EP1307981A2 - Procede de transmission de signaux dans un systeme de radiocommunication - Google Patents

Procede de transmission de signaux dans un systeme de radiocommunication

Info

Publication number
EP1307981A2
EP1307981A2 EP01969222A EP01969222A EP1307981A2 EP 1307981 A2 EP1307981 A2 EP 1307981A2 EP 01969222 A EP01969222 A EP 01969222A EP 01969222 A EP01969222 A EP 01969222A EP 1307981 A2 EP1307981 A2 EP 1307981A2
Authority
EP
European Patent Office
Prior art keywords
channel
frequency
transmission
base station
time slot
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Withdrawn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
EP01969222A
Other languages
German (de)
English (en)
Inventor
Michael Färber
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.)
Siemens AG
Original Assignee
Siemens AG
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 filed Critical Siemens AG
Publication of EP1307981A2 publication Critical patent/EP1307981A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
    • H04B7/265—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for channel frequency control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • 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

Definitions

  • the invention relates to a method and a base station system for signal transmission in a radio communication system, in particular in a mobile radio system.
  • GSM Global System for Mobile Communications
  • This system has a subscriber separation in accordance with a TDMA method (Time Division Multiple Access), in which a frequency channel, a so-called carrier, is additionally divided into periodically recurring time slots.
  • a physical transmission channel is thus characterized by a frequency band and a time slot.
  • the radio interface is divided into eight time slots, each one
  • the first time slot of a frequency channel for the downlink ie from a base station to subscriber stations, is usually reserved for a general organization channel, the so-called BCCH (Broadcast Control Channel). This channel is used to transmit general information regarding the organization of the mobile radio system.
  • BCCH Broadcast Control Channel
  • the other physical transmission channels are used for further signaling channels and for Traffic channels (TCH - Traffic Channel) are used to transmit user data from communication links to subscriber stations.
  • the general organization channel is arranged as described in a specific time slot of a frequency channel.
  • a so-called frequency hopping method is used to improve the transmission quality.
  • the frequency channel of the traffic channels is changed from time frame to time frame, which advantageously results in a decorrelation of the multipath effect and an improvement in the transmission quality if there is a sufficient frequency spacing between the frequency channels used.
  • the invention has for its object to provide a method and a base station system that enables an improvement in the transmission quality in a radio communication system with unidirectional resource allocation. This object is achieved by the features of the method and the base station system according to the independent patent claims. Advantageous refinements of the invention can be found in the dependent claims.
  • the method according to the invention and the base station system according to the invention advantageously enable a frequency hopping method to be used for each traffic channel by the independent allocation of radio resources and parameters of a frequency hopping method for the upward and downward direction in the upward direction. This advantageously also applies to the radio resources in the time slot in which the general signaling channel is also transmitted in the downward direction.
  • the transmission quality for traffic channels in the upward direction benefits from the process gain of the frequency hopping method in a special way, since this transmission direction due to the limited transmission line the subscriber stations represents the transmission direction which is more critical with regard to the transmission quality.
  • the method according to the invention and the base station system according to the invention are used particularly advantageously in a radio communication system with a TDMA subscriber separation method, for example the GSM mobile radio system.
  • FIG. 1 shows a block diagram of a radio communication system, in particular a known GSM mobile radio system
  • FIG. 2 shows a structure of the radio interface of the GSM mobile radio system.
  • FIG. 1 shows a block diagram of a radio communication system, especially a known GSM mobile radio system.
  • this structure can be transferred to other systems in a simple manner, in which the invention can also be implemented.
  • the GSM mobile radio system consists of a large number of mobile switching centers MSC (Mobile Switching Center), which enable a transition to a wired fixed network PSTN.
  • MSC Mobile Switching Center
  • Each mobile switching center MSC is connected to a multiplicity of base station controllers BSC (Base Station Controller), each of which centrally manages radio resources for one or more base stations BS (Base Station) carry out.
  • BSC Base Station Controller
  • the base stations BS in turn enable one
  • Each base station BS forms at least one radio cell Z supplied with radio resources.
  • the subscriber stations MS are implemented, for example, as mobile radio stations or as fixed wireless network termination devices, for example a wireless subscriber line system (access network).
  • the mobile switching center MSC is also connected to an operation and maintenance center OMC (Operation and Maintenance Center), in which important parameters of the system are administered and which represents a human-machine interface.
  • OMC Opera and Maintenance Center
  • Signaling information and user data of various services are transmitted on the radio interface between the base station BS and the subscriber stations MS.
  • the base station BS periodically sends general information relating to the organization of the mobile radio system in a specific general organization channel B (BCCH - Broadcast Control Channel), which is evaluated by the subscriber stations MS.
  • Further signaling channels for example for resource allocation, are transmitted both in the downlink DL and in the uplink direction UL.
  • Traffic channels T T (TCH - Traffic Channel), in which useful information, such as voice information, are transmitted via the radio interface, take up the largest share of the available transmission capacity.
  • a control device ST according to the invention is implemented in the base station controller BSC. Based on, for example, a determined traffic load in the radio cell, the control device ST allocates the radio resources to the different channels or services.
  • the structure of the GSM radio interface is shown in FIG. This structure is based on a TDMA subscriber separation process.
  • connections are separated in time by a number of successively transmitted time slots ts0 ... ts7.
  • eight time slots ts0 ... ts7 are combined to form a time frame tf, which is transmitted periodically.
  • FIG. 2 shows two frequency channels C1, C2 and C3, C4, each for the downward direction DL and the upward direction UL, to illustrate the method according to the invention.
  • the general signaling channel B is assigned a fixed time slot tsO and a fixed frequency channel C1.
  • no frequency hopping method can be carried out for the traffic channel T in the downward direction DL in the first time slot tsO of the second frequency channel C2, since no further frequency channel is available.
  • the bidirectional allocation of the radio resources can also be used for the traffic channels T in the same way.
  • no frequency hopping method is carried out since the traffic channel T in the frequency channel C3, like the general signaling channel B, does not change the frequency channel.
  • no frequency hopping method can be used for the traffic channel T in the frequency band C4.
  • the separate allocation of radio resources for the upward UL and downward direction DL shown in the aforementioned ETSI Tdoc document is advantageously used for the method according to the invention.
  • the unidirectional channel description described therein enables the sending of two separate assignment messages to a subscriber station MS, one for the uplink direction UL and one for the downlink direction DL.
  • the subscriber station MS is informed of the resource allocation by means of these messages.
  • these assignment messages are supplemented by additional information relating to a frequency hopping method.
  • These parameters include, for example, a set of frequency channels (MA - Mobile Allocation) that is used for the frequency hopping method, information regarding an offset that defines the starting point of the frequency hopping method (MAIO - Mobile Allocation Indication Offset), and information regarding the Jump sequence (FHSN - Frequency Hopping Sequence Nu ber). These parameters are used both for the allocation of resources for the upward direction UL and for the downward direction DL.
  • the assignment messages or the parameters contained therein are advantageously described in such a way that subscriber stations, to which no unidirectional assignment is known, ignore the additional information and / or understand the assignment as a known bidirectional assignment. Subscriber stations that are able to evaluate the unidirectional assignment and the information relating to the frequency hopping method can advantageously use the frequency hopping method defined therein.

