WO2014157396A1 - 通信制御方法、ユーザ端末、及びプロセッサ - Google Patents
通信制御方法、ユーザ端末、及びプロセッサ Download PDFInfo
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- WO2014157396A1 WO2014157396A1 PCT/JP2014/058652 JP2014058652W WO2014157396A1 WO 2014157396 A1 WO2014157396 A1 WO 2014157396A1 JP 2014058652 W JP2014058652 W JP 2014058652W WO 2014157396 A1 WO2014157396 A1 WO 2014157396A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/16—Arrangements for providing special services to substations
- H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
- H04L12/189—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0007—Control or signalling for completing the hand-off for multicast or broadcast services, e.g. MBMS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/18—Selecting a network or a communication service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a communication control method, a user terminal, and a processor for receiving an MBMS service.
- 3GPP 3rd Generation Partnership Project
- MBMS Multimedia Broadcast Multicast Service
- Each PLMN may be a network with a different operator (communication carrier) or a network with a different radio access technology (RAT).
- RAT radio access technology
- the present invention provides a communication control method, a user terminal, and a processor that enable reception of an MBMS service distributed from a PLMN different from a selected PLMN.
- the communication control method is a method for receiving an MBMS service.
- the communication control method when a user terminal connected in the first cell belonging to the first PLMN determines that an MBMS service of interest to the user terminal is distributed by the second PLMN, the communication control method Step A for transmitting information for transition to the idle state to the first cell, and the user terminal that has transitioned from the connected state to the idle state reselects the second cell belonging to the second PLMN And receiving the MBMS service from the second cell.
- FIG. 1 is a configuration diagram of an LTE system according to the embodiment.
- FIG. 2 is a block diagram of the UE according to the embodiment.
- FIG. 3 is a block diagram of the eNB according to the embodiment.
- FIG. 4 is a protocol stack diagram of a radio interface in the LTE system.
- FIG. 5 is a configuration diagram of a radio frame used in the LTE system.
- FIG. 6 is a diagram illustrating an operating environment according to the embodiment.
- FIG. 7 is an operation sequence diagram according to the embodiment.
- the communication control method is a method for receiving an MBMS service.
- the communication control method when a user terminal connected in the first cell belonging to the first PLMN determines that an MBMS service of interest to the user terminal is distributed by the second PLMN, the communication control method Step A for transmitting information for transition to the idle state to the first cell, and the user terminal that has transitioned from the connected state to the idle state reselects the second cell belonging to the second PLMN And receiving the MBMS service from the second cell.
- the step A includes the step A1 in which the user terminal receives MBMS basic information related to the MBMS service distributed by the second PLMN from the first PLMN, and the user terminal has the MBMS basic information. Based on the information, step A2 of receiving MBMS detailed information on the MBMS service distributed by the second PLMN from the second PLMN, and the user terminal of the user's own interest based on the MBMS detailed information Determining that an MBMS service is delivered by the second PLMN.
- step A the user terminal transmits an RRC connection release request to the first cell as information for transitioning from the connected state to the idle state.
- the user terminal transmits an MBMS interest notification including frequency information and priority information to the first cell as information for transitioning from the connected state to the idle state.
- the frequency information indicates that there is no frequency for delivering the MBMS service that the user terminal is receiving or interested in.
- the priority information indicates that the reception of the MBMS service is given priority over the reception of the unicast service.
- the user terminal supports MBMS.
- the connected state The control part which transmits the information for changing to an idle state from said 1st cell is provided. After the transition from the connected state to the idle state, the control unit reselects a second cell belonging to the second PLMN and receives the MBMS service from the second cell.
- the processor according to the embodiment is provided in a user terminal that supports MBMS. If the processor is connected in the first cell belonging to the first PLMN and determines that the MBMS service of its interest is delivered by the second PLMN, the processor Process A for transmitting information for transition to the idle state to the first cell, and after transitioning from the connected state to the idle state, reselecting the second cell belonging to the second PLMN, And process B for receiving the MBMS service from the second cell.
- FIG. 1 is a configuration diagram of an LTE system according to the first embodiment.
- the LTE system includes a plurality of UEs (User Equipment) 100, an E-UTRAN (Evolved-UMTS Terrestrial Radio Access Network) 10, and an EPC (Evolved Packet Core) 20.
