Selective Uplink DPD Switching for ACLR Violation Management
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Solution Overview
Problem
Power amplifiers in communication networks introduce distortion, particularly out-of-band emission, which is challenging to mitigate without increasing hardware complexity and power consumption, especially in lower frequency ranges like FR1 and FR3, where beamforming techniques are not practical.
Innovation Solution
A mechanism for user devices to transmit reference signals without digital pre-distortion, allowing network devices to determine if DPD is needed, enabling dynamic activation or deactivation based on ACLR violations, thus optimizing uplink transmissions and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If digital pre-distortion is used to reduce out-of-band emission, then ACLR performance is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent implements dynamic DPD activation where the user device transitions between DPD-enabled and DPD-disabled states based on network conditions and ACLR violation detections. The network device configures the user device to monitor ACLR violations and send indication messages to activate or deactivate DPD, making the system adaptive rather than static.
Solution Approach 2:
The patent changes the operational parameter of DPD activation status based on detected conditions. When ACLR violations are detected, the system transitions from a non-DPD state to a DPD-enabled state, effectively changing the distortion compensation parameter dynamically rather than maintaining a fixed configuration.
2Reliability
If digital pre-distortion is continuously activated to reduce distortion, then transmission quality is improved, but power consumption increases
Solution Approach 1:
The system employs periodic monitoring of ACLR violations by the network device and sends periodic indication messages to the user device to determine whether DPD should be activated. This periodic check allows the system to maintain transmission quality when needed while conserving power during normal operation by keeping DPD disabled until violations occur.
Solution Approach 2:
The user device autonomously activates or deactivates DPD based on indication messages received from the network device regarding ACLR violations. The device self-manages its distortion compensation state without requiring continuous network intervention, enabling it to conserve power by maintaining a default disabled state and only activating DPD when necessary.
3Object-generated harmful factors
If DPD is used to meet out-of-band emission requirements, then spectral efficiency is improved, but hardware requirements increase
Solution Approach 1:
The patent extracts the DPD functionality from being a permanently required hardware component and makes it an optional, conditionally activated feature. By separating the DPD engine from mandatory operation and making it available only when ACLR violations are detected, the system reduces baseline hardware requirements while maintaining the capability to meet spectral efficiency requirements when needed.
Data Source
AI summary
This specification describes methods, apparatus, and/or computer programs for selectively utilizing digital pre-distortion in a communication network. According to a first aspect of this specification, there is described a user device including means for transmitting an uplink reference signal to a network device without using digital pre-distortion; means for receiving, from a network device, an indication indicating whether digital pre-distortion is enabled or disabled for performance, by the user device, of subsequent uplink transmissions, wherein the transmitted uplink reference signal is useable for determination of the indication; and means for, when the indication indicates that digital pre-distortion is enabled for performance of subsequent uplink transmissions, performing one or more uplink transmissions using digital pre-distortion, and when the indication indicates that digital pre-distortion is disabled for performance of subsequent uplink transmissions, performing one or more uplink transmissions without using digital pre-distortion.