Omc931200 Bsc6900 Gsm v900r012 Dimensioning Issue1

课程名称

华为技术有限公司版权所有未经许可不得扩散

P-51

� After Abis over IP is applied, the signaling plane uses the LAPD over UDP/IP protocol stack to carry signaling and the user plane uses the PTRAU over UDP/IP protocol stack to carry speech signals

� The header length of different layer (CS Part)

� TRAU frame: speech payload, including voice and Cbit. The size of the TRAU frame varies with coding schemes.

� PTRAU header: four bytes.

� UDP header: UDP header in the IP speech packet; eight bytes.

� IP header: IP header in the IP speech packet; 20 bytes.

� MAC header: The IP speech packet is encapsulated at the data link layer. The MAC header consists of the source MAC address, destination MAC address, and type. The size of the MAC header is 14 bytes.

� MAC CRC: The check performed at the data link layer. The size of the MAC CRC is 4 bytes.

� MAC preamble and start delimiter: eight bytes in total with seven bytes of preamble and one byte of start delimiter.

� Inter-frame spacing: The spacing between MAC frames. The inter-frame spacing is 12 bytes.

� The header length of different layer (PS Part)

� RLC/MAC data blocks: The size varies with coding schemes.

� TRAU in-band control signaling: eight bytes.

� PTRAU header: four bytes.

� UDP header: UDP header in the IP packet; eight bytes.

� IP header: IP header in the IP speech packet; 20 bytes.

� MAC header: The IP speech packet is encapsulated at the data link layer. The MAC header consists of the source MAC address, destination MAC address, and type. The size of the MAC header is 14 bytes.

� MAC CRC: The check performed at the data link layer. The size of the MAC CRC is 4 bytes.

� MAC preamble and start delimiter: eight bytes in total with seven bytes of preamble and one byte of start delimiter.

� Inter-frame spacing: The spacing between MAC frames. The inter-frame spacing is 12 bytes.

课程名称


P-52

Course Name

Confidential Information of Huawei. No Spreading Without Permission

P-53

Course Name


P-54

� the size (in bytes) of the TRAU frame in different speech versions

Course Name


P-55

Speech Version Speech Rate (kbit/s) Size of TRAU Frame(Bytes)

FR 13kbps 33

HR 5.6kbps 15

EFR 12.2kbps 31

AMR 12.2kbps 33

AMR 10.2kbps 28

AMR 7.95kbps 22

AMR 7.40kbps 21

AMR 6.70kbps 19

AMR 5.9kbps 17

AMR 5.15kbps 15

AMR 4.75kbps 14

AMR(HR) 7.95kbps 22

AMR(HR) 7.40kbps 21

AMR(HR) 6.70kbps 19

AMR(HR) 5.9kbps 17

AMR(HR) 5.15kbps 15

AMR(HR) 4.75kbps 14

� Bandwidth of a single CS call

� CSVAD: ratio of wanted frames to the total frames. The activation factor relates to such factors as coding/decoding algorithm, environment, VAD, noise reduction algorithm (terminal, TC), and specific session scenario (environmental noise). The value of the activation factor ranges from 0.5 to 1. The default value is 0.5.

� 8: Each byte has eight bits.

� 50: one speech frame per 20 ms on the Um interface. Thus, 50 speech frames are transmitted each second.

� 1024: 1024 bits equal 1K bits.

� Average Abis interface bandwidth on each TCH

� The result can be obtained by multiplying the data in the corresponding two columns, and then calculating the sum of all the values.

� When the ratio of AMR of each voice version is inaccessible, if the simplified configuration is used, only the ratio of FR channels and HR channels can be used for calculation.

Course Name


P-56

� The following data marked yellow is used as examples.

� The result can be obtained by multiplying the data in the corresponding two columns, and then calculating the sum of all the values

� When the ratio of AMR of each voice version is inaccessible, if the simplified configuration is used, only the ratio of FR channels and HR channels can be used for calculation.

Course Name


P-57

Codec Ratio IP over FE/GE Frame

Len

(bit)

IP over FE/GE Tput

per unit

(kbps)

FR 70% 824 20.1

HR 30% 680 2x16.6

EFR 0% 808 19.7

AMR 0% 824 20.1

AMR 0% 784 19.1

AMR 0% 736 18.0

AMR 0% 728 17.8

AMR 0% 712 17.4

AMR 0% 696 17.0

AMR 0% 680 16.6

AMR 0% 672 16.4

AMR(HR) 0% 736 2x18.0

AMR(HR) 0% 728 2x17.8

AMR(HR) 0% 712 2x17.4

AMR(HR) 0% 696 2x17.0

AMR(HR) 0% 680 2x16.6

AMR(HR) 0% 672 2x16.4

Course Name


P-58

� The size of a single IP frame（bit）

� The size of an RLC/MAC data block varies with coding schemes.

� A TRAU inband control signaling message consists of eight bytes.

� TRAU frame header: encapsulates the PTRAU frame. It consists of four bytes.

� Abis IP over FEGE frame header = 8 x (8 + 20 + 38). It in turn covers the UDP frame header, IP frame header, and MAC frame header.

� Bandwidth of a single PS call（kbps）

� 50: 50 packet frames per second; 1024: 1,024 bits, equal to 1 kbit/s.

� PSUsage parameter the PDCH usage, which is an advanced input parameter.

