WO2001039523A2 - Method for signaling a radio channel structure in a radio communication system - Google Patents

Method for signaling a radio channel structure in a radio communication system Download PDF

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Publication number
WO2001039523A2
WO2001039523A2 PCT/DE2000/004227 DE0004227W WO0139523A2 WO 2001039523 A2 WO2001039523 A2 WO 2001039523A2 DE 0004227 W DE0004227 W DE 0004227W WO 0139523 A2 WO0139523 A2 WO 0139523A2
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WIPO (PCT)
Prior art keywords
radio
channel
signaling
bch
fach
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PCT/DE2000/004227
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German (de)
French (fr)
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WO2001039523A3 (en
Inventor
Reinhard KÖHN
Jörg Schniedenharn
Armin Sitte
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Siemens Aktiengesellschaft
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Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to AU28266/01A priority Critical patent/AU2826601A/en
Publication of WO2001039523A2 publication Critical patent/WO2001039523A2/en
Publication of WO2001039523A3 publication Critical patent/WO2001039523A3/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel

Definitions

  • the invention relates to a method for signaling a radio channel structure of a radio-m Remodelunikationssystern, in particular ⁇ sondere 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 a mobile station in the case of a mobile radio system.
  • the electromagnetic waves are emitted at carrier frequencies that lie in the frequency band intended for the respective system.
  • the carrier frequencies are in the range of 900 MHz, 1800 MHz and 1900 MHz.
  • carrier frequencies in the range of approx. 2000 MHz are provided.
  • the TDD mode is characterized in particular by the fact that a common frequency band is used both for signal transmission in the upward direction (UL - Uplmk) and m downward direction (DL - Downlmk), while the FDD mode uses a respective frequency band for the transmission directions.
  • certain signaling channels are transmitted in the m defined time slots by the base stations or subscriber stations.
  • the organization channel BCCH (Broadcast Control Channel), which is transmitted with a higher transmission power compared to normal traffic channels and contains information relating to the structure of the mobile radio system or the respective radio cell of a base station, also includes these signaling channels.
  • This channel BCCH is always m the first time slot of a time frame and on a ⁇ be voted carrier frequency within one m one radio cell to grouting standing frequency band sent.
  • a subscriber station determines the location (frequency and time slot) of the BCCH organizational channel in the radio cell in which it is currently located, and derives the structure of the radio interface after receiving and evaluating it.
  • the organization channel BCH beacon channel
  • the FACH forward access channel
  • further signaling channels such as the PCH (paging channel)
  • This radio channel resource is, for example, a specific spreading code in the first time slot of a time frame.
  • the invention is based on the object of specifying a method which enables simple signaling of the radio channel structure. This object is achieved by the method according to the features of independent claim 1 and by the base station system according to the features of independent claim 10. Further developments of the invention can be found in the dependent claims.
  • a base station transmits at least one signaling channel with a channel-specific format of a radio block, and a radio channel structure is derived from a receiving subscriber station based on the format of the radio block.
  • the method according to the invention advantageously enables a subscriber station to clearly identify the radio communication system when it first accesses a radio communication system based on the format of the respective radio block of the signaling channel, without additional signaling by means of a separate channel or a special signaling field in the radio blocks must be done.
  • the format also advantageously differs from the format of a normal traffic channel.
  • At least two signaling channels use the same radio channel resource according to a time-division multiplex method.
  • the subscriber station can clearly identify the respective signaling channel and thus carry out a rapid synchronization with the radio channel structure.
  • a radio channel resource can correspond to a time slot within a frequency band in the case of a simple TDMA subscriber separation method or, in the case of an additional separation according to a CDMA method, correspond to one or more spreading codes within a TDMA time slot.
  • the respective radio blocks of the signaling channels can be distinguished by an individual length or sequence of the data.
  • the subscriber station uses a known error detection mechanism, it can already make a distinction based on the length of the data within the radio block of the signaling channel. With such a mechanism, a data section that is too long or too short is rejected. Only when the length of the data matches the length expected by the mechanism is the data evaluated and forwarded to higher protocol instances. The same applies to the individual order of the data. Only when the received data is identified as correct by the mechanism is an evaluation carried out. In general it can be formulated that the error detection mechanism recognizes this data as correct and evaluates it only if the received data match the structure of the signaling channel or signaling channels sought.
  • the respective format of the signaling channel m is selected identically in all radio cells of the radio communication system or is differentiated individually for each radio cell.
  • the subscriber station can advantageously be in each radio cell Radio channel structure m can be determined in a simple manner without any special prior knowledge, while in the case of a format specific to radio cells, the subscriber station implicitly signals and thus identifies the respective radio cell, and the subscriber station is therefore able to differentiate, for example, signaling channels sent in parallel to m neighboring radio cells.
  • the method according to the invention is used particularly advantageously in a radio communication system which uses a hybrid TD / CDMA subscriber separation method.
  • FIG. 1 shows a block diagram of a radio communication system, in particular a mobile radio system
  • FIG. 2 shows an exemplary schematic representation of the frame structure of the radio interface and the structure of a radio block
  • FIG. 3 shows a sequence of several time frames with different signaling channels
  • FIG. 4 shows radio blocks of signaling channels with different data formats.
  • a mobile radio system consists in each case of a multiplicity of mobile switching centers MSC (Mobile Switchmg Center) which belong to a switching network (Switchmg Subsystem) and which are networked with one another or which provide access to a fixed network PSTN, and each of one or more connected to these mobile switching centers MSC Basisstationssyste- men BSS (Base Station Subsystem).