Landscapes

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

Abstract

L'invention concerne un système de radiocommunication supportant un procédé AMRT de tri d'abonnés. Dans ce système, un intervalle temporel d'un canal de fréquence (C1) pour une transmission en sens descendant est attribué à un canal de signalisation général et le même intervalle de temps d'un autre canal de fréquence correspondant pour une transmission en sens ascendant est attribué, indépendamment dudit canal, à un canal de télécommunication. De plus, lors de l'attribution des canaux, au moins un paramètre est signalisé pour un procédé de déplacement de fréquence.
EP01969222A 2000-08-07 2001-08-07 Procede de transmission de signaux dans un systeme de radiocommunication Withdrawn EP1307981A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10038483 2000-08-07
DE2000138483 DE10038483A1 (de) 2000-08-07 2000-08-07 Verfahren zur Signalübertragung in einem Funk-Kommunikationssystem
PCT/DE2001/003015 WO2002013407A2 (fr) 2000-08-07 2001-08-07 Procede de transmission de signaux dans un systeme de radiocommunication

Publications (1)

Publication Number Publication Date
EP1307981A2 true EP1307981A2 (fr) 2003-05-07

Family

ID=7651591

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01969222A Withdrawn EP1307981A2 (fr) 2000-08-07 2001-08-07 Procede de transmission de signaux dans un systeme de radiocommunication

Country Status (4)

Country Link
EP (1) EP1307981A2 (fr)
AU (1) AU2001289557A1 (fr)
DE (1) DE10038483A1 (fr)
WO (1) WO2002013407A2 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI99076C (fi) * 1994-11-25 1997-09-25 Nokia Mobile Phones Ltd Menetelmä moniaikavälikanavan osoittamiseksi TDMA-radiojärjestelmässä
FI104525B (fi) * 1996-11-13 2000-02-15 Nokia Networks Oy Taajuushyppelymenetelmä ja radiojärjestelmä
AU1563701A (en) * 1999-11-19 2001-05-30 Telefonaktiebolaget Lm Ericsson (Publ) Frequency hopping in gprs/gsm compact communications system
EP1107637A1 (fr) * 1999-12-07 2001-06-13 Motorola Semiconducteurs S.A. Réseau de communication radio avec saut de frequence sur le canal de contrôle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0213407A3 *

Also Published As

Publication number Publication date
WO2002013407A3 (fr) 2002-07-18
DE10038483A1 (de) 2002-02-21
WO2002013407A2 (fr) 2002-02-14
AU2001289557A1 (en) 2002-02-18

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