Off Grid Radio Device Discovery Using Narrowband Resource Allocation
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Solution Overview
Problem
Current wireless communication systems face challenges in supporting direct device-to-device communications, especially in scenarios where devices are out of coverage from traditional cellular base stations, due to limitations in bandwidth and power, leading to inefficiencies in device discovery and communication.
Innovation Solution
The implementation of narrowband device-to-device wireless discovery communications using techniques such as frequency hopping, orthogonal codes, and specific resource allocation strategies, allowing devices to perform peer-to-peer communications even without infrastructure support, utilizing NB-IoT carriers and OGRS systems for extended range and robust discovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If narrowband communication is used for device-to-device discovery, then bandwidth consumption is reduced and power efficiency is improved, but communication range and discovery capability are limited
Solution Approach 1:
The patent implements periodic discovery signals transmitted at regular intervals to enable devices to discover each other in narrowband communication. The periodic transmission allows devices to listen at specific time windows, reducing continuous power consumption while maintaining discovery capability through repeated opportunities for detection.
Solution Approach 2:
The patent uses preliminary synchronization signals and resource allocation configurations transmitted before actual data communication. These preliminary actions establish the communication framework and timing, enabling efficient narrowband discovery without requiring continuous high-power transmissions.
2Reliability
If infrastructure mode communication is used, then network coverage and service reliability are improved, but device complexity and dependency on base stations increase
Solution Approach 1:
The patent enables devices to perform self-discovery and establish direct communication links without requiring continuous infrastructure support. Devices autonomously select resources, synchronize timing, and maintain connections independently, reducing dependency on base stations while maintaining reliability through distributed operation.
Solution Approach 2:
The patent introduces virtual base station functionality where selected devices act as intermediaries for other devices in the network. This allows infrastructure-mode reliability to be maintained through device-to-device relaying, reducing actual infrastructure dependency while preserving network coverage capabilities.
3Productivity
If wideband communication channels are used for discovery, then discovery speed and communication capacity are improved, but bandwidth consumption and interference increase
Solution Approach 1:
The patent segments the discovery process into multiple narrowband resource blocks distributed across time and frequency. Instead of using a single wideband channel, discovery signals are divided into multiple narrowband transmissions, maintaining discovery speed through parallel opportunities while reducing peak bandwidth consumption and interference.
Solution Approach 2:
The patent transitions from wideband frequency-domain discovery to time-domain multiplexed narrowband discovery. By adding the time dimension with periodic discovery windows and multiple opportunity slots, the system achieves discovery speed without requiring large instantaneous bandwidth, effectively trading frequency width for time duration.
Data Source
AI summary
This disclosure relates to techniques for supporting narrowband device-to-device wireless communication, including possible techniques for performing discovery in an off grid radio system. A wireless device may obtain synchronization with a peer-to-peer communication group. The wireless device may determine the location of the wireless device within the peer-to-peer communication group based at least in part on signal strength of a synchronization signal used to obtain the synchronization. The wireless device may perform peer-to-peer discovery in the peer-to-peer communication group, such that time and frequency resources used by the wireless device to perform the peer-to-peer discovery are determined based at least in part on the location of the first wireless device within the peer-to-peer communication group.