Integrated circuit for controlling selection of random access preamble sequence
View Patent ↗A sequence allocating method and apparatus wherein in a system where a plurality of different Zadoff-Chu sequences or GCL sequences are allocated to a single cell, the arithmetic amount and circuit scale of a correlating circuit at a receiving end can be reduced. In ST 201 , a counter (a) and a number (p) of current sequence allocations are initialized, and in ST 202 , it is determined whether the number (p) of current sequence allocations is coincident with a number (K) of allocations to one cell. In ST 203 , it is determined whether the number (K) of allocations to the one cell is odd or even. If K is even, in ST 204 -ST 206 , sequence numbers (r=a and r=N−a), which are not currently allocated, are combined and then allocated. If K is odd, in ST 207 -ST 212 , for sequences that cannot be paired, one of sequence numbers (r=a and r=N−a), which are not currently allocated, is allocated.
1. An integrated circuit to control a process, the process comprising:
broadcasting information related to a set of sequences configured to be available in a cell for use by a mobile station; and
receiving a sequence which is random-access-preamble-transmitted from the mobile station, the sequence being one of the set of sequences available in the cell;
wherein the set of sequences available in the cell includes a sequence of r=a and a sequence of r=N−a, where r is a sequence number, a is an integer, and N is a sequence length, and the sequences are defined by the following equation or an equation cyclic shifted from the following equation:
c
r
(
k
)
=
exp
{
-
j
2
π
r
N
(
k
(
k
+
1
)
2
+
qk
)
}
where k=0,1,2, . . . N−1, and q is an integer, and
the sequence of r=a and the sequence of r=N−a are conjugate to each other.
2. The integrated circuit according to claim 1 , comprising:
circuitry which, in operation, controls the process;
at least one input coupled to the circuitry, wherein the at least one input, in operation, inputs data; and
at least one output coupled to the circuity, wherein the at least one output, in operation, outputs data.
3. The integrated circuit according to claim 2 , wherein the set of sequences available in the cell further includes a sequence of r=a′ (a′≠a) and a sequence of r=N−a′.
4. The integrated circuit according to claim 2 , wherein the N is a prime number.
5. The integrated circuit according to claim 2 , wherein the set of sequences available in the cell is configured by a network.
6. The integrated circuit according to claim 2 , wherein a number of the sequences configured to be included in the set of sequences available in the cell is less than the N.
7. The integrated circuit according to claim 2 , wherein the information broadcasted includes an index indicative of the set of sequences available in the cell.
8. The integrated circuit according to claim 2 , wherein the at least one output and the at least one input, in operation, are coupled to an antenna.
9. An integrated circuit comprising:
circuitry which, in operation:
controls broadcast of information related to a set of sequences configured to be available in a cell for use by a mobile station; and
controls reception of a sequence which is random-access-preamble-transmitted from the mobile station, the sequence being one of the set of sequences available in the cell;
wherein the set of sequences available in the cell includes a sequence of r=a and a sequence of r=N−a, where r is a sequence number, a is an integer, and N is a sequence length, and the sequences are defined by the following equation or an equation cyclic shifted from the following equation:
c
r
(
k
)
=
exp
{
-
j
2
π
r
N
(
k
(
k
+
1
)
2
+
qk
)
}
where k=0,1,2, . . . N−1, and q is an integer, and
the sequence of r=a and the sequence of r=N−a are conjugate to each other.
10. The integrated circuit according to claim 9 , further comprising:
at least one input coupled to the circuitry, wherein the at least one input, in operation, inputs data; and
at least one output coupled to the circuity, wherein the at least one output, in operation, outputs data.
11. The integrated circuit according to claim 10 , wherein the set of sequences available in the cell further includes a sequence of r=a′ (a′≠a) and a sequence of r=N−a′.
12. The integrated circuit according to claim 10 , wherein the N is a prime number.
13. The integrated circuit according to claim 10 , wherein the set of sequences available in the cell is configured by a network.
14. The integrated circuit according to claim 10 , wherein a number of the sequences configured to be included in the set of sequences available in the cell is less than the N.
15. The integrated circuit according to claim 10 , wherein the information broadcasted includes an index indicative of the set of sequences available in the cell.
16. The integrated circuit according to claim 10 , wherein the at least one output and the at least one input, in operation, are coupled to an antenna.