WO2016122114A1 - Procédé et appareil pour gérer un rapport d'état de mémoire tampon tronqué dans un système de communication sans fil prenant en charge une communication de dispositif à dispositif - Google Patents

Procédé et appareil pour gérer un rapport d'état de mémoire tampon tronqué dans un système de communication sans fil prenant en charge une communication de dispositif à dispositif Download PDF

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Publication number
WO2016122114A1
WO2016122114A1 PCT/KR2015/013603 KR2015013603W WO2016122114A1 WO 2016122114 A1 WO2016122114 A1 WO 2016122114A1 KR 2015013603 W KR2015013603 W KR 2015013603W WO 2016122114 A1 WO2016122114 A1 WO 2016122114A1
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Prior art keywords
bsr
group
priority
terminal
truncated
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PCT/KR2015/013603
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English (en)
Korean (ko)
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권기범
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주식회사 아이티엘
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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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/121—Wireless traffic scheduling for groups of terminals or users
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient

Definitions

  • the present invention relates to wireless communication, in particular, in a wireless communication system supporting device to device communication (Device to Device communication) when the method used for controlling the resources used for communication between terminals by the network, the truncated buffer status report and a method and apparatus for operating a truncated buffer state report.
  • a wireless communication system supporting device to device communication (Device to Device communication) when the method used for controlling the resources used for communication between terminals by the network, the truncated buffer status report and a method and apparatus for operating a truncated buffer state report.
  • D2D communication is a communication method that has been possible since the days of analog radio, and has a long history.
  • D2D communication in a wireless communication system is different from the conventional D2D communication.
  • D2D communication is a communication in which geographically adjacent terminals directly transmit and receive data using a transmission / reception technology of the wireless communication system in a frequency band or other band of the wireless communication system without going through an infrastructure such as a base station. Means. This enables the terminal to use the wireless communication outside the area where the wireless communication infrastructure is established, and provides the advantage of reducing the network load of the wireless communication system.
  • a base station For inter-terminal communication in such a wireless communication system, a base station provides resources required for terminals existing in in-coverage to transmit data through a sidelink defined as an inter-terminal interface for D2D communication. It can be scheduled. To this end, the terminal may inform the base station via a buffer state report (BSR) how much data exists in the buffer in the terminal to be transmitted in the sidelink. In this case, when the uplink resource allocated from the base station is not enough to send the buffer status information generated based on the amount of data that can be transmitted for all targets that the terminal intends to perform D2D communication through the sidelink to the base station.
  • BSR buffer state report
  • At least one or more of the targets for D2D communication through the sidelink transmits a truncated form of BSR including information on only some of the targets but not all the targets.
  • the priority of BSR for D2D communication is set to be lower than BSR and PHR (Power Headroom Report) for radio communication between the terminal and the base station. Accordingly, the amount of uplink resources required for the BSR transmission for the D2D communication by the base station may be lower than the amount of uplink resources required for the BSR transmission for the D2D communication determined by the information and priority generated by the terminal.
  • the present invention provides a method and apparatus for operating a truncated buffer status report in a wireless communication system supporting communication between terminals.
  • a method of operating a buffer state report (BSR) by a terminal in a wireless communication system supporting device to device (D2D) communication receives uplink resource allocation information from a base station.
  • a method for operating a buffer status report by a base station in a wireless communication system supporting inter-terminal communication includes transmitting uplink resource allocation information to a terminal, for each group of targets to transmit D2D data from the terminal.
  • the method may include allocating resources for D2D communication to the terminal.
  • a terminal or a base station for allocating resources for inter-terminal communication in a wireless communication system can efficiently receive information on the buffer status.
  • FIG. 1 is a diagram illustrating a wireless communication system to which the present invention is applied.
  • FIG. 2 is a diagram illustrating an example of a MAC subheader in a wireless communication system.
  • FIG. 3 illustrates a MAC control element of a buffer status report in a wireless communication system.
  • FIG. 4 is a diagram illustrating a concept of cellular network-based D2D communication applied to the present invention.
  • FIG. 5 is a diagram illustrating a format of ProSe-BSR according to an embodiment of the present invention.
  • FIG. 6 is a view showing a truncated ProSe-BSR transmission method according to an embodiment of the present invention.
  • FIG. 7 is a diagram illustrating a truncated ProSe-BSR transmission method according to another embodiment of the present invention.
  • FIG. 8 is a view showing a ProSe-BSR operation method cut by the terminal according to an embodiment of the present invention.
  • FIG. 9 is a view showing a ProSe-BSR operation method cut by the base station according to an embodiment of the present invention.
  • FIG. 10 is a block diagram illustrating a wireless communication system according to an embodiment of the present invention.
  • the present specification describes a wireless communication network
  • the operation performed in the wireless communication network is performed in the process of controlling the network and transmitting data in the system (for example, the base station) that is in charge of the wireless communication network, or the corresponding wireless Work may be performed in a terminal included in the network.
