[STDS-802-16] UL sync

["Vasanth.Rajan" <vasantha.rajan@CRANESSOFTWARE.COM>]

Hi all,

 

In IEEE STD 802.16-2004, 6.3.9.3 Obtain uplink parameters it is said

 

 

“The SS shall determine from the channel description parameters whether it may use the uplink channel. If the channel is not suitable, then the SS shall continue scanning to find another downlink channel. If the Channel is suitable; the SS shall extract the parameters for this uplink from the UCD. It then shall wait for the next DL-MAP message and extract the time synchronization from this message. Then, the SS shall wait for a bandwidth allocation map for the selected channel. It may begin transmitting uplink in accordance with the MAC operation and the bandwidth allocation mechanism.”

 

My question is from the above highlighted statement is

1. Time synchronization will be achieved during ranging process (right??) how come the DL-MAP msg gives that information?? and once the UL channel parameters are suitable the SS will it directly decode the UL-MAP in the current broadcast frame or will it decode the UL-MAP msg  of the next broadcast frame??

 

2. When the BS is powered-up initially & no SS are there in the N/W, the BS Transmits only the broad cast frame containing DL-MAP, DCD, UCD, and UL-MAP. The UL-MAP msg contains details of initial ranging start period; my question is whether the whole UL period is allocated for initial ranging (initially)??

thanks in advance

 

Vasanth