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Predictive Software Radio Interface Downloading in a SDR context Disclosure Number: IPCOM000005361D
Original Publication Date: 2001-Aug-31
Included in the Prior Art Database: 2001-Aug-31
Document File: 6 page(s) / 233K

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Predictive Software Radio Interface Downloading in a SDR context

This text was extracted from a WORD97 document.
This is the abbreviated version, containing approximately 33% of the total text.

Predictive Software Radio Interface Downloading in a SDR context


The use of Software Defined Radio (SDR) will enable mobile users to evolve in a multi-technology environment. Thus, there will be an ever increasing need for the user to be supplied with the proper radio interface (i.e. pertinent to the context). Thus, it clearly appears that depending on the situation encountered by the user, several radio interfaces will have to be downloaded during the communication time if we consider the realistic hypothesis that all technologies will not be available everywhere. This will be facilitated by the fact that in a SDR context, terminals will not be provided with frozen radio interface but rather with the possibility of downloading the proper radio interface when needed.

A problem to be solved is that of maximizing a user's chances of being provided with the right radio interface at the right time.

The most critical issues are error-free operation of the inter-radio access handover and software downloading (of a new Radio Access Technology- RAT).

The proposed solution aims at minimizing the risk of a dropped call when performing an inter-system handover in a multi-RAT context. The objective of the considered approach is to prevent the possible unavailability of a RAT interface and it acts consequently in order for the terminal to be provided with the right interface whenever needed. In order to do so, a predictive method evaluates the probability of a user entering an area where his current RAT will be unavailable.

Based on that evaluation, the correct RAT interface is likely to be downloaded in advance when the user is still positioned in good radio conditions on the current RAT. Moreover, as downloading is anticipated, it becomes then possible to do it progressively, offering advantages for efficient operation at low data rate and minimizing the interference introduced to any other concurrent radio links.

Step #1: Acquire information concerning the environment in which the user is evolving

Let the RAT Identifier List (RIL) be the list containing the identifier (index) of L potential existing RATs: RIL {l, l [1, ..., L]},

And let the BS Identifier List (BIL) be the index list referencing the Base Station within the surrounding cells: BIL {n, n [1, ..., N]}, N being the upper index.

Two pieces of information are needed to process the software downloading decision:

1) Information #1: RATs availability within the user neighbouring cells

Two approaches can be considered in order to collect information about neighbouring areas (RATs used by the BS).

"Centralized approach": ie. utilization of the information known by the network, providing the Mobile Station (MS) with the proper information. By being aware of information such as the availability of RATs used by the BSs in the surrounding cells of the co...