CN101009698A - Method, network unit and system for guaranteeing the session initialization quality in the IMS network - Google Patents

Abstract

The invention discloses a method for guaranteeing session initiation quality in an IP Multimedia Subsystem (IMS) network, comprising the following steps: a session initiation device sends a session initiation request containing priority identification information to a network unit in the network; The unit sorts the session initiation request according to the priority identification information and sends it to the session called device; the session called device responds to the session initiation request. The invention is used to improve the service quality and experience quality of users in the IMS network. At the same time, the invention also discloses the network unit and system involved in the method.

Description

Method for guaranteeing session initiation quality in IMS network, network unit and system

technical field

The invention relates to an IP Multimedia Subsystem (IMS) network, in particular to a method, a network unit and a system for guaranteeing session initiation quality in the IMS network.

Background technique

With the development of broadband networks, mobile communications will not be limited to traditional voice communications, but multimedia services that combine audio, video, pictures, text and other media types will gradually develop. By combining with data services such as presence (presentation service), short message, WEB (web page) browsing, location information, PUSH (push service), and file sharing, it can meet various needs of users.

Driven by a variety of applications, standard organizations such as 3GPP and 3GPP2 have successively introduced the IP-based multimedia subsystem (IMS) architecture, the purpose of which is to use a standardized open structure in the mobile network to achieve a variety of multimedia Applications provide users with more choices and richer experiences.

When real-time communication is carried on the IMS network, the communication initiator sends a session initiation request to the communication called party through the network, and the communication called party responds to the request. In this process, the communication initiator can be called the session initiator, A communication callee may be referred to as a session callee. Specifically in the IMS network, the two parties in the session communicate with each other through IMS signaling. The IMS signaling includes all signaling defined by the Session Initiation Protocol (SIP). Specifically to the initiation of a session, the commonly used IMS signaling is the INVITE message of SIP. In the present invention, the session initiation process is used as an example to illustrate, and the rest The processing of the IMS signaling is similar to the processing of the INVITE message. The network function entity (i.e., the network element) in the IMS network includes a call session control function (CSCF), and the CSCF can be further divided into three logical functional modules: a proxy call session control function (P-CSCF), a serving call session control function ( S-CSCF) and Interrogating Call Session Control Function (I-CSCF).

When real-time communication services are carried on the IMS network, because IMS signaling is used to establish call-related sessions and non-call-related transactions at the same time, therefore, non-call-related IMS signaling may affect call-related IMS signaling Influence, such as prolonging the call setup time, resulting in exhaustion of resources that cannot be used for call-related IMS signaling, etc. A simple example, the SIP INVITE message can be used to establish a bearer channel required by a session service, and can also be used to establish a flow to transmit text messages. These two services use the same IMS signaling to establish a call, but the session service The quality of service (QOS) level is the highest and is sensitive to delay, while the transmission of text messages is not sensitive to delay, so the requirements of the two in the process of business processing are completely different. However, at the IMS control level, each IMS network function entity sees SIP INVITE messages, and the difference between services is reflected in the description of the SDP message body. Therefore, each IMS network function entity treats these SIP INVITE messages equally. When the network load is heavy, the IMS functional entity is likely to be busy processing a lot of IMS signaling used to establish text message transmission, and has no time to process IMS signaling used to establish session services, which virtually introduces additional traffic to the establishment of session services. Call setup time, when it is serious, it will be found that there are no resources available for call-related IMS signaling.

The root cause of these impacts is that in the prior art, IMS signaling is not prioritized, and call-related IMS signaling is regarded as having the same status as non-call-related IMS signaling. In actual implementation, When a cell has a high load, limited network resources should be used to transmit more urgent services, such as the establishment of emergency calls. Moreover, the services established by these IMS signaling also need to be prioritized in the bearer network, but in the control network, there is no way to distinguish the control signaling corresponding to services of different QOS levels. The information update of (PRESENCE) service and the IMS message used to transmit the short message have actually obtained a higher priority than the delay-sensitive session service. Considering that the information update of the PRESENCE service is not only large in size but also in a large number, when the user receives the PRESENCE information at the same time during the conversation, the impact on the voice quality is very large.

