WO2016021662A1 - ユーザ装置及び基地局 - Google Patents
ユーザ装置及び基地局 Download PDFInfo
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- WO2016021662A1 WO2016021662A1 PCT/JP2015/072282 JP2015072282W WO2016021662A1 WO 2016021662 A1 WO2016021662 A1 WO 2016021662A1 JP 2015072282 W JP2015072282 W JP 2015072282W WO 2016021662 A1 WO2016021662 A1 WO 2016021662A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/25—Maintenance of established connections
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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
- H04W16/24—Cell structures
- H04W16/32—Hierarchical cell structures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/10—Flow control between communication endpoints
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/04—Reselecting a cell layer in multi-layered cells
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/27—Transitions between radio resource control [RRC] states
Definitions
- 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
- SCG secondary cell group
- 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 Dual Connectivity: DC
- DC Dual Connectivity
- the user equipment has a physical layer (PHY) for the master base station, a MAC (Medium Access Control) layer (m ⁇ MAC) and RLC (Radio Link Control) layer (m-RLC), PHY layer for secondary base station, s-MAC layer and s-RLC layer, and m-RLC layer and s-RLC layer With PDCP layer.
- PHY physical layer
- MAC Medium Access Control
- m-RLC Radio Link Control
- the PDCP layer does not update the reception window when the PDCP sequence number of the received packet is discontinuous, while the newly transmitted RLC SDU.
- the PDCP layer updates the reception window even when the PDCP sequence number of the received packet is discontinuous.
- the above processing at the time of handover or reconnection is not executed at present.
- the split bearer when the split bearer is deleted, RLC PDUs # 1 to ## that are waiting for reordering due to the fact that RLC PDU # 0 is not received by the s-RLC layer in downlink communication. All 4 will be discarded.
- the master base station needs to retransmit not only RLC PDU # 0 waiting for reception but also RLC PDU # 1 to # 4 received in the s-RLC layer of the user equipment. , Throughput decreases.
- the downlink packet can be transmitted from both the master base station and the secondary base station.
- FIG. 4 shows a case where the packet is transmitted only from the secondary base station.
- the secondary base station may stop receiving from the user equipment after the uplink transmission change instruction, and RLC PDUs # 0 to # 3 generated from PDCP PDUs # 0 to # 3 are unnecessary. Will be sent.
- the user equipment transmits the packet after RLC PDU # 4 to the changed master base station.
- the secondary base station does not receive RLC PDU # 0 to # 3
- the master base station sends RLC PDU # 0.
- RLC PDU # 4 will be received before # 3. Since the re-establishment process is not executed, the PDCP layer of the master base station discards RLC PDUs # 0 to # 3 that arrive thereafter from outside the reception window range.
- an object of the present invention is to provide a technique for realizing efficient transmission of uplink packets when the uplink transmission direction of a split bearer is changed.
- one feature of the present invention is that a transmitter / receiver that communicates simultaneously with a master base station and a secondary base station by dual connectivity, an RLC (Radio Link Control) layer for the master base station, and the secondary base RLC layer processing unit having an RLC layer for the station, and a PDCP (Packet Data Convergence Protocol) layer for transmitting and receiving data between the RLC layer for the master base station and the RLC layer for the secondary base station
- a user equipment having a PDCP layer processing unit, and when changing a transmission direction of an uplink data packet in a split bearer set for the master base station and the secondary base station,
- the LC layer processing unit performs re-establishment processing on the RLC layer for the master base station and the RLC layer for the secondary base station, and the PDCP layer processing unit re-establishes the PDCP layer.
- the present invention relates to a user apparatus that executes an establishment process.
- FIG. 1 is a schematic diagram illustrating carrier aggregation.
- FIG. 2 is a schematic diagram showing a split bearer having a macro base station as an anchor node.
- FIG. 3 is a diagram illustrating a layer configuration for downlink communication at the time of setting a split bearer.
- FIG. 4 is a schematic diagram showing a process when a conventional split bearer is deleted.
- FIG. 5 is a schematic diagram showing a conventional process when changing the uplink transmission direction.
- FIG. 6 is a schematic diagram illustrating a wireless communication system according to an embodiment of the present invention.
