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WiMAX Security and Quality of Service (eBook, ePUB)
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We make use of MIH function and services to generate the necessary triggers and events in our architecture. Handover policy engine in the MS depicting the different variables in the RMPA algorithm and their cross-layer interaction. It is not fired merely as a result of signal power degradation, information on distance to target BS is also relevant. Rule 3 in this section specifies when LGD trigger is fired. The following variables from the different layers and represented in Figure 6 take part in the handover policy:. Mobile node type of train. Each specific type of train has a predefined train program, that is, source and destination, and route to be followed.
As such, the sequence of expected BSs along the full trajectory of the MS is known. Historical information regarding previously undertaken routes for this specific type of train. This information may be obtained from the non-volatile memory unless it is the first train for this train program. MS current location and speed.
Data traffic QoS specific requirements for the specific profile supported by the MS. This information is obtained from the MAC layer configuration. These measurements are normally elicited from the downlink preambles, which occur once per frame. Some considerations are necessary.
The train type defines the source and destination and consequently the route of the train and the sequence of BSs in that route. By checking the MS type of train and its current location, the next expected target BS id can be determined. Figure 6 shows the different variables involved in the RMPA handover algorithm and their emplacement in different layers. The scanning process should take place immediately before the handover process.
The handover process then benefits from considering valid target BS information obtained from the last MAC synchronization of the MS with the target BS in the preceding scanning process. Figure 7 represents the downlink SNR received by the train from the serving and target BS across the train route.
It can be observed the message exchanged and the triggers involved.
Mobile WiMAX Resource Allocation Design Goals: Key Features/Factors/Issues
As shown in Figure 7 , the following relationship is defined between the two link triggers that govern the scheduling of the RMPA handover scheme:. To minimize general packet loss during the handover process, and in particular, handover signaling packet loss, the RMPA handover policy should search for the highest power signal received from each BS. As shown in Figure 7 , the maximum theoretical power signal area is obtained if the LGD trigger is scheduled so that the channel switch occurs at the midpoint.
This strategy for promoting the channel switch at the midpoint provides a balance between two commonly used handover metrics: successful handover rate and average number of handovers. Location discovery techniques have evolved significantly over the last few years and particularly in the railway domain.
The latter condition ensures that the target BS is ready. Otherwise, the handover initiation should not go ahead. From the RMPA procedure described previously, it should be understood that when determining the consecutive decision-making stages for SCI and LGD trigger generation, there is enough information to allow the MS to calculate the expected handover signaling latency. Here, 20 ms corresponds to the minimum jitter from the most demanding application in the railway context.