WO2010069111A1 - 一种实现毫微微小区导频分配的方法、基站及移动终端 - Google Patents

一种实现毫微微小区导频分配的方法、基站及移动终端 Download PDF

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Publication number
WO2010069111A1
WO2010069111A1 PCT/CN2008/073579 CN2008073579W WO2010069111A1 WO 2010069111 A1 WO2010069111 A1 WO 2010069111A1 CN 2008073579 W CN2008073579 W CN 2008073579W WO 2010069111 A1 WO2010069111 A1 WO 2010069111A1
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WIPO (PCT)
Prior art keywords
pilot
pattern
symbol
pilot position
resource block
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PCT/CN2008/073579
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English (en)
French (fr)
Inventor
王文焕
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中兴通讯股份有限公司
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Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to PCT/CN2008/073579 priority Critical patent/WO2010069111A1/zh
Publication of WO2010069111A1 publication Critical patent/WO2010069111A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal

Definitions

  • the present invention relates to the field of mobile communications, and in particular, to a method, a base station, and a mobile terminal for implementing femtocell (FemtoCell) pilot allocation in an orthogonal frequency division multiplexing system.
  • FemtoCell femtocell
  • Orthogonal Frequency Division Multiplexing converts a high-speed transmitted data stream into a set of low-speed parallel-transmitted data streams, so that the system pairs
  • the sensitivity of multipath fading channel frequency selectivity is greatly reduced, and the introduction of cyclic prefix further enhances the system's ability to resist Inter-symbol Interference (ISI).
  • ISI Inter-symbol Interference
  • OFDM Orthogonal Frequency Division Multiplexing
  • a base station is a device that provides services for a terminal, and a base station passes through a downlink.
  • High-speed, high-quality data services are generally affected by the channel environment, which is subject to fading, shadows, Doppler effects caused by user movement, and so on. To effectively overcome these influencing factors and provide high-quality services for wireless systems, it is necessary to estimate and compensate the effective channel.
  • channel estimation methods are divided into two categories. : Pilot-based channel estimation and blind estimation.
  • pilot-based channel estimation algorithm that is, transmitting a pilot subcarrier known to the receiving end at the transmitting end, and the receiving end detects the transmitted signal after transmission to obtain channel information, which can be well tracked. Changes in the channel improve the performance of the receiver.
  • pilot-based channel estimation techniques in addition to the performance of the pilot channel estimation algorithm, the transmitter pilot design directly affects system performance to a large extent.
  • the distribution of the pilot signals should take into account the statistical characteristics of the wireless fading channel, ie the coherence bandwidth and the coherence time.
  • the distribution of the pilot signals should also take into account the different characteristics of the uplink and downlink transmissions of the Orthogonal Frequency Division Multiplexing system. If the pilot signal is a downlink transmission, it includes both a common pilot signal that can be used for all users in the full frequency band, and only a system that transmits the dedicated frequency band allocated to a specific user. A dedicated pilot signal that can be used by a particular user. If the pilot signal is an uplink transmission, it includes a dedicated pilot signal that can only be used by a particular user for transmission on a dedicated frequency band allocated by the system to a particular user.
  • each physical resource block must be capable of independent data demodulation, that is, dedicated on each physical resource block.
  • the pilot signal must be sufficient for independent channel estimation.
  • the minimum interval between two pilot subcarriers is 12 subcarriers.
  • the coherent bandwidth of the wireless fading channel When less than 12 subcarriers, the floor effect cannot be avoided.
  • the downlink subchannel allocation mode is PUSC (partial subchannel application mode)
  • the minimum interval between two pilot subcarriers is also 12 subcarriers, and the ground plane effect is still unavoidable.
  • Orthogonal Frequency Division Multiplexing In the Orthogonal Frequency Division Multiplexing (OFDM) system, resource allocation is allocated in two dimensions. One dimension is the time axis occupied by orthogonal frequency division multiplexing symbols, and the other dimension is the occupied frequency subcarrier allocation occupied by frequency resources.
  • the macro cell corresponding to the mobile terminal moving speed of 120Km/h to 350Km/h (km/h) is in a physical resource block in the description design of the existing IEEE802.16m OFDM system.
  • the vertical direction is in units of time (OFDM symbol) and the horizontal direction is in frequency (subcarrier).
  • For multi-antenna transmission take 2 antennas as an example, including antenna 1 and antenna 2.
  • the diagonally filled squares represent the pilots corresponding to antenna 1, and the vertically filled squares represent the pilots corresponding to antenna 2, as shown in the figure.
  • the pilots of antenna 1 and antenna 2 are adjacent in frequency, and the pilots corresponding to the two antennas may also be adjacent in the time domain (not shown).
  • two macro cells are taken as an example, including macro cell 1 and macro cell 2.
  • the diagonally padded squares represent the pilots corresponding to the macro cell 1, and the vertically filled blocks represent the pilots corresponding to the macro cell 2.
  • the pilots of the macro cell 1 and the macro cell 2 shown in the figure are adjacent in frequency, and the pilots corresponding to the two antennas may also be adjacent in the time domain (not shown in the figure).
  • FemtoCell technology is a solution for extending indoor coverage of mobile communications.
  • IP protocol voice and data calls from user handsets can be transmitted to a core network based on standard interfaces, which can be connected to any existing based IP delivery network.
  • Femtocell base station and operation Other mobile base stations of the service can be used in common with mobile terminals such as the standard system, the same frequency band, and mobile phones.
  • the femtocell base station is small in size, low in power (transmitting power is 10 100 mW), covers a radius of 50 200 meters, supports 4 to 6 active users, and allows a maximum user movement speed of 10 km/h;
  • Residential users with coverage capabilities and SOHO (Small Office Home Office) indoor users are the main service targets.
  • the femto cell pilot design mode has not been defined, and its application scenario is different from that of the macro cell. Since the pilot cost of the macro cell is large, the femto cell base station is considered to be small in size, low in power, small in number of serving users, and mobile. The low speed and the like, the possibility of directly applying the pilot design of the macro cell to the femto cell is small, so it is necessary to design the pilot of the femto cell.
  • the technical problem to be solved by the present invention is to provide a method, a base station and a mobile terminal for implementing pilot allocation of a femto cell, which reduces the overhead of transmitting a pilot signal and improves system performance.
  • the present invention provides a method for implementing pilot allocation of a femto cell, including: a femto cell base station determining a number and a position of a femto cell pilot in a physical resource block, that is, determining a pilot position
  • the femtocell base station or the femtocell mobile terminal transmits a pilot signal at a pilot position indicated by the pilot location pattern, where the pilot location is a location of a pilot of a macrocell pilot in a physical resource block.
  • the pilot location is a location of a pilot of a macrocell pilot in a physical resource block.
  • the position of the pilot in the pilot position pattern is one or more of the following positions: symbol 0 subcarrier 8, symbol 1 subcarrier 16, symbol 2 subcarrier 0, symbol 3 subcarrier 8, symbol 4 subcarrier 16, symbol 5 subcarrier 0.
  • the pilot position pattern is a pilot position corresponding to the physical resource block whose number of symbols is 6 and the number of subcarriers is 18.
  • a pilot position pattern obtained by deleting a symbol that does not include a pilot in the pattern is 7 when the number of symbols is 7, and the pilot position pattern is from the number of symbols 6
  • the number of subcarriers with 18 subcarriers is increased by one at the end of the symbol of the pilot position pattern corresponding to the physical resource block.
