Uplink Grant Logical Channel Priority Scheduling

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Solution Overview

Problem

In LTE wireless communication systems, it is challenging to ensure that uplink grants are used specifically for radio bearers with a certain logical channel priority, leading to difficulties in fine control of RB scheduling.

Innovation Solution

A method where user equipment (UE) receives uplink grant information and logical channel priority information, constructing data units that include data from radio bearers with specific logical channel priorities, and transmits these data units to the network, optionally including data from higher priority bearers or padding to fill remaining space.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If uplink grant is allocated for all radio bearers, then resource utilization is improved, but fine control of RB scheduling is lost

Engineering Contradiction:

Improveresource utilizationVSAvoidfine control of RB scheduling

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The patent segments the uplink grant allocation by introducing logical channel priority information that divides radio bearers into different priority groups. The uplink grant is then segmented to serve specific priority groups rather than all bearers uniformly, enabling fine control while maintaining resource utilization through targeted allocations.

Inventive Principle:

Principle #1Segmentation

2Device complexity

If uplink grant is allocated without logical channel priority information, then scheduling complexity is reduced, but ability to control specific RB scheduling is worsened

Engineering Contradiction:

Improvescheduling complexityVSAvoidability to control specific RB scheduling

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

The patent applies local quality by associating specific logical channel priority information with specific uplink grants. This allows different parts of the scheduling system to have different characteristics - some grants with priority control and others without - enabling fine control where needed while maintaining simplicity where not required.

Inventive Principle:

Principle #3Local quality

3Productivity

If uplink grant is used for all RBs, then transmission efficiency is improved, but precision of priority-based scheduling is reduced

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidprecision of priority-based scheduling

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent introduces dynamic control by allowing the network to flexibly indicate logical channel priority information with each uplink grant allocation. This dynamic mechanism enables the system to adapt between broad efficient allocations and precise priority-based allocations depending on current network conditions and requirements.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11653381B2Uplink transmission based on UL-grant associated with specific logical channel priority

Publication Date: 2023.05.16 LG ELECTRONICS INC

AI summary

Method and apparatus for a user equipment (UE) transmitting uplink signals in a wireless communication system are disclosed. For this end, the UE, receiving first uplink grant information and logical channel priority information associated with the first uplink grant, constructs a first data unit including data from one or more radio bearers with first logical channel priority corresponding to the logical channel priority information. And, the UE transmits the first data unit to a network.