I want to speak about messages in CDMA , how it sent and what the call processing
** In CDMA, most call processing events are driven by messages.
** Some CDMA channels exist for the sole purpose of carrying, they never carry user’s voice traffic.
• Sync Channel (a forward channel).
• Paging Channel (a forward channel).
• Access Channel (a reverse channel).
• On these channels, there are only messages, continuously all of the time.
** Some CDMA channels exist just to carry user traffic.
• Forward Traffic Channel.
• Reverse Traffic Channel.
• On these channels, most of the time is filled with traffic and messages are sent only when there is something to do.
** All CDMA messages have very similar structure, regardless of the channel on which they are sent.
** CDMA messages on both forward and reverse traffic channels are normally sent via dim-and-burst.
** Messages include many fields of binary data.
** The first byte of each message identifies message type: this allows the recipient to parse the contents.
** To ensure no messages are missed, all CDMA messages bear serial numbers and important messages contain a bit requesting acknowledgment.
** Messages not promptly acknowledged are retransmitted several times. If not acknowledged,
the sender may release the call.
** Field data processing tools capture and display the messages for study.
** In CDMA, most call processing events are driven by messages.
** Some CDMA channels exist for the sole purpose of carrying, they never carry user’s voice traffic.
• Sync Channel (a forward channel).
• Paging Channel (a forward channel).
• Access Channel (a reverse channel).
• On these channels, there are only messages, continuously all of the time.
** Some CDMA channels exist just to carry user traffic.
• Forward Traffic Channel.
• Reverse Traffic Channel.
• On these channels, most of the time is filled with traffic and messages are sent only when there is something to do.
** All CDMA messages have very similar structure, regardless of the channel on which they are sent.
** CDMA messages on both forward and reverse traffic channels are normally sent via dim-and-burst.
** Messages include many fields of binary data.
** The first byte of each message identifies message type: this allows the recipient to parse the contents.
** To ensure no messages are missed, all CDMA messages bear serial numbers and important messages contain a bit requesting acknowledgment.
** Messages not promptly acknowledged are retransmitted several times. If not acknowledged,
the sender may release the call.
** Field data processing tools capture and display the messages for study.