Therefore, it is necessary to invent a method and system for guaranteeing the quality of session initiation.

Contents of the invention

One aspect of the present invention provides a method for ensuring session initiation quality in an IP Multimedia Subsystem (IMS) network, comprising the following steps:

(a) sending a session initiation request including priority identification information to a network element in the network by the session initiation device;

(b) The network element sorts and processes the session initiation request according to the priority identification information and sends it to the session called device;

(c) The session initiation request is answered by the session called device.

Wherein, the network element may be any one or any combination of P-CSCF, S-CSCF, and I-CSCF, and the session initiating device and the session called device may be user equipment (UE) or application server (AS).

Another aspect of the present invention provides a network unit for guaranteeing the quality of session initiation in an IP Multimedia Subsystem (IMS) network, including a priority processing module, the priority processing module includes: used to receive a message containing A receiving module for a session initiation request with priority identification information; a sorting processing module for sorting and processing the session sending request according to the priority identification information; and a sending module for sending the session sending request to the session called device module.

Wherein, the network element may be any one of P-CSCF, S-CSCF, and I-CSCF.

Another aspect of the present invention provides a system for guaranteeing session initiation quality in an IP Multimedia Subsystem (IMS) network, comprising: at least one session initiation device, configured to send a session initiation request including priority identification information;

at least one session called device, configured to respond to the session initiation request;

At least one network unit, including a priority processing module, the priority processing module includes: a receiving module for receiving a session initiation request containing priority identification information sent from a session initiation device; A sorting processing module for sorting processing of the priority identification information; and a sending module for sending the session sending request to the session called device.

In the present invention, priority analysis and sorting processing are performed on IMS signaling (that is, session initiation request) in the network unit, so that high-priority services (such as call-related services) are preferentially processed. Therefore, it is ensured that the processing of the call-independent IMS signaling does not affect the processing of the call-related IMS signaling in the case of network congestion, thereby ensuring the quality of session initiation.

In addition, in the preferred embodiment provided by the present invention, a priority processing function is also set at the called party of the session, which further guarantees the quality of session initiation. Moreover, a method for combining priority processing at the signaling layer with the bearer plane is also provided.

Other aspects and advantages of the present invention will be further described in detail in the specific implementation manner in the form of preferred embodiments with reference to the accompanying drawings.

Description of drawings

Fig. 1 is the illustrative diagram of the system of guaranteeing the quality of session initiation in a kind of IP Multimedia Subsystem (IMS) network provided by the present invention;

Fig. 2 is a message flow diagram of a session initiation request based on the system provided in Fig. 1;

Fig. 3 is a flowchart based on the prioritization processing program provided in Fig. 2;

Fig. 4 illustrates an embodiment of a system for guaranteeing session initiation quality in an IP Multimedia Subsystem (IMS) network provided by the present invention.

Fig. 5 illustrates another embodiment of a system for guaranteeing session initiation quality in an IP Multimedia Subsystem (IMS) network provided by the present invention.

Fig. 6 illustrates another embodiment of a system for guaranteeing session initiation quality in an IP Multimedia Subsystem (IMS) network provided by the present invention.

FIG. 7 illustrates an embodiment of session initiation request signaling in a method for guaranteeing session initiation quality in an IP Multimedia Subsystem (IMS) network provided by the present invention;

Fig. 8 illustrates another embodiment of the session initiation request signaling in a method for guaranteeing session initiation quality in an IP Multimedia Subsystem (IMS) network provided by the present invention;

FIG. 9 illustrates another embodiment of session initiation request signaling in a method for guaranteeing session initiation quality in an IP Multimedia Subsystem (IMS) network provided by the present invention;

FIG. 10 illustrates another embodiment of session initiation request signaling in a method for guaranteeing session initiation quality in an IP Multimedia Subsystem (IMS) network provided by the present invention;

Fig. 11 is a structural block diagram of a network unit that guarantees session initiation quality in an IP Multimedia Subsystem (IMS) network provided by the present invention;

FIG. 12 is a message flow diagram of a session initiation request based on the system in FIG. 6 .

