HSPA (High Speed Packet Access) is like having the home cable broadband experience delivered to the mobile phone or notebook. HSPA is part of the GSM 3G network and is (predominately) a software upgrade of the network infrastructure. To use the high speed variant, it is necessary to have a mobile device that is HSPA-enabled – most new mobile phones and high-end notebooks only have these as standard. Belonging to the family of GSM, It is the latest technology to enable even faster data rates for mobile users. It has various enhancements on its route. Firstly, HSDPA ( High Speed Downlink Packet Access) has the capability to take delivery of bulky files to the mobile device such as email attachments, PowerPoint presentations or web pages. HSDPA 3.6mbps network can download a typical music file of around 3Mbytes in 8.3 seconds and a 5Mbps video clip in 13.9 seconds. Speeds achieved by HSDPA top 14.4Mb/s but most network operators provide speeds up to 3.6Mbps, with the rollout of 7.2Mbps quickly growing. HSUPA (High Speed Uplink Packet Access) is a further enhancement that helps in increasing the speed by which one can communicate from the mobile device, for example one can easily upload videos from UTube within a few seconds. Here the upload speed is increased to a maximum of 5.7Mb/s. HSPA Evolved which is also known as HSPA+ delivers data services, permit speed of up to 42Mb/s in the downlink and 11Mb/s in the uplink.
Global Systems for Mobile (GSM) communication is a cellular network operating between 850-900MHz, or 1800-1900MHz frequency bands. Code division multiple access (CDMA) is a form of multiplexing and a method of multiple access that divides up a radio channel not by time (as in time division multiple access), nor by frequency (as in frequency-division multiple access), but instead by using different pseudo-random code sequences for each user. Coming to their history, the GSM was originated in Europe in the year 1990 and gained world wide popularity because of its modern network features which are available to the individual mobile phone user. CDMA was developed by Qualcomm Inc. and it became an international standard in 1995. GSM is a widely spread standard and CDMA is a patented technology. That is you must pay a royalty for using CDMA! Also GSM covers the entire Europe, Asia except Korea, Africa and Middle East. So being a GSM user one can have virtually an international roaming. You can easily use a GSM phone in any of these countries while roaming. In South America CDMA is generally 1900MHz, elsewhere generally 800MHz. Brazil seems to have nothing but 1800MHz GSM. In GSM phones, you can change the SIM card whereas in CDMA phones the SIM card is sealed.
EDGE, or â€œEnhanced Data for GSM Evolutionâ€, is a technology which is faster and is a wireless service designed by Global System for Mobile (GSM) in order to deliver data at rates up to 384Kbps and make possible the delivery of multimedia along with other multimedia broadband applications to mobile phone and computer users. The EDGE standard is built on the existing GSM standard, using the same time-division multiple access (TDMA) frame structure and existing cell arrangements. The base stations can be updated with software. It was first marketed in 2001. EDGE is actively supported by GSM operators in North America. Some GSM operators elsewhere viewed UMTS as the ultimate upgrade path and either planned to skip EDGE altogether or use it outside the UMTS coverage area. However, the high cost and slow uptake of UMTS have resulted in fairly common support for EDGE in the global GSM/GPRS market. EDGE uses higher-order PSK/8 phase shift keying (8PSK) for the upper five of its nine modulation and coding schemes. EDGE produces a 3-bit word for every change in carrier phase. This triples the gross data rate offered by GSM which means operators can handle three times more subscribers than GPRS; triple their data rate per subscriber. There are various American companies that have EDGE networks in operation, for example AT&T Mobility, Centennial Wireless, Cincinnati Bell and many more. In simple words, it is just a software upgrade for many existing gprs/gsm users.