CN110546907A - Downlink control information transmission method, terminal equipment and network equipment - Google Patents

Downlink control information transmission method, terminal equipment and network equipment Download PDF

Info

Publication number
CN110546907A
CN110546907A CN201780089841.6A CN201780089841A CN110546907A CN 110546907 A CN110546907 A CN 110546907A CN 201780089841 A CN201780089841 A CN 201780089841A CN 110546907 A CN110546907 A CN 110546907A
Authority
CN
China
Prior art keywords
downlink control
control channel
block set
resource block
domain symbols
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201780089841.6A
Other languages
Chinese (zh)
Inventor
成艳
李超君
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Publication of CN110546907A publication Critical patent/CN110546907A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path

Abstract

The embodiment of the application provides a downlink control information transmission method, terminal equipment and network equipment, wherein the method comprises the following steps: the network equipment sends downlink control information through a downlink control channel, the downlink control channel is demodulated based on CRS, and sends a physical downlink shared channel scheduled by the downlink control information, the physical downlink shared channel is demodulated based on DMRS, correspondingly, the terminal equipment detects the downlink control channel demodulated based on CRS, and decodes the physical downlink shared channel demodulated based on DMRS according to the downlink control information carried on the downlink control channel, wherein the transmission time interval of the carried downlink control channel and the physical downlink shared channel is less than 1 millisecond. According to the technical scheme, the terminal equipment can determine whether the time-frequency resource carrying the demodulation based on the CRS comprises the resource unit carrying the DMRS used for the sPDSCH demodulation, so that the downlink control information carried by the sPDSCH can be successfully demodulated.

Description

Downlink control information transmission method, terminal equipment and network equipment Technical Field
The present application relates to the field of communications technologies, and in particular, to a downlink control information transmission method, a terminal device, and a network device.
Background
In a wireless communication system, before a terminal device receives downlink data or transmits uplink data, it needs to know Downlink Control Information (DCI) such as configuration information given to the terminal device by a network device, and the downlink control information is usually carried by a downlink control channel.
At present, as the requirement of the wireless communication system for the transmission delay is higher and higher, a short transmission time interval (sTTI) is introduced into a Long Term Evolution (LTE) system to develop into an LTE system supporting sTTI. The control channel and the data channel corresponding to the LTE system supporting the sTTI also support the sTTI, and thus the LTE system supporting the sTTI supports both short physical downlink control channel (sPDCCH) demodulated based on a Cell Reference Signal (CRS) and sPDCCH demodulated based on a demodulation reference signal (DMRS). That is to say, the LTE system supporting sTTI supports short physical downlink shared channel (sPDSCH) based on CRS demodulation for sPDCCH scheduling based on CRS demodulation, and supports sPDCCH based on DMRS demodulation for sPDCCH scheduling based on DMRS demodulation.
In the above scheme, whether DMRS used for sPDSCH demodulation is transmitted depends on whether sPDSCH is scheduled, but in the prior art, it is not clear whether the LTE system supporting sTTI supports sPDCCH based on CRS demodulation for scheduling sPDSCH based on DMRS demodulation, and before the terminal device decodes sPDCCH based on CRS demodulation, it is not clear whether sPDCCH based on CRS demodulation is scheduled based on DMRS demodulation, and thus it cannot be determined whether resource elements carrying DMRSs used for sPDCCH demodulation are included in time-frequency resources carrying CRS demodulation, which may result in that downlink control information carried by sPDCCH cannot be successfully demodulated.
In summary, in the prior art, a problem exists that the terminal device cannot successfully demodulate the downlink control information carried by the sPDCCH.
Disclosure of Invention
The embodiment of the application provides a downlink control information transmission method, terminal equipment and network equipment, which are used for solving the problem that the terminal equipment cannot successfully demodulate downlink control information borne by an sPDCCH (physical downlink control channel).
A first aspect of the present application provides a method for transmitting downlink control information, including:
the terminal equipment detects a downlink control channel demodulated based on a cell reference signal CRS;
the terminal equipment decodes a physical downlink shared channel demodulated based on a demodulation reference signal (DMRS) according to downlink control information carried on the downlink control channel;
and the transmission time interval for bearing the downlink control channel and the physical downlink shared channel is less than 1 millisecond.
In this embodiment, before demodulating sPDCCH based on CRS demodulation, the terminal device can determine whether sPDCCH based on CRS demodulation schedules sPDSCH based on DMRS demodulation, so that it can determine whether the time-frequency resource carrying CRS demodulation includes a resource unit carrying DMRS for sPDSCH demodulation, and the terminal device can successfully demodulate downlink control information carried by sPDCCH.
In an embodiment of the first aspect, the detecting, by the terminal device, a downlink control channel demodulated based on a cell reference signal CRS includes:
the terminal equipment receives first configuration information of a downlink control channel resource block set, wherein the downlink control channel resource block set is used for bearing a downlink control channel, and the first configuration information is used for indicating the number of time domain symbols corresponding to the downlink control channel resource block set;
the terminal equipment determines the number of time domain symbols corresponding to the downlink control channel resource block set according to the first configuration information;
and the terminal equipment detects the downlink control channel according to the number of the time domain symbols corresponding to the downlink control channel resource block set.
