Zadoff-Chu Sequence Allocation for Inter-Cell Interference
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Solution Overview
Problem
Existing sequence allocating methods in cellular radio communication systems face challenges in reducing cross-correlation between different sequence groups while maintaining the number of Zadoff-Chu sequences forming sequence groups, particularly due to fixed thresholds that affect the number of ZC sequences allocated and increase cross-correlation when the number of RBs or sequence length changes.
Innovation Solution
A dynamic sequence allocating method that sets a first threshold based on the sequence length N, selecting Zadoff-Chu sequences with a difference between rb/Nb and r/N equal to or less than this threshold, and allocates them to the same cell, allowing for adaptive adjustment of the threshold with the number of RBs to maintain sequence group size and reduce cross-correlation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed threshold is used for sequence allocation, then the sequence group size is maintained, but the cross-correlation increases when the number of RBs or sequence length changes
Solution Approach 1:
The patent applies dynamics by making the threshold variable rather than fixed. The threshold is dynamically adjusted based on the sequence length N and the number of RBs, allowing the system to adapt to different transmission conditions while maintaining both sequence group size consistency and cross-correlation control.
Solution Approach 2:
The patent changes the parameter threshold from a fixed value to a variable that depends on sequence length and RB count. By expressing the threshold as a function of these parameters, the system can maintain optimal performance across different operating conditions without sacrificing sequence group size consistency.
2Area of stationary object
If the number of RBs increases, then the transmission bandwidth increases, but the fixed threshold causes incorrect sequence allocation
Solution Approach 1:
The patent addresses this by making the threshold a function of the number of RBs and sequence length. As the transmission bandwidth and number of RBs change, the threshold automatically adjusts to maintain the correct number of sequences in each group, ensuring accurate sequence allocation across different bandwidth configurations.
3Adaptability or versatility
If ZC sequences of different sequence lengths are multiplexed, then the data transmission bandwidth flexibility increases, but the cross-correlation between sequences increases
Solution Approach 1:
The patent resolves this contradiction by dynamically adjusting the threshold based on sequence length. When ZC sequences of different lengths are multiplexed to provide bandwidth flexibility, the threshold adapts to each sequence length, ensuring that the number of sequences per group remains controlled and cross-correlation is minimized.
Data Source
AI summary
It is an object to provide a sequence allocating method that, while maintaining the number of Zadoff-Chu sequences to compose a sequence group, is configured to make it possible to reduce correlations between different sequential groups. This method comprises the steps of setting a standard sequence with a standard sequence length and a standard sequence number in a step, setting a threshold value in accordance with an RB number in a step, setting a sequence length corresponding to RB number in a step, judging whether ¦r/N−rb/Nb¦=Xth(m) is satisfied in a step, including a plurality of Zadoff-Chu sequences with a sequence number and a sequence length in a sequence group in a step if the judgment is positive, and allocating the sequence group to the same cell in a step.