JP2015179957A - Base station device, terminal device, communication method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce intersymbol interference upon cellular communication caused by terminal-to-terminal communication.SOLUTION: A radio communication system 100 includes: a plurality of terminal devices; a base station device 30 which performs radio communication with each of the plurality of terminal devices by a predetermined cellular system; and a server which controls the terminal-to-terminal communication of at least two terminal devices, using at least a part of frequency bands among the frequency bands for use in the cellular system. The base station device 30 manages timing advance information sets for each terminal device, to cause each target terminal device of the terminal-to-terminal communication to acquire one timing advance information set among the timing advance information sets.

Description

  The present invention relates to a control technique for a wireless communication system.

  In recent years, in E-UTRAN (Evolved Universal Terrestrial Radio Access Network), a plurality of terminal devices (User Equipment, hereinafter referred to as UE) is a technology for performing direct communication without going through a base station (terminal communication). Device to Device Communication (hereinafter referred to as D2D communication) is being discussed.

  D2D communication is performed using a frequency band common to the frequency band used for the uplink of cellular communication such as LTE. It is said that the distance between terminal devices to which D2D communication can be applied is about several hundred meters. By performing D2D communication between terminal devices in such an environment, it is expected to reduce the degree of congestion in cellular communication in a specific environment such as an emergency (for example, non- (See Patent Document 1).

3gpp TR36.843 Ver. 1.2.0

  However, depending on the state of the terminal device that is the target of D2D communication, intersymbol interference may be given to cellular communication.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a base station device, a terminal device, a communication method, and a program that can reduce intersymbol interference with respect to cellular communication even when inter-terminal communication is performed. It is to provide.

  One embodiment of the present invention relates to a base station apparatus. The base station apparatus includes a plurality of terminal apparatuses, a base station apparatus that performs radio communication with each of the plurality of terminal apparatuses using a predetermined cellular system, and at least a part of a frequency band used in the cellular system. A base station apparatus in a wireless communication system including a server that controls communication between terminals of at least two terminal apparatuses using a frequency band. Further, the base station apparatus acquires any one of the timing advance information managed by the control unit that manages the timing advance information for each terminal apparatus and the timing advance information managed by the control unit to the terminal apparatus that is the target of inter-terminal communication. A communication unit.

  According to such an aspect, by causing the terminal device subject to inter-terminal communication to acquire Timing Advance information, it is possible to correct a communication frame shift between the terminal device subject to inter-terminal communication and the base station device. Even if inter-terminal communication is performed, inter-symbol interference with respect to cellular communication can be reduced.

  Another aspect of the present invention relates to a terminal device. The terminal device includes a plurality of terminal devices, a base station device that performs radio communication with each of the plurality of terminal devices by a predetermined cellular method, and at least a part of frequencies in a frequency band used in the cellular method And a server that controls communication between terminals of at least two terminal devices using a band. One terminal device for inter-terminal communication in a wireless communication system. The terminal device is a request signal for starting inter-terminal communication with the base station device using the Timing Advance information with the other terminal device for inter-terminal communication. Communication that transmits a request signal for causing a device to acquire Timing Advance information, and that receives a signal from the base station device that is a response signal to the request signal and includes authentication information related to the counterpart terminal device And a storage unit that stores authentication information included in the response signal. Here, a control part produces | generates the control signal regarding the said communication between terminals using the said authentication information. Further, the communication unit synchronizes with the counterpart terminal device by transmitting a control signal generated by the control unit to the counterpart terminal device, and acquires the Timing Advance information. Inter-terminal communication with

  According to such an aspect, by transmitting a control signal to the partner terminal device, the terminal device synchronizes with the partner terminal device, and the terminal device with the partner terminal device that has acquired Timing Advance information. By performing communication, even if inter-terminal communication is performed, inter-symbol interference with respect to cellular communication can be reduced.

