Patent ID: 9736125
Date: 2017-08-15
CPC Classifications: H04L,H04W

Claim:
1. A method for generating an access stratum key in a communications system, wherein a first network-side device connects to a user equipment (UE) through a first air interface and accesses a core network (CN), and the first network-side device connects to a second network-side device, wherein the second network-side device connects to the UE through a second air interface, and the method comprises: acquiring, by the first network-side device, a random number generated by the first network-side device, wherein the random number generated by the first network-side device is a value of a counter which changes each time it is used; sending, by the first network-side device, a configuration message used for configuring the second air interface to the UE, wherein the configuration message carries the random number generated by the first network-side device; calculating, by the first network-side device, an access stratum root key KeNB* for the second air interface according to the value of the counter and an access stratum root key KeNB on the first air interface, wherein the second air interface is between the second network-side device and the UE; and sending, by the first network-side device, the KeNB* to the second network-side device for generating a same access stratum key on the second air interface as the UE.