WO2000057659A1 - Procede permettant de recevoir une communication dans un systeme de telecommunication - Google Patents

Procede permettant de recevoir une communication dans un systeme de telecommunication Download PDF

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Publication number
WO2000057659A1
WO2000057659A1 PCT/DE2000/000875 DE0000875W WO0057659A1 WO 2000057659 A1 WO2000057659 A1 WO 2000057659A1 DE 0000875 W DE0000875 W DE 0000875W WO 0057659 A1 WO0057659 A1 WO 0057659A1
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WO
WIPO (PCT)
Prior art keywords
time slot
access
subscriber
time slots
rach
Prior art date
Application number
PCT/DE2000/000875
Other languages
German (de)
English (en)
Inventor
Egon Schulz
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 WO2000057659A1 publication Critical patent/WO2000057659A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
    • H04W74/0891—Non-scheduled access, e.g. ALOHA using a dedicated channel for access for synchronized access

Definitions

  • the invention relates to a method for connection establishment ⁇ acquisition between a subscriber station and a base station within a radio communication system, in particular a cellular mobile radio system, which are separated signals to be transmitted with the help of a TDMA Learnfachzugriffsver- driving, and to a corresponding radio communication system.
  • TDMA / CDMA methods which implement multiple access by combining a broadband TDMA / FDMA system with a CDMA system by additionally providing multiple access according to the CDMA method in m specific time slots.
  • Two modes are provided for flexible upward and downward transmission of the signals between the stations, frequency division duplex (FDD) and time division duplex (TDD).
  • the FDD mode is a broadband CDMA, characterized by the degrees of freedom frequency and spreading code
  • the TDD mode is a TD / CDMA method, characterized by the degrees of freedom frequency, time slot and spreading code.
  • a number of logical channels are defined for each frequency-, time- or spread-code-selective so-called physical traffic channel.
  • the logical channels are identified by the respective specific parameter group.
  • User information e.g. language, data
  • TCH useful channels
  • CCH logical control channels
  • the control channels namely the Broadcast Control Channel (BCCH)
  • BCCH Broadcast Control Channel
  • R ⁇ CH random access channel
  • the first access of a subscriber station for the purpose of establishing a connection takes place via its own logical channel.
  • the information to be transmitted is transmitted in TDD mode during the time slots in blocks with a predetermined structure, so-called bursts.
  • bursts There are different types of bursts.
  • a burst type is the access burst. It consists of data bits on which the logical channels are mapped and transmitted, a predefined and thus known training sequence which, together with front and rear tail bits, is used for bit-precise synchronization of the burst and for channel estimation, and a protection period during which no bits are transmitted.
  • the protection period ensures that signals arriving at the base station from subscriber stations of different distances arrive in the correct time relationship despite their transit time differences, so that bursts of honorary subscriber stations do not overlap in time.
  • the access burst has an extremely long protection period in order to keep the probability of collisions during random multiple access, which occur on the RACH time slot because of subscriber stations that are not time-synchronized, as low as possible.
  • the access burst is the first signal sent from a subscriber station to the base station when a connection request is notified and is transmitted on the RACH time slot used and therefore also referred to as R ⁇ CH burst.
  • the R ⁇ CH burst is defined for all radio cells in such a way that two R ⁇ CH bursts can be sent in a RACH time slot reserved for this purpose, ie one Ramba burst e half slot of a full slot.
  • a multiple division of the RACH time slot is also conceivable.
  • the RACH time slot is the same in all radio cells of a cluster.
  • the access of the subscriber stations to a half slot is arbitrary. If several subscriber stations of different radio cells transmit in a half-slot at the same time, the R ⁇ CH bursts overlap and are therefore undetectable at the receiving base stations. After a collision, the affected subscriber stations try again to send a R ⁇ CH burst. The more often the first access has to be repeated, the longer the waiting time and the more the effectiveness of this access method drops.
  • the object of the invention is to provide a method according to which the initial access in terms of the number of subscribers can be increased significantly compared to the existing RACH concept without the subscribers significantly interfering with one another when establishing a connection.
