System and method for improved control channel transmit diversity
View Patent ↗A method for providing transmit diversity in wireless network communications is presented. An indication of a slot structure is received. The slot structure identifies at least a first location of a reference signal within a slot. A first reference signal is transmitted within a first slot using a first antenna. A location of the first reference signal within the first slot is determined by the slot structure. A second reference signal is transmitted within the first slot using a second antenna. A location of the second reference signal within the first slot is determined by the slot structure. In some cases, the slot structure identifies a second location of a reference signal within the slot structure. The second location being offset from the first location, and a third reference signal is transmitted within the first slot at the second location on the first antenna.
1. A user equipment (UE) comprising:
a processor, the processor being configured to:
transmit a transformed first symbol and a transformed second symbol within a first slot using a second antenna and a first orthogonal resource, the first transformed symbol being transmitted after the second transformed symbol;
transmit a first reference signal within the first slot at a first location determined by the slot structure, the first reference signal being transmitted using the first antenna; and
transmit a second reference signal within the first slot at a second location determined by the slot structure, the second reference signal being transmitted using a second antenna.
2. The UE of claim 1 , the processor further configured to:
transmit a third symbol within the first slot using the first antenna and the first orthogonal resource; and
transmit the third symbol within the first slot using the second antenna and a second orthogonal resource.
3. The UE of claim 1 , wherein the first transformed symbol and the second transformed symbol are transformed by at least one of negating at least one of a first and second symbol, complex conjugation of at least one of a first and second symbol, and leaving at least one of a first and second symbol unchanged.
4. The UE of claim 1 , wherein the first transformed symbol and the second transformed symbol are transformed by:
using a first transformation to transform a first symbol; and
using a second transformation to transform a second symbol, the first transformation being different from the second transformation.
5. The UE of claim 1 , the processor further configured to receive an indication of a slot structure by receiving a cqi-pucch resource index.
6. The UE of claim 1 , wherein the second location of the second reference signal within the first slot is equal to the first location of the first reference signal within the first slot.
7. A user equipment (UE), comprising:
a processor, the processor being configured to:
receive an indication of a slot structure, the slot structure identifying at least a first location of a reference signal within a slot and a second location of a reference signal within the slot, the second location being offset from the first location;
transmit a first reference signal within a first slot using a first antenna at the first location;
transmit a second reference signal within the first slot using a second antenna at the first location; and
transmit a third reference signal within the first slot using the first antenna at the second location.
8. The UE of claim 7 , wherein the location of the second reference signal within the slot is equal to the location of the first reference signal within the slot.
9. The UE of claim 7 , wherein the slot structure identifies a plurality of reference signal locations in the slot.
10. The UE of claim 7 , wherein the slot structure is one of a plurality of slot structures, at least two of the plurality of slot structures having distinct reference signal locations.
11. The UE of claim 7 , wherein the processor receiving an indication of a slot structure includes receiving a cqi-pucch resource index.
12. The UE of claim 7 , the processor further configured to transmit a plurality of reference signals in a second slot, the second slot having a slot structure with a different configuration from a first slot structure, the first and second slot being transmitted in a first subframe.
13. The UE of claim 7 , wherein the slot structure further identifies a first and second orthogonal code associated with the slot,
wherein transmitting the first reference signal comprises encoding the first reference signal using the first orthogonal code, and
wherein transmitting the second reference signal comprises encoding the second reference signal using the second orthogonal code.
14. A user equipment (UE), comprising:
a processor, the processor being configured to:
receive an indication of a Physical Uplink Control Channel (PUCCH) timing advance;
transmit a first reference signal of a PUCCH at a delay relative to downlink frame timing at least partially determined by the PUCCH timing advance;
transmit a second reference signal of a PUCCH at a delay relative to downlink frame timing at least partially determined by the PUCCH timing advance; and
transmit a reference signal in a Physical Uplink Shared Channel (PUSCH) at a delay relative to downlink frame timing at least partially determined by a different timing advance than the PUCCH timing advance.