Multiplexed Communication Session for Satellite Terminal Overhead Reduction
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Solution Overview
Problem
In communication systems, establishing and tearing down links or channels for brief messages is inefficient, particularly in scenarios like the Iridium satellite system where terminals need to periodically transmit short data bursts, leading to significant overhead and inefficient use of link resources.
Innovation Solution
Multiple terminals share a single communication session, using multiplexing schemes like TDMA, FDMA, or CDMA to transmit data without individually establishing sessions, with maintenance messages handled by designated or distributed terminals to maintain the session and handle satellite beam handoffs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each terminal establishes a separate communication session to transmit brief messages, then message transmission reliability is ensured, but link resource efficiency deteriorates significantly
Solution Approach 1:
Multiple terminals merge their individual communication sessions into a single shared communication session. The first terminal establishes the session, and subsequent terminals transmit their messages within this existing session without creating separate sessions, thereby consolidating link resources while maintaining reliable message transmission for all terminals.
Solution Approach 2:
The single communication session serves multiple functions by accommodating messages from multiple terminals. The session is designed to be universal, allowing any terminal in the group to transmit messages during allocated time slots while using the same established session infrastructure, thus improving link resource efficiency without sacrificing individual terminal reliability.
2Ease of operation
If multiple terminals individually establish communication sessions, then each terminal has dedicated link access, but the overhead of session establishment and teardown increases significantly
Solution Approach 1:
The first terminal performs the preliminary action of establishing the communication session before other terminals need to transmit their messages. By pre-establishing the session infrastructure including authentication, parameter negotiation, and link configuration, subsequent terminals can immediately utilize the session during their allocated time slots without incurring session establishment overhead.
Solution Approach 2:
Multiple terminals combine their individual session establishment requirements into a single session setup process. Instead of each terminal independently going through authentication, parameter exchange, and link configuration, all terminals share the single session established by the first terminal, dramatically reducing the cumulative overhead of session establishment and teardown operations.
3Productivity
If a single communication session is shared by multiple terminals, then link resource efficiency improves significantly, but session maintenance complexity increases
Solution Approach 1:
The communication session is segmented into distinct time slots allocated to different terminals. This temporal segmentation allows multiple terminals to share the same physical link resources without interference, while the session maintenance mechanism only needs to manage these time slot assignments rather than coordinating multiple simultaneous sessions, thereby reducing overall complexity.
Solution Approach 2:
The session maintenance mechanism operates autonomously to manage the shared communication session. The system automatically handles time slot allocation, message routing, and session teardown without requiring manual intervention or complex coordination between terminals, thus maintaining link resource efficiency while keeping the maintenance complexity manageable through automated self-service operations.
Data Source
AI summary
A technique for enabling multiple terminals to simulate data traffic of a single virtual terminal includes transmitting from a first transmitting terminal a request to establish a communication session between the first transmitting terminal and a receiving terminal, where the first transmitting terminal is one a plurality of transmitting terminals. The first transmitting terminal receives at least one message from the receiving terminal to establish the communication session. Once the communication session is established between the first transmitting terminal and the receiving terminal, data traffic is transmitted from the plurality of transmitting terminals to the receiving terminal within the communication session such that the receiving terminal is unaware that more than one transmitting terminal is transmitting within the communication session. The communication session is maintained by transmitting maintenance messages from at least one of the plurality of transmitting terminals to the receiving terminal throughout the communication session.