Design and field measurement of TD-LTE nomadic relay and backhaul
Guo Zhi · Scientia Sinica Informationis · 2012
As a feature defined in Release 10 of 3GPP,TD-LTE has the ability to improve the cell edge throughput and expand coverage as well as to provide high speed wireless backhaul link.Ericsson as the technology leader in area built TD-LTE nomadic in-band relay prototype in 2011.For the prototype,the access link is totally compatible with the 3GPP Release 8 specification,which allows using commercial terminals for field measurement of the performance.The nomadic emulated the that the antennas for the UE and eNB are closely located which is one of the appearance of the product in the future where the could be plug-and-play.In this paper,wireless backhaul channel characteristics in various deployment scenarios and the throughput performance are measured when nomadic is deployed.It is found in the measurements that when the UE antenna is directional antenna,the direction of the antenna should be to the large reflections or diffractions.Relay can greatly improve the throughput in NLOS backhaul scenario in poor coverage area from the donor and provide coverage extension for the non-coverage area.The nomadic could be placed at most of the area of the cell edge of the donor cell with moderate backhaul link performance.