User equipment-coordination set hybrid automatic repeat request
Techniques and apparatuses are described for user equipment-coordination set, UECS, hybrid automatic repeat request, HARQ, that establish a HARQ timeline that is specific to the capabilities of a respective UECS. Compared to a single user equipment, UE, the HARQ timeline for a UECS depends on a number of factors, such as the joint processing capability in the UECS, latency of communication over a local wireless network between the UEs in the UECS, or the like. Based on its capabilities, the UECS can request uplink and/or downlink processing delay times or a UECS-specific HARQ timeline from a base station. The base station grants the uplink and/or downlink processing delay times or the UECS-specific HARQ timeline to the UECS in a layer-1, layer-2, or a layer-3 control message. The use of a UECS-specific HARQ timeline increases the reliability of HARQ signaling for uplink and downlink communication between the UECS and a base station.
1. A method for reporting hybrid automatic repeat request (HARQ) capabilities by a user equipment (UE) configured as a coordinating user equipment for a user equipment-coordination set (UECS) in a wireless communications network, the method comprising the coordinating user equipment:
receiving, from each of multiple user equipments in the UECS, a respective UE capability report message;
consolidating the received UE capability report messages and capabilities of the coordinating user equipment to generate a UECS capability report message including capability information based on HARQ capabilities of the multiple UEs within the UECS;
encoding the generated UECS capability report message to produce I/Q samples for a joint-transmission of the UECS capability report message to a base station;
forwarding the I/Q samples to the multiple user equipments for directing the multiple user equipments to jointly transmit the encoded UECS capability report message;
jointly transmitting the UECS capability report message to a base station with at least one other user equipment of the UECS; and
receiving, from the base station, a HARQ configuration message based on the UECS capability report message.
2. The method of claim 1 , wherein the UECS capability report message includes an indication of a downlink HARQ feedback timing gap for the acknowledgement of jointly-received downlink communications, the method further comprising the coordinating user equipment:
receiving, from the base station, a resource grant for joint-transmission of HARQ feedback for the UECS; and
scheduling the joint-transmission of the HARQ feedback for the UECS based on the resource grant.
3. The method of claim 2 , wherein the UECS capability report message includes an indication of an uplink data timing for the joint-transmission of uplink data after a grant for transmission of the uplink data, the method further comprising the coordinating user equipment:
receiving an uplink grant from the base station; and
scheduling joint-transmission of the uplink data using the uplink grant and at the uplink data timing after the receiving the uplink grant.
4. The method of claim 1 , wherein the receiving the UE capability report messages comprises the coordinating user equipment:
receiving the UE capability report messages using a local wireless network.
5. The method of claim 1 , wherein the UE capability report message from each of the multiple user equipments comprises an indication of processing resources of the respective UE, an indication of remaining battery capacity of the respective UE, or both.
6. The method of claim 1 , wherein the UECS capability report message comprises one of more of: an indication of a number of simultaneous HARQ processes that the UECS can support, an indication of one or more HARQ feedback timing gaps for the UECS, or an indication of an uplink data timing.
7. A user equipment comprising:
a wireless transceiver;
a local wireless network transceiver;
a processor; and
instructions for a communication manager application that are executable by the processor to configure the user equipment to:
receive, using the local wireless network transceiver and from each of multiple user equipments in a user equipment-coordination set (UECS), a respective user equipment (UE) capability report message;
consolidate the received UE capability report messages and capabilities of the coordinating user equipment to generate a UECS capability report message including capability information based on HARQ capabilities of the multiple UEs within the UECS;
encode the generated UECS capability report message to produce I/Q samples for a joint-transmission of the UECS capability report message to a base station;
forward the I/Q samples to the multiple user equipments for directing the multiple user equipments to jointly transmit the encoded UECS capability report message;
jointly transmit, using the wireless transceiver, the UECS capability report message to a base station with at least one other user equipment of the UECS; and
receive, using the wireless transceiver and from the base station, a hybrid automatic repeat request (HARQ) configuration message based on the UECS capability report message.
8. The user equipment of claim 7 , wherein the UECS capability report message includes an indication of a downlink HARQ feedback timing gap for the acknowledgement of jointly-received downlink communications, the instructions further executable to configure the user equipment to:
receive, from the base station, a resource grant for joint-transmission of HARQ feedback for the UECS; and
schedule the joint-transmission of the HARQ feedback for the UECS based on the resource grant.
