Showing posts with label Operator China Telecom. Show all posts
Showing posts with label Operator China Telecom. Show all posts

Tuesday, 30 June 2020

QCell - ZTE’s 5G Solution for Gigabit Indoor User Experience

ZTE unveiled its 5G RAN product portfolio for the 'Networks of the Future' back in February, just in time for the MWC that was unfortunately cancelled. One of the products was QCell.

ZTE’s QCell 5G indoor solution provides not only multi-mode, multi-frequency, ultrawide-bandwidth and large-capacity 4TR products, but also a more budget-friendly 2TR product that supports 300 MHz bandwidth, which is ideal for indoor RAN sharing and rapid introduction of 5G with lower deployment cost.



Yesterday, ZTE announced that along with the Jiangsu branch of China Telecom, they have deployed 5G 200 MHz Qcell 4T4R digital indoor distribution system in the indoor scenarios with high amounts of data traffic, such as shopping malls and subway stations, in Xuzhou, China. The system provides high-quality 5G indoor coverage, and accelerates future 5G indoor system deployment.


This commercial deployment has employed ZTE’s latest 5G Qcell ultra-wideband product series, which supports 200MHz continuous ultra-large bandwidth at 3.5 GHz frequency band, and 100MHz+100MHZ dual-carrier aggregation technology that doubles download rate. 

For the time being, by virtue of China Telecom’s 100MHz 5G bandwidth, the single 5G user download rate has turned out to exceed 1 Gbps. In case of the activation of 200 MHz bandwidth in the future, the single 5G user download rate will exceed 2 Gbps, providing an excellent 5G experience. 

Moving forward, ZTE will give full play to its technical and commercial advantages in the 5G field, continue to work closely with China Telecom to build high-quality 5G digital indoor networks, and develop 5G industrial applications, thereby facilitating the development of smart cities.

A partner feature on Mobile World Live provides a lot more technical details:

The ZTE QCell system consists of pRRU/pBridge/BBU (Baseband Unit) 3-level equipment. The 3-level efficient architecture supports the rapid cabling of CAT6a network cables or optical-electrical hybrid cables. It supports pBridge multi-level cascading, cell splitting and combination, and can rapidly respond to the operator’s requirements for the complex networking of different frequency bands and systems, rapid adjustment and flexible expansion of capacity and coverage.

The 300 MHz large bandwidth products with multi-mode and multi-frequency band enable the ZTE QCell solution the powerful network architecture integration capability, to meet the requirements of multi-operator’s co-building and sharing and have the compatibility and adaptability of global deployment. It not only supports the overlay networking of the existing DAS and 5G QCell, but also supports the feed-in of the GSM/UMTS DAS RF signals from different manufacturers in the existing network through the MAU, to protect the operator’s existing indoor distribution investment and introduce value-added services based on 5G coverage and precise positioning. QCell supports GSM/CDMA/UMTS/FDD LTE/TDD LTE/5G NR, which makes once deployment to implement the multi-operator/multi-band/multi-system indoor distribution system that achieves agile, long-term, co-construction, sharing, and lowest cost indoor distribution network, multi-system equipment and common management and maintenance. It only needs software upgrade for service expansion and network architecture evolution in the future so as to protect the investment in early-stage 5G indoor deployment and reduce the overall TCO cost from the perspective of long-term operation.

ZTE adopts innovative design of QCell products to reduce the cost and power consumption of equipment units. The pRRU transceiving channel not only supports high-performance 4T4R, but also supports low-cost 2T2R, further reducing the cost and power consumption. The pBridge enhanced product is designed to reduce the cost and power consumption after the electrical interface and optical interface are separated and the SoC solution is introduced. Moreover, the simplest BBU product is introduced to further reduce the QCell system networking cost.

The hierarchical QCell networking well matches diverse scenarios

Based on the analysis of the requirements for indoor distribution of operators, vertical industry enterprises, and large business owners, the indoor distribution scenarios can be divided into three types: capacity-sensitive scenario (type A), capacity and coverage balancing scenario (type B), and coverage-sensitive scenario (type C).

