WO2000054535A1 - Method for allocating transmission channels in a radio communications system - Google Patents

Method for allocating transmission channels in a radio communications system Download PDF

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Publication number
WO2000054535A1
WO2000054535A1 PCT/DE2000/000743 DE0000743W WO0054535A1 WO 2000054535 A1 WO2000054535 A1 WO 2000054535A1 DE 0000743 W DE0000743 W DE 0000743W WO 0054535 A1 WO0054535 A1 WO 0054535A1
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Prior art keywords
base station
radio
radio station
characteristic value
station
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PCT/DE2000/000743
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German (de)
French (fr)
Inventor
Markus Dillinger
Enric Mitjana
Gerald Ostermayer
Egon Schulz
Peter Slanina
Bernhard Wegmann
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Siemens Aktiengesellschaft
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Publication of WO2000054535A1 publication Critical patent/WO2000054535A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2618—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using hybrid code-time division multiple access [CDMA-TDMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management

Definitions

  • the invention relates to a method for assigning transmission channels in a radio communication system, in particular in a mobile radio system.
  • radio communication systems information such as voice, picture information or other data is transmitted with the aid of electromagnetic waves via a radio interface between a transmitting and a receiving radio station, such as a base station or radio station.
  • the electromagnetic waves are emitted at carrier frequencies that lie in the frequency band intended for the eternal system.
  • GSM Global System for Mobile Communication
  • the carrier frequencies are in the range of 900 MHz, 1800 MHz and 1900 MHz.
  • UMTS Universal Mobile Telecommunication System
  • 3rd generation systems frequencies in the frequency band of approx. 2000 MHz are provided.
  • a transmission channel is assigned to a mobile station m in such a way that the mobile station from the base station, in the radio coverage area of which the mobile station is located, when a connection is established, a specific unoccupied time slot with a specific carrier frequency supported by the base station is assigned which corresponds to a transmission channel.
  • Basis for the assignment of transmission channels m the GSM mobile radio system is a frequency planning that the
  • the use of a CDMA subscriber separation method enables the same carrier frequency to be used in adjacent radio cells. Due to the possibility of transmitting a large number of different services, such as real-time (RT - Real Time), e.g. voice transmission, and non-real-time services (NRT - Non Real Time), e.g. data packet transmission, with different transmission rates with up to 2 Mbit / s
  • RT - Real Time real-time
  • NRT - Non Real Time non-real-time services
  • the effective radio cell size of a base station varies, with higher-rate services having a shorter range than low-rate services. This results in a service-dependent variation in the radio cell size.
  • the invention is based on the object of specifying a method which enables flexible assignment of transmission channels. This object is achieved by the arrangement according to the features of the independent claim. Further developments of the invention can be found in the subclaims.
  • Radio communication system based on frequency planning as is necessary in the current GSM mobile radio system according to the prior art mentioned.
  • the dynamic allocation process adapts adaptively to the traffic conditions, which in turn generate certain interference scenarios. Exemplary embodiments of the invention are explained in more detail with reference to the accompanying drawings.
  • FIG. 1 shows a block diagram of a radio communication system, in particular a mobile radio system
  • FIG. 2 shows a schematic representation of the frame structure of the radio interface and the structure of a radio block
  • FIG. 3 shows a flowchart of the method according to the invention when a connection is established and an existing connection is established.
  • the structure of the radio communication system shown in FIG. 1 and exemplarily designed as a mobile radio system corresponds to the known GSM mobile radio system, which consists of a large number of mobile switching centers MSC which are networked with one another or which provide access to a fixed network PSTN. Furthermore, these mobile switching centers MSC are each connected to at least one device for the allocation of radio resources RNM. Each of these devices RNM in turn enables a connection to at least one base station BS. This base station BS is one
  • Radio station which can establish and trigger communication connections to other radio stations, which can be configured as mobile stations MS or stationary subscriber terminals, via a radio interface.
  • the functionality of this structure is used by the method according to the invention.
  • 1 shows an example of a radio connection for the transmission of, for example, user data and signaling information between the base station BS and a mobile station MS shown, which is the radio coverage area of the base station BS.
  • FIG. 2 An exemplary frame structure of the radio interface can be seen in FIG. 2.
  • Each time slot ts within the frequency band B forms a frequency channel fk.
  • the successive time slots ts are structured according to a frame structure. In this way, 16 time slots ts0 to tsl5 are combined to form a time frame tf.
  • E frequency channel fk for the upward direction corresponds in this case to the frequency channel fk for the downward direction.
  • the other frequency channels fk are structured in the same way.
  • Radio blocks are transmitted within the frequency channels fk. These radio blocks consist of sections with data d, in each of which sections with embedded training sequences tseql to tseqn are known.
