TD-BWP Switching for UE Power and Latency Balance
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Solution Overview
Problem
Current time domain bandwidth part (TD-BWP) switching mechanisms in user equipment (UE) fail to balance power consumption and latency effectively, leading to increased battery usage and delayed network traffic due to inefficient switching between high and low data activity modes.
Innovation Solution
Implementing a TD-BWP switch mechanism based on parameters such as block error rate (BLER), number of retransmissions, and traffic type, where the UE adds padding bits to transport blocks to reach predetermined slot capacities and transmits messages to the base station to switch between TD-BWPs, allowing for dynamic adjustment of bandwidth usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE stays in BWP #2 to save battery power by transmitting and receiving data sparsely, then power consumption is reduced, but latency increases due to delays and retransmissions in UE traffic
Solution Approach 1:
The patent implements dynamic BWP switching that allows the UE to transition between BWP #1 (dense PDCCH monitoring) and BWP #2 (sparse PDCCH monitoring) based on real-time traffic conditions. The UE monitors for wake-up signals in BWP #2 and switches to BWP #1 when data activity is detected, thereby dynamically balancing power consumption and latency performance according to actual network conditions
Solution Approach 2:
The patent changes the PDCCH monitoring density parameter by switching between different BWPs. In BWP #2, the UE uses sparse monitoring occasions to reduce power consumption, while in BWP #1, the UE uses dense monitoring occasions to reduce latency. This parameter change allows the system to adapt to varying traffic conditions and resolve the contradiction between power saving and latency
2Loss of time
If the UE switches to BWP #1 for dense PDCCH monitoring to reduce latency, then latency is reduced, but power consumption increases
Solution Approach 1:
The system dynamically switches between dense and sparse PDCCH monitoring modes based on traffic conditions. The UE remains in BWP #2 with sparse monitoring during low-activity periods to save power, and only transitions to BWP #1 with dense monitoring when wake-up signals indicate data activity, thereby dynamically resolving the power-latency tradeoff
Solution Approach 2:
The UE employs periodic monitoring of wake-up signals in BWP #2 before switching to dense monitoring in BWP #1. This periodic check allows the system to maintain low power consumption during idle periods while being ready to quickly switch to low-latency mode when needed, resolving the contradiction through periodic state transitions
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.