ITU-T E.770-1993 陆地移动和固定网互连话务服务等级(GOS)概念 Land Mobile and Fixed Network Interconnection Traffic Grade of Service Concept - Telephone Network a

pdf标准 ITU-T E.770-1993 陆地移动和固定网互连话务服务等级(GOS)概念 Land Mobile and Fixed Network Interconnection Traffic Grade of Service Concept - Telephone Network a

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ITU-T E.770-1993 陆地移动和固定网互连话务服务等级(GOS)概念 Land Mobile and Fixed Network Interconnection Traffic Grade of Service Concept - Telephone Network a 第 1 页 ITU-T E.770-1993 陆地移动和固定网互连话务服务等级(GOS)概念 Land Mobile and Fixed Network Interconnection Traffic Grade of Service Concept - Telephone Network a 第 2 页 ITU-T E.770-1993 陆地移动和固定网互连话务服务等级(GOS)概念 Land Mobile and Fixed Network Interconnection Traffic Grade of Service Concept - Telephone Network a 第 3 页 ITU-T E.770-1993 陆地移动和固定网互连话务服务等级(GOS)概念 Land Mobile and Fixed Network Interconnection Traffic Grade of Service Concept - Telephone Network a 第 4 页 ITU-T E.770-1993 陆地移动和固定网互连话务服务等级(GOS)概念 Land Mobile and Fixed Network Interconnection Traffic Grade of Service Concept - Telephone Network a 第 5 页
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国外分类,ITU,ITU-T(电信标准分局),itu,陆地,移动,固定,互连,话务,服务,等级,gos,概念,land,mobile,and,fixed,network,interconnection,traffic,grade,of,service,concept,telephone,network

INTERNATIONAL TELECOMMUNICATION UNION )45 4 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU % (03/93) 4%,%0(/.% .%47/2+ !.$ )3$. 15!,)49 /& 3%26)#% .%47/2+ -!.!'%-%.4 !.$ 42!&&)# %.').%%2).' ,!.$ -/"),% !.$ &)8%$ .%47/2+ ).4%2#/..%#4)/. 42!&&)# '2!$% /& 3%26)#% #/.#%04 )45 4 Recommendation % (Previously “CCITT Recommendation”) FOREWORD The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the International Telecommunication Union. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, established the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. ITU-T Recommendation E.770 was prepared by the ITU-T Study Group II (1988-1993) and was approved by the WTSC (Helsinki, March 1-12, 1993). ___________________ NOTES 1 As a consequence of a reform process within the International Telecommunication Union (ITU), the CCITT ceased to exist as of 28 February 1993. In its place, the ITU Telecommunication Standardization Sector (ITU-T) was created as of 1 March 1993. Similarly, in this reform process, the CCIR and the IFRB have been replaced by the Radiocommunication Sector. In order not to delay publication of this Recommendation, no change has been made in the text to references containing the acronyms “CCITT, CCIR or IFRB” or their associated entities such as Plenary Assembly, Secretariat, etc. Future editions of this Recommendation will contain the proper terminology related to the new ITU structure. 2 In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. © ITU 1994 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. CONTENTS Recommendation E.770 (03/93) Page 1 Introduction .................................................................................................................................................... 1 2 GOS concept .................................................................................................................................................. 1 3 Principles to allocate GOS targets.................................................................................................................. 1 4 Principles to select GOS land mobile and fixed network interconnection parameters................................... 3 5 History............................................................................................................................................................ 3 Recommendation E.770 (03/93) i Recommendation E.770 Recommendation E.770 (03/93) LAND MOBILE AND FIXED NETWORK INTERCONNECTION TRAFFIC GRADE OF SERVICE CONCEPT (Helsinki, 1993) 1 Introduction This Recommendation outlines the general considerations for land mobile and fixed network interconnection trafficability performance concept and provides guidelines for selecting GOS (Grade of Service) parameters. In this Series of Recommendations, the term GOS always refers to traffic Grade of Service parameters as defined in Recommendation E.600. GOS parameters effects on other traffic independent, user-perceived effects such as unavailability, service integrity and radio/service coverage contribute to the Quality of Service (QOS). The variation of the transmission quality of the channel may depend on how resources in the radio interface are engineered and managed (i.e. may be traffic related) and may affect QOS. The relationship (or trade-off) between trafficability performance and transmission performance is for further study (E.800). Land mobile and fixed network interconnection GOS parameters are given in subsequent Recommendations in the E.770-Series. 2 GOS concept General concepts expressed in Recommendation E.720 are also applicable to land mobile and fixed network interconnection. However, peculiarities of the radio interface, such as variable transmission quality of the channel during the course of the same connection and the need of spectrum reuse to cope with traffic demand, as in the case of cellular systems, impact traffic GOS parameters in a unique way. The users of telecommunications services supported through mobile/fixed network interconnection can experience the effects of GOS parameters depending on their perception of events such as those listed under points 1) to 3) in Recom

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