2.PDP激活时，有Access point name和PDP address，代表着用户要连接的目的地址。假设在BT下载的同时也浏览网页，这两个动作的目的地址应该是不一样的吧，只需要激活一个PDP怎么就可以实现了呢？
3.Secondary PDP Context到底用什么用呢？有什么实例吗？
The purpose of Secondary PDP Context procedure is to establish an additional PDP context between the MS and the network for a specific
Traffic Flow Template (TFT) and QoS profile on a specific NSAPI, when one or more PDP contexts has/have already
been established for the particular PDP address.
4.PDP激活中的，PFC procedure流程是指的什么意思呢？
时间: 2009-11-21 16:29
作者: guanhua001 标题: 1、2
1. 按照我的理解，是同一个RB来传输，当你进行高数据业务的时候，进行了ratechange，高速率包含了低速率的业务。
2. access point name是apn，这个是和拨号所用的接入点相关，不是Internet连接的目的地址。
3、4 没怎么接触过。
时间: 2009-11-22 17:21
作者: etcjimi
1. use same RB called multipleRAB
2. use 2 PDPs if for different QoS or connecting different APNs
3. second is for application using with different QoS than primary PDP (voice over IP Vs streaming video)
4. PFC (btween UE <-> SGSN) + IP tunnel(SGSN<->GGSN) = PDP context (UE <-> GGSN)
时间: 2009-11-25 08:46
作者: kkdr
etcjimi ，很专业，也很简洁明了。
想再麻烦你下。
1.对于PS域来说，一个RB对应一个RAB，你所说的multipleRAB应该如何理解呢？我在25331 上没有找到这个名词。
2.我用TD的终端做过测试，激活一个PDP后，可以在用迅雷下载的同时浏览网页，接入的APN是CMNET。这样的话，迅雷下载和浏览网页是用的同一个QOS吧。为什么下载的速率挺好，可是浏览网页特别慢呢，即便是把下载关了也慢。traffic class已经设成交互式的了。
3.“voice over IP Vs streaming video”这个具体指的是什么业务呀？是指的视频里的语音么，我用PPStream看视频时有声音也没有激活second 。
时间: 2009-11-25 11:53
作者: etcjimi
1.should be called "multiRAB". it's maped on same physical channel after "RAB reconfiguration".
2.QoS for different services is defined by operator,http is "interactive" and usually is set to lower priority (best effort). Not sure how your operator set QoS for 迅雷.Look like it eats most of bandwidth and left litte for http. You might check its signalling trace/log for a clue.
3.Voice over IP is "IP电话" such as voice all via Skype (it has its own SIP server similar to the one used in IMS system- which is mandate for LTE). Streaming video has its own voice and video, i.e. when you watch youbute video on the phone.
etcjimi classmate，谢谢你的讲解。
下载、watch video 、浏览网页需要不同的QoS 。用一个QoS 激活PDP，也就是连接上网后，RAB reconfiguration后可能会改变QoS ，use multiRAB可以同时进行这些需要不同QoS的业务，而不用激活second PDP。
a.我这样理解，对吗？这样的话，是不是网会频繁的RAB reconfiguration呢？
b.与first PDP相比，second PDP应该有不同的QoS、APN、address吧。用3G终端上网的话，要接入的APN、address应该是一样的，只是对应不同的业务需要不同的QoS。是不是也没有发起second PDP的必要性呢？
感觉“voice over IP Vs streaming video”这两个业务也没有发起second PDP的必要性吧？
时间: 2009-11-27 15:09
作者: etcjimi
a. not really. FTP and watch video, http might not be reconfigured on same mulitRABs. but I can't be 100% for sure on this.
b. UE can have multiple primary PDPs(connecting to different APN or PDN), each primary PDPs can have a number of second PDPs(reuse same APN&IP address but with different QoS.)second PDPs always assiciate to its primary PDPs.
The TFT (Traffic Flow Template) is introduced to address different PDP context and route downlink user plane data into the correct GTP tunnel and hence into the correct RAB for each context.