  • FIG. 1 is a diagram illustrating a wireless communication system to which the present invention is applied.
  • the network structure shown in FIG. 1 may be a network structure of an Evolved-Universal Mobile Telecommunications System (E-UMTS).
  • E-UMTS Evolved-Universal Mobile Telecommunications System
  • the E-UMTS system may include a Long Term Evolution (LTE), an LTE-A (Advanced) system, and the like.
  • LTE Long Term Evolution
  • LTE-A Advanced
  • a base station (BS) 11 and a user equipment (UE) 12 may wirelessly transmit and receive data.
  • the wireless communication system 10 may support device-to-device (D2D) communication.
  • D2D device-to-device
  • the base station 11 may provide a communication service to a terminal existing within the transmission coverage of the base station through a specific frequency band. Coverage serviced by a base station can also be expressed in terms of site.
  • the site may include a number of regions 15a, 15b, 15c, which may be called sectors. Each sector included in the site may be identified based on different identifiers. Each sector 15a, 15b, 15c may be interpreted as a partial area covered by the base station 11.
  • the base station 11 generally refers to a station that communicates with the terminal 12, and includes an evolved-NodeB (eNodeB), a base transceiver system (BTS), an access point, an femto eNodeB, and a household It may be called by other terms such as a base station (HeNodeB: Home eNodeB), a relay, a remote radio head (RRH), and the like.
  • eNodeB evolved-NodeB
  • BTS base transceiver system
  • femto eNodeB access point
  • femto eNodeB femto eNodeB
  • RRH remote radio head
  • the terminal 12 may be fixed or mobile, and may include a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, and a personal digital assistant (PDA). , Wireless modem, handheld device, or other terms.
  • MS mobile station
  • MT mobile terminal
  • UT user terminal
  • SS subscriber station
  • PDA personal digital assistant
  • the base station 11 may be called in various terms such as megacell, macrocell, microcell, picocell, femtocell, etc. according to the size of coverage provided by the base station.
  • a cell may be used as a term indicating a frequency band provided by a base station, coverage of a base station, or a base station.
  • downlink means a communication or communication path from the base station 11 to the terminal 12
  • uplink means a communication or communication path from the terminal 12 to the base station 11.
  • the transmitter may be part of the base station 11 and the receiver may be part of the terminal 12.
  • the transmitter may be part of the terminal 12 and the receiver may be part of the base station 11.
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier-FDMA
  • OFDM-FDMA OFDM-FDMA
  • the uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme transmitted using different times or a frequency division duplex (FDD) scheme transmitted using different frequencies.
  • TDD time division duplex
  • FDD frequency division duplex
  • FIG. 2 is a diagram illustrating an example of a MAC subheader in a wireless communication system
  • FIG. 3 is a diagram illustrating a MAC control element of a buffer status report.
  • BSR buffer state report
  • Layers of the radio interface protocol between the terminal and the network are the first layer (L1) and the second layer defined in the 3GPP (3rd Generation Partnership Project) series of wireless communication systems (UMTS, LTE, LTE-Advanced, etc.). It may be divided into L2 and a third layer L3.
  • the physical layer belonging to the first layer (L1) provides an information transfer service (MAC) layer to a media access control (MAC) layer, which is a higher layer, using a physical channel.
  • a Radio Resource Control (RRC) layer located in the RRC exchanges RRC messages to control radio resources between the UE and the network.
  • the MAC layer is multiplexed or demultiplexed into a transport block provided as a physical channel on a transport channel of a logical service channel (LC) and a transport channel and a MAC service data unit (SDU) belonging to the logical channel. Can be performed.
  • LC logical service channel
  • SDU MAC service data unit
  • the base station controls the BSR procedure for the logical channel in each terminal through the signaling defined in the RRC layer.
  • a logical channel group (LCG) may be configured as selective signaling, and the BSR may be performed on the LCG.
  • the terminal may configure a BSR based on data buffered in each LCG in the terminal. Up to four LCGs may be configured in the terminal.
  • the formats of the BSR include a short BSR for reporting a buffer state corresponding to one LCG, a long BSR for reporting a buffer state corresponding to four LCGs, and a truncated BSR.
  • the BSR may be classified into a regular BSR, a padding BSR, and a periodic BSR.
  • General BSR triggers when there is uplink data transmittable on a logical channel included in the LCG or when uplink data transmittable is present on a logical channel having a higher priority than other logical channels in which data is already transmitted. is triggered.
  • the padding BSR is triggered when uplink resources are allocated and the number of padding bits is equal to or greater than the size for BSR transmission.
  • the periodic BSR is triggered when the periodic BSR timer expires.
