SRS Resource Allocation in Full Duplex Radio Systems
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G, face challenges in reducing data request delay and efficiently utilizing resources for full duplex radio (FDR) technology, which requires simultaneous transmission and reception, leading to idle time in uplink resources that are not effectively utilized.
Innovation Solution
A method for transmitting and receiving sounding reference signals (SRS) in FDR mode, where the base station configures resource regions within uplink idle intervals for SRS transmission, allowing for uplink and downlink channel estimations using channel reciprocity, enabling efficient data scheduling and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex radio (FDR) technology is used to simultaneously perform transmission and reception in the same time/frequency resources, then system capacity is doubled, but uplink idle time is created that is not effectively utilized
Solution Approach 1:
The patent enables the system to utilize its own idle uplink resources by having the base station transmit SRS configuration information during uplink idle intervals, allowing the base station to perform channel estimation using uplink SRS transmissions from user equipment, thereby converting previously wasted idle time into productive channel estimation opportunities
Solution Approach 2:
The patent makes the uplink idle interval serve multiple functions: it maintains the full duplex operation while simultaneously providing resources for SRS transmission and channel estimation, transforming a single-purpose resource (downlink transmission only) into a multi-functional resource that supports both data transmission and channel characterization
2Measurement precision
If uplink idle intervals are used for SRS transmission, then channel estimation accuracy is improved, but resource configuration complexity increases
Solution Approach 1:
The patent changes the timing parameters of SRS transmission by configuring specific subframe offsets and symbol positions within the uplink idle interval, allowing flexible adjustment of channel estimation timing to match different service requirements while maintaining systematic resource allocation through standardized parameter sets
3Loss of time
If data request delay is reduced to 1 ms for 5G applications, then real-time control performance is improved, but system resource allocation complexity increases
Solution Approach 1:
The patent performs channel estimation in advance during uplink idle intervals using SRS transmissions, so that channel state information is ready before downlink data transmission is needed, enabling rapid 1 ms data request response without requiring complex real-time resource allocation by pre-preparing channel knowledge
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances communication efficiency by effectively utilizing uplink idle time, reducing data request delay, and improving system capacity by allowing simultaneous data transmission and reception, aligning with the requirements of 5G technology for lower latency and increased throughput.
Implementation Method 1
transmitting information related to a resource region for the SRS transmission to a user equipment of the FDR mode
Implementation Method 2
performing an uplink (UL) channel estimation based on the received SRS
Implementation Method 3
performing a downlink (DL) channel estimation by applying a channel reciprocity characteristic to a result of the uplink (UL) channel estimation
Data Source
AI summary
A method for transmitting information related to a sounding reference signal (SRS) transmission by a base station (BS) of a full duplex radio (FDR) mode in a wireless communication system includes: transmitting information related to a resource region to be used for the SRS transmission to a user equipment of the FDR mode within a resource region configured as an uplink (UL) idle interval; receiving a SRS through the resource region for the SRS transmission from the user equipment; performing an uplink (UL) channel estimation based on the received SRS; and performing a downlink (DL) channel estimation by applying a channel reciprocity characteristic to a result of the uplink (UL) channel estimation.