70 lines
11 KiB
HTML
Executable File
70 lines
11 KiB
HTML
Executable File
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<h1 class="p_Heading1"><span class="f_Heading1">BSS</span></h1>
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<a href="0_0.htm">Top</a>
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<!-- Placeholder for topic body. -->
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<table style="width:100%;border:none;border-spacing:0px"><tr style="vertical-align:top"><td style="text-align:left;padding:5px">
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<p style="background: #99ccff;"><span style="font-weight: bold;">Descriptions</span></p>
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<p class="p_NoramlTest"><span class="f_NoramlTest"> </span></p>
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<p style="line-height: 1.50; margin: 0px 12px 5px 12px;"><span class="f_NoramlTest">The BSS is composed of two parts:</span></p>
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<p style="text-align: left; padding: 0px 0px 0px 13px; margin: 0px 12px 5px 12px;"><span style="font-size:10pt; font-family: 'Arial Unicode MS','Lucida Sans Unicode','Arial';color:#000000;display:inline-block;width:13px;margin-left:-13px">•</span><span class="f_NoramlTest">The Base Transceiver Station (BTS)</span></p><p style="text-align: left; padding: 0px 0px 0px 13px; margin: 0px 12px 5px 12px;"><span style="font-size:10pt; font-family: 'Arial Unicode MS','Lucida Sans Unicode','Arial';color:#000000;display:inline-block;width:13px;margin-left:-13px">•</span><span class="f_NoramlTest">The Base Station Controller (BSC)</span></p><p class="p_NoramlTest"><span class="f_NoramlTest"> </span></p>
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<p class="p_NoramlTest" style="line-height: 1.50;"><span class="f_NoramlTest">The Base Station Controller (BSC) manages the radio resources for one or more BTSs. It handles radio channel setup, frequency hopping, and handovers. The BSC is the connection between the mobile and the MSC. The BSC also translates the 13 Kbps voice channel used over the radio link to the standard 64 Kbps channel used by the Public Switched Telephone Network.</span></p>
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<p class="p_NoramlTest"><span class="f_NoramlTest"> </span></p>
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<p style="line-height: 1.50; margin: 0px 12px 5px 12px;"><span class="f_NoramlTest">It assigns and releases frequencies and time slots for the MS. The BSC also handles intercell handover. It controls the power transmission of the BSS and MS in its area. The function of the BSC is to allocate the necessary time slots between the BTS and the MSC. It is a switching device that handles the radio resources. Additional functions include:</span></p>
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<p style="text-align: left; padding: 0px 0px 0px 13px; margin: 0px 12px 5px 12px;"><span style="font-size:10pt; font-family: 'Arial Unicode MS','Lucida Sans Unicode','Arial';color:#000000;display:inline-block;width:13px;margin-left:-13px">•</span><span class="f_NoramlTest">Control of frequency hopping </span></p><p style="text-align: left; padding: 0px 0px 0px 13px; margin: 0px 12px 5px 12px;"><span style="font-size:10pt; font-family: 'Arial Unicode MS','Lucida Sans Unicode','Arial';color:#000000;display:inline-block;width:13px;margin-left:-13px">•</span><span class="f_NoramlTest">Performing traffic concentration to reduce the number of lines from the MSC </span></p><p style="text-align: left; padding: 0px 0px 0px 13px; margin: 0px 12px 5px 12px;"><span style="font-size:10pt; font-family: 'Arial Unicode MS','Lucida Sans Unicode','Arial';color:#000000;display:inline-block;width:13px;margin-left:-13px">•</span><span class="f_NoramlTest">Providing an interface to the Operations and Maintenance Center for the BSS </span></p><p style="text-align: left; padding: 0px 0px 0px 13px; margin: 0px 12px 5px 12px;"><span style="font-size:10pt; font-family: 'Arial Unicode MS','Lucida Sans Unicode','Arial';color:#000000;display:inline-block;width:13px;margin-left:-13px">•</span><span class="f_NoramlTest">Reallocation of frequencies among BTSs </span></p><p style="text-align: left; padding: 0px 0px 0px 13px; margin: 0px 12px 5px 12px;"><span style="font-size:10pt; font-family: 'Arial Unicode MS','Lucida Sans Unicode','Arial';color:#000000;display:inline-block;width:13px;margin-left:-13px">•</span><span class="f_NoramlTest">Time and frequency synchronization </span></p><p style="text-align: left; padding: 0px 0px 0px 13px; margin: 0px 12px 5px 12px;"><span style="font-size:10pt; font-family: 'Arial Unicode MS','Lucida Sans Unicode','Arial';color:#000000;display:inline-block;width:13px;margin-left:-13px">•</span><span class="f_NoramlTest">Power management </span></p><p style="text-align: left; padding: 0px 0px 0px 13px; margin: 0px 12px 5px 12px;"><span style="font-size:10pt; font-family: 'Arial Unicode MS','Lucida Sans Unicode','Arial';color:#000000;display:inline-block;width:13px;margin-left:-13px">•</span><span class="f_NoramlTest">Time-delay measurements of received signals from the MS </span></p><p class="p_NoramlTest"><span class="f_NoramlTest"> </span></p>
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<p class="p_NoramlTest" style="line-height: 1.50;"><span class="f_NoramlTest">The Base Transceiver Station (BTS) houses the radio transceivers that define a cell and handles the radio link protocols with the MS. In a large urban area, a large number of BTSs may be deployed.</span></p>
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<p class="p_NoramlTest"><span class="f_NoramlTest"> </span></p>
