| 摘要 |
A method for avoiding control channels belonging to forbidden service providers during reselection in a wireless communications system includes checking the service provider of candidate control channels and setting a candidate ineligibility flag if the service provider is from a forbidden class. When reselection is triggered, due to the mere passage of time or some other condition, a neighbor list of control channels is filtered based on received signal strengths to create a viable neighbor list (VNL) of viable candidatae control channels. Each time a candidate control channel is selected from the viable neighbor list for examination, the service provider for the candidate control channel is identified. If the service provider is from a forbidden class, a candidate ineligibility flag is set for that control channel, and the channel is not camped on. Preferably, the candidate control channel is not examined further after the candidate ineligibility flag is set. If the candidate control channel fails, due to forbidden service provider, signal characteristics, or other factors, another candidate control channel is selected for examination from the viable neighbor list. In this manner, the mobile unit is prevented from camping on a control channel belonging to a forbidden service provider during reselection.
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