Single-carrier/ds-cdma packet transmitting method, uplink packet transmitting method in multi carrier/ds-cdma mobile communication system, and structure of downlink channel in multi carrier/ds-cdma mobile comunication system

A single carrier/DS-CDMA packet transmission method that expands a bandwidth of information symbols by a sequence of spreading codes, and transmits packets by use of spreading signals having an expanded bandwidth, comprising:

• assigning k (0<k<n) spreading codes of all N spreading codes to reservation demand packet transmission, and
• time-multiplexing and transmitting reservation demand packets and data packets.

A single carrier/DS-CDMA packet transmission method that expands a bandwidth of information symbols by a sequence of spreading codes, and transmits packets by use of spreading signals having an expanded bandwidth, comprising utilizing a short repetition period spreading code when expanding a bandwidth of reservation demand packets and data packets.

A single carrier/DS-CDMA packet transmission method that expands a bandwidth of information symbols by a sequence of spreading codes, and transmits packets by use of spreading signals having an expanded bandwidth, comprising:

• utilizing a short repetition period spreading code when expanding a bandwidth of reservation demand packets;
• and
• utilizing a long repetition period spreading code when expanding a bandwidth of data packets.

A single carrier/DS-CDMA packet transmission system having a base station and a plurality of mobile stations, wherein

• the base station assigns a predetermined time slot to reservation demand packet transmission in regard to part or all of spreading codes, and notifies a mobile station of an assigned reservation demand packet channel, and
• the mobile station transmits a reservation demand packet using the assigned time slot.

A single carrier/DS-CDMA packet transmission system having a base station and a plurality of mobile stations, wherein

• the base station assigns k (0<k<n) spreading codes of a total of N spreading codes to reservation demand packet transmission, and notifies a mobile station of an assigned reservation demand packet channel, and
• the mobile station transmits a reservation demand packet using the assigned spreading codes.

An uplink packet transmission method in a multi-carrier/DS-CDMA mobile communication system having n (n being a natural number equal to or more than two) subcarriers, comprising:

• setting up frames that define constant intervals in each communication channel of the subcarriers, and further setting up time slots by temporally dividing each of the frames into F pieces (F being a natural number equal to or more than two), and
• spreading, in a mobile station, a packet to be transmitted by spreading codes in synchronization with timing of the time slots, and transmitting the packet to the base station.

A downlink channel structure in a multi-carrier/DS-CDMA mobile communication system that expands a bandwidth of information symbols by a sequence of spreading codes and transmits spreading information signal obtained by the bandwidth expansion by using a plurality of subcarriers having predetermined frequency intervals, wherein

• a plurality of communication channels assigned to the respective subcarriers are divided into predetermined time frames and multiplexed, and
• the plurality of communication channels assigned to the respective subcarriers are configured to include a common-control channel shared by a plurality of users and communication channels specific to the respective users.