Low mobility states and procedures

• US 9,661,509 B2
• Filed: 04/01/2011
• Issued: 05/23/2017
• Est. Priority Date: 04/02/2010
• Status: Active Grant

• Current Assignee: DRNC Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Inventors: Pani, Diana, Cave, Christopher, Anepu, Bhaskar, Gomes, Sylvie
• Primary Examiner(s): RENNER, BRANDON M
• Application Number:
  US13/638,735
• Publication Number:
  US 20130188503A1
• Time in Patent Office: 2,244 Days
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 36/0085 Hand-off measurements
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 36/32 by location or mobility data, e.g. speed data
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 52/0212 managed by the network, e.g. network or access point is master and terminal is slave
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Mobility states are defined in order to prevent excess signaling overhead and to conserve power on a wireless transmit/receive unit (WTRU) in a wireless network. The WTRU may determine that is operating in a low mobility state based on triggers related to the frequency of movement of the WTRU between network cells. The WTRU may change cells less frequently in a low or no mobility state than in a normal mobility state. Upon determining that the WTRU is in the low or no mobility state, the WTRU may configure mobility procedures associated with the low or no mobility state in order to conserve power and other network resources. The WTRU may coordinate its mobility state with the network.

Claims

1. A method for optimizing utilization of network resources by changing a state of a machine type communication (MTC) device, the method comprising:

receiving, by the MTC device, a message directing the MTC device to change from a first state to a second state, the message being received from a cellular network node based on signaling from an MTC server, the signaling from the MTC server comprising an instruction to change the state of the MTC device from the first state to the second state; and

changing the MTC device from the first state to the second state in response to receiving the message, the MTC device configured to perform serving cell measurements and neighbor cell measurements less frequently in the second state as compared to the first state.

2. The method of claim 1, wherein, in the second state, the MTC device is further configured to stop neighbor cell measurements until serving cell measurements are below a predefined threshold.

3. The method of claim 1, wherein, in the second state, the MTC device is further configured to measure fewer neighbor cells as compared to the first state.

4. The method of claim 1, wherein, in the second state, the MTC device is further configured to perform cell reselection less frequently as compared to the first state.

5. The method of claim 1, wherein, in the second state, the MTC device is further configured to perform location area updates less frequently as compared to the first state.

6. The method of claim 1, wherein, in the second state, the MTC device is further configured to increase a length of a discontinuous reception (DRX) cycle.

7. The method of claim 1, wherein, in the second state, the MTC device is further configured to acquire system information less frequently as compared to the first state.

8. The method of claim 1, wherein the MTC server resides outside of a core network.

9. The method of claim 1, wherein the MTC device is configured to not perform serving cell measurements and neighbor cell measurements when in the second state.

10. A machine type communication (MTC) device comprising:

a processor configured to;

receive, by the MTC device, a message directing the MTC device to change from a first state to a second state, the message being received from a cellular network node based on signaling from an MTC server, the signaling from the MTC server comprising an instruction to change the state of the MTC device from the first state to the second state; and

change from the first state to the second state in response to receiving the message, the processor configured to perform serving cell measurements and neighbor cell measurements less frequently the second state as compared to the first state.

11. The MTC device of claim 10, wherein the processor is further configured to, in response to receiving the message, stop neighbor cell measurements until serving cell measurements are below a predefined threshold.

12. The MTC device of claim 10, wherein the processor is further configured to measure fewer neighbor cells in the second state as compared to the first state.

13. The MTC device of claim 10, wherein the processor is further configured to perform cell reselection less frequently in the second state as compared to the first state.

14. The MTC device of claim 10, wherein the processor is further configured to perform location area updates less frequently in the second state as compared to the first state.

15. The MTC device of claim 14, wherein the processor is further configured to increase a length of a discontinuous reception (DRX) cycle in the second state.

16. The MTC device of claim 10, wherein the processor is further configured to acquire system information less frequently in the second state as compared to the first state.

17. The MTC device of claim 10, wherein the MTC server resides outside of a core network.

18. The MTC device of claim 10, wherein the processor is configured to not perform serving cell measurements and neighbor cell measurements when in the second state.

19. A cellular network device comprising:

a processor configured to;

receive a signal from an MTC server, the signal indicating an MTC device and a first state, and the signal from the MTC server comprising an instruction to change the state of the MTC device from a second state to the first state;

transmit, in response to the signal, a message to the MTC device that triggers the MTC device to change from the second state to the first state, where the MTC device is configured to perform serving cell measurements and neighbor cell measurements less frequently in the first state as compared to the second state.

20. The network device of claim 19, wherein, when in the first state, the MTC device is further configured to stop neighbor cell measurements until serving cell measurements are below a predefined threshold.

21. The network device of claim 19, wherein, when in the first state, the MTC device is further configured to measure fewer neighbor cells as compared to the second state.

22. The network device of claim 19, wherein, when in the first state, the MTC device is further configured to perform cell reselection less frequently as compared to the second state.

23. The network device of claim 19, wherein, when in the first state, the MTC device is further configured to perform location area updates less frequently as compared to the second state.

24. The network device of claim 19, wherein, when in the first state, the MTC device is further configured to increase a length of a discontinuous reception (DRX) cycle.

25. The network device of claim 19, wherein, when in the first state, the MTC device is further configured to acquire system information less frequently as compared to the second state.

26. The network device of claim 19, wherein the MTC server resides outside of a core of the cellular network.

27. The network device of claim 19, wherein the MTC device is configured to not perform serving cell measurements and neighbor cell measurements when in the second state.

28. A method performed by a cellular network device, the method comprising:

receiving a signal from an MTC server, the signal indicating an MTC device and a first state, and the signal from the MTC server comprising an instruction to change the state of the MTC device from a second state to the first state;

transmitting, in response to the signal, a message to the MTC device that triggers the MTC device to change from the second state to the first state, where the MTC device is configured to perform serving cell measurements and neighbor cell measurements less frequently in the first state as compared to the second state.

29. The method of claim 28, wherein, when in the first state, the MTC device is configured to stop neighbor cell measurements until serving cell measurements are below a predefined threshold.

30. The method of claim 28, wherein, when in the first state, the MTC device is configured to measure fewer neighbor cells as compared to the second state.

31. The method of claim 28, wherein, when in the first state, the MTC device is configured to perform cell reselection less frequently as compared to the second state.

32. The method of claim 28, wherein, when in the first state, the MTC device is configured to perform location area updates less frequently as compared to the second state.

33. The method of claim 28, wherein, when in the first state, the MTC device is configured to increase a length of a discontinuous reception (DRX) cycle.

34. The method of claim 28, wherein, when in the first state, the MTC device is configured to acquire system information less frequently as compared to the second state.

35. The method of claim 28, wherein, when in the first state, the MTC device is configured to not perform serving cell measurements and neighbor cell measurements.

36. The method of claim 28, wherein the MTC server resides outside of a core network.