WO2010048843A1 - Method, management entity and system for paging control in network reselection - Google Patents

Abstract

A method, management entity and system for paging control in network reselection are provided in the present invention, which relates to a wireless communication system, and which solves the problem that, in current communication systems, network reselection occurring on a mobile terminal in idle state may result in data loss of the mobile terminal on its source network. In the embodiments of the present invention, after a mobile terminal reselects to a target network, the mobility management entity of the target network transmits a reselection notification to the mobility management entity of the source network, which enables the mobility management entity of the source network to instruct the data forwarding entity of the source network to forward the downlink data of the mobile terminal to the data forwarding entity of the target network. In this way, the mobile terminal can acquire downlink data in the target network. The embodiments of the present invention apply to various wireless communication systems.

Description

 Paging control method, management entity and system for network reselection This application claims to be submitted to the China Intellectual Property Office on October 28, 2008, the application number is 200810172061.0, and the invention name is "network reselection paging control method, entity and system" The priority of the Chinese Patent Application is incorporated herein by reference in its entirety. Technical field

 The present invention relates to a wireless communication system, and more particularly to a paging control method, a management entity and a system in network reselection when a network reselection occurs at a terminal. Background technique

 When the mobile terminal is just turned on or moved to a new service area, the mobile terminal initiates a network discovery process and uses the mobile terminal's current service area as the access network of the mobile terminal. Due to the mobility of the mobile terminal, the service area where the mobile terminal is located may change, and when the mobile terminal changes in the service area, network reselection is required, and a new access network is selected, so that the mobile terminal is located. After the service area changes, the network can still be connected to the network. The network accessed by the mobile terminal before the reselection can be called the source network. After the reselection, the new network accessed by the mobile terminal can be called the target network.

 In the mobile scenario of broadband wireless access, the mobile terminal is required to move between different access networks, and the mobile terminal is required to be reselected by the network, so that the mobile terminal can maintain service continuity in the new access network.

 In the above application scenario, the network reselection caused by the mobile between different service areas in the same type of access network of the mobile terminal, and the network reselection generated by the mobile terminal moving between different types of access networks are included.

When the mobile terminal performs network reselection in an idle state, the source network may have downlink data to be sent to the mobile terminal, but at this time, the terminal has reselected to the target network, and the source network cannot page to this. After the mobile terminal is paged for a specified period of time, the data is discarded by the source network, causing data loss and causing waste of resources of the source network.

 For example: Before the mobile terminal reselects to the target network and accesses the network anchor through the target network (eg, Packet Data Network Gateway (PDN GW)), if the network anchor receives the source network and sends it to the mobile The downlink data of the terminal, the network anchor sends the received downlink data to the source network cache, and the source network initiates paging for the user, and at this time, the mobile terminal network reselection is completed, so that the source network continuously moves to the source network. The terminal initiates paging until the source network timer expires, stops paging, and discards the downlink data that needs to be sent to the mobile terminal. The source network continuously initiates paging, which also causes waste of resources of the source network.

 Another example: When the mobile terminal needs to perform network reselection, if the network anchor receives the downlink data sent to the mobile terminal, the network anchor sends the received downlink data to the source network cache, and the source network initiates the The paging of the user, although the mobile terminal receives the paging request of the source network, does not initiate the service request process to the source network, but continues the network reselection process. At this time, the mobile terminal cannot receive the downlink data through the source network. The source network continues to initiate paging to the mobile terminal, until the source network timer expires, the paging is stopped, and the downlink data that needs to be sent to the mobile terminal is discarded, and the source network continuously initiates paging, which also causes the source network to Waste of resources.

 Therefore, when the mobile terminal performs network reselection in an idle state, the source network may have downlink data to be sent to the mobile terminal, but at this time, the terminal has reselected to the target network, and the source network cannot page to the mobile terminal. After paging for a specified period of time, the data is discarded by the source network, causing data loss, which affects the quality of the communication.

Summary of the invention

 Embodiments of the present invention provide a paging control method, a management entity, and a system for network reselection. If a mobile terminal performs network reselection in an idle state, the communication quality is improved. The technical solution of the embodiment of the present invention can be as follows.

A paging control method for network reselection, including: Receiving a network reselection notification sent by the target network mobility management entity;

 If the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal, the source network data forwarding entity is instructed to forward the downlink data to the target network data forwarding entity.

 A paging control method for network reselection, including:

 Sending a network reselection notification to the source network mobility management entity;

 Receiving a network reselection response message sent by the source network mobility management entity;

 If the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal, a bearer resource allocation message is sent to the mobile terminal.

 A mobility management entity, including:

 a receiving unit, configured to receive a network reselection notification sent by the target network mobility management entity, where the control unit is configured to: when the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal, indicating that the source network data forwarding entity The downlink data is forwarded to the target network data forwarding entity.

 A mobility management entity, including:

 a sending unit, configured to send a network reselection notification to the source network mobility management entity;

 The receiving unit is configured to receive a network reselection response message sent by the source network mobility management entity, and send a bearer resource allocation message to the mobile terminal.

 A network reselection paging control system includes:

 a target network mobility management entity, configured to send a network reselection notification to the source network mobility management entity;

 a source network mobility management entity, configured to receive a network reselection notification sent by the target network mobility management entity; when the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal, indicating that the source network data forwarding entity The downlink data is forwarded to the target network data forwarding entity.

The paging control method, management entity and system for network reselection provided by the embodiment of the present invention, after the mobile terminal completes network reselection, that is, after reselecting from the source network to the target network, the target network mobility The management entity sends a reselection notification to the source network. If the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal, the source network data forwarding entity forwards the downlink data to the target network data forwarding entity. In this way, the mobile terminal can also receive the downlink data in the target network after reselecting to the target network, thereby improving communication quality. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in FIG. Further drawings can also be obtained from these drawings. Schematic diagram of the process; schematic diagram of the process;

 3 is a schematic structural diagram of a source network mobility management entity according to another embodiment of the present invention; FIG. 4 is a schematic structural diagram of a target network mobility management entity according to another embodiment of the present invention; A schematic structural diagram of a paging control system according to an embodiment;

 FIG. 6 is a schematic flowchart diagram of a paging control method according to another embodiment of the present invention; FIG.

