1、 Report ITU-R M.2146(05/2009)Coexistence between IMT-2000 CDMA-DS and IMT-2000 OFDMA-TDD-WMAN in the 2 500-2 690 MHz band operating in adjacent bands in the same areaM SeriesMobile, radiodetermination, amateurand related satellite servicesii Rep. ITU-R M.2146 Foreword The role of the Radiocommunicat
2、ion Sector is to ensure the rational, equitable, efficient and economical use of the radio-frequency spectrum by all radiocommunication services, including satellite services, and carry out studies without limit of frequency range on the basis of which Recommendations are adopted. The regulatory and
3、 policy functions of the Radiocommunication Sector are performed by World and Regional Radiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR) ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/
4、ISO/IEC referenced in Annex 1 of Resolution ITU-R 1. Forms to be used for the submission of patent statements and licensing declarations by patent holders are available from http:/www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO/
5、IEC and the ITU-R patent information database can also be found. Series of ITU-R Reports (Also available online at http:/www.itu.int/publ/R-REP/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT Broadcasti
6、ng service (television) F Fixed service M Mobile, radiodetermination, amateur and related satellite services P Radiowave propagation RA Radio astronomy RS Remote sensing systems SA Space applications and meteorology SF Frequency sharing and coordination between fixed-satellite and fixed service syst
7、ems SM Spectrum management Note: This ITU-R Report was approved in English by the Study Group under the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva, 2009 ITU 2009 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without written
8、permission of ITU. Rep. ITU-R M.2146 1 REPORT ITU-R M.2146 Coexistence between IMT-2000 CDMA-DS and IMT-2000 OFDMA-TDD-WMAN in the 2 500-2 690 MHz band operating in adjacent bands in the same area (2009) 1 Introduction and scope The 2 500-2 690 MHz band has been identified as a frequency band that a
9、dministrations may choose to make available for IMT-2000. Consequently, ITU-R has undertaken sharing studies in the 2 500 MHz to 2 690 MHz band between IMT-2000 systems and other services as required by Resolution 223 (WRC-07). Report ITU-R M.2030 Coexistence between IMT-2000 time division duplex an
10、d frequency division duplex terrestrial radio interface technologies around 2 600 MHz operating in adjacent bands and in the same geographical area, focused on coexistence analysis for sharing between TDD-based and FDD-based IMT-2000 systems, specifically CDMA-DS and CDMA-TDD, operating in adjacent
11、bands. Report ITU-R M.2045 Mitigating techniques to address coexistence between IMT-2000 time division duplex and frequency division duplex radio interface technologies within the frequency range 2 500-2 690 MHz operating in adjacent bands and in the same geographical area, addressed mitigation tech
12、niques to enable harmonious coexistence of these technologies. Report ITU-R M.2113 Sharing studies in the 2 500-2 690 MHz band between IMT-2000 and fixed broadband wireless access systems including nomadic applications in the same geographical area, addressed both coexistence analysis and mitigation
13、 of sharing between IMT-2000, specifically CDMA-DS and CDMA-TDD and broadband wireless access systems that support fixed and/or nomadic applications. With the incorporation of OFDMA-TDD-WMAN as the 6th IMT-2000 radio interface, a study of coexistence between OFDMA-TDD-WMAN and other components of IM
14、T-2000 is appropriate to extend the analysis provided in Report ITU-R M.2030. This Report addresses coexistence between the OFDMA-TDD-WMAN and CDMA-DS components of IMT-2000. 2 Interference scenarios to be analysed Deployment of IMT-2000 OFDMA-TDD-WMAN, a mobile broadband wireless acess (MBWA) syste
15、m based on standards developed by IEEE 802.161, adjacent to other IMT-2000 systems in the same area in the 2 500-2 690 MHz band is likely to create similar adjacent channel interference situations as those addressed in Reports ITU-R M.2030 and ITU-R M.2045 due to inherent similarities of these syste
16、ms as far as the sharing characteristics are concerned. For instance, both systems will be deployed in multi-cell, wide-area deployments with base station transmitter heights and power levels in accordance with such deployments. 1Working Group IEEE 802.16 has developed and published standards IEEE S
17、td 802.16-2004 titled “IEEE standard for local and metropolitan area networks Part 16: Air interface for fixed broadband wireless access systems”, and its amendment to include mobility IEEE Std 802.16e-2005 entitled “Amendment to IEEE standard for local and metropolitan area networks Part 16: Air in
