WO2013023621A1 - 传输增强下行控制信道的方法、设备和系统 - Google Patents
传输增强下行控制信道的方法、设备和系统 Download PDFInfo
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- WO2013023621A1 WO2013023621A1 PCT/CN2012/080355 CN2012080355W WO2013023621A1 WO 2013023621 A1 WO2013023621 A1 WO 2013023621A1 CN 2012080355 W CN2012080355 W CN 2012080355W WO 2013023621 A1 WO2013023621 A1 WO 2013023621A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2612—Arrangements for wireless medium access control, e.g. by allocating physical layer transmission capacity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0016—Time-frequency-code
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0026—Division using four or more dimensions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
Definitions
- the present invention claims to be submitted to the Chinese Patent Office on August 18, 2011, and the application number is 201110237806. 9. The invention is entitled “Method, Equipment and System for Transmission Enhanced Downlink Control Channel” The priority of the Chinese patent application, and the priority of the Chinese patent application filed on March 22, 2012, submitted to the China Patent Office, application number 201210079003. X, the invention titled “Method, Equipment and System for Transmission Enhanced Downlink Control Channel” The entire contents of which are incorporated herein by reference. TECHNICAL FIELD The present invention relates to the field of communications, and in particular, to a method, device, and system for transmitting an enhanced downlink control channel.
- the downlink multiple access method is usually adopted.
- OFDMA Orthogonal Frequency Division Multiple Access
- the downlink resources of the system are divided into OFDM (Orthogonal Frequency Division Multiple) symbols in terms of time, and are divided into subcarriers in terms of frequency.
- a normal downlink subframe includes two slots, each slot has 7 OFDM symbols, and a normal downlink subframe contains 14 or 12 OFDM symbols.
- the size of the RB Resource Block
- one RB contains 12 subcarriers in the frequency domain, and is half a subframe duration (one time slot) in the time domain, that is, contains 7 or 6 OFDM symbols.
- the normal CP (Cyclic Prefix) length symbol is 7 OFDM symbols
- the extended cyclic prefix length symbol is 6 OFDM symbols).
- a certain subcarrier within an OFDM symbol is called RE (Resource Element), so one RB contains 84 or 72 REs.
- a pair of RBs of two slots is called a resource block pair, that is, an RB pair.
- control channels and traffic channels.
- service data or control information
- the fundamental purpose of communication is to transmit service data, and the role of the control channel is to assist in the transmission of service data. Therefore, the design of a communication system preferably minimizes the resources occupied by the control channel.
- resources used for service data transmission in an OFDMA system are flexibly allocated, that is, to a certain For the UE (User Equipment), the number of RBs occupied by the service data sent to the UE in each subframe, and the starting positions of all the RBs in the entire system are changed, so the service is sent.
- the data is given to the UE, it is also necessary to tell the UE which RBs it should receive to receive its service data.
- the modulation and coding mode adopted by the service data sent to the UE by each subframe is also changed, and the UE needs to be told.
- Information such as RA (Resource Allocation, Resource Allocation) and MC (Modulation and Coding Scheme) is used to assist or control the transmission of service data. Therefore, it is called control information and is transmitted on the control channel.
- RA Resource Allocation
- MC Modulation and Coding Scheme
- the control channel in one subframe can occupy the first 3 OFDM symbols of all RBs of the entire system.
- a PDCCH Physical Downlink Control CHannel
- a complete PDCCH consists of one or several CCEs (Control Channel Elements), and one CCE consists of 9 REGs ( Resource Element Group, resource element group), one REG occupies 4 REs.
- one PDCCH can be composed of 1, 2, 4 or 8 CCEs and is approximately evenly distributed over the time-frequency domain.
- the demodulation of the PDCCH is based on the CRS (Common Reference Signal).
- the PDCCH channel may again be referred to as an E-PDCCH (Enhanced PDCCH).
- some RB pairs are allocated as areas for E-PDCCH control information transmission in the area of the PDSCH (Physical Downlink Shared Channel), where the granularity is in units of one RB pair.
- the basic unit of one PDCCH is CCE, and one RB pair may be equivalent to multiple CCE resources. Therefore, the basic unit granularity of one RB pair as the E-PDCCH is too large, which causes waste of resources.
- embodiments of the present invention provide a method, device, and system for transmitting an enhanced downlink control channel.
- a method for transmitting an enhanced downlink control channel includes:
- the multiplexing unit includes at least one resource block pair, and the at least one resource block pair includes an enhanced downlink control channel E-PDCCH resource and a demodulation pilot DM RS resource, where the E-PDCCH resource Including a plurality of control channel units;
- the at least one resource block pair is a pre-coded resource block group PRG, and the number of resource block RBs in the PRG is determined by a system bandwidth.
- a method for receiving an enhanced downlink control channel includes:
- the multiplexing unit includes at least one resource block pair, and the at least one resource block pair includes an enhanced downlink control channel E-PDCCH resource and a demodulation pilot DM RS resource, the E-PDCCH
- the resource includes a plurality of control channel elements
- the at least one resource block pair is a pre-coded resource block group PRG, and the number of resource block RBs in the PRG is determined by a system bandwidth.
- a base station includes:
- a configuration module configured to preset a multiplexing unit, where the multiplexing unit includes at least one resource block pair, and the at least one resource block pair includes an enhanced downlink control channel E-PDCCH resource and a demodulation pilot DM RS resource, where
- the E-PDCCH resource includes multiple control channel units;
- a sending module configured to send, by using at least one E-PDCCH corresponding to the at least one user equipment UE, in the at least one control channel unit of the preset multiplexing unit, and the DM RS resource in the preset multiplexing unit Transmitting, by the DM RS corresponding to the at least one UE;
- the at least one resource block pair is a pre-coded resource block group PRG, and the number of resource block RBs in the PRG is determined by a system bandwidth.
- a user equipment UE includes:
- a receiving module configured to receive a signal on a multiplexing unit, where the multiplexing unit includes at least one resource block pair, and the at least one resource block pair includes an enhanced downlink control channel E-PDCCH resource and a demodulation pilot DM RS resource, where
- the E-PDCCH resource includes a plurality of control channel units;
- a channel estimation module configured to perform channel estimation by using all DM RSs received on the multiplexing unit
- a demodulation module configured to demodulate the E-PDCCH resource in the multiplexing unit by using the result of the channel estimation Signal, obtain E-PDCCH
- the at least one resource block pair is a pre-coded resource block group PRG, and the resource block RB in the PRG The number is determined by the system bandwidth.
- a system for transmitting an enhanced downlink control channel includes the base station and the user equipment UE.
- a method for transmitting an enhanced downlink control channel includes:
- the multiplexing unit includes at least one resource block pair, and the at least one resource block pair includes an enhanced downlink control channel E-PDCCH resource and a demodulation pilot DM RS resource, where the E-PDCCH resource Include a plurality of control channel units; wherein, an allocation pattern of the control channel unit in the multiplexing unit is bound to a DM RS port;
- a method for receiving an enhanced downlink control channel includes:
- the multiplexing unit includes at least one resource block pair, and the at least one resource block pair includes an enhanced downlink control channel E-PDCCH resource and a demodulation pilot DM RS resource, the E-PDCCH
- the resource includes a plurality of control channel units; wherein, the allocation pattern of the control channel unit in the multiplexing unit is bound to the DM RS port;
- a base station the base station includes:
- a configuration module configured to preset a multiplexing unit, where the multiplexing unit includes at least one resource block pair, and the at least one resource block pair includes an enhanced downlink control channel E-PDCCH resource and a demodulation pilot DM RS resource, where
- the E-PDCCH resource includes a plurality of control channel units; wherein, the allocation pattern of the control channel unit in the multiplexing unit is bound to the DM RS port;
- a sending module configured to send, by using at least one E-PDCCH corresponding to the at least one user equipment UE, in the at least one control channel unit of the preset multiplexing unit, and the DM RS resource in the preset multiplexing unit Sending, on the DM RS, the DM RS corresponding to the at least one UE.
