Timing advance configuration for multiple uplink component carriers
First Claim
1. A method for time aligning uplink transmissions by a mobile terminal in a mobile communication system, the mobile terminal being in communication with an aggregation access point, the method comprising the steps of:
- configuring the mobile terminal simultaneously with a time-aligned uplink reference cell and with a non-time-aligned uplink target cell, both cells being controlled by the aggregation access point,measuring, by the mobile terminal, transmission and/or reception time difference information relating to transmissions on the target cell and/or reference cell,determining, by the mobile terminal, a first target timing advance based on at least the measured transmission and/or reception time difference information and on a reference timing advance used for uplink transmissions on the time-aligned reference cell,time-aligning, by the mobile terminal, the uplink target cell by adjusting a timing for uplink transmissions on the uplink target cell based on the determined first target timing advance, andtransmitting the measurement results and/or the first target timing advance from the mobile terminal to the aggregation access point.
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Accused Products
Abstract
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.
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Citations
19 Claims
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1. A method for time aligning uplink transmissions by a mobile terminal in a mobile communication system, the mobile terminal being in communication with an aggregation access point, the method comprising the steps of:
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configuring the mobile terminal simultaneously with a time-aligned uplink reference cell and with a non-time-aligned uplink target cell, both cells being controlled by the aggregation access point, measuring, by the mobile terminal, transmission and/or reception time difference information relating to transmissions on the target cell and/or reference cell, determining, by the mobile terminal, a first target timing advance based on at least the measured transmission and/or reception time difference information and on a reference timing advance used for uplink transmissions on the time-aligned reference cell, time-aligning, by the mobile terminal, the uplink target cell by adjusting a timing for uplink transmissions on the uplink target cell based on the determined first target timing advance, and transmitting the measurement results and/or the first target timing advance from the mobile terminal to the aggregation access point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A mobile terminal for timing-aligning uplink transmissions in a mobile communication system, the mobile terminal being in communication with an aggregation access point, the mobile terminal comprising:
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a processor adapted to measure transmission and/or reception time difference information relating to transmissions on the target cell and/or reference cell, the mobile terminal being simultaneously configured with a time-aligned uplink reference cell and with a non-time-aligned uplink target cell, both cells being controlled by the aggregation access point the mobile terminal, the processor adapted to determine a first target timing advance based on at least the measured transmission and/or reception time difference information and on a reference timing advance used for uplink transmissions on the time-aligned reference cell, the processor and a transmitter adapted to time-align the uplink target cell by adjusting a timing for uplink transmissions on the uplink target cell based on the determined first target timing advance, and the transmitter adapted to transmit the measurement results and/or the first target timing advance from the mobile terminal to the aggregation access point. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A non-transitory computer readable medium storing instructions that, when executed by a processor of a mobile terminal, cause the mobile terminal to time align uplink transmissions in a mobile communication system, wherein the mobile terminal:
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is in communication with an aggregation access point and simultaneously configured with a time-aligned uplink reference cell and with a non-time-aligned uplink target cell, both cells being controlled by the aggregation access point, measures transmission and/or reception time difference information relating to transmissions on the target cell and/or reference cell, determines a first target timing advance based on at least the measured transmission and/or reception time difference information and on a reference timing advance used for uplink transmissions on the time-aligned reference cell, time-aligns the uplink target cell by adjusting a timing for uplink transmissions on the uplink target cell based on the determined first target timing advance, and transmits the measurement results and/or the first target timing advance from the mobile terminal to the aggregation access point.
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Specification