WO2017193313A1

WO2017193313A1 - Digital unit, radio unit, base station and data transmission method

Info

Publication number: WO2017193313A1
Application number: PCT/CN2016/081739
Authority: WO
Inventors: 何建平
Original assignee: 华为技术有限公司
Priority date: 2016-05-11
Filing date: 2016-05-11
Publication date: 2017-11-16
Also published as: CN108370607A

Abstract

Provided are a digital unit, a radio unit, a base station and a data transmission method, relating to the field of communications, and reducing the requirement, of data transmitted between the digital unit and the radio unit, for a transmission bandwidth. The digital unit comprises a PDCP functional module and an RRC functional module, wherein the RRC functional module is used to acquire a first data packet and send the first data packet to the PDCP functional module; and the PDCP functional module is used to receive the first data packet sent by the RRC functional module, encapsulate the first data packet according to a PDCP so as to generate a first PDCP data packet, and send the first PDCP data packet to a first RU.

Description

Digital unit, wireless unit, base station and data transmission method

Technical field

The present application relates to the field of communications, and in particular, to a digital unit, a wireless unit, a base station, and a data transmission method.

Background technique

The architecture of distributed base stations is commonly used in existing radio access networks. As shown in FIG. 1, a typical distributed base station includes three RUs (Radio Units) and one DU (Didital Unit). The interface between the DU and each RU adopts the CPRI (Common Public Radio Interface) protocol, and the data transmitted through the CPRI is a baseband I/Q (In-phase/Quadrature) with high latency requirements. )data.

LTE (Long Term Evolution) systems usually support 20 MHz (megahertz) bandwidth. In order to increase processing performance, multiple antennas are usually configured in LTE systems. According to the layout of the existing DU and RU, as the number of antennas continues to increase, the amount of data of baseband I/Q data transmitted between the DU and the RU is multiplied. Based on the high latency requirements of baseband I/Q data, the baseband I/Q data requires a large transmission bandwidth when the amount of data in the baseband I/Q data is multiplied.

Taking 2T2R (double-shot and dual-receipt), bandwidth of 20MHz, and sampling rate of 30.72M/s (megabits/second) as an example, if the signal bit width of baseband I/Q data is 15bit (bit), the CPRI interface in a single cell The required transmission bandwidth is:

Transmission bandwidth = (I signal bit width + Q signal bit width) × sampling rate × number of antennas × 10 / 8 × 16 / 15

=(15+15)bit×30.72M/s×2×10/8×16/15

=2.4576Gbps

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.

Correspondingly, there are a large number of antennas (for example: 4T4R (four rounds and four rounds), 8T8R (eight In the application scenario, the required transmission bandwidth will be multiplied by 2.4576 Gbps, and the required transmission bandwidth will be very large.

Summary of the invention

Embodiments of the present application provide a digital unit, a wireless unit, a base station, and a data transmission method, which can reduce the transmission bandwidth requirement of data transmitted between the digital unit and the wireless unit.

To achieve the above objective, the embodiment of the present application adopts the following technical solutions:

In a first aspect, an embodiment of the present application provides a digital unit DU, where the DU includes a packet data compression protocol PDCP function module and a radio resource control RRC function module.

Specifically, the functions implemented by each unit module provided by the embodiment of the present application are specifically as follows:

The RRC function module is configured to acquire a first data packet including at least a payload, and send the first data packet to the PDCP function module.

The PDCP function module is configured to receive a first data packet sent by the RRC function module, encapsulate a first data packet that is received according to the PDCP, to generate a first PDCP data packet, and send the first PDCP to the first RU. data pack.

In the downlink direction, the data transmitted between the DU and the first RU in the embodiment of the present application is a first PDCP data packet, and the first PDCP data packet is obtained by encapsulating the first data packet received by the PDCP function module. The first PDCP data packet includes a PDCP header and a payload. Compared with the baseband I/Q data, the first PDCP data packet has a relatively low latency requirement, so that the first PDCP data packet requires a transmission bandwidth. It is also relatively low, which helps to reduce the amount of data exchanged between the digital unit and the wireless unit, thereby reducing the need for transmission bandwidth.

Further, the foregoing PDCP function module is specifically configured to send the first PDCP data packet to the first RU by using an Ethernet.

The first PDCP data packet transmitted between the DU and the first RU in the embodiment of the present application can be transmitted by using an ordinary Ethernet. The Ethernet is a mature network in the existing stage, so that the direct connection between the DU and the first RU is directly It can be connected via Ethernet, and the deployment is simple and convenient. In the current phase, the cost of laying out using Ethernet is lower.

Specifically, the foregoing RRC function module is specifically configured to receive, sent by a core network device, The downlink data packet is processed according to the RRC protocol to generate a first data packet.

In addition, on the control plane, the foregoing RRC function module and the PDCP function module both send signaling and receive signaling according to the provisions of the corresponding existing protocols.

In a second aspect, the embodiment of the present application provides a wireless unit RU, where the RU includes a radio link control RLC function module, a media access control MAC function module, a physical PHY function module, and an intermediate frequency IRF function module.

The RLC function module is configured to receive a first PDCP data packet sent by the digital unit DU, and to encapsulate the first PDCP data packet according to the RLC protocol, to generate a second data packet, and send the foregoing to the MAC function module. Two packets.

The MAC function module is configured to receive a second data packet sent by the RLC function module, encapsulate a second data packet according to a MAC protocol, to generate a third data packet, and send the third data packet to the PHY function module;

The PHY function module is configured to receive a third data packet sent by the MAC function module, convert the third data packet into a first data stream according to the PHY protocol, and send the first data stream to the IRF function module;

The IRF function module is configured to receive the first data stream sent by the PHY function module, process the first data stream according to the IRF protocol, generate a data stream to be sent, and send the data stream to be sent.

