Random Access Network Acknowledgement Management
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Solution Overview
Problem
Random access communication networks with long acknowledgement message transmission times prevent terminals from transmitting messages, as existing solutions either modify hardware and software configurations or abandon ALOHA slotted access, neither of which is fully satisfactory.
Innovation Solution
Periodically sending positive acknowledgement messages to terminals during authorized access slots, allowing terminals to transmit messages even if acknowledgement is received late, and adapting channel configurations based on signal quality to optimize communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the network uses long acknowledgement message transmission times (e.g., satellite repeater with 500ms delay), then the network can cover large geographical areas, but terminals cannot transmit messages because they exceed the predefined acknowledgement time threshold
Solution Approach 1:
The terminal transmits the message associated with the access request before receiving the acknowledgement message. The terminal determines that it can transmit the message based on having sent a valid preamble in an authorized access slot, even though the acknowledgement has not yet been received. This preliminary action allows the message transmission to proceed without waiting for the long acknowledgement delay.
Solution Approach 2:
The system dynamically adjusts the terminal's transmission behavior based on the relationship between the predefined acknowledgement time and the actual network acknowledgement time. When the predefined time is shorter than the actual network time, the terminal is authorized to transmit messages anyway, creating a flexible adaptation to long-delay networks while maintaining compatibility with standard terminal configurations.
2Productivity
If the network modifies hardware and software configurations to use acknowledgement times similar to network acknowledgement message transmission time, then terminals can transmit messages, but the hardware and software configurations of equipment and particularly terminals must be modified
Solution Approach 1:
The invention changes the logical parameter of when message transmission is authorized, rather than changing hardware or software configurations. The terminal uses the relationship between predefined acknowledgement time and actual network acknowledgement time as the basis for determining transmission authorization, allowing standard terminals to operate in long-delay networks without modification.
3Productivity
If the network eliminates acknowledgement messages and forces transmission of messages associated with access requests, then terminals can transmit messages, but the access is no longer of the ALOHA slotted type and standards for transmission interface must be modified
Solution Approach 1:
The terminal performs the message transmission as a preliminary action before receiving the acknowledgement message, while still maintaining the ALOHA slotted access structure. The terminal determines authorization to transmit based on having sent a valid preamble in an authorized access slot, preserving the random access nature of ALOHA slotted systems while enabling message transmission despite long acknowledgement delays.
Data Source
AI summary
A method is dedicated to communications management for a random access communications network, in which time intervals are broken down into access slots, and during each access slot, a network terminal can transmit an access request to the network associated with a message that it wants to transmit, and comprising at least one processing device that introduces a long time for transmission of an access request acknowledgement message. This method consists of periodically sending acknowledgement messages to terminals, each message comprising positive acknowledgement information associated with each authorized access slot. Thus, when a requesting terminal receives an acknowledgement message later than an access request transmitted during a given access slot, it can transmit the message associated with its access request.