Acknowledgement bundling in a MIMO communication system
A method of wireless communication comprises receiving a plurality of codewords and transmitting a downlink feedback message by spatially bundling acknowledgments for the received plurality of codewords. In some designs, an accompanying grant message is transmitted with the downlink feedback message.
1. A wireless communication method, comprising:
receiving a plurality of codewords;
transmitting a downlink feedback message by spatially bundling acknowledgments for the received plurality of codewords in a plurality of Physical Hybrid Automatic Repeat Request (ARQ) Indicator Channels (PHICH); and
transmitting configuration data in a Physical Downlink Control Channel (PDCCH) accompanying the downlink feedback message in the PHICH to configure a wireless terminal to provide an uplink feedback response, wherein, based on the configuration data including information related to a downlink control information format for signaling in the PDCCH, one of: the signaling in the PDCCH overrides any settings conveyed by the PHICH when the signaling in the PDCCH uses a large payload downlink control information format, or the signaling in the PDCCH is interpreted using the downlink feedback message in the PHICH when the signaling in the PDCCH uses a compact payload downlink control information format, wherein the signaling in the PDCCH is interpreted to configure the wireless terminal to operate in a single antenna mode when the downlink feedback message in the PHICH acknowledges the plurality of codewords are received.
2. The method of claim 1 , further including:
transmitting an accompanying uplink grant message.
3. The method of claim 2 , wherein the uplink grant message includes a multi-input-multi-output (MIMO) downlink control information (DCI) message.
4. The method of claim 2 , wherein the uplink grant message includes a single transport block (TB) grant downlink control information (DCI) message.
5. A wireless communication apparatus, comprising:
means for receiving a plurality of codewords;
means for transmitting a downlink feedback message by spatially bundling acknowledgments for the received plurality of codewords in a plurality of Physical Hybrid Automatic Repeat Request (ARQ) Indicator Channels (PHICH); and
means for transmitting configuration data in a Physical Downlink Control Channel (PDCCH) accompanying the downlink feedback message in the PHICH to configure a wireless terminal to provide an uplink feedback response, wherein, based on the configuration data including information related to a downlink control information format for signaling in the PDCCH, one of: the signaling in the PDCCH overrides any settings conveyed by the PHICH when the signaling in the PDCCH uses a large payload downlink control information format, or the signaling in the PDCCH is interpreted using the downlink feedback message in the PHICH when the signaling in the PDCCH uses a compact payload downlink control information format, wherein the signaling in the PDCCH is interpreted to configure the wireless terminal to operate in a single antenna mode when the downlink feedback message in the PHICH acknowledges the plurality of codewords are received.
6. The apparatus of claim 5 , further including:
means for transmitting an accompanying uplink grant message.
7. The apparatus of claim 6 , wherein the uplink grant message includes a multi-input-multi-output (MIMO) downlink control information (DCI) message.
8. The apparatus of claim 6 , wherein the uplink grant message includes a single transport block (TB) grant downlink control information (DCI) message.
9. A non-transitory computer-readable, non-volatile storage medium storing computer-executable instructions, the instructions comprising code for:
receiving a plurality of codewords;
transmitting a downlink feedback message by spatially bundling acknowledgments for the received plurality of codewords in a plurality of Physical Hybrid Automatic Repeat Request (ARQ) Indicator Channels (PHICH); and
transmitting configuration data in a Physical Downlink Control Channel (PDCCH) accompanying the downlink feedback message in the PHICH to configure a wireless terminal to provide an uplink feedback response, wherein, based on the configuration data including information related to a downlink control information format for signaling in the PDCCH, one of: the signaling in the PDCCH overrides any settings conveyed by the PHICH when the signaling in the PDCCH uses a large payload downlink control information format, or the signaling in the PDCCH is interpreted using the downlink feedback message in the PHICH when the signaling in the PDCCH uses a compact payload downlink control information format, wherein the signaling in the PDCCH is interpreted to configure the wireless terminal to operate in a single antenna mode when the downlink feedback message in the PHICH acknowledges the plurality of codewords are received.
10. An apparatus for wireless communication, comprising:
a memory; and
a processor coupled to the memory and configured to:
receive a plurality of codewords;
transmit a downlink feedback message by spatially bundling acknowledgments for the received plurality of codewords in a plurality of Physical Hybrid Automatic Repeat Request (ARQ) Indicator Channels (PHICH); and
transmit configuration data in a Physical Downlink Control Channel (PDCCH) accompanying the downlink feedback message in the PHICH to configure a wireless terminal to provide an uplink feedback response, wherein, based on the configuration data including information related to a downlink control information format for signaling in the PDCCH, one of: the signaling in the PDCCH overrides any settings conveyed by the PHICH when the signaling in the PDCCH uses a large payload downlink control information format, or the signaling in the PDCCH is interpreted using the downlink feedback message in the PHICH when the signaling in the PDCCH uses a compact payload downlink control information format, wherein the signaling in the PDCCH is interpreted to configure the wireless terminal to operate in a single antenna mode when the downlink feedback message in the PHICH acknowledges the plurality of codewords are received.
11. A wireless communication method, comprising:
transmitting a plurality of codewords;
receiving a downlink feedback message including spatially bundled acknowledgments for the transmitted plurality of codewords in a plurality of Physical Hybrid Automatic Repeat Request (ARQ) Indicator Channels (PHICH); and
receiving configuration data in a Physical Downlink Control Channel (PDCCH) accompanying the downlink feedback message in the PHICH to provide an uplink feedback response, wherein, based on the configuration data including information related to a downlink control information format for signaling in the PDCCH, one of: the signaling in the PDCCH overrides any settings conveyed by the PHICH when the signaling in the PDCCH uses a large payload downlink control information format, or the signaling in the PDCCH is interpreted using the downlink feedback message in the PHICH when the signaling in the PDCCH uses a compact payload downlink control information format, wherein the signaling in the PDCCH is interpreted to enable a single antenna mode when the downlink feedback message in the PHICH acknowledges the plurality of codewords are received.