  • the data d are spread with a fine structure, a spreading code c (CDMA code), so that, for example, n connections can be separated on the receiving side by this CDMA component s ⁇ .
  • CDMA code spreading code
  • the combination of a frequency channel fk and a spread code c defines a physical transmission channel TCH, the functions for the transmission of signaling and Nutzinforma ⁇ can be used. This transmission channel formations for transferring Nutzin ⁇ referred to as traffic channel (Traffic Channel).
  • the spreading of individual symbols of the data d with Q chips has the effect that Q subsections of the duration tchip are transmitted within the symbol duration tsym.
  • the Q chips form the individual CDMA code c.
  • a protection time gp is provided within the time slot ts to compensate for different signal delays of the connections of successive time slots ts.
  • connection establishment is stimulated by the radio station MS as an example.
  • the radio station MS determines the strongest base station BS in the state of a connection that does not exist, the so-called idle mode. From this observation of the surrounding base stations BS, the radio station MS determines the base station BS whose general signaling channel (BCCH - Broadcast Control Channel) it receives with the greatest reception strength and signals this base station BS via an access signaling channel R ⁇ CH (Random Access Channel) a connection request.
  • BCCH - Broadcast Control Channel whose general signaling channel (BCCH - Broadcast Control Channel) it receives with the greatest reception strength and signals this base station BS via an access signaling channel R ⁇ CH (Random Access Channel) a connection request.
  • R ⁇ CH Random Access Channel
  • the base station BS evaluates the access signaling channel R ⁇ CH and signals the radio station MS one or more time slots ts, in which the radio station MS is to subsequently determine a respective characteristic value.
  • This pre-selection of the time slots ts is possible through em a-pnon knowledge of the assignment of transmission channels in the e-wave time slots ts. For example Time slots ts in which no free transmission channel TCH is available are disregarded, whereas time slots ts with still free transmission channels TCH come into question for assigning the desired number of transmission channels TCH to the radio station MS.
  • connection request is confirmed by the base station BS via an access grant confirmation signal and the selected time slots ts are signaled to the radio station MS.
  • the radio station MS determines a respective characteristic value in the signaled time slots ts and signals this to a signaling message measurement report to the base station BS.
  • the base station BS evaluates the signaled measurement report and, on the basis of the respective characteristic values and, if applicable, its own determined characteristic values, selects one or more time slots ts or. Transmission channels TCH, which it then signals to the radio station MS.
  • the ascertained characteristic values can also be averaged over the time interval tr.
  • the base station BS can subsequently signal the radio station MS (not shown) in which time slots ts the periodic determination of the characteristic see values should be done. This enables a quick intra-cell handover to be carried out.
  • the concrete specification of the time slots ts advantageously saves computing power m of the radio station MS, in particular m in idle mode, and on the other hand only the base stations BS causing interference with the respective time slots ts are taken into account in the channel assignment procedure.
  • the method according to the invention can be carried out when a connection is established on the network side, the base station BS, for example, already signaling the time slots ts when the connection is being established, with which the called radio station MS is to determine a respective characteristic value.
  • the signaling known from the GSM mobile radio system can be expanded, for example.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

In a radio communications system using a TD/CDMA subscriber separation method, a base station signals at least one defined time slot when a communication link is established from/to a radio station. In said time slot at least one characteristic value concerning the transmission conditions of the radio interface between the base station and the radio station is to be determined. The radio station then signals the characteristic value determined to the base station, which takes said characteristic value into consideration in the allocation of at least one transmission channel.

Description

Beschreibungdescription
Verfahren zur Zuweisung von Ubertragungskanalen m einem Funk-KommunikationssysteMethod for assigning transmission channels in a radio communication system
Die Erfindung betrifft ein Verfahren zur Zuweisung von Ubertragungskanalen m einem Funk-Kommunikationssystem, insbesondere m einem Mobilfunksystem.The invention relates to a method for assigning transmission channels in a radio communication system, in particular in a mobile radio system.
In Funk-Kommunikationssystemen werden Informationen wie beispielsweise Sprache, Bildmformationen oder andere Daten, mit Hilfe von elektromagnetischen Wellen über eine Funkschnittstelle zwischen einer sendenden und einer empfangenden Funkstation, wie beispielsweise einer Basisstation bzw. Funksta- tion, übertragen. Das Abstrahlen der elektromagnetischen Wellen erfolgt dabei mit Tragerfrequenzen, die m dem für das eweilige System vorgesehenen Frequenzband liegen. Beim GSM (Global System for Mobile Com unication) , das unter anderem aus J. Biala „Mobilfunk und Intelligente Netze", Vieweg Ver- lag, 1995, bekannt ist, liegen die Tragerfrequenzen im Bereich von 900 MHz, 1800 MHz und 1900 MHz. Für zukunftige Mo- bilfunksysteme mit CDMA- oder TD/CDMA- Ubertragungsverfahren über die Funkschnittstelle, wie beispielsweise das UMTS (Universal Mobile Telecom unication System) oder andere Systeme der 3. Generation sind Frequenzen im Frequenzband von ca. 2000 MHz vorgesehen.In radio communication systems, information such as voice, picture information or other data is transmitted with the aid of electromagnetic waves via a radio interface between a transmitting and a receiving radio station, such as a base station or radio station. The electromagnetic waves are emitted at carrier frequencies that lie in the frequency band intended for the eternal system. With GSM (Global System for Mobile Communication), which is known from J. Biala "Mobile Communications and Intelligent Networks", Vieweg Verlag, 1995, among others, the carrier frequencies are in the range of 900 MHz, 1800 MHz and 1900 MHz. For future mobile radio systems with CDMA or TD / CDMA transmission methods via the radio interface, such as the UMTS (Universal Mobile Telecommunication System) or other 3rd generation systems, frequencies in the frequency band of approx. 2000 MHz are provided.
In dem bekannten GSM-Mobilfunksystem erfolgt eine Zuweisung eines Übertragungskanal zu einer Mobilstation m der Weise, daß der Mobilstation von der Basisstation, in dessen Funkversorgungsbereich sich die Mobilstation befindet, bei einem Verbindungsaufbau ein bestimmter nicht belegter Zeitschlitz m einer bestimmte von der Basisstation unterst tzten Tragerfrequenz zugewiesen wird, der einem Ubertragungskanal ent- spricht. Grundlage für die Zuweisung von Ubertragungskanalen m dem GSM-Mobilfunksystem ist eine Frequenzplanung, die dieIn the known GSM mobile radio system, a transmission channel is assigned to a mobile station m in such a way that the mobile station from the base station, in the radio coverage area of which the mobile station is located, when a connection is established, a specific unoccupied time slot with a specific carrier frequency supported by the base station is assigned which corresponds to a transmission channel. Basis for the assignment of transmission channels m the GSM mobile radio system is a frequency planning that the
Ausmaße einer jeweiligen Funkzelle einer Basisstation fest¬ legt. Diese Frequenzplanung ist aufgrund von Interferenzbe¬ einflussung benachbarter Funkzellen m den Randzonen der Funkzellen notwendig.Dimensions of a respective radio cell of a base station determines ¬ sets. This frequency planning is due to Interferenzbe ¬ influencing neighboring radio cells m the edge zones of the radio cells necessary.
In den Funk-Kommunikationssystemen der 3. Generation wird durch den Einsatz eines CDMA-Teilnehmersepaπerungsverfahrens (Code Division Multiple Access) eine Verwendung der gleichen Tragerfrequenz m benachbarten Funkzellen ermöglicht. Durch die Möglichkeit der Übertragung einer Vielzahl von unterschiedlichen Diensten, wie Echtzeit- (RT - Real Time), bspw. Sprachubertragung, und Nicht-Echtzeitdiensten (NRT - Non Real Time) , bspw. Datenpaketubertragung, mit unterschiedlichen Ubertragungsraten mit bis zu 2 Mbit/s variiert die effektive Funkzellengroße einer Basisstation, wobei hoherratige Dienste eine geringere Reichweite als niederratige Dienste aufweisen. Hierdurch kommt es zu einer diensteabhangigen Variation der Funkzellengroße .In the 3rd generation radio communication systems, the use of a CDMA subscriber separation method (Code Division Multiple Access) enables the same carrier frequency to be used in adjacent radio cells. Due to the possibility of transmitting a large number of different services, such as real-time (RT - Real Time), e.g. voice transmission, and non-real-time services (NRT - Non Real Time), e.g. data packet transmission, with different transmission rates with up to 2 Mbit / s The effective radio cell size of a base station varies, with higher-rate services having a shorter range than low-rate services. This results in a service-dependent variation in the radio cell size.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren anzugeben, das eine flexible Zuweisung von Ubertragungskanalen ermöglicht. Diese Aufgabe wird durch die Anordnung gemäß den Merkmalen des unabhängigen Patentanspruchs gelost. Weiter- bildungen der Erfindung sind den Unteranspruchen zu entnehmen.The invention is based on the object of specifying a method which enables flexible assignment of transmission channels. This object is achieved by the arrangement according to the features of the independent claim. Further developments of the invention can be found in the subclaims.
