WO2016132525A1 - 無線通信システム及び無線通信方法 - Google Patents
無線通信システム及び無線通信方法 Download PDFInfo
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- WO2016132525A1 WO2016132525A1 PCT/JP2015/054744 JP2015054744W WO2016132525A1 WO 2016132525 A1 WO2016132525 A1 WO 2016132525A1 JP 2015054744 W JP2015054744 W JP 2015054744W WO 2016132525 A1 WO2016132525 A1 WO 2016132525A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
- H04B7/15542—Selecting at relay station its transmit and receive resources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15557—Selecting relay station operation mode, e.g. between amplify and forward mode, decode and forward mode or FDD - and TDD mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
Definitions
- the present invention relates to a radio communication system and a radio communication method, and more particularly to a radio communication system and a radio communication method in which a frequency channel is divided into a plurality of segments and relayed using different segments in each relay section.
- Patent Document 1 discloses a technique in which one frequency channel (channel band) is divided into a plurality of segments and used to relay communication between base stations via a plurality of relay stations. With this technology, the frequency is effectively used.
- FIG. 6 shows a configuration of a wireless communication system 201 of a three-stage relay system.
- FIG. 7 shows an example of a frame format used for the three-stage relay system.
- one frequency channel 250 is divided into three segments (seg0, seg1, seg2) in the frequency axis direction.
- a DL (downlink) section is first arranged in the time axis direction, and a UL (uplink) section is arranged across a predetermined guard gap.
- an FCH Frae Control Header
- a DL / UL MAP region are provided in seg0 after the Preamble region of the frequency channel 250 as a whole. Subsequently, a Burst DL Data area is provided. Furthermore, in the UL section, a Burst UL Data area is provided following the control area.
- allocation information in the DL direction and the UL direction is described. Seg1 and seg2 have the same configuration.
- the base station 210 has one MS (radio unit with mobile station function) 211
- the first relay station 220 has two BSs (radio units with base station function) 221, 222
- the relay station 230 includes two MSs 231 and 232
- the terminal station 240 includes one BS 241.
- the MS is a radio unit having a mobile station function, and performs radio transmission / reception with respect to the BS.
- the BS is a radio unit having a base station function, and performs radio transmission / reception with respect to the MS.
- the first relay section 261 uses seg0 as the frame format 251; the second relay section 262 uses seg1 as the frame format 252; and the third relay section 263 uses seg2 as the frame format 253. Relaying is possible.
- the relay system at the time of two-stage relay has a problem that two segments are used and one segment is wasted.
- Patent Document 1 Although the deterioration of the reception quality due to the sneaking transmission wave can be reduced, the above problem is not taken into consideration and another technique is required.
- the present invention has been made in view of such conventional circumstances, and aims to solve the above problems.
- the present invention is a radio communication system having a function of dividing a frequency channel into three segments and relaying using different segments in each relay section, wherein the relay station that performs relaying is configured to perform uplink processing for throughput.
- a segment control unit that controls to use two segments to be used in the emphasized direction is used for the downlink and uplink segments in each relay section.
- the segment control unit may determine whether to use two or one segment to be used in a direction to be emphasized with reference to communication quality.
- the segment control unit may increase the output intensity when using one segment to be used in the important direction.
- the segment control unit may make the downlink section and the uplink section asymmetric.
- the communication used for the relay may be an OFDM scheme.
- the present invention is a radio communication method for dividing a frequency channel into three segments and relaying using different segments in each relay section, wherein the relay station that performs the relay performs uplink or downlink throughput.
- a segment control unit that controls to use two segments to be used for the downlink and uplink in each relay section is used in the direction to be emphasized.
- a wireless communication method that divides a frequency channel into three segments and relays using different segments in each relay section, The present invention is characterized in that the segments used for the downlink and uplink in each relay section use two segments in the direction in which importance is attached to the throughput of the entire relay system in accordance with the importance of uplink or downlink. Communication method.
- ⁇ First Embodiment> 1 and 2 are diagrams showing a configuration of the wireless communication system 1 according to the present embodiment and frequency channel use segments. In the figure, the direction from left to right is “downward”, and the direction from right to left is “upward”.
- FIG. 1 shows an example in which a frequency channel is divided into three segments and one segment is used in each relay section.
- FIG. 2 shows an example in which the frequency channel is divided into three segments and two segments are used in the uplink direction in each relay section.
- the segment usage mode shown in FIG. 1 is used.
- the uplink direction is important, that is, when the uplink data amount is large, the segment usage mode shown in FIG. 2 is used.
- the operation method illustrated in FIG. 1 is referred to as a first method
- the operation method illustrated in FIG. 2 is referred to as a second method.
