Radio transmission method for digital multimedia data signals between subscriber stations in a local network
First Claim
1. Radio transmission method for digital multimedia data signals between a plurality of subscriber stations, each having a transmitter and a receiver, in a local network, in particular an indoor network, using a mixed frequency and time division multiplex method FDMA (Frequency Division Multiple Access)/TDMA (Time Division Multiple Access), in which a relatively broad frequency band is divided according to the FDMA method into a plurality of carrier frequency ranges, namely the so-called main channels, and a plurality of time slots, namely the so-called sub-channels, distributed in a frame structure, are formed on each carrier frequency level according to the TDMA method, characterized in that a limited number of main channels, but at least one, is assigned to a grouping, that is to say a so-called cluster, of subscriber stations, in that a main channel signal is distributed between the one or more sub-channel signals which are associated with a cluster and which are transmitted using the TDMA method, in that each transmitter of an activated subscriber station transmits a detectable check signal, in its transmissions, and in that, on the basis of detection of this check signal in the respective receiver, other, newly activated subscriber stations determine the presence of transmit signals within a specific, spatially limited range, namely their own respective transmission range, and wherein in case a main channel for the cluster to which the checking subscriber station belongs has been detected, and this main channel has enough unoccupied transport capacity for the planned transmissions of the checking subscriber station, the corresponding time slot/s of the main channel are seized from the checking subscriber station, and wherein in the case that a main channel has not been detected for the cluster to which the checking subscriber station belongs, or in the case that the detected main channel cannot provide the required transport capacity for the planned transmissions of the checking subscriber station, a new, unoccupied main channel is seized by the checking subscriber station for the cluster.
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Abstract
In the radio transmission method according to the invention, which operates with a mixed frequency and time division multiplex method FDMA/TDMA, in which a relatively broad frequency band is divided according to the FDMA method into a plurality of carrier frequency ranges, namely the so-called main channels, and a plurality of time slots, namely the so-called sub-channels, distributed in a frame structure, are formed on each carrier frequency level according to the TDMA method, a grouping, that is to say a so-called cluster, of subscriber stations is assigned a limited number of main channels. A main channel signal is divided into one or more sub-channel signals which are associated with a cluster and which are transmitted using the TDMA method. Each transmitter of an activated subscriber station transmits a detectable check signal, so that, on the basis of detection of a check signal in the respective receiver, other, newly activated subscriber stations can determine the presence of transmit signals which are present within a specific, spatially limited range, namely their own respective transmission range. The method according to the invention can be used for transmitting information between terminals in indoor networks in a wireless manner without a central station.
108 Citations
66 Claims
- 1. Radio transmission method for digital multimedia data signals between a plurality of subscriber stations, each having a transmitter and a receiver, in a local network, in particular an indoor network, using a mixed frequency and time division multiplex method FDMA (Frequency Division Multiple Access)/TDMA (Time Division Multiple Access), in which a relatively broad frequency band is divided according to the FDMA method into a plurality of carrier frequency ranges, namely the so-called main channels, and a plurality of time slots, namely the so-called sub-channels, distributed in a frame structure, are formed on each carrier frequency level according to the TDMA method, characterized in that a limited number of main channels, but at least one, is assigned to a grouping, that is to say a so-called cluster, of subscriber stations, in that a main channel signal is distributed between the one or more sub-channel signals which are associated with a cluster and which are transmitted using the TDMA method, in that each transmitter of an activated subscriber station transmits a detectable check signal, in its transmissions, and in that, on the basis of detection of this check signal in the respective receiver, other, newly activated subscriber stations determine the presence of transmit signals within a specific, spatially limited range, namely their own respective transmission range, and wherein in case a main channel for the cluster to which the checking subscriber station belongs has been detected, and this main channel has enough unoccupied transport capacity for the planned transmissions of the checking subscriber station, the corresponding time slot/s of the main channel are seized from the checking subscriber station, and wherein in the case that a main channel has not been detected for the cluster to which the checking subscriber station belongs, or in the case that the detected main channel cannot provide the required transport capacity for the planned transmissions of the checking subscriber station, a new, unoccupied main channel is seized by the checking subscriber station for the cluster.
