JP2015035713A - Radio base station device, radio terminal device, radio communication system, inter-terminal direct communication control method, and computer program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a terminal on the reception side to determine whether a communication partner is a base station or another terminal, when the other terminal performs synchronous processing and the like between the terminals instead of the base station in inter-terminal direct communication by the terminals present outside a communicable zone of the base station.SOLUTION: A radio communication system in which terminals 2 can communicate with each other through a base station 1 arranges a number used for an inter-terminal direct communication cell identifier for identifying a terminal 2 performing inter-terminal direct communication in addition to a number capable of being used for a cell identifier for identifying the base station 1. The base station 1 stores information on the inter-terminal direct communication cell identifier, and transmits the information on the inter-terminal direct communication cell identifier to the terminal 2. The terminal 2 receives the information on the inter-terminal direct communication cell identifier from the base station 1 and stores the information, and executes processing of the inter-terminal direct communication when a cell identifier received from a communication partner corresponds to the inter-terminal direct communication cell identifier shown by the information on the inter-terminal direct communication cell identifier.

Description

  The present invention relates to a radio base station apparatus, a radio terminal apparatus, a radio communication system, a direct communication control method between terminals, and a computer program

  In recent years, a technique for performing direct communication (direct communication between terminals) between terminals in a cellular system capable of communication between terminals via a base station has been studied. For example, in a successor system of LTE (Long Term Evolution) called LTE Advanced (LTE-Advanced), which is being standardized by 3GPP (3rd Generation Partnership Project), direct communication between terminals is being considered (for example, Non-patent document 1). As direct communication between terminals, a case where a terminal located within a communicable range of a base station is performed and a case where a terminal located outside the communicable range of the base station is performed are considered.

3GPP, Study on LTE Device to Device Proximity Services, RP122009, Internet <URL: http://www.3gpp.org> 3GPP, TS36.304, v11.4.0, Jun. 2013 3GPP, TS36.300, v11.6.0, Jun. 2013

  In direct communication between terminals by terminals outside the communicable area of the base station, since the signaling from the base station cannot be received, it is necessary for the terminal to perform synchronization processing between terminals instead of the base station. At this time, there is a problem that the receiving terminal cannot distinguish whether the currently communicating partner is a base station or a terminal.

  The present invention has been made in consideration of such circumstances, and in a direct communication between terminals by a terminal outside the communicable area of the base station, the terminal performs a synchronization process between the terminals instead of the base station. In this case, it is an object to be able to distinguish whether a receiving terminal is a base station or a terminal as a communication partner.

(1) A radio base station apparatus according to the present invention uses a cell identifier for identifying the radio base station apparatus in the radio base station apparatus of a radio communication system capable of communicating between radio terminal apparatuses via the radio base station apparatus. A number used for the inter-terminal direct communication cell identifier for identifying a wireless terminal device that performs direct communication between terminals, which is direct communication between wireless terminal devices, is provided for the available number, and the inter-terminal direct communication cell A cell identifier information storage unit for storing identifier information, and a radio unit for transmitting information on the inter-terminal direct communication cell identifier to a radio terminal device are provided.

(2) In the radio base station apparatus according to the present invention, in the radio base station apparatus of (1), the inter-terminal direct communication cell identifier is a number that can be used as a cell identifier for identifying the radio base station apparatus. The number is an undefined number.

(3) In the radio base station apparatus according to the present invention, in the radio base station apparatus of (1), the inter-terminal direct communication cell identifier is a number that can be used as a cell identifier for identifying the radio base station apparatus. Among these numbers, the numbers are partly redefined as cell identifiers for direct communication between terminals.

(4) A wireless terminal device according to the present invention is a direct communication between terminals which is a direct communication between wireless terminal devices in the wireless terminal device of a wireless communication system capable of communicating between wireless terminal devices via a wireless base station device. A wireless unit that receives information on a cell identifier for direct communication between terminals that identifies a wireless terminal device that performs communication from the wireless base station device and receives a cell identifier from a communication partner, and direct communication between terminals received by the wireless unit A terminal-to-terminal direct communication information storage unit that stores information on cell identifiers for use, and a cell identifier received by the wireless unit indicated by the information on the cell identifier for direct communication between terminals stored in the terminal-to-terminal direct communication information storage unit. And an inter-terminal direct communication control unit that executes the inter-terminal direct communication process when the inter-terminal direct communication cell identifier is met.

