WO2012155612A1

WO2012155612A1 - Base band unit, bbu, rru and base station

Info

Publication number: WO2012155612A1
Application number: PCT/CN2012/072149
Authority: WO
Inventors: 许进; 吴明皓
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-09-06
Filing date: 2012-03-09
Publication date: 2012-11-22
Also published as: CN102316055A

Abstract

Disclosed are a base band unit, a building base band unit (BBU), a radio remote unit (RRU) and a base station. In the present invention, the functions of a base band unit are divided again in a BBU and an RRU. Before base band data enters a digital intermediate frequency, the functions of a base band unit are divided again in a BBU and an RRU, a part of functional modules in an existing BBU, such as a base band modulation module, a base band demodulation module, an encoding module, and a decoding module, are disposed in an RRU. Data of an interface bearer between the BBU and the RRU is not IQ data anymore, but is MAC data or soft bit information, so that data throughput of the interface between the BBU and the RRU can be reduced, thereby reducing base station cost and lowering the difficulty of technical implementation.

Description

Baseband unit, BBU, RRU and base station

The present invention relates to wireless communication technologies, and more particularly to a baseband unit, a BBU, an RRU, and a base station. Background technique

In an existing wireless communication system, a base station (NodeB) of an access network is usually composed of an indoor baseband processing unit (BBU) and a radio remote unit (RRU), BBU and RRU. Data interaction takes place through the interface, as shown in Figure 1. The existing BBU and RRU partitioning is based on the baseband data entering the digital intermediate frequency module, so that the I signal (Inphase Signal) and Q signal before the digital intermediate frequency module processing are transmitted on the interface between the BBU and the RRU. Quadrature Signal ).

Long Term Evolution (LTE) systems usually support 20MHz bandwidth. In order to increase processing performance, multiple antennas are usually configured. According to the interface between the existing BBU and the RRU (see Figure 1), the rate (or called data bandwidth) of the interface is very high. Taking the 8 antenna 20MHz bandwidth (sampling rate is about 30.72M/S) as an example, since the bit width of the I signal and the bit width of the Q signal are both set to 15bit based on the quantization accuracy, the required interface rate calculation formula is required. as follows:

Interface rate = (bit width of I signal + bit width of Q signal) X sampling rate X antenna number X

10/8 X 16/15

= 30bit 30.72M/S χ 8 χ 10/8 16/15

=9.8304Gbps

« lOGbps

In the formula, 10/8 is the optical port redundancy brought by the coding, and 16/15 is the redundancy brought by the control word. Above public The equation only considers the case of a single sector, and now the coverage of a typical base station is generally divided into three sectors, and there are three times the traffic. In the future, it is possible to face the network connection topology shown in Figure 2. In the network connection topology diagram shown in Figure 2, one RRU requires 10 Gbps of data bandwidth, and three RRU cascading requires 30 Gbps of data bandwidth. Such a large interface rate requires not only a large amount of optical fiber resources but also an increase in cost. At the same time, the implementation of the technology becomes very difficult, which brings great hidden dangers to the stability of the product. Similarly, if 100 RRUs are exchanged to the BBU through the switching network, the switching network needs to have a data exchange capacity of 1000 Gbps. This obviously puts huge demands on the exchange network. Therefore, how to reduce the data throughput on the interface has become a very important issue at this stage. Summary of the invention

In view of this, it is a primary object of the present invention to provide a baseband unit, a BBU, an RRU, and a base station to reduce data throughput on the interface between the BBU and the RRU.

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

The present invention discloses a baseband unit, including: a first baseband subunit and a second baseband subunit, wherein

The first baseband subunit is located in the indoor baseband processing unit BBU, and the second baseband subunit is located in the radio remote unit RRU, and the first baseband subunit and the second baseband subunit are connected by an interface between the BBU and the RRU, the interface Carry non-IQ data.

Further, the baseband unit includes: a baseband unit for a downlink direction,

The first baseband subunit includes: a Media Access Control (MAC) entity and an encoding module for the downlink direction, and the second baseband subunit includes: a baseband modulation module, and the BBU and the RRU are passed between the coding module and the baseband modulation module. Connected to the interface, where

a MAC entity, configured to perform MAC layer processing on the received data, and then send the processed data to the encoding module;

An encoding module, configured to perform channel coding on data from a MAC entity, and then encode the data The data is sent to the baseband modulation module through the interface;

a baseband modulation module, configured to perform baseband modulation on data received through the interface, and then send the modulated data to a digital intermediate frequency module in the RRU;

Or,

The first baseband subunit includes: a MAC entity for the downlink direction, the second baseband subunit includes: an encoding module and a baseband modulation module, wherein the MAC entity and the encoding module are connected by an interface between the BBU and the RRU, where

a MAC entity, configured to perform MAC layer processing on the received data, and then send the processed data to the encoding module through an interface;

An encoding module, configured to perform channel coding on the data received through the interface, and then send the encoded data to the baseband modulation module;

A baseband modulation module is configured to perform baseband modulation on the data from the encoding module, and then send the modulated data to the digital intermediate frequency module in the RRU.

