WO2017209005A1

WO2017209005A1 - User device and network device

Info

Publication number: WO2017209005A1
Application number: PCT/JP2017/019754
Authority: WO
Inventors: 真平安川; 聡永田; 理一工藤
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2016-05-31
Filing date: 2017-05-26
Publication date: 2017-12-07
Also published as: JP7169400B2; JPWO2017209005A1; JP2021132403A

Abstract

A user device that supports device-to-device (D2D) communication, wherein the user device is provided with: a transmitter for transmitting, to a network device, a connection request for a D2D connection between the user device and an other user device; a receiver for receiving a connection parameter for the D2D connection from the network device; and a control unit for establishing the D2D connection using the connection parameter.

Description

User device and network device

The present invention relates to a user device that supports D2D and an NW (network) device that communicates with the user device.

In LTE (Long Term Evolution) and LTE successor systems (for example, LTE-A (LTE Advanced), 4G, FRA (Future Radio Access), 5G, etc.), user devices directly do not pass through radio base stations. D2D (Device-to-Device), which is a communication method, has been studied (for example, Non-Patent Document 1).

D2D reduces the traffic between the user apparatus and the base station, and enables communication between user apparatuses even when the base station becomes unable to communicate during a disaster or the like.

D2D is also called D2D discovery (D2D discovery, also referred to as D2D discovery) for finding other user devices that can communicate, and D2D communication (D2D direct communication, direct communication between terminals) for direct communication between user devices. ). Hereinafter, when D2D communication, D2D discovery, and the like are not particularly distinguished, they are simply referred to as D2D. A signal transmitted and received in D2D is referred to as a D2D signal.

Also, in 3GPP (3rd Generation Partnership Project), it is studied to realize V2X by extending the D2D function. Here, V2X is a part of ITS (Intelligent Transport Systems) and, as shown in FIG. 1, V2V (Vehicle Transport Vehicle) means a communication mode performed between automobiles, and is installed on the side of the road with the automobile. V2I (Vehicle to Infrastructure), which means a communication mode performed between a roadside unit (RSU) and V2N (Vehicle to), which means a communication mode between a car and a driver's mobile terminal Nomadic device) and V2P (Vehicle to Pedestrian) which means a communication mode performed between a car and a pedestrian mobile terminal.

Existing D2D (for example, Non-Patent Documents 2 and 3) specified in 3GPP is a technology optimized for multicast communication. Multicast is also assumed in V2X, which is being studied by 3GPP.

Therefore, transmission power control, link adaptation, MIMO, HARQ / CSI feedback, etc., which are functions for realizing optimized unicast communication, are not supported in existing D2D. On the other hand, in the future, use cases where it is desirable to use optimized unicast communication such as low-latency and high-reliability D2D / V2X communication may increase.

In order to realize unicast communication optimized between user apparatuses, it is necessary for each user apparatus to establish a D2D connection using an appropriate connection parameter that matches the capabilities of the user apparatus and the communication partner. It is.

The present invention has been made in view of the above points, and an object of the present invention is to provide a technique that enables D2D connection to be established using appropriate connection parameters between user apparatuses.

According to the disclosed technology, a user device that supports D2D,
A transmission unit for transmitting a connection request for D2D connection between the user device and another user device to a network device;
A receiving unit for receiving connection parameters for the D2D connection from the network device;
And a control unit that establishes the D2D connection using the connection parameter.

According to the disclosed technology, a technology is provided that makes it possible to establish a D2D connection between user apparatuses using appropriate connection parameters.

It is a figure for demonstrating V2X. It is a figure for demonstrating D2D, and shows "D2D discovery." It is a figure for demonstrating D2D, and shows "D2D communication." It is a figure for demonstrating MAC PDU used for D2D communication. It is a figure for demonstrating the format of SL-SCH subheader. It is a figure for demonstrating the example of the channel structure used by D2D. It is a figure which shows the structural example of PSDCH, and shows the example of a resource pool. It is a figure which shows the structural example of PSDCH, and shows the structure of PUSCH base. It is a figure which shows the structural example of PSCCH and PSSCH, and shows the example of a resource pool. It is a figure which shows the structural example of PSCCH and PSSCH, and shows the structure of PUSCH base. It is a figure which shows resource pool configuration, and shows a sub-frame. It is a figure which shows a resource pool configuration, and shows a resource block. It is a figure which shows the structural example of the radio | wireless communications system which concerns on this Embodiment. It is a figure which shows process sequence example 1. FIG. It is a figure which shows process sequence example 2. FIG. It is a figure which shows process sequence example 3. FIG. It is a figure which shows process sequence example 4. FIG. It is a figure which shows the process sequence example 5. FIG. It is a figure for demonstrating the example of the transmission method of a terminal capability, and shows the example which transmits the high capacity | capacitance discovery signal containing UE capability once in 2 times. It is a figure for demonstrating the example of the transmission method of a terminal capability, and shows the example which transmits UE capability by the message different from the message of a discovery signal. It is a figure which shows the process sequence example 6. FIG. FIG. 9 is a diagram for explaining an example of determining operation of terminal autonomous connection / network assist connection, and shows option 1; FIG. 10 is a diagram for explaining an example of determining operation of terminal autonomous connection / network assist connection, and shows option 2; FIG. 10 is a diagram for explaining an example of determination operation of terminal autonomous connection / network assist connection, and shows option 3; It is a figure which shows an example of a function structure of the user apparatus which concerns on this Embodiment. It is a figure which shows an example of a function structure of the NW apparatus which concerns on this Embodiment. It is a figure which shows an example of the hardware constitutions of the user apparatus and NW apparatus which concern on this Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiment described below is only an example, and the embodiment to which the present invention is applied is not limited to the following embodiment. For example, although the wireless communication system according to the present embodiment assumes a system based on LTE, the present invention is not limited to LTE and can be applied to other systems. In addition, in this specification and claims, “LTE” corresponds to not only a communication method corresponding to

Release

8 or 9 of 3GPP but also Release 10, 11, 12, 13, or Release 14 or later of 3GPP. It is used in a broad sense including the fifth generation communication system.

Also, the technology according to the present embodiment is widely applicable to D2D in general. “D2D” includes V2X as its meaning. Further, the term “D2D” is not limited to D2D in LTE but refers to communication between terminals in general.

In addition, “communication” in this specification means general “communication”, and does not limit “D2D communication” as the classification of “D2D” described above. Hereinafter, when referring to “D2D communication” as a classification of “D2D”, it is described as “D2D communication”.

