PDAN Message Coding Scheme for Multi-Carrier Ack/Nack Throughput

Solution Overview

Problem

In wireless networks, particularly in Downlink Multi Carrier mode, the current Ack/Nack bitmap size and efficiency are insufficient to maintain a balanced rate between data block transmission and acknowledgment, leading to suboptimal downlink bandwidth and potential stalling of the RLC engine.

Innovation Solution

Implementing a higher coding scheme, such as CS-3, for the Packet Downlink Ack/Nack (PDAN) messages to increase the bitmap size and efficiency, allowing the mobile station to acknowledge receipt of data blocks at a rate that matches the transmission rate of multiple downlink carriers, and allowing for multi-segmented or multiple PDAN messages to be sent in response to a single poll indication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If a higher coding scheme (CS-3) is used for PDAN messages, then the Ack/Nack bitmap size and efficiency are increased, but the message complexity and processing requirements are increased

Engineering Contradiction:

ImproveAck/Nack bitmap sizeVSAvoidcoding scheme complexity

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The patent changes the coding scheme parameter from CS-1 to CS-3 for PDAN messages, which increases the bitmap size capability. This parameter change allows the system to accommodate larger numbers of data blocks across multiple downlink carriers while maintaining efficient acknowledgment reporting.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If multiple downlink carriers are used for data block transmission, then the downlink bandwidth and throughput are increased, but the Ack/Nack reporting capacity becomes insufficient

Engineering Contradiction:

Improvedownlink throughputVSAvoidAck/Nack reporting capacity

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent changes the coding scheme parameter from CS-1 to CS-3 for PDAN messages, which increases the bitmap size capability. This parameter change allows the system to accommodate larger numbers of data blocks across multiple downlink carriers while maintaining efficient acknowledgment reporting.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If the Ack/Nack bitmap size is increased to match multiple downlink carriers, then the acknowledgment throughput balances the transmission rate, but the control message size increases

Engineering Contradiction:

Improveacknowledgment throughputVSAvoidcontrol message size

Core Design Contradiction:

ProductivityVSVolume of moving object

Solution Approach 1:

The patent changes the coding scheme parameter from CS-1 to CS-3 for PDAN messages, which increases the bitmap size capability. This parameter change allows the system to accommodate larger numbers of data blocks across multiple downlink carriers while maintaining efficient acknowledgment reporting.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP3709544B1Radio access network node and mobile station with increased ack/nack space for packet downlink ack/nack message

Publication Date: 2022.04.13 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

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Figure 2A
Figure 2B~2C

AI summary

A radio access network node (e.g., base station system), a mobile station, and various methods are described herein that increase the size and/or efficiency of an ack/nack bitmap in one or more control messages (e.g., Packet Downlink Ack/Nack message(s)). The mobile station when operating in a Downlink Multi Carrier mode sends the one or more control messages to the radio access network node.