  • Normal and periodic BSRs are sent in long BSR format if more than one LCG (at least two LCGs) have data to transmit in the Transmission Time Interval (TTI) over which they are sent, otherwise (one Is transmitted in the short BSR format.
  • the padding BSR is equal to or greater than the sum of the number of padding bits included in the MAC Protocol Data Unit (MAP PDU) and the subheaders of the short BSR and the short BSR, but smaller than the sum of the subheaders of the long and long BSRs. If more than one LCG has data to be transmitted in the TTI to which the BSR is transmitted, it is transmitted in a truncated BSR format for the LCG containing the logical channel with the highest priority for data transmission.
  • MAP PDU MAC Protocol Data Unit
  • the short BSR format is transmitted.
  • the padding BSR is transmitted in a long BSR format when the number of padding bits is equal to or larger than the sum of the long header and the subheader of the long BSR.
  • the BSR is included in the MAC PDU and transmitted to the base station, and one MAC PDU includes only one MAC control element even though a plurality of BSRs are triggered.
  • the MAC PDU may include a MAC header, a MAC control element, a MAC Service Data Unit (SDU), and padding.
  • the MAC header includes at least one subheader, each subheader corresponding to a MAC control element, MAC SDU or padding, respectively.
  • the MAC subheader includes six fields (R, R, E, LCID, F, L) as shown in Figs. 2 (a) and 2 (b), or as shown in Fig. 2 (c). It includes four fields (R, R, E, LCID).
  • the Logical Channel ID (LCID) field is a field that identifies a logical channel of a corresponding MAC SDU or a type of a corresponding MAC control element or padding.
  • the Length field is a length field. This field identifies the length of a MAC SDU or the length of a variable-sized MAC control element.
  • the F field is a field for identifying the length of the L field
  • the Extension field is a field for identifying whether there are other fields in the MAC header
  • the R (Reserved) field is a reserved field and is set to "0". do.
  • the MAC control elements of the short BSR and truncated BSR consist of one LCG ID field and one buffer size (BS) field corresponding thereto.
  • the MAC control element of the long BSR is composed of four buffer size fields corresponding to four LCG IDs (# 0 LCG ID to # 3 LCD ID).
  • the format of the BSR is identified by the value of the logical channel identifier (LCID) included in the subheader of the MAC PDU. For example, LCID values for uplink are shown in Table 1 below.
  • the LCG ID field is for identifying a group of logical channels whose buffer status is reported to the base station, and the buffer size field is used for all logical channels in the LCG after all MAC PDUs to be transmitted during one TTI are established. To identify the total amount of available data.
  • FIG. 4 is a diagram illustrating a concept of cellular network-based D2D communication applied to the present invention.
  • D2D communication may refer to a technique for directly transmitting and receiving data between terminals.
  • the terminal supports D2D communication.
  • the D2D may be replaced with a proximity based service (ProSe) or ProSe-D2D.
  • ProSe proximity based service
  • ProSe-D2D ProSe-D2D
  • the use of the term ProSe for D2D means that the meaning of transmitting and receiving data directly between terminals is not changed, but the meaning of proximity-based service may be added.
  • the air interface between the terminals in which the D2D communication is performed is defined as a side link.
  • a terminal that transmits a signal based on inter-terminal communication may be referred to as a transmitting terminal (Tx UE), and a terminal that receives a signal based on inter-terminal communication may be defined as a receiving terminal (Rx UE).
  • the transmitting terminal may transmit a discovery signal, and the receiving terminal may receive the discovery signal.
  • the roles of the transmitting terminal and the receiving terminal may be changed.
  • the signal transmitted by the transmitting terminal may be received by two or more receiving terminals.
  • the load of the base station may be distributed.
  • the terminals since the terminals transmit data at a relatively short distance, consumption of transmission power and transmission latency of the terminal may be reduced.
  • the existing cellular-based communication and D2D communication use the same resources, thereby improving frequency utilization efficiency.
  • D2D communication may be classified into a communication method of a terminal located in network coverage (base station coverage) and a communication method of a terminal located out of network coverage (out-of-coverage).
  • base station coverage base station coverage
  • a communication method of a terminal located out of network coverage out-of-coverage.
  • FIG. 4 communication between a first terminal 410 located in a first cell and a second terminal 420 located in a second cell, a third terminal 430 located in a first cell, and a fourth terminal located in a first cluster.
  • the communication between 440 may be D2D communication within network coverage.
  • the communication between the fourth terminal 440 located in the first cluster and the fifth terminal 450 located in the first cluster may be D2D communication outside network coverage.
  • the fifth terminal 450 may operate as a cluster head (CH) of the first cluster.
  • the cluster head refers to a terminal in charge of allocating resources.
  • the cluster header may include an independent synchronization source (ISS) for synchronization of a terminal located outside
  • D2D communication may be classified into a discovery procedure for performing discovery for communication between terminals and a direct communication procedure for transmitting and receiving control data and / or traffic data between terminals.
