Common Channel Processing in Dynamic Spectrum Access
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Solution Overview
Problem
The existing fixed spectrum assignment mode in cellular wireless communication systems is inefficient and wastes spectrum resources, making it difficult to implement a common channel mechanism in dynamic spectrum environments, such as those used in Dynamic Spectrum Access (DSA) systems where available spectrum is uncertain.
Innovation Solution
A method and device for common channel processing that involves generating and negotiating sets of common channel spectrum candidates between base stations and terminals based on location and attribute information of available sub-carriers, enabling the selection of candidate sub-channels and determining common channel spectrums, allowing for spectrum negotiation and synchronization in dynamic environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed spectrum assignment mode is used, then common channel search and synchronization can be quickly and reliably performed, but spectrum utilization efficiency is low and spectrum resources are wasted
Solution Approach 1:
The patent applies dynamics by transitioning from fixed spectrum assignment to dynamic spectrum assignment, where the common channel spectrum is selected based on real-time spectrum environment detection. The base station and terminal negotiate to find available spectrums dynamically, allowing the system to adapt to changing spectrum conditions while maintaining common channel functionality.
Solution Approach 2:
The patent changes the parameter of spectrum assignment from fixed to dynamic by introducing spectrum environment detection and negotiation mechanisms. The system monitors spectrum usage and selects common channel spectrums based on current availability, changing the operational parameters adaptively rather than using predetermined fixed assignments.
2Productivity
If dynamic spectrum assignment mode is used, then spectrum utilization efficiency is improved, but it becomes impossible to predetermine a fixed available spectrum for common channel
Solution Approach 1:
The patent applies preliminary action by performing spectrum environment detection and common channel spectrum negotiation during the initial access phase, before actual data transmission begins. This preliminary negotiation establishes the common channel spectrum in advance, avoiding the need for complex real-time negotiations during active communication.
Solution Approach 2:
The patent uses an intermediary approach where the base station acts as a mediator in the spectrum negotiation process. The base station receives spectrum capability information from terminals, determines appropriate common channel spectrums, and provides this information back to terminals, simplifying the overall negotiation complexity through centralized coordination.
3Productivity
If dynamic spectrum assignment is used, then spectrum resources are better utilized, but common channel mechanism cannot be implemented in uncertain spectrum environment
Solution Approach 1:
The patent implements feedback mechanisms where terminals report their spectrum detection results and capabilities to the base station. The base station uses this feedback information to determine appropriate common channel spectrums and provides this determination back to terminals, ensuring reliable common channel establishment through iterative information exchange and confirmation.
Solution Approach 2:
The patent achieves universality by designing a common channel mechanism that can operate in both fixed and dynamic spectrum assignment modes. The system maintains the essential common channel functions (synchronization, system information transmission) while adapting to different spectrum assignment scenarios, making the mechanism universally applicable across various deployment conditions.
Data Source
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AI summary
The embodiments of the present invention provide a method, a device and a system for common channel processing, and the method includes: generating a first set of common channel spectrum candidates according to location information of available sub-carriers and attribute information of the available sub-carriers retrieved from a first database of spectrum statuses; transmitting the first set of the common channel spectrum candidates to a terminal; and determining candidate sub-channels for common channels from a third set of common channel spectrum candidates returned by the terminal, so as to generate and transmit a set of common channel spectrums to the terminal. With the embodiments of the present invention, the base station and the terminal acquire respectively local sub-carriers which are available currently, and perform spectrum negotiation. Finally, a set of common channel spectrums is determined by the base station, and a common channel mechanism is enabled in a dynamic spectrum environment.