WO2010016150A1 - Dispositif sans fil, procédé de communication et programme de communication - Google Patents

Dispositif sans fil, procédé de communication et programme de communication Download PDF

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Publication number
WO2010016150A1
WO2010016150A1 PCT/JP2008/064363 JP2008064363W WO2010016150A1 WO 2010016150 A1 WO2010016150 A1 WO 2010016150A1 JP 2008064363 W JP2008064363 W JP 2008064363W WO 2010016150 A1 WO2010016150 A1 WO 2010016150A1
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WIPO (PCT)
Prior art keywords
data
pdcp
storage device
rlc
sublayer
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PCT/JP2008/064363
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English (en)
Japanese (ja)
Inventor
慎也 岡本
一央 大渕
昭英 音成
良則 副島
学 久保田
美樹 山崎
千昌 篠原
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富士通株式会社
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Priority to PCT/JP2008/064363 priority Critical patent/WO2010016150A1/fr
Publication of WO2010016150A1 publication Critical patent/WO2010016150A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements 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
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1874—Buffer management

Definitions

  • the present invention relates to a wireless device capable of transmitting data, a communication method thereof, and a communication program.
  • Mobile communication systems such as mobile phones are currently starting the third generation system using the W-CDMA (Wideband Code Division Multiple Access) system.
  • W-CDMA Wideband Code Division Multiple Access
  • LTE Long Term Evolution
  • 3GPP 3rd Generation Partnership Project
  • FIG. 13 is a diagram for explaining layer 2 constituting the protocol layer of the conventional mobile communication system.
  • the layer 2 includes a MAC (Medium Access Control) sublayer, an RLC (Radio Link Control) sublayer, and a PDCP (Packet Data Convergence Protocol) sublayer.
  • Layer 2 has a plurality of logical channels (LCH), and the PDCP sublayer and the RLC sublayer have an entity for each logical channel.
  • LCH logical channels
  • the PDCP sublayer is a layer that transmits / receives user data (IP packets) to / from the upper layer network layer or transmits / receives control data to / from RRC (Radio Resource Control) that is layer 3 .
  • the PDCP sublayer transmits and receives data to and from the RLC sublayer which is a lower sublayer using a PDCP-PDU (Protocol Data Unit).
  • the PDCP sublayer performs IP header compression / decompression processing, concealment processing, and SDU (Service Data Unit) discard processing for user data, and concealment processing and integrity protection for controller data.
  • IP header compression / decompression processing processing for user data
  • SDU Service Data Unit
  • the RLC sublayer is a layer that performs data retransmission control by ARQ (Automatic repeat-request). Further, the RLC sublayer has three transfer modes, AM (Acknowledged Mode), UM (Unacknowledged Mode), and TM (Transparent Mode), and performs data transmission / reception with the MAC sublayer, which is a lower layer, using RLC-PDU.
  • AM Acknowledged Mode
  • UM Unacknowledged Mode
  • TM Transparent Mode
  • the transmission-side RLC sublayer notifies the PCDP sublayer of information on RLC-PDUs that have been acknowledged by ARQ processing (see Non-Patent Document 2).
  • the MAC sublayer schedules data with each RLC sublayer mapped to a plurality of logical channels, multiplexes data from the RLC, and transmits the multiplexed data as a MAC-PDU to layer 1 which is a lower layer. It is a layer (see Non-Patent Document 3). Note that when the MAC sublayer acquires data from layer 1, the MAC sublayer performs a process opposite to that at the time of transmission.
  • FIG. 14 is a diagram for explaining the flow of data transmitted and received between the sub-layers of layer 2.
  • the flow of data when the transfer mode of the RLC sublayer is AM is shown.
  • the PDCP sublayer converts an IP packet received from an upper layer (network layer) into PDCP-SDU, and creates a PDCP-PDU in which control data (for example, a sequence number) is added to the PDCP-SDU. Then, the created PDCP-PDU (Packet Data Unit) is output to the RLC sublayer.
  • control data for example, a sequence number
  • the RLC sublayer converts the PDCP-PDU obtained from the PDCP sublayer into an RLC-SDU, combines a plurality of RLC-SDUs, creates an RLC-PDU to which control data is added, and creates the created RLC-PDU as a MAC sublayer. Output to.
  • the MAC sublayer converts RLC-PDUs acquired from each logical channel into MAC-SDUs, combines a plurality of MAC-SDUs, creates a MAC-PDU with control data added, and creates the MAC-PDU as a lower layer. Output to layer.
  • FIG. 15 is a diagram illustrating a configuration of a conventional PDCP sublayer, RLC sublayer, and MAC sublayer.
  • the PDCP sublayer 10 includes a PDCP-SDU management buffer 11, an IP header compression unit 12, a concealment processing unit 13, a PDCP-PDU header adding unit 14, and a PDCP control unit 15.
  • the PDCP control unit 15 converts the received IP packet into a PDCP-SDU, and the converted PDCP-SDU is managed by the PDCP-SDU management. Store in buffer 11.
  • the IP header compression unit 12 acquires the PDCP-SDU from the PDCP-SDU management buffer 11 and compresses the IP header included in the acquired PDCP-SDU.
  • the concealment processing unit 13 acquires the PDCP-SDU compressed with the IP header from the IP header compression unit 12 and executes various concealment processes.
