Cell search method in discontinuous reception mode in a mobile communication system

A cell search method in a mobile station that receives a neighbor list, comprising the steps of:

• determining an off-line cell search;
• buffering received data from a decimator into a memory;
• turning off an RF (Radio Frequency) module;
• and
• reading the data determined by a memory address from an index of a 1st correlation value;
• and
• performing the off-line cell search using the read data.

A cell search method in a mobile station that receives a neighbor cell list, comprising the steps of:

• determining at least one searchable cell if the neighbor cell having signal strengths greater than a threshold, said threshold indicating handover probable cell having signal strength;
• searching the determined searchable cell for a first predetermined time;
• and
• updating the searchable cell after a second predetermined time.

A cell search method in a mobile terminal that operates in a discontinuous reception mode and receives a neighbor list from a Node B, comprising the steps of:

• turning on an RF (Radio Frequency) module;
• performing slot timing synchronization;
• buffering data received from at least one neighbor Node B included in the neighbor list;
• turning off the RF module;
• and
• performing an offline cell search using the buffered data.

A cell search method in a mobile terminal that receives a neighbor list from a Node B, comprising the steps of:

• measuring the strengths of signals received from at least one neighbor Node B included in the neighbor list;
• determining neighbor cells having signal strengths greater than a threshold, said threshold indicating handover probability;
• and
• performing a cell search on the determined neighbor cells.

A cell search method in a mobile terminal that receives a neighbor list from a Node B, comprising the steps of:

• measuring the energy levels of an active set of a plurality of Node B in the neighbor list when the mobile terminal wakes up from sleep;
• comparing the energy levels with a threshold;
• omitting a cell search of a particular Node B if the energy level of the particular Node B is greater than the threshold;
• and
• performing a cell search on a plurality of Node B if the energy level of the plurality of Node B is less than the threshold and transitioning to a sleep mode.

A cell search method in a mobile terminal that receives a neighbor list from a Node B, comprising the steps of:

• measuring the energy of neighbor at least one Node B in the neighbor list;
• determining if neighbor cells have signal strengths greater than a threshold, said threshold indicating handover probability;
• and
• performing an offline cell search on the determined neighbor cells.