- a user equipment UE where the UE includes:
- a receiving module configured to receive a signal on a multiplexing unit, where the multiplexing unit includes at least one resource block pair, and the at least one resource block pair includes an enhanced downlink control channel E-PDCCH resource and a demodulation pilot DM RS resource, where
- the E-PDCCH resource includes a plurality of control channel units; wherein, the control channel unit in the multiplexing unit Binding pattern and DM RS port binding;
- a channel estimation module configured to perform channel estimation by using all DM RSs received on the multiplexing unit
- a demodulation module configured to demodulate the E-PDCCH resource in the multiplexing unit by using the result of the channel estimation Signal, get E-PDCCH.
- a method for transmitting an enhanced downlink control channel includes:
- Determining at least two physical resource block pairs in a physical resource block pair group the at least two physical resource block pairs being used for transmitting an enhanced downlink control channel E-PDCCH and demodulating the E-PDCCH Pilot
- the E-PDCCH and DMRS on the at least two physical resource block pairs are precoded using the same precoding matrix.
- a method for receiving an enhanced downlink control channel includes:
- the enhanced downlink control channel E-PDCCH transmitted by the user equipment in at least two physical resource blocks of the pair of physical resource block pairs to the receiving base station and the demodulation pilot DRMS for demodulating the E-PDCCH;
- the user equipment pre-codes the E-PDCCH and the DRMS of the at least two physical resource block pairs according to the base station by using the same precoding matrix, and performs channel estimation on the DMRSs of the at least two physical resource block pairs;
- the user equipment detects the E-PDCCH at a predetermined position of the at least two physical resource block pairs according to a channel estimation result.
- a base station includes:
- a resource determining unit configured to determine, in one physical resource block pair group, at least two physical resource block pairs, where the at least two physical resource block pairs are used to send an enhanced downlink control channel E-PDCCH and used to demodulate the a pilot DMRS for demodulation of the E-PDCCH;
- a precoding unit configured to precode the E-PDCCH and the DMRS on the at least two physical resource block pairs determined by the resource determining unit by using the same precoding matrix.
- a user equipment includes:
- a receiving unit configured to: at least two physical resource blocks in a physical resource block pair group, an enhanced downlink control channel E-PDCCH transmitted by the receiving base station, and a demodulation pilot DRMS for demodulating the E-PDCCH;
- a channel estimation unit configured to precode the E-PDCCH and the DRMS of the at least two physical resource block pairs according to the base station by using the same precoding matrix, and receive the at least two physicals received by the receiving unit Channel estimation of the DMRS of the resource block pair;
- a detecting unit configured to detect the E-PDCCH at a predetermined position of the at least two physical resource block pairs according to a channel estimation result obtained by the channel estimation unit.
- the method, device, and system for transmitting an enhanced downlink control channel by dividing a plurality of control channel units for a multiplexing unit, and transmitting at least one E-PDCCH corresponding to at least one UE, for each UE,
- the granularity of the enhanced downlink control channel is the control channel unit. Compared with the granularity of one RB pair in the prior art, the granularity is reduced, the resources are saved, the downlink control channel is enhanced, and more control channels can be provided for the UE.
- FIG. 1 is a flowchart of a method for transmitting an enhanced downlink control channel according to an embodiment of the present invention
- FIG. 2 is a flowchart of a method for receiving an enhanced downlink control channel according to an embodiment of the present invention
- FIG. 3 is another flowchart of a method for transmitting an enhanced downlink control channel according to an embodiment of the present invention
- FIG. 4 is a schematic diagram of dividing a control channel unit in a multiplexing unit according to an embodiment of the present invention
- FIG. 5 is a schematic diagram of an RB in-band DM RS resource under normal CP length
- FIG. 6 is another schematic diagram of an RB in-line DM RS resource for a normal CP length
- FIG. 7 is a schematic diagram of time division multiplexing of two UEs according to an embodiment of the present invention.
- FIG. 8 is a schematic diagram of two UE frequency division multiplexing according to an embodiment of the present invention.
- 9a and 9b are schematic diagrams of time-frequency multiplexing of two UEs according to an embodiment of the present invention.
- FIG. 10a, FIG. 10b and FIG. 10c are schematic diagrams of time-frequency multiplexing of four UEs according to an embodiment of the present invention
- FIG. 10d is a schematic diagram of an allocation pattern of control channel elements in a multiplexing unit
- 10e is a schematic diagram of a binding relationship between an allocation pattern of a control channel unit and a DMRS port in a multiplexing unit;
- FIG. 10f is a schematic diagram showing a binding relationship between an allocation pattern of a control channel unit and a DMRS port in another multiplexing unit;
- FIG. 11 is a structural diagram of a base station according to an embodiment of the present invention.
- FIG. 12 is a structural diagram of a UE according to an embodiment of the present invention
- FIG. 13 is a flowchart of another method for transmitting an enhanced downlink control channel according to an embodiment of the present invention
- FIG. 14 is a structural diagram of a base station according to an embodiment of the present invention
- FIG. 15 is a structural diagram of a UE according to an embodiment of the present invention.
- FIG. 16 is a structural diagram of a system for transmitting an enhanced downlink control channel according to an embodiment of the present invention.
- DETAILED DESCRIPTION OF THE EMBODIMENTS In order to make the objects, technical solutions, and advantages of the present invention more comprehensible, the embodiments of the present invention will be further described in detail with reference to the accompanying drawings.
- an embodiment of the present invention provides a method for transmitting an enhanced downlink control channel, including: 101: Presetting a multiplexing unit, the multiplexing unit includes at least one resource block pair, and the at least one resource The block includes an E-PDCCH resource and a DM RS resource, where the E-PDCCH resource includes a plurality of control channel elements;
- the at least one resource block pair is a PRG (Precoding Resource Block Groups), and the number of resource blocks RBs in the PRG is determined by a system bandwidth.
- PRG Precoding Resource Block Groups
- the number of the multiple control channel units in the multiplex unit may be equal to or different from the number of the UEs, which is not limited in this embodiment of the present invention.
- the E-PDCCH resources in the multiplexing unit are divided into four control channel units, and are respectively multiplexed with four UEs of UE1, UE2, UE3, and UE4, and each UE is allocated one control channel unit; or UE2 and UE6 share a total of 2 UEs for multiplexing, and each UE is allocated 2 control channel units.
- the execution body of the sending method may be a base station such as e B (evolutional Node B) or the like.
- a further embodiment of the present invention provides a method for receiving an enhanced downlink control channel, including: 201: receiving a signal on a multiplexing unit, the multiplexing unit includes at least one resource block pair, and the at least One resource block pair includes an E-PDCCH resource and a DM RS resource, and the E-PDCCH resource includes a plurality of control channel units;
- the at least one resource block pair is a PRG, and the number of resource blocks RBs in the PRG is determined by a system bandwidth.
- the execution body of the receiving method may specifically be a UE.
- each UE has its own E-PDCCH and its own DM RS.
- the E-PDCCH is transmitted on the E-PDCCH resource
- the DM RS is transmitted on the DM RS resource.
- the method for transmitting an enhanced downlink control channel and the method for receiving an enhanced downlink control channel according to an embodiment of the present invention, by dividing a plurality of control channel units for a multiplexing unit, and transmitting at least one E-PDCCH corresponding to at least one UE, For each UE, the granularity of the enhanced downlink control channel is a control channel unit. Compared with the granularity of one RB pair in the prior art, the granularity is reduced, resources are saved, and the downlink control channel is enhanced, which can provide more The control channel is used by the UE. Referring to FIG.
