Expedited Hard Handover IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S802.16m-08/016 Date Submitted: January 16, 2008 Source: Baowei Ji, Changhoi Koo bji@sta.samsung.com, chkoo@samsung.com Samsung Telecommunications America Venue: Levi, Finland Base Contribution: TGm Call for comments on SDD, IEEE 802.16m-07/040 Purpose: Discuss the problem with Optimized Handover, and propose Expedited HHO to meet the requirement in 802.16m Notice: This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.16. Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: <http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and <http://standards.ieee.org/guides/opman/sect6.html#6.3>. Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and <http://standards.ieee.org/board/pat >.

Long HO Interruption Time in Conventional HHO Difficulty for meeting HO interruption time below 30 msec

Attempt of Optimized HHO (1/4)

Attempt of Optimized HHO (2/4)

Attempt of Optimized HHO (3/4) MS initiated HO process block diagram as seen by MS (in 802.16e)

Attempt of Optimized HHO (4/4) BS initiated HO process block diagram as seen by MS (in 802.16e)

Problem with Optimized HHO (1/4) Without parameter adjustment, especially timing adjustment, RNG-REQ might arrive outside of the guard interval, fails to be detected by the target BS.

Problem with Optimized HHO (2/4) Initial ranging shall use an initial ranging code in an initial ranging slot TDD: power and frequency could be adjusted autonomously after downlink synchronization Timing may not be adjusted without handshaking

Problem with Optimized HHO (3/4) Optimized HHO may incur even longer interruption time than conventional HHO does

Problem with Optimized HHO (4/4)

Proposed Expedited HHO (1/5)

Proposed Expedited HHO (2/5) Table 2- OFDMA Fast_First_Ranging_IE() format Syntax Size Notes Fast_First_Ranging_IE{   Extended UIUC 4 bits Fast_First_Ranging_IE() = 0x0B HO ID 8 bits Assigned by the targeting BS OFDMA symbol offset Subchannel offset 7 bits No. OFDMA symbols No. subchannels Ranging method 1 bit 0- Ranging over 2 symbols 1- Ranging over 4 symbols reserved 6 bits Shall be set to zero }

Proposed Expedited HHO (3/5) MS initiated HO process block diagram as seen by MS (in 802.16m)

Proposed Expedited HHO (4/5) BS initiated HO process block diagram as seen by MS (in 802.16m)

Proposed Expedited HHO (5/5) Table 3 (modified Table 290a) Extended UIUC Code Assignment for UIUC = 15 Extended UIUC (hexadecimal) Usage 00 Power_control_IE 01 reserved 02 AAS_UL_IE 03 CQICH_Alloc_IE 04 UL_Zone_IE 05 PHYMOD_UL_IE 06 Reserved 07 UL-MAP_Fast_Tracking_IE 08 UL_PUSC_Burst_Allocation_in_Other_Segment_IE 09 Fast_Ranging_IE 0A UL_Allcoation_Start_IE 0B Fast_First_Ranging_IE 0C … 0F

Conclusions Enhanced Handoff procedures and Messaging should be taken into 802.16m systems as a new discussion feature, because Conventional HHO cannot meet 802.16m requirement Optimized HHO may not function We propose to add a new section and/or description for the enhanced handoff operation in SDD The proposed Expedited HHO in this proposal could be one of solutions for meeting 802.16m requirements