  Another aspect of the present invention relates to a terminal device. The terminal device includes a plurality of terminal devices, a base station device that performs radio communication with each of the plurality of terminal devices by a predetermined cellular method, and at least a part of frequencies in a frequency band used in the cellular method And a server that controls communication between terminals of at least two terminal devices using a band. One terminal device for inter-terminal communication in a wireless communication system. In addition, the terminal device receives a threshold value for determining the start of inter-terminal communication from the server via the base station, and controls inter-terminal communication from the terminal device of the other end of the inter-terminal communication. A communication unit that receives the signal, and a control unit that measures reception quality of the control signal received by the communication unit. Here, the control unit compares the threshold value received by the communication unit with the reception quality measured by the control unit, and determines whether or not to start the inter-terminal communication. In addition, when the control unit determines to start communication between terminals, the communication unit acquires Timing Advance information from the base station apparatus, and performs communication between terminals with the counterpart terminal apparatus.

  According to such an aspect, when it is determined to start inter-terminal communication, inter-terminal communication is performed by obtaining Timing Advance information from the base station apparatus and performing inter-terminal communication with the counterpart terminal apparatus. Even so, intersymbol interference with cellular communication can be reduced.

  It should be noted that any combination of the above-described constituent elements and a representation of the present invention converted between a method, an apparatus, a system, a computer program, etc. are also effective as an aspect of the present invention.

  According to the present invention, intersymbol interference with respect to cellular communication can be reduced.

(Outline of the present invention)
Before describing the embodiments of the present invention, an outline of the present invention will be described first. The present invention relates to a technology of D2D communication in which terminal devices directly communicate with each other. The D2D communication according to the present invention uses at least a part of the frequency bands used in the cellular communication in common, and is a method for determining the transmission timing of the UE that is performing the D2D communication. . According to the present invention, it is possible to reduce intersymbol interference between cellular communication and D2D communication in an environment where both UEs in the RRC_idle state and UEs in the RRC_Connected state coexist.

  In general, a UE in cellular communication normally offsets transmission timing in consideration of propagation delay between eNB and UE in uplink communication with a base station apparatus (evolved NodeB, hereinafter referred to as eNB). This is called Timing Advance (hereinafter also referred to as TA). By taking TA into account, the shift of the communication frame between the eNB and the UE is corrected, and intersymbol interference can be reduced.

  Here, also in the D2D communication performed in the same frequency band as the cellular communication, it is necessary to consider TA in order to reduce intersymbol interference with the cellular communication frame. However, this TA cannot be considered unless the UE transitions to the RRC_Connected state. For this reason, when considering both UEs in the RRC_idle state and UEs in the RRC_Connected state as the target UEs of the D2D communication, TA cannot be considered in the UE in the RRC_idle state, and between the cellular communication and the D2D communication. In this case, there is a possibility that intersymbol interference occurs.

  The present invention solves the above problems and provides a method for a UE in the RRC_idle state to consider TA, thereby reducing intersymbol interference between cellular communication and D2D communication.

(Configuration example of wireless communication system according to an embodiment of the present invention)
Here, a configuration example of the wireless communication system according to the embodiment of the present invention will be described. FIG. 1 is a diagram illustrating a configuration example of a wireless communication system 100 according to an embodiment of the present invention. The wireless communication system 100 includes a first terminal device 10, a second terminal device 20, a base station device 30, and a server device 40.

  The server device 40 is also called ProximityServiceServer. The server device 40 controls D2D communication in cooperation with the MME device that manages the location registration of the terminal device. The first terminal device 10 and the second terminal device 20 are wireless terminals that perform cellular communication with the base station device 30. Moreover, the 1st terminal device 10 and the 2nd terminal device 20 are terminals which can perform D2D communication. In the following description, it is assumed that the first terminal apparatus 10 is in the RRC_Connected state and the second terminal apparatus 20 is in the RRC_idle state.

  In UEs in the RRC_idle state, only limited functions such as paging channel monitoring, ETWS (Earthquake and Tsunami Warning System) information reception, neighbor cell quality measurement, cell selection / reselection, and system information acquisition are available. It is in a state that does not consume as much power as possible.

