CN100461766C - A method and device for allocating resources for real-time streaming media services - Google Patents

Abstract

The invention discloses a method for allocating resources for a real-time streaming media service, comprising steps: a packet data service node captures a streaming media service message sent by a user terminal; and judges that a real-time streaming media service starts by analyzing the streaming media service message , Initiate a packet protocol PDP context update to reserve resources for the real-time streaming service; determine that the real-time streaming service ends, initiate a PDP context update, and take back the resources reserved for the real-time streaming service. The present invention also provides a device for allocating resources for real-time streaming media services, including: a detection/parsing module for capturing and analyzing service messages sent by user terminals, and for matching and judging real-time streaming media services and their guaranteed rates The matching judging module is a resource management module for reserving corresponding resources for the real-time streaming media service according to the guaranteed rate. By adopting the method of the invention, the service quality of real-time streaming media can be guaranteed, and the utilization rate of network resources can be improved.

Description

A method and device for allocating resources for real-time streaming media services

technical field

The present invention relates to the communication field, in particular to a method and device for allocating service resources.

Background technique

The rapid development of data services, especially the development of real-time data services (such as streaming media services), has brought a great impact on existing networks. Real-time data services have a large amount of data and require low latency, which is a big test for traditional data networks. With the growth of real-time data services, the following requirements are put forward for the existing network: the network can distinguish real-time services from non-real-time services, that is, it can have service awareness capabilities; it can perform differentiated processing on perceived real-time services, That is, it has the ability to handle business differentiation. It can be seen that the service awareness capability is the prerequisite for guaranteeing the Quality of Service (QoS) of the wireless network.

In the field of Universal Mobile Telecommunications System (UMTS) network, the perception of data services is an important content of 3GPP protocol standards. See Figure 1, which is a schematic diagram of the service awareness solution proposed by the existing 3GPP R99 protocol standard.

In the process of allocating resources for services through service awareness shown in Figure 1, the network side equipment (such as the gateway GPRS support node GGSN) does not have the service awareness capability, and the service awareness ability depends on the user terminal (User Equipment, UE). However, due to the capability limitation of the user terminal itself, the quality of service (Quality of Service, QoS) parameter carried by the user terminal in the protocol data packet (Protocol Data Packet, PDP) context request may not be completely consistent with the requirements of the business layer. That is to say, the QoS parameters reported by the user terminal to the UMTS network are not completely credible, and the network side (such as the radio access network RAN/core network CN/service platform) does not have the service awareness capability, and cannot truly perceive the user The business attribute (such as Traffic class) actually transmitted by the plane. Therefore, in the 3GPP R99 stage, the method of guaranteeing the service quality according to the QoS category and parameters requested by the user terminal cannot fully meet the real-time service requirements. If the user terminal does not carry QoS parameters in the PDP context establishment request, the network side generally reserves resources for the service according to the default QoS parameters or user subscription QoS parameters. Obviously, the default parameters and the QoS parameters subscribed by the user are not necessarily consistent with the current service requirements of the user.

To sum up, the scheme proposed in the 3GPP R99 protocol standard to perceive services through user terminals has the following disadvantages:

1. The network side cannot actively perceive the real-time streaming media service requested by the user, so it cannot dynamically allocate and reclaim corresponding resources for the requested streaming media service.

2. The network side cannot actively perceive the service attribute information of user service requests, and can only provide streaming media services by providing guaranteed bandwidth for all user services, which may cause waste of resources.

3. The correctness of the service quality request depends on the user terminal and the user terminal application to make correct service perception, QoS parameter mapping and service application, which is too dependent on the user terminal and the user terminal application layer, so it may be due to the limited capability of the user terminal, resulting in The reported information is inaccurate, causing the service quality of real-time services to not be guaranteed.

In the 3GPP R6 protocol standard, an end-to-end QoS architecture system is proposed. Referring to Figure 2, it is a schematic diagram of a service awareness solution proposed by the existing 3GPP R6 protocol standard.

In the process of allocating resources for services through service awareness shown in Figure 2, the UMTS network has the service awareness capability, but at the same time requires user terminals and the network to support the binding mechanism between the IP bearer layer and the application layer. The binding mechanism combines PDP context bearer and QoS policy information, and the binding information includes Authorization Token (the token is allocated by the policy control function) and IP media flow identifier (IP FlowIdentifier). The UMTS end-to-end QoS architecture system requires user terminals to have the following capabilities: support for the SIP protocol, support for reactivation capabilities, and support for token mechanisms.

In the service-aware solution proposed in the 3GPP R6 protocol standard, due to the large number of types of user terminals and application software in the existing network, and the inconsistent QoS capabilities of user terminals, the current broadband code division multiple access system (Wide-band Code Division Multiple Access, WCDMA) network end-to-end service quality is difficult to guarantee. In addition, this solution not only has special requirements for user terminals, but also requires the network to be able to support standard Go interfaces and Gq interfaces at the same time, which is difficult to implement in a short period of time, thus affecting the popularization and promotion of streaming media services.

The prior art also proposes a method for perceiving streaming media services through a service server on the network side, independent of terminal capabilities.

Referring to FIG. 3 , it is a schematic diagram of a perceptual streaming media service solution provided by the prior art. After the service server receives the service request from the user terminal, it initiates a service quality request to the QoS Policy Decision Function (Policy Decision Function, PDF). QoS parameters of streaming media services.

