WO2020124854A1 - 一种局域微蜂窝信号覆盖微基站装置 - Google Patents

一种局域微蜂窝信号覆盖微基站装置 Download PDF

Info

Publication number
WO2020124854A1
WO2020124854A1 PCT/CN2019/080342 CN2019080342W WO2020124854A1 WO 2020124854 A1 WO2020124854 A1 WO 2020124854A1 CN 2019080342 W CN2019080342 W CN 2019080342W WO 2020124854 A1 WO2020124854 A1 WO 2020124854A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
module
base station
main control
station device
Prior art date
Application number
PCT/CN2019/080342
Other languages
English (en)
French (fr)
Inventor
王运峰
Original Assignee
深圳市奥克多普科技有限公司
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 深圳市奥克多普科技有限公司 filed Critical 深圳市奥克多普科技有限公司
Publication of WO2020124854A1 publication Critical patent/WO2020124854A1/zh

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08Access point devices
    • H04W88/10Access point devices adapted for operation in multiple networks, e.g. multi-mode access points

Definitions

  • the invention relates to the technical field of communication, and in particular to a micro base station device covered by a local micro cell signal.
  • McWiLL Multi-Carrier Wireless Information Local Loop
  • a multi-carrier wireless information local loop is a broadband wireless access technology.
  • SPI Serial Peripheral Interface
  • serial peripheral interface a serial peripheral interface
  • MiFi Mobile WIFI
  • Mobile WIFI Mobile WIFI
  • an object of the present invention is to provide a local microcell signal covering micro base station device, which can freely switch between different network frequency bands and has good stability.
  • a local microcellular signal covering micro base station device including a main control module and a communication module for supporting access to different network frequency bands, the main control module is connected to the communication module, The main control module is used to control access to different network frequency bands.
  • the communication module includes a WiFi module, an RDA communication module, and a McWiLL communication module.
  • the device further includes an interface module, and the interface module is connected to the main control module.
  • the interface module includes a SIM card slot and a USB interface.
  • the device further includes an antenna.
  • the antenna includes a first antenna, a second antenna, a third antenna, and a fourth antenna.
  • the first antenna is connected to the main control module. Two antennas are connected to the WiFi module, the third antenna is connected to the RDA communication module, and the fourth antenna is connected to the McWiLL communication module.
  • the first antenna, the second antenna, and the third antenna are all FPC antennas, and the fourth antenna is an SMA antenna.
  • the device further includes an indicator light, and the indicator light is connected to the main control module.
  • the device further includes a switch, and the switch is connected to the main control module.
  • the device further includes a power supply module, and the power supply module is connected to the main control module.
  • a local micro cellular signal covering micro base station device the main control module is connected with a communication module, and the main control module is used to control the selection of access to different network frequency bands, overcoming the limitations of the prior art that wireless routers and MIFI are restricted by access to the network
  • FIG. 1 is a schematic diagram of a local micro-cell signal coverage micro-base station device of the present invention
  • FIG. 2 is a schematic circuit diagram of a micro base station device covering a local micro cell signal according to the present invention.
  • a local micro cellular signal covering micro base station device includes a main control module and a communication module for supporting access to different network frequency bands, the main control module is connected to the communication module, and the main control module is used to control the selection and access to different network frequency bands .
  • FIG. 1 is a schematic diagram of a local micro-cell signal coverage micro base station device of the present invention.
  • a local micro-cell signal coverage micro base station device includes a main control module, a WiFi module, an RDA communication module, and a McWiLL communication module ,
  • the main control module is connected with WiFi module, RDA communication module and McWiLL communication module respectively.
  • the device further includes a first antenna, a second antenna, a third antenna, and a fourth antenna, wherein the first antenna is connected to the main control module, the second antenna is connected to the WiFi module, and the third antenna communicates with the RDA The module is connected.
  • the fourth antenna is connected to the McWiLL communication module.
