6.14 Classmark Handling

爱卫生

补充说明：
  什么叫Classmark？
  答：对于每个MS均有一些关于MS能力的信息,如MS的功率等级,支持的加密算法,是否支持MS起始的短消息等等,这些信息称为MS的CLASSMARK。
——————————————————————————————————————————————————————————
  To support efficient radio interface usage in GPRS, the MS Classmark is handled differently for SGSN-based services than for MSC-based services. In particular, the Classmark information is sent in MM and Iu mode RRC messages to the network and stored in the network as long as the MS is attached, avoiding redundant Classmark retransmissions over the radio interface. This is sometimes called the "idle-mode Classmark" principle.
  In order to allow introduction of new radio access technologies in the future, the MS Classmark is split into distinct and independent information sets, the radio access Classmark, and the core network capability. The radio access Classmark is split into two information elements, the MS radio access capability (A/Gb mode) and the UE capability (Iu mode). The core network capability is split into two distinct information elements, the MS network capability IE (which shall be common for A/Gb mode and Iu mode) and for E-UTRAN capable MSs, the UE Network Capability IE.
  为了更好的支持在GPRS中空中接口的有效利用,MS Classmark的处理针对基于SGSN的服务和基于MSC的服务有些许区别。特别是，Classmark的信息将包含在MM（移动性管理）和Iu模式RRC消息中发送给网络侧并且只要这个MS是附着的就将一直存在网络侧，以避免不必要的Classmark在空中接口的重传。这个原则有时叫做"idle-mode Classmark"。为了允许在未来引入一些新的无线接入技术，MS Classmark被分为截然不同并且相互独立的信息集合，包括无线接入Classmark和核心网能力集。无线接入Classmark又被分成两个信息集合，MS radio access capability(A/Gb模式)和UE capability(Iu模式)。核心网能力集也被分成两个截然不同的IE（信息元素），MS network capability IE（对于A/Gb模式和Iu模式来说是公共的）以及UE Network Capability IE用于支持E-UTRAN的用户。
6.14.1 Radio Access Classmark
  The MS shall send the MS radio access capability in the GPRS Attach Request message to the SGSN regardless, if the MS is about to attach to A/Gb mode or to Iu mode network, as defined in TS 24.008 [13]. Both the MS radio access capability and the MS network capability contain some information on the UE's support for other RATs. The SGSN uses the information from the MS network capability, and knowledge about the support of Inter-RAT Handover, to request the MS to send information on the MS's other radio capabilities in the Attach Complete/RA Update Complete.
  If the MS supports SRVCC to GERAN (TS 23.216 [101]), the MS sends the CS domain's Classmark 2 and Classmark 3 information elements to the SGSN in the Attach Request/Routeing Area Update Request messages in both Iu mode and A/Gb mode.
  If the MS supports SRVCC to UTRAN (TS 23.216 [101]), the MS sends the CS domain's Classmark 2 information element to the SGSN in the Attach Request/Routeing Area Update Request messages in both Iu mode and A/Gb mode.
    MS应在GPRS附着请求消息中包含MS radio access capability发送给SGSN，而不管这个MS是要附着到一个A/Gb模式亦或是Iu模式的网络，这在TS24.008定义。MS radio access capability以及MS network capability都包含了关于UE对其他无线接入技术支持能力的一些信息。SGSN使用从MS network capability得到的信息，了解到MS是否支持Inter-RAT的切换，来请求MS在附着完成/RAU完成消息中发送关于MS的其他无线接入技术能力的相关信息。
  如果MS支持SRVCC切换到GERAN（TS23.216)，MS在附着请求/RAU请求消息中发送CS域的Classmark 2和Classmark 3的信息元素给SGSN，而不论是A/Gb模式还是Iu模式。
  如果MS支持SRVCC到UTRAN的切换（TS23.216）,MS在附着请求/RAU请求消息中发送CS域的Classmark 2给SGSN，而不论是A/Gb模式还是Iu模式。

