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WO2009026845A1 - Procédé d'émission et de réception de données, appareil de point d'accès sans fil, passerelle et système de communication - Google Patents

Procédé d'émission et de réception de données, appareil de point d'accès sans fil, passerelle et système de communication Download PDF

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Publication number
WO2009026845A1
WO2009026845A1 PCT/CN2008/072117 CN2008072117W WO2009026845A1 WO 2009026845 A1 WO2009026845 A1 WO 2009026845A1 CN 2008072117 W CN2008072117 W CN 2008072117W WO 2009026845 A1 WO2009026845 A1 WO 2009026845A1
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WIPO (PCT)
Prior art keywords
packet
data
user
payload
protocol
Prior art date
Application number
PCT/CN2008/072117
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English (en)
Chinese (zh)
Inventor
Zhichang Lai
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2009026845A1 publication Critical patent/WO2009026845A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/65—Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/70—Media network packetisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/16—Gateway arrangements

Definitions

  • the present invention relates to the field of communications, and in particular, to a data transmission and reception method, a wireless access point device, a gateway, and a communication system. Background technique
  • the Universal Mobile Telecommunications System is a third-generation mobile communication system that uses Wideband Code Division Multiple Access (WCDMA) air interface technology.
  • WCDMA Wideband Code Division Multiple Access
  • the UMTS includes a UMTS Terrestrial Radio Access Network ("UTRAN”) and a Core Network (“CN”).
  • UTRAN UMTS Terrestrial Radio Access Network
  • CN Core Network
  • the UTRAN is used to handle all wireless related functions
  • the CN handles all voice calls and data connections in the UMTS system and implements switching and routing functions with the external network.
  • RNS Radio Network Subsystems
  • An RNS consists of a Radio Network Controller (RNC) and one or more base stations (Node B).
  • RNC Radio Network Controller
  • Node B The interface between the RNC and the CN is the Iu interface.
  • the interface between the Node B and the RNC is the Iub interface. After the network is flattened, the functions of the RNC and the Node B are integrated.
  • the RNCs are interconnected by lur, and the lur can be connected through a direct physical connection between the RNCs or through a transport network.
  • the RNC is used to allocate and control the radio resources of the Node B connected or related to it.
  • the Node B completes the data stream conversion between the Iub interface and the Uu interface, and also participates in some radio resource management.
  • the technical problem to be solved by the embodiments of the present invention is to provide a data transmitting and receiving method, a wireless access point device, a gateway, and a communication system, which can improve the efficiency of data transmission in a circuit switched domain.
  • Providing a data sending method including:
  • Step A1 Add a corresponding service flow identifier to the packet header and the packet payload of the circuit switched domain service data transmitted between the wireless access point and the access gateway, and mark the user and the packet to which the packet belongs. length;
  • Step B1 multiplexing at least two of the packet payload, the packet header, and the corresponding service flow identifier, as a payload of the real-time transport protocol data packet or as a payload of the user data packet protocol data packet;
  • Step C1 Send the multiplexed real-time transport protocol data packet or user data packet protocol data packet.
  • Providing a data receiving method including:
  • Step A2 receiving a circuit switched domain service user data packet that is transmitted between the wireless access point and the access gateway and multiplexed by a real-time transport protocol or a user data packet protocol;
  • Step B2 parsing the multiplexed data from the data packet
  • Step C2 Demultiplexing the service flow identifier and the packet header of each user data from the multiplexed data, where the service flow identifier marks the length of the user to which the packet belongs and the length of the packet;
  • Step D2 Obtain a packet payload corresponding to the length of the user and the packet according to the service flow identifier.
  • Providing a wireless access point device comprising:
  • a first marking unit configured to increase the header of the service data of the circuit switched domain and the payload of the message Add a corresponding service flow identifier, and mark the length of the user to which the packet belongs and the length of the packet;
  • a first multiplexing unit configured to multiplex the message payload of the at least two users, the packet header, and the respective service flow identifiers added by the first marking unit, as a real-time transport protocol data packet or user The payload of the datagram protocol packet;
  • a first sending unit configured to send the real-time transport protocol data packet or the user data packet protocol data packet output by the first multiplexing unit.
  • Providing an access gateway including:
  • a selecting unit configured to select a circuit switched domain service data packet whose destination address is a different receiving user of the same wireless access point
  • a second marking unit configured to add a corresponding service flow identifier to the packet header and the packet payload of the data packet selected by the selecting unit, and mark the length of the user to which the packet belongs and the length of the packet
  • a multiplexing unit configured to multiplex the message payload of the at least two users, the packet header, and the respective service flow identifiers added by the second marking unit, as a real-time transport protocol data packet or a user data packet The payload of the protocol packet;
  • a second sending unit configured to send a real-time transport protocol data packet or a user data packet protocol data packet output by the second multiplexing unit.
  • a communication system can include the wireless access point and access gateway described above.
  • FIG. 1 is a schematic structural diagram of a UTRAN according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of an ADSL network according to an embodiment of the present invention.
  • FIG. 3 is a structural diagram of a related network element protocol stack in the ADSL network in FIG. 2;
  • 4a is a flow chart of one of the second embodiments of the data transmitting method of the present invention.
  • 4b is a flowchart of the second embodiment of the second embodiment of the data transmission method of the present invention.
