EP1142386A1 - Transmission de donnees a tres grande vitesse dans des systemes radiotelephoniques mobiles - Google Patents

Transmission de donnees a tres grande vitesse dans des systemes radiotelephoniques mobiles

Info

Publication number
EP1142386A1
EP1142386A1 EP00903520A EP00903520A EP1142386A1 EP 1142386 A1 EP1142386 A1 EP 1142386A1 EP 00903520 A EP00903520 A EP 00903520A EP 00903520 A EP00903520 A EP 00903520A EP 1142386 A1 EP1142386 A1 EP 1142386A1
Authority
EP
European Patent Office
Prior art keywords
base station
defragmentation
mobile radio
kbit
subchannels
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Withdrawn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
EP00903520A
Other languages
German (de)
English (en)
Inventor
Egon Schulz
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 EP1142386A1 publication Critical patent/EP1142386A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18—Service support devices; Network management devices
    • H04W88/181—Transcoding devices; Rate adaptation devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1605—Fixed allocated frame structures
    • H04J3/1623—Plesiochronous digital hierarchy [PDH]
    • H04J3/1647—Subrate or multislot multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/06—Reselecting a communication resource in the serving access point

Definitions

  • the invention relates to a method for operating a mobile radio system and to such a mobile radio system, and in particular relates to a method for transmitting high data rates in a mobile radio system.
  • GSM Global System for mobile communications
  • speech compression is carried out to reduce the data rate.
  • This speech compression is generally carried out on the one hand in the handset and on the other hand on the network side in a so-called transcoding unit (transcoding unit).
  • transcoding unit transcoding unit
  • Such a speech compression is implemented by so-called speech codecs, a 13 kbit / s speech codec being used for example in the GSM system for the fill rate service.
  • the transcoding unit In addition to speech compression, the transcoding unit also adjusts the data rate in a corresponding adaptation unit (rate adaptation).
  • rate adaptation unit has the task of adapting the data rate in the fixed network to the different data rates of the mobile radio system.
  • the network architecture of a GSM mobile radio system is shown as an example in FIG.
  • a large number of BTS base stations that serve the corresponding radio cells are connected to BCE base station controllers via Abis interfaces.
  • Speech compression and rate adaptation are carried out in transcoding units TCE.
  • the transcoding units TCE connect the base station controller BCE to the mobile station switching center (Mobile Switching Center) MSC via M interfaces and A interfaces, which the so-called Visitor Location Register, to which the temporary stay of a part can be seen from contains.
  • the Trans ⁇ is transparent coding unit TCE terms of the signaling for call control and mobility management.
  • One or more channels with 64 kbit / s of one or more PCM-30 connections (PCM-30 links) are used for signaling between the base stations BTS and the Mobile Switching Center MSC.
  • TRAU frames are exchanged between the base stations BTS and transcoding units TCE.
  • voice, data and O&M TRAU frames For speech with full data rate (fill rate
  • the net data rate is 13 kbit / s, while for data it is 12 kbit / s. Furthermore, the data rate for "half rate speech coding" is approximately 6 kbit / s.
  • the TRAU frames are mapped to 16 kbit / s channels on the interface between the transcoding unit TCE and base station BTS. As can be seen in FIG. 1, these are Abis and M interfaces. A 16 kbit / s channel is thus assigned to each traffic channel on the air interface.
  • the physical connections between base station BTS and transcoding unit TCE are generally PCM-30 connections with 30 channels, each with 64 kbit / s. Up to 4 channels with 16 kbit / s are multiplexed in each 64 kbit / s channel. Another possibility is to use ISDN connections between the transcoding unit TCE and the base station BTS.
  • the transcoding unit TCE is controlled by the base station BTS, the 16 kbit / s channels being assigned arbitrarily.
  • the invention is therefore based on the object of developing a method and a device for data transmission in mobile radio systems. to develop men who have a more favorable ratio of net to gross data rate.
  • the defragmentation i.e. Merging of subchannels
  • TRAU frames created whose overhead is significantly smaller, so that the ratio of the usable net data rate to the gross data rate is better.
  • the redundancy for synchronization and signaling remains almost constant. With a constant redundancy of 3 Kbit / s, as required for a subchannel, a net data rate of 61 kbit / s can be achieved with a terrestrial channel of 64 kbit / s.
  • Fig. 1 shows the scheme of a GSM mobile radio system
  • FIGS. 2a-2e show the method according to the invention on the basis of the channel assignments of a PCM-30 connection between a base station BTS and a transcoding unit TCE.
  • FIG. 1 The scheme of the exemplary GSM mobile radio system explained in FIG. 1 has already been explained in the introduction. However, the invention can also be used for other mobile radio systems, for example of the third generation. Mobile radio systems are also to be understood as cordless telephony systems, such as DECT (digital enhanced cordless telecommunication).
  • DECT digital enhanced cordless telecommunication
  • FIGS. 2a-2e the allocation of 6 time slots TS1-TS6, each with 64 kbit / s of a PCM-30 connection, is considered using an example from the GS M mobile radio system.
  • FIG. 2a shows the complete assignment of the exemplary 6 time slots TS1-TS6 with 4 subchannels SC each, namely aO -a3, bO-b3, cO-c3, dO-d3, eO-e3 and fO-f3, each subchannel 16 kbit / s transmits.
  • 2b shows the situation after 4 connections, namely a3, cO dl and fl, have been released. From a purely arithmetical point of view, 64 kbit / s are therefore available, but distributed over 4 time slots TS1, TS3, TS4 and TS6.
  • Fig. 2d shows the situation if more subchannels ⁇ SC, in this example, the compounds aO, a2, dO and d2, dissolved, and thus are in the time slots TSl and TS4 free channels.
  • defragmentation can be carried out using an intracell handover with cause defragmentation.
  • An intracell handover with cause defragmentation will advantageously have a lower priority than an intracell handover for quality reasons.
  • defragmentation of the terrestrial interface of a base station there is the possibility of changing certain mobile stations, which are located, for example, on the edge of a cell, i.e. apply for an Intercell handover to request to the neighboring cell.
  • the base station BTS acts as a switch.
  • the base station BTS or the base station controller BSC could send the request to change the channel on the terrestrial interface.

