Uplink Grant Scheduling for 5G Wireless Networks
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Solution Overview
Problem
Dynamic scheduling in wireless networks is less ideal for low-latency or periodic transmissions due to delay and overhead requirements, necessitating the development of semi-persistent scheduling (SPS) to reduce scheduling overhead and support low-latency communications.
Innovation Solution
The technique involves simultaneously configuring multiple uplink grants of different types, including dedicated SPS, contention-based SPS, and dynamic uplink grants, to accommodate various service requirements and traffic patterns, allowing for efficient resource allocation and utilization in 5G wireless networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic scheduling is used for uplink transmissions, then resources can be allocated when data is available, but scheduling delay and overhead increase for periodic transmissions
Solution Approach 1:
The base station pre-configures the UE with multiple uplink grants of different types (dynamic, SPS, contention-based SPS) in advance. Each grant type is prepared with specific parameters and resource allocations before data arrives, enabling immediate transmission without waiting for dynamic scheduling decisions during periodic transmissions.
Solution Approach 2:
The system dynamically selects among multiple pre-configured uplink grant types based on real-time conditions. The UE can switch between dynamic grants, SPS grants, and contention-based SPS grants depending on data arrival patterns, channel conditions, and buffer status, optimizing both latency and resource utilization.
2Loss of time
If semi-persistent scheduling is used to reduce overhead, then periodic transmissions are optimized, but flexibility for bursty transmissions is reduced
Solution Approach 1:
The system implements multiple uplink grant types that serve different transmission patterns within a unified framework. Dynamic grants handle bursty transmissions, while SPS grants handle periodic transmissions. The base station configures both types for the same UE, allowing the system to adapt to different traffic patterns without sacrificing overhead efficiency or flexibility.
Solution Approach 2:
The system changes scheduling parameters dynamically by selecting different grant types. When periodic traffic is detected, SPS parameters (periodicity, fixed resources) are activated to reduce overhead. When bursty traffic occurs, dynamic grant parameters (flexible timing, variable resources) are activated to provide adaptability.
3Productivity
If multiple uplink grants of different types are configured simultaneously, then resource allocation efficiency improves, but system complexity increases
Solution Approach 1:
The uplink grant configuration is segmented into distinct types (dynamic, SPS, contention-based SPS), each with specific parameters and purposes. This segmentation allows the base station to manage complexity by treating each grant type independently while the UE benefits from having multiple specialized options available for different transmission scenarios.
Data Source
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AI summary
Aspects of the present disclosure provide for scheduling multiple types of uplink grants for a single user equipment to support different types of service with different traffic patterns and quality of service (QoS) requirements. In some aspects of the disclosure, the user equipment may be configured with uplink grants for different types of semi-persistent scheduling, along with a dynamic uplink grant. In some examples, the different types of semi-persistent scheduling may include dedicated semi-persistent scheduling and contention-based semi-persistent scheduling.