Recent questions tagged mobile-computing

Description : What is Hidden terminals problem?

Last Answer : Suppose that there are three mobile A, B, and C. The transmission range of A reaches B, but not C. The transmission range of C reaches B, but not A. Finally the transmission range of B ... cannot detect this collision at B and continues with its transmission. A is hidden for C and vice versa.

Description : Describe Mobile IP.

Last Answer : Mobile IP is an open standard that allows users to keep the same IP address and stay connected while roaming between IP networks. Mobile IP provides the facility to users to keep the same IP ... when it roams to a foreign network, delivering packets from the Home Agent to the Mobile Node.

Description : Operation subsystem.

Last Answer : It provides the necessary functions for network operation and maintenance. The OSS contains the following interties. - Operation and maintenance center (OMC): - Authentication Centre (AuC): - Equipment ... . - Temporary mobile subscriber identity (TMSI). - Mobile station7 roaming number (MSRN).

Description : Network and switching subsystem (NSS).

Last Answer : The NSS comprises MSC, HLR and VLR. Mobile services switching center (MSC): These are high performance digital switches. An MSC manages several BSCs and provide connections to other MSCs and to ... users currently in the (location area) LA that is associated to the Mobile Switching Center.

Description : Explain GSM architecture in detail.

Last Answer : A GSM system consists of three subsystems, the radio sub system (RSS), the network and switching subsystem (NSS), and the operation subsystem (OSS). 1. Radio subsystem The radio subsystem (RSS) ... follows: - Reserves radio frequencies. - Handles the handover. - Performs paging of the MS.

Description : What are the different services provided by GSM.

Last Answer : GSM provides the following types of services. - Bearer services: - Tele Service: i. Encrypted voice transmission ii. Short message service iii. Emergency number iv. Data ... user groups Bearer services permit transparent and non-transparent, synchronous or asynchronous data transmission.

Description : What is mobile agent?

Last Answer : A mobile agent is a software that can move across the network and represent various tasks. It is a distributed computing paradigm. So you can think agent is an independent software ... different type of application and area such as: Internet, Electronic commerce, Mobile Computing, Networking.

Description : Describe Handoff in cellular networks.

Last Answer : When a user talks on the mobile phone to other user it may happen that the mobile station moves from one cell to another. During this conversation signal may become weak. To solve this problem ... may continue communicate with the new base station before link is break off from the old one.

Description : What are the limitation of mobile computing?

Last Answer : Range and Bandwidth: In general direct cable connection is faster than mobile internet conection. 2G, 3G, 4G networks are fast but these networks are usually available within range of cell phone ... while driving so it may cause accident. Cell phones may interfere with sensitive medical devices.

Description : Describe the types of wireless applications.

Last Answer : Now a day mobile application is used in every field in real life. Some of them are. - In Vehicles - In Hospitals - In Business - In Entertainment - In Location dependent services - In ... -Sensor --Embedded controllers --Pager --Mobile phones --Personal digital assistant --Laptop