The strategy is as risky as a relay handoff .

该策略就像接力赛中的接棒环节一样存在风险。

Voice links were poor , handoff unreliable , capacity low , and security non-existent .

语音连绵很差、越区切换不真实、容量小且不齐备安闲。

Reducing the cell size though can promote the utilization of resources , increases the handoff frequency in the meantime .

缩小蜂巢虽然可以提升资源的使用效能，却造成了换手频率的增加。

Frequent handoff requests may give a serious impact on quality of service .

频繁之交递请求可能对於服务品质造成重大影响。

A handoff of the aircraft from one control tower to another .

把飞机由一架控制塔转交给另一架控制塔。