Network Node Handover Configuration for Wireless Device Scaling
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Solution Overview
Problem
The existing wireless communication systems face a scaling issue in the number of connected devices that can utilize Uplink-based HandOver (UHO) procedures due to limitations in the number of orthogonal uplink sounding sequences, leading to performance drops in densely packed cell scenarios.
Innovation Solution
A method where a first network node configures a first wireless device to transmit an uplink synchronization signal and synchronize to a downlink synchronization signal, while a second wireless device refrains from transmitting an uplink synchronization signal, allowing the network to request a handover based on measurements from the first device's signal, thereby reducing the number of needed uplink synchronization signals and enabling efficient handover for multiple devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all wireless devices transmit uplink synchronization signals for handover measurement, then handover reliability is improved, but the number of available orthogonal sequences is exhausted leading to performance degradation in dense scenarios
Solution Approach 1:
The patent segments the handover measurement process by dividing devices into two groups: those that transmit uplink synchronization signals and those that do not. This segmentation allows the system to manage the limited orthogonal sequences more effectively while maintaining handover reliability for all devices.
Solution Approach 2:
The patent makes the downlink synchronization signal serve multiple functions: it acts as both a synchronization reference for devices and as a measurement signal for handover decisions, replacing the need for separate uplink transmission from all devices.
2Measurement precision
If multiple devices transmit uplink synchronization signals simultaneously, then handover measurement accuracy is improved, but interference increases and sequence resources are depleted
Solution Approach 1:
The patent extracts the measurement function from the uplink synchronization signal transmission and relocates it to the downlink synchronization signal, eliminating the need for simultaneous uplink transmissions from multiple devices and thus reducing interference.
Solution Approach 2:
The patent uses the downlink synchronization signal as a copy or substitute for the uplink measurement signal, allowing devices to perform measurements on the downlink signal instead of requiring separate uplink transmissions.
3Adaptability or versatility
If the system supports an arbitrary number of devices with unique orthogonal sequences, then device capacity is improved, but the system complexity and resource management becomes infeasible
Solution Approach 1:
The patent makes the downlink synchronization signal serve multiple functions simultaneously: synchronization reference, handover measurement signal, and resource allocation indicator, thereby supporting arbitrary device capacity without increasing sequence resource complexity.
Data Source
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AI summary
A first Network Node (NN) (206) and a method therein for enabling handover of a first and a second wireless device (210, 212) from the first NN to a second NN (208). The first NN determines that the second wireless device is to refrain from transmitting an uplink synchronization signal. Based on the determination, the first NN configures the first wireless device to transmit an uplink synchronization signal and to synchronize to a first downlink synchronization signal, an configures the second wireless device to synchronize to a second downlink synchronization signal. The first NN receives, from the second NN, information relating to a measurement performed on the uplink synchronization signal transmitted only from the first wireless device. Based on the received information, the first NN requests the second NN to perform the handover of the first and second wireless devices.