Linear Cellular Node with Directional Antennas for Interference Reduction
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Solution Overview
Problem
Conventional one-dimensional cellular networks face limitations in data capacity and interference issues due to the use of omnidirectional antennas and traditional frequency reuse schemes, which restrict the amount of data that can be communicated and affect user terminal experience.
Innovation Solution
The implementation of a node with two directional antennas, each covering one side of the node, allowing for independent communication in the same channel resource while broadcasting a single cell-ID, and employing different power levels for channel resources to reduce interference and increase capacity, effectively doubling the data throughput without requiring changes to user terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If omnidirectional antennas are used for communication in both directions, then coverage area is improved, but interference from neighbouring nodes increases and data capacity is limited
Solution Approach 1:
The node is divided into two separate directional antennas, each responsible for one direction (left and right). This segmentation allows each antenna to focus its coverage in a specific direction, reducing interference from neighboring nodes while maintaining comprehensive coverage through coordinated operation of both antennas.
Solution Approach 2:
The solution transitions from a single omnidirectional antenna covering 360 degrees in all directions to two directional antennas each covering 180 degrees in opposite directions. This dimensional change in antenna orientation enables selective coverage and reduces interference by limiting the angular spread of each transmission.
2Productivity
If frequency reuse schemes are employed to increase network capacity, then data throughput is improved, but signal-to-interference ratio deteriorates
Solution Approach 1:
Different power levels are assigned to different channel resources (CR1-CR6) depending on the direction and distance of user terminals. This local quality differentiation allows frequency reuse to occur in directions where interference is minimal, while maintaining higher power levels only where needed, thus improving throughput without sacrificing signal-to-interference ratio.
Solution Approach 2:
The system dynamically changes power levels for different channel resources based on user terminal position and direction. By adjusting the power parameter selectively for each channel resource and direction, the system can reuse frequencies more aggressively in certain directions while maintaining signal quality, thereby increasing overall data throughput without degrading the signal-to-interference ratio.
3Object-generated harmful factors
If different power levels are used for different channel resources, then interference is reduced, but device complexity increases
Solution Approach 1:
The node uses identical hardware components (two directional antennas, transceiver, controller) that can operate in multiple modes. The same hardware infrastructure supports both directional communication and dynamic power level adjustment for different channel resources, achieving interference reduction without proportionally increasing device complexity through multi-functional use of existing components.
4Productivity
If two directional antennas are deployed for independent communication, then data capacity is doubled, but manufacturing and deployment complexity increases
Solution Approach 1:
The system employs two directional antennas with asymmetric orientation (one facing left, one facing right) to achieve symmetric bidirectional communication capability. This asymmetric configuration allows each antenna to be optimized for its specific direction while collectively providing full coverage, simplifying manufacturing compared to attempting to create a single omnidirectional antenna with equivalent performance.
Data Source
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AI summary
The invention relates to a node (11) for a cellular network (1) with a linear cell topology, wherein the node (11) is configured to communicate data (3) in at least a first and a second channel resource (CRi) of a communication channel (CH) and to employ different power levels (P1, P2) for different channel resources (CRi), wherein the node (11) comprises a first and a second directional antenna (12, 13), each directed in a different direction, and wherein the node (11) is further configured to independently communicate different data (3) over the first and the second antenna (12, 13) in the same channel resource (CRi). The invention further relates to a cellular network (1) comprising a plurality of nodes (11) and a method for communicating between a user terminal (4) and a node (11).