WO2017173659A1 - Procédé et dispositif de communication de données - Google Patents

Procédé et dispositif de communication de données Download PDF

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Publication number
WO2017173659A1
WO2017173659A1 PCT/CN2016/078841 CN2016078841W WO2017173659A1 WO 2017173659 A1 WO2017173659 A1 WO 2017173659A1 CN 2016078841 W CN2016078841 W CN 2016078841W WO 2017173659 A1 WO2017173659 A1 WO 2017173659A1
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Prior art keywords
downlink
data
rru
bbu
baseband
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PCT/CN2016/078841
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English (en)
Chinese (zh)
Inventor
张健
李元杰
任海豹
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华为技术有限公司
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Priority to PCT/CN2016/078841 priority Critical patent/WO2017173659A1/fr
Priority to CN201680084050.XA priority patent/CN108886714A/zh
Publication of WO2017173659A1 publication Critical patent/WO2017173659A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]

Definitions

  • the embodiments of the present invention relate to the field of wireless communications technologies, and in particular, to a data communication method and device.
  • CoMP Coordinated Multiple Points Transmission/Reception
  • C-RAN cloud radio access network
  • BBU baseband unit
  • RRU remote radio unit
  • the existing C-RAN architecture centralizes all digital signal processing units of the base station, including physical layer baseband processing, higher layer protocol processing, master control, and clock, etc., and connects the distributed RRU through the CPRI interface, and the RRU is only responsible for the digital-analog conversion.
  • RF transceiver function The existing C-RAN architecture centralizes all digital signal processing units of the base station, including physical layer baseband processing, higher layer protocol processing, master control, and clock, etc.
  • the data transmission rate on the CPRI interface in the above C-RAN architecture increases linearly with the number of antennas and the system bandwidth.
  • the long-term evolution LTE system bandwidth is 20 MHz, and 8 antennas are used, and the transmission traffic reaches 10 Gbps, which makes the BBU and the RRU.
  • the transmission bandwidth requirement is high.
  • the embodiments of the present invention provide a data communication method and device, so as to reduce the transmission bandwidth requirement between the BBU and the first RRU, reduce interference between different RRUs, improve system spectrum efficiency, and improve system capacity gain.
  • an embodiment of the present invention provides a data communication method, including:
  • the baseband processing unit BBU and the first radio remote unit RRU implement uplink data reception, where
  • the BBU includes a first physical layer functional unit for jointly processing uplink data of the first RRU;
  • the first physical layer function unit processes the uplink service data as uplink baseband data, and includes the following steps: fast inverse Fourier transform (IFFT) and removal of cyclic prefix CPin, resource inverse mapping, multi-antenna inverse mapping, and quadrature amplitude. Demodulation, forward error correction decoding.
  • IFFT fast inverse Fourier transform
  • CPin resource inverse mapping
  • multi-antenna inverse mapping multi-antenna inverse mapping
  • quadrature amplitude quadrature amplitude
  • Demodulation forward error correction decoding.
  • the BBU and the second RRU implement downlink data transmission, where the second RRU includes a second physical layer functional unit for baseband processing of downlink data.
  • the BBU and the second RRU do not need to transmit the downlink baseband data of the high transmission traffic generated by the physical layer function unit to process the downlink data, which is beneficial to reducing the BBU and the second.
  • the transmission bandwidth requirement between the RRUs, and the BBU and the first RRU can receive and jointly process the uplink service data sent by the first RRU in the process of implementing the uplink data receiving, which is beneficial to reducing interference between different RRUs and improving System spectral efficiency, increasing system capacity gain.
  • the BBU further includes a media access control MAC layer and the above functional unit, where the second RRU further includes a radio frequency processing function unit, and the MAC layer and the foregoing functional unit Used to implement protocol functions of the non-physical layer.
  • the functional unit above the MAC layer is a functional unit corresponding to a protocol layer above the MAC layer in a protocol stack architecture of a Long Term Evolution (LTE) or LTE-A (Long Term Evaluation Advanced) system.
  • the method includes a radio resource control protocol RRC layer function unit, a packet data convergence PDCP layer function unit, and a radio link control RLC layer function unit.
  • the BBU further includes a MAC layer non-real-time processing and the above functional unit
  • the second RRU further includes a MAC layer real-time processing function unit and a radio frequency processing function unit.
  • the first physical layer functional unit of the BBU is further configured to implement a first baseband processing of the downlink data; correspondingly, a second second of the second RRU
  • the physical layer function unit is configured to implement second baseband processing of the downlink data;
  • the baseband processing of the downlink data includes the first baseband processing and the second baseband processing.
