CN101197653A - Wireless communication device and wireless communication method - Google Patents
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Abstract
本发明提供一种无线通信装置以及无线通信方法,其可提供小区间干扰小的通信信道、并且抑制小区间干扰的变动量。一种基站,其配置在无线通信系统中,该无线通信系统将频分复用方式用作调制方式来实现频分多址,将小区分割为内侧区域和外侧区域,该基站具有分配控制部(30),该控制部用于在小区的外侧区域通过完全正交信道来进行子信道化,在小区的内侧区域通过准正交信道来进行子信道化。
The present invention provides a radio communication device and a radio communication method capable of providing a communication channel with little inter-cell interference and suppressing fluctuations in inter-cell interference. A base station disposed in a wireless communication system that implements frequency division multiple access using a frequency division multiplexing method as a modulation method, divides a cell into an inner area and an outer area, and has an allocation control unit ( 30) The control unit is configured to perform sub-channelization through a completely orthogonal channel in an outer area of the cell, and perform sub-channelization through a quasi-orthogonal channel in an inner area of the cell.
Description
技术领域technical field
本发明涉及一种无线通信装置以及无线通信方法。The present invention relates to a wireless communication device and a wireless communication method.
背景技术Background technique
目前,已知使用了FDMA(Frequency Division Multiple Access)等频分多址方式的无线通信系统。尤其,近年来使用了OFDMA(Orthogonal FrequencyDivision Multiple Access)等正交频分多址方式的无线通信系统引人瞩目。Conventionally, wireless communication systems using a frequency division multiple access method such as FDMA (Frequency Division Multiple Access) are known. In particular, wireless communication systems using orthogonal frequency division multiple access methods such as OFDMA (Orthogonal Frequency Division Multiple Access) have attracted attention in recent years.
在使用了这样的正交频分多址方式的无线通信系统中,在存在相邻的3个小区时,已知例如在各小区1至3中使用相同频带(fMHz)的结构(参照图18)和将某一频带(fMHz)逻辑地分割为3段并将分割后的各频带(f/3MHz)分配给各小区1至3的结构(参照图19)。In a radio communication system using such an OFDMA scheme, when there are three adjacent cells, for example, a configuration is known in which the same frequency band (fMHz) is used in each of the
在前者的结构(参照图18)中,存在如下问题:由于多个小区1至3使用某一频带整体,因此在来自其他小区的干扰较小时可以实现高吞吐量,但是由于相邻小区也使用相同频带,因此小区间干扰变大,对位于小区端部的移动终端(用户)无法提供足够的通信品质(传输速率或呼损率等)。In the former structure (refer to FIG. 18 ), there is a problem that since a plurality of
另一方面,在后者的结构(参照图19)中,存在如下问题:由于在相邻小区之间使用不同的频带,因此容易抑制小区间干扰,但是由于将某一频带分割为3段,因此可达到的峰值吞吐量的上限为使用该频带整体时的1/3,在小区间通信量不均匀时不能充分利用无线资源。On the other hand, in the latter configuration (see FIG. 19 ), there is a problem that since different frequency bands are used between adjacent cells, it is easy to suppress inter-cell interference, but since a certain frequency band is divided into three segments, Therefore, the upper limit of the achievable peak throughput is 1/3 of that when using the entire frequency band, and radio resources cannot be fully utilized when the traffic between cells is uneven.
因此,提出了如下结构(参照专利文献1):如图20所示,将各小区分割为外侧区域和内侧区域,对来自其他小区的干扰小的内侧区域分配在多个小区共同使用的频带F4,对来自其他小区的干扰大的外侧区域分配分别在各小区使用的频带F1至F3。Therefore, a configuration has been proposed (see Patent Document 1) in which each cell is divided into an outer area and an inner area as shown in FIG. , the frequency bands F1 to F3 respectively used in each cell are allocated to the outside area where interference from other cells is large.
【专利文献1】特开2005-80286号公报[Patent Document 1] JP-A-2005-80286
发明内容Contents of the invention
在上述现有技术中,由于以语音通信为对象,因此小区间干扰的时间变动比较平缓。In the prior art described above, since voice communication is targeted, the inter-cell interference has a relatively gentle temporal variation.
然而,在数据通信中存在如下特征:通信量的性质方面,尤其在一对一的链路上断断续续发送较短的分组,因此给予周围的干扰的变动量变大。However, there is a characteristic in data communication that, in terms of the nature of communication traffic, short packets are intermittently transmitted on a one-to-one link in particular, and thus the amount of fluctuation in interference to the surroundings becomes large.
另一方面,存在如下问题:在数据通信中尽管具有可以进行重发处理的特征,但由于根据数据发送时刻之前的干扰量来决定发送功率或MCS(Modulation coding sets),所以干扰量的变动量大的状况并不理想。On the other hand, there is a problem that although data communication has the feature of being able to perform retransmission processing, since the transmission power or MCS (Modulation coding sets) is determined according to the interference amount before the data transmission time, the fluctuation amount of the interference amount The big picture isn't ideal.
而且,在假定利用OFDMA方式时,在同一无线通信系统的同一频带内能够实现在FDMA方式中无法实现的“完全正交信道(后述)”以及“准正交信道(后述)”双方。Furthermore, assuming that the OFDMA method is used, both "perfectly orthogonal channels (described below)" and "quasi-orthogonal channels (described below)" that cannot be realized in the FDMA method can be realized in the same frequency band of the same wireless communication system.
因此,本发明是鉴于上述课题而提出的发明,其目的在于提供一种无线通信装置以及无线通信方法,该无线通信装置以及无线通信方法可提供小区间干扰小的通信、并且能够抑制小区间干扰的变动量。Therefore, the present invention was made in view of the above problems, and an object of the present invention is to provide a wireless communication device and a wireless communication method capable of providing communication with little inter-cell interference and suppressing inter-cell interference. amount of change.
本发明的第一特征是,一种无线通信装置,其配置在无线通信系统中,该无线通信系统将频分复用方式用作调制方式来实现频分多址方式,并将小区分割为内侧区域和外侧区域,其中,具有分配控制部,该分配控制部分配完全正交信道来作为在所述外侧区域可使用的子信道,分配准正交信道来作为在所述内侧区域可使用的子信道,作为在相邻小区的外侧区域可使用的子信道而分配的所述完全正交信道中包含的子载波之间全部正交,作为在相邻小区的内侧区域可使用的子信道来分配的所述准正交信道中包含的子载波之间,一部分重复、一部分正交。A first feature of the present invention is a wireless communication device that is arranged in a wireless communication system that implements a frequency division multiple access method using a frequency division multiplexing method as a modulation method and divides a cell into inner an area and an outer area, wherein an allocation control unit is provided, and the allocation control section allocates a completely orthogonal channel as a sub-channel usable in the outer area, and allocates a quasi-orthogonal channel as a sub-channel usable in the inner area. All the subcarriers included in the completely orthogonal channel allocated as subchannels usable in the outer area of the adjacent cell are orthogonal to each other, and are allocated as subchannels usable in the inner area of the adjacent cell Among the subcarriers included in the quasi-orthogonal channel, some of them are repeated and some of them are orthogonal.
在本发明的第一特征中,所述分配控制部对期望波接收功率比预先设定的规定阈值低的移动终端分配在所述外侧区域可使用的子信道,对期望波接收功率比该规定阈值高的移动终端分配在所述内侧区域可使用的子信道。In the first aspect of the present invention, the allocation control unit allocates a subchannel usable in the outer area to a mobile terminal whose desired wave reception power is lower than a preset predetermined threshold value, and the desired wave reception power is lower than the predetermined threshold. Subchannels usable in the inner area are assigned to mobile terminals with a higher threshold.
在本发明的第一特征中,所述内侧区域被分为多个区域,所述分配控制部分配使用率分别不同的准正交信道来作为在分割而得的所述多个内侧区域可使用的子信道。In the first aspect of the present invention, the inner area is divided into a plurality of areas, and the allocation control unit allocates quasi-orthogonal channels with different usage rates as usable channels in the divided inner areas. sub-channel.
在本发明的第一特征中,所述分配控制部对位于各小区的外侧区域的移动终端,以由数据帧结构中至少一个完全正交信道和至少一个符号的组合而规定的突发分配模式,分配无线资源,所述突发分配模式在所有的小区间相同。In the first aspect of the present invention, the allocation control unit uses a burst allocation pattern specified by a combination of at least one completely orthogonal channel and at least one symbol in the data frame structure for mobile terminals located in the outer area of each cell. , allocate radio resources, and the burst allocation mode is the same among all the cells.
在本发明的第一特征中,所述分配控制部将切换呼叫分配给在所述外侧区域可使用的子信道。In the first aspect of the present invention, the allocation control unit allocates the switching call to the subchannel available in the outer area.
在本发明的第一特征中,所述内侧区域被分为多个区域,所述分配控制部将切换呼叫分配给在分割而得的该多个内侧区域中的一个区域中可使用的子信道。In the first aspect of the present invention, the inner area is divided into a plurality of areas, and the assignment control unit assigns the switching call to a subchannel usable in one of the divided inner areas. .
在本发明的第一特征中,所述分配控制部,将切换呼叫分配给在数据帧结构中与分配有前导码的区域近的区域。In the first aspect of the present invention, the allocation control unit allocates the handover call to an area close to an area to which the preamble is allocated in the data frame structure.
在本发明的第一特征中,所述分配控制部根据由移动终端通知的下行链路中的通信质量,对该移动终端分配在所述内侧区域或所述外侧区域中的某一个区域中可使用的子信道。In the first aspect of the present invention, the assignment control unit assigns the mobile terminal in either the inner area or the outer area based on the downlink communication quality notified by the mobile terminal. The subchannel to use.
在本发明的第一特征中,所述分配控制部对位于各小区的外侧区域的移动终端,以由数据帧结构中至少一个完全正交信道和至少一个符号的组合规定的突发分配模式,分配无线资源;所述分配控制部按照电波状况变更突发分配模式。In the first aspect of the present invention, the allocation control unit uses a burst allocation pattern specified by a combination of at least one completely orthogonal channel and at least one symbol in the data frame structure for mobile terminals located in the outer area of each cell, Allocating wireless resources; the allocation control unit changes the burst allocation mode according to radio wave conditions.
在本发明的第一特征中,所述分配控制部将至少一个报知信号分配给在所述外侧区域可使用的子信道。In the first aspect of the present invention, the allocation control unit allocates at least one notification signal to a subchannel usable in the outer area.
