WO2001033753A1 - Procede d'egalisation des retards de propagation et d'optimisation des niveaux de puissance dans un systeme de radiocommunications - Google Patents

Procede d'egalisation des retards de propagation et d'optimisation des niveaux de puissance dans un systeme de radiocommunications Download PDF

Info

Publication number
WO2001033753A1
WO2001033753A1 PCT/EP2000/002671 EP0002671W WO0133753A1 WO 2001033753 A1 WO2001033753 A1 WO 2001033753A1 EP 0002671 W EP0002671 W EP 0002671W WO 0133753 A1 WO0133753 A1 WO 0133753A1
Authority
WO
WIPO (PCT)
Prior art keywords
network
mobile station
power level
access
signature
Prior art date
Application number
PCT/EP2000/002671
Other languages
English (en)
Inventor
Rossella De Benedittis
Original Assignee
Siemens Information And Communication Networks S.P.A.
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 Information And Communication Networks S.P.A. filed Critical Siemens Information And Communication Networks S.P.A.
Priority to JP2001535331A priority Critical patent/JP2003527789A/ja
Priority to EP00926759A priority patent/EP1226671A1/fr
Publication of WO2001033753A1 publication Critical patent/WO2001033753A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/54—Signalisation aspects of the TPC commands, e.g. frame structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0602—Systems characterised by the synchronising information used
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0866—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a dedicated channel for access

Definitions

  • This invention relates to the radio mobile telephony field, and more particularly to a method for the optimization of the «frame synchronization)) and «power level» parameters during the procedure for access to the network services by a mobile station PRIOR ART
  • the radio mobile telephony systems have undergone a constant technological evolution that has brought about a gradual abandonment of the first generation of systems, characterized by analog modulations of the transmitted carriers, replaced by second generation systems, characterized instead by digital modulations, and by extensive digital processing (DSP) of the base band signal converted to digital
  • DSP digital processing
  • the third generation systems which differ from their predecessors mainly in the different way the users of the service access the physical channels
  • the different access mode is based on a code multiplexing technique, i e the Code Division Multiple Access (CDMA) technique
  • CDMA Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • the spread spectrum technique offers the additional advantage of a greater insensitivity to Rayleigh selective fading, the latter being a phenomenon caused by multiple reflections along the air path of the transmitted signal, due to the fact that the spectral fraction concerned by the strong attenuations is only a very small part of the total spectrum occupied by the effective signal.
  • a fundamental parameter is the power level at which the Mobile Stations (MS) access the Base Station (BS).
  • the optimization of this parameter which consists in seeing to it that the mobile stations reach the network with the minimum power required for the desired quality, contributes to optimizing the system's capacity and also to saving power in the mobile station.
  • TDD Time Division Duplex
  • TDMA Time Division Multiple Access
  • another fundamental parameter is the frame synchronization between MS and BS.
  • the optimization of this parameter which consists in recovering the propagation delay due to the distance between MS and BS, contributes to reducing the mutual interferences between users attributed the same Time Slot (TS), and between users of adjacent TS.
  • optimization of the "power level” and "frame synchronization" parameters is particularly critical due to the fact that here there are no closed ring control mechanisms as is the case on the other hand with the point-to-point connections. Also, during the access, the use of shared radio resources poses the problem of collisions, i.e. those events where various users simultaneously access the same radio resource. The optimization of this parameter, consisting in minimizing the probability of occurrence, also contributes to optimizing the capacity and quality offered by the system.
  • the invention described here proposes a network access procedure, based on the physical channels and control packets (bursts) already defined in the TD-SCDMA mode, which permits values to be obtained for the "frame synchronization" and "power level” parameters to be used in the access procedure and for the first transmission on the dedicated channel, at the same time minimizing the probability of collision on shared radio resources.
  • the invention uses a method suitable for dividing the network access procedure into various temporally distinct steps.
  • the frame timing and the power level are obtained in the following way: •
  • the MS uses signature bursts, called Uplink Pilot Synchronisation (UpPTS) in the TD-SCDMA, in order to obtain the correct frame timing and the correct power level, with which to access the common channel, or Random Access Channel (RACH), so as to send the network its access request;
  • UpPTS Uplink Pilot Synchronisation
  • RACH Random Access Channel
  • the MS verifies and settles the frame timing and power level parameters, again sending a signature burst, before transmitting on the dedicated resource that it has been assigned by the network.
  • the minimization of collisions is obtained as follows.
  • the time slot is defined within which the mobile station can expect to receive an answer from the network to its signature burst; this measure contributes to optimizing the collisions in the sense that the signature bursts are shared by the mobile stations lying in the area of electromagnetic coverage of the same base station.
  • the answer message also contains the indication of the RACH physical channel on which the MS will have to send the network its access request, the collision probability on this also shared radio resource is greatly reduced.
  • the network would be reserving a shared, i.e. precious, resource for a user who in actual fact is not in a condition to access it. This state may be resolved by fixing the instant in time, or a maximum time, within which the network waits for the booked resource to be occupied, and beyond which this resource becomes available again for the users of the cell.
  • the network in its answer to the signature burst signals the level of interference recorded on the RACH access channel (or alternatively the power level that it is appropriate to transmit) about to be used by the mobile station.
  • the MS will use this value to define the power level with which to transmit on the RACH channel;
  • the network in its answer to the access request signals the level of interference recorded on the dedicated channel (or alternatively the power level that it is appropriate to transmit) assigned to the mobile station.
  • the MS will use this parameter to define the power level with which to access the dedicated channel the first time.
  • the invention is particularly, though not exclusively, suitable for the TD-SCDMA mode.
  • the innovative characteristics of this invention may be deduced from the attached Claim 1 whereas particular embodiments may be deduced from the appended Claims 2 to 16.
  • the figure 1 shows a cellular system comprising at least one base station BS and at least one mobile station MS.
  • the invention envisages two steps for optimization of the "Frame synchronization" and "Power level” parameters during the procedure for accessing network services by a mobile station.
  • the first step chiefly permits the recovery of a good frame synchronism between BS and MS and the indication by the BS of the physical, common access channel on which the MS can send its access request with a low probability of colliding or interfering with the other users of the cell.
  • the second step permits the refreshing of the above parameters, before the MS starts transmitting on the dedicated resource assigned by the network with the updated timing and power values.
  • the signature burst is comparable to a correlation word; it does not carry any information or high-level message but only a signal that allows the network to calculate the timing and power level of the signal received and to correct it accordingly.
  • numerous signature bursts with excellent auto and cross correlation properties can be sent in parallel by numerous mobile stations and correctly decoded by the network.
  • the network can answer numerous requests simultaneously, either by using numerous physical channels, code division type for example, or using a single resource in which to house a multiple answer message.
  • the MS sends the network a signature burst (UpPTS, according to the symbols adopted by CWTS for the TD-SCDMA mode) with a power level calculated according to open ring procedures well known in the CDMA systems; the frame timing is that taken from the cell synchronization process.
  • the MS waits to receive an acknowledge message from the network within N frames of the sending of the signature burst.
  • the network answers within N frames after receiving the signature burst with a confirmation message containing the same signature as used by the mobile, the correction of the frame timing, the power level to be used for the next transmission to the network, and/or the level of interference on the physical channel about to be used, and the configuration of the RACH physical channel (in terms of time slot/frequency/coding) on which to send the network services access request message, in the case that numerous physical channels have been configured in the cell for this purpose.
  • the RACH configuration parameters can be transmitted explicitly through signalling or taken implicitly from the mobile, for example because the association is known beforehand between the RACH channel to be used and the channel via which the mobile has received from the network the confirmation message to the signature burst
  • B 2 The network answers within N frames after receiving the signature burst with a refusal message containing the same signature as used by the mobile and, in some cases, an indication of the degree to which the common access channels configured in the cell are occupied, from which the MS can obtain the delay time before attempting a new access
  • the MS sends as soon as possible, or exactly M frames after receiving the answer message from the network (the strategy selected depends on the rules established in the system, which must be known beforehand to the mobile stations), its access request on the RACH physical channel indicated to it, with the synchronization and power values obtained from the parameters configured by the network It then waits to receive from the network (up to a preconfigured maximum time) the assignment of the dedicated channel At this point, two conditions are possible
  • the MS can immediately set itself in reception mode on the dedicated channel and as soon as possible, that is to say K frames after the assignment of the dedicated channel, again transmit a signature burst to update the radio parameters before transmitting on the dedicated resource
  • the MS waits for an answer from the network within X frames, and after this time interval immediately sets itself also in transmission mode on the dedicated channel the transmission will take place at any rate, even in the absence of an answer from the network
  • the parameters "K” and "X" are configured by the network so as to optimize the collision probability In order to make this "Frame synchronization" and "Power level” parameter updating procedure more effective, the values of parameters K and X must be low

