本节描述了SIM向GSM的MM和GMM提供的信息。

在GSM协议11.11中对GSM操作的前提有如下描述

For a SIM of Phase 2 or greater, GSM operation shall only start if one of the two following conditions is

fulfilled:

- if EFIMSI and EFLOCI are not invalidated, the GSM operation shall start immediately;

- if EFIMSI and EFLOCI are invalidated, the ME rehabilitates these two EFs.

那么SIM应该提供哪些信息呢？流程是什么样的呢？

Afterwards, the ME runs the following procedures:

- Administrative Information request;

- SIM Service Table request;

- IMSI request;

- Access Control request;

- HPLMN Search Period request;

- PLMN selector request;

- Location Information request;

- Cipher Key request;

- BCCH information request;

- Forbidden PLMN request;

- CBMID request;

- Depersonalisation Control Keys request

- Network’s indication of alerting request (if $(NIA)$ is supported)

好了，我们来看看TI是如何实现这部分协议栈的代码的吧。

总的流程如下（app_sim_read_parameters函数中）

result = app_fdn_bdn_procedures (sim_mmi_insert_ind);

if ((result EQ SIM_NO_OPERATION) OR

!app_sim_mm_insert_ind (sim_mmi_insert_ind))

app_sim_mmi_insert_ind (sim_mmi_insert_ind, SIM_NO_OPERATION);

else

app_sim_mmi_insert_ind (sim_mmi_insert_ind, result);

PSENDX (MMI, sim_mmi_insert_ind);

if (result NEQ SIM_NO_OPERATION)

app_sim_sms_insert_ind ();

在app_fdn_bdn_procedures函数中会对SIM的IMSI和LOCI是否支持进行判断，同时对bdn和fdn进行判断。

当然一般的SIM卡肯定不会是SIM_NO_OPERATION的，所以必然会进行app_sim_mm_insert_ind (sim_mmi_insert_ind)。

GLOBAL UBYTE app_sim_mm_insert_ind (T_SIM_MMI_INSERT_IND * sim_mmi_insert_ind)

{

//首先分配一个SIMMM协议原语

PALLOC (sim_mm_insert_ind, SIM_MM_INSERT_IND);

SIM_CLEAR_FLAG (TEST_SIM_INSERTED);

//读取administrative data

if (FKT_Select (SIM_AD, response, SIM_MIN_EF_ST_LEN) EQ SIM_NO_ERROR)

sim_mm_insert_ind->c_ad = (UBYTE)length;

if(FKT_ReadBinary ((UBYTE *)&sim_mm_insert_ind->ad, 0, length) EQ SIM_NO_ERROR)

//如果ad[0]&0x80为真表示这是一张测试卡

if(sim_mm_insert_ind->ad[0] & 0x80)

{

SIM_SET_FLAG (TEST_SIM_INSERTED);

#if defined SIM_TOOLKIT

SIM_SET_FLAG (TEST_MODE_POLLING);

#endif

}

/*

* read IMSI (set to zero in case of error)

*/

memset (&sim_mmi_insert_ind->imsi_field, 0, sizeof (T_imsi_field));

if (FKT_Select (SIM_IMSI, NULL, 0) EQ SIM_NO_ERROR)

{

if (FKT_ReadBinary ((UBYTE *)&sim_mm_insert_ind->imsi_field, 0, MAX_IMSI)

…………..

}

/*

* Modify polling algorithm in case of HPLMN == Test Network

*/

if ((sim_mm_insert_ind->imsi_field.c_field >= 3) AND

((sim_mm_insert_ind->imsi_field.field[0] & 0xF7) EQ 0x01) AND

(sim_mm_insert_ind->imsi_field.field[1] EQ 0x10) AND

(sim_mm_insert_ind->imsi_field.field[2] EQ 0x10))

{

SIM_SET_FLAG (TEST_SIM_INSERTED);

#if defined SIM_TOOLKIT

SIM_SET_FLAG (TEST_MODE_POLLING);

#endif

}

/*

* read location information

*/

if (FKT_Select (SIM_LOCI, NULL, 0) EQ SIM_NO_ERROR)

/*

* Access control classes

*/

if (FKT_Select (SIM_ACC, NULL, 0) EQ SIM_NO_ERROR)

/*

* BCCH information

*/

if (FKT_Select (SIM_BCCH, NULL, 0) EQ SIM_NO_ERROR)

/*

* KC and cipher key sequence number

*/

if (FKT_Select (SIM_KC, NULL, 0) EQ SIM_NO_ERROR)

/*

* Read Preferred PLMNs

*/

if (SIM_IS_FLAG_SET (SERVICE_7_SUPPORT))

{

if (FKT_Select (SIM_PLMNSEL, response, SIM_MIN_EF_ST_LEN) EQ SIM_NO_ERROR)

/*

* Read forbidden PLMNs

*/

if (FKT_Select (SIM_FPLMN, NULL, 0) EQ SIM_NO_ERROR)

/*

* Read Acting HPLMN 

*/

FileSelRes = FKT_Select(SIM_CING_AHPLMN, NULL, 0);

#if defined (GPRS)

gprs_gmm_insert_ind (sim_mm_insert_ind);

#endif

/*

* send information to mobility management

*/

PSENDX (MM, sim_mm_insert_ind);

SIM_SET_FLAG (MM_KNOWS_FROM_SIM);

}