18、terface for fixed broadband wireless access systems Physical and medium access control layers for combined fixed and mobile operation in licensed bands”. 2 Rep. ITU-R M.2146 Adjacent-channel sharing of a frequency band by two systems deployed in the same area creates the following four general cases
19、 for potential interference, which are not necessarily similar in terms of severity and likelihood of interference. a) Base to base b) Base to subscriber c) Subscriber to base d) Subscriber to subscriber. This Report contains two analyses of the impact of adjacent channel interference (ACI) between
20、a CDMA-DS system and an OFDMA-TDD-WMAN system. In one analysis OFDMA-TDD-WMAN is deployed with 5 MHz channels, and in the other with 10 MHz channels. The analysis of the systems operating in 5 MHz channels is extended to consider the benefits of mitigation techniques. The interference paths that can
21、 exist when these two technologies operate in adjacent spectrum are as follows: Interference from a CDMA-DS base station to an OFDMA-TDD-WMAN base station. Interference from a CDMA-DS base station to an OFDMA-TDD-WMAN mobile station. Interference from a CDMA-DS mobile station to an OFDMA-TDD-WMAN ba
22、se station. Interference from a CDMA-DS mobile station to an OFDMA-TDD-WMAN mobile station. Interference from an OFDMA-TDD-WMAN base station to a CDMA-DS base station. Interference from an OFDMA-TDD-WMAN base station to a CDMA-DS mobile station. Interference from an OFDMA-TDD-WMAN mobile station to
23、a CDMA-DS base station. Interference from an OFDMA-TDD-WMAN mobile station to a CDMA-DS mobile station. Note that not all of these interference paths result in significant interference in any given configuration. For example, if the OFDMA-TDD-WMAN channel is adjacent to the CDMA-DS FDD downlink chan
24、nel, then only interference Paths 1, 2, 6 and 8 are relevant. Alternatively, when the OFDMA-TDD-WMAN channel is adjacent to the CDMA-DS FDD uplink channel, then only interference Paths 3, 4, 5 and 7 are relevant. In the interference analysis, the OFDMA-TDD-WMAN and CDMA-DS systems are modelled as op
25、erating in a macrocellular network. Additionally, the deterministic analysis includes microcellular and indoor picocellular deployment scenarios for the CDMA-DS system only. 3 Modelling of inter-system interference: ACLR, ACS and ACIR The only form of interference modelled in this study is ACI that
26、arises from the adjacent channel leakage (ACLR) from base station and mobile station transmissions in the OFDMA-TDD-WMAN and CDMA-DS systems and the adjacent channel selectivity (ACS) of the base station and mobile station receivers in the OFDMA-TDD-WMAN and CDMA-DS systems and the ability of these
27、receivers to reject power legitimately transmitted in the adjacent channel. Given the transmitted powers, path losses in the selected scenarios and the ACLR and ACS performances of the base stations and mobile stations in each system, the effective interference may be calculated. Additionally, the e
28、ffective interference is also calculated with and without the benefit of mitigation techniques. This interference is compared with the protection criteria (outlined in 5.3, 6.2.8 and 6.2.9) to determine whether the systems are adequately protected. Our results are presented in 5, 6 and 7. The level
29、of interference received depends on the spectral “leakage” of the interferers transmitter and the adjacent channel performance of the receiver. For the transmitter, the spectral leakage is characterized by the ACLR, which is defined as the ratio of the transmitted power to the power measured in the
30、adjacent radio frequency (RF) channel at the output of a receiver filter. Rep. ITU-R M.2146 3 Similarly, the adjacent channel performance of the receiver is characterized by the ACS, which is the ratio of the power level of unwanted ACI to the power level of co-channel interference that produces the
31、 same bit error ratio (BER) performance in the receiver. In order to determine the composite effect of the transmitter and receiver imperfections, the ACLR and ACS values are combined to give a single adjacent channel interference ratio (ACIR) value using the equation (1)2: ACS1ACLR11ACIR+= (1) 4 Ba
32、sic system characteristics Sections 5, 6 and 7 contain analyses of the impact of ACI between a CDMA-DS system and a TDD system, namely, OFDMA-TDD-WMAN, which is based on IEEE 802.16-2004 OFDM/OFDMA and its amendment IEEE 802.16e-20053, 4. First the basic parameters and characteristics of these syste
33、ms are described. Unless otherwise stated in the text, these are the definitions that are used in the analysis below for System B. 4.1 OFDMA-TDD-WMAN Parameters of MBWA systems, including 5 MHz OFDMA-TDD-WMAN, for use in sharing studies are given in Report ITU-R M.2039 Characteristics of terrestrial
34、 IMT-2000 systems for frequency sharing/interference analyses. These OFDMA-TDD-WMAN parameters are given in Table 1. For OFDMA-TDD-WMAN using a 10 MHz channel bandwidth the characteristics are as shown in Table 2. Note that the ACLR and ACS values apply for a bandwidth of 5 MHz rather than 10 MHz, a
