Title:
RACH COMBINING ACROSS MULTIPLE ATTEMPTS
Document Type and Number:
WIPO Patent Application WO/2017/209935
Kind Code:
A3
Abstract:
A mechanism is proposed to reduce overhead at the expense of increasing latency for UEs with weak link gain, while the latency for most UEs may remain the same. In one aspect of this disclosure, a UE may determine the number of attempts for transmitting a RACH signal based on one or more of path loss, the transmit power of the UE, the beam correspondence at the UE, or the power of signals received during the synchronization subframe. The UE may transmit the RACH signal in the determined number of attempts. In another aspect of the disclosure, a base station may combine signals of one or more RACH attempts to decode a RACH signal. The base station may inform a UE regarding the number of RACH subframes that the base station uses for decoding the RACH signal through a random access response message.
Inventors:
ISLAM MUHAMMAD NAZMUL (US)
LI JUNYI (US)
SUBRAMANIAN SUNDAR (US)
CEZANNE JUERGEN (US)
ABEDINI NAVID (US)
LUO TAO (US)
LI JUNYI (US)
SUBRAMANIAN SUNDAR (US)
CEZANNE JUERGEN (US)
ABEDINI NAVID (US)
LUO TAO (US)
Application Number:
PCT/US2017/032725
Publication Date:
February 08, 2018
Filing Date:
May 15, 2017
Export Citation:
Assignee:
QUALCOMM INC (US)
International Classes:
H04W74/08; H04B7/08; H04W72/04
Foreign References:
| US20160119038A1 | 2016-04-28 | |||
| US20150359005A1 | 2015-12-10 |
Other References:
JEONG CHEOL ET AL: "Random access in millimeter-wave beamforming cellular networks: issues and approaches", IEEE COMMUNICATIONS MAGAZINE, IEEE SERVICE CENTER, PISCATAWAY, US, vol. 53, no. 1, 1 January 2015 (2015-01-01), pages 180 - 185, XP011570628, ISSN: 0163-6804, [retrieved on 20150114], DOI: 10.1109/MCOM.2015.7010532
LG ELECTRONICS INC: "RACH Soft Combining", 3GPP DRAFT; R1- 074979, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Korea; 20071104, 4 November 2007 (2007-11-04), XP050108021
FUJITSU: "The impacts on RAR caused by preamble repetition", vol. RAN WG1, no. Belgrade, Serbia; 20150420 - 20150424, 10 April 2015 (2015-04-10), XP050949521, Retrieved from the Internet
QUALCOMM INCORPORATED: "4-step RACH procedure consideration", vol. RAN WG1, no. Spokane, USA; 20170116 - 20170120, 10 January 2017 (2017-01-10), XP051203106, Retrieved from the Internet
LG ELECTRONICS INC: "RACH Soft Combining", 3GPP DRAFT; R1- 074979, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Korea; 20071104, 4 November 2007 (2007-11-04), XP050108021
FUJITSU: "The impacts on RAR caused by preamble repetition", vol. RAN WG1, no. Belgrade, Serbia; 20150420 - 20150424, 10 April 2015 (2015-04-10), XP050949521, Retrieved from the Internet
QUALCOMM INCORPORATED: "4-step RACH procedure consideration", vol. RAN WG1, no. Spokane, USA; 20170116 - 20170120, 10 January 2017 (2017-01-10), XP051203106, Retrieved from the Internet
Attorney, Agent or Firm:
HODGES, Jonas J. et al. (US)
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