Mobility Management Entity
The Mobility Management Entity (MME) is a network component of the LTE mobile radio standard. It fulfills the functions of paging (for example to set up calls) and signaling for control purposes (for moving receivers). It forms the link between the core network and the access network .
function
The signaling included in the LTE architecture, the mobility management and treatment of the idle mode , so if the terminal is indeed achievable, but has no active communication link. The MME thus manages the control messages in connection with the registration, authentication, localization and roaming in the network.
Localization
The MME manages the whereabouts of all end devices in the radio cells connected to it . In the LTE system, several cells are usually combined to form a tracking area . The administrative area of an MME can be divided into several tracking areas .
For the purpose of energy efficiency, the end devices are not permanently localized. If a device is in idle mode , it only informs the MME of its location when changing from one tracking area to another (i.e. if it loses network access). In this case, it sends a so-called tracking area update .
Localization is also necessary as soon as another subscriber wants to establish an external connection with a device, for example during a call ( paging ). In this case, based on the information from the last tracking area update, the MME sends an identification number to all tracking areas ( broadcast ). Each tracking area now checks the identification number and, if there is a positive match, forwards the connection to all devices. If the identification number matches the device, the call is forwarded to the corresponding, now localized, radio cell.
Integration into the LTE architecture
In order to be able to achieve short transmission times, the LTE system was equipped with a flat hierarchy with a few system components. The functions have been divided up so that the core network is operated independently of the access network. The architecture differs fundamentally from GSM and GPRS and is called Evolved Packet Core (EPC) . The MMEs communicate both between the base stations of the access network, the eNode B , and with other components of the core network, namely the serving gateways , the packet data network (PDN) gateways and the home subscriber servers (HSS) . The data traffic to the Mobility Management Entity only consumes a fraction of the transmission capacity in relation to the connections between eNode Bs and serving gateways .
Individual evidence
- ↑ Hofstetter R., Tanner R., ( Memento of the original dated August 30, 2011 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. The core network of LTE - Part 3 of the series of articles on the new cellular standard (2008), p. 22 (PDF, 143Kb)
- ↑ Mobility Management Entity in LTE / EPC Networks ( Memento of the original from May 11, 2011 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. (2011), p. 2 (English, PDF, 805Kb)
- ↑ Hofstetter R., Tanner R., ( Memento of the original dated August 30, 2011 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. The core network of LTE - Part 3 of the series of articles on the new cellular standard (2008), p. 23 (PDF, 143Kb)
- ↑ 3G forum from UMTSlink.at ( Memento of the original from January 7, 2012 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. , LTE System Architecture - LTE Tutorial Part 2 (2010), accessed on October 23, 2011
- ↑ Hofstetter R., Tanner R., ( Memento of the original dated August 30, 2011 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. The core network of LTE - Part 3 of the series of articles on the new cellular standard (2008), p. 22ff. (PDF, 143Kb)
