WO2011088784A1 - Procédé adapté pour obtenir la bande passante d'une station de base, et procédé, dispositif et système adaptés pour transmettre une séquence de préambule - Google Patents

Procédé adapté pour obtenir la bande passante d'une station de base, et procédé, dispositif et système adaptés pour transmettre une séquence de préambule Download PDF

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Publication number
WO2011088784A1
WO2011088784A1 PCT/CN2011/070376 CN2011070376W WO2011088784A1 WO 2011088784 A1 WO2011088784 A1 WO 2011088784A1 CN 2011070376 W CN2011070376 W CN 2011070376W WO 2011088784 A1 WO2011088784 A1 WO 2011088784A1
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WIPO (PCT)
Prior art keywords
base station
bandwidth
preamble sequence
preamble
terminal
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PCT/CN2011/070376
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English (en)
Chinese (zh)
Inventor
杨利英
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华为技术有限公司
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Publication of WO2011088784A1 publication Critical patent/WO2011088784A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method for acquiring a bandwidth of a base station, a method, apparatus, and system for transmitting a preamble sequence. Background technique
  • WiMAX Worldwide Interoperability for Microwave Access
  • IEEE Broadband Wireless Access Metropolitan Area Network
  • a terminal wants to access a base station cell, it needs to establish downlink synchronization with the base station first.
  • establishing downlink synchronization between the terminal and the base station is implemented based on a preamble of the synchronous base station that is sent and received in the working spectrum.
  • the preamble is located in the first symbol of the downlink subframe of the base station.
  • the base station of different bandwidths adopts preambles with different numbers of points to be modulated.
  • the length of the preamble sequence is 567 when the bandwidth is 20M
  • the length of the preamble sequence is 283 when the bandwidth is 10M
  • the length of the preamble sequence is 144 when the bandwidth is 5M
  • the preamble sequence is 1M bandwidth.
  • the length is 36 and so on. According to the agreement, the terminal needs to know the bandwidth of the base station in advance, and the synchronization with the base station can be realized by using the received preamble within the working band bandwidth of the base station.
  • the terminal pre-determines the bandwidth of the base station, such as: 20M, 10M, 5M, etc., and synchronizes according to the assumed bandwidth value in the bandwidth of a certain frequency band by using the preamble delivered by the received base station.
  • the implementation process of using the preamble for synchronization in different bandwidth situations is different for the terminal, because the synchronization algorithm used for synchronizing with the preamble is corresponding to different base station bandwidths.
  • the terminal needs to select a corresponding synchronization algorithm according to the assumed base station bandwidth value until the synchronization is finally implemented according to the synchronization algorithm.
  • the general synchronization algorithm utilizes the time domain correlation implementation, and needs to perform the FFT (Fast Fourier Transform) operation on the received signal, and then multiply the frequency domain data of each preamble sequence stored locally to obtain the correlation value.
  • FFT Fast Fourier Transform
  • embodiments of the present invention provide a method for acquiring a bandwidth of a base station, a method, apparatus, and system for transmitting a preamble sequence.
  • An embodiment of the present invention provides a method for acquiring a bandwidth of a base station, where the method includes:
  • the embodiment of the present invention provides a method for sending a preamble sequence, where the method includes: generating, according to a correspondence between a bandwidth of a base station and a preamble sequence, a preamble sequence corresponding to the base station; and transmitting the preamble sequence to a corresponding receiving terminal And obtaining, by the terminal, the bandwidth of the base station according to the correspondence.
  • the embodiment of the present invention provides a base station, where the base station includes:
  • a preamble sequence generating module configured to generate a preamble sequence corresponding to the bandwidth of the base station according to a correspondence between a bandwidth of the base station and a preamble sequence
  • a preamble sequence sending module configured to send the preamble sequence to a corresponding receiving terminal, where the terminal obtains the base station bandwidth according to the correspondence.
  • the embodiment of the present invention provides a terminal, where the terminal includes:
  • a receiving module configured to receive a preamble sequence sent by the base station, where the preamble sequence corresponds to the base station bandwidth
  • a parsing module configured to parse the preamble sequence, and obtain a correspondence relationship between the preamble sequence and a base station bandwidth
  • the base station bandwidth acquisition module is configured to obtain the bandwidth of the base station according to the correspondence between the preamble sequence and the bandwidth of the base station.
