WO2015020356A1 - 단말 간 직접 통신에서 버퍼상태보고 전송 방법 및 그 장치 - Google Patents
단말 간 직접 통신에서 버퍼상태보고 전송 방법 및 그 장치 Download PDFInfo
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- WO2015020356A1 WO2015020356A1 PCT/KR2014/007081 KR2014007081W WO2015020356A1 WO 2015020356 A1 WO2015020356 A1 WO 2015020356A1 KR 2014007081 W KR2014007081 W KR 2014007081W WO 2015020356 A1 WO2015020356 A1 WO 2015020356A1
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- terminal
- terminals
- direct communication
- information
- base station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0278—Traffic management, e.g. flow control or congestion control using buffer status reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
Definitions
- the present invention relates to a direct communication method between terminals and an apparatus thereof, and to efficiently allocate radio resources used for direct communication between terminals, and to transmit a direct communication state between terminals to a base station, wherein the first terminal communicates with the second terminal.
- the terminal can directly transmit or receive data or signals between terminals without going through a network infrastructure such as a base station or an access point. Direct communication is emerging.
- LTE Long Term Evolution
- LTE-Advanced networks etc.
- LTE Long Term Evolution
- LTE-Advanced network a technology for efficiently supporting direct communication between terminals using radio resources of a mobile communication network such as an existing communication network, for example, Long Term Evolution (LTE) or LTE-Advanced network, has not been developed. .
- LTE Long Term Evolution
- LTE-Advanced network a technology for efficiently supporting direct communication between terminals using radio resources of a mobile communication network such as an existing communication network, for example, Long Term Evolution (LTE) or LTE-Advanced network
- a base station recognizes accurate information related to direct communication between terminals and distributes radio resources based on this. It is necessary to decide.
- the base station needs to correctly recognize buffer information used for direct communication between terminals.
- a procedure for allocating radio resources of a mobile communication network that can be used for direct communication between terminals is required in order to perform direct communication between terminals using radio resources of the mobile communication network.
- the base station or the radio resource allocation entity capable of allocating radio resources needs to acquire information on the amount of data for direct communication between terminals in order to efficiently allocate radio resources for direct communication between terminals.
- a specific procedure of transmitting a buffer status report is required for a terminal to receive radio resources that can be used for direct communication between terminals to a base station.
- the base station or the entity allocating radio resources allocates radio resources for direct communication between terminals, it is necessary to obtain information on whether the allocated radio resources are used for efficient radio resource allocation or distribution.
- the base station needs to receive information related to the direct communication between the terminals in its coverage.
- the present invention provides a buffer status report (BSR) for direct communication between terminals with a second terminal in a method in which the first terminal performs direct communication between the second terminal and the terminal. Triggering and transmitting a buffer status report to a base station or a radio resource allocation entity, and receiving radio resource allocation information for direct communication between terminals with a second terminal from the base station or radio resource allocation entity.
- BSR buffer status report
- the buffer status report may include: when the first terminal initiates direct communication between the terminals, when direct communication between the terminals is initiated, from the second terminal to perform direct communication between the first terminal and the terminal; When a resource request is received, when data for direct communication between terminals having a higher priority enters a buffer, when data for direct communication between terminals enters a buffer, direct communication between the terminals is performed in the buffer.
- the present invention provides a method that is triggered when at least one of a case in which data exists for a retransmission timer expires and a timer for transmitting the buffer status report expires.
- the radio resource allocation entity may perform at least one of a radio resource allocation for direct communication between terminals with the second terminal, a sink channel transmission, and a function of managing a terminal group for performing direct communication between the terminals. To provide.
- the buffer status report provides a method including a logical channel identifier index value for direct communication between terminals, which is distinguished from a logical channel identity index value for communication with the base station.
- the buffer status report provides a method comprising a direct communication connection identifier index value between terminals for distinguishing at least one direct communication between terminals.
- the buffer status report includes buffer status information on a logical channel for communication with the base station and a logical channel for direct communication between the terminals, wherein the logical channel for direct communication between the terminals communicates with the base station. It provides a method to be assigned to a logical channel group (Logical Channel Group) that is distinct from the logical channel for the purpose.
- a logical channel group Logical Channel Group
- the present invention also provides a method for controlling a direct communication between terminals by a base station, when a buffer status report (BSR) of a first terminal for direct communication between terminals is triggered, the buffer status report is reported from the first terminal. It provides a method comprising the step of transmitting and the radio resource allocation information for direct communication between terminals based on the receiving and the buffer status report.
- BSR buffer status report
- the buffer status report may include: when the first terminal initiates direct communication between the terminals, when direct communication between the terminals is started, the radio resource from the second terminal to perform direct communication between the first terminal and the terminal.
- the radio resource from the second terminal to perform direct communication between the first terminal and the terminal.
- the buffer status report provides a method including a logical channel identifier index value for direct communication between terminals, which is distinguished from a logical channel identity index value for communication with the base station.
- the buffer status report provides a method comprising a direct communication connection identifier index value between terminals for distinguishing at least one direct communication between terminals.
- the buffer status report includes buffer status information on a logical channel for communication with the base station and a logical channel for direct communication between the terminals, wherein the logical channel for direct communication between the terminals communicates with the base station. It provides a method to be assigned to a logical channel group (Logical Channel Group) that is distinct from the logical channel for the purpose.
- a logical channel group Logical Channel Group
- the method Prior to receiving the buffer status report, the method further comprises assigning a logical channel for direct communication between the terminals to a logical channel group that is distinct from the logical channel for communication with the base station.
- the present invention provides a first terminal performing direct communication between the second terminal and the terminal, the control unit and the buffer status triggered the buffer status report (Buffer Status Report, BSR) for direct communication between the terminal and the second terminal
- a terminal apparatus including a transmitter for transmitting a report to a base station or a radio resource allocation entity and a receiver for receiving radio resource allocation information for direct communication between terminals with a second terminal from the base station or radio resource allocation entity.
- the buffer status report may include: when the first terminal initiates direct communication between the second terminal and the terminal, when direct communication between the terminals is initiated, the second terminal to perform direct communication between the first terminal and the terminal; When the radio resource request is received from a terminal, when data for direct communication between terminals having a higher priority enters a buffer, and when data for direct communication between terminals enters a buffer, the terminal enters the buffer.
- a terminal that is triggered when there is at least one of when there is data for direct communication between the retransmission timer and the timer for transmitting the buffer status report has expired.
- the radio resource allocation entity may perform at least one of a radio resource allocation for direct communication between terminals with the second terminal, a sink channel transmission, and a function of managing a terminal group for performing direct communication between the terminals. It provides a terminal characterized by.
- the buffer status report provides a terminal including a logical channel identifier index value for direct communication between terminals, which is distinguished from a logical channel identity index value for communication with the base station.
- the buffer status report provides a terminal including a direct communication connection identifier index value between terminals for distinguishing at least one direct communication between the terminals.
- the buffer status report includes buffer status information on a logical channel for communication with the base station and a logical channel for direct communication between the terminals, wherein the logical channel for direct communication between the terminals communicates with the base station. It provides a terminal allocated to a logical channel group (Logical Channel Group) that is distinct from the logical channel for the.
- a logical channel group Logical Channel Group
- the present invention in the base station for controlling the direct communication between the terminal, when the buffer status report (Buffer Status Report, BSR) of the first terminal for the direct communication between the terminal, receives the buffer status report from the first terminal It provides a base station apparatus including a transmitter for transmitting radio resource allocation information for direct communication between terminals based on the receiver and the buffer status report.
- BSR Buffer Status Report
- the buffer status report may include: when the first terminal initiates direct communication between the terminals, when direct communication between the terminals is started, the radio resource from the second terminal to perform direct communication between the first terminal and the terminal.
- the radio resource from the second terminal to perform direct communication between the first terminal and the terminal.
- the direct communication between terminals on the buffer is performed.
- a base station that is triggered when at least one of the case where data exists and the retransmission timer expires and the timer for transmitting the buffer status report has expired.
- the buffer status report provides a base station including a logical channel identifier index value for direct communication between terminals, which is distinguished from a logical channel identity index value for communication with the base station.
- the buffer status report provides a base station including a direct communication connection identifier index value between terminals for distinguishing at least one direct communication between the terminals.
- the buffer status report includes buffer status information on a logical channel for communication with the base station and a logical channel for direct communication between the terminals, wherein the logical channel for direct communication between the terminals communicates with the base station.
- a base station assigned to a logical channel group (Logical Channel Group) that is distinct from the logical channel for the.
- the controller further includes a controller for allocating a logical channel for direct communication between terminals to a logical channel group that is distinct from the logical channel for communication with the base station.
- the present invention also provides a method for performing direct communication between a second terminal and a terminal by a first terminal, wherein the base station or radio resource allocation entity includes radio resource allocation request information for direct communication between the terminal and the second terminal. Transmitting a first signal; Receiving a second signal including radio resource allocation information from the base station or the radio resource allocation entity; Performing direct communication between the second terminal and the terminal based on the radio resource allocation information; And transmitting a third signal including information on a direct communication state between terminals with the second terminal.
- the third signal provides a method including at least one of indication information indicating termination of direct communication between terminals and buffer status information for direct communication between terminals.
- the second signal provides a method further comprising valid period information of the radio resource.
- the third signal provides a method including information for requesting reallocation of the radio resource based on whether the expiration date of the radio resource expires.
- the second signal further includes help information for direct communication between the terminals, wherein the help information includes discovery radio resource information for direct communication between the terminals, communication radio resource information for direct communication between the terminals, and the first information. And at least one of neighbor terminal identification information located at a distance from a terminal, the neighbor terminal location information, group identification information for performing direct communication between terminals, and data radio bearer information for switching to direct communication between terminals. Provide a method.
- the second signal is included in a system information block and transmitted.
- the second signal may further include one or more pieces of information of valid period information of the radio resource and priority information for direct communication between the terminals.
- the radio resource allocation entity provides a method for performing at least one of radio resource allocation for direct communication between terminals, sink channel transmission, and group management for direct communication between terminals.
- the present invention also provides a method for controlling direct communication between terminals by a base station, the method comprising: receiving a first signal including radio resource allocation request information for direct communication between terminals from a first terminal; Transmitting a second signal including radio resource allocation information; And receiving a third signal including information on the direct communication state between the terminals from the first terminal.
- the third signal provides a method including at least one of indication information indicating termination of direct communication between terminals and buffer status information for direct communication between terminals.
- the second signal may further include valid period information of the radio resource
- the third signal may include information for requesting reallocation of the radio resource based on whether the valid period of the radio resource expires.
- the second signal further includes help information for direct communication between the terminals, wherein the help information includes discovery radio resource information for direct communication between the terminals, communication radio resource information for direct communication between the terminals, and the first information. And at least one of neighbor terminal identification information located at a distance from a terminal, the neighbor terminal location information, group identification information for performing direct communication between terminals, and data radio bearer information for switching to direct communication between terminals. Provide a method.
- the second signal is included in a system information block and transmitted.
- the second signal may further include one or more pieces of information of valid period information of the radio resource and priority information for direct communication between the terminals.
- the base station or radio resource allocation entity in the first terminal to perform a direct communication between the second terminal and the terminal, includes radio resource allocation request information for the direct communication between the terminal and the second terminal; A transmitter for transmitting a first signal; A receiver configured to receive a second signal including radio resource allocation information from the base station or the radio resource allocation entity; And a controller configured to perform direct communication between the second terminal and the terminal based on the radio resource allocation information, wherein the transmitter includes a third signal including information on a direct communication state between terminals with the second terminal. It provides a terminal for transmitting more.
- the third signal provides a terminal including at least one of indication information indicating termination of direct communication between terminals and buffer status information for direct communication between terminals.
- the second signal provides a terminal further including valid period information of the radio resource.
- the third signal provides a terminal including information for requesting reallocation of the radio resource based on whether the expiration date of the radio resource expires.
- the second signal further includes help information for direct communication between the terminals, wherein the help information includes discovery radio resource information for direct communication between the terminals, communication radio resource information for direct communication between the terminals, and the first information. And at least one of neighbor terminal identification information located at a distance from a terminal, the neighbor terminal location information, group identification information for performing direct communication between terminals, and data radio bearer information for switching to direct communication between terminals. Provide a terminal.
- the second signal is included in a system information block and transmitted.
- the second signal provides a terminal further including one or more pieces of information of valid period information of the radio resource and priority information for direct communication between the terminals.
- the radio resource allocation entity provides a terminal that performs one or more roles of radio resource allocation for direct communication between terminals, sink channel transmission, and group management for direct communication between terminals.
- the present invention provides a base station for controlling direct communication between terminals, comprising: a receiving unit for receiving a first signal including radio resource allocation request information for direct communication between terminals from a first terminal; And a transmitting unit transmitting a second signal including radio resource allocation information, wherein the receiving unit provides a base station further receiving a third signal including information on a direct communication state between the terminals from the first terminal.
- the third signal provides a base station including at least one of indication information indicating termination of direct communication between terminals and buffer status information for direct communication between terminals.
- the second signal further includes information on the validity period of the radio resource
- the third signal provides a base station including information for requesting reallocation of the radio resource based on whether the expiration date of the radio resource expires.
- the second signal further includes help information for direct communication between the terminals, wherein the help information includes discovery radio resource information for direct communication between the terminals, communication radio resource information for direct communication between the terminals, and the first information. And at least one of neighbor terminal identification information located at a distance from a terminal, the neighbor terminal location information, group identification information for performing direct communication between terminals, and data radio bearer information for switching to direct communication between terminals.
- the help information includes discovery radio resource information for direct communication between the terminals, communication radio resource information for direct communication between the terminals, and the first information.
- the help information includes discovery radio resource information for direct communication between the terminals, communication radio resource information for direct communication between the terminals, and the first information.
- at least one of neighbor terminal identification information located at a distance from a terminal, the neighbor terminal location information, group identification information for performing direct communication between terminals, and data radio bearer information for switching to direct communication between terminals. Provide a base station.
- the second signal is included in a system information block and transmitted.
- the second signal provides a base station further including at least one of valid period information of the radio resource and priority information for direct communication between the terminals.
- the present invention also provides a method for a terminal to transmit a direct communication status report between terminals, the method comprising: receiving a first signal including direct communication setting information between terminals from a base station or a radio resource allocation entity; Confirming a trigger of the direct communication status report between the terminals based on trigger condition information; And transmitting a second signal including the direct communication status report between the terminals to the base station or the radio resource allocation entity.
- the direct communication setting information between terminals provides a method including at least one of radio resource allocation information and direct communication status reporting setting information between terminals for direct communication between terminals.
- the first signal provides a method of being received by a system information block (SIB) or higher layer signaling.
- SIB system information block
- the trigger condition information is included in the first signal or provides a method preset in the terminal.
- the direct communication status report between terminals provides a method method including discovery failure related information or direct communication failure related information between terminals for direct communication between terminals.
- the radio resource allocation entity provides an entity that performs at least one function of radio resource allocation for direct communication between terminals, a sink channel transmission, and a function of managing a terminal group for performing direct communication between terminals.
