1Runcom Technologies Ltd. Submission Eli Sofer, Runcom January 2006 Doc.: IEEE802.22-06-0001r1 Slide...
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Transcript of 1Runcom Technologies Ltd. Submission Eli Sofer, Runcom January 2006 Doc.: IEEE802.22-06-0001r1 Slide...
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1Runcom Technologies Ltd.Submission Eli Sofer, Runcom
January 2006 Doc.: IEEE802.22-06-0001r1
Slide 1
Deployment of OFDMA Based Solution in 8023.22 ScenarioIEEE P802.22 Wireless RANs Date: 2006-01-11
Name Company Address Phone email Eli Sofer Runcom 2 Hachoma St., 75655
Rishon Lezion, Israel +972 3 9528440 [email protected]
Yossi Segal Runcom 2, Hachoma St. 75655 Rishon Lezion, Israel
+972 3 952 8440 [email protected]
Yigal Leiba Runcom , Hachoma St. 75655 Rishon Lezion, Israel
+972 3 952 8440 [email protected]
Notice: This document has been prepared to assist IEEE 802.22. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.
Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.22.
Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures http://standards.ieee.org/guides/bylaws/sb-bylaws.pdf including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair Carl R. Stevenson as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.22 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at [email protected].>
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2Runcom Technologies Ltd.Submission Eli Sofer, Runcom
January 2006 Doc.: IEEE802.22-06-0001r1
Slide 2
Abstract
This contribution provides an example of WRAN deployment in a real rural area. Its purpose is mainly to demonstrate the capability of OFDMA, as a WRAN solution, in a large area, which has diverse geographical features. Additionally, we analyze in the contribution the effect of the synchronization and coordination on the frequency plans, and the ability to re-use the available frequencies as much as possible.
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3Runcom Technologies Ltd.Submission Eli Sofer, Runcom
January 2006 Doc.: IEEE802.22-06-0001r1
Slide 3
Deployment of OFDMA Based Solution in 802.22 Scenario
Eli Sofer
Runcom Technologies Ltd
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4Runcom Technologies Ltd.Submission Eli Sofer, Runcom
January 2006 Doc.: IEEE802.22-06-0001r1
Slide 4
Contents
• Deployment Scenario• Coverage• Capacity• Carrier to Interference Ratio in different
configurations
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5Runcom Technologies Ltd.Submission Eli Sofer, Runcom
January 2006 Doc.: IEEE802.22-06-0001r1
Slide 5
The Terrain
Area chosen for the analysis is a 50km x 50km which include valleys and mountainous areas
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6Runcom Technologies Ltd.Submission Eli Sofer, Runcom
January 2006 Doc.: IEEE802.22-06-0001r1
Slide 6
Assuming an average population spread of 1.25 persons/sq. km
With 20% penetration ,there are 625 users in the area.
Assuming population density is not uniform, 5 regions were defined according to the geographicalfeatures of the terrain. Different density was assigned to each
All the user`s links are 1.5Mbps peak data rate. It is assumed that a user uses the link about 10% of the time, and the ratio between the peak rate and the average rate during a session is 5
User Density
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7Runcom Technologies Ltd.Submission Eli Sofer, Runcom
January 2006 Doc.: IEEE802.22-06-0001r1
Slide 7
•
Number of users in each area
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8Runcom Technologies Ltd.Submission Eli Sofer, Runcom
January 2006 Doc.: IEEE802.22-06-0001r1
Slide 8
Parameter Value Center frequency 470 MHz Channel Bandwidth 6 MHz Number of sub-channels 32 Transmission power – BS* 24.2 dBm Transmission power – CPE* 35.5 dBm Receiver noise figure 5 dB Guard interval 1/4 Ts
Main System Parameters
Sample of the possible combinations
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9Runcom Technologies Ltd.Submission Eli Sofer, Runcom
January 2006 Doc.: IEEE802.22-06-0001r1
Slide 9
Modulation
Code Rate
Number of sub-
channels
Required CINR*
Sensitivity
Net Throughput
QPSK 1/2 1 -10 dB -111 dBm 125 kbps QPSK 1/2 4 -4 dB -95 dBm 500 kbps QPSK 1/2 12 2 dB -91 dBm 1.5 Mbps
16QAM 1/2 12 8 dB -85 dBm 3 Mbps 64QAM 1/2 20 14 dB -81 dBm 10 Mbps 64QAM 3/4 32 19 dB -76 dBm 18 Mbps
The system used adaptive modulation. Due to sub-channelization, the system is capable of operating over a large dynamic range of C/I levels and signal strength
The CINR refers to the CINR of a full channel, While interference and noise are reduced with sub-channelization, the wanted carrier level is concentrated in the elected sub-Channel and hence provide better CNIR and sensitivity
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10Runcom Technologies Ltd.Submission Eli Sofer, Runcom
January 2006 Doc.: IEEE802.22-06-0001r1
Slide 10
•
Base Station Antenna Pattern
Commercial antenna of 15 dBi gain in the operating frequency
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11Runcom Technologies Ltd.Submission Eli Sofer, Runcom
January 2006 Doc.: IEEE802.22-06-0001r1
Slide 11
“ Multiple Knife-edge Model is used since the model specified
in the Channel Model Document does not take into account the
information provided by a digital terrain map.
