oeo102010 lte eran2.1 idle mode behavior issue 1.02

8/10/2019 Oeo102010 Lte Eran2.1 Idle Mode Behavior Issue 1.02

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Confidential Information of Huawei. No Spreading Without Permission

LTE eRAN2.1 Idle Mode Behavior


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PLMN selection

Used to ensure that the PLMN selected by the UE provides services properly. System information reception

The network broadcasts the network information to the UE that camps on the cell. Upon

reception of broadcast information, the UE obtains the network information and takes

actions accordingly.

Cell selection and reselection

Used to ensure that the UE finds a suitable cell to camp on.

Location registration

This procedure is used by the UE to report its status to the network. This procedure is of

two types: periodical location registration and the location registration necessitated by

changes in the location area.

Paging procedure

Used for the network to send paging messages to a UE which is in idle mode, CELL_PCH

state, or URA_PCH state.

Access procedure

From the view of access stratum, access is the procedure the UE shift from idle mode toconnected mode.


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A PLMN identity consists of a Mobile Country Code (MCC) and a Mobile Network Code

(MNC).

When a UE is powered on or recovers from lack of coverage, after the cell search, the UE

first selects the last registered PLMN and attempts to register on that PLMN. If the

registration on the PLMN is successful, the UE shows the selected PLMN on the display,

and now it can obtain service from an operator. If the last registered PLMN is unavailable

or the registration on the PLMN fails, another PLMN can be automatically or manually

selected according to the priorities of PLMNs stored in the USIM.

Several PLMN concepts are defined:

Equivalent PLMN List:The Equivalent PLMN (EPLMN) list is a list of PLMNsconsidered as equivalent to the local network by the UE in terms of service

provisioning. During PLMN selection, the UE preferentially selects a PLMN from the

list. The EPLMN list is sent from the EPC and stored in the UE.

Home PLMN: The Home PLMN (HPLMN) is the PLMN in which the UE is defined.

Each UE belongs to only one HPLMN.

Visited PLMN: The Visited PLMN (VPLMN) is the PLMN where the UE is located. A

VPLMN can be the HPLMN.




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Cell search is a procedure in which a UE achieves time and frequency synchronization with

a cell, obtains the physical cell ID, and learns the signal quality and other information about

the cell based on the physical cell ID. Before PLMN selection, a UE performs a cell search

on all carrier frequencies.

By monitoring the synchronization signal, UE gets the frame synchronization, and then, UE

can measure the reference signal and read the BCH.


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The cell search procedure is as follows:

The UE listens to the P-SS to achieve clock synchronization with a maximumsynchronization error of 5 ms. Physical cell IDs have a one-to-one correspondence

with primary synchronization signals. Therefore, the UE acquires the physical cell ID

by monitoring the P-SS

The UE listens to the S-SS to achieve frame synchronization, that is, time

synchronization with the cell. Cell ID groups have a one-to-one relation with

secondary synchronization signals. Therefore, the UE acquires the number of the

cell ID group to which the physical cell ID belongs by monitoring the S-SS.

The UE listens to the downlink reference signal to acquire the signal quality in thecell.

The UE listens to the Broadcast Channel (BCH) to acquire other information about

the cell.

The P-SS and S-SS of a cell is determained by the site ID - NID(1)and sector ID - NID(2), NID(1)

and NID(2) can be calculated by the physical cell ID-NIDcell.




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Parameter ID Description

PhyCellIdIndicates the physical cell ID, which can be reused and configuredaccording to planning. The range of Physical Cell ID is 0~503


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PLMN Selection in Automatic Mode

When a UE fails to register on its last registered PLMN, the UE attempts to select

another PLMN. In automatic network selection mode, the UE selects a PLMN in the

following order:

HPLMN or an EHPLMN

Each PLMN in the "User Controlled PLMN Selector with Access Technology"

data file in the USIM, in order of priority, according to the UE's support for

Radio Access Technologies (RATs)

Other PLMNs with signals of high received quality, in a random order. The

high quality of signals is defined as the Reference Signal Received Power

(RSRP) of a cell in the PLMN being greater than or equal to -110 dBm.

