RANDOM ACCESS CHANNEL RESOURCE ALLOCATION

• US 20120002617A1
• Filed: 11/12/2009
• Published: 01/05/2012
• Est. Priority Date: 02/02/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Vujcic, Dragan
• Granted Patent: US 8,964,659 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

The present invention provides a method of configuring random access resources for random access transmission, the method comprising: determining a number n of preamble signatures that can be used for random access transmission; grouping the n preamble signatures into K groups j (j=1, 2¦K) wherein K corresponds to a number of downlink component carriers and K is greater than or equal to 2; assigning each group j to a respective downlink component carrier; assigning configuration data to each group j; and transmitting the group j configuration data on the corresponding downlink component carrier.

Claims

1-16. -16. (canceled)

17. A method of configuration of random access resources for random access transmission, the method comprising:

determining a number n of preamble signatures that can be used for random access transmission;

grouping the n preamble signatures into K groups, each named group j, with j=1, 2 . . . K, wherein K corresponds to a number of downlink component carriers and K is greater than or equal to 2;

assigning each group j to a respective downlink component carrier;

assigning configuration data to each group j;

transmitting the group j configuration data on the corresponding downlink component carrier;

receiving an uplink component carrier including random access preamble with a specific preamble signature;

determining which downlink component carrier/group j the specific preamble signature corresponds to; and

transmitting a random access response on the determined downlink component carrier.

18. The method according to claim 17, wherein the step of transmitting the random access response is preceded by a step of allocating resources for uplink data transmission and downlink control transmission.

19. The method according to claim 18, wherein the step of allocating resources for uplink data transmission and downlink control transmission comprises allocating the determined component carrier for uplink data transmission and/or downlink control transmission.

20. The method according to claim 17, wherein the preamble signatures of the component carrier corresponding to group j, wherein j is greater than 1, are divided into a sub-group A and a sub-group B, wherein the number of preamble signatures of sub-group A corresponds to the total number of preamble signatures in the component carriers of the preceding groups 1 to j−

1.

21. The method according to claim 22, wherein at least one of a power threshold value and a message size threshold value for selecting sub-group A or sub-group B is set such that sub-group B is always selected by a UE.

22. The method according to claim 17, wherein the same time and/or frequency configuration is assigned to each downlink component carrier.

23. A method of random access transmission comprising:

detecting a synchronization signal transmitted on a downlink component carrier

receiving random access configuration data including a specific preamble signature group corresponding to the downlink component carrier, wherein a number n of preamble signatures that can be used for random access transmission are divided into K preamble signature groups, wherein K corresponds to a number of downlink component carriers and K is greater than or equal to 2;

selecting a preamble signature from the specific preamble signature group;

transmitting a preamble with the selected preamble signature on an uplink component carrier corresponding to the downlink component carrier;

receiving a random access response on the downlink component carrier, wherein the random access response includes configuration data indicating a component carrier for uplink data transmission and downlink control transmission;

transmitting data on the indicated component carrier for uplink data transmission; and

receiving control data on the indicated component carrier for downlink control transmission.

24. The method according to claim 23, wherein if the number of preamble signatures in the received set exceeds the number of preamble signatures in a sub-group A of the received set, a preamble from sub-group B of the received set is selected.

25. The method according to claim 24, a preamble signature of sub-group B is selected according to at least one of a power threshold value and a message size threshold value.

26. A user equipment for transmitting a random access preamble to a network entity, the user equipment comprising:

a detector for detecting a synchronization signal transmitted on a downlink component carrier;

a transceiver for receiving random access configuration data including a specific preamble signature group corresponding to the downlink component carrier, wherein a number n of preamble signatures that can be used for random access transmission are divided into K preamble signature groups, wherein K corresponds to a number of downlink component carriers and K is greater than or equal to 2; and

a processor for selecting a preamble signature from the specific preamble signature group;

the transceiver being operable to transmitting a preamble with the selected preamble signature on an uplink component carrier corresponding to the downlink component carrier, to receiving a random access response on the downlink component carrier, wherein the random access response includes configuration data indicating a component carrier for uplink data transmission and downlink control transmission, to transmitting data on the indicated component carrier for uplink data transmission, and to receiving control data on the indicated component carrier for downlink control transmission.

27. The user equipment according to claim 26, wherein if the number of preamble signatures in the received set exceeds the number of preamble signatures in a sub-group A of the received set, the processor is operable to select a preamble from sub-group B of the received set.

28. The user equipment according to claim 26, wherein the processor is operable to select, a preamble signature of sub-group B according to at least one of a power threshold value and a message size threshold value.

29. A network entity for configuring random access resources for random access transmission, the network entity comprising:

a transceiver for receiving a random access preamble and for transmitting random access configuration data on a downlink component carrier;

a processor operable to;

group n preamble signatures available for random access transmission into K groups, each named group j, with j=1, 2 . . . K, wherein K corresponds to a number of downlink component carriers and K is greater than or equal to 2;

assign each group j to a respective downlink component carrier;

assign configuration data to each group for transmission on the corresponding downlink component carrier;

control the transceiver for transmitting the group j configuration data on the corresponding downlink component carrier and for receiving an uplink component carrier including random access preamble with a specific preamble signature;

determine which downlink component carrier/group j the specific preamble signature corresponds to; and

control the transceiver for transmitting a random access response on the determined downlink component carrier.