Uplink Power Control for Spatial Multiplexing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing power for spatial multiplexing of uplink channels, particularly when multiple channels need to be transmitted contemporaneously, as the total scheduled transmit power often exceeds the maximum transmit power of user equipment (UE), leading to inefficiencies and the need for rescheduling, which consumes resources and causes delays.
Innovation Solution
A method and apparatus for determining a respective transmit power for multiple uplink communications based on priority rules and power reduction strategies, allowing the UE to allocate power effectively across channels scheduled to overlap on the same resource block, ensuring that the total transmit power does not exceed the maximum allowed, while prioritizing critical communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple uplink channels are transmitted contemporaneously via different antennas, then spatial multiplexing efficiency is improved, but total transmit power exceeds maximum allowed power
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting transmit power levels based on channel priority. Different uplink channels (e.g., PUCCH, PUSCH, PRACH) are assigned different power parameters according to their priority, allowing the system to maintain spatial multiplexing while ensuring critical channels receive sufficient power within the maximum power constraint.
Solution Approach 2:
The patent implements local quality by applying different power allocation strategies to different channels based on their specific requirements. High-priority channels like PUCCH carrying uplink control information receive preferential power allocation, while lower-priority channels receive remaining power, ensuring that each channel's quality matches its importance.
2Productivity
If total transmit power is reduced to meet maximum power constraints, then power allocation efficiency is improved, but transmission reliability of critical channels deteriorates
Solution Approach 1:
The patent changes power parameters dynamically based on channel priority. When power reduction is needed, the system identifies high-priority channels (e.g., PUCCH with uplink control information) and allocates sufficient power to them first, then distributes remaining power to lower-priority channels, maintaining both power efficiency and critical channel reliability.
Solution Approach 2:
The patent applies different power quality levels to different channels locally. Critical channels receive higher power quality guarantees through priority-based allocation, ensuring their transmission reliability is maintained even when overall power is reduced, while non-critical channels accept lower power quality.
3Power
If rescheduling is performed to resolve power conflicts, then power constraint compliance is improved, but transmission delay increases
Solution Approach 1:
The patent applies preliminary action by determining power allocation before transmission based on pre-defined priority rules. The UE calculates and allocates power to each channel in advance according to their priorities (PUCCH > PUSCH > PRACH), ensuring power constraints are met without needing post-scheduling adjustments or rescheduling, thus avoiding transmission delays.
Solution Approach 2:
The patent implements self-service through autonomous power allocation at the UE. The user equipment automatically determines and adjusts power distribution among channels based on their priorities and the maximum power constraint, without requiring network intervention or rescheduling commands, thereby eliminating the time loss associated with rescheduling procedures.
4Reliability
If priority-based power allocation is implemented, then transmission reliability of critical channels is improved, but system complexity increases
Solution Approach 1:
The patent manages complexity by using a straightforward parameter-based priority system. Each channel type (PUCCH, PUSCH, PRACH) is assigned a fixed priority level, and power allocation follows a simple hierarchical rule: allocate power to highest priority channels first, then distribute remaining power to lower priority channels. This simple parameter-based approach ensures reliability without excessive complexity.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may determine that multiple uplink channels are to be transmitted contemporaneously via different antennas on a component carrier. The user equipment may determine a respective transmit power for multiple uplink communications associated with the multiple uplink channels based at least in part on a set of priority rules that identifies a respective priority for the multiple uplink communications. The user equipment may transmit the multiple uplink communications using the respective transmit power. Numerous other aspects are provided.