WO2006072221A1 - Procede permettant a un terminal d'acceder au reseau - Google Patents

Procede permettant a un terminal d'acceder au reseau Download PDF

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Publication number
WO2006072221A1
WO2006072221A1 PCT/CN2006/000031 CN2006000031W WO2006072221A1 WO 2006072221 A1 WO2006072221 A1 WO 2006072221A1 CN 2006000031 W CN2006000031 W CN 2006000031W WO 2006072221 A1 WO2006072221 A1 WO 2006072221A1
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WO
WIPO (PCT)
Prior art keywords
bandwidth
base station
terminal
request message
initialization process
Prior art date
Application number
PCT/CN2006/000031
Other languages
English (en)
Chinese (zh)
Inventor
Jianjun Wu
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2006072221A1 publication Critical patent/WO2006072221A1/fr

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Classifications

    • 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]
    • H04W28/18—Negotiating wireless communication parameters
    • H04W28/20—Negotiating bandwidth
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/15—Flow control; Congestion control in relation to multipoint traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/78—Architectures of resource allocation
    • H04L47/788—Autonomous allocation of resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/82—Miscellaneous aspects
    • H04L47/824—Applicable to portable or mobile terminals

Definitions

  • the present invention relates to the field of broadband wireless access technologies, and more particularly to a method of accessing a terminal to a network. Background of the invention
  • the IEEE 802.16 protocol defines a wireless metropolitan area network standard for fixed broadband wireless access (BWA), which defines different physical layer technologies for different frequency bands.
  • BWA fixed broadband wireless access
  • the scope of the standard is primarily for residential, small office/home office (SOHO), teleworkers, and small business user (SME) markets.
  • the terminal accesses the network including the following initialization processing:
  • the above steps are for the terminal to re-access the network during the initial access to the network process or handover. Initialization processing that needs to be completed during non-initial access to the network.
  • the terminal needs to allocate bandwidth to the base station whether it is sending a management message or a service data packet. If there is no bandwidth available for transmission, the terminal needs to initiate a bandwidth request, and then The base station assigns it.
  • the IEEE 802.16 protocol currently describes the initial search interval that is allocated through the uplink when the terminal initially accesses or re-accesses the non-initial access network such as the network during the handover process.
  • the terminal Before initiating Ranging, the terminal first synchronizes the physical layer by searching for the synchronous downlink pilot (preamble), and receives the downlink transmission parameter (DCD)/UCD broadcast management message, and obtains the channel parameter and the current channel downlink interval usage code (DIUC) / Uplink interval code
  • DCD downlink transmission parameter
  • DIUC current channel downlink interval usage code
  • Step 101 The terminal sends an Initial Ranging CDMA Code by using a contention method in an Initial Ranging interval;
  • Step 102 After receiving the Initial Ranging CDMA Code sent by the terminal, the base station assigns a bandwidth to the terminal in an uplink mapping message (UL_MAP) of the next frame.
  • Step 103 The terminal sends the bandwidth allocated by the base station. Search request (RNGJ JEQ) message for Ranging;
  • Step 104 The base station responds by searching for a response (R G_RSP ) message. After that, both the terminal and the base station complete the Ranging initialization process through multiple RNG-KEQ messages and KNG-RSP messages: interaction. .
  • R G_RSP response
  • both the terminal and the base station complete the Ranging initialization process through multiple RNG-KEQ messages and KNG-RSP messages: interaction. .
  • the RSP 'cancellation' message in the base station to the terminal with a success (. Success) .. state, the RSP 'cancellation' message; after ⁇ 'the "Ranging initialization process is completed with the completion of the initialization process Ranging, step 102
  • the bandwidth allocated for the terminal is also released.
  • the terminal access has the above 4 > ⁇ 10).
  • the terminal When executed immediately after the deliberation Ranging, the terminal first initiates capability negotiation request message (SBC- REQ). Since the bandwidth allocated by the base station to the terminal after Ranging is released, the terminal needs to request bandwidth from the base station to complete the subsequent access procedure even if the message to be sent is a management message.
