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Figure 57: RRC Modes, Main RRC States and Main Mode and State Transition
RRC Idle mode: In the Idle mode there is no connection established between the MS and the Iu mode RAN. There is no signalling between RAN and the MS except for system information that is sent from RAN on a broadcast channel to the MS. The MS can also receive paging messages with a CN identity on the PCH. There is no information of the MS stored in RAN in this mode.
RRC Idle模式;在Idle模式下,在MS和Iu模式RAN之间没有连接建立。在RAN通过广播信道发给MS的信息中只有系统信息而没有别的信令。MS也可以通过一个PCH接收一个带有寻呼消息的核心网ID。在这个模式,没有关于MS的信息存储在RAN节点。
RRC Connected mode: In the Connected mode the main states are Cell Connected state and URA Connected state. In this mode there is one RNC/BSC that is acting as serving RNC/BSC, and an RRC connection is established between the MS and this SRNC/SBSC.
- When the MS position is known at the cell level, the MS is in the Cell Connected state. When in Cell Connected state, the RRC connection mobility is handled by handover and cell update procedures.
- When the MS position is known at the URA level, the MS is in the URA Connected state. URA updating procedures provide the mobility functionality in this state. No dedicated radio resources are used in the URA Connected state.
RRC连接模式:在连接模式,主要的状态是小区连接状态和URA连接状态。在这个模式,有一个RNC/BSC被担当为服务RNC/BSC,并且在MS和这个SRNC/SBSC之间建立了一个RRC连接。
- 当MS的位置精确到小区级别,MS则处于小区连接状态。当在小区连接状态,RRC连接的移动性由切换和小区更新流程来处理。
- 当MS的位置精确到URA级别,MS则处于URA连接状态。URA更新流程提供了在这个状态的移动性功能。没有专门的空口资源需要在URA连接状态下使用。
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Figure 58- PS Paging by SGSN (Iu mode) Without RRC Connection for CS
NOTE 1: Steps 2 4 are common for architecture variants using Gn/Gp based interaction with GGSN. For an S4 based interaction with S GW and P GW, procedure steps (A) are defined in clause 8.2.4.1A.
1) The 3G SGSN receives a DL PDU or downlink signalling for an MS in PMM Idle state.
注释1:步骤2,4对于使用基于Gn/Gp接口和GGSN交互的架构是公共的。对于基于S4接口的和SGW/PGW的交互,流程步骤A在章节8.2.4.1A中定义。
1)3G SGSN收到了一个下行PDU或下行信令,要发给的对象是一个处于PMM-IDLE状态的MS。
2) The 3G SGSN sends a RANAP Paging (IMSI, P TMSI, Area, CN Domain Indicator, DRX parameters, list of CSG IDs for paging) message to each RNS belonging to the routeing area in which the MS is located. IMSI is needed by the RNS in order to calculate the MS paging group, and to identify the paged MS. If 3G SGSN assigned the P TMSI to the MS, P TMSI is also included. Area indicates the routeing area in which the MS is paged. CN Domain Indicator indicates which domain (MSC or 3G SGSN) initiated the paging message, and it represents "SGSN" in this case. DRX Parameters indicates the MS's preferred DRX cycle length. The list of CSG IDs for paging is included when the 3G SGSN is configured to support paging optimisation described in clause 5.3.9. For paging optimisation, the CSG IDs of expired CSG subscriptions and valid CSG subscriptions are both included in the list. If the MS has emergency bearer service the 3G SGSN shall not perform paging optimization.
2)3G SGSN发送一个 RANAP寻呼(IMSI、P-TMSI、区域、CN域指示符、DRX参数、用于寻呼的CSG ID列表)消息给MS所在位置RA的每个RNS。需要包含IMSI来计算MS寻呼组,并且来识别寻呼的MS。如果3G-SGSN给MS分配了P-TMSI,那应包含P-TMSI。区域指示了寻呼MS的路由区。CN域指示符指示是哪个域(MSC或3G SGSN)发起的寻呼消息,并且在这个例子里是“SGSN”。DRX参数指示了MS期望的DRX循环长度。当3G SGSN按章节5.3.9的要求配置了支持寻呼优化,则用于寻呼的CSG ID列表也要被包含。对于寻呼优化,超期的CSG签约的CSG ID以及有效的CSG签约的CSG ID都包含在列表中。如果MS有一个紧急承载业务,则3G SGSN不应执行寻呼优化。
NOTE 2: An expired CSG subscription indicates that the MS is not allowed service in the CSG. However, since the removal of the CSG from the MS is pending, it is possible the MS will camp on that CSG and therefore the MS is still paged for the CSG.