爱卫生

  The MS radio access capability information element contains the A/Gb mode radio capabilities of the MS (e.g. multislot capability, power class), and more generally all the information that should be known by the BSS in order to handle radio resources for that MS with GERAN. The Inter RAT handover information that can be sent in the Attach Complete/RA Update Complete contains the information that the BSS needs for inter-RAT handover to other RATs.
  "MS radio access capability"IE包含了A/Gb模式的MS的无线侧能力（例如多时隙能力、功率级别），一般所有的信息在BSS当中也需要知道，因为BSS需要负责处理MS在GERAN中的无线资源。Inter RAU handover的信息包含了BSS所需要的为了inter-RAT切换流程切换到其他RAT所需要的信息，这些信息将在附着完成/RAU完成消息中发送。
  The MS radio access capability is a container for a multiplicity of radio access technology-dependent information, i.e. within the MS radio access capability there are independent sub-fields for various technologies such as GSM 900 and GSM 1800. The coding shall allow a BSS to extract only the sub-fields relevant to it without interpreting the other sub fields. This ensures that the MS radio access capability does not need to be interpreted by the NSS, and the full MS radio access capability is always sent by the MS to the SGSN, and thereafter provided to the BSS irrespective of the actual BSS capabilities.
  The SGSN shall provide the MS radio access capability as an information element on the Gb interface. It is the responsibility of the SGSN to provide the BSS with the most recent MS radio access capability received from the MS. The MS radio access capability information element can be included in a downlink transfer request, or be sent in a specific message that updates the MS radio access capability information in the BSS. The BSS may at any time request the MS radio access capability for a given MS to be transmitted from the SGSN to the BSS.
  "MS radio access capability"是一个包含了和无线接入技术相关信息的多样性的容器，也就是在这个"MS radio access capability"里，信息和这些技术的子分类无关。例如GSM900和GSM1800.编码应允许BSS仅提取和这个子分类相关的信息，而不能尝试解释别的子分类信息。这就确保"MS radio access capability"不需要由NSS来解释，完整的"MS radio access capability"将总是由MS发送给SGSN，在那之后，提供给BSS，而不管实际的BSS的能力。
  SGSN可以有一个实现选项，将"MS radio access capability"做为一个IE来在Gb接口提供给BSS。这是SGSN的职责，来给BSS提供最近的从MS收到的"MS radio access capability"。"MS radio access capability" IE可以包含在一个下行的传递请求中，或通过一个特定的消息将"MS radio access capability"更新给BSS。BSS可以在任何时候请求SGSN将一个给定的MS的"MS radio access capability"传递给BSS。
  Together with the MS radio access capability, the SGSN shall provide the IMSI of the MS when this is known. For a BSS supporting DTM, the IMSI is stored at the BSS and used for radio resource co-ordination; e.g. for a DTM MS.
  A specific optimisation allows the BSS to receive a reduced MS radio access capability at initial access directly from the MS. This enables the BSS not to wait for the full MS radio access capability to be provided by the SGSN, and is therefore quicker for the initial MS-originated transmission. The reduced MS radio access capability can be carried in several RR messages depending on the access method, e.g. in the initial random access message, or in the first uplink radio block. Details are provided in TS 24.008 [13] and TS 44.060 [77].
  和"MS radio access capability"一起，SGSN如果知道的话，也应提供这个MS的IMSI给BSS。对于一个支持DTM的BSS，IMSI将被存储在BSS中并用于无线资源的协同分配。例如为了一个DTM的MS。
  一个指明的优化流程，允许BSS在初始的接入的时候直接从MS接收一个简化的"MS radio access capability"。这使得BSS不需要等待从SGSN接收完整的"MS radio access capability"，因此可以加快初始的MS发起的信息传递。简化的"MS radio access capability"根据接入的方法，可以在多个RR消息中携带。例如初始随机接入消息，或第一个上行的radio block。细节在TS24.008和TS44.060中描述。
  If stored, the SGSN shall provide the Inter RAT handover information and MS Classmark 2 and MS Classmark 3 as information elements on the Gb interface when a Packet Flow Context is established. MS Classmark 2 and 3 are included to support the case that a SRVCC handover is needed following PS domain handover from GERAN to UTRAN/E-UTRAN.
  When the MS performs a Routeing Area Update (e.g. at GERAN-UTRAN change with change of RA in idle mode, and, GERAN-UTRAN Handover) the MS radio access capability shall be sent to the SGSN in the Routeing Area Update Request message. The SGSN then provides the BSS with the MS radio access capability.
  At inter-RAT Handover, the source, target and all other RATs' MS/UE radio capability are exchanged within the container information elements. To support subsequent connections, an A/Gb mode SGSN supporting inter-RAT handover requests the MS to send the Inter RAT handover information in the RA Update Complete message.
  如果存储了，SGSN应在一个PFC（Packet Flow Context)建立了的时候，在Gb接口给BSS提供Inter RAT切换信息以及MS Classmark 2和MS Classmark 3信息（做为信息元素IE来提供）。MS Classmark 2和MS Classmark 3信息被包含的原因是，是为了支持一个从GERAN到UTRAN/E-UTRAN的切换后的一个SRVCC的切换。
  如果MS执行了RAU（例如在Idle模式下发生了GERAN-UTRAN的变化并且RA也发生了变化，以及GERAN到UTRAN的切换），"MS radio access capability"应在RAU请求消息中发送给SGSN。SGSN然后给BSS提供"MS radio access capability"。
  在Inter-RAU切换中，源和目的以及所有的其他的RAT的"MS/UE radio capalibity"将被包含的容器IE中进行交换。为了支持后续的连接，一个支持inter-RAT的切换的A/Gb模式的SGSN，将请求MS在RAU完成消息中发送Inter-RAT切换信息。
  To allow for the addition of future radio technologies, frequency bands, and other enhancements, the SGSN shall store the Inter RAT handover information even if it is larger than specified in TS 24.008 [13], up to a maximum size of 255 octets.
  To allow for the addition of future radio technologies, frequency bands, and other enhancements, the SGSN shall store the MS radio access capability even if it is larger than specified in TS 24.008 [13], up to a maximum size of 255 octets.
NOTE: The 255 octet value comes from the information element encoding rules described in TS 24.007 [12].
  为了允许其他的未来的无线结束、频率波段以及其他的增强，SGSN应存储这个Inter-RAT切换信息，即使这个信息要比在TS24.008中描述的最大值255字节还要大。
  为了允许其他的未来的无线结束、频率波段以及其他的增强，SGSN应存储这个"MS radio access capability"，即使这个信息要比在TS24.008中描述的最大值255字节还要大。
  注释：从信息元素（IE)来的255个字节的这个值的编码规则在TS24.007中说明。

