Msg4 Repetition Control for Reliable NR NTN Contention Resolution
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Solution Overview
Problem
In wireless communication networks, particularly in systems with large coverage requirements like new radio (NR) non-terrestrial networks (NTN), effective enhancements are needed for Message 4 (Msg4) transmission to ensure reliable UE contention resolution.
Innovation Solution
Configuring repetition factors for Msg4 through system information blocks (SIB) and downlink control information (DCI) to determine the number of repetitions for Msg4 transmission and Hybrid Automatic Repeat Request (HARQ) acknowledgments, allowing dynamic adjustment based on network configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Msg4 transmission without repetition is used, then device complexity is reduced, but reliability deteriorates in large coverage scenarios
Solution Approach 1:
The patent implements dynamic Msg4 repetition by allowing the network to configure repetition factors through SIB and DCI messages. The UE determines the number of repetitions based on these configurations, enabling adaptive repetition transmission that adjusts to different coverage scenarios without requiring complex fixed repetition mechanisms.
Solution Approach 2:
The patent changes the transmission parameter of Msg4 by introducing a repetition factor that can be configured through SIB and DCI. This parameter change allows the same Msg4 message to be transmitted multiple times with different repetition counts based on coverage requirements, improving reliability without permanently increasing system complexity.
2Productivity
If Msg4 repetition is configured through SIB and DCI, then transmission effectiveness is improved, but information processing overhead increases
Solution Approach 1:
The patent makes existing SIB and DCI structures multi-functional by adding Msg4 repetition configuration capabilities to them. These existing information blocks already carry scheduling and system information, and the patent extends their functionality to include repetition factor configuration, avoiding the need for separate dedicated signaling messages and reducing overall information overhead.
3Adaptability or versatility
If fixed repetition mechanism is implemented, then implementation simplicity is maintained, but adaptability to different coverage scenarios deteriorates
Solution Approach 1:
The patent implements dynamic Msg4 repetition by allowing the network to configure repetition factors through SIB and DCI messages. The UE determines the number of repetitions based on these configurations, enabling adaptive repetition transmission that adjusts to different coverage scenarios without requiring complex fixed repetition mechanisms.
Data Source
AI summary
Various solutions for Message 4 (Msg4) transmission with respect to user equipment and network node in mobile communications are described. An apparatus may determine whether at least one repetition factor for Msg4 is configured in a system information block (SIB) from a network node. The apparatus may determine whether an indication for Msg4 repetition is configured in a downlink control information (DCI) from the network node. The apparatus may determine a number of repetitions for Msg4 based on at least one of the SIB and the DCI. The apparatus may receive one or more Msg4s from the network node according to the number of repetitions. The apparatus may transmit one or more Msg4 Hybrid Automatic Repeat Request (HARQ)-acknowledgements (ACKs) to the network node according to the number of repetitions.