  • MSC Mobile Switchmg Center
  • Switchmg Subsystem switching network
  • a base station system BSS in turn has at least one device RNC (Radio Network Controller) for assigning radio resources and at least one base station NB (node B) connected to it.
  • RNC Radio Network Controller
  • a base station NB can establish and maintain connections to subscriber stations UE (user equipment) via a radio interface. At least one radio cell Z is formed by each base station NB. The size of the radio cell Z is generally determined by the range of an organization channel BCH, which is transmitted by the base stations NB with a higher and constant transmission power. In the case of a sectoring or hierarchical cell structures, several radio cells Z can also be supplied per base station NB.
  • FIG. 1 shows a subscriber station UE which is located in the radio cell Z of a base station NB.
  • the subscriber station UE has set up a communication link to the base station NB, on which a selected service is transmitted in the upward UL and downward direction DL.
  • the communication connection is separated by one or more spreading codes assigned to the subscriber station UE from communication connections established in parallel in the radio cell Z, the subscriber station UE, for example, all spreading codes currently assigned in each case in the radio cell Z for receiving the signals of its own communication association in accordance with the known Jo uses t-detection method.
  • FIG. 1 An exemplary frame structure of the radio interface, as it is realized in the TDD mode of the future UMTS mobile radio system and in a modified form in the future Chinese TD-SCDMA mobile radio system, is shown in FIG seen.
  • Each time slot ts within the frequency band B forms a frequency channel.
  • 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 fr.
  • part of the time slots tsO to tsl5 in the upward direction UL and part of the time slots tsO to tsl5 in the downward direction DL are used, the transmission in the upward direction UL taking place, for example, before the transmission in the downward direction DL.
  • a switchover point SP SP - Switchmg Point
  • SP SP - Switchmg Point
  • Timeslots ts for upward or downward direction UL, DL various asymmetrical resource allocations can be made.
  • Radio blocks fb Information of several connections m radio blocks fb are transmitted within the time slots ts.
  • the data d are spread individually with a fine structure, a spreading code c, so that a number of connections can be separated on the receiving side by this CDMA component (code division multiple access).
  • a radio channel resource is defined from the combination of a frequency channel and a spreading code c, which can be used for the transmission of signaling and useful information.
  • the spreading of individual symbols of the data d has the effect that within the symbol duration T sym Q transmit chips of the duration T chip become.
  • the Q chips form the connection-specific spreading code c.
  • a training sequence tseql In the radio blocks fb, a training sequence tseql.
  • a protection time gp is provided within the time slot ts to compensate for different signal run tents of the connections of successive time slots ts.
  • certain signaling channels such as the BCH and the FACH, use the same radio channel resource in each time frame, this always corresponding, for example, to the first spreading code m to the first time slot ts0 of a time frame fr.
  • this radio channel resource can, however, also “wander ” within the time frame for, ie, for example, change the respectively assigned time slot ts m of a certain time sequence.
  • FIG. 3 shows an exemplary sequence of several time frames frl ... fr4 for describing the use of the same radio channel resource by several signaling channels BCH, FACH, only the first time slot tsO of a respective time frame frl ... fr4 being specified in each case.
  • the signaling channels BCH and FACH use the common radio channel resource in a time division multiplex, which is defined by the first time slot tsO and the first spreading code cl.
  • a subscriber station UE which carries out an initial access to the radio communication system, first searches for the organization channel BCH, since this sends out information relevant for a subsequent connection establishment. In addition, due to its higher transmission power, this channel can also be received very well by the subscriber station UE near the radio cell boundaries.
  • the subscriber station UE is per se Note that the organization channel BCH (as described above) with the first radio channel resource of a Zeitrah ⁇ mens fr is sent, and tries to detect the control channel BCH. Since this, as shown, is not sent as in the known GSM mobile radio system m all time frames fr, the subscriber station UE may have to search successively several time frames for the organization channel BCH until it has completely detected and evaluated its information.
  • the organization channel BCH differs from, for example, the FACH by a different data length d, as is shown by way of example in FIG.
  • the organization channel BCH e n has a shorter data field than the FACH, 248 bits compared to 256 bits.
  • the error detection mechanism in the subscriber station UE is m knowledge of these lengths of the respective data fields d. If this mechanism detects a data field that is too long, for example if the FACH is received instead of the BCH, it discards the data field and tries to receive it again. This continues until the length of the received data field matches the expected length. Only then is the data field with the information hidden therein evaluated in higher protocol instances. If the length of the data fields is also varied from radio cell to radio cell, this can be done
  • Subscriber station UE assuming knowledge of the respective length, differentiate the signaling channels BCH, FACH of the respective radio cells and advantageously use this knowledge to determine a suitable radio cell for establishing a connection.

Abstract

The invention relates to method for signaling a radio channel structure in a radio communication system. According to the inventive method, at least one signaling channel with a channel-specific burst format is transmitted by a base station and a radio channel structure is derived by a receiving subscriber station by means of the burst format.