Further, the baseband unit further includes: a baseband unit for an uplink direction,

The first baseband subunit further includes: a coding module and a MAC entity for an uplink direction, where the second baseband subunit further includes: a baseband demodulation module, and the baseband demodulation module and the decoding module pass between the RRU and the BBU Interfaces are connected, where

a baseband demodulation module, configured to perform channel estimation, equalization, and demodulation processing on the received data, and then send the processed data to the decoding module through an interface;

a decoding module, configured to perform channel decoding on the data received through the interface, and then send the decoded data to the MAC entity;

a MAC entity, configured to perform MAC layer processing on data from the decoding module, and then send the processed data;

Or,

The first baseband subunit further includes: a MAC entity for the uplink direction, and a second baseband subunit The method further includes: a baseband demodulation module and a decoding module, wherein the decoding module and the MAC entity are connected by an interface between the RRU and the BBU, where

a baseband demodulation module, configured to perform channel estimation, equalization, and demodulation processing on the received data, and then send the processed data to the decoding module;

a decoding module, configured to perform channel decoding on the data from the baseband demodulation module, and then send the decoded data to the MAC entity through the interface;

The MAC entity is configured to perform MAC layer processing on the data received through the interface, and then send the processed data.

Further, the baseband unit includes: a baseband unit for an uplink direction,

The first baseband subunit includes: a decoding module and a MAC entity for an uplink direction, where the second baseband subunit includes: a baseband demodulation module, and the baseband demodulation module and the decoding module are connected through an interface between the RRU and the BBU , among them,

Or,

The first baseband subunit includes: a MAC entity for the uplink direction, and the second baseband subunit includes: a baseband demodulation module and a decoding module, where the decoding module and the MAC entity are connected by an interface between the RRU and the BBU, where ,

a decoding module, configured to perform channel decoding on data from a baseband demodulation module, and then translate The data after the code is sent to the MAC entity through the interface;

The present invention also discloses a BBU, including a protocol frame processing module, a control and clock module, and a global positioning system, and further includes: a baseband subunit in the baseband unit, connected to the RRU through an interface between the BBU and the RRU, the interface Carry non-IQ data.

Further, the baseband subunit includes: a baseband subunit for a downlink direction, the baseband subunit includes: a MAC entity and an encoding module, where the coding module and the RRU are connected by an interface between the BBU and the RRU, where

a MAC entity, configured to perform MAC layer processing on data from the control and clock module, and then send the processed data to the encoding module;

An encoding module, configured to perform channel coding on the data from the MAC entity, and then send the encoded data to the RRU through the interface;

Or,

The baseband subunit includes: a MAC entity, and the MAC entity and the RRU are connected by an interface between the BBU and the RRU, where

The MAC entity is configured to perform MAC layer processing on data from the control and clock modules, and then send the processed data to the RRU through the interface.

Further, the baseband sub-unit further includes: a baseband sub-unit for an uplink direction, where the baseband sub-unit includes: a decoding module and a MAC entity, where the decoding module and the RRU are connected by an interface between the BBU and the RRU, among them,

a decoding module, configured to receive data from the RRU through the interface, perform channel decoding on the received data, and then send the decoded data to the MAC entity;

a MAC entity, configured to perform MAC layer processing on data from the decoding module, and then send the processed data to a control and clock module; or,

The MAC entity is configured to receive data from the RRU through the interface, perform MAC layer processing on the received data, and then send the processed data to the control and clock module.

Further, the baseband subunit includes: a baseband subunit for an uplink direction, where the baseband subunit includes: a decoding module and a MAC entity, where the decoding module and the RRU are connected by an interface between the BBU and the RRU, where ,

a MAC entity, configured to perform MAC layer processing on data from the decoding module, and then send the processed data to the control and clock module;

Or,

The invention also discloses an RRU, comprising a digital intermediate frequency unit, a transceiver, a power amplification and a low noise amplifier and an antenna, and a baseband subunit in the baseband unit, connected to the BBU through an interface between the RRU and the BBU, The interface carries non-IQ data.

Further, the baseband subunit includes: a baseband subunit for a downlink direction, the baseband subunit includes: a baseband modulation module, wherein the baseband modulation module and the BBU are connected by an interface between the RRU and the BBU, where

a baseband modulation module, configured to receive data from the BBU through the interface, perform baseband modulation on the received data, and then send the modulated data to the digital intermediate frequency module; or,

The baseband subunit includes: an encoding module and a baseband modulation module, wherein the coding module and the BBU are connected through an interface between the RRU and the BBU, where

An encoding module, configured to receive data from the BBU through the interface, perform channel coding on the received data, and then send the encoded data to the baseband modulation module;

A baseband modulation module is configured to perform baseband modulation on data from the encoding module, and then transmit the modulated data to the digital intermediate frequency module.

