WO2015171202A1 - Device-to device communications apparatus and methods - Google Patents

Device-to device communications apparatus and methods Download PDF

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Publication number
WO2015171202A1
WO2015171202A1 PCT/US2015/021045 US2015021045W WO2015171202A1 WO 2015171202 A1 WO2015171202 A1 WO 2015171202A1 US 2015021045 W US2015021045 W US 2015021045W WO 2015171202 A1 WO2015171202 A1 WO 2015171202A1
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WO
WIPO (PCT)
Prior art keywords
wireless terminal
radio resources
node
radio
communications
Prior art date
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Ceased
Application number
PCT/US2015/021045
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English (en)
French (fr)
Inventor
Jia SHENG
Shohei Yamada
John Michael KOWALSKI
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Sharp Laboratories of America Inc
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Sharp Laboratories of America Inc
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Filing date
Publication date
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Priority to CN201580020596.4A priority Critical patent/CN106233780B/zh
Priority to EP15789525.1A priority patent/EP3141038B1/en
Priority to JP2016564987A priority patent/JP6407304B2/ja
Publication of WO2015171202A1 publication Critical patent/WO2015171202A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/23—Manipulation of direct-mode connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • the technology relates to wireless communications, and particularly to allocating or granting radio resources for wireless device-to-device (D2D)
  • D2D wireless device-to-device
  • D2D communication in which two or more user equipment terminals directly communicate with one another.
  • voice and data traffic (referred to herein as "communication signals") from one user equipment terminal to one or more other user equipment terminals may not be communicated through a base station or other network control device of a telecommunication system.
  • D2D Device-to-device
  • 3GPP TS 36.211 vl2.4.0 Technical Specification, 3 rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 12) (2014-12);
  • 3 GPP TS 36.212 vl2.3.0 Technical Specification, 3 rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Multiplexing and Channel Coding (Release 12) (2014-12);
  • 3GPP TS 36.214 vl2.1.0 Technical Specification, 3 rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Layer; Measurements (Release 12) (2014-12);
  • D2D communications provide proximity-based applications and services, representing an emerging social-technological trend.
  • ProSe Proximity Services
  • LTE Long Term Evolution
  • the introduction of a Proximity Services (ProSe) capability in LTE allows the 3GPP industry to serve this developing market, and, at the same time, serve the urgent needs of several Public Safety communities that are jointly committed to LTE.
  • ProSe Proximity Services
  • the current assumptions related to D2D communication is that a wireless terminal within network coverage uses resources for D2D discovery and communication assigned by the controlling node. If the wireless terminal is out of network coverage, it may use pre- assigned resources for communications.
  • the wireless terminal incorrectly determines its situation of in/out of network coverage, e.g., if the wireless terminal tries to use the pre-assigned resources within network coverage, it may affect the current LTE networks with strong interference and thereby be very dangerous. Therefore, a problem which needs to be solved for D2D communications is how the wireless terminal determines whether it is in or out of network coverage.
  • D2D services include ProSe Direct Communication (e.g., D2D
  • ProSe Direct Communication is a mode of communication whereby two wireless terminals can communicate with each other directly over the PC5 interface (i.e., direct interface between two wireless terminals).
  • SA Scheduling assignment
  • ProSe Direct Discovery is defined as the procedure used by the ProSe-enabled wireless terminal to discover other ProSe-enabled wireless terminal(s) in its proximity using E-UTRA direct radio signals via the PC5 interface.
  • the network coverage detection should be based on the downlink received power.
  • the downlink received power is measured with respect to cell-specific reference signal strength.
  • the coverage can be defined by wireless terminal's downlink received power measurement, or be defined by wireless terminal's RRC state for simpler implementation and specification work..
  • the downlink radio link quality of the primary cell is monitored by the wireless terminal for the purpose of indicating out-of-sync/in-sync status to higher layers.
  • the physical layer in the wireless terminal shall, in radio frames where the radio link quality is assessed, indicate out-of-sync to higher layers through a radio link failure (RLF) report when the radio link quality is worse than the threshold Qout.
