Up link rain attenuation (dB) Rain fall results in attenuation of radio waves by scattering , and by absorption , of energy from the wave. NUL = uplink EARFCN In our previous content on satellite uplink, we have discussed how the signal from the earth station is transmitted to the satellite. Hence, it is always possible to reach the UE with a scheduling command with the smaller DCI payload, which is useful when the UE is reconfigured to a different TM as this reconfiguration takes a few milliseconds and it is ambiguous exactly when the UE has changed to the new TM. The technical storage or access is necessary for the legitimate purpose of storing preferences that are not requested by the subscriber or user. 0000013004 00000 n WebExplanation- Uplink frequency range is 5.9 to 6.4 GHz. Each subframe is further divided into two equally sized slots of 0.5ms. Finally, using the information described above, summary tables were generated for each ground station location, for 0.1% outage probability, a max BER of 0.0001 at various Bit Rates were generated. LTE EARFCN Equation F downlink = F DL_Low + 0.1 (N DL - N DL_Offset) F uplink = F UL_Low + 0.1 (N UL - N UL_Offset) Where, N DL is downlink EARFCN N UL is uplink EARFCN N DL_Offset is offset used to calculate downlink EARFCN 2.4 Products of Design Reference Missions, 2.5 Project Management Tools and Documents, 4.3 Typical Requirements and Design Considerations, 4.4 General Arrangement and Design Drivers, 5.3 Typical Requirements and Design Considerations, 5.10 Electrical Power System Design Tools, 6.4 Typical Requirements and Design Considerations, 6.5 General Arrangement and Design Drivers, 6.9 Communications Analysis and Link Budget, Software Lab for Communications Creating a Link Budget, 7.4 Typical Requirements and Design Considerations, 7.5 General Arrangement and Design Drivers, Thermal Control: Demonstration and Control of a Heater Lab, 8.4 Typical Requirements and Design Considerations, ADCS Hardware Lab- Torque Coils Magnetic Field Alignment, 9.4 Typical Requirements and Design Considerations, 9.7 Avionics Reliability and Fault Tolerance, 11.3 Typical Requirements and Design Considerations, 11.5 When to Use the Design Verification Methods, the following video is a duplicate video also found in section 6.7. Whether a TDD device is equipped with a duplex filter and capable of simultaneous transmission and reception is therefore a matter of device capability. endobj Radio Solutions, Inc. was established in 1998. UMTS Downlink UARFCN = 10570 0000016785 00000 n LTE also supports half-duplex FDD at the device (illustrated in the middle of Figure3.3). Stripline Impedance calculator While implementation cost is not a significant constraint for the base stations, placing a filter in the user terminal involves higher complexity and cost. A final table of SLMs for a clear day situation was generated to show that for all proposed frequencies and data rates, the SLM is sufficient for communications. In this chapter, some of the uplink-specific aspects of frame structure are repeated to set the ground for further uplink physical layer discussions as well as physical channel mappings. For data transmission, DFT precoding is applied before OFDM modulation, leading to DFT-spread OFDM or DFTS-OFDM. Want to create or adapt books like this? The frequency of the signal during uplink and downlink is known as uplink frequency and downlink frequency respectively. EARFCN uniquely identify the LTE band and carrier frequency. 169 0 obj Up = 890.0 + (ARFCN * .2) This technology will help This contrasts with current TDD-based mobile technologies, including TD-LTE, for which there are restrictions on the downlink/uplink configurations; thus there typically exist assumptions about using the same configuration for neighboring cells and between neighboring operators. An example of a link budget in diagram form. Public Safety Use and Applications, You are here: Main > Intro to Two-Way Radio > Uplink and Downlink Offset. Duplex Technique Frequency Division Duplexing (FDD) access mode previously known as WCDMA. Since we have used the same antenna for the transmitter and the receiver, Gr = Gt = 51.4 dB. The Time Division Duplex is a duplex scheme where uplink and downlink transmissions occur at different times but may share the same frequency. Unlike 802.11ac -- which operates only in the 5 GHz band -- 802.11ax supports both 2.4 Ghz and 5 GHz wireless LAN frequencies. The resource-block definition above applies to both the downlink and uplink transmission directions. The actual data is then provided to various network components with the help of a router. Hence, in addition to blindly decoding a number of PDCCH candidates for each aggregation level, the UE shall also for each PDCCH candidate decode twice for two different information payloads, that is, a UL DCI payload and a DL DCI payload. The two major requirements of downlink frequencies are as follows: Thus, in order to fulfill the above-discussed requirements, low-frequency signals are preferred over the high-frequency signals for the downlink operation. This means that the available data rate for transporting the digitally encoded speech is 13 kbps for the basic vocoder. Also, during the downlink operation, the output power shows dependency on the downlink signal frequencies. << /Filter /FlateDecode /S 143 /O 282 /Length 255 >> The base station still uses full-duplex FDD as it simultaneously may schedule different devices in uplink and downlink; this is similar to, for example, GSM operation. However, exist some necessary requirements that must be fulfilled. The large payload DCI is monitored in the UESS. Also note that, in LTE release 10 and later, the total bandwidth of the transmitted signal can be significantly larger than 20MHz, up to 100MHz in release 10 and 640MHz in release 13, by aggregating multiple carriers, see Section 5.5.
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