- another embodiment of the present invention provides a method for transmitting an enhanced downlink control channel, including: 301: A base station presets a multiplexing unit, where the multiplexing unit divides PCCCH resources by at least one resource block RB pair.
- the CRS resource is composed of resources other than the CSI RS (Channel-State Information Reference Signal) resource, and the multiplex unit is divided into an E-PDCCH resource and a DM RS resource, and the E-PDCCH resource is time-multiplexed. It is divided into multiple control channel units by using, or frequency division multiplexing, or time-frequency division multiplexing.
- the multiplexing unit includes at least one RB pair, and includes two RB pairs, three RB pairs, or four RB pairs, and the like, which is not specifically limited in this embodiment of the present invention.
- the result of the multiplexing unit division may be previously configured and stored on the base station side in the form of a multiplexing pattern.
- a schematic diagram of dividing a plurality of control channel units in a multiplexing unit does not show a DM RS resource, and only a plurality of control channel units in an E-PDCCH resource are taken as an example for description.
- the two RB pairs are used as one multiplexing unit, and each RB pair includes an E-PDCCH resource and a DM RS resource, where the E-PDCCH resource is divided into four control channel units for multiplexing by two UEs.
- UE1 occupies 2 control channel units in RB pair 1
- UE2 occupies 2 control channel units in RB pair 1 and also takes 2 in RB pair 2 Control channel unit.
- the E-PDCCH resource refers to a resource other than the DM RS resource, and the number of REs included in one RB in-band DM RS resource is not fixed. Therefore, the number of REs included in the E-PDCCH resource is also not The number is fixed by the number of CRS ports configured by the base station and the number of REs included in the DM RS resource.
- the CRS port refers to a logical port configured by the base station for transmitting the CRS, and the CRS configured by the base station.
- the number of ports can be 1, 2, or 4.
- the details are not limited.
- the DM RS resource can contain 12 REs or 24 REs, which are not limited.
- the number of REs included in the DM RS resource may be determined according to the number of DM RS ports.
- the DM RS port refers to the logical port configured by the base station to transmit the DM RS, which can be 2 or 4. For example, if there are two DM RS ports, the DM RS resource contains 12 REs and the DM RS ports have four.
- the DM RS resources contain 24 REs.
- Table 1 shows the number of REs that can transmit data in one RB pair configured with different CRS and DMRS port numbers.
- the first 3 OFDM symbols of a normal subframe are PDCCH
- there are a total of 12 X 14 168 REs in one RB pair, where PDCCH is occupied.
- the DM RS occupies 12 REs
- the CRS outside the PDCCH region occupies 16 REs.
- the dividing the E-PDCCH resource according to the time division multiplexing means that the plurality of divided control channel units occupy the same carrier in the frequency domain, for example, all of the 12 carriers are included, but occupy different times in the time domain. OFDM symbol.
- the dividing the E-PDCCH resource according to the frequency division multiplexing means that the plurality of divided control channel units all contain the same OFDM symbol in the time domain, but occupy different carriers in the frequency domain, such as before a control channel unit is occupied. 6 carriers, another control channel unit occupies the last 6 carriers, and so on.
- the dividing the E-PDCCH resource according to the time-frequency division multiplexing means that the plurality of divided control channel units occupy different carriers in the frequency domain, in the time domain.
- the occupied OFDM symbols are also different.
- the base station sends, in the at least one control channel unit of the multiplexing unit, at least one E-PDCCH corresponding to the at least one UE.
- the at least one UE may be one or multiple.
- the base station sends two E-PDCCHs corresponding to one UE, one of which is an E-PDCCH for uplink scheduling, and the other is an E-PDCCH for downlink scheduling.
- the base station sends three E-PDCCHs, which respectively correspond to three UEs; or, the base station sends three E-PDCCHs, two of which correspond to UE1 and the other to UE2.
- time division multiplexing or frequency division multiplexing, or at least two of the plurality of control channel units in the multiplexing unit may be used.
- the E-PDCCH of the multiple UEs is transmitted by time-frequency division multiplexing, which is not specifically limited in this embodiment of the present invention.
- the base station For each of the at least one UE, the base station sends the DM RS of the UE on all DM RS time-frequency resources allocated to the DM RS port of the UE in the multiplexing unit;
- the base station may allocate a DM RS port to the UE in advance, and when transmitting the DM RS of a certain UE, send the DM RS of the UE on all DM RS time-frequency resources corresponding to the DM RS port allocated by the UE.
- each of the UEs transmits the DM RS of the UE according to the method.
- the base station allocates the DM RS port to the port 7 and the port 8 for the UE1 and the UE2, and then sends the DM RS of the UE1 on all the DM RS time-frequency resources of the port 7, and sends the UE2 on all the DM RS time-frequency resources of the port 8.
- DM RS DM RS.
- the E-PDCCH of one UE may be carried in one RB pair in the multiplexing unit, or may be carried in multiple RB pairs in the multiplexing unit, or even in all RB pairs, the base station
- the DM RS of the UE may be transmitted on the DM RS resource in the RB pair carrying the E-PDCCH of the UE, and the DM RS of the UE is not transmitted in the RB pair that does not carry the E-PDCCH of the UE.
- the multiple DM RS ports may be allocated to the multiple UEs, or the same ones may be allocated to at least two of the multiple UEs.
- DM RS port when the at least one UE is a plurality of UEs, the multiple DM RS ports may be allocated to the multiple UEs, or the same ones may be allocated to at least two of the multiple UEs.
- each UE that allocates the same DM RS port may use a different precoding matrix, but the DM RS port of each UE may Interference occurs with each other, and channel estimation is less effective. Or, you can also assign these to the same DM RS port.
- the UE uses the same precoding matrix for precoding, but cannot use each of the UEs to perform precoding using the optimal precoding matrix, and the optimal beamforming gain cannot be obtained (beamforming gain, therefore, preferably, Multiple UEs are assigned different DM RS ports.
- the DM RS port is assigned to port 7 (port 7) for UE1, and the DM RS port is assigned to port 8 (port 8) for UE2.
- different UEs use different DMRS ports, so that when the E-PDCCH is sent to each UE, the base station pre-codes each user with its optimal precoding matrix.
- FIG. 5 for a schematic diagram of an RB in-line DM RS for a normal CP length. It shows the location of DM RS port 7 and port 8 in the time-frequency domain.
- the RB pair contains DM RS resources with 12 REs, and supports DM RS, DM RS port 7 and port 8 of two ports.
- FIG 6, another schematic diagram of an RB in-line DM RS for a normal CP length.
- the RB pair contains DM RS resources with 24 REs, and can support up to 8 ports of DM RS. Where ports 7, 8, 11 and 13 are transmitted on the RE of the DM RS labeled as horizontal stripes, and ports 9, 10, 12 and 14 are transmitted on the RE of the DM RS labeled as vertical stripes.
- the spreading sequence used by the base station in the precoding process can be as shown in Table 2, and Table 2 is the spreading sequence under the normal CP.
- Table 2 is the spreading sequence under the normal CP.
- the spreading code length is 4, and the spreading code is [+1, -1, +1, -1], and then the OFDM symbol in the 5th time domain of the even slot.
- the even slot is at the DM RS position in the frequency domain of the OFDM symbol in the sixth time domain.
- the plurality of divided control channel units may be concentrated or alternately distributed.
- the following is a specific example.
- FIG. 7 is a schematic diagram of time division multiplexing one RB pair for two UEs.
- the multiplexing unit includes one RB pair, and multiplexes two UEs, UE1 and UE2, four CRS ports, and the DM RS resource includes 12 REs.
- Dividing 2 control channel elements in the time domain wherein the first control channel unit occupies 4th, 6th, 8th, 10th, 12th and 14th OFDM symbols in the time domain direction, and the second control channel unit occupies 5th in the time domain direction , 7, 9, 11 and 13 OFDM symbols, belonging to an alternating distribution. Both control channel units occupy 12 carriers in the frequency domain and have the same carrier resources.
