JP2017175348A - Apparatus and method for resource scheduling relating to device-to-device communication - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contribute to maintenance of fairness of uplink radio resource allocation in a radio communication network on which a radio terminal is allowed to perform uplink transmission by utilizing one or more relay terminals.SOLUTION: An apparatus (3) discriminates a first group (152) including one or more uplink transmissions due to one or more radio terminals (1B and 2C) relating to transfer of data transmitted from the first radio terminals (1B) from a second group (153) including one or more uplink transmissions due to one or more radio terminals (4) relating to transfer of data transmitted from the second radio terminals (4). Further, the apparatus (3) determines whether to give priority to the first group (152) over the second group (153) in the case of uplink radio resource allocation within a transmission period, based on the number of uplink transmissions of each of the groups or the number of radio terminals in each of the groups.SELECTED DRAWING: Figure 6

Description

  The present disclosure relates to terminal-to-terminal direct communication (device-to-device (D2D) communication), and particularly to uplink resource scheduling suitable for 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 and direct discovery. In some implementations, 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 (ProSe) defined in 3GPP Release 12 is an example of D2D communication. ProSe Direct Discovery is a wireless terminal capable of executing ProSe (ProSe-enabled User Equipment (UE)) and other ProSe-enabled UEs, and wireless communication technology (for example, Evolved Universal Terrestrial Radio Access (E -UTRA) technology) is used only for discovery. ProSe direct discovery may be performed by more than two ProSe-enabled UEs.

  ProSe direct communication allows the establishment of a communication path between two or more ProSe-enabled UEs present in the direct communication range after the ProSe direct discovery procedure. In other words, ProSe direct communication allows ProSe-enabled UEs to communicate with other ProSe-enabled UEs without going through a Public Land Mobile Network (PLMN) that includes a base station (eNodeB (eNB)). Allows to communicate directly with. ProSe direct communication may be performed using the same wireless communication technology (E-UTRA technology) as that used to access the base station (eNB), or wireless local area network (WLAN) wireless technology (ie, IEEE 802.11 radio technology).

  In 3GPP Release 12, a wireless link between wireless terminals 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.

  In 3GPP Release 12 ProSe, radio resources for side link transmission are allocated to UEs by a radio access network (e.g., Evolved Universal Terrestrial Radio Access Network (E-UTRAN)). The UE that is permitted side link communication by the ProSe function performs ProSe direct discovery or ProSe direct communication using radio resources allocated by the radio access network node (e.g., eNB (eNB)).

  For ProSe direct communication, two resource allocation modes, namely scheduled resource allocation and autonomous resource selection for which scheduled resource allocation and autonomous resource selection are specified, are called “sidelink transmission mode 1” and “sidelink transmission mode 2”, respectively. .

  In scheduled resource allocation of ProSe direct communication, when a UE desires side link transmission, the UE requests radio resource allocation for side link transmission from the eNB, and the eNB allocates 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 is allocated with an uplink grant (UL grant). The Sidelink Buffer Status Report (Sidelink BSR) is transmitted to the eNB in the received UL data transmission resource. eNB determines the side link transmission resource allocated to UE based on Sidelink BSR, and transmits a side link grant (SL grant) to UE.

  SL grant is defined as Downlink Control Information (DCI) format 5. 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 for transmitting a side link data channel (ie, Physical Sidelink Shared Channel (PSSCH)) for data transmission on the side link, that is, a set of subcarriers (resource blocks), Used to determine. Time resource pattern index is used to determine a time resource for transmitting PSSCH, that is, a set of subframes. Strictly speaking, the 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 in the frequency domain. A resource unit defined by subcarriers. In the case of the normal cyclic prefix, 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 terminal) determines the PSCCH resource and the PSSCH resource according to the SL grant.

  On the other hand, in autonomous resource selection of ProSe direct communication, the UE autonomously selects a resource for side link control (PSCCH) and data (PSSCH) from the resource pool set by the eNB. In the System Information Block (SIB) 18, the eNB may assign a resource pool to be used for autonomous resource selection to the UE. Note that the eNB may allocate a resource pool to be used for autonomous resource selection by dedicated RRC signaling to a Radio Resource Control (RRC) _CONNECTED UE. This resource pool may also be available when the UE is RRC_IDLE.

  When performing direct transmission on the side link, a UE (D2D transmitting UE) (hereinafter referred to as a transmitting terminal) on the transmission side uses a radio resource area (resource pool) for the side link control channel (ie, PSCCH). Then, scheduling assignment information is transmitted. 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). In the case of the scheduled resource allocation described above, the Resource block assignment and hopping allocation and time resource pattern index indicated by the Scheduling Assignment (SCI format 0) are the resource block assignment and hopping allocation indicated by the SL grant (DCI format 5) received from the eNB. Follow time resource pattern index.

  The transmitting terminal transmits data on the PSSCH using radio resources according to the scheduling allocation information. A receiving side UE (D2D receiving UE) (hereinafter referred to as a receiving terminal) receives scheduling assignment information from a transmitting terminal on the PSCCH, and receives data on the PSSCH according to the scheduling assignment information. Here, the term “transmission terminal” is an expression that focuses on the transmission operation of the wireless terminal, and does not mean a wireless terminal dedicated to transmission. Similarly, the term “receiving terminal” is an expression that focuses on the receiving operation of the wireless terminal, and does not mean a terminal dedicated to reception. That is, the transmitting terminal can also perform a receiving operation, and the receiving terminal can also perform a transmitting operation.

  Furthermore, 3GPP Release 12 defines a partial coverage scenario where one UE is outside the network coverage and the other UE is within the network coverage. In a partial coverage scenario, a UE that is out of coverage is called a remote UE or a sidelink remote UE, and a UE that relays within the coverage and between the remote UE and the network is called a ProSe UE-to-Network Relay or a sidelink relay UE. ProSe UE-to-Network Relay relays traffic (downlink and uplink) between the remote UE and the network (E-UTRA network (E-UTRAN) and EPC).