在本发明的第一特征中,所述分配控制部将在所述外侧区域可使用的子信道的一部分独占地分配给报知信号传输用。In the first aspect of the present invention, the allocation control unit exclusively allocates a part of the sub-channels usable in the outer area for notification signal transmission.
本发明的第二特征是,一种无线通信方法,该方法用于无线通信系统,该无线通信系统将频分复用方式用作调制方式来实现频分多址方式,并将小区分割为内侧区域和外侧区域,其中,具有如下步骤:无线通信装置分配完全正交信道来作为在所述外侧区域可使用的子信道,分配准正交信道来作为在所述内侧区域可使用的子信道,作为在相邻小区的外侧区域可使用的子信道而分配的所述完全正交信道中包含的子载波之间全部正交,作为在相邻小区的内侧区域可使用的子信道而分配的所述准正交信道中包含的子载波之间,一部分重复、一部分正交。A second feature of the present invention is a wireless communication method used in a wireless communication system that implements a frequency division multiple access method using a frequency division multiplexing method as a modulation method and divides a cell into inner an area and an outer area, wherein the wireless communication device allocates a completely orthogonal channel as a sub-channel usable in the outer area, and allocates a quasi-orthogonal channel as a sub-channel usable in the inner area, The subcarriers included in the completely orthogonal channels allocated as subchannels usable in the outer area of the adjacent cell are all orthogonal to each other, and all the subcarriers included in the channel allocated as the subchannel usable in the inner area of the adjacent cell are orthogonal to each other. Among the sub-carriers included in the quasi-orthogonal channel, some of them overlap and some of them are orthogonal.
附图说明Description of drawings
图1是第一至第九实施方式的基站的功能框图。FIG. 1 is a functional block diagram of a base station according to the first to ninth embodiments.
图2是在第一至第九实施方式的无线通信系统中使用的子载波以及子信道的概念的说明图。FIG. 2 is an explanatory diagram illustrating the concepts of subcarriers and subchannels used in the wireless communication systems of the first to ninth embodiments.
图3是在第一至第九实施方式的无线通信系统中使用的正交信道以及准正交信道的概念的说明图。FIG. 3 is an explanatory diagram illustrating the concepts of orthogonal channels and quasi-orthogonal channels used in the wireless communication systems of the first to ninth embodiments.
图4是在第一实施方式的无线通信系统中使用的数据帧结构的一例的说明图。FIG. 4 is an explanatory diagram of an example of a data frame structure used in the wireless communication system according to the first embodiment.
图5是在第二实施方式的无线通信系统中的子信道的分配方法的说明图。FIG. 5 is an explanatory diagram of a subchannel allocation method in the radio communication system according to the second embodiment.
图6是在第三实施方式的无线通信系统中使用的数据帧结构的一例的说明图。6 is an explanatory diagram of an example of a data frame structure used in the wireless communication system according to the third embodiment.
图7是表示第三实施方式的无线通信系统中的小区结构的一例的图。FIG. 7 is a diagram showing an example of a cell configuration in a radio communication system according to a third embodiment.
图8是表示在第三实施方式的无线通信系统中使用的突发分配模式的一例的图(其1)。FIG. 8 is a diagram (Part 1) showing an example of a burst allocation pattern used in the radio communication system according to the third embodiment.
图9是表示在第三实施方式的无线通信系统中使用的突发分配模式的一例的图(其2)。FIG. 9 is a diagram (part 2 ) showing an example of a burst allocation pattern used in the wireless communication system according to the third embodiment.
图10是第四实施方式的无线通信系统中的切换时的移动终端的动作的说明图。10 is an explanatory diagram of the operation of the mobile terminal during handover in the radio communication system according to the fourth embodiment.
图11是表示在第五实施方式的无线通信系统中使用的突发分配模式的一例的图(其1)。Fig. 11 is a diagram (part 1) showing an example of a burst allocation pattern used in the radio communication system according to the fifth embodiment.
图12是表示在第五实施方式的无线通信系统中使用的突发分配模式的一例的图(其2)。Fig. 12 is a diagram (Part 2) showing an example of a burst allocation pattern used in the wireless communication system according to the fifth embodiment.
图13是表示在第五实施方式的无线通信系统中使用的突发分配模式的一例的图(其3)。Fig. 13 is a diagram (Part 3) showing an example of a burst allocation pattern used in the wireless communication system according to the fifth embodiment.
图14是第七以及第八实施方式的无线通信系统的整体结构图。FIG. 14 is an overall configuration diagram of wireless communication systems according to seventh and eighth embodiments.
图15是在第七实施方式的无线通信系统中使用的数据帧结构的一例的说明图。FIG. 15 is an explanatory diagram of an example of a data frame structure used in the wireless communication system of the seventh embodiment.
图16是在第八实施方式的无线通信系统中使用的数据帧结构的一例的说明图。FIG. 16 is an explanatory diagram of an example of a data frame structure used in the wireless communication system according to the eighth embodiment.
图17是在第九实施方式的无线通信系统中使用的数据帧结构的一例的说明图。FIG. 17 is an explanatory diagram of an example of a data frame structure used in the radio communication system according to the ninth embodiment.
图18是现有的频带分配方法的说明图(其1)。FIG. 18 is an explanatory diagram (Part 1) of a conventional bandwidth allocation method.
图19是现有的频带分配方法的说明图(其2)。FIG. 19 is an explanatory diagram (Part 2) of a conventional bandwidth allocation method.
图20是现有的频带分配方法的说明图(其3)。符号说明FIG. 20 is an explanatory diagram (Part 3) of a conventional bandwidth allocation method. Symbol Description
11:符号映射部;12:分配部;13:IFFT;14:并/串转换部;15:保护区间插入部;16:DAC/RF电路;17:天线;21:天线;22:ADC/RF电路;23:保护区间除去部;24:并/串转换部;25:FFT;26:信号提取部;27:符号解映射部;30:分配控制部。11: Symbol mapping section; 12: Distribution section; 13: IFFT; 14: Parallel/serial conversion section; 15: Protection interval insertion section; 16: DAC/RF circuit; 17: Antenna; 21: Antenna; 22: ADC/RF circuit; 23: guard interval removal unit; 24: parallel/serial conversion unit; 25: FFT; 26: signal extraction unit; 27: symbol demapping unit; 30: distribution control unit.
具体实施方式Detailed ways
下面,参照附图对本发明的实施方式进行说明。在以下附图的记载中,对相同或类似的部分标注相同或类似的符号。但是,应注意的是附图是示意性的图。Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings below, the same or similar symbols are attached to the same or similar parts. However, it should be noted that the drawings are schematic diagrams.
(本发明的第一实施方式的无线通信系统)(The wireless communication system according to the first embodiment of the present invention)
本发明的第一实施方式的无线通信系统是将正交频分复用(OFDM)方式用作为调制方式的多用户通信系统。The wireless communication system according to the first embodiment of the present invention is a multi-user communication system using an orthogonal frequency division multiplexing (OFDM) method as a modulation method.
在本实施方式的无线通信系统中,通过将包含在一个通信路径的多个子载波的一部分分配给一个移动台(用户),来实现正交频分多址(OFDMA)方式。In the radio communication system according to this embodiment, an Orthogonal Frequency Division Multiple Access (OFDMA) scheme is implemented by allocating a part of a plurality of subcarriers included in one communication path to one mobile station (user).
另外,在本实施方式的无线通信系统中,如图20所示,一个小区被分为内侧区域和外侧区域。In addition, in the wireless communication system according to this embodiment, as shown in FIG. 20 , one cell is divided into an inner area and an outer area.
这里,在内侧区域,使用与相邻小区的内侧区域使用的频带相同的频带(在图20的例子中为F4),在外侧区域使用与相邻小区的外侧区域使用的频带不重复的频带(在图20的例子中,在小区1的外侧区域使用F1,在小区2的外侧区域使用F2,在小区3的外侧区域使用F3)。Here, in the inner area, use the same frequency band (F4 in the example of FIG. In the example of FIG. 20 , F1 is used in the outer area of
另外,在本实施方式的无线通信系统中,基站(无线通信装置)对多个移动终端分配在该基站属下的小区的外侧区域或内侧区域可使用的子信道。Also, in the radio communication system according to this embodiment, a base station (radio communication device) allocates subchannels usable in the outer area or inner area of a cell under the base station to a plurality of mobile terminals.
在本实施方式中,为了使容易理解,对子信道在频率方向正交时的例子进行说明,但是本发明并不限定于该例,也可以适用于子信道在时间方向正交时或子信道在时间方向和频率方向的组合上正交时的例子。In this embodiment, in order to make it easier to understand, an example in which the subchannels are orthogonal in the frequency direction is described, but the present invention is not limited to this example, and can also be applied to when the subchannels are orthogonal in the time direction or when the subchannels are orthogonal to each other. An example when it is orthogonal on a combination of the time direction and the frequency direction.
如图1所示,本实施方式的无线通信系统中的基站具有:符号映射部(symbol mapping)11、分配部12、IFFT13、并/串转换部14、保护(guard)区间插入部15、DAC/RF电路16、天线17、21、ADC/RF电路22、保护区间除去部23、并/串转换部24、FFT25、信号提取部26、符号解映射部(symboldemapping)27和分配控制部30。As shown in FIG. 1 , the base station in the wireless communication system according to this embodiment includes: a symbol mapping unit (symbol mapping) 11, an allocation unit 12, an IFFT 13, a parallel/serial conversion unit 14, a guard (guard) interval insertion unit 15, and a DAC. /RF circuit 16, antennas 17, 21, ADC/RF circuit 22, guard interval removal unit 23, parallel/serial conversion unit 24, FFT 25, signal extraction unit 26, symbol demapping unit (symboldemapping) 27 and allocation control unit 30.
符号映射部11根据应用的调制方式,将输入的发送信号序列(比特序列)映射到符号并进行输出。The symbol mapping unit 11 maps the input transmission signal sequence (bit sequence) to symbols according to the applied modulation scheme, and outputs the symbols.
分配部12按照来自分配控制部13的指示,将映射到从符号映射部11输入的符号的发送信序列分配给包含在“完全正交信道”或“准正交信道”中的(在频率轴上排列)子载波,然后进行输出。The allocating unit 12 allocates the transmission signal sequence mapped to the symbol input from the symbol mapping unit 11 to the (in the frequency axis Arranged above) subcarriers, and then output.
IFFT13输出如上所述地通过对从分配部12输入的多个子载波进行逆傅立叶变换而得到的时间信号(数字信号)。The IFFT 13 outputs time signals (digital signals) obtained by inverse Fourier transforming the plurality of subcarriers input from the allocating unit 12 as described above.
