WO2013122525A1

WO2013122525A1 - P2p streaming support

Info

Publication number: WO2013122525A1
Application number: PCT/SE2012/050619
Authority: WO
Inventors: Ayodele Damola
Original assignee: Telefonaktiebolaget L M Ericsson (Publ)
Priority date: 2012-02-16
Filing date: 2012-06-08
Publication date: 2013-08-22
Also published as: EP2815557A1; US20150381675A1; CN104106252A; EP2815557B1; US9723042B2; CN104106252B

Abstract

The present invention relates to methods and arrangements to optimize load transportation between a P2P live streaming network (12) and an access network (30}. The method comprises steps like: - A peer (16) in the access network selects a live channel to use. ~ A request (57) comprising information of the selected channel is sent from the access network to the streaming network, - A converter node (4.0) connecting the P2P live streaming network and the access network detects that number of peers (16-19) in the access network using the selected channel has reached a predetermined threshold value (T) - Chunks that are parts of the selected channel arriving from peers (13-15) in the streaming network are converted in the converter node (40) from P2P format to multicast format.

Description

P2P STRK&MIMG SUPPORT

The present embodiments generally relate to systems and methods and, more particularly, to mechanisms and techniques for enabling_, optimized load transportation between a P2P live streaming network and an access network.

B e&ORQOTSB

Companies a e rapidly adding dynamic, rich and interactive capabilities to improve user experiences, grow online audiences,, and drive page views and transactions. As web sites evolve toward, completely rich, dynamic online channel experiences, businesses face a new, but stark challenge. Today's consumers have come to. expect, highly interactiv online experi nces. When e..g, watching a movie, they demand a smooth, flawless experience. In the international Application W02QIG/Q05349 is disclosed, a method for an IPTV Set Top Box to access content from an external domain outside the IPTV service prov der ' s domain by retrieving and converting required content from the external domain into a format that is accessibl via the F V Set Top Box,

P2P streaming applications work in much the same way as other P2P file share clients except that instead of downloading files, the users download streams. These streams are then exchanged in real-time with other users.

Figure 1 discloses Peer2view (P2View) wh ch is a Peer-to- Peer live streaming application. Figure 1 shows an Internet network 12 comprising P2View peers 13-15. The figure also discloses an origin server 10, a Content Distribution Network CDN 11 and a P2P client 16. The figure shows delivering of HTTP streams .made out of HTTP chunks 1-6. The chunks are delivered either from the origin server or a server in the content distribution network CDN i.e. the file that is to be streamed has been broken up in chunks and is streamed from either the origin server or a server in the CDN network. In case many clients simultaneously ask for streams from a server it may result in. system overload. Due to this, instead of having one server (origin- or CDN) the server has been broken down into smaller peers (Peer2View peers in the internet} and the chunks are now also part of every peer 13-15. When the P2P client 16 is looking for e.g. chunk A it will make a decision, which chunk source is the closest or shortest in terms -of delay, and fetch chunk 4 from there.. .An example of the basic principle is as follows. ien the P2P client 16 enters the system, the- client starts to ask. for existing, video stream channels. The client hereb contacts a. channel list server (not in figure) and the server returns back a list of .channels. The client makes a selection of a desired channel .and contacts a tracker (not in figure) in .the Internet- network. The tracker knows of ail the peers 13-15 already .receiving the channel of interest. The tracker also has knowledge of the CDN server 11 and the origin server 10 , The -P2P client performs measurements e.g. by using a BART method for available bandwidth estimation, between all replied peers to see which peer is the most appropriate to ask for a needed chunk and then make a chunk request .

Problems exist with the above described technique. first problem is that the P2P stream generates a lot of traffic. According- to P2P principles, if a chunk is received, the recipient of the chunk has to share a chunk back. The problem with P2P is that when there is an ^¾unl.im.i ted" amount of peers receiving and sharing, it will be difficult for the operator to dimension network capacity. A second problem is that the impact of this big amount of traffic on the network creates contention for best effort traffic class. A third problem is extra costs such as increased costs for mobile access (air-interface) , transport cost in aggregatio and backbone network, and increased cost for Internet peering .

