Method and system for user equipment location determination on a wireless transmission system

摘要

Neighbor cell hearability can be improved by including an additional reference signal that can be detected at a low sensitivity and a low signal-to-noise ratio, by introducing non-unity frequency reuse for the signals used for a time difference of arrival (TDOA) measurement, e.g., orthogonality of signals transmitted from the serving cell sites and the various neighbor cell sites. The new reference signal, called the TDOA-RS, is proposed to improve the hearability of neighbor cells in a cellular network that deploys 3GPP EUTRAN (LTE) system, and the TDOA-RS can be transmitted in any resource blocks (RB) for POSCH and/or MBSFN subframe, regardless of whether the latter is on a carrier supporting both PMCH and POSCH or not. Besides the additional TDOA-RS reference signal, an additional synchronization signal (TDOA-sync) may also be included to improve the hearability of neighbor cells.

主权项

1. 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; andtransmit 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.