  • the pilot position pattern obtained after the pilot symbol is included.
  • the pilot position in the pilot position pattern of the other antenna is in the pilot pattern of the first antenna.
  • the pilot positions are adjacent.
  • the femtocell base station cooperates to determine the pilot location pattern of the first femtocell, the pilot location in the pilot location pattern of the other femtocells and the first femto The pilot positions in the pilot pattern of the cell are adjacent.
  • the femtocell base station uses the same pilot position pattern in transmitting each frame of data; or, uses frequency hopping to transmit, and uses different pilot position patterns in units of N frames, where N is greater than An integer equal to 1.
  • the present invention further provides a base station for implementing pilot allocation of a femto cell, including a connected pilot position determining module and a pilot signal transmitting module;
  • a pilot position determining module configured to determine a number and a position of a femto cell pilot in a physical resource block, that is, a pilot position pattern; the pilot signal transmitting module, configured to be at the pilot position A pilot signal is transmitted at a pilot position indicated by the pattern, and the pilot position is one or more of positions occupied by pilots of the macro cell pilot in the physical resource block.
  • the position of the pilot in the pilot position pattern is one or more of the following positions: symbol 0 subcarrier 8, symbol 1 subcarrier 16, symbol 2 subcarrier 0, symbol 3 subcarrier 8, symbol 4 subcarrier 16, symbol 5 subcarrier 0.
  • the pilot position pattern is a pilot position corresponding to the physical resource block whose number of symbols is 6 and the number of subcarriers is 18.
  • a pilot position pattern obtained by deleting a symbol that does not include a pilot in the pattern is 7 when the number of symbols is 7, and the pilot position pattern is from the number of symbols
  • a pilot position pattern obtained by adding a pilot symbol is added to the end of the symbol of the pilot position pattern corresponding to the physical resource block corresponding to the physical resource block of 18.
  • the pilot position determining module is further used in the pilot signal transmitting module When transmitting with multiple antennas, after determining the pilot position pattern of the first antenna, the pilot position in the pilot position pattern of the other antenna is adjacent to the pilot position in the pilot pattern of the first antenna.
  • the pilot position determining module is further configured to: after determining a pilot position pattern of the first femto cell in the case of multi-femto cell cooperation, a pilot position in a pilot location pattern of the other femto cell Adjacent to the pilot position in the pilot pattern of the first femto cell.
  • the pilot position determining module is configured to determine a plurality of different pilot position patterns after determining the number of the femto cell pilots in one physical resource block; and the pilot signal transmitting module is further used
  • the same pilot position pattern is used in transmitting each frame of data; or, hopping is used to transmit, and different pilot position patterns are used in units of N frames, where N is an integer greater than or equal to 1.
  • the method further includes a pilot position pattern notification module connected to the pilot position determining module, where the pilot position pattern notification module is configured to use the same pilot when the pilot signal transmitting module transmits each frame of data.
  • the pilot location pattern is notified to the femto cell mobile terminal through the broadcast channel; and is also used to transmit in the frequency hopping manner in the pilot signal transmitting module, and use different pilots in units of N frames.
  • the pilot position pattern and the frequency hopping transmission order of the pilot position pattern are notified to the femto cell mobile terminal through the broadcast channel.
  • the present invention further provides a mobile terminal that implements pilot allocation of a femto cell, including a pilot position resolution module and a pilot signal transmission module; and the pilot position resolution module is configured to be used from a femto
  • the cell base station receives the pilot location pattern from which the number and location of the femto cell pilots in one physical resource block are parsed; the pilot signal transmitting module is configured to be used at a pilot position indicated by the pilot location pattern Transmitting a pilot signal, the pilot position being one or more of locations occupied by pilots of a macro cell pilot in a physical resource block.
  • the position of the pilot in the pilot position pattern is one or more of the following positions: symbol 0 subcarrier 8, symbol 1 subcarrier 16, symbol 2 subcarrier 0, symbol 3 subcarrier 8, symbol 4 subcarrier 16, symbol 5 subcarrier 0.
  • the pilot position pattern is a pilot bit corresponding to the physical resource block whose number of symbols is 6 and the number of subcarriers is 18. a pilot position pattern obtained by deleting a symbol that does not include a pilot in the pattern; the size of the physical resource block is 7 when the number of symbols is 7, and the pilot position pattern is from the number of symbols for
  • a pilot position pattern obtained by adding a pilot-free symbol is added to the end of the symbol of the pilot position pattern corresponding to the physical resource block of the number of sub-carriers of 18.
  • the pilot signal transmitting module is further configured to: when the pilot position resolution module receives a pilot position pattern from the femto cell, use the pilot position pattern when transmitting each frame of data; And a frequency hopping transmission sequence of the plurality of pilot position patterns when the pilot position resolution module receives the plurality of pilot position patterns and the frequency hopping transmission order of the pilot position pattern from the femto cell.
  • the pilot signal is transmitted in a frequency hopping manner.
  • the method of the invention provides a design idea for the pilot design of the femto cell, reduces the overhead of transmitting the pilot signal, improves the system performance, and is compatible with the pilot of the macro cell, based on the pilot design.
  • the pilot design of the femto cell reduces the overhead design, reduces the interference between the systems when the cells coexist through frequency hopping, and simplifies the design of the transmitter.
  • 1 is a schematic diagram of pilot design of a macro cell in the prior art
  • FIG. 2 is a flow chart of a method for allocating a femtocell pilot in the present invention
  • 3A to 3D are schematic diagrams showing a pilot position of a single antenna femtocell reduced to 1/3 overhead with reference to FIG. 1;
  • 4A to 4F are schematic diagrams showing a pilot position of a single antenna femtocell reduced to 1/6 overhead with reference to FIG. 1;
  • 5A to 5B are schematic diagrams showing a pilot position of a single antenna femtocell reduced to 1/2 overhead with reference to FIG. 1;
  • Figure 6 is a picocell pilot position pattern representation for multi-femto cell multi-cell cooperation or multiple antennas.
  • the pilot allocation method of the femto cell in the present invention refers to the pilot design mode of the macro cell (deformed on the basis of the standard macro cell pilot design), and retains the existing pilot position of the macro cell to reduce the overhead design, and satisfies the At the same time as the performance of the picocell, the throughput is improved and the system performance is improved.
  • the method for designing pilots for a femto cell in the present invention is applicable to a macro cell and a femto cell overlap frequency sharing scenario, and is also applicable to a femto cell dedicated frequency scenario.
  • the present invention is applicable to the pilot allocation of the downlink common pilot signal and the downlink dedicated pilot signal of the femto cell, and is also applicable to the pilot allocation of the uplink resource cell of the same resource size.
  • the femtocell base station determines the number and location of the femtocell pilots in one physical resource block, ie, determines a pilot location pattern, and the pilot location indicated by the femtocell base station or the femtocell mobile terminal in the pilot location pattern And transmitting a pilot signal, where the pilot position is one or more of locations occupied by pilots of the macro cell pilot in the physical resource block.
  • the pilot signal can be used for the common pilot signal used by all users, and the dedicated pilot signal transmitted on the dedicated frequency band allocated to a specific user can only be used for a specific user.