Die erfmdungsgemaße Signalisierung für die Durchfuhrung einer dynamischen Zuweisung zumindest eines Ubertragungskanals ermöglicht vorteilhaft eine Entbindung des Betreibers desThe signaling according to the invention for carrying out a dynamic assignment of at least one transmission channel advantageously enables the operator of the
Funk-Kommunikationssystems von einer Frequenzplanung, wie sie m dem aktuellen GSM-Mobilfunksystem nach dem genannten Stand der Technik notwendig ist. Das dynamische Zuweisungsverfahren paßt sich adaptiv an die Verkehrsbegebenheiten, welche wie- derum gewisse Interferenzszenarien erzeugen, an. Ausfuhrungsbeispiele der Erfindung werden anhand der beiliegenden Zeichnungen naher erläutert.Radio communication system based on frequency planning, as is necessary in the current GSM mobile radio system according to the prior art mentioned. The dynamic allocation process adapts adaptively to the traffic conditions, which in turn generate certain interference scenarios. Exemplary embodiments of the invention are explained in more detail with reference to the accompanying drawings.
Dabei zeigenShow
FIG 1 ein Blockschaltbild eines Funk-Kommunikationssystems, insbesondere eines Mobilfunksystems, FIG 2 eine schematische Darstellung der Rahmenstruktur der Funkschnittstelle und des Aufbaus eines Funkblocks, und FIG 3 ein Ablaufdiagramm des erfmdungsgemaßen Verfahrens bei einem Verbindungsaufbau und bei einer bestehenden Verbindung .1 shows a block diagram of a radio communication system, in particular a mobile radio system, FIG. 2 shows a schematic representation of the frame structure of the radio interface and the structure of a radio block, and FIG. 3 shows a flowchart of the method according to the invention when a connection is established and an existing connection is established.
Das in FIG.1 dargestellte und beispielhaft als ein Mobilfunksystem ausgestaltete Funk-Kommunikationssystem entspricht m seiner Struktur dem bekannten GSM-Mobilfunksystem, das aus einer Vielzahl von Mobilvermittlungsstellen MSC besteht, die untereinander vernetzt sind bzw. den Zugang zu einem Festnetz PSTN herstellen. Weiterhin sind diese Mobilvermittlungsstel- len MSC mit jeweils zumindest einer Einrichtung zur Zuweisung funktechnischer Ressourcen RNM verbunden. Jede dieser Einrichtungen RNM ermöglicht wiederum eine Verbindung zu zumin- dest einer Basisstation BS . Diese Basisstation BS ist eineThe structure of the radio communication system shown in FIG. 1 and exemplarily designed as a mobile radio system corresponds to the known GSM mobile radio system, which consists of a large number of mobile switching centers MSC which are networked with one another or which provide access to a fixed network PSTN. Furthermore, these mobile switching centers MSC are each connected to at least one device for the allocation of radio resources RNM. Each of these devices RNM in turn enables a connection to at least one base station BS. This base station BS is one
Funkstation, die über eine Funkschnittstelle Kommunikationsverbindungen zu weiteren Funkstationen, die als Mobilstatio- nen MS oder stationäre Teilnehmerendgerate ausgestaltet sein können, aufbauen und auslosen kann. Die Funktionalität dieser Struktur wird von dem erfmdungsgemaßen Verfahren genutzt.Radio station, which can establish and trigger communication connections to other radio stations, which can be configured as mobile stations MS or stationary subscriber terminals, via a radio interface. The functionality of this structure is used by the method according to the invention.
In FIG 1 ist beispielhaft eine Funkverbindungen zur Übertragung von beispielsweise Nutzdaten und Signalisierungsmforma- tionen zwischen der Basisstation BS und einer Mobilstation MS dargestellt, die sich dem Funkversorgungsgebiet der Basis- station BS befindet.1 shows an example of a radio connection for the transmission of, for example, user data and signaling information between the base station BS and a mobile station MS shown, which is the radio coverage area of the base station BS.
Eine beispielhafte Rahmenstruktur der Funkschnittstelle ist aus der FIG 2 ersichtlich. Gemäß einer TDMA-Komponente ist eine Aufteilung eines breitbandigen Frequenzbandes, beispielsweise der Bandbreite B = 5 MHz, m mehrere Zeitschlitze ts, beispielsweise 16 Zeitschlitze tsO bis tsl5 vorgesehen. Jeder Zeitschlitz ts innerhalb des Frequenzbandes B bildet einen Frequenzkanal fk. Innerhalb eines breitbandigen Frequenzbandes B werden die aufeinanderfolgenden Zeitschlitze ts nach einer Rahmenstruktur gegliedert. So werden 16 Zeitschlitze tsO bis tsl5 zu einem Zeitrahmen tf zusammengefaßt.An exemplary frame structure of the radio interface can be seen in FIG. 2. According to a TDMA component, a division of a broadband frequency band, for example the bandwidth B = 5 MHz, into several time slots ts, for example 16 time slots ts0 to tsl5, is provided. Each time slot ts within the frequency band B forms a frequency channel fk. Within a broadband frequency band B, the successive time slots ts are structured according to a frame structure. In this way, 16 time slots ts0 to tsl5 are combined to form a time frame tf.
Bei einer Nutzung eines TDD-Ubertragungsverfahrens wird em Teil der Zeitschlitze tsO bis tsl5 m Aufwartsrichtung und em Teil der Zeitschlitze tsO bis tsl5 m Abwartsrichtung benutzt, wobei die Übertragung m Aufwartsrichtung beispielsweise vor der Übertragung m Abwartsrichtung erfolgt. Dazwi- sehen liegt em Umschaltzeitpunkt SP, der entsprechend dem jeweiligen Bedarf an Ubertragungskanalen für die Auf- und Abwartsrichtung flexibel positioniert werden kann. E Frequenzkanal fk für die Aufwartsrichtung entspricht m diesem Fall dem Frequenzkanal fk für die Abwartsrichtung. In glei- eher Weise sind die weiteren Frequenzkanale fk strukturiert.When a TDD transmission method is used, part of the time slots tsO to tsl5 in the upward direction and part of the time slots tsO to tsl5 in the downward direction are used, the transmission in the upward direction taking place, for example, before the transmission in the downward direction. In between there is a changeover point SP, which can be flexibly positioned for the up and down direction according to the respective need for transmission channels. E frequency channel fk for the upward direction corresponds in this case to the frequency channel fk for the downward direction. The other frequency channels fk are structured in the same way.
Innerhalb der Frequenzkanale fk werden Informationen mehrerer Verbindungen m Funkblocken übertragen. Diese Funkblocke bestehen aus Abschnitten mit Daten d, m denen jeweils Ab- schnitte mit empfangsseitig bekannten Trainingssequenzen tseql bis tseqn eingebettet sind. Die Daten d sind verbm- dungsmdividuell mit einer Feinstruktur, einem Spreizkode c (CDMA-Kode) , gespreizt, so daß empfangsseitig beispielsweise n Verbindungen durch diese CDMA-Komponente sepaπerbar s α. Die Kombination aus einem Frequenzkanal fk und einem Spreiz- kode c definiert einen physikalischen Ubertragungskanal TCH, der für die Übertragung von Signalisierungs- und Nutzinforma¬ tionen genutzt werden kann. Für die Übertragung von Nutzin¬ formationen wird dieser Übertragungskanal auch als Verkehrs- kanal (Traffic Channel) bezeichnet.Information of several connections m radio blocks are transmitted within the frequency channels fk. These radio blocks consist of sections with data d, in each of which sections with embedded training sequences tseql to tseqn are known. The data d are spread with a fine structure, a spreading code c (CDMA code), so that, for example, n connections can be separated on the receiving side by this CDMA component s α. The combination of a frequency channel fk and a spread code c defines a physical transmission channel TCH, the functions for the transmission of signaling and Nutzinforma ¬ can be used. This transmission channel formations for transferring Nutzin ¬ referred to as traffic channel (Traffic Channel).
Die Spreizung von einzelnen Symbolen der Daten d mit Q Chips bewirkt, daß innerhalb der Symboldauer tsym Q Subabschnitte der Dauer tchip übertragen werden. Die Q Chips bilden dabei den individuellen CDMA-Kode c. Weiterhin ist innerhalb des Zeitschlitzes ts eine Schutzzeit gp zur Kompensation unterschiedlicher Signalaufzeiten der Verbindungen aufeinanderfolgender Zeitschlitze ts vorgesehen.The spreading of individual symbols of the data d with Q chips has the effect that Q subsections of the duration tchip are transmitted within the symbol duration tsym. The Q chips form the individual CDMA code c. Furthermore, a protection time gp is provided within the time slot ts to compensate for different signal delays of the connections of successive time slots ts.
In der FIG 3 ist e Ablaufdiagramm des erfmdungsgemaßen3 shows a flowchart of the method according to the invention
Verfahrens angegeben, bei dem beispielhaft em Verbindungsaufbau von der Funkstation MS angeregt wird.Method specified in which the connection establishment is stimulated by the radio station MS as an example.
