LTE Random Access Preamble Group C for Combined Message Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE wireless communication systems, the procedural delay is caused by the stepwise transmission of RRC Connection REQ and NAS Service REQ messages during the random access procedure, leading to inefficiencies in channel establishment and resource allocation.
Innovation Solution
The introduction of a TTI bundling technique allows for simultaneous transmission of RRC Connection REQ and NAS Service REQ messages using a new preamble group C, with system information broadcasting the preamble ID range and channel offset for selecting the preamble group C, enabling efficient resource allocation even in poor channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If RRC Connection REQ and NAS Service REQ messages are transmitted stepwise in conventional LTE random access procedure, then the transmission can be completed with existing message structure, but the procedural delay increases
Solution Approach 1:
The patent merges RRC Connection REQ message and NAS Service REQ message into a single combined message that is transmitted simultaneously in one uplink transmission opportunity following random access preamble, eliminating the sequential transmission steps and reducing procedural delay while maintaining manageable message structure through standardized combining
2Productivity
If new preamble group C is introduced for simultaneous message transmission, then the random access procedure efficiency is improved, but the system information complexity increases
Solution Approach 1:
The patent segments the random access preamble space into distinct groups (Group A, Group B, and new Group C), where each group serves specific purposes. Group C is specifically allocated for simultaneous RRC Connection REQ and NAS Service REQ transmission, allowing efficient identification and handling of combined messages without overwhelming system complexity through structured organization
Data Source
AI summary
An RACH information transmission method and apparatus is provided for a wireless communication system. A preamble selected from a specific preamble group is transmitted. A random access response message having a Transmission Time Interval (TTI) bundling indicator is awaited in response to the preamble. A combined message generated by applying a TTI bundling based on the TTI bundling indicator with a number of TTIs is transmitted, when the random access response message is received.