PRL List Preferred Roaming List, Roaming priority List
Is stored in the CDMA terminal (such as mobile phone, data card) in a database, for terminal machine card separation, PRL stored in UIM card,
PRL help mobile system is the main purpose of the search, capture and selection function, CDMA terminal choice, capture network is fully automatic, does not require user intervention, when a terminal system when the choice, PRL to provide relevant information to the terminal, such as what frequencies or frequency point should be to search network, which system is available, which system is preferred, which system is disabled, the terminal will be in accordance with the above information to search, select the optimal network and capture,
PRL system form includes belonging operator and roaming partner network information system, and the capture form including the terminal point of spectrum and frequency to search information, terminal using the information in the chart the two complete system of automatic search and seizure, PRL standard IS 683 series, version from the IS - 683 - a to the IS - 683 - d, PRL by operator, customization, and stored in the UIM card,
China telecom applications of PRL introduction
In the CDMA 1 x period, the PRL for China telecom IS - 683 - a format, support CDMA x800m 1 and 1.9 G,
IS - 683 - c version IS 450 m and other new defines the Extended spectrum Acquisition Record Type and based Acquisition Record. To support the search for EVDO system, increased the HRPD capture record and system record, and on 1 x and DO the deployment of the relationship between network are defined,
To support 1 x and DO network at the same time, China telecom has adopted cascade PRL, PRL by means of cascading a PRL + 683 c 683 PRL, a PRL file contains two parts: the first part is 683 a format of PRL, the second part is 683 c format PRL, 683 a format PRL contains the original 800 MHZ CDMA2000 1 x 683 a format of mobile phone design content of PRL, including: 800 MHZ band and the corresponding frequency points, PCS frequencies and the corresponding frequency point (for international roaming), all have opened international roaming abroad and China telecom CDMA network information carriers, 683 c format associated PRL level 683 a format PRL, contains the original 800 MHZ CDMA2000 1 x 683 a format of PRL of mobile phone design content: the 800 MHZ band and the corresponding frequency points, PCS frequencies and the corresponding frequency point (for international roaming), all have opened international roaming abroad and China telecom CDMA operator network information, including 450 MHZ China telecom network information (450 MHZ band and the corresponding frequency points, China telecom 450 MHZ network information system) and China telecom ev-do network frequency and system parameter information and in the future and China telecom EVDO opened international roaming the other frequency point and information network,
Ordinary CDMA2000 1 x cell phone (not 450 MHZ phones) read only the cascade of PRL in the first part, namely 683 a format of PRL, according to the PRL frequency point and network information listed in the select CDMA2000 1 x network; Ev-do terminal reads the entire CPRL, and select the second part use (i.e. for 683 c PRL), according to the 683 c format PRL frequency point and listed in the information network system, choose the EVDO network,
The composition of PRL list
PRL list includes global Properties (Properties), access to table (Acquisition Records) and System tables three most of the System Records)
Global properties: specifies the PRL list some global properties, such as the preferred only bit, roaming version information, such as column table
Access to table: the main is to search all the index of channel, its every item is description of a particular wireless environment,
System tables: is the index of a specific system, its existence is the identification number/network system identification number (SID/NID), as well as on the system identification number/network identification number of priority and whether for roaming status identified,
List of reading
A Neg/Pref: Pref means mobile station is allowed to run on the system, Neg said not allowed, the field associated with Preferred Only attributes of Properties, used as the Preferred Only attribute can make, the system of this field is set to Neg record will not be available
Levenshtein distance Indicator: roaming Indicator, this property has three values: 0,1,2,0 represents open, 1 on behalf of the closed, 2 on behalf of the flashing display, you can override the properties record the default roaming instructions
SID/NID, subnet configures ID: 95 or 1 x terminal through the SID/NID to differentiate between the network and network to DO (i.e., the system record identified as the IS - 856) by subnet configures ID to distinguish between different networks. The SID IS the identification system, each district cities only one SID, IS the only, NID IS network identification number, by the network management, which IS assigned by the regional division,
Wildcard introduction: UIM card storage capacity is limited, and each operator use access channel and system identification number/network identification number are not the only one, such as Verizon CDMA network in the United States to use resources of system identification number more than 500, so the operator all system identification number/network identification number wrote PRL will take up a lot of space, therefore, the introduction of the wildcard, which every access channel to obtain in the table in the system can use wildcards in the table identifier, without having to identify each system identification number, but as a result of wild-cards introduction may appear not cooperation operator access to the network, roaming problems, for 95, 1 x network, said SID labeled 0 wildcard, SID or any network to which the system record is available, NID labeled said 65535 under the same SID any NID is as local network, to DO network, subnet configures ID value "/0" wildcard,
open pause network registration process
First of all, the Phone will hold off before and had Recently registered network frequency and system information, this, GSM and CDMA system is the same, this is the so-called "mobile Phone memory effect", CDMA mobile phones will had Recently registered network frequency and system information is stored in the MRU (Most Recently, informs the List), the maximum of 12, when through MRU was unable to complete the network selection, cell Phone will search can access by PRL one by one frequency point and network, after startup, mobile Phone, in accordance with MRU, PRL, Phone Settings priorities to create frequency point scanning List (Full scan List), and according to the order List sequence capture frequency point, after successful capture frequency point, search the strongest pilot frequency, read the synchronization channel information, access to network SID/NID, then, the Phone will get the SID/NID matching with PRL List, if the match is successful, the registration network; If there is no matching, the record for "the Available system", this network phone order, according to the list of capture the next frequency point, unless otherwise stipulated in the frequency point scanning list and PRL match, when set to "TRUE" "of" optimizing PRL, mobile phone temporarily into "Sleep" dormant state; When set to "FALSE" "optimizing PRL", the phone will attempt to "the Available system" registration network,
PRL file read
1, access PRL file: QPST - & gt; The Service Programming - & gt; OK - & gt; Read from the Phone - & gt; Save to File, choose QCN, generates two files, will be. R10 File suffix changed. PRL
2, read the list of PRL: QPST - & gt; RL Editor - & gt; Open the File, if it's DianXinKa PRL File will separate the two PRL File, respectively corresponding to 683 a, 683 c
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