  In the UE in the RRC_Connected state, functions such as data transmission / reception and feedback of information such as CQI (Channel Quality Indicator) to the eNB can be executed in addition to the processing in the RRC_idle state. From the RRC_idle state to the RRC_Connected state, a state transition occurs by receiving the paging channel.

(Configuration example of terminal device)
FIG. 2 is a diagram illustrating a configuration example of the terminal device of FIG. The terminal device includes a UE communication unit 12, a UE control unit 14, a UE storage unit 16, and a user IF 18.

  The UE communication unit 12 executes a wireless communication process with the base station device 30. The UE communication unit 12 performs D2D communication processing with a terminal device that is a partner of D2D communication. For these communication processes, known modulation / demodulation techniques and antenna techniques may be used. The UE storage unit 16 stores data transmitted from the base station device 30 or the counterpart terminal device of D2D communication, and should be transmitted to the base station device 30 or the counterpart terminal device of D2D communication. Data obtained through the user IF 18 may be stored. The user IF 18 may include a screen interface, an input interface that receives input from a user such as a keyboard and a touch panel, and an image capturing unit such as a camera.

  Below, the 1st terminal device 10 of a RRC_Connected state and the 2nd terminal device 20 of a RRC_idle state are divided, and each functional block is demonstrated.

(1) In the case of the 1st terminal device 10 The structure and operation | movement of the 1st terminal device 10 of a RRC_Connected state are demonstrated using FIG. The UE communication unit 12 transmits, to the base station device 30, a request signal for starting D2D communication that is performed using Timing Advance information with the second terminal device 20 that is the counterpart of D2D communication. This request signal may include information for specifying the second terminal device 20 of the other party, such as IMSI and telephone number information. Alternatively, identification information about a predetermined service may be included in the request signal. As a result, a terminal device that designates a predetermined service can be designated as a partner of D2D communication. In addition, this request signal is also a signal serving as a trigger for a series of processing for acquiring the Timing Advance information after the base station device 30 makes the second terminal device 20 transition to the RRC_Connected state later.

  Further, the UE communication unit 12 receives a response signal for the request signal from the base station device 30. This response signal may include authentication information related to the second terminal device 20 of the other party of the D2D communication. The UE storage unit 16 may store the authentication information included in the response signal for each terminal device. The UE control unit 14 may generate a control signal related to the D2D communication (hereinafter referred to as a D2D signal) using the authentication information stored in the UE storage unit 16. The authentication information may include an identification number of the second terminal device 20 that is the counterpart of the D2D communication, and information for identifying a service designated by the second terminal device 20.

  In addition, the UE communication unit 12 synchronizes with the second terminal device 20 of the other party by transmitting the control signal generated by the UE control unit 14 to the second terminal device 20 of the other party, and the Timing Advance information You may implement D2D communication between the acquired 2nd terminal devices 20 of the other party.

(2) In the case of the 2nd terminal device 20 The structure and operation | movement of the 2nd terminal device 20 of a RRC_idle state are demonstrated using FIG.

  The UE communication unit 12 receives a signal for making a transition from the RRC_idle state to the RRC_Connected state from the base station device 30. This signal may be a paging message. The UE communication unit 12 acquires Timing Advance information by performing an initial access procedure such as a random access process with the base station device 30 after transitioning to the RRC_Connected state. The UE communication unit 12 may receive the D2D signal from the first terminal device 10 of the other party of the D2D communication before and after the acquisition of Timing Advance information.

  The UE communication unit 12 may receive information on the threshold value from the base station device 30. In this case, the UE control unit 14 measures the reception quality of the D2D signal received by the UE communication unit 12. The UE control unit 14 may determine whether to start D2D communication by comparing the threshold value received by the UE communication unit 12 with the measured reception quality. Note that the UE control unit 14 measures the reception quality of the control signal received in the predetermined period at least once, and when each of the measurement results of the predetermined number of times exceeds the threshold value, the terminal The start of intercommunication may be determined. When the UE control unit 14 determines the start of D2D communication, timing advance information may be acquired from the base station device 30 to perform inter-terminal communication with the counterpart first terminal device 10.

