Random access associated with buffer status reporting
Wireless communications may comprise one or more random access procedures. A random access procedure may be associated with a buffer status report (BSR). The BSR report may be maintained based on one or more conditions associated with the RA procedure, such as awaiting a random access response, an ongoing RA delay trigger timer, and/or transmission of the BSR.
1. A method comprising:
receiving, by a wireless device, configuration parameters for random access (RA) associated with buffer status reporting;
based on data being available for uplink transmission, triggering buffer status reporting (BSR);
transmitting a message for an RA procedure associated with the BSR, wherein the message comprises:
a preamble; and
a medium access control control element (MAC CE) comprising a buffer status report; and
keeping the BSR triggered at least until after the earliest of:
receiving a response to the message; and
expiration of a random access response window.
2. The method of claim 1 , wherein the configuration parameters indicate a value of an RA delay trigger timer, and wherein the method further comprises:
based on the triggering the BSR, starting the RA delay trigger timer; and
initiating the RA procedure based on an expiry of the RA delay trigger timer.
3. The method of claim 1 , further comprising:
receiving an uplink grant before receiving the response to the message; and
transmitting, via the uplink grant, a second medium access control control element (MAC CE), associated with the BSR, indicating a quantity of the data; and
based on the transmitting the second MAC CE, stopping the RA procedure.
4. The method of claim 1 , wherein the keeping the BSR triggered comprises at least one of:
maintaining the BSR triggered;
keeping the BSR pending; or
storing the data in a buffer.
5. The method of claim 1 , further comprising:
receiving a response to the message; and
based on the receiving the response to the message, cancelling the BSR triggered.
6. The method of claim 1 , wherein the RA procedure is a 2-step RA procedure.
7. The method of claim 1 , wherein the transmitting the message comprises:
transmitting the preamble via at least one random access channel (RACH) resource indicated by the configuration parameters; and
transmitting the MAC CE via at least one physical uplink shared channel (PUSCH) resource indicated by the configuration parameters.
8. The method of claim 1 , wherein the MAC CE comprises a field indicating a quantity of the data being available for the uplink transmission.
9. The method of claim 1 , wherein the wireless device initiates the RA procedure based on uplink radio resource not being available for the uplink transmission.
10. A method comprising:
receiving, by a wireless device, configuration parameters for random access (RA) associated with buffer status reporting, wherein the configuration parameters comprise a value of a RA delay trigger timer;
based on data being available for uplink transmission, triggering buffer status reporting (BSR);
based on the triggering the BSR, starting the RA delay trigger timer;
based on an expiry of the RA delay trigger timer, initiating an RA procedure associated with the BSR; and
transmitting a message for the RA procedure, wherein the message comprises:
a preamble; and
a medium access control control element (MAC CE) comprising a buffer status report.
11. The method of claim 10 , further comprising keeping the BSR triggered at least until after the earliest of:
receiving a response to the message; and
expiration of a random access response window.
12. The method of claim 10 , wherein the RA procedure is a 2-step RA procedure.
13. The method of claim 10 , wherein the transmitting the message comprises:
transmitting the preamble via at least one random access channel (RACH) resource indicated by the configuration parameters; and
transmitting the MAC CE via at least one physical uplink shared channel (PUSCH) resource indicated by the configuration parameters.
14. The method of claim 10 , further comprising:
receiving a response to the message; and
based on the receiving the response to the message, cancelling the BSR triggered.
15. The method of claim 10 , further comprising:
receiving an uplink grant before receiving a response to the message; and
transmitting, via the uplink grant, a second medium access control control element (MAC CE), associated with the BSR, indicating a quantity of the data; and
based on the transmitting the second MAC CE, stopping the RA procedure.
16. The method of claim 10 , wherein the MAC CE associated with the BSR comprises a field indicating a quantity of the data being available for the uplink transmission.
17. A method comprising:
receiving, by a wireless device, configuration parameters for random access (RA) associated with buffer status reporting;
based on data being available for uplink transmission, triggering buffer status reporting (BSR);
transmitting a message for an RA procedure associated with the BSR, wherein the message comprises a preamble;
receiving an uplink grant before receiving a random access response corresponding to the preamble;
transmitting, via the uplink grant, a BSR medium access control control element (MAC CE) indicating a quantity of the data being available for the uplink transmission; and
based on the transmitting the BSR MAC CE, stopping the RA procedure.
18. The method of claim 17 , further comprising keeping the BSR triggered at least until after the earliest of:
receiving a response to the message; and
expiration of a random access response window.
19. The method of claim 17 , wherein the configuration parameters indicate a value of an RA delay trigger timer, and wherein the method further comprises:
based on the triggering the BSR, starting the RA delay trigger timer; and
initiating the RA procedure based on an expiry of the RA delay trigger timer.
20. The method of claim 17 , wherein the transmitting the message comprises:
transmitting the preamble via at least one random access channel (RACH) resource indicated by the configuration parameters; and
transmitting the BSR MAC CE via at least one physical uplink shared channel (PUSCH) resource indicated by the configuration parameters.