(5) The radio terminal apparatus according to the present invention can be used as a cell identifier for identifying the radio base station apparatus in the radio terminal apparatus of the radio communication system capable of communicating between the radio terminal apparatuses via the radio base station apparatus. Wireless numbers that are used as cell identifiers for direct communication between terminals for identifying wireless terminal devices that perform direct communication between terminals, which are direct communication between wireless terminal devices, and that receive cell identifiers from a communication partner A terminal-to-terminal direct communication information storage unit that stores information on the cell identifier for direct communication between terminals, and a cell-to-terminal direct communication information storage unit that stores the cell identifier received by the radio unit An inter-terminal direct communication control unit that executes the inter-terminal direct communication process when it corresponds to the inter-terminal direct communication cell identifier indicated by the communication cell identifier information. To.

(6) In the wireless terminal device according to the present invention, in the wireless terminal device according to (4) or (5), the inter-terminal direct communication control unit is configured such that the own wireless terminal device is connected to the wireless base station device. When the cell identifier received by the radio unit does not correspond to the cell identifier for direct communication between terminals indicated by the information of the cell identifier for direct communication between terminals stored in the direct communication information storage unit between terminals The synchronization processing with the radio base station apparatus is started.

(7) In the wireless terminal device according to the present invention, in the wireless terminal device according to (6), the inter-terminal direct communication control unit performs synchronization processing with the wireless base station device, and then performs direct communication between the terminals. A synchronization process with a communication partner is started.

(8) In the wireless terminal device according to the present invention, in the wireless terminal device according to (7), the inter-terminal direct communication control unit starts the synchronization process with the wireless base station device in advance. It is characterized by notifying the other party of direct communication.

(9) In the wireless terminal device according to the present invention, in the wireless terminal device according to any one of (4) to (8), when the own wireless terminal device is within a communicable range of the wireless base station device, When the cell identifier received by the radio unit does not correspond to the cell identifier for direct communication between terminals indicated by the information of the cell identifier for direct communication between terminals stored in the direct communication information storage unit between terminals, cell selection A process or a handover process is started.

(10) A radio communication system according to the present invention includes the radio base station apparatus (1) and the radio terminal apparatus (4).

(11) A radio base station apparatus according to the present invention is a radio base station apparatus for a broadcast signal in the radio base station apparatus of a radio communication system capable of communicating between radio terminal apparatuses via the radio base station apparatus. Provided with a portion for storing information for identifying whether there is a wireless terminal device that performs direct communication between terminals, or a wireless unit that transmits the broadcast signal storing information indicating that it is a wireless base station device It is characterized by that.

(12) Whether the wireless terminal device according to the present invention is a wireless base station device for a broadcast signal in the wireless terminal device of the wireless communication system capable of communicating between wireless terminal devices via the wireless base station device. Alternatively, a wireless unit that includes a part that stores information for identifying whether the terminal is a wireless terminal device that performs direct communication between terminals, and that transmits the broadcast signal that stores information indicating that the wireless terminal device performs direct communication between terminals. It is provided with.

(13) An inter-terminal direct communication control method according to the present invention is an inter-terminal direct communication control method in the radio base station apparatus of a radio communication system capable of communicating between radio terminal apparatuses via a radio base station apparatus, Used as a cell identifier for direct communication between terminals for identifying a wireless terminal device that performs direct communication between terminals, which is direct communication between wireless terminal devices, for a number that can be used as a cell identifier that identifies the wireless base station device And a step in which the radio base station apparatus stores information on the cell identifier for direct communication between terminals in a cell identifier information storage unit, and the information on the cell identifier for direct communication between terminals is provided by the radio base station apparatus. Transmitting to the wireless terminal device.

(14) The direct communication control method between terminals according to the present invention is a direct communication control method between terminals in the wireless terminal device of a wireless communication system capable of communicating between wireless terminal devices via a wireless base station device, A step in which a radio terminal device receives information on a cell identifier for direct communication between terminals for identifying a radio terminal device that performs direct communication between terminals, which is direct communication between wireless terminal devices, from the radio base station device; and A device storing the received inter-terminal direct communication cell identifier information in an inter-terminal direct communication information storage unit; a wireless terminal device receiving a cell identifier from a communication partner; and the wireless terminal A device identifies the cell identifier for direct communication between terminals indicated by the information of the cell identifier for direct communication between terminals stored in the inter-terminal direct communication information storage unit. If true, it characterized in that it comprises the steps of: executing processing of the inter-terminal direct communication.