  • SBC- REQ capability negotiation request message
  • the main problem to be solved by the present invention is to provide a method for the terminal to access the network, so that the terminal can acquire the bandwidth after performing Ranging, thereby completing the subsequent initial processing in the access process.
  • the present invention provides the following technical solutions:
  • a method for accessing a terminal to a network includes the following steps:
  • the base station When the current initialization process is completed, the base station actively allocates a bandwidth for transmitting the request message in the subsequent initialization process to the terminal, and sends the bandwidth information to the terminal; bl. the terminal uses the bandwidth allocated by the base station Sending, by the base station, the request message of the subsequent initialization process;
  • the base station receives the message "Sc.. bl", and the corresponding response is cancelled.
  • the bandwidth allocated by the base station to the request message of the terminal is: the request The bandwidth required for the message to contain the largest possible domain, or the bandwidth required for the request message to be known or fixed. +
  • the base station sends the bandwidth information to the terminal: in the subsequent uplink frame, the bandwidth information is sent to the terminal by using the uplink mapping message UL_MAP.
  • the current initialization process is: an initial search; the subsequent initialization process is: capability negotiation.
  • the method further includes the following steps:
  • the base station When the current initialization process is completed, the base station actively allocates a bandwidth for transmitting the bandwidth request message in the subsequent initialization process, and sends the bandwidth information to the terminal;
  • the terminal sends a bandwidth request message of the subsequent initialization process to the base station by using the bandwidth allocated by the base station;
  • the base station After receiving the bandwidth request message described in step el, the base station allocates a bandwidth for sending the request message to the terminal, and sends the bandwidth information to the terminal;
  • the terminal sends a request message for the subsequent initialization process to the base station according to the bandwidth allocated by the base station in step fl;
  • the base station After receiving the request message in step gl, the base station returns a corresponding response message to the terminal.
  • the current initialization process is: capability negotiation, and the subsequent initialization process is: terminal authentication authentication, performing key exchange;
  • the current initial processing is: terminal authentication authentication and performing key exchange
  • the subsequent initialization processing is: performing registration
  • the current initialization process is: performing registration
  • the subsequent initialization process is: establishing an IP connection, establishing a time and date synchronization, transmitting an operation parameter, or establishing a provision ( Provisioned) connection.
  • the terminal may further include: 'the terminal determines whether to receive the bandwidth information actively allocated by the base station, and if yes, the step of sending the related information according to the bandwidth; otherwise, the terminal sends the related information to the bandwidth allocated by the base station; , and then perform the following steps:
  • the terminal sends a request for requesting bandwidth for the bandwidth request message to the base station by using a contention manner, and the base station allocates a bandwidth for the bandwidth request message to the terminal according to the request;
  • the terminal After receiving the bandwidth information allocated by the base station for the bandwidth request message, the terminal sends a bandwidth request message to the base station according to the bandwidth, and the base station allocates the bandwidth for the corresponding request message according to the bandwidth request message.
  • the terminal After receiving the bandwidth information allocated by the base station for the request message, the terminal sends a corresponding request message to the base station according to the bandwidth, and the base station returns a corresponding response message.
  • the terminal may further include: before transmitting the related information by using the bandwidth allocated by the base station for itself;
  • the terminal determines whether the bandwidth information allocated by the base station is received, and if yes, continues to perform the step of transmitting related information according to the bandwidth; otherwise, the following steps are performed:
  • the terminal After the normal data transmission is performed, the terminal sends the bandwidth request message to the base station along with the path in the normal data transmission process, and the base station allocates the bandwidth for the corresponding request message according to the bandwidth request message.
  • the terminal After receiving the bandwidth information allocated by the base station for the request message, the terminal sends a corresponding request message to the base station according to the bandwidth, and the base station returns a corresponding response message.
