Scheduling Request Resource Allocation for Low Latency Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving low latency due to the existing radio resource structure, which is not suitable for next-generation wireless communication systems aiming for user plane latency of 1 ms, especially when multiple user equipment (UEs) transmit scheduling requests (SRs) simultaneously, leading to increased system overhead and difficulty in allocating sufficient SR resources.
Innovation Solution
The proposed method involves allocating a first SR resource and a second SR resource with different allocation periods, where the first SR resource has a shorter allocation period and can include both dedicated and common SR resources, allowing UEs to select the appropriate resource for transmitting SRs based on broadcast and UE-specific information, thereby optimizing SR resource allocation and maintaining high success probability of SR reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a single SR resource is allocated to all UEs, then system overhead is reduced, but the probability of SR collision increases when multiple UEs transmit simultaneously
Solution Approach 1:
The patent segments the SR resource pool into multiple dedicated SR resources, each assigned to specific UEs based on their channel conditions and service requirements. This segmentation reduces collision probability by providing separate transmission opportunities for different UEs while maintaining manageable system overhead through selective allocation.
Solution Approach 2:
The patent applies local quality by allocating SR resources with different properties to different UEs - some UEs receive dedicated resources with higher reliability, while others share resources. The allocation considers local UE characteristics such as channel quality, service type, and traffic patterns to optimize the balance between overhead and success probability.
2Reliability
If multiple dedicated SR resources are allocated to each UE, then SR transmission success probability is improved, but system overhead and resource allocation complexity increase
Solution Approach 1:
The patent implements dynamic SR resource allocation where the number and type of dedicated SR resources assigned to each UE changes based on real-time conditions. The base station adjusts allocation dynamically - providing multiple dedicated resources when needed for high reliability, and reducing to fewer resources when conditions permit, thereby managing complexity while maintaining success probability.
Solution Approach 2:
The patent changes allocation parameters such as the number of dedicated SR resources, resource period, and resource type (dedicated vs. common) based on UE-specific conditions including service requirements, channel quality, and traffic patterns. This parameter adaptation allows the system to maintain high success probability without permanently high complexity.
3Loss of time
If SR resource allocation period is shortened to meet low latency requirements, then latency is reduced, but the number of SR resources required increases
Solution Approach 1:
The patent implements periodic SR transmission with configurable periods that can be shortened to meet low latency requirements. By using periodic action with appropriate period lengths, the system achieves fast SR transmission opportunities while the selective dedication of resources prevents the need to provision resources for every possible periodic transmission across all UEs simultaneously.
Solution Approach 2:
The patent creates SR resources that serve multiple functions - dedicated SR resources can be used both for periodic SR transmissions and for aperiodic SR transmissions when needed. This multi-functionality allows the system to meet low latency requirements with fewer total resources, as the same resources fulfill multiple SR transmission needs.
Data Source
AI summary
Provided are a method and a device for transmitting a scheduling request in a wireless communication system. Particularly, user equipment receives information on first and second scheduling request resources which is broadcasted from a base station. The user equipment receives information on the first and second scheduling request resources which is transferred specifically to the user equipment from the base station. On the basis of the information, the user equipment selects the first scheduling request resource or the second scheduling request resource. The user equipment transmits a scheduling request via the selected resource.