  • the BBU further includes a media access control MAC layer and functional units above
  • the second RRU further includes a radio frequency processing function unit, and the MAC layer and the above functional units are used to implement a protocol function of the non-physical layer.
  • the BBU and the second RRU implement downlink data transmission, including:
  • the BBU performs downlink scheduling decision according to the channel state information CSI and the downlink service data of the user equipment UE, and generates downlink scheduling information;
  • the BBU sends the downlink scheduling information and the downlink service data to the second RRU, where the downlink scheduling information is used to instruct the second RRU to process the downlink service data as a downlink baseband signal, and send the downlink baseband signal to the UE.
  • Downlink baseband data is used to instruct the second RRU to process the downlink service data as a downlink baseband signal, and send the downlink baseband signal to the UE.
  • the BBU and the second RRU implement downlink data transmission, including:
  • the BBU sends the downlink scheduling information and the downlink service data to the second RRU, where the downlink scheduling information is used to instruct the second RRU to determine downlink resource allocation information at each transmission time interval TTI, and And processing, according to the downlink resource allocation information, the downlink service data is downlink baseband data, and sending the downlink baseband data to the UE.
  • the BBU performs a downlink scheduling decision according to the CSI and the downlink service data of the UE, generates downlink scheduling information, and processes the downlink scheduling information and the downlink service data to be the first Downlink baseband data;
  • the BBU and the first RRU implement uplink data reception, including:
  • the BBU receives uplink service data sent by the first RRU, and processes the uplink service data as uplink baseband data.
  • an embodiment of the present invention provides a BBU, where the apparatus includes a functional unit, and the functional unit is used to perform some or all of the steps described in any one of the first aspects of the embodiments of the present invention.
  • an embodiment of the present invention provides a BBU, including: a memory, a processor, a communication interface, and a communication bus;
  • the memory, the processor and the communication interface are connected by the communication bus and complete communication with each other, the communication interface being used for wireless communication;
  • the processor invokes the executable program code stored in the memory to perform some or all of the steps described in any of the methods of the first aspect of the embodiments of the present invention.
  • FIG. 1 is a system architecture diagram of a cloud radio access network for implementing a data communication method according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a BBU for supporting a communication method of data according to an embodiment of the present invention
  • FIG. 2.1 is a layered schematic diagram of internal protocol layer functional units of a first BBU and a second RRU according to an embodiment of the present invention
  • FIG. 2.2 is a schematic structural diagram of a protocol stack in an LTE system according to an embodiment of the present disclosure
  • FIG. 2.3 is a layered schematic diagram of internal protocol layer functional units of a second BBU and a second RRU according to an embodiment of the present invention
  • Figure 2.4 is a layered diagram of internal protocol layer functional units of a third BBU and a second RRU according to an embodiment of the present invention
  • FIG. 3 is a schematic flowchart of a data communication method according to an embodiment of the present invention.
  • FIG. 4 is a block diagram showing the functional unit configuration of a BBU according to an embodiment of the present invention.
  • a multi-point coordinated transmission CoMP scheme specified in the existing wireless communication protocol standard is first introduced.
  • the CoMP technology utilizes coordinated transmission between multiple cells to solve the problem of cell edge interference, thereby improving Cell edge and system throughput, expanding high-speed transmission coverage. Since the base stations of the cells work independently, the base station cannot obtain the joint processing gain. Therefore, the cloud radio access network (C-RAN, Cloud radio acess network) architecture is adopted to implement the CoMP solution.
  • C-RAN Cloud radio acess network
  • BBUs baseband processing units of the base stations are concentrated to support large-scale joint processing, so that CoMP transmission can obtain system capacity gain, and system cost can be reduced by resource statistical multiplexing.
  • the large-scale joint processing needs to remotely transmit the data of each Radio Radio Unit (RRU) to the BBU resource pool.
  • the BBU and the RRU are interconnected by the Common Public Radio Interface (CPRI).
  • CPRI Common Public Radio Interface
  • the data transmission rate on the CPRI interface increases linearly with the number of antennas and the system bandwidth.
  • the high transmission bandwidth requirements pose a great challenge to the transmission network of the existing access layer, and are deployed to operators with insufficient fiber resources. difficult.
  • FIG. 1 is a system architecture diagram of a cloud radio access network for implementing a data communication method according to an embodiment of the present invention, including a BBU, an RRU1, an RRU2, and a user equipment UE, where the BBU and the RRU1 are provided. There is an interface between the RRUs.
  • the interface can be carried by a carrier such as optical fiber or wireless.
