WO2015143674A1

WO2015143674A1 - Video transmission method, apparatus and system

Info

Publication number: WO2015143674A1
Application number: PCT/CN2014/074217
Authority: WO
Inventors: 史嫄嫄; 夏海涛; 乔伟华
Original assignee: 华为技术有限公司
Priority date: 2014-03-27
Filing date: 2014-03-27
Publication date: 2015-10-01
Also published as: CN105144730B; CN105144730A

Abstract

The present invention provides a video transmission method, apparatus and system. The method comprises: a server receives video request information sent by a user equipment (UE), the video request information comprising a UE identifier; the server obtains first load information of a network where the UE is located according to the UE identifier; the server generates a first media segment with a first bit rate and a first media presentation description (MPD) file corresponding to the first segment, the first bit rate matching the first load information; the server sends the first MPD to the UE, so that the UE obtains the first bit rate according to the first MPD; and the server receives segment request information sent by the UE, the segment request information comprising the first bit rate, and sends the first segment to the UE according to the first bit rate. In the present invention, a server prepares media according to real-time load informant of a network where a user is located, so that a media stream is highly matched with the real-time network load information of the user.

Description

Technical field

The present invention relates to communication technologies, and in particular, to a video transmission method, apparatus, and system.

Background technique

3GP-DASH (3GP-Dynamic Adaptive Streaming over HTTP) is a protocol proposed by The 3rd Generation Partnership Project (3GPP) to enable streaming media to play smoothly when bandwidth fluctuations are large. Figure 1 shows the architecture of the 3GP-DASH system. As shown in Figure 1, the 3GP-DASH system includes: 3GP-DASH HTTP server and 3GP-DASH client, or also includes an HTTP buffer unit. The HTTP server includes a 3GP-DASH content preparation module, a 3GP-DASH media presentation description (MPD) file distribution function module, and a 3GP-DASH media segment distribution function module.

In the prior art, in the case of a live video service (Live Service), a hypertext transfer protocol

(Hypertext Transfer Protocol, abbreviation: HTTP) The 3GP-DASH content preparation module of the server is based on the specified bit rate of the source media stream provider when the source media stream is input, usually in megabits per second (Megabits Per Second, Mbps for short). ), for example, 20Mbps, 50Mbps, 100Mbps, is fixed, encodes the source media stream content at different quality levels, generates media versions of different bitrates, and cuts the media content of these different bitrates. The slice file is generated and the corresponding MPD file is generated. The MPD file provides the client with detailed description information of the segment, including the code rate, the resolution, the Uniform Resource Locator (URL) address, and the length of the segment. Then, according to the video live broadcast request of the client, the MPD file distribution function module sends the MPD file to the client, so that the client obtains the media resource list according to the MPD file, and selects a matching bit rate from the current channel available bandwidth state and the channel state. Segment, after segmen The t distribution function module sends the segment selected by the client to the client.

However, for mobile networks, the user's available bandwidth fluctuates greatly. The existing 3GP-DASH video transmission technology, the HTTP server provides several fixed bit rates to the user's client, which is easy to exist even if The media stream that the user selects the minimum bit rate still has a problem that the playback is not smooth.

Summary of the invention

In view of this, an embodiment of the present invention provides a video transmission method, apparatus, and system.

In a first aspect, an embodiment of the present invention provides a video transmission method, including:

The server receives the video request information sent by the user equipment UE, where the video request information includes the UE identifier;

The server acquires first load information of the network where the UE is located according to the identifier of the UE; the server generates a first media fragment segment having a first code rate, and a first media representation description corresponding to the first segment File MPD, the first code rate is matched with the first load information;

Sending, by the server, the first MPD to the UE, so that the UE acquires the first code rate according to the first MPD;

The server receives the fragmentation request information sent by the UE, where the fragmentation request information includes the first code rate, and sends the first segment to the UE according to the first code rate.

In a first possible implementation manner of the first aspect, after the server sends the first MPD file to the UE, the method further includes:

The server acquires second load information of the network where the UE is located according to the UE identifier; the server generates a second segment with a second code rate and a second MPD corresponding to the second segment, where the second The code rate matches the second load information;

And the sending, by the server, the first segment to the UE according to the first code rate, where: the server sends the first segment and the second MPD to the UE, so that the UE receives the Determining the first segment and acquiring the second code rate according to the second MPD.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the server, according to the UE identifier, acquiring the first load information of the network where the UE is located, includes:

The server sends first load request information to the policy control unit, where the first load request information includes the UE identifier;

Receiving, by the server, first load information sent by the policy control unit;

Obtaining, by the server, the second load information of the network where the UE is located according to the identifier of the UE, where Includes:

The server sends the second load request information to the policy control unit, where the second load request information includes the UE identifier; or the server sends a message that the first MPD completes sending to the policy control unit, And causing the policy control unit to acquire the second load information according to the UE identifier;

The server receives second load information sent by the policy control unit.

In conjunction with the first possible implementation of the first aspect, in a third possible implementation manner of the first aspect, the server generates a first media fragment segment having a first code rate, and the first segment After the corresponding first media representation description file MPD, the method further includes:

The server sends the first segment and the first MPD to a cache unit;

After the server generates the second segment having the second code rate and the second MPD corresponding to the second segment, the server further includes:

Sending, by the server, the second segment and the second MPD to the cache unit; the sending, by the server, the first MPD to the UE, including:

Sending, by the cache unit, the first MPD to the UE by using the buffer unit;

And sending, by the server, the first segment and the second MPD to the UE, the server includes: sending, by the server, the first segment and the second MPD to the UE by using the buffer unit.

With reference to the third possible implementation manner of the foregoing aspect, in a fourth possible implementation manner of the foregoing aspect, the server, according to the UE identifier, acquiring the first load information of the network where the UE is located, includes:

The server acquires second load information of the network where the UE is located according to the UE identifier, and includes:

The server receives the second load information sent by the policy control unit, where the second load information is determined by the policy control unit, after the buffer unit finishes receiving the first MPD, according to the UE identifier. .

