USER TERMINAL, RADIO BASE STATION AND ADAPTIVE MODULATION AND CODING METHOD

• US 20170231000A1
• Filed: 04/25/2017
• Published: 08/10/2017
• Est. Priority Date: 01/29/2013
• Status: Active Grant

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Mu, Qin, Jiang, Yu, Nagata, Satoshi, Liu, Liu, Chen, Lan
• Granted Patent: US 10,136,451 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 17/309 Measuring or estimating channel quality parameters
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 27/2275 wherein the carrier recovery circuit uses the received modulated signals
• CPC Class Codes: H04L 27/2692 with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver
• CPC Class Codes: H04L 27/34 Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/51 based on terminal or device properties
• CPC Class Codes: H04W 74/002 Transmission of channel access control information

Abstract

In one aspect, the adaptive modulation and coding method includes, in a user terminal, receiving a modulation and coding scheme (MCS) index, acquiring a modulation order corresponding to the received MCS index as a modulation order of a downlink shared channel, from a first table in which MCS indexes are associated with modulation orders including 8 and transport block size (TBS) indexes, and a second table is provided in which MCS indexes are associated with modulation orders of less than 8 and TBS indexes, and the first table is provided by puncturing a combination of a modulation order and a TBS index in the second table so that the first table and the second table are equal in a number of bits for an MCS index. In other aspects, a user terminal and a radio base station are provided.

Claims

1. A user terminal comprising:

a receiving section that receives a modulation and coding scheme (MCS) index; and

an acquisition section that acquires a modulation order corresponding to received MCS index as a modulation order of a downlink shared channel, from a first table in which MCS indexes are associated with modulation orders including 8 and transport block size (TBS) indexes,

wherein a second table is provided in which MCS indexes are associated with modulation orders of less than 8 and TBS indexes, and

the first table is provided by puncturing a combination of a modulation order and a TBS index in the second table so that the first table and the second table are equal in a number of bits for an MCS index.

2. The user terminal according to claim 1, wherein the first table is provided by puncturing at least one of combinations of a lowest modulation order and a TBS index in the second table.

3. The user terminal according to claim 1, wherein the first table is provided by puncturing a combination of a modulation order and a TBS index in the second table, the combination being determined based on contribution to throughput.

4. The user terminal according to claim 1, wherein the acquisition section acquires a TBS index corresponding to the received MCS index from the first table,

the acquisition section acquires, from a third table in which the TBS indexes are associated with numbers of physical resource blocks (PRBs) and TBSs, a TBS corresponding to the TBS index acquired from the first table and a number of PRBs allocated to the downlink shared channel, and

in the third table, one or more TBSs corresponding to one or more TBS indexes for 256 QAM are defined.

9. The user terminal according to claim 2, wherein the first table is provided by puncturing a combination of a modulation order and a TBS index in the second table, the combination being determined based on contribution to throughput.

10. The user terminal according to claim 2, wherein

the acquisition section acquires a TBS index corresponding to the received MCS index from the first table,

the acquisition section acquires, from a third table in which the TBS indexes are associated with numbers of physical resource blocks (PRBs) and TBSs, a TBS corresponding to the TBS index acquired from the first table and a number of PRBs allocated to the downlink shared channel, and

in the third table, one or more TBSs corresponding to one or more TBS indexes for 256 QAM are defined.

11. The user terminal according to claim 3, wherein

the acquisition section acquires a TBS index corresponding to the received MCS index from the first table,

the acquisition section acquires, from a third table in which the TBS indexes are associated with numbers of physical resource blocks (PRBs) and TBSs, a TBS corresponding to the TBS index acquired from the first table and a number of PRBs allocated to the downlink shared channel, and

in the third table, one or more TBSs corresponding to one or more TBS indexes for 256 QAM are defined.

12. The user terminal according to claim 9, wherein

the acquisition section acquires a TBS index corresponding to the received MCS index from the first table,

the acquisition section acquires, from a third table in which the TBS indexes are associated with numbers of physical resource blocks (PRBs) and TBSs, a TBS corresponding to the TBS index acquired from the first table and a number of PRBs allocated to the downlink shared channel, and

in the third table, one or more TBSs corresponding to one or more TBS indexes for 256 QAM are defined.

5. A radio base station comprising:

an acquisition section that acquires a modulation and coding scheme (MCS) index indicating a modulation order used for modulation of a downlink shared channel from a first table in which MCS indexes are associated with modulation orders including 8 and transport block size (TBS) indexes; and

a transmitting section that transmits the MCS index,

wherein a second table is provided in which MCS indexes are associated with modulation orders of less than 8 and TBS indexes, and

the first table is provided by puncturing at least one combination of a modulation order and a TBS index in the second table so that the first table and the second table are equal in a number of bits for an MCS index,

wherein a second table is provided in which MCS indexes are associated with modulation orders of less than 8 and TBS indexes, and

the first table is provided by puncturing at least one combination of a modulation order and a TBS index in the second table so that the first table and the second table are equal in a number of bits for an MCS index.

6. The radio base station according to claim 5, wherein the first table is provided by puncturing at least one of combinations of a lowest modulation order and a TBS index in the second table.

7. The radio base station according to claim 5, wherein the first table is provided by puncturing a combination of a modulation order and a TBS index in the second table, the combination being determined based on contribution to throughput.

13. The radio base station according to claim 6, wherein the first table is provided by puncturing a combination of a modulation order and a TBS index in the second table, the combination being determined based on contribution to throughput.

8. An adaptive modulation and coding method comprising the steps of:

in a user terminal,

receiving a modulation and coding scheme (MCS) index; and

acquiring a modulation order corresponding to received MCS index as a modulation order of a downlink shared channel, from a first table in which MCS indexes are associated with modulation orders including 8 and transport block size (TBS) indexes, and

wherein a second table is provided in which MCS indexes are associated with modulation orders of less than 8 and TBS indexes, and

the first table is provided by puncturing at least one combination of a modulation order and a TBS index in the second table so that the first table and the second table are equal in a number of bits for an MCS index.