  • an RACH time slot can be dynamically divided over several radio cells of a cluster (RACH time slot clustering), which considerably reduces interference in the RACH time slot, such as collisions with neighboring radio cells
  • system information about, for example, the BCCH can be used to inform the subscriber stations on which half-slot the R ⁇ CH burst may be sent on first access also the second ha lb slot for the RACH burst.
  • a radio cell of the cluster blocks the first half-slot or the second half-slot of the R ⁇ CH for R ⁇ CH bursts, for example in the case of low traffic. Likewise, in the event of an overload, both half slots can be blocked for access. This procedure leads to an extremely dynamic locking and unlocking of RACH-
  • the principle of the invention is not limited to the application at R ⁇ CH, but can always be used when the length of a time slot is a multiple of the length of the burst to be transmitted on this resource
  • Fig. 3 A schematic representation of a R ⁇ CH burst
  • Fig. 4 An example of a R ⁇ CH burst separation
  • Fig. 6 An example of an information element in a mobile radio communication system m and
  • Fig. 7 Possible parameter values for the availability of half-slots within a R ⁇ CH.
  • the mobile radio system shown in FIG. 1 as an example of a radio communication system 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 and only one of which is shown as an example. They are at least a base station controller BSC is connected to j each case for distributing radio resources and with an operation and maintenance system OMC which Organisationsinsm- formations transmits for the mobile radio system or for parts.
  • Each base station controller BSC enables a connection to another one or more base stations BS1, BS2, BS3.
  • Each base station BS1, BS2, BS3 can via an air interface ⁇ a connection to subscriber stations MSI, MS2, MS3, for example, Mobi stations, build.
  • At least one radio cell ZI, Z2, Z3 is formed by each base station B1, B2, B3.
  • several radio cells are also supplied per base station BS.
  • 1 shows, by way of example, connections VI, V2 for the transmission of useful information and signaling information between the subscriber stations MSI, MS2 and a base station BS1, a request for resource allocation in a half-slot of the RACH timeslot (uplink in the CCH) by a further subscriber Stations MS3 and the transmission path for system information from the base station BS1 to the subscriber stations are shown in the BCCH.
  • the functionality of this structure can be transferred to other radio communication systems, in which the invention can be used.
  • m is divided into a plurality of time slots of the same duration, for example 16 time slots 1 to 16.
  • Some of the time slots are used in the downward direction DL and some of the time slots in the upward direction UL.
  • the frequency band for the downward direction DL corresponds to the frequency band for the upward direction UL.
  • the successive time slots are divided 1 to 16 according to a frame structure ⁇ by 16 time slots are combined into a time-slot frames frs.
  • a connection Before transmission of user data, however, a connection must first be established from a subscriber station MS3 to a base station BS1, BS2, BS3.
  • the subscriber station MS3 receives the signals of the organization channels BCCH of one or more base stations BS1, BS2, BS3 and measures the interference of the organization channels.
  • the radio cell ZI, Z2, Z3 with the most powerful organization channel BCCH within the cluster is selected.
  • the subscriber station MS3 then sends a R ⁇ CH burst RB in the upward direction UL in a half slot of the R ⁇ CH, which at least contains the identifier of the subscriber station MS3, for the purpose of a corresponding request for the allocation of radio resources.
  • This identifier can be supplemented by further information about the base station BS1, BS2, BS3 or via physical channels.
  • all base stations Bsl, BS2, BS3 receive the R ⁇ CH burst in the same RACH time slot, for example in the first time slot 11 after the switchover point SP that can be administered by the organization and maintenance center OMC.
  • One of the base stations BS1, BS2, BS3 decodes the transmitted RACH and assigns the subscriber station MS3 a transmission resource, that is to say a frequency band B1, B2, a time slot 1 to 10 and a subscriber code c.
  • a R ⁇ CH burst RB is shown in more detail in FIG. 3. It consists of two sections with data d, m which the receiving end be ⁇ known training sequences are embedded tseq. Furthermore, a comparatively large guard time is gp for compensating different signal propagation tents of the compounds being ⁇ depends.
  • the separation of the RACH is determined by two parameters.
  • the first parameter is the spread code c, in the TTD mode of UMTS 16 spread codes are provided.
