CN100417247C - The method of determining the control server in the session - Google Patents

Abstract

The invention discloses a method for determining a control server in a session, which is used to solve the problem of waste of system resources caused by using a PoC server inviting a client or a PoC presiding server with a group ID as a PoC session control server in the prior art. The present invention assumes the PoC servers involved in the PoC session as control servers respectively, calculates the system cost value of each PoC server as the control server to transmit the voice stream, obtains the minimum value of the system cost, and determines the PoC server corresponding to the minimum value of the system cost as the PoC The session controls the server, thus effectively avoiding the waste of system resources.

Description

The method of determining the control server in the session

technical field

The present invention relates to PoC (Push to talk over Cellular, wireless push-to-talk) technology, in particular to a method for determining a control server in a PoC session.

Background technique

PoC (Push to talk over Cellular) technology is a service that uses mobile terminals and mobile networks to implement functions similar to walkie-talkies. The application of PoC technology is based on IP network, and its cost is far lower than the voice service of ordinary mobile terminals, which is also one of the important reasons to attract consumers and operators.

The PoC system includes a PoC server and a PoC client. The PoC client resides in a mobile terminal for accessing PoC services; the PoC server provides network functions at the application level for PoC services, and is divided into PoC control servers and PoC according to different functions. Participation server, the PoC control server provides centralized PoC session manipulation, media distribution, voice flow control and other functions, the PoC control server does not directly communicate with the PoC client, but interacts with the PoC client through the PoC participation server.

When the PoC session participants are distributed in different PoC servers, which PoC server is selected as the PoC control server can determine the system cost required for the system to transmit voice streams. In the prior art, the PoC server that invites the client or the PoC moderator server with the group ID is generally used as the default PoC control server, and the problem of selecting a PoC control server at a suitable location to minimize the system cost of transmitting voice streams is not considered. , resulting in a waste of system resources.

Contents of the invention

The present invention provides a method for determining a control server in a session to solve the problem of waste of system resources caused by using a PoC server inviting a client or a PoC presiding server with a group ID as a PoC session control server in the prior art.

The inventive method comprises:

A method for determining a control server in a session, comprising the steps of:

The initial control server calculates respectively the system cost value of the PoC server transmitting the voice stream as the control server, the PoC server is the PoC server involved in the PoC session, and the system cost value represents the occupation of the system resources by the PoC session;

The initial control server determines the minimum system cost value, and determines the PoC server corresponding to the system cost value as the PoC session control server.

The PoC server involved in the PoC session is the PoC server involved in the shortest transmission path between PoC session users, and the PoC session users include the inviter and the invitee of the PoC session.

The PoC server involved in the PoC session is the PoC server involved in the shortest transmission path between the actual participants of the session.

The system cost for each PoC server involved in the PoC session as the control server to transmit the voice stream is calculated by the control server currently used by the PoC session.

Periodically calculate the system cost value of each PoC server involved in the PoC session, and determine the minimum system cost value.

When the actual participant of the session changes, the system cost value of each PoC server involved in the PoC session is calculated, and the minimum system cost value is determined.

The method for determining the minimum system cost value is:

The minimum system cost value is determined as the smaller one between the currently calculated minimum system cost value and the original system cost minimum value.

The method for determining the minimum system cost value is:

Determine whether the difference between the minimum value of the currently calculated system cost and the minimum value of the original system cost reaches a predetermined threshold value, if so, determine the minimum value of the currently calculated system cost as the minimum system cost value, otherwise set the original system cost The minimum value is determined as the smallest system cost value.

If the determined minimum system cost value is the minimum value of the current calculated system cost, then the PoC server corresponding to the current calculated minimum system cost is switched to the control server, and the switched control server sends other PoC servers involved in the PoC session Send control server change notification.

The beneficial effects of the present invention are as follows:

Because the method for judging the control server in the PoC session of the present invention is by respectively assuming the PoC server involved in the PoC session as the control server, calculates the system cost value of the PoC server involved in each PoC session as the control server to transmit the voice stream respectively, and draws the system cost The PoC server with the smallest value consumes the least system cost when the PoC server serves as the PoC session control server for voice stream transmission, effectively avoiding the waste of system resources.