In the foregoing embodiment of the first aspect, the detecting, by the terminal device, the downlink control channel according to the number of time domain symbols corresponding to the downlink control channel resource block set includes:
if the number of time domain symbols corresponding to the downlink control channel resource block set is smaller than the number of time domain symbols corresponding to the transmission time interval, the terminal device assumes that the time-frequency resources corresponding to the downlink control channel resource block set include resource units corresponding to a DMRS for demodulating a physical downlink shared channel when detecting the downlink control channel;
if the number of time domain symbols corresponding to the downlink control channel resource block set is equal to the number of time domain symbols corresponding to the transmission time interval, and the control channel units corresponding to the downlink control channel are mapped to the resource unit group according to the time-first and frequency-second rule, the terminal device assumes that the time-frequency resources corresponding to the downlink control channel resource block set do not include the resource units corresponding to the DMRS for demodulating the physical downlink shared channel when detecting the downlink control channel;
if the number of time domain symbols corresponding to the downlink control channel resource block set is equal to the number of time domain symbols corresponding to the transmission time interval, and the control channel units corresponding to the downlink control channel are mapped to the resource unit group according to the rule of frequency first and time later, the terminal device assumes that the time-frequency resources corresponding to the downlink control channel resource block set include the resource units corresponding to the DMRS for demodulating the physical downlink shared channel when detecting the downlink control channel.
In the embodiment, the terminal device detects the CRS demodulation-based downlink control channel according to the first configuration information of the received downlink control channel resource block set and according to the determined time domain symbol number corresponding to the downlink control channel resource block set, thereby solving the ambiguity problem whether the DMRS exists in the process of demodulating the sPDCCH, enabling the sPDCCH based on the CRS demodulation to schedule the sPDSCH based on the DMRS demodulation, avoiding the defect that the sPDCCH based on the DMRS demodulation can only be used for scheduling the sPDSCH based on the DMRS demodulation in the prior art, needing no special DMRS specially transmitted for the sPDCCH demodulation, reducing the reference signal overhead, avoiding the defect that the resource utilization rate is reduced due to the limitation of a transmission mechanism of the sPDSCH caused by the need of sharing DMRS resource units by the sPDCCH and the sPDSCH, improving the resource utilization rate, improving the spectrum efficiency, and in addition, by adopting the sPDCCH based on the CRS demodulation, being capable of obtaining higher transmission performance than the sPDCCH based on the demodulation, the transmission reliability of the sPDCCH is improved.
In another embodiment of the first aspect, the detecting, by the terminal device, a downlink control channel demodulated based on a cell reference signal CRS includes:
the terminal equipment determines the number of time domain symbols of a downlink control channel detection region corresponding to the downlink control channel;
the terminal equipment detects the downlink control channel according to the time domain symbol number of a downlink control channel detection region corresponding to the downlink control channel;
the terminal device detects the downlink control channel according to the number of time domain symbols of a downlink control channel detection region corresponding to the downlink control channel, and the method comprises the following steps:
if the number of time domain symbols in the downlink control channel detection region corresponding to the downlink control channel is smaller than the number of time domain symbols corresponding to the transmission time interval, the terminal device assumes that the time-frequency resource corresponding to the downlink control channel resource block set includes a resource unit corresponding to a DMRS for demodulating a physical downlink shared channel when detecting the downlink control channel;
if the number of time domain symbols in the downlink control channel detection region corresponding to the downlink control channel is equal to the number of time domain symbols corresponding to the transmission time interval, and the control channel unit corresponding to the downlink control channel is mapped to the resource unit group according to the time-first and frequency-second rule, the terminal device assumes that the time-frequency resource corresponding to the downlink control channel resource block set does not include the resource unit corresponding to the DMRS for demodulating the physical downlink shared channel when detecting the downlink control channel;
if the number of time domain symbols in the downlink control channel detection region corresponding to the downlink control channel is equal to the number of time domain symbols corresponding to the transmission time interval, and the control channel unit corresponding to the downlink control channel is mapped to the resource unit group according to the rule of frequency first and time later, the terminal device assumes that the time-frequency resource corresponding to the downlink control channel resource block set includes the resource unit corresponding to the DMRS for demodulating the physical downlink shared channel when detecting the downlink control channel.
According to the technical scheme, the terminal equipment detects the downlink control channel based on CRS demodulation according to the number of time domain symbols of the downlink control channel detection region corresponding to the determined downlink control channel, so that the sPDCCH based on CRS demodulation can be used for scheduling the sPDSCH based on DMRS demodulation, higher transmission performance than the sPDCCH based on DMRS demodulation can be obtained, and the transmission reliability of the sPDCCH is improved.
In a further embodiment of the first aspect, the detecting, by the terminal device, a downlink control channel demodulated based on a cell reference signal CRS includes:
the terminal equipment receives a high-level signaling, wherein the high-level signaling is used for indicating the terminal equipment to detect the downlink control channel according to a first detection mode or a second detection mode;
the terminal equipment detects the downlink control channel according to the high-level signaling;
the detecting, by the terminal device, the downlink control channel according to the high-level signaling includes:
if the high-level signaling indicates that the terminal equipment detects the downlink control channel according to a first detection mode, the terminal equipment assumes that a control channel region corresponding to the downlink control channel comprises a resource unit corresponding to a DMRS (demodulation reference signal) for demodulating a physical downlink shared channel when detecting the downlink control channel;
and if the high-level signaling indicates that the terminal equipment detects the downlink control channel according to a second detection mode, the terminal equipment assumes that a control channel region corresponding to the downlink control channel does not include a resource unit corresponding to a DMRS (demodulation reference signal) for demodulating a physical downlink shared channel when detecting the downlink control channel.
According to the technical scheme, the terminal equipment detects the downlink control channel demodulated based on the CRS by using the high-level signaling sent by the network equipment, the network equipment can flexibly change between the first detection mode and the second detection mode according to the actual situation, the actual application situation can be matched better, and therefore the resource utilization efficiency is improved.
