Transmitting a scheduling request based on a triggered buffer status report
A wireless device receives a radio resource control message. The radio resource control message comprises a periodicity of uplink resources of an uplink configured periodic grant. A buffer status report (BSR) for transmission is triggered in response to data becoming available for uplink transmission. The BSR indicates a size of the data. Based on the triggering of the BSR, an uplink scheduling request is triggered in response to receiving no additional resource for uplink transmission while the uplink resources for the uplink configured periodic grant are available. The scheduling request is transmitted.
1. A method by a wireless device, comprising:
receiving a radio resource control message comprising information about uplink resources of a grant-free transmission and a pre-determined threshold;
receiving a message comprising an activation indicator of the grant-free transmission;
activating an uplink resource of the grant-free transmission based on the activation indicator and the radio resource control message;
identifying whether a size of data for uplink transmission is larger than the pre-determined threshold;
in response to the size of the data being larger than the pre-determined threshold:
multiplexing a buffer status report (BSR) onto at least one first packet, and transmitting the at least one first packet via the uplink resource of the grant-free transmission based on the information, wherein the BSR indicates the size of the data; and
in response to the size of the data being lower than or equal to the pre-determined threshold:
transmitting at least one second packet via the uplink resource of the grant-free transmission based on the information, without multiplexing of the BSR onto at least one second packet.
2. The method of claim 1 , wherein the information about the uplink resources comprises a periodicity of the uplink resources, a timing offset and a symbol number for identifying each of the uplink resources of the grant-free transmission.
3. The method of claim 2 , wherein the grant-free transmission:
starts from a first symbol based on:
the timing offset and the symbol number; and
reoccurs with the periodicity.
4. The method of claim 2 , wherein the periodicity indicates a timer interval between two subsequent uplink resources of the grant-free transmission.
5. The method of claim 1 , wherein the radio resource control message comprises at least one parameter indicating that the grant-free transmission can be used for data transmission.
6. The method of claim 1 , wherein the BSR is a regular BSR.
7. The method of claim 1 , further comprising receiving no uplink grant of an additional resource based on transmitting the BSR.
8. A wireless device comprising:
a transceiver;
one or more processors; and
a memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
control the transceiver to receive a radio resource control message comprising information about uplink resources of a grant-free transmission and a pre-determined threshold,
receive a message comprising an activation indicator of the grant-free transmission,
activate an uplink resource of the grant-free transmission based on the activation indicator and the radio resource control message,
identify whether a size of data for uplink transmission is larger than the pre-determined threshold,
in response to the size of the data being larger than the pre-determined threshold:
multiplex a buffer status report (BSR) onto at least one first packet, and transmit the at least one first packet via the uplink resource of the grant-free transmission based on the information, wherein the BSR indicates the size of the data, and
in response to the size of the data being lower than or equal to the pre-determined threshold:
control the transceiver to transmit at least one second packet via the uplink resource of the grant-free transmission based on the information, without multiplexing of the BSR onto at least one second packet.
9. The wireless device of claim 8 , wherein the information about the uplink resources comprises a periodicity of the uplink resources, a timing offset and a symbol number for identifying each of the uplink resources of the grant-free transmission.
10. The wireless device of claim 9 , wherein the grant-free transmission:
starts from a first symbol based on:
the timing offset and the symbol number; and
reoccurs with the periodicity.
11. The wireless device of claim 9 , wherein the periodicity indicates a timer interval between two subsequent uplink resources of the grant-free transmission.
12. The wireless device of claim 8 , wherein the radio resource control message comprises at least one parameter indicating that the grant-free transmission can be used for data transmission.
13. The wireless device of claim 8 , wherein the BSR is a regular BSR.
14. The wireless device of claim 8 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive no uplink grant of an additional resource based on transmitting the BSR.