Abstract

L'invention porte sur un procédé d'égalisation des retards de propagation et d'optimisation des niveaux de puissance lors de l'accès aux services d'un réseau par un poste mobile (MS) sur un canal commun dans un système cellulaire mobile de la troisième génération à technique d'accès de type AMCR ou DRT-AMRT, où la synchronisation des trames comporte au moins une station de base (BS) et au moins un poste mobile (MS). Le procédé se caractérise en ce qu'il comporte différentes étapes temporellement distinctes permettant d'optimiser les paramètres de 'synchronisation des trames' et de 'niveau de puissance' lors de la procédure d'accès aux services du réseau par le poste mobile (MS).
PCT/EP2000/002671 1999-11-03 2000-03-24 Procede d'egalisation des retards de propagation et d'optimisation des niveaux de puissance dans un systeme de radiocommunications WO2001033753A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2001535331A JP2003527789A (ja) 1999-11-03 2000-03-24 伝送遅延兼出力レベル最適化方法
EP00926759A EP1226671A1 (fr) 1999-11-03 2000-03-24 Procede d'egalisation des retards de propagation et d'optimisation des niveaux de puissance dans un systeme de radiocommunications

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1999MI002285A IT1313837B1 (it) 1999-11-03 1999-11-03 Metodo per equalizzare i ritardi di propagazione ed ottimizzare illivello di potenza in una stazione mobile che accede ai servizi di
ITMI99A002285 1999-11-03

Publications (1)

Publication Number Publication Date
WO2001033753A1 true WO2001033753A1 (fr) 2001-05-10

Family

ID=11383883

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/002671 WO2001033753A1 (fr) 1999-11-03 2000-03-24 Procede d'egalisation des retards de propagation et d'optimisation des niveaux de puissance dans un systeme de radiocommunications

Country Status (6)

Country Link
EP (1) EP1226671A1 (fr)
JP (1) JP2003527789A (fr)
CN (1) CN1322692C (fr)
CA (1) CA2324039A1 (fr)
IT (1) IT1313837B1 (fr)
WO (1) WO2001033753A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007045505A1 (fr) * 2005-10-21 2007-04-26 Telefonaktiebolaget Lm Ericsson (Publ) Technique de mise en oeuvre de procedure d'acces aleatoire sur une interface radio
EA009569B1 (ru) * 2004-12-31 2008-02-28 Сименс Акциенгезелльшафт Способ определения начального момента формирования луча в системе мобильной связи
CN100459456C (zh) * 2001-08-22 2009-02-04 诺基亚有限公司 控制无线通信系统中分组传输的方法和设备
US7912162B2 (en) 2003-09-23 2011-03-22 Nxp B.V. Initial synchronization for receivers
US20120201223A1 (en) * 2009-10-07 2012-08-09 Qualcomm Incorporated Method and Apparatus for Avoiding Physical Random Access Channel Collisions
US9800391B2 (en) 2007-04-27 2017-10-24 Huawei Technologies Co., Ltd. Method and apparatus for allocating and transmitting time and frequency resource for resource request indicator

