WO2007003119A1

WO2007003119A1 - A baseband device of code devision multiple access mobile communication system

Info

Publication number: WO2007003119A1
Application number: PCT/CN2006/001502
Authority: WO
Inventors: Wangjun Wu; Hua Cai; Shenghong Xu; Haiqing Liu
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2005-06-30
Filing date: 2006-06-29
Publication date: 2007-01-11
Also published as: CN100474959C; CN1889723A

Abstract

A baseband device of code devision multiple access mobile communication system, it adapts modularization combination design method, integrates each function unit and process resource into each single board, and unify carries them by physical framework, the number of uplink and downlink process single board can be configured flexibly on the framework, so that satisfies the requirement of upgrade and spread of system process ability. The framework adapts symmetry design, conprises of two separate sections, can service as redundant backup each other; yet the framework adapts asymmetry design for the uplink and downlink services, and realizes them by single board having different number and different process ability, and realizes every single board by adapting modularization. So that the invention make the CDMA baseband subsystem group network flexibly, operate reliably, spead smoothly, and satisfies the requirement of high capacity and multiple services rate.

Description

Baseband device for code division multiple access mobile communication system

TECHNICAL FIELD The present invention relates to the field of mobile communication technologies, and in particular, to a baseband device of a code division multiple access mobile communication system. Background technique

With the rapid development of the Internet and the increasing demand for various wireless services, wireless communication networks that mainly carry a single voice service have become less and less suitable for people's needs. The third generation (3G, 3rd Generation) mobile communication system with high capacity, high data rate and carrying multimedia services has become the development direction of wireless communication. Code Division Multiple Access (CDMA) technology has become the most important multiple access technology in third-generation mobile communications due to its good noise immunity, confidentiality and low power.

Compared with traditional CDMA systems, the third generation of mobile communication is characterized by its ability to support multiple rate services, from voice to packet data to multimedia services, and to provide the necessary bandwidth according to specific business needs. The 3GPP (3rd Generation Partnership Project) protocol stipulates that the service types supported by the Wide Code Division Multiple Access (WCDMA) system include: 5.15Kbps 12.2Kbps voice data, 64Kbps circuit data, 144Kbps packet Data and 384Kbps packet data. For the baseband processing of different rate services, the required storage capacity, computation amount and processing delay vary greatly. Therefore, the hardware structure and implementation scheme are the key to solving the efficiency and capacity of the WCDMA system.

An important feature of 3G mobile communication systems is broadband, large capacity, support for various flexible circuit domains and packet domain services. Figure 1 shows a functional block diagram of a CDMA base station apparatus and its surrounding systems. The base station system communicates with the user equipment (UE, User Equipment) through the radio access network, and the interface is called a Uu interface; and upward receives the control signaling and service data of the radio network controller (RC); In addition, the base station system can be further divided into an antenna feed subsystem, a radio frequency subsystem, a baseband subsystem, a transmission subsystem, a control subsystem, and an operation and maintenance subsystem according to the signal flow direction, wherein the radio frequency subsystem completes the frequency band signal processing, The baseband subsystem completes the baseband signal processing, and the transmission subsystem implements the upper layer of the service to the underlying interface. It can be seen that the base station apparatus mainly implements the physical layer functions of the CDMA system, and mainly includes downlink channel coding and modulation, uplink channel despreading, demodulation and decoding, and radio frequency transmission and reception processing. The capacity and service specifications supported by the CDMA baseband baseband device largely determine the CDMA system capacity and service specifications. In order to meet the needs of business capacity growth, it is necessary to seek a corresponding base station device solution.

At the same time, from the current evolution of mobile communication services, the high construction cost of 3G mobile communication networks is an important factor hindering the evolution. Therefore, operators are demanding the manufacturing costs of 3G equipment. The requirements for the baseband device design of the CDMA base station are: low design cost, large capacity support, and support for various flexible circuit domains and packet domain services. A low-cost, high-reliability, large-capacity flexible CDMA baseband baseband device is urgently needed.

At present, the baseband subsystem implementation scheme of the existing CDMA base station integrates each processing function module on a single board, such as a sector control unit, a spread spectrum receiving unit, a channel decoding unit, a baseband transmitting unit, and It is composed of a backplane bus and so on. Although such a baseband subsystem can implement the base station baseband processing function according to certain requirements, there are many disadvantages and infeasibility.

First of all, the processing resource adjustment is not flexible enough. Once the board is designed, it cannot adjust its processing resources according to actual needs, resulting in waste or lack of resources, and it is unable to achieve high resource utilization and business processing efficiency.

Secondly, the system reliability is not high enough. Since the entire baseband subsystem is implemented on a single board, any one of the modules has a problem that causes the entire system to malfunction.

In addition, the construction cost of the network is relatively high. As mentioned above, the construction of the 3G network requires a low-cost start. The prior art solution does not provide a solution for smooth network expansion. The future growth of business capacity will increase the construction cost. Summary of the invention

It is an object of the present invention to provide a baseband apparatus for a code division multiple access mobile communication system, which enables the CDMA baseband subsystem to be flexibly set up, reliably operated, and smoothly expanded to meet the requirements of a large capacity and multiple service rates.

A baseband apparatus for a code division multiple access mobile communication system according to the present invention includes: at least one downlink processing board for implementing downlink channel coding, modulation, and power control; At least one upstream processing board for performing uplink channel search and demodulation and decoding; at least one main control board for monitoring and controlling the cooperation of the boards in the baseband device;

The uplink processing board and the downlink processing board perform uplink and downlink signal processing under the control of the main control board, and the uplink processing board performs corresponding processing on the uplink baseband signal from the radio frequency subsystem to obtain required information;

The downlink processing board processes the received signal, processes it, and sends it to the radio frequency subsystem.

The baseband device further includes:

An interface processing board, configured to implement an interface between the baseband subsystem and the radio frequency subsystem; and the baseband signal received from the radio frequency subsystem is sent to the uplink processing board for processing by the interface processing board, and processed by the downlink baseband processing board. The baseband signal is sent to the RF subsystem.

The baseband device further includes:

The relay processing board is configured to implement data exchange between the radio network controller and the base station, and the downlink processing board processes the signal received by the relay processing board, and then sends the signal to the radio frequency subsystem through the interface processing board.

The interface processing board is connected to the radio frequency transceiver module and the downlink processing board, and the uplink baseband signal received from the radio frequency subsystem is sent to the downlink processing board by the interface processing board, and then the downlink processing board forwards the signal to the uplink processing board for processing. .

The number of the downlink processing board and the uplink processing board main control board is dynamically configured according to the service capacity. Preferably, the baseband device includes at least two of the downlink processing board, the uplink processing board, and the main control board, wherein at least one of the downlink processing board, the uplink processing board, and the main control board is used as the main board, and the other is A spare board that serves as a redundant hot backup of the primary board.

Preferably, the functional boards constituting the baseband device are disposed in a physical frame, and the physical frame includes at least two independent sub-frames, each sub-frame independently implementing the functions of the baseband device, the two sub-frames Mutual backup.

Preferably, the number of blocks of the uplink processing board is greater than the number of blocks of the downlink processing board; and the processing capability of the downlink processing board is stronger than that of the uplink processing board.

The uplink processing board receives an uplink baseband signal, and respectively performs uplink dedicated channel and uplink connection Performing a search and demodulation decoding process on the input channel, and sending the processed data to the relay processing board;

The uplink processing board generates power control data, capture indication data, and sends the data to the downlink processing board;

The uplink processing board reports status information to the main control board.

The uplink processing board includes:

An uplink processing board control module, configured to implement cell configuration, uplink channel resource management, uplink control plane processing and transmission, and maintenance management of the uplink processing board;

a demodulation/access module for implementing dedicated channel demodulation and reverse access channel demodulation; and a decoding module for implementing channel decoding processing;

The uplink processing board interface module is used to implement uplink data and power control data conversion and transmission and reception.

The downlink processing board forwards the uplink baseband signal received by the interface processing board to the uplink processing board;

The downlink processing board performs downlink channel processing on the data received from the relay processing board, and then sends the data to the interface processing board;

The downlink processing board reports status information to the main control board.