  More specifically, a ProSe UE-to-Network Relay attaches to a network as a UE, establishes a PDN connection to communicate with a ProSe function entity or other packet data network (PDN), and performs ProSe direct communication. Communicate with the ProSe function entity to get started. ProSe UE-to-Network Relay also performs discovery procedures with remote UEs, communicates with remote UEs at the UE-to-UE direct interface (eg, side link or PC5 interface), and between the remote UE and the network To relay traffic (downlink and uplink). When Internet Protocol version 4 (IPv4) is used, ProSe UE-to-Network Relay operates as Dynamic Host Configuration Protocol Version 4 (DHCPv4) Server and Network Address Translation (NAT). When IPv6 is used, ProSe UE-to-Network Relay operates as a stateless DHCPv6 Relay Agent.

  Further, 3GPP Release 13 includes an extension of ProSe (see, for example, Non-Patent Documents 1-3). Non-Patent Document 1 defines the start procedure of Direct communication via ProSe UE-to-Network Relay and the start procedure of One-to-one ProSe Direct Communication (sections 5.4.4 and 5.4 of Non-Patent Document 1). See Non-Patent Document 2. Non-Patent Document 2 defines a sidelink-related RRC procedure including one to one sidelink communication, sidelink relay operation, and sidelink remote operation (see Section 5 of Non-Patent Document 2). Reference 3 specifies a Medium Access Control (MAC) function to support one-to-one sidelink communication (or unicast sidelink communication) including communication between a sidelink remote UE and a sidelink relay UE (non- (See Sections 5.4.4, 5.14, 6.1.3.1a, and 6.2.1 of Patent Document 3).

  In this specification, a wireless terminal having D2D communication capability and relay capability such as ProSe UE-to-Network Relay (sidelink relay UE) is referred to as a “relay terminal” or “relay UE”. A wireless terminal that receives a relay service by the relay UE is referred to as a “remote terminal” or a “remote UE”. A remote terminal can also be referred to as a relayed terminal.

3GPP TS 23.303 V13.2.0 (2015-12), “3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Proximity-based services (ProSe); Stage 2 (Release 13)”, December 2015 3GPP TS 36.331 V13.0.0 (2015-12), “3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification (Release 13)” , December 2015 3GPP TS 36.321 V13.0.0 (2015-12), “3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Access Control (MAC) protocol specification (Release 13)”, December 2015

  The inventors are suitable for cases where a remote UE is connected to one or more relay UEs and data originated by the remote UE is transferred to the base station via multiple uplink paths. We studied uplink scheduling. Here, the plurality of uplink paths may include two or more uplink transmissions from two or more relay UEs to the base station. Alternatively, the plurality of uplink paths may include at least one uplink transmission from at least one relay UE to the base station and uplink transmission from the remote UE itself to the base station. That is, the remote UE may be located in the cellular coverage (cell) of the base station and perform cellular communication with the base station.

  In uplink scheduling, the base station schedules a plurality of uplink transmissions of the plurality of UEs in response to a scheduling request and a buffer status report (Buffer Status Report (BSR)) from the plurality of UEs. In general, the base station calculates metric values based on priority, fairness, communication efficiency, etc. for each UE or each uplink transmission, and compares the metric values of multiple UEs (or uplink transmissions) Then, radio resources in the current transmission period (eg, LTE subframe) are allocated to one or more UEs. Radio resources within one transmission period include, for example, a frequency resource (e.g., LTE resource block) and a transmission power resource. In some implementations, some UEs have a higher priority than other UEs, and that priority is considered in uplink scheduling.

  However, in the case where there are multiple uplink transmissions related to the transfer of data originating from one remote UE, the actual uplink performance (eg, bandwidth, data rate, or throughput) of the remote UE is It should be noted that it depends on the sum of the performance of these multiple uplink transmissions. Typical uplink scheduling does not distinguish multiple uplink transmissions related to the transfer of data originating from one remote UE from other uplink transmissions. Thus, general uplink scheduling cannot specifically handle these multiple uplink transmissions.

  For example, in general uplink scheduling, it is not sufficiently guaranteed that a plurality of uplink transmissions related to data transmission of one remote UE are scheduled in the same transmission period (e.g., subframe). It may be preferred that these multiple uplink transmissions are scheduled in the same transmission period and performed as simultaneously as possible. When many frequency resources (resource blocks) within one transmission period are allocated to one uplink transmission (one UE), the transmission power per frequency resource (resource block) decreases, and therefore the frequency resource (resource block) The per bit rate (or throughput) is reduced. On the other hand, if multiple uplink transmissions by multiple UEs are scheduled in the same transmission period, the number of frequency resources (resource blocks) allocated to each uplink transmission is relatively reduced, and frequency resources ( The transmission power per resource block) increases, and therefore the bit rate (or throughput) per frequency resource (resource block) can be increased.

  Furthermore, additional consideration may be required if a wireless communication scheme that provides continuity (adjacency) constraints on radio resource allocation is used for the uplink. For example, in SC-FDMA used for LTE uplink, all resource blocks (RBs) allocated to each UE must be adjacent to each other. Such a continuity (adjacency) constraint complicates uplink scheduling and leads to a decrease in resource usage efficiency due to fragmentation of uplink radio resources.

  In particular, when there are a plurality of groups having different numbers of uplink transmissions (or the number of UEs), it is difficult to maintain fairness between UE groups in uplink radio resource allocation due to resource fragmentation. There is a problem that there is. Here, each UE group consists of one or more UEs that perform one or more uplink transmissions related to one UE (remote UE or normal UE). Temporarily, the scheduler allocates radio resources in the transmission period before the second UE group having a relatively small number of uplink transmissions to the first UE group having a relatively large number of uplink transmissions. Then, the second UE group may not be able to receive sufficient resource allocation for resource fragmentation.

  Accordingly, one of the objectives that the embodiments disclosed herein attempt to achieve is wireless communication in which one wireless terminal is allowed to perform uplink transmission using one or more relay terminals. An object is to provide an apparatus, a method, and a program that contribute to maintaining fairness of uplink radio resource allocation in a network. It should be noted that this object is only one of the objects that the embodiments disclosed herein intend to achieve. Other objects or problems and novel features will become apparent from the description of the present specification or the accompanying drawings.

  In a first aspect, an apparatus for uplink scheduling includes a memory and at least one processor coupled to the memory. The at least one processor transmits a first group including one or more uplink transmissions by one or more wireless terminals related to the transfer of data originating from the first wireless terminal to a second wireless It is configured to distinguish from a second group comprising one or more uplink transmissions by one or more wireless terminals involved in the transfer of data originating from the terminals. Further, the at least one processor determines whether the first group should be prioritized over the second group when allocating uplink radio resources in a transmission period, and determines the number of uplink transmissions for each group. Alternatively, the determination is made based at least in part on the number of wireless terminals in each group.

