5G Downlink Resource Puncturing for Mixed-Latency Scheduling
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Solution Overview
Problem
Existing resource allocation methods in next-generation 5G radio access networks struggle to simultaneously satisfy the diverse requirements of enhanced mobile broadband (eMBB), massive machine-type communication (mMTC), and ultra-reliable and low latency communication (URLLC) due to issues with excessive control overhead and coverage enhancement, particularly when subdividing scheduling units in the time domain.
Innovation Solution
A method is introduced where a base station configures a time domain scheduling unit for each user equipment, punctures a part of the downlink data channel resource for one user equipment and allocates it to another, and provides a pre-emption indication signal for the first user equipment to stop data transmission during punctured resources, allowing dynamic resource allocation for URLLC traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the scheduling unit in the time domain is subdivided to satisfy URLLC requirements, then latency and reliability are improved, but control overhead increases and cell throughput decreases
Solution Approach 1:
The time domain scheduling unit is segmented into smaller sub-units to enable fine-grained resource allocation. This segmentation allows the system to allocate resources with precision matching URLLC latency requirements while avoiding the need to subdivide the entire scheduling unit structure, thereby controlling overhead.
Solution Approach 2:
The patent implements dynamic resource allocation where the scheduling unit subdivision is applied selectively based on traffic type. URLLC traffic receives fine-grained subdivided resources while eMBB traffic uses coarser allocations, allowing the system to adapt resource granularity to specific service requirements and avoid uniform overhead across all traffic types.
2Loss of time
If the scheduling unit in the time domain is overly subdivided to satisfy URLLC requirements, then latency is reduced, but cell throughput decreases due to excessive control overhead
Solution Approach 1:
Different levels of time domain resource allocation granularity are applied to different user equipments based on their service requirements. URLLC user equipments receive fine-grained allocations for low latency, while eMBB user equipments receive coarser allocations to maintain throughput, allowing each user to benefit from the appropriate resource granularity.
Solution Approach 2:
The system dynamically changes the time domain resource allocation parameters (such as scheduling unit size and granularity) based on the service type and traffic conditions. This allows optimization of both latency and throughput by adjusting parameters rather than using a fixed fine-grained structure for all users.
3Device complexity
If a unified time domain resource allocation structure is used for all user equipments, then device complexity is reduced, but the ability to satisfy diverse usage scenario requirements deteriorates
Solution Approach 1:
The patent implements a universal time domain resource allocation framework that can serve multiple usage scenarios (eMBB, mMTC, URLLC) through a single unified structure. This unified structure uses configurable parameters and selective application of subdivision techniques to accommodate different service requirements without requiring separate allocation mechanisms for each scenario.
Solution Approach 2:
The resource allocation structure incorporates dynamic configurability where parameters such as scheduling unit size, sub-unit granularity, and allocation patterns can be adjusted based on the active service type. This dynamic adaptation allows a single unified structure to fulfill diverse usage scenario requirements without increasing fundamental system complexity.
Data Source
AI summary
Provided is a method for designing downlink control channel for satisfying requirement of the different usage scenarios from each other in a next-generation/5G radio access network which has been discussed in the 3rd generation partnership project (3GPP). In particular, a method of a base station may be provided for transmitting/receiving data in a next-generation radio access network. The method may include configuring a time domain scheduling unit made up of at least one OFDM symbol for each user equipment, allocating a downlink data channel transmission resource with the time domain scheduling unit for a first user equipment, and puncturing a part of the downlink data channel transmission resource for the first user equipment and allocating the punctured resource to the downlink data channel transmission resource for a second user equipment.