WO2005048534A1 - Procede de formation de sequence de saut de frequence dans un reseau cellulaire blue tooth - Google Patents

Procede de formation de sequence de saut de frequence dans un reseau cellulaire blue tooth Download PDF

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Publication number
WO2005048534A1
WO2005048534A1 PCT/CN2004/001288 CN2004001288W WO2005048534A1 WO 2005048534 A1 WO2005048534 A1 WO 2005048534A1 CN 2004001288 W CN2004001288 W CN 2004001288W WO 2005048534 A1 WO2005048534 A1 WO 2005048534A1
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WO
WIPO (PCT)
Prior art keywords
frequency hopping
hopping sequence
master device
bluetooth
generating
Prior art date
Application number
PCT/CN2004/001288
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English (en)
Chinese (zh)
Inventor
Bin Li
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Huawei Technologies Co., Ltd.
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Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2005048534A1 publication Critical patent/WO2005048534A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/7143—Arrangements for generation of hop patterns
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks

Definitions

  • the present invention relates to a method for using frequencies in a Bluetooth network, and in particular, to a method for generating a frequency hopping sequence for implementing a Bluetooth cellular network.
  • Bluetooth technology is a standard that uses radio to interconnect short-range devices. As the access network side gradually develops wirelessly, Bluetooth technology is gradually gaining wider and wider application.
  • Bluetooth adopts decentralized or distributed network structure and short packet technology
  • duplex mode adopts time division duplex
  • TDD Bluetooth supports both circuit-type data and packet-type data. It supports point-to-point and point-to-multipoint communication. It works in the 2.4G industrial, scientific, and medical (ISM) frequency band. Generally, all countries limit this frequency band. Transmission range and power, but without approval and permission.
  • ISM industrial, scientific, and medical
  • the basic unit of Bluetooth networking is called piconet.
  • a Bluetooth device is used as the master node, and the Bluetooth device may be called the master device.
  • Other Bluetooth devices are used as slave nodes.
  • the Bluetooth device may be It is called a slave device, and there can be a maximum of 7 slave nodes; however, more slave nodes and the master node are allowed to remain in the state of no access channel (Park).
  • the access of the slave node to the channel is controlled by the master node.
  • a pico network can have overlap in coverage, that is, a master node of a pico network can be a slave node of another network at the same time; a slave node can belong to multiple networks.
  • Bluetooth Since Bluetooth works in the ISM band that does not require application and approval, it requires Bluetooth technology to have considerable anti-interference ability. Therefore, Bluetooth uses a fast frequency hopping technology.
  • Bluetooth is on the ISM band, with 1M as a frequency point. There are a total of 79 frequency points, and the frequency hops 1600 times per second. From the time domain perspective, each time slot is 625us in length. Each time slot selects one of 79 channels for data transmission.
  • Each piconet has its own frequency hopping scheme. In a piconet, the time that a node stays at a frequency point is called the dwell time, which is 625us. The position of the frequency point where the user stays in the frequency hopping sequence is called phase. Refer to FIG. 1 for a Bluetooth frequency hopping method.
  • FIG. 1 for a Bluetooth frequency hopping method.
  • FIG. 1 is a schematic diagram of a Bluetooth frequency hopping in the prior art.
  • a Bluetooth node and The frequency at which other nodes communicate with each other changes in a continuous transition. If there is relatively strong interference at one frequency point, the probability of strong interference in the next frequency band will be small, and the information lost in the previous stage can be retransmitted at this moment, so Bluetooth technology can resist certain interference.
  • Bluetooth technology has certain confidentiality.
  • the frequency hopping sequence is controlled by the frequency hopping sequence.
  • Each Bluetooth device has a frequency hopping sequence generator, and the frequency hopping sequence is generated by the frequency hopping sequence generator. See FIG. 2 and FIG. 2 for a schematic diagram of generating a Bluetooth frequency hopping sequence in the prior art.
  • the clock signal of the input frequency hopping sequence generator 200 is the clock of the master device in the piconet. Part of the information of the clock signal is used to determine the current phase, and part of the information is used to determine the frequency hopping sequence together with the address information.
  • the address information is the address of the master device and is mainly used to determine the final frequency hopping sequence together with some information of the clock signal.
  • Each Bluetooth device has a unique 48-bit device address (BD-ADDR).
  • the frequency hopping sequence of the Bluetooth device is determined by the master device, and the slave device must follow the frequency hopping sequence determined by the master device.
  • the master device sends its own BD-ADDR information and clock signals to the slave device.
  • the slave device After the slave device synchronizes the local clock with the master device clock, its frequency hopping sequence generator according to the master device
  • the BD_ADDR information and the master device clock signal generate the same frequency hopping sequence as the master device.
  • the master device sending data to the slave device can only occupy even time slots, and the slave device can send data to the master device only at odd time slots.
  • the transmission of a packet (Packet) or frame can occupy up to 5 time slots. During the transmission period of a packet, the channel occupied by the initial time slot is maintained without frequency hopping.
  • a maximum of 79 devices can occupy frequency resources at the same time, that is, 79 frequency hopping sequences coexist.
