D2D Source Address Change Indication for Seamless Packet Recovery

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Solution Overview

Problem

In device-to-device (D2D) communication, existing solutions fail to seamlessly handle changes in source addresses, leading to interruptions and recovery issues when a UE changes its source address during transmission, causing loss of IP packets and critical interruptions in communication.

Innovation Solution

A method where a user equipment (UE) obtains an indication to change its source address, generates a message with the new address, and transmits it using the old address, allowing for smooth transition to new resources and maintaining data packet association across address changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a UE changes its source address during D2D transmission, then the UE can transition to new resources and maintain communication flexibility, but the receiving UE loses track of data packets and communication interruptions occur

Engineering Contradiction:

Improveresource transition capabilityVSAvoiddata packet association

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The transmitting UE sends a notification message to the receiving UE before changing its source address. This preliminary action allows the receiving UE to prepare for the address change and maintain proper data packet association, preventing communication interruptions while enabling resource transitions

Inventive Principle:

Principle #10Preliminary action

2Productivity

If a UE changes its source address during transmission, then it can use different resources for communication, but IP packets are lost and communication integrity is broken

Engineering Contradiction:

Improveresource utilizationVSAvoidIP packet loss

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The system implements a feedback mechanism where the transmitting UE notifies the receiving UE of the upcoming source address change. This feedback loop ensures both UEs are synchronized, allowing resource transitions without losing IP packets or breaking communication integrity

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If a UE changes its source address, then it can adapt to different coverage states and resource allocations, but the receiving UE cannot correctly reassemble data at higher protocol layers

Engineering Contradiction:

Improvecoverage state adaptationVSAvoiddata reassembly process

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

By notifying the receiving UE in advance of the source address change, the system allows the receiving UE to update its internal state and preparation for reassembling data packets with the new address. This preliminary action simplifies the reassembly process at higher protocol layers while enabling coverage state adaptation

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS9743274B2Methods and devices for device to device communication source address change indication

Publication Date: 2017.08.22 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method implemented in a user equipment (UE) includes obtaining an indication for changing a first source address to a second source address, where the first source address is used in a device to device communication session. The method further includes obtaining the second source address. The method further includes generating a message including the second source address. The method also includes transmitting the generated message using the first source address.