CROSS-LAYER OPTIMIZATION METHOD IN A MULTIMEDIA TRANSMISSION SYSTEM
Disclosed are cross-layer optimization method where information about lots of dynamic changes in wireless environment is shared and cross-layer optimization is implemented through abstraction layer component. Multimedia transport layer operating method where optimization of first layer and second layer is implemented by using service information provided from first layer having transport layer and network layer and second layer having datalink layer and physical layer. The operating method includes upward abstraction step where service information provided to second layer is processed and processed service information is provided to multimedia transport layer and downward abstraction step where indication information provided from multimedia transport layer is processed and processed service information is provided to second layer. Consequently, there is advantage that all layers share diverse information about lots of dynamic changes in wireless environment, and the diverse information can be controlled to allow transmission where QoS is ensured more effectively.
1 . A method performed by a multimedia transport system for transmitting multimedia data, the method comprising:
receiving, in a multimedia transport layer of the multimedia transport system, multimedia data to be transmitted to a receiver;
mapping, in an abstraction layer of the multimedia transport system that is in data communication with the multimedia transport layer, service information provided by a second layer of the multimedia transport system onto service information of the multimedia transport layer;
processing, in the abstraction layer, indication information provided by the multimedia transport layer that is based on the service information of the second layer;
providing the processed indication information to the second layer; and
transmitting, via a data link layer of the second layer, the multimedia data to the receiver based on the provided indication information, the multimedia data transmitted to the receiver having a data format and transmission protocol defined by the multimedia transport layer.
2 . The method of claim 1 , wherein the transmission protocol is defined based on HTTP protocol or RTP/RTCP protocol by the multimedia transport layer.
3 . The method of claim 1 , wherein the second layer provides service information that varies dynamically depending on characteristics of a communication network.
4 . The method of claim 3 , wherein the communication network is a network capable of transmitting and receiving multimedia data provided by the multimedia transport layer.
5 . The method of claim 1 , wherein the second layer changes, based on the indication information, service information that is provided when the multimedia data is transmitted to the receiver.
6 . The method of claim 1 , wherein the multimedia transport layer performs cross-layer optimization when the multimedia transport layer is applied to a mobile terminal and a Universal Mobile Telecommunication Network Terrestrial Radio Access Network (UMTS) wireless network.
7 . A computer-readable storage medium whose contents, when executed by a computing system, cause the computing system to perform operations for transmitting multimedia data to a receiver, the operations comprising:
receiving, in a multimedia transport layer of the multimedia transport system, multimedia data to be transmitted to a receiver;
mapping, in an abstraction layer of the multimedia transport system that is in data communication with the multimedia transport layer, service information provided by a second layer of the multimedia transport system onto service information of the multimedia transport layer;
processing, in the abstraction layer, indication information provided by the multimedia transport layer that is based on the service information of the second layer;
providing the processed indication information to the second layer; and
transmitting, via a data link layer of the second layer, the multimedia data to the receiver based on the provided indication information, the multimedia data transmitted to the receiver having a data format and transmission protocol defined by the multimedia transport layer.