Communication system with controlled talk around mode
First Claim
1. A method for providing talk around in an OFDMA communication system comprised of OFDMA time slots, wherein each OFDMA time slot is subdivided into a plurality of sub-channels, comprising the steps of:
- sending a talk around request from a subscriber unit to a base unit;
acknowledging the request at the base unit and sending a signal from the base unit to the subscriber unit;
determining at the subscriber unit a RSSI (received signal strength indication) of the signal received from the base unit;
sending the RSSI from the subscriber unit to the base unit;
comparing in the base unit the RSSI to a predetermined window;
(a) denying, if the RSSI is above the window, the request from the subscriber unit, the subscriber unit thereby not going into a talk around mode;
(b) assigning, if the RSSI is within the window, (i) a sub-channel of the OFDMA communication system and (ii) a power level to the subscriber unit, the subscriber unit thereby going into talk around mode; and
(c) not responding, if the RSSI is below the window, to the subscriber unit, the subscriber unit thereby going into a direct communication mode.
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Accused Products
Abstract
The method provides talk around in an OFDMA communication system by sending a talk around request from a subscriber unit to a base unit. At the subscriber unit a RSSI (received signal strength indication) of a signal received from the base unit is determined and sent back to the base unit. In the base unit the RSSI is compared to a predetermined window. If the RSSI is above the window, the request from the subscriber unit is denied. If the RSSI is within the window, a sub-channel of the OFDMA communication system and a power level are assigned to the subscriber unit, the subscriber unit thereby going into talk around mode. If the RSSI is below the window, the subscriber unit does not respond and the subscriber unit goes into a direct communication mode independent of the OFDMA communication system.
23 Citations
10 Claims
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1. A method for providing talk around in an OFDMA communication system comprised of OFDMA time slots, wherein each OFDMA time slot is subdivided into a plurality of sub-channels, comprising the steps of:
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sending a talk around request from a subscriber unit to a base unit;
acknowledging the request at the base unit and sending a signal from the base unit to the subscriber unit;
determining at the subscriber unit a RSSI (received signal strength indication) of the signal received from the base unit;
sending the RSSI from the subscriber unit to the base unit;
comparing in the base unit the RSSI to a predetermined window;
(a) denying, if the RSSI is above the window, the request from the subscriber unit, the subscriber unit thereby not going into a talk around mode;
(b) assigning, if the RSSI is within the window, (i) a sub-channel of the OFDMA communication system and (ii) a power level to the subscriber unit, the subscriber unit thereby going into talk around mode; and
(c) not responding, if the RSSI is below the window, to the subscriber unit, the subscriber unit thereby going into a direct communication mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for preserving system integrity in an OFDMA communication network having a trunk composed of a plurality of OFDMA time slots, wherein each OFDMA time slot is subdivided into a plurality of sub-channels and the OFDMA communication network including a base unit and a plurality of subscriber units, comprising the steps of:
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sending a talk around request from a first subscriber unit of the plurality of subscriber units to the base unit;
acknowledging the request at the base unit and sending a signal from the base unit to the first subscriber unit;
determining at the first subscriber unit a RSSI (received signal strength indication) of the signal received from the base unit;
sending the RSSI from the first subscriber unit to the base unit;
comparing in the base unit the RSSI to a predetermined window;
(a) denying, if the RSSI is above the window, the request from the first subscriber unit, the first subscriber unit thereby not going into a talk around mode;
(b) assigning, if the RSSI is within the window, the first subscriber unit to a sub-channel for talk around which is spaced apart from other sub-channels for talk, and controlling a power level to the first subscriber unit to minimize interference to the network by the first subscriber unit being in talk around mode, the first subscriber unit thereby going into a talk around mode; and
(c) not responding, if the RSSI is below the window, to the first subscriber unit, the first subscriber unit thereby going into a direct communication mode independent of the communication network. - View Dependent Claims (10)
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Specification