A novel SIP based procedure for congestion aware handover in heterogeneous networks

Adaptive probe-based congestion-aware handover procedure using SIP protocol

“…Thus, the SNR level is not sufficient parameter for handover decision and should not be performed only when SNR level exceeds the threshold, but should be done based also on other parameters (e.g. congestion status) [26]. This is especially important when providing real time applications (IP telephony in our case), where ability to provide sufficient QoE for the user is the most important and where performing handover to congested network could lead to degraded service level.…”

“…MAC, TCP, routing, low bandwidth on the access link), but only on the fact that if there is a delay, which is not acceptable for IP telephony, we do not use the corresponding access network. As the proposed CAHP-A procedure is an extension to CAHP-C procedure we provide short description of CAHP-C emphasizing only the main characteristics, as partially depicted in Figure 1, while in depth description of CAHP-C can be found in [26].…”

“…That procedure was upgraded in [26], where we are presenting a novel procedure for handover decision based on congestion detection (CAHP-C). In this paper, we are extending the CAHP-C procedure described in [26] with an adaptive procedure for congestion aware handover.…”

“…The CAHP-C procedure is used only if SNR exceeds the predefined threshold [26]. When SNR is below threshold, the proposed procedure is not used.…”

“…Our solution is described in [26], where we defined basic congestion aware handover procedure (CAHP-C), which enables efficient handover performance, taking into account also the congestion status of the target network. It should be noted, that receiving signal power measurement remains the prerequisite for handover (i.e.…”