mmWave Small Cell Detection via Periodic Sector Sweeps
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Solution Overview
Problem
Millimeter-wave (mmWave) capable small cell detection in wireless networks faces challenges due to the directional nature of sync signals and dense deployments, leading to high power consumption and latency issues in device discovery.
Innovation Solution
Implementing a system with RF transceivers and antennas in mobile devices to receive ISS monitoring instructions, scan for directional sync signals, and report detected mmWave boosters, while mmWave anchors manage sector sweeps and beamforming to optimize small cell discovery and connection establishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the mobile device scans the mmWave band on a virtually continuous basis to maintain low latency for MCSC detection, then the detection latency is reduced, but the power consumption increases rapidly
Solution Approach 1:
The patent implements periodic scanning intervals instead of continuous scanning, where the mobile device alternates between scanning for sync signals and entering a low-power state. This periodic action reduces power consumption while maintaining acceptable detection latency by optimizing the scan interval based on deployment density and traffic conditions.
Solution Approach 2:
The system performs preliminary actions by having MCSCs transmit sync signals in predetermined time intervals and sectors before the mobile device needs to detect them. This allows the device to scan less frequently while still detecting signals within acceptable latency bounds, as the signals are already positioned and timed for periodic detection.
2Productivity
If MCSCs are deployed densely in high-traffic areas to accommodate growing demand, then network capacity is improved, but the complexity of sync signal detection increases due to directional nature and signal interference
Solution Approach 1:
The patent segments the detection process into distinct phases: sync signal detection, beamforming establishment, and data transmission. It also segments the sync signal transmission into multiple sectors that are swept sequentially. This segmentation simplifies detection complexity by breaking down the dense deployment challenge into manageable, sequential steps rather than requiring simultaneous processing of all signals.
Solution Approach 2:
The patent introduces beamforming as an intermediary mechanism between the mobile device and MCSCs in dense deployments. By establishing directional beams after initial sync signal detection, the system mediates the interference problem in dense deployments, allowing multiple MCSCs to operate simultaneously without overwhelming the detection process.
3Measurement precision
If directional sync signals are transmitted through various sectors in sequence to enable MCSC discovery, then detection accuracy is improved, but the time required for detection increases
Solution Approach 1:
The patent implements dynamic sector sweeping where the transmission and detection of sync signals adapts based on conditions. If a sync signal is detected in one sector, the system dynamically adjusts by focusing subsequent beams in that direction rather than continuing to sweep all sectors sequentially. This dynamic approach maintains detection accuracy while significantly reducing detection time.
Solution Approach 2:
The system performs partial sector sweeping rather than complete sweeping of all sectors. By detecting sync signals in a subset of sectors and using beamforming to focus on promising directions, the patent achieves sufficient detection accuracy without the time cost of exhaustive sector scanning, applying partial action where full action is unnecessary.
Data Source
AI summary
Techniques for millimeter-wave (mmWave)-capable small cell detection are described. In one embodiment, for example, a mobile communication device may comprise at least one radio frequency (RF) transceiver, at least one RF antenna, and logic, at least a portion of which is in hardware, the logic to receive initiator sector sweep (ISS) monitoring instructions identifying one or more millimeter-wave (mmWave) frequency channels to be monitored, perform an ISS monitoring procedure comprising monitoring the one or more mmWave frequency channels, and send an ISS monitoring report indicating whether any mmWave-capable boosters have been detected during the ISS monitoring procedure. Other embodiments are described and claimed.