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来源：百度知道 编辑：UC知道 时间：2024/05/17 06:14:57
ATM/AAL2-Based UTRAN — In UMTS all user
traffic is subject to air interface shaping and
imperative functionality in the UTRAN imposed
by CDMA, calling for connection orientation
with strict quality of service (QoS) control. The
radio interface may vary in time, which results in
variable bit rate traffic independent of the properties
of user data. Therefore, the statistical multiplexing
of ATM is advantageous in the access
line from the base station toward the mobile network
infrastructure. Applying ATM to very-lowbit-
rate mobile voice streams in a mobile
communications network necessitates a so-called
layered cell structure, also known as ATM Adaptation
Layer 2 (AAL2), which multiplexes several
minicells into one ATM cell to prevent
degradation of the QoS due to the delay in filling
out the payload of a regular ATM cell. A
major impact in CDMA systems is related to
soft ha
traffic is subject to air interface shaping and
imperative functionality in the UTRAN imposed
by CDMA, calling for connection orientation
with strict quality of service (QoS) control. The
radio interface may vary in time, which results in
variable bit rate traffic independent of the properties
of user data. Therefore, the statistical multiplexing
of ATM is advantageous in the access
line from the base station toward the mobile network
infrastructure. Applying ATM to very-lowbit-
rate mobile voice streams in a mobile
communications network necessitates a so-called
layered cell structure, also known as ATM Adaptation
Layer 2 (AAL2), which multiplexes several
minicells into one ATM cell to prevent
degradation of the QoS due to the delay in filling
out the payload of a regular ATM cell. A
major impact in CDMA systems is related to
soft ha
atm/aal2-basedutran-在UMTS中,所有使用者的交通是受空中接口的整形和必要的功能,在utran 强加的CDMA系统,要求就导向与严格的服务质量(QoS)控制. 在无线接口可以在不同的时间, 结果在可变码率交通独立性质的用户数据. 因此, 在统计复用的ATM是有利的准入线从基站向移动网络的基础设施. 使用自动柜员机非常-lowbit率移动话音溪流的移动通信网,必须有一个所谓的层状结构的细胞, 又称为ATM适配层2(aal2) 其中几个频道minicells成一个ATM细胞,以防止退化的QoS延迟加油 进行有效载荷的一种经常性的ATM. 重大影响CDMA系统相关软切换接入网络, 当话筒传达一个以上的基站. 为了工作的无缝连接格局已经将演出100余或不足,在软切换. 由于严格radiolevel同步需求之间的软切换腿 这些aal2连接都必须符合严格的延迟和延迟抖动要求无论何种类型的用户载荷 (即不论语音或数据传送). 此外, aal2还允许的数目减少输电线路及相关费用必须支持多重连接处理 软切换W-CDMA的基于UMTS的[6,7]. 总之, atm/aal2-based的UMTS接入网络为核心networktechnology-独立通道,为移动终端所有核心网络和网络服务. 注意到农技与AAL2协议的终止在无线电基地站内utran, 而不是目前的移动终端. 如图. 2,utran重视为UMTS核心网络由iu接口. 至于用户面,iucs是基于atm/aal2,iups月atm/aal5. 农技协议的终止在边缘节点,即 在加强服务的GPRS支持节点(e-封包)与增强访问移动交换中心(电子vmsc).