Đánh giá hiệu năng của một số thuật toán lập lịch trên đường downlink trong mạng LTE








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


TRƢƠ
̀
NG ĐA
̣
I HO
̣
C CÔNG NGHÊ
̣

===============



CAO THIÊ
̣
N THĂ
́
NG

ĐA
́
NH GIA
́
HIÊ
̣
U NĂNG CU
̉
A MÔ
̣
T SÔ
́

THUÂ
̣
T TOA
́
N LÂ
̣
P LI
̣
CH TRÊN ĐƢƠ
̀
NG
DOWNLINK TRONG MA
̣
NG LTE

LUÂ
̣
N VĂN THA
̣
C SĨ CÔNG NGHÊ
̣
ĐIÊ
̣
N TƢ
̉
- VIÊ
̃
N THÔNG





H NI - 2013












TRƢƠ
̀
NG ĐA
̣
I HO
̣
C CÔNG NGHÊ
̣

===============


CAO THIÊ
̣
N THĂ
́
NG


ĐA
́
NH GIA
́
HIÊ
̣
U NĂNG CU
̉

A MÔ
̣
T SÔ
́

THUÂ
̣
T TOA
́
N LÂ
̣
P LI
̣
CH TRÊN ĐƢƠ
̀
NG
DOWNLINK TRONG MA
̣
NG LTE


 n T - Vig


: K thun t
: 60 52 02 03


LUÂ
̣

N VĂN THA
̣
C SĨ CÔNG NGHÊ
̣
ĐIÊ
̣
N TƢ
̉
- VIÊ
̃
N THÔNG



Ngƣời hƣớng dẫn khoa học: TS. NGUYÊ
̃
N NAM HOA
̀
NG


H NI - 2013
1

LƠ
̀
I CAM ĐOAN





 

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




  
.
 





, 02 12 
TÁC GIẢ


CAO THIỆN THẮNG

2

LƠ
̀
I CA
̉
M ƠN

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, 
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, 
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, 
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  TS. 
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

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, 
- V
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 , 
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 , 
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.
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
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

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
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
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 , 

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 

, 










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
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

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
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
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
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.
Em x



.

, 02 12 
HỌC VIÊN


CAO THIỆN THẮNG





3

DANH MU
̣
C KY
́
HIÊ
̣
U VA
̀
TƢ
̀
VIÊ
́
T TĂ
́
T

3GPP
Third Generation Partnership Project

ACK
Acknowledge
AMC
Adaptive modulation and coding
BLER
Block Error Ratio
BS
Base Station
eNodeB
Base Station (LTE)
CLSM
Closed Loop Spatial Multiplexing
CP
Cyclic Prefix
CQI
Channel Quality Indicator
CRC
Cyclic Redundancy Check
DwPTS
Downlink Pilot Time Slot
EDCF
Empirical Cumulative Distribution Function
EUL
Enhanced Uplink
FDD
Frequency Division Duplex
GP
Guard Period
H-ARQ
Hybrid Automatic Retransmission Request

HSDPA
High Speed Downlink Packet Access
LA
Link Adaptive
LTE
Long Term Evolution
MIMO
Multiple Input Multiple Output
MME
Mobile Management Entity
MS
Mobile Station
NACK
Not Acknowledge
OFDM
Orthogonal Frequency Division Multiplexing
OFDMA
Orthogonal Frequency Division Multiplex Access
OLSM
Open Loop Spatial Multiplexing
4

OPP
Object Oriented Programming
PBCH
Physical Broadcast Channel
PCFICH
Physical Control Format Indicator Channel
PDCCH
Physical Downlink Control Channel

PDSCH
Physical Downlink Shared Channel
PHICH
Physical Hybrid-ARQ Indicator Channel
PMCH
Physical Multicast Channel
QAM
Quadrature Amplitude Modulation
QoS
Quality of Service
QPSK
Quadrature Phase-Shift Keying
RB
Resource Block
RE
Resource Element
RR
Round Robin
SC-FDMA
Single Carrier Frequency Division Multiple Access
SISO
Single Input Single Output
TB
Transport Block
TDD
Time Division Duplex
TTI
Transmission Time Interval
UE
User Equipment

UMTS
Universal Mobile Telecommunications System
UpPTS
Uplink Pilot Time Slot
WCDMA
Wideband Code Division Multiple Access



5

MC LC
LƠ
̀
I CAM ĐOAN 0
LƠ
̀
I CA
̉
M ƠN 2
DANH MU
̣
C KY
́
HIÊ
̣
U VA
̀
TƢ
̀

VIT TẮT 3
MC LC 5
DANH MC BẢNG 7
DANH MC HÌNH ẢNH 8
LƠ
̀
I MƠ
̉
ĐÂ
̀
U 10
 TỔNG QUAN VỀ MẠNG LTE 12
1.1. Mt s a mng LTE 12
1.1.1. T d linh 12
 tr 13
 13
1.1.4. Kh ng 13
1.1.5. S linh hot c tn s 13
 14
1.2. Tng quan v ng downlink LTE 14
p OFDMA 14
1.2.2. Ki 15
 17
 21
: THUẬT TOÁN LẬP LỊCH TRONG MẠNG LTE 23
2.1.Thu 27
2.2. Thu th chng kn tt nht 28
2.3. Thung 30
: KÊ
́

T QUA
̉
MÔ PHO
̉
NG 32
ng LTE System Level Simulator 32
ch bt qu ng 35
6

p lch s dng chung
c 36
3.2.2.









 44
3.2.3.



