OFDMA Subcarrier Multiplexing for MTC and uRLLC Traffic
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Solution Overview
Problem
Current mobile communication systems face inefficiencies in transmitting machine-type communication (MTC) traffic due to increased delay and reduced resource efficiency, especially in 5G standards, where MTC devices compete for resources, leading to collisions and limited support, and require ultra-reliable low latency communication (uRLLC) that cannot be met without separate reservation and resource allocation.
Innovation Solution
The solution involves an apparatus and method that multiplexes broadband traffic and MTC or uRLLC traffic using the same resource by having MTC terminals share a subcarrier with enhanced mobile broadband (eMBB) terminals in an OFDMA system, transmitting data with superimposition without reservation, thereby enhancing resource efficiency and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate RACH resources are allocated for MTC terminals, then MTC devices can access resources through competition, but when the number of MTC devices competing is increased, transmission fails due to collision between MTC devices selecting the same resource
Solution Approach 1:
The patent merges MTC traffic with eMBB traffic by allowing MTC terminals to transmit data on subcarriers allocated to eMBB terminals without separate RACH resource allocation. This combining of traffic types enables MTC devices to utilize existing high-speed data resources, thereby increasing the capacity to support MTC devices while maintaining transmission reliability through the robustness of eMBB resource allocation.
2Reliability
If MTC packets are transmitted through allocated resources after four-stage message exchange, then resource allocation is established, but delay time is increased and resource efficiency is reduced
Solution Approach 1:
The patent applies preliminary action by pre-allocating subcarriers to eMBB terminals in advance, which then become available for MTC traffic transmission. This eliminates the need for MTC terminals to perform separate resource allocation procedures at the time of data transmission, thereby reducing delay while maintaining reliable resource allocation through the pre-established eMBB resource structure.
3Speed
If uRLLC traffic requires ultra-low delay performance of 1 ms or less, then transmission speed must be increased, but separate reservation and resource allocation are required which reduces resource efficiency
Solution Approach 1:
The patent makes eMBB resources universal by enabling them to serve dual purposes: primary eMBB data transmission and MTC/uRLLC traffic transmission. This multi-functionality allows the same subcarriers to be used for both high-speed eMBB communication and ultra-low latency MTC/uRLLC communication, thereby achieving high transmission speed for uRLLC while improving overall resource efficiency through shared utilization.
Data Source
AI summary
Disclosed are an apparatus and a method for simultaneously multiplexing and transmitting a broadband traffic and a machine-to-machine traffic or an ultra-reliable low latency communication traffic using the same resource. That is, according to the present invention, it is possible to enhance efficiency of resources when an eMBB traffic and an mMTC traffic or an uRLLC traffic are multiplexed, by spreading and transmitting intermittent data generated in an MTC terminal with superimposition on a subcarrier resource allocated to an eMBB terminal without reservation on a time axis while sharing a high-speed data resource in an OFDMA system and transmitting an uRLCC terminal requiring a short transmission latency time with superimposition on one symbol on a frequency axis.