LTE Release 11 Work and Study Items


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LTE Release 11 Work and Study Items

  1. 1. LTE Release 11 Work andStudy ItemsNovember 2011Eiko Seidel, Chief Technical OfficerNomor Research GmbH, Munich, GermanySummary Proposed SI on LTE Coverage Enhancements SI Approved3GPP TSG RAN meeting #53 was held in Study on Enhanced Uplink Transmission for SI on holdFukuoka, Japan, from Sep. 13 - 16, 2011, and LTEwas hosted by ARIB & TTC. The meeting had 154 Study on LTE Device to Device Discovery and SI postponed Communication - Radio Aspectsparticipants and 479 Technical Documents [1]. Study on Further Enhancements to LTE TDD forAt last RAN plenary meeting RAN#52, operators DL-UL Interference Management and Traffic SI on holdwere requested to provide a ranking of the Work Adaptationand Study Items (WIs/SIs) for Release 11. 35 New WI: Improvements to LTE Relay Backhaul WI postponedoperators provided their view which now allowsus to rank the work items according to the Highest priority of the operators lies withoperator’s priority. The tables of this report Coordinated Multi-Point (CoMP) transmission andprovide an excellent idea of the interest areas of reception [2]. Such techniques, including the usedifferent operators about the Release 11 work in of large scale Remote Radio Heads, have been3GPP. A general observation is that there is less recognized as a tool to improve the coverage, tooperator support for HSPA evolution in 3GPP than support high data rates, improve the cell-edgefor LTE enhancements. Still work will also throughput, and also to increase the systemprogress on some HSPA WI/SI. A lot of the capacity. CoMP will be the key feature of releaseWI/SIs anyway cover both technologies. 11. There are different flavors with varyingThe WG chairmen provided their view for the next complexity, involving more or less changes to themonths until March 2012. At the next plenary physical layer, the protocol and the X2 interface.Dec. 11 at RAN #54 they will review the situation After successful studies and the analysis of impactand have a discussion about the future handling. on specification, a Work Item is now created toNevertheless there will not be any new WI/SI prepare the Release 11 specification for this newdiscussed anymore, so this report should provide feature. Samsung is leader of this work item.the reader a full picture of LTE Release 11 Operator’s second priority is the enhancement ofactivities. Carrier Aggregation. As previously explained, we see Carrier Aggregation as the most importantRAN1 – Physical Layer Working Group feature of Release 10, and operators confirm thisGenerally RAN1 has a very high work load. The understanding by expressing the wish to improveRAN1 chairmen suggested that max 4 WIs/SIs are this feature. One of the key issue is to handlefeasible to be completed in time. In the next 6 multiple timing advances in LTE-A. This wouldmonths, the work in RAN1 will continue on the allow carriers of different sites to be scheduledtop 6 WI/SIs as shown by the green parts in the dynamically by a single scheduler.table below. Similarly to Release 10, an Enhanced Inter-cell Interference Coordination will play also a role in WI orTitle SI Status Release 11 to enable Heterogeneous Networks (HetNets) in a backwards compatible manner.WI/SI Coordinated Multi-Point Operation forLTE WI Approved This is addressed in a Work Item that will be executed in RAN1 and is called “Further EnhancedCore part: LTE Carrier AggregationEnhancements WI Approved Non CA-based ICIC for LTE”. For this WI, it wasCore part: Further Enhanced Non CA-based decided that no work will be done on the so called WI ApprovedICIC for LTE second priority items for the next 6 months. ThereStudy on further Downlink MIMO SI Approved is still REL-10 work ongoing which has to beenhancements for LTE-Advanced prioritized over REL-11 work. The same argumentProvision of low-cost MTC UEs based on LTE SI Approved holds for other earlier R10 WIs, like CA, MIMONomor Research GmbH / / / T +49 89 9789 8000 1/4
  2. 2. and eICIC. NSN suggested postponing Rel-11 RAN2 – Radio Access Protocol WGitems in RAN4 while Rel-10 discussions are still Similarly to RAN1 the RAN2 Chairmanongoing. Main work load is in RAN4 and the RAN4 recommended in the next 6 months to continueChairman will prioritize the work accordingly. on the top 6 WI/SIs.Overall these three work items represent the corework that will be done as part of Release 11 in Title WI or SI StatusRAN1 on the Physical Layer. Furthermore, thereare three supported Study Items, where Core part: LTE RAN Enhancements for WI Approveddepending on the outcome of the study, a Work Diverse Data ApplicationsItem might be created or not. Study on HetNet mobility enhancements SI ApprovedThe scope of the downlink MIMO WI (Study on for LTEDownlink MIMO Enhancement for LTE-Advanced) Enhancement of Minimization of Drive WI Approvedwas reduced. Open loop MIMO, including open Tests for E-UTRAN and UTRANloop MU-MIMO operation, will not be investigated New WI: Signalling and procedure foranymore. Possible enhancements for interference avoidance for in-device WI