In another embodiment of the first aspect, the detecting, by the terminal device, a downlink control channel demodulated based on a cell reference signal CRS includes:
the terminal equipment receives second configuration information of a downlink control channel resource block set, the downlink control channel is borne on a time-frequency resource corresponding to the downlink control channel resource block set, and the second configuration information is used for indicating the terminal equipment to detect the downlink control channel according to a first detection mode or a second detection mode;
the terminal equipment detects the downlink control channel according to the second configuration information;
the detecting, by the terminal device, the downlink control channel according to the second configuration information includes:
if the second configuration information indicates that the terminal equipment detects the downlink control channel according to a first detection mode, the terminal equipment assumes that time-frequency resources corresponding to the downlink control channel resource block set comprise resource units corresponding to a DMRS (demodulation reference signal) for demodulating a physical downlink shared channel when detecting the downlink control channel;
if the second configuration information indicates that the terminal device detects the downlink control channel according to a second detection mode, the terminal device assumes that the time-frequency resource corresponding to the downlink control channel resource block set does not include a resource unit corresponding to a DMRS for demodulating a physical downlink shared channel when detecting the downlink control channel.
In the foregoing embodiment of the first aspect, the detecting, by the terminal device, the downlink control channel demodulated based on a cell reference signal CRS further includes:
the terminal equipment receives first configuration information of a downlink control channel resource block set, wherein the first configuration information is used for indicating the number of time domain symbols corresponding to the downlink control channel resource block set;
the terminal equipment determines the number of time domain symbols corresponding to the downlink control channel resource block set according to the first configuration information;
the terminal equipment detects the downlink control channel according to the number of time domain symbols corresponding to the downlink control channel resource block set and the second configuration information;
the detecting, by the terminal device, the downlink control channel according to the number of time domain symbols corresponding to the downlink control channel resource block set and the second configuration information includes:
if the number of time domain symbols corresponding to the downlink control channel resource block set is smaller than the number of time domain symbols corresponding to the transmission time interval, the terminal device assumes that the time-frequency resources corresponding to the downlink control channel resource block set include resource units corresponding to a DMRS for demodulating a physical downlink shared channel when detecting the downlink control channel;
and if the number of the time domain symbols corresponding to the downlink control channel resource block set is equal to the number of the time domain symbols corresponding to the transmission time interval, the terminal equipment detects the downlink control channel according to the second configuration information.
According to the technical scheme, the terminal equipment detects the downlink control channel based on CRS demodulation by using the second configuration information and/or the second configuration information sent by the network equipment, and can also enable the sPDCCH based on CRS demodulation to schedule the sPDSCH based on DMRS demodulation, so that higher transmission performance than the sPDCCH based on DMRS demodulation can be obtained, and the transmission reliability of the sPDCCH is improved.
In another embodiment of the first aspect, the detecting, by the terminal device, a downlink control channel demodulated based on a cell reference signal CRS includes:
and when the terminal equipment detects the downlink control channel, the control channel region corresponding to the downlink control channel is assumed to comprise resource units corresponding to the DMRS for demodulating the physical downlink shared channel.
The technical scheme assumes that a control channel region corresponding to the downlink control channel based on CRS demodulation comprises a resource unit corresponding to a DMRS (demodulation reference signal) for demodulating a physical downlink shared channel when the terminal equipment detects the downlink control channel based on CRS demodulation, solves the problem that the resource utilization rate is reduced due to the limitation of a transmission mechanism of sPDSCH caused by the need of sharing the DMRS resource unit by the sPDCCH and the sPDSCH, and improves the resource utilization rate and the spectrum efficiency.
In another embodiment of the first aspect, the detecting, by the terminal device, a downlink control channel demodulated based on a cell reference signal CRS includes:
the terminal equipment detects a downlink control channel demodulated based on CRS in a non-multicast/multicast single frequency network MBSFN subframe;
and the terminal equipment detects the downlink control channel based on DMRS demodulation in the MBSFN subframe.
According to the technical scheme, the network equipment sends downlink control information and a physical downlink shared channel scheduled by the downlink control information, the terminal equipment detects the downlink control channel and decodes the physical downlink shared channel according to the downlink control information loaded on the downlink control channel, and the network equipment also sends third configuration information of a downlink control channel resource block set, so that the terminal equipment can be scheduled in each subframe, and service delay is reduced.
A second aspect of the present application provides a downlink control information transmission method, including:
the network equipment sends downlink control information through a downlink control channel, and the downlink control channel is demodulated based on a cell reference signal CRS;
the network equipment sends a physical downlink shared channel scheduled by the downlink control information, and the physical downlink shared channel is demodulated based on a demodulation reference signal (DMRS);
and the transmission time interval for bearing the downlink control channel and the physical downlink shared channel is less than 1 millisecond.
In an embodiment of the second aspect of the present application, the method further includes:
the network equipment sends first configuration information of a downlink control channel resource block set, wherein the downlink control channel resource block set is used for bearing the downlink control channel, and the first configuration information is used for indicating the number of time domain symbols corresponding to the downlink control channel resource block set;
and when the number of the time domain symbols corresponding to the downlink control channel resource block set is equal to the number of the time domain symbols corresponding to the transmission time interval, the network equipment performs mapping from the control channel unit corresponding to the downlink control channel to the resource unit group according to a time-first and frequency-second rule.
In another embodiment of the second aspect of the present application, the method further comprises:
and the network equipment sends a high-level signaling, wherein the high-level signaling is used for indicating the terminal equipment to detect the downlink control channel according to a first detection mode or a second detection mode.
In yet another embodiment of the second aspect of the present application, the method further comprises:
the network device sends second configuration information of a downlink control channel resource block set, the downlink control channel is borne on a time-frequency resource corresponding to the downlink control channel resource block set, and the second configuration is used for indicating the terminal device to detect the downlink control channel according to a first detection mode or a second detection mode.
In yet another embodiment of the second aspect of the present application, the method further comprises:
the network equipment sends third configuration information of a downlink control channel resource block set, wherein the third configuration information is used for indicating configuration information of a first downlink control channel resource block set and configuration information of a second downlink control channel resource block set, the first downlink control channel resource block set is used for bearing a downlink control channel based on CRS demodulation, and the second downlink control channel resource block set is used for bearing a downlink control channel based on DMRS demodulation.
