Fast Reselection from a Current Cell to a Higher-Priority Cell in Wireless Communication

摘要

A method and mechanism for operating user equipment to enable efficient reselection from a first cell conforming to a first wireless standard to a second cell conforming to a second wireless standard. The second standard may require a higher transmission rate for packet-switched data than the first standard. While camping on the first cell, the user equipment makes measurements of received power from the second cell. A reselection timer is started when a measurement is detected that is sufficiently strong. In response to an access state transition to a non-active protocol state (such as UMTS-PCH), the UE saves the timer value. When data becomes available for transmission, an additional measurement is made on the second cell, and reselection to the second cell may be performed immediately if the additional measurement and the saved timer value pass one or more reselection criteria.