Inter-Cell Interference Coordination Bandwidth Reservation
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Solution Overview
Problem
Wireless communication systems face interference issues due to the introduction of semi-autonomous base stations, which affect bandwidth utilization and user equipment access, particularly in environments with multiple evolved NodeBs (eNBs) and home evolved NodeBs (HeNBs).
Innovation Solution
Implementing methods and apparatus for inter-cell interference coordination (ICIC) by reserving bandwidth, managing transmit power, and using self-organizing networks (SON) to identify and mitigate interference between HeNBs and eNBs, including mechanisms for uplink and downlink ICIC, such as reserving bandwidth, reducing and increasing transmit power, and reporting signal strength to coordinate interference reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If semi-autonomous base stations (HeNBs) are introduced to expand network coverage, then network coverage and capacity are improved, but inter-cell interference increases affecting bandwidth utilization and user equipment access
Solution Approach 1:
The patent segments the bandwidth resource into reserved portions and non-reserved portions. The HeNB reserves specific bandwidth resources for its UEs, and this reservation information is shared with neighboring eNBs through X2 interface signaling. This segmentation allows the HeNB to provide enhanced coverage while preventing interference to eNB communications by ensuring that reserved resources are not used by interfering cells.
Solution Approach 2:
The patent implements preliminary action by having the HeNB proactively reserve bandwidth resources and notify neighboring eNBs before interference occurs. The reservation is established in advance, and the X2 interface signaling pre-configures the neighboring eNBs to avoid using these reserved resources, thereby preventing inter-cell interference before it affects network performance.
2Reliability
If bandwidth is reserved for HeNB-UE communication, then HeNB coverage and access reliability are improved, but available bandwidth for eNB-UE communication is reduced
Solution Approach 1:
The patent applies local quality by making the bandwidth reservation local to specific HeNB cells rather than globally across the entire network. Each HeNB independently reserves bandwidth resources based on its local coverage needs and interference conditions. The X2 interface signaling ensures that only neighboring eNBs are aware of and constrained by these local reservations, allowing other parts of the network to utilize the full bandwidth spectrum.
3Object-affected harmful factors
If transmit power is reduced to mitigate interference, then inter-cell interference is decreased, but signal strength and coverage area are reduced
Solution Approach 1:
The patent implements dynamics by enabling dynamic adjustability of transmit power levels based on real-time interference conditions and UE requirements. The system can dynamically switch between different power levels and bandwidth reservation configurations, allowing the HeNB to maintain adequate coverage while mitigating interference when necessary. This dynamic approach is supported by ongoing signaling through the X2 interface to coordinate power and resource allocation with neighboring cells.
Data Source
AI summary
A method for inter-cell interference coordination (ICIC) by a home evolved NodeB (HeNB) is described. A portion of bandwidth is reserved for a user equipment (UE). Notification of the reserved portion of bandwidth is sent to at least one potentially interfering evolved NodeB (eNB). A data exchange is performed with the UE using the reserved portion of bandwidth. Notification is sent to the potentially interfering eNBs releasing the reserved portion of bandwidth.