WO2012048631A1 - 基带单元与远端射频单元间的数据传输方法及分布式基站 - Google Patents

基带单元与远端射频单元间的数据传输方法及分布式基站 Download PDF

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WO2012048631A1
WO2012048631A1 PCT/CN2011/080633 CN2011080633W WO2012048631A1 WO 2012048631 A1 WO2012048631 A1 WO 2012048631A1 CN 2011080633 W CN2011080633 W CN 2011080633W WO 2012048631 A1 WO2012048631 A1 WO 2012048631A1
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rru
bbu
data transmission
data
belongs
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PCT/CN2011/080633
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English (en)
French (fr)
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郭俊峰
江溯
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中兴通讯股份有限公司
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Publication of WO2012048631A1 publication Critical patent/WO2012048631A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/08Access restriction or access information delivery, e.g. discovery data delivery

Definitions

  • the present invention relates to the field of cellular mobile communications, and in particular, to a data transmission method between a baseband unit and a remote radio unit and a distributed base station.
  • the baseband portion of the conventional base station is installed in a machine rejection together with the radio frequency portion.
  • the machine is placed in the indoor equipment room, and the antenna is placed at a higher position such as an outdoor tower or a pole.
  • the RF signal input and output from the RF part is connected to the antenna through the feeder cable.
  • the distributed base station divides the traditional macro base station into two parts: a baseband processing unit and a radio frequency processing unit.
  • the baseband unit (BBU) and the remote radio unit (RRU) are connected through an interface.
  • a structure in which the baseband unit is separated from the remote radio unit is realized.
  • the base station of this structure is closer to the antenna, which can reduce the loss of the RF signal and reduce the construction difficulty of the feeder cable and the antenna connection.
  • Time Division-Synchronous Code Division Multiple Access is one of the third generation mobile communication standards. While third-generation mobile communications are beginning to be commercialized in China, mobile communication technologies are also evolving. Compared with the third generation mobile communication technology, the new generation mobile communication technology currently under development has the advantages of higher data transmission rate, higher spectrum utilization rate and smaller delay.
  • International Mobile Communications Standards Organization third generation mobile communication Partnership Project (3GPP, 3 rd Generation Partnership Project ) has released the long-term evolution (LTE, Long Term Evolution) technology specifications, currently the standard specification revision process continues.
  • LTE Long-term evolution
  • LTE Long Term Evolution
  • LTE next-generation technology
  • mobile communication operators need to deploy third-generation mobile communication networks to develop new services and improve their competitiveness.
  • the investment in deploying a mobile communication network is enormous.
  • the LTE network will not completely replace the original mobile communication network at the beginning, but coexist at the same time for a period of time, just like the third generation mobile communication network and the second generation mobile communication network. The same is true for coexistence.
  • LTE mobile communication equipment In order to protect the equipment, engineering and other investment protection of operators, LTE mobile communication equipment should have the ability to smoothly upgrade, and support the next-generation mobile communication technology with a minimum cost in a certain way (such as software upgrade).
  • the installation of base stations also accounts for a large part of the operator's investment. Therefore, when the network is upgraded to LTE, if the RF unit installed outdoors can be reused, it can save the operator a considerable investment in equipment installation.
  • the interface between the baseband unit and the radio frequency unit of the distributed base station of the TD-SCDMA system is defined in the "Ir interface technical requirements for distributed base stations of the 2GHz TD-SCDMA digital cellular mobile communication network" promulgated by the Ministry of Industry and Information Technology of the People's Republic of China. This interface is called the Ir interface.
  • the TD-SCDMA Ir interface supports line rates of 1228.8 Mbit/s and 2457.6 Mbit/s, or only 4195.2 Mbit/s line rate.
  • the above three line rates respectively provide data transmission capability of 3 sectors, 6 sectors and 12 sectors of the TD-SCDMA system, and each sector is configured with 8 antennas.
  • the rate, parameters, and data format of the TD-SCDMA Ir interface are completely designed according to the characteristics of TD-SCDMA.
  • the Ir interface cannot support data transmission between the BBU and the RRU of the LTE.
  • the LTE Ir interface supports line rates of 2457.6 Mbit/s, 4915.2 Mbit/s, and 9830.4 Mbit/s (optional).
  • the above three line rates respectively provide one sector and two antennas in the 20 MHz system bandwidth of the LTE system.
  • the rate, parameters, and data format of the LTE Ir interface are completely designed according to the characteristics of LTE. They are not compatible with the TD-SCDMA Ir interface. When deploying an LTE network, the existing TD-SDMA device resources of the operator cannot be effectively utilized.
  • the technical problem to be solved by the present invention is to provide a data transmission method between a baseband unit and a remote radio unit and a distributed base station, so as to overcome the disadvantage that the TD-SCDMA Ir interface is not compatible with the LTE Ir interface function.
  • a data transmission method between a baseband unit and a remote radio unit includes:
  • the baseband unit sends the network standard information of the cell to which the RRU belongs to the remote radio unit (RRU); the RRU learns the current network standard of the cell to which the cell belongs according to the received network standard information;
  • the data transmitting and receiving parties select the corresponding data transmission mode in the system for data transmission.
  • the step of the BBU transmitting the network standard information of the cell to which the RRU belongs to the RRU includes: the BBU transmitting the identifier information of the network standard of the cell to which the RRU belongs to the RRU, where the identifier information of the network standard is carried in Time division synchronous code division multiple access (TD-SCDMA) Ir interface physical layer control field;
  • TD-SCDMA Time division synchronous code division multiple access
  • the step of the RRU obtaining the current network of the cell to which the RRU belongs according to the received network standard information includes: the RRU knowing the current network system according to the received value of the identification information.
  • the identifier information When the value of the identifier information is equal to 0, it indicates that the current network is a TD-SCDMA network; when the value of the identifier information is equal to 1, it indicates that the current network is a Long Term Evolution Time Division Duplex (LTE TDD) network.
  • LTE TDD Long Term Evolution Time Division Duplex
  • the foregoing method may further have the following features: if, if it is determined that the current network belongs to the TD-SCDMA network, the data is transmitted according to the Ir interface technical requirement of the TD-SCDMA distributed base station; if it is determined that the current network belongs to the LTE TDD And transmitting the data according to a corresponding line rate selected according to the number of antennas between the BBU and the RRU.
  • the above method may also have the following features:
  • the selected line rate is 1228.8 Mbit/s
  • the selected line rate is 2457.6 Mbit/s
  • the selected line rate is 4915.2 Mbit/s
  • the line rate selected is 9830.4 Mbit/s.
  • the present invention further provides a distributed base station, including: a baseband unit (BBU) and a remote radio unit (RRU);
  • BBU baseband unit
  • RRU remote radio unit
  • the BBU is configured to send network standard information of the cell to which the RRU belongs to the RRU, and is also used to transmit data according to the corresponding data transmission mode in the process of transmitting data to the RRU through the Ir interface;
  • the RRU is configured to learn the current network format of the cell to which the cell belongs according to the received network standard information; and to use the data transmission mode corresponding to the standard data in the process of transmitting data to the BBU through the Ir interface. transmission.
