The system performance is examined according to various average SNRs--it is assumed that the average SNR of the BS-RS
link, [[bar.[gamma].sub.br], is 30 dB, the average SNRs of the BS- MS link, [[bar.[gamma].sub.ym], are 0 and 10 dB, and the average SNRs of the RS-MS link, [[bar.[gamma].sub.rm], are 10, 20, and 30 dB.
thus, the bandwidths of BS-RS and RS broadcast link can be obtained as
where [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] denote the bandwidths of MT-RS, RS-BS, BS-RS and RS-MT link respectively.
where [t.sub.(ul)] and [w.sup.(dl)] denote the effective throughput of uplink and downlink, [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] indicate the throughput of MT-RS, RS-BS, BS-RS and RS-MT link, respectively.
where [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] denote the PSDs of average MAI appearing over BS-RS, RS-MT and RS-BS link respectively.
So, it is necessary to analyze the influence of the transmission power of the vehicle-mounted relay on interference in the BS-RS and RS-MS links and the service quality of the user inside the car.
If the BS-RS link status is poor, then a bottleneck phenomenon may occur, even though the RS-MS link status is very good.
As RS density increases, RS-MS link quality becomes worse due to inter-RS interference where there is no effect on BS-RS link.
As defined in subsection 2.2, the BR zone ratio means the ratio of the amount of resources allocated to BS-RS link to total resources.