 FIG. 7 is a schematic flowchart of another paging control method according to another embodiment of the present invention; FIG. 8 is a schematic flowchart of another paging control method according to another embodiment of the present invention; FIG. FIG. 10 is a schematic flowchart of another paging control method according to another embodiment of the present invention; FIG. 11 is another source network mobile according to another embodiment of the present invention; Schematic diagram of the structure of the sexual management entity;

FIG. 12 is a schematic structural diagram of another target network mobility management entity according to another embodiment of the present invention; FIG. Figure 13 is a block diagram showing another paging control system according to another embodiment of the present invention. detailed description

 In the following description, for purposes of illustration and description, reference reference However, well-known devices, circuits, and methods are omitted in the description of the present invention in order to avoid obscuring the description of the present invention.

 In various communication systems, such as Wideband Code Division Multiple Access (WCDMA), General Packet Radio Service (GPRS), Long Term Evolution (LTE), etc. Mobile Terminal (Mobile Terminal), also known as Mobile User Equipment (UE), mobile user equipment, etc., can be carried out via a radio access network (eg, RAN, Radio Access Network) and one or more core networks. Communication, the mobile terminal may be a mobile station, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal, for example, a portable, pocket, handheld, computer built-in or vehicle-mounted mobile device, Exchange language and/or data with the wireless access network.

 The geographical area covered by the Radio Access Network (RAN) is divided into a number of cells, each of which is served by a base station (e.g., NodeB, BS (Base Station)). The base station communicates with mobile terminals within the base station over an air interface (e.g., radio frequency). In the radio access network, a number of base stations are typically connected (e.g., by landline or microwave) to a Radio Network Controller (RNC). The radio network controller, sometimes referred to as a Base Station Controller (BSC), monitors and coordinates various communication activities of the connected one or more base stations. The radio network controller is typically connected to one or more core networks.

An example of a radio access network is a Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (UTRAN), and another example is GPRS EDGE (Enhanced Data Rates for GSM Evolution, GSM Evolution Enhanced Data Rate) Radio Access Network (GERAN, GSM EDGE Radio Access Network).

 When the mobile terminal changes in the service area, it needs to perform network reselection and select a new access network. When the mobile terminal performs network reselection in the idle state, the source network may have downlink data to be sent to the mobile terminal, so that the mobile terminal can receive the downlink data in the target network after reselecting to the target network, The data is not lost and the communication quality is improved. The present invention provides the following embodiments.

 In order to improve the communication quality, for example, to ensure that the source network data is not lost, in the case that the mobile terminal performs network reselection, the embodiment provides a paging control method for network reselection. As shown in FIG. 1, the method includes the following steps. step.

 101. After the mobile terminal reselects from the source network to the target network, the source network mobility management entity receives a network reselection notification from the target network mobility management entity, where the network reselection notification may be used to notify the source network mobility management entity. The mobile terminal has completed network reselection.

 102. If the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal, the source network mobility management entity instructs the source network data forwarding entity to forward the downlink data to the target network data forwarding entity.

 In another embodiment of the present invention, the source network data forwarding entity may forward the downlink data directly to the target network data forwarding entity without forwarding through the base station.

 The paging control method for network reselection provided by the embodiment of the present invention, after the mobile terminal completes network reselection, that is, after reselecting from the source network to the target network, the target network mobility management entity sends a message to the source network mobility management entity. Re-election notice. After receiving the reselection notification, the source network mobility management entity determines whether the source network data forwarding entity receives downlink data for the user. If so, the source network mobility management entity instructs the source network data forwarding entity to send downlink data currently destined for the mobile terminal to the target network data forwarding entity.

Therefore, when the mobile terminal performs network reselection in an idle state, even if the source network currently has downlink data to be transmitted to the mobile terminal and the mobile terminal reselects to the target network, the mobile terminal is still The downlink data can be obtained because the downlink data of the source network that needs to be sent to the mobile terminal has been sent to the target network, so that the mobile terminal can receive the downlink data in the target network after reselecting to the target network. , to ensure that data will not be lost, improve the quality of communication.

 In order to cooperate with the network reselection paging control method described in the foregoing embodiment of FIG. 1, another embodiment of the present invention provides a paging control method for network reselection performed by a target network mobility management entity, as shown in FIG. 2, The method includes the following steps.

 201. After the mobile terminal reselects from the source network to the target network, the target network mobility management entity sends a network reselection notification to the source network mobility management entity to notify the source network mobility management entity that the mobile terminal has completed the network weight selected.

 202. The target network mobility management entity receives a network reselection response message sent by the source network mobility management entity.

 203. If the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal, the target network mobility management entity sends a bearer resource allocation message to the mobile terminal, so that the target network data forwarding entity can use the allocated bearer resource. The corresponding data is sent to the mobile terminal.

 Therefore, when the mobile terminal performs network reselection in an idle state, even if the source network currently has downlink data to be sent to the mobile terminal and the mobile terminal reselects to the target network, the mobile terminal can still obtain the downlink data, so that It can guarantee that data will not be lost and improve communication quality.

 Corresponding to the paging control method of the network reselection described in the embodiment of FIG. 1, the embodiment further provides a mobility management entity, which is a source network mobility management entity, as shown in FIG. The source network mobility management entity includes: a receiving unit 31 and a control unit 32.

 After the mobile terminal reselects from the source network to the target network, the source network mobility management entity needs to perform the following operations.

The receiving unit 31 is configured to receive a network reselection notification sent by the target network mobility management entity, where the network reselection notification is used to notify the source network mobility management entity that the mobile terminal has completed network reselection; The entity has downlink data that needs to be sent to the mobile terminal. The control unit 32 is configured to instruct the source network data forwarding entity to forward the downlink data to the target network data forwarding entity.

 Corresponding to the paging control method of the network reselection described in FIG. 2, the embodiment further provides a mobility management entity, where the mobility management entity is a target network mobility management entity, as shown in FIG. The target network mobility management entity includes: a transmitting unit 41 and a receiving unit 42.

 After the mobile terminal reselects from the source network to the target network, the target network mobility management entity needs to perform the following operations.

 The sending unit 41 is configured to send a network reselection notification to the source network mobility management entity, to notify the source network mobility management entity that the mobile terminal has been reselected to the target network; and the receiving unit 42 is configured to receive the source network mobility. a network reselection response message sent by the management entity; when the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal, the sending unit 41 is further configured to send a bearer resource allocation message to the mobile terminal, so that the target network The data forwarding entity can forward the corresponding data to the mobile terminal through the allocated bearer resources.

 Applying the foregoing target network mobility management entity and the source network mobility management entity to the wireless communication system, the paging of the mobile terminal in the network reselection can be controlled. Therefore, the embodiment further provides a network reselection. The paging control system, as shown in FIG. 5, includes: a target network mobility management entity 51 and a source network mobility management entity 52.

 The target network mobility management entity 51 is configured to send a network reselection notification to the source network mobility management entity 52 after the mobile terminal completes the network reselection; the source network mobility management entity 52 is configured to receive the target network mobility management entity. The network re-selection notification sent by the source network forwarding entity is further used to indicate that the source network data forwarding entity forwards the downlink data to the target when the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal. Network data forwarding entity.

The paging control method, entity and system for network reselection provided by this embodiment, after the mobile terminal completes network reselection, that is, after reselecting from the source network to the target network, the target network mobility management entity moves to the source network mobility management. The entity sends a reselection notification. The source network mobility management entity is receiving After the reselection notification, the source network data forwarding entity needs to be instructed to send the downlink data that needs to be sent to the mobile terminal to the target network data forwarding entity. When the mobile terminal performs network reselection in an idle state, even if the source network has downlink data that needs to be sent to the mobile terminal and the mobile terminal reselects to the target network, the mobile terminal can still obtain the downlink data, because in this implementation In the example, the downlink data that needs to be sent to the mobile terminal in the source network is backed up in the target network, so that the mobile terminal can still receive the downlink data in the target network after reselecting to the target network, so as to ensure that the data is not lost.

 Another non-limiting embodiment of the present invention is an LTE communication system in which a mobile terminal reselects from an E-UTRAN (Evolved-Universal Terrestrial Radio Access Network) network to HRPD (High Rate Packed Data, high speed) Data packet) The process of the network, and the mobile terminal is in an idle state when reselection is performed.

The data forwarding entity in the E-UTRAN network is the S-GW (Serving Gateway), the mobility management entity in the HRPD network is the HRPD AN (Access Node), and the data forwarding entity in the HRPD network is the HSGW. (HRPD SGW, HRPD Service Gateway).

 As shown in FIG. 6, the process of network reselection in this embodiment includes the following steps.

 The mobile terminal is idle in the E-UTRAN network before the mobile terminal initiates network reselection.

 602. The mobile terminal determines to reselect to the HRPD network according to the current environmental parameter.

 For example: The signal coverage quality of the E-UTRAN network is not as good as the signal coverage quality of the HRPD network, and the mobile terminal can decide to reselect to the HRPD network according to the environmental parameters of the signal coverage quality.

 603. The mobile terminal initiates an HRPD connection establishment request to the HRPD AN.

 For example, the HRPD connection establishment request can be HRPD Connect Request

604. After receiving the HRPD connection establishment request, the HRPD AN performs signaling interaction with the HSGW to obtain information such as an address of the HSGW establishing a data forwarding channel and a GRE Key (general routing encapsulation key). 605. The HRPD AN sends a network reselection notification to the MME to notify the MME that the HRPD network has been reselected.

 606. The MME determines whether there is downlink data that needs to be sent to the mobile terminal in the E-UTRAN network.

 If the E-UTRAN network has downlink data that needs to be sent to the mobile terminal, step 607 is performed; if there is no downlink data that needs to be sent to the mobile terminal, step 609 is performed.

 607. The MME sends a request for establishing a data forwarding channel to the S-GW, to instruct the S-GW to establish a data forwarding channel with the HSGW. Then step 608 is performed.

 Since there is downlink data currently required to be sent to the mobile terminal in the E-UTRAN network, downlink data sent to the mobile terminal may exist on the S-GW, and the downlink data may pass through the data forwarding channel. Directly forwarded to the HSGW, it is no longer necessary to transit through the base station, so that after the mobile terminal reselects to the HRPD network, the downlink data forwarded in the E-UTRAN network can still be received, and the downlink data is not lost.

 At the same time, in this step, the MME stops paging for the mobile terminal, so that the MME can be prevented from directly paging until the timer expires, and the network resources are wasted.

 For example, the MME may send a specific message to the S-GW (such as the establishment request of the data forwarding channel in this embodiment) to instruct the S-GW to forward the downlink data to the HSGW; of course, the MME may send the message to the S-GW. The specific parameter is carried in to indicate that the S-GW forwards the downlink data to the HSGW.

 608. After completing the establishment of the data forwarding channel between the S-GW and the HSGW, the S-GW sends a data forwarding channel setup response to the MME, and then performs step 609.

 609. The MME returns a network reselection response message to the HRPD AN.

 An indication message may be carried in the response message to indicate whether there is downlink data currently required to be sent to the mobile terminal in the E-UTRAN network. The HRPD AN is enabled to know whether there is downlink data currently required to be transmitted to the mobile terminal in the E-UTRAN network.

For example, in this step, if the result of the determination in step 606 is that the current need to be sent to The downlink data of the mobile terminal indicates that there is downlink data currently needed to be sent to the mobile terminal in the E-UTRAN network; if the result of the determination in step 606 is that there is no downlink data currently required to be sent to the mobile terminal, the indication message Indicates that there is no downlink data currently required to be transmitted to the mobile terminal in the E-UTRAN network. The indication message can generally be distinguished by a binary 0 or 1. For example, 0 means that there is no downlink data that needs to be sent to the mobile terminal, and 1 means that there is downlink data that needs to be sent to the mobile terminal, and vice versa.

 610. The HRPD AN switches the data transmission path of the mobile terminal to the HRPD network, so that the mobile terminal can obtain downlink data from the reselected HRPD network.

 611. The HRPD AN determines, according to the indication message in the network reselection response message, whether there is downlink data that needs to be sent to the mobile terminal in the E-UTRAN network, and if there is no downlink data that needs to be sent to the mobile terminal, execute After step 612, step 612 is performed directly; if there is downlink data that needs to be sent to the mobile terminal, the HRPD AN needs to determine whether the connection establishment request in step 603 includes all parameters for allocating network resources, and the network in this embodiment The resource is the transmission channel. If all the parameters are included, the allocation of the transmission channel is performed, and steps 612, 613, 614, and 615 are performed, otherwise all the parameters described above need to be requested again from the mobile terminal, and no all parameters of the network resource are allocated. Referring to the specific description in the embodiment of Fig. 8, it is assumed in the embodiment that the above connection establishment request includes all the parameters described.

 After this step, in the case where the allocation of the transmission channel can be performed, steps 613, 614, and 615 can be directly performed without performing step 612.

