Patent ID: 8774133

Claim:
A cell measurement method used in a mobile station camping on a serving cell, wherein the serving cell sends system information of neighbor cells to the mobile station, comprising: determining a first set of the neighbor cells based on a measurement rule for cell reselection, wherein the measurement rule defines which neighbor cells are needed to be measured when no radio link is established between the serving cell and the mobile station; determining a second set of the neighbor cells based on a report request for radio link establishment, wherein the report request is required to be sent when a dedicated channel is to be established between the serving cell and the mobile station; choosing a subset from the second set, wherein the subset is less than the second set; and measuring the neighbor cells of a union of the first set and the subset, wherein the neighbor cells of the union are measured when a report on Random Access Channel (RACH) is required according to the report request; wherein the cell measurement method further comprises sending the report on RACH including a measurement result of the neighbor cells of the subset to the serving cell when a radio link is required to be established; wherein the subset is chosen by assigning each of the neighbor cells of the second set a corresponding measurement period and choosing the subset from the second set according to the corresponding measurement periods; and wherein each of the corresponding measurement periods is a multiple of a discontinuous reception (DRX) cycle length.