SECTION 3
900 MHz SYSTEM OPERATION
3-1. ACCESS METHOD3-2. PROTOCOL
1. Transfer format & rate1. General
The transfer format & rate of our system is as fTollohis system realizws;es the TX/RX superframe by TDD system. The
relation of master/slave dose not decide identification regarding
Table 3-1. Transfer methodthe protocol between BS and HS, but the initiated side is the mas-
Access methodFDMA-TDDter and the requested side is the slave when the RF link has been
established.
Channel number20 channel
Channel spacing1.2 MHz2. Initial acquisition
Modulation methodDBPSKIn order to establish the RF link between BS and HS, both of BS
Baseband transfer rate960 Kbpsand HS need to have the same system ID. When Opower� is ap-
Spread methodDirect Sequence Spread Spectrumplied to this system, the system have to do Initial Acquisition in
order to have the same system ID. It is to exchange a parameter
Chip rate12 chips/bit
Data transfer rate80 Kbpswhen the HS is parked on the BS, as soon as the system do System
Parameters Re-initialization.
3. System parameter re-initialization
2. Channel Number & Frequencies
RF channels occupy the frequency band 902 � 928 MHz are num-This System Parameters Re-initialization can realize that the HS
is parked on the BS. So after the BS recognized to be parked the
bered 1 to 20.HS, the BS calculates a system parameter, and then it outputs this
RF channel numbers & center frequencies are specified as fol-data from the ARTO port, and then the system establishes the RF
lows.
link. In order to establish this link, the HS send the A-Frame to the
BS after the HS received the system parameter, and then the BS
Table 3-2. Channel number & Channel frequencysend the A-Frame to the HS. The process of System Parameters
Re-initialization is as follows.
ChannelChannel CenterChannelChannel Center
NumberFrequency (MHz)NumberFrequency (MHz)
1903.611915.6
2904.812916.8Base StationHandset
3906.013918.0
4907.214919.2
5908.415920.4(PARK)
6909.616921.6
(Park Detect)(Park Detect)
7910.817922.8
8912.018824.0
System Parameters
9913.219925.2
10914.420926.4
A-Frame
System ID
confirmed
A-Frame
System ID
confirmed
Fig. 3-1. System Parameters Re-initialization
15 |
ACEC
SONY
