Patent ID: 9578067
Date: 2017-02-21
CPC Classifications: H04L,H04M,H04W

Claim:
1. A lawful interception method for an intercepting user equipment, the intercepting user equipment being used in a 3GPP direct mode communication system, the 3GPP direct mode communication system comprising the intercepting user equipment, a first user equipment, an administrating server and an eNB, the lawful interception method comprising: (a) registering, by the intercepting user equipment, to the administrating server via the eNB for lawful interception; (b) receiving, by the intercepting user equipment, a positive interception message from the administrating server via the eNB after step (a), wherein the positive interception message comprises a first identification of the first user equipment; (c) receiving, by the intercepting user equipment, a first signal from the first user equipment based on the first identification; (d) determining, by the intercepting user equipment, that a first power measurement of the first signal does not exceed a threshold; (e) transmitting, by the intercepting user equipment, a power adjustment request to the administrating server via the eNB based on the result of step (d) so that the administrating server notifies the eNB of transmitting a power adjustment command to the first user equipment for adjusting transmitting power of the first user equipment; (f) intercepting, by the intercepting user equipment, communication data of the first user equipment based on the first user identification after step (e).