  • D2D communication can be used for various purposes. For example, D2D communication in network coverage based on commercial frequency may be used for public safety, ultra-low latency service, commercial purpose service, and the like. If the terminal can determine that it is out of network coverage based on the commercial frequency, for example, the signal strength received from all base stations is a predetermined time or less than a predetermined threshold stored in the terminal predefined in the wireless communication system If maintained for a while, D2D communication may be used for public safety only. However, when based on public safety frequencies, D2D communication can be used for public safety only, regardless of network coverage.
  • the base station 400 may transmit the D2D resource allocation information to the first terminal 410.
  • the first terminal 410 is a terminal located within the coverage of the base station 400.
  • the D2D resource allocation information may include allocation information on a transmission resource and / or a reception resource that can be used for D2D communication between the first terminal 410 and another terminal, that is, the second terminal 420.
  • the first terminal 410 may transmit the D2D resource allocation information to the second terminal 420.
  • the second terminal 420 may be a terminal located outside the coverage of the base station 400.
  • the first terminal 410 and the second terminal 420 may perform D2D communication based on the D2D resource allocation information.
  • the second terminal 420 may obtain information about the D2D communication resource of the first terminal 410.
  • the second terminal 420 may receive data transmitted from the first terminal 410 through a resource indicated by the information on the D2D communication resource of the first terminal 410.
  • a terminal supporting D2D communication connects to a D2D management server and successfully completes the D2D operation authentication procedure and receives D2D communication when an identifier (ID) (s) to be used for D2D operation is allocated.
  • ID an identifier
  • the identifiers may include a source ID of a terminal, a destination ID for a group including the terminal, and a destination ID for another group in which the terminal may perform D2D communication.
  • the D2D terminal may perform D2D communication when the user of the terminal is configured to enable D2D communication of the terminal through a user interface (UI).
  • UI user interface
  • D2D communication may be performed only when a message including information for allowing D2D operation is transmitted.
  • the information allowing the D2D operation may be defined as whether a system information block (SIB) including configuration information for each of communication and discovery is transmitted from the base station during the D2D operation.
  • SIB system information block
  • Resources for D2D communication may be allocated by a terminal (hereinafter, referred to as a cluster head) or a base station in charge of allocating resources for D2D communication during D2D communication.
  • the terminal should transmit the BSR for the D2D data to the base station or the cluster head when performing the D2D communication.
  • the base station and the cluster head are collectively referred to as a base station.
  • the BSR for the D2D data is called ProSe-BSR.
  • the cellular network may be replaced by the term wide area network (WAN).
  • WAN wide area network
  • the UE may operate in a first transmission mode and a second transmission mode.
  • the first transmission mode is a mode in which the D2D communication can be performed only when the terminal is allocated a resource for the D2D communication from the base station, and the base station transmits the D2D grant to the transmitting terminal.
  • the D2D grant includes parameter information to be determined by the base station among SA (Scheduling Assignment) information, which is control information to be secured for receiving D2D data in a receiving terminal, during D2D communication, by resource allocation information for the SA, and by the SA. Resource allocation information for the indicated data is instructed to the transmitting terminal.
  • Parameter information to be determined by the base station includes resource allocation information for the data indicated by the SA.
  • the D2D grant may be transmitted to a transmitting terminal through downlink control information (DCI), and the DCI may be transmitted through a physical downlink control channel (PDCCH) or an extended PDCCH (EPDCCH).
  • DCI downlink control information
  • PDCH physical downlink control channel
  • EPDCCH extended PDCCH
  • the D2D grant may be referred to as a sidelink grant (SL grant).
  • the second transmission mode is a mode in which the UE may perform D2D communication irrespective of the indication of the base station, and the UE may use radio resources (eg, time, frequency, space, etc.) available in the second transmission mode during D2D communication. ), Internally select a resource to be used to transmit the D2D data.
  • the UE has information indicating that a specific cell in the base station can support D2D through system information block (SIB) / dedicated signaling, and D2D resource pool information for a second transmission mode provided from the base station. Only when present, the specific cell may operate in the second transmission mode.
  • SIB system information block
  • the base station does not allow operation in the second transmission mode, that is, there is information indicating that a specific cell in the base station can support D2D, but the D2D resource pool information for the second transmission mode is provided from the base station. If not, the terminal cannot operate in the second transmission mode.
  • the D2D resource pool information for the second transmission mode stored in the Universal Subscriber Identity Module (USIM) Integrated Circuit Card (UICC) of the terminal or the like is used.
  • the service area may operate in the second transmission mode by using the D2D resource pool information for the second transmission mode received through the base station.
  • the D2D user equipment may inform the base station via ProSe-BSR of how much data exists in the buffer to be transmitted in D2D communication.
  • FIG. 5 is a diagram illustrating a format of ProSe-BSR according to an embodiment of the present invention.
