1、 Rec. ITU-R F.1565 1 RECOMMENDATION ITU-R F.1565*Performance degradation due to interference from other services sharing the same frequency bands on a co-primary basis with real digital fixed wireless systems used in the international and national portions of a 27 500 km hypothetical reference path
2、at or above the primary rate (Question ITU-R 127/9) (2002) The ITU-R Radiocommunication Assembly, considering a) that Recommendation ITU-R F.1397, based on ITU-T Recommendations G.826 and G.828, specifies error performance objectives for real digital fixed wireless systems (FWS) links in the interna
3、tional portion of an hypothetical reference path (HRP); b) that Recommendation ITU-R F.1491, based on ITU-T Recommendations G.826 and G.828, specifies error performance objectives for real digital FWS links in the national portion of an HRP; c) that Recommendation ITU-R F.1241 specifies allowable ag
4、gregate performance degradation due to interference from other services sharing the same bands on a primary basis with digital FWS in the international portion of an HRP; d) that Recommendation ITU-R F.1398 specifies performance degradation due to interference from other services sharing the same fr
5、equency bands on a primary basis with digital FWS operating at or above the primary rate and which may form part of the national portion of an HRP; e) that there is a need to establish, based on Recommendations ITU-R F.1397 and ITU-R F.1491, the allowable aggregate performance degradation due to int
6、erference from other co-primary services sharing the same bands with real FWS links in the international and national portions of an HRP, recommends 1 that, in each direction of any real digital FWS link of length Llink, in the international portion of an HRP at or above the primary rate, the allowa
7、ble degradation in performance resulting from the aggregate of the emissions from systems of other services should not exceed the limits given by means of equation (1) in any month, using the values in Tables 1a and 1b for synchronous digital hierarchy (SDH) systems designed according to ITU-T Recom
8、mendation G.828 and values in Tables 2a and 2b for other systems designed according to ITU-T Recommendation G.826 (see Notes 1, 2, 3, 4, 10 and 11); _ *As a consequence of the approval of this Recommendation, Recommendations ITU-R F.1241 and ITU-R F.1398 could be deleted. 2 Rec. ITU-R F.1565 Degrada
9、tion in EPO due to interference = Bj (Llink/LR) + Cj(1) where: j = 1 for Lmin Llink 1 000 km (intermediate country) j = 2 for 1 000 km 5-15 2.5 104(1 + BR) 0 2.5 1041 104 BRESR 15-55 3.75 104(1 + BR) 0 3.75 1041.5 104 BRESR 55-160 8 104(1 + BR) 0 8 1043.2 104 BRESR 160-3 500 Under study Under study
10、Under study Under study SESR 1.5-3 500 1 105(1 + BR) 0 1 1054 106 BRBBER (see Note 6) 1.5-3 500 1 106(1 + BR) 0 1 1064 107 BRLmin Llink 500 km 500 km 5-15 2.5 104(1 + BR) 0 2.5 1045 105 BRESR 15-55 3.75 104(1 + BR) 0 3.75 1047.5 105 BRESR 55-160 8 104(1 + BR) 0 8 1041.6 104 BRESR 160-3 500 Under stu
11、dy Under study Under study Under study SESR 1.5-3 500 1 105(1 + BR) 0 1 1052 106 BRBBER (see Note 6) 1.5-3 500 1 106(1 + BR) 0 1 1062 107 BR4 Rec. ITU-R F.1565 TABLE 3a Objectives for degradation of performance due to interference for real SDH FWS links belonging to the long-haul inter-exchange netw
12、ork section of the national portion of the HRP according to ITU-T Recommendation G.828 TABLE 3b Objectives for degradation of performance due to interference for real FWS links belonging to the long-haul inter-exchange network section of the national portion of the HRP at or above the primary rate a
13、ccording to ITU-T Recommendation G.826 where: A = (A1+ 0.002) Llink/100 for 50 km Llink 100 km A = A1+ 2 105Llinkfor 100 km 5 to 15 15 to 55 55 to 160 160 to 3 500 ESR 0.004 A 0.005 A 0.0075 A 0.016 A For further study SESR 0.0002 A 0.0002 A 0.0002 A 0.0002 A 0.0002 A BBER 2 A 105(see Note 5) 2 A 10
14、52 A 1052 A 1051 A 105Rec. ITU-R F.1565 5 TABLE 4a Objectives for degradation of performance due to interference for real SDH FWS links forming all of the short-haul inter-exchange network section of the national portion of the HRP according to ITU-T Recommendation G.828 TABLE 4b Objectives for degr
