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HUAWEI TECHNOLOGIES CO., LTD.
www.huawei.com
Huawei Confidential
Security Level: 内部公开 23/4/11
英文标题 :40-47pt
副标题 :26-30pt
字体颜色 : 反白内部使用字体 :
FrutigerNext LT Medium
外部使用字体 : Arial
中文标题 :35-47pt
字体 : 黑体 副标题 :24-28pt
字体颜色 : 反白字体 : 细黑体
2G-3G Interworking Solution
Technology changes. Communication lasts 2
Huawei 3G/2G Roaming Solution
Dual mode terminal is preferred to camp on 3G network
Cell re-selection from WCDMA to GSM is triggered only when 3G
subscribers leave the WCDMA coverage area
Cell re-selection from GSM to WCDMA starts immediately when
3G subscribers enter into the WCDMA coverage area.
Dual mode terminal is preferred to camp on 3G network
GSM
WCDMA
WCDMA
UMTS->GSM cell reselection
GSM->UMTS cell reselection
Technology changes. Communication lasts 3
Cell Selection & Reselection
2G Coverage only
Camp on 3G network
Camp on 3G network
Camp on 2G network
Camp on 2G network Cell Reselection to 3G network
Cell Reselection to 2G network
3G Coverage
• Function of Cell Selection• Perform measurements • Detect and synchronize to a
broadcast channel• Search for a suitable cell • Camp on a cell
• Function of Cell Selection• Perform measurements • Detect and synchronize to a
broadcast channel• Search for a suitable cell • Camp on a cell
• Function of Cell Reselection• Perform measurements• Detect and synchronize to a
broadcast channel• Change cell if a more
suitable cell is found
• Function of Cell Reselection• Perform measurements• Detect and synchronize to a
broadcast channel• Change cell if a more
suitable cell is found
Technology changes. Communication lasts 4
Huawei Handover StrategyHuawei Handover Strategy
2G Coverage
Handover to 2G 3G Coverage
Cell Reselection to 3G
Cell Reselection to GPRS
Cell Reselection to WCDMA
CS Handover
PS Handover
CS Handover Strategy: Uni-direction handover from 3G to 2G based on
coverage, 2G back to 3G by cell reselection or PLMN reselection in idle
status
PS Handover Strategy: 3G and 2G bi-direction handover by cell
reselection
Thank youwww.huawei.com