The downlink processing board includes:

a downlink processing board control module, configured to implement cell configuration management, control plane processing, and data statistics, and maintenance management of the downlink processing board;

a coded modulation module, configured to implement coding and modulation of downlink data;

The downlink processing board interface module is configured to implement conversion, transmission and reception of uplink data, downlink data, and power control data.

The working mode of the downlink processing board includes an independent working mode, a primary backup working mode, and a load sharing mode.

In the independent working mode, each downlink processing board independently processes a part of the cell channel; in the primary backup working mode, some downlink processing boards process all cell channels, and the remaining downlink processing boards serve as redundant backups;

In the load sharing mode, all of the downlink processing boards jointly process all cell channels. The interface processing board distributes the received downlink baseband signals according to the primary diversity, and distributes them to each radio frequency transceiver board of the radio frequency subsystem;

The interface processing board forwards the received uplink baseband signal to the downlink processing board; the interface processing board reports status information to the main control board.

The interface processing board includes:

An interface processing board control module, configured to control information interaction with the radio frequency transceiver board, and maintain management of the interface processing board;

Multi-carrier joint clipping module, which is used for implementing downlink multi-carrier primary diversity joint clipping function and data forwarding function verification;

The interface processing board interface module is configured to implement a transmission interface function and a clipping bypass function between the radio transceiver board and the downlink processing board.

The main difference between the technical solution of the present invention and the prior art is that a modular combination design method is adopted, and each functional unit and processing resources are respectively integrated on each board, and are uniformly carried by the physical frame, and the uplink and downlink processing boards are processed. The number can be arbitrarily added to the framework to meet the system processing capacity upgrade and expansion requirements;

The frame is symmetrical and consists of two separate boxes that can be expanded for capacity or as redundant backups.

The asymmetric design of the uplink and downlink services is also adopted, which are implemented by boards of different numbers and different processing capabilities;

A modular implementation is also used for each board.

The difference in this technical solution brings about a more obvious beneficial effect, that is, the modular design realizes a flexible construction scheme, and the initial user can adopt the minimum configuration to reduce the initial network construction cost, and then add according to the network expansion needs. The corresponding module can be smoothly expanded, which greatly reduces the initial construction cost of the system and improves the feasibility;

The asymmetric design of the uplink and downlink services makes the allocation of service processing resources more reasonable, improves system processing efficiency, and meets the requirements of large-capacity multi-service rates;

The modular implementation of each board reduces implementation complexity and increases design efficiency. DRAWINGS

1 is a schematic structural diagram of a system of a CDMA base station; 2(a) and 2(b) are schematic structural views of a baseband and a radio frequency frame according to a second embodiment of the present invention;

3 is a schematic diagram showing the configuration of an upstream processing board according to a fourth embodiment of the present invention; FIG. 4 is a schematic diagram showing the configuration of a downstream processing board according to a fifth embodiment of the present invention; and FIG. 5 is a sixth embodiment of the present invention. Schematic diagram of the interface processing board.

detailed description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings.

The invention adopts a modular design, and integrates each functional unit and processing resources on each board and is uniformly carried by the physical frame. The number of uplink and downlink processing boards can be flexibly configured to meet system processing capacity upgrade and capacity expansion. demand. This not only improves system flexibility, but also provides a solution for smooth system expansion.

In order to improve the reliability of the CDMA base station system, it is also necessary to provide a fault protection solution. Based on the modular design, the present invention provides a corresponding design structure of the physical framework to realize capacity multiplication or redundancy backup.

Taking into account the asymmetry of the downlink service capacity and demand on the CDMA wireless network, the uplink and downlink asymmetry design is adopted. For the uplink service processing, multiple boards are used, and the number of channels processed by each board is small. The business is the opposite. This makes the system more efficient in processing resource allocation.

For several boards that implement key functions, the present invention also provides a modular implementation.

P strives to achieve complexity and improve design efficiency.

Example 1

In this embodiment, the baseband device of the CDMA system is a modular structure, including: The baseband signal processing board is divided into a downlink processing board (DLP) and an uplink processing board (ULP), and a downlink processing board (NDLP), which is used to implement a downlink channel. Coded modulation and power control; Uplink Processing Board (NULP) for upstream channel search and demodulation and decoding; Interface Processing Board (NIFP) for implementing between the baseband subsystem and the RF subsystem on the uplink and downlink channels The main control board (MPT) is used for coordinated control and monitoring of the boards in the baseband device to work together.

