Variable Code Rate Tail Portion for Low Latency Wireless Acknowledgment
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Solution Overview
Problem
Wireless communication systems face inefficiencies due to high processing requirements for acknowledging receipt of data transmissions, leading to increased latency and reduced throughput, particularly in scenarios where automatic repeat request (ARQ) and hybrid ARQ (HARQ) schemes are employed.
Innovation Solution
Implementing different coding schemes for various portions of a data transmission, where a reduced code rate or block size is used in a tail portion to decrease processing requirements, allowing for quicker acknowledgment generation and reducing latency, while using enhanced channel estimation for more robust reception and decoding in other portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a uniform high code rate is used throughout the data transmission, then throughput is maximized, but processing time for acknowledgment increases and latency increases
Solution Approach 1:
The data transmission is divided into multiple portions with different code rates. The first portion uses a first code rate while the second portion uses a second code rate that is lower than the first code rate. This segmentation allows different parts of the transmission to be optimized for different purposes, reducing overall processing time while maintaining throughput.
Solution Approach 2:
Different portions of the data transmission are assigned different code rates based on their specific requirements. The tail portion uses a lower code rate to reduce processing complexity and time for acknowledgment generation, while other portions maintain higher code rates for efficient data transmission. This local optimization resolves the contradiction between throughput and processing time.
2Ease of operation
If a reduced code rate is used in the tail portion, then processing requirements are decreased and acknowledgment latency is reduced, but transmission efficiency in that portion decreases
Solution Approach 1:
The reduced code rate is applied only to the tail portion of the transmission rather than the entire data packet. This partial application of the reduced code rate achieves the goal of reducing processing requirements for acknowledgment generation while limiting the impact on overall transmission efficiency. The majority of the data transmission can maintain higher code rates for efficiency.
3Reliability
If enhanced channel estimation is used, then reception reliability is improved, but processing complexity increases
Solution Approach 1:
The transmission is segmented into portions with different coding characteristics, allowing enhanced channel estimation to be applied selectively. The first portion can use simpler estimation while the second portion benefits from the enhanced estimation, balancing reliability improvements with processing complexity management.
Data Source
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AI summary
Techniques are provided for reduction of processing requirements for portions of a received transmission relative to processing requirements for other portions of the same transmission. Different coding schemes may be employed for portions of a data transmission. In some examples, a tail portion of a data transmission may use a coding scheme that had reduced processing requirements relative to other portions of the data transmission. The reduced processing requirements may allow a receiver to generate an acknowledgment of receipt relatively quickly, which may reduce latency for acknowledging receipt of a transmission.