Reliable Software Download Transmission Format Selection Scheme in association with a Dynamic Power Control Mechanism
Original Publication Date: 2003-Sep-25
Included in the Prior Art Database: 2003-Sep-25
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Among technologies for software defined radio concepts, Software Download (SD) management is a very important group of technologies, which targets at reliable SD with high successful download probability and low interference being generated in the networks. In order to reduce the interference from the common channel, which is used for the SD, a circular software download approach has been proposed. As compensation for segmented software packets due to discontinuous download behavior in each cell, packet-indexing can be used. To further reduce party effects in an interference-limited system, e.g. WCDMA (Wideband Code Division Multiple Access), Power Control (PC) should be implemented in the broadcasting channels. Furthermore, the Quality of Service (QoS) of the SD is highly dependent on the Transmission Format (TF) the system chooses in the download mode. For example spreading factor, channel coding scheme, and transmission power supplied by the base station will highly influence the successful download rate and the downloading time. This treatise uses a multiple-control loop structure, which describes the relationships of the different control loops of the SD management. This is illustrated in figure 1. Three basic loops controlling the SD process are shown. The selection of the TF and the related SIR target takes place in the outer loop. The device that judges which TF is suitable, could for example be located in the RNC (Radio Network Controller). Hereinafter the RNC is considered to select the TF.