WO2013000243A1 - Station de base, procédé de sélection de mode de service et procédé de rétroaction de matrice de précodage - Google Patents

Station de base, procédé de sélection de mode de service et procédé de rétroaction de matrice de précodage Download PDF

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Publication number
WO2013000243A1
WO2013000243A1 PCT/CN2011/083476 CN2011083476W WO2013000243A1 WO 2013000243 A1 WO2013000243 A1 WO 2013000243A1 CN 2011083476 W CN2011083476 W CN 2011083476W WO 2013000243 A1 WO2013000243 A1 WO 2013000243A1
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Prior art keywords
base station
terminal
controller
node
nodes
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PCT/CN2011/083476
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English (en)
Chinese (zh)
Inventor
李子荣
朱登魁
焦晓晓
鲁照华
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中兴通讯股份有限公司
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Publication of WO2013000243A1 publication Critical patent/WO2013000243A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow

Definitions

  • the present invention relates to the field of communications, and in particular to a base station and a feedback method for serving mode selection and precoding matrix applied to the base station.
  • BACKGROUND With the development of mobile communication data services, requirements for wireless access systems are becoming higher and higher. However, the frequency bands used in today's wireless communication systems are getting higher and higher, the attenuation of RF signals is intensifying, and the effective coverage of base stations is reduced, especially in the case of densely populated places and high-speed mobile terminals, how to increase system capacity and Covering, reducing the number of handovers and dropped calls of the terminal is a problem that the communication system has been trying to solve.
  • MIMO Multiple Input Multiple Output
  • multi-antenna technology can reduce the frequency selective fading caused by multipath propagation of wireless signals, and utilize spatial diversity gain to improve the spectral efficiency of the base station and increase system capacity.
  • MIMO Multiple Input Multiple Output
  • all the antennas of one base station are in the same place. Due to the limited area of the base station and the small antenna spacing, the capacity of the wireless communication system is affected.
  • SUMMARY OF THE INVENTION The present invention provides a base station system and a service mode selection method applied to the base station system to at least solve the above problem of affecting the capacity of the wireless communication system due to the limited area of the base station and the small antenna spacing.
  • a base station including: a plurality of distributed nodes, configured to provide a wireless access service to a terminal; a controller, connected to a plurality of distributed nodes, configured to be from a plurality of distributed nodes One or more distributed nodes are selected as service nodes, and the service node is controlled to provide wireless access services for the terminals.
  • the controller specifies a service node for the terminal according to channel information or a user service level.
  • the serving node provides a radio access service for the terminal by using orthogonal resources, where the resource includes at least one of the following: time, frequency, coding, and space.
  • a service mode selection method is provided, which is applied to a base station as described above, including: a terminal acquires channel information of a plurality of distributed nodes of a base station; and the terminal sends a handover to a controller of the base station according to the channel information.
  • the acquiring, by the terminal, channel information of the multiple distributed nodes of the base station includes: the terminal measuring a signal to interference and noise ratio of the plurality of distributed nodes of the base station.
  • the terminal sends the handover service mode request to the controller of the base station according to the channel information, including: the terminal comparing the measured maximum signal to interference and noise ratio of the plurality of distributed nodes to a predetermined threshold; The comparison result sends a corresponding handover service mode request to the controller of the base station.
  • the terminal sends a corresponding handover service mode request to the controller of the base station according to the comparison result, including: when the maximum signal to interference and noise ratio is less than the first threshold, the terminal sends a handover to the controller to jointly send data to the terminal.
  • the terminal sends a service mode request to switch to the multi-distributed node precoding cooperation; when the maximum signal to interference and noise ratio is greater than or equal to At the second threshold, the terminal sends a request to the controller to switch the current base station.
  • the method further includes: the terminal sends the number of the distributed node that participates in transmitting data to the terminal or the number of the distributed node participating in the precoding cooperation. To the controller.
  • a service mode selection method is provided, which is applied to a base station as described above, including: a terminal acquiring channel information of a plurality of distributed nodes of a base station; and transmitting, by the terminal, channel information to a controller of the base station; The controller switches the access mode provided by the base station to a corresponding service mode according to the channel information, performs base station handover, or performs power control on multiple distributed nodes.
  • the channel information includes at least one of: a signal strength transmitted by the plurality of distributed nodes, and an interference signal strength from outside the base station.