  • FIG. 5a is a schematic diagram of a structure of a service flow identifier in an embodiment of the present invention
  • FIG. 5b is a schematic diagram showing the structure 2 of the service flow identifier in the embodiment of the present invention
  • 6a is a data structure diagram of RTP multiplexing in an embodiment of the present invention.
  • 6b is a data structure diagram of UDP multiplexing in the embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of an RTP compression head according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of an IuUP packet header in FIG. 6a and FIG. 6b;
  • FIG. 9 is a flow chart of a second embodiment of a data receiving method of the present invention.
  • FIG. 10 is a flowchart of a fourth embodiment of a data transmitting method according to the present invention.
  • FIG. 11 is a flowchart of a third embodiment of a data receiving method of the present invention.
  • FIG. 12 is a schematic block diagram of a first embodiment of a communication system according to the present invention, showing a first embodiment of the wireless access point device of the present invention and a first embodiment of the access gateway of the present invention;
  • Figure 13 is a schematic block diagram of a second embodiment of the communication system of the present invention.
  • FIG. 14 is a schematic block diagram of a second embodiment of a wireless access point device of the present invention.
  • 15 is a schematic block diagram of a second embodiment of an access gateway of the present invention. detailed description
  • an access gateway (Access Gateway, referred to as "AG") on the CN side controls radio resources of the UTRAN, and completes radio resource control (RRC) connection establishment and disconnection, handover, macro diversity, and Features such as wireless resource management.
  • the Access Point completes the processing of the physical layer protocol of the Uu interface, including spread spectrum, modulation, channel coding and despreading, demodulation, channel decoding, and also includes mutual conversion of baseband signals and radio frequency signals. And other functions.
  • the AP is interconnected with the AG through the elu interface.
  • the elu interface protocol stack is similar to the standard Iu-PS interface protocol stack; for circuit switched (“CS") user plane services, the elu interface The protocol stack is similar to the standard Iu-CS interface protocol stack.
  • the CS data of the AP is encapsulated in an IuUP frame and encapsulated by the Real-Time Transport Protocol/User Datagram Protocol/Internet Protocol (RTP/UDP/IP) and transmitted on the elu interface.
  • RTP/UDP/IP Real-Time Transport Protocol/User Datagram Protocol/Internet Protocol
  • the main application scenario of the AP is the home application, in order to solve the problem of poor coverage of the 3G network.
  • ADSL/ADSL2+ technology is the primary access method for home users. Therefore, one of the main transmission bearers of the elu interface is the ADSL/ADSL2+ line.
  • devices such as phones and APs access ADSL/ADSL2+ modems to form a home network, and the APs communicate with wireless UEs. All services are connected to the broadband access network through a twisted pair, and the broadband access network is connected to the AG through the FE/GE interface.
  • the encapsulated security payload (ESP) ramp mode such as IPsec
  • IPsec the encapsulated security payload
  • the protocol stack for encapsulating elu interface voice service data with IPSec is shown in Figure 3.
  • BAS Broadband Access Server
  • DHCP Dynamic Host Configuration Protocol
  • the AP can use the point-to-point protocol (Point-to).
  • PPP Point-to
  • PPP Point-to
  • PGP point-to-Point Protocol
  • the ADSL Modem is packaged in the asynchronous transfer mode adaptation layer type 5/Asynchronous Transfer mode (AAL5 " / "ATM”) and then transmitted on the ADSL line.
  • AAL5 " / "ATM asynchronous transfer mode adaptation layer type 5/Asynchronous Transfer mode
  • the protocol layer is used more, that is, the transmission efficiency is lower.
  • the protocol and total overhead of the service data through the ADSL modem to the DSLAM link are shown in Table 1.
  • Table 1 The protocol and total cost of the service data passing through the ADSL modem to the DSLAM link according to the encryption method and authentication method (message digest algorithm or secure hash algorithm, etc.) used, and the payload length, the overhead length of the IPSec layer. Variable, here calculated as a typical value of 32 bytes. If the AAL5 layer padding byte and ATM layer overhead are not considered, the total transport layer overhead is equal to 129/169 (IPv4/IPv6) bytes.
  • a TTI (equal to 20 ms) payload length is 32 bytes, plus a transport layer overhead of 129 bytes (here calculated in IPv4).
  • the length of the AAL5 layer is 161 bytes.
  • the wireless access point device connecting a few wireless users' network applications is a relatively new technology, and its purpose is to solve the technical problem that wireless terminals in indoors or in poor signal locations cannot connect to the base station.
  • existing mobile communication networks it is not possible to cover the extent of the signal at any location, but some locations where the signal is not covered may have wired communication network nodes, such as fixed telephones. Therefore, the wireless access point device can be set up in a place where the mobile network does not cover and the wired network exists, and the wireless access point device is connected to the wired network, and below, multiple wireless terminals can be connected.
  • a wireless terminal When a wireless terminal moves to the coverage of the wireless access point, it finds that it cannot connect with the original mobile network, or finds that it has entered the wireless access point device signal coverage, and can switch to the wireless access point device. However, when multiple wireless users access the wireless access point device together, the wireless access point device may be heavily loaded, affecting other services using the network, or the wireless terminal itself may not be deployed normally.
  • the invention can solve the technical problem.