9. The user equipment of claim 8 , wherein the UECS capability report message includes an indication of an uplink data timing for the joint-transmission of uplink data after a grant for transmission of the uplink data, the instructions further executable to configure the user equipment to:
receive an uplink grant from the base station; and
schedule joint-transmission of the uplink data using the uplink grant and at the uplink data timing after the receiving the uplink grant.
10. The user equipment of claim 7 , the instructions further executable to configure the user equipment to:
encode the generated UECS capability report message to produce I/Q samples for a joint-transmission of the UECS capability report message to the base station; and
forward the I/Q samples to the multiple user equipments for directing the multiple user equipments to jointly transmit the encoded UECS capability report message.
11. The user equipment of claim 7 , wherein the instructions to receive the UE capability report messages further configure the user equipment to:
receive the UE capability report messages using a local wireless network.
12. A method for configuring hybrid automatic repeat request (HARQ) capabilities, by a base station, for a user equipment- coordination set (UECS) in a wireless communications network, the method comprising the base station:
receiving, via a joint transmission from multiple user equipments (UEs) within the UECS, a UECS capability report message, the UECS capability report message including capability information based on HARQ capabilities of the multiple UEs ( 110 ) within the UECS;
determining a HARQ configuration for the UECS based on the received UECS capability report message; and
transmitting a HARQ configuration message to the UECS, the HARQ configuration message directing at least a coordinating user equipment (UE) of the UECS to configure the UECS for communication with the base station.
13. The method of claim 12 , wherein the UECS capability report message includes an indication of a downlink HARQ feedback timing gap for the acknowledgement of jointly received downlink communications, the method further comprising the base station:
based on the indication of a downlink HARQ feedback timing gap, determining resources for joint-transmission of HARQ feedback by the UECS; and
wherein the transmitting the HARQ configuration message to the UECS further comprises:
transmitting a resource grant that includes an indication of the determined resources to the UECS that directs the coordinating UE to schedule joint-transmission of the HARQ feedback for the UECS based on the resource grant.
14. The method of claim 13 , wherein the UECS capability report message includes an indication of an uplink data timing for the joint-transmission of uplink data after a grant for transmission of the uplink data, the method further comprising the base station:
based on the indication of an uplink data timing, determining resources for an uplink grant for the UECS; and
wherein the transmitting the HARQ configuration message to the UECS further comprises:
transmitting an uplink resource grant that includes an indication of the determined resources for the uplink grant to the UECS that directs the coordinating UE to schedule joint-transmission of uplink data based on the uplink resource grant.
15. The method of claim 12 , wherein the HARQ configuration message includes a number of simultaneous HARQ processes.
16. A base station comprising:
a wireless transceiver;
a processor; and
instructions for a base station manager application that are executable by the processor to configure the base station to:
receive, using the wireless transceiver and via a joint transmission from multiple user equipments (UEs) within a user equipment-coordination set (UECS), a UECS capability report message, the UECS capability report message including capability information based on HARQ capabilities of the multiple UEs within the UECS;
determine a HARQ configuration for the UECS based on the received UECS capability report message; and
transmit, using the wireless transceiver, a HARQ configuration message to the UECS, the HARQ configuration message directing at least a coordinating user equipment (UE) of the UECS to configure the UECS for communication with the base station.
17. The base station of claim 16 , wherein the UECS capability report message includes an indication of a downlink HARQ feedback timing gap for the acknowledgement of jointly received downlink communications, the instructions further executable to configure the base station to:
based on the indication of a downlink HARQ feedback timing gap, determine resources for joint-transmission of HARQ feedback by the UECS; and
wherein the instruction to transmit the HARQ configuration message to the UECS configure the base station to:
transmit a resource grant that includes an indication of the determined resources to the UECS that directs the coordinating UE to schedule joint-transmission of the HARQ feedback for the UECS based on the resource grant.
18. The base station of claim 17 , wherein the UECS capability report message includes an indication of an uplink data timing for the joint-transmission of uplink data after a grant for transmission of the uplink data, the instructions further executable to configure the base station to:
based on the indication of an uplink data timing, determine resources for an uplink grant for the UECS; and
wherein the instruction to transmit the HARQ configuration message to the UECS configure the base station to:
transmit an uplink resource grant that includes an indication of the determined resources for the uplink grant to the UECS that directs the coordinating UE to schedule joint-transmission of uplink data based on the uplink resource grant.