From Long Term Evolution: 3GPP LTE Radio and Cellular Technology

Wolfgang Zirwas, Wolfgang Mennerich, Martin Schubert, Lars Thiele, Volker Jungnickel, and Egon Schulz


The 3rd Generation Partnership Project (3GPP) long tem evolution (LTE) release 8 specification defines the basic functionality of a new high-performance air interface providing high user data rates in combination with low latency based on MIMO (multiple input, multiple output), OFDMA (orthogonal frequency division multiple access), and an optimized system architecture evolution (SAE) as main enablers. At the same time, in the near future, increasing numbers of users will request mobile broadband data access everywhere for example, for synchronization of e-mails, Internet access, specific applications, and file downloads to mobile devices like personal digital assistants (PDAs) or notebooks. In the future, a 100-fold increase in mobile data traffic is expected [1], making further improvements beyond LTE release 8 necessary and possibly ending up in new LTE releases or in a so-called international mobile telecommunications (IMT) advanced system [2 4]. IMT-advanced is a concept from the ITU (International Telecommunication Union) for mobile communication systems with capabilities that go further than that of IMT-2000. IMT-advanced was previously known as systems beyond IMT-2000.

The main enemy in today's cellular radio systems is interference. Although intra-cell interference is of minor importance for OFDMA systems like LTE, intersector as well as intersite interference reduces achievable spectral efficiency by factors. Multiuser MIMO (MU-MIMO) and OFDMA partly help to combat interference by beam forming gains and due to selection of resources less affected by interference. In the interference-limited case meaning small cell sizes like pico or...

Products & Services
Analog Modem-to-Cellular Converters
Analog modem-to-cellular converters allow legacy equipment with built-in analog modems to connect to the cellular data networks by emulating the traditional dial-up PSTN network.
3G, UMTS, and EDGE Chips
Third generation (3G) cellular communication chips include UMTS and EDGE chips. Universal mobile telecommunication system (UMTS) chips provide high-speed data access. Enhanced data rates for GSM evolution (EDGE) chips make GSM implementation easier.
Tablet Computers
Tablet computers are notebook computers with a liquid crystal display (LCD) on which the user can write using a special-purpose pen, or stylus.
Telephones and Cellular Phones
Telephones and cellular phones convert voice or other sound signals into a form that can be transmitted to another device that receives and reconverts the waves back into sound.
Wireless Communications Services
Wireless communications services provide cellular phone service, SMS, WAP and GPRS services to mobile phones.

Topics of Interest

Rainer Schoenen 8.1 Introduction In technologies developed a few years ago, the use of relays has hardly been studied, not to mention any standardization taking place. Long term evolution (LTE)...

Borko Furht and Syed Ahson Mobile users are demanding higher data rate and higher quality mobile communication services. The 3rd Generation Mobile Communication System (3G) is an outstanding success.

Acronyms 3GPP 3rd Generation Partnership Project AC admission control ACK acknowledgment AMBR aggregated maximum bit rate AP access point App. application ARP allocation retention...

OVERVIEW ITU has called the future cellular networks 3G networks or IMT-2000; the previous term was Future Public Land Mobile Telephone System (FPLMTS). The performance for IMT-2000 air interference...

The fi rst offi cial shift in communication systems from fi xed-location devices to portable/ mobile devices happened in 1973 when Martin Cooper, general manager of Motorola's Communications Systems...