  • the first antenna, the second antenna, and the third antenna all use FPC antennas, and the fourth antenna uses SMA antennas.
  • the device further includes an interface module.
  • the interface module is connected to the main control module.
  • the interface module includes a SIM card slot, a USB interface, and a DC interface.
  • the SIM card slot is used to insert the first SIM card.
  • the external power supply provides working power for the device through the DC interface.
  • the device selects three network data access modes through the main control module.
  • the main control module is connected to the first SIM card for data access through the interface module, and the control option supports 2G/3G/4G network access; the main control module is connected to the McWiLL communication module, and the control option supports 1785-1805MHz narrow-band 3G/4G network access
  • the main control module connects to the RDA communication module to control and support GPRS network access.
  • the RDA communication module includes a second SIM card.
  • the device further includes a power supply module and a switch.
  • the power supply module and the switch are both connected to the main control module.
  • the power supply module is used to provide working power to the main control module; the switch controls the opening and closing of the device.
  • the device can charge the power module through the USB interface. That is, when an external power source is connected, the external power source is connected to the DC interface to provide working power to the device, and when no external power source is connected, the device is provided with working power through the power module.
  • the device further includes an indicator light, which is connected to the main control module.
  • the indicator light includes a power indicator light, a network status indicator light, and a network mode indicator light.
  • the power indicator is used to indicate whether the power is on
  • the network status indicator is used to indicate the network strength
  • the network mode indicator is used to indicate the selected network mode, including 2G/3G/4G network, McWiLL network.
  • the main control module includes a main control chip U1, the main control chip U1 uses an MSM8905 chip, and the RDA communication module includes a radio frequency chip U2 And the power amplifier chip U3, the radio frequency chip U2 uses the RDA88X9CL chip and the power amplifier chip U3 uses the RDA6625e chip, the WiFi module includes the WiFi chip U4, and the WiFi chip U4 uses the WCN3610 chip.
  • the main control chip U1 is connected to the first antenna L1, and the first antenna L1 is an FPC antenna.
  • the main control chip U1 is connected to the first SIM chip to realize support for 2G/3G/4G network access.
  • the main control chip U1 is connected to the first MOS transistor MOS1 through the MSM_GPIO port and the radio frequency chip U2, and the radio frequency chip U2 is controlled to be turned on and off by controlling the on and off of the first MOS transistor MOS1.
  • U3 is connected, and the power amplifier chip U3 is connected to the second antenna L2, and the second antenna L2 is an FPC antenna.
  • the radio frequency chip U2 is connected to the second SIM card, and the main control module U1 also implements data transmission with the radio frequency chip U2 through the UART interface and the I/O interface, and realizes the selective support of GPRS network access.
  • the main control chip U1 is connected to the McWiLL communication module through the I2S/SPI/GPIO interface.
  • the McWiLL communication module uses the XWBP02C chip, and the main control chip U1 is connected to the McWiLL communication module to control the support of 1785-1805MHz narrow-band 3G/4G Network access.
  • the main control chip U1 is also connected to the WiFi module U4, the WiFi module U4 uses a WCN3610 chip, the WiFi module U4 is connected to a third antenna L3, and the third antenna L3 is an FPC antenna.
  • the external power supply when an external power supply is connected, the external power supply provides working power to the main control chip U1 through the DCDCs interface, and when no external power supply is connected, the power supply module is charged through the USB interface, and the power module provides the main control chip Working power.
  • a local micro cellular signal covering micro base station device the main control module is connected with a communication module, and the main control module is used to control the selection of access to different network frequency bands, overcoming the limitations of the prior art that wireless routers and MIFI are restricted by access to the network

Abstract

本发明公开了一种局域微蜂窝信号覆盖微基站装置,包括主控模块和用于支持接入不同网络频段的通讯模块,所述主控模块与所述通讯模块连接,所述主控模块用于控制选择接入不同的网络频段。本发明涉及通信技术领域,一种局域微蜂窝信号覆盖微基站装置,主控模块与通讯模块连接,通过主控模块控制选择接入不同的网络频段,克服现有技术中无线路由器和MIFI均受制于接入网络的限制而不能自由切换网络的问题,降低接入网络对用户数据传输的影响,稳定性更好。