- the E-UTRAN 10 corresponds to a radio access network
- the EPC 20 corresponds to a core network.
- the E-UTRAN 10 and the EPC 20 constitute an LTE system network.
- the UE 100 is a mobile communication device, and performs wireless communication with a connection destination cell (serving cell).
- UE100 is corresponded to a user terminal.
- the E-UTRAN 10 includes a plurality of eNBs 200 (evolved Node-B).
- the eNB 200 corresponds to a base station.
- 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.
- “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 eNB 200 has, for example, a radio resource management (RRM) function, a user data routing function, and a measurement control function for mobility control and scheduling.
- RRM radio resource management
- the EPC 20 includes a plurality of MME (Mobility Management Entity) / S-GW (Serving-Gateway) 300.
- MME Mobility Management Entity
- S-GW Serving-Gateway
- the MME is a network node that performs various types of mobility control for the UE 100, and corresponds to a control station.
- the S-GW is a network node that performs transfer control of user data, and corresponds to an exchange.
- the EPC 20 configured by the MME / S-GW 300 accommodates the eNB 200.
- the eNB 200 is connected to each other via the X2 interface.
- the eNB 200 is connected to the MME / S-GW 300 via the S1 interface.
- FIG. 2 is a block diagram of the UE 100.
- the UE 100 includes an antenna 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 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 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 an antenna 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.
- the antenna 201 and the wireless transceiver 210 are used for transmitting and receiving wireless signals.
- the wireless transceiver 210 converts the baseband signal output from the processor 240 into a wireless 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 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 layers 1 to 3 of the OSI reference model, and layer 1 is a physical (PHY) layer. Layer 2 includes a MAC (Media Access Control) layer, an RLC (Radio Link Control) layer, and a PDCP (Packet Data Convergence Protocol) layer. Layer 3 includes an RRC (Radio Resource Control) layer.
- PHY Physical
- Layer 2 includes a MAC (Media Access Control) layer, an RLC (Radio Link Control) layer, and a PDCP (Packet Data Convergence Protocol) layer.
- Layer 3 includes an RRC (Radio Resource Control) layer.
- RRC Radio Resource Control
- the physical layer performs encoding / decoding, modulation / demodulation, antenna mapping / demapping, and resource mapping / demapping. Data is transmitted between the physical layer of the UE 100 and the physical layer of the eNB 200 via a physical channel.
- the MAC layer performs data priority control, retransmission processing by hybrid ARQ (HARQ), and the like. Data is transmitted via the transport channel between the MAC layer of the UE 100 and the MAC layer of the eNB 200.
- the MAC layer of the eNB 200 includes a scheduler that determines uplink / downlink transport formats (transport block size, modulation / coding scheme (MCS)) and allocated resource blocks.
- MCS modulation / coding scheme
- the RLC layer transmits data to the RLC layer on the receiving side using the functions of the MAC layer and the physical layer. Data is transmitted between the RLC layer of the UE 100 and the RLC layer of the eNB 200 via a logical channel.
- the PDCP layer performs header compression / decompression and encryption / decryption.
- the RRC layer is defined only in the control plane. Control messages (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 connected state When there is an RRC connection between the RRC of the UE 100 and the RRC of the eNB 200, the UE 100 is in a connected state (RRC connected state). Otherwise, the UE 100 is in an idle state (RRC idle state).
- the NAS (Non-Access Stratum) layer located above the RRC layer performs session management and mobility management.
- FIG. 5 is a configuration diagram of a radio frame used in the LTE system.
- OFDMA Orthogonal Frequency Division Multiplexing Access
- SC-FDMA Single Carrier Frequency Multiple Access
- the radio frame is composed of 10 subframes arranged in the time direction, and 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.
- the resource block includes a plurality of subcarriers in the frequency direction.
- a frequency resource can be specified by a resource block
- a time resource can be specified by a subframe (or slot).
- the section of the first few symbols of each subframe is a control region used mainly 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 control regions mainly used as a physical uplink control channel (PUCCH) for transmitting a control signal.
- the central portion in the frequency direction in each subframe is an area that can be used as a physical uplink shared channel (PUSCH) mainly for transmitting user data.
