CDMA communication system capable of flexibly assigning spreading codes to a channel in accordance with traffic

A code division multiple access (CDMA) communication method using a common frequency band at a forward channel and a reverse channel, said CDMA communication method comprising the steps of:

• detecting traffic in said reverse channel to produce a first detected signal indicative of the traffic in said reverse channel;
• assigning reverse spreading codes to said reverse channel to make, in response to said first detected signal, number of said reverse spreading codes change;
• detecting traffic in said forward channel to produce a second detected signal indicative of the traffic in said forward channel;
• and
• assigning forward spreading codes to said forward channel to make, in response to said second detected signal, number of said forward spreading code change.

A code division multiple access (CDMA) communication system comprising a mobile station and a base station which communicate with each other using a common frequency band at a forward channel and a reverse channel,

• said mobile station comprising:
• mobile detecting means for detecting traffic in said reverse channel to produce a reverse traffic detected signal indicative of the traffic in said reverse channel;
• and
• mobile assigning means for assigning reverse spreading codes to said reverse channel, said mobile assigning means making, in response to said reverse traffic detected signal, the number of said reverse spreading codes change,
• said base station comprising;
• base detecting means for detecting traffic in said forward channel to produce a forward traffic detected signal indicative of the traffic in said forward channel;
• and
• base assigning means for assigning forward spreading codes to said forward channel, said base assigning means making, in response to said forward traffic detected signal, the number of said forward spreading code change.

A method of communicating between a mobile station and a base station in a code division multiple access (CDMA) communication system using a common frequency band at a forward channel and a reverse channel, said method comprising the steps of:

• detecting, in said mobile station, traffic in said reverse channel to produce a reverse traffic detected signal indicative of the traffic in said reverse channel;
• assigning, in said mobile station, reverse spreading codes to said reverse channel to make, in response to said reverse traffic detected signal, number of said reverse spreading codes change;
• detecting, in said base station, traffic in said forward channel to produce a forward traffic detected signal indicative of the traffic in said forward channel;
• and
• assigning, in said base station, forward spreading codes to said forward channel to make, in response to said forward traffic detected signal, number of said forward spreading code change.