Further, the baseband sub-unit further includes: a baseband sub-unit for an uplink direction, where the baseband sub-unit includes: a baseband demodulation module, and the baseband demodulation module and the BBU are connected by an interface between the RRU and the BBU, where ,

a baseband demodulation module, configured to perform channel estimation, equalization, and demodulation processing on data from the digital intermediate frequency module, and then send the processed data to the BBU through the interface; or

The baseband subunit includes: a baseband demodulation module and a decoding module, wherein the decoding module is connected to the BBU through an interface between the RRU and the BBU, where

a baseband demodulation module, configured to perform channel estimation, equalization, and demodulation processing on data from the digital intermediate frequency module, and then send the processed data to the decoding module;

The decoding module is configured to perform channel decoding on the data from the baseband demodulation module, and then send the decoded data to the BBU through the interface.

Further, the baseband subunit includes: a baseband subunit for an uplink direction, where the baseband subunit includes: a baseband demodulation module, and the baseband demodulation module is connected to the BBU through an interface between the RRU and the BBU, where

The baseband subunit includes: a baseband demodulation module and a decoding module, wherein the decoding module is connected to the BBU through an interface between the RRU and the BBU, where a baseband demodulation module, configured to perform channel estimation, equalization, and demodulation processing on data from the digital intermediate frequency module, and then send the processed data to the decoding module;

The invention also discloses a base station, comprising: a BBU including a protocol frame processing module, a control and clock module and a global positioning system, and an RRU including a digital intermediate frequency unit, a transceiver, a power amplification and a low noise amplifier and an antenna, wherein

The BBU further includes: a first baseband subunit in the baseband unit,

The RRU further includes: a second baseband subunit in the baseband unit,

The first baseband subunit and the second baseband subunit are connected by an interface between the BBU and the RRU, and the interface carries non- IQ data.

Further, the baseband unit includes: a baseband unit for a downlink direction,

The first baseband subunit includes: a medium access control MAC entity and an encoding module for the downlink direction, and the second baseband subunit includes: a baseband modulation module, where the coding module and the baseband modulation module are connected by an interface between the BBU and the RRU, among them,

An encoding module, configured to perform channel coding on the data from the MAC entity, and then send the encoded data to the baseband modulation module through the interface;

Or,

The first baseband subunit includes: a MAC entity for the downlink direction, the second baseband subunit includes: an encoding module and a baseband modulation module, wherein the MAC entity and the encoding module are connected by an interface between the BBU and the RRU, where a MAC entity, configured to perform MAC layer processing on the received data, and then send the processed data to the encoding module through an interface;

Or,

The first baseband sub-unit further includes: a MAC entity for the uplink direction, where the second baseband sub-unit further includes: a baseband demodulation module and a decoding module, where the decoding module and the MAC entity are connected through an interface between the RRU and the BBU , among them,

a MAC entity, configured to perform MAC layer processing on data received through the interface, and then The processed data is sent.

Further, the baseband unit includes: a baseband unit for an uplink direction,

Or,

In summary, the proposed scheme re-divides the functions of the baseband unit in the BBU and the RRU, that is, the function of the baseband unit is re-divided in the BBU and the RRU before the baseband data enters the digital intermediate frequency module, so that the existing BBU is Some of the functional modules (such as baseband modulation module, baseband demodulation module, and further such as coding module and decoding module) will be set to the RRU. At this time, the data carried by the interface between the BBU and the RRU will no longer be IQ data, but MAC data or soft bit information, thereby reducing the data throughput of the interface between the BBU and the RRU, thereby reducing the cost of the base station. Reduce the difficulty of technical implementation.

In addition, since the user does not occupy all the air interface bandwidth resources at all times, the total amount of the bandwidth is not linearly increased, but less, thereby reducing the exchange between the BBU and the RRU. The pressure of the network to achieve more dynamic resource sharing, energy saving and emission reduction, greatly reducing the maintenance cost of equipment. DRAWINGS

1 is a schematic diagram of a division manner of a BBU and an RRU in a base station in the prior art;

Figure 2 is a topology diagram of the network connection that may be faced in the future;

3 is a schematic structural diagram of a data transmission device 1 of the present invention;

4 is a schematic structural diagram of a data transmission device 2 of the present invention;

FIG. 5 is a schematic structural diagram of a data transmission device 3 according to the present invention;

6 is a schematic structural diagram of a data transmission device 4 of the present invention;

Figure 7 is a schematic view of a first embodiment of the present invention;

Figure 8 is a schematic view of a second embodiment of the present invention;

Figure 9 is a schematic view of a third embodiment of the present invention;

FIG. 10 is a schematic diagram of a fourth embodiment of the present invention. detailed description

The baseband unit in the existing BBU shown in FIG. 1 includes, in the downlink direction (ie, from the BBU to the RRU), a Media Access Control (MAC) entity, an encoding module, and a baseband modulation module, where The entity is configured to perform MAC layer processing on the data from the control and clock module in the BBU, and then send the data to the encoding module; the encoding module is configured to perform channel coding on the data from the MAC entity, and then send the data to the baseband modulation module; the baseband modulation module It is used for baseband modulation of data from the coding module, and then sent to the digital intermediate frequency module in the RRU for processing through the interface between the BBU and the RRU. According to the processing and mutual interaction of the modules of the baseband unit in the BBU in the downlink direction described above, since the I signal and the Q signal, that is, the IQ data, are obtained after the baseband modulation, the interface between the BBU and the RRU is The bearer is the IQ data, which directly leads to the very high rate requirement of the interface.

