WO2016158266A1 - ユーザ装置 - Google Patents
ユーザ装置 Download PDFInfo
- Publication number
- WO2016158266A1 WO2016158266A1 PCT/JP2016/057374 JP2016057374W WO2016158266A1 WO 2016158266 A1 WO2016158266 A1 WO 2016158266A1 JP 2016057374 W JP2016057374 W JP 2016057374W WO 2016158266 A1 WO2016158266 A1 WO 2016158266A1
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- WIPO (PCT)
- Prior art keywords
- relay terminal
- connection
- base station
- terminal
- remote terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/12—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality
- H04W40/14—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality based on stability
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/30—Connection release
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/40—Connection management for selective distribution or broadcast
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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
- H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/34—Modification of an existing route
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/30—Connection release
- H04W76/38—Connection release triggered by timers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/005—Discovery of network devices, e.g. terminals
Definitions
- the present invention relates to D2D (between user devices) communication, and more particularly to a user device, a connection management method, and an address setting method for managing connections in D2D communication.
- D2D communication also referred to as side link communication, hereinafter referred to as “D2D” in which communication is performed directly between apparatuses UE.
- synchronization between the user apparatuses UE is required for communication and discovery.
- the user apparatus UE within the coverage of the base station eNB can relay the synchronization signal received from the base station eNB to the user apparatus UE outside the coverage of the base station eNB.
- the user apparatus UE outside the coverage of the base station eNB can grasp the synchronization timing of the base station eNB.
- the user equipment UE within the coverage of the base station eNB not only relays the synchronization signal received from the base station eNB to the user equipment UE outside the coverage of the base station eNB, but also the user equipment UE outside the coverage with the base station eNB.
- D2D communication is used for extending the coverage of the base station eNB. That is, a user apparatus UE (hereinafter referred to as “relay terminal”) having a signal relay function within the coverage of the base station eNB is from a user apparatus UE (hereinafter referred to as “remote terminal”) outside the coverage of the base station eNB.
- the remote terminal UE may communicate with the base station eNB. It becomes possible.
- the remote terminal may be not only the user apparatus UE outside the coverage of the base station eNB, but also the user apparatus UE within the coverage of the base station eNB. For example, when the synchronization signal / broadcast information of the base station eNB cannot be received outside the coverage of the base station eNB, when the synchronization signal transmitted by the user apparatus is used as the synchronization source, or because the RRC connection cannot be completed. When the connection to the network is not possible, the user apparatus UE can communicate with the base station eNB as a remote terminal.
- a D2D relay is implement
- the communication quality between the remote terminal UE and the base station eNB depends on the communication quality between the remote terminal UE and the relay terminal UE and the communication quality between the relay terminal UE and the base station eNB. To do.
- the relay terminal UE becomes unsuitable for the D2D relay due to a change in communication quality, the remote terminal UE needs to select another relay terminal UE.
- the remote terminal UE moves within the coverage of the base station eNB, the remote terminal UE can communicate with the base station eNB without going through the relay terminal UE.
- the user apparatus UE in communication with the base station eNB moves out of the coverage of the base station eNB, the user apparatus UE needs to connect to the relay terminal UE as the remote terminal UE.
- the communication path of the D2D relay may change due to a change in communication quality between the remote terminal UE and the base station eNB.
- it is desired that the network connection is maintained.
- the D2D relay is realized on the IP layer
- the remote terminal UE is connected to another relay terminal UE or the base station eNB
- the IP address is set after the connection is performed in the low layer such as the MAC layer. Etc. are performed. During such a connection procedure, the network connection may be disconnected.
- the present invention aims to stabilize the connection between the remote terminal UE and the base station eNB when the communication path of the D2D relay changes.
- a user apparatus that operates as a relay terminal that relays data between a remote terminal and a base station, A transmitting unit that transmits a group cast ID that is a data transmission destination to the remote terminal; A receiver for receiving a connection release request from the remote terminal; When receiving a connection release request from the remote terminal, a connection management unit for releasing the connection with the remote terminal; It is characterized by having.
- the user apparatus which concerns on one form of this invention is A user apparatus that operates as a remote terminal that communicates with a base station via a relay terminal having a function of relaying data, A connection management unit for setting a link with another relay terminal in addition to the relay terminal; A receiving unit that receives a group cast ID that is a data transmission destination from the relay terminal; A transmission unit for transmitting data based on the group cast ID; Have The transmission unit further transmits a connection release request to the relay terminal.
- the user apparatus which concerns on one form of this invention is A user device that operates as a relay terminal that relays data between a remote terminal and a base station, When a connection with the remote terminal is set, a receiving unit that receives address information from the remote terminal, the base station, or another relay terminal; An IP address setting unit for setting an IP address according to the received address information; It is characterized by having.
- the user apparatus which concerns on one form of this invention is A user device that operates as a relay terminal that relays data between a remote terminal and a base station, A receiving unit for receiving connection information indicating that the remote terminal is connected to the base station; When receiving the connection information, a connection management unit for releasing the connection with the remote terminal; It is characterized by having.
- the user apparatus which concerns on one form of this invention is A user apparatus that operates as a remote terminal that communicates with a base station via a relay terminal having a function of relaying data, When moving within the coverage of a base station, a connection management unit connected to the base station, A transmission unit that transmits connection information indicating connection to the base station to the relay terminal; Have The connection management unit releases connection with the relay terminal by transmitting connection information indicating that the base station is connected to the relay terminal.
- the user apparatus which concerns on one form of this invention is A user equipment communicating with a base station, A quality measuring unit for measuring the quality of the link with the base station; When the quality of the link with the base station falls below a threshold, a transmission unit that transmits a connection request to a relay terminal that relays data between the user apparatus and the base station; A connection management unit for setting a connection with the relay terminal; It is characterized by having.
- the present invention when the communication path of the D2D relay changes, it becomes possible to stabilize the connection between the remote terminal UE and the base station eNB.
- FIG. 1 is a schematic diagram of a communication system according to an embodiment of the present invention.
- the communication system which concerns on the Example of this invention is a cellular communication system in which user apparatus UE1 and UE3 exist in the coverage (cell) of base station eNB.
- the user apparatuses UE1 and UE3 in the coverage have a D2D communication function, and it is possible to perform D2D communication with other user apparatuses in the coverage.
- the user apparatuses UE1 and UE3 within the coverage can also perform D2D communication with the user apparatus UE2 outside the coverage.
- the user apparatus UE2 outside the coverage also has a D2D communication function, and can perform D2D communication with other user apparatuses.
- the user apparatuses UE1 and UE3 in the coverage can perform normal cellular communication with the base station eNB.
- the user devices UE1 and UE3 in the coverage are relay terminals having a signal relay function, and can receive data received from the user device UE2 outside the coverage, which is a remote terminal, to the base station eNB. Moreover, the user apparatuses UE1 and UE3 within the coverage can relay the data received from the base station eNB to the user apparatus UE2 outside the coverage.
- the remote terminal UE2 connects to the base station eNB via the relay terminal UE1
- the link between the base station eNB and the relay terminal UE1 is called a backhaul link
- the link between the relay terminal UE1 and the remote terminal UE2 Is called an access link.
- the remote terminal UE2 exists outside the coverage of the base station eNB, but the remote terminal UE2 may exist within the coverage of the base station eNB.
- the synchronization signal / broadcast information of the base station eNB cannot be received outside the coverage of the base station eNB, when the synchronization signal transmitted by the user apparatus is used as the synchronization source, or because the RRC connection cannot be completed.
- the user apparatus UE2 can communicate with the base station eNB as a remote terminal within and outside the coverage of the base station eNB.
- FIG. 2 is a diagram showing a layer structure of the D2D relay.
- the D2D relay is assumed to be realized on the IP layer. Specifically, in order to realize the D2D relay, the remote terminal UE2 receives the address information from the relay terminal UE1 and sets the IP address. For example, when IPv4 is used, the remote terminal UE2 receives an IP address assigned by DHCP (Dynamic Host Configuration Protocol) and sets the IP address. For example, when IPv6 is used, the remote terminal UE2 transmits RS (Router Solicitation) to the relay terminal UE1, and receives prefix information called RA (Router Advertisement) from the relay terminal UE1. The remote terminal UE2 sets an IP address based on the received prefix information.
- RS Raster Solicitation
- RA Raundation Advertisement
- the remote terminal UE2 receives the address information (IP address assigned by DHCP or prefix information called RA) for setting the IP address from the relay terminal UE1, sets the IP address, and sets the IP layer.
- IP packet is transmitted to the relay terminal UE1.
- the IP packet is encapsulated by GTP (GPRS Tunneling Protocol) and transmitted to the core network (Serving GW, PDN GW).
- GTP GPRS Tunneling Protocol
- the IP address setting procedure of the remote terminal UE2 is further described with reference to FIG. An IP address setting procedure when the remote terminal UE2 first connects to the relay terminal UE1 will be described.
- the remote terminal UE2 needs to discover the relay terminal UE1. There are a case where the relay terminal UE1 notifies the remote terminal UE2 of the presence of its own terminal (Model A) and a case where the remote terminal UE2 detects the relay terminal UE1 present in the vicinity (Model B). In any case, the remote terminal UE2 finds the peripheral relay terminal UE1 and selects the relay terminal UE1.
- the remote terminal UE2 transmits DHCP Discovery to the relay terminal UE1 and receives DPCH Offer including IP address candidates. Then, in order to formally obtain IP address candidates, the remote terminal UE2 transmits a DHCP Request, receives a DHCP ACK as a response, and sets an IP address.
- the remote terminal UE2 transmits an RS to the relay terminal UE1, and requests prefix information for setting an IP address.
- the remote terminal UE2 receives the RA including the prefix information and sets the IP address in combination with the MAC address of the own terminal.
- the remote terminal UE2 connects to the base station eNB via the relay terminal UE1.
- the communication quality between the remote terminal UE2 and the base station eNB depends on the communication quality of the access link and the communication link of the backhaul link.
- the relay terminal UE1 becomes unsuitable for the D2D relay due to a change in communication quality, the remote terminal UE2 needs to select another relay terminal UE3 in the coverage.
- the network connection may be disconnected. That is, the network connection is disconnected during a period until the remote terminal UE2 releases the connection with the relay terminal UE1 and thereafter sets an IP address with another relay terminal UE3.
- the network connection is disconnected during a period until the remote terminal UE2 releases the connection with the relay terminal UE1 and thereafter sets an IP address with another relay terminal UE3.
- FIG. 5 is a sequence diagram showing a procedure in which the remote terminal UE2 selects another relay terminal UE3.
- the relay terminal UE1 may measure the quality of the backhaul link, and when the quality of the backhaul link is degraded, the relay terminal UE1 may notify the remote terminal UE2 of the quality degradation (S101).
