1、 Rec. ITU-R M.1797 1 RECOMMENDATION ITU-R M.1797*Vocabulary of terms for the land mobile service (2007) Scope This Recommendation provides a vocabulary of terms and definitions for the land mobile service which may also be applicable to other radiocommunication services. The ITU Radiocommunication A
2、ssembly, considering a) that the terrestrial mobile service applications are growing at a rapid rate; b) that new vocabulary of terms is being introduced to accommodate this growth; c) that there is a need for clear definition of terminology, used in ITU-R Recommendations and other texts in order to
3、 use them in an unambiguous way, noting a) that Recommendation ITU-R M.1224 contains vocabulary of terms for the international mobile telecommunications-2000 (IMT-2000); b) that Recommendation ITU-R F.1399 contains vocabulary of terms for wireless access; c) that Recommendation ITU-R F.592-2 contain
4、s vocabulary of terms for the fixed service; d) that Recommendation ITU-R V.573 contains terms of radiocommunications vocabulary; e) that Recommendation ITU-R V.662 contains general terms and definitions used in the International Electrotechnical Vocabulary (IEV); f) that Recommendation ITU-R V.666
5、contains abbreviations and initials used in telecommunications, recommends 1 that the vocabulary of terms and definitions in Annex 1 should be used in texts relating to the land mobile service. NOTE 1 This vocabulary may also be applicable to other radiocommunication services. *This Recommendation s
6、hould be brought to the attention of the Coordination Committee for vocabulary (CCV). 2 Rec. ITU-R M.1797 Annex 1 Vocabulary of terms for the land mobile service 1 Terms related to antennas Antenna F: antenne S: antena A: C: 天线 R: Any structure or device used to collect or radiate electromagnetic po
7、wer. Radiation pattern, antenna radiation pattern F: diagramme de rayonnement, diagramme de rayonnement de lantenne S: diagrama de radiacin de la antena A: C: 辐射方向图, 天线辐射方向图 R: , The variation of the transmitted power of an antenna in three-dimensional space, usually expressed as an angular function
8、 with respect to a reference direction. NOTE 1 A radiation pattern is usually represented graphically for the far-field conditions in either horizontal or vertical plane. Main-lobe, antenna main-lobe F: lobe principal, lobe principal dune antenne S: lbulo principal, lbulo principal de una antena A:
9、C: 主瓣, 天线主瓣 R: , The part of an antenna radiation pattern containing the direction of maximum radiation (exhibiting the greatest field strength), which is referred to as the direction of the main-lobe. NOTE 1 For a receive antenna it is the part of the receive pattern containing the direction of max
10、imum sensitivity. The width of the main-lobe is usually specified as the angle encompassed between the points where the power has fallen 3 dB below the maximum value. The horizontal radiation pattern, i.e. that which is plotted as a function of azimuth about the antenna, is usually specified. The ve
11、rtical radiation pattern, i.e. that which is plotted as a function of elevation from a specified azimuth, is also of interest and may be similarly specified. Antenna downtilt F: inclinaison de lantenne vers le bas S: inclinacin de la antena hacia abajo A: C: 天线下倾 R: Rec. ITU-R M.1797 3 Direction of
12、the main-lobe of an antenna in the downward direction with respect to the horizontal plane. NOTE 1 The antenna downtilt can be accomplished either mechanically or electrically, and if both are implemented their effect is additive. Downtilt angle, antenna downtilt angle F: angle dinclinaison vers le
13、bas, angle dinclinaison de lantenne vers le bas S: ngulo de inclinacin hacia abajo, ngulo de inclinacin de la antena hacia abajo A: C: 下倾角度, 天线下倾角 R: , The angle between the direction of the main-lobe and the horizontal plane. NOTE 1 It is a positive number for downtilt and a negative number for upt
14、ilt. Mechanical downtilt, mechanical antenna downtilt F: inclinaison mcanique vers le bas, inclinaison mcanique de lantenne vers le bas S: inclinacin mecnica hacia abajo, inclinacin mecnica de la antena hacia abajo A: C: 机械下倾, 机械天线下倾 R: , An antenna downtilt that is accomplished by physically adjust