Description

一种局域微蜂窝信号覆盖微基站装置
技术领域
本发明涉及通信技术领域,尤其涉及一种局域微蜂窝信号覆盖微基站装置。
背景技术
McWiLL:Multi-Carrier Wireless Information Local Loop,多载波无线信息本地环路,是一种宽带无线接入技术。
SPI,全称Serial Peripheral Interface,串行外设接口。
UART,全称Universal Asynchronous Receiver/Transmitter,通用异步收发传输器。
MiFi(Mobile WIFI)是一个便携式宽带无线装置。
现有的路由器采用的是单芯片控制方案进行数据传输和数据分流,而MIFI则是接收无线网络GPRS/3G/4G数据流进行数据分流,两者功能相对单一。而且无线路由器和MIFI均受制于接入网络的限制,不能自由切换网络,导致对用户的数据传输直接受到接入网络的影响。
发明内容
本发明旨在至少在一定程度上解决相关技术中的技术问题之一。为此,本发明的一个目的是提供一种局域微蜂窝信号覆盖微基站装置,自由切换接入不同网络频段,稳定性好。
本发明所采用的技术方案是:一种局域微蜂窝信号覆盖微基站装置,包括主控模块和用于支持接入不同网络频段的通讯模块,所述主控模块与所述通讯模块连接,所述主控模块用于控制选择接入不同的网络频段。
作为上述方案的进一步改进,所述通讯模块包括WiFi模块、RDA通讯模块、McWiLL通讯模块。
作为上述方案的进一步改进,所述装置还包括接口模块,所述接口模块与所述主控模块连接。
作为上述方案的进一步改进,所述接口模块包括SIM卡槽、USB接口。
作为上述方案的进一步改进,所述装置还包括天线,所述天线包括第一天线、第二天线、第三天线和第四天线,所述第一天线与所述主控模块连接,所述第二天线与所述WiFi模块连接,所述第三天线与所述RDA通讯模块连接,所述第四天线与所述McWiLL通讯模块连接。
作为上述方案的进一步改进,所述第一天线、所述第二天线、所述第三天线均为FPC天线,所述第四天线为SMA天线。
作为上述方案的进一步改进,所述装置还包括指示灯,所述指示灯与所述主控模块连接。
作为上述方案的进一步改进,所述装置还包括开关,所述开关与所述主控模块连接。
作为上述方案的进一步改进,所述装置还包括电源模块,所述电源模块与所述主控模块连接。
本发明的有益效果是:
一种局域微蜂窝信号覆盖微基站装置,主控模块与通讯模块连接,通过主控模块控制选择接入不同的网络频段,克服现有技术中无线路由器和MIFI均受制于接入网络的限制而不能自由切换网络的问题,降低接入网络对用户数据传输的影响,稳定性更好。
附图说明
下面结合附图对本发明的具体实施方式作进一步说明:
图1是本发明一种局域微蜂窝信号覆盖微基站装置原理图;
图2是本发明一种局域微蜂窝信号覆盖微基站装置电路示意图。
具体实施方式
需要说明的是,在不冲突的情况下,本申请中的实施例及实施例中的特征可以相互组合。
一种局域微蜂窝信号覆盖微基站装置,包括主控模块和用于支持接入不同网络频段的通讯模块,主控模块与通讯模块连接,主控模块用于控制选择接入不同的网络频段。
图1是本发明一种局域微蜂窝信号覆盖微基站装置原理图,参照图1,一种局域微蜂窝信号覆盖微基站装置,包括主控模块、WiFi模块、RDA通讯模块、McWiLL通讯模块,主控模块分别与WiFi模块、RDA通讯模块、McWiLL通讯模块连接。
本实施例中,该装置还包括第一天线、第二天线、第三天线、第四天线,其中,第一天线与主控模块连接,第二天线与WiFi模块连接,第三天线与RDA通讯模块连接,第四天线与McWiLL通讯模块连接,第一天线、第二天线和第三天线均采用FPC天线,第四天线采用SMA天线。
