WO2017187713A1 - Appareil et procédé destinés à la communication sans fil - Google Patents

Appareil et procédé destinés à la communication sans fil Download PDF

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Publication number
WO2017187713A1
WO2017187713A1 PCT/JP2017/004819 JP2017004819W WO2017187713A1 WO 2017187713 A1 WO2017187713 A1 WO 2017187713A1 JP 2017004819 W JP2017004819 W JP 2017004819W WO 2017187713 A1 WO2017187713 A1 WO 2017187713A1
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Prior art keywords
transmission
communication
neighboring
transmission rate
communication pairs
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PCT/JP2017/004819
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English (en)
Japanese (ja)
Inventor
一志 村岡
ケビン リン
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日本電気株式会社
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Priority to JP2018514130A priority Critical patent/JP6835074B2/ja
Publication of WO2017187713A1 publication Critical patent/WO2017187713A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • This disclosure relates to direct communication between devices (device-to-device (D2D) communication).
  • D2D device-to-device
  • D2D communication A form in which a wireless terminal communicates directly with another wireless terminal without going through an infrastructure network such as a base station is called device-to-device (D2D) communication.
  • the D2D communication includes at least one of direct communication (Direct Communication) and direct discovery (Direct Discovery).
  • a plurality of wireless terminals that support D2D communication form a D2D communication group autonomously or according to a network instruction, and communicate with other wireless terminals in the D2D communication group.
  • Proximity-based services defined in 3GPP Release 12 and Release 13 is an example of D2D communication (see Non-Patent Document 1, for example).
  • ProSe Direct Discovery is a wireless terminal that can execute ProSe (ProSe-enabled User Equipment (UE)) and other ProSe-enabled UEs. -UTRA) It is performed by the discovery procedure using only the technology (technology).
  • ProSe direct discovery may be performed by three or more ProSe-enabled UEs.
  • ProSe direct communication makes it possible to establish a communication path between two or more ProSe-enabled UEs existing in the direct communication range after, for example, the ProSe direct discovery procedure.
  • ProSe direct communication allows ProSe-enabled UEs to communicate with other ProSe-enabled UEs without going through a public land mobile communication network (Public Land Mobile Mobile Network (PLMN)) that includes a base station (eNodeB (eNB)). Allows to communicate directly with.
  • PLMN Public Land Mobile Mobile Network
  • eNB base station
  • ProSe direct communication may be performed using the same wireless communication technology (E-UTRA technology) as accessing the eNB, or Wireless Local Area Network (WLAN) wireless technology (ie, IEEE 802.11 radio technology). May be used.
  • E-UTRA technology wireless communication technology
  • WLAN Wireless Local Area Network
  • a radio link between radio terminals (UEs) used for direct communication or direct discovery is called a side link.
  • Sidelink transmission uses the same frame structure as the Long Term Evolution (LTE) frame structure defined for uplink and downlink, and uses a subset of uplink resources in frequency and time domain.
  • the radio terminal (UE) performs side link transmission using single carrier frequency division multiplexing (Single-Carrier-FDMA (Frequency-Division-Multiple Access), SC-FDMA) similar to the uplink.
  • Single-Carrier-FDMA Frequency-Division-Multiple Access
  • radio resources for side link transmission are allocated to UEs by radio access network (e.g., Evolved Universal Universal Terrestrial Radio Access Network (E-UTRAN)).
  • E-UTRAN Evolved Universal Universal Terrestrial Radio Access Network
  • a UE that is permitted to perform side link communication by ProSe function performs ProSe direct discovery or ProSe direct communication using radio resources allocated by radio access network nodes (e.g., eNodeB (eNB)).
  • eNodeB eNodeB
  • sidelink transmission mode 1 For ProSe direct communication, two resource allocation modes, namely scheduled resource resource allocation and scheduled resource resource allocation and automatic resource resource selection are called “sidelink transmission mode 1" and “sidelink transmission mode 2", respectively. .
  • a UE desires side link transmission
  • the UE requests radio resource allocation for side link transmission from the eNB
  • the eNB assigns resources for side link control and data.
  • Assign to the UE Specifically, the UE sends a scheduling request to the eNB to request an uplink (UL) data transmission resource (Uplink Shared Channel (UL-SCH) resource) and assigns it with an UL grant.
  • UL-SCH Uplink Shared Channel
  • UL-SCH Uplink Shared Channel
  • Send Sidelink Buffer Status Report (Sidelink BSR) to the eNB in the received UL data transmission resource.
  • the eNB determines a side link transmission resource to be allocated to the UE based on the Sidelink BSR, and transmits a side link grant (SL grant) to the UE.
  • SL grant side link grant
  • SL grant is defined as Downlink Control Information (DCI) format 5.
  • DCI Downlink Control Information
  • SL grant (DCI format ⁇ ⁇ 5) includes contents such as Resource for PSCCH, Resource block assignment and hopping allocation, and time resource pattern index.
  • Resource for PSCCH indicates a radio resource for a side link control channel (i.e., Physical Sidelink Control Channel (PSCCH)).
  • Resource block assignment and hopping allocation is a set of frequency resources, ie subcarriers (resource blocks), for transmitting sidelink data channels (ie, Physical Sidelink Shared Channel (PSSCH)) for data transmission on the sidelink Used to determine.
  • Time resource pattern index is used to determine a time resource for transmitting PSSCH, that is, a set of subframes.
  • a resource block means LTE and LTE-Advanced time-frequency resources, and a plurality of OFDM (or SC-FDMA) symbols continuous in the time domain and a plurality of consecutive OFDM symbols in the frequency domain.
  • one resource block includes 12 OFDM (or SC-FDMA) symbols continuous in the time domain and 12 subcarriers in the frequency domain. That is, Resource block assignment and hopping allocation and Time resource pattern index specify a resource block for transmitting PSSCH.
  • the UE that is, the side link transmission UE determines the PSCCH resource and the PSSCH resource according to SL grant.
  • the UE autonomously selects a resource for side link control (PSCCH) and data (PSSCH) from the resource pool set by the eNB.
  • the eNB may assign a resource pool to be used for autonomous resource selection in the System Information Block (SIB) 18 to the UE.
  • SIB System Information Block
  • the eNB may assign a resource pool to be used for autonomous resource selection to the UE of Radio Resource Control (RRC) _CONNECTED by dedicated RRC signaling. This resource pool may also be available when the UE is RRC_IDLE.
  • RRC Radio Resource Control
  • the UE on the transmission side (D2D transmitting UE) (hereinafter referred to as transmitting terminal or transmitting UE) is a radio resource region (resource pool) for the sidelink control channel (ie, PSCCH) Is used to transmit scheduling assignment information (SchedulingmentAssignment).
  • the scheduling allocation information is also called Sidelink, Control, Information, (SCI), format, 0.
  • the scheduling assignment information includes contents such as resource, block, assignment, and hopping, allocation, time, resource, pattern, index, and modulation, and coding, Scheme (MCS).
  • the resource block, assignment, and hopping resource allocation and time resource resource pattern index indicated by the scheduling resource assignment (SCI format 0) and the resource resource block assignment, and hopping resource allocation indicated by the SL resource grant (DCI resource format 5) received from the eNB follow time resource pattern index.
  • the transmitting UE transmits data in PSSCH using radio resources according to the scheduling allocation information.
  • a receiving UE receives scheduling assignment information from the transmitting UE on the PSCCH, and receives data on the PSSCH according to the scheduling assignment information.
  • the term “transmitting UE” is an expression that focuses on the transmission operation of the UE, and does not mean a UE dedicated to transmission.
  • the term “reception UE” is an expression that focuses on the reception operation of the UE, and does not mean a reception-dedicated UE. That is, the transmitting UE can perform a receiving operation, and the receiving UE can also perform a transmitting operation.
  • autonomous resource selection and scheduled resource allocation are called “sidelink discovery Type 1" and “sidelink discovery Type 2", respectively.
  • ProSe direct discovery autonomous resource selection (sidelink discovery Type 1) allows UEs that want to send discovery signals (ie, Physical Sidelink Shared Channel (PSDCH)) autonomously to use the resource pool from the resource pool. select. That is, in Sidelink discovery Type 1, radio resources are allocated without depending on the UE (on-a non-UE specific ⁇ basis).
  • discovery signals ie, Physical Sidelink Shared Channel (PSDCH)
  • the UE requests resource allocation for announcement from the eNB via RRC signaling.
  • the eNB allocates an announcement resource from the resource pool to the UE.
  • SIB 19 System Information Block
  • the eNB supports providing resources for monitoring ProSe direct discovery in System Information Block (SIB 19), but does not provide resources for announcements.
  • SIB 19 System Information Block
  • Type 2A two types, Type 2 A and Type 2 B, have been studied, but in Current Release 12 and Release 13 only Type 2 B is defined.
  • the eNB allocates radio resources to the UE semi-persistent for discovery signal (PSDCH) transmission.
