CDMA Base Station Receive Power Measurement via EDCH Prohibition
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Solution Overview
Problem
Conventional CDMA mobile communication systems cannot measure the total receive power of uplink frames transmitted over non-EDCH channels, hindering admission control and congestion control processes.
Innovation Solution
Implementing a transmission prohibition period for EDCH frames allows the base station to measure the total receive power of uplink frames not transmitted over dedicated channels, enabling accurate admission and congestion control by separating and calculating signal components using an EDCH respread unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the base station measures total receive power including both EDCH and non-EDCH frames simultaneously, then the measurement covers all uplink transmissions, but the base station cannot obtain the total receive power of non-EDCH frames separately
Solution Approach 1:
The patent segments the measurement process into two distinct time periods: an EDCH measurement period where only EDCH frames are measured, and a non-EDCH measurement period where only non-EDCH frames are measured. This temporal segmentation allows the base station to separately obtain receive power information for different frame types that would otherwise be mixed in simultaneous measurement.
Solution Approach 2:
The patent implements periodic switching between EDCH measurement periods and non-EDCH measurement periods. During EDCH measurement periods, EDCH frames are transmitted and measured; during non-EDCH measurement periods, EDCH transmission is prohibited and non-EDCH frames are measured. This periodic action enables separate power measurements for different frame types.
2Measurement precision
If a transmission prohibition period for EDCH is implemented, then the base station can measure non-EDCH receive power accurately, but the EDCH transmission is interrupted during the measurement period
Solution Approach 1:
The patent employs periodic measurement periods where EDCH transmission is temporarily prohibited only during non-EDCH measurement intervals, while EDCH transmission continues during EDCH measurement periods. This periodic approach minimizes the impact on overall EDCH transmission efficiency while enabling accurate non-EDCH power measurements during designated windows.
Solution Approach 2:
The base station preliminarily schedules and notifies mobile stations about upcoming non-EDCH measurement periods before they occur. This allows mobile stations to prepare by suspending EDCH transmissions in advance, ensuring accurate measurements without last-minute interruptions that would degrade transmission efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise measurement of total receive power for non-EDCH frames, facilitating effective admission and congestion control in CDMA mobile communication systems.
Implementation Method 1
an EDCH respread unit for separating a received signal into individual signal components
Data Source
AI summary
The receive power of uplink signals in a CDMA mobile communication system is measured by prohibiting a mobile station from transmitting an uplink signal including a frame over a first channel during a predetermined transmission prohibition period, and measuring a receive power of uplink signals at a base station transmitted from each of the mobile stations located in a cell during the prohibition period. Another method of measuring the receive power includes measuring a first receive power of uplink signals at a base station from each mobile station located in a cell, and measuring each second receive power of uplink signal including a frame only over a first channel transmitted from each mobile station, and then calculating a total receive power of uplink signals excluding frames over the first channel by subtracting respective second receive powers from the first receive power.