Logical Channel Prioritization for D2D Sidelink Resource Allocation

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Solution Overview

Problem

Current D2D communication systems lack an effective method for transmitting data from multiple user equipment using the same resources, particularly in prioritizing logical channels for efficient data transmission in D2D communication environments.

Innovation Solution

A method where the MAC entity in User Equipment (UE) selects a ProSe Destination with the highest SL-LoCH Priority and performs Logical Channel Prioritization (LCP) for all SL-LoCHs belonging to that selected ProSe Destination, ensuring efficient resource allocation and data transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple user equipment transmit data using the same resources in D2D communication, then resource utilization efficiency is improved, but data transmission priority management becomes complex and inefficient

Engineering Contradiction:
Improveresource utilization efficiencyVSAvoidpriority management complexity
Core Design Contradiction:
ProductivityVSDevice complexity

Solution Approach 1:

The patent segments the D2D communication data transmission by introducing logical channel prioritization, where different logical channels are assigned different priority levels. This segmentation allows the system to manage multiple data streams with different importance levels separately, resolving the complexity of priority management while maintaining efficient resource utilization across multiple user equipment.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent changes the parameter of channel priority assignment by introducing SL-LoCH Priority as a specific parameter that can be configured and adjusted. This parameter change enables dynamic priority management where the network can assign different priority values to different logical channels based on service requirements, thereby simplifying the overall priority management mechanism while improving resource utilization efficiency.

Inventive Principle:
Principle #35Parameter changes

2Productivity

If logical channel prioritization is implemented for all SL-LoCHs, then data transmission efficiency is improved, but processing time and system overhead increase

Engineering Contradiction:
Improvedata transmission efficiencyVSAvoidprocessing time
Core Design Contradiction:
ProductivityVSLoss of time

Solution Approach 1:

The patent applies partial action by implementing logical channel prioritization selectively rather than uniformly for all logical channels. The system performs LCP procedure for SL-LoCHs that require priority management while allowing other channels to use default mechanisms, thereby improving data transmission efficiency for critical channels without incurring processing overhead for all channels.

Inventive Principle:
Principle #16Partial or excessive action

Solution Approach 2:

The patent applies local quality by assigning different priority management approaches to different logical channels based on their specific requirements. High-priority channels receive detailed LCP processing while lower-priority channels use simplified mechanisms, optimizing the balance between transmission efficiency and processing time through localized quality differentiation.

Inventive Principle:
Principle #3Local quality

Data Source

PatentEP3131352B1Method for performing a logical channel prioritization in a d2d communication system and device therefor
Publication Date: 2018.10.31 LG ELECTRONICS INC
  • EP3131352B1 patent drawingFigure 1
  • EP3131352B1 patent drawingFigure 2A
  • EP3131352B1 patent drawingFigure 2B

AI summary

The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for performing a Logical Channel Prioritization in a D2D communication system, the method comprising: configuring a plurality of sidelink logical channels, wherein each of the plurality of sidelink logical channels has an associated priority; selecting a ProSe Destination having a sidelink logical channel with a highest priority, among sidelink logical channels having data available for transmission; performing a LCP procedure for the all sidelink logical channels belonging to the selected ProSe Destination; and transmitting a MAC PDU generated by the LCP procedure.