- the relay terminal UE1 may measure the quality of the access link and notify the remote terminal UE2 of the quality degradation even when the quality of the access link is degraded.
- the remote terminal UE2 selects another relay terminal UE3 and transmits a relay terminal change request to the original relay terminal UE1 and another relay terminal UE3 (S103, S105). ).
- the original relay terminal UE1 or another relay terminal UE3 reports to the base station eNB that there was a request to change the relay terminal, and the relay terminal UE1 and UE3 and the remote terminal UE2 are double-connected for a certain period on the core network. May be allowed.
- the selection of another relay terminal UE3 may be performed periodically.
- the remote terminal UE2 may periodically transmit a D2D signal for quality measurement to enable quality measurement by the relay terminal UE1 and another relay terminal UE3 and relay connection maintenance confirmation by the relay terminal UE1.
- the relay terminal UE1 When the quality of another relay terminal UE3 improves compared to the relay terminal UE1, the relay terminal UE1 notifies the remote terminal UE2 of the quality degradation, so that another relay terminal UE3 can be selected periodically.
- FIG. 5 shows an example in which the remote terminal UE2 transmits a relay terminal change request by notification of quality degradation from the relay terminal UE1, but for example, there is no data to be communicated.
- the relay terminal change request may be transmitted based on the judgment of the remote terminal UE2 itself or the judgment of the base station eNB.
- Another relay terminal UE3 When another relay terminal UE3 receives the relay terminal change request, it transmits a response to the change request to the remote terminal UE2 (S107), and a connection is established between the other relay terminal UE3 and the remote terminal UE2 (S109). ).
- the original relay terminal UE1 receives the relay terminal change request
- a response to the change request is transmitted to the remote terminal UE2 (S111), and the connection between the original relay terminal UE1 and the remote terminal UE2 is released. (S113).
- the original relay terminal UE1 and the remote terminal UE2 after elapse of a certain time (time set from the original relay terminal UE1 or time set in advance) from transmission / reception of the change request of the relay terminal May release the connection autonomously. By applying this operation, the response to the change request of the relay terminal may be omitted.
- each of the original relay terminal UE1 and another relay terminal UE3 transmits a response to the change request in response to the relay terminal change request.
- a response to the change request may be transmitted from the base station eNB to the remote terminal UE2 via the relay terminals UE1 and UE3 according to the judgment of the base station eNB.
- connection with another relay terminal UE3 (S109) and the release of the connection with the original relay terminal UE1 (S113) may be performed in an order different from that in FIG. However, from the viewpoint of stabilizing the connection between the remote terminal UE2 and the base station eNB, as described below, after the connection with another relay terminal UE3 is performed (S109), the original relay terminal It is desirable that the connection with UE1 is released (S113).
- FIG. 6 is a configuration diagram of a relay terminal according to the embodiment of the present invention.
- the relay terminal 100 includes a signal transmission unit 101, a signal reception unit 102, a D2D communication function unit 103, a relay unit 104, a quality measurement unit 105, and a connection management unit 106.
- FIG. 6 shows only functional units that are particularly related to the embodiment of the present invention in the relay terminal 100, and also has a function (not shown) for performing an operation based on LTE or the like.
- the functional configuration shown in FIG. 6 is only an example. As long as the operation according to the present embodiment can be performed, the function classification and the name of the function unit may be anything.
- the relay terminal 100 may be an information communication terminal including a processor such as a CPU (Central Processing Unit), a memory device such as a RAM (Random Access Memory) and a ROM (Read Only Memory), a storage device such as a hard disk, and the like.
- a processor such as a CPU (Central Processing Unit)
- a memory device such as a RAM (Random Access Memory) and a ROM (Read Only Memory)
- a storage device such as a hard disk, and the like.
- each function of the relay terminal 100 may be configured by a processor and a storage device or a memory device, and may be realized by the processor executing data or a program stored in the storage device or the memory device.
- the signal transmission unit 101 includes a function of generating various physical layer signals from the upper layer signal to be transmitted from the relay terminal 100 and wirelessly transmitting the signals.
- the signal transmission unit 101 has a transmission function for D2D communication and a transmission function for cellular communication.
- the signal receiving unit 102 includes a function of wirelessly receiving various signals from other user apparatuses UE or the base station eNB, and acquiring higher layer signals from the received physical layer signals.
- the signal receiving unit 102 has a reception function for D2D communication and a reception function for cellular communication.
- the D2D communication function unit 103 includes D2D application functions, and executes resource allocation and transmission / reception control of Discovery signals, SCI (Sidelink Control Information) / data resource allocation and transmission / reception control, and the like.
- the relay unit 104 includes a function for realizing a D2D relay. Specifically, when the data received from the remote terminal UE2 in the signal reception unit 102 is data addressed to the base station eNB, the relay unit 104 transmits the data from the signal transmission unit 101 to the base station eNB. In addition, when the data received from the base station eNB in the signal receiving unit 102 is data addressed to the remote terminal UE2, the relay unit 104 transmits the data from the signal transmitting unit 101 to the remote terminal UE2.
- the quality measuring unit 105 measures the quality of the backhaul link or access link. When the measured quality falls below the threshold, the signal transmission unit 101 may transmit quality degradation to the remote terminal UE2 or the base station eNB.
- the connection management unit 106 manages the connection with the remote terminal UE2.
