WO2015170655A1 - 通信制御方法、基地局、ユーザ端末 - Google Patents
通信制御方法、基地局、ユーザ端末 Download PDFInfo
- Publication number
- WO2015170655A1 WO2015170655A1 PCT/JP2015/062930 JP2015062930W WO2015170655A1 WO 2015170655 A1 WO2015170655 A1 WO 2015170655A1 JP 2015062930 W JP2015062930 W JP 2015062930W WO 2015170655 A1 WO2015170655 A1 WO 2015170655A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- base station
- user terminal
- secondary base
- radio link
- control method
- Prior art date
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/27—Control channels or signalling for resource management between access points
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
-
- 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
- H04W76/10—Connection setup
- H04W76/18—Management of setup rejection or failure
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/30—Connection release
- H04W76/34—Selective release of ongoing connections
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/16—Interfaces between hierarchically similar devices
- H04W92/20—Interfaces between hierarchically similar devices between access points
-
- 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
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1848—Time-out mechanisms
-
- 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
-
- 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
- H04L1/188—Time-out mechanisms
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/19—Connection re-establishment
Definitions
- the present invention relates to a communication control method, a base station, and a user terminal used in a mobile communication system.
- a dual connection method (Dual connectivity) is scheduled to be introduced after Release 12 (see Non-Patent Document 1).
- the user terminal establishes connections with a plurality of base stations simultaneously. Since the user terminal is assigned radio resources from each base station, the throughput is expected to be improved.
- the double connection method only one base station (hereinafter referred to as “master base station”) among the plurality of base stations that establish a connection with the user terminal establishes an RRC connection with the user terminal.
- master base station a base station among the plurality of base stations that establish a connection with the user terminal
- secondary base stations other base stations among the plurality of base stations provide additional radio resources to the user terminal without establishing an RRC connection with the user terminal.
- the double connection method may be referred to as inter-base station carrier aggregation (inter-eNB CA).
- a communication control method performs a double connection communication using a master base station that establishes an RRC connection with a user terminal and a secondary base station that provides additional radio resources to the user terminal.
- the controlling includes that the user terminal detects a radio link failure between the user terminal and the secondary base station, the user terminal reports the radio link failure to the master base station, and the master terminal The base station transmitting a stop instruction signal to the secondary base station.
- a communication control method controls communication of a double connection method using a master base station that establishes an RRC connection with a user terminal and a secondary base station that provides additional radio resources to the user terminal. Including that.
- the controlling includes that the user terminal detects a radio link failure between the user terminal and the secondary base station, the user terminal reports the radio link failure to the master base station, and the master terminal The base station transmitting a stop instruction signal to the secondary base station.
- the master base station receives the report of the radio link failure and transmits the stop instruction signal to the secondary base station.
- the stop instruction signal is a signal instructing to stop transmission of downlink data to the user terminal.
- the stop instruction signal includes information for identifying the user terminal.
- the secondary base station when the secondary base station receives the stop instruction signal, the secondary base station stops transmission of downlink data to the user terminal.
- the secondary base station when the secondary base station receives the stop instruction signal, the secondary base station starts a timer and holds the downlink data for the user terminal until the time counted by the timer exceeds a predetermined time To do.
- the user terminal restores the radio link, notifies the master base station of restoration of the radio link, and the master base station informs the secondary base station to the radio link. Send a recovery report signal to report the recovery.
- the user terminal restores the radio link and transmits a restoration report signal for reporting the restoration of the radio link to the secondary base station.
- the recovery report signal includes information for identifying the user terminal.
- the secondary base station when the secondary base station receives the recovery report signal, the secondary base station resumes transmission of downlink data for the user terminal.
- the secondary base station when the secondary base station receives the recovery report signal, the secondary base station stops a timer that is started in association with the radio link failure.
- the base station includes: a master base station that establishes an RRC connection with a user terminal; and a secondary base station that provides additional radio resources to the user terminal. It has a control part which performs processing which operates as a station.
- the control unit receives a report of a radio link failure between the user terminal and the secondary base station from the user terminal, and transmits a stop instruction signal to the secondary base station.
- the base station includes the secondary base in a dual connection communication using a master base station that establishes an RRC connection with a user terminal and a secondary base station that provides additional radio resources to the user terminal. It has a control part which performs processing which operates as a station.
- the control unit receives a stop instruction signal from the master base station, receives the instruction signal, and stops transmission of downlink data for the user terminal.
- the user terminal includes the user terminal in a dual connection communication using a master base station that establishes an RRC connection with the user terminal and a secondary base station that provides additional radio resources to the user terminal.
