Dynamic Multi-Mode Secondary Cell Synchronization for Energy-Latency Tradeoffs
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Solution Overview
Problem
Existing wireless communications systems face challenges in providing effective energy savings and channel usage for synchronization signaling of secondary cells, particularly in scenarios involving intra-band and inter-band carrier aggregation, where the primary cell provides synchronization signaling for secondary cells that refrain from transmitting synchronization signal blocks, leading to potential latency issues in on-demand schemes.
Innovation Solution
Implementing multi-mode synchronization signaling for secondary cells, which includes an energy saving mode and an active mode, allowing the network entity to dynamically switch between these modes based on traffic levels, with energy saving settings such as increased periodicity and reduced synchronization signaling during idle or deactivated states, and active mode settings with shorter periodicity and more information during connected or activated states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the primary cell provides synchronization signaling for secondary cells in energy saving mode, then energy consumption is reduced, but synchronization latency increases
Solution Approach 1:
The patent implements dynamic mode switching for synchronization signaling, where the secondary cell can transition between first mode (energy saving) and second mode (low latency) based on traffic conditions. This dynamic adjustment resolves the contradiction by allowing the system to optimize for energy consumption during idle periods while switching to low-latency operation when traffic requires it.
Solution Approach 2:
The patent changes the operational parameters of synchronization signaling by defining at least two different modes with distinct characteristics. The first mode uses increased periodicity and reduced signaling for energy saving, while the second mode uses shorter periodicity and more frequent signaling for low latency. This parameter variation allows the system to resolve the energy-latency tradeoff.
2Loss of energy
If synchronization signal periodicity is increased in energy saving mode, then energy consumption decreases, but synchronization update speed decreases
Solution Approach 1:
The periodicity of synchronization signals is made dynamic rather than fixed. The system can adjust the periodicity based on the operational mode - using longer periodicity in energy saving mode to reduce consumption, and switching to shorter periodicity in active mode to improve update speed when needed.
Solution Approach 2:
The patent employs periodic synchronization signaling with variable periods. By controlling the periodicity of signal transmission according to the operational mode, the system achieves energy efficiency during extended periods while maintaining the capability for faster updates when traffic conditions change.
3Quantity of substance
If the secondary cell refrains from transmitting synchronization signal blocks, then channel resources are conserved, but on-demand switching latency increases
Solution Approach 1:
The system performs preliminary configuration of at least two synchronization signal modes during initial setup, so that when switching is needed, the alternative mode is already prepared and can be activated immediately. This preliminary preparation eliminates the need for on-demand signal generation, thus reducing switching latency while still conserving channel resources during idle periods.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for multi-mode synchronization signaling of a secondary cell. An example method for wireless communications by an apparatus includes obtaining, via a first cell, a first configuration for communications via a second cell; obtaining an indication to switch from a first mode to a second mode for synchronization signal communications via the second cell, wherein the first mode is different than the second mode; obtaining, via the second cell, at least one synchronization signal in accordance with the second mode; and communicating one or more signals via the second cell based at least in part on the at least one synchronization signal.