UMTS Initial Transmission Power Calculation in Physical Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In UMTS user equipment, calculating initial transmission power prior to communication is challenging due to the lack of established closed loop power control, requiring open loop methods that rely on broadcast system information and measured signal power, which can be inefficient and power-consuming.
Innovation Solution
A method and apparatus for calculating initial transmission power in UMTS user equipment by receiving broadcast system information, measuring signal power, and calculating the initial transmission power in the lower physical layer, reducing the need for RRC-L1 signaling and allowing for faster and more power-efficient communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If open loop power control method is used to calculate initial transmission power, then transmission power can be calculated prior to communication establishment, but the calculation process requires extensive RRC-L1 signaling which increases signaling overhead and power consumption
Solution Approach 1:
The patent extracts the initial transmission power calculation from the higher layer RRC protocol and relocates it to the lower physical layer L1. This separation removes the need for extensive RRC-L1 signaling exchanges, as the calculation is performed autonomously at L1 using locally available broadcast system information and measured signal power, thereby reducing both signaling overhead and power consumption.
Solution Approach 2:
The lower physical layer L1 is empowered to perform the initial transmission power calculation autonomously using locally available information (broadcast system information and measured signal power). This self-service approach eliminates the need for the UE to request and receive power calculation instructions from the network via RRC signaling, reducing both signaling overhead and power consumption while maintaining calculation reliability.
2Reliability
If open loop power control method is used with RRC-L1 signaling, then initial transmission power can be calculated, but the signaling overhead increases and communication speed decreases
Solution Approach 1:
The patent extracts the initial transmission power calculation from the higher layer RRC protocol and relocates it to the lower physical layer L1. This separation removes the need for extensive RRC-L1 signaling exchanges, as the calculation is performed autonomously at L1 using locally available broadcast system information and measured signal power, thereby reducing both signaling overhead and power consumption.
Solution Approach 2:
The necessary information for power calculation (broadcast system information) is prepared and made available in advance by the network, and the UE measures signal power before needing to calculate transmission power. This preliminary preparation enables the L1 layer to perform the calculation immediately when needed, without waiting for RRC signaling exchanges, thus improving communication speed.
3Reliability
If PIP calculation is performed in higher layers with broadcast information, then power control can be established, but the process requires multiple signaling steps between RRC and L1 layers
Solution Approach 1:
The patent extracts the initial transmission power calculation from the higher layer RRC protocol and relocates it to the lower physical layer L1. This separation removes the need for extensive RRC-L1 signaling exchanges, as the calculation is performed autonomously at L1 using locally available broadcast system information and measured signal power, thereby reducing both signaling overhead and power consumption.
Solution Approach 2:
The lower physical layer L1 is empowered to perform the initial transmission power calculation autonomously using locally available information (broadcast system information and measured signal power). This self-service approach eliminates the need for the UE to request and receive power calculation instructions from the network via RRC signaling, reducing both signaling overhead and power consumption while maintaining calculation reliability.
Data Source
AI summary
A method and apparatus for calculating an initial transmission power in a mobile telecommunications system is disclosed, the system comprising a network of a plurality of cells and at least one user equipment device. The user equipment device receives broadcast system information, and measures a signal power. An initial transmission power is calculated in a lowest logical layer of the system defined as a protocol stack, using the received information and measured power.