  • Method network a base station and a terminal first completed access network during the initial search, the method that the bandwidth is acquired when the terminal performs subsequent initialization process, comprising the steps of: A2.
  • the base station actively allocates a bandwidth of the bandwidth request message sent by the terminal for sending the request message during the initialization process, and sends the bandwidth information to the terminal;
  • the terminal sends the bandwidth request message of the subsequent initialization process to the base station by using the bandwidth allocated by the base station;
  • the base station After receiving the bandwidth request message described in step b2, the base station allocates a bandwidth for sending the request message to the terminal, and sends the bandwidth information to the terminal;
  • the terminal sends a request message of the subsequent initialization process to the base station according to the bandwidth allocated by the base station in step c2;
  • step d2 After receiving the request message in step d2, the base station returns a corresponding response message to the terminal.
  • the base station sends the bandwidth information to the terminal: 'In the subsequent uplink frame, the bandwidth information is sent to the terminal by using the UL-MAP message.
  • the bandwidth request message sent by the terminal to the base station carries the bandwidth value information of the current required bandwidth of the terminal;
  • step c2 the base station allocates bandwidth to the terminal according to the bandwidth value information carried in the bandwidth request message.
  • the current initialization process is: an initial search; the subsequent initialization process is: capability negotiation.
  • the method further includes the following steps:
  • the base station When the current base station is initialized, the base station actively allocates a bandwidth message for transmitting the request message in the subsequent initial processing process to the terminal. Issued to the terminal;
  • the terminal sends a request for subsequent initialization processing to the base station by using the bandwidth allocated by the base station. Message
  • the base station returns the corresponding response to the terminal after receiving the request message described in step g2.
  • the current initialization process is: capability negotiation, and the subsequent initialization process is: terminal authentication authentication and performing key exchange;
  • the current initialization process is: terminal authentication authentication and performing key exchange, and the subsequent initialization process is: performing registration;
  • the current initialization process is: performing registration
  • the subsequent initialization process is: establishing an IP connection, establishing time and date synchronization, transmitting operation parameters, or establishing a connection.
  • the terminal Before the terminal sends relevant information by using the bandwidth allocated by the base station to itself, the terminal may further include:
  • the terminal determines whether the bandwidth information actively allocated by the base station is received, and if yes, performs the step of transmitting related information according to the bandwidth; otherwise, the following steps are performed:
  • the terminal sends a request for requesting bandwidth for the bandwidth request message to the base station by using a contention manner, and the base station allocates a bandwidth for the bandwidth request message to the terminal according to the request;
  • the terminal After receiving the bandwidth information allocated by the base station for the bandwidth request message, the terminal sends a bandwidth request message to the base station according to the bandwidth, and the base station allocates the bandwidth for the corresponding request message according to the bandwidth request message.
  • the terminal After receiving the bandwidth information allocated by the base station for the request message, the terminal sends a corresponding odd message to the base station according to the bandwidth, and the base station returns a corresponding response message.
  • the terminal may further include 'including: ⁇ ' before using the bandwidth allocated by the base station to actively allocate the relevant information:
  • the terminal determines whether the bandwidth information allocated by the base station is received, and if yes, continues to perform the step of transmitting related information according to the bandwidth; otherwise, the following steps are performed: After the normal data transmission is implemented, the terminal sends the bandwidth request message to the base station along with the path in the normal data transmission process, and the base station allocates bandwidth for the corresponding request message according to the bandwidth request message;
  • the terminal After receiving the bandwidth information allocated by the base station for the request message, the terminal sends a corresponding request message to the base station according to the bandwidth, and the base station returns a corresponding response message.
  • the solution of the present invention actively allocates bandwidth to the terminal through the base station, so that the terminal can obtain the corresponding bandwidth to complete the initialization process after the initial search in the access process, and also solves the interoperability problem of the terminal access process existing in the current EEEE 802.16 protocol. At the same time, it also ensures that the terminal can access the network at a faster speed.
