Services aredistinguished into categories defined in [7]; also the categorisation of cellsaccording to services they can offer is provided in [7].
- Normal Service. A UE camped on a suitable cell can obtain normal service from the selected PLMN. Normal servicealways requires registration to the PLMN [20].
- 正常模式，终端驻留在一个小区，并获取正常服务，也就是最常见的注冊成功，进入待机模式。
- Limited Service. In case the UE could not find any suitable cell of the selected PLMN, it camps on an acceptable cell, where it could only obtain limited services (e.g. emergency calls) from the network. If registered to a PLMN, the UE shall continuously attempt to find a suitable cell of the selected PLMN, trying all frequency bands and RATs it iscapable of. While being in limited service state and camped on an acceptable cell, the UE follows normal cell re-selection procedures (e.g. countiniuously performs the “cell reselection evaluation process” as defined in [7]).
- 受限服务，假设终端在选择的PLMN中不能找到能够合适的小区（suitable cell），他能够驻留在一个可接受的小区（acceptable cell），可是仅能获取受限服务（比方紧急呼叫）。尽管寄居在acceptable cell，可是终端仍在该PLMN中不间断的寻找一个suitable cell，千辛万苦的，尝试他支持的全部频段、全部RAT。在受限服务状态，终端依照小区重选步骤进行
- Operator Service. In case the UE contains a SIM/USIM with an Access Class (AC) 11 and/or 15 and it is in its Home PLMN, the UE is allowed to select or re-select cells which are indicated as“reserved for operator use” in the system information. Such UEs shall treat those cells as normal cells during the cell selection and re-selection process,hence not exclude the cells from cell selection or re-selection. Operator Service is only applicable to UEs with AC 11 and/or 15 while in the Home PLMN. Other UEs shall treat such cells as barred.
- 运营商特殊服务。假设终端USIM的ACC等级在11和15之间，且在Home PLMN,将能选择或重选至运营商专有的小区。普通用户（ACC 0-9）不能享受此待遇，不能接入这些小区。