Uplink Power Control After Beam Change in mmWave Systems
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Solution Overview
Problem
Wireless communication systems operating in millimeter wave frequencies face disruptions and reduced throughput due to frequent beam changes caused by changing channel conditions, leading to invalid transmission power settings and packet loss.
Innovation Solution
A method and apparatus for adjusting uplink transmission power levels by identifying beam changes and receiving downlink messages with power indications, allowing for initial or subsequent uplink transmissions at appropriate power levels, using additional bits in the downlink message to accommodate drastic power changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming is used to overcome path loss in mmW systems, then signal transmission is improved, but frequent beam changes cause transmission power settings to become invalid, leading to packet loss and communication disruptions
Solution Approach 1:
The base station sends downlink messages with uplink transmission power commands to the UE before the UE performs uplink transmissions after a beam change. This preliminary action ensures that the UE has valid power settings ready before transmitting, preventing packet loss due to invalid power parameters.
Solution Approach 2:
The system implements a feedback mechanism where the base station monitors beam changes and channel conditions, then sends updated power commands to the UE. This closed-loop feedback ensures that power settings remain valid and optimal despite frequent beam changes in mmW systems.
2Manufacturing precision
If additional bits are added to downlink messages to accommodate drastic power changes, then power control accuracy is improved, but message complexity increases
Solution Approach 1:
The power control information is segmented into separate downlink messages or separate fields within messages, allowing the system to transmit detailed power commands with additional precision bits without overwhelming the overall message structure. This segmentation manages complexity while maintaining accuracy.
Solution Approach 2:
The system changes the parameter representation by using additional bits in the power command fields to encode finer power adjustments. This allows more precise power control (e.g., 1dB granularity instead of larger steps) while the structured message format keeps the increased complexity manageable.
Data Source
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AI summary
Uplink transmission power levels may be adjusted in response to changes in a directional beam used for wireless communications. A beam change may be identified, wherein the beam change includes a transition from a first transmission configuration based on a first beam direction of a cell to a second transmission configuration based on a second beam direction of the cell. A downlink (DL) message associated with the beam change may be received, wherein the DL message comprises a transmission power indication. An uplink (UL) message may be transmitted at a power level based at least in part on the transmission power indication.