Uplink Power Prioritization for Short TTI Control
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Solution Overview
Problem
In LTE networks, wireless devices face challenges in distributing uplink power among parallel transmission channels, especially when they have insufficient power for all channels, particularly for short transmission time intervals (sTTIs) which require prioritization to minimize latency and ensure timely transmission of control information.
Innovation Solution
Implementing prioritization rules to distribute power among uplink physical channels, prioritizing sTTI transmissions containing control information over those without, and allocating power based on transmission duration, ensuring sufficient power for sTTIs to minimize delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If uplink power is distributed among multiple parallel transmission channels, then power utilization efficiency improves, but transmission reliability deteriorates when total power is insufficient
Solution Approach 1:
The patent applies local quality by differentiating power allocation strategies for different transmission channels based on their specific characteristics. Control information channels receive prioritized power allocation to ensure reliable delivery of critical data, while data channels receive remaining power. This localized differentiation of power quality ensures that the most important transmissions maintain reliability even when total power is limited.
Solution Approach 2:
The patent changes the power allocation parameter dynamically based on transmission type. By introducing a prioritization mechanism that assigns different power levels to control information versus data transmissions, the system adapts power distribution to match the criticality of each transmission, thereby maintaining overall transmission reliability while efficiently utilizing limited power resources.
2Loss of time
If short TTI transmissions are prioritized over regular TTI transmissions, then latency is reduced, but power consumption increases
Solution Approach 1:
The patent implements preliminary action by pre-establishing power allocation rules that prioritize control information transmissions before data transmissions. This advance planning ensures that when short TTI transmissions occur, the necessary power is already allocated and ready, enabling low-latency transmission without ad-hoc power increases. The prioritization framework is set up in advance to handle time-critical transmissions efficiently.
3Speed
If power is allocated to ensure timely delivery of control information, then system responsiveness improves, but available power for data transmission decreases
Solution Approach 1:
The patent applies local quality by allocating different power levels to different transmission types within the same uplink transmission. Control information channels receive higher power priority to ensure timely delivery and improve system responsiveness, while data channels receive the remaining power. This localized power quality differentiation allows the system to enhance responsiveness for critical transmissions without completely depleting power for data transmission.
Solution Approach 2:
The patent implements partial action by allocating power preferentially to control information when power is limited, rather than attempting to provide equal power to all transmissions. This partial prioritization ensures that the most critical transmissions (control information) receive sufficient power for timely delivery, while data transmissions receive whatever remaining power is available, achieving a balanced compromise between responsiveness and data transmission capacity.
Data Source
AI summary
Certain embodiments relate to a method for use in a wireless device. The method comprises distributing uplink power among parallel transmissions that the wireless device has scheduled during a subframe on two or more uplink physical channels. The parallel transmissions comprise one or more short transmission time interval, sTTI, transmissions, and the UL power is distributed according to at least one prioritization rule. According to one of the prioritization rules, sTTI transmissions comprising control information are prioritized over sTTI transmissions comprising data without any control information. According to another of the prioritization rules, transmissions with shorter transmission time intervals are prioritized over transmissions with longer transmission time intervals.