WO2011009245A1

WO2011009245A1 - Multimode base station, radio frequency unit and realization method thereof

Info

Publication number: WO2011009245A1
Application number: PCT/CN2009/074074
Authority: WO
Inventors: 杨朝晖
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-07-23
Filing date: 2009-09-21
Publication date: 2011-01-27
Also published as: CN101965070A; CN101965070B

Abstract

A radio frequency unit for mobile communication multiple network modes and realization method thereof are provided. By displacing the main control function of the radio frequency part of the base station in the prior art from a base band unit (BBU) to a radio frequency unit (RRU), and by standardizing the baseband-radiofrequency interfaces and improving the intellectualized management degree of the RRU, the RRU of the present invention can be compatible with BBUs of the different device manufacturers, and support the interconnection between the RRU of the present invention and the BBUs of the different device manufacturers. When a multimode base station is introduced, only a primary RRU of an operator needs to be replaced, and a primary BBU of the operator does not need to be replaced, therefore the stock cost of the operator is decreased effectively and the service continuation is kept by the present invention based on non-changing the present network device of the operator basically.

Description

Multimode base station, radio frequency unit and implementation method thereof

The present invention relates to a multi-standard mobile communication technology, and in particular, to a multi-mode base station, a radio frequency unit and a method for implementing the same.

Background technique

Traditional mobile communication networks such as Global System for Mobile Communications (GSM), Code Division Multiple Access (CDMA) networks, Wideband Code Division Multiple Access (WCDMA) networks, and Time Division Synchronous Code Division Multiple Access (TD-SCDMA) networks are dedicated to each other. Single-mode base stations implement network operations, which inevitably leads to problems such as repeated construction of social network resources, high capital expenditures (CAPEX) and high operating costs (OPEX).

With the evolution of mobile communication technology to the fourth generation (4G) mobile communication technology Long Term Evolution (LTE) and the development of software radio technology, various operators are faced with network operation situations in which multiple network standards coexist. In this case, Multi-mode base stations supporting multiple network standards have emerged. Currently, various equipment vendors have given their own target plans for multi-mode base stations, but these multi-mode base stations can only use the full set of wireless devices of their respective companies, and cannot coexist with the existing equipment of the operators.

As shown in FIG. 1, the operator's existing wireless base station side device includes a baseband unit (BBU) 1, a radio frequency unit (RRU) 2, and an antenna 3. If the operator wants to upgrade the network to LTE, there are generally two options: one is to create a new network; the other is to upgrade on the original network equipment. Among them, the new network cost will be high, and the site resources and frequency resources are limited. Therefore, the operator generally chooses the second solution. However, since the interface of the wireless base station side device is not completely open, it is necessary to use the device of the original device vendor to upgrade the original network device. At this time, the operator does not choose to purchase only the device of the original device vendor. This makes the cost of procurement relatively high; more seriously, if the original equipment manufacturer does not intend to develop the next generation of communication equipment, the operator will face the situation of no new equipment purchase. In order to avoid future technical lags behind competitors, operators will eventually have to replace existing equipment such as base stations and base station controllers (BSC or RNC), causing great waste. Summary of the invention

In view of the above, the main object of the present invention is to provide a multi-mode base station, a radio frequency unit, and a method for realizing the same, which can realize integration with an existing device of an operator, and effectively reduce the cost of purchasing the operator.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

A radio frequency unit having at least two baseband-radio frequency interfaces connecting baseband units; the radio frequency unit for normalizing a baseband-radio frequency interface between the radio frequency unit and the baseband unit, and calling according to an operation control message sent by the baseband unit The radio frequency parameter pre-stored in the radio frequency unit adjusts the radio frequency parameter.

The radio frequency unit further includes:

Interface standardization module for standardizing baseband-RF interfaces;

a storage module, configured to store a radio frequency parameter configuration database corresponding to various network standards; and an intelligent management module, configured to adjust radio frequency parameters in the radio frequency parameter configuration database according to the operation control message.

The interface standardization module is specifically configured to unify the message of the operation and maintenance interface between the baseband unit and the radio unit by using the markup language.

The radio frequency parameter configuration database includes a carrier width, a transmit power, a peak clipping indicator, and a digital predistortion indicator.

The rule for adjusting the radio frequency parameter is configured by using a network standard priority system or a network standard ratio.

A method for implementing a radio frequency unit, comprising:

Locating at least two baseband-radio frequency interfaces of the baseband unit on the radio frequency unit;

Standardized baseband-radio frequency interface between the RF unit and the baseband unit;

The radio unit adjusts the radio frequency parameter by using the radio frequency parameter pre-stored in the radio unit according to the operation control message sent by the baseband unit.

