Today, more than 50% of voice calls and 60% of the wireless traffic data originate in the indoor environment, and to improve the indoor radio coverage and transmission quality becomes a major issue. The deployment of the Small Cells (SCs) could easily and efficiently increase the indoor radio access quality and capacity. The SCs also provide the universal Local IP Access (uLIPA) feature allowing outside UEs connect to and access their home Local IP Access (LIPA) networks from the visited SCs. This paper proposed four schemes to support the uLIPA service. We compared their performance with the well-known prior solution, Virtual Private Network (VPN). Our study indicates that except the IPAM approach, the other uLIPA schemes bring significant overhead for those services with small-sized IP packets, e.g., the popular G.729 VoIP service. This study quantitatively shows that for both radio and wire transmission, the IPAM outperforms the other approaches.
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