Dual Carrier Interference Control via Power Assignment
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Solution Overview
Problem
In wireless communication systems, particularly in dual carrier HSUPA deployments, interference control is challenging when a user equipment (UE) transmits on multiple carriers, with some base stations not supporting simultaneous multi-carrier reception, leading to potential interference and reduced performance.
Innovation Solution
The method involves assigning a maximum transmission power to one carrier that does not exceed the transmission power of another carrier received by the base station, using path loss measurements and rules to manage interference, and signaling for power reduction on carriers not supported by the base station, ensuring efficient dual carrier operation without causing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a UE transmits on multiple carriers simultaneously in dual carrier HSUPA deployment, then the peak data rate is doubled from 21 Mbps to 42 Mbps, but interference is generated at base stations not capable of simultaneous multi-carrier reception
Solution Approach 1:
The patent applies local quality by differentiating transmission power levels for different carriers based on the reception capability of the target base station. Specifically, the UE transmits at full power on carriers received by the serving base station while reducing power on carriers not received by non-dual-carrier-capable base stations, thereby locally optimizing power distribution to eliminate interference while preserving throughput gains
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the transmission power parameter for specific carriers based on path loss measurements and base station capabilities. The network configures the UE with path loss references and power offset parameters, enabling the UE to calculate and apply appropriate power reduction on specific carriers to prevent interference while maintaining overall transmission efficiency
2Object-generated harmful factors
If transmission power is reduced on one carrier to prevent interference, then interference at non-dual-carrier-capable base stations is reduced, but power balance across carriers may become unbalanced
Solution Approach 1:
The patent employs feedback mechanisms where the network continuously monitors path loss conditions and power balance status, then provides configuration updates to the UE. The network sends path loss reference signals and power offset parameters based on current channel conditions, enabling the UE to dynamically adjust transmission power to maintain balance while preventing interference
Solution Approach 2:
The patent applies dynamics by making transmission power flexible and adaptive rather than static. The UE continuously calculates required power adjustments based on real-time path loss measurements and network configurations, allowing power distribution across carriers to dynamically adapt to changing channel conditions and base station capabilities, thereby maintaining power balance while preventing interference
Data Source
AI summary
A method for controlling interference is described. The method includes receiving an indication that a first carrier is not received by a first base station and a second carrier is received by the first base station (610). Assigning a maximum transmission power for the first carrier so as not to exceed a transmission power for the second carrier is also included (620). The method also includes simultaneously transmitting from a UE on at least the first carrier and the second carrier. Transmitting on the first carrier is performed in accordance with the maximum assigned transmission power (630). Apparatuses and computer readable media are also described.