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 method for allocating uplink transmission resources in a time division duplex based wireless communication system, the method comprising:
receiving, by a mobile station, reference signals transmitted by a serving station and at least one of neighboring base stations; measuring, by the mobile station, received signal power levels for the respective reference signals; determining, by the mobile station, 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 and calculating, by the mobile station, a corresponding metric; transmitting, by the mobile station, the metric to the serving base station; and receiving, by the mobile station, an allocation of uplink transmission resources in response to the metric, wherein the metric includes a ratio of 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 neighboring base stations, the uplink transmission resources include at least one of data rate, uplink transmission power, degree or nature of forward error correction, modulation format, and code resource usage, and the radio propagation conditions are path gains or path losses, and the metric comprises a ratio of a path gain or path loss of the serving base station and path gains or path losses of the respective neighboring base stations.