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，也就是最常见的注册成功，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，如果终端在选择的PLMN中不能找到可以合适的小区（suitable cell），他可以驻留在一个可接受的小区（acceptable cell），但是仅能获取受限服务（比如紧急呼叫）。虽然寄居在acceptable cell，但是终端仍在该PLMN中不间断的寻找一个suitable cell，千辛万苦的，尝试他支持的所有频段、所有RAT。在受限服务状态，终端按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。如果终端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。
[7]. 3GPP TS 25.304:"UE procedures in Idle Mode and Procedures for Cell Reselection inConnected Mode".
待机状态下，服务类型 WCDMA Service type in Idle mode