  • the RRU1 and the RRU2 and the UE implement data interaction by means of wireless communication.
  • the BBU and the RRU described in the embodiments of the present invention are not limited to the BBU and the RRU in the C-RAN architecture, and the BBU may also be a centralized in the radio access network as a service (RANaaS).
  • Processing network elements, etc. may also be Long Term Evolution (LTE) base stations or other wireless access technologies such as millimeter wave, universal mobile telecommunication systems (UMTS, Universal Mobile Telecommunications System) and other base stations, in the case of the universal mobile communication system UMTS, the BBU may also be an evolved base station combining a radio access network controller (RNC) and a Node B (Node B).
  • RNC radio access network controller
  • Node B Node B
  • the RRU may also be a distributed processing network element in the RANaaS architecture, and the RRU may also be a base station or an evolved base station of an LTE base station or other radio access technologies such as millimeter wave, UMTS, etc.; the BBU may provide wireless coverage or not provide Wireless coverage, for example, a BBU may not have a radio frequency (RF) system, and the RRU generally provides wireless coverage.
  • RF radio frequency
  • the radio spectrum used by the BBU and the RRU may be the same band or the same frequency, or may be different frequency bands or different frequencies; the same band may be used between the RRUs.
  • BBU and RRU can be called central processing unit CU (central unit) and wireless access point (RAP), primary base station (MeNB) The name of the master eNB) and the secondary base station (SeNB, secondary eNB), etc.
  • RAP wireless access point
  • MeNB primary base station
  • SeNB secondary base station
  • the present invention uses the names of the prior art BBUs and RRUs, but its meaning has been generalized and evolved.
  • FIG. 2 is a schematic structural diagram of a BBU for supporting a data communication method according to an embodiment of the present invention.
  • the BBU includes at least one processor 101, a communication bus 102, a memory 103, and at least one communication interface 104.
  • the processor 101 can be a central processing unit CPU, or a microprocessor, or an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the technical solution.
  • Communication bus 102 can include a path for communicating information between the components described above.
  • the memory 103 can be a read-only memory (ROM), or other type of static storage device that can store static information and instructions, or a random access memory (RAM), or can store information and instructions.
  • ROM read-only memory
  • RAM random access memory
  • the communication interface 104 can be used for transmitting and receiving information or receiving and transmitting signals during the interaction with the RRU. Specifically, after receiving the uplink data of the RRU, the processor 101 processes the data. In addition, the downlink data is designed to be sent to the RRU.
  • EEPROM Electrically Erasable Programmable Read-Only Memory
  • CD-ROM Compact Disc Read-Only Memory
  • optical storage including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.
  • magnetic storage media or other magnetic storage devices or capable of carrying or storing desired program code in the form of instructions or data structures and Any other media that can be accessed by a computer Quality, but not limited to this.
  • the communication interface 104 can be used for transmitting and receiving information or receiving and transmitting signals during the interaction with the RRU. Specifically, after receiving the uplink data of the RRU, the processor 101 processes the data. In addition, the downlink data is designed to be sent to the RRU.
  • communication interface 104 may include, but is not limited to, a CPRI interface, an antenna, at least one amplifier, a transceiver, a coupler, an LNA (Low Noise Amplifier), a duplexer, and the like.
  • communication interface 104 can also communicate with the network and other devices via wireless communication.
  • the wireless communication may use any communication standard or protocol, including but not limited to GSM (Global System of Mobile communication), GPRS (General Packet Radio Service), CDMA (Code Division Multiple Access). , Code Division Multiple Access), WCDMA (Wideband Code Division Multiple Access), LTE (Long Term Evolution), e-mail, SMS (Short Messaging Service), and the like.
  • the mobile terminal may further include an output device 105 and an input device 106.
  • the output device 105 is in communication with the processor 101 and can display information in a variety of ways.
  • the input device 106 is in communication with the processor 101 and can accept user input in a variety of ways.
  • the memory 103 pre-stores executable program code, the memory 103 further stores a kernel module, the core module includes an operating system (e.g., WINDOWS TM, ANDROID TM, IOS TM, etc.).
  • the processor 101 in the above mobile terminal can couple the at least one memory 103, and can call the executable program code in the at least one processor 103 to execute the call processing method shown in FIG. 3 disclosed in the embodiment of the present invention.
  • the call processing method provided by the embodiment of the present invention is discussed in detail below.
  • the processor 101 of the BBU implements uplink data reception by using the communication interface 104 and the first radio remote unit RRU, where the BBU includes a first physics for jointly processing uplink data of the first RRU.
