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Reliable Software Download Transmission Format Selection Scheme in association with a Dynamic Power Control Mechanism

IP.com Disclosure Number: IPCOM000018934D
Original Publication Date: 2003-Sep-25
Included in the Prior Art Database: 2003-Sep-25
Document File: 3 page(s) / 136K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

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.

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© SIEMENS AG 2003 file: 2003J08446.doc page: 1

Reliable Software Download Transmission Format Selection Scheme in association with a Dynamic Power Control Mechanism

Idea: Eiman Mohyeldin, DE-Munich; Jijun Luo, DE-Munich; Markus Dillinger, DE-Munich; Roger Abdallah Abou-Jaoude, DE-Munich

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.

The RNC undergoes two phases: the initialization phase and the ongoing phase (figure 2). Before the SD process is started, the TF in the first download cycle is selected according to the SD profile, which includes the user profile (terminal capabilities amongst others), priorities of software, and the load of the radio network in which the SD takes place. During the download phase the TF is kept constant for each SD cycle. This reduces the probability of an unsuccessful download resulting from a wrongly decoded TF indicator in the Software Data Channel (SDC). The TF is only changed after one SD cycle is completed. In order to support dynamic TF selection, the mobile terminals are required to report the Quality of Service (QoS) of the SD to the base station. Based on the reported download pattern, such as Signal to Interference Ratio (SIR) measurements, the network decides whether to further carry out the SD using common channels or to change to dedicated channels, and then selects the next TF. In addition, the RNC has to check the users' profiles stored or mirrored in its database to make sure that all users can correctly decode the new transmission...