  • the embodiment of the present invention further provides a system for acquiring a bandwidth of a base station, where the system includes the foregoing base station and a terminal.
  • the technical solution provided by the present invention has the following advantages and features: By setting a preset rule, the preamble sequence sent by the base station is set for the bandwidth of the base station, so that after the terminal receives the preamble sequence, according to the The corresponding relationship between the preamble sequence and the bandwidth of the base station directly obtains the bandwidth of the base station.
  • the terminal does not need to configure the bandwidth of the base station in advance, and can avoid the process of assuming the base station bandwidth value for the terminal to obtain the base station bandwidth value, and avoiding the terminal obtaining
  • the synchronization algorithm performed by the base station bandwidth value makes the terminal obtain a simple and convenient bandwidth of the base station, thereby facilitating the free handover of the terminal between different bandwidth base stations and establishing downlink synchronization with the base station.
  • FIG. 1 is a schematic diagram of a preamble subcarrier set 0 of a segmentO in a bandwidth of 20 M in the prior art
  • FIG. 2 is a schematic diagram of a subcarrier occupied by a preamble delivered by a base station of different bandwidths in the prior art
  • FIG. 3 is a flowchart of a method for acquiring a bandwidth of a base station according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a subcarrier occupied by a preamble delivered by a base station of different bandwidths according to an embodiment of the present disclosure
  • FIG. 5 is a schematic diagram of correspondence between each preamble and a base station according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a terminal according to an embodiment of the present invention. detailed description
  • the MS wants to access the base station cell, it first needs to know the bandwidth of the working band of the base station. If the terminal has accessed the base station cell network last time, it will start searching from the last frequency point and within a certain working band bandwidth. First, measure whether there is a signal at the frequency, that is, the required RSSI (Received Signal Strength Indicator). If the RSSI is present and the RSSI exceeds a certain threshold, it indicates that there is a possibility that the Wimax signal exists at the frequency; if not, the next frequency is scanned at a certain interval.
  • RSSI Receiveived Signal Strength Indicator
  • the terminal When a signal exists at a certain frequency point, the terminal will perform downlink synchronization with the base station by using the Preamble delivered by the base station.
  • the Preamble is located in the first symbol of the downlink subframe of the base station, and is broadcast by the symbol. In the existing Wimax system, there are 144 equal-sized preambles for each type of bandwidth.
  • the terminal detects the Preamble, it obtains the Sector ID (Sector Identification Code) and the Cell ID (Cell ID) of the base station. Frame synchronization is reached.
  • Sector ID System Identification Code
  • Cell ID Cell ID
  • the terminal After the frame synchronization is reached, the terminal continues to detect information such as Subcarrier (subcarrier) and MAP (map) used by the sector, and resolves the downlink synchronization with the base station by parsing the DL MAP and UL MAP information.
  • Subcarrier subcarrier
  • MAP map
  • Preamble subcarrier sets there are a total of three types of Preamble subcarrier sets in the downlink of the base station, each of which is defined according to the allocation of different subcarriers. These subcarriers are used for enhanced BPSK modulation of a specific PN (Psudo-Noise) code.
  • PN Psudo-Noise
  • the three sets of leading subcarriers are defined by:
  • PreambleCarrierSet n represents all subcarriers allocated to a specific preamble; n is an index indicating a set of preamble subcarriers, where n is 0, 1, 2;
  • k represents a continuous index. Since the number of subcarriers that can be used in different bandwidths is different, k has different values for different bandwidths, such as: 20M bandwidth, k is 0 to 567; 10M bandwidth, k is taken The value is 0 ⁇ 283; when the bandwidth is 5M, the value of k is 0 ⁇ 141.
  • the cell ID of the preamble is used to identify the identity of the cell in which it resides.
  • Each existing cell has 3 sectors, so the segment number needs to be used to identify the sector location.
  • Each segment applies one of three reamble subcarrier sets: segmentO application preamble subcarrier set 0, segment 1 applies reamble subcarrier set 1, segment2 applies reamble subcarrier set 2. Referring to FIG. 1, the description shows the leading subcarrier set 0 of segmentO when the bandwidth is 20M.
  • FIG. 2 is a schematic diagram showing the number of subcarriers occupied by preambles transmitted by each base station when the bandwidth of the base station is different.
