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6.14.1.1 MS Radio Access Capability (A/Gb mode)
本帖最后由 爱卫生 于 2011-5-2 18:49 编辑
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。 |
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