WO2010139155A1 - Procédé de structure et de configuration de trame et procédé de communication associé - Google Patents

Procédé de structure et de configuration de trame et procédé de communication associé Download PDF

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Publication number
WO2010139155A1
WO2010139155A1 PCT/CN2009/074864 CN2009074864W WO2010139155A1 WO 2010139155 A1 WO2010139155 A1 WO 2010139155A1 CN 2009074864 W CN2009074864 W CN 2009074864W WO 2010139155 A1 WO2010139155 A1 WO 2010139155A1
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Prior art keywords
subframe
type
frame structure
ofdm symbols
frame
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PCT/CN2009/074864
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English (en)
Chinese (zh)
Inventor
关艳峰
方惠英
孙长印
刘颖
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中兴通讯股份有限公司
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Priority to KR1020117028839A priority Critical patent/KR101312089B1/ko
Publication of WO2010139155A1 publication Critical patent/WO2010139155A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • 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

Definitions

  • the present invention relates to the field of communications, and in particular, to a frame structure, a configuration method thereof, and a communication method. Background technique
  • Orthogonal Frequency Division Multiplexing (OFDM) technology is a high-speed transmission technology in a wireless environment that improves the performance against multipath fading by extending the pulse width of the symbol.
  • the implementation principle of OFDM technology is: transforming high-speed serial data into multiple relatively low-speed parallel data, and modulating the multiple parallel data onto mutually orthogonal sub-carriers for transmission.
  • the Orthogonal Frequency Division Multiple Access (OFDMA) technology implements multiple access by making users occupy different subcarriers based on OFDM technology.
  • a duplex mode supported by a base station includes a frequency division duplex (FDD) mode and a time division duplex (TDDD) mode, which respectively correspond to an FDD frame structure and a TDD frame. structure.
  • FDD frequency division duplex
  • TDDD time division duplex
  • WiMAX Worldwide Interoperability for Microwave Access
  • the control channel is simple in design and has low requirements for uplink synchronization
  • the FDD system requires different frequency bands for uplink/downlink, and the spectrum needs to be used in pairs, and the load ratio of the uplink/downlink is not convenient.
  • the design of the TDD frame structure has the following characteristics: 1. No paired spectrum is required, and frequency programming is convenient;
  • each frame includes an uplink subframe and a downlink subframe, and the mutual conversion between the uplink subframe and the downlink subframe requires a guard time.
  • the uplink/downlink transition interval is called the Transmit/Receive Transition Gap (TTG), also known as the downlink/uplink transition point.
  • TTG Transmit/Receive Transition Gap
  • RTG receive/transmit transition interval
  • Transmit Transition Gap Transmit Transition Gap
  • TDD frame structures of different TDD systems coexist, different TDD systems are basically aligned at the same conversion point. Specifically, when different TDD systems are deployed at the same time, that is, when the coverage overlaps and the same frequency or adjacent frequency, the time alignment problem of the above two switching points will be involved, if the two switching points of multiple TDD systems cannot be aligned , there will be serious co-channel interference between the systems.
  • Time Division-Synchronized Code Division Multiple Access (TD-SCDMA) System and Institute of Electrical and Electronics Engineers (IEEE, Institute of Electrical and Electronics Engineers) 802.16m System
  • TD-SCDMA Time Division-Synchronized Code Division Multiple Access
  • IEEE Institute of Electrical and Electronics Engineers 802.16m System
  • the same communication system needs to support multiple length cyclic prefix (CP, Cyclic prefix) frame structures.
  • CP cyclic prefix
  • the CP of the standard frame structure of the IEEE 802.16m system is 1/8 OFDM symbols, but the CP is also allowed to be 1/16 OFDM in order to continue to improve the frequency efficiency with a small delay and a small cell radius.
  • the frame structure of the symbol is shown in Figure 1 and Figure 2.
  • the CP of the frame structure of the cell A is 1/8 OFDM symbols
  • the CP of the frame structure of the similar cell B is 1/16 OFDM symbols.
