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1. (WO1992010889) TDM COMMUNICATION SYSTEM FOR A WIDE AREA SITE AND A PLURALITY OF LOCAL SITES
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- Claims 21

1. A communication system capable of communicating communication messages within a wide area site and a plurality of local sites on at least one radio frequency channel divided into at least one time slot and a plurality of sub slots, wherein each sub slots have substantially shorter duration than said time slot, and wherein each of said sub slots is assigned to a local site, comprising:
a plurality of local site communication units operating within said local sites;
a plurality of local site communication means for communicating communication messages with at least one local site communication unit during said sub slots;
a main site communication means for
communicating communication messages with said local site communication means during at least one of said time slots.

2. The communication system of claim 1 , further including:
a plurality of wide area site communication units which communicate with said main site communication means during at least one of said time slots.

3. The communication system of claim 1 , wherein said local site communication units include means for selecting a local site which provides a communication quality characteristic above a threshold level during its assigned sub slot.

4. The communication system of claim 1 , further including means for communicating a voice message between the local site communication units and the wide area site communication units.

5. The communication system of claim 4, wherein, said local site communication units include means for selecting another local site when said local site communication unit does not participate in a voice call in progress.

6. A method for communicating communication messages between local site communication units operating in a plurality of local sites and a main site communication means within a wide area site via at least one radio frequency channel divided into at least one time slot and a plurality of sub slots, wherein said sub slots have a substantially shorter duration than said time slot, comprising the steps of:
(a) assigning at least one of said sub slots to each local site;
(b) communicating communication messages between said main site communication means and a plurality of local site communication means during said time slots;
(c) communicating communication messages between said local site communication means and at least one
communication unit during said sub slot assigned to that local site.

7. A communication system capable of communicating communication messages on at least one radio frequency channel divided into at least one time slot and a plurality of sub slots wherein each of said sub slots is assigned to one of a plurality of local sites, comprising:
a plurality of local site communication units operating in said local sites;
a plurality of local site communication means for communicating communication messages with said local site communication units.

8. In a communication system capable of communicating communication messages within a wide area site and a plurality of local sites on at least one radio frequency channel divided into at least one time slots and a plurality of sub slots, wherein each sub slots have substantially shorter duration than said time slot, and wherein each of said sub slots are assigned to a local site, a communication unit operating in said local site comprising:
means for communicating with a local site communication means during its assigned sub slot;
means for measuring a communication quality characteristic during sub slots assigned to each local site;
means for selecting a local site which during its assigned sub slot provides a communication quality characteristic above a threshold level.

9. A method for providing communication capability between a wide area site and a plurality of local sites, comprising the steps of:
(a) dividing at least one radio frequency channel into at least one time slot and a plurality of sub slots, wherein each of said sub slots have substantially shorter duration than said time slots;
(d) assigning said time slot for communicating communication messages within said wide area site;
(c) assigning at least one of said sub slots to each of said local sites for communicating communication messages within that local site.

10. A method for providing communication capability to a plurality of local sites, comprising the steps of:
(a) dividing at least one radio frequency channel into a plurality of time slots;
(b) dividing said plurality of local sites into a plurality of local site groups, each comprising a plurality of local sites;
(c) assigning at least one of said time slots to each of said local sites in each of said local site groups for
communicating communication messages within that site such that the time slots assigned to each local site group are
substantially the same.