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© 2006, ZTE Corporation. All rights reserved.
Contents
Various Performance Area
Types of KPI
1. Call Processing based
2. Ran Performance based
3. Coverage based
© 2006, ZTE Corporation. All rights reserved.
Various Performance Area
1. Session:
1xEV-DO Session Setup
An AT must establish a 1xEV-DO session with a DO-RNC before the AT is
allowed to access the 1xEV-DO network. During the 1xEV-DO session
setup process, an UATI is assigned. Configuration is negotiated.
A PPP session setup will also be attempted. The PPP session setup may
or may not succeed, but it will not affect the1xEV-DO session setup.
1xEV-DO Session Close
The 1xEV-DO session can be closed normally by either the AT or AN. The
1xEV-DO session will also be closed under error condition.
© 2006, ZTE Corporation. All rights reserved.
Various Performance Area2. Connection:
1xEV-DO Connection Setup
The AT originates a connection setup by sending a ConnectionRequest
message to the AN. For AT terminated connection setup, either a normal
setup or a Fast Connect can be performed. In a normal setup, the AN
pages the AT. The AT then responses with a ConnectionRequest
message. In a Fast Connect, no Page message nor ConnectionRequest
message is involved. The AN sends a TrafficChannelAssignment message
directly.
Because in a normal setup, the ConnectionRequest message is involved
in both the AT originated or AT terminated connection setup, the following
performance metrics will not distinguish between an AT origination or an
AT termination. A Fast Connect is always associated with AT terminated
connection setup.
© 2006, ZTE Corporation. All rights reserved.
1xEV-DO Connection Close
A 1xEV-DO connection can be closed by either the AT or AN. The
connection close
can be a normal close initiated by the user or as a result of inactivity. The
connection
will also be terminated when an error condition occurs.
1xEV-DO Connection Setup Performance
Connection Setup Success Rate
Defines the success rate that the 1xEV-DO connections are opened.
The Access Failure Rate
measures the RF related failure rate excluding the resource blocks and
other non-RF related failures.
Various Performance Area
© 2006, ZTE Corporation. All rights reserved.
Handoff:
Serving Sector Switching and Softer/Soft Handoff Performance
Forward Link Handoff – Virtual Handoff (Sector Switching)
In 1xEV-DO, there is no soft handoff on the forward link. The AT indicates
to the AN the sector that it has selected, and the AN does the sector
switching. On the reverse direction, there are similar softer and soft
handoffs as in 1xRTT/IS-95.
Reverse Link Soft Handoff Performance
In 1xEV-DO, reverse link soft/softer handoff is initiated by AT sending a
RouteUpdate message to request the addition or removal of pilots to its
active set. Each RouteUpdate message is counted as a handoff attempt
regardless of the number of pilots in the message. A handoff is
considered to be successful if ALL the requested pilots are added (or
removed). The handoff is considered to be failed even if only one of the
pilots is not successfully added (or removed) for any reason. The
connection will be closed when the handoff fails.
Various Performance Area
© 2006, ZTE Corporation. All rights reserved.
Paging:
Paging Performance does not measure the DO-RNC initiated dormant to
active transition performance. In Release 2.0, page retry is not
supported. When an AT fails to respond to a page, the buffered packets
will be flushed. No page retry will be attempted. If there is no more data
packet coming in, then no addition action will be taken. If the packets
keep on coming in from the A10 connection, a new page attempt will be
initiated. However this attempt is considered as a new page rather than
the retry. When the DO-RNC attempts to set up a connection to an AT, it
can perform either a normal setup involving paging the AT, or a Fast
Connect without paging the AT.
Various Performance Area
© 2006, ZTE Corporation. All rights reserved.
Control Channel (CCH)Usage:
The Control Channel (CCH) in 1xEV-DO is similar to the Paging Channel
in 1xRTT. However, the CCH is time multiplexed with the Forward Traffic
Channel (FTC), and occupies variable portion of the forward link
bandwidth depending on the CCH traffic. The forward link bandwidth
used for CCH will not be available for the FTC. Therefore, the CCH
usage has a direct impact on the possible maximum FTC throughput.
Access Channel (ACH) Usage:
The 1xEV-DO Access Channel (ACH) is very similar to the Access
Channel in 1xRTT. However, the Access Channel probe size can be
variable in 1xEV-DO. The possible number of ACH probes that can be
sent (an indication of ACH capacity) in a certain period can be variable.
As a result, an ACH occupancy may not be defined. Only statistics on the
received probes are considered
Various Performance Area
© 2006, ZTE Corporation. All rights reserved.
Various Performance Area
PPP Link (Point to Point Link Protocol):
PPP comprises of three main protocols:
1. A protocol for encapsulating datagrams over serial links
2. A Link Control Protocol (LCP) for establishing, configuring, and
testing the data-link connection
3. A family of Network Control Protocols (NCPs) for establishing and
configuring different network-layer protocols.
IPCP (IP Control Protocol) is mainly used as NCP.
© 2006, ZTE Corporation. All rights reserved.
