Coexistence Evaluation of LTE with Active Antenna System

Fei  Xue; Qimei  Cui; Ting  Fu; Jian  Wang

doi:10.4236/cn.2013.53B2041

Fei Xue, Qimei Cui, Ting Fu, Jian Wang

Abstract: Due to the new radio architecture of Active Antenna System (AAS), the LTE BS equipped with AAS will have more flexible RF planning than that equipped with passive antenna. However, the new RF characteristic of AAS will have potential impacts on the existing BS RF requirements, which is imperative to be evaluated. In this paper, general antenna pattern and spatial Adjacent Channel Leakage Ratio (ACLR) are introduced considering the new RF features of AAS, and the impacts of AAS on BS performance are analyzed based on the AAS fundamental applications. System-level coexistence simulation is conducted to evaluate the RF features of transmitter and receiver of AAS on BS performance. Simulation results show that RF feature of spatial ACLR of AAS transmitter has little impact on throughput loss in victim system and ACLR of 45 dB per transmitter of AAS can fully meet the coexistence requirement; RF feature of in-band blocking level of individual receiver of AAS is higher than that of receiver of BS equipped with passive antenna around 1-4 dB, which imposes harder requirement to design the channel selection filter in the individual receiver of AAS, thus in-band blocking requirement needs to be redefined for AAS BS in the existing 3GPP specification.

Keywords: Coexistence Evaluation; AAS; LTE; Spatial Characteristics

Cite this paper: Xue, F. , Cui, Q. , Fu, T. and Wang, J. (2013) Coexistence Evaluation of LTE with Active Antenna System. Communications and Network, 5, 217-222. doi: 10.4236/cn.2013.53B2041.

References

[1] 3GPP, “Overview of 3GPP Release 11 V0.1.4”, Mar.2013.

[2] 3GPP TR 37.840 V0.3.0, “Study of AAS Base Station”, Dec.2012.

[3] 3GPP TR 36.942 V10.3.0, “E-UTRA Radio Frequency (RF) System Scenario,” June.2012.

[4] 3GPP TR 25.816 V8.0.0, “UMTS 900 MHZ Work Item Technical Report,” Sept.2009.

[5] 3GPP TR 36.814 V9.0.0, “Further Advancements for E-UTRA Physical Layer Aspect,” Mar.2010.

[6] O. N. C. Yilmaz, S. Hamalainen and J. Hamalainen, “System Level Analysis of Vertical Sectorization for 3GPP LTE,” IEEE 6 International Symposium On Wireless Communication System (ISSWCS), pp. 453-457, Oct.2009.

[7] 3GPP R4-124171, “On the Down-tilt for 3D Coexistence Simulation,” 3GPP TSG RAN WG4 Meeting#64.

[8] 3GPP R4-122397, “Text Proposal for Simulation Assumptions for AAS,” 3GPP TSG RAN WG4 Meeting#63.

[9] 3GPP R4-123245, “Correction on Composite Array Radiation Pattern for AAS,” 3GPP TSG WG RAN4 Meeting#64bis.

[10] 3GPP R4-123925, “Discussion for Composite Radiation Pattern of AAS”, 3GPP TSG RAN WG4 Meeting#64.

[11] P. C. Kang, Q. M. Cui, S. Chen and Y. J. Liu, “Performance Evaluation on Coexistence of LTE with Active Antenna Array System,” IEEE23rd International Symposium on Personal Indoor and Mobile Radio Communication (PIMRC), pp. 1066-1070, Sept. 2012.