 612. The HRPD AN sends a connection establishment response to the mobile terminal.

 613. The HRPD AN sends an allocation message of the transmission channel to the mobile terminal to notify the mobile terminal of the allocation of the transmission channel, so that the mobile terminal can communicate by using the allocated transmission channel.

 614. The mobile terminal returns a transmission channel allocation complete message to the HRPD AN, so that the mobile terminal transitions from an idle state to an active state to receive downlink data in the HRPD network.

615. A PDN GW (Packet Data Gateway) initiates the mobile terminal in an E-UTRAN network. Release process of access resources.

 In the above process, if the mobile terminal completes the reception of the downlink data, it needs to return to the idle state again, and the mobile terminal actively initiates a connection release process of the HRPD network.

 In this embodiment, if the mobile terminal is in an idle state in the E-UTRAN network and reselected into the HRPD network, the HRPD AN sends a network reselection notification to the MME, and after receiving the network reselection notification, the MME receives the network reselection notification. First, it is determined whether there is downlink data currently required to be sent to the mobile terminal in the E-UTRAN network. If there is corresponding downlink data, the S-GW in this embodiment needs to forward the downlink data to the HSGW, so even if the mobile The terminal has been reselected into the HRPD network, and at this time, the original E-UTRAN network has downlink data that needs to be sent to the mobile terminal, and the mobile terminal can still receive the downlink data through the HRPD network, thereby avoiding data loss. Moreover, the MME does not initiate paging to the mobile terminal, which reduces the waste of resources of the E-UTRAN network.

 In the step 606 of the embodiment, if there is no downlink that needs to be sent to the mobile terminal, the following steps may be performed: A, A2, and then step 609 is performed:

 The MME sends an establishment request of the data forwarding channel to the S-GW to instruct the S-GW to establish a data forwarding channel with the HSGW.

 A2: After completing the establishment of the data forwarding channel between the S-GW and the HSGW, the S-GW sends a data forwarding channel setup response to the MME.

 In another embodiment of the present invention, the MME may further carry a specific parameter in the message sent to the S-GW to instruct the S-GW to establish a data forwarding channel with the HSGW.

By establishing a data forwarding channel between the S-GW and the HSGW, even when the MME makes a judgment, there is no downlink data currently required to be sent to the mobile terminal in the E-UTRAN network, after the judgment is completed and the mobile terminal is in the E- If the access resources in the UTRAN network are not yet released, the S-GW in the E-UTRAN network receives the downlink data that needs to be sent to the mobile terminal, and the S-GW can still forward the downlink data through the established data. The channel is directly forwarded to the HSGW, so that the mobile terminal can receive the downlink data through the reselected HRPD network, The certificate data will not be lost.

 In another embodiment of the present invention, the application scenario is: a process in which a mobile terminal reselects from an E-UTRAN (Evolved Universal Terrestrial Radio Access Network) network to a HRPD (High Rate Packed Data) network, and The mobile terminal is idle during the reselection.

 As shown in FIG. 7, the MME in this embodiment is a mobility management entity in an E-UTRAN network, and the S-GW (Serving Gateway) is a data forwarding entity in an E-UTRAN network, and HRPD AN (Access Node The access point is a mobility management entity in the HRPD network, and the HSGW (HRPD SGW, HRPD Service Gateway) is a data forwarding entity in the HRPD network.

 As shown in FIG. 7, the process of network reselection in this embodiment includes the following steps.

 The mobile terminal is idle in the E-UTRAN network.

 702. The mobile terminal determines to reselect to the HRPD network according to the current environmental parameter.

 For example: If the signal coverage quality of the E-UTRAN network is not as good as the signal coverage quality of the HRPD network, the mobile terminal will decide to reselect to the HRPD network according to the environmental parameters of the signal coverage quality.

 703. The mobile terminal sends a network reselection indication (Inter-RAT) to the HRPD AN.

 704. After receiving the network reselection indication, the HRPD AN performs signaling interaction with the HSGW to obtain information such as an address of the HSGW establishing a data forwarding channel and a GRE Key (general routing encapsulation key).

 705. The HRPD AN sends a network reselection notification to the MME to notify the MME that the HRPD network has been reselected.

 706. The MME determines whether there is downlink data that needs to be sent to the mobile terminal in the E-UTRAN network. If there is downlink data that needs to be sent to the mobile terminal, go to step 707. If there is no downlink that needs to be sent to the mobile terminal. Data, then step 709 is performed.

 707. The MME sends a request for establishing a data forwarding channel to the S-GW, to instruct the S-GW to establish a data forwarding channel with the HSGW.

For example, if there is downlink data currently required to be sent to the mobile terminal in the E-UTRAN network, the downlink data may be directly forwarded to the HSGW through the data forwarding channel, no longer After the mobile terminal is reselected to the HRPD network, the HRPD network can still receive the downlink data that the E-UTRAN network needs to send to the mobile terminal, ensuring that the downlink data is not lost.

 In another embodiment of the present invention, the MME may stop initiating paging to the mobile terminal, so that the MME may be prevented from paging to the mobile terminal until the timer expires, thereby reducing network resource waste of the MME.

 In another embodiment of the present invention, the MME may send a specific message to the S-GW (such as the establishment request of the data forwarding channel in this embodiment) to instruct the S-GW to forward the downlink data to the HSGW; The message sent to the S-GW carries a specific parameter to instruct the S-GW to forward the downlink data to the HSGW.

 708. After completing the establishment of the data forwarding channel between the S-GW and the HSGW, the S-GW sends a data forwarding channel setup response to the MME.

 709. The MME returns a network reselection response message to the HRPD AN, where the response message may carry an indication message to indicate whether there is downlink data currently needed to be sent to the mobile terminal in the E-UTRAN network. The HRPD AN is enabled to know whether there is downlink data currently required to be sent to the mobile terminal in the E-UTRAN network.

 In another embodiment of the present invention, if the result of the determination in step 706 is that there is downlink data that needs to be sent to the mobile terminal, the indication message indicates that there is downlink data currently needed to be sent to the mobile terminal in the E-UTRAN network; If the result of the determination in step 706 is that there is no current paging for the mobile terminal, the indication message indicates that there is no downlink data currently required to be transmitted to the mobile terminal in the E-UTRAN network. The indication message can generally be distinguished by a binary 0 or 1. For example, 0 means that there is no downlink data that needs to be sent to the mobile terminal, and 1 means that there is downlink data that needs to be sent to the mobile terminal, and vice versa.

