WO2002076007A2 - Systeme de communication, unite de communication et procede visant a augmenter la capacite de systeme - Google Patents

Systeme de communication, unite de communication et procede visant a augmenter la capacite de systeme Download PDF

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Publication number
WO2002076007A2
WO2002076007A2 PCT/EP2002/001155 EP0201155W WO02076007A2 WO 2002076007 A2 WO2002076007 A2 WO 2002076007A2 EP 0201155 W EP0201155 W EP 0201155W WO 02076007 A2 WO02076007 A2 WO 02076007A2
Authority
WO
WIPO (PCT)
Prior art keywords
communication unit
data sequence
data
transmitted
communication
Prior art date
Application number
PCT/EP2002/001155
Other languages
English (en)
Other versions
WO2002076007A3 (fr
Inventor
Rorie O'neil
Davood Molkdar
Walter Featherstone
Original Assignee
Motorola Inc.
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 Motorola Inc. filed Critical Motorola Inc.
Priority to AU2002249178A priority Critical patent/AU2002249178A1/en
Publication of WO2002076007A2 publication Critical patent/WO2002076007A2/fr
Publication of WO2002076007A3 publication Critical patent/WO2002076007A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025—Transmission of mode-switching indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1664—Details of the supervisory signal the supervisory signal being transmitted together with payload signals; piggybacking