- a control unit that performs processing that operates as The control unit detects a radio link failure between the user terminal and the secondary base station, reports the radio link failure to the master base station, and when the radio link is restored, the master base station Alternatively, the recovery is reported to the secondary base station.
- FIG. 1 is a configuration diagram of an LTE system according to the first embodiment.
- the LTE system includes a UE (User Equipment) 100, an E-UTRAN (Evolved-UMTS Terrestrial Radio Access Network) 10, and an EPC (Evolved Packet Core) 20.
- UE User Equipment
- E-UTRAN Evolved-UMTS Terrestrial Radio Access Network
- EPC Evolved Packet Core
- the UE 100 corresponds to a user terminal.
- the UE 100 is a mobile communication device, and performs radio communication with a cell (serving cell).
- the configuration of the UE 100 will be described later.
- the E-UTRAN 10 corresponds to a radio access network.
- the E-UTRAN 10 includes an eNB 200 (evolved Node-B).
- the eNB 200 corresponds to a base station.
- the eNB 200 is connected to each other via the X2 interface. The configuration of the eNB 200 will be described later.
- the eNB 200 manages one or a plurality of cells and performs radio communication with the UE 100 that has established a connection with the own cell.
- the eNB 200 has a radio resource management (RRM) function, a user data routing function, a measurement control function for mobility control / scheduling, and the like.
- RRM radio resource management
- Cell is used as a term indicating a minimum unit of a radio communication area, and is also used as a term indicating a function of performing radio communication with the UE 100.
- the EPC 20 corresponds to a core network.
- the EPC 20 includes an MME (Mobility Management Entity) / S-GW (Serving-Gateway) 300.
- the MME performs various mobility controls for the UE 100.
- the SGW performs user data transfer control.
- the MME / S-GW 300 is connected to the eNB 200 via the S1 interface.
- FIG. 2 is a block diagram of the UE 100.
- the UE 100 includes a plurality of antennas 101, a radio transceiver 110, a user interface 120, a GNSS (Global Navigation Satellite System) receiver 130, a battery 140, a memory 150, and a processor 160.
- the memory 150 and the processor 160 constitute a control unit.
- the UE 100 may not have the GNSS receiver 130.
- the memory 150 may be integrated with the processor 160, and this set (that is, a chip set) may be used as the processor 160 '.
- the antenna 101 and the wireless transceiver 110 are used for transmitting and receiving wireless signals.
- the radio transceiver 110 converts the baseband signal (transmission signal) output from the processor 160 into a radio signal and transmits it from the antenna 101. Further, the radio transceiver 110 converts a radio signal received by the antenna 101 into a baseband signal (received signal) and outputs the baseband signal to the processor 160.
- the user interface 120 is an interface with a user who owns the UE 100, and includes, for example, a display, a microphone, a speaker, and various buttons.
- the user interface 120 receives an operation from the user and outputs a signal indicating the content of the operation to the processor 160.
- the GNSS receiver 130 receives a GNSS signal and outputs the received signal to the processor 160 in order to obtain location information indicating the geographical location of the UE 100.
- the battery 140 stores power to be supplied to each block of the UE 100.
- the memory 150 stores a program executed by the processor 160 and information used for processing by the processor 160.
- the processor 160 includes a baseband processor that modulates / demodulates and encodes / decodes a baseband signal, and a CPU (Central Processing Unit) that executes programs stored in the memory 150 and performs various processes. .
- the processor 160 may further include a codec that performs encoding / decoding of an audio / video signal.
- the processor 160 executes various processes and various communication protocols described later.
- FIG. 3 is a block diagram of the eNB 200.
- the eNB 200 includes a plurality of antennas 201, a radio transceiver 210, a network interface 220, a memory 230, and a processor 240.
- the memory 230 and the processor 240 constitute a control unit. Further, the memory 230 may be integrated with the processor 240, and this set (that is, a chip set) may be used as the processor.
- the antenna 201 and the wireless transceiver 210 are used for transmitting and receiving wireless signals.
- the radio transceiver 210 converts the baseband signal (transmission signal) output from the processor 240 into a radio signal and transmits it from the antenna 201.
- the radio transceiver 210 converts a radio signal received by the antenna 201 into a baseband signal (received signal) and outputs the baseband signal to the processor 240.
- the network interface 220 is connected to the neighboring eNB 200 via the X2 interface and is connected to the MME / S-GW 300 via the S1 interface.
