Time-Domain BWP Switching Using Padded Transport Blocks
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Solution Overview
Problem
Existing UE power management mechanisms in TD-BWP systems often result in increased latency due to prolonged operation in low-data activity bandwidth parts, leading to inefficient battery usage and retransmissions.
Innovation Solution
Implementing mechanisms for TD-BWP switching based on UE-triggered padded transport blocks, block error rate, and traffic type, or network-triggered switching based on additional measurements, to dynamically adjust between high and low data activity bandwidth parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE operates in BWP #2 (sparse PDCCH monitoring) to save battery power, then energy consumption is reduced, but transmission latency increases due to delays and retransmissions
Solution Approach 1:
The system dynamically switches between two TD-BWP configurations based on real-time traffic conditions. The first TD-BWP is configured for low data traffic with sparse PDCCH monitoring to save power, while the second TD-BWP is configured for high data traffic with dense PDCCH monitoring to reduce latency. The network receives indication information from the UE about traffic conditions and triggers appropriate BWP switching, making the system adaptive rather than static.
Solution Approach 2:
The patent changes key transmission parameters when switching between TD-BWP configurations. The first TD-BWP uses sparse PDCCH monitoring occasions and specific subcarrier spacing to reduce power consumption during low traffic. The second TD-BWP uses dense PDCCH monitoring occasions and different subcarrier spacing to reduce latency during high traffic. These parameter changes allow the system to optimize performance for different traffic scenarios.
2Duration of action of stationary object
If the UE stays in BWP #2 for extended periods to conserve energy, then battery life is extended, but data transmission efficiency deteriorates due to increased retransmissions
Solution Approach 1:
The system implements a feedback mechanism where the UE monitors its own traffic conditions and sends indication information to the network about whether traffic is high or low. Based on this feedback, the network triggers appropriate TD-BWP switching. This closed-loop feedback ensures that the UE switches to the high-performance BWP when traffic increases, preventing efficiency degradation while maintaining energy savings during low traffic periods.
Solution Approach 2:
The network pre-configures two distinct TD-BWP configurations with different PDCCH monitoring densities and subcarrier spacing settings. These configurations are prepared in advance, so when traffic conditions change, the UE can quickly switch to the appropriate pre-configured BWP without needing to reconfigure parameters in real-time, enabling rapid response to traffic changes.
3Speed
If the UE uses dense PDCCH monitoring (BWP #1) continuously, then transmission latency is reduced, but power consumption increases
Solution Approach 1:
The patent segments the transmission time into different TD-BWP configurations based on traffic needs. Instead of using dense PDCCH monitoring continuously, the system divides operation into periods using the first TD-BWP (sparse monitoring) for low traffic and the second TD-BWP (dense monitoring) for high traffic. This temporal segmentation allows the system to achieve high transmission speeds only when necessary, reducing overall power consumption.
Data Source
AI summary
Some aspects of this disclosure relate to apparatuses and methods for implementing time domain bandwidth part (TD-BWP) switch for balancing between the UE power consumption and a latency of the UE. For example, a UE can be configured to add a plurality of padding bits to a transport block (TB) to reach a predetermined slot capacity for one transmission time interval (TTI) associated with UE traffic in response to determining that a parameter associated with the UE traffic meets a condition. The UE can be further configured to transmit the TB over the TTI to the base station and receive a message from the base station. The UE is further configured to change a time domain bandwidth part (TD-BWP) based on the received message.