# US 10,313,079 B2 · Common HARQ processes > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,313,079 B2 - Document ID: US10313079B2 - Status: Granted - Kind: B2 - Application number: 14/465,012 - Filed: 2014-08-21 - Published: 2015-02-26 - Granted: 2019-06-04 - Earliest claimed: 2013-08-23 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Srinivas Yerramalli; Tao Luo; Durga Prasad Malladi; Naga Bhushan; Wanshi Chen; Yongbin Wei - Web page: https://patentgrep.com/patent/US10313079B2 ## CPC - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 1/1822: involving configuration of automatic repeat request [ARQ] with parallel processes - H04L 1/1861: {Physical mapping arrangements (for ACK signaling see also H04L5/0053)} - H04L 1/1887: {Scheduling and prioritising arrangements} - H04L 1/1893: {Physical mapping arrangements (physical resource mapping in general H04L5/00)} - H04L 1/1896: {ARQ related signaling} - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 1/1671: {the supervisory signal being transmitted together with control information} - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A sharing of common hybrid automatic repeat request (HARQ) process space by multiple unlicensed spectrum component carriers is described. Because communication access is not guaranteed over the unlicensed spectrum, a set of component carriers in the unlicensed spectrum is assigned to share a common HARQ process space, such that uplink or downlink data will be transmitted over any one or more of the set of component carriers that clear a clear channel assessment (CCA) check. The receiver then provides a HARQ process response over the same HARQ process space using the grouped component carriers that share that common HARQ process space. Thus, any one or more of the set of component carriers sharing the common HARQ process space may both carry the transmitted data and carry the HARQ process response to the attempted data transmission. ## Claims ### Claim 1 A method of wireless communication, comprising: grouping, by a base station, two or more unlicensed spectrum component carriers of a plurality of component carriers assigned for communication by the base station to share a common hybrid automatic repeat request (HARQ) process space, such that same re-transmission data is attempted for transmission on each of at least two of the two or more unlicensed component carriers in response to receipt of a same HARQ process response; performing, by the base station, a clear channel access (CCA) check of each of the two or more unlicensed spectrum component carriers; transmitting, by the base station, downlink data over one or more of the two or more unlicensed spectrum component carriers that clear the CCA check; receiving, by the base station, in response to the transmitting, HARQ process response information associated with the common HARQ process space; and using an explicit HARQ indicator associated with a common HARQ process to notify a user equipment (UE) to expect the same re-transmission data on more than one of the at least two of the two or more unlicensed component carriers. ### Claim 2 (depends on 1) The method of claim 1, wherein the HARQ process response information is received over the one or more of the two or more unlicensed spectrum component carriers that the downlink data was transmitted. ### Claim 3 (depends on 1) The method of claim 1, further including: generating, by the base station, a response to the HARQ process response information; and transmitting, by the base station, the response using the two or more unlicensed spectrum component carriers. ### Claim 4 (depends on 3) The method of claim 3, wherein the response includes one of: a re-transmission of the downlink data or a new transmission of new downlink data. ### Claim 5 (depends on 3) The method of claim 3, wherein the transmitting includes: performing, by the base station, a subsequent CCA check of each of the two or more unlicensed spectrum component carriers; and transmitting, by the base station, the response using each of the two or more unlicensed spectrum component carriers that clear the subsequent CCA check. ### Claim 6 (depends on 1) The method of claim 1, further including: transmitting, by the base station, to one or more user equipments (UEs) served by the base station a HARQ process configuration, wherein the HARQ process configuration includes at least an identification of the two or more unlicensed spectrum component carriers and a priority sequence for the one or more UEs to access the two or more unlicensed spectrum component carriers to receive the downlink data. ### Claim 7 (depends on 1) The method of claim 1, further including: dividing a total HARQ process space into a private HARQ process space for each of the plurality of component carriers and the common HARQ process space shared by the two or more unlicensed spectrum component carriers. ### Claim 8 (depends on 7) The method of claim 7, wherein the common HARQ process space includes a plurality of common HARQ process spaces, and wherein each of the plurality of component carriers are assigned to one or more of the plurality of common HARQ process spaces. ### Claim 9 A method of wireless communication, comprising: receiving, at a user equipment (UE) from a serving base station, identification of two or more unlicensed spectrum component carriers of a plurality of component carriers assigned for communication with the serving base station that are grouped to share a common hybrid automatic repeat request (HARQ) process space, such that same re-transmission data is attempted for transmission on each of