Other PLMNs in order of decreasing signal quality

When the UE finds a suitable cell in a PLMN during the preceding procedure, the

UE attempts to register on the PLMN. If the registration is successful, the UE camps

on the suitable cell; otherwise, the UE tries the next PLMN.

If the registration on none of the PLMNs is successful, the UE enters the limited

service state. If no PLMN is available, the UE cannot obtain any service.

PLMN Selection in Manual Mode

When a UE fails to register on its last registered PLMN, the UE attempts to selectanother PLMN. In manual network selection mode, the UE displays a list of PLMNs,

in the same order as the PLMNs to be selected in automatic network selection

mode.

In manual mode, the UE can also try forbidden PLMNs. If the UE succeeds in

registering on the selected PLMN, the PLMN is no more a forbidden PLMN to the

UE. The forbidden PLMNs are determined by the EPC.

Roaming

When in roaming state, a UE obtains service from a VPLMN that is different from

its HPLMN. For example, the UE obtains service from a PLMN in another country

(that is, from an international roaming area). When the UE with the roaming

service moves out of the coverage area of its HPLMN, the UE can obtain service

from another PLMN according to the PLMN information stored in the USIM. The

operator determines whether roaming is allowed for a UE.

After the UE registers on a VPLMN by roaming, it periodically searches for its

HPLMN and attempts to return to the HPLMN. The time interval between

consecutive searches for the HPLMN is defined by the operator and stored in theUSIM.




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After selecting a PLMN, a UE selects a cell in the PLMN to camp on. When camped on the

cell, the UE monitors system information, performs measurements on the serving cell and

neighboring cells, and selects a better cell to camp on, according to measurement rules

and cell reselection criteria.

UE performs this procedure according to the selection or reselection related parameters in

the system information or in the RRC Connection Release message.

A UE can use one of the following two cell selection procedures: Stored Information Cell

Selection and Initial Cell Selection. The Stored Information Cell Selection procedure takes

precedence over the Initial Cell Selection procedure. The UE uses the latter procedure only

when it fails to find a suitable cell by using the former procedure.




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During cell selection, a UE needs to check whether a cell fulfils the cell selection criteria.

The cell selection is based on the RSRP of the E-UTRAN cell. Before a UE can select a cell to

camp on, the RSRP of the cell must be higher than the user-defined minimum receive (RX)

level Qrxlevminof the cell.

The formula for cell selection decision is as follows:

Srxlev > 0

where Srxlev = Qrxlevmeas - (Qrxlevmin + Qrxlevminoffset) - Pcompensation



Parameter

Description

Qrxlevmeas Received RS level

Qrxlevmin Minimal Required Rx level (dBm) in SIB1

Qrxlevminoffset Offset to Srxlev, relative with PLMNpriority ,.QrxlevminOffset is only applied when a cell isevaluated for cell selection as a result of a periodic searchfor a higher priority PLMN while camped normally in aVPLMN in SIB1

Pcompensation max (PMaximum allowed powerPUE MAX Output Power, 0), where

PMaximum allowed power is sent in SIB1


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QrxlevminIndicates the minimum required RX level. This parameter is used in

the formula of the cell selection criterion S.

Qrxlevminoffset

Indicates the minimum required RX level offset. This parameter isused in the formula of the cell selection criterion S. This parameter ischecked only when the UE is staying in the VPLMN and the cellselection is triggered by the periodically searching high priorityPLMN.


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PMaxCfgInd

Indicates whether to configure the the maximum TX power of the

UE in the intra-frequency neighboring cell. Recommended value isNOT_CFG

PMaxIndicates the maximum TX power of the UE in the cell. If thisparameter is not included in the SIB3, the UE uses the maximum TXpower.


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UE cell reselection include two steps:

Start the measurement for the neighboring cells Rank the measured cells based on radio signal quality and priorities.


