Multi-Band SRS Port Configuration for Accurate DL Channel Estimation
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Solution Overview
Problem
Existing wireless communication systems face challenges in providing accurate DL channel estimation due to insufficient utilization of UL/DL channel reciprocity, particularly in managing SRS transmission for multiple uplink bands.
Innovation Solution
The method involves configuring different SRS ports for each uplink band based on SRS configuration information to provide various frequency domain samples, allowing for delicate DL channel estimation by leveraging UL/DL channel reciprocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single SRS port configuration is used for multiple uplink bands, then device complexity is reduced, but DL channel estimation accuracy deteriorates
Solution Approach 1:
The patent divides the SRS port configuration into separate configurations for each uplink band. Instead of using a single unified SRS port configuration across multiple bands, the system configures different SRS ports specifically for each band, allowing independent optimization of channel estimation for each frequency band while maintaining manageable complexity through structured configuration information.
Solution Approach 2:
The patent applies local quality by tailoring the SRS port configuration to the specific characteristics of each uplink band. Each band receives a customized SRS port configuration that is optimized for its local channel conditions, frequency characteristics, and reciprocity properties, rather than applying a uniform configuration across all bands.
2Measurement precision
If different SRS ports are configured for each uplink band, then DL channel estimation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal SRS configuration framework that can handle multiple uplink bands with different port configurations through a unified configuration information structure. The SRS configuration information is designed to be multi-functional, supporting both single-band and multi-band scenarios, and can accommodate different numbers of SRS ports across bands through standardized parameter fields that work universally across all band configurations.
3Reliability
If SRS transmission is performed for multiple uplink bands, then channel reciprocity utilization is improved, but transmission overhead increases
Solution Approach 1:
The patent applies partial action by selectively configuring SRS transmission only for the necessary number of uplink bands and using an appropriate number of SRS ports for each band based on specific channel estimation requirements. Rather than transmitting SRS across all possible bands with maximum ports, the system performs partial SRS transmission optimized for each band's actual need, reducing overall overhead while maintaining reliability where needed.
Data Source
AI summary
Disclosed is a method for transmitting a sounding reference signal (SRS) for a plurality of uplink bands in a wireless communication system, according to various embodiments. Disclosed are the method and an apparatus therefor, the method comprising the steps of: receiving, from a base station, SRS configuration information for the plurality of uplink bands; and transmitting, to the base station, the SRS in each of the plurality of uplink bands, on the basis of the SRS configuration information. The SRS is transmitted via at least one SRS port allocated to each of the plurality of uplink bands by means of the SRS configuration information, and the at least one SRS port is allocated differently for each of the plurality of uplink bands.