at least two of the two or more unlicensed component carriers in response to receipt of a same HARQ process response; detecting, by the UE, receipt of downlink data over at least one of the two or more unlicensed spectrum component carriers of the identification; transmitting, by the UE to the serving base station, in response to the detecting, HARQ process response information associated with the common HARQ process space using at least one of the two or more unlicensed spectrum component carriers; and receiving, by the UE from the serving base station, an explicit HARQ indicator associated with a common HARQ process to notify the UE to expect the same re-transmission data on more than one of the at least two of the two or more unlicensed component carriers. ### Claim 10 (depends on 9) The method of claim 9, wherein the HARQ process response information includes one of: an acknowledgement for receipt of the downlink data or a negative acknowledgement for failed receipt of the downlink data. ### Claim 11 (depends on 9) The method of claim 9, wherein the transmitting includes: performing, by the UE, a clear channel access (CCA) check of each of the two or more unlicensed spectrum component carriers; transmitting, by the UE, the HARQ process response information over each of the two or more unlicensed spectrum component carriers that clear the CCA check. ### Claim 12 (depends on 9) The method of claim 9, further including: receiving, at the UE from the serving base station, a priority sequence for the UE to access the two or more unlicensed spectrum component carriers to detect receipt of the downlink data, wherein the detecting receipt includes accessing the at least one of the two or more unlicensed spectrum component carriers according to the priority sequence to detect the downlink data. ### Claim 13 (depends on 9) The method of claim 9, further including: identifying the downlink data by soft combining data received over the two or more unlicensed spectrum component carriers during the detecting. ### Claim 14 A method of wireless communication, comprising: receiving, at a user equipment (UE) from a serving base station, identification of two or more unlicensed spectrum component carriers of a plurality of component carriers assigned for communication with the serving base station that are grouped to share a common hybrid automatic repeat request (HARQ) process space, such that same re-transmission data is attempted for transmission on each of at least two of the two or more unlicensed component carriers in response to receipt of a same HARQ process response; performing, by the UE, a clear channel access (CCA) check of each of the two or more unlicensed spectrum component carriers; transmitting, by the UE, uplink data over one or more of the two or more unlicensed spectrum component carriers that clear the CCA check; receiving, by the U E, in response to the transmitting, HARQ process response information associated with the common HARQ process space; generating, by the UE, a response to the HARQ process response information; and transmitting, by the UE to the serving base station, the response using each of the two or more unlicensed spectrum component carriers. ### Claim 15 (depends on 14) The method of claim 14, wherein the HARQ process response information is received over the one or more of the two or more unlicensed spectrum component carriers that the uplink data was transmitted. ### Claim 16 (depends on 14) The method of claim 14, wherein the response includes one of: a re-transmission of the uplink data or a new transmission of new uplink data. ### Claim 17 (depends on 14) The method of claim 14, wherein the response includes acknowledgement information and channel quality information. ### Claim 18 (depends on 14) The method of claim 14, wherein the transmitting the response includes: performing, by the UE, a subsequent CCA check of each of the two or more unlicensed spectrum component carriers; and transmitting, by the UE, the response using each of the two or more unlicensed spectrum component carriers that clear the subsequent CCA check. ### Claim 19 A method of wireless communication, comprising: grouping, by a base station, two or more unlicensed spectrum component carriers of a plurality of component carriers assigned for communication by the base station to share a common hybrid automatic repeat request (HARQ) process space, such that same re-transmission data is attempted for transmission on each of at least two of the two or more unlicensed component carriers in response to receipt of a same HARQ process response; detecting, by the base station, receipt of uplink data from a user equipment (UE) over at least one of the two or more unlicensed spectrum component carriers; and transmitting, by the base station to the UE, in response to the detecting, HARQ process response information associated with the common HARQ process space, wherein the HARQ process response information is transmitted using each of the two or more unlicensed spectrum component carriers on which the uplink data receipt is detected. ### Claim 20 (depends on 19) The method of claim 19, wherein the HARQ process response information includes one of: an acknowledgement for receipt of the uplink data or a negative acknowledgement for failed receipt of the uplink data. ### Claim 21 (depends on 19) The method of claim 19, wherein the transmitting the HARQ process response information includes: performing, by the base station, a clear channel access (CCA) check of each of the two or more unlicensed spectrum component carriers; transmitting, by the base station, the