598 research outputs found
Achieving Low Latency Two-Way Communication by Downlink and Uplink Decoupled Access
In many scenarios, low latency wireless communication assumes two-way
connection, such that the node that receives information can swiftly send
acknowledgment or other response. In this paper, we address the problem of low
latency two-way communication and address it through proposal of a base station
(BS) cooperation scheme. The scheme is based on downlink (DL) and uplink (UL)
decoupled access (DUDA). To the best of our knowledge, this is the first time
that the idea of decoupled access is used to reduce latency. We derive the
analytical expression for the average latency and verify that the latency
expression is valid with outage probability based on stochastic geometry
analysis. Both analytical and simulation results show that, with DUDA, the
latency can be reduced by approximately 30-60% compared to the traditional
coupled access.Comment: This paper has been submitted to SPAWC 2018. We have added more
descriptions and figure that we could not include due to page limitatio
A queueing approach to the latency of decoupled UL/DL with flexible TDD and asymmetric services
One of the main novelties in 5G is the flexible Time Division Duplex (TDD)
frame, which allows adaptation to the latency requirements. However, this
flexibility is not sufficient to support heterogeneous latency requirements, in
which different traffic instances have different switching requirements between
Uplink (UL) and Downlink (DL). This is visible in a traffic mix of enhanced
mobile broadband (eMBB) and ultra-reliable low-latency communications (URLLC).
In this paper we address this problem through the use of a decoupled UL/DL
access, where the UL and the DL of a device are not necessarily served by the
same base station. The latency gain over coupled access is quantified in the
form of queueing sojourn time in a Rayleigh channel, as well as an upper bound
for critical traffic
Agile 5G Scheduler for Improved E2E Performance and Flexibility for Different Network Implementations
In this article, we present a holistic overview of the agile multi-user scheduling functionality in 5G. An E2E perspective is given, including the enhanced QoS architecture that comes with 5G, and the large number of scheduling relatedoptions from the new access stratum sub-layer, MAC, and PHY layer. A survey of the 5G design agreements from the recently concluded 5G Study in 3GPP is presented, and it is explained how to best utilize all these new degrees of freedom to arrive at an agile scheduling design that offers superior E2E performance for a variety of services with highly diverse QoS requirements.Enhancements to ensure efficient implementation of the 5G scheduler for different Network architectures are outlined. Finally, state-of-the-art system level performance results are presented, showing the ability to efficiently multiplex services with highly diverse QoS requirements.In this article, we present a holistic overview of the agile multi-user scheduling functionality in 5G. An E2E perspective is given, including the enhanced QoS architecture that comes with 5G, and the large number of scheduling related options from the new access stratum sub-layer, MAC, and PHY layer. A survey of the 5G design agreements from the recently concluded 5G Study in 3GPP is presented, and it is explained how to best utilize all these new degrees of freedom to arrive at an agile scheduling design that offers superior E2E performance for a variety of services with highly diverse QoS requirements. Enhancements to ensure efficient implementation of the 5G scheduler for different network architectures are outlined. Finally, state-of-the-art system level performance results are presented, showing the ability to efficiently multiplex services with highly diverse QoS requirements
- …