  • the distributed base station may also have the following features:
  • the step of the BBU for sending the network standard information of the cell to which the RRU belongs to the RRU includes:
  • the BBU is configured to send, to the RRU, identifier information of a network standard of a cell to which the RRU belongs, where the identifier information of the network standard is carried in a physical layer control field of a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) Ir interface.
  • TD-SCDMA Time Division Synchronous Code Division Multiple Access
  • the step of the RRU for obtaining the current network of the cell to which the RMU belongs according to the received network standard information includes: the RRU is configured to learn the current network standard according to the received value of the identification information.
  • the distributed base station may also have the following features:
  • the identifier information When the value of the identifier information is equal to 0, it indicates that the current network is a TD-SCDMA network; when the value of the identifier information is equal to 1, it indicates that the current network is a Long Term Evolution Time Division Duplex (LTE TDD) network.
  • LTE TDD Long Term Evolution Time Division Duplex
  • the distributed base station may also have the following features:
  • the step of the BBU and/or the RRU for transmitting the data according to the corresponding data transmission mode in the system includes: if it is determined that the current network belongs to the TD-SCDMA network, the Ir is used according to the TD-SCDMA distributed base station
  • the interface technology requires a data transmission operation; if it is determined that the current network belongs to the LTE TDD, the data is transmitted according to a corresponding line rate selected according to the number of antennas between the BBU and the RRU.
  • the distributed base station may also have the following features:
  • the selected line rate is 1228.8 Mbit/s
  • the selected line rate is 2457.6 Mbit/s
  • the selected line rate is 4915.2 Mbit/s
  • the line rate selected is 9830.4 Mbit/s.
  • a data transmission method between a baseband unit and a remote radio unit includes:
  • the baseband unit sends network standard information of the cell to which the RRU belongs to the remote radio unit (RRU); the RRU learns the current network standard of the cell to which the cell belongs according to the network standard information;
  • the data transmitting and receiving parties select the corresponding data transmission mode in the system for data transmission.
  • the step of the BBU sending the network standard information of the cell to which the RRU belongs to the RRU includes: Sending, by the BBU, the identifier information of the network standard of the cell to which the RRU belongs to the RRU, where the identifier information of the network standard is carried in a physical layer control field of a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) Ir interface;
  • TD-SCDMA Time Division Synchronous Code Division Multiple Access
  • the step of the RRU obtaining the current network format of the cell to which the RRU belongs according to the received network standard information includes:
  • the RRU learns the current network standard according to the received value of the identification information.
  • the value of the identification information is equal to 0, and at this time, the standard is a TD-SCDMA network system; or
  • the value of the identifier information is equal to 1, and the system is a Long Term Evolution Time Division Duplex (LTE TDD) network standard.
  • the steps of the line transfer include:
  • Data transmitting and receiving parties that is, if the BBU and the RRU determine that the current network belongs to the TD-SCDMA network, the data is transmitted according to the Ir interface technical requirement of the TD-SCDMA distributed base station;
  • the data transmitting and receiving parties that is, the BBU and the RRU, if it is determined that the current network belongs to the LTE TDD, transmit the data according to a corresponding line rate selected according to the number of antennas between the BBU and the RRU.
  • the steps include:
  • the data rate of 1228.8 Mbit/s is selected for data transmission;
  • a distributed base station includes: a baseband unit (BBU) and a remote radio unit (RRU), wherein:
  • the BBU is configured to: send network standard information of the cell to which the RRU belongs to the RRU; and select data corresponding to the current network of the cell to which the RRU belongs in the process of transmitting data to the RRU through the Ir interface. Transmission method for data transmission;
  • the RRU is configured to: learn the system according to the received network standard information; and in the process of transmitting data to the BBU through the Ir interface, select a corresponding data transmission mode in the system for data transmission.
  • the BBU is configured to send network standard information of the cell to which the RRU belongs to the RRU according to the following manner:
  • TD-SCDMA Time Division Synchronous Code Division Multiple Access
  • the RRU is configured to learn the current network standard of the cell to which it belongs according to the received network standard information in the following manner: the RRU learns the current network standard according to the received value of the identification information.
  • the value of the identification information is equal to 0, and at this time, the standard is a TD-SCDMA network system; or
  • the value of the identifier information is equal to 1, and the system is a Long Term Evolution Time Division Duplex (LTE TDD) network standard.
  • LTE TDD Long Term Evolution Time Division Duplex
  • the BBU and/or the RRU are configured to transmit the data according to a corresponding data transmission mode in the following manner:
  • the data is transmitted according to the Ir interface technology requirement of the TD-SCDMA distributed base station;
  • the data is transmitted according to a corresponding line rate selected according to the number of antennas between the BBU and the RRU.
  • the BBU and/or the RRU are further configured to:
  • the data rate of 9830.4 Mbit/s is selected for data transmission.
  • FIG. 1 is a flowchart of overall processing of a distributed base station BBU and an RRU interface according to an embodiment of the present invention
  • FIG. 2 is a flow chart of data transmission between a BBU and an RRU interface in an LTE TDD system according to an embodiment of the present invention.
  • the TD-SCDMA Ir interface protocol of the "2GHz TD-SCDMA Digital Cellular Mobile Communication Network Distributed Base Station Ir Interface Technical Requirements" defines Layer 1 and Layer 2 protocols to support user layer data transmission, synchronization between BBU and RRU units, etc. Sending and receiving of information.
  • the user layer data is transmitted in the same phase and quadrature component (IQ, Inphase and Quadrature) data.
  • IQ, Inphase and Quadrature The IQ data of different antenna carriers (Antenna & Carrier) is transmitted in the optical transmission channel.
  • the Ir interface supports the Ethernet protocol to transmit C&M, Control and Maintain information.
  • the original TD-SCDMA Ir interface utilizes the characteristics of the TDD frame structure, and the LTE TDD has a similar frame structure as TD-SCDMA, the only difference is that the IQ data amount of the LTE TDD transmission is different from that of the TD-SCDMA, so The line rate supported by the RD-SCDMA Ir interface and The data format is extended, and a system identification information for identifying the system is distinguished to distinguish the system to be transmitted.
  • the Ir interface of TD-SCDMA can be extended to a multi-standard Ir interface capable of supporting LTE TDD.
  • each time slot is composed of a super group of 25 S durations, and each super group includes 32 groups. Each group consists of 24 words. Within a supergroup, the first byte of the first group is used as the synchronization word k28.5, and the second byte is transmitted SGN (Super-GroupNumber, super group number). Used to transmit user IQ quantized data.
  • SGN Super-GroupNumber, super group number
  • the LTE system bandwidth can be configured as follows: 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz, 20MHz, where the maximum bandwidth is 20MHz.
