Unicast-Multicast Packet Handling in Wireless Nodes

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Solution Overview

Problem

Current wireless communication systems lack a solution for managing packets in multicast links after successful unicast transmission, leading to potential packet deletion and increased traffic delay.

Innovation Solution

A method where a first entity used for unicast transmission acknowledges successful packet transmission, and a second entity associated with the same higher layer entity does not delete duplicated packets when used for non-unicast transmission, ensuring packet continuity and reducing higher layer retransmissions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the second entity deletes duplicated packets after successful unicast transmission, then packet duplication is reduced, but traffic continuity is disrupted and delay increases

Engineering Contradiction:

Improvepacket continuityVSAvoidtraffic delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies local quality by differentiating packet deletion behavior based on the transmission mode of the second entity. When the second entity operates in unicast mode, duplicated packets are deleted to avoid redundancy. When operating in non-unicast mode, duplicated packets are retained to ensure traffic continuity. This localized adaptation of deletion policy resolves the contradiction between reducing duplication and maintaining continuity.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements dynamic packet deletion by making the deletion decision dependent on the real-time transmission mode of the second entity. The system dynamically adjusts whether to delete duplicated packets based on whether the second entity is in unicast or non-unicast mode, optimizing both packet continuity and delay performance under different operational conditions.

Inventive Principle:

Principle #15Dynamics

2Reliability

If the second entity retains duplicated packets for non-unicast transmission, then traffic continuity is maintained, but unnecessary data transmission occurs

Engineering Contradiction:

Improvetraffic continuityVSAvoidtransmission energy

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent applies local quality by differentiating packet retention behavior based on the transmission mode of the second entity. When the second entity operates in unicast mode, duplicated packets are deleted to avoid unnecessary transmission. When operating in non-unicast mode, duplicated packets are retained to ensure traffic continuity. This localized adaptation of retention policy resolves the contradiction between maintaining continuity and reducing energy consumption.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements dynamic packet retention by making the retention decision dependent on the real-time transmission mode of the second entity. The system dynamically adjusts whether to retain or delete duplicated packets based on whether the second entity is in unicast or non-unicast mode, optimizing both traffic continuity and energy efficiency under different operational conditions.

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If the system uses separate RLC entities for unicast and non-unicast, then transmission flexibility is improved, but device complexity increases

Engineering Contradiction:

Improvetransmission flexibilityVSAvoidentity management complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies universality by designing the second entity to serve multiple functions - it can operate in both unicast and non-unicast modes. This multi-functionality allows the system to maintain transmission flexibility through mode switching while avoiding the complexity of maintaining completely separate RLC entities for each transmission type. The second entity adapts its behavior based on the required transmission mode, reducing overall system complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11950134B2Method and device in communication nodes for wireless communication

Publication Date: 2024.04.02 APOGEE NETWORKS LLC

AI summary

The present disclosure discloses a method and a device in communication nodes for wireless communications. In a first node, a successful transmission of a first packet is acknowledged by a first entity, the first entity being used for unicast; a second entity being used for non-unicast does not indicate that the second entity deletes a duplicated first packet; the second entity being used for unicast indicates that the second entity deletes a duplicated first packet; herein, the first entity and the second entity are associated with a same higher layer entity. The present disclosure helps avoid deleting a same packet repeatedly transmitted through multicast, thus ensuring the continuity of traffics received by multicast, which further reduces higher layer retransmissions triggered by deletion of the packet, thus decreasing traffic delay.