The data transmitted between the DU and the first RU in the embodiment of the present application is also the first PDCP data packet including the PDCP header and the payload, and the baseband I/Q data is corresponding to the previous embodiment. In contrast, the first PDCP data packet has a relatively low latency requirement, so that the first PDCP data packet has a relatively low transmission bandwidth requirement, which is advantageous for reducing the amount of data exchanged between the digital unit and the wireless unit. Thereby reducing the need for transmission bandwidth.

Further, the foregoing RLC function module is specifically configured to receive, by using an Ethernet, a first PDCP data packet sent by the DU.

Ethernet is a mature network in the existing stage, and deployment is simple and convenient. Existing order Segments, using Ethernet for lower layout costs.

In addition, on the control plane, the above RLC function module, MAC function module, PHY function module and IRF function module all send signaling and receive signaling according to the provisions of the corresponding existing protocols.

In a third aspect, another embodiment of the present application provides a digital unit DU, where the DU includes a packet data compression protocol PDCP function module and a radio resource control RRC function module.

The PDCP function module is configured to receive a second PDCP data packet sent by the first RU, and to decapsulate the second PDCP data packet, to obtain a fourth data packet, where the fourth data packet includes at least a payload, and is used to The RRC function module sends a fourth data packet.

The RRC function module is configured to receive the fourth data packet sent by the PDCP function module, process the fourth data packet according to the RRC protocol, generate an uplink data packet, and send the uplink data packet to the core network device.

In the uplink direction, the data transmitted between the DU and the first RU in the embodiment of the present application is a second PDCP data packet. Compared with the baseband I/Q data, the second PDCP data packet has a relatively low latency requirement. In this case, the second PDCP data packet has a relatively low requirement on the transmission bandwidth, which is beneficial to reducing the amount of data exchanged between the digital unit and the wireless unit, thereby reducing the transmission bandwidth requirement.

Further, the foregoing PDCP function module is specifically configured to receive, by using an Ethernet, a second PDCP data packet sent by the first RU.

Ethernet is a mature network in the existing stage, and deployment is simple and convenient. In the current phase, the cost of laying out using Ethernet is lower.

In a fourth aspect, another embodiment of the present application provides a wireless unit RU, where the RU includes: a radio link control RLC function module, a media access control MAC function module, a physical PHY function module, and an intermediate frequency IRF function module.

The IRF function module is used to obtain a user data stream, and is based on an IRF protocol. The user data stream is processed to generate a second data stream and send a second data stream to the PHY function module.

The PHY function module is configured to receive the second data stream sent by the IRF function module, convert the second data stream into a fifth data packet according to the PHY protocol, and send the fifth data packet to the MAC function module. .

The MAC function module is configured to receive a fifth data packet sent by the PHY function module, and decapsulate the fifth data packet according to the MAC protocol, to obtain a sixth data packet, and send the sixth data packet to the RLC function module. .

The RLC function module is configured to receive a sixth data packet sent by the MAC function module, and decapsulate the sixth data packet according to the RLC protocol, to obtain the second PDCP data packet, and send the second PDCP data packet to the digital unit DU. .

Corresponding to the previous embodiment, the data transmitted between the DU and the first RU in the embodiment of the present application is a second PDCP data packet, and the second PDCP data packet has a delay requirement compared with the baseband I/Q data. Relatively low, in this case, the second PDCP data packet has a relatively low demand for transmission bandwidth, which is advantageous for reducing the amount of data exchanged between the digital unit and the wireless unit, thereby reducing the transmission bandwidth requirement.

Further, the foregoing RLC function module is specifically configured to send a second PDCP data packet to the digital unit DU through the Ethernet.

In a fifth aspect, the embodiment of the present application provides a base station, including the digital unit DU according to any one of the preceding claims, and the wireless unit RU according to any one of the preceding claims, wherein the DU and each RU pass through an Ethernet network. connection.

For the technical effects of the base station provided by the embodiment of the present application, reference may be made to the technical effects of the DU in the foregoing embodiment and the technical effects of the RU in the foregoing embodiment, and details are not described herein again.

In a sixth aspect, an embodiment of the present application provides a data transmission method, where the data transmission method is applied to a base station as described above, where the base station includes a digital unit DU and at least one wireless unit RU.

Specifically, the data transmission method provided by the embodiment of the present application is: acquiring in the DU After the first data packet including the payload is included, the DU encapsulates the first data packet that is acquired according to the packet data compression protocol (PDCP), generates a first PDCP data packet, and then the DU sends the first PDCP data packet to the first RU, where The first RU is any one of at least one RU.

It can be seen that after the first data packet is obtained by the DU in the embodiment of the present application, the DU encapsulates the first data packet to obtain the first PDCP data packet, and after acquiring the first PDCP data packet, the DU The first RU sends the first PDCP data packet. Compared with the baseband I/Q data, the first PDCP data packet has a relatively low latency requirement, so that the first PDCP data packet has a relatively low transmission bandwidth requirement, which is advantageous for reducing the digital unit and the wireless unit. The amount of data that interacts between them, thereby reducing the need for transmission bandwidth.

Specifically, the method for the DU to send the first PDCP data packet to the first RU may be: the DU sends the first PDCP data packet to the first RU by using the Ethernet.

The first PDCP data packet sent by the DU to the RU in the embodiment of the present application can be transmitted through a common Ethernet. The Ethernet is a mature network in the existing stage, so that the DU and the RU can be directly connected through the Ethernet. The deployment is simple and convenient. In the current phase, the cost of laying out using Ethernet is lower.