Detailed ways

Referring to FIG. 1 , it is an exemplary diagram of a system for guaranteeing session initiation quality in an IP Multimedia Subsystem (IMS) network provided by the present invention. As shown in the figure, the IMS network 100 includes at least one session initiating device 110 . The session initiation device 110 is used to initiate a session. Generally, the session initiation device 110 mainly includes a user equipment (UE) and an application server (AS). User equipment (UE) mainly includes mobile phones, personal digital assistants (PDA), notebook computers with wireless network interfaces, etc. The application server (AS) mainly includes streaming media server, multimedia message server, short message server and so on. Whether it is a user equipment or an application server, the session initiation device 110 is the initiator of the session initiation request signaling and the receiver of the request response signaling in the IMS network 110 .

Referring to FIG. 1 , the IMS network further includes at least one session called device 130 . The session called device 130 is used to respond to the session sending request sent by the session initiating device 110 . Like the session initiating device 110, the session called device 130 mainly includes a user equipment (UE) and an application server (AS). In fact, general user equipment (UE) and application server (AS) both have sending and receiving functions. Therefore, they are divided into session initiating equipment and session called equipment from the perspective of the logical function of a session. That is to say, in practical applications, a user equipment (UE) and an application server (AS) can be used as a session initiating device or as a session called device.

Referring to FIG. 1 , the IMS network further includes at least one network unit 120 . The network element 120 mainly comprises a Call Session Control Function (CSCF). Call Session Control Function (CSCF) can be further divided into Serving Call Session Control Function (S-CSCF), Proxy Call Session Control Function (P-CSCF) and Interrogating Call Session Control Function (I-CSCF). The network unit 120 is mainly responsible for forwarding the session initiation request sent by the session initiating device 110 and the request response sent by the session called device 130 .

Referring to FIG. 1 , a session initiation device 110 is coupled to a network unit 120 , including a wired connection and a wireless connection. Likewise, the session answering device 130 is also coupled to the network unit 120, including a wired connection and a wireless connection.

Referring to Fig. 1 and Fig. 11, Fig. 11 is a structural block diagram of a network element in an IP Multimedia Subsystem (IMS) network for ensuring the quality of session initiation provided by the present invention. As shown in the figure, the network unit 120 includes a processor 1201 and a memory 1202 . The memory 1202 is a computer-readable medium on which computer programs that can run on the processor 1201 can be stored. The memory 1202 is connected to the processor 1201 through a bus 1210 . In the memory 1202, there is stored an operating system 1203 that can run on the processor 1210, and the operating system 1203 provides a platform for other computer programs to run. A processing program 1204 is also stored in the memory 1202 , and the processing program 1204 is a program for performing priority processing on the session initiation request sent by the session initiation device 110 . The network unit 120 also includes a network interface unit 1205 , which is a device for communicating with the session initiating device 110 and the session called device 130 . Of course, the network unit 120 may also include other devices, such as a user input and output unit (not shown in the figure), and the memory 1202 may also include other service programs (not shown in the figure).

Referring to Fig. 11, the processing program 1204 is a priority processing module, including: a receiving module (not shown) for receiving a session initiation request containing priority identification information sent by a session initiation device; A sorting processing module (not shown) for requesting sorting processing according to the priority identification information; and a sending module (not shown) for sending the session sending request to the called device of the session. Wherein, the sorting processing module includes an identification module for identifying the corresponding priority parameter of the session initiation request according to the priority identification information; and a module for inserting the session initiation request into a corresponding position in the request sorting queue according to the priority parameter an inserting module; and a waiting module waiting to send the session initiation request according to a sorted queue order.

Referring to FIG. 2 , it illustrates a message flow diagram of a session initiation request based on the system provided in FIG. 1 . It mainly includes 1. The session initiation device 110 sends a session initiation request to the network unit 120; 2. The network unit 120 performs priority sorting processing on the session initiation request; 3. The network unit 120 sends a session transmission request to the session called device 130; 4. 1. The session called device 130 sends a request response to the network unit 120 ; 5. The network unit 120 sends the request response to the session initiating device 110 .

