WO2009074101A1 - Procédé, système et appareil de traitement de compression d'en-tête dans un réseau sans fil - Google Patents

Procédé, système et appareil de traitement de compression d'en-tête dans un réseau sans fil Download PDF

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Publication number
WO2009074101A1
WO2009074101A1 PCT/CN2008/073327 CN2008073327W WO2009074101A1 WO 2009074101 A1 WO2009074101 A1 WO 2009074101A1 CN 2008073327 W CN2008073327 W CN 2008073327W WO 2009074101 A1 WO2009074101 A1 WO 2009074101A1
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Prior art keywords
compression
state transition
information
state
feedback
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PCT/CN2008/073327
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English (en)
Chinese (zh)
Inventor
Wenliang Liang
Jianjun Wu
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Huawei Technologies Co., Ltd.
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Publication of WO2009074101A1 publication Critical patent/WO2009074101A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/04—Protocols for data compression, e.g. ROHC
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, system and apparatus for processing header compression in a wireless network. Background technique
  • the wireless link Due to physical conditions, the wireless link has a lower transmission rate and a higher bit error rate than the wired link.
  • IP technology is applied in a wireless cell environment, there is a problem that the packet header overhead is excessive.
  • the packet payload that the user really needs is often only 22% of the entire packet. This not only wastes bandwidth, but also increases the probability that packets will be discarded due to errors. If effective measures are not taken, the quality of service (QoS) will be reduced while wasting valuable wireless network resources.
  • QoS quality of service
  • ROHC Robust Header Compression
  • the ROHC takes a reference packet in a certain stream, and only transmits information about the change of the reference packet in the header field for other packets to achieve the purpose of compression, thereby making more efficient use of the bandwidth.
  • ROHC also makes the header compression mechanism highly efficient and reasonable robust by controlling the frequency and quantity of feedback messages, strict logic for detecting out-of-synchronization, and error checking. In this way, ROHC provides a header compression mechanism suitable for high bit error rates and long latency links.
  • ROHC defines a compressor (Compressor) and a decompressor (DeCompressor), each with three states.
  • the three states of the compressor are IR (Initialization and Refresh), FO (First Order) and SO (First Order); the three states of the decompressor are NC (No Context), SC (Static Context) and FC (Full Context). ).
  • ROHC is based on the form of feedback and is divided into three modes: U-mode, R-mode, and O-mode. In U mode, communication is unidirectional, compressor state transition does not depend on feedback; negative feedback is mandatory in 0 mode; positive feedback and negative feedback are mandatory in R mode.
  • ROHC can only work above the IP layer and cannot header compression of Ethernet packets. At the same time, ROHC's operating efficiency is not high, and the underlying technology of wireless networks is not tightly integrated.
  • Packet Header Suppression is a set of header compression mechanism that can compress different profiles on multiple IP layers. It also supports header compression for Ethernet packets. Compared to ROHC and other header compression methods, there is more Wide range of applications.
  • the PHS has the following parameters, the packet header suppression size (PHSS, Packet header suppression size), the packet header suppression mask (PHSM), the packet header suppression index (PHSI), and the packet header compression domain value. (Packet header suppression field, PHSF), Packet header suppression valid (PHSV acknowledgement).
  • the PHSF is determined by the upper layer entity, and then a shorter PHSI is used instead of the PHSF and PHSM combined bit string to transmit on the air interface, thereby achieving the purpose of saving air interface resources.
  • PHS can only compress static data packet headers, and some of the services that may change during the process cannot be compressed; there is no feedback mechanism. It does not have the robustness of ROHC and the real-time dynamics accompanying the business.
  • An object of the embodiments of the present invention is to provide a method, a system, and a device for processing header compression in a wireless network, which can perform header compression under the IP layer and can change a state of a parameter whose compression mechanism changes.
  • a method for processing header compression in a wireless network includes: a compression end and a decompression end establish a data packet header compression PHC initial context;
  • the compression end When the compression state needs to be changed, the compression end sends state transition information to the decompression end to And causing the decompression end to decompress the data packet from the compression end by using the state transition information.
  • a feedback processing method for header compression in a wireless network includes: when a compression state needs to be changed, the compression end sends the state transition information to the decompression end; after receiving the state transition information, the decompression terminal utilizes The state transition information updates the decompression state, and sends feedback information to the compression end;
  • the compression end After receiving the feedback information, the compression end updates the compression state by using the state transition information.
  • the method for establishing a PHC initial context in a wireless network includes: performing a capability negotiation between a sender and a receiver, where the sender and the receiver notify their PHC support capabilities during the capability negotiation process.
  • the sending end sends a connection establishment message including a connection identifier, classifier information, and corresponding PHC information to the receiving end.
  • a processing system for header compression in a wireless network includes: a compressor and a decompressor, where
  • the compressor is configured to establish a PHC initial context with the decompressor; send a state transition information to a decompressor when the compression state needs to be converted; and send the compressed data packet to the decompressor;
  • the decompressor is configured to establish a PHC initial context with the compressor; and decompress the data packet from the compressor by using the state transition information.
  • a feedback processing system for header compression in a wireless network includes: a compressor and a decompressor, where
  • the compressor is configured to send state transition information to the decompressor when the compressed state is required to be converted, and the state transition information is compression mechanism change information; after receiving feedback information from the decompressor, using the The state transition information updates the compressed state;
  • the decompressor is configured to update the decompression state by using the state transition information, and send feedback information to the compressor.
  • a communication system provided by the present invention includes:
  • the sending device is configured to perform capability negotiation with the receiving device, notify the receiving device of the PHC support capability information of the self in the capability negotiation process, and send a connection identifier, classifier information, and corresponding to the receiving device.
  • PHC information
  • the receiving device is configured to perform capability negotiation with the sending device, and send the PHC support capability information of the self to the sending device during the establishment of the header compression mechanism.
  • the compression end and the decompression end establish a PHC initial context; when the compression end determines that the compression state needs to be converted, the state transition information is sent to the decompression end; and the decompression end uses the state transition information to data from the compression end.
  • the package is decompressed.
  • the present invention can update the dynamic parameters of the changes in real time, and can also perform header compression at the MAC layer.
  • FIG. 1 is a schematic flow chart of a method according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a format of a signaling message set according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of another signaling message format set according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a MAC PDU according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a specific process of establishing a PHC initial context on a compression end and a decompression end;
  • FIG. 7 is a schematic diagram showing a specific process of parameter negotiation in an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a flow scenario in which the compressed state changes and the compressed state is changed after the initial context of the PHC is established in the embodiment of the present invention
  • FIG. 9 is a schematic structural diagram of a processing system for header compression in a wireless network according to an embodiment of the present invention
  • FIG. 10 is a schematic structural diagram of a feedback processing system for header compression in a wireless network according to an embodiment of the present invention
  • FIG. 11 is a schematic structural diagram of a communication system according to an embodiment of the present invention.
  • the compression end after the initial PHC context is established between the compression end and the decompression end, if the initial compression parameter negotiated during the initial context establishment of the PHC changes, that is, when the compression state needs to be changed, the compression end will state.
  • the information transmission decompression end is changed, and the state transition information is compression mechanism change information; and the decompression end uses the state transition information to decompress the data packet from the compression end.
  • the method of the embodiment of the present invention includes the following steps:
  • Step 101 The compression end and the decompression end establish a PHC initial context.
  • Step 102 When the compression end determines that the compression state needs to be changed, the state transition information is sent to the decompression end, and the state transition information is compression mechanism change information.
  • the compression end can send the state transition information to the decompression end by:
  • the compression end sends a Media Access Control (MAC) protocol Packet Data Unit (PDU) to the decompression end, wherein the MAC header of the MAC PDU contains a MAC PDU carrying a state transition subheader And the state transition subheader, as shown in FIG. 2, the state transition subheader carries state transition information, and may further include a sequence number of the state transition information.
  • the state transition information may include: a PHCI and a corresponding dynamic parameter modification value.
  • the state transition subheader in FIG. 2 may further include: a CRC code, or a message digest generated by a shared key between the sender and the receiver. Therefore, before the decompressing end performs decompression processing, the decompressing end may first utilize the CRC code of the state transition information and the message digest pair compression end. The verification is performed, and after the verification is passed, the decompression process is performed.
  • the status transition subheader can be indicated by an idle bit in the MAC header. However, since there is only one idle bit on the MAC header, in order to satisfy the subsequent protocol scalability, the idle bit in the MAC header and the extensible sub-header (ESF) can be combined to indicate the state transition subheader.
  • ESF extensible sub-header
  • the state transition sub-header in the MAC PDU is used to control the compression at the MAC SDU level, so the state transitioner The relative position of the header and the MAC SDU needs to be determined.
