MIXED TRAFFIC MOBILE RADIO SYSTEM

• US 3,786,199 A
• Filed: 10/22/1971
• Issued: 01/15/1974
• Est. Priority Date: 10/22/1971
• Status: Expired due to Term

• Current Assignee: Andrew Rimbach Jr
• Original Assignee: Andrew Rimbach Jr
• Inventors: Rimbach, Andrew Jr.
• Primary Examiner(s): Cooper, William C.
• Assistant Examiner(s): Kundert, Thomas L.
• Application Number:
  US05/191,931
• Time in Patent Office: 816 Days
• Field of Search: 179/41A,18BG,15AS,27D,27FH
• US Class Current: 455/450
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 84/08 Trunked mobile radio systems

Abstract

In order to merge telephone traffic and dispatch traffic into a common network without degrading either type of service over that enjoyed in separate systems, dispatch type traffic is somewhat degraded during particular high traffic situations. The telephone traffic is served upon demand except when no communication channels are available for assignment. The identity of each requesting dispatcher is read into a queuing buffer to await service. So long as more than a predetermined number of channels are available, the dispatch calls are read out of the buffer virtually upon their receipt. Whenever fewer than the predetermined number of channels are available, pulses which energize the service of dispatch calls are subjected to a time delay. After that delay, so long as any channel is still available, the next dispatcher in queue is served.

Claims

1. A mobile communication system for assigning communication channels to telephone type traffic and dispatch type traffic comprising:

first logic circuit means responsive to the use status of said communication channels for developing a predetermined logical state if any one of said communication channels is free for use;

means for servicing telephone type traffic upon demand if the predetermined logical state is developed by said first logic circuit means;

means for generating an energizing pulse in response to a condition of dispatch service demand including a buffer means for storing information corresponding to dispatch type calls in the order of their receipt, said information being sequentially read out for service upon receipt of an energizing pulse at an input terminal of said buffer means;

second logic circuit means responsive to the use status of said communication channels for developing a predetermined logical state if at least a predetermined number of channels are free, where the predetermined number is greater than one;

first gating means for coupling said energizing pulse from said means for generating to the input terminal of said buffer means if the predetermined logical state iS developed by said second logic circuit means; and

second gating means for delaying application of said generated energizing pulse to the input terminal of said buffer means by a fixed time delay if the predetermined logical state is developed by said first logic circuit means and the predetermined logical state is not developed by said second logic circuit means.

2. A mobile communication system for assigning communication channels to telephone type traffic and dispatch type traffic while maintaining both classes of traffic at an acceptably high level comprising:

first logic circuit means responsive to the use status of said communication channels for developing a predetermined logical state if any one of said communication channels is free for use;

means for serving telephone traffic on demand if the predetermined logical state is developed by said first logic circuit means;

means for generating an energizing signal in response to a condition of dispatch service demand including a buffer means for storing information corresponding to dispatch type calls in the order of their receipt, said information being sequentially read out for service upon receipt of an energizing signal at an input terminal of said buffer means;

second logic circuit means responsive to the use status of said communication channels for developing a predetermined logical state if at least a predetermined number of channels are free, where said predetermined number is greater than one;

first logic gating means for coupling said energizing signal from said means for generating to the input terminal of said buffer means if the predetermined logical state is developed by said second logic circuit means;

time delay means;

second logic gating means energized by concurrence of the predetermined logical state from said first logic circuit means and the absence of the predetermined logical state from said second logic circuit means for coupling said energizing signal from said means for generating to said time delay means; and

third logic gating means for coupling to said input terminal of said buffer means a delayed energizing signal from said time delay means if the predetermined logical state is developed by said first logic circuit means.