  • the PDCP-PDU header adding unit 14 acquires the PDCP-SDU from the concealment processing unit 13, and generates a PDCP-PDU by adding a control header to the acquired PDCP-SDU.
  • the control header given to the PDCP-SDU includes a sequence number for identifying the order of each PDCP-SDU.
  • the PDCP-PDU header adding unit 14 outputs the PDCP-PDU added with the control header to the RLC sublayer 20.
  • the PDCP control unit 15 controls the entire PDCP sublayer 10.
  • the PDCP control unit 15 has a Discard_Timer management unit 15a.
  • the DiscCP_Timer is activated for each user data, and when the user times out, the target user When data exists in the PDCP sublayer, or when ARQ processing is not started in the RLC sublayer, target user data is discarded (for example, see Non-Patent Document 4).
  • the RLC sublayer 20 includes a transmission buffer 21, an ARQ processing unit 22, and an RLC control unit 23.
  • the Transmission buffer 21 stores the restored RLC-SDU after restoring the PDCP-PDU acquired from the PDCP sublayer 10 to the RLC-SDU based on the content of the control header of the PDCP-PDU.
  • the ARQ processing unit 22 creates an RLC-PDU and outputs the RLC-PDU to the MAC sublayer 30, thereby transferring the RLC-PDU to the RLC sublayer of the opposite station.
  • the ARQ processing unit 22 performs ARQ processing and outputs delivery confirmation information to the PDCP sublayer 10 when transmission confirmation is obtained with the RLC sublayer of the opposite station.
  • the Re-Establishment process is executed in the RLC sublayer 20. .
  • the RLC control unit 23 controls the entire RLC sublayer 20. For example, when the RLC control unit 23 obtains a data request from the MAC sublayer 30, the RLC control unit 23 notifies the ARQ processing unit 22 of the requested data amount, so that the RLC-PDU corresponding to the data in accordance with the request from the MAC sublayer 30 is obtained. Are output from the ARQ processing unit 22 to the MAC sublayer 30.
  • the RLC control unit 23 acquires a discard request from the PDCP sublayer 10
  • the RLC control unit 23 outputs a data discard request to the transmission buffer 21 and the ARQ processing unit 22.
  • the RLC control unit 23 issues a request for discarding all of the RLC-SDU stored in the Transmission buffer 21 and the RLC-PDU being ARQ processed. Are output to the ARQ processing unit 22, and the RLC-SDU and the RLC-PDU are discarded.
  • the MAC sublayer 30 includes a multiplexing unit 31 and a scheduler 32.
  • the multiplexing unit 31 acquires RLC-PDUs from the RLC sublayer of each logical channel, creates a MAC-PDU in which each acquired RLC-PDU is multiplexed, and outputs the created MAC-PDU to layer 1 .
  • the scheduler 32 manages the amount of RLC-PDU data received from each logical channel and notifies the required amount of data to the RLC sublayer of each logical channel.
  • FIG. 16 is a diagram for explaining the flow of conventional SDU discard processing.
  • the PDCP control unit 15 specifies the timed-out PDCP-SDU, and sends the specified PDCP-SDU discard request to the PDCP-SDU management buffer 11.
  • the specified PDCP-SDU is output and discarded.
  • the PDCP control unit 15 notifies the RLC sublayer 20 of the PDCP-SDU and RLC-SDU to be discarded.
  • the RLC control unit 23 determines whether or not the ARQ process is performed on the RLC-SDU to be discarded, and the ARQ process is not performed. In this case, the RLC-SDU to be discarded is notified to the transmission buffer 21.
  • FIG. 17 is a diagram for explaining the flow of a conventional delivery confirmation process.
  • the ARQ processing unit 22 of the RLC sublayer 20 in the ARQ process performed by the ARQ processing unit 22 of the RLC sublayer 20, there is an RLC-PDU that has been acknowledged with the RLC of the opposite station, and the transmission confirmation is performed even when assembled in the RLC-SDU.
  • the ARQ processing unit 22 notifies the RLC control unit 23 of ACK.
  • the RLC control unit 23 When the RLC control unit 23 acquires the ACK notification from the ARQ processing unit 22, the RLC control unit 23 notifies the PDCP sublayer 10 of the ACK for the PDCP-PDU or RLC-SDU for which the delivery confirmation has been taken.
  • the PDCP control unit 15 When the PDCP control unit 15 acquires the ACK notification from the RLC sublayer 20, the PDCP control unit 15 specifies the PDCP-SDU corresponding to the ACK notification, and notifies the PDCP-SDU buffer management 11 of the specified PDCP-SDU discard notification. , Stop Discard_Timer corresponding to PDCP-SDU.
  • FIG. 18 is a diagram for explaining the flow of the conventional Re-Establishment process.
  • the RLC sublayer 20 starts the Re-Establishment process (a request for the Re-Establishment process is input from the RRC of the higher layer to the RLC sublayer 20).
  • the RLC control unit 23 When the RLC sublayer 20 starts the Re-Establishment process, the RLC control unit 23 outputs a reset request to the transmission buffer 21 and the ARQ processing unit 22, so that the RLC-SDU stored in the transmission buffer 21, All the RLC-PDUs in the ARQ process are discarded, and the procedure proceeds to a procedure for starting a new ARQ process.
