HLR/EPCHSS和IMSHSS独立部署时VoLTE业务开展的方法

Method on VoLTE Services Development with HLR/EPC HSS and IMS HSS Separated Deployment

3GPP在规范增强SRVCC、业务终呼域选择SDS、终呼接入域选择(T-ADS)等VoLTE相关解决方案时,都是将IMS HSS、HLR/EPC HSS作为统一的广义HSS来描述流程的,该广义HSS具备所有域的归属服务器功能。而在运营商实际部署中,HLR/EPC HSS和IMS HSS往往是分开的,此时若没有HLR/EPC HSS和IMS HSS之间的交互,这几种业务是无法开展的。针对这种场景,给出了增强SRVCC、SDS、T-ADS流程中HLR/EPC HSS和IMS HSS之间交互的方法,使得上述VoLTE相关业务可以开展。

3GPP makes IMS ttSS, tfLR/EPC HSS as a unified HSS to describe the procedure when it solves some VoLTE relative services such as specification enhancement SRVCC, tenninating service domain selection SDS, terminating access domain selection（T-ADS）, etc. This generalized HSS has home server functions for all the domains. However, HLR/EPC HSS and IMS ttSS are always deployed separately in the operators＇ mobile networks, which makes these services unable to carry- out if there is no interaction between HLR/EPC HSS and IMS HSS. Based on this problem, in the process of enhanced SRVCC, SDS and T-ADS, the method on the interaction between HLR2 EPC HSS and IMS HSS is proposed to make the VoLTE relative sen＇ices carry out.