Description

Beschreibungdescription
Verfahren zur Signalisierung einer Funkkanalstruktur m einem Funk-KommunikationsSystemMethod for signaling a radio channel structure in a radio communication system
Die Erfindung betrifft ein Verfahren zur Signalisierung einer Funkkanalstruktur m einem Funk-Kommunikationssystern, insbe¬ sondere in einem Mobilfunksystem.The invention relates to a method for signaling a radio channel structure of a radio-m Kommunikationssystern, in particular ¬ sondere 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. einer Mo- bilstation für den Fall eines Mobilfunksystems, übertragen. Das Abstrahlen der elektromagnetischen Wellen erfolgt dabei mit Tragerfrequenzen, die m dem f r das jeweilige System vorgesehenen Frequenzband liegen. Beim GSM-Mobilfunksystem (Global System for Mobile Communication) liegen die Trager- frequenzen im Bereich von 900 MHz, 1800 MHz und 1900 MHz. F r zukunftige Mobilfunksysteme mit CDMA- und TD/CDMA-Ubertra- gungsverfahren über die Funkschnittstelle, wie beispielsweise das UMTS (Universal Mobile Telecommunication System) oder andere Systeme der 3. Generation sind Tragerfrequenzen im Be- reich von ca. 2000 MHz vorgesehen. Für das erwähnte UMTS-Mo- bilfunksystem wird zwischen einem sogenannten FDD-Modus (Fre- quency Division Duplex) und einem TDD-Modus (Time Division Duplex) unterschieden. Der TDD-Modus zeichnet sich insbesondere dadurch aus, daß ein gemeinsames Frequenzband sowohl für die Signalubertragung m Aufwartsrichtung (UL - Uplmk) als auch m Abwartsrichtung (DL - Downlmk) genutzt wird, wahrend der FDD-Modus für die Ubertragungsrichtungen ein jeweiliges Frequenzband nutzt. In dem erwähnten GSM-Mobilfunksystem werden bestimmte Signa- lisierungskanale m fest definierten Zeitschlitzen von den Basisstationen bzw. Teilnehmerstationen gesendet. Zu diesen Signalisierungskanalen zahlt beispielsweise auch der Organi- sationskanal BCCH (Broadcast Control Channel) , der mit einer im Vergleich zu normalen Verkehrskanalen höheren Sendeleistung gesendet wird und Informationen bez glich der Struktur des Mobilfunksystems bzw. der jeweiligen Funkzelle einer Basisstation enthalt. Dieser Organisationskanal BCCH wird immer m dem ersten Zeitschlitz eines Zeitrahmens und auf einer be¬ stimmten Tragerfrequenz innerhalb eines m einer Funkzelle zur Verfugung stehenden Frequenzbandes gesendet. Eine Teil- neh erstation ermittelt bei einem Erstzugriff auf das Mobil- funksyste den Aufenthaltsort (Frequenz und Zeitschlitz) des Organisationskanals BCCH m der Funkzelle, m der sie sich aktuell befindet, und leitet nach dessen Empfang und Auswertung die Struktur der Funkschnittstelle ab.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 a mobile station in the case of a mobile radio system. The electromagnetic waves are emitted at carrier frequencies that lie in the frequency band intended for the respective system. In the GSM mobile radio system (Global System for Mobile Communication), the carrier frequencies are in the range of 900 MHz, 1800 MHz and 1900 MHz. For future mobile radio systems with CDMA and TD / CDMA transmission methods via the radio interface, such as the UMTS (Universal Mobile Telecommunication System) or other 3rd generation systems, carrier frequencies in the range of approx. 2000 MHz are provided. For the UMTS mobile radio system mentioned, a distinction is made between a so-called FDD mode (Frequency Division Duplex) and a TDD mode (Time Division Duplex). The TDD mode is characterized in particular by the fact that a common frequency band is used both for signal transmission in the upward direction (UL - Uplmk) and m downward direction (DL - Downlmk), while the FDD mode uses a respective frequency band for the transmission directions. In the GSM mobile radio system mentioned, certain signaling channels are transmitted in the m defined time slots by the base stations or subscriber stations. The organization channel BCCH (Broadcast Control Channel), which is transmitted with a higher transmission power compared to normal traffic channels and contains information relating to the structure of the mobile radio system or the respective radio cell of a base station, also includes these signaling channels. This channel BCCH is always m the first time slot of a time frame and on a ¬ be voted carrier frequency within one m one radio cell to grouting standing frequency band sent. When accessing the mobile radio system for the first time, a subscriber station determines the location (frequency and time slot) of the BCCH organizational channel in the radio cell in which it is currently located, and derives the structure of the radio interface after receiving and evaluating it.
Bei dem zukunftigen Mobilfunksystem der dritten Generation UMTS werden voraussichtlich mehrere Signalisierungskanale eine gemeinsame Funkkanalressource nutzen. Bei dem TDD-Modus des UMTS-Mobilfunksystems werden beispielsweise der Organisationskanal BCH (Beacon Channel) und der FACH (Forward Access Channel) sowie gegebenenfalls weitere Signalisierungskanale wie der PCH (Paging Channel) eine gemeinsame Funkkanalressource gemäß einem Zeitmultiplex nutzen. Diese Funkkanalressource ist beispielsweise ein bestimmter Spreizkode m dem ersten Zeitschlitz eines Zeitrahmens. Bei einem Erstzugriff einer Teilnehmerstation ist diese aufgrund der noch unbekann- ten zeitlichen Abfolge nicht m Kenntnis, welchen Signal sie- rungskanal sie aktuell empfangt, so daß gegebenenfalls eine fehlerhafte Synchronisation bzw. Auswertung des empfangenen Signalisierungskanals sowie eine sehr lange Synchronisationszeit auftritt. Eine Losung des Problems wäre beispielsweise die Einfuhrung eines speziellen Kanals, der diese Zeitmulti- plexstruktur beschreibt, oder einer eindeutigen Markierung der jeweiligen Signalisierungskanale durch beispielsweise sogenannte Message Header m den Funkblocken der Kanäle. Beide Losungen weisen jedoch den Nachteil auf, daß sie knappe Funk- ressourcen binden, die dann nicht mehr für eine Datenübertragung zur Verf gung stehen.With the future third-generation UMTS mobile radio system, several signaling channels are likely to use a common radio channel resource. In the TDD mode of the UMTS mobile radio system, for example, the organization channel BCH (beacon channel) and the FACH (forward access channel) and, if appropriate, further signaling channels such as the PCH (paging channel) use a common radio channel resource according to a time division multiplex. This radio channel resource is, for example, a specific spreading code in the first time slot of a time frame. When a subscriber station is accessed for the first time, due to the still unknown time sequence, the subscriber station is not aware of which signal transmission channel it is currently receiving, so that incorrect synchronization or evaluation of the received signaling channel and a very long synchronization time may occur. One solution to the problem would be, for example, the introduction of a special channel that would plex structure describes, or a clear marking of the respective signaling channels by, for example, so-called message headers in the radio blocks of the channels. However, both solutions have the disadvantage that they tie up scarce radio resources, which are then no longer available for data transmission.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren anzugeben, das eine einfache Signalisierung der Funkkanalstruktur ermöglicht. Diese Aufgabe wird durch das Verfahren gemäß den Merkmalen des unabhängigen Patentanspruchs 1 sowie durch das Basisstationssystem gemäß den Merkmalen des unabhängigen Patentanspruchs 10 gelost. Weiterbildungen der Erfindung sind den abhangigen Patentansprüchen zu entnehmen.The invention is based on the object of specifying a method which enables simple signaling of the radio channel structure. This object is achieved by the method according to the features of independent claim 1 and by the base station system according to the features of independent claim 10. Further developments of the invention can be found in the dependent claims.