  • the CP is required to be 1/8.
  • the transition points of the OFDM symbol and the frame structure of the CP of 1/16 OFDM symbols are substantially aligned.
  • the IEEE 802.16m system has an OFDM symbol length of 102.857us at 5 MHz, and a CP ratio of 1/8 OFDM when the ratio of the downlink subframe to the uplink subframe is 5:3.
  • the TTG is 2.983 ⁇ 3.086ms
  • the TTG of the CP is 1/16 OFDM is 3.011-3.109ms. Therefore, the downlink does not interfere with the uplink.
  • the communication system In addition to the frame structure in which the CP is 1/8 OFDM symbols and the CP is 1/16 OFDM symbols, the communication system also needs to support scenarios such as Enhanced Multicast Broadcast Service (EMBS) and Large Radius Cell.
  • EMBS Enhanced Multicast Broadcast Service
  • the CP is a frame structure of 1/4 OFDM symbols.
  • Fig. 3 shows a frame structure in which CP is 1/4 OFDM symbol.
  • the design in Figure 3 cannot satisfy the alignment problem of TTG when the frame structures with different CPs coexist, and the up/down interference. Therefore, a new frame structure of CPs of 1/4 OFDM symbols is needed. Summary of the invention
  • the present invention has been made in view of the fact that the current CP structure of 1/4 OFDM symbols cannot achieve alignment with other frame structures having different CPs. To this end, the present invention aims to provide a new frame structure of CPs of 1/4 OFDM symbols and its configuration scheme to solve the above problems.
  • a frame structure configuration method wherein a cyclic prefix of a frame structure is 1/4 OFDM symbols.
  • the method includes: determining, among the seven subframes constituting the frame structure, the number of each of the first type of subframe, the second type of subframe, and the third type of subframe is A, B, and C; wherein, A, B, and C are three The sum is 7, the first type of subframe contains 6 OFDM symbols, the second type of subframe contains 7 OFDM symbols, and the third type of subframe contains 5 OFDM symbols.
  • the frame structure is a TDD frame structure, and one of the following sets is selected as ⁇ A, B, C ⁇ : ⁇ 5, 1 , 1 ⁇ , ⁇ 3 , 2, 2 ⁇ .
  • the frame structure is an FDD frame structure, and one of the following sets is selected as ⁇ A, B, C ⁇ : ⁇ 4, 2, 1 ⁇ , ⁇ 2, 3, 2 ⁇ .
  • the method further includes: configuring the first downlink subframe of the frame structure as the first type of subframe; and/or configuring the first uplink subframe of the frame structure as the first type of subframe or the second type Subframe.
  • the cyclic prefix of the frame structure being 1/4 OFDM symbols.
  • the numbers A, B, and C of the first type of subframe, the second type of subframe, and the third type of subframe are respectively determined; wherein, A, B, and C are three
  • the sum is 6, the first type of subframe contains 6 OFDM symbols, the second type of subframe contains 7 OFDM symbols, and the third type of subframe contains 8 OFDM symbols.
  • the frame structure is a TDD frame structure, and one of the following sets is selected as ⁇ A, B, C ⁇ : ⁇ 1, 4, 1 ⁇ , ⁇ 0, 6, 0 ⁇ .
  • the above frame structure is an FDD frame structure, and one of the following sets is selected as ⁇ A, B, C ⁇ : ⁇ 1, 3, 2 ⁇ , ⁇ 0, 5, 1 ⁇ .
  • the method further includes: configuring the first downlink subframe of the frame structure as the first type of subframe; and/or configuring the first uplink subframe of the frame structure as the first type of subframe or the second type Subframe.
  • a configuration method for a plurality of frame structures for configuring when a plurality of frame structures of different cyclic prefixes coexist.
  • the RTG of the first frame structure is adjusted, and/or the symbols in the uplink subframe or the downlink subframe in the first frame structure are deleted, so that the starting position of the uplink subframe of the first frame structure is located in the second frame.
