ACKCH Resource Allocation via Implicit Mapping and CDM
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in resource allocation for ACK/NACK signals, leading to increased overhead and interference, particularly in environments with poor channel conditions, where Hybrid ARQ techniques struggle to maintain system reliability and reduce retransmission requests.
Innovation Solution
The method involves implicit mapping of ACKCH resources to data channel Resource Blocks (RBs) or control channel elements, allowing for uniform frequency allocation and reducing interference by spreading ACKCH resources across the entire system band, utilizing Code Division Multiplexing to distinguish between ACKCHs, thereby improving frequency diversity and inter-cell interference diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If ACKCH resources are allocated using conventional methods with explicit mapping, then resource allocation flexibility is improved, but signaling overhead increases and frequency diversity is reduced
Solution Approach 1:
The ACKCH resource allocation is made self-configuring through implicit mapping rules. The UE autonomously determines ACKCH resources based on pre-defined mapping relationships with data channel RBs or control channel CCEs, eliminating the need for explicit downlink signaling and reducing overhead while maintaining allocation flexibility
Solution Approach 2:
The patent changes the allocation parameter from explicit signaling to implicit mapping rules. By defining ACKCH resources as functions of data channel or control channel resource indices, the system achieves flexible resource allocation without the overhead of explicit signaling messages
2Device complexity
If ACKCH resources are concentrated in specific frequency regions, then resource allocation simplicity is improved, but interference increases and frequency diversity is reduced
Solution Approach 1:
The patent segments ACKCH resources across the entire system bandwidth by mapping them to different frequency regions based on the indices of data channel RBs or control channel CCEs. This segmentation distributes ACKCH transmissions across multiple frequency regions, reducing concentration and improving frequency diversity while maintaining allocation simplicity through systematic mapping
Solution Approach 2:
The patent introduces frequency dimension diversity by mapping ACKCH resources to different frequency positions based on resource indices. Instead of concentrating ACKCH in one frequency region, the mapping spreads them across the frequency spectrum, utilizing the frequency dimension to achieve diversity and reduce interference
3Productivity
If multiple ACKCHs share the same frequency resources, then resource utilization efficiency is improved, but interference between ACKCHs increases
Solution Approach 1:
The patent merges multiple ACKCH resources into the same physical frequency resources through Code Division Multiplexing (CDM). Different UEs' ACKCH signals are combined in the code domain using orthogonal codes, allowing efficient resource utilization while maintaining signal distinguishability and reducing interference through code orthogonality
Data Source
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AI summary
A method for allocating physical resources to an Acknowledgement (ACK)/Negative Acknowledgement (NACK) signal channel representative of a response signal in a wireless communication system. The method includes grouping ACK/NACK signal channels corresponding to a plurality of resource blocks used for transmission of a data channel or a control channel into a plurality of groups so ACK/NACK signal channels having consecutive indexes do not belong to the same group; and allocating same frequency resources to ACK/NACK signal channels belonging to the same ACK/NACK signal channel group and allocating orthogonal sequences so ACK/NACK signal channels in each ACK/NACK signal channel group are distinguished in a code domain.