Tailored Channel Quality Indicator Tables for Wireless Cells
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Solution Overview
Problem
Conventional wireless communication systems use fixed Channel Quality Indicator (CQI) tables that do not account for individual cell characteristics, leading to inaccurate radio resource allocation due to varying channel conditions across cells.
Innovation Solution
Tailoring CQI tables to specific cells based on analyzed channel quality information, such as CQI values, cell size, terrain features, and antenna configurations, to ensure more accurate and reliable radio resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fixed standardized CQI tables are used for all cells, then system compatibility and ease of deployment are improved, but channel quality measurement precision deteriorates due to varying cell characteristics
Solution Approach 1:
The patent applies local quality by creating cell-specific CQI tables tailored to individual cell characteristics such as path loss, shadowing, and interference patterns. Each cell generates its own customized CQI table based on measured channel conditions, allowing the system to maintain both deployment simplicity (through automated generation) and measurement precision (through cell-specific optimization).
Solution Approach 2:
The patent changes the parameters of CQI tables dynamically by adjusting the mapping between CQI indices and channel quality thresholds based on measured cell conditions. The base station measures channel quality over time and recalibrates the CQI table parameters to match actual cell characteristics, thereby improving measurement precision without requiring manual intervention.
2Measurement precision
If cell-specific tailored CQI tables are generated and deployed, then channel quality measurement precision is improved, but device complexity and information loss increase due to multiple customized tables
Solution Approach 1:
The patent applies preliminary action by pre-generating and storing multiple cell-specific CQI tables at the base station before they are needed. When a cell's characteristics change or a new cell is added, the corresponding CQI table is already prepared and can be quickly deployed to mobile devices, reducing the information loss and delay associated with real-time table generation.
Solution Approach 2:
The patent implements feedback mechanisms where mobile devices report measured channel quality and CQI table performance back to the base station. This feedback loop allows the base station to continuously refine and update CQI tables, ensuring that the information contained in the tables remains accurate and relevant, thereby minimizing information loss over time.
3Ease of operation
If fixed length CQI messages are used, then transmission simplicity is improved, but adaptability deteriorates when representing varying ranges of CQI values across different cells
Solution Approach 1:
The patent applies dynamics by making CQI message lengths adaptable rather than fixed. The base station can dynamically adjust the number of bits used to represent CQI values based on the specific cell's channel conditions and the range of CQI values observed. This allows the system to maintain transmission simplicity in cells with limited CQI ranges while gaining adaptability in cells with broader ranges.
Solution Approach 2:
The patent achieves universality by designing a CQI messaging framework that can handle both fixed and variable length messages. The base station can select the appropriate message format based on cell characteristics, allowing the same system to serve diverse cell types effectively. The CQI table structure itself is universal, but its instantiation can be adapted to different cells' needs.
Data Source
AI summary
Channel Quality Indicator (CQI) tables are tailored to one or more cells of interest. Tailoring CQI tables to individual cells permits devices such as radio base stations to more reliably and accurately allocate radio resources to those cells since channel conditions vary from cell to cell. According to one embodiment, a table of CQI values is composed by analyzing information indicating channel quality in a cell of interest and generating at least one table of CQI values tailored to the cell of interest based on the information analyzed. The tailored CQI table may be deployed to another device for use in reporting channel quality information. The device may report channel quality by accessing the tailored CQI and identifying the range of CQI values that includes a channel quality estimate derived by the device. The device generates a channel quality information message based on the identified range of CQI values.