Approved coexistencedemodulation Reference Symbols for MIMO, New WI proposal: RAN overload controlincluding considerations on improved for Machine-Type Communications WI Approvedorthogonality for MU-MIMO and possibilities for Core part: Service continuity and locationDMRS overhead reduction is also not part of the information for MBMS for LTE WI Approvedwork item anymore. Study Item on Further RANAnother study deals with Machine-Type Improvements for Machine-type SI postponedCommunications (MTC), a market that is likely to Communicationshave some potential. Usually theses type of New Study Item Proposal for Radio Level Dynamic Flow Switching between 3GPP- SI postponeddevices and applications can be handled LTE and WLANadequately by the use of GSM/GPRS. As LTE New study item proposal for LTE anddeployments evolve, operators would like to SI postponed HSDPA Carrier Aggregationreduce the cost of overall network maintenance Core Part: Network-Based Positioningby minimizing the number of RATs and would like WI continue Support for LTEto promote a migration to LTE.The LTE coverage enhancements SI will be Highest priority was given to the WI LTE RANdiscussed over email to reduce time spend in the Enhancements for Diverse Data Applications [3].meetings. The idea is to enhance current mobile networks toQualcomm proposal on Device to Device better support smartphones, laptops, netbooks,communication was postponed due to lack of tablets and embedded modems running a widesupport by the operators. It can be assumed that variety of data applications, often in parallel. TheQualcomm will continue to push this work item diversity and unpredictable nature of applicationthat seems to be of high priority to them, since traffic profiles leads to challenges in optimisingthey already presented proprietary solutions for the network and in guaranteeing efficientDevice to Device communication on the market. operation under all use cases. RRC state controlChina Mobile made a lot of pressure on LTE TDD mechanisms and DRX configurations may beenhancements that were not supported by other optimised with particular applications in mind, butoperators not having any TDD spectrum. In these may not remain optimal as differentparticular, a study item for interference applications are installed/started/stopped on themanagement and traffic adaptation was discussed device, and as the consequent traffic profile of theAfter lengthy discussion to grant a special status device changes over time. RIM is leader of thisdue to its high importance for that market, is was work item.still concluded to put that Work Item on hold. It The scope of the eMBMS WI (Service continuityshould also be noted that already many WI/SI like improvements for MBMS for LTE) was reduced. InCoMP, CA aggregation enhancements cover FDD particular, the work on location-based services& TDD technologies at the same time. Supporting was removed. This basically concerns specificcompanies were CATT, CATR, Clearwire, CMCC, optimizations for services that may only beEricsson, HiSilicon, Huawei, Intel, ITRI, NII relevant for localized areas (smaller than theHoldings, Potevio, Samsung, ST-Ericsson, UK MBSFN area) e.g. location based servicesBroadband, and ZTE. It is expected that the selection or energy savings.issues will be discussed again in the December Although, Trueposition did not get any support formeeting. its Network-based position WI, they were able to continue on this work item since only work inNomor Research GmbH / / / T +49 89 9789 8000 2/4
  3. 3. RAN3 is required, a group which is not RAN4 – Radio Frequency and Performanceoverloaded. The reader might be aware of the Testing Working Grouplawsuit of TruePosition against Ericsson, Alcatel- RAN4 Chairman’s initial recommendation was thatLucent and Qualcomm that accuses the all RAN4-led WI/SIs could be handled. Thereforedefendants of blocking the adoption of most of the WI/SI’s were approved. NeverthelessTruePosition’s technologies into the new agreement could not be reached on three newstandards for LTE, which has been reported in the proposed WI/SIs, which were postponed to themedia. December 2011 plenary.RAN3 – Radio Access Interfaces WG WI or Title StatusAs RAN3 in general is not overloaded, alls WI/SI SIwith RAN3 in the lead have been accepted to Enhanced performance requirement for SI Approvedcontinue. LTE UE New SI: Study of RF and EMC Requirements for Active Antenna Array SI Approved Title WI or SI Status System (AAS) Base Station Study on Measurement of Radiated Further Self Optimizing Networks Performance for MIMO and multi- WI Approved SI Approved (SON) Enhancements antenna reception for HSPA and LTE Core part: Carrier based HetNet ICIC terminals WI Approved New SI: Passive InterModulation (PIM) for LTE SI Postponed handling for Base Stations New WI: Network Energy Saving for E- WI Approved E-UTRA medium range and MSR UTRAN medium range/local area BS class WI Approved Proposed WID: LIPA Mobility and requirements SIPTO at the Local Network RAN WI Approved Completion RF Requirements for Multi-band and WI Postponed Multi-standard Radio BTS Study on further enhancements for SI Approved HNB and