EP1312231A1 - Procede de commande d'acces dans un systeme de radiocommunication - Google Patents

Procede de commande d'acces dans un systeme de radiocommunication

Info

Publication number
EP1312231A1
EP1312231A1 EP01969245A EP01969245A EP1312231A1 EP 1312231 A1 EP1312231 A1 EP 1312231A1 EP 01969245 A EP01969245 A EP 01969245A EP 01969245 A EP01969245 A EP 01969245A EP 1312231 A1 EP1312231 A1 EP 1312231A1
Authority
EP
European Patent Office
Prior art keywords
access
base station
channel
subscriber
subscriber station
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP01969245A
Other languages
German (de)
English (en)
Inventor
Jean-Michel Traynard
Jürgen Schindler
Andreas Höynck
Jörg Schniedenharn
Georgios Papoutsis
Reinhard KÖHN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Solutions and Networks GmbH and Co KG
Original Assignee
Siemens AG
Nokia Siemens Networks GmbH and Co KG
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 AG, Nokia Siemens Networks GmbH and Co KG filed Critical Siemens AG
Publication of EP1312231A1 publication Critical patent/EP1312231A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H04W74/002—Transmission of channel access control information

Definitions

  • the invention relates to a method for access control in a radio communication system, in particular in a mobile radio system
  • information for example voice, image information or other data
  • the electromagnetic waves are emitted at carrier frequencies that lie in the frequency band provided for the respective system.
  • UMTS Universal Mobile Telecommunication System
  • 3rd generation systems frequencies in the frequency band of approx. 2000 MHz are provided.
  • TDMA time slot multiplex method
  • TDD time division duplex
  • the minimum resource unit to be allocated is specified by the number of bits that can be transmitted in a time slot.
  • the first access of the subscriber station to physical resources is of great importance in radio communication systems of the type described. Before this subscriber station logs on to the network, it is not possible for the radio communication system to assign resources to the subscriber station which may only be used by the respective subscriber station. Therefore, this first access to the network is realized with the help of random-based procedures.
  • a subscriber station sends an access block in the upward direction to a base station for the resource request.
  • the subscriber station thus signals to the network that it wishes to set up a connection.
  • Access to the time slot reserved for the transmission of the access blocks is arbitrary. If several subscriber stations transmit simultaneously in this time slot, they overlap
  • Access blocks may not be detected by the receiving base station.
  • the subscriber stations After a collision, the subscriber stations attempt to send an access block again, possibly with an increased transmission power. However, the more times the access has to be repeated, the longer the waiting time and the more the effectiveness of this access method drops.
  • TD-SCDMA Time Division Multiple Access
  • two-step procedures are used for the first access.
  • the subscriber station sends a short data sequence that is transmitted by the Subscriber station is selected randomly from a predetermined set of data sequences. These short data sequences are also called signatures. If this signature is detected by the received base station of the radio communication system, the network sends a mostly short one
  • the number of resources used for the response of the network to the subscriber station should advantageously be chosen to be as low as possible, since these resources are otherwise not available to the system. If there are no access attempts, these resources remain unused. If a small number of resources are provided for the network response and there is a high number of access attempts by several subscriber stations at a certain point in time, the network cannot allow access to all of these subscriber stations because there are not enough physical resources available to confirm access. The subscriber stations which have not been allowed access to the system within a certain time will assume that the respective connection request was not received correctly by the base station and will start the procedure again, ie they will select a signature again and send them to the base station.
  • Such subsequent transmissions are usually sent with a higher power in order to increase the probability of reception at the base station.
  • these subsequent transmissions disadvantageously increase the number of connection requests to the system as a whole, and on the other hand the probability that two Subscriber stations simultaneously select and send the same signature, which causes access collisions and the network cannot detect the connection requests.
  • the invention is therefore based on the object of increasing the efficiency of the access control. This object is achieved by the method having the features of patent claim 1. Advantageous developments of the invention can be found in the dependent patent claims.
  • each response of the network to an attempt to access a subscriber station additionally contains information about the further detected signatures. For example, only one status bit is advantageously required for each signature of the permitted signature set, which indicates that the network has also successfully detected this signature.
  • the response of the network is read by all subscriber stations that have made an access request. Based on the information in the message, each subscriber station can determine whether their request was successful. If the subscriber station recognizes that its attempt to access or its signature has been detected and the confirmation message received is not for itself, it knows that it can expect a response addressed to it in one of the following messages. Subsequent transfers of the signature can therefore advantageously be dispensed with. This has a positive effect on the efficiency of the random access procedure, since the number of access attempts is reduced.