  • 3GPP TS36.300 “Evolved Universal Terrestrial Radio Access (E-UTRA) nad Evolved Universal Terrestrial Radio Access (E-UTRAN); Overall description; Stage 2” 3GPP, TS36.322 “Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Link Control (RLC) protocol specification” 3GPP, TS36.321 “Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Access (MAC) protocol specification” 3GPP, TS36.323 “Evolved Universal Terrestrial Radio Access (E-UTRA); Packet Data Convergence Protocol (PDCP) protocol specification”
  • RLC Radio Link Control
  • MAC Medium Access
  • MAC Medium Access
  • MAC Packet Data Convergence Protocol
  • PDCP Packet Data Convergence Protocol
  • 19 and 20 are diagrams for explaining the problems of the prior art.
  • the RLC sublayer 20 when a mismatch occurs in the ARQ process performed with the RLC sublayer of the opposite station and the maximum number of retransmissions is exceeded, the RLC sublayer 20 performs the Re-Establishment process. It is activated.
  • the RLC control unit 23 resets the ARQ process, resets all data in the RLC sublayer 20, and starts the ARQ process again.
  • the RLC-SDU and RLC-PDU saved in the RLC sublayer 20 are discarded, and the discarded data is transferred to the RLC of the opposite station. Will not be left.
  • n 10 IP packets are stored in the PDCP buffer 11.
  • the present invention has been made in view of the above, and avoids wasteful IP packet reset processing by Re-Establishment processing, and can prevent loss of data in a layer, a communication method, and communication
  • the purpose is to provide a program.
  • this wireless device is a wireless device capable of transmitting data
  • the communication protocol of the wireless device has an upper layer and a lower layer
  • the lower layer stores the data acquired from the upper layer in the first storage device of the wireless device, and stores the data in the first storage device until transmission confirmation is obtained from the opposite station of the wireless device.
  • a retransmission unit that retransmits the received data to the opposite station, and data that is transmitted to the opposite station when the retransmission unit does not confirm transmission from the opposite station even if the retransmission unit retransmits the data to the opposite station a predetermined number of times.
  • deletion unit that outputs the information of the deleted data to an upper layer, the upper layer, when acquiring the information of the data deleted from the deletion unit, in front
  • a search unit that searches for data corresponding to the deleted data from the data stored in the second storage device of the wireless device, and retransmits the searched data to the lower layer.
  • this radio apparatus even if data is retransmitted to the opposite station by the lower layer retransmission unit a predetermined number of times and transmission confirmation cannot be obtained from the opposite station, only the data transmitted to the opposite station is deleted, and the upper layer is deleted. Since the data deleted by the lower layer is transmitted to the lower layer again, useless IP packet reset processing can be avoided and data loss in the layer can be prevented.
  • FIG. 1 is a functional block diagram of the configuration of the transmission apparatus according to the first embodiment.
  • FIG. 2 is a first diagram for explaining the reset processing of the RLC sublayer.
  • FIG. 3 is a second diagram for explaining the reset processing of the RLC sublayer.
  • FIG. 4 is a diagram for explaining transfer processing of discard information of the RLC sublayer.
  • FIG. 5 is a diagram 1 for explaining the retransmission processing of the PDCP sublayer.
  • FIG. 6 is a second diagram for explaining the retransmission processing of the PDCP sublayer.
  • FIG. 7 is a first diagram for explaining the ARQ process of the RLC sublayer.
  • FIG. 8 is a second diagram for explaining the ARQ process of the RLC sublayer.
  • FIG. 9 is a flowchart of a process procedure of the transmission apparatus according to the first embodiment.
  • FIG. 10 is a diagram illustrating the configuration of the transmission apparatus according to the second embodiment.
  • FIG. 11 is a flowchart of a process procedure performed by the transmission apparatus according to the second embodiment.
  • FIG. 12 is a diagram illustrating a hardware configuration of a computer that configures the transmission apparatus according to the first embodiment.
  • FIG. 13 is a diagram for explaining layer 2 constituting the protocol layer of the conventional mobile communication system.
  • FIG. 14 is a diagram for explaining the flow of data transmitted and received between the sublayers of layer 2.
  • FIG. 15 is a diagram illustrating a configuration of a conventional PDCP sublayer, RLC sublayer, and MAC sublayer.
  • FIG. 16 is a diagram for explaining the flow of conventional SDU discard processing.
  • FIG. 17 is a diagram for explaining the flow of a conventional delivery confirmation process.
  • FIG. 18 is a diagram for explaining the flow of the conventional Re-Establishment process.
  • FIG. 19 is a diagram 1 for explaining the problems of the prior art.
  • FIG. 20 is a second diagram for explaining the problems of the prior art.
  • Embodiments of a wireless device, a communication method, and a communication program according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In this embodiment, the embodiment will be described using a transmission device as an example of a wireless device.
  • the transmission apparatus does not discard all data in the RLC (Radio Link Control) sublayer when an ARQ (Automatic repeat-request) process abnormality occurs and the Re-Establishment process is started. Only the data in which the ARQ process is abnormal is deleted, and the data that has never been transmitted to the opposite station is retained. Then, after the RLC sublayer makes a retransmission request for the discarded data to the PDCP sublayer (upper layer of the RLC sublayer) by the RLC sublayer and complements the discarded data, the transmitting apparatus performs the ARQ process again.