Erfmdungsgemaß wird von einer Basisstation zumindest ein Si- gnalisierungskanal mit einem kanalindividuellen Format eines Funkblocks ausgesendet, und von einer empfangenden Teilneh- merstation anhand des Formats des Funkblocks eine Funkkanal- Struktur abgeleitet.According to the invention, a base station transmits at least one signaling channel with a channel-specific format of a radio block, and a radio channel structure is derived from a receiving subscriber station based on the format of the radio block.
Das erfmdungsgemaße Verfahren ermöglicht vorteilhaft, daß eine Teilnehmerstation bei einem Erstzugriff auf ein Funk- Kommumkationssystem anhand des Formats des jeweiligen Funk- blocks des Signalisierungskanals diesen eindeutig erkennen kann, ohne daß eine zusätzliche Signalisierung mittels eines gesonderten Kanals oder eines speziellen Signalisierungsfel- des m den Funkblocken erfolgen muß. Vorteilhaft unterscheidet sich das Format auch von dem Format eines normalen Ver- kehrskanals.The method according to the invention advantageously enables a subscriber station to clearly identify the radio communication system when it first accesses a radio communication system based on the format of the respective radio block of the signaling channel, without additional signaling by means of a separate channel or a special signaling field in the radio blocks must be done. The format also advantageously differs from the format of a normal traffic channel.
Gemäß einer ersten Ausgestaltung der Erfindung nutzen zumindest zwei Signalisierungskanale eine gleiche Funkkanalressource gemäß einem Zeitmultiplexverfahren. Bei diesem Verfah- ren, das vorteilhaft m dem beschriebenen UMTS-Mobilfunksy- ste eingesetzt werden kann, kann die Teilnehmerstation eindeutig den jeweiligen Signalisierungskanal identifizieren, und somit eine schnelle Synchronisation auf die Funkkanalstruktur durchfuhren. Eine Funkkanalressource kann dabei bei einem einfachen TDMA-Teilneh ersepaπerungsverfahren einem Zeitschlitz innerhalb eines Frequenzbandes oder bei einer zusätzlichen Separierung nach einem CDMA-Verfahren einem oder mehreren Spreizkodes innerhalb eines TDMA-Zeitschlitzes entsprechen .According to a first embodiment of the invention, at least two signaling channels use the same radio channel resource according to a time-division multiplex method. In this method, which is advantageous in the UMTS mobile radio system described can be used, the subscriber station can clearly identify the respective signaling channel and thus carry out a rapid synchronization with the radio channel structure. A radio channel resource can correspond to a time slot within a frequency band in the case of a simple TDMA subscriber separation method or, in the case of an additional separation according to a CDMA method, correspond to one or more spreading codes within a TDMA time slot.
Gemäß zweier alternativer Ausgestaltungen der Erfindung sind die jeweiligen Funkblocke der Signalisierungskanale durch eine individuelle Lange oder Reihenfolge der Daten unterscheidbar. Nutzt die Teilnehmerstation gemäß einer weiteren Ausgestaltung einen bekannten Fehlererkennungsmechanismus, so kann sie beispielsweise schon anhand der Lange der Daten innerhalb des Funkblocks des Signalisierungskanals eine Unterscheidung durchfuhren. Ein zu langes oder zu kurzes Datenteil wird bei einem derartigen Mechanismus verworfen. Erst wenn die Lange der Daten mit der von dem Mechanismus erwarteten Lange übereinstimmt, erfolgt eine Auswertung und Weiterlei- tung der Daten an höhere Protokollmstanzen . Gleiches gilt für die individuelle Reihenfolge der Daten. Erst wenn die empfangenen Daten von dem Mechanismus als korrekt ldentifi- ziert werden, erfolgt eine Auswertung. Allgemein kann formuliert werden, daß nur wenn die empfangenen Daten mit der Struktur des oder gesuchten Signalisierungskanals bzw. Signalisierungskanale übereinstimmen, erkennt der Fehlererkennungsmechanismus diese Daten als korrekt und wertet sie aus.According to two alternative embodiments of the invention, the respective radio blocks of the signaling channels can be distinguished by an individual length or sequence of the data. According to a further embodiment, if the subscriber station uses a known error detection mechanism, it can already make a distinction based on the length of the data within the radio block of the signaling channel. With such a mechanism, a data section that is too long or too short is rejected. Only when the length of the data matches the length expected by the mechanism is the data evaluated and forwarded to higher protocol instances. The same applies to the individual order of the data. Only when the received data is identified as correct by the mechanism is an evaluation carried out. In general it can be formulated that the error detection mechanism recognizes this data as correct and evaluates it only if the received data match the structure of the signaling channel or signaling channels sought.
