Time alignment in multicarrier systems
First Claim
Patent Images
1. A method comprising:
- a) receiving, by a wireless device, at least one radio resource control message from a base station, said at least one radio resource control message;
i) a causing configuration of a plurality of carriers comprising a first carrier and at least one second carrier; and
ii) comprising;
(1) a carrier group index for a second carrier in said at least one second carrier, said carrier group index identifying a second carrier group, said second carrier group being one of a plurality of carrier groups, said second carrier group comprising a second subset of said at least one second carrier;
(2) a plurality of second uplink carrier parameters of a second uplink carrier for said second carrier; and
(3) a plurality of random access resource parameters identifying random access resources for said second carrier;
b) receiving, by said wireless device, a media access control activation command for at least activating said second carrier in said second carrier group;
c) receiving, by said wireless device from said base station, a control command causing said wireless device to transmit a random access preamble on said second uplink carrier, said control command comprising a preamble index corresponding to said random access preamble;
d) transmitting, by said wireless device, said random access preamble on said random access resources on said second uplink carrier, transmission timing of said random access preamble being determined, at least in part, employing a second synchronization signal transmitted on one of at least one downlink carrier in said second carrier group, uplink transmissions in said second carrier group employing said second synchronization signal as timing reference;
e) receiving, by said wireless device, at least one time alignment command from said base station, said time alignment command comprising;
i) a time adjustment value; and
ii) an index identifying said second carrier group; and
f) applying, by said wireless device, said time adjustment value to uplink signals transmitted on all activated uplink carriers in said second carrier group such that said base station receives substantially aligned uplink signals in frames and subframes of said second carrier group.
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Abstract
Transmission timing of a random access preamble in an uplink carrier of a carrier group being determined employing a synchronization signal transmitted on a downlink carrier of the carrier group. The wireless device receives a time alignment command from the base station. The time alignment command comprises a time adjustment value and an index identifying the carrier group. The wireless device apply the time adjustment value to uplink signals transmitted on all activated uplink carriers in the carrier group.
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Citations
20 Claims
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1. A method comprising:
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a) receiving, by a wireless device, at least one radio resource control message from a base station, said at least one radio resource control message; i) a causing configuration of a plurality of carriers comprising a first carrier and at least one second carrier; and ii) comprising; (1) a carrier group index for a second carrier in said at least one second carrier, said carrier group index identifying a second carrier group, said second carrier group being one of a plurality of carrier groups, said second carrier group comprising a second subset of said at least one second carrier; (2) a plurality of second uplink carrier parameters of a second uplink carrier for said second carrier; and (3) a plurality of random access resource parameters identifying random access resources for said second carrier; b) receiving, by said wireless device, a media access control activation command for at least activating said second carrier in said second carrier group; c) receiving, by said wireless device from said base station, a control command causing said wireless device to transmit a random access preamble on said second uplink carrier, said control command comprising a preamble index corresponding to said random access preamble; d) transmitting, by said wireless device, said random access preamble on said random access resources on said second uplink carrier, transmission timing of said random access preamble being determined, at least in part, employing a second synchronization signal transmitted on one of at least one downlink carrier in said second carrier group, uplink transmissions in said second carrier group employing said second synchronization signal as timing reference; e) receiving, by said wireless device, at least one time alignment command from said base station, said time alignment command comprising; i) a time adjustment value; and ii) an index identifying said second carrier group; and f) applying, by said wireless device, said time adjustment value to uplink signals transmitted on all activated uplink carriers in said second carrier group such that said base station receives substantially aligned uplink signals in frames and subframes of said second carrier group. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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a) transmitting, by a base station, at least one radio resource control message to a wireless device, said at least one radio resource control message; i) configured to cause configuration of a plurality of carriers comprising a first carrier and at least one second carrier in said wireless device; and ii) comprising; (1) a carrier group index for a second carrier in said at least one second carrier, said carrier group index identifying a second carrier group, said second carrier group being one of a plurality of carrier groups, said second carrier group comprising a second subset of said at least one second carrier; (2) a plurality of second uplink carrier parameters of a second uplink carrier for said second carrier; and (3) a plurality of random access resource parameters identifying random access resources for said second carrier; b) transmitting, by said base station, a media access control activation command for at least activating said second carrier in said second carrier group in said wireless device; c) transmitting, by said base station to said wireless device, a control command configured to cause said wireless device to transmit a random access preamble on a second uplink carrier, said control command comprising a preamble index corresponding to said random access preamble; d) receiving, by said base station from said wireless device, said random access preamble on said random access resources on said second uplink carrier, transmission timing of said random access preamble being determined, at least in part, employing a second synchronization signal transmitted on one of at least one downlink carrier in said second carrier group, uplink transmissions in said second carrier group employing said synchronization signal as timing reference; e) transmitting, by said base station, at least one time alignment command to said wireless device, said time alignment command comprising; i) a time adjustment value; and ii) an index identifying said second carrier group; and wherein said at least one time alignment command causes substantial alignment of reception timing of uplink signals in frames and subframes of said second carrier group. - View Dependent Claims (13)
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14. A wireless device comprising:
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a) one or more communication interfaces configured to communicate with a base station via at least one wireless link; b) one or more processors; and c) memory storing instructions that, when executed by said one or more processors, cause said wireless device to; i) receive at least one radio resource control message from said base station, said at least one radio resource control message; (1) causing configuration of a plurality of carriers comprising a first carrier and at least one second carrier; and (2) comprising a carrier group index for a second carrier in said at least one second carrier, said carrier group index identifying a second carrier group, said second carrier group being one of a plurality of carrier groups, said second carrier group comprising a second subset of said at least one second carrier; ii) receive, from said base station, a control command causing said wireless device to transmit a random access preamble on a second uplink carrier of said second carrier; iii) transmit said random access preamble on said second uplink carrier, transmission timing of said random access preamble being determined, at least in part, employing a second synchronization signal transmitted on one of at least one downlink carrier in said second carrier group, uplink transmissions in said second carrier group employing said second synchronization signal as timing reference; iv) receive at least one time alignment command from said base station, said time alignment command comprising; (1) a time adjustment value; and (2) an index identifying said second carrier group; and v) apply said time adjustment value to uplink signals transmitted on all activated uplink carriers in said second carrier group. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification