Directional Antennas in Mobile Ad Hoc Networks
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Solution Overview
Problem
Conventional mobile wireless ad hoc networks are vulnerable to jamming due to the use of omni-directional reception and limited directional transmission, which affects network security and performance.
Innovation Solution
Implementing high-gain, directional antennas for both transmission and reception, with a time multiplex frame structure divided into sub-frames for node discovery, reservation, and data transmission, allowing for directional communication and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If omni-directional reception is used in mobile wireless ad hoc networks, then the network can receive signals from all directions, but the network becomes vulnerable to jamming and has limited transmission range
Solution Approach 1:
The patent segments the time domain into distinct sub-frames: discovery sub-frames for omni-directional node detection, and data transmission sub-frames for directional communication. This temporal segmentation allows the system to switch between reception modes, achieving both broad coverage during discovery and secure directional transmission during data exchange, thereby resolving the contradiction between reception versatility and jamming susceptibility
Solution Approach 2:
The patent implements dynamic antenna beamforming that adapts the reception pattern based on the operational phase. During discovery sub-frames, the antenna operates in omni-directional mode to detect all neighboring nodes. During data transmission sub-frames, the antenna dynamically switches to directional beamforming aligned with the communication partner, providing both comprehensive coverage and targeted security as needed
2Speed
If directional antennas are used for transmission, then transmission range and data rate are improved, but reception distance is limited when using omni-directional antennas
Solution Approach 1:
The patent merges directional transmission capabilities with directional reception capabilities by implementing bidirectional beamforming. Both transmitting and receiving nodes employ directional antennas and coordinate their beamforming patterns to establish mutual directional links. This combination allows the system to achieve extended reception distance through directional gain while maintaining high data rates, resolving the contradiction between transmission performance and reception range
3Area of stationary object
If omni-directional antennas are used for communication, then coverage is maximized, but signal dispersion reduces transmission efficiency
Solution Approach 1:
The patent implements periodic switching between omni-directional and directional modes through the time multiplex frame structure. Discovery sub-frames use omni-directional transmission periodically to maintain coverage awareness, while data transmission sub-frames use directional beamforming periodically to maximize transmission efficiency. This periodic alternation ensures both coverage and efficiency are achieved at appropriate intervals
Data Source
AI summary
Directional transmission and reception in mobile wireless ad hoc networks may include a number of nodes, in which there is at least a first node and a second node. Each node is associated with a time multiplex frame structure having multiple sub-frames. The sub-frames includes at least a first sub-frame, a second sub-frame, and a third sub-frame. Each of the sub-frames includes multiple time slots. The network further includes one or more directional antennas associated with each of the nodes. The first node of the network is configured to establish communication with the second node within one or more time slots corresponding to the first sub-frame in the time multiplex structure. The first node is also configured to reserve one or more time slots for data transmission with the second node within one or more time slots corresponding to the second sub-frame in the time multiplex structure. The first node is further configured to transmit data to the second node based on the one or more reserved time slots corresponding to the third sub-frame in the time multiplex structure. Other embodiments of this aspect include corresponding techniques, apparatus, and computer program products.