15、adation of performance due to interference for real FWS links forming all of the short-haul inter-exchange network section of the national portion of the HRP at or above the primary rate according to ITU-T Recommendation G.826 The value of B has provisionally been agreed to be in the range of 0.075
16、to 0.085 (7.5% to 8.5%) (see Notes 7, 8 and 9); 4 that, in each direction of any real digital FWS link of length Llinkforming all of the access network section of the national portion of HRP, the allowable degradation in performance resulting from the aggregate of the emissions from systems of other
17、 services should not exceed in any month, the provisional limits given in Table 5a for SDH systems designed according to ITU-T Recommen-dation G.828 and in Table 5b for other systems designed according to ITU-T Recommen-dation G.826 (see Notes 1, 2, 3, 4, 10 and 11). TABLE 5a Objectives for degradat
18、ion of performance due to interference for real SDH FWS links forming all of the access network section of the national portion of the HRP according to ITU-T Recommendation G.828 Rate (Mbit/s) Parameter 1.664 (VC-11, TC-11) 2.240 (VC-12, TC-12) 6.848 (VC-2, TC-2) 48.960 (VC-3, TC-3)150.336 (VC-4, TC
19、-4) ESR 0.001 B 0.001 B 0.001 B 0.002 B 0.004 B SESR 0.0002 B BBER 5 106 B 1 105 B Rate (Mbit/s) Parameter 1.5 to 5 5 to 15 15 to 55 55 to 160 160 to 3 500 ESR 0.004 B 0.005 B 0.0075 B 0.016 B For further study SESR 0.0002 B 0.0002 B 0.0002 B 0.0002 B 0.0002 B BBER 2 B 105(see Note 5) 2 B 1052 B 105
20、2 B 1051 B 105Rate (Mbit/s) Parameter 1.664 (VC-11, TC-11)2.240 (VC-12, TC-12) 6.848 (VC-2, TC-2) 48.960 (VC-3, TC-3) 150.336 (VC-4, TC-4) ESR 0.001 C 0.001 C 0.001 C 0.002 C 0.004 C SESR 0.0002 C BBER 5 106 C 1 105 C 6 Rec. ITU-R F.1565 TABLE 5b Objectives for degradation of performance due to inte
21、rference for real FWS links forming all of the access network section of the national portion of the HRP at or above the primary rate according to ITU-T Recommendation G.826 The value of C has provisionally been agreed to be in the range of 0.075 to 0.085 (7.5% to 8.5%) (see Notes 7, 8 and 9); 5 tha
22、t for the error performance objectives evaluation in recommends 1 to 4, the error performance parameters for any real link are defined as follows: ESR is the ratio of errored second (ES) events to total seconds in the available time during a fixed measurement interval; SESR is the ratio of severely
23、errored second (SES) events to total seconds in the available time during a fixed measurement interval; BBER is the ratio of background block error (BBE) events to total blocks in the available time during a fixed measurement interval. The count of total blocks excludes all blocks during SESs; 6 tha
24、t Annex 1 be used as guidance in the application of this Recommendation. NOTE 1 The SES, BBE and ES events and the block structure for SDH multiplex and regenerator sections are defined in ITU-T Recommendation G.829; the SES, BBE and ES events and the block structure for paths are defined in ITU-T R
25、ecommendations G.826 and G.828. NOTE 2 A real link is defined as a portion of a path coming from partitioning and it is characterized by its real length, Llink. NOTE 3 The error performance objectives apply only when the link is considered to be available. The entry and exit criteria into and from t
26、he unavailable state are defined in ITU-T Recommen-dations G.826 and G.828. NOTE 4 According to ITU-T Recommendations G.826 and G.828 the suggested evaluation period is one month for any parameter. In FWS links these objectives should be respected for any month (see Recommendation ITU-R P.581). NOTE
27、 5 For systems installed based on designs prior to 1996, the BBER interference objective is 3 105 A (or B or C accordingly). NOTE 6 For systems with bit rates of 1.5 to 5 Mbit/s designed prior to 1996, the BBER values in Tables 2a and 2b should be multiplied by a factor of 1.5. Rate (Mbit/s) Paramet
28、er 1.5 to 5 5 to 15 15 to 55 55 to 160 160 to 3 500 ESR 0.004 C 0.005 C 0.0075 C 0.016 C For further study SESR 0.0002 C 0.0002 C 0.0002 C 0.0002 C 0.0002 C BBER 2 C 105(see Note 5) 2 C 1052 C 1052 C 1051 C 105Rec. ITU-R F.1565 7 NOTE 7 The sum of the percentages A1% + B% + C% shall not exceed 17.5%