The baseband unit in the existing BBU shown in FIG. 1 includes, in an uplink direction (ie, a direction from the RRU to the BBU): a baseband demodulation module, a decoding module, and a MAC entity, where the baseband demodulation module is used to pass the BBU The interface with the RRU receives data from the digital intermediate frequency module in the RRU, performs channel estimation, equalization, and demodulation processing on the data, and then transmits the processed data to the decoding module; the decoding module is used to base the baseband The data of the demodulation module is channel-decoded, and then the decoded data is sent to the MAC entity; the MAC entity is configured to perform MAC layer processing on the data from the decoding module, and then send the processed data to the control in the BBU. With the clock module. According to the processing and mutual interaction of the modules of the baseband unit in the BBU in the uplink direction described above, since the objects processed before the modulation are all I signals and Q signals, that is, IQ data, the BBU and the RRU are The interface between the interfaces carries IQ data, which directly leads to a very high rate requirement for the interface.

It can be seen from the above description that if the data carried on the interface between the BBU and the RRU is no longer IQ data, the rate requirement of the interface can be greatly reduced. Therefore, whether part of the baseband unit in the BBU is placed on the other side of the original interface, that is, the RRU-side, in the downstream direction or the upstream direction, it will become a key point for reducing the interface rate requirement.

The basic idea of the present invention is: The baseband unit includes a first baseband subunit and a second baseband subunit, wherein the first baseband subunit is located at the BBU, and the second baseband subunit is located at the RRU, the first baseband subunit and the second baseband The units are connected by an interface between the BBU and the RRU, and the interface carries non-IQ data, that is, data before the IQ data is processed.

Specifically, in the downstream direction (ie, from the BBU to the RRU): In the baseband unit for the downlink direction, the first baseband subunit located in the BBU includes a MAC entity and an encoding module for the downlink direction, and the second baseband subunit located in the RRU is a baseband modulation module, that is, a MAC entity in the baseband unit. And the coding module is still located in the BBU, the baseband modulation module in the baseband unit is located in the RRU, and the coding module and the baseband modulation module are connected through an interface between the BBU and the RRU; the coding module performs channel coding on the data from the MAC entity, and then encodes The latter data is sent to the baseband modulation module through the interface, and the baseband modulation module performs baseband modulation on the data received through the interface, and then sends the modulated data to the digital intermediate frequency module in the RRU; or

In the baseband unit for the downlink direction, the first baseband subunit located in the BBU is a MAC entity for the downlink direction, and the second baseband subunit located in the RRU includes an encoding module and a baseband modulation module, that is, a MAC entity in the baseband unit. Still located in the BBU, the coding module and the baseband modulation module in the baseband unit are located in the RRU, and the MAC entity and the coding module are connected through an interface between the BBU and the RRU; the coding module receives data from the MAC entity through the interface, and receives the data. The channel coding is performed, and then the encoded data is sent to the baseband modulation module. The baseband modulation module performs baseband modulation on the data from the coding module, and then transmits the modulated data to the digital intermediate frequency module in the RRU.

Specifically, in the upstream direction (ie, from the RRU to the BBU):

In the baseband unit for the uplink direction, the first baseband subunit located in the BBU includes a decoding module and a MAC entity for the uplink direction, and the second baseband subunit located in the RRU is a baseband demodulation module, that is, in the baseband unit. The baseband demodulation module is located in the RRU, and the decoding module and the MAC entity in the baseband unit are still located in the BBU, and the baseband demodulation module and the decoding module are connected through an interface between the RRU and the BBU; the baseband demodulation module is from the RRU. The data of the digital intermediate frequency module performs channel estimation, equalization and demodulation processing, and then the processed data is sent to the decoding module through the interface, and the decoding module performs channel decoding on the data received through the interface, and then decodes the decoded data. Data is sent to the MAC entity; or, In the baseband unit for the uplink direction, the first baseband subunit located in the BBU is a MAC entity for the uplink direction, and the second baseband subunit located in the RRU includes a baseband demodulation module and a decoding module, that is, in the baseband unit. The baseband demodulation module and the decoding module are located in the RRU, and the MAC entity in the baseband unit is still located in the BBU, and the decoding module and the MAC entity are connected through the interface between the RRU and the BBU; the baseband demodulation module pairs the digital intermediate frequency from the RRU The module data is subjected to channel estimation, equalization and demodulation processing, and then the processed data is sent to the decoding module, and the decoding module performs channel decoding on the data from the baseband demodulation module, and then passes the decoded data through the interface. Send to the MAC entity.

The present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be combined with each other.

To implement the solution of the present invention, the present invention proposes a baseband unit for the downlink direction. As shown in FIG. 3, the baseband unit includes: a MAC entity and an encoding module located in the BBU, and a baseband modulation module located in the RRU. The coding module and the baseband modulation module are connected through an interface between the BBU and the RRU. among them,

a MAC entity, configured to perform MAC layer processing on data from a control and clock module in the BBU, and then send the processed data to the encoding module;

The baseband modulation module is configured to perform baseband modulation on the data received through the interface, and then send the modulated data to the digital intermediate frequency module in the RRU.

Based on the above baseband unit, the present invention also proposes a BBU. As shown in FIG. 3, in addition to the existing protocol frame processing module, the control and clock module, and the global positioning system, the baseband subunit in the baseband unit is also included. MAC entity and encoding module. The coding module and the RRU are connected through an interface between the BBU and the RRU. among them, a MAC entity, configured to perform MAC layer processing on data from the control and clock module, and then send the processed data to the encoding module;

And an encoding module, configured to perform channel coding on the data from the MAC entity, and then send the encoded data to the RRU through the interface.

Based on the above baseband unit, the present invention also proposes an RRU, as shown in FIG. 3, in addition to the existing digital intermediate frequency unit, the transceiver, the power amplification and low noise amplifier and the antenna, and the baseband in the baseband unit. Unit, ie baseband modulation module. The baseband modulation module is connected to the BBU through an interface between the RRU and the BBU. among them ,

The baseband modulation module is configured to receive data from the BBU through the interface, perform baseband modulation on the received data, and then send the modulated data to the digital intermediate frequency module.

To implement the solution of the present invention, the present invention further provides a baseband unit for the downlink direction. As shown in FIG. 4, the baseband unit includes: a MAC entity located in the BBU, and an encoding module and a baseband modulation module located in the RRU. The MAC entity and the encoding module are connected through an interface between the BBU and the RRU. among them,

a MAC entity, configured to perform MAC layer processing on data from a control and clock module in the BBU, and then send the processed data to the encoding module through an interface;

Based on the above baseband unit, the present invention also proposes a BBU. As shown in FIG. 4, in addition to the existing protocol frame processing module, the control and clock module, and the global positioning system, the baseband subunit in the baseband unit is also included. The MAC entity is connected to the RRU through an interface between the BBU and the RRU. among them,

MAC entity for performing MAC layer processing on data from the control and clock modules, The processed data is then sent to the RRU through the interface.

Based on the above baseband unit, the present invention also proposes an RRU, as shown in FIG. 4, in addition to the existing digital intermediate frequency unit, the transceiver, the power amplification and low noise amplifier and the antenna, and the baseband in the baseband unit. The unit, ie the coding module and the baseband modulation module. The coding module is connected to the BBU through an interface between the RRU and the BBU. among them ,

In order to implement the solution of the present invention, the present invention also provides a baseband unit for the uplink direction. As shown in FIG. 5, the baseband unit includes: a baseband demodulation module located in the RRU, and a decoding module and a MAC located in the BBU. entity. The baseband demodulation module and the decoding module are connected through an interface between the RRU and the BBU. among them,

a baseband demodulation module, configured to perform channel estimation, equalization, and demodulation processing on data from the digital intermediate frequency module in the RRU, and then send the processed data to the decoding module through the interface; the decoding module is configured to pass the interface Receiving data for channel decoding, and then transmitting the decoded data to the MAC entity;

The MAC entity is configured to perform MAC layer processing on the data from the decoding module, and then send the processed data to the control and clock module in the BBU.

Based on the above baseband unit, the present invention also proposes a BBU. As shown in FIG. 5, in addition to the existing protocol frame processing module, the control and clock module, and the global positioning system, the baseband subunit in the baseband unit is also included. Decoding module and MAC entity. The decoding module is connected to the RRU through an interface between the BBU and the RRU. among them,

a decoding module, configured to receive data from the RRU through the interface, perform channel decoding on the received data, and then send the decoded data to the MAC entity; The MAC entity is configured to perform MAC layer processing on the data from the decoding module, and then send the processed data to the control and clock module.

Based on the above baseband unit, the present invention also proposes an RRU. As shown in FIG. 5, in addition to the existing digital intermediate frequency unit, the transceiver, the power amplification and low noise amplifier and the antenna, the method further includes: a baseband in the baseband unit Unit, ie baseband demodulation module. The baseband demodulation module is connected to the BBU through an interface between the RRU and the BBU. among them ,

The baseband demodulation module is configured to perform channel estimation, equalization, and demodulation processing on the data from the digital intermediate frequency module, and then send the processed data to the BBU through the interface.

