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Requirements for the network of the Huawei BTS 3900B

Requirements for the network of the Huawei BTS 3900B

 

Huawei picobts

Huawei BTS 3900B

  1. QoS requirements

Huawei BTS 3900B the following talbe lists the QoS requirements for the UE to UE transmission.

QoS Specification End-to-End Unidirectional + Jitter End-to-End Unidirectional Packet Loss Ratio
Recommend requirement ≤ 280 ms ≤ 0.1%
Minimum requirement ≤ 350 ms ≤ 0.1%
≤ 320 ms ≤ 0.5%

The following table lists the QoS requirements for the bearer network in Abis over IP transmission mode (between the Huawei BTS 3900B and the BSC).

QoS Specification of the Transmission Network on the Abis Interface Unidirectional Delay (ms) Jitter (ms) Packet Loss Rate
Recommended value Maximum value Recommended value Maximum value Recommended value Maximum value
Terrestrial Transmission < 15 ms < 40 ms < 8 ms < 15ms < 0.05% < 0.05%
Satellite Transmission < 280 ms < 300 ms < 20 ms < 25 ms < 0.05% < 0.1%

 

  1. Bandwidth Requirement

The following table lists the TRX bandwidths in various services.

The speech activation factor 0.5 is taken into consideration. The FP mux function is not taken into consideration.
Type of Speech Frame Speech Rate Private Network Public Network
Average Traffic of Each TRX on the DL (kbit/s) Average Traffic of Each TRX on the UL (kbit/s) Average Traffic of Each TRX on the DL (kbit/s) Average Traffic of Each TRX on the UL (kbit/s)
FR 13 kbit/s 166.0 157.9 260.1 246.3
HR 5.6 kbit/s 261.3 260.2 440.2 436.9
EFR 12.2 kbit/s 163.1 155.0 257.1 243.3
AMR 12.2 kbit/s 164.6 156.5 258.6 244.8
AMR 10.2 kbit/s 157.2 149.1 251.3 237.5
AMR 7.95 kbit/s 149.9 141.8 243.9 230.2
AMR 7.40 kbit/s 147.0 138.9 241.0 227.2
AMR 6.70 kbit/s 144.1 135.9 238.1 224.3
AMR 5.9 kbit/s 141.1 133.0 235.2 221.4
AMR 5.15 kbit/s 139.7 131.5 233.7 219.9
AMR 4.75 kbit/s 138.2 130.1 232.2 218.4
AMR (HR) 7.95 kbit/s 284.7 283.6 463.7 460.3
AMR (HR) 7.40 kbit/s 278.8 277.7 457.8 454.5
AMR (HR) 6.70 kbit/s 273.0 271.9 452.0 448.6
AMR (HR) 5.9 kbit/s 267.1 266.0 446.1 442.7
AMR (HR) 5.15 kbit/s 264.2 263.1 443.2 439.8
AMR (HR) 4.75 kbit/s 261.3 260.2 440.2 436.9

 

Assume that the usage of the transmission bandwidth is 100% and the uplink factor is 0.33. That is, the uplink bandwidth is 0.33 times of the downlink bandwidth.
Data Type Data Rate Private Network Public Network
Average Traffic of Each TRX on the DL (kbit/s) Average Traffic of Each TRX on the UL (kbit/s) Average Traffic of Each TRX on the DL (kbit/s) Average Traffic of Each TRX on the UL (kbit/s)
CS-1 8.0 kbit/s 286.9 94.7 445.5 147.0
CS-2 12.2 kbit/s 317.0 104.6 475.6 156.9
CS-3 14.4 kbit/s 330.7 109.1 489.3 161.5
CS-4 20.2 kbit/s 371.7 122.7 530.3 175.0
MCS-1 8.8 kbit/s 292.4 96.5 451.0 148.8
MCS-2 11.2 kbit/s 308.8 101.9 467.4 154.2
MCS-3 14.8 kbit/s 333.4 110.0 492.0 162.4
MCS-4 17.6 kbit/s 352.5 116.3 511.1 168.7
MCS-5 22.4 kbit/s 385.3 127.2 543.9 179.5
MCS-6 29.6 kbit/s 434.6 143.4 593.2 195.7
MCS-7 44.8 kbit/s 538.5 177.7 697.1 230.0
MCS-8 54.4 kbit/s 604.1 199.4 762.7 251.7
MCS-9 59.2 kbit/s 636.9 210.2 795.5 262.5

 

  1. Clock Synchronization

The frequency offset may occur in the oscillator clock of the Huawei BTS 3900B after a period. The frequency offset affects the handover of wireless terminals between the Huawei BTS 3900B and macro BTSs. Hence, the BTS3900 needs to correct the clock accuracy through clock synchronization. Huawei propose IP Clock Service with IEEE 1588 v2, the bandwidth of synchronizing the IP packet is 30 K for a BTS. When the QoS decreases, the bandwidth is 50 K for a BTS.

QoS requirements of IP Clock server for the transmission network

Index Description
Delay < 60 ms
Delay jitter < 20 ms
Packet loss ratio < 1%

 

  1. Security

In the case of the private network application, the transmission private network provides the security guarantee. The Huawei BTS 3900B adopts the private network IP solution of the macro BTS, that is, ESN authentication mode.

In the case of the private network application, the transmission network is untrustful, and the insecurity factors such as attack and interception may exist. The security authentication method is considered. The pre-sharing key and device ID authentication are used.

For the pre-sharing key solution, the Huawei BTS 3900Band security gateway are deployed with the same pre-sharing key. When the BTS3900B originates the request to establish the IPSec tunnel, the security gateway uses the key to authenticate the BTS3900B and determines whether the BTS is valid. In this way, the security tunnel is established. Huawei propose IKE V2 protocol support from firewall side.

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