LTE Parameter - Channel Config RA

U e State Sta St ate Ha H Handling andli lin ng Ue

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States in UTRAN, GERAN, E-UTRA • The following transitions are supported by the LTE: 3G

LTE

G SM GSM_Connected

CELL_DCH

CELL_FACH

Handover

E-UTRA RRC_CONNECTED

Handover GPRS Packet transfer mode











Mobility Management States Definition of main EPS Mobility Management states • EMM-DEREGISTERED – The UE is not reachable by a MME. – UE context can still be stored in the UE and MME

• EMM-REGISTERED procedur e – UE enters to EMM-Registered with Attach or Tracking Area Update procedure – The UE location is known with accuracy of the tracking area list – UE has at least one active PDN connection











Connection Management States Definition of EPS Connection Management states • ECM-IDLE si gnaling connection between UE and network exists. – UE is in ECM-IDLE state when no NAS signaling sh all perform: – In the EMM-REGISTERED and ECM-IDLE state, the UE shall    

Tracking Area Update Periodic Tracking Area Update Service Request Answer to paging from MME with Service Request

– UE and MME enter the ECM-CONNECTED state when signaling connection is established.

• ECM-CONNECTED UE location is known in the MME with an accuracy of a serving eNodeB.























DRX/DTX – Gener DRX/DTX General al Motivation Motivation is the the Challeng Challenge e –> Battery Battery Capacity Increases only Slowly Compared to Moore’s Moore’s Law











Normal Norm al eNB eNB Initia Initiated ted Transiti ransition on to ECM-ID ECM-IDLE LE (e.g. due to user inactivity)

inactivityTimer











Inactivity Timer Parameter











DTX/DRX Discontinuous Transmission/ Reception





























































































DRX in RRC Connected Mode (RL30) DRX Timers (2/3) • •

DRX Inactivity timer:

Specifies the number of consecutive TTIs during which the UE shall monitor PDCCH after successfully decoding decoding a PDCCH indicating an initial UL or DL user data transmission transmission for this UE • Will be started or restarted if the PDCCH indicated a new UL or DL transmission and if the UE is DRX Active at that time • If running UE is DRX active • For bursty traffic the scheduler can keep the UE awake by scheduling it in a specific time window (with continuously grants to UE, DRX Inactivity Timer Window will be moved beyond











DRX in RRC Connected Mode (RL30) DRX Timers (3/3) •

DRX Retransmission Timer:

•

Specifies the maximum number of consecutive PDCCH sub-frames for possible allocations allocations as soon as a DL retransmission is expected by the UE Started after HARQ Timer* expires and DL data were not decoded successfully Purpose: Span a window within the UE listens on PDCCH for a retransmission in DL If running, UE is DRX active Stopped when PDCCH indicates a DL transmission and UE is DRX active at that time As UE is DRX Active when DRX Retransmission timer is running, eNB could schedule UE in DL or UL for new transmissions

• • • • •











DRX in RRC Connected Mode (RL30) Example of UL Transmission DRX Inactivity Timer

Transmission in UL is possible while UE is DRX Sleep

DRX On Duration

(1) UL grant on PDCCH

(2) UL transmission on PUSCH

(3) NACK on PHICH + UL grant for adaptive retransmission on PDCCH

(4) UL retransmission on PUSCH

In case that the transmission in (4) also failed, this subframe would be the next slot for giving an UL grant for a retransmission. Hence, this sub-frame belongs to the DRX Active time too.











DRX in RRC Connected Mode (RL30) DRX Profile Modeling • • •

The DRX profiles can be map mapped ped flex flexibly ibly to differ different ent QCI profiles qciTab is enhanced by an index to DRX profiles For each DRX profile index a DRX profile is provided DRX Profiles

QCI Table QCI 1

drxProfileIndex {1,2}, default 2

2 3 4

{1,2,3}, default 2 {1,2,3}, default 2 {1 2 3} default 2

drxProfileIndex 1 2 3

drxProfilePriority 45 40 30

Further DRX parameters None (DRX is off)











Extended DRX Settings (RL30) Overview • •

Extended setting for DRX in connected mode 2 additional DRX profiles with longer setting for the t he DRX cycle: – drxProfile4 applyOutOfSyncState Non-GBR: intermediate DRX Useful for e.g. QCI 5 IMS related traffic – drxProfile5 Non-GBR: Long DRX Useful for UE with bursty traffic, e.g. web browsing  

 

Define which UEs should be sent in out of sync state LNCEL: LNCEL: extendedDrxOnly(0), extendedDrxOnly(0), allDrx(1), allUEs(2); extendedDrxOnly(0) (i.e. Only UEs configured with extended settings for the long DRX cycle )













Extended DRX Settings (RL30)











DRX in Connected Mode: Parameters overview











DRX Related Parameter











DRX setting on RRCC RRCConne onnectionRe ctionReconfigu configuration ration messag message e (Sample on QXDM log file)













































LTE Parameter - Channel Config RA

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