  • Layer functional unit
  • the implementation manner that the processor 101 implements uplink data reception by using the communication interface 104 and the first radio remote unit RRU is:
  • the uplink service data sent by the first RRU is received by the communication interface 104, and the uplink service data is processed by the first physical layer function unit as uplink baseband data.
  • the first physical layer function unit processes the uplink service data as uplink baseband data,
  • the method includes the following steps: fast inverse Fourier transform (IFFT) and removal of cyclic prefix CPin, resource inverse mapping, multi-antenna inverse mapping and quadrature amplitude demodulation, and forward error correction decoding.
  • IFFT fast inverse Fourier transform
  • CPin resource inverse mapping
  • multi-antenna inverse mapping multi-antenna inverse mapping and quadrature amplitude demodulation
  • forward error correction decoding forward error correction decoding.
  • the processor 101 of the BBU implements downlink data transmission by using the communication interface 104 and the second RRU, where the second RRU includes a second physical layer functional unit for baseband processing of downlink data.
  • the first RRU and the second RRU may be the same or different and are not limited.
  • the layered manner of the internal protocol layer function unit of the BBU and the second RRU may be various, which is not limited by the embodiment of the present invention.
  • the PHY-UL in the BBU is the first physics.
  • a layer function unit the PHY-DL in the RRU1 and the RRU2 is the second physical layer function unit, the BBU further includes a media access control MAC layer and the above functional unit, and the second RRU further includes a radio frequency processing function.
  • the unit, the MAC layer and the above functional units are used to implement protocol functions of the non-physical layer.
  • the functional unit above the MAC layer is a functional unit corresponding to a protocol layer above the MAC layer in a protocol stack architecture of a Long Term Evolution (LTE) or LTE-A (Long Term Evaluation Advanced) system.
  • LTE Long Term Evolution
  • LTE-A Long Term Evaluation Advanced
  • the schematic diagram of the structure of the protocol stack in the LTE system shown in FIG. 2.2 includes a radio resource control protocol RRC layer functional unit, a packet data convergence PDCP layer functional unit, and a radio link control RLC layer functional unit.
  • the implementation manner that the processor 101 of the BBU implements downlink data transmission by using the communication interface 104 and the second RRU is:
  • the processor 101 of the BBU performs downlink scheduling decision according to the channel state information CSI and the downlink service data of the user equipment UE by using the MAC layer function unit to generate downlink scheduling information; wherein, the interface I-1 shown in FIG. 2.1 1) indicates an interface between the MAC layer functional unit of the BBU and the second physical layer functional unit of the second RRU, and the interface I-1(2) shown in FIG. 2.1 indicates the first physical layer functional unit and the second of the BBU.
  • the interface between the RF processing function units of the RRU, the interface I-1(1) and the interface I-1(2) belong to the same interface I-1, but have different message interactions for the downlink data transmission and the uplink data reception process respectively. .
  • the CSI includes a channel quality indicator CQI, a precoding matrix indicator PMI, and a rank indicator RI, where the downlink service data includes service information sent by a user plane of the core network gateway, and the downlink scheduling information includes downlink resource allocation information and modulation.
  • Demodulation mode MCS transmission mode, antenna port allocation information, HARQ control information, etc.;
  • the processor 101 of the BBU sends the downlink scheduling information and the downlink service data to the second RRU by using the communication interface 104, where the downlink scheduling information is used to indicate that the second RRU passes the second
  • the physical layer function unit processes the downlink service data as a downlink baseband signal, and sends the downlink baseband data to the UE by using the radio frequency processing function unit.
  • the second RRU processes the downlink service data as a downlink baseband signal by using the second physical layer function unit, and specifically includes the following steps: forward error correction coding, multi-antenna mapping and quadrature amplitude modulation, resource mapping, fast Fu The inverse transform IFFT and insert the cyclic prefix Cpin.
  • the PHY-UL in the BBU is the first a physical layer functional unit
  • the PHY-DL in the RRU1 and the RRU2 is the second physical layer functional unit
  • the BBU further includes a MAC layer non-real-time processing and the above functional unit (the upper MAC in the Figure 2.3 is the MAC)
  • the second RRU further includes a MAC layer real-time processing function unit and a radio frequency processing function unit (lower MAC in FIG. 2.3 is the MAC layer real-time processing function unit, and RF is a radio frequency processing function unit).
  • the implementation manner that the processor 101 of the BBU implements downlink data transmission by using the communication interface 104 and the second RRU is:
  • the processor 101 of the BBU performs downlink scheduling decision according to the CSI and the downlink service data of the UE by using the MAC layer non-real-time processing function unit to generate downlink scheduling information; wherein, the interface I-2 shown in FIG. Indicates the interface between the MAC layer non-real-time processing functional unit of the BBU and the MAC layer real-time processing functional unit of the second RRU, and the interface I-2(2) indicates the first physical layer functional unit of the BBU and the MAC layer of the second RRU.