Definitions

  • This invention relates to capacity of radio links in wireless communication systems.
  • the invention is applicable to, but not limited to, cellular radio communication systems.
  • EGPRS Enhanced Data Rate for Global Evolution
  • WCDMA wideband code division multiplex access
  • Universal Mobile Telephone Standard include the provision of multi-code rates. This is to provide various bit pipes across a cell depending on the desired service .
  • radio links are established between some form of base station (the exact form of which depends on the type of mobile radio system) and a mobile station (also known as a mobile terminal, subscriber unit, subscriber module etc.) .
  • a base station and mobile station represent a communication unit.
  • the parts of a respective communication unit concerned with controlling the radio link established between the two communication units are referred to as the radio link control block.
  • the mobile station can be, for example, a mobile telephone.
  • coding In mobile radio systems of the types mentioned above, data to be transmitted over a radio link is coded.
  • the form of coding is specified in the coding scheme of the system standard or specification.
  • coding scheme Within a single coding scheme, there are different arrangements for different types of data, e.g. speech, control data and different channels.
  • Some types of data e.g. speech, intrinsically contain some level of redundancy.
  • the coding schemes achieve a further degree of redundancy by inserting parity data and other redundancy features. This allows for the data to be sufficiently decoded when received over the radio link, even if certain transmission errors occur.
  • the coded data is interleaved (i.e. the bursts from a particular portion of data are interleaved with data from some other portion of data to be transmitted over the same radio link) and divided into blocks which are individually transmitted in bursts. .
  • the order of the bursts can also be changed in the process of interleaving.
  • the present invention provides a mechanism to reduce the amount of data required to be transmitted over a radio link, thus allowing, for example, higher code rates to be made available across a greater percentage of a cell.
  • This invention serves to reduce the system interference by reducing the amount of coded and interleaved data that need to be transmitted for an entire information frame or other portion of data to be reliantly communicated. This is achieved by a receiving terminal attempting to decode received data before all the data has been transmitted, and providing feedback to a transmitting terminal when successful decoding is achieved, so that remaining data need not be transmitted by the transmitting terminal .
  • the present invention provides a communication method for transmitting data from a first communication unit to a second communication unit over a radio link, as claimed in claim 1.
  • the present invention provides a method for a first communication unit for transmitting data to a second communication unit over a radio link, as claimed in claim 2.
  • the present invention provides a method for a second communication unit for receiving data from a first communication unit over a radio link, as claimed in claim 3.
  • the present invention provides a communication unit, as claimed in claim 11.
  • the present invention provides a communication unit, as claimed in claim 17. In a further aspect the present invention provides a base station, as claimed in claim 20.
  • the present invention provides a mobile station, as claimed in claim 21.
  • the present invention provides a communication system, as claimed in claim 22.
  • the present invention provides a storage medium, as claimed in claim 27.
  • FIG. 1 shows a cellular communication system
  • FIG. 2 is a block diagram of a communication unit
  • FIG. 3 is a process flowchart showing process steps performed by two communication units in one embodiment of the invention.
  • FIG. 4 is a schematic illustration representing the operation of a communication unit in one embodiment of the invention.
  • the invention is applied to a cellular communication system compliant with, and containing network elements of, both UMTS and GPRS, but it is to be appreciated the invention can be applied to any system involving a radio link employing code-formed data.
  • FIG. 1 shows a cellular communication system 60 compliant with, and containing network elements of, both UMTS and GPRS.
  • a plurality of mobile stations (MS's) 62, 64, 66 communicate over radio links 18, 19, 20, 21 with a plurality of base stations, referred to under UMTS terminology as Node-B's, 22, 24, 26, 28, 30, 32.
  • the system comprises many other MS's and base stations, which for clarity are not shown.
  • the Node-B's 22-32 are connected to external networks, for example, the public-switched telephone network (PSTN) or the Internet, 34 through base station controllers, referred to under UMTS terminology as Radio Network Controller stations (RNC) , including the RNC's 36, 38, 40 and mobile switching centres (MSC's), such as MSC 42 (the others are, for clarity, not shown) and Serving GPRS Support Nodes (SGSN) such as SGSN 44 (the others are, for clarity, not shown) .
  • RNC Radio Network Controller stations
  • MSC mobile switching centres
  • SGSN Serving GPRS Support Nodes
  • Each Node-B 22-32 contains one or more transceiver units and communicates with the rest of the cell-based system infrastructure via the I U£> interface 35 as defined in the
  • Each RNC 36-40 may control one or more Node-B's 22-32.
  • Each MSC 42 provides a gateway to the external network 34, whilst the SGSN 44 links to external packet networks, in this case ones accessing the GPRS mode of the system.
  • the Operations and Management Centre (OMC) 46 is operably connected to RNC's 36-40 and Node-B's 22-32 (shown only with respect to Node-B 26 and Node-B 28 for clarity) , and administers and manages the parts of the cellular telephone communication system 60, as will be understood by those skilled in the art.
