Method, terminal, and system for cell reselection

• US 10,051,540 B2
• Filed: 01/25/2016
• Issued: 08/14/2018
• Est. Priority Date: 04/09/2008
• Status: Active Grant

• Current Assignee: Beijing Jingshi Intellectual Property Management Company Limited
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Roberts, Michael, Johansson, Johan, Xie, Boyun, Huang, Min
• Primary Examiner(s): Patel, Mahendra
• Application Number:
  US15/005,852
• Publication Number:
  US 20160286453A1
• Time in Patent Office: 932 Days
• Field of Search: 4554353, 455436, 455449, 4554521, 455434, 455510, 455437, 370252, 370312, 370230
• CPC Class Codes: H04W 36/0055 Transmission or use of information for re-establishing the radio link
• CPC Class Codes: H04W 36/0061 of neighbour cell information
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface
• CPC Class Codes: H04W 36/24 Reselection being triggered by specific parameters
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service

Abstract

A method and terminal are disclosed for cell reselection. In the disclosure, the terminal obtains a dedicated priority list and a valid time of the dedicates priority list for cell reselection from a first communication system, such as a Long Term Evolution (LTE) system, when the terminal is in a cell of the fists communication system. In case that the the terminal camps on a cell of a second communication system, such as a non-LTE system (for example, a UMTS system), and before the valid time expire, the terminal performs cell reselection using the dedicated priority list.

Claims

1. A method for cell reselection comprising:

obtaining, by a terminal, a dedicated priority list and a valid time of the dedicated priority list from a first communication system, when the terminal is in a cell of the first communication system; and

performing, by the terminal when the terminal camps on a cell of a second communication system, cell reselection in accordance with the obtained dedicated priority list before the valid time expires.

2. The method of claim 1, wherein the first communication system is a Long Term Evolution (LTE) system, and the second communication system is a non-LTE system.

3. The method of claim 1, wherein the terminal obtains the dedicated priority list and the valid time through a dedicated signaling.

4. The method of claim 3, wherein the dedicated signaling is a Radio Resource Control (RRC) Connection Release message.

5. The method of claim 1, wherein after the valid time expires, the method comprises:

performing, by the terminal, cell reselection in accordance with a public priority list signaled in system broadcast information.

6. The method of claim 5, wherein the public priority list is obtained by the terminal from the second communication system.

7. The method of claim 1, wherein the valid time is controlled through a timer.

8. The method of claim 1, further comprising:

deleting, by the terminal, the dedicated priority list after the valid time expires.

9. The method of claim 1, wherein the dedicated priority list comprises priority information of different radio access technologies (RATs).

10. The method of claim 9, wherein the priority information comprises priority information of frequencies of the different RATs.

21. The method of claim 1, wherein the priority information comprises priority information of frequencies.

23. The method of claim 1, wherein the priority information comprises a frequency priority.

11. An apparatus comprising:

a receiver configured to obtain, when a terminal is in a cell of a first communication system, a dedicated priority list and a valid time of the dedicated priority list from the first communication system; and

a processor configured to perform cell reselection when the terminal camps on a cell of a second communication system in accordance with the obtained dedicated priority list before the valid time expires.

12. The apparatus of claim 11, wherein the first communication system is a Long Term Evolution (LTE) system, and the second communication system is a non-LTE system.

13. The apparatus of claim 11 wherein the receiver is configured to obtain the dedicated priority list and the valid time through a dedicated signaling.

14. The apparatus of claim 11, wherein receiver is configured to obtain the dedicated priority list and the valid time through a Radio Resource Control (RRC) Connection Release message.

15. The apparatus of claim 11, wherein after the valid time expires, the processor is configured to perform cell reselection in accordance with a public priority list signaled in system broadcast information.

16. The apparatus of claim 15, wherein the public priority list is obtained by the terminal from the second communication system.

17. The apparatus of claim 11, wherein the valid time is controlled through a timer.

18. The apparatus of claim 11, wherein the processor is further configured to delete the dedicated priority list after the valid time expires.

19. The apparatus of claim 11, wherein the dedicated priority list is configured to comprise priority information of different radio access technologies (RATs).

20. The apparatus of claim 19, wherein the priority information is configured to comprise priority information of frequencies of the different RATs.

22. The apparatus of claim 11, wherein the priority information comprises priority information of frequencies.

24. The apparatus of claim 11, wherein the priority information comprises frequency priority.

25. A method for cell reselection comprising:

obtaining, by a terminal in a cell of a first communication system, a dedicated priority list and a valid time of the dedicated priority list from the first communication system; and

camping, by the terminal, on a cell of a second communication system; and

performing, by the terminal, cell reselection in accordance with the obtained dedicated priority list before the valid time expires when the terminal camps.