DHCP Relay MIP Registration Failure Handling

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Solution Overview

Problem

Existing DHCP relays are unable to initiate messages proactively or convert ACK messages to NAK messages, leading to transmission errors when MIP registration fails, as they cannot reclaim IP addresses or notify terminals of IP address unavailability.

Innovation Solution

A method where a DHCP relay receives a DHCP request message, prompts MIP registration procedures, and sends the MIP registration result to a DHCP server, returning a NAK response if registration fails, preventing subsequent transmission errors and conserving resources by avoiding repeated requests.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If DHCP relay uses traditional passive message forwarding, then device complexity is reduced, but reliability deteriorates because it cannot proactively reclaim IP addresses or convert ACK to NAK when MIP registration fails

Engineering Contradiction:

ImproveMIP registration failure handlingVSAvoidDHCP relay functionality

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The DHCP relay transitions from a static passive forwarder to a dynamic active participant that can initiate messages and convert ACK to NAK based on MIP registration status, enabling proactive failure handling while maintaining core relay functionality

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system implements feedback mechanism where the DHCP relay receives MIP registration status information and uses this feedback to determine whether to send NAK messages to the terminal or reclaim IP addresses from the DHCP server, creating a closed-loop failure handling system

Inventive Principle:

Principle #23Feedback

2Reliability

If DHCP relay continuously monitors and manages MIP registration status, then reliability improves, but loss of time increases due to additional processing and message handling

Engineering Contradiction:

ImproveIP address allocation accuracyVSAvoidRegistration status management time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The DHCP relay performs preliminary action by proactively sending NAK messages and reclaiming IP addresses before the terminal can send repeated DHCP requests, preventing waste of time on unsuccessful allocation attempts

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system skips unnecessary time-consuming DHCP request-response cycles by using MIP registration status information to directly send NAK messages and reclaim addresses, bypassing the need for repeated allocation attempts

Inventive Principle:

Principle #21Skipping (Rushing through)

3Loss of substance

If DHCP relay actively manages IP address allocation based on MIP registration, then loss of substance decreases by preventing IP address wastage, but device complexity increases due to additional control logic

Engineering Contradiction:

ImproveIP address wastageVSAvoidDHCP relay control logic

Core Design Contradiction:

Loss of substanceVSDevice complexity

Solution Approach 1:

The DHCP relay uses feedback from MIP registration status to intelligently control IP address allocation, sending NAK messages when registration fails and reclaiming addresses to prevent wastage, creating a smart resource management system

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system discards failed IP address allocation attempts and recovers addresses by sending NAK messages and reclaiming them from the DHCP server, preventing IP address wastage and improving resource utilization efficiency

Inventive Principle:

Principle #34Discarding and recovering

Data Source

PatentEP2381727B1Method and device for requesting and distributing address of connection point

Publication Date: 2015.11.04 HUAWEI TECH CO LTD

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AI summary

The present invention relates to mobile communications, and discloses a method and device for requesting and allocating connection point addresses. Therefore, transmission errors of subsequent messages of a terminal are avoided when the MIP registration of the terminal fails. The method includes: receiving a request for an IP address from a terminal and a MIP registration result of the terminal; and returning a response indicative of IP address allocation failure if the registration result is registration failure.