Title: Type: Arial Bold Size ： 32-36pt Color ： The theme blue Subtitle: Type ： Arial Size ： 24pt Color: The theme gray 1 TSG-C SWG2.2 Title: Idle Load balancing between eHRPD and LTE Source: ZTE Corporation, Yuanfang Yu, Ting Lu, Yonggang, Abstract: This contribution provides a solution to distribute idle users between eHRPD and LTE for load balancing. Date: Nov 28, Recommendation: Review and adopt for C.S0087-A v3.0. © 2012 The contributors grants a free, irrevocable license to 3GPP2 and its Organizational Partners to incorporate text or other copyrightable material contained in the contribution and any modifications thereof in the creation of 3GPP2 publications; to copyright and sell in Organizational Partner's name any Organizational Partner's standards publication even though it may include all or portions of this contribution; and at the Organizational Partner's sole discretion to permit others to reproduce in whole or in part such contribution or the resulting Organizational Partner's standards publication. the contributors is also willing to grant licenses under such contributor copyrights to third parties on reasonable, non-discriminatory terms and conditions for purpose of practicing an Organizational Partner's standard which incorporates this contribution. This document has been prepared by the contributors to assist the development of specifications by 3GPP2. It is proposed to the Committee as a basis for discussion and is not to be construed as a binding proposal on the contributors specifically reserves the right to amend or modify the material contained herein and to any intellectual property of the contributors other than provided in the copyright statement above.

Title: Type: Arial Size ： 30-32pt Color ： The theme blue Text (1-5 Level): Type ： Arial Size ： 28~12pt Color ： Black G91, B170 G137, B207 G174, B239 G171, B189  Background  Requirement from China Telecom at Nanjing meeting, refer to [C CT-Requirement for loading balance between eHRPD and E-UTRAN].  Existing idle reselection mechanisms defined in C.S0087 always trigger UE to E-UTRAN which may not achieve the reasonable load balancing between LTE and eHRPD  Two approaches defined in C.S0087 idle reselection based on the comparision of ServingPriority/ EARFCNPriority and E-UTRAN signal strength idle reselection based on E-UTRAN signal strength in case without ServingPriority/EARFCNPriority Load balancing between eHRPD and E-UTRAN 2

Title: Type: Arial Size ： 30-32pt Color ： The theme blue Text (1-5 Level): Type ： Arial Size ： 28~12pt Color ： Black G91, B170 G137, B207 G174, B239 G171, B189  A new GAUPable attribute EUTRADedicatedReselectionPriority is proposed.  EUTRADedicatedReselectionPriority is originated from subscription data or operator/vendor-based policy.  The negotiation of EUTRADedicatedReselectionPriority attribute is initiated by AN.  DedicatedPriorityEnabled and OtherRATPriorityThreshold are proposed.  Whether Dedicated Reselection Priority meachanism is activated or not is controlled by AN through DedicatedPriorityEnabled parameter.  DedicatedPriorityEnabled can be broadcasted by AN through overhead message (e.g. QuickConfig).  AN can activate Dedicated priority by setting DedicatedPriorityEnabled to 1 while necessary, e.g. Load increasing quickly.  OtherRATPriorityThreshold may also be broadcasted by AN, which can be used for further reselection control according to different load level, e.g. as LTE load increases, AN can set bigger OtherRATPriorityThreshold to limit the number of UEs which may perform idle reselection to LTE. Proposal 3

Title: Type: Arial Size ： 30-32pt Color ： The theme blue Text (1-5 Level): Type ： Arial Size ： 28~12pt Color ： Black G91, B170 G137, B207 G174, B239 G171, B189  Random Reselection mechanism between same dedicated priority is proposed. In case of too many users which have the same dedicated priority, Random reselection mechanism is proposed to further distribute users between H/L. Random reselection probability per priority is provided by the AN when necessary. AN can set different reselection probability for different priority, normally higher priority has the higher probability to reselect to LTE while LTE has a little big load.  If EUTRADedicatedReselectionPriority is provided and DedicatedPriorityEnabled is 1, then: If OtherRATPriorityThreshold is provided and LTEDedicatedReselectionPriority < OtherRATPriorityThreshold, then AT stays at HRPD unless the strength of HRPD is lower. If OtherRATPriorityThreshold is provided and LTEDedicatedReselectionPriority >= OtherRATPriorityThreshold, then AT reselects to LTE if all of the conditions are met: The strength of LTE is strong enough; EARFCNPriority > ServingPriority or EARFCNPriority < ServingPriority and HRPD is low enough if provided by OtherRATNeighborList. ATs meet the random reselection algorithm if Random Reselection mechanism is provided and the strength of HRPD is strong enough. E.g. Random value x[0,1] from AT < p which broadcast by AN per AT EUTRAN Priority Proposal (cont’) 4

Title: Type: Arial Size ： 30-32pt Color ： The theme blue Text (1-5 Level): Type ： Arial Size ： 28~12pt Color ： Black G91, B170 G137, B207 G174, B239 G171, B189 Idle reselection (Dedicated priority disabled) 5

Title: Type: Arial Size ： 30-32pt Color ： The theme blue Text (1-5 Level): Type ： Arial Size ： 28~12pt Color ： Black G91, B170 G137, B207 G174, B239 G171, B189 Idle reselection without Dedicated priority

Title: Type: Arial Size ： 30-32pt Color ： The theme blue Text (1-5 Level): Type ： Arial Size ： 28~12pt Color ： Black G91, B170 G137, B207 G174, B239 G171, B189 Idle reselection (Dedicated priority enabled) 7

Title: Type: Arial Size ： 30-32pt Color ： The theme blue Text (1-5 Level): Type ： Arial Size ： 28~12pt Color ： Black G91, B170 G137, B207 G174, B239 G171, B189 Dedicated priority reselection (Threshold =5)

Title: Type: Arial Size ： 30-32pt Color ： The theme blue Text (1-5 Level): Type ： Arial Size ： 28~12pt Color ： Black G91, B170 G137, B207 G174, B239 G171, B189 Idle reselection with Dedicated priority and Random reselection mechanism 9

Title: Type: Arial Size ： 30-32pt Color ： The theme blue Text (1-5 Level): Type ： Arial Size ： 28~12pt Color ： Black G91, B170 G137, B207 G174, B239 G171, B189 Random Dedicated priority reselection (Threshold =5, possibility provided ) Reselection possiblity = 75% Reselection possiblity = 25%

Title: Type: Arial Size ： 30-32pt Color ： The theme blue Text (1-5 Level): Type ： Arial Size ： 28~12pt Color ： Black G91, B170 G137, B207 G174, B239 G171, B189 Legacy UEs still follow existing idle reselection mechanism Load balancing between LTE and eHRPD can be achieved through the approach defined in this proposal. EUTRADedicatedReselectionPriority The negotiation for EUTRADedicatedReselectionPriority between AT and AN provides a flexible way to deliver dedicated priority. DedicatedPriorityEnabled OtherRATPriorityThreshold DedicatedPriorityEnabled can be used to activate dedicated priority while necessary and provides more elaborate control of load distribution by working with OtherRATPriorityThreshold. Random Reselection Probability Per Priority Random Reselection Probability Per Priority can be used to further distribute users which have the same priority between eHRPD and LTE. Summary 11

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