CN100417151C - Method and device for implementing circuit service support in wireless access system - Google Patents

Abstract

The present invention provides a method and a device for realizing circuit supporting services in a broadband wireless access system with low cost on the basis of a DOCSIS protocol. In the present invention, the method for processing upstream circuit services comprises the following steps: 1. receiving the upstream circuit services; 2. decomposing circuit service frames; 3. framing MAC frames of the upstream circuit services; 4. carrying out series-parallel conversion of the upstream MAC frames; 5. upstream transmitting the MAC frames by a terminal; 6. extracting circuit services from the MAC frames of the upstream circuit services; 7. mapping upstream circuit services to a specific time slot of the circuit business frames; 8. transmitting the upstream circuit services. The present invention realizes support to circuit services in a broadband wireless access system with low cost, and accordingly, the broadband wireless access system not only can provide the circuit services, but also can provide data services. Moreover, bandwidth occupied by the two kinds of services is smoothly transited within the range of the total bandwidth of the system.

Description

Method and device for implementing circuit service support in wireless access system

technical field

The present invention relates to a fixed wireless access system, more specifically, to a method and device for providing circuit services in a wireless access system.

Background technique

Wireless access is a very promising access method for network construction in the communication field. Fixed broadband wireless access is a rapidly developing technology field. The DOCSIS (Data-Over-Cable Service Interface Specifications) protocol is developed by MCNS (Multimedia Cable Network System) Alliance developed a fully coaxial or optical fiber / coaxial hybrid wired network as a physical two-way transmission platform, providing a widely used access to two-way IP (Internet Pocket) information flow between head-end equipment and users Control protocol, because the network topology applied by the DOCSIS protocol is the same as that of broadband wireless access, and other technical backgrounds are basically the same, so the DOCSIS protocol is continuously applied to broadband wireless access systems and pushed into the market. However, the main goal of the DOCSIS protocol is to support IP data services, and there is no suggestion for realizing real-time, fixed-rate circuit services. This makes DOCSIS, when the broadband wireless access system requires simultaneous data and circuit services, The agreement shows certain limitations. Even if the QoS parameters of a certain service flow are forcibly constrained, there are disadvantages of poor implementation effect and high implementation cost, which cannot be well solved in the prior art at present.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the disadvantage that the DOCSIS protocol does not support circuit services in the prior art, and propose a method and device for supporting circuit services in a broadband wireless access system at a low cost based on the DOCSIS protocol.

The purpose of the present invention is achieved by proposing a method for supporting circuit services in a wireless access system, including a processing method for uplink circuit services and a processing method for downlink circuit services. The processing method includes the following steps:

The first step is to receive the uplink serial circuit service data stream from the user side, perform serial-to-parallel conversion and generate an uplink circuit service frame;

The second step is to decompose the circuit service frame, and extract the circuit service data of the specified time slot;

In the third step, the extracted circuit service data is formed into an uplink circuit service MAC frame;

The fourth step is to serial-parallel convert the MAC frame of the uplink circuit service to form a bit stream and send it out;

The fifth step is the uplink transmission of the circuit service MAC frame by the terminal;

The sixth step is that the base station separates the uplink circuit service from the uplink service flow and performs serial-to-parallel conversion;

The seventh step is to map the circuit service data sent uplink by each terminal to the designated time slot of the circuit service frame;

The complete circuit service frame formed in the eighth step is sent to the network side after parallel-to-serial conversion;

The processing method for the downlink circuit service includes the following steps:

The first step is to receive the downlink circuit service from the network side, convert the data format, and convert the bit stream into a byte stream;

The second step is to decompose the received circuit service frame, and extract the data of the specified time slot;

The third step is to perform the mapping of the data of the specified time slot to the terminal, and store the obtained circuit service data correspondingly according to the number of the terminal;

The fourth step is to form an MPEG-like frame with the sequentially stored circuit service data and other service data or management information in an MPEG-like format;

The fifth step is the downlink sending of continuous class MPEG frames;

Step 6: The terminal analyzes the received MPEG-like stream, and extracts the circuit service data from the circuit service bearer domain;

The seventh step is to refill the circuit service data into the specified time slot of the circuit service frame to form the circuit service frame to be sent;

The eighth step is to send out the circuit service frames after parallel-to-serial conversion in sequence.

