NR Idle mode

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NR Idle mode overview

Ref: TS 38.304 V16.3.0 (2020-12)

ICL/M100

Lin, Jung-Mao

1


RRC states in NR

RRC states in NR

2

UE NG-RAN 5GCSuspend Connected

RRC_INACTIVE

UE NG-RAN 5GCConnected Connected

RRC_CONNECTED(5G Core Network)

UE NG-RAN 5GCReleased Released

RRC_IDLE

For power saving

For power saving and speed up connection setup


Outline

Cell selection/reselection procedure

General description

Cell Categories


Paging

Principles

Beam sweeping

DRX

Paging Reception

3


CELL SELECTION/RESELECTION PROCEDURE

General description

4


General descriptionThe RRC_IDLE state and RRC_INACTIVE state tasks can be subdivided into three processes:

5

•When a UE is switched on, a public land mobile network (PLMN) or a Stand-alone Non-Public Network (SNPN) is selected by NAS.

•The NAS shall provide a list of equivalent PLMNs, if available, that the AS shall use for cell selection and cell reselection.

PLMN selection

•With cell selection, the UE searches for a suitable cell of the selected PLMN or selected SNPN, chooses that cell to provide available services, and monitors its control channel. This procedure is defined as "camping on the cell".

• If the UE finds a more suitable cell, according to the cell reselection criteria, it reselects onto that cell and camps on it.

Cell selection and reselection

• If the new cell does not belong to at least one tracking area to which the UE is registered, location registration is performed.

• In RRC_INACTIVE state, if the new cell does not belong to the configured RNA, an RNA update procedure is performed

Location registration and RNA update


General descriptionThe purpose of camping on a cell in RRC_IDLE state and RRC_INACTIVE state is fourfold:

a) It enables the UE to receive system information from the PLMN or the SNPN.

b) When registered and if the UE wishes to establish an RRC connection or resume a suspended RRC connection, it can do this by initially accessing the network on the control channel of the cell on which it is camped.

c) If the network needs to send a message or deliver data to the registered UE, it knows (in most cases) the set of tracking areas (in RRC_IDLE state) or RNA (in RRC_INACTIVE state) in which the UE is camped.

It can then send a "paging" message for the UE on the control channels of all the cells in the corresponding set of areas.

The UE will then receive the paging message and can respond.

d) It enables the UE to receive ETWS and CMAS notifications.

6

ETWS: Earthquake and Tsunami Warning SystemCMAS: Commercial Mobile Alert System



Cell Categories

7


Cell CategoriesAcceptable cell:

An “acceptable cell” is a cell on which the UE may camp to obtain limited service (originate emergency calls and receive ETWS and CMAS notifications).

Such a cell shall fulfil the following requirements, which is the minimum set of requirements to initiate an emergency call and to receive ETWS and CMAS notification in an NR network:

The cell is not barred

The cell selection criteria are fulfilled

barred cell:

A cell a UE is not allowed to camp on.

A cell is barred if it is so indicated in the system information

reserved cell:

A cell on which camping is not allowed, except for particular UEs, if so indicated in the system information.

A cell is reserved if it is so indicated in system information

8


Cell Categoriessuitable cell:

For UE not operating in SNPN Access Mode, a cell is considered as suitable if the following conditions are fulfilled:

The cell is part of either the selected PLMN or the registered PLMN or PLMN of the Equivalent PLMN list and trackingAreaCode is provided for that PLMN either:

- The PLMN-ID of that PLMN is broadcast by the cell with no associated CAG-IDs and CAG-only indication in the UE for that PLMN (TS 23.501 [10]) is absent or false;

- Allowed CAG list in the UE for that PLMN (TS 23.501 [10]) includes a CAG-ID broadcast by the cell for that PLMN;

The cell selection criteria are fulfilled.

According to the latest information provided by NAS:

The cell is not barred, see clause 5.3.1;

The cell is part of at least one TA that is not part of the list of "Forbidden Tracking Areas" (TS 22.261 [12]), which belongs to a PLMN that fulfils the first bullet above.

