WO2013159618A1 - Procédé et dispositif permettant de transmettre des informations de diffusion sur la base d'un système de communication mobile par satellite - Google Patents

Procédé et dispositif permettant de transmettre des informations de diffusion sur la base d'un système de communication mobile par satellite Download PDF

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Publication number
WO2013159618A1
WO2013159618A1 PCT/CN2013/073016 CN2013073016W WO2013159618A1 WO 2013159618 A1 WO2013159618 A1 WO 2013159618A1 CN 2013073016 W CN2013073016 W CN 2013073016W WO 2013159618 A1 WO2013159618 A1 WO 2013159618A1
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WO
WIPO (PCT)
Prior art keywords
satellite
information
broadcast information
cells
access point
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Application number
PCT/CN2013/073016
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English (en)
Chinese (zh)
Inventor
秦飞
周海军
鲍炜
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电信科学技术研究院
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Publication of WO2013159618A1 publication Critical patent/WO2013159618A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a broadcast information transmission method and apparatus based on a satellite mobile communication system.
  • a satellite mobile communication system can be deployed by using an LTE (Long Term Evolution) system/LTE-A (LTE-Advanced) system, which includes a mobile communication system in a transparent forwarding mode.
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution-Advanced
  • the satellite mobile communication system with on-board processing mode as shown in Fig. 1, in the satellite mobile communication system in the transparent forwarding mode, the satellite access point device (such as eNodeB) is deployed on the ground, and the data of the satellite terminal is received by the satellite.
  • the satellite access point device Transparently forwarded to the satellite access point device; and as shown in Figure 2, in the satellite mobile communication system with on-board processing mode, the satellite access point device is deployed on the satellite, and the satellite access point device and the satellite terminal pass through the air interface. Connected and communicated with the ground gateway through satellite, and the ground gateway communicates with the core network. As shown in Fig.
  • a spatial narrow beam can be formed on a satellite through a shaped network by means of multiple feeds (usually dozens or even hundreds) and satellite antennas on the satellite, and each Beams are equivalent to one cell; due to satellite to ground propagation distance Far away, the beam design concept of the satellite mobile communication system is: 1) Maximize the beamforming gain, and form a total gain of up to 40-50 dBi through multiple feeds and antennas; 2) A single beam angle is narrow, such as As shown in Figure 4, taking GEO (synchronous orbit satellite) as an example, in order to improve the capacity of the satellite system, the coverage distance of a single beam on the ground is required to be within 400-500Km. According to the satellite orbital distance of 36000Km, the bandwidth of a single beam is usually 0.6 degrees. Left and right; 3) The beam center and edge coverage levels are as balanced as possible.
  • GEO synchronous orbit satellite
  • both downlink and uplink exhibit strong power-limited characteristics; on the downlink, satellites are required to transmit at a large power to ensure ground reception.
  • the power on the satellite is often limited; on the uplink, due to the limited power of the satellite terminal, the satellite receiver is usually required to have high sensitivity; based on this, the coverage of the beam of the satellite communication at the center and the edge of the cell is required. Flat as much as possible.
  • the ground coverage level is required to be the same as possible, and the signal strength difference between the cell center and the cell edge is small; based on this, the inter-cell handover of the satellite mobile communication system
  • the stack is very serious. If each cell adopts the same-frequency networking, there will be strong interference between the cells, that is, the same-frequency interference will be very serious. Therefore, in order to ensure the communication quality, the satellite mobile communication system generally adopts the inter-frequency networking mode.
  • a typical frequency multiplexing method is as in a conventional cellular system, and its frequency multiplexing system is 7.
  • a PBCH Physical Broadcast Channel
  • MIB Master Information
  • the MIB information includes the following: downlink bandwidth indication, PHICH (Physical HARQ Indication Channel) configuration information (for supporting PHICH channel and related information), system frame number (for terminal downlink) Frame sync) and so on.
  • Embodiments of the present invention provide a broadcast information transmission method and apparatus based on a satellite mobile communication system to transmit satellite orbit position information and/or absolute time value information of a current frame to a satellite terminal.
  • an embodiment of the present invention provides a broadcast information transmission method based on a satellite mobile communication system, including:
  • the satellite access point device obtains broadcast information, the broadcast information carrying satellite orbit position information and/or absolute time value information of the current frame;
  • the satellite access point device transmits the broadcast information to a satellite terminal.
  • the embodiment of the invention provides a broadcast information transmission device based on a satellite mobile communication system, and the device includes:
  • an obtaining module configured to obtain broadcast information, where the broadcast information carries satellite orbit position information and/or absolute time value information of a current frame;
  • a sending module configured to send the broadcast information to a satellite terminal.
  • the satellite access point device may carry the satellite orbit position information and/or the absolute time value information of the current frame in the broadcast information and transmit the information to the broadcast information.