  • interface I-2(3) represents the interface between the first physical layer functional unit of the BBU and the radio processing functional unit of the second RRU, interface I-2(1), interface I- 2(2) and interface I-2(3) belong to the same interface I-2, but there are different message interactions for different data transmission and reception processes.
  • the processor 101 of the BBU sends the downlink scheduling information and the downlink service data to the second RRU by using the communication interface 104, where the downlink scheduling information is used to indicate that the second RRU passes the MAC layer.
  • the real-time processing function unit determines downlink resource allocation information at each transmission time interval TTI, and processes the downlink service data as downlink baseband data according to the downlink resource allocation information, and sends the downlink baseband data to the UE by using the radio frequency processing function unit. Downlink baseband data.
  • the PHY-1 in the BBU is the first a physical layer functional unit
  • the PHY-2 in the RRU1 and the RRU2 is the second physical layer functional unit
  • the first physical layer functional unit of the BBU is further configured to implement the first baseband processing of the downlink data
  • the second physical layer function unit of the second RRU is configured to implement second baseband processing of the downlink data
  • the baseband processing of the downlink data includes the first baseband processing and the second baseband processing.
  • the BBU further includes a media access control MAC layer and above functional units (the MAC in FIG. 2.4 is the MAC layer functional unit), and the second RRU further includes a radio frequency processing functional unit (RF in FIG. 2.4 is The radio frequency processing functional unit).
  • the implementation manner that the processor 101 of the BBU implements downlink data transmission by using the communication interface 104 and the second RRU is:
  • the processor 101 of the BBU performs downlink scheduling decision according to the CSI and the downlink service data of the UE, generates downlink scheduling information, and processes the downlink scheduling information and the information by using the first physical layer function unit by using the MAC layer function unit.
  • the downlink service data is the first downlink baseband data;
  • the processor 101 of the BBU sends the first downlink baseband data to the second RRU through the communication interface 104, and processes the first downlink baseband data by using the second physical layer function unit. Two downlink baseband data, and the second downlink baseband data is sent to the UE by using the radio frequency processing function unit.
  • the BBU and the second RRU do not need to transmit the high transmission traffic generated by the physical layer function unit to process the downlink data.
  • the downlink baseband data is beneficial to reduce the transmission bandwidth requirement between the BBU and the second RRU, and at the same time, the BBU and the first RRU are in the process of implementing uplink data reception.
  • the BBU can receive and jointly process the uplink service data sent by the first RRU, which is beneficial to reducing interference between different RRUs, improving system spectrum efficiency, and improving system capacity gain.
  • the processor 101 of the BBU before the processor 101 of the BBU performs the downlink scheduling decision according to the CSI and the downlink service data of the UE, the processor 101 is further configured to:
  • the original CSI is processed by the first physical layer functional unit baseband as the CSI.
  • the processing of the BBU is performed.
  • the processor 101 is further configured to:
  • the base station measures the sounding reference signal (SRS) sent by the UE, and receives the CQI information sent by the UE.
  • SRS sounding reference signal
  • the base station measures the SRS sent by the UE, and accepts the power reported by the UE.
  • PHR power headroom report
  • the uplink service data includes uplink resource allocation information, control information, modulation and demodulation mode MCS, transmission mode, antenna port allocation information, HARQ control information, and the like;
  • Baseband data and transmitting, by the radio frequency processing function unit of the first RRU, the uplink scheduling baseband data to the UE, and after receiving the uplink service data sent by the UE in response to the uplink scheduling baseband data, by using the The radio frequency processing function unit forwards the uplink service data to the BBU;
  • the uplink service scheduling information is used to generate the uplink scheduling information, and the uplink scheduling information is processed by the first physical layer function unit as uplink scheduling baseband data;
  • the uplink scheduling baseband data is used to indicate that the first RRU processes the uplink scheduling baseband data by using a physical layer function unit of the first RRU.
  • Scheduling baseband data for the second uplink and transmitting, by the radio processing function unit of the first RRU, the second uplink scheduling baseband data to the UE, and receiving the uplink sent by the UE in response to the second uplink scheduling baseband data.
  • the uplink service data is forwarded to the BBU by using the radio frequency processing function unit.
