Mobile communication system, core network apparatus, and MBMS data transmission method used for the same

A core network apparatus in a mobile communication system which comprises eNBs (E-UTRAN (Evolved Universal Terrestrial Radio Access Network) NodeBs) which are configured by integrating functions of a radio network controller and functions of a radio base station, wherein

• the core network apparatus is provided as a Network Time Protocol (NTP) server and supplies clocks to the eNBs which are NTP clients;
• and
• the core network apparatus comprises:
• an acquisition unit for acquiring transmission link delay information between the core network apparatus and each of the eNBs by periodically performing synchronization processing to each of the eNBs;
• a determination unit for determining a time of transmission based on the transmission link delay information acquired by the acquisition unit;
• and
• a unit for copying Multimedia Broadcast Multicast Service (MBMS) data as many as the eNBs, adding time information determined by the determination unit to each of copied MBMS data and transmitting the MBMS data to each of the eNBs,
• wherein the core network apparatus is a User Plane Entity (UPE).

An MBMS (Multimedia Broadcast Multicast Service) data transmission method for use in a mobile communication system which comprises eNBs (Evolved Universal Terrestrial Radio Access Network (E-UTRAN) NodeBs) which are configured by integrating functions of a radio network controller and functions of a radio base station, and a core network apparatus which is provided as an NTP (Network Time Protocol) server and supplies clocks to the eNBs which are NTP clients, comprising:

• acquiring transmission link delay information between the core network apparatus and each of the eNBs by periodically performing synchronization processing to each of the eNBs;
• determining a time of transmission based on the transmission link delay information;
• copying MBMS data as many as the eNBs;
• adding the determined time information to each of copied MBMS data;
• and
• transmitting the MBMS data to each of the eNBs,
• wherein the core network apparatus is a User Plane Entity (UPE).

A mobile communication system which comprises eNBs (Evolved Universal Terrestrial Radio Access Network (E-UTRAN) NodeBs) which are configured by integrating functions of a radio network controller and functions of a radio base station, and a core network apparatus, wherein

• the core network apparatus is provided as a Network Time Protocol (NTP) server and supplies clocks to the eNBs which are NTP clients;
• and
• the core network apparatus comprises:
• acquisition means for acquiring transmission link delay information between the core network apparatus and each of the eNBs by periodically performing synchronization processing to each of the eNBs;
• determination means for determining a time of transmission based on the transmission link delay information acquired by the acquisition means;
• and
• means for copying Multimedia Broadcast Multicast Service (MBMS) data as many as the eNBs, adding time information determined by the determination means to each of copied MBMS data and transmitting the MBMS data to each of the eNBs,
• wherein the core network apparatus is a User Plane Entity (UPE).

A core network apparatus in a mobile communication system which comprises eNBs (E-UTRAN (Evolved Universal Terrestrial Radio Access Network) NodeBs) which are configured by integrating functions of a radio network controller and functions of a radio base station, wherein

• the core network apparatus is provided as a Network Time Protocol (NTP) server and supplies clocks to the eNBs which are NTP clients;
• and
• the core network apparatus comprises:
• acquisition means for acquiring transmission link delay information between the core network apparatus and each of the eNBs by periodically performing synchronization processing to each of the eNBs;
• determination means for determining a time of transmission based on the transmission link delay information acquired by the acquisition means;
• and
• means for copying Multimedia Broadcast Multicast Service (MBMS) data as many as the eNBs, adding time information determined by the determination means to each of copied MBMS data and transmitting the MBMS data to each of the eNBs,
• wherein the core network apparatus is a User Plane Entity (UPE).