The present invention also proposes a device for supporting circuit services in a wireless access system, including a downlink base station unit, a downlink terminal unit, an uplink base station unit, and an uplink terminal unit; the downlink base station unit includes a base station downlink circuit service interface module, Base station downlink circuit service switching module, base station downlink framing and sending module, and base station control module shared by uplink and downlink; the downlink terminal unit includes terminal downlink receiving control module, terminal downlink circuit service extraction module, terminal downlink circuit service interface module and uplink and downlink A terminal control module shared by all lines; the uplink terminal unit includes a terminal uplink circuit interface module, a terminal uplink circuit service extraction module, a terminal uplink circuit service framing module and a terminal uplink sending module; the uplink base station unit includes a base station receiving branch Road module, base station uplink circuit service extraction module and base station uplink circuit service interface module.

Compared with the existing broadband wireless access system that has been put into commercial use, the method and device proposed by the present invention have more flexible and wider application space. The present invention realizes the support for the circuit service in the broadband wireless access system at a very small cost, so that the broadband wireless access system can provide both the circuit service and the data service, and the bandwidth occupied by the two services is in the system Smooth transition within the scope of the total bandwidth, which can not only meet the needs of telecom operators for mixed access of circuit services and data services during terminal access, but also conform to the direction of future telecom technology development, which not only protects the investment of operators, but also It also prolongs the market life cycle of the equipment.

Description of drawings

Fig. 1 is a schematic diagram of the data format definition of the downlink MPEG frame proposed by the present invention.

Fig. 2 is a schematic diagram of the data format definition of the uplink MAC frame proposed by the present invention.

Fig. 3 is a flowchart of a method for processing uplink services.

Fig. 4 is a flowchart of a method for processing downlink circuit services.

Fig. 5 is a schematic structural diagram of the functional modules of the base station proposed by the present invention.

FIG. 6 is a schematic structural diagram of a terminal function module proposed by the present invention.

Fig. 7 is a schematic diagram of a single sector structure of a base station according to an embodiment of the present invention.

Fig. 8 is a schematic diagram of a terminal structure according to an embodiment of the present invention.

Detailed ways

The application of the present invention in the broadband wireless access system will be further described in detail below in conjunction with the accompanying drawings.

Fig. 1 is a schematic diagram of the data format definition of the downlink MPEG frame proposed by the present invention. As shown in FIG. 1 , the data structure of the downlink MPEG frame includes an MPEG overhead field, a P pointer field, a circuit service payload field and a data service payload field. In a specific embodiment of the present invention, the MPEG overhead field includes 4-byte MPEG overhead and a pointer field, and the 1-byte P pointer field indicates whether the MPEG frame carries circuit services and the carried circuit services length (in bytes), the circuit service payload field carries circuit service data (the length is variable), and the data payload field carries data services (the length is variable).

Fig. 2 is a schematic diagram of the data format definition of the uplink MAC frame proposed by the present invention. As shown in FIG. 2 , the data structure of the uplink circuit service MAC frame includes a circuit service frame header field, a terminal number field and a circuit service payload field. The circuit service frame header is used by the base station to identify the circuit service frame from the uplink frame, the terminal number is used to distinguish the uplink circuit service of different terminals, followed by the circuit service payload with variable length.