Furthermore, the present invention sets a system cost difference threshold in the control server, and only performs server switching when the difference before and after the system cost reaches the threshold, thereby avoiding frequent switching of control servers in PoC sessions and enhancing the system cost. stability.

Description of drawings

Fig. 1 is the flow chart that the present invention determines control server in PoC session;

Fig. 2 is a flow chart of the first method of determining the minimum value of the system cost in the present invention;

FIG. 3 is a flow chart of the second method for determining the minimum value of the system cost in the present invention.

Detailed ways

The specific implementation of the method for determining the control server in the PoC session of the present invention will be described in detail below with reference to various drawings.

For each session participant in a PoC session, the system cost for transmitting a voice stream is the cost of the voice stream during the process from the session participant sending the voice stream to the other session participants receiving the voice stream The sum of the weights of all passing sections is used to represent the occupation of system resources by the PoC session. In a PoC session where the session participants are fixed, the system cost for transmitting the voice stream is only related to the location of the PoC session control server, and has nothing to do with which session participant sends the voice stream. The system cost for any session participant to send out the voice stream is the same as each other. The present invention selects a PoC server at a reasonable location as the PoC session control server, thereby achieving the purpose of minimum system cost required for transmitting voice streams.

Fig. 1 shows that the present invention determines the flow chart of control server in PoC session, and its main implementation process is as follows:

Step S10, setting an initial control server, where the initial control server can be a PoC server inviting a client or a PoC server with a group ID;

Step S20, during the PoC session, select the shortest transmission path of the PoC session from multiple reachable transmission paths, the shortest transmission path of the PoC session is between the PoC user and the user or between the participants of the PoC session The shortest transmission path, where the PoC users involved in the session are the inviter and the invitee of the PoC session, regardless of whether they have already participated in the PoC session;

Step S30, the initial control server calculates the system cost value of transmitting the voice stream when each PoC server on the shortest transmission path of the PoC session is used as the control server, and determines the PoC server with the smallest system cost value;

Step S40, the initial control server takes the PoC server with the smallest system cost as the PoC optimal server, and judges whether the PoC optimal server is the initial control server, if so, continue to use the initial control server, otherwise execute step S50;

Step S50, the initial control server sends a switching request to the PoC optimal server, if the PoC optimal server agrees to the request, the initial control server sends a switching command to the PoC optimal server, the two parties exchange control information, and the PoC optimal server switches to PoC Session control server, the switched PoC session control server sends a control server change notification to other PoC servers on the shortest transmission path. If the switch fails, it only replies the switching failure message to the original PoC control server, and the original PoC control server continues to serve as the PoC control server.

In step S30, the initial control server uses two methods to determine the minimum value of the system cost, which will be described below.

The first way to determine the minimum value of the system cost is shown in Figure 2, and its main implementation process is as follows:

Step S21, set P _SYS as the variable that records the minimum value of the system cost, X is the variable that records the PoC server identification, N is the total number of PoC servers on the shortest transmission path, and X=1 of the initial control server is set;

Step S22, calculating the system value P _server1 of the initial control server SERVER1, P _SYS = P _server1 ;

Step S23, X=X+1, calculate the system cost value P _serverX with SERVER X as the control server;

Step S24, judging whether P _serverX is smaller than P _SYS , if so, then P _SYS =P _serverX , otherwise P _SYS =P _SYS ;

Step S25, judging whether X is equal to N, if so, execute step S26, otherwise repeatedly execute step S23, step S24;

In step S26, the final value of P _SYS is the minimum value of the system cost.