In the embodiment described below, the D2D connection is a unicast D2D connection, but the application destination of the present invention is not limited to unicast. For example, processing such as UE capability acquisition, connection parameter determination, and D2D connection establishment described in the present embodiment may be applied to a group cast D2D connection of 1 to N (N is an integer of 2 or more). In addition, “connection” in the present embodiment means logical connection between devices, and more specifically, means that D2D communication using connection parameters can be performed between devices. To do.

(Outline of D2D)
As described above, the application destination of the present invention is not limited to LTE, but in the implementation of unicast communication in the present embodiment, since a D2D signal defined by LTE can be used, first, it is defined by LTE. An outline of the D2D technology being used will be described. The user apparatus UE in this Embodiment can perform transmission / reception of the D2D signal by the said technique.

As already explained, D2D is broadly divided into “D2D discovery” and “D2D communication”. As for “D2D discovery”, as shown in FIG. 2A, for each Discovery period (also referred to as PSDCH (Physical Sidelink Discovery Channel) period), a resource pool for the Discovery message is secured, and the user apparatus UE within the resource pool A Discovery message (discovery signal) is transmitted. More specifically, there are Type 1 and Type 2b. In Type 1, the user apparatus autonomously selects a transmission resource from the resource pool. In Type 2b, a quasi-static resource is allocated by higher layer signaling (for example, RRC signal).

As for "D2D communication", as shown in FIG. 2B, a resource pool for SCI (Sidelink Control Information) / data transmission is periodically secured. The user apparatus on the transmission side notifies the reception side of the data transmission resource or the like by SCI with the resource selected from the Control resource pool (PSCCH (Physical Sidelink Control Channel) resource pool), and transmits the data with the data transmission resource. . More specifically, “D2D communication” includes Mode1 and Mode2. In Mode 1, resources are dynamically allocated by (E) PDCCH ((Enhanced) Physical Downlink Control Channel) sent from the base station to the user apparatus. In Mode 2, the user apparatus UE autonomously selects transmission resources from the resource pool. The resource pool is notified by SIB (System Information Block) or a predefined one is used.

In LTE, a channel used for “D2D discovery” is called PSDCH, a channel for transmitting control information such as SCI in “D2D communication” is called PSCCH, and a channel for transmitting data is PSSCH (PhysicalＳSidelink Shared Channel). It is called.

As shown in FIG. 3, a MAC (Medium Access Control) PDU (Protocol Data Unit) used for D2D communication includes at least a MAC header, a MAC control element, a MAC SDU (Service Data Unit), and padding. The MAC PDU may contain other information. The MAC header is composed of one SL-SCH (Sidelink Shared Channel) subheader and one or more MAC PDU subheaders.

As shown in FIG. 4, the SL-SCH subheader includes a MAC PDU format version (V), transmission source information (SRC), transmission destination information (DST), Reserved bit (R), and the like. V indicates the MAC PDU format version that is assigned to the head of the SL-SCH subheader and is used by the user apparatus. Information relating to the transmission source is set in the transmission source information. An identifier related to the ProSe UE ID may be set in the transmission source information. Information regarding the transmission destination is set in the transmission destination information. In the transmission destination information, information regarding the transmission destination ProSe Layer-2 Group ID may be set.

An example of the D2D channel structure is shown in FIG. As shown in FIG. 5, a PSCCH resource pool and a PSSCH resource pool used for “D2D communication” are allocated. Also, a PSDCH resource pool used for “D2D discovery” is assigned with a period longer than the period of the channel of “D2D communication”.

Also, PSSS (Primary Sidelink Synchronization signal) and SSSS (Secondary Sidelink Synchronization signal) are used as synchronization signals for D2D. Further, for example, PSBCH (Physical Sidelink Broadcast Channel) for transmitting notification information (broadcast information) such as D2D system band, frame number, and resource configuration information is used for an operation outside the coverage.

FIG. 6A shows an example of a PSDCH resource pool used for “D2D discovery”. Since the resource pool is set by the bitmap of the subframe, it becomes an image resource pool as shown in FIG. 6A. The same applies to the resource pools of other channels. The PSDCH is repeatedly transmitted while being frequency hopped. The number of repetitions can be set from 0 to 3, for example. Also, as shown in FIG. 6B, PSDCH has a PUSCH-based structure and has a structure in which DM-RS (demodulation reference signal) is inserted.

FIG. 7A shows an example of the PSCCH and PSSCH resource pool used for “D2D communication”. As shown in FIG. 7A, the PSCCH is repeatedly transmitted (repetition) once while frequency hopping. The PSSCH is repeatedly transmitted three times while performing frequency hopping. Also, as shown in FIG. 7B, PSCCH and PSSCH have a PUSCH-based structure, and have a structure in which DM-RS is inserted.

FIGS. 8A and 8B show examples of resource pool configuration in PSCCH, PSDCH, and PSSCH (Mode 2). As shown in FIG. 8A, in the time direction, the resource pool is represented as a subframe bitmap. The bitmap is num. Repeated for the number of repetitions. Also, an offset indicating the start position in each cycle is specified.

In the frequency direction, continuous allocation and non-continuous allocation are possible. FIG. 8B shows an example of discontinuous allocation, and a start PRB, an end PRB, and the number of PRBs (numPRB) are designated as illustrated.

(System configuration)
FIG. 9 is a diagram illustrating a configuration example of a radio communication system according to the present embodiment. As illustrated in FIG. 9, the radio communication system according to the present embodiment includes an NW (network) device 20, a user device UE1, and a user device UE2. In FIG. 9, both the user apparatus UE1 and the user apparatus UE2 have both a transmission function and a reception function. Hereinafter, the user apparatus UE1 and the user apparatus UE2 are described as UE1 and UE2, respectively. Further, when UE1 and UE2 are not particularly distinguished, they are simply described as “UE”. In addition, “UE” may be referred to as “terminal”. In the following description, UE1 and UE2 perform different operations, but UE1 and UE2 have the same function, UE2 includes the function of UE1, and UE1 includes the function of UE2.

As described above, the application destination of the present invention is not limited to LTE, but as an example, UE1 and UE2 shown in FIG. 9 each have a function of cellular communication as a UE in LTE, and signal transmission / reception on the above-described channel. It has D2D function including. In addition, UE1 and UE2 have a function of executing an operation described in the present embodiment. Note that the cellular communication function and the existing D2D function may have only a part of functions (a range in which the operation described in this embodiment can be performed) or all functions. May be.

