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5G/NR - Paging |
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Paging is a critical functionality in cellular systems, used to notify a UE (User Equipment) of incoming services or messages while minimizing power consumption by not requiring continuous monitoring of the network The overal purpose of Paging in NR is same as LTE Paging, but in details there are some differences between NR paging and LTE paging.
In LTE, Paging had performed roughly 3 main things as follows.
In NR, Paging functions mostly for Triggering RRC Setup (RRC Request and RRC Connection Resumption). System Information Modification and PWS/ETWS notification is done by DCI 1_0 with P_RNTI and corresponding PDSCH. Paing MessageThe Paging message in NR follows ASN.1 encoding, similar to LTE. Paging ::= SEQUENCE { pagingRecordList PagingRecordList OPTIONAL, -- Need N lateNonCriticalExtension OCTET STRING OPTIONAL, nonCriticalExtension SEQUENCE{} OPTIONAL }
PagingRecordList ::= SEQUENCE (SIZE(1..maxNrofPageRec)) OF PagingRecord
PagingRecord ::= SEQUENCE { ue-Identity PagingUE-Identity, accessType ENUMERATED {non3GPP} OPTIONAL, -- Need N ... }
PagingUE-Identity ::= CHOICE { ng-5G-S-TMSI NG-5G-S-TMSI, fullI-RNTI I-RNTI-Value, ... } Key components include:
Paging ConfigurationPaging configuration in 5G is defined within SIB1, providing details about how UEs monitor paging messages to maintain energy efficiency while ensuring responsiveness to network events. The paging process is designed around the Paging Control Channel (PCCH), which serves as the communication medium for delivering paging messages. In this context, the paging cycle is a fundamental parameter that specifies how often a UE should wake up to check for paging messages. The cycle is defined in terms of radio frame intervals, allowing for flexible configurations such as 32, 64, 128, or 256 frames. Longer intervals reduce energy consumption by minimizing the frequency of paging monitoring, though this comes at the cost of increased latency in responding to network requests. The configuration also includes the notion of paging frame offsets, which determine the precise timing within a cycle when paging occurs. These offsets can be subdivided into smaller intervals such as half, quarter, or sixteenth of a frame, enabling fine-grained control over paging occasions. Additionally, the network specifies the number of subframes (1, 2, or 4) within each paging frame that may carry paging messages, further refining the scheduling process. SIB1 ::= SEQUENCE { cellSelectionInfo SEQUENCE { q-RxLevMin Q-RxLevMin, q-RxLevMinOffset INTEGER (1..8) OPTIONAL, -- Need R q-RxLevMinSUL Q-RxLevMin OPTIONAL, -- Need R q-QualMin Q-QualMin OPTIONAL, -- Need R q-QualMinOffset INTEGER (1..8) OPTIONAL -- Need R } OPTIONAL, -- Need S cellAccessRelatedInfo CellAccessRelatedInfo, connEstFailureControl ConnEstFailureControl OPTIONAL, -- Need R si-SchedulingInfo SI-SchedulingInfo OPTIONAL, -- Need R servingCellConfigCommon ServingCellConfigCommonSIB OPTIONAL, -- Need R ims-EmergencySupport ENUMERATED {true} OPTIONAL, -- Need R eCallOverIMS-Support ENUMERATED {true} OPTIONAL, -- Cond Absent ue-TimersAndConstants UE-TimersAndConstants OPTIONAL, -- Need R
uac-BarringInfo SEQUENCE { uac-BarringForCommon UAC-BarringPerCatList OPTIONAL, -- Need S uac-BarringPerPLMN-List UAC-BarringPerPLMN-List OPTIONAL, -- Need S uac-BarringInfoSetList UAC-BarringInfoSetList, uac-AccessCategory1-SelectionAssistanceInfo CHOICE { plmnCommon UAC-AccessCategory1-SelectionAssistanceInfo, individualPLMNList SEQUENCE (SIZE (2..maxPLMN)) OF UAC-AccessCategory1-SelectionAssistanceInfo } OPTIONAL } OPTIONAL, -- Need R
useFullResumeID ENUMERATED {true} OPTIONAL, -- Need N lateNonCriticalExtension OCTET STRING OPTIONAL, nonCriticalExtension SEQUENCE{} OPTIONAL }
UAC-AccessCategory1-SelectionAssistanceInfo ::= ENUMERATED {a, b, c}
ServingCellConfigCommonSIB ::= SEQUENCE { downlinkConfigCommon DownlinkConfigCommonSIB, uplinkConfigCommon UplinkConfigCommonSIB OPTIONAL, -- Need R supplementaryUplink UplinkConfigCommonSIB OPTIONAL, -- Need R n-TimingAdvanceOffset ENUMERATED { n0, n25560, n39936 } OPTIONAL, -- Need S ssb-PositionsInBurst SEQUENCE { inOneGroup BIT STRING (SIZE (8)), groupPresence BIT STRING (SIZE (8)) OPTIONAL -- Cond Above6GHzOnly }, ssb-PeriodicityServingCell ENUMERATED {ms5, ms10, ms20, ms40, ms80, ms160}, tdd-UL-DL-ConfigurationCommon TDD-UL-DL-ConfigCommon OPTIONAL, -- Cond TDD ss-PBCH-BlockPower INTEGER (-60..50), ... }
DownlinkConfigCommonSIB ::= SEQUENCE { frequencyInfoDL FrequencyInfoDL-SIB, initialDownlinkBWP BWP-DownlinkCommon, bcch-Config BCCH-Config, pcch-Config PCCH-Config, ... }
PCCH-Config ::= SEQUENCE { defaultPagingCycle PagingCycle, nAndPagingFrameOffset CHOICE { oneT NULL, halfT INTEGER (0..1), quarterT INTEGER (0..3), oneEighthT INTEGER (0..7), oneSixteenthT INTEGER (0..15) }, ns ENUMERATED {four, two, one}, firstPDCCH-MonitoringOccasionOfPO CHOICE { sCS15KHZoneT SEQUENCE (SIZE (1..maxPO-perPF)) OF INTEGER (0..139), sCS30KHZoneT-SCS15KHZhalfT SEQUENCE (SIZE (1..maxPO-perPF)) OF INTEGER (0..279), sCS60KHZoneT-SCS30KHZhalfT-SCS15KHZquarterT SEQUENCE (SIZE (1..maxPO-perPF)) OF INTEGER (0..559), sCS120KHZoneT-SCS60KHZhalfT-SCS30KHZquarterT-SCS15KHZoneEighthT SEQUENCE (SIZE (1..maxPO-perPF)) OF INTEGER (0..1119), sCS120KHZhalfT-SCS60KHZquarterT-SCS30KHZoneEighthT-SCS15KHZoneSixteenthT SEQUENCE (SIZE (1..maxPO-perPF)) OF INTEGER (0..2239), sCS120KHZquarterT-SCS60KHZoneEighthT-SCS30KHZoneSixteenthT SEQUENCE (SIZE (1..maxPO-perPF)) OF INTEGER (0..4479), sCS120KHZoneEighthT-SCS60KHZoneSixteenthT SEQUENCE (SIZE (1..maxPO-perPF)) OF INTEGER (0..8959), sCS120KHZoneSixteenthT SEQUENCE (SIZE (1..maxPO-perPF)) OF INTEGER (0..17919) } OPTIONAL, -- Need R ... }
PagingCycle ::= ENUMERATED {rf32, rf64, rf128, rf256}
Reference
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