In addition, in order to achieve complete baseband processing, it is also needed to implement system monitoring. The function monitoring board (NMON) is used to support the relay processing board (NDTI) of the E1/T1 link interface processing on the Iub interface, and is used to support the STM1 optical interface of the Iub Asynchronous Transfer Mode (ATM). Optical Interface Board (NAOI).

The main functions of the baseband subsystem include the physical layer processing of downlink transmission, uplink reception, and the closed-loop processing of the physical layer. The above functional modules work together to implement these functions. NDLP and NULP implement uplink and downlink channel processing under NMPT control; interface processing board The RF subsystem is connected to the baseband subsystem. On the RF subsystem side, it is connected to the RF Transceiver Module (NTRX). On the baseband subsystem side, it is connected to the NDLP, and for the uplink baseband signal, it is forwarded by the NDLP. NULP.

In the uplink direction, the interface processing board receives the uplink baseband signal from the radio frequency subsystem of the cabinet, and then sends it to the MDLP, and then forwards it to the NULP for processing by the NDLP, completes the demodulation and decoding process, and processes the data into frames. The protocol (FP, Framing Protocol) packet form is transmitted to the radio network controller RNC through the relay processing board. In the downlink direction, the NDLP receives the data packet from the relay processing board and performs channel coding, forward modulation, power control, etc., and then sends the data to the radio frequency subsystem through the interface processing board.

In physical implementation, the baseband device of the CDMA base station provides a plurality of slots by the physical frame for carrying the boards of the respective modules. Multiple slots are provided, and the physical frame also supports slot expansion. That is, users can determine the number of slots to be filled according to the trade-offs between requirements and costs, so that flexible adjustment of processing resources can be realized. Give a capacity expansion plan. In particular, NDLP, NULP, interface processing board or MPT can determine the actual number of blocks needed according to the demand and cost.

It can be seen that the modular design is adopted to realize the flexible construction scheme. The initial user can adopt the minimum configuration, that is, the baseband subsystem only needs to use: 1 DLP, 1 NULP and 1 interface processing board, plus a common main control board NMPT, 1 relay board NDTI and 1 monitoring board NMON. In order to reduce the initial network construction cost, the corresponding modules (the NDLP board and the NULP board) can be added to the capacity expansion according to the network expansion requirements. Thereby solving the initial cost problem of 3G network construction.

Example 2

This embodiment is based on the base of the first embodiment, and utilizes the plurality of expandable single boards as described above. Features, which enable multiple boards to back up each other. In the baseband device of the CDMA base station, multiple NDLPs, JLPs, interface processing boards, and NMPTs are designed, and the main board and the standby board are used. The standby board serves as the redundant hot backup of the main board, and the standby board is used when the main board fails. Work instead of it.

In addition, the slot design on the physical frame also needs reasonable consideration. In the second embodiment, the physical frame is composed of two independent sub-frames, and the processing boards in each sub-frame constitute a baseband device, which can independently implement the baseband device. The function of the slots on the two sub-frames corresponds to each other. In actual operation, one of the frames can be used as a backup sub-frame, and the corresponding function boards are configured in the two sub-frames to make the two sub-frames back up each other. For the convenience of manufacturing and maintenance, the two sub-frames are usually designed as a symmetrical structure, and the slot distribution on the two sub-frames can be designed according to the specific situation.

2(a) and 2(b) respectively show the slot arrangement of the baseband and the radio frequency frame in this embodiment. Considering that the interface processing board corresponds to the RF subsystem, it is designed on both sides of the RF frame. The baseband can be clearly divided into two sub-frames, that is, the left sub-frame from slot 1-11, the right sub-frame from slot 12-22, each sub-box contains 8 NULP, 2 NDLP, 1 NMPT, and Place DTI and NAOL NMON in slots 23-25. The left and right sub-frames of the baseband frame are each an independent baseband processing resource pool. For example, there are 8 NULPs and 2 NDLPs in a sub-frame, and the maximum support is 6 sectors. Actually only 6 NULPs are required to work, and the other 2 ULP pre- Leave it as a board backup.