- the first control channel unit is allocated to the UE1, and the second control channel unit is allocated to the UE2 to perform enhancement of the PDCCH. Then, the E-PDCCH signals of the UE1 and the UE2 are alternately transmitted on different OFDM symbols. Further, the DM RS ports of UE1 and UE2 can be configured as different ports, such as port 7 and port 8, respectively.
- FIG 8 is a schematic diagram of frequency division multiplexing of one RB pair for two UEs.
- the multiplexing unit includes one RB pair, and multiplexes two UEs, UE1 and UE2, four CRS ports, and the DM RS resource includes 12 REs.
- the two control channel units are divided in the frequency domain, wherein the first control channel unit occupies the last six carriers in the frequency domain direction, and the second control channel unit occupies the first six carriers in the frequency domain direction, and belongs to a centralized distribution. Both control channel elements occupy 11 identical OFDM symbols in the time domain, with the same time domain resources.
- the first control channel unit is allocated to the UE1, the second control channel unit is allocated to the UE2, and the PDCCH is enhanced, and the E-PDCCH signals of the UE1 and the UE2 are respectively transmitted on different carriers.
- the DM RS ports of UE1 and UE2 can be configured as different ports, such as port 7 and port 8, respectively.
- the first control channel unit may be allocated to the UE2, and the first six frequency domain resources are occupied, and the second control channel unit is allocated to the UE1, and the first six frequency domain resources are occupied. .
- FIG. 9a and FIG. 9b a schematic diagram of frequency division multiplexing one RB pair for two UEs.
- the difference from the above two examples is that two control channel units in one RB pair occupy different resources in the time domain, and the resources occupied in the frequency domain are also different and belong to alternate distribution.
- the two UEs are alternately allocated according to the order of UE1 and UE2 from top to bottom. That is, in the 12 carriers of each column, except for the pilot resources including the CRS resources and the DM RS resources, the remaining carrier resources are alternately occupied by the order of the UE1 and the UE2.
- FIG. 9a in the vertical frequency domain resource column corresponding to each OFDM symbol, the two UEs are alternately allocated according to the order of UE1 and UE2 from top to bottom. That is, in the 12 carriers of each column, except for the pilot resources including the CRS resources and the DM RS resources, the remaining carrier resources are alternately occupied by the order of the UE1 and the UE2.
- the frequency domain is from top to bottom, and then the time domain is from left to right, and the UE1 is sequentially allocated after UE1, that is, starting from the 4th OFDM symbol in the figure, according to the 4th to the The order of 14 OFDM symbols, and the resources other than the pilot resources are alternately allocated to UE1 and UE2 in the frequency domain resource column corresponding to each OFDM symbol in order from the top to the bottom.
- the fourth example is a schematic diagram of frequency division multiplexing of 1 RB pair for 4 UEs.
- the difference from the above three examples is that 4 UEs are multiplexed, and the DM RS includes 24 REs and 4 ports, and the 4 ports are respectively allocated to 4 UEs, such as ports allocated to UE1, UE2, UE3, and UE4. They are port 7, port 8, port 9, and port 10.
- FIG. 10a similar to the first example, for time division multiplexing, four control channel units are divided in the time domain, and are alternately allocated according to the order of UE1, UE2, UE3, and UE4, where the first control is allocated to UE1.
- the channel unit occupies the 4th, 8th, and 12th OFDM symbols in the time domain direction
- the second control channel unit allocated to the UE2 occupies the 5th, 9th, and 13th OFDM symbols in the time domain direction, and is allocated to the third control channel unit of the UE3.
- the fourth control channel unit allocated to the UE4 occupy the 7th and 11th OFDM symbols in the time domain direction, which are alternately distributed.
- the frequency domain resource column in which each OFDM symbol is located is divided into two parts, which are respectively allocated to two UEs, and are allocated to four UEs in groups of two OFDM symbols, specifically, starting from the fourth OFDM symbol, according to From the order of the 4th to 14th OFDM symbols, each of the two adjacent frequency domain resource columns respectively assigns the first column to UE1 and UE2, and the second column is assigned to the order of UE3 and UE4, and then alternates distribution.
- FIG 10c similar to the multiplexing in Figure 9b, it is time-frequency division multiplexing.
- the time domain from left to right and from UE1, UE2, UE3 to UE4, starting from the 4th OFDM symbol in the figure, according to the 4th to the
- the order of 14 OFDM symbols, and the resources other than the pilot resources are alternately allocated to UE1, UE2, UE3, and UE4 in the frequency domain resource column corresponding to each OFDM symbol in the order of the top-to-bottom carrier.
- multiple RB pairs may be used as one multiplexing unit, and DM RS resources in each RB pair are included on all DM RS resources in the multiplexing unit.
- the pilot signals of the multiple UEs are transmitted, so that channel estimation can be performed by using the DM RSs on all RB pairs in the multiplexing unit, and the channel estimation performance is improved compared with channel estimation using only one RB pair.
- the multiplexing unit includes two RB pairs, and each RB is internally divided into four control channel units and allocated to two UEs, each The UEs each occupy 2 control channel units, and the DM RS signals of UE1 and UE2 are transmitted on the DM RS resources of RB pair 1 and RB pair 2.
- different DM RS ports may be used to separately transmit DM RS signals of UE1 and UE2, for example, UE1 uses DM RS port 7, UE2 uses DM RS port 8, and the like.
- the number of RB pairs in the PRG is determined by the system bandwidth. See Table 3 for the correspondence between system bandwidth and precoding granularity. table 3
- the PRG size indicates that, for a UE, the same precoding matrix is precoded in several RB pairs under the corresponding system bandwidth. For example, if the system bandwidth is 25 RBs, then the PRG is 2 RB pairs. In the 25 RBs of the system bandwidth, each of the two RB pairs is precoded using the same precoding matrix, so that the PRG can be Two RB pairs are multiplexed as one multiplexing unit.
- the multiple control channel units divided in the PRG are multiplexed by multiple UEs, and different UEs occupy different control channel units.
- the DM RS signal of the UE may be sent on all RB pairs in the PRG as long as the UE transmits the E-PDCCH in the PRG, or only the UE is carried in the PRG.
- the DM RS signal of the UE is transmitted on the RB pair of the E-PDCCH.
- a plurality of PRBs can perform joint channel estimation, thereby improving the performance of channel estimation.
- the number of control channel units divided by one multiplexing unit, and the information of the control channel unit and the DM RS port mapped by the UE may be notified to the UE by the base station, and the signaling notification may be RRC (Radio Resource Control) signaling semi-static notification; or the allocation pattern of the control channel unit in the multiplexing unit and the DM RS port may be bound, and the binding relationship is allocated and configured in the base station and the UE. side. For example, taking FIG. 7 as an example, using the allocation scheme of the pattern, and binding the UE1 to the DM RS port 7 and binding the UE2 to the DM RS port 8, the base station is not required to separately notify the UE.
- RRC Radio Resource Control
- the aggregation level of one E-PDCCH may be 1, 2, 4, or 8, that is, one E-PDCCH may be transmitted by 1, 2, 4, or 8 control channel units.
- the E-PDCCH can be classified into a Localized E-PDCCH and a Distributed E-PDCCH.
- the distributed E-PDCCH may be sent by using transmit diversity; the centralized E-PDCCH may be sent by using precoding or beam attachment. give away.
- the centralized E-PDCCH is further discussed.
- Figure 10d shows an allocation pattern of control channel elements within a multiplexing unit. Only one RB pair in the multiplexing unit is shown in Figure 10d.
- Each of the RB pairs in the multiplexing unit may include a plurality of control channel elements, e.g., control channel elements eCCE0 ⁇ eCCE3 in the allocation pattern of the control channel elements shown in Figure 10d.
