NCB-Based PUSCH Uplink Using Selectable SRS Resources
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately estimating uplink channel conditions due to limitations in channel measurement and parameter selection, particularly in 5G and beyond networks, which affect data transmission efficiency.
Innovation Solution
Implementing a method and apparatus for uplink transmission that involves a user equipment (UE) transmitting UE capability information about antenna ports and non-codebook-based physical uplink shared channel (PUSCH) resources, and a base station (BS) configuring and selecting SRS resources for efficient PUSCH transmission, with each SRS resource comprising one port and a defined maximum number of layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of SRS resources is increased to support more antenna ports (P>4), then the uplink channel estimation accuracy is improved, but the signaling overhead and system complexity increase
Solution Approach 1:
The patent segments the SRS resource configuration by introducing a maximum layer parameter (Lmax) that divides the relationship between antenna ports and SRS resources. This segmentation allows the system to handle P>4 antenna ports by configuring NSRS SRS resources where each resource comprises one SRS port, with the constraint 1≤NSRS≤P and 1≤k≤Lmax, thereby managing complexity through structured division
Solution Approach 2:
The patent introduces new parameters (NSRS, Lmax, k) to change the configuration space of SRS resources. By defining Lmax as the maximum value of layers for NCB-based PUSCH transmission and configuring the selection of k out of NSRS SRS resources, the system adapts to P>4 antenna ports while maintaining controlled complexity through parameter-based management
2Productivity
If non-codebook-based PUSCH transmission is enabled for UEs with P>4 antenna ports, then the uplink data transmission efficiency is improved, but the configuration and resource management complexity increases
Solution Approach 1:
The patent applies preliminary action by having the UE transmit capability information about NCB-based PUSCH transmission and antenna ports before actual data transmission. The BS then pre-configures NSRS SRS resources and provides indications for selecting k resources, preparing the system in advance to enable efficient NCB-based PUSCH transmission without ad-hoc complexity during data transmission
Solution Approach 2:
The patent creates a universal configuration framework that handles both codebook-based and non-codebook-based PUSCH transmission through a unified SRS resource management approach. The same SRS resource configuration mechanism (with NSRS, Lmax, and k parameters) serves multiple transmission modes, reducing the need for separate configuration systems
Data Source
AI summary
Methods and apparatuses for uplink (UL) transmission are disclosed. The method comprises transmitting a UE capability information including information about (i) a number of antenna ports P>4, and (ii) transmission of a non-codebook-based (NCB-based) physical uplink shared channel (PUSCH); receiving a configuration about NSRS sounding reference signal (SRS) resources for transmission of the NCB-based PUSCH; transmitting the NSRS SRS resources; receiving an indication indicating a selection of k out of NSRS SRS resources; and transmitting the NCB-based PUSCH based on the k SRS resources, wherein: each SRS resource comprises one SRS port, a maximum value of a number of layers (Lmax) for the NCB-based PUSCH transmission is configured, 1≤NSRS≤P, 1≤k≤NSRS, and 1≤k≤Lmax.