  • the BSR truncated in the WAN only contains information about one LCG with the highest priority. This is information that the base station needs the most information about the LCG that is set as the highest priority by the base station in terms of quality of service (QoS), and recognizes to the base station that there is uplink data for other LCGs besides the LCG. To do so. Since the truncated BSR could be generated only in the padding BSR, the base station can know the amount of uplink resources including the BSR for all LCGs through the general or periodic BSR included in the uplink transmission data transmitted to the corresponding TTI. Because it was.
  • QoS quality of service
  • the transmission priority of a general / periodic BSR has the highest priority except for data including a C-RNTI and information about a common control channel (CCCH).
  • the ProSe-BSR may include information on a destination capable of transmitting ProSe data through the sidelink, separately from the information on the LCG.
  • the object may be composed of one or more terminals. Therefore, it is defined as a group destination.
  • the group object is referred to as a 'group' for the sake of simplicity.
  • FIG. 5 illustrates a MAC control element of ProSe-BSR.
  • the ProSe-BSR MAC control element is configured as shown in FIG. 5 (a) when the number (N) of groups included in the ProSe-BSR is even, and as shown in FIG. If the number of groups included in the ProSe-BSR is an odd number, four reserved bits may be included.
  • the group index is a value for identifying a group (ProSe destination group) to which ProSe data is to be transmitted and has a length of 4 bits. This value is set to the index of the destination ID reported by the terminal in RRC signaling.
  • ProSeDestinationInfoList ProSe Destination Information List
  • the base station has a group index of 0 in the order listed (for example, in descending order).
  • the LCG ID is for identifying the group of logical channels whose buffer status is reported to the base station, and the buffer size field is the total of available data on all logical channels in the LCG after all MAC PDUs to be transmitted during one TTI have been established. To identify the quantity.
  • ProSe-BSR has a priority included in the uplink resource is set after the BSR for the WAN. Therefore, when transmitting ProSe-BSR, if there are many groups (IDs for up to 16 groups can be configured), and if uplink resource allocation for the WAN is not sufficient to send ProSe-BSR, it will be truncated. There may be a situation in which ProSe-BSR continues to be transmitted. This is because the priority of ProSe-BSR to be included in the uplink resource is after information indicating Cell Radio-Network Temporary Identifier (C-RNTI), Common control channel (CCCH) information, BSR for WAN, and PHR information for WAN. This is because, when such information occurs, uplink resources are allocated to them first. In addition, there may be a case where the maximum amount of resources that can be allocated by the scheduler is limited according to an uplink load situation of the serving cell.
  • C-RNTI Cell Radio-Network Temporary Identifier
  • CCCH Common control channel
  • the present specification provides a truncated ProSe-BSR transmission method considering the fairness and priority of each ProSe group as in the following embodiments.
  • FIG. 6 is a view showing a truncated ProSe-BSR transmission method according to an embodiment of the present invention.
  • the priority of the buffer status information for the group that the terminal is to include in the ProSe-BSR may be the same for all groups. In other words, all groups may be included in the ProSe-BSR with the same priority. Whether or not the UE includes buffer status information for the first disconnected ProSe-BSR depends on other criteria such as priority set based on QoS parameters of data included in each group or D2D transmission priority for each group set by the UE. Can be determined.
  • the terminal selects a group to be included in the next truncated ProSe-BSR. At least one group which was not included in the truncated ProSe-BSR transmitted immediately before may be included first. If all groups that were not included in the truncated ProSe-BSR transmitted immediately before are included, but the remaining uplink resources may include buffer status information for the additional group, the truncated ProSe-BSR previously transmitted may be included. It may further include buffer status information for the group that was included.
  • FIG. 6 a case where N groups are configured in a terminal is illustrated.
  • the first truncated ProSe-BSR (Truncated ProSe-BSR # 1)
  • the second truncated ProSe-BSR # 2 is transmitted, a group corresponding to buffer status information of m + 1 to N is larger than a group corresponding to m buffer status information previously transmitted. May have a high priority.
  • the second truncated ProSe-BSR may include buffer status information for k groups
  • the second truncated ProSe-BSR includes buffer status information for groups corresponding to a range of m + 1 to m + k. May be included.
  • the m, k, and N values are irrelevant to the group index and refer to the number of groups arbitrarily set for explanation.
  • the terminal may check whether the truncated ProSe-BSR is transmitted immediately before configuring the truncated ProSe-BSR.
  • a group not included in the immediately truncated ProSe-BSR may be increased in order to be included in the truncated ProSe-BSR to be transmitted this time.
  • FIG. 7 is a diagram illustrating a truncated ProSe-BSR transmission method according to another embodiment of the present invention.
  • the priority for inclusion in the ProSe-BSR may be determined according to the priority of each group determined by the terminal or set by the destination ID value for sidelink resource allocation.
