Allocation and logical to physical mapping of scheduling request indicator channel in wireless networks
A method for allocating resources for a scheduling request indicator (SRI) is disclosed. An SRI cycle period for use by user equipment (UE) within a cell is transmitted from a NodeB in a cell to UE within the cell. The NodeB transmits a specific SRI subframe offset and an index value to the particular UE within the cell. The specific SRI subframe offset and the index value enable the UE to determine a unique combination of cyclic shift, RS orthogonal cover, data orthogonal cover, and resource block number for the UE to use as a unique physical resource for an SRI in the physical uplink control channel (PUCCH).
1. A method for sending a scheduling request indicator (SRI) by a user equipment (UE), comprising:
receiving an index value n;
determining an SRI cycle period;
determining a SRI subframe offset;
determining a unique combination of cyclic shift, reference signal (RS) orthogonal cover, data orthogonal cover, and resource block number to use as a unique physical resource for the SRI in a physical uplink control channel (PUCCH) according to the index value n; and
transmitting the SRI at a next assigned transmission opportunity after the UE determines that it needs to transmit data or information;
wherein the next assigned SRI transmission opportunity is based upon the SRI cycle period and the SRI subframe offset.
2. The method of claim 1 wherein the SRI cycle period extends the unique physical resource to a persistent periodic physical resource.
3. The method of claim 1 wherein the index value n is received in higher level signaling.
4. The method of claim 3 wherein the higher level signaling is radio resource control (RRC) signaling.
5. The method of claim 1 , wherein the specific SRI subframe offset and the index value n enable the UE to determine a unique combination, wherein an SRI resource indexed by n is located in a physical uplink control channel (PUCCH) resource block (RB) number wherein the PUCCH RB number is └n/N SRI SFRB N SRI ┘;
a subframe S 0 +└(n mod N SRI SFRB N SRI )/N SRI SFRB ┘ indicating where an SRI resource is located on a channelization resource indexed by n SRI (SRI resource index)=(n mod N SRI SFRB );
wherein the acronym SFRB means subframe source block;
wherein N SRI SFRB is the SRI multiplexing capacity in one subframe of a RB; and
wherein N SRI is the SRI period expressed in number of subframes, and S 0 is the number of a first subframe of an SRI period, and assuming a PUCCH RB indexing starts from an upper edge of the PUCCH down to a lower edge.
6. The method of claim 1 , wherein
N SRI SFRB is the SRI multiplexing capacity in one subframe of a RB, given a cyclic shift separation Δ shift PUCCH between resources using the same orthogonal covering code,
N
SRI
SFRB
=
{
6
N
SC
RB
/
Δ
shift
PUCCH
for
normal
cyclic
prefix
4
N
SC
RB
/
Δ
shift
PUCCH
for
extended
cyclic
prefix
,
wherein N SC RB is the number N of sub-carriers (SC) in one resource block (RB).
7. The method of claim 1 , wherein resources used for the SRI transmission on PUCCH in a given RB/subframe are identified by the resource index n SRI from which the orthogonal sequence indexes n OC,1 (n s ) , n OC,2 (n s ) , n OC,3 (n s ) of the block spreading codes 1 , 2 and 3 respectively, and a cyclic shift α(l) are determined according to:
n OC,1 (n s ) =(n OC,1 (0) +f 1 (n s ))mod 3
n OC,2 (n s ) =(n OC,2 (0) +f 2 (n s ))mod 3
n OC,3 (n s ) =(n OC,3 (0) +f 3 (n s ))mod 3
α( l )=(α (0) +f 4 ( l ))mod N SC Rb
where N SC RB =12 is the number of sub-carriers in one resource block (RB) and
n
OC
,
1
(
0
)
=
{
⌊
(
n
SRI
mod
(
N
SRI
SFRB
/
2
)
)
Δ
shift
PUCCH
/
N
SC
RB
⌋
for
normal
cyclic
prefix
2
⌊
(
n
SRI
mod
(
N
SRI
SFRB
/
2
)
)
Δ
shift
PUCCH
/
N
SC
RB
⌋
for
extended
cyclic
prefix
n
OC
,
2
(
0
)
=
⌊
(
n
SRI
mod
(
N
SRI
SFRB
/
2
)
)
Δ
shift
PUCCH
/
N
SC
RB
⌋
n
OC
,
3
(
0
)
=
⌊
2
n
SRI
/
N
SRI
SFRB
⌋
α
(
0
)
=
{
(
(
n
SRI
mod
(
N
SRI
SFRB
/
2
)
)
Δ
shift
PUCCH
+
δ
offset
PUCCH
+
(
n
OC
,
1
(
0
)
mod
Δ
shift
PUCCH
)
)
mod
N
SC
RB
normal
cp
(
(
n
SRI
mod
(
N
SRI
SFRB
/
2
)
)
Δ
shift
PUCCH
+
δ
offset
PUCCH
+
n
OC
,
2
(
0
)
)
mod
N
SC
RB
extended
cp
and f 1 (n s ), f 2 (n s ), f 3 (n s ) represent index hopping functions varying per slot and f 4 (l) represents index hopping function varying per symbol.
