LTE Uplink Carrier Aggregation Timing Advances
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Questions and Answers

What is the purpose of the Standing Advisory Committee on Radio Frequency Allocation (SACFA)?

  • To set up guidelines for NR channel bandwidth
  • To allocate radio frequencies for telecom towers (correct)
  • To issue clearance to aviation hazards near telecom towers
  • To regulate the maximum number of Component Carriers

    • In the context of NR, what does the term 'DL' stand for?

  • Downlink (correct)
  • Device Locator
  • Dual Link
  • Data Load

    • What is the significance of the acronym 'CA' in the context of 5G NR?

  • Central Authority
  • Control Access
  • Channel Amplification
  • Carrier Aggregation (correct)

    • What does 'FDD' represent in the LTE technology context?

    <p>Frequency Domain Duplex</p> Signup and view all the answers

    What is the primary function of the Timing Advance Group (TAG) in Long Term Evolution (LTE)?

    <p>To synchronize uplink transmissions</p> Signup and view all the answers

    What is the maximum number of Downlink (DL) Component Carriers (CCs) that can be configured in LTE Release 10?

    <p>5</p> Signup and view all the answers

    Which release introduced the concept of aggregating up to 5 Downlink (DL) CCs and 5 Uplink (UL) CCs in LTE?

    <p>Release 10</p> Signup and view all the answers

    In LTE Release 11, for TDD Carrier Aggregation (CA), what is the condition regarding downlink-uplink configurations across component carriers in the same band?

    <p>Identical configurations</p> Signup and view all the answers

    What is the maximum number of Uplink (UL) Component Carriers (CCs) that can be configured in LTE Release 10?

    <p>5</p> Signup and view all the answers

    In LTE, which release introduced the concept of Carrier Aggregation for both Frequency Division Duplexing (FDD) and Time Division Duplexing (TDD) modes?

    <p>Release 10</p> Signup and view all the answers

    What is the maximum number of configured Component Carriers supported for a UE in Release 15 for both downlink (DL) and uplink (UL)?

    <p>16 for both DL and UL</p> Signup and view all the answers

    In Release 13 LTE Advanced Pro, what is the maximum number of component carriers that can be aggregated for DL and UL?

    <p>32</p> Signup and view all the answers

    Which release introduced License-Assisted Access (LAA) where carrier aggregation can be used to aggregate downlink carriers in unlicensed frequency bands?

    <p>Release 13</p> Signup and view all the answers

    What is the maximum transmission bandwidth supported in Release 13 LTE Advanced Pro for wider transmission?

    <p>640MHz</p> Signup and view all the answers

    Which release specifies the necessary mechanisms to enable LTE carrier aggregation of up to 32 component carriers for both downlink and uplink?

    <p>Release 13</p> Signup and view all the answers

    What is the maximum percentage cap on the combined spectrum holding in 1800 MHz, 2100 MHz, 2300 MHz, and 2500 MHz bands?

    <p>40%</p> Signup and view all the answers

    Which band has a cap of 40% on the total spectrum put to auction?

    <p>3300 MHz</p> Signup and view all the answers

    What technique introduced as part of LTE Advanced from release 10 onwards allows a terminal to receive or transmit on multiple component carriers?

    <p>Carrier Aggregation</p> Signup and view all the answers

    In which frequency bands can License Assisted Access be used to aggregate downlink carriers?

    <p>5 GHz unlicensed bands only</p> Signup and view all the answers

    Which LTE/NR enhancement technique is a long successful story with new combinations of frequency bands added in every release?

    <p>Carrier Aggregation</p> Signup and view all the answers

    What is the purpose of the Spectrum Cap mentioned in the text?

    <p>To cap the combined spectrum holding in specific frequency bands</p> Signup and view all the answers

    Which bands are included in the Spectrum Cap limitation?

    <p>600 MHz, 700 MHz, 800 MHz, and 900 MHz bands</p> Signup and view all the answers

    What does WOL stand for in the context of the text?

    <p>Wideband Offline Licensing</p> Signup and view all the answers

    In the context of the text, what is the significance of a one-time application for frequency assignment?

    <p>It streamlines the process by requiring only initial submission.</p> Signup and view all the answers

    What is the main purpose of SACFA clearance in the process described in the text?

    <p>To approve the import of equipment where necessary</p> Signup and view all the answers

    What is the maximum number of configured Component Carriers that a UE with multiple timing advance capability for CA can simultaneously receive and/or transmit on?

    <p>Multiple serving cells grouped in multiple TAGs</p> Signup and view all the answers

    In the context of LTE TDD-FDD joint operation, what is the objective of the Work Item mentioned in the text?

    <p>Enhancing LTE TDD-FDD joint operation with carrier aggregation</p> Signup and view all the answers

    Which type of UE can only receive on a single CC and transmit on a single CC corresponding to one serving cell only?

    <p>A non-carrier aggregation capable UE</p> Signup and view all the answers

    In the context of LTE TDD-FDD joint operation, what does the support of inter-band carrier aggregation include?