  • the frequency hopping sequences that can coexist will be less than 79, and the specific number will depend on the selection of the address information and the acceptable level of collision and interference.
  • There are two different types of links between the master and slave devices namely a synchronous connection-oriented (SCO) link and an asynchronous connection-less (ACL) link.
  • SCO synchronous connection-oriented
  • ACL asynchronous connection-less
  • SCO is a point-to-point link, and the master maintains SCO on periodic reserved time slots;
  • ACL is a point-to-multipoint link.
  • the master device can use the time slot occupied by the SCO to establish the ACL link, and the slave device can participate in both the SCO and the ACL.
  • SCO has two-way symmetry and can be regarded as a circuit connection. It is usually used to support real-time services such as voice.
  • the master device can establish up to 3 SCO links with one or more slave devices; one slave device can also establish SCO links with multiple master devices (up to 3).
  • SCO packets do not use a retransmission mechanism.
  • the time slot not occupied by the SCO can be used for ACL, and there is only one ACL between a pair of master and slave devices.
  • ACL packet transmission uses retransmission mechanism to ensure correctness. Only when the master device in some way allows a slave device to send data in the packet sent to the slave device, the slave device can send data in the specified time slot.
  • ACL supports broadcasting.
  • Bluetooth is a short-range wireless technology that is generally applied to the interconnection of electrical appliances within the home. Therefore, Bluetooth was not designed to form a large network like the mobile communication system currently used. With the popularity of Bluetooth technology and the gradual expansion of its application range, the above-mentioned Bluetooth network frequency usage methods have also revealed the following two shortcomings:
  • the object of the present invention is to provide a frequency hopping sequence generation for Bluetooth cellular networking. This method can increase and reasonably allocate network capacity and reduce interference between piconet.
  • the entire frequency resource space is divided into multiple frequency hopping sequence sets. According to the manner of cellular networking, a frequency hopping sequence set is assigned to each Bluetooth piconet for networking, and adjacent piconets are assigned different frequency hopping sequences.
  • each master device of the Bluetooth piconet set the same number of frequency hopping sequence generators according to the number of frequency hopping sequences included in the frequency hopping sequence set allocated by it;
  • each frequency hopping sequence generator in the master device corresponds to seven or fewer slave devices in the Bluetooth piconet; the frequency hopping sequence generated by the slave device and the corresponding frequency hopping sequence in the master device are generated
  • the frequency hopping sequence generated by the controller is synchronized.
  • step 1) the entire frequency resource space may be divided into 6 or 7 or 8 frequency hopping sequence sets.
  • the 3) may include: the master device generates the same amount of pseudo address information as the frequency hopping sequence generator; one pseudo address information corresponds to seven or less slave devices in the Bluetooth 4 ⁇ micronet; each frequency hopping sequence The generator uses a pseudo address information and a master device clock signal to generate a frequency hopping sequence; and the master device sends its clock signal and the generated pseudo address information to the corresponding slave devices respectively;
  • Each of the slave devices of the Bluetooth piconet uses the pseudo address information and the master device clock signal received from the master device to generate a frequency hopping sequence synchronized with a frequency hopping sequence generated by the master device.
  • the method for generating pseudo-address information by the master device may be: setting an address converter in the master device, which converts the device address of the master device and a preset frequency hopping sequence constraint condition into a
  • the frequency sequence generator has the same amount of pseudo address information.
  • the number of frequency hopping sequences included in each frequency hopping sequence set may be the same or different.
  • the number of frequency hopping sequences contained in its assigned frequency hopping sequence set can be set in advance according to the number of slave devices that the Bluetooth piconet that the master device needs to accommodate and the degree of interference and collision it can receive.
  • the method for generating a frequency hopping sequence for implementing Bluetooth cellular networking of the present invention divides the entire frequency resource space into multiple frequency hopping sequence sets, and generates multiple frequency hopping sequences in the master device to generate Device, enabling each Bluetooth piconet to generate a frequency hopping sequence set according to the cellular networking mode, Neighbor ⁇ : ⁇ : The network generates different frequency hopping sequence sets, and the slave device generates a frequency hopping sequence synchronized with a frequency hopping sequence in the frequency hopping sequence set.
  • the frequency hopping sequence generation method of the present invention reduces the possibility of adjacent micro: net frequency hopping sequence conflicts, expands the total capacity of the network and promotes the reasonable distribution of capacity, and at the same time reduces the neighboring Bluetooth piconet. Interference.
  • FIG. 1 is a schematic diagram of a prior art Bluetooth frequency hopping
  • FIG. 2 is a schematic diagram of generating a Bluetooth frequency hopping sequence in the prior art
  • FIG. 3 is a schematic diagram of the aerial frequency reuse of a Bluetooth frequency hopping sequence set according to a preferred embodiment of the present invention
  • FIG. 4 is a schematic diagram of generating a frequency hopping sequence set by a master device of a Bluetooth Ao micronet in the embodiment shown in FIG. 3.
  • the method for generating a frequency hopping sequence for realizing a Bluetooth cellular network refers to a frequency planning method for a global mobile communication system (GSM) group cellular network.
  • GSM global mobile communication system
  • the entire frequency resource space is divided into multiple frequency hopping sequence sets.
  • Each Bluetooth piconet to be networked is assigned a frequency hopping sequence set, and the adjacent piconet is assigned a different frequency hopping sequence set.
  • the same number of frequency hopping sequence generators are set according to the number of frequency hopping sequences included in its allocated frequency hopping sequence set.
  • the frequency hopping sequence generated by each frequency hopping sequence generator in its master device should be synchronized with the frequency hopping sequence generated by the seven generators in the Bluetooth piconet, so that the frequency hopping sequence set is multiplexed in the air.
  • FIG. 3 is a schematic diagram of over-the-air multiplexing of a Bluetooth frequency hopping sequence set according to a preferred embodiment of the present invention.
  • the air multiplexing mode of the frequency hopping sequence set in this embodiment refers to the allocation method of the cellular network.
  • the entire frequency resource space is divided into 7 frequency hopping sequence sets (HSS).
  • HSS frequency hopping sequence sets
  • Each piconet uses a frequency hopping sequence set.
  • the frequency sequence set contains multiple frequency hopping sequences, and the adjacent piconet uses different frequency hopping sequence sets. Among them, 7 adjacent piconets make up a basic unit, Row overlap expansion. After crossing a basic unit, the same frequency can be reused again, forming a frequency reuse of frequency hopping sequence resources in space.
  • the resources available for each piconet are pre-allocated, and the frequency resources can be effectively reused.
  • the frequency hopping sequence between adjacent cells does not have any overlapping portion or the overlapping portion is small, the interference between adjacent cells will be reduced, which can effectively improve the communication quality and network capacity of nodes in the network.
  • frequency hopping sequence sets are used as basic units for spatial multiplexing.
  • other numbers of frequency hopping sequence sets may be used for spatial multiplexing, such as 6 or 8 groups.
  • the number of frequency hopping sequences owned by different groups may be uneven.
  • HSS1 in Figure 3 has more frequency hopping sequences than HSS2.
  • Even the frequency allocations in different basic units may not be exactly the same.
  • HSS1 in Figure 3 use different frequency hopping sequence sets, which means that the HSS1 used by two piconets may not be completely the same. equal.
  • this uneven distribution method can better adapt to the distribution of user traffic.
  • FIG. 4 is a schematic diagram of generating a frequency hopping sequence set by a master device of a Bluetooth network in the embodiment shown in FIG. 3.
  • an address converter 401 is provided, and the same number of frequency hopping sequence generators 402 are set according to the number of frequency hopping sequences included in the frequency hopping sequence set allocated by the address converter.
  • the frequency hopping sequence set allocated by the piconet includes four frequency hopping sequences, and the master device of the piconet is provided with four frequency hopping sequence generators 402.
  • the address converter 401 address conversion algorithm can be various, for example, regardless of the clock signal or the address information of the master device, it can be selected entirely by the frequency hopping constraint condition, as long as the pseudo address information can be used to generate the piconet allocation. Frequency hopping sequence set.
  • the master device can also generate pseudo-address information without using an address converter.
  • the most convenient method is as follows: According to the number of slave devices that the Bluetooth piconet needs to accommodate and the degree of interference and conflict it can receive, Set the same amount of pseudo address information as the frequency hopping sequence generator.
  • the preset pseudo-address information and the above-mentioned frequency hopping constraints can be configured through the management system of the master device.
  • the frequency hopping sequence is basically determined by the address information
  • the pseudo address information when selecting the pseudo address information, the pseudo address information with little mutual interference of the frequency hopping sequence generated by the pseudo address information is selected.
  • the number of selected pseudo address information depends on Specific address content and acceptable levels of interference and conflict. If the phase hopping sequence generated by these pseudo address information can be made small, the number of these pseudo address information can be very close to 79 in theory.
  • each frequency hopping sequence generator 402 generates a frequency hopping sequence using a pseudo address information and a master device clock signal, and the four frequency hopping sequence generators 402 generate a frequency hopping sequence set including four frequency hopping sequences.
  • the master device sends its clock signal and the generated 4 pseudo-address information to the corresponding 7 slave devices.
  • the slave device uses the pseudo address information received from the master device and the master device clock signal to generate a frequency hopping sequence synchronized with a frequency hopping sequence generated by the master device.
  • the set of frequency hopping sequences allocated by the piconet includes four frequency hopping sequences, so the master device of the piconet is provided with four frequency hopping sequence generators 402.
  • the frequency is based on the requirements of the Bluetooth piconet
  • the number of slave devices and the degree of interference and conflict that can be received are set in advance in the number of frequency hopping sequences included in its assigned frequency hopping sequence set and the number of frequency hopping sequence generators.
  • the method for generating a frequency hopping sequence for implementing Bluetooth cellular networking expands the total capacity of the network and promotes a reasonable distribution of capacity, and at the same time reduces the distance between adjacent Bluetooth piconets. interference.

