Telecommunications – Carrier wave repeater or relay system – Portable or mobile repeater
Reexamination Certificate
1998-04-17
2001-10-16
Hunter, Daniel (Department: 2684)
Telecommunications
Carrier wave repeater or relay system
Portable or mobile repeater
C455S445000
Reexamination Certificate
active
06304745
ABSTRACT:
TECHNICAL FIELD
This invention relates to a method of establishing a radio chain consisting of at least two radio links, between a calling radio station and a called radio station in a radiocommunications network, having first steps in which a list is created for the calling radio station information on radio links to neighboring radio stations.
It is also directed to a radiocommunications network comprising a number of radio stations wherein, to establish a radio chain consisting of at least two radio links to a called radio station, a calling radio station accesses a memory which holds a list for the calling radio station containing information on radio links to neighboring radio stations.
It is still further directed to a radio station for a radiocommunications network comprising a number of radio stations which is a called radio station and which, to establish a radio chain consisting of at least two radio links to a called radio station, accesses a memory which holds a list for the calling radio station containing information on radio links to neighboring radio stations.
BACKGROUND OF THE INVENTION
A method of establishing a radio chain in a radiocommunications network is known from DE 39 08 940 A1. The radio chain contains a number of radio stations, each of which has at least one neighboring station with which it is in direct radio communication. Several pairs of channels are available for duplex radio transmissions between the stations. Prior to the establishment of a radio chain with at least two radio links, the calling station checks all channels to see whether they are free, and creates a so-called channel occupancy list. This list contains information on radio links to the neighboring stations, namely the numbers of the free channels on which radio links can be established to the neighboring stations. To establish a radio link to a called station, the calling station, besides having its own channel occupancy list, also receives the channel occupancy lists of those neighboring stations which serve as relay stations in the radio chain. In the known radiocommunications network, the calling station must evaluate all channel occupancy lists to be able to establish a radio chain. The evaluation of the lists is not described in DE 39 08 940 A1. In addition, each station must have a scanning receiver to be able to determine which channels are free for the establishment of the radio chain. The known method can only be carried out in a multichannel radiocommunications network.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a method of establishing a radio chain which can be carried out by radio stations of simple construction. Moreover, a radio station suitable for carrying out the method and a radiocommunications network with such a radio station are to be provided.
The object is attained by a method of establishing a radio chain, consisting of at least two radio links, between a calling radio station and a called radio station in a radiocommunications network, having first steps in which a list is created for the calling radio station containing information on radio links to neighboring radio stations, further having steps in which the list is extended step by step by adding information on radio links to the radio stations adjacent to the neighboring radio stations until information is entered in the list on a radio link which leads to the called radio station.
The object is also attained by a radiocommunications network comprising a number of radio stations wherein, to establish a radio chain consisting of at least two radio links to a called radio station, a calling radio station accesses a memory which holds a list for the calling radio station containing information on radio links to neighboring radio stations, wherein the memory also contains information on radio links to radio stations adjacent to the neighboring radio stations, by addition of which information the list is extended step by step up to and including the information on a radio link which leads to the called radio station.
The object is still further attained by a radio station for a radiocommunications network comprising a number of radio stations which is a called radio station and which, to establish a radio chain consisting of at least two radio links to a called radio station, accesses a memory which holds a list for the calling radio station containing information on radio links to neighboring radio stations, wherein the memory also contains information on radio links to radio stations adjacent to the neighboring radio stations, by addition of which information the list is extended step by step up to and including the information on a radio link which leads to the called radio station.
According to the invention, to establish a radio chain consisting of at least two radio links, the list created for the calling radio station, which already contains information on radio links to neighboring radio stations, is extended step by step by adding information on radio links to radio stations adjacent to the neighboring radio stations until information is entered in the list on a radio link which leads to the called radio station.
In this manner, the calling station needs to access only one list to obtain all information required to establish the radio chain. The list created by the method according to the invention contains no superfluous information on those radio links which could not be part of the radio chain. The method works alike in all radio stations. The radio station according to the invention requires no scanning receiver. The radiocommunications system can also be a single-channel system. The method according to the invention can be carried out both in a decentralized radiocommunications network and in a centralized network.
According to one dependent claim, it is particularly advantageous to form from the extended list a shortened list which only contains information for a short radio chain with as few radio links as possible.
Further advantageous features of the invention are defined in the other dependent claims.
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Alcatel
Corsaro Nick
Hunter Daniel
Ware Fressola Van der Sluys & Adolphson LLP
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