Fig. 3 is a flowchart of a method for processing uplink services. As shown in FIG. 3 , the method for processing the uplink service includes the following steps: 1. Receive the uplink service. That is, receive the uplink serial circuit service data code stream from the user side, perform serial-to-parallel conversion, and generate an uplink circuit service frame; 2. Decomposition of the circuit service frame. That is, the circuit service frame is decomposed, and the circuit service data of the specified time slot is extracted therefrom; 3. Framing of the uplink circuit service MAC frame. Forming the extracted circuit service data into an uplink circuit service MAC frame; 4. Serial-to-parallel conversion of the uplink MAC frame. Perform serial-to-parallel conversion on the MAC frame of the uplink circuit service to form a bit stream and send it out; 5. Uplink sending of the MAC frame by the terminal. The terminal transmits the uplink circuit service MAC frame in a wireless manner; 6. Extracting the circuit service from the uplink circuit service MAC frame. The base station separates the uplink circuit service from the uplink service flow and performs serial-to-parallel conversion; 7. Maps the uplink circuit service to a specific time slot of the circuit service frame. Mapping circuit service data sent uplink by each terminal to a designated time slot of the circuit service frame; 8. Sending uplink circuit service. The formed complete circuit service frame is sent to the network side after parallel-to-serial conversion.

Fig. 4 is a flowchart of a method for processing downlink circuit services. As shown in FIG. 4 , the method for processing circuit services includes the following steps: 1. Receive downlink circuit services. Receive the downlink circuit service from the network side, convert the data format, and convert the bit stream into a byte stream; 2. Decomposition of the circuit service frame. Decompose the received circuit service frame, and extract the data of the specified time slot; 3. Mapping of the circuit service to the terminal. Carry out the mapping from the data of the specified time slot to the terminal, and store the obtained circuit service data correspondingly according to the terminal number; 4. Carry the circuit service with similar MPEG. Compile the sequentially stored circuit service data and other service data or management information into an MPEG-like frame in an MPEG-like format; 5. Downlink transmission of the MPEG-like frame. Continuous MPEG-like frames are sent downlink through wireless; 6. Extract circuit services from MPEG. The terminal analyzes the received MPEG-like stream, and extracts circuit service data from the circuit service bearer domain; 7. Maps the circuit service of the terminal to the circuit service frame of the terminal. Refilling the circuit service data into the specified time slot of the circuit service frame to form the circuit service frame for sending; 8. Sending the downlink circuit service. The circuit service frames are sent out after parallel-to-serial conversion in sequence.

Fig. 5 is a schematic structural diagram of the functional modules of the base station proposed by the present invention. As shown in Figure 5, the base station includes a downlink base station unit and an uplink base station unit, and the downlink base station unit includes a base station downlink circuit service interface module, a base station downlink circuit service switching module, a base station downlink framing and sending module and a base station control module; The above-mentioned uplink base station unit includes a base station receiving branching module, a base station uplink circuit service extraction module and a base station uplink circuit service interface module. The base station control module is a module shared by uplink and downlink. In the downlink base station unit, the read-in circuit service bit stream is sent to the downlink circuit service interface module of the base station for serial-to-parallel conversion of the bit stream to form time slot data, and then the downlink circuit service switching module of the base station rearranges the time slot data to form a downlink circuit The service frame is controlled by the base station control module with network management function and module control. The downlink framing and transmission control module of the base station uses the MPEG-like frame to carry the downlink circuit service frame, and then sends it out. In the uplink base station unit, the uplink information flow enters the base station receiving and branching module, and the base station receiving and branching module separates the uplink circuit service MAC frame from the base station, and the uplink circuit service extraction module is controlled by the base station with network management function and module control function Under the control of the module, the uplink circuit service data of the terminal is extracted from the uplink circuit service MAC frame. The uplink circuit service interface module of the base station reorders the uplink circuit service data to form an uplink service frame. After the uplink service frame is converted from parallel to serial send it out.