  • the priority for each group for the sidelink resource allocation may be set directly by the terminal or may be set based on the priority for each LCG. For example, when a priority for inclusion in the ProSe-BSR is set based on the priority of each LCG, group # 1 corresponding to the LCG including the LC having the highest priority and the third priority has the second priority. Branches may be included in the ProSe-BSR with a higher priority than group # 2 for the LCG containing the LC.
  • the priority of each group determined by the destination ID value may be set to have a higher priority as the destination ID value is smaller, and the D2D related application in the terminal communicating with the D2D authentication server may select the D2D authentication server.
  • the priority of each group for sidelink resource allocation may be determined based on the priority for each destination ID set by the application program based on the priority set based on the received information.
  • the group to be included in the truncated ProSe-BSR to be transmitted next generates a current ProSe-BSR.
  • the group having the highest priority to be included in the ProSe-BSR at the time point is included in the truncated ProSe-BSR to be transmitted next, regardless of whether it is included in the truncated ProSe-BSR transmitted immediately before, and then immediately before the transmission. Groups that were not included in the truncated ProSe-BSR may be included in the truncated ProSe-BSR to be transmitted next.
  • FIG. 7 illustrates a case in which information about buffer states of m groups is transmitted through a first truncated ProSe-BSR # 1 (Truncated ProSe-BSR # 1).
  • the index of the group having the highest priority is A at the time point T 1 at which the first truncated ProSe-BSR # 1 (Truncated ProSe-BSR # 1) is generated and the first truncated ProSe-BSR.
  • the buffer state information of the group index A may be preferentially transmitted.
  • the second cut ProSe-BSR (Truncated ProSe-BSR # 2) when the generated situation that was sent with the highest priority in If the group index is B, the buffer status information for the group index B is p, and the second truncated ProSe-BSR may include k buffer status information, the second truncated ProSe-BSR is currently ProSe-.
  • P buffer state information for the group index B having the highest priority at the time T 2 when the BSR is generated is preferentially included, and then kp buffers for the groups not included in the first truncated ProSe-BSR. Status information may be included in the second truncated ProSe-BSR.
  • the terminal checks whether the truncated ProSe-BSR was immediately transmitted when configuring the truncated ProSe-BSR, and if the truncated ProSe-BSR truncated immediately before is transmitted, the terminal is assigned to the group having the highest priority at the present time.
  • the buffer status information may be included in the truncated ProSe-BSR to be transmitted next, while the priority of the group not included in the immediately truncated ProSe-BSR other than the highest priority group may be increased.
  • the priority for inclusion in the ProSe-BSR may be determined according to the ProSe-BSR priority allocation value based on the priority of each group for ProSe resource allocation.
  • the priority of each group for ProSe resource allocation may be set as a quantitative parameter.
  • the ProSe-BSR priority allocation value adjusted by the quantitative parameter does not affect the group priority for the ProSe resource allocation.
  • the priority for each group for ProSe resource allocation may be directly set by the UE or may be set based on the priority for each LCG.
  • the quantitative parameter may be in the range of 1 to x, for example. Where x is a positive integer. For example, x may be 4, 8, 16.
  • the ProSe-BSR priority allocation value may be adjusted to a value of -y when the truncated ProSe-BSR is included. Wherein the y value is a natural number and is always less than x.
  • the terminal checks whether the truncated ProSe-BSR was immediately transmitted when configuring the truncated ProSe-BSR, and if the truncated ProSe-BSR was truncated immediately before, the truncated ProSe-BSR was transmitted immediately before.
  • the priority of the group included in the BSR may be lowered by the ProSe-BSR priority allocation value. That is, the priority of the group included in the truncated ProSe-BSR transmitted immediately before may be adjusted downward.
  • the priority for inclusion in the general / periodic ProSe-BSR is based on the timing at which the transmittable data for each group is generated or in a random manner or for the above-mentioned ProSe resource allocation. Although this may be determined according to the priority set by the user or destination ID based group, the priority for inclusion in the truncated ProSe-BSR should be set based on the group priority for ProSe resource allocation. Because, when transmitting the truncated ProSe-BSR that does not include the buffer status information for all groups, the quality of service and emergency of the D2D communication by transmitting the buffer status information for the group that the terminal wants to first transmit to the base station to the base station Because it can meet. Therefore, since the base station does not have information on the priority of each group of the terminal, the base station may recognize the priority of each group set by the terminal according to the order of the group information included in the truncated ProSe-BSR.
  • FIG. 8 is a view showing a ProSe-BSR operation method cut by the terminal according to an embodiment of the present invention.
  • the D2D user equipment may transmit a list of identifiers of targets to which the D2D data is to be transmitted to the base station by using the RRC message when operating in the first transmission mode. Subsequently, as shown in FIG. 8, when the D2D user equipment receives uplink resource allocation information from the base station through the D2D grant (S810), all targets to which the uplink resource allocated through the uplink resource allocation information transmits the D2D data are received.
