DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S) Hereafter, a wireless transmit/receive unit (WTRU) includes but is not limited to a user equipment, mobile station, fixed or mobile subscriber unit, pager, or any other type of device capable of operating in a wireless environment.
When referred to hereafter, a base station includes but is not limited to a Node-B, site controller, access point or any other type of interfacing device in a wireless environment.
Further, as mentioned in the Background section, it should be noted that the term "call" is used to collectively refer to voice and/or data transmission/reception.
In wireless communication systems, it is preferable to assign codes of new calls to timeslots in such a manner that the collective interference (i.
e.
the total effective interference) of the assigned codes is minimized.
The total effective interference is a function of the interference caused by each individual assigned code and the fragmentation of the assigned codes making up each call.
With respect to interference, the lower the interference of each code the lower the total effective interference.
Similarly, with respect to fragmentation, the lower the fragmentation of a group of assigned codes making up a particular call the lower the total effective interference.
That is, again with respect to fragmentation, there is more interference generated where assigned codes making up a particular call are distributed over, for example, two timeslots as opposed to one.
The total effective interference is given by ##EQU1## where l(k) is the interference of code k, SF(k) is the spreading factor of code k, and j is the number of time slots used for the new call.
As explained above, the total effective interference is based on the interference of each assigned code in a frame and the manner in which those codes are distributed across the timeslots making up that frame.
When a new call is initiated therefore, the present invention generates a plurality of timeslot sequences, hypothetically assigns the codes of the new call to the timeslot sequences to measure the total effective interference for each timeslot sequence, and actually assigns the codes to the timeslot sequence yielding the lowest total effective interference
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