The baseband-radio interface between the standardized radio frequency unit and the baseband unit is specifically: 釆 A message language is used to unify the operation and maintenance interface between the baseband unit and the radio unit.

Before the adjusting the radio frequency parameter, the method further includes: storing in the radio frequency unit Store the RF parameter configuration database corresponding to various network standards.

A multi-mode base station includes a baseband unit and a radio frequency unit; wherein the radio frequency unit has at least two baseband-radio frequency interfaces, and the baseband-radio frequency interface is used for connecting with the baseband unit;

a baseband unit, configured to process a maintenance message and send an operation control message to the radio frequency unit; a radio frequency unit, configured to standardize a baseband-radio frequency interface between the radio frequency unit and the baseband unit, and invoke pre-storage according to an operation control message sent by the baseband unit The RF parameters in the RF unit are adjusted for RF parameters.

It can be seen from the above technical solution that the present invention can make the RRU of the present invention integrate different devices by moving the main control function of the radio frequency part of the base station from the BBU to the RRU, and by standardizing the baseband-radio interface and improving the intelligent management degree of the RRU. The BBU of the Provider supports the interconnection between the BBUs of different equipment vendors and the RRUs of the present invention. When a multi-mode base station is introduced, it is only necessary to replace the original RRU of the carrier, and it is not necessary to replace the original BBU of the operator. Therefore, the present invention effectively reduces the operator's flaws on the basis of basically not modifying the existing network equipment of the operator. Purchase costs, and maintain the continuation of the business.

BRIEF abstract

1 is a schematic structural diagram of a radio base station side device in the prior art;

2 is a schematic structural view of an RRU of the present invention;

3 is a schematic structural diagram of a radio base station side device according to the present invention;

FIG. 4 is a schematic flowchart diagram of a method for implementing an RRU according to the present invention.

Preferred embodiment of the invention

The improvement made by the present invention will be clearly explained below by explaining the reasons why the existing multimode base stations are not compatible with each other. The BBU and RRU of the existing multimode base station are both designed and produced by the same equipment manufacturer. Although the standard public radio interface (CPRI) has been used between the BBU and the RRU, the CPRI only implements the baseband data frame format. Standardized, but the message of the upper layer operation and maintenance interface is not unified. Specifically, each device vendor defines a set of language for message exchange for its own BBU and RRU, and the message interaction language is not applicable to BBUs and RRUs of other equipment vendors.

In addition, due to the network level, the main control function of the base station is generally implemented by the BBU. However, if the multi-device vendor shares the radio resource, if each BBU controls the RRU, the resource conflict or even a serious fault may occur. Moreover, there is no standard interface between the BBUs of different equipment vendors to implement the negotiation mechanism, and the standard interface between the base stations is not defined.

In view of the above, the present invention provides an RRU having at least two baseband-radio frequency interfaces, and each baseband-radio interface can support various equipment vendors and various network standard BBUs according to the CPRI standard; and, the present invention will baseband - The RF interface is further standardized, and the message language is used to unify the message between the BBU and the RRU. Therefore, the RRU can not only connect with the BBUs of different equipment vendors, but also distinguish which network standards are supported by different BBUs.

In the present invention, the intelligent management of the RRU is also implemented. Specifically, the operation and maintenance messages are classified into two types: maintenance messages and operation control messages. For maintenance messages, maintenance messages of different network standards are transmitted through the respective BBUs.后台To the background of the network, because the maintenance message does not involve the adjustment of the radio frequency parameters, there is no conflict between them; for the operation control message, the BBU sends an operation control message to the RRU, and the RRU completes the radio frequency parameter according to the operation control message. Adjustment. In the prior art, all the operation and maintenance messages are processed by the BBU. In the present invention, the BBU sends the operation control message in the operation and maintenance message to the RRU, and the RRU obtains the adjustment of the radio frequency parameter from the main, so that Avoid resource conflicts or even serious failures.

Therefore, the core idea of the present invention is: by standardizing the baseband-radio interface, and moving the main control function of the radio part of the base station from the BBU to the RRU, and improving the intelligent management degree of the RRU, so that the RRU can integrate the BBUs of different equipment vendors. , thereby protecting the operator's investment.

Here, the standardized baseband-radio interface refers to a message that uses the markup language to unify the operation and maintenance interface between the BBU and the RRU; the moving the main control function from the BBU to the RRU, and improving the intelligent management degree of the RRU is The BBU sends the operation control message to the RRU. The operation control message carries the radio frequency parameter adjustment command. The RRU adjusts the radio frequency parameter according to the radio frequency parameter adjustment command. Adjustment.

