欢迎来逛逛,聊聊技术,侃侃大山.
本人主要喜欢WCDMA/TD-SCDMA无线侧的技术，如果有何关于无线技术方面的问题，你可以给我留言，我们可以一起讨论，共同提高。
same or different carriers for services
2006-10-23 10:48:44
(here, data means packet date or high speed data not CS data)
CDMA:
CDMA20001x: data and voice could be transmitted on same carrier
CDMA2000-EVDO: data and voice are transmitted on different carrier
CDMA2000-EVDV: data and voice could be transmitted on same carrier
WCDMA:
GPRS- data and voice could be transmitted on same carrier(due to TDMA's nature)
WCDMA-data and voice could be transmitted on same carrier
HSDPA-data and voice could be transmitted on same carrier
if different services can be multiplexed and transmitted on same carrier, which means UE can be provided with voice and date service in same time.
if different services can be multiplexed and transmitted on different carrier, which means UE can be not provided with voice and date service in same time. Thus, the hard handover will be for voice and data service.
For former one, UE can gotten simultaneous services and the spectrum efficiency will be higher(from the certain aspects), for example, packet data transmission can utilize the silent period of voice call. But it will bring us more tough task, such as, how to balance these services, or how to multiplex. This is a case in WCDMA.
For later one, the simpler system design will be because system can just treat different QoS service on different carrier, 打个比喻: 如果我们需要装不同形状的货物(similar as differet service) 到车子(carriers)上, 如果只装一种形状的货物,我们可以将车子添满(good system efficiency),因为我们可以设计车箱以正好适应货物的大小. 但如果装不同形状的货物,无论你如何设计车箱,肯定会留下一些空隙(less system efficiency).
This idea is also used for long time in communication society.
For example, when we invent a service, we will design a network for it, such as, PSTN for Voice, and x.25 for data etc. Later, ITU want to design one to comprise all services-- ATM, wihich can support voice, data, multimedia and all kinds. of course, it's also very complex compared with the previous ones
(It's obvious that no one technique or man can do everything, at least, you need share something with others. This is a human socity which consist of many many perpole not one--体外话
CDMA:
CDMA20001x: data and voice could be transmitted on same carrier
CDMA2000-EVDO: data and voice are transmitted on different carrier
CDMA2000-EVDV: data and voice could be transmitted on same carrier
WCDMA:
GPRS- data and voice could be transmitted on same carrier(due to TDMA's nature)
WCDMA-data and voice could be transmitted on same carrier
HSDPA-data and voice could be transmitted on same carrier
if different services can be multiplexed and transmitted on same carrier, which means UE can be provided with voice and date service in same time.
if different services can be multiplexed and transmitted on different carrier, which means UE can be not provided with voice and date service in same time. Thus, the hard handover will be for voice and data service.
For former one, UE can gotten simultaneous services and the spectrum efficiency will be higher(from the certain aspects), for example, packet data transmission can utilize the silent period of voice call. But it will bring us more tough task, such as, how to balance these services, or how to multiplex. This is a case in WCDMA.
For later one, the simpler system design will be because system can just treat different QoS service on different carrier, 打个比喻: 如果我们需要装不同形状的货物(similar as differet service) 到车子(carriers)上, 如果只装一种形状的货物,我们可以将车子添满(good system efficiency),因为我们可以设计车箱以正好适应货物的大小. 但如果装不同形状的货物,无论你如何设计车箱,肯定会留下一些空隙(less system efficiency).
This idea is also used for long time in communication society.
For example, when we invent a service, we will design a network for it, such as, PSTN for Voice, and x.25 for data etc. Later, ITU want to design one to comprise all services-- ATM, wihich can support voice, data, multimedia and all kinds. of course, it's also very complex compared with the previous ones
(It's obvious that no one technique or man can do everything, at least, you need share something with others. This is a human socity which consist of many many perpole not one--体外话
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antoniuslv
发布于2006-10-23 11:18:53
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胡思乱想：
我觉得现在很多技术的发展都是在以前的基础上根据新的需求而不断的完善的过程，无论如何变化，本质的思想或者说思路都没有改变。但是，如果哪一天，有一种全新的截然不同的解决思路出现，那么可能会有新的变化，有些矛盾和不统一都会迎刃而解的。
因为根本思想不同而不同的解决方法，极端的例子，比如，对于物理学上一个电子自旋的值的预测，不同的认识会有截然不同的结论的。
「上帝不会掷骰子」是着名物理学家爱因斯坦的名言。要正确了解这个命题的真正涵意，还需要回到他之所以提出的背景。那就是二十世纪上半期量子力学的诞生和成熟期。物理学家们发现，对一个量子系统作单个测量，在原则上不能得到精确的结果，而只能得到获得某种结果的概率是多少。例如，如果对一个没有被「极化」的电子进行量子力学测量，我们可以得到自旋±1/2的概率各为1/2，却不能准确预期电子自旋的值究竟为＋1/2，或为－1/2。
对於量子力学测量的上述不可精确预期性或随机性存在好几种不同的解释。其中有两个主要的派别。一是所谓「正统派」，或「哥本哈根学派」，由大多数量子物理学家所持守。二是以爱因斯坦为代表的少数非正统派。「正统派」以为量子力学（包括量子力学测量）对微观物理系统的描述是完备的。言下之意，随机性或不可精确预期性是客观物理世界的一个根本方面。爱因斯坦至死都不接纳这种观点。他认为量子力学的描述是不完备的。言下之意，随机性或不可精确预期性不是客观物理世界的根本方面，只不过是人们对它的认识不完备而已。「上帝不会掷骰子」正是爱因斯坦用宗教的术语来表达他对量子力学和客观物理世界的根本看法。
从哲学来看，爱因斯坦与「正统派」的争论，焦点并非客观物理世界是否存在秩序和规律（这几乎是所有科学家的共识）。关键在於：这个井然有序的客观世界究竟是完全决定性的，还是为机会、发展、新颖性以及人的自由和神的作为留有实实在在的空间？爱因斯坦显然属於前者。在这一点上，他与另一位着名物理学家牛顿几乎一致，但与其他大多数量子物理学家相反。
爱因斯坦对量子力学与客观物理世界的看法与他的神观或宗教观有密切的关联。爱因斯坦是一位有神论者，但却不是一名基督徒，也不是一名犹太教徒。这是因为，他所相信的神，是超一流的数学家，无限智慧者，但却不是圣经所启示或基督徒所信奉的神。爱因斯坦的神是不吃人间烟火的，更不会为人类的罪，降世为人，死在十字架上，又从死里复活，叫一切相信的，不至灭亡，反得永生。