In order to implement the solution of the present invention, the present invention further provides a baseband unit for the uplink direction. As shown in FIG. 6, the baseband unit includes: a baseband demodulation module and a decoding module located in the RRU, and a MAC located in the BBU. entity. The decoding module and the MAC entity are connected through an interface between the RRU and the BBU. among them,

a baseband demodulation module, configured to perform channel estimation, equalization, and demodulation processing on data from the digital intermediate frequency module in the RRU, and then send the processed data to the decoding module;

The MAC entity is configured to perform MAC layer processing on the data received through the interface, and then send the processed data to the control and clock module in the BBU.

Based on the above baseband unit, the present invention also proposes a BBU, as shown in FIG. 6, in addition to the existing protocol frame processing module, the control and clock module, and the global positioning system, and the baseband subunit in the baseband unit, that is, MAC entity. The MAC entity is connected to the RRU through an interface between the BBU and the RRU. among them,

Based on the above baseband unit, the present invention also proposes an RRU, as shown in FIG. 6, except for the package. The invention includes an existing digital intermediate frequency unit, a transceiver, a power amplification and a low noise amplifier and an antenna, and further includes: a baseband subunit in the baseband unit, that is, a baseband demodulation module and a decoding module. Decoding module and

The BBUs are connected to each other through the interface between the RRU and the BBU. among them ,

Specific embodiment 1

As shown in FIG. 7 , taking the 3GPP LTE system as an example, in the uplink direction from the RRU to the BBU, all processing resources before channel decoding are placed in the RRU, and processing resources after channel decoding (including channel decoding) are performed. All are placed in the BBU, that is: the baseband demodulation module in the baseband unit for the uplink direction is located in the RRU, and the decoding module is located in the BBU. The soft bit information after demodulation and before decoding is transmitted on the interface between the BBU and the RRU.

Specifically, in the uplink direction from the RRU to the BBU, the antenna in the RRU receives the uplink data, and after being processed by the power amplification, the digital intermediate frequency, and the like in the RRU, the module is processed by the channel estimation, equalization, and demodulation to generate each user. Soft bit information, and the generated soft bit information is transmitted to the BBU through the interface between the RRU and the BBU;

After receiving the soft bit information transmitted by the RRU through the interface, the BBU performs channel decoding and MAC layer processing on the soft bit information.

The power amplification, digital intermediate frequency and other modules are functional modules in the existing RRU; the baseband demodulation module for performing channel estimation, equalization, demodulation, etc. is a functional module in the existing BBU, and is set in the RRU in this embodiment. in.

In the downlink direction from the BBU to the RRU, the processing resources after the channel coding and before the baseband modulation are all placed in the BBU, and the processing resources after the baseband modulation (including the baseband modulation) are all placed in the RRU, that is, used for the downlink direction. The coding module in the baseband unit is located in the BBU, base The band modulation module is located in the RRU. Transmitted on the interface between the BBU and the RRU is data after channel coding and before baseband modulation.

Specifically, in the downlink direction from the BBU to the RRU, the data processed by the MAC layer is channel-coded in the BBU, and then sent to the RRU through the interface between the BBU and the RRU;

After receiving the encoded data sent by the BBU through the interface, the RRU is first processed by the baseband modulation module, processed by a digital intermediate frequency, power amplification module, and finally sent to the user terminal through the antenna.

The baseband modulation module is a functional module in the existing BBU, and is disposed in the RRU in this embodiment; the digital intermediate frequency, power amplification, and the like are functional modules in the existing RRU.

Through this division, a 20 MHz bandwidth and 8 antenna cell data is transmitted on the interface between the BBU and the RRU. The peak rate of the LTE is 100 Mbps. The maximum data bandwidth required for the interface between the BBU and the RRU can be calculated as follows:

Peak rate of interface rate = 1^3⁄4 X soft bit quantization accuracy

= 100Mbps X 15

=1.5Gbps

Specific embodiment 2

As shown in FIG. 8 , taking the 3GPP LTE system as an example, in the uplink direction from the RRU to the BBU, all processing resources before channel decoding are placed in the RRU, and processing resources after channel decoding (including channel decoding) are performed. All are placed in the BBU, that is: the baseband demodulation module in the baseband unit for the uplink direction is located in the RRU, and the decoding module is located in the BBU. The soft bit information after demodulation and before decoding is transmitted on the interface between the BBU and the RRU.

Specifically, in the uplink direction from the RRU to the BBU, after receiving the uplink data, the antenna in the RRU is processed by a module such as power estimation and digital intermediate frequency in the RRU, and then processed by a module such as channel estimation, equalization, and demodulation. The soft bit information of each user, and the generated soft bit information is transmitted to the BBU through the interface between the RRU and the BBU;

After receiving the soft bit information transmitted by the RRU through the interface, the BBU performs the soft bit information. Channel decoding and MAC layer processing.

In the downlink direction from the BBU to the RRU, all the resources before the MAC layer processing (including the MAC layer processing) are placed in the BBU, and all the resources processed by the MAC layer are placed in the RRU, that is, the baseband unit for the downlink direction. The encoding module and the baseband modulation module are both located in the BBU. The data transmitted between the BBU and the RRU is transmitted after the MAC layer processing and before the physical layer processing.