With reference to Fig. 2, as can be seen from the figure, the method for guaranteeing the quality of session initiation in this IP Multimedia Subsystem (IMS) network provided by the present invention mainly includes the steps: sending the session initiation device 110 to the network element in the IMS network 100 120 sends a session initiation request that includes priority identification information; the network unit 120 sorts the session initiation request according to the priority identification information (i.e. the substance of the prioritization processing block in the figure) and then sends it to the session The called device 130: the session initiated request is answered by the session called device 130 .

Referring to FIG. 3 , there is illustrated a flowchart based on the prioritization processing procedure provided in FIG. 2 . The method includes step 301, identifying the priority of the session initiation request, that is, identifying the corresponding priority parameter of the session initiation request according to the priority identification information carried in the session initiation request. Step 302, inserting the session initiation request into the request queue, that is, inserting the session initiation request into a corresponding position in the request sorting queue according to the priority parameter. Step 303: Waiting for the session initiation request to be sent according to the sorted queue order.

In step 302, the request queue means that for the network element, many session initiation requests will be received, and when providing services for these session initiation requests, the network element adopts the form of queuing service. Commonly used queuing forms include first-come-first-serve, queuing services by priority, and so on. The present invention adopts a priority queuing service mode, that is, a session initiation request with a high priority will be served earlier than a session initiation request with a lower priority. It also includes various queuing service modes based on priority, such as queuing according to priority and first-come-first-served service mode.

In step 303, waiting to send the session initiation request according to the sorted queue order means that after the session initiation request is inserted into the request queue, the network unit will provide services one by one according to the order of the queue, for the network unit and the session initiation request In terms of requests, the network elements are waiting to send session initiation requests in the order of the sorted queue.

In a specific embodiment of the present invention, the session initiation request is a session establishment request (INVITE) message according to the Session Initiation Protocol (SIP). The priority identification information carried by the session initiation request can be determined in the following form: In a specific implementation provided by the present invention, the session initiation request signaling is shown in FIG. 7, and the signaling 700 includes the header field Priority701 and other Part 702, wherein the header field Priority701 is a part carrying priority identification information, different priority levels can be indicated by assigning different values to Priority701. For example, you can define four priority parameters from low to high for Priority701 according to the urgency of the session initiation request: "non-urgent" (not urgent), "normal" (normal), "urgent" (urgent), " and " emergency” (emergency). According to this priority parameter, the priority of the session initiation request can be identified.

In another specific embodiment provided by the present invention, the session initiation request signaling is shown in FIG. 8 , the signaling 800 includes header fields Resource-Priority801, Accept-Resource-Priority802 and other parts 803, wherein the header field Resource -Priority801 and Accept-Resource-Priority802 are the parts that carry priority identification information, wherein Resource-Priority801 carries the priority information of the session initiation request, the priority parameters can refer to the priority parameters given in Figure 7, and Accept-Resoure- Priority802 is used to carry priority identification information when responding to the request.

In yet another specific embodiment provided by the present invention, the session initiation request signaling is shown in FIG. 9, and the signaling 900 includes an original part 902 and a new priority header field 901, that is, in the original signaling A new header field is added to identify priority information. The priority header field 901 may be set in the same or similar form as the header field Priority701 or Resource-Priority801 or Accept-Resource-Priority802 or a combination of any two of them.

In yet another specific embodiment provided by the present invention, the session initiation request signaling is shown in FIG. 10 , and the signaling 1000 includes a modified header field 1001 and other parts 1002 . That is, the existing header field of the original signaling is modified, and the header field is used as the priority header field, such as the modified header field 1001 . The modified header field 1001 can be set to be the same as or similar to the header field Priority701 or Resource-Priority801 or Accept-Resource-Priority802 or a combination of any two of them.

In yet another specific embodiment provided by the present invention, the session initiation request will carry a header field that may implicitly contain priority identification information. For example, the carried session initiation request carries a service identifier, and the network confirms the priority of the session request according to the pre-configured correspondence between the service identifier and the priority. Or the session request carried, calling a specific called party, represents a specific service, and determines the request priority of the initiated call according to the service identifier. If the called party in the SIP request is a specific emergency call URI, according to the URI, the network side determines that it is an emergency call and gives corresponding priority.

