Utilizing HARQ for uplink grants received in wireless communications
Systems and methodologies are described that facilitate utilizing hybrid automatic repeat/request (HARQ) in system access communications. A HARQ entity is provided that manages a plurality of HARQ processes, which can typically use new data indicators (NDI) to determine when received data is a new transmission or retransmission. For resource grants, the HARQ entity can determine whether the communication is a new transmission or retransmission based on the type of message that contains the grant. In addition, an address comprised within the message, a previous use of the HARQ process, and/or the like can further be utilized to determine whether the message is a new transmission or retransmission. Once determined, the HARQ entity can provide the message to the appropriate HARQ process along with the indication of new transmission or retransmission.
1. A method for interpreting hybrid automatic repeat/request (HARQ) functionality in system access procedures, comprising:
receiving, at a device, a communication comprising a grant of data channel resources for communicating over a wireless network from an access point in the wireless network;
determining whether the grant in the communication is associated with a new transmission or a retransmission based at least in part on a communication type; and
providing the communication to a HARQ process along with an indicator for the new transmission based on the determination and whether a buffer of the HARQ process comprises a response to a system access response.
2. The method of claim 1 , wherein the communication is a random access response.
3. The method of claim 2 , further comprising transmitting a random access request to the access point when switching from an idle mode to an active mode, wherein the communication is received in response to the random access request.
4. The method of claim 1 , wherein the communication type is a control channel transmission and the method further comprising determining an identifier associated with the control channel transmission.
5. The method of claim 4 , wherein when the identifier is a temporary identifier related to the device, the communication is provided to the HARQ process along with an indication of the retransmission.
6. The method of claim 1 , wherein the communication further comprises an identifier related to the HARQ process.
7. A wireless communications apparatus, comprising:
at least one processor configured to:
receive, at a device, a response to a system access request comprising a grant of data channel resources from an access point in a wireless network;
determine whether the grant in the response is associated with a new transmission or a retransmission based at least in part on a response type; and
provide the response to a hybrid automatic repeat/request (HARQ) process along with an indicator for the new transmission based at least in part on the type of the determination and whether a buffer of the HARQ process comprises a response to a system access response; and
a memory coupled to the at least one processor.
8. The wireless communications apparatus of claim 7 , wherein the system access request is a random access preamble, and the at least one processor determines the response is a random access response.
9. The wireless communications apparatus of claim 7 , wherein the at least one processor determines the response type, which comprises an associated identifier related to the wireless communications apparatus.
10. The wireless communications apparatus of claim 9 , wherein the at least one processor is further configured to determine whether the identifier is a temporary or persistent identifier.
11. The wireless communications apparatus of claim 10 , wherein when the identifier is a temporary identifier, the at least one processor provides the response to the HARQ process along with an indication of the retransmission.
12. An apparatus that facilitates utilizing hybrid automatic repeat/request (HARQ) communications in system access procedures, comprising:
means for receiving, at a device, a communication from an access point in response to a system access request;
means for determining whether a grant in the communication is associated with a new transmission or a retransmission based at least in part on a communication type; and
means for providing the communication to a HARQ process along with an indicator for the new transmission based at least in part on the determination and whether a buffer of the HARQ process comprises a response to a system access response.
13. The apparatus of claim 12 , wherein the communication is a random access response.
14. The apparatus of claim 13 , wherein the means for receiving a communication receives the communication over an established random access channel in response to a random access preamble transmitted over the established random access channel.
15. The apparatus of claim 12 , wherein the communication type is a control channel transmission.
16. The apparatus of claim 15 , wherein the means for providing the communication to a HARQ process further determines an identifier related to the apparatus specified in the communication.
17. The apparatus of claim 16 , wherein when the means for providing the communication to a HARQ process determines that the identifier is a temporary address related to the device, the means for providing provides the communication to the HARQ process along with an indication of the retransmission.
18. The apparatus of claim 12 , wherein the communication further comprises an identifier related to the HARQ process.
19. A computer program product, comprising:
a non-transitory computer-readable medium comprising:
code for causing at least one computer to receive, at a device, a communication comprising a grant of data channel resources from an access point in a wireless network;
code for causing the at least one computer to determine whether the grant in the communication is associated with a new transmission or a retransmission based at least in part on a communication type; and
code for causing the at least one computer to provide the communication to a hybrid automatic repeat/request (HARQ) process along with an indicator for the new transmission based on the determination and whether a buffer of the HARQ process comprises a response to a system access response.
20. The computer program product of claim 19 , wherein the communication is a random access response.
21. The computer program product of claim 20 , wherein the non-transitory computer-readable medium further comprises code for causing the at least one computer to transmit a random access request to the access point when switching from an idle mode to an active mode, wherein the communication is received in response to the random access request.
22. The computer program product of claim 19 , wherein the communication type is a control channel transmission and the non-transitory computer-readable medium further comprises code for causing the at least one computer to determine an identifier associated with the control channel transmission.
23. The computer program product of claim 22 , wherein when the identifier is a temporary address related to a device, the communication is provided to the HARQ process along with an indication of the retransmission.