  • an aspect of the present invention is to allow a service data of at least two users to share a transport layer overhead in the same wireless access point device, that is, to add a multiplexing subheader in a service flow payload of each user service, or For user identification, or service flow identification (detailed in the following embodiment section), can be used to identify individual users, and then each includes a service flow identifier (or called a multiplex sub-header, or The user ID), the header and the data payload are multiplexed together as the payload of the RTP packet.
  • a service flow identifier or called a multiplex sub-header, or The user ID
  • each of the service flow identifiers (or referred to as multiplex subheaders, or user identifiers), RTP compression headers, message headers, and data payloads may be multiplexed together as a payload of the UDP packet.
  • the service data of at least two users can share the transport layer overhead, and the average transmission overhead spread to each user service is reduced, thereby improving transmission efficiency.
  • the data transmission method of the present invention provides a first implementation manner.
  • the following steps are included:
  • Step A1 Circuit switched domain service data transmitted between the wireless access point and the access gateway Add a corresponding service flow identifier before the packet header and the message payload, and mark the user to which the packet belongs and the length of the packet;
  • Step A2 multiplexing at least two of the message payload, the packet header, and the corresponding service flow identifier as the payload of the RTP data packet;
  • Step A3 Send the multiplexed RTP data packet.
  • this embodiment may also include the following steps:
  • Step A1 Add a corresponding service flow identifier to the RTP compression header, the 4 ⁇ header, and the 4 ⁇ payload of the circuit switched domain service data transmitted between the wireless access point and the access gateway, and mark the packet The user and the length of the message;
  • Step A2 multiplexing at least two of the message payload, the packet header, the RTP compression header, and the corresponding service flow identifier as the payload of the UDP data packet;
  • Step A3 Send the multiplexed UDP packet.
  • the packet payload, the packet header, and the corresponding service flow identifier including at least two user data are multiplexed in the Together, as the payload of the RTP data packet; or multiplexing the message payload including at least two user data, the 4 ⁇ header, the RTP compression header, and the corresponding service flow identifier as the payload of the UDP packet
  • the transmission efficiency is too low due to the excessive protocol stack of the ADSL modem to the DSLAM link segment.
  • the embodiment of the present invention allows at least two circuit switched domain service data sharing for the special case of the segment transmission link. The overhead of the transport layer is reduced, so that the average transmission cost of each user service is reduced, thereby ensuring service quality and improving transmission efficiency.
  • the present invention provides a first implementation manner of the data receiving method corresponding to the first embodiment of the foregoing data transmission method.
  • the following steps are included:
  • Step B1 receiving an RTP multiplexed circuit switched domain service RTP data packet transmitted between the wireless access point and the access gateway;
  • Step B2 parsing the multiplexed data from the data packet;
  • Step B3 Demultiplexing the service flow identifier and the packet header of each user data from the multiplexed data, where the service flow identifier marks the length of the user to which the packet belongs and the length of the packet;
  • Step B4 Obtain a packet payload corresponding to the length of the user and the packet according to the service flow identifier.
  • this embodiment may also include the following steps:
  • Step B1 receiving a UDP-multiplexed circuit switched domain service UDP data packet transmitted between the wireless access point and the access gateway;
  • Step B2 parsing the multiplexed data from the data packet
  • Step B3 Demultiplexing the service flow identifier of each user data from the multiplexed data
  • An RTP compression header a message header, the service flow identifier marking a length of the user to which the message belongs and a length of the message;
  • Step B4 Obtain a packet payload corresponding to the length of the user and the packet according to the service flow identifier.
  • the embodiment provides a first implementation manner corresponding to the foregoing data transmission method, where the body that receives the RTP multiplexed data packet or the UDP multiplexed data packet may be a wireless access point or an access gateway, and the access gateway may connect each Different communication networks, therefore, demultiplexing the received data at the access gateway location, obtaining RTP data or UDP data of each user, and then transmitting to the corresponding wireless access point or communication network according to the target address, assisting wireless access Point to implement RTP multiplexing or UDP multiplexing.
  • the following embodiments implement the embodiments of the present invention by taking, transmitting, and receiving voice services as an example.
  • FIG. 4 is a flowchart of a second embodiment of a data transmitting method according to the present invention, the method includes the following steps:
  • step 401a select the same wireless access point And circuit-switching domain service data of at least two users, and adding a corresponding service flow identifier before the selected packet header and the payload of each user's data, marking the user to which the 4-page text belongs and The length of the message;
  • step 401b selecting circuit switched domain service data of at least two users under the same wireless access point, and selecting an RTP compression header and a report for each user's data. Before the header and the packet payload, the corresponding service flow identifier is added, and the user to which the packet belongs and the length of the packet are marked.
  • the present invention describes an ADSL application scenario.
  • multiple wireless user terminals are connected under the wireless access point, and the wireless access point is connected to the access gateway of the core network through an ADSL modem, DSLAM, and IP/Ethernet (IP network).
  • the ADSL modem can also be connected to a regular telephone.
  • RTP multiplexing when the wireless access point detects that the multiple wireless user terminals perform AMR voice service at the same time, RTP multiplexing may be performed on all user data, firstly: for each user voice service data The corresponding service flow identifier is added before the IuUP packet header and the IuUP packet payload.
  • the definition of the service flow identifier can be seen in Figure 5a.
  • the service flow identifier is used to mark the user to which the message belongs and the length of the message. In this embodiment, one byte is used for marking.
  • this byte contains two fields, the user ID and the length indication.