  • Subscriber stations whose signature has not been recognized by the network can very quickly make another attempt to access, since they can very soon recognize the failure of their connection request. This advantageously shortens the access time to the network.
  • a subscriber station whose signature has been successfully detected, but which still has not received a positive response from the network after a certain time, can conclude that the power for retransmission cannot be increased since the first transmission was successfully detected.
  • FIG. 1 shows a radio communication system
  • FIG. 2 shows a flow diagram of an access control according to the invention
  • FIG. 3 shows a structure of a confirmation message.
  • the mobile radio system shown in Fig. 1 as an example of a radio communication system consists of a plurality of mobile switching centers MSC (Mobile Switching Center), which are networked with each other or provide access to a fixed network PSTN. Furthermore, these mobile switching centers MSC are each connected to at least one device RNC (radio network controller) for controlling the base stations BS (base station) and for allocating radio resources, ie a radio resource manager. Each of these devices RNC in turn enables a connection to at least one base station BS.
  • a base station BS can establish a connection to a subscriber station, for example mobile stations MS (mobile station) or other mobile and stationary terminals, via a radio interface.
  • Each base station BS supplies at least one radio cell with radio resources.
  • An operations and maintenance center OMC implements control and maintenance functions for the mobile radio system or for parts thereof.
  • the functionality of this structure can be transferred to other radio communication systems in which the invention can be used, in particular for subscriber access networks with a wireless subscriber connection and for base stations and subscriber stations operated in the unlicensed frequency range.
  • FIG. 1 shows connections for the transmission of signaling information as point-to-point connections between subscriber stations MS1, MS2 and a base station BS and an organization channel BCCH (broadcast control channel) as a point-to-multipoint connection.
  • the organization channel BCCH is transmitted with a known constant transmission power by the base station BS and contains, among other things, information about the services offered in the radio cell and about the configuration of the channels of the radio interface.
  • a channel R ⁇ CH Random Access Channel
  • FIG. 2 Based on the exemplary embodiment in FIG. 1, the method according to the invention is described in FIG. 2 with the aid of a flow chart.
  • a first subscriber station MSI selects a first signature sl from an available set of signatures for an attempt to access the base station BS or the network of the radio communication system and sends the selected signature sl in the channel for random access R ⁇ CH the base station BS.
  • a second subscriber station MS2 selects another available signature s3 and also sends this in the RACH to the base station BS.
  • the network consisting of the base station BS and the RNC, receives the two signatures sl, s3 and evaluates them.
  • the network then signals in a physical confirmation channel, for example the so-called FPACH (Forward Physical Access Channel), to the first subscriber station MSI by means of a message that it is subsequently on an individual physical channel, for example the so-called PRACH (Physical Random Access Channel), can send further messages relevant to the connection establishment to the network. Addressing is not direct, but based on the knowledge of the subscriber stations which signature they have sent to the network.
  • FPACH Forward Physical Access Channel
  • the network further signals according to the invention that the further signature s3 of the second subscriber station MS2 has also been received.
  • the second subscriber station MS2 knows that it can expect an access confirmation in one of the subsequent messages. This advantageously prevents the second subscriber station MS2 from attempting further access. However, this can be done after a predetermined period of time if no confirmation message with the signature s3 has been sent out by the base station BS within this period.
  • the second subscriber station MS2 notices that the receipt of its sent signature is not confirmed by the network If it is, it advantageously carries out another access attempt without further delay, since it can assume that the network could not receive the signature.
  • the repeated access can take place, for example, with a higher transmission power and / or by selecting a different signature.
  • the structure of a confirmation message is shown by way of example in FIG. 3.
  • the signature sl is specified in a first field of the message, the subscriber station of which is subsequently to access the individual physical transmission channel. This signature sl uniquely identifies the selected subscriber station MSI.
  • a second field contains, for example, information about the transmission power pc (power control) with which the selected subscriber station MSI is to subsequently transmit.
  • a third field contains, for example, information about a timing control ti (timing information) or information about a time of transmission.
  • Further fields contain information about the respective status of the signatures sl, s2, s3. This can be signaled, for example, in the form of a bitmap. The example in FIG.

