# US 2014/0233474 A1 · Method, device and system for transmitting enhanced downlink control channel > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0233474 A1 - Document ID: US20140233474A1 - Status: Published application - Kind: A1 - Application number: 14/182,558 - Filed: 2014-02-18 - Published: 2014-08-21 - Earliest claimed: 2011-08-18 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Qiang WU; Yiqun QIAN; Yang LI; Jianghua LlU - Web page: https://patentgrep.com/patent/US20140233474A1 ## CPC - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 5/0016: {Time-frequency-code} - H04L 5/0023: {Time-frequency-space} - H04L 5/0026: {Division using four or more dimensions, e.g. beam steering or quasi-co-location [QCL]} - 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 - 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 The present invention discloses a method, a device and a system for transmitting an enhanced downlink control channel, which belong to the communications field. The method for sending an enhanced downlink control channel includes: presetting a multiplexing unit, where the multiplexing unit includes at least one resource block pair, and the at least one resource block pair includes E-PDCCH resources and DM RS resources, and the E-PDCCH resources include multiple control channel elements; sending at least one E-PDCCH corresponding to at least one UE in at least one control channel element of the multiplexing unit, and sending the DM RS corresponding to the at least one UE. The present invention reduces the granularity of an enhanced downlink control channel, saves resources and enhances the downlink control channel, thereby providing more control channels for the UE to use. ## Claims ### Claim 1 A method for sending an enhanced downlink control channel, comprising: presetting a multiplexing unit, wherein the multiplexing unit comprises at least one resource block pair, the at least one resource block pair comprises enhanced downlink control channel E-PDCCH resources and demodulation reference DM RS resources, and the E-PDCCH resources comprise multiple control channel elements; and sending at least one E-PDCCH corresponding to at least one user equipment UE in at least one control channel element of the preset multiplexing unit, and sending a DM RS corresponding to the at least one UE on the DM RS resources of the preset multiplexing unit, wherein the at least one resource block pair is a precoding resource block group PRG, and the number of resource blocks RBs in the PRG is decided by system bandwidth. ### Claim 2 (depends on 1) The method according to claim 1, wherein the sending the at least one E-PDCCH corresponding to the at least one user equipment UE in the at least one control channel element of the preset multiplexing unit comprises: when the at least one UE is multiple UEs, sending E-PDCCHs corresponding to the multiple UEs in at least two control channel elements in the multiple control channel elements according to time-division multiplexing, or frequency-division multiplexing, or time-frequency multiplexing. ### Claim 3 (depends on 1) The method according to claim 1, wherein the sending the DM RS corresponding to the at least one UE, comprises: for each UE in the at least one UE, sending the DM RS of the UE on all DM RS time-frequency resources corresponding to a DM RS port allocated to the UE in the preset multiplexing unit; or, sending, on the DM RS resources in the resource block pair carrying the E-PDCCH of the UE, the DM RS of the UE. ### Claim 4 (depends on 1) The method according to claim 1, further comprising: when the at least one UE is multiple UEs, allocating different DM RS ports to the multiple UEs, or allocating the same DM RS port to at least two UEs in the multiple UEs. ### Claim 5 (depends on 4) The method according to claim 4, wherein the sending, when different DM RS ports are allocated to the multiple UEs, the DM RS corresponding to the at least one UE, comprises: sending the DM RSs of the multiple UEs according to frequency-division multiplexing, code-division multiplexing or frequency-division and code-division multiplexing. ### Claim 6 (depends on 4) The method according to claim 4, further comprising: notifying the DM RS ports allocated to the multiple UEs to the multiple UEs through radio resource control RRC signaling; or, configuring a binding relationship between a DM RS port and an allocation pattern of the multiplexing unit in advance, wherein the binding relationship is also configured at a UE side. ### Claim 7 (depends on 1) The method according to claim 1, wherein the multiple control channel elements are obtained after the E-PDCCH resources are divided according to time-division multiplexing, or frequency-division multiplexing, or time-frequency multiplexing. ### Claim 8 (depends on 1) The method according to claim 1, wherein the multiplexing unit is formed by resources other than downlink control channel PDCCH resources, common