Inter-operator Spectrum Handshaking for Small Cell Interference
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Solution Overview
Problem
Current methods for licensed band spectrum sharing lack inter-operator spectrum handshaking, which hinders efficient spectrum utilization and interference mitigation between macro and small cells, especially in heterogeneous networks, where increasing cell densification alone is insufficient to meet growing data demands.
Innovation Solution
A method and apparatus for inter-operator spectrum handshaking that involves a second network operator requesting and synchronizing the use of muted sub-frames from a first network operator's macro cells, allowing non-overlapping and efficient spectrum sharing between small cells of both operators, utilizing detailed signaling for synchronization and configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cell densification is increased to meet growing data demands, then network capacity is improved, but interference between macro and small cells increases
Solution Approach 1:
The patent segments the time domain by introducing muted sub-frames where macro cells refrain from transmitting in specific time slots. This allows small cells to access spectrum resources without interference from macro cells during these muted periods, thereby increasing network capacity while controlling interference through temporal segmentation.
Solution Approach 2:
The patent implements periodic muted sub-frames where macro cells alternately mute their transmissions in specific time slots. This periodic action creates opportunities for small cells to transmit without interference, enabling dynamic spectrum sharing that increases overall network capacity while managing interference through time-division multiplexing.
2Productivity
If spectrum sharing between operators is enabled, then spectrum efficiency is improved, but coordination complexity increases
Solution Approach 1:
The patent makes the muted sub-frame mechanism universal by allowing any operator's small cells to utilize muted sub-frames from any operator's macro cells. This multi-functional approach enables cross-operator spectrum sharing where the same muted sub-frame structure serves multiple operators and deployment scenarios, improving spectrum efficiency while limiting coordination complexity through standardized procedures.
Solution Approach 2:
The patent introduces a signaling mechanism as an intermediary between operators to coordinate spectrum sharing. The first network operator signals the muted sub-frame configuration to the second network operator, which then configures its small cells accordingly. This intermediary signaling approach enables coordinated spectrum sharing between operators while managing complexity through standardized information exchange protocols.
3Object-affected harmful factors
If detailed signaling for synchronization is implemented, then interference mitigation is improved, but signaling overhead increases
Solution Approach 1:
The patent applies partial synchronization by implementing detailed signaling and synchronization procedures only for the muted sub-frames where interference mitigation is critical, rather than requiring full synchronization across all time slots. This partial action approach improves interference mitigation for the shared spectrum resources while reducing overall signaling overhead by avoiding unnecessary synchronization for non-muted sub-frames.
Data Source
AI summary
The exemplary embodiments include at least a method and apparatus sending by a second network operator a request to use sub-frames muted by macro cells of a first network operator for use by at least one small cell of the second network operator; receiving information for the use of the muted sub-frames; synchronizing a use of the muted sub-frames; and sending an indication of the synchronized use. In addition, a method and apparatus receiving by a first network operator a request to use sub-frames muted by macro cells of the first network operator for use by at least one small cell of a second network operator; sending information for the use of the muted sub-frames; and receiving an indication of the synchronized use of the muted sub-frames.