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If the intra frequency measurement triggering threshold is configured, in case of the

measured serving cell signal quality is lower than the threshold , UE start the intra

frequency measurement to search for a better neighbor.




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From SIB ,UE can get the serving cell and inter frequency/RAT neighbors priorities.

For the high priority cells, UE measure them always, for the low priority cells, UE measurethem in case of the serving cell signal is lower than the threshold.

The intra frequency cells have the same frequency priority, frequencies of different RATs

must have different priorities.




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Frequencies of different RATs must have different priorities.

The priorities of E-UTRAN frequencies and inter-RAT frequencies are classified into thefollowing types:

Absolute priority: This priority is specified by the CellReselPriorityparameter and

is sent to UEs through broadcast of system information.

Dedicated priority: This priority is UE-specific. Dedicated priorities are generated by

the internal dedicated prioritization algorithm or generated based on a Subscriber

Profile ID (SPID) when a UE releases radio resources. They are sent to the UE

through the RRC Connection Release message. The validity time of dedicated

priorities is defined by the timer T320ForLoadBalanceor T320ForOther, whichis sent to the UE through the RRC Connection Release message.

During cell reselection, when a UE is camped on a suitable cell, the UE ignores all the

absolute priorities provided in system information if dedicated priorities are assigned

through dedicated signaling. If the UE acquires the priorities of other frequencies but no

priority of the serving frequency, the UE regards the priority of the serving frequency as the

lowest.




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CellReselPrio

Indicates the cell reselection priority of the serving frequency. 0

indicates the lowest priority. This parameter is the networkingplanning parameter and needs to be planned in all frequency layers.


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CellReselPriorityInd

Indicates whether to set the priority of the EUTRAN frequency for

inter-frequency cell reselection. This switch is not configured bydefault.

CellReselPriority

Indicates the priority of the EARFCN for inter-frequency cellreselection. The value 0 indicates the lowest priority. If thisparameter is not set, the lowest priority applies by default. Thisparameter is contained in SIB5. This priority is not configured bydefault.


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CellReselPriorityIndIndicates whether the inter-RAT UTRAN reselection priority

parameter is configured. This switch is not configured by default.

CellReselPriority

Indicates the priority of the inter-RAT UTRAN frequency. The value 0indicates the lowest priority. If this parameter is not set, the lowestpriority applies by default. This parameter is contained in SIB6. Thispriority is not configured by default.


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CellReselPriorityInd

Indicates whether the GERAN frequency group for inter-RAT cell

reselection priority parameter is configured. This switch is notconfigured by default.

CellReselPriority

Indicates the priority of GERAN frequency group for inter-RAT cellreselection. The value 0 indicates the lowest priority. If thisparameter is not set, the lowest priority applies by default. Thisparameter is contained in SIB7. This priority is not configured bydefault.


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T320ForLoadBalance

Indicates the length of timer T320 that is configured in

the case of load balancing. It refers to the time period during which

the dedicated priorities (used for cell reselection) retain valid.

The time period is contained in the RRCConnectionRelease message that

is received by the UE. After the timer specified in the

RRCConnectionRelease

message expires, the dedicated priorities become invalid.

T320ForOther

Indicates the length of timer T320 that is configured in

the case of load imbalancing. It refers to the time period during

which the dedicated priorities (used for cell reselection) retainvalid. The time period is contained in the RRCConnectionRelease message

that is received by the UE. After the timer specified in the

RRCConnectionRelease

message expires, the dedicated priorities become invalid.


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Qhyst

Indicates the hysteresis to the RSRP of the serving cell used in the

evaluation of cell reselection. The setting of this parameter isrelevant to the slow fading characteristic of the cell. That is, thegreater the variance of slow fading is, the larger the value of thehysteresis should be. Thus, the edge of the serving cell becomeslarger, and the neighboring cell becomes harder to be selected.