  • a feedback method for a precoding matrix is provided, which is applied to the foregoing base station, and includes: the terminal receives an intermediate pilot transmitted by a serving node of the base station; and the terminal calculates a precoding matrix according to the intermediate pilot. Or codebook index, and feed back the precoding matrix or codebook index to the base station.
  • the method further includes: the controller of the base station groups the transmit antennas of the serving node, and assigns weights to each set of antennas; the serving node sends the intermediate pilot to the terminal by using the transmit antenna. .
  • the controller performs transmit antenna grouping in the following manner: geographic location, polarization direction or correlation.
  • the controller of the base station controls the adjacent serving node to send the intermediate pilot at different times, and notifies the time-frequency position of the intermediate pilot to the terminal.
  • a plurality of distributed nodes are used in the base station, thereby increasing the spacing of the base station antennas, expanding the coverage of the base station, and further improving the capacity of the wireless communication system.
  • FIG. 1 is a schematic structural diagram of a distributed antenna base station according to a first embodiment of the present invention
  • FIG. 2 is a schematic diagram of resource allocation of an OFDM system
  • FIG. 3 is a schematic structural diagram of a distributed antenna base station according to Embodiment 2 of the present invention
  • 4 is a flowchart of a terminal selection service mode according to Embodiment 3 of the present invention
  • FIG. 1 is a schematic structural diagram of a distributed antenna base station according to a first embodiment of the present invention
  • FIG. 2 is a schematic diagram of resource allocation of an OFDM system
  • FIG. 3 is a schematic structural diagram of a distributed antenna base station according to Embodiment 2 of the present invention
  • 4 is a flowchart of a terminal selection service mode according to Embodiment 3 of the present invention
  • FIG. 5 is a flow chart of pilot transmission and precoding matrix feedback according to Embodiment 6 of the present invention
  • FIG. 6 is a flowchart according to Embodiment 6 of the present invention
  • FIG. 7 is a schematic diagram of a dual polarized antenna array according to Embodiment 6 of the present invention.
  • the base station includes: a plurality of distributed nodes D210, D211, D220, and D230; and a controller C210.
  • a transceiver Each distributed node includes at least one transmit antenna, and all distributed nodes are directly or indirectly connected to the controller C210, and at least one distributed node and the controller are not in the same location; the distributed node is directed to the terminal (U210, U230) Or another distributed node sends and receives radio frequency signals; the controller selects one or more distributed nodes to send or receive data to or from the terminal through the transceiver (same location as the controller).
  • the distributed nodes have only one transmitting antenna unless otherwise stated. There may be more than one receiving antenna for the terminal and the distributed node.
  • the controller C210 is a distributed node that specifies a service for the user terminal through channel information (terminal feedback or obtained by channel reciprocity) or a user service level. As shown in FIG. 1, the distributed node D210 is connected to the terminal U210 through the wireless channel L211, U210. The channel quality of each distributed node is measured and reported to the controller. When the U210 moves to another location, the channel quality of the L211 deteriorates.
  • the controller transmits the node D211 (equipped with one or more receiving antennas) to serve the U210 according to the received feedback information, but due to the limitation of the actual conditions, the D211 And the controller can not be connected by wire (for example, in dense urban areas, D211 and controller are on both sides of the street, U210 enters indoors), so data is sent by D210 to D211 through wireless channel R211, and then D211 reaches U210 through wireless channel L212. . If the data traffic within the D211 service range is large, a combination of one or more of the following methods is provided to transmit data for D211:
  • the controller can assign multiple distributed nodes to transmit data for D211, such as D220 in Figure 1, then D210, D220 (send) and D211 (receive, with multiple receiving antennas) to form a MIMO transmission system, and use The same resource scheduling is D211 service;
  • D210 and D220 use orthogonal resources to serve D211, so-called orthogonal, that is, one or several of time division, frequency division, code division, and space division multiplexing technologies are used for D211 service. ; If D211 has only one receiving antenna, use STBC (Space-Time Block Coding) or SFBC
  • the resources mentioned here include one or a combination of time, frequency, coding, space, such as a combination of time and frequency, specific to the actual 0FDMA.
  • each cell represents a time-frequency resource, which can Expressed in two-dimensional coordinates (subcarriers, symbols), the subcarriers represent the frequency dimension and the symbols represent the time dimension.
  • D211 is replaced with a user terminal, the above method is also applicable. If there are few data sent and received in some nodes in the base station (called low load nodes), and the resources available to neighboring nodes are detected, the controller sends signaling to enable users in these nodes to switch to neighboring nodes, and the low load nodes do not. Data is then sent to reduce system power consumption and interference.