In a seventh aspect, the embodiment of the present application provides a data transmission method, where the data transmission method is applied to a base station as in the foregoing embodiment, where the base station includes a digital unit DU and at least one wireless unit RU.

For the first RU in the at least one RU, the data transmission method is: after the first RU receives the first packet data compression protocol PDCP data packet sent by the DU, the first RU processes the first PDCP data packet according to the preset protocol. , generating a data stream to be sent, and sending the data stream to be sent.

Corresponding to the previous embodiment, the first RU in the embodiment of the present application receives the first PDCP data packet sent by the DU, that is, the data transmitted between the DU and the first RU in the embodiment of the present application is the first PDCP data packet. Compared with the baseband I/Q data, the first PDCP data packet has a relatively low latency requirement, so that the first PDCP data packet has a relatively low transmission bandwidth requirement, which is advantageous for reducing the digital unit and the wireless unit. The amount of data that interacts between them, thereby reducing the need for transmission bandwidth.

Specifically, the method for the first RU to receive the first PDCP data packet sent by the DU may be: the first RU receives the first PDCP data packet sent by the DU through the Ethernet.

Similarly, the first PDCP data packet transmitted between the DU and the first RU in the embodiment of the present application can be transmitted through a common Ethernet, and the Ethernet is a mature network in the existing stage, so that the DU and the first RU It can be directly connected via Ethernet, and the deployment is simple and convenient. In the current phase, the cost of laying out using Ethernet is lower.

Specifically, the first RU processes the first PDCP data packet according to the preset protocol, and the method for generating the data flow to be sent is: first, the first RU encapsulates the first PDCP data packet according to the radio link control RLC protocol, Generating a second data packet. Second, the first RU encapsulates the second data packet according to the medium access control MAC protocol to generate a third data packet. Then, the first RU converts the third data packet into the first according to the physical PHY protocol. Data stream; Finally, the first RU processes the first data stream according to the intermediate frequency IRF protocol to generate a data stream to be sent.

It is easy to understand that the method for the first RU to process the first PDCP data packet according to the preset protocol to generate the data stream to be sent is actually processing the data packet by using each protocol layer according to the flow direction of the data packet, and The process is the same as the existing protocol and will not be described in detail here.

In an eighth aspect, an embodiment of the present application provides a data transmission method, where the data transmission method is applied to a base station as in the foregoing embodiment, where the base station includes a digital unit DU and at least one wireless unit RU.

Specifically, the data transmission method provided by the embodiment of the present application is: after receiving the second packet data compression protocol PDCP data packet sent by the first RU (any one of the at least one RU), the DE decapsulates the second packet according to the PDCP. The PDCP data packet acquires a fourth data packet, where the fourth data packet includes at least a payload; then, the DU processes the fourth data packet according to the RRC protocol of the radio resource control to generate an uplink data packet, and finally, the DU sends the uplink data packet to the core network device. Upstream packet.

It is easy to understand that the data transmitted between the DU and the RU in the embodiment of the present application is uplink data. The data received by the DU in the embodiment of the present application is the second PDCP data packet sent by the first RU, that is, the data transmitted between the DU and the first RU in the embodiment of the present application is The second PDCP packet. Compared with the baseband I/Q data, the second PDCP data packet has a relatively low latency requirement, so that the second PDCP data packet has a relatively low transmission bandwidth requirement, which is advantageous for reducing the digital unit and the wireless unit. The amount of data that interacts between them, thereby reducing the need for transmission bandwidth.

Specifically, the method for the DU to receive the second PDCP data packet sent by the first RU may be: the DU receives the second PDCP data packet sent by the first RU by using the Ethernet.

The second PDCP data packet transmitted between the DU and the first RU in the embodiment of the present application can be transmitted through a common Ethernet. The Ethernet is a mature network in the existing phase, so that the direct connection between the DU and the first RU is directly It can be connected via Ethernet, and the deployment is simple and convenient. In the current phase, the cost of laying out using Ethernet is lower.

In a ninth aspect, the embodiment of the present application provides a data transmission method, where the data transmission method is applied to a base station according to the foregoing embodiment, where the base station includes a digital unit DU and at least one wireless unit RU.

For the first RU in the at least one RU, the data transmission method provided by the embodiment of the present application is: after acquiring the user data stream, the first RU processes the user data stream according to a preset protocol, and generates a second packet data compression protocol. The PDCP packet, and then the first RU sends a second PDCP packet to the DU.

It can be seen that the first RU in the embodiment of the present application sends the second PDCP data packet to the DU. Compared with the baseband I/Q data, the second PDCP data packet has a relatively low latency requirement, so that the second PDCP data packet has a relatively low transmission bandwidth requirement, which is advantageous for reducing the digital unit and the wireless unit. The amount of data that interacts between them, thereby reducing the need for transmission bandwidth.

Specifically, the method for the first RU to send the second PDCP data packet to the DU may be: the first RU sends the second PDCP data packet to the DU through the Ethernet.

Ethernet is a mature network in the existing stage, so that the DU and the first RU can be directly connected through Ethernet, and the deployment is simple and convenient. In the current phase, the cost of laying out using Ethernet is lower.

Specifically, the first RU processes the user data stream according to the preset protocol, and the method for generating the second PDCP data packet is: first, the first RU is according to the intermediate frequency IRF protocol. The user data stream is processed to generate a second data stream; secondly, the first RU converts the second data stream into a fifth data packet according to the physical PHY protocol; then, the first RU decapsulates the fifth data packet according to the MAC protocol to obtain The sixth data packet; finally, the first RU decapsulates the sixth data packet according to the RLC protocol to obtain the second PDCP data packet.