It can be seen from the above process that the functional effect provided by the above existing technical solution is basically consistent with the 3GPP R6 standard, and is not limited by the capability of the user terminal. The user terminal does not need to support SIP signaling, secondary activation or token mechanism, and can Strong implementation. However, this solution has the following disadvantages: non-standard protocol is used, the protocol interaction is complicated, and the supporting support of GGSN, PDF and streaming media server is required, and the project implementation is relatively difficult.

Contents of the invention

The present invention provides a method for allocating resources for real-time streaming media services. The real-time streaming media services requested by users are perceived by the network side, and corresponding resources are dynamically reserved for the real-time streaming media services requested by users and the reserved resources are recovered, so as to realize While ensuring the quality of streaming media services, the utilization rate of network resources is improved.

The invention also provides a device for allocating resources for real-time streaming media services.

The inventive method comprises steps:

The packet data service node captures the streaming media service message sent by the user terminal;

Judging that real-time streaming service starts by analyzing the streaming service message, initiates packet protocol PDP context update, and reserves resources for this real-time streaming service; judges that real-time streaming service ends, initiates PDP context update, and takes back as Resources reserved by the real-time streaming media service.

The packet data service node captures the streaming media service message sent by the user terminal, including:

The packet data service node captures and parses the service application layer message sent by the user terminal by detecting the Gi interface;

By matching the parsed packet information with the preset streaming media service matching information, it is judged whether the captured packet is a streaming media service packet.

The preset streaming media service matching information is streaming media program source information.

The source information of the streaming media program is the fixed port number of the RTSP protocol used by the streaming media server to control and play the streaming media program, the IP address of the streaming media server, or the URL address of the streaming media program source, or any combination of the above information.

According to the above method of the present invention, when the packet data service node parses out that the streaming media service message contains an order for setting or playing a streaming media program, it is judged that a real-time streaming media service starts; When the text contains a command to end the streaming media program, it is determined that the real-time streaming media service ends.

According to the above method of the present invention, after the packet data service node receives the streaming media service message and judges that there is a real-time streaming media service to start, the rate of the streaming media service is set, the PDP context parameter is updated, and the bandwidth is reserved for the streaming media service.

In the above method, the packet data service node parses the rate information from the streaming media service message, or obtains the rate matching the streaming media service according to the preset streaming media service rate matching information, and sets the rate of the streaming media service rate.

According to the above method of the present invention, when the real-time streaming service is concurrent with other services and shares a PDP context, the packet data service node uses a preset algorithm to reserve corresponding resources for the real-time streaming service.

In the above method, when the other concurrent services are real-time streaming services, the preset algorithm includes selecting the maximum rate among the concurrent services or the rate of the first initiated service as the concurrent real-time streaming services A common rate; or superimpose the rates of concurrent services, set the superimposed rate as the common rate of concurrent real-time streaming services, and update the service quality QoS parameters in the PDP context;

When the other concurrent services are real-time services of non-streaming media type, the preset algorithm includes selecting the maximum rate among the concurrent services to be set as the rate of the real-time streaming service; or increasing the rate of the concurrent services Superimposing, setting the superimposed rate as the rate of the real-time streaming service, updating the QoS parameters in the PDP context;

When the other concurrent services are non-real-time services, the rate of real-time streaming media services is selected, and the QoS parameters in the PDP context are updated.

According to the above method of the present invention, when one of the multiple concurrent real-time streaming media services sharing a PDP context ends, the packet data service node takes back the reserved resources according to the mode of reserving resources for multiple concurrent real-time streaming media services part of the resources;

When multiple concurrent real-time streaming media services are finished, the packet data service node takes back all reserved resources.

In the above method, if the packet data service node sets the rate of the real-time streaming media service by superimposing the rate, then when one of the services ends, the rate of the service is subtracted from the current superimposed rate, and the QoS parameter in the PDP context is updated ;

If the packet data service node selects the highest rate to set the rate of the real-time streaming service, then when one of the services ends, select the highest rate in the unfinished streaming service to update the QoS parameters in the PDP context.

According to the above method of the present invention, the packet data service node reclaims the resources reserved for the real-time streaming media service, which is realized by the following steps:

update the QoS parameters in the PDP context to the system default values; or

Restore the QoS parameters in the PDP context to the values before the real-time streaming service resources are updated.

According to the above method of the present invention, after the packet data service node judges that a real-time streaming service starts, it detects within a set time whether the user terminal initiates the establishment of a new PDP context for the real-time streaming service, and if so, prohibits the transmission of the real-time streaming service. The original PDP context of the real-time streaming media service is updated; otherwise, an update of the original PDP context is initiated.

According to the above method of the present invention, after the packet data service node initiates the PDP context update to reserve resources for the real-time streaming media service, and detects that the user terminal initiates the establishment of a new PDP context for the real-time streaming media service, it withdraws it for the real-time streaming media service. Resources reserved by the real-time streaming service in the original PDP context.

The device provided by the invention comprises:

Detection/analysis module, matching judgment module and resource management module;

The detection/parsing module detects and parses the message sent by the user terminal, and sends the parsed message information to the matching judgment module;

When the matching judging module judges that a streaming media service starts according to the parsed message information, it sends an instruction to reserve resources to the resource management module; Instructions to reserve resources;

The resource management module initiates a corresponding PDP context update according to the instruction, reserves resources for the real-time streaming service or withdraws the reserved resources.

