Broadcast Channel Segmentation for Scalable Bandwidth Reception
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Solution Overview
Problem
In cellular wireless communication systems supporting scalable bandwidth, user equipment (UE) with varying reception bandwidths face challenges in successfully receiving system information from neighboring cells, especially when in idle or active modes, due to limitations in current Broadcast Channel (BCH) transmission and reception methods.
Innovation Solution
The method involves mapping BCH modulation symbols into a central band with a bandwidth equal to the UE's reception bandwidth and dividing them into two resource blocks, with additional mapping into one-half bands when the system bandwidth is twice or larger than the UE's reception bandwidth, allowing successful reception and decoding of system information from neighboring cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If BCH is transmitted only in the central band with fixed bandwidth, then UEs can perform cell search without knowing system bandwidth, but UEs with limited reception bandwidth cannot receive system information from neighboring cells operating at higher bandwidths
Solution Approach 1:
The patent segments the BCH transmission into multiple frequency bands: a central band containing essential system information that all UEs can receive, and additional half-bands containing supplementary information for UEs with wider reception bandwidths. This segmentation allows UEs to receive at least the central band regardless of their reception bandwidth capability, ensuring reliable BCH reception while enabling enhanced functionality for capable UEs.
Solution Approach 2:
The patent extends BCH transmission from a single central frequency band to multiple frequency dimensions by adding half-bands on either side of the central band. This dimensional expansion in the frequency domain allows the system to accommodate UEs with different reception bandwidths, as UEs can receive the central band plus available half-bands according to their capabilities.
2Quantity of substance
If BCH transmission bandwidth is increased to cover wider system bandwidths, then more system information can be transmitted, but UEs with smaller reception bandwidths cannot decode the entire BCH
Solution Approach 1:
The patent divides the total BCH information into segments transmitted across different frequency bands: essential system information in the central band and supplementary information in half-bands. UEs with limited reception bandwidth can successfully decode the central band to obtain critical system information, while UEs with wider bandwidths can decode additional half-bands for complete information.
Solution Approach 2:
The patent applies local quality by making different parts of the BCH transmission serve different purposes: the central band contains must-have system information for all UEs, while half-bands contain additional information for UEs that can receive them. This ensures that each UE receives appropriate information quality according to its reception capabilities.
3Adaptability or versatility
If BCH is transmitted in multiple bands to support scalable bandwidth, then UEs can receive information matching their bandwidth, but the complexity of BCH mapping and reception increases
Solution Approach 1:
The patent simplifies the mapping complexity by segmenting BCH transmission into a standardized central band structure with optional half-bands. The central band follows a fixed mapping pattern that all UEs can process, while half-bands are added in a predictable manner. This segmentation reduces the overall complexity compared to completely flexible bandwidth adaptation.
Solution Approach 2:
The patent creates a universal BCH transmission framework where the central band serves all UEs regardless of their reception bandwidth, while half-bands provide enhanced functionality for capable UEs. This multi-functional approach allows the same transmission structure to serve both basic and advanced reception requirements without requiring separate systems.
Data Source
AI summary
Provided is a method and an apparatus for transmitting/receiving a Broadcast Channel (BCH), by which a User Equipment (UE) can successfully receive system information of neighboring cells in a system supporting the scalability of a UE reception bandwidth and a system bandwidth. The method includes identifying a system bandwidth of a cell by comparing the system bandwidth with reception bandwidths of UEs within the cell, mapping two BCH information blocks including system information to a central band having a bandwidth equal to a transmission bandwidth of the BCH, additionally mapping at least one of the information blocks into each of one-half bands of the system bands, when the system bandwidth is two times an amount of the reception bandwidth, and transmitting a frequency domain signal, to which the information blocks are mapped, to the UEs located within the cell.