  • the BBU further includes a MAC layer non-real-time processing and the foregoing functional unit, where the first RRU includes a MAC layer real-time processing function unit and a radio frequency processing function unit, where the BBU is Before the processor 101 receives the uplink service data sent by the first RRU through the communication interface 104, the processor 101 is further configured to:
  • the uplink grant UL grant information of the TTI and sends the UL grant information to the UE through the air interface, and sends the UL grant information to the BBU, after receiving the UL grant information, the BBU according to the UL grant information Receive physical layer uplink shared channel PUSCH data.
  • FIG. 3 is a schematic flowchart of a data communication method disclosed in an embodiment of a method according to the present invention. It should be noted that although the method embodiment can be implemented according to the BBU shown in FIG. 2, the above example BBU does not constitute the only limitation of the data communication method disclosed in the method embodiment of the present invention. As shown in FIG. 3, the data communication method includes the following steps:
  • the baseband processing unit BBU and the first radio remote unit RRU implement uplink data reception, where the BBU includes a first physical layer functional unit for jointly processing uplink data of the first RRU;
  • the implementation manner of the uplink data receiving by the BBU and the first radio remote unit RRU is:
  • the first physical layer function unit processes the uplink service data as uplink baseband data, and includes the following steps: fast inverse Fourier transform (IFFT) and removal of cyclic prefix CPin, resource inverse mapping, multi-antenna inverse mapping, and quadrature amplitude. Demodulation, forward error correction decoding.
  • IFFT fast inverse Fourier transform
  • CPin resource inverse mapping
  • multi-antenna inverse mapping multi-antenna inverse mapping
  • quadrature amplitude quadrature amplitude
  • Demodulation forward error correction decoding.
  • the BBU and the second RRU implement downlink data transmission, where the second RRU includes a second physical layer functional unit for baseband processing of downlink data.
  • the layered manner of the internal protocol layer function unit of the BBU and the second RRU may be various, which is not limited by the embodiment of the present invention.
  • the BBU further includes a media access control MAC layer and the above functional unit, where the second RRU further includes a radio frequency processing function unit, where the MAC layer and the foregoing functional unit are used to implement a non-physical layer protocol.
  • the functional unit above the MAC layer is a functional unit corresponding to a protocol layer above the MAC layer in the protocol stack architecture of the LTE or LTE-A system, including a radio resource control protocol RRC layer functional unit, and a packet data convergence PDCP layer functional unit.
  • the radio link controls the RLC layer functional unit.
  • the implementation manner of implementing downlink data transmission by the BBU and the second RRU is:
  • the BBU performs downlink scheduling decision according to the channel state information CSI and the downlink service data of the user equipment UE, and generates downlink scheduling information, where the CSI includes a channel quality indicator CQI, a precoding matrix indication PMI,
  • the rank indication RI the downlink service data includes service information sent by the user plane of the core network gateway, and the downlink scheduling information includes downlink resource allocation information, modulation and demodulation mode MCS, transmission mode, antenna port allocation information, HARQ control information, and the like. ;
  • the BBU sends the downlink scheduling information and the downlink service data to the second RRU, where the downlink scheduling information is used to instruct the second RRU to process the downlink service data by using the second physical layer function unit.
  • the downlink scheduling information is used to instruct the second RRU to process the downlink service data by using the second physical layer function unit.
  • Is a downlink baseband signal and sends the signal to the UE through the radio frequency processing function unit
  • the second RRU processes the downlink service data as a downlink baseband signal by using the second physical layer function unit, and specifically includes the following steps: forward error correction coding, multi-antenna mapping and quadrature amplitude modulation, resource mapping, fast Fu The inverse transform IFFT and insert the cyclic prefix Cpin.
  • the BBU further includes a MAC layer non-real-time processing and the above functional unit
  • the second RRU further includes a MAC layer real-time processing function unit and a radio frequency processing function unit.
  • the implementation manner of implementing downlink data transmission by the BBU and the second RRU is:
  • the BBU performs downlink scheduling decision according to the CSI and the downlink service data of the UE by using the MAC layer non-real-time processing function unit to generate downlink scheduling information.
  • the BBU sends the downlink scheduling information and the downlink service data to the second RRU, where the downlink scheduling information is used to indicate that the second RRU is determined by the MAC layer real-time processing function unit at each transmission time.
  • the downlink resource allocation information of the TTI is separated, and the downlink service data is processed as downlink baseband data according to the downlink resource allocation information, and the downlink baseband data is sent to the UE by using the radio frequency processing function unit.
  • the first physical layer function unit of the BBU is further configured to implement the first baseband processing of the downlink data; correspondingly, the second physical layer functional unit of the second RRU is used to implement Second baseband processing of the downlink data;
  • the baseband processing of the downlink data includes the first baseband processing and the second baseband processing.
