Self-Decodable PBCH Portion for Narrowband UE Synchronization
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Solution Overview
Problem
In wireless communication systems, particularly in mmWave frequencies, signal attenuation and path losses pose challenges for user equipment (UEs) to receive and decode physical broadcast channels (PBCH) over the entire bandwidth, as they may only be capable of receiving within a narrow band, limiting their ability to acquire network synchronization and system information efficiently.
Innovation Solution
The technique involves transmitting a PBCH with a self-decodable portion within the bandwidth of a synchronization signal block, allowing UEs to decode the PBCH without receiving the entire PBCH bandwidth, by using polar encoding, interleaving, and tone mapping, enabling efficient decoding even with limited receive bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs receive the entire PBCH bandwidth to decode system information, then complete system information is acquired, but power consumption increases and narrowband UEs cannot receive it
Solution Approach 1:
The PBCH is segmented into a self-decodable portion and an outside portion. The self-decodable portion contains essential system information that can be decoded independently within a narrow bandwidth, while the outside portion contains additional information requiring wider bandwidth. This segmentation allows narrowband UEs to acquire critical system information by receiving only the self-decodable portion, significantly reducing power consumption while maintaining reliable system information acquisition.
2Use of energy by moving object
If UEs with narrow receive bandwidth are used, then power consumption is reduced, but the ability to decode PBCH is limited
Solution Approach 1:
The PBCH message is divided such that the self-decodable portion fits within narrow bandwidth constraints while containing sufficient system information for basic network access. This ensures that narrowband UEs can successfully decode the essential portion without requiring wide bandwidth, maintaining both power efficiency and decoding reliability.
Solution Approach 2:
The encoding parameters of the self-decodable portion are optimized for narrowband transmission. By adjusting modulation and coding parameters specifically for the self-decodable portion, the system ensures reliable decoding capability within limited bandwidth while allowing the outside portion to use wider bandwidth parameters for enhanced information transmission.
3Loss of information
If the PBCH is transmitted over the entire bandwidth, then complete information is available, but narrowband UEs cannot acquire synchronization efficiently
Solution Approach 1:
The self-decodable portion is designed to contain critical synchronization and system information that enables narrowband UEs to quickly acquire network access without waiting for the complete PBCH transmission. This segmentation allows these UEs to efficiently acquire synchronization and basic system information in a timely manner, reducing acquisition time while the base station continues to transmit the complete information set for wideband UEs.
Data Source
AI summary
Techniques for wireless communication are described. A method of wireless communication at a user equipment (UE) includes receiving a synchronization signal within a synchronization signal (SS) block; receiving at least a portion of a physical broadcast channel (PBCH) of the SS block, the PBCH comprising a self-decodable portion and an outside portion; and decoding the PBCH based at least in part on receiving the self-decodable portion of the PBCH. The synchronization signal has a first bandwidth. The self-decodable portion of the PBCH has a second bandwidth substantially within the first bandwidth. The outside portion having a bandwidth that is outside of the second bandwidth and within a PBCH bandwidth, the PBCH bandwidth being greater than the first bandwidth.