Timing advance configuration for multiple uplink component carriers
First Claim
1. A method, comprising:
- configuring a mobile terminal with a time-aligned uplink reference cell;
measuring, by the mobile terminal, downlink reception time difference information between a beginning of a first downlink subframe on a target cell that is a non-time-aligned uplink target cell and a beginning of a second downlink subframe on the reference cell, wherein the first downlink subframe and the second downlink subframe refer to a same subframe number;
determining, by the mobile terminal, a first target timing advance based on at least the measured 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
performing a handover of the mobile terminal to the target cell based on the measurement results and the first target timing advance.
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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
12 Claims
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1. A method, comprising:
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configuring a mobile terminal with a time-aligned uplink reference cell; measuring, by the mobile terminal, downlink reception time difference information between a beginning of a first downlink subframe on a target cell that is a non-time-aligned uplink target cell and a beginning of a second downlink subframe on the reference cell, wherein the first downlink subframe and the second downlink subframe refer to a same subframe number; determining, by the mobile terminal, a first target timing advance based on at least the measured 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 performing a handover of the mobile terminal to the target cell based on the measurement results and the first target timing advance. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A mobile terminal, comprising:
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a receiver, which, in operation, receives a first downlink subframe and a second downlink subframe; and processing circuitry, which, in operation; configures the mobile terminal with a time-aligned uplink reference cell; measures downlink reception time difference information between a beginning of the first downlink subframe on a target cell that is a non-time-aligned uplink target cell and a beginning of the second downlink subframe on the reference cell, wherein the first downlink subframe and the second downlink subframe refer to a same subframe number; determines a first target timing advance based on at least the measured 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 performs a handover of the mobile terminal to the target cell based on the measurement results and the first target timing advance. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification