LTE Semi-Persistent Scheduling Resource Release Optimization
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Solution Overview
Problem
In LTE-A systems, Semi-Persistent Scheduling (SPS) resources are frequently activated and deactivated due to consecutive zero data transmissions, leading to wastage of PDCCH resources as UEs tend to clear SPS resources even when they have data for transmission, causing frequent SPS implicitly deactivation.
Innovation Solution
Implement a method where the UE prioritizes using configured grants for data transmission when available and avoids transmitting consecutive zero MAC PDUs using configured grants, and clears the configured uplink grant only when specific conditions are met on both SPS and dynamic scheduling resources, ensuring data is transmitted using dynamic grants if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE transmits consecutive zero MAC PDUs using configured grants, then the SPS resource can be released when the UE does not have data for transmission, but the SPS resource is frequently activated and deactivated leading to wastage of PDCCH resources
Solution Approach 1:
The patent introduces dynamic adjustment of SPS resource release conditions based on transmission buffer status. The network can dynamically configure whether to release SPS resources after consecutive zero MAC PDU transmissions by checking if the UE has data in its transmission buffer, allowing the system to adapt between releasing resources for idle UEs and maintaining resources for UEs with pending data
Solution Approach 2:
The patent implements feedback mechanisms where the network monitors UE transmission buffer status and adjusts SPS resource allocation accordingly. The network receives feedback about data availability at the UE and uses this information to determine whether to maintain or release SPS resources, preventing premature resource release when data is pending
2Ease of operation
If the UE clears SPS resources after consecutive zero MAC PDU transmissions, then the SPS resource can be released when not needed, but the UE tends to clear SPS resources even when it has data for transmission causing frequent implicit deactivation
Solution Approach 1:
The patent applies preliminary action by checking the transmission buffer status before clearing SPS resources. Instead of automatically releasing resources after a fixed number of consecutive zero MAC PDUs, the system first checks whether the UE has data pending in its buffer, and only releases resources if the buffer is confirmed empty, preventing premature resource clearance
Solution Approach 2:
The patent enables self-service by allowing the UE to autonomously determine resource release conditions based on its own transmission buffer status. The UE monitors its own data availability and makes informed decisions about SPS resource maintenance or release without requiring external intervention, improving the reliability of data transmission
3Adaptability or versatility
If the network dynamically allocates resources for each transmission, then resource allocation can be optimized based on traffic volume and QoS requirements, but control information sent on PDCCH increases reducing system scheduling performance
Solution Approach 1:
The patent merges dynamic scheduling flexibility with semi-persistent resource allocation by combining SPS configured grants with dynamic buffer status checks. This hybrid approach allows the system to maintain pre-allocated resources for periodic traffic patterns while dynamically adjusting resource release decisions based on actual data availability, reducing PDCCH overhead while preserving allocation flexibility
Solution Approach 2:
The patent creates a universal resource allocation mechanism that functions effectively for both periodic traffic (VoIP) and variable traffic patterns. The SPS mechanism with enhanced release conditions provides multi-functionality, serving as a semi-persistent allocation for regular traffic while adapting to dynamic traffic conditions through buffer-status-aware resource release, eliminating the need for separate scheduling mechanisms
Data Source
AI summary
A method of handling Semi-Persistent Scheduling (SPS) transmission for a mobile device in a wireless communication system is disclosed. The mobile device has a dynamic grant and a configured grant for transmission in a subframe. The method comprises a step of transmitting a data in the subframe according to a usage status of the configured grant.