  • PSDCH discovery signal
  • the eNB dynamically assigns radio resources for discovery signal (PSDCH) transmission for each discovery period (PSDCH period). Assign to UE.
  • the inventor found several problems related to D2D communication, and obtained several improvements to deal with these problems.
  • the radio resource is, for example, a time resource, a frequency resource, a time-frequency resource, an orthogonal code resource, a transmission power resource, or any combination thereof.
  • the radio resource is a time-frequency resource, and its minimum unit is the above-described resource block.
  • D2D communication pair in this specification means a pair of a D2D transmitting terminal (UE) and a D2D receiving terminal (UE) that perform D2D transmission.
  • the inventor allows the spatial reuse of the same radio resource by two D2D communication pairs that are not close to each other, but in accordance with an allocation rule that restricts the use of the same radio resource by two D2D communication pairs that are close to each other.
  • a radio resource allocation method was devised, including allocating radio resources for D2D transmission. This method can contribute to enabling efficient spatial reuse of radio resources between multiple D2D transmissions.
  • the inventor examined a method for estimating the transmission rate of side link transmission (D2D transmission) suitable for this method.
  • the estimated value of the transmission rate of side link transmission is, for example, radio resource scheduling, determination of whether or not to allow side link transmission to the UE (admission control), or the communication mode of D2D communication or cellular communication to the UE. It can be used for communication mode selection to determine whether to execute.
  • the inventor examined discovery reports to the base station by the UE.
  • the discovery report indicates the result of direct discovery by the UE.
  • the discovery report indicates a UE identifier (or UE group identifier) for identifying a UE (or UE group) discovered by the UE.
  • the UE identifier and UE group identifier are Layer-2 IDs used in one-to-many and one-to-one ProSe direct communications (ie, side link transmission using PSSCH). It is possible.
  • the Layer-2 ID is Prose UE ID, ProSe Relay UE ID, or Prose Layer-2 Group ID.
  • Prose UE ID and ProSe Relay UE ID are Layer-2 ID (Layer-2 ID for unicast communication) for unicast communication.
  • Prose Layer-2 Group ID is a link layer ID that identifies a UE group in one-to-many ProSe direct communication.
  • Prose UE ID, ProSe Relay UE ID, and Prose Layer-2 Group ID all have a length of 24 bits. Therefore, if these Prose Layer-2 IDs are included in the discovery report, the data size of the discovery report may increase.
  • the inventor examined radio frequency (Radio Frequency (RF)) measurement by the UE to assist the base station (eNB) to detect proximity between the UEs.
  • RF Radio Frequency
  • an architecture is conceivable in which the UE supports direct communication but does not support direct discovery.
  • Such an architecture requires a new approach to replace direct discovery to allow base stations (eNBs) to detect proximity between UEs.
  • the processing device includes a memory and at least one processor coupled to the memory.
  • the at least one processor is configured to determine one or more neighboring D2D communication pairs that are present in the vicinity of a first device-to-device (D2D) communications pair. Further, the at least one processor considers an influence of D2D transmission performed by the one or more neighboring D2D communication pairs, and sets a transmission rate of the first D2D transmission performed by the first D2D communication pair. It is configured to estimate.
  • D2D device-to-device
  • a transmission rate estimation method comprises: (a) determining one or more neighboring D2D communication pairs that are present in the vicinity of a first device-to-device (D2D) communication pair; and (b ) Estimating the transmission rate of the first D2D transmission performed by the first D2D communication pair in consideration of the influence of D2D transmission performed by the one or more neighboring D2D communication pairs.
  • D2D device-to-device
  • the wireless terminal includes a memory and at least one processor coupled to the memory.
  • the at least one processor is configured to receive from the base station a list indicating an identifier for distinguishing each of one or more wireless terminals or wireless terminal groups.
  • the at least one processor is configured to perform a discovery procedure for discovering the one or more wireless terminals or wireless terminal groups shown in the list.
  • the at least one processor is configured to transmit a discovery report indicating an index value for identifying each wireless terminal or each wireless terminal group discovered by the discovery procedure to the base station.
  • the bit size of the index value is smaller than the bit size of the identifier.
  • a method in a wireless terminal includes: (a) receiving a list indicating an identifier for distinguishing each of one or more wireless terminals or wireless terminal groups from a base station; (b) the list Performing a discovery procedure for discovering the one or more wireless terminals or wireless terminal groups shown in (1), and (c) identifying each wireless terminal or each wireless terminal group discovered by the discovery procedure Transmitting a discovery report indicating the index value of the base station to the base station.
  • the bit size of the index value is smaller than the bit size of the identifier.
  • the base station includes a memory and at least one processor coupled to the memory.
  • the at least one processor is configured to send a list indicating an identifier for distinguishing each of one or more wireless terminals or wireless terminal groups to the first wireless terminal.
  • the list is used by the first wireless terminal to perform a discovery procedure for discovering the one or more wireless terminals or wireless terminal groups shown in the list.
  • the at least one processor is configured to receive a discovery report indicating an index value for identifying each wireless terminal or each wireless terminal group discovered by the discovery procedure from the first wireless terminal. .
  • the bit size of the index value is smaller than the bit size of the identifier.
  • the method in the base station comprises: (A) transmitting a list indicating an identifier for distinguishing each of one or more wireless terminals or wireless terminal groups to the first wireless terminal, wherein the list is the 1 indicated in the list; Used by the first wireless terminal to perform a discovery procedure for discovering or more wireless terminals or wireless terminal groups; and (b) each wireless terminal or each wireless terminal discovered by the discovery procedure Receiving a discovery report indicating an index value for identifying a group from the first wireless terminal, wherein a bit size of the index value is smaller than a bit size of the identifier; including.
  • a wireless terminal includes a memory and at least one processor coupled to the memory.
  • the at least one processor performs received power measurements on each of a plurality of radio resources used for device-to-device (D2D) transmission or uplink transmission by one or more other wireless terminals. It is configured as follows. Further, the at least one processor is configured to transmit a measurement report indicating the result of the measurement to the base station directly or via any wireless terminal.
  • the plurality of radio resources are allocated to the one or more other radio terminals by the base station.
  • the measurement report indicates a reception power level in each radio resource, or a radio resource in which reception power equal to or higher than a predetermined threshold is detected or not detected.
  • a method in a wireless terminal includes: (a) each of a plurality of wireless resources used for device-to-device (D2D) transmission or uplink transmission by one or more other wireless terminals; And (b) transmitting a measurement report indicating the result of the measurement to the base station directly or via any wireless terminal.
  • the plurality of radio resources are allocated to the one or more other radio terminals by the base station.
  • the measurement report indicates a reception power level in each radio resource, or a radio resource in which reception power equal to or higher than a predetermined threshold is detected or not detected.
  • a base station includes a memory and at least one processor coupled to the memory.
  • the at least one processor is configured to receive a measurement report from a first wireless terminal directly or via any wireless terminal.
  • the measurement report includes the first radio of received power on each of a plurality of radio resources used for device-to-device (D2D) transmission or uplink transmission by one or more other radio terminals. The result of the measurement by the terminal is shown.
  • the plurality of radio resources are allocated to the one or more other radio terminals by the base station.
  • the measurement report indicates a reception power level in each radio resource, or a radio resource in which reception power equal to or higher than a predetermined threshold is detected or not detected.
  • the method in the base station includes receiving the measurement report from the first wireless terminal directly or via any wireless terminal.
  • the measurement report includes the first radio of received power on each of a plurality of radio resources used for device-to-device (D2D) transmission or uplink transmission by one or more other radio terminals.
  • the result of the measurement by the terminal is shown.
  • the plurality of radio resources are allocated to the one or more other radio terminals by the base station.
  • the measurement report indicates a reception power level in each radio resource, or a radio resource in which reception power equal to or higher than a predetermined threshold is detected or not detected.
  • the plurality of embodiments described below can be implemented independently or in appropriate combinations.
  • the plurality of embodiments have different novel features. Therefore, these multiple embodiments contribute to solving different purposes or problems and contribute to producing different effects.
  • LTE-Advanced 3GPP Release 12
  • LTE-Advanced Pro 3GPP Release 13
  • these embodiments are not limited to LTE-Advanced and LTE-Advanced Pro, and improvements thereof, and may be applied to D2D communication in other mobile communication networks or systems.
  • FIG. 1 shows a configuration example of a wireless communication network according to the present embodiment.
  • FIG. 1 shows D2D communication pairs 2A to 2D.
  • the D2D communication pair 2A includes a transmitting terminal (UE) 1A and a receiving terminal (UE) 1B.
  • the D2D communication pair 2B includes a transmission UE 1C and a reception UE 1D.
  • the D2D communication pair 2C includes a transmission UE 1E and a reception UE 1F.
  • the D2D communication pair 2D includes a transmission UE 1G and a reception UE 1H.