- the network interface 220 is used for communication performed on the X2 interface and communication performed on the S1 interface.
- the memory 230 stores a program executed by the processor 240 and information used for processing by the processor 240.
- the processor 240 includes a baseband processor that performs modulation / demodulation and encoding / decoding of a baseband signal, and a CPU that executes a program stored in the memory 230 and performs various processes.
- the processor 240 executes various processes and various communication protocols described later.
- FIG. 4 is a protocol stack diagram of a radio interface in the LTE system. As shown in FIG. 4, the radio interface protocol is divided into the first to third layers of the OSI reference model, and the first layer is a physical (PHY) layer.
- the second layer includes a MAC (Medium Access Control) layer, an RLC (Radio Link Control) layer, and a PDCP (Packet Data Convergence Protocol) layer.
- the third layer includes an RRC (Radio Resource Control) layer.
- the physical layer performs encoding / decoding, modulation / demodulation, antenna mapping / demapping, and resource mapping / demapping. Between the physical layer of UE100 and the physical layer of eNB200, user data and a control signal are transmitted via a physical channel.
- the MAC layer performs priority control of data, retransmission processing by hybrid ARQ (HARQ), random access procedure at the time of establishing RRC connection, and the like.
- HARQ hybrid ARQ
- the MAC layer of the eNB 200 includes a scheduler that determines an uplink / downlink transport format (transport block size, modulation / coding scheme) and an allocation resource block to the UE 100.
- the RLC layer transmits data to the RLC layer on the receiving side using the functions of the MAC layer and the physical layer. Between the RLC layer of the UE 100 and the RLC layer of the eNB 200, user data and control signals are transmitted via a logical channel.
- the PDCP layer performs header compression / decompression and encryption / decryption.
- the RRC layer is defined only in the control plane that handles control signals. Control signals (RRC messages) for various settings are transmitted between the RRC layer of the UE 100 and the RRC layer of the eNB 200.
- the RRC layer controls the logical channel, the transport channel, and the physical channel according to establishment, re-establishment, and release of the radio bearer.
- RRC connection When there is a connection (RRC connection) between the RRC of the UE 100 and the RRC of the eNB 200, the UE 100 is in the RRC connected state, and otherwise, the UE 100 is in the RRC idle state.
- the NAS (Non-Access Stratum) layer located above the RRC layer performs session management and mobility management.
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Multiple Access
- the radio frame is composed of 10 subframes arranged in the time direction.
- Each subframe is composed of two slots arranged in the time direction.
- the length of each subframe is 1 ms, and the length of each slot is 0.5 ms.
- Each subframe includes a plurality of resource blocks (RB) in the frequency direction and includes a plurality of symbols in the time direction.
- Each resource block includes a plurality of subcarriers in the frequency direction.
- radio resources (time / frequency resources) allocated to the UE 100 frequency resources can be specified by resource blocks, and time resources can be specified by subframes (or slots).
- the section of the first few symbols of each subframe is an area mainly used as a physical downlink control channel (PDCCH) for transmitting a control signal.
- the remaining section of each subframe is an area that can be used as a physical downlink shared channel (PDSCH) mainly for transmitting user data.
- PDSCH physical downlink shared channel
- both ends in the frequency direction in each subframe are regions used mainly as a physical uplink control channel (PUCCH) for transmitting a control signal.
- the other part in each subframe is an area that can be used mainly as a physical uplink shared channel (PUSCH) for transmitting user data.
- PUCCH physical uplink control channel
- PUSCH physical uplink shared channel
- the LTE system supports a double connection method.
- the dual connection method is scheduled to be introduced after Release 12.
- the UE 100 establishes connections with a plurality of eNBs 200 at the same time. Since radio resources are allocated from each eNB 200 to the UE 100, an improvement in throughput is expected.
- the double connection method may be referred to as inter-eNB 200 carrier aggregation (inter-eNB CA).
- FIG. 5 is a diagram for explaining the outline of the double connection method.
- the master eNB (MeNB) 200-1 among the plurality of eNBs 200 that establish a connection with the UE 100 establishes an RRC connection with the UE 100.
- the secondary eNB (SeNB) 200-2 among the plurality of eNBs 200 provides the UE 100 with additional radio resources without establishing an RRC connection with the UE 100.
- the MeNB 200-1 establishes not only a user plane connection but also a control plane connection with the UE 100.
- the SeNB 200-2 establishes a user plane connection with the UE 100 without establishing a control plane connection with the UE 100.
- An Xn interface is set between the MeNB 200-1 and the SeNB 200-2.