  • the user identification field is used to identify which user the AMR voice service flow belongs to, which is 2 bits, and can identify 4 users, and can reuse 4 AMR voice service flows.
  • UDP multiplexing when the wireless access point detects that the multiple wireless user terminals perform AMR voice service at the same time, UDP multiplexing may be performed on all user data.
  • the voice is used for each user.
  • RTP compression header, IuUP header and The corresponding service flow identifier is added before the IuUP 4 payload, and the definition of the traffic identifier can be seen in Figure 5b.
  • the service flow identifier is used to mark the user to which the message belongs and the length of the message. In this embodiment, three bytes are used for marking.
  • the service flow identifier contains a service flow identification field and a length indication field.
  • the service flow identification field is used to identify which user the AMR voice service flow belongs to, and is 2 bytes in length.
  • step 402a multiplexing the packet payload, the packet header, and the added service flow identifier of each user data as the payload of the RTP data packet;
  • the point continues to perform RTP multiplexing, specifically multiplexing all the user data or the selected part of the user data packet payload, the packet header, and the added respective service identifiers, as the payload of the RTP data packet, encapsulated into RTP/UDP/IP and the underlying protocol; for example, multiplexing multiple user data that needs to perform AMR voice service at the same time, that is, the packet payload, packet header, and service flow identifier of each user data as one
  • the subunit encapsulates a plurality of the subunits as a payload of an RTP data packet.
  • Each IuUP packet corresponds to a user identifier or a service flow identifier
  • the IuUP packet, or IuUP packet payload, or service flow payload includes: an IuUP packet header and a message payload.
  • the user ID or service flow identifier is the IuUP packet exclusive cost, or the service flow exclusive cost.
  • step 402b multiplexing the message payload, the 4 ⁇ header, the RTP compression header, and the added service flow identifier of each user data as UDP.
  • the payload of the packet referring to FIG. 4b, step 402b: multiplexing the message payload, the 4 ⁇ header, the RTP compression header, and the added service flow identifier of each user data as UDP.
  • the payload of the packet referring to FIG. 4b, step 402b: multiplexing the message payload, the 4 ⁇ header, the RTP compression header, and the added service flow identifier of each user data as UDP.
  • the wireless access point continues to perform UDP multiplexing, specifically multiplexing all the user data or the selected part of the user data packet payload, the packet header, the RTP compression header, and the added respective service identifiers as UDP data.
  • the payload of the packet is encapsulated into UDP/IP and the underlying protocol; for example, multiplexing multiple user data that needs to perform AMR voice service at the same time, that is, the payload of the packet for each user data, the header of the packet,
  • the RTP compression header and the service flow identifier are used as a subunit, and a plurality of the subunits are encapsulated as a payload of a UDP packet.
  • each IuUP packet contains an AMR voice service flow and an IuUP header, and the AMR voice service flow is a message payload, and the IuUP packet is used as a service flow.
  • the payload of each IuUP packet, or service flow overhead consists of two parts: the RTP compression header and the service flow identifier.
  • the RTP compression header contains two parts of information, one part is the serial number (1 byte), one part is the timestamp (2 bytes), and the RTP compression header is defined as shown in Figure 7.
  • the service flow identifier is mainly used to identify the corresponding service flow. The length of the user and the business flow. Based on the data packet structure defined in Figure 6b, multiplexing of the same user service flow can be realized, and multiplexing of different user service flows can also be realized.
  • FIG. 8 is a schematic structural diagram of an IuUP packet header in FIG. 6a and FIG. 6b.
  • the IuUP header of each AMR voice service flow includes a PDU type, a frame number, a frame quality control (FQC), and an RAB sub-flow combination indicator. , referred to as RFCI), Header Cyclic Redundancy Check and Payload Cyclic Redundancy Check.
  • the PDU type is used to indicate the PDU type.
  • the RFCI is used to indicate the RAB substream type and combination in the AMR voice service flow, and gives a Frame Number.
  • the Frame Number can be a time-based or transmitted IuUP PDU.
  • the frame Number When the Frame Number is based on the time number, the purpose of the Frame Number is to help handle the Time Alignment function; when the Frame Number is based on the transmitted IuUP PDU, the frame number ( Frame The purpose of Number ) is to provide the receiving entity with a mechanism to understand the loss of IuUP frames.
  • FQC is used for frame quality grading.
  • the CRC is used for header (header) and payload (payload) checks.
  • step 403a transmitting the multiplexed RTP data packet.
  • step 403b transmitting the multiplexed
  • the access gateways in the core network are sent through the wireless access point, the client device, the central office device, and the IP/Ethernet network.
  • the access gateway may be sent to the core network through a wireless access point, an ADSL modem, a DSLAM, or an IP/Ethernet network.
  • the third embodiment of the data transmitting method of the present invention is similar to the second embodiment described above, except that: the multiplexed data stream passes through a cable modem (Cable modem), and the cable modem head end system CMTS (Cable Modem Termination System) ) and IP/Ethernet networks for transmission.
  • CMTS Cable Modem Termination System
  • the present invention further provides a second embodiment of a data receiving method, which corresponds to the foregoing second embodiment of the data sending method, where the UDP multiplexing scenario is taken as an example, and the RTP multiplexing scenario is similar to the UDP multiplexing scenario. Further reference can be made to the text description of the following embodiments.
