Random Access Preamble and Uplink Data Merging
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Solution Overview
Problem
The 4-step random access procedure in wireless communications systems, particularly in 5th generation systems, experiences high latency, which negatively impacts user experience and data transmission efficiency.
Innovation Solution
A method is introduced where the terminal side device determines a random access resource and an uplink data resource, allowing for simultaneous or subsequent transmission of a random access preamble and uplink data using non-scheduling grant resources, with timers and feedback mechanisms to manage data transmission and error handling, thereby reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a 4-step random access procedure is used to establish connection between terminal and network, then connection reliability is improved, but transmission latency increases
Solution Approach 1:
The patent combines the random access preamble transmission and uplink data transmission into a single step (Message A), merging what were previously separate operations (Message 1 and Message 3 in 4-step RACH) into one concurrent transmission, thereby reducing the number of round-trip delays while maintaining connection reliability
Solution Approach 2:
The terminal performs preliminary actions by simultaneously preparing and transmitting both the random access preamble and uplink data in Message A, along with pre-configuring uplink resources based on network configuration, which reduces waiting time and accelerates the connection establishment process
2Reliability
If separate transmission of random access preamble and uplink data is performed, then transmission reliability is improved, but transmission efficiency decreases
Solution Approach 1:
The patent merges random access preamble transmission and uplink data transmission into a single Message A transmission, allowing both operations to occur simultaneously in one uplink slot, which improves transmission efficiency while the network separately acknowledges each component to maintain reliability
Solution Approach 2:
The network provides separate feedback mechanisms: Random Access Response (RAR) for preamble acknowledgment and individual HARQ acknowledgments for uplink data, ensuring reliable transmission confirmation for each component while enabling efficient simultaneous transmission
Data Source
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AI summary
Embodiments of this application provide a random access processing method. A random access preamble and uplink data are sent in an initiation phase of a random access procedure, and the random access procedure is ended in time after feedback information for the uplink data is received. According to technical solutions provided in the embodiments of this application, a terminal side device may send the uplink data when sending the random access preamble in the random access procedure. This can reduce a transmission latency of the uplink data. In addition, the random access procedure can be ended in advance after the feedback information for the uplink data is received, and therefore the transmission latency of the uplink data is further reduced.