spaper11_slides - HandoffAlgorithmsinDynamicSpreadingWCDMA

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Handoff Algorithms in Dynamic Spreading WCDMA  System Supporting Multimedia Traffic -- Presented by Authors: Ju Wang, Jonathan C. L. Liu
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Back ground ± What is  Handoff   ? When the phone is  moving  away  from the area  covered by one cell  and entering  the area covered by  another  cell the call is transferred to the  second cell in order to avoid call termination when the phone gets outside  the range of the first cell.
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Back ground cont. ± Hard   Handoff: ± Break first, then connect. (usually in 200ms) ± Used in GSM. ± May lead to drop line. ± Soft   Handoff: ± Connect first, then Break. ± Feature of WCDMA ± “Seamless Connection”
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Back ground cont. Hard  Handoff: In the crossing moment, the  cell phone break the connection with Cell1, and  connect to Cell2 in 200ms. C2 C1 Soft  Handoff: In the period, the cell phone  connect to both Cell1 and Cell2. After the  Cell2 satisfy the conditions, the cell phone  will disconnect to Cell1 and handoff to  Cell2. C1 C2
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What the paper talks about? ± Reduce the  round time o f ha ndo ff. ± 1. It proposed  dynamic spreading soft handoff scheme . ± 2. It presents a new resource allocation algorithm which maximize the  throughput when SF and transmission power are jointly considered.
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Goals of handoff algorithm ± All handoff requests should be processed within a given time period, such that the  mobile can  smoothly migrate to the other cell. ± The algorithm should be able to handle 
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spaper11_slides - HandoffAlgorithmsinDynamicSpreadingWCDMA

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