PUCCH Format 3 Resource Mapping for Interference Suppression
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Solution Overview
Problem
In LTE wireless communication systems, the allocation of transmission resources for PUCCH format 3 is not adequately defined, leading to inefficiencies in interference suppression and resource utilization due to insufficient cyclic shift separation and DM-RS mapping, which affects performance in congested networks.
Innovation Solution
The proposed solution involves defining the mapping of PUCCH format 3 resources to physical resource blocks (PRBs) with variable configurations, including cyclic shift hopping and orthogonal cover code remapping to increase cyclic shift separation and improve interference suppression, and implementing a new parameter for dynamic PRB allocation to enhance scheduler flexibility and interference mitigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUCCH format 3 resources are mapped to physical resource blocks using conventional methods, then resource allocation is simple, but interference suppression performance deteriorates due to insufficient cyclic shift separation
Solution Approach 1:
The patent changes the mapping parameters by introducing variable cyclic shift values and orthogonal cover code indices based on resource block allocation. Specifically, different cyclic shift separations (e.g., 7.5, 10, 15) are applied to different resource blocks, and orthogonal cover code indices are dynamically selected based on the resource block index, thereby improving interference suppression without requiring complete redesign of the mapping structure
Solution Approach 2:
The patent introduces dynamic adaptation by allowing the cyclic shift and orthogonal cover code selection to vary based on the allocated resource block. The mapping is no longer static but adapts to different resource allocations, enabling the system to optimize interference suppression performance dynamically according to the specific resource block assignment
2Productivity
If fixed PRB allocation is used for PUCCH format 3, then scheduling is simple, but resource utilization efficiency deteriorates in congested networks
Solution Approach 1:
The patent enables dynamic PRB allocation for PUCCH format 3 by introducing flexible mapping rules that allow the eNodeB to assign different resource blocks based on network conditions and traffic demands. This dynamic approach replaces fixed allocation, improving resource utilization efficiency while the mapping rules maintain sufficient structure to avoid excessive scheduling complexity
Solution Approach 2:
The patent segments the PUCCH format 3 resource space into multiple physical resource blocks with different mapping characteristics. Each resource block can be independently allocated and configured with appropriate cyclic shift and orthogonal cover code parameters, allowing the system to efficiently utilize available resources by selecting appropriate segments for different UEs based on network conditions
3Quantity of substance
If cyclic shift separation is minimized for resource efficiency, then resource utilization improves, but interference between adjacent resources increases
Solution Approach 1:
The patent applies different cyclic shift separation values to different local regions (resource blocks) of the PUCCH format 3 resource space. Instead of using a uniform cyclic shift separation across all resources, the system applies locally optimized separation values (e.g., larger separation at edges, smaller separation in center) to maximize resource utilization while maintaining adequate interference protection in each local region
Solution Approach 2:
The patent extends the interference mitigation approach from a single-dimensional cyclic shift separation to a two-dimensional solution by also utilizing orthogonal cover code differentiation. This allows the system to pack resources more densely in the cyclic shift dimension while maintaining interference suppression through orthogonal cover code separation, effectively adding another dimension to the resource separation strategy
Data Source
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AI summary
A wireless communication method includes allocating physical uplink control channel (PUCCH) data in first slot to a first orthogonal cover code (OCC). The method also includes allocating PUCCH data in a second slot of the same subframe to a different orthogonal cover code (OCC). Another method includes mapping PUCCH resources to physical resource blocks based on a user equipment (UE) specific signaling parameter (e.g., a resource index) and a number of symbols in a slot of a subframe.