- the present invention also provides a method for receiving a direct communication status report between terminals by a base station, the method comprising: generating a first signal including direct communication setting information between terminals; Transmitting the first signal to a terminal; And receiving a second signal including a direct communication status report between the terminals from the terminal.
- the direct communication setting information between terminals provides a method including at least one of radio resource allocation information and direct communication status reporting setting information between terminals for direct communication between terminals.
- the first signal provides a method transmitted through a System Information Block (SIB) or higher layer signaling.
- SIB System Information Block
- the direct communication status report between terminals provides a method including discovery failure related information or direct communication failure related information between terminals for direct communication between terminals.
- the present invention provides a terminal for transmitting a direct communication status report between terminals, comprising: a receiving unit for receiving a first signal including direct communication setting information between terminals from a base station or a radio resource allocation entity; A control unit which checks a trigger of the direct communication status report between terminals based on trigger condition information; And a transmitter for transmitting a second signal including a direct communication status report between the terminals to the base station or the radio resource allocation entity.
- a terminal including at least one of radio resource allocation information and direct communication status report setting information between terminals for direct communication between terminals.
- the first signal provides a terminal that is received by a system information block (SIB) or higher layer signaling.
- SIB system information block
- the control unit provides a terminal that checks a trigger of the direct communication status report between the terminals based on the trigger condition information included in the first signal or preset in the terminal.
- the direct communication status report between terminals provides a terminal including discovery failure related information or direct communication failure related information between terminals for direct communication between the terminals.
- the radio resource allocation entity is a terminal that performs one or more functions of radio resource allocation for direct communication between terminals, a sink channel transmission, and a function of managing a terminal group for performing direct communication between terminals. To provide.
- the present invention also provides a base station for receiving a direct communication status report between terminals, comprising: a control unit for generating a first signal including direct communication setting information between terminals; A transmitter for transmitting the first signal to a terminal; And a receiving unit which receives a second signal including the direct communication status report between the terminals from the terminal.
- the direct communication setting information between terminals provides a base station including at least one of radio resource allocation information and direct communication status reporting setting information between terminals for direct communication between terminals.
- the first signal provides a base station transmitted through a system information block (SIB) or higher layer signaling.
- SIB system information block
- the direct communication status report between terminals provides a base station including discovery failure related information or direct communication failure related information between terminals for direct communication between terminals.
- the first terminal has the effect of receiving a radio resource that can be used for direct communication between terminals from a base station or a radio resource allocation entity capable of allocating a radio resource.
- the base station can recognize the correct information related to the direct communication between the terminals and determine the radio resource distribution based on this.
- the first terminal has an effect that can be allocated a more accurate amount of radio resources by transmitting a buffer status report for direct communication between the terminals.
- a radio resource allocation entity capable of allocating a base station or a radio resource reduces radio resource waste by receiving a separate buffer status report for direct communication between terminals from a first terminal, and efficiently saves radio resources for direct communication between terminals.
- 1 is a diagram illustrating an example of a configuration of a MAC PDU.
- FIG. 2 is a diagram illustrating an example of a format of a Short BSR MAC control element.
- FIG. 3 is a diagram illustrating an example of a long BSR MAC control element format.
- FIG. 4 is a diagram illustrating some examples of a direct communication scenario between terminals to which the present invention can be applied.
- FIG. 5 is a diagram illustrating another example of a direct communication scenario between terminals to which the present invention can be applied.
- FIG. 6 is a diagram illustrating a signal flow of a terminal and a base station according to an embodiment of the present invention.
- FIG. 7 is a diagram illustrating a configuration of a buffer status report according to another embodiment of the present invention.
- FIG. 8 is a diagram illustrating a configuration of a buffer status report according to another embodiment of the present invention.
- FIG. 9 is a table showing an example of a logical channel identifier field value according to another embodiment of the present invention.
- FIG. 10 illustrates another example of a logical channel identifier field value according to another embodiment of the present invention.
- FIG. 11 is a diagram illustrating a signal flow of a terminal and a base station according to another embodiment of the present invention.
- FIG. 12 is a diagram illustrating a logical channel group according to an allocation method according to another embodiment of the present invention.
- FIG. 13 is a diagram illustrating an operation of a first terminal according to another embodiment of the present invention.
- FIG. 14 is a diagram illustrating the operation of a base station according to another embodiment of the present invention.
- 15 is a diagram illustrating another example of an operation of a base station according to another embodiment of the present invention.
- 16 illustrates an example of semi-persistent scheduling in a downlink data transmission situation.
- FIG 17 illustrates an example of semi-persistent scheduling in an uplink data transmission situation.
- FIG. 18 is a diagram illustrating a signal flow according to an embodiment of the present invention.
- FIG. 19 is a diagram illustrating a signal flow according to another embodiment of the present invention.
- FIG. 20 is a diagram exemplarily illustrating a RadioResourceConfigDedicated information element according to another embodiment of the present invention.
- 21 is a diagram illustrating a D2D-Config information element according to another embodiment of the present invention.
- FIG. 22 is a diagram illustrating a signal flow according to another embodiment of the present invention.
- FIG. 23 is a diagram exemplarily illustrating an SPS-Config information element according to another embodiment of the present invention.
- FIG. 24 is a diagram illustrating an information element of the SPS-ConfigDL among the SPS-Config information elements according to another embodiment of the present invention.
- FIG. 25 is a diagram illustrating an information element of the SPS-ConfigUL among the SPS-Config information elements according to another embodiment of the present invention.
- FIG. 26 is a diagram illustrating a signal flow when using a timer according to another embodiment of the present invention.
- FIG. 28 is a flowchart illustrating the operation of a first terminal according to another embodiment of the present invention.
- 29 is a flowchart illustrating the operation of a base station according to another embodiment of the present invention.
- FIG. 30 is a diagram illustrating the operation of a terminal and a base station according to an embodiment of the present invention.
- 31 is a diagram illustrating operations of a terminal and a base station according to another embodiment of the present invention.
- 32 is a diagram illustrating an example of information that may be included in direct communication setting information between terminals according to another embodiment of the present invention.
- 33 is a diagram illustrating an example of information that may be included in direct communication status report information between terminals according to another embodiment of the present invention.
- 34 is a diagram illustrating operations of a terminal and a base station in case of direct communication discovery failure between terminals according to another embodiment of the present invention.
- 35 is a view illustrating operations of a terminal and a base station when a direct communication between terminals fails in accordance with another embodiment of the present invention.
- 36 is a flowchart illustrating the operation of a terminal according to another embodiment of the present invention.
- FIG. 37 is a flowchart illustrating the operation of a base station according to another embodiment of the present invention.
- 38 is a diagram illustrating a configuration of a first terminal according to another embodiment of the present invention.
- 39 is a diagram illustrating a configuration of a base station according to another embodiment of the present invention.
- the wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data, and the like.
- the wireless communication system includes a user equipment (UE) and a base station (base station, BS, or eNB).
- a user terminal is a generic concept meaning a terminal in wireless communication.
- user equipment (UE) in WCDMA, LTE, and HSPA, as well as mobile station (MS) in GSM, user terminal (UT), and SS It should be interpreted as a concept that includes a subscriber station, a wireless device, and the like.
- a base station or a cell generally refers to a station that communicates with a user terminal, and includes a Node-B, an evolved Node-B, an Sector, a Site, and a BTS.
- Other terms such as a base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell may be called.
- RRH remote radio head
- RU radio unit
- a base station or a cell is a generic meaning indicating some areas or functions covered by a base station controller (BSC) in CDMA, a Node-B in WCDMA, an eNB or a sector (site) in LTE, and the like. It should be interpreted as, and it is meant to cover all the various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, small cell communication range.
- BSC base station controller
- the base station may be interpreted in two senses. i) the device providing the megacell, the macrocell, the microcell, the picocell, the femtocell, the small cell in relation to the wireless area, or ii) the wireless area itself. In i) all devices which provide a given wireless area are controlled by the same entity or interact with each other to cooperatively configure the wireless area to direct the base station.
- the base station may indicate the radio area itself to receive or transmit a signal from a viewpoint of a user terminal or a neighboring base station.
- megacells macrocells, microcells, picocells, femtocells, small cells, RRHs, antennas, RUs, low power nodes (LPNs), points, eNBs, transmit / receive points, transmit points, and receive points are collectively referred to as base stations. do.
- the user terminal and the base station are two transmitting and receiving entities used to implement the technology or technical idea described in this specification in a comprehensive sense and are not limited by the terms or words specifically referred to.
- the user terminal and the base station are two types of uplink or downlink transmitting / receiving subjects used to implement the technology or the technical idea described in the present invention, and are used in a generic sense and are not limited by the terms or words specifically referred to.
- the uplink (Uplink, UL, or uplink) refers to a method for transmitting and receiving data to the base station by the user terminal
- the downlink (Downlink, DL, or downlink) means to transmit and receive data to the user terminal by the base station It means the way.
- CDMA Code Division Multiple Access
- TDMA Time Division Multiple Access
- FDMA Frequency Division Multiple Access
- OFDMA Orthogonal Frequency Division Multiple Access
- OFDM-FDMA OFDM-TDMA
- OFDM-CDMA OFDM-CDMA
- One embodiment of the present invention can be applied to resource allocation in the fields of asynchronous wireless communication evolving to LTE and LTE-Advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB.
- the present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.
- the uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.
- TDD time division duplex
- FDD frequency division duplex
- a standard is configured by configuring uplink and downlink based on one carrier or a pair of carriers.
- the uplink and the downlink include a Physical Downlink Control CHannel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel (PHICH), a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control CHannel (EPDCCH), and the like.
- Control information is transmitted through the same control channel, and data is configured by a data channel such as a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH).
- PDSCH physical downlink shared channel
- PUSCH physical uplink shared channel
- control information may also be transmitted using an enhanced PDCCH (EPDCCH or extended PDCCH).
- EPDCCH enhanced PDCCH
- extended PDCCH extended PDCCH
- a cell means a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.
- a wireless communication system to which embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-antenna transmission scheme in which two or more transmission / reception points cooperate to transmit a signal.
- antenna transmission system a cooperative multi-cell communication system.
- the CoMP system may include at least two multiple transmission / reception points and terminals.
- the multiple transmit / receive point is at least one having a base station or a macro cell (hereinafter referred to as an eNB) and a high transmission power or a low transmission power in a macro cell region, which is wired controlled by an optical cable or an optical fiber to the eNB. May be RRH.
- an eNB a base station or a macro cell
- a high transmission power or a low transmission power in a macro cell region which is wired controlled by an optical cable or an optical fiber to the eNB. May be RRH.
- downlink refers to a communication or communication path from a multiple transmission / reception point to a terminal
- uplink refers to a communication or communication path from a terminal to multiple transmission / reception points.
- a transmitter may be part of multiple transmission / reception points, and a receiver may be part of a terminal.
- a transmitter may be part of a terminal, and a receiver may be part of multiple transmission / reception points.
- a situation in which a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, an EPDCCH, and a PDSCH may be expressed in the form of 'sending and receiving a PUCCH, a PUSCH, a PDCCH, an EPDCCH, and a PDSCH.
- a description of transmitting or receiving a PDCCH or transmitting or receiving a signal through the PDCCH may be used as a meaning including transmitting or receiving an EPDCCH or transmitting or receiving a signal through the EPDCCH.
- the physical downlink control channel described below may mean PDCCH or EPDCCH, and may also be used to include both PDCCH and EPDCCH.
- the EPDCCH which is an embodiment of the present invention, may be applied to the portion described as the PDCCH, and the EPDCCH may be applied to the portion described as the EPDCCH as an embodiment of the present invention.
- high layer signaling described below includes RRC signaling for transmitting RRC information including an RRC parameter.
- the eNB performs downlink transmission to the terminals.
- the eNB includes downlink control information and an uplink data channel (eg, a physical downlink shared channel (PDSCH), which is a primary physical channel for unicast transmission, and scheduling required to receive the PDSCH.
- a physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission on a physical uplink shared channel (PUSCH) may be transmitted.
- PUSCH physical uplink shared channel
- 1 is a diagram illustrating an example of a configuration of a MAC PDU.
- the PDU includes a MAC header and a MAC payload.
- the MAC header may be composed of several sub-headers 100, and the MAC payload may be composed of MAC Control elements (CE), MAC Media Control Control Data Units (SDUs), and padding.
- CE MAC Control elements
- SDU MAC Media Control Control Data Unit
- each sub-header 100 corresponds to MAC CEs, MAC SDUs, and padding of MAC payload one by one in order.
- Each MAC sub-header 100 may be configured with the fields shown in Table 1 below.
- each MAC sub-header 100 may be composed of one or more fields of LCID, L, F, E, and R fields.
- the LCID field may be configured with various values.
- the value and index of the LCID field for the UL shared channel (UL-SCH) are shown in Table 2 below.
- the LCID value may be configured in various ways according to the LCID index.
- the terminal may transmit a buffer status report (BSR) to the base station.
- BSR buffer status report
- the terminal needs to request and allocate radio resources required by the base station.
- the terminal may transmit a buffer status report (BSR) indicating how much data is currently sent to the base station in the buffer.
- the base station may allocate an appropriate uplink radio resource in consideration of the received BSR.
- the BSR may be configured in two formats, a long BSR and a short BSR.
- FIG. 2 is a diagram illustrating an example of a format of a Short BSR MAC control element.
- the Short BSR may include buffer status information for one logical channel group (LCG).
- a logical channel group is a group of logical channels having similar quality of service (QoS) requirements or similar characteristics, and may exist up to four at one terminal.
- Short BSR consists of LCG ID and Buffer Size.
- LCG ID is the ID of the logical channel group of the reported buffer size. That is, buffer size information of one logical channel group is included.
- FIG. 3 is a diagram illustrating an example of a long BSR MAC control element format.
- the long BSR may include buffer status information for all (four) logical channel groups.
- a logical channel group is a bundle of logical channels with similar QoS or characteristics as described above.
- the Long BSR MAC Control Element Format 300 does not include logical channel group ID information. That is, the Long BSR is composed of four buffer sizes without a Logical Channel Group (LCG) ID field, and means a buffer size of LCG IDs 0 to 3 in order.
- the buffer size information for up to four logical channel groups may be included in order. For example, buffer size information of logical channel group 0 may be included in buffer size # 0, and buffer size information of logical channel group # 1 may be included in buffer size # 1.
- buffer sizes # 2 and # 3 may also be allocated as above.
- the two formats of BSR described above are determined and transmitted depending on the condition under which the BSR is triggered or the amount of free space in which the BSR is included.
- the BSR configured as described above is transmitted to the base station when the trigger condition is satisfied.
- the conditions under which the BSR is triggered are as follows.
- the regular BSR when the regular BSR is triggered, if there is data to be sent to two or more LCGs, the long BSR is transmitted. If there is data to send to one LCG, it transmits with short BSR.
- the UE may be allocated an uplink radio resource.
- an SR resource (Scheduling Request resource) is configured (configured) in the PUCCH
- uplink radio resources may be allocated by transmitting a Scheduling Request (SR).