  • RLC Radio Link Control
  • the transmitting apparatus does not discard all the data in the RLC sublayer when the Re-Establishment process is started, but deletes only the data in which the ARQ process is abnormal and deletes the deleted data.
  • the ARQ process since the ARQ process is executed after the retransmission request is made to the PDCP sublayer and the data is complemented, it is possible to avoid a waste disposal process due to the Re-Establishment process and to prevent a loss of data in the layer .
  • FIG. 1 is a functional block diagram of the configuration of the transmission device 100 according to the first embodiment.
  • the transmission device 100 includes a PDCP sublayer 110, an RLC sublayer 120, and a MAC sublayer 130.
  • the transmission apparatus 100 has a plurality of logical channels, and a PDCP sublayer and an RLC sublayer exist for each logical channel.
  • the other configuration is the same as that of a known transmission apparatus having a plurality of layers, and thus description thereof is omitted here.
  • the basic data flow transmitted and received among the PDCP sublayer 110, the RLC sublayer 120, and the MAC sublayer 130 of the transmission apparatus 100 according to the first embodiment is the same as that in FIG. 14 described in the background art. is there.
  • the PDCP sublayer 110 is a layer that transmits / receives user data (IP packets) to / from the upper layer network layer or transmits / receives control data to / from RRC (Radio Resource Control) that is the layer 3. is there.
  • the PDCP sublayer 110 transmits and receives data to and from the RLC sublayer 120 that is a lower sublayer using PDCP-PDU.
  • the PDCP sublayer 110 performs IP header compression / decompression processing, concealment processing, and SDU discard processing on user data, and performs concealment processing, integrity protection, and the like on controller data.
  • the PDCP sublayer 110 includes a PDCP-SDU management buffer 111, an IP header compression unit 112, a concealment processing unit 113, a PDCP-PDU header addition unit 114, and a PDCP control unit 115.
  • a PDCP-SDU management buffer 111 As shown in the upper part of FIG. 1, the PDCP sublayer 110 includes a PDCP-SDU management buffer 111, an IP header compression unit 112, a concealment processing unit 113, a PDCP-PDU header addition unit 114, and a PDCP control unit 115.
  • the PDCP-SDU management buffer 111 stores the converted PDCP-SDU after receiving the IP packet from the network layer and converted into the PDCP-SDU by the PDCP control unit 115.
  • the IP header compression unit 112 acquires the PDCP-SDU from the PDCP-SDU management buffer 111, and compresses the IP header included in the acquired PDCP-SDU.
  • the concealment processing unit 113 acquires the PDCP-SDU with the IP header compressed from the IP header compression unit 112, and executes various concealment processes.
  • the PDCP-PDU header adding unit 114 acquires a PDCP-SDU from the concealment processing unit 113, and generates a PDCP-PDU by adding a control header to the acquired PDCP-SDU.
  • the control header given to the PDCP-SDU includes a sequence number for identifying the order of each PDCP-SDU.
  • the PDCP-PDU header adding unit 114 outputs the PDCP-PDU added with the control header to the RLC sublayer 120.
  • the PDCP control unit 115 controls the entire PDCP sublayer 110.
  • the PDCP control unit 115 has a Discard_Timer management unit 115a.
  • the PDCP control unit 115 activates Discard_Timer for each IP packet of the user data.
  • the target user data IP packet is discarded.
  • the PDCP control unit 115 searches the PDCP-SDU management buffer 111 for the PDCP-SDU corresponding to the sequence number. To do.
  • the PDCP control unit 115 uses the sequence number as the start number and specifies the sequence number that is continuous by the number.
  • the PDCP-SDU corresponding to each identified sequence number is searched from the PDCP-SDU management buffer 111. For example, when the sequence number is “2” and the number is “3”, the PDCP-SDU management buffer 111 is searched for the PDCP-SDU corresponding to the sequence number “2, 3, 4”.
  • the PDCP control unit 115 causes the IP header compression unit 112, the concealment processing unit 113, and the PDCP-PDU header addition unit 114 to process the searched PDCP-SDU with priority over other PDCP-SDUs, and to perform the RLC sublayer.
  • the PDCP-PDU corresponding to the PDCP-PDU (RLC-PDU) reset to 120 is retransmitted to the RLC sublayer 120.
  • the PDCP control unit 115 corresponds to the notified sequence number. It is assumed that the PDCP-SDU to be retransmitted is not executed.
  • the RLC sublayer 120 is a layer that performs retransmission control of data by ARQ. As shown in the middle part of FIG. 1, the RLC sublayer 120 includes a transmission buffer 121, an ARQ processing unit 122, and an RLC control unit 123.
  • the transmission buffer 121 stores the restored RLC-SDU after restoring the PDCP-PDU acquired from the PDCP sublayer 110 into the RLC-SDU based on the content of the control header of the PDCP-PDU. Further, the transmission buffer 121 is identified by setting a flag or the like on the RLC-SDU transmitted to the opposite station even once by the ARQ processing unit 122.
  • the ARQ processing unit 122 acquires a plurality of RLC-SDUs from the transmission buffer 121, creates an RLC-PDU, and outputs the RLC-PDU to the MAC sublayer 130, whereby the RLC-PDU is transmitted to the RLC sublayer of the opposite station. Forward.
