The CDMA reverse link uses a different coding scheme to transmit data. Unlike the forward link, the reverse link cannot support a pilot channel for synchronous demodulation (since each mobile station would need its own pilot channel). The lack of a pilot channel is partially responsible for the reverse link’s lower capacity than the forward … Read more
The Base Station transmitter signal is, however, the composite of many channels (with a minimum of four). The Pilot channel is unmodulated (Walsh code 0); it consists of only the final spreading sequence (short sequences). The Pilot channel is used by all mobiles linked to a cell as a coherent phase reference and also provides … Read more
If a mobile device moves to a new network and keeps the same IP address, the address will not reflect its new location therefore routers will be unable to route datagram to it correctly (or at all). Alternatively, if a mobile device moves to a new network and gets allocated a new address, already established … Read more
Pilot Channel Physical Layer The Pilot channel is essentially the short codes operating on their assigned PN offset. This is accomplished by selecting Walsh code 0 which is 64 zeroes (remember, the first code in any Walsh code set is always composed of all zeroes) as the Walsh code modulation data. In addition, the channel … Read more
A number of different service options have been defined for use on the CDMA physical channel. A description of each of the service options follows: Service Option 001 – This is the normal, duplex voice conversation mode that uses the original 8 kbps vocoder defined in the TIA IS-96-A specification. Service Option 002 – This … Read more
After each access attempt, the mobile listens to the Paging Channel for a response from the base station. If the base station detects the access probe from the mobile, it responds with a channel assignment message. This message contains all of the information required to get the mobile onto a traffic channel. this messages includes … Read more