D2D URLLC Communication via Frequency-Domain Data Duplication
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Solution Overview
Problem
Current 5G cellular communication technologies face challenges in achieving both high reliability and low latency simultaneously, especially in industrial applications requiring ultra-reliable low-latency communications (URLLC), as traditional redundancy methods increase latency and shared radio resources lead to communication unreliability.
Innovation Solution
The solution involves device-to-device (D2D) communication using multiple separate frequency resources to transmit copies or portions of data, with a preamble indicating urgent reception, allowing other devices to refrain from transmitting during this time, thereby maintaining reliability without increasing latency. This method includes transmitting a preamble in a first time interval, followed by data in the same and separate frequency resources, with a guard period for processing, and optional additional copies or portions in additional resources based on network conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundancy is introduced in space, time, and code domain to achieve high reliability, then communication reliability is improved, but latency increases and overheads increase
Solution Approach 1:
The patent segments the data transmission into multiple copies distributed across different frequency resources (first frequency resource and second frequency resource). By dividing the data into portions and transmitting them simultaneously over separate frequency channels, the system achieves high reliability through diversity without requiring time-domain repetitions that would increase latency.
Solution Approach 2:
The patent transitions from traditional time-domain redundancy (ARQ/HARQ retransmissions) to frequency-domain redundancy. Instead of waiting for retransmissions in the time domain, the system transmits multiple copies of data simultaneously across different frequency resources, achieving reliability enhancement without the latency penalty of sequential retransmissions.
2Loss of time
If low latency is achieved by transmitting whenever data is available, then latency is reduced, but communication reliability deteriorates due to collisions and interference in shared radio resources
Solution Approach 1:
The patent segments the shared radio resource into multiple orthogonal frequency resources. By dividing the frequency spectrum into separate channels (first frequency resource and second frequency resource), the system allows simultaneous transmissions without mutual interference, achieving both low latency and high reliability in the shared medium.
Solution Approach 2:
The patent employs copying by transmitting multiple copies of the same data simultaneously over different frequency resources. This frequency diversity copying approach eliminates collisions and interference that would occur in single-channel transmissions, maintaining reliability while enabling immediate transmission upon data availability.
3Reliability
If multiple copies of data are transmitted over separate frequency resources, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements multi-functionality where the same frequency resources can be dynamically allocated to different purposes. The base station can allocate the first frequency resource for D2D URLLC communication and the second frequency resource for other purposes (D2D or traditional cellular), making the system adaptable and reducing complexity by sharing resources efficiently rather than requiring dedicated separate channels.
Data Source
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AI summary
A first method comprises transmitting (101) a preamble in a first time interval in a first frequency resource, transmitting (103) a first portion or a first copy of data in the first frequency resource in a second time interval, and transmitting (105) a second portion or second copy of the data in a second frequency resource in the second time interval. The second time interval succeeds the first time interval and the second frequency resource is separate from the first frequency resource. A second method comprises listening (111) for transmission of a preamble, transmitting (115) data in a second time interval succeeding a first time interval upon determining that the preamble was not received in the first time interval, and refraining (113) from transmitting data in the second time interval upon determining that the preamble was received in the first time interval.