- the connection management unit 106 establishes an access link with the remote terminal UE2 in response to a connection request from the remote terminal UE2 or a relay terminal change request (when the connection is changed from another relay terminal UE3 to the relay terminal 100). To do. Further, the connection management unit 106 releases the connection with the remote terminal UE2 by a connection release request from the remote terminal UE2 or a relay terminal change request (when the connection is changed from the relay terminal 100 to another relay terminal UE3). To do.
- connection management unit 106 does not respond to the connection release request or the relay terminal change request, and releases the connection with the remote terminal UE2 after a predetermined time has elapsed since the reception of the connection release request or the relay terminal change request. May be.
- FIG. 7 is a configuration diagram of a remote terminal according to the embodiment of the present invention.
- the remote terminal 200 includes a signal transmission unit 201, a signal reception unit 202, a D2D communication function unit 203, a relay terminal selection unit 204, and a connection management unit 205.
- FIG. 7 shows only functional units particularly related to the embodiment of the present invention in the remote terminal 200, and also has a function (not shown) for performing an operation based on at least LTE. Further, the functional configuration shown in FIG. 7 is merely an example. As long as the operation according to the present embodiment can be performed, the function classification and the name of the function unit may be anything.
- the remote terminal 200 may be an information communication terminal including a processor such as a CPU (Central Processing Unit), a memory device such as a RAM (Random Access Memory) and a ROM (Read Only Memory), a storage device such as a hard disk, and the like.
- a processor such as a CPU (Central Processing Unit)
- a memory device such as a RAM (Random Access Memory) and a ROM (Read Only Memory)
- a storage device such as a hard disk, and the like.
- each function or the like of the remote terminal 200 is configured by a processor and a storage device or a memory device, and may be realized by the processor executing data or a program stored in the storage device or the memory device.
- the signal transmission unit 201 includes a function of generating various types of physical layer signals from a higher layer signal to be transmitted from the remote terminal 200 and wirelessly transmitting the signals.
- the signal transmission unit 201 has a transmission function for D2D communication and a transmission function for cellular communication.
- the signal reception unit 202 includes a function of wirelessly receiving various signals from other user apparatuses UE or the base station eNB and acquiring higher layer signals from the received physical layer signals.
- the signal receiving unit 202 has a D2D communication reception function and a cellular communication reception function.
- the D2D communication function unit 203 includes a function of the D2D application, and executes resource allocation and transmission / reception control of the Discovery signal, resource allocation and transmission / reception control of the SCI / data.
- the relay terminal selection unit 204 receives information indicating that D2D relay is possible from the surrounding relay terminals, information on quality, and the like, thereby managing relay terminal candidates and selecting relay terminals suitable for D2D relay. To do.
- the connection management unit 205 manages the connection with the relay terminals UE1 and UE3.
- the connection management unit 205 receives a response from the relay terminal UE3 in response to the connection request or the relay terminal change request (when the connection is changed from the connected relay terminal UE1 to another relay terminal UE3), the relay terminal UE3 An access link is established between
- the connection management unit 205 receives a response from the relay terminal UE1 in response to a connection release request or a relay terminal change request (when the connection is changed from the connected relay terminal UE1 to another relay terminal UE3), The connection with the relay terminal UE1 is released.
- connection management unit 205 even if the connection management unit 205 does not receive a connection release request or a response to the relay terminal change request, the connection management unit 205 releases the connection with the relay terminal UE1 after a lapse of a certain time from the transmission of the relay terminal change request. May be.
- the remote terminal UE2 selects the relay terminal UE1 or UE3 suitable for the D2D relay, so that the link failure of the D2D relay can be avoided and the connection between the remote terminal UE2 and the base station eNB is stabilized. . Furthermore, the delay at the time of selecting another relay terminal UE3 can be reduced by periodically selecting another relay terminal UE3.
- FIG. 8 is a sequence diagram showing a communication procedure in multilink.
- the remote terminal UE2 selects another relay terminal UE3, and a connection is established with another relay terminal UE3. It shall be. That is, the remote terminal UE2 is connected to the base station eNB via the relay terminal UE1, and is connected to the base station eNB via the relay terminal UE3.
- the relay terminal UE1 transmits a group cast ID that is a data transmission destination to the remote terminal UE2 (S201).
- the relay terminal UE1 sends configuration information (group cast ID, layer 2 / layer 3 address information of the remote terminal UE2, resource information of D2D communication, etc.) for D2D relay to another relay terminal UE3. Transmit (S203). Note that the configuration information for the D2D relay may be transmitted from the base station eNB or the remote terminal UE2 to another relay terminal UE3.
- the remote terminal UE2 performs groupcast transmission of data to the relay terminals UE1 and UE3 according to the groupcast ID notified from the relay terminal UE1 (S205).
- the relay terminals UE1 and UE3 transmit the received data to the base station eNB (S207, S209).
- the base station eNB may discard either one.
- the relay terminal UE3 When the relay terminal UE3 receives data addressed to the remote terminal UE2 from the base station eNB (S211), the relay terminal UE3 transmits the received data to the remote terminal UE2 (S213). In this case, unicast is used.
- the relay terminal UE1 when the relay terminal UE1 receives data addressed to the remote terminal UE2 from the base station eNB (S215), the relay terminal UE1 transmits the received data to the remote terminal UE2 (S217). Also in this case, unicast is used. When the remote terminal UE2 receives duplicate data, it may discard either one.
- the relay terminal UE1 interrupts the D2D relay, and the connection between the relay terminal UE1 and the remote terminal UE2 is released (S221).
- the connection release request is signaling for terminating the D2D relay, and may be an IP address release request, for example.