并/串转换部14对逆傅立叶变换后的时间信号(数字信号)进行并/串转换。The parallel/serial conversion unit 14 performs parallel/serial conversion on the inverse Fourier transformed time signal (digital signal).
保护区间插入部15对从并/串转换部14输入的时间信号(数字信号)插入保护间隔(guard interval)。The guard interval insertion unit 15 inserts a guard interval into the time signal (digital signal) input from the parallel/serial conversion unit 14 .
ADC/RF电路16将保护间隔插入后的时间信号(数字信号)转换成模拟信号后,将执行放大·变频等必要的模拟处理而得到的OFDM信号(模拟信号)通过天线17进行发送。The ADC/RF circuit 16 converts the guard interval-inserted time signal (digital signal) into an analog signal, and then transmits the OFDM signal (analog signal) obtained by performing necessary analog processing such as amplification and frequency conversion through the antenna 17 .
另一方面,在天线21接收到OFDM信号(模拟信号)时,ADC/RF电路22对接收到的OFDM信号(模拟信号)执行放大·变频等必要的模拟处理后转换成数字信号。On the other hand, when the antenna 21 receives an OFDM signal (analog signal), the ADC/RF circuit 22 converts the received OFDM signal (analog signal) into a digital signal after performing necessary analog processing such as amplification and frequency conversion.
保护区间除去部23从由ADC/RF电路22输入的数字信号除去保护间隔。The guard interval removal unit 23 removes a guard interval from the digital signal input from the ADC/RF circuit 22 .
并/串转换部24对保护间隔除去后的数字信号进行并/串转换。The parallel/serial conversion unit 24 performs parallel/serial conversion on the digital signal from which the guard interval has been removed.
FFT25对从并/串转换部24输入的数字信号进行傅立叶变换,由此取出各子载波。The FFT 25 performs Fourier transform on the digital signal input from the parallel/serial conversion unit 24 to extract each subcarrier.
信号提取部26按照来自分配控制部30的指示,从由FFT25输入的各子载波提取符号。The signal extraction unit 26 extracts a symbol from each subcarrier input from the FFT 25 in accordance with an instruction from the allocation control unit 30 .
符号解映射部27对由信号提取部26提取的符号进行解映射,由此得到接收信号序列。The symbol demapping unit 27 demaps the symbols extracted by the signal extracting unit 26 to obtain a received signal sequence.
分配控制部30分配“完全正交信道”作为在小区的外侧区域可使用的子信道,分配“准正交信道”作为在小区的内侧区域可使用的子信道。The allocation control unit 30 allocates "completely orthogonal channels" as subchannels usable in the outer area of the cell, and assigns "quasi-orthogonal channels" as subchannels usable in the inner area of the cell.
即,分配控制部30通过成为通信对象的移动终端位于小区的外侧区域或者内侧区域中的哪一方来控制子信道化的方法。That is, the allocation control unit 30 controls the sub-channelization method depending on whether the mobile terminal serving as a communication target is located in the outer area or the inner area of the cell.
具体而言,分配控制部30,在小区的外侧区域,通过完全正交信道来进行子信道化,在小区的内侧区域,进行基于准正交信道的子信道化。Specifically, the allocation control unit 30 performs sub-channelization using a complete orthogonal channel in the outer area of the cell, and performs sub-channelization based on a quasi-orthogonal channel in the inner area of the cell.
在这里,作为在相邻小区的外侧区域可使用的子信道而分配的“完全正交信道”中包含的子载波之间均正交。Here, the subcarriers included in the "perfectly orthogonal channel" allocated as subchannels usable in the outer area of the adjacent cell are all orthogonal to each other.
另外,作为在相邻小区的内侧区域可使用的子信道来分配的“准正交信道”中包含的子载波之间,一部分重复、一部分正交。In addition, some of the subcarriers included in the "quasi-orthogonal channel" allocated as subchannels usable in the inner area of the adjacent cell overlap and some of them are orthogonal to each other.
下面,举具体例对“完全正交信道”以及“准正交信道”进行说明。在本实施方式中,作为采用OFDMA方式的无线通信系统,以基于IEEE802.16的无线通信系统为例进行说明。但是,本发明并不限定于该无线通信系统,也可以适用于采用OFDMA方式的一般系统。Hereinafter, "perfectly orthogonal channels" and "quasi-orthogonal channels" will be described with specific examples. In this embodiment, a wireless communication system based on IEEE802.16 will be described as an example of a wireless communication system using the OFDMA method. However, the present invention is not limited to this wireless communication system, but can also be applied to a general system using OFDMA.
一般地,在采用OFDMA方式的无线通信系统中,由于一个频带由非常多的子载波(频率)构成,因此针对各个子载波控制“使哪个移动台(用户)使用(分配)”当考虑控制上的简易性和控制信号量时,效率并不高。Generally, in a wireless communication system employing the OFDMA method, since one frequency band consists of a very large number of subcarriers (frequencies), controlling "which mobile station (user) to use (assign)" for each subcarrier is considered in terms of control. The simplicity and efficiency of controlling semaphores are not high.
因此,在该无线通信系统中,将多个子载波(频率)组合而进行分组,以该组为单位进行对移动终端(用户)的无线资源(子载波)的分配。Therefore, in this radio communication system, a plurality of subcarriers (frequencies) are combined into groups, and radio resources (subcarriers) to mobile terminals (users) are assigned in units of the groups.
如图2所示,在IEEE802.16中,将如上组合了多个子载波(频率)而得的组称为“子信道”。As shown in FIG. 2 , in IEEE802.16, a group obtained by combining a plurality of subcarriers (frequencies) as described above is called a "subchannel".
并且,该子信道的组合模式由称为“IDcell”的参数来决定。And, the combination mode of the sub-channel is determined by a parameter called "IDcell".
在图2的例子中,当“IDcell=1”时,子信道1由子载波1、2、3构成,子信道2由子载波4、5、6构成,子信道3由子载波7、8、9构成。In the example in Figure 2, when "IDcell=1",
另外,当“IDcell=2”时,子信道1由子载波1、4、7构成,子信道2由子载波2、5、8构成,子信道3由子载波3、6、9构成。Also, when "IDcell=2",
在这里,在相邻小区A以及B中的“IDcell”相同的情况下,在对小区A属下的移动终端A以及小区B属下的移动终端B双方分配相同的子信道时,对移动终端A以及移动终端B分配的所有的子载波(频率)都相同。Here, when the "IDcell" in the adjacent cells A and B is the same, when the same subchannel is allocated to both the mobile terminal A under the cell A and the mobile terminal B under the cell B, the mobile terminal All subcarriers (frequencies) assigned to A and mobile terminal B are the same.
另一方面,在相邻小区A以及B中的“IDcell”相同的情况下,在对小区A属下的移动终端A以及小区B属下的移动终端B双方分配不同的子信道时,对移动终端A以及移动终端B分配的所有的子载波(频率)都不同。On the other hand, when the "IDcells" in adjacent cells A and B are the same, when different subchannels are assigned to both mobile terminal A under cell A and mobile terminal B under cell B, the mobile All subcarriers (frequencies) allocated to terminal A and mobile terminal B are different.
例如,如图3(a)所示,在相邻小区A以及B中的“IDcell”相同时,由于构成分配给小区A属下的移动终端A的子信道sc1的所有子载波(频率)与构成分配给小区B属下的移动终端B的子信道sc2的所有子载波(频率)完全正交,因此在该小区A以及B之间都表现为通过“完全正交信道”来进行子信道化。For example, as shown in FIG. 3(a), when the “IDcells” in adjacent cells A and B are the same, since all the subcarriers (frequencies) constituting the subchannel sc1 assigned to mobile terminal A under cell A are identical to All the subcarriers (frequencies) constituting the subchannel sc2 assigned to the mobile terminal B under the cell B are completely orthogonal, so both the cells A and B appear to perform subchannelization through a "completely orthogonal channel" .
即,在这种情况下,作为在相邻的小区A、B的外侧区域中可使用的子信道而分配的完全正交信道sc1、sc2中包含的子载波之间都正交。进而,子信道sc1和子信道sc2具有不同的子信道号码(即,SC1、SC2)。在如上述情况时,表现为子信道SC1相对于子信道SC2正交。That is, in this case, the subcarriers included in the complete orthogonal channels sc1 and sc2 allocated as subchannels usable in the outer regions of the adjacent cells A and B are all orthogonal to each other. Furthermore, the subchannel sc1 and the subchannel sc2 have different subchannel numbers (ie, SC1, SC2). In the above case, it appears that the sub-channel SC1 is orthogonal to the sub-channel SC2.
另一方面,如图3(b)所示,在相邻小区A以及B的“IDcell”不同时,即使对小区A属下的移动终端A分配的子信道sc1以及对小区B属下的移动终端B分配的子信道sc2不同时,分配给移动终端A以及移动终端B的子载波的一部分也会重复。On the other hand, as shown in FIG. 3(b), when the “IDcells” of adjacent cells A and B are different, even the subchannel sc1 assigned to mobile terminal A under cell A and the mobile terminal under cell B When the subchannel sc2 allocated to the terminal B is different, part of the subcarriers allocated to the mobile terminal A and the mobile terminal B overlap.
例如,在相邻小区A以及B的“IDcell”不同时,在小区A使用的子信道sc1中包含的子载波(频率)与在小区B中使用的子信道sc2中包含的子载波(频率)之间,一部分正交关系成立、而一部分重复关系成立,因此将两者称为“准正交”。For example, when the "IDcells" of adjacent cells A and B are different, the subcarriers (frequency) included in subchannel sc1 used in cell A and the subcarriers (frequency) included in subchannel sc2 used in cell B Among them, some orthogonal relations are established, while some repetitive relations are established, so the two are called "quasi-orthogonal".
即,作为在相邻小区A、B的内侧区域中可使用的子信道而分配的准正交信道sc1、sc2中包含的子载波之间,一部分重复、一部分正交。在如上述情况时,表现为子信道sc1相对于子信道sc2准正交That is, some of the subcarriers included in the quasi-orthogonal channels sc1 and sc2 allocated as subchannels usable in the inner regions of the adjacent cells A and B overlap and some of them are orthogonal. In the case of the above, it appears that the sub-channel sc1 is quasi-orthogonal to the sub-channel sc2
另外,如图4所示分配控制部30将在小区的外侧区域中可使用的各子信道(完全正交信道)作为各小区中的专用信道来进行分配。In addition, as shown in FIG. 4 , the allocation control unit 30 allocates each sub-channel (perfect orthogonal channel) usable in the outer area of the cell as a dedicated channel in each cell.
