Wireless LAN EV-SECC Pairing Using Early SDP Binding
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Solution Overview
Problem
In wireless LAN-based smart charging or charging/discharging environments, the irregular and transient characteristics of wireless LAN communication lead to frequent failures in pairing between electric vehicles (EVs) and supply equipment communication controllers (SECCs), making reliable pairing challenging.
Innovation Solution
A proactive pairing method using the Supply Equipment Communication Controller (SECC) Discovery Protocol (SDP) that involves transmitting a discovery request message to an SDP server with an EV identifier, receiving a response message indicating the corresponding SECC, and establishing a session setup request to facilitate early and reliable pairing without restarting the session.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reactive pairing scheme is used in wireless LAN-based smart charging, then pairing can be confirmed through session setup, but frequent pairing failures occur due to irregular and transient characteristics of wireless LAN communication
Solution Approach 1:
The patent applies preliminary action by performing pairing confirmation before session establishment. The SECC and EV perform mutual authentication and pairing confirmation in advance through binding information exchange, so that when session setup is needed, the pairing is already confirmed, avoiding the need to restart the entire session due to pairing failures.
Solution Approach 2:
The patent introduces binding information as an intermediary element that facilitates reliable pairing. The binding information containing EV identifier and SECC identifier acts as a mediator that allows the EV and SECC to confirm their pairing relationship without requiring repeated authentication during session setup, thus improving reliability while reducing time loss.
2Measurement precision
If fine positioning using another form of pairing is performed, then pairing detection can be enhanced, but false pairing detection occurs and requires reaction to incorrect pairing
Solution Approach 1:
The patent applies feedback by implementing a verification mechanism where the SECC receives binding information from the EV, verifies it against its own records, and only confirms pairing when the information matches. This feedback loop ensures accurate pairing detection without false positives, as the SECC can validate the EV's claimed pairing status before accepting it.
Data Source
AI summary
Disclosed are an active earlier pairing method and device for wireless LAN-based smart charging or smart charging and discharging, wherein it is not necessary to restart a V2GTP communication session of an Electric Vehicle Communication Controller (EVCC). An active pairing method performed by an electric vehicle (EV) comprises the steps of: transmitting, to a supply equipment communication controller (SECC) Discovery Protocol (SDP) server, an SDP request message including an EVID by which the EV can be identified; and receiving, from the SDP server communicating with SECCs, an SDP response message including information indicating a specific SECC that controls electric vehicle supply equipment (EVSE) in which the EV parks or into which the EV is plugged.