Motorola Corporation

Motorola Solutions, Inc.

Roger M Vilmur

James K Gehrke

Salomon Serfaty

Leslie G Gustafson

George R Economy

Terrance J Goedken

Eilon Eyal

Richard A Rose

Doron Nadjar

A first Mobile Repeater System (MRS), configured to serve as an access point associated with a Basic Service Set (BSS), broadcasts a Basic Service Set Identifier (BSSID). Other Mobile Repeater Systems (MRSs) join the BSS to create a local ad hoc trunked site in which each of the MRSs are communicatively coupled via at least one WLAN communication link. These MRSs include the first MRS and a second MRS. The first MRS can be configured to provide a control channel for communication with a first subscriber unit, and the second MRSs can be configured to provide a first trunked traffic channel for communication with the first subscriber unit.

Mobile repeater system based ad hoc trunked sites

A trunked base station (BS) in a trunked radio system tunes its receiver to the hailing channel and monitors for a hailing signal. A subscriber unit (SU) scans a first set of control channels for a control signal transmitted by the trunked BS. In response to failing to locate a control signal on any one of the first set of control channels, the SU tunes its transmitter to a hailing channel and transmits a hailing signal. In response to receiving a hailing signal from a SU, the BS tunes to a transmit portion of a trunked control channel and transmits a control signal. And the BS subsequently tunes to a receive portion of the trunked control channel and monitors for a registration response. Subsequently, the SU scans a second set of control channels for a control signal transmitted by a BS in the system.

Method and device to support site activation using a hailing channel

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.

Communication system with controlled talk around mode

The method provides talk around in the communication system by sending a talk around request from one of the subscriber unitsto the 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 unitthe 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 frequency channel and 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 communication system.

An exceptionally wideband, synthesizer controlled voltage controlled oscillator is disclosed which is characterized by a plurality of pin diode frequency shift networks which, when actuated shifts the frequency of the oscillator in selectable binary steps within a wide frequency range in the order of 48 MHz. Special means are included to prevent undesireable parasitic oscillation modes when such frequency shift networks are in an inactuated, switched off mode. A multiple varactor tuning circuit is provided for selecting a precise frequency within a relatively narrow frequency band on the order of 6 MHz.

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Palatine, IL, United States of America

Roger M Vilmur