Abstract
A method and apparatus for supporting a random access using a random access channel (RACH) are disclosed. The WTRU detects a format of control information in at least one control channel element (CCE) of a common area in a control portion of a downlink transmission. The control information indicates a resource allocation in a data portion of the downlink transmission. The WTRU recovers a random access response assigned to the WTRU from the indicated resource allocation of the data portion on a condition that the at least one CCE has a random access radio network terminal identifier (RA-RNTI) assigned to the WTRU.
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3G | 13/09/2009 | ISLD-200910-006 | INTERDIGITAL INC | No | Family Member | ||||
4G | 13/09/2009 | ISLD-200910-006 | INTERDIGITAL INC |
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4G | 30/10/2019 | ISLD-201909-015 | INTERDIGITAL INC |
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5G | 07/11/2019 | ISLD-201910-015 | INTERDIGITAL INC |
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Specification Information
Specification Information
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CN103747533B | 5G | 07/11/2019 | ISLD-201910-015 | INTERDIGITAL INC |
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Technologies
Random access
Product
User Equipment (UE/Terminal)
Use Cases
Services
Claim
1. A wireless transmit/receive unit (WTRU) comprising:
a transmitter configured to transmit a random access preamble;
a receiver configured to receive a downlink transmission, wherein the downlink transmission comprises a physical downlink control channel (PDCCH), the PDCCH comprises a plurality of control channel elements (CCEs), and a subset of the plurality of CCEs corresponds to a common portion of the PDCCH, wherein the common portion of the PDCCH is intended for a plurality of WTRUs and is not addressed to a WTRU-specific identity for the WTRU; and
a processor, operatively coupled to the transmitter and the receiver, configured to:
perform decoding within the subset of the plurality of CCEs to detect downlink control information intended for the WTRU, wherein the downlink control information comprises a resource allocation to be used to process a random access channel (RACH) response in a physical downlink shared channel (PDSCH) included in the downlink transmission; and
process the RACH response in the PDSCH in accordance with the downlink control information.
2. The WTRU of claim 1, wherein the processor is configured to perform the decoding to the subset of the plurality of CCEs corresponding to the common portion of the PDCCH.
3. The WTRU of claim 1, wherein the subset of the plurality of CCEs comprises transport format information.
4. The WTRU of claim 1, wherein the processor is configured to decode the RACH response using information relating to a modulation and coding scheme (MCS) included in the subset of the plurality of CCEs.
5. The WTRU of claim 1, wherein the subset of the plurality of CCEs is spread in a time-frequency domain.
6. The WTRU of claim 1, wherein the processor is configured to determine a random access radio network temporary identifier (RA-RNTI), and to unmask a masked cyclic redundancy check (CRC) using the determined RA-RNTI.
7. The WTRU of claim 6, wherein the RA-RNTI is utilized by the plurality of WTRUs.
8. A method performed by a wireless transmit/receive unit (WTRU), the method comprising:
transmitting a random access preamble;
receiving a downlink transmission, wherein the downlink transmission comprises a physical downlink control channel (PDCCH), the PDCCH comprises a plurality of control channel elements (CCEs), and a subset of the plurality of CCEs corresponds to a common portion of the PDCCH, wherein the common portion of the PDCCH is intended for a plurality of WTRUs and is not addressed to a WTRU-specific identity for the WTRU;
performing decoding within the subset of the plurality of CCEs to detect downlink control information intended for the WTRU, wherein the downlink control information comprises a resource allocation to be used to process a random access channel (RACH) response in a physical downlink shared channel (PDSCH) included in the downlink transmission; and
processing the RACH response in the PDSCH in accordance with the downlink control information.
9. The method of claim 8, wherein the performing of decoding comprises performing decoding to the subset of the plurality of CCEs corresponding to the common portion of the PDCCH.
10. The method of claim 8, wherein the subset of the plurality of CCEs comprises transport format information.
11. The method of claim 8, wherein the processing of the RACH response comprises decoding the RACH response using information relating to a modulation and coding scheme (MCS) included in the subset of the plurality of CCEs.
12. The method of claim 8, wherein the subset of the plurality of CCEs is spread in a time-frequency domain.
13. The method of claim 8, further comprising determining a random access radio network temporary identifier (RA-RNTI), and unmasking a masked cyclic redundancy check (CRC) using the determined RA-RNTI.
14. The method of claim 13, wherein the RA-RNTI is utilized by the plurality of WTRUs.
15. The method of claim 8, wherein a starting CCE of the subset of the plurality of CCEs of the PDCCH corresponds to a first CCE in the PDCCH.
16. The method of claim 8, wherein the subset of the plurality of CCEs of the PDCCH corresponds to a number of consecutive CCEs in the PDCCH.
17. The method of claim 8, wherein the subset of the plurality of CCEs of the PDCCH comprises downlink control information that comprises a RACH response intended for at least one other WTRU.
18. The WTRU of claim 1, wherein a starting CCE of the subset of the plurality of CCEs of the PDCCH corresponds to a first CCE in the PDCCH.
19. The WTRU of claim 1, wherein the subset of the plurality of CCEs of the PDCCH corresponds to a number of consecutive CCEs in the PDCCH.
20. The WTRU of claim 1, wherein the subset of the plurality of CCEs of the PDCCH comprises downlink control information that comprises a RACH response intended for at least one other WTRU.
Associated Portfolios
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The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
The information in grey was provided by the patent holder
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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.