Following exception to these definitions are applicable for UEs:

if a UE has an ongoing emergency call, all acceptable cells of that PLMN are treated as suitable for the duration of the emergency call.

9




10

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Initial Cell Selection

Any Cell Selection

go here when no

USIM in the UE and no

subscription for an SNPN

USIM inserted or SNPN

subscription added

Camped on any cell

go here whenever a new PLMN or new

SNPN is selected

1 no cell information

stored for the PLMN or the SNPN

cell information stored for the PLMN

or the SNPN

Stored information

Cell Selection

no suitable cell found


Cell selection upon leaving connected

mode

suitable cell found 2

suitable

cell found Camped

normally

suitable cell found


leave idle/inactive

mode

return to idle/inactive

mode

Connected mode

Cell Reselection Evaluation

Process

suitable

cell found

trigger

no suitable

cell found

1 Cell Selection

when leaving connected

mode

no acceptable cell found

acceptable cell

found

acceptable cell found; move to

idle mode

suitable

cell found 2

leave idle mode

return to

idle mode

Connected mode

(Emergency calls only)

Cell

Reselection Evaluation Process

acceptable

cell found

trigger


NAS indicates that registration on selected

PLMN or selected SNPN is rejected

(except with cause #12, #14 , #15 or #25

[9][14])

suitable cell found

RRC_IDLE and RRC_INACTIVE Cell Selection and Reselection

Cell selection


Cell selection

12

a) Initial cell selection (no prior knowledge of which RF channels are NR frequencies):

• 1. The UE shall scan all RF channels in the NR bands according to its capabilities to find a suitable cell.

• 2. On each frequency, the UE need only search for the strongest cell.• 3. Once a suitable cell is found, this cell shall be selected.

b) Cell selection by leveraging stored information:• 1. This procedure requires stored information of frequencies and

optionally also information on cell parameters from previously received measurement control information elements or from previously detected cells.

• 2. Once the UE has found a suitable cell, the UE shall select it.• 3. If no suitable cell is found, the initial cell selection procedure in a)

shall be started.

NOTE:Priorities between different frequencies or RATs provided to the UE

by system information or dedicated signalling are not used in the

cell selection process.


Cell selectionThe cell selection criterion S is fulfilled when:

Srxlev > 0 AND Squal > 0

where:

13

Srxlev = Qrxlevmeas – (Qrxlevmin + Qrxlevminoffset )– Pcompensation - QoffsettempSqual = Qqualmeas – (Qqualmin + Qqualminoffset) - Qoffsettemp

In RAN2 101bis meeting, it was agreed that:“The UE does not need to read system information from neighbor cells for determining cell quality and ranking. FFS how to capture in spec.”

Measured cell RX level value

Minimum required RX level in the cell ConnEstFail related

ConnEstFail related


Cell reselectionThe high level criterions of current cell reselection scheme is:

absolute frequency priority(FP),

radio link quality, or

cell accessibility.

14

Configure frequency priority

Perform Measurement

Find the highest ranked cell or the best cell

reselected to the cell

frequency priority could be configured by:1. Dedicated message (e.g. RRCRelease)2. Broadcast message (e.g. SIB2, SIB4 and SIB5)3. Inherit from another RAT

Limit needed measurements rules:1. Always measure higher FP frequency2. Conditionally measure equal or lower FP freq.

• E.g. Serving cell’s signal quality bellows a threshold

S criterion:• Measured cell should satisfy the S criterionR criterion:• Ranking of all cells that fulfil the cell selection criterion S

If 1. The cell is better ranked than the serving cell during a time

interval, and2. more than 1 second has elapsed since the UE camped on

the current serving cell

check if the access is restricted/barred

• Read MIB (in NR) (in LTE, read SystemInformationBlockType1)• If cell status is "not barred" and "not reserved“, treat this cell

as candidate


Cell reselection

15


Perform Measurement



frequency priority could be configured by:1. Dedicated message (e.g. RRCRelease)2. Broadcast message (e.g. SIB2, SIB4 and SIB5)3. Inherit from another RAT


1. Dedicated message (e.g. RRCRelease) 2. Broadcast message (e.g. SIB2, SIB4 and SIB5)

3. Inherit from another RAT

The UE shall inherit the priorities provided by dedicated

signalling and the remaining validity time (i.e. T320 in NR and

E-UTRA), if configured, at inter-RAT cell (re)selection.

cellReselectionPriorities

freqPriorityListEUTRA

freqPriorityListNR

T320

FreqPriorityEUTRA

FreqPriorityEUTRA

FreqPriorityNR

FreqPriorityNR

carrierFreq

cellReselectionPriority

cellReselectionSubPriority

carrierFreq

cellReselectionPriority

cellReselectionSubPriority

maxFreq=8

maxFreq=8

SIB2 SIB2 contains cell re-selection information common for intra-frequency, inter-frequency and/or inter-RAT cell re-selection

SIB4 SIB4 contains information relevant only for inter-frequency cell re-selection

SIB5 SIB5 contains information relevant only for inter-RAT cell re-selection


Cell reselection

16


Perform Measurement






If the serving cell fulfils Srxlev > SIntraSearchP and Squal > SIntraSearchQ, the UE may choose not to perform intra-frequency measurements.Otherwise, the UE shall perform intra-frequency measurements.

intra-frequency measurements


Cell reselection

17


Perform Measurement






The UE shall apply the following rules for NR inter-frequencies and inter-RAT frequencies which are indicated in system information and for which the UE has priority.

inter-frequency measurements

For a NR inter-frequency or inter-RAT frequency with a reselection priority higher than the reselection priority of the current NR frequency, the UE shall perform measurements of higher priority NR inter-frequency or inter-RAT frequencies

For a NR inter-frequency with an equal or lower reselection priority than the reselection priority of the current NR frequency and for inter-RAT frequency with lower reselection priority than the reselection priority of the current NR frequency:- If the serving cell fulfils Srxlev > SnonIntraSearchP and Squal > SnonIntraSearchQ, the UE may choose not to perform measurements of NR inter-frequencies or inter-RAT frequency cells of equal or lower priority;- Otherwise, the UE shall perform measurements of NR inter-frequencies or inter-RAT frequency cells of equal or lower priority


Cell reselection

18


Perform Measurement



S criterion:• Measured cell should satisfy the S criterionR criterion:• Ranking of cells that fulfil the cell selection

criterion S


The cell-ranking criterion Rs for serving cell and Rn for neighbouring cells is defined by:Rs = Qmeas,s +Qhyst - QoffsettempRn = Qmeas,n -Qoffset - Qoffsettemp

Qmeas RSRP measurement quantity used in cell reselections.

Qoffset For intra-frequency: Equals to Qoffsets,n, if Qoffsets,n is

valid, otherwise this equals to zero.

For inter-frequency: Equals to Qoffsets,n plus

Qoffsetfrequency, if Qoffsets,n is valid, otherwise this equals to

Qoffsetfrequency.

Qoffsettemp Offset temporarily applied to a cell as specified in TS

38.331 [3].

At RAN2 #101bis meeting: Number of actual good beams needs to be considered in cell quality derivation or cell

reselection rule for cell reselection. One solution should be brought to next meeting.

R2-1808330 Email discussion report of [101bis#66][NR] Good beams in cell reselection• Option2.2: Liner average of up to N best beams + Delta*(K-N)

supported by 12 companies (MTK, CMCC, OPPO, CATT, ASUSTeK, vivo, Apple, Huawei&HiSilicon, Sony, ZTE, Intel, DCM)

• Option2.3: For the cells with similar average value, UE reselects to the cell with more good beams

acceptable to 15 companies (Nokia, Samsung, Ericsson, Qualcomm, Interdigital, LG, DCM, CMCC, OPPO, CATT, vivo, Sony, ZTE, Huawei&HiSilicon, Apple)

Number of actual good beams issue


Cell reselection

19


Perform Measurement



S criterion:• Measured cell should satisfy the S criterionR criterion:• Ranking of cells that fulfil the cell selection criterion S


Number of actual good beams issue in TS 38.304

If rangeToBestCell is not configured, the UE shall perform cell reselection to the highest ranked cell. If this cell is found to be not-suitable, the UE shall behave according to subclause 5.2.4.4.

