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【多选题】
关于位置更新的概念，下面说法正确的是（）A.
位置更新是RR层特有的程序
B.
网络层一定会参与该过程
C.
周期性位置更新对应的定时器是T3212
D.
若MS在VLR的状态未知，也会启动正常的位置更新
E.
位置更新的依据是LAI号是否发生变化
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