Synchronization Beacon Signaling for Narrow-Bandwidth Endpoints
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Solution Overview
Problem
Low-cost, battery-operated devices with narrow reception bandwidth and limited computing power struggle to synchronize and register with communication systems using high-bandwidth signals due to unknown frequency and time offsets, preventing them from accessing LPWAN networks.
Innovation Solution
A control signal is transmitted with a distributed frequency-hopping-based allocation, accompanied by a reference signal with partial data packets that provide information about the control signal's hopping pattern, allowing devices to synchronize and decode using a narrower receiver bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency-hopping-based distributed transmission is used to increase communication bandwidth and reliability, then communication reliability is improved, but device complexity increases due to unknown frequency and time offsets requiring full search
Solution Approach 1:
The base station transmits synchronization beacons before the actual data communication begins. These beacons contain synchronization information that allows endpoint devices to pre-align their frequency and time offsets before receiving the main data packets, eliminating the need for full search during data transmission.
Solution Approach 2:
A synchronization beacon acts as an intermediary signal between the base station and endpoint devices. This beacon carries specific synchronization information that mediates the frequency and time offset alignment, allowing devices to synchronize without performing complex full searches across the entire frequency band.
2Use of energy by moving object
If narrow reception bandwidth is used in low-cost devices to reduce power consumption, then energy efficiency is improved, but adaptability deteriorates because devices cannot access high-bandwidth communication systems
Solution Approach 1:
The communication process is segmented into two distinct phases: a synchronization phase where the base station transmits beacons with synchronization information, and a data transmission phase where actual communication occurs. This segmentation allows low-cost devices to operate with narrow bandwidth during the data phase while still achieving synchronization through the beacon phase.
Solution Approach 2:
Synchronization information is transmitted in advance through beacons before data communication begins. This preliminary action allows low-cost devices with narrow reception bandwidth to acquire the necessary synchronization parameters without needing to continuously monitor wide bandwidth, enabling them to access high-bandwidth communication systems.
3Measurement precision
If full search for signals in time and frequency is performed to handle unknown offsets, then measurement precision is improved, but loss of time increases due to extended synchronization duration
Solution Approach 1:
The base station transmits synchronization beacons in advance that contain pre-computed synchronization information. This preliminary transmission of alignment data eliminates the need for endpoint devices to perform time-consuming full searches across the entire frequency and time space, significantly reducing synchronization duration while maintaining precision.
Solution Approach 2:
The synchronization beacon provides feedback information about the base station's frequency and time parameters directly to the endpoint devices. This feedback mechanism allows devices to quickly adjust their local oscillators and timing without performing exhaustive search, reducing the time required to achieve precise synchronization.
Data Source
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AI summary
Embodiments relate to an end point of a communication system, wherein a control signal is transmitted in the communication system in order to coordinate the subscribers of the communication system, and the control signal is transmitted in a distributed manner corresponding to the frequency hopping-based allocation of resources of the frequency band, said allocation being specified by a control signal hopping pattern. The endpoint has a receiver, and the reception bandwidth of the receiver is narrower than the bandwidth of the frequency hopping-based allocation of resources of the frequency band at least by a factor of 3. The end point is designed to receive a reference signal, the reference signal has information on the control signal, and the end point is designed to receive the control signal on the basis of the information on the control signal.