![Page 1: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/1.jpg)
Communication and Information Systems LAB
Korea Advanced Institute of Science and Technology
BDMA-based Radio Resource Management Technology
![Page 2: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/2.jpg)
Communication and Information Systems LAB
Contents
01 Overview of BDMA system ····· 4
02 Beam-forming in BDMA system ····· 9
03 Resource allocation strategy in BDMA
system ····· 17
04 Dynamic BDMA system ····· 27
05 Conclusion ····· 38
![Page 3: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/3.jpg)
Communication and Information Systems LAB
Korea Advanced Institute of Science and Technology
Overview of BDMA system
![Page 4: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/4.jpg)
Communication and Information Systems LAB
Overview of BDMA System
4
• NTT Docomo, 삼성, ETRI에서 독자 시스템 정의 및 testbed 구축
• Throughput 증가를 위한 femto/pico cell 구조 연구
• 네트워크 구축 비용 및 backbone throughput bottleneck 문제연구
• 3GPP LTE-Advanced의 self-backhauling, self-organizing network, bandwidth aggregation
Cellular based throughput
enhancement
• Coverage 문제 해결을 위한 WLAN mesh network 표준화(IEEE 802.11s)
• WMAN 이동성 표준화 (IEEE 802.16e)• Relay, multi-hop 이용 coverage 확대 (IEEE 802.16j)• Mobile WiMAX Evolution (IEEE 802.16m)
WLAN/WMAN based
coverage/mobility
extension
무선 통신 시스템의 표준화 방향
![Page 5: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/5.jpg)
Communication and Information Systems LAB
Overview of BDMA System
5
무선 통신 시스템의 표준화 방향
![Page 6: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/6.jpg)
Communication and Information Systems LAB
Overview of BDMA System
6
4G 이동통신대비 3C (Capacity,
Cost, Cost) 의 획기적개선 및 친환경
통신
전력 소모 및간섭 등에의한 자원낭비 감소
주파수자원의
공간 재활용극대화
5G (B4G) 이동통신 시스템의 목표
KEY word
- BDMA (Beam Division Multiple
Access)-Group cooperation
![Page 7: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/7.jpg)
Communication and Information Systems LAB
Overview of BDMA System
7
빔 분할 다중 접속 (Beam Division Multiple Access) 기술 (1/2)
• 시간, 주파수, 코드, 공간 자원 외에 빔을 분할하여 사용
• SDMA와 다르게 채널 정보를 몰라도 상대 BS나 MS의 위치 정보를안다고 가정하여 적응적으로 빔을 형성하여 통신함
![Page 8: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/8.jpg)
Communication and Information Systems LAB
Overview of BDMA System
8
빔 분할 다중 접속 (Beam Division Multiple Access) 기술 (2/2)
• Beam-forming을 사용한 다중접속 방식
• BS간 backhauling 망과 BS-MS 통신 모두에 사용
• 주기적 위치 feedback을 통해 상대 BS 또는 MS의 위치 정보를안다고 가정
• 기존 이동통신 주파수 대역 뿐 아니라 고주파수 대역 (예: 28GHz, 40GHz, 60GHz)의 사용
![Page 9: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/9.jpg)
Communication and Information Systems LAB
Korea Advanced Institute of Science and Technology
Beam-forming in BDMA System
![Page 10: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/10.jpg)
Communication and Information Systems LAB
Beam-forming in BDMA System
10
( )2
3
min 12 , where 180 180mdB
A A⎡ ⎤⎛ ⎞θ⎢ ⎥θ = − − ≤ θ ≤⎜ ⎟θ⎢ ⎥⎝ ⎠⎣ ⎦
Mainlobe beamwidth Number of antenna Max. sidelobe (dB) Beamwidth (deg)
30° 7 -22.24 28.80
Antenna Pattern
• 기존 3 or 6 sector antenna- Antenna gain (IEEE 802.16j [1])
- Beam-forming antenna (by simulation result)
θ3dB: 3dB beamwidth (3 sector: 70°, 6 sector: 35°)Am: 최대 감쇠 값 (3 sector: 20dB, 6secotr: 23dB)
[1] Multi-hop Relay system evaluation methodology, IEEE 802.16j-06/013r3
