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 allocating resources for a scheduling request indicator (SRI), comprising:
transmitting an SRI cycle period for use by user equipment (UE) within a cell;
transmitting a specific SRI subframe offset to a first UE;
transmitting an index value n to the first UE; and
wherein the specific SRI subframe offset and the index value n enable the first UE to determine a unique combination of cyclic shift, reference signal (RS) orthogonal cover, data orthogonal cover, and resource block number for the first UE to use as a unique physical resource for an SRI in the physical uplink control channel (PUCCH);
wherein the SRI is transmitted on a two-state SR channel.
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 SRI cycle period, the specific SRI subframe offset and the index value n are transmitted in UE-specific level three (L3) signaling in media access control (MAC) protocol data unit (PDU) on a physical downlink shared channel (PDSCH).
4. The method of claim 1 , wherein the specific SRI subframe offset and the index value n enable the first 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
mod
N
SRI
SFRB
N
SRI
N
SRI
SFRB
⌋
;
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 an RB; and
wherein N SRI is the SRI period expressed in number 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.
5. The method of claim 4 , 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).
6. The method of claim 4 , wherein resources used for 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 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.
7. The method of claim 1 , further comprising receiving an SRI from the first UE on the unique physical resource in accordance with the specific SRI subframe offset and the index value n.
8. A method for allocating resources for a scheduling request indicator (SRI), comprising:
receiving an SRI cycle period for use by user equipment (UE) within a cell;
receiving a specific SRI subframe offset at a first UE;
receiving an index value n at the first UE; and
determining a unique combination of cyclic shift, reference signal (RS) orthogonal cover, data orthogonal cover, and resource block number for the first UE to use as a unique physical resource for an SRI in the physical uplink control channel (PUCCH) according to the specific SRI subframe offset and the index value n;
wherein the SRI is transmitted on a two-state SR channel.
9. The method of claim 8 wherein the SRI cycle period extends the unique physical resource to a persistent periodic physical resource.
10. The method of claim 8 wherein the SRI cycle period, the specific SRI subframe offset and the index value n are received in level three (L3) signaling in media access control (MAC) protocol data unit (PDU) on a physical downlink shared channel (PDSCH).
11. The method of claim 8 , wherein the specific SRI subframe offset and the index value n enable the first 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 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.
12. The method of claim 11 , 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).
13. The method of claim 11 , wherein resources used for 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.
14. The method of claim 8 , further comprising transmitting an SRI from the first UE on the unique physical resource in accordance with the specific SRI subframe offset and the index value n.
15. An apparatus for use in a wireless network, comprising:
a processor operable to execute instructions, coupled to a memory containing instructions for the processor;
a radio receiver and a transmitter coupled to the processor;
wherein the receiver is operable to:
receive a scheduling request indicator (SRI) cycle period for use by user equipment (UE) within a cell;
receive a specific SRI subframe offset;
receiving an index value n; and
wherein the processor is operable to 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 an SRI in a physical uplink control channel (PUCCH) according to the specific SRI subframe offset and the index value n);
wherein the SRI is transmitted on a two-state SR channel.
16. The apparatus of claim 15 , wherein the processor is further operable to determine data is ready for transmission on a physical uplink shared channel (PUSCH), and to instruct the transmitter to transmit an SRI on the unique physical resource on the PUCCH.
17. The apparatus of claim 15 wherein the SRI cycle period extends the unique physical resource to a persistent periodic physical resource.
18. The apparatus of claim 15 wherein the SRI cycle period, the specific SRI subframe offset and the index value n are received in level three (L3) signaling in media access control (MAC) protocol data unit (PDU) on a physical downlink shared channel (PDSCH).
19. The apparatus of claim 15 being a cellular telephone.