WO2009026785A1 - Procédé pour envoyer des données d'utilisateur de liaison descendante et système de communication mobile à antenne répartie - Google Patents

Procédé pour envoyer des données d'utilisateur de liaison descendante et système de communication mobile à antenne répartie Download PDF

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Publication number
WO2009026785A1
WO2009026785A1 PCT/CN2008/001499 CN2008001499W WO2009026785A1 WO 2009026785 A1 WO2009026785 A1 WO 2009026785A1 CN 2008001499 W CN2008001499 W CN 2008001499W WO 2009026785 A1 WO2009026785 A1 WO 2009026785A1
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WO
WIPO (PCT)
Prior art keywords
user
antenna
effective
information
processing unit
Prior art date
Application number
PCT/CN2008/001499
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English (en)
Chinese (zh)
Inventor
Suling Zou
Guoqin Xu
Original Assignee
Datang Mobile Communications Equipment Co., Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Datang Mobile Communications Equipment Co., Ltd filed Critical Datang Mobile Communications Equipment Co., Ltd
Publication of WO2009026785A1 publication Critical patent/WO2009026785A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission

Definitions

  • the present invention relates to the field of mobile communications, and in particular, to a downlink user data transmission method and a corresponding distributed antenna mobile communication system. Background technique
  • the conventional smart antenna system places a multi-channel smart antenna at the base station end, and a communication link is formed between the base station and the mobile station, and the base station communicates with the mobile station having the antenna in the cell through the multi-channel smart antenna. From a system architecture perspective, such a system is not fundamentally different from a traditional single-input single-out cellular communication system.
  • the traditional smart antenna system can overcome the channel path loss caused by large-scale fading and shadow fading, it can form good system coverage in the cell, solve the communication dead angle in the cell, and improve the communication service quality, but due to the traditional smart antenna system.
  • the antennas are equally spaced between the channels, so there is a correlation between the channels of the antenna. In addition, due to the correlation between the antenna channels in the traditional smart antenna system, it can be reached according to the angle.
  • the measurement positioning method is used to determine the exact angle at which each user arrives.
  • each wireless signal processing unit comprises one or more antennas, and these wireless signal processing units only need to complete the signal receiving and transmitting functions and simple pre-processing of the signals, and through the optical fiber, coaxial cable or microwave wireless channel and core processing unit Connect, complete the signal processing function in the core processing unit.
  • This system structure not only has the advantages of the traditional smart antenna system. The potential reduces the path loss, overcomes the shadow effect, and significantly increases the channel capacity through Multiple-Input Multiple-Out-put (MIMO) technology.
  • MIMO Multiple-Input Multiple-Out-put
  • different smart antennas in the distributed antenna mobile communication system are installed at different positions, and the distance between the smart antennas can reach the kilometer level, and multiple smart antennas together form a cell, that is, a distributed antenna.
  • the distance between the wireless signal processing units in the mobile communication system is much larger than the carrier wavelength, so the channel fading formed between the different base station antennas and the mobile station can be regarded as completely uncorrelated and the channel capacity is larger.
  • the communication environment faced by the distributed antenna mobile communication system is different from the communication environment under the traditional smart antenna system, and the beamforming in the conventional smart antenna system
  • the AOA measurement and positioning method is no longer suitable for distributed antenna mobile communication systems.
  • the Dynamic Channel Allocation (DCA) method under the traditional smart antenna system is no longer suitable for distributed antenna mobile communication systems.
  • each cell simultaneously transmits the same downlink signal on all the wireless signal processing units, and further, the uplink signal is processed by all the wireless signals in the cell.
  • the unit receives and transmits to the core processing unit.
  • Embodiments of the present invention provide a downlink user data sending method, which can effectively reduce distributed antennas. Downlink interference in mobile communication systems. 3
  • the embodiment of the invention provides a downlink user data sending method, which is applied to a distributed antenna mobile communication system, and the method includes:
  • the downlink data of the user is allocated to the determined corresponding effective antenna and sent to the user.
  • the embodiment of the invention further provides a distributed antenna mobile communication system, comprising: a wireless signal processing unit and a core processing unit; wherein:
  • a wireless signal processing unit configured to transmit an antenna signal
  • a core processing unit configured to determine, according to each antenna signal sent by the wireless signal processing unit, an effective antenna corresponding to each user; when transmitting downlink user data, respectively assign data sent to each user to an effective corresponding to each user Send on the antenna.
  • the embodiment of the present invention collects all antenna signals; determines corresponding effective antennas that carry valid information of each user according to the antenna signals; and distributes downlink data of the user to the determined corresponding effective antennas, and sends the same to the user, thus bringing the following Beneficial effects:
  • FIG. 1 is a flowchart of a method for transmitting downlink user data according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a method for transmitting downlink user data according to an embodiment of the present invention
  • FIG. 3 is a flowchart of a method for transmitting downlink user data according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a distributed antenna mobile communication system according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a distributed antenna mobile communication system according to an embodiment of the present invention
  • FIG. 1 is a flowchart of a method for sending downlink user data according to an embodiment of the present invention, where the method includes the following steps:
  • S102 Determine, according to the antenna signal, a corresponding effective antenna that carries valid information of each user.
  • S103 Allocate downlink data of the user to the determined corresponding effective antenna and send the data to the user.