- the wireless communication system 1 includes a base station 10, a relay station 20, and a terminal station 30.
- the base station 10 includes a base station MS11.
- the relay station 20 includes first and second relay stations BS21 and 22.
- the terminal station 30 includes a terminal station MS31.
- the base station MS and the terminal station MS are simply expressed as “MS”, and the first and second relay stations BS are simply expressed as “BS”.
- antennas 12, 23, 25, and 32 are connected to the base station MS11, the first relay station BS21, the second relay station BS22, and the terminal station MS31, respectively.
- DL and UL are based on the relay station 20. That is, transmission from the relay station 20 (first and second relay stations BS21 and 22) to the base station 10 and the terminal station 30 is DL. The transmission from the base station 10 and the terminal station 30 to the relay station 20 (first and second relay stations BS21 and 22) is UL.
- the relay section between the base station 10 and the relay station 20 is referred to as a first relay section 41.
- a relay section between the relay station 20 and the terminal station 30 is referred to as a second relay section 42.
- FIG. 3 is a functional block diagram showing a schematic configuration of the first relay station BS21 of the relay station 20.
- the second relay station BS22 has the same configuration.
- the base station MS11 of the base station 10 and the terminal station MS31 of the terminal station 30 can be realized with a general MS configuration.
- the device in a general configuration in recent years, the device is configured as a device having both functions integrally, and functions as the BS or the MS by a predetermined switch. It starts as BS or MS depending on which switch is set when the device is started. Therefore, as a matter of course, the configuration shown in the present embodiment may be such that the same type of device functions as a BS or an MS by a predetermined switch.
- one frequency channel 50 is divided into three segments (seg 0 to 2). It is divided into The division is the same in the second method as shown in FIG.
- seg0 and seg1 are used out of the three segments, and seg2 is not used. Note that the more specific data configuration of each segment is the same as the configuration shown in FIG. 7, and therefore, the following description will focus on the number of segments used mainly.
- Seg1 is used for both the DL section 51a and the UL section 52a for wireless transmission / reception in the first relay section 41.
- seg0 is used for both the DL section 51b and the UL section 52b.
- seg1 and seg2 are used in wireless transmission / reception in the DL section 51a of the first relay section 41.
- seg0 is used in radio transmission / reception in the DL section 51b of the second relay section 42.
- Seg1 is used for both DL and UL for wireless transmission and reception in the first relay section 41. That is, seg1 among the divided segments is used for wireless transmission and reception between the base station MS11 and the first relay station BS21.
- seg0 is used for both DL and UL. That is, seg0 is used among the divided segments for communication between the second relay station BS22 and the terminal station MS31. Of the divided segments, seg2 is not used.
- the relay station 20 operates the first and second relay stations BS21 and 22 and performs radio transmission and reception using the antennas 23 and 25, respectively.
- FIG. 3 is a functional block diagram showing a schematic configuration of the relay stations BS21 and BS22.
- the relay station BS21 that communicates with the base station MS11 of the base station 10 will be described.
- the relay station BS21 includes a network I / F unit 61, a timing control unit 62, a primary modulation unit 63, an OFDM modulation unit 64, an RF unit 65, an OFDM demodulation unit 66, a communication quality determination unit 67, and a segment control unit 70.
- the network I / F unit 61 is a LAN-I / F, for example, and is connected to the other relay station BS22 by a LAN cable or the like.
- the timing control unit 62 controls data arrangement and timing of frames. Data to be transmitted (transmission data) is input to the timing control unit 62 via the network I / F unit 61.
- the timing control unit 62 maps the input transmission data to subcarriers (segments) and outputs the data to the primary modulation unit 63.
- the timing control unit 62 performs mapping according to the number of segment divisions determined by the segment control unit 70 described later. Therefore, the timing control unit 62 appropriately controls the DL and UL timings and the subcarriers to be used.
- the primary modulation unit 63 modulates the data input from the timing control unit 62 by executing an adaptive modulation function, and generates a primary modulation signal for each subcarrier allocated by the timing control unit 62.
- the generated primary modulation signal is output to OFDM modulation section 64.
- the OFDM modulation unit 64 performs orthogonal transform from the frequency signal to the time axis signal by inverse FFT on the primary modulation signal for each subcarrier input from the primary modulation unit 63, and the generated baseband signal is converted into the RF unit 64. Output to.
- the RF unit 65 converts the signal input from the OFDM modulation unit 64 into a radio frequency signal and outputs the signal to the antenna 23. In the DL section, this signal is output from the antenna 23 to the space, more specifically, toward the base station 10 (base station MS11).
