WO2015141478A1 - ユーザ装置及びアップリンクデータ送信方法 - Google Patents
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- 238000004891 communication Methods 0.000 claims description 30
- 230000001174 ascending effect Effects 0.000 claims description 4
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- 230000002776 aggregation Effects 0.000 description 7
- 238000004220 aggregation Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 4
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/15—Setup of multiple wireless link connections
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/02—Data link layer protocols
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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
- H04L2001/0092—Error control systems characterised by the topology of the transmission link
- H04L2001/0093—Point-to-multipoint
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
Definitions
- the present invention relates to a wireless communication system.
- LTE-Advanced Long Term Evolution
- CA carrier aggregation
- CC component carrier
- a user equipment In carrier aggregation, a user equipment (User Equipment: UE) can communicate with a base station (evolved NodeB: eNB) using a plurality of component carriers simultaneously.
- a base station evolved NodeB: eNB
- a highly reliable primary cell Primary Cell: PCell
- a secondary cell Secondary Cell: SCell
- the primary cell is a cell similar to the serving cell of the LTE system, and is a cell for ensuring connectivity between the user apparatus and the network.
- the secondary cell is a cell that is added to the primary cell and set in the user apparatus. The addition and deletion of the secondary cell are executed by RRC (Radio Resource Control) configuration.
- Rel-10 carrier aggregation up to LTE Release 10
- Rel-12 the carrier aggregation of Rel-10 is further expanded, and as shown in the right diagram of FIG. 1, the user apparatus performs simultaneous communication using a plurality of component carriers provided by a plurality of base stations.
- Dual Connectivity is being studied. For example, when all the component carriers cannot be accommodated in a single base station, it is considered that Dual Connectivity is effectively used in order to achieve the same throughput as Rel-10.
- the user equipment divides one EPS (Evolved Packet System) bearer or packet sequence by a predetermined method, and each divided packet sequence is a plurality of base stations.
- Bearer splitting Bearer Splitting
- eNB # 2 When receiving the divided packet sequence via CC # 2, eNB # 2, which is a non-anchor node base station, transfers the received packet sequence to eNB # 1, which is an anchor base station.
- eNB # 1 When the packet sequence transferred from eNB # 2 is received, eNB # 1 reorders the packet sequence received via CC # 1 and the packet sequence received from eNB # 2, thereby receiving a packet sequence from the user apparatus. And reconstructed packet sequence is transferred to the core node (CN).
- CN core node
- the proposed semi-static data amount ratio setting method may not be able to improve the uplink throughput if the data amount ratio is not set appropriately. For example, if the communication quality deteriorates and the throughput sufficient to transmit the data allocated to a certain cell cannot be realized, the data allocated to the cell stays in the transmission buffer that holds the uplink data to be transmitted Will do.
- an object of the present invention is to provide a technique for efficiently transmitting uplink data in dual connectivity.
- an aspect of the present invention is a user apparatus having a dual connectivity function that simultaneously communicates with a plurality of base stations, and each base station of the plurality of base stations from uplink data to be transmitted
- a PDCP (Packet Data Convergence Protocol) layer processing unit that generates a packet sequence to be transmitted to the base station
- an RLC (Radio Link Control) layer processing unit that transmits the generated packet sequence to the plurality of base stations
- the RLC layer processing unit is provided corresponding to each RLC buffer that stores packets addressed to each base station of the plurality of base stations transmitted from the PDCP layer processing unit, and each base station of the plurality of base stations.
- Packets stored in the RLC buffer A RLC entity that transmits a packet to a corresponding base station, and an RLC entity control unit that controls the RLC buffer and the RLC entity, wherein the RLC entity control unit stores each packet stored in the RLC buffer.
- An RLC discard timer that counts time, and the RLC entity control unit discards the staying packet whose RLC discard timer has expired from the RLC buffer, and sets the staying packet as a packet addressed to another base station.
