Granted Patent B2

US 7,299,047 · App. 10/642,599 · Granted Nov 20, 2007

Abstract

Claims (32)

1. A method in a wireless communication system comprising:

activating a call recovery timer in response detecting an error condition on a current communication channel,

monitoring the current communication channel while establishing a new communication channel;

resetting the call recovery timer if good frames are received on the current communication channel;

establishing a new communication channel if the current communication channel is judged to potentially drop; and

dropping the current communication if the call recovery timer expires.

2. The method according to claim 1 , wherein establishing the new communication channel includes detecting the presence of at least a plurality of bad frames on the current communication channel.

3. The method according to claim 2 , wherein the cell recovery timer is activated once at least 12 bad frames are detected on the current communication channel.

4. The method according to claim 1 , wherein the call recovery timer is less than 5 seconds.

5. The method according to claim 1 , wherein establishing the new communication channel includes searching for a pilot channel on an active carrier.

6. The method according to claim 5 , wherein establishing the new communication channel further includes decoding a sync channel and at least one of a broadcast common channel and a paging channel.

7. The method according to claim 6 , further including using the new communication channel to continue a session on the current communication channel.

8. A method, comprising in a wireless communication system:

activating a call recovery timer in response detecting to an error condition on an active communication channel;

monitoring the error condition on the active communication channel;

establishing a simultaneous communication channel while the call recovery timer is active;

searching the simultaneous communications channel while continuing to monitor the active communication channel;

resetting the call recovery timer if good frames are received on the active communication channel; and

dropping the current communication channel if the call recovery timer expires.

9. The method according to claim 8 , further comprising:

establishing an active communication session on the simultaneous communication channel if the call recovery timer elapses.

10. The method according to claim 8 , wherein the call recovery timer is less than a fade timer.

11. The method according to claim 8 , wherein the call recovery timer is transmitted from a wireless system base station.

12. A method, comprising in a wireless communication system:

supplying specific session information to a new channel to assist a call recovery process, the call recovery process initiated by a call recovery timer in response to detecting an error condition on an active channel;

monitoring the active channel while establishing the new channel;

resetting the call recovery timer if good frames are received on the active channel; and

dropping the active channel if the call recovery timer expires.

13. The method according to claim 12 , further comprising:

receiving an origination message requesting voice communication with a user currently using the active channel.

14. The method according to claim 13 , further comprising:

authorizing voice communication with the user.

Assignments (9)