Arrangement with a number of units that can communicate with each other via a wireless connection system and a method for use with such a system
First Claim
1. An arrangement with a number of units that can communicate with each other via a wireless connection system for transmission of messages which comprise control informations (commands) and/or data, and wherein the units have access to an actual transmission medium in sequential time intervals, at the intervals of which the units can be actuated for their respective transmissions and receptions by means of a time slot system, characterized by one or both of the following alternatives;
- a) in that the arrangement comprises a network area, in which the units exercise their communication in a network, in that the respective unit is adapted to identify and receive information related to a radio protocol including ruels for time slots and selection of frequencies in the time slot system and information of a used type of a time reference system, for example GPS, valid for the arrangement, in that the arrangement also includes an reference time area, which works with the said time reference system, in that at least one unit is adapted to identify said reference time area and synchronize itself to the reference time by means of said type information, in that said at least one unit is adapted to set its own internal clock in dependence of the reference time and to cause a time generating function in the communications between the units within the network area, and in that the reference time in such a way is adapted to be separated or independent from said communications of the units in the network, b) in that first units are adapted to establish or be included in two or more geographically separated local networks, in that respective local network includes a reference time area, in that respective reference time area is adapted with a time reference system, for example GPS, selected among a number of possible time reference systems, and in that respective unit of second units comprises or constitutes a mobile unit in a stationary local network or a mobile or stationary unit in a mobile network, in that the respective unit of the second units is adapted to identify respective reference time area a and receive information about its valid type of the time reference system, and in that at least one of said second units is adapted to have its internal clock set or being actuated by said reference time, which in such a way is adapted to be separated from or independent of the communications of the units in respective network.
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Accused Products
Abstract
An arrangement comprises a number of units that can communicate with each other via at least one wireless connection system for the transmission of messages. The connection system works with first and second reception areas. A time slot system is established in a first reception area, in which system the units have access to the transmission media in question in allocated and sequential time intervals, during which the units are activated for their respective transmissions and receptions using time information executed in the time slot system, which time information refers to one or more reference times utilized in the time slot system. The means for effecting the time slot system and the respective unit concerned which is located outside the reception area can receive the said time information signals determining the reference time or reference times, which time information signals are obtained from a master time generation system with the second reception area which is larger or smaller than the first reception area. In this way, the said unit can receive the said time information signal and prepare itself completely or partially for tuning to the said time slot system before it enters into or is covered by the first reception area.
81 Citations
46 Claims
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1. An arrangement with a number of units that can communicate with each other via a wireless connection system for transmission of messages which comprise control informations (commands) and/or data, and wherein the units have access to an actual transmission medium in sequential time intervals, at the intervals of which the units can be actuated for their respective transmissions and receptions by means of a time slot system, characterized by one or both of the following alternatives;
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a) in that the arrangement comprises a network area, in which the units exercise their communication in a network, in that the respective unit is adapted to identify and receive information related to a radio protocol including ruels for time slots and selection of frequencies in the time slot system and information of a used type of a time reference system, for example GPS, valid for the arrangement, in that the arrangement also includes an reference time area, which works with the said time reference system, in that at least one unit is adapted to identify said reference time area and synchronize itself to the reference time by means of said type information, in that said at least one unit is adapted to set its own internal clock in dependence of the reference time and to cause a time generating function in the communications between the units within the network area, and in that the reference time in such a way is adapted to be separated or independent from said communications of the units in the network, b) in that first units are adapted to establish or be included in two or more geographically separated local networks, in that respective local network includes a reference time area, in that respective reference time area is adapted with a time reference system, for example GPS, selected among a number of possible time reference systems, and in that respective unit of second units comprises or constitutes a mobile unit in a stationary local network or a mobile or stationary unit in a mobile network, in that the respective unit of the second units is adapted to identify respective reference time area a and receive information about its valid type of the time reference system, and in that at least one of said second units is adapted to have its internal clock set or being actuated by said reference time, which in such a way is adapted to be separated from or independent of the communications of the units in respective network. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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- 34. An arrangement for establishing a common global time-keeping for a system, characterized in that each node incorporated in the system is allocated a local time that can either be the same as or related to a global time, that a schedule is drawn up for a number, preferably all, of the nodes in the system, which schedule has time slots referring to the global time for transmission and reception of messages, and that the time slots are distributed to each node that are allocated the messages that the node is intended to transmit or receive in such a way that receivers and destinations(s) for the majority of all messages can be determined only from knowledge of the system'"'"'s schedule, the common global time keeping and the time slot in which the message is sent.
- 39. An arrangement comprising units incorporated in the network system, characterized in that the units are able to be connected to the network system by means of a time base that is common to the network system, which time base lacks geographical relationship to the network'"'"'s radio coverage, that the time base emanates from a time generation source that is completely independent in relation to the network, for example the GPS system, that parts of a utilized network protocol necessary for radio communication between the units, for example time slots and frequencies associated with these, are related to the reference time by means of algorithms, that is for a given time, which makes it possible for the relevant frequency and time slot to be calculated.
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45. An arrangement with a number of units which can communicate with each other via a wireless connection system for the transmission of messages with control information data (commands) and/or process data where the connection system works with a first reception area and a time slot system established in this by some means, in which time slot system the units have access to the relevant transmission media in allocated and sequential time intervals (time slots), in which intervals the units are activated for their transmissions or receptions by means of time information executed in the time slot system, referring to one or more reference times utilized in the time slot system, characterized in that the said reference time(s) emanate secondarily from master time generation that is arranged within a second reception area located inside the first reception area, that a unit that is located or ends up outside the first reception area (due to variation and/or movement of the first reception area and/or movement of the unit), obtains reference time indication when the unit is covered by the first reception area or enters into the first reception area, and that updating and maintaining of the accuracy of the first area'"'"'s reference time(s) can be effected by one or more mobile units entering, being covered by or being located in the second reception area at least temporarily for a predetermined minimum interval of time, and obtaining for other mobile units in the first reception area updated reference time(s) that can be transformed.
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46. A method of connecting units to a network system, characterized by:
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a) obtaining a given protocol for the system, b) synchronization of the system'"'"'s global time and c) in the case where allocated time slots are obtained in accordance with a), transmission/reception according to the protocol commences directly, or in the case where allocated time slots are not obtained, these are obtained according to rules in accordance with a) and transmission/reception according to the protocol can thereafter commence.
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Specification