Method and system for session participation through chat PoC group invitation reservation in PoC system
Disclosed are a method and a system in which a client intending to participate in a chat Push-to-talk over Cellular (PoC) group, presents a session participation-invitation reservation to a server when the number limit has been exceeded pursuant to the policy of the chat PoC group, or when a chat PoC group ID exists but a corresponding session has not been initiated. Herein, when a client intending to participate in a chat PoC group receives a response indicating participation is not possible because the number limit of the chat PoC group has been exceeded, the client performs invitation reservation until participation is possible.
1. A server for managing session participation in an existing session, by a plurality of clients connected to a Session Initiation Protocol/Internet Protocol (SIP/IP) core network, the server comprising:
a transceiver for receiving a session participation message including a session invitation reservation for reserving participation in the existing session from a client of the plurality of clients; and
a controller for identifying the session invitation reservation included in the received session participation message, for determining whether the existing session is in a state in which the client can participate in the existing session, according to the session invitation reservation, and if the client cannot participate in the existing session, for monitoring the existing session to determine whether the existing session goes into the state in which the client can participate in the existing session, and if the client can participate in the existing session, notifying the client of session participation.
2. The server of claim 1 , wherein the session participation message comprises a communication request message, and includes at least one parameter of address information, required media, information on a characteristic value reporting a service, and an invitation reservation.
3. The server of claim 2 , wherein the invitation reservation parameter is for performing invitation reservation until the existing session is in the state in which the client can participate in the existing session.
4. The server of claim 1 , wherein the existing session is not in the state in which the client can participate in the existing session when the existing session is not in progress or when a number of participants participating in the existing session has exceeded a number limit.
5. The server of claim 1 , wherein the existing session is in the state in which the client can participate in the existing session, when a number limit of the existing session has not been reached or when the existing session has been initiated.
6. A client for session participation in an existing session, the client comprising:
a transceiver for transmitting a request message for session participation in an existing session and receiving an error response message when the session participation in the existing session is not possible;
a controller for generating a session invitation reservation message used for reserving participation in the existing session when receiving the error response message, and transmitting the session invitation reservation message to a server corresponding to the existing session, through the transceiver, and for notifying the client of the session participation, when participation in the existing session is possible.
7. The client of claim 6 , wherein the session participation request message comprises a session initiation request message, and includes an invitation reservation parameter for performing invitation reservation until participation in the existing session is possible.
8. The client of claim 6 , wherein participation in the existing session is not possible, when the existing session is not in progress or when a number of participants participating in the existing session has exceeded a number limit.
9. The client of claim 8 , wherein participation in the existing session is possible, when a number limit of the existing session has not been reached or when the existing session has been initiated.
10. A method for participating in an existing session through a Session Initiation Protocol/Internet Protocol (SIP/IP) core network by a server, the method comprising the steps of:
receiving a session participation request message from a client, the session participation request message including a session invitation reservation for reserving participation in the existing session;
checking if the existing session is in a state in which the client can participate in the existing session;
continuously checking if the existing session enters into the state in which the client can participate in the existing session, when the client cannot participate in the existing session; and
transmitting a message notifying session participation to the client, when the existing session is in the state in which the client can participate in the existing session.
11. The method of claim 10 , wherein the session participation request message comprises a communication request message, and includes at least one parameter of address information, required media, information on a characteristic value reporting a service, and an invitation reservation.
12. The method of claim 11 , wherein the invitation reservation parameter is for performing invitation reservation until the existing session is in the state in which the client can participate in the existing session.
13. The method of claim 10 , wherein the existing session is not in the state in which the client can participate in the existing session, when the existing session is not in progress or when a number of participants participating in the existing session has exceeded a number limit.
14. The method as claimed in claim 13 , wherein the existing session is in the state in which the client can participate in the existing session, when a number limit of the existing session has not been reached or when the existing session has been initiated.
15. A method for participating in a existing session through a Session Initiation Protocol/Internet Protocol (SIP/IP) core network, by a client, the method comprising the steps of:
transmitting, by the client, a request message for session participation in an existing session to the server;
receiving an error response message, when the session participation in the existing session is not possible;
generating a session invitation reservation message for reserving participation in the existing session;
transmitting the session invitation reservation message to a server corresponding to the existing session; and
receiving a message notifying session participation, when participation in the existing session is possible.
16. The method of claim 15 , wherein the session participation request message comprises a session initiation request message, and includes an invitation reservation parameter for performing invitation reservation until participation in the existing session is possible.
17. The method of claim 15 , wherein the client cannot participate in the existing session when the existing session is not in progress or when a number of participants participating in the existing session has exceeded a number limit.
18. The method of claim 17 , wherein the client can participate in the existing session, when a number limit of the existing session has not been reached or when the existing session has been initiated.