WO2010043120A1 - Procédé et appareil de télécommunications - Google Patents

Procédé et appareil de télécommunications Download PDF

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Publication number
WO2010043120A1
WO2010043120A1 PCT/CN2009/070347 CN2009070347W WO2010043120A1 WO 2010043120 A1 WO2010043120 A1 WO 2010043120A1 CN 2009070347 W CN2009070347 W CN 2009070347W WO 2010043120 A1 WO2010043120 A1 WO 2010043120A1
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WIPO (PCT)
Prior art keywords
message
control message
data structure
user
ack
Prior art date
Application number
PCT/CN2009/070347
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English (en)
Inventor
Guang Liu
Original Assignee
Huawei Technologies Co., Ltd.
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 Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to CN200980139266.1A priority Critical patent/CN102187592B/zh
Priority to BRPI0920585A priority patent/BRPI0920585A2/pt
Publication of WO2010043120A1 publication Critical patent/WO2010043120A1/fr

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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
    • 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
    • H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/12—Messaging; Mailboxes; Announcements
    • 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
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals

Definitions

  • the present invention relates to conversational service over packet-switched, PS, networks. Particularly, it relates to technology for sending and receiving a control message in a PS network.
  • conversational service is a service that provides two-way, interactive, real-time, end-to-end information transfer.
  • the conversational voice service enables routing of voice conversations over the Internet or any other IP network.
  • the voice data flows over a PS network, instead of traditional circuit- switched, CS, voice transmission lines.
  • a user of a voice conversation occupies a fixed bandwidth during the whole conversation.
  • a network supporting packet switched conversational voice service such as voice over IP, VoIP
  • a user of a voice conversation occupies bandwidth when the user transmits data but does not occupy bandwidth when not transmitting data. So different users or different services share the same bandwidth, thus, the bandwidth is supposed to be efficiently used.
  • a network supports conversational voice service if the network can send voice frames, for example Adaptive Multi Rate, AMR, frames, half rate, HR, frames and full rate, FR, frames, from a speaking party to a listening party of a voice conversation timely and correctly, with latency less than 300ms and a Frame Error Rate,
  • voice frames for example Adaptive Multi Rate, AMR, frames, half rate, HR, frames and full rate, FR, frames
  • FER of less than 2%.
  • measures to fulfill the two requirements are often counteracting. For example, to reduce the FER, incorrect data blocks may be retransmitted, but retransmission requires more time and increases the latency.
  • Downlink is a transmission path for the transmission of signals from the network to the UE while the transmission path in direction from the UE to the network is referred as uplink.
  • a user equipment device UE
  • wants a network to retransmit a downlink data block when the data block is not received correctly the UE needs to respond to the network whether the data block is received correctly or not.
  • ACK acknowledgement
  • NACK negative acknowledgement
  • ACK/NACK information e.g. 1 represents ACK
  • 0 represents NACK.
  • the response must be sent to the network as soon as possible to make the retransmission finish as soon as possible.
  • GSM EDGE Enhanced Data Rates for Global Evolution
  • GERAN Enhanced Data Rates for Global Evolution
  • FANR Fast ACK/NACK Report
  • the FANR refers to the possibility to include, in a radio block for data transfer sent in one direction, piggy-backed ACK/NACK, PAN, information relative to a temporary block flow, TBF, with FANR activated in the other direction.
  • a TDMA frame is a radio frame containing bursts for eight time slots. Four consecutive appearances of the same time slot within four consecutive TDMA frames is termed one radio block.
  • a radio block carries one Radio Link Control, RLC, or Medium Access Control, MAC, protocol data unit, PDU. Each MAC/RLC PDU may comprise one or more data blocks.
  • GPRS For transmission of one or more data blocks, resources are reserved on one or more packet data channels, PDCHs.
  • PDCHs Packet Data channels
  • GPRS uses a 52-multiframe structure, where each frame is a TDMA frame. The GPRS resource allocation is done on block level.
  • the FANR function is achieved by inserting a PAN field in a radio block.
  • Each PAN responds RLC/MAC data blocks to confirm whether the RLC/MAC data blocks are received correctly or not.
  • the PAN information is usually sent frequently. Thereby, a response can be sent timely for retransmission of incorrect data blocks to be accomplished in time.
  • Figure 1 illustrates communication between a UE and Base Station Subsystem BSS when a user participating in a voice conversation is listening but not speaking.
