 Low-Speed Serial Links. RFC 1144, Internet Engineering Task Force, February 1990. 20. Degermark, M., Nordgren, B., and Pink, S. IP Header Compression. RFC 2507, Internet Engineering Task Force, February 1999. 21. Bormann, C., Burmeister, C., Degermark, M., Fukushima, H., Hannu, H., Jonsson, L-E., Hakenberg, R., Koren, T., Le, K., Liu, Z., Martensson, A., Miyazaki, A., Svanbro, K., Wiebke, T., Yoshimura, T., and Zheng, H. RObust Header Compression (ROHC): Framework and four profiles: RTP, UDP, ESP, and uncompressed. RFC 3095, Internet Engineering Task Force, July 2001. 22. 3GPP. General Packet Radio Service (GPRS); Mobile Station (MS) - Base Station System (BSS) interface; Radio Link Control/Medium Access Control (RLC/MAC) protocol. TS 44.060, 3rd Generation Partnership Project (3GPP), March 2012. 23. 3GPP. Mobile Station - Serving GPRS Support Node (MS-SGSN); Logical Link Control (LLC) Layer Specification. TS 44.064, 3rd Generation Partnership Project (3GPP), December 2011. 24. 3GPP. General Packet Radio Service (GPRS); Base Station System (BSS) - Serving GPRS Support Node (SGSN); BSS GPRS protocol (BSSGP). TS 48.018, 3rd Generation Partnership Project (3GPP), March 2012. 25. 3GPP. General Packet Radio Service (GPRS); Base Station System (BSS) - Serving GPRS Support Node (SGSN) interface; Network service. TS 48.016, 3rd Generation Partnership Project (3GPP), December 2009. 26. 3GPP. General Packet Radio Service (GPRS); Service description; Stage 2. TS 23.060, 3rd Generation Partnership Project (3GPP), March 2012. 27. ITU-T. SPECIFICATIONS OF SIGNALLING SYSTEM No. 7. Recommendation Q.700, International Telecom Union - Telecommunication Standardization Sector (ITU-T), March 1993. Basics of the 3GPP Technologies 28. ITU-T. Series I: Integrated Services Digital Network General structure - General description of asyn- chronous transfer mode. Recommendation I.150, International Telecom Union - Telecommunication Stan- dardization Sector (ITU-T), February 1999. 29. 3GPP. General Packet Radio Service (GPRS) enhancements 