本实施例中,该装置还包括接口模块,接口模块与主控模块连接,接口模块包括SIM卡槽、USB接口和DC接口。SIM卡槽用于插入第一SIM卡。外部电源通过DC接口为该装置提供工作电源。
本实施例中,具体的,该装置通过主控模块选择三种网络数据接入模式。主控模块通过接口模块连接第一SIM卡数据接入,控制选择支持2G/3G/4G网络接入;主控模块通过连接McWiLL通讯模块,控制选择支持1785-1805MHz窄频3G/4G网络接入;主控模块通过连接RDA通讯模块,控制选择支持GPRS网络接入,本实施例中,RDA通讯模块包括第二SIM卡。当用户使用该装置的数据流量时,用户终端通过WiFi模块与该装置连接,实现装置与用户终端的数据传输。
本实施例中,该装置还包括电源模块和开关,电源模块和开关均与主控模块连接,电源模块用于给主控模块提供工作电源;通过开关控制装置的开启与关闭。该装置可通过USB接口为电源模块充电。即当有外部电源接入时,通过外部电源接入DC接口给该装置提供工作电源,当没有外部电源接入时,通过电源模块给该装置提供工作电源。
本实施例中,该装置还包括指示灯,指示灯与主控模块连接,指示灯包括电源指示灯、网络状态指示灯和网络模式指示灯。其中,电源指示灯用于指示电源是否导通,网络状态指示灯用于指示网络强度,网络模式指示灯用于指示选择的网络模式,包括2G/3G/4G网络、McWiLL网络。
图2是本发明一种局域微蜂窝信号覆盖微基站装置电路示意图,结合图1和图2,主控模块包括主控芯片U1,主控芯片U1采用MSM8905芯片、RDA通讯模块包括射频芯片U2和功放芯片U3,射频芯片U2采用RDA88X9CL芯片和功放芯片U3采用RDA6625e芯片,WiFi模块包括WiFi芯片U4,WiFi芯片U4采用WCN3610芯片。
本实施例中,主控芯片U1与第一天线L1连接,第一天线L1为FPC天线。主控芯片U1与第一SIM片连接,实现支持2G/3G/4G网络接入。
本实施例中,主控芯片U1通过MSM_GPIO口连接第一MOS晶体管MOS1与射频芯片U2连接,通过控制第一MOS晶体管MOS1的通断进而控制开启与关闭连接射频芯片U2,射频芯片U2与功放芯片U3连接,功放芯片U3与第二天线L2连接,第二天线L2为FPC天线。射频芯片U2与第二SIM卡连接,主控模块U1还通过UART接口和I/O接口实现与射频芯片U2的数据传输,实现选择支持GPRS网络接入。
本实施例中,主控芯片U1通过I2S/SPI/GPIO接口与McWiLL通讯模块连接,McWiLL通讯模块采用XWBP02C芯片,主控芯片U1通过连接McWiLL通讯模块,控制选择支持1785-1805MHz窄频3G/4G网络接入。
本实施例中,主控芯片U1还与WiFi模块U4连接,WiFi模块U4采用WCN3610芯片,WiFi模块U4与第三天线L3连接,第三天线L3为FPC天线。
本实施例中,当有外部电源接入时,外部电源通过DCDCs接口给主控芯片U1提供工作电源,当没有外部电源接入时,通过USB接口给电源模块充电,电源模块给主控芯片提供工作电源。
一种局域微蜂窝信号覆盖微基站装置,主控模块与通讯模块连接,通过主控模块控制选择接入不同的网络频段,克服现有技术中无线路由器和MIFI均受制于接入网络的限制而不能自由切换网络的问题,降低接入网络对用户数据传输的影响,稳定性更好。
以上是对本发明的较佳实施进行了具体说明,但本发明创造并不限于所述实施例,熟悉本领域的技术人员在不违背本发明精神的前提下还可作出种种的等同变形或替换,这些等同的变形或替换均包含在本申请权利要求所限定的范围内。