  • the end position of the downlink subframe of the frame structure wherein one of the first frame structure and the second frame structure is composed of 7 or 6 subframes, and the cyclic prefix is 1/4 OFDM symbol.
  • the RTG of the first frame structure is adjusted by: transmitting an offset or a starting position of the uplink subframe on the broadcast channel; and/or transmitting an offset or starting position of the RTG and/or TTG on the broadcast channel .
  • the first frame structure and the second frame structure are TDD frame structures
  • the 7 subframes include: a first type of subframe, including 6 OFDM symbols; a second type of subframe, including 7 OFDM symbols;
  • the frame includes 5 OFDM symbols, and the number of each of the first type of subframe, the second type of subframe, and the third type of subframe is A, B, and C, and one of the following sets is selected as ⁇ A, B, C ⁇ : ⁇ 5, 1 , 1 ⁇ , ⁇ 3 , 2, 2 ⁇ .
  • the first frame structure and the second frame structure are FDD frame structures
  • the 7 subframes include: a first type of subframe, including 6 OFDM symbols; a second type of subframe, including 7 OFDM symbols;
  • the frame includes 5 OFDM symbols, and the number of each of the first type of subframe, the second type of subframe, and the third type of subframe is A, B, and C, and one of the following sets is selected as ⁇ A, B, C ⁇ : ⁇ 4, 2, 1 ⁇ , ⁇ 2, 3 , 2 ⁇ .
  • the first frame structure and the second frame structure are TDD frame structures
  • the six subframes include: a first type of subframe, including 6 OFDM symbols; a second type of subframe, including 7 OFDM symbols;
  • the frame includes 8 OFDM symbols, and the number of each of the first type of subframe, the second type of subframe, and the third type of subframe is A, B, and C, and one of the following sets is selected as ⁇ A, B, C ⁇ : ⁇ 1 , 4, 1 ⁇ , ⁇ 0, 6, 0 ⁇ .
  • the first frame structure and the second frame structure are FDD frame structures
  • the six subframes include: a first type of subframe, including 6 OFDM symbols; a second type of subframe, including 7 OFDM symbols;
  • the frame includes 8 OFDM symbols, and the number of each of the first type of subframe, the second type of subframe, and the third type of subframe is A, B, and C, and one of the following sets is selected as ⁇ A, B, C ⁇ : ⁇ 1 , 3 , 2 ⁇ , ⁇ 0, 5, 1 ⁇ .
  • a communication method based on a frame structure in which a cyclic prefix is 1/4 OFDM symbol.
  • the method includes: the first device sends a radio frame to the second device, where the radio frame is composed of 7 subframes, and the number of the first type subframe, the second type subframe, and the third type subframe included in the subframe is respectively Eight, B, C, and the sum of eight, B, and C is 7, wherein the first type of subframe contains 6 OFDM symbols, the second type of subframe contains 7 OFDM symbols, and the third type of subframe contains 5 OFDM symbols.
  • the frame structure is a TDD frame structure, and ⁇ A, B, C ⁇ are selected from the following sets: ⁇ 5, 1 , 1 ⁇ , ⁇ 3 , 2, 2 ⁇ .
  • the frame structure is an FDD frame structure, and ⁇ A, B, C ⁇ are selected from the following sets: ⁇ 4, 2, 1 ⁇ , ⁇ 2, 3, 2 ⁇ .
  • one of the first device and the second device is a base station or a relay station, and the other is a terminal or a relay station.
  • a communication method based on a frame structure in which a cyclic prefix is 1/4 OFDM symbol.
  • the first device sends a radio frame to the second device, where the radio frame is composed of 6 subframes, and the number of the first type subframe, the second type subframe, and the third type subframe included in the subframe respectively
  • the sum of eight, B, C, and eight, B, and C is 6, wherein the first type of subframe includes 6 OFDM symbols, the second type of subframe includes 7 OFDM symbols, and the third type of subframe includes 8 OFDM symbols.
  • the frame structure is a TDD frame structure, and ⁇ A, B, C ⁇ are selected from the following sets: ⁇ 1, 4, 1 ⁇ , ⁇ 0, 6, 0 ⁇ .
