Patent ID: 8885581

Claim:
A system comprising: one or more cell site base stations configured to transmit signals to a mobile unit located on a serving cell site, wherein the one or more cell site base stations are configured to perform communication with the mobile unit based on a wireless packet transmission protocol; wherein a serving cell site base station is configured to communicate with the mobile unit using a wireless packet transmission protocol; wherein the one or more cell site base stations are configured to transmit a time difference of arrival reference signal (TDOA-RS) that is usable for a time difference of arrival measurement to determine proximity location of the mobile unit on the network; wherein the TDOA-RS is included in one or more resource blocks; and wherein the one or more cell site base stations are configured to: transmit the TDOA-RS using a first subcarrier within the one or more resource blocks for a first transmission instance; transmit the TDOA-RS using a second subcarrier and not the first subcarrier within the one or more resource blocks for a second transmission instance; and transmit the TDOA-RS using one or more first resource elements that are reserved for the one or more cell site base stations, wherein one or more second resource elements that are reserved for one or more neighbor cell site base stations are not used by the one or more cell site base stations to transmit the TDOA-RS.