HARQ process response information over each of the two or more unlicensed spectrum component carriers that clear the CCA check. ### Claim 22 (depends on 19) The method of claim 19, further including: identifying the uplink data by soft combining data received over the two or more unlicensed spectrum component carriers during the detecting. ### Claim 23 An apparatus configured for wireless communication, comprising: means for grouping, by a base station, two or more unlicensed spectrum component carriers of a plurality of component carriers assigned for communication by the base station to share a common hybrid automatic repeat request (HARQ) process space, such that same re-transmission data is attempted for transmission on each of at least two of the two or more unlicensed component carriers in response to receipt of a same HARQ process response; means for performing, by the base station, a clear channel access (CCA) check of each of the two or more unlicensed spectrum component carriers; means for transmitting, by the base station, downlink data over one or more of the two or more unlicensed spectrum component carriers that clear the CCA check; means for receiving, by the base station, in response to the means for transmitting, HARQ process response information associated with the common HARQ process space; and means for using an explicit HARQ indicator associated with a common HARQ process to notify a user equipment (UE) to expect the same re-transmission data on more than one of the at least two of the two or more unlicensed component carriers. ### Claim 24 (depends on 23) The apparatus of claim 23, wherein the HARQ process response information is received over the one or more of the two or more unlicensed spectrum component carriers that the downlink data was transmitted. ### Claim 25 (depends on 23) The apparatus of claim 23, further including: means for generating, by the base station, a response to the HARQ process response information; and means for transmitting, by the base station, the response using the two or more unlicensed spectrum component carriers. ### Claim 26 (depends on 25) The apparatus of claim 25, wherein the response includes one of: a re-transmission of the downlink data or a new transmission of new downlink data. ### Claim 27 (depends on 25) The apparatus of claim 25, wherein the means for transmitting the response includes: means for performing, by the base station, a subsequent CCA check of each of the two or more unlicensed spectrum component carriers; and means for transmitting, by the base station, the response using each of the two or more unlicensed spectrum component carriers that clear the subsequent CCA check. ### Claim 28 (depends on 23) The apparatus of claim 23 further including: means for transmitting, by the base station, to one or more user equipments (UEs) served by the base station a HARQ process configuration, wherein the HARQ process configuration includes at least an identification of the two or more unlicensed spectrum component carriers and a priority sequence for the one or more UEs to access the two or more unlicensed spectrum component carriers to receive the downlink data. ### Claim 29 (depends on 23) The apparatus of claim 23, further including: means for dividing a total HARQ process space into a private HARQ process space for each of the plurality of component carriers and the common HARQ process space shared by the two or more unlicensed spectrum component carriers. ### Claim 30 (depends on 29) The apparatus of claim 29, wherein the common HARQ process space includes a plurality of common HARQ process spaces, and wherein each of the plurality of component carriers are assigned to one or more of the plurality of common HARQ process spaces. ### Claim 31 An apparatus configured for wireless communication, comprising: means for receiving, at a user equipment (UE) from a serving base station, identification of two or more unlicensed spectrum component carriers of a plurality of component carriers assigned for communication with the serving base station that are grouped to share a common hybrid automatic repeat request (HARQ) process space, such that same re-transmission data is attempted for transmission on each of at least two of the two or more unlicensed component carriers in response to receipt of a same HARQ process response; means for detecting, by the UE, receipt of downlink data over at least one of the two or more unlicensed spectrum component carriers of the identification; means for transmitting, by the UE to the serving base station, in response to the means for detecting, HARQ process response information associated with the common HARQ process space using at least one of the two or more unlicensed spectrum component carriers; and means for receiving, by the UE from the serving base station, an explicit HARQ indicator associated with a common HARQ process to notify the UE to expect the same re-transmission data on more than one of the at least two of the two or more unlicensed component carriers. ### Claim 32 (depends on 31) The apparatus of claim 31, wherein the HARQ process response information includes one of: an acknowledgement for receipt of the downlink data or a negative acknowledgement for failed receipt of the downlink data. ### Claim 33 (depends on 31) The apparatus of claim 31, wherein the means for transmitting includes: means for performing, by the UE, a clear channel access (CCA) check of each of the two or more unlicensed spectrum component carriers; and means for transmitting, by the UE, the HARQ process response information over each of the two or more unlicensed