(Configuration example of base station device 30)
FIG. 3 is a diagram illustrating a configuration example of the base station apparatus 30 of FIG. Base station apparatus 30 includes a base station communication unit 32, a base station control unit 34, and a base station storage unit 36.

  The base station communication unit 32 uses the information stored in the base station storage unit 36 by the base station control unit 34 while using each of the first terminal device 10 and the second terminal device 20 and a predetermined cellular method. Perform cellular wireless communication. When the 1st terminal device 10 and the 2nd terminal device 20 implement D2D communication, the base station communication part 32 and the base station control part 34 perform the following processes.

  First, the base station communication unit 32 receives a request signal for starting D2D communication from a terminal device. The base station communication unit 32 inquires of the server device 40 using information for specifying one terminal device of D2D communication included in the request signal. As a response to this inquiry, the base station communication unit 32 receives, from the server device 40, location registration information about one second terminal device 20 in D2D communication, authentication information in D2D communication, and the like. The base station communication unit 32 transmits a signal including authentication information regarding the second terminal device 20 acquired from the server device 40 to the first terminal device 10.

  Further, the base station control unit 34 specifies the second terminal device 20 based on the information received from the server device 40. Here, the base station communication unit 32 transmits a signal for making a transition to the RRC_Connected state to the second terminal device 20 specified by the base station control unit 34. Further, the base station communication unit 32 causes the second terminal device 20 that has transitioned to the RRC_Connected state to acquire Timing Advance information, thereby causing the second terminal device 20 to start inter-terminal communication with the first terminal device 10. Let The base station communication unit 32 may cause the second terminal apparatus 20 to acquire Timing Advance information after the second terminal apparatus 20 acquires the D2D signal.

  The base station control unit 34 manages Timing Advance information for each terminal device using the base station storage unit 36. Any one of the timing advance information managed by the base station control unit 34 may be acquired by the terminal device that is the target of the inter-terminal communication. The base station communication unit 32 may transmit the minimum Timing Advance value among the Timing Advance values generated within a predetermined period in the base station control unit 34.

  The base station communication unit 32 may acquire a threshold value for determining the start of inter-terminal communication from the server device 40. Further, the base station communication unit 32 causes the second terminal device 20 of one of the terminal-to-terminal communication to acquire the acquired threshold value, and the second terminal device 20 determines the start of the terminal-to-terminal communication using the threshold value. In such a case, the terminal device may be caused to acquire Timing Advance information.

  Moreover, the base station communication part 32 may transmit a threshold value using a dedicated channel, when the 2nd terminal device 20 is a RRC_Connected state. Further, the base station communication unit 32 may acquire the second terminal apparatus 20 in the RRC_idle state by transmitting a threshold value using a broadcast channel.

(Configuration example of server device 40)
FIG. 4 is a diagram illustrating a configuration example of the server device 40 of FIG. Server device 40 includes a server communication unit 42, a server control unit 44, and a server storage unit 46. The server communication unit 42 notifies the base station device 30 of information related to a terminal device for handling D2D communication in cooperation with the MME. The server storage unit 46 stores information related to the terminal device. The server control unit 44 controls the server communication unit 42 and the like using the information stored in the server storage unit 46.

  Examples of the present invention will be specifically described below using Examples 1 to 5.

  First, Example 1 will be described. Here, description will be made with reference to FIGS. In addition, about the structure and operation | movement already mentioned, the description is simplified by using the same code | symbol. The same applies hereinafter.

  FIG. 5 is a diagram illustrating a configuration example of the first wireless communication system 110 according to the first embodiment of the present invention. FIG. 6 is a sequence diagram illustrating an operation example of the first wireless communication system 110 in FIG. Example 1 is an example about the case where a 2nd terminal device is changed to a RRC_Connected state by transmitting a paging message to the 2nd terminal device 20 in a RRC_idle state via the base station apparatus 30. In the following, the sequence of the first embodiment will be described while associating (1) to (7) shown in FIG. 5 with S10 to S22 shown in FIG.