如图4所示,例如分配控制部30能够以如下方式构筑数据帧结构:在分配了前导码(preamble)的区域保存位于小区外侧区域的移动终端的信息,在下一个区域保存位于小区内侧区域的移动终端的信息。As shown in FIG. 4 , for example, the allocation control unit 30 can construct a data frame structure in such a manner that the information of the mobile terminals located in the area outside the cell is stored in the area to which the preamble is allocated, and the information of the mobile terminals located in the area inside the cell is stored in the next area. Information about mobile terminals.
并且,分配控制部30,能够分配与相邻小区不同的“IDcell”所对应的子信道作为在小区的内侧区域可使用的子信道,能够分配在与相邻小区相同的“IDcell”所对应的子信道中的、分配给自小区的子信道作为在小区的外侧区域可使用的子信道。In addition, the allocation control unit 30 can allocate a subchannel corresponding to an "IDcell" different from that of the adjacent cell as a subchannel usable in the inner area of the cell, and can allocate a subchannel corresponding to the same "IDcell" as the adjacent cell. Among the subchannels, the subchannel allocated to the own cell is a subchannel usable in the outer area of the cell.
在这里,分配控制部30改变作为在小区的外侧区域或内侧区域可使用的子信道而分配的子信道,例如,可以对期望波接收功率比预先设定的规定阈值低的移动终端分配在外侧区域可使用的子信道,对期望波接收功率比该规定阈值高的移动终端分配在内侧区域可使用的子信道。Here, the allocation control unit 30 changes the subchannels allocated as subchannels usable in the outer area or inner area of the cell. For example, the outer channel may be allocated to a mobile terminal whose desired wave reception power is lower than a predetermined threshold value set in advance. Subchannels usable in the area are assigned subchannels usable in the inner area to mobile terminals whose desired wave reception power is higher than the predetermined threshold.
根据第一实施方式的基站,在小区的外侧区域通过完全正交信道来进行子信道化,在小区的内侧区域进行基于准正交信道的子信道化。According to the base station of the first embodiment, the sub-channelization is performed by the complete orthogonal channel in the outer area of the cell, and the sub-channelization by the quasi-orthogonal channel is performed in the inner area of the cell.
这样,通过将各小区做成双重结构,在小区的外侧区域能够提供小区间干扰小的通信,在小区的内侧区域可以构成适宜选择MCS的状况。In this way, by making each cell a dual structure, it is possible to provide communication with less inter-cell interference in the outer area of the cell, and it is possible to form a situation in which the MCS is appropriately selected in the inner area of the cell.
在小区的外侧区域,能够提供小区间干扰小的通信是因为利用了完全正交信道、以及对这些子信道设定适当的再利用距离。In the outer area of the cell, communication with less inter-cell interference can be provided because completely orthogonal channels are used and appropriate reuse distances are set for these sub-channels.
另一方面,在小区的内侧区域,能够构成适宜选择MSC的状况的理由如下。On the other hand, in the inner area of the cell, the reason why it is possible to form a situation in which an MSC is suitable for selection is as follows.
以往,基站基于发送时刻以前的干扰量来决定发送功率或MCS,因此干扰量的变动大的状况并不理想。Conventionally, the base station determines the transmission power or the MCS based on the interference amount before the transmission time. Therefore, it is not preferable that the interference amount fluctuates greatly.
在对位于小区的内侧区域的移动终端分配完全正交信道时,根据在相邻小区是否使用相同子信道,进一步根据使用该子信道的位置(尤其上行链路),来预想该移动终端中的被干扰量的变动大。When allocating a completely orthogonal channel to a mobile terminal located in the inner area of a cell, it is expected that the mobile terminal will use the same sub-channel according to whether the same sub-channel is used in the adjacent cell, and further according to the position (especially uplink) of the sub-channel used. The amount of interference varies greatly.
另一方面,在对位于小区的内侧区域的移动终端分配准正交信道时,成为从相邻小区中使用的子信道每次受到较少的干扰,因此该移动终端中的被干扰量整体变动量变小,能够使MCS高效率地动作。On the other hand, when a quasi-orthogonal channel is assigned to a mobile terminal located in the inner area of a cell, the subchannels used in the adjacent cell receive less interference each time, so the amount of interference in the mobile terminal as a whole fluctuates. The amount becomes small, enabling the MCS to operate efficiently.
而且,在相邻小区使用的子信道之间不正交的情况下,与在相邻小区使用的子信道之间正交的情况相比,各移动终端中的被干扰量变大。Furthermore, when the subchannels used by adjacent cells are not orthogonal to each other, the amount of interference in each mobile terminal becomes larger than when the subchannels used by adjacent cells are orthogonal.
因此,根据本实施方式的基站,通过使在相邻小区间的边界使用的子信道之间相互正交(分配完全正交信道作为在相邻小区间的边界可使用的子信道),可以确保干扰量非常小的子信道,对与基站的距离远的移动终端或室内等的接收功率小的移动终端也能够提供良好的通信。Therefore, according to the base station of this embodiment, by making the subchannels used at the boundary between adjacent cells orthogonal to each other (allocating completely orthogonal channels as subchannels usable at the boundary between adjacent cells), it is possible to ensure A subchannel with a very small amount of interference can provide good communication even for a mobile terminal at a long distance from a base station or a mobile terminal with low reception power such as indoors.
另外,根据本实施方式的基站,对于期望波接收功率比预先设定的规定阈值低的移动终端分配在小区的外侧区域可使用的子信道,对期望波接收功率比该规定阈值高的移动终端分配在小区的内侧区域可使用的子信道。In addition, according to the base station of this embodiment, subchannels that can be used in the outer area of the cell are assigned to mobile terminals whose desired wave received power is lower than a preset predetermined threshold, and mobile terminals whose desired wave received power is higher than the predetermined threshold Subchannels usable in the inner area of the cell are allocated.
通过进行这样的子信道的分配,可以得到以下效果。By assigning such subchannels, the following effects can be obtained.
在整个小区的整个区域,与使用完全正交信道进行通信的情况相比,相邻小区中的特定子信道的使用的开始或结束对位于小区的内侧区域的移动终端受到的小区间干扰量的变动产生的影响不大,因此可以容易预料干扰量的变动量。In the entire area of the entire cell, the start or end of the use of a specific subchannel in an adjacent cell affects the amount of inter-cell interference received by a mobile terminal located in the inner area of the cell compared to the case of using a completely orthogonal channel for communication. Since the influence of the fluctuation is not large, the fluctuation amount of the disturbance amount can be easily predicted.
在数据通信中,根据小区间干扰量的估计量进行发送功率的控制或MCS的选择,因此可以更准确地估计小区间干扰量,由此可以想象到这些控制更高效地工作、且能够得到较高的系统吞吐量。In data communication, since the control of transmission power or the selection of MCS is performed based on the estimated amount of inter-cell interference, it is possible to estimate the amount of inter-cell interference more accurately, and it is conceivable that these controls work more efficiently and can be obtained more efficiently. High system throughput.
另一方面,在整个小区的整个区域,与使用准正交信道进行通信的情况相比,在小区的外侧区域使用完全正交信道的情况下,能够提供小区间干扰小的通信,尤其可以降低对位于小区端部的移动终端的停机率(outage rate)。On the other hand, in the entire area of the entire cell, compared with the case of using quasi-orthogonal channels for communication, in the case of using a completely orthogonal channel in the outer area of the cell, it is possible to provide communication with little inter-cell interference, and especially reduce The outage rate for mobile terminals located at the end of the cell.
另外,根据本实施方式的基站,不是简单地并用完全正交信道和准正交信道,而是根据这些被称为“再用分割(reuse partitioning)”的概念,缩短在小区内可使用的子信道的实质性的再利用距离,由此可以实现较高的系统吞吐量。In addition, according to the base station of this embodiment, instead of simply using the perfect orthogonal channel and the quasi-orthogonal channel together, the number of sub-channels available in the cell is shortened based on these concepts called "reuse partitioning". Substantial reuse distance of the channel, thereby enabling higher system throughput.
(第二实施方式)(second embodiment)
下面,对于本实施方式的无线通信系统,以与上述第一实施方式的无线通信系统的不同点为主进行说明。Hereinafter, the wireless communication system according to this embodiment will be described focusing on differences from the wireless communication system according to the first embodiment described above.
在本发明的第二实施方式中,如图5所示,小区的内侧区域被分为多个区域,分配控制部30分配使用率不同的准正交信道来作为在分割的多个内侧区域可使用的子信道。In the second embodiment of the present invention, as shown in FIG. 5 , the inner area of the cell is divided into a plurality of areas, and the allocation control unit 30 allocates quasi-orthogonal channels with different usage rates as the channels available in the divided inner areas. The subchannel to use.
此时,分配控制部30将利用使用率高的准正交信道的区域作为利用使用率低的准正交信道的区域的内侧。At this time, the allocation control unit 30 sets the area using the quasi-orthogonal channel with a high usage rate inside the area using the quasi-orthogonal channel with a low usage rate.
在图5的例子中,分配控制部30分配使用率为60%的准正交信道作为在内侧区域B可使用的子信道,分配使用率为90%的准正交信道作为在内侧区域A可使用的子信道。In the example of FIG. 5 , the allocation control unit 30 allocates a quasi-orthogonal channel with a usage rate of 60% as a sub-channel available in the inner area B, and allocates a quasi-orthogonal channel with a usage rate of 90% as a sub-channel available in the inner area A. The subchannel to use.
例如,分配控制部30可以对接收功率更高的移动终端分配使用率高的准正交信道。For example, the assignment control unit 30 may assign quasi-orthogonal channels with high usage rates to mobile terminals with higher received power.
通过如此构成,在各小区高效率地利用使用率高的准正交信道,可以达到高系统吞吐量。With such a configuration, high system throughput can be achieved by efficiently using quasi-orthogonal channels with high usage rates in each cell.
另外,分配控制部30可以适应性地变更在各区域可使用的准正交信道的使用率。In addition, the assignment control unit 30 can adaptively change the usage rate of quasi-orthogonal channels available in each area.
例如,分配控制部30对在各区域可使用的准正交信道的使用率,可以根据利用同一频带的周围小区的阻塞(blocking)率来决定,也可以根据周围小区的设定值和测定的观测信息进行决定以使区域吞吐量最大。For example, the utilization rate of the quasi-orthogonal channels available in each area by the allocation control unit 30 may be determined based on the blocking (blocking) rate of surrounding cells using the same frequency band, or may be determined based on the setting values of the surrounding cells and the measured Observation information is used to make decisions to maximize area throughput.
