CE Random Access Signaling for Adaptive PRACH and PUSCH Repetitions
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Solution Overview
Problem
The existing 5G NR RAN systems face challenges in efficiently managing random access procedures, particularly in scenarios with coverage enhancement (CE), leading to inefficiencies in PRACH, PUSCH, and MsgA PUSCH transmissions, which can result in failed synchronization and data transfer issues.
Innovation Solution
A method and apparatus for a UE to determine and perform a number of PRACH, PUSCH, and MsgA PUSCH transmissions based on received parameters, including thresholds, RSRP, and resource configurations, allowing for optimized random access procedures in CE scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of PRACH transmissions is increased to improve coverage enhancement, then the reliability of random access is improved, but the loss of time and system resource overhead increases
Solution Approach 1:
The patent implements dynamic determination of the number of PRACH transmissions based on real-time channel conditions and coverage enhancement levels. The UE adapts the transmission count according to measured RSRP values and network configuration, allowing the system to optimize between reliability and time loss by transmitting more times only when necessary for coverage enhancement
Solution Approach 2:
The patent changes the parameter of transmission count from a fixed value to a dynamically adjustable parameter based on coverage enhancement requirements. By modifying this parameter according to channel conditions and CE levels, the system achieves improved reliability when needed while avoiding unnecessary time loss in good coverage conditions
2Reliability
If the number of PUSCH transmissions is increased to improve data transfer reliability, then the reliability of data transfer is improved, but the use of energy and system resources increases
Solution Approach 1:
The patent dynamically adjusts the number of PUSCH transmissions based on uplink channel conditions, UE power headroom, and network configuration. The UE monitors channel quality and adapts the transmission count accordingly, ensuring reliable data transfer when channel conditions are poor while conserving energy when conditions are good
Solution Approach 2:
The patent modifies the transmission count parameter for PUSCH based on coverage enhancement level and channel conditions. By changing this parameter dynamically, the system achieves improved data transfer reliability in challenging conditions while avoiding excessive energy consumption in normal conditions
3Adaptability or versatility
If more parameters are configured for RA procedures to optimize transmissions, then the adaptability of the system is improved, but the device complexity increases
Solution Approach 1:
The patent segments the RA procedure parameters into different groups based on their function and configuration level. By organizing parameters into manageable segments (e.g., coverage enhancement parameters, resource allocation parameters, power control parameters), the UE can process and manage them more efficiently, reducing the perceived complexity while maintaining full adaptability
Solution Approach 2:
The patent implements preliminary configuration of RA parameters through network signaling before the actual random access procedure. By pre-configuring parameters such as maximum transmission counts, RSRP thresholds, and resource allocations, the UE's real-time decision-making complexity is reduced as it only needs to select from pre-determined options based on current channel conditions
Data Source
AI summary
The present disclosure is related to a UE, a network node, and methods for CE RA signaling and configuring. A method at a UE for performing an RA procedure comprises: receiving, from a network node, one or more parameters; and determining, based on at least the one or more parameters, at least one of: a first number of PRACH transmissions; a second number of PUSCH transmissions scheduled by a RAR associated with the RA procedure; and a third number of MsgA PUSCH transmissions.