Inter-Cell Interference Control for SRS Transmission in Wireless Systems
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Solution Overview
Problem
In wireless communication systems, inter-cell interference caused by Sounding Reference Signal (SRS) transmission poses challenges in maintaining communication reliability and efficiency, particularly in next-generation communication systems that require enhanced Mobile Broadband, massive Machine Type Communications, and Ultra-Reliable and Low Latency Communication.
Innovation Solution
A method and apparatus for controlling inter-cell interference by a Base Station (BS) that involves receiving information about the physical resource region affected by SRS transmission from a neighboring cell, identifying the User Equipment (UE) and its transmission beam ID, and allocating an SRS or uplink channel with a different transmission beam ID in that region, ensuring efficient resource allocation and interference measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SRS transmission is performed in the same physical resource region in neighboring cells, then uplink channel quality and beamforming performance are improved, but inter-cell interference increases
Solution Approach 1:
The patent applies local quality by differentiating resource allocation at the cell level. Each cell configures SRS transmission resources locally based on its own interference situation and beamforming requirements. The serving base station allocates specific physical resource regions for SRS transmission to UEs, while coordinating with neighboring base stations to avoid simultaneous SRS transmissions in the same time-frequency resources, thereby maintaining high uplink channel quality while reducing inter-cell interference.
Solution Approach 2:
The patent implements dynamic resource allocation where base stations continuously adjust SRS transmission resources based on real-time interference conditions and beamforming needs. The configuration information about physical resource regions is dynamically updated and signaled to UEs, allowing the system to adapt to changing channel conditions and interference patterns, thus maintaining optimal uplink performance while managing interference dynamically.
2Productivity
If SRS resources are allocated in overlapping physical resource regions between serving and neighboring cells, then resource utilization efficiency is improved, but interference coordination complexity increases
Solution Approach 1:
The patent applies preliminary action by having base stations proactively exchange configuration information about SRS physical resource regions with neighboring base stations before actual SRS transmission occurs. This advance coordination allows the system to pre-identify and avoid potential interference situations, enabling efficient resource utilization without requiring complex real-time interference management. The configuration information is signaled to UEs in advance, allowing them to transmit SRS on non-interfering resources.
3Quantity of substance
If SRS transmission uses the same time-frequency resources across cells, then system capacity is improved, but measurement precision of uplink channel deteriorates due to interference
Solution Approach 1:
The patent applies segmentation by dividing the available time-frequency resources into cell-specific SRS transmission regions. Instead of allowing all cells to use the same resources simultaneously, the system segments the resource space so that each cell has dedicated or coordinated resource regions for SRS transmission. This segmentation reduces interference between cells while maintaining overall system capacity, as resources are efficiently partitioned and allocated based on local conditions.
Data Source
AI summary
A method for controlling inter-cell interference due to sounding reference symbol (SRS) transmission of an inter-cell terminal to which a base station belongs by the base station in a wireless communication system can comprise the steps of: receiving, from an adjacent base station, information relating to a physical resource region causing interference in adjacent cells due to SRS transmission of a terminal, identifier information of the terminal and transmission beam identifier information of the terminal; and allocating a different uplink channel or allocating an SRS corresponding to a transmission beam identifier other than the transmission beam identifier of the terminal to the physical resource region of the terminal.