Malladi 2003.5, 3.7 GHz 1800. 2100. 2300. maybe even 700 can work just like LAA. Qualcomm, Verizon, and AT&T testing convincingly shows that commercial quality broadband can be delivered today over unlicensed spectrum. The telcos are targeting the Wi-Fi bands and possibly 3.5-4.2 GHz.

The same technology can be used to recover spectrum in licensed bands like 1800 & 2100, Especially in rural areas, massive amounts of licensed spectrum lie fallow. It would be enough, for example, to deliver a true gigabit of rural broadband.

LAA (Licensed Assisted Access) uses a control channel in licensed spectrum. AT&T is rolling it out later this year. That uses a sliver of licensed spectrum as a control channel and connects in other bands for capacity. Qualcomm has a similar system called MultiFire that works for new entrants because it doesn't require licensed spectrum.

Columbia Professor and FCC CTO Henning Schulzrine, believes "All new spectrum would be shared."  Circumstances and estimates vary, but sharing spectrum usually at least doubles capacity.

 

dave askOn Oct 1, Verizon turned on the first $20B 5G mmWave network with extraordinary hopes. The actual results the first four months have been dismal. Good engineers tell me that will change. Meanwhile, the hype is unreal. Time for reporting closer to the truth.

The estimates you hear about 5G costs are wildly exaggerated. Verizon is building the most advanced wireless network while reducing capex. Deutsche Telekom and Orange/France Telecom also confirm they won't raise capex.

Massive MIMO in either 4G or "5G" can increase capacity 4X to 7X, including putting 2.3 GHz to 4.2 GHz to use. Carrier Aggregation, 256 QAM, and other tools double and triple that. Verizon sees cost/bit dropping 40% per year.

Cisco & others see traffic growth slowing to 30%/year or less.  I infer overcapacity almost everywhere.  

Believe it or not, 80% of 5G (mid-band) for several years will be slower than good 4G, which is more developed.

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5G Why Verizon thinks differently and what to do about it is a new report I wrote for STL Partners and their clients.

STL Partners, a British consulting outfit I respect, commissioned me to ask why. That report is now out. If you're a client, download it here. If not, and corporate priced research is interesting to you, ask me to introduce you to one of the principals.

It was fascinating work because the answers aren't obvious. Lowell McAdam's company is spending $20B to cover 30M+ homes in the first stage. The progress in low & mid-band, both "4G" and "5G," has been remarkable. In most territories, millimetre wave will not be necessary to meet expected demand.