spectrum component carriers that clear the CCA check. ### Claim 34 (depends on 31) The apparatus of claim 31, further including: means for receiving, at the UE from the serving base station, a priority sequence for the UE to access the two or more unlicensed spectrum component carriers to detect receipt of the downlink data, wherein the means for detecting receipt includes means for accessing the at least one of the two or more unlicensed spectrum component carriers according to the priority sequence to detect the downlink data. ### Claim 35 (depends on 31) The apparatus of claim 31, further including: means for identifying the downlink data by soft combining data received over the two or more unlicensed spectrum component carriers during execution of the means for detecting. ### Claim 36 An apparatus configured for wireless communication, comprising: means for receiving, at a user equipment (UE) from a serving base station, identification of two or more unlicensed spectrum component carriers of a plurality of component carriers assigned for communication with the serving base station that are grouped to share a common hybrid automatic repeat request (HARQ) process space, such that same re-transmission data is attempted for transmission on each of at least two of the two or more unlicensed component carriers in response to receipt of a same HARQ process response; means for performing, by the UE, a clear channel access (CCA) check of each of the two or more unlicensed spectrum component carriers; means for transmitting, by the UE, uplink data over one or more of the two or more unlicensed spectrum component carriers that clear the CCA check; means for receiving, by the UE, in response to the means for transmitting, HARQ process response information associated with the common HARQ process space; means for generating, by the UE, a response to the HARQ process response information; and means for transmitting, by the UE to the serving base station, the response using each of the two or more unlicensed spectrum component carriers. ### Claim 37 (depends on 36) The apparatus of claim 36, wherein the HARQ process response information is received over the one or more of the two or more unlicensed spectrum component carriers that the uplink data was transmitted. ### Claim 38 (depends on 36) The apparatus of claim 36, wherein the response includes one of: a re-transmission of the uplink data or a new transmission of new uplink data. ### Claim 39 (depends on 36) The apparatus of claim 36, wherein the response includes acknowledgement information and channel quality information. ### Claim 40 (depends on 36) The apparatus of claim 36, wherein the means for transmitting the response includes: means for performing, by the UE, a subsequent CCA check of each of the two or more unlicensed spectrum component carriers; and means for transmitting, by the UE, the response using each of the two or more unlicensed spectrum component carriers that clear the subsequent CCA check. ### Claim 41 An apparatus configured for wireless communication, comprising: means for grouping, by a base station, two or more unlicensed spectrum component carriers of a plurality of component carriers assigned for communication by the base station to share a common hybrid automatic repeat request (HARQ) process space, such that same re-transmission data is attempted for transmission on each of at least two of the two or more unlicensed component carriers; means for detecting, by the base station, receipt of uplink data from a user equipment (UE) over at least one of the two or more unlicensed spectrum component carriers; and means for transmitting, by the base station to the UE, in response to the means for detecting, HARQ process response information associated with the common HARQ process space, wherein the HARQ process response information is transmitted using each of the two or more unlicensed spectrum component carriers on which the uplink data receipt is detected in response to receipt of a same HARQ process response. ### Claim 42 (depends on 41) The apparatus of claim 41, wherein the HARQ process response information includes one of: an acknowledgement for receipt of the uplink data or a negative acknowledgement for failed receipt of the uplink data. ### Claim 43 (depends on 41) The apparatus of claim 41, wherein the means for transmitting the HARQ process response information includes: means for performing, by the base station, a clear channel access (CCA) check of each of the two or more unlicensed spectrum component carriers; and means for transmitting, by the base station, the HARQ process response information over each of the two or more unlicensed spectrum component carriers that clear the CCA check. ### Claim 44 (depends on 41) The apparatus of claim 41, further including: means for identifying the uplink data by soft combining data received over the two or more unlicensed spectrum component carriers during execution of the means for detecting. ### Claim 45 A non-transitory computer-readable medium having program code recorded thereon, comprising: program code for causing a computer to group, by a base station, two or more unlicensed spectrum component carriers of a plurality of component carriers assigned for communication by the base station to share a common hybrid automatic repeat request (HARQ) process space, such that same re-transmission data is attempted for transmission on each of at least two of the two or more unlicensed component carriers in response to receipt of a same HARQ process response; program code for causing the computer to perform, by the base station, a