- the Xn interface is an X2 interface or a new interface.
- FIGS. 6 and 7 are diagrams for explaining a configuration method of a user data transfer path (data path) in the dual connection method.
- data path There are mainly two types of user plane architectures (UP architectures) that constitute user data transfer paths (data paths) in the dual connection method.
- UP architectures user plane architectures
- FIG. 6 shows the first UP architecture.
- the EPS bearer # 1 between the UE 100 and the P-GW passes through the S1-U interface between the MeNB 200-1 and the S-GW 300U.
- the EPS bearer # 2 between the UE 100 and the P-GW passes through the S1-U interface between the SeNB 200-2 and the S-GW 300U.
- the data path between the SeNB 200-2 and the S-GW 300U does not pass through the MeNB 200-1.
- each of the MeNB 200-1 and the SeNB 200-2 performs processing of each layer of PDCP, RLC, and MAC.
- FIG. 7 shows a second UP architecture.
- the EPS bearer # 2 between the UE 100 and the P-GW is divided in the MeNB 200-1, and one of the divided bearers (split bearer) is Terminate at UE 100 via SeNB 200-2, and the other split (split bearer) terminates at UE 100 without going through SeNB 200-2.
- the data path between the SeNB 200-2 and the S-GW 300U passes through the MeNB 200-1.
- processing of each layer is performed by the PDCP of the MeNB 200-1 and the RLC and MAC of the SeNB 200-2.
- the MeNB may be in charge of processing up to RLC (or a partial function of RLC).
- UE 100 detects a radio link failure (S-RLF) with a cell under SeNB 200-2 by using L1-out-of-sync (T310 expire), RACH failure, and RLC failure.
- S-RLF radio link failure
- T310 expire L1-out-of-sync
- RACH failure RACH failure
- RLC failure RLC failure
- the UE 100 reports the occurrence of the S-RLF to the MeNB 200-1. This report includes the trigger that detected the S-RLF.
- the UE 100 stops uplink data transmission for the SeNB 200-2. Further, the UE 100 stops monitoring the PDCCH of the cell of the SeNB 200-2 in which the S-RLF has occurred. On the other hand, the UE 100 continues uplink data transmission for the MeNB 200-1.
- the S-GW transmits downlink data to the SeNB 200-2, and the SeNB 200-2 is used for downlink data transmission. Allocate other resources.
- the MeNB 200-1 recognizes the occurrence of S-RLF, it is already transferred from the MeNB 200-1 to the SeNB 200-2, and the SeNB 200-2 Exists in the downlink data.
- the SeNB 200-2 allocates resources for downlink data transmission for these downlink data.
- the MeNB 200-1 transmits a stop instruction signal for temporarily allocating resources for downlink data transmission and temporarily stopping downlink data transmission to the SeNB 200-2.
- This stop instruction signal may be an indication indicating that resource allocation for downlink data transmission and transmission of downlink data are temporarily stopped.
- the stop instruction signal is transmitted when the MeNB 200-1 receives an S-RLF generation notification from the UE 100 as a trigger.
- the stop instruction signal includes information that can identify the UE 100 so that the SeNB 200-2 can identify the UE 100 in which the S-RLF has occurred.
- the identifiable information of the UE 100 is information that allows the SeNB 200-2 such as IMSI, TMSI, and RNTI to uniquely identify the UE 100.
- the SeNB 200-2 When receiving the stop instruction signal, the SeNB 200-2 stops resource allocation and transmission to downlink data addressed to the UE 100 accumulated in the SeNB 200-2.
- the SeNB 200-2 holds the accumulated downlink data for the UE 100 and the downlink data for the UE 100 that is newly transferred.
- the SeNB 200-2 may start a timer when receiving a stop instruction signal from the MeNB 200-1, and discard the held data when the timer value exceeds a predetermined threshold value. .
- the SeNB 200-2 may stop the timer when the data is discarded.
- S-RLF (Operation when the wireless link is restored)
- the UE 100 attempts to repair the radio link between the UE 100 and the SeNB 200-2.
- the UE 100 repairs the radio link (S-RLF repair)
- the UE 100 reports the SRLF repair to the MeNB 200-1.
- the MeNB 200-1 When the MeNB 200-1 receives the S-RLF repair report from the UE 100, the MeNB 200-1 transmits a recovery report signal, which is a signal for resuming downlink resource allocation and downlink data transmission for the UE 100, to the SeNB 200-2. .
- This recovery report signal may be an indication indicating that the downlink resource allocation and downlink data transmission are resumed.