  • the buffer status information for the D2D data If it is difficult to report the buffer status information for the D2D data to configure the truncated ProSe-BSR including the buffer status information for at least one group according to the priority of each group of the target to be transmitted (S820), and transmits the D2D data The priority of each target group is readjusted (S830). Then, the configured ProSe-BSR is transmitted to the base station.
  • the step of re-adjusting the priority of each group of targets to which the D2D data is to be transmitted is performed after the truncated ProSe-BSR is configured, but if the truncated ProSe-BSR is triggered as necessary, truncation is performed. It may be performed when it is confirmed that a situation in which the generated ProSe-BSR occurs continuously occurs.
  • the D2D UE may check whether the format of the BSR transmitted immediately before the configuration of the truncated ProSe-BSR is a truncated ProSe-BSR. If the format of the ProSe-BSR transmitted immediately before the configuration of the truncated BSR is a truncated ProSe-BSR, the D2D UE may adjust the priority of each group of the target to which the D2D data is to be transmitted.
  • the D2D user equipment adjusts the priority of a group not included in the truncated ProSe-BSR transmitted immediately before, so that a group not included in the truncated ProSe-BSR transmitted immediately before is preferentially transmitted at this time. It can be included in ProSe-BSR. Alternatively, the priority of the group included in the truncated ProSe-BSR transmitted immediately before is lowered so that a group not included in the truncated ProSe-BSR transmitted immediately before is preferentially assigned to the truncated ProSe-BSR to be transmitted this time. Can be included.
  • the group having the highest priority among the groups of the target of the D2D data transmission may be included in the truncated BSR.
  • the priority for each group to be included in the truncated BSR may be determined according to the priority of each group for ProSe resource allocation.
  • the priority for each group for ProSe resource allocation may be set directly by the D2D UE or based on the priority for each LCG set by the base station. Or, it may be set based on the priority of each group determined by the destination ID value.
  • the priority of each group for ProSe resource allocation may be set as a quantitative parameter.
  • the priority of each group to be included in the truncated ProSe-BSR is determined whether or not it is included in the transmitted ProSe-BSR transmitted immediately before. May not be affected.
  • the base station may recognize the priority between groups set by the terminal according to the order of the groups included in the truncated ProSe-BSR transmitted by the D2D terminal.
  • FIG. 9 is a view showing a ProSe-BSR operation method cut by the base station according to an embodiment of the present invention.
  • the operation of the base station in the case where the priority for including the group of the target to transmit the D2D data is included in the truncated ProSe-BSR is determined by the terminal.
  • the priority for the group to be included in the truncated ProSe-BSR may not be affected depending on whether it is included in the truncated ProSe-BSR. That is, the priority for being included in the truncated ProSe-BSR may not be adjusted based on whether it is included in the truncated ProSe-BSR.
  • a base station may receive a list of an identifier of a target of transmitting D2D data from a D2D terminal through an RRC message (S910). Thereafter, the base station may transmit uplink resource allocation information to the D2D terminal through a D2D grant (S920), and according to the priority for each group of the target to transmit D2D data based on the uplink resource allocation information from the D2D terminal.
  • the configured cut BSR may be received (S930).
  • the base station may recognize the priority for each group of the target to transmit the D2D data set in the D2D terminal based on the truncated BSR (S940), and thus may allocate resources for D2D communication to the D2D terminal (S950). ).
  • FIG. 10 is a block diagram illustrating a wireless communication system according to an embodiment of the present invention.
  • a wireless communication system supporting inter-terminal communication includes a terminal 1000 and a base station (or cluster head) 1100.
  • the terminal 1000 includes a processor 1010, an RF unit 1020, and a memory 1030.
  • the memory 1030 is connected to the processor 1010 and stores various information for driving the processor 1010.
  • the RF unit 1020 is connected to the processor 1010 and transmits and / or receives a radio signal.
  • the RF unit 1020 may receive the D2D resource allocation information posted herein from the base station 1100.
  • the RF unit 1020 may transmit an uplink signal such as a truncated ProSe-BSR disclosed herein to the base station 1100.
  • the processor 1010 implements the functions, processes, and / or methods proposed herein.
  • the processor 1005 allows all steps according to FIGS. 6 to 8 to be performed.
  • the processor 1010 may include a determiner 1011 and a component 1012.
  • the determination unit 1011 may determine whether the cut ProSe-BSR is continuously configured or transmitted. To this end, when the truncated BSR is configured, the determination unit 1011 may check whether the format of the immediately transmitted ProSe-BSR is the truncated ProSe-BSR.
  • the configuration unit 1012 configures the truncated ProSe-BSR including buffer status information for at least one group according to the priority of each group of the target of the D2D data transmission.
