3GPP Machine TypeCommunications Overview

Abhishek Roy

System Design Lab,

Samsung Electronics, Suwon.

abhishek.roy@samsung.com

Outline 3GPP MTC standards

3G PP Basic MTC architecture

MTC Characteristics

MTC 3GPP Release 10 featuresRAN and CN Congestion/Overload protection

MTC 3GPP Release Work ItemsMTC Low Cost Model

3GPP New MTC ArchitectureServices Capability LayerMTC Inter Working Function (IWF)

A key segment in future cellular mobile packet data networks

Initial 3GPP focus on the ability to differentiate MTC -type devices

Allows the operator to selectively handle such devices in congestion/overload situations

Low priority indicator has been added to the relevant UE-network procedures

Overload and Congestion control is done on both core network and radio access network based on this indicator

M2M is recognized as a key segment

in future cellular mobile packet data

networks

Initial 3GPP efforts have focused on the

ability to differentiate MTC-type devices

This allows the operator to selectively handle

such devices in congestion/overload situations

Low priority indicator has been added to the

relevant UE-network procedures

Overload and Congestion control is done on both

core network and radio access network based on

this indicator

Source 3GPP (http://www.3gpp.org)

Two main features addressing network overload: Core Network overload control

– UTRAN, E-UTRAN and GERAN

RAN overload control

– GERAN-only (EAB - Extended Access Barring)

RAN capabilities standardized in Rel-10 Ability to configure MTC devices as (access) delay tolerant UEs

•“intended for use with MTC Devices that can delay their data transfer”

UTRAN and E-UTRAN

•‘Delay-tolerant’ indication sent by low-priority access UEs to RAN at RRC setup

•‘Extended wait time’ (up to 30min) sent by the RAN to low-priority access UEs

GERAN

•Core Network Overload: An Implicit reject mechanism (& reject timer up to 200 sec) is defined for the BSC to reject all devices configured for low priority access

•RAN overload: EAB, a MTC-specific broadcast mechanism for access barring

Extended Access Barring (EAB)

Extends legacy Access Control Barring (ACB), which can bar ALL UEs in a cells

EAB requirements/functions for GERAN Rel-10 • EAB applies to Mobile Originated (MO) calls only, except emergency calls

• The UE is configured for EAB by the HPLMN. EAB shall be applicable regardless of whether the UE is in a Home or a Visited PLMN

• If a UE, configured for EAB is a member of an Access Class 11-15 permitted by the network, then the UE shall ignore EAB

Special Access Classes(SIM based) not subject to EAB

AC 11: Reserved for the network operator; AC 12: Security Services (Police, Surveillance) AC 13: Public Services (Electricity,Distribution,etc); AC 14: Emergency ServicesAC 15: Reserved for the staff of the operator(eg. to on-site maintenance technicians

EAB information shall include barring information for Access Classes 0-9, plus the differentiation of the following 3 sub-categories

–A: The EAB Authorization mask is applicable to all mobile stations configured for EAB.

–B: The EAB Authorization mask is only applicable to mobile stations configured for EAB and registered neither in their HPLMN nor in a PLMN that is equivalent to it

–C: The EAB Authorization mask is only applicable to mobile stations configured for EAB and registered neither in the PLMN listed as most preferred PLMN of the country where the UE is roaming in the operator-defined PLMN selector list on the SIM/USIM, nor in their HPLMN nor in an PLMN that is equivalent to it

Few parallel Work/Study Items are ongoing in Rel-11 (still open)

–Two study Items on RAN improvements for Machine-Type Communications were started in 4Q ‘09 for GERAN and (E)UTRAN, as follow-up from Rel-10

–One large umbrella WI, System Improvements to Machine-Type Communications (SIMTC), started in May 2010, including

Many System/Core Network features and enhancements One Work Item, common for UTRAN and EUTRAN, on RAN overload control

–One study item on Study on Provision of low-cost MTC UEs based on LTE (FS_LC_MTC_LTE) was started in Sept. 2011

Motivations

–Continue to enhance MTC related system/UE performance

Specific motivations for different SI/WIs are described.

EAB (Extended Access Barring) for (E)UTRAN

–Providing RAN (and CN) overload control –Includes overload control for shared RANs

Low cost MTC for LTE –Enabling “low cost” LTE M2M devices in the future

Further enhancements to RAN overload control –Under study for both GERAN and (E)UTRAN –Details can be found in related 3GPP TRs:

•TR 37.868: Study on RAN Improvements for Machine-type Communications

•TR 43.868: GERAN Improvements for Machine-type Communications

Study Item

–Target is Rel-12

• Proposals in 3 main areas: Radio (RF), Baseband, Operation

–Five techniques are discussed in RAN1 for cost reduction:

•Reduction of maximum bandwidth

•Single receiver RF chain •Reduction of peak rate •Reduction of transmit power •Half duplex operation