8. User equipment (UE) for sending a scheduling request indicator (SRI), comprising:
a transceiver comprising:
a receiver operable to receive:
an index value n; and
a transmitter;
a memory coupled to the transceiver, the memory operable to store:
the index value n from the base station;
a processor coupled to the transceiver and the memory, the processor programmed to:
determine an SRI cycle period;
determine a specific SRI subframe offset; and
determine a unique combination of cyclic shift, reference signal (RS) orthogonal cover, data orthogonal cover, and resource block number to use as a unique physical resource for the SRI in a physical uplink control channel (PUCCH) according to the specific SRI subframe offset and the index value n;
wherein the transmitter is operable to produce and transmit the SRI in a transmission instance allocated for the SRI to the base station when the UE determines that it needs to transmit data or information.
9. The UE of claim 8 wherein the SRI cycle period extends the unique physical resource to a persistent periodic physical resource.
10. The UE claim 8 wherein the index value n is received in higher level signaling.
11. The method of claim 10 wherein the higher level signaling is radio resource control (RRC) signaling.
12. The UE of claim 8 , wherein the specific SRI subframe offset and the index value n enable the UE to determine a unique combination, wherein an SRI resource indexed by n is located in a physical uplink control channel (PUCCH) resource block (RB) number wherein the PUCCH RB number is └n/N SRI SFRB N SRI ┘;
a subframe S 0 +└(n mod N SRI SFRB N SRI )/N SRI SFRB ┘ indicating where an SRI resource is located on a channelization resource indexed by n SRI (SRI resource index)=(n mod N SRI SFRB );
wherein the acronym SFRB means subframe source block;
wherein N SRI SFRB is the SRI multiplexing capacity in one subframe of a RB; and
wherein N SRI is the SRI period expressed in number of subframes, and S 0 is the number of a first subframe of an SRI period, and assuming a PUCCH RB indexing starts from an upper edge of the PUCCH down to a lower edge.
13. The UE of claim 8 , wherein
N SRI SFRB is the SRI multiplexing capacity in one subframe of a RB, given a cyclic shift separation Δ shift PUCCH between resources using the same orthogonal covering code,
N
SRI
SFRB
=
{
6
N
SC
RB
/
Δ
shift
PUCCH
for
normal
cyclic
prefix
4
N
SC
RB
/
Δ
shift
PUCCH
for
extended
cyclic
prefix
.
wherein N SC RB is the number N of sub-carriers (SC) in one resource block (RB).
14. The UE of claim 8 , wherein resources used for the SRI transmission on PUCCH in a given RB/subframe are identified by the resource index n SRI , from which the orthogonal sequence indexes n OC,1 (n s ) , n OC,2 (n s ) , n OC,3 (n s ) of the block spreading codes 1 , 2 and 3 respectively, and a cyclic shift α(l) are determined according to:
n OC,1 (n s ) =(n OC,1 (0) +f 1 (n s ))mod 3
n OC,2 (n s ) =(n OC,2 (0) +f 2 (n s ))mod 3
n OC,3 (n s ) =(n OC,3 (0) +f 3 (n s ))mod 3
α(l)=(α (0) +f 4 ( l ))mod N SC Rb
where N SC RB =12 is the number of sub-carriers in one resource block (RB) and
n
OC
,
1
(
0
)
=
{
⌊
(
n
SRI
mod
(
N
SRI
SFRB
/
2
)
)
Δ
shift
PUCCH
/
N
SC
RB
⌋
for
normal
cyclic
prefix
2
⌊
(
n
SRI
mod
(
N
SRI
SFRB
/
2
)
)
Δ
shift
PUCCH
/
N
SC
RB
⌋
for
extended
cyclic
prefix
n
OC
,
2
(
0
)
=
⌊
(
n
SRI
mod
(
N
SRI
SFRB
/
2
)
)
Δ
shift
PUCCH
/
N
SC
RB
⌋
n
OC
,
3
(
0
)
=
⌊
2
n
SRI
/
N
SRI
SFRB
⌋
α
(
0
)
=
{
(
(
n
SRI
mod
(
N
SRI
SFRB
/
2
)
)
Δ
shift
PUCCH
+
δ
offset
PUCCH
+
(
n
OC
,
1
(
0
)
mod
Δ
shift
PUCCH
)
)
mod
N
SC
RB
normal
cp
(
(
n
SRI
mod
(
N
SRI
SFRB
/
2
)
)
Δ
shift
PUCCH
+
δ
offset
PUCCH
+
n
OC
,
2
(
0
)
)
modN
SC
RB
extended
cp
and f 1 (n s ), f 2 (n s ), f 3 (n s ) represent index hopping fuctions varying per slot and f 4 (l) represent index hopping function varying per symbol.