(15) A direct communication control method between terminals according to the present invention is a direct communication control method between terminals in the wireless terminal device of the wireless communication system capable of communicating between wireless terminal devices via a wireless base station device, A number used as a cell identifier for direct communication between terminals for identifying a wireless terminal device that performs direct communication between terminals, which is direct communication between wireless terminal devices, with respect to a number that can be used as a cell identifier for identifying a wireless base station device The wireless terminal device stores information on the inter-terminal direct communication cell identifier in the inter-terminal direct communication information storage unit, and the wireless terminal device receives a cell identifier from a communication partner; The wireless terminal device has a cell-to-terminal direct communication cell in which the received cell identifier is indicated by information on a cell identifier for inter-terminal direct communication stored in the inter-terminal direct communication information storage unit. If applicable to the identifier, characterized in that it comprises the steps of: executing processing of the inter-terminal direct communication.

(16) A computer program according to the present invention is a computer program for performing inter-terminal direct communication control processing in the radio base station apparatus of the radio communication system capable of communicating between radio terminal apparatuses via the radio base station apparatus. Thus, for the number that can be used as a cell identifier for identifying the wireless base station device, a cell identifier for direct communication between terminals for identifying a wireless terminal device that performs direct communication between terminals that is direct communication between wireless terminal devices. Providing a number to be used, storing information on the cell identifier for direct communication between terminals in a cell identifier information storage unit, and transmitting information on the cell identifier for direct communication between terminals to a wireless terminal device; It is a computer program for making it run.

(17) A computer program according to the present invention is a computer program for performing inter-terminal direct communication control processing in the wireless terminal device of a wireless communication system capable of communicating between wireless terminal devices via a wireless base station device. Receiving, from the radio base station apparatus, information on a cell identifier for direct communication between terminals that identifies a wireless terminal apparatus that performs direct communication between terminals, which is direct communication between wireless terminal apparatuses; and the received direct communication between terminals Storing the information of the cell identifier for communication in the inter-terminal direct communication information storage unit, receiving the cell identifier from the communication partner, and storing the received cell identifier in the inter-terminal direct communication information storage unit When the inter-terminal direct communication cell identifier indicated by the inter-terminal direct communication cell identifier information is met, the inter-terminal direct communication processing is performed. Characterized in that it is a computer program for executing the steps of the row, to the computer.

(18) A computer program according to the present invention is a computer program for performing inter-terminal direct communication control processing in the wireless terminal device of a wireless communication system capable of communicating between wireless terminal devices via a wireless base station device. , Used as a cell identifier for direct communication between terminals for identifying a wireless terminal device that performs direct communication between terminals, which is direct communication between wireless terminal devices, for a number that can be used as a cell identifier for identifying the wireless base station device Storing the information of the inter-terminal direct communication cell identifier in the inter-terminal direct communication information storage unit, receiving the cell identifier from the communication partner, and receiving the cell identifier between the terminals. When it corresponds to the cell identifier for direct communication between terminals indicated by the information of the cell identifier for direct communication between terminals stored in the direct communication information storage unit, Characterized in that it is a computer program for executing a step of executing a process of communication between the serial terminals directly to the computer.

  According to the present invention, in a direct communication between terminals by a terminal outside the communicable area of the base station, when the terminal performs a synchronization process between the terminals instead of the base station, the receiving terminal determines the communication partner. There is an effect that it is possible to distinguish between a base station and a terminal.

It is a schematic block diagram for demonstrating the structure of the radio | wireless communications system which concerns on one Embodiment of this invention. It is a block diagram which shows the structure of the base station 1 which concerns on one Embodiment of this invention. It is a block diagram which shows the structure of the terminal 2 which concerns on one Embodiment of this invention. It is a graph which shows the example of the cell identifier for direct communication between terminals which concerns on one Embodiment of this invention (PCI for D2D communication). It is a sequence chart for demonstrating the direct communication control process between terminals which concerns on one Embodiment of this invention. It is a flowchart which shows the direct communication control process between terminals of the terminal 2 which concerns on one Embodiment of this invention. It is a flowchart which shows the other terminal direct communication control processing of the terminal 2 which concerns on one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, direct communication between terminals may be referred to as D2D communication.
FIG. 1 is a schematic configuration diagram for explaining a configuration of a wireless communication system according to an embodiment of the present invention. The wireless communication system according to the present embodiment can communicate between wireless terminal devices (hereinafter referred to as terminals) via wireless base station devices (hereinafter referred to as base stations). Examples of the wireless communication system according to the present embodiment include a cellular system.