 710. The HRPD AN switches the data transmission path of the mobile terminal to the HRPD network, so that the mobile terminal can obtain downlink data from the reselected HRPD network.

711. The HRPD AN determines that the indication message in the network reselection response message is If there is no downlink data that needs to be sent to the mobile terminal in the E-UTRAN network, if there is no downlink data that needs to be sent to the mobile terminal, step 715 is performed directly after performing step 712; if there is currently a need to send to the mobile terminal For the downlink data, the HRPD AN needs to determine whether the network reselection indication in step 703 includes all the parameters of the allocated network resource. The network resource in this embodiment is the transmission channel. If all the parameters are included, the allocation of the transmission channel is performed, and steps 712, 713, 714, and 715 are performed. Otherwise, all the parameters are required to be requested again from the mobile terminal. In this embodiment, the network reselection indication is assumed. All the parameters described are included.

 After this step, in the case where the allocation of the transmission channel can be performed, steps 713, 714, and 715 can also be directly performed without performing step 712.

 712. The HRPD AN sends a reselection indication response to the mobile terminal.

 713. The HRPD AN sends an allocation message of the transmission channel to the mobile terminal to inform the mobile terminal of the allocation of the transmission channel, so that the mobile terminal can communicate by using the allocated transmission channel.

 714. The mobile terminal returns a transmission channel allocation complete message to the HRPD AN, so that the mobile terminal transitions from an idle state to an active state to receive downlink data in the HRPD network.

 715. The PDN GW (Packet Data Gateway) initiates a release process of the access resource of the mobile terminal in the E-UTRAN network.

 In the above process, if the mobile terminal completes the reception of the downlink data, it needs to return to the idle state again, and the mobile terminal actively initiates a connection release process of the HRPD network.

In this embodiment, if the mobile terminal is in an idle state in the E-UTRAN network and reselected into the HRPD network, the HRPD AN sends a network reselection notification to the MME, and after receiving the network reselection notification, the MME receives the network reselection notification. First, it is determined whether there is downlink data currently required to be sent to the mobile terminal in the E-UTRAN network. If there is corresponding downlink data, the S-GW in this embodiment needs to forward the downlink data to the HSGW, so even if the mobile The terminal has been reselected into the HRPD network and there is downlink data currently needed to be sent to the mobile terminal in the E-UTRAN network, and the mobile terminal can still receive the original E-UTRAN network to be sent to the mobile through the HRPD network. Downstream data of the terminal, thus avoiding data loss. Moreover, the MME does not page to the mobile terminal any more, which reduces the waste of resources of the E-UTRAN network.

 4. In step 703, the mobile terminal sends a network reselection indication to the HRPD AN to carry an identification message indicating that the current mobile terminal has received the paging of the source network, then in step 711.

The HRPD AN may further determine, based on the identification message, whether there is downlink data currently required to be transmitted to the mobile terminal in the E-UTRAN network.

 The application scenario of the other embodiment is similar to the application scenario of the embodiment of FIG. 7. Specifically, as shown in FIG. 8, the process of network reselection in this embodiment includes the following steps.

 The mobile terminal is idle in the E-UTRAN network.

 802. The mobile terminal determines to reselect to the HRPD network according to current environmental parameters.

 For example: If the signal coverage quality of the E-UTRAN network is not as good as the signal coverage quality of the HRPD network, the mobile terminal will decide to reselect to the HRPD network according to the environmental parameters of the signal coverage quality.

 803. The mobile terminal sends a network reselection indication (Inter-RAT) to the HRPD AN, where the reselection indication does not include all parameters required for allocating network resources, such as signal power and the like.

 804. After receiving the network reselection indication, the HRPD AN performs signaling interaction with the HSGW to obtain information such as an address of the HSGW establishing a data forwarding channel and a GRE Key (general routing encapsulation key).

 805. The HRPD AN sends a network reselection notification to the MME to notify the MME that the HRPD network has been reselected.

 806. The MME determines whether there is downlink data that needs to be sent to the mobile terminal in the E-UTRAN network. If there is downlink data that needs to be sent to the mobile terminal, go to step 807; if there is no downlink that needs to be sent to the mobile terminal. Data, then step 809 is performed.

 807. The MME sends a request for establishing a data forwarding channel to the S-GW, to instruct the S-GW to establish a data forwarding channel with the HSGW.

Since there is downlink data currently required to be sent to the mobile terminal in the E-UTRAN network, downlink data sent to the mobile terminal may exist on the S-GW, and the downlink data may pass. The data forwarding channel is forwarded directly to the HSGW, and no longer needs to be transited by the base station, so that the mobile terminal reselects to the HRPD network and the E-UTRAN network has downlink data that needs to be sent to the mobile terminal, and the mobile terminal remains The downlink data can be received through the E-UTRAN network, ensuring that downlink data is not lost.

 In another embodiment of the present invention, the MME may stop paging to the mobile terminal, so that the MME may be prevented from paging to the mobile terminal until the timer expires, thereby reducing network resource waste of the MME.

 808. After completing the establishment of the data forwarding channel between the S-GW and the HSGW, the S-GW sends a data forwarding channel setup response to the MME.

 809. The MME returns a network reselection response message to the HRPD AN, where the response message may carry an indication message to indicate whether there is downlink data currently needed to be sent to the mobile terminal in the E-UTRAN network. The HRPD AN is enabled to know whether there is downlink data currently required to be sent to the mobile terminal in the E-UTRAN network.

 In this step, the specific indication message is implemented in the same manner as in the embodiment of FIG. 6 or FIG. 7.

 810. The HRPD AN switches the data transmission path of the mobile terminal to the HRPD network, so that the mobile terminal can obtain downlink data from the reselected HRPD network.

 811. The HRPD AN determines, according to the indication message in the network reselection response message, whether there is downlink data that needs to be sent to the mobile terminal in the E-UTRAN network, and if there is no downlink data that needs to be sent to the mobile terminal, After performing step 812, step 816 is performed directly; if there is downlink data that needs to be sent to the mobile terminal, the HRPD AN needs to determine whether the network reselection indication in step 803 includes all the parameters of the allocated network resource, in this embodiment. The network resource is the transmission channel. Since all the parameters are not included in the network reselection indication in this embodiment, steps 812, 813, 814, 815, and 816 are performed.

