Pre-configured PUSCH Resource Allocation for Low Latency Uplink
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Solution Overview
Problem
Current wireless communication systems, particularly in 3GPP LTE and emerging 5G NR, face challenges in reducing latency for uplink transmission, especially for small-sized packets, due to limitations in beamforming techniques and resource allocation methods, which hinder efficient data transmission in scenarios requiring extremely low latency.
Innovation Solution
A method and apparatus for configuring a pre-scheduled physical uplink shared channel (PUSCH) in wireless communication systems, where user equipment (UE) receives a configuration from the network for resource allocation, allowing for dynamic adjustment of resources, enabling contention-based access and reducing latency by pre-configuring resources for UL data transmission without the need for initial scheduling requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional scheduling request mechanism is used for uplink transmission, then resource allocation is controlled and efficient, but transmission latency increases due to scheduling request and grant exchange
Solution Approach 1:
The network pre-configures PUSCH resources for the UE before actual data transmission is needed. This preliminary allocation of time-frequency resources and transmission parameters eliminates the need for real-time scheduling requests and grants, allowing immediate transmission when data arrives, thus reducing latency while maintaining controlled resource usage through predetermined configurations
2Loss of time
If pre-configured PUSCH resources are allocated for all UEs, then transmission latency is reduced, but resource waste increases when data transmission is not needed
Solution Approach 1:
The pre-configured PUSCH resources are designed to be dynamically adjustable. The network can modify the time-frequency resource allocations, transmission parameters, and activation status of pre-configured resources based on actual traffic conditions and channel state, allowing the system to adapt between resource availability and actual transmission needs, thus reducing waste while maintaining low latency capability when needed
3Productivity
If dynamic resource adjustment is implemented for pre-configured PUSCH, then resource efficiency is improved, but system complexity increases due to additional signaling
Solution Approach 1:
The system enables dynamic adjustment of key parameters of pre-configured PUSCH resources, including time-frequency resource allocations, modulation and coding schemes, and transmission power levels. These parameter changes are signaled efficiently through compact DCI formats that modify only the necessary parameters rather than reconfiguring entire resource allocations, thus improving resource efficiency while limiting the increase in signaling complexity
Data Source
AI summary
In order to reduce latency in new radio access technology (NR), a method and apparatus for configuring a pre-scheduled physical uplink shared channel (PUSCH) is proposed. A user equipment (UE) receives a configuration of the pre-scheduled PUSCH from a network, wherein the configuration includes a percentage of resource for the pre-scheduled PUSCH, and transmits UL data via the pre-scheduled PUSCH according to the percentage of resource to the network. Further, the UE receives a dynamic indication of adjusting the percentage of resource for the pre-scheduled PUSCH from the network, and transmits UL data via the pre-scheduled PUSCH according to the adjusted percentage of resource to the network.