  • the DC (Direct Current) subcarrier signal is not modulated, and the appropriate PN (Psudo) Noise, pseudorandom noise) is rejected, so the DC subcarrier signal is always set to zero.
  • PN Psudo Noise, pseudorandom noise
  • Subcarriers, these guard subcarriers form a guard subcarrier band.
  • the number of preamble subcarriers occupied by the preamble subcarriers is different, and the length of the preamble sequence is different. Therefore, the number of FFT points is different, and the amount of buffered data is different. Therefore, when the terminal cannot know the base station to be accessed in advance, When the bandwidth information is used, it will cause a large amount of synchronization calculation.
  • Embodiments of the present invention provide a method for acquiring bandwidth of a base station, and FIG. 3 shows a flow chart of steps of the method, where the method includes:
  • Step 301 Receive a preamble sent by a base station, where the preamble corresponds to a bandwidth of the base station;
  • Step 302 Parse the preamble sequence to obtain a correspondence between the preamble sequence and the base station bandwidth.
  • Step 303 Acquire the base station bandwidth according to the correspondence between the preamble and the base station bandwidth.
  • the preamble in the embodiment of the present invention is set according to a preset rule, and is sent by the base station in a broadcast manner, and the terminal in the base station cell receives the preamble, and can be according to the agreement between the base stations and the base station.
  • the corresponding relationship between the preamble and the bandwidth of the base station directly acquires the bandwidth of the base station, which can simplify the process of the terminal parsing the preamble to obtain the bandwidth of the base station, so that the terminal establishes downlink synchronization with the base station.
  • the correspondence between the preamble and the bandwidth of the base station that sends the preamble may include the following two methods: In one mode, the base station of different bandwidths still uses the different number of subcarriers in the prior art to send the preamble. That is, the length of the preamble is different for the base stations of different bandwidths. The other method is that the base stations of different bandwidths use the same number of subcarriers to transmit the preamble, that is, the base stations corresponding to different bandwidths, and the length of the preamble is the same.
  • a unified preamble construction manner is established between the base stations of different bandwidths, which will correspond to
  • the base station preambles of different bandwidths are set to be equal in length, and occupy the preamble in a specific window in a specific window of the corresponding base station bandwidth, and the center of the base station bandwidth falls within the specific window.
  • the center of the specific window may coincide with the bandwidth center position of the base station, and the number of left-to-center subcarriers of the specific window is equal to the number of sub-carriers from the right window to the center of the specific window;
  • the DC subcarrier signal is not modulated. Therefore, the DC subcarrier signal is always set to zero, and the DC subcarrier is not used to carry data. That is, in the embodiment of the present invention, the length of the preamble is the same for the base stations of different bandwidths.
  • the base station transmits the preamble by using subcarriers of equal number of left and right sides of the DC subcarrier (located at the center of the bandwidth of the base station) in the specific window.
  • the terminal receives the preamble sent by the base station, even if the bandwidth of the base station is different, the preamble can be parsed by the same synchronization algorithm, and the corresponding relationship between the preamble sequence and the base station bandwidth is obtained.
  • the bandwidth of the base station can simplify the process of the terminal parsing the preamble to obtain the bandwidth of the different base stations, so that the terminal can automatically obtain the bandwidth information of the base station during the process of synchronizing with the preamble, thereby facilitating the terminal to switch between the base stations of different bandwidths.
  • the terminal uses the same synchronization algorithm, that is, it can synchronize with the preamble delivered by the base station of any bandwidth.
  • the general synchronization algorithm is based on the time domain's cyclic correlation equal to the frequency domain's point multiplication. Therefore, it is necessary to first perform the FFT (Fast Fourier Transform) operation on the received signal, and then the frequency of each preamble sequence stored locally. The domain data is multiplied to obtain a correlation value, and the terminal receiving and transmitting time points are adjusted according to the position of the correlation peak, thereby completing synchronization.
  • FFT Fast Fourier Transform
  • base stations of different bandwidths support 144 kinds of Preambles, wherein the sequence forms of various Preambles depend on the segment used and the specific Cell ID.
  • a preferred technical solution provided by the embodiment of the present invention is to perform Preamble setting according to the minimum bandwidth of the base station specified by the existing Wimax protocol.