  • the ARQ processing unit 122 executes ARQ processing, and outputs transmission confirmation information to the PDCP sublayer 110 when transmission confirmation is obtained with the RLC sublayer of the opposite station.
  • the ARQ processing unit 122 When the transmission confirmation is obtained, the ARQ processing unit 122 outputs the sequence number included in the PDCP-PDU corresponding to the RLC-PDU for which the transmission confirmation has been obtained to the PDCP sublayer 110, thereby confirming the transmission. It is also possible to notify the PDCP sublayer 110 of information indicating that it has been taken.
  • the Re-Establishment process is executed in the RLC sublayer 120. .
  • the RLC control unit 123 controls the entire RLC sublayer 120. For example, when the RLC control unit 123 obtains a data request from the MAC sublayer 130, the RLC control unit 123 notifies the ARQ processing unit 122 of the requested data amount, so that the RLC-PDU for the data corresponding to the request of the MAC sublayer 130 is obtained. Are output from the ARQ processing unit 122 to the MAC sublayer 130.
  • the RLC control unit 123 transmits the RLC-PDU (RLC-SDU) transmitted to the RLC sublayer of the opposite station even once to the ARQ processing unit 122 that is performing the ARQ process.
  • the reset request is not executed for the transmission buffer 121.
  • the ARQ processing unit 122 that has received the reset request from the RLC control unit 123 searches the RLC-SDU transmitted to the RLC sublayer of the opposite station even once, deletes it from the transmission buffer 121, and sets the sequence number of the deleted RLC-SDU to RLC. Output to the control unit 123.
  • the RLC control unit 123 When the RLC control unit 123 obtains a sequence number from the ARQ processing unit 122 after making a reset request to the ARQ processing unit 122, the RLC control unit 123 resets the obtained sequence number by notifying the PDCP sublayer 110 of the sequence number.
  • the retransmission request for the RLC-SDU (PDCP-PDU) is made.
  • the RLC control unit 123 outputs the top sequence number and the number to the PDCP sublayer 110 when there are a plurality of sequence numbers to be notified. For example, if the notified sequence number is “2, 3, 4”, the RLC control unit 123 outputs the sequence number “2” and the number “3” to the PDCP sublayer 110.
  • the ARQ processing unit 122 After the RLC control unit 123 makes a retransmission request for the reset RLC-SDU to the PDCP sublayer 110, when the PDCP-PDU requested for retransmission is retransmitted from the PDCP sublayer 110, the ARQ processing unit 122 An ARQ process is executed with respect to the PDCP-PDU (RLC-SDU) that is prioritized over other RLC-SDUs.
  • the MAC sublayer 130 performs data scheduling with each RLC sublayer mapped to a plurality of logical channels, multiplexes data from the RLC, and multiplexes the data into the MAC sublayer 130.
  • the MAC sublayer 130 executes a process opposite to that at the time of transmission.
  • the MAC sublayer 130 includes a multiplexing unit 131 and a scheduler 132.
  • the multiplexing unit 131 acquires RLC-PDUs from the RLC sublayer of each logical channel, creates a MAC-PDU in which each acquired RLC-PDU is multiplexed, and outputs the created MAC-PDU to layer 1 .
  • the scheduler 132 manages the amount of RLC-PDU data received from each logical channel, and notifies the required amount of data to the RLC sublayer of each logical channel.
  • FIGS. 7 and 8 are diagrams for explaining the ARQ process of the RLC sublayer 120.
  • the reset process of the RLC sublayer 120 will be described. As shown in FIG. 2, when the Re-Establishment process is activated, the RLC control unit 123 does not reset all data in the RLC sublayer by making a reset request to the ARQ processing unit 122. Only RLC-PDUs that have been transmitted even once are discarded, and RLC-SDUs stored in the Transmission buffer 121 that have never been transmitted are kept without being discarded. .
  • the ARQ processing unit 122 notifies the RLC control unit 123 of information (for example, sequence number) of the reset PDCP-PDU.
  • the RLC control unit 123 notifies the PDCP sublayer 110 of the information of the discarded (reset) PDCP-PDU by transferring the sequence number notified from the ARQ processing unit 122 to the PDCP sublayer 110.
  • the ARQ process of the RLC sublayer 120 will be described. As shown in FIG. 7, when a PDCP-PDU is retransmitted from the PDCP sublayer 110, the RLC sublayer 120 preferentially performs an ARQ process on the retransmitted PDCP-PDU (RLC-SDU). Execute.
  • the transmitter 100 according to the first embodiment can transmit all data to the opposite station as shown in FIG.
  • FIG. 9 is a flowchart of a process procedure of the transmission apparatus 100 according to the first embodiment.
  • the ARQ processing unit 122 acquires the RLC-SDU from the transmission buffer 121 (step S101), and starts the ARQ process (step S102).
  • the ARQ processing unit 122 determines whether or not the maximum number of retransmissions has been exceeded (step S103). If the maximum number of retransmissions has not been exceeded (No in step S104), the step The process proceeds to S101.
  • step S104 when the maximum number of retransmissions is exceeded (Yes in step S104), the ARQ processing unit 122 starts the Re-Establishment process (step S105), and the ARQ processing unit 122 is transmitted even once by the ARQ process.