  • the Node-B's 22-32 and the MS's 62-66 have been adapted, to offer, and provide for, potential reduction in the number of coded data required to be transmitted for a given portion of data, as will be described in more detail below. More particularly, in this embodiment both the Node-B's 22-32 and the MS's 62- 66 have been adapted to implement the present invention in both transmitting and receiving modes of operation, such that in this embodiment the invention may be applied to both downlink (from Node-B to MS) and uplink (from MS to Node-B) transmissions. However, in other embodiments the invention may be applied by adapting just one of the communication units (e.g. Node-B) with respect to its transmission capabilities and the other (e.g. MS) with respect to its receiving capabilities, thereby providing the benefits of the invention in one of the two communications directions whilst simplifying each communication unit.
  • the communication units e.g. Node-B
  • MS e.g. MS
  • the adaptation may be implemented in the respective communication units in any suitable manner.
  • new apparatus may be added to a conventional communication unit, or alternatively existing parts of a conventional communication unit may be adapted, for example by reprogramming of one or more processors therein.
  • the required adaptation may be implemented in the form of processor-implementable instructions stored on a storage medium, such as a floppy disk, hard disk, PROM, RAM or any combination of these or other storage media.
  • such adaptation of transmission characteristics may alternatively be controlled, implemented in full or implemented in part by adapting any other suitable part of the communication system 60.
  • the RNC's 36-40 (or equivalent parts in other types of systems) may be adapted to provide some or all of the implementation provided in this embodiment by the Node-B's 22-30.
  • implementation may be at any appropriate node such as any other appropriate type of base station, base station controller, etc.
  • the various steps involved in determining and carrying out such adaptation can be carried out by various components distributed at different locations or entities within any suitable network or system.
  • both the Node-B's 22-30 and MS's 62-66 are adapted with respect to both transmission and reception such that the invention may be applied in both uplink and downlink direction.
  • the following description will be made in terms of downlink transmission from Node-B 26 to MS 62 over radio link 19, but it will be appreciated the description applies also to uplink transmission from MS 62 to Node-B 26.
  • Node-B 26 and MS 62 are of the same basic form with respect to aspects relevant to understanding this embodiment, and thus each constitute a basic communication unit 110 as illustrated in block diagram form in FIG. 2, and which will now be referred to in the further description of this embodiment .
  • Each communication unit 110 contains an antenna 202 coupled to a duplex filter or circulator 204 that provides isolation between receive and transmit chains within the communication unit 110.
  • the receiver chain includes scanning receiver front-end circuitry 206 (effectively providing reception, filtering and intermediate or baseband frequency conversion) .
  • the scanning front-end circuit is serially coupled to a signal processing function 208.
  • output 210 An output from the signal processing function is provided to output 210.
  • output 210 includes a loudspeaker for audio output, a display and/or a data services output.
  • output 210 comprises interface means for communicating with RNC 40.
  • the receiver chain also includes received signal strength indicator (RSSI) circuitry 212, which in turn is coupled to a controller 214 that operates to maintain overall control of the different functions and modules of the communication unit 110.
  • RSSI received signal strength indicator
  • the controller 214 is also coupled to the scanning receiver front-end circuitry 206 and the signal processing function 208 (generally realised by a digital signal processor, i.e. DSP).
  • the controller 214 includes a memory 216 that stores operating regimes, including those of interest with respect to this invention such as coding and interleaving (when transmitting) and decoding (when receiving) .
  • a timer 218 is typically coupled to the controller 214 to control the timing of operations (transmission or reception of time-dependent signals) within the communication unit 110.
  • input 220 includes a microphone for a user's voice input, and a keyboard.
  • input 220 comprises interface means for receiving communication from RNC 40.
  • the input devices are each coupled in series through transmitter/modulation circuitry 222 and a power amplifier 224 to the antenna 202.
  • the transmitter/modulation circuitry 222 and the power amplifier 224 are operationally responsive to the controller.
  • each communication unit 110 The various components within each communication unit 110 are realised in this embodiment in integrated component form. Of course, in other embodiments, they may be realized in discrete form, or a mixture of integrated components and discrete components, or indeed any other suitable form. Further, in this embodiment the controller 214 including memory 216 is implemented as a programmable processor, but in other embodiments can comprise dedicated circuitry or any other suitable form.
  • communication unit 110 i.e. Node-B 26 and MS 62
  • controller 214 including memory 216
  • the signal processing function 208 and the transmitter/modulation circuitry 222 is adapted with respect to transmission and/or reception of interleaved bursts as will be described in more detail below.
  • the process steps carried out under the present embodiment by Node-B 26 (as first communication unit, i.e. transmitting communication unit) and MS 62 (as second communication unit, i.e. receiving communication unit) will now be described with reference to the process flowchart of FIG. 3.
  • TDMA discontinuous transmission system
  • Node-B 26 codes, using encoder function 410 implemented by controller 214, a portion of data to be transmitted, which in this embodiment is an information frame 405 of frame duration T ms and frame length X bits.
  • a portion of data to be transmitted which in this embodiment is an information frame 405 of frame duration T ms and frame length X bits.