An aim of the embodiments is. to overcome above mentioned limita ions of the prior art. The embodiments focus on sending P2P live- streaming i a non-P2P: way by putting together via a converter node, a Multicast Server in an access network with a P2P live streaming network . If peers in the access network are using./ iewing the same channel and if the number of the peers is above a threshold value, instead of using- P2P, multicasting for^' chunk transportation will be used.

An. ob ect of the invention is to optimize load transportation .

The solution in one exemplified embodiment is a method to optimize load transportation between a P2P live streaming network and an access network. The method comprises the foilowing st s : A peer in the access network selects a live channel to. u e .

- request comprising information of the selected channel is sent from the access network to the streaming network.

A converter node connecting the P2P live streaming network and the access network, detects that number of peers in the access network using the selected, channel has reached a predetermined threshold valu .

- Chunks that are parts of the selected channel, arriving from peers (13-15) in the streaming network, are converted in the converter node to multicast format.

The solution in another exemplified embodiment is a network ^•node of a telecommunication network configured to optimise load transporta ion. The network node comprises ;

Means, for intercepting signalling transmitted from., peers in a access network to a P2P live streaming network.

Means for detecting reach of a threshold value corresponding to number of peers in th access network using selected channel.

Means for converting chunks received from peers in the P2P live streaming network into multicas format .

The solution in yet another exemplified, embodiment is a terminal node in a telecommunication. network being configured. to receive multicast streaming. The node comprises :

- Means for extracting bearer information received from a multicast server .

- Means for receiving a switch message initiating receiving of multicast streaming.

- Means for opening a multicast socket.

- Means for stopping a P2P streaming client. Some advantages of the embodiments are as follows:

The solution makes possible utilization of enhanced Multimedia Broadcast and Multicast services eMBMS for the delivery of live streams in Long Term Evolution LTE that are distributed via P2P over the internet.

The solution enables/allows to get rid of P2P traffic in the network which, consumes a lot of bandwidth and deliver streams using multicast which is the preferred way of delivery 1-n s reams.

The invention will now be described more in detail with the aid of preferred embodiments- in connection with the enclosed drawings ..

BRIEF DESCRI IO OF THE BRAWISSS

Figure 1 belongs to the prior art and d scloses a block schematic illustratio showing delivering of HTTP streams made out of HTTP chunks from a P2P live streaming network to a P2P client.

Figure 2 belongs to the prior art and discloses a block schematic illustration of enhanced Multimedia Broadcast and Multicast Services eMBMS functions using eMBMS interfaces.

Figure 3 belongs to the prior art and discloses a signalling sequence diagram showing Multimedia Broadcast and Mul icast Services Session start,, preparatio and notification.

Figure 4 discloses a block schematic illustration of a solution overview focusing on sending P2P live streaming in a non-P2P way by putting together via a converter node, a Multicast Server in an access network with a P2P live st.reaming network. Figure 5 discloses in a signalling sequence diagram a method of sending of P2P live streaming in a n.on~P2P way by using multicasting .

Figure 6 discloses a block schematic illustration of a converter node .

Figure 7 discloses a block schematic illustration of a Client .

In the following description, for purposes of explanation and not limi ation, .specific details are set forth, such as. particular circuits, circuit, components., techniques, etc.. in order to provide a thorough understanding of the present embodiments.. However, it will be apparent to one skilled in the art that the present examples xnay be practiced in other embodiments that depart from these specific details. .In other instances, detailed descriptions of well known methods, devices, and circuits are omitted so as not to obscure the description of the present embodiments with unnecessary detail.