  • Satellite terminal further, after receiving the satellite orbit position information and/or the absolute time value information of the current frame, the satellite terminal can The satellite orbit position information and/or the absolute time value information of the current frame are used to determine the specific geographical position of the satellite, so that the timing advance amount can be calculated based on the position information of the satellite and the specific geographical position of the satellite, and the advancement amount is faster based on the timing.
  • FIG. 1 is a schematic diagram of a satellite mobile communication system in a transparent forwarding mode in the prior art
  • FIG. 2 is a schematic diagram of a satellite mobile communication system in an on-board processing mode in the prior art
  • FIG. 3 is a space formed by a shaping network in the prior art
  • Schematic diagram of a narrow beam
  • FIG. 4 is a schematic diagram of a single beam angle being narrow in the prior art
  • FIG. 5 is a schematic diagram showing the performance of the power limiting feature in both the downlink and the uplink in the prior art
  • FIG. 6 is a schematic diagram of networking in an inter-frequency networking manner in the prior art
  • FIG. 7 is a schematic flowchart of a broadcast information transmission method based on a satellite mobile communication system according to Embodiment 1 of the present invention.
  • FIG. 8 is a schematic structural diagram of a broadcast information transmission apparatus based on a satellite mobile communication system according to Embodiment 2 of the present invention.
  • Embodiment 1 of the present invention provides a broadcast information transmission method based on a satellite mobile communication system, which can be deployed based on an LTE system/LTE-A system, and the method can be applied to a satellite mobile communication system in a transparent forwarding mode.
  • the method includes the following steps: Step 701: A satellite access point device (such as an eNodeB) obtains broadcast information, and carries at least satellite orbit position information and/or absolute time value information of a current frame in the broadcast information. It is noted that the absolute of the current frame is adopted.
  • the time value information can obtain information on the position of the satellite orbit, such as the height of the satellite from the ground.
  • the method is not suitable for the satellite mobile communication system; based on this, in the embodiment of the present invention, at least the satellite orbit position information and/or the absolute time value information of the current frame need to be carried in the broadcast information.
  • the satellite terminal can determine the specific geographical position of the satellite by using the satellite orbit position information and/or the absolute time value information of the current frame, thereby The timing advance is calculated based on the location information of the location and the specific geographic location of the satellite, and the relevant signal is transmitted to the satellite faster based on the timing advance.
  • the satellite terminal can calculate the timing advance according to its own location information (based on the GPS (Global Positioning System) function of the satellite terminal), so the satellite terminal can be faster. Sending relevant signals to the satellite can also reduce the time window.
  • the satellite terminal since there are some security risks in transmitting satellite orbital position information, it is also possible to transmit the absolute of the current frame to the satellite terminal.
  • the time value information after receiving the absolute time value information, the satellite terminal can calculate the delay according to its own time, so the satellite terminal can send the relevant signal to the satellite faster.
  • the satellite orbital position information includes at least but not limited to one or any combination of the following: type information of the satellite; altitude information of the satellite from the ground; angle information of the satellite.
  • the type information of the satellite may be a synchronous satellite, a low orbit satellite, and a medium orbit satellite; in practical applications, the type information of the satellite may be 2-bit information.
  • the synchronous satellite may be represented by 00, and represented by 01. Low-orbit satellites, with 10 indicating medium-orbiting satellites, and 11 indicating other types of satellites.
  • the altitude information of the satellite from the ground can be 100-40000Km; in practical applications, 16-bit information can be used to indicate the height information of the satellite from the ground, and Km is the unit.
  • the angle information of the satellite includes the longitude information of the satellite, which can be 0.01 degrees as the basic unit.
  • the satellite orbital position information may further include: attitude information of the satellite and antenna direction information of the satellite.
  • the satellite orbital position information may further include other information, which is not repeatedly described in the embodiment of the present invention.
  • the absolute time value information of the current frame includes: an absolute time value of the current frame to the ear of the synchronous transmission period, and the absolute time value of the current frame needs to be accurate to the us level.
  • HARQ Hybrid Auto Repeat request
  • the broadcast information may include, but is not limited to, the following contents in addition to the satellite orbit position information: system bandwidth information, the system bandwidth information is defined by the LTE system/LTE-A system, and supports 6, 15, 25 50, 75, 100 PRB (Physical Resource Block);
  • the frame number information of the cell, the multiple cell frame numbers of the same satellite may be the same.
  • the broadcast information may not carry the PHICH configuration information, that is, the broadcast information is specifically the broadcast information that does not include the PHICH configuration information.
  • the broadcast information may also carry the PHICH configuration information according to actual needs. This is no longer a detailed comment.
  • the other information may be carried by other reserved bit information in the broadcast information, which is not repeatedly described in the embodiment of the present invention.
  • Step 702 The satellite access point device sends the broadcast information to the satellite terminal.