  • the minimum bandwidth supported by the existing base station is 1 M. Therefore, the Preamble delivered by all the base stations can be set according to the Preamble delivered by the base station of the 1 M bandwidth.
  • the base station of the 1M bandwidth supports 144 kinds of Preamble according to the segment and the specific Cell ID, and the length of the Preamble sequence is 36, and the Preamble is transmitted by using the base station working spectrum spectrum with respect to the 108 subcarriers in the middle, and the left side of the spectrum is 10 subcarriers and 9 subcarriers on the right serve as guard subcarrier bands.
  • the Preambles sent by the base stations are all based on the existing 1M bandwidth base stations.
  • the preamble delivered is set.
  • the 144 types of Preambles are supported according to the respective segments and the specific Cell IDs.
  • the length of the Preamble sequence is 36, and in order to avoid interference of other symbols in the downlink subframe of the base station to the Preamble, the base station is preferably used.
  • FIG. 4 is a schematic diagram showing the number of subcarriers occupied by a preamble delivered by a base station of different bandwidths according to an embodiment of the present invention. As shown in FIG. 4, the length of the preamble delivered by each base station is equal, and the preamble occupies the relatively intermediate subcarriers in the working frequency band for transmission. When the terminal moves from one base station to another, the terminal can reduce the difficulty of acquiring the preamble.
  • each preamble has a unique correspondence with the bandwidth of the base station to which the base station belongs, so that the terminal can directly obtain the corresponding relationship according to the corresponding relationship.
  • the bandwidth of the base station does not specifically limit the setting of the preset rule, and may be separately set by a person skilled in the art according to a specific situation, for example, the preamble is identified by using specific identification information, and each preamble has unique identification information. Each identification information corresponds to a unique base station bandwidth.
  • FIG. 5 shows a schematic diagram of the correspondence between the two.
  • FIG. 5 shows four kinds of bandwidths: 1M, 5M, 10M, and 20M, in order to facilitate the distinction between the base stations.
  • the corresponding number can be used as the identification information.
  • 576 kinds of preambles are respectively distinguished by numbers 0 to 575, where &11 1 ⁇ 0 ⁇ 143 corresponds to 20 ⁇ 1 bandwidth, and preamble 144 ⁇ 287 corresponds to 10M bandwidth, preamble 288 ⁇ 431 corresponds to 5 ⁇ 1 bandwidth, and preamble 432 ⁇ 575 corresponds to 1M bandwidth.
  • the bandwidth of the base station can be determined according to the unique correspondence between the preamble and the bandwidth of the base station.
  • the synchronization process in this case is specifically: the terminal correlates the received preamble data of one signal duration with the data of the preamble sequence stored locally corresponding to the bandwidth of the base station, and detects the correlation with a certain preamble sequence.
  • the peak value exceeds the synchronization capture threshold, it is considered that the preamble sequence is detected, the base station bandwidth is determined according to the correspondence between the preamble sequence and the bandwidth, and the terminal receiving and transmitting time points are adjusted according to the position of the correlation peak, thereby completing synchronization with the base station.
  • the process of obtaining the bandwidth of the base station according to the preamble sent by the base station can be greatly simplified, and for the base stations of different bandwidths, the terminal is unified and simple.
  • the synchronization algorithm can parse the content of the preamble. According to the correspondence between the preamble and the base station bandwidth, the bandwidth of the base station can be directly obtained. Therefore, the terminal does not need to configure the bandwidth of the base station in advance, and can avoid the terminal from obtaining the bandwidth value of the base station.
  • An embodiment of the method for obtaining the bandwidth of the base station by using the foregoing terminal, the embodiment of the present invention further provides a base station, and the structure of the base station is shown in FIG.
  • a preamble sequence generating module 601 configured to generate a preamble sequence corresponding to the bandwidth of the base station according to a correspondence between a bandwidth of the base station and a preamble sequence sent by the base station;
  • the preamble sequence sending module 602 is configured to send the preamble sequence to a corresponding receiving terminal, and obtain, by the terminal, the base station bandwidth according to the correspondence.
  • the base station includes a base station of any bandwidth specified by the existing Wimax protocol, and the minimum bandwidth supported by the existing base station is 1 M. Therefore, the Preamble delivered by all the base stations is delivered by the base station of the 1 M bandwidth. Preamble is set up.
