Sequence allocating method and sequence allocating apparatus
View Patent ↗A sequence allocating method and a sequence allocating 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. According to these method and apparatus, 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. A sequence allocating apparatus comprising:
a sequence allocator that allocates sequences available for random-access transmission in a cell, and
a reporter that reports a signal including information indicating allocated sequences, which are allocated to the cell by the sequence allocator, to a base station corresponding to the cell;
wherein the allocated sequences include a sequence of r=a and a sequence of r=N−a, where r is a sequence index, a is an integer, and N is a sequence length, and the allocated sequences are defined by 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.
2. The sequence allocating apparatus according to claim 1 , wherein the allocated sequences further include a sequence of r=a′ (a′≠a) and a sequence of r=N−a′.
3. The sequence allocating apparatus according to claim 1 , wherein the N is a prime number.
4. A sequence allocation method to be performed by a sequence allocating apparatus, the sequence allocation method comprising:
allocating sequences available for random-access transmission in a cell, and
reporting a signal including information indicating allocated sequences, which are allocated to the cell, to a base station corresponding to the cell;
wherein the allocated sequences include a sequence of r=a and a sequence of r=N−a, where r is a sequence index, a is an integer, and N is a sequence length, and the allocated sequences are defined by 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.
5. The sequence allocation method according to claim 4 , wherein the allocated sequences further include a sequence of r=a′ (a′≠a) and a sequence of r=N−a′.
6. The sequence allocation method according to claim 4 , wherein the N is a prime number.