Method for controlling channel re-selection from a selected control channel to an alternative control channel

• US 5,995,834 A
• Filed: 12/24/1996
• Issued: 11/30/1999
• Est. Priority Date: 12/24/1996
• Status: Expired due to Term

• Current Assignee: AT&T Mobility II LLC (AT&T, Inc.)
• Original Assignee: AT&T Wireless Services Incorporated (AT&T, Inc.)
• Inventors: Moore, Michael P.
• Primary Examiner(s): CUMMING, WILLIAM D
• Application Number:
  US08/772,829
• Time in Patent Office: 1,071 Days
• Field of Search: 455/435, 455/455, 455/434, 455/429, 455/522, 455/454, 455/452, 455/453
• US Class Current: 455/434
• CPC Class Codes: H03J 1/005 in a loop
• CPC Class Codes: H03J 1/0091 provided with means for scanning over a band of frequencies H03J1/0058 takes precedence
• CPC Class Codes: H04W 36/06 Reselecting a communication resource in the serving access point

Abstract

A method for re-selecting control channels in a mobile station reduces the use of resources by limiting an evaluation of candidate control channels to those channels which satisfy certain criteria and are deemed to be eligible control channels. As a consequence, resources are not spent on attempting to re-select a control channel that is not compatible with the mobile station.

Claims

1. In a wireless communication environment in which a mobile station camps on to a selected control channel and can select an alternative control channel on which to attempt to camp, a method comprising the steps of:

receiving a list of candidate control channels at the mobile station over the control channel on which the mobile station is currently camped;

analyzing said list to determine a primary candidate channel for re-selection;

attempting to re-select said primary candidate channel;

if the attempt to re-select fails because the primary candidate channel corresponds to a private system to which the mobile station is not permitted access, then marking the primary candidate channel as ineligible for re-selection such that during a subsequent attempt to re-select the control channel marked as ineligible is not considered.

2. The method of claim 1 wherein a candidate control channel is marked as ineligible in said list if it is associated with a private system, said step of analyzing further comprising the steps of:

determining if a candidate control channel has been marked ineligible; and

considering only those control channels that have not been marked ineligible.

3. The method of claim 1 wherein a control channel is marked as private in said list of candidate control channels if it is associated with a private system, said step of analyzing further comprising the steps of:

determining if a candidate control channel is marked as private in said list of potential control channels; and

considering said control channel for re-selection only if said mobile station has a private system identification stored in a memory.