MDT Minimization of Drive Test 2011 07 15

MDT (Minimization of Drive Test) 2011. 07. 15 Sung. Hoon Jung: sunghoon. jung@lge. com Copyright Notification . No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. ⓒ 2011. LG 3 GPP RAN 2 team. All rights reserved. LG Electronics RAN 2 Team

List Motivation for MDT Two types of MDT Initiation Logged MDT § Logging mechanism § Configuration validity - Duration Timer Logging § Logging across Area / RATs / PLMNs Reporting MDT memory handling Immediate MDT Basic mechanism for Immediate MDT RLF information retrieval § Reporting mechanism UE capability signaling § Reporting contents § Reporting w. r. t duration timer/48 h timer LG Electronics RAN 2 Team

Motivation for MDT Extensive Manual Driving Tests for Coverage Optimization Time consuming and enormous cost Coverage problem LG Electronics RAN 2 Team

Assistance by UE measurements & reporting There are many UEs that can help network! MDT MDT Coverage problem LG Electronics RAN 2 Team

Two types of MDT Logged MDT Immediate MDT Measurements in Idle mode Logging measurements and reporting later on Measurement in Connected mode Immediate reporting e. g. , at RLF log Log RLF Coverage Hole LG Electronics RAN 2 Team

MDT initiation Management based trace function Originated from OAM command toward a (limited region of) PLMN without targeting a specific UE Signaling based trace function Originated from CN nodes Initial Context Setup message and Trace Start toward a E-UTRAN targeting a specific UE and a (limited region of) PLMN * OAM: Operations, Administration and Maintenance LG Electronics RAN 2 Team

Logged MDT - Logging No more measurements than normal idle mode measurements Logging interval IDLE logging measurement occasions Logging duration : radio measurements Periodical logging : 1280 ms~61440 ms logging duration : 10 min~120 min : detailed location info. (if available) : time stamp LG Electronics RAN 2 Team

Configuration validity - Duration Timer MDT configuration DL Logging interval CONNECTED IDLE logging Timer starts CONNECTED IDLE measurement occasions Logging duration MDT configuration released LG Electronics RAN 2 Team

Logging Area Scope for Logged MDT Configuration Area restriction for MDT logging List of global Cell IDs List of Tracking Area’s, or Location Area’s or Routing Area’s … MDT logging No logging Logging No MDT logging LG Electronics RAN 2 Team

Logging across RATs Single MDT configuration per UE MDT configuration is RAT-specific UMTS LTE MDT Config. LTE No logging Logging No log indication After mobility to other RAT No log indication No logging Logging After mobility to original RAT log indication Logging LG Electronics RAN 2 Team

Logging across PLMNs MDT PLMN: RPLMN of the UE at the moment of receiving MDT configuraiton Logging is performed if current RPLMN=MDT PLMN_B LTE MDT Config. PLMN_A No logging Logging No log indication After mobility to PLMN_B No log indication No logging Logging After mobility to original PLMN_A log indication Logging LG Electronics RAN 2 Team

Log Reporting Mechanism Log availability indication to network connection Setup connection Re-establishment handover (to target cell) Network then requests UE to report the log UE sends MDT log only upon request by network UE e. NB Connection setup request Connection setup complete : “I have a log” UE information request “LOG Request” UE information response “LOG Report” LG Electronics RAN 2 Team

Reporting Contents UE information Response Absolute Time stamp, Trace Info. LOG In each log entry LOG Ø Ø LOG LOG LOG … LOG LOG Ø Ø Serving cell’s CGI Measurements – Serving cell – 6 for intra-frequency neighbouring cells – 3 for inter-frequency neighbouring cells – 3 for GERAN neighbouring cells – 3 for UTRAN (if non-serving) neighbouring cells – 3 for E-UTRAN (if non-serving) neighbouring cells – 3 for CDMA 2000 (if serving is E-UTRA) neighbouring cells Elapsed time since the reception of logged MDT configuration Detailed Location information, if available (Log available) LG Electronics RAN 2 Team

Log Reporting duration timer running “Log Available” CONNECTED IDLE logging Timer starts UE information Response UL Log retrieval UE information Request RRCConnection Setup. Complete MDT configuration CONNECTED IDLE measurement occasions Logging duration MDT configuration released LG Electronics RAN 2 Team