For the above three types of scenarios, ZTE provides hierarchical QCell networking solutions. Compared with the Benchmark QCell solution of 4T4R built-in antenna pRRU, ZTE provides a cost reduction solution of 2T2R built-in antenna pRRU and a low cost solution of 4T4R pRRU+ connected with external DAS antenna according to the scenario requirements, thus achieving the accurate network construction and saving operators’ investment. Evaluations based on the 40,000 square meters isolated indoor distribution scenario show: for scenario type B, the total main equipment investment is reduced by about 1/4; for scenario type C, through the external DAS antenna, the single-pRRU coverage area is greatly expanded and the overall investment is greatly reduced by about 1/2.

Extensive QCell Digital Smart Indoor Application, Making 5G Service Ubiquitous

The QCell digital intelligent indoor distribution system can be deployed for indoor and semi-indoor to achieve wireless coverage and service provision in high-value areas, such as large traffic hub, large stadiums, CBD and university campuses.

The large-scale traffic hub scenarios, such as airports, railway stations, and subway stations, have a large area and high population density, and are high-value areas for operators to guarantee both coverage and performance. The Wi-Fi system of most transportation hubs is often limited in capacity and cannot meet passengers’ requirements for future 4K/8K HD video. In Changsha Huanghua Airport, ZTE deployed the indoor high-capacity digital intelligent QCell solution with high-density networking and the first 3-carrier aggregation technology in China, to achieve the throughput of 8400Mbps for the airport. The solution supports 3,500 people simultaneously to enjoy HD video smoothly. At present, the QCell solution has been widely used in various metropolitan airports and railway hub stations, including Changsha Airport in Hunan, Xiaoshan Airport in Hangzhou, Nanjing South Station and Xining Railway Station, serving millions of passengers. Nanjing South Railway Station has a total building area of 45.8 million square meters, which is the largest railway station in Asia. After QCell is deployed, the SINR is increased by 13% and the throughput is increased by 91.8%.

The large stadiums, such as stadiums and exhibition halls, have a large number of users and a huge amount of data volume in a centralized manner. The QCell solution supports vertical partitioning to achieve seamless multi-layer coverage from the upper stands, the middle mezzanines to the bottom passages. At present, the QCell solution has been widely deployed in large stadiums such as Hangzhou Olympic Center, Hangzhou Expo Center, Suzhou International Expo Center, and Shenzhen New High-Tech Center. In August 2019, the ZTE 5G Smart Digital Indoor Division QCell solution covered many important sports venues including the Main Conference venue of the Red Lantern Stadium for the second National Youth Games (Shanxi), and made the Game the first “5G Games” in China. Through such technologies as MEC deployment and low delay coding, the ZTE 5G Smart stadium solution reduces the end-to-end live broadcast delay to 1 second, and provides audience with the excellent experience comparable to watching on the spot. In addition, ZTE also provides audience with brand-new experience in three 5G scenarios: immersive viewing experience from multi-angle live streaming, “Flexible Zooming” and “360-degree Free View” services. As an iconic application in the Game, the 5G Smart Stadium Solution provided an excellent demonstration for the live broadcast of sports events.

A recent promo video of QCell is embedded below:




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Monday, 27 April 2020

Huawei's 5G Book RRUs Start Delivering On Their Promises

We have blogged about Huawei's Book RRUs last year here. Now, Huawei and China Telecom Shenzhen (a.k.a. Telecom Shenzhen) have taken the lead in achieving the global ultra-large scale 3D networking that involves macro and pole base stations in China. Hundreds of 5G C-Band (3.4 - 4.2 GHz) Book RRUs were used to help the operator deliver an undifferentiated experience in 5G-covered areas.

Huawei announced in a press release:

Book RRU is an innovative product that is small in size, lightweight, and easy to deploy. This offers an effective approach of addressing challenges associated with insufficient site resources. 5G Book RRUs enable significant improvements in 5G in-depth coverage and user experience in residential areas while increasing network capacity.

In-depth coverage in residential areas, urban villages, upscale communities, and backstreet alleys is a long-standing challenge which has faced operators. Insufficient resources and difficult acquisition lead to difficult and time-consuming site deployment.

Lightweight 5G Book RRUs enable quick 5G deployment in residential areas by using walls, lamp poles, monitoring poles, and electricity poles as sites. This offers a quick solution to achieving quick deployment, helping eliminate coverage holes and offload network traffic.

In December 2019, China Telecom Shenzhen completed the deployment and verification of the first 5G Book RRU. 4T4R 5G Book RRUs were used in the project.

