WO2013067809A1 - Procédé et dispositif de traitement de segmentation et de recombinaison de données intercouche de protocole - Google Patents

Procédé et dispositif de traitement de segmentation et de recombinaison de données intercouche de protocole Download PDF

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Publication number
WO2013067809A1
WO2013067809A1 PCT/CN2012/076101 CN2012076101W WO2013067809A1 WO 2013067809 A1 WO2013067809 A1 WO 2013067809A1 CN 2012076101 W CN2012076101 W CN 2012076101W WO 2013067809 A1 WO2013067809 A1 WO 2013067809A1
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WIPO (PCT)
Prior art keywords
layer
packet
sndcp
data
pdu
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PCT/CN2012/076101
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English (en)
Chinese (zh)
Inventor
朱寰
郭文丹
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中兴通讯股份有限公司
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Publication of WO2013067809A1 publication Critical patent/WO2013067809A1/fr

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Classifications

    • 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

Definitions

  • Protocol layer data segmentation Protocol layer data segmentation, recombination processing method and device
  • the present invention is directed to the field of mobile communications, and in particular, to a method for processing data segmentation and reassembly between protocols based on a GPRS (General Packet Radio Service) system, and a segmentation/reassembly processing device.
  • GPRS General Packet Radio Service
  • GPRS is a mobile packet data service developed on the basis of the existing GSM (Global System for Mobile Communication). GPRS introduces a packet-switched functional entity in the GSM digital mobile communication network to complete the data transmission in the packet mode to complete the GPRS service, and the original GSM network completes the voice function.
  • the GPRS system can be seen as a service extension based on the original GSM circuit-switched system to support the need for mobile users to access the Internet or other packet data networks using packet data mobile terminals.
  • the basic network structure of the GPRS system is shown in Figure 1.
  • the wireless protocol stack structure contains multiple protocols.
  • the wireless data plane protocol stack structure of the GPRS system is shown in Figure 2.
  • the SNDCP Subnetwork Dependent Convergence Protocol
  • the SNDCP Subnetwork Dependent Convergence Protocol
  • Transmission saves the wireless bandwidth resources of the wireless interface between the terminal and the core network, and improves the data transmission efficiency.
  • the SNDCP layer protocol there is no indication of the specific size of the layer segment, and the specific segmentation is large.
  • the small size is limited by the segmentation size of the LLC (Logical Link Control) layer. If the LLC is an acknowledgment frame, that is, in the acknowledge mode, the size of each segment does not exceed 1520 Bytes; if the LLC is a non-acknowledgement frame, that is, in the no-answer mode, each segment does not exceed 500 Bytes. Therefore, the upper protocol layer is subject to the lower protocol layer, and the coupling between the upper protocol layer and the lower protocol layer is relatively large and cannot be independent of each other. Summary of the invention
  • the main object of the present invention is to provide a method and device for data segmentation and reassembly between protocol layers based on GPRS system, so as to solve the problem of excessive coupling between protocols.
  • a method for inter-layer data segmentation processing based on GPRS system comprising:
  • the IP packet is segmented according to the set SNDCP layer packet length, and each segment is added with a SNDCP header to form a segment subnet protocol data unit SN PDU packet;
  • the segmented SN PDU message of the SNDCP layer is transmitted to the logical link control LLC layer; each segment is added with a LLC prefix to form a segmented LLC PDU message.
  • the packet data packet length of the SNDCP layer is greater than or equal to the LLC layer packet data packet length.
  • the SNDCP prefix is added to each segment to add the following content to each segment: an idle bit field, a first segment indicator field, a last segment indicator field, a PDU number field, The segment number field in the non-acknowledgement mode, and the packet packet length field.
  • the SNDCP header further includes: a data compression coding field and a protocol control information compression coding field, for the first segment SN PDU message.
  • adding the LLC prefix to each segment is to add the following content to each segment: Address field Fields, Control Domain Fields, and Frame Check Fields.
  • a method for reorganizing data between protocol layers based on a GPRS system comprising: sending the obtained SN PDU message to the SNDCP layer;
  • the IP layer reassembles the received IP packets.
  • the packet data packet length of the SNDCP layer is greater than or equal to the LLC layer packet data packet length.
  • the process of sorting and combining the IP data segments includes: parsing a header of the SN PDU packet, obtaining a sequence number of the packet in the prefix, and sorting the IP data segment according to the sequence number of the packet .
  • a protocol inter-layer data segmentation/reassembly processing device based on a GPRS system comprising: a lower layer transceiver module, an upper layer transceiver module, a segmentation/reassembly module;
  • the segmentation/reassembly module is configured to set a packet data packet length of the SNDCP layer, and is configured to receive an IP packet by using an upper layer transceiver module, and process the IP packet according to the set SNDCP layer packet length.
  • the lower layer transceiver module is forwarded to the LLC layer.
  • the SN PDU packet is received by the lower layer transceiver module, and the SN PDU packet is reassembled according to the set SNDCP layer packet length.
  • the packet data packet length of the SNDCP layer is greater than or equal to the length of the LLC layer packet data packet.
  • the invention pre-sets the packet data packet length of the SNDCP layer, so that the SNDCP layer is no longer restricted by the LLC layer, and the coupling degree between the SNDCP layer and the LLC layer is reduced, so that the layers remain independent. Guaranteed greater flexibility.
  • FIG. 1 is a schematic diagram of a basic network structure of an existing GPRS system
  • FIG. 2 is a schematic structural diagram of a wireless data plane protocol of an existing GPRS system
  • FIG. 3 is a schematic diagram of SNDCP PDU segmentation/reassembly according to the present invention.
  • FIG. 4 is a flowchart of a data segmentation processing method according to Embodiment 1 of the present invention.
  • FIG. 5 is a flowchart of a data reorganization processing method according to Embodiment 2 of the present invention.
  • FIG. 6 is a schematic structural diagram of a segmentation/reassembly processing apparatus according to Embodiment 3 of the present invention. detailed description