    <p>Support for FDD DL and TDD UL across different bands</p> Signup and view all the answers

    Which release is mentioned in the text as associated with LTE TDD-FDD joint operation including Carrier Aggregation?

    <p>Release 12</p> Signup and view all the answers

    What parameters does gNB include when configuring a BWP?

    <p>BWP Numerology, BWP bandwidth size, Frequency location, CORESET</p> Signup and view all the answers

    How is the bandwidth of the BWP configured for each UE?

    <p>According to the UE's capability on supported maximum bandwidth</p> Signup and view all the answers

    What feature allows the bandwidth of the BWP to be narrower than the supported maximum bandwidth for a UE?

    <p>BWP Adaptation capability</p> Signup and view all the answers

    What is necessary to support aggregation of LTE and NR throughput due to NR not supporting carrier aggregation with LTE?

    <p>Dual Connectivity</p> Signup and view all the answers

    Which release introduced EN-DC operation to support simultaneous transmissions across LTE and NR?

    <p>Rel-15</p> Signup and view all the answers

    What is needed to support carrier aggregation with LTE due to NR not supporting it?

    <p>EN-DC Operation</p> Signup and view all the answers

    Study Notes

    Standing Advisory Committee on Radio Frequency Allocation (SACFA)

    • SACFA's purpose is to advise on the allocation of radio frequencies in India, ensuring efficient use of the spectrum.
    • It assesses requests for radio frequency allocations to avoid interference and support communication services.

    NR Terminology

    • 'DL' stands for Downlink, referring to the communication from the base station to the user equipment in New Radio (NR).
    • 'CA' means Carrier Aggregation, a technique that combines multiple frequency bands to increase data bandwidth in 5G NR.

    LTE Technologies

    • 'FDD' represents Frequency Division Duplexing, a method of transmitting and receiving data on separate frequencies in LTE.
    • The Timing Advance Group (TAG) adjusts the transmission timing of user equipment to maintain synchronization with the base station in LTE.

    Component Carrier Configurations in LTE

    • LTE Release 10 allows a maximum of 5 Downlink (DL) Component Carriers (CCs) to be configured.
    • Release 10 is the first to introduce the concept of aggregating both 5 DL and 5 Uplink (UL) CCs.
    • For LTE Release 11 TDD Carrier Aggregation, downlink-uplink configurations must be symmetrical across component carriers in the same band.
    • LTE Release 15 supports a maximum of 32 configured Component Carriers for both DL and UL.

    Further Developments in LTE

    • Release 13 LTE Advanced Pro introduced License-Assisted Access (LAA), enabling carrier aggregation of downlink carriers in unlicensed bands.
    • Maximum transmission bandwidth in Release 13 LTE Advanced Pro has been enhanced for broader data transmission.
    • The concept of Carrier Aggregation for both FDD and TDD modes was introduced in LTE Release 10.

    Spectrum Regulation

    • A cap of 33% on the combined spectrum holding applies to the bands of 1800 MHz, 2100 MHz, 2300 MHz, and 2500 MHz.
    • The band with a 40% cap on total spectrum during auctions is 2300 MHz.

    LTE Advanced Features

    • LTE Advanced introduced techniques enabling terminals to operate on multiple component carriers from Release 10 onwards.
    • License Assisted Access can aggregate downlink carriers in both licensed and unlicensed frequency bands.
    • Carrier Aggregation has been a continuous enhancement, introducing new frequency band combinations with each release.

    Spectrum Cap Purpose

    • The Spectrum Cap limits the amount of frequency spectrum a single operator can hold to promote competition and efficient usage.

    Additional Concepts

    • WOL stands for Wideband Operation and is relevant in the context of frequency usage.
    • A one-time application for frequency assignment minimizes administrative burdens and streamlines the process for operators.

    SACFA Clearance

    • SACFA clearance validates frequency assignments, aiming to ensure no interference occurs between different operators.

    UE Capabilities in LTE

    • A User Equipment (UE) with multiple timing advance capability can receive and transmit on multiple Component Carriers simultaneously.
    • A specific type of UE can only operate on a single Component Carrier attached to one serving cell.

    TDD-FDD Joint Operation

    • The support of inter-band carrier aggregation is included in LTE TDD-FDD joint operation, enhancing frequency efficiency.
    • The release associated with LTE TDD-FDD joint operation that includes Carrier Aggregation is Release 14.

    gNB Configuration

    • The gNB configures Bandwidth Part (BWP) parameters for UE, including bandwidth settings to balance performance and coverage.

    BWP Features

    • BWP allows for a narrower bandwidth than the UE's maximum capability to optimize resource usage while maintaining service quality.

    EN-DC Operation

    • EN-DC operation was introduced to facilitate simultaneous transmissions over LTE and NR, addressing aggregation needs.
    • Support for carrier aggregation with LTE is crucial as NR does not inherently support LTE's aggregation capabilities.

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    Related Documents

    Spectrum Management & Planning PDF

    Description

    Explore the concept of supporting multiple timing advances in LTE uplink carrier aggregation, including how a UE with single or multiple timing advance capability can receive and transmit on multiple component carriers. Learn about the advantages and implications of this feature.

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