漫游短信歡迎系統(tǒng)主要根據(jù)信令監(jiān)測技術(shù)，監(jiān)測用戶在信令網(wǎng)絡(luò)發(fā)生的Update_Location信令過程，判斷用戶的漫游類
型（漫入、漫出、漫回、離網(wǎng)）。當用戶發(fā)生漫游時，用戶需要在當前所在的MSC向用戶歸屬的HLR發(fā)送
Update_Location信令，通過信令監(jiān)測的手段獲取此信令消息中的手機號碼（IMSI、MSISDN），HLR GT碼判斷用戶的
歸屬即用戶是哪個國家，哪個區(qū)域，哪個城市的用戶，通過信令監(jiān)測的手段獲取此信令中的VLR GT碼判斷用戶目前所
在的位置即漫游到了哪個國家，哪個區(qū)域，哪個城市；根據(jù)用戶的歸屬網(wǎng)絡(luò)和漫游目的地分析用戶發(fā)生的各種漫游場
景，并根據(jù)預(yù)先定義的短信發(fā)送規(guī)則，發(fā)送漫游短信內(nèi)容。
對于漫入規(guī)則，需要判斷用戶為非本地或本區(qū)域或本國家的用戶，漫游地為本地網(wǎng)絡(luò)或本地區(qū)域網(wǎng)絡(luò)或本地國家網(wǎng)絡(luò)
，滿足上述的條件，系統(tǒng)判斷用戶發(fā)生漫入行為。
對于漫出規(guī)則，需要判斷用戶為本地或本區(qū)域或本國家的用戶，漫游目的地為非本地網(wǎng)絡(luò)或非本區(qū)域網(wǎng)絡(luò)或非本國家
網(wǎng)絡(luò)，滿足上述的條件，系統(tǒng)判斷用戶發(fā)生漫出行為。
對于漫回規(guī)則，首先系統(tǒng)判斷用戶已經(jīng)發(fā)生了漫出行為，而后本網(wǎng)絡(luò)用戶由發(fā)生了漫入行為，兩種行為關(guān)聯(lián)分析，系
統(tǒng)判斷用戶發(fā)生了漫回行為。
對于離網(wǎng)規(guī)則，首先系統(tǒng)判斷非本網(wǎng)絡(luò)用戶發(fā)生了漫入行為，而后非本網(wǎng)絡(luò)用戶離開了本網(wǎng)絡(luò)，兩種行為進行關(guān)聯(lián)分
析，系統(tǒng)判斷用戶發(fā)生了離網(wǎng)行為。
信令監(jiān)測點的選取條件：
1、 必須能夠?qū)⑺械腗AP的Update_Location信令都能夠捕獲到，即該監(jiān)測點必須設(shè)置在MAP的Update_Location
信令的必經(jīng)之路上。
2、 雖然MAP位置更新信令的必經(jīng)之路上有很多監(jiān)測點可以選取，但是必須依據(jù)監(jiān)測鏈路最省原則選取。
1、 漫入歡迎短信
（1） 南區(qū)內(nèi)部Circle之間的漫入歡迎短信
南區(qū)內(nèi)從一個Circle漫游區(qū)漫入到其它Circle漫游區(qū)（任意其它4個Circle用戶漫入到其中1個Circle，五個Circle為Kerala
Circle、TN Circle、Channel Circle、KTK Circle、AP Circle）
（2） 4個區(qū)域之間的漫入歡迎短信
其它Zone漫游區(qū)（Zone漫游區(qū)包括東西南北4個區(qū)域），其它3個區(qū)域漫入到南區(qū)漫游區(qū)發(fā)送漫入歡迎短信。
（3） 其它國家用戶漫入南區(qū)歡迎短信Roaming Message Welcome System is, mainly based on signaling monitoring
technologies, to monitor subscribers’ Update_Location signaling process generated in the signaling network and judge
subscribers’ roaming type (roam-in, roam-out, roam-back, and network-off). When subscribers’ roaming happens, subscribers
need to send Update_Location signaling in the current MSC to HLR to which subscribers belong, then the cell phone number
(IMSI, MSISDN) in this signaling information will be obtained through signaling monitoring means. HLR GT will judge
subscribers’ identification, that is, which city of which region in which country subscribers are, then VLR GT in this signaling
will be obtained through signaling monitoring means to judge subscribers’ current location, that is, roam in which city of which
region in which country. Finally, the system will analyze various roaming scenes generated by subscribers according to
subscribers’ identifying network and roaming destination and then send the roaming SMS content according to the predefined
SMS sending rules.
For roam-in rules, it requires to judge whether the subscriber is the non-local/regional/country subscriber and whether the
roaming area is covered by the local/regional/country network, if both yes, the system will judge the subscriber generates roam-
in behavior.
For roam-out rules, it requires to judge whether the subscriber is the local/regional/country subscriber and whether the roaming
destination is covered by the non-local/regional/country network, if both yes, the system will judge the subscriber generates
roam-out behavior.
For roam-back rules, the system firstly judges the subscriber has generated roam-out behavior and then the subscriber in the
current network generates roam-in behavior, through the association analysis of two behaviors, the system will judge the
subscriber generates roam-back behavior.
For network-off rules, the system firstly judges the subscriber beyond the current network has generated roam-in behavior and
then the subscriber beyond the current network leaves the current network, through the association analysis of two behaviors,
the system will judge the subscriber generates network-off behavior.
Selection conditions of signaling monitoring points:
1. Must capture all MAP’s Update_Location signaling, namely, the monitoring point must be setup in the link that MAP’
s Update_Location signaling will certainly pass.
2. Although there are many optional monitoring points in the link that MAP’s Update_Location signaling will certainly
pass, the selection must be done based on the most saving principle of monitoring links.