- the present invention relates to a user apparatus that notifies the PDCP layer processing unit to retransmit the packet and transmits a stay packet retransmitted from the PDCP layer processing unit from an RLC entity corresponding to the other base station.
- Another aspect of the present invention is an uplink data transmission method in a user apparatus having a dual connectivity function for simultaneous communication with a plurality of base stations, wherein a PDCP (Packet Data Convergence Protocol) layer processing unit is an uplink to be transmitted.
- a PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- the RLC layer processing unit starts an RLC discard timer that times the packet residence time, and the RLC layer processing unit has expired the RLC discard timer.
- the RLC layer processing unit discards the stay packet from the RLC buffer and resends the stay packet to the RLC buffer as a packet addressed to another base station. Notifying the PDCP layer processing unit, the PDCP layer processing unit retransmitting the notified stay packet to the RLC buffer as a packet addressed to the other base station, and the RLC layer processing unit, And transmitting the retransmitted stay packet to the other base station.
- FIG. 1 is a schematic diagram illustrating carrier aggregation.
- FIG. 2 is a schematic diagram showing a bearer split in Dual Connectivity.
- FIG. 3 is a schematic diagram illustrating a wireless communication system according to an embodiment of the present invention.
- FIG. 4 is a block diagram illustrating a configuration of a user apparatus according to an embodiment of the present invention.
- FIG. 5 is a schematic diagram illustrating uplink data transmission processing according to an embodiment of the present invention.
- FIG. 6 is a sequence diagram illustrating an uplink data transmission process according to an embodiment of the present invention.
- the PDCP layer processing unit of the user apparatus generates a packet sequence to be transmitted to each base station from the uplink data to be transmitted, and the packet sequence generated by the RLC layer processing unit. Send.
- the RLC layer processing unit of the user apparatus starts an RLC discard timer that counts the residence time of the packet. After that, the RLC layer processing unit transmits each packet stored in the RLC buffer to the base station that is the destination of the packet, while staying in the RLC buffer for a predetermined time or longer due to a transmission delay that occurs with a certain base station.
- the RLC layer processing unit When a packet whose RLC discard timer has expired is detected, the detected stay packet is discarded from the RLC buffer and the stay packet is tried to be transmitted to another base station. For this reason, the RLC layer processing unit notifies the PDCP layer processing unit to retransmit the staying packet as a packet addressed to another base station. Upon receiving the notification, the PDCP layer processing unit retransmits the notified stay packet as a packet addressed to another base station, and the RLC layer processing unit transmits the retransmitted stay packet to another base station.
- the method of semi-statically setting the ratio for allocating packets to be transmitted to a plurality of base stations even if a delay occurs in communication with any of the base stations, a transmission delay of a predetermined time or more is caused.
- the generated packet can be quickly transmitted via another base station.
- the RLC layer may autonomously discard it, or after making a notification to the PDCP layer, it may discard it with an instruction from the PDCP layer.
- FIG. 3 is a schematic diagram illustrating a wireless communication system according to an embodiment of the present invention.
- the wireless communication system 10 includes a user device 100 and base stations 200A and 200B.
- the radio communication system 10 supports Dual Connectivity in which the user apparatus 100 performs simultaneous communication using component carriers CC # 1 and CC # 2 provided by a plurality of base stations 200A and 200B, and as illustrated, the user apparatus 100 communicates between the master base station (MeNB) 200A and the secondary base station (SeNB) 200B using the Dual Connectivity function.
- MeNB master base station
- SeNB secondary base station
- only two base stations 200 ⁇ / b> A and 200 ⁇ / b> B are shown, but in general, a large number of base stations 200 are arranged to cover the service area of the wireless communication system 100.
- User apparatus 100 has a dual connectivity function for simultaneous communication with a plurality of base stations 200A and 200B.
- the user apparatus 100 may be any appropriate information processing apparatus having a wireless communication function, such as a smartphone, a mobile phone, a tablet, or a mobile router, as illustrated.