While P2P works very well over the Internet it is not desirable insid an operator's access network wherein multicast would be to prefer. Figure 2 belongs to the prior art and discloses an enhanced Multicast Broadcast Media Server ©MBMS 20, also called a multicast server 20. The figure shows eMBMS functions using eMBMS interfaces . Multimedia Broadcast and Multicast services MBMS is a broadcasting service offered via cellular networks. Enhanced MBMS (eMBMS). is used to denominate MBMS service in Evolved Packet Systems including E-UTRAN (LTE) and UTRAN access. The eMBMS comprises a Broadcast Multicast Service Centre BMSC 21. The BMSC is a 3GPP specified solution for Multicasting in 3G networks. The BMSC is responsible fo triggering multicast inside the operator's network 30. The stream will come from the content source 22 i.e. for example from an internet server. The BMSC handles MBMS sessions and is responsible to deliver user plane media to a M3MS-GW 23. The MBMS-GW provides functionality for sending/broadcasting of MBMS packets to each eNB 25 transmitting the service. The MME 24 provides Session Control of MBMS bearers to. the E-UT AN access. The stream will be fed into the BMSC that will forward the stream into the operator's network 30 i a multicast way. See e.g. document GVP TS^' 25.3 6.: or the reference design ΒΆΒ- 11:04574 ue for a more detailed description. Figure 3 belongs to prior art and discloses ah overview of the eMBMS session, establishment. The figure discloses the UE. 16, the eMBMS 20 comprising the eNB 25, the MBMS-GW 23 and the BMSC 21. Upon receiving a triggering signal 7.9 the BMSC sends a Session Start Request, signal 80A to_: the MBMS-GW. The MBMS- GW forwards the Session- Start Request signal S^'G& to th eNB^' :25 via the MME 24 {not in figure 3") . The eKB, ME^' and MBMS-G respond with a Session Start Response message 80B to the BMSC. The described signalling sequence is called MBMS Session Start 8;0. Resources in the access network needs to be reserved for the MBMS broadcast well in. time before a MBMS transmission. It is assumed that the configured Admission control 8lA limits in the eNB are set in such a way that the MBMS sessions can be started on time and resources are allocated 8IB for transmission. This signalling is in the figure called 81: MBMB Transmission Preparation. The client UE will get a notification 82A that consists of a direction to a multicast socket that the user equipment should listen to. The messages 82A and 82B will ensure that the user equipment knows on what socket to listen to i.e. the messages work like an implicit join. This signalling is in the figure called 82: MBMS Notification. The multicast notification comes in the information about which channels are available. When the UE gets that information it opens a socket. In other words, the server announces that there is a channel open and the UE opens the socket as soon as the data starts coming. See e.g. document 3GPP TS 25.346 or the reference design SAB- 11:045744 lien for a more detailed description of the session es ablishmen . The embodiments that now will be discussed are applicable for both MBMS and eMBMS in order to cover both 3G and LTE cases .

Figure. 4 discloses a solution overview of the embodiments._, that below will be discussed more in detail. The solution overview shows £2View peers 13-15 in the internet 12. The figure further discloses P2P clients 16-19 i an access network 30. An Origin Server 10 and a server 11 in a Content Distributio He wqrk CD is shown, in figure 4. The servers 10-11 nd the peers 13-15 are in this example in possession HTTP streams .made out of HTTP chunks 1-6. In this example, three P2-P clients 17-19 out of the four clients 16-19 are viewing the same live stream channel and are in possession of chunks 1,2/3, The^' chunks 1,2,3 each one has been fetched, in this example from the origin server 10, the CBN server II and peer 15 respec ively. The fetching of chunks has been done in accordance to prior art. According to the embodiment , the Internet 12 and the access network. 30 are joined together via a converter node {Mobile Cloud Accelerator Peer to Peer) MCAP2P 49 and an enhanced Multicast Broadcast Media Server eMBMS 30. The eMBMS has been explained above and the converter node will be further discussed below.