HeNB Core part: Relays for LTE (part 2) WI Approved New SI: Mobile Relay for E-UTRA SI Approved EMC Requirements for Multi-Standard Mobile Terminals and Ancillary WI Postponed EquipmentAfter extensive standardisation of SON already in Study on Inclusion of RF Pattern Matching Technologies as a positioning SI ApprovedRel.8, 9 and 10, this work will further continue in method in the E-UTRANRelease 11 as part of the Work Item “Further SelfOptimizing Networks (SON) Enhancements” [4]. By far the biggest operator’s interest was seen forKey issues are further improvements of Mobility the Study Item “Enhanced performanceRobustness Optimization and an extension of the requirement for LTE UEs”. This SI will evaluateAutomatic Neighbor Relation function. New, feasibility and potential gain by advanced receivercomplex scenarios will be investigated such as at link and system levels to cope with growingunnecessary short stays of UEs when moving data traffic to support smart phones with variousacross a network or the avoidance of Intra-RAT applications and to improvement of systeminter-layer or inter-RAT ping-pongs by information capacity for the LTE systems. Particularly,exchange between the RATs. These events may mitigating inter-cell interference at the UE receiverbe especially relevant in case of HetNet would be desired to improve cell edge userdeployments, where a macro cell overlaps with throughput. This might be of particular interestseveral low power nodes. Another aspect is the for HetNets with low power nodes within theRAT selection based on QoS related information macro cell coverage which might even applyor coordination between Mobility Robustness range expansion. Spatial domain interferenceOptimization and other traffic steering or load mitigation such as Interference Rejectionbalancing algorithms. Combining might be the candidate technologies.Mobile relays will focus only on RAN3 aspects forthe next 6 months, and is of lower priority in LTE-Advanced Carrier Aggregation bandgeneral. Since, some work of RAN1 and RAN2 is combinationslikely to be required it seems to be uncertain if aRel.11 Work Item can be created later on. The work items related to the different bands forA major impact on RAN3 can be expected on LTE-A CA have not been part of the priorisationCoordinated Multipoint transmission in case RAN1 process. This work is of highest priority todecides to standardize X2-based CoMP schemes. introduce Carrier Aggregation in different markets.Nomor Research GmbH / / / T +49 89 9789 8000 3/4
  4. 4. In the next table we provide an overview of band Referencescombinations for which Release 11 Work Itemshave already been approved to support Carrier [1] RP-11xxxx, Draft Report of 3GPP TSGAggregation. Since there is a large number of RAN meeting #53, Fukuoka, Japan, Sep.WIs, a high work load can be assumed until all of 13 – 16, 2011them can be completed for Release 11. [2] RP-111117 Work Item Description, Coordinated Multi-Point Operation for WI or SI Status LTE, Samsung, 3GPP TSG RAN meeting Combination #53, Fukuoka, Japan, Sep. 13 – 16, 2011 Band 3 + Band 7 WI [3] RP-111123 Work Item Description, Approved Proposed Update for LTE RAN Band 4 + Band 13 WI Approved Enhancements for Diverse Data Applications, RIM, 3GPP TSG RAN WI meeting #53, Fukuoka, Japan, Sep. 13 – Band 4 + Band 17 Approved 16, 2011 WI [4] RP-111110 Work Item Description, Band 20 + Band 7 Approved Further Self Optimizing Networks (SON) WI Band 5 + Band 12 Approved enhancements, Nokia Siemens Networks [5] 3GPP TS 36.104 V10.4.0 (2011-09) TSG WI RAN; Evolved Universal Terrestrial Radio Band 4 + Band 12 Approved Access (E-UTRA); Base Station (BS) radio WI FLO + Band 2 Approved transmission and reception (Release 10) WI Band 2 + Band 17 Approved Disclaimer: This information, partly obtained from official meeting reports, is assumed to be reliable, but WI Band 4 + Band 5 Approved do not necessarily reflects the view of Nomor Research GmbH. The report is provided for informational purpose WI only. We do not accept any responsibility for the Band 5 + Band 17 Approved content of this newsletter. Nomor Research GmbH has WI no obligation to update, modify or amend or to Band 20 + Band 3 Approved otherwise notify the reader thereof in the event that any matter stated herein, or any opinion, projection, WI forecast or estimate set forth herein, changes or Band 20 + Band 8 Approved subsequently becomes inaccurate. WI Band 1 + Band 3 Approved Band 4 + Band 7 WI Note: This newsletter is brought to you by Approved Nomor Research GmbH. Documents can be Band 1 + Band 7 WI obtained from Feel free to Approved forward this issue in electronic format. Please Band 41 (intra-band CA) WI Approved contact us in case you are interested related consultancy services or products. WI Band 38 (intra-band CA) Approved WI LTE Small Cell Protocol Stack Band 7 (intra-band CA) Approved Band 25 (intra-band CA, non WI Approved LTE Training Courses contiguous) overview of the detailed parameter for all LTE Standardisation Supportdifferent standardised LTE bands can be found in[5]. Public LTE Standards Discussion Forum Research GmbH / / / T +49 89 9789 8000 4/4