Decoding Margin Estimation for Wireless Device Throughput
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Solution Overview
Problem
In LTE communication systems, existing control loops for determining UE-specific Modulation and Coding Scheme (MCS) are conservative due to challenges in adjusting transmission properties for resource-efficient levels without allowing block errors, leading to reduced system throughput and increased resource usage.
Innovation Solution
A method in a wireless device to determine a decoding margin by creating punctured versions of received transport blocks with reduced encoding redundancy, allowing evaluation of transmission properties without network involvement, and transmitting this information to the radio network node to reconfigure transmission properties, thereby avoiding block errors and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conservative MCS selection is used to avoid block errors, then communication reliability is improved, but system throughput deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the wireless device measures decoding margins on successfully decoded transport blocks and reports this information to the base station. The base station uses this feedback to adaptively adjust MCS selection, transitioning from conservative fixed margins to dynamic margin adjustment based on actual channel conditions and device decoding capabilities, thereby resolving the contradiction between reliability and throughput
Solution Approach 2:
The patent introduces dynamic adjustment of decoding margins based on measured performance metrics. Instead of using fixed conservative margins, the system dynamically adapts MCS selection and decoding margins according to real-time channel conditions and device-specific characteristics, enabling the system to optimize the balance between reliability and throughput
2Reliability
If conservative transmission properties are used, then block error rate is reduced, but resource usage increases
Solution Approach 1:
The system uses feedback from decoding margin measurements to optimize resource allocation. By reporting actual decoding performance, the base station can allocate resources more efficiently, using less redundancy for devices with good decoding margins while maintaining reliability for those with poorer margins, thus reducing overall resource consumption while maintaining block error rate performance
Solution Approach 2:
The patent changes the parameter of decoding margin from a fixed conservative value to a dynamically adjusted parameter based on measured performance. This allows the system to use fewer resources (lower redundancy) when conditions permit while maintaining the required reliability level, directly addressing the contradiction between block error rate and resource usage
3Productivity
If aggressive MCS selection is used to improve throughput, then system throughput is improved, but block error rate increases
Solution Approach 1:
The patent enables dynamic adaptation of MCS selection based on measured decoding margins. The system can aggressively select higher MCS indices when decoding margins indicate good conditions, improving throughput, while automatically becoming more conservative when margins deteriorate, thus dynamically optimizing the trade-off between throughput and block error rate
Solution Approach 2:
The feedback mechanism provides real-time information about decoding performance, allowing the base station to adjust MCS selection aggressiveness accordingly. When feedback indicates good decoding margins, the system can afford more aggressive MCS selection for higher throughput; when margins are poor, the system reduces aggressiveness to maintain reliability, resolving the contradiction between throughput and block error rate
Data Source
AI summary
The present disclosure relates to methods and devices for determining transmission properties for communication between a wireless device and a radio network node. The disclosure also relates to computer programs performing the methods. The disclosure proposes a method, performed in the wireless device, comprising receiving a transport block from a radio network node, creating one or more punctured versions of the transport block, wherein an encoding redundancy of the punctured versions of the transport block is reduced compared to that of the original transport block, decoding at least one of the one or more punctured versions of the transport block and determining a decoding margin associated with the original transport block, based on the decoding of the one or more punctured versions of the transport block. The disclosure also proposes a method in the radio network node.