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Document Type and Number:
WIPO Patent Application WO/2018/020959
Kind Code:
Provided is a user device in a wireless communication system having a base station and the user device, the user device comprising: a determination unit that determines the size of a soft buffer to be ensured in the user device, on the basis of the total soft buffer size corresponding to the UE category of the user device, a modulation format set for downlink by the base station, and the number of MIMO layers set for downlink by the base station; and a reception unit that stores data received from the base station in the soft buffer having the size determined by the determination unit, wherein the UE category is the UE category that includes 2 layers, 4 layers, and 8 layers as the maximum number of MIMO layers to be supported and that includes 64QAM and 256QAM as the modulation format to be supported.

TAKAHASHI, Hideaki (INC. SANNO PARK TOWER 11-1, Nagatacho 2-chome, Chiyoda-k, Tokyo 50, 〒1006150, JP)
OOKUBO, Naoto (INC. SANNO PARK TOWER 11-1, Nagatacho 2-chome, Chiyoda-k, Tokyo 50, 〒1006150, JP)
TAKEDA, Kazuaki (INC. SANNO PARK TOWER 11-1, Nagatacho 2-chome, Chiyoda-k, Tokyo 50, 〒1006150, JP)
Application Number:
Publication Date:
February 01, 2018
Filing Date:
July 03, 2017
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NTT DOCOMO, INC. (11-1, Nagatacho 2-chome Chiyoda-k, Tokyo 50, 〒1006150, JP)
International Classes:
H04W28/04; H04B7/0413; H04L1/16; H04W16/28
Domestic Patent References:
Other References:
HUAWEI, HISILICON: "CR to 36.306 on new DL UE categories", 3GPP TSG-RAN#67 RP-150458, March 2015 (2015-03-01), XP050933137, Retrieved from the Internet
ERICSSON: "Remaining issues on UE category design", 3GPP TSG-RAN WG1#78B RL-144270, October 2014 (2014-10-01), XP050872848, Retrieved from the Internet
HUAWEI, HISILICON: "Discussion on UE category with introduction of 256QAM", 3GPP TSG- RAN WG1#76 RL-140036, February 2014 (2014-02-01), XP050751761, Retrieved from the Internet
ERICSSON: "UE category solution for 256QAM suppor t", 3GPP TSG-RAN WG1#78 RL-143314, August 2014 (2014-08-01), XP050788786, Retrieved from the Internet
HUAWEI: "Sprint, Orange, China Unicom, HTC, HiSilicon, Huawei Device, New UE DL categories for 1.2 Gbps and 1.6 Gbps for Rel-13", 3GPP RAN #72 RP-161007, June 2016 (2016-06-01), XP055470467, Retrieved from the Internet
See also references of EP 3493585A4
Attorney, Agent or Firm:
ITOH, Tadashige et al. (16th Floor, Marunouchi MY PLAZA 1-1, Marunouchi 2-chome, Chiyoda-k, Tokyo 05, 〒1000005, JP)
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