# US 10,375,626 B2 · Method and apparatus for transmitting downlink response to uplink transmission, and method and apparatus for transmitting synchronization signal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,375,626 B2 - Document ID: US10375626B2 - Status: Granted - Kind: B2 - Application number: 15/399,294 - Filed: 2017-01-05 - Published: 2017-07-13 - Granted: 2019-08-06 - Earliest claimed: 2016-01-07 - Assignees: Electronics and Telecommunications Research Institute - Applicants: Electronics and Telecommunications Research Institute - Inventors: Choongil Yeh; JaeSheung Shin - Web page: https://patentgrep.com/patent/US10375626B2 ## CPC - H04W 48/12: using downlink control channel - H04L 1/00: Arrangements for detecting or preventing errors in the information received {(correcting synchronisation H04L7/00)} - H04L 1/0061: {Error detection codes} - H04L 1/1614: {using bitmaps} - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## 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 ### Claim 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; 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 narrowband subframe number. ### Claim 2 (depends on 1) 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. ### Claim 3 (depends on 1) 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. ### Claim 4 (depends on 1) 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. ### Claim 5 (depends on 1) 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. ### Claim 6 (depends on 1) 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. ### Claim 7 (depends on 1) 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. ### Claim 8 (depends on 1) 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. ### Claim 9 (depends on 1) 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. ### Claim 10 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, wherein a TTI for the first terminal group corresponds to one narrowband subframe including a plurality of subframes, and a TTI for the second terminal group corresponds to a plurality of narrowband subframes. ### Claim 11 (depends on 10) The transmitting method of claim 10, 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. ### Claim 12 (depends on 10) The transmitting method of claim 10, 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. ### Claim 13 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, 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. ### Claim 14 (depends on 13) 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.