If rangeToBestCell is configured, then the UE shall perform cell reselection to the cell with the highest number of beams above the threshold (i.e. absThreshSS-BlocksConsolidation) among the cells whose R value is within rangeToBestCell of the R value of the highest ranked cell.

If there are multiple such cells, the UE shall perform cell reselection to the highest ranked cell among them. If this cell is found to be not-suitable, the UE shall behave according to subclause5.2.4.4.


Cell reselection

20


Perform Measurement




Cell status and cell reservations

Cell status and cell reservations are indicated in the MIB or SIB1 message as specified in TS 38.331 [3] by means of three fields:

- cellBarred (IE type: "barred" or "not barred") Indicated in MIB message. In case of multiple PLMNs indicated in SIB1, this field is common for all PLMNs

- cellReservedForOperatorUse (IE type: "reserved" or "not reserved") Indicated in SIB1 message. In case of multiple PLMNs indicated in SIB1, this field is specified per PLMN.

- cellReservedForOtherUse (IE type: "true") Indicated in SIB1 message. In case of multiple PLMNs indicated in SIB1, this field is common for all PLMNs.

If 1. The cell is better ranked than the serving cell during a time interval,

and2. more than 1 second has elapsed since the UE camped on the current

serving cell


Cell reselection

21


Perform Measurement




When cell status "barred" is indicated or to be treated as if the cell status is "barred“- The UE is not permitted to select/reselect this cell, not even for emergency calls.- The UE shall select another cell according to the following rule:

Reason for barred UE’s behavior Note

cell status is "barred" due to being unable to acquire the MIB

- exclude the barred cell as a candidate for cell selection/reselection for up to 300 seconds- select another cell on the same frequency if the selection criteria are fulfilled

The cell may be for EN-DC

the cell status is "barred" due to being unable to acquire the SIB1 ordue to trackingAreaCode being absent in SIB1

If the field intraFreqReselection in MIB message is set to "allowed"

- exclude the barred cell as a candidate for cell selection/reselection for up to 300 seconds

If the field intraFreqReselection in MIB message is set to "not allowed"

- exclude the barred cell as a candidate for cell selection/reselection for up to 300 seconds- UE shall not re-select a cell on the same frequency as the barred cell



Any Cell Selection

go here when no




subscription added

Camped on any cell


SNPN is selected




or the SNPN

Stored information

Cell Selection




mode


suitable

cell found Camped

normally

suitable cell found


leave idle/inactive

mode


mode

Connected mode


Process

suitable

cell found

trigger

no suitable

cell found

1 Cell Selection


mode


acceptable cell

found


idle mode

suitable

cell found 2

leave idle mode

return to

idle mode

Connected mode


Cell


acceptable

cell found

trigger





[9][14])

suitable cell found

22

When camped normally, the UE shall perform the following tasks:

- monitor the paging channel of the cell as specified in clause 7 according to information

broadcast in SIB1;

- monitor Short Messages transmitted with P-RNTI over DCI as specified in clause

6.5 in TS 38.331 [3];

- monitor relevant System Information as specified in TS 38.331 [3];

- perform necessary measurements for the cell reselection evaluation procedure;

- execute the cell reselection evaluation process on the following occasions/triggers:

1) UE internal triggers, so as to meet performance as specified in TS 38.133 [8];

2) When information on the BCCH used for the cell reselection evaluation procedure

has been modified.

Short Messages can be transmitted on PDCCH using P-RNTI with or without

associated Paging message using Short Message field in DCI format 1_0 (see TS

38.212 [17], clause 7.3.1.2.1).

Bit Short Message

1 systemInfoModification

If set to 1: indication of a BCCH modification other than SIB6, SIB7 and SIB8.

2 etwsAndCmasIndication

If set to 1: indication of an ETWS primary notification and/or an ETWS

secondary notification and/or a CMAS notification.

3 – 8 Not used in this release of the specification, and shall be ignored by UE if

received.

Camped normally

DCI: Downlink Control Information



Any Cell Selection

go here when no




subscription added

Camped on any cell


SNPN is selected




or the SNPN

Stored information

Cell Selection




mode


suitable

cell found Camped

normally

suitable cell found


leave idle/inactive

mode


mode

Connected mode


Process

suitable

cell found

trigger

no suitable

cell found

1 Cell Selection


mode


acceptable cell

found


idle mode

suitable

cell found 2

leave idle mode

return to

idle mode

Connected mode


Cell


acceptable

cell found

trigger





[9][14])

suitable cell found

23

This state is applicable for RRC_IDLE and RRC_INACTIVE state.

In this state, the UE shall perform cell selection process to find a suitable cell.

If the cell selection process fails to find a suitable cell after a complete scan of

all RATs and all frequency bands supported by the UE, the UE shall attempt to

find an acceptable cell of any PLMN to camp on, trying all RATs that are

supported by the UE and searching first for a high-quality cell, as defined in

subclause 5.1.1.2.

Acceptable cell:

An "acceptable cell" is a cell on which the UE may camp to obtain limited

service (originate emergency calls and receive ETWS and CMAS

notifications).

Any Cell Selection



Any Cell Selection

go here when no




subscription added

Camped on any cell


SNPN is selected




or the SNPN

Stored information

Cell Selection




mode


suitable

cell found Camped

normally

suitable cell found


leave idle/inactive

mode


mode

Connected mode


Process

suitable

cell found

trigger

no suitable

cell found

1 Cell Selection


mode


acceptable cell

found


idle mode

suitable

cell found 2

leave idle mode

return to

idle mode

Connected mode


Cell


acceptable

cell found

trigger





[9][14])

suitable cell found

24

This state is only applicable for RRC_IDLE state. In this state, the UE shall

perform the following tasks:

- monitor the paging channel of the cell as specified in clause 7 according to

information broadcast in SIB1;

- monitor Short Messages transmitted with P-RNTI over DCI as specified in

clause 6.5 in TS 38.331 [3];

- monitor relevant System Information as specified in TS 38.331 [3];

- perform necessary measurements for the cell reselection evaluation procedure;

- execute the cell reselection evaluation process on the following

occasions/triggers:

1)UE internal triggers, so as to meet performance as specified in TS 38.133

[8];

2)When information on the BCCH used for the cell reselection evaluation

procedure has been modified.

- regularly attempt to find a suitable cell trying all frequencies of all RATs

that are supported by the UE. If a suitable cell is found, UE shall move to

camped normally state.

Acceptable cell:

An "acceptable cell" is a cell on which the UE may camp to obtain

limited service (originate emergency calls and receive ETWS and CMAS

notifications).

Camped on any cell


PAGING

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Paging – PrinciplesRAN2 NR Ad Hoc-1

R2-1700016 Paging in NR

Paging in LTE

26

Agreements for NR paging:1: UE in RRC_IDLE and RRC_INACTVE state monitors paging/notification every DRX cycle. 2: UE monitors one paging occasion per DRX cycle. Paging occasion is the time interval over which a paging message is transmitted by gNB. 3: The length of DRX cycle is configurable. A default DRX cycle length is provided in system information. Additionally, a UE specific DRX cycle length can also be provided to UE in dedicated signalling.4: The number of paging occasions in the DRX cycle is configurable and provided in system information.5: If multiple paging occasions are configured by network in the DRX cycle then UEs can be distributed to these paging occasions based on UE ID.

T: DRX Cycle

PF: Paging Frames in DRX cycle PO: Paging Occasions in each PF

PF of UE with UE ID 1024 PO of UE with UE ID 1024

Ref: R2-1700016


Paging - Beam sweeping RAN2 NR Ad Hoc-1

R2-1700016 Paging in NR

RAN1 has also discussed the paging transmission using multiple DL TX beams and has made the following agreements

27

Agreements for NR paging:6: RAN2 understanding is that paging can be transmitted at least using beam sweeping (content of paging may be a paging indicator or the paging message, FFS)7: Paging occasion can consists of multiple time slots (e.g. subframe or OFDM symbol). (Multiple time slots enables transmission of paging using a different set of DL TX beam(s) in each time slot, or could enable repetition - RAN1 decision).8: The number of time slots in a paging occasion is provided in system information.