  • the RLC-PDU is discarded (reset), and the RLC-PDU that has never been transmitted is held in the transmission buffer 121 (step S106).
  • the ARQ processing unit 122 derives an RLC-SDU (PDCP-SDU) corresponding to the RLC-PDU targeted for discarding, and the RLC control unit 123 transmits information on the PDCP-PDU targeted for discarding to the PDCP sublayer. (Sequence number) is notified (step S107).
  • PDCP-SDU RLC-SDU
  • the RLC control unit 123 transmits information on the PDCP-PDU targeted for discarding to the PDCP sublayer. (Sequence number) is notified (step S107).
  • the PDCP control unit 115 determines whether or not the Discard_Timer corresponding to the PDCP-PDU to be discarded has timed out (step S108), and when it has timed out (step S109). , Yes), the process proceeds to step S101.
  • the PDCP control unit 115 transfers the data corresponding to the discarded PDCP-PDU to the PDCP-SDU. Obtained from the management buffer 111, again performs IP header compression and concealment processing, and outputs PDCP-PDU to the RLC sublayer 120 (step S110).
  • the RLC sublayer 120 stores the retransmitted PDCP-PDU in the transmission buffer 121 (step S111), and preferentially executes ARQ processing on the PDCP-PDU or RLC-SDU retransmitted from the PDCP sublayer 110 ( In step S112, when there is no PDCP-PDU retransmitted from the PDCP sublayer, the ARQ process is executed on the RLC-SDU held in the transmission buffer 121 (step S113), and the process proceeds to step S103.
  • the transmission apparatus 100 when an ARQ (Automatic repeat-request) process abnormality occurs and the Re-Establishment process is activated, all of the RLC (Radio Link Control) sublayers are activated. Instead of discarding the data, only the data that has become abnormal in the ARQ process is deleted, and the data that has never been transmitted to the opposite station is retained. Then, since the RLC sublayer makes a retransmission request for the discarded data to the PDCP sublayer (upper layer of the RLC sublayer) and complements the discarded data, the transmitting apparatus 100 executes the ARQ process again. It is possible to avoid useless discard processing due to establishment processing and prevent data loss in the layer.
  • ARQ Automatic repeat-request
  • the transmitting apparatus uses the sequence number corresponding to the timed-out PDCP-SDU, By outputting to the RLC sublayer, the RLC-SDU (timed-out RLC-SDU corresponding to PDCP-SDU) stored in the RLC sublayer is discarded.
  • the transmitting apparatus assigns the sequence number corresponding to the timed-out PDCP-SDU to the RLC.
  • the RLC-SDU stored in the RLC sublayer is discarded, so that the processing for the discarding process can be simplified and the load on the transmission apparatus can be reduced.
  • FIG. 10 is a diagram illustrating a configuration of the transmission apparatus 200 according to the second embodiment.
  • the transmission device 200 includes a PDCP sublayer 210, an RLC sublayer 220, and a MAC sublayer 230.
  • the transmission apparatus 200 has a plurality of logical channels, and a PDCP sublayer and an RLC sublayer exist for each logical channel.
  • the other configuration is the same as that of a known transmission apparatus having a plurality of layers, and thus description thereof is omitted here.
  • the basic flow of data transmitted and received among the PDCP sublayer 210, the RLC sublayer 220, and the MAC sublayer 230 of the transmission apparatus 200 according to the second embodiment is the same as that in FIG. 14 described in the background art. is there.
  • the PDCP sublayer 210 is a layer that transmits / receives user data (IP packets) to / from a network layer that is an upper layer or transmits / receives control data to / from RRC that is a layer 3.
  • the PDCP sublayer 210 transmits and receives data to and from the RLC sublayer which is a lower sublayer using PDCP-PDU.
  • the PDCP sublayer 210 performs IP header compression / decompression processing, concealment processing, and SDU discard processing on user data, and performs concealment processing, integrity protection, and the like on controller data.
  • the PDCP sublayer 210 includes a PDCP-SDU management buffer 211, an IP header compression unit 212, a concealment processing unit 213, a PDCP-PDU header adding unit 214, and a PDCP control unit 215. Have.
  • the PDCP-SDU management buffer 211 stores the converted PDCP-SDU after receiving the IP packet from the network layer and converted into the PDCP-SDU by the PDCP control unit 215.
  • the PDCP-SDU transmitted to the RLC sublayer 220 is distinguished from untransmitted PDCP-SDUs using a flag or the like. To do.
  • the IP header compression unit 212 acquires the PDCP-SDU from the PDCP-SDU management buffer 211, and compresses the IP header included in the acquired PDCP-SDU.
  • the concealment processing unit 213 acquires the PDCP-SDU with the IP header compressed from the IP header compression unit 212, and executes various concealment processes.
  • the PDCP-PDU header adding unit 214 acquires the PDCP-SDU from the concealment processing unit 213, and generates a PDCP-PDU by adding a control header to the acquired PDCP-SDU.
  • the control header given to the PDCP-SDU includes a sequence number for identifying the order of each PDCP-SDU.
  • the PDCP-PDU header adding unit 214 outputs the PDCP-PDU added with the control header to the RLC sublayer 220.
  • the PDCP control unit 215 controls the entire PDCP sublayer 210.
