# US 2018/0324018 A1 · Downlink control channel structure for low latency communications > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0324018 A1 - Document ID: US20180324018A1 - Status: Published application - Kind: A1 - Application number: 15/953,878 - Filed: 2018-04-16 - Published: 2018-11-08 - Earliest claimed: 2017-05-05 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Seyedkianoush Hosseini; Shimman Arvind Patel; Wanshi Chen - Web page: https://patentgrep.com/patent/US20180324018A1 ## CPC - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 27/2602: {Signal structure} - H04L 27/2613: {Structure of the reference signals} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 27/2603: {Signal structure ensuring backward compatibility with legacy system} - H04L 27/261: {Details of reference signals} - 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 Methods, systems, and devices for wireless communication are described. In some aspects, a user equipment (UE) may identify a resource block set that includes a data region and a control region, wherein the resource block set spans a portion of a system bandwidth in a shortened transmission time interval (sTTI), wherein the sTTI includes three symbols, wherein the control region occupies the three symbols and includes control information for the UE for the sTTI, and wherein the control region and the data region are frequency division multiplexed. The UE may obtain content in the sTTI based at least in part on the control information. Numerous other aspects are provided. ## Claims ### Claim 1 A method of wireless communication performed by a user equipment (UE), comprising: identifying a resource block set that includes a data region and a control region, wherein the resource block set spans a portion of a system bandwidth in a shortened transmission time interval (sTTI), wherein the sTTI includes three symbols, wherein the control region occupies the three symbols and includes control information for the UE for the sTTI, and wherein the control region and the data region are frequency division multiplexed; and obtaining content in the sTTI based at least in part on the control information. ### Claim 2 (depends on 1) The method of claim 1, wherein the data region occupies the three symbols. ### Claim 3 (depends on 1) The method of claim 1, wherein the control region includes a first portion that includes downlink control information and a second portion that includes uplink control information. ### Claim 4 (depends on 3) The method of claim 3, wherein the first portion and the second portion are frequency division multiplexed. ### Claim 5 (depends on 3) The method of claim 3, wherein the data region is located between the first portion and the second portion within the resource block set. ### Claim 6 (depends on 1) The method of claim 1, wherein the data region is a reallocated data region. ### Claim 7 (depends on 1) The method of claim 1, wherein one or more resources to be used for the data region are signaled in the control region. ### Claim 8 (depends on 1) The method of claim 1, wherein the control region is configured with a demodulation reference signal (DMRS) based reference signal demodulation scheme or a cell-specific reference signal (CRS) based reference signal demodulation scheme. ### Claim 9 (depends on 1) The method of claim 1, wherein the data region is configured with a demodulation reference signal (DMRS) based reference signal demodulation scheme. ### Claim 10 (depends on 1) The method of claim 1, wherein the three symbols include a first symbol that occurs before a second symbol that occurs before a third symbol, and wherein one or more demodulation reference signal (DMRS) signals from at least one of the first symbol or the second symbol are used to demodulate information in the third symbol. ### Claim 11 An apparatus for wireless communication, comprising: a memory; and at least one processor coupled to the memory and configured to: identify a resource block set that includes a data region and a control region, wherein the resource block set spans a portion of a system bandwidth in a shortened transmission time interval (sTTI), wherein the sTTI includes three symbols, wherein the control region occupies the three symbols and includes control information for the apparatus for the sTTI, and wherein the control region and the data region are frequency division multiplexed; and obtain content in the sTTI based at least in part on the control information. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the data region occupies the three symbols. ### Claim 13 (depends on 11) The apparatus of claim 11, wherein the control region includes a first portion that includes downlink control information and a second portion that includes uplink control information. ### Claim 14 (depends on 13) The apparatus of claim 13, wherein the first portion and the second portion are frequency division multiplexed. ### Claim 15 (depends on 13) The apparatus of claim 13, wherein the data region is located between the first portion and the second portion within the resource block set. ### Claim 16 (depends on 11) The apparatus of claim 11, wherein the data region is a reallocated data region. ### Claim 17 (depends on 11) The apparatus of claim 11, wherein one or more resources to be used for the data region are signaled in the control region. ### Claim 18 (depends on 11) The apparatus of claim 11, wherein the control region is configured with a demodulation reference signal (DMRS) based reference signal demodulation scheme or a cell-specific reference signal (CRS) based reference signal demodulation scheme. ### Claim 19 (depends on 11) The apparatus of claim 11, wherein the data region is configured with a demodulation reference signal (DMRS) based reference signal demodulation scheme. ### Claim 20 (depends on 11) The apparatus of claim 11, wherein the three symbols include a first symbol that occurs before a second symbol that occurs before a third symbol, and wherein one or more demodulation reference signal (DMRS) signals from at least one of the first symbol or the second symbol are used to demodulate information in the third symbol. ### Claim 21 A non-transitory computer-readable medium storing computer executable code for wireless communication, comprising code for: identifying a resource block set that includes a data region and a control region, wherein the resource block set spans a portion of a system bandwidth in a shortened transmission time interval (sTTI), wherein the sTTI includes three symbols, wherein the control region occupies the three symbols and includes control information for the sTTI, and wherein the control region and the data region are frequency division multiplexed; and obtaining content in the sTTI based at least in part on the control information. ### Claim 22 (depends on 21) The non-transitory computer-readable medium of claim 21, wherein the data region occupies the three symbols. ### Claim 23 (depends on 21) The non-transitory computer-readable medium of claim 21, wherein the control region includes a first portion that includes downlink control information and a second portion that includes uplink control information, wherein the first portion and the second portion are frequency division multiplexed, and wherein the data region is located between the first portion and the second portion within the resource block set. ### Claim 24 (depends on 21) The non-transitory computer-readable medium of claim 21, wherein the control region is configured with a demodulation reference signal (DMRS) based reference signal demodulation scheme or a cell-specific reference signal (CRS) based reference signal demodulation scheme, and wherein the data region is configured with a DMRS based reference signal demodulation scheme. ### Claim 25 (depends on 21) The non-transitory computer-readable medium of claim 21, wherein the three symbols include a first symbol that occurs before a second symbol that occurs before a third symbol, and wherein one or more demodulation reference signal (DMRS) signals from at least one of the first symbol or the second symbol are used to demodulate information in the third symbol. ### Claim 26 An apparatus for wireless communication, comprising: means for identifying a resource block set that includes a data region and a control region, wherein the resource block set spans a portion of a system bandwidth in a shortened transmission time interval (sTTI), wherein the sTTI includes three symbols, wherein the control region occupies the three symbols and includes control information for the apparatus for the sTTI, and wherein the control region and the data region are frequency division multiplexed; and means for obtaining content in the sTTI based at least in part on the control information. ### Claim 27 (depends on 26) The apparatus of claim 26, wherein the data region occupies the three symbols. ### Claim 28 (depends on 26) The apparatus of claim 26, wherein the control region includes a first portion that includes downlink control information and a second portion that includes uplink control information, wherein the first portion and the second portion are frequency division multiplexed, and wherein the data region is located between the first portion and the second portion within the resource block set. ### Claim 29 (depends on 26) The apparatus of claim 26, wherein the control region is configured with a demodulation reference signal (DMRS) based reference signal demodulation scheme or a cell-specific reference signal (CRS) based reference signal demodulation scheme, and wherein the data region is configured with a DMRS based reference signal demodulation scheme. ### Claim 30 (depends on 26) The apparatus of claim 26, wherein the three symbols include a first symbol that occurs before a second symbol that occurs before a third symbol, and wherein one or more demodulation reference signal (DMRS) signals from at least one of the first symbol or the second symbol are used to demodulate information in the third symbol.