  • the base station of the 1M bandwidth supports 144 kinds of Preamble according to the segment and the specific Cell ID, and the length of the Preamble sequence is 36, and the Preamble is transmitted by using the base station working spectrum spectrum with respect to the 108 subcarriers in the middle, and the left side of the spectrum is used.
  • the 10 subcarriers and the right 9 subcarriers serve as guard subcarrier bands.
  • the 144 kinds of Preambles are supported according to the respective segments and the specific Cell IDs, and the length of the Preamble sequence is 36, and the Preamble is sent by using the base station working spectrum spectrum with respect to 108 intermediate carriers.
  • the left and right subcarriers other than the 108 subcarriers in the relative intermediate position in the respective working spectrum spectrum are used as the guard subcarrier bands.
  • a schematic diagram of the number of subcarriers occupied by the preamble delivered by the base station of different bandwidths can be seen in FIG.
  • the preamble occupies the intermediate subcarriers in the working frequency band for transmission, and the length of the preamble delivered by each base station is equal, which can reduce the difficulty for the terminal to parse the preamble.
  • each preamble has a unique correspondence with the bandwidth of the base station to which the base station belongs, so that the terminal can directly obtain the corresponding relationship according to the corresponding relationship.
  • the bandwidth of the base station Therefore, the terminal does not need to configure the bandwidth of the base station in advance, and can avoid the process of assuming the base station bandwidth value performed by the terminal to obtain the base station bandwidth value.
  • the embodiment of the present invention further provides a terminal. Referring to FIG. 7, a schematic structural diagram of the terminal is shown.
  • the terminal 700 specifically includes:
  • the receiving module 701 is configured to receive a preamble sequence sent by the base station, where the preamble sequence corresponds to the bandwidth of the base station;
  • the parsing module 702 is configured to parse the preamble sequence, and obtain a correspondence between the preamble sequence and a base station bandwidth;
  • the base station bandwidth acquisition module 703 is configured to acquire the base station bandwidth according to the correspondence between the preamble sequence and the base station bandwidth.
  • the terminal After receiving the preamble sent by the base station according to the preset rule, the terminal can directly acquire the bandwidth of the base station according to the correspondence between the preamble and the base station bandwidth negotiated with the base station, and can simplify the terminal to parse the preamble to obtain the base station bandwidth.
  • the process is such that the terminal establishes downlink synchronization with the base station.
  • a unified preamble construction mode is established between the base stations of different bandwidths, and the base stations corresponding to different bandwidths are set to equal lengths, and occupy the subcarriers in the middle of the working spectrum of the base station, so even
  • the bandwidth of the base station is different, and the terminal can also parse the received preamble by using the same synchronization algorithm, thereby reducing the difficulty of the terminal to parse the preamble. Therefore, the terminal does not need to configure the bandwidth of the base station in advance, and can avoid the process of assuming the base station bandwidth value performed by the terminal to obtain the base station bandwidth value, thereby facilitating the terminal to establish downlink synchronization with the base station.
  • the synchronization process in this case is specifically: the terminal correlates the received preamble data of one signal duration with the data of the preamble sequence stored locally corresponding to the bandwidth of the base station, and detects the correlation with a certain preamble sequence.
  • the peak value exceeds the synchronization capture threshold, it is considered that the preamble sequence is detected
  • the base station bandwidth is determined according to the correspondence between the preamble sequence and the bandwidth, and the terminal receiving and transmitting time points are adjusted according to the position of the correlation peak, thereby completing synchronization with the base station.
  • the embodiment of the present invention further provides a system for acquiring a bandwidth of a base station, where the system specifically includes: a base station and a terminal;
  • the base station is configured to send a preamble sequence, where the preamble sequence is set according to a preset rule, and corresponds to the bandwidth of the base station;
  • the terminal is configured to receive the preamble sequence, parse the preamble sequence, and obtain a correspondence between the preamble sequence and a base station bandwidth; and acquire the base station bandwidth according to a correspondence between the preamble sequence and a base station bandwidth.
  • the base station includes base stations of different bandwidths, and the base stations of different bandwidths set the preamble sequences to different bandwidths, set to equal lengths, and occupy subcarriers in the middle of the working spectrum of the base station.
