Terminal, base station, method of generating dmrs, and transmission method

Patent metadata

Field	Value
Publication number	US-2016112994-A1
Application number	US-201314777702-A
Country	US
Kind code	A1
Filing date	Apr 1, 2013
Priority date	Apr 1, 2013
Publication date	Apr 21, 2016
Grant date	—

Abstract

The present invention aims at allowing a demodulation reference signal (DMRS) pattern suitable for a terminal to be selected from among a plurality of DMRS patterns including Legacy DMRS and Reduced DMRS. Disclosed is a terminal including: reception section ( 21 ) that receives uplink control information; control section ( 23 ) that determines a specific mapping pattern from among a plurality of mapping patterns for an uplink DMRS on the basis of the control information; and DMRS generating section ( 24 ) that generates a DMRS according to the specific mapping pattern.

First claim

1 . A terminal comprising:
a reception section that receives uplink control information; a control section that determines a specific mapping pattern based on the control information from among a plurality of mapping patterns for an uplink demodulation reference signal (DMRS); and a generation section that generates a DMRS according to the specific mapping pattern.

2 . The terminal according to claim 1 , wherein the control information includes information indicating the specific mapping pattern.

3 . The terminal according to claim 2 , wherein the information indicating the specific mapping pattern indicates the specific mapping pattern and a virtual cell ID.

4 . The terminal according to claim 1 , wherein:
the plurality of mapping patterns are associated respectively with values of uplink allocation information included in the control information; and the control section determines a mapping pattern corresponding to the received assignment information as the specific mapping pattern.

5 . The terminal according to claim 4 , wherein:
the plurality of mapping patterns include a first mapping pattern and a second mapping pattern that includes a smaller amount of resource to which a DMRS is mapped than the first mapping pattern; the allocation information indicating an odd number of allocation resource blocks is associated with the first mapping pattern; and the allocation information indicating an even number of allocation resource blocks is associated with the second mapping pattern.

6 . The terminal according to claim 4 , wherein:
the plurality of mapping patterns include a first mapping pattern and a second mapping pattern that includes a smaller amount of resource to which a DMRS is mapped than the first mapping pattern; the allocation information indicating an odd number of allocation resource blocks is associated with the number of allocation resource blocks equal to the odd number plus or minus one and the second mapping pattern; and the allocation information indicating an even number of resource blocks is associated with allocation of the even number of resource blocks and the first mapping pattern.

7 . The terminal according to claim 4 , wherein:
the plurality of mapping patterns include a first mapping pattern and a second mapping pattern that includes a smaller amount of resource to which a DMRS is mapped than the first mapping pattern; the allocation information indicating an allocation bandwidth equal to or less than a predetermined value is associated with the first mapping pattern; and the allocation information indicating an allocation bandwidth greater than the predetermined value is associated with the second mapping pattern.

8 . The terminal according to claim 4 , wherein:
the plurality of mapping patterns include a first mapping pattern and a second mapping pattern that includes a smaller amount of resource to which a DMRS is mapped than the first mapping pattern; the allocation information indicating that the lowest frequency of an allocation band is greater than a predetermined value is associated with the first mapping pattern; and the allocation information indicating that the lowest frequency of an allocation band is equal to or less than the predetermined value is associated with the second mapping pattern.

9 . The terminal according to claim 4 , wherein the plurality of mapping patterns are associated respectively with values of the allocation information corresponding to bandwidths other than a bandwidth allocatable by the allocation information.

10 . The terminal according to claim 1 , wherein:
the plurality of mapping patterns are associated respectively with values of Aperiodic SRS trigger included in the control information; and the control section determines a mapping pattern corresponding to the received Aperiodic SRS trigger, as the specific mapping pattern.

11 . The terminal according to claim 1 , wherein:
the plurality of mapping patterns are associated respectively with a plurality of control channels used for transmission of the control information; and the control section determines a mapping pattern corresponding to a control channel that has been used for transmission of the control information, as the specific mapping pattern.

12 . The terminal according to claim 11 , wherein:
the plurality of mapping patterns include a first mapping pattern and a second mapping pattern that includes a smaller amount of resource to which a DMRS is mapped than the first mapping pattern; a control channel used for transmission of the control information by a macro cell base station is associated with the first mapping pattern; and a control channel used for transmission of the control information by a small cell base station is associated with the second mapping pattern.

13 . The terminal according to claim 1 , wherein:
the plurality of mapping patterns are associated respectively with values of a cyclic shift indicator that is included in the control information and that indicates a cyclic shift value and an orthogonal cover code; and the control section determines a mapping pattern corresponding to the received cyclic shift indicator, as the specific mapping pattern.

14 . The terminal according to claim 13 , wherein:
the plurality of mapping patterns include a first mapping pattern and a second mapping pattern that includes a smaller amount of resource to which a DMRS is mapped than the first mapping pattern; the control section determines a mapping pattern corresponding to the received cyclic shift indicator as the specific mapping pattern when transmission rank is one; and the control section determines the first mapping pattern as the specific mapping pattern when transmission rank is two or greater.

15 . The terminal according to claim 1 , wherein:
the control information includes information indicating the specific mapping pattern and uplink allocation information; and the information indicating the specific mapping pattern is subjected to scrambling different from scrambling used for the allocation information.

16 . A base station comprising:
a control signal generating section that generates uplink control information based on a mapping pattern to be indicated to a terminal from among a plurality of mapping patterns for an uplink demodulation reference signal (DMRS); and a transmission section that transmits the generated control information.

17 . A method of generating a demodulation reference signal (DMRS), comprising:
receiving uplink control information; determining a specific mapping pattern based on the control information from among a plurality of mapping patterns for an uplink DMRS; and generating a DMRS according to the specific mapping pattern.

18 . A transmission method comprising:
generating uplink control information based on a mapping pattern to be indicated to a terminal from among a plurality of mapping patterns for an uplink demodulation reference signal (DMRS); and transmitting the generated control information.

Assignees

• Panasonic Ip Corp America

Inventors

• Wang Lilei
• Takeda Kazuki
• Horiuchi Ayako
• Golitschek Edler Von Elbwart Alexander
• Hoshino Masayuki
• Ogawa Yoshihiko

Classifications

• H04W72/23 Primary

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04L5/0035

  Resource allocation in a cooperative multipoint environment · CPC title

• H04L25/0226

  sounding signals per se · CPC title

• H04W16/32

  Hierarchical cell structures · CPC title

• H04L5/0094

  Indication of how sub-channels of the path are allocated · CPC title