On Internet, nowadays, the structure of multimedia conferencing is being constructed and this structure is composed of conferencing management service and data transmission service.
Conference management service defines the protocol of the advertisem...
On Internet, nowadays, the structure of multimedia conferencing is being constructed and this structure is composed of conferencing management service and data transmission service.
Conference management service defines the protocol of the advertisement, invitation, control and reservation of resource for multimedia conference. And multimedia data transmission service defines the protocol of the real time data transmission and reliable data transmission.
Contrary to ordinary protocol that imposes the conferencing control traffic on session participator, LGCCP(Local Group based Conference Control Protocol) reduces the traffic for conference control message constructing each receiver as local group.
This protocol permits local participators to construct group and solves re-transmission problem in a group. Each group makes his representative, and he communicates with other group's representative and he sends the message to all participators in his group. And this protocol maintains the robustness for hindrance of representative.
In the case of local group constructing, although a number of participators in wide area request data re-transmission, the waste of network resource of data transmission for data retransmission or strong-coupled property could be reduced because of constructing local group. This protocol supports the scalability regardless of the number of receiver, does conference control more sufficiently.
This paper designs and implements TRDMP(Tree-based Reliable Dissemination Muticast Protocol with Differential Control) suitable for one to multi application. This TRDMPis composed of TRTP(Tree-based Reliable Transfer protocol) related to data transmission, DCTCP(Dynamic Control-Tree Configuration Protocol) related to control tree composition.
TRDMP uses layered control tree based on local group to solve the weak point of sender based protocol and receiver based protocol. There is group administrator for error control in each group and group administrator is selected dynamically. The TRDMP minimizes the recover time of errors and the congestion of ACK message. And it supports the flow control and the stagnation control to avoid bottleneck. Flow control uses the rated based, windows based way and stagnation uses the slow start, congestion avoidance way.
The TRDMP minimizes the time of transmission delay and error recover, recovers the fault tolerance of group administrator. Also it offers different flow control and congestion control service on different situation. The merit of different control service is that the time of data transmission is different through different service, as data transmission time is similar to every receiver's time through one flow control and congestion control.