| 摘要 |
Advertisements are transferred to mobile handheld displays (MHDs) during slack time, when the spectrum is not busy for download at, and storage on, the MHDs. The stored advertisements are then selectively rendered during available ad spots when the user is viewing content on the MHD. A main code page that comprises all of the pixels that are static within the ad is initially transmitted to the MHD. This transmission is then followed by the transmission of additional packets that include information that only concerns the pixels in the main code page that change from frame to frame, along with information regarding the location of such changes within the code page. There are typically only a small number of changes between frames in an ad, such that only a small amount of information need be transmitted to represent these changes, when compared to the amount of information contained in each frame of the ad. Thus, the bandwidth requirement for transmission of these changes is much less than that of the actual frames.
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