  • FIG. 3 is a schematic structural diagram of a distributed antenna base station according to Embodiment 2 of the present invention.
  • the distributed base station includes: multiple distributed nodes (D210, D220, D230) and controller C210, which are transmitted and received.
  • Device. Provide wireless access services for terminals (U210, U220, U230) through distributed nodes.
  • the base station in this embodiment has only one level of distributed nodes, that is, all distributed nodes are directly connected to the controller.
  • FIG. 4 is a flowchart of a terminal selection service mode according to Embodiment 3 of the present invention.
  • This embodiment uses the base station system in Embodiment 2, where each distributed node configures multiple transmit antennas, and only one level Distributed node.
  • This embodiment mainly relates to switching between different nodes in a same base station in a distributed antenna system.
  • a set of multiple distributed nodes that send and receive data for the same user is called a cooperative cluster, and multiple cooperative clusters may exist in one base station. All the measured values in the following methods may be statistical values or instantaneous measured values, which are specifically determined by the terminal.
  • the node service mode in this embodiment includes: The terminal is served by a plurality of distributed nodes, and the terminal is served by one node. The switching of the service mode does not involve the switching of the controller (or base station), that is, the terminal still uses the original base station controller.
  • This embodiment describes in detail the process of the terminal measuring the channel information of each distributed node, and the process of initiating the node service mode switching or the controller switching request after performing the calculation. As shown in FIG.
  • Step S402 Calculating the SINR of each node .
  • U210 is provided with access service by node D210.
  • the signal to interference and noise ratio of the terminal U210 is SINR;
  • the signal (power) strength of the U210 received by the D210 is RSSI;
  • the interference outside the base station is measured as INT1 at time t2;
  • the intensity of the N signal is the largest in the base station measured at time t3.
  • the signal strength of the remaining nodes outside the node is INTO, where N is broadcast by C210 to the terminal in the base station, or can be obtained by the terminal in the following manner:
  • N ⁇ i ⁇ R SSI (i ) - R SSI th > R SSI hy ⁇
  • th and ⁇ ty are broadcast by C210 to the terminal in the base station, and the above formula is to determine the number of nodes whose received signal strength is greater than the threshold, and N may be determined by the terminal by other methods; there is no necessary connection between tl, t2, and t3; U210 simultaneously measures the signal strength of neighboring nodes in the base station, and obtains RSSI(i) according to the arrangement from large to small.
  • SINR ( 1 ) corresponds to the node with the largest dry-noise ratio of U210.
  • SINRc is the signal to interference and noise ratio threshold for the node cooperative transmission
  • SINRp is the admission threshold for cooperative precoding.
  • Step S404 compares SINR(1) and SINRc. If SINR(1) ⁇ SINRc, U210 sends a multi-node joint data request CO_REQ to controller C210, requesting the current controller and/or the neighboring controller to add a node for sending data for it. And send the participating node number to the current controller; otherwise, go to step S406.
  • Step S410 If SINRCl)-SINR>SINRh, the sending node switches to request HO_REQ, and requests to switch to the node corresponding to SINR(l). Otherwise, U210 is still only served by the original node D210, and no further processing is performed.
  • Embodiment 4 In this embodiment, the terminal measures channel information of each node, and feeds back to the base station, where the base station decides to perform mode switching, base station handover, or performs distributed node power control. The following is a detailed description of the execution flow of this embodiment.
  • a set of nodes that meet the above conditions is called an active cluster, and nodes in the active cluster can be updated at different times.
  • the RSSI can be measured by each node.
  • the interference outside the base station is measured as INT1;
  • the signal strength of the remaining nodes except the node with the strongest N signal strength in the base station is INTO; there is no necessary connection between tl, t2, and t3;
  • RSSI i
  • the received signal strength RSSI data and the interference signal strengths INT1, INTO are sent by the terminal to the controller C210, and the transmission may be periodically sent by the terminal or sent by the C210 requesting terminal.
  • the controller C210 determines whether the U210 needs to switch the node service mode or the base station handover, or performs power control, and sends related signaling.
  • the controller C210 determines whether the U210 needs to switch the node service mode or the base station handover, or performs power control, and sends related signaling.
  • the controller C210 determines whether the U210 needs to switch the node service mode or the base station handover, or performs power control, and sends related signaling.
  • the controller C210 determines whether the U210 needs to switch the node service mode or the base station handover, or performs power control, and sends related signaling.
  • the method further involves feedback of a precoding matrix (or a codebook index), and the base station needs to notify the terminal by using a corresponding pilot method to calculate a precoding matrix (or a precoding matrix in the precoding matrix code).
  • a precoding matrix or a precoding matrix in the precoding matrix code.
  • the number in this section and other channel related parameters.