812. The HRPD AN sends a reselection indication response to the mobile terminal, where the response includes an activation indication to request all parameters from the mobile terminal. 813. The mobile terminal sends a connection establishment request to the HRPD AN, where the request carries all parameters of the allocated network resource.

 814. The HRPD AN performs allocation of a transmission channel, where the transmission channel is a network resource, and the HRPD AN sends an allocation message of the transmission channel to the mobile terminal to notify the mobile terminal of the allocation of the transmission channel, so that the mobile terminal can utilize the allocation. The transmission channel communicates.

 815. The mobile terminal returns a transmission channel allocation complete message to the HRPD AN, so that the mobile terminal transitions from an idle state to an active state to receive downlink data in the HRPD network.

 816. The PDN GW (Packet Data Gateway) initiates a release process of the access resources of the mobile terminal in the E-UTRAN network.

 In the above process, if the mobile terminal completes the reception of the downlink data, it needs to return to the idle state again, and the mobile terminal actively initiates a connection release process of the HRPD network.

 In this embodiment, if the mobile terminal is in an idle state in the E-UTRAN network and reselected into the HRPD network, the HRPD AN sends a network reselection notification to the MME, and after receiving the network reselection notification, the MME receives the network reselection notification. First, it is determined whether there is downlink data currently required to be sent to the mobile terminal in the E-UTRAN network. If there is corresponding downlink data, the S-GW in this embodiment needs to forward the downlink data to the HSGW, so even if the mobile The terminal has been reselected into the HRPD network and the downlink data exists, and the downlink data can still be received through the HRPD network, thereby avoiding data loss. Moreover, the MME does not page to the mobile terminal any more, which reduces the waste of resources of the E-UTRAN network.

 In another embodiment of the present invention, the application scenario is that the mobile terminal performs network reselection between different service areas in the 3GPP network, and the mobile terminal is in an idle state when performing reselection, which is equivalent to the tracking area of the mobile terminal. In the change, tracking area update is required, and in this embodiment, only the MME is reselected without reselecting the S-GW.

 As shown in FIG. 9, the process of network reselection in this embodiment includes the following steps.

 The mobile terminal is idle in the source network.

902. The mobile terminal determines to reselect to the target network according to the current environmental parameter. 903. The mobile terminal sends a tracking area update request message to the target MME of the target network.

904. The target MME determines that the source network Serving GW can continue to provide services for the mobile terminal, and the target MME sends a network reselection notification message to the source MME to notify the source MME that the mobile terminal has completed network reselection.

 905. The source MME determines whether there is downlink data that needs to be sent to the mobile terminal in the source network. If there is downlink data that needs to be sent to the mobile terminal, step 906 is performed; if there is no downlink data that needs to be sent to the mobile terminal. Then, step 907 is performed.

 906. The source MME stops paging to the mobile terminal, so that the MMW can be prevented from paging the mobile terminal in the source network until the timer expires, thereby reducing resource waste of the source network.

 907. The source MME sends an indication message to the S-GW, to indicate that the S-GW does not send downlink data to the base station of the source network, but caches the downlink data.

 908. The S-GW returns a response message of the indication message to the source MME.

 909. The source MME returns a network reselection response message to the target MME, and carries the indication information in the response message to notify the target MME whether there is currently downlink data that needs to be sent to the mobile terminal in the source network.

 910. The target MME controls a mobile terminal to establish a bearer in the target network.

 911. The indication information in the target MME determining step 909 indicates whether the source network currently has downlink data that needs to be sent to the mobile terminal. If the source network currently has downlink data that needs to be sent to the mobile terminal, step 913 is performed; otherwise, the step is performed. 912.

 912. The target MME returns a 3 track area update response to the mobile terminal.

913. The target MME initiates a radio bearer setup process, and configures required radio bearer resources. In this embodiment, if the mobile terminal is in an idle state in the source network and reselected to the target network, the target MME sends a network reselection notification to the source MME, and after the source MME receives the network reselection notification, First, it is determined whether there is downlink data currently required to be sent to the mobile terminal in the source network. If there is corresponding downlink data, the target network in this embodiment needs to establish a radio bearer, so that the mobile terminal receives the downlink in the target network. Data, data is guaranteed Will not be lost.

 In another embodiment of the present invention, the application scenario is that the mobile terminal performs network reselection between different service areas in the 3GPP network, and the mobile terminal is in an idle state when performing reselection, which is equivalent to the tracking area of the mobile terminal. The change requires a tracking area update, and the MME and the S-GW are simultaneously reselected in this embodiment.

 As shown in FIG. 10, the process of network reselection in this embodiment includes the following steps.

 The mobile terminal is idle in the source network.

 1002: The mobile terminal determines to reselect to the target network according to the current environmental parameter.

 1003. The mobile terminal sends a tracking area update request message to the target MME of the target network.

1004. The target MME determines that a new Serving GW (target S-GW) needs to be selected to provide services for the mobile terminal.

 For example, in this step, the target MME sends a bearer setup request message to the target S-GW to configure parameters required for data transmission, such as: obtaining the address of the target S-GW and the tunnel ID.

 1005. The target S-GW returns a 7-set setup response message to the target MME.

 1006. The target MME sends a network reselection notification message to the source MME to notify the source MME that the mobile terminal has completed network reselection. In another embodiment of the present invention, the reselection notification may carry configuration information for data transmission.

 1007: The source MME determines whether there is downlink data that needs to be sent to the mobile terminal in the source network. If there is downlink data that needs to be sent to the mobile terminal, go to step 1008. If there is no downlink data that needs to be sent to the mobile terminal. Then, step 1010 is performed. In this step, if there is no downlink data currently required to be sent to the mobile terminal in the source network, step 1008 and 1009 may be performed before step 1010.

 1008. The source MME sends a data forwarding channel setup request to the source S-GW to indicate that the source S-GW establishes a data forwarding channel with the target S-GW.

Since there is downlink data currently required to be sent to the mobile terminal in the source network, downlink data sent to the mobile terminal may exist on the source S-GW, and the downlink data may pass through The data forwarding channel is forwarded directly to the target S-GW, and no longer needs to be transited by the base station, so that after the mobile terminal reselects to the target network, the target network can still receive the current network to be sent to the mobile terminal. Downstream data ensures that downlink data is not lost.

 In another embodiment of the present invention, the source MME may stop initiating a paging to the mobile terminal, so that the source MME may be prevented from paging to the mobile terminal until the timer expires, thereby reducing network resource waste of the source MME.

