| 摘要 |
Techniques are disclosed for evaluating an ongoing VoIP call over a combination of IP data communication network connections for purposes of determining when to hand it off to a circuit-switched cellular network connection. Multiple IP stream call quality values X1(i), X2(i), and Xb(i) are sampled over a time period (N) of (j) samples for an ongoing telephone call and stored. Instantaneous annoyance values a1(j), a2(j), and ab(j) for each of the stored call quality values for each of the IP streams within sampled time period (N) are calculated. Current accumulated annoyance values A1(i), A2(i), and Ab(i) are obtained by summing the instantaneous annoyance values a(j) for each IP network. The combined IP stream accumulated annoyance values Ab(i) is compared to a handoff threshold values Hb(i). A handoff of the telephone call a circuit-switched cellular communication link is initiated when the accumulated annoyance value Ab(i) is greater than the handoff threshold value Hb(i). |
| 主权项 |
1. At least one machine-readable non-transitory medium comprising a set of instructions that in response to being executed on a computing device cause the computing device to:
obtain IP stream call quality values X1(i) and X2(i) over a sampled time period (N) of (j) samples for an ongoing telephone call over (a) a first IP communication link carrying a first IP stream and (b) a second IP communication link carrying a second IP stream; determine call quality values Xb(i) for a combined version of the first and second IP streams; store the IP stream call quality values X1(i), X2(i), and Xb(i); calculate a first instantaneous annoyance value a1(j), a2(j), and ab(j) for each of the stored call quality values X1(j), X2(j), and Xb(j) within sampled time period (N); calculate a first current accumulated annoyance value for each IP stream A1(i), A2(i), and Ab(i) by summing the instantaneous annoyance values a1(j), a2(j), and ab(j); initiate a handoff of the telephone call from the IP communication links to a circuit-switched cellular communication link if the accumulated annoyance value for the combined version of the IP streams, Ab(i), is greater than a handoff threshold value for the combined version of the IP streams, Hb(i); otherwise determine whether A2(i) is greater than a handoff threshold value for the second IP stream, H2(i); determine whether the first IP stream over the first IP communication link is predicted to disconnect imminently; and if so initiate a handoff of the telephone call from the combined IP stream communication links to a circuit-switched cellular communication link when the second accumulated annoyance value A2(i) is greater than a second handoff threshold value H2(i). |