  • the main idea of the present invention is to increase the length of the SN PDU (Subnetwork Protocol Data Unit) segment by only the data of the layer by increasing the definition of the layer segment length of the packet data packet of the SNDCP layer. Parameter constraints, but not subject to the reverse constraints of the data parameters of the lower LLC layer.
  • the implementation of the upper layer protocol requires the lower layer to provide corresponding services.
  • the segmentation/reassembly process needs to be performed when the PDU is transmitted between the upper and lower layers.
  • Ethernet and 802.3 have limitations on the length of the protocol data unit when it is transmitted.
  • the maximum values are 1500 bytes and 1492 bytes, respectively. This maximum transmission length is called MTU (Maximum Transmit Unit).
  • the IP layer needs to divide the packet into segments so that each segment is smaller than the MTU. Packet data When passing through a GPRS network, it is also necessary to perform a segmentation/reassembly process between protocol layers.
  • FIG. 4 is a flowchart of an embodiment of a data segmentation processing method according to the present invention, where the specific The data segmentation processing method includes:
  • Step 101 The packet data packet length of the SNDCP layer is set in advance, and the IP packet of the upper layer IP layer is sent to the SNDCP layer; the IP packet is segmented, and each segment of the IP packet is given. Adding the SNDCP header to form a segmented SN PDU message;
  • Step 104 After receiving the segmented SN PDU message, the LLC layer segments the packet according to the length of the packet data of the LLC layer, and adds the LLC prefix to each segment to form a segment LLCPDU packet.
  • the added fields in the SNDCP header in the prior art are different for the answer mode and the non-acknowledge mode (see 3GPP TS 44.065 protocol). As shown in Table 1, for the acknowledge mode, the added fields include: idle bit (X), first segment indicator (F), SN PDU message type.
  • the SNDCP header further includes: a data compression coding field (DCOMP) and Protocol Control Information Compression Coding (PCOMP) field.
  • DCOMP data compression coding field
  • PCOMP Protocol Control Information Compression Coding
  • the SNDCP header further includes: a data compression coding field (DCOMP) and a protocol control information compression coding (PCOMP) field .
  • DCOMP data compression coding field
  • PCOMP protocol control information compression coding
  • the present invention does not need to distinguish between the acknowledge mode and the non-answer mode in the SNDCP header, and the SNPDU packet type field is no longer needed, and a SNDCP header is added to the fragmented SNPDU header.
  • the field SN-PDU LI is used to indicate the length of the packet of this layer.
  • the SNDCP header further includes: a data compression coding field (DCOMP) and a protocol control information compression coding (PCOMP) field.
  • DCOMP data compression coding field
  • PCOMP protocol control information compression coding
  • Table 3 For setting the size of the packet data packet size of the SNDCP layer, since the SNDCP layer is no longer based on the length of the LLC layer packet data, the T field used to indicate the response or no response mode in the SNDCP header is deleted, so the SNDCP layer The packet data length no longer distinguishes between the mode, that is, the acknowledge mode and the no answer mode, so it is recommended that the packet data packet length of the SNDCP layer is greater than or equal to the length of the LLC layer packet data packet.
  • segment length of the LLC layer data is 1520 or 500 in the response and non-answer modes, respectively, and the SNDCP mode is not described above, it is recommended that the segment size of the SN-PDU is not less than 1520, as shown in Table 3, SN.
  • the PDU LI field occupies 11 bits and can indicate a length of 1520 or more.
  • the added header may include: an address field field, a control field field, and a frame check field.
  • FIG. 5 is a flowchart of an embodiment of a data reorganization processing method, where the specific data reassembly processing method includes:
  • Step 201 The LLC header of the segment LLC PDU packet of the LLC layer is removed, and the SN PDU packet is obtained and sent to the upper SNDCP layer.
  • Step 202 Parse the SNDCP header of the SN PDU packet, remove the SNDCP header from each SN PDU packet, obtain an IP data segment, and sort and combine the IP data segments, and the combined size may not exceed the SNDCP layer setting. Packet packet length, the combined IP data segment is an IP packet, and the IP packet is transmitted to the IP layer;
  • Step 203 The IP layer reassembles the received IP packet again. It is also recommended that the packet data packet length of the SNDCP layer be greater than or equal to the length of the LLC layer packet data packet.
  • the IP data segments may be arranged and combined in the following manner: First, the SNDCP header of the received SN PDU packet is parsed, and the sequence number of the packet in the SNDCP prefix is obtained through parsing, and finally according to The obtained message sequence number is arranged and combined with the IP data segments.
  • FIG. 6 is a schematic structural diagram of an embodiment of a data segmentation/reassembly processing device.
  • the device includes: a lower layer transceiver module, an upper layer transceiver module, and a segmentation/reassembly module.
  • the sub-reassembly module is configured to set a packet data packet length of the SNDCP layer, and is configured to receive an IP packet by using an upper layer transceiver module, perform segmentation processing on the IP packet according to the set SNDCP layer packet data packet length, and then send and receive the IP packet through the lower layer.
  • the module is forwarded to the LLC layer. It is also used to receive the SN PDU message through the lower layer transceiver module, reorganize the SN PDU message according to the set SNDCP layer packet length, and then forward it to the IP layer through the upper layer transceiver module.
  • the segmentation/reassembly module for setting the packet data length of the SNDCP layer, the setting of the packet data length of the SNDCP layer is suggested to be greater than or equal to the LLC layer packet data packet length.
  • the protocol layer data segmentation processing method and apparatus of the present invention sets the packet data packet length of the SNDCP layer to segment the IP packet to form a segment SN PDU report segmentation LLC PDU message.
  • the segmented LLC PDU packet of the LLC layer may be removed from the LLC header to obtain an SN PDU packet, and the SNDCP header of each SN PDU packet is parsed to obtain an IP data segment, and the IP data segments are sorted and combined.
  • the IP layer reassembles the combined IP packets.
  • the invention pre-sets the packet data packet length of the SNDCP layer, so that the SNDCP layer is no longer restricted by the LLC layer, and the coupling degree between the SNDCP layer and the LLC layer is reduced, so that the layers remain independent. Guaranteed greater flexibility.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Communication Control (AREA)