The slots 1 and 20 on both sides of the RF frame are interface processing boards, and then the board of the RF subsystem is included, including the NTR and duplex low noise amplifier (NDDL) mentioned earlier. Here NTRX is used to implement downlink IF to RF signal change, amplification, gain control; uplink RF signal amplification, filtering, RF to IF conversion. NDDL is used to implement uplink and downlink RF duplex and low noise amplifiers.

It can be seen that the present invention implements a low-cost redundant backup solution through a clever frame symmetrical design, and redundancy backup can be implemented between the NDLP, the NULP, the interface processing board, and the NMPT board of the left and right sub-frames. With fault protection, improve system reliability.

Example 3

On the basis of the second embodiment, the embodiment considers the asymmetry of the service capacity processing in the uplink and downlink directions in the CDMA radio access system, and adopts an asymmetric design of the uplink and downlink services. In each baseband subsystem, the number of blocks of NULP is more than the number of blocks of NDLP. As in Embodiment 2, each sub-frame has 8 NULPs and 2 NDLPs. In order to balance the service scale, the processing capability of each NDLP is higher than that of each JLP. The core part of each processing board is composed of a key ASIC (Application Specific Integrated Circuit). Chip implementation. The uplink ASIC chip used in the invention supports 128 channels of Adaptive Multi-Rate (AMR) voice channel and downlink ASIC chip, each chip supporting 256 channels of AM voice. It can be seen that the ASIC chip included in each NDLP has higher processing power than NULP. Each NTJLP board contains one uplink ASIC and supports 128 channels of AMR voice. Each NDLP board contains three ASICs and supports 768 AMR voices.

In this way, when the base station is configured as one NULP, one NDLP, one NMPT, one NDTI, and one NMON, it can simultaneously support 128 uplink and downlink AMR voice services, which has the feasibility of gradually expanding; When the maximum configuration is 16 NULP, 4 DLP, 2 NMPT, 1 MVION, 2 NDTI or 2 NAOI, 1536 uplink and downlink AMR voice services can be supported at the same time. For sub-frames, up to 768 uplink and downlink AMR voice services are available.

It can be seen that the uplink and downlink services of the embodiment 2 are asymmetrically designed, so that the uplink services are concentrated on the NULP board, and the downlink services are concentrated on the NDLP board. It is easy to configure the number of NULP boards and ULP boards separately according to the capacity requirements. It realizes the maximum service capacity supported by the base station. In the case of backup, it can realize large-capacity 768 uplink and downlink AMR voice services, and up to 1536 uplink and downlink AMR voice services. The system capacity has been greatly improved, and the adaptability of multi-rate services has been changed.

Example 4

This embodiment gives a detailed description of the workflow and modular design of the NULP based on the first embodiment. NULP completes uplink access channel search and dedicated channel demodulation and uplink decoding. On the data plane, the processing of the uplink baseband data of the Node B (Node of Base Station) is completed, including demodulation, channel estimation, RAKE reception, soft combining, decoding, etc. of the common and dedicated channels; On the main control board signaling process, mainly the Node B Application Part (NBAP, Node B Application Part) dedicated signaling processing; Data such as access information is sent to the NDLP; the second ATM Mediation Layer (AAL2) of the service data is processed and sent to the relay processing board; the same group of NULPs connected to the NDLP support the channel resource pool mode. The working process is as follows:

Receiving the uplink baseband signal sent by the DLP, performing multipath search, synchronization, despreading, channel estimation, demodulation and decoding processing on the uplink dedicated channel and the uplink access channel, respectively, and sending the channel decoded service data to The relay processing board is sent to the RNC by the relay processing board. In addition, the fast power control data and the capture indication data generated in the NULP board are sent to the NDLP. NULP is connected to NMPT to transmit signaling information and receive system clock signals. At the same time, NULP receives control and clock signals from NMPT and reports the status to NMPT in conjunction with its control functions.

The modular design block diagram of NULP is shown in Figure 3. The NULP consists of the following modules: Control Module, Demodulation/Access Module, Decoding Module, Interface Module, and the necessary clock and power modules.

