Combined PUSCH Power Control via Command Merging
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Solution Overview
Problem
Current wireless communication systems lack a solution for simultaneously power controlling both dynamically and persistently scheduled Physical Uplink Shared Channels (PUSCH) when both are active, leading to inefficiencies in power management.
Innovation Solution
A power control scheme that combines accumulation and absolute commands from both the UL scheduling grant and TPC-PDCCH for dynamically and persistently scheduled PUSCH, using a generalized power control formula to adjust transmit power, allowing for simultaneous power control of both types of PUSCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate power control procedures are used for dynamically scheduled PUSCH and persistently scheduled PUSCH, then each can be controlled independently, but the system cannot simultaneously power control both when both are active
Solution Approach 1:
The patent merges the separate power control procedures for dynamically scheduled PUSCH and persistently scheduled PUSCH into a unified power control framework. The base station generates a single power control command that is applied to both PUSCH types, and the WTRU accumulates commands from both UL scheduling grants and TPC-PDCCH to determine transmit power for combined PUSCH transmissions, resolving the contradiction by enabling simultaneous control without requiring separate independent procedures
Solution Approach 2:
The patent creates a universal power control mechanism that handles both dynamically scheduled and persistently scheduled PUSCH through a common accumulation function. The same power control formula and accumulation logic are used regardless of PUSCH type, allowing the system to universally control multiple PUSCH types with a single standardized procedure rather than requiring type-specific control mechanisms
2Productivity
If a unified power control formula is used for combined PUSCH, then power management becomes efficient, but the complexity of handling accumulation and absolute commands increases
Solution Approach 1:
The patent implements a dynamic power control accumulation function that adapts its behavior based on the type of command received. When an absolute command is received, the accumulation is reset; when a relative command is received, the accumulation continues. This dynamic adjustment of the accumulation state based on command type allows efficient unified power control while systematically managing the complexity through well-defined state transition rules
Solution Approach 2:
The patent employs feedback mechanisms where the WTRU monitors both UL scheduling grants and TPC-PDCCH for power control commands, accumulates them according to defined rules, and adjusts transmit power accordingly. The base station receives feedback about PUSCH transmission quality and sends adjusted power control commands in subsequent transmissions, creating a closed-loop system that efficiently manages power while handling command complexity through systematic feedback processing
Data Source
AI summary
A power control scheme for an enhanced Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access (E-UTRA) physical uplink shared channel (PUSCH) is disclosed. In a first embodiment, when an uplink grant is configured for accumulation commands, the wireless transmit/receive unit (WTRU) combines the accumulation commands received in both the scheduling grant and the transmit power control physical downlink control channel. In a second embodiment, when an uplink grant is configured for absolute commands, the WTRU resets the accumulation control function immediately after receiving each absolute transmit power control command and then combines the absolute power control with the accumulation power control.