System and method for efficient use of radio resources in multicast services in mobile wireless communications systems

• US 9,088,963 B2
• Filed: 05/22/2013
• Issued: 07/21/2015
• Est. Priority Date: 05/22/2012
• Status: Active Grant

• Current Assignee: Hughes Network Systems LLC (Echostar Corporation)
• Original Assignee: Hughes Network Systems LLC (Echostar Corporation)
• Inventors: Ravishankar, Channasandra, Arur, Deepak, Benammar, Nassir
• Primary Examiner(s): Lee, Andrew
• Application Number:
  US13/900,501
• Publication Number:
  US 20130315125A1
• Time in Patent Office: 790 Days
• Field of Search: 370/312, 370/392, 370/390, 370/432
• US Class Current: 1/1
• CPC Class Codes: H04L 12/1836 with heterogeneous network architecture
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• CPC Class Codes: H04W 36/0007 for multicast or broadcast services, e.g. MBMS multicast or broadcast application services H04W4/06; resource management for broadcast services H04W72/30; connection management for selective distribution or broadcast H04W76/40
• CPC Class Codes: H04W 36/0009 for a plurality of users or terminals, e.g. group communication or moving wireless networks user group management H04W4/08; processing of subscriber group data H04W8/186
• CPC Class Codes: H04W 36/026 Multicasting of data during hand-off
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface
• CPC Class Codes: H04W 72/30 Resource management for broadcast services
• CPC Class Codes: H04W 76/40 for selective distribution or broadcast

Abstract

Approaches for resource efficient multicast communications in mobile satellite systems are provided. A wireless gateway is configured to encapsulate multicast signaling messages received from participating remote terminals. The encapsulation is compatible with the core network of the system, whereby the signaling is passed through the core network undetected. The signaling is received by a multicast gateway, and provides necessary IP and port addressing information for the multicast gateway to encapsulate the multicast session data in a manner compatible with the core network. Upon receiving multicast session data from a multicast server, the multicast gateway replicates and encapsulates each data packet with IP and port addressing for each participating remote terminal, which is also passed through the core network undetected. The wireless gateway receives the replicated data packets, and based on the encapsulation information, transmits each data packet via a broadcast transmission to each cell wherein participating terminals are located.

Claims

1. A method comprising:

receiving, by a wireless gateway of a communications network, a message packet from a host terminal, wherein the message packet is destined for a multicast control node of the communications network, and the message packet includes a multicast session identifier that identifies a multicast session being joined by the host terminal;

encapsulating the message packet as a transport layer unicast tunnel packet, including at least one source identifier of the host terminal and at least one destination identifier of the multicast control node; and

transmitting the transport layer unicast tunnel packet to the multicast control node, wherein the transport layer unicast tunnel packet is configured to direct the multicast control node to bind to a multicast distribution tree associated with the multicast session.

2. The method of claim 1, wherein the encapsulation of the message packet as a transport layer unicast tunnel packet comprises a UDP encapsulation, wherein the source identifiers of the host terminal comprise a private IP address of the host terminal and a respective assigned TCP/UDP port, and the destination identifiers of the multicast control node comprise an IP address of the multicast control node and a predefined destination UDP port monitored by the multicast control node.

3. The method of claim 1, further comprising:

encapsulating the transport layer unicast tunnel packet as a core network unicast tunnel packet in accordance with a core network tunneling protocol, and, instead of transmitting the transport layer unicast tunnel packet, transmitting the core network unicast tunnel packet to the multicast control node via a core network of the communications network.

4. The method of claim 3, further comprising:

receiving, by a gateway node of the core network, the core network unicast tunnel packet;

de-encapsulating the core network unicast tunnel packet encapsulation and translating the transport layer unicast tunnel packet encapsulation by converting the at least one source identifier of the respective host terminal to corresponding translated network identifiers; and

transmitting, by the gateway node of the core network, the translated transport layer unicast tunnel packet to the multicast control node.

