Method and apparatus for performing identification of measurement channels in TDMA E-OTD

A mobile station comprising an RF transceiver having an RF transmitter and an RF receiver, said mobile station further comprising a controller coupled to the RF transceiver and being programmed for making measurement of neighbor base stations, said controller being programmed to (a) receive a measurement list of neighbor base stations from a serving base station, the list containing information for identifying at least one neighbor base station that transmits a frequency channel;

• (b) to tune said RF receiver to a frequency channel transmitted by the neighbor base station, the frequency channel containing a control channel to be used for making a time difference measurement;
• (c) to verify that the frequency channel is a correct frequency channel transmitted by the neighbor base station to be measured by receiving a traffic channel that is on the same frequency channel and by extracting from the received traffic channel certain information that can be used to identify the base station that transmits the traffic channel;
• (d) to compare the extracted information with the information for identifying the at least one neighbor base station that was received in the measurement list to ensure that the correct frequency channel is being received;
• (e) to make the time difference measurement between the neighbor base station and a reference base station using the control channel on the frequency channel;
• and (f) to associate the extracted information with the result of the measurement.

A method for making Enhanced Observed Time Difference (E-OTD) measurements with a mobile station, comprising:

• receiving from a neighbor base station a signal on a Digital Traffic Channel (DTC) time slot that is on the same frequency with a desired Digital Control Channel (DCCH) that is to be used for measuring the E-OTD;
• detecting and decoding a Coded Digital Voice Color Code (CDVCC) in the DTC to obtain a DVCC;
• verifying that the received signal is a correct signal for receiving the desired DCCH by comparing the received DVCC with a DVCC that forms a part of a base station neighbor list;
• and
• measuring the E-OTD using the desired DCCH and associating the DVCC and channel number and hyperband information with the E-OTD measurement to obtain an E-OTD measurement report that is transmitted to a Serving Mobile Location Center (SLMC).