12. The method of claim 11 , further including:
determining whether or not to retransmit at least one of the plurality of codewords based on the received downlink feedback message.
13. The method of claim 11 , further including:
receiving an accompanying uplink grant message.
14. The method of claim 13 , wherein the uplink grant message includes a multi-input-multi-output (MIMO) downlink control information (DCI) message.
15. The method of claim 13 , wherein the uplink grant message includes a single transport block (TB) grant downlink control information (DCI) message.
16. The method of claim 15 , further including:
retransmitting, when one of the spatially bundled acknowledgements includes a NAK, a corresponding codeword using a transmission format indicated in the received uplink grant message.
17. The method of claim 11 , further including:
determining whether or not to retransmit at least one of the plurality of codewords based on the received downlink feedback message.
18. The method of claim 13 , wherein the uplink grant message includes a multi-input-multi-output (MIMO) downlink control information (DCI) message.
19. The method of claim 13 , wherein the uplink grant message includes a single transport block (TB) grant downlink control information (DCI) message.
20. The method of claim 19 , further including:
retransmitting, when one of the spatially bundled acknowledgements includes a NAK, a corresponding codeword using a transmission format indicated in the received uplink grant message.
21. A wireless communication apparatus, comprising:
means for transmitting a plurality of codewords;
means for receiving a downlink feedback message including spatially bundled acknowledgments for the transmitted plurality of codewords in a plurality of Physical Hybrid Automatic Repeat Request (ARQ) Indicator Channels (PHICH); and
means for receiving configuration data in a Physical Downlink Control Channel (PDCCH) accompanying the downlink feedback message in the PHICH to provide an uplink feedback response, wherein, based on the configuration data including information related to a downlink control information format for signaling in the PDCCH, one of: the signaling in the PDCCH overrides any settings conveyed by the PHICH when the signaling in the PDCCH uses a large payload downlink control information format, or the signaling in the PDCCH is interpreted using the downlink feedback message in the PHICH when the signaling in the PDCCH uses a compact payload downlink control information format, wherein the signaling in the PDCCH is interpreted to enable a single antenna mode when the downlink feedback message in the PHICH acknowledges the plurality of codewords are received.
22. The apparatus of claim 21 , further including:
means for receiving an accompanying uplink grant message.
23. The apparatus of claim 22 , wherein the uplink grant message includes a multi-input-multi-output (MIMO) downlink control information (DCI) message.
24. The apparatus of claim 22 , wherein the uplink grant message includes a single transport block (TB) grant downlink control information (DCI) message.
25. The apparatus of claim 24 , further including:
means for retransmitting, when one of the spatially bundled acknowledgements includes a NAK, a corresponding codeword using a transmission format indicated in the received uplink grant message.
26. The apparatus of claim 21 , further including:
means for determining whether or not to retransmit at least one of the plurality of codewords based on the received downlink feedback message.
27. The apparatus of claim 22 , further including:
means for receiving an accompanying uplink grant message.
28. The apparatus of claim 27 , wherein the uplink grant message includes a multi-input-multi-output (MIMO) downlink control information (DCI) message.
29. The apparatus of claim 27 , wherein the uplink grant message includes a single transport block (TB) grant downlink control information (DCI) message.
30. The apparatus of claim 29 , further including:
means for retransmitting, when one of the spatially bundled acknowledgements includes a NAK, a corresponding codeword using a transmission format indicated in the received uplink grant message.
31. A non-transitory computer-readable, non-volatile storage medium storing computer-executable instructions, the instructions comprising code for:
transmitting a plurality of codewords;
receiving a downlink feedback message including spatially bundled acknowledgments for the transmitted plurality of codewords in a plurality of Physical Hybrid Automatic Repeat Request (ARQ) Indicator Channels (PHICH); and
receiving configuration data in a Physical Downlink Control Channel (PDCCH) accompanying the downlink feedback message in the PHICH to provide an uplink feedback response, wherein, based on the configuration data including information related to a downlink control information format for signaling in the PDCCH, one of: the signaling in the PDCCH overrides any settings conveyed by the PHICH when the signaling in the PDCCH uses a large payload downlink control information format, or the signaling in the PDCCH is interpreted using the downlink feedback message in the PHICH when the signaling in the PDCCH uses a compact payload downlink control information format, wherein the signaling in the PDCCH is interpreted to enable a single antenna mode when the downlink feedback message in the PHICH acknowledges the plurality of codewords are received.
32. An apparatus for wireless communication, comprising:
a memory; and
a processor coupled to the memory and configured to:
transmit a plurality of codewords;
receive a downlink feedback message including spatially bundled acknowledgments for the transmitted plurality of codewords in a plurality of Physical Hybrid Automatic Repeat Request (ARQ) Indicator Channels (PHICH); and
receive configuration data in a Physical Downlink Control Channel (PDCCH) accompanying the downlink feedback message in the PHICH to provide an uplink feedback response, wherein, based on the configuration data including information related to a downlink control information format for signaling in the PDCCH, one of: the signaling in the PDCCH overrides any settings conveyed by the PHICH when the signaling in the PDCCH uses a large payload downlink control information format, or the signaling in the PDCCH is interpreted using the downlink feedback message in the PHICH when the signaling in the PDCCH uses a compact payload downlink control information format, wherein the signaling in the PDCCH is interpreted to enable a single antenna mode when the downlink feedback message in the PHICH acknowledges the plurality of codewords are received.