The second way to determine the minimum value of the system cost is shown in Figure 3, and its main implementation process is as follows:

Step S31, let X be a variable for recording the PoC server identification, N be the total number of PoC servers on the shortest transmission path, and set X=1 of the initial control server;

Step S32, calculating and saving the system cost value P _server1 of the initial control server SERVER1;

Step S33, X=X+1, calculate and save the system cost value P _serverX with SERVER X as the control server;

Step S34, judging whether X is equal to N, if so, execute step S35, otherwise, return to step S33;

Step S35, select the minimum value from each system cost value, which is the minimum value of the system cost.

Furthermore, during the PoC session, the joining and exiting of session participants may bring changes in the system cost, and the currently used control server may no longer be the PoC optimal server with the smallest system cost. In this case, the currently used control server assumes the PoC servers currently involved in the PoC session as the control servers, and calculates the system cost of transmitting the voice stream when each PoC server is used as the control server. If the system cost is smaller The PoC optimal server switches the PoC optimal server to the PoC session control server.

Two trigger mechanisms can be used to trigger the determination of the control server, which are described below:

The first trigger mechanism is that the control server currently used by the PoC session judges whether the minimum value of the system cost changes every predetermined time interval;

The second trigger mechanism is that the control server currently used by the PoC session learns that the participants in the PoC session change and judges whether the minimum value of the system cost changes.

Furthermore, if the session participants frequently join and exit the PoC session, it will lead to frequent switching of the control server, which will inevitably affect the stability of the system. In order to prevent frequent switching of the control server, the system cost difference threshold can be set in the control server, and only when the difference before and after the system cost reaches the threshold value, the action of switching to the PoC optimal server is performed; If the difference before and after does not reach the threshold value, continue to use the current control server.

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 (10)

1. determine the method for Control Server in the session, it is characterized in that, comprise step:

Initial Control Server calculates the systematic cost value of Push to talk over Cellular PoC server as Control Server transmission speech stream respectively, and this PoC server is the PoC server that relates in the PoC session, and this systematic cost value characterizes PoC session taking system resource;

Initial Control Server is determined minimum systematic cost value, and the PoC server of this systematic cost value correspondence is defined as the PoC session Control Server.

2. determine the method for Control Server in the session according to claim 1, it is characterized in that the PoC server that relates in the described PoC session is the PoC server that relates in the short transmission path between the PoC session user.

3. determine the method for Control Server in the session according to claim 2, it is characterized in that described PoC session user comprises the inviter and the invitee of PoC session.

4. determine the method for Control Server in the session according to claim 1, it is characterized in that the PoC server that relates in the described PoC session is the PoC server that relates in the short transmission path between the actual participation person of session.

5. determine the method for Control Server in the session according to claim 1, it is characterized in that each the PoC server that relates in the PoC session transmits speech stream as Control Server systematic cost value is calculated by the Control Server of the current use of this PoC session.

6. determine the method for Control Server in the session according to claim 1, it is characterized in that, regularly calculate the systematic cost value of each the PoC server that relates in the PoC session, and determine minimum systematic cost value.

7. determine the method for Control Server in the session according to claim 1, it is characterized in that, when session actual participation person changes, calculate the systematic cost value of each the PoC server that relates in the PoC session, and determine minimum systematic cost value.

8. determine the method for Control Server in the session according to claim 1, it is characterized in that the method for the systematic cost value of described definite minimum is:

Smaller between current calculating gained systematic cost minimum value and the original system cost minimum value is defined as minimum systematic cost value.

9. determine the method for Control Server in the session according to claim 1, it is characterized in that the method for the systematic cost value of described definite minimum is:

Judge whether the difference between current calculating gained systematic cost minimum value and the original system cost minimum value reaches predetermined threshold, if, then current calculating gained systematic cost minimum value is defined as minimum systematic cost value, otherwise original system cost minimum value is defined as minimum systematic cost value.

10. determine the method for Control Server according to Claim 8 or in the 9 described sessions, it is characterized in that, if the systematic cost value of the minimum of determining is current calculating gained systematic cost minimum value, PoC server that then will this current calculating gained systematic cost minimum value correspondence switches to Control Server, and other PoC servers that the Control Server after the switching relates in PoC session send Control Server Notifications of Changes.

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