  • a base station for implementing pilot allocation of a femto cell includes a connected pilot position determining module and a pilot signal transmitting module, and a pilot position pattern notification module connected to the pilot position determining module;
  • a pilot position determining module configured to determine a number and a position of a femto cell pilot in a physical resource block, that is, a pilot position pattern; and is further configured to: when the pilot signal transmitting module uses multiple antennas to transmit, determine After the pilot position pattern of one antenna, the pilot position in the pilot position pattern of the other antenna is adjacent to the pilot position in the pilot pattern of the first antenna; and is also used in the case of multi-femtocell cooperation, After determining the pilot position pattern of the first femto cell, the pilot position in the pilot position pattern of the other femto cell is adjacent to the pilot position in the pilot pattern of the first femto cell; After the number of pilots in a physical resource block is determined by the femto cell pilot, a plurality of different pilot position patterns are determined;
  • a pilot signal transmitting module configured to send a pilot signal at a pilot position indicated by the pilot position pattern, where the pilot position is one or more positions of a pilot of a macro cell pilot in a physical resource block Also used to use the same pilot position pattern in transmitting each frame of data; or, using frequency hopping to transmit, using different pilot position patterns in N frames, ⁇ is an integer greater than or equal to 1 . .
  • the position of the pilot in the pilot position pattern is one or more of the following positions: Symbol 0 subcarrier 8, symbol 1 subcarrier 16, symbol 2 Subcarrier 0, Symbol 3 Subcarrier 8, Symbol 4 Subcarrier 16, Symbol 5 Subcarrier 0.
  • the number of subcarriers is 18, and the pilot position pattern is deleted from the pilot position pattern corresponding to the physical resource block whose number of symbols is 6 and the number of subcarriers is 18. a pilot position pattern obtained after the frequency symbol;
  • the pilot position pattern is incremented from the end of the symbol of the pilot position pattern corresponding to the physical resource block with 6 symbols and 18 subcarriers.
  • the pilot position pattern obtained without the pilot symbol.
  • a pilot position pattern notification module configured to notify a femto area mobile terminal by using a broadcast channel when the same pilot position pattern is used when the pilot signal transmitting module transmits each frame of data;
  • the pilot signal transmitting module transmits by using a frequency hopping method and uses different pilot position patterns in units of N frames, the pilot position pattern and the frequency hopping transmission sequence of the pilot position pattern are notified through the broadcast channel.
  • a mobile terminal that implements pilot allocation of a femto cell includes a pilot position resolution module and a pilot signal transmission module;
  • the pilot position resolution module is configured to receive a pilot location pattern from a femtocell base station, and parse out the number and location of the femtocell pilots in a physical resource block;
  • the pilot signal transmitting module is configured to send a pilot signal at a pilot position indicated by the pilot position pattern, where the pilot position is a position of a pilot of a macro cell pilot in a physical resource block. Or a plurality of; when the pilot position resolution module receives a pilot position pattern from the femto cell, the pilot position pattern is used when transmitting each frame of data; and is also used in the guide When the frequency position resolution module receives the plurality of pilot position patterns and the frequency hopping transmission sequence of the pilot position pattern from the femto cell, the pilot signal is transmitted by using a frequency hopping transmission sequence hopping manner of the plurality of pilot position patterns. .
  • the femto cell pilot allocation method in the present invention includes the following steps: Step 201: The femtocell base station determines the number and location of the femtocell pilots in one physical resource block, that is, determines a pilot location pattern, and notifies the determined pilot location pattern to notify the mobile terminal of the femto cell through the broadcast channel. ;
  • the mobile terminal of the femtocell is simultaneously notified by the broadcast channel of the determined pilot pattern of the hopping transmission and the sequence of the hopping transmission;
  • both the femtocell base station and the mobile terminal use the default one or more pilot location patterns and frequency hopping transmission sequences that have been determined by the system.
  • Step 202 The femtocell base station or the femtocell mobile terminal sends a pilot signal at a pilot position indicated by the pilot location pattern, where the pilot location is a pilot of a macro cell pilot in a physical resource block. One or more of the locations, the process ends.
  • the femtocell base station determines the number of pilots in the physical resource block according to the moving speed of the femtocell mobile terminal. As shown in Figure 1, in the case of a macro cell, each macro cell in each physical resource block occupies 6 pilot subcarriers. Since the mobile terminal of the femto cell moves at a slow speed, the number of pilot subcarriers occupied by the femtocell base station in each physical resource block is less than 6.
  • FIG. 1 is a schematic diagram of a pilot position pattern of a single antenna femto cell reduced to 1/3 overhead according to FIG. 1; a position of a slanted line indicates a pilot subcarrier, and a position of a blank block indicates a data sub- Carrier.
  • the femto cell occupies 2 pilots per physical resource block.
  • Figures 3A through 3D show different pilot position patterns.
  • the femto cell occupies 15 pilot position patterns with a pilot number of 2 in each physical resource block, not all of which are shown in the drawings.
  • FIG. 1 is a schematic diagram of a pilot position pattern of a single antenna femtocell reduced to 1/6 overhead with reference to FIG. 1; a position of a diagonal padding indicates a pilot subcarrier, and a position of a blank block indicates a data subcarrier. Carrier.
  • the femto cell occupies 1 pilot per physical resource block.
  • Figure 4A to 4F shows different pilot position patterns. As shown in FIGS. 4A to 4F, the femto cell occupies 6 pilot position patterns of pilot number 2 in each physical resource block.
  • FIG. 1 is a schematic diagram of a pilot position pattern of a single-antenna femto cell reduced to 1/2 overhead with reference to FIG. 1; a position of a diagonal padding indicates a pilot subcarrier, and a position of a blank block indicates a data sub- Carrier.
  • the femto cell occupies 3 pilots per physical resource block.
  • Figures 5A through 5B show different pilot position patterns.
  • the femto cell occupies 20 pilot position patterns with a pilot number of 3 in each physical resource block, not all of which are shown in the drawings.
  • a pilot allocation method for an OFDM system is illustrated in the manner of FIG. 3A.
  • the physical resource block to which the pilot is allocated includes six symbols and is numbered as symbol 0, symbol 1, symbol 2, symbol 3, symbol 4, and symbol 5.
  • the antenna number is antenna 0, the pilot is allocated at symbol 0, the 8th subcarrier, the pilot is allocated at symbol 5, the 0th subcarrier, and the other symbols are not allocated as the data subcarrier.
  • the pilot allocation method shown in Figure 4 or Figure 5 is the same.
  • the femtocell base station uses the same pilot location pattern in each subframe.
  • the pilot interference of the macro cell is homogenized, and the femtocell base station uses different pilot position patterns in units of N frames, where N is an integer greater than or equal to 1.
  • N is an integer greater than or equal to 1.
  • different pilot position patterns are used for each N frame.
  • the M frame is in accordance with the pilot position pattern of FIG. 3A
  • the M+N frame is according to the pilot position pattern of FIG. 3B
  • the M+2N frame is according to the pilot position pattern of FIG. 3C
  • the M+3N frame is according to the pilot position of FIG. 3A.
  • the pattern and so on, where M and N are positive integers greater than zero.
  • the multi-antenna transmission mode is adopted for the normal subframe femtocell base station:
  • the pilot position pattern of the first antenna is determined, and the pilot position pattern of the other antenna is determined.
  • the pilot position is adjacent to the pilot position in the pilot pattern of the first antenna, where the adjacent is the frequency i or the time i or adjacent.
  • the physical resource block to which the pilot is allocated includes six symbols and is numbered as symbol 0, symbol 1, symbol 2, symbol 3, symbol 4, and symbol 5, and the two antenna numbers are antennas.
