초록 ▼

A relative time offset is measured between transmission of a downlink signal from a cellular radio network base station, and a reference signal (e.g., sync word) included in an uplink signal received at the base station from a network subscriber. If the measured time offset is within a determined ra

A relative time offset is measured between transmission of a downlink signal from a cellular radio network base station, and a reference signal (e.g., sync word) included in an uplink signal received at the base station from a network subscriber. If the measured time offset is within a determined range, the uplink signal is judged to originate from a subscriber which is validly assigned to the base station, and the base station will continue to track the valid uplink signal. If the relative time offset is outside the determined range, the uplink signal is judged invalid, e.g., to originate from an interfering co-channel subscriber assigned to a remote base station. The receiving base station will then inhibit tracking of the invalid uplink signal.

대표청구항 ▼

A method of validating an uplink signal received at a base station of a cellular radio communications network, comprising: defining a downlink time slot during which a base station assigned to a subscriber transmits a downlink signal for reception by the subscriber; including in said downlink signal

A method of validating an uplink signal received at a base station of a cellular radio communications network, comprising: defining a downlink time slot during which a base station assigned to a subscriber transmits a downlink signal for reception by the subscriber; including in said downlink signal a defined reference signal at a certain time relative to the downlink time slot; defining an uplink time slot during which the subscriber transmits an uplink signal for reception at a base station; including in said uplink signal a defined reference signal at a certain time relative to the uplink time slot; measuring a time offset between transmission from the base station of a reference signal associated with a downlink time slot and reception of a reference signal associated with an uplink time slot; determining if said time offset is within a determined range; and processing the uplink signal as valid only if said time offset is within said determined range.