WE CLAIM:
1. A communication system, comprising:
a communication terminal device; and
a plurality of nodes configured to be connected to the communication terminal device for radio communication and to provide a split bearer for the communication terminal device,
wherein the communication terminal device is configured to perform uplink transmission to an uplink transmission node among the plurality of nodes, and
the uplink transmission node is determined by an uplink transmission node determination process in which a node that provides the uplink transmission from the communication terminal device with lower latency among the plurality of nodes is determined as the uplink transmission node.
2. The communication system according to claim 1,
wherein a master node of the split bearer among the plurality of nodes is configured to perform the uplink transmission node determination process.
3. The communication system according to claim 2,
wherein the master node is configured to perform the uplink transmission node determination process based on determination information for determining the uplink transmission node, and
the master node is configured to:
obtain determination information associated with a secondary node of the split bearer among the plurality of nodes; and

determine the uplink transmission node based on the determination information associated with the secondary node and determination information associated with the master node.
4. The communication system according to claim 1,
wherein the communication terminal device is configured to perform the uplink transmission node determination process.
5. The communication system according to claim 4,
wherein the communication terminal device is configured to perform the uplink transmission node determination process based on determination information for determining the uplink transmission node, and
the communication terminal device is configured to:
obtain determination information associated with each of the plurality of nodes; and
determine the uplink transmission node based on the determination information associated with each of the plurality of nodes.
6. A communication terminal device configured to perform radio communication with a
plurality of nodes that provide a split bearer,
wherein the communication terminal device is configured to perform uplink transmission to an uplink transmission node selected by an uplink transmission node determination process, and
the uplink transmission node determination process is a process for determining, as the uplink transmission node, a node that provides the uplink transmission from the

communication terminal device with lower latency among the plurality of nodes.
7. A communication node configured to provide a split bearer for a communication terminal device together with another communication node,
wherein the communication node is configured to operate as an uplink transmission node to be used by the communication terminal device for uplink transmission, by being selected by an uplink transmission node determination process, and
the uplink transmission node determination process is a process for determining, as the uplink transmission node, a node that provides the uplink transmission from the communication terminal device with lower latency among the plurality of nodes.