  • a PAN comprises 20 bits and is usually sent for every uplink voice data blocks, if any.
  • the UE sends some dummy blocks carrying PAN information to the BSS, although the user is not speaking.
  • a dummy data block has 184 bits, and occupies a whole radio block.
  • the UE goes into a discontinuous transmission DTX mode when the user does not speak. In DTX mode, the UE sends uplink data infrequently. No voice data blocks but silence data blocks which contain background noise information are sent in DTX mode.
  • the network needs to allocated radio resource for the user as soon as possible.
  • the FER of received frames may be less than 2%, which satisfies the requirement of VoIP technology. There is no need of retransmission in such situation and FANR is not used.
  • the BSS still has to allocate uplink resources frequently for a user also if the user is not speaking for the user to be capable of reporting a positive voice activity to the BSS when he becomes active speaker. In brief, uplink resources are occupied even if a user is not speaking in prior art.
  • a problem in prior art is that uplink resources are allocated to a user when the user is listening but not speaking.
  • the uplink resource is not efficiently used.
  • a data structure for sending a control message to a communications network comprises at least one of an ACK/NACK message for one or more received data blocks, a voice activity message and a user ID message.
  • the data structure is sent to the communications network in particular bit interval allocation of a packet timing advanced control channel/uplink, PTCCH/U, or an idle frame, wherein the PTCCH/U is an uplink channel used for transmission of one or more random access bursts and the idle frame and the idle frame is a periodically arranged time interval in a TDMA frame structure for the UE to measure on or search for neighbor cells.
  • Preferred user equipment for sending a control message to a communications network and BSS for receiving a control message from a UE are provided according to embodiments of the invention.
  • the user equipment comprises a data structure generating unit configured to generate a predefined data structure carrying a control message and a data structure sending unit configured to send the data structure in particular bit interval allocation of a PTCCH/U or an idle frame
  • the BSS comprises a receiving unit configured to a predefined data structure for carrying a control message from a UE.
  • Figure 1 illustrates communication between a UE and BSS when a user in a voice conversation is listening but not speaking.
  • Figure 2 illustrates a multiframe structure in prior art.
  • Figure 3 illustrates prior art structure of an access burst sent in a timeslot T.
  • Figure 4 illustrates communication between a UE and BSS according to a first embodiment of the invention.
  • Figure 5 illustrates data blocks received in six radio blocks when downlink TBF is in basic transmission time interval configuration according to an embodiment of the invention.
  • Figure 6 illustrates data blocks received in three radio blocks when downlink TBF is in reduced transmission time interval configuration according to an embodiment of the invention.
  • Figure 7 illustrates communication between a UE and BSS according to a second embodiment of the invention.
  • Figure 8 illustrates an example structure of a piggyback burst according to a first embodiment of the invention.
  • Figure 9 illustrates an example structure of a piggyback burst according to a second embodiment of the invention.
  • Figure 10 illustrates structure of an access burst according to an embodiment of the invention.
  • Figure 11 illustrates a UE for sending a control message to a communications network according to an embodiment of the invention.
  • Figure 12 illustrates a BSS for receiving a control message from a UE according to an embodiment of the invention.
  • An embodiment of the invention provides a method for sending a control message to a communications network independently of uplink resource allocation.
  • a predefined data structure such as a burst
  • carrying the control message is sent from a UE participating in a conversational service to the network through a PTCCH/U or an idle frame, where the PTCCH/U is an uplink channel used to transmit one or more random access bursts and the idle frame is periodically arranged in a frame structure to facilitate for the UE to measure on or search for neighbor cells.
  • the control message comprises at least one of an ACK/NACK message for one or more received data blocks and a voice activity message.
  • the ACK/NACK message or voice activity message is preferably reported to the network using idle uplink resources without allocating uplink channel resources for data transmission.
  • the control message may further comprise a user identity, ID, message.
  • Figure 2 illustrates a multiframe structure of prior art. Timeslots BO to BIl (201,
  • timeslots T which constitute PTCCH/U
  • timeslots X which constitute idle frame
  • a UE measures on or searches for adjacent cells but does not transmit any signal.