  (1) First, the first terminal apparatus 10 that wants to start D2D communication sends a D2D Communication Request message including D2D attribute information about the second terminal apparatus 20 that is the other party that wants to start D2D communication to the base station apparatus 30 that is the connection destination. It transmits to (S10). The D2D attribute information may include the IMSI or telephone number information of the second terminal device 20.

(2) The base station apparatus 30 transmits a UE information request to inquire the server apparatus 40 about a terminal apparatus having the corresponding D2D attribute information (S12).
(3) Here, the server device 40 identifies a terminal device corresponding to the transmitted D2D attribute information, and transmits information on the identified second terminal device 20 to the base station device 30 as UE information notification (S14).
(4) Thereafter, the base station apparatus 30 transmits a D2D Communication Request Ack to the first terminal apparatus 10 (S16). This message may include information related to the second terminal device 20 such as authentication information for D2D communication.
(5) The base station apparatus 30 performs D2D Communication Paging processing on the identified second terminal apparatus 20 (S18).
(6) The 2nd terminal device 20 which received this Paging changes to a RRC_Connected state, and performs the initial access procedure for acquiring TA value with respect to the base station apparatus 30 (S20).
(7) After the second terminal device 20 acquires the TA, D2D communication is performed with the first terminal device 10 in consideration of the TA (S22).

  According to the aspect as described above, the TA can be efficiently acquired by transmitting the paging message to the second terminal device 20 in the RRC_idle state to cause the second terminal device 20 to transition to the RRC_Connected state. . Therefore, inter-symbol interference with cellular communication can be reduced in subsequent D2D communication with the first terminal apparatus 10.

  Next, Example 2 will be described. Here, description will be made with reference to FIGS. FIG. 7 is a diagram illustrating a configuration example of the second wireless communication system 120 according to the second embodiment of the present invention. FIG. 8 is a sequence diagram showing an operation example of the second wireless communication system 120 in FIG.

  The second embodiment is a modification of the first embodiment, and is an example of a case where the second terminal apparatus 20 acquires a TA after receiving a D2D signal from the first terminal apparatus. In the following, the sequence of the second embodiment will be described while associating (1) to (8) shown in FIG. 7 with S30 to S44 shown in FIG.

  Since (1) to (5) are the same processes as in the first embodiment, the description thereof is omitted. Moreover, since S30 to S38 are the same processes as S10 to S18, the description thereof is omitted.

  (6) The first terminal apparatus 10 transmits a D2D signal to the second terminal apparatus 20 (S40). Here, the D2D signal may be a D2D terminal detection signal, a synchronization signal for D2D communication, or the D2D Communication Request Ack received from the base station apparatus 30 in (5). You may produce | generate using the information regarding the 2nd terminal device 20 contained. Note that the process of S40 may be in the reverse order of the D2D Communication Paging of S38.

(7) Here, the 2nd terminal device 20 which received D2D signal and Paging changes to a RRC_Connected state, and performs the initial access procedure for acquiring TA value to base station device 30 (S42).
(8) After the second terminal apparatus 20 acquires the TA, D2D communication is performed with the first terminal apparatus 10 in consideration of the TA (S44).

  According to the above aspect, the second terminal apparatus 20 can only acquire the necessary TA by acquiring the TA after receiving the D2D signal from the first terminal apparatus 10. This is because when the TA is acquired before acquiring the D2D signal, if there is no D2D communication from the first terminal apparatus 10, the acquisition of the TA is wasted.

  Next, Example 3 will be described. Here, description will be made with reference to FIGS. 9 and 10. FIG. 9 is a diagram illustrating a configuration example of the third wireless communication system 130 according to the third embodiment of the present invention. FIG. 10 is a sequence diagram showing an operation example of the third wireless communication system 130 of FIG.

  Example 3 is an example about the case where the 2nd terminal device 20 determines whether D2D communication is implemented based on the threshold value notified from the base station apparatus 30. FIG. In the following, the sequence of the third embodiment will be described while associating (1) to (5) shown in FIG. 9 with S50 to S60 shown in FIG.

  In this sequence, it is assumed that the second terminal device 20 preselects a service that the terminal device is interested in and registers it in the server device 40 via the base station device 30. The correspondence relationship between the D2D signal and the service may be information regarding the correspondence relationship between the predetermined identification information included in the D2D signal and the service identification information. In this state, the first terminal device 10 notifies the server device 40 of a request for D2D communication to the terminal device that is performing the predetermined service, via the base station device 30, and registers the notified service. The second terminal device 20 may be specified.

  (1) First, the server apparatus 40 notifies the correspondence relationship between the D2D signal and the service to the base station apparatus 30 (S50).

  (2) Next, the base station device 30 notifies the second terminal device 20 of the correspondence between the D2D UE Activate threshold and the service based on the correspondence received from the server device 40 (S52). ). This notification may be notified by a broadcast signal. In addition, the second terminal device 20 may be set in advance. The correspondence relationship between the D2D UE Activate threshold value and the service is information on a plurality of services registered in the server device 40 by the second terminal device 20 and information on threshold values set for each service. Also good.

  (3) The second terminal device 20 receives the D2D signal from the first terminal device 10 (S54). Here, when the second terminal apparatus 20 determines that the received D2D signal is related to a service registered in advance in the server apparatus 40, the second terminal apparatus 20 measures the quality of the received D2D signal and activates the D2D UE activation threshold. By comparing with the value, it is determined whether or not to start the D2D communication (S56). Note that the measured quality may be information regarding received power such as RSRP and RSRQ.

  The D2D signal may be an orthogonal sequence such as a Zadoff-chu sequence, or may be a signal that transmits arbitrary bit string data. Further, it may be associated with a service, for example, a predetermined sequence may be generated using an identification number for identifying the service. Note that it may be determined whether or not to start D2D communication using a value obtained by adding a predetermined value α to the threshold value instead of the notified threshold value. Alternatively, the quality of the D2D signal received in a predetermined period is measured at least once, and when each of the measurement results equal to or greater than the predetermined number exceeds the threshold, the start of D2D communication is determined. Also good.

(4) Here, the second terminal apparatus 20 determined to start the D2D communication transitions to the RRC_Connected state, and performs an initial access procedure for acquiring the TA value with respect to the base station apparatus 30 (S58).
(5) After the second terminal apparatus 20 acquires the TA, D2D communication is performed with the first terminal apparatus 10 in consideration of the TA (S60).

  According to the above aspect, more comfortable D2D communication can be executed by executing D2D communication with a communication terminal that has transmitted a D2D signal that is equal to or greater than a predetermined threshold. Thereby, useless D2D communication can be avoided and interference with cellular communication can be reduced.

  Next, Example 4 will be described. Here, it demonstrates using FIG. FIG. 11 is a diagram illustrating a configuration example of the fourth wireless communication system 140 according to the fourth embodiment of the present invention.

  The fourth embodiment is an example of a case where the TA setting value is notified from the base station device 30 to the second terminal device 20 in the RRC_idle state by a broadcast signal. Below, the sequence of Example 4 is demonstrated along (1)-(2) shown in FIG.

(1) The base station apparatus 30 causes the first terminal apparatus 10 and the second terminal apparatus 20 to acquire the TA value set for D2D communication by including the TA value in the broadcast signal.
(2) The first terminal apparatus 10 and the second terminal apparatus 20 that have acquired the TA value start D2D communication after synchronizing with each other using the D2D signal according to the procedure described in the previous embodiment.

  The TA value notified by the broadcast information may be selected from the TA values set in the terminal devices in the cell of the base station device 30. The selected TA value may be, for example, a minimum TA value or an average value of a plurality of TA values.

  According to the above aspect, by broadcasting the TA value directly from the base station device 30, the sequence for obtaining the TA value as shown in the first to third embodiments is not necessary, and thus efficient D2D communication. Can be realized.

(Modification of Examples 1-4)
Next, Example 5 will be described. The fifth embodiment is a modification of the first to fourth embodiments. In the first to fourth embodiments, the TA value is notified from the base station device 30, but in the fifth embodiment, the terminal device itself obtains the TA value by calculation.

  First, the terminal device acquires PRS (Positioning Reference Signal) transmitted from a plurality of base station devices 30 and base station position information notified by Paging or Tracking Area Update. Next, the terminal apparatus estimates the distance from the base station apparatus 30 from the reception results of a plurality of PRSs and / or the acquired base station position information. Finally, the terminal device calculates a propagation delay based on the estimated distance and sets it as a TA value. It should be readily understood by those skilled in the art that distance estimation and propagation delay calculation can be performed by known techniques.

  According to the above aspect, since it is not necessary to receive an explicit TA value from the base station apparatus, the sequence up to the start of D2D communication can be made efficient.

  In the above, this invention was demonstrated based on the Example. The present invention is not limited to the above-described embodiments and the contents of each embodiment, and various modifications can be made within the scope of the gist of the present invention. The above-mentioned embodiment is an exemplification, and various modifications can be made to the combination of each component and each processing process by combining each embodiment, and such a modification is also within the scope of the present invention. Will be understood by those skilled in the art.

It is a figure which shows the structural example of the radio | wireless communications system concerning embodiment of this invention. It is a figure which shows the structural example of the terminal device of FIG. It is a figure which shows the structural example of the base station apparatus of FIG. It is a figure which shows the structural example of the server apparatus of FIG. It is a figure which shows the structural example of the 1st radio | wireless communications system concerning Example 1 of this invention. FIG. 6 is a sequence diagram illustrating an operation example of the first wireless communication system in FIG. 5. It is a figure which shows the structural example of the 2nd radio | wireless communications system concerning Example 2 of this invention. FIG. 9 is a sequence diagram illustrating an operation example of the second wireless communication system in FIG. 7. It is a figure which shows the structural example of the 3rd radio | wireless communications system concerning Example 3 of this invention. FIG. 10 is a sequence diagram showing an operation example of the third wireless communication system in FIG. 9. It is a figure which shows the structural example of the 4th radio | wireless communications system concerning Example 4 of this invention.

  DESCRIPTION OF SYMBOLS 10 1st terminal device, 12 UE communication part, 14 UE control part, 16 UE memory | storage part, 18 User IF, 20 2nd terminal device, 30 Base station apparatus, 32 Base station communication part, 34 Base station control part, 36 Base Station storage unit, 40 server device, 42 server communication unit, 44 server control unit, 46 server storage unit, 100 wireless communication system, 110 first wireless communication system, 120 second wireless communication system, 130 third wireless communication system, 140 Fourth wireless communication system.

Claims (13)

A plurality of terminal apparatuses, a base station apparatus that performs wireless communication with each of the plurality of terminal apparatuses by a predetermined cellular system, and at least a frequency band using at least a part of frequency bands used in the cellular system A base station device in a wireless communication system comprising a server for controlling communication between terminals of two terminal devices,
A control unit that manages Timing Advance information for each terminal device;
A communication unit that causes a terminal device that is a target of inter-terminal communication to acquire any one of the Timing Advance information managed by the control unit;
A base station apparatus comprising: The communication unit transmits a signal for switching to the RRC_Connected state to terminal devices in the RRC_idle state among the target terminal devices for inter-terminal communication, and thereafter acquires Timing Advance information to the terminal device that has transitioned to the RRC_Connected state. The base station apparatus according to claim 1, wherein: The communication unit is a request signal for starting inter-terminal communication using the Timing Advance information from the first terminal apparatus in the RRC_Connected state among the plurality of terminal apparatuses to the second terminal apparatus in the RRC_idle state. And receiving a request signal including information on the second terminal device,
The control unit identifies the second terminal device by inquiring the server using information included in the request signal received by the communication unit,
The communication unit transmits a signal for changing to the RRC_Connected state to the second terminal device specified by the control unit, and then acquires Timing Advance information to the second terminal device changed to the RRC_Connected state. The base station apparatus according to claim 1, wherein the second terminal apparatus causes the second terminal apparatus to start inter-terminal communication with the first terminal apparatus. The base station apparatus according to claim 3, wherein the communication unit causes the second terminal apparatus to acquire Timing Advance information after the second terminal apparatus acquires a control signal related to the inter-terminal communication. . After the communication unit receives a response to the inquiry from the server device, the communication unit is a response signal for the request signal to the first terminal device, and a signal including authentication information about the second terminal device The base station apparatus according to claim 3 or 4, wherein the second terminal apparatus receives a control signal related to communication between the terminals including authentication information from the first terminal apparatus by transmitting . The communication unit acquires a threshold value for determining the start of inter-terminal communication from the server, causes the terminal device for inter-terminal communication to acquire the acquired threshold value, and the terminal device for inter-terminal communication The base station apparatus according to any one of claims 3 to 5, wherein when the start of inter-terminal communication is determined using a threshold, the terminal apparatus is caused to acquire Timing Advance information. The communication unit transmits a threshold value using a dedicated channel to a terminal device in the RRC_Connected state and transmits a threshold value using a broadcast channel to the terminal device in the RRC_idle state. The base station apparatus according to claim 6. The base station apparatus according to claim 1, wherein the communication unit transmits a minimum Timing Advance value among Timing Advance values generated within a predetermined period in the control unit. A plurality of terminal apparatuses, a base station apparatus that performs wireless communication with each of the plurality of terminal apparatuses by a predetermined cellular system, and at least a frequency band using at least a part of frequency bands used in the cellular system A server for controlling communication between terminals of two terminal devices, and one terminal device for communication between terminals in a wireless communication system comprising:
This is a request signal for starting inter-terminal communication using the Timing Advance information with the other terminal device for inter-terminal communication to the base station device, and obtains Timing Advance information to the other terminal device. A communication unit that transmits a request signal for causing the base station device to receive a signal that is a response signal to the request signal and includes authentication information about the counterpart terminal device;
A storage unit for storing authentication information included in the response signal;
With
The control unit generates a control signal related to the inter-terminal communication using the authentication information,
The communication unit synchronizes with the counterpart terminal device by transmitting the control signal generated by the control unit to the counterpart terminal device, and the counterpart terminal device that has acquired Timing Advance information. A terminal device that performs inter-terminal communication between the terminals. A plurality of terminal apparatuses, a base station apparatus that performs wireless communication with each of the plurality of terminal apparatuses by a predetermined cellular system, and at least a frequency band using at least a part of frequency bands used in the cellular system A server for controlling communication between terminals of two terminal devices, and one terminal device for communication between terminals in a wireless communication system comprising:
A communication unit that receives a threshold for determining start of inter-terminal communication from the server via the base station, and receives a control signal related to inter-terminal communication from a terminal device of the other party of inter-terminal communication When,
A control unit for measuring the reception quality of the control signal received by the communication unit;
With
The control unit compares the threshold value received by the communication unit with the reception quality measured by the control unit, determines whether to start the inter-terminal communication,
The communication unit obtains Timing Advance information from the base station device when the control unit determines to start communication between terminals, and performs communication between terminals with a counterpart terminal device. Terminal device. The control unit measures the reception quality of the control signal received in a predetermined period at least once, and when each of the measurement results equal to or greater than the predetermined number exceeds the threshold, communication between terminals is performed. The terminal device according to claim 10, wherein a start is determined. A plurality of terminal apparatuses, a base station apparatus that performs wireless communication with each of the plurality of terminal apparatuses by a predetermined cellular system, and at least a frequency band using at least a part of frequency bands used in the cellular system A communication method in a wireless communication system comprising a server for controlling communication between terminals of two terminal devices,
Managing Timing Advance information for each terminal device;
A step of causing a terminal device subject to inter-terminal communication to acquire any one of the managed Timing Advance information;
Including a communication method. A plurality of terminal apparatuses, a base station apparatus that performs wireless communication with each of the plurality of terminal apparatuses by a predetermined cellular system, and at least a frequency band using at least a part of frequency bands used in the cellular system A program in a wireless communication system comprising a server for controlling communication between terminals of two terminal devices,
Managing Timing Advance information for each terminal device;
A step of causing a terminal device subject to inter-terminal communication to acquire any one of the managed Timing Advance information;
A program that causes a computer to execute.

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