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WO2000054535A1 - Procede pour allouer des canaux de transmission dans un systeme de radiocommunication - Google Patents

Procede pour allouer des canaux de transmission dans un systeme de radiocommunication 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
Authority
WO
WIPO (PCT)
Prior art keywords
base station
radio
radio station
characteristic value
station
Prior art date
Application number
PCT/DE2000/000743
Other languages
German (de)
English (en)
Inventor
Markus Dillinger
Enric Mitjana
Gerald Ostermayer
Egon Schulz
Peter Slanina
Bernhard Wegmann
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2000054535A1 publication Critical patent/WO2000054535A1/fr

Links

Classifications

    • 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.

Landscapes

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

Abstract

Dans un système de radiocommunication faisant appel à un procédé de séparation des abonnés TD/AMCR, lors de l'établissement d'une communication depuis/vers une station radio, une station de base signale au moins un intervalle temporel déterminé, dans lequel il faut déterminer au moins une valeur caractéristique concernant les rapports de transmission de l'interface radio entre la station de base et la station radio. La station radio signale ensuite la valeur caractéristique déterminée à la station de base. Cette valeur caractéristique est ensuite prise en compte par la station de base pour allouer au moins un canal de transmission.
PCT/DE2000/000743 1999-03-10 2000-03-09 Procede pour allouer des canaux de transmission dans un systeme de radiocommunication WO2000054535A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19910586A DE19910586B4 (de) 1999-03-10 1999-03-10 Verfahren zur Zuweisung von Übertragungskanälen in einem Funk-Kommunikationssystem
DE19910586.3 1999-03-10

Publications (1)

Publication Number Publication Date
WO2000054535A1 true WO2000054535A1 (fr) 2000-09-14

Family

ID=7900420

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2000/000743 WO2000054535A1 (fr) 1999-03-10 2000-03-09 Procede pour allouer des canaux de transmission dans un systeme de radiocommunication

Country Status (2)

Country Link
DE (1) DE19910586B4 (fr)
WO (1) WO2000054535A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0419243A2 (fr) * 1989-09-19 1991-03-27 Nippon Telegraph And Telephone Corporation Méthode d'allocation de canal
WO1998024258A2 (fr) * 1996-11-25 1998-06-04 Telefonaktiebolaget Lm Ericsson (Publ) Procede et dispositif d'affectation adaptative des canaux dans un systeme de communication multiporteuse a plusieurs intervalles de temps
WO1998058463A1 (fr) * 1997-06-17 1998-12-23 Siemens Aktiengesellschaft Procede de synchronisation temporelle pour une station mobile dans un systeme de radiocommunication

Family Cites Families (1)

* 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 (fr) * 1989-09-19 1991-03-27 Nippon Telegraph And Telephone Corporation Méthode d'allocation de canal
WO1998024258A2 (fr) * 1996-11-25 1998-06-04 Telefonaktiebolaget Lm Ericsson (Publ) Procede et dispositif d'affectation adaptative des canaux dans un systeme de communication multiporteuse a plusieurs intervalles de temps
WO1998058463A1 (fr) * 1997-06-17 1998-12-23 Siemens Aktiengesellschaft Procede de synchronisation temporelle pour une station mobile dans un systeme de radiocommunication

Also Published As

Publication number Publication date
DE19910586A1 (de) 2000-09-21
DE19910586B4 (de) 2004-07-22

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