  • coding-rate identification data also included in the resulting coded bursts is coding-rate identification data (this is not required in systems with only one coding rate) .
  • the coding rate identification data is included in or inserted in the first burst to be transmitted, but may alternatively be passed in an earlier communication or during a call establishment procedure .
  • Node-B 26 interleaves the coded bursts, using interleaver function 415 implemented by controller 214.
  • N bursts are formed, of which burst 1 (431) , burst 2 (432) , burst 3 (433) and burst N (440) are shown by way of example in FIG. 4.
  • Node-B 26 starts transmitting the interleaved bursts with gaps of time elapsed between each burst, as indicated in FIG. 4.
  • Each time elapsed gap is, in this embodiment, equal to the frame duration of the information frame, but this need not be the case. Indeed, in some systems e.g. UMTS, the transmission may be continuous and not transmitted in bursts. However, it will be apparent to the person skilled in the art that the present invention is not limited to discontinuous transmission systems.
  • MS 62 commences decoding received bursts. It can do this having received just the first burst 431, because in this embodiment the coding rate identification data is included in or inserted in the first burst (in other embodiments when the coding rate identification data is inserted instead in a later burst, decoding on receipt of each burst only commences after receipt of the burst containing the coding rate identification data) .
  • MS 62 continues to decode the received data as it is received burst by burst, i.e. after receipt of the second burst 432 it attempts to decode the data on the basis of the first burst 431 and the second burst 432; after receipt of the third burst 433 it attempts to decode the data on the basis of the first burst 431, the second burst 432 and the third burst 433, and so on.
  • the data being transmitted contains redundancy and parity bits, such that MS 62 can readily determine when all the information has been decoded, which situation represents in this embodiment sufficient decoding.
  • MS 62 can readily determine when all the information has been decoded, which situation represents in this embodiment sufficient decoding.
  • any suitable predetermined or communicated criteria for determining when the data has been sufficiently decoded, even if that does not necessarily entail absolutely all the information content of the data being decoded may be employed.
  • MS 62 achieves such sufficient decoding before all N burst have been transmitted/received.
  • the MS 62 signals the successful decoding by transmitting a confirmation signal to Node-B 26.
  • transmission of the confirmation signal is implemented by it being "piggy-backed" on the existing uplink channel from MS 62 to Node-B 26, although in other embodiments this can be implemented in any suitable fashion, including use of a separate link.
  • Node-B 26 receives and processes the confirmation signal.
  • Node-B 26 ceases transmission of the remaining bursts.
  • Node-B 26 does not send any more data until it is the normal time to transmit its next information frame, at which time it transmits its next information frame using the method described above. This means that extra capacity is made available to the system in the time between ceasing transmission of the bursts of the first information frame and the start of transmission of the next frame.
  • Node-B 26 on ceasing transmission of bursts of a current information frame, Node-B 26 brings forward the start of transmission of data of the next information frame, resulting in earlier completion of transmission of all frames, which again means that extra capacity is made available to the system. Such provision of extra capacity will reduce the overall system interference and hence provide more percentage availability of higher code rates .
  • the controller 214 described in the above embodiments can be embodied in any suitable form of software, firmware or hardware.
  • the controller may be controlled by processor- implementable instructions and/or data, for carrying out the methods and processes described, which are stored in a storage medium or memory, for example the memory 216.
  • the memory can be a circuit component or module, e.g. a RAM or PROM, or a removable storage medium such as a disk, or part of a subscriber identity module (SIM) or other suitable medium.
  • SIM subscriber identity module
  • MS 62 is a mobile telephone, but the other MS's shown, and the MS's in other embodiments, may include or consist of any other form of mobile station, for example personal computers with radio modems, electronic organizers, video and/or audio players, etc.
  • the present invention can be combined advantageously with other techniques for reducing interference/increasing capacity, such as diversity, frequency hopping, power control, etc.
  • the present invention finds particular application in wireless communication systems such as the UMTS or GPRS systems.
  • inventive concepts contained herein are equally applicable to alternative fixed and wireless communication systems. Whilst the specific, and preferred, implementations of the present invention are described above, it is clear that variations and modifications of such inventive concepts could be readily applied by one skilled in the art.
  • the above described embodiment is for a time discontinuous transmission communication system.
  • the data to be transmitted is coded and interleaved on a continuous basis.
  • the interleaved data sequence may be transmitted in a continuous fashion.
  • the receiving unit will receive this continuous interleaved data and can at intervals deinterleave and decode based on the sequence received so far.
  • This decoding can extend over data bits not yet received due to the deinterleaving and if the decoding is successful the receiving unit the receiving unit can signal this to the transmitting unit .
  • the transmitting unit will cease to transmit the remaining data of this part of the data sequence and can instead substitute the redundant data for data relating to a yet unsuccessfully decoded part of the data sequence.

