초록 ▼

A CDMA communication system supports underlay transmissions and direct spread overlay transmissions such that the overlay transmissions are at least partially orthogonal to underlay transmissions. A base station supports both the underlay transmissions and the overlay transmissions and includes an i

A CDMA communication system supports underlay transmissions and direct spread overlay transmissions such that the overlay transmissions are at least partially orthogonal to underlay transmissions. A base station supports both the underlay transmissions and the overlay transmissions and includes an interface to a mobile switching center, an underlay unit, an overlay unit and at least one radio frequency (RF) unit. The interface receives communications intended for a plurality of mobile stations serviced by the base station. These communications include underlay communications intended for mobile stations (MSs) supporting underlay transmissions and overlay communications intended for MSs supporting overlay transmissions. The underlay unit receives the underlay portion of the communications and produces underlay transmissions. The overlay unit receives the overlay portion of the communications and produces overlay transmissions. Then, the underlay transmissions and the overlay transmissions are received by the at least one RF unit and transmitted via at least one antenna to the plurality of MSs. Each of the MSs receives both the underlay transmissions and the overlay transmissions. However, those MSs supporting the underlay transmissions extract intended underlay communications while the MSs supporting overlay transmissions extract intended overlay communications. The underlay unit and the overlay unit produce the overlay transmissions such that they are at least partially orthogonal to the underlay transmissions. A synchronization unit coupled to the underlay unit and the overlay unit that causes the overlay transmissions to be substantially synchronized with the underlay transmissions. In another construction, differing base stations provide the underlay transmissions and the overlay transmissions.

대표청구항 ▼

[ What is claimed is:] [1.]1. A base station for use in a CDMA wireless communication system that supports underlay transmissions and direct spread overlay transmissions to a plurality of mobile stations, the base station comprising:an interface that receives communications intended for the pluralit

[ What is claimed is:] [1.]1. A base station for use in a CDMA wireless communication system that supports underlay transmissions and direct spread overlay transmissions to a plurality of mobile stations, the base station comprising:an interface that receives communications intended for the plurality of mobile stations;an underlay unit that receives an underlay portion of the communications and produces underlay transmissions, wherein the underlay unit couples the underlay transmissions on a plurality of underlay carriers, and wherein each of the plurality of underlay carriers occupies a respective underlay bandwidth;an overlay unit that receives an overlay portion of the communications and produces overlay transmissions, wherein the overlay unit couples the overlay transmissions on an overlay carrier having an overlay bandwidth that extends across a combined spectrum of the plurality of underlay bandwidths;at least one radio frequency unit that transmits the underlay transmissions and the overlay transmissions via at least one antenna to the plurality of mobile stations; andthe underlay unit and the overlay unit producing the overlay transmissions such that they are at least partially orthogonal to the underlay transmissions.