爱卫生

  The UE capability information element contains all the radio capabilities of the MS (power control, code resource, UE mode, ciphering, PDCP capabilities, etc.) that the RNC has to know in order to handle radio resources for this MS.
  The MS sends the UE capability information element to the serving RNC upon RRC connection establishment, and the RNC stores it. This is done before the Attach Request or Routeing Area Update Request message is sent.
  At SRNC relocation the source RNC sends the UE capability transparently through the core network to the target RNC. If the RNC has not received the UE capability information it can request the MS to send the information.
  At inter-system change the UE capability is transferred from the MS to the serving RNC on RRC connection establishment before the Routeing Area Update Request message is sent.
  Details are provided in TS 25.331 [52] and TS 25.413 [56b].
  "UE capability" IE包含了MS的所有空口方面的能力(功率控制、编码资源、UE模式、加密、PDCP能力等）。RNC必须要知道这些，以此来处理这个MS的无线资源。
  在建立RRC连接时，MS发送"UE capability"IE给服务RNC，RNC将其存储下来。这个步骤在附着请求或RAU请求消息发送之前完成。
  在SRNC重选的时候，源RNC通过核心网络透明地发送"UE capability"给目标RNC。如果RNC没有接收到"UE capability"信息，它可以要求MS发送这些信息。
  在inter-system change时，"UE capability"是在RAU请求消息发送之前，由MS在RRC连接连接建立时发送给服务的RNC。
  细节将在TS25.331和TS25.413提供。

爱卫生

  The MS network capability IE contains mostly non radio-related capabilities (e.g. the GSM GPRS ciphering, UMTS authentication, and TI extension capabilities) related to GERAN and UTRAN access. In the coding of the information element certain capabilities may be grouped together in a single indicator.
  The UE network capability IE mostly contains information related to the MS's E-UTRAN core network capabilities.
  "MS network capability"IE包含了大部分的和GERAN/UTRAN接入的空口无关的能力（例如GSM GPRS加密、UMTS鉴权以及TI扩展能力）。信息元素的某些能力的解码可以和一个单一的指示符一起组织在一起。
  "UE network capability"IE包含了大多数和MS的E-UTRAN核心网络能力相关的信息。
  The SGSN stores the MS network capability and UE network capability, which is used both by the local SGSN and for transfer to the new SGSN/MME for any type of inter SGSN/inter-RAT mobility. To avoid interoperability problems when roaming between A/Gb mode and Iu mode, the MS network capability shall be included in the routeing area update request sent by the MS. At inter-SGSN RA update, the network shall use this MS Network Capability and ignore the same IE received in MM Context from the old SGSN/old MME.
  SGSN存储"MS network capability"和"UE network capalibity"，这些信息将被本地SGSN使用，以及传递给新SGSN/MME做为任意类型的inter-SGSN/inter-RAT mobility流程时来使用。为了避免在A/Gb模式和Iu模式之间漫游造成的互操作问题，"MS network capability"应在RAU请求中包含，并由MS发送给网络侧。在Inter-SGSN RAU，网络侧应使用这个"MS network capability"，并且忽略掉从old SGSN/old MME收到的MM上下文中的相同的IE里包含的信息。
  If the MS's MS network capability and/or UE network capability information changes (including cases of being in E-UTRAN coverage and having ISR activated), the UE shall perform a Routeing Area Update ('type' different to 'periodic') when it next returns to GERAN/UTRAN coverage.
  To allow for the addition of future features, the SGSN shall store the UE Network Capability and the MS Network Capability even if either or both is larger than specified in TS 24.008 [13]/TS 24.301 [102], up to a maximum size of 32 octets for each IE.
  如果MS的"MS network capability"以及/或"UE network capalibity"信息发生了变化（包括在E-UTRAN的覆盖下并且ISR被激活的场景），UE应在返回到GERAN/UTRAN的覆盖后，执行一个RAU（类型不能为周期性的）流程。
  为了允许对额外的未来的特性的支持，SGSN应将"UE network capalibity"以及"MS network capability"存储下来，即使这两个值超过了在TS24.008中定义的每个IE32个字节的最大值。
  An E-UTRAN capable MS notifies the SGSN of its E-UTRAN capability using the MS Network Capability.
  NOTE: The MS Network Capability can contain information relating to the MS's non-E UTRAN EPS capabilities.

yuws

存下来慢慢看