- the primary modulation unit 63 converts the radio frequency signal received by the antenna 23 into a baseband signal and outputs the baseband signal to the OFDM demodulation unit 66.
- the OFDM demodulator 66 converts the received modulated signal for each subcarrier by high-speed Fourier transform (FFT), demodulates it, and outputs the received data to the relay station BS22 via the network I / F unit 61.
- FFT high-speed Fourier transform
- the communication quality determination unit 67 measures the quality of the received modulation signal, and transmits the C / N information in the direction (downward) from the terminal station 30 to the relay station 20 to the timing control unit 62 (or the primary modulation unit 63). Notice.
- the notified C / N information and transmission data in the direction from the MS (base station MS11) to the BS (first relay station BS21) are subjected to primary modulation, and a primary modulation signal for each subcarrier is output to the OFDM modulation unit 64. .
- the segment control unit 70 controls what kind of subcarrier (segment) the carrier is divided into when transmitting and receiving data. More specifically, the segment control unit 70 determines whether to divide into three segments or two segments. Whether to divide into three segments or to divide into two segments is determined by the system administrator by operating a predetermined switch when the system is activated. The segment control unit 70 controls the division mode and usage mode of the segment by changing the setting value of the configuration file. Specifically, it is controlled by an index described in a preamble (see FIG. 7) in the frame format. The base station MS11 and the terminal station MS31 that have received the data can determine in what segmentation mode and usage mode the wireless communication system 1 is operated by referring to the index described in the preamble. .
- the segment control unit 70 controls DL: UL. Specifically, it is determined whether DL: UL is 1: 1 or 2: 1 (or 1: 2).
- the throughputs of the first method and the second method are compared.
- the second method will be described with an example of two-stage relay when importance is placed on uplink throughput.
- the time ratio between DL and UL (DL: UL) is set to 1: 1 in both the first method and the second method.
- the uplink direction in the first relay section 41 is DL, and here, two segments (seg1 and seg2) are used.
- the uplink direction in the second relay section 42 is UL, and uses two segments (seg0 and seg1). That is, a 2/3 area is used in the frequency axis direction, and a 1/2 area is used in the time direction as in the first method.
- DA2 / DA1 is as follows.
- the first method and the first method are switched by switching predetermined switches provided in the MS and BS. It is possible to switch the operation selection of the two methods. It is also possible to automatically select the operation of the first method and the second method with reference to the communication quality.
- FIG. 4 a process that is automatically performed will be described.
- the first relay station BS21 of the relay station 20 controls the operation selection of the first method and the second method in the wireless communication system 1 in an integrated manner.
- each component that is, the base station MS11, the first and second relay stations BS21 and 22, and the power switch of the terminal station MS31 are turned on to start Processing is started (S10).
- the segment control unit 70 determines whether the designated operation method is the first method or the second method (S12).
- the segment control unit 70 starts up and operates in the first method (S14).
- the segment control unit 70 starts up in the second method (S16). After startup, the segment control unit 70 refers to the communication quality obtained by the communication quality determination unit 67, for example, the C / N value or the like, and is higher than a predetermined quality, that is, sufficient throughput can be obtained by the second method. Whether or not (S20).
- the segment control unit 70 controls the use of the segment by the second method (S22).
- the segment control unit 70 controls the use of the segment by the first method (S24).
- the segment control unit 70 increases the output intensity, that is, the amplitude value of the output radio wave (S26).
- the segment control unit 70 may perform control so as to obtain an optimum output intensity based on communication quality and throughput.
- the segment control unit 70 performs control so as to suppress the amplitude according to the power supply status (usable time, etc.) when power saving is important, and increases the amplitude value when throughput is important. Can be controlled.
- FIG. 5 is a diagram showing the wireless communication system 1 of this embodiment and the frame formats 150a and 150b used. Since the configuration of the wireless communication system 1 can be realized in the same manner as in the first embodiment, the description will be made mainly focusing on the frame formats 150a and 150b.
- the time ratio (DL: UL) between the DL section and the UL section is 1: 2, and this is an example when importance is placed on the uplink throughput.
- the uplink direction in the first relay section 41 is a DL section, and here, two segments are used.