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CellQoffset

(MODEUTRANINTRAFREQNCELL)

Indicates the cell specific offset between the serving cell and

the intra-frequency neighboring cell that is related totriggering of cell reselection. The larger the value of thisparameter is, the less possibly the cell reselection occurs. Thisparameter is contained in SIB4.

CellQoffset

(MODEUTRANINTERFREQNCELL)

Indicates the cell specific offset between the serving cell andthe inter-frequency neighboring cell that is related totriggering of cell reselection. The larger the value of thisparameter is, the less possibly the cell reselection occurs. Thisparameter is contained in SIB5.


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If the highest priority cell is unsuitable because it is part of the list of forbidden TAs for

roaming or it does not belong to the registered PLMN or an EPLMN, the UE does not

consider this cell as a candidate for reselection for a maximum of 300 seconds.




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TReselEutran

Indicates the cell reselection duration of the E-UTRAN. When

the signal quality of the new cell is better than the servingcell all the time and the UE stays in the current serving cellfor more than 1s, the UE is initiating cell reselection requestto the new cell. The smaller the parameter is, the easier thecell reselection from the serving cell is triggered, and themore possibly that the pingpong reselection occurs. Thebigger the parameter is, the more difficult the cell reselectionfrom the serving cell is triggered, and the less possibly thatthe pingpong reselection occurs.


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ThreshXhigh

Indicates the high priority reselection threshold of the inter-

frequency EARFCN. It is used to control the difficulty level of thereselection of the inter-RAT UTRAN cell with the high-priorityEARFCN. The larger the value of this parameter, the more difficultthe reselection is.


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ThreshXhigh(MOD GERANNFREQGROUP)

Indicates the high priority reselection threshold of the inter-RAT

GERAN ARFCN. It is used to control the difficulty level of thereselection of the high priority inter-RAT GERAN ARFCN. Thelarger the value of this parameter, the more difficult thereselection is.

ThreshXhigh

(MOD UTRANNFREQ)

Indicates the high priority reselection threshold of the inter-RATUTRAN frequency. It is used to control the difficulty level of thereselection of the high priority inter-RAT UTRAN frequency. Thelarger this value is set, the more difficult the reselection is


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ThrshServLow

Indicates the low priority inter-frequency/inter-RAT reselection

threshold of the serving frequency. This parameter is applied toscenarios of deciding the low priority inter-frequency/inter-RATreselection of the UE. The condition of this scenario is: Cells of thesame serving frequency and cells of high-priority frequency fail tomeet inter-frequency/inter-RAT reselection criteria. The greaterthe value is, the more possibly the reselection to the low prioritycell occurs.


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ThreshXlow

(MOD GERANNFREQGROUP)

Indicates the low priority reselection threshold of the inter-RAT

GERAN ARFCN. It is used to control the difficulty level of thereselection of the low priority inter-RAT GERAN ARFCN. The largerthe value of this parameter, the more difficult the reselection is.

ThreshXlow

(MOD UTRANNFREQ)

Indicates the low priority reselection threshold of the inter-RATUTRAN frequency. It is used to control the difficulty level of thereselection of the low priority inter-RAT UTRAN frequency. Thelarger this value is set, the more difficult the reselection is.


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Based on the contents of the System Information (SI) messages, SI is divided into one

Master Information Block (MIB) and 11 System Information Blocks (SIBs). SI messages are

transmitted over the BCCH.

The scheduling period and transport format of the MIB is predefined ,therefore, the UE

receives the MIB on the BCH without obtaining other information on the network.

The SIB1 is transmitted over the Downlink Shared Channel (DL-SCH), the scheduling period

of the SIB1 is 80 ms.

The SIB1 carries the scheduling period information of other SIBs.

Other SIBs are transmitted over the DL-SCH also, and the scheduling periods can be

separately set. The SIBs with the same scheduling period can be transmitted together.




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The MIB is transmitted over the BCH. The scheduling period of the MIB is 40 ms. The first

transmission of the MIB is scheduled in subframe 0 of radio frames for which the SFN mod

4 = 0, and repetitions are scheduled in subframe 0 of the last three radio frames in each

period.