Further, the UE may be any device having a D2D function. For example, the UE is a vehicle, a terminal held by a pedestrian, an RSU (UE type RSU having a UE function), or the like. The UE according to the present embodiment may be a UE having a capability of transmitting and receiving only at one frequency (one carrier), or a UE having a capability of transmitting and receiving simultaneously at a plurality of frequencies (multiple carriers). It may be. In addition, the UE according to the present embodiment performs processing similar to processing such as transmission power control, link adaptation, MIMO transmission / reception, HARQ / CSI feedback, and the like performed between the UE and the eNB in LTE with other UEs. The function to perform between.

The NW device 20 according to the present embodiment is assumed to be a base station, for example, but is a device on the network side higher than the base station (for example, an MME in LTE, a D2D management server, etc.) Also good. Further, the NW device 20 may be a device (system) including a base station and a higher-level network side device.

(Outline of the embodiment)
In the present embodiment, as a method for unicast D2D connection establishment between UE1 and UE2, "network assist connection" using assist from NW device 20 and autonomous between UEs There are two methods of “terminal autonomous connection” for establishing a connection. The state in which “connection establishment” is performed between UE1 and UE2 is a state in which UE1 and UE2 each hold connection parameters and can perform unicast D2D communication using the connection parameters. means. Each of UE1 and UE2 may manage the state where the unicast D2D connection is established as the D2D CONNECTED state (connection state) (hold information indicating that it is in the D2D CONNECTED state). The outline of each method is as follows.

In network-assisted connection, the UE transmits a connection request (connection request) for unicast D2D connection with another UE to the NW device 20. Then, the NW device 20 determines connection parameters for each of the two UEs that perform unicast D2D connection based on the unicast D2D communication capability (UE capability) of each UE that is held, and determines the connection parameters. Transmit to each UE. When each UE receives a connection parameter from the NW device 20, it becomes possible to perform unicast D2D communication using the connection parameter. That is, a unicast D2D connection is established between UEs.

Note that the connection parameters for each of the two UEs may be the same or different between the two UEs.

In terminal autonomous connection, UE capabilities are exchanged between UEs, and connection parameters for establishing a unicast D2D connection are determined by negotiation between UEs.

<Example of connection parameters>
As connection parameters (also referred to as communication parameters) used for unicast D2D connection in the present embodiment, for example, there are the following parameters: transmission power parameter, transmission carrier, reception carrier, transmission resource pool, Reception resource pool, transmission subframe set, reception subframe set, MIMO transmission mode, presence / absence of HARQ feedback, presence / absence of CSI feedback, mode of CSI feedback, inter-UE L1 / L2 control information format, security.

The above is an example, and parameters other than the above may be included. In addition, only some of the above parameters may be used. For example, when the carrier (one carrier or two carriers for transmission / reception) used in unicast D2D communication is determined in advance (eg, when notified in advance by system information, etc.) The carrier information may not be included in the connection parameter notified from the NW device 20 (or negotiated between UEs).

Hereinafter, processing sequence examples 1 to 4 will be described as examples of processing sequences for network-assisted connection in the wireless communication system shown in FIG. 9, and processing sequence examples 5 and 6 will be described as examples of processing sequences for terminal autonomous connection. explain. In addition, an example of the operation of determining whether to select terminal autonomous connection or network assist connection will be described.

In the following processing sequence examples 1 to 6, a unicast D2D connection is established between UE1 and UE2. In processing sequence examples 1 to 4, it is assumed that UE 2 makes a connection request to NW device 20. A UE that makes a connection request to the NW device 20 may be referred to as a “requesting terminal”, and a UE with which the “requesting terminal” is a unicast D2D communication partner may be referred to as a “requested terminal”. In the following example, UE2 becomes a requesting terminal and UE1 becomes a requested terminal.

(Network Assist Connection: Processing Sequence Example 1)
First, a processing sequence example 1 in network-assisted connection will be described with reference to FIG. In FIG. 10, UE1 that is a requested terminal is in an RRC CONNECTED state (hereinafter simply referred to as a CONNECTED state) with respect to NW device 20. The user apparatus UE2 that is the requesting terminal is also in the CONNECTED state. Alternatively, in the RRC IDLE state (hereinafter simply referred to as the IDLE state), the connection to the NW device 20 is performed before step S102, and the CONNECTED state is set.

Further, both UE1 and UE2 notify their NW device 20 of their own UE capability (UE capability), and the NW device 20 holds the UE capability for each UE.

In Processing Sequence Example 1, UE1 transmits a discovery signal periodically, for example. The discovery signal may be a signal transmitted by the PSDCH described above, a signal transmitted by a D2D channel other than PSDCH (eg, PSBCH, PSCCH / PSSCH), or an existing D2D signal. It may be a signal transmitted on a channel other than the channel. The discovery signal includes the ID of UE1. This ID may be an ID for D2D (for side link), or an ID that serves as both an ID for D2D and an ID for cellular communication. The discovery signal may include both the D2D ID and the cellular communication ID. The discovery signal may include an operator ID that is an ID of an operator to which the UE 1 belongs. Note that “cellular communication” in the present embodiment refers to communication between UEs performed via the NW device 20.

In step S101, UE2 receives the discovery signal from UE1. The UE 2 determines that the unicast D2D connection is performed between the UE 2 and the UE 1 by using the network assist connection by a determination operation described later, and transmits a connection request to the NW device 20 (step S102).

The connection request transmitted in step S102 includes the ID of UE1 that is the communication partner of UE2. This ID may be an ID for D2D, or an ID that serves as both an ID for D2D and an ID for cellular communication. The connection request may include both the D2D ID and the cellular communication ID. The connection request may include an operator ID that is an ID of an operator to which the UE 1 belongs. The connection request includes the ID of UE2. The ID of UE1 is ID1, and the ID of UE2 is ID2.

In addition, the connection request may further include all or part of the following information (1) to (3).

(1) Channel quality (for example, reception level, reception quality, propagation loss) between UE1 and UE2 measured by UE2 using, for example, a reception discovery signal;
(2) Desired QoS and / or desired communication type desired by UE2 in unicast D2D communication with UE1 (eg, information indicating whether or not GBR, desired bit rate);
(3) Location information and / or communication range of the requesting terminal (UE2) and / or the requested terminal (UE1).

