NO167070B

NO167070B - RADIO TELEPHONE NETWORK.

Info

Publication number: NO167070B
Application number: NO854092A
Authority: NO
Inventors: Hans-Peter Ketterling
Original assignee: Bosch Gmbh Robert
Priority date: 1984-11-15
Filing date: 1985-10-15
Publication date: 1991-06-17
Also published as: DE3441722A1; ATE75574T1; NO167070C; DK172872B1; EP0182027B1; EP0182027A3; DE3441722C2; ES8701448A1; FI854005A0; DK526585A; ES548952A0; FI78801C; NO854092L; FI78801B; FI854005L; DE3585942D1; DK526585D0; EP0182027A2

Abstract

The radiotelephone network covers a district divided into cells, in which mobile radiotelephones are located. Each cell has a fixed radio station, and a plurality of fixed radio stations are connected to a common mobile switching centre. To avoid overloading a cell (FZ1), the mobile switching centre (FV1) constantly traces the number of mobile radiotelephones (M1, M2) located in each cell (FZ1, FZ2). If the mobile switching centre determines that the maximum permissible number of mobile radiotelephones is exceeded in a cell, it assigns to the mobile radiotelephones exceeding this number one or more other cells (FZ5, FZ8) or fixed radio stations (B5, B8). <IMAGE>

Description

Oppfinnelsen angår et radiotelefonnett av den art som angitt i innledningen til krav 1. The invention relates to a radiotelephone network of the type stated in the introduction to claim 1.

Det er kjent et radiotelefonnett ("Funkschau", 1984, hefte 7, side 57) ved hvilket radloområdet blir oppdelt i radioceller. Hver radiocelle er tilordnet en stedfast radiosende-og mottagerstasjon, 1 det følgende kalt stedfast radiostasjon. Flere stedfaste radiostasjoner er forbundet med en felles radloformldlingssentral. Innenfor det totale radloområdet, opererer mobile radiosende- og mottakerstasjoner, i det følgende kalte mobile radiostasjoner, som kan sette seg 1 forbindelse med en telefonabonnent eller en annen radiotelefon via en stedfast radiostasjon tilsvarende den mobile telefonens oppholdssted. Ved radioformidlingssentralen hhv. i et elektronisk lager tilordnet denne, blir de respektive oppholdsstedene og telefonnumrene til de mobile radiotelefonene lagret for å kunne realisere de respektive ønskede forbindelsene. A radiotelephone network is known ("Funkschau", 1984, volume 7, page 57) by which the radlo area is divided into radio cells. Each radio cell is assigned to a fixed radio transmitting and receiving station, 1 hereafter called a fixed radio station. Several fixed radio stations are connected to a common radio communication center. Within the total radlo area, mobile radio transmitting and receiving stations operate, hereinafter called mobile radio stations, which can establish a connection with a telephone subscriber or another radio telephone via a fixed radio station corresponding to the mobile telephone's location. At the radio broadcasting center or in an electronic warehouse assigned to this, the respective locations and telephone numbers of the mobile radio telephones are stored in order to be able to realize the respective desired connections.

Fra US-patent nr. 4 144 412 er kjent et radiotelefonnett hvor antall aktive mobile radiotelefoner til hver radiocelle overvåkes. Blir i en radiocelle tillatelig antall mobile radiotelefoner overskredet, så blir dette antall overskredne radiotelefoner tilordnet en annen radiocelle eller flere andre radioceller og fortrinnsvis den radiocellen som er tilliggende den overbelastede. Ved dette kjente radiotelefonnettet finner det imidlertid sted en tilordning av radiotelefonen til en annen radiocelle når det sendes ut et anrop. Anropes den, eller befinner den seg 1 beredskap, så er det ikke mulig med en tilordning til en annen radiocelle. From US patent no. 4 144 412 a radio telephone network is known where the number of active mobile radio telephones for each radio cell is monitored. If the permissible number of mobile radio telephones in a radio cell is exceeded, this number of exceeded radio telephones is assigned to another radio cell or several other radio cells and preferably to the radio cell which is adjacent to the overloaded one. With this known radiotelephone network, however, an assignment of the radiotelephone to another radio cell takes place when a call is sent out. If it is called, or if it is in standby mode, it is not possible to assign it to another radio cell.

Fra US-patent nr. 4 435 840 er det kjent en trafikkavhengig styring av størrelsen på radiocellen via sendeeffekten og dermed via radlorekkevldden. Radiosenderen må altså ha til rådighet en effektreserve slik at den ved et gitt tilfelle kan øke sin rekkevidde for at det med en mobil radiostasjon skal kunne nås en tilliggende radiocelle. From US patent no. 4 435 840, a traffic-dependent control of the size of the radio cell via the transmission power and thus via the radio frequency range is known. The radio transmitter must therefore have a power reserve at its disposal so that in a given case it can increase its range so that an adjacent radio cell can be reached with a mobile radio station.

Ved slike radionett kan det i områder med stor trafikk-tetthet i avhengighet av trafikkstrømmen og mobiliteten til de mobile radiotelefonene betinget av dagens tidspunkt, oppstå betydelige overbelastninger i de enkelte radiocellen, mens det innenfor andre radioceller i grenseområdene overhode aldri blir en fullstendig utnyttelse. With such radio networks, in areas with high traffic density, depending on the traffic flow and the mobility of the mobile radio telephones depending on the time of day, significant overloads can occur in the individual radio cells, while within other radio cells in the border areas there will never be full utilization at all.

Radiotelefonnettet ifølge oppfinnelsen av den art som angitt i karakteristikken til krav 1, har den fordelen at det finner sted en dynamisk cellestørrelsesstyring i avhengighet av antall mobile radiotelefoner til respektive radioceller, idet radioformidlingssentralen tilordner den mobile radiotelefonen som utgjør en overbelastning til en radiocelle til en andre fortrinnsvis tilliggende radiocelle. The radiotelephone network according to the invention of the type specified in the characteristic of claim 1 has the advantage that a dynamic cell size control takes place depending on the number of mobile radiotelephones to respective radiocells, the radio relay center assigning the mobile radiotelephone which constitutes an overload to one radiocell to another preferably adjacent radio cell.

Ved de i underkravene angitte trekk er fordelaktige videre-føringer og forbedringer av det i krav 1 angitte radiotelefonnettet mulig. Spesielt fordelaktig er et radiotelefonnett ifølge oppfinnelsen ved hvilket radioformidlingssentralen foretrekker å tilordne de mobile telefonene i grenseområdet ved en overbelastet radiocelle til tilliggende radiocelle. Derved tilveiebringes kun i cellegrenseområdet vekslende frekvensfordellng, noe som knapt fører til en ytterligere forstyrrelse. With the features specified in the subclaims, advantageous continuations and improvements of the radiotelephone network specified in claim 1 are possible. Particularly advantageous is a radio telephone network according to the invention in which the radio transmission center prefers to assign the mobile telephones in the border area of an overloaded radio cell to an adjacent radio cell. Thereby, alternating frequency distribution is only provided in the cell boundary area, which hardly leads to any further disturbance.

Oppfinnelsen skal nå beskrives nærmere med henvisning til tegningen, hvor: Den eneste figuren viser et utsnitt av et radloområde, som er oppdelt i radioceller FZ1, FZ2, .... The invention will now be described in more detail with reference to the drawing, where: The only figure shows a section of a radlo area, which is divided into radio cells FZ1, FZ2, ....

På figuren er radiocellene fremvist som sekskanter selv om det 1 praksis kam være anderledes formet og også være overlappende i avhengighet av områdets form. Hver radiocelle FZ1, FZ2, ... inneholder en stedfast radiostasjon Bl, B2, In the figure, the radio cells are shown as hexagons, although in practice they may be shaped differently and also overlap depending on the shape of the area. Each radio cell FZ1, FZ2, ... contains a fixed radio station Bl, B2,

.... De stedfaste radiostasjonen til et første delområde TG1 .... The fixed radio station of a first sub-area TG1

med et større antall radioceller er forbundet via ledninger LI, L2, ... med en radloformldllngssentral FV1. Ved et andre 1 radioceller oppdelt delområde TG2, er de stedfaste radiostasjonene forbundet via ledninger L10, LII, ... med en ytterligere radloformldllngssentral FV2, som står i forbindelse med radioformidlingssentralen FV1, jfr. lednlngs-forblndelsen LV. with a larger number of radio cells are connected via lines LI, L2, ... with a radio frequency control center FV1. In the case of a second sub-area TG2 divided into 1 radio cells, the fixed radio stations are connected via lines L10, LII, ... with a further radio transmission center FV2, which is in connection with the radio transmission center FV1, cf. the wiring combination LV.

