Download 3g-Radio-Parameter-Rev-01.pdf PDF

TagsSoftware Defined Radio Networks Telecommunications Standards High Speed Packet Access Bit Rate
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Total Pages82
Document Text Contents
Page 1

3G Ericsson

Radio Parameter


Prepared by Adithya Yudha

Page 2


 Idle Mode

 Handover

 Power Control

 Capacity Management

 Channel Switching


Page 41

Event 1c, A non-activEvent 1c, A non-active primary e primary CPICH becomes better than CPICH becomes better than an Aan Active Primaryctive Primary


Soft/Softer Handover

When a P-CPICH, not included in the

Active Set, becomes stronger than the

P-CPICH+hyP-CPICH+hysteresis1c steresis1c /2/2 in the Active

Set during a time at least equal to

timeToTrigger1c,and the Active Set is full

(present cells in the Active Set is equal to

maxActiveSetmaxActiveSet parameter) event 1c

occurs. The UE sends a


event 1c to the SRNC. If the retained cell

is a valid cell, and the Active Set is full,

the cell is proposed as a replacement for

the weakest cell in the Active Set

(measured P-CPICH Ec/No) > (P-CPICH Ec/No of the Best Cell in the Active Set) +

hysteresis1c /2hysteresis1c /2

Cell (P_CPICH4) Would

be replaced P_CPICH3

in active set list

Hysteresis1c (1dB)Hysteresis1c (1dB)

320 ms320 ms

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Soft/Softer HandoverSoft/Softer Handover
Parameter Summary

Setting Value Remark

reportingRange1a 6 3 dB

reportingRange1b 10 5 dB

timeToTrigger1a 11 320ms
timeToTrigger1b 12 640ms

timeToTrigger1c 11 320ms

timeToTrigger1d 14 2560ms

hysteresis1a 0 0

hysteresis1b 0 0

hysteresis1c 2 1dB

hysteresis1d 15 7dB

maxActiveSet 3 3

Page 81


 The HSDPA Iub flow control algorithm adjusts the available bit rate over Iub based mainly on the
maximum possible air interface bitrate received from the scheduler, the number of users in a cell
and Iub congestion indications. The RBS uses the parameter maxHsRate to determine the
maximummaximum bit rate to be used for HS-DSCH data frame traffic in one aggregated bit pipe over Iub.

 The parameter maxHsRate should be configured for each RBS to represent the maximum MAC-d
PDU bitrate of HS-DSCH data frames, which is available for the AAL2 path or paths carrying
HSDPA traffic to the RBS in question. The parameter may be set to a MAC-d PDU bit rate of 1.5
Mbps (the default value), when one dedicated physical E1 link is used for HSDPA traffic. This
maximum bitrate level is the same as the bitrate expressed by the CAPACITY ALLOCATION
control frames.

 As an example, the default value of this parameter has been obtained by multiplying the HSDPA
available ATM bandwidth (excluding IMA overhead), e.g. 1.92 Mbps, with a factor of 0.79. This
factor is dependent on the average number of MAC-d PDUs per HS-DSCH data frame. In this
case, it is based on having 10 MAC-d PDUs (336 bits) per HS-DSCH data frame in average. It
should be noted that assuming a lower number of PDUs per data frame gives a lower factor and
vice versa.

 The parameter value of maxHsRate also depends on how the transport network is configured, e.g.
if ATM VC Cross Connect is used or if AAL2 switching is used. It depends on how the ATM VCs
etc are configured, e.g. for HS traffic only, sharing with AAL2 class A and B, several AAL2 paths
for HS etc. Therefore it is recommended to follow the guidelines given by Ericsson regarding
transport network dimensioning before setting a value for this parameter.

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16QAM Modulation16QAM Modulation

 The RBS hardware supports both QPSK and 16QAM modulation. However, support of 16QAM is

an optional feature which can be configured on cell level using the parameter supportOf16qam.

The available modulation type impacts the maximum achievable bit rate in the cell,

Maximum Achievable User Bit Rate at the Maximum Achievable User Bit Rate at the RLC Level As a RLC Level As a Function of the UE HS-DSCH Category and Modulation TypeFunction of the UE HS-DSCH Category and Modulation Type

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