Die Funkstation MS ermittelt m dem Zustand einer nicht be- stehenden Verbindung, dem sogenannten Idle-Mode die stärkste Basisstation BS . Aus dieser Beobachtung der umgebenden Basis- stationen BS ermittelt die Funkstation MS die Basisstation BS, deren allgemeinen Signalisierungskanal (BCCH - Broadcast Control Channel) sie mit der größten Empfangsstarke empfangt, und signalisiert dieser Basisstation BS über einen Zugangs- signalisierungskanal RÄCH (Random Access Channel) eine Verbindungsanforderung .The radio station MS determines the strongest base station BS in the state of a connection that does not exist, the so-called idle mode. From this observation of the surrounding base stations BS, the radio station MS determines the base station BS whose general signaling channel (BCCH - Broadcast Control Channel) it receives with the greatest reception strength and signals this base station BS via an access signaling channel RÄCH (Random Access Channel) a connection request.
Die Basisstation BS wertet den Zugangssignalisierungkanal RÄCH aus und signalisiert der Funkstation MS einen oder mehrere Zeitschlitze ts, m denen die Funkstation MS nachfolgend einen jeweiligen charakteristischen Wert ermitteln soll. Diese Vorauswahl der Zeitschlitze ts ist durch em a-pnon- Wissen über die Belegung von Ubertragungskanalen m den e- welligen Zeitschlitzen ts möglich. So können beispielsweise Zeitschlitze ts, in denen kein freier Ubertragungskanal TCH mehr zur Verfugung steht, außer Acht gelassen werden, wohingegen Zeitschlitze ts mit noch freien Ubertragungskanalen TCH für eine Zuweisung der gewünschten Anzahl Ubertragungskanale TCH zu der Funkstation MS Frage kommen.The base station BS evaluates the access signaling channel RÄCH and signals the radio station MS one or more time slots ts, in which the radio station MS is to subsequently determine a respective characteristic value. This pre-selection of the time slots ts is possible through em a-pnon knowledge of the assignment of transmission channels in the e-wave time slots ts. For example Time slots ts in which no free transmission channel TCH is available are disregarded, whereas time slots ts with still free transmission channels TCH come into question for assigning the desired number of transmission channels TCH to the radio station MS.
über eine Bestatigungssignalisierung Access-Grant wird die Verbindungsanforderung von der Basisstation BS bestätigt und die ausgewählten Zeitschlitze ts der Funkstation MS signali- siert.The connection request is confirmed by the base station BS via an access grant confirmation signal and the selected time slots ts are signaled to the radio station MS.
Die Funkstation MS ermittelt anschließend m den signalisierten Zeitschlitzen ts einen jeweiligen charakteristischen Wert und signalisiert diesen einer Signalisierungsnachπcht Measurement Report zu der Basisstation BS .The radio station MS then determines a respective characteristic value in the signaled time slots ts and signals this to a signaling message measurement report to the base station BS.
Die Basisstation BS wertet den signalisierten Measurement Report aus und wählt aufgrund der jeweiligen charakteristischen Werte und gegebenenfalls eigenen ermittelten charaktensti- sehen Werten einen oder mehrere Zeitschlitze ts resp. Ubertragungskanale TCH aus, die sie anschließend der Funkstation MS signalisiert.The base station BS evaluates the signaled measurement report and, on the basis of the respective characteristic values and, if applicable, its own determined characteristic values, selects one or more time slots ts or. Transmission channels TCH, which it then signals to the radio station MS.
Nach dem erfolgreichen Verbindungsaufbau ermittelt die Funk- Station MS periodisch mit einem bestimmten Zeitintervall tr (bspw. tr = 2s) , das beispielsweise durch einen programmierbaren Timer m der Funkstation MS gesteuert werden kann, weitere charakteristische Werte. Hierbei kann auch eine Mittelung der ermittelten charakteristischen Werte über das Zei- tmtervall tr erfolgen.After the connection has been successfully established, the radio station MS periodically ascertains further characteristic values with a specific time interval tr (for example tr = 2s), which can be controlled, for example, by a programmable timer m of the radio station MS. The ascertained characteristic values can also be averaged over the time interval tr.
Von der Basisstation BS kann nachfolgend der Funkstation MS signalisiert werden (nicht dargestellt) , in welchen Zeitschlitzen ts die periodische Ermittlung der charakteristi- sehen Werte erfolgen soll. Hierdurch kann em schnelles In- trazell-Handover durchgeführt werden.The base station BS can subsequently signal the radio station MS (not shown) in which time slots ts the periodic determination of the characteristic see values should be done. This enables a quick intra-cell handover to be carried out.