In a second aspect, an embodiment of the present invention provides a video transmission method, including: The policy control unit receives the first load request information sent by the server, where the first load request information includes the UE identifier of the user equipment UE that sends the video information;

The policy control unit acquires first load information of the network where the UE is located according to the UE identifier, and sends the first load information to the server.

In a first possible implementation manner of the second aspect, after the sending, by the policy control unit, the first load information to the server, the method further includes:

The policy control unit receives the second load request information sent by the server, where the second load request information includes the UE identifier, or receives a message that the first MPD sent by the server completes the sending;

The policy control unit acquires the second load information according to the UE identifier;

The policy control unit sends second load information to the server.

In a second possible implementation manner of the second aspect, after the sending, by the policy control unit, the first load information to the server, the method further includes:

If the policy control unit determines that the buffer unit completes receiving the first MPD, acquiring the second load information according to the UE identifier;

The policy control unit sends second load information to the server.

In a third aspect, an embodiment of the present invention provides a video transmission apparatus, including:

The transceiver module is configured to receive video request information sent by the user equipment UE, where the video request information includes a UE identifier;

An acquiring module, configured to acquire first load information of a network where the UE is located according to the UE identifier, and a media preparation module, configured to generate a first media fragment segment having a first code rate and corresponding to the first segment The first media represents a description file MPD, and the first code rate matches the first load information;

The transceiver module is further configured to send the first MPD to the UE, so that the UE acquires the first code rate according to the first MPD;

The transceiver module is further configured to receive the fragmentation request information sent by the UE, where the fragmentation request information includes the first code rate, and send the first to the UE according to the first code rate. Segment.

In a first possible implementation manner of the third aspect, the acquiring module, after the sending and receiving module sends the first MPD file to the UE, is further configured to: Acquiring the second load information of the network where the UE is located according to the UE identifier; the media preparation module is further configured to generate a second segment with a second code rate and a second MPD corresponding to the second segment, where The second code rate is matched with the second load information; the transceiver module is specifically configured to:

Transmitting the first segment and the second MPD to the UE, so that the UE receives the first segment, and acquiring the second code rate according to the second MPD.

With reference to the first possible implementation manner of the third aspect, in the second possible implementation manner of the third aspect, the acquiring module is specifically configured to:

Sending, to the policy control unit, first load request information, where the first load request information includes the UE identifier;

Receiving first load information sent by the policy control unit;

Sending, to the policy control unit, second load request information, where the second load request information includes the UE identifier; or sending a message that the first MPD completes sending to the policy control unit, so that the policy control unit Obtaining the second load information according to the UE identifier;

Receiving second load information sent by the policy control unit.

In conjunction with the first possible implementation of the third aspect, in a third possible implementation of the third aspect, the method further includes: a cache module, configured to:

After the media preparation module generates a first media fragment segment having a first code rate and a first media presentation description file MPD corresponding to the first segment, sending the first segment and the first to the buffer unit. An MPD;

After the media preparation module generates a second segment having a second code rate and a second MPD corresponding to the second segment, sending the second segment and the second MPD to the buffer unit;

The transceiver module is specifically configured to:

Transmitting, by the buffer unit, the first MPD to the UE; and sending, by the buffer unit, the first segment and the second MPD to the UE.

In conjunction with the third possible implementation of the third aspect, in a fourth possible implementation manner of the third aspect, the acquiring module is specifically configured to:

Sending, to the policy control unit, first load request information, where the first load request information includes the UE identifier; Receiving first load information sent by the policy control unit;

Receiving second load information sent by the policy control unit, where the second load information is determined by the policy control unit after the buffer unit finishes receiving the first MPD, according to the

Obtained by the UE identifier.

In a fourth aspect, an embodiment of the present invention provides a video transmission apparatus, including:

a request receiving module, configured to receive first load request information sent by the server, where the first load request information includes a UE identifier of the user equipment UE that sends the video information;

a load acquisition module, configured to acquire, according to the UE identifier, a first load I of the network where the UE is located,

And a load sending module, configured to send the first load information to the server.

In a first possible implementation manner of the fourth aspect, the request receiving module is further configured to: after the load carrying module sends the first load information to the server:

Receiving, by the server, the second load request information, where the second load request information includes the UE identifier; or receiving a message that the first MPD sent by the server completes sending; the load obtaining module is further used to: Acquiring the second load information according to the UE identifier; the load sending module is further configured to send second load information to the server.

In a second possible implementation manner of the fourth aspect, the load acquiring module is further configured to: after the load sending module sends the first load information to the server,

If it is determined that the buffer unit finishes receiving the first MPD, acquiring the second load information according to the UE identifier;

The load sending module is further configured to send second load information to the server.

According to a fifth aspect, an embodiment of the present invention provides a server, including: a first processor, and a first memory connected to the first processor, where the first memory is configured to store load information, a media slice segment, and a media representation description file MPD corresponding to the media fragment segment, and a set of program codes, the first processor may execute the program code to implement the first to fourth aspects of the first aspect and the first aspect A step in the video transmission method of any of the possible implementations.

According to a sixth aspect, an embodiment of the present invention provides a policy control unit, including: a second processor, and a second memory connected to the second processor, where the second memory is configured to store load information, and a set of program codes The second processor can execute the program code to implement the second party And a step in the video transmission method according to any one of the first to second possible implementations of the second aspect.

The seventh aspect of the present invention provides a video transmission system, comprising: the server according to the fifth aspect, the policy control unit and the user equipment UE client according to the sixth aspect; or, including: The server of the aspect, the policy control unit according to the sixth aspect, the cache unit and the user equipment UE client.

In this embodiment, the server obtains real-time load information of the network where the user is located according to the user video request, and performs content preparation according to the real-time load information, and generates a segment matching the real-time load information with a code rate, so that the user can select The segment matching the code rate of the network load information achieves a high matching between the media stream and the real-time network load information of the user, and fully utilizes the real-time network bandwidth of the UE; and actively pushes the next segment by sending a segment to the user. The corresponding MPD file can reduce the network overhead caused by the user actively pulling the MPD file.

BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some implementations of the present invention. For example, other drawings may be obtained from those skilled in the art without any inventive labor.

