Method, device and computer readable medium of communication

1. A method of communication, comprising:

transmitting, at a network device and to a terminal device, channel state information reference signals associated with first number of ports at the network device;

receiving, from the terminal device, compressed channel state information generated based on capability of the terminal device; and

recovering, from the compressed channel state information, channel state information associated with second number of ports at the network device, the second number of ports being not less than the first number of ports.

2. The method of claim 1 , wherein the transmitting comprises:

compressing original channel state information reference signals associated with the second number of ports into the channel state information reference signals associated with the first number of ports at the network device; and

transmitting the compressed channel state information reference signals to the terminal device.

3. The method of claim 1 , wherein the recovering comprises:

determining whether a mode of the compression of the channel state information is a first compression mode in which the compression is performed based on antenna characteristics at the terminal device; and

in accordance with a determination that the mode of the compression of the channel state information is the first compression mode, recovering the channel state information based on a first predetermined model mapping the compressed channel state information to the channel state information.

4. The method of claim 1 , further comprising:

receiving, from the terminal device, an indication of a codebook for compressing the channel state information, and

wherein the recovering comprises:

determining whether a mode of the compression of the channel state information is a second compression mode in which the compression is performed based on channel propagation characteristics at the terminal device; and

in accordance with a determination that the mode of the compression of the channel state information is the second compression mode,

generating, based on the codebook, processed channel state information; and

recovering the channel state information based on a second predetermined model mapping the processed channel state information to the channel state information.

5. The method of claim 1 , further comprising:

in accordance with a mode of compression of the compressed channel state information being decided by the network device, transmitting, to the terminal device, an indicator representing the mode; and

in accordance with the mode of compression of the compressed channel state information being decided by the terminal device, receiving, from the terminal device, an indicator representing the mode, and

wherein the recovering comprises:

recovering the channel state information based on a predetermined model associated with the mode, the predetermined model mapping the compressed channel state information to the channel state information.

6. A method of communication comprising:

receiving, at a terminal device and from a network device, channel state information reference signals associated with first number of ports at the network device;

determining channel state information based on the channel state information reference signals;

compressing the channel state information based on capability of the terminal device; and

transmitting the compressed channel state information to the network device for recovery of channel state information associated with a second number of ports at the network device, the second number of ports being not less than the first number of ports.

7. The method of claim 6 , wherein the receiving comprises:

receiving, from the network device, compressed channel state information reference signals associated with the first number of ports, the compressed channel state information reference signals associated with the first number of ports being generated from original channel state information reference signals associated with the second number of ports.

8. The method of claim 6 , wherein the compressing comprises:

determining whether the terminal device enables a first compression mode; and

in accordance with a determination that the terminal device enables the first compression mode, compressing the channel state information based on antenna characteristics at the terminal device.

9. The method of claim 6 , wherein the compressing comprises:

determining whether the terminal device enables a second compression mode; and

in accordance with a determination that the terminal device enables the second compression mode, compressing the channel state information based on channel propagation characteristics at the terminal device, and

the method further comprising:

transmitting, to the network device, an indication of a codebook for compressing the channel state information.

10. The method of claim 6 , further comprising:

in accordance with a mode of compression of the compressed channel state information being decided by the terminal device, transmitting, to the network device, an indicator representing the mode; and

in accordance with a mode of compression of the compressed channel state information being decided by the network device, receiving, from the network device, an indicator representing the mode, and

wherein the compressing comprises:

compressing the channel state information based on the mode.

11. A network device, comprising:

at least one processor; and

at least one memory including computer program code;

the at least one memory and the computer program code are configured to, with the at least one processor, cause the network device to:

transmit, at the network device and to a terminal device, channel state information reference signals associated with first number of ports at the network device;

receive, from the terminal device, compressed channel state information generated based on capability of the terminal device; and

recover, from the compressed channel state information, channel state information associated with second number of ports at the network device, the second number of ports being not less than the first number of ports.

12. The network device of claim 11 , wherein the network device is caused to transmit the channel state information reference signals by:

compress original channel state information reference signals associated with the second number of ports into the channel state information reference signals associated with the first number of ports at the network device; and

transmit the compressed channel state information reference signals to the terminal device.

13. The network device of claim 11 , wherein the network device is caused to recover the channel state information by:

determining whether a mode of the compression of the channel state information is a first compression mode in which the compression is performed based on antenna characteristics at the terminal device; and

in accordance with a determination that the mode of the compression of the channel state information is the first compression mode, recovering the channel state information based on a first predetermined model mapping the compressed channel state information to the channel state information.

14. The network device of claim 11 , wherein the network device is further caused to:

receive, from the terminal device, an indication of a codebook for compressing the channel state information, and

wherein the network device is caused to recover the channel state information by:

determining whether a mode of the compression of the channel state information is a second compression mode in which the compression is performed based on channel propagation characteristics at the terminal device; and

in accordance with a determination that the mode of the compression of the channel state information is the second compression mode,

generating, based on the codebook, processed channel state information; and

recovering the channel state information based on a second predetermined model mapping the processed channel state information to the channel state information.

15. The network device of claim 11 , wherein the network device is further caused to:

in accordance with a mode of compression of the compressed channel state information being decided by the network device, transmit, to the terminal device, an indicator representing the mode; and

in accordance with the mode of compression of the compressed channel state information being decided by the terminal device, receive, from the terminal device, an indicator representing the mode, and

wherein the network device is caused to recover the channel state information by:

recovering the channel state information based on a predetermined model associated with the mode, the predetermined model mapping the compressed channel state information to the channel state information.

16. A terminal device, comprising:

at least one processor; and

at least one memory including computer program code;

the at least one memory and the computer program code are configured to, with the at least one processor, cause the terminal device to:

receive, at the terminal device and from a network device, channel state information reference signals associated with first number of ports at the network device;

determine, based on the channel state information reference signals, channel state information;

compress the channel state information based on capability of the terminal device; and

transmit the compressed channel state information to the network device for recovery of channel state information associated with a second number of ports at the network device, the second number of ports being not less than the first number of ports.

17. The terminal device of claim 16 , wherein the terminal device is caused to receive the channel state information reference signals by:

receiving, from the network device, compressed channel state information reference signals associated with the first number of ports, the compressed channel state information reference signals associated with the first number of ports being generated from original channel state information reference signals associated with the second number of ports.

18. The terminal device of claim 16 , wherein the terminal device is caused to compress the channel state information by:

determining whether the terminal device enables a first compression mode; and

in accordance with a determination that the terminal device enables the first compression mode, compressing the channel state information based on antenna characteristics at the terminal device.

19. The terminal device of claim 16 , wherein the terminal device is caused to compress the channel state information by:

determining whether the terminal device enables a second compression mode; and

in accordance with a determination that the terminal device enables the second compression mode, compressing the channel state information based on channel propagation characteristics at the terminal device, and

wherein the terminal device is further caused to:

transmit, to the network device, an indication of a codebook for compressing the channel state information.

20. The terminal device of claim 16 , wherein the terminal device is further caused to:

in accordance with a mode of compression of the compressed channel state information being decided by the terminal device, transmit, to the network device, an indicator representing the mode; and

in accordance with a mode of compression of the compressed channel state information being decided by the network device, receive, from the network device, an indicator representing the mode, and

wherein the terminal device is caused to compress the channel state information by:

compressing the channel state information based on the mode.

21. A non-transitory computer readable medium comprising program instructions for causing an apparatus to perform the method according to claim 1 .

22. A non-transitory computer readable medium comprising program instructions for causing an apparatus to perform the method according to claim 6 .