Redundancy Version Pattern for Random Access Uplink Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in ensuring reliable and efficient uplink traffic transmissions during random access procedures, often resulting in collisions and reduced network performance due to contention among mobile devices.
Innovation Solution
The implementation of redundancy version (RV) patterns for repeated transmissions of uplink messages, where each repetition is configured with a respective RV from a sequence, enhances the likelihood of successful reception by the base station, improving reliability and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple mobile devices transmit data simultaneously during random access procedures, then network capacity and throughput increase, but transmission collisions occur reducing reliability
Solution Approach 1:
The patent segments the uplink message transmission into multiple repetitions, where each repetition is encoded with a different redundancy version (RV). This segmentation allows the base station to receive multiple versions of the same message and combine them to improve decoding reliability, thus resolving the contradiction between maintaining high network capacity and ensuring transmission reliability during random access procedures.
Solution Approach 2:
The patent changes the redundancy version parameter across multiple message repetitions. By varying the RV parameter (e.g., RV0, RV1, RV2, RV3) for each repetition, the system optimizes the likelihood of successful message recovery at the base station. This parameter change strategy enables reliable communication even when multiple devices transmit simultaneously, addressing the reliability issue without reducing network capacity.
2Reliability
If message repetitions are transmitted with different redundancy versions, then reception reliability improves, but transmission time and latency increase
Solution Approach 1:
The patent implements a balance between transmitting enough message repetitions to ensure reliable reception but not so many that latency becomes excessive. By using a limited set of redundancy versions (typically 4 versions: RV0-RV3) and determining when sufficient repetitions have been transmitted, the system achieves reliable message recovery without unnecessarily extending transmission time, thus resolving the contradiction between reception reliability and transmission latency.
3Reliability
If redundancy version patterns are implemented for message repetitions, then uplink transmission reliability increases, but system complexity increases
Solution Approach 1:
The patent manages system complexity by systematically changing the redundancy version parameter according to predefined patterns rather than using complex adaptive algorithms. The base station and user equipment follow standardized RV sequences (e.g., 0, 2, 3, 1), which simplifies implementation while still providing the reliability benefits of multiple redundancy versions. This approach resolves the contradiction by achieving high reliability through simple, standardized parameter changes.
Data Source
AI summary
Aspects of the disclosure relate to random access procedures. In one example, a UE initiates a random access procedure with a base station, and receives a random access response (RAR) message from the base station in response to the initiating of the random access procedure. The UE further determines a redundancy version (RV) pattern comprising a sequence of a plurality of RVs. The UE also transmits an uplink (UL) communication to the base station as part of the random access procedure. The UL communication comprises a plurality of repetitions of a UL message, each repetition being an iteration of the UL message that is configured by applying a respective RV of the plurality of RVs to the UL message based on the sequence. The UE further receives a downlink message from the base station based on the UL message. Other aspects, embodiments, and features are also claimed and described.