Inserting virtual carrier in conventional OFDM host carrier in communications system

摘要

A base station communicating data to/from plural mobile terminals over plural OFDM sub-carriers within a coverage area. The base station allocates transmission resources provided by a first group of the plural OFDM sub-carriers within a first frequency band to mobile terminals of a first type and allocates transmission resources provided by a second group of the plural OFDM sub-carriers within a second frequency band to terminals of a second type, the second group being smaller than the first group and the second frequency band selected from within the first frequency band. The base station transmits control information including resource allocation information for terminals of the first type over a first bandwidth corresponding to the combined first and second groups of OFDM sub-carriers and transmits control information including resource allocation information for terminals of the second type over a second bandwidth corresponding to the second group of OFDM sub-carriers.

主权项

1. A base station that communicates with a plurality of terminals over a plurality of orthogonal frequency-division multiplexing (OFDM) sub-carriers within a coverage area provided by the base station, the base station comprising:
circuitry configured to
allocate transmission resources provided by a first group of the plurality of OFDM sub-carriers within first frequency resources to terminals of a first type;allocate transmission resources provided by a second group of the plurality of OFDM sub-carriers within second frequency resources to terminals of a second type, the second group being smaller than the first group and the second frequency resources being a component within the first frequency resources;transmit first control information with one or more first OFDM symbols over a first bandwidth corresponding to a combination of the first and second groups of the plurality of OFDM sub-carriers, the first control information comprising first resource allocation information for the terminals of the first type;transmit second control information with one or more second OFDM symbols over a second bandwidth corresponding to the second group of OFDM sub-carriers, the second control information comprising second resource allocation information for the terminals of the second type; andtransmit first data with one or more third OFDM symbols over the second bandwidth, whereinthe OFDM sub-carriers are transmitted using a sub-frame structure,the one or more first OFDM symbols are different from the one or more second OFDM symbols and the one or more third OFDM symbols, andthe one or more second OFDM symbols are different from the one or more third OFDM symbols.