FIG. 6 is a schematic structural diagram of a terminal function module proposed by the present invention. As shown in FIG. 6, the terminal includes an uplink terminal unit and a downlink terminal unit. The downlink terminal unit includes a terminal downlink receiving control module, a terminal downlink circuit service extraction module, a terminal downlink circuit service interface module and a terminal control module shared by uplink and downlink. The uplink terminal unit includes a terminal uplink circuit interface module, a terminal uplink service extraction module, a terminal uplink service framing module and a terminal uplink sending module. In the downlink terminal unit, the read downlink bit stream is sent to the downlink receiving control module of the terminal, and the downlink receiving control module of the terminal performs MPEG-like frame synchronization and analyzes the MPEG-like stream, and extracts all downlink circuit service data from the MPEG-like frame The terminal circuit service extraction module extracts the downlink circuit service data of the terminal under the control of the terminal control module with network management function and module control, and the terminal downlink circuit service interface module extracts the downlink circuit service data of the terminal. The business data is sent out after format conversion. In the uplink terminal unit, the uplink bit stream is sent to the terminal uplink circuit service interface module for serial-to-parallel conversion to form uplink circuit service data. The terminal uplink service extraction module is controlled by the terminal control module with network management functions and module control functions. The specified circuit service data is extracted from the uplink circuit service data, the uplink circuit service framing module of the terminal forms the uplink circuit service MAC frame with the input uplink circuit service data, and the terminal uplink sending module sends the uplink circuit service MAC frame out.

Fig. 7 is a schematic diagram of a single sector structure of a base station according to an embodiment of the present invention. As shown in Figure 7, the single-sector structure of the base station consists of a network interface unit, a baseband intermediate frequency unit and a radio frequency unit. The service interface module, the MAC controller module and the main control module form the network interface unit, in which the service interface module realizes the conversion and sending and receiving of circuit service and data service signals; the MAC controller module realizes the air interface protocol, and completes the control and information transmission of air transmission information Format conversion, the main control module completes the monitoring of the network interface unit, baseband intermediate frequency unit and radio frequency unit. The baseband processing module and the intermediate frequency module constitute the baseband intermediate frequency unit, in which the baseband processing module completes the baseband processing of the information flow (scrambling and descrambling, R-S codec, interleaving and deinterleaving, filtering and shaping, modulation and demodulation), and the intermediate frequency module is responsible for the baseband signal and intermediate frequency Up and down conversion between signals, the radio frequency unit completes the transmission and reception of intermediate frequency signals and wireless signals.

Fig. 8 is a schematic diagram of a terminal structure according to an embodiment of the present invention. As shown in Figure 8, the terminal is composed of a network unit, a baseband intermediate frequency unit and a radio frequency unit. The service interface module, the MAC controller module and the main control module form a network unit, in which the service interface module realizes the circuit service and data service signal conversion and sending and receiving; the MAC controller module realizes the air interface protocol, and completes the control and information format of the information transmitted in the air conversion, the main control module completes the monitoring of the network unit, the baseband intermediate frequency unit and the radio frequency unit. The baseband processing module and the intermediate frequency module constitute the baseband intermediate frequency unit, in which the baseband processing module completes the baseband processing of the information flow (scrambling and descrambling, R-S codec, interleaving and deinterleaving, filtering and shaping, modulation and demodulation), and the intermediate frequency module is responsible for the baseband signal and intermediate frequency Up and down conversion between signals, the radio frequency unit completes the transmission and reception of intermediate frequency signals and wireless signals.

Claims (5)

1. method of realize supporting Circuit Service in wireless access system comprises to the processing method of upstream circuitry business with to the processing method of downstream circuitry business, it is characterized in that:

Described processing method to the upstream circuitry business comprises the steps:

The first step receives up serial circuit business datum code stream from user side, goes here and there and change the back to generate the upstream circuitry traffic frame;

Second step decomposed the Circuit Service frame, therefrom extracted the Circuit Service data of assigned timeslot;

The 3rd step formed the professional mac frame of upstream circuitry with the Circuit Service data of extracting;

The 4th step went here and there the professional mac frame of upstream circuitry and changed, and formed bit stream and sent;

The 5th step terminal is to the up transmission of Circuit Service mac frame;

The 6th step base station is isolated up Circuit Service and is gone here and there and change from up Business Stream;

The 7th step arrived the Circuit Service data map of the up transmission of each terminal the assigned timeslot of Circuit Service frame;

The complete Circuit Service frame that the 8th step formed is through also sending to network side after the string conversion;

Described processing method to the downstream circuitry business comprises the steps:

The first step receives descending Circuit Service from network side, carries out the conversion of data format, converts the code stream that byte is a unit to from bit stream;

Second step decomposed the Circuit Service frame of receiving, and therefrom took out the data of assigned timeslot;

