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The basic plan of the network engineers was to re-use most GSM sites for the UMTS network, due to the following reasons: 1 Ease and speed of implementation; 2 Simpler maintenance and a lower cost of operations (OPEX); 3 Matching the demographic traffic requirements However, as mentioned above, the usage of a higher frequency band, together with the inherited differences between FDMA and CDMA technologies, makes this a very challenging task To better understand the embedded differences, let us recapture some of the key methods used for GSM planning Frequency assignment Each GSM cell is assigned frequencies not repeated in adjacent cells (for simplicity, the case of 1:1 synthesised frequency hopping is ignored here, it will be referred to later).

When tasked with evaluating an incident response process, you would be well served to look up the latest best practices seen as expert advice in the information security space at the time of the review This process is maturing rapidly and new threats have expanded the need for forensics and ongoing monitoring a great deal since online access in all its permutations have developed over the last few years New technologies such as wireless networks bring drive-by network attacks into the realm of reality, which was an unthinkable situation only a few years back Some of the expected procedures do not really change, however, and the basic infrastructure will adapt to the current need if it is well established and supported This process starts at the top of the organization.

The frequency assignment is done according to the following criteria: Number of frequencies is equal (or larger) than the number of transmitters (TXs) to satisfy the traffic demand; The C/I, as received by the Mobile Stations in the cell s service area and by the base station in the uplink, is above a pre-determined threshold, for example 9 dB Satisfying these conditions enable a high service quality Failing to meet either of them impairs either traffic handling or call quality As most of the cellular networks are quite heterogonous in terms of demography (as reflected by the traffic distribution), topography and cells effective coverage area, there is a large variance in the number of assigned frequencies and the cells which may be either interfering or interfered to For example, it is quite common to find some high sites, especially in hilly areas that are required to cover large areas.

Let the generic transmitted and received UWB signals s(c) (t) and r(c) (t) by user c in a single-path, single-user environment be written as r Es (c) (c) ( dj bb j=Ns c vtrj) t jTf c(c) Th da(c) s c , s (t) j b j=N Ns j 1 1 r X Es (c) (c) (c) ( r (t) dj bb j=Ns c vtrj) t jTf c(c) Th da(c) s c e j n(t), j b j=N Ns j 1

It can be done by assigning them frequencies that are not repeated over a larger area As long as there are enough frequencies to support both these boomer sites and regular sites it is a feasible and commonly used solution However, when it comes to CDMA-based technologies, the reuse of the same frequency makes it impossible, as these high sites create high interference all around them, impairing both coverage and capacity of the other regular sites Hence, the planning engineer must avoid using these sites, or alternatively severely limit their propagation area This usually means adding more sites to the network to compensate for the loss of coverage It is not rare to find that the removal of one boomer site necessitates adding three or more additional sites Another aspect related to boomer sites is their traffic handling.

Senior management must support the activity and provide for the education and training necessary to react quickly in times of need To adequately determine if the processes in place will meet those needs, you must understand the management requirements from an incident response process by asking some probing questions related to management s expectations Being prepared to perform a forensic post mortem analysis is a lot different from a support and readiness requirements perspective than pulling the plug on an attack in progress or enabling the businesses to continue operations while minimizing the an attack s effect in real time Remember the response to incidents is after or during the fact it is not preventative The house is already on fire or burned badly by the time this process kicks in.