  • the allocation rules of the pilot subcarriers are as follows:
  • the eighth subcarrier is allocated to antenna 0 as a pilot subcarrier, and the pilot subcarrier is not allocated to antenna 1, but antenna 1 is specified not to transmit any data on the eighth subcarrier;
  • the 9th subcarrier is allocated to antenna 1, and the pilot subcarrier is not allocated to antenna 0, but it is specified that antenna 0 does not transmit any data on the ninth subcarrier;
  • the 16th subcarrier is allocated to antenna 0, the pilot subcarrier is not allocated to antenna 1, but antenna 1 is specified to not transmit any data on the 16th subcarrier;
  • the 17th subcarrier is allocated to antenna 1, no pilot subcarrier is allocated to antenna 0, but antenna 0 is specified to not transmit any data on the 17th subcarrier;
  • the femtocell base station cooperates with the multi-femtocell to allocate a single antenna pilot:
  • the pilot positions in the pattern are adjacent, where the adjacent refers to the frequency domain or the time domain adjacent.
  • the physical resource block to which the pilot is allocated includes six symbols and is numbered as symbol 0, symbol 1, symbol 2, symbol 3, symbol 4, and symbol 5, two.
  • the femto cell number is cell 0 and cell 1, and the allocation rules of the pilot subcarrier are as follows:
  • the eighth subcarrier is allocated to cell 0 as a pilot subcarrier, and the pilot subcarrier is not allocated to cell 1, but cell 1 is not specified to transmit any data on the eighth subcarrier;
  • the ninth subcarrier is allocated to cell 1, and the pilot subcarrier is not allocated to cell 0, but cell 0 is not specified to transmit any data on the ninth subcarrier;
  • the pilot allocation is allocated on the pilot pattern of the original FIG. 1 in consideration of system compatibility.
  • the irregular subframe in the subframe.
  • the pattern obtained by deleting one OFDM symbol of the pilot in the physical resource block pilot pattern of the deleted normal subframe is used.
  • the subframe includes 7 OFDM symbols, the pattern obtained by adding an OFDM symbol that does not include the pilot in the physical resource block pilot pattern of the regular subframe is used.
  • the multi-antenna transmission situation or the multi-cell cooperation is the same as the pilot allocation method when the normal subframe is used.
  • the femtocell mobile terminal receives the broadcast information sent by the femtocell base station through the broadcast channel, learns the pilot location pattern determined by the femtocell base station, and uses the pilot location pattern when transmitting the uplink pilot signal to the femtocell base station.
  • the single-antenna transmission method using the same method as the above-mentioned base station transmission method may also adopt a multi-antenna transmission method or a frequency hopping transmission method, and the specific method is the same as that used by the femtocell base station.
  • the pilot signal at this time includes the user's uplink dedicated pilot signal.
  • the method of the present invention provides a design idea for the pilot design of the femto cell, reduces the overhead of transmitting the pilot signal, improves system performance, and is compatible with the pilot of the macro cell, with its pilot design. Based on the pilot design of the femto cell, the overhead design is reduced, and the interference between the systems when the cells coexist is reduced by frequency hopping; and the design of the transmitter is simplified.

