Apparatus and method for cell selection

• US 20060140117A1
• Filed: 12/29/2004
• Published: 06/29/2006
• Est. Priority Date: 12/29/2004
• Status: Abandoned Application

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Likiki, Varalakshmi, Krause, David J., Aerrabotu, Naveen
• Application Number:
  US11/025,157
• Publication Number:
  US 20060140117A1
• Time in Patent Office: Days
• US Class Current: 370/232
• CPC Class Codes: H04W 36/26 by agreed or negotiated communication parameters

Abstract

A method and apparatus for cell selection. A wireless communication device (110) can operate on a first cell (120). An expected data rate of a second cell (130) can be determined. The wireless communication device (110) can switch from the first cell (120) to the second cell (130) based on the expected data rate. The wireless communication device (110) may generate a prioritized active list of neighbor cells (130, 140, 150, 160) based on a signal strength measurement and data rate information.

Claims

1. A method in a wireless communication device comprising:

operating the wireless communication device on a first cell;

determining an expected data rate of a second cell; and

switching from the first cell to the second cell based on the expected data rate.

2. The method according to claim 1, further comprising:

generating a list of potential destination cells, the potential destination cells including the second cell, based on pilot strength measurements and based on the expected data rate of the potential destination cells; and

transmitting the list of potential destination cells.

3. The method according to claim 1, further comprising:

initiating an ongoing packet data communication; and

ascertaining the expected data rate of the second cell exceeds the current data rate of the first cell;

wherein switching further comprises switching from the first cell to the second cell while in the ongoing packet data communication.

4. The method according to claim 1, wherein the first cell and the second cell comprise one of a global system for mobile communication cell, a code division multiple access cell, a general packet radio service cell and a wireless local area network cell.

5. The method according to claim 1, wherein the device comprises a selective call receiver.

6. The method according to claim 1, further comprising:

receiving a neighbor list, the neighbor list including data rate information of the second cell, power head room information, and spreading factor information of the second cell; and

generating a prioritized list from the neighbor list based on a weighted data rate and a weighted signal strength.

7. The method according to claim 6, wherein generating a prioritized list further comprises statistically weighting the signal strength information and the data rate information to obtain an optimal cell that supports a high data rate compared to other cells in the neighbor list.

8. The method according to claim 6, wherein generating a prioritized list further comprises statistically weighting the signal strength information and the data rate information,

wherein the method further comprises ordering the neighbor list based on the statistically weighted signal strength information and the data rate information.

9. The method according to claim 1, further comprising receiving a handoff command instructing the device to handoff to the second cell.

10. The method according to claim 1, wherein switching from the first cell to the second cell further comprises:

releasing a link layer connection with a base station on the first cell;

disconnecting a physical channel on the first cell;

switching to a new assigned channel on the second cell; and

initiating the establishment of lower layer connections on the second cell.

11. A method in a wireless communication network comprising:

receiving a report including data rate information;

sending the data rate information to a communication device;

receiving a list including at least one potential handoff cell, the list based on the data rate information and signal strength information; and

sending a message indicating a handoff of the communication device to the potential handoff cell.

12. The method according to claim 11,

wherein receiving a list further comprises receiving a list including a plurality of potential handoff cells ordered at least partially based on the data rate information, and

wherein sending the message further comprises sending the message indicating a handoff of the communication device to a potential handoff cell based on the order of the potential handoff cells.

13. The method according to claim 11, wherein receiving a report further comprises continuously receiving reports including data rate information.

14. The method according to claim 11, wherein receiving a report further comprises periodically receiving the report.

15. The method according to claim 11, wherein sending the data rate information further comprises sending the data rate information when information regarding a neighboring cell exceeds a quality threshold.

16. The method according to claim 11, wherein sending the data rate information further comprises sending the data rate information when a data rate of a neighboring cell exceeds a data rate of a current cell on which the communication device is operating by a predetermined amount.

17. The method according to claim 16, wherein a neighbor cell comprises one of a cell on a same system as the current cell and a cell on a different system as the current cell.

18. The method according to claim 11, wherein sending the data rate information further comprises sending a neighbor list including the data rate information and radio related attributes to the communication device when an attribute in the network exceeds a threshold.

19. The method according to claim 18,

wherein the threshold is based on one of the expected data rate of a neighbor cell exceeding a threshold and a difference in supported data rates between two cells exceeding a threshold, and

wherein the threshold is configurable.

20. A wireless communication device comprising:

a transceiver configured to operate the wireless communication device on a first cell; and

a controller coupled to the transceiver, the controller including

a data rate determination module configured to determine an expected data rate of a second cell; and

a cell switch module configured to switch from the first cell to the second cell based on the expected data rate.

21. The wireless communication device according to claim 20,

wherein the controller further includes a list generation module configured to generate a list of potential destination cells, the potential destination cells including the second cell, based on pilot strength measurements and based on the expected data rate of the potential destination cells, and

wherein the transceiver is further configured to transmit the list of potential destination cells.

22. The wireless communication device according to claim 20, wherein the controller further includes a list generation module configured to generate a list of potential destination cells, the potential destination cells including the second cell, the list including information based on statistically weighting signal strength information and expected data rate information to obtain an optimal cell that supports a high data rate compared to other cells in the list of potential destination cells.

23. The wireless communication device according to claim 20, wherein the controller is configured to perform measurements on a periodic basis, and determine a best supported cell,

wherein the controller is further configured to perform an idle handoff procedure when a serving cell expected data rate decreases a predetermined amount.

24. The wireless communication device according to claim 20, wherein the controller is further configured to estimate a data download time based on the expected data rate.

25. The wireless communication device according to claim 20, wherein the controller is configured to receive directions to a cell with a better data rate than a current cell based on one of a location direction procedure and a global positioning system.