- SR Scheduling Request
- the UE may receive radio resource allocation through a random access process.
- the terminal receives the uplink radio resource allocation, it can transmit the BSR to the base station.
- the base station can allocate an appropriate uplink radio resource to the terminal based on the received BSR.
- a periodic BSR or a padding BSR is triggered instead of a regular BSR, the SR is not triggered or the random access procedure is triggered.
- the direct communication between terminals in the present specification may mean D2D communication, and in addition, it means various communication that performs communication between terminals without passing through a base station using radio resources.
- D2D communication will be described with reference to the accompanying drawings .
- the description of the D2D communication by way of example is only for understanding. That is, the present invention can be applied to both direct communication between terminals that directly transmit and receive data and signals between terminals without passing through a base station by using radio resources of a mobile communication network such as D2D communication.
- FIGS. 4 and 5 As the D2D communication, a scenario as shown in FIGS. 4 and 5 may be considered.
- FIG. 4 is a diagram illustrating some examples of a direct communication scenario between terminals to which the present invention can be applied.
- scenario 1A is a case where both UE1 and UE2 performing D2D communication are located outside the coverage of the mobile communication base station. That is, although UE1 and UE2 are both located outside the coverage of the mobile communication base station, they are scenarios in which data and signals can be transmitted and received by performing D2D communication.
- UE1 performing D2D communication is located within the coverage of the mobile communication base station, and UE2 is located outside the coverage.
- the UE1 and the UE2 may transmit and receive data and signals.
- FIG. 5 is a diagram illustrating another example of a direct communication scenario between terminals to which the present invention can be applied.
- scenario 1C is a case where both UE1 and UE2 performing D2D communication are located within the coverage of the mobile communication base station. Even in this case, UE1 and UE2 may transmit and receive data and signals without passing through the base station.
- both UE1 and UE2 performing D2D communication are located within the coverage of the mobile communication base station, but each UE is located within the coverage of a different cell. That is, UE1 is located within the coverage of the first base station and UE2 is located within the coverage of the second base station. Even in this case, the UE1 and the UE2 can directly transmit and receive data and signals without passing through the base station.
- a buffer state reporting method in performing direct communication between terminals of the present invention, a buffer state reporting method, a radio resource allocation method, and a communication state reporting method will be described in each embodiment.
- descriptions such as the first to third signals are used in the same manner in the corresponding method, but may be used in different meanings in other methods. That is, for example, the first signal used in the buffer status reporting method and the first signal used in the radio resource allocation method may have different meanings.
- the corresponding signals are defined and explained.
- the UE for performing the D2D communication is a base station or an entity having a right or a function (for example, a radio resource allocation entity) for allocating a radio resource to a mobile communication network. You need to give information.
- a terminal performing D2D communication or having a D2D communication function may transmit a buffer status report (hereinafter, referred to as a 'BSR') to a base station or a radio resource allocation entity.
- a 'BSR' buffer status report
- the base station or radio resource allocation entity cannot distinguish whether the corresponding BSR is information related to the amount of data to be transmitted to another D2D terminal or information related to the amount of data to be transmitted through the base station. Therefore, it is impossible for the base station to determine how much to allocate radio resources to communication through the base station and D2D communication, respectively.
- the present invention for solving this problem is to allow the base station or radio resource allocation entity to allocate the appropriate radio resources for the D2D communication of the terminal, thereby preventing waste of radio resources, and smoothly perform D2D communication.
- FIG. 6 is a diagram illustrating signal flow of a terminal and a base station according to an embodiment of the present invention.
- the first terminal transmits the BSR to the base station.
- the first terminal can transmit not only the base station but also the radio resource allocation entity having the radio resource allocation function. Even when the first terminal transmits the BSR to the radio resource allocation entity, the detailed operations of the present invention described below may be equally applied.
- a buffer status report (BSR) is triggered for direct communication between the second terminal and the terminal. And transmitting the buffer status report to the base station or the radio resource allocation entity, and receiving radio resource allocation information for direct communication between the terminal and the second terminal from the base station or the radio resource allocation entity.
- the first terminal 609 that is in D2D communication or intends to perform D2D communication may detect a trigger of a BSR for D2D communication (S610).
- the first terminal 609 in D2D communication or trying to communicate in D2D reports the buffer status report (BSR) to the base station 601 also for the amount of data to be transmitted through the D2D communication (entering the first terminal buffer).
- BSR buffer status report
- the first UE that is in D2D communication or intends to communicate with D2D does not include the BSR in the corresponding MAC PDU when the BSR is triggered, and corresponds to the MAC PDU for base station transmission. Transmit including BSR.
- the BSR may be configured independently for D2D communication, or may be transmitted as one BSR in combination with an existing BSR.
- the base station 601 receiving the aforementioned BSR may transmit radio resource allocation information (D2D Grant) for D2D communication based on the received BSR (S630).
- the first terminal 609 may perform D2D communication with the second terminal 602 based on radio resource allocation information (D2D Grant) allocated from the base station 601 (S640).
- the base station 609 may allocate radio resources to dynamic scheduling or semi-persistent scheduling (SPS) based on the BSR for the amount of data to be transmitted through the received D2D communication.
- the second terminal may refer to an entity performing communication using radio resources of the mobile communication network without passing through the first terminal and the base station of the present invention.
- the second terminal may be at least one entity that performs direct communication between the first terminal and the terminal of the present invention. Therefore, the second terminal described herein may be at least one or more entities as a target for performing direct communication (eg, D2D communication) between the first terminal and the terminal, or means a group for performing direct communication between the terminals. You may.
- the first terminal of the present invention configures and transmits a BSR including information on the data amount of a buffer for direct communication between terminals
- a method of dividing and transmitting the BSR for the communication through the base station and the BSR for the direct communication between the terminals will be described for each embodiment with reference to the drawings.
- First embodiment a method of using a dedicated BSR for an amount of data transmitted through direct communication between terminals (eg, D2D communication).
- the first terminal When performing communication using D2D, the first terminal according to the present invention does not transmit a BSR including D2D transmission. If the BSR is triggered in the D2D communication, the first terminal may transmit the corresponding BSR to a base station or a radio resource allocation entity having a radio resource allocation function.
- the first terminal may detect whether a BSR for D2D communication is triggered. If, for example, data for D2D communication enters a buffer, the BSR of the first terminal may be triggered. When the BSR for D2D communication is triggered, the first terminal may transmit the BSR to a base station or a radio resource allocation entity having a radio resource allocation function, without transmitting the BSR to the second terminal performing the D2D communication.
- the base station or the radio resource allocation entity may obtain information about the D2D data of the first terminal to perform efficient radio resource allocation and allocation.
- the BSR transmitted to the base station may be a dedicated BSR that is distinguished from the BSR used for communication through the existing base station.
- FIG. 7 is a diagram illustrating a configuration of a buffer status report according to another embodiment of the present invention.
- the D2D BSR may be configured as shown in FIG. 7.
- the first terminal may configure and transmit a dedicated BSR for D2D communication. That is, in the configuration of the BSR including buffer information of one logical channel, R is a reserved bit and the buffer size may be a value including information about the amount of data stored in the buffer for D2D communication. have.
- FIG. 8 is a diagram illustrating a configuration of a buffer status report according to another embodiment of the present invention.
- the first terminal may transmit information on the amount of data for D2D communication using an existing BSR format. That is, as described with reference to FIGS. 2 and 3, the BSR may be configured in the same format as that of the BSR used in communication through the base station.
- the first terminal capable of performing D2D communication may configure a D2D connection with at least one terminal.
- at least one logical channel may be configured for each D2D connection.
- the first terminal can configure a D2D connection with at least one terminal. That is, the first terminal can configure the D2D connection with the second terminal and can also configure the D2D connection with the third terminal.
- the first terminal configures a D2D connection with the second terminal
- at least one logical channel may exist.
- the first terminal may have at least one logical channel.
- the first terminal may configure at least one or more D2D connections for the direct communication between the terminals, and each connection for each D2D communication may include at least one logical channel for the D2D communication.
- the buffer size information may be sequentially configured according to the order of each logical channel group or the order of each D2D connection. That is, buffer size # 0 may include buffer size information of logical channel group # 0, and buffer size # 1 may include buffer size information of logical channel group # 1. That is, even when there are two or more logical channels for D2D communication, a dedicated BSR for D2D may be configured and transmitted.
- the buffer size information including the D2D connection identifier information may be transmitted to which UE of at least one or more D2D connections relates to the D2D connection.
- the first terminal may configure a dedicated BSR for D2D and transmit the same to the base station.
- the base station can efficiently manage the D2D radio resources by distinguishing between the BSR of the first terminal communicating with the existing base station and the dedicated BSR for D2D.
- 9 and 10 are tables showing logical channel identifier values and indices for distinguishing a D2D dedicated BSR from an existing BSR.
- FIG. 9 is a table showing an example of a logical channel identifier field value according to another embodiment of the present invention.
- a logical channel for D2D may be newly defined.
- a specific index 900 may be allocated as an index indicating a BSR for D2D among the reserved logical channel identifier (LCID) index values.
- LCID logical channel identifier
- the BSR for D2D may include index information 900 having a logical channel identifier value (or a D2D connection identifier value) that may indicate that the reserved bit is a D2D BSR. That is, as shown in FIG. 7, when a dedicated BSR for D2D is transmitted for one logical channel, a logical channel identifier index (or D2D connection identifier index) (D2D) for D2D instead of a reserved bit may be used. You can also go in.
- the logical channel identifier index (or D2D connection identifier index value) value '11000' may be defined as an index indicating a BSR for D2D. Thereafter, when the first terminal transmits a dedicated BSR for D2D communication to the base station, the first terminal may include the corresponding index value 11000. The base station may confirm that the index value of the received BSR is '11000' to confirm that the received BSR is a D2D dedicated BSR.
- index information for indicating whether the transmitted D2D BSR relates to which UE among the plurality of terminals is included in the D2D connection may be. That is, the BSR including the index information having the above-described D2D connection identifier value is a D2D dedicated BSR, and may transmit information such as BSR for a logical channel configured with a specific terminal.
- the terminal configures the D2D connection with the plurality of terminals, and there are a plurality of logical channels in each D2D connection.
- the information can also be sent.
- the present invention will be described in the case where the first terminal configures one D2D connection with the second terminal for convenience of explanation and understanding.
- the D2D connection is configured with the plurality of terminals, and each D2D connection is performed.
- the same may be applied to the case where there are a plurality of logical channels. That is, for example, information on each BSR may be specifically transmitted through the above-described logical channel identifier value and / or D2D connection identifier value.
- FIG. 10 illustrates another example of a logical channel identifier field value according to another embodiment of the present invention.
- the D2D dedicated BSR may indicate a predefined one of a Long BSR format or a Short BSR format.
- an index reserved for a D2D dedicated BSR may be allocated to each BSR format as shown in FIG. 10.
- each index may be allocated according to the format of each BSR.
- '10110' may be allocated to the Truncated BSR for D2D and '10111' may be allocated to the Short BSR for D2D to correspond to the indexes 1010 allocated to the format of the existing BSR.
- '11000' may be allocated to the D2D long BSR. Therefore, even when transmitting a dedicated BSR for D2D, the first terminal may transmit an index value corresponding to each BSR format.
- the base station may check that the dedicated BSR is a D2D through the index, and may check whether the BSR is a long BSR or a short BSR when each index is allocated as shown in FIG. 10.
- the first terminal transmits a dedicated D2D BSR including 11000 index to the base station.
- Buffer size information according to the order of each logical channel may be included in order in the buffer configuration of FIG.
- the first terminal may transmit the aforementioned D2D dedicated BSR to the base station.
- the D2D dedicated BSR may be triggered when the following condition is satisfied.
- ⁇ It may be triggered when the first terminal attempts to start D2D communication by itself or when UE initiates D2D communication.
- ⁇ Can be triggered when data of higher priority D2D logical channel data is in the buffer.
- ⁇ Can be triggered when data for new D2D transmission enters empty buffer.
- the periodic timer may use a timer of an existing BSR together or use a new timer for a BSR for D2D.
- a related value may be set through higher layer signaling (eg, an RRC message).
- Long BSR or Short BSR may be included depending on the remaining space.
- both the BSR and the D2D dedicated BSR for the communication through the existing base station is triggered, in the case of the Regular BSR, both can be included in the MAC CE and transmitted.
- the base station may allocate a radio resource to dynamic scheduling based on the received D2D dedicated BSR, or may be allocated through semi-persistent scheduling (SPS).
- SPS semi-persistent scheduling
- Second Embodiment A method using one BSR for radio resource request for communication with a base station and for D2D communication.
- the first terminal may transmit a BSR for communication through an existing base station and a BSR for D2D communication through one BSR.
- the first terminal may transmit the BSR to the base station by merging the corresponding BSR with the BSR of the base station without transmitting the BSR in the D2D transmission.
- the transmitted BSR may be configured to simultaneously include information on the amount of data for communication through the existing base station and the amount of data for D2D transmission.
- FIG. 11 is a diagram illustrating a signal flow of a terminal and a base station according to another embodiment of the present invention.
- the base station 1101 assigns each logical channel identity of the first terminal 1109 to a logical channel group.
- the base station 1101 may be divided into a logical channel group for communication through the base station and a logical channel group for D2D communication (S1110).
- the base station of the present invention allocates a logical channel to a logical channel group
- the base station does not allocate a logical channel of the base station and the D2D communication to one logical channel group to distinguish logical channels for D2D communication. That is, one logical channel group (LCG) is not assigned a logical channel (Logical Channel Identity) for transmission through the base station and a logical channel (Logical Channel Identity) for D2D.
- LCG logical channel group
- Logical Channel Identity Logical Channel Identity
- the first terminal 1109 may transmit the corresponding BSR to the base station 1101 (S1130).
- the base station 1101 may transmit radio resource allocation information to the first terminal 1109 based on the BSR received from the first terminal 1109.
- the first terminal 1109 performs D2D communication with the second terminal 1102 to perform direct communication between terminals based on the received radio resource allocation information (S1150).
- the base station can determine whether the information included in the BSR is buffer status information for the D2D communication by allocating the D2D logical channel to a logical channel group different from the logical channel for the communication through the base station.
- FIG. 12 is a diagram illustrating a logical channel group according to an allocation method according to another embodiment of the present invention.
- a logical channel group refers to a group of logical channels having similar Qos requirements or similar characteristics. For example, up to four logical channel groups may exist in the first terminal. Therefore, the case of four logical channel groups is demonstrated for example.
- D-LCH (D2D-Logical CHannel) is a logical channel for D2D communication. That is, there may be a case where two logical channels for D2D communication of D-LCH # 0 and D-LCH # 1 exist in the first terminal.
- the base station may allocate logical channels for communication through the existing general base station.
- LCH # 3 is assigned to LCG 0 (1200)
- LCH # 5 is assigned to LCG 1 (1201) and LCG 2 (1202) according to the characteristics of the logical channel.
- LCH # 4 and LCH # 6 may be allocated to.
- the base station may assign only logical channels for LCG 3 1203 for D2D communication.