The NW device 20 that has received the connection request in step S102 uses the ID1 and ID2 from the UE capabilities for each UE stored in the memory or the like, thereby enabling the UE capability corresponding to the UE1 (UE capability 1). The UE capability (UE capability 2) corresponding to UE2 is acquired. Then, the NW device 20 determines a communication path (unicast D2D or cellular communication) between the UE1 and the UE2 based on the UE capability 1 and the UE capability 2, and determines the unicast D2D as the communication path. In that case, the connection parameters for UE1 and UE2 are determined, and the determined connection parameters are transmitted to UE1 and UE2 respectively (steps S103 and S104).

Regarding the determination of the communication path, for example, when the NW device 20 detects that the UE 1 does not have the unicast D2D capability based on the UE capability 1 of the UE 1 that is the requested terminal, the NW device 20 performs the communication between the UE 1 and the UE 2 in the cellular communication. Decide to communicate. In this case, for example, the cellular communication is instructed to the UE 2 without determining / notifying the connection parameter. Communication paths other than unicast D2D may include communication via a relay terminal in addition to cellular communication.

Further, for example, when the NW device 20 detects that the channel quality included in the connection request is lower (bad) than a value necessary for securing the desired QoS level (or desired communication type), the UE 1 performs cellular communication. And decide to perform communication between UE2.

When the unicast D2D is determined as the communication path, the NW device 20 determines the connection parameters within a range not exceeding the UE capability 1 and the UE capability 2, for example. For example, when the NW device 20 grasps that the UE1 has the capability of MIMO transmission / reception of two layers and knows that the UE2 has the capability of MIMO transmission / reception of four layers, the NW device 20 transmits and receives the MIMO transmission / reception to each of the UE1 and UE2. “2 layers” is notified as a spatial multiplexing parameter. In this case, UE1 and UE2 perform unicast D2D connection establishment using "2 layers" as a spatial multiplexing parameter. That is, each of UE1 and UE2 sets (2 layers) as a spatial multiplexing parameter, and manages (controls) to perform unicast D2D communication using the “2 layers”.

Also, for example, based on the channel quality information, the NW device 20 determines a larger transmission power (transmission power not exceeding the UE capability) as a parameter when the quality is lower than when the quality is higher, Notice.

The connection is established between UE1 and UE2 that have received the connection parameters in steps S103 and S104, and unicast D2D communication is started (step S105). Note that after UE1 and UE2 receive connection parameters from NW device 20, UE2 sends a connection request for connection permission to UE1 (or from UE1 to UE2), and from UE1 to UE2 (or from UE2 to UE1). Connection establishment may be performed after connection permission is transmitted. In this case, for example, when UE2 receives connection permission from UE1, the state of D2D connection is set to a connection state (connection establishment state), and UE1 changes the state of D2D connection when it transmits connection permission to UE2. The connection state (connection establishment state) is set, and unicast D2D communication starts thereafter.

When unicast D2D communication is started, when transmission data is generated, each UE transmits the transmission data using resources, a transmission method, and the like according to its connection parameters related to connection establishment, The received signal is monitored (demodulation and decoding operations are performed) using resources, reception methods, etc. according to its own connection parameters.

(Network assist connection: Processing sequence example 2)
Next, a processing sequence example 2 in the network assist connection will be described with reference to FIG. Also in FIG. 11, similarly to the case of FIG. 10, UE1 that is a requested terminal is in a CONNECTED state with respect to the NW device 20. The requesting terminal UE2 is also in the CONNECTED state. Or if it is an IDLE state, it will connect to the NW apparatus 20 before step S201, and will be in a CONNECTED state.

In processing sequence example 2, UE1 does not transmit a discovery signal. Alternatively, UE1 transmits a discovery signal, but UE2 does not (cannot) receive the discovery signal. Further, it is assumed that UE2 does not measure (cannot measure) the reception level of the signal from UE1. However, UE2 knows the ID of UE1 and wishes to make a unicast D2D connection with UE1.

In step S201, UE2 wishes to establish a unicast D2D connection with UE1, and transmits a connection request to NW device 20. The information included in the connection request is as described above. However, in this example, channel quality information is not included in the connection request. Note that UE2 may include information indicating that a discovery signal has not been received from UE1 in the connection request.

When the NW device 20 that has received the connection request in step S201 detects that the channel quality information is not included in the connection request (or includes information indicating that the discovery signal has not been received from the UE1). If it is detected), a discovery signal transmission instruction is transmitted to UE1 (step S202), and a discovery signal reception instruction is transmitted to UE2 (step S203). For example, the discovery signal transmission instruction includes information on a resource (for example, one or more of a carrier, a frequency resource, and a time resource) used for transmission of the discovery signal, and the discovery signal reception instruction also includes information on the resource. Contains information. Thereby, UE2 can receive the discovery signal transmitted from UE1 efficiently.

In the example of FIG. 11, the NW device 20 transmits a discovery signal transmission instruction to the UE 1 and transmits a discovery signal reception instruction to the UE 2. Instead, the NW device 20 transmits to the UE 2. It is good also as transmitting a discovery signal transmission instruction | indication and transmitting a discovery signal reception instruction | indication with respect to UE1. In this case, channel quality information to be described later is transmitted from the UE 1 to the NW device 20. Further, the NE device 20 may transmit only the discovery signal transmission instruction, or may transmit only the discovery signal reception instruction.

In step S204, a discovery signal is transmitted from UE1 according to the instruction, and UE2 receives the discovery signal and measures the channel quality between UE1 and UE2.

In step S205, UE2 transmits information on the channel quality to NW device 20. Note that measurement and reporting of channel quality between UE1 and UE2 in UE2 may be performed only when the measurement instruction is included in the discovery signal reception instruction received from NW device 20.

Receiving the channel quality information, the NW device 20 receives the communication path (unicast D2D or cellular) between the UE1 and the UE2 based on the UE capability 1 and the UE capability 2 as in the case of the processing sequence example 1. In the case where unicast D2D is determined as a communication path, connection parameters for UE1 and UE2 are determined, and the determined connection parameters are transmitted to UE1 and UE2 respectively (steps S206 and S207). ). Then, a connection is established between UE1 and UE2, and unicast D2D communication is started (step S208).

In the processing sequence examples 1 and 2 described above, the channel quality information between UEs reported from the UE is used in the determination of the communication path and the determination of the connection parameter in the NW device 20, but the channel quality information Is not essential, and the communication path and the connection parameter may be determined only from the UE capability, for example, without using the channel quality information.

