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Hi3G to Lead the LTE Convergent Era

The world has witnessed the remarkable achievements made by the European telecommunications industry. Up to now, the European operators have won half the seats among global high-end operators. Europe is usually the pioneer in adopting new technologies and businesses.

Hi3G is ranked the fourth in the market share in Sweden and Denmark. At present, its competitors have deployed LTE networks in the Nordic market, which cause great impact on the 3G development of Hi3G. Therefore, it is very imperative for Hi3G to launch LTE.

While manyhigh-endoperators adopt the traditionalFDD mode, Hi3G believes that after FDD and TDD standards converge, TDD will not only help build a network with the same quality as FDD, but also have cost advantages, for example in spectral resource. Therefore, building TDD/FDD LTE dual-mode networks is the best choice for operators. In addition, with only 2 x 10MHz in 2.6GHz band awarded for FDD in both Sweden and Denmark, Hi3G will not be able to provide competitive data throughput in hotspots. Fortunately, the use of TDD/FDD LTE hybrid networking can provide high-rate services and take advantage of the existing spectral resource according to the service type.


In Sep 2010, Hi3G issued tender documents, requiring all vendors to provide an LTE TDD/FDD dual-mode networking solution. In this solution, interoperability between TDD/FDD LTE and Hi3G’s existing UMTS should be implemented. Moreover, the FDD LTE network should provide wide coverage, both TDD and FDD should be applied in the same hotspots, and later, the TDD LTE network should be further expanded in hotspots. Last, the entire convergent network must be completed within three months from equipment delivery to installation and commissioning.



Figure 1 Application Scenario of TDD/FDD Multi-Mode, Multi-Frequency Networking


At the early stage of bidding, Hi3G selected two suppliers to roll out LTE in Sweden and Denmark. As the project proceeded, ZTE finally stood out in the competition by virtue of its advanced LTE TDD/FDD dual-mode solution, multi-mode SDR platform, diversified BS forms, customized transmission solutions, leading multi-mode terminals, powerful delivery and logistics. In March 2011, Hi3G selected ZTE as the exclusive vendor to deploy LTE.


While meeting the requirements for interoperability and load balancing between hi3G’s existing 3G network and LTE network, the TDD LTE/FDD LTE/UMTS multi-mode convergent networking solution provided by ZTE effectively improved system security and stability, and hence ensured the network throughput in hotspots. By sharing the existing resources including BBU, antenna, GPS, transmission, OMC and EPC, the LTE TDD/FDD dual-mode convergent network not only helped Hi3G to reduce site investment and network maintenance cost, but also accelerated the network construct speed.



Figure 2 Topology of LTE TDD/FDD Dual-mode Networking


Specific to the system interference concern caused by co-site of TDD LTE, FDD LTE and UMTS networks, ZTE offered a co-antenna solution, which won high recognition from Hi3G. In this solution, ZTE adopted 2-path broadband antennas to effectively relieve interference of TDD LTE to FDD LTE through antenna isolation and customized combiners.



Figure 3 ZTE’s Co-Antenna Solution (Applied in Sweden)


It is known that hotspots have high requirements for network throughput. Besides, Hi3G has limited site resource and hoped to make use of the existing UMTS network site. Moreover, the winter temperature is very low in Sweden and Denmark. Therefore, very high requirements are put on the base stations in terms of capacity, size, installation flexibility and performance. In response to that, ZTE provided diversified LTE base stations to completely satisfy the customer’s site requirements with good performance even at the temperature of 40° below 0. In this project, by adopting different combinations of ZTE’s FDD/TDD dual-mode SDR base stations, small-capacity outdoor BBU cabinet, large-scale outdoor cabinet and outdoor distributed base stations, the eNodeB system can be conveniently installed indoors, outdoors, mounted on a tower, under a tower or even installed with no equipment room. As a result, the eNodeB removed the need for extra civil engineering expenditure, decreased the engineering installation difficulty, and hence accelerated network construction for Hi3G.


As a global pioneer in 3G, Hi3G is of course unwilling to lag behind in the field of 4G network operation. For operators, failure to put a network into commercial use on time not only leads to a tremendous loss of revenue, but also runs the risk of lagging behind the competitors. By providing diversified terminals and rapid network construction, ZTE can help Hi3G to achieve fast commercialization of LTE.


On the terminal side, ZTE launched the world’s first Qualcomm chipset based data cards. By supporting 3G, TDD LTE and FDD LTE systems simultaneously, these data cards will help Hi3G to commercialize its LTE network rapidly in terms of business model.

On the engineering delivery side, aimed at “global leader in delivery”, ZTE has set up professional project management processes and teams from site acquisition to civil engineering, equipment installation and equipment room maintenance. Hi3G was very satisfied with ZTE’s standardized project operation and high-quality delivery.


Peder Ramel, CEO at Hi3G, said, “We have chosen ZTE for additional 3G 900/2100 rollout and for LTE mobile broadband networks in Sweden and Denmark because of the possibility to house three different mobile standards in the same physical infrastructure and the low cost of ownership. Furthermore, ZTE advanced LTE dual-mode solutions and quick consignment responses really meet our requirements.”

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