Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
2000-08-02
2003-09-23
Maung, Nay (Department: 2684)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S011100, C455S456500, C455S461000
Reexamination Certificate
active
06625462
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a method of establishing a radio link between subscribers of a telecommunications network, in particular in a decentralized mobile radio network with mobile radio sets serving both as terminals and as transmitters.
Furthermore, the invention relates to a telecommunications network, in particular a decentralized mobile radio network with mobile radio sets serving both as terminals and as transmitters.
Methods of the kind under discussion are known in connection with radio networks, such as, for example, the mobile radio networks known as C-, D1-, D2, and E-plus networks. Furthermore, telecommunications networks of the kind under discussion are known from practice. For establishing a radio link, the known telecommunications networks comprise stationary radio equipment in the form of stationary transmitters. The establishment of a radio link occurs by means of external switching methods within the scope of an external radio network management. The localization of the network subscribers and the establishment of a link between the network subscribers occurs in these mobile radio networks by means of the central switching equipment.
In the establishment of a radio link, the central transmitters play the fundamental part, since they are in a constant, reciprocal contact with the network subscribers via a division of the radio network into individual network cells. Thus, the respective transmitter always knows the location of the network subscriber by its response to the transmitter and furthermore to the network control center.
When a radio link is established between two network subscribers, the network subscribers are first localized by means of the central switching method. Subsequently, the radio link between the network subscribers is computed or determined, and then offered. In this connection, the preliminary computation or determination of the communication path via possible relay links is named “routing.”
The known methods operate between the mobile radio sets and the stationary transmitters of the respective network cells of the known radio networks. In the case of the known radio networks of this kind, it is thus essential that external and centrally controlled methods be applied, which are operated mainly from an external operator station—for example, a central operating computer—outside of the individual mobile radio sets or radio terminals.
Besides these known methods and telecommunications networks with stationary transmitters, it is also known to use methods and telecommunications networks, which are totally decentralized, and which use mobile radio sets both as terminals and as transmitters. In this instance, stationary transmitters, which are centrally controlled, are omitted. Note, in particular Applicant's Application No. 195 35 021.9 filed in Germany, which describes a radio network that employs mobile radio sets both as terminals and as transmitters. The described radio network is designed as a neural network, which is totally selfmanaging and selfcontrolling.
Without limitation to this type of network, the present invention is described by way of the aforesaid neural network, wherein the mobile radio sets serve both as terminals and as transmitters. In this system, stationary network cells are no longer formed. While it is thus no cellular system, it comprises identical, dynamic neighborhood areas of each subscriber. The size of such a substantially circular neighborhood area around an observed subscriber is dimensioned by that distance from the observed subscriber, in which the radio communication of the observed subscriber can still be monitored by another, neighboring subscriber. In the case of an unimpeded radio wave propagation, this distance is the radius of the neighborhood area. In the case of radio interferences or radio obstructions, the neighborhood area may also assume a shape that deviates from a circle.
The size of a neighborhood area continues to be dependent on the radio coverage. During a movement of the observed subscriber, the neighborhood area moves along with the subscriber. Therefore, the telecommunications network under discussion, is a real, totally mobile network. Mobile networks can otherwise be realized only by investment-cost-intensive mobile satellite network systems. This radio network is a distribution network without a centralized switching service. Switching is automatically and collectively performed by one or more subscribers after calling a destination subscriber.
An active subscriber—the source subscriber—forms a network relay link with one of its next neighbors, with which it establishes a direct radio contact. Unless they are the called destination subscribers, these neighbors serve as transmitters. Between the source subscriber and the destination subscriber, the radio link may occur via a plurality of transmitters. In this instance, the network link will consist of a plurality of network relay links between the individual transmitters.
To localize and address the subscribers, the subscribers receive a position identification, which can be actualized after certain time intervals. The position identification is known to each subscriber via an address directory, or it is stored in the mobile radio set. This position identification is useful in a destination-directed establishment of a radio link, since it makes it possible to prevent a radio call from propagating like an avalanche for purposes of establishing a radio link. Instead, it can be approximately predetermined in the direction toward the destination receiver. Such a method of establishing a radio link has already been disclosed in Applicant's German Application 197 26 956.7.
In the stage of development of the above described neural telecommunications network until now in part quasi stationary transmitters are provided, which are formed by a functional part of a mobile radio set. Each user has a mobile radio set, which consists of a terminal element and a spatially separable transmitter element. This transmitter element is stationarily installed at the user as a quasi stationary base transmitter with a fixed position identification. With that, not only all radio links of the user, but also any radio links of other subscribers can occur via the user-associated transmitter element or via transmitter elements of other subscribers.
Besides the position identification, a subscriber also disposes of a subscriber-specific identification. This could be, for example, the name of the user.
In the case of constantly stationary subscribers, it possible to establish a radio link exclusively by way of the position identification. As soon as the subscriber moves with its terminal element, this will no longer be possible at first sight, since the subscriber has left the position known to the other subscribers, and since the other subscribers then do not yet know the new position of the destination subscriber. However, a movement of the destination subscriber within the neighborhood area of the transmitter nearest to it in the radio chain is noncritical, since the destination subscriber can hear the radio call of this nearest transmitter, and identify itself as destination subscriber via the subscriber-specific identification. With that, it is possible to establish the radio link in full.
In such a telecommunications network, an establishment of a radio link or an offered radio link remains likewise unaffected by a movement of the subscriber, as long as the neighborhood areas of the subscribers of a radio link chain or the transmitters overlap in part. In other words, a radio link or an establishment of a radio link remains possible as long as the destination subscriber is located with its terminal element within the neighborhood area of any transmitter of the radio link chain. This can be explained by the fact that during its transmission work, each transmitter also transmits the complete address of the destination subscriber—position identification and subscriber-specific identification—and the destination subscriber
Alston & Bird LLP
IP2H AG
Maung Nay
Orgad Edan
LandOfFree
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