Contention-Based PUSCH for Low-Latency Uplink Data
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Solution Overview
Problem
Current mobile communication systems face increased latency in uplink data transmission due to resource allocation procedures based on base station scheduling, which is inadequate for applications sensitive to delay or transmitting small, intermittent data.
Innovation Solution
Defining a contention-based radio resource region and scheduling request signal to minimize latency, allowing user equipment to transmit uplink data without relying on base station scheduling, using contention-based PUSCH resource blocks and HARQ/ARQ acknowledgments for efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If base station scheduling is used for resource allocation, then resource utilization is maximized, but uplink data transmission latency increases
Solution Approach 1:
The resource allocation process is segmented into two parts: a scheduled resource allocation component (for normal traffic) and a contention-based resource allocation component (for delay-sensitive traffic). This segmentation allows different transmission modes to coexist, where UEs can use contention-based access for urgent small data packets without affecting the overall resource utilization optimized by base station scheduling.
Solution Approach 2:
The system dynamically switches between scheduled resource allocation and contention-based resource allocation based on traffic characteristics. For delay-sensitive applications or small intermittent data, the system enables contention-based access, allowing UEs to transmit data immediately without waiting for base station scheduling decisions, thereby reducing latency while maintaining resource utilization efficiency.
2Productivity
If base station scheduling is used for resource allocation, then resource management is optimized, but transmission speed for delay-sensitive applications decreases
Solution Approach 1:
The system performs preliminary configuration of contention-based resources in advance, pre-allocating resource blocks and configuring parameters for contention-based access. This preliminary action enables UEs to immediately transmit delay-sensitive data without waiting for real-time scheduling decisions, thus improving transmission speed while the base station maintains overall resource management efficiency through pre-planned resource allocation.
3Productivity
If scheduled resource allocation is used, then resource allocation is efficient, but latency for small intermittent data increases
Solution Approach 1:
The contention-based resource allocation mechanism enables UEs to self-service for resource acquisition when transmitting small intermittent data. UEs can independently access pre-configured contention-based resources without requiring base station scheduling intervention, thereby reducing latency for small data transmissions while the base station maintains efficient resource allocation through centralized management of the contention-based resource pool.
Data Source
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AI summary
Provided are a method and apparatus for transmitting uplink data. Particularly, a method for transmitting uplink data in a wireless communication system, the method includes transmitting, by a user equipment, a scheduling request to a base station, and transmitting, by the user equipment, uplink data through a contention-based physical uplink shared channel (PUSCH) resource block that can transmit the uplink data without a uplink grant of the base station, wherein the scheduling request and the contention-based PUSCH resource block may be transmitted in an identical subframe.