  • the data structure carrying the control message is sent in timeslots T (205) forming PTCCH/U.
  • Figure 3 illustrates the structure of an AB sent in timeslot T (205) of the prior art.
  • An AB comprises 8 extended tail bits, TB (301), 41 synchronization sequence bits (302), 36 encrypted bits (303), 3 tail bits, TB(304) and a guard period GP (305) for 68.25 bits. ) It is identified that an AB does not occupy a whole timeslot T and allocation of a GP (305) provides an option to send a data structure for sending the control message.
  • the data structure is sent in timeslots X (206, 208), forming idle frames.
  • the UE does not transmit any signal.
  • the timeslot X provides a resource option for sending the data structure carrying the control message.
  • control message carried in the data structure comprises at least one of an ACK/NACK message and a voice activity message.
  • the ACK/NACK message represents whether one or more data blocks are received correctly
  • the voice activity message represents whether a voice activity is detected.
  • the ACK/NACK message represents whether one or more data blocks are received correctly
  • the voice activity message represents whether a voice activity is detected.
  • ACK/NACK message is carried in a PAN field
  • the voice activity message is carried in a cause field.
  • the control message may further comprise a user ID field in case there is a user ID message.
  • the PAN field comprises one or more bits, each bit representing an ACK/NACK message for one or more data blocks.
  • a UE may receive one or more data blocks in a radio block.
  • Each bit of the PAN field preferably represents an ACK/NACK message for a data block in a radio block, which means that if all data blocks in a radio block are received correctly, the value of the respective bits corresponding to the radio blocks represents ACK; otherwise, the value of the bit corresponding to a radio block for which an error is detected represents NACK.
  • each bit of the PAN field corresponds to a radio block, for example, three bits represent an ACK/NACK message for received data blocks in three radio blocks.
  • two bits of the PAN field represent an ACK/NACK message for a radio block.
  • six bits represent ACK/NACK messages for received data blocks in three radio blocks.
  • each of the two ACK/NACK bits preferably corresponds to a data block.
  • the two bits preferably represent an ACK/NACK message for the data block, such as "00" representing NACK and "11" representing ACK.
  • the set of data blocks is preferably divided into two groups and each of the respective two bits represents an ACK/NACK message for the groups of data blocks.
  • Figure 4 illustrates example communication between a UE and BSS according to a first embodiment of the invention.
  • a control message carried in the data structure comprises 3 bits of a PAN field.
  • the BSS sends radio blocks 1, 2 and 3 to the UE (401,402, 403) and the data blocks in radio blocks 1 and 2 are correctly received, but not all the data blocks in radio block 3.
  • the UE then sends a data structure (404) carrying an ACK/NACK message for the received radio blocks 1, 2 and 3.
  • the preferred values of the 3 bits in the PAN field for this non-exclusive example are 1, 1 and 0, where 1 represents ACK and 0 represents NACK.
  • Figure 5 illustrates data blocks transmitted from the BSS in six radio blocks when the downlink TBF is in basic transmission time interval, BTTI, configuration.
  • six data blocks are transmitted from a packet data channel PDCH.
  • Data blocks Bl (501), B2 (502) and B3 (503) are transmitted in the first three radio blocks and a first data structure carrying a first ACK/NACK message is sent from UE in timeslot Tl (504).
  • the first ACK/NACK message corresponds to data blocks Bl (501), B2 (502) and B3 (503).
  • example data block B4 (505), B5 (506) and B6 (507) are received and a second data structure carrying a second ACK/NACK message is sent from UE in timeslot T2 (508).
  • the bit content of the second ACK/NACK message corresponds to receive status of data blocks B4 (505), B5 (506) and B6 (507).
  • Figure 6 illustrates data blocks transmitted from BSS in three radio blocks when the downlink TBF is in reduced transmission time interval RTTI configuration.
  • a radio block is sent on a PDCH pair, consisting of PDCHi and PDCHj, in one RTTI block period.
  • the RTTI period is half of a BTTI radio block.
  • data blocks BIa (601), B2a (603) and B3a (605) are sent in the first RTTI block periods and data blocks BIb (602), B2b (604) and B3b (606) are sent in the first RTTI block periods.
  • Data blocks BIa (601) and BIb (602) are transmitted from the BSS in the first BTTI radio block
  • data blocks B2a (603) and B2b (604) are transmitted from the BSS in the second BTTI radio block
  • data blocks B3a (605) and B3b (606) are transmitted from the BSS in the third BTTI radio block.
  • a first data structure carrying a first ACK/NACK message is sent in uplink direction in timeslot Tl (607) and a second data structure carrying a second ACK/NACK message is sent in uplink direction in timeslot T2 (608).
  • the first ACK/NACK message corresponds to data blocks BIa (601), B2a (603) and Ba (605)
