Mobility Management as name implies it is related to management of user mobility or roaming. User is free to walk in all geographical location. Hence it is responsibility of network to manage user mobility to provide seamless calling(manage handover). Once user gets attach to the network(UE Attach Procedure), network should capable to support all kind of roaming and user mobility like user moving away from network or moving towards other service provider network or in the worst crossing some enemy line.
LTE support for user mobility
LTE supports different types of Handover to provide user uninterrupted service. Some of Handover Techniques discussed below
Inter RAT(Radio Access technology) handover, in this user moves into other Technology's network(LTE to 3G/2G).
Intra RAT handover, in this user move into same RAT but in different geographical location.
Inter PLMN handover, User moves to different service provider area, as a result PLMN also gets changed . Now user is having different sets of MCC(Mobile Country Code) and MNC(Mobile Network Code).
National and International Roaming, In National Roaming user moves to different service provider(operator) PLMN or same operator PLMN but in National Roaming defined area. When user moves into same service provider area but in National roaming areas means now user moved from H-PLMN(Home-PLMN) to V-PLMN(Visited PLMN). In Nation Roaming user can use either of PLMN(HPLMN and VPLMN), this is the point where User moved into roaming area(V-PLMN) but LTE/PGW still in H-PLMN.
International Roaming, where user switches to different PLMN from its HPLMN but out side the country region.
LTE support for user mobility
- TAU(Tracking Area Update) - In This procedure user has to update its location which is mappeded with one ID call TAI(Tracking Area Identity). Network maintains list of all TAI in TAL(Tracking Area List) and use this list when user in Idle mode and some downling packets or downling call arrives for user.
- User roaming
LTE supports different types of Handover to provide user uninterrupted service. Some of Handover Techniques discussed below
Inter RAT(Radio Access technology) handover, in this user moves into other Technology's network(LTE to 3G/2G).
Intra RAT handover, in this user move into same RAT but in different geographical location.
Inter PLMN handover, User moves to different service provider area, as a result PLMN also gets changed . Now user is having different sets of MCC(Mobile Country Code) and MNC(Mobile Network Code).
National and International Roaming, In National Roaming user moves to different service provider(operator) PLMN or same operator PLMN but in National Roaming defined area. When user moves into same service provider area but in National roaming areas means now user moved from H-PLMN(Home-PLMN) to V-PLMN(Visited PLMN). In Nation Roaming user can use either of PLMN(HPLMN and VPLMN), this is the point where User moved into roaming area(V-PLMN) but LTE/PGW still in H-PLMN.
International Roaming, where user switches to different PLMN from its HPLMN but out side the country region.
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