Uplink Resource Allocation for Low Latency 5G Communication
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Solution Overview
Problem
Current radio communication systems, particularly in the 5G context, face challenges in achieving both high reliability and low latency, especially when multiple communication terminals transmit data to a base station, leading to potential data collisions and increased latency due to the need for techniques like Automatic Repeat reQuest (ARQ) to avoid errors.
Innovation Solution
A radio communication system and method where a base station allocates unallocated uplink radio resources to new communication terminals based on pre-held information, allowing them to transmit data without prior permission, thereby reducing collisions and latency, and supports real-time high-speed communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If Grant Free Access (GFA) is used to minimize transmission waiting time, then latency is reduced, but data collision probability increases when multiple terminals transmit to the same base station
Solution Approach 1:
The invention divides the uplink radio resources into multiple segments, each assigned to different base stations. When a terminal performs GFA, it selects a base station based on downlink signal quality, thereby segmenting the potential collision domain. This segmentation reduces the probability of data collisions while maintaining the low latency benefits of GFA.
Solution Approach 2:
The invention introduces a spatial dimension to the resource allocation by assigning different uplink radio resources to different base stations. Instead of all terminals competing for the same resources (one-dimensional collision), terminals are distributed across multiple base stations (adding spatial dimension), thereby reducing collisions while maintaining fast access.
2Reliability
If Automatic Repeat reQuest (ARQ) or continuous data transmission is used to avoid communication errors, then reliability is improved, but transmission latency increases
Solution Approach 1:
The invention performs preliminary allocation of uplink radio resources to multiple base stations before the terminal needs to transmit data. The terminal selects a base station based on downlink signal quality and uses the pre-assigned resources, eliminating the need for ARQ retransmissions and reducing latency while ensuring reliable transmission from the start.
3Adaptability or versatility
If uplink radio resources are dynamically allocated to new terminals, then system adaptability is improved, but resource allocation complexity increases
Solution Approach 1:
The base station performs preliminary allocation of uplink radio resources to multiple base stations in advance, storing this information locally. When a new terminal needs to connect, it can quickly select a base station and use pre-assigned resources without complex real-time allocation negotiations, thereby maintaining adaptability while reducing allocation complexity.
Data Source
AI summary
A base station holds information on uplink radio resources which has been allocated to at least one already connected communication terminal for performing radio communication using a high frequency with the base station, receives a notification of participation in a radio communication system from a new communication terminal, and allocates unallocated uplink radio resources using high frequencies to the new communication terminal based on the information on the uplink radio resources when received the notification of participation. The new communication terminal transmits data to the base station by using the allocated uplink radio resources.