Gemäß zweier weiterer alternativer Ausgestaltungen wird das jeweilige Format des Signalisierungskanals m allen Funkzellen des Funk-Ko munikationssystem gleich gewählt oder funk- zellenmdividuell unterschieden. Vorteilhaft kann bei einem gleichen Format die Teilnehmerstation m jeder Funkzelle die Funkkanalstruktur m einfacher Weise ohne besondere Vorkenntnisse ermitteln, währenddessen bei einem funkzellenmdividu- ellen Format eine implizite Signalisierung und somit Identifizierung der jeweiligen Funkzelle durch die Teilnehmersta- tion erfolgt, die Teilnehmerstation demnach m der Lage ist, parallel beispielsweise m benachbarten Funkzellen gesendete Signalisierungskanale zu unterscheiden.According to two further alternative configurations, the respective format of the signaling channel m is selected identically in all radio cells of the radio communication system or is differentiated individually for each radio cell. With the same format, the subscriber station can advantageously be in each radio cell Radio channel structure m can be determined in a simple manner without any special prior knowledge, while in the case of a format specific to radio cells, the subscriber station implicitly signals and thus identifies the respective radio cell, and the subscriber station is therefore able to differentiate, for example, signaling channels sent in parallel to m neighboring radio cells.
Besonders vorteilhaft wird das erfmdungsgemaße Verfahren m einem Funk-Kommunikationssystem, das ein hybrides TD/CDMA- Teilnehmersepaπerungsverfahren nutzt, eingesetzt.The method according to the invention is used particularly advantageously in a radio communication system which uses a hybrid TD / CDMA subscriber separation method.
Das erfmdungsgemaße Verfahren und die damit zusammenwirkenden Komponenten des Funk-Kommunikationssystems werden nun an- hand von zeichnerischen Darstellungen naher erläutert. Dabei zeigenThe method according to the invention and the components of the radio communication system which interact with it will now be explained in more detail with the aid of drawings. Show
FIG 1 ein Blockschaltbild eines Funk-Kommunikationssystems, insbesondere eines Mobilfunksystems, FIG 2 eine beispielhafte schematische Darstellung der Rahmenstruktur der Funkschnittstelle und des Aufbaus eines Funkblocks, FIG 3 eine Abfolge mehrerer Zeitrahmen mit unterschiedlichen Signalisierungskanalen, und FIG 4 Funkblocke von Signalisierungskanalen mit unterschiedlichen Datenformaten.1 shows a block diagram of a radio communication system, in particular a mobile radio system, FIG. 2 shows an exemplary schematic representation of the frame structure of the radio interface and the structure of a radio block, FIG. 3 shows a sequence of several time frames with different signaling channels, and FIG. 4 shows radio blocks of signaling channels with different data formats.
Die FIG 1 zeigt einen Teil emes Mobilfunksystems als Beispiel für die Struktur eines Funk-Kommunikationssystems . Ein Mobilfunksystem besteht jeweils aus einer Vielzahl von Mobilvermittlungsstellen MSC (Mobile Switchmg Center) , die zu einem Vermittlungsnetz (Switchmg Subsystem) gehören und untereinander vernetzt sind bzw. den Zugang zu einem Festnetz PSTN herstellen, und aus jeweils einem oder mehreren mit diesen Mobilvermittlungsstellen MSC verbundenen Basisstationssyste- men BSS (Base Station Subsystem) . Ein Basisstationssystem BSS weist wiederum zumindest eine Einrichtung RNC (Radio Network Controller) zum Zuweisen von funktechnischen Ressourcen sowie zumindest eine jeweils damit verbundene Basisstation NB (Node B) auf.1 shows part of a mobile radio system as an example of the structure of a radio communication system. A mobile radio system consists in each case of a multiplicity of mobile switching centers MSC (Mobile Switchmg Center) which belong to a switching network (Switchmg Subsystem) and which are networked with one another or which provide access to a fixed network PSTN, and each of one or more connected to these mobile switching centers MSC Basisstationssyste- men BSS (Base Station Subsystem). A base station system BSS in turn has at least one device RNC (Radio Network Controller) for assigning radio resources and at least one base station NB (node B) connected to it.
Eine Basisstation NB kann ber eine Funkschnittstelle Verbindungen zu Teilnehmerstationen UE (User Equipment) aufbauen und unterhalten. Durch jede Basisstation NB wird zumindest eine Funkzelle Z gebildet. Die Große der Funkzelle Z wird m der Regel durch die Reichweite eines Organisationskanals BCH, der von den Basisstationen NB mit emer jeweils höheren und konstanten Sendeleistung gesendet wird, bestimmt. Bei einer Sektoπsierung oder bei hierarchischen Zellstrukturen können pro Basisstation NB auch mehrere Funkzellen Z versorgt werden.A base station NB can establish and maintain connections to subscriber stations UE (user equipment) via a radio interface. At least one radio cell Z is formed by each base station NB. The size of the radio cell Z is generally determined by the range of an organization channel BCH, which is transmitted by the base stations NB with a higher and constant transmission power. In the case of a sectoring or hierarchical cell structures, several radio cells Z can also be supplied per base station NB.