Claims (9)

  1. 一种局域微蜂窝信号覆盖微基站装置,其特征在于,其包括主控模块和用于支持接入不同网络频段的通讯模块,所述主控模块与所述通讯模块连接,所述主控模块用于控制选择接入不同的网络频段。
  2. 根据权利要求1所述的一种局域微蜂窝信号覆盖微基站装置,其特征在于,所述通讯模块包括WiFi模块、RDA通讯模块、McWiLL通讯模块。
  3. 根据权利要求1或2所述的一种局域微蜂窝信号覆盖微基站装置,其特征在于,所述装置还包括接口模块,所述接口模块与所述主控模块连接。
  4. 根据权利要求3所述的一种局域微蜂窝信号覆盖微基站装置,其特征在于,所述接口模块包括SIM卡槽、USB接口。
  5. 根据权利要求2所述的一种局域微蜂窝信号覆盖微基站装置,其特征在于,所述装置还包括天线,所述天线包括第一天线、第二天线、第三天线和第四天线,所述第一天线与所述主控模块连接,所述第二天线与所述WiFi模块连接,所述第三天线与所述RDA通讯模块连接,所述第四天线与所述McWiLL通讯模块连接。
  6. 根据权利要求5所述的一种局域微蜂窝信号覆盖微基站装置,其特征在于,所述第一天线、所述第二天线、所述第三天线均为FPC天线,所述第四天线为SMA天线。
  7. 根据权利要求1所述的一种局域微蜂窝信号覆盖微基站装置,其特征在于,所述装置还包括指示灯,所述指示灯与所述主控模块连接。
  8. 根据权利要求1所述的一种局域微蜂窝信号覆盖微基站装置,其特征在于,所述装置还包括开关,所述开关与所述主控模块连接。
  9. 根据权利要求1所述的一种局域微蜂窝信号覆盖微基站装置,其特征在于,所述装置还包括电源模块,所述电源模块与所述主控模块连接。
PCT/CN2019/080342 2018-12-17 2019-03-29 一种局域微蜂窝信号覆盖微基站装置 WO2020124854A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201811540679.8A CN109548200A (zh) 2018-12-17 2018-12-17 一种局域微蜂窝信号覆盖微基站装置
CN201811540679.8 2018-12-17

Publications (1)

Publication Number Publication Date
WO2020124854A1 true WO2020124854A1 (zh) 2020-06-25

Family

ID=65855076

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2019/080342 WO2020124854A1 (zh) 2018-12-17 2019-03-29 一种局域微蜂窝信号覆盖微基站装置

Country Status (2)

Country Link
CN (1) CN109548200A (zh)
WO (1) WO2020124854A1 (zh)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203279207U (zh) * 2013-04-18 2013-11-06 浙江金之路信息科技有限公司 一种基于多网络融合的智能网关设备
CN103607716A (zh) * 2013-11-07 2014-02-26 北京邮电大学 一种异构无线网络中高能效混合带宽分配传输方法和设备
CN109548199A (zh) * 2018-12-17 2019-03-29 深圳市奥克多普科技有限公司 一种局域微蜂窝信号覆盖微基站应用系统
CN109548198A (zh) * 2018-12-17 2019-03-29 深圳市奥克多普科技有限公司 一种局域微蜂窝信号覆盖微基站结构
CN109640364A (zh) * 2018-12-17 2019-04-16 深圳市奥克多普科技有限公司 一种局域微蜂窝信号覆盖基站网络切换方法、装置及设备

