Autonomous BWP Switching After Data Burst
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Solution Overview
Problem
In wireless communication networks, particularly in 5G NR systems, there is a delay in switching from a wideband BWP to a narrowband BWP due to unpredictable listen-before-talk (LBT) procedures, which impacts power savings and efficiency, especially in congested shared spectrum environments.
Innovation Solution
Incorporating BWP switching information within data bursts or scheduling grants, allowing the UE to autonomously switch to a narrowband BWP after receiving the last data burst, thereby reducing dependency on LBT delays and enabling quicker power savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE waits for LBT procedure completion before switching BWP, then channel access is ensured, but switching delay increases
Solution Approach 1:
The network configures the UE with BWP switching information in advance within downlink data bursts or scheduling grants. The UE can autonomously execute the BWP switch after receiving the last data burst without waiting for LBT completion or additional network commands, thus reducing switching delay while ensuring reliable channel access through pre-configured instructions
Solution Approach 2:
The UE is empowered to autonomously perform BWP switching based on pre-received switching information and autonomous determination logic. The UE independently decides when to switch BWP after receiving the last data burst, eliminating dependency on network-controlled timing and LBT procedure completion, thereby reducing switching delay
2Reliability
If the UE monitors wideband BWP continuously, then communication reliability is maintained, but power consumption increases
Solution Approach 1:
The network provides BWP switching information in advance within downlink data bursts or scheduling grants. The UE is configured to switch to a narrower BWP after receiving the last data burst, reducing the bandwidth it needs to monitor and thus lowering power consumption while maintaining communication reliability during the active data transmission period
Solution Approach 2:
The UE dynamically adjusts its monitoring bandwidth by switching from a wideband BWP during active data transmission to a narrower BWP after receiving the last data burst. This dynamic adaptation allows the UE to maintain communication reliability when needed while reducing power consumption during idle periods by monitoring a smaller frequency range
3Speed
If the UE switches BWP autonomously after last data burst, then switching speed increases, but coordination complexity increases
Solution Approach 1:
The network pre-configures BWP switching information including target BWP identification and switching timing within downlink data bursts or scheduling grants before the UE needs to switch. This preliminary configuration enables the UE to autonomously execute the switch at the appropriate time without real-time network coordination, increasing switching speed while managing complexity through advance planning
Solution Approach 2:
The system uses downlink assignment index (DAI) values and timing indicators in the scheduling grants as feedback mechanisms to inform the UE when to switch BWP. The UE monitors these indicators and autonomously triggers the switch based on predefined conditions, enabling fast autonomous switching while maintaining network coordination through structured feedback signals
Data Source
AI summary
Wireless communications systems and methods related to bandwidth part (BWP) switching after data communication are provided. A user equipment (UE) receives, from a base station (BS) in a first bandwidth part (BWP), one or more data bursts and BWP switching information. The UE switches from the first BWP to a second BWP based on the BWP switching information after receiving the one or more data bursts. The UE communicates, with the BS, a communication in the second BWP after the switching.