It is easy to understand that the method for processing the user data stream according to the preset protocol to generate the second PDCP data packet is actually processing the data packet according to the flow direction of the data packet by using each protocol layer, and the processing procedure is The same as the existing agreement, no detailed description will be given here.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present application.

1 is a schematic structural diagram of a distributed base station;

2 is a schematic diagram of a protocol stack in a base station of an LTE communication system;

3 is a schematic structural diagram 1 of a digital unit according to an embodiment of the present application;

4 is a schematic structural diagram 1 of a wireless unit according to an embodiment of the present application;

FIG. 5 is a schematic structural diagram 2 of a digital unit according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram 2 of a wireless unit according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present application;

FIG. 8 is a schematic flowchart 1 of a data transmission method according to an embodiment of the present disclosure;

FIG. 9 is a schematic flowchart 2 of a data transmission method according to an embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application are clearly and completely described in the following with reference to the drawings in the embodiments of the present application. It is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

In the following description, for purposes of explanation and description, reference, However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other cases, omitting the well-known mobile device, The detailed description of the circuits and methods are provided to avoid obscuring the description of the present application.

In addition, the term "and/or" herein is merely an association relationship describing an associated object, indicating that there may be three relationships, for example, A and/or B, which may indicate that A exists separately, and A and B exist at the same time. There are three cases of B alone. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

When the embodiments of the present application refer to ordinal numbers such as "first", "second" and the like, unless it is intended to express the order according to the context, it should be understood as merely distinguishing.

The various technologies described herein can be used in various wireless network systems, such as GSM (Global System for Mobile Communications), CDMA (Code Division Multiple Access) 2000 system, and wideband code division. WCDMA (Wideband Code Division Multiple Access wireless), Long Term Evolution (LTE) system, and other such communication systems.

Currently, a wireless communication system is constructed by dividing tasks to be performed between a plurality of protocol layers, each node or entity in the system being configured to process data at each protocol layer in the protocol stack, wherein Logically corresponding protocol layers can communicate with each other.

2 shows a protocol stack composed of a layer 1 protocol, a layer 2 protocol, and a layer 3 protocol in a base station based on an LTE communication system.

The Layer 1 protocol includes an IRF (Tntermediate Radio Frequence) layer and a PHY layer (Physical Layer). The IRF layer is mainly used to implement RF functions such as filtering, digital-to-analog conversion (D/A conversion), analog-to-digital conversion (A/D conversion), up-down conversion, and power amplification. The PHY layer is mainly used for mapping service data to physical channels.

The Layer 2 protocol includes a MAC (Media Access Control) layer, an RLC (Radio Link Control) layer, and a Packet Data Convergence Protocol (PDCP) layer.

The MAC layer is mainly used to manage the HARQ (Hybrid Automatic Repeat reQuest) function and the scheduling of service data. The RLC layer is mainly used for segmentation/cascading, retransmission, and in-order delivery of business data. PDCP layer master It is used to compress and decompress IP (Internet Protocol) protocols, encrypt and decrypt service data, and transmit service data.

The Layer 3 protocol includes an RRC (Radio Resource Control) layer. The RRC layer is mainly used to provide system information broadcasting, RRC connection control, mobility management, mobility measurement, and the like.

Currently, in an LTE communication system, a distributed base station architecture in which a DU is separated from an RU is generally used. The DU is responsible for the processing of the RRC, PDCP layer, RLC layer, MAC layer, and PHY layer, including high-level data transmission, scheduling, and baseband signal processing. The RU is responsible for the processing of the IRF layer, and mainly implements up-conversion of signals, power amplifiers, filtering, and conversion of medium-frequency signals. A DU can be connected to multiple RUs, and a fiber connection is used between the DU and the RU. Baseband I/Q data is transmitted between the DU and the RU through a standard CPRI.

Since the data amount of the baseband I/Q data is generally large, and the baseband I/Q data has a relatively high delay requirement, the baseband I/Q transmitted between the DU and the RU increases as the number of antennas on the base station increases. The amount of data in the data is multiplied, making the baseband I/Q data very demanding on the transmission bandwidth.

In response to the above problems, the present application provides a digital unit, a wireless unit, a base station, and a data transmission method. By adjusting an existing digital unit and a functional module included in the wireless unit, the baseband I/ is no longer transmitted between the digital unit and the wireless unit. Q data, thereby reducing the transmission bandwidth between the digital unit and the wireless unit.

The embodiment of the present application provides a digital unit DU. As shown in FIG. 3, the DU includes a packet data compression protocol PDCP function module 30 and a radio resource control RRC function module 31.

The RRC function module 31 is configured to acquire a first data packet including at least a payload, and send the first data packet to the PDCP function module 30.

The PDCP function module 30 is configured to receive a first data packet sent by the RRC function module 11, encapsulate the first data packet according to the PDCP, to generate a first PDCP data packet, and send the first data packet to the first RU The first PDCP packet is described.

Further, the PDCP function module 30 is specifically configured to send the first PDCP data packet to the first RU by using an Ethernet.

Specifically, the RRC function module 31 is configured to receive a downlink data packet sent by the core network device, process the downlink data packet according to an RRC protocol, and generate a first data packet.

It should be noted that the RRC function module is a 3GPP (3rd Generation Partnership Project) network term, and functional entities with similar functions may exist in other non-3GPP networks, but are not named as RRC function modules. . Therefore, the RRC function module in the embodiment of the present application is used to indicate a function module having a similar function.

Similarly, the PDCP function module in the embodiment of the present application is used to indicate a function module having similar functions.

