CR over LTE
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The document discusses using cognitive radio techniques to improve spectrum utilization between 1700-1900 MHz. It proposes using frequency division duplexing to allocate specific downlink and uplink bands between 1770-1800 MHz, 1830-1840 MHz, and 1860-1880 MHz. The document concludes that this is a potential solution and identifies new access techniques, network energy efficiency, and massive MIMO as topics for future work.
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CR over LTE
- 37. 37 1850to 1860
- 38. 1790to 1800
- 40. 40
- 41. Solution(1( 41
- 42. Holes in 1700 to 1900 MHz FDD Mode DL UL 1770to 1800 MHz ----------------------- 1770to 1785 1830to 1840 MHz  ----------------------- 1860to 1880 MHz   42
- 43. Conclusion 43
- 44. Future Work • CR with New Access Technique (OFGM( • Network Energy Efficiency • Massive MIMO 44
Editor's Notes
- #4: Mobile Operators need to solve the key challenges for future wireless access - There are lot of services --> need to more BW --> scarce spectrum problem Our target is finding a band to apply LTE then extend this band by using CR
- #30: Our target is to find holes in DCS band to apply LTE technology then extend its band by using CR To solve our problem statement
- #31: Reference power = -80 dBm to judge if this part of band is considered a hole or not --> -80dBm = DCS sensitivity and our scanned band is DCS band
- #32: Laser Meter: measuring department dimensions EME SPY : shows power level with time - it gives power spectral density (exp: mW/cm2) – shows us all technologies FSH6 : if we detect any hole probability, we can use it to get its freq
- #33: EME SPY shows us signal power level with time ,also shows us all technologies
- #34: This shows DCS DL from beginning the measuring process to the end
- #35: Received signal strength in NTI wireless department We take 2 or 3 point in each room depending on it’s area then made our measurements Max RSS is colored by the red and the min is colored by white
- #36: Etisalat has 5 MHz in DCS DL and this shows max signal power level in this 5MHz
- #37: Vodafone has 7.5MHz in DCS DL (5MHz + 2.5MHz) Max Signal power level in Vodafone DCS DL (5MHZ) part
- #38: Max power level in Vodafone DCS DL (2.5 MHz) part
- #39: This shows a hole as max power level is less than the reference level -80dBm
- #40: In (1880 to 1900MHz) band : At first measurement time, we found it as a hole In second time, we found this signal In next day we found the same problem, so we realized there is ……… send on this band
- #42: But we have to check LTE compatibility with those frequencies
- #43: After checking LTE standard we found out as follow: 1-LTE can work on the three bands except the last 15 MHz in the first band 2- First band can work only UL, second band only DL, and the third band can work DL or UL We chose first band to be UL, the last band to be DL band, and we rejected the (1830 to 1840 MHz) band to have appropriate duplex distance between first and last band