Channel state information feedback methods and systems
Disclosed are methods, systems and devices for channel state information feedback to facilitate, for example, high-performance beamforming or precoding in multiple input multiple output (MIMO) systems. One example method includes performing multiple transmissions of a channel measurement report on multiple transmission occasions. Another example method includes performing multiple receptions of a channel measurement report on multiple reception occasions, where the multiple receptions at a network node correspond to multiple transmissions from a wireless device. In both exemplary methods, a timing of the multiple transmissions is based on at least one of a number of the multiple transmission occasions, a time gap between adjacent transmission occasions of the multiple transmission occasions, and one or more timeslots that include the multiple transmission occasions.
1. A method for wireless communication, implemented at a wireless node, comprising:
performing multiple transmissions of a channel measurement report on multiple transmission occasions,
wherein a timing of the multiple transmissions is based on any one or more of a number of the multiple transmission occasions, a time gap between adjacent transmission occasions of the multiple transmission occasions, and one or more timeslots comprising the multiple transmission occasions, and
wherein the one or more timeslots comprising the number of the multiple transmission occasions is determined based on a bitmap for a set of candidate timeslots.
2. The method of claim 1 , further comprising:
performing at least one of the multiple transmissions in each of the one or more timeslots.
3. The method of claim 1 , wherein the set of candidate timeslots comprises (a) timeslots between two timeslots that are identified based on a reporting period and a reporting timeslot offset, or (b) a predetermined number of contiguous timeslots.
4. The method of claim 1 , wherein a second and subsequent of the one or more timeslots comprising the multiple transmission occasions are G×T p timeslots after an initial timeslot of the one or more timeslots, wherein G is an integer, and wherein T p is the time gap between adjacent transmission occasions of the multiple transmission occasions.
5. The method of claim 1 , further comprising:
determining, based on a reporting period, a reporting timeslot offset, or a number of timeslots after a timeslot in which the performing multiple transmissions is triggered, a first of the number of the multiple transmission occasions.
6. The method of claim 5 , wherein the number of timeslots is a predetermined value or indicated by signaling information.
7. The method of claim 1 , further comprising:
receiving a signal that deactivates the performing multiple transmissions, wherein a last of the one or more timeslots is a fixed number of timeslots after a timeslot in which the signal is received.
8. The method of claim 1 , further comprising:
generating an encoded sequence by encoding repetitions of the channel measurement report, wherein the channel measurement report is based on the encoded sequence.
9. The method of claim 8 , wherein identical portions of the encoded sequence are transmitted in each of the number of the multiple transmission occasions.
10. The method of claim 8 , further comprising:
segmenting the encoded sequence into a plurality of contiguous sub-sequences in a non-overlapping manner; and
transmitting each of the plurality of contiguous sub-sequences in each of the number of the multiple transmission occasions.
11. The method of claim 8 , further comprising:
mapping the encoded sequence to a circular buffer;
generating a plurality of contiguous sub-sequences, wherein each of the plurality of contiguous sub-sequences comprises a predetermined number of symbols, wherein a first symbol of a first of the plurality of contiguous sub-sequences is a starting symbol of the encoded sequence in the circular buffer, wherein a second and subsequent of the plurality of contiguous sub-sequences are non-overlapping contiguous portions of encoded sequence in the circular buffer, wherein a sum of the predetermined number of symbols of each of the plurality of contiguous sub-sequences is greater than a number of symbols of the encoded sequence, and wherein the predetermined number of symbols of each of the plurality of contiguous sub-sequences and the starting symbol of the encoded sequence in the circular buffer is specified by signaling information; and
transmitting each of the plurality of contiguous sub-sequences in each of the number of the multiple transmission occasions.
12. The method of claim 8 , wherein the encoding is based on a redundant value (RV) sequence, and wherein the method further comprises:
segmenting the encoded sequence into a plurality of contiguous sub-sequences in a non-overlapping manner; and
transmitting each of the plurality of contiguous sub-sequences in each of the number of the multiple transmission occasions based on each of the RV sequence.
13. The method of claim 1 , wherein a first set of transmissions comprises the multiple transmissions of the channel measurement report, wherein a second set of transmissions comprises at least one transmission of another channel measurement report, wherein one of the first set of transmissions and one of the second set of transmissions are both scheduled on a transmission occasion in the one or more timeslots, wherein the one of the first set of transmissions has a higher priority than the one of the second set of transmissions based on a priority rule, wherein the one of the first set of transmissions is performed on the transmission occasion, and wherein the one of the second set of transmissions is dropped.
14. The method of claim 13 , wherein the at least one transmission of another channel measurement report comprises a single transmission.
15. The method of claim 13 , wherein the one of the first set of transmissions has a first index, and wherein the one of the second set of transmissions has a second index greater than the first index.
16. The method of claim 15 , wherein the first index is a redundant version (RV) value.
17. The method of claim 1 , wherein the channel measurement report is transmitted semi-persistently over a physical uplink shared channel (PUSCH).
18. The method of claim 1 , wherein the channel measurement report is transmitted aperiodically over a physical uplink control channel (PUCCH).
19. The method of claim 1 , wherein the wireless node is a user equipment operating in a mobile communication network, and wherein the channel measurement report comprises channel state information (CSI).
20. A wireless communication apparatus, comprising:
a processor configured to implement a method, the processor configured to:
perform multiple transmissions of a channel measurement report on multiple transmission occasions,
wherein a timing of the multiple transmissions is based on any one or more of a number of the multiple transmission occasions, a time gap between adjacent transmission occasions of the multiple transmission occasions, and one or more timeslots comprising the multiple transmission occasions, and
wherein the one or more timeslots comprising the number of the multiple transmission occasions is determined based on a bitmap for a set of candidate timeslots.
21. The wireless communication apparatus of claim 20 , wherein the set of candidate timeslots comprises (a) timeslots between two timeslots that are identified based on a reporting period and a reporting timeslot offset, or (b) a predetermined number of contiguous timeslots.
22. The wireless communication apparatus of claim 20 , wherein a second and subsequent of the one or more timeslots comprising the multiple transmission occasions are G×T p timeslots after an initial timeslot of the one or more timeslots, wherein G is an integer, and wherein T p is the time gap between adjacent transmission occasions of the multiple transmission occasions.
23. The wireless communication apparatus of claim 20 , wherein the processor is further configured to:
determine, based on a reporting period, a reporting timeslot offset, or a number of timeslots after a timeslot in which the performing multiple transmissions is triggered, a first of the number of the multiple transmission occasions.
24. The wireless communication apparatus of claim 20 , wherein the processor is further configured to:
receive a signal that deactivates the performing multiple transmissions, wherein a last of the one or more timeslots is a fixed number of timeslots after a timeslot in which the signal is received.
25. The wireless communication apparatus of claim 20 , wherein the processor is further configured to:
generate an encoded sequence by the processor configured to encode repetitions of the channel measurement report, wherein the channel measurement report is based on the encoded sequence.