The NULP control module is configured to implement cell configuration, uplink channel resource management, uplink control plane processing and transmission, and maintenance management of the NULP. The control module completes cell configuration, uplink channel resource management, uplink FP processing, and AAL2 transmission. In addition, the control module also performs special operation and maintenance and configuration management of the board, including board reset, software loading, and status monitoring. The control module is also responsible for receiving and processing alarms from each module.

The demodulation/access module includes a plurality of dedicated channel demodulation units and a reverse access channel demodulation unit for implementing dedicated channel demodulation and reverse access channel demodulation. The decoding module performs channel decoding processing.

The interface module implements conversion and transmission of uplink data and power control data, including format conversion and forwarding of uplink data between DLP and NULP, power control data reception or format conversion.

The clock module processes the system clock from the NMPT, multiplies the system clock, and adjusts the phase to other modules in the board. The power module converts the system power to the voltage required by each chip in the board and provides it to the chip.

Example 5

Based on the embodiment 1, the working process, the working mode and the modular design scheme of the NDLP are specifically given. NDLP first completes the forwarding of multi-sector uplink baseband data to NULP, and receives and processes the traffic plane data (AAL2 cells) from the relay processing board. And the control surface data (AAL5 cell) from the main control board, NULP, and then code modulation, wherein the modulation part can perform or not perform the I/Q clipping processing of the single unit according to the software setting, and complete the signaling process such as measurement. Implement transmit diversity control and complete downlink power control. The working process is as follows:

In the uplink direction, the digital baseband signal from the radio frequency NTRX is received from the interface processing board and forwarded to the NULP; in the downlink direction, the relay processing board transmits the data from the RNC to the NDLP, and the NDLP passes the coding, digital modulation, and expansion of the downlink channel. Frequency, then 4 bar downlink data is sent to the interface processing board. NDLP simultaneously receives a clock signal and a control signal supplied MPT, and the NMPT ^{^:} Gen status.

The modular design block diagram of NDLP is shown in Figure 4. It includes the following modules: control module, code modulation module, interface module, clock module, and power module.

The NDLP control module, the control module completes the NBAP-related cell configuration management on the Iub interface, processes the wireless parameter update control frame, and performs simple statistics operations on other data frames, and directly passes through the host connection port interface (HPI, Host Port). Interface) is forwarded to the code modulation module. The control module also performs special operation and maintenance and configuration management of the board, including software loading and resetting of the board. The control module is also responsible for receiving alarms from each module and processing them.

The code modulation module is configured to implement coding and modulation of downlink data, and is divided into a coding part and a modulation part:

The coding part encodes the downlink data, and the main function is the cyclic redundancy check of the code block.

(CRC, Cyclic Redundancy Check) Add, transport block cascading and segmentation, channel coding, rate matching, first interleaving, radio frame segmentation, transport channel multiplexing, second discontinuous transmission (DTX) insertion, physics Channel segmentation, second interleaving, physical channel mapping. The encoded downlink data is sent to the modulation section for modulation and spreading.

The modulation section modulates the encoded data. The main functions include framing of the radio channel, spreading, scrambling, power control, channel combining, diversity control, and the like. The modulation section receives the coded data from the coded portion and the power control data from the NULP, and transmits the baseband modulated signal.

The interface module is used for processing data conversion or forwarding of uplink data, conversion and forwarding of downlink data format, power control, and the like. The clock module and power module function the same as ULP.

In addition, NDLP has a variety of working methods, which are divided into independent working mode, main backup working mode and load sharing mode:

In the independent working mode, each DLP independently processes 3 cell channels, and one sub-frame and two blocks process 6 cell channels;

In the primary backup mode, each NDLP processes 6 sector channels, and 2 NDLPs in one sub-frame, only 1 block performs downlink channel processing, and the other block serves as a backup board;

In the load sharing mode, each DLP processes 6 sector channels, and the 6 sectors of the two DLPs are the same, and channel processing is performed at the same time.

Example 6

Based on the embodiment 1, the working process and the modular design scheme of the interface processing board are specifically given. The interface processing board mainly completes the interface function between the RF subsystem and the baseband subsystem. The workflow is as follows:

In the downlink data flow direction, the interface processing board receives the downlink baseband data frame sent by the NDLP, and distributes the NTRX according to one sector main diversity, and distributes the frame to each NTRX; in the uplink data flow direction, the interface processing board receives the uplink sent by each NTRX. Baseband data frame. In addition, the interface processing board receives the clock signal and control signal provided by the NMPT and reports its status to the NMPT.