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SIB1 is mandatory SIB and send in DL-SCH

The scheduling period of the SIB1 is fixed to 80 ms. The first transmission of the SIB1 isscheduled in subframe 5 of radio frames for which the SFN mod 8 = 0, and repetitions are

scheduled in subframe 5 of the later radio frames for which SFN mod 2 = 0 in each period.




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SiMapIndIndicates whether the mapping from SIBs to SI messages is

enabled.

SibxPeriod(x=2,3,4,5,6,7,8)Indicates the transmission period of SIBx(x=2,3,4,5,6,7,8). The SIBswith the same transmission period can be mapped to the same SI.


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After obtaining the SI message properly, the UE does not read the message repeatedly. It

updates the SI message only in the following scenarios:

The UE receives the SI message change notification in the paging message

transmitted from the eNodeB.

The UE receives the ETWS (ETWS: Earthquake and Tsunami Warning System)

message broadcast notification in the paging message transmitted from the

eNodeB.

The UE receives the SI message 3 hours after receiving an SI message.

The modification period of the SI message is Nradio frames, and the period starts from

radio frames for which SFN mod n= 0. During the nmodification period, the eNodeBtransmits the paging message to inform UEs in RRC_IDLE mode and UEs in

RRC_CONNECTED mode about the SI message change when a paging cycle arrives. When

the n+1 modification period arrives, the eNodeB transmits the updated SI message.




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The modification period of the SI message is Nradio frames, and the period starts from

radio frames for which SFN mod n= 0. During the nmodification period, the eNodeB

transmits the paging message to inform UEs in RRC_IDLE mode and UEs in

RRC_CONNECTED mode about the SI message change when a paging cycle arrives. When

the n+1 modification period arrives, the eNodeB transmits the updated SI message.

The length of the SI modification period n= ModifyPeriodCoeffx DefaultPagingCycle

where:

ModifyPeriodCoeffis the coefficient of the modification period, indicating the

minimum number of interceptions on the paging messages for the UE in the SI

message modification period. DefaultPagingCycleis the default paging cycle in the unit of radio frames.

ModifyPeriodCoeffand DefaultPagingCycleare broadcast in the SIB2.




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ModifyPeriodCoeff

(MOD BCCHCFG)

Indicates the modification period coefficient for the BCCH.ModifyPeriod = ModifyPeriodCoeff x defaultPagingCycle, whereModifyPeriod means the BCCH modification period (unit: radioframe), ModifyPeriodCoeff means the modification periodcoefficient for the BCCH, and defaultPagingCycle means thedefault paging cycle (unit: radio frame).

DefaultPagingCycle

(MOD PCCHCFG)

Indicates the default paging period. It is also called DRX period. Ifthe EPC specifies the DRX period, this parameter is compared withthe DRX period specified by the EPC. The UE uses the smaller onebetween the two DRX periods. If the EPC does not specify the DRXperiod, the period is specified by this parameter, whose value is

delivered to the UE with the system information.


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The TA is a concept introduced to the LTE/SAE system for location management of UEs.

The EPC sends paging messages to all eNodeBs in the TA. A TA is identified by a Tracking

Area Identity (TAI), which consists of the MCC, MNC, and Tracking Area Code (TAC).

eNodeB broadcast the tracking area code by SIB1.

A UE informs the EPC of its Tracking Area (TA) by TA registration. There are two ways for

the UE TA registration:

Attach/Detach

TA update

When a UE needs to obtain service from a network but is not registered to the network,

the UE performs an Attach procedure for TA registration.

After a successful Attach procedure, the UE is allocated an IP address. The Mobile

Equipment Identity (MEI) of the UE will be sent to the Mobility Management Entity (MME)

for authentication.

When the UE fails to access the EPC or the EPC does not allow the access of the UE, a

Detach procedure is initiated. After the Detach procedure, the EPC no longer pages the UE.




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TACIndicates the tracking area code of the cell. It uniquely identifies atracking area within a PLMN.


