Pros and Cons of VAP-Based Interconnection

This type of interconnection does not have significant advantages over the
other four types of interconnections. It is not clear how the VAP will operate with the regular 802.11 WLAN access points. From Figure 2.19, it is clear
that over the UMTS air interface, each packet will have twice UDP/TCP and
twice IP/PPP headers. In addition, there will be an IEEE 802.11 MAC
header along with the UMTS-related headers. The overhead of packets on
the low bandwidth air interface is quite large, which makes this interconnection
inefficient.