3) The RNS controls whether the MS has an established RRC connection or not. In this case, MS has no RRC connection, so a "normal PCH paging" is performed. Paging Type 1(IMSI or P TMSI, Paging originator, CN domain ID) is transferred on the Paging channel, IMSI or P TMSI identifies the MS. Paging originator indicates whether this is core network originated paging or RAN originated paging, so it represents "CN" in this case. And CN domain ID indicates whether this paging message is for CS service or PS service, so it represents "PS" in this case.
4) The paging request triggers the Service Request procedures in the MS. The service request procedures are described in clause "Service Request Procedure (Iu mode)".
Optionally, 3G SGSN may include "Non Searching Indication" in RANAP Paging message in this case. If a "Non Searching Indication" parameter is present, the RNC will not search the established RRC connection, and just initiate "normal PCH paging".
注释2:一个超期的CSG签约信息指示这个MS不允许在CSG中使用业务。然而,因为从MS移除CSG是挂起的,因此MS重新回到CSG来使用业务也是可能的,并且因此MS仍然为CSG寻呼。
3)RNS控制MS是否有已经建立的RRC连接。在这个例子中,MS没有RRC连接,因此将执行一个"normal PCH paging"。寻呼类型1(IMSI或P-TMSI)寻呼发起者,CN域ID)将通过寻呼信道传递,IMSI或P-TMSI识别出MS。寻呼发起者指明了是核心网发起还是RAN发起的寻呼。在这个例子里是核心网发起的。并且CN域ID指示了这个寻呼消息来自CS还是PS业务。在这个例子中是PS。
4)寻呼请求将触发MS发起Service Request流程。Service Request流程在章节"Service Request Procedure(Iu mode)"中描述。
8.2.4.1A Serving GW Triggered Paging (Iu mode) with S4
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Figure 58a- Serving GW triggered paging with S4
A) If the S GW has no downlink user plane TEIDs for S4 and S12, the S GW buffers the DL PDUs and identifies which SGSN is serving that UE.
If that SGSN has requested the S-GW to throttle downlink low priority traffic and if the downlink data packet is received on a low priority bearer to be throttled (see clause 5.3.6.5), the S GW drops the downlink data packet and may send an ICMP packet to signal to the source that there is no use in repeating the packet. The steps below are not executed.
Otherwise the S GW sends a Downlink Data Notification to the SGSN.
If the S GW has downlink user plane TEIDs for S4 the DL PDUs are transferred to SGSN.
A)如果SGW没有S4和S12接口的下行用户面TEID,SGW将缓存下行PDU并且识别出是哪个SGSN为这个UE服务。
如果SGSN请求SGW将那些信令数据中具有低优先级的流量扼杀掉,并且将通过一个低优先级的承载收到的数据流量扼杀掉(参考章节5.3.6.5),SGW将丢弃下行数据报文并且返回一个ICMP报文来告诉源端。下面的步骤将不被执行。
否则的话SGW发送一个下行数据通知给SGSN。
如果SGW有S4接口下行数据用户面的TEID,则下行PDU将传递给SGSN。
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Figure 59- PS Paging by SGSN (Iu mode) With RRC Connection for CS
NOTE 1: Steps 2 4 are common for architecture variants using Gn/Gp based interaction with GGSN and using S4 based interaction with S GW and P GW. For an S4 based interaction with S GW and P GW, procedure steps (A) are defined in clause 8.2.4.1A.
1) The 3G SGSN receives a DL PDU or downlink signalling for an MS in PMM Idle state.
2) The 3G SGSN sends a RANAP Paging (IMSI, P TMSI, Area, CN Domain Indicator, DRX parameters, list of CSG IDs for paging) message to each RNS belonging to the routeing area in which the MS is located. IMSI is needed by the RNS in order to calculate the MS paging group. If 3G SGSN assigned the P TMSI to the MS, P TMSI is included, and it identifies the MS is paged. Area indicates the routeing area in which the MS is paged. CN Domain Indicator indicates to which domain (MSC or 3G SGSN) the paging was initiated, and it represents "3G SGSN" in this case. DRX Parameters indicates whether or not the MS uses discontinuous reception and the DRX cycle length. The list of CSG IDs for paging is included when the 3G SGSN is configured to support paging optimisation described in clause 5.3.9. For paging optimisation, the CSG IDs of expired CSG subscriptions and valid CSG subscriptions are both included in the list. If the MS has emergency bearer service the 3G SGSN shall not perform paging optimization.