  • RLF radio link failure
  • the physical layer in the wireless terminal shall, in radio frames where the radio link quality is assessed, indicate in-sync to higher layers.
  • LTE Long Term Evolution
  • RRC radio resource control
  • RRC CONNECTED A wireless terminal is in RRC CONNECTED when an RRC connection has been established. If this is not the case (i.e., if no RRC connection is established) the wireless terminal is in RRC IDLE state.
  • some metrics such as the synchronization signal (SS) strength or broadcast signal strength, may be defined as measurement of out-of-coverage. However, these metrics are very complicated to be implemented in LTE networks. All of these bring new heavy burdens to legacy LTE networks.
  • the wireless terminal needs to behave correctly based on whether it is in or outside the coverage of network, so as to minimize its compact (interference) on the present networks, e.g., LTE networks.
  • a problem in this area is to detect the network coverage accurately and efficiently, so that (among other reasons) the wireless terminal in device-to-device (D2D) communications will not interfere with network operation.
  • the resource allocation to UE needs to be performed correctly based on whether it is in or outside the coverage of network, so as to minimize its compact (interference) on the present networks, e.g., LTE networks.
  • the issue of load balancing may also be pertinent for an in coverage scenario when one resource allocation method cannot have adequate resources for allocation while another method still has enough resources.
  • the detection problem can easily be solved by methods associated with legacy LTE RRC states (in the agreements of 3 GPP TSG RAN WG2 Meeting #85-bis), e.g., the UE is in coverage if it is in RRC CONNECTED state.
  • a complication may arise, for example, when one carrier of the UE is in RRC CONNECTED mode, and another carrier has no RRC connection.
  • the technology disclosed herein concerns a method in a wireless terminal which is in wireless communications with a radio access node over a radio interface.
  • the method comprises the wireless terminal making a determination regarding a type of radio resources that the wireless terminal may use for device-to-device (D2D) communications with another wireless terminal.
  • the determination comprises:
  • RRC Radio Resource Control
  • Connected state and the wireless terminal is configured by the node to use the network- allocated radio resources
  • the wireless terminal is in a Radio Resource Control (RRC) Idle state and camps on a cell;
  • RRC Radio Resource Control
  • the wireless terminal has a downlink signal strength higher than a predetermined threshold
  • the wireless terminal is informed by broadcasted information from the node to use the network-allocated radio resources;
  • the wireless terminal is not informed by broadcasted information from the node to use the wireless terminal autonomous selected radio resources;
  • the wireless terminal cannot camp on any cell; (2c) the wireless terminal has a downlink signal strength lower than a predetermined threshold;
  • the wireless terminal experiences a predetermined radio link problem;
  • the wireless terminal is informed by dedicated information from the node to use the wireless terminal autonomous selected radio resources;
  • the wireless terminal is informed by broadcasted information from the node to use the wireless terminal autonomous selected radio resources;
  • the wireless terminal is not informed by broadcasted information from the node to use the network-allocated radio resources.
  • the method further comprises using for the device-to-device (D2D) communications the radio resources according to either the first mode determination or the second mode determination.
  • D2D device-to-device
  • the method further comprises the wireless terminal making the first mode determination that the wireless terminal should use the network-allocated radio resources if the wireless terminal is in a Radio
  • RRC Resource Control
  • the method further comprises the wireless terminal making the second mode determination that the wireless terminal should use wireless terminal autonomous selected radio resources when the wireless terminal experiences the predetermined radio link problem, and wherein the
  • predetermined radio link failure comprises a RLF failure or repeated failure of a RRC connection request when a UE camps on a cell.
  • the technology disclosed herein concerns a wireless terminal which is in wireless communications with a radio access node over a radio interface.
  • the wireless terminal comprises a transceiver configured for radio communications with the node and for device-to-device (D2D) communications with another wireless terminal and a processor.
  • the processor is configured to make a determination regarding a type of radio resources that the wireless terminal may use for device-to-device (D2D) communications with another wireless terminal.
  • the processor is configured:
  • Connected state and the wireless terminal is configured by the node to use the network- allocated radio resources
  • the wireless terminal is in a Radio Resource Control (RRC) Idle state and camps on a cell;
  • RRC Radio Resource Control
  • the wireless terminal has a downlink signal strength higher than a predetermined threshold
  • the wireless terminal is informed by dedicated information from the node to use the network-allocated radio resources; (le) the wireless terminal is informed by broadcasted information from the node to use the network-allocated radio resources;
  • the wireless terminal is not informed by broadcasted information from the node to use the wireless terminal autonomous selected radio resources;
  • the wireless terminal has a downlink signal strength lower than a predetermined threshold; (2d) the wireless terminal experiences a predetermined radio link problem;
  • the wireless terminal is informed by dedicated information from the node to use the wireless terminal autonomous selected radio resources;
  • the processor is further configured to make the first mode determination that the wireless terminal should use the network-allocated radio resources if the wireless terminal is in a Radio Resource Control (RRC)
  • RRC Radio Resource Control
  • the technology disclosed herein concerns a method in a wireless terminal which is in wireless communications with a radio access node over a radio interface.
  • the method comprises, upon occurrence of a predetermined physical layer condition, the wireless terminal using at least some wireless terminal autonomous selected device-to-device (D2D) radio resources for device-to-device (D2D) communications with another wireless terminal when the wireless terminal is in coverage of the radio access network.
  • the method further comprises the wireless terminal transmitting device-to-device (D2D) signals to the another wireless terminal using at least some wireless terminal autonomous selected device-to-device (D2D) radio resources when the wireless terminal is in coverage of the radio access network.
  • the method further comprises the wireless terminal obtaining the at least some wireless terminal autonomous selected device-to-device (D2D) radio resources from a pre-configured pool of radio resources stored in a memory of the wireless terminal.
  • the predetermined physical layer condition comprises a radio link failure.
  • the processor is further configured to use the at least some wireless terminal autonomous selected device-to-device (D2D) radio resources for device-to-device (D2D) communications with the another wireless terminal until the wireless terminal when receives a subsequent instruction to use different radio resources.
  • D2D device-to-device
  • the wireless terminal sends to the node wireless terminal capability information related to support transmission of D2D communications for combinations of the plural frequency bands.
  • Fig.l 1 shows a example of multi-carrier communications receiving and/or transmitting WAN signals in first carrier frequency(ies) and transmitting D2D signals in second carrier frequency(ies), where simultaneous transmission (time overlapping) is supported.
  • cellular network can refer to a network distributed over cells, each cell served by at least one fixed-location transceiver, such as a base station.
  • a "cell” may be any communication channel that is specified by standardization or regulatory bodies to be used for International Mobile
  • TS 36.304 (V 1 1.6.0) lists five radio resource control (RRC) states for a wireless terminal, three of which pertain to Idle Mode. The three RRC states which pertain to Idle Mode are: "Camped Normally", “Camped on Any CelF; and "Any Cell Selection”.
  • the wireless terminal selects and monitors the indicated Paging Channels of the cell according to information sent in system information; monitors relevant System Information (SI); performs necessary measurements for the cell reselection evaluation procedure; and executes the cell reselection evaluation process upon occurrence of certain occasions/triggers.
  • SI System Information
  • the wireless terminal performs cell selection/reselection to an acceptable cell of any supported RAT regardless of priorities provided in system information from current cell, if no suitable cell is found.
  • the wireless terminal scans all radio frequency (RF) channels in the E-UTRA bands according to its capabilities to find available PLMNs.
  • RF radio frequency
  • the wireless terminal searches for the strongest cell and reads its system information, in order to find out to which PLMN(s) the cell belongs. If the wireless terminal can read one or several PLMN identities in the strongest cell, each found
  • PLMN is reported to the NAS as a high quality PLMN (but without the RSRP value), provided that the certain quality criterion is fulfilled. Found PLMNs that do not satisfy the high quality criterion, but for which the wireless terminal has been able to read the PLMN identities, are reported to the NAS together with the RSRP value.