  • the frame structure is an FDD frame structure, and ⁇ A, B, C ⁇ is selected from the following sets: ⁇ 1, 3, 2 ⁇ , ⁇ 0, 5, 1 ⁇ .
  • one of the first device and the second device is a base station or a relay station, and the other is a terminal or a relay station.
  • a frame structure wherein a cyclic prefix is 1/4 OFDM symbols, and 7 subframes constituting a frame structure include a first type of subframe, a second type of subframe, and a third type of subframe.
  • a frame where the first type of subframe includes 6 OFDM symbols, the second type of subframe includes 7 OFDM symbols, and the third type of subframe includes 5 OFDM symbols.
  • the number A, B, and C of the first type of subframe, the second type of subframe, and the third type of subframe satisfy the sum of A, B, and C, and ⁇ A, B, C ⁇ is selected from the group consisting of The following collections: ⁇ 5, 1 , 1 ⁇ , ⁇ 3 , 2, 2 ⁇ , ⁇ 4, 2, 1 ⁇ , ⁇ 2, 3 , 2 ⁇ .
  • a frame structure is provided, the cyclic prefix is 1/4 OFDM symbols, and the six subframes constituting the frame structure include a first type of subframe, a second type of subframe, and a third type of subframe.
  • a frame where the first type of subframe includes 6 OFDM symbols, the second type of subframe includes 7 OFDM symbols, and the third type of subframe includes 8 OFDM symbols.
  • the number of the first type of subframe, the second type of subframe, the third type of subframe A, B, C satisfies the sum of A, B, and C is 6, and ⁇ A, B, C ⁇ is selected from The following collections: ⁇ 1, 4, 1 ⁇ , ⁇ 0, 6, 0 ⁇ , ⁇ 1, 3, 2 ⁇ , ⁇ 0, 5, 1 ⁇ .
  • a new frame structure of a CP of 1/4 OFDM symbols is implemented.
  • the frame structure can be implemented with other frame structures having different CPs. Align so that up/down interference can be avoided.
  • FIG. 1 is a schematic diagram of a frame structure of a wireless communication system according to the related art, wherein CP is 1/8 OFDM symbols;
  • 2 is a schematic diagram of a frame structure of a wireless communication system according to the related art, wherein the CP is 1/16 OFDM symbols;
  • 3 is a schematic diagram of a frame structure of a wireless communication system according to the related art, wherein the CP is 1/4 OFDM symbols;
  • FIG. 4 and FIG. 5 are schematic diagrams showing a frame structure of a wireless communication system according to an embodiment of the present invention, wherein the CP is 1/4 OFDM symbols, and the frame structure includes 7 subframes;
  • FIG. 6 and FIG. 7 are schematic diagrams showing a frame structure of a wireless communication system according to an embodiment of the present invention, wherein the CP is 1/4 OFDM symbols, and the frame structure includes 6 subframes;
  • CP 1/4 OFDM symbols
  • CP is 1/8 OFDM symbols (also referred to as 1/8 CP) or according to an embodiment of the present invention.
  • the CP is a schematic diagram of the up/down alignment of the frame structure of 1/16 OFDM symbols (also referred to as 1/16 CP). detailed description
  • the frame structure divides radio resources into different levels of units in the time domain. For example, it is divided into a super frame, a frame, a subframe, and an OFDMA symbol, also called an OFDM symbol, to provide flexible control and management to meet the quality of service of the wireless communication system (QoS). , Quality of Service ) requirements, especially to meet the system transmission delay requirements.
  • QoS wireless communication system
  • QoS Quality of Service
  • the radio resources are divided into 20 ms superframes in the time domain, and each superframe includes four 5 ms frames, each frame containing 8 frames.
  • Subframes which consist of basic OFDM symbols.
  • the radio resource is divided into 20 ms superframes in the time domain, each superframe includes four 5 ms frames, and each frame includes 8 subframes.
  • the sub-frame is composed of basic OFDM symbols.
