Uplink resource allocation to control intercell interference in a wireless communication system

摘要

Embodiments of the present invention exploit the reciprocity of radio channels in TDD, and longer-term correlation between average uplink and downlink path losses in FDD wireless communication systems to enable distributed schedulers in an enhanced uplink system to allocate uplink transmission resources while preemptively managing intercell interference levels. Each cell's base station transmits a downlink reference signal at a known transmission power level. A mobile station monitors the received signal strength of the downlink reference signals from multiple base stations. The transmitted and received signal strength levels can be used by the mobile station to estimate the amount of intercell interference that the mobile station's uplink transmissions cause, and the mobile station's uplink transmission parameters are adjusted accordingly. In further embodiments, the received reference signal power levels, or values derived therefrom, are transmitted by the mobile station to its serving base station, where a scheduling algorithm uses the information to adjust one or more transmission parameters relating to a grant of uplink transmission resources to the UE, thereby controlling the intercell interference generated by the mobile station's uplink transmissions.

主权项

1. A mobile station for a time division duplex based wireless communication system, comprising:
means for receiving a plurality of reference signal transmissions transmitted at a respective plurality of transmission power levels by a serving base station and at least one of neighboring base stations; means for measuring a plurality of received signal power levels for the respective plurality of reference signal transmissions; means for determining a radio propagation condition between the mobile station and the serving base station and radio propagation conditions between the mobile station and the at least one of neighboring base stations; means for generating a metric derived from the radio propagation condition between the mobile station and the serving base station and at least one of the radio propagation conditions between the mobile station and the at least one of neighboring base stations; means for conveying the metric to the serving base station to assist uplink resource allocation; and means for estimating a composite received signal power level, the composite received signal power level being a power level of a composite signal comprising the reference signal transmission transmitted at the serving base station and the reference signal transmission transmitted at the at least one of neighboring base stations, wherein the metric is derived based on a received power level of the serving base station and an estimate of a residual power level, the residual power level being a difference of the composite received signal power level and the received power level of the serving base station.