  • the second ACK/NACK message corresponds to data blocks BIb (602), B2b (604) and B3b (606).
  • the control message carried in the data structure further comprises a voice activity message.
  • Figure 7 illustrates example communication between a UE and BSS according to the second embodiment of the invention.
  • the voice activity message is preferably carried in a cause field representing whether a voice activity is detected. E.g. with positive logic, when a voice activity is detected, the value of the cause field is set to 1 ; otherwise, the value of the cause field is set to 0.
  • a data structure comprising a control message is sent when any data block in the radio blocks is received incorrectly or when a voice activity is detected.
  • the BSS sends (701,702) example radio blocks 1 and 2 to the UE.
  • the data blocks in radio blocks 1 and 2 are assumed correctly received in the illustrated example, and the BSS sends example radio block 3 (703) to the UE but not all the example data blocks in radio block 3 are correctly received.
  • the UE then sends a data structure (704) to the BSS with 3 bits of PAN field being 1, 1, and 0 and the value content of the cause filed being 0.
  • the BSS continues to send radio blocks 4, 5 and 6 to the UE (705,706,707) and all the data blocks in radio blocks 4, 5 and 6 are correctly received (705-707).
  • the UE then sends a data structure (708) with 3 bits PAN field being 1, 1, and 1 and the value of cause filed being 1.
  • the ACK/NACK message for one or more received data blocks and the voice activity are reported in one or more control messages without allocating any uplink data channel resource.
  • BSS knows that the user will start to talk and timely allocates uplink data channel resources to the UE.
  • control message carried in the data structure further comprises a user ID message.
  • User IDs are used to distinguish different users sharing an uplink channel.
  • the user ID field comprises one or more bits.
  • the user ID field comprises one bit and the value of 0 represents one of two users who share an uplink channel while the value of 1 represents the other user.
  • the user ID field preferably comprises more bits in case several users share an uplink channel. For example, two bits in the user ID field can represent four different users. Usually, there are not too many users sharing an uplink channel due to associated latency increase.
  • a user ID is allocated to a user by the BSS or generated as a default.
  • a data structure for sending a control message to a network is provided.
  • the data structure preferably provided with redundancy for forward error control during transmission and parity check bits for error detection to enable retransmission upon error detection.
  • the data structure is a piggyback burst, PB, the PB preferably comprising 16 bits arranged for carrying the control message.
  • the piggyback burst may, in particular, improve utilization of short and otherwise blank periods of e.g. uplink PTCCH/U of legacy systems, such as GERAN systems.
  • the control message comprises at least one of an ACK/NACK message for one or more received data blocks, a voice activity message as described in detail above.
  • each PB carries five message bits.
  • the PB comprises encoded bits corresponding to encoding as follows.
  • CRC cyclic redundancy checking
  • Figure 8 illustrates the structure of a PB according to the first embodiment.
  • the following table illustrates detailed example information of fields of the PB.
  • the GP (801,807) is a time period between every two consecutive active timeslots.
  • the TB fields (802,806) comprise modulating bits as follows:
  • the Info fields (803, 805) comprise 8 bits carrying the control message of the PAN field, cause field and user ID field, and the TSC field (804) comprises modulating bits according to a training sequence code TSC.
  • the TSC is e.g. any of the following sequences BNlIl, BN112, ..., BN136: 0,0,1,0,0,1,0,1,1,1,0,0,0,0,1,0,0,0,1,0,0,1,0,0,1,0,1,1,1,1
  • the PB comprises one 16-bit Info field instead of two 8-bit Info fields and the 16-bit Info field follows the TSC field.
  • the 16 encoded bits can also be provided by convolutional encoder. For example, four parity bits are added according to a cyclic redundancy checking, CRC, code and these 8 bits are input to a rate 1/2 convolutional encoder, providing 16 encoded bits.
  • Figure 9 illustrates the structure of a PB according to the second embodiment.
  • the following table illustrates detailed example information of fields of the PB.
  • the GP (901,906) is a time period between every two consecutive active timeslots.
  • the Info field (904) comprise 16 bits carrying the control message of the PAN field and cause field.
  • the TSC field (903) comprises modulating bits according to a training sequence code TSC indicating a user.
  • the TSC is e.g. any of the following sequences BN103, BN104, ..., BN128: 0,0,1,0,0,1,0,1,0,1,1,1,0,0,0,1,0,0,1,0,0,1,0,0,1,0,1,0,1,1,1,1 0,0,1,0,1,1,0,1,1,1,1,0,0,0,1,0,1,1,1,10,0,0,1,0,1,1,1,0,1,0,1,0,0,0,0,0,1,1,1,0 0,1,0,0,0,0,0,1,1,1,0,0,1,0,0,0,0,1,1,1,1,0,1,0,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,0,1,
