MAC PDU Priority Logic for LTE BSR and CCCH Transmission

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Solution Overview

Problem

Existing technologies do not efficiently and quickly transmit buffer status reports (BSR) in LTE systems, leading to inefficiencies in radio resource allocation and potential call disconnections during handovers.

Innovation Solution

The method prioritizes CCCH data over BSR and other logical channel data for transmission, ensuring that CCCH data is sent first using allocated radio resources, followed by BSR and other logical channel data, to minimize call disruptions and optimize radio resource usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If BSR is transmitted with higher priority than CCCH data, then BSR transmission speed is improved, but call connection reliability deteriorates

Engineering Contradiction:

ImproveBSR transmission speedVSAvoidcall connection reliability

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent changes the priority parameter assignment by defining CCCH data priority as higher than BSR priority. This parameter change resolves the contradiction by ensuring call connection reliability is maintained while still allowing BSR transmission to occur within the same MAC PDU structure.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent segments the MAC PDU into distinct parts: CCCH data is placed in the first segment (higher priority), followed by BSR and other logical channel data. This segmentation allows the system to maintain call reliability through prioritized CCCH transmission while still accommodating BSR transmission in subsequent segments.

Inventive Principle:

Principle #1Segmentation

2Reliability

If CCCH data is prioritized over BSR, then call connection reliability is improved, but BSR transmission efficiency deteriorates

Engineering Contradiction:

Improvecall connection reliabilityVSAvoidBSR transmission efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent merges CCCH data and BSR into the same MAC PDU transmission. By combining these transmissions and assigning appropriate priorities within the same protocol data unit, the system maintains call reliability through CCCH prioritization while improving BSR transmission efficiency through multiplexing in the same transmission opportunity.

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If radio resources are allocated without prioritization, then resource allocation flexibility is improved, but transmission efficiency deteriorates

Engineering Contradiction:

Improveresource allocation flexibilityVSAvoidtransmission efficiency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent introduces a priority parameter for different logical channels (CCCH, BSR, other data) that changes the resource allocation behavior. This parameter change enables the system to maintain flexibility in allocating resources to different channel types while improving transmission efficiency through priority-based scheduling that ensures critical control data is transmitted first.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP2894922B1Method for transmitting MAC PDUs

Publication Date: 2019.03.06 LG ELECTRONICS INC

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AI summary

With respect to generating and sending a MAC PDU by using the radio resources allocated to the mobile terminal, the level of priority between the buffer status report (BSR) and the established logical channels are defined such that the data of each logical channel and buffer status report can be more effectively, efficiently and quickly transmitted.