- PUSCH physical uplink shared channel
- MBMS MBMS is a bearer service that realizes multicast distribution.
- the network can improve the network efficiency and the frequency utilization efficiency by simultaneously delivering the MBMS service to a plurality of UEs that desire to receive the MBMS service using a common bearer.
- eNB which comprises MBSFN (MBMS Single Frequency Network) transmits the same signal all at once, and UE can carry out RF composition of the signal transmitted from each eNB.
- MBSFN MBMS Single Frequency Network
- MTCH Multicast Traffic Channel
- MCCH Multicast Control Channel
- MCH Multicast Channel
- the eNB 200 distributes the MBMS service and MBMS control information for controlling the MBMS service distribution via the multicast channels (MTCH and MCCH).
- MBMS is supported not only in the LTE system but also in UMTS (Universal Mobile Telecommunications System).
- FIG. 6 is a diagram showing an operating environment according to the present embodiment. As shown in FIG. 6, there are a plurality of PLMNs that support MBMS.
- the UE 100 supports a plurality of PLMNs (PLMNs 1 and 2), and performs location registration with the PLMN selected from the plurality of PLMNs.
- PLMNs 1 and 2 a plurality of PLMNs
- PLMNs 1 and 2 are networks with different operators. That is, PLMN1 is a network provided by operator 1, and PLMN2 is a network provided by operator 2.
- PLMNs 1 and 2 are networks with different RATs. That is, PLMN1 is a network that conforms to RAT1 (for example, LTE), and PLMN2 is a network that conforms to RAT2 (for example, UMTS).
- RAT1 for example, LTE
- RAT2 for example, UMTS
- UE 100 is located in an overlapping area between cell A belonging to PLMN 1 and cell B belonging to PLMN 2. Further, the UE 100 uses the cell A belonging to the PLMN 1 as a serving cell, and is connected to the cell A.
- Cell A is managed by eNB 200-1 of PLMN1
- cell B is managed by eNB 200-2 of PLMN2.
- FIG. 7 is an operation sequence diagram according to the present embodiment.
- the UE 100 in the connected state in the cell A may be receiving the MBMS service or may not be receiving the MBMS service.
- step S101 the UE 100 receives from the eNB 200-1 a USD (User Service Description) related to the MBMS service distributed by the PLMN 2.
- USD User Service Description
- USD is configured as a NAS layer message (ie, NAS message).
- USD corresponds to MBMS basic information.
- the USD may include an identifier of an MBMS service distributed by PLMN2. Such a service identifier is referred to as a TMGI (Temporary Mobile Group Identifier).
- the USD may also include information indicating the distribution start time (session start time) of the MBMS service distributed by PLMN 2 and information indicating the distribution end time (session end time) of the MBMS service distributed by PLMN 2. Further, the USD may include information indicating a frequency where the MBMS service is distributed by the PLMN 2 and information indicating a geographical area where the MBMS service is distributed by the PLMN 2.
- step S102 based on the USD regarding the MBMS service distributed by PLMN2, the UE 100 may not be distributed by PLMN 1 but may be distributed by PLMN 2. Judge that there is. Then, the UE 100 determines to try to receive (measure) the MBMS Service Area ID (SAI) and / or MCCH from the PLMN 2 when the signal strength from the cell belonging to the PLMN 2 is equal to or greater than the threshold.
- SAI MBMS Service Area ID
- MCCH MCCH
- SAI and / or MCCH correspond to MBMS detailed information related to the MBMS service.
- the SAI is an identifier indicating a geographical area where the MBMS service is distributed.
- MCCH is a logical channel that transmits MBMS control information.
- step S103 the UE 100 attempts to receive SAI and / or MCCH from the PLMN 2 (eNB 200-2) during a communication interruption period (measurement gap or the like) with the eNB 200-1.
- a communication interruption period measurement gap or the like
- UE 100 confirms that the MBMS service of its own interest is distributed by PLMN 2 based on SAI and / or MCCH.
- step S104 when priority is given to reception of the MBMS service over reception of the unicast service, the UE 100 starts processing for switching from the connected state to the idle state in order to switch from PLMN1 to PLMN2.
- step S105 the UE 100 transmits an RRC connection release request to the eNB 200-1 (cell A) as information for transition from the connected state to the idle state.
