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第三代移动通信技术支持分层小区结构(HCS),宽带CDMA的载波可引进一种被称为“移动辅助异频越区切换(MAIFHO)”的新切换机制,使其能够支持分层小区结构。这样,移动台可以扫描多个码分多址载波,使得移动系统可在热点地区部署微小区。在蜂窝移动通信网中,切换是保证移动用户在移动状态下实现不间断通信越区切换;切换也是为了在移动台与网络之间保持一个可以接受的通信质量,防止通信中断,这是适应移动衰落信道特性的必不可少的措施。特别是由网络发起的切换,其目的是为了平衡服务区内各小区的业务量,降低高用户小区的呼损率的有力措施。切换可以优化无线资源(频率、时隙、码)的使用;还可以及时减小移动台的功率消耗和对全局的干扰电平的限制。
The third generation of mobile communication technology supports a hierarchical cell structure (HCS) and a carrier of wideband CDMA may introduce a new handoff mechanism called “Mobile Assisted Hetero-Interleaved Handoff (MAIFHO)” that enables it to support Layer community structure. In this way, the mobile station can scan multiple code division multiple access carriers so that the mobile system can deploy micro-cells in hot spots. In the cellular mobile communication network, the handover is to ensure that the mobile users to achieve continuous communication in the mobile state handover; the handover is also in order to maintain an acceptable communication quality between the mobile station and the network, to prevent communication interruption, which is adapted to move Fading channel characteristics of the necessary measures. In particular, the switching initiated by the network aims to balance the traffic volume of all the cells in the service area and reduce the call loss rate in high-user cells. Switching can optimize the use of radio resources (frequency, time slot, code); also can reduce the mobile station’s power consumption and the global interference level limit in time.