| 研究課題/領域番号 |
18K11269
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| 研究機関 | 会津大学 |
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研究代表者 |
Anh・T Pham 会津大学, コンピュータ理工学部, 教授 (80404896)
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| 研究期間 (年度) |
2018-04-01 – 2021-03-31
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| キーワード | Massive IoT / M2M Communications / RFID / Distributed Queue / Random Access Protocol |
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| 研究実績の概要 |
Long-Term Evolution cellular networks are the main enabler for the massive Machine-Type Communications service and must therefore handle a huge number of Machine-Type Devices (MTDs). To control the number of devices that are allowed to contend on the Physical Random Access Channel (PRACH), the Group Paging scheme that divides the MTDs into smaller groups and let the network sequentially trigger the groups has been studied. However, since the number of PRACH preambles is limited, the group’s size must be kept relatively small compared to the MTD population. In this project, we exploit the possibility that a significant portion of MTDs is also covered by densely deployed small-cells such that a small-cell base station (SBS) may act as a representative for its MTDs during the preamble transmission step to reduce the load on PRACH. Once the SBS succeeds, its MTDs then contend locally to send their own signaling messages on the corresponding reserved uplink resources. Computer simulations show that the manageable group size can be significantly increased at a reasonable cost on the Physical Uplink Shared Channel. A theoretical model to quickly predict the effect of the ratio of MTDs that are under the coverage of the SBSs is also derived and verified.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The project progressed more smoothly than initially planned thanks to the fact that we can quickly recruit research assistants (PhD students) and therefore, can start the project early. We also maintain the project progress weekly meeting to confirm work status and quickly address any arising issues.
With these facts and situations, the project is progressed rather smoothly, especially in the first year (AY2018), in terms of both research implementation and result dissemination. In the second year, the project is still progress smoothly. Howver the result dissemination is a bit delayed due to the reviewing process. We expect that the publication record would be much improved in the next academic year (2020).
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| 今後の研究の推進方策 |
We continue working on improving the design and thus, the performance in terms of both energy efficiency and delay, of both the newly proposed DQ-based random-access protocols for MTC devices and the identification protocols. From the AY2020, we exloit a new concept of Virtual Small Cells (VSCs) to solve the radio access network (RAN) overload issue in the group-paging process caused by the massive access of the IoT networks.
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