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Description

一种实现毫微微小区导频分配的方法、 基站及移动终端
技术领域
本发明涉及移动通信领域, 尤其涉及正交频分复用系统中实现毫微微小 区 (FemtoCell )导频分配的方法、 基站及移动终端。
背景技术
在无线通讯系统中, 作为一种多载波传输模式, 正交频分复用 (OFDM, Orthogonal Frequency Division Multiplexing )通过将一高速传输的数据流转换 为一组低速并行传输的数据流, 使系统对多径衰落信道频率选择性的敏感度 大大降低, 而循环前缀的引入, 又进一步增强了系统抗符号间干扰(ISI, Inter-symbol Interference ) 的能力, 除此之外正交频分复用技术允许各个子信 道频谱相互交叠使带宽利用率高、 实现简单等特点使正交频分复用技术在无 线通信流域的应用越来越广。
在无线通讯环境中, 基站是为终端提供服务的设备, 基站通过下行链路
(即基站到移动终端方向) 向终端发送数据, 终端通过上行链路(即终端到 基站方向 )进行数据发送与接收。 高速、 高质量的数据服务一般受信道环境 的影响, 移动环境受衰落、 阴影、 用户移动引起的多普勒影响等等。 要有效 的克服这些影响因素, 为无线系统提供高质量的服务, 对信道有效的进行估 计和补偿是十分必要的, 目前在对正交频分复用系统的研究中, 信道估计方 法分两类: 基于导频的信道估计和盲估计。 目前更侧重于釆用基于导频的信 道估计算法, 即在发射端发送一段接收端已知的导频子载波, 接收端检测经 过传输后的接收信号来获得信道信息, 它可以很好地跟踪信道的变化, 提升 接收机的性能。 在基于导频的信道估计技术研究中, 除了导频信道估计算法 性能之外, 发送端导频设计在很大程度上直接影响着系统性能。
导频信号的分配应该考虑无线衰落信道的统计特性即相干带宽和相干时 间, 导频信号的分配还应该考虑正交频分复用系统的上行和下行发射的不同 特性。 如果导频信号是下行发射, 则既包括在全频带发送的可以为全部用户 使用的公共导频信号, 又包括系统在给特定用户分配的专用频带上发送的只 能为特定用户使用的专用导频信号。 如果导频信号是上行发射, 则包括在系 统给特定用户分配的专用频带上发送的只能为特定用户使用的专用导频信 号。 在系统给特定用户分配的专用频带上, 如果专用频带是多个离散的物理 资源块组成, 那么每个物理资源块必须能够独立的进行数据解调, 也就是说 每个物理资源块上的专用导频信号必须足以进行独立的信道估计。
下面列举了目前存在的一些导频信道分配方法:
在' ΊΕΕΕ 802.16e-2005"规范中, 当下行子信道分配模式为 FUSC (全部子 信道应用方式), 会出现两个导频子载波的最小间隔是 12个子载波。 当无线 衰落信道的相干带宽小于 12个子载波时, 地板效应无法避免。
在" IEEE 802.16e-2005"规范中, 当下行子信道分配模式为 PUSC (部分 子信道应用方式), 也会出现两个导频子载波的最小间隔是 12个子载波, 地 板效应仍然无法避免。
在" IEEE 802.16e-2005"规范中, 当上行子信道分配模式为 PUSC (部分 子信道应用方式) , 单天线导频的开销达到 33.3%, 极大的减小了频谱效率。
在正交频分复用系统中, 资源分配是按照二维分配的, 一维是时间轴按 占用正交频分复用符号分配, 另一维是频率资源占用的按占用频率子载波分 配。 如图 1所示的, 针对的是移动终端的移动速度为 120Km/h~350Km/h (千 米每小时)的宏小区, 在现有 IEEE802.16m OFDM系统描述设计中在一个物 理资源块中对宏小区的导频设计, 纵向以时间 (OFDM符号)为单位, 横向 以频率(子载波)为单位。 多天线发射时, 以 2个天线为例, 包括天线 1和 天线 2, 斜线填充的方块表示天线 1对应的导频, 竖直线填充的方块表示天 线 2对应的导频, 图中所示天线 1和天线 2的导频在频率上相邻, 两天线对 应的导频也可在时域相邻 (图中未示出) 。 多宏小区协作时, 以 2个宏小区 为例, 包括宏小区 1和宏小区 2, 斜线填充的方块表示宏小区 1对应的导频, 竖直线填充的方块表示宏小区 2对应的导频, 图中所示宏小区 1和宏小区 2 的导频在频率上相邻, 两天线对应的导频也可在时域相邻 (图中未示出) 。
毫微微小区 ( FemtoCell )技术是一种扩展移动通信室内覆盖的解决方案, 使用 IP协议, 可以把用户手机发出的话音和数据呼叫传输到基于标准接口的 核心网络, 可连接到任何现有的基于 IP的传送网络。 毫微微小区基站与运营 商的其它移动基站同制式、 同频段, 手机等移动终端均可以通用。 毫微微小 区基站体积小, 功率低(发射功率为 10 100毫瓦), 覆盖半径为 50 200米, 支持 4 ~ 6个活动用户, 允许的最大用户运动速度为 10公里 /小时; 主要以为 提高室内覆盖的能力的住宅用户以及 SOHO ( Small Office Home Office )室内 用户为主要服务对象。
目前, 毫微微小区导频设计方式还未定义, 其应用场景与宏小区不同, 由于宏小区的导频开销较大, 考虑毫微微小区基站体积小、 功率低、 服务对 象用户数目较小且移动速度低等特点, 直接将宏小区的导频设计应用于毫微 微小区的可能性较小, 因此有必要对毫微微小区进行导频设计。
发明内容
本发明所要解决的技术问题是提供一种实现毫微微小区导频分配的方 法、 基站及移动终端, 降低发送导频信号的开销, 提高系统性能。
为了解决上述技术问题, 本发明提供了一种实现毫微微小区导频分配的 方法, 包括: 毫微微小区基站确定毫微微小区导频在一个物理资源块中的个 数和位置即确定导频位置图样, 毫微微小区基站或毫微微小区移动终端在所 述导频位置图样指示的导频位置上发送导频信号, 所述导频位置是宏小区导 频在物理资源块中导频所占位置的一个或多个。
进一步地, 所述物理资源块的大小为符号数为 6子载波数为 18时, 所述 导频位置图样中导频的位置是下述位置中一个或多个: 符号 0子载波 8, 符 号 1子载波 16, 符号 2子载波 0, 符号 3子载波 8, 符号 4子载波 16, 符号 5 子载波 0。
进一步地, 所述物理资源块的大小为符号数为 5子载波数为 18时, 所述 导频位置图样是从所述符号数为 6子载波数为 18的物理资源块对应的导频位 置图样中删除一不包含导频的符号后得到的导频位置图样; 所述物理资源块 的大小为符号数为 7子载波数为 18时,所述导频位置图样是从所述符号数为 6子载波数为 18的物理资源块对应的导频位置图样的符号末尾处增加一不包 含导频的符号后得到的导频位置图样。
进一步地, 所述毫微微小区基站釆用多天线发射时, 确定第一个天线的 导频位置图样后, 其它天线的导频位置图样中导频位置与第一个天线的导频 图样中的导频位置相邻。
进一步地, 所述毫微微小区基站在多毫微微小区协作时, 确定第一个毫 微微小区的导频位置图样后, 其它毫微微小区的导频位置图样中导频位置与 第一个毫微微小区的导频图样中的导频位置相邻。
进一步地, 所述毫微微小区基站在发射每帧数据中釆用相同的导频位置 图样; 或者, 釆用跳频方式发射, 以 N帧为单位釆用不同的导频位置图样, N为大于等于 1的整数。
为了解决上述技术问题, 本发明还提供了一种实现毫微微小区导频分配 的基站, 包括相连的导频位置确定模块和导频信号发射模块;