另外,分配控制部30也可以设定再利用距离不同的多个完全正交信道。In addition, the assignment control unit 30 may set a plurality of completely orthogonal channels with different reuse distances.
(第三实施方式)(third embodiment)
下面,对本实施方式的无线通信系统,以与上述第一以及第二实施方式的无线通信系统的不同点为主进行说明。Hereinafter, the radio communication system of this embodiment will be described mainly in terms of differences from the radio communication systems of the above-mentioned first and second embodiments.
如上所述,在第一以及第二实施方式中,分配控制部30固定地分配在各小区的外侧区域可使用的子信道。As described above, in the first and second embodiments, the allocation control unit 30 fixedly allocates subchannels usable in the outer area of each cell.
在这种情况下,可以通过简单的控制来运用,但是在某一小区通信量少、未使用的子信道多,且在相邻小区通信量多、子信道不足的情况下,尽管通过使其他小区能够使用这些未使用的子信道能够达到更高的系统吞吐量,但是通过限制无线资源为必要以上,可能存在在通信量高的小区出现多个无法实现充分的传输速度的移动终端。In this case, it can be used through simple control, but in the case of low traffic in a certain cell and many unused sub-channels, and in the case of high traffic in adjacent cells and insufficient sub-channels, even by making other Cells can use these unused sub-channels to achieve higher system throughput, but by limiting radio resources to more than necessary, there may be many mobile terminals that cannot achieve sufficient transmission speed in cells with high traffic.
另一方面,当允许这些子信道在其他小区的使用时,在位于小区端部的移动终端想要进行通信的情况下,由于来自其他小区的干扰,有可能无法使用该子信道。On the other hand, when these subchannels are allowed to be used in other cells, when a mobile terminal located at the end of the cell attempts to communicate, the subchannels may not be able to be used due to interference from other cells.
因此,在不影响位于小区端部的移动终端的停机率的范围内,优选使多个小区间共享准专用信道。Therefore, it is preferable to share quasi-dedicated channels among a plurality of cells within a range that does not affect the outage rate of mobile terminals located at cell ends.
因此,在第三实施方式中,分配控制部30在分配完全正交信道来作为在各小区可使用的子信道时,如图6所示,分类成专用信道和准专用信道来进行分配。Therefore, in the third embodiment, when allocating perfect orthogonal channels as subchannels usable in each cell, the allocation control unit 30 classifies them into dedicated channels and quasi-dedicated channels as shown in FIG. 6 and allocates them.
这里,专用信道是在各小区专门分配的子信道,准专用信道是在一定条件下在多个小区共享的子信道。Here, a dedicated channel is a subchannel specially assigned to each cell, and a quasi-dedicated channel is a subchannel shared by multiple cells under certain conditions.
具体而言,在各小区分配控制部30作为原则按照“作为在其他小区可使用的子信道(完全正交信道)而分配的准专用信道”、“作为在自小区可使用的子信道(完全正交信道)而分配的准专用信道”、“作为在自小区可使用的子信道(完全正交信道)而分配的专用信道”的优先顺序,对移动终端进行子信道的分配。Specifically, in principle, the allocation control unit 30 in each cell follows "a quasi-dedicated channel allocated as a subchannel (completely orthogonal channel) usable in other cells" and "a subchannel (completely orthogonal channel) allocated as a Sub-channels are allocated to mobile terminals in order of priority of "quasi-dedicated channels allocated as sub-channels (perfectly-orthogonal channels) available in the own cell" and "dedicated channels allocated as sub-channels (completely-orthogonal channels) available in the own cell".
然后,分配控制部30,在对移动终端分配了所有“作为在自小区可使用的子信道(完全正交信道)而分配的专用信道”的情况下,禁止其他小区使用“作为在自小区可使用的子信道(完全正交信道)而分配的准专用信道”。Then, when all the "dedicated channels allocated as subchannels (completely orthogonal channels) usable in the own cell" are allocated to the mobile terminal, the allocation control unit 30 prohibits other cells from using the quasi-dedicated channels allocated for the sub-channels used (completely orthogonal channels).
结果,导致各小区中的阻塞率的下降。As a result, a decrease in the blocking rate in each cell is caused.
图7表示,在各小区分配控制部30分配“专用信道”以及“准专用信道”的例子。在图7的例子中,分配控制部30分配不同的“专用信道”以及“准专用信道”来作为在相邻小区可使用的子信道(完全正交信道)。FIG. 7 shows an example in which "dedicated channels" and "quasi-dedicated channels" are allocated by the cell allocation control unit 30. In FIG. In the example of FIG. 7 , the allocation control unit 30 allocates different "dedicated channels" and "quasi-dedicated channels" as subchannels (perfectly orthogonal channels) usable in adjacent cells.
另外,分配控制部30可以通过有线网络进行准专用信道的使用许可以及禁止。In addition, the allocation control unit 30 can perform the permission and prohibition of the use of the quasi-dedicated channel through the wired network.
而且,分配控制部30也可以从作为在完全正交信道的通信量负荷低的小区可使用的子信道而分配的准专用信道起按照顺序进行分配。Furthermore, the allocation control unit 30 may allocate in order from quasi-dedicated channels allocated as sub-channels that can be used in cells with a low traffic load of the perfect orthogonal channel.
在这里,分配控制部30也可以通过有线网络掌握该通信量负荷。Here, the allocation control unit 30 may grasp the traffic load through a wired network.
而且,分配控制部30,也可以提高在其他小区的“准专用信道”的分配阈值作为“准专用信道”以及“专用信道”的运用方法。Furthermore, the allocation control unit 30 may increase the allocation threshold value of the "quasi-dedicated channel" in another cell as the operation method of the "quasi-dedicated channel" and the "dedicated channel".
在这里,分配控制部30,作为分配“准专用信道”的基准,也可以使用接收功率相对于准专用信道整体的干扰电平的比。Here, the allocation control unit 30 may use the ratio of received power to the interference level of the entire quasi-dedicated channel as a reference for allocating the "quasi-dedicated channel".
或者,分配控制部30也可以根据小区1中的专用信道中的干扰电平决定小区1中的准专用信道的分配阈值。Alternatively, the allocation control unit 30 may determine the allocation threshold of the quasi-dedicated channel in the
而且,分配控制部30也可对每一数据帧监视状况,在发生超过该分配阈值的状况时,不分配“准专用信道”(不是一旦分配了“准专用信道”就一直继续使用)。Moreover, the allocation control unit 30 may monitor the situation for each data frame, and when a situation exceeding the allocation threshold occurs, the "quasi-dedicated channel" is not allocated (the "quasi-dedicated channel" does not continue to be used once allocated).
结果,在自小区中,在通信量负荷较低时,分配控制部30以作为在通信量负荷高的小区可使用的子信道的方式分配“准专用信道”,在各小区中的通信量负荷上升时,小区间干扰电平上升,成为在各小区难以使用“准专用信道”的状况,该“准专用信道”是作为在其他小区可使用的子信道而分配的信道。As a result, in the own cell, when the traffic load is low, the allocation control unit 30 allocates a "quasi-dedicated channel" as a sub-channel usable in a cell with a high traffic load, and the traffic load in each cell When it increases, the inter-cell interference level increases, making it difficult for each cell to use a "quasi-dedicated channel" allocated as a sub-channel usable by other cells.
另外,在IEEE802.16中规定的下行链路中,如图8所示,分配控制部30对于位于各小区的移动终端,以突发(burst)分配模式(pattern)分配无线资源,该突发分配模式是由在数据帧结构中至少一个子信道(子信道号码)和至少一个符号(OFDM符号号码、相当于子信道的分配时间)的组合规定的。Also, in the downlink specified in IEEE802.16, as shown in FIG. 8 , the allocation control unit 30 allocates radio resources in a burst allocation pattern to mobile terminals located in each cell. The allocation pattern is defined by a combination of at least one subchannel (subchannel number) and at least one symbol (OFDM symbol number, corresponding to the allocation time of the subchannel) in the data frame structure.
将这样的向移动终端的无线资源的分配单位称为“突发”。在作为各小区中可使用的子信道分配“准专用信道”时,该突发分配模式在所有小区间都相同。Such a unit of allocation of radio resources to mobile terminals is called a "burst". When a "quasi-dedicated channel" is allocated as a subchannel usable in each cell, this burst allocation pattern is the same among all cells.
这是由于如图9(a)所示在所有小区间在突发分配模式没有统一时,以子信道为单位实现正交化,以突发单位看不能保证在相邻小区可使用的子信道之间能够实现正交化。This is because, as shown in Figure 9(a), when the burst allocation mode is not unified among all cells, orthogonalization is realized in units of sub-channels, and the sub-channels usable in adjacent cells cannot be guaranteed in terms of burst units Orthogonality can be achieved between them.
另一方面如图9(b)所示在所有小区间在突发分配模式统一时,以突发单位看在相邻小区可使用的子信道之间正交。On the other hand, as shown in FIG. 9( b ), when the burst allocation pattern is unified among all cells, the subchannels usable by adjacent cells are orthogonal to each other in burst units.
(第四实施方式)(fourth embodiment)
下面,对于本实施方式的无线通信系统,以与上述第一至第三实施方式的无线通信系统的不同点为主进行说明。Hereinafter, the wireless communication system of this embodiment will be described mainly in terms of differences from the wireless communication systems of the first to third embodiments described above.
在上述第一至第三实施方式中,分配控制部30根据移动终端中的接收功率等,分配在小区的内侧区域或外侧区域的某一个区域中可使用的子信道。In the first to third embodiments described above, the allocation control unit 30 allocates subchannels that can be used in either the inner area or the outer area of the cell according to the received power in the mobile terminal or the like.
从概念上,这意味着分配控制部30按照小区中的移动终端的位置决定分配的子信道。Conceptually, this means that the allocation control unit 30 determines the subchannels to be allocated according to the position of the mobile terminal in the cell.
但是,正在收发切换呼叫的移动终端(高速移动的移动终端)的位置是时刻变化的。However, the position of a mobile terminal (a mobile terminal moving at high speed) that is transmitting and receiving a handover call changes momentarily.
因此,可以预料高速移动的移动终端自身受的干扰量和由于高速移动的移动终端的移动而对周围产生的干扰量对系统吞吐量的影响变大。Therefore, it is expected that the amount of interference received by the mobile terminal moving at high speed and the amount of interference generated around it due to the movement of the mobile terminal moving at high speed will greatly affect the system throughput.
因此,在本实施方式中,分配控制部30不仅利用移动终端中的接收功率,还利用有关移动终端的移动速度的信息,分配在小区的内侧区域或外侧区域的某区域可使用的子信道。Therefore, in the present embodiment, the assignment control unit 30 uses not only the received power of the mobile terminal but also information about the moving speed of the mobile terminal to allocate subchannels usable in either the inner area or the outer area of the cell.
下面,表示针对切换呼叫的子信道分配方法。这里,在切换呼叫中,除了包含由从小区外切换来的移动终端收发的呼叫,还包含由高速移动的移动终端收发的呼叫。Next, a subchannel allocation method for a handover call is shown. Here, the handover call includes not only a call sent and received by a mobile terminal handed over from outside the cell, but also a call sent and received by a mobile terminal moving at high speed.
另外,分配控制部30将切换呼叫分配给在小区的外侧区域可使用的子信道。In addition, the allocation control unit 30 allocates the handover call to a subchannel usable in the outer area of the cell.
如图10所示,关于在小区的内侧区域可使用的子信道,统计结果表示来自小区端部的干扰功率较大,因此若移动终端向小区端部移动时容易切换,子信道的切换的可能性较大。As shown in Figure 10, regarding the subchannels available in the inner area of the cell, the statistical results show that the interference power from the cell end is relatively large, so if the mobile terminal moves to the cell end, it is easy to switch, and the possibility of subchannel switching more sexual.
另外,子信道的切换需要子信道的搜索和控制信号的交换。In addition, subchannel switching requires subchannel search and exchange of control signals.
而且,若子信道的切换的频度高,则小区间干扰的变动激烈,难以预测干扰量。Furthermore, if the frequency of subchannel switching is high, inter-cell interference fluctuates rapidly, making it difficult to predict the amount of interference.
另外,尤其在上行链路中存在如下问题:由于对相邻小区中的小区附近的移动终端的干扰量增加,因此对吞吐量的下降产生的影响较大。In addition, particularly in the uplink, there is a problem in that the amount of interference to mobile terminals in the vicinity of adjacent cells increases, which greatly affects the decrease in throughput.
因此,在不设置切换呼叫专用的子信道时,分配控制部30优选将切换呼叫分配给在小区的外侧区域可使用的子信道。Therefore, when no subchannel dedicated to the handover call is provided, it is preferable that the allocation control unit 30 allocates the handover call to a subchannel usable in the outer area of the cell.
另外,也可以为:小区的内侧区域被分为多个区域,分配控制部30将切换呼叫分配给在分割而得的多个内侧区域中的一个区域中可使用的子信道。Alternatively, the inner area of the cell may be divided into a plurality of areas, and the allocation control unit 30 may allocate a handover call to a subchannel usable in one of the divided inner areas.
在这种情况下,分配控制部30在移动终端中的被干扰量或该移动终端对其他小区的干扰量超过预定阈值时,优选使用不依赖于在相邻小区的子信道的使用状况的准正交信道。In this case, the allocation control unit 30 preferably uses an allocation control unit 30 that does not depend on the usage status of subchannels in adjacent cells when the amount of interference in the mobile terminal or the amount of interference from the mobile terminal to other cells exceeds a predetermined threshold. Orthogonal channels.
在上述例子中,对于分配控制部30没有设置切换呼叫专用的子信道的方式进行了说明。在该方式中可容易进行控制。In the above-mentioned example, the mode in which the allocation control unit 30 does not provide a sub-channel dedicated to handover calls has been described. Control can be easily performed in this manner.
另一方面在上述例子中,由于分配控制部30对切换呼叫分配在小区的外侧区域可使用的子信道,因此例如在切换呼叫较多的情况下,有可能明显限制可提供给位于小区端部的移动终端的通信质量。On the other hand, in the above example, since the allocation control unit 30 allocates subchannels available in the outer area of the cell to the handover call, for example, in the case of many handover calls, the subchannels that can be provided to the end of the cell may be significantly limited. communication quality of the mobile terminal.
因此,考虑如下方法:将小区的内侧区域分为多个区域,并将分割的多个内侧区域的一部分区域中可使用的子信道用作为切换呼叫专用的子信道。Therefore, a method is considered in which the inner area of a cell is divided into a plurality of areas, and subchannels available in some of the divided inner areas are used as subchannels dedicated to handover calls.
但是,若将特定的子信道作为切换呼叫专用的子信道,则在不存在切换呼叫时,由于不能有效使用该子信道(无线资源),因此通常将该特定的子信道用作为使用率低的共享信道。However, if a specific sub-channel is used as a sub-channel dedicated to a handover call, since the sub-channel (radio resource) cannot be effectively used when there is no handover call, the specific sub-channel is usually used as a channel with a low usage rate. shared channel.
另外,分配控制部30也可以按照在自小区以及周边小区的切换呼叫的状况,使对切换呼叫分配该子信道的比率自适应地变动。In addition, the allocation control unit 30 may adaptively change the rate at which the subchannel is allocated to the handover call in accordance with the state of handover calls in the own cell and neighboring cells.
具体而言,分配控制部30进行控制,以使在切换呼叫较多的情况下,降低对切换呼叫以外分配该子信道的比率,在切换呼叫较少的情况下,提高对切换呼叫以外分配该子信道的比率。Specifically, the allocation control unit 30 controls so that when there are many switching calls, the ratio of allocating the subchannel to other than switching calls is reduced, and when there are few switching calls, the ratio of allocating the subchannel to other than switching calls is increased. subchannel ratio.
另外,分配控制部30也可以考虑各小区中的通信量而决定分配该子信道的比率。In addition, the allocation control unit 30 may determine the rate at which the sub-channel is allocated in consideration of the traffic in each cell.
另外,分配控制部30在设置了切换呼叫专用的子信道的情况下也对切换呼叫分配切换呼叫专用的子信道以外的子信道。In addition, the allocation control unit 30 also allocates sub-channels other than the sub-channels dedicated to the switching call to the switching call even when the sub-channel dedicated to the switching call is provided.
在这种情况下,分配控制部30也可以根据各小区的内侧区域中的当前的切换呼叫的占有率或切换呼叫的接收功率等来决定切换呼叫使用哪个子信道(切换呼叫专用的子信道或切换呼叫专用的子信道以外的子信道)。In this case, the allocation control unit 30 may determine which subchannel to use for the handover call (the subchannel dedicated to the handover call or switch sub-channels other than call-only sub-channels).
另外,在上述实施方式中,关于分配给切换呼叫的子信道的数据帧结构内的位置,原理上在哪个位置分配都不成工作上致命的问题。In addition, in the above-mentioned embodiment, regarding the position within the data frame structure of the subchannel allocated to the handover call, in principle, it does not matter which position is allocated to which operation is critical.
在WiMAX中,在分配数据帧结构的开头的前导码的区域以及分配数据的区域,分散配置已知信号。In WiMAX, known signals are scattered and arranged in an area allocated to a preamble at the top of a data frame structure and an area allocated to data.
然后,利用这些已知信号进行时间同步或频率同步的获得、或信道估计。Then, use these known signals to perform time synchronization or frequency synchronization acquisition, or channel estimation.
由于高速移动的移动终端相对于时间经过其信道变动快,因此认为在该移动终端中使用的无线资源(切换呼叫收发用无线资源(子信道以及OFDM符号))被分配到在时间上与分配有前导码的区域有距离的区域时,无法有效利用该前导码,容易导致接收质量的恶化。Since the channel of a mobile terminal moving at high speed fluctuates quickly with time, it is considered that the radio resources (radio resources (sub-channels and OFDM symbols) for handover call transmission and reception) used in the mobile terminal are allocated to a time-dependent channel. If the area of the preamble is a distant area, the preamble cannot be effectively used, and the reception quality is liable to deteriorate.
因此,在本实施方式中,分配控制部30如下所述地决定在数据帧结构中分配切换呼叫的区域。Therefore, in the present embodiment, the allocation control unit 30 determines an area in which a switching call is allocated in the data frame structure as follows.
例如,如图4所示,分配控制部30以如下方式构筑数据帧结构:在与分配有前导码的区域部连续的区域保存位于小区边界附近的移动终端以及正在进行切换的移动终端的信息,在接下来的连续的区域保存位于小区附近的移动终端的信息。For example, as shown in FIG. 4 , the allocation control unit 30 constructs a data frame structure in such a manner that information on mobile terminals located near cell boundaries and mobile terminals in handover is stored in an area continuous with the area to which the preamble is allocated, Information on mobile terminals located near the cell is stored in the next continuous area.
这样,在数据帧结构中,优选将切换呼叫分配给离分配有前导码的区域近的区域。In this way, in the data frame structure, it is preferable to allocate the handover call to an area close to the area to which the preamble is allocated.
由于高速移动的移动终端随着时间经过其信道变动大,因此由该移动终端可使用的无线资源(切换呼叫收发用无线资源)被分配到数据帧结构的后一部分时,由前导码估计的子信道与分配了切换呼叫的区域中的子信道之间的变化量大,难以有效利用使用了前导码的信道估计值。Since the channel of a mobile terminal moving at high speed fluctuates greatly over time, when the radio resource (radio resource for handover call transmission and reception) usable by the mobile terminal is allocated to the latter part of the data frame structure, the sub-band estimated from the preamble The amount of variation between the channel and the subchannel in the area to which the handover call is allocated is large, and it is difficult to effectively use the channel estimation value using the preamble.
另一方面,静止的移动终端随着时间经过其信道变动小,即使在由该移动终端可使用的无线资源被分配到数据帧结构中的后一区域时也可以有效利用前导码,可以求得信道估计值。On the other hand, a static mobile terminal has little channel variation over time, and the preamble can be effectively used even when the radio resource usable by the mobile terminal is allocated to the latter area in the data frame structure, and it can be obtained that channel estimate.
因此,将切换呼叫配置在离分配有前导码的区域近的区域,将在静止的移动终端(固定终端)中可使用的无线资源配置在其后面,由此所有移动终端可以得到信道估计精度高的信道估计值。Therefore, by placing handoff calls in an area close to the area to which the preamble is assigned, and placing radio resources usable by stationary mobile terminals (fixed terminals) behind it, all mobile terminals can obtain high-precision channel estimation. channel estimate.
(第五实施方式)(fifth embodiment)
下面,关于本实施方式的无线通信系统,以与上述第一至第四实施方式的无线通信系统的不同点为主进行说明。Hereinafter, the wireless communication system of this embodiment will be described mainly in terms of differences from the wireless communication systems of the above-mentioned first to fourth embodiments.
在上述第一至第四实施方式中,说明了各小区中的子信道的使用方法。在各小区中,通常复用由多个移动终端收发的通信。In the first to fourth embodiments described above, the method of using subchannels in each cell has been described. In each cell, communications transmitted and received by a plurality of mobile terminals are generally multiplexed.
在本发明的第五实施方式中,使用图11所示的基本例说明由多个移动终端收发的通信的复用方法。In the fifth embodiment of the present invention, a method of multiplexing communications transmitted and received by a plurality of mobile terminals will be described using the basic example shown in FIG. 11 .
作为第一个方法,如图11所示,分配控制部30也可以构筑如下数据帧结构:预先将大小固定,设置了分配在小区的外侧区域可使用的无线资源的区域A、分配在小区的内侧区域可使用的无线资源的区域B以及子区域C(为了减少对其他小区的干扰、并降低自小区中的子信道的使用率,而在该小区中无法使用的无线资源的区域)的数据帧结构。As a first method, as shown in FIG. 11 , the allocation control unit 30 may also construct the following data frame structure: the size is fixed in advance, and the area A for allocating radio resources usable in the outer area of the cell is set; Data of area B of radio resources available in the inner area and sub-area C (area of radio resources that cannot be used in this cell in order to reduce interference with other cells and reduce the usage rate of sub-channels in the own cell) frame structure.
在这种情况下,如图12所示,分配控制部30对位于各小区的移动终端,按照顺序确认是否可以通过突发分配模式1至4来分配无线资源(子信道以及OFDM符号),并按照最初可分配的突发分配模式来分配无线资源。In this case, as shown in FIG. 12 , the allocation control unit 30 checks in order whether radio resources (subchannels and OFDM symbols) can be allocated in
这里,分配控制部30根据各小区中的其他移动终端的使用状况、接收功率或SINR等来判断是否能分配无线资源。Here, the assignment control unit 30 judges whether radio resources can be assigned based on the use status, received power, SINR, etc. of other mobile terminals in each cell.
另外,在各小区中通信量少,无线资源的分配对象的移动终端要求非常高的传输速度等情况下,分配控制部30也可以通过多个突发分配模式来分配无线资源(对应于多个突发的无线资源)。In addition, when the amount of traffic in each cell is small, and the mobile terminal to which radio resources are allocated requires a very high transmission speed, the allocation control unit 30 may allocate radio resources in a plurality of burst allocation modes (corresponding to multiple bursty wireless resources).
此时,分配控制部30优选分配在数据帧结构内与连续的区域(突发)对应的无线资源。In this case, the allocation control unit 30 preferably allocates radio resources corresponding to continuous areas (bursts) within the data frame structure.
作为第二方法,如图13所示,分配控制部30也可以随着位于各小区的移动终端数的增加,构筑分割上述区域(突发)而使用的数据帧结构。As a second method, as shown in FIG. 13 , the allocation control unit 30 may construct a data frame structure for use by dividing the above-mentioned area (burst) as the number of mobile terminals located in each cell increases.
在这种情况下,分配控制部30决定对特定的移动终端分配的区域(突发)。In this case, the allocation control unit 30 determines an area (burst) to be allocated to a specific mobile terminal.
然后,分配控制部30,按照分配有与各区域对应的无线资源的移动终端数量均等地分割、或者按照由各移动终端要求的传输速度等来分割该区域(突发),分配与针对各移动终端分割的区域对应的无线资源。Then, the allocation control unit 30 divides the area (burst) equally according to the number of mobile terminals to which radio resources corresponding to each area are allocated, or according to the transmission rate requested by each mobile terminal, etc. The wireless resource corresponding to the area divided by the terminal.
在该分配方法中,尤其在分配有在小区的内侧区域中可使用的无线资源的区域为多个时,分配控制部30在决定分配在各移动终端中使用的无线资源的区域时,需要考虑其他小区内的移动终端的状况。In this allocation method, especially when there are multiple areas to which radio resources usable in the inner area of the cell are allocated, the allocation control unit 30 needs to consider Status of mobile terminals in other cells.
具体而言,分配控制部30也可以对各区域分配均等(或者规定的比率)的、在移动终端中使用的无线资源,将接收功率更大的移动终端或者(CINR-所需要质量)更高的移动终端中使用的无线资源分配给使用率高的区域。Specifically, the allocation control unit 30 may allocate equal (or predetermined ratio) radio resources used by mobile terminals to each area, and assign a mobile terminal with higher received power or a higher (CINR-required quality) The radio resources used in mobile terminals are allocated to areas with high usage rates.
此时,分配控制部30在各区域(突发)中,也可以预先决定一次可分配的最大复用移动终端数。At this time, the allocation control unit 30 may determine in advance the maximum number of multiplexed mobile terminals that can be allocated at one time in each area (burst).
(第六实施方式)(sixth embodiment)
下面,对于本实施方式的无线通信系统,以与上述的第一至第五实施方式的无线通信系统的不同点为主进行说明。Hereinafter, the wireless communication system of this embodiment will be described mainly in terms of differences from the wireless communication systems of the above-mentioned first to fifth embodiments.
在上述第一至第五实施方式中,在下行链路中,由于接收端为移动终端,因此基站无法直接观测SINR(尤其干扰量)。In the above-mentioned first to fifth embodiments, in the downlink, since the receiving end is a mobile terminal, the base station cannot directly observe the SINR (especially the amount of interference).
因此,基站需要取得或估计移动终端中的干扰量。Therefore, the base station needs to obtain or estimate the amount of interference in the mobile terminal.
具体而言,分配控制部30可以根据上行链路中的接收功率或干扰功率,分配在小区的内侧区域或小区的外侧区域可使用的无线资源(子信道以及OFDM符号)来作为在移动终端中可使用的无线资源(子信道以及OFDM符号)。Specifically, the allocation control unit 30 may allocate radio resources (subchannels and OFDM symbols) usable in the inner area of the cell or the outer area of the cell as Available radio resources (subchannels and OFDM symbols).
另一方面,分配控制部30可以使移动终端以特定的格式报告下行链路中的通信质量。On the other hand, the allocation control unit 30 may cause the mobile terminal to report the communication quality in the downlink in a specific format.
另外,分配控制部30也可以根据上行链路中的接收功率来限定对移动终端分配的子信道的候补,并要求移动终端进行对这些候补的CQI(ChannelQuality Indicatou)信息等通信质量的测定和通知,根据报告的CQI信息分配子信道。In addition, the allocation control unit 30 may limit the candidates for subchannels allocated to the mobile terminal based on the received power in the uplink, and request the mobile terminal to measure and notify communication quality such as CQI (Channel Quality Indicator) information of these candidates. , allocate subchannels according to the reported CQI information.
此时,关于在小区的内侧区域可使用的无线资源的通信质量,可以认为在该内侧区域内一定,因此无需测定在该内侧区域可使用的每一子信道的通信质量(信道状态)。In this case, since the communication quality of radio resources available in the inner area of the cell is considered constant in the inner area, it is not necessary to measure the communication quality (channel state) of each subchannel available in the inner area.
另外,在上述例子中,说明了基站估计上述通信质量的方法或者使用专用的控制信号来取得该通信质量的方法。In addition, in the above example, a method of estimating the above-mentioned communication quality by the base station or a method of obtaining the communication quality using a dedicated control signal has been described.
在IEEE802.16中,移动终端在进行初始的频带利用请求时,发送CDMA码。这里,发送的CDMA码是从预先准备的多个码中随机选择。In IEEE802.16, a mobile terminal transmits a CDMA code when making an initial frequency band utilization request. Here, the CDMA codes to be transmitted are randomly selected from a plurality of codes prepared in advance.
而且,移动终端在不发送数据时也周期性地发送CDMA码,调节发送定时、发送功率或频偏。Moreover, the mobile terminal also periodically sends the CDMA code when not sending data, and adjusts the sending timing, sending power or frequency offset.
此时,发送的CDMA码是从预先准备的多个码(不同于之前说明的进行初始的频带利用请求时的码)中随机选择。At this time, the CDMA codes to be transmitted are randomly selected from a plurality of codes prepared in advance (different from the codes used when making the initial bandwidth use request described above).
另外,分配控制部30将该预先准备的CDMA码进一步分割为多个组,并与所期望的子信道或子信道的种类(完全正交信道或准正交信道)相对应。In addition, the assignment control unit 30 further divides the pre-prepared CDMA codes into a plurality of groups, and associates them with desired subchannels or types of subchannels (perfect orthogonal channels or quasi-orthogonal channels).
然后,分配控制部30按照移动终端侧的接收功率或干扰的状况,选择所期望的子信道,并发送对应于该子信道的码。Then, the allocation control unit 30 selects a desired subchannel according to the received power and the state of interference on the mobile terminal side, and transmits a code corresponding to the subchannel.
这样,通过使用测距码(ranging code),无需另外准备CQI信息的传输用的控制信道,就可以传输CQI信息。In this way, by using a ranging code (ranging code), it is possible to transmit CQI information without separately preparing a control channel for transmitting CQI information.
(第七实施方式)(seventh embodiment)
下面,对于本实施方式的无线通信系统,以与上述第一至第六实施方式的无线通信系统的不同点为主进行说明。Hereinafter, the wireless communication system of this embodiment will be described mainly in terms of differences from the wireless communication systems of the first to sixth embodiments described above.
在上述第一至第六实施方式中,说明了同一无线通信系统的多个基站使用特定的频带内的子信道(频率)进行通信的例子,但是在本发明的第七实施方式中,如图14所示,不同的无线通信系统A、B的基站A、B使用同一频带内的子载波(频率)进行通信。In the above-mentioned first to sixth embodiments, an example in which a plurality of base stations in the same wireless communication system communicate using sub-channels (frequencies) within a specific frequency band has been described. However, in the seventh embodiment of the present invention, as shown in FIG. As shown in 14, base stations A and B of different wireless communication systems A and B perform communication using subcarriers (frequency) within the same frequency band.
这里,在同一无线通信系统的多个基站使用特定的频带内的子载波(频率)进行通信时,在由两者使用的数据帧结构之间,通过该无线通信系统中的集中控制,可以容易地将分配有完全正交信道的区域以及分配有准正交信道的区域做成相同的配置。Here, when a plurality of base stations in the same wireless communication system communicate using subcarriers (frequencies) within a specific frequency band, between the data frame structures used by both, centralized control in the wireless communication system can easily The area allocated to the fully orthogonal channel and the area allocated to the quasi-orthogonal channel are made to have the same configuration.