Abstract

L'invention concerne un procédé et un dispositif de traitement de segmentation et de recombinaison de données intercouche de protocole, le procédé consistant à : régler la longueur d'un ensemble de données par paquets de couche SNDCP, et segmenter un paquet IP afin de former un paquet de PDU SN segmenté ; segmenter le paquet de PDU SN segmenté conformément à la longueur d'un ensemble de données par paquets de couche LLC de manière à former un paquet de PDU LLC segmenté ; obtenir un paquet de PDU SN après suppression du préfixe LLC du paquet de PDU LLC segmenté de la couche LLC ; analyser le préfixe SNDCP de chaque paquet de PDU SN afin d'obtenir des segments de données IP ; séquencer et combiner les segments de données IP ; et recombiner la couche IP avec le paquet IP combiné. La présente invention prérègle la longueur de l'ensemble de données par paquets de couche SNDCP de telle sorte que la couche SNDCP n'est plus limitée par la couche LLC, et réduit le degré de couplage entre la couche SNDCP et la couche LLC, ce qui maintient l'indépendance de chaque couche et assure une plus grande souplesse.
PCT/CN2012/076101 2011-11-09 2012-05-25 Procédé et dispositif de traitement de segmentation et de recombinaison de données intercouche de protocole WO2013067809A1 (fr)

Applications Claiming Priority (2)

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CN201110351889.4 2011-11-09
CN201110351889.4A CN103108407B (zh) 2011-11-09 2011-11-09 基于gprs系统的协议层间数据分段、重组处理方法和装置

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KR20160085201A (ko) * 2015-01-07 2016-07-15 삼성전자주식회사 송신 장치, 수신 장치 및 그 신호 처리 방법
CN111641565B (zh) * 2019-03-01 2022-05-13 华为技术有限公司 一种以太网报文的传输方法、装置及系统

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