  • the above solution can be implemented by extending the wireless signal processing unit and the core processing unit in the existing distributed antenna mobile communication system:
  • the antenna is placed in the wireless signal processing unit and can be a single channel antenna or a multi-channel antenna.
  • the core processing unit can be used to implement the functions described in step S102 and step S103.
  • the following is an example of a wireless signal processing unit and a core processing unit.
  • FIG. 2 is a second flowchart of a downlink user data sending method according to an embodiment of the present invention, where the method includes:
  • the wireless signal processing unit receives the signals of each user on each antenna and sends the signals to the core processing unit.
  • the wireless signal processing unit may further convert the signals of each user on each antenna into baseband signals of each user on each antenna, and then send the signals to the core processing unit.
  • the core processing unit calculates a channel impulse response of each user on each antenna according to signals of each user on each antenna provided by the plurality of wireless signal processing units.
  • the channel impulse response h is obtained by:
  • midamble_data(l: 128) is the 144 chip midamble in the received data of an antenna.
  • midamble_code(1 ⁇ 128) is the midamble codeword that the sender user shifts according to the sender.
  • the midamble codeword sent by the sender is configured by the RNC according to certain rules, and the sender and receiver are notified. ).
  • h is the channel impulse response.
  • the window length of h is taken as 16 , that is, the first 16 points of the Fast Fourier Transform (IRF) result are taken as the value of h.
  • the core processing unit can calculate a channel impulse response of each user on each antenna based on the received baseband signal.
  • S203 Calculate the power of each user on each antenna according to the channel impulse response of each user on each antenna.
  • the number of antennas of the base station is a total of N
  • the corresponding sequence of the channel impulse response h of the user on the ith antenna calculated in S202 is: ⁇ /3 ⁇ 4, /3 ⁇ 4,..
  • the power on is:
  • i ranges from 1 to M.
  • S204 For each user, compare the power of the user on each antenna with a set threshold, and use an antenna with a power greater than a set threshold as an effective antenna corresponding to the user;
  • the antenna is used as an effective antenna corresponding to the user.
  • the calculation rule of the power threshold P' of a user A on the antenna is:
  • P' maximum power of user A on all antennas * ⁇
  • the core processing unit of the base station can determine the downlink user data according to the effective antenna corresponding to each user determined in the S204 during the uplink transmission.
  • the method of allocation on the antenna is: for the data to be sent to a certain user, the core processing unit allocates data to be sent to the user to the effective antenna corresponding to the user according to the effective antenna corresponding to the user determined in the uplink.
  • the transmission is performed, that is, the non-effective antenna corresponding to the user does not participate in allocating data to be sent to the user. In this way, the transmit power of the effective antenna can be increased.
  • the non-effective antenna corresponding to the user is not allocated data to be sent to the user, the user data is reduced to the remaining users on the non-effective antenna corresponding to the user. Interference.
  • the effective antenna information of each user is further reported to the radio network controller (RNC) in the uplink; then the RNC can determine each antenna according to the effective antenna information of each user.
  • RNC radio network controller
  • This step can further reduce the noise in the uplink.
  • the core processing unit reports the effective antenna information of each user to the RNC by using the existing AOA measurement report item, or generates a measurement report item according to a preset rule between the core processing unit and the RNC to report the effective antenna information of the user. .
  • the core processing unit of the base station no longer measures the user position by using the AOA measurement method, and can use the measurement report item of the AOA to report the effective antenna information of each user to the RNC. .
  • the content of the reported item is no longer the angular position information of the user reported by the traditional AOA measurement, but the effective antenna information of each user.
  • the effective antenna information of each user may be encoded and reported by a pre-agreed coding rule between the core processing unit and the RNC.
  • a pre-agreed coding rule between the core processing unit and the RNC: Use hexadecimal code to record user valid information; where, specify each code Corresponding to an effective antenna of the user: the code is 7 1 indicating that the antenna corresponding to the code is the effective antenna of the user, and the code 0 indicates that the antenna corresponding to the code is the non-effective antenna of the user;
  • the antenna may report to the RNC that the combined code of the effective bit information of each antenna corresponding to each user is 0x100001, indicating that the effective antenna corresponding to the user is the antenna 1 and the antenna 6, that is, the antenna 1 and the antenna 6 carry the user.
  • the core processing unit further transmits the carrier power of each antenna to the RNC.
  • the RNC determines the location of each user based on the received effective antenna information of each user and determines the DCA mode.
  • the RNC can determine the effective antenna number corresponding to each user in the effective antenna information of each user received according to the pre-determined coding rule, because the distribution information of each antenna is planned and saved on the network side. Then, according to the correspondence between the antenna numbers pre-stored by the network side and the antenna positions, the specific location of the user is determined and the users in each antenna coverage area are determined. For example, if the effective antenna information of a user received by the RNC is 0x100001, the RNC can determine that the effective antenna of the user is the antenna 1 and the antenna 6. Therefore, the RNC can determine that the user is located in the antenna according to the antenna distribution information stored on the network side. The overlap of the coverage area of 1 and the coverage area of the antenna 6.
  • the RNC determines the DCA strategy:
  • multi-user interference may occur in the uplink due to out-of-synchronization or multipath, etc.
  • downlink transmission since the power of a single antenna is limited, For a plurality of users corresponding to the same effective antenna and under the same antenna coverage, the power of the effective antenna needs to be transmitted to multiple users, and power transmission is limited. Therefore, when the RNC performs dynamic channel allocation for users, user data corresponding to the same effective antenna and located in the same antenna coverage area can be allocated to different carriers, time slots, and code channels to reduce the communication between these users. Interference, while avoiding the competition of multiple users under the same antenna for single antenna power.
