ITU-R M 1635-2003 General methodology for assessing the potential for interference between IMT-2000 or systems beyond IMT-2000 and other services《IMT-2000 超IMT-2000及其它业务之间的可能干扰评定的通.pdf
《ITU-R M 1635-2003 General methodology for assessing the potential for interference between IMT-2000 or systems beyond IMT-2000 and other services《IMT-2000 超IMT-2000及其它业务之间的可能干扰评定的通.pdf》由会员分享,可在线阅读,更多相关《ITU-R M 1635-2003 General methodology for assessing the potential for interference between IMT-2000 or systems beyond IMT-2000 and other services《IMT-2000 超IMT-2000及其它业务之间的可能干扰评定的通.pdf(13页珍藏版)》请在麦多课文档分享上搜索。
1、 Rec. ITU-R M.1635 1 RECOMMENDATION ITU-R M.1635 General methodology for assessing the potential for interference between IMT-2000 or systems beyond IMT-2000 and other services (2003) Summary Consideration of the potential for interference between IMT-2000 and systems beyond IMT-2000 and other servi
2、ces is essential for administrations in planning the use of frequency bands where the mobile service exists on a co-primary basis with other services. Networks of IMT-2000 and systems beyond IMT-2000 are likely to accommodate significant numbers of cellular customers and hence networks will require
3、significant transmission capacity, involving the deployment of high-density infrastructures. This needs to be considered in analysis to assess sharing between IMT-2000 and systems beyond IMT-2000 and other services. This Recommendation provides recommendations for administrations for a methodology f
4、or assessing the potential for interference between IMT-2000 and systems beyond and other services under co-frequency as well as adjacent band conditions. The ITU Radiocommunication Assembly, considering a) that shared use of the frequency spectrum is supportive for the general objective of efficien
5、t use of the spectrum; b) that due to congestion in frequency bands suitable for broadband mobile service applications shared use of the spectrum with other services has to be considered as one possible option; c) that shared use of frequency bands by IMT-2000 and/or systems beyond IMT-2000 and othe
6、r services needs careful consideration of the coexistence conditions concerned; d) that reducing the necessary guardband to services operated in frequency bands adjacent to IMT-2000 to the greatest extent possible is a supportive measure to improve efficient use of the spectrum, recognizing a) that
7、IMT-2000 and its enhancements will continue to operate in the bands identified by the ITU at WARC-92 and WRC-2000; b) that the further development of systems beyond IMT-2000 may require spectrum in addition to that now identified for IMT-2000; 2 Rec. ITU-R M.1635 c) that the suitable frequency range
8、s for systems beyond IMT-2000 that support broadband wide area full mobility services may be, among others, the ones that are not far away from the existing frequency bands identified for IMT-2000; d) that the additional spectrum is requested especially in densely populated regions; e) that Recommen
9、dation ITU-R M.1461 provides a methodology for conducting sharing studies between the radiodetermination service and other services, recommends 1 that the procedures in Annex 1 be used for assessing the potential for interference between IMT-2000 and systems beyond IMT-2000 and systems in other serv
10、ices under co-frequency as well as adjacent band conditions taking into account other relevant ITU-R Recommendations on the subject of interference assessment concerning the services under consideration. Annex 1 General methodology for assessing the potential for interference between IMT-2000 or sys
11、tems beyond IMT-2000 and other services 1 Introduction Consideration of potential for interference between IMT-2000 and systems beyond IMT-2000 and other services is essential for administrations in planning the use of frequency bands where the mobile service exists on a co-primary basis with other
12、services or in adjacent frequency bands. This Annex describes the principles of a compatibility assessment methodology in order to perform sharing studies between the mobile service and other services in co-frequency and adjacent band scenarios. This methodology covers worst-case considerations as w
13、ell as a more representative approach, in order to get a full picture of the interference scenarios under consideration. Parts of the assessment procedures need to be based on a statistical methodology, well known as the Monte Carlo technique. The results may be focused on the cumulative distributio
14、ns of I/N or C/I at the receivers of the applications concerned, in order to demonstrate the probability of interference. The equations in this Annex describe a general calculation methodology. The units for the parameters in the equations must be consistent when they are applied to a specific study
15、. 2 Interference assessment methodology In order to perform sharing studies between mobile services and other services in co-frequency and adjacent band scenarios, simulation models need to be applied analysing the different parts of the interference path: transmitter, receiver, antennas, propagatio
16、n. Rec. ITU-R M.1635 3 On the other hand, it is necessary to operate with assumptions concerning future mature deployments of the mobile networks and applications in other services, in the phase before rolling out these networks. This allows at an early stage to achieve results which are as realisti
17、c as possible. Since interference scenarios between various applications may be analysed using this methodology, the concept of calculating the power spectral density at a victim receiver should be applied. This allows consideration of all kinds of modulation and bandwidth combinations, as well as t
18、he various requirements concerning the tolerable interference levels. The methodologies to model the different parts of the interference path should be based on ITU-R Recommendations to the extent possible. 2.1 Interference level at victim receiver 2.1.1 Assessing the power spectral density at a vic
19、tim receiver The power spectral density of an interfering signal at a victim receiver is a key element of the interference calculation process. Due to the large variety of interference spectra and receivers to be considered in assessing the potential of interference between the mobile service and ot
20、her services in co-frequency sharing as well as adjacent frequency band consideration, the concept of power spectral density calculation gives the most flexible approach. All kinds of combinations of frequency spectra and receiver selectivity may be applied in order to assess the potential for inter
21、ference between systems in the mobile service and other services. Thus the method for calculation of the interference power spectral density at the input of a victim receiver is the essential part in any compatibility assessment. The receiving power density spectrum at a victim receiver can be obtai
22、ned from the following algorithm: ),()()()()()(),(pfLRRfSPMGGfPpfPbRxTxRxRxTxTxRx= (1) where: PRx( f, p) : interfering power density spectrum at receiver PTx( f ) : transmitter output power spectral density GTx() : gain of the transmitting antenna in the direction of the receiver GRx() : gain of the
23、 receiving antenna in the direction of the transmitter PMRx() : polarization mismatch factor of receiving antenna S( f ) : selectivity of receiver RTx: feeder loss of transmitting antenna Rx: feeder loss of receiving antenna Lb( f, p) : attenuation due to propagation effects f : frequency p : percen
24、tage of time : angle between the transmitting antenna boresight and the receiving antenna : angle between receiving antenna boresight and the transmitting antenna 4 Rec. ITU-R M.1635 with the isolation between transmitter and receiver: ),()()()()(pfLRRPMGGpIbRxTxRxRxTxS= (2) where: IS ( p) : isolati
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ITURM16352003GENERALMETHODOLOGYFORASSESSINGTHEPOTENTIALFORINTERFERENCEBETWEENIMT2000ORSYSTEMSBEYONDIMT2000ANDOTHERSERVICESIMT2000

链接地址:http://www.mydoc123.com/p-791820.html