Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1998-12-16
2002-09-24
Urban, Edward F. (Department: 2685)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S011100, C455S013100
Reexamination Certificate
active
06456853
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a method of establishing a radio link between at least two subscribers of a digital relay radio network.
Methods of the kind under discussion are known in connection with radio networks, such as, for example, C, D1, D2, and E-plus mobile radio networks. To this end, the known networks comprise stationary radio equipment in the form of relay stations. The establishment of a radio link occurs by means of external switching methods within the scope of an external radio network management. In these mobile radio networks, the localization of the subscribers and the connection between the subscribers occurs by means of a central switching equipment.
When establishing a radio link, the central relay stations play a basic role, since they are in a constant mutual contact with the network subscribers, in that the radio network area is divided into individual network cells. Thus, the location of the network subscriber is always known to the respective relay station as a result of its response to the relay station, and furthermore to the network central.
When a radio link is established between two network subscribers, same are initially localized by means of the central switching method. Subsequently, the radio link between the network subscribers is computed or determined and then offered. The preliminary computation or determination of the connection path via possible stages is named “routing.”
The known methods operate between mobile radio sets and stationary relay stations of the respective cells of the known radio networks. Thus, in the case of the known radio networks, it is essential that externally and centrally controlled methods be applied, which are essentially used by an external operator station—for example, a central operational computer—outside of the individual mobile radio sets or radio terminals.
The known methods of establishing a radio link within the known radio networks, present the problem that the establishment of a radio link always requires stationary transmission relays or relay stations. From this follows, that when a radio network of the known type is set up or newly build up, it will first be necessary to build up an area covering network of stationary relay stations. This greatly reduces the flexibility of a network system with respect to a new implementation.
It is therefore the object of the present invention to describe a method of establishing a radio link of the kind under discussion, which facilitates in a simple manner establishing a radio link even in a network without stationary relay stations.
SUMMARY OF THE INVENTION
The above and other objects and advantages of the present invention are achieved by the provision of a method of establishing a radio link between at least two network subscribers, wherein an individual location dependent position identification is assigned to each of the individual network subscribers so that the position of all network subscribers may be determined relative to each other.
As a result of assigning position identifications relative to one another it is possible to build up in steps a radio link from network subscriber to network subscriber. It is no longer necessary to provide separate, stationary relay stations. To build up a radio link, a source subscriber must know only its own position identification and the position identification of the destination subscriber. The radio link will then be established between the source subscriber and the destination subscriber via further network subscribers that are able to retransmit in a purposeful manner, due to the knowledge of their own position identification, a radio signal that is emitted by the source subscriber to the destination subscriber.
A relay radio network in which the method of the present invention may be used is known from German Patent Application 195 35 021.9. This Application discloses a relay radio network that consists of individual, mobile radio sets, which serve both as terminal equipment and as a relay. As a result of assigning a position identification in accordance with the invention, it is possible to address in the known relay radio network the network subscribers in a location-dependent and direction-dependent manner and to interconnect same in a destination-directed or directional manner.
In the invention, localization of the network subscriber and assigning a radio path between the network subscribers are not exactly realized by means of stationary relay stations and established radio network cells. While building up the radio link, the direction of the radio path to the desired destination subscriber is predetermined by determining in steps, with a tendency in terms of direction, successive stages of the radio path via further network subscribers. While the radio link is built up or offered, same is definitively determined only when the last stage of the radio path is established. This may result in that possibly several stages of the radio path are selected simultaneously, and that a multipath propagation occurs or a plurality of parallel radio links build up.
Consequently, the method of the present invention specifies a method of establishing a radio link, which facilitates in a simple manner establishing a radio link even in a network without stationary relay stations.
As regards a simple buildup of a radio link, it will be advantageous, when the network subscribers participating in a setup of a radio link know their position identification for comparison with the position identification of other network subscribers. To this end, the respective network subscribers could store the position identification assigned to a network subscriber.
With respect to an especially simple assignment of position identifications, it would be possible to determine the position relative to radio signal emitting signal transmitters with a predeterminable location. To this end, at least three radio signal transmitters may be provided. The radio signal transmitters could emit the radio signals at certain instants or after certain time intervals. As a result of receiving the radio signals by the predeterminable locations, it becomes possible to determine in a simple manner the position of the receiving network subscriber relative to the radio signal transmitters. This enables a clear position identification and a clear assignment of a position identification.
A particularly reliable assignment of location-dependent position identifications. could be realized, when the radio signal transmitters are arranged distributed over the radio network area at the boundary thereof. In this instance, the radio signal transmitters may not be collinear.
As regards a reliable transmission or a reliable reception of the radio signals, the network subscribers could receive the radio signals transmitted directly from the radio signal transmitters or via other network subscribers. In other words, all network subscribers are also used as transmitters of the radio signals for assigning a position identification. In this connection, the radio signals of the signal transmitters could be retransmitted like an avalanche by the network subscribers serving as transmitters.
Having in mind a particularly clear distinction of the radio signals from different signal transmitters, the radio signals from the signal transmitters could be retransmitted during the retransmission at a transmitter-dependent or predeterminable delay time. This would make it possible to clearly improve the resolution of received radio signals from spatially closely adjacent radio signal transmitters that transmit, however, via different network subscribers.
The radio signal transmitters could transmit radio signals at certain time intervals, possibly monthly, or even at substantially shorter time intervals. The radio signals could be time synchronization signals, which are retransmitted like an avalanche by all transmitters in the relay radio network. Such an avalanchelike retransmission could occur according to the radio reception procedure without relay switching,
Alston & Bird LLP
Gesesse Tilahun
IP2H AG
Urban Edward F.
LandOfFree
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