Reference Signal Sequence Generation with UE-Specific Hopping Override
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Solution Overview
Problem
In wireless communication systems, especially in multi-user MIMO environments, ensuring orthogonality between reference signals from user equipment with different bandwidths is challenging, leading to potential interference and reduced throughput due to the complexity of cell planning and existing sequence hopping methods.
Innovation Solution
A method where user equipment generates a reference signal sequence based on both cell-specific and user equipment-specific sequence hopping parameters, allowing the user equipment-specific parameter to override the cell-specific parameter, thereby determining whether to apply sequence hopping, ensuring orthogonality and efficient resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell-specific sequence hopping parameter is used for reference signal generation, then orthogonality between reference signals can be maintained, but user equipment with different bandwidths experience interference and throughput reduction
Solution Approach 1:
The patent introduces dynamic sequence hopping parameters that can be independently configured for different user equipments. The user equipment-specific sequence hopping parameter allows each UE to have customized sequence hopping behavior, enabling the system to dynamically adapt to different bandwidth configurations and user requirements, thereby resolving the conflict between maintaining orthogonality and supporting multi-user MIMO with different bandwidths
Solution Approach 2:
The patent applies different sequence hopping parameters to different user equipments based on their specific bandwidth configurations. By localizing the parameter configuration to each UE rather than using a uniform cell-specific parameter, the system can optimize reference signal generation for each user's specific conditions, ensuring both orthogonality and efficient resource allocation
2Device complexity
If existing sequence hopping methods are used, then reference signal generation is simplified, but user equipment with different bandwidths experience interference and reduced throughput
Solution Approach 1:
The patent segments the sequence hopping parameter into two independent components: a cell-specific parameter and a user equipment-specific parameter. This segmentation allows the system to maintain the simplicity of cell-level configuration while adding user-specific customization, thereby improving throughput for multi-user MIMO without significantly increasing overall system complexity
3Ease of manufacture
If cell planning complexity is reduced, then deployment is easier, but orthogonality between user equipment with different bandwidths cannot be guaranteed
Solution Approach 1:
The patent enables user equipments to self-configure their reference signal generation parameters based on their specific bandwidth and identification. The user equipment-specific sequence hopping parameter allows each UE to automatically determine its appropriate sequence hopping behavior without requiring complex manual cell planning, thereby simplifying deployment while maintaining orthogonality through self-service parameter selection
Data Source
AI summary
A method and a user equipment (UE) for generating a reference signal sequence in a wireless communication system are discussed. The method according to an embodiment includes receiving a cell-specific sequence hopping parameter from a base station. The cell-specific sequence hopping parameter is used to enable a sequence hopping for a plurality of UEs in a cell if a cell-specific group hopping parameter is used to disable a group hopping for the plurality of UEs in the cell. The method includes receiving a UE-specific sequence group hopping (SGH) parameter, specified to the UE, from the base station. The UE-specific SGH parameter is used to disable the sequence hopping, enabled by the cell-specific sequence hopping parameter. The method includes generating the reference signal sequence based on a base sequence number within a base sequence group. The base sequence number within the base sequence group is determined by the UE-specific SGH parameter.