Downlink observed time difference measurements

US6356763B1 · kind B1 · utility

Assignee

• Telefonaktiebolaget LM Ericsson (Publ) · SE

Inventors

• Ari Kangas · Uppsala, SE
• Erik Larsson · Linköping, SE
• Sven Fischer · Leipzig, DE
• Patrik Lundqvist · Encinitas, US
• Mats Cedervall · Bissenkamp, SE

Key dates

• Filing date: Nov 4, 1998
• Grant date: Mar 12, 2002
• Expiry date: Nov 4, 2018

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04W56/0075
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A mobile communication station in a wireless communication network is used to measure the respective times of arrival of radio signals respectively transmitted by a plurality of radio transmitters in the network. The mobile communication station is provided with real time difference information indicative of differences between a time base used by a radio transmitter serving the mobile communication station and respective time bases used by the other radio transmitters. The mobile communication station determines, in response to the real time difference information and relative to the time base used by the radio transmitter serving the mobile communication station, a plurality of points in time at which the respective radio signals are expected to arrive at the mobile communication station. For each radio signal, the mobile communication station monitors for arrival of the radio signal during a period of time after the point in time at which the radio signal is expected to arrive.