  • the BBU further includes a media access control MAC layer and the above functional units
  • the second RRU further includes a radio frequency processing function unit, where the MAC layer and the above functional units are used to implement a non-physical layer protocol function.
  • the implementation manner of implementing downlink data transmission by the BBU and the second RRU is:
  • the BBU performs downlink scheduling decision according to the CSI and the downlink service data of the UE, generates downlink scheduling information, and processes the downlink scheduling information and the downlink service data by using the first physical layer function unit by using the MAC layer function unit. Is the first downlink baseband data;
  • the processing function unit sends the second downlink baseband data to the UE.
  • the BBU and the second RRU are implemented.
  • the downlink baseband data of the high transmission traffic generated by the downlink data is not required to be transmitted between the BBU and the second RRU, which is beneficial to reducing the transmission bandwidth requirement between the BBU and the second RRU.
  • the BBU and the first RRU can receive and jointly process the uplink service data sent by the first RRU, which is beneficial to reducing interference between different RRUs, improving system spectrum efficiency, and improving system capacity gain.
  • the BBU before the BBU performs the downlink scheduling decision according to the CSI and the downlink service data of the UE, the BBU performs the following operations:
  • the original CSI is processed by the first physical layer functional unit baseband as the CSI.
  • the BBU when the BBU further includes a media access control MAC layer and the above functional unit, where the first RRU includes a physical layer function unit and a radio frequency processing function unit, the BBU receives the Before the uplink service data sent by an RRU, the BBU performs the following operations:
  • the base station measures the sounding reference signal (SRS) sent by the UE, and receives the CQI information sent by the UE.
  • SRS sounding reference signal
  • the base station measures the SRS sent by the UE, and accepts the power reported by the UE.
  • PHR power headroom report
  • the uplink service data includes uplink resource allocation information, control information, modulation and demodulation mode MCS, transmission mode, antenna port allocation information, HARQ control information, and the like;
  • the radio processing function unit of the first RRU sends the uplink scheduling baseband data to the UE, and after receiving the uplink service data sent by the UE in response to the uplink scheduling baseband data, the radio processing function unit is used to The BBU forwards the uplink service data;
  • the uplink scheduling baseband data is used to indicate that the first RRU processes the uplink scheduling baseband data by using a physical layer function unit of the first RRU as a second uplink scheduling baseband Data
  • the radio processing function unit forwards the uplink service data to the BBU.
  • the BBU further includes a MAC layer non-real-time processing and the foregoing functional unit, where the first RRU includes a MAC layer real-time processing function unit and a radio frequency processing function unit, where the BBU is Before receiving the uplink service data sent by the first RRU, the BBU performs the following operations:
  • the uplink scheduling information is used to indicate that the first RRU determines, by using a MAC layer real-time processing function unit of the first RRU, an uplink grant UL grant at each transmission time interval TTI.
  • FIG. 4 is a block diagram showing the functional units of a BBU disclosed in the embodiment of the device of the present invention.
  • the BBU includes an uplink data receiving unit 401 and a downlink data sending unit 402, where:
  • the uplink data receiving unit 401 is configured to implement uplink data reception with the first radio remote unit RRU, where the BBU includes a first physical layer functional unit for jointly processing uplink data of the first RRU;
  • the uplink data receiving unit 401 is configured to:
  • the downlink data sending unit 402 is configured to implement downlink data transmission with a second RRU, where the second RRU includes a second physical layer functional unit for baseband processing of downlink data.
  • the BBU further includes a media access control MAC layer and the foregoing functional unit, where the second RRU further includes a radio frequency processing function unit, where the MAC layer and the foregoing functional unit are used to implement a non-physical layer protocol function. .
  • the downlink data sending unit includes a first scheduling decision unit and a first data sending unit:
  • the first scheduling decision unit is configured to perform downlink scheduling decision according to the channel state information CSI and the downlink service data of the user equipment UE, and generate downlink scheduling information;
  • the first data sending unit is configured to send the downlink scheduling information and the downlink service data generated by the first scheduling decision unit to a second RRU, where the downlink scheduling information is used to indicate the second RRU processing
  • the downlink service data is a downlink baseband signal, and the downlink baseband data is sent to the UE.
  • the BBU further includes a MAC layer non-real-time processing and the foregoing functional unit, where the second RRU further includes a MAC layer real-time processing function unit and a radio frequency processing function unit.
