5G Uplink Management for FCC Exposure Limits
Solution Overview
Problem
5G mobile networks face challenges in complying with Federal Communications Commission (FCC) exposure limits at higher frequencies, particularly due to the limitations on uplink (UL) transmission caused by human body proximity, leading to potential disconnection or reduced performance when UL is limited or unavailable.
Innovation Solution
The implementation of a method and apparatus that allow the network to detect and manage limited or unavailable uplink transmissions by configuring user equipment (UE) to report issues, using combined layer 2 UCI and RRC layer measurement results, and activating reduced acknowledgement modes or handover procedures to maintain connectivity, while adhering to FCC MPE rules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If 5G networks operate at higher frequencies to provide enhanced mobile broadband and ultra-reliable low-latency communication, then network capacity and data rates are improved, but uplink transmission becomes limited or unavailable due to FCC exposure limits when human body is in proximity
Solution Approach 1:
The patent implements dynamic switching between different communication modes based on uplink availability. The network entity monitors uplink transmission status and dynamically transitions from normal full-duplex mode to reduced acknowledgment mode or asymmetric mode when uplink is limited, and switches back when uplink becomes available. This dynamic adaptation resolves the contradiction by allowing the system to operate at high frequencies for improved productivity while maintaining reliability through mode switching when exposure limits are reached.
Solution Approach 2:
The patent changes key communication parameters including acknowledgment frequency, uplink/downlink resource allocation ratios, and transmission power levels based on uplink availability status. In reduced acknowledgment mode, the network reduces the frequency of uplink acknowledgments and adjusts resource allocation to favor downlink. These parameter changes enable continuous operation at higher frequencies while adapting to varying uplink constraints imposed by FCC exposure limits, thus maintaining both productivity and reliability.
2Reliability
If the network switches to reduced acknowledgement mode or handover procedures to maintain connectivity when UL is limited, then connection reliability is improved, but network complexity and overhead increase
Solution Approach 1:
The patent configures the user equipment in advance with multiple communication mode capabilities including reduced acknowledgment mode and asymmetric mode. The network entity pre-configures the UE with the necessary parameters and procedures for switching between modes. This preliminary preparation reduces the complexity of real-time decision-making and execution, as the switching mechanisms are already established and configured before uplink limitations occur, thereby improving connection reliability without proportionally increasing operational complexity.
3Measurement precision
If the network continuously monitors UL transmission status and configures UE to report issues, then detection accuracy is improved, but signaling overhead and processing requirements increase
Solution Approach 1:
The patent implements a feedback mechanism where the user equipment monitors uplink transmission status and provides periodic reports to the network entity. The network entity configures the UE to report when uplink transmission is limited or unavailable, creating a closed-loop feedback system. This feedback approach improves detection accuracy by utilizing local measurements at the UE while managing signaling overhead through configured reporting intervals and event-triggered reporting, rather than continuous bidirectional monitoring.
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for handling limited or unavailable uplink (UL). One method may include receiving, from a user equipment, an indication that uplink transmission is limited or unavailable.