In the foregoing embodiment of the second aspect of the present application, the sending, by the network device, the downlink control information through a downlink control channel includes:
the network equipment sends the downlink control information through the first downlink control channel resource block set in a non-MBSFN subframe;
and the network equipment sends the downlink control information through the second downlink control channel resource set in the MBSFN subframe.
A third aspect of the embodiments of the present application provides a terminal device, where the terminal device includes a processor and a memory, where the memory is used to store a program, and the processor calls the program stored in the memory to execute the method provided in the first aspect of the present application.
A fourth aspect of the embodiments of the present application provides a network device, where the network device includes a processor and a memory, where the memory is used to store a program, and the processor calls the program stored in the memory to execute the method provided in the second aspect of the present application.
A fifth aspect of embodiments of the present application provides a terminal device, including at least one processing element (or chip) configured to perform the method of the first aspect above.
A sixth aspect of embodiments of the present application provides a network device, comprising at least one processing element (or chip) configured to perform the method of the second aspect above.
A seventh aspect of the embodiments of the present application provides a communication system, where the system includes a terminal device as described in the third aspect and a network device as described in the fourth aspect.
An eighth aspect of embodiments of the present application provides a computer-readable storage medium, having stored therein instructions, which, when executed on a computer, cause the computer to perform the method of the first aspect.
A ninth aspect of embodiments of the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the first aspect described above.
A tenth aspect of embodiments of the present application provides a computer-readable storage medium having stored therein instructions, which, when run on a computer, cause the computer to perform the method of the second aspect described above.
An eleventh aspect of embodiments of the present application provides a computer program product comprising instructions, which when run on a computer, cause the computer to perform the method of the second aspect.
In the above aspects, the network device transmits downlink control information through a downlink control channel, the downlink control channel is demodulated based on CRS, and transmits a physical downlink shared channel scheduled by the downlink control information, the physical downlink shared channel is demodulated based on DMRS, and accordingly, the terminal device detects the downlink control channel demodulated based on CRS and decodes the physical downlink shared channel demodulated based on DMRS according to the downlink control information carried on the downlink control channel, wherein the transmission time interval for carrying the downlink control channel and the physical downlink shared channel is less than 1 millisecond. In the technical scheme, before demodulating sPDCCH based on CRS demodulation, the terminal equipment can clearly determine whether sPDCCH based on CRS demodulation schedules sDSCH based on DMRS demodulation, so that whether resource units for bearing DMRS used for sDSCH demodulation are included in time-frequency resources based on CRS demodulation can be determined, and the terminal equipment can successfully demodulate downlink control information borne by sPDCCH.
Drawings
Fig. 1 is a schematic structural diagram of a communication system according to an embodiment of the present application;
fig. 2 is an interaction diagram of a first downlink control information transmission method according to an embodiment of the present application;
fig. 3 is an interaction diagram of a second downlink control information transmission method according to an embodiment of the present application;
fig. 4 is an interaction diagram of a third embodiment of a downlink control information transmission method according to an embodiment of the present application;
fig. 5 is an interaction diagram of a fourth downlink control information transmission method according to an embodiment of the present application;
fig. 6 is an interaction diagram of a fifth embodiment of a downlink control information transmission method according to an embodiment of the present application;
fig. 7 is an interaction diagram of a seventh embodiment of a downlink control information transmission method according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a terminal device according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a network device according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of another terminal device provided in an embodiment of the present application;
fig. 11 is a schematic structural diagram of another network device according to an embodiment of the present application;
fig. 12 is a schematic structural diagram of a communication system according to an embodiment of the present application.
Detailed Description
The downlink control information transmission method provided in the following embodiments of the present application may be applied to a communication system. Fig. 1 is a schematic structural diagram of a communication system according to an embodiment of the present application. As shown in fig. 1, the communication system may include at least one network device 110 and a plurality of terminal devices 120 located within the coverage area of the network device 110. Fig. 1 exemplarily shows one network device and two terminal devices, and optionally, the communication system may include a plurality of network devices and may include other numbers of terminal devices within the coverage of each network device, which is not limited in this embodiment of the present application.
That is to say, the downlink control information transmission method provided in the embodiment of the present application may be applied to information transmission between a network device and a terminal device in a communication system, and it should be understood that the downlink control information may be sent by the network device to the terminal device, or the uplink control information sent by the terminal device may be received by the network device, and a specific form is determined according to actual needs, which is not limited herein.
Optionally, the communication system may further include other network entities such as a network controller, a mobility management entity, and the like, which is not limited thereto in the embodiments of the present application.
The communication system applied in the embodiment of the present application may be a global system for mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a General Packet Radio Service (GPRS), a Long Term Evolution (LTE) system, a Frequency Division Duplex (FDD) system, a Time Division Duplex (TDD) system, a universal mobile communication system (UMTS), and other wireless communication systems applying Orthogonal Frequency Division Multiplexing (OFDM) technology. The system architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not form a limitation on the technical solution provided in the embodiment of the present application, and as a person of ordinary skill in the art knows that along with the evolution of the network architecture and the appearance of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.
The network device according to the embodiment of the present application may be configured to provide a terminal device with a wireless communication function, for example, may be configured to send downlink control information to the terminal device. The network devices may include various forms of macro base stations, micro base stations (also referred to as small stations), relay stations, access points, and the like. The network device may be a Base Transceiver Station (BTS) in GSM or CDMA, a base station (nodeB, NB) in WCDMA, an evolved node B (eNB or e-nodeB) in LTE, and a corresponding device gbb in a 5G network. For convenience of description, in all embodiments of the present application, the above-mentioned apparatus for providing a wireless communication function for a terminal device is collectively referred to as a network device.
In this embodiment, the terminal device may also be referred to as a User Equipment (UE), a Mobile Station (MS), a mobile terminal (mobile terminal), a terminal (terminal), and the like, and the terminal device may communicate with one or more core networks via a Radio Access Network (RAN), for example, the terminal device may be a mobile phone (or a "cellular" phone), a computer with a mobile terminal, and the like, for example, the terminal device may also be a portable, pocket, handheld, computer-embedded, or vehicle-mounted mobile device, and they exchange languages and/or data with the RAN. The embodiments of the present application are not particularly limited.
