D2D Communication Channel Scanning for Reduced Packet Loss
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Solution Overview
Problem
Electronic devices attempting to perform device-to-device communication in an off-network mode experience packet loss due to the inability to transmit/receive data packets while decoding master information blocks or system information blocks during network access scanning.
Innovation Solution
The device includes a wireless communication circuit and a processor configured to identify a specified mode, sequentially scan channels from an EARFCN list, decode system information blocks to select a cellular network, and perform D2D communication when the channel conditions are not met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electronic device performs network access scanning by decoding MIB or SIB during channel scanning, then network access capability is improved, but data packet transmission/reception for D2D communication is interrupted causing packet loss
Solution Approach 1:
The patent implements dynamic mode switching between network preferred mode and D2D preferred mode based on operational conditions. In network preferred mode, the device performs channel scanning and decodes MIB/SIB for network access. In D2D preferred mode, the device prioritizes continuous D2D communication by avoiding interruptions for network scanning. This dynamic adaptation resolves the contradiction by allowing the device to optimize for either network access or D2D communication continuity depending on the current operational context.
Solution Approach 2:
The patent changes the operational parameters of the wireless communication circuit by introducing a mode indicator that controls whether the device operates in network preferred mode or D2D preferred mode. When in D2D preferred mode, the device modifies its scanning behavior to minimize interruptions to D2D data packet transmission/reception, thereby reducing packet loss while maintaining the ability to access networks when needed.
2Measurement precision
If the electronic device continuously scans all channels in the EARFCN list, then network selection accuracy is improved, but communication continuity for D2D is degraded
Solution Approach 1:
The patent implements partial scanning by selectively scanning only a subset of channels in the EARFCN list rather than continuously scanning all channels. The mode indicator controls the scanning behavior: in D2D preferred mode, the device performs limited or no scanning to maintain communication continuity, while in network preferred mode, it performs more comprehensive scanning for accurate network selection. This partial action approach resolves the contradiction by providing just enough scanning to maintain network selection capability without excessive scanning that would interrupt D2D communication.
3Adaptability or versatility
If the electronic device attempts to access network while performing D2D communication, then network connectivity is improved, but D2D communication reliability is worsened due to packet loss
Solution Approach 1:
The patent uses dynamic mode switching to adapt between network connectivity and D2D communication reliability. The mode indicator allows the device to switch between network preferred mode (prioritizing network access attempts) and D2D preferred mode (prioritizing D2D communication reliability). This dynamic adaptation resolves the contradiction by allowing the system to optimize for the appropriate function based on current operational requirements.
Solution Approach 2:
The patent performs preliminary assessment of channel conditions through selective scanning before attempting network access. By evaluating channels in advance and identifying suitable networks, the device can transition to network mode more smoothly, reducing the duration and impact of interruptions to D2D communication. This preliminary action allows the device to maintain D2D communication reliability while still achieving network connectivity when needed.
Data Source
AI summary
An electronic device is provided. The electronic device includes a wireless communication circuit, a memory for storing an EARFCN list, and a processor configured to identify whether the electronic device is in a designated mode, when the electronic device is in the designated mode, perform a scan sequentially on at least some channels from among a plurality of channels included in the EARFCN list, when a first channel satisfying a first condition is identified as a result of the scan, identify whether the first channel corresponds to a second condition by decoding a system information block (SIB) or a master information block (MIB) received through the first channel, when the first channel satisfies the second condition, select a cellular network regarding the first channel, and when the first channel does not satisfy the second condition, stop the scan and perform D2D communication during a designated time.