3G Evolution. Flexible bandwidth in LTE. Outline. Chapter: Introduction. Frequency spectrum for LTE 1 (4) LTE

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Martha Carroll
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1 Chapter: 3G Evolution 20 Flexible bandwidth in LTE Vanja Plicanic Outline Introduction Frequency spectrum for LTE Flexible spectrum use Flexible channel bandwidth use RF requirements for LTE BS transmitter BS receiver UE transmitter UE receiver Department of Electrical and Information Technology Rev 3G Evolution - HSPA and LTE 1 for Mobile Broadband Rev 3G Evolution - HSPA and LTE 2 for Mobile Broadband 2 Introduction Spectrum flexibility key feature of LTE Frequency spectrum for LTE 1 (4) Allocated frequency bands in paired and unpaired spectra Deployment in various frequency spectra (paired and unpaired) Deployment in various sizes of frequency spectra Ex. WCDMA/HSPA Ex. TD-CDMA/TD-SCDMA LTE Rev 3G Evolution - HSPA and LTE 3 for Mobile Broadband Rev 3G Evolution - HSPA and LTE 4 for Mobile Broadband 4

Frequency spectrum for LTE 2(4) Frequency spectrum for LTE 3(4) Reuse of frequency spectra for GSM and IMT-2000 Additional new frequency bands - 450-470 MHz - 698-806 MHz - 2300-2400 MHz - 2500-2690

2 Frequency spectrum for LTE 2(4) Frequency spectrum for LTE 3(4) Reuse of frequency spectra for GSM and IMT-2000 Additional new frequency bands MHz MHz MHz MHz MHz Paired spectrum Wide frequency operation range 450 MHz 3600MHz Unpaired spectrum Rev 3G Evolution - HSPA and LTE 5 for Mobile Broadband Rev 3G Evolution - HSPA and LTE 6 for Mobile Broadband 6 Frequency spectrum for LTE 4(4) Flexible spectrum use 450 MHz band 3500 MHz band MHz band Flexibility achieved if following considered: Coexistence between operators in the same geographical area in the band Co-location of BS equipment between operators Coexistence with services in adjecent frequency bands and across country Release independent frequency band principle Solution in RF requirements Rev 3G Evolution - HSPA and LTE 7 for Mobile Broadband Rev 3G Evolution - HSPA and LTE 8 for Mobile Broadband 8

4 MHz and 3 MHz used Set of bandwidths frequency band dependent 2009-05-28 Rev 3G Evolution - HSPA and LTE 9 for Mobile Broadband 9 2009-05-28 Rev 3G Evolution - HSPA and LTE 10 for Mobile Broadband

3 Flexible channel bandwidth use 1(2) Flexibility achieved with scalable bandwidth Pure OFDM signal 90% of the channel bandwidth (78% for 1.4 MHz case) Flexible channel bandwidth use 2(2) Solves the problem of spectrum availability and migration into currently used spectra (GSM, CDMA2000 etc.) - Bandwidths 1.4 MHz and 3 MHz used Set of bandwidths frequency band dependent Rev 3G Evolution - HSPA and LTE 9 for Mobile Broadband Rev 3G Evolution - HSPA and LTE 10 for Mobile Broadband 10 RF requirements for LTE BS and UE requirements for transmit and receive performance Transmitter characteristics: maximum output power, output power dynamics, transmitted signal quality, unwanted emissionstranmitter intermodulation Receiver characteristics: reference sensitivity level, receiver dynamic range, Adjecent Channel Selectivity, receiver blocking, receiver intermodulation, receiver spurious emissions Flexibility in bandwidth considered Regional regulation Network signaling of RF requirements for UE Europe: ETSI, ECC, US:FCC BS transmitter requirements 1(2) Unwanted emissions: - Out-of-band (OOB) emissions - Spurious emissions Concept of operating band unwanted emissions Rev 3G Evolution - HSPA and LTE 11 for Mobile Broadband Rev 3G Evolution - HSPA and LTE 12 for Mobile Broadband 12

BS transmitter requirements 2(2) Adjacent Channel Leakage Ratio (ACLR) BS receiver requirements 1(3) Reference sensitivity How much receiver degrades the SNR of the receiver signal Defined over 25

The UMTS Long Term Evolution Receiver dynamic range To ensure high throughput when receive signal is increased due to increased interference 2009-05-28 Rev 3G Evolution - HSPA and LTE 13 for Mobile

4 BS transmitter requirements 2(2) Adjacent Channel Leakage Ratio (ACLR) BS receiver requirements 1(3) Reference sensitivity How much receiver degrades the SNR of the receiver signal Defined over 25 resource blocks (5 MHz) - For analysis of coexistence between two systems that operate on adjacent channels (OOB domain) - Unwanted emissions from components at adjacent channel (PAs) From book LTE, The UMTS Long Term Evolution Receiver dynamic range To ensure high throughput when receive signal is increased due to increased interference Rev 3G Evolution - HSPA and LTE 13 for Mobile Broadband Rev 3G Evolution - HSPA and LTE 14 for Mobile Broadband 14 BS receiver requirements 2(3) Receiver susceptibility to interfering signals BS receiver requirements 3(3) Adjacent Channel Selectivity (ACS) ICS=In-channel selectivity ACS=Adjacent channel selectivity Adjacent Channel Interference Ratio (ACIR) + Receiver intermodulation Rev 3G Evolution - HSPA and LTE 15 for Mobile Broadband Rev 3G Evolution - HSPA and LTE 16 for Mobile Broadband 16

5 UE transmitter requirements 1(2) UE power level Terminal power classes (23dBm) Maximum Power Reduction (MRP) Additional Maximum Power Reduction (A-MRP) Unwanted emission limits In-band emissions OOB emissions Spectrum Emissions Mask (SEM) ACLR Spurious emissions UE transmitter requirements 2(2) Spectrum Emissions Mask (SEM) From book LTE, The UMTS Long Term Evolution Rev 3G Evolution - HSPA and LTE 17 for Mobile Broadband Rev 3G Evolution - HSPA and LTE 18 for Mobile Broadband 18 UE receiver requirements Assumptions: 2 Rx antennas assumed, 0 dbi gain each Requirements on MRC combined signal Requirements Similar to BS but different levels Exception: no in-channel selectivity Summary Various paired & unpaired frequency bands + Flexibel transmission bandwidth due to OFDM Spectrum flexibility in LTE if considered properly in the physical layer and RF requirements Rev 3G Evolution - HSPA and LTE 19 for Mobile Broadband Rev 3G Evolution - HSPA and LTE 20 for Mobile Broadband 20

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