Apparatus and method for codeword to layer mapping in MIMO transmission wireless systems
A mobile station capable of communicating via an uplink transmission to at least one base station in a Multiple Input Multiple Output wireless network can map codewords to a plurality of layers. The mobile station includes a plurality of transmit antenna and a controller coupled to the plurality of transmit antenna. The controller is configured to map at least one codeword to a plurality of layers. The codeword includes a plurality of code blocks. The controller is configured to generate the plurality of code blocks from a transport block such that the number of code blocks generated correspond to an integer multiple of a number the plurality of layers.
1. For use in a wireless communication network, a mobile station capable of communicating via an uplink transmission to at least one base station in the wireless network, the mobile station comprising:
a plurality of transmit antennas; and
a controller coupled to the plurality of transmit antenna, the controller configured to map at least one codeword to an N L number of layers, wherein one of the at least one codeword comprises a plurality of code blocks, wherein the controller is configured to generate the plurality of code blocks from a transport block such that a number of the plurality of code blocks generated is equal to k×N L , wherein k is an integer value.
2. The mobile station of claim 1 , wherein the number of the plurality of code blocks generated further is defined by:
C=N L ┌C′/N L ┐; and
C′=┌B/(Z−L)┐, wherein B corresponds to a number of bits for the transport block and a transport block cyclic redundancy check (CRC), Z corresponds to a maximum code block size and L is a length of a code block CRC sequence attached to each of the plurality of code blocks.
3. The mobile station of claim 1 , wherein the controller is configured to map the one of the at least one codeword to the N L layers such that each of the N L layers comprises k code blocks.
4. The mobile station of claim 3 , wherein the controller is configured to map the one of the at least one codeword to the N L layers using a layer-first mapping method such that a first group of k consecutive code blocks is mapped to a first layer and a second group of k consecutive code blocks is mapped to a second layer.
5. The mobile station of claim 4 , wherein the controller is configured to map the one of the at least one codeword to the N L layers using a layer-first mapping method according to an equation defined as:
x (h) (i)=d (0) (i+hM symb layer ), wherein h corresponds to a layer in the N L number of layers, i corresponds to a symbol number in the layer, x (h) (i) corresponds to ith symbol in hth layer, d (0) (k) corresponds to kth symbol in the one of the at least one codeword, k is a dummy variable, and M symb layer corresponds to a total number of symbols in the layer.
6. The mobile station of claim 1 , wherein the controller is further configured to receive:
semi-static signaling containing a delta modulation and coding scheme in a higher layer; and
a scheduling assignment containing a modulation and coding scheme field,
wherein the controller is configured to generate:
a first codeword based on the modulation and coding scheme field; and
a second codeword based on a difference between the modulation and coding scheme field and the delta modulation and coding scheme.
7. For use in a wireless communication network, a method for codeword to layer mapping, the method comprising:
receiving by a plurality of transmit antennas a transport block comprising a plurality of information bits;
generating at least one codeword for mapping onto N L number of layers, the at least one codeword comprising a plurality of code blocks, wherein generating the at least one codeword comprises generating the plurality of code blocks from the transport block such that a number of the plurality of code blocks generated is equal to k×N L , wherein k is an integer value; and
mapping the at least one codeword onto the N L number of layers.
8. The method of claim 7 , wherein the number of the plurality of code blocks generated further is defined by:
C=N L ┌C′/N L ┐; and
C′=┌B/(Z−L)┐, wherein B corresponds to a number of bits for the transport block and a transport block cyclic redundancy check (CRC), Z corresponds to a maximum code block size and L is a length of a code block CRC sequence attached to each of the plurality of code blocks.
9. The method of claim 7 , wherein mapping comprises mapping one of the at least one codeword to the N L layers such that each of the N L layers comprises k code blocks.
10. The method of claim 9 , wherein mapping comprises mapping the one of the at least one codeword to the N L layers using a layer-first mapping method such that a first group of k consecutive code blocks is mapped to a first layer and a second group of k consecutive code blocks is mapped to a second layer.
11. The method of claim 10 , wherein mapping the one of the at least one codeword to the N L layers comprises using a layer-first mapping method according to an equation defined as:
x (h) (i)=d (0) (i+hM symb layer ) wherein h corresponds to a layer in the N L number of layers, i corresponds to a symbol number in the layer, x (h) (i) corresponds to ith symbol in hth layer, d (0) (k) corresponds to kth symbol in the one of the at least one codeword, k is a dummy variable, and M symb layer corresponds to a total number of symbols in the layer.
12. The method of claim 7 , further comprising:
receiving semi-static signaling containing a delta modulation and coding scheme in a higher layer;
receiving a scheduling assignment containing a modulation and coding scheme field; and
generating a first codeword based on the modulation and coding scheme field and a second codeword based on a difference between the modulation and coding scheme field and the delta modulation and coding scheme.
13. A transmission apparatus for use in a mobile station capable of communicating via an uplink transmission to at least one base station in a wireless network, the transmission apparatus comprising:
a transceiver coupled to a plurality of transmit antennas; and
a controller coupled to the transceiver, the controller configured to map at least one codeword to an N L number of layers, wherein one of the at least one codeword comprises a plurality of code blocks, wherein the controller is configured to generate the plurality of code blocks from a transport block such that a number of the plurality of code blocks generated is equal to k×N L .
14. The transmission apparatus of claim 13 , wherein k is an integer value.
15. The transmission apparatus of claim 13 , wherein the number of the plurality of code blocks generated further is defined by:
C=N L ┌C′/N L ┐; and
C′=┌B/(Z−L)┐, wherein B corresponds to a number of bits for the transport block and a transport block cyclic redundancy check (CRC), Z corresponds to a maximum code block size and L is a length of a code block CRC sequence attached to each of the plurality of code blocks.
16. The transmission apparatus of claim 13 , wherein the controller is configured to map the one of the at least one codeword to the N L layers such that each of the N L layers comprises k code blocks.
17. The transmission apparatus of claim 16 , wherein the controller is configured to map the one of the at least one codeword to the N L layers using a layer-first mapping method such that a first group of k consecutive code blocks is mapped to a first layer and a second group of k consecutive code blocks is mapped to a second layer.
18. The transmission apparatus of claim 17 , wherein the controller is configured to map the one of the at least one codeword to the N L layers using a layer-first mapping method according to an equation defined as:
x (h) (i)=d (0) (i+hM symb layer ) wherein h corresponds to a layer in the N L number of layers, i corresponds to a symbol number in the layer, x (h) (i) corresponds to ith symbol in hth layer, d (0) (k) corresponds to kth symbol in the one of the at least one codeword, k is a dummy variable, and M symb layer corresponds to a total number of symbols in the layer.
19. The transmission apparatus of claim 13 , wherein the controller is further configured to receive:
semi-static signaling containing a delta modulation and coding scheme in a higher layer; and
a scheduling assignment containing a modulation and coding scheme field,
wherein the controller is configured to generate:
a first codeword based on the modulation and coding scheme field; and
a second codeword based on a difference between the modulation and coding scheme field and the delta modulation and coding scheme.
20. The transmission apparatus of claim 13 , wherein the controller is configured to map the one of the at least one codeword to the N L layers such that each of the plurality of code blocks is mapped to each of the N L layers such that each of the N L layers includes an approximately equal number of modulated symbols of each of the plurality of code blocks.