RAN 1 Agreement:•For paging in multi-beam operation, support beam sweeping for paging, and study the following methods:

–Alt-1: Multiplexing paging with SS blocks•FFS: Details of paging

–Alt-2: Adding another round of beam sweeping for paging •Note: Another round of beam sweeping is different from the beam sweeping of SS burst set

–Other alternatives are not precluded

T: DRX Cycle

PF: Paging Frame (One Radio Frame)

PO: Paging Occasion (Multiple subframes)

E.g. 6 TX beams at gNB

TX1B1

TX2B2

TX3B3

TX4B4

TX5B5

TX6B6

sf0sf0 sf1sf1 sf2sf2 sf3sf3 sf4sf4 sf5sf5 sf6sf6 sf7sf7 sf8sf8 sf9sf9

PO

Ref: R2-1700016


Paging - Beam sweeping RAN2 NR Ad Hoc 1801 (Jan 2018)

R2-1800152 Issues about NR paging occasion CATT

R2-1800078 Paging in NR – Beamforming Aspects Samsung

Paging transmission using TX beam sweeping and TX beam repetition in PO

28

Agreements1 From RAN2 understanding for paging in multi-beam operation TX beam sweeping can be performed in paging occasion. Paging transmission from each TX beam is not repeated for RX beam sweeping at UE.

T: DRX Cycle

POPO

TX1B1

TX2B2

TX3B3

TX4B4

TX5B5

TX6B6

s0s0 s1s1 s2s2 s3s3 s4s4 s5s5

TX beam(s) is repeated to enable RX beam sweeping.

TX beam(s) is repeated to enable RX beam sweeping.

s6s6 s7s7 s8s8 s9s9 s10s10 s11s11

TX1B1

TX2B2

TX3B3

TX4B4

TX5B5

TX6B6

UE RX B1

UE RX B2

Paging Time slotPaging Time slot

Ref: R2-1800078


Paging - Beam sweepingRAN2#101 (Feb 2018)

R2-1803644 Definition of Paging OccasionHuawei

Proposal 2: The UE can assume that the same paging message is repeated in all beams of the sweeping pattern, and the UE may monitor any beam that is good enough for successful reception.

29

Agreements1: The length of one PO in case of beam sweeping is one period of beam sweeping 2: The UE can assume that the same paging message is repeated in all beams of the sweeping pattern.

Ref: R2-1800078


Paging - DRXRAN2 NR Ad Hoc 1801 (Jan 2018)

R2-1801179 Discussion on maximum idle mode DRX value in NR Huawei

The main motivation to extend idle mode DRX cycle beyond 2.56s is for MTC and NB-IoT devices.

Since mMTC is not in the scope of Rel-15 NR, we think RAN2 don’t need to extend the idle mode DRX cycle in Rel-15.

30

Agreements1 Idle mode/inactive mode DRX cycle configuration in NR should take the default DRX cycle parameter in LTE as baseline.2 The maximum idle/inactive mode DRX value in NR should be 2.56s.

RAN2 #105 (Feb 2019)

=> RAN2 will consider extending the DRX cycle length to

10.24 in idle and inactive mode.


Paging - Paging ReceptionR2-1812276 Correction to the UE identity for PO calculation Ericsson

The paging occasion is determined based on the UE identity which in turn is derived from IMSI.

UE_ID = IMSI mod 1024

The number 1024 in the above formula is due to the maximum DRX cycle which is 1024 radio frames long

IMSI privacy is one of the main security requirements in 5GS and SA3 has made additional efforts to ensure that IMSI is not exposed on the air interface.

Proposal 1: 5G-S-TMSI is used as UE identity for calculating the paging occasion

Note:

This contribution is a re-submission of R2-1809621 which was discussed at RAN2#1807.

The discussion resulted in the LS [6] being sent to SA3 and asks SA3 to answer if they see any privacy concerns with using IMSI as UE identity.