The RRC function module processes the data packets obtained by the RRC function module according to the existing RRC protocol, and the PDCP function modules process the data packets obtained by the PDCP function module according to the existing PDCP.

In addition, on the control plane, the PDCP function module 30 and the RRC function module 31 in the embodiment of the present application send signaling and receive signaling according to the provisions of the corresponding existing protocols, and details are not described herein again.

The data transmitted between the DU and the first RU in the embodiment of the present application is a first PDCP data packet including a PDCP packet header and a payload. Compared with the baseband I/Q data, the first PDCP data packet has a relative delay requirement. Lower, in this case, the first PDCP data packet has a relatively low demand for transmission bandwidth, which is beneficial to reduce the amount of data exchanged between the digital unit and the wireless unit, thereby reducing the transmission bandwidth requirement.

The embodiment of the present application provides a wireless unit RU. As shown in FIG. 4, the RU includes The radio link controls the RLC function module 40, the medium access control MAC function module 41, the physical PHY function module 42, and the intermediate frequency IRF function module 43.

The RLC function module 40 is configured to receive a first PDCP data packet sent by the digital unit DU, and to encapsulate the first PDCP data packet according to an RLC protocol, to generate a second data packet, and to send to the MAC The function module 41 transmits the second data packet.

The MAC function module 41 is configured to receive the second data packet sent by the RLC function module 40, encapsulate the second data packet according to a MAC protocol, to generate a third data packet, and to use the PHY The function module 42 sends the third data packet.

The PHY function module 42 is configured to receive the third data packet sent by the MAC function module 41, convert the third data packet into a first data stream according to a PHY protocol, and send the third data packet to the IRF function module 43. Sending the first data stream.

The IRF function module 43 is configured to receive the first data stream sent by the PHY function module 42, process the first data stream according to an IRF protocol, generate a data stream to be sent, and The data stream to be sent is sent.

Further, the RLC function module 40 is specifically configured to receive, by using an Ethernet, the first PDCP data packet sent by the DU.

It should be noted that the RLC function module is a 3GPP network term, and functional entities having similar functions may exist in other non-3GPP networks, but are not named as RLC function modules. Therefore, the RLC function module in the embodiment of the present application is used to indicate a function module having a similar function.

Similarly, the MAC function module, the RHY function module, and the IRF function module in the embodiments of the present application are also respectively used to indicate functional modules having similar functions.

The above MAC function modules process the data packets received by the MAC function module according to the existing MAC protocol, and the RHY function modules receive the data packets according to the existing RHY protocol. The data packet is processed, and the above IRF function module processes the data packet received by the IRF function module according to the existing IRF protocol.

In addition, on the control plane, the RLC function module 40, the MAC function module 41, the PHY function module 42 and the IRF function module 43 in the embodiments of the present application all send signaling and receive signaling according to the provisions of the corresponding existing protocols. Details will not be repeated here.

The embodiment of the present application provides a digital unit DU. As shown in FIG. 5, the DU includes a packet data compression protocol PDCP function module 50 and a radio resource control RRC function module 51.

The PDCP function module 50 is configured to receive a second PDCP data packet sent by the first RU, and to decapsulate the second PDCP data packet, to obtain a fourth data packet, where the fourth data packet includes at least a net And for transmitting the fourth data packet to the RRC function module.

The RRC function module 51 is configured to receive the fourth data packet sent by the PDCP function module 50, process the fourth data packet according to an RRC protocol, generate an uplink data packet, and send the uplink data packet to the core network device. The uplink data packet.

Further, the PDCP function module 50 is specifically configured to receive, by using an Ethernet, a second PDCP data packet sent by the first RU.

The second PDCP data packet transmitted between the DU and the first RU in the embodiment of the present application can be transmitted by using an ordinary Ethernet. The Ethernet is a mature network in the existing stage, so that the direct connection between the DU and the first RU is directly It can be connected via Ethernet, and the deployment is simple and convenient. In the current phase, the cost of laying out using Ethernet is lower.

It should be noted that the RRC function module is 3GPP (3rd Generation Partnership). Project, 3rd Generation Partnership Project) Network terminology, functional entities with similar functions may exist in other non-3GPP networks, but are not named RRC functional modules. Therefore, the RRC function module in the embodiment of the present application is used to indicate a function module having a similar function.

In addition, on the control plane, the PDCP function module 50 and the RRC function module 51 in the embodiment of the present application send signaling and receive signaling according to the provisions of the corresponding existing protocols, and details are not described herein again.

The data transmitted between the DU and the first RU in the embodiment of the present application is a second PDCP data packet. Compared with the baseband I/Q data, the second PDCP data packet has a relatively low latency requirement. The demand for transmission bandwidth of the second PDCP data packet is also relatively low, which is beneficial to reducing the amount of data exchanged between the digital unit and the wireless unit, thereby reducing the transmission bandwidth requirement.

The embodiment of the present application provides a wireless unit RU. As shown in FIG. 6, the RU includes a radio link control RLC function module 60, a medium access control MAC function module 61, a physical PHY function module 62, and an intermediate frequency IRF function module 63.

The IRF function module 63 is configured to acquire a user data stream, process the user data stream according to an IRF protocol, generate a second data stream, and send the second data stream to the PHY function module 62.

The PHY function module 62 is configured to receive the second data stream sent by the IRF function module 63, and convert the second data stream into a fifth data packet according to a PHY protocol, and used to send to the MAC The function module 61 transmits the fifth data packet.

The MAC function module 61 is configured to receive the PHY function module 62 to send And the fifth data packet, and decapsulating the fifth data packet according to a MAC protocol, to obtain a sixth data packet, and configured to send the sixth data packet to the RLC function module 60.

