Method and device control data transmission over the air

 

(57) Abstract:

The invention relates to radio engineering, in particular to the transmission of discrete messages, and can be used to improve the efficiency of bandwidth usage lines and radio communications networks, in particular lines and communication networks in systems of automatic dependent observations when used on data lines of a complex of technical means of data transfer. The technical result is to increase the utilization of the bandwidth of the radio channel with non-uniform traffic, and ensure there is no dependence of the average time delivery of data packets when the number of subscribers in a wide range. The technical result is achieved in that the transmission of data packets over the radio channel is carried out in accordance with the ALOHA Protocol in synchronous or asynchronous variants, and the intensity of formation of data packets and/or transmit power of the data packets is selected depending on the navigation data. 2 S. p. f-crystals, 1 Il.

The invention relates to the field of radio, namely the transmission of discrete messages. The proposed solution can be ispolzovannii and communication networks in systems of automatic dependent observations (OPA) when used on data lines of a complex of technical means of data transfer.

The closest analogue (prototype) to the claimed technical solution in part of the method is a method of managing data transmission over the air, including the reception of navigational data, the formation and transmission of data packets through at least one channel (US 5798726 And, 03.02,95).

A prototype of the claimed technical solution in part of the device is the control device for data transfer over the air, including the source of the navigation data, the output of which is connected to the input of the shaper of data packets, and the two outputs of the shaper of data packets associated with the first and second inputs of the transmitter and the decoder of the data packets, the input of which is connected with the output of the receiver (US 5798726 And 03.02.95).

The disadvantages of the known technical solutions in terms of method and devices are inefficient use of bandwidth of the radio channel with non-uniform traffic, as well as the dependence of the average time delivery of data packets from the number of subscribers that use radio ADS will lead to less accurate tracking of subscribers.

The objective of the invention is to develop a method and device control data transmission over radioman is of the bandwidth of the radio channel with non-uniform traffic, and no dependence of the average time delivery of data packets when the number of subscribers within wide limits, is that when the radio network system OPA provides for a fixed precision support subscribers.

The task in parts of the proposed method is achieved by the fact that in the known method of controlling data transmission over the radio channel, comprising receiving navigation data, the formation and transmission of data packets through at least one channel, the transmission of data packets is performed in accordance with the ALOHA Protocol in synchronous or non-synchronous versions, and the intensity of formation of data packets and/or transmit power of the data packets is selected depending on the navigation data.

The task in part of the proposed device is achieved in that in the known device control data transmission over the air containing the navigation data source, the output of which is connected to the input of the shaper of data packets, and the two outputs of the shaper of data packets associated with the first and second inputs of the transmitter and the decoder of the data packets, the input of which is connected with the output of the receiver, optional introduction the I power of transmission of data packets, and the first input of the controller of the ALOHA Protocol is connected with the output of a source of navigation data through the control unit intensity batching data when available, and an additional input of the transmitter is connected with the output of a source of navigation data through the control unit transmission power of packet data, if available, the decoder output data packets associated with the second input of the controller of the ALOHA Protocol, the output of which is connected with the control input of the shaper of data packets.

Thanks to the new essential features in terms of method and device control data transmission over the air unlike the prototype increases the utilization ratio of the bandwidth of the radio channel with non-uniform traffic, and there is no dependence of the average time delivery of data packets when the number of subscribers within wide limits, is that when the radio network system OPA provides for a fixed precision support subscribers.

The analysis of the level of technology has allowed to establish that the analogues, characterized by a set of characteristics is identical for all features of the claimed technical solution, oducti search known solutions in this and related areas of technology with the purpose of revealing of signs, match the distinctive features of the prototype of the features of the declared object, showed that they do not follow explicitly from the prior art. The prior art also revealed no known effect provided the essential features of the claimed invention transformations to achieve a technical result. Therefore, the claimed invention meets the condition of patentability "inventive step".

The inventive method and device control data transmission over the radio channel are illustrated by the drawing, which shows a structural diagram containing the navigation data source 1, the controller ALOHA Protocol 2, the shaper of data packets 3, a transmitter 4, the control unit intensity of formation of the data packet 5, the control unit transmit power of the data packet 6, the receiver 7 and the decoder of the data packets 8. Perhaps the presence of either control unit intensity of formation of data packets 5, or unit power control transmission of data packets 6, or both units at the same time. The output of the navigation data source 1 is connected with the input of the shaper of the data packets 3, two outputs which are connected with the first and second inputs of the transmitter 4, the First input controllerbase data packets 5, if available. The second input of the ALOHA Protocol controller 2 is connected with the decoder output data packets 8, the inlet of which is connected with the output of the receiver 7. The output of the ALOHA Protocol controller 2 is connected with the control input of the shaper of the data packets 3. Auxiliary input transmitter 4 is connected with the output of the navigation data source 1 via the control unit transmission power of packet data 6 when it is available.