Figure 5 discloses in a first embodiment a method of sending P2View streaming in a non-P2 way by using multicasting. Figure 5 discloses the P2P client 16, a Channel list server 71, the eMBMS 20, the converter node MCAP2P 40, a Tracker 70 and a Peer IS in the Internet. Th Channel list server 71 comprises a list of available live stream channels that clients may want to use. The Tracker 70 selects set of e r's to download data chunks from. The Tracker functions as a gateway between peers in the P2P network. In P2P systems based on Tracker architecture when a client requests content, it contacts the Tracker in order to obtain addresses of peers having the desired data chunks. The Tracker replies with a list of addresses to peers haying the data. The method of using mul icasting instead of_. using P2P- for chunk transportation if peers in. the access network are viewing the same channel and if the number of the peers i above a threshold value will now be explained. A prerequisite in this example is that th P2P clients 17-19 in the access network are viewing the. same live stream (see figure 4) . The method according to the first- .embodiment comprises the following steps:

- A threshold value for .number of peers viewing the same channel is set 50 in the converter node 40. in this example the^' threshold value has been set to ".four" . .As. said, three P-2-P clients 17-19 are already viewing the same live stream.

- The signalling tha will be discussed in this paragraph is part of the prior" art. The P2P client 16 enters the system and joins 51 the P2View network and the client starts to ask 52 for existing video stream channels. The client hereby contacts the channel list server 71 and the server returns back S3 a list of channels. The client makes a selection of a desired channel which is the same channel as the clients 17-19 are viewing. he client 16 contacts 55 the Tracker 70 in the Internet network. The Tracker knows of ail the peers 13-15 in the Internet in possession of required chunks tha are part of the requested channel and also 1.0 has knowledge of the C.DN server 11 and the origin server 10. The Tracker sends a Tracker response 56 back to the client 16. The response includes a list of peers (usually IP addresses) already watching the channel. The P2P client performs .measurements, e.g. by- using a BART method for available bandwidth estimation, between all replied peers to see which peer is the most appropriate to ask for a needed chunk. In this example the most appropriate peer to ask for the chunk is among the 52 iew peers in the internet but also the servers 10 or 11 may be considered... The client asks, for a list of chunks from the peer 15 in the Internet in possession of the chunks relating to the selected live stream channel by sending a chunk list, request 37 to. that peer.. The request comprises channel information.

According to the first embodiment the chunk list request 57 is intercepted 58 in the converter node 40 regarding the channel information.

The number of peers (now including the new peer 16) using the same channel is compared 59 to the threshold value. The number is four and the threshold value "four* is found to have been reached.

Mode switchin (in all peers 16-1S viewing the same channel) from P2P to multicast is initiated 61 in the converter node 40.

A mode switch message is sent 63 from a Media Converter 42 {see figure 6} in the converter node 40 to the eMBMS 20. The mode switch message corresponds to the triggering message 79 earlier disclosed in figure 3. - The eMBMS starts the MBMS session 80 as earlier explained in igure 3.

- The eMBMS performs MBMS Transmission preparation 81 as earlier explained in figure 3.

- The eMBMS performs MBMS Notification 82 as explained in figure 3. This result in signalling from eMBMS to the client as explained earlier in figure 3 by the signalling 82A and 82B. This is disclosed by bearer, info message 83 in. figure 5. Fqr simplicity reasons only one client, is referred to in figure 5. but the signalling is. sen to all clients 16-19 using the channel. Bearer information is extracted by the client from the message 83 This information is used by the client to .know what multicast bearer to join.

- A. Switch message 62 is sent from a P2P to multicasting switch 43 {see figure 6) in the converte node 40 to the client 16 and upon receiving the message a MBMS socket is opened 64 and a P2P stream client is_. stopped 65 in the client 16.

- The converter node 40 activates 60 the converting, of chunks from P2P format into multicast MSBM format. Converting from P2P format into multicast format e.g. BASH or HLS over MBMS download, belongs to prior art.

- MBMS data broadcast is fed 66 from 43 in the converter node 40 via the BMSC 21 to the client 16.

- Chunks are fed 68 in the client IS from the MBMS socket to a video client.

