Low-power shared access to spectrum for mobile broadband Modelling parameters and assumptions Real Wireless Real Wireless Ltd.

Transcription

1 Low-power shared access to spectrum for mobile broadband Modelling parameters and assumptions Real Wireless 2011 Real Wireless Ltd.

2 Device parameters LTE UE Max Transmit Power dbm 23 Antenna Gain dbi 0 Units Value Source TS Also matches 3GPP R Assumption in line with 2G Liberalisation Also matches 3GPP R Antenna Height m 0.5 from floor Cable, Combiner and Connector Losses db 0 Assumption in line with 2G Liberalisation Receiver Noise Figure db 9 Assumption in line with 3GPP R Adjacent Channel Rejection Ratio db 31.5dB for 10MHz and below 28.5dB for 15MHz 25.5dB for 20MHz 3GPP TS Body loss db 0 Transmit power control Dynamic range db 64 TR Assumption in line with 2G Liberalisation for data-centric devices 2011 Real Wireless Ltd. 2

3 Device parameters Outdoor low power enodeb ` Value Units Source Max Transmit Power 24 dbm As per maximum transmit power for a local area basestation given in TS Also matches with stakeholder comments. Antenna Gain 5 dbi Assumption of a small directivity value achieved by suppressing emissions in the vertical direction, R Antenna Height 5 (default), up to 15m m Location on a lamp-post or other pole Cable, Combiner and Connector Losses 0 db Assumption in line with 2G Liberalisation for a tower-mounted device Adjacent channel rejection ratio 43.5 db TS section Assumption in line with the noise figure used for HeNBs in 3GPP R Receiver Noise Figure 8 db TS section 7.2 specifies the same receiver sensitivity for both home basestations and local area basestations so we are assuming that the noise figure for this outdoor low power enodeb (i.e. a local basestation) will be the same as the home enode B case Real Wireless Ltd. 3

4 Device parameters Home enode B Value Units Source Max Transmit Power Antenna Gain 20 for residential environment 24 for public environment and enterprise dbm 0 for residential 3 5 for public area and enterprise dbi For a residential environment assess a power range from 0-20dBm as per R and the max power limit for a home BS in TS For a public area environment assess a power range from 0-24dBm as per the max transmit power for a local BS in TS Assumption in line with 2G Liberalisation Antenna Height 2.5m from the floor m Ceiling fit or wall mount Cable, Combiner and Assumption in line with 2G Connector Losses 0 db Liberalisation Adjacent channel rejection ratio 43.5 db TS section Assumption in line with 3GPP R4- Receiver Noise Figure 8 db Real Wireless Ltd. 4

5 Device parameters Macro enode B Downtilit 6 deg Value Units Source Assumption in line with 2G Liberalisation and 2.6GHz and Radar Study From TS the maximum transmit power set is independent of bandwidth choice so the EIRP is the same for 10 and 20MHz deployments. EIRP (10 or 20MHz channel) 60 dbm Antenna height 25 m Table 2 of 3GPP R gives BS transmit power of 46dBm for macrocells and an antenna gain of 14dBi giving an EIRP of 60dBm. Assumption in line with 2G Liberalisation and 2.6GHz and Radar Study Antenna gain 14 dbi Assumption in line with 3GPP R Max att due to patterns 20 db Assumption in line with 3GPP R HPBWhor 70 deg Assumption in line with 3GPP R Adjacent channel rejection ratio 43.5 db TS section BS noise figure 5 db 3GPP R Real Wireless Ltd. 5

6 Device parameters TDD adjacent channel parameters Value Units Low-power enb transmit power 0 to 24 dbm Low-power enb antenna gain 3 dbi Bandwidth 20/10 MHz ACLR 45 db Propagation model free space path loss ACS 43. db Noise Figure 8 db 2011 Real Wireless Ltd. 6

7 Device parameters S band radar Parameters Value Unit Radar Tx power 91.2 dbm Antenna gain (main beam) 28 dbi Antenna gain (side lobe) -2 dbi HP Beamwidth 1.5 Deg ACIR 26.8 db Propagation model ITU-R P 1411 Duty cycle 1.7 µs Pulse Repetition Frequency 1 khz Radar height 12 M Radar frequency 2730 MHz 2011 Real Wireless Ltd. 7

8 Propagation Modelling Path Type a) Outdoor, relatively short range for coverage, low height (5-10m) like microcells b) Outdoor interference range (diffraction over building rooftops) Model ITU-R P.1411 for LOS situations within street canyons ITU-R P over-rooftop model (equivalent to COST 231 Walfisch-Ikegami) plus COST231 NLOS building penetration loss c) Outdoor to indoor (microcell providing indoor coverage) ITU-R P.1411 for LOS situations within street canyons plus COST 231 LOS building penetration loss (or Depth 2 penetration loss in simplified model) d) Indoor to indoor (femto coverage) For residential and shopping centre scenarios use COST 231 multi wall model with different wall spacings (4.85m for residential and 13.5m for shopping centre). For indoor office model use ITU-R P.1238 e) Indoor to outdoor interference (femto to outdoor As (c), i.e. P.1411 street canyon model, plus external interference) wall loss f) Indoor to indoor between buildings P.1411 street canyon model plus two instances of COST 231 LOS building penetration loss. Possible free space sensitivity case. g) Macro to indoor, macro to outdoor to determine Not required underlay interference assume no need to model as work with assumed macro coverage levels 2011 Real Wireless Ltd. 8