Referring to FIG. 4 , it illustrates an embodiment of a system for guaranteeing session initiation quality in an IP Multimedia Subsystem (IMS) network provided by the present invention, wherein the calling and called users use the same service session control function (S- CSCF) to serve it. As shown in the figure, user equipment (UE) 410 is a session initiating device, and user equipment (UE) 430 is a session called device. The network element includes a Proxy Call Session Control Function (P-CSCF) 421 , a Serving Session Control Function (S-CSCF) 422 and a Proxy Call Session Control Function (P-CSCF) 423 . User equipment 410 is coupled to P-CSCF 421 , P-CSCF 421 is coupled to S-CSCF 422 , S-CSCF 422 is coupled to P-CSCF 423 , and P-CSCF 423 is coupled to user equipment 430 . In practical applications, the calling user and the called user may have different proxy call session control functions (P-CSCF) and serving session control functions (S-CSCF), which are not shown in the figure of this embodiment, However, the same applies to this embodiment.

Referring to Fig. 5, another embodiment of the system for guaranteeing session initiation quality in an IP Multimedia Subsystem (IMS) network provided by the present invention is illustrated, wherein the calling and called users use the same service session control function (S -CSCF) to serve it. As shown in the figure, an application server (AS) 510 is a session initiating device, and a user equipment (UE) 530 is a session called device. The network element then includes a Serving Session Control Function (S-CSCF) 522 and a Proxy Call Session Control Function (P-CSCF) 523 . The application server 510 is coupled to the S-CSCF 522 , the S-CSCF 522 is coupled to the P-CSCF 523 , and the P-CSCF 523 is coupled to the user equipment 530 . In practical applications, the calling user and the called user may have different serving session control functions (S-CSCFs). This situation is not shown in the figure of this embodiment, but this situation is equally applicable to this embodiment.

Referring to FIG. 6 , it illustrates another embodiment of a system for guaranteeing session initiation quality in an IP Multimedia Subsystem (IMS) network provided by the present invention. As shown in the figure, in this embodiment, user equipment 610 serves as a session initiating device, and user equipment 630 serves as a session called device. This embodiment involves communication between two S-CSCFs. As shown in the figure, the network elements include P-CSCF 621 , S-CSCF 622 , Interrogating Call Session Control Function (I-CSCF) 623 , S-CSCF 624 and P-CSCF 625 . User equipment 610 is coupled to P-CSCF621, P-CSCF621 is coupled to S-CSCF622, S-CSCF622 is coupled to I-CSCF623, I-CSCF623 is coupled to S-CSCF624, S-CSCF624 is coupled to P-CSCF625, P-CSCF 625 is coupled to user equipment 630 . Also, I-CSCF 623 is coupled to Home Subscription Server (HSS) 640 . In this embodiment, both the user equipment 610 and the user equipment 630 are in the roaming state, the P-CSCF621 belongs to the proxy call session control function in the roaming network of the user equipment 610, and the P-CSCF621 is responsible for the call session control of the proxy user equipment 610. The S-CSCF 622 is the call session control function of the service of the home (Home) network to which the user equipment 610 belongs, and is responsible for providing the call session control service for the user equipment 610 . The I-CSCF623 belongs to the home network to which the user equipment 630 belongs, and is a known access point for providing the calling party (ie, the user equipment 610) to query the S-CSCF serving the called party (ie, the user equipment 630) (that is, the address of S-CSCF624), so as to connect the calling party's S-CSCF (that is, S-CSCF622) and the called party's S-CSCF (that is, S-CSCF622). When inquiring, the I-CSCF623 obtains the location information of the user equipment 630 by inquiring the HSS640. The S-CSCF 624 is a Serving Call Session Control Function of the home network of the user equipment 630 . The P-CSCF 625 is a proxy call session control function in the roaming network where the user equipment 630 is located.

In several other embodiments of the present invention, the case where the session called device is an application server is also included, and the above embodiments may be referred to for the network connection. When the session initiating device and/or the session called device is an application server, it is different from the user equipment in that it does not use a proxy call session control function, but is directly coupled with the service call session control function. Other structures are the same as when the user equipment is used as the session initiating device and/or the session called device. Those skilled in the art can easily imagine the network structure diagram by referring to FIGS. 4-6 , and details are not repeated here.