  • the minimum bandwidth supported by the existing base station is 1 M. Therefore, the preambles sent by all the base stations are set according to the Preamble delivered by the base station of the 1 M bandwidth, that is, for the base stations of different bandwidths, according to the segment of the respective base station and the specific Cell ID support.
  • the length of the Preamble sequence is 36, and the Preamble is transmitted by using the base station working spectrum spectrum with respect to the 108 subcarriers in the middle, and the left and right subcarriers except the 108 subcarriers in the relative intermediate position in the respective working spectrum spectrum are respectively As a protection subcarrier band.
  • each preamble has a unique correspondence with the bandwidth of the base station to which it belongs, so that the terminal can directly obtain the bandwidth of the base station according to the correspondence. Therefore, the terminal does not need to configure the bandwidth of the base station in advance, and can avoid the process of assuming the base station bandwidth value for the terminal to obtain the base station bandwidth value, thereby facilitating the terminal to establish downlink synchronization with the base station.
  • the foregoing functional modules may be implemented by using software, hardware, or a combination of software and hardware, which is not specifically limited in this embodiment of the present invention.
  • the description is relatively simple, and the relevant parts can be referred to the description of the method embodiment.
  • the device embodiments described above are merely illustrative, wherein the unit described as a separate component may be or may also be
  • the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without any creative effort.

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

Abstract

Dans ses modes de réalisation, la présente invention se rapporte : à un procédé adapté pour obtenir la bande passante d'une station de base ; et à un procédé, à un dispositif et à un système adaptés pour transmettre une séquence de préambule. Le procédé adapté pour obtenir une bande passante d'une station de base selon la présente invention consiste : à recevoir la séquence de préambule distribuée par la station de base, la séquence de préambule correspondant à la bande passante d'une station de base ; à analyser la séquence de préambule de sorte à obtenir la relation correspondante entre la séquence de préambule et la bande passante de la station de base ; à obtenir la bande passante de la station de base en fonction de ladite relation correspondante entre la séquence de préambule et la bande passante de la station de base. La solution technique proposée par les modes de réalisation de la présente invention permet à un terminal d'obtenir sans difficulté la bande passante de la station de base. De cette manière, le processus d'utilisation de la séquence de préambule distribuée par la station de base de sorte est simplifié, ce qui permet au terminal d'établir une synchronisation sur la liaison descendante avec la station de base.
PCT/CN2011/070376 2010-01-20 2011-01-19 Procédé adapté pour obtenir la bande passante d'une station de base, et procédé, dispositif et système adaptés pour transmettre une séquence de préambule WO2011088784A1 (fr)

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CN101777950A (zh) * 2010-01-20 2010-07-14 上海华为技术有限公司 获取基站带宽的方法、发前导序列的方法及装置和系统
CN103313419A (zh) * 2012-03-09 2013-09-18 上海贝尔股份有限公司 一种随机接入方法及装置
CN103888962B (zh) * 2012-12-21 2017-11-17 华为技术有限公司 获取带宽信息的方法和装置
CN104429032A (zh) * 2013-01-28 2015-03-18 华为技术有限公司 信息传输方法、用户设备和基站

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WO2009053943A2 (fr) * 2007-10-24 2009-04-30 Nokia Siemens Networks Oy Procédé et appareil fournissant une structure de trame pour prendre en charge différents modes opérationnels
CN101494637A (zh) * 2008-01-24 2009-07-29 中兴通讯股份有限公司 用于WiMAX演进系统的终端接入方法及帧结构
CN101777950A (zh) * 2010-01-20 2010-07-14 上海华为技术有限公司 获取基站带宽的方法、发前导序列的方法及装置和系统

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WO2009053943A2 (fr) * 2007-10-24 2009-04-30 Nokia Siemens Networks Oy Procédé et appareil fournissant une structure de trame pour prendre en charge différents modes opérationnels
CN101198179A (zh) * 2007-12-21 2008-06-11 中兴通讯股份有限公司 后向兼容802.16e系统的接入方法
CN101494637A (zh) * 2008-01-24 2009-07-29 中兴通讯股份有限公司 用于WiMAX演进系统的终端接入方法及帧结构
CN101777950A (zh) * 2010-01-20 2010-07-14 上海华为技术有限公司 获取基站带宽的方法、发前导序列的方法及装置和系统

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