887 results about "Timing advance" patented technology

The present invention proposes a method of sending a UE the timing advance information per carrier group promptly and commanding preamble transmission, and activating secondary carriers in a wireless communication system supporting carrier aggregation technology using uplink transmission timings for the respective carrier groups. Through the present invention, the UE is capable of configuring the timing advance information of the carrier group promptly and activating the secondary carrier quickly, resulting in reduction of uplink transmission delay.

The invention relates methods for time aligning uplink transmissions by a mobile terminal in a mobile communication system, and to methods for performing a handover of a mobile terminal to a target aggregation access point. The invention is also providing apparatus and system for performing these methods, and computer readable media the instructions of which cause the apparatus and system to perform the methods described herein. In order to allow for aligning the timing of uplink transmissions on uplink component carriers, where different propagation delays are imposed on the transmissions on the uplink component carriers, the inventions suggests to time align the uplink component carriers based on a reference time alignment of a reference cell and a reception time difference or propagation delay difference between the downlink transmissions in the reference cell and the other radio cells, the uplink component carriers of which need to be time aligned.

Provided are a method for controlling uplink transmission power and a wireless device. The wireless device decides a first transmission power of a first uplink channel, which is transmitted through a first wireless resource from a first serving cell, and decides a second transmission power of a second uplink channel, which is transmitted through a second wireless resource from a second serving cell. The first serving cell belongs to a first timing advance (TA) group, and the second serving cell belongs to a second TA group that differs from the first TA group. All or a portion of the first wireless resource and the second wireless resource overlap, wherein the sum of the first and second transmission powers in the overlapping portion is decided so as not to exceed a maximum transmission power.

A method for uplink synchronization in a multi-carrier system includes the following steps: a base station selects one or more first component carriers, which do not establish the uplink synchronization with the base station, from multiple component carriers supported by a terminal; then the base station obtains Timing Advance (TA) needed by the terminal to perform the uplink transmission on the first component carriers, and sends the TA information to the terminal; the terminal performs the uplink transmission on said first component carriers according to said TA. The application of the present invention enables the establishment of uplink synchronization between the base station and the user equipment in multi-carrier system.

A system for wirelessly locating mobile station / units (MS) and using resulting location determinations for providing a product or service is disclosed. The system is useful for routing an MS user to a plurality of desired locations, alerting an MS user to a nearby desired product or service based on satisfaction of user criteria, and providing enhanced security and 911 response. In one embodiment, the system responds to MS location requests via, e.g., Internet communication between a distributed network of location processing sites. A plurality of locating technologies including those based on: (1) TDOA; (2) pattern recognition; (3) timing advance; (5) GPS and network assisted GPS, (6) angle of arrival, (7) super resolution enhancements, and (8) supplemental information from low cost base stations can be activated, in various combinations, by system embodiments. MS location difficulties resulting from poor location accuracy / reliability and / or poor coverage are alleviated via such technologies in combination with automatically adapting and calibrating system performance according to environmental and geographical changes so that the system becomes progressively more comprehensive and accurate. Further, the system can be modularly configured for use in location signaling environments ranging from urban, dense urban, suburban, rural, mountain to low traffic or isolated roadways. Accordingly, the system is useful for 911 emergency calls, tracking, routing, people and animal location including applications for confinement to and exclusion from certain areas.