Random access process in a multicarrier base station and wireless device
First Claim
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1. A method comprising:
- a) receiving, by a base station from a wireless device, a buffer status report on a first cell in a plurality of cells, said buffer status report indicating an amount of data available for transmission in at least one uplink buffer of said wireless device, said first cell being assigned by said base station to a primary cell group;
b) transmitting, by said base station to said wireless device, a control command for transmission of a random access preamble by said wireless device on a secondary cell in said plurality of cells if said base station determines;
i) based on said buffer status report, that radio resources of said secondary cell are required for transmission of a portion of said data in addition to radio resources on said primary cell group; and
ii) that said secondary cell requires a first uplink timing that is different from a second uplink timing of said primary cell group;
c) receiving, by said base station from said wireless device, said random access preamble on said secondary cell, said secondary cell being assigned to a secondary cell group, wherein transmission timing of said random access preamble is determined based, at least in part, on a first synchronization signal transmitted by said base station on said secondary cell group;
d) transmitting, by said base station to said wireless device, a random access response on a primary cell of said primary cell group, said random access response comprising a timing advance command for said secondary cell group; and
e) transmitting, by said base station to said wireless device, at least one control packet comprising transport format information and resource allocation information for transmission of a plurality of packets of said data on said secondary cell.
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Abstract
A Base station transmits a control command for transmission of a random access preamble on a first cell if the base station determines radio resources of the first cell are required for transmission of a portion of data and that the first cell requires a different uplink timing from all currently activated cells of the wireless device. The base station transmits at least one control packet for providing transport format information and resource allocation information for transmission of a plurality of packets of the data to be transmitted on a first data channel of the first cell.
126 Citations
18 Claims
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1. A method comprising:
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a) receiving, by a base station from a wireless device, a buffer status report on a first cell in a plurality of cells, said buffer status report indicating an amount of data available for transmission in at least one uplink buffer of said wireless device, said first cell being assigned by said base station to a primary cell group; b) transmitting, by said base station to said wireless device, a control command for transmission of a random access preamble by said wireless device on a secondary cell in said plurality of cells if said base station determines; i) based on said buffer status report, that radio resources of said secondary cell are required for transmission of a portion of said data in addition to radio resources on said primary cell group; and ii) that said secondary cell requires a first uplink timing that is different from a second uplink timing of said primary cell group; c) receiving, by said base station from said wireless device, said random access preamble on said secondary cell, said secondary cell being assigned to a secondary cell group, wherein transmission timing of said random access preamble is determined based, at least in part, on a first synchronization signal transmitted by said base station on said secondary cell group; d) transmitting, by said base station to said wireless device, a random access response on a primary cell of said primary cell group, said random access response comprising a timing advance command for said secondary cell group; and e) transmitting, by said base station to said wireless device, at least one control packet comprising transport format information and resource allocation information for transmission of a plurality of packets of said data on said secondary cell. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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a) transmitting, by a base station to a wireless device, at least one control message on a first cell in a plurality of cells, said at least one control message establishing at least one radio bearer, said at least one radio bearer enabling uplink data transmission with a guaranteed bit rate from said wireless device, said first cell being assigned by said base station to a primary cell group; b) transmitting, by said base station to said wireless device, a control command for transmission of a random access preamble by said wireless device on a secondary cell in said plurality of cells if said base station determines; i) based on said guaranteed bit rate, that radio resources of said secondary cell are required for transmission of a portion of said uplink data in addition to radio resources on said primary cell group; and ii) that said secondary cell requires a first uplink timing that is different from a second uplink timing of said primary cell group; c) receiving, by said base station from said wireless device, said random access preamble on said secondary cell, said secondary cell being assigned to a secondary cell group, wherein transmission timing of said random access preamble is determined based, at least in part, on a first synchronization signal transmitted by said base station on said secondary cell group; d) transmitting, by said base station to said wireless device, a random access response, said random access response comprising a first timing advance command for said secondary cell group; and e) transmitting, by said base station to said wireless device, at least one control packet comprising transport format information and resource allocation information for transmission of a plurality of packets of said uplink data on said secondary cell. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A base station comprising:
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a) one or more processors; and b) memory storing instructions that, when executed, cause said base station to; i) receive a buffer status report indicating an amount of data available for transmission in at least one uplink buffer of a wireless device; ii) transmit, to said wireless device, a control command for transmission of a random access preamble on a secondary cell in a plurality of cells if said base station determines; (1) based on said buffer status report, that radio resources of said secondary cell are required for transmission of a portion of said data in addition to radio resources on said primary cell group; and (2) that said secondary cell requires a different uplink timing from currently activated and synchronized cells of said wireless device; iii) receive, from said wireless device, said random access preamble on said secondary cell, said secondary cell being assigned to a secondary cell group in a plurality of cell groups, wherein transmission timing of said random access preamble is determined based, at least in part, on a first synchronization signal transmitted by said base station on said secondary cell group; iv) transmit, to said wireless device, a random access response, said random access response comprising a timing advance command for said secondary cell group; and v) transmit at least one control packet comprising transport format information and resource allocation information for transmission of a plurality of packets of said data on said secondary cell. - View Dependent Claims (15, 16, 17, 18)
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Specification