- the connection release request may be notified from the base station eNB to the relay terminal UE1. Also, as in steps S111 to S113 in FIG. 5, when the relay terminal UE1 responds to a change request from the remote terminal UE2, or when a certain period has elapsed from the change request, the relay terminal UE1 and the remote terminal UE2 Connection may be released.
- the remote terminal UE2 when the setting of the multilink between the remote terminal UE2 and another relay terminal UE3 fails, the remote terminal UE2 does not transmit a connection release request to the relay terminal UE1, and communicates with the base station eNB via the relay terminal UE1. You may communicate.
- the relay terminals UE1 and UE3 according to the embodiment are configured in the same manner as in FIG.
- the relay terminal UE1 the D2D communication function unit 103, the relay unit 104, and the connection management unit 106 are configured as follows in order to realize multi-link communication.
- the D2D communication function unit 103 transmits the group cast ID from the signal transmission unit 101 to the remote terminal UE2. Further, the D2D communication function unit 103 may transmit configuration information for D2D relay from the signal transmission unit 101 to another relay terminal UE3.
- the relay unit 104 determines that the data received from the remote terminal UE2 is data addressed to the base station eNB based on the group cast ID, the relay unit 104 transmits the data from the signal transmission unit 101 to the base station eNB.
- the connection management unit 106 releases the connection with the remote terminal UE2 in response to a connection release request from the remote terminal UE2 or a relay terminal change request (when the connection is changed from the relay terminal 100 to another relay terminal UE3). In addition, the connection management unit 106 does not respond to the connection release request or the relay terminal change request, and releases the connection with the remote terminal UE2 after a predetermined time has elapsed since the reception of the connection release request or the relay terminal change request. May be. That is, since the connection with the remote terminal UE2 is maintained until a request is received from the remote terminal UE2, multi-link communication is realized when the connection between the remote terminal UE2 and another relay terminal UE3 is completed. Is done.
- the remote terminal UE2 is configured in the same manner as in FIG.
- the D2D communication function unit 203 transmits data from the signal transmission unit 101 to the relay terminals UE1 and UE3 in accordance with the group cast ID received from the relay terminal UE1. Further, when the D2D communication function unit 203 receives duplicate data in the signal reception unit 202, it may discard any of them.
- the connection management unit 205 relays the relay terminal UE1 until a response is received from the relay terminal UE1 in response to the connection release request or the relay terminal change request (when the connection is changed from the connected relay terminal UE1 to another relay terminal UE3).
- a response is received from the relay terminal UE1
- the connection management unit 205 releases the connection with the relay terminal UE1 after a lapse of a certain time from the transmission of the relay terminal change request. May be. That is, since the connection with the relay terminal UE1 is maintained until a request to the relay terminal UE1 is made, when the connection between the remote terminal 200 and another relay terminal UE3 is completed, multi-link communication is realized. Is done.
- FIG. 9 is a sequence diagram showing a procedure for continuously using an IP address.
- the remote terminal UE2 selects another relay terminal UE3, and a connection is established with another relay terminal UE3. It shall be. That is, the remote terminal UE2 is connected to the base station eNB via the relay terminal UE1, and is connected to the base station eNB via the relay terminal UE3.
- the remote terminal UE2 transmits address information for setting an IP address to another relay terminal UE3 (S301).
- the address information is the IP address of the remote terminal UE2 in the case of IPv4, and is prefix information for setting the IPv6 address in the case of IPv6.
- the address information may include the layer 2 ID of the remote terminal UE2 and may include an expiration date. The expiration date included in the address information is set to the expiration date for which the remote terminal UE2 continues to use the IP address.
- the relay terminal UE3 sets the IP address of the remote terminal UE2 according to the address information received from the remote terminal UE2. Note that the address information of the remote terminal UE2 may be transmitted from the original relay terminal UE1 or the base station eNB to the relay terminal UE3.
- the relay terminal UE1 interrupts the D2D relay, and the connection between the relay terminal UE1 and the remote terminal UE2 is released (S305).
- the connection release request is signaling for terminating the D2D relay, and may be an IP address release request, for example. However, in order to maintain connectivity on the IP layer, the IP address release request is regarded as a simple D2D relay interruption request, and the IP address is not released in this embodiment.
- the connection release request may be notified from the base station eNB to the relay terminal UE1. Further, as in steps S111 to S113 in FIG. 5, when the relay terminal UE1 responds to the change request from the remote terminal UE2, the connection between the relay terminal UE1 and the remote terminal UE2 may be released.
- the remote terminal UE2 transmits data to the relay terminal UE3 in accordance with the IP address set with the relay terminal UE1 even after the connection with the relay terminal UE1 is released (S307).
- the relay terminal UE3 transmits the received data to the base station eNB (S309).
- the relay terminal UE3 When the relay terminal UE3 receives data addressed to the remote terminal UE2 from the base station eNB (S311), the relay terminal UE3 transmits the received data to the remote terminal UE2 according to the set IP address (S313).
- FIG. 4 when the IP address setting fails or when the connection at the IP layer is not established even when the expiration date included in the address information is reached, between the remote terminal UE2 and the relay terminal UE3, FIG.
- the IP address setting by DHCP as shown in FIG. 4 or the IP address setting by RS / RA as shown in FIG. 4 may be performed.
- the remote terminal UE2 may have another IP address set between the relay terminals UE1 and UE3, respectively.
- the relay terminals UE1 and UE3 according to the embodiment are configured in the same manner as in FIG.