29、, in accordance with the allocations to the national portion of an international constant bit rate path given in ITU-T Recommendations G.826 and G.828. NOTE 8 The provisional values agreed for B% + C% are in the range 15.5% to 16.5%. NOTE 9 Depending on national network configurations administration
30、s may reallocate the A%, B% and C% block allowances among the sections of the national portion of a radio path. NOTE 10 In the case of multihop links the objectives derived according to this Recommendation apply to the overall links (irrespective of the date when each hop was brought into service an
31、d of the number of independent operators involved); the allocation of the objectives to each hop is under the responsibility of the network operators. NOTE 11 The limits on allowable interference from space services apply to the aggregate effect of emissions from space stations, direct long-term emi
32、ssions from earth stations and interference due to the anomalous propagation of emissions from earth stations. ANNEX 1 Application examples This Annex shows some examples of the application of this Recommendation to real links, in order to derive the objectives. The calculations in the first two exa
33、mples are made for ESR, SESR and BBER for a link in the international portion of a HRP with length, Llink, of 105 km. Furthermore: An intermediate country is assumed. BRis assumed to be equal to 1. The evaluation time is one month (30 days). Example 1: Bit rate: 150 336 kbit/s (VC-4, TC-4), i.e. obj
34、ectives according to ITU-T Recommendation G.828. Number of blocks/s: 8 000 The objectives are calculated from equation (1) and with B1and C1from Table 1a. ESR = 2 104(1 + 1) 105/2 500 + 0 = 168 107Number of ES/month = 44 SESR = 1 105(1 + 1) 105/2 500 + 0 = 84 108Number of SES/month = 3 BBER = 5 107(
35、1 + 1) 105/2 500 + 0 = 4.2 108Number of BBE/month = 871 8 Rec. ITU-R F.1565 Example 2: Bit rate: 140 Mbit/s, i.e. objectives according to ITU-T Recommendation G.826. Number of blocks/s: 8 000 The objectives are calculated from equation (1) and with B1and C1from Table 2a. ESR = 8 104(1 + 1) 105/2 500
36、 + 0 = 672 107Number of ES/month = 175 SESR = 1 105(1 + 1) 105/2 500 + 0 = 84 108Number of SES/month = 3 BBER = 1 106(1 + 1) 105/2 500 + 0 = 8.4 108Number of BBE/month = 1 742 The calculations in the next two examples are made for ESR, SESR and BBER for links in the national portion of an HRP (objec
37、tives according to ITU-T Recommendation G.826). Example 3: The access portion of the network is 20 km long and it is formed by a single link: Link L3= 20 km Capacity: 2 Mbit/s Number of blocks/s: 2 000 In this case the objectives are length independent; if C = 0.075 is assumed (see recommends 4) we
38、have: ESR = 0.004 C = 3 104(equivalent to 778 ES/month) SESR = 0.0002 C = 1.5 105(equivalent to 39 SES/month) BBER = 2 105 C = 1.5 106(equivalent to 7 776 EB/month) EB: errored block. Example 4: The short haul portion of the network is 80 km long and it is formed by a single link: Link L4= 80 km Cap
39、acity: 34 Mbit/s Number of blocks/s: 8 000 In this case the objectives are length independent; if B = 0.075 is assumed (see recommends 3) we have: ESR = 0.0075 B = 5.625 104(equivalent to 1 458 ES/month) SESR = 0.0002 B = 1.5 105(equivalent to 39 SES/month) BBER = 2 105 B = 1.5 106(equivalent to 31
40、104 EB/month) Example 5: Real link in long-haul portion of the network, designed according to ITU-T Recommen-dation G.828: Link L5= 75 km Rec. ITU-R F.1565 9 SDH transmission rate: VC-4 (150.336 Mbit/s) Number of blocks/s: 8 000 ESR = 0.004 A = 0.004 (A1+ 0.002) 75/100 SESR = 2 104 A = 2 104 (A1+ 0.
41、002) 75/100 BBER = 1 105 A = 1 105 (A1+ 0.002) 75/100 In this case the objectives are length dependent; in Table 6 the minimum and the maximum limits (A1= 0.01 and A1= 0.02) are shown: TABLE 6 Values for the objectives A1 value ESR SESR BBER 0.01 36 106(= 94 ES/month) 18 107(= 5 SES/month) 9 108(= 1 867 EB/month) 0.02 66 106(= 171 ES/month) 33 107(= 9 SES/month) 165 108(= 3 422 EB/month) NOTE 1 Rounding to immediately superior integer has been used for fractional results.