  FIG. 1 shows a base station 1 and a terminal 2-1s on the transmission side and a terminal 2-1r on the reception side that perform direct inter-terminal communication within the communicable area with the base station 1. In addition, a transmitting terminal 2-2s and a receiving terminal 2-2r that perform direct inter-terminal communication outside the communicable area with the base station 1 are illustrated. Hereinafter, the terminals 2-1s, 2-1r, 2-2s, and 2-2r are referred to as “terminal 2” unless otherwise distinguished.

  In FIG. 1, a terminal 2 within the communicable range of the base station 1 can directly send and receive data to and from the base station 1. On the other hand, the terminal 2 outside the communicable area of the base station 1 cannot directly send and receive data to and from the base station 1. The terminal 2 that is outside the communicable area of the base station 1 can receive a signal transmitted from the terminal 2 that is within the communicable area of the base station 1. Further, the terminal 2 located within the communicable area of the base station 1 can receive a signal transmitted from the terminal 2 located outside the communicable area of the base station 1.

  FIG. 2 is a block diagram illustrating a configuration of the base station 1 according to the present embodiment. FIG. 3 is a block diagram illustrating a configuration of the terminal 2 according to the present embodiment. 2 and 3 show only the configuration related to direct communication between terminals.

  In FIG. 2, the base station 1 includes a radio unit 10, an inter-terminal direct communication control unit 11, and a PCI information storage unit 12. The wireless unit 10 performs wireless communication with the terminal 2 that is within its communicable range. The inter-terminal direct communication control unit 11 controls inter-terminal direct communication.

  The PCI information storage unit 12 stores information on the inter-terminal direct communication cell identifier. The inter-terminal direct communication cell identifier is information for identifying the terminal 2 that performs direct inter-terminal communication. The terminal 2 that performs direct communication between terminals transmits the cell identifier for direct communication between terminals to the partner of direct communication between terminals. The terminal 2 that has received the inter-terminal direct communication cell identifier recognizes that the communication partner that has transmitted the inter-terminal direct communication cell identifier is the terminal.

  Examples 1 and 2 of cell identifiers for direct communication between terminals are listed below. In these examples 1 and 2, the inter-terminal direct communication cell identifier for identifying the terminal 2 that performs direct inter-terminal communication with respect to a number that can be used for a cell identifier (Physical Cell Identity: PCI) that identifies the base station 1 The number used for is provided.

(Example 1 of inter-terminal direct communication cell identifier) An undefined number in the PCI is used as the inter-terminal direct communication cell identifier. FIG. 4 is a chart showing an example of the inter-terminal direct communication cell identifier (D2D communication PCI) according to the present embodiment. FIG. 4 shows an example of a PCI for D2D communication when applied to an LTE standard wireless communication system (LTE system). In the LTE system, numbers from 0 to 503 are defined as PCIs for identifying base stations. For this reason, an undefined number 504 or more is defined as a cell identifier for direct communication between terminals. Further, in the example of FIG. 4, the inter-terminal direct communication cell identifier is defined for each use.

(Example 2 of inter-terminal direct communication cell identifier) A part of the PCI identifying the base station 1 is used as the inter-terminal direct communication cell identifier. For example, in the LTE system, numbers from 0 to 503 have been defined as PCIs for identifying base stations, but some of the numbers from 0 to 503 are redefined as cell identifiers for direct communication between terminals. .

  In addition, Example 1 and Example 2 of the above-described inter-terminal direct communication cell identifier may be used singly or may be used in combination.

  The PCI information storage unit 12 stores D2D communication PCI information (D2D communication PCI information). The PCI information for D2D communication is information for determining the PCI for D2D communication. As an example of the PCI information for D2D communication, there is information indicating a range of numbers that can be taken by the PCI for D2D communication. An example of PCI information for D2D communication related to the PCI for D2D communication in FIG. 4 is shown below.

Max_PCI_for_PS: Maximum value of PCI for D2D communication for public safety.
Min_PCI_for_PS: Minimum value of PCI for D2D communication for public safety.
Max_PCI_for_VV: Maximum value of PCI for D2D communication for telematics.
Min_PCI_for_VV: Minimum value of D2D communication PCI for telematics.
Max_PCI_for_CS: Maximum value of general-purpose PCI for D2D communication.
Min_PCI_for_CS: The minimum value of PCI for general use D2D communication.

  In FIG. 3, the terminal 2 includes a radio unit 20, an inter-terminal direct communication control unit 21, and an inter-terminal direct communication information storage unit 22. The radio unit 20 performs radio communication with the base station 1. In addition, the wireless unit 20 performs wireless communication with a partner of direct communication between terminals. The radio unit 20 receives a signal transmitted from the terminal 2 outside the communicable area of the base station 1 when the terminal 2 is within the communicable area of the base station 1, A signal directed to the terminal 2 outside the communicable area is transmitted. In addition, when the own terminal 2 is outside the communicable area of the base station 1, the radio unit 20 receives a signal transmitted from the terminal 2 that is within the communicable area of the base station 1.

