System and method for the placement of rank information in a physical uplink shared channel
A wireless communication network includes a plurality of base stations capable of wireless communication with a plurality of subscriber stations within a coverage area of the network. At least one of the plurality of base stations is capable of selecting up to four orthogonal frequency-division multiplexing (OFDM) symbols in a subframe of a physical uplink shared channel. The up to four OFDM symbols are selected starting from the bottom a resource grid of the of the physical uplink shared channel in a bottom-up manner. And one or more rank information (RI) coded bits are repeated in each of the selected up to four OFDM symbols.
1. A method in a user equipment (UE) for transmitting control information and user data in a communication system, the method comprising:
modulating encoded rank information bits and encoded uplink (UL) data based on a corresponding modulation scheme;
mapping modulated rank information and at least one modulated UL data in a subframe of a physical uplink shared channel, the subframe comprising two slots, each slot comprising a reference signal;
transmitting the subframe including the rank information and the UL data,
wherein the modulated rank information is mapped to a Single Carrier Frequency Division Multiplexing Access (SC-FDMA) symbol that is separated from the reference signal by at least one symbol, and
wherein when the rank information comprises two rank information bits, the two rank information bits are encoded according to a repeated simplex (3,2) code.
2. The method of claim 1 , wherein the two rank information bits are mapped to a three-bit codeword.
3. The method of claim 2 , wherein the three-bit codeword is repeated to form a repeated three-bit codeword.
4. The method of claim 3 , wherein at least a portion of the three-bit codeword is concatenated with the repeated three-bit codeword.
5. The method of claim 1 , wherein mapping the modulated rank information comprises:
mapping the modulated rank information onto at most four SC-FDMA symbols selected in the subframe.
6. The method of claim 5 , wherein the at most four SC-FDMA symbols correspond to up to four of the second, fifth, eighth, and eleventh symbols of the subframe.
7. The method of claim 5 , wherein each of the at most four SC-FDMA symbols is separated from a reference signal by one symbol.
8. An apparatus of a user equipment (UE) for transmitting control information and user data in a communication system, the apparatus comprising:
a channel coding and modulation block configured to:
modulate encoded rank information bits and encoded uplink (UL) data based on a corresponding modulation scheme; and
map modulated rank information and at least one modulated UL data in a subframe of a physical uplink shared channel, the subframe comprising two slots, each slot comprising a reference signal; and
a transmitter configured to transmit the subframe including the rank information and the UL data,
wherein the modulated rank information is mapped to a Single Carrier Frequency Division Multiplexing Access (SC-FDMA) symbol that is separated from the reference signal by at least one symbol, and
wherein when the rank information comprises two rank information bits, the two rank information bits are encoded according to a repeated simplex (3,2) code.
9. The apparatus of claim 8 , wherein the two rank information bits are mapped to a three-bit codeword.
10. The apparatus of claim 9 , wherein the three-bit codeword is repeated to form a repeated three-bit codeword.
11. The apparatus of claim 10 , wherein at least a portion of the three-bit codeword is concatenated with the repeated three-bit codeword.
12. The apparatus of claim 8 , wherein the channel coding and modulation block is configured to map the modulated rank information by mapping the modulated rank information onto at most four SC-FDMA symbols selected in the subframe.
13. The apparatus of claim 12 , wherein the at most four SC-FDMA symbols correspond to up to four of the second, fifth, eighth, and eleventh symbols of the subframe.
14. The apparatus of claim 12 , wherein each of the at most four SC-FDMA symbols is separated from a reference signal by one symbol.
15. A system for communicating control information and user data, the system comprising:
a base station; and
a user equipment (UE) configured to:
modulate encoded rank information bits and encoded uplink (UL) data based on a corresponding modulation scheme;
map modulated rank information and at least one modulated UL data in a subframe of a physical uplink shared channel, the subframe comprising two slots, each slot comprising a reference signal; and
transmit the subframe including the rank information and the UL data to the base station,
wherein the modulated rank information is mapped to a Single Carrier Frequency Division Multiplexing Access (SC-FDMA) symbol that is separated from the reference signal by at least one symbol, and
wherein when the rank information comprises two rank information bits, the two rank information bits are encoded according to a repeated simplex (3,2) code.
16. The system of claim 15 , wherein the two rank information bits are mapped to a three-bit codeword.
17. The system of claim 16 , wherein the three-bit codeword is repeated to form a repeated three-bit codeword.
18. The system of claim 17 , wherein at least a portion of the three-bit codeword is concatenated with the repeated three-bit codeword.
19. The system of claim 15 , wherein the UE is configured to map the modulated rank information by mapping the modulated rank information onto at most four SC-FDMA symbols selected in the subframe.
20. The system of claim 19 , wherein the at most four SC-FDMA symbols correspond to up to four of the second, fifth, eighth, and eleventh symbols of the subframe.
21. The system of claim 19 , wherein each of the at most four SC-FDMA symbols is separated from a reference signal by one symbol.