Patent ID: 8064425

Claim:
A method for assigning frequency spectrum bandwidth of an OFDM and OFDMA coexistence system, and the coexistence system comprises a base station system, characterized in that the base station system combines uplink and downlink data containing an OFDM sub-frame and an OFDMA sub-frame in a time division fashion, constitutes a frame structure realizing the coexistence of the OFDM and the OFDMA, and assigns the frequency spectrum according to the different bandwidth requirements of the OFDM and the OFDMA and the use situation of the frequency band; when the total frequency bands of the OFDM and the OFDMA are the same and the bandwidths of the OFDM and the OFDMA are different, the method for assigning the frequency spectrum bandwidth of the system comprises the following steps: the base station system divides each data frame of the whole frequency band into a downlink OFDMA sub-frame and an uplink OFDMA sub-frame on the time axis, which are respectively for sending the OFDMA downlink data, and part of them is used for sending the OFDMA uplink data, wherein the said downlink OFDMA sub-frame also comprises an OFDMA preamble region; the base station system divides, in a OFDMA non-prefix downlink data region according to frequency assigned order, a region for transmitting the OFDM downlink sub-frame; and the base station system divides, in an OFDMA uplink data region according to the frequency assigned order, a region for transmitting the OFDM uplink sub-frame.