1、STDmITU-R RECMN M.1035-ENGL 1997 m 4855212 0532241 001 m Rec. ITU-R M.1035 139 RECOMMENDATION ITU-R M. 1035 FRAMEWORK FOR THE RADIO INTERFACE(S) AND RADIO SUBSYSTEM FUNCTIONALITY FOR INTERNATIONAL MOBILE TELECOMMUNICATIONS-2000 (IMT-2000) (Question ITU-R 3918) (1994) The IT Radiocommunication Assemb
2、ly, recommends that the elements addressed in this Recommendation be considered as the initial framework of concepts and principles regarding the International Mobile Telecommunications-2000 (IMT-2000) radio interface(s) and radio sub-system functionality. In particular the Recommendation addresses
3、three key factors: - - - the concept of radio interface(s) based on core elements common to all interfaces and extensions to these elements; the establishment of transmission independent and transmission dependent aspects of the interace(s); the adoption of a flexible layered cell structure. The Rec
4、ommendation refines the concept of IMT-2000 and will be used to guide future Recommendations that will specify IMT-2000 in more detail. TABLE OF CONTENTS 1. 2. 3. 4. 5. 6. 7. 8. Introduction Scope Structure of the Recommendation . . . . . . Related documents . . . . . . . . . . . ._ ._. . . . . . .
5、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Definitions . . . . ._ . . . . Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Radio interface(s) definition and characteristics 7.1 Commonality of the radio interface(s) 7.2 Layered approach to commonality 7.3 Building block approach to c
7、ommonality . 7.4 Approaches to achieve commonality . . . . . . Protocol outline . . . . . . . . 8.1 Physical layer 8.2 Medium access control layer 8.3 Link access control layer 8.4 Functional groups . Page 141 141 141 142 142 142 143 143 144 144 145 147 147 148 148 148 COPYRIGHT International Teleco
8、mmunications Union/ITU RadiocommunicationsLicensed by Information Handling ServicesSTD-ITU-R RECMN M.3035-ENGL 3997 m 4855232 0532242 T48 m 140 Rec . ITU-R M.1035 9 . Channel structure . 9.1 Radio-frequency channel (RF channel) 9.2 Physical channels 9.3 Logical channels . 9.3.1 Control channels . 9.
9、3.1.1 Common control channels 9.3.1.2 Dedicated control channels . 9.3.2 Traffic channels 9.4 Frame structure . 9.5 Multiplexing . 10 . Cellular aspects 10.1 Cell description . 10.1.1 Mega (satellite) cells . 10.1.2 Macro cells 10.1.3 Micro cells 10.1.4 Pico cells . 10.2 Cell coverage extension 10.3
10、 Multi-layered cell features 10.3.1 Multi-operator considerations . 10.3.2 Handover . 10.3.3 Cell layer selection Link control and system management functions 11.1 Radio link quality measurements 11.2 Cell selection 1 1.2.1 Initial cell selection . 11.2.2 Cell re-selection 1 1.3 Channel selectiodass
11、ignment . 11.4 Channel access and release . 1 1.5 Handover 1 1.5.1 Types of handover 11.5.2 Handover strategies . 1 1.5.3 Handover process 1 1.5.3.1 Handover evaluation . 11.5.3.2 Handover execution 11.6 Functions supporting mobility 11.6.1 Logon and logoff 1 1.6.2 Location updating . System perform
12、ance issues 12.1 Interference control . 12.1.1 Synchronisation . 12.1.2 Power control 12.1.3 Radio resource management strategies . 12.2 Diversity strategies . 12.3 Variable data rate control 12.4 Capacity improvements techniques 12.5 Battery saving techniques . 11 . 12 . Page 148 148 148 149 149 15
13、0 151 151 151 151 152 152 153 153 154 154 154 154 154 154 154 154 155 155 155 155 156 156 156 156 156 156 157 157 157 157 157 158 158 158 158 158 158 159 159 159 COPYRIGHT International Telecommunications Union/ITU RadiocommunicationsLicensed by Information Handling ServicesSTD-ITU-R RECMN M-1035-EN
14、GL 1997 m 4855232 0532243 q8q m Rec. ITU-R M.1035 141 1. Introduction International Mobile Telecommunications-2000 (IMT-2000) are third generation mobile systems (TGMS) which are scheduled to start service around the year 2000 subject to market considerations. They will provide access, by means of o
15、ne or more radio links, to a wide range of telecommunication services supported by the fixed telecommunication networks (e.g . PSTNASDN), and to other services which are specific to mobile users. A range of mobile terminal types is encompassed, linking to terrestrial andor satellite based networks,
16、and the terminals may be designed for mobile or fixed use. Key features of IMT-2000 are: - high degree of commonality of design worldwide, - compatibility of services within IMT-2OOO and with the fixed networks, - high quality, - use of a small pocket-terminal with worldwide roaming capability. IMT-
17、2000 are defined by a set of interdependent IT Recommendations of which this one is a member. This Recommendation forms part of the process of specifying the radio interface(s) of IMT-2000. IMT-2000 will operate in the worldwide bands identified by the World Administrative Radio Conference for Deali
18、ng with Frequency Allocations in Certain Parts of the Spectrum (Malaga-Torremolinos, 1992) (WARC-92) (1 885-2025 and 2 110-2200 MHz, with the satellite component limited to 1980-2010 and 2 170-2200 MHz). The subject matter of IMT-2000 is complex and its representation in the form of Recommendations
19、is evolving. To maintain the pace of progress on the subject it is necessary to produce a sequence of Recommendations on a variety of aspects. The Recommendations strive to avoid apparent conflicts between themselves. Future Recommendations, or revisions, will be used to resolve any discrepancies. 2
20、. Scope The purpose of this Recommendation is to present an overview of the radio subsystem for IMT-2000 and give guidelines for the development of the structure of the radio sub-system. The radio sub-system includes the functionalities needed to provide IMT-2000 services over a radio interface(s) t
21、o mobile terminals in all IMT-2000 operating environments, as defined in Recommendation ITU-R M. 1034 on Requirements for the radio interface(s) for International Mobile Telecommunications-2000 (IMT-2000). The Recommendation provides a high-level definition of logical elements and functionalities wi
22、thin the radio sub-system, including the radio interface, channel structure, link control and radio system management functions. In addition, this Recommendation identifies areas which are to be specified in detail in subsequent Recommendations. 3. Structure of the Recommendation In 8 4 issues relat
23、ing to other Recommendations are discussed. Section 5 addresses definitions. Section 6 states the considerations that have been taken into account in the production of this Recommendation. In $ 7 the radio interface(s) is defined and charactensed. Section 8 outlines the protocol structure. Section 9
24、 outlines the channel structure and multiplexing. Section 10 outlines the cellular structure and related issues. Section 11 outlines the link control and system management functions, which include link quality measurement, channel selectiorassignment, handover and mobility supporting functions. Fina
25、lly, Section 12 is a collection of specific issues that need to be addressed as a part of the radio sub-system specification in order to meet the system performance requirements. COPYRIGHT International Telecommunications Union/ITU RadiocommunicationsLicensed by Information Handling ServicesSTD-ITU-
26、R RECMN M.1035-ENGL L777 m 4855212 0532244 810 m 142 Rec. ITU-R M.1035 4. Related documents - Recommendation ITU-R M.687: International Mobile Telecommunications-2000 (IMT-2000) - Recommendation ITU-R M.816: Framework for services supported on International Mobile Telecommunications-2000 (IMT-2000)
27、- Recommendation ITU-R M.8 17: International Mobile Telecommunications-2000 (IMT-2000). Network architectures - Recommendation ITU-R M.818: Satellite operation within International Mobile Telecommunications-2000 (IMT-2000) - Recommendation IT-R M.819: International Mobile Telecommunications-2000 (IM
28、T-2ooO) for developing countries - Recommendation ITU-R M. 1034: Requirements for the radio interface(s) for International Mobile Telecommunications-2000 (IMT-2000) - Recommendation ITU-R M. 1036: Spectrum considerations for implementation of International Mobile Telecommunications-2000 (IMT-2000) i
29、n the bands 1885-2025 MHz and 2 110-2 200 MHZ - Recommendation ITU-R M.1079: Speech and voice band data performance requirements for Intemational Mobile Telecommunications-2000 (IMT-2000) Guidelines for evaluation of radio transmission technologies for IMT-2000 - Recommendation ITU-R M.1225: 5. Defi
30、nitions The terms used in this Recommendation are consistent with definitions used in other ITU-R Recommendations regarding IMT-2000. 6. Considerations In the development of this Recommendation the following considerations, inter alia, have been taken into account: a) the relevant ITU-R and ITU-T Re
31、commendations and ongoing studies; b) event to ensure that the overall cost per mobile user is significantly less than it is with present systems; that system compatibility is necessary for international operation, and that commonality is desirable in any c) readily to environmental factors and to r
32、espond to new developments without restricting innovation; the need for a flexible system structure able to match network investment to the revenue growth, to adapt d) the need for mobile stations (including those with satellite capability) to roam between mobile telecommunication networks in differ
33、ent countries; e) that standardised ra$o interface(s) would facilitate the roaming of mobile stations between networks; 0 and attractiveness of the services; that satellite operation within IMT-2000 holds the possibility of significantly enhancing the overall coverage g) and between countrieslregion
34、s; the increasing importance of spectrum efficiency and the need for ease of spectrum management, both within h) and features not envisaged yet. the radio interface(s) should be designed with scope for innovation, for example the later inclusion of services COPYRIGHT International Telecommunications
