Vertical roaming in wireless networks through improved quality of service measures
First Claim
1. A computer-implemented method, comprising:
- sampling a network allocation vector of a wireless network for a period of time;
calculating a network allocation vector occupation comprising calculating the ratio of the amount of time that the network allocation vector is busy during the time period to the total amount of time during the time period; and
calculating a wireless network quality of service measure as a function of the network allocation vector occupation.
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Abstract
A system and method for improved vertical handoff between different types of wireless network. Network allocation vector occupation and packet collision probability are used as quality of service measures, enabling vertical handoffs to be delayed until actually beneficial to quality of service. Improved wireless network cell boundary detection in vertical handoff scenarios is achieved with a Fourier-based technique in conjunction with an adaptively determined minimum operating signal strength threshold. Improved wireless network cell boundary detection enables vertical handoffs from high quality of service networks to be delayed as long as possible. Together, practical wireless network quality of service measures and improved detection of wireless network cell boundaries in vertical handoff scenarios reduce the rate of unnecessary vertical handoff resulting in higher overall quality of service experienced by a mobile computing device roaming between wireless network types.
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Citations
27 Claims
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1. A computer-implemented method, comprising:
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sampling a network allocation vector of a wireless network for a period of time;
calculating a network allocation vector occupation comprising calculating the ratio of the amount of time that the network allocation vector is busy during the time period to the total amount of time during the time period; and
calculating a wireless network quality of service measure as a function of the network allocation vector occupation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A computer-implemented method, comprising:
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transmitting probing data packets from a mobile computing device in a wireless network;
calculating a probing data packet collision probability for the wireless network based upon the probing data packets; and
calculating a wireless network quality of service measure as a function of the probing data packet collision probability. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification