Method and apparatus for resource allocation for half duplex frequency division duplexing in a wireless communication system
A method and apparatus for resource allocation for half duplex frequency division duplexing in a wireless communication system is provided. Fixed or variable HARQ timing of greater than 5 subframes may be implemented. Acknowledgements for multiple downlink (uplink) transmissions can be bundled into a single acknowledgement transmitted on an uplink (downlink) control channel. Bundled acknowledgements for downlink transmissions may also be provided. Variable lead time cross subframe scheduling may be provided in which the number of subframes of delay between an uplink or downlink grant and the corresponding scheduled uplink or downlink transmission changes based on other scheduled events and/or half-duplex transceiver availability in the appropriate mode. The scheduling may select the earliest available subframe after a minimum delay. Uplink grant bundling may also be performed, in which multiple uplink grants are transmitted via a single grant indication.
1. A method for resource allocation for half duplex frequency division duplexing in a wireless communication system, the method comprising:
wirelessly receiving, by a wireless terminal, a downlink grant on a downlink control channel in a first subframe;
determining, by the wireless terminal, a second subframe following the first subframe, in which to monitor for a downlink message corresponding to the downlink grant, wherein the second subframe occurs a variable number of subframes after the first subframe and wherein the variable number is determined based on a predetermined rule set and a current schedule of transmission and reception operations of the wireless terminal, wherein the predetermined rule set at least indicates that the variable number is equal to a smallest integer n, of at least a predetermined minimum value, such that an n th subframe contiguously following the first subframe is available for use for monitoring for the downlink message; and
monitoring, by the wireless terminal, for a downlink message on a downlink shared channel during the second subframe.
2. The method of claim 1 , further comprising:
determining, by the wireless terminal, the second subframe wherein the variable number is determined based on a predetermined rule set.
3. The method of claim 2 , wherein the predetermined rule set is identified in the downlink grant.
4. The method of claim 1 , wherein the second subframe depends on whether the second subframe is available for use in monitoring for the downlink message.
5. The method of claim 4 , wherein the variable number is explicitly defined in the downlink grant.
6. The method of claim 1 , wherein the predetermined minimum value is two.
7. The method of claim 1 , wherein the variable number of subframes is explicitly defined in the downlink grant.
8. The method of claim 1 , wherein a given subframe is deemed available for use in monitoring for the downlink message when, for the given subframe, a half-duplex transceiver of the wireless device is scheduled to be in a reception mode and no other transmissions to the wireless terminal are scheduled on the downlink shared channel.
9. The method of claim 1 , further comprising maintaining the current schedule by the wireless terminal, the current schedule indicative of: scheduled downlink transmissions; scheduled uplink transmissions; scheduled switching operations between transmission and reception modes; scheduled transmissions of uplink acknowledgements; and scheduled reception of downlink acknowledgements.
10. The method of claim 1 , further comprising:
determining, by a base station transmitting the downlink grant, the second subframe by independently determining the variable number based on the predetermined rule set and a copy of the current schedule of transmission and reception operations of the wireless terminal; and
transmitting, by the base station, the downlink message on the downlink shared channel during the second subframe.
11. The method of claim 1 , wherein the downlink message is a first message of a plurality of M messages for communication in contiguous subframes, and wherein the predetermined rule set indicates that the variable number is equal to a smallest integer n, of at least a predetermined minimum value, such that a contiguous set of M subframes, beginning with an n th subframe contiguously following the first subframe, are available for use monitoring for the downlink message, based on the current schedule.
12. A wireless terminal configured to communicate using half duplex frequency division duplexing in a wireless communication system, the wireless terminal including a processor and a memory storing thereon machine executable instructions, the machine executable instructions, when executed by the processor configure the wireless terminal to:
receive a downlink grant on a downlink control channel in a first subframe;
determine a second subframe following the first subframe, in which to monitor for a downlink message corresponding to the downlink grant, wherein the variable number is determined based on a predetermined rule set and a current schedule of transmission and reception operations of the wireless terminal, wherein the second subframe occurs a variable number of subframes after the first subframe and wherein the predetermined rule set at least indicates that the variable number is equal to a smallest integer n, of at least a predetermined minimum value, such that an n th subframe contiguously following the first subframe is available for use for monitoring for a downlink message; and
monitor for a downlink message on a downlink shared channel during the second subframe.