The RLC function module 60 is configured to receive the sixth data packet sent by the MAC function module 61, and decapsulate the sixth data packet according to an RLC protocol, to obtain a second PDCP data packet, and use a digital data packet. The unit DU transmits the second PDCP data packet.

Further, the RLC function module 60 is specifically configured to send the second PDCP data packet to the digital unit DU through the Ethernet.

The above MAC function modules process the data packets received according to the existing MAC protocol, and the RHY function modules process the data packets received according to the existing RHY protocol, and the IRF function modules are all based on the existing IRF protocol. Process the packets it receives.

In addition, on the control plane, the RLC function module 60, the MAC function module 61, the PHY function module 62, and the IRF function module 63 in the embodiments of the present application all send signaling and receive signaling according to the provisions of the corresponding existing protocols. Details will not be repeated here.

The data transmitted between the DU and the first RU in the embodiment of the present application is a second PDCP data packet. Compared with the baseband I/Q data, the second PDCP data packet has a relatively low latency requirement. The demand for transmission bandwidth of the second PDCP data packet is also relatively low, which is beneficial to reducing the amount of data exchanged between the digital unit and the wireless unit, thereby reducing The need for transmission bandwidth.

An embodiment of the present application provides a base station, as shown in FIG. 7, including a digital unit DU 70 as described in the foregoing embodiment, and at least one wireless unit RU 71 as described in the foregoing embodiment, wherein the DU 70 and each The RUs 71 are connected via Ethernet.

For a more detailed processing procedure implemented by the DU 70, refer to the description of the DU above, and details are not described herein again.

For the same reason, for a more detailed processing flow implemented by each RU 71, please refer to the above description of the RU, which will not be described in detail herein.

An embodiment of the present application provides a base station, where the base station includes a DU and at least one RU. The embodiment of the present application adjusts the internal functional structure of the DU and the RU in the base station, so that the data transmitted between the DU and each RU is a PDCP data packet. Compared with the baseband I/Q data, the PDCP data packet has a relative delay requirement. Lower, in this case, the PDCP data packet has a relatively low demand for transmission bandwidth, which is beneficial to reduce the amount of data exchanged between the digital unit and the wireless unit, thereby reducing the transmission bandwidth requirement.

The embodiment of the present application provides a data transmission method, which is applied to a base station as described in the foregoing embodiment, where the base station includes a DU and at least one RU.

Specifically, in the application scenario of transmitting the downlink data, the DU sends the downlink data to the first RU (any one of the at least one RU). As shown in FIG. 8, the data transmission method provided by the embodiment of the present application includes:

S801. The DU acquires a first data packet that includes at least a payload.

S802. The DU encapsulates the first data packet according to the PDCP, and generates a first PDCP data packet.

S803. The DU sends the first PDCP data packet to the first RU.

S804. The first RU receives the first PDCP data packet sent by the DU.

S805. The first RU processes the first PDCP data packet according to a preset protocol, and generates a data flow to be sent.

S806. The first RU sends the data stream to be sent.

Specifically, the first data packet obtained by the DU in the embodiment of the present application is the DU receiving the core. After the downlink data transmitted by the network device, the downlink data is processed according to the RRC protocol.

The process of processing the downlink data by the DU according to the RRC protocol is the same as the process of processing the downlink data by the RRC function module in the prior art, and details are not described herein again.

In the embodiment of the present application, the DU is connected to the first RU through an Ethernet. Therefore, the DU sends the first PDCP data packet to the first RU through the Ethernet.

Since Ethernet is a mature network in the existing phase, the deployment of the DU and the first RU can directly utilize the deployed Ethernet, so that the deployment cost of the DU and the first RU will be greatly reduced.

Specifically, the first RU processes the first PDCP data packet according to the preset protocol, and the method for generating the data flow to be sent is: first, the first RU encapsulates the first PDCP data packet according to the RLC protocol, to generate the second data packet. Secondly, the first RU encapsulates the second data packet according to the MAC protocol to generate a third data packet; then, the first RU converts the third data packet into the first data stream according to the PHY protocol; finally, the first RU according to the IRF protocol The first data stream is processed to generate a data stream to be sent.

It can be understood that, the foregoing method for processing, by the first RU, the first PDCP data packet to generate a data stream to be sent according to a preset protocol, is that the first RU uses the first function of the functional module to be included by the first RU. The process of processing packets separately.

Specifically, in the application scenario of transmitting the uplink data, the first RU sends the uplink data to the DU. As shown in FIG. 9, the data transmission method provided by the embodiment of the present application includes:

S901. The first RU acquires a user data stream.

S902. The first RU processes the user data stream according to a preset protocol, and generates a second PDCP data packet.

S903. The first RU sends a second PDCP data packet to the DU.

S904. The DU receives the second PDCP data packet sent by the first RU.

S905. The DU decapsulates the second PDCP data packet according to the PDCP, and includes at least a fourth data packet of the payload.

S906. The DU processes the fourth data packet according to the RRC protocol to generate an uplink number. According to the package.

S907. The DU sends an uplink data packet to the core network device.

Specifically, in the embodiment of the present application, the first RU processes the user data stream according to the preset protocol, and the method for generating the second PDCP data packet is: first, the first RU processes the user data stream according to the IRF protocol, and generates a second a data stream; secondly, the first RU converts the second data stream into a fifth data packet according to the PHY protocol; then, the first RU decapsulates the fifth data packet according to the MAC to obtain the sixth data packet; and finally, the first RU is based on the RLC The protocol decapsulates the sixth data packet to obtain the second PDCP data packet.