Based on Figure 6, the following describes the process of a session initiation request:

1. The user equipment 610 sends a session initiation request to the P-CSCF 621 in a roaming network, specifically, it may be a SIP INVITE message. This message contains priority identification information. P-CSCF621 is determined through the CSCF discovery mechanism.

2. The P-CSCF 621 performs priority sorting on the session initiation requests. Include steps:

(b1) identifying a corresponding priority parameter of the session initiation request according to the priority identification information;

(b2) inserting the session initiation request into a corresponding position in the request sorting queue according to the priority parameter;

(b3) Waiting for sending the session initiation request according to the sorted queue order.

The step of authenticating the user equipment 610 may also be included before this prioritization processing, step (b1) may also include adjusting the priority parameter according to the network environment (such as network load), and may also include judging the priority parameter Is it allowed. After the priority sorting process, the P-CSCF 421 sends the processed session initiation requests to the S-CSCF 622 in the home network of the user equipment 610 according to the priority order.

3. The S-CSCF 622 also performs priority processing on the session initiation request, and the steps are the same as those of the P-CSCF 621 , which will not be repeated here. S-CSCF622 continues to forward the session initiation request to I-CSCF623.

4. The I-CSCF622 also performs priority processing on the session initiation request, and the steps are the same as the priority processing steps of the P-CSCF621, which will not be repeated here. After processing, I-CSCF622 inquires HSS640 to obtain the location information of user equipment 630, obtains the address of S-CSCF624 serving user equipment 630, and then sends the session initiation request to S-CSCF624.

5. The S-CSCF624 also performs priority processing on the session initiation request, and the steps are the same as the priority processing steps of the P-CSCF621, and will not be repeated here. S-CSCF624 continues to forward the session initiation request to P-CSCF625 located in the roaming network of the user equipment.

6. The P-CSCF625 also performs priority processing on the session initiation request, and the steps are the same as the priority processing steps of the P-CSCF621, which will not be repeated here. The P-CSCF 625 continues to forward the session initiation request to the user equipment 630 .

7. The user equipment 630 responds to the session initiation request, including the following steps:

(c1) identifying corresponding priority parameters according to the priority identification information of the session initiation request;

(c2) inserting the session initiation request into a corresponding position in the request sorting queue according to the priority parameter;

(c3) Respond to the session initiation request in the order of the request sorting queue.

After the above processing, the request response sent by the user equipment 630 is sent back to the user equipment 610 along the P-CSCF625-S-CSCF624-I-CSCF623-S-CSCF622-P-CSCF621-user equipment 610. The request response includes possibly adjusted priority information.

8. The user equipment 610 continues the subsequent session negotiation process after receiving the request response.

The above process is a whole process selected from the general IMS session process, and it is used as an example to illustrate how to perform priority-based processing in the IMS session process. This process is also applicable to IMS session processes in other situations, such as Session process based on the network structure shown in Figure 4 and Figure 5 . In short, regardless of whether the session initiator and/or the session called party are user equipment or an application server, whether the session initiator and/or the session called party are in a home network or a roaming network, and whether they are initiated and/or terminated by a PSTN network , or initiated and/or terminated by the IMS network, a priority processing program can be configured in the network element to distinguish services with different priorities, so that services with high priorities can be served as early as possible to improve service quality (QoS) and quality of experience (QoE).

