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89600 WLA Software

Technical Overviews

Key Features

Decode and verify PHY, MAC, RLC and RRC-layer messages across multiple radio frames

Extend your existing 89600 LTE FDD test setup with protocol analysis—with minimal additional investment in time or money

Troubleshoot LTE devices at the PHY and protocol layers simultaneously

Synchronize the 89600 VSA to the frame containing the currently selected message in WLA

Use charting capability to view power control, timing advance, HARQ and DCI information

Save and recall compressed data format message files for sharing between groups and fast certification after BTS software changes

Try before you buy!

Download the 89600 WLA software and use it free for 30 days to do analysis along with 89600 VSA and your analysis hardware, or explore the software in greater detail with our recorded demo signals by selecting File > Recall > Recall Demo > on the 89600 WLA software toolbar. Request your free trial license today: www.keysight.com/find/89600_WLA_trial

89600 WLA Software

For system-integration engineers and verification engineers, the troubleshooting of new BTS and UE designs will only get tougher as wireless standards evolve. Within standards such as LTE, the biggest challenges stem from the complex interactions between the physical (PHY) and higher layers during signaling operations.

Engineers who typically work at the PHY layer tend to rely on two tools of choice: RF signal analyzers such as the Keysight Technologies, Inc. X-Series and vector signal analysis software such as the Keysight 89600 VSA. As a complement to the 89600 VSA, Keysight has created the 89600 wireless link analysis (WLA) software to help PHY-focused engineers understand the protocol-layer control messaging that occurs between devices. In both system integration and verification the ultimate benefit is deeper insight into system operation and performance that accelerates day-to-day troubleshooting, ultimately improving time to market.

Technology overview

LTE

To ensure the competitiveness of 3G systems in the future, a long term evolution (LTE) of the 3rd Generation Partnership Project (3GPP) access technology was specified in Release 8 of the 3GPP standard. The LTE specification provides a framework for increasing capacity, improving spectrum efficiency, improving coverage, and reducing latency compared with current HSPA system implementations. In addition, transmission with multiple input and multiple output (MIMO) antennas is supported for greater throughput, as well as enhanced capacity or range. To support transmission in both the paired and unpaired spectrum, the LTE air interface supports both frequency division duplex (FDD) and time division duplex (TDD) modes.

System performance in LTE relies on the correct operation of many low level PHY/higher layer control loops and fast responses between the eNB and individual UEs. The flexibility available in LTE results in a complex test and verification environment, where incorrect configurations can go unnoticed

LTE-Advanced

For higher speed and larger data communications, 3GPP evolves their LTE technologies in Release 10 or later. New technologies of carrier aggregation, enhanced uplink PHY, and higher order MIMO in both DL and UL are deined with more design challenges.

Wireless link analysis

As implemented in the 89600 WLA software, wireless link analysis decodes higher layer control messages and correlates them with the PHY-layer signals they manage.

The decoding and correlation of messages provides greater visibility into higher-layer communication and leads to greater insight into unexpected behavior. The key benefit is the ability to view and interpret RF measurements—power, modulation format, timing, etc.—in a protocol-message context, and to view and interpret protocol messages in an RF context. For example, it’s one thing to know the UE is transmitting a PUSCH signal across 15 resource blocks (RB) at +25 dBm; it’s another thing altogether to match this against protocol-layer commands and then discover the device was told to transmit at only +23 dBm. This type of low-level control tends to be embedded deeply in the system and it operates with a high degree of autonomy. As a result, one of the only ways to observe and monitor link behavior is through combined PHY/protocol analysis.

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