Figure 1 is a schematic diagram of a 3GP-DASH system architecture;

2 is a flowchart of Embodiment 1 of a video transmission method according to the present invention;

FIG. 3 is a flowchart of Embodiment 2 of a video transmission method according to the present invention;

4 is a flowchart of Embodiment 3 of a video transmission method according to the present invention;

FIG. 5 is a signaling flowchart of Embodiment 4 of a video transmission method according to the present invention;

6 is a signaling flowchart of Embodiment 5 of a video transmission method according to the present invention;

FIG. 7 is a schematic structural diagram of Embodiment 1 of a video transmission apparatus according to the present invention;

FIG. 8 is a schematic structural diagram of Embodiment 2 of a video transmission apparatus according to the present invention;

9 is a schematic structural diagram of an embodiment of a server provided by the present invention;

10 is a schematic structural diagram of an embodiment of a policy control unit provided by the present invention;

FIG. 11 is a schematic structural diagram of Embodiment 1 of a video transmission system according to the present invention; FIG. 12 is a schematic structural diagram of Embodiment 2 of a video transmission system according to the present invention.

The present invention will be described in detail with reference to the accompanying drawings, in which All embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

In the prior art, the DASH video transmission scheme generates a segment with a fixed bit rate and an MPD corresponding to the segment for the source media stream according to several fixed bit rates specified by the video provider during video transmission, and includes the designation in the MPD. Several fixed bitrates are available for the client to choose. However, for the live video service, the user's mobility is very large, and the number of users in different time periods is also very different, so that the user's network bandwidth and the like are relatively volatile, and the existing DASH video transmission scheme is used to generate a fixed code in advance. The segment of the rate has a large delay, and can only provide a few fixed bit rate segments. There may be a problem that the number of users is not smooth when the number of users is large, and the effective network bandwidth of the user cannot be fully utilized when the number of users is small.

FIG. 2 is a flowchart of Embodiment 1 of a video transmission method according to the present invention. As shown in FIG. 2, the method embodiment includes the following steps:

Step 201: The server receives the video request information sent by the user equipment UE, where the video request information includes a UE identifier, where the server may be an HTTP server, and may be used to provide a video live broadcast service to the UE client.

Step 202: The server acquires first load information of a network where the UE is located according to the UE identifier.

The UE identifier includes, but is not limited to, International Mobile Subscriber Identity (IMSI), International Mobile Equipment Identity (IMEI), and Mobile International Integrated Services Digital Network (Integrated). Services Digital Network, referred to as: ISDN) number (Mobile Station international ISDN number, referred to as: MSISDN).

The load information in the embodiment of the present invention includes the base station side load information and/or the core network side load information of the network where the UE is located, where the load information of the base station side may include, but is not limited to: the number of users connected to the base station side, the base station The amount of traffic currently served, the available bandwidth information on the base station side, The usage of the physical resource block (Physical Resource Block, PRB for short); the load information of the core network side, which may include but is not limited to: the current actual number of users on the network, that is, the sum of the number of users on all base stations connected to it. The sum of the traffic of all base station services currently connected to the network, the processing power of the core network, and the storage capacity. The first load information may include first base station load information and/or first core network load information. When the base station cell served by the core network has uneven load between cells and the resource utilization is unbalanced, if there are fewer users in the cell and the load is light, and some users in the cell have more users and the load is heavy, Since all the user's service data packets need to be processed through the core network (such as quality of service QoS control, policy and charging, routing, and data forwarding, etc.), in order to better improve the utilization of the radio resources of the base station side, In addition, the processing efficiency of the core network is improved, and the core network load information can be considered while considering the load information on the base station side.

Step 203: The server generates a first media fragment segment having a first code rate and a first media representation description file MPD corresponding to the first segment, where the first code rate matches the first load information.

The first code rate matches the first load information, and the code rate value of the first code rate matches the current network load information of the user, and the first code is compared with the fixed code rate value in the prior art. The rate may have a higher rate value than the highest fixed rate value, or may have a lower rate value than the lowest fixed rate value. If the current number of users is large, the network load is large, the available bandwidth is small, and the segment generated by the server has a first code rate with a lower bit rate value. For example, the lowest fixed bit rate value in the prior art is 20 Mbps. The code rate of the first bit rate may be 10 Mbps, so that the current user can smoothly play the video; if the current number of users is small, the network load is small, the available bandwidth is large, and the segment generated by the server has a higher bit rate value. The first code rate, for example, in the prior art, the highest fixed code rate is 100 Mbps, and the code rate value of the first code rate may be 120 Mbps, so as to fully utilize the current network bandwidth of the user, so that the current user can enjoy smoother, A higher quality live video.

It should be noted that, for multiple users, the server may determine a maximum code rate value of the first code rate that matches the minimum first load information according to the first load information of all users, and determine the highest first load therein. The minimum code rate value of the first code rate matched by the information, for the first load information having the intermediate value, may be statistically classified to determine the intermediate code rate of the first code rate that matches the first load information of different classes For example, the intermediate value of the first load information may be divided into 8 categories according to the small arrival and large, and the server accordingly generates a first segment having 8 different intermediate code rate values, and the specific statistical classification, the present invention Not limited. Step 204: The server sends a first MPD to the UE, so that the UE acquires the first code rate according to the first MPD.

The first MPD includes a first code rate set consisting of a maximum code rate value of the first code rate, a minimum code rate value of the first code rate, and a plurality of intermediate code rate values of the first code rate, so that the first code rate set is different. The UE may obtain, from the first code rate set, a first code rate having a code rate value that most closely matches the first load information of the UE.

Step 205: The server receives the fragmentation request information sent by the UE, where the fragmentation request information includes a first code rate, and sends the first segment to the UE according to the first code rate.

If the first code rate included in the fragmentation request information is the minimum value of the first code rate, the first segment having the smallest code rate value is sent to the UE according to the minimum value of the first code rate.