- 12 subcarriers in one RB pair are divided into 4 sub-carriers, and one portion occupies 3 subcarriers.
- Each control channel unit occupies 3 subcarriers and occupies k (k is an integer) OFDM symbols in the time domain.
- the present embodiment is not limited to being divided into four control channel units in one RB pair, and may be divided into multiple control channel units in one RB pair.
- the allocation pattern of the control channel unit and the DM RS port binding relationship in the multiplexing unit may be: eCCEO is bound to DMRS port 7, eCCEl is bound to DMRS port 8, eCCE2 is bound to DMRS port 9, eCCE3 and DMRS port 10 bindings. If the aggregation level of the E-PDCCH to be transmitted is 1, then the first E-PDCCH may be sent at the eCCEO and the first E-PDCCH corresponding to the DMRS port 7 in the allocation pattern of the control channel unit shown in FIG. 10d. DMRS; transmitting a second E-PDCCH at eCCEl, transmitting a DMRS corresponding to the second E-PDCCH at DMRS port 8; and so on.
- the aggregation level of one E-PDCCH can be greater than 1, for example, the aggregation level can be 2.
- the allocation pattern of the control channel unit in the multiplexing unit and the DM RS port binding relationship may be: eCCEO and eCCEl are bound to the DMRS port x, and eCCE2 and eCCE3 are bound to the DMRS port y.
- the aggregation level of the E-PDCCH to be transmitted is 2
- the first E-PDCCH may be transmitted in eCCEO and eCCEl, and the first E may be sent in DMRS port x in the allocation pattern of the control channel unit shown in FIG.
- DMRS corresponding to the PDCCH transmitting the second E-PDCCH in eCCE2 and eCCE3, and transmitting the DMRS corresponding to the second E-PDCCH in the DMRS port y.
- the DMRS ports x, y can be any one of the DMRS ports 7, 8, 9, and 10, and the port x and the port y can be different.
- FIG. 10e illustrates a binding pattern of a control channel unit and a DMRS port binding relationship in a multiplexing unit.
- an RB pair includes four control channel elements, that is, the RB pair n includes the control channel elements eCCE0 to eCCE3, and the S ⁇ RB pair n+1 includes the control channel elements eCCE4 to eCCE7. If the aggregation level of one E-PDDCH is greater than 1, for example, the aggregation level is 4, then it may be necessary to occupy multiple RB pairs.
- the allocation pattern of the control channel unit and the DM RS port binding relationship in the multiplexing unit may be: eCCEO is bound to DMRS port 7, eCCEl is bound to DMRS port 8, and eCCE2 ⁇ eCCE5 is bound to DMRS port x.
- the eCCE6 is bound to the DMRS port 9, and the eCCE7 is bound to the DMRS port 10.
- eCCE0, eCCEl, eCCE6 And eCCE7 can be used to send an E-PDCCH with an aggregation level of 1, and send a DMRS on the corresponding DMRS port 7-10.
- eCCE2 to eCCE5 can be used to send an E-PDCCH with an aggregation level of 4, and send a DMRS on the corresponding DMRS port X.
- the DMRS port x can be a DMRS port 7, 8, 9, or 10.
- the E-PDDCH of the UE3 may be sent in the RB pair n and
- an E-PDCCH of aggregation level 1 of UE1 is sent on the eCCEO of RB pair n, UE1 uses the DMRS received on DMRS port 7 for channel estimation; and an E-PDCCH of aggregation level 1 of UE2 is RB transmits on eCCEl of n, UE2 uses DMRS received on DMRS port 8 for channel estimation; one E-PDCCH of aggregation level 1 of UE4 is sent on eCCE6 of RB pair n+1, and UE4 uses DMRS port 9
- the received DMRS performs channel estimation; one E-PDCCH of aggregation level 1 of UE5 is transmitted on eCCE7 of RB pair n+1, and UE5 performs channel estimation by using DMRS received on DMRS port 10.
- UE3 For UE3, if the DMRS port bound to eCCE2 ⁇ eCCE5 is 7 or 8, UE3 needs to use the DMRS received on DMRS port 7 or 8 for channel estimation, but the DMRS port used by UE3 will be in the nth RB pair. Conflict with the DMRS port of UE1 or UE2. If the DMRS port bound to eCCE2 ⁇ eCCE5 is 9 or 10, the DMRS port used by UE3 will collide with the DMRS port of UE4 or UE5 in the n+1th RB pair.
- one method is as follows: If the E-PDCCH of the aggregation level 4 of the UE3 uses the port 9, the E-PDCCH with the aggregation level of 1 of other users is not carried on the eCCE6 of the RB pair n+1.
- FIG. 10f shows a binding pattern of a control channel unit and a DMRS port binding relationship in another multiplexing unit.
- the binding relationship shown in Figure 10f is different from the binding relationship shown in Figure 10e.
- eCCE2 ⁇ eCCE3 are bound to DMRS port 9 or 10
- eCCE4 ⁇ eCCE5 are bound to DMRS port 7 or 8.
- the E-PDDCH of the UE3 may be transmitted on eCCE2 to eCCE5 of the RB pair n and the RB pair n+1.
- the DMRS corresponding to eCCE2 to eCCE3 is transmitted using DMRS port 9 or 10
- the DMRS corresponding to eCCE4 to eCCE5 is transmitted using DMRS port 7 or 8.
- UE3 does not have a DMRS port collision with other UEs in RB pairs n and n+1.
- the method for the enhanced downlink control channel can be received according to the method shown in FIG. 2, and the specific process is the same as that in the foregoing embodiment, and details are not described herein again.
- the foregoing method for transmitting an enhanced downlink control channel by dividing a plurality of control channel units for a multiplexing unit, and transmitting at least one E-PDCCH of at least one UE, for each UE, enhancing a downlink control channel
- the granularity is the control channel unit, which reduces the granularity compared to the granularity of an RB pair in the prior art.
- the resource is saved, the enhancement of the downlink control channel is implemented, and more control channels can be provided for the UE.
- the multiplexing unit may divide multiple control channel units in time division multiplexing, frequency division multiplexing, or time division frequency division multiplexing, and multiple control channel units may be distributed or alternately distributed, and have multiple implementation modes, and flexible application. Convenience.
- the above embodiment is a scenario in which the E-PDCCH of one UE is transmitted through only one layer.
- the embodiment of the present invention can also be applied to a scenario in which the E-PDCCH of one UE is transmitted through multiple layers. For example, if UE1 is a two-layer transmission, UE1 needs two pilots of the DM RS port to separately estimate the two-layer channel, and then UE1 can be allocated DM RS port 7 and DM RS port 8, if there are other UEs to be combined with UE1. Use, you can use different DM RS ports for other UEs.
- another embodiment of the present invention provides a base station, including:
- the configuration module 1101 is configured to preset a multiplexing unit, where the multiplexing unit includes at least one resource block pair, and the at least one resource block pair includes an enhanced downlink control channel E-PDCCH resource and a demodulation pilot DM RS resource, E-
- the PDCCH resource includes a plurality of control channel units;
- the sending module 1102 is configured to send at least one E-PDCCH corresponding to the at least one UE in the at least one control channel unit of the preset multiplexing unit, and send the DM RS resource on the preset multiplexing unit.
- a DM RS corresponding to at least one UE;
- the at least one resource block pair is a PRG, and the number of resource blocks RBs in the PRG is determined by a system bandwidth.
- the sending module 1102 can include:
- a first sending unit configured to perform time division multiplexing, or frequency division multiplexing, or time-frequency division in at least two control channel units of the multiple control channel units when the at least one UE is multiple UEs
- the E-PDCCH corresponding to the plurality of UEs is transmitted.
