Timing synchronization for downlink (DL) transmissions in coordinated multipoint (CoMP) systems
First Claim
1. A method for adjusting a receiver timing of a wireless device in a Coordinated MultiPoint (CoMP) system, comprising:
- receiving a plurality of node specific reference signals (RSs) at a wireless device from a plurality of cooperating nodes in a coordination set of the CoMP system, wherein the coordination set includes at least two cooperating nodes; and
estimating a composite received RS timing from a plurality of received RS timings generated from the plurality of node specific RSs, wherein the received RS timings represent timings from the at least two cooperating nodes;
adjusting the receiver timing based at least in part on the composite received RS timing; and
selecting an earliest received RS timing of the composite received RS timing, wherein the composite received RS timing is represented by
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Accused Products
Abstract
Technology for adjusting a receiver timing of a wireless device in a Coordinated MultiPoint (CoMP) system is disclosed. One method can include the wireless device receiving a plurality of node specific reference signals (RSs) from a plurality of cooperating nodes in a coordination set of the CoMP system. The coordination set includes at least two cooperating nodes. The wireless device can estimate a composite received RS timing from a plurality of received RS timings generated from the plurality of node specific RSs. The received RS timings represent timings from the at least two cooperating nodes. The wireless device can adjust the receiver timing based on the composite received RS timing. A node specific RS can include a channel-state information reference signal (CSI-RS).
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Citations
22 Claims
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1. A method for adjusting a receiver timing of a wireless device in a Coordinated MultiPoint (CoMP) system, comprising:
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receiving a plurality of node specific reference signals (RSs) at a wireless device from a plurality of cooperating nodes in a coordination set of the CoMP system, wherein the coordination set includes at least two cooperating nodes; and estimating a composite received RS timing from a plurality of received RS timings generated from the plurality of node specific RSs, wherein the received RS timings represent timings from the at least two cooperating nodes; adjusting the receiver timing based at least in part on the composite received RS timing; and selecting an earliest received RS timing of the composite received RS timing, wherein the composite received RS timing is represented by - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A timing estimation device for estimating a receiver timing of a wireless device in a Coordinated MultiPoint (CoMP) system, comprising:
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a downlink receiving module configured to receive a plurality of node specific reference signals (RSs) at a wireless device from a plurality of cooperating nodes in a coordination set of the CoMP system, wherein the coordination set includes at least two cooperating nodes; a timing estimator configured to estimate a composite received RS timing from a plurality of received RS timings generated from the plurality of node specific RSs and select an earliest received RS timing for the composite received RS timing and the composite received RS timing is represented by - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for synchronizing a timing of a downlink (DL) transmission of a first cooperating node relative to a downlink transmission of a second cooperating node in a Coordinated MultiPoint (CoMP) system, comprising:
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receiving at the first cooperating node from a wireless device a timing feedback, wherein timing feedback includes at least one received reference signal (RS) timing generated from a node specific RS of at least one cooperating node, wherein prior to receiving the timing feedback; selecting, at the first cooperating node, a second cooperating node from a plurality of cooperating nodes, wherein a node specific RS from the second cooperating node is used by the wireless device to generate a synchronization RS timing, and the synchronization RS timing is used for timing synchronization for received data or a received physical downlink shared channel (PDSCH), transmitting a selection of the selected cooperating nodes to the wireless device, wherein the synchronization RS timing is used to adjust a receiver timing of the wireless device for received data or the received PDSCH; modifying a downlink transmission timing at the first cooperating node by an adjustment timing using the timing feedback; and transmitting a node specific RS from the first cooperating node to the wireless device. - View Dependent Claims (17, 18, 19)
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20. A timing synchronization device for synchronizing a timing of a downlink (DL) transmission of a first cooperating node relative to a downlink transmission of a second cooperating node in a Coordinated MultiPoint (CoMP) system, comprising:
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a uplink receiving module configured to receive from a wireless device a timing feedback, wherein timing feedback includes at least one received reference signal (RS) timing generated from a node specific RS of at least one cooperating node; a timing modification module configured to modify a downlink transmission timing by an adjustment timing using the timing feedback; a downlink transmitting module configured to transmit a node specific RS to the wireless device to adjust a receiver device timing based at least in part on the node specific RS for received data or a received physical downlink shared channel (PDSCH); and transmitting a node specific RS from the at least one cooperating node to a wireless device. - View Dependent Claims (21, 22)
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Specification