초록 ▼

The invention relates to a radio system and a method of timing an interfrequency handover in a WCDMA cellular radio system where data transmission between a terminal equipment and a base station employs several adjacent alternative frequency bands, and which comprises several different base stations

The invention relates to a radio system and a method of timing an interfrequency handover in a WCDMA cellular radio system where data transmission between a terminal equipment and a base station employs several adjacent alternative frequency bands, and which comprises several different base stations the coverage areas of which overlap at least partly, the base stations utilizing frequency band groups that differ from one another and that are situated next to one another in the frequency range, in which system a terminal equipment communicates with a first base station on a first frequency band and measures the strength of a first signal it has received from the base station, and wherein the terminal equipment measures the strength of a second signal transmitted by a second base station on a second, adjacent frequency band. In order to perform a handover at a correct moment, the terminal equipment compares the measurement results of the first and the second signal, and if the second signal exceeds the first signal by a given threshold value, the terminal equipment signals a handover request to the first base station.

대표청구항 ▼

1. A method of timing an interfrequency handover in a WCDMA cellular radio system, wherein data transmission between terminal equipment and a base station employs several adjacent alternative frequency bands and which system comprises several different base stations the coverage areas of which overl

1. A method of timing an interfrequency handover in a WCDMA cellular radio system, wherein data transmission between terminal equipment and a base station employs several adjacent alternative frequency bands and which system comprises several different base stations the coverage areas of which overlap at least partly, and which base stations utilize frequency band groups that differ from one another and that are situated next to one another in the frequency range, said method comprising the steps of:communicating from the terminal equipment with a first base station on a first frequency band; measuring the strength of a first signal received from the first base station by a terminal equipment receiver at the terminal equipment; measuring at the terminal equipment the strength of a second signal transmitted by a second base station on a second, adjacent frequency band and received by the terminal equipment receiver; comparing the measurement results of the first and the second signal, and if the second signal exceeds the first signal by a given threshold value, signalling from the terminal equipment a handover request to the first base station, and wherein the given threshold value is equal to or less than the maximum value for the adjacent channel interference of the terminal equipment receiver.