- the sending module 1102 includes:
- a second sending unit configured to send, for each UE in the at least one UE, all the DM RS time-frequency resources corresponding to the DM RS port allocated to the UE in the preset multiplexing unit, and send the UE DM RS; or, transmitting, on the DM RS resource in the resource block pair of the E-PDCCH carrying the UE, the DM RS of the bearer UE.
- the configuration module is further configured to: allocate, when the at least one UE is multiple UEs, different DM RS ports, or allocate at least two UEs of the multiple UEs Same DM RS port.
- the sending module 1102 may include: when the configuration module allocates different DM RS ports to the multiple UEs, the sending module 1102 may include:
- 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.
- the sending module 1102 is further configured to: allocate, by using radio resource control RRC signaling, the multiple UEs.
- the DM RS port is configured to notify the multiple UEs.
- the configuration module is further configured to: pre-configure a binding relationship between the DM RS port and the allocation pattern of the multiplexing unit, and the binding relationship is also configured on the UE side.
- the configuration module 1101 may be configured to: obtain, by using time division multiplexing, or frequency division multiplexing, or time-frequency division multiplexing, the multiple control channel units in the E-PDCCH resource.
- the multiplexing unit may be composed of at least one resource block pair of PDCCH resources and resources other than CRS resources and CSI RS resources.
- the number of control channel units divided by one multiplexing unit, and the information of the control channel unit and the DM RS port mapped by the UE may be notified to the UE by the base station, and the signaling may be an RRC message.
- the semi-static notification is also provided; or the allocation pattern of the control channel unit in the multiplexing unit may be bound to the DM RS port, and the binding relationship is allocated and configured on both sides of the base station and the UE, so that the UE is not separately notified to the UE.
- the base station in this embodiment may be an eNB or the like, which is not specifically limited in this embodiment of the present invention.
- the foregoing base station by dividing a plurality of control channel units for a multiplexing unit, and transmitting at least one E-PDCCH of at least one UE, for each UE, the granularity of the enhanced downlink control channel is a control channel unit. Compared with the granularity of an RB pair in the prior art, the granularity is reduced, the resources are saved, the downlink control channel is enhanced, and more control channels can be provided for the UE.
- the multiplexing unit may divide multiple control channel units in time division multiplexing, frequency division multiplexing, or time division frequency division multiplexing, and multiple control channel units may be distributed or alternately distributed, and have multiple implementation modes, and flexible application. Convenience. Referring to FIG. 12, another embodiment of the present invention provides a user equipment UE, including:
- the receiving module 1201 is configured to receive a signal on a multiplexing unit, where the multiplexing unit includes at least one resource block pair, and the at least one resource block pair includes an enhanced downlink control channel E-PDCCH resource and a demodulation pilot DM RS resource, where
- the E-PDCCH resource includes a plurality of control channel units;
- the channel estimation module 1202 is configured to perform channel estimation by using all the DM RSs received on the multiplexing unit, and the demodulation module 1203 is configured to demodulate the E-PDCCH resource in the multiplexing unit by using the result of the channel estimation. Received signal, obtain E-PDCCH;
- the at least one resource block pair is a PRG, and the number of resource blocks RBs in the PRG is determined by a system bandwidth.
- composition and division of the multiplexing unit involved in this embodiment are the same as those in the foregoing method embodiment, and are not described herein again.
- the UE may obtain the number of control channel units divided by a multiplexing unit, and the information of the control channel unit and the DM RS port mapped by the UE, by receiving signaling sent by the base station, such as RRC signaling; or
- the allocation pattern of the control channel unit in the multiplexing unit and the DM RS port may be bound in advance, and the binding relationship is allocated and configured on both sides of the base station and the UE, so that the UE is not separately notified to the UE.
- the UE provided by the embodiment of the present invention performs channel estimation by using all DM RS signals by receiving signals on the multiplexing unit, and demodulates the signals received on the E-PDCCH resources in the multiplexing unit by using the channel estimation result, thereby obtaining The E-PDCCH of the UE.
- the granularity of the UE enhanced downlink control channel is a control channel unit. Compared with the prior art, the granularity is reduced, resources are saved, and the downlink control channel is enhanced, and more control channels can be provided for the UE.
- FIG. 13 is a flowchart of another method for transmitting an enhanced downlink control channel according to an embodiment of the present invention. The technical terms in this embodiment can be referred to other embodiments of the present invention.
- the method for transmitting the enhanced downlink control channel provided in this embodiment includes:
- the base station determines at least two PRB pairs in a physical resource block (PRB) pair group, where the at least two PRB pairs are used to send an enhanced downlink control channel E-PDCCH and used to demodulate the The pilot DMRS for demodulation of the E-PDCCH.
- PRB physical resource block
- the PRB pair group is composed of multiple consecutive PRB pairs; or the PRB pair group is a pre-coded resource block group PRG, and the number of PRBs in the PRG is determined by system bandwidth. Decide.
- the one E-PDCCH may be one E-PDCCH that is sent to one UE, or one E-PDCCH that is broadcast to multiple UEs.
- the at least two PRB pairs may be non-contiguous PRB pairs in the PRB pair group, or may be consecutive PRB pairs.
- the at least two PRB pairs may be the RB pair n and the RB pair n+1 in FIG. 10e or FIG. 10f
- the E-PDCCH may be, for example, the aggregation level of UE3 transmitted on eCCE2 to eCCE5 is 4. E-PDDCH.
- the base station determines to send a DRMS port of the DMRS.
- the port number of the E-PDDCH corresponding to the DMRS port in the RB pair n and the RB pair n+1 may be the same or different.
- the DMRS for demodulating the E-PDDCH transmitted on eCCE2 ⁇ eCCE3 is transmitted on the DMRS port 9 or 10
- the DMRS for demodulating the E-PDDCH transmitted on eCCE4 ⁇ eCCE5 is Send on DMRS port 7 or 8.
- the determining, by the DRMS port for sending the DMRS includes: determining, in each PRB pair of the at least two PRB pairs, one DRMS port; when the E-PDCCH is a two-layer transmission, the determining to send the DRMS port of the DMRS includes: determining, in each PRB pair of the at least two PRB pairs, a first DRMS port and a second DMRS port.
- the base station pre-codes the E-PDCCH and the DMRS on the at least two PRB pairs by using the same precoding matrix.
- the UE may perform joint channel estimation on the DMRSs of the at least two PRB pairs.
- the joint channel estimation may be: after obtaining the DMRS channel on the at least two PRB pairs, when obtaining the channel on the data RE according to the channel of the DMRS, not only the DMRS channel on the PRB pair where the RE is located, but also Consider the channel of the DMRS on the other PRB pair. That is, according to the DMRS channels on the at least two PRB pairs, the channel of each RE in each PRB pair is jointly obtained.
- the DMRS of the demodulation pilot DRMS port on the at least two PRB pairs is used by using the same precoding matrix.
- Performing precoding includes: precoding the DMRS of the first DRMS port in each of the PRB pairs using one precoding vector in the precoding matrix; using another precoding vector in the same precoding matrix, The DMRS of the second DRMS port on each PRB pair is precoded.
- the UE sends the E-PDCCH sent by the base station to the at least two PRB pairs, and is configured to demodulate the
- the method further includes: the UE determining, on each physical resource block pair of the at least two physical resource block pairs, a DRMS port for receiving the DMRS.
- the 404 is specifically: the UE receives the DMRS by using the determined DMRS port on each physical resource block pair of the at least two physical resource block pairs.
- the port number of the DRMS port used by the at least two physical resource blocks to receive the DMRS may be different.
- the UE determines that a DRMS port for receiving the DMRS on each physical resource block pair in at least two physical resource block pairs includes: A DRMS port for receiving the DMRS is determined on each of the at least two physical resource block pairs.
