Frequency, time and power level diversity system for digital radio telephony
First Claim
1. A method for transmitting messages on any of a predetermined plurality of different carrier frequencies comprising:
- transmitting a particular message from one station to another station at a first power level, at a first time and on a first carrier frequency; and
transmitting the particular message at a second different power level, at a second different time and on a second different carrier frequency,wherein the first and second transmission frequencies are selected substantially at random from among the different carrier frequencies of the plurality.
1 Assignment
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Accused Products
Abstract
Multiple diversity used in a fading or shadowed error prone, framed, random access channel enhances the probability of successful transmission and reduces delays. This is important, for example, in mobile telephone service, in which traffic channels are only assigned on a speech spurt basis. Selected control messages (such as reverse allocation requests and deallocation requests) are transmitted with multiple diversity. More particularly, an identical control message is transmitted at multiple instants in time (such as three), each transmission occurring on a different carrier frequency, and each transmission occurring at a randomly selected power level.
38 Citations
20 Claims
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1. A method for transmitting messages on any of a predetermined plurality of different carrier frequencies comprising:
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transmitting a particular message from one station to another station at a first power level, at a first time and on a first carrier frequency; and transmitting the particular message at a second different power level, at a second different time and on a second different carrier frequency, wherein the first and second transmission frequencies are selected substantially at random from among the different carrier frequencies of the plurality.
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2. A method for transmitting messages on any of a predetermined plurality of different carrier frequencies comprising:
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transmitting a particular message from one station to another station at a first power level, at a first time and on a first carrier freguency; and transmitting the particular message at a second different power level, at a second different time and on a second different carrier frequency, wherein the first and second transmission times are selected substantially at random from among a range of acceptable transmission times.
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3. A method for transmitting messages on any of a predetermined plurality of different carrier frequencies comprising:
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transmitting a particular message from one station to another station at a first power level, at a first time and on a first carrier frequency; and transmitting the particular message at a second different power level, at a second different time and on a second different carrier frequency, wherein the first and second power levels are selected substantially at random from among a range of acceptable power levels.
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4. A method for transmitting messages on any of a predetermined plurality of different carrier frequencies comprising:
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transmitting a particular message from one station to another station at a first power level, at a first time and on a first carrier frequency; and transmitting the particular message at a second different power level, at a second different time and on a second different carrier frequency, wherein each of the plurality of carrier frequencies comprises a plurality of time slots, and wherein transmitting the message at a plurality of different times comprises transmitting the message in a plurality of different slots, and wherein the step of transmitting a particular message comprises transmitting a slot assignment for identifying a particular slot and further comprising the step of transmitting an information packet in the identified slot, and wherein each slot comprises a plurality of subslots, the slot assignment being carried in a subslot of a slot which does not carry the information packet.
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5. In a radio telephony system having a plurality of transmitting stations for transmitting information packets to other stations, wherein each information packet is transmitted in one of a plurality of carrier frequency channel slots and wherein some of the slots carry control messages independently of the information packets for controlling the transmission of the information packets between stations, a method for transmitting the control messages comprising:
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transmitting a particular control message independently of any information packet from one station to another station in a first slot at a first time and a first carrier frequency the particular control message relating to a particular information packet; and transmitting the particular control message independently of any information packet in a second slot at a second different time and a second different carrier frequency; and transmitting the particular information packet in a third slot. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A method for transmitting an information burst from a controlling radio telephony station to a controlled radio telephony station comprising:
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detecting the burst for transmission from the controlling station to the controlled station; transmitting, independently of the burst, on a plurality of predetermined carrier frequency channels at a plurality of different times, a radio channel assignment to the controlled station for indicating to the controlled station the channel upon which the burst will be transmitted; and transmitting the burst on the indicated channel from the controlling station to the controlled station. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method for transmitting an information burst from a controlled radio telephony station to a controlling radio telephony station comprising:
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detecting the burst for transmission from the controlled station to the controlling station; transmitting from the controlled station, on a plurality of predetermined carrier frequency channels at a plurality of different times, a channel allocation request; transmitting, on a plurality of predetermined carrier frequency channels at a plurality of different times, a radio assignment to the controlled station for indicating to the controlled station the channel upon which the burst will be transmitted; transmitting the burst on the indicated channel from the controlled station to the controlling station. - View Dependent Claims (18, 19, 20)
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Specification