  • the MIMO wireless channel coefficient matrix be H, and its rank is j; the transmitted signal X is a k-dimensional vector, in order to better utilize the channel information and solve the problem that the receiving end cannot restore the transmitted signal in the case of k>j, in the MIMO system
  • the precoding technique is introduced.
  • the maximum number of antennas provided in a single MIMO-OFDM system the maximum number of nodes that support distributed antenna M f, is supported by the terminal ⁇ , ⁇ the larger value of ⁇ ⁇ ⁇ ⁇ , ⁇ .
  • the interference threshold RSSI0 caused by the neighboring nodes, the coordinated frequency resource set is R, the same frequency resource in R can serve one or more terminals; the service is provided by a single node Frequency resource set is
  • D210 and D220 serve the terminal U210 at the same time. For the purpose of reducing interference and pilot pattern reuse, D210 and D220 continue to use the original intermediate pilot, but transmit them separately in time, for example, in different symbols. Or send on a sub-frame (actual system, such as LTE, WiMax), set D210 at time t1 to
  • the channel of U210 is ⁇ ⁇ , and the corresponding precoding matrix is calculated as Pl .
  • the channel of D220 to U210 is measured as H 2
  • the corresponding precoding matrix is calculated as P 2
  • ⁇ ⁇ feedback
  • C110 uses ⁇ ⁇ to send data
  • This method is also applicable to the case where a collaborative cluster serves multiple users on the same resource.
  • the signal sent by the signal is x
  • P is a precoding matrix, H tH 1 ⁇ ] , and is divided into two cases: If the distributed nodes participating in the cooperation simultaneously transmit pilots, use a new pilot pattern, for example, D210 and D220 each have four transmit antennas, U210 There are two receiving antennas, then D210, D220 and U210 form an 8 X 2 MIMO antenna, and the transmitted pilot is the 8-antenna pilot pattern in the actual system.
  • Embodiment 6 When multi-node cooperation sends data to the terminal, if the number of physical antennas participating in the cooperation exceeds the maximum number of antennas that can be supported by a single node, the pilot transmission and precoding matrix feedback methods described in this embodiment may be used. As shown in FIG.
  • Step S502 Divide all antennas participating in the collaboration into a plurality of antenna groups. Let D210 and D220 each have 8 transmitting antennas, which together serve U210. U210 has two receiving antennas. The D210 is numbered 1 to 8. According to one or more of the following principles, antennas 1 ⁇ 8 are divided into 4 groups:
  • the adjacent antennas are divided into groups. As shown in Figure 6, all antennas are distributed in a straight line, divided into [1, 2], [3, 4], [5, 6], [7, 8] (this This number is only used as an example, the same below) 2)
  • the antennas of the same polarization direction are divided into two groups ⁇ 1, 3, 5, 7 ⁇ and ⁇ 2, 4, 6, 8 ⁇ , as shown in Fig. 7
  • the tilt angle is the direction of the electric field of the polarized wave of the antenna, not the actual antenna placement. It is divided into four groups [1, 3], [2, 4], [5, 7], [6, 8].
  • the correlation is divided into a group, two antennas in each group.
  • the antenna of the D220 can be divided into four groups of antennas, each group of two antennas.
  • the grouping of the antennas is not limited to the above method, and the antennas in the same group may belong to different nodes as long as the number of antennas in the group is the same.
  • the two nodes have a total of 8 antenna groups.
  • the 8 antenna groups and the two antennas of the U210 form an equivalent 8 ⁇ 2 MIMO antenna.
  • the equivalent channel transmission matrix is H ⁇ , and the two nodes cooperate.
  • the intermediate pilot is transmitted, and the pilot pattern is the 8-antenna pilot pattern used by a single node.
  • each group of antennas is weighted, and the antennas in the same group send the same data. For example: In Figure 6,
  • the weight corresponding to [1, 2] is vector ⁇ : ⁇ 1 ' 1 ' 1 ⁇ 2 ], where i in ⁇ " represents the ith antenna, and j is the number of the antenna in the antenna group.
  • terminal U210 H ⁇ is used to calculate the precoding matrix P. If the system uses the quantized codebook set, the most suitable codebook is found in the codebook set, and the index in the codebook set is fed back to the node D210 or D220. in the present embodiment, the controller transmit the pilot intermediate according to the following criteria. coordinated cluster, and there may be a precoding simultaneously within a base station cluster.
  • the original pilot pattern is used in the range of R'; the original pilot pattern is used in the R' range using the method shown in Embodiment 5 in the R range.
  • the controller selects one in the cluster.
  • the node transmits the intermediate pilot in all frequency resources as long as the intermediate pilot is transmitted; other nodes in the cluster, if the intermediate pilot is synchronously transmitted, the intermediate pilot is transmitted in all frequency resources, otherwise only in the R' range Send the original pilot pattern internally.
  • the controller performs an asynchronous operation: the adjacent node transmits the pilot at the time of staggering to avoid collision, and notifies the terminal of the time-frequency position of the pilot.
  • Embodiments provide a distributed base station using multi-antenna technology, and also provide a mode switching method of a serving node and a pilot transmission and precoding moment in different working modes. The feedback method of the array. By adopting multiple distributed nodes in the base station, the spacing of the base station antenna is increased, the coverage of the base station is expanded, and the effect of improving the capacity of the wireless communication system and reducing the call drop rate is achieved.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

