DYNAMIC TIME TO TRIGGER FOR UE MEASUREMENTS

• US 20100234014A1
• Filed: 03/10/2009
• Published: 09/16/2010
• Est. Priority Date: 03/10/2009
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: VIRKKI, Vesa, Pradas, Jose Luis
• Granted Patent: US 8,305,997 B2
• Time in Patent Office: Days
• US Class Current: 455/423
• CPC Class Codes: H04W 36/0088 Scheduling hand-off measurements
• CPC Class Codes: H04W 36/26 by agreed or negotiated communication parameters

Abstract

A method, apparatus, and system are described relating to at time when a wireless terminal reports an event to a network. An event to be reported to the network is detected by the wireless terminal. A communications condition affecting a communication between the wireless terminal and the network is determined, and based on the detected communications condition, a dynamic time-to-trigger period is adjusted so that the event is reported by the wireless terminal to the network before the time-to-trigger period expires.

Claims

1. A method relating to at time when a wireless terminal reports an event to a network, the method implemented in the wireless terminal comprising:

detecting an event to be reported to the network;

determining a communications condition affecting a communication between the wireless terminal and the network; and

based on the detected communications condition, adjusting a time-to-trigger period so that the event is reported by the wireless terminal to the network before the time-to-trigger period expires.

2. The method of claim 1, wherein the time to trigger value is provided to the wireless terminal from the network.

3. The method of claim 1, wherein the communications condition is a time sensitive report or request from the wireless terminal.

4. The method of claim 1, wherein the communications condition is a handover of a communication involving the wireless terminal.

5. The method of claim 4, further comprising:

estimating a time when the active connection may be dropped or lost because of the detected communication condition;

wherein the time-to-trigger period is reduced so that a channel reconfiguration message from the wireless terminal arrives at the network before the active connection is lost or dropped.

6. The method of claim 1, wherein the wireless terminal is engaged in an active connection with the network over a radio channel and the communications condition is a low quality radio channel.

7. The method of claim 1, further comprising:

determining a rate of change of a received signal parameter for a signal received from a base station currently serving the wireless terminal,

wherein the communications condition is a based on the determined rate of change.

8. The method of claim 7, further comprising:

estimating a time when the active connection may be dropped or lost because of the determined rate of change;

wherein the predetermined time period is reduced so that a radio channel reconfiguration message from the wireless terminal arrives at the network before the active connection is lost or dropped.

9. The method of claim 8, further comprising:

determining a round trip transmission time (RTT) associated with transmitting the event report to the network and receiving from the network the radio channel reconfiguration message;

determining a network processing delay associated with receiving the channel reconfiguration message and generating the channel reconfiguration message;

wherein the time-to-trigger period is reduced so that a total time associated with the reduced time-to-trigger period together with the round trip transmission time and the network processing delay is less than the estimated time when the active connection may be dropped or lost.

10. The method of claim 9, wherein the RTT is determined by the wireless terminal.

11. The method of claim 10, wherein the network processing delay or the RTT are received from the network.

12. The method of claim 1, wherein the adjustment to the time-to-trigger is received from the network.

13. Apparatus for use with a wireless terminal that reports an event to a network, comprising:

a detector arranged to detect an event to be reported to the network;

a controller arranged to;

determine a communications condition affecting a communication between the wireless terminal and the network; and

adjust a time-to-trigger period so that the event is reported by the wireless terminal to the network before the time-to-trigger period expires based on the detected communications condition.

14. The apparatus of claim 13, wherein the time to trigger value is provided to the wireless terminal from the network.

15. The apparatus of claim 13, wherein the communications condition is a time sensitive report or request from the wireless terminal.

16. The apparatus of claim 13, wherein the communications condition is a handover of a communication involving the wireless terminal.

17. The apparatus of claim 16, the controller further arranged to:

estimate a time when the active connection may be dropped or lost because of the detected communication condition;

reduce the time-to-trigger period so that a channel reconfiguration message from the wireless terminal arrives at the network before the active connection is lost or dropped.

18. The apparatus of claim 13, wherein the communications condition is a low quality radio channel for a radio channel carrying communications between the wireless terminal and the network.

19. The apparatus of claim 13, wherein the controller is arranged to:

determine a rate of change of a received signal parameter for a signal received from a base station currently serving the wireless terminal,

wherein the communications condition is a based on the determined rate of change.

20. The apparatus of claim 19, wherein the controller is arranged to:

estimate a time when the active connection may be dropped or lost because of the determined rate of change;

reduce the time-to-trigger period so that a radio channel reconfiguration message from the wireless terminal arrives at the network before the active connection is lost or dropped.

21. The apparatus of claim 20, wherein the controller is arranged to:

determine a round trip transmission time (RTT) associated with transmitting the event report to the network and receiving from the network the radio channel reconfiguration message;

determine a network processing delay associated with receiving the channel reconfiguration message and generating the channel reconfiguration message;

reduce the time-to-trigger period so that a total time associated with the reduced time-to-trigger period together with the round trip transmission time and the network processing delay is less than the estimated time when the active connection may be dropped or lost.

22. A network arranged for use with one or more wireless terminals as claimed in claim 13.

23. The network of claim 22, comprising a network node arranged to provide the network processing delay, the RTT, or the adjustment to the time-to-trigger to the wireless terminal.