  • the second parameter is the send time of the R CH burst. For this purpose, two times are provided in the UMTS system, the start of a time slot tO and the middle of a time slot tl. A multiple division of the time slot is also conceivable.
  • the subscriber stations MSI, MS2, Ms3 are not more than 2 km away from their base station BS1, BS2, BS3, according to the definition, if the RACH is divided, m half-slots within this radio cell radius can simultaneously have up to 32 subscribers on the RACH time slot 11 without collision access danger because one R ⁇ CH burst RB is received per half slot.
  • the RACH time slot 11 is the same in all radio cells ZI, Z2, Z3 of the cluster.
  • the invention signals at what time the R ⁇ CH burst RB may be sent by the subscriber stations MSI, MS2, MS3.
  • the R ⁇ CH burst RB is always sent at time tO and in an adjacent radio cell Z2 the R ⁇ CH burst RB is always sent at time t1 (FIG. 4).
  • the interference on the RACH time slot 11 between the two radio cells ZI, Z2 is thus decoupled.
  • the interference within this radio cell Z3, caused by the subscribers of the base stations BS1, BS2, is greatly reduced, since the RACH time slot 11 for the base station BS3 m in the first half of the RACH time slot 11 only by the subscribers in the base station BS1 and m second half of the RACH time slot 11 is only affected by subscribers of the base station BS2 and not simultaneously by the subscribers of the radio cells BS1 and BS2.
  • Participants from up to three radio cells can send their R ⁇ CH burst RB in the same physical channel, that is to say in the same RACH time slot 11, with the Ramba bursts RB with a reduced risk of collision with regard to the data components d m.
  • the RACH bursts RB can be evaluated more reliably by the base stations BS1, BS2, BS3 of the cells ZI, Z2, Z3 and the subscriber stations MSI, MS2, MS3 can be assigned one or more channels without delay.
  • the radio traffic is channeled through the allocation according to the invention of the half-slot to be used in the R CH 11.
  • the base station BS1 autonomously signals that the mobile stations MSI, MS2, MS3 are also allowed to access the second half slot of the RACH 11.
  • the radio cell Z3 blocks the first or the second half-slot of the RACHs TsO for R ⁇ CH bursts RB, for example due to low traffic volume.
  • the subscriber stations MSI, MS2, MS3 are informed of system information, for example via the BCCH, that when the R ⁇ CH burst RB is accessed for the first time either at time tO, at time tl, at both times tO, tl or at none of the times of the RACH Time slot zes 11 may be sent, so that the RACH time slot 11 is distributed over several cells ZI, Z2, Z3 to avoid interference (R ⁇ CH time slot clustering).
  • the measurements of the accesses to the RACH time slot 11 can be carried out independently by each base station BS1, BS2, BS3, as can the decisions for the allocation of one or more resources. If a decision is made, the higher-level authority BSC and the OMC can be informed. On the other hand, there is also the possibility that the traffic measurements of the higher-level entity BSC are carried out and the latter makes the appropriate decisions.
  • the decisions and the configurations with regard to the RACH time slot 11 can be carried out dynamically and, for example, can be broadcast on the BCCH or another control channel.
  • an RACH time slot 11 transmitted R ⁇ CH bursts RB differ in the temporal arrangement within the RACH time slot 11.
  • an RACH time slot 11 R ⁇ CH bursts can consist of up to three radio cells with a considerably reduced risk of collision be sent.
  • the orthogonal R ⁇ CH bursts from the radio cells ZI and Z2 no mutual impairments are to be expected.
  • Each R ⁇ CH burst RB is, for example, prescribed the transmission time tO or tl.
  • a third mobile station MS3 from the radio cell Z3 sends its R ⁇ CH burst, for example, in both half-slots of the R CH.
  • the RACH burst RB in addition to the distribution part of the slots, so examples game as half-slots, slot even within a partial of the RACH time slot (11) to each other in time or ⁇ can be sent, orthogonal, that is that the data portion d is sent first and then its guard time gp from one R ⁇ CH burst RB (FIG. 3) and the guard time gp and then the data portion d from another R ⁇ CH burst.
  • R CH slot for broadcasting on the BCCH is displayed within a system information (System Information Message).
  • System Information Message The availability or non-availability of RACH time slots for the R ⁇ CH burst indicates the subscriber stations of a radio cell m bits and bytes.
  • FIG. 7 shows which parameter values the information element IE R ⁇ CH slot according to FIG. 6, printed bits and bytes, can assume, namely: Both half slots of an RACH time slot are available, only the first half slot is available, only the second half slot is available , no half slot of the RRACH time slot is available.

