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WO2003105395A1 - Procede de transmission de donnees pour un trafic de paquets a haute vitesse base sur la fonction tdd - Google Patents

Procede de transmission de donnees pour un trafic de paquets a haute vitesse base sur la fonction tdd Download PDF

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Publication number
WO2003105395A1
WO2003105395A1 PCT/CN2003/000084 CN0300084W WO03105395A1 WO 2003105395 A1 WO2003105395 A1 WO 2003105395A1 CN 0300084 W CN0300084 W CN 0300084W WO 03105395 A1 WO03105395 A1 WO 03105395A1
Authority
WO
WIPO (PCT)
Prior art keywords
time slot
uplink
data
time
downlink
Prior art date
Application number
PCT/CN2003/000084
Other languages
English (en)
Chinese (zh)
Inventor
Lei Zhou
Zhibin Zheng
Yuehua Chen
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 AU2003273892A priority Critical patent/AU2003273892A1/en
Publication of WO2003105395A1 publication Critical patent/WO2003105395A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1438—Negotiation of transmission parameters prior to communication
    • H04L5/1453—Negotiation of transmission parameters prior to communication of modulation type
    • 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

Definitions

  • the invention relates to a packet data service transmission method in a wireless communication system using a time division duplex (TDD) standard.
  • TDD time division duplex
  • TD-SCDMA time division synchronous code division multiple access
  • data transmission is usually performed by the following method: When using a 96-chip downlink pilot Slot (DwPTS) to achieve downlink reception synchronization; Upstream pilot time slot (UpPTS) added to 96 chip protection period (GP) to achieve uplink reception synchronization; and finally provide data transmission for different users through service time slots of the same length service.
  • DwPTS downlink pilot Slot
  • UpPTS Upstream pilot time slot
  • GP 96 chip protection period
  • FIG. 2 illustrates a subframe structure in TD-SCDMA with a fixed time length of 5 ms and containing 6400 chips.
  • the remaining 7 service time slots include two uplink time slots TS1, TS2, and five downlink time slots TS0, TS3. , TS4, TS5, TS6, all of which are 0.675 ms long.
  • the first time slot (TS0) is always allocated for downlink
  • the second time slot (TS1) is always allocated for uplink.
  • TD-SCDMA also has a second, unfixed uplink-downlink switch point, in order to achieve flexible uplink-downlink ratio settings and support symmetrical and asymmetric uplink and downlink services.
  • the second uplink-downlink switching point is set between the third time slot (TS 2 ) and the fourth time slot (TS 3 ), so it can support the asymmetry of the uplink and downlink ratio of 2: 5.
  • TD-SCDMA code division multiple access
  • multiple users are supported in each time slot to use a code division multiple access (CDMA) method for parallel data transmission and reception.
  • CDMA code division multiple access
  • FIG. 3 for the structure of each time slot in the frame shown in FIG. 2, it can be known from FIG. 3 that each time slot contains an intermediate pilot with a length of 144 chips. Because each time slot is an independent structure, and each time slot is provided with a separate pilot, different user signals can be used in addition to multiplexing channels in the same time slot with different spreading codes, and can also be allocated.
  • Time division multiplexing is performed in different time slots, thereby avoiding mutual interference as much as possible, and improving the quality of user communication. Therefore, the existing TD-SCDMA communication method is a better communication method for low-rate voice services, which is beneficial to the realization of multiple users receiving voice service data in parallel through the CDMA method.
  • the TDD method is used to support asymmetric services without causing waste of spectrum. Therefore, the TDD method is more suitable for supporting high-speed packet data services.
  • the existing data transmission method based on the TD-SCDMA subframe structure is not conducive to the transmission of high-speed packet service data.
  • FIG. 4 the timing relationship of high-speed data transmission is shown in FIG. 4. In FIG. 4, after the channel quality is reported, 2.7 ms is reserved for base station (Node-B) scheduling, and 5 ms processing time is reserved after receiving high-speed service data.
  • the quality measurement reported by the user in subframe n is actually performed in subframe n-1, and the actual transmission of high-speed data can only be performed in subframe n + 1.
  • the delay is longer than one subframe, that is, 5 ms. Under other timing arrangements, the delay between the two may be longer. Because the wireless fading channel changes rapidly, the increase in delay means that the difference between the two channels also becomes larger, resulting in a reduction in the transmission efficiency and spectrum utilization of high-speed packet data services.
  • An object of the present invention is to provide a method for transmitting high-speed packet service data based on time division labor, and the method has high transmission efficiency and spectrum utilization rate of high-speed packet service data.