According to the above device of the present invention, the detection/parsing module detects the Gi interface, captures and parses the service application layer message sent by the user terminal.

According to the above device of the present invention, the matching judging module includes a service matching submodule, a service start/end judging submodule and a rate matching submodule;

The service matching submodule matches the parsed message information with the preset streaming media service matching information, and judges whether the captured message is a streaming media service message, and if so, starts the service start/end judging submodule module and the rate matching submodule;

When the business start/end judging submodule judges that the message information contains an order for setting or playing a streaming media program, it sends an instruction to reserve resources to the resource management module; it judges that the message information contains an order for ending a streaming media program , sending an instruction to take back the reserved resources to the resource management module;

The rate matching submodule sets the rate matching the real-time streaming media service according to the preset streaming media service rate matching information, or sets the rate of the streaming media service according to the rate information parsed from the streaming media service message, and The set rate information is sent to the resource management module;

After the resource management module receives the resource reservation instruction or/and the set rate information, it updates the QoS parameters of the PDP context according to the set rate, and reserves the guaranteed bandwidth for the real-time streaming media service; After the instruction, set the current rate as the default rate of the system or the rate before the start of the streaming media service, update the parameters of the PDP context, and take back the guaranteed bandwidth reserved for the real-time streaming media service.

In the above device, the matching judging module further includes a concurrent judging/processing submodule;

When the concurrent judging/processing submodule judges that the real-time streaming media service is concurrent with other services and shares a PDP context, set a rate for the streaming media service according to a preset algorithm, and send the set rate information to the resource management module;

When the concurrent judging/processing submodule judges that one of the multiple concurrent and shared real-time streaming media services of a PDP context ends, set the rate for the unfinished streaming media business according to a preset algorithm, and set the set rate sending information to the resource management module;

After described concurrent judgment/processing submodule judges that a plurality of concurrent and shared real-time streaming services of a PDP context all end, the current rate is set to the system default rate or the rate before the streaming service starts, and the set rate sending information to the resource management module;

The resource management module updates the QoS parameters of the PDP context according to the set rate, and initiates the update of the PDP context.

In the above device, the matching judging module further includes a PDP context detection/processing submodule;

When the PDP context detection/processing sub-module detects that the user terminal initiates establishment of a new PDP context for the streaming media service, it sends an instruction to suppress resource reservation to the resource management module, and suppresses the request for carrying the streaming media service. The original PDP context initiates an update; or

Sending a resource recovery instruction to the resource management module to recover the resources reserved for the streaming media service in the original PDP context bearing the streaming media service.

The beneficial effects of the present invention are as follows:

(1) The present invention judges whether the user terminal initiates a service related to real-time streaming media by detecting and analyzing the message of the Gi interface by the packet data service node on the network side, and according to preset static matching information or dynamic analysis of the message in the message Rate information, set parameters that meet the quality of the streaming media service, and allocate corresponding resources for the streaming media service through the initiated PDP context update process. The real-time streaming media service perception method provided by the present invention can effectively improve the efficiency of data services and dynamically adjust the utilization of system resources, thereby minimizing the waste of air interface resources, improving the utilization rate of network resources, and ensuring the quality of streaming media playback .

(2) The present invention provides different solutions for multiple concurrent situations of real-time streaming media services and other services, so as to ensure the service quality of real-time streaming media, thereby improving the adaptability of the system.

(3) The present invention has no special requirements for user terminal capabilities, thus laying a broad user base for the promotion and popularization of streaming media services.

(4) The present invention perceives the streaming media service through the packet data service node on the network side, without the cooperation of other network elements, and has no special requirements for network elements such as the streaming media server and the QoS policy decision-making function PDF, and compared with the prior art, it reduces The difficulty and cost of engineering implementation of streaming media service deployment are reduced.

Description of drawings

Figure 1 is a schematic diagram of the service awareness solution proposed by the existing 3GPP R99 protocol standard;

Figure 2 is a schematic diagram of a service perception solution proposed by the existing 3GPP R6 protocol standard;

FIG. 3 is a schematic diagram of a perceptual streaming media service solution provided by the prior art;

Fig. 4 is the schematic flow chart of the present invention carries out streaming media resource allocation through GGSN perception real-time streaming service;

FIG. 5 is a schematic structural diagram of a device for allocating resources for a real-time streaming media service according to the present invention.

Detailed ways

The basic idea of the present invention is: in a wireless communication system, when a user terminal initiates a request for a real-time streaming media service, the packet data service node captures the message that the user starts the streaming media service according to the configured streaming media service information matching rules , initiate a PDP context update, and reserve corresponding resources for the real-time streaming media service requested by the user, so that the service quality of the real-time streaming media service is guaranteed. After the packet data service node captures the end message of the streaming media service initiated by the user, it takes back the network resources reserved for the real-time streaming media service.

In the present invention, the packet data service node realizes resource reservation and resource recovery for the real-time streaming media service by sensing the start and end of the real-time streaming media service. The packet data service node perceives the real-time streaming media service, including the perception of the following aspects:

Real-time streaming media service type perception;

Real-time streaming media service rate perception;

Real-time streaming service start and end perception;

Perception of secondary activation of real-time streaming media services;

Awareness of concurrent execution of real-time streaming services.