  • the RNC receives the carrier power of each antenna reported by the core processing unit, the RNC first determines whether each carrier of each antenna is overloaded according to the set antenna carrier power threshold, if some If a certain carrier power of the root antenna exceeds the set 8- day carrier power threshold, then these carrier overloads are determined.
  • the RNC When the RNC performs dynamic channel allocation for users, it tries to allocate users to carriers or time slots whose carrier power on the effective antenna does not exceed the set threshold.
  • the RNC can determine the location of each user according to the effective antenna information corresponding to each user on the core processing unit, thereby dynamically allocating resources such as carriers, time slots, and code channels of the user.
  • the RNC can implement user memory positioning and fix the DCA mode of the distributed antenna mobile communication system according to the received effective antenna information of each user. That is, the RNC can store the determined user locations and fix the DCA mode of the distributed antenna mobile communication system.
  • the core processing unit of the base station may periodically report the effective antenna information of the user to the RNC as needed, and after receiving the effective antenna information of each user, the RNC may first determine the current reception. Whether the effective antenna information of each user is consistent with the effective antenna information of each user received last time. If they are consistent, the RNC still uses the channel allocated to each user for communication last time. Otherwise, according to the effective antenna information of each user received this time. Each user re-synchronizes the dynamic channel allocation.
  • the downlink user data sending method in the distributed antenna mobile communication system can reduce interference between different users; and can avoid multiple users competing for the same antenna coverage for single antenna power, and improve antenna transmission.
  • User power reducing interference of multiple users on the same antenna in downlink transmission.
  • the capacity of the wireless communication system is greatly improved.
  • the embodiment of the present invention further provides a distributed antenna mobile communication system, as shown in FIG. 3, including: wireless signal processing Unit 31 and core processing unit 32, wherein:
  • the wireless signal processing unit 31 is configured to send the received antenna signals to the core processing unit 32.
  • the core processing unit 32 is configured to determine, according to each antenna signal provided by the wireless signal processing unit, an effective antenna corresponding to each user; when transmitting the downlink user data, respectively assign data sent to each user to each user Send on an effective antenna.
  • the distributed antenna mobile communication system has a plurality of wireless signal processing units 31.
  • the wireless signal processing unit 31 further converts the received antenna signal into a baseband signal of each user on each antenna and transmits it to the core processing unit 32.
  • the core processing unit 32 determines the baseband signal of each user on each antenna. An effective antenna for each user.
  • FIG. 4 is a schematic structural diagram of a distributed antenna mobile communication system according to an embodiment of the present invention.
  • the core processing unit 32 may further include:
  • the channel impulse response calculation subunit 41 the power calculation subunit 42, the effective antenna decision subunit 43, and the downlink user data transmission subunit 44.
  • the channel impulse response calculation sub-unit 41 is configured to calculate a channel impulse response of each user on each antenna according to the antenna signal provided by the wireless signal processing unit.
  • the power calculation sub-unit 42 is configured to calculate the power of each user on each antenna according to the channel impulse response of each user on each antenna.
  • the effective antenna decision subunit 43 is configured to determine an effective antenna corresponding to the user.
  • the limit value is determined, and whether the power of each user on each antenna is greater than the calculated power threshold is determined, and the antenna whose power is greater than the power threshold is used as an effective antenna corresponding to the corresponding user.
  • the downlink user data sending subunit 44 is configured to allocate downlink data of each user to an effective antenna corresponding to each user.
  • the core processing unit 32 in the distributed antenna mobile communication system provided by the embodiment of the present invention further includes a user effective antenna information upper subunit 51, and the distributed antenna mobile communication system further includes a dynamic channel allocation unit 52. ; among them:
  • the user effective antenna information upper subunit 51 is configured to obtain the effective antenna information corresponding to each user determined by the effective antenna determining subunit 43 and report it to the dynamic channel allocating unit 52;
  • the dynamic channel allocating unit 52 is configured to determine the network location of each user according to the effective antenna information of each user reported by the user effective antenna information reporting subunit 51, and perform dynamic channel allocation for the user according to the network location of each user.
  • the dynamic channel allocating unit 52 is disposed in the radio network controller on the network side.
  • the downlink user data sending method in the distributed ⁇ ° mobile communication system provided by the embodiment of the present invention allocates downlink data of each user to an effective antenna corresponding to the user by determining an effective antenna corresponding to each user.
  • the user may be adjusted to a different time slot or carrier corresponding to the same effective antenna and located in the same antenna coverage area, so that the user correspondence is enhanced to make the system more flexible and expandable.
  • the distributed antenna mobile communication system provided by the embodiment of the present invention can report the determined user effective antenna to the RNC, and then the RNC can further determine the user location according to the reported effective antenna information of each user, which is helpful for network side positioning. Service; In addition, the RNC can also perform dynamic channel allocation according to the user location, further optimize the resource configuration of the system, and improve the channel capacity.
  • the present invention cover the modifications and variations of the inventions