- the UE determines that a DRMS port for receiving the DMRS on each physical resource block pair in at least two physical resource block pairs includes: the UE is in at least two A first DMRS port and a second DMRS port for receiving the DMRS are determined on each physical resource block pair in the physical resource block pair.
- the UE performs precoding on the E-PDCCH and the DRMS of the at least two PRB pairs according to the base station by using the same precoding matrix, and performs channel estimation on the DMRSs of the at least two PRB pairs.
- the UE may consider that the base station pre-codes the E-PDCCH and the DRMS of the at least two PRB pairs by using the same precoding matrix, that is, the UE considers that the condition for performing joint channel estimation is satisfied, Joint channel estimation is performed on DMRSs of at least two PRB pairs.
- the UE pre-codes the E-PDCCH and the DRMS of the at least two physical resource block pairs according to the base station by using the same precoding matrix.
- Performing channel estimation on the DMRSs of the at least two physical resource block pairs includes: the DMRS of the first DRMS port of the at least two physical resource block pairs by the UE according to the base station using one precoding vector of the same precoding matrix Performing precoding to perform joint channel estimation on the DMRS received at the first DMRS port of the at least two physical resource block pairs.
- the precoding the DMRS of the first DRMS port of the at least two physical resource block pairs by using the one precoding vector of the same precoding matrix by the base station means that the UE considers that the DMRS is satisfied.
- the UE detects the E-PDCCH at a predetermined position of the at least two PRB pairs according to a channel estimation result.
- FIG. 14 is a structural diagram of a base station according to an embodiment of the present invention.
- the base station in this embodiment may implement the method provided in the embodiment corresponding to FIG.
- the related description in other embodiments is also applicable to the base station in this embodiment.
- the base station of this embodiment includes:
- the resource determining unit 141 is configured to determine, in one physical resource block pair group, at least two physical resource block pairs, where the at least two physical resource block pairs are used to send an enhanced downlink control channel E-PDCCH and used for a demodulation Demodulation pilot DMRS for E-PDCCH;
- the precoding unit 142 is configured to precode the E-PDCCH and the DMRS on the at least two physical resource block pairs determined by the resource determining unit 141 by using the same precoding matrix.
- the physical resource block pair group is composed of multiple consecutive physical resource block pairs; or the physical resource block pair group is a pre-coded resource block group PRG, and the physical in the PRG The number of resource blocks is determined by the system bandwidth.
- the base station further includes a port determining unit 143, configured to determine a DRMS port that sends the DMRS, where a port number of the DRMS port on the at least two physical resource block pairs is different.
- the port determining unit 143 when the E-PDCCH is a single layer transmission, the port determining unit 143 is configured to be in each physical resource block pair of the at least two physical resource block pairs, Determining a DRMS port; when the E-PDCCH is a two-layer transmission, the port determining unit 143 is configured to determine a first DRMS port in each physical resource block pair of the at least two physical resource block pairs And a second DMRS port.
- the pre-coding unit 142 is configured to use one pre-coding vector in a pre-coding matrix, for each physical resource block. Precoding the DMRS of the first DRMS port in the pair; precoding the DMRS of the second DRMS port on each of the physical resource block pairs using another precoding vector in the same precoding matrix.
- FIG. 15 is a structural diagram of a user equipment UE according to an embodiment of the present invention.
- the UE in this embodiment can implement the method provided in the embodiment corresponding to FIG.
- the related description in other embodiments is also applicable to the base station in this embodiment.
- the UE of this embodiment includes:
- the receiving unit 151 is configured to send, by the at least two physical resource blocks in the group of one physical resource block pair, the receiving base station An enhanced downlink control channel E-PDCCH and a demodulation pilot DRMS for demodulating the E-PDCCH;
- the channel estimation unit 152 is configured to precode the E-PDCCH and the DRMS of the at least two physical resource block pairs according to the base station by using the same precoding matrix, and receive the at least two received by the receiving unit 151.
- the detecting unit 153 is configured to detect the E-PDCCH at a predetermined position of the at least two physical resource block pairs according to the channel estimation result obtained by the channel estimating unit.
- the channel estimation unit 152 is configured to precode the E-PDCCH and the DRMS of the at least two physical resource block pairs according to the base station by using the same precoding matrix.
- the DMRS of the at least two physical resource block pairs received by the receiving unit 151 performs joint channel estimation.
- the physical resource block pair group is composed of multiple consecutive physical resource block pairs; or the physical resource block pair is a pre-coded resource block group PRG, and resources in the PRG The number of block RBs is determined by the system bandwidth.
- the UE further includes: a determining unit 154, configured to determine, on each physical resource block pair of the at least two physical resource block pairs, a DRMS port that is used to receive the DMRS;
- the receiving unit 151 is configured to receive, by using the determined DMRS port, a DMRS on each physical resource block pair of the at least two physical resource block pairs, where the at least two physical resource block pairs are used for receiving the DMRS.
- the port number of the DRMS port is different.
- the determining unit 154 when the E-PDCCH is a single layer transmission, the determining unit 154 is configured to determine, on each physical resource block pair, the at least two physical resource block pairs for receiving a DRMS port of the DMRS; when the E-PDCCH is a two-layer transmission, the determining unit 154 is configured to determine, on each physical resource block pair of the at least two physical resource block pairs, to receive the DMRS A first DMRS port and a second DMRS port.
- the channel estimation unit 152 is configured to use, according to the base station, a precoding vector of the same precoding matrix. Precoding the DMRS of the first DRMS port of the two physical resource block pairs, performing joint channel estimation on the DMRS received at the first DMRS port of the at least two physical resource block pairs; using the same pre-preparation according to the base station Another precoding vector of the coding matrix precoding the DMRS of the second DRMS port of the at least two physical resource block pairs, and performing the DMRS received on the second DMRS port of the at least two physical resource block pairs Joint channel estimation.
- the at least two physical resource block pairs are two consecutive physical resources.
- Source block pair Referring to FIG. 16, another embodiment of the present invention provides a system for transmitting downlink control information, including a base station 1301 and a UE 1302, where the base station 1301 may be the base station in any of the foregoing embodiments, and the UE 1302 may be any of the foregoing.
- the system divides a plurality of control channel units for the multiplexing unit, and sends at least one E-PDCCH corresponding to the at least one UE.
- the granularity of the enhanced downlink control channel is a control channel unit, and the existing Compared with the granularity of an RB pair, the technology reduces the granularity, saves resources, implements enhancement of the downlink control channel, and provides more control channels for the UE to use.
- the multiplexing unit may divide multiple control channel units in time division multiplexing, frequency division multiplexing, or time division frequency division multiplexing, and multiple control channel units may be distributed or alternately distributed, and have multiple implementation modes, and flexible application. Convenience.
