Tuesday 27 June 2023

Ericsson's Massive MIMO Handbook(s)

Sometime last year, Ericsson published a detailed Massive MIMO Handbook, which contains two documents:

  • Massive MIMO Handbook
  • Massive MIMO Handbook – Technology Primer

The main purpose of the Massive MIMO Handbook is to provide a guide for how to use Massive MIMO to meet the performance requirements in a 5G mobile networks. It should also provide a guide for how to choose suitable products in typical network deployment scenarios. The handbook shall also briefly explain key aspects of how Massive MIMO works and how the different technology components affect network performance in field.

This handbook primarily targets the Massive MIMO stakeholders in the communications service providers´ organizations. It can also be used by internal Ericsson organizations.

The document focuses on Massive MIMO solutions, including as a means for meeting the performance requirements in the network. Focus is on products operating with time division duplex (TDD) on mid-band spectrum, typically 3.5-3.7 GHz. Conventional radio solutions are also included as an alternative where Massive MIMO is not needed or not cost efficient. Furthermore, emphasis is on the radio solution, i.e. the radio parts and the antenna parts. To keep the document focused and limited in volume, the baseband solution, site solution other than radio parts and the antenna (e.g. power, enclosure, cooling, etc.), transport solutions (backhaul and fronthaul) are not included. High-band (mm Wave) and FDD are not included in this version. The service in focus is mobile broadband (MBB) as this is the dominating service in all mobile networks.

The purpose of Massive MIMO Handbook – Technology Primer is to provide a deeper understanding to how Massive MIMO works, why it works and what performance is achievable in a real network deployment. Many related topics that provide additional insights to the background of Massive MIMO, e.g. antennas and wave propagation, the implications of Massive MIMO, e.g. architecture and implementation and radio requirements are also covered.

The different chapters of the Technology Primer can be read selectively and standalone to deepen knowledge where the reader chooses. The chapters are however organized in a way that they best are read in succession. For example, the chapters: antennas and wave propagation, antenna arrays, multi-antenna technologies, 3GPP solutions, network performance and Massive MIMO features will be better understood if read in a sequence. If readers has a reasonably good understanding of an area from start, they do not need to read everything in these chapters, and rather selectively read what is important to them.

PDF can be downloaded from here.

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Monday 12 June 2023

Du's Solar Sites in UAE

du mobile telecommunication services, the second largest UAE MNO was launched in February 2007 under Emirates Integrated Telecommunications Company (EITC), a public joint stock company incorporated in Dubai through Ministerial Resolution No. 479 of 2005 issued on 28 December 2005. As of 2021, du has 6.7 million (39%) of UAE mobile subscribers and 236,000 fixed line subscribers.


In their latest sustainability report, du said:

78 sites that run completely on solar panels, helping us save 360 tCO2 during the year

  • Diesel savings of approximately 1.4 million litres/year (a total carbon footprint reduction of 3,714 tCO2/year)
  • Additional 100 solar sites planned for installation in 2023

Surprisingly it is difficult to find how these sites look like. The picture above is from a LinkedIn post by Ibrahim Gedeon. The only other place I have seen these is in this Tweet:

It would be interesting to learn more. If you have more info or know where to find it, please feel free to add the info in the comments below.

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