The technical solutions of the present invention are further described in detail below. The present invention provides an RRU having at least two baseband-radio interfaces connected to a BBU. The RRU is used to standardize a baseband-radio interface between the RRU and the BBU, and is pre-stored in the RRU according to an operation control message sent by the BBU. The RF parameters in the RF parameters are adjusted.

The RRU can receive baseband data of at least two BBUs at the same time. The BBU can be a BBU of different equipment vendors and supporting different network technologies.

As shown in FIG. 2, the RRU 2' further includes: an interface normalization module 21 for standardizing the baseband-radio interface, specifically, a message for unifying the operation and maintenance interface between the BBU and the RRU by using a markup language.

Among them, the markup language can be Extensible Markup Language (XML).

In the Extensible Markup Language, hundreds of tags, ie parameter fields, such as carrier transmit band, carrier transmit frequency, carrier transmit start frequency, carrier transmit bandwidth, carrier transmit power, receive bandwidth, receive link signal strength, are predefined. The number of transmitting links, the number of receiving links, the temperature of the RF unit, the maximum temperature of the RF unit, the status of the external monitoring switch, etc. These marks are the same for some different systems and some are different. BBUs and RRUs can use a combination of multiple tags to interact with information. Some tags are common to various formats, and some tags are specific to certain or certain types of standards. Parameter fields such as carrier transmit power, number of transmit links, number of receive links, etc. are common to various standards, while carrier transmit bandwidth is different for various modes, carriers of CDMA, WCDMA, GSM, TD-SCDMA, etc. The width is fixed. This parameter field is not needed when sending control commands. In LTE and the Worldwide Interoperability for Wi-Fi (WiMax) system, the carrier width is variable and must have this parameter field. There are both general parameter fields and dedicated parameter fields in the content portion of the message. Unify the message into a common message by means of markup language.

The following is an example to illustrate how to use XML to unify the message between the BBU and the RRU.

The BBU of the CDMA system sends a two-carrier CDMA system configuration command to the RRU, one carrier CDMA IX, occupies 283 frequency points in the 800 MHz frequency band, one transmission and two reception, and the top transmission power is 20 W; The carrier CDMA EV-DO occupies 37 frequency points in the 800MHz frequency band, one transmission and two reception, and the top transmission power is 10W.

<?xml version:" 1.0"?>

<?xml-style type="text/css"?>

<cdma>

<carry>

</carry>

<carry>

</carry>

</cdma>

The band class field indicates the frequency band, the channel number field indicates the frequency point number, the tx link field indicates the number of transmitting links, the tx top power field indicates the top transmit power, and the rx link field indicates the number of received links.

The LTE standard BBU sends a carrier LTE standard configuration command to the RRU. One carrier LTE occupies 800MHz frequency band, 10M bandwidth, two transmissions and two receptions, and the top transmission power is 20W.

<?xml version:"1.0"?> <?xml-style type="text/css"?>

<lte>

<carry>

</carry>

</lte>

The band class field indicates the occupied frequency band, the band width field indicates the bandwidth, the tx link field indicates the number of transmitting links, the tx top power field indicates the top transmit power, and the rx link field indicates the number of received links.

It can be seen from the above example that the messages sent by the BBUs of various network standards to the RRU are described by XML, so that the RRU can recognize various network standard configuration commands, thereby implementing the RRU and various network standard BBUs. Fusion.

The RRU 2' further includes: a storage module 22, configured to store a radio frequency parameter configuration database corresponding to various network standards.

The radio frequency parameter configuration database includes radio frequency parameters such as a carrier width, a transmission power, a peak clipping indicator, and a digital predistortion indicator.

The RRU 2' further includes: an intelligent management module 23, configured to invoke the radio frequency parameter in the radio frequency parameter configuration database to adjust the radio frequency parameter according to the operation control message.

The rule for adjusting the radio frequency parameter is a network standard priority system or a network system proportional distribution system; and the rules for adjusting the radio frequency parameter may be changed in the background as needed. The background in this article refers to BSC or RNC.

The network system priority system is specifically as follows: When the radio frequency parameters are actually adjusted, if the radio frequency parameter configurations of the various network standards do not conflict, the radio frequency parameter adjustment command carried in the operation control message is used. To adjust the RF parameters; otherwise, adjust the RF parameters with a certain network priority.

There are many types of radio frequency parameter adjustment commands carried in the operation control message. For example, the adjustment command may be to adjust the carrier width to a certain range, or adjust the carrier transmission power to a certain value.