(Network Assist Connection: Processing Sequence Example 3)
Next, a processing sequence example 3 in the network assist connection will be described with reference to FIG. In the case of FIG. 12, UE1 that is a requested terminal is assumed to be in the IDLE state with respect to NW device 20. The requesting terminal UE2 is in the CONNECTED state. Further, both UE1 and UE2 notify the NW device 20 of their own UE capabilities (UE capability), and the NW device 20 holds the UE capability for each UE. Further, the NW device 20 holds state information (information indicating whether it is a CONNECTED state or an IDLE state) for each UE.

In step S301, UE2 wishes to establish a unicast D2D connection with UE1, and transmits a connection request to NW device 20. This connection request is, for example, a connection request similar to the connection request in step S102 shown in FIG. 10, and the information included in the connection request is as described above.

The NW device 20 that has received the connection request, similarly to the case of the processing sequence example 1, determines the communication path (unicast D2D or cellular communication) between the UE1 and the UE2 based on the UE capability 1, the UE capability 2, and the like. ), And when unicast D2D is determined as the communication path, the connection parameters for UE1 and UE2 are determined.

However, in this example, since UE1 is in the IDLE state (standby state), the connection parameters cannot be transmitted to UE1 as in processing sequence examples 1 and 2. Therefore, in this example, the NW device 20 transmits a special paging message to the UE 1 (step S302). Note that the NW device 20 (assuming that it is a core-side device in this case) uses the location information of the requested terminal (UE1) included in the connection request to transmit a special paging message. May be selected.

In normal LTE processing, a UE in IDLE state that has received a normal paging message performs RRC connection establishment processing through a random access procedure and enters a CONNECTED state. On the other hand, the paging message transmitted in step S302 of this example causes UE1 to receive information on a specific resource without causing UE1 to transition to the CONNECTED state. Thereby, the signaling overhead concerning the transition to the CONNECTED state such as the random access procedure and the RRC connection establishment process can be reduced.

For example, the paging message transmitted in step S302 includes a special flag (special で flag). The UE1 recognizes that the paging message is a special paging message by detecting the flag in the paging message, and performs the following operation without performing the operation for transitioning to the CONNECTED state.

The UE 1 that has received the paging message performs monitoring (demodulation / decoding operation) on resources in a predetermined downlink control CH (channel) search space. In order to reduce battery consumption, the time length for monitoring may be limited to a predetermined time length from the time when the paging message is received.

The NW device 20 uses the resources in the downlink control CH search space to transmit a connection parameter addressed to the UE1, and the UE1 receives the connection parameter (step S303).

The information indicating the downlink control CH search space (eg, information on the time frequency domain) is notified to the UE 1 by system information (eg, specific SIB) broadcast from the NW device 20, for example. At this time, the ID of UE1 is included in the system information, and UE1 can acquire individual information addressed to UE1 (information indicating the downlink control CH search space). When the system information is changed, for example, by including the above information in the system information, the change is notified to the UE by paging or the like, but as described above, the information addressed to UE1 is added to the system information. Therefore, it is not necessary to notify other than UE1 of the change of system information.

Further, the connection parameter notification in step S303 may be performed using system information in the same manner as the notification of information indicating the downlink control CH search space.

In step S304, the connection parameters for UE2 are notified to UE2, unicast D2D connection is established, and unicast D2D communication is started (step S305).

(Network Assist Connection: Processing Sequence Example 4)
Next, a processing sequence example 4 in the network assist connection will be described with reference to FIG. Also in the case of FIG. 13, UE1 that is a requested terminal is in the IDLE state with respect to NW device 20. Hereinafter, differences from the processing sequence example 3 will be mainly described.

In step S401, UE2 wishes to establish a unicast D2D connection with UE1, and transmits a connection request to NW device 20.

Also in this example, the NW device 20 transmits a special paging message (including a special flag) to the UE 1 (step S402).

In this example, the paging message is for causing UE1 to perform terminal autonomous connection without causing UE1 to transition to the CONNECTED state.

That is, UE1 recognizes that this paging message is a special paging message by detecting the flag in the paging message, and performs terminal autonomous connection without performing an operation for transitioning to the CONNECTED state. Execute (Step S404). Details of the terminal autonomous connection will be described later.

More specifically, for example, setting information (transmission carrier, reception carrier, transmission resource, reception resource, etc.) for discovery signal transmission / reception for terminal autonomous connection based on system information from the NW device 20 to the UE1 and UE2 UE1 (and UE2) transmit discovery signals or receive discovery signals in accordance with the setting information, and establish connection as described later.

Further, as shown in step S403 of FIG. 13, the UE 2 may be notified of information instructing terminal autonomous connection. UE2 which received this notification can determine performing terminal autonomous connection. If the notification is not performed, the UE 2 decides to perform the terminal autonomous connection when, for example, the connection parameter is not received from the NW device 20 even after a predetermined time has elapsed since the connection request is transmitted. Also good.

In the processing sequence examples 3 and 4, the NW device 20 is supposed to transmit a special paging message to the UE 1 by using a connection request from the UE 2 to the NW device 20 as a trigger. It is not limited to the connection request. Even if there is no connection request, for example, a special paging message may be transmitted to the UE triggered by the arrival of a certain time. Further, when both the UE1 and UE2 are in the IDLE state, the NW device 20 may transmit a special paging message to both the UE1 and the UE2 when the unicast D2D connection is made between the UE1 and the UE2. Good. In this case, both UE1 and UE2 can establish connection by, for example, terminal autonomous connection without transitioning to the CONNECTED state.

(About the effect of network assist connection)
As described above, even when a discovery signal is not transmitted and received between UEs that are unicast D2D connection targets, it is possible to perform unicast communication (D2D or cellular) between the UEs. Thereby, it is possible to reduce transmission / reception of unnecessary discovery signals, delay associated with UE discovery, and the like.

Also, it becomes possible to select an appropriate communication path (D2D or cellular) corresponding to the UE capability or channel quality. In addition, since a transmission / reception subframe in D2D connection can be set as a connection parameter, for example, simultaneous transmission / reception with a cellular link can be avoided.

Next, terminal autonomous connection will be described.

(Terminal autonomous connection: processing sequence example 5)
With reference to FIG. 14, the process sequence example 5 which is an example of a terminal autonomous connection is demonstrated. First, as a premise, it is assumed that synchronization between UE1 and UE2 is established by PSSS / SSSS or the like.