  • the transmission UE 1A performs D2D transmission (side link transmission) to the UE 1B on the D2D link 101A.
  • the D2D communication pair 2B simply refers to “UE1” using reference numeral 1 when describing matters common to a plurality of UEs including UE1A to 1H.
  • reference numeral 2 is used to simply refer to “D2D communication pair 2”.
  • the reference numeral 101 is used to simply refer to the “D2D link 101”.
  • UE1 has at least one wireless transceiver and is configured to perform D2D communication with one or more other UE1 over one or more D2D links (e.g., D2D link 101A).
  • the D2D link is called a PC5 interface or side link.
  • the D2D communication includes at least direct communication (i.e., ProSe Direct Communication), and may further include direct discovery (i.e., ProSe Direct Discovery).
  • ProSe ⁇ ⁇ Direct Communication is direct communication using side link transmission and is also called Sidelink Direct Communication.
  • ProSe Direct Discovery is direct discovery using side link transmission and is also called Sidelink Direct Discovery.
  • UE1 is comprised so that the cellular communication with eNB3 may be performed within the cellular coverage (cell) 31 provided by the base station (eNB) 3.
  • the eNB 3 is an entity arranged in a radio access network (ie, E-UTRAN), provides a cellular coverage 31 including one or a plurality of cells, and uses cellular communication technology (eg, E-UTRA) technology). Cellular communication can be performed with each UE1.
  • E-UTRAN radio access network
  • E-UTRA cellular communication technology
  • scheduled resource allocation is used for radio resource allocation for D2D transmission. That is, eNB3 communicates with transmission UE1 in each D2D communication pair 2, and allocates the radio
  • eNB3 allows spatial reuse of the same radio resource by two D2D communication pairs 2 that are not close to each other, but restricts the use of the same radio resource by two D2D communication pairs that are close to each other
  • the radio resource may be allocated to a plurality of D2D transmissions according to the allocation rule.
  • Some transmission rate estimation methods described in the present embodiment may be performed by the eNB 3, may be performed by any UE 1, or may be performed by other network entities (eg, ProSe Function, or Operation Administration). and Maintenance (OAM) server).
  • the estimated value of the D2D transmission rate obtained by some transmission rate estimation methods described in the present embodiment is, for example, radio resource scheduling, determination of whether or not to allow side link transmission to the UE, or communication mode of the UE Can be used for selection.
  • FIG. 2 is a flowchart showing an example (process 200) of estimating the transmission rate of D2D transmission by the D2D communication pair 2A.
  • the eNB 3 determines one or more neighboring D2D communication pairs existing in the vicinity of the D2D communication pair 2A. In other words, the eNB 3 determines the proximity between the D2D communication pair 2A and another D2D communication pair.
  • the eNB 3 detects two D2D communication pairs 2B and 2C as neighboring D2D communication pairs of the D2D communication pair 2A.
  • either or both of the UE 1A and UE 1B in the D2D communication pair 2A may directly execute the discovery procedure and inform the eNB 3 of the other UE 1 that has been discovered.
  • either or both of UE1C and UE1D in the D2D communication pair 2B may directly execute a discovery procedure and inform the eNB 3 of other discovered UE1s.
  • either or both of UE1E and UE1F in the D2D communication pair 2C may directly execute the discovery procedure and inform the eNB 3 of other discovered UE1s.
  • the eNB 3 may determine the proximity relationship between the D2D communication pairs 2 based on discovery reports from one or more UEs 1.
  • the eNB 3 is information indicating a proximity relationship between the UE 1 from another network entity (eg, ProSe Function, or OAM server) or a proximity relationship between the D2D communication pair 2. And the proximity relationship between the D2D communication pair 2 may be determined.
  • another network entity eg, ProSe Function, or OAM server
  • the eNB 3 uses the improved discovery report described in the second embodiment or the proximity detection procedure between UEs described in the third embodiment. It may be used to determine the proximity relationship between the D2D communication pair 2.
  • the eNB 3 estimates the transmission rate of the D2D transmission performed by the target D2D communication pair 2A in consideration of the influence of the D2D transmission performed by the neighboring D2D communication pairs 2B and 2C. Specifically, the eNB 3 considers that the three D2D communication pairs 2A, 2B, and 2C having proximity relations cannot use the same radio resource, that is, cannot simultaneously transmit on the same frequency resource. As a result, a radio resource allocation method that allows the spatial reuse of the same radio resource by two D2D communication pairs that are not close to each other but restricts the use of the same radio resource by two D2D communication pairs that are close to each other is used. In this case, an estimated value of the transmission rate of D2D transmission suitable for the allocation method can be obtained.
  • the eNB 3 may allocate D2D radio resources to these multiple D2D transmissions in consideration of fairness among multiple D2D transmissions. In this case, as illustrated in FIG. 3, the eNB 3 may estimate the transmission rate of the D2D communication pair 2 ⁇ / b> A using a weight value that decreases as the number of one or more neighboring D2D communication pairs increases. Good.
  • FIG. 3 is a flowchart showing one specific example (process 300) of the transmission rate estimation method shown in FIG.
  • the process in step 301 is the same as the process in step 201 of FIG.
  • the eNB 3 estimates the transmission rate of the D2D communication pair 2A using a weight value that decreases as the number of neighboring D2D communication pairs (eg, D2D communication pairs 2B and 2C) increases.
  • the eNB 3 calculates the transmission rate of D2D transmission by the D2D communication pair 2A by multiplying the transmission rate estimation value based on the Signal to interference plus noise ratio (SINR) at the receiver input of the receiving UE 1B by the weight value. Also good.
  • SINR Signal to interference plus noise ratio
  • the weight value may be inversely proportional to the number of neighboring D2D communication pairs, for example.
  • the transmission rate C of the D2D communication pair 2A may be calculated according to the following equation (1), for example:
  • M is the number of neighboring D2D communication pairs including the D2D communication pair 2A
  • B is a bandwidth (radio resource) that can be used for D2D communication
  • SINR is SINR at the receiver input of the receiving UE 1B.
  • Blog (1 + SINR) which is a term of the expression (1), represents a communication capacity when the D2D communication pair 2A occupies a bandwidth (radio resource) that can be used for D2D communication.
  • a transmission rate based on D2D radio resources that each of a plurality of D2D communication pairs (eg, D2D communication pairs 2A, 2B, and 2C) close to each other can use on average. Can be estimated.
  • the eNB 3 may impose a guaranteed bit rate (GBR) constraint on radio resource scheduling for each D2D transmission.
  • the eNB 3 may guarantee the GBR for each D2D transmission.
  • the eNB 3 uses the weight value that decreases with an increase in the usage rate of the D2D radio resource by one or more neighboring D2D communication pairs, and the transmission rate of the D2D communication pair 2A. May be estimated.
  • the usage rate of the D2D radio resource by each neighboring D2D communication pair may be a radio resource usage rate required to guarantee the GBR of the D2D transmission performed by each neighboring D2D communication pair.
  • FIG. 4 is a flowchart showing one specific example (process 400) of the transmission rate estimation method shown in FIG.
  • the process in step 401 is the same as the process in step 201 of FIG.
  • the eNB 3 estimates the transmission rate of the D2D communication pair 2A by using a weight value that decreases as the usage rate of the D2D radio resource by the neighboring D2D communication pairs (eg, D2D communication pairs 2B and 2C) increases. To do.
  • the eNB 3 may calculate the transmission rate of D2D transmission by the D2D communication pair 2A by multiplying the transmission rate estimation value based on SINR at the receiver input of the receiving UE 1B by the weight value.
  • the transmission rate C of the D2D communication pair 2A may be calculated according to the following equation (2), for example:
  • Pn is the usage rate of the D2D radio resource by the neighboring D2D communication pair 2n
  • B is a bandwidth (radio resource) that can be used for D2D communication
  • SINR is SINR at the receiver input of the receiving UE 1B.
  • the transmission rate is estimated based on the D2D radio resources that can be actually used by the target D2D communication pair 2A, excluding the D2D radio resources necessary for GBR guarantee of the nearby D2D communication pair. it can.
  • the eNB 3 may determine the proximity relationship between a plurality of neighboring D2D communication pairs (eg, D2D communication pairs 2B and 2C) when estimating the transmission rate of D2D transmission of the target D2D communication pair 2A. May be further considered. It should be noted that when there is no proximity relationship between a plurality of D2D communication pairs, the plurality of D2D communication pairs can spatially reuse the same radio resource. Therefore, when the eNB 3 determines that there is no proximity relationship between the neighboring D2D communication pairs 2B and 2C, only one of the neighboring D2D communication pairs 2B and 2C is transmitted at the transmission rate of the D2D transmission of the target D2D communication pair 2A. May be taken into account. Thereby, the estimation accuracy of the transmission rate of D2D transmission can be improved.
