Backup Radio Parameter List for Secondary Spectrum Access
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Solution Overview
Problem
Secondary-use radio systems face disruptions due to network faults that prevent access to geo-location databases, leading to outdated channel information and potential shutdowns, as they rely on central databases for channel allocation and updates.
Innovation Solution
A backup radio operating parameter list is maintained by creating a common set of channel information across multiple slave nodes, which can access databases independently and share information to ensure continuous operation even when the primary master node loses connection, using alternative communication networks to refresh and distribute channel data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If secondary-use operators rely on central databases for channel information updates, then channel allocation accuracy is improved, but system reliability deteriorates when network faults occur
Solution Approach 1:
The patent divides the centralized database system into multiple distributed slave nodes, each maintaining local copies of channel information. This segmentation allows the system to continue operating with partial data if the master node or database connection fails, resolving the contradiction between centralized accuracy and distributed reliability.
Solution Approach 2:
Slave nodes proactively obtain and store channel information from the database in advance, maintaining local backups before faults occur. This preliminary action ensures that even when network faults prevent access to the central database, nodes already have cached channel data to continue operations.
2Reliability
If slave nodes access databases independently using alternative networks, then reliability is improved, but device complexity increases
Solution Approach 1:
Slave nodes are designed with multi-functionality, capable of both accessing the central database through primary networks and independently querying alternative networks for channel information. This universal capability allows nodes to adapt to different network conditions without requiring separate specialized systems, managing complexity while improving reliability.
3Reliability
If channel information is distributed among multiple nodes, then system availability is improved, but information consistency becomes harder to maintain
Solution Approach 1:
The patent implements feedback mechanisms where slave nodes periodically report their local channel information status to the master node, and the master node coordinates updates across the network. This feedback loop helps maintain information consistency by detecting and correcting divergences between distributed node data and the central database.
Solution Approach 2:
When channel information changes in the central database, the system uses parameter change notifications to update slave nodes. The master node detects changes in channel parameters (such as frequency allocations or power limits) and propagates these updates to relevant slave nodes, ensuring all nodes operate with current information.
Data Source
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AI summary
A radio communication system (100) provides a radio air interface at a master node (102) for subscriber units associated with the master node. Among the subscriber units are several slave nodes (104, 106). The communication system has the ability to operate as a secondary user in unused spectrum portions of a frequency band otherwise reserved for primary operators, such as licensed broadcasters. The master node accesses an authorization server (108) to obtain a list of unused channels in the region of the master node. Each slave node also contacts the authorization server to obtain a list of unused channels in the region where each respective slave node is located, via another network (118, 121). The unused channels common to the slave nodes and the master node are used to create a backup radio operating parameter list which is used by the master node if a fault occurs between the master node the authorization server.