Vorteilhaft wird durch die konkrete Angabe der Zeitschlitze ts zum einen Rechenleistung m der Funkstation MS, insbesondere m dem Idle-Mode, eingespart, zum anderen nur die m den jeweiligen Zeitschlitzen ts eine Beeinträchtigung durch Interferenz verursachenden Basisstationen BS in der Kanalzuwei- sungsprozedur berücksichtigt.On the one hand, the concrete specification of the time slots ts advantageously saves computing power m of the radio station MS, in particular m in idle mode, and on the other hand only the base stations BS causing interference with the respective time slots ts are taken into account in the channel assignment procedure.
In gleicher Weise kann das erfmdungsgemaße Verfahren bei einem netzseitigen Verbindungsaufbau durchgeführt werden, wobei von der Basisstation BS beispielsweise bereits bei der Signa- lisierung des Verbindungsaufbaus eine Signalisierung der Zeitschlitze ts erfolgen kann, m der die gerufene Funkstation MS einen jeweiligen charakteristischen Wert ermitteln soll. Hierzu kann beispielsweise die aus dem GSM-Mobilfunksy- stem bekannte Signalisierung erweitert werden. In the same way, the method according to the invention can be carried out when a connection is established on the network side, the base station BS, for example, already signaling the time slots ts when the connection is being established, with which the called radio station MS is to determine a respective characteristic value. For this purpose, the signaling known from the GSM mobile radio system can be expanded, for example.

Claims

Patentansprüche claims
1. Verfahren zur Zuweisung von zumindest einem Übertragungs¬ kanal (TCH) einem Funk-Kommunikationssystem, das e TD/CDMA-Teilnehmerseparierungsverfahren nutzt, wobei em Übertragungskanal (TCH) zumindest durch einen Zeitschlitz (ts) und einen Spreizkode (c) definiert ist, bei dem - bei einem Verbindungsaufbau von/zu einer Funkstation (MS) von einer Basisstation (BS) zumindest em bestimmter Zeitschlitz (ts) signalisiert wird, m dem mindestens em cna- rakteristischer Wert (RXLEV, RXQUAL, ta, C/I) bezüglich von Ubertragungsverhaltnissen der Funkschnittstelle zwischen der Basisstation (BS) und der Funkstation (MS) ermittelt werden soll, von der Funkstation (MS) der ermittelte charakteristische Wert (RXLEV, RXQUAL, ta, C/I) zu der Basisstation (BS) signalisiert wird, und von der Basisstation (BS) der charakteristische Wert (RXLEV, RXQUAL, ta, C/I) für die Zuweisung des Ubertragungskanals (TCH) berücksichtigt wird.1. A method for assigning at least one transmission ¬ channel (TCH) to a radio communication system, the e TD / CDMA subscriber uses, wherein em transmission channel (TCH) is at least defined by a time slot (ts) and a spread code (c), in which - when establishing a connection to / from a radio station (MS) from a base station (BS) at least em a certain time slot (ts) is signaled, m with respect to the at least em characteristic value (RXLEV, RXQUAL, ta, C / I) transmission relationships of the radio interface between the base station (BS) and the radio station (MS) are to be determined, the determined characteristic value (RXLEV, RXQUAL, ta, C / I) to the base station (BS) is signaled by the radio station (MS), and the base station (BS) takes into account the characteristic value (RXLEV, RXQUAL, ta, C / I) for the assignment of the transmission channel (TCH).
2. Verfahren nach Anspruch 1, bei dem als charakteristischer Wert (RXLEV, RXQUAL, ta, C/I) eine Interferenzsituation dem jeweiligen Zeitschlitz (ts) , ein Empfangspegel, eine Bitfehlerrate und/oder em der Signallaufzeit (ta) zwischen der Funkstation (MS) und der Basissta- tion (BS) proportionaler Wert und/oder em Signal-Rausch-Ver- haltnis bestimmt wird.2. The method according to claim 1, in which the characteristic value (RXLEV, RXQUAL, ta, C / I) is an interference situation with the respective time slot (ts), a reception level, a bit error rate and / or the signal transit time (ta) between the radio station ( MS) and the base station (BS) proportional value and / or em signal-to-noise ratio is determined.
3. Verfahren nach einem vorhergehenden Anspruch, bei dem von der Funkstation (MS) für jeden signalisierten Zeitschlitz3. The method according to any preceding claim, in which the radio station (MS) for each signaled time slot
(ts) em charakteristischer Wert (RXLEV, RXQUAL, ta, C/I) er- mittelt wird.(ts) a characteristic value (RXLEV, RXQUAL, ta, C / I) is determined.
4. Verfahren nach einem vorhergehenden Anspruch, das für Zuweisung von Ubertragungskanalen (TCH) zu Echtzeit-Dien- sten verwendet wird.4. The method according to any preceding claim is used for assigning transmission channels (TCH) to real-time services.
