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.

主权项

1. A method for operating user equipment in order to reselect from a first base station that uses a first wireless communication standard to a second base station that uses a second wireless communication standard, the method comprising:
while camping on the first base station:
in response to receiving a request for a data transfer, performing the data transfer according to the first wireless communication standard using the first base station;in response to transitioning to a non-active protocol state after completing the data transfer, performing a first measurement of a signal strength of the second base station, and determining if the second base station satisfies one or more reselection criteria based at least on (a) a comparison of the first measurement to a power threshold and (b) a time value associated with reselection;in response to determining that the second base station satisfies the one or more reselection criteria, reselecting to the second base station to enable data transfers with the second base station according to the second wireless communication standard.