SE515861C2 - Control channel transmission in mobile telecommunication system, has the channel divided into wide lobe location signal and narrow lobe control signal - Google Patents
Control channel transmission in mobile telecommunication system, has the channel divided into wide lobe location signal and narrow lobe control signalInfo
- Publication number
- SE515861C2 SE515861C2 SE9804092A SE9804092A SE515861C2 SE 515861 C2 SE515861 C2 SE 515861C2 SE 9804092 A SE9804092 A SE 9804092A SE 9804092 A SE9804092 A SE 9804092A SE 515861 C2 SE515861 C2 SE 515861C2
- Authority
- SE
- Sweden
- Prior art keywords
- signal
- control
- lobe
- control channel
- wide
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/28—Cell structures using beam steering
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
515 861 2 används för att stödja signalstyrkemätningama som behövs. Pejlsignalen kräver också endast mycket låg effekt. Den bredlobiga signalen kan vara helt omodulerad eller innehålla en platsidentifikation som sänds med en mycket låg bithastighet. Det är också mycket mindre krav på styrsignalen, eftersom den inte används för signal- styrkemätningar. Således kan signalstyrkan hos styrsignalen anpassas efter behov och det gör inget om den innehåller tomma luckor. 515 861 2 is used to support the signal strength measurements needed. The sounding signal also requires only very low power. The broad-spectrum signal may be completely unmodulated or contain a site identification transmitted at a very low bit rate. There is also much less requirement for the control signal, as it is not used for signal strength measurements. Thus, the signal strength of the control signal can be adjusted as needed and it does not matter if it contains empty slots.
Sammanfattning av uppfinningen Således tillhandahåller föreliggande uppfinning en metod att sända en styr- kanal i ett mobiltelekommunikationssystem i vilket huvudkommunikationen mellan basstationer och mobilstationer utföres i smala lober.Summary of the Invention Thus, the present invention provides a method of transmitting a control channel in a mobile telecommunication system in which the main communication between base stations and mobile stations is performed in narrow lobes.
Enligt uppfinningen är styrkanalen uppdelad i en bredlobi g pejlsignal för signalstyrkemätningar av mobilstationema och en smallobig styrsignal för att översända styrinformation till mobilstationerna.According to the invention, the control channel is divided into a broad-spectrum sound signal for signal strength measurements of the mobile stations and a small-mobile control signal for transmitting control information to the mobile stations.
Uppfinningen är definierad i bifogade krav l, medan föredragna utförings- former är angivna i de underordnade kraven.The invention is defined in appended claims 1, while preferred embodiments are set out in the dependent claims.
Kortfattad beskrivning av ritningarna Uppfinningen kommer att beskrivas i detalj nedan med hänvisning till den åtföljande ritningen, varav den enda figuren är en schematisk vy över de olika komponenterna i en styrkanal i enlighet med föreliggande uppfinning mellan en basstation och en mobilstation.Brief Description of the Drawings The invention will be described in detail below with reference to the accompanying drawing, of which the single figure is a schematic view of the various components of a control channel in accordance with the present invention between a base station and a mobile station.
Detaljerad beskrivning av föredragna utföringsformer Mobiltelekommunikationssystem som använder smala lober införes för att öka kapaciteten tack vare större frekvensåteranvändning och minskad interferens, vilka är förknippade med smala lober. Föreliggande uppfinning behandlar specifikt problemet att upprätta en styrkanal mellan en basstation och mobilstationer.Detailed Description of Preferred Embodiments Mobile telecommunication systems using narrow lobes are introduced to increase capacity due to greater frequency reuse and reduced interference associated with narrow lobes. The present invention specifically addresses the problem of establishing a control channel between a base station and mobile stations.
Funktionerna hos styrkanalen är å ena sidan att sända styrinformation och, å andra sidan, att tillhandahålla en källa för si gnalstyrkemätningar som används vid hand- over mellan olika basstationer eller basplatser.The functions of the control channel are, on the one hand, to transmit control information and, on the other hand, to provide a source of signal strength measurements used in handover between different base stations or base locations.