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Abstract
Description
また、前記セグメント制御部は、通信品位を参照して重視する方向に用いるセグメントを2つ使用するか1つを使用するかを決定してもよい。
また、前記セグメント制御部は、重視する方向に用いるセグメントを1つを使用する場合に、出力強度を上げてもよい。
また、前記セグメント制御部は、ダウンリンク区間及びアップリンク区間を非対称としてもよい。
前記中継に用いられる通信は、OFDM方式であってもよい。
本発明は、周波数チャネルを3つのセグメントに分割し各中継区間で異なるセグメントを使用して中継を行う無線通信方法であって、前記中継を行う中継局は、スループットについて、上り方向又は下り方向のいずれかに重視する方向がある場合、各中継区間におけるダウンリンクおよびアップリンクに使用するセグメントについて、重視する方向に用いるセグメントを2つ使用するよう制御するセグメント制御部を備える。
周波数チャネルを3セグメントに分割し各中継区間で異なるセグメントを使用して中継を行う無線通信方法であって、
本発明は、各中継区間におけるダウンリンクおよびアップリンクに使用するセグメントを、中継システム全体のスループットを上り重視もしくは下り重視に応じて、重視する方向のセグメントを2つ使用することを特徴とする無線通信方法。
図1及び図2は、本実施形態に係る無線通信システム1の構成及び周波数チャネルの使用セグメントを示した図である。図中の左から右方向を「下り方向」、右から左方向を「上り方向」としている。
DA1=(1/2)×(1/3)=1/6
DA2=(1/2)×(2/3)=1/3
DA2/DA1=(1/3)÷(1/6)=2
すなわち、第2の方式のスループットは第1の方式のスループットの2倍となる。つまり、上り方向または下り方向のいずれかの方向のスループットを重視する場合に、重視する方向のスループットを増大させることができる。
図5は、本実施形態の無線通信システム1及び使用されるフレームフォーマット150a、150bを示す図である。無線通信システム1の構成は第1の実施形態と同一で実現できるので、主にフレームフォーマット150a、150bに着目して説明する。
第1の中継区間41ではDL区間であるので、時間軸方向に1/3のエリア、セグメントを2つ使用するので周波数軸方向に2/3となる。したがって、データエリア比率DA21は次の通りとなる。
DA21=(1/3)×(2/3)=2/9
DA22=(2/3)×(1/3)=2/9
10 基地局
11 基地局MS
12、23、25、32 アンテナ
20 中継局(中継装置)
21 第1の中継局BS
22 第2の中継局BS
30 端末局
31 端末局MS
41 第1の中継区間
42 第2の中継区間
50a、50b 周波数チャネル
51a、51b DL区間
52a、52b UL区間
61 ネットワークI/F部
62 タイミング制御部
63 一次変調部
64 OFDM変調部
65 RF部
66 OFDM復調部
67 通信品位判定部
70 セグメント制御部
Claims (6)
- 周波数チャネルを3つのセグメントに分割し各中継区間で異なるセグメントを使用して中継を行う機能を備えた無線通信システムであって、
前記中継を行う中継局は、
スループットについて、上り方向又は下り方向のいずれかに重視する方向がある場合、各中継区間におけるダウンリンクおよびアップリンクに使用するセグメントについて、重視する方向に用いるセグメントを2つ使用するよう制御するセグメント制御部を備えることを特徴とする無線通信システム。 - 前記セグメント制御部は、通信品位を参照して重視する方向に用いるセグメントを2つ使用するか1つを使用するかを決定することを特徴とする請求項1に記載の無線通信システム。
- 前記セグメント制御部は、重視する方向に用いるセグメントを1つを使用する場合に、出力強度を上げることを特徴とする請求項2に記載の無線通信システム。
- 前記セグメント制御部は、ダウンリンク区間及びアップリンク区間を非対称とすることを特徴とする請求項1から3までのいずれかに記載の無線通信システム。
- 前記中継に用いられる通信は、OFDM方式であることを特徴とする請求項1から4までのいずれかに記載の無線通信システム。
- 周波数チャネルを3セグメントに分割し各中継区間で異なるセグメントを使用して中継を行う無線通信方法であって、
各中継区間におけるダウンリンクおよびアップリンクに使用するセグメントを、中継システム全体のスループットを上り重視もしくは下り重視に応じて、重視する方向のセグメントを2つ使用することを特徴とする無線通信方法。
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JP2014060696A (ja) * | 2012-08-22 | 2014-04-03 | Kyocera Corp | 基地局、通信システム、中継装置及び通信制御方法 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN108768488A (zh) * | 2018-03-13 | 2018-11-06 | 深圳捷豹电波科技有限公司 | 一种数据传输方法以及中继装置 |
CN108768488B (zh) * | 2018-03-13 | 2021-02-26 | 深圳捷豹电波科技有限公司 | 一种数据传输方法以及中继装置 |
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US20180048379A1 (en) | 2018-02-15 |
JP6386654B2 (ja) | 2018-09-05 |
US10374688B2 (en) | 2019-08-06 |
JPWO2016132525A1 (ja) | 2017-10-05 |
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