The 3rd step was carried out the mapping of the data of assigned timeslot to terminal, deposited the Circuit Service data of getting are corresponding with it by the numbering of terminal;

The Circuit Service data that the 4th step will deposit in order and other business datum or management information are formed the class mpeg frame by the form of class MPEG;

The descending transmission of the class mpeg frame that the 5th step is continuous;

The class mpeg stream that the 6th step end-on is received is resolved, and extracts the Circuit Service data from the Circuit Service hosting domain;

The 7th goes on foot the assigned timeslot that the Circuit Service data is recharged the Circuit Service frame, forms the Circuit Service frame that sends;

The 8th step the Circuit Service frame carried out in order and go here and there change after, send.

2. a kind of method that realizes supporting Circuit Service in wireless access system as claimed in claim 1, it is characterized in that: the up transmission of described Circuit Service mac frame and the descending transmission of class mpeg frame are all undertaken by wireless mode.

3. a kind of method that realizes supporting Circuit Service in wireless access system as claimed in claim 1 is characterized in that: the data structure of the professional mac frame of described upstream circuitry comprises Circuit Service frame head territory, terminal number territory and Circuit Service payload field.

4. a kind of method that realizes supporting Circuit Service in wireless access system as claimed in claim 1, it is characterized in that: the data structure of described class mpeg frame comprises MPEG expense territory, P pointer field, Circuit Service payload field and data service payload field.

5. a device of realizing supporting Circuit Service in wireless access system comprises descending base station unit, downstream station unit, up base station unit and up terminal unit; It is characterized in that:

Described descending base station unit comprises base station down Circuit Service interface module, base station down Circuit Service Switching Module, base station down framing and sending module and the shared base stations control module of up-downgoing; Wherein said base station down Circuit Service interface module is used for the Circuit Service bit stream that reads in gone here and there and changes and forms the time slot data, described base station down Circuit Service Switching Module is used for the time slot data are rearranged formation downstream circuitry traffic frame, described base stations control module is used to control described base station down framing and sending module class mpeg frame bearing downlink Circuit Service frame, sends out then;

Described downstream station unit comprises the descending reception control module of terminal, the professional extraction module of terminal downstream circuitry, terminal downstream circuitry business interface module and the shared terminal control module of up-downgoing; The descending reception control module of described terminal is used to receive downstream bits stream, carrying out the class mpeg frame resolves synchronously and to the class mpeg stream, from the class mpeg frame, extract all descending Circuit Service data and send into the professional extraction module of described terminating circuit, the professional extraction module of described terminating circuit is under the control of described terminal control module, extract the downstream circuitry business datum of described terminal, described terminal downstream circuitry business interface module carries out the downstream circuitry business datum of this terminal to send out after the format conversion;

Described up terminal unit comprises terminal upstream circuitry interface module, the professional extraction module of terminal upstream circuitry, terminal upstream circuitry professional one-tenth frame module and the up sending module of terminal; Described terminal upstream circuitry business interface module is used to receive up bit stream, and carried out forming the upstream circuitry business datum after string and the conversion, the professional extraction module of described terminal upstream circuitry extracts the Circuit Service data of appointment from the upstream circuitry business datum under the control of described terminal control module, the professional one-tenth of described terminal upstream circuitry frame module is used for described upstream circuitry business datum is formed the professional mac frame of upstream circuitry, and the up sending module of described terminal is used for the professional mac frame of upstream circuitry is sent out;

Described up base station unit comprises that the base station receives shunt module, the professional extraction module of base station upstream circuitry and base station upstream circuitry business interface module; Described base station receives shunt module and is used to receive uplink information stream, from the base station, isolate the professional mac frame of upstream circuitry, the professional extraction module of described upstream circuitry extracts the upstream circuitry business datum of terminal from the professional mac frame of upstream circuitry under the control of described base stations control module, described base station upstream circuitry business interface module through forming the upstream circuitry traffic frame after the rearrangement arrangement, sends out the upstream circuitry business datum after upstream circuitry traffic frame warp and the string conversion.

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