31


Paging - Paging Reception

R2-1813267 Reply LS on UE identity for PO calculation (S3-182539; contact: Ericsson) SA3

SA3 would like to point out that IMSI privacy is one of the main privacy features in 5G and SA3 has made additional efforts to make it possible that IMSI can be concealed over-the-air (see TS 33.501).

Further to support IMSI privacy, SA2 has decided that IMSI based paging is not supported in 5G

Therefore, SA3 requests RAN2 to calculate paging occasion in NR without using IMSI, and to use other temporary identifiers like 5G-S-TMSI.

R2-1812276 Correction to the UE identity for PO calculation Ericsson CR Rel-15 38.30415.0.0 0005 2 F NR_newRAT-Core R2-1812276

=> Agreed to be merged into the rapporteur's CR

32



LTE Paging Reception NR Paging Reception

33

Find out paging frame (PF)

Find out paging occasions (PO)

Monitor Paging message (PM)

SFN for the PF is determined by: (SFN mod T) = (T div N)*(UE_ID mod N)

SFN for the PF is determined by: (SFN + PF_offset) mod T = (T div N)*(UE_ID mod N)

by mapping table:

Find out paging frame (PF)

Find out paging occasions (PO)

Find out time slot

Monitor Paging message (PM)

PDCCH monitoring occasions



The PDCCH monitoring occasions for paging are determined according to pagingSearchSpace as specified in TS 38.213 [4] and firstPDCCH-MonitoringOccasionOfPO and nrofPDCCH-MonitoringOccasionPerSSB-InPOif configured as specified in TS 38.331 [3].

When SearchSpaceId = 0 is configured for pagingSearchSpace, the PDCCH monitoring occasions for paging are same as for RMSI as defined in clause 13 in TS 38.213 [4].

When SearchSpaceId = 0 is configured for pagingSearchSpace, Ns is either 1 or 2.

For Ns = 1, there is only one PO which starts from the first PDCCH monitoring occasion for paging in the PF.

For Ns = 2, PO is either in the first half frame (i_s = 0) or the second half frame (i_s = 1) of the PF.

SearchSpaceId = 0, 一個radio frame至多一個 PO，

34

Ns: number of paging occasions for a PF


Paging – Paging Reception

A PO is a set of 'S*X ' consecutive PDCCH monitoring occasions where 'S' is the number of actual transmitted SSBs determined according to ssb-PositionsInBurst in SIB1 and X is the nrofPDCCH-MonitoringOccasionPerSSB-InPO if configured or is equal to 1 otherwise.

35

A PO is a set of 'S' consecutive PDCCH monitoring occasions

For example, S = 2 actual transmitted SSBs

The PO is a set of 2 consecutive PDCCH monitoring occasions

PF

第1個 PMO

(PDCCH

monitoring

occasions)

第2個 PMO

PO



The [x*S+K]th PDCCH monitoring occasion for paging in the PO corresponds to the Kth transmitted SSB, where x=0,1,…,X-1, K=1,2,…,S.

X is the nrofPDCCH-MonitoringOccasionPerSSB-InPO if configured or is equal to 1 otherwisex=0

'S' is the number of actual transmitted SSBs determined according to ssb-PositionsInBurst in SIB1For example, S = 4 -> 有4個SSBs

K = 1, 2, 3, 4

第1個 PDCCH monitoring occasion 對應第1個transmitted SSB




The PDCCH monitoring occasions for paging which do not overlap with UL symbols (determined according to tdd-UL-DL-ConfigurationCommon) are sequentially numbered from zero starting from the first PDCCH monitoring occasion for paging in the PF.第1個 PDCCH monitoring occasion (i.e. PDCCH monitoring occasion NO. 0)對應第1個transmitted SSB

第2個 PDCCH monitoring occasion (i.e. PDCCH monitoring occasion NO. 1)對應第2個transmitted SSB



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When firstPDCCH-MonitoringOccasionOfPO is present, the starting PDCCH monitoring occasion number of (i_s + 1)th PO is the (i_s + 1)th value of the firstPDCCH-MonitoringOccasionOfPO parameter; otherwise, it is equal to i_s * S*X.

