Paging Indicator Segmentation for Bandwidth-Constrained UEs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In bandwidth-scalable cellular wireless communication systems, UEs with less bandwidth than the system bandwidth face challenges in reliably receiving Paging Channel (PCH) signals, leading to increased overhead and complexity.
Innovation Solution
The PCH signal is divided into a Paging Indicator (PI) and a paging message, mapped to different frequency areas, with PIs transmitted redundantly in multiple bands and paging messages transmitted only in a predetermined band, minimizing overhead and reducing receiver complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PCH signal is transmitted across the total system band, then system bandwidth utilization is improved, but UEs with less bandwidth cannot receive the signal reliably
Solution Approach 1:
The PCH signal is segmented into two parts: Paging Indicators (PIs) transmitted in multiple frequency bands (including both 10MHz bands) and paging messages transmitted only in a predetermined band. This segmentation allows UEs with 10MHz bandwidth to reliably receive PIs in their supported band while the system utilizes the full 20MHz band for transmission.
2Reliability
If PCH signal is transmitted redundantly in multiple bands, then reception reliability for bandwidth-constrained UEs is improved, but transmission overhead increases
Solution Approach 1:
The PCH signal is divided into PIs and paging messages with different transmission strategies. PIs are transmitted redundantly in multiple bands to ensure reliability, while paging messages are transmitted only once in a predetermined band, reducing overall overhead compared to transmitting the entire PCH signal redundantly.
Solution Approach 2:
Different parts of the PCH signal have different transmission qualities: PIs are transmitted with higher redundancy (in both bands) to ensure reliable detection, while paging messages are transmitted with lower redundancy (only in predetermined band) to reduce overhead. This local differentiation optimizes the trade-off between reliability and overhead.
3Adaptability or versatility
If PCH signal is transmitted across different 10MHz bands, then bandwidth-scalable support is improved, but receiver complexity increases
Solution Approach 1:
The PCH signal structure is segmented into PIs and paging messages transmitted in different bands. UEs with 10MHz bandwidth only need to monitor their supported band for PIs, reducing receiver complexity compared to monitoring the entire 20MHz band. The system maintains bandwidth-scalable support by allowing UEs to operate in their capability-matched bands.
4Reliability
If paging messages are transmitted in multiple bands, then reception reliability is improved, but transmission overhead increases
Solution Approach 1:
The PCH signal is segmented into PIs and paging messages with different transmission strategies. PIs are transmitted in multiple bands for reliability, while paging messages are transmitted only in a predetermined band, avoiding the overhead of transmitting the entire paging message redundantly across multiple bands.
Solution Approach 2:
PIs are transmitted preliminarily in multiple bands to indicate the presence and scheduling of paging messages. This preliminary action allows UEs to identify relevant paging messages before attempting to receive them, reducing the need for redundant paging message transmissions across multiple bands.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method and apparatus for transmitting/receiving paging information in a wireless communication system having a system bandwidth being an integer multiple of a minimum reception bandwidth of a User Equipment (UE), in which a system band is divided into frequency bands having a bandwidth equal to the minimum reception bandwidth of the UE, a Paging Indicator (PI) of the paging information is transmitted in each of the frequency bands, the PI including a group identifier (ID) of a group to which the UE belongs, and a paging message of the paging information is transmitted in one of the frequency bands, the paging message including an ID of the UE.