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Communication and Information Systems LAB
Beam-forming in BDMA System
11
3 sector antenna 6 sector antenna
-100 -80 -60 -40 -20 0 20 40 60 80 100-25
-20
-15
-10
-5
0
Azimuth in degrees
Gai
n in
dB
-100 -80 -60 -40 -20 0 20 40 60 80 100-25
-20
-15
-10
-5
0
Azimuth in degrees
Gai
n in
dB
-100 -80 -60 -40 -20 0 20 40 60 80 100-25
-20
-15
-10
-5
0
Azimuth in degrees
Gai
n in
dB
Beam-forming antenna (Mainlobe beamwidth: 30°)
Antenna Pattern (2/2)
• Beam-forming antenna
- 안테나 특성이 좋음
- 다수의 안테나 사용
![Page 12: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/12.jpg)
Communication and Information Systems LAB
Beam-forming in BDMA System
123 sector antenna system 6 sector antenna system
기존 안테나 시스템
• 하나의 셀을 3개 혹은 6개의 섹터로 나누어 섹터 별로 하나의 안테나를 이용
![Page 13: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/13.jpg)
Communication and Information Systems LAB
Beam-forming in BDMA System
13
θ
Adaptive Sector Antenna System (1/4)
• BS가 단말의 위치에 따라 적응적으로 안테나의 방향을 설정
• 하나의 셀을 다수의 가상 섹터로 나눔
• 하나의 가상 섹터에 동시에 하나의 단말만을 서비스함
단말의 위치에 따라안테나의 방향을 변경
![Page 14: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/14.jpg)
Communication and Information Systems LAB
Beam-forming in BDMA System
14
Adaptive Sector Antenna System (2/4)
• 적응적 안테나 기술- 서비스 받는 단말의 위치에 따라 빔 방향을 적응적으로 조절하여송신 이득 개선
- 폭이 좁은 빔을 이용하여 다른 셀에 미치는 간섭 억제
![Page 15: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/15.jpg)
Communication and Information Systems LAB
Beam-forming in BDMA System
15
Adaptive Sector Antenna System (3/4)
• 적응적 빔 폭 조절- 서비스 받는 단말의 위치 및 상태에 따라 적응적으로 빔 폭을 조절
Sector 1
Sector 3
MSMS
MS
MS
MS
BS
NLOS 상태에있는 단말
이동성이빠른 단말
셀 가장자리에위치한 단말
고정 단말
Narrowbeam
Widebeam
Sector 2
장애물
![Page 16: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/16.jpg)
Communication and Information Systems LAB
Beam-forming in BDMA System
16
Adaptive Sector Antenna System (4/4)
• 주파수 자원 재사용의 극대화
- 빔 별로 주파수를 재사용하여 자원 재사용 효율 개선
• 빔 별 파워 할당 기술 적용
- Water-filling algorithm- Minimum rate 보장 algorithm- 균등 파워 할당 algorithm
![Page 17: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/17.jpg)
Communication and Information Systems LAB
Korea Advanced Institute of Science and Technology
Resource allocation strategy in BDMA system
![Page 18: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/18.jpg)
Communication and Information Systems LAB
Resource allocation strategy in BDMA system
18
![Page 19: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/19.jpg)
Communication and Information Systems LAB
Resource allocation strategy in BDMA system
• 기존 시스템과의 차이- 기존 시스템과는 달리 BDMA system에서는 beam resourceallocation 문제를 고려해야 함
Beam selection 및 beam formation 고려 필요
19
![Page 20: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/20.jpg)
Communication and Information Systems LAB
Resource allocation strategy in BDMA system
Beam selection problem (1/2)
• BS는 단말이 사용할 beam을 설정- 대략적인 beam angle 및 beam width 설정- 단말의 위치 정보 및 rotating beam 기반 CQI feedback을 사용하여최적의 beam을 찾음> 가능한 모든 angle로 beam을 전송하고 단말이 가장 높은 SINR을가진 beam을 선택함으로써 최적의 수신 beam을 찾을 수 있음
> 단말의 송신 beam도 channel reciprocity에 의해 찾을 수 있음
• 단말의 상황에 따라서 narrow beam 혹은 wide beam 사용- Wide beam: 단말의 이동 속도가 빠르고 NLOS 상황에있어서 SINR이 낮은 단말
- Narrow beam: 단말의 이동 속도가 느리고 LOS가 보장되는 단말
20
![Page 21: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/21.jpg)