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55. Radio transmission method for digital multimedia data signals between a plurality of subscriber stations, each having a transmitter and a receiver, in a local network, in particular an indoor network, using a mixed frequency and time division multiplex method FDMA (Frequency Division Multiple Access)/TDMA (Time Division Multiple Access), in which a relatively broad frequency band is divided according to the FDMA method into a plurality of carrier frequency ranges, namely the so-called main channels, and a plurality of time slots, namely the so-called sub-channels, distributed in a frame structure, are formed on each carrier frequency level according to the TDMA method, characterized in that a limited number of main channels, but at least one, is assigned to a grouping, that is to say a so-called cluster, of subscriber stations, in that a main channel signal is distributed between the one or more sub-channel signals which are associated with a cluster and which are transmitted using the TDMA method, in that each transmitter of an activated subscriber station transmits a detectable check signal, in its transmissions, and in that, on the basis of detection of this check signal in the respective receiver, other, newly activated subscriber stations determine the presence of transmit signals within a specific, spatially limited range, namely their own respective transmission range, and wherein in case a main channel for the cluster to which the checking subscriber station belongs has been detected, and this main channel has enough unoccupied transport capacity for the planned transmissions of the checking subscriber station, the corresponding time slot/s of the main channel are seized from the checking subscriber station, and wherein in the case that a main channel has not been detected for the cluster to which the checking subscriber station belongs, or in the case that the detected main channel cannot provide the required transport capacity for the planned transmissions of the checking subscriber station, a new, unoccupied main channel is seized by the checking subscriber station for the cluster and wherein the identifier numbers of the clusters and the subscriber stations are allocated during a marking and initialization procedure to which all the subscriber stations of a cluster are to be subjected, the subscriber stations transmit, in addition to the cluster and subscriber station identifier numbers, an equipment class number which can be selected from a specific quantity of equally long numbers and the equipment class numbers serve to distinguish between the group including at least television sets, video recorders, computers and cordless telephones, the same number also being used for other clusters, so that they cannot be used to distinguish between different clusters.
- 56. Radio transmission method for digital multimedia data signals between a plurality of subscriber stations, each having a transmitter and a receiver, in a local network, in particular an indoor network, using a mixed frequency and time division multiplex method FDMA (Frequency Division Multiple Access)/TDMA (Time Division Multiple Access), in which a relatively broad frequency band is divided according to the FDMA method into a plurality of carrier frequency ranges, namely the so-called main channels, and a plurality of time slots, namely the so-called sub-channels, distributed in a frame structure, are formed on each carrier frequency level according to the TDMA method, characterized in that a limited number of main channels, but at least one, is assigned to a grouping, that is to say a so-called cluster, of subscriber stations, in that a main channel signal is distributed between the one or more sub-channel signals which are associated with a cluster and which are transmitted using the TDMA method, in that each transmitter of an activated subscriber station transmits a detectable check signal, in its transmissions, and in that, on the basis of detection of this check signal in the respective receiver, other, newly activated subscriber stations determine the presence of transmit signals within a specific, spatially limited range, namely their own respective transmission range, and wherein in case a main channel for the cluster to which the checking subscriber station belongs has been detected, and this main channel has enough unoccupied transport capacity for the planned transmissions of the checking subscriber station, the corresponding time slot/s of the main channel are seized from the checking subscriber station, and wherein in the case that a main channel has not been detected for the cluster to which the checking subscriber station belongs, or in the case that the detected main channel cannot provide the required transport capacity for the planned transmissions of the checking subscriber station, a new, unoccupied main channel is seized by the checking subscriber station for the cluster and wherein a sequence which is known both at the transmit end and at the receive end is being transmitted within the check signal, said sequence being assigned unambiguously to the respective cluster and it being thus possible to use it to identify said cluster.
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58. Subscriber station for a local radio transmission network, using a mixed frequency and time division multiplex method FDMA/TDMA, having main and sub-channels, including a front end for receiving radio transmission signals with corresponding filter and synchronizing unit, a channel decoder and a source signal decoder as well as a control unit, characterized in that an evaluation unit for received control signals is further included which detects on the basis of said received control signals whether a data transfer belongs to a cluster being assigned to the subscriber station, wherein to a cluster a limited number of main channels, but at least one, is assigned and a main channel corresponds to a specific carrier frequency range, wherein the seizure of a main channel is carried out by the transmitter of a subscriber station only on two preconditions, namely
a) if the contingent of main channels permitted in the relevant, broad frequency band per cluster, that is to say at least one main channel, has not yet been exhausted for the original cluster, and b) if the respective main channel is not seized by a signal of another cluster located in the relatively direct vicinity.
Specification
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- Resources
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Current AssigneeThomson Licensing SA (Vantiva SA)
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Original AssigneeThomson Licensing SA (Vantiva SA)
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InventorsFazel, Khaled, Robertson, Patrick, Klank, Otto
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Primary Examiner(s)Vu, Huy D.
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Assistant Examiner(s)Harper, Kevin C.
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Application NumberUS09/003,741Time in Patent Office1,315 DaysField of Search370/345, 370/347, 370/348, 370/349, 370/350, 370/436, 370/492, 370/458, 370/459, 370/468, 370/478, 370/330, 370/445, 455/455, 455/516, 455/67.1, 455/422, 455/423US Class Current370/478CPC Class CodesH04J 4/00 Combined time-division and ...H04W 56/003 Arrangements to increase to...H04W 56/0085 detecting a given structure...