  • the system bandwidth of the frame structure may be 5 MHz, 10 MHz, or 20 MHz
  • the radio resource is divided into 20 ms superframes in the time domain, and each superframe includes four 5 ms frames, each of which The frame contains 7 or 6 subframes, the subframe consists of basic OFDM symbols, and the CP is 1/4 OFDM symbols.
  • 4 to FIG. 7 are respectively schematic diagrams showing a frame structure of a CP of 1/4 OFDM symbols according to an embodiment of the present invention, wherein, in the frame structure shown in FIG. 4 and FIG. 5, each frame includes 7 subframes, In the frame structure given in FIGS. 6 and 7, each frame contains 6 subframes. The description is separately made below.
  • ⁇ A, B, C ⁇ may be selected from ⁇ 5, 1 , 1 ⁇ , ⁇ 3, 2, 2 ⁇ ;
  • ⁇ A, B, C ⁇ may be selected from ⁇ 4 , 2, 1 ⁇ , ⁇ 2, 3, 2 ⁇ .
  • each frame in the TDD frame structure includes five first type subframes, one second type subframe, and one third type subframe; each of the FDD frame structures
  • the frame contains 4 first type subframes, 2 second type subframes, and 1 third type subframe.
  • ⁇ A, B, C ⁇ is ⁇ 5, 1, 1 ⁇ , that is, the number of symbols in 7 subframes. 6, 7, 6, 6, 6, 6, 5;
  • ⁇ A, B, C ⁇ is ⁇ 4, 2, 1 ⁇ , that is, the number of symbols in 7 subframes is 6, 7, 6, 6, 7, 6, 5.
  • each frame in the TDD frame structure includes three first type subframes, two second type subframes, and two third type subframes; each of the FDD frame structures
  • the frame contains 2 first type subframes, 3 second type subframes, and 2 third type subframes.
  • ⁇ A, B, C ⁇ is ⁇ 3, 2, 2 ⁇ , that is, the number of symbols in 7 subframes. 6, 5, 5, 6, 6, 7 , 7; for FDD frame structure, ⁇ A, B, C ⁇ is ⁇ 2, 3, 2 ⁇ , that is, the number of symbols in 7 subframes is 6, 5,
  • ⁇ A, B, C ⁇ can be selected from ⁇ 1, 4, 1 ⁇ , ⁇ 0, 6, 0 ⁇ ;
  • ⁇ A, B, C ⁇ can be selected from ⁇ 1 , 3, 2 ⁇ , ⁇ 0, 5, 1 ⁇ .
  • each frame in the TDD frame structure includes one first type of subframe, four second type of subframes, and one third type of subframe; each of the FDD frame structures
  • the frame includes 1 first type subframe, 3 second type subframes, and 2 third type subframes.
  • ⁇ A, B, C ⁇ is ⁇ 1, 4, 1 ⁇ , that is, the number of symbols in 6 subframes. 6, 7, 7, 7 , 7, 8 respectively;
  • ⁇ A, B, C ⁇ is ⁇ 1, 3, 2 ⁇ , that is, the number of symbols in 7 subframes is 6, 7, respectively.
  • each frame in the TDD frame structure includes 0 first type subframes, 6 second type subframes, and 0 third type subframes; each of the FDD frame structures
  • the frame contains 0 first type subframes, 5 second type subframes, and 1 third type subframe.
  • ⁇ A, B, C ⁇ is ⁇ 0,
  • the first subframe of the downlink is configured as a first type of subframe
  • the first subframe of the uplink is configured as a first type of subframe or the second.
  • Type Subframe Further preferably, the last subframe of the frame structure may be configured as a third type of subframe.
  • the first subframes of the uplink and the downlink are all the first type of subframes.
  • the first subframe of the uplink is the first type.
  • the first subframe of the downlink is a second type of subframe.
  • the embodiment of the present invention further provides a communication method, in which the first device sends a radio frame to the second device, where the radio frame has any according to an embodiment of the present invention.