clear channel access (CCA) check of each of the two or more unlicensed spectrum component carriers; program code for causing the computer to transmit, by the base station, downlink data over one or more of the two or more unlicensed spectrum component carriers that clear the CCA check; program code for causing the computer to receive, by the base station, in response to execution of the program code for causing the computer to transmit, HARQ process response information associated with the common HARQ process space; and program code for causing the computer to use an explicit HARQ indicator associated with a common HARQ process to notify a user equipment (UE) to expect the same re-transmission data on more than one of the at least two of the two or more unlicensed component carriers. ### Claim 46 (depends on 45) The non-transitory computer-readable medium of claim 45, wherein the HARQ process response information is received over the one or more of the two or more unlicensed spectrum component carriers that the downlink data was transmitted. ### Claim 47 (depends on 45) The non-transitory computer-readable medium of claim 45, further including program code for causing the computer to: generate, by the base station, a response to the HARQ process response information; and transmit, by the base station, the response using the two or more unlicensed spectrum component carriers. ### Claim 48 (depends on 47) The non-transitory computer-readable medium of claim 47, wherein the response includes one of: a re-transmission of the downlink data or a new transmission of new downlink data. ### Claim 49 (depends on 47) The non-transitory computer-readable medium of claim 47, wherein the program code for causing the computer to transmit includes program code for causing the computer to: perform, by the base station, a subsequent CCA check of each of the two or more unlicensed spectrum component carriers; and transmit, by the base station, the response using each of the two or more unlicensed spectrum component carriers that clear the subsequent CCA check. ### Claim 50 (depends on 45) The non-transitory computer-readable medium of claim 45, further including program code for causing the computer to: transmit, by the base station, to one or more user equipments (UEs) served by the base station a HARQ process configuration, wherein the HARQ process configuration includes at least an identification of the two or more unlicensed spectrum component carriers and a priority sequence for the one or more UEs to access the two or more unlicensed spectrum component carriers to receive the downlink data. ### Claim 51 (depends on 45) The non-transitory computer-readable medium of claim 45, further including program code for causing the computer to: divide a total HARQ process space into a private HARQ process space for each of the plurality of component carriers and the common HARQ process space shared by the two or more unlicensed spectrum component carriers. ### Claim 52 (depends on 51) The non-transitory computer-readable medium of claim 51, wherein the common HARQ process space includes a plurality of common HARQ process spaces, and wherein each of the plurality of component carriers are assigned to one or more of the plurality of common HARQ process spaces. ### Claim 53 A non-transitory computer-readable medium having program code recorded thereon, comprising: program code for causing a computer to receive, at a user equipment (UE) from a serving base station, identification of two or more unlicensed spectrum component carriers of a plurality of component carriers assigned for communication with the serving base station that are grouped to share a common hybrid automatic repeat request (HARQ) process space, such that same re-transmission data is attempted for transmission on each of at least two of the two or more unlicensed component carriers in response to receipt of a same HARQ process response; program code for causing the computer to detect, by the UE, receipt of downlink data over at least one of the two or more unlicensed spectrum component carriers of the identification; program code for causing the computer to transmit, by the UE to the serving base station, in response to execution of the program code for causing the computer to detect, HARQ process response information associated with the common HARQ process space using at least one of the two or more unlicensed spectrum component carriers; and program code for causing the computer to receive, by the UE from the serving base station, an explicit HARQ indicator associated with a common HARQ process to notify the UE to expect the same re-transmission data on more than one of the at least two of the two or more unlicensed component carriers. ### Claim 54 (depends on 53) The non-transitory computer-readable medium of claim 53, wherein the HARQ process response information includes one of: an acknowledgement for receipt of the downlink data or a negative acknowledgement for failed receipt of the downlink data. ### Claim 55 (depends on 53) The non-transitory computer-readable medium of claim 53, wherein the program code for causing the computer to transmit includes program code for causing the computer to: perform, by the UE, a clear channel access (CCA) check of each of the two or more unlicensed spectrum component carriers; transmit, by the UE, the HARQ process response information over each of the two or more unlicensed spectrum component carriers that clear the CCA check. ### Claim 56 (depends on 53) The non-transitory computer-readable medium of claim 53, further including program code for causing the computer