35、nd that all other parameters are identical to the 5 MHz scenario. Figure 1 shows the spectral layout of the channels when the OFDMA-TDD-WMAN transmission occurs adjacent to the CDMA-DS base station transmission without a guardband, whilst Fig. 2 shows the layout when there is a 5 MHz guardband. Note
36、 that the ACLRs given in Table 2 represent the value measured in a 5 MHz CDMA-DS channel relative to the full 10 MHz wanted signal power, and the ACSs given in the table refer to the selectivity of the 10 MHz OFDMA-TDD-WMAN receiver filter in discriminating against a 5 MHz transmission. In this Repo
37、rt, the term “first adjacent channel” implies no guardband, while the term “second adjacent channel” implies a 5 MHz guardband, irrespective of the OFDMA-TDD-WMAN channel bandwidth. 23GPP March 2005 Radio frequency (RF) system scenarios. 3GPP TR 25.942 Version 6.4.0. 3IEEE 2004 IEEE 802.16. IEEE sta
38、ndard for local and metropolitan area networks Part 16: Air interface for fixed broadband wireless access systems. 4IEEE February 2005 IEEE 802.16. IEEE standard for local and metropolitan area networks Part 16: Amendments for physical and medium access control layers for combined and mobile operati
39、ons in licensed bands. IEEE 802.16e-2005. Approved in December 2005 and published in February 2006. 4 Rep. ITU-R M.2146 TABLE 1 5 MHz OFDMA-TDD-WMAN parameters* (extracted from Report ITU-R M.2039) Base station Mobile station Max transmit power 36 dBm 20 dBm Antenna gain 18 dBi 0 dBi Antenna height
40、30 m 1.5 m ACLR 5 MHz 53.5 dB 33 dB ACLR 10 MHz 66 dB 43 dB ACS 5 MHz 46 dB 33 dB ACS 10 MHz 56 dB 47 dB Noise figure 3 dB 5 dB Downlink/uplink ratio 2:1 * These ACLR values can also be found in Recommendations ITU-R M.1580 Generic unwanted emission characteristics of base stations using the terrest
41、rial radio interfaces of IMT-2000, and ITU-R M.1581 Generic unwanted emission characteristics of mobile stations using the terrestrial radio interfaces of IMT-2000, and these ACS numbers as well as the other parameter values are also found in Report ITU-R M.2039. TABLE 2 10 MHz OFDMA-TDD-WMAN parame
42、ters Base station Mobile station Max transmit power 36 dBm 20 dBm Antenna gain 18 dBi 0 dBi Antenna height 30 m 1.5 m ACLR(5 MHz) 7.5 MHz 53.7 dB 33.4 dB ACLR(5 MHz) 12.5 MHz 66.2 dB 43.4 dB ACS(5 MHz) 7.5 MHz 46 dB 33 dB ACS(5 MHz) 12.5 MHz 56 dB 47 dB Noise figure 3 dB 5 dB Downlink/uplink ratio 2
43、:1 FIGURE 1 10 MHz OFDMA-TDD-WMAN adjacent to 5 MHz CDMA-DS without a guardband (termed the “first adjacent channel” in this study) Report 2146-01OFDMA-TDD-WMAN10 MHzCDMA-DS7.5 MHzRep. ITU-R M.2146 5 FIGURE 2 10 MHz OFDMA-TDD-WMAN adjacent to 5 MHz CDMA-DS with a 5 MHz guardband (termed the “second
44、adjacent channel” in this study) Report 2146-02OFDMA-TDD-WMAN10 MHzCDMA-DS12.5 MHz5 MHzguardchannel4.2 CDMA-DS When performing sharing studies between IMT-2000 and other technologies, appropriate parameters for the IMT-2000 technologies are given in Report ITU-R M.2039. The parameters of CDMA-DS use
45、d in the analyses are given in Table 3. As for the OFDMA-TDD-WMAN ACLR and ACS parameter values, refer to 3.3.1 for further information about the CDMA-DS ACLR and ACS values presented in Table 3. TABLE 3 CDMA-DS parameters for use in the 5 MHz study (extracted from Report ITU-R M.2039) Macrocell bas
46、e station Microcell base station Picocell base station Mobile station Max transmit power 43 dBm 38 dBm 24 dBm 21 dBm Antenna gain 17 dBi 5 dBi 0 dBi 0 dBi Antenna height 30 m 6 m 1.5 m 1.5 m ACLR 5 MHz 45 dB 33 dB ACLR 10 MHz 50 dB 43 dB ACS 5 MHz 46 dB 33 dB ACS 5 MHz 58 dB 43 dB Noise figure 5 dB
47、9 dB Required Eb/N06.1 dB for voice 7.9 dB for voice Power control range 30 dB (1 dB per step) 71 dB (1 dB per step) Although the CDMA-DS system is identical in both the 5 MHz and 10 MHz studies, the ACLR and ACS parameters are different to those given in Report ITU-R M.2039 as different bandwidths
48、and frequency offsets need to be taken into account. Based on the spectrum mask for CDMA-DS5,6, shown in Fig. 3, ACLR values for a 10 MHz adjacent channel have been derived by using the equation defined in Recommendation ITU-R SM.1541-1 Unwanted emissions in the out-of-band domain. Note that this me
49、thod produces a lower bound for the ACLR. For the first adjacent channel, the ACLR value is calculated by integrating interference power in the 9 MHz receiver 5Recommendation ITU-R M.1580-2. 6Recommendation ITU-R M.1581-2. 6 Rep. ITU-R M.2146 bandwidth, thus ACLR value at 7.5 MHz frequency offset is defined. For the second adjacent channel, the ACLR value is calculated by integrating the interference power in the 9 MHz receiver bandwidth of the signal centred in the 10 MHz channel separated by 5 MHz, thus the ACLR value at 12.5 MH