对此,如本实施方式,在不同的无线通信系统A、B的基站A、B使用同一频带内的子载波(频率)进行通信时,如图15(a)所示,在由基站A使用的数据帧结构和在无线通信系统B中使用的数据帧结构之间,由于两个无线通信系统的运用者不同,因此难以将分配有完全正交信道的区域以及分配有准正交信道的区域做成相同配置。因此,本发明的效果有可能减小。On the other hand, as in this embodiment, when base stations A and B of different wireless communication systems A and B communicate using subcarriers (frequency) in the same frequency band, as shown in FIG. Between the data frame structure of the wireless communication system B and the data frame structure used in the wireless communication system B, since the operators of the two wireless communication systems are different, it is difficult to separate the areas allocated with completely orthogonal channels and the areas allocated with quasi-orthogonal channels Make the same configuration. Therefore, the effect of the present invention may be reduced.
为了解决上述问题,在本实施方式中,分配控制部30通过以下方法决定分配有完全正交信道的区域以及分配有准正交信道的区域的配置。In order to solve the above-mentioned problems, in the present embodiment, the allocation control unit 30 determines the arrangement of areas to which complete orthogonal channels are allocated and areas to which quasi-orthogonal channels are allocated by the following method.
作为第一方法,分配控制部30也可以根据各区域中共存的无线通信系统数来决定该配置(突发分配模式)。As a first method, the allocation control unit 30 may determine the allocation (burst allocation pattern) according to the number of wireless communication systems coexisting in each area.
具体而言,分配控制部30也可以预先决定各区域中共存的无线通信系统数和上述配置(分配有完全正交信道的区域以及分配有准正交信道的区域的比例)的对应关系,利用该对应关系决定上述配置。Specifically, the allocation control unit 30 may determine in advance the correspondence relationship between the number of wireless communication systems coexisting in each area and the above configuration (the ratio of the area allocated with a complete orthogonal channel and the area allocated with a quasi-orthogonal channel), and use This correspondence determines the above configuration.
这里,分配控制部30可以按照周围的电波状况判断各区域中共存的无线通信系统数,也可以通过使用公共控制信道与其他无线通信系统的基站之间进行通信,判断在各区域中共存的无线通信系统数。Here, the allocation control unit 30 may determine the number of wireless communication systems coexisting in each area according to the surrounding radio wave conditions, or may determine the number of wireless communication systems coexisting in each area by using a common control channel to communicate with base stations of other wireless communication systems. number of communication systems.
作为第二方法,分配控制部30使分配有完全正交信道的区域的比例更小的无线通信系统的配置与分配有完全正交信道的区域的比例更大的无线通信系统的配置相符。As a second method, the allocation control unit 30 matches the configuration of a wireless communication system with a smaller proportion of areas allocated with completely orthogonal channels to the configuration of a wireless communication system with a greater proportion of areas allocated with completely orthogonal channels.
(第八实施方式)(eighth embodiment)
下面,对于本实施方式的无线通信系统,以与上述第一至第七实施方式的不同点为主进行说明。Hereinafter, the wireless communication system according to this embodiment will be described mainly in terms of differences from the first to seventh embodiments described above.
在进行面展开的无线通信系统中,作为限制小区的覆盖范围的要因之一,可以举报知信号的到达距离。In a wireless communication system that performs area development, the reach distance of a notification signal may be reported as one of the factors that limit the coverage of a cell.
因此,通常在进行面展开的无线通信系统中,在考虑不同无线通信系统A、B的基站A、B间的干扰的基础上,以在假想的覆盖区域的所有位置能够接收报知信号的方式来决定基站的配置、子信道的分配以及报知信号的传输参数。Therefore, generally, in a wireless communication system that performs surface development, taking into account interference between base stations A and B of different wireless communication systems A and B, broadcast signals can be received at all positions in the virtual coverage area. To determine the configuration of the base station, the allocation of sub-channels and the transmission parameters of the notification signal.
因此,这些报知信号优选使用容易确保干扰电平低的子信道的完全正交子信道来进行发送。Therefore, these broadcast signals are preferably transmitted using completely orthogonal subchannels that can easily secure subchannels with low interference levels.
而且,在不同无线通信系统的基站使用特定的频带内的子载波(频率)进行通信时,与同一无线通信系统的基站使用特定的频带内的子载波(频率)进行通信的情况不同,难以事先估计来自其他基站的干扰量,难以决定基站的配置、子信道的分配以及报知信号的传输模式。Moreover, when base stations of different wireless communication systems communicate using subcarriers (frequencies) within a specific frequency band, unlike the case where base stations of the same wireless communication system communicate using subcarriers (frequency) within a specific frequency band, Estimating the amount of interference from other base stations makes it difficult to determine the arrangement of base stations, allocation of subchannels, and transmission modes of broadcast signals.
因此,分配控制部30按照以下方法进行对报知信号的子信道分配。Therefore, the allocation control unit 30 allocates subchannels to broadcast signals in the following manner.
作为第一方法,分配控制部30也可以将至少一个报知信号分配给在各小区的外侧区域可使用的子信道。As a first method, the allocation control unit 30 may allocate at least one broadcast signal to a subchannel usable in the outer area of each cell.
例如,如图16所示,基站A的分配控制部30将与数据帧结构中的分配完全正交信道的区域对应的无线资源作为用于发送无线通信系统A中的报知信号的无线资源来进行分配,基站B的分配控制部30将与数据帧结构中的分配完全正交信道的区域对应的无线资源作为用于发送无线通信系统B中的报知信号的无线资源来进行分配。For example, as shown in FIG. 16, the assignment control unit 30 of the base station A assigns the radio resource corresponding to the area in which the complete orthogonal channel is assigned in the data frame structure as the radio resource for transmitting the notification signal in the radio communication system A. To perform allocation, the allocation control unit 30 of the base station B allocates radio resources corresponding to areas in which complete orthogonal channels are allocated in the data frame structure as radio resources for transmitting broadcast signals in the radio communication system B.
作为第二方法,分配控制部30也可以将在各小区的外侧区域可使用的子信道的一部分独占地分配给报知信号传输用。As a second method, the allocation control unit 30 may exclusively allocate a part of the subchannels usable in the outer area of each cell to broadcast signal transmission.
具体而言,各无线通信系统的分配控制部30识别作为控制信道使用的完全正交信道,不将该完全正交信道用于数据传输。Specifically, the allocation control unit 30 of each radio communication system recognizes the perfect orthogonal channel used as the control channel, and does not use the perfect orthogonal channel for data transmission.
此外,各无线通信系统的分配控制部30也可以利用同一无线通信系统内的周围的基站,识别该完全正交信道。In addition, the allocation control unit 30 of each wireless communication system may identify the complete orthogonal channel using surrounding base stations in the same wireless communication system.
(第九实施方式)(ninth embodiment)
下面,对于本实施方式的无线通信系统,以与上述第一至第八实施方式的无线通信系统的不同点为主进行说明。Hereinafter, the wireless communication system of this embodiment will be described mainly in terms of differences from the wireless communication systems of the first to eighth embodiments described above.
在上述第一至第八实施方式中,分配控制部30在数据帧结构中,在时间轴方向(OFDM符号方向)分离分配有完全正交信道的区域和分配有准正交信道的区域(参照图4、图16等)。In the above-mentioned first to eighth embodiments, the allocation control unit 30 separates the area to which the complete orthogonal channel is allocated and the area to which the quasi-orthogonal channel is allocated in the time axis direction (OFDM symbol direction) in the data frame structure (see Figure 4, Figure 16, etc.).
对此,在本实施方式的无线通信系统中,如图17所示,分配控制部30在数据帧结构中,在频率轴方向(子信道方向)分离分配有完全正交信道的区域和分配有准正交信道的区域。On the other hand, in the wireless communication system according to this embodiment, as shown in FIG. 17 , the allocation control unit 30 separates, in the frequency axis direction (sub-channel direction), the area to which the completely orthogonal channel is allocated and the area to which the channel is allocated, in the data frame structure. The region of quasi-orthogonal channels.
不管是不同无线通信系统的基站使用特定的频带内的子载波(频率)进行通信的情况,还是同一无线通信系统的基站使用特定的频带内的子载波(频率)进行通信的情况,都可以应用本实施方式。It can be applied regardless of whether base stations of different wireless communication systems use subcarriers (frequency) in a specific frequency band to communicate, or base stations of the same wireless communication system use subcarriers (frequency) in a specific frequency band to communicate. This embodiment.
(其他实施方式)(Other implementations)
本发明通过上述实施方式进行了记载,但是不应理解为构成该公开的一部分的论述以及附图限定本发明。根据该公开,本领域技术人员应明了多种代替实施方式、实施例以及运用技术。Although this invention was described by the above-mentioned embodiment, it should not be understood that this invention is limited by the statement and drawing which make a part of this indication. From this disclosure, various alternative embodiments, examples, and operating techniques should be apparent to those skilled in the art.
例如再本实施方式中,作为具有分配控制部30的无线通信装置以基站为例进行了说明,但具有分配控制部30的无线通信装置也可以是控制基站的无线控制装置或交换局等上位装置。For example, in this embodiment, a base station has been described as an example of a wireless communication device having the allocation control unit 30, but the wireless communication device having the allocation control unit 30 may also be a wireless control device that controls a base station or a high-level device such as a switching center. .
以上,使用上述实施方式详细说明了本发明,但是对于本领域技术人员来说,显然本发明并不限定于在本说明书中说明的实施方式。在不脱离由权利要求范围记载而决定的本发明的精神以及范围的情况下可以对本发明实施修正以及变更实施方式。因此,本发明的记载仅仅以例示说明为目的,对本发明不做任何限制。As mentioned above, although this invention was demonstrated in detail using the said embodiment, it is obvious to those skilled in the art that this invention is not limited to embodiment demonstrated in this specification. The present invention can be modified and the embodiments can be changed without departing from the spirit and scope of the present invention defined by the claims. Therefore, the description of the present invention is only for the purpose of illustration and description, and does not limit the present invention in any way.
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US8144658B2 (en) * | 2005-02-11 | 2012-03-27 | Qualcomm Incorporated | Method and apparatus for mitigating interference in a wireless communication system |
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US9775046B2 (en) | 2009-06-26 | 2017-09-26 | Qualcomm, Incorporated | Power management |
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WO2017181328A1 (en) * | 2016-04-18 | 2017-10-26 | 华为技术有限公司 | Interference coordination method, base station, and user equipment |
Also Published As
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CN101197653B (en) | 2010-12-22 |
JP2008167413A (en) | 2008-07-17 |
JP5156334B2 (en) | 2013-03-06 |
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