In step S501, UE1 transmits a discovery signal including UE capability 1 which is UE capability of UE1, UE2 receives the discovery signal, and UE2 detects discovery signal including UE capability 2 which is UE capability of UE2. UE1 receives the discovery signal. Through step S501, UE1 can acquire UE capability 2 of UE2, and UE2 can acquire UE capability 1 of UE1. The discovery signal may be a signal transmitted by PSDCH, a signal transmitted by a D2D channel other than PSDCH (eg, PSBCH, PSCCH / PSSCH), or other than an existing D2D channel It may be a signal transmitted on the other channel.

Here, for example, when UE2 detects that the quality of the discovery signal received from UE1 is better than a predetermined threshold and UE1 has the capability of unicast D2D, it performs terminal autonomous connection with UE1. And a connection request is transmitted to UE1. The connection request may be a signal transmitted by PSDCH, a signal transmitted by a D2D channel other than PSDCH (eg, PSBCH, PSCCH / PSSCH), or an existing D2D channel. It may be a signal transmitted on a channel other than. The connection request includes, for example, the ID of the request source UE 2 and the ID of the connection request destination UE 1. The connection request includes information indicating that a unicast D2D connection is desired.

When UE1 permits unicast D2D connection with UE2, UE1 transmits a connection permission to UE2. The connection permission may be a signal transmitted by PSDCH, a signal transmitted by a D2D channel other than PSDCH (eg, PSBCH, PSCCH / PSSCH), or other than an existing D2D channel It may be a signal transmitted on the other channel.

In step S504, UE1 transmits a connection parameter desired to be used in UE1 to UE2, and UE2 transmits a connection parameter desired to be used in UE2 to UE1. For example, if UE1 determines that the connection parameter received from UE2 matches (eg, is the same as) the connection parameter desired by UE1, it transmits information indicating that the connection parameter received from UE2 is accepted to UE2. When UE2 determines that the connection parameter received from UE1 matches the connection parameter desired by UE2, information indicating that the connection parameter received from UE1 is accepted is transmitted to UE1. Thereby, the mutual connection parameters are determined, and the connection is established in step S505 using the connection parameters, and unicast D2D communication is started.

In addition, for example, when there is a parameter that UE1 desires to modify among the connection parameters received from UE2, UE1 notifies UE2 of the modified parameter, for example, when 4 layer transmission is desired to be 2 layer transmission. In this way, negotiation is performed, and parameters are corrected and determined.

Note that the connection parameters desired by the UE 2 may be included in the connection request in step S502. Further, the connection parameter desired by UE1 may be included in the connection permission in step S503.

<About UE capability transmission method>
As described above, in the processing sequence example 5, since the UE capability is transmitted using the discovery signal, the message size may increase and the overhead may increase. Therefore, in order to reduce overhead, the UE may transmit the UE capability in a longer period than the discovery signal.

For example, as shown in FIG. 15A, the UE transmits a large-capacity discovery signal including the UE capability once every two discovery signal transmissions. Note that once every two times is an example, and in general, transmission may be performed once every N times (N is an integer of 2 or more).

In the example shown in FIG. 15A, in order to avoid an increase in blind detection of the receiving UE, the transmittable discovery signal format may be limited for each TTI or for each subframe. Further, for example, the discovery signal format may be set in resource pool cycle units, SFN units, or DFN units by setting in system information or in advance. Further, a message-based discovery signal composed of control signals / data may be used as the discovery signal.

Further, as shown in FIG. 15B, the UE may transmit the UE capability in a message different from the discovery signal message. In the example of FIG. 15B, as indicated by “A”, for example, the discovery-side UE includes information on time-frequency resources for UE capability notification (reception), and the receiving-side UE Resources may be used to receive UE capabilities. In this case, a common identifier may be included in the discovery signal message and the UE capability message that form a pair.

In the example of FIG. 15B, in order to avoid an increase in blind detection of the receiving side UE when transmitting a discovery signal and UE capability on the same channel, the message size is made common by zero padding or the like, and both are set by flags in the message. It may be possible to identify them. Note that the UE may transmit the discovery signal and the UE capability on different channels.

(Terminal autonomous connection: processing sequence example 6)
With reference to FIG. 16, a processing sequence example 6 which is another example of the terminal autonomous connection will be described. Hereinafter, differences from the processing sequence example 5 will be mainly described.

In step S601, UE1 and UE2 transmit and receive discovery signals, respectively. Unlike the processing sequence example 5, the discovery signal does not include the UE capability.

Here, for example, UE2 determines to perform terminal autonomous connection with UE1, and transmits a connection request and the UE capability of UE2 to UE1 (step S602).

When the UE1 permits the unicast D2D connection with the UE2, the UE1 transmits the connection permission and the UE capability of the UE1 to the UE2.

As in the case of the processing sequence example 5, the connection parameters of the UE1 and the UE2 are determined (step S604), the connection is established in the step S605, and the unicast D2D communication is started.

In Processing Sequence Example 6, if unicast D2D connection is not performed, transmission of UE capability is not necessary, and overhead can be reduced.

In either of the processing sequence example 5 and the processing sequence example 6, when the UE that can relay the communication of the UE1 receives the connection request transmitted from the UE2, the relayable UE responds (connection permission). May be transmitted to UE2. In this case, even if UE1 cannot establish unicast D2D connection with UE2, unicast communication can be performed on the route of “UE2-relay capable UE-UE1”.

(Example of terminal autonomous connection / network assist connection judgment)
The UE in the present embodiment can determine, for example, the method described below, which one of the terminal autonomous connection and the network assist connection is used in establishing the unicast D2D connection. Three examples (options 1 to 3) will be described below. The following description is based on the configuration example shown in FIG.

<Option 1: Judgment based on discovery signal>
In option 1, as shown in FIG. 17A, UE2 determines whether to use terminal autonomous connection or network assist connection based on the discovery signal received from UE1. Here, it is assumed that information necessary for determination (eg, whether UE1 is in the RRC connection state, the ID of the cell to which UE1 is connected, the ID of the operator to which UE1 belongs) is included in the discovery signal.

Based on the discovery signal received from UE1, UE2, for example, determines that network assist connection is possible and determines to perform network assist connection when UE1 is in the RRC connection state in the same cell as UE2. Further, for example, when the operator to which UE1 belongs is different from the operator of UE2, UE2 determines not to perform network assist connection.

Option 1 makes it possible to establish a connection according to the state of the UE that is the communication partner, and to reduce the connection delay and connection failure probability.

<Option 2: Judgment based on instructions from NW device>
In option 2, as shown in FIG. 17B, when the UE 2 is set to use the network assist connection from the network (specifically, the NW device 20 in this example), the UE 2 sets the setting. Accordingly, it is determined that the network assist connection is performed (that is, the connection request is transmitted to the NW device 20).

