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TD-SCDMA系统中,为了满足直放站的覆盖范围,避免直放站对系统的干扰,甚至引起切换失败,信号的总传输时延必须满足一定的要求。根据直放站的实际应用形式,提出了计算TD-SCDMA直放站传输时延的系统模型,计算了光纤、电缆和空气介质的传输时延。根据TD-SCDMA系统上行同步检测对最大时延的要求和联合信道检测技术对时延差的要求,给出了施主链路、分配链路的最大距离计算公式。
In TD-SCDMA system, in order to meet the coverage of the repeater and avoid interference of the repeater to the system, or even cause the handover failure, the total transmission delay of the signal must meet certain requirements. According to the practical application form of repeater, a system model for calculating TD-SCDMA repeater transmission delay is proposed, and the propagation delay of optical fiber, cable and air medium is calculated. According to the requirement of TD-SCDMA uplink synchronization detection to the maximum delay and the joint channel detection technology to the TDE, the formula for calculating the maximum distance between donor link and distribution link is given.