Abstract.A Medium Access Control (MAC) protocol of the Reservation Random Access (RRA) family is integrated with a hierarchical video-coding scheme, to realize effective real-time video services over the up-link of a mobile wireless network. For every picture or for each group of contiguous pictures (GOP), the encoder generates an information set organized in a hierarchical layered structure. The base layer contains the information needed to a low quality video; the other layers contain data, which, if received and dccoded, can enhance the video quality. The basic idea is to reserve bandwidth only to grant the transmission of' base laycr information, and modify thc MAC scheme to manage the video enhancemcnt data togethcr with voice/dota streams. by adaptivcly transmitting the incrcincntal video information only it' the performances of other traftic classcs will not drop below a certain thrcshold. The aim or this proposal is the improvement of the video stream quality in low load conditions, without a significant reduction ot' other traffic classes performance during high load periods. Scvcral simulation rcsults show thc cffcctivcncss of the proposcd mcthod.
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