  In a second aspect, a method for uplink scheduling includes: (a) one or more uplink transmissions by one or more wireless terminals related to the transfer of data originating from the first wireless terminal. Distinguishing from a second group comprising one or more uplink transmissions by one or more wireless terminals related to the transfer of data originating from the second wireless terminal; And (b) whether the first group should be prioritized over the second group when allocating uplink radio resources within a transmission period, the number of uplink transmissions in each group or the radios in each group Determining based at least in part on the number of terminals.

  In the third aspect, the program includes a group of instructions (software code) for causing the computer to perform the method according to the second aspect described above when read by the computer.

  According to the above-described aspect, to maintain fairness of uplink radio resource allocation in a radio communication network in which one radio terminal is allowed to perform uplink transmission using one or more relay terminals. Contributing devices, methods, and programs can be provided.

It is a figure which shows the structural example of the radio | wireless communication network which concerns on embodiment. It is a block diagram which shows the structural example of the uplink scheduler mounted in the base station which concerns on embodiment. It is a flowchart which shows an example of the uplink scheduling procedure by the base station which concerns on embodiment. It is a flowchart which shows an example of the uplink scheduling procedure by the base station which concerns on embodiment. It is a flowchart which shows an example of the uplink scheduling procedure by the base station which concerns on embodiment. It is a figure for demonstrating the outline | summary of the uplink scheduling which concerns on 1st Embodiment. It is a figure which shows the comparative example of uplink scheduling. It is a figure which shows an example of the uplink scheduling which concerns on embodiment. It is a sequence diagram which shows an example of UE group detection which concerns on embodiment. It is a sequence diagram which shows an example of UE group detection which concerns on embodiment. It is a sequence diagram which shows an example of UE group detection which concerns on embodiment. It is a block diagram which shows the structural example of the radio | wireless terminal which concerns on embodiment. It is a block diagram which shows the structural example of the base station which concerns on embodiment.

  Hereinafter, specific embodiments will be described in detail with reference to the drawings. In each drawing, the same or corresponding elements are denoted by the same reference numerals, and redundant description is omitted as necessary for clarification of the description.

  A plurality of embodiments described below can be implemented independently or can be implemented in combination as appropriate. 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.

  Several embodiments shown below are described mainly with respect to improvements of 3GPP ProSe. However, these embodiments are not limited to LTE-Advanced and its improvements, and may be applied to D2D communication in other mobile communication networks or systems.

<First Embodiment>
FIG. 1 shows a configuration example of a wireless communication network according to the present embodiment. Specifically, FIG. 1 illustrates an example of UE-to-Network Relay (sidelink relay UE), and illustrates remote UEs 1A and 1B, relays UE2A, 2B, and 2C, and UE4. In the following description, when a matter common to a plurality of remote UEs including the remote UE 1A is described, the reference numeral 1 is used to simply refer to “remote UE 1”. Similarly, when a matter common to a plurality of relay UEs including relays UE2A and 2B is described, “relay UE2” is simply referred to using reference numeral 2.

  The remote UE1 has at least one radio transceiver and is configured to perform D2D communication with one or more relay UE2 over one or more D2D links (e.g., D2D link 101). As already explained, in 3GPP, 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. Similarly, ProSe Direct Discovery is direct discovery using side link transmission and is also called Sidelink Direct Discovery. Further, the remote UE 1 performs cellular communication in the cellular link (eg, cellular link 120) including the uplink and the downlink with the base station 3 in the cellular coverage (cell) provided by the base station (eNB) 3. It is configured.

  The relay UE2 has at least one radio transceiver, and performs cellular communication in a cellular link (eg, cellular link 121) including an uplink and a downlink with the base station 3 in the cellular coverage, and a D2D link (eg, It is configured to perform D2D communication (eg, ProSe direct discovery and ProSe direct communication) with the remote UE 1 on the D2D link 101).

  UE4 is not connected to remote UE1 or relay UE2, and performs only its own uplink transmission.

  The base station 3 is an entity arranged in a radio access network (ie, E-UTRAN), provides cellular coverage including one or a plurality of cells, and uses cellular communication technology (eg, E-UTRA technology). Can communicate with the relays UE2 and UE4 in the cellular link (eg, cellular link 121). Furthermore, the base station 3 is configured to perform cellular communication with the remote UE 1 that is in the cellular coverage.

  FIG. 1 shows three transmission configurations with different numbers of uplink transmissions. That is, the remote UE 1A is connected to the two relays UE 2A and 2B. Therefore, data transmitted from the remote UE 1A can be transmitted to the base station 3 via three uplink transmissions, that is, uplink transmissions of the remote UE 1A, the relay UE 2A, and the relay UE 2B. The remote UE 1B is connected to one relay UE 2C. Therefore, data transmitted from the remote UE 1B can be transmitted to the base station 3 via two uplink transmissions, that is, uplink transmissions of the remote UE 1B and the relay UE 2C. On the other hand, UE4 is not connected to remote UE1 or relay UE2, and performs only its own uplink transmission. Therefore, data transmitted from the UE 4 can be transmitted to the base station 3 via one uplink transmission of the UE 4 itself.

  That is, the number of substantial uplink transmissions (uplink paths) of the remote UE 1A, the remote UE 1B, and the UE 4 illustrated in FIG. 1 is three, two, and one, respectively. In such a situation where UEs with different numbers of substantial uplink transmissions available are mixed, it is preferable that special consideration is made in uplink scheduling.

  Note that the two relay configurations related to the remote UEs 1A and 1B shown in FIG. 1 are merely examples, and various relay configurations can be used. For example, in a certain relay form, one remote UE1 may be connected to one relay UE2, and the remote UE1 may use only one uplink transmission, that is, only the uplink transmission of the relay UE2. For example, in one relay configuration, two remote UE1s may be connected to one relay UE2, and each relay UE2 may utilize two uplink transmissions, namely the uplink transmission of the relay UE2 and its own uplink transmission. .