  The inter-terminal direct communication control unit 21 controls inter-terminal direct communication. The inter-terminal direct communication information storage unit 22 stores information related to inter-terminal direct communication. The inter-terminal direct communication information storage unit 22 stores PCI information for D2D communication as one piece of information related to direct inter-terminal communication.

  The inter-terminal direct communication control unit 21 transmits the PCI for D2D communication to the partner of the direct inter-terminal communication when the own terminal 2 is outside the communicable area of the base station 1. As a method for selecting the PCI for D2D communication to be transmitted, a method for randomly selecting from among available PCIs for D2D communication, or selecting a different one from the PCI for D2D communication used for D2D communication in the vicinity is selected. And so on. The available PCI for D2D communication is indicated by the PCI information for D2D communication stored in the inter-terminal direct communication information storage unit 22.

  The terminal 2 outside the communicable area of the base station 1 recognizes that the communication partner is the terminal 2 by receiving the PCI for D2D communication from the partner of the direct communication between terminals. Thereby, in the direct communication between terminals by the terminal 2 outside the communicable area of the base station 1, when the terminal 2 performs a synchronization process between the terminals instead of the base station 1, the receiving terminal 2 communicates. Whether the partner is the base station 1 or the terminal 2 can be distinguished.

  Next, operations of the base station 1 and the terminal 2 according to the present embodiment will be described with reference to FIG. 5, FIG. 6, and FIG.

First, the operation of the base station 1 will be described with reference to FIG. FIG. 5 is a sequence chart for explaining the inter-terminal direct communication control process according to the present embodiment.
(Step S100) The base station 1 notifies the terminal 2 of PCI information for D2D communication stored in the PCI information storage unit 12.

(Step S <b> 101) Upon receiving the D2D communication PCI information notification from the base station 1, the terminal 2 stores the D2D communication PCI information in the inter-terminal direct communication information storage unit 22. Thus, the terminal 2 can determine the D2D communication PCI based on the D2D communication PCI information.

  In addition, as a partner to which the base station 1 notifies PCI information for D2D communication, for example, there is a terminal 2 that receives a “Discovery” function of D2D communication.

  In the example of FIG. 5, the D2D communication PCI information is notified from the base station 1 to the terminal 2, but the D2D communication PCI information is previously transmitted to the terminal 2 (for example, at the manufacturing stage or the sales stage of the terminal). You may make it set.

  Next, the operation of the terminal 2 will be described with reference to FIG. FIG. 6 is a flowchart showing the inter-terminal direct communication control process of the terminal 2 according to the present embodiment.

When the terminal 2 is not connected to the base station 1, the terminal 2 executes the direct communication control process between terminals in FIG.
(Step S11) The inter-terminal direct communication control unit 21 determines whether or not the PCI received from the communication partner by the wireless unit 20 is a PCI for D2D communication. In this determination, when the PCI received from the communication partner corresponds to the D2D communication PCI indicated by the D2D communication PCI information stored in the interterminal direct communication information storage unit 22, It is determined that the received PCI is a PCI for D2D communication. As a result, if it is a PCI for D2D communication, the process proceeds to step S12. If it is not a PCI for D2D communication, the process proceeds to step S13.

(Step S12) Since the PCI received from the communication partner is the D2D communication PCI, the inter-terminal direct communication control unit 21 recognizes that the communication partner is the terminal 2. Thereby, the inter-terminal direct communication control unit 21 executes a process of D2D communication with the terminal 2 that is the communication partner.

(Step S13) The inter-terminal direct communication control unit 21 recognizes that the communication partner is the base station 1 because the PCI received from the communication partner is not the D2D communication PCI. Thereby, the inter-terminal direct communication control unit 21 notifies the terminal 2 that is the partner of the D2D communication that the synchronization process with the base station 1 is started.

(Step S14) The inter-terminal direct communication control unit 21 starts a synchronization process with the received base station 1 having a PCI.

(Step S15) When the synchronization process with the base station 1 started in Step S14 is completed, the inter-terminal direct communication control unit 21 executes the synchronization process with the terminal 2 that is the partner of the D2D communication.

  Next, the operation of the terminal 2 will be described with reference to FIG. FIG. 7 is a flowchart showing another inter-terminal direct communication control process of the terminal 2 according to the present embodiment.

