5.5 Mobility Aspects for Home NodeB and Home eNodeB
22.2203GPPRelease 17Service requirements for Home Node B (HNB) and Home eNode B (HeNB)TS
5.5.1 PLMN selection
The standard automatic and manual network selection procedures are used to register a UE on a PLMN via a H(e)NB.
5.5.2 Idle-mode operation
In addition to normal cell reselection procedures, the following requirements apply:
– It shall be possible to support idle mode mobility between a H(e)NB cell and other cells and between H(e)NB cells.
– A UE in idle mode shall prefer to select a cell whose CSG Identity is in the UE’s Allowed CSG List or in the Operator CSG list, when the cell reselection criteria has been met.
NOTE: All CSG identities on the Allowed CSG list and the Operator CSG list have the same priority.
– The cell reselection procedure should not result in excessive power consumption in the UE.
5.5.3 Connected mode operation
– It shall be possible to support service continuity, including handover, between a H(e)NB cell and other cells and between H(e)NB cells. This includes H(e)NB cells in residential and enterprise environment.
– For operational and deployment purposes, handovers between a H(e)NB cell and other cells and between H(e)NB cells should not significantly increase mobility related signalling.
– Data session(s) may be terminated by the network after the UE leaves the H(e)NB coverage area on a per UE basis (e.g. based on subscriber tariff change).
5.5.4 Manual CSG selection
The user shall be able to request the UE to perform a scan for available CSGs. When such request is received the UE shall perform a scan of available CSGs, their CSG Identities and their HNB Names. In the UE display, the available CSGs shall be represented by their associated HNB Names and PLMN Name(s). If the HNB Name is not available, the CSG Identity shall be displayed instead.
An indication shall be given to the user as to which of the available CSGs is contained in the Allowed CSG List or Operator CSG list. The available CSGs shall be displayed in the following order:
– The CSGs, whose CSG Identities are contained in the Allowed CSG list.
– The CSGs, whose CSG Identities are contained in the Operator CSG List.
– Any other CSG, whose CSG Identity is not included in the Allowed CSG List or the Operator CSG list.
The HPLMN shall configure, on a PLMN basis, the UE to display the available CSGs so that either:
– all CSGs are displayed, or
– only CSGs in the Operator CSG List are displayed.
NOTE: It is assumed that OMA DM/OTA will be used by the HPLMN to configure the ME/USIM
By default, the UE shall display all available CSGs for any PLMN, unless the UE has been configured by the HPLMN, for a specific PLMN, to display only CSGs in the Operator CSG List that are available.
When the user selects an entry in the list, the UE shall reselect any of the available cells with the CSG chosen by the user.
The UE shall attempt to register to the PLMN.
If the registration attempt is accepted, the UE shall add the CSG identity to the Allowed CSG list unless the cell is a hybrid cell or the identity is already present in the list.
If the registration attempt is accepted and the UE is allowed to add the CSG identity to the Allowed CSG list then the UE may add the broadcasted HNB Name to the Allowed CSG list.
If the registration attempt is rejected and the CSG entry is in the Allowed CSG list, that CSG and the associated HNB Name shall be removed from the Allowed CSG list.
In addition, when the user manually selects a CSG in a PLMN, which is different from the last registered PLMN, the following behaviour applies:
– The UE shall enter into Manual PLMN Selection state.
– The UE shall attempt to register to the PLMN. This PLMN shall not be stored as the Last Registered PLMN.
– When the UE is no longer in the service area of the CSG the UE shall return to the previous PLMN Selection state.