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007124578A (ja) 2005-10-31 2007-05-17 Ntt Docomo Inc 複数の信号帯域幅を定義する無線通信システムにおける送受信帯域幅設定方法、移動端末および基地局
FR2922705B1 (fr) * 2007-10-23 2011-12-09 Sagem Defense Securite Passerelle bidirectionnelle a niveau de securite renforce
EP2096884A1 (fr) * 2008-02-29 2009-09-02 Koninklijke KPN N.V. Réseau de télécommunication et procédé d'accès de réseau en fonction du temps

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5299199A (en) * 1992-06-05 1994-03-29 Motorola, Inc. Channel re-assignment method for time division multiple access (TDMA) trunked systems
US5745837A (en) * 1995-08-25 1998-04-28 Terayon Corporation Apparatus and method for digital data transmission over a CATV system using an ATM transport protocol and SCDMA
US5912886A (en) * 1996-02-09 1999-06-15 Nec Corporation Digital mobile communication system capable of establishing mutual synchronization among a plurality of radio base stations
US5959980A (en) * 1995-06-05 1999-09-28 Omnipoint Corporation Timing adjustment control for efficient time division duplex communication

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3455227B2 (ja) * 1995-06-05 2003-10-14 ザーコム・ワイヤレス・インコーポレイテッド 無線通信の方法
JPH09198199A (ja) * 1995-11-17 1997-07-31 Matsushita Electric Ind Co Ltd マルチメディアデータ再生方法、及びマルチメディアサーバシステム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5299199A (en) * 1992-06-05 1994-03-29 Motorola, Inc. Channel re-assignment method for time division multiple access (TDMA) trunked systems
US5959980A (en) * 1995-06-05 1999-09-28 Omnipoint Corporation Timing adjustment control for efficient time division duplex communication
US5745837A (en) * 1995-08-25 1998-04-28 Terayon Corporation Apparatus and method for digital data transmission over a CATV system using an ATM transport protocol and SCDMA
US5912886A (en) * 1996-02-09 1999-06-15 Nec Corporation Digital mobile communication system capable of establishing mutual synchronization among a plurality of radio base stations

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100459456C (zh) * 2001-08-22 2009-02-04 诺基亚有限公司 控制无线通信系统中分组传输的方法和设备
US7912162B2 (en) 2003-09-23 2011-03-22 Nxp B.V. Initial synchronization for receivers
EA009569B1 (ru) * 2004-12-31 2008-02-28 Сименс Акциенгезелльшафт Способ определения начального момента формирования луча в системе мобильной связи
EP2688227A1 (fr) * 2005-10-21 2014-01-22 Telefonaktiebolaget LM Ericsson (Publ) Technique pour effectuer une procédure d'accès aléatoire sur une interface radio
US10492226B2 (en) 2005-10-21 2019-11-26 Telefonaktiebolaget Lm Ericsson (Publ) Technique for performing a random access procedure over a radio interface
US11770858B2 (en) 2005-10-21 2023-09-26 Telefonaktiebolaget Lm Ericsson (Publ) Technique for performing a random access procedure over a radio interface
US8503426B2 (en) 2005-10-21 2013-08-06 Telefonaktiebolaget L M Ericsson (Publ) Technique for performing a random access procedure over a radio interface
EP1952560B1 (fr) 2005-10-21 2013-12-11 Telefonaktiebolaget LM Ericsson (publ) Technique de mise en oeuvre de procedure d'acces aleatoire sur une interface radio
WO2007045505A1 (fr) * 2005-10-21 2007-04-26 Telefonaktiebolaget Lm Ericsson (Publ) Technique de mise en oeuvre de procedure d'acces aleatoire sur une interface radio
US20150189678A1 (en) * 2005-10-21 2015-07-02 Telefonaktiebolaget L M Ericsson (Publ) Technique for Performing a Random Access Procedure over a Radio Interface
US11246167B2 (en) 2005-10-21 2022-02-08 Telefonaktiebolaget Lm Ericsson (Publ) Technique for performing a random access procedure over a radio interface
US10219302B2 (en) 2005-10-21 2019-02-26 Telefonaktiebolaget Lm Ericsson (Publ) Technique for performing a random access procedure over a radio interface
JP4881953B2 (ja) * 2005-10-21 2012-02-22 テレフオンアクチーボラゲット エル エム エリクソン（パブル） 無線インターフェース上でランダムアクセス手順を実行する技術
US10305667B2 (en) 2007-04-27 2019-05-28 Huawei Technologies Co., Ltd. Method and apparatus for allocating and transmitting time and frequency resource for resource request indicator
US10715296B2 (en) 2007-04-27 2020-07-14 Huawei Technologies Co., Ltd. Method and apparatus for allocating and transmitting time and frequency resource for resource request indicator
US9800391B2 (en) 2007-04-27 2017-10-24 Huawei Technologies Co., Ltd. Method and apparatus for allocating and transmitting time and frequency resource for resource request indicator
US11799617B2 (en) 2007-04-27 2023-10-24 Huawei Technologies Co., Ltd. Method and apparatus for allocating and transmitting time and frequency resource for resource request indicator
US20120201223A1 (en) * 2009-10-07 2012-08-09 Qualcomm Incorporated Method and Apparatus for Avoiding Physical Random Access Channel Collisions