  • the line rate required to transmit IQ data for an antenna between the BBU and the RRU is:
  • 30.72X10 6 represents the sampling rate of the LTE system in the 20MHz system bandwidth
  • 16 x 2 means that the data I and Q each have 16 bits
  • 1.25 represents the line coding rate.
  • the line rate required to transmit the IQ data of the two antennas between the BBU and the RRU is: 2457.6 Mbit/s; the line rate required to transmit the IQ data of the four antennas between the BBU and the RRU is: 4915.2 Mbit/s; The line rate required to transmit IQ data of eight antennas between the BBU and the RRU is: 9830.4 Mbit/s
  • the present invention follows the structure of the group of the TD-SCDMA Ir interface at a line rate of 1228.8 Mbit/s, 2457.6 Mbit/s, and 4195.2 Mbit/s, and The line rate of 9830.4 Mbit/s and the structure of the group at each of the above new line rates are added.
  • TD-SCDMA Ir interface Since the TD-SCDMA Ir interface has defined 1228.8 Mbit/s, 2457.6 Mbit/s and
  • the line rate of 4915.2 Mbit/s can meet the data transmission requirements of 3 sectors, 6 sectors and 12 sectors of TD-SCDMA, and the BBU and RRU between 8 sectors of each sector. Therefore, a new increase is required.
  • the line rate of 9830.4 Mbit/s can satisfy 24 sectors of TD-SCDMA Ir interface, each fan The data transmission requirement between the BBU and the RRU of the area 8 antenna.
  • the base station uses an 8-antenna transceiver.
  • the interface between the BBU and the RRU can use a line rate.
  • a transmission line of 9830.4 Mbit/s, or a transmission line with a line rate of 4915.2 Mbit/s it is of course possible to use more low-rate transmission lines to carry the transmission of IQ data.
  • the carrier bandwidth is configured for the other types of bandwidths described above, the selection of the transmission line rate is analogous.
  • the extension method can be applied to "2GHz TD-SCDMA".
  • the physical layer control word defined in the Ir interface technical requirement of the distributed base station of the digital cellular mobile communication network is extended, and a system ID is added to the physical layer control word sent to the RRU by the BBU, and the SYSTEM ID is added to the system.
  • Different values of the IDs are used to distinguish whether the cell to which the RRU belongs belongs to the TD-SCDMA network or the LTE network, so as to achieve compatibility between the TD-SCDMA and the LTE system.
  • the compatibility with the original TD-SCDMA system is maintained, and the data transmission of the LTE TDD and the like can be supported, and the multiple modes can be simultaneously operated, that is, multi-mode operation.
  • the line rate and SYSTEM ID of the original TD-SCDMA Ir interface can be further extended to implement with other mobile communication systems (such as GSM (Global System for Mobile Communications), UMTS ( Universal Mobile Telecommunications System, Universal Mobile Telecommunications System, CDMA (Code Division Multiple Access, etc.) compatible.
  • GSM Global System for Mobile Communications
  • UMTS Universal Mobile Telecommunications System
  • Universal Mobile Telecommunications System Universal Mobile Telecommunications System
  • CDMA Code Division Multiple Access, etc.
  • the data transmission method between the baseband unit and the radio frequency unit in the distributed base station includes:
  • the BBU after establishing a connection with the RRU, the BBU sends the network standard information of the cell to which the RRU belongs to the RRU; the RRU learns the current network format of the cell to which the cell belongs according to the received network standard information;
  • the network standard information sent by the BBU to the RRU may be an extension of the control word in the TD-SCDMA Ir interface, and the first idle reserved byte of the TD-SCDMA Ir interface control field may be defined as indicating the network standard.
  • Identification information SYSTEM ID the value range of the identification information is 0 ⁇ 255.
  • the network standard of the cell can be known.
  • the BBU and the RRU use the corresponding data transmission mode under the standard system to transmit the data, including:
  • C&M data can be transmitted using the same C&M data transmission mechanism as TD-SCDMA. If it is determined that the current network belongs to another system, the Ir interface operation is extended according to the corresponding other system.
  • the distributed base station of the present invention includes: a BBU and an RRU, where:
  • the BBU is configured to: send the network standard information of the cell to which the RRU belongs to the RRU; and also use the corresponding data transmission mode in the system to perform data transmission during the process of transmitting data to the RRU through the Ir interface;
  • the RRU is configured to: learn the current network format of the cell to which the cell belongs according to the received network standard information; and also use the corresponding data transmission mode in the system to perform data transmission during the process of transmitting data to the BBU through the Ir interface.
  • the BBU is configured to send the network standard information of the cell to which the RRU belongs to the RRU according to the following manner:
  • the BBU sends the identifier information of the network standard of the cell to which the RRU belongs to the RRU, where the identifier information of the network standard is carried in a physical layer control field of a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) Ir interface;
  • TD-SCDMA Time Division Synchronous Code Division Multiple Access
  • the RRU is configured to learn the current network format of the cell to which it belongs according to the received network standard information in the following manner:
  • the RRU is configured to learn the current network standard according to the received value of the above identification information.
  • the value of the identification information When the value of the identification information is equal to 0, it may indicate that the current network is a TD-SCDMA network; when the value of the identification information is equal to 1, it may indicate that the current network is a Long Term Evolution Time Division Duplex (LTE TDD) network.
  • LTE TDD Long Term Evolution Time Division Duplex
  • the BBU and/or the RRU are configured to transmit the data according to a corresponding data transmission manner in the following manner: if it is determined that the current network belongs to the TD-SCDMA network, it is used for the TD-SCDMA distributed base station.
  • the Ir interface technology requires a data transmission operation; if it is determined that the current network belongs to the LTE TDD, the data is transmitted according to a corresponding line rate selected according to the number of antennas between the BBU and the RRU.
  • the selected line rate is 1228.8 Mbit/s
  • the line rate is 2457.6 Mbit/s.
  • the line rate is 4915.2 Mbit/s.
  • the line rate is 9830.4 Mbit/s.
  • Step 101 During the interface initialization process, the BBU sends the network standard information of the cell to which the RRU belongs to the RRU.
  • Step 102 The RRU learns, according to the received network standard information, a network standard of the cell to which the cell belongs.
  • the network standard information is represented by the value of the SYSTEM ID
  • the RRU judges the value of the SYSTEM ID. If the value of the SYSTEM ID is 0, it knows that the cell belongs to the TD-SCDMA network, and then follows the 2GHz TD. -SCDMA digital cellular mobile communication network distributed base station Ir interface technical requirements" data transmission operation (ie, transceiving operation); If the SYSTEM ID value is 1, then know that the cell belongs to the LTE network, then according to the The number of antennas between the BBU and the RRU is processed according to the data transmission process in the LTE TDD system. The process is described below, and will not be described here. If the SYSTEM ID is other values, Corresponding extended process processing;
  • Step 103 the process ends.