In order to further illustrate the implementation of the method and system provided by the present invention, refer to FIG. 12 , which illustrates a message flow diagram of a session initiation request based on the system provided in FIG. 6 . As shown in the figure, both the user equipment 610 and the user equipment are located in respective visited networks (roaming networks). User equipment 610 is a session initiating device, and user equipment 630 is a session called device. The message flow of a session initiation request from user equipment 610 to user equipment 630 includes: 1. User equipment 610 sends a session initiation request to P-CSCF621; 3. S-CSCF622 performs appropriate service control; 4. S-CSCF622 sends the session initiation request to I-CSCF623 in the home network of user equipment 630; 5. I-CSCF623 initiates a location query to HSS640; 6. HSS640 responds to the location query to I-CSCF623; 7. I-CSCF623 sends the session initiation request to S-CSCF624 in the home network of user equipment 630; 8. S-CSCF624 performs appropriate service control; 9. S-CSCF624 The CSCF624 sends the session initiation request to the P-CSCF625 in the visited network of the user equipment 630; 10. The P-CSCF625 sends the session initiation request to the user equipment 630; 11. The user equipment 630 sends a request response to the P-CSCF625; 12 13. P-CSCF625 sends the request response to S-CSCF624; 14. S-CSCF624 sends the request response to I-CSCF623; 15. I-CSCF623 sends the request response to S-CSCF622 16. S-CSCF622 sends the request response to P-CSCF621; 17. P-CSCF621 performs QOS resource authorization; 18. P-CSCF621 sends the request response to UE 601. When the present invention is actually implemented, the above-mentioned priority processing function is added to each of the above-mentioned network units (P-CSCF621, S-CSCF622, etc.).

When the session initiating device is an application server (AS), on the basis of FIG. 12 in its message flow diagram, P-CSCF621 and P-CSCF625 are removed. When the application server initiates a session, it first obtains the address of the S-CSCF, and the session initiation request sent carries the initially provided session media description information. Other processing procedures are the same as those in FIG. 12 , and will not be repeated here.

In a specific embodiment of the present invention, it also includes mapping the priority parameter to the TOS field of the IP packet. Based on the above processing process, after P-CSCF621 receives the session initiation request and performs priority processing, a method is: notify PDF of the finalized signaling priority through the interface between P-CSCF621 and PDF, When an entity in the bearer network, such as GGSN, requests a control strategy from PDF, it notifies the GGSN of the priority of the corresponding PDP context at the same time, and the GGSN marks the TOS fields in the IP headers corresponding to different flows according to this information, and then Then transmit in the bearer network, because each IP packet has a DSCP mark, therefore, the bearer function entity such as SGSN or RNC that receives the IP packet will process each IP data packet according to the priority of the DSCP mark, thus The purpose of prioritizing the signaling with high priority is achieved. Another method is that the P-CSCF 621 directly marks the TOS field of the IP packet according to the priority of the signaling. After receiving the IP packet, the GGSN performs QOS classification processing on the packet according to the TOS field of the IP packet. Through the above processing, the priority processing of the signaling layer is combined with the priority processing of the bearer layer to achieve a better purpose of using resources reasonably.

What is disclosed above is only a preferred embodiment of the present invention, and of course it cannot limit the scope of rights of the present invention. Therefore, equivalent changes made according to the patent scope of the present invention still fall within the scope of the present invention.

Claims (27)

1. ensure the method for session initialization quality in an IP Multimedia System (IMS) network, comprise the steps:

(a) send the session that includes priority tag information by the network element of session initiating equipment in described network and initiate request;

(b) by this network element described session is initiated to send to the called equipment of session after request is handled by described priority tag information sorting;

(c) initiate request by the described session of the called device acknowledge of this session.

2. method according to claim 1, described ordering is handled and is comprised the steps:

(b1) request corresponding priority level parameter is initiated in described session according to described priority tag information Recognition;

(b2) according to described priority parameters request is initiated in described session and be inserted into the relevant position of asking in the sequencing queue;

(b3) press the described session to be sent of sequencing queue sequential scheduling and initiate request.

3. according to the method for claim 1, it is characterized in that: described network element comprises CSCF (S-CSCF) and/or the Proxy Call Session Control Function (P-CSCF) and/or the query call conversation control function (I-CSCF) of service.

4. according to the method for claim 1, it is characterized in that: described session initiating equipment is subscriber equipment (UE) or application server (AS).

5. according to the method for claim 1, it is characterized in that: the called equipment of described session is subscriber equipment (UE) or application server (AS).

6. according to the method for claim 1, it is characterized in that: it is conversation class request (INVITE) message or the non-conversation class message of Session Initiation Protocol that request is initiated in described session.

7. according to the method for claim 6, it is characterized in that: the information that the header field " Priority " that described priority tag information is message carries.

8. according to the method for claim 6, it is characterized in that: the information that the header field " Resource-Priority " that described priority tag information is message and " Accept-Resource-Priority " carry.