When the terminal 2 is within the communicable range of the base station 1, the terminal 2 executes the inter-terminal direct communication control process of FIG.
(Step S21) The inter-terminal direct communication control unit 21 determines whether or not the PCI received from the communication partner by the wireless unit 20 is a PCI for D2D communication. This determination is similar to step S11 in FIG. As a result, if it is a PCI for D2D communication, the process proceeds to step S22. If it is not a PCI for D2D communication, the process proceeds to step S23.

(Step S22) Since the PCI received from the communication partner is the PCI for D2D communication, the inter-terminal direct communication control unit 21 recognizes that the communication partner is the terminal 2. Thereby, the inter-terminal direct communication control unit 21 executes a process of D2D communication with the terminal 2 that is the communication partner.

(Step S <b> 23) The inter-terminal direct communication control unit 21 recognizes that the communication partner is the base station 1 because the PCI received from the communication partner is not the PCI for D2D communication. As a result, the terminal 2 executes a cell selection process or a handover process. The cell selection process and the handover process are processes in a conventional cellular system. The cell selection process is described in Non-Patent Document 2, for example. The handover process is described in Non-Patent Document 3, for example.

  When the terminal 2 on the receiving side of D2D communication receives a PCI for identifying the base station 1 (for example, PCI having a number from 0 to 503 in the LTE system), in order to synchronize with the base station 1 The alert may be transmitted to the terminal 2 on the transmission side of the D2D communication.

  In addition, when the terminal 2 on the transmission side of D2D communication receives a PCI for identifying the base station 1 (for example, a PCI having a number from 0 to 503 in the LTE system), the terminal 2 on the transmission side re-synchronizes with the base station 1. May be. Thereby, it is aimed to prevent radio wave interference.

  Further, when the terminal 2 is outside the communicable area of the base station 1 and cannot receive the PCI information for D2D communication from the base station 1, and the use of each D2D communication PCI (see FIG. 4) is not known, the terminal 2 The received signal of the communication PCI (for example, PCI having a number of 504 or more in the LTE system) may be determined as a broadcast signal or a multicast signal from the terminal 2 that performs D2D communication. As a result, it is not necessary to transmit the service type of D2D communication using the Discovery signal, so that an effect of reducing the amount of signaling can be obtained.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the specific structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

  For example, in the wireless communication system shown in FIG. 1, a portion for storing information for distinguishing whether the broadcast signal is the base station 1 or the terminal 2 that performs direct communication between terminals is provided. The base station 1 includes a wireless unit that transmits a broadcast signal storing information indicating that the base station 1 is the base station 1. On the other hand, the terminal 2 includes a wireless unit that transmits a broadcast signal storing information indicating that the terminal 2 is a terminal 2 that performs direct communication between terminals. Thereby, the terminal 2 that has received the broadcast signal can distinguish whether the other party that has transmitted the broadcast signal is the base station 1 or the terminal 2.

  As information indicating that the terminal 2 performs direct inter-terminal communication, C-RNTI information assigned to the terminal 2 most recently can be used. Alternatively, the QoS information of the direct communication between terminals can be used as information indicating that the terminal 2 performs direct communication between terminals. Note that the terminal 2 that does not perform direct communication between terminals does not add the information to the broadcast signal. That is, the terminal 2 that is not performing direct communication between terminals empties a portion that stores information for identifying whether the broadcast signal is the base station 1 or the terminal 2 that performs direct communication between terminals.

  The present invention can be applied to a wireless communication system such as a cellular system. For example, the present invention may be applied to an LTE standard wireless communication system (LTE system), an LTE advanced standard wireless communication system (LTE advanced system), and the like.

  Further, a computer program for realizing the base station 1 or the terminal 2 described above is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed. Good. Here, the “computer system” may include an OS and hardware such as peripheral devices.

  “Computer-readable recording medium” means a flexible disk, a magneto-optical disk, a ROM, a writable nonvolatile memory such as a flash memory, a portable medium such as a DVD (Digital Versatile Disk), and a built-in computer system. A storage device such as a hard disk.

Further, the “computer-readable recording medium” means a volatile memory (for example, DRAM (Dynamic DRAM) in a computer system that becomes a server or a client when a program is transmitted through a network such as the Internet or a communication line such as a telephone line. Random Access Memory)), etc., which hold programs for a certain period of time.
The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

DESCRIPTION OF SYMBOLS 1 ... Base station (radio base station apparatus), 2 ... Terminal (wireless terminal apparatus), 10 ... Radio | wireless part, 11 ... Direct communication control part between terminals, 12 ... PCI information storage part, 20 ... Radio | wireless part, 21 ... Between terminals Direct communication control unit, 22 ... Direct communication information storage unit between terminals

Claims (18)

In the wireless base station device of the wireless communication system capable of communicating between wireless terminal devices via the wireless base station device,
Used as a cell identifier for direct communication between terminals for identifying a wireless terminal device that performs direct communication between terminals, which is direct communication between wireless terminal devices, for a number that can be used as a cell identifier that identifies the wireless base station device Provide a number,
A cell identifier information storage unit for storing information of the cell identifier for direct communication between terminals;
A wireless unit that transmits information of the cell identifier for direct communication between terminals to a wireless terminal device;
A radio base station apparatus comprising:   The radio base station apparatus according to claim 1, wherein the inter-terminal direct communication cell identifier is an undefined number among numbers usable as a cell identifier for identifying the radio base station apparatus.   The inter-terminal direct communication cell identifier is a part of a number re-defined as the inter-terminal direct communication cell identifier among the numbers usable as a cell identifier for identifying the radio base station device. The radio base station apparatus according to claim 1, wherein: In the wireless terminal device of the wireless communication system capable of communicating between wireless terminal devices via a wireless base station device,
A radio unit that receives information on a cell identifier for direct communication between terminals that identifies a wireless terminal device that performs direct communication between terminals, which is direct communication between wireless terminal devices, from the wireless base station device and receives a cell identifier from a communication partner When,
A terminal-to-terminal direct communication information storage unit that stores information on a cell identifier for terminal-to-terminal direct communication received by the wireless unit;
When the cell identifier received by the radio unit corresponds to the cell identifier for direct communication between terminals indicated by the information of the cell identifier for direct communication between terminals stored in the direct communication information storage unit between terminals, the inter-terminal An inter-terminal direct communication control unit that executes direct communication processing;
A wireless terminal device comprising: In the wireless terminal device of the wireless communication system capable of communicating between wireless terminal devices via a wireless base station device,
Used as a cell identifier for direct communication between terminals for identifying a wireless terminal device that performs direct communication between terminals, which is direct communication between wireless terminal devices, for a number that can be used as a cell identifier that identifies the wireless base station device Provide a number,
A wireless unit that receives a cell identifier from a communication partner;
An inter-terminal direct communication information storage unit for storing information on the inter-terminal direct communication cell identifier;
When the cell identifier received by the radio unit corresponds to the cell identifier for direct communication between terminals indicated by the information of the cell identifier for direct communication between terminals stored in the direct communication information storage unit between terminals, the inter-terminal An inter-terminal direct communication control unit that executes direct communication processing;
A wireless terminal device comprising:   The inter-terminal direct communication control unit is a terminal in which a cell identifier received by the radio unit is stored in the inter-terminal direct communication information storage unit when the own radio terminal device is not connected to the radio base station device. The radio according to claim 4 or 5, wherein synchronization processing with the radio base station apparatus is started when it does not correspond to the cell identifier for direct communication between terminals indicated by the information of the cell identifier for direct direct communication. Terminal device.   The wireless terminal according to claim 6, wherein the inter-terminal direct communication control unit starts the synchronization process with the partner of the direct communication between terminals after executing the synchronization process with the radio base station apparatus. apparatus.   The radio terminal apparatus according to claim 7, wherein the inter-terminal direct communication control unit notifies the counterpart of the inter-terminal direct communication in advance that synchronization processing with the radio base station apparatus is started.   When the own wireless terminal device is within the communicable range of the wireless base station device, the cell identifier received by the wireless unit is a cell identifier for direct communication between terminals stored in the direct communication information storage unit between terminals. The radio terminal apparatus according to any one of claims 4 to 8, wherein a cell selection process or a handover process is started when it does not correspond to the cell identifier for direct communication between terminals indicated by the information.   A radio communication system comprising the radio base station apparatus according to claim 1 and the radio terminal apparatus according to claim 4. In the wireless base station device of the wireless communication system capable of communicating between wireless terminal devices via the wireless base station device,
Provide a part for storing information for distinguishing whether it is a radio base station apparatus or a radio terminal apparatus that performs direct communication between terminals for the broadcast signal,
A radio base station apparatus comprising a radio unit that transmits the broadcast signal storing information indicating that the radio base station apparatus is a radio base station apparatus. In the wireless terminal device of the wireless communication system capable of communicating between wireless terminal devices via a wireless base station device,
Provide a part for storing information for distinguishing whether it is a radio base station apparatus or a radio terminal apparatus that performs direct communication between terminals for the broadcast signal,
A wireless terminal device comprising: a wireless unit that transmits the broadcast signal storing information indicating that the wireless terminal device performs direct communication between terminals. A direct communication control method between terminals in the wireless base station device of the wireless communication system capable of communicating between wireless terminal devices via a wireless base station device,
Used as a cell identifier for direct communication between terminals for identifying a wireless terminal device that performs direct communication between terminals, which is direct communication between wireless terminal devices, for a number that can be used as a cell identifier that identifies the wireless base station device Provide a number,
The wireless base station device stores information of the cell identifier for direct communication between terminals in a cell identifier information storage unit;
The wireless base station device transmitting information of the inter-terminal direct communication cell identifier to the wireless terminal device;
A terminal-to-terminal direct communication control method comprising: A direct communication control method between terminals in the wireless terminal device of the wireless communication system capable of communicating between wireless terminal devices via a wireless base station device,
The wireless terminal device receiving from the wireless base station device information of an inter-terminal direct communication cell identifier for identifying a wireless terminal device that performs direct communication between terminals, which is direct communication between wireless terminal devices;
The wireless terminal device storing the received inter-terminal direct communication cell identifier information in the inter-terminal direct communication information storage unit;
The wireless terminal device receiving a cell identifier from a communication partner;
When the wireless terminal device corresponds to the cell identifier for direct communication between terminals indicated by the information of the cell identifier for direct communication between terminals stored in the inter-terminal direct communication information storage unit, the received cell identifier, Performing the process of direct communication between the terminals;
A terminal-to-terminal direct communication control method comprising: A direct communication control method between terminals in the wireless terminal device of the wireless communication system capable of communicating between wireless terminal devices via a wireless base station device,
Used as a cell identifier for direct communication between terminals for identifying a wireless terminal device that performs direct communication between terminals, which is direct communication between wireless terminal devices, for a number that can be used as a cell identifier that identifies the wireless base station device Provide a number,
The wireless terminal device storing the inter-terminal direct communication cell identifier information in the inter-terminal direct communication information storage unit;
The wireless terminal device receiving a cell identifier from a communication partner;
When the wireless terminal device corresponds to the cell identifier for direct communication between terminals indicated by the information of the cell identifier for direct communication between terminals stored in the inter-terminal direct communication information storage unit, the received cell identifier, Performing the process of direct communication between the terminals;
A terminal-to-terminal direct communication control method comprising: A computer program for performing direct communication control processing between terminals in the wireless base station device of a wireless communication system capable of communicating between wireless terminal devices via a wireless base station device,
Used as a cell identifier for direct communication between terminals for identifying a wireless terminal device that performs direct communication between terminals, which is direct communication between wireless terminal devices, for a number that can be used as a cell identifier that identifies the wireless base station device Provide a number,
Storing the cell identifier information for direct communication between terminals in a cell identifier information storage unit;
Transmitting information on the cell identifier for direct communication between terminals to a wireless terminal device;
A computer program for causing a computer to execute. A computer program for performing direct communication control processing between terminals in the wireless terminal device of a wireless communication system capable of communicating between wireless terminal devices via a wireless base station device,
Receiving, from the radio base station device, information on a cell identifier for direct communication between terminals that identifies a wireless terminal device that performs direct communication between terminals, which is direct communication between wireless terminal devices;
Storing the received inter-terminal direct communication cell identifier information in the inter-terminal direct communication information storage unit;
Receiving a cell identifier from a communication partner;
When the received cell identifier corresponds to the inter-terminal direct communication cell identifier indicated by the inter-terminal direct communication cell identifier information stored in the inter-terminal direct communication information storage unit, the direct communication between terminals is performed. Executing the process;
A computer program for causing a computer to execute. A computer program for performing direct communication control processing between terminals in the wireless terminal device of a wireless communication system capable of communicating between wireless terminal devices via a wireless base station device,
Used as a cell identifier for direct communication between terminals for identifying a wireless terminal device that performs direct communication between terminals, which is direct communication between wireless terminal devices, for a number that can be used as a cell identifier that identifies the wireless base station device Provide a number,
Storing the inter-terminal direct communication cell identifier information in the inter-terminal direct communication information storage unit;
Receiving a cell identifier from a communication partner;
When the received cell identifier corresponds to the inter-terminal direct communication cell identifier indicated by the inter-terminal direct communication cell identifier information stored in the inter-terminal direct communication information storage unit, the direct communication between terminals is performed. Executing the process;
A computer program for causing a computer to execute.

Images