Downlink Bandwidth Positioning via PBCH Signaling in 5G UE Reception
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently configuring and receiving downlink channels due to uncertainties in bandwidth positioning, particularly in future-generation 5G systems with diverse communication scenarios, such as eMBB, URLLC, and mMTC, where precise bandwidth alignment is necessary for optimal data transmission.
Innovation Solution
A method and apparatus for a user equipment (UE) to receive a downlink channel by obtaining information about the downlink bandwidth from a synchronization signal block (SSB), including a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH), and configuring the reception within a determined downlink bandwidth based on this information, with offsets defined in resource blocks (RBs) and subcarrier spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE receives SSB and attempts to determine downlink bandwidth automatically, then the system can adapt to different bandwidth configurations, but the processing time and complexity increase due to multiple blind detections and searches
Solution Approach 1:
The network pre-configures and signals the downlink bandwidth information through PBCH (Physical Broadcast Channel) before the UE needs to receive downlink channels. This preliminary provision of bandwidth information eliminates the need for time-consuming blind detections and searches, allowing the UE to directly configure its receiver for the correct bandwidth without iterative testing.
2Ease of operation
If the UE performs blind detection to determine downlink bandwidth, then it can discover the correct bandwidth without prior signaling, but the reliability and speed of channel reception deteriorate due to multiple search operations
Solution Approach 1:
The network provides explicit feedback about the downlink bandwidth configuration through PBCH signaling. This feedback mechanism replaces unreliable blind detection with confirmed, signaled information, ensuring the UE receives accurate bandwidth parameters directly from the network without guessing or iterative verification.
3Adaptability or versatility
If the UE searches for downlink channels across multiple bandwidths, then it can handle unknown bandwidth configurations, but the reception speed and efficiency decrease due to multiple search operations
Solution Approach 1:
The network performs preliminary action by signaling the downlink bandwidth information through PBCH before the UE needs to receive downlink channels. This eliminates the need for time-consuming blind detections and searches, allowing the UE to directly configure its receiver for the correct bandwidth without iterative testing.
4Device complexity
If the network does not signal downlink bandwidth information, then the system structure remains simpler, but the UE must perform complex blind detections and searches to determine the correct bandwidth
Solution Approach 1:
PBCH acts as an intermediary channel that carries downlink bandwidth information from the network to the UE. This intermediary mechanism simplifies the UE's processing by providing direct bandwidth information without requiring complex blind detection algorithms, while adding minimal overhead to the network structure.
Data Source
Figure 1(A)~1(B)
Figure 2
Figure 3(a)~3(b)
AI summary
The present disclosure discloses a method of receiving a downlink channel by a user equipment (UE) in a wireless communication system. Particularly, the method includes receiving a synchronization signal block (SSB) including a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH), obtaining information about the position of a downlink bandwidth from the PBCH, and receiving the downlink channel within the downlink bandwidth determined on the basis of the obtained information about the position of the downlink bandwidth. The information about the position of the downlink bandwidth is an offset from the position of a bandwidth of the SSB to the position of the downlink bandwidth.