  • PHC is a state transition subheader indication on the MAC header, and equal to 1 indicates that there is a state transition subheader after the MAC header; otherwise, there is no state. Change the subhead; PHC-UPD-SUB-H is the state transition subheader.
  • the state transition subheader may include: PHCI and its corresponding dynamic parameter modification value, sequence number of the state transition information, message digest algorithm related parameters, and CRC algorithm related parameters.
  • the sequence number of the state transition information in Fig. 2 may be: the serial number (SN) of the PHC, which is used for the index at the time of feedback.
  • Step 103 The decompressing end decompresses the data packet from the compression end by using the state transition information.
  • the compression end determines that the compression state needs to be changed, the state transition information is sent to the decompression end; that is, the compression end and the decompression end are required to update the decompression state by using the state transition information. Therefore, in the subsequent data packet transmission, the compression end can perform compression processing using the changed compression state, and the decompression end can perform decompression processing using the corresponding decompression state.
  • the compressed end and the decompressed end update compression state may include multiple modes, for example:
  • the first way is to directly update the compression end and the decompression end to update the compression state, specifically, when the compression end determines that the compression state needs to be changed.
  • the decompressing end receives the MAC PDU, such as If the MAC PDU includes an indication of a state transition subheader, the state transition information in the state transition subheader in the MAC PDU may be used to update the decompression state, and the MAC PDU is performed by using the updated decompression state. unzip.
  • the second way is to achieve this by updating the compression and decompression states at specific times or events:
  • the decompressing end compresses or does not compress the MAC PDU by using the original compression state mechanism.
  • the MAC PDU includes not only the indication of the state transition subheader, but also the state transition subheader, and further includes the compression mechanism change indication information. Therefore, the compression end may compress the MAC PDU by using the original compression mechanism or not compress the MAC PDU, update the compression state when the time or event indicated by the compression mechanism change occurs, and thereafter, may use the updated compression state pair to send Compress the MAC PDU of the decompressor.
  • the decompressing state of the decompressing end after receiving the MAC PDU, the decompressing state of the decompressing end may be updated by using the state transition information according to the time or event indicated by the compression mechanism change, and the updated solution may be utilized.
  • the compression state decompresses data packets from the compression end after a time indicated by the compression mechanism change or an event occurs.
  • the third type is that the compression end updates the decompression state after receiving the feedback update from the decompression end, which can be implemented as follows:
  • the compression end may compress or not compress the MAC PDU by using an original compression state mechanism, where the MAC header of the MAC PDU includes an indication of whether the MAC PDU carries a state transition subheader, and a state transition subheader; the decompression end receives After the MAC PDU, the decompression state is updated by using the state transition information, and the feedback information is sent to the compression end, where the update result is included; the compression end may determine whether to update the compression state according to the update result in the feedback information, if it is determined The decompressing end is updated, and the compression end renews the compressed state by using the state transition information.
  • the fourth type is that after receiving the feedback from the decompressing end, the compression end updates the decompressed state, and then instructs the decompressing end to update the decompressed state. details as follows:
  • the MAC PDU may be compressed or not compressed by using the original compression state mechanism, and after the compressed end sends the MAC PDU to the decompressing end, the decompressing end receives the MAC.
  • the feedback information is sent to the compression end, where the feedback result is included; the compression end determines whether to update the compression state according to the reception result in the feedback information, and if so, the compression end updates the compression state by using the state transition information, and After the compressor state is updated, the uncompressed MAC PDU or the first compressed MAC PDU carries the compressed end state updated indication information.
  • the decompressing end receives the indication information
  • the decompressing state is updated by using the state transition information.
  • the decompression end may send feedback information to the compression end by using a set signaling message, or may send feedback information to the compression end through a MAC PDU, and may also send feedback information to the compression end through a specific physical resource. .
  • Figure 3 is a schematic diagram of the content format (excluding the MAC header) included in the set signaling message.
  • the information message may include: a CID, a PHC1, and a reception result (Reception Result) of the dynamic parameter corresponding to the PHCI, a PHC SN and a CRC code. It may also include a message authentication code based on the hash algorithm, or a password based message authentication code (H/CMAC).
  • H/CMAC password based message authentication code
  • FIG. 5 is a schematic structural diagram of an extended MAC PDU.
  • the MAC PDU may include a PHC feedback sub-header (PHC FDBK SUB-H), and the PHC feedback sub-head may include a CID, a reception result (Reception Result), a PHC sequence number (SN), and a CRC code. . It can also include HMAC or CMAC. Similarly, if there are multiple PHC dynamic parameter status changes, the PHC's feedback subheader can also include the Reception Result for each PHCI.