  • the cell selection procedure is performed in order to select a suitable cell of that PLMN to camp on. [00094] In a cell selection and re-selection procedure the wireless terminal performs certain specified measurements.
  • Fig. 1 A shows an example communications system 20 wherein radio access node 22 communicates over air or radio interface 24 with first wireless terminal 26i.
  • the node 22 comprises node processor 30 and node transmitter 32.
  • the first wireless terminal 26i comprises terminal processor 40 and terminal transceiver 42.
  • the terminal transceiver 42 typically comprises terminal transmitter circuitry 44 and terminal receiver circuitry 46.
  • node 22 and first wireless terminal 261 communicate with each other across radio interface 24, and may do so using "frames" of information that are typically formatted and prepared by a scheduler of node 22.
  • LTE Long Term Evolution
  • a frame which may have both downlink portion(s) and uplink portion(s), is communicated between the node and the wireless terminal.
  • Each LTE frame may comprise plural subframes.
  • each LTE subframe may be divided into two slots.
  • the transmitted signal in each slot is described by a resource grid comprised of resource elements (RE).
  • RE resource elements
  • LTE defines a number of downlink physical channels which carry information received from Medium Access Control (MAC) and higher layers.
  • PDSCH Physical Downlink Shared Channel
  • These shared resources are controlled by one or more schedulers that assign(s) different parts of the downlink and uplink shared channels to different wireless terminals for reception and transmission respectively.
  • the assignments for the shared channels are transmitted in a control region which is provided in the beginning of each downlink subframe.
  • the Physical Downlink Control Channel (PDCCH) carries the resource assignment for wireless terminals.
  • a wireless terminal desires to send information on the uplink to the node 22, the wireless terminal sends a scheduling request to the node 22 followed by a buffer status report (BSR) from which the node 22 can determine that the wireless terminal intends to perform an uplink transmission. Thereafter in a downlink (DL) subframe the node 22 indicates on the Physical Downlink Control Channel (PDCCH) what radio resources the wireless terminal may use for its desired uplink transmission, e.g., the node 22 provides an uplink grant for an uplink transmission.
  • BSR buffer status report
  • wireless terminals may be any wireless terminals.
  • Such terminal-to-terminal communications are also called device- to-device (D2D) communications.
  • D2D device- to-device
  • the device-to-device (D2D) communications may be under network control or "in-coverage", meaning that one or more of the wireless terminal involved in the device-to-device (D2D) communications may be within range of radio frequencies utilized by a node or cell of a radio access network (RAN).
  • RAN radio access network
  • the terminal transceiver 42 preferably comprises terminal transmitter circuitry ("transmitter”) 44 and terminal receiver circuitry (“receiver”) 46.
  • the receiver 46 of first wireless terminal 26i receives subframe S communicated over radio interface 24 from communications system 20.
  • the terminal processor 40 may obtain a device-to- device (D2D) grant from the subframe S.
  • the device-to-device (D2D) grant specifies radio resources that first wireless terminal 26i is permitted to use for device-to-device (D2D) communication with another wireless terminal, e.g., second wireless terminal
  • first wireless terminal 261 serves, e.g., to transmit data on the uplink (UL) from first wireless terminal 261 to node 22, but may also serve to transmit device-to-device (D2D) data to another wireless terminal(s), e.g., second wireless terminal 26 2 , using the radio resources permitted by the D2D grant.
  • D2D device-to-device
  • a first mode has several names (all used interchangeably herein), such as "Mode 1", the "eNB scheduled resource allocation mode", and the "network-allocated resource mode”. Mode 1 is characterized by: (1) the wireless terminal needing to be
  • the wireless terminal requesting transmission resources from the node (the node schedules transmission resources for transmission of scheduling assignment(s) and data); (3) the wireless terminal sending a scheduling request (D-SR or Random Access) to the node followed by a buffer status report (BSR). Based on the BSR the node can determine that the wireless terminal has data for a ProSe Direct Communication transmission and estimate the resources needed for transmission.