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Abstract
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Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12823933.2A EP2739102B1 (en) | 2011-08-18 | 2012-08-20 | Method, device, and system for transmitting extended physical downlink control channel |
EP16163507.3A EP3104649B1 (en) | 2011-08-18 | 2012-08-20 | Method, device and system for transmitting extended physical downlink control channel |
KR1020147006250A KR101570777B1 (ko) | 2011-08-18 | 2012-08-20 | 강화된 물리 다운링크 제어 채널을 전송하는 방법, 장치 및 시스템 |
RU2014110179/07A RU2558717C1 (ru) | 2011-08-18 | 2012-08-20 | Способ, устройство и система для передачи расширенного канала управления нисходящей линии |
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JP2014525300A JP5938100B2 (ja) | 2011-08-18 | 2012-08-20 | 拡張下りリンク制御チャネルを伝送するための方法、デバイス、およびシステム |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015519825A (ja) * | 2012-05-01 | 2015-07-09 | クゥアルコム・インコーポレイテッドQualcomm I | 低コストユーザ機器のための制御およびデータ送信を管理するための方法および装置 |
US20210068134A1 (en) * | 2018-05-11 | 2021-03-04 | Huawei Technologies Co., Ltd. | Communications method and apparatus |
US12137450B2 (en) * | 2018-05-11 | 2024-11-05 | Huawei Technologies Co., Ltd. | Communications method and apparatus |
Families Citing this family (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106793141B (zh) * | 2011-09-29 | 2020-03-31 | 华为技术有限公司 | 增强的物理下行控制信道e-pdcch的传输方法及设备 |
JP6081470B2 (ja) * | 2011-10-20 | 2017-02-15 | サムスン エレクトロニクス カンパニー リミテッド | 無線通信システムにおける制御情報の送受信方法及び装置 |
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US9313782B2 (en) * | 2013-05-08 | 2016-04-12 | Qualcomm Incorporated | Enhanced PDSCH operation |
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CN110474748B (zh) | 2018-05-11 | 2023-10-20 | 华为技术有限公司 | 功率抬升值确定方法和装置 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102082600A (zh) * | 2009-12-01 | 2011-06-01 | 中兴通讯股份有限公司 | 中继链路下行控制信息配置方法及传输基站、中继站与方法 |
WO2011085195A1 (en) * | 2010-01-11 | 2011-07-14 | Research In Motion Limited | System and method for control channel interference management and extended pdcch |
CN102420685A (zh) * | 2011-11-07 | 2012-04-18 | 电信科学技术研究院 | 一种传输控制信息的方法及装置 |
CN102612094A (zh) * | 2012-04-01 | 2012-07-25 | 华为技术有限公司 | 一种控制信令资源单元确定方法、基站及用户设备 |
WO2012109542A1 (en) * | 2011-02-11 | 2012-08-16 | Interdigital Patent Holdings, Inc | Systems and methods for an enhanced control channel |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2233543C2 (ru) * | 1999-04-12 | 2004-07-27 | Самсунг Электроникс Ко., Лтд. | Устройство и способ осуществления передачи со стробированием в системе связи мдкр |
JP4884722B2 (ja) * | 2005-03-31 | 2012-02-29 | 株式会社エヌ・ティ・ティ・ドコモ | 無線通信装置及び無線通信方法 |
JP2010245641A (ja) * | 2009-04-01 | 2010-10-28 | Sharp Corp | 無線システム、基地局装置、移動局装置、通信方法、プログラム |
US8797950B2 (en) * | 2009-05-27 | 2014-08-05 | Texas Instruments Incorporated | Dual-layer beam forming in cellular networks |
US8804586B2 (en) * | 2010-01-11 | 2014-08-12 | Blackberry Limited | Control channel interference management and extended PDCCH for heterogeneous network |
KR101684867B1 (ko) * | 2010-04-07 | 2016-12-09 | 삼성전자주식회사 | 공간 다중화 이득을 이용한 제어 정보 송수신 방법 |
US9036577B2 (en) * | 2010-06-21 | 2015-05-19 | Panasonic Intellectual Property Corporation Of America | Wireless communication apparatus and wireless communication method |
US10044489B2 (en) * | 2010-10-22 | 2018-08-07 | Nokia Solutions And Networks Oy | Enhanced inter-network access node scheduling coordination and signaling support for advanced receiver algorithms |
US9001756B2 (en) * | 2011-04-27 | 2015-04-07 | Texas Instruments Incorporated | Physical downlink control channel and physical hybrid automatic repeat request indicator channel enhancements |
JP5663700B2 (ja) * | 2011-06-30 | 2015-02-04 | エルジー エレクトロニクス インコーポレイティド | 無線通信システムにおけるダウンリンク制御チャネル割当方法及び装置 |
US8665811B2 (en) * | 2011-08-15 | 2014-03-04 | Motorola Mobility Llc | Reference signal for a control channel in wireless communication network |
US9655087B2 (en) * | 2012-08-16 | 2017-05-16 | Kt Corporation | Configuration and mapping of uplink control channel resource |
-
2012
- 2012-03-22 CN CN201210079003.XA patent/CN102958183B/zh active Active
- 2012-08-20 JP JP2014525300A patent/JP5938100B2/ja active Active
- 2012-08-20 EP EP12823933.2A patent/EP2739102B1/en active Active
- 2012-08-20 WO PCT/CN2012/080355 patent/WO2013023621A1/zh active Application Filing
- 2012-08-20 EP EP16163507.3A patent/EP3104649B1/en active Active
- 2012-08-20 RU RU2014110179/07A patent/RU2558717C1/ru active
- 2012-08-20 KR KR1020157032424A patent/KR101685517B1/ko active IP Right Grant
- 2012-08-20 HU HUE12823933A patent/HUE030265T2/en unknown
- 2012-08-20 KR KR1020147006250A patent/KR101570777B1/ko active IP Right Grant
-
2014
- 2014-02-18 US US14/182,558 patent/US10277372B2/en active Active
-
2016
- 2016-05-13 JP JP2016097154A patent/JP6357495B2/ja active Active
-
2019
- 2019-04-16 US US16/385,252 patent/US10903955B2/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102082600A (zh) * | 2009-12-01 | 2011-06-01 | 中兴通讯股份有限公司 | 中继链路下行控制信息配置方法及传输基站、中继站与方法 |
WO2011085195A1 (en) * | 2010-01-11 | 2011-07-14 | Research In Motion Limited | System and method for control channel interference management and extended pdcch |
WO2012109542A1 (en) * | 2011-02-11 | 2012-08-16 | Interdigital Patent Holdings, Inc | Systems and methods for an enhanced control channel |
CN102420685A (zh) * | 2011-11-07 | 2012-04-18 | 电信科学技术研究院 | 一种传输控制信息的方法及装置 |
CN102612094A (zh) * | 2012-04-01 | 2012-07-25 | 华为技术有限公司 | 一种控制信令资源单元确定方法、基站及用户设备 |
Non-Patent Citations (2)
Title |
---|
NTT DOCOMO: "DM-RS Design forE-PDCCH in Rel-11", 3GPP TSG RAN WGL METTING #67, RL-114302, 14 November 2011 (2011-11-14), SAN FRANCISCO, USA, XP050562352 * |
See also references of EP2739102A4 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015519825A (ja) * | 2012-05-01 | 2015-07-09 | クゥアルコム・インコーポレイテッドQualcomm I | 低コストユーザ機器のための制御およびデータ送信を管理するための方法および装置 |
US10200985B2 (en) | 2012-05-01 | 2019-02-05 | Qualcomm Incorporated | Methods and apparatus for managing control and data transmissions for low cost user equipments |
US20210068134A1 (en) * | 2018-05-11 | 2021-03-04 | Huawei Technologies Co., Ltd. | Communications method and apparatus |
US12137450B2 (en) * | 2018-05-11 | 2024-11-05 | Huawei Technologies Co., Ltd. | Communications method and apparatus |
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KR20150134437A (ko) | 2015-12-01 |
HUE030265T2 (en) | 2017-04-28 |
KR101570777B1 (ko) | 2015-11-20 |
EP2739102B1 (en) | 2016-07-27 |
US20190245665A1 (en) | 2019-08-08 |
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US20140233474A1 (en) | 2014-08-21 |
RU2558717C1 (ru) | 2015-08-10 |
US10903955B2 (en) | 2021-01-26 |
KR101685517B1 (ko) | 2016-12-12 |
CN102958183A (zh) | 2013-03-06 |
JP5938100B2 (ja) | 2016-06-22 |
JP6357495B2 (ja) | 2018-07-11 |
KR20140054209A (ko) | 2014-05-08 |
EP2739102A4 (en) | 2014-08-06 |
JP2014527760A (ja) | 2014-10-16 |
EP3104649A1 (en) | 2016-12-14 |
EP2739102A1 (en) | 2014-06-04 |
EP3104649B1 (en) | 2019-07-31 |
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