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WO2010108353A1 - Pdu的发送/接收方法和装置 - Google Patents

Pdu的发送/接收方法和装置 Download PDF

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Publication number
WO2010108353A1
WO2010108353A1 PCT/CN2009/073707 CN2009073707W WO2010108353A1 WO 2010108353 A1 WO2010108353 A1 WO 2010108353A1 CN 2009073707 W CN2009073707 W CN 2009073707W WO 2010108353 A1 WO2010108353 A1 WO 2010108353A1
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WO
WIPO (PCT)
Prior art keywords
pdu
rlc
carried
pdus
message
Prior art date
Application number
PCT/CN2009/073707
Other languages
English (en)
French (fr)
Inventor
王坚
Original Assignee
中兴通讯股份有限公司
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Filing date
Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2010108353A1 publication Critical patent/WO2010108353A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic management; Network resource management
    • H04W28/02Traffic management, e.g. flow control or congestion control
    • H04W28/06Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H04W28/065Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information using assembly or disassembly of packets
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1809Selective-repeat protocols

Definitions

  • the present invention relates to the field of communications, and in particular, to a protocol data unit (PDU) transmission
  • PDU protocol data unit
  • LTE Long Term Evolution
  • 3GPP 3rd Generation Partnership Project
  • 3G 3rd Generation
  • OFDM Orthogonal Frequency Division Multiplexing
  • CU Multiple Input Multiple Output
  • the main performance objectives include: providing downlink 100Mbps and uplink 50Mbps peak rate in 20MHz spectrum bandwidth; improving cell edge user performance; increasing cell capacity; reducing system delay; supporting cell coverage of 100km radius; capable of providing 350km/h high-speed mobile users Access services greater than 100 kbps; support for paired or unpaired frequency, and flexible configuration of bandwidth.
  • the LTE air interface protocol (that is, the radio access protocol) mainly includes a user plane protocol and a control plane protocol.
  • the user equipment User Equipment, called UE
  • the evolved base station evolved NodeB, called eNB
  • the protocol on the user side includes a physical layer (L1), a medium access control layer (Media Access Control, a cartridge called MAC), a radio link control layer (Radio link control, a cylinder called RLC), and packet data.
  • L1 physical layer
  • MAC medium access control layer
  • Radio link control layer Radio link control, a cylinder called RLC
  • the Packet Data Convergence Protocol (PDCP), the Internet Protocol (IP) layer, and the control plane protocol are mainly wireless control protocols.
  • PDCP is mainly used for compression and force of data and signaling.
  • each PDCP Service Data Unit is associated with a count value, which is one of the parameters in the compression and decompression of PDCP and needs to be provided to Each PDCP SDU wastes a lot of air interface resources.
  • the LTE specification adopts the method of setting the above count value to 32-bit COUNT.
  • the COUNT is divided into two parts, and the upper part is called a Hyper Frame Number (the HFN), and the ⁇ part is called
  • the HFN is used as a variable to maintain at both ends of the communication
  • the PDCP SN is stored as a field. It lies in the head of the PDCP.
  • the PDCP PDUs are Signal Radio Bearing (SRB) and Acknowledgement Mode (AM), Data Radio Bearing (DRB) and Unacknowledged Mode ( Unacknowledgement Mode, the cartridge is called UM) DRB.
  • SRB Signal Radio Bearing
  • AM Data Radio Bearing
  • UM DRB the PDCP SN is 7 bits or 12 bits in length, plus data/control (D/C).
  • D/C data/control
  • the ID and reserved fields occupy 2 bytes, as shown in Figure 2b:
  • AM DRB the PDCP SN is 12 bits long, plus the D/C identifier and reserved fields, occupying 2 bytes, as shown in Figure 2c.
  • the main object of the present invention is to provide a PDU transmission.
  • the method and the receiving method solve the above problems in the related art. According to an aspect of the present invention, a method of transmitting a PDU is provided.
  • the method for transmitting a PDU includes: the RLC of the sender receives a plurality of PDUs from the PDCP, wherein each of the plurality of PDUs includes: data information and header information including the SN;
  • the plurality of PDUs are carried in one or more RLC messages, wherein the SNs of the PDUs carried in each RLC 4 are consecutive, and each RLC 4 carries only one SN of the PDU; the RLC takes the above one or Multiple RLC 4 messages are sent to the recipient.
  • a method of receiving a PDU is provided.
  • the receiving method of the PDU according to the present invention includes: the RLC of the receiving party receives a plurality of consecutive RLCs from the sender, wherein each RLC 4 carries an SN of the PDU and at least one PDU.
  • Each PDU includes: data information and header information that does not include the SN; the RLC parses the received multiple RLC messages, and obtains the SN carried in each RLC message and the data information of each PDU and the header that does not include the SN.
  • a transmitting apparatus for a PDU includes: a receiving module, a configuration module, and a transmitting module.
  • the receiving module is configured to receive a plurality of consecutive PDUs from the PDCP, where each of the multiple PDUs carries: data information and header information including an SN;
  • the PDU is carried in one or more RLCs, wherein the SNs of the PDUs carried in each RLC packet are consecutive, and each RLC 4 carries only one SN of the PDU;
  • a sending module is used to One or more RLC messages are sent to the receiver.
  • a receiving apparatus for a PDU is provided.
  • the receiving apparatus of the PDU includes: a receiving module, a parsing module, an obtaining module, and
  • the modulating module is configured to receive, by the receiving module, a plurality of consecutive RLC messages from the sender, where each RLC 4 ⁇ carries an SN of one PDU, and at least one PDU, where each PDU includes: The data information and the header information that does not include the SN;
  • the parsing module is configured to parse the plurality of consecutive RLC messages received by the receiving module, and obtain the SNs carried in the RLC messages and the data signals of the PDUs in each RLC message.
  • the obtaining module configured to obtain, according to the parsing result of the parsing module, the SN of each PDU carried in each RLC packet according to the SN carried in each RLC packet; And combining the SN of each PDU obtained by the obtaining module into the data information of the PDU and the header information not including the SN to obtain one PDCP PDU.
  • the problem of causing load on the air interface can reduce the load on the air interface during the transmission of the PDCP PDU, thereby reducing the system resources occupied by the PDU transmission and improving the transmission efficiency of the PDCP PDU.
  • FIG. 1 is a schematic structural diagram of an LTE radio access network in the related art
  • FIG. 2 is a schematic structural diagram of a PDCP PDU being an SRB in the related art
  • FIG. 2b is a schematic structural diagram of a PDCP PDU being an AM DRB in the related art
  • 2c is a schematic diagram of a structure in which a PDCP PDU is a UM DRB in the related art
  • FIG. 3 is a flow chart of a method for transmitting a PDU according to Embodiment 1 of the present invention
  • FIG. 4a is an RLC 4 file in an embodiment of the method of the present invention
  • FIG. 4 is a schematic structural diagram of another RLC 4 according to an embodiment of the method of the present invention
  • FIG. 5 is a structural block diagram of a transmitting apparatus of a PDU according to Embodiment 1 of the present invention
  • FIG. 7 is a structural block diagram of a receiving apparatus for a PDU according to Embodiment 2 of the apparatus of the present invention.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The SN of a continuous multiple PDCP PDU is continuous in the embodiment of the present invention, considering the problem that the SN carrying the PDCP PDU is transmitted when each PDCP PDU is transmitted in the related art, thereby causing a load on the air interface.
  • the RLC of the sender when transmitting the PDUs to the sender, the RLC carries the multiple PDCP PDUs in one or more RLCs, where For each RLC 4, the SN of the PDCP PDU carried in the 4 ⁇ ⁇ , , , , , , , , , , , , , , , , , , , PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD PD
  • the SNs of the other PDCP PDUs carried in the RLC 4 ⁇ are obtained according to the SN of the PDCP PDU carried in the RLC 4 ⁇ .
  • FIG. 3 is a flowchart of a method for transmitting a PDU according to Embodiment 1 of the method of the present invention. As shown in FIG.
  • a method for transmitting a PDU according to Embodiment 1 of the present invention mainly includes the following steps (Step S302 - Step S306): Step S302, the RLC of the sender receives a plurality of consecutive PDUs from the PDCP, where each of the multiple PDUs carries: data information of the PDU and header information of the SN including the PDU; Step S304, the RLC carries the foregoing PDUs in one or more RLCs, where the SNs of the PDUs carried in each RLC message are connected, and only one SN of the PDU is carried in each RLC message; S306.
  • the RLC sends the one or more RLC messages to the receiver.
  • the header may be carried in the header of each of the one or more RLCs
  • the content information length information of each PDU carried in the RLC message according to the length information, the location of the content information of each PDU in the RLC message.
  • the receiver After receiving the one or more RLC messages sent by the RLC of the sender, the receiver parses out the SN of the first PDU carried in each RLC 4 message from the received one or more RLCs. And the content information of each PDU, and according to the SN of the first PDU carried in the RLC 4, obtain the SN of each PDU carried in the RLC 4, and combine the content information of each PDU and its corresponding SN. Details of each of the above processes are further explained below.