In the embodiments of the present application, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
First, a brief description is given of an application scenario of the embodiment of the present application.
In a wireless communication system, before receiving downlink data or transmitting uplink data, a terminal device needs to know scheduling information configured to the terminal device by a network device, such as time-frequency resource allocation, a modulation and coding scheme, and the like. These pieces of scheduling information are called Downlink Control Information (DCI). It should be noted that, in the embodiments of the present application, a specific expression of the downlink control information is not limited, that is, the downlink control information is not limited to the scheduling information, and also includes other information, such as power control indication information, channel state information request information, and the like.
In a wireless communication system, downlink control information is typically carried over a downlink control channel. For example, in a system before Long Term Evolution (LTE) Rel-13 (release 13), a network device mainly carries DCI through a Physical Downlink Control Channel (PDCCH) and an Enhanced Physical Downlink Control Channel (EPDCCH), and when the DCI is transmitted, a Transmission Time Interval (TTI) length is 1ms regardless of the PDCCH or the EPDCCH. In a system before Long Term Evolution (LTE) Rel-13 (release 13), a network device mainly carries downlink data through a Physical Downlink Shared Channel (PDSCH), and supports both a PDSCH demodulated based on a cell-specific reference signal (CRS) and a PDSCH demodulated based on a (modulation reference signal, DMRS). PDCCH is demodulated based on CRS, EPDCCH is demodulated based on DMRS.
In a wireless communication system, latency (latency) is one of the important factors affecting user experience. New services, such as services related to internet of vehicles, etc., which are continuously present in the wireless communication system, have higher and higher requirements for time delay. However, the requirement of low-delay service cannot be satisfied based on the transmission time interval with the length of 1 ms. Therefore, the LTE evolved system introduces a short transmission time interval (short TTI, sTTI), for example, the length of the sTTI may be 2 time domain symbols or 7 time domain symbols. For example, the corresponding downlink control channel may be called sPDCCH, the uplink control channel may be called sPUCCH, the physical downlink shared channel may be called sPDSCH, and the physical uplink shared channel may be called sPUSCH. It should be noted that the control channel and the data channel corresponding to the LTE system supporting sTTI may also be called by other names. The short transmission time interval sTTI may also have other names, for example, may be referred to as a short transmission time unit (short transmission time unit) or a short transmission duration (short transmission duration).
The LTE system supporting sTTI, namely supporting PDSCH based on CRS demodulation, also supports PDSCH based on DMRS demodulation. The LTE system supporting the sTTI supports both sPDCCH based on CRS demodulation and sPDCCH based on DMRS demodulation. In the prior art, an LTE system supporting sTTI supports sPDCCH scheduling based on CRS demodulation and sPDSCH based on CRS demodulation, and the sPDCCH scheduling based on DMRS demodulation and sPDSCH based on DMRS demodulation. However, whether the LTE system supporting sTTI supports sPDCCH demodulation based on CRS demodulation or not is not clear at present, and further research is needed.
At present, since the LTE system supporting sTTI does not support sPDCCH based on CRS demodulation to schedule sPDSCH based on DMRS demodulation, at this time, only sPDCCH based on DMRS demodulation can be used to schedule sPDSCH based on DMRS demodulation. On one hand, if the DMRS corresponding to the sPDCCH is different from the DMRS corresponding to the sPDSCH in Resource Element (RE), the system needs to transmit the DMRS dedicated for sPDCCH demodulation, thereby increasing the overhead of the reference signal. On the other hand, if the DMRS corresponding to the sPDCCH and the DMRS corresponding to the sPDSCH share the same resource unit, the resource utilization efficiency may be low, because if the sPDCCH and the sPDSCH use the same multi-input multi-output (MIMO) transmission mechanism, the sPDSCH may be limited to only use the transmission mechanism corresponding to the sPDCCH, so that the transmission mechanisms such as spatial multiplexing may not be used, and the resource utilization efficiency may be reduced, and the spectrum efficiency is specifically reduced. If the sPDCCH and the sPDSCH use different MIMO transmission mechanisms, on one hand, the transmission performance is affected because the sPDCCH and the sPDSCH use different DMRS antenna ports, which results in that the sPDCCH and the sPDSCH cannot use the maximum transmission power, and on the other hand, a more complex design is required to enable the sPDCCH and the sPDSCH to use different MIMO transmission mechanisms.
In addition, whether the DMRS used for sPDSCH demodulation is transmitted depends on whether the sPDSCH is scheduled, but it is not clear in the prior art whether the LTE system supporting sTTI supports the sPDCCH based on CRS demodulation for sPDCCH scheduling based on DMRS demodulation, and before the terminal device decodes the sPDCCH based on CRS demodulation, it is not clear whether the sPDCCH based on CRS demodulation schedules the sPDSCH based on DMRS demodulation, and thus it cannot be determined whether the sPDCCH carries a resource unit of the sPDCCH in the sPDCCH, which may result in that downlink control information carried by the sPDCCH cannot be successfully demodulated.
In order to solve the above problems, the present application provides a downlink control information transmission method, a terminal device, and a network device, which can enable sPDCCH based on CRS demodulation to schedule sPDSCH based on DMRS demodulation, and make it clear whether the sPDCCH carries the resource unit of the sPDCCH, thereby reducing the overhead of reference signals and improving the utilization rate of system resources.
The embodiments of the present application are mainly applied to an LTE system or an LTE evolved system, and are exemplified by being applied to a single carrier and multiple carriers. The network element related to the application mainly comprises terminal equipment and network equipment. Alternatively, the terminal device may refer to a user equipment, and the network device may refer to a base station.
