Integrated circuit for controlling sequence assigning method and reference signal generating method
View Patent ↗Provided is a sequence allocation method capable of reducing inter-cell interference of a reference signal when a ZC sequence is used as the reference signal in a mobile communication system. In the sequence allocation method divides R×M sequences specified by a ZC sequence number r (r=1 to R) and a cyclic shift sequence number m (m=1 to M) into a plurality of sequence groups X (X=1 to R) in accordance with the transmission band width of the reference signal, so that the ZC sequence is allocated to each cell in each sequence group unit. When it is assumed that R=9 and M=6, the number of sequence is 54. Each of the sequence groups is formed by two sequences. Accordingly, the number of sequence groups is 27. The 27 types of sequence groups are allocated to each cell.
1. An integrated circuit for controlling a process comprising:
assigning one of multiple groups, into which sequences provided for each sequence length of a reference signal are divided per each sequence length, to a mobile station apparatus, the reference signal having one of at least two different lengths; and
transmitting, to the mobile station apparatus, control information related to the sequence(s) in one of the multiple groups that is assigned,
wherein the sequences are divided, for each sequence length, into the multiple groups, each of which contains a predefined number of the sequence(s) according to the sequence length, and the predefined number varies depending on the sequence length.
2. The integrated circuit according to claim 1 , wherein the controlled process further comprises receiving the reference signal, which is transmitted from the mobile station apparatus using the sequence in one of the multiple groups that is assigned based on the control information.
3. The integrated circuit according to claim 1 , wherein each of the multiple groups contains the same number of the sequence(s) according to the sequence length.
4. The integrated circuit according to claim 1 , wherein the predefined number is greater where the sequence length is larger than where the sequence length is smaller.
5. The integrated circuit according to claim 1 , wherein the predefined number where the sequence length is less than a threshold value is less than the predefined number where the sequence length is larger than or equal to the threshold value.
6. The integrated circuit according to claim 1 , wherein the group is assigned depending on a cell.
7. The integrated circuit according to claim 1 , wherein the sequence is a Zadoff-Chu sequence.
8. The integrated circuit according to claim 1 , wherein the sequences include multiple cyclically shifted sequences derived from a sequence through different cyclic shift values, and control information related to the cyclic shift value is transmitted to the mobile station.
9. The integrated circuit according to claim 8 , wherein the cyclic shift value is assigned depending on a cell.
10. The integrated circuit according to claim 8 , wherein the controlled process further comprises receiving the reference signal, which is transmitted from the mobile station apparatus using the sequence in one of the multiple groups that is assigned based on the control information, wherein said receiving receives the reference signal, which is multiplexed with a reference signal that is transmitted from another mobile station apparatus using a different cyclically shifted sequence.
11. The integrated circuit according to claim 1 , wherein the number of the multiple groups is constant regardless of the sequence length.
12. An integrated circuit for controlling a process comprising:
receiving control information related to sequences, which are provided for each sequence length of a reference signal and which are divided into multiple groups for each sequence length, the reference signal having one of at least two different lengths; and
generating a reference signal using a sequence in one of the multiple groups that is assigned based on the control information;
wherein the sequences are divided, for each sequence length, into the multiple groups, each of which contains a predefined number of the sequence(s) according to the sequence length, and the predefined number varies depending on the sequence length.
13. The integrated circuit according to claim 12 , wherein each of the multiple groups contains the same number of the sequence(s) according to the sequence length.
14. The integrated circuit according to claim 12 , wherein the predefined number is greater where the sequence length is larger than where the sequence length is smaller.
15. The integrated circuit according to claim 12 , wherein the predefined number where the sequence length is less than a threshold value is less than the predefined number where the sequence length is larger than or equal to the threshold value.
16. The integrated circuit according to claim 12 , wherein the group is assigned depending on a cell.
17. The integrated circuit according to claim 12 , wherein the sequence is a Zadoff-Chu sequence.
18. The integrated circuit according to claim 12 , wherein the sequences include multiple cyclically shifted sequences derived from a sequence through different cyclic shift values, and the reference signal is generated using one of the multiple cyclically shifted sequences based on the control information.
19. The integrated circuit according to claim 18 , wherein the cyclic shift value is assigned depending on a cell.
20. The integrated circuit according to claim 18 , wherein the reference signal is multiplexed with a reference signal, which is generated from another mobile station apparatus using a different cyclically shifted sequence.
21. The integrated circuit according to claim 12 , wherein the number of the multiple groups is constant regardless of the sequence length.