Uplink Resource Pool Segmentation for URLLC and eMBB
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Solution Overview
Problem
Future wireless networks, such as 5G, face challenges in efficiently utilizing uplink resources while maintaining strict latency and reliability requirements for ultra-reliable low latency communications (URLLC) services, especially when other services like enhanced mobile broadband (eMBB) share the same resources.
Innovation Solution
The implementation of a flexible resource allocation unit in base stations and terminal devices, which includes a resource pool for contention-based URLLC transmissions, dynamically adjusts resource allocation based on monitored traffic patterns and collision probabilities to prioritize URLLC services while allowing eMBB to use shared resources when URLLC is not needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink resources are shared between URLLC and eMBB services, then resource utilization efficiency is improved, but collision probability increases and URLLC reliability deteriorates
Solution Approach 1:
The uplink resource pool is segmented into two parts: a first part reserved for URLLC transmissions and a second part for eMBB transmissions. This segmentation allows URLLC to have dedicated resources for low-latency reliable communication while eMBB can utilize the remaining resources, thus resolving the contradiction between resource utilization efficiency and URLLC reliability by preventing collisions through spatial separation of resources.
2Reliability
If dedicated resources are allocated for URLLC transmissions, then URLLC reliability is improved, but resource utilization efficiency deteriorates when URLLC traffic is low
Solution Approach 1:
The size of the first resource pool dedicated to URLLC is dynamically adjusted based on monitored collision probabilities and traffic conditions. When collision probability exceeds a threshold or URLLC traffic increases, the first pool size is increased to ensure reliability. When collisions are rare and URLLC traffic is low, the first pool size is reduced to allow more resources to be allocated to eMBB, thus dynamically balancing URLLC reliability with overall resource utilization efficiency.
3Loss of time
If resource pool size for URLLC is increased, then URLLC low latency is improved, but resource utilization efficiency for eMBB deteriorates
Solution Approach 1:
The system changes the parameter of the first pool size based on monitored collision probabilities and traffic conditions. By adjusting this parameter dynamically, the system ensures that sufficient resources are allocated to URLLC to maintain low latency when needed, while allowing the second pool size to expand and improve eMBB resource utilization when URLLC demands are low, thus resolving the contradiction between URLLC latency and overall resource utilization efficiency.
Data Source
AI summary
To efficiently use uplink resources while fulfilling latency requirements of low latency services, an access node, a resource pool allocated for contention based transmissions of low latency communication services may be used for transmissions of data services, since an access node providing the resource pool, is caused to send, in response to not being able to decode terminal device identification information from a sensed scheduling request, a stop instruction to terminal devices that are using the resource pool to transmissions of the data services. Further, the terminal device that sent the scheduling request is caused to use the resource pool for transmissions of the low latency service if a response is not received within predetermined time.