5. The method of claim 4, further comprising:

receiving, by the multicast control node, the translated transport layer unicast tunnel packet; and

de-encapsulating the translated transport layer unicast tunnel packet encapsulation, and transmitting the de-encapsulated packet to a multicast server.

6. The method of claim 5, wherein:

the encapsulation of the message packet as a transport layer unicast tunnel packet comprises a UDP encapsulation, wherein the source identifiers of the host terminal comprise a private IP address of the host terminal and a respective assigned TCP/UDP port, and the destination identifiers of the multicast control node comprise an IP address of the multicast control node and a predefined destination UDP port monitored by the multicast control node;

the translation of the transport layer unicast tunnel packet encapsulation comprises converting the private IP address of the host terminal to a public IP address of an operator controlling the multicast session, and converting the assigned TCP/UDP port to a modified source port assigned to the respective host terminal for the multicast session.

7. A method comprising:

receiving, by a multicast control node of a communications network, a multicast control message packet that originated from a host terminal, wherein the multicast control message packet includes a multicast session identifier that identifies a multicast session being joined by the host terminal, and wherein the multicast control message is encapsulated as a transport layer unicast tunnel packet, including at least one source identifier of the host terminal and at least one destination identifier of the multicast control node; and

upon receipt of the transport layer tunnel packet by the multicast control node, binding the multicast control node to a multicast distribution tree associated with the multicast session.

8. The method of claim 7, further comprising:

de-encapsulating the transport layer unicast tunnel packet encapsulation, and transmitting the de-encapsulated packet to a multicast server.

9. The method of claim 7, wherein the encapsulation of the multicast control message as a transport layer unicast tunnel packet comprises a UDP encapsulation, wherein the source identifiers of the host terminal comprise a private IP address of the host terminal and a respective assigned TCP/UDP port, and the destination identifiers of the multicast control node comprise an IP address of the multicast control node and a predefined destination UDP port monitored by the multicast control node.

10. A method comprising:

receiving, by a multicast control node of a communications network, a multicast data packet of a multicast data stream, wherein the multicast data packet includes session data of a multicast session, at least one source identifier of a multicast server and at least one destination identifier of the multicast session;

replicating the multicast data packet for transmission as an individual unicast transmission, via a core network of the communications network, to each of a plurality of host terminals participating in the multicast session;

encapsulating each replication of the multicast data packet as a transport layer unicast tunnel packet, including at least one source identifier of the multicast control node and at least one destination identifier of a respective one of the host terminals participating in the multicast session; and

transmitting each encapsulated replication packet, via a core network of the communications network, for delivery to the respective host terminal.

11. The method of claim 10, wherein:

the source identifiers of the multicast server comprise an IP address of the multicast server and a UDP port designated for the multicast session, and the destination identifiers of the associated multicast session comprise an IP address assigned to the multicast session and the UDP port designated for the multicast session; and

the encapsulation of each replication of the multicast data packet as a transport layer unicast tunnel packet comprises a UDP encapsulation, wherein the source identifiers of the multicast control node comprise an IP address of the multicast control node and a predefined UDP port monitored by the multicast control node, and the destination identifiers of the respective host terminal comprises an IP address of the host terminal and a respective assigned TCP/UDP port.

12. The method of claim 10, further comprising:

receiving, by a gateway node of the core network, the encapsulated replication packets;

translating the transport layer unicast tunnel packet encapsulation of each of the received encapsulated replication packets by converting the at least one destination identifier of the respective host terminal to corresponding translated network identifiers;

encapsulating each translated transport layer unicast tunnel packet as a core network unicast tunnel packet in accordance with a core network tunneling protocol; and

transmitting each core network unicast tunnel packet, via a core network of the communications network, to a wireless gateway of the communications network for the delivery to the respective host terminal.

13. The method of claim 12, further comprising:

receiving, by the wireless gateway, the core network unicast tunnel packets;

de-encapsulating the core network unicast tunnel packets to obtain the data packet of the multicast data stream, including the session data, the source identifiers of the multicast server and the destination identifiers of the multicast session;

transmitting the de-encapsulated multicast data packet as a wireless broadcast transmission to each of a plurality of wireless coverage cells within which at least one of the host terminals participating in the multicast session is located.

