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<h2>Impact on planning</h2>

<p>EQoS introduces Guaranteed Bit Rate in BSS by implementing seven Treatment
Classes (TRECs) and by assuring that enough resources are dedicated to PSW
to support certain services.</p>


<p>The QoS attributes are part of PDP context between the terminal and
GGSN. Based on the attribute values the data can be marked and directed into
different queues in the network elements and thus the packets are treated
differently depending on their QoS attributes.</p>


<p>The CS traffic in the cell may not have priority over PSW. Pre-emption
on PS territory due to CS traffic will be allowed by PCU if re-allocation
is possible by maintaining negotiated QoS. If re-allocation is not possible,
downgrade will be denied and CS may be blocked.</p>


<p>The impact of EQoS for network planning depends on network support and
mobile support. Network support is mainly influenced by PCU2 deployment strategy.
When MS capability is concerned, the most important input is EQoS capable
mobile distribution from all mobiles. E.g. the number of Streaming Traffic
class capable phones and cells has a direct relatio how extensive impact EQoS
has on existing network. </p>


<p>Considering this, radio resource planning has to be accurate to support
data services in the network while maintaining Grade of Service for Voice.</p>


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<h3>Coverage and Frequency Planning</h3>

<p>The network planning is usually separated to coverage, frequency and
capacity planning. The maximum achievable data rate of a cell is heavily depending
on signal level (coverage) and C/I ratio (frequency allocation), but these
items are rather the scope of GSM network planning.</p>


<p>If the appropriate field strength and C/I ratio are achieved, the next
activity in network planning is to provide the required capacity for EQoS
users.</p>
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