METHOD AND APPARATUS FOR TRANSMITTING DOWNLINK RESPONSE TO UPLINK TRANSMISSION, AND METHOD AND APPARATUS FOR TRANSMITTING SYNCHRONIZATION SIGNAL

• US 20170201932A1
• Filed: 01/05/2017
• Published: 07/13/2017
• Est. Priority Date: 01/07/2016
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: SHIN, JaeSheung, YEH, Choongil
• Granted Patent: US 10,375,626 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/1614 using bitmaps
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A base station determines whether a reception of each uplink signal transmitted by a plurality of terminals succeeds. The base station generates a response bit map representing whether the reception succeeds. Further, the base station transmits first downlink control information (DCI) including the response bit map to the plurality of terminals through a first downlink control channel.

Claims

1. A transmitting method of a base station, comprising:

determining whether a reception of each uplink signal transmitted by a plurality of terminals succeeds;

generating a response bit map representing whether the reception succeeds; and

transmitting first downlink control information (DCI) including the response bit map to the plurality of terminals through a first downlink control channel.

2. The transmitting method of claim 1, further comprising:

transmitting a location of a bit for a first terminal among the plurality of terminals among a plurality of bits included in the response bit map to the first terminal using second DCI.

3. The transmitting method of claim 1, further comprising:

setting a location of a bit for a first terminal among the plurality of terminals among a plurality of bits included in the response bit map in the first terminal using radio resource control (RRC) signaling.

4. The transmitting method of claim 1, further comprising:

including a radio network temporary identifier (RNTI) for decoding of the first downlink control channel in second DCI for allocating an uplink resource for a transmission of the uplink signal,

wherein the transmitting of the first DCI includes;

scrambling a cyclic redundancy check (CRC) associated with the first DCI using the RNTI.

5. The transmitting method of claim 1, further comprising:

setting a radio network temporary identifier (RNTI) for decoding of the first downlink control channel in the plurality of terminals by radio resource control (RRC) signaling.

6. The transmitting method of claim 1, wherein:

one narrowband subframe for a narrowband system to which the plurality of terminals belong includes a plurality of subframes, and

a radio network temporary identifier (RNTI) for decoding of the first downlink control channel is determined based on a function using a narrowband subframe number as an input variable.

7. The transmitting method of claim 1, further comprising:

transmitting second DCI including a radio network temporary identifier (RNTI) for decoding of the first downlink control channel through a second downlink control channel in a first narrowband subframe including a plurality of subframes for a narrowband system to which the plurality of terminals belong; and

granting an uplink resource for a transmission of the uplink signal present in a second narrowband subframe subsequent to the first narrowband subframe to the plurality of terminals, using a third downlink control channel different from the second downlink control channel in the first narrowband subframe.

8. The transmitting method of claim 1, wherein:

a coverage for a narrowband system to which the plurality of terminals belong includes a normal coverage, an extended coverage larger than the normal coverage, and an extreme coverage larger than the extended coverage, and

a transmission time interval (TTI) for a first terminal belonging to the normal coverage among the plurality of terminals, a TTI for a second terminal belonging to the extended coverage, and a TTI for a third terminal belonging to the extreme coverage are the same.

9. The transmitting method of claim 1, further comprising:

granting an uplink resource for a transmission of the uplink signal present in a second narrowband subframe subsequent to a first narrowband subframe to the plurality of terminals, using a second downlink control channel in the first narrowband subframe including a plurality of subframes for a narrowband system to which the plurality of terminals belong,

wherein the transmitting of the first DCI includes;

transmitting the first DCI to the plurality of terminals in a third narrowband subframe subsequent to the second narrowband subframe.

10. The transmitting method of claim 1, wherein:

each of a plurality of bits included in the response bit map represents a hybrid automatic repeat request (HARQ)-acknowledgement (ACK) for the uplink signal.

11. A transmitting method of a base station, comprising:

scheduling an uplink resource in a first terminal group belonging to a first coverage and a second terminal group belonging to a second coverage larger than the first coverage in different transmission time interval (TTI) units;

generating a response bit map representing whether a reception of a plurality of uplink signals transmitted through the uplink resource succeeds; and

transmitting the response bit map using a first downlink control channel.

12. The transmitting method of claim 11, wherein:

a TTI for the first terminal group corresponds to one narrowband subframe including a plurality of subframes for a narrowband system, and

a TTI for the second terminal group corresponds to a plurality of narrowband subframes.

13. The transmitting method of claim 11, wherein:

the scheduling of the uplink resource includes;

granting a first uplink resource present in a plurality of second narrowband subframes subsequent to a first narrowband subframe to the second terminal group, using a second downlink control channel in the first narrowband subframe including a plurality of subframes for a narrowband system.

14. The transmitting method of claim 13, wherein:

the transmitting of the response bit map includes;

transmitting downlink control information (DCI) including the response bit map to the second terminal group in a third narrowband subframe subsequent to the plurality of second narrowband subframes, using a common search space (CSS) for the first downlink control channel.

15. The transmitting method of claim 11, wherein:

a hybrid automatic repeat request-acknowledgement-radio network temporary identifier (HARQ-ACK-RNTI) for decoding of the first downlink control channel has different values per the first coverage and the second coverage.

16. The transmitting method of claim 11, wherein:

a hybrid automatic repeat request-acknowledgement-radio network temporary identifier (HARQ-ACK-RNTI) for decoding of the first downlink control channel is determined based on a value corresponding to a narrowband subframe number including a plurality of subframes for a narrowband system and a kind of coverage.

17. A transmitting method of a base station, comprising:

generating a first synchronization signal sequence using a Zadoff-Chu sequence;

generating a plurality of second synchronization signal sequences by cyclically shifting the first synchronization signal sequence;

mapping the first synchronization signal sequence to a first time domain symbol among a plurality of time domain symbols belonging to a first subframe; and

mapping each of the plurality of second synchronization signal sequences to a plurality of second time domain symbols among the plurality of time domain symbols belonging to the first subframe.

18. The transmitting method of claim 17, further comprising:

generating a third synchronization signal sequence that is a complex conjugate sequence of the first synchronization signal sequence;

generating a plurality of fourth synchronization signal sequences by cyclically shifting the third synchronization signal sequence;

mapping the third synchronization signal sequence to a third time domain symbol among a plurality of time domain symbols belonging to a second subframe in which the predetermined number of subframes elapses from the first subframe; and

mapping each of the plurality of fourth synchronization signal sequences to a plurality of fourth time domain symbols among the plurality of time domain symbols belonging to the second subframe.

19. The transmitting method of claim 17, wherein:

the first time domain symbol and the plurality of second time domain symbols correspond to the rest time domain symbols other than first three time domain symbols among 14 time domain symbols belonging to the first subframe.

20. The transmitting method of claim 17, wherein:

the generating of the first synchronization signal sequence includes;

generating the first synchronization signal sequence using the Zadoff-Chu sequence of which the length is 11; and

adding some of 11 elements belonging to the first synchronization signal sequence subsequent to a final element of the first synchronization signal sequence.