  • the downlink data sending unit includes a second scheduling decision unit and a second data sending unit:
  • the second scheduling decision unit is configured to perform downlink scheduling decision according to the CSI and the downlink service data of the UE, to generate downlink scheduling information;
  • the second data sending unit is configured to send the downlink scheduling information and the downlink service data generated by the second scheduling decision unit to the second RRU, where the downlink scheduling information is used to indicate the second RRU determination Downlink resource allocation information in each transmission time interval TTI, and processing the downlink service data as downlink baseband data according to the downlink resource allocation information, and transmitting the downlink baseband data to the UE.
  • the first physical layer functional unit of the BBU is further configured to implement the downlink data.
  • First baseband processing correspondingly, the second physical layer functional unit of the second RRU is configured to implement second baseband processing of the downlink data;
  • the baseband processing of the downlink data includes the first baseband processing and the second baseband processing.
  • the downlink data sending unit includes a third scheduling decision unit and a third data sending unit:
  • the third scheduling decision unit is configured to perform downlink scheduling decision according to the CSI and the downlink service data of the UE, generate downlink scheduling information, and process the downlink scheduling information and the downlink service data as the first downlink baseband data;
  • the third data sending unit is configured to send the first downlink baseband data generated by the third scheduling decision unit to the second RRU, and process the first downlink baseband data by using the second physical layer function unit And being the second downlink baseband data, and sending the second downlink baseband data to the UE.
  • the BBU described in the device embodiment of the present invention is presented in the form of a functional unit.
  • the term "unit” as used herein shall be understood to mean the broadest possible meaning, and the object for implementing the functions described for each "unit” may be, for example, an integrated circuit ASIC, a single circuit, for executing one or more software or firmware.
  • the form of the hardware carrier of the BBU may specifically be the BBU shown in FIG. 2.
  • the function of the uplink data receiving unit 401 may be implemented by the processor 101 and the communication interface 104 in the BBU. Specifically, the processor 101 indicates that the communication interface 104 and the first remote radio unit RRU are implemented. Uplink data reception;
  • the function of the downlink data sending unit 402 may be implemented by the processor 101 and the communication interface 104 in the BBU. Specifically, the processor 101 controls the communication interface 104 to implement downlink data transmission with the second RRU.
  • the uplink data receiving unit of the BBU provided by the embodiment of the present invention and the first radio remote unit RRU implement uplink data reception
  • the downlink data sending unit of the BBU and the second RRU implement downlink data transmission
  • the BBU includes a first physical layer functional unit of joint processing of uplink data of the first RRU
  • the second RRU including a second physical layer function for baseband processing of downlink data
  • the BBU and the second RRU do not need to transmit the downlink baseband data of the high transmission traffic generated by the physical layer function unit to process the downlink data, which is beneficial to reducing the BBU and the BRU.
  • the transmission bandwidth requirement between the second RRUs, and the BBU and the first RRU can receive and jointly process the uplink service data sent by the first RRU, which is beneficial to reducing interference between different RRUs. Improve system spectral efficiency and increase system capacity gain.
  • the embodiment of the present invention further provides a computer storage medium, wherein the computer storage medium can store a program, and the program includes some or all of the steps of any one of the data communication methods described in the foregoing method embodiments.
  • the disclosed apparatus may be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or may be Integrate into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical or otherwise.
  • 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.
  • each functional unit in each embodiment of the present invention 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 memory. Based on such understanding, the technical solution of the present invention may contribute 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 memory. A number of instructions are included to cause a computer device (which may be a personal computer, server or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing memory includes: a U disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk, and the like, which can store program codes.
  • ROM Read-Only Memory
  • RAM Random Access Memory

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  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention porte, dans des modes de réalisation, sur un procédé et sur un dispositif de communication de données, comprenant : une unité de bande de base (BBU pour BaseBand Unit) recevant des données de liaison montante en provenance d'une première unité radio distante (RRU pour Remote Radio Unit), ladite unité BBU comprenant une première unité de fonction de couche physique utilisée pour traiter conjointement les données de liaison montante de ladite première unité RRU ; l'unité BBU envoyant des données de liaison descendante à une seconde unité RRU, ladite seconde unité RRU comprenant une seconde unité de fonction de couche physique utilisée pour le traitement de bande de base des données de liaison descendante. La mise en œuvre des modes de réalisation de la présente invention est avantageuse pour réduire les exigences de largeur de bande de transmission entre une unité BBU et une première unité RRU ; elle est également avantageuse pour réduire des interférences entre différentes unités RRU, ce qui permet d'améliorer l'efficacité spectrale du système et le gain de capacité du système.
PCT/CN2016/078841 2016-04-08 2016-04-08 Procédé et dispositif de communication de données WO2017173659A1 (fr)

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