15、ing the mounting of the antenna structure. Electrical downtilt, electrical antenna downtilt F: inclinaison lectrique vers le bas, inclinaison lectrique de lantenne vers le bas S: inclinacin elctrica hacia abajo, inclinacin elctrica de la antena hacia abajo A: C: 电调下倾, 电调天线下倾 R: , An antenna downtilt
16、 that is accomplished by adjusting the phasing of the antenna elements, or by similar electrical means. Adaptive antenna system (AAS) F: systme dantenne adaptative (AAS) S: sistema de antena adaptativa (AAS) A: C: 自适应天线系统 R: An array of antennas and associated signal processing that together is able
17、 to change its antenna radiation pattern dynamically to adjust to noise environment, interference and multipath. NOTE 1 Adaptive arrays form an infinite number of patterns (scenario-based) that are adjusted in real-time. Adaptive antennas are one kind of smart antennas. 4 Rec. ITU-R M.1797 Adaptive
18、spatial processing F: traitement spatial adaptatif S: tratamiento espacial adaptativo A: C: 自适应空间处理 R: An advanced signal processing technique that integrates a higher level of measurement and analysis of the scattering aspects of the RF environment to maximize the use of multiple antennas, combinin
19、g signals in space in a method that transcends a one user-one beam methodology. Antenna diversity combining F: combinaison par diversit dantennes S: combinacin por diversidad de antenas A: C: 天线分集合并 R: A technique of coherently combining the signals from multiple antennas to produce an increase of t
20、he desired signal strength. NOTE 1 Diversity combining uses all antenna elements at all times for each user, creating an antenna pattern that dynamically adjusts to the propagation environment. Multibeam antenna F: antenne multi-faisceaux S: antena de haces mltiples A: C: 多波束天线 R: An antenna system
21、that uses multiple beams at an antenna site for transmission and/or reception. NOTE 1 Multibeam systems may or may not be adaptive. Multiple-input multiple-output (MIMO) F: entres multiples et sorties multiples (MIMO) ou systmes multi antennes S: entradas mltiples y salidas mltiples (MIMO) en un sis
22、tema de antenas mltiples A: C: 多端入多端出 R: (MIMO) A technique that utilizes multiple antennas on both ends of the transmit-receive channel, e.g. at both the base station and the terminal(s) in a wireless network, to provide significant improvements in the capacity or reliability of the system. NOTE 1
23、This is accomplished by exploiting the complex multipath propagation channels typically found in terrestrial mobile communications. NOTE 2 There are many alternative solutions within this family of techniques, but they are all based on using the same time and frequency (or code) resource(s) by using
24、 multiple antenna elements at both ends of the transmit-receive channel. Rec. ITU-R M.1797 5 Single-user MIMO F: systme multi-antennes ddi un usager unique S: sistema de antenas mltiples dedicado a un usuario nico A: C: 单用户多端入多端出 R: MIMO A MIMO technique in which a MIMO channel is used by multiple a
25、ntennas at both a base station and a terminal in a wireless network and this MIMO resource is solely assigned to this particular terminal. Multi-user MIMO F: systme multi-antennes ddi de multiples usagers S: sistema de antenas mltiples dedicado a mltiples usuarios A: C: 多用户多端入多端出 R: MIMO A MIMO tech
26、nique in which a MIMO channel is used by multiple antennas at both a base station and more than one terminal in a wireless network and this MIMO resource is shared by every terminal that takes part in this MIMO channel. Closed-loop MIMO F: systme multi-antennes avec boucle ferme dasservissement S: s
27、istema de antenas mltiples con control de bucle cerrado A: C: 闭环多端入多端出 R: MIMO A MIMO technique in which a MIMO transmitter uses receiver feedback to adapt its MIMO transmission to the channel condition. Smart antenna signal gain F: gain de signal dantenne intelligente S: ganancia de seal de antena
28、inteligente A: C: 智能天线信号增益 R: The increase in the desired signal strength resulting from combining inputs from multiple antennas to optimize available power required to establish given level of coverage. Smart antenna F: antenne intelligente S: antena inteligente A: C: 智能天线 R: A system of antennas t
29、hat combines multiple antenna elements with a signal-processing capability to optimize its radiation and/or reception pattern automatically in response to the signal environment. 6 Rec. ITU-R M.1797 NOTE 1 The two major categories of smart antennas, based on the choice of transmit strategy, are adap
