Communication Control Device Subframe Selection for Secondary System Resource Allocation
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Solution Overview
Problem
In communication systems, especially in LTE, it is challenging for secondary systems to efficiently identify and utilize communication resources that are idle in primary systems without increasing the load on the primary system, as existing methods are inefficient and may lead to interference with neighboring cells.
Innovation Solution
The primary system efficiently notifies secondary systems of available communication resources by transmitting identification information through system information, allowing the secondary system to easily check and utilize these resources, while minimizing interference by setting specific subframes as MBSFN or uplink subframes, and restricting usage at cell edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the primary system notifies the secondary system of communication resources in the idle state, then the secondary system can check and utilize idle resources, but the load of the primary system increases
Solution Approach 1:
The patent extracts only the essential identification information of idle communication resources (such as resource block indices, time slot information) and transmits it to the secondary system, rather than notifying all detailed resource status information. This selective extraction reduces the notification overhead on the primary system while providing sufficient information for the secondary system to identify and utilize idle resources.
Solution Approach 2:
The primary system creates a simplified copy or representation of the idle resource information (e.g., using resource indication values or abbreviated resource maps) and transmits this copy to the secondary system. This copying approach allows the secondary system to obtain necessary information without requiring the primary system to maintain and transmit complete real-time resource status, thereby reducing the primary system's load.
2Productivity
If the secondary system checks communication resources in the idle state, then it can utilize available resources, but it may cause interference with neighboring cells
Solution Approach 1:
The patent applies local quality by allowing secondary systems at different locations to access different idle resources based on their specific conditions. The system identifies geographical or cellular-specific idle resources and assigns them to secondary systems in those areas, ensuring that resource usage is localized and does not cause interference in other cells. This spatial differentiation enables productive resource utilization while preventing harmful cross-cell interference.
Solution Approach 2:
The primary system acts as an intermediary that coordinates resource access between secondary systems and neighboring cells. It monitors which resources are truly idle across cell boundaries and mediates the allocation to secondary systems, preventing them from selecting resources that would cause interference. This intermediary control enables the secondary system to utilize idle resources productively while the primary system prevents harmful interference through coordinated management.
Data Source
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AI summary
Provided is a communication control device including a radio communication unit configured to perform radio communication with a terminal apparatus of a primary system using a frequency band of the primary system, and a selecting unit configured to select a subframe in which the frequency band is usable by a secondary system secondarily using the frequency band, the subframe being a unit of time in radio communication. The radio communication unit transmits system information of the frequency band including identification information of the selected subframe.