Preferably, after the server sends the first MPD file to the UE, the method further includes: obtaining, by the server, the second load information of the network where the UE is located according to the UE identifier;

The server generates a second segment having a second code rate and a second MPD corresponding to the second segment, where the second code rate matches the second load information;

The server sends the first segment to the UE according to the first code rate, including:

The server sends the first segment and the second MPD to the UE, so that the UE receives the first segment, and acquires the second code rate according to the second MPD.

Further, in step 202, the server obtains the first load information of the network where the UE is located according to the UE identifier, and the method includes: the server sends the first load request information to the policy control unit, where the first load request information includes the UE identifier, where the policy control The unit may be, but is not limited to, an existing Policy and Charging Rule Function (PCRF) located on the core network side; the server receives the first load information sent by the policy control unit, and Acquiring the first load information in a load information,

The server obtains the second load information, including two modes: First, the server adopts a step similar to acquiring the first load information, by sending the second load request information to the policy control unit, and receiving the second sent by the policy control unit. The load information is not described in detail. The second type is that the server sends a message that the first MPD completes the sending to the policy control unit, so that the policy control unit determines that the first load information is invalid after determining that the first MPD has been sent, according to the UE. The identifier acquires the second load information, and returns the second load information to the server, where the server receives the second load information sent by the policy control unit. It should be noted that the present invention may be generated in addition to real-time server load information of the network where the UE has a rate matching _se g _men t, but may also have a matching length information generator according to real time load, resolution and the number of segment code stream , or a segment that matches the above parameters, which is not limited by the present invention.

Specifically, the server obtains the first load information of the current access network of the UE by using the policy control unit, after receiving the video broadcast request of the UE, after receiving the video play request of the UE, where the first load information includes the load on the base station side. Information and/or core network side load information, generating a first segment having a first code rate matching the first load information, and transmitting a first MPD file corresponding to the segment to the user, so that the user can be from the first MPD Obtain a code rate that matches its current network load information, and send a media fragmentation request to the server. After the first MPD is sent, the server acquires second load information according to the UE identifier, to generate a second segment of the second code rate that matches the second load information, and a corresponding second MPD, and sends the first segment to the UE. At the same time, the second MPD is sent, so that the user obtains the second code rate according to the second MPD, and sends the request information of the second segment, and so on, while sending the segment to the UE, and actively pushing the message while buffering the first segment. The MPD file corresponding to a segment, until the video playback ends, or the UE actively suspends the video request.

In the prior art, the DASH video transmission technology acquires the latest suitable video content based on the active pull of the user client. For the live video service with the parameter MPD minimum update period (minimumUpdatePeriodMPD), the client takes an active control policy, continuously pulls and checks the update of the MPD file periodically to request information about the new media fragment according to its channel state request. . However, this kind of information acquisition based on the client-driven mode, the client frequently pulls the MPD file to the server and performs local check and update, and there is a problem of air interface interaction, and excessive air interface interaction is easy to bring delay, Will increase network overhead.

In this embodiment, the server obtains real-time load information of the network where the user is located according to the user video request, and performs content preparation according to the real-time load information, and generates a segment matching the real-time load information with a code rate, so that the user can select The segment matching the code rate of the network load information achieves a high matching between the media stream and the real-time network load information of the user, and fully utilizes the real-time network bandwidth of the UE; and actively pushes the next segment by sending a segment to the user. The corresponding MPD file can reduce the network overhead caused by the user actively pulling the MPD file. FIG. 3 is a flowchart of a second embodiment of a video transmission method according to the present invention. The method is an embodiment of the method shown in FIG. 2. The server sends a segment of the segment and the MPD to the UE by using a buffer unit located on the core network side. A preferred embodiment, wherein the cache unit includes but is not limited to a Content Delivery Network (CDN) cache unit. As shown in FIG. 3, the method embodiment includes the following steps:

Step 301: After generating the first media segment segment having the first code rate and the first media presentation profile MPD corresponding to the first segment, the server sends the first segment and the first MPD to the buffer unit.

Step 302: The server sends a first MPD to the UE by using a buffer unit.

Step 303: After generating the second segment having the second code rate and the second MPD corresponding to the second segment, the server sends the second segment and the second MPD to the buffer unit.

Step 304: The server sends the first segment and the second MPD to the UE by using a buffer unit. Further, in this embodiment, the process of obtaining the first load information by the server is the same as that in the method embodiment shown in FIG. 2, and details are not described herein again.

The server obtains the second load information of the network where the UE is located according to the UE identifier, and includes:

The server receives the second load information sent by the policy control unit, where the second load information is obtained by the policy control unit according to the UE identifier after the buffer unit finishes receiving the first MPD.

Specifically, when the server sends the MPD and the segment to the UE by using the buffer unit, after determining that the buffer unit completes receiving the first MPD, the policy control unit actively acquires the next load information of the network where the UE is located, that is, the second load, according to the UE identifier. Information, and actively reporting the load information to the server, so that the server generates a second segment having a second code rate and a corresponding second MPD according to the load information, where the policy control unit determines a manner in which the cache unit completes receiving the first MPD, including However, the method is not limited to: the first type, the policy control unit detects the receiving state of the buffer unit, and when it is detected that the buffer unit has received the first MPD file, determines that the buffer unit completes receiving the first MPD; second, the receiving policy and the meter If the buffer unit reported by the Policy and Charging Enforcement Function (PCEF) has completed the message received by the first MPD, it is determined that the buffer unit completes receiving the first MPD, and before the PCEF reports, the buffer unit receives the received message. The event media stream sent by the server and the MPD event are reported to the PCE. F; Third, the first MPD directly received by the receiving buffer unit completes the received message, and then determines that the buffer unit finishes receiving the first MPD. In the method embodiment, the server sends the segment and the MPD to the UE by using the buffer unit, so that the video transmission efficiency can be improved.

FIG. 4 is a flowchart of Embodiment 3 of a video transmission method according to the present invention. As shown in FIG. 4, the method embodiment includes the following steps:

Step 401: The policy control unit receives the first load request information sent by the server, where the first load request information includes a UE identifier of the user equipment UE that sends the video information.

Step 402: The policy control unit acquires first load information of the network where the UE is located according to the UE identifier, and sends the first load information to the server.