  • PHC FDBK SUB-H PHC feedback sub-header
  • the PHC feedback sub-header can also include the Reception Result for each PHCI.
  • the decompression end When the compression end is the terminal side, the decompression end is the network side, and the decompression end sends the feedback information to the compression end, that is, the downlink transmission of the feedback information, the network side may notify the terminal PHC feedback through the DL-MAP message.
  • the physical resource of the information the network side can use the physical resource to send the CID, the Reception Result, the PHC SN, and the CRC code to the terminal. It can also include HMAC or CMAC.
  • the decompression end When the compression end is the network side, the decompression end is the terminal side, and the decompression end sends the feedback information to the compression end through a specific physical resource, that is, the uplink sending the feedback information, the network side may send the information to the terminal side.
  • a downlink resource allocation (DL-MAP) message is provided for indicating a specific physical resource for the terminal to perform PHC feedback. Therefore, the terminal can send feedback information on a specific physical resource specified by the network side.
  • the network side may also send an uplink resource allocation (UL-MAP) message to the terminal.
  • UL-MAP uplink resource allocation
  • the terminal receives the UL-MAP message, if the terminal has feedback information, the terminal sends the feedback information to the network side.
  • the feedback information may further include an indication of whether the transmission is complete. If the feedback information is not sent, the network side always allocates resources to the terminal until the feedback information of the terminal is sent.
  • the network side may send a UL-MAP message to the terminal in a polling manner, or may send a UL-MAP message to the terminal after receiving the feedback request from the terminal.
  • Step 601 The compression end and the decompression end perform capability negotiation. In the basic capability negotiation process, the compression end and the decompression end notify the peer end of their PHC support capability.
  • PHC parameters can be divided into two types, static and terminal related parameters, namely PHC static parameters; dynamic business related parameters, ie PHC dynamic parameters.
  • the PHC static parameters can be negotiated through SBC or REG messages during the network access process.
  • the PHC static parameters can include one or more of the following parameters: PHC capability support, that is, the ability to dynamically change the header compression parameters, and the maximum PHSS. Value, maximum value of the classifier or PHCI on a connection identifier, support for PHC feedback capability, supported feedback form, supported CRC algorithm, supported header compression method, such as: Head compression mode is PHS, PHC or ROHC .
  • the PHC dynamic parameters can be negotiated through the DSX message during the connection establishment process.
  • the following parameters can be included: PHCS initial value, PHCF initial value, PHCV initial value, PHCM initial value, PHCI, and feedback related parameters.
  • the feedback related parameter includes Whether feedback, feedback channel CID and feedback mode are required.
  • the PHC dynamic parameter may further include a message digest algorithm related parameter, and/or a CRC algorithm related parameter.
  • step 601 the PHC static parameters and the initial values of the PHC dynamic parameters are negotiated. Thereafter, when the update status changes, the PHC dynamic parameters change.
  • the SBC interaction is used as an example to describe the static parameter negotiation process:
  • the MS sends a basic capability request (SBC-REQ) message to the BS, which carries the PHC static parameter of the terminal; the BS requests the GW to rely on the relevant information of the PHC static parameter determined by the GW, and may also carry the PHC static parameter of the terminal; Requested information; The BS sends a Basic Capability Response (SBC-RSP) message to the MS, carrying the PHC static parameters of the BS.
  • SBC-RSP Basic Capability Response
  • Step 602 After performing the access authentication on the decompressing end, the compressed end sends a connection establishment message, such as a DSA request message, including a connection identifier, classifier information, and corresponding PHC information.
  • a connection establishment message such as a DSA request message, including a connection identifier, classifier information, and corresponding PHC information.
  • Step 603 After receiving the connection establishment message, the decompressing end feeds back a DSA response message to the compressed end, where the receiving end includes a receiving result of the connection establishment message, and may further include a receiving result of each PHC parameter.
  • FIG. 7 is a specific process of parameter negotiation in the embodiment of the present invention by taking a scenario triggered by a network as an example.
  • the specific process of parameter negotiation in the embodiment of the present invention is as follows:
  • Step 701 The network triggering entity triggers the BS, and the connection establishment is required.
  • the network triggering entity is the GW.
  • the step may carry the PHC dynamic parameter, but if the PHC dynamic parameter is completely controlled by the BS, the dynamic parameter may not be carried.
  • Step 702 The BS sends a Dynamic Service Addition (DSA) Request (DSA-REQ) message to the terminal, and carries the PHC dynamic parameter.