Log reporting after duration timer expiry MDT configuration “Log Available” DL Log retrieval UL CONNECTED IDLE Logging Interval Logging Log retrieval “Log Available” UL/DL CONNECTED Idle mode measurements IDLE CONNECTED Logging Interval 48 hours Timer starts Logging duration Timer expiry MDT configuration released but MDT log is kept MDT log discarded, if any LG Electronics RAN 2 Team

Segmented Log Delivery LOG … LOG > Max RRC message size UE e. NB LOG Reporting by a single RRC message is not possible “I have a log” “LOG Request” LOG ‘Log report message #1’ “LOG Report” … LOG Log available indicator LOG ‘Log report message #2’ “LOG Request” “LOG Report” … LOG LG Electronics RAN 2 Team

MDT memory Handling Reserved for storing MDT log 8 KB Logging suspended, 48 h timer starts If full “Log Available” RRCConnection Setup. Complete Log request UL IDLE DL Log Report + “Log available” LOG Log request Log Report LOG LOG CONNECTED IDLE Logging suspended 48 h timer starts LG Electronics RAN 2 Team

Logged MDT - Procedure e. NB #1 UE e. NB #2 MDT Server MDT Configuration RLF MDT Measurement Logging (Signal strength, Location) RRC Connection Re-establishment Request I have MDT log RRC Connection Re-establishment Complete Log available indication Oh~ Give me MDT log MDT Measurement Reporting UE Information Request Here it is. UE Information Response Measurement logging RLF Measurement Result + current time LG Electronics RAN 2 Team

Immediate MDT For Immediate MDT, the configuration is based on the existing RRC measurement procedures for configuration and reporting Some extensions for inclusion of location information are made Detailed Location information can be included in A 2 report A 2 : Serving becomes worse than threshold Measurements for Immediate MDT M 1: RSRP and RSRQ measurement by UE § Event A 2 is used (serving cell becomes worse than threshold) M 2: Power Headroom (PH) measurement by UE M 3: Uplink signal strength/SINR measurement by e. NB RLF reporting can be considered as immediate MDT LG Electronics RAN 2 Team

Immediate MDT – retrieval of RLF info. MDT configuration RLF log indication Log retrieval RRCConnection Reestablishment. Complete CONNECTED Connected mode measurements RLF Re-establishment CONECTECD Logging Signal strength, location LG Electronics RAN 2 Team

RLF info. surviving reestablishment failure MDT configuration Log retrieval RLF log indication RRCConnection Setup. Complete CONNECTED Connected mode measurements RLF Logging Re-establishment Failure IDLE CONNECTED MDT log remains at Re-establishment failure Signal strength, location UE can discard RLF info 48 hour after the radio link failure is detected LG Electronics RAN 2 Team

RLF reporting Procedure e. NB #1 UE e. NB #2 MDT Server MDT Configuration RLF MDT Measurement Logging (Signal strength, Location) RRC Connection Re-establishment Request I have MDT log RRC Connection Re-establishment Complete Log available indication Oh~ Give me MDT log MDT Measurement Reporting UE Information Request Here it is. UE Information Response Measurement logging RLF Measurement Result + current time LG Electronics RAN 2 Team

UE capability signaling Logged MDT functionality is an optional feature Two UE capability bits on logged MDT can be signaled to network 1 1 1 capability bit regarding logged MDT support 1 capability bit regarding stand-alone GNSS positioning Immediate MDT functionality is an mandatory feature As existing RRC measurement procedures are reused with small extension of logging detailed location, this feature is mandatory LG Electronics RAN 2 Team

Reference Technical Specification 3 GPP TS 37. 320: UTRA and E-UTRA Radio measurement collection for Minimization of Drive Tests (MDT); Overall description; Stage 2 3 GPP TS 36. 331: E-UTRA RRC specification; Stage 3 3 GPP TS 36. 304: E-UTRA Idle mode specification; Stage 3 3 GPP TS 32. 422: Subscriber and equipment trace; Trace control and configuraiton management LG Electronics RAN 2 Team