  • the solution of the present invention mainly provides two schemes for the base station to directly allocate bandwidth for the request message required for each initialization process, and allocate bandwidth for the bandwidth request message for requesting bandwidth for the request message, and also provides the two solutions.
  • the combination scheme, and other processing schemes based on the two schemes and the combination scheme that is, providing various implementation means, greatly facilitates the realization of the terminal access network.
  • FIG. 1 is a flowchart of implementing an initial search in a terminal access network
  • FIG. 3 is a timing diagram of a message flow for implementing terminal access by adopting the first scheme according to the present invention
  • FIG. 4 is a flowchart of implementing a capability negotiation by using the second scheme according to the present invention
  • FIG. 5 is a timing diagram of a message flow for implementing terminal access by using the second scheme according to the present invention
  • FIG. 6 is a timing diagram of implementing a final access message flow by using a combination scheme according to the present invention. Mode for carrying out the invention'
  • the solution of the present invention mainly provides two implementation schemes, that is, when the initial search that has been implemented is completed, and each subsequent initialization processing process is performed, the base station actively allocates the terminal for transmitting the subsequent initialization processing. Requesting the bandwidth information of the message, so that the terminal can directly send the odd request message to the base station according to the bandwidth; the other is that the base station actively allocates the terminal for sending when the initial search is completed and each subsequent initialization process is performed. After the bandwidth information of the bandwidth request message in the process of the initialization process, the terminal sends a bandwidth request message to the base station according to the bandwidth, and requests the base station to allocate a bandwidth for sending the request message.
  • initialization processes When the terminal accesses the network, such as when initially accessing the network or re-accessing the network, such as re-accessing the network, a number of initialization processes need to be performed.
  • these initialization processes include: capability negotiation, Terminal authentication and authentication, performing key exchange, performing registration, establishing IP connection, establishing time and date synchronization, transmitting operational parameters, establishing preset connections, etc., and each initialization processing is implemented in a similar manner. Therefore, the following is mainly to implement capability negotiation. For example, the two schemes are separately described.
  • Step 201 The base station actively assigns the uplink bandwidth to the terminal in the UL_MAP message of the next uplink frame according to the request message that the terminal needs to send, that is, the maximum length range of the SBCJREQ message.
  • Step 202 The terminal sends an SBC_REQ message to the base station according to the bandwidth.
  • Step 203 After receiving the SBCJREQ message, the base station may return an SBC_RSP message to the terminal in the next downlink frame, thereby implementing a negotiation.
  • the SBC_REQ message has many types of length values (TLV, Type/Length/Value), the size of these TLVs is not fixed, and the specific size of the message depends on the terminal. What is the capacity item, so when the base station assigns this bandwidth, it can follow the protocol.
  • the SBC-REQ message specified by the protocol is allocated with the bandwidth required to contain the largest possible domain, so that the allocated bandwidth must meet the transmission requirements. 'After the scheme similar to the above-mentioned implementation capability negotiation, all subsequent processing of the initialization processing can be realized. Of course, if the size of the request message to be sent in the subsequent step is fixed or known, 'the base station can allocate the bandwidth directly according to the size.
  • the terminal actively allocates the bandwidth to the terminal through the UL-MAP message in the subsequent uplink frame, so that the terminal can directly send the authentication according to the bandwidth.
  • the request message that is, the PKM_REQ message
  • the base station after receiving the PKM-REQ message, the base station returns an authentication response message, that is, a PKM-RSP message, to the terminal in the next downlink frame, thereby implementing capability negotiation.
  • the terminal After the base station sends the PKM-RSP message and implements the authentication authentication, the terminal actively allocates the bandwidth to the terminal through the UL-MAP message in the subsequent uplink frame, and the terminal directly sends the request message for registration according to the bandwidth value. (REGJ EQ), after receiving the REGJREQ, the base station returns a registration response message (REG_RSP) to the terminal in the next downlink frame, thereby realizing registration.
  • the base station After the base station sends the REG-RSP message, after the registration is implemented, the bandwidth is actively assigned by the UL_MAP message in the subsequent uplink frame, and the terminal sends the dynamic host control through the base station on the second management connection identifier (Secondary Management CID).
  • the DHCP discover message is sent to the dynamic master's control protocol server (DHCP Server).
  • DHCP Server After receiving the response from the DHCP server to the terminal, the base station sends a response message to the terminal on the Secondary Management CIQ.
  • the base station After the base station is on the subsequent uplink: frame ⁇ times over UL MAP: '. ⁇ :.
  • ⁇ ' is the terminal, the main: mobile assignment bandwidth:, let the terminal send a DHCP request message through the base station on the Secondary Management CID After the DHCP server receives the response from the DHCP server to the terminal, it is in the Secondary The management CID sends a response message, that is, a DHCP response message to the terminal. An IP connection is established through this process.
  • the base station After transmitting the DHCP response message, the base station actively allocates the bandwidth to the terminal through the UL_MAP message in the subsequent uplink frame, and the terminal sends a corresponding request message according to the bandwidth, so that the base station and the terminal complete the subsequent operation parameter transmission and / or set up time synchronization and / or establish a preset connection.
  • the transmission operation parameters can be downloaded through the Simple File Transfer Protocol (TFTP), and the establishment of the preset connection can be realized through the Provisioned service flow.
  • TFTP Simple File Transfer Protocol
  • the bandwidth size when the base station specifies the bandwidth for the terminal is the same as the implementation capability negotiation, and may also be determined according to the maximum content that the corresponding request message may carry.
  • the base station actively allocates bandwidth for the request message, so that the message flow timing of the terminal accessing the network is as shown in FIG. 3. ,
  • Step 401 The base station actively allocates, for the terminal, the bandwidth used for the bandwidth request message (BW request message) in the UL-MAP message of the next uplink frame.
  • BW request message bandwidth used for the bandwidth request message
  • Step 402 The terminal sends a BW request message message for the SBC REQ message to the base station according to the bandwidth.
  • the terminal itself can know the bandwidth required to send the SBCJ EQ message. Therefore, the bandwidth request message sent by the terminal to the base station can carry the SBCJREQ. Information. The exact bandwidth information required, the station will allocate bandwidth according to this information.
  • Step 403 After receiving the BW request message, the base station allocates a corresponding bandwidth to the terminal in the UL_MAP message of the next uplink frame.
  • Step 404 The terminal sends an SBC_REQ message to the base station according to the bandwidth allocated by the base station in step 403.
  • Step 405 After receiving the SBC_REQ message sent by the terminal, the base station returns a corresponding SBCJ SP message to the terminal.
  • the base station can allocate appropriate bandwidth information to the terminal, thereby avoiding direct allocation of the base station.
  • Bandwidth may cause a waste of bandwidth resources.
  • the base station actively allocates bandwidth for the bandwidth request message, and the base station allocates bandwidth according to the application of the terminal, so that the message flow timing of the terminal accessing the network is as shown in FIG. 5.
  • the two schemes provided by the present invention have been described above.
  • the two schemes can be used at the same time, that is, the first implementation scheme is adopted in one or several initialization processing processes, and the other initializations are performed.
  • the process uses another implementation. For example, when authentication and registration are implemented, the base station directly allocates bandwidth for the corresponding request message, and when other initialization processing is implemented, the base station first allocates a bandwidth request message: bandwidth ', the base station according to The application of the terminal allocates bandwidth for the corresponding request message.
  • the request for the corresponding initialization processing can be eliminated.
  • the scheme of allocating bandwidth by the base station for the bandwidth request message is adopted, and in the case where the required bandwidth of the request message is fixed or known, the base station directly allocates bandwidth for the request message.
  • the terminal acquires the bandwidth through the contention method.
