Title:
USER EQUIPMENT, COMMUNICATION SYSTEM, AND BACKOFF CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/2015/002123
Kind Code:
A1
Abstract:
This user equipment, which is capable of wireless device-to-device communication, is provided with the following: a resource-state detection unit that detects the state of each resource in a set of resources that can be used for device-to-device communication; a backoff control unit that, if the states detected by the resource-state detection unit satisfy a predetermined condition, puts the user equipment in a backoff state in which said user equipment does not transmit a discovery signal for a prescribed length of time; and a discovery-signal transmission unit that, if the user equipment is not in the aforementioned backup state, selects a resource from the abovementioned set of resources and uses the selected resource to transmit a discovery signal.
Inventors:
NAGATA SATOSHI (JP)
KUSUME KATSUTOSHI (DE)
TAOKA HIDEKAZU (DE)
HU LIANG (DE)
KUSUME KATSUTOSHI (DE)
TAOKA HIDEKAZU (DE)
HU LIANG (DE)
Application Number:
PCT/JP2014/067322
Publication Date:
January 08, 2015
Filing Date:
June 30, 2014
Export Citation:
Assignee:
NTT DOCOMO INC (JP)
International Classes:
H04W92/18; H04W8/00; H04W72/08
Domestic Patent References:
| WO2009147709A1 | 2009-12-10 |
Foreign References:
| JP2012507975A | 2012-03-29 | |||
| JPH1155266A | 1999-02-26 | |||
| JP2003249935A | 2003-09-05 | |||
| JP2012209893A | 2012-10-25 |
Other References:
INTEL CORPORATION: "Discussion on design options for D2D communication", 3GPP TSG RAN WG1 MEETING #73 RL-131925, 24 May 2013 (2013-05-24), XP050697711
PANASONIC: "Potential control mechanisms for D2D communication", 3GPP TSG-RAN WG1#73 R1- 132144, 24 May 2013 (2013-05-24), XP050697920, Retrieved from the Internet
See also references of EP 3018974A4
PANASONIC: "Potential control mechanisms for D2D communication", 3GPP TSG-RAN WG1#73 R1- 132144, 24 May 2013 (2013-05-24), XP050697920, Retrieved from the Internet
See also references of EP 3018974A4
Attorney, Agent or Firm:
ITOH, Tadashige et al. (JP)
Tadashige Ito (JP)
Tadashige Ito (JP)
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