  • the second embodiment of the data receiving method includes the following steps:
  • step 801 is to receive an RTP multiplexed circuit switched domain service RTP data packet transmitted between the wireless access point and the access gateway;
  • step 801 may be: receiving a UDP-multiplexed circuit switched domain service UDP data packet transmitted between the wireless access point and the access gateway;
  • the received RTP data packet or the UDP data packet is sent from the wireless access point, and is transmitted through the user equipment, the central office equipment, and the IP network.
  • the embodiment uses the data as the adaptive multi-rate AMR voice.
  • the data is taken as an example for explanation.
  • the user equipment and the central office equipment may be an ADSL modem and a DSLAM, respectively, and may also be a cable modem and a cable modem head end system (CMTS).
  • CMTS cable modem and a cable modem head end system
  • step 802 is to parse the multiplexed RTP data from the data packet.
  • step 802 may be: parsing the multiplexed UDP data from the data packet;
  • the access gateway parses the multiplexed data from the data packet according to a demultiplexing method negotiated with the wireless access point.
  • the data includes the multiplexed voice service reports.
  • the service flow identifier, the RTP compression header, the IuUP packet header, the IuUP packet payload, or the RTP multiplexed scenario the data includes the service flow identifier and the IuUP packet of the multiplexed voice service packets. Header, IuUP message payload.
  • the parsing method may be that the access gateway reverses the operation of multiplexing and encapsulating data according to the wireless access point.
  • the protocol layer data such as IP is removed, and the service flow identifier, RTP compression header, IuUP packet header, and IuUP packet payload of all voice service packets are left, that is, the UDP is reserved. Packet payload.
  • the protocol layer data such as UDP/IP is removed, and the service flow identifier, IuUP packet header, and IuUP packet payload of all voice service packets are left, that is, the multiplexed RTP packets are left. Payload.
  • step 803 Demultiplexing the service flow identifier and the packet header of each voice service packet from the multiplexed data, where the service flow identifier marks the user to which the packet belongs And the length of the message;
  • This step is a process of parsing the above steps, and demultiplexing the multiplexed RTP payload, according to the data format of the wireless access point after adding the service flow identifier before the packet header and the message payload, from a single user.
  • the service flow identifier and the packet header are parsed in the data packet.
  • step 803 may be: demultiplexing from the multiplexed data.
  • This step is a process of resolving the multiplexed UDP payload, and the data format is added according to the wireless access point before the RTP compression header, the packet header, and the packet payload.
  • the service flow identifier, the RTP compression header, and the packet header are parsed from a single user's data packet.
  • step 804 Obtain a packet payload corresponding to the length of the user and the packet according to the service flow identifier.
  • the user to which the message belongs is determined, and then the length of the packet is determined, and the length is obtained from the multiplexed data.
  • one byte or three or four bytes may be used to identify the user to which the message belongs, and other bytes identify the length of the message.
  • step 804 may be: obtaining, according to the service flow identifier, a packet payload corresponding to the length of the user and the packet;
  • the user to which the message belongs is determined, and then the length of the message is determined according to the length of the one-byte field, and the obtained data is obtained from the multiplexed data.
  • one byte or three or four bytes may be used to identify the user to which the message belongs, and other bytes identify the length of the message.
  • step 805 encapsulating the packet header and the packet payload of each user into respective data packets
  • step 805 may be: encapsulating the RTP compression header, the packet header, and the packet payload of each user into respective data packets;
  • Step 806 Send the encapsulated data packet.
  • the access gateway For the target address in the header, the access gateway sends the AMR voice service data of the corresponding user to the target address.
  • the above is a method for transmitting multiplexed data from a wireless access point to an access network.
  • the following describes an embodiment of the method for transmitting multiplexed data from an access gateway to a wireless access point.
  • the fourth embodiment includes the following steps:
  • step 901 selecting circuit switched domain service data of at least two users whose destination addresses are the same wireless access point, and before selecting the data packet header and the text payload of each user. Add a corresponding service flow identifier;
  • step 901 may be: selecting circuit switched domain service data of at least two users whose destination addresses are the same wireless access point, and compressing the header and text for each selected user RTP data. Add the corresponding service flow identifier before the header and the payload;
  • step 902 adding a corresponding service flow identifier before the packet header and the payload of each user voice data packet, marking the user and the message to which the 4 ⁇ text belongs. length;
  • step 902 may be: adding a corresponding service flow identifier to the RTP compression header, the packet header, and the packet payload of each user voice data packet, and marking the packet to belong to User and the length of the message;
  • step 903 multiplexing the packet payload, the packet header, and the respective service flow identifiers of the at least two users as the payload of the RTP data packet, and packaging the data into the RTP/UDP. /IP and underlying protocol;
  • step 903 may be: including at least two users.
  • the payloads, 4 ⁇ headers, RTP compression headers, and respective service flow identifiers are multiplexed together as the payload of the UDP packet, encapsulated into UDP/IP and the underlying protocol;
  • step 904 Send the multiplexed RTP data packet to the wireless access point.
  • step 904 may be: sending the multiplexed UDP data packet to the wireless access point.
  • the foregoing embodiment is similar to the foregoing embodiment of the present invention.
  • the user When receiving voice data from different users on the access gateway side, the user whose destination address is the same wireless access point is selected. Data, and then multiplex the message payload, the packet header, the RTP compression header, and the respective service flow identifiers of the foregoing user voice data, or the message payload and the packet header of each user voice data.
