Dual Connectivity Random Access Power Management
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Solution Overview
Problem
Dual connectivity-enabled User Equipment (UE) faces challenges in performing random access procedures with multiple evolved Node Bs (eNBs) simultaneously due to power constraints, leading to potential random access failures when total transmit power exceeds the maximum allowed limit.
Innovation Solution
The proposed solution involves prioritizing preamble transmissions, adjusting transmit powers, and controlling preamble transmissions to prevent power overshoot, including methods such as transmitting high-priority preambles first, suspending low-priority transmissions during overlaps, and adjusting powers proportionally to the maximum allowed power, to ensure successful communication with multiple eNBs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dual connectivity-enabled UE performs random access procedures with multiple eNBs simultaneously, then communication capability and data rate are improved, but total transmit power exceeds maximum allowed limit causing random access failures
Solution Approach 1:
The system performs preliminary power calculation and determination before actual preamble transmission. The UE calculates required transmit power for each eNB in advance, determines whether simultaneous transmission is feasible, and prepares power adjustment strategies before the random access procedure begins, preventing power overflow issues before they occur
Solution Approach 2:
The transmit power is made dynamic and adjustable based on real-time conditions. The UE can adjust the transmit power for each eNB individually, suspend or cancel low-priority preamble transmissions when power constraints are detected, and dynamically allocate power resources to maintain reliable communication within maximum power limits
2Productivity
If UE transmits preambles to multiple eNBs in parallel, then access efficiency is improved, but power management complexity increases
Solution Approach 1:
The power management process is segmented into distinct functional modules: power calculation unit that computes required power for each eNB, determination unit that assesses simultaneous transmission feasibility, and control unit that manages actual transmission. This segmentation allows complex power management to be handled through coordinated simple operations
Solution Approach 2:
The determination unit acts as an intermediary between the power calculation unit and the transmission control unit. It receives power requirement information, evaluates whether simultaneous transmission exceeds maximum power limits, and generates appropriate control decisions (transmit, suspend, or cancel), simplifying the overall power management architecture
3Reliability
If UE adjusts transmit power to meet maximum limit, then power constraint compliance is improved, but transmit power for individual eNBs may be insufficient
Solution Approach 1:
Different quality levels of service are provided to different eNBs based on local conditions and priority. High-priority eNBs receive sufficient power to ensure reliable connection establishment, while low-priority eNBs may receive reduced power or have transmissions suspended. This local differentiation ensures power constraint compliance while maintaining adequate power for critical communications
Data Source
AI summary
A random access method and an apparatus of a terminal for performing random access procedure to multiple base stations in parallel in a Long Term Evolution (LTE) system supporting dual connectivity are provided. The method includes determining whether a first preamble transmission to a first cell of a first base station is overlapped with a second preamble transmission to a second cell of a second base station in a time domain, determining, when the first preamble transmission is overlapped with the second preamble transmission in the time domain, whether a sum of transmit powers calculated for the first and second preamble transmissions is greater than a maximum allowed transmit power of the terminal, and controlling, when the sum of the first and second preamble transmit powers is greater than the maximum allowed transmit power, the transmit power calculated for the second preamble transmission.