It can be understood that, the foregoing method for processing, by using the preset protocol, the user data stream to generate the second PDCP data packet is: the first RU uses the function modules included in the first RU to separately perform the received user data stream. The process of processing.

In the embodiment of the present application, whether the DU sends downlink data to the first RU or the first RU sends uplink data to the DU, the data transmitted between the two is a PDCP data packet. Compared with baseband I/Q data, PDCP data packets have relatively low latency requirements. Therefore, PDCP data packets have relatively low transmission bandwidth requirements, which is beneficial to reduce the amount of data exchanged between DUs and RUs. , thereby reducing the need for transmission bandwidth.

Illustratively, taking 2T2R as an example, according to the protocol 3GPP TS36.213, the transmission bandwidth of the single antenna is 75 Mbps, the data transmission method provided by the embodiment of the present application is adopted, and the transmission bandwidth required for the PDCP data packet in the single cell is 150 Mbps. (75 × 2 = 150), considering other overheads, the transmission bandwidth required for PDCP packets in a single cell is approximately 190 Mbps. In the same scenario, if the baseband I/Q data is transmitted between the RU and the first DU, the required bandwidth of the baseband I/Q data in the single cell is 2.4576 Gbps.

It is easy to draw that, with the data transmission method provided by the embodiment of the present application, the bandwidth required for the PDCP data packet transmitted between the DU and the first RU is only the baseband I/ transmitted between the prior art DU and the first RU. 7.7% of the bandwidth required for Q data (190/2457.6 = 7.7%).

In addition, it can be seen from the functions that can be realized by the existing PDCP layer that the data processed by the PDCP is encrypted, so that the security of the transmitted data can be ensured. Correspondingly, the data sent from the RLC layer to the PDCP layer is also encrypted.

The PDCP function module is located in the DU in the embodiment of the present application, and the RLC function module is located in the first RU. Therefore, the PDCP data packet transmitted between the DU and the first RU in the embodiment of the present application is also encrypted, so that the The security of data transmission between DU and RU.

Exemplarily, the base station implements multi-stream aggregation of LTE and WiFi by offloading downlink service data from the PDCP layer, transmitting first service data to the first RU, and transmitting second service data to the WiFi access point. Existing WiFi access points are based on cost considerations, and WiFi access points are unable to implement encryption and decryption. In the application scenario of the multi-stream aggregation of the LTE and the WiFi, the data transmission method provided by the embodiment of the present application is used, and the second service data received by the WiFi access point is encrypted, and the application is compared with the prior art. The data transmission method provided by the embodiment effectively improves the security of the WiFi access point.

Further, in the embodiment of the present application, the connection between the DU and the first RU through the Ethernet can not only reduce the deployment cost but also improve the deployment flexibility. Exemplarily, when the base station in the embodiment of the present application is used for adding or deleting an RU, only one device is added or deleted in the base station, and the configuration of the entire base station is not required to be adjusted.

It will be clearly understood by those skilled in the art that for the convenience and brevity of the description, only the division of each functional module described above is exemplified. In practical applications, the above function assignment can be completed by different functional modules as needed. The internal structure of the mobile device is divided into different functional modules to perform all or part of the functions described above. For the specific working process of the foregoing system, the mobile device and the unit, refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed system, mobile device and method may be implemented in other manners. For example, the mobile device embodiments described above are merely illustrative. For example, the division of the modules or units is only one logical function division. In actual implementation, there may be another division manner, such as multiple units or components. It can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, mobile device or unit, and may be in electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application, in essence or the contribution to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

The foregoing is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application. It should be covered by the scope of protection of this application. Therefore, the scope of protection of the present application should be determined by the scope of the claims.

Claims

A digital unit DU, wherein the DU includes: a packet data compression protocol PDCP function module and a radio resource control RRC function module;

The RRC function module is configured to acquire a first data packet, where the first data packet includes at least a payload, and send the first data packet to the PDCP function module;

The PDCP function module is configured to receive a first data packet sent by the RRC function module, encapsulate the first data packet according to the PDCP, to generate a first PDCP data packet, and send the first data packet to the first RU A PDCP packet.
A digital unit DU according to claim 1 wherein:

The PDCP function module is specifically configured to send the first PDCP data packet to the first RU by using an Ethernet.
A digital unit DU according to claim 1 or 2, characterized in that

The RRC function module is specifically configured to receive a downlink data packet sent by the core network device, process the downlink data packet according to an RRC protocol, and generate the first data packet.
A wireless unit (RU), wherein the RU comprises: a radio link control RLC function module, a medium access control MAC function module, a physical PHY function module, and an intermediate frequency IRF function module;

The RLC function module is configured to receive a first PDCP data packet sent by the digital unit DU, and to encapsulate the first PDCP data packet according to an RLC protocol, to generate a second data packet, and to use the MAC function The module sends the second data packet;

The MAC function module is configured to receive the second data packet sent by the RLC function module, encapsulate the second data packet according to a MAC protocol, to generate a third data packet, and to use the PHY function module Sending the third data packet;

The PHY function module is configured to receive the third data packet sent by the MAC function module, convert the third data packet into a first data stream according to a PHY protocol, and send the third data packet to the IRF function module. First data stream;

The IRF function module is configured to receive the first data stream sent by the PHY function module, and process the first data stream according to an IRF protocol to generate a to-be-sent Data stream, and for transmitting the data stream to be sent.
The wireless unit RU according to claim 4, characterized in that

The RLC function module is specifically configured to receive, by using an Ethernet, the first PDCP data packet sent by the DU.
A digital unit DU, wherein the DU includes: a packet data compression protocol PDCP function module and a radio resource control RRC function module;

