HARQ Soft Combining Configuration for Wireless UEs
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Solution Overview
Problem
Wireless communication systems face challenges in managing finite channel resources due to signal attenuation and blocking in complex environments, which affects HARQ soft combining mechanisms, requiring improvements to optimize resource usage.
Innovation Solution
A method for configuring HARQ soft combining on a subset of HARQ processes supported by user equipment (UE), where the base station receives capability information from the UE and transmits configuration information to perform soft combining on a subset of HARQ processes, reducing the need for large soft buffers and minimizing uplink-downlink switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ soft combining is performed on all supported HARQ processes, then decoding performance is improved, but device complexity and memory requirements increase
Solution Approach 1:
The patent segments the set of HARQ processes into two subsets: a first subset for which soft combining is configured and a second subset for which soft combining is not configured. This segmentation allows the UE to apply soft combining selectively to only those HARQ processes that benefit most from it, thereby reducing the overall soft buffer requirements while maintaining decoding performance for critical processes.
Solution Approach 2:
The patent applies different quality levels of HARQ processing to different subsets of HARQ processes. The first subset receives high-quality processing with soft combining enabled, while the second subset receives standard processing without soft combining. This local differentiation optimizes resource allocation by applying enhanced processing only where necessary.
2Productivity
If the number of HARQ processes is increased, then communication throughput is improved, but the size of soft buffers required increases
Solution Approach 1:
By segmenting HARQ processes into subsets with different soft combining configurations, the system can support a larger total number of HARQ processes for improved throughput while limiting the soft buffer allocation only to the first subset where soft combining is enabled, thus controlling memory requirements.
Solution Approach 2:
The patent applies soft combining partially to only a subset of HARQ processes rather than all processes. This partial application is sufficient to maintain decoding performance for the most critical processes while avoiding the excessive memory requirements that would result from applying soft combining to all HARQ processes.
3Reliability
If soft combining is configured for more HARQ processes, then error correction capability is improved, but overhead and processing complexity increase
Solution Approach 1:
The patent segments HARQ processes to apply error correction via soft combining only to the first subset where it provides the most benefit. This selective approach improves error correction capability for critical processes while avoiding the processing complexity overhead that would result from enabling soft combining on all HARQ processes.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for configuring hybrid automatic repeat request (HARQ) soft combining for a subset of HARQ processes supported by a user equipment (UE). A method performed by the UE generally includes transmitting capability information indicating a capability of the UE to perform hybrid automatic repeat request (HARQ) soft combining and receiving, based on the capability information, configuration information from the BS configuring the UE to perform soft combining on only a subset of a set of HARQ processes.