2-Step Random Access MsgA Signal Design for Collision Reduction
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Solution Overview
Problem
In LTE and 5G NR communication systems, the existing random access procedure is inefficient, leading to high bit rates and increased collision probabilities of preambles or reference signals among communication devices.
Innovation Solution
A 2-step random access procedure is proposed, where a communication device determines a second signal based on N bits of first information, which includes a preamble or reference signal, and sends this signal in MsgA. This approach reduces the bit rate and improves transmission reliability by incorporating part of the first information into the second signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional 4-step random access procedure is used, then the UE can obtain uplink synchronization and establish connection with the cell, but the bit rate is high and the collision probability of preambles or reference signals is increased
Solution Approach 1:
The patent merges the preamble and reference signal into a single composite signal structure. The reference signal is embedded within the preamble sequence, allowing the gNodeB to extract both timing synchronization information and device identification information from the same transmitted signal, thereby reducing the total bit rate while maintaining transmission reliability
Solution Approach 2:
The preamble sequence serves multiple functions simultaneously: it provides timing synchronization, device identification, and reference signal functionality. This multi-functional design eliminates the need for separate reference signal transmissions, reducing overall bit rate while improving transmission efficiency and reliability
2Ease of operation
If multiple UEs select randomly a sequence from a candidate sequence pool to initiate random access, then the UE can initiate random access without dedicated configuration, but the collision probability of preambles is increased
Solution Approach 1:
The patent applies different local qualities to different parts of the preamble structure. Specific segments of the preamble sequence are designed with unique properties that allow individual UE identification, while other segments provide synchronization functionality. This localized differentiation reduces collision probability while maintaining ease of random access initiation
Solution Approach 2:
The patent changes the parameters of the preamble sequence by embedding device-specific reference signal patterns within the preamble. This parameter modification allows the system to distinguish between multiple UEs using random access, reducing collision probability while maintaining the randomness and ease of initiation
3Measurement precision
If the UE sends preamble and reference signal separately, then the gNodeB can perform accurate timing estimation and channel estimation, but the bit rate and signaling overhead are increased
Solution Approach 1:
The patent combines timing estimation and channel estimation functions into a single preamble transmission. The embedded reference signal within the preamble allows the gNodeB to perform both timing synchronization and channel estimation from the same signal, eliminating redundant transmissions and reducing signaling overhead while maintaining measurement precision
Solution Approach 2:
The preamble is segmented into functional regions: synchronization sequences for timing estimation and embedded reference signal sequences for channel estimation. This segmentation allows the gNodeB to extract different types of information from different parts of the same transmitted signal, maintaining accuracy while reducing overall overhead
Data Source
AI summary
Provided are an information transmission method and apparatus, a communication device, a communication node and a computer-readable storage medium. The method includes that: a communication device determines a second signal according to N bits in first information, wherein the second signal includes at least one of a preamble and a Reference Signal (RS), and N is an integer greater than or equal to 1; and the communication device sends a message A including the second signal.