- LCG 3 1203 may allocate D-LCH # 0 and D-LCH # 1.
- the base station can distinguish between the communication through the base station and the D2D communication, and can efficiently allocate radio resources based on the respective BSR information.
- the first terminal may configure and transmit the aforementioned BSR format. For example, when the Long BSR is triggered, buffer size information of each logical channel group 1200-1203 can be configured and transmitted in order.
- the base station may check the buffer size of the LCG 3 1203 based on the received BSR.
- the BSR may be transmitted only for the LCG having the highest priority, or the BSR may be transmitted only for the LCG 1203 for D2D transmission. That is, when Short BSR is transmitted, only information on one LCG may be included, which may be determined according to priority setting.
- the first terminal may transmit the BSR when any one or more conditions of the existing BSR trigger condition and the BSR trigger condition for D2D communication are satisfied.
- the BSR may be triggered when the following condition is satisfied.
- ⁇ It may be triggered when the first terminal attempts to start D2D communication by itself or when UE initiates D2D communication.
- ⁇ Can be triggered when data of higher priority D2D logical channel data is in the buffer.
- ⁇ Can be triggered when data for new D2D transmission enters empty buffer.
- ⁇ Can be triggered when new data to be sent enters the empty buffer.
- ⁇ Can be triggered when there is data to be sent in the buffer and the retransmission timer expires.
- the periodic timer for D2D may be the same as the timer of the existing BSR, or a new timer for the BSR for D2D may be defined and used.
- a related value may be set through higher layer signaling (eg, an RRC message).
- ⁇ Can be triggered when existing cycle timer expires. For example, even if a periodic timer for D2D is separately defined, it may be triggered even when a periodic timer for BSR that can be used for communication through a base station expires.
- Long BSR or Short BSR may be included depending on the remaining space.
- the base station recognizes the amount of data for D2D transmission of the first terminal through each embodiment described above, thereby providing a radio resource of an appropriate size to the corresponding first terminal.
- the D2D communication can be managed to proceed smoothly, and the radio resources used for the communication through the base station and the radio resources for the D2D communication can be appropriately allocated. This allows the base station to improve the performance of the entire system.
- FIG. 13 is a diagram illustrating an operation of a first terminal according to another embodiment of the present invention.
- a first terminal includes a step of triggering a buffer status report (BSR) for direct communication between terminals and a buffer status report of a base station.
- the method may include transmitting to a radio resource allocation entity and receiving radio resource allocation information for direct communication between terminals from a base station or a radio resource allocation entity.
- the first terminal of the present invention may trigger a buffer status report (BSR) for direct communication between terminals (S1310).
- BSR buffer status report
- the first terminal initiates direct communication between terminals
- direct communication between terminals is started, when a radio resource request is received from a second terminal to perform direct communication between the first terminal and the terminal.
- data for direct communication between terminals having a higher priority enters the buffer
- data for direct communication between terminals enters the buffer
- data for direct communication between terminals exists in the buffer and the retransmission timer expires. It may be triggered when at least one of a case and a case when the timer for transmitting the buffer status report has expired. In addition, it may be triggered when the trigger condition described in each embodiment described above is satisfied.
- the first terminal may transmit the buffer status report to the base station or the radio resource allocation entity (S1320).
- the radio resource allocation entity refers to a terminal that performs at least one function of managing a terminal group performing radio resource allocation, sync channel transmission, and direct communication between terminals for direct communication between terminals.
- the radio resource allocation entity may be a radio resource allocation entity, and for example, D2D communication may be referred to in various terms such as a cluster head, a central control entity, and a central entity.
- the buffer status report transmitted by the first terminal to the base station may be configured differently according to the first and second embodiments described above.
- a dedicated buffer status report for direct communication between terminals may be configured and transmitted.
- the buffer status report may include a logical channel identifier index value (or a D2D connection index value) for direct communication between terminals, which is distinguished from a logical channel identity index value for communication with a base station.
- a plurality of index values may be defined and included, or only one index value may be defined and included.
- the buffer status report may include a D2D connection identifier index value.
- both the logical channel identifier index value and the D2D connection identifier index value may be included, or a separate index value defining both values may be included.
- logical channels for direct communication between terminals may be allocated to specific logical channel groups.
- the buffer status report includes buffer status information for a logical channel for communication with a base station and a logical channel for direct communication between terminals, but the logical channel for direct communication between terminals is for communication with a base station. It may be assigned to a logical channel group (Logical Channel Group) that is distinct from the logical channel.
- the first terminal receives radio resource allocation information for direct communication between terminals from the base station (S1330).
- the first terminal may perform direct communication between terminals based on the received radio resource allocation information.
- FIG. 14 is a diagram illustrating the operation of a base station according to another embodiment of the present invention.
- the first The method may include receiving a buffer status report from a terminal and transmitting radio resource allocation information for direct communication between terminals based on the buffer status report.
- the base station may receive a buffer status report for direct communication between terminals from the first terminal (S1410).
- the buffer status report may receive a buffer status report including information on the amount of data for direct communication between the terminals.
- the buffer status report when a first terminal initiates direct communication between terminals, when a direct communication between terminals is initiated, a radio resource request is received from a second terminal to perform direct communication between the first terminal and the terminal.
- a radio resource request is received from a second terminal to perform direct communication between the first terminal and the terminal.
- the buffer status report received by the base station may be configured differently according to each embodiment of the present invention described above.
- a dedicated buffer status report for direct communication between terminals may be configured and received.
- the buffer status report may include a logical channel identifier index value for direct communication between terminals, which is distinguished from a logical channel identity index value for communication with a base station.
- a plurality of index values may be defined and included, or only one index value may be defined and included.
- the buffer status report may include a D2D connection identifier index value.
- both the logical channel identifier index value and the D2D connection identifier index value may be included, or a separate index value defining both values may be included.
- the base station may allocate radio resources for direct communication between terminals based on the received buffer status report and transmit radio resource allocation information (S1420).
- 15 is a diagram illustrating another example of an operation of a base station according to another embodiment of the present invention.
- logical channels for direct communication between terminals may be allocated to a specific logical channel group (S1510).
- the buffer status report includes buffer status information for a logical channel for communication with a base station and a logical channel for direct communication between terminals, but the logical channel for direct communication between terminals is for communication with a base station. It may be assigned to a logical channel group (Logical Channel Group) that is distinct from the logical channel.
- the base station may allocate at least one logical channel for direct communication between terminals to a specific logical channel group. That is, a logical channel for communication through a base station and a logical channel for direct communication between terminals are allocated to separate logical channel groups without being assigned to the same logical channel group.
- the base station may receive a buffer status report including buffer information for direct communication between terminals from the first terminal (S1520).
- the buffer status report may include a merged buffer status of the logical channel for communication with the base station and the logical channel for direct communication between terminals.
- a logical channel group to which logical channel (s) are allocated for direct communication between terminals may be distinguished from a logical channel group for communication through a base station.
- the base station may allocate radio resources for direct communication between terminals based on the received buffer status report.
- the base station may transmit radio resource allocation information for direct communication between terminals to the first terminal (S1530).
- the first terminal has the effect of receiving a radio resource that can be used for direct communication between terminals from a base station or a radio resource allocation entity capable of allocating a radio resource.
- the first terminal has an effect that can be allocated a more accurate amount of radio resources by transmitting a buffer status report for direct communication between the terminals.
- a radio resource allocation entity capable of allocating a base station or a radio resource reduces radio resource waste by receiving a separate buffer status report for direct communication between terminals from a first terminal, and efficiently saves radio resources for direct communication between terminals.
- the base station may allocate radio resources for data transmission and reception of the terminal.
- the uplink radio resource may be allocated based on the above-described BSR information, or the radio resource may be allocated to transmit downlink data and signals.
- SPS semi-persistent scheduling
- Semi-Persistent Scheduling is a scheduling method for services in which small size data transmission such as Voice over Internet Protocol (VoIP) repeatedly occurs in a short cycle. For example, when a terminal transmits and receives data for a voice call, voice packets of a similar size are generated and transmitted at regular intervals. That is, in order for the terminal to transmit the packet, the base station should allocate a similar amount of radio resources at regular intervals. If dynamic scheduling is used for the VoIP service, a large number of PDCCHs are continuously used to transmit downlink assignment and uplink grant information. Since the number of PDCCHs is limited, if a terminal uses a large number of PDCCHs, the base station can reduce the number of users that can serve in the cell. Therefore, in order to minimize the load of the PDCCH, semi-persistent scheduling (SPS) is a method of scheduling at a time to periodically use a certain size of resources for a long period of time.
- SPS semi-persistent scheduling
- 16 illustrates an example of semi-persistent scheduling in a downlink data transmission situation.
- the base station 1601 may schedule radio resources for downlink data transmission to the terminal 1609.
- the base station 1601 may transmit higher layer signaling including the SPS configuration information (SPS-config) to the terminal 1609 (S1610).
- SPS-config SPS configuration information
- higher layer signaling may be an RRC reconfiguration message.
- the base station 1601 may transmit a PDCCH for SPS activation to the terminal 1609 (S1620).
- the base station 1601 transmits downlink data (S1630, S1640, and S1650).
- the base station 1601 may transmit the PDCCH for terminating the SPS scheduling (S1660). Through such a procedure, the base station may transmit a small amount of periodically generated data to the terminal through one scheduling. Therefore, it is possible to reduce the consumption of PDCCH resources due to the transmission of the downlink data generated every time.
- FIG 17 illustrates an example of semi-persistent scheduling in an uplink data transmission situation.
- the base station 1701 may schedule radio resources for receiving uplink data from the terminal 1709.
- the base station 1701 may transmit higher layer signaling including the SPS configuration information (SPS-config) to the terminal 1709 (S1710).
- SPS-config SPS configuration information
- higher layer signaling may be an RRC reconfiguration message.
- the base station 1701 may transmit the PDCCH for SPS activation to the terminal 1709 (S1720).
- the terminal 1709 receives the PDCCH including the SPS activation information
- the terminal 1709 transmits uplink data to the base station 1701 (S1730, S1740, and S1750).
- the base station 1701 may transmit the PDCCH for terminating the SPS scheduling after the transmission of the uplink data of the terminal 1709 (S1760). As another example, the base station 1701 may not transmit the PDCCH for terminating the SPS scheduling. In this case, if uplink data is not received for a predetermined time or a predetermined number of times, the SPS scheduling may be terminated. Through such a procedure, the UE may transmit a small amount of periodically generated data to the base station through one scheduling. Therefore, it is possible to reduce the consumption of PDCCH resources due to the transmission of uplink data generated every time.
- the base station can not recognize whether the D2D communication is terminated.
- the base station allocates a certain radio resource to the terminal to use for D2D communication, the base station does not know when the terminal's D2D communication is terminated, so it does not know when to release the resource. . Therefore, unused D2D radio resources may be unnecessarily allocated continuously, which may cause a problem that the base station cannot use the corresponding resources when scheduling and waste.
- the present invention enables the base station to know whether the terminal terminates the D2D communication, thereby preventing unnecessary allocation of radio resources by the terminated D2D communication. Through this, the base station can efficiently manage radio resources.
- radio resource allocation request information for direct communication between the second terminal and the terminal is transmitted to a base station or a radio resource allocation entity.
- Transmitting a first signal including receiving a second signal including radio resource allocation information from a base station or a radio resource allocation entity, and performing direct communication between the second terminal and the terminal based on the radio resource allocation information; And transmitting a third signal including information on a direct communication state between terminals with the second terminal.
- the first terminal 1809 may include a first signal including information for requesting radio resource allocation required for performing direct communication between the second terminal and the terminal to the base station 1801. It may transmit (S1810).
- the first terminal 1809 may transmit the first signal to an entity for allocating radio resources.
- the entity for allocating a radio resource may mean an entity that performs at least one of radio resource allocation for direct communication between terminals, sink channel transmission, and group management for direct communication between terminals. That is, the radio resource allocation entity may be called in various terms such as a cluster head, a central control entity, a central entity, for example, using D2D communication.
- a base station refers to an entity that partially plays the role of a base station, such as radio resource allocation, transmission of a sync channel, or D2D group management when terminals are located outside the coverage of the aforementioned D2D communication scenario.
- a base station will be mainly described as an example, but the operation of including the aforementioned radio resource allocation entity in place of the base station is also included in the scope of the present invention.
- the base station 1801 or the radio resource allocation entity may allocate a radio resource for direct communication between terminals to the first terminal 1809 and transmit a second signal including the corresponding allocation information in operation S1820.
- the first terminal 1809 receives radio resource allocation information and performs direct communication between the second terminal and the terminal by using the allocated radio resource (S1830).
- the first terminal 1809 may transmit a third signal including information on the communication state of the terminal-to-terminal direct communication with the second terminal to the base station 1801 (S1840).
- the second terminal refers to an entity capable of transmitting and receiving data and signals using radio resources of the mobile communication network without passing through the terminal and the base station of the present invention.
- the second terminal may be at least one entity, and for the convenience of description, the second terminal may be described as a singular or plural.
- the communication state of the direct communication between the terminal and the second terminal may be defined differently according to each embodiment described below.
- it may be direct communication termination information or radio resource allocation re-request information between terminals, and each case will be described in detail below.
- First embodiment A method in which a first terminal transmits a direct communication termination message between terminals (eg, D2D) with a second terminal.
- terminals eg, D2D
- Explicit release is a method of releasing an allocated radio resource through an explicit message such as a communication termination message.
- the D2D communication terminal may transmit a D2D communication end message.
- FIG. 19 is a diagram illustrating a signal flow according to another embodiment of the present invention.
- the first terminal 1909 wishing for D2D communication transmits a request message for the D2D communication to the base station 1901 (S1910).
- the request message may include radio resource allocation request information.
- the request message may be an RRC message or higher layer signaling.
- the transmission of the request message may additionally include assistance information for D2D communication.
- the assistance information may include radio resources such as data amount information to be transmitted through D2D communication, data type for D2D communication, neighbor terminal ID information for D2D communication, and DRB information to be transmitted through D2D communication. May contain information needed to be assigned.
- the D2D data amount may be terminal buffer state information for D2D communication.
- the base station 1901 Upon receiving the request message, the base station 1901 allocates a radio resource to be used for D2D communication to the first terminal 1909 that has transmitted the message (S1920).
- the radio resource allocation message transmitted from the base station 1901 to the first terminal 1909 may additionally include assistance information for D2D communication.
- the assistance information transmitted by the base station to the first terminal may include D2D discovery radio resource information, D2D communication radio resource information, neighbor terminal ID information, neighbor terminal location information, and DRB information to switch to D2D communication. It may include.
- the D2D assistance information transmitted from the base station to the first terminal may be transmitted in an RRC message or transmitted through a PDCCH.
- the D2D assistance information may be broadcast through a system information block (SIB).
- SIB system information block
- the D2D request step of step S1910, which is procedure 1 may be omitted.
- the first terminal 1909 that has been allocated radio resources for D2D performs D2D communication with one or more second terminals 1902 using the corresponding radio resources (S1930).
