Connection management method for mobile device group

A connection management method for mobile device group, applied to a mobile device group, the mobile device group including a plurality of mobile devices, one of the mobile devices set to a leader mode as a leader, each of the other mobile devices set to a follower mode as a follower, the leader and each of the followers connected by device to device (D2D) connection, the connection management method comprising:

• receiving, by the leader, a measurement control from a first base station;
• acquiring, by the leader, a first leader signal quality corresponding to the first base station and a second leader signal quality corresponding to a second base station in response to the measurement control;
• transmitting, by the leader, the measurement control to the followers;
• for each of the followers of the mobile device group, acquiring, by each of the followers, a first follower signal quality corresponding to the first base station, a second follower signal quality corresponding to the second base station and a sidelink signal quality corresponding to the leader in response to the measurement control;
• sending, by each of the followers, the first follower signal quality, the second follower signal quality and the sidelink signal quality to the leader;
• sending, by the leader, the first leader signal quality, the second leader signal quality, the first follower signal qualities, the second follower signal qualities and the sidelink signal qualities to the first base station;
• determining, by the first base station, whether to perform a handover according to the first leader signal quality, the second leader signal quality, the first follower signal qualities, the second follower signal qualities and the sidelink signal qualities;
• and
• determining, by the first base station, whether to perform a half handover procedure according to the first leader signal quality, the second leader signal quality, the first follower signal qualities, the second follower signal qualities and the sidelink signal qualities to cause the mobile device group to handover from the first base station to the second base station when the first base station determines to perform the handover, wherein:
• when the first leader signal quality is lower than a first threshold, the second leader signal quality is higher than or equal to a second threshold, the second follower signal qualities are higher than or equal to a third threshold, at least one of the first follower signal qualities is higher than or equal to a fourth threshold, and at least one of the sidelink signal qualities is lower than a fifth threshold, the half handover procedure is performed, and the at least one follower, having the at least one first follower signal quality which is higher than or equal to the fourth threshold and having the at least one sidelink signal quality which is lower than the fifth threshold, enters a half mode and is configured as at least one half mode follower;
• or
• when the first leader signal quality is lower than the first threshold, the second leader signal quality is higher than or equal to the second threshold, at least one of the second follower signal qualities is lower than the third threshold, and at least one of the first follower signal qualities is higher than or equal to the fourth threshold, the half handover procedure is performed, and the at least one follower, having the at least one second follower signal threshold which is lower than the third threshold and having the at least one first follower signal quality which is higher than or equal to the fourth threshold, enters a half mode and is configured as the at least one half mode follower.

A connection management method for mobile device group, applied to a mobile device group, the mobile device group including a plurality of mobile devices, one of the mobile devices set to a leader mode as a leader, each of the other mobile devices set to a follower mode as a follower, the leader and each of the followers connected by device to device (D2D) connection, the connection management method comprising:

• receiving, by the leader, a measurement control from a first base station;
• acquiring, by the leader, a first leader signal quality corresponding to the first base station and a second leader signal quality corresponding to a second base station in response to the measurement control;
• transmitting, by the leader, the measurement control to the followers;
• for each of the followers of the mobile device group, acquiring, by each of the followers, a first follower signal quality corresponding to the first base station, a second follower signal quality corresponding to the second base station and a sidelink signal quality corresponding to the leader in response to the measurement control;
• sending, by each of the followers, the first follower signal quality, the second follower signal quality and the sidelink signal quality to the leader;
• sending, by the leader, the first leader signal quality, the second leader signal quality, the first follower signal qualities, the second follower signal qualities and the sidelink signal qualities to the first base station;
• determining, by the first base station, whether to perform a handover according to the first leader signal quality, the second leader signal quality, the first follower signal qualities, the second follower signal qualities and the sidelink signal qualities;
• determining, by the first base station, whether to perform a half handover procedure according to the first leader signal quality, the second leader signal quality, the first follower signal qualities, the second follower signal qualities and the sidelink signal qualities to cause the mobile device group to handover from the first base station to the second base station when the first base station determines to perform the handover;
• determining whether to perform a leader swap procedure according to the first leader signal quality;
• and
• performing the leader swap procedure when the leader swap procedure is determined to be performed,
• wherein the leader swap procedure comprises:
• selecting at least one of candidate from the followers according to the first follower signal qualities;
• acquiring, by each of the at least one candidate, a candidate sidelink measurement report, and sending the candidate sidelink measurement report to the leader;
• selecting, by the leader or the first base station, a successor from the at least one candidate according to the at least one candidate sidelink measurement report, and sending a result of successor selection to the followers by the leader;
• and
• setting the leader to the follower mode as the follower, and setting the mobile device which is selected as the successor to the leader mode as the leader.