- the resumption signal includes information capable of identifying the UE 100 so that the UE 100 that is the target of resumption of downlink resource allocation and downlink data transmission can be identified.
- the information that can identify the UE 100 is information that allows the SeNB 200-2 such as IMSI, TMSI, and RNTI to uniquely identify the UE 100.
- the SeNB 200-2 When receiving the restart signal, the SeNB 200-2 restarts allocation of downlink resources and transmission of downlink data for the UE 100.
- the timer when the timer is started when the stop instruction signal is received from the MeNB 200-1, the timer may be stopped.
- the UE 100 has established a connection with both the MeNB 200-1 and the SeNB 200-2 (S100: Dual Connection).
- UE 100 detects a radio link failure between UE 100 and a cell (SCG) under SeNB 200-2 (S101: Radio link problem for SCG).
- UE 100 reports a radio link failure with a cell (SCG) under SeNB 200-2 to MeNB 200-1 (S102: S-RLF report).
- the MeNB 200-1 When the MeNB 200-1 receives the S-RLF report from the UE 100, the MeNB 200-1 transmits a stop instruction signal instructing the SeNB 200-2 to allocate downlink resources for the UE 100 and stop transmission of downlink data (S103: Transmission deactivation the inclusion UE -ID).
- the stop instruction signal includes an identifier of UE 100, which is information that can uniquely identify UE 100.
- the UE 100 stops transmission of uplink data for the cell (SCG) under the control of the SeNB 200-2 (S104: Stop UL transmission directions SCG). Further, the UE 100 stops monitoring the physical control channel of the cell (SCG) under the control of the SeNB 200-2 (S105: Stop monitoring PDCCH for SCG).
- the SeNB 200-2 When the SeNB 200-2 receives the stop instruction signal, the SeNB 200-2 stops downlink resource allocation and downlink data transmission for the UE 100 (S106: Stop resource allocations the UE).
- the SeNB 200-2 may start a timer.
- the SeNB 200-2 may operate to hold downlink data for the UE 100 until the timer value exceeds a predetermined threshold, and to discard the downlink data for the UE 100 when the threshold value is exceeded.
- the UE 100 recovers the radio link between the UE 100 and the SeNB 200-2 (S107: Radio link for for SCG recovered), and reports the recovery of the radio link to the MeNB 200-1 (S108: S-RLF recover indication).
- the MeNB 200-1 Upon receiving the radio link recovery report, the MeNB 200-1 transmits a recovery report signal, which is a signal for resuming downlink data transmission and downlink resource allocation for the UE 100, to the SeNB 200-2 (S109: Transmission activation). including the UE-ID).
- S109 includes an identifier of the UE 100, which is information that can uniquely identify the UE 100.
- the SeNB 200-2 When the SeNB 200-2 receives the recovery report signal, the SeNB 200-2 resumes downlink data transmission and downlink resource allocation (S110: Re-start resource allocation the the UE).
- the recovery report signal includes an identifier of the UE 100, which is information that can uniquely identify the UE 100.
- the SeNB 200-2 may stop the timer.
- SeNB 200-2 resumes downlink data transmission using PDSCH, and UE 100 resumes PDCCH monitoring (S111: PDCCH / PDSCH).
- the SeNB 200-2 that has received the radio link recovery report resumes transmission of downlink data and allocation of downlink resources for the UE 100.
- the UE 100 reports the recovery of the radio link directly to the SeNB 200-2 (S208: S-RLF recover indication).
- the SeNB 200-2 resumes downlink data transmission and downlink resource allocation for the UE 100 (S209: Re-start resource allocation the the UE).
- the LTE system has been described as an example of the mobile communication system.
- the present invention is not limited to the LTE system, and the present invention may be applied to a system other than the LTE system.
