CAZAC Sequence Grouping for Low-Interference Cell Allocation
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Solution Overview
Problem
Existing methods for allocating CAZAC sequences in communication systems lead to excessive occupation of wireless network resources and potential signal interference between cells due to inadequate consideration of time-frequency resource overlap and sequence correlation.
Innovation Solution
A method and apparatus that allocate a sequence group containing sequences with high correlation for specific time-frequency resources, avoiding signaling transmission and minimizing resource usage by ensuring sequences with high correlation are grouped together, thus reducing signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If CAZAC sequences are allocated separately for each occupation mode of time-frequency resources, then the sequence allocation can be precisely controlled for different resource modes, but the wireless network resources are excessively occupied and signaling transmission overhead increases
Solution Approach 1:
The patent merges the allocation of CAZAC sequences across multiple occupation modes by grouping sequences with high correlation into the same sequence group. This allows a single sequence group allocation to serve multiple occupation modes simultaneously, reducing signaling overhead and wireless resource occupation while maintaining precise control over sequence allocation for different resource modes.
Solution Approach 2:
The patent creates sequence groups that can be universally applied across different occupation modes of time-frequency resources. By ensuring sequences within a group have high correlation, the same sequence group can be allocated to multiple occupation modes, making the allocation mechanism multi-functional and reducing the need for separate allocations for each mode.
2Object-affected harmful factors
If different CAZAC sequences are allocated to cells with overlapping time-frequency resources, then signal interference between cells is reduced, but the sequence correlation control becomes complex and difficult to manage
Solution Approach 1:
The patent applies local quality by differentiating sequence correlation properties within sequence groups. Sequences within the same group have high correlation (suitable for intra-cell allocation), while sequences from different groups have low correlation (suitable for inter-cell allocation). This local differentiation of correlation quality simplifies the allocation process while effectively controlling signal interference between cells.
Solution Approach 2:
The patent changes the correlation parameter of CAZAC sequences by organizing them into sequence groups with controlled correlation properties. By selecting sequences with high correlation for the same group and low correlation for different groups, the patent transforms the complex problem of interference control into a simpler group-based allocation problem, reducing allocation complexity while maintaining interference mitigation.
3Object-affected harmful factors
If sequences with low correlation are allocated to different cells, then signal interference is minimized, but the wireless network resources are wasted due to insufficient resource utilization
Solution Approach 1:
The patent segments the CAZAC sequences into sequence groups based on correlation properties. This segmentation allows efficient utilization of sequences within groups for cells with non-overlapping resources (high correlation acceptable) while maintaining low correlation between groups for cells with overlapping resources. This segmented approach improves resource utilization by allowing more flexible sequence reuse without causing interference.
Solution Approach 2:
The patent introduces dynamic sequence allocation by allowing the same sequence group to be allocated to multiple occupation modes and multiple cells depending on resource overlap conditions. This dynamic approach optimizes resource utilization by adapting sequence allocation to the specific resource configuration, reducing waste while maintaining interference control through the correlation properties of sequence groups.
Data Source
AI summary
A sequence distributing and sequence processing method and apparatus in a communication system are provided. The sequence distributing method includes the following steps: generating sequence groups including a number of sequences, the sequences in the sequence groups are determined according to the sequence time frequency resource occupation manner which is supported by the system; distributing the sequence groups to cells. The method avoids the phenomenon that signaling transmission is needed to distribute the sequences to the cells for different time frequency resource occupation manner, and saves in so far as possible the wireless network transmission resource occupied during the process of distributing the sequences through distributing the sequence groups comprising a number of sequences to the cells.