所述导频位置确定模块, 用于确定毫 微小区导频在一个物理资源块中 的个数和位置即确定导频位置图样; 所述导频信号发射模块, 用于在所述导 频位置图样指示的导频位置上发送导频信号, 所述导频位置是宏小区导频在 物理资源块中导频所占位置的一个或多个。
进一步地, 所述物理资源块的大小为符号数为 6子载波数为 18时, 所述 导频位置图样中导频的位置是下述位置中一个或多个: 符号 0子载波 8, 符 号 1子载波 16, 符号 2子载波 0, 符号 3子载波 8, 符号 4子载波 16, 符号 5 子载波 0。
进一步地, 所述物理资源块的大小为符号数为 5子载波数为 18时, 所述 导频位置图样是从所述符号数为 6子载波数为 18的物理资源块对应的导频位 置图样中删除一不包含导频的符号后得到的导频位置图样; 所述物理资源块 的大小为符号数为 7子载波数为 18时,所述导频位置图样是从所述符号数为 6子载波数为 18的物理资源块对应的导频位置图样的符号末尾处增加一不包 含导频的符号后得到的导频位置图样。
进一步地, 所述导频位置确定模块, 还用于在所述导频信号发射模块釆 用多天线发射时, 确定第一个天线的导频位置图样后, 其它天线的导频位置 图样中导频位置与第一个天线的导频图样中的导频位置相邻。
进一步地, 所述导频位置确定模块, 还用于在多毫微微小区协作情况下, 确定第一个毫微微小区的导频位置图样后, 其它毫微微小区的导频位置图样 中导频位置与第一个毫微微小区的导频图样中的导频位置相邻。
进一步地, 所述导频位置确定模块, 用于确定毫 微小区导频在一个物 理资源块中的个数后, 确定多个不同的导频位置图样; 所述导频信号发射模 块, 还用于在发射每帧数据中釆用相同的导频位置图样; 或者, 釆用跳频方 式发射, 以 N帧为单位釆用不同的导频位置图样, N为大于等于 1的整数。
进一步地, 还包括与导频位置确定模块相连的导频位置图样通知模块; 所述导频位置图样通知模块, 用于在所述导频信号发射模块发射每帧数据时 釆用相同的导频位置图样时, 通过广播信道将此导频位置图样通知给毫微微 小区移动终端; 还用于在所述导频信号发射模块釆用跳频方式发射, 以 N帧 为单位釆用不同的导频位置图样时, 通过广播信道将导频位置图样以及导频 位置图样的跳频发射顺序通知给毫微微小区移动终端。
为了解决上述技术问题, 本发明还提供了一种实现毫微微小区导频分配 的移动终端, 包括导频位置解析模块和导频信号发射模块; 所述导频位置解 析模块, 用于从毫微微小区基站接收导频位置图样从中解析出毫微微小区导 频在一个物理资源块中的个数和位置; 所述导频信号发射模块, 用于在所述 导频位置图样指示的导频位置上发送导频信号, 所述导频位置是宏小区导频 在物理资源块中导频所占位置的一个或多个。
进一步地, 所述物理资源块的大小为符号数为 6子载波数为 18时, 所述 导频位置图样中导频的位置是下述位置中一个或多个: 符号 0子载波 8, 符 号 1子载波 16, 符号 2子载波 0, 符号 3子载波 8, 符号 4子载波 16, 符号 5 子载波 0。
进一步地, 所述物理资源块的大小为符号数为 5子载波数为 18时, 所述 导频位置图样是从所述符号数为 6子载波数为 18的物理资源块对应的导频位 置图样中删除一不包含导频的符号后得到的导频位置图样; 所述物理资源块 的大小为符号数为 7子载波数为 18时,所述导频位置图样是从所述符号数为
6子载波数为 18的物理资源块对应的导频位置图样的符号末尾处增加一不包 含导频的符号后得到的导频位置图样。
进一步地, 所述导频信号发射模块, 还用于所述导频位置解析模块从所 述毫微微小区接收到一导频位置图样时, 发射每帧数据时均釆用此导频位置 图样; 还用于在所述导频位置解析模块从所述毫微微小区接收到多个导频位 置图样以及导频位置图样的跳频发射顺序时, 以此多个导频位置图样的跳频 发射顺序跳频方式发射导频信号。
釆用本发明的方法, 为毫微微小区的导频设计提供了一种设计思路, 降 低发送导频信号的开销, 提高系统性能; 且兼容宏小区的导频, 以其导频设 计为基础进行毫微微小区的导频设计, 降低开销设计, 通过跳频降低小区共 存时系统之间的干扰; 同时简化了发射机的设计。
附图概述
图 1是现有技术中宏小区的导频设计示意图;
图 2是本发明中毫微微小区导频分配方法的流程图;
图 3A至 3D是以图 1为参考降低至 1/3开销的单天线毫微微小区导频位 置图样示意图;
图 4A至 4F是以图 1为参考降低至 1/6开销的单天线毫微微小区导频位 置图样示意图;
图 5A至 5B是以图 1为参考降低至 1/2开销的单天线毫微微小区导频位 置图样示意图;
图 6是多毫微微小区多小区协作或多天线的毫微微小区导频位置图样示 意图。
本发明的较佳实施方式 本发明中毫微微小区的导频分配方法, 参考宏小区的导频设计方式(在 标准宏小区导频设计基础上进行变形) , 保留宏小区的已有导频位置进行降 开销设计, 满足毫微微小区的性能的同时, 提高吞吐率, 提高系统性能。
本发明中为毫微微小区设计导频的方式适用于宏小区和毫微微小区重叠 频率共享场景, 也适用于毫微微小区专用频率场景。 本发明可适用于毫微微 小区下行公共导频信号和下行专用导频信号的导频分配, 也适用于上行同样 资源大小毫 微小区的导频分配。
毫微微小区基站确定毫微微小区导频在一个物理资源块中的个数和位置 即确定导频位置图样, 毫微微小区基站或毫微微小区移动终端在所述导频位 置图样指示的导频位置上发送导频信号, 所述导频位置是宏小区导频在物理 资源块中导频所占位置的一个或多个。 此时导频信号可以用于全部用户使用 的公共导频信号, 和给特定用户分配的专用频带上发送的只能为特定用户使 用的专用导频信号。
本发明中, 实现毫微微小区导频分配的基站, 包括相连的导频位置确定 模块和导频信号发射模块, 与导频位置确定模块相连的导频位置图样通知模 块;
导频位置确定模块, 用于确定毫 微小区导频在一个物理资源块中的个 数和位置即确定导频位置图样; 还用于在导频信号发射模块釆用多天线发射 时, 确定第一个天线的导频位置图样后, 其它天线的导频位置图样中导频位 置与第一个天线的导频图样中的导频位置相邻; 还用于在多毫微微小区协作 情况下, 确定第一个毫微微小区的导频位置图样后, 其它毫微微小区的导频 位置图样中导频位置与第一个毫微微小区的导频图样中的导频位置相邻; 还 用于确定毫微微小区导频在一个物理资源块中的个数后, 确定多个不同的导 频位置图样;
导频信号发射模块, 用于在所述导频位置图样指示的导频位置上发送导 频信号, 所述导频位置是宏小区导频在物理资源块中导频所占位置的一个或 多个; 还用于在发射每帧数据中釆用相同的导频位置图样; 或者, 釆用跳频 方式发射,以 N帧为单位釆用不同的导频位置图样 , Ν为大于等于 1的整数。。 物理资源块的大小为符号数为 6子载波数为 18时,导频位置图样中导频 的位置是下述位置中一个或多个: 符号 0子载波 8,符号 1子载波 16, 符号 2 子载波 0, 符号 3子载波 8, 符号 4子载波 16, 符号 5子载波 0。
物理资源块的大小为符号数为 5子载波数为 18时,导频位置图样是从所 述符号数为 6子载波数为 18的物理资源块对应的导频位置图样中删除一不包 含导频的符号后得到的导频位置图样;
物理资源块的大小为符号数为 7子载波数为 18时,导频位置图样是从所 述符号数为 6子载波数为 18的物理资源块对应的导频位置图样的符号末尾处 增加一不包含导频的符号后得到的导频位置图样。
导频位置图样通知模块, 用于在所述导频信号发射模块发射每帧数据时 釆用相同的导频位置图样时, 通过广播信道将导频位置图样通知给毫微微小 区移动终端; 还用于在所述导频信号发射模块釆用跳频方式发射, 以 N帧为 单位釆用不同的导频位置图样时, 通过广播信道将导频位置图样以及导频位 置图样的跳频发射顺序通知给毫微微小区移动终端。
本发明中, 实现毫微微小区导频分配的移动终端, 包括导频位置解析模 块和导频信号发射模块;