  • the broadcast information may specifically be MIB information.
  • a process in which a satellite access point device transmits broadcast information to a satellite terminal includes but is not limited to the following manners:
  • Method 1 For multiple cells formed by multiple Beams of the same satellite, The satellite access point device transmits the same broadcast information to satellite terminals in multiple cells.
  • the content in the MIB information can be designed to be the same content for multiple cells formed by multiple beams of the same satellite, that is, the MIB information content of each cell on the same satellite is the same.
  • Method 2 The satellite access point device sends the broadcast information scrambled according to the basic scrambling code to the satellite terminal; or the satellite access point device sends the unscrambled broadcast message to the satellite terminal, and the broadcast information is the MIB information as an example,
  • the broadcast information is the MIB information as an example,
  • the embodiment of the present invention unlike the LTE system/LTE-A system, multiple cells formed by multiple Beams of the same satellite have the same propagation distance to the satellite terminal.
  • each cell scrambles the respective MIB information according to the scrambling code of the local cell, that is, each cell can perform scrambling according to a unified basic scrambling code or not to scramble the MIB information; based on this, the satellite access point device can The broadcast information scrambled according to the basic scrambling code or the unscrambled broadcast information is transmitted to the satellite terminal.
  • the satellite access point device For a plurality of cells formed by multiple Beams of the same satellite, the satellite access point device transmits the same broadcast information to the satellite terminals in the plurality of cells, and broadcasts the broadcast information to the satellite terminals in the plurality of cells. Both are scrambled according to the basic scrambling code; or, for multiple cells formed by multiple Beams of the same satellite, the satellite access point device transmits the same broadcast information to the satellite terminals in multiple cells, and is directed to multiple cells. The broadcast information transmitted by the satellite terminal is not scrambled.
  • each cell does not need to scramble the respective MIB information according to the scrambling code of the local cell, that is, each cell can follow the unified basic scrambling code.
  • the satellite access point device can transmit the same broadcast information to satellite terminals in multiple cells, and
  • the broadcast information transmitted to the satellite terminals in the plurality of cells may be scrambled according to the basic scrambling code or neither scrambled.
  • the satellite access point device may send the broadcast information to the satellite terminal through the PBCH channel.
  • the existing PBCH channel when the existing PBCH channel is transmitted, it needs to be scrambled by different cell codes. Therefore, even if different satellites of the satellite transmit the same MIB content, they will become different contents after scrambling; For the satellite terminal, the PBCH channel of the neighboring cell will cause certain interference to the cell, that is, the interference between the cells of the satellite mobile communication system is very serious, and the same-frequency networking mode of the PBCH channel cannot be supported.
  • multiple cells formed by multiple Beams of the same satellite have the same propagation distance to the satellite terminal.
  • each cell does not need to follow the respective MIB information.
  • the scrambling code of the cell is scrambled, that is, each cell can perform scrambling according to a unified basic scrambling code or not to scramble the MIB information; based on this, multiple cells formed by multiple Beams of the same satellite, satellite access
  • the point device may transmit the same broadcast information to the satellite terminals in the plurality of cells, and the broadcast information transmitted to the satellite terminals in the plurality of cells may be scrambled according to the basic scrambling code or not scrambled; thus, the satellite
  • the PBCH channel obtained by the terminal is each cell Synchronous superposition of signals, rather than mutual interference, satellite terminals within the entire satellite coverage
  • the PBCH channel can be well demodulated, and the broadcast channel capable of supporting multiple cells of the same satellite does not constitute interference, which ensures the PBCH co-frequency networking of the broadcast channel and can meet the requirements of the satellite mobile communication system.
  • the satellite access point device sends the same broadcast information to the satellite terminals in the multiple cells, and further includes: the satellite access point device separately sends the same broadcast to the satellite terminals in each of the plurality of cells. Information; or, the satellite access point device simultaneously transmits broadcast information to satellite terminals in each of the plurality of cells through beams within the satellite coverage.
  • the broadcast information is transmitted to the satellite terminal through the PBCH channel, and the PBCH channel can be transmitted to the satellite terminal in each of the plurality of cells by using the unified large beam transmission within the satellite coverage on the corresponding time frequency resource. Broadcast information.
  • the embodiment of the present invention further provides a broadcast information transmission device based on a satellite mobile communication system.
  • the device includes:
  • the obtaining module 11 is configured to obtain broadcast information, where the broadcast information carries satellite orbit position information and/or absolute time value information of a current frame;
  • the sending module 12 is configured to send the broadcast information to a satellite terminal.
  • the sending module 12 is specifically configured to send the same broadcast information to the satellite terminals in the multiple cells for multiple cells formed by multiple beam beams of the same satellite.
  • the sending module 12 is specifically configured to send the basic scrambling code to the satellite terminal. Performing scrambled broadcast information; or transmitting unscrambled broadcast information to the satellite terminal.