  • D-SR scheduling request
  • BSR buffer status report
  • a second mode also has several names (used interchangeably herein), such as "Mode 2", the "wireless terminal selected resource” mode (or, more simply, the “terminal selected resource mode), and the “wireless terminal (UE) autonomous resource selection mode".
  • Mode 2 is characterized by the wireless terminal (UE) on its own selecting resources from resource pools to transmit scheduling assignment and data. The fact that a wireless terminal selects resources “on its own” indicates that the resource selection is “autonomous”.
  • One of the aspects of the technology disclosed herein provides, e.g., techniques for determining when a wireless terminal such as wireless terminal 261 is out-of-coverage.
  • the wireless terminal 261 When out-of-coverage, the wireless terminal 261 is no longer entitled for device-to-device (D2D) communications to use the network radio resources which are dynamically allocated by node 22. That is, when out-of-coverage the wireless terminal may not use Mode 1. Instead, when out-of-coverage, the wireless terminal 26i must use for device-to-device (D2D) communications (e.g., communications with other wireless terminals such as second wireless terminal 26 2 ) resources selected by the wireless terminal from a pre-configured pool of radio resources (e.g., a wireless terminal selected resource mode). That is, when out-of-coverage the wireless terminal uses Mode 2.
  • Fig. 1 A shows terminal processor 40 having access to device-to-device (D2D) resource pool 48, which may at least partially be stored in memory for access by terminal processor 40.
  • D2D device-to-device
  • D2D controller 50 Among the functions performed by device-to-device (D2D) controller 50 are (B) Cell Selection/Re- Selection strategies; (C) determining out-of-coverage situations; (X) determining conditions applicable for the D2D modes; (Y) receiving an indication from node 22 of the particular D2D mode for which the wireless terminal is authorized to operate; (F) determining to use D2D Mode 2 upon occurrence of a physical layer problem; and (G) multi-carrier communications and resource allocation therefor. While one or more of these functions may be performed together in a same example embodiment and mode, each function may also be separately performed without necessarily implementing or involving aspects of other functions.
  • Fig. IB shows that the device-to-device (D2D) controller 50 of wireless terminal 26i may, in an embodiment and mode, comprise cell selection/re-selection logic 50B.
  • Fig. 2 shows basic, example acts or steps involved in a generic method of operating a wireless terminal engaged in device-to-device (D2D) communications, and particularly different types of cell selection/re-selection strategies which may be utilized in conjunction with the example out-of-coverage detection methods. In an example embodiment and mode the acts of Fig. 2 may be performed by cell
  • the wireless terminal is receiving or transmitting, or anticipating receiving or transmitting, device-to-device (D2D) signals on device-to-device (D2D) supported frequencies, and as a result of such actual or anticipated receiving or transmitting the wireless terminal is therefore "camped” on a particular frequency and is receiving the "camped on” frequencies through its receiver circuit 46.
  • D2D device-to-device
  • D2D device-to-device
  • the candidate frequencies at which the wireless terminal cannot receive or transmit device-to-device (D2D) signals are considered in the D2D prioritized strategy of act 2-1 to be low priority candidate frequencies as just stated, then naturally the candidate frequencies at which the wireless terminal can receive or transmit device-to-device (D2D) signals, including the camped-on frequency, are considered to be high priority candidate frequencies. Logically the already camped-on frequency will be considered to be the highest priority candidate frequency.
  • the wireless terminal and particularly terminal processor 40 selects a candidate frequency for use in the device-to-device (D2D) communications.
  • the terminal processor 40 may select a high priority candidate as the candidate frequency for use in the device-to-device (D2D) communications.
  • terminal processor 40 comprises device-to-device (D2D) controller 50 with coverage detection logic 50C and radio resource control (RRC) state machine 52.
