Switching mode of operation in D2D communications
First Claim
1. A method of device to device (D2D) wireless communication at a user equipment (UE), comprising:
- receiving a connection response message from a base station comprising one or more mode switching parameters, the one or more switching parameters relating to an indication of an imminent radio link failure (RLF) with the base station;
establishing communications with one or more other UEs according to a first D2D mode, the first D2D mode based at least in part on a centralized transmission resource schedule received from the base station;
determining that the one or more mode switching parameters have been satisfied;
switching to a second D2D mode before the RLF occurs, the second D2D mode based at least in part on a distributed transmission scheduling using a first indication of a pool of resources allocated by the base station;
monitoring communications from the base station for a second indication of the pool of resources;
determining that a message from the base station indicating the pool of resources is not available; and
switching to a third D2D mode, the third D2D mode based at least in part on a distributed transmission utilizing a preconfigured resource pool.
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Accused Products
Abstract
Methods, systems, and devices are described for switching a mode of operations in device to device (D2D) communications. A UE within the coverage area of a base station may communicate directly with other UEs using a centralized transmission resource schedule. Prior to experiencing radio link failure (RLF), the UE may determine that switching parameters have been met and transition to an intermediate mode based on a distributed transmission schedule using a pool of resources established by the base station. In one example, the switching parameters may be received from the base station in a connection response message. In another example, the UE may send a switching request to the base station prior to initiating the transition to the intermediate mode. In some cases, after the transition to the intermediate mode, the UE may experience a radio link failure and transition to a distributed mode using a predetermined pool of resources.
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Citations
30 Claims
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1. A method of device to device (D2D) wireless communication at a user equipment (UE), comprising:
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receiving a connection response message from a base station comprising one or more mode switching parameters, the one or more switching parameters relating to an indication of an imminent radio link failure (RLF) with the base station; establishing communications with one or more other UEs according to a first D2D mode, the first D2D mode based at least in part on a centralized transmission resource schedule received from the base station; determining that the one or more mode switching parameters have been satisfied; switching to a second D2D mode before the RLF occurs, the second D2D mode based at least in part on a distributed transmission scheduling using a first indication of a pool of resources allocated by the base station; monitoring communications from the base station for a second indication of the pool of resources; determining that a message from the base station indicating the pool of resources is not available; and switching to a third D2D mode, the third D2D mode based at least in part on a distributed transmission utilizing a preconfigured resource pool. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An apparatus for device to device (D2D) wireless communication at a user equipment (UE), comprising:
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a processor; memory in electronic communication with the processor; and instructions stored in the memory, the instructions being executable by the processor to; receive a connection response message from a base station comprising one or more mode switching parameters, the one or more switching parameters relating to an indication of an imminent radio link failure (RLF) with the base station; establish communications with one or more other UEs according to a first D2D mode, the first D2D mode based at least in part on a centralized transmission resource schedule received from the base station; determine that the one or more mode switching parameters have been satisfied, wherein the one or more mode switching parameters comprise an indication from a user application; sending a mode switching request to the base station, wherein the mode switching request comprises a user initiated mode switch indication; and switch to a second D2D mode before the RLF occurs, the second D2D mode based at least in part on a distributed transmission scheduling using a pool of resources allocated by the base station. - View Dependent Claims (23, 24)
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25. An apparatus for device to device (D2D) wireless communication at a user equipment (UE), comprising:
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a processor; memory in electronic communication with the processor; and instructions stored in the memory, the instructions being executable by the processor to; receive a connection response message from a base station comprising one or more mode switching parameters, the one or more switching parameters relating to an indication of an imminent radio link failure (RLF) with the base station; establish communications with one or more other UEs according to a first D2D mode, the first D2D mode based at least in part on a centralized transmission resource schedule received from the base station; determine that the one or more mode switching parameters have been satisfied; switch to a second D2D mode before the RLF occurs, the second D2D mode based at least in part on a distributed transmission scheduling using a first indication of a pool of resources allocated by the base station; monitor communications from the base station for a second indication of the pool of resources; determine that a message from the base station indicating the pool of resources is not receivable; and switch to a third D2D mode, the third D2D mode being based on distributed transmission utilizing a preconfigured resource pool. - View Dependent Claims (28, 29, 30)
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26. A method of device to device (D2D) wireless communication, comprising:
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establishing communications with one or more other UEs according to a first D2D mode, the first D2D mode based at least in part on a preconfigured pool of transmission resources; receiving system information from a base station allocating a pool of resources for transmission; sending a mode switching request to the base station, wherein the mode switching request comprises a user initiated mode switch indication; switching to a second D2D mode based at least in part on one or more mode switching parameters, the second D2D mode being based on distributed transmission scheduling using the pool of resources allocated by the base station; modifying the one or more mode switching parameters, wherein the one or more mode switching parameters comprise an indication from a user application; and
continuing communications based on the distributed transmission scheduling until the one or more modified switching parameters are met. - View Dependent Claims (27)
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Specification