Landscapes

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

Abstract

L'invention concerne un procédé permettant de transmettre des données à très grande vitesse dans un système radiotéléphonique mobile avec au moins une interface terrestre entre un contrôleur de station de base et une unité de transcodage. Afin d'établir un cadre de TRAU (transcoding rate adaptation unit = unité d'adaptation de la vitesse de transcodage), l'interface terrestre est défragmentée. A cet effet, l'interface terrestre comporte une structure de fenêtre temporelle et des canaux partiels. La défragmentation de l'interface terrestre intervient par passage d'un canal partiel à l'autre.
EP00903520A 1999-01-12 2000-01-12 Transmission de donnees a tres grande vitesse dans des systemes radiotelephoniques mobiles Withdrawn EP1142386A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19900809 1999-01-12
DE19900809 1999-01-12
PCT/DE2000/000090 WO2000042793A1 (fr) 1999-01-12 2000-01-12 Transmission de donnees a tres grande vitesse dans des systemes radiotelephoniques mobiles

Publications (1)

Publication Number Publication Date
EP1142386A1 true EP1142386A1 (fr) 2001-10-10

Family

ID=7894005

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00903520A Withdrawn EP1142386A1 (fr) 1999-01-12 2000-01-12 Transmission de donnees a tres grande vitesse dans des systemes radiotelephoniques mobiles

Country Status (3)

Country Link
EP (1) EP1142386A1 (fr)
CN (1) CN1337131A (fr)
WO (1) WO2000042793A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101257657B (zh) * 2008-03-14 2012-02-29 上海华为技术有限公司 一种码变换和速率适配的方法、装置和系统

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2570141B2 (ja) * 1993-11-09 1997-01-08 日本電気株式会社 移動体通信交換システム
SE511770C2 (sv) * 1997-06-12 1999-11-22 Telia Ab Kanalallokering för ett kommunikationssystem

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0042793A1 *

Also Published As

Publication number Publication date
CN1337131A (zh) 2002-02-20
WO2000042793A1 (fr) 2000-07-20

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