- the user apparatus 100 includes a CPU (Central Processing Unit) such as a processor, a memory apparatus such as a RAM (Random Access Memory) and a flash memory, a wireless communication apparatus for transmitting and receiving radio signals to and from the base stations 200A and 200B, and the like. Composed.
- each function and process of the user device 100 described later may be realized by the CPU processing or executing data or a program stored in the memory device.
- the user apparatus 100 is not limited to the hardware configuration described above, and may be configured by a circuit that realizes one or more of the processes described below.
- Base stations 200 ⁇ / b> A and 200 ⁇ / b> B are networks such as upper stations and servers that are connected to a core network (not shown) by wireless connection with user apparatus 100.
- the downlink (DL) packet received from the device is transmitted to the user device 100
- the uplink (UL) packet received from the user device 100 is transmitted to the network device.
- the base station 200A functions as a master base station (MeNB) or a primary base station
- the base station 200B functions as a secondary base station (SeNB).
- the master base station 200A controls simultaneous communication between the user apparatus 100 and the base stations 200A and 200B by dual connectivity and also controls communication with a higher-level core network (not shown). .
- the master base station 200A sets the secondary cell CC # 2 of the secondary base station 200B for the user apparatus 100, and receives the uplink data received via the primary cell CC # 1 and the secondary cell CC # 2. Transfer to the core network. Specifically, the user apparatus 100 divides the uplink data into two packet sequences according to a predetermined division method, and the divided packet sequences are respectively transmitted to the master base station 200A and the secondary base station via CC # 1 and CC # 2. Transmit to station 200B. When receiving the divided packet sequence from the user apparatus 100, the secondary base station 200B transfers the received packet sequence to the master base station 200A.
- the master base station 200A When the transferred packet sequence is received, the master base station 200A performs a reordering process on the packet received from the secondary base station 200B and the packet received from the user apparatus 100 via CC # 1, thereby generating a packet. Reconstruct the sequence and transfer the reconstructed packet sequence to the core network.
- FIG. 4 is a block diagram illustrating a configuration of a user apparatus according to an embodiment of the present invention.
- the user apparatus 100 includes a PDCP layer processing unit 110 and an RLC layer processing unit 120. Further, the RLC layer processing unit 120 is provided with an RLC buffer 121 and RLC entities 122_1, 122_2,... (Corresponding to the RLC entity 122 in the following description). And RLC entity control unit 123.
- the PDCP layer processing unit 110 generates a packet sequence to be transmitted to each of the base stations 200A and 200B from the uplink data to be transmitted. Specifically, as shown in the upper left diagram of FIG. 5, the PDCP layer processing unit 110 receives a PDCP SDU (Service Data Unit) to be transmitted from an upper layer, and the received PDCP SDU is converted into a PDCP PDU (Protocol Data PDU). Unit). The PDCP layer processing unit 110 transmits the generated PDCP PDU to the RLC layer processing unit 120 as a packet addressed to the master base station (MeNB) 200A and a packet addressed to the secondary base station (SeNB) 200B according to a predetermined division method. .
- MeNB master base station
- SeNB secondary base station
- the PDCP layer processing unit 110 receives a division ratio for dividing and transmitting uplink data to be transmitted to a plurality of base stations 200 (bearer split), and transmits to each base station 200 according to the received division ratio.
- a packet sequence to be transmitted may be generated.
- the PDCP layer processing unit 110 uses a PDCP PDU having an odd sequence number (SN) as a packet addressed to the master base station 200A, and a PDCP PDU having an even sequence number (SN) as a packet addressed to the secondary base station 200B. May be transmitted to the RLC layer processing unit 120.
- SN odd sequence number
- SN even sequence number
- the present invention is not limited to this, and any other appropriate division ratio may be applied.
- the PDCP layer processing unit 110 may have a PDCP discard timer for discarding a packet held in the PDCP layer processing unit 110.