  • a plurality of neighboring D2D communication pairs eg, D2D communication pairs 2B and 2C
  • FIGS. 5A and 5B Specific examples will be described with reference to FIGS. 5A and 5B.
  • the eNB 3 considers both the D2D communication pair 2B and the D2D communication pair 2C when estimating the transmission rate of the D2D transmission of the target D2D communication pair 2A.
  • the eNB 3 considers only one of the D2D communication pair 2B and the D2D communication pair 2C when estimating the transmission rate of D2D transmission of the target D2D communication pair 2A.
  • the eNB 3 sets M to “3” in the example of FIG. In the example of 5B, M is set to “2”.
  • the eNB 3 uses the D2D communication pair 2B and the D2D communication pair 2C in the example of FIG. 5A. Considering both radio resource usage rates, in the example of FIG. 5B, only the maximum value of the resource usage rates of the D2D communication pair 2B and the D2D communication pair 2C is considered.
  • the eNB 3 may further consider the allocation history of D2D radio resources for neighboring D2D communication pairs (e.g., D2D communication pairs 2B and 2C).
  • FIG. 6 is a flowchart showing one specific example (process 600) of the transmission rate estimation method shown in FIG.
  • the process in step 601 is the same as the process in step 201 of FIG.
  • the eNB 3 predicts the occurrence of future D2D transmissions by neighboring D2D communication pairs (e.g., D2D communication pairs 2B and 2C) based on the allocation history of D2D radio resources to these neighboring D2D communication pairs.
  • the eNB 3 may estimate the transmission rate of the D2D transmission of the target D2D communication pair 2A in consideration of the D2D radio resources used by the predicted future D2D transmission of these neighboring D2D communication pairs. . According to the method shown in FIG. 6, it is possible to improve the estimation accuracy of the transmission rate of 2D transmission.
  • the eNB 3 executes a method for estimating the transmission rate of D2D transmission.
  • these methods may be performed by any UE 1 or by other network entities (e.g., ProSe Function, or OAM server).
  • FIG. 7 shows a configuration example of a wireless communication network according to the present embodiment.
  • Each UE1 has at least one radio transceiver and is configured to perform D2D communication with one or more other UE1 over one or more D2D links.
  • UE1 is comprised so that the cellular communication with eNB3 may be performed within the cellular coverage (cell) 31 provided by the base station (eNB) 3.
  • the eNB 3 is an entity arranged in a radio access network (ie, E-UTRAN), provides a cellular coverage 31 including one or more cells, and uses cellular communication technology (eg, E-UTRA technology). Cellular communication can be performed with each UE1.
  • E-UTRAN radio access network
  • E-UTRA cellular communication technology
  • eNB3 transmits UE identifier list (UE (ID list) 710 to UE1A.
  • UE ID list 710 indicates one or more other UE1 UE identifiers that eNB3 desires to be searched by the discovery procedure by UE1A.
  • the UE ID list 710 may indicate one or more UE group identifiers.
  • the UE identifier and the UE group identifier may be IDs used or detectable in the direct discovery procedure by the UE 1A.
  • the UE identifier and UE group identifier are Layer-2 IDs used in one-to-many and one-to-one ProSe direct communications (ie, side link transmission using PSSCH). May be.
  • the Layer-2 ID is Prose UE ID or ProSe Relay UE ID or Prose Layer-2 Group ID.
  • Prose UE ID and ProSe Relay UE ID are Layer-2 ID (Layer-2 ID for unicast communication) for unicast communication.
  • Prose Layer-2 Group ID is a link layer ID that identifies a UE group in one-to-many ProSe direct communication.
  • Prose UE ID, ProSe Relay UE ID, and Prose Layer-2 Group ID all have a length of 24 bits.
  • the UE group identifier may be Discovery Group ID.
  • Discovery Group ID is used in group member discovery and is wirelessly transmitted by an announcing UE (for model A), or discovererdisUE or discoveree UE (for model B).
  • Discovery Group ID is the same as ProSe Layer-2 Group ID and is assumed to have the same bit size as ProSe Layer-2 Group ID.
  • the UE identifier may be a User Info ID that is also used in group member discovery. User Info ID is also wirelessly transmitted by announcing UE (in case of model A), or discoverer UE or discoveree UE (in case of model B). User Info ID has a length of 48 bits.
  • the UE1A directly performs a discovery and transmits a discovery report 712 to eNB3.
  • the discovery report 712 indicates whether UE1 (or UE group) corresponding to the UE identifier (or UE group identifier) included in the UE ID list 710 has been discovered. More specifically, the discovery report 712 indicates an index value for specifying each UE 1 or each UE group discovered by the discovery procedure.
  • the index value is associated with one UE identifier (or UE group identifier) on a one-to-one basis by the UE10ID list 710. Furthermore, the data size of the index value is smaller than the bit size (data size) of the UE identifier (or UE group identifier).
  • the index value may be an item number given to each UE identifier included in the UE ID list 710. For example, each UE identifier (e.g., “Layer-2” ID) may have a 24-bit length, and each index value may have a 4-bit length. An index value having a 4-bit length can distinguish up to 16 UE1s or UE groups.
  • ENB3 may use discovery report 712 for scheduling of D2D radio resources.
  • the discovery report 712 for scheduling, it is necessary to associate the Sidelink Radio Network Temporary Identifier (SL-RNTI), which is an identifier used for scheduling D2D radio resources, with the UE identifier used in the discovery report 712. .
  • SL-RNTI Sidelink Radio Network Temporary Identifier
  • the UE identifier used in the discovery report 712 can be added to the Sidelink UE information message.
  • the Sidelink UE information message is an RRC message transmitted from the UE to the eNB.
  • the eNB 3 may use the discovery report 712 to determine whether or not to allow direct communication to the UE 1.
  • the eNB 3 may transmit a plurality of UE ID lists 710 to the UE 1A.
  • the plurality of UE ID lists 710 indicate different subsets of UEs or UE groups, for example.
  • the eNB 3 may transmit a plurality of UE ID lists 710 at the same time or may transmit them separately.
  • UE1A may transmit a plurality of discovery reports 712 corresponding to a plurality of UE ID lists 710 to eNB3. Instead of this, the UE 1A may transmit one discovery report 712 related to the plurality of UE ID lists 710 to the eNB 3.
  • the index value described in the discovery report 712 for specifying each discovered UE1 or each UE group may include the identifier of the UE ID list 710.
  • the index value may be a combination of the identifier of the UE ID list 710 and the item number of each UE (or UE group) in the list.
  • FIG. 8 is a sequence diagram showing an example (process 800) of the discovery procedure according to the present embodiment.
  • the eNB 3 transmits a discovery setting including the UE ID list 710 to the UE 1A.
  • Step 802 the UE 1A directly executes a discovery procedure.
  • another UE1 eg, UE1B
  • UE1A may operate as an announcing UE that transmits a discovery signal
  • UE1A may operate as a monitoring UE that detects a discovery signal.
  • UE1A operates as a discoverer UE that transmits a discovery signal
  • another UE1 transmits a response message to the discovery signal to UE1A. It operates as discoveree ⁇ UE, and UE1A may discover other UE1 by receiving a response message from other UE1.
  • the UE 1A transmits a discovery report 712 to the eNB 3.
  • the discovery report 712 indicates the index value of UE1 detected in the direct discovery procedure (812).
  • the discovery report 712 indicates an index value instead of the UE identifier (or UE group identifier), and the bit size of the index value is larger than the bit size of the UE identifier (or UE group identifier). small. Therefore, according to the present embodiment, the data size of the discovery report 712 can be reduced.
  • eNB3 can specify UE1A which wishes to be searched by the discovery procedure by UE1A to UE1A using UE ID list 710.
  • the eNB 3 may select a subset of multiple UEs 1 (or multiple UE groups) located within the cell 31 and include the selected subset in the UE ID list 710.
  • eNB3 may not want UE1A to report discovery of UEs that may not use the same radio resources as UE1A. unknown. Therefore, eNB3 may select a subset including one or more UE1 that may use the same radio resource as UE1A, and include the selected subset in UE ⁇ ⁇ ⁇ ⁇ ID list 710.
  • the subset includes one or more UE1 (or a plurality of UE1 (or a plurality of UE groups) located in the cell 31 that perform D2D transmission or are permitted to perform D2D transmission). UE group).
  • wireless resource can be excluded from the discovery report 712.
  • each UE 1 is configured to perform reception power measurement (RF measurement) in each of a plurality of radio resources used for D2D transmission or uplink transmission by one or more other UEs. Has been.
  • wireless resource is allocated by these one or more other UE by eNB3.
  • each UE 1 is configured to transmit a measurement report indicating the result of the RF measurement to the eNB 3 directly or via any other UE 1.
  • the measurement report indicates a reception power level in each radio resource, a radio resource in which reception power equal to or higher than a predetermined threshold is detected, or a radio resource in which reception power higher than a predetermined threshold is not detected.