Figure 6 discloses a block schematic illustration of a converter node 40, in this embodiment also called, a Mobile Cloud Accelerator Peer to Peer MCAP2P 40. Figure 6 discloses the MCAP2P architect-are. The converter node comprises a Media converter 42, a P.2P to multicas ing switch 43 and an interception unit 44. The MCAP2P module further comprises a virtual!zation layer 41 upon which it is possible to deploy and instantiate different P2P protocols depending on the protocols used by the terminals. The Virtualization layer 41 permits shared hardware recourses and different applications 4<8a-c to be run b the hardware resources . P2P¥ie , Bittorent and P2PLive for example represent server software that can be placed on top of the Virtualization layer and be run b hardware. In this example a P2view application 48a has been placed on top of the Virtualization; layer and the MCAP2P in this example acts as a standard P2Vie client. The Media Converter 42 converts. HTTP chunk from: P2View format into multicast fox-mat. The switch 43 initiates the eMBMS to prepare and notify user equipment to receive multicast streaming. The interception unit 44 comprises a Deep Packet Inspection module that is able to extract i_.nformation from a passing message. The interception unit comprises in this example a data base 45; in which a threshold value T for number of clients using/ iewing same channel is stored. Figure 6 further discloses the client 16 that is attached via interfaces to the switch 43 and the interception unit 44 in the converter. The user equipment is further attached via the BMSC 21 to the Media Converter 42. The Tracker 70 is attached via an interface to the interception unit 44. Internet 12 is attached via interfaces to the converter node 40, to the Tracker 70 and to the client 16. After reached threshold T, a. trigger is sent from the interception unit 44 to the switch 43 that sends the mode switch message 62 (see figure 5) to the client 16 in order to switch mode. Chunks are received to the P2View application 48a from Peer2view Peers 13-15 in possession of required chunks in. the Internet. Chunks belonging to a selected channel are sent from Internet to the P2View application 48 . The received chunks in P2view format are forwarded to the Media Converter 42 and converted to Multimedia Broadcast and Multicast services MBMS format and sent in Multicast format to the BMSC 21 in the eMBMS 20. Chunks are then streamed from the BMSC in the eMBMS to the client 16 in a Multicast way.

Figure- 7 discloses a block schematic illustration of a Client. The figur^'e -discloses_. the User Equipment architecture. A Peer2View (P2P streaming) client 90 comprising MCAP2P module 91 is. seen in the figure. The MCAP2P module will receive the switch message 62 that were explained in figure 5. Ά video rendering application 92 will receive chunks from a Live stream source 94 eithe from the P2View system 93 or after- the threshold has been, reached from the multicast system via the MGAP2P 40. An eMBMS client ^•96 receives the MBMS notificatio 82 (see figure 5} via the eMBMS 20 whereby TGMI will be extracted- After the mode switch message 62 (see figure 5) from MCAP2P 40 an MBMS socket, in the eMBMS client will be opened and the client 90 will be stopped, in case of a reached threshold_f chunks will be received from the opened MBMS socket and forwarded in the client to the Video rendering application 92.

System and nodes that can be used to put the invention into practice is schematically shown in the figures. .Enumerated items are shown in the figures as individual elements. In actual implementations -of the invention, however, they may be inseparable components of other electronic devices such as a digital computer. Thus, actions described above may be implemented in software that may be embodied in an article of manufacture that includes a program storage medium. The program storage medium includes data signal embodied in one or more of a carrier wave, a computer disk (magnetic, or optical {e.g., CD or DVD, or both), non-volatile memory, tape, a system memory, and a computer hard drive.

The systems and methods of the present invention may be implemented for example on any of the Third Generation Partnership Project ( 3GP2?) , European Telecommunications Standards Institute { ETS ) , American National Standards Institute (ANSI) , Long Term. Evolution (LTE) or other standard telecommunication network architecture. Other examples are the Institute of Electrical and Electronics Engineers (IEEE) or The Internet Engineering Task Force (IETF) .

