Base Station System Information Segmentation for Cell Search
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Solution Overview
Problem
In W-CDMA, the transmission of various system information on a single broadcast channel leads to increased broadcast channel information size and time required for cell search, resulting in prolonged power consumption and communication quality degradation, especially during handovers and when the mobile station is outside the coverage area.
Innovation Solution
A base station generates and transmits system information using multiple channels or blocks, categorizing it into primary and secondary broadcast channels, where only essential information is sent on the primary channel for fast cell search, reducing the overall information received by the mobile station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If all system information is transmitted on a single broadcast channel, then complete system information is provided to mobile stations, but the broadcast channel information size increases and cell search time is prolonged
Solution Approach 1:
The patent segments system information into multiple categories (sector-specific, base station-specific, upper node-specific, location registration area-specific, and system-specific information) and transmits them on separate broadcast channels or blocks. This allows mobile stations to receive only the necessary information for cell search on the primary channel while complete information is available on secondary channels, thus reducing cell search time without losing information completeness.
Solution Approach 2:
The patent extracts essential cell search information from the complete system information and places it on the primary broadcast channel. This extraction allows mobile stations to perform cell search quickly using only the critical information needed, while the remaining system information is transmitted on secondary channels for stations that require it.
2Loss of information
If mobile station receives complete broadcast channel information, then all system information is obtained, but power consumption increases
Solution Approach 1:
By segmenting system information into multiple categories and transmitting them on separate channels, mobile stations can selectively receive only the information they need (e.g., sector-specific information when changing sectors) rather than receiving all system information, thereby reducing power consumption while maintaining information completeness when needed.
Solution Approach 2:
The patent applies local quality by providing different information sets to different mobile stations based on their specific needs and locations. Mobile stations at sector boundaries receive sector-specific information from relevant sectors, while other stations receive only the minimum necessary information, optimizing power consumption for each station's specific operational context.
3Loss of information
If system information is transmitted on a single broadcast channel, then all information is available, but interference increases when mobile station is at sector boundary
Solution Approach 1:
The patent segments system information into sector-specific, base station-specific, and other categories transmitted on separate channels. When a mobile station is at a sector boundary, it can selectively receive sector-specific information from the relevant sector without receiving redundant or interfering base station-specific information from other sectors, thereby reducing interference while maintaining information availability.
Data Source
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AI summary
The present invention relates to a base station for generating and transmitting system information to a mobile station. The present invention also relates to a communication method of communicating system information in a communication system including the base station and the mobile station. The base station generates system information; categorizes the system information into multiple pieces of system information; multiplexes the categorized multiple pieces of system information into multiple channels or multiple blocks; and transmits the system information on the multiple channels or the multiple blocks. The mobile station receives system information included in a portion of the multiple channels or the multiple blocks.