14. The method of claim 13, wherein:

the source identifiers of the multicast server comprise an IP address of the multicast server and a UDP port designated for the multicast session, and the destination identifiers of the associated multicast session comprise an IP address assigned to the multicast session and the UDP port designated for the multicast session; and

the encapsulation of each replication of the packet as a transport layer unicast tunnel packet comprises a UDP encapsulation, wherein the source identifiers of the multicast control node comprise an IP address of the multicast control node and a predefined UDP port monitored by the multicast control node, and the destination identifiers of the respective host terminal comprises an IP address of the host terminal and a respective assigned TCP/UDP port.

15. A method comprising:

receiving, by a wireless gateway of a communications network, a plurality of encapsulated multicast data packets, wherein each of the multicast data packets comprises a replication of a data packet of a multicast data stream of a multicast session, including at least one source identifier of a multicast server and at least one destination identifier of an associated multicast session; and

wherein each of the multicast data packets is encapsulated as a transport layer unicast tunnel packet, including at least one source identifier of a multicast control node of the communications network and at least one destination identifier of a respective one of a plurality of host terminals participating in the multicast session; and

de-encapsulating the multicast data packets to obtain the data packet of the multicast data stream, including the session data, the source identifiers of the multicast server and the destination identifiers of the multicast session;

transmitting the de-encapsulated multicast data packet as a wireless broadcast transmission to each of a plurality of wireless coverage cells within which at least one of the host terminals participating in the multicast session is located.

16. The method of claim 15, wherein:

the source identifiers of the multicast server comprise an IP address of the multicast server and a UDP port designated for the multicast session, and the destination identifiers of the associated multicast session comprise an IP address assigned to the multicast session and the UDP port designated for the multicast session; and

the encapsulation of each of the multicast data packets as a transport layer unicast tunnel packet comprises a UDP encapsulation, wherein the source identifiers of the multicast control node comprise an IP address of the multicast control node and a predefined UDP port monitored by the multicast control node, and the destination identifiers of the respective host terminal comprises an IP address of the host terminal and a respective assigned TCP/UDP port.

17. An apparatus of a communications network, comprising:

a receiver configured to receive wireless communications from remote terminals;

a processor configured to encapsulate a message packet received by the receiver from a host remote terminal, wherein the message packet is destined for a multicast control node of the communications network, and the message packet includes a multicast session identifier that identifies a multicast session being joined by the host remote terminal, and wherein the encapsulation of the message comprises encapsulation as a transport layer unicast tunnel packet, including at least one source identifier of the host terminal and at least one destination identifier of the multicast control node; and

a transmitter configured to transmit the transport layer unicast tunnel packet to the multicast control node, wherein the transport layer unicast tunnel packet is configured to direct the multicast control node to bind to a multicast distribution tree associated with the multicast session.

18. The apparatus of claim 17, wherein the encapsulation of the message packet as a transport layer unicast tunnel packet comprises a UDP encapsulation, wherein the source identifiers of the host terminal comprise a private IP address of the host terminal and a respective assigned TCP/UDP port, and the destination identifiers of the multicast control node comprise an IP address of the multicast control node and a predefined destination UDP port monitored by the multicast control node.

19. The apparatus of claim 17, wherein the processor is further configured to:

encapsulate the transport layer unicast tunnel packet as a core network unicast tunnel packet in accordance with a core network tunneling protocol, wherein, instead of the transport layer unicast tunnel packet, the transmitter is configured to transmit the core network unicast tunnel packet to the multicast control node via a core network of the communications network.

