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Cellular machine-type communications: physical challenges and solutions
Wang M., Yang W., Zou J., Ren B., Hua M., Zhang J., You X. IEEE Wireless Communications23 (2):126-135,2016.Type:Article
Date Reviewed: Apr 7 2017

Machine type communication (MTC) is an emerging technology with unbelievable penetration in different aspects of human life; wireless communication would play a great role in its implementation. The compatibility and coordination of these technologies have been the origin of wonderful scientific discussions and achievements. In this regard, a category of proposals emphasizes the utilization of available platforms, like long-term evolution (LTE), to embed MTC inside, whereas other ideas insist on establishing other infrastructures for this new technology, like the utilization of cognitive radio mechanisms for MTC.

Message and channeling design issues for embedding MTC in LTE at physical down-link control channels, physical up-link control channels, physical random access channels, and physical data channels are the main topics discussed in the paper.

At down-link, link budget analysis and power consumption analysis are the basic topics of discussion for MTC physical design. The discussion about the first topic is fruitful, but somehow confusing about the relation among transmit power spectral density, disseminated power, and bandwidth. The discussion on power consumption analysis starts nicely, but finishes without any conclusion. The distributed enhanced physical down-link control channel (EPDCCH) mechanism of LTE has been proposed for the machine type PDCCH (MPDCCH). A retransmission mechanism has been considered to gain reliable down-link transmission. Increased total signal energy, increased signal dimension, and increased time diversity have been counted as the advantages of this method.

To combat the narrow-band transmission, reduced transmit power, and single transmission features of MTC devices, at up-link, frequency hopping across the system bandwidth is devised to strengthen the frequency diversity. Multiple transmission is proposed to relieve the issue of up-link link budgets.

Mutual compatible narrow-band transmission of MTC and LTE is emphasized. The link budget for this channel is discussed. Finally, at physical data channels, burst transmission is used in response to negative acknowledge (NAK) instead of HARQ, multiple resource block (RB) allocation for the down-link, and minimum bandwidth dedication for the up-link.

The paper definitely contains worthy discussions concerning MTC in LTE. It is a great and useful resource for becoming familiar with the messaging technique lemmas for LTE. Plenty of valuable comments about down-link and up-link communication can be recognized in the paper. Good diagrams definitely help the reader to understand the topics.

Reviewer:  Mohammad Sadegh Kayhani Pirdehi Review #: CR145179 (1706-0370)
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