  • the PDCP control unit 215 has a Discard_Timer management unit 215a.
  • the PDCP control unit 215 activates Discard_Timer for each IP packet of the user data.
  • the IP packet of the target user data is discarded.
  • the processing of the PDCP control unit 215 when Discard_Timer times out will be specifically described.
  • the PDCP control unit 215 refers to the PDCP-SDU management buffer 211 and determines whether the PDCP-SDU corresponding to the timed-out Discard_Timer has been transmitted to the RLC sublayer 220.
  • the PDCP control unit 215 deletes the PDCP-SDU corresponding to the timed-out Discard_Timer from the PDCP-SDU management buffer 211.
  • the PDCP control unit 215 outputs the sequence number of the PDCP-SDU corresponding to the timed-out Discard_Timer to the RLC sublayer 220. By doing so, the RLC-SDU corresponding to the time-out PDCP-SDU is deleted from the RLC sublayer 220.
  • the RLC sublayer 220 is a layer that performs data retransmission control by ARQ. As shown in the middle part of FIG. 10, the RLC sublayer 220 includes a transmission buffer 221, an ARQ processing unit 222, and an RLC control unit 223.
  • the transmission buffer 221 stores the restored RLC-SDU after restoring the PDCP-PDU acquired from the PDCP sublayer 210 to the RLC-SDU based on the content of the control header of the PDCP-PDU. Further, the transmission buffer 221 is identified by setting a flag or the like on the RLC-SDU transmitted to the opposite station even once by the ARQ processing unit 222.
  • the ARQ processing unit 222 obtains a plurality of RLC-SDUs from the transmission buffer 221 and creates an RLC-PDU, and outputs the RLC-PDU to the MAC sublayer 230, whereby the RLC-PDU is transmitted to the RLC sublayer of the opposite station. Forward.
  • the ARQ processing unit 222 executes ARQ processing, and outputs transmission confirmation information to the PDCP sublayer 210 when transmission confirmation is obtained with the RLC sublayer of the opposite station.
  • the ARQ processing unit 222 When transmission confirmation is obtained, the ARQ processing unit 222 outputs the sequence number included in the PDCP-PDU corresponding to the RLC-PDU for which transmission confirmation has been obtained to the PDCP sublayer 210, thereby confirming transmission. Information indicating that it has been taken can also be notified to the PDCP sublayer 210.
  • the RLC control unit 223 controls the entire RLC sublayer 220. For example, when the RLC control unit 223 obtains a data request from the MAC sublayer 230, the RLC control unit 223 notifies the ARQ processing unit 222 of the requested data amount, so that the RLC-PDU for the data corresponding to the request of the MAC sublayer 230 is obtained. Are output from the ARQ processing unit 222 to the MAC sublayer 230.
  • the RLC control unit 223 transmits the RLC-PDU (RLC-SDU) transmitted to the RLC sublayer of the opposite station even once to the ARQ processing unit 222 during the ARQ process.
  • the reset request is not executed for the transmission buffer 221.
  • the RLC control unit 223 acquires the PDCP-SDU sequence number corresponding to the timed-out Discard_Timer from the PDCP sublayer 210, the RLC control unit 223 transmits the RLC-SDU (PDCP-PDU) corresponding to the acquired sequence number to the transmission buffer. Search from 221.
  • the RLC control unit 223 deletes, from the transmission buffer 221, only the RLC-SDU that has never been transmitted by the ARQ processing unit 222 among the RLC-SDU (PDCP-PDU) retrieved from the transmission buffer 221.
  • the MAC sublayer 230 performs data scheduling with each RLC sublayer mapped to a plurality of logical channels, multiplexes data from the RLC, and multiplexes the data into the MAC sublayer 230.
  • the MAC sublayer 230 includes a multiplexing unit 231 and a scheduler 232.
  • the multiplexing unit 231 acquires RLC-PDUs from the RLC sublayer of each logical channel, creates a MAC-PDU in which each acquired RLC-PDU is multiplexed, and outputs the created MAC-PDU to layer 1 .
  • the scheduler 232 manages the amount of RLC-PDU data received from each logical channel, and notifies the required amount of data to the RLC sublayer of each logical channel.
  • FIG. 11 is a flowchart of a process procedure performed by the transmission apparatus 200 according to the second embodiment.
  • the PDCP sublayer 210 acquires an IP packet (PDCP-SDU) from the network layer and stores it in the PDCP-SDU management buffer 211 (step S201).
  • PDCP-SDU IP packet
  • the PDCP control unit 215 activates the Discard_Timer corresponding to the PDCP-SDU (step S202), determines whether or not the Discard_Timer has timed out (step S203), and if not timed out (step S204, No) ), The process proceeds to step S203.
  • the PDCP control unit 215 determines whether or not the PDCP-SDU corresponding to the timed-out Discard_Timer has been transferred to the RLC sublayer 220 (step S205).
  • the PDCP control unit 215 converts the PDCP-SDU corresponding to the timed-out Discard_Timer to the PDCP-SDU management buffer. It deletes from 211 (step S207), and transfers to step S203.
  • the PDCP control unit 215 sets the sequence number of the PDCP-SDU corresponding to the timed-out Discard_Timer to RLC.
  • the sublayer 220 is notified (step S208).