Among them, the perception of the type and rate of the real-time streaming media service, and the perception of the start of the real-time streaming media service are mainly used for the network side to initiate the PDP context update to reserve resources for the streaming media service; the perception of the end of the real-time streaming media service is mainly used for the network The side initiates PDP context update to timely release the resources reserved for streaming media services; the perception of real-time streaming media concurrent services is used to combine and overlay management of QoS parameters between streaming media and other services among multiple streaming media threads. The perception of real-time streaming media secondary activation is mainly used for special processing for terminals with streaming media awareness functions, such as reclaiming allocated resources

In order to realize the perception of the real-time streaming media service, the packet data service node detects the service application layer message sent by the user terminal flowing through the Gi interface at all times, analyzes the message, and realizes the above-mentioned services according to the analyzed information perception. Aiming at the service perception of the above several aspects, the present invention provides specific implementations respectively.

For the perception of real-time streaming media service types, the present invention provides the following implementation methods:

Method 1: Determine whether the service is a streaming service by analyzing the fixed port number specified in the Real Time Streaming Protocol (RTSP). The RTSP protocol stipulates that the fixed IP port number of the streaming media service is 554, and the RTSP protocol is concurrent with the Realtime Transport Protocol (RTP) that actually transmits the media stream. Therefore, if the resolved fixed port number is 554, it can be determined The service controlled by RTSP is a real-time streaming service.

Method 2: Determine whether the service is a streaming media service based on the resolved IP address of the service server. If the resolved IP address of the service server is the IP address of the streaming media server, it is determined that the service is a real-time streaming media service. This method is applicable to the application scenario of a dedicated streaming media server.

Method 3: judge whether the service is a streaming media service through the resolved Uniform Resource Locator (Uniform Resource Locator, URL) address of the service source. If the parsed URL address of the service source is the URL address of the streaming media program source, it is determined that the service is a real-time streaming media service.

One or more of the three methods for judging the streaming media service type can be selected and used in any combination.

The above three methods all need to set matching rules in advance, and the packet data service node judges the service type according to the matching rules. For the above three methods, matching rules can contain the following three types of information:

The streaming media server controls the fixed IP port number of the RTSP protocol for playing streaming media, usually port 554;

The IP/mask address of the dedicated streaming server;

Uniform resource locator URL address of streaming media program source.

The three methods for judging the type of the real-time streaming media service can be used in any combination. Therefore, the matching rule can contain one or more of the above three types of information. The packet data service node detects and parses the service application layer message of the Gi interface at all times, as long as the parsed message information matches one or more contents listed in the matching rule, it is judged that the relevant IP application service is a real-time streaming service .

The service quality requirements of different real-time streaming media services may also be different. The most important parameter in the QoS parameter is the guaranteed rate, that is, the stream rate of the program source. The perception of streaming media rate can be achieved through the following methods:

Method 1. By setting the static streaming media service rate matching information in advance, it is realized to determine the matching guaranteed rate for the real-time streaming media service.

For example, set the corresponding program source stream rate for the IP address of the streaming media server, so as to realize the uniform designation of the guaranteed rate for the streaming media programs played on the streaming media server with the IP address. This method is applicable to all streaming media program source streams on the streaming media server The case of consistent speed. Table 1 gives an example of the IP address of a streaming media server and the rate of program source stream.

Table 1:

Streaming server IP address Program source stream rate 129.108.27.15 100kbps 129.108.27.18 64kbps * 144kbps (default configuration) ....

For another example, set the corresponding program source stream rate for the URL address, so as to realize the specified guaranteed rate for the streaming media program at the URL address. This method is applicable to the situation that program sources of different rates are stored on a streaming media server but in different paths. Table 2 gives an example of URL address and program source stream rate.

Table 2:

URL address Program source stream rate http://www.cctv.com/news 64kbps http://www.cctv.com/soccer 100kbps * 144kbps (default configuration) ....

As another example, the source rate of streaming media programs is configured by default, such as 144kbps. When the resolved IP address of the streaming media server or the URL address of the streaming media program source is not set to match the program source stream rate, and the system does not support the resolution of the SDP rate information of the RTSP protocol, the statically configured default Guaranteed rate, so that these streaming services set the default guaranteed rate.

Method 2: Analyze the SDP information in the message through the RTSP protocol to obtain the code stream rate of the streaming media program source.

The streaming media program source file contains a rate description, and the rate description information is included in the Session Description Protocol (Session Descriptor Protocol, SDP) information of the streaming media service message. Therefore, by analyzing the SDP, the source code stream of the program can be known rate. This is a method for dynamically obtaining the source stream rate of streaming media programs. The rate information of related media sub-streams sensed by this method is the most accurate and comprehensive. Therefore, this method is the most reliable rate sensing method.

For the perception of the start and end of real-time streaming media service playback, in addition to resource reservation and resource recovery for real-time streaming media services, it can also be used to time streaming media services that need to be charged according to the playing time.

The method for the packet data service node to sense the start of the real-time streaming service includes:

Method 1. The packet data service node parses the playback command of the RTSP protocol, such as the PLAY command, or other RTSP commands before the playback command, such as the SETUP or DESCRIBE command, then this moment can be used as the streaming media start time.

Method 2. After the packet data service node perceives the streaming media service type, such as URL address, streaming media server IP address or IP port number, etc., it can use this moment as the streaming media start time.

The method for the packet data service node to sense the end of the real-time streaming service includes:

Method 1. The packet data service node resolves to an end command of the RTSP protocol, such as a TEARDOWN command, and uses this moment as the end time of streaming media playback.