- the first terminal 1909 transmits a D2D communication end message to the base station 1901 (S1940). That is, the first terminal 1909 may transmit a D2D communication end message with the third signal described with reference to FIG. 18.
- the base station 1901 may receive the termination message and recognize that the D2D communication of the first terminal 1909 is terminated.
- the base station 1901 Upon receiving the D2D communication end message, the base station 1901 uses the corresponding radio resource for other communication. That is, the base station 1901 can allocate radio resources allocated for D2D communication for other communications, thereby enabling efficient radio resource management.
- FIG. 20 is a diagram exemplarily illustrating a RadioResourceConfigDedicated information element according to another embodiment of the present invention.
- the terminal-to-device (D2D) direct communication assistance information that may be transmitted / received in steps S1910 and S1920 may include one or more of the following information.
- the assistance information may include D2D discovery radio resource information, D2D communication radio resource information, group ID information for D2D communication, data amount information to be transmitted through D2D communication, and data type for D2D communication.
- the terminal may include one or more pieces of information of neighboring terminal ID information for D2D communication, DRB information to be transmitted through D2D communication, and HARQ process information to be used for D2D communication.
- the aforementioned D2D direct communication assistance information may be configured as a D2D configuration information element.
- the above-described D2D configuration information element may be included in an RRC connection reconfiguration message or may be configured as a new RRC message.
- it may be composed of the RRC message shown in FIG.
- the d2d-config field 2010 may be added to the RadioResourceConfigDedicated information element 2000 to transmit the above-described help information.
- the RadioResourceConfigDedicated information element may include various fields. For example, various fields included and corresponding information are summarized in the table below.
- 21 is a diagram illustrating a D2D-Config information element according to another embodiment of the present invention.
- Each information element included in the D2D-config field 2100 included in FIG. 20 is as shown in FIG. 21.
- group ID information for performing D2D communication For example, group ID information for performing D2D communication, discovery frequency information, D2D frequency information, information on a D2D scheduling scheme (eg, D2D semi persist scheduling interval information), number Of Conf SPS-Processes information, period ( duration) information, drb-ToAddModList information, and d2dUE-Identity information.
- D2D scheduling scheme eg, D2D semi persist scheduling interval information
- number Of Conf SPS-Processes information e.g, number Of Conf SPS-Processes information
- period ( duration) information e.g., drb-ToAddModList information
- d2dUE-Identity information For example, group ID information for performing D2D communication, discovery frequency information, D2D frequency information, information on a D2D scheduling scheme (eg, D2D semi persist scheduling interval information), number Of Conf SPS-Processes information, period ( duration) information, drb-ToAddModList information, and d2dUE-Ident
- the base station allocates radio resources. For example, there is a method of fixedly allocating a radio resource, a method of dynamically allocating, or a scheduling method according to a semi-persistent scheduling (SPS) method.
- SPS semi-persistent scheduling
- the present invention may operate in the following steps.
- a first terminal desiring D2D communication transmits a D2D communication start message to a base station as a first signal.
- the start message may include one or more pieces of information including indication information indicating D2D communication, resource request information required for D2D communication, and assistance information including an amount of data to be transmitted to the D2D.
- the base station receiving the communication start message may allocate a radio resource to be used for D2D communication to the first terminal that has transmitted the communication start message as the second signal. For example, the base station sets an SPS configuration for D2D communication of the first terminal through an RRC connection reconfiguration procedure, and activates the corresponding SPS for D2D through the PDCCH with D2D-RNTI. You can. As another example, a dedicated SPS configuration for D2D may be set, and the first terminal receiving the corresponding message may set the SPS and immediately activate the SPS.
- the first terminal to which resources are allocated performs D2D communication with a second terminal for D2D communication by using the corresponding radio resource.
- the first terminal transmits a D2D communication end message to the base station as a third signal.
- the end message may include one or more pieces of information indicating an end of D2D communication and first terminal buffer information on data transmitted through the D2D.
- the base station may determine the end of the D2D communication based on the radio resource information required for the D2D communication received from the first terminal or the data amount information to be transmitted.
- the base station receiving the termination message can efficiently manage the radio resources by recovering the corresponding radio resources and allocating them as radio resources for other communication.
- a method of setting an effective period for radio resource allocation (for example, a method of setting a D2D duration).
- An implicit release is a method for implicitly releasing radio resources by setting a period in radio resource allocation for direct communication between terminals.
- D2D communication will be described as an example of direct communication between terminals.
- the base station may provide the first terminal with duration information which is a valid time of D2D communication when providing the above-described D2D assistance information or when allocating radio resources for D2D communication.
- the D2D assistance information may further include one or more information of D2D discovery radio resource information, D2D communication radio resource information, neighbor terminal ID information, and neighbor terminal location information.
- the first terminal receiving the message including the above valid time information starts a timer with a duration value.
- the timer expires the corresponding D2D assistance information is released and the D2D communication ends.
- the first terminal to continue the D2D communication may transmit a re-request message to the base station before or after the timer expires.
- Embodiment 2-1 A method for setting a validity duration in an SPS configuration.
- the above implicit release method of the present invention can be applied to the radio resource allocation method of the SPS method.
- FIG. 22 is a diagram illustrating a signal flow according to another embodiment of the present invention.
- the base station may transmit the SPS configuration information to the first terminal for radio resource allocation for D2D communication.
- the SPS configuration may include duration information of the corresponding SPS information.
- the first terminal may start a timer with a duration value upon receiving configuration information or upon receiving an SPS activation message. When the timer expires, the corresponding SPS configuration information is deactivated or released. Therefore, the first terminal to continue the D2D communication may transmit a re-request message requesting radio resources to the base station before or after the timer expires.
- the first terminal 2209 may transmit a request message for D2D communication with the second terminal to the base station 2201 (S2210).
- the request message may include radio resource allocation request information.
- it may further include assistance information for D2D communication.
- the help information includes one or more pieces of data amount information to be transmitted through D2D communication, data type for D2D communication, neighbor terminal ID information for D2D communication, DRB information to be transmitted through D2D communication, and desired duration value. May be included.
- the D2D data amount may be first terminal buffer state information for D2D communication.
- the above-described D2D assistance information may be configured as an RRC Connection Reconfiguration message.
- the base station 2201 may transmit the SPS configuration information to the first terminal 2209 including the validity duration information (S2220).
- the SPS configuration information may be existing SPS-config information or may be D2D-SPG-config information newly defined for D2D.
- the SPS configuration information may further include assistance information for D2D communication.
- the assistance information includes D2D discovery channel information, D2D frequency information, D2D radio resource allocation information, neighbor terminal ID information, neighbor terminal location information, DRB information to switch to D2D communication, HARQ process information to be used for D2D communication.
- group ID information for use in D2D communication.
- the first terminal 2209 may start a timer with a validity value (S2230). That is, the first terminal 2209 receiving the signal including the SPS configuration information, the radio resource allocation information, and the valid period information may start the internal timer based on the valid period information.
- the base station 2201 may transmit the indication information indicating the start of the timer to start the timer. That is, the SPS configuration information and the validity period may be transmitted first, and then the timer may be started through the indication information.
- the first terminal 2209 may perform D2D communication with the second terminal 2202 on the allocated radio resource based on the received signal (S2240).
- the first terminal 2209 intending to continue D2D communication transmits a re-request message before or after the timer expires (S2260). That is, since the D2D communication has not been terminated as the information on the D2D communication state, a re-request message for re-requesting a radio resource may be transmitted.
- the re-request message may be the above-described request message or may include a message including a BSR (Buffer Status Report) for the amount of data to be transmitted to the D2D (amount of data entered into the first terminal buffer).
- BSR Buffer Status Report
- step S2260 is performed after step S2250, but as described above, step S2260 may be performed before step S2250. Or may be performed simultaneously.
- FIG. 22 illustrates a step in which the first terminal 2209 starts a timer and determines expiration.
- the base station 2201 may start the timer and determine the expiration.
- the base station 2201 may reassign radio resources and start the timer again when the re-request message is received from the first terminal before or after the timer expires.
- both the first terminal 2209 and the base station 2201 may operate the timer.
- FIG. 23 is a diagram exemplarily illustrating an SPS-Config information element according to another embodiment of the present invention.
- the SPS configuration information 2300 transmitted by the base station to the first terminal may include a semiPersistSchedC-RNTI, sps-ConfigDL, sps-ConfigUL, and D2DsemiPersistSchedC-RNTI field. That is, it may include a C-RNTI field of the SPS scheme for D2D, and may include SPS configuration information in uplink and downlink.
- FIG. 24 is a diagram illustrating an information element of the SPS-ConfigDL among the SPS-Config information elements according to another embodiment of the present invention.
- the SPS-ConfigDL field may include at least one of downlink SPS interval information, downlink SPS duration information, and group ID information.
- FIG. 25 is a diagram illustrating an information element of the SPS-ConfigUL among the SPS-Config information elements according to another embodiment of the present invention.
- the SPS-ConfigUL field may include at least one of uplink SPS interval information, implicitReleaseAfter information, twoIntervalsConfig information, and uplink SPS duration information.
- the first terminal may operate the timer by receiving the signal including the above-described information of FIGS. 23 to 25.
- the re-request message may be transmitted. If the re-request is not necessary, the first terminal terminates the D2D communication without transmitting the termination message, and the base station may recover the radio resource and use it for other purposes. Therefore, the base station can efficiently manage radio resources.
- Each field or information element that may be included in the above-described SPS configuration information of FIGS. 23 to 25 may include various information as shown in Table 4 below.
- Embodiment 2-2 Method for setting valid period when allocating direct communication radio resource between terminals.
- a valid period may be set during radio resource allocation configuration.
- FIG. 26 is a diagram illustrating a signal flow when using a timer according to another embodiment of the present invention.
- the first terminal 2609 may request a radio resource allocation or start D2D communication from the base station 2601 for D2D communication with the second terminal (S2610).
- the first terminal 2609 may include the duration information in the communication request message or the radio resource allocation message and transmit the same.
- the base station 2601 may transmit the D2D help information for D2D communication to the corresponding first terminal 2609 including the period of validity information during radio transmission or radio resource allocation information transmission (S2620).
- the base station 2601 may transmit radio resource allocation information and D2D assistance information together to the first terminal 2609, and in this case, may include transmission period validity information.
- the D2D assistance information may include one or more of D2D discovery channel information, D2D frequency information, D2D radio resource allocation information, neighbor terminal ID information, and neighbor terminal location information.
- the valid period information transmitted at this time may be the same as or different from the valid period information transmitted by the first terminal 2609 to the base station 2601 in step S2610.
- the base station 2601 may set valid period information by referring to the valid period information transmitted by the first terminal 2609 and transmit the same.
- the first terminal 2609 that has received the message of step S2620 described above starts a timer with a duration value included in the message (S2630). Thereafter, communication with the second terminal 2602 is performed using the allocated radio resource (S2640).
- the first terminal 2609 may transmit a message for re-requesting the D2D communication to the base station 2601 (S2660). For example, the first terminal 2609 may transmit a re-request message before or after the aforementioned timer expires.
- FIG. 26 illustrates a case in which step S2660 is performed after step S2650, but step S2650 may be performed after step S2660 or may be simultaneously performed.
- FIG. 26 illustrates a step in which the first terminal 2609 starts a timer and determines expiration.
- the base station 2601 may start a timer and determine expiration.
- the base station 2601 may reallocate radio resources and restart the timer when a re-request message is received from the first terminal before or after the timer expires.
- the first terminal 2609 and the base station 2601 may both operate the timer.
- the first terminal 2609 may not transmit a separate re-request message.
- the base station 2601 recovers the radio resource for other purposes. Can be used as
- the base station may broadcast the radio resource allocation information and / or valid period information for direct communication between terminals through a system information block (SIB).
- SIB system information block
- the base station may broadcast the SIB including duration information or maximum radio resource amount information for each direct communication session between terminals.
- the base station may further include priority information of direct communication between terminals.
- the first terminal may determine whether to perform D2D communication or general mobile communication through the base station based on the priority information included in the SIB.
- the SIB may include one or more information of D2D discovery frequency information, D2D frequency information, D2D radio resource duration information, and D2D priority information for D2D communication.
- information for D2D communication of the first terminal may be further included.
- the first terminal may receive D2D discovery frequency information, validity period information, priority information, and the like through the SIB, and perform D2D communication with the second terminal based on the corresponding information.
- the radio resource allocation entity may refer to an entity or a specific terminal having one or more functions of radio resource allocation, sync channel transmission, and D2D communication group management for D2D communication.
- FIG. 28 is a flowchart illustrating the operation of a first terminal according to another embodiment of the present invention.
- a radio resource allocation request for direct communication between terminals with a second terminal as a base station or a radio resource allocation entity may include transmitting a first signal including information.
- the first signal includes radio resource allocation request information for direct communication between the second terminal and the terminal, help information for direct communication between the terminals, instruction information indicating direct communication between the terminals, and direct communication between the terminals. It may include at least one information of the amount of data to be transmitted to the information, the buffer status information of the direct communication between the terminal and the validity period information in the case of the timer.
- the assistance information may include one or more pieces of data amount information to be transmitted through direct communication between terminals, data type for direct communication between terminals, neighbor terminal ID information for direct communication between terminals, DRB information to be transmitted through direct communication between terminals, and the like. May include information necessary for the first terminal of the terminal to be allocated radio resources for performing direct communication between the terminals.
- the first terminal may include receiving a second signal including radio resource allocation information from a base station or a radio resource allocation entity (S2820).
- the second signal may include radio resource allocation information.
- the second signal may further include valid period information of the radio resource.
- the second signal may further include help information for direct communication between terminals.
- the help information may include discovery radio resource information for direct communication between terminals, communication radio resource information for direct communication between terminals, neighbor terminal identification information located at a predetermined distance from the first terminal, neighbor terminal location information, and inter-terminal
- One or more pieces of information including group identification information for performing direct communication and data radio bearer information for switching to direct communication between terminals may be included.
- the second signal may be received as being included in the system information block, and may further include one or more pieces of information of valid period information of radio resources and priority information for direct communication between terminals.
- Each of the plurality of pieces of information included in the above-described second signal may be transmitted, or one or more pieces of information may be included and transmitted.
- the first terminal may include performing direct communication between the second terminal and the terminal based on the radio resource allocation information in operation S2830. That is, direct communication between terminals may be performed based on the information received through the second signal. Direct communication between terminals may refer to an operation of transmitting and receiving data and signals using at least one second terminal and allocated radio resources.
- the first terminal may include transmitting a third signal including information on a direct communication state between terminals with the second terminal (S2840).
- the third signal may include various information.
- the third signal may include one or more pieces of information indicating indication of end of direct communication between terminals and buffer status information for direct communication between terminals. That is, the terminal may include an end message indicating the end of direct communication between terminals, and may include remaining buffer state information.
- the base station can receive this and allocate radio resources for other purposes.
- the third signal may include information for requesting reallocation of the radio resource based on whether the expiration date of the radio resource expires. That is, the third signal may include re-request message information.
- the first terminal when it does not need any more radio resources, it may not be transmitted.
