SPS Resource Release Confirmation via MAC Control Element

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Solution Overview

Problem

The reliability of acknowledgement responding to semi-persistent scheduling (SPS) resource release commands is poor in wireless communication systems, leading to potential interference between UEs due to premature reuse of SPS resources by the eNB, especially in the case of failure releases where the UE fails to receive the release command.

Innovation Solution

A method and device for improving SPS resource release in a UE, where allocated SPS resources are deactivated upon receiving a release command, and a MAC control element is transmitted to confirm deactivation, enhancing the reliability of resource release confirmation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the eNB does not require waiting for a UE reply for SPS resource release, then the resource release process is fast and simple, but the reliability of resource release is poor leading to potential interference between UEs

Engineering Contradiction:

Improveresource release speedVSAvoidresource release reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements a feedback mechanism where the UE sends an acknowledgement signal (ACK) back to the eNB to confirm successful reception of the SPS resource release command. This feedback loop ensures the eNB knows whether the release was successfully received, preventing premature resource reassignment and interference, while still maintaining relatively fast release process.

Inventive Principle:

Principle #23Feedback

2Reliability

If the eNB waits for UE confirmation before reusing SPS resources, then the reliability of resource release is improved, but the resource release process becomes slower and more complex

Engineering Contradiction:

Improveresource release reliabilityVSAvoidrelease process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The UE autonomously determines whether to send the acknowledgement based on whether it successfully received the release command. The UE self-services the confirmation process by independently evaluating its reception status and initiating the appropriate response (ACK or no response), simplifying the overall process while maintaining reliability.

Inventive Principle:

Principle #25Self-service

3Productivity

If the eNB reassigns SPS resources immediately after sending release command, then resource utilization efficiency is high, but interference between UEs may occur due to failure release

Engineering Contradiction:

Improveresource utilization efficiencyVSAvoidinterference between UEs

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The acknowledgement mechanism provides critical feedback to the eNB about whether the release command was successfully received. This feedback enables the eNB to make informed decisions about resource reassignment timing, ensuring resources are only reassigned when the previous UE has confirmed release, thereby preventing interference while maintaining efficient resource utilization.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS9178667B2Method and apparatus for improving a semi-persistent scheduling resource release process in a wireless communication system

Publication Date: 2015.11.03 HTC CORP

AI summary

A method of improving a semi-persistent scheduling (SPS) resource release process for a medium access control (MAC) layer of a user equipment in a wireless communication system includes deactivating allocated SPS resources when receiving an SPS resource release command and transmitting a MAC control element including an SPS resource release confirmation for confirming SPS resource deactivation.