  • the PHC dynamic parameter may correspond to the connection identifier, or may correspond to the classifier. The data of different classifier rules is allowed to share a connection identifier, so there may be multiple sets of PHC dynamic parameters on a connection identifier.
  • Step 703 After receiving the DSA-REQ message, the terminal parses the PHC dynamic parameter. If there is a PHC dynamic parameter that needs to be modified, the terminal may send a DSA response (DSA-RSP) message carrying the PHC dynamic parameter to be modified to the access network. Or, notify the access network terminal to accept all PHC dynamic parameters.
  • DSA-RSP DSA response
  • Step 704 Corresponding to step 701, the BS notifies the network to trigger the acceptance status of the entity terminal; if the PHC dynamic parameter modification in the DSA-RSP needs to be confirmed, the modification information may also be carried; if it is completely controlled by the BS, it is not required.
  • Step 705 The network triggering entity performs comprehensive judgment, and gives a final PHC dynamic parameter. This step is not required if it is completely controlled by the BS.
  • Step 706 Send a DSA acknowledgement (DSA-ACK) message to the terminal in the access network, indicating that only the DSA-RSP message has been correctly received, or the final PHC dynamic parameter in step 705 is sent to the terminal through the DSA-ACK message.
  • DSA-ACK DSA acknowledgement
  • the sender and the receiver perform capability negotiation.
  • the sender and the receiver notify the peer of their own PHC support capability.
  • the sender sends the receiver to the receiver. Connection identification message, classifier information, and connection establishment message for the corresponding PHC information.
  • FIG. 8 is a flowchart showing a process in which the compressed state changes and the compressed state is changed after the initial context of the PHC is established in the embodiment of the present invention.
  • the specific process of the embodiment of the present invention is as follows:
  • Step 801 In the basic capability negotiation (SBC) process, the MS sends its own capability for PHC support to the access network; the access network sends its PHC support capability to the MS.
  • the support capabilities at this time include the PHC static parameters.
  • Step 802 Optionally, the access authentication process is performed between the MS and the access network.
  • Step 803 The access network sends a DSA request message to the MS, where the connection identifier is included. Class information and corresponding PHC information.
  • Step 804 The MS sends a DSA response message to the access network, where the receiving result of the request message and the acceptance result of the PHC parameter are included. After steps 803 and 804, the initial context of the PHC is established between the terminal and the access network.
  • Step 805 When receiving the downlink data, the access network caches the received downlink data, performs a header compression operation according to the initial context, and detects whether the data packet header of the downlink data changes, and whether the state transition needs are met. .
  • Step 806 If it is found that the data packet header of the downlink data changes and meets the requirement of the state transition, a sub-header needs to be added after the MAC header of the downlink data packet, and the updated PHC parameter is notified to the MS.
  • Step 807 If the feedback and the feedback mode are negotiated between the MS and the access network, after receiving the sub-header, the terminal performs verification, that is, CRC or message digest verification, and the terminal feeds back the verification result to the access network; For resource allocation, the access network may allocate feedback resources to the terminal in advance.
  • verification that is, CRC or message digest verification
  • the compression mechanism is established in the process of establishing a service connection, that is, when the air interface connection is established, it is determined that the application header compression mechanism needs to be negotiated and the initial dynamic parameters are negotiated.
  • the air interface connection may not be determined when the air interface connection is established.
  • the compression mechanism but after the air interface connection is established for a period of time, there is a demand (such as a tight air interface resource) triggering the application header compression mechanism.
  • the initial dynamic parameters can be negotiated using the DSC-REQ/RSP message.
  • header compression on the air interface connection can be cancelled by DSC-REQ/RSP when header compression is already applied.
  • a processing system for header compression in a wireless network includes: a compressor and a decompressor, where
  • the compressor 91 is configured to establish a PHC initial context with the decompressor; when determining that a compression state needs to be converted, send the state transition information to a decompressor, where the state transition information is compression mechanism change information; The decompressor sends the compressed data packet;
  • the decompressor 92 is configured to establish a PHC initial context with the compressor; and decompress the data packet from the compressor by using the state transition information.
  • the compressor 91 includes: a first context establishing unit 911, a state transition information transmitting unit 912, and a transmitting processing unit 913.
