Inter-Cell Interference Coordination via OTA Load Indication
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Solution Overview
Problem
Wireless communication systems, particularly LTE systems, face challenges in managing inter-cell interference due to heterogeneous network characteristics, leading to coverage dead spots and inefficient bandwidth utilization, especially with the increasing deployment of mobile stations and semiautonomous base stations like femtocells.
Innovation Solution
The method involves providing Over the Air (OTA) load indication and Relative Narrowband Transmit Power (RNTP) information to facilitate inter-cell interference coordination (ICIC) by determining interference values, comparing them to target values, and communicating load indicators to neighboring cells, which allows for dynamic scheduling and resource partitioning between serving and neighboring cells to mitigate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If heterogeneous network characteristics are deployed to increase network capacity and coverage, then network deployment flexibility and capacity are improved, but inter-cell interference and coverage dead spots increase
Solution Approach 1:
The patent implements feedback mechanisms where base stations exchange load indication (LI) and relative narrowband transmit power (RNTP) information with neighboring cells. This feedback enables dynamic adjustment of transmit power and resource allocation to mitigate inter-cell interference while maintaining heterogeneous network deployment flexibility.
Solution Approach 2:
The patent dynamically changes transmission parameters including narrowband transmit power levels and resource block allocations based on real-time interference conditions. By adjusting these parameters in response to LI and RNTP information, the system resolves interference issues while preserving network adaptability.
2Quantity of substance
If more mobile stations and semiautonomous base stations are deployed to increase system capacity, then network capacity and coverage are improved, but bandwidth utilization efficiency and interference management become more difficult
Solution Approach 1:
The patent employs dynamic parameter adjustment where base stations modify transmit power levels and resource allocations based on interference conditions. This automated parameter adaptation simplifies interference management in high-capacity networks by removing the need for manual configuration.
Solution Approach 2:
The patent enables base stations to autonomously manage interference through self-service mechanisms. Each base station independently processes LI and RNTP information from neighbors and automatically adjusts its own transmission parameters, reducing overall system management complexity despite increased network capacity.
3Area of stationary object
If deep penetration of physical channels is used to overcome coverage dead spots, then coverage is improved, but unwanted interference between nodes and equipment increases
Solution Approach 1:
The patent applies local quality optimization by adjusting transmit power and resource allocation specifically in affected narrowbands and cells. Rather than uniform power reduction, the system applies targeted power control and resource partitioning to areas experiencing interference, maintaining coverage while reducing unwanted interference.
Solution Approach 2:
The patent dynamically changes transmission parameters including power spectral density and resource block assignments in response to interference conditions. This enables the system to maintain deep penetration coverage in critical areas while reducing interference in other regions through parameter adaptation.
Data Source
AI summary
Systems and methods for facilitating inter-cell interference coordination using resource partitioning are described. A UE may receive or determine information related to received interference and/or future scheduling. The information may be communicated to a serving base station, which may use the information to allocate uplink or downlink resources between cells. The uplink and/or downlink resource may be partitioned in subbands to mitigate interference from adjacent network nodes. The eNBs may communicate, such as directly, via a backhaul connection, and/or between UEs to configure interference coordination and signaling.