to: receive, at the UE from the serving base station, a priority sequence for the UE to access the two or more unlicensed spectrum component carriers to detect receipt of the downlink data, wherein the program code for causing the computer to detect receipt includes program code for causing the computer to access the at least one of the two or more unlicensed spectrum component carriers according to the priority sequence to detect the downlink data. ### Claim 57 (depends on 53) The non-transitory computer-readable medium of claim 53, further including program code for causing the computer to: identify the downlink data by soft combining data received over the two or more unlicensed spectrum component carriers during execution of the program code for causing the computer to detect. ### Claim 58 A non-transitory computer-readable medium having program code recorded thereon, comprising: program code for causing a computer to receive, at a user equipment (UE) from a serving base station, identification of two or more unlicensed spectrum component carriers of a plurality of component carriers assigned for communication with the serving base station that are grouped to share a common hybrid automatic repeat request (HARQ) process space, such that same re-transmission data is attempted for transmission on each of at least two of the two or more unlicensed component carriers in response to receipt of a same HARQ process response; program code for causing the computer to perform, by the UE, a clear channel access (CCA) check of each of the two or more unlicensed spectrum component carriers; program code for causing the computer to transmit, by the UE, uplink data over one or more of the two or more unlicensed spectrum component carriers that clear the CCA check; program code for causing the computer to receive, by the UE, in response to execution of the program code for causing the computer to transmit, HARQ process response information associated with the common HARQ process space; generate, by the UE, a response to the HARQ process response information; and transmit, by the UE to the serving base station, the response using each of the two or more unlicensed spectrum component carriers. ### Claim 59 (depends on 58) The non-transitory computer-readable medium of claim 58, wherein the HARQ process response information is received over the one or more of the two or more unlicensed spectrum component carriers that the uplink data was transmitted. ### Claim 60 (depends on 58) The non-transitory computer-readable medium of claim 58, wherein the response includes one of: a re-transmission of the uplink data or a new transmission of new uplink data. ### Claim 61 (depends on 58) The non-transitory computer-readable medium of claim 58, wherein the response includes acknowledgement information and channel quality information. ### Claim 62 (depends on 58) The non-transitory computer-readable medium of claim 58, wherein the program code for causing the computer to transmit the response includes program code for causing the computer to: perform, by the UE, a subsequent CCA check of each of the two or more unlicensed spectrum component carriers; and transmit, by the UE, the response using each of the two or more unlicensed spectrum component carriers that clear the subsequent CCA check. ### Claim 63 A non-transitory computer-readable medium having program code recorded thereon, comprising: program code for causing a computer to group, by a base station, two or more unlicensed spectrum component carriers of a plurality of component carriers assigned for communication by the base station to share a common hybrid automatic repeat request (HARQ) process space, such that same re-transmission data is attempted for transmission on each of at least two of the two or more unlicensed component carriers in response to receipt of a same HARQ process response; program code for causing the computer to detect, by the base station, receipt of uplink data from a user equipment (UE) over at least one of the two or more unlicensed spectrum component carriers; and program code for causing the computer to transmit, by the base station to the UE, in response to execution of the program code for causing the computer to detect, HARQ process response information associated with the common HARQ process space, wherein the HARQ process response information is transmitted using each of the two or more unlicensed spectrum component carriers on which the uplink data receipt is detected. ### Claim 64 (depends on 63) The non-transitory computer-readable medium of claim 63, wherein the HARQ process response information includes one of: an acknowledgement for receipt of the uplink data or a negative acknowledgement for failed receipt of the uplink data. ### Claim 65 (depends on 63) The non-transitory computer-readable medium of claim 63, wherein the program code for causing the computer to transmit the HARQ process response information includes program code for causing the computer to: perform, by the base station, a clear channel access (CCA) check of each of the two or more unlicensed spectrum component carriers; and transmit, by the base station, the HARQ process response information over each of the two or more unlicensed spectrum component carriers that clear the CCA check. ### Claim 66 (depends on 63) The non-transitory computer-readable medium of claim 63, further including program code for causing the computer to: identify the uplink data by soft combining data received over the two or more unlicensed spectrum component carriers during the detecting. ### Claim 67 An apparatus configured for