Method and transmitter element for transmitting channel information for link adaptation, method and receiver element for receiving the channel information
View Patent ↗The present invention refers to a method and a transmitter element ( 35 ) for transmitting channel information (CI) for link adaptation of a radio channel ( 33 ) in a wireless network ( 11 ). In order to allow for reliable and efficient transfer of the channel information (CI) and to adapt the detection probability to the importance of the CI as well as to the channel stability, it is suggested that the method comprises encoding ( 19 ) the channel information (CI) using multi-level coding, said multi-level coding ( 19 ) comprising combining multiple bit sequences (c 1 , c 2 , . . . , cn, d), each bit sequence (c 1 , c 2 , . . . , cn, d) corresponding to a coding level ( 1 , . . . , n) of said multilevel coding ( 19 ) and assigning ( 37 ) one of said coding levels ( 1 , . . . , n) to at least a part (ci 1 , ci 2 ) of the channel information (CI) such that at least a part (ci 1 , ci 2 ) of the channel information (CI) corresponds to the bit sequence (c 1 , c 2 , . . . , cn) of that coding level ( 1 , . . . , n). Furthermore, the present invention refers to a method and a receiver element for receiving the transmitted channel information (CI).
1. A method of transmitting channel information for link adaptation of a radio channel in a wireless network, the method comprising:
encoding the channel information using multi-level coding, said multi-level coding comprising combining multiple bit sequences, each bit sequence corresponding to a coding level of said multi-level coding; and
assigning one of said coding levels to at least a part of the channel information such that the at least a part of the channel information corresponds to the bit sequence of that coding level;
wherein the method comprises subdividing the channel information into multiple parts of channel information according to an importance of parts of channel information for the link adaptation and assigning one of said coding levels to at least one part of said multiple parts.
2. The method according to claim 1 , wherein the method comprises assigning multiple coding levels to multiple parts of the channel information, a detection probability of the coding level assigned to at least one of said multiple parts being higher than the detection probability of the coding level assigned to any further part of said multiple parts having a lower importance with respect to link adaptation than said at least one part.
3. The method according to claim 1 , wherein the at least one coding level is assigned dynamically to the at least one part of channel information according to a momentary importance of parts of channel information in the link adaptation.
4. The method according to claim 1 , wherein a first part of said multiple parts of channel information comprises wideband information related to the whole radio channel and a second part of said multiple parts of channel information comprises sub-band information related to at least one sub-band of the radio channel, the first part having a higher importance with respect to the link adaptation than the second part.
5. The method according to claim 1 , wherein the channel information comprises coarse information, preferably coarse precoding vector information characterising a coarse precoding vector, and refining information for refining the coarse information, preferably refining precoding information for determining a fine-grained precoding vector based on the coarse precoding vector, the coarse information corresponding to a part of said multiple parts of channel information that has a higher importance than a further part of said multiple parts corresponding to the refining information.
6. The method according to claim 1 , wherein the method comprises transmitting payload data using said multi-level coding and assigning different coding levels to the payload data and to the at least a part of the channel information.
7. The method according to claim 6 , wherein the coding levels are assigned dynamically to the payload data and to the at least a part of the channel information.
8. A method of receiving channel information for link adaptation of a radio channel of a wireless network, the method comprising:
decoding the channel information using multi-level decoding, said multi-level decoding comprising detecting multiple bit sequences, each bit sequence corresponding to a coding level of said multi-level decoding; and
determining at least a part of the channel information depending on the bit sequence corresponding to a predefined coding level;
wherein the channel information is subdivided into multiple parts of channel information according to an importance of parts of channel information for the link adaptation and wherein a first part of said multiple parts of channel information comprises wideband information related to the whole radio channel and a second part of said multiple parts of channel information comprises sub-band information related to one or more sub-bands of the radio channel, the first part having a higher importance with respect to link adaptation than the second part.
9. The method according to claim 8 , wherein the channel information is subdivided into multiple parts of channel information according to an importance of these-parts of channel information for the link adaptation and wherein the channel information comprises coarse information, preferably coarse precoding vector information characterising a coarse precoding vector, and refining information for refining the coarse information, preferably refining precoding information for determining a fine-grained precoding vector based on the coarse precoding vector, the coarse information corresponding to a part of said multiple parts of channel information that has a higher importance than a further part of said multiple parts corresponding to the refining information.
10. The method according to claim 8 , wherein the method comprises receiving payload data using said multi-level decoding, different coding levels being assigned to the payload data (d) and to the at least one part of the channel information.
11. A transmitting device including:
A memory with executable instructions stored thereon; and
A processor configured to access said memory to execute said executable instructions and to:
encode the channel information using multi-level coding, said multi-level coding comprising combining multiple bit sequences, each bit sequence corresponding to a coding level of said multi-level coding; and
assign one of said coding levels to at least a part of the channel information such that the at least a part of the channel information corresponds to the bit sequence of that coding level;
wherein the transmitting device is further configured to subdivide the channel information into multiple parts of channel information according to an importance of parts of channel information for the link adaptation and assign one of said coding levels to at least one part of said multiple parts.
12. A receiving device including:
A memory with executable instructions stored thereon; and
A processor configured to access said memory to execute said executable instructions and to:
decode the channel information using multi-level decoding, said multi-level decoding comprising detecting multiple bit sequences, each bit sequence corresponding to a coding level of said multi-level decoding; and
determine at least a part of the channel information depending on the bit sequence corresponding to a predefined coding level;
wherein the channel information is subdivided into multiple parts of channel information according to an importance of parts of channel information for the link adaptation and wherein a first part of said multiple parts of channel information comprises wideband information related to the whole radio channel and a second part of said multiple parts of channel information comprises sub-band information related to one or more sub-bands of the radio channel, the first part having a higher importance with respect to link adaptation than the second part.