Since the user network group membership information didn't change between the logins, the server pulls in the same PAC structure as in Session 1.
由于该用户的网络组成员关系在这两次登录之间并没有发生改变，因此服务器所获取的PAC结构就与会话1中的完全相同。
The number of base stations in multicast group for control was adjusted according to structure of the mobile network and the moving velocity of mobile hosts.
每个控制组播组包含的基站数量根据网络结构和主机的移动速度来调整。
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