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UEs in RRC_IDLE mode use DRX to receive paging messages in order to reduce power consumption.

The eNodeB may have to buffer the paging message until a UEs paging occasion occurs.

The time positions of paging messages are fixed on the Uu interface, which are indicated by the

Paging Frames (PFs) and Paging Occasion (PO) subframes. One PF is one radio frame, which may

contain one or multiple Pos. One PO is a subframe where the Paging Radio Network Temporary

Identifier (P-RNTI) is contained. The PO is transmitted over the PDCCH. UEs read paging messages

over the Physical Downlink Shared Channel (PDSCH) according to the P-RNTI.

The PF number and PO subframe number can be calculated according to the IMSI of the UE, DRX

cycle, and number of PO subframes in a DRX cycle. Frame numbers are stored in the SI related to

the DRX parameters of the UE. When the DRX parameters change, PF number and PO subframe

number change accordingly.

The SFN of a PF is derived from the following formula:

SFN mod T = (T div N) x (UE_ID mod N)

The subframe number i_s of a PO is derived from the following formula:

i_s =Floor (UE_ID/N) mod Ns




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NsPO when

i_s=0

PO when

i_s=1

PO when

i_s=2

PO when

i_s=3

1 0 N/A N/A N/A

2 0 5 N/A N/A

4 0 1 5 6

NsPO when

i_s=0

PO when

i_s=1

PO when

i_s=2

PO when

i_s=3

1 9 N/A N/A N/A

2 4 9 N/A N/A

4 0 4 5 9

FDD Subframe Patterns:

TDD Subframe Patterns

For FDD and TDD, the PO subframe patterns are different, because for TDD mode, some of

the subframes are of uplink.


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In each DRX cycle, a UE monitors one P-RNTI transmitted on the PDCCH only in this PO

and reads the paging messages on the PDSCH. Different UEs may have the same PO. If UEs

are paged by the MME in the same PO, the paging records must be combined into the

same paging message in RRC layer . When certain UE-specific paging and group paging

triggered by change of an SI message occur simultaneously, the paging messages must

also be combined in RRC layer .




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Parameter description



MO Parameter

ID

Description

EutranIntra

FreqNCell

CellQoffset Indicates the cell specific offset between the serving cell and the intra-frequency neighboring cell that is related to triggering

of cell reselection. The larger the value of this parameter is, the less possibly the cel l reselection occurs. This parameter is

contained in SIB4. For details, see 3GPP TS 36.331.CellResel CellReselPrio

rity

Indicates the reselection priority of the cells assigned with the same frequency as the serving one. 0 indicates the lowest

priority. The value of this parameter must be determined together with the priorities of other frequencies during the network

planning.

PCCHCfg DefaultPagi

ngCycle

Indicates the default paging cycle of the cell, which is also referred to as the default DRX cycle. If the EPC indicates a DRX

cycle, the UE uses the shorter one between the default cycle and the cycle indicated by the EPC. If the EPC does not indicate a

DRX cycle, the cycle specified by this parameter is used and sent to the UE through the system information. For details, see

3GPP TS 36.304.

The larger the value of this parameter is, the more power-efficient the UE is, but the longer the paging response delay is.

BcchCfg ModifyPerio

dCoeff

Indicates the modification period coefficient for the BCCH. ModifyPeriod = ModifyPeriodCoeff x defaultPagingCycle, where

ModifyPeriod means the BCCH modification period (unit: radio frame), ModifyPeriodCoeff means the modification period

coefficient for the BCCH, and defaultPagingCycle means the default paging cycle (unit: radio frame).

PCCHCfg NB Indicates the number of paging occasions (subframes or times of paging) contained in a paging cycle.

For details, see 3GPP TS 36.304.

Cell PhyCellId Indicates the physical cell ID. For details, see 3GPP TS 36.331.

CellResel PMax Indicates the maximum TX power of the UE in the cell. If this parameter is not included in the SIB3, the UE uses the maximum

TX power.