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

Abstract

La présente invention concerne une station de base, un procédé de sélection de mode de service et un procédé de rétroaction de matrice de précodage. La station de base comprend : une pluralité de nœuds distribués, configurés pour fournir un service d'accès sans fil à un terminal ; un dispositif de commande relié à la pluralité de nœuds distribués et configuré pour sélectionner un ou plusieurs nœuds distribués parmi la pluralité de nœuds distribués en tant que nœud de service, et pour commander le nœud de service de manière à fournir un service d'accès sans fil au terminal. En utilisant une pluralité de nœuds distribués dans la station de base, la présente invention permet d'augmenter l'espacement des antennes de station de base et d'élargir également la zone de couverture de la station de base, améliorant ainsi la capacité du système de communication sans fil.
PCT/CN2011/083476 2011-06-29 2011-12-05 Station de base, procédé de sélection de mode de service et procédé de rétroaction de matrice de précodage WO2013000243A1 (fr)

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CN201110178783.9A CN102394675B (zh) 2011-06-29 2011-06-29 基站、服务模式选择方法及预编码矩阵的反馈方法

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WO2014169418A1 (fr) * 2013-04-15 2014-10-23 Qualcomm Incorporated Formation de faisceaux d'élévation flexible
JP6462879B2 (ja) * 2014-12-09 2019-01-30 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． 適応的フローテーブルを処理する方法及び装置
CN107635267A (zh) * 2017-08-31 2018-01-26 努比亚技术有限公司 一种建立连接的方法、装置、基站和计算机可读存储介质
CN113595599B (zh) * 2021-09-30 2021-12-10 华东交通大学 面向5g的群簇协作通信异构系统和干扰抑制的方法

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CN101198175A (zh) * 2007-12-05 2008-06-11 中兴通讯股份有限公司 基于分布式基站系统的切换方法及系统
EP2164186A2 (fr) * 2008-09-12 2010-03-17 Fujitsu Limited Procédé de contrôle des caractéristiques de communication, procédé de contrôle de pilote, station de base et station mobile
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