Smart Modem Uplink Power Distribution for TCP Feedback Reliability
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Solution Overview
Problem
In 5G NR networks, packet loss and delays in uplink transmission lead to decreased TCP Downlink Throughput, causing network capacity failures due to the adjustment of the congestion window in response to feedback from receivers.
Innovation Solution
A power-adjusting method for user equipment (UE) that dynamically adjusts transmission power based on the type of data being transmitted, increasing power for specific messages like TCP ACKs and decreasing power for normal data to meet time-averaged power density or specific absorption rate standards, thereby reducing packet loss and delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sender decreases the congestion window (CWND) in response to packet loss or delay feedback, then packet loss and delays are addressed, but the TCP Downlink Throughput (DL Tput) suffers and network capacity cannot be achieved
Solution Approach 1:
The patent applies local quality by differentiating transmission power based on packet type. Critical packets (TCP ACKs, RLC status PDUs) receive enhanced transmission power to ensure reliable delivery, while normal data packets use standard power levels. This selective approach improves reliability for critical feedback without unnecessarily reducing overall throughput.
Solution Approach 2:
The patent changes the transmission power parameter dynamically based on packet content. When a packet contains critical messages like TCP ACKs or RLC status PDUs, the transmission power is increased above the default level. This parameter adjustment ensures that crucial feedback packets are delivered reliably, preventing unnecessary CWND reductions while maintaining overall network throughput.
2Reliability
If transmission power is increased for all packets, then packet loss and delays are reduced, but power consumption increases and may exceed time-averaged power density or specific absorption rate limits
Solution Approach 1:
The patent implements local quality by applying different transmission power levels to different packet types. Only critical packets (TCP ACKs, RLC status PDUs) transmit at enhanced power levels, while normal data packets use standard power consumption. This selective approach maintains reliability for critical communications without excessive overall power usage.
Solution Approach 2:
The patent applies partial action by increasing transmission power only for specific critical packets rather than all packets. This partial enhancement ensures that essential feedback packets are delivered reliably while avoiding the excessive power consumption that would result from uniformly increasing power for all transmissions, thus complying with time-averaged power density and SAR limits.
3Reliability
If transmission power is uniformly maintained at high levels, then packet loss is minimized, but the average transmission power may exceed regulatory limits such as time averaged power density (TA-PD) or time averaged specific absorption rate (TA-SAR)
Solution Approach 1:
The patent applies local quality by selectively enhancing transmission power only for critical packets (TCP ACKs, RLC status PDUs) while using standard power for normal data. This localized power enhancement maintains uplink transmission reliability for crucial feedback without causing the average transmission power to exceed TA-PD or TA-SAR regulatory limits.
Solution Approach 2:
The patent uses partial action by applying elevated transmission power only to specific critical packets rather than uniformly to all packets. This approach ensures that essential uplink feedback is transmitted reliably while keeping the time-averaged transmission power within regulatory compliance limits for power density and specific absorption rate.
Data Source
AI summary
A power-adjusting method for uplink transmission is provided. The power-adjusting method is applied to user equipment (UE). In response to the UE transmitting a first packet carrying a specific message to a network node, the power-adjusting method includes the UE increasing the transmission power to transmit the first packet.