30、tive antennas and switched-beam antennas. Space-time coding F: codage spatio-temporel S: codificacin espacio-temporal A: C: 时空编码 R: - A transmit diversity technique that takes advantage of the spatial dimension by transmitting a number of data streams using multiple co-located antennas and uses vari
31、ous coding structures and different time-slots that exploit multipath effects in order to achieve very high spectral efficiencies. Spatial diversity F: diversit despace S: diversidad espacial A: C: 空间分集 R: A technique in which the received composite signal strength from the antenna array is used to
32、minimize fading and other undesirable effects of multipath propagation. Spatial division multiple access (SDMA) F: accs multiple par rpartition dans lespace (SDMA) S: acceso mltiple por divisin en el espacio (AMDF) A: C: 空分多址接入 R: (SDMA) The use of adaptive spatial processing techniques to create in
33、dependent spatial channels for multiple access, either through smart antenna technology or multi-user MIMO. NOTE 1 This scheme can adapt the frequency allocations to where the most users are located and achieves superior levels of interference suppression, making possible more efficient reuse of fre
34、quencies than the standard fixed hexagonal reuse patterns. Steered-beam antenna system F: systme dantennes faisceaux orientables S: sistema de antenas de haces dirigibles A: C: 可控波束天线系统 R: An approach that utilizes phased-array antennas, with multiple antenna elements in pairs or equally spaced, to
35、create a narrower main beam directed only to the intended mobile on the forward link and steered towards the mobile as it moves. NOTE 1 Steered-beam antenna systems are one kind of smart antenna systems. Rec. ITU-R M.1797 7 Switched-beam antenna system F: systme dantennes faisceaux commuts S: sistem
36、a de antenas de haces conmutados A: C: 波束转换天线系统 R: An antenna system that creates a number of fixed beams at an antenna site, allowing the receiver to select the beam that provides the greatest signal enhancement and interference reduction. NOTE 1 Switched beam systems form a finite number of fixed,
37、 predefined patterns or combining strategies (sectors). NOTE 2 Switched beam systems can be thought of as a “micro-sectorization” strategy. Switched diversity F: diversit par commutation S: diversidad por conmutacin A: C: 交换分集 R: A technique of switching the receive channel to one of multiple antenn
38、as to select the antenna with the maximum signal strength. 2 Terms related to public protection and disaster relief Public protection (PP) radiocommunication F: radiocommunications pour la protection du public (PP) S: radiocomunicaciones para la proteccin pblica (PP) A: C: 公共保护无线电通信 R: Radiocommunic
39、ation used by responsible agencies and organizations dealing with maintenance of law and order, protection of life and property, and emergency situations. Disaster relief (DR) radiocommunication F: radiocommunications pour les secours en cas de catastrophe (DR) S: radiocomunicaciones para operacione
40、s de socorro (DR) A: C: 灾害防护无线电通信 R: Radiocommunication used by agencies and organizations dealing with a serious disruption of the functioning of society, posing a significant, widespread threat to human life, health, property or the environment, whether caused by accident, nature or human activity
41、, and whether developing suddenly or as a result of unexpected complex, long-term process. 8 Rec. ITU-R M.1797 3 Terms related to intelligent transport systems Intelligent transport systems (ITS) F: systmes de transport intelligents (STI) S: sistemas de transporte inteligentes (ITS) A: C: 智能交通系统 R:
42、Systems utilizing the combination of computers, communications, positioning, and automation technologies to improve the safety, management, and efficiency of terrestrial transportation. Dedicated short-range communications (DSRC) F: communications spcialises courte distance (DSRC) S: comunicaciones
43、especializadas de corto alcance (DSRC) A: C: 专用短距离通信 R: Wireless techniques to transfer data over short distances between roadside and mobile radio units, between mobile units, and between portable and mobile units to perform operations related to the improvement of traffic flow, and traffic safety. Vehicle information and communication system (VICS) F: systme dinformation et d