  • a method for transmitting high-speed packet service data based on time division duplex includes:
  • the user equipment performs downlink channel measurement
  • the user equipment reports to the base station the data request (DRC, DATA) of the modulation and coding method used to send the data determined according to the above measurement results.
  • DRC data request
  • DATA data request
  • d. Arrange separate uplink and downlink synchronization time slots after the uplink service time slot of the current frame; e. arrange the downlink time slots after the uplink and downlink synchronization time slot of the current frame, notify the user to prepare to receive, and perform subsequent downlink services. Downlink service data transmission is performed in time slots.
  • the step c further includes:
  • the user equipment When the user equipment receives the uplink transmission service permitted by the base station, it uses the coding method data request signaling (DRC) reported in the previous time frame to modulate and encode the uplink high-speed packet service data. At the same time, the base station receives the data in the previous time frame.
  • the coding mode data request signaling (DRC) reported by the received UE receives and processes user data.
  • the base station When the base station receives the uplink service data of the UE, the base station simultaneously schedules high-speed data uplink and downlink transmission according to the coding method data request signaling (DRC) reported by multiple UEs.
  • DRC coding method data request signaling
  • the base station After receiving the uplink service and the first time slot after the uplink and downlink synchronization time slot period, the base station notifies the user equipment of the reception parameters including the hybrid automatic retransmission request (H-ARQ) information.
  • This slot broadcasts a fast reception indicator (fas t reception indicator), to which user equipment the port is assigned to the subsequent day of the slot.
  • the base station After receiving the uplink service and the service time slot connected after the first time slot after the uplink and downlink synchronization time slot period, the base station transmits a high-speed packet to the UE allocated to the time slot according to the scheduling result of the downlink high-speed data transmission.
  • Business data After receiving the uplink service and the service time slot connected after the first time slot after the uplink and downlink synchronization time slot period, the base station transmits a high-speed packet to the UE allocated to the time slot according to the scheduling result of the downlink high-speed data transmission.
  • the present invention controls the delay between the time of actual channel measurement and the time of transmitting high-speed service data within a time frame, compared with the existing data transmission method mainly based on voice services, the user can optimize the channel measurement The resulting efficiency improves the performance of high-speed data transmission and system spectrum efficiency, and reduces operating costs.
  • FIG. 1 is a flowchart of a method according to the present invention
  • Figure 2 is a frame structure diagram of a TD-SCDMA system
  • FIG. 3 is a structure diagram of a time slot included in the frame structure of FIG. 2;
  • FIG. 4 is a timing chart of the existing high-speed data transmission in the TD-SCDMA system
  • FIG. 5 is a frame structure diagram adopted by the method described in FIG. 1;
  • FIG. 6 is a timing diagram of execution of the method described in FIG. 1;
  • FIG. 7 is a diagram illustrating an example of a frame structure when the method described in FIG. 1 is specifically applied.
  • FIG. 1 is a flowchart of the method according to the present invention.
  • the UE performs downlink channel measurement in step 1. This step may be specifically implemented by performing downlink channel estimation according to a downlink public pilot or a downlink synchronization code sent by the base station. Assuming that the measurement of the downlink channel was performed by the UE in the previous time frame, the UE performs step 2. In the first time slot of the current time frame shown in FIG. 5, that is, the TS0 time slot, the measurement is reported to the base station according to step 1.
  • the data request (DRC, DATA Reques t Channel) signaling used for the modulation and coding of the transmitted data is determined.
  • the base station arranges one or more uplink services in the second time slot and later time slots in the current time frame, that is, in the TS1 time slot and later time slots, according to the proportion of uplink and downlink services supported by the actual needs.
  • Time slot which provides user uplink transmission service data.
  • step 4 After the uplink service time slot of the current frame, arrange separate uplink and downlink synchronization time slots.
  • step 5 is performed. After the uplink and downlink synchronization time slots of the current frame, a downlink time slot is arranged, the user is notified to prepare for reception, and downlink service data transmission is performed in a subsequent downlink service time slot.