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

Abstract

L'invention concerne un procédé de formation de séquence de saut de fréquence dans un réseau cellulaire blue tooth. Selon ce procédé, l'intégralité des ressources de fréquence sont divisées en plusieurs ensembles de séquences de saut de fréquence, conformément à la forme d'établissement du réseau cellulaire. Chacun des piconets blue tooth génère un ensemble de séquences de saut de fréquence, les piconets adjacents pouvant générer différents ensembles de séquences de saut de fréquence via la configuration d'un certain nombre de générateurs de séquences de saut de fréquence et la production d'informations de pseudo-adresse dans le dispositif principal. Le procédé de formation de séquence de saut de fréquence peut favoriser une distribution satisfaisante du réseau et développer sa capacité globale, tout en réduisant les interférences entre les piconets blue tooth adjacents.
PCT/CN2004/001288 2003-11-14 2004-11-12 Procede de formation de sequence de saut de frequence dans un reseau cellulaire blue tooth WO2005048534A1 (fr)

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CN200310116258.X 2003-11-14
CNB200310116258XA CN100372248C (zh) 2003-11-14 2003-11-14 一种实现蓝牙蜂窝组网的跳频序列生成方法

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WO2007040610A1 (fr) * 2005-09-14 2007-04-12 Matsushita Electric Industrial Co., Ltd. Procede de gestion de balises pour piconets de fusion
CN101626268B (zh) * 2009-08-12 2012-10-17 广州海格通信集团股份有限公司 一种窄带高速跳频同步实现方法
CN103117772B (zh) * 2013-02-05 2014-11-26 北京芯同汇科技有限公司 无线传感器网络中的同步跳频方法及系统
CN106162502A (zh) * 2015-03-20 2016-11-23 北京虎符科技有限公司 安全蓝牙通讯设备
US9948351B2 (en) * 2016-07-01 2018-04-17 Intel IP Corporation Short range radio communication device and a method of controlling a short range radio communication device
CN106951184A (zh) * 2017-02-28 2017-07-14 惠州华阳通用电子有限公司 一种蓝牙地址生成方法
CN107276630B (zh) * 2017-08-10 2019-08-02 北京图森未来科技有限公司 一种跳频通信方法及系统
CN111698671B (zh) * 2020-05-26 2023-07-21 昆山海菲曼科技集团股份有限公司 一种蓝牙遥控器
CN111970669B (zh) * 2020-08-17 2023-11-24 立讯电子科技（昆山）有限公司 一种蓝牙连接方法、装置及蓝牙设备
CN113645601A (zh) * 2021-08-18 2021-11-12 中国第一汽车股份有限公司 一种车载蓝牙通信方法、装置、车辆及存储介质

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CN100372248C (zh) 2008-02-27

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