The inspector is checking the content of acceptance standard of cell ...

The base station to mobile station to send the extended switching indication message EHDM (Extended Handoff Direction Message) or ordinary switch directions message GHDM (General Handoff the Direction Message). mscbsc Mobile Communications Forum has 300,000 communications professionals, more than 50 million copies of GSM/3G and information communication technology, the country O3) the mobile station the pilot included in the active set and switch to the base station to send a message of HCM (Handoff Completion the Message) . , It corresponds to the switch to remove the timer timer started when the pilot strength is lower than T_DROP. When the switch remove the overflow timer expires, the mobile station to the base station to send conduction band strength measurement message. Hold every cell phone and test the effective shielding radius of cell phone jammer from the near to the distant starting from cell phone jammer installation position.
Base station to mobile station to send EHDM or GHDM. Mobile station to the pilot moved to the candidate set, and switch to the base station sends a message of HCM. Pilot home to search for mobile communications, communications engineers, communications personnel, job recruitment, network optimization, traffic engineering, travel accommodation, communications companies blacklist. a variety of conductivity of the above, the base station frequency of collection, respectively, provides for the corresponding search window (PN code phase offset range), mobile search corresponding to the pilot all the available focus on the pilot multipath components in each window. Search window is the active set and candidate set SRCH_WIN_A to determine the search window of the neighbor set is determined by the SRCH_WIN_N SRCH_WIN_R provides for a residual set of search window. These three parameters are included in the paging channel to send the system parameters message. The inspector is checking the content of acceptance standard ofcell phone jammersystem.
Concentration four or more pilot signals in the CDMA mobile station activation (the pilot and the best guide frequency Ec / Io value difference is less than 6dB, and the than T_ADD threshold, but which does not have a The signal can be strong enough to become a true dominant frequency), in these regions, the other is not the mobile station to activate the sudden appearance of the concentration of a strong pilot signal generation leading to dropped calls mobile station in the handover process, the strong pilot signal as a potential sources of interference, which is the origin of the concept of pollution pilot. Ec / Io poor network signal level is good, that is in an area without a pilot of sufficient strength to the dominant cover, a few pilot strength considerable. Signal fast fading caused by frequent switching between different sectors of the business channel in the mobile station call, can easily result in dropped calls. For the cell phone and cell phone jammer market has the large potential, it can bring the large-scale interest.
Then if there is no outside interference factors from many cell signal in the region, resulting in poor Ec / Io, coverage is not good, and this is the pilot pollution case. Ec / Io difference is generally considered as <-12dB. Consider, therefore, can be a strong guide frequency with 4 guide frequency to compare effective Rake receiver of the cell phone number of three, is generally believed that if the difference is less than 3dB is considered to be the existence of pilot pollution. In CDMA networks, pilot pollution into the pilot phase of pollution and the pilot strength of pollution. Pilot pollution we usually referred to the guidance of the frequency of intensity of pollution. The pilot phase contamination. Forward channel in the CDMA system, each sector is different short PN code to distinguish between different PN offset. There appears cell phone jammer with the beautiful drawing appearance in the market.
15 order of the shift register pseudo-random sequence of 215 Chip CDMA provisions of 64 Chip as a group, then a total of 215 ? 64 = 512 group, which is 512 PN code. If two identical PN sectors to cover a certain area, then the cell phone at the same time in the region to receive two identical PN sector signal, the cell phone can not distinguish between which the communicating base station, this phenomenon is the pilot phase contamination ; if a sector of the signal through the path transmission delay is greater than 64chip the cell phone is another PN, may lead to different phase sectors through the same phase in the path of transmission to reach cell phone, which resulted in the pilot phase contamination. The accurate control of timely switching on or off can be carried out for cell phone jammer shielding by positions or groups through the software.

This entry was posted in Cell Phone Jammer. Bookmark the permalink.

Source: http://www.phone-jammer-cell.com/the-inspector-is-checking-the-content-of-acceptance-standard-of-cell-phone-jammer-system/

50 50 gene simmons family jewels dream house dream house taylor martinez taylor martinez o brother where art thou