  • step 3 when the UE receives the signaling that the base station grants uplink transmission services, it uses the DRC reported in the previous time frame. Signaling modulates and encodes the uplink packet service data, while the base station uses the DRC on the UE received in the previous time frame.
  • the 4G signaling receives and processes user data.
  • the base station receives user uplink service data
  • the base station performs scheduling according to MCs reported by multiple UEs at the same time, including scheduling downlink high-speed data transmission and scheduling uplink high-speed data transmission.
  • the base station After receiving the uplink service and the uplink and downlink synchronization time slot period, in the downlink time slot TS n, the base station notifies the user equipment of the reception parameters including the hybrid automatic retransmission request (H-ARQ) information, and the base station A fast reception indicator (fas t reception indicator) is broadcast in this time slot to notify which user equipment a subsequent time slot of the time slot is allocated to.
  • H-ARQ hybrid automatic retransmission request
  • the base station After receiving the uplink service and processing the uplink and downlink synchronization time slots, the service time slot connected after one time slot, that is, the service time slot TS n + 1 that is connected subsequently, the base station reports the downlink high speed As a result of the scheduling of data transmission, the UE assigned to this time slot transmits high-speed packet service data. Since the downlink service time slot after TS n + 1 has sufficient time to process the reception parameters received in time slot TS n, it is not necessary to pass fast Receive instructions for notification. Finally, after the UE processes the downlink high-speed service data, it reports whether the data has been correctly received in TS0 time slot of the subsequent time frame.
  • FIG. 7 is an example of a frame structure when the method described in FIG. 1 is applied specifically.
  • the time frame uses the 5ms sub-frame configuration of the TD-SCDMA system, and the number of chips is 6,400 chips.
  • the base station continuously transmits a downlink synchronization code in a downlink synchronization slot before the TS2 slot, which is used by the UE to implement downlink synchronization.
  • the cell broadcast is transmitted in the TS2 time slot. After the UE achieves downlink synchronization, it can easily receive the broadcast information in the time slot after the downlink synchronization time slot, thereby obtaining some information about the cell configuration.
  • the uplink service time slot TS1 The length of time can be flexibly configured according to the actual situation. This configuration information is broadcast in time slot TS2, so the UE can find the time slot of TS0 time slot according to the broadcast information.
  • the UE When providing uplink and downlink high-speed packet data services, the UE first performs channel estimation according to the downlink common pilot in FIG. 7 and obtains the modulation and coding methods that should be used when transmitting packet data, and then modifies the aforementioned modulation and coding methods as agreed. The signaling is reported to the base station in the TS0 slot of the next 5ms frame.
  • the base station performs scheduling according to the modulation and coding methods reported by multiple UEs, and completes the scheduling work before the TS2 time slot (the running time of the scheduling work does not exceed the TS1 time slot, the uplink synchronization time slot, the downlink synchronization time slot, and two The total length of the guard period between the synchronization time slots), and then in the TS2 time slot, the base station notifies the corresponding UE of the result of the scheduling execution.
  • the UE allocated to the TS3 time slot completes the demodulation and decoding of the necessary parameters; or the base station uses a downlink fast receiving indication (fas t recep t) in the TS2 time slot.
  • the UE assigned to the TS4 time slot completes the reception of necessary parameters within the TS3 time period, and after obtaining the parameters, it starts to receive downlink high-speed packet data in the TS4 time slot.
  • the base station After receiving the modulation and demodulation method reported by the UE in the TS0 slot, the base station also needs to perform uplink packet service scheduling. This scheduling result is also notified to the UE in the TS2 slot. Since both the base station and the UE already know the modulation and coding method used for high-speed packet data transmission, the signaling that needs to be quickly received by the UE is only the result of the TS 3 and TS1 time slots (assigned to a UE for downlink and Uplink transmission), the remaining parameters have sufficient time to process.
  • the UE uses the modulation and coding method reported in the TS0 slot of the previous 5ms frame to transmit high-speed packet data uplink, and the base station performs the corresponding receiving operation.
  • the UE and the base station After the UE and the base station process the corresponding high-speed packet reception data, they send acknowledgment information at TS0 and TS2, respectively, to notify the base station and the UE whether retransmission is required.

