METHOD, TERMINAL, AND SYSTEM FOR CELL RESELECTION

• US 20110034169A1
• Filed: 10/12/2010
• Published: 02/10/2011
• 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: Xie, Boyun, Johansson, Johan, ROBERTS, Michael, Huang, Min
• Granted Patent: US 8,412,197 B2
• Time in Patent Office: Days
• US Class Current: 455/435.3
• 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 36/24 Reselection being triggered by specific parameters
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service

Abstract

A method, terminal, and system for cell reselection are disclosed. The method includes: a terminal obtains a dedicated priority list from a first system; and performs cell reselection according to the dedicated priority list when the terminal camps on a cell of a second system. The corresponding terminal and system are also provided in other embodiments of the invention. According to an embodiment of the invention, the terminal performs cell reselection by using the dedicated priority list obtained from the first system so as to free the second system from establishing the dedicated priority list. Problems in the prior arts that establishment of the dedicated priority list causes too much increased signaling and too high costs for network upgrade are solved.

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 system; and

performing, by the terminal, cell reselection according to the dedicated priority list and the valid time of the dedicated priority list, when the terminal camps on a cell of a second system.

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

3. The method according to claim 2, wherein the method further comprises:

when the terminal camps on a cell of the non-LTE system, the performing cell reselection according to the dedicated priority list and the valid time comprises;

performing, by the terminal camping on the cell of the non-LTE system, cell reselection according to the dedicated priority list before the valid time expires.

4. The method according to claim 2, wherein when the terminal camps on the cell of the non-LTE system, the dedicated priority list is invalid after the valid time expires, the method further comprises:

performing cell reselection according to a public priority list, or

performing cell reselection according to a result measured in accordance with a cell signal quality criterion, or

searching for a cell of the LTE system.

5. The method according to claim 4, wherein when the public priority list is obtained by the terminal from the LTE system, the method further comprises:

obtaining, by the terminal, an indication from the non-LTE system when the terminal camps on the cell of the non-LTE system, wherein the indication is used to notify the terminal that the non-LTE system will not deliver the public priority list, and/or notify the terminal to store the public priority list obtained from the LTE system.

6. The method according to claim 2, further comprising:

obtaining, by the terminal, an indication from the non-LTE system, wherein the indication is used to notify the terminal at least one of the following;

searching for a cell of the LTE system when the dedicated priority list is invalid;

searching for a cell of the LTE system when the terminal does not store the dedicated priority list and the public priority list; and

performing cell reselection according to a result measured in accordance with a cell signal quality criterion when the terminal does not store the dedicated priority list and the public priority list.

7. The method according to claim 2, wherein the dedicated priority list and the valid time of the dedicated priority list are carried in a dedicated signaling.

8. The method according to claim 2, wherein the dedicated priority list comprises priority level information of different Radio Access Technologies (RATs).

9. A terminal, comprising:

a first obtaining unit, configured to obtain a dedicated priority list and a valid time of the dedicated priority list from a first system;

a first storage, configured to store the dedicated priority list and the valid time of the dedicated priority list; and

a first processing unit, configured to perform cell reselection according to the dedicated priority list and the valid time of the dedicated priority list stored in the first storage when the terminal camps on a second system.

10. The terminal according to claim 9, further comprising:

a second obtaining unit, configured to obtain a public priority list from the first system;

a second storage, configured to store the public priority list; and

a second processing unit, configured to perform cell reselection according to the public priority list stored in the second storage when the terminal camps on the second system and the first storage does not store a valid dedicated priority list.

11. The terminal according to claim 9, wherein the first processing unit is further configured to perform the cell reselection according to the dedicated priority list before the valid time expires, when the terminal camps on a cell of the non-LTE system.

12. The terminal according to claim 9, wherein the first system is a Long Term Evolution (LTE) system and the second system is a non-LTE system.

13. The terminal according to claim 10, wherein the dedicated priority list and the valid time of the dedicated priority list are carried in a dedicated signaling.

14. The terminal according to claim 10, wherein the dedicated priority list comprises priority level information of different Radio Access Technologies (RATs).

15. A system, comprising a network-side device and a terminal according to claim 9, wherein the network-side device is configured to send the dedicated priority list.

16. The system according to claim 15, wherein the first system is a Long Term Evolution (LTE) system and the second system is a non-LTE system.

17. The system according to claim 15, wherein the dedicated priority list and the valid time of the dedicated priority list are carried in a dedicated signaling.

18. The system according to claim 15, wherein the dedicated priority list comprises priority level information of different Radio Access Technologies (RATs).

19. The system according to claim 15, wherein the terminal further comprises:

a second obtaining unit, configured to obtain a public priority list from the first system;

a second storage, configured to store the public priority list; and

a second processing unit, configured to perform cell reselection according to the public priority list stored in the second storage when the terminal camps on the second system and the first storage does not store a valid dedicated priority list.

20. The system according to claim 15, wherein the first processing unit is further configured to perform the cell reselection according to the dedicated priority list before the valid time expires, when the terminal camps on a cell of the non-LTE system.