  • the process is shown in Figure 5, which corresponds to the following steps:
  • Step 501 The terminal first sends a BW request Code to the base station;
  • Step 502 After receiving the code, the base station allocates a bandwidth to the terminal in a subsequent uplink frame, for example, assigning a bandwidth to the terminal by using a code division based bandwidth assignment message (CDMA-Allocation-IE).
  • CDMA-Allocation-IE code division based bandwidth assignment message
  • Step 503 The terminal sends a bandwidth request message for the current request message to be sent.
  • Step 504 After receiving the bandwidth request message, the base station allocates a bandwidth to the terminal in a subsequent uplink frame.
  • Step 505 The terminal sends a request message to the base station according to the bandwidth.
  • Step 506 After receiving the request message, the base station returns a corresponding response message to the terminal in the next downlink frame.
  • the request message sent by the terminal in the bandwidth in the above step 505 is an SBC-REQ message; for terminal authentication authentication and key exchange, the request message is: PKM-REQ message
  • the request message is a REG_REQ message; for establishing an IP connection, the request message is a DHCP discover message and a DHCP offer message, etc.
  • the request message is: corresponding to the FTP download ⁇
  • the message should be.
  • the present invention can also adopt a scheme in which a terminal directly initiates a competition for applying for bandwidth, but There may be conflicts in the competition, and the implementation plan initiated by the terminal will have a delay. Therefore, if the conflict occurs, it will lead to a delay of two steps. 'This will inevitably affect the access speed of the terminal.
  • some initialization processing of the terminal access network may not need to be completed immediately, that is, the initialization processing may be completed subsequently.
  • the base station may not actively allocate bandwidth for the processing, but The terminal acquires bandwidth by means of competition. For example, if the terminal needs to re-access the network because of the handover, some processing can be completed later.
  • the scheme of the present invention simultaneously uses the above two schemes, and then uses the contention method to realize the message flow timing of the terminal access as shown in FIG. 6.
  • the terminal needs to re-access the network due to handover or the like, that is, when the network is not initially accessed, some necessary processing may be performed through the first and/or second schemes described above, thereby implementing the terminal.
  • the terminal applies the bandwidth for the access procedure that has not been completed by the path-carrying bandwidth request message during the normal data transmission.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé permettant au terminal d'accéder au réseau, qui consiste notamment en ce que le terminal et la station de base achèvent le classement initial pour accéder d'abord au réseau, et permettre au terminal d'obtenir la largeur de bande lors de l'exécution du processus initial suivant, une fois le processus initial courant achevé, la station de base distribue d'abord la largeur de bande au terminal en vue de l'envoi de la demande du processus initial suivant, et envoie au terminal les informations concernant la largeur de bande; le terminal envoie la demande du processus suivant au moyen de la largeur de bande distribuée par la station de base; après réception de la demande, la station de base renvoie la réponse pertinente au terminal. L'invention concerne également un autre procédé permettant au terminal d'accéder au réseau et se caractérise en ce que la station de base distribue initialement la largeur de bande au terminal. Ce dernier obtient la largeur de bande correspondante pour achever le processus initial requis à exécuter après classement initial lors du processus d'accès, ce qui résout le problème d'intercommunication du processus d'accès du terminal du protocole IEEE 802.16, et assure l'accès du terminal au réseau à une vitesse plus grande.
PCT/CN2006/000031 2005-01-10 2006-01-10 Procede permettant a un terminal d'acceder au reseau WO2006072221A1 (fr)

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CN200510006058A CN100581285C (zh) 2005-01-10 2005-01-10 一种将终端接入网络的方法
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CN101924736B (zh) * 2009-06-16 2014-01-01 中兴通讯股份有限公司 动态主机配置协议报文的传输方法和装置
CN101932036A (zh) * 2009-06-23 2010-12-29 中兴通讯股份有限公司 终端接入WiMAX过程中获取IP地址的方法及系统
CN109041235A (zh) * 2018-08-20 2018-12-18 广东工业大学 一种差分定位系统的差分定位数据传输方法、装置及系统

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