wireless communication, the apparatus comprising: at least one processor; and a memory coupled to the at least one processor, wherein the at least one processor is configured: to group, by a base station, two or more unlicensed spectrum component carriers of a plurality of component carriers assigned for communication by the base station to share a common hybrid automatic repeat request (HARQ) process space, such that same re-transmission data is attempted for transmission on each of at least two of the two or more unlicensed component carriers in response to receipt of a same HARQ process response; to perform, by the base station, a clear channel access (CCA) check of each of the two or more unlicensed spectrum component carriers; to transmit, by the base station, downlink data over one or more of the two or more unlicensed spectrum component carriers that clear the CCA check; to receive, by the base station, in response to execution of the configuration of the at least one processor to transmit, HARQ process response information associated with the common HARQ process space; and to use an explicit HARQ indicator associated with a common HARQ process to notify a user equipment (UE) to expect the same re-transmission data on more than one of the at least two of the two or more unlicensed component carriers. ### Claim 68 (depends on 67) The apparatus of claim 67, wherein the HARQ process response information is received over the one or more of the two or more unlicensed spectrum component carriers that the downlink data was transmitted. ### Claim 69 (depends on 67) The apparatus of claim 67, further including configuration of the at least one processor to: generate, by the base station, a response to the HARQ process response information; and transmit, by the base station, the response using the two or more unlicensed spectrum component carriers. ### Claim 70 (depends on 69) The apparatus of claim 69, wherein the response includes one of: a re-transmission of the downlink data or a new transmission of new downlink data. ### Claim 71 (depends on 69) The apparatus of claim 69, wherein the configuration of the at least one processor to transmit includes configuration of the at least one processor to: perform, by the base station, a subsequent CCA check of each of the two or more unlicensed spectrum component carriers; and transmit, by the base station, the response using each of the two or more unlicensed spectrum component carriers that clear the subsequent CCA check. ### Claim 72 (depends on 67) The apparatus of claim 67, further including configuration of the at least one processor to: transmit, by the base station, to one or more user equipments (UEs) served by the base station a HARQ process configuration, wherein the HARQ process configuration includes at least an identification of the two or more unlicensed spectrum component carriers and a priority sequence for the one or more UEs to access the two or more unlicensed spectrum component carriers to receive the downlink data. ### Claim 73 (depends on 67) The apparatus of claim 67, further including configuration of the at least one processor to: divide a total HARQ process space into a private HARQ process space for each of the plurality of component carriers and the common HARQ process space shared by the two or more unlicensed spectrum component carriers. ### Claim 74 (depends on 73) The apparatus of claim 73, wherein the common HARQ process space includes a plurality of common HARQ process spaces, and wherein each of the plurality of component carriers are assigned to one or more of the plurality of common HARQ process spaces. ### Claim 75 An apparatus configured for wireless communication, the apparatus comprising: at least one processor; and a memory coupled to the at least one processor, wherein the at least one processor is configured: to receive, at a user equipment (UE) from a serving base station, identification of two or more unlicensed spectrum component carriers of a plurality of component carriers assigned for communication with the serving base station that are grouped to share a common hybrid automatic repeat request (HARQ) process space, such that same re-transmission data is attempted for transmission on each of at least two of the two or more unlicensed component carriers in response to receipt of a same HARQ process response; to detect, by the UE, receipt of downlink data over at least one of the two or more unlicensed spectrum component carriers of the identification; and to transmit, by the UE to the serving base station, in response to execution of the configuration of the at least one processor to detect, HARQ process response information associated with the common HARQ process space using at least one of the two or more unlicensed spectrum component carriers; and to receive, by the UE from the serving base station, an explicit HARQ indicator associated with a common HARQ process to notify the UE to expect the same re-transmission data on more than one of the at least two of the two or more unlicensed component carriers. ### Claim 76 (depends on 75) The apparatus of claim 75, wherein the HARQ process response information includes one of: an acknowledgement for receipt of the downlink data or a negative acknowledgement for failed receipt of the downlink data. ### Claim 77 (depends on 75) The apparatus of claim 75, wherein the configuration of the at least one processor to transmit includes configuration of the at least one processor to: perform, by the UE, a clear channel access (CCA) check of each of the two or more unlicensed spectrum component carriers; and transmit, by