- the connection management unit 106 is configured as follows.
- the connection management unit 106 sets the IP address of the remote terminal UE2 according to the address information received from the remote terminal UE2.
- the connection management unit 106 does not need to set the IP address by DHCP as shown in FIG. 3 in order to set the IP address of the remote terminal UE2, and the IP address by RS / RA as shown in FIG. There is also no need to make settings. However, if the setting of the IP address fails, or if the connection at the IP layer is not established even when the expiration date included in the address information is reached, the connection management unit 106 sets the IP address by DHCP or RS Sets IP address by / RA.
- the remote terminal UE2 is configured in the same manner as in FIG.
- the connection management unit 205 receives a response from the relay terminal UE1 in response to a connection release request or a relay terminal change request (when the connection is changed from the connected relay terminal UE1 to another relay terminal UE3). Even if the connection with the relay terminal UE1 is released, the IP address set with the relay terminal UE1 is continuously used. However, if the setting of the IP address with the relay terminal UE3 has failed, or if the connection at the IP layer has not been established even when the expiration date included in the address information is reached, the connection management unit 205 uses the IP address by DHCP. Address setting or IP address setting by RS / RA is performed.
- the remote terminal UE2 does not need to set the IP address by DHCP or the IP address by RS / RA with the relay terminal UE3, and the remote terminal UE2 And connectivity on the IP layer between the base station eNB and the base station eNB can be maintained.
- FIG. 10 is a sequence diagram showing a procedure when the remote terminal UE2 moves within the coverage of the base station eNB.
- the remote terminal UE2 When the remote terminal UE2 moves into the coverage of the base station eNB while communicating with the relay terminal UE1, the remote terminal UE2 establishes a connection with the base station eNB (S401).
- the remote terminal UE2 When the remote terminal UE2 establishes a connection with the base station eNB, the remote terminal UE2 transmits a connection release request to the relay terminal UE1 (S403), and the connection between the remote terminal UE2 and the relay terminal UE1 is released.
- the connection release request may be transmitted from the base station eNB to the relay terminal UE1. In this manner, the connection between the remote terminal UE2 and the relay terminal UE1 is maintained until the connection between the remote terminal UE2 and the base station eNB is established (RRC_CONNECTED).
- the user apparatus UE2 directly transmits / receives data to / from the base station eNB (S407, S409).
- the relay terminal UE1 is configured in the same manner as in FIG.
- connection management unit 106 receives a connection release request from the remote terminal UE2 or the base station eNB, that is, when receiving connection information indicating that the remote terminal UE2 is connected to the base station eNB. Release the connection with UE2.
- the remote terminal UE2 is configured in the same manner as in FIG.
- connection management unit 205 when the connection management unit 205 moves within the coverage of the base station eNB, the connection management unit 205 establishes a connection with the base station eNB, and then transmits connection information indicating that the connection is established with the base station eNB to the relay terminal UE1. By doing so, the connection with the relay terminal UE1 is released.
- connection between the remote terminal UE2 and the base station eNB is stabilized by maintaining the connection with the relay terminal UE1 until the connection between the remote terminal UE2 and the base station eNB is established.
- FIG. 11 is a sequence diagram showing a procedure when the remote terminal UE2 moves into the coverage of the base station eNB.
- the user apparatus UE2 measures the quality of the link with the base station, and when the quality of the measured link deteriorates, detects the peripheral relay terminal UE1 and transmits a connection request to the detected relay terminal UE1. (S501).
- the user apparatus UE2 When the user apparatus UE2 is connected to the relay terminal UE1 as a remote terminal (S503), the user apparatus UE2 releases the connection with the base station eNB (S505).
- the remote terminal UE2 transmits / receives data to / from the base station eNB via the relay terminal UE1 (S507 to S513).
- the connection of the terminal can be maintained, but the interference due to the communication between terminals within the coverage increases. Therefore, when the user apparatus UE2 moves out of the coverage of the base station eNB in order to reduce interference, only a part of steps S501 to S513 is performed in a state where there is a connection with the base station eNB, and is disconnected from the base station eNB. The rest of the procedure may then be performed. For example, it may be possible to execute in advance until the IP address is issued from the relay terminal.
- the D2D communication may be performed using the D2D configuration information (resource pool or the like) notified from the base station eNB. It is possible to avoid an increase in interference due to connection delay reduction by omitting acquisition of D2D configuration information from a relay terminal and use of preset D2D configuration information for out-of-coverage communication.
- the remote terminal UE2 is configured in the same manner as in FIG.
- the remote terminal UE2 may have a quality measurement unit (not shown) that measures the quality of the link with the base station eNB.
- the quality of the link with the base station eNB may be RSRP (Reference Signal Received Power), transmission of RRC Connection Reestablishment Request, loss of synchronization, or the start of RRC connection re-establishment procedure.
- the connection management unit 205 establishes a connection with the surrounding relay terminal UE1 when the quality with the base station eNB falls below a threshold value. Note that the connection management unit 205 may perform a part of connection such as detection of the peripheral relay terminal UE1 and payout of an IP address from the relay terminal UE1 while being connected to the base station eNB.
- the connection between the user equipment UE2 and the base station eNB is stabilized by establishing the connection with the relay terminal UE1.
- the remote terminal UE2 selects another relay terminal UE3 suitable for the D2D relay, so that the link failure of the D2D relay This can be avoided, and the connection between the remote terminal UE2 and the base station eNB can be stabilized. Furthermore, the delay at the time of selecting another relay terminal UE3 can be reduced by periodically selecting another relay terminal UE3.