  • the respective service flow identifiers are multiplexed together, as the payload of the UDP data packet or the RTP data packet, and the technical problem of the transmission efficiency is too low due to the excessive ADSL modem-DSLAM link segment protocol stack in the prior art, the embodiment of the present invention
  • the voice data of multiple users share the overhead of the transmission layer, so that the average transmission overhead allocated to each user service is reduced, thereby improving the transmission efficiency.
  • the user identifier corresponding to the packet header and the payload of each user is increased by: adding an IuUP user identifier to each user's IuUP header and IuUP payload. .
  • the length of the user identifier is one byte, and two bits of the user identifier are used to identify the user to which the message belongs, and the other bits of the byte are used to identify the length of the message.
  • two or three bytes or the like can also be used as the length of the user identification.
  • the identifiers corresponding to the RTP compression header, the packet header, and the payload of each user are added to: include an RTP compression header for the IuUP header and the IuUP payload of each user service flow. , business flow identification.
  • the length of the service flow identifier is three bytes, and two bytes are used to identify the user to which the message belongs, and one byte is used to identify the length of the message. Of course, one byte or three bytes or four bytes may be used as the length of the service flow identifier.
  • a third embodiment of the data receiving method of the present invention is provided corresponding to the fourth embodiment of the data transmitting method of the present invention.
  • the UDP multiplexing scenario is used as an example.
  • the RTP multiplexing scenario is similar to the UDP multiplexing scenario. You can refer to the text description of the following embodiments.
  • Data Receiving Method The third embodiment includes the following steps:
  • step 1001 the wireless access point receives the response from the access gateway.
  • step 1001 may be: The wireless access point receives the RTP multiplexed circuit switched domain service data packet from the access gateway;
  • step 1002 parsing RTP multiplexed data from the user data packet protocol data packet;
  • step 1002 may be: parsing UDP multiplexed data from a user data packet protocol data packet;
  • step 1003 Demultiplexing the service flow identifier, the packet header, and the packet payload of each user service from the data, where the service flow identifier marks the user to which the packet belongs. And the length of the message;
  • step 1003 may be: demultiplexing the service flow identifier, the RTP compression header, the packet header, and the packet payload of each user service from the data, where the service flow identifier is The user to which the message belongs and the length of the message;
  • Step 1004 Obtain a message payload corresponding to the length of the user and the packet according to the service flow identifier.
  • the present embodiment is a process in which a wireless access point receives and demultiplexes RTP data packets or UDP data packets from an access gateway.
  • the wireless access point can receive AMR voice data through an IP/Ethernet network, a central office device, and a client device, and the method includes but is not limited to the following two types:
  • the wireless access point accesses the multiplexer DSLAM through the IP/Ethernet network and digital subscriber line.
  • an asymmetric digital subscriber loop ADSL modem receives adaptive multi-rate AMR voice data;
  • the wireless access point receives AMR voice data over the IP/Ethernet network, CMTS, and cable modem.
  • the payload is sent wirelessly to the corresponding user terminal.
  • the data transmission and reception method of the present invention can also be applied to a video service, such as a video telephone service.
  • a video service such as a video telephone service.
  • the user circuit switched domain service data is video telephone service data.
  • RTP multiplexing when marking the user to which the message belongs and the length of the message: use the partial bits of the two bytes to identify the user to which the message belongs, and use the other bits of the two bytes. A portion of the bits identify the length of the 4 ⁇ text. For example, a part or all of the bits of a byte are used to identify the user to which the message belongs, and the length of the message is used to identify the length of the message. .
  • the storage medium referred to herein is, for example, a ROM/RAM, a magnetic disk, an optical disk, or the like.
  • FIG. 12 is a schematic block diagram of a first embodiment of a communication system of the present invention, showing a first embodiment of a wireless access point device of the present invention.
  • the wireless access point device includes:
  • the first marking unit 1110 in the scenario of RTP multiplexing, is configured to add a corresponding service flow identifier before the payload of the circuit switched domain service data.
  • the corresponding RTP compression header and the service flow identifier are added before the packet header and the packet payload of the circuit switched domain service data; the service flow identifier is used to mark the user to which the packet belongs. And the length of the message;
  • the first multiplexing unit 1120 is configured to multiplex the message payload of the at least two users, the packet header, and the respective service flow identifiers added by the first marking unit 1110 in a scenario of RTP multiplexing. Together, as the payload of the RTP packet;
  • the packet payload, the packet header, the RTP compression header, and the respective service flow identifiers added by the first marking unit 1110 are multiplexed together by the at least two users.
  • the payload as a UDP packet
  • the first sending unit 1130 is configured to send the RTP data packet or the UDP data packet output by the first multiplexing unit 1120.
  • the first sending unit 1130 may transmit the multiplexed service data by using the user equipment, the central office equipment, and the IP network.
  • the embodiment uses the adaptive multi-rate AMR voice data as an example. description.
  • the client device and the central office device may be an ADSL modem and a DSLAM, respectively, and may also be a cable modem and a CMTS, respectively.
  • the first marking unit 1110 is specifically configured to add an RTP compression header, an IuUP service flow identifier, or an RUP multiplexing scenario to the IuUP header and the IuUP payload of each user voice service in a scenario of UDP multiplexing.