  • eNB3 can use the measurement report from UE1 in order to detect the proximity
  • UE1 only needs to detect the reception power of the signal from other UE1 in RF measurement.
  • UE1 is not required to decode signals from other UE1 in RF measurements, nor is it required to identify other UE1. Therefore, even a transmission signal not destined for UE1 itself can be used for RF measurement by UE1 for supporting proximity detection between UEs.
  • RF measurements according to this embodiment can be used to enable eNB 3 to detect the proximity of UE 1 in architectures where UE 1 supports direct communication but does not support direct discovery.
  • FIG. 9 is a flowchart showing an example of the operation of UE 1 according to the present embodiment (processing 900).
  • UE1 performs reception power measurement (RF measurement) on each of a plurality of radio resources used for D2D transmission or uplink transmission by one or more other UEs.
  • UE1 transmits the measurement report (measurement report) which shows the result of the said RF measurement to eNB3 directly or via any other UE1.
  • FIG. 10 is a flowchart showing an example of operation of the eNB 3 according to the present embodiment (processing 1000).
  • eNB3 receives the measurement report which shows the measurement result in D2D radio
  • eNB3 detects proximity of UE1 which performed measurement report, and other UE1 based on the received measurement report.
  • FIG. 11 is a sequence diagram showing an example of the measurement report procedure (processing 1100) according to the present embodiment.
  • eNB3 transmits measurement setting (measurement
  • the measurement setting requests UE1 to perform RF measurement.
  • the measurement setting may specify a radio resource (e.g., subframe or resource block or both) on which RF measurement is to be performed.
  • the eNB 3 may allocate radio resources for D2D transmission or UL transmission to the UE to be detected and specify the radio resources allocated to the UE to be detected in the measurement settings. Thereby, eNB3 can use RF measurement by UE1, and its report, in order to detect proximity between UE1 and specific UE which should be detected.
  • the measurement setting may specify a transmission period in which RF measurement should be performed.
  • the transmission period may be a subframe, a PSCCH period, or a PSDCH period.
  • the PSCCH period is also called a sidelink control period.
  • the PSCCH period is necessary to determine radio resources (i.e., subframes and resources blocks) for transmitting PSCCH and radio resources for transmitting PSSCH.
  • the PSCCH is a side link physical channel used for transmission of side link control information (Sidelink Control Information (SCI)) such as scheduling allocation information.
  • SCI Sidelink Control Information
  • PSSCH is a side link physical channel used for user data transmission (direct transmission).
  • the PSCCH period is 40 ms, 60 ms, 70 ms, 80 ms, 120 ms, 140 ms, 160 ms, 240 ms, 280 ms, or 320 ms.
  • the PSCCH period is 40 subframes, 60 subframes, 70 subframes, 80 subframes, 120 subframes, 140 subframes, 160 subframes, 240 subframes, 280 subframes, or 320 subframes.
  • the PSDCH period is set by the eNB 3 to specify the subframe pool for direct discovery.
  • the PSDCH period is also called a discovery period.
  • the length of the PSDCH period is 32, 64, 128, 256, 512, or 1024 radio frames.
  • a 3GPP radio frame has a length of 10 milliseconds and is composed of 10 subframes. The length of one subframe is 1 millisecond.
  • the length of the PSDCH period is 320, 640, 1280, 2560, 5120, or 10240 subframes.
  • UE1 performs RF measurement with D2D radio resources or uplink (UL) radio resources according to the measurement settings.
  • UE1 transmits a measurement report to eNB3.
  • the measurement report indicates a reception power level in each radio resource, a radio resource in which reception power equal to or higher than a predetermined threshold is detected, or a radio resource in which reception power higher than a predetermined threshold is not detected.
  • the measurement report may include the Prose UE ID of the source UE of the measurement report.
  • ProSe UE ID may be included in the measurement report.
  • Sidelink UE information may be included in Sidelink UE information.
  • the eNB 3 approaches the UE pair that performs transmission / reception of the side link by comparing the Prose UE ID of the transmission source UE (side link reception UE) of the measurement report with the unicast destination notified from the side link transmission UE. Another UE can be grasped, and the presence of the other neighboring UE can be considered when scheduling D2D radio resources to the UE pair.
  • the eNB 3 can know the unicast destination by the Sidelink UE information message or Sidelink Buffer Status Report (BSR) received from the side link transmission UE.
  • the UE that desires side link transmission transmits Sidelink UE information to the eNB 3 in advance.
  • the Sidelink UE information message is an RRC message transmitted from the UE to the eNB.
  • the SL-DestinationInfoListUC information element included in the Sidelink UE information message indicates the destination of unicast sidelink transmission.
  • the unicast destination is specified by Layer-2 ID for unicast communication (i.e., Prose UE ID or ProSe Relay UE ID).
  • UE desiring sidelink transmission transmits Sidelink BSR to eNB3.
  • Sidelink BSR is Medium Access Control (MAC) Control Element (CE).
  • the Destination Index field included in the Sidelink / BSR / MAC / CE specifies the destination of the side link transmission.
  • the Destination Index field indicates Layer-2 ID for unicast communication (i.e., Prose UE ID or ProSe Relay UE ID).
  • the eNB 3 may select a subset of multiple UEs 1 (or multiple UE groups) located within the cell 31 and request RF measurements and measurement reports from the selected subset.
  • the subset may be a transmission UE or a reception UE involved in D2D transmission (side link transmission) among a plurality of UEs 1 (or a plurality of UE groups) located in the cell 31.
  • eNB3 can use a measurement report effectively for scheduling of D2D radio
  • UE1 may perform RF measurements in a PSCCH resource region, a PSSCH resource region, a PSDCH resource region, a Physical-Uplink-Shared-Channel (PUSCH) resource region, or a Physical-Uplink-Control.-Channel (PUCCH) resource region. .
  • PUSCH Physical-Uplink-Shared-Channel
  • PUCCH Physical-Uplink-Control.-Channel
  • UE1 may perform RF measurements on radio resources used for D2D transmission.
  • the radio resources used for D2D transmission are resources that are not used for uplink transmission and are reserved by eNB3 to be used for D2D transmission and allocated to one or more UEs by eNB3. It is preferable.
  • the RF measurement by UE1 may be performed in the PSCCH resource pool.
  • the eNB 3 can exclusively allocate the PSCCH resource pool only to the PSCCH. Therefore, eNB3 can determine that the received power detected by RF measurement by UE1 originates from PSCCH transmission by any UE.
  • RF measurement by UE1 may be performed in the PSSCH resource pool.
  • the eNB 3 can exclusively allocate resources in the PSSCH resource pool only to the PSSCH. Therefore, eNB3 can determine that the received power detected by the RF measurement by UE1 is derived from PSSCH transmission by any UE.
  • uplink data transmission is also performed in the PSSCH resource pool. Therefore, the eNB 3 must specify the measurement target resource in the PSSCH resource pool in detail in the measurement setting (step 1101).
  • the PSCCH resource pool is generally used only for PSCCH transmission and is not used for uplink data transmission (PUSCH transmission). Therefore, if UE1 measures a PSCCH resource pool, there exists an advantage that it does not need to receive designation
  • the UE that is transmitting in the PSCCH resource pool is a UE that is using the side link, there is a possibility that the eNB 3 may want to determine whether the radio resource can be shared when scheduling the D2D radio resource. There is also the advantage that the measurement report is likely to be useful.
  • the RF measurement by UE1 may be performed in the PSDCH resource pool.
  • the PSDCH resource pool is also called a discovery resource pool.
  • the resource pool for PSCCH consists of L PSCCH subframes and M PSCCH_RP RB frequency domain resource blocks in the PSCCH period.
  • a method for specifying a resource pool for PSCCH will be described with reference to FIGS.
  • the resource pool for PSCCH consists of a subframe pool and a resource block pool.
  • FIG. 13 shows a subframe pool for PSCCH
  • FIG. 14 shows a resource block pool for PSCCH.
  • the eNB specifies the length of the side link control period (PSCCH period) (P), as well as the subframe bitmap for PSCCH and its length (N ') to identify the subframe pool for PSCCH. Is specified.
  • the length (N ′) of the subframe bitmap is 4, 8, 12, 16, 30, 40 or 42 bits. As shown in FIG. 13, the N ′ subframe corresponding to the subframe bitmap is the first N ′ subframe in the side link control period.
  • the subframe bitmap indicates that the subframe corresponding to the bit set to “0” is not used for PSCCH transmission, and the subframe corresponding to the bit set to “1” can be used for PSCCH transmission. Show.
  • the number of subframes (L PSCCH ) included in the PSCCH resource pool within one side link control period is equal to the number specified as 1 in the subframe bitmap.
  • the subframes included in the PSCCH resource pool ie, subframe pool
  • the eNB specifies the index (S1) of the start (start) Physical) Resource Block (PRB) and the index of the end (end) PRB (in order to identify the resource block pool for PSCCH ( Specify S2) and the number of PRBs (M).
  • the eNB specifies a subframe pool for PSSCH by SIB 18 or dedicated signaling (RRC signaling).
  • the side link control period (PSCCH period) associated with the PSCCH resource setting is further associated with the PSSCH resource setting.
  • the UE determines a PSSCH resource pool composed of subframe pools as follows. That is, as shown in FIG. 13, in the side links control period (PSCCH period), each subframe having the same or subframe index greater than this and l PSCCH _ ⁇ L PSCCH -1 ⁇ + 1 is, PSSCH Belongs to the subframe pool for.
  • Discovery resource pool consists of subframe pool and resource block pool.
  • the eNB 3 specifies the length of the PSDCH period (discovery period) (P), the number of repetitions of the subframe bitmap within the PSDCH period (NR), and the subframe bitmap to identify the subframe pool. And its length (NB).
  • the length (P) of the discovery period is 32, 64, 128, 256, 512, or 1024 radio frames.
  • the length (N B ) of the subframe bitmap is 4, 8, 12, 16, 30, 40 or 42 bits.
  • the subframe bitmap indicates that the subframe corresponding to the bit set to “0” is not used for discovery, and the subframe corresponding to the bit set to “1” can be used for discovery.
  • the maximum number of subframe bitmap repetitions (N R ) within the discovery period depends on the duplex mode, frequency division duplex (FDD) or time division duplex (TDD), and UL / DL for TDD Depends on configuration. Specifically, the maximum number of repetitions (N R ) is 5 for FDD and TDD UL / DL configuration 0, 13 for TDD UL / DL configuration 1, and TDD UL / DL. Value 25 for configuration 2, value 17 for TDD UL / DL configuration 3, value 25 for TDD UL / DL configuration 4, and value 50 for TDD UL / DL configuration 5. In the case of TDD UL / DL configuration 6, the value is 7.
  • the number of subframes (L PSDCH ) included in the discovery resource pool corresponding to one discovery period is multiplied by the number of repetitions (N R ) by the number specified by the value 1 in the subframe bitmap. It is obtained with.
  • the length (N B ) of the subframe bitmap is 8 bits, and the number of repetitions (N R ) is 5.
  • 3 bits out of 8 bits in one subframe bitmap are set to use (value “1”) (hatched subframe in FIG. 15). Therefore, the number of subframes (L PSDCH ) included in the discovery resource pool is 15.
  • eNB3 specifies the index (S1) of the start (start) Physical) Resource Block (PRB), the index (S2) of the end (end) PRB, and the number of PRBs (M) to identify the resource block pool To do.
  • the measurement report may further indicate one or more transmission periods for which measurements by UE1 were made.
  • the transmission period may be a subframe, a PSCCH period, or a PSDCH period.
  • FIG. 16 is a block diagram illustrating a configuration example of UE1.
  • the Radio-Frequency (RF) transceiver 1601 performs analog RF signal processing to communicate with the eNB 3.
  • Analog RF signal processing performed by the RF transceiver 1601 includes frequency up-conversion, frequency down-conversion, and amplification.
  • RF transceiver 1601 is coupled to antenna 1602 and baseband processor 1603. That is, the RF transceiver 1601 receives modulation symbol data (or OFDM symbol data) from the baseband processor 1603, generates a transmission RF signal, and supplies the transmission RF signal to the antenna 1602. Further, the RF transceiver 1601 generates a baseband received signal based on the received RF signal received by the antenna 1602 and supplies this to the baseband processor 1603.
  • modulation symbol data or OFDM symbol data
  • the RF transceiver 1601 may also be used for side link communication with other UEs.
  • RF transceiver 1601 may include multiple transceivers.
  • the baseband processor 1603 performs digital baseband signal processing (data plane processing) and control plane processing for wireless communication.
  • Digital baseband signal processing consists of (a) data compression / decompression, (b) data segmentation / concatenation, (c) ⁇ transmission format (transmission frame) generation / decomposition, and (d) transmission path encoding / decoding. , (E) modulation (symbol mapping) / demodulation, and (f) generation of OFDM symbol data (baseband OFDM signal) by Inverse Fast Fourier Transform (IFFT).
  • control plane processing includes layer 1 (eg, transmission power control), layer 2 (eg, radio resource management, hybrid automatic repeat request (HARQ) processing), and layer 3 (eg, attach, mobility, and call management). Communication management).
  • the digital baseband signal processing by the baseband processor 1603 includes signal processing of Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, MAC layer, and PHY layer. But you can.
  • the control plane processing by the baseband processor 1603 may include Non-Access-Stratum (NAS) protocol, RRC protocol, and MAC CE processing.
  • NAS Non-Access-Stratum
  • the baseband processor 1603 includes a modem processor (eg, Digital Signal Processor (DSP)) that performs digital baseband signal processing and a protocol stack processor (eg, Central Processing Unit (CPU) that performs control plane processing, or Micro Processing Unit. (MPU)).
  • DSP Digital Signal Processor
  • protocol stack processor eg, Central Processing Unit (CPU) that performs control plane processing, or Micro Processing Unit. (MPU)
  • CPU Central Processing Unit
  • MPU Micro Processing Unit.
  • a protocol stack processor that performs control plane processing may be shared with an application processor 1604 described later.
  • Application processor 1604 is also referred to as a CPU, MPU, microprocessor, or processor core.
  • the application processor 1604 may include a plurality of processors (a plurality of processor cores).
  • the application processor 1604 is a system software program (Operating System (OS)) read from the memory 1606 or a memory (not shown) and various application programs (for example, call application, web browser, mailer, camera operation application, music playback)
  • OS Operating System
  • application programs for example, call application, web browser, mailer, camera operation application, music playback
  • Various functions of UE1 are realized by executing (application).
  • the baseband processor 1603 and application processor 1604 may be integrated on a single chip, as shown by the dashed line (1605) in FIG.
  • the baseband processor 1603 and the application processor 1604 may be implemented as one System on Chip (SoC) device 1605.
  • SoC System on Chip
  • An SoC device is sometimes called a system Large Scale Integration (LSI) or chipset.
  • the memory 1606 is a volatile memory, a nonvolatile memory, or a combination thereof.
  • the memory 1606 may include a plurality of physically independent memory devices.
  • the volatile memory is, for example, Static Random Access Memory (SRAM), Dynamic RAM (DRAM), or a combination thereof.
  • the non-volatile memory is a mask Read Only Memory (MROM), Electrically Erasable Programmable ROM (EEPROM), flash memory, hard disk drive, or any combination thereof.
  • the memory 1606 may include an external memory device accessible from the baseband processor 1603, the application processor 1604, and the SoC 1605.
  • the memory 1606 may include an embedded memory device integrated within the baseband processor 1603, the application processor 1604, or the SoC 1605.
  • the memory 1606 may include a memory in a Universal Integrated Circuit Card (UICC).
  • UICC Universal Integrated Circuit Card
  • the memory 1606 may store a software module (computer program) including an instruction group and data for performing processing by the UE 1 described in the above-described embodiments.
  • the baseband processor 1603 or the application processor 1604 is configured to read the software module from the memory 1606 and execute it, thereby performing the processing of UE1 described with reference to the drawings in the above-described embodiment. May be.
  • FIG. 17 is a block diagram illustrating a configuration example of the eNB 3 according to the above-described embodiment.
  • the eNB 3 includes an RF transceiver 1701, a network interface 1703, a processor 1704, and a memory 1705.
  • the RF transceiver 1701 performs analog RF signal processing to communicate with UE1.
  • the RF transceiver 1701 may include multiple transceivers.
  • RF transceiver 1701 is coupled to antenna 1702 and processor 1704.
  • the RF transceiver 1701 receives modulation symbol data (or OFDM symbol data) from the processor 1704, generates a transmission RF signal, and supplies the transmission RF signal to the antenna 1702. Further, the RF transceiver 1701 generates a baseband received signal based on the received RF signal received by the antenna 1702, and supplies this to the processor 1704.
  • the network interface 1703 is used to communicate with network nodes (e.g., Mobility Management Entity (MME) and Serving Gateway (S-GW)).
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • the network interface 1703 may include, for example, a network interface card (NIC) compliant with IEEE 802.3 series.
  • NIC network interface card
  • the processor 1704 performs digital baseband signal processing (data plane processing) and control plane processing for wireless communication.
  • the digital baseband signal processing by the processor 1704 may include PDCP layer, RLC layer, MAC layer, and PHY layer signal processing.
  • the control plane processing by the processor 1704 may include S1 protocol, RRC protocol, and MAC-CE processing.
  • the processor 1704 may include a plurality of processors.
  • the processor 1704 may include a modem processor (e.g., DSP) that performs digital baseband signal processing and a protocol stack processor (e.g., CPU or MPU) that performs control plane processing.
