Signaling and channel designs for D2D communications
First Claim
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1. A method for operating an evolved Node B (eNB) in an LTE (Long Term Evolution) network, comprising:
- selecting first and second user equipments (UEs) for device-to-device (D2D) communications;
allocating a D2D time-frequency resource for the first UE to transmit to the second UE;
assigning the allocated D2D resource as a physical uplink shared channel (PUSCH) resource to the first UE;
assigning the allocated D2D resource as a physical downlink shared channel (PDSCH) resource to the second UE;
receiving a hybrid automatic repeat request (HARQ) ACK/NACK (positive or negative acknowledgement) from the second UE over the physical uplink control channel (PUCCH) in response to data transmitted to the second UE from the first UE over the allocated D2D resources;
receiving and decoding the data transmitted to the second UE from the first UE over the first UE'"'"'s PUSCH;
if the data received from the first UE is decoded correctly by the eNB and an ACK is received from the second UE, sending an ACK to the first UE; and
,if either the data received from the first UE is decoded incorrectly by the eNB or a NACK is received from the second UE, sending a NACK to the first UE.
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Abstract
Described are methods and devices for enabling D2D communications with signal structures that require minimal changes to the current LTE architecture. In the embodiments described, the eNB grants resources to UEs for D2D communication and either initiates or permits a pair of UEs to establish a D2D link. Certain embodiments are designed to minimize changes to the current LTE control signaling structure by having the control signaling always come from the eNB as in a normal cellular link so that the transmitting UE transmits over a data channel (e.g., PUSCH/PDSCH) that the receiving UE is able to decode.
33 Citations
20 Claims
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1. A method for operating an evolved Node B (eNB) in an LTE (Long Term Evolution) network, comprising:
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selecting first and second user equipments (UEs) for device-to-device (D2D) communications; allocating a D2D time-frequency resource for the first UE to transmit to the second UE; assigning the allocated D2D resource as a physical uplink shared channel (PUSCH) resource to the first UE; assigning the allocated D2D resource as a physical downlink shared channel (PDSCH) resource to the second UE; receiving a hybrid automatic repeat request (HARQ) ACK/NACK (positive or negative acknowledgement) from the second UE over the physical uplink control channel (PUCCH) in response to data transmitted to the second UE from the first UE over the allocated D2D resources; receiving and decoding the data transmitted to the second UE from the first UE over the first UE'"'"'s PUSCH; if the data received from the first UE is decoded correctly by the eNB and an ACK is received from the second UE, sending an ACK to the first UE; and
,if either the data received from the first UE is decoded incorrectly by the eNB or a NACK is received from the second UE, sending a NACK to the first UE. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for an evolved Node B (eNB), comprising:
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a radio transceiver; and
,processing circuitry to; selected fist and second user equipments (UEs for device-to-device (D2D) communications; allocate a D2D time-frequency resource for the first UE to transmit to the second UE; assign the allocated D2 resources as a physical uplink shared channel (PUSCH) resources to the first UE; assign the allocated D2D resources as a physical downlink shared channel (PDSCH) resource to the second UE; receive a hybrid automatic repeat request (HARQ) ACK/NACK (positive or negative acknowledgement) from the second UE over the physical uplink control channel (PUCCH) in response to data transmitted to the second UE from the first UE over the allocated D2D resources; receive and decode the data transmitted to the second UE from the first UE over the first UE'"'"'s PUSCH; if the data received from the first UE is decoded correctly by the eNB and an ACK is received from the second UE, send an ACK to the first UE; and
,if either the data received from the first UE is decoded incorrectly by the eNB or a NACK is received from the second UE, send a NACK to the first UE. - View Dependent Claims (14, 15, 16)
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17. A non-tansitory computer-readable medium comprising instructions to cause an evolved Node B (eNB), upon execution of the instructions by processing circuitry of the eNB, to:
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select first and second user equipments (UEs) for device-to-device (D2D) communications; allocate a D2D time-frequency resource for the first UE to transmit to the second UE; assign the allocated D2D resource as a physical uplink shared channel (PUSCH) resource to the first UE; assign the allocated D2D resource as a physical downlink shared channel (PDSCH) resource to the second UE; receive a hybrid automatic repeat request (HARQ) aCK/NACK (positive or negative acknowledgement) from the second UE over the physical uplink control channel (PUCCH) in response to data transmitted to the second UE from the first UE over the allocated D2D resource; receive and decode the data transmitted to the second UE from the first UE over the first UE'"'"'s PUSCH; if the data received from the fist UE is decoded correctly by the eNB and an ACK is received from the second UE, send an ACK to the first UE; and
,if either the data received from the first UE is decoded incorrectly by the eNB or a NACK is received from the second UE, send a NACK to the first UE. - View Dependent Claims (18, 19, 20)
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Specification