所述导频位置解析模块, 用于从毫微微小区基站接收导频位置图样从中 解析出毫微微小区导频在一个物理资源块中的个数和位置;
所述导频信号发射模块, 用于在所述导频位置图样指示的导频位置上发 送导频信号, 所述导频位置是宏小区导频在物理资源块中导频所占位置的一 个或多个; 还用于所述导频位置解析模块从所述毫微微小区接收到一导频位 置图样时, 发射每帧数据时均釆用此导频位置图样; 还用于在所述导频位置 解析模块从所述毫微微小区接收到多个导频位置图样以及导频位置图样的跳 频发射顺序时, 以此多个导频位置图样的跳频发射顺序跳频方式发射导频信 号。
如图 2所示, 本发明中毫微微小区导频分配方法包括以下步骤: 步骤 201 , 毫微微小区基站确定毫微微小区导频在一个物理资源块中的 个数和位置即确定导频位置图样; 并将其确定的导频位置图样通过广播信道 通知毫 微小区的移动终端;
在此步骤中, 如果毫微微小区基站还釆用跳频均勾化干扰技术, 需同时 通过广播信道通知毫微微小区的移动终端其确定的跳频发射的导频图样及跳 频发射的顺序; 或者, 毫微微小区基站和移动终端均釆用系统已确定好的默 认的一种或多种导频位置图样及跳频发射顺序。
步骤 202, 毫微微小区基站或毫微微小区移动终端在所述导频位置图样 指示的导频位置上发送导频信号, 所述导频位置是宏小区导频在物理资源块 中导频所占位置的一个或多个, 流程结束。
实施例一中, 对于正规子帧毫微微小区基站釆用单天线发射方式: 对于正规子帧, 即大小为 OFDM系统的可用子载波个数 χ6个 OFDM符 号的资源方块,毫微微小区基站将该资源方块依序均分为 X个大小为 18个连 续子载波 χ6个连续 OFDM符号的物理资源块, X=floor(OFDM系统的可用子 载波个数 /18), 其中 floor(v)函数表示取不大于 V的最大整数。
毫微微小区基站根据毫微微小区移动终端的移动速度确定物理资源块中 导频的个数。 如图 1所示, 宏小区情况下, 每个物理资源块中每个宏小区占 用导频子载波数为 6个。 由于毫微微小区的移动终端移动速度慢, 毫微微小 区基站在每个物理资源块中占用导频子载波数小于 6。
如图 3A至 3D所示, 是以图 1为参考降低至 1/3开销的单天线毫微微小 区导频位置图样示意图; 斜线填充的位置表示导频子载波, 空白方块的位置 表示数据子载波。 毫微微小区在每个物理资源块中占用导频数为 2。 图 3A至 3D表示了不同的导频位置图样。毫微微小区在每个物理资源块中占用导频数 为 2的导频位置图样共 15种, 附图中没有全部示出。
如图 4A至 4F所示, 是以图 1为参考降低至 1/6开销的单天线毫微微小 区导频位置图样示意图; 斜线填充的位置表示导频子载波, 空白方块的位置 表示数据子载波。 毫微微小区在每个物理资源块中占用导频数为 1。 图 4A至 4F表示了不同的导频位置图样。 如图 4A至 4F所示, 毫微微小区在每个物理 资源块中占用导频数为 2的导频位置图样共 6种。
如图 5A至 5B所示, 是以图 1为参考降低至 1/2开销的单天线毫微微小 区导频位置图样示意图; 斜线填充的位置表示导频子载波, 空白方块的位置 表示数据子载波。 毫微微小区在每个物理资源块中占用导频数为 3。 图 5A至 5B表示了不同的导频位置图样。 毫微微小区在每个物理资源块中占用导频数 为 3的导频位置图样共 20种, 附图中没有全部示出。
以图 3A的方式说明 OFDM系统的导频分配方法, 单天线发射时, 分配 导频的物理资源块包括六个符号并编号为符号 0、 符号 1、 符号 2、 符号 3、 符号 4和符号 5 , —个天线编号为天线 0, 在符号 0、 第 8个子载波处分配导 频, 在符号 5、 第 0个子载波分配导频, 其它符号不分配导频作为数据子载 波。 图 4或图 5所示的导频分配方式同理。
毫微微小区基站在每个子帧中釆用相同的导频位置图样。
在宏小区和毫微微小区重叠频率共享场景时, 在确定了毫微微小区的导 频开销后 (即确定了使用降低至 1/2, 1/3或 1/6的导频设计方式) , 为了均 匀化与宏小区的导频干扰, 毫微微小区基站以 N帧为单位釆用不同的导频位 置图样, N为大于等于 1的整数。 例如, 确定了在每个物理资源块中使用的 导频数为 2个后, 每 N帧釆用不同的导频位置图样。 如第 M帧按照图 3A的 导频位置图样, M+N帧按图 3B的导频位置图样, M+2N帧按图 3C的导频位 置图样, M+3N帧按图 3A的导频位置图样依次类推, 其中, M和 N均为大 于 0的正整数。
实施例二中, 对于正规子帧毫微微小区基站釆用多天线发射方式: 毫微微小区基站釆用多天线发射时,确定第一个天线的导频位置图样后, 其它天线的导频位置图样中导频位置与第一个天线的导频图样中的导频位置 相邻, 此处的相邻是指频 i或或时 i或相邻。
如图 6所示, 以 2天线为例, 分配导频的物理资源块包括六个符号并编 号为符号 0、 符号 1、 符号 2、 符号 3、 符号 4和符号 5 , 两个天线编号为天线 0和天线 1 , 所述导频子载波的分配规则如下:
在符号 0: 分配第 8个子载波给天线 0作为导频子载波, 不分配导频子 载波给天线 1 , 但是规定天线 1在第 8个子载波上不发送任何数据;
在符号 0: 分配第 9个子载波给天线 1 , 不分配导频子载波给天线 0, 但 是规定天线 0在第 9个子载波上不发送任何数据;
在符号 4: 分配第 16个子载波给天线 0, 不分配导频子载波给天线 1 , 但是规定天线 1在第 16个子载波上不发送任何数据;
在符号 4: 分配第 17个子载波给天线 1 , 不分配导频子载波给天线 0, 但是规定天线 0在第 17个子载波上不发送任何数据;
其它符号不分配导频。
实施例三中, 对于正规子帧毫微微小区基站对于多毫微微小区协作时的 单天线导频分配方式:
毫微微小区基站在多毫微微小区协作情况时, 确定第一个毫微微小区的 导频位置图样后, 其它毫微微小区的导频位置图样中导频位置与第一个毫微 微小区的导频图样中的导频位置相邻, 此处的相邻是指频域或时域相邻。
如图 6所示, 以 2个毫微微小区协作为例, 分配导频的物理资源块包括 六个符号并编号为符号 0、 符号 1、 符号 2、 符号 3、 符号 4和符号 5 , 两个毫 微微小区编号为小区 0和小区 1 , 所述导频子载波的分配规则如下:
在符号 0: 分配第 8个子载波给小区 0作为导频子载波, 不分配导频子 载波给小区 1 , 但是规定小区 1在第 8个子载波上不发送任何数据;
在符号 0: 分配第 9个子载波给小区 1 , 不分配导频子载波给小区 0, 但 是规定小区 0在第 9个子载波上不发送任何数据;
在符号 4: 分配第 16个子载波给小区 0, 不分配导频子载波给小区 1 , 但是规定小区 1在第 16个子载波上不发送任何数据;
在符号 4: 分配第 17个子载波给小区 1 , 不分配导频子载波给小区 0, 但是规定小区 0在第 17个子载波上不发送任何数据; 其它符号不分配导频。
实施例四中, 对于非正规子帧毫微微小区基站的导频分配方式: 对于非正规子帧, 情况一, 大小为 OFDM 系统的可用子载波个数 *5个 OFDM符号的资源方块,将该资源方块依序均分为 X个大小为 N个连续子载 波 χΜ个连续 OFDM符号的物理资源块, 其中 N=18, M=5, X=floor(OFDM 系统的可用子载波个数/ N),其中 floor(v)表示取不大于 V的最大整数。情况二, 大小为 OFDM系统的可用子载波个数 *7个 OFDM符号的资源方块, 将该资 源方块依序均分为 X个大小为 N个连续子载波 χΜ个连续 OFDM符号的物理 资源块, 其中 N=18, M=7, X=floor(OFDM系统的可用子载波个数/ N), 其中 floor(v)表示取不大于 V的最大整数。