  The base station 3 according to this embodiment distinguishes a plurality of UE groups and performs uplink scheduling between the UE groups. Each UE group includes one or more UEs related to transmission of data transmitted from one UE (remote UE1 or UE4). For example, the example of FIG. 1 illustrates three UE groups 151, 152, and 153. The UE group 151 includes a remote UE 1A, a relay UE 2A, and a relay UE 2B related to transmission of data transmitted from the remote UE 1. The UE group 152 includes a remote UE 1B and a relay UE 2C related to transmission of data transmitted from the remote UE 1B. The UE group 153 includes UE4 related to transmission of data transmitted from the UE4 itself.

  Next, details of uplink scheduling performed by the base station 3 will be described below. FIG. 2 shows a configuration example of the uplink scheduler implemented in the base station 3. The uplink scheduler 201 shown in FIG. 2 schedules uplink transmissions of these UEs based on BSRs from multiple UEs. Specifically, the uplink scheduler 201 determines allocation of a plurality of frequency resources (i.e., resource blocks) to the plurality of UEs or a subset thereof in each subframe (transmission period). Note that the radio resource in the transmission period may be another radio resource different from the frequency resource, or may be a combination of the frequency resource and another radio resource. That is, the radio resources in the transmission period depend on the radio communication technology employed for the uplink. For example, the radio resources in the transmission period may include spreading code resources or transmission power resources or both.

  The uplink scheduler 201 considers channel quality information for uplink scheduling. The channel quality information indicates channel quality over a plurality of resource blocks between each UE and the base station 3. Uplink scheduler 201 may consider other information and constraints for uplink scheduling. For example, the uplink scheduler 201 may determine the maximum uplink transmission power of each UE, the quality of service (QoS) requirements (eg, Guaranteed Bit Rate (GBR)) of each UE, the transmission rate history of each UE, or each UE. Priority, or any combination thereof may be considered.

  Further, the uplink scheduler 201 considers grouping information for uplink scheduling. The grouping information indicates an association between one data origination UE (i.e., remote UE1 or UE4) and one or more relay UE2 related to data transmission of the data origination UE. Alternatively, the grouping information indicates a plurality of uplink transmission associations related to data originated from one UE. The plurality of uplink transmissions are a plurality of transmissions from a plurality of UEs including at least one relay UE2 to the base station 3. Accordingly, the grouping information can also be called association information. For example, the grouping information includes information for specifying one or more relay UE2 to which each remote UE1 is connected.

  In some implementations, the grouping information may associate each remote UE1 identifier with one or more relay UE2 identifiers to which each remote UE1 is connected. Alternatively, the grouping information may associate the identifier of each relay UE2 with the identifier of one or more remote UE1 connected to each relay UE2. Instead of this, the grouping information may associate the identifier of the UE group with the identifiers of a plurality of UEs belonging to the UE group.

  In some implementations, the uplink scheduler 201 may include a time domain scheduler 202 and a frequency domain scheduler 203, as shown in FIG. The time domain scheduler 202 prioritizes a plurality of UEs and selects the UEs scheduled in each transmission period (i.e., subframe). The frequency domain scheduler 203 determines an optimal mapping between resource blocks in each transmission period (i.e., subframe) and UEs selected by the time domain scheduler 202.

  FIG. 3 shows an example (processing 300) of an uplink scheduling procedure by the base station 3 according to the present embodiment. In step 301, the base station 3 (uplink scheduler 201) distinguishes a plurality of UE groups. Each UE group consists of one or more UEs that perform one or more uplink transmissions related to one UE (remote UE1 or UE4). The plurality of UE groups include, for example, UE groups 151 to 153 illustrated in FIG. 1 and having different numbers of uplink transmissions.

  In step 302, the base station 3 (uplink scheduler 201) determines which of a plurality of UE groups should be prioritized when assigning uplink radio resources for the current transmission period (ie, subframe). Determine based at least in part on the number of uplink transmissions for each UE group. For example, when the base station 3 schedules two UE groups in one transmission period, the base station 3 has priority over one of the two UE groups over the other with less uplink transmission or fewer radio terminals. Thus, uplink radio resources in the transmission period are allocated.

  The base station 3 may directly consider the priority level (priority metric) based on the number of uplink transmissions (uplink paths) of each UE group. Specifically, a UE group with a small number of uplink transmissions is assigned a higher priority level than a UE group with a large number of uplink transmissions. That is, the priority level is defined to change inversely with the number of UEs in the UE group or the number of uplink transmissions.

  In some implementations, the base station 3 (uplink scheduler 201) determines whether a specific UE group should be scheduled for a specific transmission period in preference to other UE groups. You may decide based on at least. In other words, the base station 3 may consider the priority level in time domain scheduling for selecting one or more UE groups scheduled in the current transmission period (ie, subframe). . Thereafter, the base station 3 may allocate radio resources in the current transmission period in order from the UE group having the higher priority level, that is, the number of UEs or the number of uplink transmissions.

  Alternatively, in some implementations, the base station 3 (uplink scheduler 201) may select a subset of the multiple UE groups that are scheduled for the current transmission period according to other predetermined policies. . The subset includes one or more UE groups. In other words, in time domain scheduling to select one or more UE groups scheduled within the current transmission period (ie, subframe), the base station 3 determines the number of UEs in each UE group or up. A priority level based on the number of link transmissions need not necessarily be considered. After that, the base station 3 allocates radio resources (ie, resource blocks) in the current transmission period in order from the UE group having the higher current priority level, that is, the number of UEs or the number of uplink transmissions. Also good. That is, in frequency domain scheduling for allocating radio resources (ie, resource blocks) in one transmission period (ie, subframe) to a plurality of UE groups, the base station 3 performs uplink transmission of each UE group. A priority level based on a number may be considered.

  The predetermined policy for time domain scheduling may at least include considering fairness of radio resource allocation among multiple UE groups. In order to consider the fairness of radio resource allocation, proportional fair (PF) scheduling may be used. That is, the base station 3 (uplink scheduler 201 or time domain scheduler 202) calculates the instantaneous throughput of each UE group in the current subframe, calculates the past average throughput of each UE group, A PF metric for each UE group may be calculated based on both the instantaneous throughput of the group and the past average throughput. Further, the base station 3 may select one or more UE groups to be scheduled in the current subframe by comparing the calculated PF metrics of multiple UE groups. Note that the instantaneous throughput of each UE group may be the sum of the instantaneous throughputs of one or more UEs belonging to the UE group. The past average throughput of each UE group may be the sum of the past average throughputs of one or more UEs belonging to the UE group.

