Airborne Relay Terminal Access Control and Path Diversity
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Solution Overview
Problem
Existing satellite relay systems face limitations in reliability due to blockage of propagation paths, lack of interference rejection, and inadequate control of access and resource allocation, leading to suboptimal communication performance and capacity.
Innovation Solution
A relay terminal that stores authorization and priority data for user terminals, detects identification codes in incoming signals, and processes them to authorize immediate relaying to authorized destinations, while applying different frequency hopping patterns to enhance throughput and minimize delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If bent pipe relays are used to simultaneously receive and relay multiple communication signals, then the device complexity is reduced, but the reliability deteriorates due to lack of interference rejection and path blockage
Solution Approach 1:
The patent introduces an airborne relay terminal as an intermediary component between ground terminals and satellite relay. This intermediary provides alternative propagation paths around blockages and enables interference rejection through spatial diversity, resolving the reliability issue while maintaining relative simplicity of the overall system architecture.
Solution Approach 2:
The patent transitions from ground-based relay to airborne relay, adding the vertical dimension to the communication architecture. This dimensional change allows the relay terminal to position itself above ground blockages, creating three-dimensional path diversity and improving reliability without significantly increasing device complexity.
2Reliability
If processing relays with fixed channel assignments are used, then the reliability improves through onboard processing and interference rejection, but the adaptability deteriorates due to static channel assignments
Solution Approach 1:
The patent implements dynamic channel assignment where the airborne relay terminal can flexibly allocate communication channels based on real-time propagation conditions, terminal positions, and traffic demands. This dynamic approach maintains reliability through onboard processing while achieving adaptability through runtime channel reconfiguration, resolving the contradiction between fixed and flexible assignments.
Solution Approach 2:
The system performs preliminary channel assignment planning based on predicted terminal movements and propagation conditions, then dynamically adjusts assignments in real-time. This combination of preliminary planning and dynamic adjustment maintains both reliability and adaptability in the channel assignment process.
3Ease of operation
If ground-based control stations are used to manage channel assignments, then the access control is simplified through centralized management, but the loss of time increases due to request-service-assignment delays
Solution Approach 1:
The airborne relay terminal acts as an intermediary that performs local channel assignment and access control decisions, reducing the need for continuous ground station intervention. This distributed control approach maintains access control simplicity through standardized protocols while significantly reducing assignment delays by making decisions at the edge of the network.
Solution Approach 2:
The system performs preliminary channel assignment and access control configuration in advance based on predicted communication patterns, then executes these pre-planned assignments locally at the airborne relay terminal. This preliminary action reduces real-time ground station communication overhead and minimizes channel assignment delays while maintaining centralized oversight.
4Reliability
If multiple independent receivers with non-coherent combining are used for path diversity, then the reliability improves through blockage mitigation, but the device complexity increases
Solution Approach 1:
The patent combines multiple received signals from different propagation paths using coherent combining techniques at the airborne relay terminal. By merging signals with phase and amplitude coordination, the system achieves reliability improvement through diversity while reducing complexity compared to multiple independent receiver chains, as signals are processed and combined in a unified architecture.
Data Source
AI summary
A relay terminal for relaying communication signals from originator user terminals to destination user terminals stores relay-authorization-and-priority data for a plurality of user terminals having respective identification codes; detects the identification codes in communication signals sent from a plurality of originator terminals; processes the detected identification codes in combination with the stored data to determine if immediate relaying of the received communication signals to respective identified destination terminals is authorized; and relays the received communication signals immediately to only those of the identified destination terminals to which immediate relaying is so authorized. Directional-position data associated with a given originator terminal derived by processing portions of a signal received from such originator terminal is processed to form a beam path for communications with the given originator terminal.