  • One of the first device and the second device herein may be a base station or a relay station, and the other may be a mobile terminal such as a mobile phone, a personal digital assistant (PDA), or the like.
  • the uplink subframe in the frame structure is used for mobile terminal
  • the downlink subframe in the frame structure is used for downlink transmission of the base station or the relay station to the mobile terminal.
  • the embodiment of the frame structure configuration method and the frame structure thus configured, and the communication method based on the frame structure according to the embodiment of the present invention are given above.
  • switching points or transition interval alignment are involved between different TDD systems or between frame structures of different TDD systems with different CPs.
  • the various frame structures provided by the embodiments of the present invention can implement conversion point or conversion interval alignment as compared with the prior art. The following is described in conjunction with FIG. 8 to FIG. 10 .
  • at least one of the frame structures to be aligned is 1/4 of the CP provided by the embodiment of the present invention.
  • Frame structure of OFDM symbols is 1/4 of the CP provided by the embodiment of the present invention.
  • the transition point or transition interval alignment mentioned in the embodiment of the present invention refers to basic alignment instead of strict alignment.
  • the so-called strict alignment means that the end position of the conversion interval is the same, and the basic alignment means that the end position of the conversion interval does not have to be the same, and only the end position of the downlink subframe of any frame between frames with different cyclic prefixes is required. It does not exceed the start position of the uplink subframe of other frames, or adjust the TTG and/or RTG of the frame structure, or by chiseling or deleting the symbol, so that the end position of the downlink subframe of any frame is not It can exceed the starting position of the uplink subframe of other frames, thereby avoiding co-channel interference.
  • the downlink ends at 1.749 ms.
  • the downlink ends at 1.846 ms.
  • the downlink ends at 2.366 ms.
  • the number of symbols in the uplink 4 subframes is 6, 6, 6, and 7, respectively.
  • the downlink ends at 2.428ms. It can be seen that the start position of the uplink subframe of the 1/8 CP frame structure is earlier than the end position of the downlink subframe of the 1/4 CP frame structure, that is, there is overlap of uplink/downlink. At this point, you need to adjust the frame structure. For example, when the TTG occupies one OFDM symbol, as long as the RTG in the 1/8 CP frame structure is reduced, and the reduced portion is added to the TTG, the frame structure alignment of the three CP lengths can be satisfied.
  • the RTG for adjusting the frame structure, and the method for deleting one or more OFDM symbols in the uplink subframe or the downlink subframe in the frame structure may be used separately or In conjunction with.
  • the RTG or OFDM symbol can be implemented by transmitting an offset or a starting position of the uplink subframe on the broadcast channel, and/or transmitting an offset or a starting position of the RTG and/or TTG on the broadcast channel. Adjustment.
  • the amount of offset referred to herein refers to the offset from the original frame structure before unadjustment.
  • the frame structure and the frame structure alignment method provided by the present invention solve the problem of alignment of uplink/downlink subframes in frame structures of different CP lengths.

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

Abstract

La présente invention se rapporte à un procédé de structure et de configuration de trame et à un procédé de communication associé. On implémente une nouvelle structure de trame selon laquelle le préfixe cyclique (CP) fait 1/4 du symbole OFDM. Par comparaison avec l'état de la technique, la structure de trame peut implémenter l'alignement avec une autre structure de trame ayant un préfixe CP différent ce qui permet d'éviter l'interférence en liaison montante/liaison descendante.
PCT/CN2009/074864 2009-06-01 2009-11-09 Procédé de structure et de configuration de trame et procédé de communication associé WO2010139155A1 (fr)

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CN101208887A (zh) * 2005-03-30 2008-06-25 北电网络有限公司 正交频分多路复用符号的传输方法和系统
CN1992691A (zh) * 2005-12-27 2007-07-04 中兴通讯股份有限公司 一种基于ofdm技术的信道同步方法
CN101184076A (zh) * 2007-12-18 2008-05-21 中兴通讯股份有限公司 一种移动宽带系统中多播单频网子帧结构及其发送方法

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