  • the sender may be both parties of the wireless communication, and correspondingly, the receiver may also be both sides of the wireless communication, that is, when the sender is a mobile terminal, the receiver is a base station or a relay station, and the sender When it is a base station or a relay station, the receiver is a mobile terminal.
  • the PDCP layer of the sender receives the upper layer PDCP SDU, it generates a PDCP SN for the PDCP SDU, and uses the SN as a parameter to perform encryption and integrity protection on the PDCP SDU to generate a PDU.
  • the PDCP SDU is encrypted and complete.
  • Sexual protection includes but is not limited to: Encryption and integrity protection of the SDU carrying the signaling, and encryption protection of the SDU loading the data. Then, the sender's PDCP sends multiple PDUs to the sent RLC, where the SNs of some of the PDUs may be consecutive.
  • the RLC carries the plurality of PDUs in one or more RLCs according to the transmission capacity of the logical channel and the SN of the plurality of PDUs. Specifically, the RLC carries the multiple PDUs.
  • Step 1 The RLC obtains the transmission capacity C of the current logical channel from the MAC layer.
  • Step 2 The RLC determines whether the transmission capacity L of the multiple PDUs is less than or equal to the transmission capacity C. If yes, go to step 3. Otherwise, go to step 5.
  • the transmission capacity L of the plurality of PDUs refers to the capacity of the SNs of the PDUs in which the plurality of SNs are connected, for example, if the SNs of the multiple PDUs are: 1, 2, 3, 5, 6, 7.
  • the transmission capacity L of the six PDUs is: the data information of the PDU with the SN being 1 and the capacity of the header information including the SN, the data information of the PDU with the SN 2, and the capacity of the header information not including the SN, and the SN is The data information of the PDU of 3 and the capacity of the header information not including the SN, the data information of the PDU having the SN of 5, the capacity of the header information including the SN, the data information of the PDU having the SN of 6, and the capacity of the header information not including the SN.
  • Step 3 The RLC groups the multiple PDUs according to their SNs, where the SNs of the PDUs of each group are consecutive, and the SN of the PDUs between the groups is non-connected;
  • Step 4 The RLC carries each group of PDUs in an RLC message of the current subframe, and performs step S306.
  • Step 5 The RLC captures one or more RLCs of the multiple PDUs carried in at least two subframes.
  • Step 5.1 sequentially acquire, in the foregoing multiple PDUs, a data part with a transmission capacity C of being carried in one or more RLC messages of the current subframe, where the data is If there are SN consecutive PDUs in the PDUs that are partially included, the SN-connected PDUs are carried in one RLC 4 ,. Therefore, the SNs of the PDUs carried in one or more RLC messages in the current subframe are consecutive.
  • Step 5.2 Obtaining the current transmission capacity E of the current logical channel, determining whether the transmission capacity of the remaining data part of the multiple PDUs is less than or equal to E, and if yes, performing step 5.3, otherwise, performing Step 5.4: Step 5.3: The remaining data part of the foregoing multiple PDUs is carried in one or more RLC messages in the next subframe of the current subframe, and the specific carrying manner is the same as that in step 5.1 above.
  • Step 306 Step 5.4: sequentially acquire a data portion of the data portion of the plurality of PDUs that has a transmission capacity of E, and carry the data portion in one of the next subframes of the current subframe.
  • the specific carrying mode of the multiple RLC packets is the same as that in the foregoing step 5.1, and is not mentioned here.
  • Step 5.5 The next subframe of the current subframe is used as the current subframe, and the process returns to step 5.2.
  • the first PDU to be carried in the RLC message contains its data information and header information, that is, the first one carried If the PDU is complete, the header information and the data information of the PDU are carried in the RLC message, and the data information of other PDUs that are consecutive to the SN of the PDU and the header information that does not include the SN are carried in the RLC message; If the first PDU to be carried in the RLC packet is incomplete, that is, only part of the data of the PDU is carried, the part of the data included in the PDU is carried in the RLC message, and the SN of the PDU is The header information and data information of the connected next PDU are carried in the RLC message.
  • the data information of other PDUs in the RLC 4 and the header information not including the SN are carried in the RLC.
  • the SN carried in the RLC message may also be the SN of the first PDU.
  • the length information of each PDU carried in the RLC message may be carried in the header of the RLC message, and the receiver may parse the RLC message according to the length information.
  • Figure 4a shows the structure of an RLC 4 message.
  • the N PDCP PDUs are carried in the SDUs of the N RLCs, and each The RLC carries only the SN of the first PDCP PDU.
  • Figure 4b shows the structure of another RLC message.
  • the RLC 4 in addition to the header in the RLC 4, in this structure, the RLC 4 carries only the SN of the second PDCP PDU.
  • the first transmission identifier and the second transmission identifier may be further configured in the header of each of the one or more RLCs, where the first transmission identifier is used to indicate that the RLC is carried in the text.
  • the first transmission identifier and the second transmission identifier may be identified by using a 2-bit field FI in the header of the RLC 4, where the first bit identifies the first transmission identifier, and when the first bit is 1, the RLC report is indicated.
  • the content information of the first PDU carried in the text is complete.
  • the first bit is 0, the content information of the first PDU carried in the RLC message is incomplete; the second bit identifies the second transmission identifier.
  • the second bit When the second bit is 1, the content information of the last PDU carried in the RLC 4 message is complete, and when the second bit is 0, the content information of the last PDU carried in the RLC ⁇ t message is incomplete.
  • the SN of the PDCP PDU For a PDCP PDU that does not need to carry the SN in the RLC 4, the SN of the PDCP PDU is deleted.
  • the PDCP PDUs are classified into three types, namely, the SRB, the AM DRB, and the UM DRB. Therefore, the data information of the PDCP PDU and the header information not including the SN are carried in the RLC message for the three types of PDCP PDUs.
  • the method can be specifically divided into the following three types: First, as shown in FIG.
  • the SN occupies a single byte, and the content of the PDCP PDU can be directly carried in the RLC after the byte is directly deleted.
  • the SN and the data/control (D/C) identifier share a byte, and the byte can be reserved, but the reserved SN is on the receiving side.
  • the length of the SN is 12 bits, and the D/C identifier shares 2 bytes, which can be reserved for the high byte including the DC identifier, including The lower byte of the SN is deleted, and the content information of the PDCP PDU after the lower byte is deleted is carried in the RLC 4 message.
  • the technical solution provided in this embodiment when a plurality of consecutive PDCP PDUs are transmitted, only the SN of the first PDCP PDU carried in the packet is carried in the RLC message, so that transmission during the transmission of the PDU can be avoided. Redundant SN, which reduces the load on the air interface.
  • the sending of the PDU may include the following steps 1 to 7: Step 1
  • the PDCP layer of the UE receives consecutive multiple PDCP PDUs from the non-access stratum, and the PDCP layer generates one PDCP SN for each PDCP SDU, and the PDCP SN is used to force each PDCP PDU.
  • Step 2 The RLC layer receives the carried SN delivered by the PDCP layer. Multiple consecutive PDCP
  • Step 2 corresponds to the above step S302;
  • Step 3 the RLC acquires the transmission capacity C of the current logical channel from the MAC layer;
  • Step 4 determines whether the transmission capacity L of the plurality of PDCP PDUs is less than or equal to the transmission capacity C, if Then, step 5 is performed; otherwise, step 7 is performed;
  • step 5 the RLC groups the plurality of PDUs according to their SNs, wherein the SNs of the PDUs of each group are consecutive, and the SN of the PDUs between the groups is non-connected;
  • 6 The RLC carries each of the foregoing PDCP PDUs in an RLC 4 of the current subframe, and performs Step 13;
  • Step 7 The RLC sequentially acquires, in the foregoing multiple PDUs, the data part with the transmission capacity C is carried in one of the current subframes.
  • the data part includes a plurality of PDUs having SN consecutive PDUs, the SN-connected PDUs are carried in an RLC 4, because jib, and, in the current subframe
  • the SN of the PDU carried in one or more RLCs is continuous, and the SN of the PDU carried between each RLC 4 ⁇
  • the PDUs of the data part are carried in an RLC message; Step 9, the RLC is in the next subframe of the current subframe, Obtaining the current transmission capacity of the logical channel, determining whether the transmission capacity of the remaining data portions of the plurality of PDUs is less than or equal to ⁇ , and if yes, performing step 10; otherwise, performing step 11;
  • the remaining data part of the PDU is carried in one or more RLCs of the next subframe of the current subframe, and step 13 is performed.
  • Step 11 sequentially acquiring the remaining data portion of the plurality of PDUs with a transmission capacity of ⁇
  • the data part, the data part is carried in one or more RLCs of the next subframe of the current subframe;
  • Step 12 the next subframe of the current subframe is used as the current subframe, and the process returns to step 9;
  • the above step 5 - step 12 corresponds to the above step S304.
