Wireless Sequence Mapping Outside Control Regions
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently mapping sequences, particularly ACK/NACK signals, to resource elements in a manner that optimizes time-frequency resource utilization without interfering with existing control channels.
Innovation Solution
A method and apparatus for mapping sequences to resource elements in wireless communication systems, where modulation symbols are determined and mapped to resource blocks positioned outside OFDM symbol regions, allowing for efficient allocation and transmission of ACK/NACK signals by utilizing resource blocks not allocated to specific UEs and employing specific mapping strategies in the frequency or time domain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sequences are mapped to resource elements in existing control channel regions, then resource utilization is maximized, but interference with control channels occurs and reliability deteriorates
Solution Approach 1:
The resource elements are segmented into different regions: control channel regions (where PCFICH is located) and data transmission regions (other resource elements). The invention maps sequences only to resource elements outside the control channel regions, thereby separating control and data functions to avoid interference while maintaining resource utilization.
2Reliability
If ACK/NACK signals are transmitted using dedicated resource blocks, then signal reliability is improved, but resource allocation complexity increases
Solution Approach 1:
The invention enables resource blocks not allocated to specific UEs to serve dual purposes: maintaining system resource structure while being repurposed for ACK/NACK sequence transmission. This multi-functional use of resource blocks improves signal reliability without requiring entirely dedicated resources, thereby reducing allocation complexity.
3Productivity
If sequences are mapped to resource elements in all resource blocks, then resource efficiency is improved, but mapping complexity increases
Solution Approach 1:
The invention applies different mapping rules to different regions of resource elements: control channel regions are excluded from sequence mapping, while other resource elements are used for sequence mapping. This localized approach maintains resource efficiency by utilizing available resources while simplifying the mapping process through clear regional differentiation.
Data Source
AI summary
A method for mapping a sequence in a wireless communication system includes determining one or more resource blocks to which the sequence will be mapped, and mapping a plurality of modulation symbols to a plurality of resource elements included in the resource blocks, wherein the resource elements are positioned in regions other than OFDM symbol regions indicated by a physical control format indicator channel (PCHICH).