For fade margin, Rice statistics with 99% time availability is used. The Ricean K-factor is K=0 for NLOS propagation and k=10 otherwise.
Propagation Model
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12Runcom Technologies Ltd.Submission Eli Sofer, Runcom
January 2006 Doc.: IEEE802.22-06-0001r1
Slide 12
•
Site Location
In order to achieve coverage, 11 Base Stations are needed. The sites were selected out of a list of 392 high points in the area. The sites are indicated by blue dot on the map.
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13Runcom Technologies Ltd.Submission Eli Sofer, Runcom
January 2006 Doc.: IEEE802.22-06-0001r1
Slide 13
Coverage map-Downlink
The Received Signal Strength, including fade margins are depicted in the coverage map. Various signal levels are shown in colors. The red color indicates a received signal indicates a received signal strength below –111 dBm
Site location provide approximately 95% area coverage
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14Runcom Technologies Ltd.Submission Eli Sofer, Runcom
January 2006 Doc.: IEEE802.22-06-0001r1
Slide 14
•
Coverage map- Uplink
Only 1.98% of the area is covered below the minimal level, the “red zone”
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15Runcom Technologies Ltd.Submission Eli Sofer, Runcom
January 2006 Doc.: IEEE802.22-06-0001r1
Slide 15
Capacity
Capacity in Mbps, carried by each sector, according to the areas associated with it. Maximum capacity required by a sector is of 1.2Mbps in average (10 sub-channels in QPSK, code rate ½.
For Peak data rate of 1.5Mbps, 122 sub-channels are needed with QPSK 1/2
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16Runcom Technologies Ltd.Submission Eli Sofer, Runcom
January 2006 Doc.: IEEE802.22-06-0001r1
Slide 16
•
Coordinated Synchronous Configuration
Partial usage of sub-channels (PUSC) deployment is chosen. Each sector is accommodated with 10 sub-channels. This implies a target level of CINR of 1.45 dB compared to the 0.4 dB CINR required for 12 sub-channels with QPSK ½
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17Runcom Technologies Ltd.Submission Eli Sofer, Runcom
January 2006 Doc.: IEEE802.22-06-0001r1
Slide 17
•
Synchronous Configuration
Each sector uses a different permutation base. As a result, all the sub-channels (including the “c—channel”) introduce the same level of interference, approximated as a single sub carrier coinciding between any two sub-channels.
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18Runcom Technologies Ltd.Submission Eli Sofer, Runcom
January 2006 Doc.: IEEE802.22-06-0001r1
Slide 18
Asynchronous Configuration
• Time frames between Base Stations are not synchronized, hence in TDD mode , CPE to CPE as well as Base Station to Base Station interference can be experienced in addition to the interference analyzed in the previous configurations.
• Inferior performance should be expected in this scenario
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19Runcom Technologies Ltd.Submission Eli Sofer, Runcom
January 2006 Doc.: IEEE802.22-06-0001r1
Slide 19
Low Interference Configuration
Macro Diversity
Path1
Path2
Low Power Transmission Less than 1W
BS1 p-t-mp
BS2
BS3
Array of three separate antennas
Area 1
Area 2
HO