Small Base Station Victim Terminal Detection in Heterogeneous Networks
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Solution Overview
Problem
In heterogeneous cell environments, small base stations face challenges in accurately detecting macro terminals due to sensing errors caused by energy detectors, which can lead to inefficient resource utilization and interference with macro users.
Innovation Solution
The method involves using a silence resource corresponding to an uplink resource allocated to the macro terminal to enhance detection performance, sharing information associated with the uplink signal between small and macro base stations, and performing channel sensing based on correlation with multi-path channels to improve accuracy and reliability of energy detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an energy detector is used to sense macro users, then the small base station can detect macro users without cooperation, but sensing errors occur leading to deteriorated resource utilization efficiency and interference against macro users
Solution Approach 1:
The patent introduces silence resources as an intermediary mechanism to facilitate accurate detection of macro users. By allocating specific time-frequency resources where macro users do not transmit, the small base station can listen to the channel without interference, enabling accurate detection of macro user presence through the absence of signals during these silence periods
Solution Approach 2:
The patent implements preliminary action by pre-configuring silence resources before detection occurs. The macro base station预先 allocates silence resources to macro users, ensuring that when the small base station needs to detect macro users, the channel is guaranteed to be clear of macro user transmissions during these predetermined time-frequency slots
2Measurement precision
If silence resources are allocated for victim terminal detection, then detection performance is enhanced, but system resources are consumed
Solution Approach 1:
The patent applies universality by designing silence resources that serve multiple functions simultaneously: they enable victim terminal detection for small base stations, provide channel quality information for resource allocation optimization, and facilitate interference coordination between macro and small cells. This multi-functionality maximizes the utility of the allocated silence resources
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting the time-frequency allocation of silence resources based on network conditions, traffic patterns, and detection requirements. The duration, frequency position, and periodicity of silence resources can be modified to optimize the balance between detection performance and resource efficiency
Data Source
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AI summary
Provided is a method, and an apparatus and communication system to perform the method, of detecting a victim terminal and performing an interference coordination in a multi-cell environment. The multi-cell environment may include a heterogeneous cell environment including a small cell and a macro cell. The method includes determining whether a macro terminal is located within a cell coverage of a small base station, and adjusting the cell coverage according to the determination.