Method 2. If the packet data service node does not support the protocol analysis of the RTSP layer, the release time of the TCP connection can also be roughly determined as the end time of streaming media playback, because RTSP is carried on top of the TCP connection, and the TCP connection will also be disconnected after the RTSP session ends. freed.

For the perception of concurrent execution of real-time streaming media services, the implementation method is as follows:

Each streaming media service has a unique session identifier (SESSION ID), therefore, when GGSN perceives that multiple streaming media SESSION IDs are playing simultaneously in a PDP context, it is judged that there are multiple real-time streaming media at this time Business concurrent.

Taking the resource allocation process of the real-time streaming media service in the UMTS system as an example, the process of resource allocation by sensing the real-time streaming media service in the present invention will be described in detail below.

Referring to Fig. 4, it is the flow diagram that the present invention carries out streaming media resource allocation through GGSN perception real-time streaming service, and specific steps include:

1. The user terminal initiates an activation process to the GGSN to notify the GGSN that the user terminal will initiate a service request, and the GGSN allocates a PDP context for the user terminal and establishes an IP bearer;

2. The user terminal initiates an application process to the streaming media server through the RTSP protocol, applies for the use of the selected or specified streaming media program, and the network side performs authentication and authentication processing on the user's request.

3. The user terminal initiates a playback request to the streaming media server through the RTSP protocol.

After the user terminal passes the authentication, it initiates a playback request for the streaming media program to the streaming media server, and the request carries information such as the IP address of the streaming media server, the URL address of the streaming media program, the SDP information of the streaming media program, and the playback command. The requested data message flows through the Gi interface (that is, the interface between the GGSN and the external shared data network PDN).

4. After sensing the streaming media service, the GGSN updates the PDP context and reserves resources for the streaming media service.

The GGSN detects the service application layer packets flowing through the Gi interface at all times. When the GGSN detects that there are service application layer packets sent by the user terminal on the Gi interface, it parses them and performs matching according to the preset streaming media service matching rules. . After judging that the data packet is a data packet of a real-time streaming media service according to the preset matching method and matching information, the GGSN also needs to perceive the rate of the streaming media program (both the stream rate can be determined through the preset static matching information). The stream rate of the media program source can be obtained by dynamically analyzing the SDP information, as described above). Generally speaking, after the GGSN perceives the type and rate of real-time streaming media services, it will determine the QoS update parameters in the PDP context according to the perceived rate, initiate PDP upstream text updates, and reserve corresponding guaranteed bandwidth for streaming media services.

When the perceived streaming media program needs to be charged by time, the GGSN also needs to sense the playing start and end time of the real-time streaming media service, so as to accurately calculate the playing time.

When real-time streaming services and other non-real-time services (such as Interactive, Background services) are concurrent and share a PDP context, the GGSN updates the QoS parameters in the PDP context to the QoS parameters required to ensure the quality of real-time streaming services, That is: set the Traffic Class parameter to Streaming, and set the guaranteed rate to the guaranteed rate of the real-time streaming service.

When streaming media services are concurrent with non-streaming media real-time services, such as conversational services (Conversational), the GGSN sets the value of the Traffic class in the QoS parameter as Conversational, and the value of the guaranteed rate can be obtained using different algorithms, such as: (1) Take the highest rate in the thread as the guaranteed rate; (2) Superimpose the guaranteed rates of multiple services, but ensure that the rate after the superposition of services cannot exceed the guaranteed rate signed by the user.

When multiple real-time streaming service threads on a user terminal are concurrent and share a PDP context, the GGSN sets the Traffic class in the QoS parameter as Streaming, and the value of the guaranteed rate can be obtained by using different algorithms, such as: (1) Take the guaranteed rate of the streaming media thread initiated first; (2) take the highest guaranteed rate in the thread; (3) superimpose the guaranteed rates of multiple streaming media threads, but ensure that the rate after the business superposition cannot exceed the user's contracted rate Guaranteed speed.

During the real-time media service, if the user terminal, SGSN or other entity initiates a PDP context update message, the GGSN will update it according to the normal protocol flow. At this time, the QoS parameters corresponding to the original real-time streaming media service may change.

5. The GGSN initiates a PDP context update request process.

The GGSN initiates a PDP context update request to the SGSN, and the SGSN sends the updated PDP context to the RAN through layer-by-layer transmission, so that the RAN updates the QoS parameters corresponding to the real-time streaming media service according to the updated PDP context, which is reserved for the real-time streaming media service corresponding guaranteed bandwidth.

The streaming media program is sent from the streaming media server to the user terminal according to the guaranteed bandwidth reserved for it.

6. The user terminal initiates a TEARDOWN request through the RTSP protocol, requesting to end the playing of the streaming media program. The request message includes an end command, and the data message flows through the Gi interface.

7. After the GGSN perceives the end of the real-time streaming service, it updates the content of the PDP upstream text and takes back the resources reserved for the streaming service.

The GGSN detects the service application layer packets flowing through the Gi interface at all times. When the GGSN detects that there are service application layer packets sent by the user terminal on the Gi interface, it parses them and performs information processing according to the preset streaming media service matching rules. match. After judging that the data message is a real-time streaming media service data message according to the preset matching method and matching information, the GGSN will also determine whether the data message contains an RTSP protocol command to end streaming media playback according to the analysis result . After judging that the end command of the RTSP protocol is included in the data message, the GGSN updates the PDP context, and updates it to the default QoS configuration of the system, or restores it to the QoS configuration before the execution of the streaming media service. The recovered QoS parameters cannot exceed the user's subscribed QoS parameters.

For the streaming media service charged by time, after the GGSN parses the end command, the timer should be stopped so as to obtain the execution time of the real-time streaming media service for charging.

When multiple real-time streaming media services are executed concurrently and share a PDP context, when one of the streaming media threads ends, the GGSN determines the guaranteed rate according to the algorithm used in the process of reserving resources for these streaming media services Reclaim resources in appropriate ways, such as:

(1) When the GGSN superimposes the rate of multiple streaming media threads as the guaranteed rate of the current PDP context, at this time, the GGSN can reclaim some of the resources occupied, such as reclaiming the resources occupied by the streaming media thread that has finished playing, The specific method is to subtract the rate of the terminated thread from the guaranteed rate used by multiple current streaming media threads, and use it as the guaranteed rate of the current PDP context.

(2) When GGSN takes the highest rate among multiple streaming media threads as the guaranteed rate of the current PDP context, assuming that there are N streaming media threads sharing the current PDP context, at this time, GGSN is in the remaining unfinished N- Take the maximum guaranteed rate in one thread as the guaranteed rate of the current PDP context.

(3) When GGSN takes the rate of the streaming media thread initiated first as the guaranteed rate of the current PDP context, at this time, as long as there is currently a streaming media thread that has not finished playing, the rate of the current PDP context can remain unchanged.

When the last streaming media service process ends, the GGSN initiates a recovery process for all streaming media resources.

8. The GGSN initiates a PDP context update request process.

The GGSN initiates a PDP context update request to the SGSN, and the SGSN sends the updated PDP context to the RAN through layer-by-layer transmission, so that the RAN updates the QoS parameters of the corresponding streaming media service according to the updated PDP context, and the real-time streaming media service occupies resources are released.

When some user terminals start real-time streaming media services, they can automatically trigger the secondary activation of PDP to generate a new PDP context (ie, the second PDP context), so as to be used exclusively for playing streaming media programs, while the perception of GGSN and PDP context update is for the first PDP context (i.e. the original PDP context), in order to suppress the invalid update of the first PDP context by GGSN, the present invention provides the following two methods:

Method 1. If the GGSN perceives the real-time streaming service and initiates a PDP context update for it, it finds that the user terminal has created a new PDP context to carry the streaming service through secondary activation (through the Gn interface, that is, between the SGSN and the GGSN. The detection on the signaling plane determines whether the user terminal creates a new PDP context through secondary activation), at this time, the GGSN initiates an update request for the first PDP context to the SGSN, and updates the QoS parameters to the parameters before streaming media perception, or system settings The default QoS parameters.

Method 2: When the GGSN perceives the streaming media service, it does not initiate a PDP context update, but starts a timer. Within the set time, if the GGSN receives the second PDP activation initiated by the user terminal (establishing the second PDP context of the user plane), it will refrain from initiating an update request for the first PDP context to the SGSN and stop the timer . After the timer stops counting, the GGSN resumes normal work. If the timer expires, it indicates that the user terminal has not initiated PDP secondary activation. At this time, the GGSN initiates a PDP context update request to the SGSN to reserve resources for real-time streaming services.

In addition to being applicable to UMTS networks, the above process can also be applied to General Packet Radio Service (GPRS) networks and Code Division Multiple Access (CDMA) networks, or other wireless networks that can carry streaming media services. Communications network. In the GPRS network, the GGSN senses and allocates resources for the streaming media service, and in the CDMA network, the Packet Data Service Node (PDSN) senses and allocates resources for the streaming media service.

Based on the above method, the present invention also provides a device for allocating resources for real-time streaming media services, which can dynamically allocate corresponding resources for streaming media services by sensing the real-time streaming media services initiated by user terminals.

Referring to FIG. 5 , it is a schematic structural diagram of a device for allocating resources for a real-time streaming media service according to the present invention. The device specifically includes: a detection/analysis module, a matching judgment module, and a resource management module.

The detection/parsing module detects and analyzes the service application layer message sent by the user terminal flowing through the Gi interface in real time, and sends the parsed message information to the matching judgment module. When the matching judging module judges that a streaming media service starts according to the parsed message information, it sends an instruction to reserve resources to the resource management module; when it judges that a real-time streaming media service ends, it sends an instruction to take back reserved resources to the resource management module. The resource management module initiates a corresponding PDP context update according to the instruction, reserves corresponding resources for the real-time streaming service or withdraws the reserved resources.

The matching judging module includes a service matching submodule, a service start/end judging submodule and a rate matching submodule.

The business matching sub-module matches the parsed message information with the preset static streaming media service matching information (such as streaming media server IP address or streaming media program source URL address), and judges whether the captured message is a streaming media service report or not. If so, start the service start/end judging submodule and the rate matching submodule.

When the business start/end judging submodule judges that the message information contains an order for setting or playing a streaming media program (such as the PLAY command of the RTSP protocol, the SETUP command, etc.), it sends an instruction to reserve resources to the resource management module; the message information is judged When the command (such as the TEARDOWN command of the RTSP protocol) to end the streaming media program is included in the command, an instruction to take back the reserved resource is sent to the resource management module.

The rate matching sub-module obtains the matching rate according to the preset streaming media service rate matching information (such as the IP address of the streaming media server and the corresponding stream rate of the streaming media program), and sets it as the guaranteed rate of the streaming media service ; or set the rate information parsed from the message information (such as the SDP information in the message) as the guaranteed rate of the streaming media service. The rate matching sub-module sends the set guaranteed rate information to the resource management module.