20. An apparatus of a communications network, comprising:

a receiver configured to receive terrestrial communications from a core network of the communications network;

a processor configured to process a multicast control message packet received by the receiver and originating from a host remote terminal, wherein the multicast control message packet includes a multicast session identifier that identifies a multicast session being joined by the host terminal, and wherein the multicast control message is encapsulated as a transport layer unicast tunnel packet, including at least one source identifier of the host terminal and at least one destination identifier of the multicast control node; and

based on the processing of the multicast control message packet, the processor is further configured to bind the apparatus to a multicast distribution tree associated with the multicast session.

21. The apparatus of claim 20, wherein the processor is further configured to de-encapsulate the transport layer unicast tunnel packet encapsulation, and the apparatus further comprises a transmitter configured to transmit the de-encapsulated packet to a multicast server.

22. The apparatus of claim 20, wherein the encapsulation of the multicast control message as a transport layer unicast tunnel packet comprises a UDP encapsulation, wherein the source identifiers of the host terminal comprise a private IP address of the host terminal and a respective assigned TCP/UDP port, and the destination identifiers of the multicast control node comprise an IP address of the multicast control node and a predefined destination UDP port monitored by the multicast control node.

23. An apparatus of a communications network, comprising:

a receiver configured to receive terrestrial communications destined for the communications network;

a processor configured to process a multicast data packet of a multicast data stream received by the receiver, wherein the multicast data packet includes session data of a multicast session, at least one source identifier of a multicast server and at least one destination identifier of the multicast session, wherein the processing of the multicast data packet comprises;

replicating the data packet for transmission as an individual unicast transmission, via a core network of the communications network, to each of a plurality of host terminals participating in the multicast session; and

encapsulating each replication of the packet as a transport layer unicast tunnel packet, including at least one source identifier of the multicast control node and at least one destination identifier of a respective one of the host terminals participating in the multicast session; and

a transmitter configured to transmit each encapsulated replication packet, via a core network of the communications network, for delivery to the respective host terminal.

24. The apparatus of claim 23, wherein:

the source identifiers of the multicast server comprise an IP address of the multicast server and a UDP port designated for the multicast session, and the destination identifiers of the associated multicast session comprise an IP address assigned to the multicast session and the UDP port designated for the multicast session; and

the encapsulation of each replication of the packet as a transport layer unicast tunnel packet comprises a UDP encapsulation, wherein the source identifiers of the multicast control node comprise an IP address of the multicast control node and a predefined UDP port monitored by the multicast control node, and the destination identifiers of the respective host terminal comprises an IP address of the host terminal and a respective assigned TCP/UDP port.

25. An apparatus of a communications network, comprising:

a receiver configured to receive terrestrial communications from a core network of the communications network;

a processor configured to process a plurality of multicast data packets received by the receiver from the core network, wherein each of the multicast data packets comprises a replication of a data packet of a multicast data stream of a multicast session, including at least one source identifier of a multicast server and at least one destination identifier of an associated multicast session; and

wherein each of the multicast data packets is encapsulated as a transport layer unicast tunnel packet, including at least one source identifier of a multicast control node of the communications network and at least one destination identifier of a respective one of a plurality of host terminals participating in the multicast session, wherein the processing of the multicast data packets comprises de-encapsulating the multicast data packets to obtain the data packet of the multicast data stream, including the session data, the source identifiers of the multicast server and the destination identifiers of the multicast session; and

a wireless transmitter configured to transmit the de-encapsulated multicast data packet as a wireless broadcast transmission to each of a plurality of wireless coverage cells within which at least one of the host terminals participating in the multicast session is located.

26. The apparatus of claim 25, wherein:

the source identifiers of the multicast server comprise an IP address of the multicast server and a UDP port designated for the multicast session, and the destination identifiers of the associated multicast session comprise an IP address assigned to the multicast session and the UDP port designated for the multicast session; and

the encapsulation of each of the multicast data packets as a transport layer unicast tunnel packet comprises a UDP encapsulation, wherein the source identifiers of the multicast control node comprise an IP address of the multicast control node and a predefined UDP port monitored by the multicast control node, and the destination identifiers of the respective host terminal comprises an IP address of the host terminal and a respective assigned TCP/UDP port.