 45
3.2.4.








/cell 47
 50
KÊ
́
T LUÂ
̣
N 52
TI LIỆU THAM KHẢO 53














7

DANH MC BẢNG

1.1.  17
 25
 37
 41
 45
C 45
  49
 51
8

DANH MU
̣
C HI
̀
NH A
̉
NH

1.1.  15
1.2. C 16
1.3. Frame loi 2 16
1.4. ng xung LTE 17
1.5. u tham chiu downlink LTE s dng tin t lp normal 19
1.6. ng downlink LTE 20
1.7. T chng downlink 21
1.8.  21
1.9. ng downlink LTE 22
2.1. n LA 24
2.2.  gi  25

2.3. Nhng chp 2 cho vic lp lng, ng
 26
2.4. Thu 27
2.5.  thu 28
2.6. Thu 29
2.7.  thu 30
2.8.  thu 31
3.1.  



= 10% 37
3.2.  



= 10% 38
3.3.  

p lch bng thu 38
3.4. p lch bng thu 39
3.5. p lch bng thut CQI . 40
3.6. p lch bng thu 41
3.7.  42
3.8. 










,  42
9

3.9.   

 _speed = 0.1km/h, PF
scheduler 44
    

 _speed = 100km/h, PF
scheduler 44
3.11.  46
3.12.  46
 



5 UEs/cells, PF Scheduler 47
3.14.  



50UEs/cell, PF Scheduler 48
3.15. i 5 UEs/cel, PF Scheduler 48
3.16. i 50UEs/cell, PF Scheduler 49
3.17.   


 = 1.4Mhz, PF
scheduler 50
    

 = 10Mhz, PF
scheduler 50
10

LƠ
̀
I MƠ
̉
ĐÂ
̀
U

 
 
t
        ts     
I



   

 MIMO,  
 
 

 
      1       

 
     N       
 [3]   so

        trong  
LTE.







 , 

 






 



 , 

. , 





 
 Đánh giá hiệu năng của một số thuật toán lập lịch trên đƣờng
downlink trong mạng LTE
             
[1][2][4][5]

lSIS
11

 

   v        



 3 .    
 LTE.   ch
   .  
 
 .  
ra k trong    


12

1
TỔNG QUAN VỀ MẠNG LTE





 

 

 3
































2


3

. 
























 . 3


 





















 , , 



 , 







, 












LTE  
d Sau
  
 
 

LTE.
1.1. Một số đặc trƣng của mạng LTE
1.1.1.  
LTE 
 
  
- Downlink: 2 antenna thu 
- Uplink: 1 antenna  

     ng
20Mhz (5bps/Hz)          
.
13

1.1.2. 
 

. 


 

- 
  Streaming Video
.
1.1.3. dng
LTE cao
               
3 - 4 HSDPA
t EUL. 
.
1.1.4. 
 
 

1.1.5. 
; 1,6Mhz; 2,5MHz; 5
Mhz; 10Mhz; 15Mhz; 20Mhz  .  




 
 
              

14

  
gian TDD.   . 
 2 


   trong khi


1.1.6. 

 

 
 
, 

1.2. Tổng quan về đƣờng downlink LTE
               

 MS OFDMA 

 


1.2.1.   OFDMA
  
mang 
               

        
mang con OFDM th 
 
15

 OFDMA 
         (symbols)  
gian(subcarriers)             


1.1.
1.2.2. 

         







 .Trong
  frame 



15kHz1.2.
x 1 subcarrier
(frequency)  
 1   (RB) 1 timeslot x 12
subcarriers.  
,  
OFDM 
 
16



1.2.C [6]


FDD trong
rD.
Frame l 
            
lot (DwPTS),
Guard Period (GP) ilot Time Slot (UpPTS)

 
. 


.  1.3.

1.3.Frame loi 2

17

  
thng. 

 
.

Bng 1.1.  
 
 
 .
1.2.3.  LTE
 
  


1.4.ng xung LTE
18

                  
downlink  trong LTE.
Kênh quảng bá PBCH


Phase Shift Keying (QPSK). 

Kênh chia sẻ PDSCH

  

  OFDMA.  
QAM 
.
Kênh hoa tiêu dạng điều khiển PCFICH
  


Kênh điều khiển đƣơ
̀
ng xuô
́
ng PDCCH
PDCCH 
. 


Kênh truyê
̀
n multicast PMCH
              
              

Kênh hoa tiêu yêu câ
̀
u tƣ
̣
đô
̣
ng truyê
̀

n la
̣
i PHICH
PHICH  

19

 . 



 
-ARQ.
Tín hiệu tham chiếu Downlink Reference Signals


1.6.  

 
.

1.5.  normal
             
 

  cho UE.
Quá trình truyền trên đƣờng downlink LTE

 TB 


                Hybrid
Automatic Retransmission Request (H-ARQ) 
 
20


t
1.6). 
















 

. 









 

 TB . 1 










1 









.

1.6.ng downlink LTE
         TB    
nhau. 
 transmission diversity, 
        spatial multiplexing   
21





1.7. T chtuyng downlink
1.3. Mô hình kênh truyền đa anten MIMO

 
 thu 
ng 




1.8.MMIMO
22





 


 




 



.


1.9.ng downlink LTE











23


THUẬT TOÁN LẬP LỊCH TRONG MẠNG LTE




 n quan
, ng
trong  . 
LTE, ng. 
 

 LTE.



  
 eNodeB  
  ph  = 
k
 CQI, 
   


  

 

 eN 
 