  FIG. 4 shows an example of the detailed procedure of uplink scheduling performed in step 302 of FIG. 3 (process 400). In the example of FIG. 4, the base station 3 considers a priority level based on the number of uplink transmissions of each UE group in time domain scheduling. That is, in step 401, the base station 3 (uplink scheduler 201 or time domain scheduler 202) is based at least on a priority level (priority metric) that varies inversely with the number of uplink transmissions for each UE group. Select the UE group scheduled for the current transmission period.

  In step 401, other scheduling metrics may be further used. For example, the base station 3 uses proportional fair (PF) scheduling in order to consider the fairness of radio resource allocation. That is, the base station 3 (uplink scheduler 201 or time domain scheduler 202) calculates the instantaneous throughput of each UE group in the current subframe, calculates the past average throughput of each UE group, Calculate the PF metric for each UE group based on both the instantaneous throughput and the past average throughput of the group. Furthermore, the base station 3 compares the calculated PF metrics of a plurality of UE groups. Then, for example, among the one or more UE groups whose PF metric exceeds the reference value, the base station 3 determines the UE group having the highest priority level (priority metric) based on the number of uplink transmissions as the current UE group. Select to be scheduled for the sending period. Instead, the base station 3 determines the above priority level (priority) based on the number of uplink transmissions among one or more UE groups having a PF metric within a predetermined range from the calculated maximum value of the PF metric. The UE group with the highest degree metric) may be selected to be scheduled for the current transmission period.

  In step 402, the base station 3 (uplink scheduler 201 or frequency domain scheduler 203) maximizes the sum of the bandwidth or throughput of one or more uplink transmissions in the UE group selected in step 401. As such, radio resource allocation within the current transmission period is determined. In some implementations, the uplink scheduler 201 (frequency domain scheduler 203) uses existing capacity-maximizing resource allocation. That is, the uplink scheduler 201 maximizes the sum of capacity-related metrics of all UEs in the UE group under physical (eg, transmission power) and QoS related constraints. In addition, resource block allocation to each UE in the UE group may be determined. The capacity-related metric is, for example, the throughput or transmission rate of each UE.

  In step 403, the base station 3 (uplink scheduler 201) determines whether there are more radio resources in the current transmission period. If there are surplus radio resources, the base station 3 repeats the processing of steps 401 to 402.

  FIG. 5 shows another example of the detailed procedure of uplink scheduling performed in step 302 of FIG. 3 (process 500). In the example of FIG. 5, the base station 3 considers a priority level based on the number of uplink transmissions of each UE group in frequency domain scheduling. That is, in step 501, the base station 3 (uplink scheduler 201 or time domain scheduler 202) selects one or more UE groups scheduled in the current transmission period according to a predetermined policy. The predetermined policy may include at least considering the fairness of radio resource allocation among a plurality of UE groups as described above.

  In step 502, the base station 3 (uplink scheduler 201 or frequency domain scheduler 203) performs uplink radio resources (ie, in the current transmission period) for the one or more UE groups selected in step 501. , Resource block) is determined based at least on the above-described priority metric that varies inversely with the number of uplink transmissions for each UE group.

  In step 503, the base station 3 (uplink scheduler 201 or frequency domain scheduler 203) sends the uplink in the current transmission period to one or more uplink transmissions in the UE group selected according to priority. Allocate radio resources. In step 503, as in step 402, the base station 3 determines the current transmission period to maximize the sum of the bandwidth or throughput of one or more uplink transmissions in the UE group selected according to the priority. The radio resource allocation within may be determined.

  Hereinafter, a specific example of radio resource allocation based on uplink scheduling according to the present embodiment will be described in comparison with a comparative example. FIG. 6 shows a network model referred to in the following description. The network in FIG. 6 includes the remote UE 1B, relay UE 2C, UE 4 and base station 3 shown in FIG. In the following description, for convenience, UE4 is referred to as UE-A, remote UE1B as UE-B, and relay UE2C as UE-C. A UE group 153 including only one UE-A has only one uplink transmission. On the other hand, the UE group 152 including UE-A and UE-B has only two uplink transmissions.

  FIG. 7A shows a comparative example. In the example of FIG. 7A, the priority level (priority metric) based on the number of uplink transmissions of each UE group is considered in the allocation of radio resources (ie, resource blocks) within one transmission period (ie, subframe). It has not been. As a result, in the first round of scheduling, radio resources are allocated to UE-B (remote UE1B) and UE-C (relay UE2C). Next, in the second round of scheduling, radio resources are allocated to UE-A (UE4). However, if a radio communication scheme that causes continuity (adjacency) constraints on radio resource allocation, eg SC-FDMA, is used for the uplink, UE-A can no longer receive only two RB allocations. Such radio resource allocation causes a failure of fairness due to a difference in the number of uplink transmissions (uplink paths) of a plurality of UE groups. Alternatively, such radio resource allocation causes a reduction in resource utilization efficiency due to resource fragmentation.

  On the other hand, FIG. 7B shows an example of radio resource allocation obtained by uplink scheduling according to the present embodiment. In the example of FIG. 5B, the priority level (priority metric) based on the number of uplink transmissions of each UE group is considered in the allocation of radio resources (ie, resource blocks) within one transmission period (ie, subframe). Is done. As a result, in the first round of scheduling, UE-A (UE4 with a relatively small number of uplink transmissions is allocated radio resources. Next, in the second round of scheduling, UE-B (remote UE1B) and UE -C (relay UE 2C) is assigned radio resources, which can contribute to maintaining fairness among a plurality of UE groups with different uplink transmission numbers, or such radio resource assignment is Therefore, it is possible to suppress a decrease in resource utilization efficiency due to resource fragmentation.

  As can be seen from the comparison of FIG. 7A and FIG. 7B, frequency domain scheduling that considers priority levels based on the number of uplink transmissions for each UE group results in continuity (adjacency) constraints on radio resource allocation. This is particularly effective when a wireless communication system is used for the uplink. For example, in SC-FDMA used for LTE uplink, all resource blocks (RBs) allocated to each UE must be adjacent to each other. Such a continuity (adjacency) constraint complicates uplink scheduling and leads to a decrease in resource usage efficiency due to fragmentation of uplink radio resources.

