Uplink Power Control for Reduced Functionality TRP
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing uplink transmission to transmission and reception points with reduced functionality, particularly in evolving 5G networks.
Innovation Solution
The method involves receiving a Physical Downlink Control Channel (PDCCH) order from a Transmission/Reception Point (TRP) with specific functionality indications, and performing a Physical Random Access Channel (PRACH) transmission based on these indications, with the transmit power determined by the field in the PDCCH order.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If uplink transmission is performed to TRP with reduced functionality, then network coverage and connectivity are improved, but transmission reliability and power control accuracy deteriorate
Solution Approach 1:
The patent introduces a field in the PDCCH order as an intermediary mechanism to convey TRP functionality information to the UE. This field acts as a mediator that enables the UE to identify whether the target TRP has full or reduced functionality, allowing appropriate power control to be applied without requiring direct UE knowledge of TRP capabilities. The intermediary field resolves the contradiction by providing reliable power control information to UEs targeting reduced functionality TRPs, thereby maintaining transmission reliability while expanding network coverage.
2Device complexity
If power control is simplified for reduced functionality TRP, then device complexity is reduced, but power allocation precision deteriorates
Solution Approach 1:
The patent applies local quality by introducing a specific field in the PDCCH order that is only present and applicable when the target TRP has reduced functionality. This localized modification to the power control mechanism provides precise power allocation information only where needed (for reduced functionality TRPs), while maintaining the simplicity of the overall power control procedure for full functionality TRPs. The local quality approach resolves the contradiction by enabling precise power allocation for reduced functionality TRPs without increasing complexity across the entire system.
3Loss of energy
If TRP functionality is reduced, then system resource consumption is reduced, but uplink transmission performance deteriorates
Solution Approach 1:
The patent changes the parameter of power control by introducing a new field in the PDCCH order that carries power control information specifically for reduced functionality TRPs. This parameter change enables the system to maintain accurate power allocation even when TRP functionality is reduced, thereby preserving uplink transmission performance. The parameter change allows the system to efficiently manage resources by providing power control information only when and where needed, resolving the contradiction between reduced resource consumption and maintained transmission performance.
Data Source
AI summary
Methods, systems, and apparatuses are provided for uplink transmission to transmission and reception point with reduced functionality in a wireless communication system, wherein a method comprises receiving a Physical Downlink Control Channel (PDCCH) order from a first Transmission/Reception Point (TRP) of a serving cell, wherein a field in the PDCCH order indicates an association between a Physical Random Access Channel (PRACH) transmission and the first TRP with Downlink (DL) and Uplink (UL) functionality or an association between the PRACH transmission and a second TRP, of the serving cell, without DL functionality or with reduced DL functionality, and performing the PRACH transmission in response to the PDCCH order, wherein a transmit power of the PRACH transmission is determined based on the field.