CellResel Qhyst Indicates the hysteresis for the RSRP measurement on the serving cell, which is used during the evaluation of cell reselection.

This parameter must be set on the basis of the slow fading characteristic of the area covered by the cell. That is, the greater

the slow fading variance is, the larger the value of the hysteresis should be. A larger value of the hysteresis results in a bigger

boundary of the serving cell and a higher probability of cell reselection to neighboring cells.

DB0_Q_HYST means 0dB of hysteresis. DB1_Q_HYST means 1dB of hysteresis.

CellSel Qrxlevmin Indicates the minimum required RX level for the cell to become a candidate during cell selection. This quantity is included in

criteria S and used in the evaluation of cell selection.CellSel Qrxlevminof

fset

Indicates the offset of the minimum required RX level. The quantity is included in criteria S and used in the evaluation of cell

selection. This parameter is valid only when the cell selection is triggered by periodic searching for high-priority PLMNs.

CellSiMap Sib2Period Indicates the transmission period of SIB2. The SIBs with the same transmission period can be mapped to the same SI.







CellResel SIntraSearch Indicates the measurement triggering threshold for reselection to intra-frequency cells. The step is 2 dB.

The UE starts intra-frequency measurements only when the signal quality in the serving cell is lower than or equal to the value

of this parameter.

CellResel SIntraSearch

CfgInd

Indicates whether to configure the measurement triggering threshold of the intra-frequency cell reselection.

When the parameter is set to CFG, the measurement triggering threshold of the intra-frequency cell reselection is configured.

When the parameter is set to NOT_CFG, the measurement triggering threshold of the intra-frequency cell reselection is not

configured.

CellResel SNonIntraSe

arch

Indicates the measurement triggering threshold for the reselection of the inter-frequency/inter-RAT cell. The step is 2.

When the reselection priority is higher than the serving frequency of the inter-frequency/inter-RAT, the UE always triggers the

measurement.

If the reselection priority of the inter-frequency is less than or equal to the serving frequency or when the reselection priority

of the inter-RAT is less than the serving frequency, the UE does not trigger the inter-frequency/inter-RAT measurement when

the signal quality of the serving cell is higher than this parameter, and triggers the inter-frequency/inter-RAT measurement

when the signal quality of the serving cell is lower than this parameter.

CellResel SNonIntraSe

archCfgInd

Indicates whether to configure the measurement triggering threshold of the inter-frequency/inter-RAT cell reselection.

When the parameter is set to CFG, the measurement triggering threshold of the inter-frequency/inter-RAT cell reselection is

configured. When the parameter is set to NOT_CFG, the measurement triggering threshold of the inter-frequency/inter-RAT

cell reselection is not configured.


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Parameter description



MO Parameter

ID

Description

RRCConnState

Timer

T320ForLoad

Balance

Indicates the length of timer T320 for load balancing. T320 specifies the time period during which the dedicated

priorities (used for cell reselection) retain valid. The time period is contained in the RRCConnectionRelease message

that is received by the UE. After T320 expires, the dedicated priorities become invalid.This timer is started when the UE receives an RRCConnectionRelease message containing the t320 IE.

This timer is stopped when the UE enters the RRC_CONNECTED mode.

RRCConnState

Timer

T320ForOthe

r

Indicates the length of timer T320 for a reason other than load balancing. T320 specifies the time period during

which the dedicated priorities (used for cell reselection) retain valid. The time period is contained in the

RRCConnectionRelease message that is received by the UE. After T320 expires, the dedicated priorities become

invalid.

This timer is started when the UE receives an RRCConnectionRelease message containing the t320 IE.

This timer is stopped when the UE enters the RRC_CONNECTED mode.

GeranNfreqGro

up

ThreshXHigh Indicates the threshold for reselection to a GERAN neighboring cell assigned with the higher priority carrier

frequency group. It is used to control the difficulty level of reselection to the GERAN neighboring cell. That is, the

larger the value of this parameter, the more difficult the reselection is. For details, see 3GPP TS 36.331.

