RACH Preamble Classification for Mobile Communication Delay Reduction
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Solution Overview
Problem
Current RACH procedures in mobile communications systems result in increased delay time and inefficient use of radio resources due to the need for preamble transmission, ACK reception, and message portion transmission, especially when terminals do not have data to transmit.
Innovation Solution
Classifying and grouping RACH signatures and occasions based on specific information such as usage purpose, CQI, and establishment cause to allow terminals to select appropriate signatures and occasions for preamble transmission, thereby reducing delay and optimizing radio resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional RACH procedures are used for information transmission, then reliability of connection establishment is maintained, but delay time increases and radio resources are consumed inefficiently
Solution Approach 1:
The patent segments the RACH procedure into multiple parallel paths: traditional message exchange path and direct data transmission path. Terminals can select the direct path when no data needs to be transmitted, bypassing the lengthy preamble-ACK-message sequence and reducing delay while maintaining connection reliability through selective path usage
Solution Approach 2:
The patent implements preliminary action by having terminals report buffer status information to the base station before initiating RACH procedures. This allows the base station to pre-determine whether data transmission is needed, enabling terminals to skip unnecessary preamble transmission and directly transmit data or remain idle, thereby reducing delay time
2Loss of energy
If traditional RACH procedures are used, then complete information exchange is achieved, but radio resource consumption increases
Solution Approach 1:
The patent extracts the essential function of the RACH procedure (buffer status reporting) from the complete traditional message exchange sequence. By separating the buffer status report from the data transmission process and handling it through efficient direct paths, the patent eliminates unnecessary message exchanges while preserving the critical information exchange function
Solution Approach 2:
The patent creates a universal buffer status report mechanism that serves multiple purposes: it informs the base station about terminal data needs, enables direct data transmission path selection, and replaces multiple traditional message exchanges. This multi-functional approach reduces radio resource consumption while maintaining complete information exchange
Data Source
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AI summary
Transmitting information using a preamble of a Random Access Channel (RACH) in an Evolved Universal mobile Telecommunications System (E-UMTS) is provided. A preamble transmission is used to inform a base station of specific information when a terminal uses a RACH and the base station efficiently allocates radio resources for data transmission to the terminal according to the specific information. Delay time before the terminal transmits data is reduced and unnecessary consumption of radio resources is minimized.