Example one
Fig. 2 is an interaction diagram of a downlink control information transmission method according to a first embodiment of the present application. As shown in fig. 2, a method for transmitting downlink control information provided in an embodiment of the present application includes the following steps:
step 201: the network device sends the downlink control information through the downlink control channel.
And the downlink control channel is demodulated based on a cell reference signal CRS.
Optionally, the transmission time interval for carrying the downlink control channel in step 201 may be less than 1ms, and may be referred to as a short transmission time interval sTTI, where the length of the sTTI may be 2 time domain symbols, 3 time domain symbols, or 7 time domain symbols.
In this step, the network device sends downlink control information, where the downlink control information is carried by a downlink control channel, and the downlink control channel is demodulated based on a cell-specific reference signal (CRS), and the downlink control channel may be carried in a downlink control channel resource set.
Step 202: the network equipment sends a physical downlink shared channel scheduled by downlink control information.
The physical downlink shared channel is demodulated based on a demodulation reference signal (DMRS).
In this embodiment, optionally, the physical downlink shared channel in this embodiment may be an sPDSCH, and the transmission time interval for carrying the sPDSCH is a short transmission time interval sTTI.
In this step, the network device sends a physical downlink shared channel on the resource indicated by the downlink control information in step 201, where the physical downlink shared channel is demodulated based on a demodulation reference signal (DMRS).
Step 203: and the terminal equipment detects the downlink control channel demodulated based on the CRS.
In this step, the terminal device detects a downlink control channel demodulated based on the CRS, and acquires downlink control information carried on the downlink control channel.
Optionally, for a specific process of detecting the CRS demodulation-based downlink control channel by the terminal device, refer to the embodiments shown in fig. 3 to fig. 6 described below, which is not described herein again.
Step 204: and the terminal equipment decodes the physical downlink shared channel demodulated based on the demodulation reference signal DMRS according to the downlink control information loaded on the downlink control channel.
In step 204, the terminal device determines scheduling information corresponding to the physical downlink shared channel, for example, a time-frequency resource and a modulation and coding scheme corresponding to the physical downlink shared channel, according to the downlink control information carried by the downlink control channel detected in step 203, so as to decode the physical downlink shared channel.
Optionally, the transmission time interval for carrying the pdcch in step 204 may be smaller than 1ms, and may be referred to as a short transmission time interval sTTI, where the length of the sTTI may be 2 time domain symbols, 3 time domain symbols, or 7 time domain symbols, and the embodiment of the present application does not limit the specific length of the sTTI.
In the embodiments of the present application, unless otherwise specified, the sequence of the steps is not limited, and the interdependence relationship between the steps is not limited.
In the downlink control information transmission method provided in this embodiment, the network device sends the downlink control information through a downlink control channel, where the downlink control channel is demodulated based on CRS, and sends a physical downlink shared channel scheduled by the downlink control information, and the physical downlink shared channel is demodulated based on DMRS, and accordingly, the terminal device detects the downlink control channel demodulated based on CRS, and decodes the physical downlink shared channel demodulated based on DMRS according to the downlink control information carried on the downlink control channel, where transmission time intervals for carrying the downlink control channel and the physical downlink shared channel are both less than 1 millisecond. In the technical scheme, before demodulating sPDCCH based on CRS demodulation, the terminal equipment can clearly determine whether sPDCCH based on CRS demodulation schedules sDSCH based on DMRS demodulation, so that whether resource units for bearing DMRS used for sDSCH demodulation are included in time-frequency resources based on CRS demodulation can be determined, and the terminal equipment can successfully demodulate downlink control information borne by sPDCCH.
Example two
Fig. 3 is an interaction diagram of a downlink control information transmission method according to a second embodiment of the present application. The present embodiment is a further description of a downlink control information transmission method based on the embodiment shown in fig. 2. As shown in fig. 3, the method for transmitting downlink control information according to the embodiment of the present application further includes:
step 301: the network equipment sends first configuration information of a downlink control channel resource block set.
The downlink control channel resource block set is used for carrying a downlink control channel based on CRS demodulation, and the first configuration information is used for indicating the number of time domain symbols corresponding to the downlink control channel resource block set.
Optionally, when the number of time domain symbols corresponding to the downlink control channel resource block set is equal to the number of time domain symbols corresponding to the transmission time interval, the network device performs mapping from the control channel unit corresponding to the downlink control channel to the resource unit group according to a time-first and frequency-second rule.
Correspondingly, step 203, that is, the terminal device detects the downlink control channel demodulated based on the cell reference signal CRS, may include the following steps:
step 302: the terminal equipment receives first configuration information of a downlink control channel resource block set.
The downlink control channel resource block set is used for carrying a downlink control channel based on CRS demodulation, and the first configuration information is used for indicating the number of time domain symbols corresponding to the downlink control channel resource block set.
Optionally, the time domain symbol in this embodiment may be an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a single-carrier frequency-division multiple access (SC-FDMA) symbol.
Step 303: and the terminal equipment determines the number of time domain symbols corresponding to the downlink control channel resource block set according to the first configuration information.
Step 304: and the terminal equipment detects the downlink control channel demodulated based on the CRS according to the number of the time domain symbols corresponding to the downlink control channel resource block set.
Optionally, if the number of time domain symbols corresponding to the downlink control channel resource block set is smaller than the number of time domain symbols corresponding to the transmission time interval, when the terminal device detects a CRS-based demodulated downlink control channel, it is assumed that the time-frequency resource corresponding to the downlink control channel resource block set includes a resource unit corresponding to a DMRS for demodulating a physical downlink shared channel.
If the number of time domain symbols corresponding to the downlink control channel resource block set is equal to the number of time domain symbols corresponding to the transmission time interval, and the control channel units corresponding to the downlink control channel are mapped to the resource unit group according to the time-first and frequency-second rules, the terminal device assumes that the time-frequency resources corresponding to the downlink control channel resource block set do not include the resource units corresponding to the DMRS for demodulating the physical downlink shared channel when detecting the downlink control channel demodulated based on the CRS.