Abstract

L'invention concerne une première unité de communication qui code et imbrique des données à transmettre sur une liaison radio, ce qui fournit plusieurs rafales à transmettre. Les rafales sont transmises sur la liaison radio. Une seconde unité de communication décode les données reçues après réception de chaque rafale de données. Lors d'un décodage suffisant des données sur la base des rafales reçues, la seconde unité de communication transmet un signal de confirmation à la première unité de communication qui, en réponse, interrompt la transmission des rafales de données restantes. Ainsi, un nombre moins élevé de rafales doit être transmis. L'invention concerne l'utilisation des unités de communication dans des systèmes de communication radio cellulaires dotés de nombreux rendements de codage.
PCT/EP2002/001155 2001-02-23 2002-02-04 Systeme de communication, unite de communication et procede visant a augmenter la capacite de systeme WO2002076007A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002249178A AU2002249178A1 (en) 2001-02-23 2002-02-04 Communication system, communication unit and method for increasing system capacity

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0104515.2 2001-02-23
GB0104515A GB2372677B (en) 2001-02-23 2001-02-23 Communication system communication unit and method for increasing system capacity

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WO2002076007A2 true WO2002076007A2 (fr) 2002-09-26
WO2002076007A3 WO2002076007A3 (fr) 2003-01-09

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Citations (2)

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Publication number Priority date Publication date Assignee Title
WO1999014883A1 (fr) * 1997-09-18 1999-03-25 Siemens Aktiengesellschaft Decodage rapide de donnees codees par convolution, partiellement reçues
WO2000027064A1 (fr) * 1998-11-03 2000-05-11 Lucent Technologies, Inc. Systeme et procede destines a la communication sans fil qui prend en charge l'adaptation de liaison et la redondance incrementale

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JPS60125053A (ja) * 1983-12-12 1985-07-04 Canon Inc デ−タ通信方式
FI105734B (fi) * 1998-07-03 2000-09-29 Nokia Networks Oy Automaattinen uudelleenlähetys
US6282250B1 (en) * 1999-05-05 2001-08-28 Qualcomm Incorporated Low delay decoding

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999014883A1 (fr) * 1997-09-18 1999-03-25 Siemens Aktiengesellschaft Decodage rapide de donnees codees par convolution, partiellement reçues
WO2000027064A1 (fr) * 1998-11-03 2000-05-11 Lucent Technologies, Inc. Systeme et procede destines a la communication sans fil qui prend en charge l'adaptation de liaison et la redondance incrementale

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Title
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NARAYANAN K R ET AL: "Physical layer design for packet data over IS-136" VEHICULAR TECHNOLOGY CONFERENCE, 1997, IEEE 47TH PHOENIX, AZ, USA 4-7 MAY 1997, NEW YORK, NY, USA,IEEE, US, 4 May 1997 (1997-05-04), pages 1029-1033, XP010228999 ISBN: 0-7803-3659-3 *

Also Published As

Publication number Publication date
GB0104515D0 (en) 2001-04-11
GB2372677B (en) 2004-01-21
AU2002249178A1 (en) 2002-10-03
WO2002076007A3 (fr) 2003-01-09
GB2372677A (en) 2002-08-28

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