In option 2, by setting to use network-assisted connection, it is possible to determine whether or not unicast D2D connection is permitted on the network side, and efficient cellular / D2D communication path selection is possible. . For example, it is possible to determine that unicast D2D is permitted only at the cell edge.

<Option 3: Judgment based on presence / absence of communication partner UE, capability information>
In option 3, as shown in FIG. 17C, UE2 cannot discover UE1 that it wants to be a communication partner of unicast D2D (when it does not receive a discovery signal from UE1), or it can discover channel quality (reception level). , Reception quality, etc.) is below a predetermined threshold, or when the UE capability of UE1 is unknown, connection establishment with a network-assisted connection is attempted. Option 3 is preferably applicable when the communication partner is not transmitting a discovery signal, when the UE 2 is not monitoring communication between terminals, or when terminal autonomous connection has failed.

In the above, options 1 to 3 have been described, but any two or all of options 1 to 3 may be applied in combination.

(Device configuration)
A functional configuration example of the UE and the NW device 20 that performs the operation of the embodiment described above will be described.

(User device)
FIG. 18 is a diagram illustrating an example of a functional configuration of the UE according to the embodiment. As illustrated in FIG. 18, the UE includes a signal transmission unit 101, a signal reception unit 102, a determination unit 103, and a communication control unit 104. FIG. 18 shows only functional units that are particularly related to the embodiment of the present invention in the UE, and has at least a function (not shown) for performing an operation based on LTE. Further, the functional configuration shown in FIG. 18 is merely an example. As long as the operation according to the present embodiment can be executed, the function classification and the name of the function unit may be anything.

The signal transmission unit 101 has a D2D signal transmission function and a cellular communication transmission function. The D2D signal transmission function creates a D2D transmission signal and transmits the signal wirelessly. The transmission function of cellular communication creates a transmission signal to be transmitted by UL of cellular communication and transmits the signal wirelessly.

The signal receiving unit 102 includes a function of wirelessly receiving various signals from other user devices or the NW device 20, and acquiring higher layer signals from the received physical layer signals. The signal receiving unit 102 has a D2D signal reception function and a cellular communication reception function.

The determination unit 103 determines whether to perform unicast D2D connection by terminal autonomous connection or unicast D2D connection by network assist connection by the method described with reference to FIGS. 17A to 17C, for example. The determination result is notified to the communication control unit 104.

The communication control unit 104 controls the signal transmission unit 101 / signal reception unit 102 to cause the signal transmission unit 101 / signal reception unit 102 to execute the operation of the UE described with reference to the processing sequence examples 1 to 6. The communication control unit 104 also includes a storage unit that holds connection parameters and setting information received from the NW device 20, and controls the signal transmission unit 101 / signal reception unit 102 according to the connection parameters / setting information stored in the storage unit. To do. Further, the communication control unit 104 holds state information indicating whether or not a unicast D2D connection is established. For example, when a unicast D2D connection with a certain communication partner UE is established by using a certain connection parameter, the communication control unit 104 determines the connection parameter, the ID of the communication partner UE, and the unicast D2D connection. Status information including information indicating the established state is held. Note that “establishing a D2D connection using connection parameters” means that the UE is set in a state where D2D communication can be performed by using (setting) the connection parameters. If there is transmission data, the transmission is performed and the reception signal is monitored.

(NW device 20)
FIG. 19 is a diagram illustrating an example of a functional configuration of the NW device 20 according to the present embodiment. As illustrated in FIG. 19, the NW device 20 includes a signal transmission unit 201, a signal reception unit 202, a determination unit 203, and a communication control unit 204. Note that FIG. 19 shows only functional units that are particularly related to the embodiment of the present invention in the NW device 20, and has at least a function (not shown) for performing an operation based on LTE. Further, the functional configuration shown in FIG. 19 is merely an example. As long as the operation according to the present embodiment can be executed, the function classification and the name of the function unit may be anything.

The signal transmission unit 201 includes a function of generating a signal to be transmitted to the UE side and transmitting the signal to the UE side. The signal reception unit 202 includes a function of receiving various signals transmitted from the UE, and acquiring, for example, higher layer information from the received signals.

When the determination unit 203 receives a connection request from the UE, the determination unit 203 determines a communication path and a connection parameter by the method described so far.

The communication control unit 204 causes the signal transmission unit 201 / signal reception unit 202 to execute the operations of the NW device 20 described with reference to the processing sequence examples 1 to 4 other than the communication path determination operation and the connection parameter determination operation. The signal transmission unit 201 / signal reception unit 202 are controlled as described above.

<Hardware configuration>
The block diagrams (FIGS. 18 and 19) used in the description of the above embodiment show functional unit blocks. These functional blocks (components) are realized by any combination of hardware and / or software. Further, the means for realizing each functional block is not particularly limited. That is, each functional block may be realized by one device in which a plurality of elements are physically and / or logically combined, or two or more devices physically and / or logically separated may be directly and directly. It may be realized by a plurality of these devices connected indirectly (for example, wired and / or wirelessly).

For example, both the UE and the NW device 20 in an embodiment of the present invention may function as a computer that performs processing according to the present embodiment. FIG. 20 is a diagram illustrating an example of a hardware configuration of the UE and the NW device 20 according to the embodiment. The above-described UE and NW device 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

In the following description, the term “apparatus” can be read as a circuit, a device, a unit, or the like. The hardware configuration of the UE and the NW device 20 may be configured to include one or a plurality of devices indicated by 1001 to 1006 shown in the figure, or may be configured not to include some devices. Good.

Each function in the UE and the NW device 20 reads predetermined software (program) on hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculation, and communication by the communication device 1004, memory 1002 and storage This is realized by controlling reading and / or writing of data in 1003.

The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like.

Further, the processor 1001 reads a program (program code), software module, or data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, the signal transmission unit 101, the signal reception unit 102, the determination unit 103, and the communication control unit 104 of the user apparatus UE may be realized by a control program stored in the memory 1002 and operating on the processor 1001. In addition, the signal transmission unit 201, the signal reception unit 202, the reception unit 203, the determination unit 204, the determination unit 203, and the communication control unit 204 of the NW device 20 are realized by a control program stored in the memory 1002 and operating on the processor 1001. May be. Although the above-described various processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.

The memory 1002 is a computer-readable recording medium, and includes, for example, at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), and the like. May be. The memory 1002 may be called a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, and the like that can be executed to perform the processing according to the embodiment of the present invention.