the UE, the HARQ process response information over each of the two or more unlicensed spectrum component carriers that clear the CCA check. ### Claim 78 (depends on 75) The apparatus of claim 75, further including configuration of the at least one processor to: receive, at the UE from the serving base station, a priority sequence for the UE to access the two or more unlicensed spectrum component carriers to detect receipt of the downlink data, wherein the configuration of the at least one processor to detect receipt includes configuration of the at least one processor to access the at least one of the two or more unlicensed spectrum component carriers according to the priority sequence to detect the downlink data. ### Claim 79 (depends on 75) The apparatus of claim 75, further including configuration of the at least one processor to: identify the downlink data by soft combining data received over the two or more unlicensed spectrum component carriers during execution of the configuration of the at least one processor to detect. ### Claim 80 An apparatus configured for wireless communication, the apparatus comprising: at least one processor; and a memory coupled to the at least one processor, wherein the at least one processor is configured: to receiving, at a user equipment (UE) from a serving base station, identification of two or more unlicensed spectrum component carriers of a plurality of component carriers assigned for communication with the serving base station that are grouped to share a common hybrid automatic repeat request (HARQ) process space, such that same re-transmission data is attempted for transmission on each of at least two of the two or more unlicensed component carriers in response to receipt of a same HARQ process response; to perform, by the UE, a clear channel access (CCA) check of each of the two or more unlicensed spectrum component carriers; to transmit, by the UE, uplink data over one or more of the two or more unlicensed spectrum component carriers that clear the CCA check; to receive, by the UE, in response to execution of the configuration of the at least one processor to transmit, HARQ process response information associated with the common HARQ process space; generate, by the UE, a response to the HARQ process response information; and transmit, by the UE to the serving base station, the response using the two or more unlicensed spectrum component carriers. ### Claim 81 (depends on 80) The apparatus of claim 80, wherein the HARQ process response information is received over the one or more of the two or more unlicensed spectrum component carriers that the uplink data was transmitted. ### Claim 82 (depends on 80) The apparatus of claim 80, wherein the response includes one of: a re-transmission of the uplink data or a new transmission of new uplink data. ### Claim 83 (depends on 80) The apparatus of claim 80, wherein the response includes acknowledgement information and channel quality information. ### Claim 84 (depends on 80) The apparatus of claim 80, wherein the configuration of the at least one processor to transmit the response includes configuration of the at least one processor to: perform, by the UE, a subsequent CCA check of each of the two or more unlicensed spectrum component carriers; and transmit, by the UE, the response using each of the two or more unlicensed spectrum component carriers that clear the subsequent CCA check. ### Claim 85 An apparatus configured for wireless communication, the apparatus comprising: at least one processor; and a memory coupled to the at least one processor, wherein the at least one processor is configured: to group, by a base station, two or more unlicensed spectrum component carriers of a plurality of component carriers assigned for communication by the base station to share a common hybrid automatic repeat request (HARQ) process space, such that same re-transmission data is attempted for transmission on each of at least two of the two or more unlicensed component carriers in response to receipt of a same HARQ process response; to detect, by the base station, receipt of uplink data from a user equipment (UE) over at least one of the two or more unlicensed spectrum component carriers; and to transmit, by the base station to the UE, in response to execution of the configuration of the at least one processor to detect, HARQ process response information associated with the common HARQ process space, wherein the HARQ process response information is transmitted using each of the two or more unlicensed spectrum component carriers on which the uplink data receipt is detected. ### Claim 86 (depends on 85) The apparatus of claim 85, wherein the HARQ process response information includes one of: an acknowledgement for receipt of the uplink data or a negative acknowledgement for failed receipt of the uplink data. ### Claim 87 (depends on 85) The apparatus of claim 85, wherein the configuration of the at least one processor to transmit the HARQ process response information includes configuration of the at least one processor to: perform, by the base station, a clear channel access (CCA) check of each of the two or more unlicensed spectrum component carriers; and transmit, by the base station, the HARQ process response information over each of the two or more unlicensed spectrum component carriers that clear the CCA check. ### Claim 88 (depends on 85) The apparatus of claim 85, further including configuration of the at least one processor to: identify the uplink data by soft combining data received over the two or more unlicensed spectrum component carriers during the detecting.