Uplink Semi-Persistent Scheduling Periodicity Offset Configuration
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Solution Overview
Problem
In 3GPP LTE TDD Configuration 2, semi-persistent scheduling in the multi-periodicity mode experiences lower resource utilization ratios and excessive overhead due to dynamic scheduling, leading to resource conflicts and underutilization of uplink sub-frames.
Innovation Solution
Setting different periodicity offsets, delta, for semi-persistent scheduling starting with respective uplink sub-frames in a radio frame, based on the ratio of uplink to downlink sub-frames and their locations scheduled by the Physical Downlink Control Channel (PDCCH), to determine and schedule periodicities for uplink new transmissions, thereby making all uplink sub-frames available for semi-persistent scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If semi-persistent scheduling is used with fixed periodicity in TDD Configuration 2, then resource allocation is simplified and PDCCH overhead is reduced, but resource conflicts occur between retransmitted packets and newly transmitted packets
Solution Approach 1:
The patent applies dynamics by making the semi-persistent scheduling periodicity configurable and adaptable. Instead of using a fixed periodicity that causes conflicts, the system allows dynamic adjustment of the periodicity value (e.g., 20ms, 40ms, or other values) based on actual service requirements and TDD configuration, thereby avoiding resource conflicts while maintaining the benefits of semi-persistent scheduling
Solution Approach 2:
The patent changes the parameter of scheduling periodicity from a fixed value to a configurable parameter. By allowing the periodicity to be set according to different TDD configurations and service types, the system can avoid resource conflicts between HARQ retransmissions and new transmissions while still reducing PDCCH overhead compared to dynamic scheduling
2Reliability
If multi-periodicity mode is used to avoid resource conflicts, then resource confliction is resolved, but resource utilization ratio decreases and dynamic scheduling overhead increases
Solution Approach 1:
The patent optimizes the periodicity parameter to achieve the best balance between avoiding resource conflicts and maximizing resource utilization. By selecting appropriate periodicity values based on TDD configuration and service characteristics, the system avoids the need for complex multi-periodicity modes while maintaining high resource utilization and minimizing dynamic scheduling overhead
3Reliability
If synchronous non-adaptive HARQ is used with fixed resources, then retransmission reliability is improved, but resource flexibility is reduced causing conflicts with semi-persistent scheduling
Solution Approach 1:
The patent introduces dynamics by making the resource allocation flexible and configurable. Instead of fixing HARQ retransmission resources in a way that conflicts with semi-persistent scheduling, the system allows dynamic configuration of periodicity and resource allocation patterns that adapt to both HARQ reliability requirements and semi-persistent scheduling needs
Data Source
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AI summary
A method for user uplink data scheduling and an user equipment are applied in multi-period mode semi-persistent scheduling under 3GPP Long Term Evolution TDD configuration 2, the method includes setting the different offsets delta of periods for multi-period mode semi-persistent scheduling started by each uplink sub-frame in 10ms radio frame, determining the periods of multi-period mode semi-persistent scheduling started by each uplink sub-frame in 10ms radio frame according to the set delta, and scheduling the uplink new conveyed package data of user according to the periods of multi-period mode semi-persistent scheduling started by each uplink sub-frame in 10ms radio frame. The method and user equipment can be used to increase the utilization ratio of resource, and are simple and easy to use.