- the PDCP layer processing unit 110 holds the transmitted PDCP PDU in a buffer (not shown) for a subsequent retransmission for a predetermined period after transmitting the PDCP PDU to the RLC layer processing unit 120.
- the PDCP discard timer set for each PDCP PDU expires and the predetermined period elapses, the PDCP layer processing unit 110 may discard the PDCP PDU.
- the RLC layer processing unit 120 transmits the packet sequence generated by the PDCP layer processing unit 110 to the plurality of base stations 200.
- the RLC layer processing unit 120 includes an RLC buffer 121 that stores packets addressed to the base stations 200 of the plurality of base stations 200 transmitted from the PDCP layer processing unit 110, and each base station of the plurality of base stations 200. 200, RLC entities 122_1, 122_2,... (Hereinafter may be collectively referred to as RLC entities 122) that transmit packets stored in the RLC buffer 121 to the corresponding base station 200, and RLC An RLC entity control unit 123 that controls the buffer 121 and the RLC entity 122 is included.
- the RLC layer processing unit 120 receives the PDCP PDU from the PDCP layer processing unit 110 and stores the received PDCP PDU in the RLC buffer 121.
- the RLC entity 122_1 (RLC (MeNB)) corresponding to the master base station 200A and the RLC entity 122_2 (RLC (SeNB)) corresponding to the secondary base station 200B are When radio resources or transport blocks (TB) for transmission are allocated by the stations 200A and 200B, PDCP PDUs destined for the corresponding base station are extracted from the RLC buffer 121.
- the RLC entities 122_1 and 122_2 respectively convert the extracted PDCP PDUs to RLC PDUs, and map the generated RLC PDUs to the assigned radio resources or transport blocks, thereby transmitting to the corresponding base stations 200A and 200B. To do.
- the RLC entity 122 when transmission of packets from the RLC entity 122 to the base station 200 is delayed due to degradation of communication quality or the like, the RLC entity 122 is used for transmission to the corresponding base station 200 as shown in the upper right diagram of FIG.
- the allocation of radio resources or transport blocks will be delayed or stopped, and the generation of RLC PDUs in the RLC entity 122 will also be delayed or stopped.
- the generation of the RLC PDU is delayed or stopped, the PDCP PDU addressed to the base station stored in the RLC buffer 121 stays.
- the RLC layer processing unit 120 receives the PDCP PDU addressed to the base station from the PDCP layer processing unit 110, the received PDCP PDU is not transmitted to the base station 200 and stays in the RLC buffer 121. In addition to delaying transmission of uplink data to be transmitted, there is a possibility that the RLC buffer 121 overflows.
- the RLC entity control unit 123 In order to manage the residence time of packets in the RLC buffer 121, the RLC entity control unit 123 has an RLC discard timer (RLC Discard Timer) that counts the residence time of each packet in the packet sequence stored in the RLC buffer 121. Have. In order to avoid the transmission delay or overflow described above, the RLC entity control unit 123 discards the stay packet whose RLC discard timer has expired from the RLC buffer 121, and stores the stay packet in the RLC buffer 121 as a packet addressed to another base station. The PDCP layer processing unit 110 is notified to retransmit, and the stay packet retransmitted from the PDCP layer processing unit 110 is transmitted from the RLC entity 122 corresponding to another base station. For example, as shown in the lower left diagram of FIG.
- RLC Discard Timer RLC Discard Timer
- the RLC entity control unit 123 removes the packet from the RLC buffer 121.
- the PDCP layer processing unit 110 is notified to retransmit the stay packet as a packet addressed to the master base station 200A.
- the PDCP layer processing unit 110 transmits the notified PDCP PDU as a packet addressed to the master base station 200A to the RLC layer processing unit 120, and the RLC entity 122_1 transmits the retransmitted PDCP PDU to the master base. Transmit to station 200A.
- the RLC layer processing unit 120 transmits a packet in which transmission to a certain base station 200 is delayed due to degradation of a communication state or the like via another base station 200, thereby transmitting uplink data transmission delay. Can be effectively suppressed.