reference signal CRS resources and channel-state information reference signal CSI RS resources in the at least one resource block pair. ### Claim 9 A method for receiving an enhanced downlink control channel, comprising: receiving a signal on a multiplexing unit, wherein the multiplexing unit comprises at least one resource block pair, the at least one resource block pair comprises enhanced downlink control channel E-PDCCH resources and demodulation reference DM RS resources, and the E-PDCCH resources comprise multiple control channel elements; performing channel estimation by using all DM RSs received on the multiplexing unit; and demodulating the signal received on the E-PDCCH resources in the multiplexing unit by using a result of the channel estimation, so as to obtain an E-PDCCH; wherein the at least one resource block pair is a precoding resource block group PRG, and the number of resource blocks RBs in the PRG is decided by system bandwidth. ### Claim 10 A base station, comprising: a configuration module, configured to preset a multiplexing unit, wherein the multiplexing unit comprises at least one resource block pair, the at least one resource block pair comprises enhanced downlink control channel E-PDCCH resources and demodulation reference DM RS resources, and the E-PDCCH resources comprise multiple control channel elements; and a sending module, configured to send at least one E-PDCCH corresponding to at least one user equipment UE in at least one control channel element of the preset multiplexing unit, and send a DM RS corresponding to the at least one UE on the DM RS resources of the preset multiplexing unit, wherein the at least one resource block pair is a precoding resource block group PRG, and the number of resource blocks RBs in the PRG is decided by system bandwidth. ### Claim 11 (depends on 10) The base station according to claim 10, wherein the sending module comprises: a first sending unit, configured to, when the at least one UE is multiple UEs, send E-PDCCHs corresponding to the multiple UEs in at least two control channel elements in the multiple control channel elements according to time-division multiplexing, or frequency-division multiplexing, or time-frequency multiplexing. ### Claim 12 (depends on 10) The base station according to claim 10, wherein the sending module comprises: a second sending unit, configured to, for each UE in the at least one UE, send the DM RS of the UE on all DM RS time-frequency resources corresponding to a DM RS port allocated to the UE in the preset multiplexing unit; or, send, on the DM RS resources in the resource block pair carrying the E-PDCCH of the UE, the DM RS of the UE. ### Claim 13 (depends on 10) The base station according to claim 10, wherein the configuration module is further configured to: when the at least one UE is multiple UEs, allocate different DM RS ports to the multiple UEs, or allocate the same DM RS port to at least two UEs in the multiple UEs. ### Claim 14 (depends on 13) The base station according to claim 13, wherein when the configuration module allocates different DM RS ports to the multiple UEs, the sending module comprises: a third sending unit, configured to send the DM RSs of the multiple UEs according to frequency-division multiplexing, code-division multiplexing or frequency-division and code-division multiplexing. ### Claim 15 (depends on 13) The base station according to claim 13, wherein the sending module is further configured to notify the DM RS ports allocated to the multiple UEs to the multiple UEs through radio resource control RRC signaling; or, the configuration module is further configured to configure a binding relationship between a DM RS port and an allocation pattern of the multiplexing unit in advance, wherein the binding relationship is also configured at a UE side. ### Claim 16 (depends on 10) The base station according to claim 10, wherein the configuration module is configured to obtain the multiple control channel elements by dividing the E-PDCCH resources according to time-division multiplexing, or frequency-division multiplexing, or time-frequency multiplexing. ### Claim 17 A user equipment UE, comprising: a receiving module, configured to receive a signal in a multiplexing unit, wherein the multiplexing unit comprises at least one resource block pair, the at least one resource block pair comprises enhanced downlink control channel E-PDCCH resources and demodulation reference DM RS resources, and the E-PDCCH resources comprise multiple control channel elements; a channel estimation module, configured to perform channel estimation by using all DM RSs received on the multiplexing unit; and a demodulation module, configured to demodulate the signal received on the E-PDCCH resources in the multiplexing unit by using a result of the channel estimation, so as to obtain an E-PDCCH, wherein the at least one resource block pair is a precoding resource block group PRG, and the number of resource