中国联通CSFB测试和主要流程信令
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中国联通FDD_LTE的CSFB测试和分析
一、前言
本文主要针对联通FDD-LTE网络,使用华星FLY6.0进行CSFB测试和分析;CSFB 涉及4G侧(LTE)、3G侧(WCDMA)和MSC核心网侧三方的配合。以下主要是针对测试和事件消息流程进行分析和说明。
二、CSFB测试流程
CSFB测试过程主要是主叫4G手机、被叫4G手机分别驻留LTE网络中,连接FLY6.0测试软件,进行主叫4G手机拨打被叫4G手机,主叫4G手机和被叫4G手机分别回落至WCDMA网络进行通话的过程。
CSFB测试流程主要分为测试准备、测试过程和测数据统计三个部分:
三、正常CSFB信令流程
3.1.主叫主要流程
当开机做主叫时,UE首先在FDD_LTE注册(attach),完成注册后进行拨号;
通过E_nodeB上发CSFB请求;其主要流程如下:
3.1.1开机注册(attach)
注册请求消息Attach Request(层三消息RRCConnectionRequest)由UE发出(消息属NAS层),请求中包括UE注册的小区,UE支持的加密算法和方式;联合注册的4G(TAC)和3G(LAC/RAC)及ClassMark;
Attach request
MORE: 0
LENGTH: 123
LENGTH: 123
LOG_CODE: B0ED
timeStamp: 16:20:28.016
LTE NAS EMM plain OTA outgoing msg
LOG_VERSION: 1
STD_VERSION: 9
STD_VERSION_MAJOR: 5
STD_VERSION_MINOR: 0
NAS: Attach request
Security Header Type: 0
Protocol Discriminator: 7
Message_Types: 65
NAS key set identifier
TSC: 0 - native security context
NASkeysetidentifier: 1
EPS attach type
EPS attach type value: 2 - combined EPS/IMSI attach
EPS mobile identity
Length of EPS mobile identity contents: 11
odd_even indic: 0 - even number of identity digits and also when the GUTI is used
Type of identity: 6 - GUTI
MCC: 460
MNC: 01
MMEGroupID: 9A00
MMECode: 206
M_TMSI: 9A00CC345E25
UE network capability
EEA0: 1 - supporte
128_EEA1: 1 - supported
128_EEA2: 1 - supported
EEA3: 0 - not supported
EEA4: 0 - not supported
EEA5: 0 - not supported
EEA6: 0 - not supported
EEA7: 0 - not supported
EIA0: 0 - not supported
128_EIA1: 1 - supported
128_EIA2: 1 - supported
EIA3: 0 - not supported
EIA4: 0 - not supported
EIA5: 0 - not supported
EIA6: 0 - not supported
EIA7: 0 - not supported
UEA0: 1 - supported
UEA1: 1 - supported
UEA2: 0 - not supported
UEA3: 0 - not supported
UEA4: 0 - not supported
UEA5: 0 - not supported
UEA6: 0 - not supported
UEA7: 0 - not supported
UCS2: 0 - not supported
UIA1: 1 - supported
UIA2: 0 - not supported
UIA3: 0 - not supported
UIA4: 0 - not supported
UIA5: 0 - not supported
UIA6: 0 - not supported
UIA7: 0 - not supported
ACCCSFB: 1 - supported
LPP: 0 - not supported
LCS: 0 - not supported
_1xSRVCC: 0 - not supported
NF: 1 - supported
ESM message container
Length: 38
ESM message container contents: 02,03,D0,31,27,20,80,80,21,10,01,00,00,10,81,06,00,00,00,00,83,06,00,00,00,00,00,0D, 00,00,03,00,00,0A,00,00,10,00