- the aforementioned radio resource allocation entity may mean a radio resource allocation entity that performs at least one of radio resource allocation for direct communication between terminals, sink channel transmission, and group management for direct communication between terminals.
- the first terminal can perform all the operations necessary for the above-described embodiments of the present invention.
- 29 is a flowchart illustrating the operation of a base station according to another embodiment of the present invention.
- a method for controlling direct communication between terminals by a base station comprising receiving a first signal including radio resource allocation request information for direct communication between terminals from a first terminal; It may be (S2910).
- the first signal may include at least one or more information of radio resource allocation request information for direct communication between terminals, assistance information for direct communication between terminals, and valid period information in the case of a timer.
- the assistance information may include one or more pieces of data amount information to be transmitted through direct communication between terminals, data type for direct communication between terminals, neighbor terminal ID information for direct communication between terminals, DRB information to be transmitted through direct communication between terminals, and the like. May include information necessary for the first terminal of the terminal to be allocated radio resources for performing direct communication between the terminals.
- the base station may include transmitting a second signal including radio resource allocation information (S2920).
- the second signal may include radio resource allocation information.
- the second signal may further include valid period information of the radio resource.
- the second signal may further include help information for direct communication between terminals.
- the help information may include discovery radio resource information for direct communication between terminals, communication radio resource information for direct communication between terminals, neighbor terminal identification information located at a predetermined distance from the first terminal, neighbor terminal location information, and inter-terminal
- One or more pieces of information including group identification information for performing direct communication and data radio bearer information for switching to direct communication between terminals may be included.
- the second signal may be included in the system information block and transmitted.
- the second signal may further include one or more pieces of information on the validity period of the radio resource and priority information on the direct communication between the terminals.
- Each of the plurality of pieces of information included in the above-described second signal may be transmitted, or one or more pieces of information may be included and transmitted.
- the base station may include receiving a third signal including information on a direct communication state between terminals from the first terminal (S2930).
- the third signal may include various information.
- the third signal may include one or more pieces of information indicating indication of end of direct communication between terminals and buffer status information for direct communication between terminals. That is, the terminal may include an end message indicating the end of direct communication between terminals, and may include remaining buffer state information.
- the base station can receive this and allocate radio resources for other purposes.
- the third signal may include information for requesting reallocation of the radio resource based on whether the expiration date of the radio resource expires. That is, the third signal may include re-request message information.
- the first terminal when the first terminal does not need any more radio resources, it may not be received.
- the base station may perform all the operations necessary for the above-described embodiments of the present invention.
- the base station may further include operating an expiration timer such as assigned SPS configuration information and radio resource allocation information.
- the second signal may further include SPS configuration information as radio resource allocation information.
- step of the first terminal and the base station described above may be combined into one step or some steps within the scope of the present invention, and one step may be divided into two or more steps. In addition, the order of the steps may be reversed. In addition, one or more steps may be omitted.
- each of the above-described embodiments may constitute one embodiment by combining specific configurations or embodiments with each other, and each of the embodiments may be performed by one embodiment.
- the base station or the radio resource allocation entity can efficiently allocate radio resources used for direct communication between terminals in order to efficiently manage radio resources of the mobile communication network.
- the base station or the entity allocating radio resources allocates radio resources for direct communication between terminals
- information on whether the allocated radio resources are used for efficient radio resource allocation or distribution may be obtained from the first terminal. It has an effect.
- the terminal may communicate with the target terminal using radio resources. Accordingly, it is necessary to allocate radio resources according to the terminal performing direct communication between terminals. In addition, the terminal may be required to find a target terminal to be the target of direct communication between the terminals. To this end, if a discovery procedure for direct communication between terminals is required, allocation of radio resources for discovery is required.
- the following method may be used for the direct communication discovery radio resource allocation method between terminals. For example, a method of allocating radio resources to a terminal group or the entire terminal for direct communication between terminals may be considered. As another example, a method of allocating radio resources for each terminal for direct communication between terminals may be considered. Specifically, the method for allocating radio resources for each terminal may be a method for allocating radio resources whenever each transmission request occurs. Alternatively, the method may be a radio resource allocation method according to the semi-persistent method described above.
- the radio resource allocation entity may mean an entity that performs at least one of radio resource allocation for direct communication between terminals, sink channel transmission, and group management for direct communication between terminals. That is, the radio resource allocation entity may be called in various terms such as a cluster head, a central control entity, a central entity, for example, using D2D communication. From a functional point of view, it refers to an entity that partially plays the role of a base station, such as radio resource allocation, transmission of a sync channel, or D2D group management when terminals are located outside the coverage of the aforementioned D2D communication scenario.
- a base station will be mainly described as an example, but the operation of including the aforementioned radio resource allocation entity in place of the base station is also included in the scope of the present invention.
- the base station needs to know the direct communication state between the terminals of the terminals that are currently made in its coverage. Through this, the base station may adjust and allocate radio resources based on state information of direct communication between terminals. That is, the base station can efficiently manage limited radio resources, and the terminal can be allocated an appropriate amount of radio resources for the direct communication between the terminals, thereby efficiently performing the direct communication between the terminals.
- FIG. 30 is a diagram illustrating operations of a terminal and a base station according to an embodiment of the present invention.
- a method for transmitting a direct communication status report between terminals receiving a first signal including direct communication setting information between terminals from a base station or a radio resource allocation entity and trigger condition information
- the method may include determining a trigger of the direct communication status report between terminals based on the request, and transmitting a second signal including the direct communication status report between the terminals to a base station or a radio resource allocation entity.
- the base station or the radio resource allocation entity 3001 transmits a first signal including direct communication setting information between terminals to the terminal 3009 (S3010).
- the direct communication setting information between the terminals may include setting information necessary for the terminal to perform direct communication between the terminals and to report the direct communication state between the terminals.
- the direct communication setting information between terminals may include radio resource allocation information for direct communication between terminals.
- the direct communication setting information between terminals may include setting information for reporting a direct communication status between terminals.
- the radio resource allocation information for the direct communication between the terminals and the direct communication status report setting information between the terminals may be included.
- the first signal transmitted from the base station or the radio resource allocation entity 3001 to the terminal 3009 may be transmitted in a system information block (System Information Block, SIB) or higher layer signaling.
- SIB System Information Block
- Higher layer signaling may be RRC signaling.
- the terminal 3009 may check the trigger of the direct communication status report between the terminals based on the trigger condition information (S3020).
- the trigger condition information may be included in the aforementioned first signal and transmitted.
- the terminal 3009 may be set in advance. For example, when the terminal 3009 receives the first signal and performs direct communication between terminals, the direct communication status report between terminals may be triggered when a direct communication transmission failure between terminals occurs. Alternatively, a direct communication status report between terminals may be triggered based on a certain number of times or a predetermined period of time. Alternatively, trigger condition information may be set at regular intervals.
- the trigger condition information may be included in the direct communication setting information between terminals of the first signal and received by the terminal 3009 or may be set in advance in the terminal 3009. Alternatively, parameter information related to a status report criterion may be transmitted to the terminal 3009, and the terminal 3009 may check the trigger based on the corresponding parameter information.
- the terminal 3009 may transmit a second signal including a direct communication status report between the terminals to the base station or the radio resource allocation entity 3001.
- the direct communication status report between terminals may include discovery failure related information or direct communication failure related information between terminals for direct communication between terminals.
- the second signal may include at least one of information related to the target terminal, information related to the amount of data to be transmitted / received through direct communication between terminals, data transmission success rate information, and information related to group communication. It may include.
- the terminal may include various information such as time and location information for direct communication between the terminals.
- the second signal reports whether the direct communication between terminals, the number of direct communication terminals between terminals, the number of direct communication sessions between terminals, reports the number of failed attempts to transmit a direct communication discovery message between terminals, and direct communication data between terminals.
- the information may be included in the direct communication status report between the terminals.
- the base station or the radio resource allocation entity 3001 may receive a second signal from the terminal 3009 and adjust the amount of radio resource allocation based on the above-described communication status report information between the terminals.
- 31 is a diagram illustrating operations of a terminal and a base station according to another embodiment of the present invention.
- the base station 3101 transmits direct communication setting information between terminals in order to know a direct communication state between terminals (S3110).
- the corresponding terminal direct communication configuration information may be transmitted through SIB or higher layer signaling.
- the SIB may transmit the direct communication status report setting information between terminals, such as the number of direct communication terminals, the number of direct communication sessions between terminals, and the number of failed direct communication attempts between terminals.
- the base station 3101 may transmit the status report setting information along with the direct communication discovery radio resource allocation information between the terminals in an RRC message to the terminal 3109 which desires direct communication between the terminals.
- FIG. 7 is a diagram illustrating an example of information that may be included in direct communication setting information between terminals according to another embodiment of the present invention.
- the direct communication setting information between terminals transmitted from the base station 3101 to the terminal 3109 may include information related to D2D radio resource allocation information and information related to D2D communication status report setting information, as shown in FIG. 7.
- the D2D has been described as an example, but may be applied to all cases in which direct communication between terminals is performed.
- the terminal 3109 may transmit and receive a direct communication discovery message between terminals with the target terminal 3102 according to the direct communication setting information between the terminals (S3120).
- the discovery message performs a function for searching for the target terminal 3102 and performing a preparation task for performing communication before the terminal 3109 performs direct communication between the terminals.
- the terminal 3109 When the terminal 3109 successfully transmits and receives a direct communication discovery message between terminals, the terminal 3109 performs communication between terminals using radio resources allocated from the base station 3101 (S3130).
- the terminal 3109 in communication between terminals may determine whether to trigger a direct communication status report between terminals based on the above-described direct communication setting information between terminals.
- the trigger satisfaction may be checked based on the trigger condition information preset in the terminal 3109. If the terminal 3109 checks whether the trigger is satisfied and satisfies the trigger condition, the terminal 3109 transmits a direct communication status report between the terminals to the base station 3101 (S3140).
- the terminal 3109 may transmit the direct communication status report between the terminals. That is, the terminal may transmit a direct communication status report between the terminals according to the request of the base station.
- the trigger condition information may be whether the base station receives a request message transmitted to the terminal.
- 33 is a diagram illustrating an example of information that may be included in direct communication status report information between terminals according to another embodiment of the present invention.
- the above-described direct communication status report between terminals may include a plurality of pieces of information related to direct communication between terminals as illustrated in FIG. 33.
- FIG. 33 exemplarily shows information included in a direct communication status report between terminals in the case of D2D as an example of direct communication between terminals.
- the direct communication status report between terminals may include various information necessary for the base station to allocate radio resources such as location information related to direct communication between terminals.
- the base station may adjust the radio resource allocation of the terminal based on the received direct communication status report between the terminals. For example, an operation such as terminating or additionally allocating a radio resource may be performed.
- Second Embodiment An attempt to transmit a direct communication discovery message between terminals fails
- 34 is a diagram illustrating operations of a terminal and a base station in case of direct communication discovery failure between terminals according to another embodiment of the present invention.
- the terminal 3409 When the terminal 3409 attempts to transmit a direct communication discovery message between terminals, if the terminal fails for a predetermined time or fails a predetermined number of times, the terminal 3409 stops the transmission of the discovery and reports a failure report including information on the number of failures and the duration of the failure. Report to the base station.
- the base station 3401 may transmit discovery message transmission setting information for direct communication between terminals to the terminal 3410.
- the discovery message transmission setting information may include at least one of radio resource allocation information, maximum discovery message transmission attempt information and maximum discovery message transmission attempt time information.
- the discovery message transmission setting information may be included in the direct communication setting information between the terminals described with reference to FIG. 30. Thus, it may be transmitted through an SIB or RRC message.
- the terminal 3409 attempts to transmit a discovery message using the corresponding radio resource based on discovery message transmission configuration information that may be included in the direct communication configuration information received from the base station 3401.
- the discovery message transmission of the terminal 3409 may fail. For example, when a plurality of terminals attempt to transmit a discovery message using the same radio resource, the discovery message transmission may fail (S3420).
- the terminal 3409 that fails to transmit the discovery message may retransmit the discovery signal using the same or different radio resource after a certain time.
- information such as a predetermined time or the number of retransmissions may be included in the discovery message transmission setting information.
- the value may be preset in the terminal.
- the UE 3407 may fail again (S3425).
- the terminal 3407 checks a trigger condition for transmitting discovery failure related information to the base station 3401 (S3430).
- the trigger condition may be included in the direct communication setting information between terminals or may be set in advance in the terminal.
- the trigger condition is that the discovery message transmission attempt of the terminal fails more than a certain number of times, the transmission attempt fails for a predetermined time, satisfies the period set to report periodically, and the report request message is received from the base station It may include any one of the case.
- the terminal 3407 transmits discovery failure related information for direct communication between the terminals to the base station 3401 (S3440).
- the discovery failure related information may be included in the direct communication status report between terminals described with reference to FIG. 30 and transmitted.
- the discovery failure related information may include various information such as information on the cause of the discovery failure of the terminal.
- the discovery failure related information may include one or more of the following information.
- the number of failed discovery message transmission attempts may include information related to the number of failed discovery message transmission attempts for a predetermined time from the base station or a preset time in the terminal.
- Discovery message transmission attempt failure time may include the time information from the first failed attempt to send the discovery message to the present or time information from the first failure to just before the first success.
- Location information of the terminal may include the current location information of the terminal.
- Current location information of the terminal may be obtained from a positioning system such as GPS or GNSS.
- the serving cell and / or neighbor cell measurement information measured according to the measurement operation of the terminal may be included.
- Identification information of a direct communication group between terminals to which the terminal belongs may include identification information used for communication of a group (eg, a D2D group) in direct communication between terminals.
- the identification information may be a specific value used to distinguish a group, such as an identifier or an index.
- Data amount for direct communication transmission between terminals This may include buffer information related to direct communication between terminals.
- the base station 3401 may perform an operation of reassigning radio resources or changing and allocating radio resources based on the received discovery failure related information.
- FIG. 10 is a diagram illustrating operations of a terminal and a base station when a direct communication between terminals fails in accordance with another embodiment of the present invention.
- FIG. 10 is a diagram illustrating an example in which a UE successfully transmits or receives a discovery message but fails to transmit data. In this case, the terminal transmits direct communication failure related information between terminals related to the failure of data transmission to the base station.
- the terminal 3509 wishing to transmit the direct communication between the terminals may receive the direct communication setting information between the terminals from the base station 3501 (S3510).
- the direct communication setting information between the terminals may include radio resource allocation information for the direct communication between the terminals and the discovery message transmission setting information described above.
- the terminal 3509 may attempt to transmit and receive data by selecting some or all of radio resources allocated for direct communication between the terminals.
- the radio resource information may be included in a direct communication discovery message between terminals transmitted and received by the terminal 3509.
- the base station 3501 may be included in the direct communication configuration information between terminals received through SIB or higher layer signaling from the base station 3501.
- the terminal 3509 may attempt to transmit and receive data for direct communication between the terminals, in which case it may fail (S3520). When a failure occurs in data transmission and reception, the terminal 3509 may attempt to transmit by selecting a radio resource again after a predetermined time (S3525).
