Abstract
Methods and apparatus for random access in multicarrier wireless communications are disclosed. Methods and apparatus are provided for physical random access channel (PRACH) resource signaling, PRACH resource handling, preamble and PRACH resource selection, random access response (RAR) reception, preamble retransmission, and transmission and reception of subsequent messages. A method for maintaining an allowed multicarrier uplink (UL) random access channel (RACH) configuration set by adding an UL carrier to the allowed RACH configuration set provided that a triggering event occurs and performing a random access (RA) procedure using the allowed RACH configuration set. A method for sending data in multicarrier wireless communications by determining a set of available UL carriers and selecting an UL carrier from the set of available UL carriers.
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Declaration Date | Declaration Reference | Declaring Company | Specification Information | ||||||
4G | 16/09/2010 | ISLD-201010-010 | INTERDIGITAL INC |
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5G | 08/11/2019 | ISLD-201910-015 | INTERDIGITAL INC |
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Specification Information
Specification Information
Technologies
Family Information
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Publication No | Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | Status | National Phase Entries | |||||
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Technologies
Random access
Product
Use Cases
Services
Claim
1. An eNodeB comprising:
a processor; a transmitter operably coupled to the processor, the transmitter and processor configured to transmit downlink control information (DCI); and a receiver operably coupled to the processor, the receiver and processor configured to receive, from a wireless transmit receive unit (WTRU), a random access preamble on a secondary uplink component carrier selected from a plurality of component carriers; wherein the transmitter and processor are further configured to transmit a random access response (RAR), to the WTRU, always on a primary downlink component carrier in response to the random access preamble; and wherein the transmitter and processor are further configured to transmit downlink transmissions via the primary downlink component carrier and one or more secondary component carriers.
2. The eNodeB of claim 1, wherein a physical downlink control channel (PDCCH) order is transmitted in the DCI, wherein the DCI is DCI format 1a.
3. The eNodeB of claim 2, wherein the PDCCH order includes a carrier indicator field (CIF).
4. The eNodeB of claim 2, wherein the DCI format 1a includes a preamble index and the random access preamble is received from the WTRU in accordance with the preamble index.
5. The eNodeB of claim 4, wherein the transmitter and processor are further configured to transmit the preamble index with a value �000000� to cause a random selection of the preamble.
6. The eNodeB of claim 1, wherein the transmitter and processor are further configured to transmit random access channel configuration information for two or more component carriers.
7. The eNodeB of claim 1, wherein the DCI is transmitted via a first component carrier associated with a first cell and wherein the secondary uplink component carrier is associated with a second cell.
8. The eNodeB of claim 1, wherein the RAR includes a timing advance.
9. The eNodeB of claim 8, wherein the processor and receiver are further configured to receive an uplink transmission from the WTRU adjusted by the timing advance.
10. The eNodeB of claim 9, wherein the processor and receiver are further configured to receive a physical uplink shared channel (PUSCH) transmission from the WTRU adjusted by the timing advance.
11. A method performed by an eNodeB, the method comprising:
transmitting downlink control information (DCI); receiving, from a wireless transmit receive unit (WTRU), a random access preamble on a secondary uplink component carrier selected from a plurality of component carriers; transmitting a random access response (RAR), to the WTRU, always on a primary downlink component carrier in response to the random access preamble; and transmitting downlink transmissions via the primary downlink component carrier and one or more secondary component carriers.
12. The method of claim 11, wherein a physical downlink control channel (PDCCH) order is received in the DCI, wherein the DCI is DCI format 1a.
13. The method of claim 12, wherein the PDCCH order includes a carrier indicator field (CIF).
14. The method of claim 12, wherein the DCI format 1a includes a preamble index and the random access preamble is received from the WTRU in accordance with the preamble index.
15. The method of claim 14, further comprising transmitting the preamble index with a value �000000� to cause a random selection of the preamble.
16. The method of claim 11, further comprising transmitting random access channel configuration information for two or more component carriers.
17. The method of claim 11, wherein the transmitting the DCI includes transmitting the DCI via a first component carrier associated with a first cell, and wherein the secondary uplink component carrier is associated with a second cell.
18. The method of claim 11, wherein the RAR includes a timing advance.
19. The method of claim 18, further comprising receiving an uplink transmission from the WTRU adjusted by the timing advance.
20. The method of claim 19, wherein the receiving the uplink transmission includes receiving a physical uplink shared channel (PUSCH) transmission from the WTRU adjusted by the timing advance.
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.