SPS Interval Selection for Grant-Free Wireless Devices

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Solution Overview

Problem

Current semi-persistent scheduling (SPS) in wireless communication systems faces challenges in balancing resource consumption and latency, particularly when configuring short SPS intervals for multiple devices, leading to inefficient resource utilization and increased processing demands.

Innovation Solution

The solution involves selecting SPS intervals based on the type of wireless device, Quality of Service Class Identifier (QCI), and network load to differentiate and optimize resource allocation, allowing for dynamic assignment of SPS intervals that adjust according to changing traffic and load conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If a short SPS interval (e.g., 1ms) is configured for all UEs to reduce latency, then latency is reduced, but resource consumption increases significantly

Engineering Contradiction:

ImprovelatencyVSAvoidresource consumption

Core Design Contradiction:

Loss of timeVSQuantity of substance

Solution Approach 1:

The patent applies local quality by differentiating SPS interval configurations based on UE types and traffic characteristics. Different UE categories (e.g., voice, video, data) are assigned different SPS intervals tailored to their specific latency and resource consumption requirements, rather than applying a uniform interval to all UEs.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements dynamics by enabling the network to dynamically adjust SPS intervals based on real-time traffic conditions and UE requirements. The system can modify scheduling parameters dynamically to balance latency performance and resource utilization across varying network loads.

Inventive Principle:

Principle #15Dynamics

2Loss of time

If a short SPS interval is used for all UEs, then latency is reduced, but processing requirements increase

Engineering Contradiction:

ImprovelatencyVSAvoidprocessing requirements

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The patent reduces processing requirements by implementing quality differentiation at the UE level. Instead of applying uniform processing to all UEs, the system tailors SPS configurations to individual UE types and traffic patterns, reducing the processing burden on both the network and UEs.

Inventive Principle:

Principle #3Local quality

3Loss of time

If SPS resources are reserved for UEs even when buffer is empty, then latency is maintained, but resource utilization becomes inefficient

Engineering Contradiction:

ImprovelatencyVSAvoidresource utilization efficiency

Core Design Contradiction:

Loss of timeVSLoss of energy

Solution Approach 1:

The patent applies parameter changes by modifying the SPS configuration parameters based on UE buffer status and network conditions. The system adjusts scheduling parameters dynamically to enable or disable SPS resources based on actual traffic conditions, optimizing the balance between latency maintenance and resource utilization efficiency.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP3777415B1Selecting a semi-persistent scheduling interval for grant-free wireless devices

Publication Date: 2024.01.10 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

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AI summary

According to certain embodiments, a method by a network node for selecting a semi-persistent scheduling (SPS) interval for a wireless device in a cell served by the network node includes determining criterion for selecting the SPS interval for the wireless device. The criterion is associated with at least one of a QoS requirement of the wireless device and a utilization of resources by the network node. The network node assigns the SPS interval to the wireless device based on the criterion.