  As understood from FIG. 7B, according to the frequency domain scheduling considering the priority level based on the number of uplink transmissions of each UE group, the UE group 153 (ie, UE) having a relatively small number of uplink transmissions. -A) is preferentially assigned radio resources within the transmission period and is therefore less susceptible to resource fragmentation. On the other hand, the UE group 152 (ie, UE-B and UE-C) having a relatively large number of uplink transmissions is susceptible to resource fragmentation because the resource allocation order is behind, but different resource fragments. It is robust against resource fragmentation because multiple uplink transmissions can be performed using. Therefore, frequency domain scheduling that takes into account the priority level based on the number of uplink transmissions for each UE group is advantageous in that it is easy to maintain fairness between UE groups even if fragmentation of radio resources occurs. There is.

  Subsequently, in the following, some specific examples of the method for detecting the association between the remote UE 1 and the relay UE 2 in the base station 3 will be described. In some implementations, the base station 3 receives from the remote UE1 first control information including an identifier of at least one relay UE2 to which the remote UE1 is connected, and based on the first control information The association between the remote UE1 and the relay UE2 may be detected. The identifier of the relay UE2 may include, for example, a ProSe Relay UE ID, a Cell Radio Network Temporary Identifier (C-RNTI), or a Sidelink RNTI (SL-RNTI). Thereby, the base station 3 can detect the UE group related to the data transmission of the remote UE1.

  The first control information may be an SL-DestinationInfoListUC information element in the Sidelink UE information message. The Sidelink UE information message is an RRC message transmitted from the UE to E-UTRAN (eNB). The UE sends a Sidelink UE information message, for example, to inform E-UTRAN that the UE is interested in the sidelink or no longer interested. In addition, the UE transmits a Sidelink UE information message to request assignment or release of transmission resources for side link communication or discovery announcement. The SL-DestinationInfoListUC information element included in the Sidelink UE information message indicates a destination of unicast sidelink transmission. The unicast destination is specified by Layer-2 ID for unicast or ProSe Relay UE ID.

  Alternatively, the first control information may be a Destination Index field in the Sidelink BSR MAC Control Element (CE). The Sidelink BSR MAC CE is transmitted from the UE to the E-UTRAN (eNB) in order to notify how much transmission waiting data is in the UE sidelink transmission buffer. The Destination Index field included in the Sidelink BSR MAC CE specifies the destination of ProSe direct communication (side link communication). In the case of one-to-many ProSe Direct Communication (one-to-many sidelink communication), the Destination Index field indicates a ProSe Layer-2 Group ID. On the other hand, in the case of one-to-one ProSe Direct Communication (unicast sidelink communication), the Destination Index field indicates Layer-2 ID for unicast or ProSe Relay UE ID. One-to-one ProSe Direct Communication (unicast sidelink communication) includes unicast sidelink communication between a remote UE and a relay UE.

  FIG. 8 is a sequence diagram showing an example (process 800) of UE group detection by the base station 3. In the example of FIG. 8, the remote UE1 performs relay selection. Relay selection by the remote UE 1 is called distributed relay selection. In step 801, the remote UE1 and the relay UE2 execute a relay discovery procedure for the remote UE1 to discover the relay UE2. For example, according to a so-called announcement model (model A), the relay UE2 may transmit a discovery signal, and the remote UE1 may discover the relay UE2 by detecting the discovery signal from the relay UE2. Instead, according to a so-called solicitation / response model (model B), the remote UE1 transmits a discovery signal indicating that it wants to relay, and the relay UE2 transmits a response message to the discovery signal to the remote UE1. And the remote UE1 may discover the relay UE2 by receiving a response message from the relay UE2.

  In step 802, the remote UE1 selects at least one appropriate relay UE2 from the one or more relays UE2 discovered in step 801. In Step 803, the remote UE1 establishes a connection for one-to-one ProSe Direct Communication (unicast sidelink communication) with any one of the selected at least one relay UE2. For example, the remote UE1 may transmit a direct communication request (or relay request) to the relay UE2. The relay UE2 may start a procedure for mutual authentication in response to receiving the direct communication request (or relay request).

  In Step 804, the remote UE 1 transmits a Sidelink UE information message to the base station 3. The Sidelink UE information message indicates the identifier (e.g., ProSe Relay UE ID) of the relay UE2 to which the remote UE1 is connected in step 803. In Step 805, the base station 3 detects the association between the remote UE1 and the relay UE2 in response to the reception of the Sidelink UE information message.

  Instead, in some implementations, the base station 3 receives from the relay UE2 second control information that includes an identifier of one or more remote UE1s connected to the relay UE2, and the second Based on the control information, the association between the remote UE1 and the relay UE2 may be detected. The identifier of the remote UE 1 may include, for example, Layer-2 ID for unicast, Cell Radio Network Temporary Identifier (C-RNTI), or Sidelink RNTI (SL-RNTI). Thereby, the base station 3 can recognize one or more relay UE2 related to the data transmission of one remote UE1.

  Similar to the first control information described above, the second control information may be the SL-DestinationInfoListUC information element in the Sidelink UE information message, or in the Destination Index field in the Sidelink BSR MAC Control Element (CE). There may be. In these cases, the identifier of the remote UE 1 may be Layer-2 ID for unicast.

  FIG. 9 is a sequence diagram showing an example (process 900) of UE group detection by the base station 3. In the example of FIG. 9, the remote UE 1 performs relay selection. The processing in steps 901 to 903 is the same as the processing in steps 801 to 803 in FIG. In step 904, the relay UE2 transmits a Sidelink UE information message to the base station 3. The Sidelink UE information message indicates the identifier (e.g., ProSe Relay UE ID) of the remote UE 1 to which the relay UE 2 is connected in Step 903. In step 905, the base station 3 detects the association between the remote UE1 and the relay UE2 in response to the reception of the Sidelink UE information message.

  Instead, in some implementations, the base station 3 receives third control information including a group identifier from each remote UE1 and each relay UE2, and based on the third control information, the remote UE1 And a UE group or a relay UE2 may be detected. The group identifier is associated one-to-one with a UE group including a plurality of UEs related to data transmission of one remote UE1. For example, the group identifier may be determined by the remote UE1 and notified from the remote UE1 to each relay UE2. Or a group identifier may be notified to each remote UE1 and relay UE2 from a ProSe function entity or another control entity (e.g., Mobility Management Entity (MME)).