  • the RLC control unit 223 searches the RLC-PDU to be discarded from the transmission buffer 221 based on the sequence number, and determines whether or not it has never been transmitted (step S209).
  • Step S203 If the RLC-PDU to be discarded has been transmitted even once (No at Step S210), the process proceeds to Step S203.
  • the RLC control unit 223 deletes the RLC-PDU corresponding to the sequence number from the transmission buffer 221 (step S211). ), The process proceeds to step S203.
  • the transmitting apparatus 200 when the Discard_Timer managed by the PDCP sublayer 210 times out and the corresponding PDCP-SDU is output to the RLC sublayer 220, the time-out PDCP -By outputting the sequence number corresponding to the SDU to the RLC sublayer 220, the RLC-SDU (timed-out RLC-SDU corresponding to the PDCP-SDU) stored in the transmission buffer 221 of the RLC sublayer 220 is discarded. Therefore, it is possible to notify the information of data to be discarded by a sequence number, simplify the processing related to the discarding process, and reduce the load on the transmitting apparatus.
  • each component of the transmission apparatuses 100 and 200 shown in FIG. 1 and FIG. 10 is functionally conceptual and does not necessarily need to be physically configured as illustrated.
  • the specific form of distribution / integration of each device is not limited to that shown in the figure, and all or a part thereof may be functionally or physically distributed or arbitrarily distributed in arbitrary units according to various loads or usage conditions. Can be integrated and configured.
  • each processing function performed by each device may be realized by a CPU and a program that is analyzed and executed by the CPU, or may be realized as hardware by wired logic.
  • FIG. 12 is a diagram illustrating a hardware configuration of a computer 300 constituting the transmission device 100 according to the first embodiment (the transmission device 200 according to the second embodiment).
  • this computer (transmitting device) 300 is connected to an input device 301, a display 302, a RAM (Random Access Memory) 303, a ROM (Read Only Memory) 304, and other devices by wire or wirelessly.
  • a communication control device 305 that performs data communication, a medium reading device 306 that reads data from a storage medium, a CPU (Central Processing Unit) 307, and an HDD (Hard Disk Drive) 308 are connected by a bus 309.
  • the layer control program 308b which exhibits the function similar to the function of the transmitter 100 mentioned above is memorize
  • the layer control process 307a is activated.
  • the layer control process 307a corresponds to the PDCP sublayer 110, the RLC sublayer 120, and the MAC sublayer 130 illustrated in FIG.
  • the HDD 308 stores various data 308a used by the layer control process 307a.
  • the CPU 307 reads out various data 308 a stored in the HDD and stores it in the RAM 303, and the layer control process 307 a executes ARQ processing using the various data 303 a stored in the RAM 303.
  • the layer control program 308b shown in FIG. 12 is not necessarily stored in the HDD 308 from the beginning.
  • a “portable physical medium” such as a flexible disk (FD), a CD-ROM, a DVD disk, a magneto-optical disk, or an IC card inserted into a computer, or a hard disk drive (HDD) provided inside or outside the computer.
  • the layer control program 308b is stored in the “fixed physical medium” of “Other computer (or server)” connected to the computer via the public line, the Internet, LAN, WAN, etc. The computer may read out and execute the layer control program 308b from these.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention porte sur un dispositif de transmission qui supprime uniquement des données pour lesquelles une anomalie de traitement ARQ se produit sans abandonner toutes les données d'une sous-couche de commande de liaison radio (RLC) (120) lorsque l'anomalie de traitement de demande automatique de répétition (ARQ) se produit et un traitement de rétablissement est activé et conserve les données qui n'ont jamais été transmises à une station opposée. La sous-couche RLC (120) demande à une sous-couche PDCP (110) de retransmettre les données abandonnées et effectue de nouveau le traitement ARQ une fois que les données abandonnées ont été complétées.
PCT/JP2008/064363 2008-08-08 2008-08-08 Dispositif sans fil, procédé de communication et programme de communication WO2010016150A1 (fr)

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WO2012056701A1 (fr) * 2010-10-27 2012-05-03 パナソニック株式会社 Dispositif de communication et procédé de traitement de données
WO2013066258A2 (fr) 2011-11-04 2013-05-10 Telefonaktiebolaget L M Ericsson (Publ) Gestion de données redondantes dans système de communication
CN110506436A (zh) * 2017-04-14 2019-11-26 富士通株式会社 无线通信装置、无线通信方法及无线通信系统
JP2020520582A (ja) * 2017-08-11 2020-07-09 エルジー エレクトロニクス インコーポレイティド データユニットを送信する方法及び装置

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WO2005109778A1 (fr) * 2004-05-07 2005-11-17 Telefonaktiebolaget Lm Ericsson (Publ) Re-etablissement d'entite de commande de liaison radio (rlc) sans perte evitant la duplication d'unite de donnees de service (sdu)
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WO2012056701A1 (fr) * 2010-10-27 2012-05-03 パナソニック株式会社 Dispositif de communication et procédé de traitement de données
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CN110506436B (zh) * 2017-04-14 2023-11-14 富士通株式会社 无线通信装置、无线通信方法及无线通信系统
JP2020520582A (ja) * 2017-08-11 2020-07-09 エルジー エレクトロニクス インコーポレイティド データユニットを送信する方法及び装置

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