  • DSP digital baseband signal processing
  • protocol stack processor e.g., CPU or MPU
  • the memory 1705 is configured by a combination of a volatile memory and a nonvolatile memory.
  • the volatile memory is, for example, SRAM or DRAM or a combination thereof.
  • the non-volatile memory is, for example, an MROM, PROM, flash memory, hard disk drive, or a combination thereof.
  • Memory 1705 may include storage located remotely from processor 1704. In this case, the processor 1704 may access the memory 1705 via the network interface 1703 or an I / O interface not shown.
  • the memory 1705 may store a software module (computer program) including an instruction group and data for performing processing by the eNB 3 described in the plurality of embodiments.
  • the processor 1704 may be configured to read and execute the software module from the memory 1705 to perform the eNB3 process described using the drawings in the above-described embodiment.
  • each of the processors included in the UE 1 and the eNB 3 includes one or more instructions including a group of instructions for causing a computer to execute the algorithm described with reference to the drawings. Run multiple programs.
  • the program can be stored and supplied to a computer using various types of non-transitory computer readable media.
  • Non-transitory computer readable media include various types of tangible storage media (tangible storage medium).
  • non-transitory computer-readable media are magnetic recording media (eg flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg magneto-optical discs), Compact Disc Read Only Memory (CD-ROM), CD-ROM R, CD-R / W, semiconductor memory (for example, mask ROM, Programmable ROM (PROM), Erasable PROM (EPROM), flash ROM, Random Access Memory (RAM)).
  • the program may also be supplied to the computer by various types of temporary computer-readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves.
  • the temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.
  • the processing and operations performed by the eNB 3 described in the above embodiment may be provided by a combination of Digital Unit (DU) or DU and Radio Unit (RU) included in the Cloud Radio Access Network (C-RAN) architecture.
  • DU is called Baseband Unit (BBU).
  • RU is also called Remote Radio Head (RRH) or Remote Radio Equipment (RRE). That is, the process and operation performed by the eNB 3 described in the above embodiment may be provided by any one or a plurality of radio stations (RAN nodes).
  • (Appendix A1) A wireless terminal, Memory, At least one processor coupled to the memory; With The at least one processor is configured to receive from the base station a list indicating an identifier for distinguishing each of one or more wireless terminals or wireless terminal groups; The at least one processor is configured to perform a discovery procedure for discovering the one or more wireless terminals or wireless terminal groups indicated in the list; The at least one processor is configured to transmit a discovery report indicating an index value for identifying each wireless terminal or each wireless terminal group discovered by the discovery procedure to the base station; The bit size of the index value is smaller than the bit size of the identifier, Wireless terminal.
  • Appendix A2 The identifier is used in the discovery procedure.
  • the identifier includes at least one of Prose UE ID, ProSe Relay UE ID, ProSe Layer-2 Group ID, and Discovery Group ID.
  • the wireless terminal according to any one of appendices A1 to A3.
  • (Appendix A5) A method in a wireless terminal, Receiving from the base station a list indicating an identifier for distinguishing each of one or more wireless terminals or wireless terminal groups; Performing a discovery procedure for discovering the one or more wireless terminals or wireless terminal groups indicated in the list, and identifying each wireless terminal or each wireless terminal group discovered by the discovery procedure Transmitting a discovery report indicating an index value to the base station; With The bit size of the index value is smaller than the bit size of the identifier, Method.
  • the identifier includes at least one of Prose UE ID, ProSe Relay UE ID, ProSe Layer-2 Group ID, and Discovery Group ID. The method according to any one of appendices A5 to A7.
  • Appendix A9 A program for causing a computer to perform the method according to any one of appendices A5 to A8.
  • Appendix A11 The identifier is used in the discovery procedure.
  • the identifier includes at least one of Prose UE ID, ProSe Relay UE ID, ProSe Layer-2 Group ID, and Discovery Group ID.
  • the base station according to any one of appendices A10 to A12.
  • the at least one processor comprises: Configured to select a plurality of wireless terminals or a subset of a plurality of wireless terminal groups located in a cell of the base station; Configured to include the subset in the list; The base station according to any one of appendices A10 to A13.
  • the subset is one or more wireless terminals or wireless terminal groups that perform D2D transmission or are permitted to perform D2D transmission among the plurality of wireless terminals or the plurality of wireless terminal groups.
  • the identifier includes at least one of Prose UE ID, ProSe Relay UE ID, ProSe Layer-2 Group ID, and Discovery Group ID. The method according to any one of appendices A16 to A18.
  • Appendix A20 Selecting a plurality of wireless terminals or a subset of a plurality of wireless terminal groups located in a cell of the base station, and including the subset in the list; Further comprising The method according to any one of appendices A15 to A18.
  • the subset is one or more wireless terminals or wireless terminal groups that perform D2D transmission or are permitted to perform D2D transmission among the plurality of wireless terminals or the plurality of wireless terminal groups.
  • the method according to appendix A20 is one or more wireless terminals or wireless terminal groups that perform D2D transmission or are permitted to perform D2D transmission among the plurality of wireless terminals or the plurality of wireless terminal groups.
  • Appendix A22 A program for causing a computer to perform the method according to any one of appendices A16 to A21.
  • Appendix B1 A wireless terminal, Memory, At least one processor coupled to the memory; With The at least one processor performs received power measurements on each of a plurality of radio resources used for device-to-device (D2D) transmission or uplink transmission by one or more other wireless terminals. Configured and The at least one processor is configured to transmit a measurement report indicating a result of the measurement directly or via any wireless terminal to a base station; The plurality of radio resources are allocated to the one or more other radio terminals by the base station; The measurement report indicates a reception power level in each radio resource, or a radio resource in which reception power equal to or higher than a predetermined threshold is detected or not detected. Wireless terminal.
  • D2D device-to-device
  • Appendix B2 The measurement report is used by the base station to detect proximity between the wireless terminal and any of the one or more other wireless terminals; The wireless terminal according to Appendix B1.
  • Appendix B3 The plurality of radio resources are used for D2D transmission by the one or more other radio terminals; The wireless terminal according to Appendix B1 or B2.
  • Appendix B4 The plurality of radio resources are reserved by the base station to be used for uplink transmission and not for D2D transmission, and are allocated by the base station to the one or more other radio terminals; The wireless terminal according to Appendix B3.
  • the plurality of radio resources include a radio resource pool used for Physical Sidelink Control Channel (PSCCH) transmission by the one or more other radio terminals.
  • PSCCH Physical Sidelink Control Channel
  • the wireless terminal according to Appendix B3 or B4.
  • the plurality of radio resources includes a radio resource pool used for Physical Sidelink Shared Channel (PSSCH) transmission by the one or more other radio terminals.
  • PSSCH Physical Sidelink Shared Channel
  • the wireless terminal according to Appendix B3 or B4.
  • the plurality of radio resources includes a radio resource pool used for Physical Sidelink Discovery Channel (PSDCH) transmission by the one or more other radio terminals.
  • PSDCH Physical Sidelink Discovery Channel
  • the wireless terminal according to Appendix B3 or B4.
  • the at least one processor is configured to receive from the base station a measurement configuration specifying one or more transmission periods to perform the measurement and to perform the measurement according to the measurement configuration;
  • the wireless terminal according to any one of appendices B1 to B7.
  • the measurement report further indicates one or more transmission periods during which the measurement was made, The wireless terminal according to any one of appendices B1 to B8.
  • the transmission period is a subframe, a PSCCH period, or a PSDCH period.
  • Appendix B11 A method in a wireless terminal, Measuring received power on each of a plurality of radio resources used for device-to-device (D2D) transmission or uplink transmission by one or more other wireless terminals, and a result of said measurement Sending a measurement report indicating to the base station directly or via any wireless terminal, With The plurality of radio resources are allocated to the one or more other radio terminals by the base station; The measurement report indicates a reception power level in each radio resource, or a radio resource in which reception power equal to or higher than a predetermined threshold is detected or not detected.
  • Appendix B12 The measurement report is used by the base station to detect proximity between the wireless terminal and any of the one or more other wireless terminals; The method according to appendix B11.
  • Appendix B14 The plurality of radio resources are reserved by the base station to be used for uplink transmission and not for D2D transmission, and are allocated by the base station to the one or more other radio terminals; The method according to appendix B13.
  • the plurality of radio resources include a radio resource pool used for Physical Sidelink Control Channel (PSCCH) transmission by the one or more other radio terminals.
  • PSCCH Physical Sidelink Control Channel
  • Appendix B16 A program for causing a computer to perform the method according to any one of appendices B11 to B15.
  • D2D device-to-device
  • the at least one processor is configured to detect proximity between the first wireless terminal and any of the one or more other wireless terminals based on the measurement report; The base station described in Appendix B17.
  • the at least one processor is configured to allocate the plurality of radio resources to the one or more other radio terminals; The base station according to Appendix B17 or B18.
  • Appendix B20 The plurality of radio resources are used for D2D transmission by the one or more other radio terminals; The base station according to any one of appendices B17 to B19.
  • the at least one processor is configured to reserve the plurality of radio resources for use in uplink transmission and for use in D2D transmission; The base station described in Appendix B20.
  • the plurality of radio resources include a radio resource pool used for Physical Sidelink Control Channel (PSCCH) transmission by the one or more other radio terminals.
  • PSCCH Physical Sidelink Control Channel
  • the base station according to Appendix B20 or B21.
  • the plurality of radio resources includes a radio resource pool used for Physical Sidelink Shared Channel (PSSCH) transmission by the one or more other radio terminals.
  • PSSCH Physical Sidelink Shared Channel
  • the plurality of radio resources includes a radio resource pool used for Physical Sidelink Discovery Channel (PSDCH) transmission by the one or more other radio terminals.
  • PSDCH Physical Sidelink Discovery Channel
  • the base station according to Appendix B20 or B21.
  • the at least one processor is configured to transmit to the first wireless terminal a measurement configuration specifying one or more transmission periods to perform the measurement;
  • the base station according to any one of appendices B17 to B24.
  • the measurement report further indicates one or more transmission periods during which the measurement was made, The base station according to any one of appendices B17 to B25.
  • the transmission period is a subframe, a PSCCH period, or a PSDCH period.
  • the base station according to Appendix B25 or B26.
  • Appendix B28 A method in a base station, Receiving a measurement report from the first wireless terminal directly or via any wireless terminal;
  • the measurement report includes the first radio of received power on each of a plurality of radio resources used for device-to-device (D2D) transmission or uplink transmission by one or more other radio terminals. Shows the results of the measurement by the device,
  • the plurality of radio resources are allocated to the one or more other radio terminals by the base station;
  • the measurement report indicates a reception power level in each radio resource, or a radio resource in which reception power equal to or higher than a predetermined threshold is detected or not detected.
  • Appendix B29 Detecting proximity between the first wireless terminal and any of the one or more other wireless terminals based on the measurement report; The method according to appendix B28.
  • Appendix B30 Further comprising allocating the plurality of radio resources to the one or more other radio terminals; The method according to appendix B28 or B29.
  • Appendix B31 The plurality of radio resources are used for D2D transmission by the one or more other radio terminals; The method according to any one of appendices B28 to B30.
  • Appendix B32 Further comprising reserving the plurality of radio resources for use in uplink transmission and for use in D2D transmission; The method according to appendix B31.
  • the plurality of radio resources include a radio resource pool used for Physical Sidelink Control Channel (PSCCH) transmission by the one or more other radio terminals.
  • PSCCH Physical Sidelink Control Channel
  • Appendix B34 A program for causing a computer to perform the method according to any one of appendices B28 to B33.
  • At least one processor coupled to the memory; With The at least one processor comprises: Configured to determine one or more neighboring D2D communication pairs present in the vicinity of the first device-to-device (D2D) communication pair; In consideration of the influence of D2D transmission performed by the one or more neighboring D2D communication pairs, the transmission rate of the first D2D transmission performed by the first D2D communication pair is estimated. Processing equipment.
  • D2D device-to-device
  • the at least one processor is configured to estimate the transmission rate using a weight value that decreases with an increase in the number of the one or more neighboring D2D communication pairs;
  • the processing apparatus according to Appendix C1.
  • the at least one processor is configured to calculate the transmission rate by multiplying a transmission rate estimate based on a signal to interference plus noise ratio (SINR) of the first D2D transmission by the weight value.
  • SINR signal to interference plus noise ratio
  • Appendix C4 The weight value is inversely proportional to the number of the one or more neighboring D2D communication pairs, The processing apparatus according to Appendix C2 or C3.
  • the at least one processor comprises: Identifying one or more neighboring D2D communication pairs from a plurality of D2D communication pairs existing in the coverage area of the base station; The transmission rate is estimated using a weight value that decreases as the usage rate of D2D radio resources by the one or more neighboring D2D communication pairs increases.
  • the processing apparatus according to Appendix C1.
  • the at least one processor is configured to calculate the transmission rate by multiplying a transmission rate estimate based on a signal to interference plus noise ratio (SINR) of the first D2D transmission by the weight value.
  • SINR signal to interference plus noise ratio
  • the at least one processor is configured to estimate the transmission rate of the first D2D transmission further considering a proximity relationship between the one or more neighboring D2D communication pairs;
  • the processing apparatus according to any one of appendices C1 to C6.
  • the at least one processor comprises: Configured to predict the occurrence of future D2D transmissions by the one or more neighboring D2D communication pairs based on a history of allocation of D2D radio resources to the one or more neighboring D2D communication pairs; Configured to estimate the transmission rate of the first D2D transmission in view of D2D radio resources used by the predicted future D2D transmission;
  • the processing apparatus according to any one of appendices C1 to C8.
  • the processor is located in a base station configured to allocate D2D radio resources to the first D2D communication pair and the one or more neighboring D2D communication pairs;
  • the processing apparatus according to any one of appendices C1 to C9.
  • a transmission rate estimation method comprising: estimating a transmission rate of a first D2D transmission performed by the first D2D communication pair in consideration of
  • the estimating includes estimating the transmission rate using a weight value that decreases with an increase in the number of the one or more neighboring D2D communication pairs.
  • the estimating includes calculating the transmission rate by multiplying a transmission rate estimate based on a signal to interference plus noise ratio (SINR) of the first D2D transmission by the weight value.
  • SINR signal to interference plus noise ratio
  • the weight value is inversely proportional to the number of the one or more neighboring D2D communication pairs, The method according to Appendix C12 or C13.
  • the determining includes identifying the one or more neighboring D2D communication pairs from a plurality of D2D communication pairs present in a coverage area of a base station;
  • the estimating includes estimating the transmission rate using a weight value that decreases as the usage rate of D2D radio resources by the one or more neighboring D2D communication pairs increases.
  • the estimating includes calculating the transmission rate by multiplying a transmission rate estimate based on a signal to interference plus noise ratio (SINR) of the first D2D transmission by the weight value.
  • SINR signal to interference plus noise ratio
  • the estimating includes estimating the transmission rate of the first D2D transmission further considering a proximity relationship between the one or more neighboring D2D communication pairs; The method according to any one of appendices C11 to C16.
  • the estimation is performed when it is determined that there is no proximity relationship between the second and third D2D communication pairs included in the one or more neighboring D2D communication pairs. Including considering only one of the D2D communication pairs of the first D2D transmission to estimate the transmission rate of the first D2D transmission; The method according to appendix C17.
  • (Appendix C19) Predicting the occurrence of future D2D transmissions by the one or more neighboring D2D communication pairs based on the history of assignment of D2D radio resources to the one or more neighboring D2D communication pairs;
  • the estimating includes estimating the transmission rate of the first D2D transmission in consideration of D2D radio resources used by the predicted future D2D transmission;
  • the method according to any one of appendices C11 to C18.
  • Appendix C20 A program for causing a computer to perform the transmission rate estimation method according to any one of appendices C11 to C19.
  • RF radio frequency

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

Abstract

La présente invention concerne un appareil de traitement (3) qui est conçu afin de déterminer au moins une paire de communication D2D de proximité (2B, 2C) existante à côté d'une première paire de communication D2D (2A). L'appareil de traitement (3) est en outre conçu afin d'estimer la vitesse de transmission d'une première transmission D2D (101A) réalisée par la première paire de communication D2D (2A) en tenant compte de l'influence de la transmission D2D (101B, 101C) réalisée par lesdites paires de communication D2D de proximité (2B, 2C). De cette manière, une amélioration de l'estimation de la vitesse de transmission des transmissions de dispositif à dispositif (D2D) peut être obtenue, par exemple.
PCT/JP2017/004819 2016-04-28 2017-02-09 Appareil et procédé destinés à la communication sans fil WO2017187713A1 (fr)

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JP2022508844A (ja) * 2018-10-29 2022-01-19 オッポ広東移動通信有限公司 サイドリンクにおける伝送モードの決定方法、端末装置及びネットワーク装置
WO2022128090A1 (fr) * 2020-12-16 2022-06-23 Telefonaktiebolaget Lm Ericsson (Publ) Détermination du fait que des dispositifs sans fil satisfont ou non à un critère de localisation

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JP2022508844A (ja) * 2018-10-29 2022-01-19 オッポ広東移動通信有限公司 サイドリンクにおける伝送モードの決定方法、端末装置及びネットワーク装置
JP7341246B2 (ja) 2018-10-29 2023-09-08 オッポ広東移動通信有限公司 サイドリンクにおける伝送モードの決定方法、端末装置及びネットワーク装置
WO2022128090A1 (fr) * 2020-12-16 2022-06-23 Telefonaktiebolaget Lm Ericsson (Publ) Détermination du fait que des dispositifs sans fil satisfont ou non à un critère de localisation

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