The functional block diagram of the interface processing board is shown in Figure 5. It consists of three units: a multi-carrier combined clipping module, a control module, an interface module, and a clock and power module.

The control module receives the configuration information and operation and maintenance commands of the NMPT on the main control board, and reports the working status of the board to implement interaction with the NTRX information.

The multi-carrier joint clipping module supports downlink multi-carrier X 1 sector primary diversity joint clipping function and data forwarding function verification.

The interface module includes a high-speed transmission interface with NTRX and a high-speed transmission interface of NDLP, which is connected to NTRX and NDLP. In addition, the clipping bypass function is supported. In this case, the downlink baseband signal is not clipped on the interface processing board, and the data is directly sent to the NTRX for processing. In the bypass state, the NDLP is simply clipped. Either multi-channel joint clipping is implemented on NTRX.

Although the invention has been illustrated by reference to certain preferred embodiments of the invention And the description, but it will be obvious to those skilled in the art that various changes may be made in form and detail without departing from the spirit and scope of the invention.

Claims

Rights request

A baseband device for a code division multiple access mobile communication system, comprising: at least one downlink processing board for implementing downlink channel coding, modulation, and power control; and at least one uplink processing board for implementing an uplink channel Searching and demodulating and decoding; at least one main control board for monitoring and controlling the cooperation of the boards in the baseband device;

The baseband device according to claim 1, further comprising: an interface processing board, configured to implement an interface between the baseband subsystem and the radio frequency subsystem; and the processing board receives the radio frequency subsystem through the interface The baseband signal is sent to the upstream processing board for processing, and the baseband signal processed by the downlink baseband processing board is sent to the radio frequency subsystem.

The baseband device according to claim 1, further comprising: a relay processing board, configured to implement data exchange between the radio network controller and the base station, where the downlink processing board is received by the relay processing board The signal is processed and then sent to the radio frequency subsystem through the interface processing board.

4. A baseband device according to claim 2, characterized in that

The baseband device according to any one of claims 1 to 4, wherein the number of the downlink processing board, the uplink processing board, and the main control board is dynamically configured according to a service capacity.

The baseband device according to claim 5, comprising at least two blocks of the downlink processing board, the uplink processing board, and the main control board, wherein the downlink processing board, the uplink processing board, and the main control At least one of the boards serves as a main board, and the other is a spare board, and the spare board serves as Redundant hot backup of the main board.

The baseband device according to claim 6, wherein each functional board constituting the baseband device is disposed in a physical frame, and the physical frame includes at least two independent sub-frames, and each sub-frame is independently implemented The function of the baseband device, the two sub-frames are backups of each other.

The baseband device according to claim 6, wherein the number of blocks of the uplink processing board is larger than the number of blocks of the downlink processing board;

The processing capability of the downlink processing board is stronger than the processing capability of the uplink processing board.

The baseband device according to any one of claims 1 to 3, wherein the uplink processing board receives an uplink baseband signal, and performs search and demodulation decoding processing on an uplink dedicated channel and an uplink access channel, respectively. And sending the processed data to the radio network controller; the uplink processing board generates power control data, and captures the indication data, and sends the data to the downlink processing board;

The baseband device according to any one of claims 1 to 3, wherein the upstream processing board comprises:

The baseband device according to any one of claims 1 to 3, wherein the downlink processing board forwards an uplink baseband signal received from the interface processing board to an uplink processing board;

The baseband device according to any one of claims 1 to 3, characterized in that The downlink processing board includes:

The baseband device according to any one of claims 1 to 3, wherein the working mode of the downlink processing board includes an independent working mode, a primary backup working mode, and a load sharing mode.

In the load sharing mode, all of the downlink processing boards jointly process all cell channels.

The baseband device according to claim 2 or 4, characterized in that

The interface processing board distributes the received downlink baseband signals according to the primary diversity, and distributes them to each radio frequency transceiver board of the radio frequency subsystem;

The baseband device according to claim 2 or 4, wherein the interface processing board comprises: