Rate prediction in fractional reuse systems

摘要

Apparatus and methods for rate prediction in a wireless communication system having fractional frequency reuse are disclosed. A wireless communication system implementing Orthogonal Frequency Division Multiple Access (OFDMA) can implement a fractional frequency reuse plan where a portion of carriers is allocated for terminals not anticipating handoff and another portion of the carriers is reserved for terminals having a higher probability of handoff. Each of the portions can define a reuse set. The terminals can be constrained to frequency hop within a reuse set. The terminal can also be configured to determine a reuse set based on a present assignment of a subset of carriers. The terminal can determine a channel estimate and a channel quality indicator based in part on at least the present reuse set. The terminal can report the channel quality indicator to a source, which can determine a rate based on the index value.

主权项

1. A method for rate control in a fractional reuse communication system, the method comprising:
determining a subcarrier assignment within a reuse set, the subcarrier assignment including at least one subcarrier of a plurality of subcarriers encoding data in parallel for transmission; determining a transmission format based in part on a received channel quality indicator that is responsive to a pilot signal and the subcarrier assignment, the channel quality indicator being reported by a corresponding mobile station based on an identification of the reuse set as being associated with the subcarrier assignment; and controlling a code rate based in part on the transmission format.