- the RRC connection release request is configured as an RRC layer message (ie, an RRC message).
- step S106 the eNB 200-1 notifies the UE 100 that the RRC connection with the UE 100 is released in response to receiving the RRC connection release request from the UE 100. Then, the eNB 200-1 and the UE 100 release the RRC connection. As a result, the UE 100 transitions from the connected state to the idle state.
- step S107 the UE 100 that has transitioned to the idle state reselects the cell B (eNB 200-2) belonging to the PLMN 2 and then receives the MBMS service from the cell B belonging to the PLMN 2. Further, the UE 100 may transition from the idle state to the connected state in the cell B, and receive the MBMS service from the cell B in the connected state. Furthermore, when the cell B (eNB 200-2) supports reception of the MBMS interest notification, the UE 100 may attempt to receive the unicast service together with the reception of the MBMS service by transmitting the MBMS interest notification to the cell B. .
- the MBMS interest notification is a type of RRC message.
- the MBMS interest notification includes frequency information (mbms-FreqList) and priority information (mbms-Priority).
- the frequency information is information indicating the frequency at which the UE 100 is receiving or interested in the MBMS service.
- the priority information is information indicating whether or not the reception of the MBMS service is given priority over the reception of the unicast service.
- the UE 100 releases its RRC connection and reselects the PLMN 2 to thereby renew its interest.
- a certain MBMS service can be received from PLMN2.
- the UE 100 transmits an RRC connection release request to the eNB 200-1 (cell A) as information for transitioning from the connected state to the idle state.
- the UE 100 transmits a special MBMS interest notification to the eNB 200-1 (cell A) instead of the RRC connection release request.
- the frequency information is set to “empty”
- the priority information is set to “MBMS service reception priority”.
- the frequency information indicates that there is no frequency for the UE 100 to receive or to distribute the MBMS service of interest.
- the special MBMS interest notice indicates that the reception of the MBMS service is given priority over the reception of the unicast service.
- the eNB 200-1 When the eNB 200-1 receives a special MBMS interest notification from the UE 100, the eNB 200-1 determines that the UE 100 is interested in the MBMS service distributed by another PLMN, and releases the RRC connection with the UE 100.
- the RRC connection release request according to the above-described embodiment may be applied to uses other than MBMS reception.
- the RRC connection release request can be applied to the case of releasing the RRC connection at the will of the UE 100.
- the inter-device interference (LTE-GPS / WiFi) in the UE 100 is strong and it is desired to move or stop LTE communication to another frequency.
- the eNB 200 does not support the InDeviceCoexIndication message, it is unavoidable.