Further, after the policy control unit sends the first load information to the server, the method further includes: the policy control unit receiving the second load request information sent by the server after sending the first MPD, where the second load request information includes the UE identifier; or, the receiving server The first MPD sent completes the sent message;

The policy control unit acquires second load information according to the UE identifier;

The policy control unit sends the second load information to the server.

Preferably, after the policy control unit sends the first load information to the server, the method further includes: the policy control unit, if it is determined that the buffer unit completes receiving the first MPD, acquiring second load information according to the UE identifier, where the cache unit may be located Core network side, including but not limited to

CDN cache unit;

The policy control unit sends the second load information to the server.

Specifically, after receiving the load request information sent by the server, the policy control unit triggers the base station of the network where the UE is located to report the base station load information to the policy control unit according to the UE identifier included in the load request information, but is not limited to the current number of accesses of the base station, Current traffic, number of users, available bandwidth of the cell, usage of the PRB, etc. After receiving the base station load information reported by the base station where the UE is located, the policy control unit obtains the load information of the current core network at the same time, and if the core network has uneven cell load, When the resource utilization is unbalanced, the core network load information is carried as the first load information in the first load response message and sent to the server, so that the server generates and generates according to the base station side load information and/or the core network load information. If the first segmen policy control unit of the first code rate that matches the first load information of the network where the UE is located receives the second load request sent by the server or receives the message that the first MPD sent by the server completes the sending, the second segmen policy control unit acquires the second Load information and return the second negative to the server Information. If the server sends the MPD and the segment to the UE through the buffer unit on the core network side, the policy control unit first determines whether the cache unit has completed the first MPD reception, and if it is determined that the first MPD completes the reception, actively acquires the load information at the next moment. That is, the second load information is reported to the server. Specifically, the policy control unit may detect the MPD receiving status of the buffer unit, and if it is detected that the first MPD has been received, determine that the first MPD of the buffer unit is received; or the buffer unit receives the Segment media stream sent by the server. The MPD event is reported to the PCEF, and the PCEF is further reported to the policy control unit, whereby the policy control unit determines that the buffer unit completes the reception of the first MPD, so that the policy control unit triggers the base station to subscribe to the base station load information at the next moment. And/or acquiring the core network load information at the next moment, that is, the second load information; or the buffer unit directly reporting the message that the first MPD file is received to the policy control unit, so that the policy control unit determines that the cache unit completes the first MPD reception.

In this embodiment, the base station side load information and the core network load information of the network where the UE is located are obtained by the policy control unit, and the base station side load information and/or the core network load information is sent to the server according to the load request information of the server, so that the server can obtain Real-time load information of the UE, and content preparation according to the real-time load information, so that a segment having a matching code rate with the real-time load information can be generated, and the media stream received by the UE side and the real-time load information of the UE are highly matched, which can be sufficient Utilize the real-time network bandwidth of the UE.

It should be noted that the technical solution of the video transmission method provided by the present invention can also be applied to other types of wireless networks, such as a Wireless Local Area Networks (WLAN), where the load information can be wireless. Network load information.

The technical method of the video transmission method provided by the present invention can also be applied to other service types that need to be updated by the MPD file, such as inserting new advertisements, new notifications, etc. on the on-demand content, and sending the update content while transmitting the media stream, so as to reduce the user initiative. Get network overhead due to updates.

The video transmission method provided by the present invention will be described below in conjunction with two specific embodiments.

FIG. 5 is a signaling flowchart of a fourth embodiment of a video transmission method according to the present invention. The method for transmitting a segment and an MPD directly to a UE by using a server, and using the policy control unit as a PCRF as an example, as shown in FIG. 5 The method embodiment includes the following steps:

Step 501: A UE sends a video transmission request to a server, where the video transmission request includes a UE identifier.

Step 502: The server sends first load request information to the PCRF, where the first load request information Contains the UE identifier;

Step 503: The PCRF subscribes to the radio access network (Radio Access Network, RAN for short) to request the first base station load information, where the radio access network is mainly a base station, including but not limited to a base station (NodeB), Radio Network Controller (RNC) and evolved NodeB (eNodeB);

Step 504: The RAN returns, to the PCRF, first base station load information, where the first base station load information includes, but is not limited to, a base station load, a current number of access users, and a cell available bandwidth.

Step 505: The PCRF obtains the first core network load information from a packet data gateway (Public Data NetWork Gateway, P-GW) on the core network side;

Step 506: The PCRF sends first load information to the server, where the first load information includes the foregoing first base station load information and/or the first core network load information.

Step 507: The server generates a first segment and a first MPD of the first code rate that match the first load information, where the first code rate may include multiple different first rate values, so that different UEs Select the first rate value that best matches your current channel;

Step 508: The server sends a first MPD to the UE, where the first MPD includes a first code rate. Step 509: The UE parses the first MPD, and obtains a first code rate that matches the channel of the first code rate. Value

Step 510: The UE sends a media fragmentation request to the server according to the first code rate value.

Step 511: Step 511: The server sends a second load request message to the PCRF, where the second load request information includes a UE identifier, or 511b, the server sends a message that the first MPD completes sending to the PCRF.

Step 512-step 515, the same as steps 503-506, and details are not described herein.

Step 516: The server generates a second segment and a second MPD of the second code rate that match the second load information, where the second code rate may include multiple different second code rate values, so that different UEs Select a second code rate value that best matches its current channel;

Step 517: The server sends, to the UE, a first segment having a first code rate value and a second MPD, where the second MPD includes a second code rate.

Step 518: The UE plays a first segment having a first code rate value while buffering, and parses the second MPD, and obtains a second code rate value that matches the channel of the second code rate.

Step 519: The UE sends a media fragmentation request according to the second code rate value. By the way, after step 519, steps 511-518 are repeatedly executed until the end of the video playback. During the transmission of the video, if the server detects that the UE has suspended the media fragmentation request, it stops sending the newly generated UE to the UE. MPD files and segments.

It should be noted that, the steps 511-515 and the step 510 may be performed simultaneously, or the steps 511-515 may be performed before the step 510.