  • the sending module 12 is specifically configured to send, by using a plurality of cells formed by multiple Beams of the same satellite, the same broadcast information to the satellite terminals in the multiple cells, and to the satellites in the multiple cells.
  • the broadcast information sent by the terminal is scrambled according to the basic scrambling code; or, for multiple cells formed by multiple Beams of the same satellite, the same broadcast information is sent to the satellite terminals in the multiple cells, and the opposite direction
  • the broadcast information transmitted by the satellite terminals in the plurality of cells is not scrambled.
  • the sending module 12 is further configured to separately send the same broadcast information to the satellite terminals in each of the multiple cells; or simultaneously transmit the beams in the satellite coverage to each of the multiple cells.
  • the satellite terminal within it transmits broadcast information.
  • the broadcast information is specifically a main information block MIB information.
  • the sending module 12 is further configured to send the broadcast information to the satellite terminal through a physical broadcast channel PBCH channel.
  • the satellite orbit position information includes one or any combination of the following: type information of the satellite; altitude information of the satellite from the ground; angle information of the satellite.
  • the satellite orbit position information further includes: attitude information of the satellite and antenna direction information of the satellite.
  • the absolute time value information of the current frame includes: modulo the absolute time value of the current frame to the synchronous transmission period.
  • the absolute time value of the current frame needs to be accurate to the us level.
  • the broadcast information is specifically broadcast information that does not include a physical hybrid automatic retransmission indication channel PHICH configuration, and the broadcast information further includes a system band. Wide information and frame number information of the cell.
  • modules of the device of the present invention may be integrated or integrated.
  • the above modules can be combined into one module, or can be further split into multiple sub-modules.
  • the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way.
  • the present invention is embodied in the form of a computer software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the present invention.
  • a computer device which may be a personal computer, server, or network device, etc.
  • modules in the apparatus in the embodiment may be distributed in the apparatus of the embodiment according to the description of the embodiment, or may be correspondingly changed in one or more apparatuses different from the embodiment.
  • the modules of the above embodiments may be combined into one module, or may be further split into multiple sub-modules.

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un dispositif permettant de transmettre des informations de diffusion sur la base d'un système de communication mobile par satellite. Le procédé comprend les étapes suivantes : un dispositif à point d'accès par satellite obtient les informations de diffusion qui portent les informations d'emplacement de l'orbite satellitaire et/ou les informations de valeur temporelle absolue de la trame en cours ; et ledit dispositif à point d'accès par satellite transmet lesdites informations de diffusion vers un terminal de satellites. Dans les modes de réalisation de la présente invention, le dispositif à point d'accès par satellite peut transmettre les informations d'emplacement de l'orbite satellitaire et/ou les informations de valeur temporelle absolue de la trame en cours, portées par les informations de diffusion, vers le terminal de satellites ; et en outre, après la réception des informations d'emplacement de l'orbite satellitaire et/ou des informations de valeur temporelle absolue de la trame en cours, le terminal de satellites peut déterminer l'emplacement géographique concret du satellite par l'utilisation des informations d'emplacement de l'orbite satellitaire et/ou des informations de valeur temporelle absolue de la trame en cours, et de ce fait calculer l'avance temporelle en fonction des informations d'emplacement du terminal de satellites lui-même et de l'emplacement géographique concret du satellite et envoyer un signal corrélatif au satellite plus rapidement en fonction de l'avance temporelle.
PCT/CN2013/073016 2012-04-28 2013-03-21 Procédé et dispositif permettant de transmettre des informations de diffusion sur la base d'un système de communication mobile par satellite WO2013159618A1 (fr)

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CN201210129859.3A CN103379435B (zh) 2012-04-28 2012-04-28 一种基于卫星移动通信系统的广播信息传输方法和设备
CN201210129859.3 2012-04-28

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WO2018039942A1 (fr) * 2016-08-30 2018-03-08 华为技术有限公司 Procédé de transmission d'informations, station de base et équipement utilisateur
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CN111464234B (zh) * 2020-06-10 2021-08-24 网络通信与安全紫金山实验室 基于多星协作的低轨卫星通信性能增强方法及系统
US20230239039A1 (en) * 2020-06-19 2023-07-27 Beijing Xiaomi Mobile Software Co., Ltd. Method for accessing satellite, and communication device
CN114765850A (zh) * 2021-01-15 2022-07-19 中国移动通信有限公司研究院 Ta的确定方法、装置、相关设备及存储介质
CN112787712B (zh) * 2021-03-29 2023-03-17 中国电子科技集团公司第七研究所 面向低轨道卫星基站-飞行器用户终端的通信连接建立方法
CN113038618B (zh) * 2021-05-20 2021-09-14 银河航天(北京)网络技术有限公司 卫星通信系统及卫星通信系统接入的方法
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