- the multilink is set, and data is transmitted from the remote terminal UE2 to the relay terminals UE1 and UE3 by groupcast. This makes it possible to maintain connectivity between the remote terminal UE2 and the base station eNB.
- the remote terminal UE2 can set the IP address by DHCP with the relay terminal UE3. It is not necessary to set or set an IP address by RS / RA, and it becomes possible to maintain connectivity on the IP layer between the remote terminal UE2 and the base station eNB.
- the user is established by establishing the connection with the relay terminal UE1.
- the connection between the device UE2 and the base station eNB is stabilized.
- user devices display terminals and remote terminals
- user devices according to embodiments of the present invention include hardware and software. Or, a combination thereof may be realized.
- an embodiment of the present invention is a program that causes a computer to implement each function of the user device according to the embodiment of the present invention, a program that causes a computer to execute each procedure of the method according to the embodiment of the present invention May be realized.
- the functional units may be used in combination as necessary.
- the method according to the embodiment of the present invention may be performed in an order different from the order shown in the embodiment.
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Abstract
Description
リモート端末と基地局との間でデータを中継するリレー端末として動作するユーザ装置であって、
前記リモート端末に対してデータの送信先であるグループキャストIDを送信する送信部と、
前記リモート端末から接続解放要求を受信する受信部と、
前記リモート端末から接続解放要求を受信した場合、前記リモート端末との接続を解放する接続管理部と、
を有することを特徴とする。
データを中継する機能を有するリレー端末を介して基地局と通信するリモート端末として動作するユーザ装置であって、
前記リレー端末に加えて別のリレー端末との間にリンクを設定する接続管理部と、
前記リレー端末からデータの送信先であるグループキャストIDを受信する受信部と、
グループキャストIDに基づいて、データを送信する送信部と、
を有し、
前記送信部は、更に、接続解放要求を前記リレー端末に送信することを特徴とする。
リモート端末と基地局との間でデータを中継するリレー端末として動作するユーザ装置であって、
前記リモート端末との接続が設定された場合、前記リモート端末、前記基地局又は別のリレー端末からアドレス情報を受信する受信部と、
受信したアドレス情報に従ってIPアドレスを設定するIPアドレス設定部と、
を有することを特徴とする。
リモート端末と基地局との間でデータを中継するリレー端末として動作するユーザ装置であって、
前記リモート端末が前記基地局と接続されたことを示す接続情報を受信する受信部と、
前記接続情報を受信した場合、前記リモート端末との接続を解放する接続管理部と、
を有することを特徴とする。
データを中継する機能を有するリレー端末を介して基地局と通信するリモート端末として動作するユーザ装置であって、
基地局のカバレッジ内に移動した場合、当該基地局と接続する接続管理部と、
前記基地局と接続したことを示す接続情報を前記リレー端末に送信する送信部と、
を有し、
前記接続管理部は、前記基地局と接続したことを示す接続情報を前記リレー端末に送信することにより、前記リレー端末との接続を解放することを特徴とする。
基地局と通信するユーザ装置であって、
前記基地局との間のリンクの品質を測定する品質測定部と、
前記基地局との間のリンクの品質が閾値を下回った場合、前記ユーザ装置と前記基地局との間でデータを中継するリレー端末に接続要求を送信する送信部と、
前記リレー端末との接続を設定する接続管理部と、
を有することを特徴とする。
図1は、本発明の実施例に係る通信システムの概略図である。本発明の実施例に係る通信システムは、基地局eNBのカバレッジ(セル)内にユーザ装置UE1及びUE3が存在するセルラ通信システムである。カバレッジ内のユーザ装置UE1及びUE3はD2D通信機能を有しており、カバレッジ内の他ユーザ装置との間でD2D通信を行うことが可能である。また、カバレッジ内のユーザ装置UE1及びUE3はカバレッジ外のユーザ装置UE2とD2D通信を行うことも可能である。カバレッジ外のユーザ装置UE2もD2D通信機能を有しており、他ユーザ装置との間でD2D通信を行うことが可能である。更に、カバレッジ内のユーザ装置UE1及びUE3は基地局eNBとの間で通常のセルラ通信を行うことが可能である。
(2)元のリレー端末UE1と別のリレー端末UE3との双方によるマルチリンクの設定
(3)元のリレー端末UE1との通信に用いられるIPアドレスの継続利用
