杞嚜錛?A >http://www.mvista.com.cn/svu-www/index4/index4-9.htm
weidagang2046 2005-07-01 10:06 鍙戣〃璇勮
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銆銆浜ゆ崲铏氱數璺紙SVC錛夋槸鎸囬氫俊鍙屾柟鐨勭數璺湪鐢ㄦ埛鐪嬫潵鏄敱鐙珛鑺傜偣涓存椂涓斿姩鎬佽繛鎺ョ殑铏氱數璺備竴鏃﹂氫俊浼氳瘽瀹屾垚錛屼究鍙栨秷铏氱數璺?
杞嚜錛?A >http://www.networkdictionary.com/chinese/networking/VirtualCircuits.php
weidagang2046 2005-06-30 13:43 鍙戣〃璇勮
]]>I would like the group to reconsider the definition of spectrum efficiency in draft-ietf-rohc-rtp-01.txt and whatever other drafts may use this definition. I believe this definition is overly cellular specific and somewhat inaccurate.
?Spectrum efficiency
Radio resources are
used efficiently to
cellular systems this is achieved by maximizing the number of users
served within each cell, while the quality of the provided services
is kept at an acceptable level. A consequence of efficient spectrum
use is a high rate of errors (frame loss and residual bit errors),
even after channel coding with error correction.?
I suggest the following:
Spectrum Utilization (Cellular)
Radio resources are
used efficiently to
cellular systems this is achieved by maximizing the number of users
served within each cell, while the quality of the provided services
is kept at an acceptable level.
I suggest removing the following statement, as I believe this is more a statement of the way cellular system maximize the revenue producing aspects of spectral utilization.
?A consequence of efficient spectrum
use is a high rate of errors (frame loss and residual bit errors),
even after channel coding with error correction.?
I believe this may be a better definition for spectrum efficiency:
Spectrum efficiency
The amount of useful information that can be transmitted over a given spectrum (bandwidth) over a given period of time. For modem designers, spectrum efficiency is defined as the amount of bits per second per bandwidth. For packet communications systems, bandwidth efficiency can be defined as the amount of useful user packet transmitted per second per bandwidth excluding overhead. The difference being that one can have a network with good spectral efficiency at layer at two that results in a poor spectral efficiency when considering layer three. For a given BER, burst errors are more desirable than a binomial distribution of errors when considering packet communications.
Will Ivancic
from: http://www1.ietf.org/mail-archive/web/rohc/old-archive/msg00579.html
weidagang2046 2005-06-22 13:07 鍙戣〃璇勮
]]>weidagang2046 2005-06-22 11:43 鍙戣〃璇勮
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