� Total Abis interface bandwidth required by PDCHs（Mbps）

� Abis IP over FEGE Equivalent PDCH number for PS = TRXNoIPFEGE * CHPerTRX * MaxPDCHRatio

课程名称


P-59

� the size of RLC/MAC data blocks in different coding schemes

Course Name


P-60

Code

Scheme

Service Bit Rate in

RLC/MAC layer (kbps)

Payload in RLC/MAC layer

(bytes)

CS1 9.05 20

CS2 13.4 30

CS3 15.6 36

CS4 21.4 50

MCS1 8.8 22

MCS2 11.2 28

MCS3 14.8 37

MCS4 17.6 44

MCS5 22.4 56

MCS6 29.6 74

MCS7 44.8 112

MCS8 54.4 136

MCS9 59.2 148

� The following data marked yellow is used as examples.

Course Name


P-61

Code Scheme Ratio IP over FE/GE Frame

Len

(bit)

IP over FE/GE Tput per

unit

(kbps)

CS1 0% 784 38.3

CS2 0% 864 42.2

CS3 0% 912 44.5

CS4 0% 1024 50.0

MCS1 0% 800 39.1

MCS2 0% 848 41.4

MCS3 0% 920 44.9

MCS4 0% 976 47.7

MCS5 0% 1072 52.3

MCS6 100% 1216 59.4

MCS7 0% 1520 74.2

MCS8 0% 1712 83.6

MCS9 0% 1808 88.3

� SiteNoIPFEGE and TRXNoIPFEGE are input parameters for BSC and network configuration.

Course Name


P-62

� FEGEUsage is an advanced input parameter. The available bandwidth of one GE is: 100 x 1024 x FEGEUsage.

课程名称


P-63

课程名称


P-64

� IP bandwidth needed by a S5/5/5 site

� Bandwidth of CS Services =TCH Channel number * Bandwidth of a single CS call =3*(5*8-1-3-10)*20.1=1567.8kbps

� 1 BCCH,3 SDCCH and 10 PDCH per cell

� Bandwidth of PS Services =PDCH Channel number * Bandwidth of a single PS call =3*10*59.4=1782kbps

� Bandwidth of the LAPD link =OML link bandwidth + RSL link bandwidth=64+15*16=304kbps

� Total bandwidth of Abis over IP=（Bandwidth of CS Services + Bandwidth of PS Services + Bandwidth of the LAPD link ）/FEGEUsage=(1782+1567.8+304)/70%=5142.6 kbps

课程名称


P-65

� On the A interface, the signaling plane uses the M3UA/SCTP/IP protocol stack to carry signaling, and the user plane uses the RTP/UDP/IP protocol stack to carry speech signals

课程名称


P-66

� Size of a single IP speech frame（bit）

� TRAU frame: indicates the voice payload consisting of voice and Cbit. The value varies with coding schemes.

� A IP over FEGE frame header = 8 x (12 + 8 + 20 + 38), which includes the length of RTP, UDP, IP, or MAC frame header.

� Bandwidth occupied by a call（kbps）

� 50: 50 voice frames per second. 1024: 1,024 bits, equal to 1 Kbits.

� CSVAD indicates the voice activation factor, which is an advanced input parameter.

� Bandwidth occupied by the user plane（Mbps）

� The value of MaxACICPerBSC is obtained through the calculation of the overall capacity of the BSC.

课程名称


P-67

课程名称


P-68

� Note:

� In A IP over FEGE mode, the SS7 link resources occupied by the equivalent CICs of each A interface in busy hour are supposed to be 0.9 kbit/s.

� The value of MaxACICPerBSC is obtained through the calculation of the overall capacity of the BSC.

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P-69

课程名称


P-70

� In Gb over IP, the physical layer uses the FE/GE transmission , the sub NS layer of the NS protocol complies with the IP protocol, and the upper layer of the NS protocol complies with the BSSGP protocol

课程名称


P-71

� Note:

� GbUtiRatio indicates the average ratio of the valid data to the total bandwidth in Gb over IP mode. The value is 0.7 by default, which can be adjusted and construed as GbUtiRatio = PayloadLenGb/(PayloadLenGb + 124)

� The value of GbTputPerBSC is obtained through the calculation of the overall capacity of the BSC.

� 1% indicates the average retransmission ratio of Gb interface packets.

� PayloadLenGb is an advanced parameter.

� 124 indicates the length of a packet header when the Gb interface works in the IP transmission mode.

� GbIPUsage is an advanced parameter, Can be 0 to 1, and Huawei’s default value is 1, if Operator want more resource , Opeartor can caculated by this formula.

课程名称


P-72

课程名称


P-73

� Gb over IP Transmission Usage: 70%（The ratio of effective transmission over the Gb interface to the actual physical transmission. Factors such as the retransmission rate, peak-to-average burst flow ratio, and signaling overhead rate should be considered in the transmission usage)

� Gb Configuration Calculation (IP FE)

Gb Configuration Calculation (IP FE)

Data Throughput Demand at the application Layer of the PS Subscriber (kbit/s)

300000*300/1024=87891

IP Bearer Rate per GFPUG (Mbit/s) 128*0.7*（0.2/0.2+0.124）=55.3

IP transmission rate supported by each FE port (Mbit/s)

100*0.7*（0.2/0.2+0.124）=43.2

Rounded number of FE ports that need to be configured on the active GFPUG

87891/(43.2*1024)=1.98

Rounded number of active/standby GFPUGs that need to be configured

2*87891/(55.3*1024)=3.12

Omc931200 Bsc6900 Gsm v900r012 Dimensioning Issue1

Documents

udpip protocol

data marked

ns protocol

destination

source mac

carry speech

rlcmac data

fege frame