초록 ▼

A local multipoint data distribution system (10) simultaneously accommodates many communication sessions occurring at a wide variety of data rates. space surrounding cell sites (12) is partitioned into sectors (16), and the spectrum is allocated to the cell sites (12) so that adjacent sectors (16) u

A local multipoint data distribution system (10) simultaneously accommodates many communication sessions occurring at a wide variety of data rates. space surrounding cell sites (12) is partitioned into sectors (16), and the spectrum is allocated to the cell sites (12) so that adjacent sectors (16) use different spectrum portions, but the entire spectrum is reused numerous times at each cell site (12). A time diversity scheme allocates different numbers of time slots (54) to different calls. Time slot identifiers are assigned in contiguous blocks in an assigned numbering system (56). The time slot identifier assignments are translated into a counted numbering system (58) which causes the time slots (54) for any call to be distributed throughout a frame (48) and interleaved with time slots (54) assigned to other calls. Data communications use a common modulation format and a modulation order that is specifically adapted to a particular call, thus maintaining system capacity for any spatial distribution, quality requirement, and data requirement for subscriber units (14).

대표청구항 ▼

[ What is claimed is:] [1.] A multirate, local multipoint data distribution method comprising the steps of:a) broadcasting outgoing signals from a cell site over a forward RF channel;b) receiving said outgoing signals at first and second subscriber units;c) from said first and second subscriber unit

[ What is claimed is:] [1.] A multirate, local multipoint data distribution method comprising the steps of:a) broadcasting outgoing signals from a cell site over a forward RF channel;b) receiving said outgoing signals at first and second subscriber units;c) from said first and second subscriber units, transmitting first and second messages, respectively, to said cell site over a reverse RF channel, said messages being configured in response to said outgoing signals received in said receiving step;d) at said cell site, selecting a first data rate in response to said first message and a second data rate in response to said second message;e) simultaneously engaging in a first communication session through said cell site and said first subscriber unit at said first selected data rate and in a second communication session through said cell site and said second subscriber unit at said second selected data rate;f) configuring time into frames that are divided into time slots and which are common to said first and second communication sessions;g) assigning a first contiguous block of said time slots to said first communication session and a second contiguous block of said time slots to said second communication session, said first and second contiguous blocks having sizes determined in response to said first and second selected data rates, respectively, and said first and second contiguous blocks being identified in accordance with a first numbering system;h) identifying time slots within said frames, said time slots being identified in accordance with a second numbering system;i) translating identities of said time slots from said second numbering system into said first numbering system; andj) comparing said translated time slot identities to said assigned first and second contiguous blocks of time slots.