Method and apparatus for controllable simulation of mobility
First Claim
1. A test system for testing a wireless data communication device, comprising:
- a transmission datapath for transmitting wireless test data packets to said wireless data communication device;
a reception datapath for receiving wireless test data packets from said wireless data communication device; and
transmit error injection logic, within said transmission datapath, adapted to emulate the effects of spatial separation between said wireless data communication device and said test system by introducing controlled levels of impairment;
wherein said impairment includes modifying a Frame Check Sequence in said transmitted wireless test data packets to increase a frame error ratio observed at said wireless data communication device.
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Accused Products
Abstract
Systems and methods enabling the efficient and repeatable simulation of mobility, during performance measurements of wireless data communications equipment are described. These are particularly useful for testing the impact on performance of spatial separation between Wireless Local Area Network (WLAN) devices, clients, relative to their counterparts, access points. In accordance with one or more embodiments of the present invention, the controlled emulation of spatial distance effects by injecting impairments into the transmitted and received wireless data packet streams are disclosed to simulate the impact of distance on properties of signal level, signal to noise ratio, and frame error ratio. Injection of impairments may be accomplished by varying the transmit power, artificially inducing errors into transmitted frames, and withholding acknowledgements for otherwise valid received frames, at levels consonant with the amount of distance to be emulated. This enables various mobility performance measurements to be made on WLAN devices without actually requiring that they be physically separated.
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Citations
34 Claims
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1. A test system for testing a wireless data communication device, comprising:
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a transmission datapath for transmitting wireless test data packets to said wireless data communication device; a reception datapath for receiving wireless test data packets from said wireless data communication device; and transmit error injection logic, within said transmission datapath, adapted to emulate the effects of spatial separation between said wireless data communication device and said test system by introducing controlled levels of impairment; wherein said impairment includes modifying a Frame Check Sequence in said transmitted wireless test data packets to increase a frame error ratio observed at said wireless data communication device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A test system for testing a wireless data communication device, comprising:
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a transmission datapath for transmitting wireless test data packets to said wireless data communication device; a reception datapath for receiving wireless test data packets from said wireless data communication device; and receive error injection logic, within said test system, adapted to emulate the effects of spatial separation between said wireless data communication device and said test system by introducing controlled levels of impairment; wherein said receive error injection logic modifies a frame error ratio reported to said wireless data communication device, independently of an actual frame error ratio detected by said reception datapath. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method for emulating the effects of spatial separation between a wireless data communication tester and a wireless data communication device, comprising:
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transmitting wireless test data packets from said wireless data communications tester to said wireless data communications device; receiving wireless test data packets by said wireless data communications tester from said wireless data communications device; and simulating controlled levels of receive impairment in said received wireless test data packets; wherein said receive impairment includes modifying a frame error ratio reported to said wireless data communication device, independently of an actual frame error ratio. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34)
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Specification