# US 2018/0323935 A1 · Configuration of downlink and uplink partial subframes in shared radio frequency spectrum > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0323935 A1 - Document ID: US20180323935A1 - Status: Published application - Kind: A1 - Application number: 15/969,536 - Filed: 2018-05-02 - Published: 2018-11-08 - Earliest claimed: 2017-05-05 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Srinivas Yerramalli; Jing Sun; Wanshi Chen; Alberto Rico Alvarino; Peter Gaal - Web page: https://patentgrep.com/patent/US20180323935A1 ## CPC - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - 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 25/02: Details {; arrangements for supplying electrical power along data transmission lines (systems for transmitting signals via power distribution lines H04B3/54)} - H04W 16/14: Spectrum sharing arrangements {between different networks} - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Configuration of downlink and uplink partial subframes in shared radio frequency (RF) spectrum is discussed. The various described aspects provide for different configurations for start and end transmissions from base stations and user equipments (UEs) when transmitting over partial subframes. With downlink initial partial subframes, a uniform puncturing may be used to reduce the number of resource elements (REs) available for downlink transmission without causing the base station to re-precode any of the data. Additional aspect for downlink partial subframe transmission allows for downlink control channels to identify multiple start points within the subframe at short downlink shared channel locations. On the uplink aspect, UEs may be informed with configurations for both full and partial subframe transmissions. The UE will select which configuration to use based on whether it will transmit on full or partial subframes. Additionally, a UE have scheduled or semi-scheduled modes for partial subframe transmissions. ## Claims ### Claim 1 A method of wireless communication, comprising: receiving, at a user equipment (UE) from a serving base station, downlink control information identifying an uplink transmission start in a second slot of a subframe; receiving, at the UE from the serving base station, an uplink configuration for transmission over a partial subframe; and transmitting, by the UE, uplink data over the partial subframe in the second slot according to the uplink configuration. ### Claim 2 (depends on 1) The method of claim 1, wherein an ending of the transmitting is defined at symbol 6 of the second slot. ### Claim 3 A method of wireless communication, comprising: receiving, at a user equipment (UE) from a serving base station, an uplink grant identifying an uplink transmission over a full length of a subframe; detecting, by the UE, failure of a listen before talk (LBT) procedure for transmission over the full length of the subframe; detecting by the UE, success of a next LBT procedure at a subsequent symbol of the subframe; and transmitting, by the UE, uplink data in a starting symbol of the subframe after the success of the next LBT procedure. ### Claim 4 (depends on 3) The method of claim 3, wherein the transmitting includes: puncturing, by the UE, all symbols of the subframe from a first symbol of the subframe to the starting symbol. ### Claim 5 (depends on 3) The method of claim 3, further including: identifying, by the UE, the starting symbol for the transmitting the uplink data; transmitting, by the UE, prior to the transmitting the uplink data, a demodulation reference signal shifted by a selected cyclic shift, wherein the selected cyclic shift is associated with the starting symbol. ### Claim 6 A method of wireless communication, comprising: sending, by a base station, an uplink grant to a user equipment, wherein the uplink grant identifies uplink transmission for a full length of a subframe; monitoring, by the base station, for a demodulation reference signal transmitted by the UE; determining, by the base station, that the UE performs the uplink transmission in a first slot in response to detecting the demodulation reference signal in the first slot; and determining, by the base station, that the UE performs the uplink transmission outside of the first slot in response to detecting the demodulation reference signal outside of the first slot. ### Claim 7 (depends on 6) The method of claim 6, wherein the determining that the UE performs the uplink transmission outside of the first slot includes: detecting, by the base station, a cyclic shift of the demodulation reference signal; and identifying, by the base station, an uplink starting slot based on the detected cyclic shift, wherein the detected cyclic shift is associated with the uplink starting slot. ### Claim 8 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, an uplink grant identifying an uplink transmission over a full length of a subframe; to detect, by the UE, failure of a listen before talk (LBT) procedure for transmission over the full length of the subframe; to detect by the UE, success of a next LBT procedure at a subsequent symbol of the subframe; and to transmit, by the UE, uplink data in a starting symbol of the subframe after the success of the next LBT procedure. ### Claim 9 (depends on 8) The apparatus of claim 8, wherein the configuration of the at least one processor to transmit includes configuration of the at least one processor to punctue, by the UE, all symbols of the subframe from a first symbol of the subframe to the starting symbol. ### Claim 10 (depends on 8) The apparatus of claim 8, further including configuration of the at least one processor: to identify, by the UE, the starting symbol for the configuration of the at least one processor to transmit the uplink data; to transmit, by the UE, prior to the configuration of the at least one processor to transmit the uplink data, a demodulation reference signal shifted by a selected cyclic shift, wherein the selected cyclic shift is associated with the starting symbol.