After the recent 5G Book RRU deployment, tests show showed that the downlink speed exceeds 1.2Gbps on commercial mobile devices (Mate30 Pro) when the network spectrum is 100 MHz. With Book RRU deployment, coverage holes 150 to 200 m away from streets are eliminated and indoor in-depth coverage of low-rise buildings standing 50 m to 100 m above the ground is achieved.

This places the operator in a unique position to meet the capacity requirements in value hotspots in Shenzhen, such as school campuses, office buildings, business districts, and scenic parks. Book RRUs supplement macro base stations with in-depth coverage and hotspot capacity absorption. This improves user experience and releases suppressed traffic while also increasing ROI.

Shenzhen Telecom is the pioneer of digital construction. Under the overall construction plan of the new infrastructure construction China Telecom Shenzhen will continue to collaborate with Huawei to complete quick 3D networking based on 5G standalone (SA) technologies through combined deployment of macro, pole, and indoor products, enabling optimal user experience while securing 5G leadership.
Picture Source: Susan Welsh de Grimaldo

Last year, Huawei gave a tour to analysts in Zurich, Switzerland to show their kit on Sunrise's network. This tweet from analyst Kester Mann, shows two examples of Book RRU deployments for Sunrise network in 3.7 GHz spectrum with local coverage up to 200 metres and speeds recorded above 700 Mbps with 9 milliseconds of latency.




With operators have to provide dense coverage to meet the 5G expectations, we won't be surprised to see more products like these in the near future.

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Saturday, 13 April 2019

China Telecom's PON based Small Cells backhaul to reduce CapEX and OpEX


GSMA has a network economics case study from China Telecom on their future networks website. This case study focuses on the challenges of CapEX and OpEX of small cell backhaul. For coverage and/or capacity enhancement purpose, small cells will be deployed widely in the future. As the number of small cells deployed increases, larger bandwidth and higher flexibility are required for the backhaul transportation, which consequentially leads to higher CapEX and OpEX. Therefore an economic and practical approach has to be put forwarded and verified.

China Telecommunications (CT) is one of the largest state-owned telecommunication companies in China. With the world’s largest broadband Internet network, Frequency Division Duplex – Long Term Evolution (FDD – LTE) mobile network, China Telecom is capable of providing cross-region, fully integrated information services to global customers through its sound customer service channel system.

In this case study, CT proposes a small cell backhaul based on Passive Optical Network (PON) system, which can reduce at least 80% of the trunk fibre and 50% of associated fibre. As a result making facility room and air-conditioning unnecessary. Therefore the CapEX and OpEx of small cell deployment could be reduced effectively and remarkably.

As networks evolve through 4.5G to 5G with more complexity, network densification and intelligence at the edge, the need will be even greater to optimise transport network architecture within mobile Radio Access Network (RAN) to resolve the challenges of backhaul/fronthaul demand and the corresponding increase in costs (CapEX and OpEX).

Key highlights of the case study:
  • Small cell backhaul based on Passive Optical Network (PON) system is proposed, which can reduce at least 80% of the trunk fibre and 50% of associated fibre and facility room and airconditioner are no longer required.
  • China Telecom has conducted laboratory and field test in Hubei City and Shanghai with Huawei and ZTE. The test results proved the feasibility with equipment and performance KPI’s satisfied.
  • Backhaul based PON could be one of the preferred choices for small cell backhaul transport. 
CT selected seven outdoor sites and one indoor site in Hubei, and eight outdoor sites in Shanghai. All the small cells were linked to EPON (Ethernet Passive Optical Network) equipment, which had been updated (software and hardware) to support frequency and time synchronisation. Detailed information about CBUs (Cellular Backhaul Units) and small cells in CT laboratory can be seen in the picture above and more details are provided in the case study.

The case study is available here.


Chengliang Zhang, Vice President of China Telecom Beijing Research Institute, China talked about "Optical Networking in the Cloud and 5G Era" which is embedded below.


Saturday, 8 August 2015

Case Study: Deploying small cell backhaul in China


Came across this old presentation (embedded below) by CCS (Cambridge Communication Systems Limited) of small cell backhaul deployment in China. Having looked at their website they do have regular updates for different deployment. Here is one with China Mobile and here is another one from China Telecom. Interested readers can also read their regular updates here.

Here is their presentation from Small Cells World Summit (Backhaul Summit) from last year: