Semi-Persistent Scheduling Grant Selection for 5G Uplink

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Solution Overview

Problem

In 5G/NR systems, multiple Semi-Persistent Scheduling conflicts arise for the same User Equipment, limiting system capacity due to excessive control information overhead and scheduling conflicts.

Innovation Solution

The User Equipment selects an uplink resource grant used for previous data transmission to retransmit data when the HARQ buffer is not empty, and when empty, it selects one or multiple Semi-Persistent scheduling grants based on carrier access manner to transmit new data, avoiding conflicts by using consistent or expanded resource allocation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple Semi-Persistent schedulings are allowed for the same UE in 5G/NR systems, then scheduling flexibility and system capacity are improved, but scheduling conflicts among multiple grants arise

Engineering Contradiction:

Improvescheduling flexibilityVSAvoidscheduling conflict

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent changes the parameter of grant selection by introducing a priority mechanism. When multiple Semi-Persistent scheduling grants are available, the UE changes from being able to use any grant to selectively choosing based on priority levels, thereby resolving conflicts while maintaining multiple schedulings

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

Instead of allowing all grants to be used simultaneously and resolving conflicts through complex coordination, the patent inverts the approach by preemptively assigning priorities to different grants. The UE then selects grants in reverse order of conflict potential - using the highest priority grant when conflicts exist, and lower priority grants when resources are available

Inventive Principle:

Principle #13The other way round (Inversion)

2Productivity

If shared resources are used to schedule user data in LTE system, then resource utilization is improved, but excessive control information overhead limits system capacity

Engineering Contradiction:

Improveresource utilizationVSAvoidcontrol information overhead

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent extracts the essential scheduling information from the control channel and embeds it directly in the data transmission. By taking out the scheduling grant and incorporating it as part of the data payload through the Semi-Persistent scheduling mechanism, the system reduces control information overhead while maintaining resource utilization efficiency

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If only one Semi-Persistent scheduling is allowed for the same UE, then scheduling conflicts are avoided, but scheduling flexibility and system capacity are limited

Engineering Contradiction:

Improvescheduling conflict avoidanceVSAvoidsystem capacity

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent segments the single Semi-Persistent scheduling into multiple grants with different priorities and purposes. By dividing the scheduling resources into multiple segmented grants (e.g., different SPS-CellRNTIs, different priorities), the system can simultaneously maintain conflict avoidance through segmentation while increasing system capacity through multi-grant utilization

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11324021B2Data transmission and related product

Publication Date: 2022.05.03 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

A data transmission method and a related product are provided. The method includes: when a HARQ buffer is not empty, a user equipment selects a grant used for previous data transmission to transmit data that needs to be retransmitted; or, when the HARQ buffer is empty, the user equipment selects one current grant of Semi-Persistent scheduling to transmit new data or selects multiple current grants of Semi-Persistent scheduling to transmit new data according to a carrier access manner allowed by the user equipment.