2-Step Random Access with Parallel MsgA for Low-Latency Reliability
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Solution Overview
Problem
The challenge in wireless communication systems is to efficiently manage the increased number of user equipments and data transmission with limited resources, particularly addressing latency and delay in applications that depend critically on delay/latency.
Innovation Solution
A method for performing a 2-step Random Access (RA) procedure involving generating and transmitting data units with RA preambles, monitoring windows for MsgB messages, and stopping windows upon successful reception of specific acknowledgement messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple MsgA transmissions are performed with different preambles, then the reliability of data transmission is improved, but the time required for random access procedure increases
Solution Approach 1:
The UE transmits multiple MsgA with different preambles in advance before knowing whether the data transmission will be successful. This preliminary action ensures that if the first transmission fails, the network already has alternative preambles to respond with, reducing the overall access time while maintaining high reliability
Solution Approach 2:
The random access procedure is segmented into multiple parallel MsgA transmission attempts, each with its own monitoring window. This allows the UE to divide the transmission task into independent segments that can be processed concurrently, improving reliability without proportionally increasing total time
2Reliability
If multiple monitoring windows are maintained for multiple MsgA, then the reliability of receiving acknowledgement is improved, but the device complexity increases
Solution Approach 1:
The monitoring windows are dynamically managed with start and end times. When a successRAR is detected in any window, all other monitoring windows are immediately stopped. This dynamic adjustment reduces the actual operational complexity while maintaining the reliability benefits of multiple monitoring opportunities
Solution Approach 2:
All monitoring windows are pre-configured with their time parameters before the random access procedure begins. This preliminary configuration simplifies the runtime complexity by eliminating the need for dynamic window creation and management decisions during the actual access procedure
Data Source
AI summary
The present invention relates to a method of performing a Random Access (RA) procedure by a user equipment (UE) in a wireless communication system. Especially, the method includes the steps of generating a data unit; transmitting a first MsgA and a second MsgA to a network, wherein the first MsgA includes a first RA preamble and the data unit, and wherein the second MsgA includes a second RA preamble and the data unit; starting a first window for monitoring a first MsgB for the first MsgA and a second window for monitoring a second MsgB for the second MsgA; and monitoring the first MsgB until the first window expires and a second MsgB until the second window expires, wherein, when one of the first MsgB and the second MsgB is detected and when the detected MsgB includes successRAR, both the first and second windows are stopped.