Specifically, in the downlink direction from the BBU to the RRU, the data processed by the MAC layer in the BBU is sent to the RRU through the interface between the BBU and the RRU;

After receiving the data processed by the BBU through the interface, the RRU is processed by the module such as channel coding and baseband modulation, and then processed by the digital intermediate frequency and power amplification modules, and finally sent to the user terminal through the antenna.

The modules such as channel coding and baseband modulation are functional modules in the existing BBU, and are set in the RRU in this embodiment; the digital intermediate frequency, power amplification and other modules are functional modules in the existing RRU.

Interface rate =!^3⁄4 peak rate X soft bit quantization accuracy

= 100Mbps X 15

=1.5Gbps

Concrete embodiment 3

As shown in FIG. 9 , taking the 3GPP LTE system as an example, in the uplink direction from the RRU to the BBU, all the processing resources before the MAC layer processing are placed in the RRU, and after the MAC layer is processed (package The processing resources including the MAC layer processing are all placed in the BBU, that is: the baseband demodulation module and the decoding module in the baseband unit for the uplink direction are located in the RRU. The MAC layer processes the data before the physical layer processing is transmitted on the interface between the BBU and the RRU.

Specifically, in the uplink direction from the RRU to the BBU, after receiving the uplink data, the antenna in the RRU is subjected to power amplification, digital intermediate frequency, and the like processing in the RRU, and then subjected to channel estimation, equalization, demodulation, channel decoding, and the like. After the processing, the data processed by the physical layer is obtained, and the data is transmitted to the BBU through the interface between the RRU and the BBU;

After receiving the data processed by the physical layer of the RRU through the interface, the BBU directly performs MAC layer processing on the data.

Among them, the power amplification, digital intermediate frequency and other modules are functional modules in the existing RRU; the baseband demodulation module and the decoding module for performing channel estimation, equalization, demodulation, channel decoding, etc. are functional modules in the existing BBU, It is set in the RRU in this embodiment.

In the downlink direction from the BBU to the RRU, the processing resources after the channel coding and before the baseband modulation are all placed in the BBU, and the processing resources after the baseband modulation (including the baseband modulation) are all placed in the RRU, that is, used for the downlink direction. The coding module in the baseband unit is located in the BBU, and the baseband modulation module is located in the RRU. The data transmitted after the channel coding and before the baseband modulation are transmitted on the interface between the BBU and the RRU.

Through this division, a 20MHz bandwidth is transmitted on the interface between the BBU and the RRU, 8 Antenna cell data, where the peak rate of LTE is 100 Mbps, and the maximum data bandwidth required for the interface between the BBU and the RRU can be calculated as follows:

Peak rate of interface rate = 1^3⁄4 X soft bit quantization accuracy

= 100Mbps X 15

=1.5Gbps

Concrete embodiment 4

As shown in FIG. 10, taking the 3GPP LTE system as an example, in the uplink direction from the RRU to the BBU, all processing resources before the MAC layer processing are placed in the RRU, and the processing resources after the MAC layer processing (including the MAC layer processing) are processed. All are placed in the BBU, that is: the baseband demodulation module and the decoding module in the baseband unit for the uplink direction are located in the RRU. The data before the physical layer processing and after the MAC layer processing is transmitted on the interface between the BBU and the RRU.

Specifically, in the uplink direction from the RRU to the BBU, after receiving the uplink data, the antenna in the RRU is first processed by the power amplification, digital intermediate frequency, and the like in the RRU, and then subjected to channel estimation, equalization, demodulation, channel decoding, and the like. After processing, the data processed by the physical layer is obtained, and the data is transmitted to the BBU through the interface between the RRU and the BBU;

Among them, the power amplification, digital intermediate frequency and other modules are functional modules in the existing RRU; the baseband demodulation module and the decoding module for performing channel estimation, equalization, demodulation, channel decoding, etc. are functional modules in the existing BBU. It is set in the RRU in this embodiment.

In the downlink direction from the BBU to the RRU, the resources before the MAC layer processing (including the MAC layer processing) are all placed in the BBU, and all the resources processed by the MAC layer are placed in the RRU, that is, the baseband unit for the downlink direction. The encoding module and the baseband modulation module are both located in the BBU. The data transmitted between the BBU and the RRU is transmitted after the MAC layer processing and before the physical layer processing.

Specifically, after the MAC layer is processed in the BBU in the downlink direction from the BBU to the RRU The data is sent to the RRU through the interface between the BBU and the RRU;

After receiving the data processed by the MAC layer sent by the BBU through the interface, the RRU is processed by a module such as channel coding and baseband modulation, and then processed by a module such as digital intermediate frequency and power amplification, and finally sent to the user terminal through the antenna.