Optionally, in this embodiment of the present application, a control channel unit corresponding to a downlink control channel is mapped to a resource unit group according to a time-frequency rule, and may refer to a resource unit group that is mapped to all time domain symbols on a resource block 1 first, and then starts to be mapped to a resource unit group on a resource block 2, where a resource block index of the resource block 1 may be smaller than the resource unit group on the resource block 2.
If the number of time domain symbols corresponding to the downlink control channel resource block set is equal to the number of time domain symbols corresponding to the transmission time interval, and the control channel units corresponding to the downlink control channel are mapped to the resource unit group according to the rule of frequency first and time later, the terminal device assumes that the time-frequency resources corresponding to the downlink control channel resource block set include the resource units corresponding to the DMRS for demodulating the physical downlink shared channel when detecting the downlink control channel demodulated based on the CRS.
Optionally, a control channel unit corresponding to a downlink control channel in the embodiment of the present application is mapped to a resource unit group according to a rule of frequency first and time second, and may refer to a resource unit group mapped to all resource blocks on a time domain symbol 1 first and then start to map to a resource unit group on a time domain symbol 2, where a symbol index of the time domain symbol 1 may be smaller than a symbol index on the time domain symbol 2.
It should be noted that the control Channel element in the embodiment of the present application may be a cce (control Channel element), and may also be referred to as sCCE. When the control channel element is sCCE, it may refer to a control channel element corresponding to sPDCCH. The resource Element group in the embodiment of the present application may be a reg (resource Element group), which may also be referred to as sREG. When the resource element group is sREG, it may refer to a resource element group corresponding to the sPDCCH.
In the downlink control information transmission method provided in the embodiment of the present application, when a network device sends first configuration information of a downlink control channel resource block set, where the downlink control channel resource block set is used to carry a downlink control channel, and the first configuration information is used to indicate the number of time domain symbols corresponding to the downlink control channel resource block set, a terminal device may detect a downlink control channel demodulated based on a cell reference signal CRS in a manner that the terminal device receives the first configuration information of the downlink control channel resource block set, determines the number of time domain symbols corresponding to the downlink control channel resource block set according to the first configuration information, and detects the downlink control channel according to the number of time domain symbols corresponding to the downlink control channel resource block set. By the mode, the method and the device solve the ambiguity problem of existence of the DMRS in the process of demodulating the sPDCCH, enable the sPDCCH based on CRS demodulation to schedule the sPDSCH based on DMRS demodulation, thereby avoiding the defect that the sPDCCH based on DMRS demodulation can only be used for scheduling the sPDSCH based on DMRS demodulation in the prior art, avoiding the need of specially transmitting the specific DMRS for the sPDCCH demodulation, reducing the reference signal overhead, and avoiding the defect that the resource utilization rate is reduced due to the limitation of a transmission mechanism of the sPDSCH caused by the need of sharing DMRS resource units by the sPDCCH and the sPDSCH, thereby improving the resource utilization rate and the spectrum efficiency.
EXAMPLE III
Fig. 4 is an interaction diagram of a third embodiment of a downlink control information transmission method according to the embodiment of the present application. The present embodiment is a further description of a downlink control information transmission method based on the embodiment shown in fig. 2. As shown in fig. 4, in the downlink control information transmission method provided in the embodiment of the present application, step 203, in which the terminal device detects the downlink control channel demodulated based on the cell reference signal CRS, may include the following steps:
step 401: and the terminal equipment determines the number of time domain symbols of a downlink control channel detection region corresponding to the downlink control channel demodulated based on the CRS.
Step 402: the terminal equipment detects the downlink control channel according to the time domain symbol number of the downlink control channel detection area corresponding to the downlink control channel.
Optionally, if the number of time domain symbols in the downlink control channel detection region corresponding to the CRS-based demodulated downlink control channel is smaller than the number of time domain symbols corresponding to the transmission time interval, it is assumed that the time-frequency resource corresponding to the downlink control channel resource block set includes a resource unit corresponding to a DMRS for demodulating a physical downlink shared channel when the terminal device detects the CRS-based demodulated downlink control channel.
If the number of time domain symbols of the downlink control channel detection region corresponding to the downlink control channel based on CRS demodulation is equal to the number of time domain symbols corresponding to the transmission time interval, and the control channel unit corresponding to the downlink control channel is mapped to the resource unit group according to the rule of time first and frequency second, it is assumed that the time-frequency resource corresponding to the downlink control channel resource block set does not include the resource unit corresponding to the DMRS for demodulating the physical downlink shared channel when the terminal device detects the downlink control channel based on CRS demodulation.
If the number of time domain symbols of the downlink control channel detection region corresponding to the downlink control channel based on CRS demodulation is equal to the number of time domain symbols corresponding to the transmission time interval, and the control channel unit corresponding to the downlink control channel is mapped to the resource unit group according to the rule of frequency first and time later, the terminal device assumes that the time-frequency resource corresponding to the downlink control channel resource block set includes the resource unit corresponding to the DMRS for demodulating the physical downlink shared channel when detecting the downlink control channel based on CRS demodulation.
In the downlink control information transmission method provided in the embodiment of the present application, when a terminal device detects a downlink control channel demodulated based on a cell reference signal CRS, the terminal device detects the downlink control channel demodulated based on the CRS by determining the number of time domain symbols of a downlink control channel detection region corresponding to the downlink control channel and according to the number of time domain symbols of the downlink control channel detection region corresponding to the downlink control channel. The technical scheme can also enable the sPDCCH based on CRS demodulation to schedule the sPDSCH based on DMRS demodulation, can obtain higher transmission performance than the sPDCCH based on DMRS demodulation, and improves the transmission reliability of the sPDCCH.
