| 1. |
- Jalili, Leilia, et al.
(författare)
-
Efficient traffic offloading for seamless connectivity in 5G networks onboard high speed trains
- 2017
-
Ingår i: IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC. - : IEEE. - 9781538635315 ; , s. 1-6
-
Konferensbidrag (refereegranskat)abstract
- Seamless wireless connectivity in high mobility scenarios (≥ 300 km/h), is one of the fundamental key requirements for the future 5G networks. High speed train (HST) is one of the preferred mid-range transportation systems, and highlights the challenges of providing wireless connectivity in high mobility scenarios for the 5G networks. Advanced version of Long Term Evolution (LTE-A) from the Third Generation Partnership Project (3GPP) with peak data rate up to 100 Mbps in high mobility scenarios paved the road toward high quality and cost effective onboard Internet in HSTs. However, frequent handovers (HO) of large number of onboard users increase the service interruptions that in turn inevitably decrease the experienced quality of service (QoS). In this paper, according to the two-tier architecture of the HST wireless connectivity, we propose a novel and practically viable onboard traffic offloading mechanism among the HST carriages that effectively mitigates the service interruptions caused by frequent HOs of massive number of onboard users. The proposed architecture does not imply any change on the LTE network standardization. Conclusions are supported by numerical results for realistic LTE parameters and current HST settings.
|
|
| 2. |
- Parichehreh, Ali, et al.
(författare)
-
LTE as a Road Toward 5G: QoS Analysis in Mobility Scenario Using The Monroe Platform
- 2019
-
Ingår i: IEEE Wireless Communications and Networking Conference, WCNC. - : IEEE. ; , s. 1-7
-
Konferensbidrag (refereegranskat)abstract
- Seamless wireless connectivity and low latency com- munication in mobility scenarios are two fundamental require- ments in the fifth generation networks to effectively cover a broader range of use cases such as massive machine type communications and ultra-reliable low-latency communications for new industrial/potential users, as well as enhanced mobile broadband for conventional users.In this paper, we aim at measuring certain key performance indicators in mobility scenarios, highlighting some practical inefficiencies that require more careful consideration when de- signing and enhancing mobility features of 5G networks. We investigate the round trip time, uplink throughput and the impact of handover interruption time on these metrics. Our results are based on three months experiment campaign in a mix of rural, suburban, and urban environment using the geographically distributed MONROE platform. Based on the observed discrep- ancies between measured and standardized LTE performance, we conclude the paper with a discussion of techniques that may need more attention for mobility scenarios in fifth generation mobile networks.
|
|
| 3. |
- Parichehreh, Ali, et al.
(författare)
-
Measurement Analysis of TCP Congestion Control Algorithms in LTE Uplink
- 2018
-
Ingår i: 2018 Network Traffic Measurement and Analysis Conference (TMA). - New York : IEEE. - 9783903176096 ; , s. 1-8
-
Konferensbidrag (refereegranskat)abstract
- The unprecedented growth of user generated con- tents yielded by the proliferation of social networks applications, cellular based video surveillance and device-to-device (D2D) communication, makes the cellular uplink communication an attractive topic. In this paper we conduct a systematic evaluation and measurement analysis to characterize cellular uplink traffic and compare its interplay with different TCP congestion control algorithms (CCA), namely NewReno, Cubic, and BBR, in both stationary and mobility scenarios. The evaluation encompasses average throughput, average round trip time (RTT), fairness among simultaneous flows, and packet retransmission. The in- tended behavior of BBR has been observed in LTE uplink, but some severe issues such as lack of fairness among simultaneous flows and massive on device packet losses have been observed. It is observed that the lack of fairness among simultaneous flows can unpredictably change the throughput of multi-flow applications.
|
|
