Communication Sequence Allocation for Interference Management
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Solution Overview
Problem
In communication systems, particularly in SC-FDMA, the allocation of sequences with different lengths leads to complex interference issues due to varying correlation characteristics, making it challenging to manage interference between cells and users effectively.
Innovation Solution
The method involves dividing sequences into sub-groups based on their time-frequency resource occupation modes and selecting sequences that minimize specific function values, such as |ri/Ni − ck/Np1| or |(ri/Ni − ck/Np1) modu mk,i|, to ensure high correlation within groups and low correlation between groups, thereby reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sequences of different lengths are allocated to cells and users, then the system can support more users and cells with flexible resource allocation, but the interference management becomes complex due to varying correlation characteristics
Solution Approach 1:
The patent changes the parameter of sequence length and organizes sequences into groups where each group contains sequences of the same length. By controlling the sequence length parameter within groups and managing correlation characteristics between groups, the system achieves flexible resource allocation while simplifying interference management through structured organization.
Solution Approach 2:
The patent segments the sequence space into multiple groups, where each group contains sequences of a specific length. This segmentation allows independent management of sequences with different correlation characteristics, enabling flexible allocation to different users and cells while maintaining manageable interference levels through group-based organization.
2Productivity
If sequences with high correlation are allocated to different cells, then resource utilization efficiency improves, but inter-cell interference increases
Solution Approach 1:
The patent applies local quality by assigning sequences with specific correlation characteristics to specific cells based on their local interference conditions. Cells can be allocated sequences from different groups with appropriate correlation properties, allowing high resource utilization in some areas while controlling interference in others through localized sequence selection.
Solution Approach 2:
The patent changes the correlation parameter of allocated sequences by selecting from multiple groups with different sequence lengths and correlation characteristics. This allows dynamic adjustment of interference levels while maintaining high resource utilization efficiency through parameter-based sequence selection.
3Device complexity
If sequences of the same length are used across all cells, then interference management becomes simpler, but the system loses flexibility in supporting users with different resource requirements
Solution Approach 1:
The patent segments sequences into multiple groups based on length while maintaining that sequences within each group have the same length. This segmentation provides simplicity in interference management within each group while enabling flexibility across groups to support users with different resource requirements through inter-group allocation.
Solution Approach 2:
The patent creates a universal sequence allocation framework where multiple groups of sequences with different lengths can serve different user types and resource requirements. Each group maintains simple correlation characteristics for easy management, while the collection of groups provides universal support for diverse allocation scenarios.
4Object-generated harmful factors
If sequences with low correlation are allocated to different users, then user-specific interference is reduced, but the overall resource utilization efficiency decreases
Solution Approach 1:
The patent changes the correlation parameter selectively by allocating sequences with appropriate correlation levels from different groups to different users. Users experiencing interference can be assigned sequences with lower correlation, while users in favorable conditions can use sequences with higher correlation for better resource utilization, achieving a balance through parameter-based allocation.
Solution Approach 2:
The patent applies local quality by tailoring the correlation characteristic of allocated sequences to each user's specific interference environment. Users in high-interference scenarios receive sequences with lower correlation to their neighbors, while users in low-interference scenarios can utilize sequences with higher correlation, optimizing both interference reduction and resource efficiency locally.
Data Source
AI summary
A method and apparatus for allocating and processing sequences in a communication system is disclosed. The method includes: dividing sequences in a sequence group into multiple sub-groups, each sub-group corresponding to its own mode of occupying time frequency resources; selecting sequences from a candidate sequence collection corresponding to each sub-group to form the sequences in the sub-group by: the sequences in a sub-group i in a sequence group k being composed of n sequences in the candidate sequence collection, the n sequences making a |ri/Ni−ck/Np<sub2>1</sub2>| or |(ri/Ni−ck/Np<sub2>1</sub2>) modu mk,i| function value the smallest, second smallest, till the nth smallest respectively; allocating the sequence group to cells, users or channels. It prevents the sequences highly correlated with the sequences of a specific length from appearing in other sequence groups, thus reducing interference, avoiding the trouble of storing the lists of massive sequence groups.