RV Sequence Processing for 5G Unlicensed Band Reliability
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Solution Overview
Problem
In 5G mobile communication systems using unlicensed bands, data decoding failures occur due to abnormal transmission of data with RV identity 0 in downlink semi-persistent scheduling (SPS), leading to reliability and timeliness issues in communication.
Innovation Solution
A processing method and device that receive and decode redundancy version (RV) sequences, where RV identities for last N transmission opportunities are 0 or 3, to determine retransmission positions and improve data decoding reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmit end monitors the unlicensed band before sending signals (LBT mechanism), then the band occupancy rules are satisfied, but data transmission may fail when the band is occupied
Solution Approach 1:
The network side pre-configures multiple RV sequences for the terminal before actual data transmission. When LBT fails or transmission is abnormal, the terminal can switch to pre-configured RV sequences without requiring real-time negotiation, enabling rapid recovery and retransmission.
Solution Approach 2:
The patent changes the RV sequence parameters dynamically based on transmission status. Different RV sequences are configured for different transmission scenarios (normal transmission, retransmission after LBT failure, etc.), allowing the system to adapt to varying channel conditions and transmission requirements.
2Reliability
If the terminal continuously monitors and decodes retransmissions, then data decoding reliability improves, but power consumption increases
Solution Approach 1:
The terminal feeds back decoding results to the network side. When decoding succeeds, the terminal can stop monitoring subsequent retransmissions, significantly reducing power consumption. The network side uses this feedback to determine whether to continue retransmission.
Solution Approach 2:
The terminal performs partial monitoring of retransmissions based on configured RV sequences. Instead of monitoring all possible retransmissions, the terminal only monitors those with expected RV identities that match the configured sequences, reducing unnecessary power consumption while maintaining decoding reliability.
3Productivity
If the network side sends data with RV identity 0 in aggregation mode, then transmission efficiency improves, but decoding failure occurs when band is occupied
Solution Approach 1:
Different RV identities are assigned to different transmission opportunities based on local conditions. When the band is occupied or LBT fails, the system switches to RV identities 2 or 3 for retransmission, while maintaining RV identity 0 for normal transmissions where the band is available.
Solution Approach 2:
The RV identity selection is dynamic rather than static. The system can switch between different RV identities (0, 2, 3) based on transmission status, LBT results, and channel conditions, making the transmission process adaptable and resilient to unlicensed band occupancy.
Data Source
AI summary
The embodiments of the present disclosure provide a processing method and device. The method includes: receiving a redundancy version RV sequence, where an RV identity for last N transmission opportunities in the RV sequence is 0 or 3, and N is a positive integer; and decoding a retransmission position according to an RV identity order indicated by the RV sequence.