HARQ-aware CQI reporting
View Patent ↗The invention provides a method or system where the UE sends the CQI to the base station (Node B) based on whether a HARQ retransmission is expected. For example, if a HARQ retransmission is expected, then the UE can reduce the CQI information to sending less (or no) bits in the uplink. In effect, the UE will automatically stop sending CQIs to the base station (Node B) for time-periods where it is known that HARQ retransmissions will be scheduled. The method or system may include one or more steps or elements for implementing this functionality in the UE.
1. A method comprising:
receiving a hybrid automatic repeat request retransmission that is scheduled in a downlink; and
selectively sending a channel quality indicator based on whether the hybrid automatic repeat request retransmission is expected,
wherein for the case of an adaptive hybrid automatic repeat request retransmission where a base station packet scheduler has the flexibility to schedule pending hybrid automatic repeat request retransmissions on different resource blocks than the resource blocks used during an original transmission, channel quality indicator feedback from user equipment can be optimized so the user equipment only signals an index of the N best resource blocks.
2. A method according to claim 1 , wherein in the case of a synchronous hybrid automatic repeat request retransmission both a base station and a user terminal know when a pending hybrid automatic repeat request retransmission will be transmitted in the downlink.
3. A method according to claim 1 , wherein for the case where the hybrid automatic repeat request retransmission is sent on the same resource blocks as an original transmission, there is no need for the channel quality indicator at a base station.
4. A method according to claim 1 , wherein user equipment automatically stops sending the channel quality indicator for time periods where it is known that hybrid automatic repeat request retransmissions will be scheduled.
5. A method according to claim 1 , wherein the N best resource blocks have the highest signal-to-noise ratio.
6. A system comprising:
a network element having
one or more modules configured to receive a hybrid automatic repeat request retransmission that is scheduled in a downlink; and
one or more modules configured to selectively send a channel quality indicator based on whether the hybrid automatic repeat request retransmission is expected,
wherein for the case of an adaptive hybrid automatic repeat request retransmission where a base station packet scheduler has the flexibility to schedule pending hybrid automatic repeat request retransmissions on different resource blocks than the resource blocks used during an original transmission, channel quality indicator feedback from user equipment can be optimized so the user equipment only signals an index of the N best resource blocks.
7. A system according to claim 6 , wherein in the case of a synchronous hybrid automatic repeat request retransmission both a base station and a user terminal know when a pending hybrid automatic repeat request retransmission will be transmitted in the downlink.
8. A system according to claim 6 , wherein for the case where the hybrid automatic repeat request retransmission is sent on the same resource blocks as an original transmission, there is no need for the channel quality indicator at a base station.
9. A system according to claim 6 , wherein user equipment automatically stops sending the channel quality indicator for time periods where it is known that hybrid automatic repeat request retransmissions will be scheduled.
10. A system according to claim 6 , wherein the N best resource blocks have the highest signal-to-noise ratio.
11. User equipment comprising:
one or more modules configured to receive a hybrid automatic repeat request retransmission that is scheduled in a downlink; and
one or more modules configured to selectively send a channel quality indicator based on whether the hybrid automatic repeat request retransmission is expected,
wherein for the case of an adaptive hybrid automatic repeat request retransmission where a base station packet scheduler has the flexibility to schedule pending hybrid automatic repeat request retransmissions on different resource blocks than the resource blocks used during an original transmission, channel quality indicator feedback from the user equipment can be optimized so the user equipment only signals an index of the N best resource blocks.
12. User equipment according to claim 11 , wherein in the case of a synchronous hybrid automatic repeat request retransmission both a base station and the user terminal know when a pending hybrid automatic repeat request retransmission will be transmitted in the downlink.
13. User equipment according to claim 11 , wherein for the case where the hybrid automatic repeat request retransmission is sent on the same resource blocks as an original transmission, there is no need for the channel quality indicator at a base station.
14. User equipment according to claim 11 , wherein the user equipment automatically stops sending the channel quality indicator for time periods where it is known that hybrid automatic repeat request retransmissions will be scheduled.