Landscapes

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

Abstract

L'invention concerne un procédé de commande d'accès dans un système de radiocommunication, selon lequel plusieurs stations d'abonné (MS1,MS2) envoient une séquence d'accès (s1,s3) respective à une station de base (BS) du système de radiocommunication sur un canal, en vue d'un accès aléatoire. Le système de radiocommunication confirme ensuite la réception des séquences d'accès (s1,s3) sur un autre canal (FPACH), au moyen d'un message. Une station d'abonné (MS1) est sélectionnée dans le message et peut ensuite envoyer d'autres séquences à la station de base (BS) sur un canal d'accès physique (PRACH).
EP01969245A 2000-08-21 2001-08-21 Procede de commande d'acces dans un systeme de radiocommunication Withdrawn EP1312231A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10040820 2000-08-21
DE10040820A DE10040820A1 (de) 2000-08-21 2000-08-21 Verfahren zur Zugriffssteuerung in einem Funk-Kommunikationssystem
PCT/DE2001/003183 WO2002017662A1 (fr) 2000-08-21 2001-08-21 Procede de commande d'acces dans un systeme de radiocommunication

Publications (1)

Publication Number Publication Date
EP1312231A1 true EP1312231A1 (fr) 2003-05-21

Family

ID=7653148

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01969245A Withdrawn EP1312231A1 (fr) 2000-08-21 2001-08-21 Procede de commande d'acces dans un systeme de radiocommunication

Country Status (6)

Country Link
US (1) US20040017789A1 (fr)
EP (1) EP1312231A1 (fr)
CN (1) CN1242637C (fr)
AU (1) AU2001289566A1 (fr)
DE (1) DE10040820A1 (fr)
WO (1) WO2002017662A1 (fr)

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Publication number Priority date Publication date Assignee Title
US8027292B2 (en) * 2004-07-13 2011-09-27 Zte Corporation Method for reporting the frequency resource arrangement and frequency information of the multi-frequency cell
US9137822B2 (en) * 2004-07-21 2015-09-15 Qualcomm Incorporated Efficient signaling over access channel
CN100382654C (zh) * 2005-06-01 2008-04-16 中兴通讯股份有限公司 时分同步码分多址接入系统降低呼损方法
CN101426254B (zh) 2007-10-31 2010-12-08 华为技术有限公司 一种实现信息传输的方法、装置及系统
CN101426253B (zh) * 2007-10-31 2013-08-07 华为技术有限公司 一种实现信息传输的方法、装置及系统
US9867165B2 (en) * 2010-07-19 2018-01-09 Lg Electronics Inc. Method and device for transmitting a feedback signal in a multi-node system
US10773881B2 (en) * 2015-10-05 2020-09-15 Advanced Composite Structures, Llc Air cargo container and curtain for the same
US11851270B2 (en) 2017-10-10 2023-12-26 Advanced Composite Structures, Llc Latch for air cargo container doors
WO2020264346A1 (fr) 2019-06-28 2020-12-30 Advanced Composite Structures, Llc Conteneur de fret aérien thermiquement isolé

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US5642354A (en) * 1995-09-01 1997-06-24 Motorola, Inc. Enhanced access burst in a wireless communication system
DE19534156C1 (de) * 1995-09-14 1996-10-17 Siemens Ag Verfahren zur Übertragung von Datenpaketen von Mobilstationen zu Basisstationen in im Zeitlagenmultiplexverfahren betriebenen Mobilfunksystemen
US6259724B1 (en) * 1996-10-18 2001-07-10 Telefonaktiebolaget L M Ericsson (Publ) Random access in a mobile telecommunications system
US5926469A (en) * 1996-11-12 1999-07-20 Telefonaktiebolaget L/M Ericssoon (Publ) Channel resource management within a digital mobile communications network
US6031832A (en) * 1996-11-27 2000-02-29 Telefonaktiebolaget L M Ericsson (Publ) Method and apparatus for improving performance of a packet communications system
KR100546564B1 (ko) * 1998-08-17 2006-03-23 엘지전자 주식회사 이동통신 시스템에 있어서 랜덤 액세스 처리 방법
US6606313B1 (en) * 1998-10-05 2003-08-12 Telefonaktiebolaget Lm Ericsson (Publ) Random access in a mobile telecommunications system
GB9906198D0 (en) * 1999-03-18 1999-05-12 Lucent Technologies Inc Improved random access channel

Non-Patent Citations (1)

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Title
See references of WO0217662A1 *

Also Published As

Publication number Publication date
DE10040820A1 (de) 2002-03-07
CN1242637C (zh) 2006-02-15
AU2001289566A1 (en) 2002-03-04
US20040017789A1 (en) 2004-01-29
WO2002017662A1 (fr) 2002-02-28
CN1448036A (zh) 2003-10-08

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Inventor name: KOEHN, REINHARD

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Inventor name: HOEYNCK, ANDREAS

Inventor name: SCHINDLER, JUERGEN

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Inventor name: KOEHN, REINHARD

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