Multi-carrier Handover Method IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE C802.16m-08/1007r1 Date Submitted: 2008-09-16.

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Multi-carrier Handover Method IEEE Presentation Submission Template (Rev. 9) Document Number: IEEE C802.16m-08/1007r1 Date Submitted: Source: Yih-Guang Jan, Yang-Han Lee, Ming-Hsueh Chuang, Hsien-Wei Tseng, Wei-Chieh Tseng, Po-Jung Lin, Ting-Chien Wang Tamkang University (TKU) Shiann-Tsong Sheu National Central University (NCU) Whai-En Chen National Ilan University (NIU) Venue: PHY: Multi-Carrier Operation; in response to the TGm Call for Contributions and Comments m-08/033 for Session 57 Base Contribution: N/A Purpose: Propose a Multi-carrier Handover method Notice: This document does not represent the agreed views of the IEEE 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 IEEEs name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEEs 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 Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and. Further information is located at and.

Introduction In this contribution we will be based on the standard of m system to propose the multi-carrier handover process so that this handover mechanism can be selected and implemented into the m system. In the discussion of multi-carrier handover mechanism we assume in our discussion that the system synchronization has completed therefore the synchronization process will not be discussed in this contribution. We will also in this contribution to discuss the effect of changing the hysteresis on the system drop rate and its resulting handover rate when the hysteresis changes with the mobile speed.

Illustrative Figures of Multi-carrier Handover As shown in the left figure is to illustrate the mobile station signal strength as MS moves away from BS1 and towards BS2. In the following we will discuss in detail the handover process.

Illustrative Figures of Multi-carrier Handover (1/3) When MS moves from BS 1 to Position 1 –Carrier 1 At point A as shown in the figure the MS received signal strength from BS 1 becomes weaker and it initiates the Carrier 1 to trigger Carrier 2 to ready for handover process. –Carrier 2 When it receives the trigger signal from Carrier 1, it executes the searching process to find the received signal strengths from the MS of those neighboring base stations to determine which BS will be used in the handover process.

Illustrative Figures of Multi-carrier Handover (2/3) When MS moves to around the location that has equal distances from two base stations –Carrier 1 MS receives the same signal strengths from BS 1 and BS 2 as shown at Point B, it triggers Carrier 2 to execute the handover. –Carrier 2 Carrier 2 receives the trigger signal from BS 1, it starts the execution of handover process, Carrier 2 selects the target Target BS from its searching process as discussed in the previous slide.

Illustrative Figures of Multi-carrier Handover (3/3) As MS is located at the marked position it has the signal strength at point C –Carrier 1 After Carrier 2 completes the handover process, Carrier 1 disconnects its connection with BS1. –Carrier 2 MS has reached the hysteresis level it determines to handover to BS 2.

System Flow Chart of Multi-Carrier Handover (1/2) We summarize in the following figure the system flow chart for multi- carrier handover and it will be considered and accepted as the handover routine in m system. Multi-carrier handover system flow chart: As MS moves into the system it starts to transmit data to the serving BS. When the MS receives equal signal strengths from its serving BS (carrier 1) and its neighboring BS (carrier 2), it starts the handover process and identifies this time point as T1, it then determines its target BS. When the received target BS signal strength is larger than the hysteresis value of the serving BS, it identifies this time instant as T2.

System Flow Chart of Multi-Carrier Handover (2/2) As the time difference of T2 and T1 is less then a to be determined constant χ seconds, it will be claimed as a successful handover, otherwise when the time difference is larger than χ seconds it will determine whether the MS receives signal strength is larger than the BS signal sensitivity, if it is, then it continues to proceed on the handover process, otherwise it fails the MS handover, the MS is dropped out the MS will re-start its network entering process and to proceed on the registration process. In this contribution in the simulation of handover process we take the time difference of χ as 1 second.

Text Proposal ===================Start of Proposed Text==================== 19 Support for Multi-carrier 19.x Multi-carrier Handover Method The Multi-carrier handover mechanism has the flow chart as shown in the following figure, where in the figure the points A, B, C and D represent the various received signal strengths during the handover process:

===================End of Proposed Text===================