Innenfor radiocellene opererer mobile radiotelefoner Ml, M2, ... , som normalt har radiokontakt med den stedfaste radiostasjonen til deres celle. Veksler en mobil radiotelefon, f.eks. Ml fra en radiocelle, f.eks. FZ1, til en tilliggende radiocelle, f.eks. FZ5, så får den radioformidlingssentralen FV1 en egnet stedfast radiostasjon, f.eks. B5, som tilviser radiocellen FZ5. Opptrer imidlertid det forholdet at det innenfor en radiocelle, f.eks. FZ1, oppholder flere mobile radiotelefoner Ml, M2, ... enn den stedfaste radiostasjonen, f.eks. Bl, kan betjene, så finner det sted en i det følgende beskrevne dynamisk cellestørrelsesstyring ved hjelp av radioformidlingssentralen. Radioformidlingssentralen FV1 kontrollerer nemlig løpende antall mobile radiotelefoner Ml, M2, ... i deres tilordnede radioceller FZ1, FZ2, ... til deres delområde TG1. Finner radioformidlingssentralen at en radiocelle, f.eks. FZ1 har overskredet det høyest tillatelige antall mobile radiotelefoner, så blir de antall radiotelefoner som overskrider dette tallet henvist til en annen radiocelle, f.eks. FZ6, eller flere andre radioceller, f.eks. FZ2 til FZ7. Within the radio cells, mobile radio telephones Ml, M2, ... operate, which normally have radio contact with the fixed radio station of their cell. Switches a mobile radio telephone, e.g. Ml from a radio cell, e.g. FZ1, to an adjacent radio cell, e.g. FZ5, then the radio broadcasting center FV1 gets a suitable fixed radio station, e.g. B5, which assigns the radio cell FZ5. However, if the situation occurs that within a radio cell, e.g. FZ1, maintains more mobile radio telephones Ml, M2, ... than the fixed radio station, e.g. Bl, can operate, then a dynamic cell size management described below takes place with the help of the radio broadcasting centre. The radio transmission center FV1 controls the ongoing number of mobile radio telephones Ml, M2, ... in their assigned radio cells FZ1, FZ2, ... to their sub-area TG1. If the radio communication center finds that a radio cell, e.g. The FZ1 has exceeded the highest permissible number of mobile radio telephones, then the number of radio telephones that exceed this number are referred to another radio cell, e.g. FZ6, or several other radio cells, e.g. FZ2 to FZ7.

Med fordel blir det av radioformidlingssentralen ved valg av tilordningen av den mobile radiotelefonen til en annen radiocelle tatt hensyn til bestemte kriterier. Radioformidlingssentralen, f. eks. FV1, skal som regel velge ut kun mobile radiotelefoner, som befinner seg 1 grenseområdene GB12 til GB17 i den overbelastede radiocellen, f.eks. FZ1, som f.eks. den mobile radiotelefonen M3 1 grenseområdet GB16. Denne mobile radiotelefonen blir da f.eks. tilvist radiocellen FZ6 hhv. den stedfaste radiostasjonen B6, jfr. den 1 grenseområdet GB16 begynnende pil. Et annet kriterium for valg av den mobile radiotelefonen tilvist en annen stedfast radiostasjon er det terrengmessige forholdet ved radiocellen. Ved radiocellen FZ4 er f.eks. antydet at i det øvre området befinner seg en større forhøyning E, som hindrer radiotrafik-ken. Da datamaskiner er tilordnet radioformidlingssentralen FV1, FV2, ... er de terrengmessige forholdene lagret for delområdet. Advantageously, when choosing the allocation of the mobile radio telephone to another radio cell, the radio transmission center takes certain criteria into account. The Radio Broadcasting Centre, e.g. FV1, as a rule, must select only mobile radio telephones, which are located in the border areas GB12 to GB17 in the congested radio cell, e.g. FZ1, such as the mobile radio telephone M3 1 border area GB16. This mobile radio telephone then becomes e.g. attributed to the radio cell FZ6 or the fixed radio station B6, cf. the 1 border area GB16 beginning arrow. Another criterion for choosing the mobile radio telephone assigned to another fixed radio station is the terrain conditions at the radio cell. At the radio cell FZ4, e.g. indicated that in the upper area there is a larger elevation E, which prevents radio traffic. As computers are assigned to the radio broadcasting center FV1, FV2, ... the terrain conditions are stored for the sub-area.

