Mobile Communication Transmitter Power Control Indicator
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Solution Overview
Problem
Current power control mechanisms for control channels in mobile communication networks, such as HSDPA, lack optimal initial power settings, leading to unnecessary high power levels and slow outer loop power control, resulting in suboptimal interference management and high Block Error Rate (BLER) targets.
Innovation Solution
A transmitter and receiver system that transmits an indicator on a control channel to signal the absence of data transmission on a data channel, allowing for power adjustments based on response or lack thereof from the receiver, enabling efficient and fast power control of the control channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safe average power level is applied for HS-SCCH, then reliability of control channel transmission is improved, but interference in the network increases unnecessarily
Solution Approach 1:
The patent applies preliminary action by transmitting an indicator on the control channel before actual data transmission occurs. This indicator signals whether data will be transmitted on the associated data channel, allowing the network to adjust power levels in advance rather than using a safe average power level that causes unnecessary interference.
Solution Approach 2:
The patent implements dynamics by making the control channel power level adjustable based on real-time conditions. The outer loop power control mechanism dynamically adapts the power level according to the indicator transmitted and receiver feedback, replacing the static safe average power level with a dynamic optimization that reduces interference while maintaining reliability.
2Measurement precision
If outer loop power control is used with small BLER target, then power control precision is improved, but power control speed decreases
Solution Approach 1:
The patent applies preliminary action by performing power control adjustments before data transmission begins. The indicator is transmitted in advance, allowing the outer loop power control to be activated and adjusted prior to actual data flow, thereby increasing the speed at which power control can respond to changing conditions without sacrificing precision.
Solution Approach 2:
The patent implements feedback by having the receiver transmit a response on the uplink control channel based on whether data was actually transmitted. This feedback mechanism enables the outer loop power control to quickly adapt to real conditions, accelerating the power control process while maintaining precision through continuous monitoring and adjustment.
3Reliability
If power level for HS-SCCH is increased to ensure reception, then reliability of control channel is improved, but power level for associated uplink control channel becomes too high
Solution Approach 1:
The patent applies preliminary action by signaling the absence of data transmission before the uplink control channel needs to be activated. This allows the system to avoid allocating high power to the uplink control channel when no data transmission is occurring, thereby reducing unnecessary power consumption while maintaining reliability when data is actually present.
Solution Approach 2:
The patent implements dynamics by making the uplink control channel power level adaptive rather than fixed. The power level is dynamically adjusted based on the indicator transmitted and actual data transmission conditions, allowing the system to use lower power when no data is transmitted and increase power only when necessary, thereby optimizing the power-level relationship between downlink and uplink channels.
Data Source
AI summary
A transmitter is included in a mobile communication network. The transmitter is included configured to transmit to a receiver a data channel and a first control channel controlling data transmissions on the data channel, transmit, on the first control channel, an indicator indicating that there is data transmission to the receiver on the data channel. The transmitter also is configured to omit data transmission on the data channel.