UMTS 3GPP TS 25.304：用户设备在空闲和连接模式下的程序

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"3GPP协议25.304是关于UMTS（Universal Mobile Telecommunications System）系统中用户设备（UE）在空闲模式下的操作规程和连接模式下的小区重选流程的技术规范。这份规范属于3GPP TS 25系列，版本为8.12.0，发布于2011年7月，由ETSI（European Telecommunications Standards Institute）发布。关键词包括UMTS，该文档可以在ETSI的官方网站上下载。" 3GPP协议25.304是3G移动通信系统中的一个关键规范，主要关注用户设备在不同模式下的行为。此协议详细定义了UE如何在空闲模式下进行操作，以及在连接模式下执行小区重选的过程。这些规程对于确保网络的高效运行和用户体验的质量至关重要。在空闲模式下，UE需要保持与网络的连接，同时尽可能地节省能源。25.304规定了UE如何监测服务小区的信号质量，如何执行小区选择和重选，以及如何在多个可用小区之间切换。这涉及到测量参数的设定、邻小区列表的管理、以及重选决策的触发条件等。在连接模式下，UE已与特定小区建立了一个激活的无线连接。当UE需要在连接状态下进行小区重选时，25.304描述了UE应如何评估当前小区的性能，并根据预设的重选准则判断是否切换到其他更好的小区。这一过程需要考虑的因素包括信号强度、服务质量、网络拥塞情况等。此外，这份技术规范还可能涵盖UE的功率控制、信道状态信息报告、系统信息接收、随机接入过程以及网络辅助信息的处理等方面。所有这些都旨在优化网络资源的使用，减少干扰，提高数据传输效率，并确保用户在移动过程中能保持稳定的通信质量。 3GPP协议25.304的版本更新，如8.12.0，反映了技术的演进和标准的改进。用户可以访问ETSI网站获取最新版本的文档，以确保遵循最新的操作规程。在解决任何争议时，应以ETSI秘书处特定网络驱动器上存储的PDF版本的打印输出作为参考。

ETSI

ETSI TS 125 304 V8.12.0 (2011

07)

3GPP TS 25.304 version 8.12.0 Release 8

Equivalent PLMN list: List of PLMNs considered as equivalent by the UE for cell selection, cell reselection , MBSFN

Cluster selection MBSFN Cluster reselection, handover and manual CSG selection according to the information

provided by the NAS.

HNB Name: The Home NodeB Name is a broadcast string in free text format that provides a human readable name for

the Home NodeB CSG identity and any broadcasted PLMN identity.

Home PLMN: A PLMN where the Mobile Country Code (MCC) and Mobile Network Code (MNC) of the PLMN

identity are the same as the MCC and MNC of the IMSI.

Location Registration (LR): UE registers its presence in a registration area, for instance regularly or when entering a

new registration area.

Maximum DRX cycle: Time interval for the longest possible DRX cycle in a cell.

MBMS Activated Service: An MBMS service that the UE has joined (multicast) or is interested in (broadcast).

MBMS Preferred Layer (PL): A frequency layer that is indicated by the UTRAN to be preferred for camping for

MBMS purposes.

MBSFN cluster: Set of cells operating in MBSFN mode providing only MBMS service in PtM mode and seen as one

cell by a UE.

MBSFN mode: In order to achieve higher spectral efficiency synchronized cells operate in MBSFN mode which

implies that they transmit exactly the same content over an area that is seen as one MBSFN cell by the UE.

Paging Block Periodicity (PBP): Period of the occurrence of Paging Blocks. (For FDD, PBP = 1).

Paging Message Receiving Occasion (TDD only): The frame where the UE receives actual paging message.

Paging occasion:

(FDD) The SFN of the PICH frame where the UE monitors its paging indicator (i.e. the SFN of the PCCPCH frame in

which the PICH frame begins).

(TDD) The paging block, which consists of several frames. The value of Paging Occasion is equal to the first frame of

the Paging Block.

Process: A local action in the UE invoked by a RRC procedure or an Idle Mode procedure.

Radio Access Mode: Radio access mode of the cell, FDD or TDD.

Radio Access Technology: Type of technology used for radio access, for instance UTRA or GSM.

Registered PLMN: This is the PLMN on which certain Location Registration outcomes have occurred [5].

Registration Area: (NAS) registration area is an area in which the UE may roam without a need to perform location

registration, which is a NAS procedure.

Reserved Cell: A cell on which camping is not allowed, except for particular UEs, if so indicated in the system

information.

Restricted Cell: A cell on which camping is allowed, but access attempts are disallowed for UEs whose access classes

are indicated as barred.

Selected PLMN: This is the PLMN that has been selected by the NAS, either manually or automatically.

Serving cell: The cell on which the UE is camped.

Strongest cell: The cell on a particular carrier that is considered strongest according to the layer 1 cell search procedure

[14][15]. As the details of the layer 1 cell search are implementation dependent, the precise definition of 'strongest cell'

is also implementation dependent.

Suitable Cell: This is a cell on which an UE may camp. For a UTRA cell, the criteria are defined in subclause 4.3, for a

GSM cell the criteria are defined in [1] and for a E-UTRA cell the criteria are defined in [18].

ETSI

ETSI TS 125 304 V8.12.0 (2011

07)

3GPP TS 25.304 version 8.12.0 Release 8

4 General description of Idle mode

4.1 Overview

When a UE is switched on, a public land mobile network (PLMN) is selected and the UE searches for a suitable cell of

this PLMN to camp on. Criteria for cell selection and cell re-selection between radio access technologies (RATs)

described in this document only consider radio criteria. In addition to RAT, the PLMN type may differ as well. In this

specification, the term PLMN is used as a generic term covering both GSM MAP and ANSI-41 type of PLMNs.

According to the type of PLMN, the way to identify it can be different. If the PLMN type is GSM, the PLMN is

identified by 'PLMN identity' and if the PLMN type is ANSI-41, the PLMN is identified by 'SID'

The NAS shall provide a list of equivalent PLMNs, if available, that the AS shall use for cell selection and cell

reselection.

The UE searches for a suitable cell of the selected PLMN and chooses that cell to provide available services, and tunes

to its control channel. This choosing is known as "camping on the cell". The UE will, if necessary, then register its

presence, by means of a NAS registration procedure, in the registration area of the chosen cell and as outcome of a

successful Location Registration the selected PLMN becomes the registered PLMN [5].

If the UE finds a more suitable cell, it reselects onto that cell and camps on it. If the new cell is in a different registration

area, location registration is performed.

If necessary, the UE shall search for higher priority PLMNs at regular time intervals as described in [9] and search for a

suitable cell if another PLMN has been selected by NAS.

NOTE: For RRC connected mode the requirements for the search for higher priority PLMNs are defined in [4].

Search of available CSGs may be triggered by NAS to support manual CSG selection within the registered PLMN.

If the UE loses coverage of the registered PLMN, either a new PLMN is selected automatically (automatic mode), or an

indication of which PLMNs are available is given to the user, so that a manual selection can be made (manual mode).

Registration is not performed by UEs only capable of services that need no registration.

The purpose of camping on a cell in idle mode is fourfold:

a) It enables the UE to receive system information from the PLMN.

b) When registered and if the UE wishes to establish an RRC connection, it can do this by initially accessing the

network on the control channel of the cell on which it is camped.

c) If the PLMN receives a call for the registered UE, it knows (in most cases) the registration area of the cell in

which the UE is camped. It can then send a "paging" message for the UE on control channels of all the cells in

the registration area. The UE will then receive the paging message because it is tuned to the control channel of a

cell in that registration area and the UE can respond on that control channel.

d) It enables the UE to receive cell broadcast services.

If the UE is unable to find a suitable cell to camp on, or the USIM is not inserted, or if the location registration failed

(except for LR rejected with cause #12, cause #14, cause #15 or cause #25, see [5] and [16]), it attempts to camp on a

cell irrespective of the PLMN identity, and enters a "limited service" state in which it can only attempt to make

emergency calls.

The idle mode tasks can be subdivided into four processes:

- PLMN selection;

- Cell selection and reselection;

- Location registration;

- Support for manual CSG selection.

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UMTS 3GPP TS 25.304：用户设备在空闲和连接模式下的程序

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