  • the data transmission process between the distributed base station BBU and the RRU in the LTE TDD system includes step 201-step 219:
  • Step 201 the processing flow is started
  • Step 206 filling the I data into the Ir interface data address Addr;
  • Step 208 filling the Q data into the Ir interface data address Addr;
  • Step 211 Determine whether the I/Q data sample value of one antenna of one sector is not transmitted, that is, determine whether S is smaller than a maximum value Smax of data amount that can be transmitted by each antenna of each sector; if S ⁇ Smax is established , the description is not passed, go to step 206; otherwise the instructions have been transferred, go to step 212;
  • Step 213 determining whether the I/Q data of all antennas of a sector has not been transmitted, that is, determining A is less than the total number of antennas Amax in each sector; if A ⁇ Amax is established, the description is not passed, go to step 205; otherwise the description has been passed, go to step 214;
  • Step 215 Determine whether the I/Q data samples of all the antennas of all the sectors are not transmitted, that is, whether C is smaller than the total number of sectors Cmax between the BBU and the RRU; if C ⁇ Cmax is established, it indicates that the transmission is not completed. Proceed to step 204; otherwise, the description has been passed, and the process proceeds to step 216.
  • Step 216 the end.
  • the Ir interface compatibility of various mobile communication systems has been improved, and the effect of a common unified Ir interface of the mobile communication system is achieved, which saves the investment of the operator to deploy equipment and engineering installation. Therefore, the present invention has strong industrial applicability.

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Abstract

一种基带单元与远端射频单元间的数据传输方法及分布式基站,所述分布式基站包括:基带单元(BBU)和远端射频单元(RRU);所述方法包括:BBU向RRU发送该RRU所属小区的网络制式信息;RRU根据接收到的网络制式信息获知其所属小区的当前网络的制式;在该BBU与RRU间通过Ir接口传输数据的过程中,数据收发双方选用该制式下相应的数据传输方式进行数据传输。采用上述技术方案后,取得了多种移动通信制式的Ir接口兼容的进步,达到了多种移动通信制式公用统一的Ir接口的效果,节省了运营商部署设备、工程安装的投资。

Description

基带单元与远端射频单元间的数据传输方法及分布式基站
技术领域
本发明涉及蜂窝移动通讯领域, 尤其涉及一种基带单元与远端射频单元 间的数据传输方法及分布式基站。
背景技术
传统基站的基带部分与射频部分一同安装在一个机拒内。 通常, 机拒放 置在室内机房, 天线架设在室外的铁塔、 抱杆等较高位置, 射频部分输入、 输出的射频信号通过馈缆连接到天线。
分布式基站是把传统宏基站划分为基带处理单元和射频处理单元两个部 分,基带单元(BBU, Base Band Unit )与远端射频单元(RRU, Remote Radio Unit )二者之间通过接口相连, 实现了基带单元与远端射频单元分离的结构。 这种结构的基站与传统基站相比, 射频单元更接近天线, 可以减少射频信号 的损耗、 降低馈缆与天线连接的施工难度。
时分同步码分多址 ( TD-SCDMA , Time Division- Synchronous Code Division Multiple Access )是第三代移动通信标准之一。 第三代移动通信在中 国开始商用的同时, 移动通信技术也在不断向前发展。 目前正在开发的新一 代移动通信技术与第三代移动通信技术相比, 具有数据传输速率更高, 频谱 利用率更高、 时延更小等优点。 国际移动通信标准化组织第三代移动通信合 作伙伴计划 (3GPP, 3rd Generation Partnership Project ) 已经发布了长期演进 ( LTE, Long Term Evolution )技术规范, 目前该标准规范仍在不断修订的过 程中。 作为第三代移动通信的演进技术, 预计 LTE在 2010年开始进入预商 用阶段。 LTE有两种双工模式: 频分双工(FDD, Frequency Division Duplex ) 和时分双工 (TDD, Time Division Duplex ) , 其中 TDD LTE是 TD-SCDMA 的演进版本。
根据移动通信技术的发展规律, 新一代的移动通信技术最初的技术规范 还很不完善, 必须经过一个试用阶段, 在试用的过程中逐步完善, 等到成熟 后才能具备大规模商用的能力, 这个过程一般需要几年的时间。 在新一代技 术 LTE部署前,移动通信运营商需要部署第三代移动通信网络来发展新业务, 提高竟争力。 而部署一张移动通信网络的投资是十分巨大的。 此外, 为了保 证通信网络服务的连续性, LTE网络初期不会完全替代原有的移动通信网络, 而是在一段时期内同时共存, 就如同第三代移动通信网络和第二代移动通信 网络目前共存的情况一样。
