某局点LA3608E业务回传测试速率低问题排查经验案例

现场使用LA3608E做业务回传测试，用PC模拟虚拟无线客户端向AC传输文件速率只有200KB/S左右。收到现场反馈后，我们立刻收集信息对问题进行排查。

现场组网：

一、确认AC AP版本

1、AC版本：

H3C Comware Platform Software
Comware Software, Version 5.20, Release 3509P55
Copyright (c) 2004-2016 Hangzhou H3C Tech. Co., Ltd. All rights reserved.
H3C WX3010E uptime is 0 week, 2 days, 19 hours, 5 minutes

H3C WX3010E with 1 RMI XLS 208 750MHz Processor
512M bytes DDR2
16M bytes Flash Memory
999M bytes CFCard Memory

2、AP版本：

H3C Comware Platform Software
Comware Software, Version 5.20, Release 0010P18
Copyright (c) 2004-2016 Hangzhou H3C Tech. Co., Ltd. All rights reserved.
H3C LA3608E uptime is 0 week, 0 day, 0 hour, 3 minutes 

AC和AP版本适配。

二、查看配置

1、AC上AP模板配置：

wlan ap znjt model LA3608E id 7
map-configuration la3608egm.txt
serial-id 219801A0J2M175000125
radio 1
service-template 10 vlan-id 10
radio enable

2、AP拨号配置：

interface Cellular-Ethernet2/0

ip address cellular-allocated

dialer enable-circular

dialer-group 1

dialer timer idle 0

dialer timer wait-carrier 15

dialer timer autodial 20

dialer number *99# autodial

配置没有问题。

三、验证配置

1、在AC上查看AP上线情况：

  ===============display wlan ap all===============
=======================================================
 Total Number of APs configured           : 2
 Total Number of configured APs connected : 1
 Total Number of auto APs connected       : 0
 Total Number of APs connected            : 1
 Maximum AP capacity                      : 12
 Remaining AP capacity                    : 11
                                  AP Profiles
 State : I = Idle,   J = Join, JA = JoinAck,   IL = ImageLoad
         C = Config, R = Run,  KU = KeyUpdate, KC = KeyCfm
         M = Master, B = Backup
--------------------------------------------------------------------------------
 AP Name                          State Model              Serial-ID
--------------------------------------------------------------------------------
 znjt1                            I     LA3608E            219801A0JNM16B000055
 znjt                             R/M   LA3608E            219801A0J2M175000125

2、在AC上查看虚拟客户端上线情况：

  ===============display wlan client===============
=======================================================
 Total Number of Clients           : 1
                              Client Information
 SSID: znjt
--------------------------------------------------------------------------------
MAC Address    User Name            APID/RID IP Address      IPv6 Address   VLAN
--------------------------------------------------------------------------------
0021-ccd1-9b93 -NA-                 7   /1   192.168.1.103   -NA-           10
--------------------------------------------------------------------------------

AP和终端注册状态正常。

四、查看拨号状态

1、查看SIM卡状态

Modem Security Information
====================
PIN Verification = Disabled
PIN Status = PIN Requirement Disabled
Number of PIN Retries Remaining = 3
Number of PUK Retries Remaining = 10
SIM Status = OK（SIM卡状态正常）

2、查看注册网络状态

Network Information
====================
Current Service Status = Service Available（运营商服务可用）
Registration Status = Registered
Current Service = Packet-switched
Current Roaming Status = Home
Current Data Bearer Technology = LTE
Network Selection Mode = Automatic
Mobile Network Name = 460 11
Mobile Country Code (MCC) = 460
Mobile Network Code (MNC) = 11
Location Area Code (LAC) = 65534
Tracking Area Code(TAC) = 256
Cell ID = 1060105

3、查看信号强度

Radio Information
====================
Technology Preference = LTE only（现场SIM卡只支持LTE网络）
Technology Selected = LTE
Configured LTE Band = 1

HDR (1xEVDO) related info
------------------
Current RSSI = No Signal
Current ECIO = -2 dBm
Current IO = -106 dBm

LTE related info
------------------
Current RSSI = -59 dBm
Current RSRQ = -8 dB
Current RSRP = -89 dBm（信号为-89dBm）
Current SNR = 21 dB
Tx Power = Invalid
Active Band = E-UTRA Operating Band 1

可以看到现场SIM卡只支持4G LTE网络，设备接入4G时需要关心的信号强度值由RSRP来描述，通常在-75dBm以上时较好，在-90dBm以下时较差。由此可以判断此时的信号强度较差导致传输速率低。

让现场换一个4G信号较好的地方测试，上传速率正常。

遇到此类问题时，从版本、配置、AP客户端状态、SIM卡状态逐一仔细排查就可以发现问题的根因，另外4G信号的强度需要关心RSRP的值。