In addition, which network standard is preferred to adjust the RF parameters can be preset according to actual needs. The network system upper limit allocation system is specifically: when the radio frequency parameter is actually adjusted, if the radio frequency parameter configuration of the various network standards does not conflict, the radio frequency parameter is adjusted according to the radio frequency parameter adjustment command carried in the operation control message; otherwise, The network standard adjusts the radio frequency parameters according to their respective proportions.

Among them, the proportion of the various network standards to adjust the RF parameters can be preset according to actual needs.

In addition, the proportional allocation refers to the proportional allocation of radio frequency parameters of the same type in different network standards. For example, in a CDMA and LTE dual-mode base station, the allocation ratio of the carrier width of the CDMA system to the carrier width of the LTE system is set to 2:3.

The present invention is further illustrated by the specific embodiments of CDMA and LTE dual mode base stations.

The CDMA and LTE dual-mode base stations include one RRU and two BBUs, and the two BBUs support the CDMA system and the LTE system respectively; the RRU has two baseband-radio interfaces, which are respectively connected to the two BBUs.

The RRU includes an interface standardization module, a storage module, and an intelligent management module. The interface standardization module is used to standardize the baseband-radio interface, that is, to uniformly support the BBU of the CDMA system and the BBU and the RRU supporting the LTE standard by using the markup language. Inter-operational maintenance interface messages.

The storage module is configured to store a radio frequency parameter configuration database corresponding to the CDMA network standard and the LTE system respectively.

The intelligent management module is configured to adjust the radio frequency parameter according to the radio frequency parameter in the storage module according to the operation control message sent by the BBU, that is, different BBUs only need to control the radio frequency parameters of the respective network standards, and the RRU is mainly used to complete the radio frequency of various network standards. Adjustment of parameters. For example, if the BBU supporting the CDMA system wants to adjust the transmit power of a certain carrier, the BBU sends a carrier transmit power adjustment message to the RRU, and after receiving the carrier transmit power adjustment message, the RRU first calculates the adjusted total transmit power, and then It is judged whether the total transmit power after the adjustment exceeds the rated transmit power. If not, the RRU adjusts the transmit power of the carrier according to actual needs; otherwise, the transmit power is adjusted according to a predetermined adjustment rule.

The predetermined adjustment rules include: LTE standard or CDMA standard priority, or two network standards are allocated according to a fixed power upper limit. For example: Assume that the predetermined adjustment rule is prioritized by the CDMA system, the RRU's rated transmit power is 80W, the current transmit power for the CDMA system is 30W, and the transmit power for the LTE system is 50W; the transmit power of the CDMA system is adjusted. At 40 W, since the total transmit power after the adjustment exceeds the rated transmit power, the transmit power for the CDMA system is adjusted to 40 W and the transmit power for the LTE system is adjusted to 40 W according to the adjustment rule prioritized by the CDMA system.

Another example: Assume that the transmit power of the CDMA system and the LTE system are allocated according to 2:1, the RRU's rated transmit power is 60W, the current transmit power for the CDMA system is 20W, and the transmit power for the LTE system is 20W; The transmission power of the CDMA system is adjusted to 60 W. Since the total transmission power after the adjustment exceeds the rated transmission power, the transmission power for the CDMA system is adjusted to 40 W in accordance with the distribution ratio of 2:1. If the transmission power for the LTE system is only 10W; if the transmission power of the CDMA system is adjusted to 60W, since the total transmission power after the adjustment exceeds the rated transmission power, the ratio of 2:1 is considered, taking into account only It is possible to use the transmit power of the RRU to adjust the transmit power for the CDMA system to drive.

In addition, if you want to upgrade the carrier's existing network equipment, you can remove the original equipment supplier's RRU 2, then install the new equipment supplier's RRU 2' and BBU Γ, and the original equipment supplier and the new equipment supplier's BBU. 1 and the BBU 1' is connected to the RRU 2' through the optical fiber, and then download and install the software with the standardized baseband-radio interface function and the RRU intelligent management function to complete the upgrade of the dual-mode base station, as shown in FIG. The RRU 2' of the new equipment vendor is the RRU provided by the present invention.

To obtain the RRU described above, the present invention provides a method for implementing an RRU. As shown in FIG. 4, the method includes the following steps:

Step 401: Set at least two baseband-radio interfaces connected to the BBU on the RRU.

The BBU can be a BBU of different device vendors and supporting different network standards. Step 402: Standardize the baseband-radio interface between the RRU and the BBU.