出于对运营商的设备、 工程等投资保护的需要, LTE移动通信设备应具 备平滑升级的能力, 通过某种方式(如软件升级等) 以最小的代价升级支持 新一代移动通信技术。 此外,基站的安装工程也占运营商投资的很大一部分, 因此, 在网络升级到 LTE时, 如果能重用室外安装的射频单元, 就可以为运 营商节省可观的设备安装投资。
中华人民共和国工业和信息化部发布的 《2GHz TD-SCDMA数字蜂窝移 动通信网 分布式基站的 Ir接口技术要求》中规定了 TD-SCDMA***分布式 基站的基带单元与射频单元之间的接口, 该接口称为 Ir接口。 TD-SCDMA Ir 接口支持 1228.8 Mbit/s和 2457.6 Mbit/s的线速率, 或仅支持 4195.2Mbit/s线 速率。 上述 3种线速率分别提供 TD-SCDMA***的 3扇区、 6扇区和 12扇 区的数据传输能力,每个扇区配置 8个天线。但该 TD-SCDMA Ir接口的速率、 参数、数据格式等完全是根据 TD-SCDMA的特点设计的, 当网络升级到 LTE 后, 该 Ir接口不能支持 LTE的 BBU和 RRU之间的数据传输。
由中国通信标准化协会制定的 《LTE蜂窝移动通信网分布式基站 Ir接口 技术要求》规定了 LTE***分布式基站的基带单元与射频单元之间的接口, 该接口也称为 Ir接口。 该 LTE Ir接口支持 2457.6 Mbit/s、 4915.2 Mbit/s、 9830.4Mbit/s(可选)的线速率,上述 3种线速率分别提供了 LTE***的 20MHz ***带宽下的 1扇区 2个天线、 1扇区 4个天线、 1扇区 8个天线的数据传输 能力。 该 LTE Ir接口的速率、 参数、 数据格式等完全是根据 LTE的特点设计 的, 与 TD-SCDMA Ir接口不能兼容, 当部署 LTE网络时, 不能有效利用运 营商现有的 TD-SDMA设备资源。
发明内容 本发明所要解决的技术问题是提供一种基带单元与远端射频单元间的数 据传输方法及分布式基站, 以克服的 TD-SCDMA Ir接口不兼容 LTE Ir接口 功能的缺点。
为解决上述问题, 一种基带单元与远端射频单元间的数据传输方法, 包 括:
所述基带单元( BBU )向所述远端射频单元( RRU )发送该 RRU所属小 区的网络制式信息;所述 RRU根据接收到的网络制式信息获知其所属小区的 当前网络的制式;
在所述 BBU与 RRU间通过 Ir接口传输数据的过程中, 数据收发双方选 用该制式下相应的数据传输方式进行数据传输。
其中, 上述方法还可具有以下特征:
所述 BBU向所述 RRU发送该 RRU所属小区的网络制式信息的步骤包 括: 所述 BBU向所述 RRU发送该 RRU所属小区的网络制式的标识信息,其 中, 所述网络制式的标识信息携带在时分同步码分多址(TD-SCDMA ) Ir 接口的物理层控制字段中;
所述 RRU根据接收到的网络制式信息获知其所属小区的当前网络的制 式的步骤包括:所述 RRU根据接收到的所述标识信息的值获知当前网络的制 式。
其中, 上述方法还可具有以下特征:
当所述标识信息的值等于 0时,表示当前网络为 TD-SCDMA网络; 当所 述标识信息的值等于 1时, 表示当前网络为长期演进时分双工 (LTE TDD ) 网络。
其中, 上述方法还可具有以下特征: 括: 如判断出当前网络属于 TD-SCDMA网络, 则按照 TD-SCDMA分布式基 站的 Ir接口技术要求对数据进行传输操作;如判断出当前网络属于 LTE TDD , 则按照根据所述 BBU与 RRU之间的天线数量选用的相应的线速率对所述数 据进行传输。 其中, 上述方法还可具有以下特征:
当所述 BBU与 RRU之间的天线数量为 1 时, 选用的线速率为 1228.8 Mbit/s;
当所述 BBU与 RRU之间的天线数量为 2时, 选用的线速率为 2457.6 Mbit/s;
当所述 BBU与 RRU之间的天线数量为 4时, 选用的线速率为 4915.2 Mbit/s;
当所述 BBU与 RRU之间的天线数量为 8时, 选用的线速率为 9830.4 Mbit/s„
为解决上述问题, 本发明还提供了一种分布式基站, 包括: 基带单元 ( BBU )和远端射频单元(RRU ) ;
所述 BBU用于向所述 RRU发送该 RRU所属小区的网络制式信息;还用 于在通过 Ir接口向所述 RRU传输数据的过程中,选用该制式下相应的数据传 输方式进行数据传输;
所述 RRU用于根据接收到的网络制式信息获知其所属小区的当前网络 的制式;还用于在通过 Ir接口向所述 BBU传输数据的过程中,选用该制式下 相应的数据传输方式进行数据传输。
其中, 上述分布式基站还可具有以下特征:
所述 BBU用于向所述 RRU发送该 RRU所属小区的网络制式信息的步骤 包括:
所述 BBU用于向所述 RRU发送该 RRU所属小区的网络制式的标识信 息, 其中, 所述网络制式的标识信息携带在时分同步码分多址(TD-SCDMA ) Ir接口的物理层控制字段中;
所述 RRU用于根据接收到的网络制式信息获知其所属小区的当前网络 的制式的步骤包括:所述 RRU用于根据接收到的所述标识信息的值获知当前 网络的制式。 其中, 上述分布式基站还可具有以下特征:
当所述标识信息的值等于 0时,表示当前网络为 TD-SCDMA网络; 当所 述标识信息的值等于 1时, 表示当前网络为长期演进时分双工 (LTE TDD ) 网络。
其中, 上述分布式基站还可具有以下特征:
所述 BBU和 /或 RRU用于选用该制式下相应的数据传输方式对上述数据 进行传输的步骤包括:如判断出当前网络属于 TD-SCDMA网络,则用于按照 TD-SCDMA分布式基站的 Ir接口技术要求对数据进行传输操作;如判断出当 前网络属于 LTE TDD ,则用于按照根据所述 BBU与 RRU之间的天线数量选 用的相应的线速率对所述数据进行传输。
其中, 上述分布式基站还可具有以下特征:
当所述 BBU与 RRU之间的天线数量为 1 时, 选用的线速率为 1228.8 Mbit/s;
当所述 BBU与 RRU之间的天线数量为 2时, 选用的线速率为 2457.6 Mbit/s;
当所述 BBU与 RRU之间的天线数量为 4时, 选用的线速率为 4915.2 Mbit/s;
当所述 BBU与 RRU之间的天线数量为 8时, 选用的线速率为 9830.4 Mbit/s„
一种基带单元与远端射频单元间的数据传输方法, 包括:
所述基带单元( BBU )向所述远端射频单元( RRU )发送该 RRU所属小 区的网络制式信息;所述 RRU才艮据所述网络制式信息获知其所属小区的当前 网络的制式;
在所述 BBU与 RRU间通过 Ir接口传输数据的过程中, 数据收发双方选 用所述制式下相应的数据传输方式进行数据传输。
其中:所述 BBU向所述 RRU发送该 RRU所属小区的网络制式信息的步 骤包括: 所述 BBU向所述 RRU发送该 RRU所属小区的网络制式的标识信息,其 中, 所述网络制式的标识信息携带在时分同步码分多址(TD-SCDMA ) Ir 接口的物理层控制字段中;
所述 RRU根据接收到的网络制式信息获知其所属小区的当前网络的制 式的步骤包括:
所述 RRU根据接收到的所述标识信息的值获知当前网络的制式。
其中: 所述标识信息的值等于 0, 此时, 所述制式为 TD-SCDMA网络制 式; 或者,
所述标识信息的值等于 1 , 此时, 所述制式为长期演进时分双工 (LTE TDD ) 网络制式。 行传输的步骤包括:
数据收发双方, 即所述 BBU 和所述 RRU 如判断出当前网络属于 TD-SCDMA网络, 则按照 TD-SCDMA分布式基站的 Ir接口技术要求对数据 进行传输操作;
数据收发双方, 即所述 BBU和所述 RRU如判断出当前网络属于 LTE TDD, 则按照根据所述 BBU与 RRU之间的天线数量选用的相应的线速率对 所述数据进行传输。 的步骤包括:
当所述 BBU与 RRU之间的天线数量为 1时, 选用 1228.8 Mbit/s的线速 率进行数据传输;
当所述 BBU与 RRU之间的天线数量为 2时, 选用 2457.6 Mbit/s的线速 率进行数据传输;
当所述 BBU与 RRU之间的天线数量为 4时, 选用 4915.2 Mbit/s的线速 率进行数据传输;
当所述 BBU与 RRU之间的天线数量为 8时, 选用 9830.4 Mbit/s的线速 率进行数据传输。 一种分布式基站, 包括: 基带单元(BBU )和远端射频单元(RRU ) , 其中:
所述 BBU设置成: 向所述 RRU发送该 RRU所属小区的网络制式信息; 还在通过 Ir接口向所述 RRU传输数据的过程中, 选用所述 RRU所属小区的 当前网络的制式下相应的数据传输方式进行数据传输;
所述 RRU设置成: 根据接收到的网络制式信息获知所述制式; 还在通过 Ir接口向所述 BBU传输数据的过程中,选用所述制式下相应的数据传输方式 进行数据传输。
其中:所述 BBU设置成按照以下方式向所述 RRU发送该 RRU所属小区 的网络制式信息:
所述 BBU向所述 RRU发送该 RRU所属小区的网络制式的标识信息 ,其 中, 所述网络制式的标识信息携带在时分同步码分多址(TD-SCDMA ) Ir 接口的物理层控制字段中;
所述 RRU设置成按照以下方式根据接收到的网络制式信息获知其所属 小区的当前网络的制式:所述 RRU根据接收到的所述标识信息的值获知当前 网络的制式。
其中: 所述标识信息的值等于 0, 此时, 所述制式为 TD-SCDMA网络制 式; 或者,
所述标识信息的值等于 1 , 此时, 所述制式为长期演进时分双工 (LTE TDD ) 网络制式。
其中: 所述 BBU和 /或所述 RRU设置成按照以下方式选用所述制式下相 应的数据传输方式对上述数据进行传输:
如判断出当前网络属于 TD-SCDMA网络, 则按照 TD-SCDMA分布式基 站的 Ir接口技术要求对数据进行传输操作;
如判断出当前网络属于 LTE TDD ,则按照根据所述 BBU与 RRU之间的 天线数量选用的相应的线速率对所述数据进行传输。
其中: 所述 BBU和 /或所述 RRU还设置成:
当所述 BBU与 RRU之间的天线数量为 1时, 选用 1228.8 Mbit/s的线速 率进行数据传输;
当所述 BBU与 RRU之间的天线数量为 2时, 选用 2457.6 Mbit/s的线速 率进行数据传输;
当所述 BBU与 RRU之间的天线数量为 4时, 选用 4915.2 Mbit/s的线速 率进行数据传输;
当所述 BBU与 RRU之间的天线数量为 8时, 选用 9830.4 Mbit/s的线速 率进行数据传输。
釆用上述技术方案后, 取得了多种移动通信制式的 Ir接口兼容的进步, 达到了多种移动通信制式公用统一的 Ir接口的效果,节省了运营商部署设备、 工程安装的投资。 附图概述
图 1 是本发明实施例中分布式基站 BBU与 RRU接口总体处理流程图; 图 2 是本发明实施例中 LTE TDD制式下的 BBU与 RRU接口的数据传 输流程图。 本发明的较佳实施方式
下面结合附图对技术方案的实施作进一步的详细描述:
«2GHz TD-SCDMA数字蜂窝移动通信网 分布式基站的 Ir接口技术要 求》 的 TD-SCDMA Ir接口协议定义了层一和层二协议来支持用户层数据传 输、 BBU和 RRU单元间同步数据等控制信息的发送和接收。 用户层的数据 是以同相和正交分量( IQ , Inphase and Quadrature )数据的方式发送的, 不同 天线载波(Antenna & Carrier ) 的 IQ数据分时在光传输通道中传输。 Ir接口 支持以太网( Ethernet )协议来传送控制与维护( C&M, Control and Maintain ) 信息。
由于原 TD-SCDMA的 Ir接口利用了 TDD帧结构的特点, 而 LTE TDD 具有与 TD-SCDMA类似的帧结构, 区别仅在于 LTE TDD传输的 IQ数据量 与 TD-SCDMA不同,因此可通过对原 TD-SCDMA的 Ir接口支持的线速率及 数据格式进行扩展, 同时增加一个用以标识制式的***标识信息来区分待传 输数据的制式,就可以将 TD-SCDMA的 Ir接口扩展成可以支持 LTE TDD的 多制式 Ir接口。
在《2GHz TD-SCDMA数字蜂窝移动通信网 分布式基站的 Ir接口技术 要求》 的基础上, 定义了 TD-SCDMA用户层 IQ数据和 C&M控制信息的传 输结构。 在 TD-SCDMA ***中, 每个时隙由多个 25 S 时长的超组 ( Super-Group )组成, 每个超组中包括 32个组( Group )。 每个组由 24个字 组成, 在一个超组内, 第一个组的第一个字节作为同步字 k28.5, 第二个字节 传送 SGN ( Super-GroupNumber, 超组号) , 其余的用来传送用户 IQ量化数 据。
LTE***带宽可以配置为以下几种: 1.4MHz、 3MHz、 5MHz、 10MHz、 15MHz、 20MHz, 其中最大带宽是 20MHz。 对于 20MHz***带宽的 LTE系 统来说, 在 BBU与 RRU之间传输一个天线的 IQ数据需要的线速率为:
30.72xl06 xl6x2xl.25 = 1228.8Mbit/s
其中, 30.72X106表示 20MHz***带宽下 LTE***的釆样速率, 16 x 2表 示数据 I和 Q各有 16bit, 1.25表示线路编码速率。
则在 BBU与 RRU之间传输二个天线的 IQ数据需要的线速率为: 2457.6 Mbit/s;在 BBU与 RRU之间传输四个天线的 IQ数据需要的线速率为: 4915.2 Mbit/s;在 BBU与 RRU之间传输八个天线的 IQ数据需要的线速率为: 9830.4 Mbit/s„
因此, 为了使 Ir接口兼容 TD-SCDMA Ir接口与 LTE TDD Ir接口, 本发 明沿用 TD-SCDMA Ir接口在 1228.8 Mbit/s, 2457.6 Mbit/s, 4195.2 Mbit/s线 速率下的组的结构, 并增加了 9830.4 Mbit/s的线速率以及在上述各新增线速 率下的组的结构。
由于 TD-SCDMA Ir接口已经定义了 1228.8 Mbit/s 、 2457.6 Mbit/s和
4915.2 Mbit/s的线速率, 分别能满足 TD-SCDMA的 3个扇区、 6个扇区、 12 个扇区, 每个扇区 8天线的 BBU与 RRU间的数据传输需求, 因此, 新增加 的 9830.4 Mbit/s的线速率可以满足 TD-SCDMA Ir接口的 24个扇区、 每个扇 区 8天线的 BBU与 RRU间的数据传输需求。