- the predetermined time information for retransmission of data by the terminal 3509 may be included in the direct communication setting information between the terminals, or may be a value preset in the terminal.
- the terminal 3509 may check whether a trigger condition is satisfied when direct communication data transmission and reception between terminals fail. For example, the transmission of the information related to the direct communication failure between terminals may be performed when the data transmission attempt fails more than a predetermined number of times, when the transmission attempt fails for a predetermined time, when the periodic reporting is satisfied, and the base station request message. May be triggered in any one of the cases where is received.
- the terminal 3509 may transmit the corresponding information to the base station 3501 (S3540).
- the terminal-to-terminal direct communication failure related information may be included in the aforementioned direct communication status report between the terminals and transmitted.
- the information on the direct communication failure between terminals may include the following information.
- the number of failed direct communication data transmission attempts between terminals may include information related to the number of failed data transmission attempts during a predetermined time or a preset time from the base station.
- the information may include period information from first failure to direct communication data transmission attempt between terminals, or period information from first failure to just before success.
- Location information of the terminal may include the current location information of the terminal.
- Current location information of the terminal may be obtained from a positioning system such as GPS or GNSS.
- serving cell and / or neighbor cell measurement information measured by the terminal may be included.
- Identification information of the direct communication group between terminals to which the terminal belongs The terminal may include identification information used for communication of the direct communication group between the terminals in communication.
- the identification information may be a specific value used to distinguish a group, such as an identifier or an index.
- Data amount for direct communication transmission between terminals This may include buffer information related to direct communication between terminals.
- the base station 3501 may perform an operation of reassigning a radio resource or changing and assigning a radio resource based on the received direct communication failure related information between terminals.
- the base station can efficiently allocate radio resources by receiving a communication status report between terminals received from the terminal. That is, the base station may allocate radio resources for the terminal-to-terminal communication based on the necessity and state information of the direct communication between the terminals within its coverage. Accordingly, the base station can efficiently allocate and manage radio resources.
- the terminal can increase the success rate of the direct communication between terminals by correctly allocated the radio resources necessary for the communication between the terminals.
- 36 is a flowchart illustrating the operation of a terminal according to another embodiment of the present invention.
- the terminal In a method for transmitting a direct communication status report between terminals, the terminal according to another embodiment of the present invention, receiving a first signal including direct communication setting information between terminals from a base station or a radio resource allocation entity and a trigger condition Identifying a trigger of the direct communication status report between terminals based on the information and transmitting a second signal including the direct communication status report between terminals to a base station or a radio resource allocation entity.
- the terminal receives a first signal from a base station or a radio resource allocation entity (S3610).
- the first signal may include direct communication setting information between terminals.
- the first signal may include radio resource allocation information necessary for the terminal to perform direct communication between the terminals, and may include setting information for reporting a direct communication status between terminals.
- the first signal may include the discovery message transmission setting information described above.
- the first signal may be received by SIB or higher layer signaling.
- higher layer signaling may be RRC signaling.
- the terminal may attempt direct communication between the terminals by receiving the first signal. That is, the terminal may transmit a discovery message for direct communication between terminals, and may transmit data.
- the terminal may monitor the trigger of the direct communication status report between the terminals on the basis of the trigger condition information (S3620).
- the trigger condition may be included in the first signal and received. Or it may be set in advance in the terminal. Alternatively, whether the trigger condition is satisfied may be determined according to whether a request message from the base station is received.
- the terminal may transmit a second signal including the communication status report between the terminals to the base station or the radio resource allocation entity (S3630).
- the terminal may transmit the second signal according to whether the communication between the terminals succeeds or fails to transmit or receive a discovery message or fails to transmit data.
- the second signal may include information related to communication between terminals.
- it may include discovery failure related information or direct communication failure related information between terminals.
- all three types of information may be included or at least two or more types of information may be included.
- the above-mentioned radio resource allocation entity may include a base station, and may perform an entity that performs one or more functions of radio resource allocation for direct communication between terminals, a sink channel transmission, and a terminal group for performing direct communication between terminals. Can mean.
- FIG. 37 is a flowchart illustrating the operation of a base station according to another embodiment of the present invention.
- the base station In a method for receiving a direct communication status report between terminals, the base station according to another embodiment of the present invention, generating a first signal including the direct communication setting information between terminals and transmitting the first signal to the terminal; And receiving a second signal including a direct communication status report between terminals from the terminal.
- the base station may generate a first signal including direct communication setting information between terminals for transmission to the terminal (S3710).
- the first signal may include radio resource allocation information necessary for the terminal to perform direct communication between the terminals, and may include setting information for reporting a direct communication status between terminals.
- the first signal may include the discovery message transmission setting information described above.
- the base station transmits the generated first signal to the terminal (S3720).
- the first signal may be transmitted by SIB or higher layer signaling.
- higher layer signaling may be RRC signaling.
- the base station may receive a second signal (S3730).
- the base station may transmit trigger condition information in the first signal.
- the terminal may transmit a request message for requesting transmission of a direct communication status report between terminals.
- the terminal may determine that the trigger condition is satisfied and transmit the second signal.
- the second signal may include various pieces of information depending on whether the communication between the terminals is successful, whether the discovery message has not been transmitted or received, or whether the data transmission has failed.
- the second signal may include information related to the terminal-to-terminal communication as shown in FIG. 33.
- it may include discovery failure related information or direct communication failure related information between terminals.
- all three types of information may be included or at least two or more types of information may be included.
- the base station may determine the radio resource allocation by receiving the second signal including the aforementioned direct communication status report between the terminals. Alternatively, the base station may determine to change the allocated radio resource.
- the terminal and the base station can perform all the embodiments of the present invention through the operation described above.
- 38 is a diagram illustrating a configuration of a first terminal according to another embodiment of the present invention.
- the first terminal 3800 includes a control unit 3810 and a buffer status report for triggering a buffer status report (BSR) for direct communication between the second terminal and the terminal.
- the controller 3810 triggers a buffer status report for allocating radio resources for performing direct communication between terminals with a second terminal, which is necessary to perform all the above-described embodiments of the present invention. And configuring the buffer status report and controlling the operation of the first terminal according to the transmission.
- the controller 3810 may request a radio resource from the second terminal to perform direct communication between the first terminal and the terminal. Is received, when data for direct communication between terminals having a higher priority enters the buffer, when data for direct communication between terminals enters the buffer, data for direct communication between terminals exists in the buffer and is retransmitted.
- the buffer status report may be triggered when at least one of the cases when the timer expires and when the timer for transmitting the buffer status report expires.
- the controller 3810 may configure a buffer status report transmitted to a base station or a radio resource allocation entity, and may be distinguished from a logical channel identity index value for communication with the base station. It may be controlled to include a logical channel identifier index value.
- the terminal when the terminal configures the D2D connection with the plurality of terminals, it may be controlled to include the D2D connection identifier index value in the buffer status report. Alternatively, it may be controlled to include both the logical channel identifier index value and the D2D connection identifier index value, or to include a separate index value defining both values.
- the controller 3810 may control to include buffer status information on a logical channel for communication with a base station and a logical channel for direct communication between terminals.
- a logical channel for direct communication between terminals may be allocated to a logical channel group which is distinguished from a logical channel for communication with a base station.
- the transmitter 3820 may transmit a buffer status report to the base station or the radio resource allocation entity. That is, as described above, in performing direct communication between the second terminal and the terminal, the buffer status report may be transmitted to the base station or the radio resource allocation entity instead of the second terminal.
- the receiver 3830 may receive a signal including radio resource allocation information for performing direct communication between terminals with the second terminal from the base station or the radio resource allocation entity.
- the transmitter 3820 and the receiver 3830 may transmit and receive signals, data, and messages with the base station, and may transmit and receive signals and data through direct communication between the second terminal and the terminal.
- the configuration of the first terminal in the radio resource allocation method of the present invention is as follows.
- the first terminal 3800 includes a controller 3810, a transmitter 3820, and a receiver 3830.
- the controller 3810 may control the overall operation according to the operation of reporting to the base station whether to request and terminate the radio resource required for performing the direct communication between the terminal and the second terminal required to perform the present invention. 1 Controls the operation of the terminal.
- the first terminal 3800 performing direct communication between terminals of the present invention is a base station or a radio resource allocation entity, and includes a radio resource allocation request information for direct communication between the second terminal and the terminal.
- Direct communication between the second terminal and the terminal based on a transmitter 3820 for transmitting a signal, a receiver 3830 for receiving a second signal including radio resource allocation information from a base station or a radio resource allocation entity, and radio resource allocation information It may include a control unit 3810 to perform the.
- the transmitter 3820 may further transmit a third signal including information on a direct communication state between terminals with the second terminal.
- the transmitter 3820 and the receiver 3830 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention with a base station, a radio resource allocation entity, or a second terminal that is the target of direct communication between terminals. .
- the transmitter 3830 may include radio resource allocation request information for direct communication between terminals with a second terminal, help information for direct communication between terminals, indication information for instructing direct communication between terminals, and between terminals.
- the first signal may include at least one of information on the amount of data to be transmitted in the direct communication, buffer status information of the direct communication between terminals, and valid period information in the case of a timer.
- the assistance information may include one or more pieces of data amount information to be transmitted through direct communication between terminals, data type for direct communication between terminals, neighbor terminal ID information for direct communication between terminals, DRB information to be transmitted through direct communication between terminals, and the like. May include information necessary for the first terminal of the terminal to be allocated radio resources for performing direct communication between the terminals.
- the receiver 3830 may receive a second signal including radio resource allocation information according to each embodiment.
- the second signal may further include valid period information of the radio resource.
- the second signal may further include help information for direct communication between terminals.
- the help information may include discovery radio resource information for direct communication between terminals, communication radio resource information for direct communication between terminals, neighbor terminal identification information located at a predetermined distance from the first terminal, neighbor terminal location information, and inter-terminal One or more pieces of information including group identification information for performing direct communication and data radio bearer information for switching to direct communication between terminals may be included.
- the receiver 3830 may receive the second signal through the system information block, and may further include one or more pieces of information on the validity period of the radio resource and priority information on the direct communication between the terminals.
- Each of the plurality of pieces of information included in the above-described second signal may be transmitted, or one or more pieces of information may be included and transmitted.
- the transmitter 3820 may transmit a third signal including various information according to each embodiment.
- the third signal may include one or more pieces of information indicating indication of end of direct communication between terminals and buffer status information for direct communication between terminals. That is, the terminal may include an end message for notifying end of direct communication between terminals with the second terminal, and may include remaining buffer state information.
- the base station can receive this and allocate radio resources for other purposes.
- the third signal may include information for requesting reallocation of the radio resource based on whether the expiration date of the radio resource expires. That is, the third signal may include re-request message information.
- the first terminal when it does not need any more radio resources, it may not be transmitted.
- the aforementioned radio resource allocation entity may mean a radio resource allocation entity that performs at least one of radio resource allocation for direct communication between terminals, sink channel transmission, and group management for direct communication between terminals.
- the first terminal can perform all the operations necessary for the above-described embodiments of the present invention.
- the configuration of the terminal in the communication status reporting method of the present invention is as follows.
- Terminal 3800 is a direct connection between the terminal on the basis of the trigger condition information and the receiver 3830 for receiving the first signal including the direct communication setting information between the terminal from the base station or radio resource allocation entity;
- the control unit 3810 may identify a trigger of the communication status report, and a transmitter 3820 may transmit a second signal including a direct communication status report between terminals to a base station or a radio resource allocation entity.
- the controller 3810 controls the overall operation of the terminal required to confirm and transmit the trigger of the direct communication status report between the terminals necessary to perform the above-described present invention. For example, the controller 3810 may determine whether to trigger a direct communication status report between terminals based on trigger condition information received from the base station or preset in the terminal. In addition, the controller 3810 may control an operation for performing direct communication between the target terminal and the terminal.
- the transmitter 3820 may transmit a second signal to a base station or a radio resource allocation entity.
- the direct communication status report between terminals included in the second signal may include various information according to the above-described embodiments.
- the second signal may include information related to communication between terminals.
- it may include discovery failure related information or direct communication failure related information between terminals.
- all three types of information may be included or at least two or more types of information may be included.
- the transmitter 3820 may transmit data and signals through direct communication between the target terminal and the terminal.
- the receiver 3830 receives a first signal including direct communication setting information between terminals from a base station or a radio resource allocation entity.
- the first signal received by the receiver 3830 may include radio resource allocation information necessary for the terminal to perform direct communication between terminals, and may include setting information for reporting a direct communication status between terminals. It may be.
- the first signal may include the discovery message transmission setting information described above.
- the first signal may be received by SIB or higher layer signaling.
- higher layer signaling may be RRC signaling.
- the transmitter 3820 and the receiver 3830 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention with a base station or a target terminal.
- 39 is a diagram showing the configuration of a base station according to another embodiment of the present invention.
- the base station 3900 is a receiving unit for receiving a buffer status report from the first terminal when the buffer status report (Buffer Status Report, BSR) of the first terminal for direct communication between terminals ( 3930) and a transmitter 3920 for transmitting radio resource allocation information for direct communication between terminals based on the buffer status report.
- BSR Buffer Status Report
- the controller 3910 receives a buffer status report including buffer information for direct communication between terminals from a first terminal necessary to perform all the above-described embodiments of the present invention, thereby directly communicating between terminals. It is possible to control the operation of the base station 3900 according to the allocation of radio resources for.
- the controller 3910 may allocate a logical channel for direct communication between terminals to a logical channel group that is distinct from the logical channel for communication with a base station. That is, in the merged transmission situation of the buffer status report according to the above-described second embodiment, it is possible to control not to allocate each logical channel to the same logical channel group in order to distinguish communication between the base station and direct communication between terminals.
- the receiver 3930 may receive a buffer status report from the first terminal.
- the buffer status report may include a logical channel identifier index value for direct communication between terminals, which is distinguished from a logical channel identity index value for communication with a base station. That is, a dedicated buffer status report for direct communication between terminals may be set and received.
- the buffer status report may include the D2D connection identifier index value.
- both the logical channel identifier index value and the D2D connection identifier index value may be included, or a separate index value defining both values may be included.
- the buffer status report includes buffer status information on a logical channel for communication with a base station and a logical channel for direct communication between terminals, wherein the logical channel for direct communication between terminals is a logic for communication with a base station. It may be assigned to a logical channel group that is distinct from the channel. That is, in the case where the buffer status reports of the direct communication between the terminals and the communication through the base station are merged and received, a logical channel for direct communication between terminals may be allocated to a specific logical channel group. Through this, the base station can distinguish the logical channel group through the base station and the logical channel group for direct communication between the terminal even if the received buffer status report is merged. Accordingly, buffer information for direct communication between terminals may be classified and radio resources may be allocated based on this.
- the transmitter 3920 may transmit radio resource allocation information to the first terminal.
- the radio resource allocation information transmitted by the base station 3900 may be information configured based on the buffer status report received in the manner of each embodiment described above. For example, when the first terminal transmits a buffer status report including information on the amount of data for direct communication between terminals in order to perform direct communication between the second terminal and the terminal, the base station through each of the above-described embodiments This can be confirmed by reporting the configured buffer status. Thereafter, the base station may allocate an appropriate radio resource based on the information on the data amount of the first terminal for direct communication between the terminals.
