Wireless Feedback Symbol Rearrangement for LTE Uplink Efficiency
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Solution Overview
Problem
The asymmetrical radio frame lengths in uplink and downlink channels of LTE and HSPA systems lead to inefficient use of channel resources due to unused HARQ feedback symbols in the uplink direction, resulting in resource wastage.
Innovation Solution
The method involves rearranging the order of feedback symbols corresponding to the first downlink component carriers, mapping them into portions, and sending them via an uplink carrier with the same frame length as the second downlink carrier, optimizing the radio interface by utilizing available slots effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If HARQ feedback symbols are transmitted using the conventional mapping method, then the feedback is sent reliably, but channel resources are wasted due to unused feedback symbols
Solution Approach 1:
The feedback symbols are segmented into two groups: first feedback symbols corresponding to first downlink component carriers and second feedback symbols corresponding to second downlink component carriers. This segmentation allows selective mapping and transmission of only necessary feedback symbols, eliminating waste of channel resources while maintaining reliability.
Solution Approach 2:
The patent extracts and transmits only the necessary first feedback symbols corresponding to first downlink component carriers, while removing unnecessary second feedback symbols that would correspond to second downlink component carriers. This extraction principle eliminates resource waste by transmitting only essential feedback information.
2Productivity
If feedback symbols are mapped in sequential order, then the mapping is simple, but resources are wasted due to asymmetrical frame lengths
Solution Approach 1:
The feedback symbols are divided into segments based on their corresponding downlink component carriers. First feedback symbols are mapped to uplink resources in a manner that aligns with the shorter frame length, while second feedback symbols are excluded from transmission. This segmented approach improves resource utilization without excessive complexity.
Solution Approach 2:
The patent changes the mapping parameters by selectively mapping only first feedback symbols to uplink resources, rather than mapping all feedback symbols sequentially. This parameter change optimizes resource utilization by adapting the mapping strategy to the asymmetrical frame length conditions.
Data Source
AI summary
An apparatus and method for wireless communication uses carrier aggregation (LTE, HSPA) having an improved feedback operation that optimises the radio interface for the uplink direction (LTE).