- the RLC entity 122_1 corresponding to the master base station 200A may preferentially transmit the packet retransmitted from the PDCP layer processing unit 110.
- the master base station 200A can quickly receive the staying packet that has not been transferred from the secondary base station 200B, and the reordering process that has been delayed by waiting for the staying missing packet can be performed. It becomes possible to resume early.
- a transmission delay occurs in the secondary base station 200 ⁇ / b> B, but the present invention is not limited to this, and similarly applies to a case where a transmission delay occurs in the master base station 200 ⁇ / b> A. Is possible.
- the RLC entity control unit 123 may start the RLC discard timer when each packet is stored in the RLC buffer 121, and stop the RLC discard timer when at least a part of the packet is transmitted. Specifically, the RLC entity control unit 123 may stop the RLC discard timer when at least part of the RLC PDU is mapped to the transport block for transmission.
- the RLC entity control unit 123 may set the expiration time of the RLC discard timer according to the bearer type or the logical channel type of the packet. For example, for the bearer type or logical channel where a large transmission delay is not allowed, the expiration time of the RLC discard timer may be set to a relatively short time. On the other hand, for bearer types or logical channels that allow a certain amount of delay, the expiration time of the RLC discard timer may be set to a relatively long time. In another embodiment, the RLC entity control unit 123 may set the expiration time of the RLC discard timer to the time notified by RRC from the plurality of base stations 200.
- the expiration time of the RLC discard timer may be notified by an RRC message from the master base station 200A.
- the RLC entity control unit 123 may stop the RLC discard timer corresponding to the packet for which the PDCP discard timer has expired. That is, a packet whose PDCP discard timer has expired is discarded in the PDCP layer processing unit 110. For this reason, the RLC entity control unit 123 cannot retransmit the stay packet to the PDCP layer processing unit 110 even if the RLC discard timer continues counting, in order to avoid unnecessary counting of the RLC discard timer.
- the RLC discard timer may be stopped.
- the PDCP layer processing unit 110 sets the base station 200 in descending or ascending order of indexes of these base stations 200.
- the base station 200 that retransmits the stay packet according to a predetermined selection criterion including the descending or ascending order of the index of the cell group and the communication quality or average throughput of communication between each base station 200 and the user apparatus 100. You may choose.
- the RLC layer processing unit 120 discards the staying packet from the RLC buffer 121 and receives the staying packet retransmitted from the PDCP layer processing unit 110, the staying amount of data in each RLC entity 122 changes.
- a plurality of base stations 200 may be notified of BSR (Buffer Status Report) for notifying that it has been performed.
- each RLC buffer 121 is shared by each RLC entity 122, but the present invention is not limited to this.
- each RLC entity 122 may have its own RLC buffer 121.
- each RLC buffer 121 stores a packet addressed to the base station 200 corresponding to the RLC entity 122.
- FIG. 6 is a sequence diagram illustrating an uplink data transmission process in the user apparatus according to an embodiment of the present invention.
- the PDCP layer processing unit 110 in step S101, the PDCP layer processing unit 110 generates a packet sequence to be transmitted to each base station 200 of the plurality of base stations 200 from the uplink data to be transmitted.
- the PDCP layer processing unit 110 receives a PDCP SDU to be transmitted from an upper layer, and converts the received PDCP SDU into a PDCP PDU.
- the PDCP layer processing unit 110 transmits the generated packet sequence to the RLC layer processing unit 120.
- the PDCP layer processing unit 110 performs each RCP layer as a packet addressed to the master base station 200A or the secondary base station 200B according to a predetermined division method such as division based on a predetermined division ratio (bearer split). Transmit to the processing unit 120.
- the division ratio may be notified from the master base station 200A.
- step S103 when each packet of the packet sequence received in step S102 is stored in the RLC buffer 121, the RLC layer processing unit 120 starts an RLC discard timer (RLC Discard Timer) that measures the residence time of the packet. .
- RLC discard Timer RLC Discard Timer
- the RLC layer processing unit 120 transmits the packet stored in the RLC buffer 121 to the destination base station 200.
- the RLC layer processing unit 120 extracts a PDCP PDU addressed to the base station 200 from the RLC buffer 121 when a transmission radio resource or a transport block (TB) is allocated by the destination base station 200. Then, the extracted PDCP PDU is converted to RLC PDU. Then, the RLC layer processing unit 120 transmits the generated RLC PDU to the base station 200 by mapping the generated RLC PDU to the assigned radio resource or transport block.
- TB transport block
- the RLC layer processing unit 120 detects in the RLC buffer 121 a staying packet whose RLC discard timer has expired. For example, when transmission of packets from the RLC layer processing unit 120 to the base station 200 is delayed due to degradation of communication quality, the RLC layer processing unit 120 allocates radio resources or transport blocks for transmission by the base station 200. Delay and RLC PDU generation will be delayed or stopped. As a result, the PDCP PDU stored in the RLC buffer 121 stays, and transmission of uplink data is delayed. In order to manage such transmission delay, the RLC layer processing unit 120 detects a PDCP PDU that has stayed for a predetermined time by using an RLC discard timer.
- step S106 the RLC layer processing unit 120 discards the staying packet from the RLC buffer 121.
- the RLC layer processing unit 120 determines that the PDCP PDU whose RLC discard timer has expired is a staying packet, and discards the PDCP PDU from the RLC buffer 121.
- the RLC layer processing unit 120 notifies the PDCP layer processing unit 110 to retransmit the detected staying packet as a packet addressed to another base station 200. For example, when transmission to the secondary base station 200B is delayed and a stay packet addressed to the secondary base station 200B is detected in the RLC buffer 121, the RLC layer processing unit 120 transmits the stay packet via the master base station 200A. The PDCP layer processing unit 110 is notified to retransmit the staying packet as a packet addressed to the master base station 200A.
- step S108 the PDCP layer processing unit 110 retransmits the notified stay packet to the RLC layer processing unit 120 as a packet addressed to another base station 200.
- the PDCP layer processing unit 110 retransmits the staying packet notified by the RLC layer processing unit 120 as a packet addressed to the master base station 200A.
- step S109 the RLC layer processing unit 120 transmits the retransmitted stay packet from the RLC entity 122 corresponding to the other base station 200.
- the RLC layer processing unit 120 transmits the stay packet retransmitted from the PDCP layer processing unit 110 from the RLC entity 122_1 corresponding to the master base station 200A.
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Abstract
Description
100 ユーザ装置
200A,200B 基地局
Claims (10)
- 複数の基地局と同時通信するDual Connectivity機能を有するユーザ装置であって、
送信対象のアップリンクデータから、前記複数の基地局の各基地局に送信されるパケットシーケンスを生成するPDCP(Packet Data Convergence Protocol)レイヤ処理部と、
前記生成されたパケットシーケンスを前記複数の基地局に送信するRLC(Radio Link Control)レイヤ処理部と、
を有し、
前記RLCレイヤ処理部は、
前記PDCPレイヤ処理部から送信された前記複数の基地局の各基地局宛のパケットを格納するRLCバッファと、
前記複数の基地局の各基地局に対応して設けられ、前記RLCバッファに格納されたパケットを対応する基地局に送信するRLCエンティティと、
前記RLCバッファ及び前記RLCエンティティを制御するRLCエンティティ制御部と、
を有し、
前記RLCエンティティ制御部は、前記RLCバッファに格納された各パケットの滞留時間を計時するRLC破棄タイマを有し、
前記RLCエンティティ制御部は、前記RLC破棄タイマが満了した滞留パケットを前記RLCバッファから破棄し、前記滞留パケットを他の基地局宛てのパケットとして前記RLCバッファに再送するよう前記PDCPレイヤ処理部に通知し、前記PDCPレイヤ処理部から再送された滞留パケットを前記他の基地局に対応するRLCエンティティから送信するユーザ装置。 - 前記PDCPレイヤ処理部は、前記送信対象のアップリンクデータを前記複数の基地局に分割送信するための分割比率を受信し、前記分割比率に従って前記複数の基地局の各基地局に送信されるパケットシーケンスを生成する、請求項1記載のユーザ装置。
- 前記RLCエンティティ制御部は、各パケットが前記RLCバッファに格納されると前記RLC破棄タイマを起動し、前記パケットの少なくとも一部が送信されると前記RLC破棄タイマを停止する、請求項1又は2記載のユーザ装置。
- 前記PDCPレイヤ処理部は、該PDCPレイヤ処理部に保持されるパケットを破棄するためのPDCP破棄タイマを有し、
前記RLCエンティティ制御部は、前記PDCP破棄タイマが満了したパケットについて、該パケットに対応する前記RLC破棄タイマを停止する、請求項1乃至3何れか一項記載のユーザ装置。 - 前記RLCエンティティ制御部は、ベアラ種別又は論理チャネル種別に応じて前記RLC破棄タイマの満了時間を設定する、請求項1乃至4何れか一項記載のユーザ装置。
- 前記RLCエンティティ制御部は、前記複数の基地局からRRC(Radio Resource Control)により通知された時間に前記RLC破棄タイマの満了時間を設定する、請求項1乃至4何れか一項記載のユーザ装置。
- 前記複数の基地局が3つ以上の基地局を含む場合、前記PDCPレイヤ処理部は、前記複数の基地局のインデックスの降順又は昇順、前記複数の基地局により設定されたセルグループのインデックスの降順又は昇順、及び前記複数の基地局と当該ユーザ装置との間の通信の通信品質又は平均スループットの何れかを含む所定の選択基準に従って前記滞留パケットを再送する基地局を選択する、請求項1乃至6何れか一項記載のユーザ装置。
- 前記他の基地局に対応するRLCエンティティは、前記PDCPレイヤ処理部から再送された滞留パケットを優先的に送信する、請求項1乃至7何れか一項記載のユーザ装置。
- 前記RLCレイヤ処理部は、前記RLCバッファから前記滞留パケットを破棄し、前記PDCPレイヤ処理部から再送された滞留パケットを受信すると、各RLCエンティティにおけるデータ滞留量が変化したことを通知するBSR(Buffer Status Report)を前記複数の基地局に通知する、請求項1乃至8何れか一項記載のユーザ装置。
- 複数の基地局と同時通信するDual Connectivity機能を有するユーザ装置におけるアップリンクデータ送信方法であって、
PDCP(Packet Data Convergence Protocol)レイヤ処理部が、送信対象のアップリンクデータから、前記複数の基地局の各基地局に送信されるパケットシーケンスを生成し、RLC(Radio Link Control)レイヤ処理部に前記生成されたパケットシーケンスを送信するステップと、
前記パケットシーケンスの各パケットがRLCバッファに格納されると、前記RLCレイヤ処理部が、該パケットの滞留時間を計時するRLC破棄タイマを起動するステップと、
前記RLCレイヤ処理部が、前記RLC破棄タイマが満了した滞留パケットを前記RLCバッファにおいて検出するステップと、
前記RLCレイヤ処理部が、前記滞留パケットを前記RLCバッファから破棄し、前記滞留パケットを他の基地局宛てのパケットとして前記RLCバッファに再送するよう前記PDCPレイヤ処理部に通知するステップと、
前記PDCPレイヤ処理部が、前記通知された滞留パケットを前記他の基地局宛てのパケットとして前記RLCバッファに再送するステップと、
前記RLCレイヤ処理部が、前記再送された滞留パケットを前記他の基地局に送信するステップと、
を有するアップリンクデータ送信方法。
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