  Alternatively, in some implementations, the base station 3 may autonomously detect the association between the remote UE1 and the relay UE2. Specifically, the base station 3 may perform relay selection for each remote UE1. Relay selection by an entity in the network, such as base station 3, is called centralized relay selection. In this case, the base station 3 can completely grasp the association between the remote UE1 and the relay UE2 through the relay selection.

  FIG. 10 is a sequence diagram illustrating an example of UE group detection (processing 1000) by the base station 3. In the example of FIG. 10, the base station 3 performs relay selection. In step 1001, similarly to step 801 in FIG. 8, the remote UE1 and the relay UE2 execute a relay discovery procedure for the remote UE1 to discover the relay UE2.

  In step 1002, the remote UE 1 transmits a measurement report to the base station 3. The measurement report relates to one or more relay UEs 2 discovered in step 1001, and includes, for example, side link quality. The side link quality may include, for example, at least one of reception power, signal-to-interference plus noise ratio (SINR), and data rate (or throughput). Further, the measurement report may include the cellular link quality between the remote UE 1 and the base station 3 as in the existing measurement report. Furthermore, the measurement report may include backhaul link quality (between base station 3 and relay UE2).

  In Step 1003, the base station 3 selects an appropriate at least one relay UE2 from one or more relay UE2 discovered by the remote UE1. In step 1004, based on the relay selection result in step 1003, the base station 3 detects (records) the association between the remote UE1 and the relay UE2.

  In step 1005, the base station 3 instructs the remote UE1 to connect to the selected relay UE2. In Step 1006, the remote UE 1 establishes a connection for one-to-one ProSe Direct Communication (unicast sidelink communication) with a specific relay UE according to an instruction from the base station 3.

  Finally, configuration examples of the remote UE1, the relay UE2, the base station 3, and the UE4 according to the above-described embodiment will be described. FIG. 11 is a block diagram illustrating a configuration example of the remote UE 1. The relays UE2 and UE4 may also have the same configuration as that shown in FIG. The radio frequency (RF) transceiver 1101 performs analog RF signal processing to communicate with the base station 3. Analog RF signal processing performed by the RF transceiver 1101 includes frequency up-conversion, frequency down-conversion, and amplification. RF transceiver 1101 is coupled with antenna 1102 and baseband processor 1103. That is, the RF transceiver 1101 receives modulation symbol data (or OFDM symbol data) from the baseband processor 1103, generates a transmission RF signal, and supplies the transmission RF signal to the antenna 1102. Further, the RF transceiver 1101 generates a baseband received signal based on the received RF signal received by the antenna 1102 and supplies this to the baseband processor 1103.

  The RF transceiver 1101 may also be used for side link communication with other UEs. The RF transceiver 1101 may include multiple transceivers.

  The baseband processor 1103 performs digital baseband signal processing (data plane processing) and control plane processing for wireless communication. Digital baseband signal processing includes (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). On the other hand, control plane processing includes layer 1 (eg, transmission power control), layer 2 (eg, radio resource management, and hybrid automatic repeat request (HARQ) processing), and layer 3 (eg, attach, mobility, and call management). Communication management).

  For example, in LTE and LTE-Advanced, digital baseband signal processing by the baseband processor 1103 includes packet data convergence protocol (PDCP) layer, Radio Link Control (RLC) layer, MAC layer, and PHY layer signal processing. But you can. The control plane processing by the baseband processor 1103 may include non-access stratum (NAS) protocol, RRC protocol, and MAC CE processing.

  The baseband processor 1103 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 a micro processing unit. (MPU)). In this case, a protocol stack processor that performs control plane processing may be shared with an application processor 1104 described later.

  The application processor 1104 is also called a CPU, MPU, microprocessor, or processor core. The application processor 1104 may include a plurality of processors (a plurality of processor cores). The application processor 1104 is a system software program (Operating System (OS)) read from the memory 1106 or a memory (not shown) and various application programs (for example, a call application, a web browser, a mailer, a camera operation application, music playback) By executing the application, various functions of the remote UE 1 are realized.

  In some implementations, the baseband processor 1103 and the application processor 1104 may be integrated on one chip, as indicated by the dashed line (1105) in FIG. In other words, the baseband processor 1103 and the application processor 1104 may be implemented as one System on Chip (SoC) device 1105. The SoC device is sometimes called a system large scale integration (LSI) or chipset.

  The memory 1106 is a volatile memory, a nonvolatile memory, or a combination thereof. The memory 1106 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, or hard disk drive, or any combination thereof. For example, the memory 1106 may include an external memory device accessible from the baseband processor 1103, the application processor 1104, and the SoC 1105. Memory 1106 may include an embedded memory device integrated within baseband processor 1103, application processor 1104, or SoC 1105. Further, the memory 1106 may include a memory in a universal integrated circuit card (UICC).

  The memory 1106 may store a software module (computer program) including an instruction group and data for performing processing by the remote UE 1 described in the above-described embodiments. In some implementations, the baseband processor 1103 or the application processor 1104 is configured to read and execute the software module from the memory 1106 to perform the processing of the remote UE 1 described with reference to the drawings in the above-described embodiment. May be.

  FIG. 12 is a block diagram illustrating a configuration example of the base station 3 according to the above-described embodiment. Referring to FIG. 12, the base station 3 includes an RF transceiver 1201, a network interface 1203, a processor 1204, and a memory 1205. The RF transceiver 1201 performs analog RF signal processing to communicate with the remote UE1 and the relay UE2. The RF transceiver 1201 may include multiple transceivers. RF transceiver 1201 is coupled to antenna 1202 and processor 1204. The RF transceiver 1201 receives modulation symbol data (or OFDM symbol data) from the processor 1204, generates a transmission RF signal, and supplies the transmission RF signal to the antenna 1202. Further, the RF transceiver 1201 generates a baseband received signal based on the received RF signal received by the antenna 1202 and supplies this to the processor 1204.

  The network interface 1203 is used to communicate with network nodes (e.g., Mobility Management Entity (MME) and Serving Gateway (S-GW)). The network interface 1203 may include, for example, a network interface card (NIC) compliant with IEEE 802.3 series.