13. The wireless terminal of claim 12 , wherein the machine executable instructions, when executed by the processor, further configure the wireless terminal to determine the second subframe wherein the variable number is determined based on a predetermined rule set.
14. The wireless terminal of claim 13 , wherein the predetermined rule set is identified in the downlink grant.
15. The wireless terminal of claim 12 , wherein the second subframe depends on whether the second subframe is available for use in monitoring for the downlink message.
16. The wireless terminal of claim 15 , wherein the variable number is explicitly defined in the downlink grant.
17. A method for resource allocation for half duplex frequency division duplexing in a wireless communication system, the method comprising:
wirelessly receiving, by a wireless terminal, an uplink grant on a downlink control channel in a first subframe;
determining, by the wireless terminal, a second subframe following the first subframe in which to transmit an uplink message corresponding to the uplink grant, the variable number determined based on a predetermined rule set and a current schedule of transmission and reception operations of the wireless terminal, wherein the second subframe occurs a variable number of subframes after the first subframe and wherein the predetermined rule set at least indicates that the variable number is equal to a smallest integer n, of at least a predetermined minimum value, such that an n th subframe contiguously following the first subframe is available for use in transmitting an uplink message; and
transmitting, by the wireless terminal, an uplink message on an uplink shared channel, during the second subframe.
18. The method of claim 17 , further comprising:
determining, by the wireless terminal, the second subframe wherein the variable number is determined based on a predetermined rule set.
19. The method of claim 18 , wherein the predetermined rule set is identified in the uplink grant.
20. The method of claim 17 , wherein the second subframe depends on whether the second subframe is available for use in transmitting for the uplink message.
21. The method of claim 20 , wherein the variable number is explicitly defined in the uplink grant.
22. The method of claim 17 , wherein a given subframe is deemed available for use in transmitting the uplink message when, for the given subframe, a half-duplex transceiver of the wireless device is scheduled to be in a transmission mode and no other transmissions by the wireless terminal are scheduled on the uplink shared channel.
23. The method of claim 17 , further comprising maintaining the current schedule by the wireless terminal, the current schedule indicative of: scheduled downlink transmissions; scheduled uplink transmissions; scheduled switching operations between transmission and reception modes; scheduled transmissions of uplink acknowledgements; and scheduled reception of downlink acknowledgements.
24. The method of claim 17 , further comprising:
determining, by a base station transmitting the uplink grant, the second subframe by independently determining the variable number based on the predetermined rule set and a copy of the current schedule of transmission and reception operations of the wireless terminal; and
receiving, by the base station, the uplink message on the uplink shared channel during the second subframe.
25. The method of claim 17 , wherein the uplink message is a first message of a plurality of M messages for communication in contiguous subframes, and wherein the predetermined rule set indicates that the variable number is equal to a smallest integer n, of at least a predetermined minimum value, such that a contiguous set of M subframes, beginning with an n th subframe contiguously following the first subframe, are available for use in transmitting the uplink message based on the current schedule.
26. The method of claim 17 , wherein the variable number of subframes is explicitly defined in the uplink grant.
27. A wireless terminal configured to communicate using half duplex frequency division duplexing in a wireless communication system, the wireless terminal including a processor and a memory storing thereon machine executable instructions, the machine executable instructions, when executed by the processor configure the wireless terminal to:
receive an uplink grant on a downlink control channel in a first subframe;
determine a second subframe following the first subframe in which to transmit an uplink message corresponding to the uplink grant, wherein the second subframe occurs a variable number of subframes after the first subframe and the variable number determined based on a predetermined rule set and a current schedule of transmission and reception operations of the wireless terminal, wherein the predetermined rule set at least indicates that the variable number is equal to a smallest integer n, of at least a predetermined minimum value, such that an n th subframe contiguously following the first subframe is available for use in transmitting an uplink message; and
transmit an uplink message on an uplink shared channel during a second subframe, wherein the second subframe occurs a variable number of subframes after the first subframe.
28. The wireless terminal of claim 27 , wherein the machine executable instructions, when executed by the processor, further configure the wireless terminal to determine the second subframe wherein the variable number is determined based on a predetermined rule set.
29. The wireless terminal of claim 28 , wherein the predetermined rule set is identified in the uplink grant.
30. The wireless terminal of claim 27 , wherein the second subframe depends on whether the second subframe is available for use in transmitting for the uplink message.
31. The wireless terminal of claim 30 , wherein the variable number is explicitly defined in the uplink grant.