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

Abstract

L'invention porte sur un procédé pour envoyer des données d'utilisateur de liaison descendante, qui est utilisé dans un système de communication mobile à antenne répartie. Le procédé comprend les étapes consistant à : collecter tous les signaux d'antennes ; déterminer des antennes efficaces pour supporter toutes les données d'utilisateur en fonction de signaux d'antennes ; attribuer des données de liaison descendante d'utilisateur aux antennes efficaces correspondantes et envoyer celles-ci.
PCT/CN2008/001499 2007-08-23 2008-08-19 Procédé pour envoyer des données d'utilisateur de liaison descendante et système de communication mobile à antenne répartie WO2009026785A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN 200710120693 CN101374005B (zh) 2007-08-23 2007-08-23 一种下行用户数据发送方法及分布式天线移动通信系统
CN200710120693.8 2007-08-23

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WO2009026785A1 true WO2009026785A1 (fr) 2009-03-05

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Publication number Priority date Publication date Assignee Title
CN102131207B (zh) * 2010-01-15 2015-01-21 华为技术有限公司 测量上报方法、装置及系统
CN102136859A (zh) * 2010-12-16 2011-07-27 上海华为技术有限公司 一种天线数据处理方法和装置
CN104253640B (zh) * 2013-06-27 2019-01-11 普天信息技术研究院有限公司 一种小区合并系统的上行接收方法
WO2021000209A1 (fr) * 2019-07-01 2021-01-07 Telefonaktiebolaget Lm Ericsson (Publ) Procédés et dispositifs de communication sans fil

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US6308085B1 (en) * 1998-03-13 2001-10-23 Kabushiki Kaisha Toshiba Distributed antenna system and method of controlling the same
US6703977B2 (en) * 2001-03-31 2004-03-09 Alcatel Method of operating a radio-based communications system
CN1819573A (zh) * 2005-02-09 2006-08-16 朗迅科技公司 用于使用ofdm的无线分组数据通信系统的分布式多天线调度
CN1917388A (zh) * 2005-08-16 2007-02-21 东南大学 分布式天线系统及其通信方法
CN1933359A (zh) * 2005-09-15 2007-03-21 西门子（中国）有限公司 分布式天线系统中下行链路控制信息的发送方法
CN1953574A (zh) * 2005-10-18 2007-04-25 上海贝尔阿尔卡特股份有限公司 分布式基站、通信系统及其使用的信号传输方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6308085B1 (en) * 1998-03-13 2001-10-23 Kabushiki Kaisha Toshiba Distributed antenna system and method of controlling the same
US6703977B2 (en) * 2001-03-31 2004-03-09 Alcatel Method of operating a radio-based communications system
CN1819573A (zh) * 2005-02-09 2006-08-16 朗迅科技公司 用于使用ofdm的无线分组数据通信系统的分布式多天线调度
CN1917388A (zh) * 2005-08-16 2007-02-21 东南大学 分布式天线系统及其通信方法
CN1933359A (zh) * 2005-09-15 2007-03-21 西门子（中国）有限公司 分布式天线系统中下行链路控制信息的发送方法
CN1953574A (zh) * 2005-10-18 2007-04-25 上海贝尔阿尔卡特股份有限公司 分布式基站、通信系统及其使用的信号传输方法

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CN101374005A (zh) 2009-02-25

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