After the resource management module receives the resource reservation instruction or/and the guaranteed rate information set, it updates the QoS parameters of the PDP context according to the guaranteed rate, and reserves the guaranteed bandwidth for the real-time streaming media service; receives an instruction to reclaim the reserved resources Finally, the current guaranteed rate is set to the system default rate or the rate before the streaming service starts, the parameters of the PDP context are updated, and the guaranteed bandwidth reserved for the real-time streaming service is withdrawn.

The matching judging module also includes a concurrent judging/processing sub-module, in which an algorithm for setting the guaranteed rate of concurrent services is preset. When the concurrency judging/processing sub-module judges that the real-time streaming media service is concurrent with other services and shares a PDP context, it sets a guaranteed rate for the streaming media service according to a preset algorithm, and sends the set guaranteed rate information to the resource management module. When the concurrency judging/processing sub-module judges that one of the multiple concurrent real-time streaming services sharing a PDP context ends, set the guaranteed rate for the remaining unfinished streaming media services according to the preset algorithm, and update the current rate. And send the updated rate information to the resource management module. After the concurrency judging/processing sub-module judges that multiple concurrent real-time streaming services that share a PDP context are all over, the current rate is updated to the system default rate or the rate before the streaming service starts, and the updated rate information sent to the resource management module. The resource management module updates the QoS parameters of the PDP context according to the set guaranteed rate, and initiates the update of the PDP context.

The matching judgment module also includes a PDP context detection/processing sub-module. When the PDP context detection/processing sub-module detects that the user terminal establishes the second user plane PDP context (i.e. a new PDP context) carrying streaming media services through secondary activation, it sends an instruction to suppress resource reservation to the resource management module, and suppresses Initiate an update to the first user plane PDP context (i.e. the original PDP context) that bears the streaming media service; or send a resource recovery command to the resource management Resources reserved by the media business.

In summary, the present invention detects and parses the message of the Gi interface by the packet data service node on the network side, judges whether the user terminal initiates a real-time streaming media-related service, and analyzes the message according to the preset static matching information or dynamically Determine the parameters that meet the quality of the streaming media service, and allocate corresponding resources for the streaming media service through the initiated PDP context update process. The real-time streaming media service perception method provided by the present invention can dynamically adjust the utilization of system resources, thereby minimizing the waste of air interface resources, improving the utilization rate of network resources, and ensuring the quality of streaming media playback. The present invention also provides different solutions for multiple concurrent situations of real-time streaming media services and other services, so as to ensure the playback quality of real-time streaming media, thereby improving the adaptability of the system.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (19)

1. one kind is the method for real time flow medium traffic assignments resource, it is characterized in that, comprises step:

Group data service node is caught the streaming media service message that user terminal sends;

Judge that by resolving described streaming media service message the professional beginning of real time flow medium is arranged, initiate the data pack protocol PDP Context and upgrade, be the professional reserved resource of this real time flow medium; Judging has the real time flow medium service ending, initiates PDP Context and upgrades, and regains to be the professional reserved resource of this real time flow medium.

2. the method for claim 1 is characterized in that, described group data service node is caught the streaming media service message that user terminal sends, and comprising:

The service application layer message that user terminal sends is caught and resolved to group data service node by detecting the Gi interface;

Be complementary by message information that will parse and the streaming media service match information of presetting, judge whether the message that captures is the streaming media service message.

3. method as claimed in claim 2 is characterized in that, described default streaming media service match information is a flow-medium performance source information.

4. method as claimed in claim 3, it is characterized in that, described flow-medium performance source information is RTSP agreement stiff end slogan, the streaming media server IP address of streaming media server controls playing flow-medium performance, or the uniform resource locator URL address in flow-medium performance source, or the combination in any of above information.

5. the method for claim 1 is characterized in that, when group data service node parsed the order that comprises setting or playing stream media program in the described streaming media service message, judging had the professional beginning of real time flow medium; When comprising the order that finishes flow-medium performance in parsing described streaming media service message, judging has the real time flow medium service ending.

6. the method for claim 1, it is characterized in that, after group data service node receives that streaming media service message and judgement have the professional beginning of real time flow medium, the speed of streaming media service is set, upgrade the PDP Context parameter, be the streaming media service bandwidth reserved.

7. method as claimed in claim 6, it is characterized in that, group data service node parses rate information from described streaming media service message, or obtains the speed that is complementary with described streaming media service according to default streaming media service rate matching information, and the speed of streaming media service is set.

8. the method for claim 1 is characterized in that, when real time flow medium business and other service concurrences and a shared PDP Context, it is the corresponding resource of the professional reservation of described real time flow medium that group data service node adopts default algorithm.

9. method as claimed in claim 8, it is characterized in that, when concurrent described other business were the real time flow medium business, then described default algorithm comprised that the speed of the business of choosing speed maximum in the voice and packet data concurrent service or first initiation is set to the professional common speed of concurrent real time flow medium; Or the speed of voice and packet data concurrent service superposeed, the speed after the stack is set to the professional common speed of concurrent real time flow medium, upgrades the quality of service qos parameter in the PDP Context;

When concurrent described other business were the real time business of non-Streaming Media type, then described default algorithm comprises chose the speed that speed maximum in the voice and packet data concurrent service is set to described real time flow medium business; Or the speed of voice and packet data concurrent service superposeed, the speed after the stack is set to the speed of described real time flow medium business, upgrades the qos parameter in the PDP Context;

When concurrent described other business are non-real-time service, then choose the speed of real time flow medium business, upgrade the qos parameter in the PDP Context.