Communication and Information Systems LAB
Resource allocation strategy in BDMA system
Beam selection problem (2/2)
21
![Page 22: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/22.jpg)
Communication and Information Systems LAB
Resource allocation strategy in BDMA system
Beam formation problem (1/5)• 각 beam의 power (Pm) 및 direction(θm)을 결정 (optimization)• 고려할 사항
- Side lobe of beam: 각 beam들은 side lobe를 가지고 있고 이러한side lobe가 inter-beam interference를 미침
- Beam pattern을 closed form function으로 얻기 어려우므로 G(θm)라는 generalized function으로 modeling (θm는 beam의 angle)
- 각 user에게 하나의 beam이 할당될 경우의 문제에 대해서 다룸
220 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10Number of Antenna: 17
ω/π
Mag
nitu
de (
dB)
Side lobe of beam Main lobe: signal
Side lobe: interference
![Page 23: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/23.jpg)
Communication and Information Systems LAB
Resource allocation strategy in BDMA system
Beam formation problem (2/5)
• Optimization problem (maximize sum rate)- Find Pm and θm
23
![Page 24: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/24.jpg)
Communication and Information Systems LAB
Resource allocation strategy in BDMA system
Beam formation problem (3/5)
• Beam power(Pm)와 beam direction(θm)을 한꺼번에 optimize 하기어려움
• Beam direction과 beam power를 iterative 하게 optimize optimal solution으로 converge
24
Optimizebeam
direction (θm)
Optimizebeam
power (Pm)
![Page 25: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/25.jpg)
Communication and Information Systems LAB
Resource allocation strategy in BDMA system
Beam formation problem (4/5)
• Beam direction(θm) optimization• Optimal solution(θm) can be found by using gradient method
25
Θm will converge to optimal value
Gradient
![Page 26: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/26.jpg)
Communication and Information Systems LAB
Resource allocation strategy in BDMA system
Beam formation problem (5/5)
• Beam power (Pm) optimization• Optimal solution can be found by using KKT (Karush-Kuhn-Tucker)
condition
26
MIWF case - 기존의 Modified Iterative
Water Filling solution과 동일
m-th beam이 다른 beam에미치는 interference의 영향 정도
m-th beam의Inverse SINR
n-th user의 m-th subcarrier에서의 Inverse SINR
n-th user의 m-th subcarrier 사용이다른 user들에게 미치는 영향 정도
![Page 27: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/27.jpg)
Communication and Information Systems LAB
Korea Advanced Institute of Science and Technology
Dynamic BDMA System
![Page 28: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/28.jpg)
Communication and Information Systems LAB
Dynamic BDMA System
28
BDMA system에서의mobility
Self-organizing algorithm
Dynamic환경 변화
고려
DynamicBDMASystem
![Page 29: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/29.jpg)
Communication and Information Systems LAB
Dynamic BDMA System
29
Mobility support in BDMA system (1/2)
• BDMA 시스템에서의 이동성
- 각 단말은 일정한 속도로 움직임
- 단말이 빠른 속도로 움직일 경우 위치 estimation에 오차 발생
> 단말 속도가 120km/h : 100ms에 3.33m이동
> 단말 속도가 36km/h : 100ms에 1m이동
> BDMA 시스템에서는 단말의 위치 기반 beam forming을 이용하여
data를 전송하므로 이동성이 문제가 됨
![Page 30: BDMA-based Radio Resource Management Technology · 5G (B4G) 이동통신시스템의목표 KEY word-BDMA (Beam Division Multiple Access) ... (Beam Division Multiple Access) 기술(2/2)](https://reader031.vdocuments.pub/reader031/viewer/2022022011/5b0dc6bf7f8b9a6a6b8e6e66/html5/thumbnails/30.jpg)
