Method for reducing synchronizing overhead of frequency hopping communications systems

• US 5,428,637 A
• Filed: 08/24/1994
• Issued: 06/27/1995
• Est. Priority Date: 08/24/1994
• Status: Expired due to Fees

• Current Assignee: The United States of America As Represented By The Secretary of Agriculture
• Original Assignee: The United States Of America As Represented By The Secretary Of The Army
• Inventors: Oliva, George R. Jr., Lorenzo, Gregory, Loffer, Kenneth J.
• Primary Examiner(s): Gregory, Bernarr E.
• Application Number:
  US08/295,343
• Time in Patent Office: 307 Days
• Field of Search: 375/1, 380/34, 455/49.1
• US Class Current: 375/134
• CPC Class Codes: H04B 1/7156 Arrangements for sequence synchronisation

Abstract

A method for reducing the synchronization overhead in Frequency Hopping communication systems. Generally, the method establishes a synchronization state during which a plurality of communications can take place without re-synchronization before each separate transmission. More particularly, the method establishes a synchronization period during which all the radios are initially synchronized, followed by a series of acknowledgment period and transmission periods during which any unit intending to transmit is assigned a specific time slot for such transmission.

Claims

1. An efficient method for establishing communications between member units on a frequency hopping communications system having a predetermined communications channel, comprising the steps of:

a. transmitting synchronization information from an initiating member unit to the remaining remote member units, said synchronization information synchronizing the remote member units with said initiating member unit.;

b. transmitting a transmission request from the remote member units to said initiating member unit to indicate which Of the remote member units have successfully synchronized with said initiating member unit and which member units intend to transmit on the frequency hopping communications channel, each said transmission request transmitted during an acknowledgement time period having a sequence of time slots, each member unit having a predetermined time slot within said acknowledgement time period during which said transmission request is transmitted;

c, assigning a transmission time slot within a transmission time period to each of the member units that transmitted said transmission request during said acknowledgement period, said transmission time period immediately following said acknowledgement time period;

d. transmitting information from the member units assigned said transmission time slots on the communications channel during said transmission time period;

e. repeating steps b-d until no member units transmit said transmission request during said acknowledgement period.

2. The method of claim 1 wherein the frequency hopping communications system is the United States Single Channel Ground and Airborne Radio System.