Time-Domain BWP Switching for Carrier Aggregation Latency Control
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Solution Overview
Problem
Existing carrier aggregation systems face challenges in balancing UE power consumption and latency, particularly when UE is in a low-data activity bandwidth part (BWP) experiencing delays and retransmissions.
Innovation Solution
Implementing mechanisms for time domain bandwidth part (TD-BWP) switching in carrier aggregation networks based on UE traffic conditions, such as block error rate (BLER), retransmissions, and traffic type, using padded transport blocks or predetermined messages to dynamically switch between high and low data activity BWPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE stays in BWP #2 for sparse PDCCH monitoring occasions, then power consumption is reduced, but latency increases due to delays and retransmissions
Solution Approach 1:
The system dynamically switches between BWP #1 and BWP #2 based on real-time traffic conditions. The UE monitors traffic patterns and transitions from sparse monitoring (BWP #2, low power) to dense monitoring (BWP #1, low latency) when traffic activity increases, resolving the contradiction between power saving and latency reduction
Solution Approach 2:
The system changes the monitoring density parameter by switching BWPs. In BWP #2, PDCCH monitoring is sparse (reducing power consumption), while in BWP #1, PDCCH monitoring is dense (reducing latency). The UE adjusts this parameter based on traffic conditions to balance power and latency
2Use of energy by moving object
If the UE switches between dense and sparse PDCCH monitoring, then power efficiency is improved, but system complexity increases
Solution Approach 1:
The system segments PDCCH monitoring into two distinct modes: dense monitoring (BWP #1) for high traffic conditions and sparse monitoring (BWP #2) for low traffic conditions. This segmentation allows the UE to achieve power efficiency through simple mode switching rather than complex continuous adjustment mechanisms
3Loss of time
If the UE uses BWP #1 for dense PDCCH monitoring, then latency is reduced, but power consumption increases
Solution Approach 1:
The UE employs periodic evaluation of traffic conditions to determine when to switch from BWP #2 (sparse monitoring, low power) to BWP #1 (dense monitoring, low latency). This periodic assessment allows the system to maintain low power consumption during idle periods while quickly transitioning to low-latency mode when traffic arrives
Data Source
AI summary
Some aspects of this disclosure relate to apparatuses and methods for implementing time domain bandwidth part (TD-BWP) switch for carrier aggregation (CA) for balancing between the UE power consumption and a latency of the UE. For example, the UE includes one or more transceivers configured to wirelessly communicate with a base station on a plurality of component carriers (CCs) in a carrier aggregated (CA) network. The UE also includes a processor communicatively coupled to the one or more transceivers. The processor is configured to perform a time domain bandwidth part (TD-BWP) switch on a first CC of the plurality of CCs when the UE and the base station are communicating on the first CC. The processor is further configured to perform the TD-BWP switch on a second CC of the plurality of CCs when the UE and the base station are communicating on the second CC.