  • Step 13 Send the RLC 4 message to the receiver (for example, a base station or a relay station).
  • Step 13 corresponds to the above step S306.
  • the process of the foregoing steps 1 to 13 can be applied to a scenario in which a normal connection between the UE and the base station is established, and can also be applied to a scenario in which the UE performs handover of the base station, and the process can only transmit multiple consecutive PDCP PDUs.
  • the RLC 4 carries the SN of the first PDCP PDU, thereby reducing the air interface load.
  • a PDU sending apparatus is provided.
  • the PDU sending method provided in Embodiment 1 of the foregoing method may be used on the apparatus.
  • FIG. 5 shows a structure of a transmitting device of a PDU according to an embodiment of the present invention. As shown in FIG.
  • a transmitting device for a PDU includes: a receiving module 1, a configuration module 3, and a sending module. 5.
  • the functions of each of the above modules are further described below.
  • the receiving module 1 is configured to receive a plurality of consecutive PDUs from the PDCP, where each of the plurality of PDUs carries: data information and header information including a sequence number SN; preferably, the receiving module 1 can perform the foregoing Step S302;
  • the configuration module 3 is connected to the receiving module 1 and configured to carry the foregoing PDUs received by the receiving module 1 in one or more RLCs, wherein the SNs of the PDUs carried in each RLC 4 are consecutive, and each The RLC packet carries only one SN of the PDU; preferably, the configuration module 3 can perform the above step S304;
  • the sending module 5 is connected to the configuration module 3, and is configured to send one or more RLC messages to the receiver.
  • FIG. 6 is a flowchart of a method for receiving a PDU according to Embodiment 2 of the method of the present invention. As shown in FIG. 6, the method for receiving a PDU according to Embodiment 2 of the method of the present invention mainly includes the following steps (Step S602).
  • Step S608 Step S602: The RLC of the receiver receives multiple consecutive RLCs from the sender, where each RLC 4 carries an SN of one PDU and at least one PDU, and each PDU includes The data information and the header information that does not include the SN; Step S604, the RLC parses the received multiple RLC messages, and obtains the SN and the data information of each PDU carried in each RLC message and the header information not including the SN; Step S606 The RLC obtains the SNs of the PDUs carried in the respective RLCs according to the SNs carried in the respective RLCs. In step S608, the SNs of the PUDs are combined into the data information of the PDU and the header information not including the SN.
  • the receiver's RLC can also send each PDCP PDU to the PDCP layer.
  • the header of the received RLC message may also carry each PDU. Length information, a first transmission identifier, and a second transmission identifier, where the first transmission identifier is used to indicate whether the first PDU carried in the RLC packet is complete, that is, whether all data information of the PDU is carried and not included
  • the first information of the SN is used to indicate whether the last PDU carried in the RLC 4 is complete.
  • the data information of the at least one PDU and the header information not including the SN are obtained from the RLC message according to the length information of each PDU in the RLC.
  • the SN of each PDU that is located before the PDU corresponding to the SN that is obtained by the SN is decremented according to the SN that is obtained by parsing, and the SN after the PDU corresponding to the SN that is obtained by the parsing is obtained.
  • the SNs obtained according to the parsing are sequentially incremented. .
  • the data information of the acquired PDU and the header information are combined with the corresponding SN, that is, the SN is written into the header information of the PDU to become a complete PDU.
  • the current data is The SN of the RLC 4 ⁇ ⁇ finds the last RLC 4 ⁇ of the current RLC 4 , if the second RRC of the last RLC 4 ⁇ indicates that the last PDU carried therein is incomplete (eg, the second field of the FI field)
  • the bit of the last PDU carried in the previous RLC 4 is the same as the SN of the first PDU carried in the current RLC 4, and the first PDU of the current RLC 4
  • the SN of the PDCP PDU and the data of the at least one PDCP PDU of the PDCP PDU can be parsed from the multiple RLC messages from the sender, and the corresponding PDCP PDUs are obtained according to the SN.
  • the SN combines the PDCP PDU data and its corresponding SN to obtain a complete PDCP PDU.
  • the following takes the user equipment (UE) as the receiving end as an example, and specifically describes the implementation according to the method of the present invention.
  • Step 1 The RLC layer of the UE receives the RLC message of the MAC layer; Step 1 corresponds to the foregoing Step S602; Step 2, the RLC parses the RLC 4 message, from the RLC 4 Acquiring the SN corresponding to the first PDU, obtaining the length information of each PDU content information from the packet header, and obtaining the first transmission identifier and the second transmission identifier from the FI word; Step 2 corresponds to the foregoing step S604; Step 3 The RLC reads the data information of each PDU and the header information not including the SN from the RLC 4 according to the length information of each PDU; Step 3 corresponds to the above step S606; Step 4, the RLC determines the first of the FI field.
  • Step 5 the data information and the header information of the first PDU carried by the RLC message are obtained from the RLC message. (including SN); Step 6, the RLC sequentially combines the content information of the first PDU and the last PDU PDU and its SN to obtain a complete PDU; Step 7, the RLC determines whether the second bit of the FI field is 1 , if it is 1, the process proceeds to step 8, if it is 0 Then, the process proceeds to step 9.
  • step 8 the RLC combines the data information of the last PDU with the header information not including the SN and its corresponding SN to obtain the complete last PDU, and performs step 13; Step 9, RLC According to the SN of the current RLC 4, the next RLC 4 message is found; Step 10, it is judged whether the first bit of the FI field of the next RLC message is 0, and if it is 0, the process proceeds to step 11.
  • Step 11 the RLC obtains the data information and the header information of the first PDU from the next RLC message;
  • Step 12 the RLC associates the SN of the current PDU with the last PDU of the current RLC message, and the last one Combining the data of the PDU and the data of the first PDU in the next RLC message to obtain the complete last PDU;
  • Step 4 to Step 12 correspond to the above step S608;
  • Step 13 Send the combined PDU to the PDCP layer.
  • the PDCP layer decrypts and integrity verifies the PDCP PDU according to the received SN of the PDCP.
  • the data of the SN of the one PDCP PDU and the data of the at least one PDCP PDU are parsed from the plurality of RLCs of the sender, and the data corresponding to the remaining PDCP PDUs are obtained according to the SN.
  • the SN combines the data of the PDCP PDU and its corresponding SN to obtain a complete PDCP PDU.
  • Apparatus Embodiment 2 a receiving apparatus for a PDU is provided, and a receiving apparatus of the PDU may be used in conjunction with a sending apparatus of the PDU, and the receiving apparatus may be used to implement the second embodiment of the method of the present invention. The method of receiving the PDU.
  • FIG. 7 is a diagram showing the structure of a receiving device for a PDU according to a second embodiment of the present invention.
  • the receiving device for the PDU according to the second embodiment of the present invention includes: a receiving module 2, a parsing module 4, and an obtaining module. 6 and combination module 8.
  • the receiving module 2 is configured to receive multiple consecutive RLC messages from the sender, where each RLC 4 carries an SN of one PDU, and data information of at least one PDU and a header that does not include the SN.
  • the receiving module 2 is configured to perform the foregoing step S602;
  • the parsing module 4 is connected to the receiving module 2, and is configured to parse the plurality of consecutive RLC messages received by the receiving module 2, and obtain the information carried in each RLC message.
  • the SN and the data information of each PDU and the header information of the SN are not included; preferably, the parsing module 4 is configured to perform the above step S604; the obtaining module 6 is connected to the parsing module 4, and is configured to parse the result by the parsing module 4 Obtaining, according to the SN carried in each RLC message, the SN of each PDU carried in each RLC message; preferably, the obtaining module 6 is configured to perform the foregoing step S606; the combining module 8 is connected to the parsing module 4 and the obtaining module 6.
  • the SN of each PDU acquired by the obtaining module 6 is combined with the data information of each PDU acquired by the parsing module 4 and the header information not including the SN to obtain one PDCP PDU.
  • the combination module 8 is operative to perform the above step S608.
  • the receiving device of the PDU provided by the embodiment can obtain the data of the SN of the one PDCP PDU and the data of the at least one PDCP PDU from the multiple RLC messages from the sender, and obtain the corresponding PDCP PDU according to the SN.
  • SN will PDCP PDU data and its The corresponding SNs are combined to obtain a complete PDCP PDU.