 1009. After completing the establishment of the data forwarding channel between the source S-GW and the target S-GW, the source S-GW sends a data forwarding channel setup response to the source MME.

 1010. The source MME returns a network reselection response message to the target MME.

 For example, the response message may carry an indication message to indicate whether there is downlink data currently needed to be sent to the mobile terminal in the source network. The target MME is enabled to know whether there is downlink data currently needed to be sent to the mobile terminal in the source network.

 1011. The target MME switches the data transmission path of the mobile terminal to the target network, so that the mobile terminal can acquire downlink data from the reselected network.

 1012. The target MME determines, according to the indication message in the network reselection response message, whether there is downlink data that needs to be sent to the mobile terminal in the source network. If there is no downlink data that needs to be sent to the mobile terminal, step 1013 is performed. If there is downlink data that needs to be sent to the mobile terminal, step 1014 is performed.

 1013. The target MME sends a tracking area update response to the mobile terminal to complete the entire tracking area update process.

1014. The target MME initiates a radio bearer setup process, and configures required radio bearer resources. In this embodiment, if the mobile terminal is in an idle state in the source network and reselected to the target network, the target MME sends a network reselection notification to the source MME, and after the source MME receives the network reselection notification, First, it is determined whether there is downlink data currently required to be sent to the mobile terminal in the source network. If there is corresponding downlink data, the target network in this embodiment needs to establish the radio bearer, so that the mobile terminal receives the source in the target network. The network currently needs to be sent to The downlink data of the mobile terminal ensures that the downlink data is not lost. Moreover, the source MME will not page to the mobile terminal again, which reduces the waste of resources of the source network.

 Another embodiment of the present invention provides a mobility management entity, which is a source network mobility management entity. As shown in FIG. 11, the source network mobility management entity includes: a receiving unit 111, determining The unit 112, the control unit 113, and the transmitting unit 114.

 After the mobile terminal reselects from the source network to the target network, the source network mobility management entity needs to perform the following operations.

 The receiving unit 111 is configured to receive a network reselection notification sent by the target network mobility management entity, where the network reselection notification is used to notify the source network mobility management entity that the mobile terminal has completed network reselection.

 The determining unit 112 is configured to determine, after the mobile terminal completes the network reselection, whether the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal.

 The control unit 113 is configured to: when the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal, the control source MME stops paging to the mobile terminal, and the control unit 113 is further configured to indicate source network data forwarding. The entity forwards the downlink data to the target network data forwarding entity.

 The control unit 113 is further configured to: when the source network data forwarding entity does not have downlink data that needs to be sent to the mobile terminal, instruct the source network data forwarding entity to establish a data forwarding channel with the target network data forwarding entity.

 The sending unit 114 is configured to send a network reselection response message to the target network mobility management entity, where the indication information in the response message indicates whether the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal.

 In this embodiment, the specific functions of the unit and the specific content of the message or the request may refer to the content described in the foregoing embodiment of FIG. 6-10, and details are not described herein again.

Another embodiment of the present invention further provides a mobility management entity, where the mobility management entity is a target network mobility management entity, as shown in FIG. 12, the target network mobility management entity package. The transmitting unit 121, the receiving unit 122, the first determining unit 123, and the second determining unit 124 are included. After the mobile terminal reselects from the source network to the target network, the target MME needs to perform the following operations.

 The sending unit 121 is configured to send a network reselection notification to the source network mobility management entity, where the network reselection notification is used to notify the source network mobility management entity that the mobile terminal has completed network reselection.

 The receiving unit 122 is configured to receive a network reselection response message sent by the source network mobility management entity.

 The first determining unit 123 is configured to determine whether the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal.

 The sending unit 121 is further configured to: when the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal, send a bearer resource allocation message to the mobile terminal, so that the target network data forwarding entity can use the allocated bearer resource. The corresponding data is forwarded to the mobile terminal.

 The receiving unit 122 is further configured to receive a connection establishment request sent by the mobile terminal.

 The second determining unit 124 is configured to: when the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal, and determine whether the connection establishment request carries all parameters required for establishing a connection.

 The sending unit 121 is further configured to send a connection establishment response to the mobile terminal when the connection establishment request does not carry all the parameters required for establishing the connection, and include an activation indication requesting the all parameters in the response.

 The receiving unit 122 is further configured to receive a connection establishment request that is sent by the mobile terminal and that carries all the parameters.

 In this embodiment, the specific functions of the unit and the specific content of the message or the request may refer to the content described in the foregoing embodiment of FIG. 6-10, and details are not described herein again.

Applying the target network mobility management entity and the source network mobility management entity in the foregoing embodiment to the wireless communication system, and capable of controlling the paging of the mobile terminal in the network reselection, In another embodiment of the present invention, a paging control system for network reselection is provided. As shown in FIG. 13, the system includes: a target network mobility management entity 131 and a source network mobility management entity 132.

 The target network mobility management entity 131 is configured to send a network reselection notification to the source network mobility management entity 132 after the mobile terminal completes the network reselection.

 The source network mobility management entity 132 is configured to receive, by the target network mobility management entity, a data forwarding entity, whether there is downlink data that needs to be sent to the mobile terminal.

 The source network mobility management entity 132 is further configured to stop initiating paging to the mobile terminal when the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal, and instruct the source network data forwarding entity to The downlink data is forwarded to the target network data forwarding entity.

 The target network mobility management entity 131 is further configured to determine whether the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal, and when the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal, The mobile terminal sends a bearer resource allocation message.

 This embodiment is mainly used in various wireless communication systems for paging control, such as: WIMAX ( Worldwide Interoperability for Microwave Access), CDMA2000 EV-DO (CDMA2000 Evolution-Data Optimized, CDMA2000 Development - Data Enhanced), IWLAN (Industrial Wireless LAN), GSM (Global System for Mobile Communications) and other networks.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus necessary general hardware, and of course, by hardware, but in many cases, the former is a better implementation. . Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a readable storage medium, such as a floppy disk of a computer. , U disk, removable hard disk, read only memory (ROM), random access memory (RAM), disk, hard disk or optical disk, etc. A variety of media that can store program code, including a number of instructions to make a computer device ( Can It is a personal computer, a server, or a network device, etc., that performs all or part of the steps of the method described in various embodiments of the present invention.