Specifically, the message is used to unify the operation and maintenance interface between the BBU and the RRU, so that the RRU can not only connect with the BBUs of different equipment vendors but also distinguish which network standards are supported by different BBUs.

Step 403: The RRU adjusts the radio frequency parameter by using the radio frequency parameter pre-stored in the RRU according to the operation control message sent by the BBU.

Before adjusting the radio frequency parameters, the method further includes: storing, in the RRU, a radio frequency parameter configuration database corresponding to various network formats.

The RF parameter configuration database includes RF parameters such as carrier width, transmit power, peak clipping indicator, and digital pre-distortion indicator.

In addition, the rule for adjusting the radio frequency parameter is a network standard priority system or a network system proportional distribution system. The present invention also provides a multimode base station including a BBU and an RRU. The RRU has at least two baseband-radio interfaces, and the baseband-radio interface is used for connecting with the BBU;

a BBU, configured to process a maintenance message and send an operation control message to the RRU;

The RRU is used to standardize the baseband-radio interface between the RRU and the BBU, and adjusts the radio frequency parameter according to the radio frequency parameter pre-stored in the RRU according to the operation control message sent by the BBU.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Industrial applicability

The RRU of the present invention can be integrated with the BBU of different equipment vendors by moving the main control function of the radio frequency part of the base station from the baseband unit BBU to the radio frequency unit RRU, and by standardizing the baseband-radio interface and improving the intelligent management degree of the RRU. Supports interconnection between BBUs of different equipment vendors and RRUs of the present invention. When a multi-mode base station is introduced, it is only necessary to replace the original RRU of the carrier, and it is not necessary to replace the original BBU of the operator. Therefore, the present invention effectively reduces the operator's flaws on the basis of basically not modifying the operator's existing network equipment. Purchase costs, and maintain the continuation of the business.

Claims

Claim

A radio frequency unit comprising at least two baseband-radio frequency interfaces connected to a baseband unit; the radio frequency unit is configured to standardize the baseband-radio frequency interface, and is pre-stored according to an operation control message sent by the baseband unit The radio frequency parameter in the radio frequency unit adjusts radio frequency parameters of the radio frequency unit.

2. The radio frequency unit according to claim 1, further comprising:

An interface normalization module configured to standardize the baseband-radio frequency interface;

a storage module configured to store a radio frequency parameter configuration database corresponding to various network standards;

An intelligent management module is configured to adjust radio frequency parameters of the radio frequency unit according to the radio frequency parameter in the radio frequency parameter configuration database according to the operation control message.

3. The radio frequency unit according to claim 2, wherein the interface normalization module is further configured to unify the message of the operation and maintenance interface between the baseband unit and the radio frequency unit by using a markup language.

The radio frequency unit according to claim 2 or 3, wherein the radio frequency parameter configuration database includes a carrier width, a transmission power, a peak clipping indicator, and a digital predistortion indicator.

The radio frequency unit according to claim 2 or 3, wherein the intelligent management module further has parameters.

6. A method for implementing a radio frequency unit, comprising:

Normalizing the baseband-radio frequency interface between the radio frequency unit and the baseband unit; and the radio frequency unit calling a radio frequency parameter adjustment pre-stored in the radio frequency unit according to an operation control message sent by the baseband unit The radio frequency parameters of the radio unit.

7. The radio frequency unit implementation method according to claim 6, wherein the step of normalizing the baseband-radio frequency interface between the radio frequency unit and the baseband unit comprises: using a markup language And unifying the message of the operation and maintenance interface between the baseband unit and the radio frequency unit.

The method of implementing the radio frequency unit according to claim 6 or 7, wherein before the step of adjusting the radio frequency parameter of the radio frequency unit, the radio frequency unit implementation method further includes:

The radio frequency unit implementation method according to claim 8, wherein the radio frequency parameter configuration database includes a carrier width, a transmission power, a peak clipping indicator, and a digital predistortion indicator.

The radio frequency unit implementation method according to claim 6 or 7, wherein the radio frequency unit adjusts the adjustment in the step of radio frequency parameters of the radio frequency unit by network standard priority or network standard proportion distribution system.

11. A multimode base station, comprising a baseband unit and a radio frequency unit; wherein

The baseband unit is configured to process a maintenance message and send an operation control message to the radio frequency unit;

The radio frequency unit is configured to standardize a baseband-radio frequency interface between the radio frequency unit and the baseband unit, and invoke a radio frequency parameter adjustment pre-stored in the radio frequency unit according to an operation control message sent by the baseband unit. Describe the radio frequency parameters of the radio unit;

The baseband-radio frequency interface is at least two paths.