- the present invention is useful in the communication field.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
実施形態に係る通信制御方法は、RRC接続をユーザ端末と確立するマスタ基地局と、追加的な無線リソースを前記ユーザ端末に提供するセカンダリ基地局と、を用いる二重接続方式の通信を制御することを含む。前記制御することは、前記ユーザ端末が、該ユーザ端末と前記セカンダリ基地局との間の無線リンク障害を検出し、前記ユーザ端末が、前記マスタ基地局に前記無線リンク障害を報告し、前記マスタ基地局が、前記セカンダリ基地局に停止指示信号を送信する、ことを含む。
以下において、本発明をLTEシステムに適用する場合の実施形態を説明する。
図1は、第1実施形態に係るLTEシステムの構成図である。
第1実施形態に係るLTEシステムは、二重接続方式をサポートする。二重接続方式は、リリース12以降において導入が予定されている。二重接続方式では、UE100は、複数のeNB200との接続を同時に確立する。UE100には、各eNB200から無線リソースが割り当てられるため、スループットの向上が見込まれる。なお、二重接続方式は、eNB200間キャリアアグリゲーション(inter-eNB CA)と称されることもある。
次に、SeNB200-2とUE100間の無線リンク障害時の動作について説明する。
S-RLFが発生すると、UE100は、UE100とSeNB200-2の無線リンクの修復を試みる。UE100は無線リンクの修復を行うと(S-RLFの修復)、SRLFの修復をMeNB200-1に報告する。
図8を用いて、S-RLFの無線リンク障害検出から復旧までのフローを説明する。
以下において、第2実施形態について説明する。第1実施形態と共通する部分については説明を省略し、差異点についてのみ説明する。
本実施形態では、UE100が、UE100とSeNB200-2の無線リンクを復旧した際に、MeNB200-1にではなく、SeNB200-2に直接、無線リンクの復旧を報告する。
図9を用いて、本実施形態に係るシーケンスを説明する。
上述した実施形態では、移動通信システムの一例としてLTEシステムを説明したが、LTEシステムに限定されるものではなく、LTEシステム以外のシステムに本発明を適用してもよい。
Claims (13)
- RRC接続をユーザ端末と確立するマスタ基地局と、追加的な無線リソースを前記ユーザ端末に提供するセカンダリ基地局と、を用いる二重接続方式の通信を制御することを含み、前記制御することは、
前記ユーザ端末が、該ユーザ端末と前記セカンダリ基地局との間の無線リンク障害を検出し、
前記ユーザ端末が、前記マスタ基地局に前記無線リンク障害を報告し、
前記マスタ基地局が、前記セカンダリ基地局に停止指示信号を送信する、
ことを含む通信制御方法。 - 前記マスタ基地局は、前記無線リンク障害の報告を受けて、前記セカンダリ基地局に前記停止指示信号を送信し、
前記停止指示信号は、前記ユーザ端末への下りデータの送信停止を指示する信号である、
請求項1に記載の通信制御方法。 - 前記停止指示信号は、前記ユーザ端末を識別する情報を含む、
請求項1に記載の通信制御方法。 - 前記セカンダリ基地局は、前記停止指示信号を受信した場合、前記ユーザ端末への下りデータの送信を停止する、
請求項3に記載の通信制御方法。 - 前記セカンダリ基地局は、
前記停止指示信号を受信した際に、タイマを起動し、
前記タイマの計時時間が所定時間を超えるまで、前記ユーザ端末向け下りデータを保持する、
請求項4に記載の通信制御方法。 - 前記ユーザ端末は、
前記無線リンクを復旧し、
前記無線リンクの復旧を前記マスタ基地局に通知し、
前記マスタ基地局は、前記セカンダリ基地局に、前記無線リンクの復旧を報告する復旧報告信号を送信する、
請求項1に記載の通信制御方法。 - 前記ユーザ端末は、
前記無線リンクを復旧し、
前記セカンダリ基地局に、前記無線リンクの復旧を報告する復旧報告信号を送信する、
請求項1に記載の通信制御方法。 - 前記復旧報告信号は、前記ユーザ端末を識別する情報を含む、
請求項6に記載の通信制御方法。 - 前記セカンダリ基地局は、前記復旧報告信号を受信すると、前記ユーザ端末向けの下りデータの送信の再開を行う、
請求項6に記載の通信制御方法。 - 前記セカンダリ基地局は、前記復旧報告信号を受信すると、前記無線リンク障害に伴って起動したタイマを停止する、
請求項6に記載の通信制御方法。 - RRC接続をユーザ端末と確立するマスタ基地局と、追加的な無線リソースを前記ユーザ端末に提供するセカンダリ基地局と、を用いる二重接続方式の通信において前記マスタ基地局として動作する処理を行う制御部を有し、
前記制御部は、
前記ユーザ端末から、前記ユーザ端末と前記セカンダリ基地局との間の無線リンク障害の報告を受信し、
前記セカンダリ基地局に停止指示信号を送信する、
基地局。 - RRC接続をユーザ端末と確立するマスタ基地局と、追加的な無線リソースを前記ユーザ端末に提供するセカンダリ基地局と、を用いる二重接続方式の通信において前記セカンダリ基地局として動作する処理を行う制御部を有し、
前記制御部は、
前記マスタ基地局から停止指示信号を受信し、
前記指示信号を受けて、前記ユーザ端末向け下りデータの送信を停止する、
基地局。 - RRC接続をユーザ端末と確立するマスタ基地局と、追加的な無線リソースを前記ユーザ端末に提供するセカンダリ基地局と、を用いる二重接続方式の通信において前記ユーザ端末として動作する処理を行う制御部を有し、
前記制御部は、
前記ユーザ端末と前記セカンダリ基地局との間の無線リンク障害を検出し、
前記無線リンク障害を前記マスタ基地局に報告し、
前記無線リンクが復旧した際に、前記マスタ基地局又は前記セカンダリ基地局に前記復旧について報告する、
ユーザ端末。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15789386.8A EP3142452A4 (en) | 2014-05-07 | 2015-04-30 | Communication control method, base station, and user terminal |
JP2016517885A JP6542203B2 (ja) | 2014-05-07 | 2015-04-30 | 通信制御方法、基地局、ユーザ端末 |
US15/308,718 US10123318B2 (en) | 2014-05-07 | 2015-04-30 | Communication control method, base station, and user terminal |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014095880 | 2014-05-07 | ||
JP2014-095880 | 2014-05-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015170655A1 true WO2015170655A1 (ja) | 2015-11-12 |
Family
ID=54392507
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2015/062930 WO2015170655A1 (ja) | 2014-05-07 | 2015-04-30 | 通信制御方法、基地局、ユーザ端末 |
Country Status (4)
Country | Link |
---|---|
US (1) | US10123318B2 (ja) |
EP (1) | EP3142452A4 (ja) |
JP (1) | JP6542203B2 (ja) |
WO (1) | WO2015170655A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109565810A (zh) * | 2016-08-05 | 2019-04-02 | 三菱电机株式会社 | 通信*** |
CN110547037A (zh) * | 2017-04-28 | 2019-12-06 | 富士通株式会社 | 无线终端、基站、无线通信***以及无线通信方法 |
JP2022517605A (ja) * | 2019-01-18 | 2022-03-09 | 維沃移動通信有限公司 | 情報指示方法、情報取得方法、端末及びネットワークノード |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4181440A1 (en) * | 2014-01-31 | 2023-05-17 | Nokia Solutions and Networks Oy | Backhaul errors in dual connectivity |
CN108307524B (zh) * | 2016-09-19 | 2021-11-19 | 华为技术有限公司 | 链路建立方法及设备与无线通信*** |
CN109246839B (zh) * | 2017-05-05 | 2023-11-28 | 华为技术有限公司 | 一种失败处理方法、切换方法及终端设备、网络设备 |
EP3439188B1 (en) * | 2017-08-03 | 2019-12-11 | Kapsch CarrierCom France S.A.S. | Method and system for redundant communication between a user terminal and a central station |
WO2019032002A1 (en) * | 2017-08-10 | 2019-02-14 | Telefonaktiebolaget Lm Ericsson (Publ) | METHODS OF RESPONSE TO SCG FAILURE IN WIRELESS DC AND TERMINAL COMMUNICATIONS AND ASSOCIATED TERMINALS AND NETWORK NODES |
KR20200035904A (ko) | 2018-09-27 | 2020-04-06 | 삼성전자주식회사 | 무선 통신 시스템에서 이중 접속을 수행하는 방법 및 장치. |
US11350477B2 (en) * | 2019-03-29 | 2022-05-31 | Qualcomm Incorporated | Control signaling after primary cell link failure |
JP7426383B2 (ja) * | 2019-04-26 | 2024-02-01 | 京セラ株式会社 | 通信制御方法 |
KR20210015091A (ko) | 2019-07-31 | 2021-02-10 | 삼성전자주식회사 | 듀얼 커넥티비티를 지원하는 전자 장치 및 그 동작 방법 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104581843B (zh) * | 2013-10-21 | 2018-07-03 | 宏达国际电子股份有限公司 | 用于无线通信***的网络端的处理交递方法及其通信装置 |
US20150133122A1 (en) * | 2013-11-08 | 2015-05-14 | Industrial Technology Research Institute | Method of Handling Radio Link Failure |
US9661657B2 (en) * | 2013-11-27 | 2017-05-23 | Intel Corporation | TCP traffic adaptation in wireless systems |
-
2015
- 2015-04-30 JP JP2016517885A patent/JP6542203B2/ja active Active
- 2015-04-30 US US15/308,718 patent/US10123318B2/en active Active
- 2015-04-30 EP EP15789386.8A patent/EP3142452A4/en not_active Withdrawn
- 2015-04-30 WO PCT/JP2015/062930 patent/WO2015170655A1/ja active Application Filing
Non-Patent Citations (4)
Title |
---|
CATT ET AL.: "RLM considerations on the special cell of SCG", 3GPP TSG RAN WG2 MEETING #85 R2- 140180, 29 January 2014 (2014-01-29), XP050737410, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/ tsg_ran/WG2_RL2/TSGR2_85/Docs/R2-140180.zip> * |
