TAILIEUCHUNG - WiMAX Technology for Broadband Wireless Access 2007 phần 9

với một mức độ can thiệp kiểm soát. Coordinated cấu hình đồng bộ. Tất cả các công việc BSS trong chế độ đồng bộ và sử dụng các hoán vị tương tự. Một lớp trên có trách nhiệm cho việc xử lý của các phân bổ subchannel trong các lĩnh vực của trạm cơ sở, đảm bảo xử lý tốt hơn băng thông là đạt được | 14 Mobility Handover and Power-Save Modes Handover Considerations One of the major goals of the amendment is to introduce mobility in WiMAX. Consequently mobile WiMAX profiles are based on . Mobility is based on handover. Handover operation sometimes also known as handoff is the fact that a mobile user goes from one cell to another without interruption of the ongoing session whether a phone call data session or other . The handover can be due to mobile subscriber moves to radio channel condition changes or to cell capacity considerations. Handover is a mandatory feature of a cellular network. In this chapter the handover HO is described as defined in . In the two known generic types of handover are defined Hard handover also known as break-before-make. The subscriber mobile station MS stops its radio link with the first BS before establishing its radio link with the new BS. This is a rather simple handover. Soft handover also known as make-before-break. The MS establishes its radio link with a new BS before stopping its radio link with the first BS. The MS may have two or more links with two or more BSs which gives the soft handover state. The soft handover is evidently faster than the hard handover. Two types of soft handover are then defined in 2 Fast BS Switching FBSS . This is a state where the MS may rapidly switch from one BS to another. The switch is fast because the MS makes it without realising the complete network entry procedure with regard to the new BS. Macro Diversity HandOver MDHO . Transmissions are between the MS and more than one BS. In the mobile WiMAX profiles only the hard handover is mandatory. The FBSS and MDHO are optional. The standard also indicates that the support of the MDHO or FBSS is optional for both the MS and the BS. WiMAX Technology for Broadband Wireless Access Loutfi Nuaymi 2007 John Wiley Sons Ltd. ISBN 0-470-02808-4 220 WiMAX Technology for Broadband Wireless Access Handover .

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