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Warning appears in the DJI GO app?1. Running the DJI GO app requires lots of CPU resources, which will affect decoding efficiency. So video downlink may be delayed. To obtain better video downlink, enable the hardware decoding to reduce CPU usage. 2. Set the low battery warning its minimum value. Without the low battery warning, video downlink will not be delayed. 3. If the DJI GO app is run on an Android device with strong performance, video downlink will not be affected. The minimum delay of the video downlink will be 170ms.2. Why is video downlink corrupted when connected to WiFi, and why can YouTube Live Streaming not be used?1. The Phantom 3 and Inspire 1 use HD transmission technology that works within the 2.4G frequency band for the video downlink and signal transmission. Generally, WiFi also works at the same frequency band. Hence, they will interfere each other and transmission signal will be affected. 2. Customers are suggested to use the 4G mobile data or the 5.8G frequency band for optimal live streaming.3. Will cached videos be affected if image transmission does not work smoothly?4. Why are there black and white stripes on the video downlink?If the image is over exposed and "Over Exposure Warning" is enabled in the DJI GO app for iOS, black and white stripes will be shown on screen. Please advise the users to adjust the ISO, Shutter Speed and EV to attain proper exposure.5. Why is video downlink signal lost within a short distance (50 meters)?1. Make sure that the antennas are positioned for optimal transmission. 2. Try using a custom transmission channel. 3. If video downlink quality is set to a high value, transmission distance will be shortened. 4. If video downlink quality is set to the minimum value and the issue persists, further checking of the antennas is required.6. Why does the app’s status bar shows "No Signal" when a single remote controller is connected?If the aircraft information (e.g. battery info, RC signal, etc.) is shown in the DJI GO app while the camera's information is not, check if the gimbal camera is correctly assembled and can conduct the self-check normally.If the camera works normally, check whether there is cosmetic damage to the USB port of the remote controller and the USB cable is connected correctly. If not, try with another mobile device. If the USB cable and the mobile device work normally, try with another remote controller. If there is no another remote controller available, connect the remote controller with an HDMI display. If the HDMI monitor works normally, the USB port on the remote controller is malfunctioning. If the issue persists, the aircraft may be malfunctioning. Please send the aircraft

UMTS (Universal Mobile Telephone System), fourth-generation LTE (Long Term Evolution) and fifth-generation NR (New Radio).However, the CDMA-based 2G and 3G mobile networks use different terminologies for these communication links. In CDMA networks, IS-95 (Interim Standard 1995), CDMA2000 and EVDO (Evolution-Data Optimized), the communication link from the base station to the cell phone is called a forward traffic channel or forward channel. The communication link from the cell phone back to the base station is called a reverse channel.In summary, the downlink communication in CDMA networks (IS-95, CDMA2000 and EVDO) is called a forward traffic channel or forward channel, and the uplink communication in CDMA networks is called a reverse traffic channel or reverse channel.TechnologyNetwork-to-Phone communication Phone-to-Network communicationGSM (2G)DownlinkUplinkUMTS (3G)DownlinkUplinkHSPA (3G)DownlinkUplinkIS-95 or CDMAOne (2G)Forward Traffic ChannelReverse Traffic ChannelCDMA2000 (3G)Forward Traffic ChannelReverse Traffic ChannelEVDO (3G)Forward Traffic ChannelReverse Traffic ChannelLTE (4G)DownlinkUplinkNR (5G)DownlinkUplink— Uplink, Downlink, Forward Channel and Reverse Channel in mobile networks —The terms uplink and downlink are also used in satellite communications. The link from the satellite to the ground is called downlink, and the link from the ground to the satellite station is called uplink. To remember this concept in mobile communications, look at the picture below.As you can see, base station antennas are generally always at a higher position than a mobile phone; therefore, they need to transmit the radio signal downwards, hence the term downlink. On the other hand, a mobile phone generally always has to send the radio signal in the upward direction, hence the term uplink. Of course, this situation may change if you are in a high-rise building, but the terminologies are based on general situations for the majority of the population.The uplink and downlink separation – DuplexingThe uplink and downlink communication links are separate, but the way they are separated from each other may differ depending on the mobile cellular technology, e.g. GSM, UMTS, LTE, NR, etc. The technique used to determine this separation is called a duplexing scheme, which is a fundamental concept in mobile communications. The duplexing scheme determines whether the uplink and downlink communication shall be carried out on separate frequency bands