Communication and Information Systems LAB
Mobility support in BDMA system (2/2)
Dynamic BDMA System
Adaptive Cooperative Beam Forming
기본 아이디어: 다수의 BS를 동시에 이용하여 data를 전송하여 위치 추정
오차 및 channel 변화의 영향을 줄임
유사한 기존 방안:
Similar to Coordinated Multi Point tx/rx (CoMP)
기존 방안과의 차이: 단말의 상황 (속도)에 따라서 adaptive하게
cooperation 하는 BS수를 조절
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CoMP
CoMP에서는 다수의기지국을 동시에 사용하여
단말에게 데이터 전송
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Communication and Information Systems LAB
Dynamic BDMA System
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Pros- Reliable data
transmission 가능
- Beam forming 사용으로인한 작은 inter-cell
interference
Cons- 기지국간 cooperation
어려움(복잡도 및 sync 문제)
- 동시에 여러 BS를 사용하므로 cell throughput
감소 가능
Adaptive cooperative beam forming (1/2)
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Communication and Information Systems LAB
Dynamic BDMA System
32
Adaptive cooperative beam forming (2/2)
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Communication and Information Systems LAB
Dynamic BDMA System
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Self organizing algorithm for BDMA system (1/5)
• Self organizing algorithm의 필요성- BDMA 시스템에서의 channel 변화> BDMA 시스템에서는 channel 변화의 영향이 큼
(LOS vs. Non LOS)- 현재 통신 시스템에서 self organizing network에 대한 수요 증가
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Communication and Information Systems LAB
Dynamic BDMA System
34
Self optimization
주변 상황감지
Self organizing algorithm for BDMA system (2/5)
• Self organizing algorithm- 주변 상황 감지- Self optimization
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Communication and Information Systems LAB
Dynamic BDMA System
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Self organizing algorithm for BDMA system (3/5)• 주변 상황 감지
- Beam scanning: beam forming을 이용하여 directional하게scanning을 함> Search range 증가> Neighbor의 개수 증가> Scanning 시간 증가> 복잡도 증가
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Communication and Information Systems LAB
Dynamic BDMA System
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Omni-directional 안테나를이용하여 전방향 scanning-> 네트워크 밀도(ρ) 추정
Beamforming을 이용하여 넓은영역으로 beam scanning ->충분한 수의 neighbor를 확보
Self organizing algorithm for BDMA system (4/5)
• 주변 환경을 고려한 beam scanning- Omni-directional 안테나를 이용한 scanning으로 네트워크 밀도를추정하여 최적의 빔 폭을 결정
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Communication and Information Systems LAB
Dynamic BDMA System
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Self organizing algorithm for BDMA system (5/5)
• Self optimization- 각 BS는 독립적으로 자신의 beam direction 및 power를 update- 각 BS들은 자신의 SINR을 높이기 위해서 beam direction 및 power를주변 cell의 interference가 적은 쪽으로 설정
Similar to Iterative Water Filling
BS1
User
BS2User
BS beam direction powercell interference
BS1
User
BS2User
User User
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Communication and Information Systems LAB
Conclusions
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Resource allocation in BDMA system
• BDMA system- Beam 분할을 이용한 새로운 다중 접속 시스템
3C 문제 해결- Adaptive antenna sector system> 단말의 SINR(throughput) 증가
- Resource allocation in BDMA system> Beam selection 및 beam formation
- Dynamic BDMA system> 다수 BS의 동시 사용을 통한 mobility support> 주변 상황 감지 및 self optimization