- FIG. 7 is a block diagram illustrating a configuration of a user apparatus according to an embodiment of the present invention.
- FIG. 1 is a schematic diagram illustrating carrier aggregation.
- FIG. 2 is a schematic diagram showing a split bearer having a macro base station as an anchor node.
- FIG. 3 is a diagram illustrating a layer configuration for downlink communication at the time of setting a split bearer.
- the PDCP PDU waiting for reordering is sent to the upper layer. This makes it possible to avoid a situation in which a PDCP PDU waiting for reordering cannot be transmitted to an upper layer even when the missing RLC PDU is not transmitted to the user apparatus due to discarding or the like.
- FIG. 6 is a schematic diagram illustrating a wireless communication system according to an embodiment of the present invention.
- 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, a mobile router, and a wearable terminal 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, and 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 RLC layer processing unit 120 includes an RLC (m-RLC) layer 121 for the master base station 200A and an RLC (s-RLC) layer for the secondary base station 200B.
- the m-RLC layer 121 configures an RLC SDU from the RLC PDU received from the master base station 200A and transmits the RLC SDU to the PDCP layer processing unit 130.
- the s-RLC layer 122 configures an RLC SDU from a packet (RLC PDU) received from the secondary base station 200B, and transmits the RLC SDU to the PDCP layer processing unit 130.
- the transmitting base station 200A or 200B determines that the packet has been discarded, and updates the reception window.
- the PDCP layer 131 distributes a PDCP PDU to be transmitted into a packet to be transmitted to the master base station 200A and a packet to be transmitted to the secondary base station 200B, and the distributed packet is m-RLC. Transmit to the layer 121 and the s-RLC layer 122.
- the PDCP layer processing unit 130 when the PDCP layer processing unit 130 receives RLC SDUs # 1 to # 4 reconfigured from the s-RLC layer 122, the PDCP layer processing unit 130 performs mastering for reordering. It will wait for reception of RLC SDU # 0 retransmitted from base station 200A.
- the master base station 200A discards the RLC SDU # 0
- the PDCP layer processing unit 130 cannot receive the RLC SDU # 0, and sends RLC SDUs # 1 to # 4 waiting for reordering to the upper layer. I can't do that. For this reason, even when the re-establishment process is performed on the s-RLC layer 122, it is not desirable from the viewpoint of performance that the PDCP layer processing unit 130 performs the reordering as in the related art.
- step S ⁇ b> 101 the master base station 200 ⁇ / b> A sets a split bearer for the user apparatus 100.
- the split bearer setting instruction may be notified by RRC signaling, for example.
- step S102 the master base station 200A instructs the user apparatus 100 to delete the split bearer.
- the split bearer deletion instruction may be notified by RRC signaling, for example.
- the RLC layer processing unit 120 when changing the transmission direction of the uplink data packet in the split bearer set for the master base station 200A and the secondary base station 200B, the RLC layer processing unit 120 The re-establishment process is executed on the m-RLC layer 121 for the secondary base station 200B and the s-RLC layer 122 for the secondary base station 200B, and the PDCP layer processing unit 130 executes the re-establishment process on the PDCP layer 131 .
- the RLC layer processing unit 120 when an uplink transmission direction change instruction is received from the master base station 200A or the secondary base station 200B, the RLC layer processing unit 120 performs re-processing on the m-RLC layer 121 and the s-RLC layer 122.
- -Establishment is executed, and the PDCP layer processing unit 130 executes re-establishment for the PDCP layer 131.
- the re-establishment process may be performed only for uplink communication.
- the RLC layer processing unit 120 and the PDCP layer processing unit 130 perform re-establishment processing only for the part related to uplink communication with respect to the RLC layers 121 and 122 and the PDCP layer 131. You may make it perform. If the re-establishment process is executed for the part related to the downlink communication, the downlink communication is interrupted, and this is avoided.
- step S303 the RLC layer processing unit 120 and the PDCP layer processing unit 130 perform re-establishment processing on the m-RLC layer 121, the s-RLC layer 122, and the PDCP layer 131, respectively.
- the RLC layer processing unit 120 and the PDCP layer processing unit 130 stop transmission of the uplink data packet allocated before the transmission direction is changed, and transmit the stopped uplink data packet to the sequence number.