In an embodiment of the method, the server obtains real-time load information of the network where the UE is located from the PCRF, and performs content preparation according to the real-time load information, and generates a segment that matches the real-time load information, so that the user can select the network load information. The segment matching the bit rate achieves a high matching between the media stream and the real-time network load information of the user, and fully utilizes the real-time network bandwidth of the UE; and actively pushes the MPD file corresponding to the next segment when sending the segment to the user. The network overhead caused by the user actively pulling MPD files.

FIG. 6 is a signaling flowchart of a video transmission method according to Embodiment 5 of the present invention. The method embodiment is directed to a scenario in which a server sends a segment and an MPD to a UE by using a cache unit, and the cache unit is a CDN cache unit and a policy control unit. The PCRF is used as an example. For other types of cache units, the implementation is similar. For details, the method is as follows. As shown in FIG. 6, the method includes the following steps:

Step 601: The UE sends a video transmission request to the server, where the video transmission request includes a UE identifier.

Step 602: The server sends first load request information to the PCRF, where the first load request information includes a UE identifier.

Step 603: The PCRF subscribes to the RAN where the UE is located to request the first base station load information, where the RAN is mainly a base station, including but not limited to a NodeB, an RNC, and an eNodeB, and details are not described herein.

Step 604: The RAN returns, to the PCRF, first base station load information, where the first base station load information includes, but is not limited to, a base station load, a current number of access users, and a cell available bandwidth.

Step 605: The PCRF obtains the first core network load information from the P-GW of the core network side. Step 606: The PCRF sends the first load information to the server, where the first load information includes the foregoing first base station load information and/or First core network load information;

Step 607: The server generates a first segment and a first MPD of the first code rate that match the first load information, where the first code rate may include multiple different first rate values, so that different UEs Select the first rate value that best matches your current channel; Step 608: The server sends a first segment and a first MPD to a CDN cache unit located at a core network side.

Step 609: The buffer unit sends a first MPD to the UE, where the first MPD includes a first code rate. Step 610: If the PCRF determines that the CDN buffer unit finishes receiving the first MPD, performing a step

611;

Step 611: The PCRF subscribes to the RAN where the UE is located to request the first base station load information. Step 612: The UE parses the first MPD, and obtains a first code rate value that matches the own channel from the first code rate.

Step 613: The UE sends a media fragmentation request to the server according to the first code rate value.

Step 614: The RAN returns second base station load information to the PCRF.

Step 615: The PCRF obtains the second core network load information from the P-GW of the core network side. Step 616: The PCRF sends the second load information to the server, where the second load information includes the foregoing second base station load information and/or Second core network load information;

Step 617: The server generates a second segment and a second MPD of the second code rate that match the second load information, where the second code rate may include a plurality of different second code rate values, so that different

The UE selects a second code rate value that best matches its current channel;

Step 618: The server sends the second segment and the second MPD to the CDN buffer unit located on the core network side.

Step 619: The CDN buffer unit has a first segment and a second MPD of the first code rate value to the UE, where the second MPD includes a second code rate.

Step 620: The UE plays a first segment having a first code rate value while buffering, and parses the second MPD, and acquires a second code rate value that matches the channel of the second code rate.

Step 621: The UE sends a media fragmentation request according to the second code rate value.

By the way, after step 621, steps 610-620 are repeatedly executed until the end of the video playback. During the transmission of the video, if the CDN buffer unit detects that the UE has suspended the media fragmentation request, it stops sending new to the UE. The generated MPD file and the segment.

It should be noted that the steps 614-616 and the steps 612-613 may be performed simultaneously, or the steps 614-616 may be performed before the steps 612-613.

In the embodiment of the method, on the basis of the method embodiment shown in FIG. 5, the server uses the buffer unit to send the segment and the MPD to the UE, which further improves the efficiency of video transmission. FIG. 7 is a schematic structural diagram of Embodiment 1 of a video transmission apparatus according to the present invention. As shown in FIG. 7, the video transmission apparatus 700 includes: a transceiver module 701, an acquisition module 702, and a media preparation module 703, where

The transceiver module 701 is configured to receive video request information sent by the user equipment UE, where the video request information includes a UE identifier.

The obtaining module 702 is configured to acquire first load information of the network where the UE is located according to the UE identifier, and the media preparation module 703 is configured to generate a first segment with a first code rate and a first MPD corresponding to the first segment, the first code The rate matches the first load information;

The transceiver module 701 is further configured to send the first MPD to the UE, so that the UE obtains the first code rate according to the first MPD;

The transceiver module 701 is further configured to receive the fragmentation request information sent by the UE, where the fragmentation request information includes a first code rate, and send the first segment to the UE according to the first code rate.

Preferably, the obtaining module 702 is further configured to: after the transceiver module 701 sends the first MPD file to the UE:

Obtaining second load information of the network where the UE is located according to the UE identifier;

The media preparation module 703 is further configured to generate a second segment having a second code rate and a second MPD corresponding to the second segment, where the second code rate matches the second load information;

Correspondingly, the transceiver module 701 is specifically configured to:

Sending the first segment and the second MPD to the UE, so that the UE receives the first segment, and acquires the second code rate according to the second MPD.

Further, the obtaining module 702 is specifically configured to:

Sending, to the policy control unit, first load request information, where the first load request information includes a UE identifier;

Receiving first load information sent by the policy control unit;

And sending, by the policy control unit, the second load request information, where the second load request information includes the UE identifier; or sending the first MPD complete sending message to the policy control unit, so that the policy control unit acquires the second load information according to the UE identifier;

Receiving second load information sent by the policy control unit.

Preferably, the video transmission device 700 further includes a cache module 704, configured to:

The media preparation module 703 generates a first segment having a first code rate and the first After the first MPD corresponding to the segment, the first segment and the first MPD are sent to the buffer unit; after the media preparation module 703 generates the second segment with the second code rate and the second MPD corresponding to the second segment, the buffer unit is Sending a second segment and a second MPD; correspondingly, the transceiver module 701 is specifically configured to:

Correspondingly, the obtaining module 702 is specifically configured to:

Receiving first load information sent by the policy control unit;

The second load information sent by the policy control unit is received, where the second load information is obtained by the policy control unit after determining that the buffer unit completes receiving the first MPD according to the UE identifier.

