Wimax standards and Security The Wimax

Association L₁


=
Association L₁ provides the MSS’s association with coordination. In associa- tion L₁, the SBS provides association parameters to the MSS as shown in Fig- ure 7.1(6 and 7)—Part I. T_SBS4MSS is the average transmission time required between SBS and MSS. The MSS may request to perform association with coordination by sending the scanning interval allocation request (MOB_SCN- REQ) message to the SBS with scanning type 0b010. The SBS may also arrange for this type of association unilaterally by sending unsolicited the scanning interval allocation response (MOB_SCN-RSP) message. The SBS

will then coordinate the association procedure with the requested neighbor- ing BSs over the backbone as shown in Figure 7.1(6, 8, and 9). The average transmission time required between SBS and nBS is denoted as T_SBS4nBS. T_ID is the average time required to Internet delay. Each neighboring BS may assign the same code or transmission opportunity to more than one MSS, but not both. Then, the MSS will synchronize to the neighbor BS as shown in Fig- ure 7.1(7 and 9). The first frame immediately followed by the rendezvous time is denoted as T_R, including the uplink map (UL-MAP) transmitted time. The typical rendezvous time is between 0 and 500 ms [18]. Afterwards, the hand- over process will spend handover time T_RA, T_RR, and extract the description of the dedicated ranging region which will be set to 1. Therefore, we can get T_L1 , the service DT for L₁ scheme during the handover process by

^TL₁ ^{= T}MSS4SBS ^{+ T}SBS4nBS ^{+ T}R ^{+ T}RA ^{+ T}RR ^{+ T}ID ^{+ T}SYN ^(7.3)

3.