Patent ID: 8767522

Claim:
A communication method for a mobile station operating in accordance with a time frame structure that includes a plurality of frames, each frame containing a plurality of subframes, each subframe containing a plurality of time slots, each time slot containing a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols, the method comprising: receiving from a base station information about availability of a random access channel; transmitting a random access signal over the random access channel within an uplink frequency band, wherein the random access signal contains a code sequence associated with a chip rate, the code sequence designated to the base station and the chip rate being a fraction of a system sampling rate; and the random access signal has a time duration longer than multiple of the OFDM symbols; receiving an acknowledgement to the random access signal from the base station, the acknowledgement carrying an identifier associated with the mobile station; and transmitting an OFDM signal over a control channel at the system sampling rate and within the uplink frequency band.