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In general, the QoS level of one physical channel can be controlled by changing the target SIR in fast TPC employing outer loop control so that the output BLER or BER is equal to the required value as explained later. 5 Operation principle of rate matching. QOS: quality of service. 14 Advances in 3G Enhanced Technologies for Wireless Communications power, is an almost constant value during one radio frame interval. Therefore, to bundle various transport channels with different QoSs into one physical channel, the required QoSs of various transport channels are simultaneously satisfied with respect to the identical average received signal power by changing the number of coded bits of each transport channel after channel decoding (this process is called rate matching ).
The corresponding physical channel is PRACH. The slotted ALOHA protocol is used for PRACH transmission to avoid collision of simultaneously transmitted PRACHs with an identical spreading code sequence. 13. As shown in the figure, MS starts a PRACH transmission at the beginning of one of the 15 predefined time slots, called access slots, during a two radio-frame interval. The forward link AICH is divided into forward link access slots, and the reverse link PRACH is divided into reverse link access slots.
The P REF is constant during the length of the G slot (k ) and its value of n (= g × G )th slot P REF (n ) is updated every G (k ) (k ) slot as P REF (g × G ) = P REF (( g − 1) × G ) + ⌬P (k ). (k ) 2. 22 Combination of forward link site diversity and TPC. 23 as a function of the total BS average transmit power. 21. Fast TPC was used for the reverse and forward links. The number of maximum RAKE fingers for the BS and MS was 4. 8. In the course of making our measurements, we observed that the instantaneous transmit power is controlled around the standard transmit power without dispersing to the maximum output during the measuring process.