HSPA Power Control for Dual Uplink Signal Leakage
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Solution Overview
Problem
In High Speed Packet Access (HSPA) networks, dual uplink transmissions face challenges due to signal leakage from insufficient frequency separation between transmit and receive frequencies, leading to degradation of Signal-to-Noise Ratio (SNR) in Dual-Cell HSUPA, where deactivating the secondary uplink frequency is beyond user equipment (UE) control and affects DC-HSDPA reception.
Innovation Solution
A device and method for power control in HSPA networks that includes an antenna, transceiver, and processor to dynamically adjust outbound signal power levels based on inbound signal power thresholds, allowing for reduced maximum power transmission when inbound signal power is below a certain level, thereby minimizing signal leakage and ensuring acceptable SNR during dual uplink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dual uplink transmissions are used in DC-HSUPA to increase bandwidth and improve resource utilization, then uplink speeds and capacity are improved, but signal leakage occurs due to insufficient frequency separation between transmit and receive frequencies, degrading SNR
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the transmit power level based on received signal quality measurements. When the received signal power falls below a threshold, the system reduces the maximum transmit power from a first level to a second level, thereby changing the power parameter to mitigate signal leakage while maintaining dual uplink transmission benefits
Solution Approach 2:
The patent implements feedback by continuously monitoring the power level of received inbound signals and using this information to control the power level of outbound transmissions. The processor measures received signal power and adjusts transmit power accordingly, creating a closed-loop control system that adapts to changing channel conditions to prevent signal leakage
2Object-affected harmful factors
If the secondary uplink frequency is deactivated to protect DC-HSDPA reception, then SNR is improved, but resource utilization and spectrum efficiency are reduced
Solution Approach 1:
The patent applies dynamics by making the transmit power level adjustable and adaptable rather than fixed. The system dynamically switches between a first maximum power level and a second reduced power level based on real-time received signal conditions, allowing flexible adaptation to protect DC-HSDPA reception while maintaining dual uplink operation when conditions permit
Solution Approach 2:
The patent applies preliminary action by proactively reducing transmit power when received signal power falls below a threshold before severe signal leakage and SNR degradation occur. This preventive approach avoids the need to deactivate the secondary uplink frequency while still protecting DC-HSDPA reception
Data Source
AI summary
A wireless communication device includes: an antenna for receiving inbound signals on dual receive channels and transmitting outbound signals on dual transmit channels; a transceiver coupled to the antenna to receive the inbound signals from the antenna and convey the outbound signals; a power controller coupled to the transceiver to control power levels of the outbound signals so a maximum nominal power level of the outbound signals is a first power level; and a processor coupled to the transceiver and the antenna to cause the power controller to control the power levels of the outbound signals so if a power level of a received one of the inbound signals is below a threshold value, then the maximum nominal power level of the outbound signals is a second power level lower than the first power level, wherein the second power level is lower than the first power level.