The description, for purposes of explanation and not limitation, sets forth specific details, such as particular components, electronic circuitry, techniques, etc., in order to provide an understanding of the present invention. But it will be apparent to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known methods, devices, and -techniques, etc., are omitted so as not to obscure the description wit unnecessary detail . Individual function blocks are shown in one ox" more figures. Those skilled in the art will appreciate that functions may be implemented using discrete components or multi-function hardware. Processing functions may be implemented using a programmed microprocessor or general-purpose computer. The invention is not limited to the above described and in the drawings shown embodiments but can be modified within the scope of the enclosed claims.

Claims

A method to optimize load transportation between a P2P live streaming network ( 12) and an access network (305 the method comprising:

- selecting by a pee (16) in the access network live channel to use;

·- sending a request (57) comprising information of the selected channel from the access network to the streaming network; c h a r a c t e r i z e d in:

- detecting in a converter node (40) connecting the P2P live streaming network .and. th access network, that number of peers {16-3.9} in the access network using the selected. channel has reached a predetermined threshold value (a?) ;

- converting in the converter node .{40} chunks: that, are parts of the selected channel, arriving; from peers (13-15.) in the streaming network,- from P2.P format to multicast forma ,

e method to optimize load transportation according claim 1, further including: initiating mode switching by sending a mode switch message ( 63 ! from the converter node (40) to a The method to optimize load transportation according to any of claims 1-2, further including:

- initiating (62) by the converter node {40} detected peers to switch from P2P mode to multicast mode.

The method to optimize load transportation according to claim 3, further including:

- forwarding converted chunks from the converter node (40) to the multicast server (20)

- forwarding (66) converted chunks: .i a multicast way from the multicast server (20) to the detected peers {16-19} .

The method to optimize load transportation according to any of claims 3-4, further including:

- extracting in the detected peers (XS-IS bearer information from a bearer info message (83} received from the multicast server (20) ^■

- receiving to the detected peers a switch message (62) from the converter node (40)

- opening in the detected peers a multicast socket

- stopping in the detected peers a P2P stream client .

6. The method to optimize load transpo tation according to claim 5, further including: feeding a channel stream received to a detected peer from the socket to a video client.

: method to optimize load transportation according any of the previous claims, further including: intercepting (58} the request (5?) in the converter node {40) .

The method to optimize load transportation according to claim 7 whereby- the request (57) is intercepted (58) i the converter node (40) by using Deep Packet Inspection.

A computer program product comprising computer program code, wherein the computer program comprises code adapted to perform the method of one or more of the claims 1-8, when the computer program code is executed in a processor.

A network node (40) of a telecpiamunication network configured to optimize load transportation, said node comprising:

- means (44) for intercepting signalling transmitted from peers (16-19) in an access network (30) to a P2P live streaming network (12)

- means (44, 45) fox- detecting reaching of a threshold value corresponding to number of peers in the access network (.30) using a selected channel means {42} for converting chunks received from peers (13-15) in the P2P live streaming network (12) from P2P format to multicast format.

11. The network node (40} of claim 10, said node further comprising :

·^■■ means (42) to initiate mode switching by sending a mode switch message {63} to a multicast server (20) .

The network node (40} of claim 11, said node further comprising :

- means {43} to send a Switch message 62 to detected peers {16-10) in the access network (30) to influence the peers to swi ch, from P2P mode to mul icas mode.

13. The network node (40) of claim 12, said node further comprising:

- means {43} for forwarding converted chunks to the multicast server {20}

14. The network node {40} according to any of claims 10- 13, said node further comprising:

- means {455 to store the threshold value (T) .

15. The network node (40) according to any of claims 10- 14, said node further comprising:

- a visualization layer deploying and instantiating different protocols depending on the protocols used by attached terminals .

16. A terminal node (16.) of a telecommunication network, said node comprising; - means fo extracting bearer Information received from a multicast server (20

- means for receiving a switch message (62) initiating, receiving of multicast strearning

- means for opening a multicast socket; - means for stopping a P2p streaming client C9G) .

The terminal node (IS) of a telecommunication network, according to claim 16, said node further comprising;

- means for playing out received multicast streaming media ,