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

Abstract

L'invention concerne un procédé de transmission de données pour un trafic de paquets à grande vitesse basé sur la fonction TDD. Ce procédé consiste à : effectuer, par l'UE, une mesure sur un canal descendant dans le bloc temporel qui précède immédiatement ; dans un premier intervalle de temps dans le bloc temporel actuel, transmettre à une station de base une signalisation de demande de données (DRC) portant sur la modulation et le mode de codage adopté pour la transmission de données sur la base du résultat de la mesure de l'UE ; puis, dans le deuxième intervalle de temps et les intervalles de temps suivants dans le bloc temporel actuel, régler un ou plusieurs intervalles de temps de trafic ascendant conformément à un débit de trafic ascendant et de trafic descendant pris en charge pour une demande actuelle, ce qui permet de fournir des données de trafic de transmission ascendant de l'UE ; suivre ensuite les intervalles de temps du trafic ascendant et régler un intervalle de temps pilote pour synchroniser le trafic ascendant et le trafic descendant ; suivre l'intervalle de temps pilote, demander à l'UE de se tenir prêt à recevoir les données de trafic descendant ; et enfin, dans le ou les intervalles de temps de trafic descendant suivants, assurer à l'utilisateur un service de données de trafic descendant en fonction du résultat prévu basé sur la mesure de canal transmise par l'utilisateur. La solution susmentionnée peut améliorer la qualité de transmission de données à haute vitesse ainsi que le rendement du spectre de fréquence, tout en réduisant le coût de fonctionnement.
PCT/CN2003/000084 2002-06-06 2003-01-27 Procede de transmission de donnees pour un trafic de paquets a haute vitesse base sur la fonction tdd WO2003105395A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003273892A AU2003273892A1 (en) 2002-06-06 2003-01-27 A data trasmission method for high-speed packet traffic based on the tdd

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN02120975.8 2002-06-06
CN 02120975 CN1274098C (zh) 2002-06-06 2002-06-06 基于时分双工的高速分组业务数据的传输方法

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CN104486013A (zh) * 2014-12-19 2015-04-01 宇龙计算机通信科技(深圳)有限公司 信道检测方法、信道检测系统、终端和基站
CN105636233A (zh) * 2015-12-11 2016-06-01 山东闻远通信技术有限公司 一种laa系统中同时考虑上下行链路的lbt机制

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WO2006022424A1 (fr) * 2004-08-27 2006-03-02 Matsushita Electric Industrial Co., Ltd. Dispositif de mise au point de programme d'emission
CN1855767B (zh) * 2005-04-18 2010-10-06 大唐移动通信设备有限公司 在时分同步码分多址通信系统中建立大半径小区的方法
CN1889759B (zh) * 2005-06-27 2010-05-05 上海原动力通信科技有限公司 高速下行分组中支持多频点数据接收的方法
CN100555930C (zh) * 2005-07-04 2009-10-28 上海原动力通信科技有限公司 多载波hsdpa的信道建立方法和多载波下行分组数据传输方法
CN1909533B (zh) * 2005-08-05 2010-10-06 中兴通讯股份有限公司 时分双工模式下基于正交频分复用技术的帧的生成方法
CN1941669B (zh) * 2005-09-29 2012-07-25 上海原动力通信科技有限公司 一种下行公共导频的插入方法
CN101026429B (zh) * 2006-02-17 2010-11-10 华为技术有限公司 为多载波用户设备分配高速下行共享信道的方法
WO2008006246A1 (fr) * 2006-07-06 2008-01-17 Daoben Li Procédé et système de multiplexage temporel
CN101507323B (zh) * 2006-08-11 2010-11-17 Ut斯达康通讯有限公司 TDD HSDPA系统中Node B获得信道质量信息的方法
CN101137135B (zh) * 2006-09-01 2011-06-29 电信科学技术研究院 一种基站及其发送控制调度信息的方法
CN101212243B (zh) * 2006-12-30 2011-08-24 中兴通讯股份有限公司 一种时分双工反馈增强系统中实现上行功控的方法及系统
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CN101374011B (zh) * 2007-08-20 2012-11-28 中兴通讯股份有限公司 实现两种不同通信系统间临频共存的方法及物理层帧结构
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CN105636233B (zh) * 2015-12-11 2018-11-02 山东闻远通信技术有限公司 一种laa系统中同时考虑上下行链路的lbt方法

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