Cellular Power Mask Control for OFDM Ramp Interference
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Solution Overview
Problem
Current transmission output power control in E-UTRAN networks experiences signal quality degradation and interference due to abrupt power changes during transient periods, which affects the quality of signals like the sounding reference symbol and data symbols, and limits throughput.
Innovation Solution
Adapting pre-defined power masks based on signal transmission characteristics, such as content, network conditions, and scheduling information, to optimize the position and duration of power ramps, thereby minimizing interference and ensuring high-quality signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmitter is turned on slightly before the actual signal is transmitted to allow the transmitter to reach the on state, then the signal quality is improved, but the transmitted energy causes interference to other user equipment
Solution Approach 1:
The patent segments the power ramping process by applying different power masks to different signal types (reference signals vs. data symbols). Reference signals receive a first power mask that allows earlier ramping to ensure quality, while data symbols receive a second power mask that delays or reduces ramping to minimize interference to other users.
Solution Approach 2:
The patent applies different power mask characteristics to different parts of the transmitted signal. Reference signals (which require high quality for channel estimation) are treated differently from data symbols. This local differentiation allows optimal quality where needed while minimizing overall interference.
2Object-generated harmful factors
If the transmitter is turned off before the transmission of the signal has been completed, then the interference to other timeslots is reduced, but the signal quality degrades during the transient period
Solution Approach 1:
The patent segments the power down process by applying different power masks to different signal types. Data symbols receive a power mask that allows earlier power reduction to minimize interference, while reference signals maintain higher power longer to ensure quality.
Solution Approach 2:
Different parts of the signal transmission are treated with different power mask characteristics during the power down phase, ensuring that critical reference signals maintain quality while less critical data symbols can be reduced earlier to minimize interference.
3Ease of operation
If fixed power ramps are defined in the standard to manage transient periods, then the system operation is simplified, but the signal quality and interference management are compromised
Solution Approach 1:
The patent introduces dynamic power masks that can be adapted based on signal type and transmission conditions. Instead of fixed power ramps, the system uses configurable power masks that allow the network to optimize the balance between signal quality and interference management for different scenarios.
Solution Approach 2:
The patent changes the parameters of the power masks based on the type of signal being transmitted. Different power mask parameters (duration, slope, timing) are applied to reference signals versus data symbols, allowing flexible optimization of both quality and interference characteristics.
Data Source
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AI summary
The present invention relates to the area of wireless communication, and especially to a method and an arrangement for transmission output power control in a cellular telecommunications network. An improved transmission output power control is achieved by adapting a pre-defined power mask to a signal transmission characteristic of the signal transmission and applying the adapted power mask to a sub-frame or an OFDM symbol. The present invention could be implemented in a network node such as an eNodeB or in a user equipment.