Cdma2000Ban

dClass

ThreshXHigh Indicates the threshold for reselection to a CDMA200 cell assigned with the higher-priority CDMA2000 band class.


UtranNFreq ThreshXHigh Indicates the threshold for reselection to a UTRAN cell assigned with the higher-priority ARFCN. It is used to control

the difficulty level of reselection to the UTRAN cell. That is, the larger this value is set, the more difficult the

reselection is. For details, see 3GPP TS 36.331.

EutranInterNFr

eq

ThreshXHigh Indicates the threshold for reselection to an inter-frequency cell assigned with the higher-priority EARFCN. It is used

to control the difficulty level of reselection to the inter-frequency cell. That is, the larger the value of this parameter,

the more difficult the reselection is. For details, see 3GPP TS 36.331.

GeranNfreqGro

up

ThreshXLow Indicates the threshold for reselection to a GERAN cell assigned with the lower-priority carrier frequency group. It is

used to control the difficulty level of the reselection to the GERAN cell. That is, the larger the value of this parameter,


Cdma2000Ban

dClass

ThreshXLow Indicates the threshold for reselection to a CDMA2000 cell assigned with the lower-priority CDMA2000 band class.


UtranNFreq ThreshXLow Indicates threshold for reselection to a UTRAN cell assigned with the lower-priority ARFCN. It is used to control the

difficulty level of reselection to the UTRAN cell. That is, the larger the value of this parameter, the more difficult the

reselection is. For details, see 3GPP TS 36.331.

EutranInterNFr

eq

ThreshXLow Indicates the threshold for reselection to an inter-frequency cell assigned with the lower priority EARFCN. It is used

to control the difficulty level of reselection to the inter-frequency cell. That is, the larger the value of this parameter,


CellResel ThrshServLowIndicates the low priority inter-frequency/inter-RAT reselection threshold of the serving frequency. This parameter is

applied to scenarios of deciding the low priority inter-frequency/inter-RAT reselection of the UE. The condition of this

scenario is: Cells of the same serving frequency and cells of high-priority frequency fail to meet inter-frequency/inter-

RAT reselection criteria. The greater the value is, the less possibly the reselection to the low priority cell occurs.

CellResel TReselEutran Indicates the cell reselection duration of the E-UTRAN. When the signal quality of the new cell is better than theserving cell all the time and the UE stays in the current serving cell for more than 1s, the UE is initiating cell

reselection request to the new cell . The smaller the parameter is, the easier the cell reselection from the serving cell

is triggered, and the more possibly that the pingpong reselection occurs. The bigger the parameter is, the more

difficult the cell reselection from the serving cell is triggered, and the less possibly that the pingpong reselection

occurs.

CellReselGeran TReselGeran Indicates the cell reselection duration of GERAN cell reselection. When the signal quality of the serving cell is lower

than the low priority reselection threshold all the time and the signal of the new cell is higher than the low priority

reselection threshold all the time, and the UE stays in the current serving cell for more than 1s, then the UE is

initiating cell reselection request to the new cell. The lower the parameter is, the easier it is for the UE to initiate cell

reselection. However, the Ping-Pong reselection probability is increased. The higher the parameter is, the harder it is

for the UE to initiate cell reselection. The Ping-Pong reselection probability, however, is reduced.

CellReselUtran TReselUtran Indicates the cell reselection duration of UTRAN cell reselection. When the signal quality of the serving cell is lower

than the low priority reselection threshold all the time and the signal of the new cell is higher than the low priority

reselection threshold all the time, and the UE stays in the current serving cell for more than 1s, then the UE is

initiating cell reselection request to the new cell. The lower the parameter is, the easier it is for the UE to initiate cell

reselection. However, the Ping-Pong reselection probability is increased. The higher the parameter is, the harder it is

for the UE to initiate cell reselection. The Ping-Pong reselection probability, however, is reduced.


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oeo102010 lte eran2.1 idle mode behavior issue 1.02

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