9. according to the method for claim 6, it is characterized in that:, carry described priority tag information with this priority header field for the newly-increased priority header field of message.

10. according to the method for claim 6, it is characterized in that: message comes implicit expression to represent described priority tag information by other header field.

11. the method according to claim 6 is characterized in that: revise a header field of message, carry described priority tag information with this header field.

12. the method according to claim 2 is characterized in that: step (b1) further comprises according to the network environment situation adjusts described priority parameters.

13. the method according to claim 1 is characterized in that: step (b) comprises also that before described network element to described session initiation authentication process, when wherein being subscriber equipment (UE) as if this session initiating equipment, then is that the user is carried out authentication; If when this session initiating equipment is application server (AS), then be that this application server is carried out authentication.

14. the method according to claim 1 is characterized in that: step (c) comprises the steps:

(c1) the priority tag information Recognition corresponding priority level parameter of asking according to the session initiation;

(c2) according to described priority parameters request is initiated in session and be inserted into the relevant position of asking in the sequencing queue;

(c3) initiate request by the sequential answering session of request sequencing queue.

15. the method according to claim 2 is characterized in that: also comprise the TOS field that described priority parameters is mapped to the IP bag.

16. ensure the network element of session initialization quality in an IP Multimedia System (IMS) network, comprise the processed module, this processed module comprises:

Be used to receive the receiver module of the session initiation request that includes priority tag information that comes from the transmission of session initiating equipment;

Be used for this session is sent the ordering processing module that request is handled by described priority tag information sorting;

With being used for this session is sent the sending module that request sends to the called equipment of session.

17. the network element according to claim 16 is characterized in that: described ordering processing module comprises:

The identification module of request corresponding priority level parameter is initiated in described session according to described priority tag information Recognition;

According to described priority parameters the insert module that request is inserted into the relevant position in the request sequencing queue is initiated in described session;

Press the described session to be sent of sequencing queue sequential scheduling and initiate the wait module of request.

18. the network element according to claim 16 is characterized in that: described session initiation request is conversation class request (INVITE) message or the non-conversation class message according to Session Initiation Protocol.

19. the network element according to claim 17 is characterized in that: identification module further comprises the adjusting module of adjusting described priority parameters according to the network environment situation.

20. the network element according to claim 17 is characterized in that: described network element comprises any one in service call conversation control function (S-CSCF), Proxy Call Session Control Function (S-CSCF), the query call conversation control function (I-CSCF).

21. ensure the system of session initialization quality in an IP Multimedia System (IMS) network, comprising:

At least one session initiating equipment is used to send the session that includes priority tag information and initiates request;

The called equipment of at least one session is used to reply described session and initiates request;

At least one network element comprises the processed module, and this processed module comprises:

Be used to receive the receiver module of the session initiation request that includes priority tag information that comes from the transmission of session initiating equipment;

Be used for this session is sent the ordering processing module that request is handled by described priority tag information sorting;

With being used for this session is sent the sending module that request sends to the called equipment of session.

22. the system according to claim 21 is characterized in that: described network element comprises service call conversation control function (S-CSCF) and/or Proxy Call Session Control Function (S-CSCF) and/or query call conversation control function (I-CSCF).

23. the system according to claim 21 is characterized in that: described session initiating equipment comprises subscriber equipment (UE) and/or application server (AS).

24. the system according to claim 21 is characterized in that: the called equipment of described session comprises subscriber equipment (UE) and/or application server (AS).

25. the system according to claim 21 is characterized in that: described ordering processing module comprises:

The identification module of request corresponding priority level parameter is initiated in described session according to described priority tag information Recognition;

According to described priority parameters the insert module that request is inserted into the relevant position in the request sequencing queue is initiated in described session;

Press the described session to be sent of sequencing queue sequential scheduling and initiate the wait module of request.

26. the system according to claim 21 is characterized in that: described session initiation request is conversation class request (INVITE) message or the non-conversation class message according to Session Initiation Protocol.

27. the system according to claim 21 is characterized in that: identification module further comprises the adjusting module of adjusting described priority parameters according to the network environment situation.

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