Central Control Node for Shared Spectrum Channel Access
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Solution Overview
Problem
In spectrum sharing networks, contention-based protocols for accessing shared channels can lead to congestion and reduced spectral efficiency due to the lack of centralized control, causing GAA transmitters to wait excessively for channel access, especially in high-congestion scenarios.
Innovation Solution
Implementing a central control node that selectively transmits or triggers transmission request rejections to manage access to shared channels, allowing only certain transmitters to access the channel at specific times, thereby alleviating congestion and improving spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If contention-based channel access schemes are used in spectrum sharing networks, then decentralized operation and ease of deployment are achieved, but channel congestion and reduced spectral efficiency occur
Solution Approach 1:
The patent introduces a central control node as an intermediary entity that mediates between multiple distributed transmitters and the shared channel. This mediator receives transmission requests from transmitters, makes centralized access decisions, and sends rejection signals to control channel access, thereby resolving the contradiction between decentralized operation and spectral efficiency by adding a layer of intelligent coordination.
2Device complexity
If contention-based protocols are used without centralized control, then system complexity is reduced, but waiting times for channel access increase excessively
Solution Approach 1:
The central control node performs preliminary actions by proactively sending transmission request rejection signals to transmitters before they attempt channel access. This preliminary control mechanism prevents unnecessary waiting times by immediately informing transmitters whether their access requests are approved or rejected, eliminating the need for transmitters to repeatedly attempt access and wait for channel availability.
3Productivity
If selective transmission request rejection is implemented, then channel access control is improved, but additional control signaling overhead is introduced
Solution Approach 1:
The patent applies partial action by implementing selective rejection rather than complete centralized control. The central control node sends rejection signals only to specific transmitters that need to be denied channel access at particular times, rather than controlling all transmitters uniformly. This selective approach improves channel access control efficiency while minimizing the quantity of control signaling overhead compared to comprehensive centralized management.
Data Source
AI summary
A control node is disclosed for operating in a network with shared spectrum. The control node may include one or more processors configured to execute program code to identify a spectrum allocation policy; implement a rejection strategy for managing contention-based access to a shared channel by one or more transmitters based on the identified spectrum allocation policy; and transmit or trigger transmission of a transmission request rejection in response to a transmission request by a first transmitter of the one or more transmitters according to the rejection strategy.