漫游场景下HeNB和WLAN间的跨层无缝切换方案

家庭基站是一种小型低功率蜂窝基站，用于室内场所的无线接入．它和无线局域网技术都具有相同的无线接入功能，在并存的情况下不可避免地会发生切换．为了对这两种技术进行更好的融合，在漫游场景下，提出一种无线局域网和家庭基站间的跨层无缝切换方案．该方案使用预认证的方法，并对已有的预注册方案进行改进，使得切换过程拥有较低的时延，同时使用包存储转发功能保证了低丢包率．给出了具体的信令流程．最后，对本方案和其他方案在通信开销，切换时延以及丢包率等方面进行了详细的比较分析．分析结果表明，本方案的通信开销、切换时延和丢包率都小于现有的两种主流方案．

Scheme for cross-layer seamless handover between HeNB and WLAN in the roaming scenario

Home eNodeB(HeNB) is a small,low-power cellular base station,mainly used for indoor wireless access.During the period of coexistence of WLAN and HeNB,inevitable handover will occur between them in a certain region.To integrate these two technologies better,we propose a scheme for cross-layer seamless handover between HeNB and WLAN in the roaming scenario.The proposed scheme uses the basic idea of pre-registration and performs the pre-authentication process before layer 2 handover to reduce handover delay.In addition,it uses packet buffering and forwarding functions in order to reduce packet loss during the handover period.Detailed signaling procedures are presented.Finally,a detailed comparison is made in the signaling cost,the handover latency and the packet loss.The results of analysis illustrate that the proposed scheme achieves better performance compared to several other schemes.