Various Performance Area
PPP Link Establishment Steps:
In order to establish communications over a point-to-point link, each end of the PPP link must first send LCP packets to configure and test the data link.
After the link has been established and optional facilities have been negotiated as needed by the LCP, PPP must send NCP packets to choose and configure one or more network-layer protocols.
Once each of the chosen network-layer protocols has been configured, datagrams from each network-layer protocol can be sent over the link.
The link will remain configured for communications until explicit LCP or NCP packets close the link down, or until some external event occurs (an inactivity timer expires or network administrator intervention).
© 2006, ZTE Corporation. All rights reserved.
IPCP: A PPP Network Control Protocol (NCP) for IP
The IP Control Protocol (IPCP) is responsible for configuring,
enabling, and disabling the IP protocol modules on both ends of
the point-to-point link.
IPCP uses the same packet exchange machanism as the Link
Control Protocol (LCP).
IPCP packets may not be exchanged until PPP has reached the
Network-Layer Protocol phase. IPCP packets received before this
phase is reached should be silently discarded.
Various Performance Area
© 2006, ZTE Corporation. All rights reserved.
1. Call Processing KPI
2. Ran Performance KPI
3. Coverage KPI
Call Processing KPI
• 1x EV-DO Session Setup Time
• AT Initiated Connection Setup Time
• AN Initiated Connection Setup Time
• PPP Session Setup Time
• PPP Setup Failure Rate
• Round Trip Time
Ran Performance KPI
• AT Initiated Connection Setup Success Rate
• AN Initiated Connection Setup Success Rate
• Connection Drop Rate
• Reverse Link Soft/Softer Handoff Success Rate
• DRC Re-pointing Success Rate(Virtual Soft and Softer)
Coverage KPI
• SINR Distribution
• Receive Power Distribution
• Transmit Power Distribution
• DRC Distribution
• Active Set Size Distribution
• PER Distribution
Types of KPI
© 2006, ZTE Corporation. All rights reserved.
KPI 1. 1x EVDO Session Setup Time
Session Setup - Message Flow
1x EVDO
Session
Setup
Time < 6
sec for
90%
attempts
© 2006, ZTE Corporation. All rights reserved.
KPI 2. AT Initiated Connection Setup Time
AT
Initiated
Connecti
on Setup
Time <
1.5 sec
for 90%
attempts
© 2006, ZTE Corporation. All rights reserved.
KPI 3. AT Terminated Connection Setup Time
Page
AT
Terminate
d
Connectio
n Setup
Time < 5
sec for
90%
attempts
© 2006, ZTE Corporation. All rights reserved.
KPI 4. PPP Session Setup Time
PPP
Session
Setup time
< 3 sec for
90%
attempts
© 2006, ZTE Corporation. All rights reserved.
KPI 5. PPP Setup Failure Rate
KPI 6. Round Trip Time
Formula = No of Failed PPP Setup attempt/No of Total PPP Setup Attempts
ZTE System Threshold: <5%
It is the Latency time for ICMP (Internet Control Message Protocol) Payload of
various size (8 Bytes, 32 Bytes, 56 Bytes)
As per Qualcomm Standard,
For 08 Byte ICMP Payload, Average RTD = 70 – 130 msec
For 32 Byte ICMP Payload, Average RTD = 80 – 165 msec
For 56 Byte ICMP Payload, Average RTD = 90 – 200 msec
With ICMP Loss Rate <= 0.5%
© 2006, ZTE Corporation. All rights reserved.
SR NO KPI FORMULA
QUALCOMM
or ZTE
THRESHOLD
1 AT Initiated
Connection Setup
Success Rate
num of successful connection setups / num of AT
initiated connection attempts
≥95%
2 AN Initiated
Connection Setup
Success Rate
num of successful connection setups / num of
total AN Pages
≥95%
3 Connection Drop
Rate
(num of successful connection setups - num of
normal connection close) / (num of successful
connection setups)
<5%
4 Reverse Link Soft
(or softer) Handoff
Success Rate
1 - (num of failed soft(or softer) handoffs/ total
num of handoffs)
>95%
5 DRC Re-pointing
Succes Rate(Virtual
Soft and Softer)
1- (Fwd sector switching failures / (fwd sector
switching failures + fwd sector switching
successes))
>99%
© 2006, ZTE Corporation. All rights reserved.
Other Important KPI:
Other Important KPIs needs to be monitored are as follows. Its descriptions is
given in inserted excel file:
1.Quick Connect Failure Rate [%]
2.Fast Connect Failure Rate [%]
3.Connection Block Rate [%]
4.Effective Page Success Rate [%]
5.UATI Assignment Failure Rate [%]
6.Session Configuration Failure Rate [%]
7.A13 Session Transfer Failure Rate [%]
8.FL Slot Utilization including any CC transmission Histogram [%]
9.FL & RL average Sector throughput at RLP [kbps]
10.FL & RL average Sector throughput at Physical Layer [kbps]
11.Soft & Softer Handoff Failures [%]
12.Backhaul unavailability Rate [%]
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