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

Abstract

L'invention concerne la réception d'une communication entre une station mobile et une station de base dans un système de télécommunication fonctionnant avec un protocole d'accès multiple TDMA, dans lequel les stations mobiles envoient dans la première séquence d'accès des rafales RACH ayant la longueur partielle d'un créneau temporel RACH. A cet effet, une station de base (B1, B2, B3) attribue à une station mobile (MS1, MS2, MS3) la première séquence d'accès au créneau RACH.
PCT/DE2000/000875 1999-03-24 2000-03-21 Procede permettant de recevoir une communication dans un systeme de telecommunication WO2000057659A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19913363.8 1999-03-24
DE19913363A DE19913363A1 (de) 1999-03-24 1999-03-24 Verfahren und Einrichtung für eine Verbindungsaufnahme innerhalb eines digitalen Funk-Kommunikationssystems

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WO2000057659A1 true WO2000057659A1 (fr) 2000-09-28

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0523648A2 (fr) * 1991-07-15 1993-01-20 Nec Corporation Système de communication de données à accès aléatoire avec possibilité d'attribution d'intervalle temporel à des utilisateurs concurrents
WO1996008938A1 (fr) * 1994-09-16 1996-03-21 Ionica International Limited Procede et appareil de selection d'un canal radioelectrique
DE19723090A1 (de) * 1997-06-02 1998-12-03 Siemens Ag Verfahren, Mobilstation und Basisstation zum Verbindungsaufbau in einem Funk-Kommunikationssystem
EP0889664A2 (fr) * 1997-06-09 1999-01-07 Lucent Technologies Inc. Régulation de la congestion d'un canal d'accès pour des messages d'accuse de reception d'un teleservice diffusé

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE500565C2 (sv) * 1992-10-26 1994-07-18 Ericsson Telefon Ab L M Metod att åstadkomma slumpmässig access i ett mobilradiosystem
DE19734935A1 (de) * 1997-08-12 1999-03-04 Siemens Ag Verfahren, Mobilstation und Basisstation zur paketorientierten Übertragung von Informationen
DE19748231A1 (de) * 1997-10-31 1999-05-06 Cit Alcatel Aufbau einer Funkverbindung zwischen einem mobilen Teilnehmerendgerät und einer Funkstation
DE19817771A1 (de) * 1998-04-21 1999-11-11 Siemens Ag Verfahren und Basisstation zur Nachrichtenübertragung in einem Funk-Kommunikationssystem
DE19838832B4 (de) * 1998-08-26 2006-02-23 Robert Bosch Gmbh Verfahren zur Zuteilung von Telekommunikationsdiensten

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0523648A2 (fr) * 1991-07-15 1993-01-20 Nec Corporation Système de communication de données à accès aléatoire avec possibilité d'attribution d'intervalle temporel à des utilisateurs concurrents
WO1996008938A1 (fr) * 1994-09-16 1996-03-21 Ionica International Limited Procede et appareil de selection d'un canal radioelectrique
DE19723090A1 (de) * 1997-06-02 1998-12-03 Siemens Ag Verfahren, Mobilstation und Basisstation zum Verbindungsaufbau in einem Funk-Kommunikationssystem
EP0889664A2 (fr) * 1997-06-09 1999-01-07 Lucent Technologies Inc. Régulation de la congestion d'un canal d'accès pour des messages d'accuse de reception d'un teleservice diffusé

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DE19913363A1 (de) 2000-10-05

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