  • a first context establishing unit 911 configured to perform PHC initial context negotiation with the decompressor to establish a PHC initial context
  • the state transition information sending unit 912 is configured to send a MAC PDU to the decompressor when determining that the compressed state needs to be transitioned, where the MAC header of the MAC PDU includes an indication of whether the MAC PDU carries a state transition subheader, and a state transition a subheader, wherein the state transition subhead carries state transition information;
  • the sending processing unit 913 is configured to compress the data packet sent to the decompressor, and send the compressed data packet to the decompressor.
  • the compressor 91 may further include: a first updating unit 914, configured to update the compressed state by using the state transition information when the state mechanism changes.
  • the decompressor 92 may include: a second context establishing unit 921 and a receiving processing unit
  • a second context establishing unit 921 configured to perform PHC initial context negotiation with the compressor to establish a PHC initial context
  • the receiving processing unit 922 is configured to decompress the data packet from the compressor by using the state transition information.
  • the decompression 92 may further include: a second updating unit 923, configured to update the decompressed state by using the state transition information compression end after receiving the state transition information.
  • the decompression 92 may further include: a feedback unit 924, configured to send feedback information to the compressor after receiving the state transition information.
  • a feedback processing system for header compression in a wireless network may include: a compressor 11 and a decompressor 12, where
  • the compressor 11 is configured to send state transition information to the decompressor when the compression state needs to be changed, where the state transition information is compression mechanism change information; and receive the inverse from the decompressor After feeding the information, updating the compression state by using the state transition information;
  • the decompressor 12 is configured to update the decompression state by using the state transition information, and send feedback information to the compressor.
  • the compressor 11 can include:
  • the state transition information sending unit 111 is configured to: when determining that the compressed state needs to be transitioned, send a MAC PDU to the decompressor, where the MAC header of the MAC PDU includes an indication of whether the MAC PDU carries a state transition subheader, and a state transition a subheader, wherein the state transition subhead carries state transition information;
  • the first updating unit 112 is configured to update the compression state by using the state transition information after receiving the feedback information from the decompressor.
  • the decompressor 12 can include:
  • the second updating unit 121 is configured to update the decompression state by using the state transition information, and the feedback unit 122 is configured to send the feedback information to the compressor.
  • a communication system provided by an embodiment of the present invention includes:
  • the sending device 20 is configured to perform capability negotiation with the receiving end, and notify the receiving device 21 of the PHC support capability of the self in the capability negotiation process; perform access authentication on the receiving device, and send a DSA request message to the receiving device 21 , including connection identifier, classifier information, and corresponding PHC information;
  • the receiving device 21 is configured to perform capability negotiation with the receiving end, and notify the sending device 20 of the PHC support capability in the capability negotiation process; and after receiving the DSA request, feed back the DSA to the sending device 20
  • the response message includes the reception result of the request message and the reception result of the PHC parameter.
  • the state transition information may be sent to the decompression end, and the decompression end uses the state transition information to decompress the data packet from the compression end.
  • State changes can be made in real time to varying dynamic parameters. In this way, this method can perform header compression at the MAC layer or Ethernet for data packets. Header, IP packet header, UDP/TCP and other protocol headers are compressed.
  • the real-time feedback mechanism is also provided in the embodiment of the present invention, and the state change indication information is fed back to ensure the accuracy of the update operation.
  • Step 1001 The compression end and the decompression end establish a data packet header to compress the PHC initial context.
  • Step 1002 When the compression state needs to be changed, the compression end sends state transition information to the decompression end, so that the decompression end utilizes the The state transition information decompresses data packets from the compression end.
  • This embodiment can update the changed dynamic parameters in real time, and can also perform header compression at the MAC layer.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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Abstract

La présente invention porte sur un procédé de traitement de compression d'en-tête dans un réseau sans fil. Le procédé comprend les opérations suivantes : le contexte initial de compression d'en-tête de paquet (PHC) est établi d'un côté compression et d'un côté décompression ; les informations de transformation d'état sont transmises du côté compression au côté décompression lorsque l'état de compression doit être transformé ; le paquet de données provenant du côté compression est décompressé par utilisation des informations de transformation d'état du côté décompression. Selon la présente invention, il est possible que les états de paramètres dynamiques variationnels soient transformés en temps réel et que la compression d'en-tête soit effectuée dans la couche de commande d'accès au support (MAC). Simultanément, la présente invention porte sur un système et un appareil de traitement de compression d'en-tête dans un réseau sans fil.
PCT/CN2008/073327 2007-12-07 2008-12-04 Procédé, système et appareil de traitement de compression d'en-tête dans un réseau sans fil WO2009074101A1 (fr)

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