Uplink control channel resource allocation for an enhanced downlink control channel of a mobile communication system
Uplink control channel resource allocation for an enhanced downlink control channel is disclosed. A first example method disclosed herein includes receiving, at a user equipment (UE), a downlink control channel carrying a physical uplink control channel (PUCCH) resource indicator, mapping the PUCCH resource indicator to a first offset, mapping a position of the downlink control channel to a second offset, and mapping a linear combination of the first and second offsets to an index identifying a first PUCCH resource. A second example method disclosed herein includes, in response to receiving, at a UE, an indication of a dynamic resource offset in an enhanced physical downlink control channel (ePDCCH) transmitted in a first ePDCCH set, determining a position of the ePDCCH and a subframe offset, and processing the indication of the dynamic resource offset, the position and the subframe offset to determine an allocated uplink control channel resource for the UE.
1. One or more non-transitory computer-readable media storing instructions that are operable when executed by one or more hardware processors, cause a computing device to perform operations comprising:
receiving a downlink control channel carrying a physical uplink control channel (PUCCH) resource indicator, wherein the downlink control channel is associated with a demodulation reference signal (DMRS) antenna port;
mapping the PUCCH resource indicator to a first offset;
determining a second offset based on a position of the received downlink control channel normalized by a first value;
determining an index of the DMRS antenna port associated with the downlink control channel;
determining a third offset based on the determined index of the DMRS antenna port;
mapping a linear combination of the first, second, and third offsets to an index identifying a first allocated PUCCH resource; and
transmitting a PUCCH on the first allocated PUCCH resource.
2. The one or more non-transitory computer-readable media of claim 1 , wherein the operations comprise receiving a plurality of physical downlink shared channels (PDSCHs), respective ones of the PDSCHs being received in respective different subframes, and wherein the mapping of the linear combination comprises adding a first subframe offset corresponding to a first subframe in which a first one of the PDSCHs was received.
3. The one or more non-transitory computer-readable media of claim 1 , the operations further comprising:
determining a second allocated PUCCH resource, the second allocated PUCCH resource having a value equal to the first allocated PUCCH resource plus a constant; and
transmitting a PUCCH on one of the first or the second allocated PUCCH resources using a first antenna port.
4. The one or more non-transitory computer-readable media of claim 1 , the operations further comprising:
determining a second allocated PUCCH resource, the second allocated PUCCH resource having a value equal to the first allocated PUCCH resource plus a constant; and
transmitting the PUCCH on the first allocated PUCCH resource using a first antenna port and on the second allocated PUCCH resource using a second antenna port, the PUCCH being transmitted simultaneously on the first and second antenna ports.
5. The one or more non-transitory computer-readable media of claim 1 , wherein the downlink control channel is in a downlink control information (DCI) format.
6. The one or more non-transitory computer-readable media of claim 1 , the operations further comprising:
determining a fourth offset based on a transmission mode of the downlink control channel, wherein the transmission mode is one of localized transmission or distributed transmission; and
mapping a linear combination of the first, second, third, and fourth offsets to the index identifying the first allocated PUCCH resource.
7. The one or more non-transitory computer-readable media of claim 1 , wherein the first value is a number of enhanced control channel elements (eCCEs).
8. The one or more non-transitory computer-readable media of claim 7 , wherein determining the second offset comprises determining the largest integer that is smaller than or equal to the position of the received downlink control channel normalized by the first value.
9. The one or more non-transitory computer-readable media of claim 1 , wherein the first value is a length of enhanced physical downlink control channel (ePDCCH).
10. An access node, comprising:
at least one hardware processor; and
a non-transitory computer-readable storage medium coupled to the at least one hardware processor and storing programming instructions for execution by the at least one hardware processor, wherein the programming instructions, when executed, cause the access node to perform operations comprising:
transmitting, to a user equipment (UE), a downlink control channel carrying a PUCCH resource indicator, wherein the downlink control channel is transmitted using a demodulation reference signal (DMRS) antenna port;
mapping the PUCCH resource indicator to a first offset;
determining a second offset based on a position of the transmitted downlink control channel normalized by a first value;
determining a third offset based on an index of the DMRS antenna port used to transmit the downlink control channel;
mapping a linear combination of the first, second, and third offsets to an index identifying a first allocated PUCCH resource; and
receiving a PUCCH on the first allocated PUCCH resource.
11. The access node of claim 10 , wherein a plurality of physical downlink shared channels (PDSCHs) are to be transmitted to the UE, respective ones of the PDSCHs being transmitted in respective different subframes, and wherein the mapping of the linear combination comprises adding a first subframe offset corresponding to a first subframe in which a first one of the PDSCHs is to be transmitted.
12. The access node of claim 10 , the operations further comprising:
determining a second allocated PUCCH resource, the second allocated PUCCH resource having a value equal to the first allocated PUCCH resource plus a constant; and
receiving a PUCCH on one of the first or the second allocated PUCCH resources using a first antenna port.
13. The access node of claim 10 , the operations further comprising:
determining a second allocated PUCCH resource, the second allocated PUCCH resource having a value equal to the first allocated PUCCH resource plus a constant; and
receiving the PUCCH on the first allocated PUCCH resource using a first antenna port and on the second allocated PUCCH resource using a second antenna port, the PUCCH being received simultaneously on the first and second antenna ports.
14. The access node of claim 10 , wherein the downlink control channel is in a downlink control information (DCI) format.
15. The access node of claim 10 , the operations further comprising:
determining a fourth offset based on a transmission mode of the downlink control channel, wherein the transmission mode is one of localized transmission or distributed transmission; and
mapping a linear combination of the first, second, third, and fourth offsets to the index identifying the first allocated PUCCH resource.
16. The access node of claim 10 , wherein the first value is a number of enhanced control channel elements (eCCEs).
17. The access node of claim 16 , wherein determining the second offset comprises determining the largest integer that is smaller than or equal to the position of the transmitted downlink control channel normalized by the first value.
18. The access node of claim 10 , wherein the first value is a length of enhanced physical downlink control channel (ePDCCH).
19. One or more non-transitory computer-readable media storing instructions that are operable when executed by one or more hardware processors, cause a computing device to perform operations comprising:
transmitting, to a user equipment (UE), a downlink control channel carrying a PUCCH resource indicator, wherein the downlink control channel is transmitted using a demodulation reference signal (DMRS) antenna port;
mapping the PUCCH resource indicator to a first offset;
determining a second offset based on a position of the transmitted downlink control channel normalized by a first value;
determining a third offset based on an index of the DMRS antenna port used to transmit the downlink control channel;
mapping a linear combination of the first, second, and third offsets to an index identifying a first allocated PUCCH resource; and
receiving a PUCCH on the first allocated PUCCH resource.
20. The one or more non-transitory computer-readable media of claim 19 , wherein a plurality of physical downlink shared channels (PDSCHs) are to be transmitted to the UE, respective ones of the PDSCHs being transmitted in respective different subframes, and wherein the mapping of the linear combination comprises adding a first subframe offset corresponding to a first subframe in which a first one of the PDSCHs is to be transmitted.