I figur l visas en basstation BS som kommunicerar med en mobilstation MS 1. Huvudkommunikationen utförs i en smal lob 1. En annan mobilstation MS2 kommunicerar med en annan basplats (ej visad). Då mobilstationen MS2 närmar sig basstationen BS kan det vara fördelaktigt att flytta kommunikationen till denna basstationen, dvs utföra en handover. För att bedöma kandidatbasstationen BS måste mobilstationen MS2 utföra någon form av si gnalstyrkemätning såsom är välkänt inom området. I ett bredlobigt system skulle en styrkanal sändas i en bred lob och vara tillgänglig för mobilstationen MS2 för mätningar. I ett smallobigt system skulle 40 515 861 3 emellertid en bredlobig styrkanal uppta för mycket kanalutrynime och kräva en onödigt stor effekt. Ä andra sidan, om styrkanalen sänds i en smal lob, såsom loben l som pekar mot mobilstationen MSI, skulle den inte vara tillgänglig för mobil- stationen MS2. Naturligtvis finns det många mobilstationer (ej visade) varav en eventuellt skulle peka i riktning mot mobilstationen MSZ, eller skulle en smallobig styrsignal kunna vara anordnad att bestråla alla lober kring platsen i ett förutbestämt mönster, men detta skulle t.ex. leda till långa fördröjningar mellan mätmöj ligheter, som nämns ovan.Figure 1 shows a base station BS communicating with a mobile station MS 1. The main communication is performed in a narrow lobe 1. Another mobile station MS2 communicates with another base location (not shown). When the mobile station MS2 approaches the base station BS, it may be advantageous to move the communication to this base station, ie to perform a handover. To assess the candidate base station BS, the mobile station MS2 must perform some form of signal strength measurement as is well known in the art. In a wide-lobe system, a control channel would be transmitted in a wide lobe and be available to the mobile station MS2 for measurements. In a small-lobed system, however, a wide-lobed control channel would take up too much channel utrynime and require an unnecessarily large power. On the other hand, if the control channel is transmitted in a narrow beam, such as the beam 1 pointing towards the mobile station MSI, it would not be available to the mobile station MS2. Of course, there are many mobile stations (not shown), one of which could possibly point in the direction of the mobile station MSZ, or a small-loop control signal could be arranged to irradiate all lobes around the site in a predetermined pattern, lead to long delays between measurement possibilities, as mentioned above.
Föreliggande uppfinnare har insett att de två funktionerna hos styrkanalen kan separeras. Således sänds en pejlsignal i en bred lob, företrädesvis 360°, från en basstation och är alltid tillgänglig för signalstyrkemätningar. I figur l är pejlsignalen 2 representerad av en cirkel med streckad linje. Naturligtvis väljs effekten så att pejlsignalen når mobilstationer, såsom MSZ, för vilka handover är möjlig. Infonna- tionsdelen av styrkanalen sänds som en styrsignal i en smal lob 1 till respektive mobilstation.The present inventors have realized that the two functions of the control channel can be separated. Thus, a beacon signal is transmitted in a wide lobe, preferably 360 °, from a base station and is always available for signal strength measurements. In Figure 1, the bearing signal 2 is represented by a circle with a dashed line. Of course, the power is selected so that the beacon signal reaches mobile stations, such as MSZ, for which handover is possible. The information part of the control channel is transmitted as a control signal in a narrow lobe 1 to the respective mobile station.
I en utföringsform av uppfinningen är pejlsignalen en enkel omodulerad radiosignal, t ex en signal med en ton, med en förutbestämd utsänd effekt.In an embodiment of the invention, the sound signal is a simple unmodulated radio signal, for example a signal with one tone, with a predetermined transmitted power.
Lämpli gen har varje basstation en pejlsignal med en unik frekvens, vilken är känd för mobilstationema, så att mobilstationerna kan särskilja mellan olika basstationer.Suitably, each base station has a beacon signal with a unique frequency, which is known to the mobile stations, so that the mobile stations can distinguish between different base stations.
I en föredragen utföringsform innehåller pejlsignalen också information om identiteten hos basstationen som sänder pejlsignalen. I det här fallet moduleras pejlsignalen med en identitetssignal och bärfrekvensen hos pejlsignalen behöver inte vara unik för alla basstationer. Identitetsinformationen kan t ex kräva endast 16 bit per sekund, vilket upptar en mycket liten del av det tillgängliga frekvensspektret.In a preferred embodiment, the beacon signal also contains information about the identity of the base station transmitting the beacon signal. In this case, the beacon signal is modulated with an identity signal and the carrier frequency of the beacon signal need not be unique to all base stations. The identity information may, for example, require only 16 bits per second, which occupies a very small part of the available frequency spectrum.
Detta kan jämföras med den traditionella styrkanalen som kräver 16 kbit per sekund.This can be compared to the traditional control channel which requires 16 kbit per second.
I en altemativ utföringsform innehåller pejlsignalen också några delar av styrinforrnationen. Detta tillåtes så länge som pejlsignalen inte upptar för mycket bandbredd.In an alternative embodiment, the bearing signal also contains some parts of the control information. This is allowed as long as the beacon signal does not take up too much bandwidth.
Signaleringen av åtminstone huvuddelarna av styrinformationen utföres i en smal lob med en lämplig bithastighet. Eftersom signalen sänds i en smal lob används emellertid frekvensspektret på ett effektivt sätt, eftersom frekvensen kan återanvändas i andra smala lober. Dessutom, såsom nämns ovan, finns det inga krav på styrsignaleringen med avseende på signalstyrka och således kan signalstyrkan hos styrsignalen minskas när en mobilstation befinner sig nära basstationen och styrsignalen kan till och med vara helt tyst, om ingen styrinforrnation måste sändas vid en specifik tidpunkt.The signaling of at least the main parts of the control information is performed in a narrow lobe with a suitable bit rate. However, since the signal is transmitted in a narrow beam, the frequency spectrum is used efficiently, since the frequency can be reused in other narrow beams. In addition, as mentioned above, there are no requirements for the control signaling with respect to signal strength and thus the signal strength of the control signal can be reduced when a mobile station is near the base station and the control signal can even be completely silent if no control information has to be transmitted at a specific time.
En fackman på området inser att uppfinningen kan implementeras på olika sätt med användning av olika kombinationer av hårdvara och mjukvara. Alla sådana kombinationer är avsedda att falla inom ramen för uppfinningen som den är definierad av nedanstående patentkrav.One skilled in the art will appreciate that the invention may be practiced in various ways using various combinations of hardware and software. All such combinations are intended to fall within the scope of the invention as defined by the following claims.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9804092A SE515861C2 (en) | 1998-11-27 | 1998-11-27 | Control channel transmission in mobile telecommunication system, has the channel divided into wide lobe location signal and narrow lobe control signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9804092A SE515861C2 (en) | 1998-11-27 | 1998-11-27 | Control channel transmission in mobile telecommunication system, has the channel divided into wide lobe location signal and narrow lobe control signal |
Publications (3)
Publication Number | Publication Date |
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SE9804092D0 SE9804092D0 (en) | 1998-11-27 |
SE9804092L SE9804092L (en) | 2000-05-28 |
SE515861C2 true SE515861C2 (en) | 2001-10-22 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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SE9804092A SE515861C2 (en) | 1998-11-27 | 1998-11-27 | Control channel transmission in mobile telecommunication system, has the channel divided into wide lobe location signal and narrow lobe control signal |
Country Status (1)
Country | Link |
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SE (1) | SE515861C2 (en) |
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1998
- 1998-11-27 SE SE9804092A patent/SE515861C2/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
SE9804092L (en) | 2000-05-28 |
SE9804092D0 (en) | 1998-11-27 |
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