  The processor 1204 performs digital baseband signal processing (data plane processing) and control plane processing for wireless communication. For example, in the case of LTE and LTE-Advanced, the digital baseband signal processing by the processor 1204 may include signal processing of a PDCP layer, an RLC layer, a MAC layer, and a PHY layer. Further, the control plane processing by the processor 1204 may include S1 protocol, RRC protocol, and MAC CE processing.

  The processor 1204 may include a plurality of processors. For example, the processor 1204 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.

  The memory 1205 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 1205 may include storage located remotely from processor 1204. In this case, the processor 1204 may access the memory 1205 via the network interface 1203 or an I / O interface not shown.

  The memory 1205 may store a software module (computer program) including an instruction group and data for performing processing by the base station 3 described in the above-described embodiments. In some implementations, the processor 1204 may be configured to perform the processing of the base station 3 described with reference to the drawings in the above-described embodiment by reading the software module from the memory 1205 and executing the software module.

<Other embodiments>
The processing and operations performed by the base station 3 including uplink scheduling described in the above-described embodiment are the Digital Unit (DU) or DU and Radio Unit (RU) included in the Cloud Radio Access Network (C-RAN) architecture. ) May be provided. 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 base station 3 described in the above embodiment may be provided by any one or a plurality of radio stations (RAN nodes).

  Furthermore, the above-described embodiment is merely an example relating to application of the technical idea obtained by the present inventors. That is, the technical idea is not limited to the above-described embodiment, and various changes can be made.

1 Remote UE
2 Relay UE
3 Base station 4 UE
201 uplink scheduler 1101 radio frequency (RF) transceiver 1103 baseband processor 1104 application processor 1106 memory 1204 processor 1205 memory

Claims (23)

Memory,
At least one processor coupled to the memory;
With
The at least one processor comprises:
A first group including one or more uplink transmissions by one or more wireless terminals related to the transfer of data originating from the first wireless terminal, Configured to distinguish from a second group comprising one or more uplink transmissions by one or more wireless terminals involved in the transfer;
Whether or not the first group should be prioritized over the second group when allocating uplink radio resources within a transmission period depends on the number of uplink transmissions in each group or the number of radio terminals in each group. Determine based at least in part,
Configured as
A device for uplink scheduling. The at least one processor preferentially uplinks radio resources in the transmission period with respect to one of the first and second groups having a smaller number of uplink transmissions or a smaller number of radio terminals than the other one. Configured to assign,
The apparatus of claim 1. The at least one processor calculates, for each of the first and second groups, a scheduling metric based at least on a priority level that varies inversely with the number of wireless terminals in the group or the number of uplink transmissions; Configured to perform uplink radio resource allocation within the transmission period based on scheduling metrics of the first and second groups;
The apparatus according to claim 1 or 2. The one or more wireless terminals for the first group include the first wireless terminal;
The one or more wireless terminals for the second group include the second wireless terminal;
The apparatus according to claim 1. The one or more wireless terminals for the first group include at least one relay terminal;
Each relay terminal receives the first through a device-to-device (D2D) link between each relay terminal and the first wireless terminal and a backhaul link between each relay terminal and the base station. Relay traffic between a wireless terminal and the base station;
The apparatus of any one of Claims 1-4. The at least one processor is configured to detect the first group based on first control information transmitted from the first wireless terminal and including an identifier of the at least one relay terminal. Yes,
The apparatus according to claim 1. The first control information includes an SL-DestinationInfoListUC information element in a Sidelink UE information message transmitted using a Radio Resource Control message.
The apparatus according to claim 6. The first control information includes a Group index field in a Sidelink Buffer Status Report MAC Control Element.
The apparatus according to claim 6. The at least one processor is based on second control information transmitted from each of the at least one relay terminal and including an identifier of the first wireless terminal connected to each relay terminal. Configured to detect groups of
The apparatus according to claim 1. The at least one processor is based on third control information transmitted from each of the first wireless terminal and the at least one wireless terminal and including a group identifier indicating the first group. Or configured to detect more wireless terminals,
The apparatus according to claim 1. Each of the one or more uplink transmissions is an uplink logical channel or uplink bearer;
The device according to claim 1. The transmission period includes a subframe,
The device according to claim 1. A first group including one or more uplink transmissions by one or more wireless terminals related to the transfer of data originating from the first wireless terminal, Distinguishing from a second group comprising one or more uplink transmissions by one or more wireless terminals involved in the transfer, and said first group upon allocation of uplink radio resources within a transmission period Determining whether to prioritize the second group based at least in part on the number of uplink transmissions in each group or the number of wireless terminals in each group;
A method for uplink scheduling comprising: In the determination, the uplink radio resource in the transmission period is preferentially given to one of the first and second groups having a smaller number of uplink transmissions or a smaller number of wireless terminals than the other one. Including assigning,
The method of claim 13. The determining calculates, for each of the first and second groups, a scheduling metric based at least on a priority level that varies inversely with the number of wireless terminals in the group or the number of uplink transmissions; Performing uplink radio resource allocation within the transmission period based on scheduling metrics of the first and second groups;
15. A method according to claim 13 or 14. The one or more wireless terminals for the first group include the first wireless terminal;
The one or more wireless terminals for the second group include the second wireless terminal;
The method according to any one of claims 13 to 15. The one or more wireless terminals for the first group include at least one relay terminal;
Each relay terminal receives the first through a device-to-device (D2D) link between each relay terminal and the first wireless terminal and a backhaul link between each relay terminal and the base station. Relay traffic between a wireless terminal and the base station;
The method according to any one of claims 13 to 16. Detecting the first group based on first control information transmitted from the first wireless terminal and including an identifier of the at least one relay terminal;
The method according to any one of claims 13 to 17. The first control information includes an SL-DestinationInfoListUC information element in a Sidelink UE information message transmitted using a Radio Resource Control message.
The method of claim 18. The first control information includes a Group index field in a Sidelink Buffer Status Report MAC Control Element.
The method of claim 18. Detecting the first group based on second control information transmitted from each of the at least one relay terminal and including an identifier of the first wireless terminal connected to each relay terminal. In addition,
The method according to any one of claims 13 to 16. The one or more wireless terminals are transmitted from each of the first wireless terminal and the at least one wireless terminal and based on third control information including a group identifier indicating the first group. Further comprising detecting,
The method according to any one of claims 13 to 18.   The program for making a computer perform the method of any one of Claims 13-22.

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