- the re-establishment process may be performed on the RLC layers 121 and 122 and the PDCP layer 131 so as to transmit to the base station 200 to which the transmission direction is changed in order.
- the RLC layer processing unit 220 includes an RLC layer 221 for communication with the user apparatus 100.
- the RLC layer processing unit 220 configures the RLC SDU from the RLC PDU received from the user apparatus 100 via the lower layer, and when the base station 200 is an anchor node of the split bearer, the configured RLC The SDU is transmitted to the PDCP layer processing unit 230 of the own station.
- the base station 200 is not a split bearer anchor node
- the configured RLC SDU is transmitted to the PDCP layer processing unit 230 of the anchor base station 200.
- first embodiment and the second embodiment described above may be used separately, or may be used in combination.
- the first embodiment when a split bearer is applied, the first embodiment may be applied to downlink communication, and the second embodiment may be applied to uplink communication. That is, in the downlink communication, when the split bearer set for the secondary base station 200B is deleted, the user apparatus 100 performs re-establishment processing on the s-RLC layer 122 for the secondary base station 200B.
- the user apparatus 100 may execute re-establishment processing for the m-RLC layer 121 for the master base station 200A, the s-RLC layer 122 for the secondary base station 200B, and the PDCP layer 131. Good.
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Abstract
Description
100 ユーザ装置
110、210 送受信部
120、220 RLCレイヤ処理部
130、230 PDCPレイヤ処理部
200 基地局
Claims (9)
- デュアルコネクティビティによりマスタ基地局とセカンダリ基地局と同時に通信する送受信部と、
前記マスタ基地局のためのRLC(Radio Link Control)レイヤと前記セカンダリ基地局のためのRLCレイヤとを有するRLCレイヤ処理部と、
前記マスタ基地局のためのRLCレイヤと前記セカンダリ基地局のためのRLCレイヤとの間でデータを送受信するPDCP(Packet Data Convergence Protocol)レイヤを有するPDCPレイヤ処理部と、
を有するユーザ装置であって、
前記マスタ基地局と前記セカンダリ基地局とに対して設定されているスプリットベアラにおいてアップリンクデータパケットの送信方向を変更する際、前記RLCレイヤ処理部は、前記マスタ基地局のためのRLCレイヤと前記セカンダリ基地局のためのRLCレイヤとに対して再確立処理を実行し、前記PDCPレイヤ処理部は、前記PDCPレイヤに対して再確立処理を実行するユーザ装置。 - 前記RLCレイヤ処理部と前記PDCPレイヤ処理部とは、前記送信方向の変更前に割り振られたアップリンクデータパケットの送信を停止し、前記送信停止されたアップリンクデータパケットを前記送信方向の変更先の基地局に送信するように、前記RLCレイヤと前記PDCPレイヤとに対して前記再確立処理を実行する、請求項1記載のユーザ装置。
- 前記RLCレイヤ処理部と前記PDCPレイヤ処理部とは、前記送信停止されたアップリンクデータパケットがシーケンス番号の順序通りに送信されるように、前記RLCレイヤと前記PDCPレイヤとに対して前記再確立処理を実行する、請求項2記載のユーザ装置。
- 前記送信方向の変更前の基地局から前記再確立処理の指示を受信すると、前記RLCレイヤ処理部と前記PDCP処理部とは前記再確立処理を実行する、請求項1乃至3何れか一項記載のユーザ装置。
- 前記再確立処理は、アップリンク通信のみに対して実行される、請求項1乃至4何れか一項記載のユーザ装置。
- デュアルコネクティビティによりユーザ装置と通信する送受信部と、
前記ユーザ装置との通信のためのRLC(Radio Link Control)レイヤを有するRLCレイヤ処理部と、
前記ユーザ装置との通信のためのPDCP(Packet Data Convergence Protocol)レイヤを有するPDCPレイヤ処理部と、
を有する基地局であって、
前記PDCPレイヤ処理部は、アップリンクリオーダリングタイマを有し、前記ユーザ装置に対して設定されているスプリットベアラにおいてアップリンクデータパケットの送信方向を変更する際、前記アップリンクリオーダリングタイマを起動し、前記ユーザ装置から受信したアップリンクデータパケットのシーケンス番号が不連続である場合、前記受信したアップリンクデータパケットの上位レイヤへの送信を保留する基地局。 - 前記PDCPレイヤ処理部は、前記アップリンクリオーダリングタイマの満了までに前記ユーザ装置から受信したアップリンクデータパケットのシーケンス番号が不連続なままである場合、前記受信したアップリンクデータパケットを前記上位レイヤに送信する、請求項6記載の基地局。
