Multi-mode radio telephone with velocity sensing mode selection
First Claim
1. A radio telephone operative in at least two radio telephone systems, the radio telephone comprising communication means respectively associated with each of the radio telephone systems, at least one of the radio telephone systems being a cellular system and at least one of the radio telephone systems being a non-cellular system, sensing means for sensing the velocity of movement of the radio telephone, and selection means responsive to the sensing means for selecting one of respective said communication means for the said telephone systems in dependence, wholly or partially, on the sensed velocity,wherein the telephone systems include a micro-cellular telephone system and a macro-cellular telephone system, the selection means selecting the micro-cellular system when the velocity is low and selecting the macro-cellular system when the velocity is high, and wherein the telephone systems have networks with which the telephone communicates and at least one network has means for detecting radio telephone velocity and for transmitting information regarding said velocity to the radio telephone.
7 Assignments
0 Petitions
Accused Products
Abstract
A radio telephone (200) is operable in a cordless telephone system or in a cellular telephone system. The telephone (200) incorporates circuitry to detect user velocity so that when the user travels more quickly the telephone automatically transfers from cordless mode, which is the preferred mode, to cellular mode. This prevents the degeneration in communication quality which frequently occurs when a user of a cordless system travels faster than walking pace.
156 Citations
13 Claims
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1. A radio telephone operative in at least two radio telephone systems, the radio telephone comprising communication means respectively associated with each of the radio telephone systems, at least one of the radio telephone systems being a cellular system and at least one of the radio telephone systems being a non-cellular system, sensing means for sensing the velocity of movement of the radio telephone, and selection means responsive to the sensing means for selecting one of respective said communication means for the said telephone systems in dependence, wholly or partially, on the sensed velocity,
wherein the telephone systems include a micro-cellular telephone system and a macro-cellular telephone system, the selection means selecting the micro-cellular system when the velocity is low and selecting the macro-cellular system when the velocity is high, and wherein the telephone systems have networks with which the telephone communicates and at least one network has means for detecting radio telephone velocity and for transmitting information regarding said velocity to the radio telephone.
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9. A radio telephone operative in at least two radio telephone systems, the radio telephone comprising communication means respectively associated with each of the radio telephone systems, at least one of the radio telephone systems being a cellular system and at least one of the radio telephone systems being a non-cellular system, sensing means for sensing the velocity of movement of the radio telephone, and selection means responsive to the sensing means for selecting one of respective said communication means for the said telephone systems in dependence, wholly or partially, on the sensed velocity,
wherein the telephone systems include a micro-cellular telephone system and a macro-cellular telephone system, the selection means selecting the micro-cellular system when the velocity is low and selecting the macro-cellular system when the velocity is high, wherein the selection means are operative to determine the variation in strength of a signal received by the radio telephone, in order to sense user velocity, wherein the selection means determine the rate of change with time of the strength of the received signal, in order to sense user velocity, and wherein the selection means comprise averaging means operative to determine average values of the received signal over successive predetermined time intervals, difference means operative to compare the averaged value with a preceding averaged value to determine a difference value, comparative means operative to compare the difference with a predetermined difference and to initiate transfer of the macro-cellular system it the prevailing difference value exceeds the predetermined difference value by more than a predetermined threshold.
Specification