Split Radio Bearer Data Validation for Critical Machine-Type Communication
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Solution Overview
Problem
Existing radio communication systems, such as LTE, fail to meet the high reliability requirements of Critical Machine-Type Communication (CMTC) due to residual errors in data transfer, particularly because error detection and correction are not adequately implemented beyond the Physical (PHY) layer, leading to insufficient reliability and availability.
Innovation Solution
The method involves using at least two second-layer entities in the protocol stack for error detection and validation, such as the Radio Link Control (RLC) layer, to increase data transfer reliability by comparing and validating data consistency across these entities, and triggering retransmissions as needed, without modifying the lower protocol layers, thereby enhancing reliability without increasing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing radio communication protocols (LTE) with 24-bit CRC are used, then the system maintains simplicity and low latency, but the reliability remains insufficient with residual error probability of 1E-7
Solution Approach 1:
The patent segments the data transmission path by introducing multiple independent second layer entities (RLC entities) parallel to the existing protocol stack. Each entity processes data independently with its own error detection, creating multiple redundant transmission paths that collectively improve reliability without modifying the underlying PHY layer or increasing overall system complexity significantly
Solution Approach 2:
The patent creates copies of data through multiple second layer entities that independently process and validate the same data. By duplicating the error detection mechanism across multiple entities and comparing results, the system achieves higher reliability (reducing error probability from 1E-7 to 1E-14) while maintaining protocol simplicity
2Reliability
If multiple transmission paths are introduced to increase reliability, then error probability decreases exponentially, but system complexity and processing overhead increase
Solution Approach 1:
The patent performs error detection and validation in advance through multiple parallel second layer entities before data reaches higher layers. By pre-validating data consistency across multiple entities at the RLC layer, the system eliminates the need for complex retransmission protocols at higher layers, reducing overall processing time and latency despite the additional validation steps
Solution Approach 2:
The multiple second layer entities autonomously perform error detection and validation without requiring external intervention or complex coordination. Each entity independently validates data and the system automatically compares results, enabling self-service validation that improves reliability without proportionally increasing processing overhead
Data Source
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AI summary
A technique for transferring data on a radio bearer is described. The split radio bearer includes a first layer entity (570) at a first layer of a protocol stack and at least two second layer entities at a second layer of the protocol stack. The second layer is lower than the first layer in the protocol stack. In a method aspect of the technique, the data is received through each of the at least two second layer entities (582, 584). The data received through the at least two second layer entities (582, 584) is validated. If a result of the validation is indicative of an inconsistency in the data received through the at least two second layer entities (582, 584), a retransmission of the data is selectively triggered through at least one of the second layer entities (582, 584).