Columbia Harish chipWithin the year, hoping to increase fixed wireless speeds 50+%. Telecom Italia deployed a Kumu unit in Turin for LTE backhaul using the full duplex bandwidth. The 3GPP standard has included "LTE Relay" since 2009 but that hasn't been practical. Qualcomm is sampling the Snapdragon 820 Cat 12 LTE chip, capable of 600 megabits. TI thinks they've found a backhaul solution. 

World-leading engineers believe wireless capacity will grow at least 50x in coming years. They include Marconi Prize winners Marty Cooper, Arogyaswami Paulraj, Henry Samueli and Vint Cerf. MIMO will yield at least a 10X improvement. AT&T and Verizon both have enough unused spectrum to double or triple current LTE capacity. Full duplex has the potential to double everything, and the researchers are confident of at least a 50% improvement most places. Back of the envelope, I believe a 25X increase in wireless capacity is possible without raising capital spending. 

Sending and receiving signals over the same frequency at the same time required calculations beyond the available chips. Moore's Law now makes it practical to minimize the interference between the upstream and downstream signals. Joel Brand of Kumu expects results soon, especially in fixed wireless. With millions in the U.S. soon to lose wired choices, pushing capacity is necessary to bring affordable service with 100 gigabyte+ caps.

 "By the second half of 2016, we could ship full-duplex solutions for infrastructure applications where the requirements are a bit more relaxed than in a mobile phone." I reported a while back they had believers at Deutsche Telecom and SKT. Legendary Stanford Professors Paulraj and McKeown are involved. Their new $25M funding round includes Cisco and Verizon. 

Stanford Professors Phil Levis, Sachin Katti and their graduate students proved this works in the lab. They formed Kumu to make it commercial. Columbia's Harish Krishnaswamy has testable chips. Teams around the world are racing to market.

Telcos are far more worried about selling the capacity coming than about things like spectrum shortages. 

Telecom Italia carried out in Turin the world's first test of “Full Duplex Relay”, which can double the capacity of the LTE network in view of 5G

Tim was the first in the world to test the Full Duplex Relay technology which doubles the transmission capacity of the current LTE network and in the future that of 5G.

<>The test, carried out in the vicinity of the city of Turin, in collaboration with the American start-up Kumu Networks, enabled the self-backhauled small cell 4G with Full Duplex technology solution to be tested in a live environment, thanks to which a smart repeater is capable of transmitting and receiving a mobile signal on the same frequency, thereby doubling the transmission capacity of the network.

This solution will allow mobile transmissions in downlink and uplink to travel at the same time, even if of different intensities, and it is also applicable on the current 4G networks with the use of small cells in areas where there is no traditional backhaul solution available.

Kumu Networks has developed this innovative technology which allows the self-interference of the mobile signal to be overcome and the efficiency of the radio spectrum to be doubled.  Full Duplex is in fact recognized at international level as one of the most important and promising systems to enable the 5G network. The testing was first demonstrated last June in a laboratory in Turin, at TIM's TILab.

We are very happy to announce this first "live" test. TIM has once again shown its ability and commitment to contributing to continuous global innovation, and confirmed its leadership position in research and development on new generation ultrabroadband - declares Gabriela Styf Sjoman, Head of TIM’s Engineering & TILAB 5G is a key network evolution towards more advanced Digital Services and we are not only committed to defining the standards, but also to contributing to key research and development initiatives that will be fundamental for a healthy eco-system in Digital Services, including the network, open platforms and services. Turin is fundamental in contributing to the research of such eco-system and once again capital of innovation thanks to the collaboration with the universities and some of the most advanced sector companies".

From 2020 5G will introduce new services to the market, not only for person to person communications but also for communication between the millions of sensors connecting things to the Internet.  5G technology is characterized not only for its speed which in the future will be able to reach maximum peaks in the order of tens of Gbit/s (hundreds of times greater than 4G), but also for its capacity to connect up to hundreds of thousands of devices per square kilometre with extremely low latency, to the millisecond.


Rome, 22 January 2016


Global Tier 1 Mobile Operators and Equipment Manufacturers Back Critical New Wireless
Breakthrough That is Redefining Spectrum Use and Capability
SUNNYVALE, Calif., January 20, 2016: Full Duplex inventor Kumu Networks today announced it has 
secured $25 million in a Series C funding round from Cisco, Verizon Ventures, Deutsche Telekom
Strategic Investments, and Swisscom. A powerful new development that doubles the capacity of existing 
wireless spectrum, Kumu Networks’ Full Duplex technology is being explored as an enhancement to 
existing LTE deployments and as a potential addition to next generation 5G standards. Previous 
investors NEA, Third Point Ventures and Khosla also joined the round.
“Kumu Networks’ Full Duplex technology is a rare technological breakthrough that offers substantial 
benefit to a multitude of wireless modalities,” said Rachid El Hattachi, SVP Architecture and Blueprints at 
Deutsche Telekom. “Full Duplex offers significant advantages and removes roadblocks from wireless 
endeavors as diverse as LTE Advanced, general Radio Frequency planning and future standards and 
protocols. We jumped at a chance to invest in and help foster this important new technology.”
Kumu Networks’ Full Duplex technology cancels self-interference allowing a radio for the first time in 
history to transmit and receive at the same time on the same frequency. By eliminating the "unwanted" 
energy that leaks into a radio's receiver while transmitting, Full Duplex is able to double the spectral 
efficiency of wireless systems - an economic value of trillions of dollars – and has also been identified as
a foundational technology that will address some of the critical challenges facing next generation 
“We are honored to have such a broad coalition of investors participating in our Series C funding,” said 
Kumu Networks CEO David Cutrer. “The diverse group of investors highlights the broad reach and 
economic potential of our solution and its massive impact on multiple arenas within the wireless 
Full Duplex and Self-Interference Cancellation technologies have the potential to double spectral 
efficiency in any wireless setting. Even in current LTE networks, these technologies facilitate the 
introduction of In-Band Full-Duplex Relay Nodes that allow operators to cost-effectively densify their 
network while leveraging their own LTE spectrum for backhaul. Such network densification is the key to 
addressing the ever increasing demand for wireless data. 
Kumu Networks currently has field tests, trial deployments or research partnerships with a broad array 
of global Tier 1 wireless carriers including Deutsche Telekom, SK Telecom, Telefonica, and TIM. The 
Series C funding will be used to further develop and deploy Kumu Networks’ core product lineup.
“Full Duplex technology can simplify difficult network expansion tasks and increase spectral efficiency,” 
said Vijay Doradla, director at Verizon Ventures. “We look forward to Kumu Networks’ continued growth 
as they seek to commercialize their technology for near-term applications in the wireless ecosystem.”
About Kumu
Kumu Networks was formed by Stanford University professors and PhD graduates. The team has 
succeeded to challenge some of the basic assumptions in wireless technology by building a full-duplex 
wireless system that can transmit and receive on the same frequency at the same time, doubling 
spectral efficiency! The solution is based on software-controlled self-interference-cancellation 
technology that eliminates the need for FDD or TDD duplexing. In addition to its potential for 5G 
standards, the technology can be used to improve spectrum reuse and remove limitations of hardware-based filters in existing systems. For more information, please visit or email 

dave ask

@analysisbranch for latest updates


Welcome  Asia is installing hundreds of thousands of 5G radios and adding 5G subs by the tens of millions. The west is far behind. 200,000,000 in 2020

The demand is there, and most of the technology works. Meanwhile, the hype is unreal. Time for reporting closer to the truth.

I'm Dave Burstein, Editor. I've been reporting telecom since 1999. I love to hear from readers and say thank you when you find an error.

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