毫微微小区与宏小区重叠情况, 考虑其相互干扰, 其导频分配在考虑到 系统兼容性的情况下, 尽量在原有图 1的导频图样上进行分配, 对于非正规 子帧, 子帧中包括 5个 OFDM符号时, 釆用删除正规子帧的物理资源块导频 图样中不包含导频的一个 OFDM符号后得到的图样。子帧包括 7个 OFDM符 号时, 釆用在正规子帧的物理资源块导频图样中增加一不包含导频的 OFDM 符号后得到的图样。
毫微微小区基站釆用非正规子帧时, 多天线发射情况时, 或者多小区协 作情况时, 与釆用正规子帧时的导频分配方式相同。
毫微微小区移动终端通过广播信道接收毫微微小区基站发送的广播信 息, 获知毫微微小区基站确定的导频位置图样, 并在向毫微微小区基站发送 上行导频信号时, 使用此导频位置图样, 釆用与上述基站发送方式相同的方 用单天线发射方式也可釆用多天线发射方式, 也可以釆用跳频发射方式, 具 体方法与毫微微小区基站釆用的方式相同。 此时导频信号包括用户上行专用 导频信号。
当然, 本发明还可有其他多种实施例, 在不背离本发明精神及其实质的 但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。
工业实用性 釆用本发明的方法, 为毫微微小区的导频设计提供了一种设计思路, 降 低发送导频信号的开销, 提高系统性能; 且兼容宏小区的导频, 以其导频设 计为基础进行毫微微小区的导频设计, 降低开销设计, 通过跳频降低小区共 存时系统之间的干扰; 同时简化了发射机的设计。

Claims

权 利 要 求 书
1、 一种实现毫微微小区导频分配的方法, 其特征在于,
毫微微小区基站确定毫微微小区导频在一个物理资源块中的个数和位置 即确定导频位置图样, 毫微微小区基站或毫微微小区移动终端在所述导频位 置图样指示的导频位置上发送导频信号, 所述导频位置是宏小区导频在物理 资源块中导频所占位置的一个或多个。
2、 如权利要求 1所述的方法, 其特征在于,
所述物理资源块的大小为符号数为 6子载波数为 18时,所述导频位置图 样中导频的位置是下述位置中一个或多个: 符号 0子载波 8, 符号 1子载波 16, 符号 2子载波 0, 符号 3子载波 8, 符号 4子载波 16, 符号 5子载波 0。
3、 如权利要求 1所述的方法, 其特征在于,
所述物理资源块的大小为符号数为 5子载波数为 18时,所述导频位置图 样是从所述符号数为 6子载波数为 18的物理资源块对应的导频位置图样中删 除一不包含导频的符号后得到的导频位置图样;
所述物理资源块的大小为符号数为 7子载波数为 18时,所述导频位置图 样是从所述符号数为 6子载波数为 18的物理资源块对应的导频位置图样的符 号末尾处增加一不包含导频的符号后得到的导频位置图样。
4、 如权利要求 1、 2或 3所述的方法, 其特征在于,
所述毫微微小区基站釆用多天线发射时, 确定第一个天线的导频位置图 样后, 其它天线的导频位置图样中导频位置与第一个天线的导频图样中的导 频位置相邻。
5、 如权利要求 1、 2或 3所述的方法, 其特征在于,
所述毫微微小区基站在多毫微微小区协作时, 确定第一个毫微微小区的 导频位置图样后, 其它毫微微小区的导频位置图样中导频位置与第一个毫微 微小区的导频图样中的导频位置相邻。
6、 如权利要求 1、 2或 3所述的方法, 其特征在于,
所述毫微微小区基站在发射每帧数据中釆用相同的导频位置图样;或者, 釆用跳频方式发射, 以 N帧为单位釆用不同的导频位置图样, N为大于等于
1的整数。
7、 一种实现毫微微小区导频分配的基站,其特征在于, 包括相连的导频 位置确定模块和导频信号发射模块;
所述导频位置确定模块, 用于确定毫 微小区导频在一个物理资源块中 的个数和位置即确定导频位置图样;
所述导频信号发射模块, 用于在所述导频位置图样指示的导频位置上发 送导频信号, 所述导频位置是宏小区导频在物理资源块中导频所占位置的一 个或多个。
8、 如权利要求 7所述的基站, 其特征在于,
所述物理资源块的大小为符号数为 6子载波数为 18时,所述导频位置图 样中导频的位置是下述位置中一个或多个: 符号 0子载波 8, 符号 1子载波 16, 符号 2子载波 0, 符号 3子载波 8, 符号 4子载波 16, 符号 5子载波 0。
9、 如权利要求 7所述的基站, 其特征在于,
所述物理资源块的大小为符号数为 5子载波数为 18时,所述导频位置图 样是从所述符号数为 6子载波数为 18的物理资源块对应的导频位置图样中删 除一不包含导频的符号后得到的导频位置图样;
所述物理资源块的大小为符号数为 7子载波数为 18时,所述导频位置图 样是从所述符号数为 6子载波数为 18的物理资源块对应的导频位置图样的符 号末尾处增加一不包含导频的符号后得到的导频位置图样。
10、 如权利要求 7、 8或 9所述的基站, 其特征在于,
所述导频位置确定模块, 还用于在所述导频信号发射模块釆用多天线发 射时, 确定第一个天线的导频位置图样后, 其它天线的导频位置图样中导频 位置与第一个天线的导频图样中的导频位置相邻。
11、 如权利要求 7、 8或 9所述的基站, 其特征在于,
所述导频位置确定模块, 还用于在多毫微微小区协作情况下, 确定第一 个毫微微小区的导频位置图样后, 其它毫微微小区的导频位置图样中导频位 置与第一个毫微微小区的导频图样中的导频位置相邻。
12、 如权利要求 7、 8或 9所述的基站, 其特征在于,
所述导频位置确定模块, 用于确定毫 微小区导频在一个物理资源块中 的个数后, 确定多个不同的导频位置图样;
所述导频信号发射模块, 还用于在发射每帧数据中釆用相同的导频位置 图样; 或者, 釆用跳频方式发射, 以 N帧为单位釆用不同的导频位置图样, N为大于等于 1的整数。
13、 如权利要求 12所述的基站, 其特征在于, 还包括与导频位置确定 模块相连的导频位置图样通知模块;
所述导频位置图样通知模块, 用于在所述导频信号发射模块发射每帧数 据时釆用相同的导频位置图样时, 通过广播信道将此导频位置图样通知给毫 微微小区移动终端; 还用于在所述导频信号发射模块釆用跳频方式发射, 以
N帧为单位釆用不同的导频位置图样时, 通过广播信道将导频位置图样以及 导频位置图样的跳频发射顺序通知给毫微微小区移动终端。
14、 一种实现毫微微小区导频分配的移动终端, 其特征在于, 包括导频 位置解析模块和导频信号发射模块;
所述导频位置解析模块, 用于从毫微微小区基站接收导频位置图样从中 解析出毫微微小区导频在一个物理资源块中的个数和位置;
所述导频信号发射模块, 用于在所述导频位置图样指示的导频位置上发 送导频信号, 所述导频位置是宏小区导频在物理资源块中导频所占位置的一 个或多个。
15、 如权利要求 14所述的移动终端, 其特征在于,
所述物理资源块的大小为符号数为 6子载波数为 18时,所述导频位置图 样中导频的位置是下述位置中一个或多个: 符号 0子载波 8, 符号 1子载波 16, 符号 2子载波 0, 符号 3子载波 8, 符号 4子载波 16, 符号 5子载波 0。
16、 如权利要求 14所述的移动终端, 其特征在于,
所述物理资源块的大小为符号数为 5子载波数为 18时,所述导频位置图 样是从所述符号数为 6子载波数为 18的物理资源块对应的导频位置图样中删 除一不包含导频的符号后得到的导频位置图样; 所述物理资源块的大小为符号数为 7子载波数为 18时,所述导频位置图 样是从所述符号数为 6子载波数为 18的物理资源块对应的导频位置图样的符 号末尾处增加一不包含导频的符号后得到的导频位置图样。
17、 如权利要求 14、 15或 16所述的移动终端, 其特征在于, 所述导频信号发射模块, 还用于所述导频位置解析模块从所述毫微微小 区接收到一导频位置图样时, 发射每帧数据时均釆用此导频位置图样; 还用 于在所述导频位置解析模块从所述毫微微小区接收到多个导频位置图样以及 导频位置图样的跳频发射顺序时, 以此多个导频位置图样的跳频发射顺序跳 频方式发射导频信号。
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