  • the SN can solve the problem that the SN carrying the PDCP PDU is transmitted when each PDCP PDU is transmitted in the related art, thereby causing a load on the air interface, and reducing the load on the air interface during the process of transmitting the PDCP PDU, thereby reducing the occupied system. Resources, improve the transmission efficiency of PDCP PDUs.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

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Description

PDU的发送 /接收方法和装置
技术领域 本发明涉及通信领域, 具体地, 涉及一种协议数据单元(PDU )的发送
/接收方法和装置。 背景技术 长期演进(Long Term Evolution, 筒称为 LTE )是第三代合作伙伴计划 ( 3rd Generation Partnership Project, 筒称为 3GPP ) 的最新无线通信系统, 该系统改进并增强了第三代移动通信技术 (3rd Generation, 筒称为 3G ) 的 空中接入技术。 LTE中采用正交频分复用技术( Orthogonal Frequency Division Multiplexing,筒称为 OFDM )和多输入多输出( Multiple Input Multiple Output , 筒称为 ΜΙΜΟ )作为其无线网络演进的基础性技术, LTE中的主要性能目标 包括: 在 20MHz频谱带宽提供下行 100Mbps、 上行 50Mbps的峰值速率; 改 善小区边缘用户的性能; 提高小区容量; 降低系统延迟; 支持 100km半径的 小区覆盖; 能够为 350km/h高速移动用户提供大于 100kbps的接入服务; 支 持成对或非成对频 i普, 并可灵活配置带宽等。
LTE空口协议(即无线接入协议) 主要包括用户面协议和控制面协议, 如图 1所示 ,在用户设备( User Equipment,筒称为 UE )和演进型基站( evolved NodeB , 筒称为 eNB )内均存在。 在图 1中, 用户侧的协议包括物理层( L1 )、 媒体接入控制层 (Media Access Control, 筒称为 MAC )、 无线链路控制层 ( Radio link Control , 筒称为 RLC )、 分组数据汇聚十办议 ( Packet Data Convergence Protocol , 筒称为 PDCP )、 网络十办议 ( Internet Protocol , 筒称为 IP ) 层, 控制面协议主要为无线控制协议。 其中, PDCP 主要用于数据和信 令的压缩、力。密和完整性保护,每个 PDCP月 务数据单元( Service Data Unit, 筒称为 SDU )都与一个计数值相联系 , 而该计数值作为 PDCP的压缩和解压 缩中的参数之一 , 需要提供给每个 PDCP SDU , 这样浪费了大量的空口资源。 为了减少空口负担, LTE规范采用的方法是将上述计数值定为 32位的 COUNT, COUNT分为两部分, 高位部分称为超帧号(Hyper Frame Number, 筒称为 HFN ), 氐位部分称为 PDCP序列号( Sequence Number, 筒称为 SN ), HFN作为一个变量, 在通信两端进行维护, 而 PDCP SN则作为一个字段存 在于 PDCP 的 4艮文头部 ( Header ) 内。 PDCP 的 PDU分别为信令无线 载 ( Signal Radio Bearing, 筒称为 SRB )和确认模式 ( Acknowledgement Mode, 筒称为 AM ) 的数据无线 载 ( Data Radio Bearing, 筒称为 DRB )和非确认 模式(Unacknowledgement Mode, 筒称为 UM ) DRB。 对于 SRB, PDCP SN 长度为 5bit,加上 3个保留字段,占有 1个字节,如图 2a所示;对于 UM DRB, PDCP SN长度为 7bit或者 12bit, 加上数据 /控制 ( D/C ) 标识和保留字段, 占用 2个字节, 如图 2b所示: 对于 AM DRB, PDCP SN长度为 12bit, 加上 D/C标识和保留字段, 占用 2个字节,如图 2c所示。但是, 由于每一个 PDCP PDU都携带一个 SN,这些 SN是可以相互推导的,因此在传输大量 PDCP PDU 时, 这种携带 SN的 PDCP PDU的冗余的传输方法给空口造成了负荷。 发明内容 考虑到相关技术中存在的传输每个 PDCP PDU时携带该 PDCP PDU的 SN, 从而对空口造成负荷的问题而做出本发明, 为此, 本发明的主要目的在 于提供一种 PDU的发送方法和接收方法, 以解决相关技术中的上述问题。 根据本发明的一个方面, 提供了一种 PDU的发送方法。 才艮据本发明的 PDU的发送方法包括: 发送方的 RLC接收到来自 PDCP 的多个 PDU , 其中, 该多个 PDU中的各个 PDU中均包括: 数据信息和包括 SN的首部信息; RLC将上述多个 PDU携带在一个或多个 RLC报文中, 其 中, 每个 RLC 4艮文中携带的 PDU的 SN连续, 且每个 RLC 4艮文中只携带了 一个 PDU的 SN; RLC将上述一个或多个 RLC 4艮文发送给接收方。 才艮据本发明的另一个方面, 提供了一种 PDU的接收方法。 才艮据本发明的 PDU的接收方法包括:接收方的 RLC接收到来自发送方 的多个连续的 RLC 4艮文, 其中, 各个 RLC 4艮文中携带有一个 PDU的 SN、 和至少一个 PDU, 其中, 每个 PDU包括: 数据信息和不包括 SN的首部信 息; RLC解析接收到的上述多个 RLC报文,获取各个 RLC报文中携带的 SN 以及各个 PDU的数据信息和不包括 SN的首部信息; RLC根据各个 RLC报 文中携带的 SN , 获取各个 RLC 4艮文中携带的各个 PDU的 SN; 将各个 PDU 的 SN组合到该 PDU的数据信息和不包括 SN的首部信息中得到一个 PDCP PDU。 才艮据本发明的另一个方面, 提供了一种 PDU的发送装置。 根据本发明的 PDU的发送装置包括: 接收模块、 配置模块和发送模块。 其中 , 接收模块 , 用于接收来自 PDCP的连续的多个 PDU, 其中, 上述多个 PDU中的各个 PDU中均携带有: 数据信息和包括 SN的首部信息; 配置模 块, 用于将上述多个 PDU携带在一个或多个 RLC "¾文中, 其中, 每个 RLC •t艮文中携带的 PDU的 SN连续, 且每个 RLC 4艮文中只携带了一个 PDU的 SN; 发送模块, 用于将上述一个或多个 RLC报文发送给接收方。 才艮据本发明的再一个方面 , 提供了一种 PDU的接收装置。 根据本发明的 PDU的接收装置包括: 接收模块、 解析模块、 获取模块 和组合模块。 其中 , 接收模块 , 用于接收到来自发送方的多个连续的 RLC报 文, 其中, 各个 RLC 4艮文中携带有一个 PDU的 SN、 和至少一个 PDU, 其 中, 每个 PDU包括: 数据信息和不包括 SN的首部信息; 解析模块, 用于解 析接收模块接收到的多个连续的 RLC报文,获取各个 RLC报文中携带的 SN 以及各个 PDU的数据信息和不包括 SN的首部信息; 获取模块, 用于根据解 析模块的解析结果,根据各个 RLC报文中携带的所述 SN , 获取各个 RLC报 文中携带的各个 PDU的 SN; 组合模块, 用于将获取模块获取到的每个 PDU 的 SN组合到该 PDU的数据信息和不包括 SN的首部信息中得到一个 PDCP PDU。 通过本发明的上述技术方案, 通过在一个 RLC 4艮文中携带多个连续的 PDCP PDU, 并且 , 在每个 RLC 4艮文只携带多个连续的 PDCP PDU中的一个 PDCP PDU的 SN, 从而可以解决相关技术中存在的传输每个 PDCP PDU时 均携带该 PDCP PDU 的 SN, 进而对空口造成负荷的问题, 能够减小传输 PDCP PDU的过程中给空口造成的负荷, 进而减少 PDU传输时占用的系统 资源、 提高 PDCP PDU的传输效率。 