Resource allocation for the physical uplink control channel
Aspects of the disclosure relate to allocating resources for a physical uplink control channel (PUCCH). In a first example, a subset of a resource set corresponding to a PUCCH is identified based on an explicit mapping of acknowledgment resource indicator (ARI) values, and a resource index corresponding to a resource within the subset is derived based on an implicit mapping of the resource index. A PUCCH communication is then transmitted via the resource. In another example, a user equipment (UE) is configured to ascertain resources for a PUCCH in accordance with an explicit mapping of ARI values and an implicit mapping of a resource index such that the explicit mapping facilitates an identification of a subset of a resource set, whereas the implicit mapping facilitates a derivation of the resource index to identify a corresponding resource within the subset.
1. A method of wireless communication performed by a user equipment (UE), comprising:
receiving, from a base station, a remaining minimum system information (RMSI) value;
receiving, from the base station, downlink control information (DCI) that indicates a control channel element (CCE) index and an acknowledgment resource indicator (ARI) value;
determining a set of resource block (RB) indices and a set of cyclic shift indices based on the RMSI value;
determining a physical uplink control channel (PUCCH) resource for transmitting a PUCCH communication, the determination including determining an RB index from the set of RB indices and a cyclic shift index from the set of cyclic shift indices based on the ARI value and the indication of the CCE index;
transmitting, to the base station, a PUCCH communication via the determined PUCCH resource.
2. The method of claim 1 , wherein the determination of the PUCCH resource is performed prior to establishing a radio resource control (RRC) connection with the base station.
3. The method of claim 1 , further comprising using a fixed orthogonal cover code (OCC) with the determined PUCCH resource.
4. The method of claim 1 , wherein the determination of the RB index is further associated with a duration or a frequency hop.
5. A user equipment (UE), comprising:
a processor; and
a memory storing code that, when executed by the processor, is configured to cause the processor to:
receive, from a base station, a remaining minimum system information (RMSI) value;
receive, from the base station, downlink control information (DCI) that indicates a control channel element (CCE) index and an acknowledgment resource indicator (ARI) value;
determine a set of resource block (RB) indices and a set of cyclic shift indices based on the RMSI value;
determine a physical uplink control channel (PUCCH) resource for transmitting a PUCCH communication, the determination including determining an RB index from the set of RB indices and a cyclic shift index from the set of cyclic shift indices based on the ARI value and the indication of the CCE index;
transmit, to the base station, a PUCCH communication via the determined PUCCH resource.
6. The UE of claim 5 , wherein the determination of the PUCCH resource is performed prior to establishing a radio resource control (RRC) connection with the base station.
7. The UE of claim 5 , wherein the code, when executed by the processor, is further configured to cause the processor to use a fixed orthogonal cover code (OCC) with the determined PUCCH resource.
8. The UE of claim 5 , wherein the determination of the RB index is further associated with a duration or a frequency hop.
9. A method of wireless communication performed by a base station, comprising:
transmitting a remaining minimum system information (RMSI) value, the RMSI value indicating, to one or more user equipment (UEs), a set of resource block (RB) indices and a set of cyclic shift indices associated with the RMSI value for transmitting physical uplink control channel (PUCCH) communications;
transmitting downlink control information (DCI) that indicates a control channel element (CCE) index and an acknowledgment resource indicator (ARI) value, the CCE index and the ARI value indicating, to at least one of the one or more UEs, an RB index from the set of RB indices and a cyclic shift index from the set of cyclic shift indices associated with a PUCCH resource for transmitting a PUCCH communication; and
receiving, from the at least one UE, the PUCCH communication via the PUCCH resource.
10. The method of claim 9 , wherein the transmission of the RMSI value and the DCI is performed prior to establishing a radio resource control (RRC) connection with the at least one UE.
11. The method of claim 9 , further comprising using a fixed orthogonal cover code (OCC) with the PUCCH resource.
12. The method of claim 9 , wherein the RB index is further associated with a duration or a frequency hop.
13. A base station, comprising:
a processor; and
a memory storing code that, when executed by the processor, is configured to cause the processor to:
transmit a remaining minimum system information (RMSI) value, the RMSI value indicating, to one or more user equipment (UEs), a set of resource block (RB) indices and a set of cyclic shift indices associated with the RMSI value for transmitting physical uplink control channel (PUCCH) communications;
transmit downlink control information (DCI) that indicates a control channel element (CCE) index and an acknowledgment resource indicator (ARI) value, the CCE index and the ARI value indicating, to at least one of the one or more UEs, an RB index from the set of RB indices and a cyclic shift index from the set of cyclic shift indices associated with a PUCCH resource for transmitting a PUCCH communication; and
receive, from the at least one UE, the PUCCH communication via the PUCCH resource.
14. The base station of claim 13 , wherein the transmission of the RMSI value and the DCI is performed prior to establishing a radio resource control (RRC) connection with the at least one UE.
15. The base station of claim 13 , wherein the code, when executed by the processor, is further configured to cause the processor to use a fixed orthogonal cover code (OCC) with the PUCCH resource.
16. The base station of claim 13 , wherein the RB index is further associated with a duration or a frequency hop.