Cell Reselection Information Delivery via Random Access Procedure
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Solution Overview
Problem
In LTE networks, the periodic broadcasting of system information leads to unnecessary waste of system resources and inefficient use of air interface transmission resources, as user equipment must receive and process extensive system information before performing cell reselection.
Innovation Solution
Implement a method where the first access device sends cell reselection information only upon request from the user equipment during the random access procedure, rather than periodically broadcasting it, and includes this information in response messages or connection setup messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the eNB periodically broadcasts all system messages to the UE, then the UE can obtain complete system information for cell reselection, but system resources are wasted and air interface transmission resources are inefficiently used
Solution Approach 1:
The patent extracts and separates cell reselection information from the periodic system message broadcast. Instead of broadcasting all system information periodically, the base station sends only the necessary cell reselection information to UEs during the random access procedure, specifically in the RACH response or RRC connection setup complete message. This extraction principle resolves the contradiction by providing complete information when needed without continuous broadcast waste.
Solution Approach 2:
The patent implements preliminary action by providing cell reselection information to the UE in advance during the random access procedure, before the UE actually needs to perform cell reselection. The information is included in the RACH response message or RRC connection setup complete message, allowing the UE to have the information ready when needed, eliminating the need for periodic broadcasts.
2Ease of operation
If the eNB periodically broadcasts all system messages, then the UE can access cell reselection information, but transmission overhead increases and resource utilization decreases
Solution Approach 1:
The patent extracts cell reselection information from the periodic system message broadcast and delivers it separately during the random access procedure. This extraction reduces transmission overhead by sending only necessary information through dedicated channels (RACH response or RRC connection setup complete message) rather than broadcasting all system information periodically.
Solution Approach 2:
The patent implements a dynamic information delivery mechanism where cell reselection information is provided on-demand during the random access procedure rather than through static periodic broadcasts. The information is included in RACH response messages or RRC connection setup complete messages, allowing the system to adapt information delivery to actual UE needs and reduce unnecessary transmission overhead.
3Reliability
If all system information is broadcast periodically, then the UE can determine camping conditions, but air interface transmission resources are inefficiently utilized
Solution Approach 1:
The patent extracts cell reselection information from periodic system message broadcasts and delivers it separately during the random access procedure through RACH response or RRC connection setup complete messages. This extraction maintains reliable camping condition determination while significantly improving air interface transmission efficiency by eliminating redundant periodic broadcasts of information that can be provided on-demand.
Data Source
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AI summary
The present invention discloses a system message transmission method, a related device, and a communications system. The method includes: receiving, by a first access device, a random access message sent by user equipment; and sending, by the first access device, first system information to the user equipment based on the random access message, where the first system information includes cell reselection information related to the first access device. According to the present invention, cell reselection information can be transferred in a random access procedure.