Two-way communications system having remote channel selection

• US 4,144,497 A
• Filed: 08/15/1977
• Issued: 03/13/1979
• Est. Priority Date: 08/15/1977
• Status: Expired due to Term

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Andrea, Ralph W. III
• Primary Examiner(s): Griffin, Robert L.
• Assistant Examiner(s): Ng, Jin F.
• Application Number:
  US05/824,994
• Time in Patent Office: 575 Days
• Field of Search: 325/2-5, 325/7, 325/8, 325/21, 325/22, 325/51-57, 325/64, 325/301, 325/302, 325/304, 325/306, 325/368, 343/175, 343/176, 343/200, 343/177, 179/2 EB
• US Class Current: 455/527
• CPC Class Codes: H04B 7/15542 Selecting at relay station its transmit and receive resources selection of wireless resources by user or terminal H04W72/02; arrangements affording multiple use of the transmission path by two-dimensional division of the resources H04L5/0003, or by allocating sub-channels H04L5/003
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A channel priority encoder in a mobile/repeater unit of a two-way communications system allows a low power, detached unit to remotely select a desired channel for high power repeater transmission to and reception from a base station. The selection can be latched-in permanently or can be made to revert to a home channel after a delay. The mobile unit can override a channel selection made by the detached unit, but another mobile unit would provide the repeater function.

Claims

1. A channel selection circuit for remote selection of ones of a plurality of prioritized channels of a multi-channel communications system including in combination:

means for receiving a plurality of transmitted channel selection signals each of said signals corresponding to a predetermined priority of one channel of the system;

a plurality of first detector means coupled to the receiving means and each separately providing an output signal only in response to a different channel selection signal within the received signals;

channel prioritizing means coupled to the detector means for providing an output signal in response to the one received predetermined signal having the highest channel priority and including frist input means for receiving a first predetermined signal from said first detector means, first logic means coupled to the first input means for providing an output signal in response to the reception of the first predetermined signal, said first logic means output signal being the signal for the highest priority channel, second input means for receiving a second predetermined signal from said first detector means, second logic means coupled to provide an output signal in response to the reception of the second predetemined signal in the absence of the first predetermined signal, said second logic means output signal being the signal for the second highest priority channel; and

a plurality of channel driver means coupled to receive the output signal of the channel prioritizing means for enabling the circuitry of the appropriate channel.

2. The channel selection circuit according to claim 1 wherein the channel prioritizing means includes additional input means for receiving additional predetermined signals from said first detector means, and additional logic means coupled to provide outputs in response to the reception of the additional predetermined signals in the absence of signals having higher priority.

3. The channel selection circuit according to claim 1 and further including second detector means coupled to the first detector means for providing a first output signal in response to any of the output signal from the first detector means and a different output signal in the absence of all of the output signals from the first dectector means;

a first plurality of switching means coupled between the prioritizing means and the channel driver means and enabled by the first output signal of the second detector means;

manual channel select means for providing local channel selection;

a second plurality of switching means coupled between the manual channel select means and the channel driver means and enabled by the second output signal of the second detector means.

4. The channel selection circuit according to claim 1 and further including input means for receiving a predetermined signal from other portions of the communications system, for decoupling the channel driver means from control by the channel prioritizing means in the presence of said predetermined signal from said other system portions or in the absence of the reception of any of the plurality of channel selection signals and for coupling the channel driver means to be controlled by said other portions of the communications system.

5. The channel selection circuit according to claim 1 and further including second detector means coupled to the first dector means for providing a first output signal in response to the detection of any of the output signals from the first detector means;

a plurality of latching means coupled to the output of the prioritizing means and to the output of the second detector means for enabling a selected one of the channel driver means until a different one of the predetermined signals is detected.