August 2012 C2 – Company Confidential SOURCE: Jialin Zou, Satish Kanugovi, Orlett Pearson (Alcatel-Lucent)… satish.k ABSTRACT: A combined probability and priority grouping based idle traffic redistribution scheme is introduced in this proposal. The motivations and the merits of the scheme are described. TITLE: TSG-C RECOMMENDATION: Discuss and adopt. The source companies of this contribution grant 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 source companies of this contribution 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 source companies of this contribution 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 source companies of this contribution. The source companies of this contribution specifically reserves the right to amend or modify the material contained herein and to any intellectual property of The source companies of this contribution other than provided in the copyright statement above. Idle UE Re-distribution and Load Balance between HRPD and LTE

2 | | Motivations Requirement from China Telecom at Nanjing meeting, refer to [C CT-Requirement for loading balance between eHRPD and E-UTRAN]

UE Priority Class Definition and Provision New dedicated attribute UEReselectionPriority (URP) associated with a UE reselection priority class is proposed UE Reselection Priority Class is created from subscription data or operator/vendor-based policy, could be specified by the network during initial call setup 8 UE reselection priority class can be pre-defined by an operator and each class associated with a dedicated URP from 0 to 7 respectively The dedicated URP are assigned to a UE of the class during the initialization Per priority class based randomization can be enabled If randomization is enabled for a class, the UEs in the class will randomly generate a URP 3

4 | | URP Based Re-selection Procedures Upon the reception of the IWK overhead message broadcast by the BTS, the UE shall perform the following new URP reselection procedures  If the URP is lower than ServingPriority, the UE stays with HRPD –Follow the existing reselection procedures as if ServingPriority is higher than all the EARFCNPriority(s)  If the URP is equal to or higher than Servingpriority, the UE shall pick the LTE carrier with the EARFCNPriority value higher than but closest to the URP as the reselection target –Follow the existing reselection procedures as if the picked LTE carrier is ranked the highest priority  The highest value among servingPriority and EARFCNPriorities of all the carriers shall always be set to 7  If the URP is equal to 7, the UE shall pick the carrier with the priority 7 to stay or reselect to –Follow the existing reselection procedures

Option 1. Redistribution by Dedicated URP & Randomized URP UEClass_Priorityk_RAND, 1 bit for each UEClass  UEClass_Priorityk_RAND=0 means randomization is not performed in priority class k. The UE shall use their dedicated URP to perform URP reselection procedures  UEClass_Priorityk_RAND=1 means randomization is performed in priority class k. The UE randomly generates a URP over the range of existing carrier priority values (0 to 7) and use it to perform URP reselection procedures.  Now the pre-assigned dedicated URP is overwritten by randomly generated URP No matter whether the randomization bitmap is broadcasted or not, all legacy UEs will follow existing reselection procedure.

Example of combined per class re-distribution and intra class randomizations 6 | | Priority UEclass 7, 6, 5, 4 will be re-distributed to EUTRAN F3 Priority UEclass 3 will be re-distributed to EUTRAN F2 Priority UEclass 1, 0 stay with the HRPD serving carrier Priority UEClass 2 is randomized across the carriers

Example of the Idle UE Redistribution and Load Balance Following the URP Randomization Procedures 7 | |

 UEClass bitmap consists of UEClass reselection indicator and 1 bit randomization indicator  When UEClass bitmap(s) broadcasted, it indicates whether some UE classes go to EUTRAN or stay in eHRPD. If redirected to EUTRAN, URP based randomization may be enabled  If UE is indicated not using randomization procedures: If UE is indicated go to EUTRAN, the UE shall set eHRPD serving priority to lowest and follow existing reselection procedure  If UE is indicated using randomization procures: If UE is indicated go to EUTRAN, the UE shall randomly generate a URP and follow URP based LTE multi frequency reselection procedures If UE is indicated to stay in eHRPD, it will ignore randomization bit value, set eHRPD serving priority as highest and follow existing reselection procedures  No matter whether UEClass bitmap is broadcasted or not, all legacy UEs will follow existing reselection procedures Option2: Redistribution by UEClass bitmap and URP Randomization 8

 UEClass_k indicator (YELLOW), 1 bit for each UE class UEClass_k=0 means eAN indicates UEs of class k stay in eHRPD UEClass_k=1 means eAN indicates UEs of class k go to EUTRAN  Randomization Indicator: 1 bit for all UE Classes Randomization _indicator=0 means UEs of all class shall not be randomized Randomization _indicator=1 means UEs of all class shall be randomized Message Format of Option 2 UEClass_8 indicator 1 Bit … UEClass_2 indicator Randomizatio n _indicator UEClass_1 indicator 1 Bit UEClass reselection indicator randomization indicator 9