Spatial LBT with Broadcast Reception for Wireless Interference
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Solution Overview
Problem
In wireless communication networks, interference from neighboring base stations and other transmitters degrades performance, especially as demand for mobile broadband access increases, leading to congested networks and inefficiencies in medium-sensing procedures for shared spectrum access.
Innovation Solution
Implementing spatial listen before talk (LBT) with broadcast/multicast reception techniques, where potential interfering nodes detect preambles to identify transmission locations and refrain from transmitting during broadcast/multicast periods, using orthogonal beams to minimize interference and optimize data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional medium-sensing procedures are used for shared spectrum access, then network coverage and basic communication are maintained, but network congestion increases and communication efficiency deteriorates as demand for mobile broadband access grows
Solution Approach 1:
The patent segments the medium access procedure into multiple components: broadcast CTS signals for announcing reception opportunities, preambles for identifying transmission locations, and spatial LBT for interference detection. This segmentation allows different nodes to perform specialized functions, improving overall network efficiency and reducing congestion compared to traditional omnidirectional LBT
Solution Approach 2:
The patent introduces spatial dimension to traditional LBT by implementing directional beamforming and spatial LBT. Instead of omnidirectional sensing, nodes transmit and sense signals in specific spatial directions using beamforming technology. This dimensional change allows multiple nodes to access the medium simultaneously in different spatial directions, increasing network capacity and reducing congestion
2Productivity
If nodes transmit data continuously to maximize utilization, then medium utilization improves, but interference from neighboring transmitters increases and degrades communication quality
Solution Approach 1:
The patent applies local quality by implementing directional beamforming where each node transmits signals in specific spatial directions rather than omnidirectionally. This creates localized transmission zones with controlled interference patterns, allowing high medium utilization while maintaining communication quality through spatial isolation of transmissions
Solution Approach 2:
The patent implements feedback mechanisms where receiving nodes send broadcast CTS signals to acknowledge successful reception and inform potential interferers. This feedback loop allows transmitting nodes to adjust their spatial LBT parameters and beamforming directions dynamically, maximizing medium utilization while preventing harmful interference through real-time adaptation
3Productivity
If spatial LBT with broadcast/multicast reception is implemented, then interference is reduced and communication efficiency improves, but device complexity increases due to orthogonal beam determination and preamble detection
Solution Approach 1:
The patent applies preliminary action by having receiving nodes pre-announce their reception opportunities through broadcast CTS signals before actual data transmission. This allows potential interfering nodes to detect these advance notifications and perform spatial LBT in preparation, reducing actual transmission interference while managing complexity through proactive coordination
Solution Approach 2:
The patent introduces preambles as intermediary signals that carry information about transmission locations and parameters. These preambles serve as mediators between transmitting and receiving nodes, enabling automated spatial LBT and orthogonal beam determination without requiring complex real-time negotiation, thus improving communication efficiency while controlling device complexity
Data Source
AI summary
Spatial listen before talk (LBT) with broadcasting or multicasting reception is disclosed. Aspects of the disclosure provide for managing spatial LBT transmissions between broadcast communication nodes and neighboring cells. In one aspect, the broadcast transmitter transmits a preamble that identifies the broadcast transmission durations and the non-broadcast durations in the upcoming transmit opportunity. The potential interferer would read the preamble and yield any transmissions during the broadcast durations. Additional aspects provide for a periodic broadcast clear-to-send (CTS) signal transmitted by the broadcast receivers. The interferer may use the broadcast CTS to perform spatial LBT during the broadcast durations. Further aspects allow the broadcast receivers to determine when potential interferers would cause interference above a threshold. In such circumstances, the broadcast receivers would send the CTS to allow the interferer to perform spatial LBT during the broadcast durations.