Bandwidth Part Switching for System Information Acquisition
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing system information acquisition across different bandwidth parts (BWPs), particularly in 5G networks, where UEs may not know which BWP to monitor for updated system information, leading to delays in SI acquisition and potential issues with public warning system notifications.
Innovation Solution
The proposed solution involves a method where a base station transmits a command to a UE to switch to a second DL BWP for acquiring updated system information, and the UE sends an indication upon completion, allowing the network to refrain from transmitting other data until SI acquisition is confirmed, and then switch back to the active BWP for further data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors multiple BWPs for system information updates, then the reliability of SI acquisition is improved, but the device complexity and power consumption increase
Solution Approach 1:
The system bandwidth is segmented into multiple bandwidth parts (BWPs), where a first BWP is dedicated to data transmission and a second BWP is dedicated to system information transmission. This segmentation allows the UE to monitor different BWPs for different purposes, improving SI acquisition reliability without requiring the UE to monitor the entire system bandwidth continuously.
Solution Approach 2:
A BWP switch indication is introduced as an intermediary mechanism. The network sends this indication to trigger the UE to switch from the first BWP to the second BWP for system information acquisition. This intermediary allows coordinated switching between BWPs, ensuring reliable SI acquisition while managing UE complexity through controlled transitions rather than continuous monitoring of all BWPs.
2Productivity
If the UE switches to a different BWP for SI acquisition, then the SI acquisition efficiency is improved, but the loss of time for BWP switching occurs
Solution Approach 1:
The UE is pre-configured with multiple BWPs and their respective parameters before needing to acquire system information. When a BWP switch indication is received, the UE can quickly switch to the pre-configured second BWP without extensive setup time, improving SI acquisition efficiency while minimizing switching time loss.
Solution Approach 2:
The system implements dynamic BWP switching where the UE can flexibly transition between the first BWP (for data) and the second BWP (for SI) based on network indications and acquisition needs. This dynamic approach allows the UE to optimize its operation by being on the appropriate BWP at the right time, balancing switching overhead against acquisition efficiency.
3Ease of operation
If the network transmits SI on the active BWP, then the ease of operation is improved, but the loss of information occurs when UE is not monitoring that BWP
Solution Approach 1:
A paging message serves as an intermediary notification mechanism. Instead of relying solely on direct SI transmission on the active BWP, the network uses paging messages to notify UEs of SI updates. The UE monitors paging messages on the active BWP, and when an SI update is indicated, the UE switches to the second BWP to acquire the actual SI. This two-stage approach ensures UEs don't miss update notifications while maintaining transmission simplicity.
Solution Approach 2:
The information transmission is segmented into two parts: update notifications sent on the active first BWP via paging messages, and actual SI content sent on the second BWP. This segmentation allows the notification mechanism to operate on the simple active BWP while the detailed SI acquisition occurs on a dedicated second BWP, preventing information loss without complicating the primary data transmission path.
Data Source
AI summary
Certain aspects of the present disclosure relate to communication systems, and more particularly, to system information acquisition over bandwidth parts (BWPs) in communications system operating according to new radio (NR) technologies. In an exemplary method, a user equipment (UE) receives system information (SI) via a transmission in a downlink (DL) bandwidth part (BWP) of a system bandwidth and transmits, to a serving base station (BS) and in response to receiving the SI, an indication that the UE has completed SI acquisition.