The video transmission device of this embodiment may be used to implement the technical solution in the method embodiment shown in FIG. 2 or FIG. 3, and the implementation principle and technical effects are similar, and details are not described herein.

FIG. 8 is a schematic structural diagram of Embodiment 2 of a video transmission apparatus according to the present invention. As shown in FIG. 8, the video transmission apparatus 800 includes: a request receiving module 801, a load obtaining module 802, and a load sending module 803, where

The request receiving module 801 is configured to receive first load request information sent by the server, where the first load request information includes a UE identifier of the user equipment UE that sends the video information.

The load acquisition module 802 is configured to obtain first load information of the network where the UE is located according to the UE identifier, and the load sending module 803 is configured to send the first load information to the server.

Further, the request receiving module 801 is further configured to: after the load load sending module sends the first load information to the server:

Receiving, by the server, the second load request information, where the second load request information includes the UE identifier; or: receiving, by the server, the first MPD to complete the sending message;

The load obtaining module 802 is further configured to acquire second load information according to the UE identifier.

The load sending module 803 is further configured to send second load information to the server.

Preferably, the load acquisition module 802 is further configured to: after the load sending module 803 sends the first load information of the media preparation module to the server:

If it is determined that the buffer unit completes receiving the first MPD, acquiring second load information according to the UE identifier; The load sending module 803 is further configured to send second load information to the server.

The video transmission device provided in this embodiment may be used to implement the technical solution in the method embodiment shown in FIG. 4, and the implementation principle and technical effects are similar, and details are not described herein.

FIG. 9 is a schematic structural diagram of a server according to an embodiment of the present invention. As shown in FIG. 9, the server 900 includes a first processor 901, and a first memory 902 connected to the first processor 901, where the first memory is The 902 can be configured to store load information, a segment, an MPD file corresponding to the segment, and a set of program codes, and the first processor 901 can execute the set of program codes to implement the video transmission shown in FIG. 2 or FIG. The technical solutions in the method embodiments are similar in implementation principle and technical effects, and details are not described herein.

10 is a schematic structural diagram of an embodiment of a policy control unit according to the present invention. As shown in FIG. 10, the policy control unit 1000 includes: a second processor 1001, and a second memory 1002 connected to the second processor 1001. The second memory 1002 can be used to store the load information and a set of program codes, and the second processor 1001 can execute the set of program codes to implement the technical solution in the embodiment of the video transmission method shown in FIG. The principle and technical effects are similar and will not be described again.

FIG. 11 is a schematic structural diagram of Embodiment 1 of a video transmission system according to the present invention. As shown in FIG. 11, the video transmission system 1100 includes: a server 1101, a policy control unit 1102, and at least one user equipment UE client 1103, where The server 1101 may be the technical solution in the embodiment of the method shown in FIG. 2, and the policy control unit may be the policy control unit shown in FIG. 10, which may be used to execute the method embodiment shown in FIG. In the technical solution, the implementation principle and technical effect are similar, and details are not described herein.

FIG. 12 is a schematic structural diagram of Embodiment 2 of a video transmission system according to the present invention. As shown in FIG. 12, the video transmission system 1200 includes: a server 1201, a policy control unit 1202, at least one user equipment UE client 1203, and a cache unit. 1204, wherein the server 1201 may be the server shown in FIG. 9 and may be used to execute the technical solution in the method embodiment shown in FIG. 3. The policy control unit may be the policy control unit shown in FIG. 10, and may be used to execute the method shown in FIG. The technical solution in the method embodiment may be a PCRF located on the core network side, but is not limited thereto. The buffer unit 1204 may be a CDN cache unit located on the core network side, but is not limited thereto, and the implementation principle and the technical effect are similar. The details will not be described again.

Through the description of the above embodiments, those skilled in the art can clearly understand this The invention may be implemented in hardware, or in firmware implementation, or a combination thereof. When implemented in software, the functions described above may be stored in or transmitted as one or more instructions or code on a computer readable medium. Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A storage medium may be any available media that can be accessed by a computer. By way of example and not limitation, computer readable media may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage media or other magnetic storage device, or can be used for carrying or storing in the form of an instruction or data structure. The desired program code and any other medium that can be accessed by the computer. Also. Any connection may suitably be a computer readable medium. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable , fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwaves are included in the fixing of the associated media. As used in the present invention, a disk and a disc include a compact disc (CD), a laser disc, a compact disc, a digital versatile disc (DVD), a floppy disc, and a Blu-ray disc, wherein the disc is usually magnetically copied, and the disc is The laser is used to optically replicate the data. Combinations of the above should also be included within the scope of the computer readable media.

Finally, it should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting thereof; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims

claims

1. A video transmission method, characterized by including:

The server receives the video request information sent by the user equipment UE, where the video request information includes the UE identification;

The server obtains the first load information of the network where the UE is located based on the UE identifier; the server generates a first media segment segment with a first code rate and a first media representation description corresponding to the first segment. File MPD, the first code rate matches the first load information;

The server sends the first MPD to the UE, so that the UE obtains the first code rate according to the first MPD;

The server receives the fragmentation request information sent by the UE, the fragmentation request information includes the first code rate, and sends the first segment to the UE according to the first code rate.

2. The method according to claim 1, characterized in that, after the server sends the first MPD file to the UE, it further includes:

The server obtains the second load information of the network where the UE is located according to the UE identifier; the server generates a second segment with a second code rate and a second MPD corresponding to the second segment, and the second segment The code rate matches the second load information;

The server sends the first segment to the UE according to the first code rate, including: the server sends the first segment and the second MPD to the UE, so that the UE receives the The first segment is obtained, and the second code rate is obtained according to the second MPD.

