Title:
USER TERMINAL, WIRELESS BASE STATION, WIRELESS COMMUNICATION METHOD, AND WIRELESS COMMUNICATION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2015/115283
Kind Code:
A1
Abstract:
A decrease in overall system throughput is suppressed when determining transmission/reception timing for a D2D discovery signal on the basis of a predetermined downlink signal from a wireless base station. A user terminal (20) according to an embodiment of the present invention is capable of transmitting an inter-terminal discovery signal to a user terminal under coverage of a cell different from a currently located cell, and includes: a reception unit (203) that receives a signal that is transmitted from a wireless base station (10) forming the currently located cell and that includes resource allocation information for the inter-terminal discovery signal, and a predetermined downlink signal used for synchronizing the transmission/reception timing for the inter-terminal discovery signal; and a control unit (401) that controls the transmission/reception timing for the inter-terminal discovery signal on the basis of the reception timing of the resource allocation information and the predetermined downlink signal. The user terminal is characterized in that the control unit maps a resource for transmitting the inter-terminal discovery signal in a time-division multiplexed manner with respect to a plurality of cells with different cell radii.
Inventors:
HARADA HIROKI (JP)
ZHAO QUN (CN)
ZENG YONGBO (CN)
ZHANG YONGSHENG (CN)
ZHAO QUN (CN)
ZENG YONGBO (CN)
ZHANG YONGSHENG (CN)
Application Number:
PCT/JP2015/051599
Publication Date:
August 06, 2015
Filing Date:
January 22, 2015
Export Citation:
Assignee:
NTT DOCOMO INC (JP)
International Classes:
H04W8/00; H04W56/00; H04W72/04; H04W84/10; H04W92/18
Foreign References:
| JP2012244422A | 2012-12-10 | |||
| JP2014015823A | 2014-01-30 |
Other References:
ETRI: "Discussion on resource allocation for D2D discovery", 3GPP TSG RAN WG1 MEETING #75 R1- 135279, XP050734973
ETRI: "Discussion on Inter- Cell D2D Discover", 3GPP TSG-RAN WG2 #84 R2-134149, XP050736922
ZTE: "Discussion of D2D Discovery", 3GPP TSG-RAN WG1 #74 RL-133149, pages 1 - 7, XP050713280
NTT DOCOMO, INC.: "Discussion on synchronization of D2D discovery", 3GPP TSG RAN WG1 MEETING #74BIS RL-134502, 28 September 2013 (2013-09-28), XP050717604
ALCATEL -LUCENT SHANGHAI BELL ET AL.: "D2D timing", 3GPP TSG RAN WG1 MEETING #74 R1- 132994, 10 August 2013 (2013-08-10), XP050716224
See also references of EP 3101927A4
"Evolved Universal Terrestrial Radio Access (E-UTRA); Further advancements for E-UTRA physical layer aspects", 3GPP TR 36.814
KEY DRIVERS FOR LTE SUCCESS: SERVICES EVOLUTION, September 2011 (2011-09-01), Retrieved from the Internet
ETRI: "Discussion on Inter- Cell D2D Discover", 3GPP TSG-RAN WG2 #84 R2-134149, XP050736922
ZTE: "Discussion of D2D Discovery", 3GPP TSG-RAN WG1 #74 RL-133149, pages 1 - 7, XP050713280
NTT DOCOMO, INC.: "Discussion on synchronization of D2D discovery", 3GPP TSG RAN WG1 MEETING #74BIS RL-134502, 28 September 2013 (2013-09-28), XP050717604
ALCATEL -LUCENT SHANGHAI BELL ET AL.: "D2D timing", 3GPP TSG RAN WG1 MEETING #74 R1- 132994, 10 August 2013 (2013-08-10), XP050716224
See also references of EP 3101927A4
"Evolved Universal Terrestrial Radio Access (E-UTRA); Further advancements for E-UTRA physical layer aspects", 3GPP TR 36.814
KEY DRIVERS FOR LTE SUCCESS: SERVICES EVOLUTION, September 2011 (2011-09-01), Retrieved from the Internet
Attorney, Agent or Firm:
AOKI, Hiroyoshi et al. (JP)
Hiroyoshi Aoki (JP)
Hiroyoshi Aoki (JP)
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