Dynamic 5G Receiver Bandwidth Switching for Power Consumption
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently adapting receiver bandwidth to optimize power consumption and control channel operation, particularly in 5G networks, due to varying WTRU activities and network configurations.
Innovation Solution
Implementing receiver bandwidth adaptation mechanisms in WTRUs and network layers (L1 and L2) based on WTRU activity, allowing for dynamic changes in receiver bandwidth in response to buffer status, PRACH transmissions, RRC state changes, and other factors, with explicit acknowledgments and retuning time management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If receiver bandwidth is increased to improve control channel operation and data reception capability, then network performance is improved, but power consumption increases
Solution Approach 1:
The receiver bandwidth is made dynamic by allowing the WTRU to switch between different bandwidth configurations (first BW configuration and second BW configuration) based on activity conditions. The bandwidth is not fixed but adapts to the current operational state, enabling the system to optimize between performance and power consumption in real-time.
Solution Approach 2:
The patent changes the bandwidth parameter of the receiver based on WTRU activity status. When activity is detected (new data in buffer, BSR transmission, PRACH transmission, RRC state change), the receiver bandwidth is switched from a first configuration to a second configuration, and vice versa when inactive. This parameter adaptation directly addresses the contradiction by adjusting bandwidth according to actual needs.
2Loss of energy
If receiver bandwidth is decreased to reduce power consumption during idle periods, then energy efficiency is improved, but control channel operation capability deteriorates
Solution Approach 1:
The system performs preliminary actions by pre-configuring multiple bandwidth configurations and establishing clear triggering conditions for switching between them. The WTRU is prepared with both a first BW configuration (lower bandwidth for power saving) and a second BW configuration (higher bandwidth for full operation), along with predefined activity conditions that trigger the appropriate switch, ensuring reliability is maintained when needed.
Solution Approach 2:
The patent implements feedback mechanisms where the WTRU monitors its own activity status (buffer status, transmission state, RRC state) and provides feedback by switching bandwidth configurations accordingly. The explicit acknowledgment of bandwidth adaptation and the monitoring of activity conditions create a closed-loop system that ensures control channel operation capability is maintained through feedback-driven bandwidth adjustment.
3Reliability
If explicit bandwidth adaptation signaling is implemented to ensure reliable bandwidth changes, then control reliability is improved, but signaling overhead and complexity increase
Solution Approach 1:
The WTRU autonomously determines when to switch bandwidth configurations by self-monitoring its own activity conditions (new data in buffer, BSR transmission, PRACH transmission, RRC state change). The device serves itself by making bandwidth adaptation decisions based on pre-configured rules, reducing the need for complex continuous signaling from the network while maintaining reliability through self-awareness of operational state.
Data Source
AI summary
A receiver bandwidth adaptation for radio access technologies (RATs) may be for a New Radio (NR) or 5G flexible RAT. A WTRU control channel (e.g., receiver) bandwidth may change, for example, based on monitoring a downlink channel for an indication using a bandwidth (BW) associated with a first BW configuration. The indication may include a signal to change the receiver BW. The WTRU may change the receiver BW associated with the first BW configuration to a second BW configuration when the WTRU receives the indication on a downlink (DL) channel. The WTRU may perform one or more measurements associated with the second BW configuration in response to the change of the receiver BW to the second BW configuration. The WTRU may transmit measurement information to a network entity. The WTRU may receive a DL transmission from the network using the second BW configuration.