Dynamic Second-Stage Synchronization Signals for Dense TRP Networks
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Solution Overview
Problem
In cell-free networks with high transmission and reception point density, synchronization signal resources are limited, leading to increased resource consumption and power consumption during synchronization signal transmission as the number of TRPs increases.
Innovation Solution
The method and apparatus adjust the sending configuration parameters of second-stage synchronization signals, including synchronization raster, frequency-domain and time-domain positions, offsets, mapping relationships, quantity, and transmission states, which are indicated by a network-side device to a terminal, to optimize synchronization signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the quantity of TRPs is increased to improve network coverage and capacity, then the network performance is improved, but the quantity of synchronization signals increases leading to higher resource consumption and power consumption
Solution Approach 1:
The patent implements dynamic adjustment of synchronization signal transmission by introducing adjustable parameters including sending period (default 20ms, adjustable to 40ms, 80ms, etc.), transmission state (enabled/disabled), and quantity of synchronization signals. The network-side device can dynamically modify these parameters based on terminal access status and signal quality feedback, allowing the system to adapt transmission intensity to actual network conditions and reduce power consumption when full synchronization signal transmission is not required.
Solution Approach 2:
The patent changes multiple parameters of synchronization signals to optimize the balance between network performance and power consumption. Key parameters include: sending period (time interval between transmissions), transmission state (on/off), quantity of signals per period, frequency-domain position, time-domain position, and synchronization raster. By adjusting these parameters, the system can reduce the frequency and quantity of synchronization signal transmissions while maintaining adequate network coverage and terminal access capability.
2Area of stationary object
If the quantity of TRPs is increased to improve network coverage, then the coverage area is expanded, but the resource consumption for synchronization signal transmission increases
Solution Approach 1:
The patent merges synchronization signal resources across multiple TRPs by allowing different TRPs to use the same or overlapping synchronization signal parameters. The network-side device can configure TRPs to share synchronization signal resources, including using identical frequency-domain positions, time-domain positions, and synchronization raster values. This resource sharing approach reduces the total quantity of synchronization signals needed to cover the same area, thereby reducing resource consumption while maintaining expanded coverage.
3Productivity
If synchronization signal resources are reused in different cells to improve resource efficiency, then resource utilization is improved, but synchronization signal interference increases
Solution Approach 1:
The patent resolves interference from resource reuse by introducing additional dimensional separation beyond simple frequency and time domains. This includes using different synchronization raster values (which create frequency offsets), different beam directions/spatial filters, and different association relationships between synchronization signals and random access resources. By separating signals across multiple dimensions, the system can reuse the same time-frequency resources in different cells while minimizing interference through spatial and spectral separation.
4Measurement precision
If the sending period of synchronization signals is reduced to improve synchronization accuracy, then synchronization precision is improved, but power consumption increases
Solution Approach 1:
The patent applies partial action by transmitting synchronization signals at reduced periods only when necessary for maintaining synchronization accuracy, rather than continuously at high frequency. The system monitors terminal access status and signal quality, and only reduces the sending period (to 20ms or shorter) when actual synchronization issues are detected or during periods of high terminal activity. During normal operation with stable conditions, the system uses longer periods (40ms, 80ms, or more) to conserve power, thus applying synchronization signal transmission partially rather than continuously.
Data Source
AI summary
An information transmission method and apparatus, a terminal, and a network-side device. The information transmission method in embodiments of this application includes: receiving, by a terminal, first indication information sent by a network-side device via system information associated with a first-stage synchronization signal and/or a second-stage synchronization signal, where the first indication information is used to indicate an adjusted sending configuration parameter of the second-stage synchronization signal.