问题 问答题 简答题

简述从Abis口到A口的语音信令流程。

答案

参考答案:

在服务小区内,一旦移动客户拨号后,移动台向基站请求随机接入信道。

在移动台MS与移动业务交换中心MSC之间建立信令连接的过程。

对移动台的识别码进行鉴权,如果需加密则设置加密模等,进入呼叫建立的起始阶段。

分配业务信道的过程。

采用七号信令的客户部分(1SUP/TUP),建立与固定网(ISDN/PSTN)至被叫客户的通路,并向被叫客户振铃,向移动台回送呼叫接通证实信号。

被叫客户取机应答,向移动台发送应答连接消息,最后进入通话阶段。

完形填空
完形填空。
     When I was 18 years old, one morning, my father told me to drive him into a town, about 40 miles away.
I had just learned to  1 , so I agreed with pleasure. When we came to the town, something was wrong with
the car. Then I took the car to a nearby garage to have it  2  and promised to pick Dad up at 4 pm. Because
I had a few hours to spend, I decided to go to the  3 . However I became  4   interested in the film that I
forgot the time. When the last film finished, it was 6 o'clock.
      I was afraid Dad would be  5  and never let me drive again, so I drove back quickly to meet Dad and
made an excuse (借口)  6  my being late. I'll never forget the cry he gave me: "I'm disappointed that I feel
you have to tell a lie to me, Jack. I'm angry, not with  7  but with myself. I have failed  8  I've brought up a
son who can not even tell the truth to his own father. I'm going to walk home now and think seriously
about  9  I have done wrong all these years."
     Dad began  10  along the road. I begged (乞求) all the way, telling him how I drove behind him for 40
miles, at a speed of  5 miles an hour. It was the most unforgettable lesson. I have never told a lie to him ever
since.
( )1. A. drive   
( )2. A. made   
( )3. A. concert  
( )4. A. very   
( )5. A. excited  
( )6. A. at    
( )7. A. me    
( )8. A. so    
( )9. A. where   
( )10. A. running
B. work   
B. repaired
B. bookstore
B. too    
B. angry   
B. to    
B. it    
B. because  
B. when   
B. driving  
C. live    
C. waited   
C. shop    
C. so      
C. disappointed
C. for      
C. you      
C. after    
C. why      
C. crying   
D. travel 
D. parked 
D. cinema 
D. fairly 
D. sad    
D. with   
D. him    
D. before 
D. how                                       
D. walking
单项选择题