  • the IuUP service flow identifier is added to the IuUP header and the IuUP payload for each user voice service.
  • FIG. 12 is a schematic block diagram of a first embodiment of a communication system according to the present invention.
  • the first embodiment of the access gateway of the present invention is shown, which corresponds to the first implementation manner of the foregoing wireless access point device, and the access gateway includes:
  • the second receiving unit 1140 is configured to receive the RTP multiplexed RTP data packet from the wireless access point, that is, receive the RTP data packet from the first sending unit 1130 in a scenario of RTP multiplexing;
  • the RTP multiplexed data is parsed from the RTP data packet output by the second receiving unit 1140;
  • the second demultiplexing unit 1160 is configured to demultiplex the service flow identifier and the packet header of each user data from the data output by the second parsing unit 1150 in a scenario of RTP multiplexing, where the service flow is Defining the length of the user to which the packet belongs and the length of the packet, and demultiplexing the user data from the data output by the second parsing unit 1150 according to the service or in a UDP multiplexing scenario.
  • the service flow identifier, the RTP compression header, and the packet header, the service flow identifier marks the length of the user to which the packet belongs and the length of the packet, and obtains the RTP compression header and the report of the user according to the service flow identifier.
  • the header and the payload of the message corresponding to the length of the message.
  • the method further includes:
  • the first encapsulating unit 1170 is configured to use, in the scenario of the RTP multiplexing, the second demultiplexing or UDP multiplexing scenario, for each user that outputs the second demultiplexing unit 1160.
  • the RTP compression header, the packet header, and the message payload are encapsulated into respective data packets;
  • the third sending unit 1180 is configured to send a data packet of each user output by the first encapsulating unit 1170.
  • the service may be a voice service, such as an AMR voice service, or a video service, such as a video telephony service, or other services in a circuit switched domain.
  • the second demultiplexing unit 1160 is specifically configured to parse the IuUP service flow identifier and the IuUP packet header of each user voice service packet from the data packet payload in the scenario of RTP multiplexing. Obtaining, according to the IuUP service flow identifier, an IuUP packet header of the user and an IuUP packet payload corresponding to the packet length;
  • the IuUP service flow identifier for parsing the voice service packets of the user from the data packet payload, and according to the IuUP service flow identifier. And obtaining an RTP compression header, an IuUP packet header, and an IuUP packet payload of the corresponding packet length.
  • the present invention further provides a second implementation manner of an access gateway, including:
  • the selecting unit 1210 is configured to select an RTP voice data packet or a UDP voice data packet whose destination address is different receiving users of the same wireless access point;
  • the second marking unit 1220 adds a corresponding service flow identifier before the packet header and the message payload of each user voice data packet selected by the selecting unit 1210 in the RTP multiplexing scenario.
  • the RTP compression header, the 4 ⁇ header, and the 4 ⁇ payload of each user voice data packet selected by the selecting unit 1210 are added with corresponding service flow identifiers, and the service is added.
  • the flow identifier marks the length of the user to which the packet belongs and the length of the packet;
  • the second multiplexing unit 1230 in the scenario of RTP multiplexing, is used as the RTP for the message payload of the at least two users, the packet header, and the respective service flow identifiers added by the second marking unit 1220.
  • the payload of the packet encapsulated into RTP/UDP/IP and the underlying protocol;
  • the packet service payload, the packet header, the RTP compression header, and the second service unit identifier added by the second label unit 1220 are used as UDP packets.
  • the second sending unit 1240 is configured to send an RTP data packet or a UDP data packet output by the second multiplexing unit 1230 to the wireless access point.
  • the first and second embodiments of the access gateway may be integrated to implement the respective functions.
  • the present invention further provides a second implementation manner of a wireless access point device, corresponding to the second implementation manner of the access gateway, including:
  • the first receiving unit 1310 is configured to receive the RTP multiplexed RTP data packet from the access gateway, or to receive the UDP multiplexed UDP data packet from the access gateway;
  • the first parsing unit 1320 is configured to parse RTP multiplexed user voice service data from the RTP data packet received by the first receiving unit 1310 in a scenario of RTP multiplexing;
  • the first demultiplexing unit 1330 is configured to parse a service flow identifier and a packet header of each user voice service from the data output by the first parsing unit 1320 in a scenario of RTP multiplexing, where the service flow identifier is used. Marking the length of the user to which the packet belongs and the length of the packet, and obtaining the payload of the packet corresponding to the length of the user and the packet according to the service flow identifier;
  • the service flow identifier, the RTP compression header, and the packet header of each user voice service are parsed from the data output by the first parsing unit 1320, and the service flow identifier is The user to which the packet belongs and the length of the packet, and the payload of the packet corresponding to the length of the user and the packet is obtained according to the service flow identifier.
  • the demultiplexed message payload can be sent to the corresponding wireless user device under the wireless access point device.
  • the present invention may further provide the first and second implementation manners of the wireless access point device to integrate the respective functions.
  • the present invention also provides a first embodiment of a communication system, including a wireless access point.
  • Equipment and access gateway For a specific implementation manner of the wireless access point device and the access gateway, refer to the foregoing descriptions of various communication systems, wireless access point devices, and access gateway embodiments.