根据前述分析, 当 LTE TDD***配置了 20MHz载波带宽时, 基站釆用 8天线的收发信机, 为了满足 BBU与 RRU之间传输 IQ数据需要, BBU与 RRU之间的接口可以釆用一条线路速率为 9830.4 Mbit/s的传输线路,或两条 线路速率为 4915.2 Mbit/s的传输线路, 当然以可以以此类推, 釆用更多的低 速率传输线路来承载 IQ数据的传输。当载波带宽配置为前述的其它几种带宽 时, 传输线路速率的选择以此类推。
此外, 为了区分传输数据的制式(即确定传输的数据属于 TD-SCDMA 还是 LTE ) , 在上述 TD-SCDMA Ir接口协议的基础上, 将其进行扩展, 扩展 方法可釆用对《2GHz TD-SCDMA数字蜂窝移动通信网 分布式基站的 Ir接 口技术要求》 中定义的物理层控制字进行扩展, 在 BBU发给 RRU的物理层 控制字中增加一个用于表示网络制式的标识信息 SYSTEM ID,通过 SYSTEM ID的不同取值来区分该 RRU所属小区属于 TD-SCDMA网络还是 LTE网络, 以实现 TD-SCDMA与 LTE***的兼容。 通过该新增加的标识信息, 保持了 与原有 TD-SCDMA***的兼容, 且能支持 LTE TDD等制式的数据传输, 在 支持的同时还可保证多种制式同时运行, 即多模式运行。
根据上述分析可知,还可以对原 TD-SCDMA Ir接口的线速率及 SYSTEM ID进行进一步扩展,以实现与其它的移动通信***(例如 GSM( Global System for Mobile Communications, 全球移动通讯***) 、 UMTS ( Universal Mobile Telecommunications System , 通用移动通信***) 、 CDMA ( Code Division Multiple Access, 码分多址)等) 的兼容。
综上所述, 本发明实施例的分布式基站中基带单元与射频单元间的数据 传输方法, 包括:
1 ) BBU在与 RRU建立连接后,向该 RRU发送该 RRU所属小区的网络 制式信息; RRU根据接收到的网络制式信息获知其所属小区的当前网络的制 式;
其中, BBU向 RRU发送的网络制式信息可以是对 TD-SCDMA Ir接口中 控制字的扩展,即可将 TD-SCDMA Ir接口控制字段的第一个空闲保留字节定 义为用于表示网络制式的标识信息 SYSTEM ID, 该标识信息的取值范围 0 ~ 255。对于 TD-SCDMA网络, SYSTEM ID=0; 对于 LTE TDD网络, SYSTEM ID=1 ;该定义方法不能作为本发明的限定,定义为其它值亦可,只要保证 RRU 能够根据接收到的 SYSTEM ID的值获知所述小区的网络制式即可。
此外,还可对 SYSTEM ID的值进行进一步扩展,例如,对于 GSM网络, SYSTEM ID=2; 对于 LTE FDD ( Frequency Division Duplexing, 频分双工) 网络, SYSTEM ID=3; 对于 UMTS网络, SYSTEM ID=4; 对于 CDMA网络, SYSTEM ID=5; 对于 WiMAX ( Worldwide Interoperability for Microwave Access, 全球微波互联接入)网络, SYSTEM ID=6; 除了此处举例的扩展夕卜, 还可以进一步扩展以支持更多的网络制式。
2 ) 在 BBU与 RRU间通过 Ir接口传输数据的过程中 , BBU和 RRU选用 该制式下相应的数据传输方式对上述数据进行传输, 包括:
如判断出当前所在小区的网络属于 TD-SCDMA, 则可按照 《2GHz TD-SCDMA数字蜂窝移动通信网 分布式基站的 Ir接口技术要求》对数据进 行传输操作; 如判断出当前所在小区的网络属于 LTE TDD, 则按照根据该 BBU与 RRU之间的天线数量选用的相应的线速率, 在每个组内传输一个组 周期 Tc=l/1.28MHz=781.25ns (其中, 1.28MHz是 TD-SCDMA的码片速率) 时间内的 LTE TDD的 IQ数据和 C&M数据。由于 LTE TDD的无线帧结构与 TD-SCDMA类似, 因此可以釆用与 TD-SCDMA相同的 C&M数据传输机制 对 C&M数据进行传输。 如果判断出当前网络属于其它制式, 则按照相对应 的其它***扩展 Ir接口操作。
本发明所述分布式基站, 包括: BBU和 RRU, 其中:
BBU设置成: 向 RRU发送该 RRU所属小区的网络制式信息; 还用于在 通过 Ir接口向 RRU传输数据的过程中,选用该制式下相应的数据传输方式进 行数据传输;
RRU设置成: 根据接收到的网络制式信息获知其所属小区的当前网络的 制式;还用于在通过 Ir接口向 BBU传输数据的过程中,选用该制式下相应的 数据传输方式进行数据传输。 其中, BBU设置成按照以下方式向 RRU发送该 RRU所属小区的网络制 式信息:
BBU向 RRU发送该 RRU所属小区的网络制式的标识信息, 其中, 该网 络制式的标识信息携带在时分同步码分多址( TD-SCDMA ) Ir接口的物理层 控制字段中;
RRU设置成按照以下方式根据接收到的网络制式信息获知其所属小区 的当前网络的制式: RRU用于根据接收到的上述标识信息的值获知当前网络 的制式。
当标识信息的值等于 0时,可表示当前网络为 TD-SCDMA网络; 当该标 识信息的值等于 1时, 可表示当前网络为长期演进时分双工 (LTE TDD ) 网 络。
优选地, BBU和 /或 RRU设置成按照以下方式选用该制式下相应的数据 传输方式对上述数据进行传输:如判断出当前网络属于 TD-SCDMA网络,则 用于按照 TD-SCDMA分布式基站的 Ir接口技术要求对数据进行传输操作; 如判断出当前网络属于 LTE TDD ,则按照根据 BBU与 RRU之间的天线数量 选用的相应的线速率对所述数据进行传输。
其中, 当 BBU与 RRU之间的天线数量为 1时, 选用的线速率为 1228.8 Mbit/s;
当 BBU与 RRU之间的天线数量为 2时,选用的线速率为 2457.6 Mbit/s; 当 BBU与 RRU之间的天线数量为 4时,选用的线速率为 4915.2 Mbit/s; 当 BBU与 RRU之间的天线数量为 8时,选用的线速率为 9830.4 Mbit/s„
下面用本发明的一个应用实例对本发明进行进一步说明。
如图 1所示, 包括以下步骤:
步骤 101 , 在接口初始化过程中, BBU向 RRU发送该 RRU所属小区的 网络制式信息;
步骤 102, RRU根据接收到的网络制式信息获知所属小区的网络制式; 当网络制式信息通过 SYSTEM ID取值来表示时, RRU对 SYSTEM ID的取 值进行判断, 如果 SYSTEM ID的取值为 0, 则获知所属小区为 TD-SCDMA 网络, 则在后续可按照《2GHz TD-SCDMA数字蜂窝移动通信网 分布式基站 的 Ir接口技术要求》对数据进行传输操作 (即收发操作 ); 如果 SYSTEM ID 的取值为 1 , 则获知所属小区为 LTE网络, 则在后续可根据该 BBU与 RRU 之间的天线数量选用相应的线速率、按照 LTE TDD制式下的数据传输流程进 行处理, 该流程在下文进行说明, 此处不再进行赘述; 如果 SYSTEM ID取 值为其它值, 按照相应的扩展流程处理;
步骤 103 , 处理结束。
