NTT DOCOMO has been very active in the past few days conducting 5G field trials towards its commercial 5G use cases. Field trials and measurements are being demonstrated in Tokyo, Japan early November 2017 and will be showcased at DOCOMO’s research and development exhibition Mietekita Chotto Saki no Mirai at the National Museum of Emerging Science and Innovation (Miraikan) in Odaiba, Tokyo from November 9th to November 11th.
Multi-Party 5G Trial for Connected Cars
Jointly with Toyota, Intel and Ericsson, DOCOMO announced the success of an ultra-broadband, 4k-resolution video communications for a vehicle traveling at a speed of 30km/hr. A Toyota vehicle moving with 30km/hr is mounted with Intel® GOTM 5G automotive platform terminal and equipped with a compact onboard antenna head which is specially designed for connected vehicle field trials. The vehicle moved through the radio coverage of multiple Ericsson 5G general NodeBs (gNB). The vehicle could establish 4k-resolution video transmission with 1 Gbps in the downlink and 600 Mbps in the uplink. This successful trial marks the first realistic 5G connected-car use case with multi-vendor interoperability.
More on Hi-Tech vehicles, DOCOMO has partnered also with SONY to conduct a 5G trial towards achieving high definition video communications over 5G networks for a new concept cart. The new concept cart used is developed by SONY and it reaches a maximum speed of 19km/hr.
Overview of New Concept Cart
|Top speed||19 km/h|
|Onboard hardware||Internal||49-inch 4K LCD monitor x 1|
|External||43-inch 4K LCD monitor x 6|
Smartphone-Sized NOMA Chipset-Embedded 5G Device
DOCOMO announced achieving 2.3x increase of the spectral efficiency compared to existing LTE-A systems using a smartphone-sized chipset. In collaboration with MediaTek Inc., DOCOMO conducted a field trial for a small chipset which combined DOCOMO non-orthogonal multiple access (NOMA) technology along with MediaTek multi-user interference cancellation (MUIC). NOMA technology stands for multiplexing users on the power domain, offering one more subspace of additional degrees of freedom (DoFs), rather than conventional time, frequency and spatial DoFs, exist in current LTE systems. The major challenge of NOMA is the multi-user interference which results from the simultaneous user transmissions, especially in the downlink where the transmit power is at maximum.
DOCOMO with MediaTek conducted successfully a multi-user 5G macro deployment with three-phone-sized handsets placed at different locations to be severed from the same gNB on the same time-frequency-spatial resources. The three users could eliminate the multi-user interference and hence, achieve ~ 2.3x spectral efficiency. This way, DOCOMO pushes the 5G standardization efforts towards NOMA implementations to achieve the enhanced mobile broad band (eMBB) requirements.
World-First Ultra-Reliable Low-Latency Communications for 5G
DOCOMO, jointly with Huawei, established the world-first URLLC trial on November 2nd through a 4.5 GHz 5G communication system. URLLC is a key use case for 5G standardization, where over the air latency must be below 1 ms with 0.99999 probability of a successful transmission from the first time. URLLC specifications are however very challenging to satisfy. A revolutionary set of new technologies is combined to achieve such strict requirements. As one framework, different 5G frame numerologies, combined short and long TTI lengths, in resource control channel, punctured and grant free scheduling, and much more. DOCOMO could establish a URLLC communication link with over the air latency less than 1 ms and over distances from 0.8 to 1 Km away from Huawei 5G gNB.
|Status of |
|Distance from |
|Packet size||Actual |
|Stationary||Approx. 0.8 km||200 bytes|| |
|Approx. 1.0 km||100 bytes|
|Approx. 0.3 km to 0.6 km||100 bytes|
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