35、 Union/ITU RadiocommunicationsLicensed by Information Handling ServicesSTD-ITU-R RECMN M=3035-ENGL 3997 m 4855232 0532245 757 m Rec. ITU-R M.1035 143 7. Radio interface(s) definition and characteristics The iMT-2000 radio interface is the means of realising the wireless electromagnetic interconnecti
36、on between an IMT-2ooO mobile station (or mobile earth station) and an IMT-2000 base station (or space station). The IMT-2000 radio interface specification consists of a statement of the form and content of the signals transmitted from stations. The specification contains the definition of functiona
37、l characteristics, common radio (physical) interconnection characteristics, signal characteristics, and other characteristics, as appropriate. It should be noted that the satellite operating characteristics have many differences to the terrestrial operating characteristics. See 0 10.1 for details on
38、 the satellite operating characteristics. 7.1 Commonality of the radio interface(s) IMT-2000 may need to use more than one radio interface in order to meet various operating environment or application needs. However, IMT-2000 users may want the ability to use one terminal to access a given set of se
39、rvices in more than one operating environment. It is desirable to minimise the number of radio interfaces. If multiple interfaces are needed, the degree of commonality between these interfaces should be maximised. Minimising the number of radio interfaces and maximising commonality between different
40、 radio interfaces would facilitate inter-operability while minimising cost. Maximising commonality would also facilitate the incorporation of different radio interfaces into a single portable terminal at a reasonable cost. Commonality is defined as a common group of core elements that may or may not
41、 comprise a complete radio interface (see Fig. 1). HGURE 1 Core elements concept Radio interface B Radio interface C 7 -w - Radio interface A WX . The core elements concept should facilitate the definition of a universal platform that can be easily adapted to the various environment and service usag
42、e requirements. Manufacturers would benefit from such design if, due to the algorithmic flexibility inherent in digital systems of modular design, the adaptation capabilities are implemented as “software” reconfigurations of various modules in the transmission chain. COPYRIGHT International Telecomm
43、unications Union/ITU RadiocommunicationsLicensed by Information Handling ServicesSTD=ITU-R RECMN M.3035-ENGL 3997 m 4855232 053224b b93 144 Rec. ITU-R M.1035 It is important that IMT-2000 support terminal mobility where the same terminal can be used in all environments if desired. This means that it
44、 must be possible to move between the different environments with the same terminal. It is impractical to provide terminal mobility for all possible services in all environments; therefore, a set of basic service functions must be defined for which full terminal mobility in ail radio operating envir
45、onments is desired. A target for the IMT-2000 radio interface(s) is to support the possibility of using one low cost hand-portable terminal in a large number of operating environments with access to at least a minimum set of all services. Restrictions in terns of bandwidth, range, and complexity imp
46、ly that it may not be feasible for a single radio interface to support the use of an IMT-2 terminal in all operating environments with access to all services. In this case the number of different radio interfaces should be made as small as possible with the restriction of not imposing too high compl
47、exity. Radio interface(s) should be developed using layered and building block approaches in order to maximise commonality and allow flexibility. Radio interface specifications should allow for the use of standardised extensions to a set of interface core elements to facilitate changes in service ba
48、sed on users needs, radio environments, and other factors. The use of these extensions should also facilitate the development of new services and capabilities. 7.2 Layered approach to commonality A layered approach is used to clearly define the interface structure and protocols required to support t
49、elecommunication services. Additional advantages are identified by employing a layered approach; examples include the inter-system availability of software packages developed for signallingkommunication layers of specific systems. Another advantage identified in mobile radio communication is the ability to separate radio interface functions as transmission independent and transmission dependent. This separation may require a sub-layered structure. The set of transmission independent functions should be maximised to facilitate interoperability across di