QUALCOMM INCORPORATED: "On RLF and RLM requirements for the special SCell", 3GPP TSG- RAN WG2 MEETING #85BIS R2-141672, 22 March 2014 (2014-03-22), XP050792806, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/WG2_RL2/TSGR2_ 85bis/Docs/R2-141672.zip> * |
QUALCOMM INCORPORATED: "On the RLM requirement for the SeNB", 3GPP TSG-RAN WG2 MEETING #85 R2- 140500, 31 January 2014 (2014-01-31), XP050737675, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/ tsg_ran/WG2_RL2/TSGR2_85/Docs/R2-140500.zip> * |
See also references of EP3142452A4 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109565810A (zh) * | 2016-08-05 | 2019-04-02 | 三菱电机株式会社 | 通信*** |
CN110547037A (zh) * | 2017-04-28 | 2019-12-06 | 富士通株式会社 | 无线终端、基站、无线通信***以及无线通信方法 |
CN110547037B (zh) * | 2017-04-28 | 2023-06-16 | 富士通株式会社 | 无线终端、基站、无线通信***以及无线通信方法 |
JP2022517605A (ja) * | 2019-01-18 | 2022-03-09 | 維沃移動通信有限公司 | 情報指示方法、情報取得方法、端末及びネットワークノード |
JP7213993B2 (ja) | 2019-01-18 | 2023-01-27 | 維沃移動通信有限公司 | 情報指示方法、情報取得方法、端末及びネットワークノード |
US11937321B2 (en) | 2019-01-18 | 2024-03-19 | Vivo Mobile Communication Co., Ltd. | Information indication method, information obtaining method, terminal, and network node |
Also Published As
Publication number | Publication date |
---|---|
EP3142452A1 (en) | 2017-03-15 |
US10123318B2 (en) | 2018-11-06 |
EP3142452A4 (en) | 2017-12-20 |
JP6542203B2 (ja) | 2019-07-10 |
JPWO2015170655A1 (ja) | 2017-04-20 |
US20170195996A1 (en) | 2017-07-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6542203B2 (ja) | 通信制御方法、基地局、ユーザ端末 | |
US10039086B2 (en) | Communication method and apparatus in network environment where terminal may have dual connectivity to multiple base stations | |
WO2016121670A1 (ja) | ユーザ端末及び基地局 | |
US20180027456A1 (en) | Base station | |
US10327273B2 (en) | Receiving terminal and transmitting terminal | |
JP6132840B2 (ja) | 通信制御方法、ユーザ端末、プロセッサ、及び記憶媒体 | |
JP6499166B2 (ja) | 通信制御方法、ユーザ端末及び基地局 | |
JP6567192B2 (ja) | 基地局及びモビリティ管理エンティティ | |
JP5905575B2 (ja) | 通信制御方法及び基地局 | |
JP7522797B2 (ja) | 通信制御方法 | |
WO2016167211A1 (ja) | 通信装置 | |
JP6479823B2 (ja) | 基地局、プロセッサ及びネットワーク装置 | |
JP6157980B2 (ja) | 基地局及び通信制御方法 | |
WO2015170768A1 (ja) | 通信制御方法、基地局、及びユーザ端末 | |
WO2015170723A1 (ja) | ユーザ端末 | |
WO2015020033A1 (ja) | 基地局 | |
US20160157079A1 (en) | User terminal, network apparatus, and processor | |
JP6106286B2 (ja) | ユーザ端末及びプロセッサ | |
JP7426383B2 (ja) | 通信制御方法 | |
WO2015141726A1 (ja) | 通信制御方法、基地局及びユーザ端末 | |
JP6670294B2 (ja) | ネットワーク装置及び基地局 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 15789386 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 15308718 Country of ref document: US |
|
ENP | Entry into the national phase |
Ref document number: 2016517885 Country of ref document: JP Kind code of ref document: A |
|
REEP | Request for entry into the european phase |
Ref document number: 2015789386 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2015789386 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |