Overlay of TDMA and multiclass CDMA systems with slots reallocation on the TDMA layer

This paper extends and complements a previous research where we show that the overlay of multicast CDMA and TDMA systems is possible with the assumption of an ordered hunt. In this work, we present a new scheme of overlay situation in which the cochannel TDMA slots are placed at the end of the list but with the additional assumption of a slots reallocation (reallocation control model), in order to reduce the TDMA interference to CDMA layer and increase the overlay capacity. It means that if one slot is set free among the first m ordered busy slots, the user who occupies the m-th slot (last position) will be reallocated to the released position. Comparing with the pure ordered hunt scheme we have obtained an important improvement on the capacity due to the reallocation strategy, associated to a better performance on the TDMA system in terms of the outage probability.