Uplink (UL or U/L for short) and downlink (DL or D/L for short) are two basic terminologies used in mobile communications. These are two communication links that allow the mobile phone and the mobile network to communicate with each other.Uplink is the communication link that transmits the signal from the mobile phone to the network base station (eNodeB, gNodeB, etc.). Downlink is the communication link from the base station to the phone. In CDMA networks, the downlink is called a forward channel, and the uplink is called a reverse channel.—Uplink vs Downlink communication in mobile networks—When you make a phone call using your cell phone, the phone is busy doing many things. The two most basic things the phone is doing is that it is continuously sending and receiving. The mobile network base station is also doing the same thing. What a mobile phone sends is received by the base station, and what a base station sends is received by the mobile phone.The mobile phone and the mobile network are connected to each other even when you are not on a phone call. The mobile phone is always providing its status update to the mobile network. In simple terms, it is always telling the mobile network, “I am here”.Since both the base station (cell tower) and the mobile phone (cell phone) need to communicate with each other, the communication is separated by creating two dedicated links. These links basically determine who is sending, the phone or the network. This is where uplink and downlink communication comes in.Downlink communication is when a radio network base station transmits the radio signal from its antennas to the antennas of a mobile phone or cell phone. Radio network base stations are BTS, NodeB, eNodeB, gNodeB, etc.Uplink communication is when a mobile phone or cell phone transmits the radio signal from the phone antennas to the antennas of the radio network base station (BTS, NodeB, eNodeB, gNodeB, etc.).Uplink and downlink in CDMA networksThe terms uplink and downlink are used by most mobile networks in the world, including second-generation GSM (Global System for Mobile Communications), third-generation

And superior user experience, making it the top choice among Algerian mobile operators. GSM Name Interface Description 900 MHz (E-GSM) GSM Ooredoo Algeria uses the GSM 900 MHz (E-GSM) frequency band. This band operates in the range of 880.0 – 915.0 MHz for the uplink and 925.0 – 960.0 MHz for the downlink. The deployment of this frequency band is part of the recent allocation of additional 900 MHz of mobile spectrum in the E-GSM band to Algeria's three telecom operators, which was awarded in 2023. 1800 MHz (DCS) GSM Ooredoo Algeria uses the GSM 1800 MHz (DCS) frequency band. This band operates in the range of 1710.0 – 1785.0 MHz for the uplink and 1805.0 – 1860.0 MHz for the downlink. The deployment of this frequency band is part of the recent allocation of additional 900 MHz of mobile spectrum in the E-GSM band to Algeria's three telecom operators, which was awarded in 2023. UMTS Name Interface Description B1 (2100 MHz) UMTS Ooredoo Algeria uses the UMTS frequency band B1 (2100 MHz). This band operates at 2100 MHz and is used for Universal Mobile Telecommunications System (UMTS) services. LTE Name Interface Description B1 (2100 MHz) LTE Ooredoo Algeria uses the LTE B1 (2100 MHz) frequency band. This band operates in the range of 1920-1980 MHz for the uplink and 2110-2170 MHz for the downlink. The deployment of this frequency band was added to Ooredoo Algeria on August 5, 2024. B2 (1900 MHz PCS) LTE Ooredoo Algeria uses LTE band B2 (1900 MHz PCS). This frequency band was deployed on August 5, 2024. B3 (1800 MHz +) LTE Ooredoo Algeria uses the LTE B3 (1800 MHz +) frequency band. This band operates in the range of 1805-1880 MHz for the downlink and 1710-1785 MHz for the uplink. B7 (2600 MHz)