Når således f.eks. radioformidlingssentralen FV1 søker for den i grenseområdet GB14 seg befinnende mobile radiotelefon en annen stedfast radiostasjon, så blir det automatisk tatt hensyn til forhøyningen E, slik at den mobile radiotelefonen i greneområdet GB14 ikke blir tilordnet den i nærheten liggende stedfaste radiostasjonen B4, men f.eks. den stedfaste radiostasjonen B5, jfr. den fra grenseområdet GB14 utgående pil. When, for example, the radio transmission center FV1 searches for another fixed radio station for the mobile radio telephone located in the border area GB14, then the elevation E is automatically taken into account, so that the mobile radio telephone in the branch area GB14 is not assigned to the nearby fixed radio station B4, but e.g. . the fixed radio station B5, cf. the arrow emanating from the border area GB14.

Radioformidlingssentralen kan dessuten ved valg av en annen stedfast radiostasjon for den mobile radiotelefonen i et grenseområde også ta hensyn til, at en umiddelbart tilliggende radiocelle, f.eks. FZ2, også er overbelastet mens en ytterligere lengre borte liggende stedfast radiostasjon, f.eks. radiocellen FZ8 uten videre kan overta flere radiotelefoner. I dette tilfellet blir en del av de radiocellene FZ1 seg befinnende mobile radiotelefoner, som overskrider overbelastningstallet, tilvist tilliggende radiocelle FZ2, og som igjen viderefører de mobile radiotelefonene som overskrider antall mulige til dens tilliggende radiocelle FZ8, jfr. den fra grenseområdet GB12 utgående pil på tegningen. The radio broadcasting center can also take into account, when choosing another fixed radio station for the mobile radio telephone in a border area, that an immediately adjacent radio cell, e.g. FZ2, is also overloaded while a fixed radio station further away, e.g. the radio cell FZ8 can easily take over several radio telephones. In this case, part of the mobile radio telephones in the radio cells FZ1, which exceed the overload number, are assigned to the adjacent radio cell FZ2, which in turn forwards the mobile radio telephones that exceed the possible number to its adjacent radio cell FZ8, cf. the arrow emanating from the boundary area GB12 in the drawing.

Et ytterligere kriterium som tas hensyn til av radioformidlingssentralen for valget er overføringskvaliteten til radioforblndelsen mellom de stedfaste radiostasjonene Bl, B2, A further criterion that is taken into account by the radio broadcasting center for the election is the transmission quality of the radio link between the fixed radio stations Bl, B2,

... og den mobile radiotelefonen Ml, M2 .... Kvalitets-kriteriet er lagret i datamaskinen til radioformidlings- ... and the mobile radio telephone Ml, M2 .... The quality criterion is stored in the computer of the radio broadcasting

sentralen og blir løpende oppdatert. central and is continuously updated.

Claims

1. Radio telephone network for a radlo area divided into 1 radio cells with mobile radio telephones that operate 1 the entire radlo area, with a fixed radio station for each radio cell and with a radlo formation center common to the fixed radio stations, characterized by the fact that the radio dissemination center (FV1) continuously controls the number of mobile radio phones (Ml, M2) which resides in 1 radio cells (FZ1, FZ2) and when registering an excess of the number of mobile radio telephones that is permissible for a radio cell, assigns those who exceed this number to one or more other radio cells.

2. Radio telephone network according to claim 1, characterized in that the assignment of mobile radio telephones (Ml, M2) to adjacent radio cells (FZ1, FZ2) takes place in accordance with geographical and topographical conditions for the relevant sub-area (TG1, TG2).

3. Radio telephone network according to claim 1, characterized in that the radio transmission center (FV1) preferably assigns the mobile radio telephones (M2) in the border area (GB12, GB13) to an overloaded radio cell (FZ1) to an adjacent and preferably the nearest radio cell.

4. Radio telephone network according to claim 1, 2 or 3, characterized in that the radio transmission center (FV1) takes into account the currently existing number of mobile radio telephones (Ml, M2) in the radio cell (FZ2, FZ3) adjacent to an overloaded radio cell (FZ1).

5. Radio telephone network according to one of claims 1 to 4, characterized in that the radio transmission center (FV1) continuously controls the transmission quality of the radio connection between the mobile radio telephones (M1, M2) and the fixed radio stations (B1, B2) and takes this into account in the dynamic cell size control - the ring.

6. Radiotelephone network according to claim 3, characterized in that the total boundary area of a radio cell (FZ1) is divided into several boundary areas (GB12, GB13), which are processed separately by the radio transmission center (FV1).