#Rrm rational requirements manager how to#

It is hence possible to categorize VHs based on the motivator. In fact, if the operator can recognize an overload instance in a certain network, users can be migrated from the overloaded network to other networks. However, if the operator can recognize users that can be migrated to other networks with the objective of “making room” for the user’s request, the call would be accepted. Under normal circumstances, the operator would not be able to accommodate the user, and the request would be denied. 2 where a user with a single mode terminal attempts to access an operator’s network that is currently loaded. Consider, for example, the scenario shown in Fig. However, while VHs motivated by user preferences bear their own challenges, the general notion of VH can be exploited by the operator.

#Rrm rational requirements manager how to#

preferences, and how to reach points of compromise also comes into light. The pressing question of defining a network policy and accommodating a user policy, viz.

The disparity of the different networks overseen by a single operator poses several challenges. Designing RRM frameworks for HWNs will ultimately call for non-traditional modeling methods that include previously not-accounted-for characteristics. User requirements and preference will be dependent on user’s position and mobility, in addition to the capabilities and attributes of the networks traversed by the user during an active session. The introduction of VHs, therefore, bears certain challenges to the designer of an HWN – especially from a radio resource management (RRM) perspective. For example, a terminal changing association between two 802.16 base stations (BS) or two 802.11 access points (AP) is said to undergo a horizontal handoff, while one changing association between a BS and an AP, or vice versa, is said to undergo a vertical handoff. The term “vertical” counters the term “horizontal handoff” which characterizes a handoff taking place in networks with homogeneous access. This capability is called inter-technology handoff or vertical handoff (VH). However, without maintaining the session through mobility or varying network conditions, a session must be terminated and re-initiated if the user is interested in continuing the session through a different interface. With such a capability, terminals can initiate connectivity through the technology that most closely matches the user’s or the application’s requirements.

terminals with more than one radio interface and each enabling them to access a different access technology. For users, HWNs present a further degree-of-freedom in selecting the access technology that is most appropriate for the user’s terminal capabilities and application requirements – even connect simultaneously to more than one access technology.Įlementary to the operation of HWNs is the existence of multi-mode terminals, i.e. The operator’s HWN would exploit the better characteristics of the different access technologies in terms of coverage, efficiency, or profitability.

For a network operator, the objective of creating such a “composition” is to realize a network that is more capable in delivering the service between the service provider and the wireless end user. An example of a wireless overlay is shown in Fig. coverage overlaps, of different technologies. HWNs are also called wireless overlay networks (WONs) since their coverage comprises wireless overlays, i.e. A heterogeneous wireless network (HWN) is a composite made of two or more wireless access technologies, each with its own characteristics in terms of coverage, QoS assurance, implementation and operation costs, etc.