また、リモート端末UE2は、基地局eNBのカバレッジ内に移動した場合、リレー端末UE1を経由することなく、基地局eNBと通信することが可能になる。更に、カバレッジ内のユーザ装置が基地局eNBのカバレッジ外に移動する場合、そのユーザ装置は、リモート端末UE2としてリレー端末UE1又はUE3に接続する必要がある。このような場合にも、ネットワーク接続が切断される可能性がある。本発明の実施例では、このような切断を回避してリモート端末UE2と基地局eNBとの間の接続の安定化を図るため、以下の内容について説明する。
(5)ユーザ装置がカバレッジ外に移動するときのリレー端末UE1又はUE3との接続
それぞれの具体的な手順について以下に説明する。
リモート端末UE2は、例えば、リレー端末UE1との通信中にリレー端末UE1からの品質劣化の通知を受信した場合、別のリレー端末UE3を選択し、リレー端末UE1からリレー端末UE3へのリレー端末の変更要求をリレー端末UE1及びUE3に送信する。このように、リレー端末UE1がD2Dリレーに適さなくなった場合、リモート端末UE2は別のリレー端末UE3を選択することにより、リモート端末UE2と基地局eNBとの間の接続の安定が図られる。
リモート端末UE2が別のリレー端末UE3を選択した場合であっても、元のリレー端末UE1は、D2Dリレーを継続することにより、元のリレー端末UE1と別のリレー端末UE3との双方を用いたマルチリンクの設定を可能にする。マルチリンクの設定により、リモート端末UE2と基地局eNBとの間の接続性を維持することが可能になる。
リモート端末UE2は、別のリレー端末UE3に接続した場合であっても、元のリレー端末UE1との通信に用いられるIPアドレスを継続して利用する。IPアドレスを継続して利用することにより、リレー端末UE3とリモート端末UE2との間のIPアドレス設定手順が簡略化され、リモート端末UE2と基地局eNBとの間のIPレイヤ上の接続性を維持することが可能になる。
リモート端末UE2が基地局eNBのカバレッジ内に移動した場合、リモート端末UE2は、リレー端末UE1を経由することなく、基地局eNBと通信することが可能になる。このとき、リモート端末UE2と基地局eNBとの接続が確立されるまでリレー端末UE1との接続を維持することにより、リモート端末UE2と基地局eNBとの間の接続の安定が図られる。
ユーザ装置UE2が基地局eNBのカバレッジ外に移動する場合、ユーザ装置UE2は、例えば基地局eNBのカバレッジ内のリレー端末UE1を経由することで、リモート端末UE2として基地局eNBと通信することが可能になる。
以上のように、本発明の実施例によれば、D2Dリレーの通信経路が変化した場合、リモート端末UEと基地局eNBとの間の接続の安定化を図ることが可能になる。
101 信号送信部
102 信号受信部
103 D2D通信機能部
104 中継部
105 品質測定部
106 接続管理部
200 リモート端末(ユーザ装置)
201 信号送信部
202 信号受信部
203 D2D通信機能部
204 リレー端末選択部
205 接続管理部
Claims (9)
- リモート端末と基地局との間でデータを中継するリレー端末として動作するユーザ装置であって、
前記リモート端末に対してデータの送信先であるグループキャストIDを送信する送信部と、
前記リモート端末から接続解放要求を受信する受信部と、
前記リモート端末から接続解放要求を受信した場合、前記リモート端末との接続を解放する接続管理部と、
を有するユーザ装置。 - 前記基地局との間のリンクの品質又は前記リモート端末との間のリンクの品質を測定する品質測定部を更に有し、
前記送信部は、前記基地局との間のリンクの品質又は前記リモート端末との間のリンクの品質が閾値を下回った場合、品質劣化を前記リモート端末に通知する、請求項1に記載のユーザ装置。 - データを中継する機能を有するリレー端末を介して基地局と通信するリモート端末として動作するユーザ装置であって、
前記リレー端末に加えて別のリレー端末との間にリンクを設定する接続管理部と、
前記リレー端末からデータの送信先であるグループキャストIDを受信する受信部と、
グループキャストIDに基づいて、データを送信する送信部と、
を有し、
前記送信部は、更に、接続解放要求を前記リレー端末に送信するユーザ装置。 - 前記リレー端末から品質劣化が通知された場合、別のリレー端末を選択するリレー端末選択部を更に有する、請求項3に記載のユーザ装置。
- 前記接続管理部は、前記リレー端末から接続解放要求に対する応答を受信した場合、又は前記リレー端末への接続解放要求から一定時間が経過した場合、前記リレー端末との接続を解放する、請求項3又は4に記載のユーザ装置。
- リモート端末と基地局との間でデータを中継するリレー端末として動作するユーザ装置であって、
前記リモート端末との接続が設定された場合、前記リモート端末、前記基地局又は別のリレー端末からアドレス情報を受信する受信部と、
受信したアドレス情報に従ってIPアドレスを設定するIPアドレス設定部と、
を有するユーザ装置。 - リモート端末と基地局との間でデータを中継するリレー端末として動作するユーザ装置であって、
前記リモート端末が前記基地局と接続されたことを示す接続情報を受信する受信部と、
前記接続情報を受信した場合、前記リモート端末との接続を解放する接続管理部と、
を有するユーザ装置。 - データを中継する機能を有するリレー端末を介して基地局と通信するリモート端末として動作するユーザ装置であって、
基地局のカバレッジ内に移動した場合、当該基地局と接続する接続管理部と、
前記基地局と接続したことを示す接続情報を前記リレー端末に送信する送信部と、
を有し、
前記接続管理部は、前記基地局と接続したことを示す接続情報を前記リレー端末に送信することにより、前記リレー端末との接続を解放するユーザ装置。 - 基地局と通信するユーザ装置であって、
前記基地局との間のリンクの品質を測定する品質測定部と、
前記基地局との間のリンクの品質が閾値を下回った場合、前記ユーザ装置と前記基地局との間でデータを中継するリレー端末に接続要求を送信する送信部と、
前記リレー端末との接続を設定する接続管理部と、
を有するユーザ装置。
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CN113396611A (zh) * | 2021-05-07 | 2021-09-14 | 北京小米移动软件有限公司 | 接入失败处理方法、装置、终端设备和存储介质 |
CN113396611B (zh) * | 2021-05-07 | 2024-01-30 | 北京小米移动软件有限公司 | 接入失败处理方法、装置、终端设备和存储介质 |
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