  • the priority of the group not included in the truncated ProSe-BSR transmitted immediately before is determined. May be adjusted upward so that a group not included in the truncated ProSe-BSR transmitted immediately before is included in the truncated ProSe-BSR to be transmitted this time.
  • the priority of the group included in the truncated ProSe-BSR transmitted immediately before is lowered so that a group not included in the truncated ProSe-BSR transmitted immediately before is preferentially assigned to the truncated ProSe-BSR to be transmitted this time. Can be included.
  • the configuration unit 1012 may allow the group having the highest priority among the groups of targets to which the D2D data is transmitted to be included in the truncated ProSe-BSR. .
  • the priority for each group to be included in the truncated ProSe-BSR may be determined according to the priority for each group for ProSe resource allocation.
  • the priority for each group for ProSe resource allocation may be directly set by the D2D UE, based on the priority for each LCG set by the base station, or may be set based on a destination ID.
  • the priority of each group for ProSe resource allocation may be adjusted by quantitative parameters.
  • the determination unit 1011 may include a transmission time determination unit and a priority determination unit. If it is determined that the information on the buffer status of the m groups is transmitted through the first truncated ProSe-BSR at the first time point, the transmission time determining unit is the next time point immediately after the first truncated ProSe-BSR is transmitted. At two time points, it may be determined whether the second truncated ProSe-BSR is transmitted. When the second truncated ProSe-BSR is transmitted at the second time point, the priority determiner corresponds to m pieces of buffer state information that were transmitted at the first time point. It may be determined to have a higher priority than the group.
  • the configuration unit 1012 may determine that the second truncated ProSe-BSR corresponds to a range of m + 1 to m + k. It can be configured to include buffer status information for. In addition, the configuration unit 1012 may be configured to include the buffer status information for the group having the highest priority at the time when the second truncated ProSe-BSR is configured.
  • the memory 1030 may store uplink resource information, information about the truncated ProSe-BSR, and the like according to the present specification, and may provide the same to the processor 1010 according to a request of the processor 1010.
  • the base station 1100 includes a radio frequency (RF) unit 1110, a processor 1120, and a memory 1130.
  • the memory 1130 is connected to the processor 1120 and stores various information for driving the processor 1120.
  • the RF unit 1130 is connected to the processor 1120 to transmit and / or receive a radio signal.
  • the processor 1120 implements the functions, processes, and / or methods proposed herein. In the above-described embodiment, the operation of the base station 1100 may be implemented by the processor 1120.
  • the processor 1120 generates a D2D grant published in this specification and schedules a resource for D2D communication based on the truncated ProSe-BSR received from the terminal 1000.
  • the processor 1120 may include an allocation unit 1121 and a confirmation unit 1122.
  • the allocator 1121 may allocate an uplink resource to the terminal 1000.
  • the identification unit 1122 may check the priority for each group of the target to transmit the D2D data set in the terminal 1000.
  • the identification unit 1122 confirms a reception time of the truncated ProSe-BSR to correspond to the order of group information included in the truncated ProSe-BSR. It can be recognized that the priority of each group set by the UE for each group at the time point (the order of the groups to which the UE preferentially transmits the D2D data at that time point). In this case, the allocator 1121 may allocate an uplink resource necessary for the corresponding time point to the terminal 1000 according to the priority of each group set by the terminal at that time.
  • the processor may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
  • the memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage device.
  • the RF unit may include a baseband circuit for processing a radio signal.
  • the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
  • the module may be stored in memory and executed by a processor.
  • the memory may be internal or external to the processor and may be coupled to the processor by various well known means.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un appareil pour gérer un rapport d'état de mémoire tampon (BSR) tronqué dans un système de communication sans fil prenant en charge une communication de dispositif à dispositif (D2D). Le procédé pour gérer un BSR par un terminal dans un système de communication sans fil prenant en charge une communication D2D peut comprendre les étapes consistant à : recevoir, à partir d'une station de base, des informations d'affectation de ressource de liaison montante ; selon l'ordre de priorité par groupe de sujets auxquels des données D2D doivent être transmises, configurer un BSR tronqué comprenant des informations d'état de mémoire tampon sur au moins l'un des groupes ; et transmettre, à la station de base, le BSR tronqué.
PCT/KR2015/013603 2015-01-29 2015-12-11 Procédé et appareil pour gérer un rapport d'état de mémoire tampon tronqué dans un système de communication sans fil prenant en charge une communication de dispositif à dispositif WO2016122114A1 (fr)

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KR1020150014333A KR102248331B1 (ko) 2015-01-29 2015-01-29 단말간 통신을 지원하는 무선 통신 시스템에서 절단된 버퍼상태보고 운용 방법 및 장치

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KR102402873B1 (ko) * 2017-03-16 2022-05-30 베이징 시아오미 모바일 소프트웨어 컴퍼니 리미티드 절삭된 버퍼 상태 보고

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