10. the method for claim 1, it is characterized in that, after a service ending in the real time flow medium business of a plurality of concurrent and shared PDP Contexts, group data service node is according to regaining the part resource of reservation for the mode of a plurality of concurrent professional reserved resources of real time flow medium;

After a plurality of concurrent real time flow medium business all finished, group data service node was regained all resources of reserving.

11. method as claimed in claim 10, it is characterized in that, if group data service node adopts the mode of stack speed that the speed of real time flow medium business is set, then after one of them service ending, from the speed of current stack, deduct this professional speed, upgrade the qos parameter in the PDP Context;

If group data service node is chosen the speed that flank speed is provided with the real time flow medium business, then after one of them service ending, choose the flank speed in the also unclosed streaming media service, upgrade the qos parameter in the PDP Context.

12. the method for claim 1 is characterized in that, described group data service node is regained and is the professional reserved resource of described real time flow medium, realizes by following steps:

Qos parameter in the PDP Context is updated to system default value; Or

Qos parameter in the PDP Context is reverted to described real time flow medium service resources upgrade preceding numerical value.

13. the method for claim 1, it is characterized in that, after the group data service node judgement has the professional beginning of real time flow medium, in setting-up time, detect user terminal and whether initiate to set up a new PDP Context at described real time flow medium business, if the former PDP Context of then restraining carrying described real time flow medium business upgrades; Otherwise, initiate renewal to described former PDP Context.

14. the method for claim 1, it is characterized in that, after group data service node initiation PDP Context is updated to the professional reserved resource of real time flow medium, when detecting user terminal again and initiating to set up a new PDP Context, regain it and be this real time flow medium business reserved resource in former PDP Context at described real time flow medium is professional.

15. one kind is the device of real time flow medium traffic assignments resource, it is characterized in that, also comprises detection/parsing module, matching judgment module and resource management module;

Described detection/parsing module detects message and the parsing that user terminal sends, and the message information that parses is sent to described matching judgment module;

When described matching judgment module has streaming media service to begin according to the message information judgement that parses, send the instruction of reserved resource to described resource management module; Judge when the real time flow medium service ending is arranged, send the instruction of regaining reserved resource to described resource management module;

Described resource management module is initiated corresponding PDP Context according to instruction and is upgraded, and is professional reserved resource of real time flow medium or withdrawal reserved resource.

16. device as claimed in claim 15 is characterized in that, described detection/parsing module detects the Gi interface, catches and resolve the service application layer message that user terminal sends.

17. device as claimed in claim 15 is characterized in that, described matching judgment module comprises professional matched sub-block, professional beginning/end judgement submodule and rate-matched submodule;

Described professional matched sub-block is complementary message information that parses and the streaming media service match information of presetting, judge whether streaming media service message of the message capture, if then start described professional beginning/end and judge submodule and described rate-matched submodule;

Described professional beginning/end is judged when submodule is judged the order that comprises setting or playing stream media program in the message information, to the instruction of described resource management module transmission reserved resource; Judge and send the instruction of regaining reserved resource to described resource management module when comprising the order that finishes flow-medium performance in the message information;

The speed that streaming media service rate matching information setting that described rate-matched submodule basis is default and real time flow medium business are complementary, or the speed of streaming media service is set, and the rate information that is provided with is sent to described resource management module according to the rate information that from the streaming media service message, parses;

Described resource management module is received the resource reservation instruction or/and behind the rate information of described setting, according to the qos parameter of the speed renewal PDP Context that is provided with, for the professional reservation of real time flow medium guarantees bandwidth; After receiving the instruction of regaining reserved resource, speed or streaming media service that present rate is set to system default begin preceding speed, upgrade the parameter of PDP Context, and regaining is the professional assurance bandwidth of reserving of real time flow medium.

18. device as claimed in claim 17 is characterized in that, described matching judgment module also comprises a concurrent judgement/processing sub;

When described concurrent judgement/processing sub is judged the real time flow medium business with other service concurrences and a shared PDP Context, be that streaming media service is provided with speed according to default algorithm, and the rate information that is provided with is sent to described resource management module;

When described concurrent judgement/processing sub is judged service ending in the real time flow medium business of a plurality of concurrent and shared PDP Contexts, according to default algorithm is that also unclosed streaming media service is provided with speed, and the rate information that is provided with is sent to described resource management module;

After described concurrent judgement/processing sub judges that an a plurality of concurrent and real time flow medium business shared PDP Context all finish, speed or streaming media service that current speed is set to system default begin preceding speed, and the rate information that is provided with is sent to described resource management module;

Described resource management module is initiated PDP Context and is upgraded according to the qos parameter of the speed renewal PDP Context that is provided with.

19. device as claimed in claim 17 is characterized in that, described matching judgment module also comprises PDP Context detection/processing sub;

Described PDP Context detection/processing sub detects user terminal when initiating to set up a new PDP Context at described streaming media service, send the instruction of restraining resource reservation to described resource management module, restrain the former PDP Context that carries described streaming media service is initiated to upgrade; Or

Send the resource recovery command to described resource management module, being retracted in the former PDP Context that carries described streaming media service is this streaming media service reserved resource.

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