Through this division, a 20 MHz bandwidth and 8 antenna cell data is transmitted on the interface between the BBU and the RRU. The peak rate of the LTE is 100 Mbps. The maximum required data bandwidth required for the interface between the BBU and the RRU is only:

Interface rate = peak rate of LTE

= 100Mbps

It can be seen that the solution proposed by the present invention can significantly reduce the data throughput on the interface between the BBU and the RRU, thereby reducing the cost of the base station and reducing the difficulty of technical implementation. In addition, since the user does not occupy all the air interface bandwidth resources at all times, the total amount of the bandwidth is not linearly increased, but less, thereby reducing the exchange between the BBU and the RRU. Network pressure.

It should be noted that although the LTE system is used as an embodiment, the present invention is also applicable to the Global System for Mobile communication (GSM), Wideband Code Division Multiple Access (WCDMA), and code. Other wireless communication systems such as Code Division Multiple Access (CDMA) 2000, Worldwide Interoperability for Microwave Access (WiMAX).

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and equivalent structural changes made by the above features and the contents of the specification and drawings of the present invention are equally included in the present invention. Within the scope of the invention.

Claims

Claim

A baseband unit, comprising: a first baseband subunit and a second baseband subunit, wherein

The first baseband subunit is located in the indoor baseband processing unit BBU, and the second baseband subunit is located in the radio frequency remote unit RRU;

The baseband unit according to claim 1, wherein the baseband unit comprises: a baseband unit for a downlink direction;

The first baseband subunit includes: a medium access control MAC entity and an encoding module for the downlink direction, and the second baseband subunit includes: a baseband modulation module, where the coding module and the baseband modulation module are connected by an interface between the BBU and the RRU; among them,

Or,

An encoding module, configured to perform channel coding on data received through the interface, and then encode the data The subsequent data is sent to the baseband modulation module;

The baseband unit according to claim 2, wherein the baseband unit further comprises: a baseband unit for an uplink direction;

Or,

The baseband unit according to claim 1, wherein the baseband unit comprises: Baseband unit for the upstream direction;

Or,

A BBU, comprising a protocol frame processing module, a control and clock module, and a global positioning system, wherein the BBU further comprises: a baseband subunit in the baseband unit, connected to the RRU through an interface between the BBU and the RRU, The interface carries non-IQ data.

The BBU according to claim 5, wherein the baseband subunit comprises: a baseband subunit for a downlink direction; The baseband subunit includes: a MAC entity and an encoding module, where the coding module and the RRU are connected by an interface between the BBU and the RRU, where

Or,

The BBU according to claim 6, wherein the baseband subunit further comprises: a baseband subunit for an uplink direction;

The baseband subunit includes: a decoding module and a MAC entity, where the decoding module and the RRU are connected by an interface between the BBU and the RRU, where

Or,

The BBU according to claim 5, wherein the baseband subunit comprises: Baseband subunit for the upstream direction;

Or,

An RRU, comprising a digital intermediate frequency unit, a transceiver, a power amplification and a low noise amplifier and an antenna, wherein the RRU further comprises: a baseband subunit in the baseband unit, and an interface between the RRU and the BBU and the BBU Connected, the interface carries non-IQ data.

The RRU according to claim 9, wherein the baseband subunit comprises: a baseband subunit for a downlink direction;

The baseband subunit includes: a baseband modulation module, and the baseband modulation module is connected to the BBU through an interface between the RRU and the BBU, where

a baseband modulation module, configured to receive data from the BBU through the interface, perform baseband modulation on the received data, and then send the modulated data to the digital intermediate frequency module;

Or,

An encoding module, configured to receive data from the BBU through the interface, and perform the received data Channel coding, and then transmitting the encoded data to the baseband modulation module;

The RRU according to claim 10, wherein the baseband subunit further comprises: a baseband subunit for an uplink direction;

The baseband subunit includes: a baseband demodulation module, and the baseband demodulation module and the BBU are connected through an interface between the RRU and the BBU, where

The decoding module is configured to perform channel decoding on the data from the baseband demodulation module, and then send the modulated data to the BBU through the interface.

The RRU according to claim 9, wherein the baseband subunit comprises: a baseband subunit for an uplink direction;

a baseband demodulation module, configured to perform channel estimation, equalization, and demodulation processing on data from the digital intermediate frequency module, and then send the processed data to the decoding module; The decoding module is configured to perform channel decoding on the data from the baseband demodulation module, and then send the decoded data to the BBU through the interface.

13. A base station, comprising: a BBU including a protocol frame processing module, a control and clock module, and a global positioning system, and an RRU including a digital intermediate frequency unit, a transceiver, a power amplification and a low noise amplifier, and an antenna, wherein

The BBU further includes: a first baseband subunit in the baseband unit,

The RRU further includes: a second baseband subunit in the baseband unit,

The base station according to claim 13, wherein the baseband unit comprises: a baseband unit for a downlink direction;

Or,

a MAC entity for performing MAC layer processing on the received data, and then processing the processed Data is sent to the encoding module through the interface;

The base station according to claim 14, wherein the baseband unit further comprises: a baseband unit for an uplink direction;

Or,

The base station according to claim 13, wherein the baseband unit comprises: a baseband unit for an uplink direction;

Or,