Handover method of multicast and broadcast service based on buffer fullness
A method of a mobile station receiving data packets from a serving base station via a multicast or broadcast connection in a wireless network is provided for performing a handover from the serving base station to a target base station. The method comprises, at the level of the mobile station, the steps of: upon the detection of the quantity of buffered data packets in the mobile station being lower than a first threshold value, establishing a unicast connection with the serving base station to receive data packets from the serving base station; and upon detection of the level of buffered data packets reaching the predetermined threshold level, performing a handover from the serving base station to the target base station. According to the invention, a seamless handover of a mobile station in a wireless network providing Multicast and Broadcast Service (MBS service) can be achieved to prevent the MBS service interruption during the handover.
1. A method of a mobile station receiving data packets from a serving base station via a multicast or broadcast connection in a wireless network for performing a handover from the serving base station to a target base station, the method comprises, performed by the mobile station:
detecting a quantity of buffered data packets in the mobile station;
upon the detection of the quantity of buffered data packets in the mobile station being lower than a first threshold value, establishing a unicast connection with the serving base station to receive the data packets from the serving base station; and
upon the detection of the quantity of the buffered data packets reaching the first threshold value, performing a handover from the serving base station to the target base station;
wherein the first threshold value is determined as a function of network delay jitter information of the wireless network and average handover time of mobile stations in the wireless network.
2. The method according to claim 1 , further comprising receiving a message containing the network delay jitter information of the wireless network and average handover time of the mobile stations in the wireless network, the message being broadcasted in the wireless network.
3. The method according to claim 1 , further comprising terminating the unicast connection upon detection of the level of buffered data packets reaching the first threshold value.
4. The method according to claim 1 , wherein said data packets are for the multicast and the broadcast service.
5. A mobile station in a wireless network, the mobile station comprising:
a buffer that buffers data packets received from a serving base station; and
a processor configured to:
detect a quantity of buffered data packets in the buffer;
establish a unicast connection with the serving base station to receive data packets from the serving base station upon the detected quantity of buffered data packets being lower than a first threshold value;
perform a handover from the serving base station to a target base station upon the detection of the quantity of buffered data packets reaching the first threshold value;
wherein the first threshold value is determined as a function of network delay jitter information of the wireless network and average handover time of mobile stations in the wireless network.
6. The mobile station according to claim 5 , wherein the processor is further configured to receive a message containing the network delay jitter information of the wireless network and average handover time of the mobile stations in the wireless network, the message being broadcasted in the wireless network.
7. The mobile station according to claim 5 , wherein the processor is further configured to terminate the unicast connection upon detection of the level of buffered data packets reaching the first threshold value.
8. The mobile station according to claim 5 , wherein said data packets are for the multicast and the broadcast service.