Granted Patent B2

US 7,983,688 · App. 12/427,672 · Granted Jul 19, 2011

Abstract

Claims (43)

1. A method of operating a communication system, comprising:

receiving remote unit channel data from a remote unit via an air link, the remote unit channel data including data about a first portion of communication channels on which a call can be executed;

applying a channel selection method to the received remote unit channel data to select a communication channel from among the first portion of communication channels;

if the selection method successfully results in a channel selection from among the first portion of communication channels, executing the call on the selected communication channel selected from among the first portion of communication channels;

if the selection method fails to result in a channel selection from among the first portion of communication channels, transmitting a request to the remote unit for a different version of remote unit channel data;

receiving the different version of the remote unit channel data from a remote unit via the air link;

applying the channel selection method to the different version of the remote unit channel data to select a communication channel; and

executing the call on the communication channel selected using the different version of the remote unit channel data.

2. The method of claim 1 wherein the first portion of the communication channels are preferred communication channels.

3. The method of claim 1 wherein the different version of the remote unit channel data is a different version of remote unit channel data about the first portion of the communication channels.

4. The method of claim 1 wherein the different version of the remote unit channel data is remote unit channel data about a portion of the communication channels other than the first portion of the communication channels.

5. The method of claim 1 wherein the remote unit channel data is transmitted to the base station over a control channel.

6. The method of claim 1 wherein the remote unit channel data about the first portion of the communication channels includes the strength of signals transmitted on the first portion of communication channels.

7. A method of operating a base station in a wireless communication system, the method comprising:

receiving remote unit channel data from a remote unit via an air link, the remote unit channel data being generated at the remote unit and including data about a first portion of communication channels between the remote unit and the base station on which a call can be executed;

applying a channel selection method to the received remote unit channel data to select a communication channel from among the first portion of communication channels;

determining if the selection method successfully results in a channel selection from among the first portion of communication channels;

if the selection method successfully results in a channel selection from among the first portion of communication channels, transmitting a channel identifier associated with the selected communication channel to the remote unit before executing the call on the selected communication channel, waiting for the remote unit to contact the base station on the selected communication channel, and executing the call on the selected communication channel; and

if the selection method fails to result in a channel selection from among the first portion of communication channels, transmitting a request to the remote unit for a different version of remote unit channel data,

receiving the different version of the remote unit channel data from a remote unit via the air link,

applying the channel selection method to the different version of the remote unit channel data to select the communication channel,

transmitting a channel identifier associated with the communication channel selected using the different version of the remote unit channel data to the remote unit before executing the call on the communication channel selected using the different version of the remote unit channel data,

waiting for the remote unit to contact the base station on the communication channel selected using the different version of the remote unit channel data, and

executing the call on the communication channel selected using the different version of the remote unit channel data.

8. The method of claim 7 wherein the different version of the remote unit channel data is a different version of remote unit channel data about the first portion of the communication channels.

9. The method of claim 7 wherein the different version of the remote unit channel data is remote unit channel data about a portion of the communication channels other than the first portion of the communication channels.

10. A method of operating a base station in a wireless communication system, comprising:

executing a call with a remote unit on a first communication channel for at least a predetermined time interval;

determining whether the first communication channel has become undesirable;

if the first communication channel has become undesirable, receiving a hand off request from the remote unit;

receiving remote unit channel data from a remote unit, the remote unit channel data being generated at the remote unit and including data about a plurality of communication channels between the remote unit and the base station on which the executing call can be handed off;

applying a channel selection method to the received remote unit channel data to select a hand off communication channel from among the plurality of communication channels;

determining if the selection method successfully results in a channel selection from among the plurality of communication channels;

if the selection method successfully results in a channel selection from among the plurality of communication channels, transmitting to the remote unit a channel identifier associated with the selected hand off communication channel, and executing the hand off to continue executing the call on the selected hand off communication channel; and

if the selection method fails to result in a channel selection from among the plurality of communication channels, transmitting a request to the remote unit for a different version of remote unit channel data,

receiving the different version of the remote unit channel data from a remote unit via the air link,

applying the channel selection method to the different version of the remote unit channel data to select the hand off communication channel,

transmitting to the remote unit a channel identifier associated with the hand off communication channel selected using the different version of the remote unit channel data, and

executing the hand off to continue executing the call on the hand off communication channel selected using the different version of the remote unit channel data.

11. The method of claim 10 wherein determining whether the first communication channel has become undesirable comprises determining whether a signal strength on first communication channel has fallen below a threshold signal strength.

12. The, method of claim 10 wherein the remote unit channel data includes data about a first portion of the plurality of communication channels designated as preferred communication channels.

13. The method of claim 10 wherein the different version of the remote unit channel data is a different version of remote unit channel data about the plurality of communication channels.

14. The method of claim 10 wherein the different version of the remote unit channel data is remote unit channel data about a portion of the communication channels other than the plurality of communication channels.

Assignments (6)