如图 2所示, LTE TDD制式下的分布式基站 BBU与 RRU间的数据传输 流程包括步骤 201-步骤 219:
步骤 201 , 处理流程启动;
步骤 202 , 初始化 Ir接口数据地址 Addr=0;
步骤 203 , 初始化扇区数 C=0;
步骤 204, 初始化每个扇区的天线数 A=0;
步骤 205, 初始化每个扇区的每个天线的 I/Q数据的釆样值数 S=0;
步骤 206, 将 I数据填入 Ir接口数据地址 Addr;
步骤 207 , Ir接口数据地址递增 Addr=Addr+ 1;
步骤 208, 将 Q数据填入 Ir接口数据地址 Addr;
步骤 209 , Ir接口数据地址递增 Addr=Addr+ 1;
步骤 210, I/Q数据的釆样值数递增 S=S+1 ;
步骤 211 , 判断一个扇区一个天线的 I/Q数据釆样值是否未传完, 即判断 S是否小于每一扇区每一天线所能传输的数据量的最大值 Smax;如果 S<Smax 成立, 则说明未传完, 转入步骤 206; 否则说明已传完, 转入步骤 212;
步骤 212, 天线数递增 A=A+1 ;
步骤 213 , 判断一个扇区所有天线的 I/Q数据釆样值是否未传完, 即判断 A是否小于每一扇区内的天线总数 Amax; 如果 A<Amax成立, 则说明未传 完, 转入步骤 205; 否则说明已传完, 转入步骤 214;
步骤 214, 扇区数递增 C=C+1 ;
步骤 215, 判断所有扇区所有天线的 I/Q数据釆样值是否未传完, 即判断 C是否小于 BBU与 RRU间的扇区总数 Cmax; 如果 C<Cmax成立,则说明未 传完, 转入步骤 204; 否则说明已传完, 转入步骤 216
步骤 216, 结束。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成, 所述程序可以存储于计算机可读存储介质中, 如只读 存储器、 磁盘或光盘等。 可选地, 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地, 上述实施例中的各模块 /单元可以釆用 硬件的形式实现, 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。
工业实用性
釆用上述技术方案后, 取得了多种移动通信制式的 Ir接口兼容的进步, 达到了多种移动通信制式公用统一的 Ir接口的效果,节省了运营商部署设备、 工程安装的投资。 因此本发明具有很强的工业实用性。

Claims

权 利 要 求 书
1、 一种基带单元与远端射频单元间的数据传输方法, 包括:
所述基带单元( BBU )向所述远端射频单元( RRU )发送该 RRU所属小 区的网络制式信息;所述 RRU才艮据所述网络制式信息获知其所属小区的当前 网络的制式;
在所述 BBU与 RRU间通过 Ir接口传输数据的过程中, 数据收发双方选 用所述制式下相应的数据传输方式进行数据传输。
2、 如权利要求 1所述的数据传输方法, 其中: 所述 BBU向所述 RRU发 送该 RRU所属小区的网络制式信息的步骤包括:
所述 BBU向所述 RRU发送该 RRU所属小区的网络制式的标识信息,其 中, 所述网络制式的标识信息携带在时分同步码分多址(TD-SCDMA ) Ir 接口的物理层控制字段中;
所述 RRU根据接收到的网络制式信息获知其所属小区的当前网络的制 式的步骤包括:
所述 RRU根据接收到的所述标识信息的值获知当前网络的制式。
3、 如权利要求 2所述的数据传输方法, 其中:
所述标识信息的值等于 0, 此时, 所述制式为 TD-SCDMA网络制式; 或 者,
所述标识信息的值等于 1 , 此时, 所述制式为长期演进时分双工 (LTE TDD ) 网络制式。
4、 如权利要求 1所述的数据传输方法, 其中: 数据收发双方选用所述制 数据收发双方, 即所述 BBU 和所述 RRU 如判断出当前网络属于 TD-SCDMA网络, 则按照 TD-SCDMA分布式基站的 Ir接口技术要求对数据 进行传输操作;
数据收发双方, 即所述 BBU和所述 RRU如判断出当前网络属于 LTE TDD, 则按照根据所述 BBU与 RRU之间的天线数量选用的相应的线速率对 所述数据进行传输。
5、 如权利要求 4所述的数据传输方法, 其中, 数据收发双方选用所述制 式下相应的数据传输方式进行数据传输的步骤包括:
当所述 BBU与 RRU之间的天线数量为 1时, 选用 1228.8 Mbit/s的线速 率进行数据传输;
当所述 BBU与 RRU之间的天线数量为 2时, 选用 2457.6 Mbit/s的线速 率进行数据传输;
当所述 BBU与 RRU之间的天线数量为 4时, 选用 4915.2 Mbit/s的线速 率进行数据传输;
当所述 BBU与 RRU之间的天线数量为 8时, 选用 9830.4 Mbit/s的线速 率进行数据传输。
6、 一种分布式基站, 包括: 基带单元( BBU )和远端射频单元( RRU ) , 其中:
所述 BBU设置成: 向所述 RRU发送该 RRU所属小区的网络制式信息; 还在通过 Ir接口向所述 RRU传输数据的过程中, 选用所述 RRU所属小区的 当前网络的制式下相应的数据传输方式进行数据传输;
所述 RRU设置成: 根据接收到的网络制式信息获知所述制式; 还在通过 Ir接口向所述 BBU传输数据的过程中,选用所述制式下相应的数据传输方式 进行数据传输。
7、 如权利要求 6所述的分布式基站, 其中: 所述 BBU设置成按照以下 方式向所述 RRU发送该 RRU所属小区的网络制式信息:
所述 BBU向所述 RRU发送该 RRU所属小区的网络制式的标识信息 ,其 中, 所述网络制式的标识信息携带在时分同步码分多址(TD-SCDMA ) Ir 接口的物理层控制字段中;
所述 RRU设置成按照以下方式根据接收到的网络制式信息获知其所属 小区的当前网络的制式:所述 RRU根据接收到的所述标识信息的值获知当前 网络的制式。
8、 如权利要求 7所述的分布式基站, 其中: 所述标识信息的值等于 0, 此时, 所述制式为 TD-SCDMA网络制式; 或 者,
所述标识信息的值等于 1 , 此时, 所述制式为长期演进时分双工 (LTE TDD ) 网络制式。
9、 如权利要求 6所述的分布式基站, 其中: 所述 BBU和 /或所述 RRU 输:
如判断出当前网络属于 TD-SCDMA网络, 则按照 TD-SCDMA分布式基 站的 Ir接口技术要求对数据进行传输操作;
如判断出当前网络属于 LTE TDD ,则按照根据所述 BBU与 RRU之间的 天线数量选用的相应的线速率对所述数据进行传输。
10、 如权利要求 9所述的分布式基站, 其中: 所述 BBU和 /或所述 RRU 还设置成:
当所述 BBU与 RRU之间的天线数量为 1时, 选用 1228.8 Mbit/s的线速 率进行数据传输;
当所述 BBU与 RRU之间的天线数量为 2时, 选用 2457.6 Mbit/s的线速 率进行数据传输;
当所述 BBU与 RRU之间的天线数量为 4时, 选用 4915.2 Mbit/s的线速 率进行数据传输;
当所述 BBU与 RRU之间的天线数量为 8时, 选用 9830.4 Mbit/s的线速 率进行数据传输。
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