3g Radio Parameter Ericsson
Radio 3G Parameter for Ericson...
3G Ericsson Radio Parameter TELKOMSEL
Prepared by Adithya Yudha
Contents Idle Mode Handover Power Control Capacity Management Channel Switching HSDPA
Idle Mode and Common Channel behavior
Cell Selection 3G part Criteria for Cell Selection Squel > 0 , Squal = Qqualmeas-qQualMin (only for WCDMA cells) and Srxlev > 0 , Srxlev = Qrxlevmeas-qRxLevMin - Pcompensation (for all cells) Pcompensation = max (maxTxPowerUl - P, 0)
Qqualmeas > qQualMin (-18dB) and Qrxlevmeas > qRxLevMin (-115dBm) - max (maxTxPowerUl (24dB) - P, 0)
qQualMin : indicates the minimum required quality value in the cell. It is sent in system information, in SIB3 for the serving cell, and in SIB11 for adjacent cells qRxLevMin : indicates the minimum required signal strength in the cell. It is sent in SIB3 for the serving cell and in SIB11 for adjacent cells maxTxPowerUl : indicates the maximum allowed transmission power when the UE accesses the system on RACH. It is broadcast in SIB3
Cell Selection 3G part Squal > 0
Qqualmeas (dB) (CPICH Ec/N0)
Squal >0 AND Srxlev > 0
qQualMin (–18) Squal = Qqualmeas – qQualMin
qRxLevMin (–115) suitabl e cell?
Qrxlevmeas (dBm) CPICH RSCP
Pcompensation Pcompensation = max(maxTxPowerUl – P, 0) (dB)
Srxlev = Qrxlevmeas - qRxLevMin – Pcompensation
Srxlev > 0
Cell Reselection 3G part First according to S criteria Squal > 0 (only WCDMA cells) Srxlev > 0 The cells are ranked according to the R criteria: R(serving) = Qmeas(s) + qHyst(s) R(neighbor) = Qmeas(n) - qOffset(s,n) qHyst1 : Based on CPICH RSCP qHyst(s) qHyst2 : Based on CPICH Ec/No qOffset1sn : Based on CPICH RSCP qOffset(s,n)
qOffset2sn : Based on CPICH Ec/No (1 ) qHyst(s) and qOffset(sn) based on CPICH RSCP only
(2 ) With this setting the UE first makes qHyst(s) and qOffset(sn) based on CPICH RSCP . If a GSM cell is highest ranked, no more ranking is done. If a WCDMA neighbor is highest ranked, a second ranking takes place, this time according to CPICH Ec/No, and excluding all GSM neighbors
Cell Reselection 3G part R CRITERIA : R(serving) = Qmeas(s) + qHyst(s) R(neighbor) = Qmeas(n) - qOffset(s,n) Note that parameter qOffset1sn works identically for WCDMA-GSM and WCDMA-WCDMA neighbor relations. But the values of GSM RSSI and WCDMA CPICH RSCP are not of the same nature and therefore not directly comparable. [CPICH RSCP] = [GSM RSSI] + 7 As an example a measured RSCP on a WCDMA CPICH of -100 dBm would be comparable to a GSM broadcast channel RSSI of -93 dBm. A parameter setting of a GSM neighbor to qOffset1sn = +7 will thus make the received signal strength in the WCDMA and the GSM cell comparable.
Cell Reselection 3G part MEASUREMENT ON INTRA AND INTER-RAT NEIGHBOR The decision about when intrafrequency measurements are performed is made using the sIntraSearch parameter in relation to Squal: • If the Squal > sIntraSearch, the UE does not need to perform intrafrequency measurements. • If the Squal sRatSearch and the Srxlev > sHcsRat, the UE does not need to perform measurements on GSM cells. • If the Squal 50% and load on target less than source by a 10 % margin) The feature is activated in an RNC by setting the parameter loadSharingRrcEnabled to TRUE f2 f2 TRUE/FALSE The attribute loadSharingCandidate specifies whether the target cell is a load-sharing neighbor of the source cell Triggered
Inter-Frequency Load Sharing (RRC redirection) (Extra Slide) RNC Idle Mode ”RRC Connection Request” CCCH/RACH F1 ”RRC Connection Reject” CCCH/FACH Cell selection on designated UTRA carrier ”RRC Connection Request” CCCH/RACH
”RRC Connection Setup” CCCH/FACH
Includes ‘Frequency Info’ IE
2nd will not be redirected but may be successful or rejected due to congestion
Directed retry to GSM Applicable for voice in P3 GSM
Directed retry to GSM
Directed retry to GSM At call set-up - RAB Establishment for voice Triggered by Downlink Transmitted Carrier Power
The feature is activated in an RNC by setting the parameter loadSharingDirRetryEnabled to TRUE
One GSM target can be defined for each WCDMA cell via the cell parameter directedRetryTarget
loadSharingGsmThreshold specifies the minimum load at which offloading to GSM begins: ex 80% of pwrAdm
loadSharingGsmFraction specifies the percentage of Directed Retry candidates to be diverted to GSM while the cell load is above the specified load threshold
Directed Retry to GSM UE
RAB Assignment Request Directed Retry decision to send
RAB Assignment Response (failed, cause=directed retry) Relocation Required Contacts GSM cell and orders relocation
HO from UTRAN command
Successful access to GSM
Iu release Command Iu release Complete
Voice calls can be relocated to GSM due to high load in WCDMA If the call is not accepted in GSM - try in WCDMA again!
