Network Node Timing Advance Calculation for Fixed Wireless Devices
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Solution Overview
Problem
In wireless communication networks, particularly for stationary or semi-stationary devices like NB-IoT, the process of establishing a connection for data transmission is complex due to the need for Timing Advance (TA) estimation, which consumes power and processing resources, especially when devices are deep in coverage areas with poor radio conditions.
Innovation Solution
A method where the network node determines the Timing Advance without requiring UpLink transmission, sending this TA to the device, allowing for simplified Radio Resource Control signaling to establish a connection, thereby reducing the complexity and resource consumption of the connection establishment process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Timing Advance estimation is performed through conventional uplink transmission procedures, then accurate timing synchronization is achieved, but power consumption and processing resource usage increase significantly
Solution Approach 1:
The network node acts as an intermediary by calculating the timing advance value based on downlink transmission timing and device location information, then providing this pre-calculated TA value to the device through signaling. This eliminates the need for the device to perform complex uplink transmission and timing estimation procedures, thereby reducing device power consumption while maintaining accurate timing synchronization.
2Measurement precision
If conventional TA estimation procedures are used, then timing advance is obtained accurately, but connection establishment complexity increases
Solution Approach 1:
The network node performs preliminary calculation of the timing advance value before the device needs to transmit uplink data. By pre-calculating TA based on downlink timing and device location, and providing it through signaling, the complex estimation procedure is moved to the network side in advance, simplifying the device's connection establishment process while maintaining timing accuracy.
3Reliability
If standard uplink transmission procedures are followed for TA acquisition, then reliable timing synchronization is established, but network processing capacity is consumed
Solution Approach 1:
The network node serves itself by calculating the timing advance value internally using its own downlink transmission timing information and device location data. This self-service approach eliminates the need for additional uplink transmission procedures between device and network, reducing network processing capacity consumption while maintaining reliable timing synchronization through the pre-calculated TA value.
Data Source
AI summary
A method performed by a network node for establishing a connection for data transmission between the network node and the wireless device in a wireless communication network is provided. The network node establishes that the wireless device is fixed. Fixed comprises always being served by the same one or more access points. The network node obtains a Timing Advance (TA) for transmissions between the network node and the wireless device, based on the distance between the network node and the wireless device. The obtaining of the TA is performed without Uplink (UL) transmission. The network node sends an indication to the wireless device, which indication indicates the obtained TA. The network node then establishes a connection for data transmission between the network node and the wireless device based on the sent TA in Radio Resource Control, RRC, signaling.