The PDCP function module is configured to receive a second PDCP data packet sent by the first RU, and to decapsulate the second PDCP data packet according to the PDCP, to obtain a fourth data packet, where the fourth data packet includes at least a payload, and configured to send the fourth data packet to the RRC function module;

The RRC function module is configured to receive the fourth data packet sent by the PDCP function module, process the fourth data packet according to an RRC protocol, generate an uplink data packet, and send the Upstream packet.
The digital unit DU according to claim 6, characterized in that

The PDCP function module is specifically configured to receive, by using an Ethernet, a second PDCP data packet sent by the first RU.
A wireless unit (RU), wherein the RU comprises: a radio link control RLC function module, a medium access control MAC function module, a physical PHY function module, and an intermediate frequency IRF function module;

The IRF function module is configured to acquire a user data stream, process the user data stream according to an IRF protocol, generate a second data stream, and send the second data stream to the PHY function module;

The PHY function module is configured to receive the second data stream sent by the IRF function module, and convert the second data stream into a fifth data packet according to a PHY protocol, and used to send the MAC function module Sending the fifth data packet;

The MAC function module is configured to receive the fifth data packet sent by the PHY function module, and decapsulate the fifth data packet according to a MAC protocol, to obtain a sixth data packet, and used to send the RLC The function module sends the sixth data packet;

The RLC function module is configured to receive the first part sent by the MAC function module Six data packets, and decapsulating the sixth data packet according to the RLC protocol to obtain a second PDCP data packet, and transmitting the second PDCP data packet to the digital unit DU.
The wireless unit RU according to claim 8, wherein

The RLC function module is specifically configured to send the second PDCP data packet to the digital unit DU by using an Ethernet.
A base station, comprising a digital unit DU according to any one of claims 1-3, and at least one wireless unit RU according to any one of claims 4-5, or comprising The digital unit DU according to any one of claims 6 to 7 and at least one wireless unit RU according to any one of claims 8 to 9, wherein the DU is connected to each RU via a network.
A data transmission method, which is applied to the base station according to claim 10, the base station includes a digital unit DU and at least one wireless unit RU, and the data transmission method includes:

Obtaining, by the DU, a first data packet, where the first data packet includes at least a payload;

The DU encapsulates the first data packet according to a packet data compression protocol (PDCP) to generate a first PDCP data packet;

Sending, by the DU, the first PDCP data packet to a first RU, where the first RU is any one of the at least one RU.
The data transmission method according to claim 11, wherein the sending, by the DU, the first PDCP data packet to the first RU comprises:

The DU sends the first PDCP data packet to the first RU through an Ethernet.
A data transmission method, characterized in that it is applied to a base station according to claim 10, the base station comprising a digital unit DU and at least one wireless unit RU, for the first RU of the at least one RU, the data Transmission methods include:

Receiving, by the first RU, a first packet data compression protocol PDCP data packet sent by the DU;

The first RU processes the first PDCP data packet according to a preset protocol, and generates a data stream to be sent;

The first RU sends the data stream to be sent.
The data transmission method according to claim 13, wherein the receiving, by the first RU, the first PDCP data packet sent by the DU comprises:

The first RU receives the first PDCP data packet sent by the DU by using an Ethernet.
The data transmission method according to claim 13 or 14, wherein the first RU processes the first PDCP data packet according to a preset protocol, and generates a data stream to be sent, which specifically includes:

The first RU encapsulates the first PDCP data packet according to a radio link control RLC protocol to generate a second data packet;

The first RU encapsulates the second data packet according to a media access control MAC protocol, to generate a third data packet;

Transmitting, by the first RU, the third data packet into a first data stream according to a physical PHY protocol;

The first RU processes the first data stream according to an intermediate frequency IRF protocol, and generates the data stream to be sent.
A data transmission method, which is applied to the base station according to claim 10, the base station includes a digital unit DU and at least one wireless unit RU, and the data transmission method includes:

Receiving, by the DU, a second packet data compression protocol PDCP data packet sent by the first RU, where the first RU is any one of the at least one RU;

Decoding, by the PDCP, the second PDCP data packet according to the PDCP, acquiring a fourth data packet, where the fourth data packet includes at least a payload;

The DU processes the fourth data packet according to a radio resource control RRC protocol, and generates an uplink data packet;

The DU sends the uplink data packet to a core network device.
The data transmission method according to claim 16, wherein the receiving, by the DU, the second PDCP data packet sent by the first RU comprises:

The DU receives the second PDCP data packet sent by the first RU by using the Ethernet.
A data transmission method, characterized in that it is applied to a base station according to claim 10, the base station comprising a digital unit DU and at least one wireless unit RU, For the first RU in the at least one RU, the data transmission method includes:

The first RU acquires a user data stream;

The first RU processes the user data stream according to a preset protocol, and generates a second packet data compression protocol PDCP data packet;

The first RU sends the second PDCP data packet to the DU.
The data transmission method according to claim 18, wherein the sending, by the first RU, the second PDCP data packet to the DU comprises:

The first RU sends the second PDCP data packet to the DU through an Ethernet.
The data transmission method according to claim 18 or 19, wherein the first RU processes the user data stream according to a preset protocol, and generates a second PDCP data packet, which specifically includes:

The first RU processes the user data stream according to an intermediate frequency IRF protocol, and generates a second data stream;

Converting, by the first RU, the second data stream to a fifth data packet according to a physical PHY protocol;

Decoding, by the first RU, the fifth data packet according to a media access control MAC protocol, to obtain a sixth data packet;

The first RU decapsulates the sixth data packet according to a radio link control RLC protocol to obtain a second PDCP data packet.