5. Verfahren nach einem vorhergehenden Anspruch, bei dem von der Funkstation (MS) nach einem erfolgreichen Verbin- dungsaufbau periodisch in einem bestimmten Zeitmtervall (tr) ein charakteristischer Wert (RXLEV, RXQUAL, ta, C/I) ermittelt und zu der Basisstation (BS) signalisiert wird.5. The method according to any preceding claim, in which the radio station (MS) periodically determines a characteristic value (RXLEV, RXQUAL, ta, C / I) after a successful connection establishment in a specific time interval (tr) and to the base station ( BS) is signaled.
6. Verfahren nach dem vorhergehenden Anspruch, bei dem der Funkstation (MS) die Dauer des Zeit tervalls (tr) von der Basisstation (BS) signalisiert wird.6. The method according to the preceding claim, wherein the radio station (MS) the duration of the time interval (tr) is signaled by the base station (BS).
7. Verfahren nach Anspruch 5 oder 6, bei dem der charakteristische Wert (RXLEV, RXQUAL, ta, C/I) von der Funkstation (MS) über das Zeitmtervall (tr) gemittelt wird.7. The method according to claim 5 or 6, wherein the characteristic value (RXLEV, RXQUAL, ta, C / I) is averaged by the radio station (MS) over the time interval (tr).
8. Verfahren nach einem der Ansprüche 5 bis 7, bei dem von der Funkstation (MS) zusatzlich eine Sendeleistung zα der Basisstation (BS) signaliert wird.8. The method according to any one of claims 5 to 7, in which a transmission power zα of the base station (BS) is additionally signaled by the radio station (MS).
9. Verfahren nach einem Ansprüche 5 bis 8, bei dem der Funkstation (MS) von der Basisstation (BS) signalisiert wird, in welchen Zeitschlitzen (ts) nach dem erfolgreichen Verbindungsaufbau em charakteristischer Wert (RXLEV, RXQUAL, ta, C/I) ermittelt werden soll.9. The method according to any one of claims 5 to 8, in which the radio station (MS) is signaled by the base station (BS) in which time slots (ts) after the successful establishment of the connection, a characteristic value (RXLEV, RXQUAL, ta, C / I) should be determined.
10. Verfahren nach einem vorhergehenden Anspruch, bei dem die Parameter des charakteristischen Wertes (RXLEV, RXQUAL, ta, C/I) in der Funkstation (MS) quantisiert und die quanti- sierten Werte zu der Basisstation (BS) signalisiert werden.10. The method according to any preceding claim, in which the parameters of the characteristic value (RXLEV, RXQUAL, ta, C / I) are quantized in the radio station (MS) and the quantized values are signaled to the base station (BS).
11. Verfahren nach einem vorhergehenden Anspruch, bei αe die Informationsübertragung gemäß einem TDD-Verfahren durchgeführt wird, wobei die Übertragung von der Funkstation (MS) zu der Basisstation (BS) und von der Basisstation (BS) zu der Funkstation (MS) zeitlich getrennt in einem gleichen Frequenzband (B) erfolgt. 11. The method according to any preceding claim, in which the information transmission is carried out according to a TDD method, the transmission from the radio station (MS) to the base station (BS) and from the base station (BS) to the Radio station (MS) takes place separately in the same frequency band (B).
PCT/DE2000/000743 1999-03-10 2000-03-09 Method for allocating transmission channels in a radio communications system WO2000054535A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0419243A2 (en) * 1989-09-19 1991-03-27 Nippon Telegraph And Telephone Corporation Channel assigning method
WO1998024258A2 (en) * 1996-11-25 1998-06-04 Telefonaktiebolaget Lm Ericsson (Publ) Adaptive channel allocation method and apparatus for multi-slot, multi-carrier communication system
WO1998058463A1 (en) * 1997-06-17 1998-12-23 Siemens Aktiengesellschaft Time synchronisation method for a mobile station in a mobile communications system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5276908A (en) * 1990-10-25 1994-01-04 Northern Telecom Limited Call set-up and spectrum sharing in radio communication on systems with dynamic channel allocation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0419243A2 (en) * 1989-09-19 1991-03-27 Nippon Telegraph And Telephone Corporation Channel assigning method
WO1998024258A2 (en) * 1996-11-25 1998-06-04 Telefonaktiebolaget Lm Ericsson (Publ) Adaptive channel allocation method and apparatus for multi-slot, multi-carrier communication system
WO1998058463A1 (en) * 1997-06-17 1998-12-23 Siemens Aktiengesellschaft Time synchronisation method for a mobile station in a mobile communications system

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