Over-the-air isolation testing

• US 9,768,893 B1
• Filed: 11/16/2016
• Issued: 09/19/2017
• Est. Priority Date: 11/16/2016
• Status: Active Grant

• Current Assignee: Spirent Communications Incorporated
• Original Assignee: Spirent Communications Incorporated
• Inventors: Wank, Richard, Ludwig, Mike, Canady, Kevin, Shen, Michael
• Primary Examiner(s): Nguyen, Hai V
• Application Number:
  US15/353,697
• Time in Patent Office: 307 Days
• Field of Search: 455 6714, 3702411, 370338, 702117
• CPC Class Codes: H04B 17/0085 using test signal generators
• CPC Class Codes: H04B 17/16 Test equipment located at the transmitter
• CPC Class Codes: H04B 17/3912 Simulation models, e.g. distribution of spectral power density or received signal strength indicator [RSSI] for a given geographic region
• CPC Class Codes: H04W 24/06 Testing, supervising or monitoring using simulated traffic

Abstract

A unique method/device for isolating the over-the-air segment within a mobile communications network is provided. A coordinated set of tests is run to isolate problems in an end-to-end network including over-the-air segment, wired, and core network segments. Test results are compared to identify which segment or components within a segment is failing. The testing device executes the same test in two differentiated modes. In one mode, the device acts as a mobile client device identified by subscriber identification data that communicates with the network base station over-the-air using the standard control and data protocols of the mobile network. In another mode, the testing device, identified by the same subscriber identification data, acts like the combination of the same Mobile Client Device(s) and a Network Base Station using a wired interface that is equivalent to the wired interface that connects the network base station to the rest of the wired network.

Claims

1. A method for isolating a problem in a live cellular network that includes a network base station that connects an over-the-air network to a backhaul network that connects the network base station to a core network in a data center, the method comprising:

running an over-the-air version and a wired network version of a network test originating from a single mobile test device test using a unitary set of SIM card data in both the over-the-air and wired network session tests,

wherein the over-the-air version of the network test uses the test device connected over the air to the network base station, and the wired network version of the network test uses the test device with a wired connection to an IP network and emulates the network base station;

triggering the testing device to run a first test, launching as the first test the over-the-air version of the network test, and collecting first test results;

triggering the testing device to run a second test, launching as the second test the wired network version of the network test that comprises emulating the network base station, and collecting second test results;

comparing the first and second test results to determine whether the problem exists in the over-the-air network or exists within the wired network upstream of the base station.

2. The method of claim 1, further comprising:

connecting a second testing device between the backhaul network and the core network;

responsive to determining that the problem exists within the wired network upstream of the base station, triggering the second testing device to run a third test and collect third test results;

comparing the second test results to the third test results to determine whether the problem exists in long haul network or in the core network.

3. The method of claim 2, further comprising:

connecting a third testing device between components within the core network;

responsive to determining that the problem exists within the core network, triggering the third testing device to run a fourth test and collect fourth test results;

comparing the third test results to the fourth test results to determine whether the problem exists upstream or downstream of the third testing device.

4. A testing device for diagnosing an end-to-end performance problem in a live cellular network that includes a network base station that connects an over-the-air network to a backhaul network that connects the network base station to a core network in a data center, the testing device comprising:

a processor coupled to a memory;

a modem operable to send data into the over-the-air network,

an interface to the backhaul network, and

a subscriber identification module (SIM) storing identification data for a particular endpoint device;

the testing device connected by the interface to the backhaul network, the connection positioned near the network base station;

the memory storing a plurality of sets of instructions, wherein;

a first set of instructions which when executed by the processor causes the processor to emulate the network base station,

a second set of instructions which when executed by the processor causes the processor to launch a first test that sends data through the modem into the over the air network, and

a third set of instructions which when executed by the processor causes the processor to launch a second test that sends data that emulates the network base station to send data over the backhaul network;

wherein the data sent by the first test and the second test both include a unitary set of data stored in the SIM.

5. The testing device of claim 4, wherein the testing device is operable to:

receive a trigger to run the first test, launch the first test, and collect first test results;

receive a trigger to run the second test, launch the second test, and collect second test results; and

display test results determined by comparing first test results against second test results.

6. The testing device of claim 4, further comprising a user input device, the user input device operable to receive user input and trigger the first and second tests to launch.

7. The testing device of claim 4, further comprising a display device, the display device operable to display a diagnosis of the performance problem determined based on comparing first test results with second test results.

8. The testing device of claim 7, wherein the memory stores a fourth set of instructions which when executed by the processor causes the processor to compare the first test results with the second test results and determine a diagnosis.

9. The testing device of claim 4, wherein the testing device is communicatively coupled to a network test manager and operable to receive a trigger from a network test manager to launch the first or second test.

10. The testing device of claim 4, wherein the testing device is communicatively coupled to a network test manager and operable to:

send first and second test results to the network test manager; and

receive from the network test manager a diagnosis of the performance problem based on the first and second test results.

11. The testing device of claim 4, wherein the SIM is one of:

a physical card inserted into the testing device on which identification data is stored;

or

a virtual SIM card comprising software that receives identification information from a remote source and stores the information in the memory on the testing device.

12. The testing device of claim 4, wherein launching the first test and the second test cause the testing device to emulate one of an Android OS handset and an Apple iOS handset.

13. A system for isolating a problem in a live cellular network, the system comprising:

a plurality of testing devices as claimed in claim 4;

a network test manager comprising;

a processor coupled to a memory;

an interface to the backhaul network;

a user input device; and

a user output device;

the network test manager communicatively coupled to the one or more testing devices and operable to;

receive a command from a user through the user input device to run a test for diagnosing the problem;

send a message to a first testing device of the plurality of testing devices to trigger launching a first test;

send a message to a second testing device of the plurality of testing devices to trigger launching a second test, wherein the first testing device and the second testing device are connected to the network at different locations;

receive first test results from the first testing device and second test results from the second testing device;

determine a portion of the network experiencing a problem based on comparing the first test results with the second test results; and

display on the user output device an indication of the portion of the network experiencing a problem.

14. A testing device for verifying integrity of a small cell wireless network that includes a base station or access point for sending data to a core network, the testing device comprising:

a processor coupled to a memory;

a wireless modem;

a backhaul network interface;

a subscriber identification module (SIM) storing identification data for a particular endpoint device;

a handset emulator; and

a core network emulator;

wherein the testing device is operable to;

send first data from the handset emulator into the small cell wireless network through the wireless modem to the core network emulator, wherein the first data includes handset and subscriber identification data stored in the SIM;

wherein a base station or access point installed in the small cell wireless network relays the first data received over the wireless network to the core network emulator, and in response to receiving the first data, the core network emulator sends response data to the handset emulator through the small cell wireless network;

receive the response data; and

display an indication of network functioning based on the response data.

15. The testing device of claim 14, wherein the wireless modem is a cellular modem and the small cell wireless network includes a base station.

16. The testing device of claim 14, wherein the wireless modem is a Wi-Fi modem and the small cell wireless network includes a Wi-Fi access point.

17. The testing device of claim 14, further comprising a second wireless modem, wherein:

the small cell wireless network comprises both a cellular network and a Wi-Fi network and comprising a corresponding base station and access point respectively;

the wireless modem is a cellular modem and the second wireless modem is a Wi-Fi modem; and

the testing device is operable to send data to the core network emulator through one of the Wi-Fi modem and the cellular modem.

18. The testing device of claim 14, wherein:

the base station or the access point sends the first data to the core network emulator through the backhaul network.