3. The method according to claim 2, wherein the server obtains the first load information of the network where the UE is located based on the UE identifier, including:

The server sends first load request information to the policy control unit, where the first load request information includes the UE identification;

The server receives the first load information sent by the policy control unit;

The server obtains the second load information of the network where the UE is located based on the UE identification, including:

The server sends second load request information to the policy control unit, where the second load request information includes the UE identifier; or, the server sends a first MPD completion message to the policy control unit, to causing the policy control unit to obtain the second load information;

The server receives the second load information sent by the policy control unit.

4. The method according to claim 2, characterized in that, after the server generates the first media segment segment with the first code rate and the first media representation description file MPD corresponding to the first segment, include:

The server sends the first segment and the first MPD to the cache unit;

After the server generates the second segment with the second code rate and the second MPD corresponding to the second segment, it also includes:

The server sends the second segment and the second MPD to the cache unit; the server sends the first MPD to the UE, including:

The server sends the first MPD to the UE through the cache unit;

The server sending the first segment and the second MPD to the UE includes: the server sending the first segment and the second MPD to the UE through the cache unit.

5. The method according to claim 4, wherein the server obtains the first load information of the network where the UE is located based on the UE identifier, including:

The server receives the first load information sent by the policy control unit;

The server receives the second load information sent by the policy control unit, where the second load information is obtained according to the UE identity after the policy control unit determines that the cache unit has completed receiving the first MPD. .

6. A video transmission method, characterized by including:

The policy control unit receives the first load request information sent by the server, where the first load request information includes the UE identification of the user equipment UE that sends the video information;

The policy control unit obtains the first load information of the network where the UE is located based on the UE identification, and sends the first load information to the server.

7. The method according to claim 6, characterized in that, the policy control unit After the server sends the first load information, it also includes:

The policy control unit receives the second load request information sent by the server, where the second load request information includes the UE identification; or, receives the first MPD completion message sent by the server;

The policy control unit obtains the second load information according to the UE identifier;

The policy control unit sends second load information to the server.

8. The method according to claim 6, characterized in that, after the policy control unit sends the first load information to the server, it further includes:

If the policy control unit determines that the cache unit has completed receiving the first MPD, it obtains the second load information according to the UE identifier;

The policy control unit sends second load information to the server.

9. A video transmission device, characterized by including:

A transceiver module, configured to receive video request information sent by the user equipment UE, where the video request information includes the UE identifier;

An acquisition module, configured to acquire the first load information of the network where the UE is located based on the UE identification; A media preparation module, configured to generate a first media segment segment with a first code rate and a media segment corresponding to the first segment. a first media representation description file MPD, the first code rate matches the first load information;

The transceiver module is further configured to send the first MPD to the UE, so that the UE obtains the first code rate according to the first MPD;

The transceiver module is also configured to receive fragmentation request information sent by the UE, where the fragmentation request information includes the first code rate, and send the first code rate to the UE according to the first code rate. segment.

10. The device according to claim 9, characterized in that: the acquisition module, after the transceiver module sends the first MPD file to the UE, is also used to:

Obtain the second load information of the network where the UE is located according to the UE identity;

The media preparation module is also configured to generate a second segment with a second code rate and a second MPD corresponding to the second segment, the second code rate matching the second load information; Transceiver module, specifically used for:

Send the first segment and the second MPD to the UE, so that the UE receives Receive the first segment, and obtain the second code rate according to the second MPD.

11. The device according to claim 10, characterized in that the acquisition module is specifically used for:

Send first load request information to the policy control unit, where the first load request information includes the UE identity;

Receive the first load information sent by the policy control unit;

Send second load request information to the policy control unit, where the second load request information includes the UE identity; or send a first MPD completion message to the policy control unit, so that the policy control unit Obtain the second load information according to the UE identity;

Receive the second load information sent by the policy control unit.

12. The device according to claim 10, further comprising a cache module for:

After the media preparation module generates the first media fragment segment with the first code rate and the first media representation description file MPD corresponding to the first segment, the first segment and the first segment are sent to the cache unit. 1MPD;

After the media preparation module generates the second segment with the second code rate and the second MPD corresponding to the second segment, send the second segment and the second MPD to the cache unit;

The transceiver module is specifically used for:

Send the first MPD to the UE through the cache unit; and send the first segment and the second MPD to the UE through the cache unit.

13. The device according to claim 12, characterized in that the acquisition module is specifically used for:

Receive the first load information sent by the policy control unit;

Receive second load information sent by the policy control unit, where the second load information is obtained according to the UE identity after the policy control unit determines that the cache unit has completed receiving the first MPD.

14. A video transmission device, characterized by including: A request receiving module, configured to receive the first load request information sent by the server, where the first load request information includes the UE identification of the user equipment UE that sends the video information;

A load acquisition module, configured to acquire the first load I of the network where the UE is located according to the UE identity,

A load sending module, configured to send the first load information to the server.

15. The device according to claim 14, wherein the request receiving module, after the load sending module sends the first load information to the server, is further configured to: receive the load information sent by the server. second load request information, the second load request information including the UE identification; or, receiving a message sent by the server indicating that the first MPD has completed sending; the load acquisition module is also configured to obtain the UE identification according to the Obtain the second load information; the load sending module is further configured to send the second load information to the server, where the second load information includes the second load information.

16. The device according to claim 14, wherein the load acquisition module, after the load sending module sends the first load information to the server, is also used to:

If it is determined that the cache unit has completed receiving the first MPD, obtain the second load information according to the UE identity;

The load sending module is also used to send second load information to the server.

17. A server, characterized in that it includes: a first processor, and a first memory connected to the first processor, the first memory can be used to store load information, media segment, and the media The media representation description file MPD corresponding to the segment, and a set of program codes. The first processor can execute the program codes to implement the steps in the video transmission method described in any one of claims 1-5. .

18. A strategy control unit, characterized in that it includes: a second processor, and a second memory connected to the second processor, the second memory being used to store load information, and a set of program codes, The second processor can execute the program code to implement the steps in the video transmission method described in any one of claims 6-8.

19. A video transmission system, characterized by comprising: the server as claimed in claim 17, the policy control unit as claimed in claim 18 and the user equipment UE client; or, comprising: as claimed in claim 17 The server, the policy control unit as claimed in claim 18, the caching unit and the user equipment UE client.