Das Beispiel der FIG 1 zeigt eine Teilnehmerstation UE, die sich m der Funkzelle Z einer Basisstation NB befindet. Die Teilnehmerstation UE hat eine Kommunikationsverbindung zu der Basisstation NB aufgebaut, auf der m Aufwärts- UL und Abwartsrichtung DL eine Signalubertragung eines gewählten Dienstes erfolgt. Die Kommunikationsverbindung wird durch einen oder mehrere der Teilnehmerstation UE zugeteilte Spreizkodes von parallel m der Funkzelle Z aufgebauten Kommunikationsverbindungen separiert, wobei die Teilnehmerstation UE beispielsweise alle jeweils aktuell m der Funkzelle Z zugeteilten Spreizkodes für den Empfang der Signale der eigenen Kom- unikationsverbmdung gemäß dem bekannten Jo t-Detection- Verfahren nutzt.The example in FIG. 1 shows a subscriber station UE which is located in the radio cell Z of a base station NB. The subscriber station UE has set up a communication link to the base station NB, on which a selected service is transmitted in the upward UL and downward direction DL. The communication connection is separated by one or more spreading codes assigned to the subscriber station UE from communication connections established in parallel in the radio cell Z, the subscriber station UE, for example, all spreading codes currently assigned in each case in the radio cell Z for receiving the signals of its own communication association in accordance with the known Jo uses t-detection method.
Eine beispielhafte Rahmenstruktur der Funkschnittstelle, wie sie m dem TDD-Modus des zukunftigen UMTS-Mobilfunksystem sowie m abgewandelter Form m dem zukunftigen chinesischen TD- SCDMA-Mobilfunksystem verwirklicht wird, ist aus der FIG 2 ersichtlich. Gemäß einer TDMA-Komponente ist eine Aufteilung eines breitbandigen Frequenzbandes, beispielsweise der Bandbreite B = 5 MHz, mehrere Zeitschlitze ts, beispielsweise 16 Zeitschlitze tsO bis tsl5 vorgesehen. Jeder Zeitschlitz ts innerhalb des Frequenzbandes B bildet einen Frequenzkanal. Innerhalb eines breitbandigen Frequenzbandes B werden die aufeinanderfolgenden Zeitschlitze ts nach einer Rahmenstruktur gegliedert. So werden 16 Zeitschlitze tsO bis tsl5 zu einem Zeitrahmen fr zusammengefaßt. Mehrere nachfolgende Zeitrahmen fr ergeben einen Mehrfachrahmen.An exemplary frame structure of the radio interface, as it is realized in the TDD mode of the future UMTS mobile radio system and in a modified form in the future Chinese TD-SCDMA mobile radio system, is shown in FIG seen. 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. 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 fr. Several subsequent time frames for result in a multiple frame.
Bei einer Nutzung eines TDD-Ubertragungsverfahrens wird ein Teil der Zeitschlitze tsO bis tsl5 Aufwartsrichtung UL und ein Teil der Zeitschlitze tsO bis tsl5 m Abwartsrichtung DL genutzt, wobei die Übertragung m Aufwartsrichtung UL beispielsweise vor der Übertragung m Abwartsrichtung DL erfolgt. Dazwischen liegt ein Umschaltzeitpunkt SP (SP - Switchmg Point), der entsprechend dem jeweiligen Bedarf an Uber- tragungskanalen für die Auf- und Abwartsrichtung flexibel po- sitioniert werden kann. Durch die variable Zuordnung derWhen using a TDD transmission method, part of the time slots tsO to tsl5 in the upward direction UL and part of the time slots tsO to tsl5 in the downward direction DL are used, the transmission in the upward direction UL taking place, for example, before the transmission in the downward direction DL. In between is a switchover point SP (SP - Switchmg Point), which can be flexibly positioned according to the respective need for transmission channels for the up and down direction. Through the variable assignment of the
Zeitschlitze ts f r Auf- oder Abwartsrichtung UL, DL können vielfaltige asymmetrische Ressourcenzuteilungen vorgenommen werden.Timeslots ts for upward or downward direction UL, DL, various asymmetrical resource allocations can be made.
Innerhalb der Zeitschlitze ts werden Informationen mehrerer Verbindungen m Funkblocken fb übertragen. Die Daten d sind verbmdungsmdividuell mit einer Feinstruktur, einem Spreizkode c, gespreizt, so daß e pfangsseitig eine Anzahl von Verbindungen durch diese CDMA-Komponente (code division multiple access) separierbar sind. Aus der Kombination aus einem Frequenzkanal und einem Spreizkode c wird eine Funkkanalressource definiert, die für die Übertragung von Signalisie- rungs- und Nutzinformationen genutzt werden kann. Die Spreizung von einzelnen Symbolen der Daten d bewirkt, daß mner- halb der Symboldauer Tsym Q Chips der Dauer Tchιp übertragen werden. Die Q Chips bilden dabei den verbmdungsmdividuellen Spreizkode c. In den Funkblocken fb ist weiterhin eine der Regel verb dungsmdividuelle Trainingssequenz tseql ... angeordnet, die einer empfangsseitigen Kanalschatzung dient. Wei- terhm ist innerhalb des Zeitschlitzes ts eine Schutzzeit gp zur Kompensation unterschiedlicher Signallaufzelten der Verbindungen aufeinanderfolgender Zeitschlitze ts vorgesehen. F r die Übertragung m Abwartsrichtung DL nutzen bestimmte Signalisierungskanale, wie beispielsweise der BCH und der FACH, m jedem Zeitrahmen eine gleiche Funkkanalressource, wobei diese beispielsweise immer dem ersten Spreizkode m dem ersten Zeitschlitz tsO eines Zeitrahmens fr entspricht. Um eine gleichzeitige Aussendung dieser Kanäle m benachbarten Funkzellen Z zu vermeiden, kann diese Funkkanalressource je- doch auch innerhalb des Zeitrahmens fr „wandern'", d.h. beispielsweise den jeweils zugewiesenen Zeitschlitz ts m einer bestimmten zeitlichen Abfolge andern.Information of several connections m radio blocks fb are transmitted within the time slots ts. The data d are spread individually with a fine structure, a spreading code c, so that a number of connections can be separated on the receiving side by this CDMA component (code division multiple access). A radio channel resource is defined from the combination of a frequency channel and a spreading code c, which can be used for the transmission of signaling and useful information. The spreading of individual symbols of the data d has the effect that within the symbol duration T sym Q transmit chips of the duration T chip become. The Q chips form the connection-specific spreading code c. In the radio blocks fb, a training sequence tseql. Furthermore, a protection time gp is provided within the time slot ts to compensate for different signal run tents of the connections of successive time slots ts. For the transmission in the downward direction DL, certain signaling channels, such as the BCH and the FACH, use the same radio channel resource in each time frame, this always corresponding, for example, to the first spreading code m to the first time slot ts0 of a time frame fr. In order to avoid simultaneous transmission of these channels m adjacent radio cells Z, this radio channel resource can, however, also “wander ” within the time frame for, ie, for example, change the respectively assigned time slot ts m of a certain time sequence.
In der FIG 3 ist eine beispielhafte Abfolge von mehreren Zeitrahmen frl ... fr4 zur Beschreibung der Nutzung einer gleichen Funkkanalressource durch mehrere Signalisierungskanale BCH, FACH dargestellt, wobei nur jeweils der erste Zeitschlitz tsO eines jeweiligen Zeitrahmens frl...fr4 angegeben ist. Die Signalisierungskanale BCH und FACH nutzen einem Zeitmultiplex die gemeinsame Funkkanalressource, die durch den ersten Zeitschlitz tsO und den ersten Spreizkode cl definiert ist.FIG. 3 shows an exemplary sequence of several time frames frl ... fr4 for describing the use of the same radio channel resource by several signaling channels BCH, FACH, only the first time slot tsO of a respective time frame frl ... fr4 being specified in each case. The signaling channels BCH and FACH use the common radio channel resource in a time division multiplex, which is defined by the first time slot tsO and the first spreading code cl.
Eine Teilnehmerstation UE, die einen Erstzugriff auf das Funk-Kommunikationssystem durchfuhrt, sucht zunächst den Or- ganisationskanal BCH, da dieser für einen nachfolgenden Verbindungsaufbau relevante Informationen aussendet. Zudem kann dieser Kanal aufgrund seiner höheren Sendeleistung von der Teilnehmerstation UE auch nahe der Funkzellgrenzen sehr gut empfangen werden. Die Teilnehmerstation UE ist per se Kenntnis, daß der Organisationskanal BCH mit der ersten Funkkanalressource (wie vorangehend beschrieben) eines Zeitrah¬ mens fr gesendet wird, und versucht nun den Organisationskanal BCH zu detektieren. Da dieser, wie dargestellt, nicht wie beim bekannten GSM-Mobilfunksystem m allen Zeitrahmen fr gesendet wird, muß die Teilnehmerstation UE unter Umstanden sukzessiv mehrere Zeitrahmen fr nach dem Organisationskanal BCH durchsuchen, bis sie dessen Informationen vollständig detektiert und ausgewertet hat.A subscriber station UE, which carries out an initial access to the radio communication system, first searches for the organization channel BCH, since this sends out information relevant for a subsequent connection establishment. In addition, due to its higher transmission power, this channel can also be received very well by the subscriber station UE near the radio cell boundaries. The subscriber station UE is per se Note that the organization channel BCH (as described above) with the first radio channel resource of a Zeitrah ¬ mens fr is sent, and tries to detect the control channel BCH. Since this, as shown, is not sent as in the known GSM mobile radio system m all time frames fr, the subscriber station UE may have to search successively several time frames for the organization channel BCH until it has completely detected and evaluated its information.
Der Organisationskanal BCH unterscheidet sich von beispielsweise dem FACH durch eine unterschiedliche Datenlange d, wie es der FIG 4 beispielhaft dargestellt ist. Dabei weist der Organisationskanal BCH e n im Vergleich zum FACH kürzerer Da- tenfeld, 248 bit gegenüber 256 bit, auf. Der Fehlererkennungsmechanismus in der Teilnehmerstation UE ist m Kenntnis dieser Langen der jeweiligen Datenfelder d. Detektiert dieser Mechanismus ein zu langes Datenfeld, beispielsweise wenn anstatt des BCH der FACH empfangen wird, so verwirft er das Da- tenfeld und versucht erneut einen Empfang. Dieses erfolgt so lange, bis die Lange des empfangenen Datenfeldes mit der erwarteten Lange übereinstimmt. Erst dann wird das Datenfeld mit den darin verborgenen Informationen m höheren Protokoll- mstanzen ausgewertet. Wird zusätzlich noch die Lange der Da- tenfelder von Funkzelle zu Funkzelle variiert, so kann dieThe organization channel BCH differs from, for example, the FACH by a different data length d, as is shown by way of example in FIG. The organization channel BCH e n has a shorter data field than the FACH, 248 bits compared to 256 bits. The error detection mechanism in the subscriber station UE is m knowledge of these lengths of the respective data fields d. If this mechanism detects a data field that is too long, for example if the FACH is received instead of the BCH, it discards the data field and tries to receive it again. This continues until the length of the received data field matches the expected length. Only then is the data field with the information hidden therein evaluated in higher protocol instances. If the length of the data fields is also varied from radio cell to radio cell, this can be done
Teilnehmerstation UE, die Kenntnis der jeweiligen Lange vorausgesetzt, die Signalisierungskanale BCH, FACH der jeweiligen Funkzellen unterscheiden und diese Kenntnis vorteilhaft für die Ermittlung einer geeigneten Funkzelle für einen Ver- bindungsaufbau nutzen. Subscriber station UE, assuming knowledge of the respective length, differentiate the signaling channels BCH, FACH of the respective radio cells and advantageously use this knowledge to determine a suitable radio cell for establishing a connection.

Claims

Patentansprüche claims
1. Verfahren zur Signalisierung einer Funkkanalstruktur m einem Funk-Kommunikationssystem, bei dem von einer Basisstation (NB) des Funk-Kommunikationssystems zumindest ein Signalisierungskanal (BCH, FACH) mit einem ka- nalmdividuellen Format eines Funkblocks (fb) ausgesendet wird, und von einer empfangenden Teilnehmerstation (UE) anhand des For- mats des Funkblocks (fb) die Funkkanalstruktur abgeleitet wird.1. A method for signaling a radio channel structure in a radio communication system in which at least one signaling channel (BCH, FACH) with a channel-specific format of a radio block (fb) is transmitted by a base station (NB) of the radio communication system, and by one the receiving subscriber station (UE) derives the radio channel structure based on the format of the radio block (fb).
2. Verfahren nach Anspruch 1, bei dem von zumindest zwei Signalisierungskanalen (BCH, FACH) eine gleiche Funkkanalressource gemäß einem Zeitmultiplexverfahren genutzt wird.2. The method according to claim 1, in which at least two signaling channels (BCH, FACH) use the same radio channel resource according to a time-division multiplexing method.
3. Verfahren nach Anspruch 1 oder 2, bei dem die jeweiligen Funkblocke (fb) der Signalisierungskanale (BCH, FACH) durch eine individuelle Lange von Daten (d) unterscheidbar sind.3. The method according to claim 1 or 2, wherein the respective radio blocks (fb) of the signaling channels (BCH, FACH) can be distinguished by an individual length of data (d).
4. Verfahren nach Anspruch 1 oder 2, bei dem die jeweiligen Funkblocke (fb) der Signalisierungskanale (BCH, FACH) durch eine individuelle Reihenfolge der Daten (d) unterscheidbar sind.4. The method according to claim 1 or 2, wherein the respective radio blocks (fb) of the signaling channels (BCH, FACH) can be distinguished by an individual order of the data (d).
5. Verfahren nach Anspruch 3 oder 4, bei dem von der Teilnehmerstation (UE) der jeweilige Signalisierungs- kanal (BCH, FACH) mittels eines Fehlererkennungsmechanismus detektiert wird. 5. The method according to claim 3 or 4, in which the respective signaling channel (BCH, FACH) is detected by the subscriber station (UE) by means of an error detection mechanism.
6. Verfahren nach einem vorhergehenden Anspruch, bei dem das Format des Signalisierungskanals (BCH, FACH) m allen Funkzellen (Z) des Funk-Kommunikationssystems gleich gewählt wird.6. The method according to any preceding claim, wherein the format of the signaling channel (BCH, FACH) m all radio cells (Z) of the radio communication system is chosen the same.
7. Verfahren nach einem der Ansprüche 1 bis 5, bei dem das Format des Signalisierungskanals (BCH, FACH) funkzel- lenmdividuell gewählt wird, und eine jeweilige Funkzelle (Z; anhand des Formats identifizierbar ist.7. The method according to any one of claims 1 to 5, in which the format of the signaling channel (BCH, FACH) is selected individually for the radio cells, and a respective radio cell (Z; can be identified on the basis of the format.
8. Verfahren nach einem vorhergehenden Anspruch, bei dem das Funk-Kommunikationssystem ein TDMA-basiertes Teilne mer- sepaπerungsverfahren nutzt, wobei eine Funkkanalressource durch zumindest ein Frequenzband (B) und einen Zeitschlitz (ts) definiert wird.8. The method according to any preceding claim, in which the radio communication system uses a TDMA-based subscriber separation method, a radio channel resource being defined by at least one frequency band (B) and one time slot (ts).
9. Verfahren nach einem vorhergehenden Anspruch, bei dem das Funk-Kommunikationssystem zusatzlich ein CDMA-Teilnehmer- separierungsverfahren nutzt, und dem Signalisierungskanal (BCH, FACH) zumindest ein Spreizkode (c) innerhalb eines Zeitschlitzes (tsO) des Zeitrahmens (fr) zugewiesen ist.9. The method according to any preceding claim, in which the radio communication system additionally uses a CDMA subscriber separation method, and the signaling channel (BCH, FACH) is assigned at least one spreading code (c) within a time slot (tsO) of the time frame (fr) ,
10. Basisstationssystem (BSS) eines Funk-Kommunikationssy- stems, mit zumindest einer Einrichtung (RNC) zur Zuweisung funktechnischer Ressourcen sowie zumindest einer Basisstation (NB), zur Durchfuhrung des Verfahrens nach Anspruch 1. 10. Base station system (BSS) of a radio communication system, with at least one device (RNC) for the allocation of radio resources and at least one base station (NB) for carrying out the method according to claim 1.
PCT/DE2000/004227 1999-11-29 2000-11-28 Method for signaling a radio channel structure in a radio communication system WO2001039523A2 (en)

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CN1157005C (en) 2004-07-07
WO2001039523A3 (en) 2001-10-25
CN1402916A (en) 2003-03-12
AU2826601A (en) 2001-06-04

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