The storage 1003 is a computer-readable recording medium such as an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, a Blu-ray). (Registered trademark) disk, smart card, flash memory (for example, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like. The storage 1003 may be referred to as an auxiliary storage device. The storage medium described above may be, for example, a database, server, or other suitable medium including the memory 1002 and / or the storage 1003.

The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like. For example, the signal transmission unit 101 and the signal reception unit 102 of the UE may be realized by the communication device 1004. Further, the signal transmission unit 201 and the signal reception unit 202 of the NW device 20 may be realized by the communication device 1004.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

Also, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured with a single bus or may be configured with different buses between apparatuses.

The UE and NW device include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA). A part or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented by at least one of these hardware.

(Summary)
As described above, according to the present embodiment, a user apparatus that supports D2D, which transmits a connection request for D2D connection between the user apparatus and another user apparatus to a network apparatus. And a receiving unit that receives connection parameters for the D2D connection from the network device, and a control unit that establishes the D2D connection using the connection parameters. .

The above configuration makes it possible to establish a D2D connection using appropriate connection parameters between user apparatuses.

The connection request includes, for example, identification information of the other user device acquired from the discovery signal received by the receiving unit. With this configuration, the network device can appropriately specify the user device of the communication partner.

The receiving unit may receive a connection parameter for D2D connection from the network device by monitoring a predetermined search space when a paging message including a predetermined flag is received from the network device. . With this configuration, for example, even when the user apparatus is in an idle state, connection parameters can be received without transitioning to a connected state.

Further, according to the present embodiment, a network apparatus that communicates with a user apparatus that supports D2D, and receives a connection request for D2D connection between the user apparatus and another user apparatus from the user apparatus. A determining unit that determines a connection parameter for the D2D connection based on capability information of the user device and capability information of the other user device, and a connection parameter determined by the determining unit. A network device is provided, comprising: a transmission unit that transmits to the user device and transmits the connection parameter determined by the determination unit to the other user device.

The determination unit determines whether to permit the D2D connection based on the capability information of the user device and the capability information of the other user device, and when the D2D connection is permitted, The connection parameters for connection may be determined. With this configuration, it is possible to appropriately determine whether to permit D2D connection based on the capability information.

<Supplement of embodiment>
The notification of information is not limited to the aspect / embodiment described in the present specification, and may be performed by other methods. For example, information notification includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (for example, RRC signaling, MAC signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block))), other signals, or a combination thereof. Further, the RRC message may be referred to as RRC signaling. The RRC message may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.

Each aspect / embodiment described in this specification includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA. (Registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-WideBand), The present invention may be applied to a Bluetooth (registered trademark), a system using another appropriate system, and / or a next generation system extended based on the system.

The input / output information or the like may be stored in a specific location (for example, a memory) or may be managed by a management table. Input / output information and the like can be overwritten, updated, or additionally written. The output information or the like may be deleted. The input information or the like may be transmitted to another device.

The determination or determination may be performed by a value represented by 1 bit (0 or 1), may be performed by a true value (Boolean: true or false), or may be performed by comparing numerical values (for example, (Comparison with a predetermined value).

The information, signals, etc. described herein may be represented using any of a variety of different technologies. For example, data, commands, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these May be represented by a combination of

Note that the terms described in this specification and / or terms necessary for understanding this specification may be replaced with terms having the same or similar meaning. For example, the channel and / or symbol may be a signal. The signal may be a message.

UE is a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal by those skilled in the art , Remote terminal, handset, user agent, mobile client, client, or some other appropriate terminology.

The processing procedures, sequences, etc. of each aspect / embodiment described in this specification may be switched in order as long as there is no contradiction. For example, the methods described herein present the elements of the various steps in an exemplary order and are not limited to the specific order presented.

Each aspect / embodiment described in this specification may be used alone, in combination, or may be switched according to execution. In addition, notification of predetermined information (for example, notification of being “X”) is not limited to explicitly performed, but is performed implicitly (for example, notification of the predetermined information is not performed). Also good.

As used herein, the terms “determining” and “determining” may encompass a wide variety of actions. “Judgment”, “decision” can be, for example, calculating, computing, processing, deriving, investigating, looking up (eg, table, database or another (Searching in the data structure), and confirming (ascertaining) what has been confirmed may be considered as “determining” or “determining”. In addition, “determination” and “determination” include receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. (accessing) (e.g., accessing data in a memory) may be considered as "determined" or "determined". In addition, “determination” and “decision” means that “resolving”, “selecting”, “choosing”, “establishing”, and “comparing” are regarded as “determining” and “deciding”. May be included. In other words, “determination” and “determination” may include considering some operation as “determination” and “determination”.

As used herein, the phrase “based on” does not mean “based only on”, unless expressly specified otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”

Although the present invention has been described in detail above, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

This patent application claims priority based on Japanese Patent Application No. 2016-109548 filed on May 31, 2016, the entire contents of Japanese Patent Application No. 2016-109548 are incorporated herein by reference. To do.

UE user apparatus eNB base station 101 signal transmission unit 102 signal reception unit 103 determination unit 104 communication control unit 201 signal transmission unit 202 signal reception unit 203 determination unit 204 communication control unit 1001 processor 1002 memory 1003 storage 1004 communication device 1005 input device 1006 output apparatus

Claims

A user device that supports D2D,
A transmission unit for transmitting a connection request for D2D connection between the user device and another user device to a network device;
A receiving unit for receiving connection parameters for the D2D connection from the network device;
And a control unit that establishes the D2D connection using the connection parameter.
The user apparatus according to claim 1, wherein the connection request includes identification information of the other user apparatus acquired from a discovery signal received by the receiving unit.
The receiving unit receives a connection parameter for D2D connection from the network device by monitoring a predetermined search space when a paging message including a predetermined flag is received from the network device. The user device according to claim 1 or 2.
A network device that communicates with a user device that supports D2D,
A receiving unit that receives a connection request for D2D connection between the user device and another user device from the user device;
A determination unit that determines connection parameters for the D2D connection based on the capability information of the user device and the capability information of the other user device;
A network device comprising: a transmission unit that transmits the connection parameter determined by the determination unit to the user device and transmits the connection parameter determined by the determination unit to the other user device.
The determination unit determines whether to permit the D2D connection based on the capability information of the user device and the capability information of the other user device, and when the D2D connection is permitted, The network device according to claim 4, wherein a connection parameter for connection is determined.