Multipath TCP subflow establishing on single IP connection
The present disclosure relates to a method, performed in a single IP-address source node in a wireless communication network, of establishing a multipath TCP, MPTCP, connection for transfer of TCP data in MPTCP subflows to a destination node. The single IP-address source node receives an MPTCP trigger to activate a multipath TCP connection. One or more source TCP ports are selected, wherein each source TCP port is selected to constitute a starting point of an MPTCP subflow. One or more MPTCP notifications are sent to the destination node. Each MPTCP notification includes information on a selected source TCP port. The single IP-address source node receives an acknowledgment of each MPTCP notification from the destination node. The present disclosure also relates to corresponding method performed in a destination node and a wireless device configured for establishing an MPTCP connection.
1. A method, performed in a single internet protocol, IP, address source node in a wireless communication network, of establishing a multipath transmission control protocol, MPTCP, connection for transfer of transmission control protocol, TCP, data in MPTCP subflows to a destination node, the method comprising:
receiving an MPTCP trigger to activate a multipath TCP connection;
selecting, at the single IP address node, at least one source TCP port, each source TCP port selected to constitute a starting point of an MPTCP subflow;
sending at least one MPTCP notification to the destination node, each MPTCP notification including information on a selected source TCP port; and
receiving an acknowledgment of each MPTCP notification from the destination node.
2. The method according to claim 1 , further comprising:
associating each MPTCP subflow to a respective wireless link.
3. The method according to claim 1 , wherein activation of the multipath TCP connection comprises initiating at least one further subflow for an established TCP connection.
4. The method according to claim 3 , wherein the MPTCP trigger is received in a three way TCP handshake establishing a first connection between the single IP-address source node and the destination node.
5. The method according to claim 2 , further comprising communicating information on each association by means of a respective Traffic Flow Template, TFT.
6. The method according to claim 1 , wherein the MPTCP trigger is received in a message on a radio access protocol layer from a network entity.
7. The method according to claim 4 , wherein the MPTCP trigger is received in one of a Radio Resource Control, RRC, Packet Data Convergence Protocol, PDCP, Radio Link Control, RLC, and Medium Access Control, MAC, protocol layer message.
8. The method according to claim 1 , further comprising:
providing an indication on the received MPTCP trigger to an MPTCP entity in the single IP-address source node configured to at least one of add and remove MPTCP subflows.
9. The method according to claim 7 , wherein the indication to the MPTCP entity is provided in MPTCP signaling.
10. The method according to claim 6 , wherein the indication to the MPTCP entity is provided in a protocol extension of MPTCP signaling.
11. The method according to claim 1 , wherein a MPTCP subflow is established over a 3 rd Generation Partnership Project, 3GPP, Radio Access Technology, RAT, wireless link.
12. The method according to claim 1 , wherein a MPTCP subflow is established over one of a LTE and WCDMA/HSPA wireless link.
13. The method according to claim 1 , wherein a MPTCP subflow is established over a Wireless Local Area Network, WLAN, wireless link.
14. The method according to claim 1 , wherein the destination node is a MPTCP enabled server.
15. The method according to claim 1 , wherein the destination node is a MPTCP proxy.
16. A method in a destination node of a wireless communication system of establishing a multipath transmission control protocol, MPTCP, connection for receipt of transmission control protocol, TCP, data in MPTCP subflows from a single internet protocol, IP, address source node, the method comprising:
receiving at least one multipath TCP, MPTCP, notification from the single IP-address source node, each MPTCP notification including information on a selected source TCP port;
sending an acknowledgement of each received MPTCP notification to the single IP-address source node, the acknowledgement including information on a selected destination port;
receiving information on association between a source TCP port and a respective wireless link;
storing the association between source TCP port and a respective wireless link; and
retrieving at least one stored association to identify and separate each MPTCP subflow of the MPTCP connection.
17. A single internet protocol, IP, address wireless device in a wireless communication network, the wireless device configured for establishing a multipath transmission control protocol, MPTCP, connection for transfer of transmission control protocol, TCP, data in MPTCP subflows, the single IP-address wireless device comprising:
a communication interface configured to receive, at the single IP-address wireless device, an MPTCP trigger to activate a multipath TCP connection and to send at least one MPTCP notification; and
a processor including a multipath TCP, MPTCP, port selector configured to select, at the single IP-address wireless device, at least one source TCP port, each source TCP port selected to constitute a starting point of an MPTCP subflow; and an MPTCP notifier configured to include information on a selected source TCP port in a respective MPTCP notification.
18. The method according to claim 2 , wherein activation of the multipath TCP connection comprises initiating at least one further subflow for an established TCP connection.
19. The method according to claim 18 , further comprising:
providing an indication on the received MPTCP trigger to an MPTCP entity in the single IP-address source node configured to at least one of add and remove MPTCP subflows.
20. The method according to claim 1 , wherein the establishing of the MPTCP connection occurs at a protocol layer below an IP protocol layer.