Title:
RADIO TERMINAL, RADIO ACCESS NETWORK NODE, AND METHOD FOR THESE
Document Type and Number:
WIPO Patent Application WO/2020/084878
Kind Code:
A1
Abstract:
A radio terminal (2) transmits a first message of a two-step random access procedure, and then attempts to receive a second message of the two-step random access procedure. In response to the reception of the second message of the two-step random access procedure having succeeded and the second message having been determined to explicitly or implicitly indicate a fallback to a four-step random access procedure, the radio terminal (2) further attempts to receive a control message that includes an uplink grant indicating an uplink resource that can be used for the transmission of a third message of the four-step random access procedure. Thus, it is possible, for example, to contribute to lightening the load on a radio terminal that supports a fallback from a two-step random access procedure to a four-step random access procedure.
Inventors:
FUTAKI HISASHI (JP)
Application Number:
PCT/JP2019/032470
Publication Date:
April 30, 2020
Filing Date:
August 20, 2019
Export Citation:
Assignee:
NEC CORP (JP)
International Classes:
H04W74/08
Foreign References:
| JP2018202276A | 2018-12-27 |
Other References:
LG ELECTRONICS INC: "2-Step CBRA procedure for NR-U", 3GPP DRAFT; R2-1815157 2-STEP CBRA PROCEDURE FOR NR-U, vol. RAN WG2, 28 September 2018 (2018-09-28), Chengdu, China, pages 1 - 3, XP051524523
INTERDIGITAL: "2-Step RACH Procedure", 3GPP DRAFT; R2-1814008 (R15 NRU SI AI 11211 2-STEP RACH), vol. RAN WG2, 27 September 2018 (2018-09-27), Chengdu, China, pages 1 - 5, XP051523471
"3GPP R2-1812342, 3GPP TSG-RAN WG2 Meeting #103", 20 August 2018, MEDIATEK INC., article "2-step CBRA procedure"
"R2-1812832, 3GPP TSG-RAN WG2 Meeting #103", 20 August 2018, LG ELECTRONICS INC., article "Considerations on 2-Step CBRA procedure for NR-U SA"
"3GPP R2-1811664, 3GPP TSG-RAN WG2 Meeting #103", 20 August 2018, INTEL CORPORATION, article "Considerations of 2-step CBRA for NR licensed and unlicensed operation"
3GPP TS 22.368, 13 January 2017 (2017-01-13)
See also references of EP 3873161A4
INTERDIGITAL: "2-Step RACH Procedure", 3GPP DRAFT; R2-1814008 (R15 NRU SI AI 11211 2-STEP RACH), vol. RAN WG2, 27 September 2018 (2018-09-27), Chengdu, China, pages 1 - 5, XP051523471
"3GPP R2-1812342, 3GPP TSG-RAN WG2 Meeting #103", 20 August 2018, MEDIATEK INC., article "2-step CBRA procedure"
"R2-1812832, 3GPP TSG-RAN WG2 Meeting #103", 20 August 2018, LG ELECTRONICS INC., article "Considerations on 2-Step CBRA procedure for NR-U SA"
"3GPP R2-1811664, 3GPP TSG-RAN WG2 Meeting #103", 20 August 2018, INTEL CORPORATION, article "Considerations of 2-step CBRA for NR licensed and unlicensed operation"
3GPP TS 22.368, 13 January 2017 (2017-01-13)
See also references of EP 3873161A4
Attorney, Agent or Firm:
IEIRI Takeshi (JP)
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