Redundancy Version Sequence Design for Wireless Repetition
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Solution Overview
Problem
Current wireless communication systems, such as 3GPP and LTE, face challenges in supporting devices in extreme coverage scenarios like basements or buildings with metalized insulation, where additional penetration losses occur, requiring repeated transmissions that existing techniques struggle to manage effectively.
Innovation Solution
The implementation of a repetition mechanism that selects a Redundancy Version (RV) sequence for repeated transmissions, configures each repetition with specific RV values, and determines a repetition time interval (RTI) to ensure self-decodability within one time block or across multiple blocks, allowing for efficient power management and simplified scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repeated transmissions are used to bridge penetration losses in extreme coverage scenarios, then coverage reliability is improved, but power consumption increases and scheduling complexity increases
Solution Approach 1:
The system pre-configures RV sequences and repetition parameters before transmission begins. The gNB determines and signals the RV sequence configuration in advance, allowing the UE to prepare for repeated transmissions with known parameters, reducing real-time processing power requirements
Solution Approach 2:
The patent introduces configurable parameters including RV sequence length, repetition number, and RTI duration that can be adjusted based on channel conditions and coverage requirements. This allows optimization of power consumption by transmitting only the necessary number of repetitions with appropriate RV sequences
2Reliability
If multiple repetitions are transmitted across multiple time blocks, then coverage reliability is improved, but transmission latency increases
Solution Approach 1:
The system dynamically determines the repetition time interval (RTI) duration and number of repetitions based on channel conditions and coverage requirements. The gNB can configure different RTI lengths and repetition counts adaptively, allowing the system to minimize latency when possible while ensuring reliable delivery in extreme coverage scenarios
Solution Approach 2:
The repeated transmission is segmented into multiple time blocks with each block containing a configured number of repetitions. This segmentation allows flexible scheduling where transmissions can be completed within one time block when conditions permit, reducing latency, while distributing across multiple blocks when reliability requires more repetitions
3Reliability
If different symbol sequences are transmitted in different repetitions, then decoding reliability is improved, but processing complexity increases
Solution Approach 1:
The patent applies Redundancy Version (RV) sequences that systematically vary transmission parameters across repetitions. Different RV values modify the symbol sequences in a controlled manner that improves decoding reliability while maintaining predictable processing requirements through standardized RV sequence configurations
Solution Approach 2:
The system uses predefined RV sequences that are configured and signaled to both gNB and UE. These sequences provide a standardized copying mechanism where the UE can replicate the same RV sequence pattern used by the gNB, simplifying processing by eliminating the need for complex real-time sequence generation
4Productivity
If RV sequences are preconfigured for repeated transmissions, then scheduling efficiency is improved, but flexibility in adapting to changing channel conditions decreases
Solution Approach 1:
The system provides dynamic configuration of RV sequences through RRC signaling and DCI formats. While RV sequences are preconfigured for efficiency, the gNB can update and reconfigure these sequences adaptively based on changing channel conditions, maintaining both scheduling efficiency and channel adaptation flexibility
Solution Approach 2:
The RV sequence mechanism serves multiple functions: it provides systematic variation for decoding reliability, enables efficient pre-scheduling through configuration, and allows adaptive reconfiguration for changing conditions. The same RV sequence framework handles both initial transmissions and retransmissions across different channel conditions
Data Source
AI summary
Methods and apparatus are provided for repeated transmission. In one novel aspect, the RV sequence is selected from a predefined set of RV sequences for the repeated transmission. In one embodiment, the one or more RV values in the selected RV sequence are repeatedly used for the repeated transmission, by applying each RV value one by one to one block of repetitions cyclically, wherein the number of repetition in the block is determined by the repetition number and the length of the RV sequence. In another embodiment, the one or more RV values in the selected RV sequence are repeatedly used for the repeated transmission, by applying each RV value one by one to one repetition cyclically. In one embodiment, the RV value and the scrambling sequences are the same for the repetition blocks and a symbol level combination is applied.