Also Published As

Publication number Publication date
JP2003527789A (ja) 2003-09-16
IT1313837B1 (it) 2002-09-23
ITMI992285A0 (it) 1999-11-03
CA2324039A1 (fr) 2001-05-03
CN1421076A (zh) 2003-05-28
CN1322692C (zh) 2007-06-20
ITMI992285A1 (it) 2001-05-03
EP1226671A1 (fr) 2002-07-31

Similar Documents

Publication Publication Date Title
EP3459297B1 (fr) Sélection de faisceau et de symbole pour une émission de rach
US6507601B2 (en) Collision avoidance
EP1739862B1 (fr) Procede et appareil de transfert intercellulaire en douceur dans un systeme de communication AMRC
US20030076812A1 (en) Method for optimizing the random access procedures in the cdma cellular networks
EP0926905B1 (fr) Systeme de communication mobile
KR20180088393A (ko) 공유 통신 매체를 통한 랜덤 액세스 채널 파라미터들의 시그널링
US20050143072A1 (en) Seamless handover method in an FH-OFDM based mobile communication system
EP0663737A2 (fr) Système de communications radio de mobile à mobile
EP1281289A1 (fr) Procedures de transfert dans un systeme de radiocommunication
EP1037491A1 (fr) Système cellulaire de communication à AMRC et procédé d'accès correspondant
JP2003528506A (ja) 無線通信システムにおけるアクセスチャンネルのスケジューリング
US10356823B2 (en) Random access message transmission using multiple symbols
JP2010536284A (ja) 無線セルラ通信システムにおける端末ランダムアクセス方法及びグループｉｄ生成方法
AU2019308933A1 (en) Random access method and communication device
US6496532B1 (en) Frequency hopping method and radio system
EP1226671A1 (fr) Procede d'egalisation des retards de propagation et d'optimisation des niveaux de puissance dans un systeme de radiocommunications
WO2020248944A1 (fr) Procédé et appareil d'accès aléatoire
CN112997574B (zh) 随机接入的方法、终端设备和网络设备
AU2017246410B2 (en) Scheduling request transmission to request resources for a buffer status report
WO2024073920A1 (fr) Procédés et appareils de sélection de ressources
CN114271015B (zh) 一种信息指示方法及装置、终端设备、网络设备
JPH1127752A (ja) 固定無線装置および移動無線装置を有する無線通信システム

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CN JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 2000926759

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 008151032

Country of ref document: CN

ENP Entry into the national phase

Ref country code: JP

Ref document number: 2001 535331

Kind code of ref document: A

Format of ref document f/p: F

WWE Wipo information: entry into national phase

Ref document number: 10110631

Country of ref document: US

WWP Wipo information: published in national office

Ref document number: 2000926759

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 2000926759

Country of ref document: EP