Website.Issue A – Informing BR of a suspension under RR No.646)Īgenda Item 1.4 – Secondary Amateur High Frequency (HF) AllocationsĪgenda Item 1.5 – Unmanned Aircraft Systems (UAS)Īgenda Item 1.6.1 – Region 1 Fixed-Satellite Service (FSS) uplink/downlink at 10-17 GHzĪgenda Item 1.6.2 – Region 2&3 FSS uplink at 13-17 GHzĪgenda Item 1.7 – Mobile-Satellite Service (MSS) Feeder LinksĪgenda Item 1.8 – Earth Stations onboard Vessels (ESV)Īgenda Item 1.9.1 – FSS uplink/downlink in the 7/8 GHz rangeĪgenda Item 1.9.2 – Maritime Mobile-Satellite Service (MMSS) uplink/downlink in the 7/8 GHz rangeĪgenda Item 1.10 – MSS uplink/downlink in the 22-26 GHz rangeĪgenda Item 1.11 – Earth Exploration-Satellite Service (EESS) uplink in the 7-8 GHz rangeĪgenda Item 1.12 – EESS (active) +600 MHz in the 8-10 GHz rangeĪgenda Item 1.13 – Space Research Service (SRS) (space-to-space) at 410-420 MHzĪgenda Item 1.14 – Universal Coordinated Time (UTC)Īgenda Item 1.15 – Maritime Mobile onboard Communications at UHFĪgenda Item 1.16 – Automatic Identification System (AIS) enhancementĪgenda Item 1.17 – Wireless Avionics Intr-Communications (WAIC)Īgenda Item 1.18 – Automotive Radiolocation at 77.5-78.0 GHzĪgenda Item 2 – Incorporation By Reference (IBR) ReviewĪgenda Item 4 – Resolutions & Recommendations ReviewĪgenda Item 7 – Resolution 86 – Satellite Regulatory Procedures WRC-15 concluded on 27 November 2015Īgenda Item 1.1 – Mobile Broadband / International Mobile Telecommunications (IMT)Īgenda Item 1.2 – Region 1 Digital Dividend (IMT)Īgenda item 1.3 – Public Protection and Disaster Relief (PPDR) (Res. Note: The contents of this page should be viewed as archival. These proposals may vary from the preliminary views based on international and domestic studies and multilateral discussions.Each proposal represents the NTIA position on specific changes to the Radio Regulations for WRC agenda items. proposals based on advice from the Federal agencies.

The IS-95 mobile networks, also known as cdmaOne systems, introduced the first CDMA based mobile networks in the mid-1990s. IS-95 stands for Interim Standard 1995, and it was a second-generation mobile network technology. Interim Standard 95 (IS-95 or cdmaOne) uses two frequency bands: 824 to 894 MHz and 1850 to 1990 MHz. In the first band, 824 to 849 MHz is for reverse link and 869 to 894 MHz for the forward link. In the second band, 1850 to 1910 MHz is for reverse link and 1930 to 1990 MHz for the forward link. The IS-95 standard has two variants, IS-95 A and IS-95 B, which later evolved into the third generation mobile networks CDMA2000. For completeness, another CDMA-based mobile network is 3G UMTS which followed a different track and was used for the 3G migration of GSM networks. In this post, we will dive into the frequencies and channels used by the IS-95 systems.Frequencies used in the forward and reverse links of IS-95Frequency BandReverse Link (Uplink)Forward Link (Downlink)IS-95, first band: 824 to 894 MHz824 – 849 MHz869 – 894 MHzIS-95, second band: 1850 to 1990 MHz.1850-1910 MHz1930-1990 MHz—IS-95 (cdmaOne) forward link and reverse link frequencies—IS-95, commercially known as the cdmaOne system, uses a full-duplex scheme called Frequency Division Duplex (FDD), which means separate frequency bands for the forward and the reverse links. For clarity, in GSM, UMTS and LTE networks, we use the term downlink for communication from Base Station to Mobile Station, which is called forward link in cdmaOne (IS-95). Similarly, in GSM, UMTS and LTE, the term uplink means communication from Mobile Station to Base Sation, which is called the reverse link in cdmaOne (IS-95). There are two bands in IS-95; the 850 MHz band and the 1900 MHz band. In the 850 MHz band, the reverse link is from 824 MHz to 849 MHz, while the forward link is from 869 MHz to 894 MHz. Therefore, the separation between the starting frequencies for reverse and forward links is 45 MHz (i.e. 869 MHz minus 824MHz = 45 MHz). In the 1900 MHz band, this separation is 80 MHz, so the reverse link is from 1850 MHz to 1910 MHz, while the forward link is 1930 MHz to 1990 MHz. The table below summarises the forward and reverse link frequencies in IS-95 (cdmaOne).What channels forward and reverse links use in IS-95In IS-95 mobile networks, the forward and reverse links have a different set of channel types. The table below summarises the channels for the forward and reverse links.In Interim Standard 95 (IS-95) the forward link (network to phone) has four physical channels: pilot channel, sync channel, paging channel and forward traffic channel. The reverse link (phone to network) has two physical channels: reverse access channel and reverse traffic channel.Channel NameForward or Reverse Link?AbbreviationPilot ChannelForward Link (Downlink)F-PICHSynch ChannelForward Link (Downlink)F-SYNCHPaging ChannelForward Link (Downlink)F-PCHForward Traffic ChannelForward Link (Downlink)F-TCHReverse Access ChannelReverse Link (Uplink)R-ACHReverse Traffic ChannelReverse Link (Uplink)R-TCH—Forward and Reverse Link Physical Channels in Interim Standard 95 (IS-95 or cdmaOne)—What channel