Methods and systems for scheduling resources in a telecommunication system

• US 8,437,293 B2
• Filed: 12/19/2007
• Issued: 05/07/2013
• Est. Priority Date: 06/19/2007
• Status: Active Grant

• Current Assignee: Optis Cellular Technology LLC (Brevet Capital)
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Moberg, Peter, Englund, Eva, Jersenius, Kristina, Wiemann, Henning, Larmo, Anna
• Primary Examiner(s): Choi, Eunsook
• Application Number:
  US12/664,962
• Publication Number:
  US 20100202420A1
• Time in Patent Office: 1,966 Days
• Field of Search: None
• US Class Current: 370/329
• CPC Class Codes: H04J 11/00 Orthogonal multiplex systems, e.g. using WALSH codesH04J13/00 takes precedence
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/6275 based on priority
• CPC Class Codes: H04W 28/0278 using buffer status reports dynamic wireless traffic scheduling definition H04W72/12
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/56 based on priority criteria
• CPC Class Codes: H04W 72/569 of the traffic information
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

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.

Claims

1. A method for transmitting scheduling requests from a mobile terminal to a base station, the method comprising:

(a) transmitting a first scheduling request (SR) from the mobile terminal to the base station in response to first data becoming available for transmission from the mobile terminal to the base station;

(b) after transmitting the first SR, receiving at the mobile terminal a scheduling grant (SG) transmitted from the base station;

(c) in response to receiving the SG, transmitting from the mobile terminal to the base station transmit buffer status information; and

(d) while at least some of the first data is waiting to be transmitted to the base station and after transmitting the buffer status information, but prior to transmitting any subsequent SRs to the base station, further performing the steps of;

(d1) determining whether a scheduling request triggering event has occurred; and

(d2) if a triggering event has occurred, then, in response to determining that the triggering event has occurred, at a next opportunity, transmitting a second SR to the base station.

2. The method according to claim 1, wherein the step of determining whether a scheduling request triggering event has occurred comprises comparing the transmit buffer status information transmitted to the base station with new information concerning the status of the transmit buffer.

3. The method according to claim 1, wherein the step of determining whether a scheduling request triggering event has occurred comprises determining whether second data that is available for transmission from the mobile terminal to the base station has a higher priority than the first data, wherein the second data became available for transmission to the base station after the first SR was transmitted.

4. The method according to claim 1, wherein the step of determining whether a scheduling request triggering event has occurred comprises determining whether the amount of time that has elapsed since the first SR was transmitted exceeds a threshold.

5. The method according to claim 1, wherein the step of determining whether a scheduling request triggering event has occurred comprises determining whether the difference between the current amount of data in a transmit buffer and a previous, non-zero amount of data that was in the transmit buffer exceeds a threshold.

6. The method of claim 1, wherein the step of determining whether a scheduling request triggering event has occurred consists of:

(a) determining whether second data that became available for transmission to the base station after the first SR was transmitted has a higher priority than the first data;

(b) determining whether the amount of time that has elapsed since the first SR was transmitted exceeds a threshold; and

(c) determining whether the difference between the current amount of data in a transmit buffer and a previous, non-zero amount of data that was in the transmit buffer exceeds a threshold.

7. The method of claim 1, wherein the step of determining whether a scheduling request triggering event has occurred consists of:

(a) determining whether second data that became available for transmission to the base station after the first SR was transmitted has a higher priority than the first data; and

(b) determining whether the amount of time that has elapsed since the first SR was transmitted exceeds a threshold.

8. The method according to claim 1, wherein the SR is a one bit message.

9. The method according to claim 1, wherein the thresholds are configured in the mobile terminal by the base station through radio resource control (RRC) signaling.

10. The method according to claim 1, further comprising transmitting an SR at a next available opportunity every time that data arrives to an empty transmit buffer in the mobile terminal.

11. The method according to claim 1, further comprising receiving at the mobile terminal a HARQ ACK transmitted from the base station after transmitting from the mobile terminal to the base station the transmit buffer status information and storing the ACK in the mobile terminal.

12. A mobile terminal, comprising:

a transmit buffer; and

a data processor, wherein the data processor is configured to;

(a) cause the mobile terminal to transmit a first scheduling request (SR) to a base station in response to data arriving at an empty transmit buffer in the mobile terminal;

(b) cause the mobile terminal to transmit to the base station transmit buffer status information in response to receiving a scheduling grant (SG) from the base station; and

(c) perform steps (c1)-(c2) while at least some of the first data is waiting to be transmitted to the base station and after transmitting the buffer status information, but prior to transmitting any subsequent SRs to the base station;

(c1) determine whether a scheduling request triggering event has occurred; and

(c2) cause the mobile terminal transmit a second SR to the base station at a next opportunity in response to determining that a triggering event has occurred.

13. The mobile terminal according to claim 12, wherein the data processor is configured to determine whether a scheduling request triggering event has occurred by comparing the transmit buffer status information transmitted to the base station with new information concerning the status of the transmit buffer.

14. The mobile terminal according to claim 12, wherein the data processor is configured to determine whether a scheduling request triggering event has occurred by determining whether second data that became available for transmission to the base station after the first SR was transmitted has a higher priority than the first data.

15. The mobile terminal according to claim 12, wherein the data processor is configured to determine whether a scheduling request triggering event has occurred by determining whether the amount of time that has elapsed since the first SR was transmitted exceeds a threshold.

16. The mobile terminal according to claim 12, wherein the data processor is configured to determine whether a scheduling request triggering event has occurred by determining whether the difference between the current amount of data in a transmit buffer and a previous, non-zero amount of data that was in the transmit buffer exceeds a threshold.

17. The mobile terminal according to claim 12, wherein the message indicating that a triggering event has not occurred is a one bit message.

18. The mobile terminal according to claim 12, wherein the SR is a one bit message.

19. A communication system comprising a mobile terminal according to claim 12.

20. A mobile terminal, comprising:

(a) means for transmitting a first scheduling request (SR) to a base station in response to an empty transmit buffer in the mobile terminal receiving data;

(b) means for receiving a scheduling grant (SG) transmitted from the base station;

(c) means for transmitting to the base station transmit buffer status information in response to receiving the SG;

(d) triggering event detection means for determining whether a scheduling request triggering event has occurred, wherein the triggering event detection means is configured to perform the determination while at least some of the data is waiting to be transmitted to the base station; and

(e) means for transmitting to the base station, at a next opportunity, a second SR in response to determining that a scheduling request triggering event has occurred.

21. The mobile terminal according to claim 20, wherein triggering event detections means comprises means for comparing the transmit buffer status information transmitted to the base station with new information concerning the status of the transmit buffer.

22. The mobile terminal according to claim 20, wherein the triggering event detections means comprises means for determining whether second data that is available for transmission from the mobile terminal to the base station has a higher priority than the first data, wherein the second data became available for transmission to the base station after the first SR was transmitted.

23. The mobile terminal according to claim 20, wherein the triggering event detections means comprises means for determining whether the amount of time that has elapsed since the first SR was transmitted exceeds a threshold.

24. The mobile terminal according to claim 20, wherein the triggering event detections means comprises means for determining whether the difference between the current amount of data in a transmit buffer and a previous, non-zero amount of data that was in the transmit buffer exceeds a threshold.