blocks RBs in the PRG is decided by system bandwidth. ### Claim 18 A method for sending an enhanced downlink control channel, comprising: presetting a multiplexing unit, wherein the multiplexing unit comprises at least one resource block pair, the at least one resource block pair comprises enhanced downlink control channel E-PDCCH resources and demodulation reference DM RS resources, the E-PDCCH resources comprise multiple control channel elements, and an allocation pattern of the control channel elements in the multiplexing unit is bound to a DM RS port; and sending at least one E-PDCCH corresponding to at least one user equipment UE in at least one control channel element of the preset multiplexing unit, and sending a DM RS corresponding to the at least one UE on the DM RS resources of the preset multiplexing unit. ### Claim 19 (depends on 18) The method according to claim 18, wherein the sending the at least one E-PDCCH corresponding to the at least one user equipment UE in the at least one control channel element of the preset multiplexing unit comprises: when the at least one UE is multiple UEs, sending E-PDCCHs corresponding to the multiple UEs in at least two control channel elements in the multiple control channel elements according to time-division multiplexing, or frequency-division multiplexing, or time-frequency multiplexing. ### Claim 20 (depends on 18) The method according to claim 18, wherein the sending the DM RS corresponding to the at least one UE comprises: sending, on the DM RS resources in the resource block pair carrying the E-PDCCH of the UE, the DM RS of the UE. ### Claim 21 (depends on 18) The method according to claim 18, wherein the multiplexing unit is formed by resources other than downlink control channel PDCCH resources, common reference signal CRS resources and channel-state information reference signal CSI RS resources in the at least one resource block pair. ### Claim 22 A method for receiving an enhanced downlink control channel, comprising: receiving a signal on a multiplexing unit, wherein the multiplexing unit comprises at least one resource block pair, the at least one resource block pair comprises enhanced downlink control channel E-PDCCH resources and demodulation reference DM RS resources, the E-PDCCH resources comprise multiple control channel elements, and an allocation pattern of the control channel elements in the multiplexing unit is bound to a DM RS port; performing channel estimation by using all DM RSs received on the multiplexing unit; and demodulating the signal received on the E-PDCCH resources in the multiplexing unit by using a result of the channel estimation, so as to obtain an E-PDCCH. ### Claim 23 A base station, comprising: a configuration module, configured to preset a multiplexing unit, wherein the multiplexing unit comprises at least one resource block pair, the at least one resource block pair comprises enhanced downlink control channel E-PDCCH resources and demodulation reference DM RS resources, the E-PDCCH resources comprise multiple control channel elements, and an allocation pattern of the control channel elements in the multiplexing unit is bound to a DM RS port; and a sending module, configured to send at least one E-PDCCH corresponding to at least one user equipment UE in at least one control channel element of the preset multiplexing unit, and send a DM RS corresponding to the at least one UE on the DM RS resources of the preset multiplexing unit. ### Claim 24 (depends on 23) The base station according to claim 23, wherein the sending module comprises: a first sending unit, configured to, when the at least one UE is multiple UEs, send E-PDCCHs corresponding to the multiple UEs in at least two control channel elements in the multiple control channel elements according to time-division multiplexing, or frequency-division multiplexing, or time-frequency multiplexing. ### Claim 25 (depends on 23) The base station according to claim 23, wherein the sending module comprises: a second sending unit, configured to send, on the DM RS resources in the resource block pair carrying the E-PDCCH of the UE, the DM RS of the UE. ### Claim 26 A user equipment UE, comprising: a receiving module, configured to receive a signal on a multiplexing unit, wherein the multiplexing unit comprises at least one resource block pair, the at least one resource block pair comprises enhanced downlink control channel E-PDCCH resources and demodulation reference DM RS resources, the E-PDCCH resources comprise multiple control channel elements, and an allocation pattern of the control channel elements in the multiplexing unit is bound to a DM RS port; a channel estimation module, configured to perform channel estimation by using all DM RSs received on the multiplexing unit; and a demodulation module, configured to demodulate the signal received on the E-PDCCH resources in the multiplexing unit by using a result of the channel estimation, so as to obtain an E-PDCCH.