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<p style="line-height: 1.50; margin: 0px 12px 5px 12px;"><span class="f_NoramlTest">The BTS corresponds to the transceivers and antennas used in each cell of the network. A BTS is usually placed in the center of a cell. Its transmitting power defines the size of a cell. Each BTS has between 1 and 16 transceivers, depending on the density of users in the cell. Each BTS serves a single cell. It also includes the following functions:</span></p>
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<p style="text-align: left; padding: 0px 0px 0px 13px; margin: 0px 12px 5px 12px;"><span style="font-size:10pt; font-family: 'Arial Unicode MS','Lucida Sans Unicode','Arial';color:#000000;display:inline-block;width:13px;margin-left:-13px">•</span><span class="f_NoramlTest">Encoding, encrypting, multiplexing, modulating, and feeding the RF signals to the antenna. </span></p><p style="text-align: left; padding: 0px 0px 0px 13px; margin: 0px 12px 5px 12px;"><span style="font-size:10pt; font-family: 'Arial Unicode MS','Lucida Sans Unicode','Arial';color:#000000;display:inline-block;width:13px;margin-left:-13px">•</span><span class="f_NoramlTest">Transcoding and rate adaptation </span></p><p style="text-align: left; padding: 0px 0px 0px 13px; margin: 0px 12px 5px 12px;"><span style="font-size:10pt; font-family: 'Arial Unicode MS','Lucida Sans Unicode','Arial';color:#000000;display:inline-block;width:13px;margin-left:-13px">•</span><span class="f_NoramlTest">Time and frequency synchronizing </span></p><p style="text-align: left; padding: 0px 0px 0px 13px; margin: 0px 12px 5px 12px;"><span style="font-size:10pt; font-family: 'Arial Unicode MS','Lucida Sans Unicode','Arial';color:#000000;display:inline-block;width:13px;margin-left:-13px">•</span><span class="f_NoramlTest">Voice through full- or half-rate services </span></p><p style="text-align: left; padding: 0px 0px 0px 13px; margin: 0px 12px 5px 12px;"><span style="font-size:10pt; font-family: 'Arial Unicode MS','Lucida Sans Unicode','Arial';color:#000000;display:inline-block;width:13px;margin-left:-13px">•</span><span class="f_NoramlTest">Decoding, decrypting, and equalizing received signals </span></p><p style="text-align: left; padding: 0px 0px 0px 13px; margin: 0px 12px 5px 12px;"><span style="font-size:10pt; font-family: 'Arial Unicode MS','Lucida Sans Unicode','Arial';color:#000000;display:inline-block;width:13px;margin-left:-13px">•</span><span class="f_NoramlTest">Random access detection </span></p><p style="text-align: left; padding: 0px 0px 0px 13px; margin: 0px 12px 5px 12px;"><span style="font-size:10pt; font-family: 'Arial Unicode MS','Lucida Sans Unicode','Arial';color:#000000;display:inline-block;width:13px;margin-left:-13px">•</span><span class="f_NoramlTest">Timing advances </span></p><p style="text-align: left; padding: 0px 0px 0px 13px; margin: 0px 12px 5px 12px;"><span style="font-size:10pt; font-family: 'Arial Unicode MS','Lucida Sans Unicode','Arial';color:#000000;display:inline-block;width:13px;margin-left:-13px">•</span><span class="f_NoramlTest">Uplink channel measurements </span></p><p class="p_NoramlTest"><span class="f_NoramlTest"> </span></p>
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<p class="p_NoramlTest" style="line-height: 1.50;"><span class="f_NoramlTest">Please note that before you can create a BSC object, you must have a physical BSC installed and connected to the MSC. The BSC to EMS connection is over ethernet. The MSC to BSC connection, which is called the A interface, is over one or more E1 or T1 links. To install the BSC hardware, please refer to the BSC Installation and Commissioning Guide.</span></p>
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<p class="p_NoramlTest"><span class="f_NoramlTest"> </span></p>
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<p class="p_NoramlTest"><span class="f_NoramlTest"> </span></p>
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<p style="background: #99ccff;"><span style="font-weight: bold;">Return to</span></p>
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<p class="p_NewStyle"><span class="f_NewStyle"> </span></p>
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<p style="text-align: left; padding: 0px 0px 0px 13px; margin: 0px 12px 0px 12px;"><span style="font-size:10pt; font-family: 'Arial Unicode MS','Lucida Sans Unicode','Arial';color:#000000;display:inline-block;width:13px;margin-left:-13px">•</span><span class="f_NoramlTest"><a href="2_3.htm" class="topiclink">Tasks List</a></span></p><p class="p_NewStyle"><span class="f_NewStyle"> </span></p>
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<p style="text-align: left; padding: 0px 0px 0px 13px; margin: 0px 12px 0px 12px;"><span style="font-size:10pt; font-family: 'Arial Unicode MS','Lucida Sans Unicode','Arial';color:#000000;display:inline-block;width:13px;margin-left:-13px">•</span><span class="f_NoramlTest"><a href="2_1.htm" class="topiclink">Elements List</a></span></p><p class="p_NoramlTest"><span class="f_NoramlTest"> </span></p>
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<p class="p_NoramlTest"><span class="f_NoramlTest"> </span></p>
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<p class="p_NoramlTest"><span class="f_NoramlTest"> </span></p>
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<p class="p_NoramlTest"><span class="f_NoramlTest"> </span></p>
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<p class="p_NoramlTest"><span class="f_NoramlTest"> </span></p>
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<p class="p_NoramlTest" style="text-align: right;"><span class="f_NoramlTest" style="font-size: 8pt;">2.1.1</span></p>
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</td></tr></table>
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