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202406309U (zh) * 2012-01-18 2012-08-29 中国移动通信集团公司 一种双模装置
GB2522005A (en) * 2013-11-26 2015-07-15 Vodafone Ip Licensing Ltd Mobile WiFi
CN105848231B (zh) * 2015-01-14 2019-05-24 中兴通讯股份有限公司 Wifi设备及其中wifi芯片的工作方法、装置
CN107359698B (zh) * 2016-05-10 2019-08-02 北京电研华源电力技术有限公司 一种配电网区域智能终端
CN207135283U (zh) * 2017-08-02 2018-03-23 柒星通信科技(北京)有限公司 一种mifi装置
CN207560037U (zh) * 2017-09-11 2018-06-29 深圳市广联智通科技有限公司 一种带电源功能的4g无线路由器
CN107770080B (zh) * 2017-11-27 2024-01-30 华南师范大学 基于金属边框外壳的移动式MIMO WiFi路由器
CN207802394U (zh) * 2017-11-30 2018-08-31 深圳市匹亚比电子有限公司 Mifi设备
CN108271167A (zh) * 2018-01-04 2018-07-10 苏州蜗牛数字科技股份有限公司 一种多路云卡mifi通讯系统及方法
CN209283538U (zh) * 2018-12-17 2019-08-20 深圳市奥克多普科技有限公司 一种局域微蜂窝信号覆盖微基站装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203279207U (zh) * 2013-04-18 2013-11-06 浙江金之路信息科技有限公司 一种基于多网络融合的智能网关设备
CN103607716A (zh) * 2013-11-07 2014-02-26 北京邮电大学 一种异构无线网络中高能效混合带宽分配传输方法和设备
CN109548199A (zh) * 2018-12-17 2019-03-29 深圳市奥克多普科技有限公司 一种局域微蜂窝信号覆盖微基站应用系统
CN109548198A (zh) * 2018-12-17 2019-03-29 深圳市奥克多普科技有限公司 一种局域微蜂窝信号覆盖微基站结构
CN109640364A (zh) * 2018-12-17 2019-04-16 深圳市奥克多普科技有限公司 一种局域微蜂窝信号覆盖基站网络切换方法、装置及设备

Also Published As

Publication number Publication date
CN109548200A (zh) 2019-03-29

Similar Documents

Publication Publication Date Title
WO2014040439A1 (zh) 一种无线网络系统及便携式电子设备
WO2011034405A2 (en) System and method for power saving by coordinated wake-up in a wireless multi-band network
US20130051329A1 (en) Radio equipment and radio base station
WO2015074374A1 (zh) 移动设备及其网络连接方法
CN202587118U (zh) 一种具备wlan接入功能的无线座机
WO2016008270A1 (zh) 一种支持公用无线网络和专用网络的lte移动终端
WO2014086056A1 (zh) 一种用于移动终端的具有无线通信功能的套件装置
BRPI0105645B1 (pt) método para uma unidade móvel bi-modal arranjada para transmitir e receber sinais usando primeiro e segundo protocolos sem fio, unidade móvel bi-modal e sistema para operar uma unidade móvel bi-modal
WO2016023337A1 (zh) 一种车载无线局域网设备
WO2010130168A1 (zh) 热点装置
CN101350782A (zh) 数据通信方法和系统
WO2012048549A1 (zh) 支持多种方式接入的带路由功能的移动终端及其实现方法
CN208316744U (zh) 一种基于区域宽带无线网络的背负通信系统
WO2014014281A1 (ko) 무선랜 시스템에서 능동 검색 방법
EP2526719A2 (en) Method and apparatus for performing handover
WO2016200133A1 (ko) 안테나 장치
CN107484143A (zh) 一种基于无线网络的对讲设备及其对讲通讯方法
WO2014019296A1 (zh) 一种基于位置的移动终端电源管理装置
WO2020124853A1 (zh) 一种局域微蜂窝信号覆盖微基站应用系统
WO2020124854A1 (zh) 一种局域微蜂窝信号覆盖微基站装置
CN211296722U (zh) 一种低压电力线高速载波转蓝牙的通信系统
CN207382553U (zh) 一种蓝牙无线分享手环
WO2020124852A1 (zh) 一种局域微蜂窝信号覆盖微基站结构
KR100397335B1 (ko) 이동단말기와 무선랜의 통합단말 장치
CN209402743U (zh) 一种局域微蜂窝信号覆盖微基站应用系统

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19900458

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19900458

Country of ref document: EP

Kind code of ref document: A1

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC (EPO FORM 1205A DATED 05.11.2021)

122 Ep: pct application non-entry in european phase

Ref document number: 19900458

Country of ref document: EP

Kind code of ref document: A1