- the transmitter 3920 may transmit downlink data, signals, and messages to the first terminal.
- the receiver 3930 may further receive uplink data, signals, and messages from the first terminal.
- the configuration of the base station in the radio resource allocation method of the present invention is as follows.
- the base station 3900 includes a receiver 3930, a controller 3910, and a transmitter 3920.
- the control unit 3910 allocates radio resources for direct communication between terminals necessary for carrying out the above-described invention, and manages radio resources by recognizing end of direct communication between terminals with a second terminal of a first terminal. To control the overall operation of the base station.
- the base station 3900 is a receiver 3930 for receiving a first signal including radio resource allocation request information for direct communication between terminals from the first terminal and wireless
- the transmission unit 3920 may transmit a second signal including the resource allocation information.
- the receiving unit 3930 may further receive a third signal including information on a direct communication state between terminals with the second terminal from the first terminal.
- the receiver 3930 includes at least one information including radio resource allocation request information for direct communication between terminals, help information for direct communication between terminals, and valid period information in the case of a timer according to each of the above-described embodiments. 1 signal can be received.
- the assistance information may include one or more pieces of data amount information to be transmitted through direct communication between terminals, data type for direct communication between terminals, neighbor terminal ID information for direct communication between terminals, DRB information to be transmitted through direct communication between terminals, and the like. May include information necessary for the first terminal of the terminal to be allocated radio resources for performing direct communication between the terminals.
- the transmitter 3920 may include radio resource allocation information in the second signal, according to each embodiment.
- the second signal may further include valid period information of the radio resource.
- the second signal may further include help information for direct communication between terminals.
- the help information may include discovery radio resource information for direct communication between terminals, communication radio resource information for direct communication between terminals, neighbor terminal identification information located at a predetermined distance from the first terminal, neighbor terminal location information, and inter-terminal One or more pieces of information including group identification information for performing direct communication and data radio bearer information for switching to direct communication between terminals may be included.
- the second signal may be included in the system information block and transmitted.
- the second signal may further include one or more pieces of information on the validity period of the radio resource and priority information on the direct communication between the terminals.
- Each of the plurality of pieces of information included in the above-described second signal may be transmitted, or one or more pieces of information may be included and transmitted.
- the receiver 3930 may include various information as the third signal according to each embodiment.
- the receiver 3930 may include one or more pieces of information indicating command termination of direct communication between terminals as a third signal and buffer status information for direct communication between terminals. That is, the terminal may include an end message indicating the end of direct communication between terminals, and may include remaining buffer state information.
- the base station can receive this and allocate radio resources for other purposes.
- the third signal may include information for requesting reallocation of the radio resource based on whether the expiration date of the radio resource expires. That is, the third signal may include re-request message information.
- the first terminal when the first terminal does not need any more radio resources, it may not be received.
- controller 3910 may perform all the operations necessary for the above-described embodiments of the present invention.
- the controller 3910 may control to operate an expiration timer such as assigned SPS configuration information and radio resource allocation information.
- the transmitter 3920 may further include SPS configuration information as radio resource allocation information in the second signal.
- the receiver 3930 receives uplink control information, data, and a message from a first terminal through a corresponding channel.
- the transmitter 3920 transmits downlink control information, data, and a message to a first terminal through a corresponding channel.
- the configuration of the base station in the communication status reporting method of the present invention is as follows.
- the base station 3900 includes a control unit 3910 for generating a first signal including direct communication setting information between terminals, a transmitter 3920 for transmitting the first signal to the terminal, and a terminal from the terminal. And a receiver 3930 for receiving a second signal including a direct communication status report.
- the controller 3910 generates and transmits the terminal-to-device communication setting information to be transmitted to the terminal, and receives the terminal-to-device communication status report from the terminal to control the overall operation of the base station required for allocating radio resources.
- the controller 3910 may generate communication setting information between terminals.
- the first signal may include radio resource allocation information necessary for the terminal to perform direct communication between the terminals, and may include setting information for reporting a direct communication status between terminals. Additionally, the first signal may include the discovery message transmission setting information described above.
- controller 3910 may control an operation related to radio resource allocation for direct communication between terminals.
- a radio resource may be allocated or changed based on a direct communication status report between terminals.
- the transmitter 3920 may transmit the generated first signal to the terminal.
- the first signal may be transmitted by SIB or higher layer signaling.
- the receiver 3930 may receive a second signal including a direct communication status report between terminals from the terminal.
- the second signal may include various information depending on whether the communication between the terminals is successful, whether the discovery message has been transmitted or received, or whether the data transmission has failed.
- the second signal may include information related to communication between terminals.
- it may include discovery failure related information or direct communication failure related information between terminals.
- all three types of information may be included or at least two or more types of information may be included.
- the transmitter 3920 and the receiver 3930 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention.
- the present invention provides a method and apparatus for transmitting a buffer status report including information on the amount of data to be transmitted in a direct communication between terminals when the first terminal performs direct communication between the second terminal and the terminal. Suggest.
- Dedicated buffer status information related to direct communication between terminals may be defined and transmitted, or may be classified by dividing a logical channel from a logical channel for data transmission and reception through an existing base station and assigning the logical channel to a logical channel group.
- the base station receives the buffer status report according to the method described above, and may allocate radio resources based on the amount of data for direct communication between terminals. Therefore, the radio resources used for the communication through the base station and the radio resources used for the direct communication between the terminals can be clearly distinguished and effectively distributed and managed.
- the present invention can be applied to a case where the base station dynamically schedules radio resources of direct communication between terminals or semi-permanently schedules the radio resources.
- dynamic scheduling and semi-persistent scheduling it may be applied to a case where fixed resources are not allocated and dynamically adjusted for direct communication between terminals. That is, even if the base station does not adjust the radio resources according to the usage state of the direct communication between the terminals, the information may be received through the buffer status report because it is necessary to check and collect the information on the data amount through the direct communication between the terminals. have.
- the present invention described above may be applied regardless of a specific method of allocating radio resources for direct communication between terminals by a base station.
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Abstract
Description
Claims (20)
- 제 1 단말이 제 2 단말과 단말 간 직접 통신을 수행하는 방법에 있어서,상기 제 2 단말과의 단말 간 직접 통신을 위한 버퍼상태보고(Buffer Status Report, BSR)가 트리거 되는 단계;상기 버퍼상태보고를 기지국 또는 무선자원할당 개체로 전송하는 단계; 및상기 기지국 또는 상기 무선자원할당 개체로부터 상기 단말 간 직접 통신을 위한 무선 자원 할당 정보를 수신하는 단계를 포함하는 방법.
- 제 1항에 있어서,상기 버퍼상태보고는,상기 제 1 단말이 상기 단말 간 직접 통신을 개시하는 경우, 상기 단말 간 직접 통신을 시작한 경우, 상기 제 1 단말과 상기 단말 간 직접 통신을 수행하려는 상기 제 2 단말로부터 상기 무선 자원 요청이 수신되는 경우, 더 높은 우선순위를 갖는 상기 단말 간 직접 통신을 위한 데이터가 버퍼에 들어온 경우, 상기 단말 간 직접 통신을 위한 데이터가 버퍼에 들어온 경우, 상기 버퍼에 상기 단말 간 직접 통신을 위한 데이터가 존재하고 재전송 타이머가 만료된 경우 및 상기 버퍼상태보고를 전송하기 위한 타이머가 만료된 경우 중 적어도 어느 하나의 경우가 발생한 경우에 트리거 되는 방법.
- 제 1항에 있어서,상기 무선자원할당 개체는,상기 제 2 단말과의 단말 간 직접 통신을 위한 무선 자원 할당, 싱크 채널 전송 및 상기 단말 간 직접 통신을 수행하는 단말 그룹을 관리하는 기능 중 적어도 하나의 기능을 수행하는 방법.
- 제 1항에 있어서,상기 버퍼상태보고는,상기 기지국과의 통신을 위한 논리채널 식별자(Logical Channel Identity) 인덱스 값과 구분되는, 상기 단말 간 직접 통신을 위한 논리채널 식별자 인덱스 값을 포함하는 방법.
- 제 1항에 있어서,상기 버퍼상태보고는,적어도 하나 이상의 상기 단말 간 직접 통신을 구분하기 위한 단말 간 직접 통신 연결 식별자 인덱스 값을 포함하는 방법.
- 제 1항에 있어서,상기 버퍼상태보고는,상기 기지국과의 통신을 위한 논리 채널 및 상기 단말 간 직접 통신을 위한 논리채널에 대한 버퍼상태정보를 포함하되,상기 단말 간 직접 통신을 위한 논리채널은 상기 기지국과의 통신을 위한 논리 채널과 구분되는 논리채널그룹(Logical Channel Group)에 할당되는 방법.
- 기지국이 단말 간 직접 통신을 제어하는 방법에 있어서,상기 단말 간 직접 통신을 위한 제 1 단말의 상기 버퍼상태보고(Buffer Status Report, BSR)가 트리거 되면, 상기 제 1 단말로부터 상기 버퍼상태보고를 수신하는 단계; 및상기 버퍼상태보고에 기초하여 상기 단말 간 직접 통신을 위한 무선 자원 할당 정보를 전송하는 단계를 포함하는 방법.
- 제 7항에 있어서,상기 버퍼상태보고는,상기 제 1 단말이 상기 단말 간 직접 통신을 개시하는 경우, 상기 단말 간 직접 통신을 시작한 경우, 상기 제 1 단말과 상기 단말 간 직접 통신을 수행하려는 제 2 단말로부터 상기 무선 자원 요청이 수신되는 경우, 더 높은 우선순위를 갖는 상기 단말 간 직접 통신을 위한 데이터가 버퍼에 들어온 경우, 상기 단말 간 직접 통신을 위한 데이터가 버퍼에 들어온 경우, 상기 버퍼에 상기 단말 간 직접 통신을 위한 데이터가 존재하고 재전송 타이머가 만료된 경우 및 상기 버퍼상태보고를 전송하기 위한 타이머가 만료된 경우 중 어느 하나의 경우가 발생한 경우에 트리거되는 방법.
- 제 7항에 있어서,상기 버퍼상태보고는,상기 기지국과의 통신을 위한 논리채널 식별자(Logical Channel Identity) 인덱스 값과 구분되는, 상기 단말 간 직접 통신을 위한 논리채널 식별자 인덱스 값을 포함하는 방법.
- 제 7항에 있어서,상기 버퍼상태보고는,적어도 하나 이상의 상기 단말 간 직접 통신을 구분하기 위한 단말 간 직접 통신 연결 식별자 인덱스 값을 포함하는 방법.
- 제 7항에 있어서,상기 버퍼상태보고는,상기 기지국과의 통신을 위한 논리 채널 및 상기 단말 간 직접 통신을 위한 논리채널에 대한 버퍼상태정보를 포함하되,상기 단말 간 직접 통신을 위한 논리채널은 상기 기지국과의 통신을 위한 논리 채널과 구분되는 논리채널그룹(Logical Channel Group)에 할당되는 방법.
- 제 7항에 있어서,상기 버퍼상태보고를 수신하는 단계 이전에,상기 단말 간 직접 통신을 위한 논리채널을 상기 기지국과의 통신을 위한 논리채널과는 구분되는 논리채널그룹에 할당하는 단계를 더 포함하는 방법.
- 제 1 단말이 제 2 단말과 단말 간 직접 통신을 수행하는 방법에 있어서,기지국 또는 무선자원 할당 개체로 상기 제 2 단말과의 단말 간 직접 통신을 위한 무선 자원 할당 요청 정보를 포함하는 제 1 신호를 전송하는 단계;상기 기지국 또는 상기 무선자원 할당 개체로부터 무선 자원 할당 정보를 포함하는 제 2 신호를 수신하는 단계;상기 무선 자원 할당 정보에 기초하여 상기 제 2 단말과 단말 간 직접 통신을 수행하는 단계; 및상기 제 2 단말과의 단말 간 직접 통신 상태에 대한 정보를 포함하는 제 3 신호를 전송하는 단계를 포함하는 방법.
- 제 13항에 있어서,상기 제 3 신호는,상기 단말 간 직접 통신 종료를 지시하는 지시 정보 및 상기 단말 간 직접 통신을 위한 버퍼 상태 정보 중 하나 이상의 정보를 포함하는 방법.
- 제 13항에 있어서,상기 제 2 신호는,상기 무선 자원의 유효 기간 정보를 더 포함하는 방법.
- 제 15항에 있어서,상기 제 3 신호는,상기 무선 자원의 유효 기간 만료 여부에 기초한 상기 무선 자원의 재할당을 요청하는 정보를 포함하는 방법.
- 제 13항에 있어서,상기 제 2 신호는,상기 단말 간 직접 통신을 위한 도움 정보를 더 포함하되,상기 도움 정보는 상기 단말 간 직접 통신을 위한 디스커버리 무선 자원 정보, 상기 단말 간 직접 통신을 위한 커뮤니케이션 무선 자원 정보, 상기 제 1 단말과 일정 거리에 위치하는 인접 단말 식별 정보, 상기 인접 단말 위치 정보, 상기 단말 간 직접 통신을 수행하는 그룹 식별 정보 및 상기 단말 간 직접 통신으로 전환할 데이터 무선 베어러 정보 중 하나 이상의 정보를 포함하는 방법.
- 제 13항에 있어서,상기 제 2 신호는,시스템 정보 블럭에 포함되어 전송되며,상기 무선 자원의 유효 기간 정보 및 상기 단말 간 직접 통신에 대한 우선 순위 정보 중 하나 이상의 정보를 더 포함하는 방법.
- 제 13항에 있어서,상기 무선자원 할당 개체는,상기 단말 간 직접 통신을 위한 무선 자원 할당, 싱크 채널 전송 및 상기 단말 간 직접 통신을 위한 그룹 관리 중 하나 이상의 역할을 수행하는 개체인 방법.
- 기지국이 단말 간 직접 통신을 제어하는 방법에 있어서,제 1 단말로부터 상기 단말 간 직접 통신을 위한 무선 자원 할당 요청 정보를 포함하는 제 1 신호를 수신하는 단계;무선 자원 할당 정보를 포함하는 제 2 신호를 전송하는 단계; 및상기 제 1 단말로부터 상기 단말 간 직접 통신 상태에 대한 정보를 포함하는 제 3 신호를 수신하는 단계를 포함하는 방법.
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CN201480045384.7A CN105474684B (zh) | 2013-08-09 | 2014-07-31 | 终端之间直接通信中缓冲状态报告传输方法及其装置 |
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KR1020140008556A KR101648251B1 (ko) | 2013-09-06 | 2014-01-23 | 단말 간 직접 통신에서 무선자원 할당 방법 및 그 장치 |
KR1020140017610A KR101655513B1 (ko) | 2013-08-09 | 2014-02-17 | 단말 간 직접 통신에서 버퍼상태보고 전송 방법 및 그 장치 |
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