  • D2D device-to-device
  • RRC radio resource control
  • terminal processor 40 and particularly device-to-device (D2D) controller 50 thereof uses predefined RRC Idle state transitions to determine when a wireless terminal engaged in device-to-device (D2D) communications encounters an out-of-coverage situation (e.g., a wireless terminal selected resource mode).
  • Fig. 3 A shows basic, example acts or steps involved in a generic method of determining when a wireless terminal encounters an out-of-coverage situation for device-to-device (D2D) communications purposes.
  • "Device-to-device (D2D) communication purposes" (and likewise sidelink direction communication purposes) may comprise a wireless terminal engaged in device-to-device (D2D) communications (e.g., already participating in device-to-device (D2D) communications) or anticipating participating in device-to-device (D2D) communications.
  • the example method of Fig. 3 may be used in conjunction with either the D2D prioritized strategy of act 2-1 or the D2D only strategy of act 2-2.
  • Act 3A-1 comprises the terminal processor 40 using a predefined RRC Idle state transition to determine when a wireless terminal engaged in device-to-device (D2D) communications encounters an out-of-coverage situation.
  • Act 3 A-2 comprises, when the out-of-coverage situation is determined, the terminal processor 40 transmitting (over terminal transmitter circuitry 44) device-to-device (D2D) signals using pre-configured resources.
  • act 3 A-2 may comprise the terminal processor 40 causing the transmitter 44 of wireless terminal to transmit device-to-device (D2D) signals using resources selected by the wireless terminal from pre-configured device-to-device (D2D) radio resources.
  • D2D device-to-device
  • Fig. 3B shows basic, example acts or steps involved in a counter-based method of determining when a wireless terminal engaged in device-to-device (D2D) communications encounters an out-of-coverage situation (e.g., a wireless terminal selected resource mode).
  • Act 3B-1 which corresponds to an implementation of act 3A- 1 , comprises the terminal processor 40 starting a resource mode counter 60 (e.g., an out-of-coverage counter) when the wireless terminal undergoes any one of the set of predefined RRC Idle state transitions.
  • a resource mode counter 60 e.g., an out-of-coverage counter
  • wireless terminal UE-I is in-coverage of node 22 (and accordingly operates in accordance with Mode 1 , using the network-allocated resources scheduled by node 22) but UE-O is out-of-coverage (and thus uses the pre- configured device-to-device (D2D) radio resources).
  • D2D device-to-device
  • a radio access node 22 may broadcast an indication that the node supports a mode in which the wireless terminal when in-coverage may use resources selected by the wireless terminal from the pre-configured pool of radio resources (e.g., another form of the terminal selected resource mode). For example, iff a wireless terminal is in RRC Idle state, the wireless terminal may receive (e.g., at receiver 46), via broadcasted system information, an indication of supporting of a mode using resources selected by the wireless terminal from a pre-configured pool of radio resources. Fig.
  • the node 22 may, in an example embodiment and mode, send to the wireless terminal an indication which specifies, for device-to-device (D2D) communications with another wireless terminal, whether the wireless terminal is to use network-allocated radio resources or radio resources which are selected by the wireless terminal.
  • the node processor 30 may send to the wireless terminal an indication which specifies that the wireless terminal when in network coverage is use radio resources which are selected by the wireless terminal for device-to-device (D2D)communications with the another wireless terminal.
  • mode 1 can be configured only in the first carrier frequency (ies).

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  • Engineering & Computer Science (AREA)
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PCT/US2015/021045 2014-05-08 2015-03-17 Device-to device communications apparatus and methods Ceased WO2015171202A1 (en)

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Application Number Priority Date Filing Date Title
CN201580020596.4A CN106233780B (zh) 2014-05-08 2015-03-17 无线终端及其方法
EP15789525.1A EP3141038B1 (en) 2014-05-08 2015-03-17 Device-to device communications apparatus and methods
JP2016564987A JP6407304B2 (ja) 2014-05-08 2015-03-17 デバイス・ツー・デバイス通信装置および方法

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US61/990,658 2014-05-08

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JP6407304B2 (ja) 2018-10-17
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US20150327240A1 (en) 2015-11-12
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