4G equipments (Baseband 5216)

Long-Term Evolution (LTE) is a standard for high-speed wirelesscommunication for mobile phones and data terminals. It is based on the GSM/EDGE and UMTS/HSPA network technologies, increasing the capacity and speed using a different radio interface together with core network improvements.^[1][2] The standard is developed by the 3GPP(3rd Generation Partnership Project) and is specified in its Release 8 document series, with minor enhancements described in Release 9.

LTE is the upgrade path for carriers with both GSM/UMTS networks and CDMA2000 networks. The different LTE frequencies and bandsused in different countries will mean that only multi-band phones will be able to use LTE in all countries where it is supported.

The LTE standard supports only packet switching with its all-IP network. Voice calls in GSM, UMTS and CDMA2000 are circuit switched, so with the adoption of LTE, carriers will have to re-engineer their voice call network. Three different approaches sprang up:

Voice over LTE (VoLTE)

Main article: Voice over LTE

Circuit-switched fallback (CSFB)

In this approach, LTE just provides data services, and when a voice call is to be initiated or received, it will fall back to the circuit-switched domain. When using this solution, operators just need to upgrade the MSC instead of deploying the IMS, and therefore, can provide services quickly. However, the disadvantage is longer call setup delay.

The LTE standard covers a range of many different bands, each of which is designated by both a frequency and a band number. In North America, 700, 750, 800, 850, 1900, 1700/2100 (AWS), 2300 (WCS) 2500 and 2600 MHz (Rogers Communications, Bell Canada) are used (bands 2, 4, 5, 7, 12, 13, 17, 25, 26, 30, 41); 2500 MHz in South America; 700, 800, 900, 1800, 2600 MHz in Europe (bands 3, 7, 20); 800, 1800 and 2600 MHz in Asia (bands 1, 3, 5, 7, 8, 11, 13, 40) and 1800 MHz and 2300 MHz in Australia  and New Zealand (bands 3, 40). As a result, phones from one country may not work in other countries. Users will need a multi-band capable phone for 

roaming internationally.

 the following link for PDF illustrate more about Baseband 5216 used in 4G

http://adf.ly/13664457/ericsson-radio-system

http://adf.ly/13664457/baseband-5216

 

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