- 前記PDCPレイヤ処理部は、欠落していたシーケンス番号に対応するアップリンクデータパケットが受信された場合、前記アップリンクリオーダリングタイマを停止し、前記受信したアップリンクデータパケットを前記上位レイヤに送信する、請求項6又は7記載の基地局。
- 前記PDCPレイヤ処理部は、前記アップリンクリオーダリングタイマの満了後又は停止後に受信したアップリンクデータパケットに対して、前記シーケンス番号の欠落を検出すると、前記欠落したシーケンス番号に対応するアップリンクデータパケットが前記ユーザ装置において破棄されたと判断する、請求項6乃至8何れか一項記載の基地局。
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JP2016540275A JP6078699B2 (ja) | 2014-08-06 | 2015-08-05 | ユーザ装置及び基地局 |
US15/116,855 US10306699B2 (en) | 2014-08-06 | 2015-08-05 | User equipment and base station |
EP15830364.4A EP3179770B1 (en) | 2014-08-06 | 2015-08-05 | User equipment |
BR112016016595-0A BR112016016595B1 (pt) | 2014-08-06 | 2015-08-05 | Equipamento de usuário |
CN201580008705.0A CN106031229B (zh) | 2014-08-06 | 2015-08-05 | 用户装置以及基站 |
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JP (1) | JP6078699B2 (ja) |
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- 2015-08-05 CN CN201580008705.0A patent/CN106031229B/zh active Active
- 2015-08-05 WO PCT/JP2015/072282 patent/WO2016021662A1/ja active Application Filing
- 2015-08-05 BR BR112016016595-0A patent/BR112016016595B1/pt active IP Right Grant
- 2015-08-05 US US15/116,855 patent/US10306699B2/en active Active
- 2015-08-05 EP EP15830364.4A patent/EP3179770B1/en active Active
- 2015-08-05 JP JP2016540275A patent/JP6078699B2/ja active Active
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Cited By (6)
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US10405367B2 (en) * | 2016-02-23 | 2019-09-03 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods used in user equipment and associated UES |
WO2017185941A1 (zh) * | 2016-04-29 | 2017-11-02 | 电信科学技术研究院 | 一种数据传输方法及相关设备 |
WO2018116097A1 (en) | 2016-12-19 | 2018-06-28 | Netsia, Inc. | System and method for programmable virtualization and load balancing of split-channel heterogeneous networks utilizing dual connectivity |
WO2018116096A1 (en) | 2016-12-19 | 2018-06-28 | Netsia, Inc. | System and method for programmable virtualization of co-channel heterogeneous networks utilizing dual connectivity |
US10231130B2 (en) | 2016-12-19 | 2019-03-12 | Netsia, Inc. | System and method for programmable virtualization of co-channel heterogeneous networks utilizing dual connectivity |
US10327176B2 (en) | 2016-12-19 | 2019-06-18 | Netsia, Inc. | System and method for programmable virtualization and load balancing of split- channel heterogeneous networks utilizing dual connectivity |
Also Published As
Publication number | Publication date |
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JPWO2016021662A1 (ja) | 2017-04-27 |
JP6078699B2 (ja) | 2017-02-08 |
CN106031229B (zh) | 2019-12-13 |
CN106031229A (zh) | 2016-10-12 |
BR112016016595B1 (pt) | 2023-10-17 |
EP3179770A4 (en) | 2017-11-22 |
US10306699B2 (en) | 2019-05-28 |
EP3179770B1 (en) | 2020-01-01 |
US20170171905A1 (en) | 2017-06-15 |
HUE047983T2 (hu) | 2020-05-28 |
EP3179770A1 (en) | 2017-06-14 |
BR112016016595A2 (ja) | 2017-08-08 |
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