  • the communication system may further include:
  • An IP/Ethernet network 1410, a digital subscriber line access multiplexer DSLAM 1420, and an asymmetric digital subscriber loop ADSL modem 1430 are connected in series between the first transmitting unit 1130 and the second receiving unit 1140; or
  • An IP/Ethernet network, a cable modem head end system CMTS, and a cable modem are connected in series between the first transmitting unit 1130 and the first receiving unit 1140.
  • the technical solution provided by the embodiment of the present invention increases in the specific scenario between the wireless access point and the access gateway, before the packet header and the message payload of the circuit switched domain service data.
  • Corresponding service flow identifier marking the length of the user to which the message belongs and the length of the packet, multiplexing the packet payload, the packet header, and the respective service flow identifiers of at least two users, as the net of the RTP data packet.
  • the cost of each segment of the user is shared by the data of the segment, so that the average transmission cost evenly distributed to each user service is reduced, thereby improving the transmission efficiency.
  • the corresponding service flow identifier is added before the real-time transport protocol compression header, the packet header, and the packet payload of the circuit switched domain service data, and the label is added.
  • the user and the length of the packet to which the packet belongs are multiplexed with the packet payload, the packet header, the real-time transport protocol compression header, and the respective service flow identifiers of the two users as the payload of the UDP packet.
  • the data of each user is shared by the data of the segment, so that the average transmission cost evenly distributed to each user service is reduced, thereby improving the transmission efficiency.
  • the embodiment of the invention uses the UDP packet multiplexing or RTP packet multiplexing multiplexing method to reduce the amount of data transmission and meet the requirements of simultaneously using two users.
  • the foregoing units in the first embodiment of the wireless access point device of the present invention may be integrated into one processing module.
  • other embodiments of the foregoing wireless access point of the present invention are connected.
  • Each unit in each embodiment of the gateway and communication system can also be integrated into one processing module; or in a module.
  • the units in the embodiments of the wireless access point device, the access gateway, and the communication system in the embodiments of the present invention may be implemented in the form of hardware, and the software-implemented part may also use the software.
  • the form of the functional module is implemented. Accordingly, embodiments of the invention may be sold or used as separate products, and the software implementable portions may also be stored in a computer readable storage medium for sale or use.
  • the embodiments of the present invention can be used for GSM AP, CDMA AP, WiMAX AP, and WiFi to improve transmission efficiency when transmitting multiple voice data.
  • GSM AP the overall technical solution is the same as this one. The only difference is that the air interface technology used is different from that of the UMTS AP.
  • the signal processing principle of the AP after receiving the air interface demodulation is the same as the technical solution.
  • the technical solution of the AG processing is also the same as the technical solution provided by the embodiment of the present invention.
  • the embodiment of the present invention is not limited to the interface application of the UMTS AP/AG elu, and is not limited to the voice service of the elu interface, and can also be applied to the video telephone service and the fax service.
  • the present invention can at least produce the following technical effects:
  • the embodiment of the present invention can effectively reduce the average cost of real-time transmission protocol data transmission between the wireless access point device and the access gateway, improve transmission efficiency, and save transmission bandwidth;
  • the efficiency of the multiplexing of different user voice services and the ADSL layer rate are shown in the following table. It can be seen from the table that after the multiplexing technology is used, when the ADSL layer provides only 128 kpbs bandwidth, it can carry voice services of four wireless terminals. And using the conventional method, only one voice service of the wireless terminal can be transmitted. 1 voice user industry reuse 2 users reuse 3 users reuse 4 user services (no multiplexing) business business services
  • Table 2 Efficiency and ADSL layer rate comparison table for multiplexing different user services
  • each wireless access point device can allow two or more wireless user terminals to simultaneously use the circuit switched domain service, and only one wireless user terminal can use the wireless access point device to perform various services such as voice.
  • the embodiments of the present invention are directed to a scenario in which a wireless access point device connects to a wireless user in a communication system with a small number of wireless users, and uses RTP multiplexing or UDP multiplexing to reduce the amount of data sent, improve transmission efficiency, and satisfy multiple users simultaneously. Improve the quality of service by using the needs of the business.

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Abstract

L'invention décrit un procédé d'émission et de réception de données, un appareil de point d'accès sans fil, une passerelle et un système de communication. Le procédé d'émission et de réception de données consiste à effectuer les opérations suivantes : ajouter un identifiant de flux de trafic correspondant avant un message qui comprend un en-tête de message et une charge utile de message, ledit message représentant des données de trafic de terrain à commutation de circuits transmises entre le point d'accès sans fil et la passerelle d'accès, l'identifiant de flux de trafic identifiant l'utilisateur auquel le message appartient et la longueur du message, assembler au moins deux ensembles de la charge utile du message, l'en-tête de message et l'identifiant de flux de trafic correspondant sous forme d'une charge utile de paquet de données RTP (protocole de transport en temps réel) ou d'une charge utile de paquet de données UDP (protocole de datagramme utilisateur), et envoyer le paquet de données RTP ou le paquet de données UDP assemblés. Grâce au procédé d'émission et de réception de données, à l'appareil de point d'accès, à la passerelle et au système de communication, l'efficacité de la transmission de données de trafic de terrain à commutation de circuits peut être améliorée.
PCT/CN2008/072117 2007-08-23 2008-08-22 Procédé d'émission et de réception de données, appareil de point d'accès sans fil, passerelle et système de communication WO2009026845A1 (fr)

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