本发明的其它特征和优点将在随后的说明书中阐述, 并且, 部分地从说 明书中变得显而易见, 或者通过实施本发明而了解。 本发明的目的和其他优 点可通过在所写的说明书、 权利要求书、 以及附图中所特别指出的结构来实 现和获得。 附图说明 此处所说明的附图用来提供对本发明的进一步理解 ,构成本申请的一部 分, 本发明的示意性实施例及其说明用于解释本发明, 并不构成对本发明的 不当限定。 在附图中: 图 1是相关技术中 LTE无线接入网体系结构示意图; 图 2a是相关技术中 PDCP PDU为 SRB的结构示意图; 图 2b是相关技术中 PDCP PDU为 AM DRB的结构示意图; 图 2c是相关技术中 PDCP PDU为 UM DRB的结构示意图; 图 3是才艮据本发明方法实施例一的 PDU的发送方法的流程; 图 4a是 居本发明方法实施例的一种 RLC 4艮文的结构示意图; 图 4b是根据本发明方法实施例的另一种 RLC 4艮文的结构示意图; 图 5是才艮据本发明装置实施例一的 PDU的发送装置的结构框图; 图 6是才艮据本发明方法实施例二的 PDU的接收方法的流程图; 图 7是根据本发明装置实施例二的 PDU的接收装置的结构框图。 具体实施方式 功能相克述 考虑到相关技术中存在的传输每个 PDCP PDU时携带该 PDCP PDU的 SN, 从而对空口造成负荷的问题, 本发明实施例从连续的多个 PDCP PDU 中的 SN是连续递增的特点出发 ,发送方的 RLC在接收到来自 PDCP 的连接 的多个 PDU时, 在将这些 PDU传输给发送方时, RLC将多个 PDCP PDU携 带在一个或多个 RLC 4艮文中, 其中, 对于每个 RLC 4艮文, 在该 RLC 4艮文中 仅携带该 4艮文中携带的一个 PDCP PDU 的 SN, 对于该 4艮文中携带的其它 PDCP PDU, 则只携带这些 PDCP PDU的数据信息和不包括 SN的首部信息, 由于这些 PDCP PDU是连续的, 因此,才艮据该 RLC 4艮文中携带的 PDCP PDU 的 SN , 可以获取该 RLC 4艮文中携带的其它 PDCP PDU的 SN。 需要说明的是, 如果不冲突, 本发明实施例以及实施例中的各个特征可 以相互结合, 均在本发明的保护范围之内。 下面结合附图对本发明的实施例进行说明 , 应当理解 , 此处所描述的优 选实施例仅用于说明和解释本发明, 并不用于限定本发明。 需要说明的是, 在附图的流程图示出的步骤可以在诸如一组计算机可执行指令的计算机系统 中执行, 并且, 虽然在流程图中示出了逻辑顺序, 但是在某些情况下, 可以 以不同于此处的顺序执行所示出或描述的步骤。 方法实施例一 根据本发明实施例, 首先提供了一种 PDU的发送方法。 图 3中示出了才艮据本发明方法实施例一的 PDU的发送方法的流程 , 如 图 3所示, 根据本发明方法实施例一的 PDU的发送方法主要包括以下步骤 (步骤 S302 -步骤 S306 ): 步骤 S302 , 发送方的 RLC收到来自 PDCP的连续的多个 PDU , 其中, 多个 PDU中的各个 PDU中均携带有: 该 PDU的数据信息和包括该 PDU的 SN的首部信息; 步骤 S304, RLC将上述各个 PDU携带在一个或多个 RLC 4艮文中, 其 中, 每个 RLC报文中携带的 PDU的 SN连接, 且每个 RLC报文中只携带了 一个 PDU的 SN; 步骤 S306 , RLC将上述一个或多个 RLC报文发送给接收方。 优选地,可以在一个或多个 RLC 4艮文中的每个 RLC 4艮文的头部携带该
RLC报文中携带的各个 PDU的内容信息长度信息, 根据该长度信息可以定 位各个 PDU的内容信息在该 RLC报文中的位置。 接收方在接收到发送方的 RLC发送的上述一个或多个 RLC 4艮文之后 , 从接收到的一个或多个 RLC 4艮文中解析出每个 RLC 4艮文中携带的第一个 PDU的 SN和各个 PDU的内容信息 , 并才艮据 RLC 4艮文中携带的第一个 PDU 的 SN, 获取 RLC 4艮文中携带的各个 PDU的 SN, 对各个 PDU的内容信息 及其相应的 SN进行组合。 下面进一步说明上述各处理的细节。
(一) 步骤 S302 在具体应用中, 发送方可以是无线通信的双方, 相应地, 接收方也可以 是无线通信的双方, 即, 发送方是移动终端时, 接收方是基站或中继站, 发 送方是基站或中继站时, 接收方是移动终端。 发送方的 PDCP层在接收到上层 PDCP SDU时, 为该 PDCP SDU生成 一个 PDCP SN, 以该 SN作为参数, 对 PDCP SDU进行加密和完整性保护生 成 PDU, 具体地, 对 PDCP SDU进行加密和完整性保护包括但不限于: 对 承载信令的 SDU进行加密和完整性保护、对加载数据的 SDU进行加密保护。 然后 , 发送方的 PDCP向发送的 RLC发送多个 PDU, 其中, 这部分 PDU中 可能有部分 PDU的 SN是连续的。
(二) 步骤 S304 在具体应用中 , RLC才艮据逻辑信道的传输容量及多个 PDU的 SN, 将 多个 PDU携带在一个或多个 RLC 4艮文中, 具体地, RLC将多个 PDU携带
步骤 1 , RLC从 MAC层获取当前逻辑信道的传输容量 C; 步骤 2, RLC判断上述多个 PDU的传输容量 L是否小于或等于上述传 输容量 C, 如果是, 则执行步骤 3 , 否则执行步骤 5; 其中, 多个 PDU的传输容量 L是指多个 PDU中删除多个 SN连接的 PDU的 SN后的容量, 比如, 如果多个 PDU的 SN分别为: 1、 2、 3、 5、 6、 7, 则这 6个 PDU的传输容量 L为: SN为 1的 PDU的数据信息和包含 SN 的首部信息的容量、 SN为 2的 PDU的数据信息和不包含 SN的首部信息的 容量、 SN为 3的 PDU的数据信息和不包含 SN的首部信息的容量、 SN为 5 的 PDU的数据信息和包含 SN的首部信息的容量、 SN为 6的 PDU的数据信 息和不包含 SN的首部信息的容量、 SN为 7的 PDU的数据信息和不包含 SN 的首部信息的容量。 步骤 3 , RLC将上述多个 PDU按照其 SN进行分组,其中,每组的 PDU 的 SN连续, 各组之间的 PDU的 SN为非连接; 步骤 4 , RLC将每组 PDU分别携带在当前子帧的一个 RLC报文中 , 执 行步骤 S306; 步骤 5 , RLC 夺上述多个 PDU携带在至少两个子帧的一个或多个 RLC
4艮文中。 具体地, 上述步骤 5的处理可以包括以下处理: 步骤 5.1 , 顺序获取上述多个 PDU中传输容量为 C的数据部分携带在 当前子帧的一个或多个 RLC报文中,其中,如果该数据部分包括的多个 PDU 中有 SN连续的 PDU , 则将 SN连接的 PDU携带在一个 RLC 4艮文中, 因此, 同样, 在当前子帧的一个或多个 RLC报文中携带的 PDU的 SN连续, 各个 RLC报文间携带的 PDU的 SN为非连续,即如果该数据部分包括的多个 PDU 的 SN都连续 , 则将该数据部分的 PDU都携带在一个 RLC报文中; 步骤 5.2 , 在上述当前子帧的下一个子帧, 获取当前的逻辑信道的传输 容量 E,判断上述多个 PDU中剩余的数据部分的传输容量是否小于或等于 E, 如果是, 则执行步骤 5.3 , 否则, 执行步骤 5.4; 步骤 5.3 ,将上述多个 PDU中剩余的数据部分携带在上述当前子帧的下 一个子帧的一个或多个 RLC报文中,具体的携带方式与上述步骤 5.1中相同, 在此不在赞述, 执行步骤 S306; 步骤 5.4, 顺序获取上述多个 PDU中剩余的数据部分传输容量为 E的 数据部分, 将该数据部分携带在上述当前子帧的下一个子帧的一个或多个 RLC报文中, 具体的携带方式与上述步骤 5.1中相同, 在此不在赞述; 步骤 5.5 ,将上述当前子帧的下一子帧作为当前子帧,返回执行步骤 5.2。 在具体应用中 , 在上述步骤 5.3和步骤 5.4中, 对于每个 RLC 4艮文, 如 果待携带在该 RLC报文中的第一个 PDU包含其数据信息和首部信息, 即携 带的第一个 PDU完整, 则将该 PDU的首部信息和数据信息均携带在该 RLC 报文中, 将与该 PDU的 SN连续的其它 PDU的数据信息和不包括 SN的首 部信息携带在该 RLC报文中; 如果待携带在该 RLC报文中的第一个 PDU不完整,即只携带了该 PDU 的部分数据 , 则将该 PDU所包含的部分数据携带在该 RLC报文中 , 将与该 PDU的 SN连接的下一个 PDU的首部信息和数据信息携带在该 RLC报文中, 将该 RLC 4艮文中其它 PDU的数据信息和不包括 SN的首部信息携带在所述 RLC中。 