Methods and systems for scheduling resources in a telecommunication system
View Patent ↗Aspects of the present invention relate to the scheduling of resources in a telecommunication system that includes a mobile terminal and base station. In one embodiment, the mobile terminal sends an initial scheduling request to a base station. Subsequently, the mobile terminal does not transmit a scheduling request to the base station unless and until a scheduling request triggering event is detected.
1. A method for transmitting scheduling requests from a mobile terminal to a base station, the method comprising:
receiving a first scheduling grant from the base station;
transmitting a buffer status report to the base station in response to the first scheduling grant;
receiving a HARQ ACK from the base station for the first scheduling grant;
receiving second data for transmission to the base station while first data is waiting to be transmitted to the base station;
triggering transmission of a second scheduling request (SR) to the base station only if the mobile terminal lacks an uplink grant to transmit the second data and a buffer status of the mobile terminal has changed since a last acknowledged buffer status report from the mobile terminal to the base station; and
cancelling the second scheduling request if a scheduling grant is received from the base station before the second scheduling grant has been transmitted.
2. The method according to claim 1 , wherein a change in the buffer status of the mobile terminal comprises higher priority data arriving in the buffer.
3. The method according to claim 1 , wherein a change in the buffer status of the mobile terminal comprises an amount of time that has elapsed since the first SR was transmitted exceeds a threshold.
4. The method according to claim 1 , wherein a change in the buffer status of the mobile terminal comprises a difference between a current amount of data in a buffer and a previous and non-zero amount of data that was in the buffer exceeds a threshold.
5. The method of claim 1 , further comprising:
responsive to an absence of a change in the buffer status, transmitting a message to the base station indicating that the buffer status has not changed.
6. The method according to claim 5 , wherein the message is a one bit message.
7. The method according to claim 5 , wherein the message is transmitted at a next opportunity.
8. The method according to claim 1 , wherein the first and the second SR are sent on one of a scheduling request channel or a random access channel.
9. The method of claim 1 , further comprising:
transmitting the first scheduling request in response to receiving the first data into an empty buffer.
10. A mobile terminal, comprising:
a data processor;
a buffer in communication with the data processor, wherein the buffer stores second data to be transmitted to a base station;
a storage unit in communication with the data processor, wherein the storage unit stores a last acknowledged buffer status report transmitted to the base station;
a transceiver in communication with the data processor, wherein the transceiver receives a first scheduling grant from the base station and transmits a buffer status report to the base station in response to the first scheduling grant, and wherein the transceiver further receives a HARQ ACK from the base station for the buffer status report, and
wherein the data processor triggers transmission of a second scheduling request (SR) to the base station only if:
the mobile terminal lacks an uplink grant to send the second data,
the second data was received for transmission to the base station while first data is waiting to be transmitted to the base station, and
a buffer status of the mobile terminal has changed since the last acknowledged buffer status report from the mobile terminal to the base station, and wherein the last acknowledged buffer status report was sent after a first scheduling request (SR) is transmitted to the base station; and
wherein the data processor cancels the second scheduling request (SR) if a scheduling grant is received from the base station before the second scheduling grant has been transmitted.
11. The mobile terminal according to claim 10 , wherein a change in the buffer status of the mobile terminal comprises higher priority data arriving at the buffer.
12. The mobile terminal according to claim 10 , wherein a change in the buffer status of the mobile terminal comprises an amount of time that has elapsed since the first SR was transmitted exceeds a threshold.
13. The mobile terminal according to claim 10 , wherein a change in the buffer status of the mobile terminal comprises a difference between a current amount of data in the buffer and a previous and non-zero amount of data that was in the buffer exceeds a threshold.
14. The mobile terminal of claim 10 , wherein the data processor causes the transceiver to transmit the first scheduling request in response to receiving first data into the buffer when the buffer was empty.
15. The mobile terminal of claim 10 , wherein the data processor causes the transceiver to transmit a message to the base station indicating that the buffer status has not changed in response to an absence of a change in the buffer status.
16. The mobile terminal according to claim 15 , wherein the message indicating that the buffer status has not changed is a one bit message.
17. The mobile terminal according to claim 15 , wherein the message is transmitted at a next opportunity.