X is the nrofPDCCH-MonitoringOccasionPerSSB-InPO if configured or is equal to 1 otherwise

x=0

'S' is the number of actual transmitted SSBs determined according to ssb-PositionsInBurst in SIB1

For example, S = 4 -> 有4個SSBs

K = 1, 2, 3, 4

firstPDCCH-MonitoringOccasionOfPO is not present

Starting PDCCH monitoring occasion number = i_s * S*X

For example,

i_s = 0 的UE => Starting PDCCH monitoring occasion number = 0

i_s = 1 的UE => Starting PDCCH monitoring occasion number = 4

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Paging – Paging Receptionpaging-SearchSpace configuration (Periodicity: 5 slots; Offset: 0; duration: 2 slots; monitoringSymbolsWithinSlot: 00100000100000;CORESET-time-duration: 4 OFDM symbols)

38

R2-1809477

SFN = F1

PDCCH

Monitoring

Occasion 0

PDCCH

Monitoring

Occasion 1

Slots corresponding to 1st PO

Slots corresponding to 2nd PO

PDCCH

Monitoring

Occasion 2

PDCCH

Monitoring

Occasion 3

PDCCH

Monitoring

Occasion 4

PDCCH

Monitoring

Occasion 5

PDCCH

Monitoring

Occasion 6

PDCCH

Monitoring

Occasion 7

SSB 1

SSB 1

SSB 2

SSB 2

SSB 3 SSB 4

SSB 3 SSB 4

nB = 2T; Reference Frame determined by UE: SFN ‘F1’; Number of SSBs = 4

i_s = 0 PO = 1st PO = PDCCH monitoring occasion 0,1,2,3

i_s = 1 PO = 2nd PO = PDCCH monitoring occasion 4,5,6,7 (?? Why not 0, 1, 2, 3)




39


S = 2 actual transmitted SSBs

The Kth PDCCH monitoring occasion for paging in the PO

corresponds to the Kth transmitted SSB

PF

第1個 PMO

(PDCCH

monitoring

occasions)

第2個 PMO

SSB 1 SSB 2

PO




The [x*S+K]th PDCCH monitoring occasion for paging in the PO corresponds to the Kth transmitted SSB, where x=0,1,…,X-1, K=1,2,…,S.

X is the nrofPDCCH-MonitoringOccasionPerSSB-InPO if configured or is equal to 1 otherwise

x=0, 1 ->第1個transmitted SSB對應第一個([0*2+1]th )與第三個([1*2+1]th )PDCCH monitoring occasion

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nrofPDCCH-MonitoringOccasionPerSSB-InPO = 2

PF

第1個 PMO 第2個 PMO

SSB 1 SSB 2

PO


SSB 1 SSB 2

If X > 1, when the UE detects a PDCCH transmission

addressed to P-RNTI within its PO, the UE is not required to

monitor the subsequent PDCCH monitoring occasions for

this PO.



When firstPDCCH-MonitoringOccasionOfPO is present, the starting PDCCH monitoring occasion number of (i_s + 1)th PO is the (i_s + 1)th value of the firstPDCCH-MonitoringOccasionOfPO parameter; otherwise, it is equal to i_s * S*X.



firstPDCCH-MonitoringOccasionOfPO is present

Starting PDCCH monitoring occasion number = (i_s + 1)th PO is the (i_s + 1)th value of the firstPDCCH-MonitoringOccasionOfPO

41

10 slots = 140 symbols





For a UE with i_S = 0, its PO is starting from PDCCH monitoring occasion number = 0

42





PF


1st PO




firstPDCCH-MonitoringOccasionOfPO is present

Starting PDCCH monitoring occasion number = (i_s + 1)th PO is the (i_s + 1)th value of the firstPDCCH-MonitoringOccasionOfPO

For a UE with i_S = 0, its PO is starting from PDCCH monitoring occasion number = 1st value of the firstPDCCH-MonitoringOccasionOfPO

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1st value of the firstPDCCH-MonitoringOccasionOfPO

= 1

PF


1st PO


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Date post:	03-Nov-2021
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