a) Microwave Link connects two cellular network sites.
b) It carries two types of traffic: Voice and Data.
C) Commonly each BTS site has one E1 (2 Mbps) of transmission capacity.
d) PDH or SDH are the two standards for traffic capacity over Microwave Link in terms of E1. 2 x 2 (2E1), 4 x 2 (4E1), 8 x 2 (8E1), 16x 2 (16E1), STM1 etc.
E) PDH Transmission rates
E1-2 Mbps
E2-8 Mbps
E3-34 Mbps
E4-140 Mbps
E5-565 Mbps
f) SDH Transmission rates
STM-1-155.52 Mbps
STM-4-622.08 Mbps
STM-16-2488.32 Mbps
STM-64-9953.28 Mbps
E1-2 Mbps
E2-8 Mbps
E3-34 Mbps
E4-140 Mbps
E5-565 Mbps
f) SDH Transmission rates
STM-1-155.52 Mbps
STM-4-622.08 Mbps
STM-16-2488.32 Mbps
STM-64-9953.28 Mbps
Figure : Microwave Link Traffic
PCM Planning;
1) PCM planning is basically Capacity, Equipment & Network Topology planning.
2) Information required for PCM planning
a) Permit blocking possibility at various interfaces
b) Location of the equipment in the site and their configurations.
c) Current traffic load in the site.
d) About the LOS between the sites.
3) Capacity of a microwave link depends on the number of E1 (2Mbps) data carried from one site to another.
1) PCM planning is basically Capacity, Equipment & Network Topology planning.
2) Information required for PCM planning
a) Permit blocking possibility at various interfaces
b) Location of the equipment in the site and their configurations.
c) Current traffic load in the site.
d) About the LOS between the sites.
3) Capacity of a microwave link depends on the number of E1 (2Mbps) data carried from one site to another.
Topology Planning;
For cities < 4 sites
all hops shall be in a star topology employing 16×2 radios in 1+0 configuration.
For cities < 4 sites
all hops shall be in a star topology employing 16×2 radios in 1+0 configuration.
Figure : Topology Planning
For cities >5 & <8 br="br" sites="sites">All hops shall be in a star topology employing 16×2 radios in 1+0 configuration.
Figure : Topology Planning
For cities >9 till 14 sites
PDH rings are considered for cities > 9 till 14 sites.
PDH rings are considered for cities > 9 till 14 sites.
Figure : Topology Planning
For cities >15 till 28 sites
SDH rings are considered for cities > 15 to 28 sites.
SDH rings are considered for cities > 15 to 28 sites.
Figure : Topology Planning
For cities > 29 to 6 sites
SDH rings are considered for cities > 29to 56 sites.
SDH rings are considered for cities > 29to 56 sites.
Figure : Topology Planning
For cities > 57Â to 110 sites
Figure : Topology Planning
BoM
1) Inputs for Transmission Planning;
Count of new town and existing towns sites and the subscribers in each site.
From the above data, the number of BSCs required is to be calculated.
The final capacity for each route or link
2)Nominal Transmission Plan
Based on the above inputs, the planner should prepare the nominal connectivity plan by plotting all the new sites on the tool and BSCs can be fixed.
After nominal connectivity plan it is known how many 7GHz/15GHz/18GHz/23GHz links are required.
Based on the above the MW requirement can be given as BoM
1) Inputs for Transmission Planning;
Count of new town and existing towns sites and the subscribers in each site.
From the above data, the number of BSCs required is to be calculated.
The final capacity for each route or link
2)Nominal Transmission Plan
Based on the above inputs, the planner should prepare the nominal connectivity plan by plotting all the new sites on the tool and BSCs can be fixed.
After nominal connectivity plan it is known how many 7GHz/15GHz/18GHz/23GHz links are required.
Based on the above the MW requirement can be given as BoM
Equipment Requirement;
1) Indoor/Outdoor Unit Estimation
Generally one BTS gives one E1.
The microwave hop would be about 20% over the number of BTS, for upgrade, last mile connectivity.
IDU should be 30% more than no. of MW hops.
2) Metro hub Estimation
Each Metro hub can cater for one 16E1 loop.
For dimensioning assume 6 – 8 BTS per Metro hub as some BTS may have more than 1E1. The Metro hub is configured with 1 FIU and 3 RRI cards.
In case of a mixed Microwave network and if the ring origination/termination hops at the BSC/hub site are non-Nokia, then the Metro hub configuration would be 3 FIU + 3 RRI.
3)Â Each hop requires one or more antennas (with cable and accessories) as per diversity/protection configuration.
1) Indoor/Outdoor Unit Estimation
Generally one BTS gives one E1.
The microwave hop would be about 20% over the number of BTS, for upgrade, last mile connectivity.
IDU should be 30% more than no. of MW hops.
2) Metro hub Estimation
Each Metro hub can cater for one 16E1 loop.
For dimensioning assume 6 – 8 BTS per Metro hub as some BTS may have more than 1E1. The Metro hub is configured with 1 FIU and 3 RRI cards.
In case of a mixed Microwave network and if the ring origination/termination hops at the BSC/hub site are non-Nokia, then the Metro hub configuration would be 3 FIU + 3 RRI.
3)Â Each hop requires one or more antennas (with cable and accessories) as per diversity/protection configuration.
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