15. User equipment according to claim 11 , wherein the N best resource blocks have the highest signal-to-noise ratio.
16. A network element comprising:
one or more modules configured to receive a hybrid automatic repeat request retransmission that is scheduled in a downlink; and
one or more modules configured to receive a channel quality indicator that is selectively sent based on whether the hybrid automatic repeat request retransmission is expected by user equipment,
wherein for the case of an adaptive hybrid automatic repeat request retransmission where a base station packet scheduler has the flexibility to schedule pending hybrid automatic repeat request retransmissions on different resource blocks than the resource blocks used during an original transmission, channel quality indicator feedback from user equipment can be optimized so the user equipment only signals an index of the N best resource blocks.
17. A network element according to claim 16 , wherein in the case of a synchronous hybrid automatic repeat request retransmission both a base station and the user terminal know when a pending hybrid automatic repeat request retransmission will be transmitted in the downlink.
18. A network element according to claim 16 , wherein for the case where the hybrid automatic repeat request retransmission is sent on the same resource blocks as an original transmission, there is no need for the channel quality indicator at a base station.
19. A network element according to claim 16 , wherein user equipment automatically stops sending the channel quality indicator for time periods where it is known that hybrid automatic repeat request retransmissions will be scheduled.
20. A network element according to claim 16 , wherein the N best resource blocks have the highest signal-to-noise ratio.
21. A chipset comprising:
one or more chipset modules configured to receive a hybrid automatic repeat request retransmission that is scheduled in a downlink; and
one or more chipset modules configured to selectively send a channel quality indicator based on whether the hybrid automatic repeat request retransmission is expected,
wherein for the case of an adaptive hybrid automatic repeat request retransmission where a base station packet scheduler has the flexibility to schedule pending hybrid automatic repeat request retransmissions on different resource blocks than the resource blocks used during an original transmission, channel quality indicator feedback from the user equipment can be optimized so the user equipment only signals an index of the N best resource blocks.
22. A chipset according to claim 21 , wherein in the case of a synchronous hybrid automatic repeat request retransmission both a base station and the user terminal know when a pending hybrid automatic repeat request retransmission will be transmitted in the downlink.
23. A chipset according to claim 21 , wherein for the case where the hybrid automatic repeat request retransmission is sent on the same resource blocks as an original transmission, there is no need for the channel quality indicator at a base station.
24. A chipset according to claim 21 , wherein user equipment automatically stops sending the channel quality indicator for time periods where it is known that hybrid automatic repeat request retransmissions will be scheduled.
25. A chipset according to claim 21 , wherein the N best resource blocks have the highest signal-to-noise ratio.
26. An apparatus comprising:
at least one processor and at least one non-transitory computer readable medium stored with computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to:
receive a hybrid automatic repeat request retransmission that is scheduled in a downlink, and selectively send a channel quality indicator based on whether the hybrid automatic repeat request retransmission is expected,
wherein for the case of an adaptive hybrid automatic repeat request retransmission where a base station packet scheduler has the flexibility to schedule pending hybrid automatic reseat request retransmissions on different resource blocks than the resource blocks used during an original transmission, channel quality indicator feedback from the user equipment can be optimized so the user equipment only signals an index of the N best resource blocks.
27. A method according to claim 1 , wherein the method further comprises implementing the step of the method via a computer program running in a processor, controller or other suitable module in user equipment.
28. Apparatus comprising:
means for receiving a hybrid automatic repeat request retransmission that is scheduled in a downlink; and
means for selectively sending a channel quality indicator based on whether the hybrid automatic repeat request retransmission is expected,
wherein for the case of an adaptive hybrid automatic repeat request retransmission where a base station packet scheduler has the flexibility to schedule pending hybrid automatic repeat request retransmissions on different resource blocks than the resource blocks used during an original transmission channel quality indicator feedback from the user equipment can be optimized so the user equipment only signals an index of the N best resource blocks.