Description of the operation of the device and a specific example of implementation of the method. The ALOHA Protocol controller 2 at random points in time, based on specified control unit intensity of formation of data packets 5 intensity of formation of data packets, generates the enable signal generation packet data input to the driver data packets 3. A packet of data containing navigation data received by the imaging unit of the data packet 3 from the navigation data source 1, for example, a receiver of satellite navigation systems GLONASS and NAVSTAR systems, and/or data received by the imaging unit of the data packet 3 from the information input, comes with driver data packets 3 transmitter 4 and transmitted with a given block power control packet data 6 to the control station. To the x selection time In the event of a collision of two or more data packets, recorded in the descending (control point - mobile subscriber line) connection, the decision on the conflict, and the conflicting subscribers assigned retransmission, and to reduce the probability of repeated conflict the beginning of the transmission is selected through a random time interval. For this purpose adopted in the downlink data packet arrives from the receiver 7 and the decoder of the data packets 8, where the data packet is allocated a sign of conflict when receiving a control station transmitted data packet. This signal about the conflict comes in the ALOHA Protocol controller 2, which performs retransmission of the data packet until then, until there is no sign of conflict.

S=Ge-2G, (1)

where S is the average throughput;

G - average traffic,

for a synchronous version of the ALOHA Protocol

S=Ge-G, (2)

and

G = T, (3)

where is the intensity of formation of data packets;

T is the duration of transmission of each data packet;

(N. Abramson, " The Throughput of Packet Broadcasting Channels, IEEE Transactions on Communications, Vol. COM-25, No. 1, January 1977, p. 118).

Expressions (1) and (2) allow to get the third is the assumption of mutual destruction conflicting data packets. However, in radio, there is the phenomenon of capture participating in the electoral reception of one of the groups simultaneously supplied to the input signals. In networks based on simple data transfer signals, the capture phenomenon is manifested in the successful reception of the signal power exceeds the desired value of the total power of the other competing signals. If all subscribers have the same transmitter power, the signal power at the receiving end will be monotonically decreasing with increasing distance to the subscriber.

You know the expression to determine the density distribution of traffic for the case of perfect capture (such property has, for example, a frequency discriminator and a constant density medium speed packet data

< / BR>
where G(r) is the density distribution of the traffic (normalized traffic per unit square of the distance r from the point of admission);

S0=G(0) is the density of traffic at the point of reception;

r is the distance to the point of reception;

(N. Abramson, " The Throughput of Packet Broadcasting Channels, IEEE Transactions on Communications, Vol. COM-25, No. 1, January 1977, p. 124). Thus, to ensure not dependent on the distance to the receiving point density, average speed, you must change the traffic in sabyrkulovna packet data:

< / BR>
where L(r) is the density distribution of the intensity of formation of data packets (full intensity of the formation of data packets per unit square of the distance r from the point of admission).

The independence of the density of the average velocity on the distance from the subscriber to the point of reception provides the same average time delivery of data packets to subscribers located at any distance from the point of reception within the coverage area of the radio network. With regard to radio ADS running in accordance with the Protocol multiple access ALOHA, this will mean that the accuracy of the maintenance of the subscriber within the coverage area of the radio network will not depend on the distance from the subscriber to the point of reception.

At a constant length packet data T management network traffic with ALOHA Protocol can be implemented by changing the intensity of the formation of data packets depending on the distance from the subscriber to the point of reception. If the subscriber of the navigation data source 1 that defines the location of the subscriber, and at known coordinates of the point of receiving this distance can be easily calculated.

When working subscribers in terms of Radiostantsiya, for example the transmission of data packets) depends not only on the distance to the subscriber, but also from shading. To compensate for this dependence, you want to control the transmit power of the data packets depending on the location of the subscriber. The dependence of the power transmission of data packets from the subscriber location is chosen such that at the point of reception she monotonously decreased with increasing distance to the subscriber and is not dependent on the azimuth of the subscriber. The subscriber's location is again determined on the basis of the navigation data from the navigation data source 1.

To provide intensity control of the formation of data packets and/or transmit power of the data packets depending on the location of the subscriber navigation data from a navigation data source 1 goes into the control unit of intensity of formation of data packets 5 and/or the control unit transmission power of packet data 6.

The intensity of formation of data packets in the control unit intensity of formation of the data packet 5 is chosen so that the average packet delivery time data is not dependent on the location of the subscriber, for example, guided by the following considerations.

Suppose the system is known colchesterarea subscribers (number of subscribers per unit area) is n/D. Dividing by this value, the density value of the intensity of formation of data packets dependent on distance from the subscriber to the dispatch of paragraph (5), we obtain the intensity value of the formation of data packets to the subscriber at a distance r from the control tower received from the control unit intensity of formation of the data packet 5 to the controller of the ALOHA Protocol 2.

The transmit power of the data packets in the block power control packet data 6 select, for example, so that at the point of reception she monotonously decreased with increasing distance to the subscriber and is not dependent on the azimuth of the subscriber.

1. The method of controlling data transmission over the radio channel, comprising receiving navigation data, the formation and transmission of data packets through at least one channel, wherein the transmission of data packets is carried out in accordance with the ALOHA Protocol in synchronous or asynchronous variants, and the intensity of formation of data packets and/or transmit power of the data packets is selected depending on the navigation data.

2. The control device for data transfer over the air, including the source of navigation data, o is s with the first and second inputs of the transmitter, and the decoder of the data packets, the input of which is connected with the output of the receiver, characterized in that it is provided with a controller ALOHA Protocol, the control unit intensity of formation of data packets and/or block power control transmission of data packets, and the first input of the controller of the ALOHA Protocol is connected with the output of a source of navigation data through the control unit intensity batching data when available, and an additional input of the transmitter is connected with the output of a source of navigation data through the control unit transmission power of packet data, if available, the decoder output data packets associated with the second input of the controller ALOHA Protocol, the output of which is connected with the control input of the shaper of data packets.

 

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