 In the several embodiments provided herein, it is to be understood that the disclosed systems, devices, and methods may be implemented in other ways without departing from the spirit and scope of the application. The present embodiments are merely exemplary, and should not be taken as limiting, and the specific details are not intended to limit the purpose of the application. For example, the division of the unit is only a logical function division, and the actual implementation may have another division manner, for example, multiple units or components may be combined or may be integrated into another system, or some features may be ignored, or not. carried out.

 The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, ie may be located One place, or it can be distributed to multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the objectives of the embodiment. Those skilled in the art can understand and implement without any creative work.

 In addition, the described systems, apparatus, and methods, as well as the schematic diagrams of various embodiments, may be combined or integrated with other systems, modules, techniques or methods without departing from the scope of the present application. In addition, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.

 The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

Claim

 A paging control method for network reselection, characterized in that:

 Receiving a network reselection notification sent by the target network mobility management entity;

 If the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal, the source network data forwarding entity is instructed to forward the downlink data to the target network data forwarding entity.

 The method for controlling the paging of the network reselection according to claim 1, wherein the method further comprises: if the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal, stopping to the mobile terminal Initiate a page.

 The method for controlling the paging of the network reselection according to claim 1, wherein before the instructing the source network data forwarding entity to forward the downlink data to the target network data forwarding entity, the method further includes:

 Determining whether the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal.

The method for controlling the paging of the network reselection according to claim 1, wherein the method further comprises:

 If the source network data forwarding entity does not have downlink data that needs to be sent to the mobile terminal, the source network data forwarding entity and the target network data forwarding entity establish a data forwarding channel.

 The method for controlling the paging of the network reselection according to claim 1, wherein the instructing the source network data forwarding entity to forward the downlink data to the target network data forwarding entity comprises: indicating the source network data forwarding entity Establishing a data forwarding channel with the target network data forwarding entity, and instructing the source network data forwarding entity to send the downlink data to the target network data forwarding entity through the established data forwarding channel.

 The paging control method for network reselection according to any one of claims 1 to 5, wherein the method further comprises:

 Sending a network reselection response message to the target network mobility management entity, where the indication information indicates whether the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal.

7. The paging control method for network reselection according to claim 1, wherein Sending a particular message or a particular parameter in the message indicates that the source network data forwarding entity forwards the downlink data to the target network data forwarding entity.

 8. The network reselection paging control method according to claim 4, wherein the source network data forwarding entity and the target network data forwarding entity establish a data forwarding channel by transmitting a specific message or a specific parameter in the message.

 9. A paging control method for network reselection, characterized in that:

 Sending a network reselection notification to the source network mobility management entity;

 Receiving a network reselection response message sent by the source network mobility management entity;

 If the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal, a bearer resource allocation message is sent to the mobile terminal.

 The paging control method of the network reselection according to claim 9, wherein before the sending the resource allocation message to the mobile terminal, the method further includes:

 Determining whether the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal.

The network reselection paging control method according to claim 9, wherein the network reselection response message includes indication information indicating whether the source network data forwarding entity currently needs to be sent to the mobile Downlink data of the terminal.

 The paging control method for network reselection according to claim 9, wherein before receiving the network reselection response message sent by the source network mobility management entity, the method further comprises: receiving the mobile terminal to send Connection establishment request;

 If the source network data forwarding entity has the downlink data that needs to be sent to the mobile terminal, the method further includes: before sending the bearer resource allocation message to the mobile terminal, the method further includes:

 Determining whether the connection establishment request carries all parameters required for establishing a connection;

 If the connection establishment request does not carry all the parameters required to establish the connection, send a connection establishment response to the mobile terminal, and include an activation indication requesting all the parameters in the response;

 Receiving a connection establishment request that is sent by the mobile terminal and carrying all the parameters.

13. The paging control method for network reselection according to claim 12, wherein: The indication information in the network reselection response message indicates whether the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal, and the indication information in the connection establishment request sent by the mobile terminal indicates whether the source network data forwarding entity is There is downlink data that needs to be sent to the mobile terminal currently.

 14. A mobility management entity, comprising:

 a receiving unit, configured to receive a network reselection notification sent by the target network mobility management entity, where the control unit is configured to: when the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal, indicating that the source network data forwarding entity The downlink data is forwarded to the target network data forwarding entity.

 The mobility management entity according to claim 14, wherein the control unit is further configured to: when the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal,

The mobility management entity according to claim 14, further comprising: a determining unit, configured to determine whether the source network data forwarding entity has downlink data that is currently required to be sent to the mobile terminal.

 The mobility management entity according to claim 14, wherein the control unit is further configured to: when the source network data forwarding entity does not have downlink data that needs to be sent to the mobile terminal, indicate that the source network data is forwarded. The entity establishes a data forwarding channel with the target network data forwarding entity.

 The mobility management entity according to any one of claims 14 to 17, further comprising:

 And a sending unit, configured to send a network reselection response message to the target network mobility management entity, where the indication information in the response message indicates whether the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal.

 19. A mobility management entity, comprising:

 a sending unit, configured to send a network reselection notification to the source network mobility management entity;

a receiving unit, configured to receive a network reselection response message sent by the source network mobility management entity; And transmitting a bearer resource allocation message to the mobile terminal.

 The mobility management entity according to claim 14, further comprising: a first determining unit, configured to determine whether the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal.

 The mobility management entity according to claim 19, wherein the receiving unit is further configured to receive a connection establishment request sent by the mobile terminal;

 The mobility management entity also includes:

 a second determining unit, configured to determine, when the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal, whether the connection establishment request carries all parameters required for establishing a connection; the sending unit is further configured to: The connection establishment request does not carry all the parameters required for establishing the connection, sends a connection establishment response to the mobile terminal, and includes an activation indication requesting all the parameters in the response;

 The receiving unit is further configured to receive a connection establishment request that is sent by the mobile terminal and that carries all the parameters.

 22. A paging control system for network reselection, comprising:

 a target network mobility management entity, configured to send a network reselection notification to the source network mobility management entity;

 a source network mobility management entity, configured to receive a network reselection notification sent by the target network mobility management entity; when the source network data forwarding entity has downlink data that needs to be sent to the mobile terminal, indicating that the source network data forwarding entity The downlink data is forwarded to the target network data forwarding entity.

 23. The network reselection paging control system according to claim 22, wherein when the downlink data is received, paging to the mobile terminal is stopped.

24. The network reselection paging control system according to claim 22, wherein When the downlink data of the mobile terminal is transmitted, a bearer resource allocation message is sent to the mobile terminal.