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How to calculate the bandwidth convergence ratio

Publication Date:  2012-07-25 Views:  72 Downloads:  0
Issue Description
Requirements of the scenario:
(1) The convergence layer or core layer may suffer insufficient bandwidth.
(2) The bandwidth utilization of statistical multiplexing at the convergence layer or core layer needs to be improved. Customers expect bandwidth convergence, or overbooking.
But how to calculate the bandwidth convergence ratio?



Alarm Information
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Handling Process
It is recommended that HSPA non-real time services be configured with BE forwarding priority. These services have a high requirement for bandwidth and a low requirement for QoS. Therefore, the services can adopt statistical multiplexing and allow a higher convergence ratio.
The bandwidth convergence is performed in the case of eight or more NodeBs.
The converged bandwidths must be higher than the maximum bandwidth of a NodeB.
The more the NodeBs, the higher the convergence ratio; the less the NodeBs, the smaller the convergence ratio.
The NMS monitors the traffic on the UNI side and NNI side to dynamically track the convergence ratio and operation status of the network.
In the case of bandwidth convergence, define the priorities of the incoming services. Then, the services with a lower priority are discarded to guarantee the transmission of the services with a higher priority if necessary.
The customer/wireless department needs to define the actual convergence ratio. If the customer/wireless department does not require bandwidth convergence, no convergence ratio is defined. If the customer requires bandwidth convergence and requests Huawei to define the convergence ratio. define the convergence ratio as follow:
If the average throughput of each base station is 20 Mbit/s, the peak throughput is 50 Mbit/s. If a hub site converges services from N sites (including the local site), the number of sites from which a 158 Mbit/s link can receive services is as follows:

One hub site can converge services from four sites (including the local site), the peak bandwidth after convergence is as follows:

If the convergence is not required, the required bandwidth is maximum bandwidth of the base station multiplied by the number of base station, that is, 4 x 50 = 200 Mbit/s. Overbooking/Convergence ratio = 200/140 x 100% = 1.42.



Root Cause
For Microwave network, the convergence layer or core layer may suffer insufficient bandwidth, or the bandwidth utilization of statistical multiplexing at the convergence layer or core layer needs to be improved. So we expect bandwidth convergence, or overbooking.



Suggestions
According to the real situation and customer requirement, and through the convergence ratio to make a planning for the network.


END