- UE 100 may transmit an RRC connection release request to the eNB 200.
- 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 it is possible to provide a communication control method, a user terminal, and a processor that enable reception of an MBMS service distributed from a PLMN different from the PLMN to be selected.
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Abstract
Description
実施形態に係る通信制御方法は、MBMSサービスを受信するための方法である。前記通信制御方法は、第1のPLMNに属する第1のセルにおいて接続状態のユーザ端末が、自身の興味のあるMBMSサービスが第2のPLMNで配信されると判断した場合に、前記接続状態からアイドル状態に遷移するための情報を前記第1のセルに送信するステップAと、前記接続状態から前記アイドル状態に遷移した前記ユーザ端末が、前記第2のPLMNに属する第2のセルを再選択した上で、前記第2のセルから前記MBMSサービスを受信するステップBと、を含む。
以下、図面を参照して、3GPP規格に準拠して構成される移動通信システムの一つであるLTE(Long Term Evolution)システムに本発明を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。図1に示すように、LTEシステムは、複数のUE(User Equipment)100と、E-UTRAN(Evolved-UMTS Terrestrial Radio Access Network)10と、EPC(Evolved Packet Core)20と、を含む。E-UTRAN10は無線アクセスネットワークに相当し、EPC20はコアネットワークに相当する。E-UTRAN10及びEPC20は、LTEシステムのネットワークを構成する。
MBMSは、マルチキャスト配信を実現するベアラサービスである。ネットワークは、MBMSサービスの受信を望む複数のUEに対して、共通のベアラで一斉にMBMSサービスを配信することにより、ネットワーク効率及び周波数利用効率を向上できる。また、MBSFN(MBMS Single Frequency Network)を構成するeNBは、同一信号を一斉に送信することにより、UEは各eNBから送信された信号をRF合成できる。
以下において、本実施形態に係る動作について説明する。
上述した実施形態では、UE100は、接続状態からアイドル状態に遷移するための情報として、RRC接続の解放要求をeNB200-1(セルA)に送信していた。
上述した実施形態に係るRRC接続の解放要求は、MBMS受信以外の用途に適用してもよい。具体的には、UE100の意志でRRC接続を解放するケースにRRC接続の解放要求を適用できる。例えば、UE100内でのデバイス間干渉(LTE-GPS/WiFi)が強く、LTE通信を別周波数に移動したい又は停止したいが、eNB200がInDeviceCoexIndication messageをサポートしていないことから、止むを得ずLTE通信を停止するような場合に、UE100がRRC接続の解放要求をeNB200に送信してもよい。
Claims (6)
- MBMSサービスを受信するための通信制御方法であって、
第1のPLMNに属する第1のセルにおいて接続状態のユーザ端末が、自身の興味のあるMBMSサービスが第2のPLMNで配信されると判断した場合に、前記接続状態からアイドル状態に遷移するための情報を前記第1のセルに送信するステップAと、
前記接続状態から前記アイドル状態に遷移した前記ユーザ端末が、前記第2のPLMNに属する第2のセルを再選択した上で、前記第2のセルから前記MBMSサービスを受信するステップBと、
を含むことを特徴とする通信制御方法。 - 前記ステップAは、
前記ユーザ端末が、前記第2のPLMNで配信されるMBMSサービスに関するMBMS基本情報を前記第1のPLMNから受信するステップA1と、
前記ユーザ端末が、前記MBMS基本情報に基づいて、前記第2のPLMNで配信されるMBMSサービスに関するMBMS詳細情報を前記第2のPLMNから受信するステップA2と、
前記ユーザ端末が、前記MBMS詳細情報に基づいて、自身の興味のあるMBMSサービスが前記第2のPLMNで配信されると判断するステップA3と、
を含むことを特徴とする請求項1に記載の通信制御方法。 - 前記ステップAにおいて、前記ユーザ端末は、前記接続状態から前記アイドル状態に遷移するための情報として、RRC接続の解放要求を前記第1のセルに送信することを特徴とする請求項1に記載の通信制御方法。
- 前記ステップAにおいて、前記ユーザ端末は、前記接続状態から前記アイドル状態に遷移するための情報として、周波数情報と優先度情報とを含むMBMS興味通知を前記第1のセルに送信し、
前記周波数情報は、前記ユーザ端末が受信している又は興味のあるMBMSサービスを配信する周波数が無いことを示し、
前記優先度情報は、MBMSサービスの受信をユニキャストサービスの受信よりも優先させることを示すことを特徴とする請求項1に記載の通信制御方法。 - MBMSをサポートするユーザ端末であって、
第1のPLMNに属する第1のセルにおいて接続状態である場合で、かつ、自身の興味のあるMBMSサービスが第2のPLMNで配信されると判断した場合に、前記接続状態からアイドル状態に遷移するための情報を前記第1のセルに送信する制御部を備え、
前記制御部は、前記接続状態から前記アイドル状態に遷移した後、前記第2のPLMNに属する第2のセルを再選択して、前記第2のセルから前記MBMSサービスを受信することを特徴とするユーザ端末。 - MBMSをサポートするユーザ端末に備えられるプロセッサであって、
第1のPLMNに属する第1のセルにおいて接続状態である場合で、かつ、自身の興味のあるMBMSサービスが第2のPLMNで配信されると判断した場合に、前記接続状態からアイドル状態に遷移するための情報を前記第1のセルに送信する処理Aと、
前記接続状態から前記アイドル状態に遷移した後、前記第2のPLMNに属する第2のセルを再選択して、前記第2のセルから前記MBMSサービスを受信する処理Bと、
を実行することを特徴とするプロセッサ。
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WO2022210545A1 (ja) * | 2021-03-29 | 2022-10-06 | 京セラ株式会社 | 通信制御方法及びユーザ装置 |
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