Fast terminal entry in link 16 tactical networks

Patent metadata

Field	Value
Publication number	US-9936499-B2
Application number	US-201515032163-A
Country	US
Kind code	B2
Filing date	Aug 10, 2015
Priority date	Aug 22, 2014
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

A process for allowing a Concurrent Multi-Netting (CMN-4) equipped Link 16 terminal to enter an active network. After an initial entry command is entered at the terminal at a given current time at the terminal, a number of time slots are identified in which multiple receivers at the terminal have an opportunity to detect an initial entry message (IEM) after the given current time. Each of the receivers is set to detect an IEM during a different one of the identified time slots. When an IEM is first detected by one of the receivers, the current time at the terminal is reset based on the time slot in which the IEM was detected.

First claim

The invention claimed is:

1. A process for allowing a terminal equipped for operation in a time division multiple access (TDMA) network to enter the network, wherein an initial entry message (IEM) is transmitted periodically in certain identified time slots by one or more members of the network for reception by the terminal, comprising:
providing a time base at the terminal for indicating a terminal current time:
providing a receiver system at the terminal including multiple receivers;
entering an initial entry command at the terminal at the terminal current time;
identifying a number of time slots in which the receivers at the terminal have an opportunity to detect an IEM after the terminal current time;
adding a determined time error window to the terminal current time, a first one of the identified time slots is the first slot in which one of the receivers has the opportunity to detect the IEM after the initial entry command is entered, a second one, of the identified time slots is the second slot in which one of the receivers has the opportunity to detect the IEM after the time error window is added to the terminal current time, and identifying one or more additional time slots in which one of the receivers has the opportunity to detect the IEM after the time error window is added to the terminal current time, identifying at least a third time slot in which one of the receivers has the opportunity to detect the IEM between the first and the second time slots;
setting each of the receivers to detect the IEM during a different one of the identified time slots;
detecting the IEM in each of the identified time slots; and
resetting the terminal current time at the terminal based on the time slot in which the IEM is first detected.

2. A process according to claim 1 , wherein the setting step includes setting each receiver according to an assigned frequency and code for the time slot during which the receiver is set to detect the IEM.

3. A process according to claim 1 , including identifying a fourth time slot in which one of the receivers has an opportunity to detect the IEM between the first and the second time slots, and the third and the fourth time slots occur approximately at one-third and two-thirds the time error window, respectively.

4. A process according to claim 1 , including providing the terminal in the form of a Concurrent Multi-Netting (CMN-4) enhanced Link 16 tactical network terminal.

5. A process according to claim 4 , including performing at least some of the steps by configuring and programming an application processor provided in the terminal.

Assignees

• Bae Systems Information And Electronics Systems Integration Inc
• Bae Sys Inf & Elect Sys Integ

Inventors

• Chongoushian John H
• Altrichter Wayne W

Classifications

• H04W56/0015

  one node acting as a reference for the others · CPC title

• H04L2012/6459

  Multiplexing, e.g. TDMA, CDMA · CPC title

• H04W72/0446 Primary

  Resources in time domain, e.g. slots or frames · CPC title

• H04H20/16

  Arrangements for broadcast or for distribution of identical information repeatedly · CPC title

• H04L27/10

  Frequency-modulated carrier systems, i.e. using frequency-shift keying (H04L27/32 takes precedence) · CPC title