SIMULATING TIME-VARYING CONDITIONS IN A WIRELESS NETWORK
First Claim
8. A method for testing roaming of a wireless device between access points comprising the steps of:
- shielding the wireless device from electro-magnetic interference;
generating communications traffic with a communications traffic generating device in communication with the wireless device;
providing a plurality of communications paths between the wireless device and the communications traffic generating device, each path associated with an access point; and
individually, dynamically, adjustably attenuating signals between the wireless device and the traffic generating device via each communication path over time during a test with at least one attenuator,whereby roaming of the wireless device between access points can be tested by varying path loss between the wireless device and access points.
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Abstract
Time-varying conditions in a wireless network are simulated using an architecture that includes an enclosure for shielding a wireless device under test (“DUT”) from electro-magnetic interference, including other wireless devices; and at least one of: (1) a communications traffic generating device operable to generate communications traffic having selected characteristics; and (2) at least one dynamically adjustable attenuator in communication with the wireless device and the traffic generator. Embodiments of the architecture include wireless test equipment for testing operating range, roaming and capacity. The attenuator is used to adjustably attenuate signals between the device and the traffic generator over time during a test, whereby motion of the device is simulated. By connecting multiple access points, each associated with a dynamically adjustable attenuator, it is possible to force the DUT to roam between access points. The communications traffic generating device can be used to vary traffic over time during a test in order to test capacity, prioritization and admission control. For example, the communications traffic generator may include phone and data client emulators which simulate different traffic types that can be independently varied over time during a test.
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Citations
43 Claims
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8. A method for testing roaming of a wireless device between access points comprising the steps of:
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shielding the wireless device from electro-magnetic interference; generating communications traffic with a communications traffic generating device in communication with the wireless device; providing a plurality of communications paths between the wireless device and the communications traffic generating device, each path associated with an access point; and individually, dynamically, adjustably attenuating signals between the wireless device and the traffic generating device via each communication path over time during a test with at least one attenuator, whereby roaming of the wireless device between access points can be tested by varying path loss between the wireless device and access points. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. Apparatus for testing roaming of a wireless device associated with changing traffic conditions comprising:
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an enclosure for shielding the device from electro-magnetic interference; a communications traffic generating device in communication with the wireless device, the communications traffic generating device being operable to generate traffic in amounts which are variable over time during a test; and a plurality of access points, each in a communications path between the wireless device and the communications traffic generating device; whereby roaming of the wireless device between access points can be tested by varying traffic. - View Dependent Claims (1, 2, 3, 4, 5, 6, 7, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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27-1. The apparatus of claim 26 wherein the dynamically adjustable attenuator is further operable to adjustably increase and decrease signal strength over time, whereby changes in direction of motion of the DUT are simulated.
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29. A method for testing roaming of a wireless device associated with changing traffic conditions comprising the steps of:
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shielding the wireless device from electro-magnetic interference; generating, with a communications traffic generating device in communication with the wireless device, traffic in amounts which are variable over time during a test; and monitoring communications between the wireless device and a plurality of access points, each in a communications path between the wireless device and the communications traffic generating device; whereby roaming of the wireless device between access points can be tested by varying traffic. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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Specification