Sounding reference signal enhancements for wireless communication

1. A method for wireless communication, comprising:

determining whether a wireless device requires dynamic sounding reference signal (SRS) resources;

providing a dynamic SRS resource allocation to the wireless device from a set of resources reserved for dynamic SRS transmissions when a determination is made that the dynamic SRS resources are required by the wireless device; wherein the resources reserved for dynamic SRS transmissions are in addition to resources allocated to the wireless device for periodic SRS transmissions; and

signaling the dynamic SRS resource allocation to the wireless device in a scheduling grant.

2. The method of claim 1 , wherein the determining includes receiving a request for the dynamic SRS resources from the wireless device.

3. The method of claim 1 , wherein the providing includes signaling the dynamic SRS resource allocation along with a group of dynamic SRS resource allocations over a physical downlink control channel.

4. The method of claim 1 , further comprising dynamically allocating semi-persistent SRS resources to the wireless device.

5. The method of claim 1 , wherein the determining includes estimating an operational parameter for a communication channel with the wireless device.

6. The method of claim 5 , wherein the operational parameter includes one of a traffic activity and an error rate for the communication channel with the wireless device.

7. The method of claim 1 , further comprising configuring, semi-statically, the set of resources for the dynamic SRS resource allocation for the wireless device.

8. The method of claim 7 , wherein the set of resources comprises orthogonal SRS resources.

9. A wireless communication apparatus, comprising:

a memory configured to store instructions to:

determine whether a wireless device requires dynamic sounding reference signal (SRS) resources;

provide a dynamic SRS resource allocation to the wireless device from a set of resources reserved for dynamic SRS transmissions when a determination is made that the dynamic SRS resources are required by the wireless device; wherein the resources reserved for dynamic SRS transmissions are in addition to resources allocated to the wireless device for periodic SRS transmissions; and

signal the dynamic SRS resource allocation to the wireless device in a scheduling grant; and

a processor configured to execute the instructions from the memory.

10. The wireless communications apparatus of claim 9 , wherein the memory further stores instructions to receive a request for the dynamic SRS resources from the wireless device.

11. The wireless communication apparatus of claim 9 , wherein the memory further stores instructions to estimate an operational parameter for a communication channel with the wireless device.

12. An apparatus for wireless communication, comprising:

means for determining whether a wireless device requires dynamic sounding reference signal (SRS) resources;

means for providing a dynamic SRS resource allocation to the wireless device from a set of resources reserved for dynamic SRS transmissions when a determination is made that the dynamic SRS resources are required by the wireless device; wherein the resources reserved for dynamic SRS transmissions are in addition to resources allocated to the wireless device for periodic SRS transmissions; and

means for signaling the dynamic SRS resource allocation to the wireless device in a scheduling grant.

13. A non-transitory computer-readable medium for storing instructions executable by a processor, comprising:

instructions to determine whether a wireless device requires dynamic sounding reference signal (SRS) resources;

instructions to provide a dynamic SRS resource allocation to the wireless device from a set of resources reserved for dynamic SRS transmissions when a determination is made that the dynamic SRS resources are required by the wireless device; wherein the resources reserved for dynamic SRS transmissions are in addition to resources allocated to the wireless device for periodic SRS transmissions; and

instructions to signal the dynamic SRS resource allocation to the wireless device in a scheduling grant.

14. A method for wireless communication, comprising:

receiving a dynamic sounding reference signal (SRS) resource allocation at a wireless device from a set of resources reserved for dynamic SRS transmissions; wherein the resources reserved for dynamic SRS transmissions are in addition to resources allocated to the wireless device for periodic SRS transmissions, and wherein the dynamic SRS resource allocation is received in an uplink or downlink scheduling grant; and

transmitting SRS according to the dynamic SRS resource allocation.

15. The method of claim 14 , further comprising:

determining whether dynamic SRS resources are needed; and

requesting, based on the determination, the dynamic SRS resources.

16. A wireless communication apparatus, comprising:

a memory configured to store instructions to:

receive at the wireless communication apparatus a dynamic sounding reference signal (SRS) resource allocation from a set of resources reserved for dynamic SRS transmissions; wherein the resources reserved for dynamic SRS transmissions are in addition to resources allocated to the wireless communication apparatus for periodic SRS transmissions, and wherein the dynamic SRS resource allocation is received in an uplink or downlink scheduling grant; and

transmit SRS according to the dynamic SRS resource allocation; and

a processor configured to execute the instructions from the memory.

17. A wireless communication apparatus, comprising:

means for receiving, at the wireless communication apparatus, a dynamic sounding reference signal (SRS) resource allocation from a set of resources reserved for dynamic SRS transmissions; wherein the resources reserved for dynamic SRS transmissions are in addition to resources allocated to the wireless communication apparatus for periodic SRS transmissions, and wherein the dynamic SRS resource allocation is received in an uplink or downlink scheduling grant; and

means for transmitting SRS according to the dynamic SRS resource allocation.

18. A non-transitory computer-readable medium for storing instructions executable by a processor, comprising:

instructions to receive a dynamic sounding reference signal (SRS) resource allocation at a wireless device from a set of resources reserved for dynamic SRS transmissions; wherein the resources reserved for dynamic SRS transmissions are in addition to resources allocated to the wireless device for periodic SRS transmissions, and wherein the dynamic SRS resource allocation is received in an uplink or downlink scheduling grant; and

instructions to transmit SRS according to the receiving dynamic SRS resource allocation.