利用CCCH的分组寻呼程序（3GPP 0408（3.5.1）英文协议翻译）

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1  CCCH上的临时块流的建立 当小区中不提供PCCCH时，CCCH上的程序支持在分组数据物理信道上的一个临时块流（TBF）的建立。用CCCH临时块流的建立程序仅仅适用于支持GPRS的MS。对于网络来说，该程序是可选的。
这些程序是对PCCCH临时块流的建立程序（见SM 04.60）的补充，包括利用CCCH的分组寻呼程序（3.5.1），分组接入程序（3.5.2），分组下行链路指配程序（3.5.3）
1.1    利用CCCH的分组寻呼程序
为了让MS中的上层发起响应，网络能够发起分组寻呼程序。分组寻呼程序只能由网络发起。
1.1.1 网络发起的分组寻呼
分组寻呼程序由网络侧的RR实体发起。该程序由一个MM子层的寻呼请求触发。“见GSM 04.07”
网络通过在CCCH或PCCCH上的一个适当的寻呼子信道上发送一个寻呼请求消息，来发起寻呼程序。当给MS发送寻呼信息且小区中不存在PCCCH时，利用CCCH上的寻呼子信道发起寻呼。
适用的寻呼请求消息有三种：
1）寻呼请求类型12）寻呼请求类型23）寻呼请求类型3 在用于分组寻呼程序 “寻呼请求”消息中，MS由P-TMSI(GPRS TMSI)或IMSI来识别。如果MS由P-TMSI识别，那么MS将执行3.5.1.2节中的程序。
如果MS由IMSI识别，那么MS应该解析用于相应的分组寻呼指示域的消息：
如果分组寻呼指示域表明的是RR连接建立的寻呼程序，或者消息中不存在该域，那么MS应该执行3.3.2.2中的程序；
如果分组寻呼指示域表明的是分组寻呼程序，那么MS应该执行3.5.1.2中的程序。
 “寻呼请求”消息可以包括多于一个MS的识别。
要求在分组空闲模式下的MS接收和分析发送在CCCH的寻呼子信道上的寻呼消息和立即指配消息，该寻呼子信道相应与在分组空闲模式下决定的寻呼组，见GSM 05.02.消息包括一个寻呼模式信息单元。
注：可能的立即指配消息是：“立即指配”，“扩展立即指配”和“立即指配拒绝”消息。
对寻呼模式信息的处理包括MS选择一个新的PCH时的程序，和没有正确接收当寻呼子信道中的消息的程序（见3.3.2.1.1）。
1.1.2 接收到分组寻呼请求
一接收到寻呼请求消息，带有地址的MS的RR子层将指示MM子层接收一个寻呼请求，见GSM 04.07。

以下为对应的英文协议
RR procedures on CCCH related to temporary block flow establishment
The establishment of a temporary block flow (TBF) on a packet data physical channel is supported by procedures on CCCH when PCCCH is not provided in the cell. The procedures for temporary block flow establishment using CCCH are only applicable to a mobile station supporting GPRS. The procedures are optional for the network.
These procedures constitute a complement to the corresponding procedures for temporary block flow establishment using PCCCH, defined in GSM 04.60, and include the procedures using CCCH for packet paging (clause 3.5.1), packet access (clause 3.5.2) and packet downlink assignment (clause 3.5.3).
1.1    Packet paging procedure using CCCH
The network can initiate the packet paging procedure in order to cause upper layers in the mobile station to respond, see clause 4. The packet paging procedure can only be initiated by the network.
1.1.1 Packet paging initiation by the network
The packet paging procedure is initiated by the RR entity of the network side. It is triggered by a page request from the MM sublayer, see GSM 04.07.
The network initiates the paging procedure by sending a paging request message on an appropriate paging subchannel on CCCH or PCCCH. Paging initiation using a paging subchannel on CCCH is used when sending paging information to a mobile station and PCCCH is not present in the cell.
NOTE 1:    There are three types of paging request messages that are applicable:
-        PAGING REQUEST TYPE 1;
-        PAGING REQUEST TYPE 2; and
-        PAGING REQUEST TYPE 3.
In a PAGING REQUEST message used for the packet paging procedure, the mobile station shall be identified by the P-TMSI (GPRS TMSI) or its IMSI. If the mobile station is identified by the P-TMSI, it shall proceed as specified in clause 3.5.1.2.
If the mobile station identified by its IMSI, it shall parse the message for a corresponding Packet Page Indication field:
-        if the Packet Page Indication field indicates a paging procedure for RR connection establishment, or the field is not present in the message, the mobile station shall proceed as specified in clause 3.3.2.2;
-        if the Packet Page Indication field indicates a packet paging procedure, the mobile station shall proceed as specified in clause 3.5.1.2.
A PAGING REQUEST message may include more than one mobile station identification.
The mobile station in packet idle mode is required to receive and analyse the paging messages and immediate assignment messages sent on the paging subchannels on CCCH corresponding to the paging groups determined for it in packet idle mode, as specified in GSM 05.02. These messages contain a page mode information element.
NOTE 2:    The possible immediate assignment messages are: the IMMEDIATE ASSIGNMENT, the IMMEDIATE ASSIGNMENT EXTENDED and the IMMEDIATE ASSIGNMENT REJECT messages.
The treatment of page mode information, including the procedure when the mobile station selects a new PCH, and the procedure if a message in a paging subchannel is not received correctly are defined in clause 3.3.2.1.1.
1.1.2 On receipt of a packet paging request
On the receipt of a paging request message, the RR sublayer of addressed mobile station indicates the receipt of a paging request to the MM sublayer, see GSM 04.07.

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...上周考试的时候做错了