  • the 16 Info bits are divided into two parts, each of which comprises 8 bits, providing the structure of the PB illustrated in figure 8.
  • the control message is carried in an AB.
  • the control message comprises an ACK/NACK message for one or more received data blocks, a voice activity message and a user ID message.
  • the ACK/NACK message is carried in a PAN field comprising six bits, each bit representing ACK/NACK for a data block.
  • a voice activity message is carried in a cause field comprising one bit and a user ID message is carried in a user ID field comprising one bit.
  • each AB carries eight message bits. These nine message bits are encoded to form an AB corresponding to encoding as follows.
  • the AB supports a greater number of simultaneous users than the PB, while still providing a sufficiently small latency.
  • Four tail bits are preferably added, providing a sequence of length 18.
  • the 18 bits are encoded for forward error control in a rate 1/2 convolutional encoder providing 36 bits plus possible additional tail bits TB, providing a well defined encoder/decoder state, well known as such.
  • Figure 10 illustrates the structure of an AB according to the embodiment.
  • the following table illustrates the detailed information of the fields of the AB.
  • the TB field (1001) comprises modulating bits BNO, BNl, BN2, BN3, BN4, BN5, BN6, BN7 equal to 0, 0, 1, 1, 1, 0, 1, 0.
  • the Info field (1003) comprises 36 bits carrying the control message of the PAN field, cause field and user ID field, and the TB field (1004) comprises modulating bits with the state of BN85, BN86, BN87 equal to 0, 0, 0.
  • Figure 11 illustrates a UE for sending a control message to a communications network according to an embodiment of the invention.
  • the UE comprises a data structure generating unit (1101) and data structure sending unit (1102).
  • the data structure generating unit (1101) is configured to generate a predefined data structure for carrying a control message.
  • the data structure sending unit (1102) is configured to send the predefined data structure carrying the control message in particular bit interval allocation of a PTCCH/U or an idle frame.
  • the data structure generated by the data structure generating unit (1101) comprises at least one of an ACK/NACK message for one or more received data blocks, a voice activity message and a user ID message, where preferably the ACK/NACK message is carried in a PAN field, the voice activity message is carried in a cause field and the user ID message is carried in a user ID field or a TSC.
  • the functions of the units of the UE are implemented in hardware comprising electrical circuitry or a microprocessor, or software including computer-executable program code or instructions.
  • FIG. 12 illustrates a BSS for receiving a control message form a UE according to an embodiment of the invention.
  • the BSS comprises a receiving unit (1201) and a transmitting unit (1202).
  • the receiving unit (1201) is configured to receive a predefined data structure sent from a UE.
  • the predefined data structure is arranged for carrying a control message comprising at least one of an ACK/NACK message for one or more data blocks, a voice activity message and a user ID message.
  • the BSS further preferably comprises a transmitting unit (1202), which is configured to retransmit one or more data blocks when the ACK/NACK message represents the one or more data blocks are received incorrectly by the UE.
  • the BSS advantageously further comprise a resource allocating unit (1203).
  • the resource allocating unit (1203) is configured to allocate uplink resources for the UE when the voice activity message represents a positive voice activity.
  • the BSS optionally also comprises a user ID allocating unit (1204), which is configured to allocate a user ID for each of the users sharing an uplink channel.
  • a user ID allocating unit (1204) which is configured to allocate a user ID for each of the users sharing an uplink channel.
  • the functions of the units of the BSS are implemented by hardware comprising electrical circuitry or a microprocessor, or by software including computer-executable program code or instructions.

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

Abstract

La présente invention concerne un service de conversation sur un réseau à commutation de paquets (PS), en particulier sur une technologie pour envoyer et recevoir un message de commande dans un réseau PS. Selon les modes de réalisation de l'invention, une structure de données transportant un message de commande est envoyée pour envoyer un message de commande à un réseau de communications dans une attribution d'intervalle de bits particulière d'un canal de commande d'avance temporelle de paquet pour la liaison montante (PTCCH/U) ou une trame inactive et un sous-système de station de base (BSS) est utilisé pour recevoir un message de commande provenant d'un équipement utilisateur (UE). Des modes de réalisation de l'invention portent également sur une structure de données pour transporter un message de commande.
PCT/CN2009/070347 2008-10-17 2009-02-03 Procédé et appareil de télécommunications WO2010043120A1 (fr)

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