LTE
LTE .2.5. EPC (Evolved Packet Core) (.2.5) S-GW (Serving Gateway), P-GW (Packet Data Network Gateway), Mobility Management MME (Mobility Management Entity), S-GW eNodeB . . 2.5 , . : MME PCRF (Policy and Charging Resource Function). MME HSS (Home Subscribe Server), HLR GERAN/UMTS.
UE eNB OFDMA. EPC IP; 3GPP, WiMAX Wi-Fi. All-IP Network (AIPN). , , , , MIMO. LTE (Long Term Evolution).
eNB LTE. eNB 3- :
- ,
- ,
- S-GW,
- ,
- ,
- MME ,
- IP-,
- ,
- Iuant.
.2.5. LTE
S1, .2.5, S-GW . , eNB S-GW (.1.5).
X2 , . 2 , .. eNB.
S-GW :
- ,
- (QoS) ,
- UE, Idle Mode,
- .
S-GW , . UE S-GW, . UE ; S-GW.
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P-GW IP-. P-GW . IP-, P-GW . , IP-, P-GW DHCP (Dynamic Host Configuration Protocol) DHCP, IP- . P-GW PCEF (Policy and Charging Enforcement Function), SGi . P-GW , . P-GW S-GW , . S5 GPRS Proxy Mobile IPv6. P-GW S-GW (, ), S5 S8.
Mobility Management: UE S-GW, P-GW. HSS S6a. S10, , UE , .
Policy and Charging Resource Function (PCRF) , , . , PCRF. PCEF P-GW , .
( ) E-UTRA OFDM 4-, 16- 64-. 20 1200.
.3.1. 20 15360×Ts = 0,5, 0 19. 1 10 , 0 9 (.3.2).
.3.1.
.3.2.
- E-UTRA. ∆F = 15 OFDM- 1/∆F ≈ 66,7 . ( 0,5) 6 7 OFDM- (cyclic prefix) ‒ . TCP 160s ≈5,2 144s ≈4,7 . 512 s ≈16,7. 6 OFDM- (.3.4).
.3.4.
(). 12 , 180 , (7 6 OFDM- 0,5 ). OFDM- (); 2 {k,l}, k , l ‒ . , eNB UE, 12×7 = 84 (reference) (.3.5). .
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.3.5.
- . . 4- . . .3.6. , R0, 0, R1 1, R2 2, R3 3. ( ) - . 3.3.
3.3
1 . | 4,76 | 5,56 |
2 . | 9,52 | 11,11 |
4 . | 14,29 | 15,87 |
.3.6.
- . . 3,13.
3.13
CQI | R ( ) | - | , / | |||
50 | 100 | |||||
4- | 0,08 | 0,95 | 1,91 | |||
4- | 0,12 | 1,46 | 2,94 | |||
4- | 0,19 | 2,35 | 4,73 | |||
4- | 0,3 | 3,75 | 7,54 | |||
4- | 0,44 | 5,47 | ||||
4- | 0,59 | 7,34 | 14,74 | |||
16- | 0,37 | 9,21 | 18,52 | |||
16- | 0,48 | 11,94 | ||||
16- | 0,6 | 15,02 | 30,17 | |||
64- | 0,46 | 17,04 | 34,24 | |||
64- | 0,55 | 20,73 | 41,66 | |||
64- | 0,65 | 24,35 | 48,94 | |||
64- | 0,75 | 28,23 | 56,72 | |||
64- | 0,85 | 31,92 | 64,15 | |||
64- | 0,93 | 34,66 | 69,66 |