Method for an intersystem connection handover
First Claim
1. A method for controlling an intersystem handover from a first radio access technology (RAT1) with a first transmission method (GSM) to a second radio access technology (RAT2) with a second transmission method (UMTS), in which a transmission quality (quality) with respect to transmission characteristics to a base transceiver station (BTS) of the first radio access technology (RAT1), determined by a subscriber station (UE), is compared with a threshold value (QSEARCH), and if this quality drops below the threshold value (QSEARCH), an additional determination of a transmission quality (quality) with respect to transmission characteristics to a base transceiver station (NB) of the second radio access technology (RAT2) is stimulated, the determination being continued until a criterion (QSEARCH_HYST, QSEARCH TIME) separate from the threshold value (QSEARCH) is met.
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Accused Products
Abstract
The invention relates to a method for an intersystem connection handover. A transmission quality to a base station of a first radio communication system determined by a subscriber station is compared with a threshold value. If said value is lower than the threshold value, a transmission quality determination routine to a base station of the second radio communication system is triggered, the determination routine being continued until a criterion separate of the threshold is fulfilled.
41 Citations
13 Claims
- 1. A method for controlling an intersystem handover from a first radio access technology (RAT1) with a first transmission method (GSM) to a second radio access technology (RAT2) with a second transmission method (UMTS), in which a transmission quality (quality) with respect to transmission characteristics to a base transceiver station (BTS) of the first radio access technology (RAT1), determined by a subscriber station (UE), is compared with a threshold value (QSEARCH), and if this quality drops below the threshold value (QSEARCH), an additional determination of a transmission quality (quality) with respect to transmission characteristics to a base transceiver station (NB) of the second radio access technology (RAT2) is stimulated, the determination being continued until a criterion (QSEARCH_HYST, QSEARCH TIME) separate from the threshold value (QSEARCH) is met.
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6. The method as claimed in a preceding claim, in which the values with respect to the transmission quality (quality) to the base transceiver station (BTS) of the first radio access technology (RAT1), determined during the time interval (QSEARCH_TIME), are averaged and the averaged value is compared with the threshold value (QSEARCH) after the time interval has elapsed.
- 8. The method as claimed in a preceding claim, in which a hysteresis (QSEARCH_HYST) depending on the value of the threshold value (QSEARCH) is used as the criterion.
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11. The method as claimed in a preceding claim, in which the first radio access technology (RAT1) supports a GSM transmission method (GSM) and the second radio access technology (RAT2) supports a UMTS transmission method (UMTS).
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12. A base station subsystem (BSS) of a radio access technology (RAT1, RAT2) for carrying out the method as claimed in a preceding claim, the radio access technology (RAT1, RAT2) being implemented as a mobile radio system or as a wireless subscriber access system.
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13. A subscriber station (UE) for carrying out the method as claimed in a preceding claim.
Specification
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- Resources
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Current AssigneeVivo Mobile Communication Co., Ltd. (Vivo Communication Technology Co. Ltd.)
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Original AssigneeSiemens AG
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InventorsFaerber, Michael
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current455/437
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CPC Class CodesH04W 36/14 Reselecting a network or an...H04W 36/30 by measured or perceived co...