注释1:步骤2,4对于使用基于Gn/Gp接口和GGSN交互的架构是公共的。对于基于S4接口的和SGW/PGW的交互,流程步骤A在章节8.2.4.1A中定义。
1)3G SGSN收到了一个下行PDU或信令要发给一个PMM-IDLE状态的MS。
2)3G SGSN发送一个RANAP寻呼(IMSI、P-TMSI、区域、CN域指示符、DRX参数、用于寻呼的CSG ID列表)消息给MS所在位置RA的每个RNS。需要包含IMSI来计算MS寻呼组,并且来识别寻呼的MS。如果3G-SGSN给MS分配了P-TMSI,那应包含P-TMSI。区域指示了寻呼MS的路由区。CN域指示符指示是哪个域(MSC或3G SGSN)发起的寻呼消息,并且在这个例子里是“SGSN”。DRX参数指示了MS期望的DRX循环长度。当3G SGSN按章节5.3.9的要求配置了支持寻呼优化,则用于寻呼的CSG ID列表也要被包含。对于寻呼优化,超期的CSG签约的CSG ID以及有效的CSG签约的CSG ID都包含在列表中。如果MS有一个紧急承载业务,则3G SGSN不应执行寻呼优化。
NOTE 2: An expired CSG subscription indicates that the MS is not allowed service in the CSG. However, since the removal of the CSG from the MS is pending, it is possible the MS will camp on that CSG and therefore the MS is still paged for the CSG.
3) The RNS controls whether the MS has an established RRC connection or not. In this case, MS has an established RRC connection for CS service, so RNS sends an RRC Paging Type 2 (CN domain ID) message to the MS on established RRC connection. CN Domain ID indicates to which domain (CS or PS) the paging shall be directed, so it represents "PS" in this case.
4) The paging request triggers the Service Request procedures in the MS. The service request procedures are described in clause "Service Request Procedure (Iu mode)".
注释2:一个超期的CSG签约信息指示这个MS不允许在CSG中使用业务。然而,因为从MS移除CSG是挂起的,因此MS重新回到CSG来使用业务也是可能的,并且因此MS仍然为CSG寻呼。
3)RNS控制MS是否有已经建立的RRC连接。在这个例子中,MS有一个已经建立的RRC连接用于CS业务,因此RNS发送一个RRC寻呼类型2(CN域ID)消息通过已经建立的RRC连接发给MS。CN域ID指示了这个寻呼消息来自CS还是PS业务。在这个例子中是PS。
4)寻呼请求将触发MS发起Service Request流程。Service Request流程在章节"Service Request Procedure(Iu mode)"中描述。
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Figure 60- URA_GRA Paging Procedure
1) The RAN receives a downlink PDP PDU for an MS in RRC URA/GRA connected state. Downlink signalling to an MS in RRC URA/GRA connected state initiates URA/GRA paging as well.
2) The RAN pages the MS with one Paging Type 1 (RNTI, Paging originator) message in each cell belonging to the URA/GRA where the MS exists. RNTI is the identifier by which the MS is paged. Paging originator indicates whether this is the core network originated paging or RAN originated paging, so it represents "RAN" in this case.
3) The paging request triggers the Cell Update procedures in the MS. The Cell Update procedures are described in TS 25.331 [52].
1)RAN侧接收到一个下行方向的PDP PDU要发送给一个RRC URA/GRA连接状态的MS,或者是发给RRC URA/GRA连接模式状态的MS的下行信令消息都会发起一个URA/GRA的寻呼。
2)RAN发送一个Paging类型1(RNTI、寻呼发起者)的寻呼消息,这个消息在MS所在的URA/GRA并且是属于这个URA/GRA每个小区中发送。RNTI是用于寻呼时对MS的标识。寻呼发起者指示了是由核心网发起的还是RAN侧发起的寻呼,在本例中为“RAN”。
3)寻呼请求触发MS执行一个小区更新流程。小区更新流程在TS25.331中描述。
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