Load balancing for voice between WCDMA-GSM
Features Introduction & Roadmap
When out of coverage, the WCDMA voice call is handed over to GSM
When GSM load reaches a customizable threshold, voice calls can be handed over to WCDMA
WCDMA coverage Dual Mode UE
GSM coverage Load based handover to GSM during call set up, Directed Retry (P3) to GSM
Channel Switching Parameter Summary
1. Common to Dedicated Evaluation Monitors if the UE shall be switched from a common to a dedicated transport channel due to large amount of user data buffered in the RNC or the UE.
2. Dedicated to Dedicated Up-Switch Evaluation Monitors if the throughput becomes close to the max user bandwidth and switch to the next higher bitrate radio bearer is required.
2a. Dedicated to Dedicated Coverage triggered Down-Switch Evaluation Monitors if a switch to a lower rate radio bearer is required due to coverage.
3. Dedicated to Common Evaluation Monitors if a switch from a Cell_DCH to Cell_FACH is required due to a decrease in transmitted user data.
4. Common to Idle Evaluation Monitors if a switch from Cell_FACH to Idle mode is required due to a complete lack of user data transmission.
Multi-RAB Down-switch Evaluation Monitors if a release (or downswitch) of PS I/B RAB shall be initiated due to lack of PS data throughput (zero), resulting in a single speech 12.2 kbps (or speech + PS 0/0) or CS64 RAB.
Multi-RAB Up-switch Evaluation Monitors if an upswitch from multi-RAB SP0 to multi-RAB SP64 shall be initiated due to data buffered in either RNC or UE.
Future releases stand-alone interactive RAB
speech + interactive RAB
speech + 384/HS
64/384 speech + 64/HS
speech + 64/64
speech + 0/0
Low/No throughput Measurement for down Switch timer period FACH
Low/No RLC buffer load for Inactivity timer period
PS RAB Establishment
UL throughputbased upswitch
activity/inactivity-based switching UL and/or DL
coverage-triggered downswitch (DL only)
DL throughputbased upswitch
choice based on UEand cell-capability
Admission control workflow Resource request
* Current default values Yes, then block
Is admission blocked by Congestion Control?
No, then accept
Yes, then block
Check if the requested + estimated # compressed mode RL > compModeAdm
No Yes, then block
Check if the requested code usage + estimated code usage > dLCodeAdm
Check if the requested ASE UL + estimated ASE UL > aseUlAdm
Only checked if No BE-service requests Check if the requested Check if the requested DL SF + estimated DL SF ASE DL + estimated DL ASE > > No sfXAdm * aseDlAdm
Yes, then SF8adm= 8* block SF16adm= 16* SF32adm= 32*
Yes, then block
Check if the requested DL Pwr + estimated Pwr > pwrAdm
•X = 8 or X = 32 •X = 16
160* Yes, then block
Yes, then block
Soft Congestion mechanism New request for ng 64/128, ng 64/64 or g access
Admission Control blocks the new request
An existing ng user of 64/384 will be switched down to 64/128 or an existing ng user of 64/128 will be switched down to 64/64
Spreading Factor (SF) limits used in Admission Control
* Current default values
ASE release order Core Network
SRNC & DRNC
Non-guaranteed service class connections
Non-guaranteed service class connections
CS/streaming service class connections
CS /streaming service class connections
HSDPA Parameter Summary Parameter Name
CQIERRORSABSENT HSPOWERMARGIN HSSCCHMAXCODEPOWER QUEUESELECTALGORITHM SUPPORTOF16QAM
Initial Setting TELKOMSEL
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 maximum 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.
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 RLC Level As a Function of the UE HS-DSCH Category and Modulation Type