Additional Hardware Required with XAir2 LTE

The complete XAir2 LTE UE simulation solution requires several other hardware and software components. The additional hardware items are listed in the table below.



Ixia Part Number

Connection Kit

LTE Access XGS Connection Kit. One connection kit is required for every chassis with an XAir2 module present.



LTE Access 6GHz Wideband Radio


Radio Connection Enclosure

LTE Access Radio Connection Enclosure (RCE) Standard 700MHz-2700MHz


LTE Access Radio Connection Enclosure (RCE) High Band 1000MHz-3900MHz



The XAir2 Module is connected to the eNodeB device under test (DUT) through a radio frequency (RF) connection provided by the Ixia 6GHz Wideband Radio. The specifications for this radio are provided in the table below.



3GPP Release

  • All 3GPP R8 2009 specifications
  • 3GPP R9 June and December 2010 specifications
  • 3GPP R10 December 2011 specifications
  • 3GPP Release 11, Release 12 UE Categories for 3CA

Control Plane

  • 3GPP TS 24.301 Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS)
  • 3GPP TS 36.331 Radio Resource Control (RRC) protocol specification
  • 3GPP TS 36.323 Packet Data Convergence Protocol (PDCP) specification
  • 3GPP TS 36.322 Radio Link Control (RLC) protocol specification
  • 3GPP TS 36.321 Medium Access Control (MAC) protocol specification
  • 3GPP TS 36.211 Physical Channels and Modulation
  • 3GPP TS 36.212 Multiplexing and channel coding
  • 3GPP TS 36.213 Physical layer procedures

User Plane

  • VoLTE Voice & Video (IR.92 & IR.94)
  • Video on Demand [VoD]
  • HTTP Streaming
  • Stateless UDP


General Specifications


  • 4 Primary carriers per XAir2
  • Up to 24 sectors in one XGS-12 chassis
  • 1200 simultaneous RRC-Connected UEs per Carrier, 4000 per blade
  • 400 simultaneous Volte calls per Carrier, 1200 per blade
  • Custom channel modeling and pre-defined DL channel models based on 3GPP TS 36.101 (AWGN, EPA5Hz, EVA5Hz, EVA70Hz, ETU70Hz, ETU300Hz, HST)


Physical Specifications


  • Number of CPRI ports: 4
  • Number of 10G Ethernet ports: 1 connected by Optical Multimode 850nm transceiver with SFP+
  • The ports currently used are: CPRI 1, CPRI 2, CPRI 5, CPRI 6 and Port 4
  • Provides connection to an eNodeB through Ixia’s Remote RadioHead unit that covers all FDD and TDD frequency bands
  • Built-in high accuracy 10MHz clock for eNB synchronization
  • 1U high 19” rack mounted interface card
  • Dimensions: 17.3” (L) x 1.3” (W) x 12.0” (H) / 440mm (L) x 33mm (W) x 305mm (H)
  • Power consumption: 184 Watts
  • Gross Weight: Module only: 12.9 lbs (5.85 kg) / Shipping: 19.7 lbs (8.94 kg)

Wideband RadioHead 400MHz – 5.9GHz

  • Channel Bandwidth: 5/10/15/20 MHz
  • Tunable range 400MHz – 5925MHz
  • FDD or TDD operation
  • Receiver Function: 10dBm maximum receive signal input
  • Operating input voltage: 100 – 240 VAC, 50-60 Hz
  • Typical input power 95W; Maximum input power 130W
  • 19” Rack Mount; Height: 1U; Depth: <500mm

platform options

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Ixload platform options


  • XGS-12 HS/SD Chassis
  • XGS-2 HS/SD Chassis

Load Modules

  • XAir2
  • PerfectStorm


Key Features
  • Real-world subscriber modeling
  • Full-featured LTE UE emulation with FDD, TDD, DRX, etc.
  • Mobile application modeling with voice, video, and data traffic, including QoE (MOS, PESQ) and QoS measurements
  • Complex signaling operation, including Attach, Detach, Handover, TAU, and Idle Mode operation 
  • Channel modeling that allows UE cell center/edge simulation with LTE DL Fast Fading emulations including Pedestrian, Vehicle, Urban, and High-Speed Train
  • LTE Advanced Pro ready


Continuous increase in capacity demand drives mobile wireless operators to greatly expand their network capacities. Service providers are under pressure to offer more throughput per user, while guaranteeing end-to-end quality of service. Vendors are employing new technologies to deepen network capacities beyond just expanding radio coverage, bringing in new challenges for lab testing.


Ixia’s XAir2 load module provides LTE user equipment (UE) emulation that enables a powerful IxLoad eNodeB Layer 1 to 7 test solution. With complex UE modeling, it offers realistic and easily-configured traffic models and call patterns. Using IxLoad’s real-world subscriber modeling, testers do not need to be protocol experts to develop test realism. From a single tool, users can perform capacity tests, detail a cell throughput, measure voice and video quality, model a wide variety of mobility scenarios.


  • 4 Primary Carriers
  • FDD and TDD duplex, selectable on each carrier
  • LTE-Advanced Carrier Aggregation (2CA through 4CA)
  • 5, 10, 15, 20 MHz channel bandwidth support
  • 4 CPRI Ports supporting CPRI line rates 3, 5, and 7 (2457.6 to 9830.4 Mbit/s)
  • SISO, 2x2 and 4x4 MIMO antenna configurations
  • Transmission Modes ranging from TM1 to TM4
  • Up to 256QAM Downlink and 64QAM Uplink
  • Built-in high accuracy Stratum 1 10MHz clock 
  • Support for UE Categories 1-6 and 9-12
  • NAS/PDCP compression and ciphering
  • Full DL/UL HARQ capability
  • Semi-persistent scheduling
  • CBRS 3.5GHz bands support
  • Supports the Ixia Wideband Radio (bands in the range of 400 MHz to 6 GHz)
  • Mobility validation with Handover and Reestablishment scenarios
  • Standard and Custom Channel Modeling features
  • Thousands of simulated UEs
  • Automatic configuration of MIB/SIB parameters
  • EPC simulation available for testing eNodeB in isolation 
  • Application support for IxLoad Voice, Video, and Data protocols including VoLTE/ViLTE, HTTP, FTP
  • Automation via Tcl, Python, and Rest API scripting