在具体实施过程中, 在该种情况下, RLC报文中携带的 SN也可以 是第一个 PDU的 SN。 在具体实施过程, 对于每个 RLC 4艮文, 可以在该 RLC 4艮文的头部携带 该 RLC报文中携带的各个 PDU的长度信息, 接收方根据该长度信息, 可以 解析出该 RLC报文中携带的各个 PDU。 图 4a示出了一种 RLC 4艮文的结构, 如图 4a所示, RLC 4艮文中除了头 部夕卜, ^)夺 N个 PDCP PDU携带在 N个 RLC的 SDU中, 并且 , 每个 RLC 艮 文中仅携带了第一个 PDCP PDU的 SN。 图 4b示出了另一种 RLC报文的结构, 如图 4b所示, RLC 4艮文中除了 头部外, 在这种结构中, RLC 4艮文中仅携带了第二个 PDCP PDU的 SN。 并且,在上述一个或多个 RLC 4艮文中的各个 RLC 4艮文的头部还可以设 置第一传输标识和第二传输标识, 其中, 第一传输标识用于指示该 RLC ·ί艮文 中携带的第一个 PDU是否完整, 第二传输标识用于指示该 RLC报文中携带 的最后一个 PDU是否完整。 具体地,可以在 RLC 4艮文的头部用 2bit的字段 FI来标识第一传输标识 和第二传输标识, 第一个比特标识第一传输标识, 当第一个比特为 1时指示 RLC报文中携带的第一个 PDU的内容信息是完整的, 第一个比特为 0时指 示 RLC报文中携带的第一个 PDU的内容信息是不完整; 第二个比特标识第 二传输标识, 当第二个比特为 1时指示 RLC 4艮文中携带的最后一个 PDU的 内容信息是完整的,第二个比特为 0时指示 RLC ~t艮文中携带的最后一个 PDU 的内容信息是不完整。 对于不需要在 RLC 4艮文中携带 SN的 PDCP PDU,则删除该 PDCP PDU 的 SN。具体地,由于 PDCP PDU分为三种类型,即 SRB、 AM DRB、 UM DRB , 因此, 针对这三种 PDCP PDU, 将 PDCP PDU的数据信息和不包括 SN的首 部信息携带在 RLC报文中的方法可以具体区分为以下三种: 第一, 如图 2a 所示, 在 PDCP PDU为 SRB的情况下, SN单独占有一个字节, 可以直接删 除该字节后将 PDCP PDU的内容信息携带在 RLC报文中; 第二, 在 PDCP PDU为 AM DRB的情况下, SN和数据 /控制( D/C )标识共同占有一个字节 , 可以将该字节保留, 但该保留后的 SN在接收方对 PDCP PDU进行恢复时, 并不起到实质作用; 第三, 在 PDCP PDU为 UM DRB的情况下 , SN的长度 为 12bit, 和 D/C标识共同占有 2个字节, 可以夺包括 DC标识的高位字节保 留 , 包括 SN的低位字节删除 , 将删除该低位字节后的 PDCP PDU的内容信 息携带在 RLC 4艮文中。 通过本实施例提供的技术方案 , 能够在传输连续的多个 PDCP PDU时 , 仅在 RLC报文中携带该报文中携带的第一个 PDCP PDU的 SN,从而能够避 免传输 PDU的过程中传输冗余的 SN, 从而能够减小对空口的负荷。 下面以用户设备( UE ) 为发送端为例, 对本发明方法实施例一提供的 PDU 的发送方法的具体实施的过程进行描述, 具体地, PDU 的发送可以包 括以下步骤 1至步骤 7: 步骤 1 , UE的 PDCP层收到来自非接入层的连续的多个 PDCP PDU, PDCP层为每个 PDCP SDU生成一个 PDCP SN, 该 PDCP SN用于对每个 PDCP PDU进行力。密和完整性保护, 具体地, 通过 SN对 载信令的 PDU进 行加密和完整性保护、 对 7|c载数据的 PDU进行加密保护; 步骤 2 , RLC层接收到 PDCP层下发的携带 SN的多个连续的 PDCP
PDU; 步骤 2对应于上述步骤 S302; 步骤 3 , RLC从 MAC层获取当前逻辑信道的传输容量 C; 步骤 4, 判断上述多个 PDCP PDU的传输容量 L是否小于或等于上述 传输容量 C, 如果是, 则执行步骤 5 , 否则, 执行步骤 7; 步骤 5 , RLC将上述多个 PDU按照其 SN进行分组,其中,每组的 PDU 的 SN连续 , 各组之间的 PDU的 SN为非连接; 步骤 6: RLC将上述每组 PDCP PDU携带在当前子帧的一个 RLC 4艮文 中, 执行步骤 13; 步骤 7, RLC顺序获取上述多个 PDU中传输容量为 C的数据部分携带 在当前子帧的一个或多个 RLC 4艮文中; 其中, 如果该数据部分包括的多个 PDU中有 SN连续的 PDU, 则将 SN 连接的 PDU携带在一个 RLC 4艮文中, 因 jib, 同样, 在当前子帧的一个或多 个 RLC 4艮文中携带的 PDU的 SN连续,各个 RLC 4艮文间携带的 PDU的 SN 为非连续 , 即如果该数据部分包括的多个 PDU的 SN都连续 , 则将该数据部 分的 PDU都携带在一个 RLC 4艮文中; 步骤 9, RLC在上述当前子帧的下一个子帧, 获取当前的逻辑信道的传 输容量 Ε,判断上述多个 PDU中剩余的数据部分的传输容量是否小于或等于 Ε, 如果是, 则执行步骤 10, 否则, 执行步骤 11 ; 步骤 10, 将上述多个 PDU中剩余的数据部分携带在上述当前子帧的下 一个子帧的一个或多个 RLC 4艮文中 , 执行步骤 13; 步骤 11 , 顺序获取上述多个 PDU中剩余的数据部分传输容量为 Ε的数 据部分, 将该数据部分携带在上述当前子帧的下一个子帧的一个或多个 RLC 4艮文中; 步骤 12, 将上述当前子帧的下一子帧作为当前子帧, 返回步骤 9; 上述步骤 5 -步骤 12对应于上述步骤 S304。 步骤 13 , 将 RLC 4艮文发送给接收方 (例如, 基站或中继站)。 步骤 13 对应于上述步骤 S306。 上述步骤 1至步骤 13的处理过程可以应用于 UE和基站间已建立正常 连接的场景, 还可以应用于 UE进行基站切换时的场景, 该处理过程能够在 传输多个连续 PDCP PDU时, 只在 RLC 4艮文中携带其中第一个 PDCP PDU 的 SN, 从而能够减小空口负荷。 装置实施例一 居本发明实施例, 提供了一种 PDU的发送装置, 优选地, 可以在该 装置上使用上述方法实施例一提供的 PDU的发送方法。 图 5示出了才艮据本发明装置实施例的 PDU的发送装置的结构, 如图 5 所示, 根据本发明装置实施例的 PDU的发送装置包括: 接收模块 1、 配置模 块 3、 发送模块 5。 下面进一步描述上述各模块的功能。 接收模块 1 , 用于接收来自 PDCP的连续的多个 PDU, 其中, 多个 PDU 中的各个 PDU中均携带有:数据信息和包括序列号 SN的首部信息;优选地, 接收模块 1可以执行上述步骤 S302; 配置模块 3 , 连接至接收模块 1 , 用于将接收模块 1接收到的上述各个 PDU携带在一个或多个 RLC 4艮文中, 其中, 每个 RLC 4艮文中携带的 PDU 的 SN连续 , 且每个 RLC报文中只携带了一处 PDU的 SN; 优选地 , 配置模 块 3可以执行上述步骤 S304; 发送模块 5, 连接至配置模块 3 , 用于将一个或多个 RLC报文发送给接 收方。 优选地, 发送模块 5可以执行上述步骤 S306。 通过本实施例提供的 PDU的发送装置, 能够将仅携带一个 PDCP PDU 的 SN的 RLC 4艮文发送给接收方。 方法实施例二 才艮据本发明实施例 , 还提供了一种 PDU的接收方法 , 该 PDU的接收方 法可以与上述 PDU的发送方法配合使用。 图 6示出了才艮据本发明方法实施例二的 PDU的接收方法的流程, 如图 6所示, 才艮据本发明方法实施例二的 PDU的接收方法主要包括以下步骤 (步 骤 S602 -步骤 S608 ): 步骤 S602 , 接收方的 RLC接收到来自发送方的多个连续的 RLC 4艮文 , 其中,每个 RLC 4艮文中携带有一个 PDU的 SN、和至少一个 PDU,每个 PDU 包括: 数据信息和不包括 SN的首部信息; 步骤 S604 , RLC解析接收到的多个 RLC报文, 获取各个 RLC报文中 携带的 SN以及各个 PDU的数据信息和不包括 SN的首部信息; 步骤 S606 , RLC才艮据各个 RLC 4艮文中携带的 SN , 获取各个 RLC 4艮文 中携带的各个 PDU的 SN; 步骤 S608 , 将各个 PUD的 SN组合到该 PDU的数据信息和不包括 SN 的首部信息中得到一个 PDCP PDU。 执行完上述步骤后, 接收方的 RLC还可以将每个 PDCP PDU发送给 PDCP层。 下面详细描述上述处理的细节。 在上述步骤 S602中,接收到的 RLC报文的头部还可以携带有各个 PDU 的长度信息、 第一传输标识、 第二传输标识, 其中, 第一传输标识用于指示 该 RLC报文中携带的第一个 PDU是否完整,即是否携带了该 PDU的全部数 据信息和不包括 SN的首部信息, 第二传输标识用于指示该 RLC 4艮文中携带 的最后一个 PDU是否完整。 在上述步骤 S604中, 优选地, 可以才艮据该 RLC 4艮文中各个 PDU的长 度信息, 从该 RLC报文中获取至少一个 PDU的数据信息和不包括 SN的首 部信息。 在上述步骤 S606中, 对于每个 RLC报文, 对位于解析获取的 SN对应 的 PDU之前的各个 PDU的 SN按照解析获取的所述 SN依次递减, 对位于 解析获取的 SN对应的 PDU之后的 SN按照解析获取的所述 SN依次递增。。 在上述步骤 S608中 , 对于每个 RLC报文, 将获取到的 PDU的数据信 息和首部信息与其对应的 SN进行组合, 即, 将 SN写入到 PDU的首部信息 中成为一个完整的 PDU。 此外, 在上述步骤 S608中, 如果当前 RLC报文的第一传输标识指示当 前 RLC 4艮文中的第一个 PDU不完整 (例如, FI字段的第一个比特为 0 ), 则 才艮据当前 RLC 4艮文的 SN找到当前 RLC 4艮文的上一个 RLC 4艮文, 如果该上 一个 RLC 4艮文的第二传输标识指示其中携带的最后一个 PDU不完整(例如, FI字段的第二个比特为 0 ),或者,该上一个 RLC 4艮文中携带的最后一个 PDU 对应的 SN与当前 RLC 4艮文携带的第一个 PDU的 SN相同, 贝 ^ , 将当前 4艮 文的第一个 PDU对应的 SN、 当前 4艮文携带的第一个 PDU的数据信息和首 部信息 (即, PDU 分割后的第一部分数据 )、 当前 4艮文的上一 4艮文携带的最 后一个 PDU的数据信息和首部信息 (即, PDU分割后的第二部分数据 ) 进 行组合, 即, 将第一部分数据和第二部分数据进行组合得到 PDU 的数据信 息和首部信息,并将 SN写入到组合后的 PDU的数据信息和首部信息中得到 完整的 PDCP PDU。 通过本实施例提供的技术方案 , 能够从来自发送方的多个 RLC报文中 解析获取其中的一个 PDCP PDU的 SN和至少一个 PDCP PDU的数据, 并才艮 据该 SN获取其余 PDCP PDU对应的 SN,将 PDCP PDU数据及其对应的 SN 进行组合后获得完整的 PDCP PDU。 下面以用户设备( UE ) 为接收端为例, 具体描述根据本发明方法实施 例二的 PDU的接收方法的具体实施的过程: 步骤 1 , UE的 RLC层收到 MAC层的 RLC报文; 步骤 1对应于上述步 骤 S602; 步骤 2 , RLC解析 RLC 4艮文 , 从 RLC 4艮文中获取第一个 PDU对应的 SN, 从报文头部获得各个 PDU内容信息的长度信息、 从 FI字都获取第一传 输标识和第二传输标识; 步骤 2对应于上述步骤 S604; 步骤 3 , RLC才艮据各 PDU的长度信息 ,从 RLC 4艮文中分别读取各 PDU 的数据信息和不包括 SN的首部信息; 步骤 3对应于上述步骤 S606; 步骤 4, RLC判断 FI字段的第一个比特是否为 1 , 如果为 1 , 则处理进 行到步骤 5 , 如果为 0 , 则处理进行到步骤 6; 步骤 5 , 从 RLC报文中获取其携带的第一个 PDU的数据信息和首部信 息 (包括 SN ); 步骤 6, RLC依次对除第一个 PDU和除最后一个 PDU PDU的内容信 息及其 SN进行组合, 得到完整的 PDU; 步骤 7, RLC判断 FI字段的第二个比特是否为 1 , 如果为 1 , 则处理进 行到步骤 8 , 如果为 0 , 则处理进行到步骤 9; 步骤 8 , RLC将最后一个 PDU的数据信息和不包括 SN的首部信息及 其对应的 SN进行组合, 得到完整的最后一个 PDU, 执行步骤 13; 步骤 9 , RLC才艮据当前 RLC 4艮文的 SN找到下一个 RLC 4艮文; 步骤 10, 判断从下一个 RLC报文的 FI字段的第一个比特是否为 0 , 如 果为 0 , 则处理进行到步骤 11 , 否则, 处理返回步骤 9; 步骤 11 , RLC从下一个 RLC报文中获取第一个 PDU的数据信息和首 部信息; 步骤 12, RLC将当前 RLC 4艮文的最后一个 PDU对应的 SN、 最后一个 PDU的数据、 下一个 RLC报文中的第一个 PDU的数据进行组合, 得到完整 的最后一个 PDU; 步骤 4至步骤 12对应于上述步骤 S608; 步骤 13 ,将组合后的 PDU发送给 PDCP层。 PDCP层才艮据接收到的 PDCP 的 SN对 PDCP PDU进行解密和完整性验证。 通过上述步骤 1至步骤 13的处理,从来自发送方的多个 RLC 4艮文中解 析获取其中的一个 PDCP PDU的 SN和至少一个 PDCP PDU的数据, 并才艮据 该 SN获取其余 PDCP PDU对应的 SN,将 PDCP PDU的数据及其对应的 SN 进行组合后获得完整的 PDCP PDU。 装置实施例二 根据本发明实施例 , 提供了一种 PDU的接收装置, 该 PDU的接收装置 可以与上述 PDU 的发送装置配合使用, 并且, 该接收装置可以用于实施本 发明方法实施例二提供的 PDU的接收方法。 图 7示出了根据本发明装置实施例二的 PDU的接收装置的结构, 如图 7所示, 根据本发明装置实施例二的 PDU的接收装置包括: 接收模块 2、 解 析模块 4、 获取模块 6和组合模块 8。 其中, 接收模块 2 , 用于接收到来自发送方的多个连续的 RLC报文, 其中, 每个 RLC 4艮文中携带有一个 PDU的 SN、 和至少一个 PDU的数据信息和不 包括 SN的首部信息; 优选地, 接收模块 2可用于执行上述步骤 S602; 解析模块 4 , 连接到接收模块 2 , 用于解析接收模块 2接收到的多个连 续的 RLC报文, 获取各个 RLC报文中携带的 SN以及各个 PDU的数据信息 和不包括 SN的首部信息; 优选地, 解析模块 4可用于执行上述步骤 S604; 获取模块 6, 连接到解析模块 4, 用于才艮据解析模块 4进行解析的结果, 根据各个 RLC报文中携带的 SN , 获取各个 RLC报文中携带的各个 PDU的 SN; 优选地, 获取模块 6可以用于执行上述步骤 S606; 组合模块 8, 连接到解析模块 4和获取模块 6, 用于将获取模块 6获取 的各个 PDU的 SN与解析模块 4获取的各个 PDU的数据信息和不包括 SN 的首部信息进行组合得到一个 PDCP PDU。 优选地, 组合模块 8可用于执行 上述步骤 S608。 通过本实施例提供的 PDU的接收装置 , 能够从来自发送方的多个 RLC 艮文中解析获取其中的一个 PDCP PDU的 SN和至少一个 PDCP PDU的数 据 , 并才艮据该 SN获取其余 PDCP PDU对应的 SN, 将 PDCP PDU数据及其 对应的 SN进行组合后获得完整的 PDCP PDU。 需要说明的是,本发明实施例虽然以 LTE为例描述了 PDU的发送 /接收 方法, 应该理解的是, 本领域的技术人员也可以将本实施例提供的 PDU 的 发送 /接收方法应用于其他无线接入系统, 例如 WCDMA , CDMA2000 和 TD-SCDMA。 综上所述, 借助于本发明的技术方案, 通过在将多个连续的 PDCP PDU 携带在 RLC 4艮文中的过程中, 只在 RLC 4艮文携带多个连续的 PDCP PDU中 一个 PDCP PDU的 SN, 能够解决相关技术中存在的传输每个 PDCP PDU时 携带该 PDCP PDU的 SN,从而对空口造成负荷的问题, 能够减小传输 PDCP PDU 的过程中给空口造成的负荷, 从而减少占用的系统资源、 提高 PDCP PDU的传输效率。 显然, 本领域的技术人员应该明白, 上述的本发明的各模块或各步骤可 以用通用的计算装置来实现, 它们可以集中在单个的计算装置上, 或者分布 在多个计算装置所组成的网络上, 可选地, 它们可以用计算装置可执行的程 序代码来实现, 从而, 可以将它们存储在存储装置中由计算装置来执行, 或 者将它们分别制作成各个集成电路模块, 或者将它们中的多个模块或步骤制 作成单个集成电路模块来实现。 这样, 本发明不限制于任何特定的硬件和软 件结合。 以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本 领域的技术人员来说, 本发明可以有各种更改和变化。 凡在本发明的 4青申和 原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的保护 范围之内。

Claims

权 利 要 求 书
1. 一种协议数据单元的发送方法, 其特征在于, 包括:
发送方的无线链路控制层 RLC 接收到来自协议数据汇聚协议层 PDCP的多个协议数据单元 PDU, 其中, 所述多个 PDU中的各个 PDU 中均包括: 数据信息和包括序列号 SN的首部信息;
所述 RLC将所述多个 PDU携带在一个或多个 RLC 4艮文中, 其中, 每个 RLC 4艮文中携带的 PDU的 SN连续, 且每个 RLC 4艮文中只携带了 一个 PDU的 SN;
所述 RLC将所述一个或多个 RLC 4艮文发送给接收方。
2. 根据权利要求 1所述的方法, 其特征在于, 所述方法还包括:
在所述一个或多个 RLC 4艮文中的每个 RLC 4艮文的头部携带该 RLC 报文中携带的各个 PDU的长度信息。
3. 才艮据权利要求 1所述的方法, 其特征在于, 所述 RLC将所述多个 PDU 携带在所述一个或多个 RLC 4艮文中包括:
所述 RLC从媒体接入层 MAC获取当前逻辑信道的传输容量 C; 如果所述多个 PDU的传输容量 L小于或等于所述传输容量 C, 则 将所述多个 PDU携带在一个子帧的一个或多个 RLC报文中, 其中, 各 个 RLC 4艮文中携带的 PDU的 SN连续, 各个 RLC 4艮文间携带的 PDU 的 SN为非连续;
如果传输容量 L大于所述传输容量 C, 则将所述多个 PDU携带在 至少两个子帧的一个或多个 RLC 4艮文中;
其中, C、 L为自然数。
4. 根据权利要求 3所述的方法, 其特征在于, 将所述多个 PDU携带在至少 两个子帧的一个或多个 RLC 4艮文中包括:
顺序获取所述多个 PDU中传输容量为 C的数据部分并携带在当前 子帧的一个或多个 RLC报文中, 其中, 各个 RLC报文中携带的 PDU的 SN连续, 各个 RLC 4艮文间携带的 PDU的 SN为非连续; 才艮据发送 PDU时的逻辑信道的传输容量,顺序将所述多个 PDU中 其余的数据部分携带在所述当前子帧的下一个或多个子帧的一个或多个 RLC报文中。 根据权利要求 4所述的方法, 其特征在于, 对于每个 RLC报文:
如果待携带在所述 RLC报文中的第一个 PDU包含其数据信息和首 部信息,则将该 PDU的首部信息和数据信息均携带在所述 RLC报文中, 将与该 PDU的 SN连续的其它 PDU的数据信息和不包括 SN的首部信息 携带在所述 RLC 4艮文中; 或者
如果待携带在所述 RLC报文中的第一个 PDU只包含其数据信息和 首部信息中的部分数据, 则将该 PDU的 SN和其所包括的部分数据携带 在所述 RLC报文中, 将与该 PDU的 SN连接的其它 PDU的数据信息和 不包括 SN的首部信息携带在所述 RLC 4艮文中; 或者
如果携带在所述 RLC报文中的第一个 PDU只包含其数据信息和首 部信息中的部分数据 , 则将该 PDU所包含的部分数据携带在所述 RLC 报文中, 将与该 PDU的 SN连接的下一个 PDU的首部信息和数据信息 携带在所述 RLC中,将所述 RLC报文中其它 PDU的数据信息和不包括 SN的首部信息携带在所述 RLC中。 根据权利要求 4或 5所述的方法, 其特征在于, 所述方法还包括:
在所述一个或多个 RLC报文中的各个 RLC报文的头部设置第一传 输标识和第二传输标识, 其中, 所述第一传输标识用于指示该 RLC报文 中携带的第一个 PDU是否完整, 所述第二传输标识用于指示所述 RLC 报文中携带的最后一个 PDU是否完整。 才艮据权利要求 1所述的方法, 其特征在于, 在所述 RLC将所述一个或多 个 RLC 4艮文发送给接收方之后 , 所述方法还包括:
将所述一个或多个 RLC 4艮文携带在 MAC 4艮文中 ,将所述 MAC 4艮 文发送给所述接收方。 根据权利要求 1所述的方法, 其特征在于, 在所述 RLC发送所述一个或 多个 RLC 4艮文之后 , 所述方法还包括:
所述接收方的 RLC从所述一个或多个 RLC 4艮文中解析出各个 RLC 报文中携带的 SN和各个 PDU的数据信息和不包括 SN的首部信息 , 并 根据所述 RLC报文中携带的所述 SN ,获取所述 RLC报文中携带的各个 PDU的 SN;
对位于该 SN之前的 PDU,其 SN才艮据位置依次递减, 对位于该 SN 之后的 PDU , 其 SN才艮据位置依次递增。
9. 一种协议数据单元的接收方法, 其特征在于, 包括:
接收方的无线链路控制层 RLC 接收到来自发送方的多个连续的 RLC 4艮文 , 其中, 各个 RLC 4艮文中携带有一个协议数据单元 PDU的序 列号 SN、 和至少一个 PDU, 其中, 每个 PDU包括: 数据信息和不包括 SN的首部信息;
所述 RLC解析接收到的所述多个 RLC报文, 获取各个 RLC报文 中携带的 SN以及各个 PDU的数据信息和不包括 SN的首部信息;
所述 RLC根据各个 RLC报文中携带的 SN , 获取各个 RLC报文中 携带的各个 PDU的 SN;
将各个 PDU的 SN组合到该 PDU的数据信息和不包括 SN的首部 信息中得到一个协议数据汇聚协议层 PDCP PDU。
10. 才艮据权利要求 9所述的方法, 其特征在于, 所述方法还包括:
将得到的各个 PDCP PDU发送给 PDCP层。
11. 根据权利要求 9所述的方法, 其特征在于, 对于每个报文, 所述 RLC报 文的头部携带有各个 PDU的长度信息、 第一传输标识、 第二传输标识 , 其中, 所述第一传输标识用于指示所述 RLC 4艮文中携带的第一个 PDU 是否完整,所述第二传输标识用于指示所述 RLC 4艮文中携带的最后一个 PDU是否完整。
12. 根据权利要求 11所述的方法, 其特征在于, 对于每个 RLC报文, 获取 所述 RLC报文中携带的 PDU的数据信息和不包括 SN的首部信息包括: 根据所述 RLC报文中各个 PDU的长度信息, 从所述 RLC报文中 获取至少一个 PDU的数据信息和不包括 SN的首部信息。
13. 根据权利要求 9所述的方法, 其特征在于, 对于每个 RLC报文, 获取各 个 PDU的 SN包括: 对位于解析获取的 SN对应的 PDU之前的各个 PDU的 SN按照解 析获取的所述 SN依次递减 , 对位于解析获取的 SN对应的 PDU之后的 SN按照解析获取的所述 SN依次递增。
14. 根据权利要求 11所述的方法, 其特征在于, 对于每个 RLC报文, 将每 个 PDU的 SN组合到该 PDU的数据信息和不包括 SN的首部信息中得到 一个 PDCP PDU还包括:
如果所述第二传输标识指示所述 RLC 4艮文中的最后一个 PDU是不 完整的,且所述 RLC 4艮文的下一 4艮文的第一传输标识指示该 4艮文中的第 一个 PDU是不完整的 , 则从所述 RLC报文的下一报文中获取其中的第 一个 PDU, 将所述 RLC 4艮文中最后一个 PDU对应的 SN、 所述 RLC 艮 文中最后一个 PDU、 以及所述 RLC 4艮文的下一 4艮文中的第一个 PDU组 合为一个 PDCP PDU。
15. 一种协议数据单元的发送装置, 其特征在于, 包括:
接收模块,用于接收来自协议数据汇聚协议层 PDCP的连续的多个 协议数据单元 PDU, 其中 , 所述多个 PDU中的各个 PDU中均携带有: 数据信息和包括序列号 SN的首部信息;
配置模块, 用于将所述多个 PDU携带在一个或多个 RLC报文中 , 其中, 每个 RLC 4艮文中携带的 PDU的 SN连续, 且每个 RLC 4艮文中只 携带了一个 PDU的 SN;
发送模块, 用于将所述一个或多个 RLC报文发送给接收方。
16. 一种协议数据单元的接收装置, 其特征在于, 包括:
接收模块 , 用于接收到来自发送方的多个连续的无线链路控制层 RLC 4艮文 , 其中, 各个 RLC 4艮文中携带有一个协议数据单元 PDU的序 列号 SN、 和至少一个 PDU, 其中, 每个 PDU包括: 数据信息和不包括 SN的首部信息;
解析模块, 用于解析所述接收模块接收到的多个连续的 RLC报文, 获取各个 RLC报文中携带的 SN以及各个 PDU的数据信息和不包括 SN 的首部信息; 获取模块, 用于根据所述解析模块的解析结果, 根据各个 RLC报 文中携带的所述 SN , 获取各个 RLC报文中携带的各个 PDU的 SN; 组合模块, 用于将所述获取模块获取到的每个 PDU的 SN组合到 该 PDU的数据信息和不包括 SN的首部信息中得到一个协议数据汇聚协 议层 PDCP PDU。
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