Example four
Fig. 5 is an interaction diagram of a fourth embodiment of a downlink control information transmission method according to the embodiment of the present application. The present embodiment is a further description of a downlink control information transmission method based on the embodiment shown in fig. 2. As shown in fig. 5, the method for transmitting downlink control information according to the embodiment of the present application further includes the following steps:
step 501: and the network equipment sends a high-level signaling, wherein the high-level signaling is used for indicating the terminal equipment to detect the downlink control channel according to the first detection mode or the second detection mode.
Step 502: and the terminal equipment receives the high-level signaling.
Step 503: and the terminal equipment detects the downlink control channel based on CRS demodulation according to the high-level signaling.
Optionally, if the high-level signaling indicates that the terminal device detects the CRS-demodulation-based downlink control channel according to the first detection mode, it is assumed that a control channel region corresponding to the CRS-demodulation-based downlink control channel includes a resource element corresponding to a DMRS for demodulating a physical downlink shared channel when the terminal device detects the CRS-demodulation-based downlink control channel.
And if the high-level signaling indicates that the terminal equipment detects the CRS-demodulation-based downlink control channel according to a second detection mode, the terminal equipment assumes that a control channel region corresponding to the CRS-demodulation-based downlink control channel does not include a resource unit corresponding to a DMRS (demodulation reference signal) for demodulating a physical downlink shared channel when detecting the CRS-demodulation-based downlink control channel.
Optionally, when the sPDSCH may exist in the control channel region corresponding to the sPDCCH, the high layer signaling instruction detects the CRS demodulation-based downlink control channel according to a first detection method, and when the sPDSCH does not exist in the control channel region corresponding to the sPDCCH, the high layer signaling instruction detects the CRS demodulation-based downlink control channel according to a second detection method.
According to the downlink control information transmission method provided by the embodiment of the application, when the network equipment sends the high-level signaling, and the high-level signaling is used for indicating the terminal equipment to detect the downlink control channel according to the first detection mode or the second detection mode, the terminal equipment detects the downlink control channel based on CRS demodulation according to the received high-level signaling. According to the technical scheme, the network equipment can flexibly change between the first detection mode and the second detection mode according to the actual situation, and can be matched with the actual application situation, so that the resource utilization efficiency is improved.
EXAMPLE five
Fig. 6 is an interaction diagram of a fifth embodiment of a downlink control information transmission method provided in the embodiment of the present application. The present embodiment is a further description of a downlink control information transmission method based on the embodiment shown in fig. 2. As shown in fig. 6, the method for transmitting downlink control information according to the embodiment of the present application further includes the following steps:
step 601: and the network equipment sends second configuration information of the downlink control channel resource block set.
And the downlink control channel is borne on the time-frequency resource corresponding to the downlink control channel resource block set. In this embodiment, the second configuration information is used to instruct the terminal device to detect the CRS demodulation-based downlink control channel according to the first detection method or the second detection method.
Optionally, in another embodiment, the method further includes: the network equipment sends first configuration information of a downlink control channel resource block set. The first configuration information is used for indicating the number of time domain symbols corresponding to the downlink control channel resource block set.
Step 602: and the terminal equipment receives second configuration information of the downlink control channel resource block set.
Optionally, when the network device further sends the first configuration information of the downlink control channel resource block set, correspondingly, the terminal device further receives the first configuration information of the downlink control channel resource block set, and determines the number of time domain symbols corresponding to the downlink control channel resource block set according to the first configuration information.
Step 603: and the terminal equipment detects the downlink control channel demodulated based on the CRS according to the second configuration information.
Optionally, if the second configuration information indicates that the terminal device detects the CRS demodulation-based downlink control channel according to the first detection mode, it is assumed that the time-frequency resource corresponding to the downlink control channel resource block set includes a resource element corresponding to a DMRS used for demodulating a physical downlink shared channel when the terminal device detects the CRS demodulation-based downlink control channel.
If the second configuration information indicates that the terminal device detects the CRS demodulation-based downlink control channel according to the second detection mode, it is assumed that the time-frequency resource corresponding to the downlink control channel resource block set does not include the resource element corresponding to the DMRS for demodulating the physical downlink shared channel when the terminal device detects the CRS demodulation-based downlink control channel.
Optionally, when the terminal device receives the first configuration information and the second configuration information of the downlink control channel resource block set, the terminal device detects the downlink control channel based on CRS demodulation according to the number of time domain symbols corresponding to the downlink control channel resource block set and the second configuration information, and the specific implementation manner is as follows:
if the number of time domain symbols corresponding to the downlink control channel resource block set is smaller than the number of time domain symbols corresponding to the transmission time interval, the terminal device assumes that the time-frequency resource corresponding to the downlink control channel resource block set comprises a resource unit corresponding to a DMRS for demodulating a physical downlink shared channel when detecting a downlink control channel demodulated based on CRS.
And if the number of the time domain symbols corresponding to the downlink control channel resource block set is equal to the number of the time domain symbols corresponding to the transmission time interval, the terminal equipment detects the downlink control channel based on CRS demodulation according to the second configuration information.
For a specific implementation process of the terminal device detecting the CRS demodulation-based downlink control channel according to the second configuration information, refer to the foregoing part of this step, and details are not described here.
It should be noted that, in the LTE system supporting sTTI, the network device may integrate the second configuration information and/or the first configuration information of the downlink control channel resource block set into one information packet to be issued, where the information packet may be collectively referred to as the configuration information of the downlink control channel resource block set.
The method for transmitting downlink control information provided by the embodiment of the application sends the second configuration information and/or the first configuration information of the downlink control channel resource block set at the network equipment, and the downlink control channel is carried on the time frequency resource corresponding to the downlink control channel resource block set, the second configuration information is used for instructing the terminal device to detect the downlink control channel demodulated based on the CRS according to the first detection mode or the second detection mode, the first configuration information is used for indicating the number of time domain symbols corresponding to the downlink control channel resource block set, the terminal device thus receives the second configuration information and/or the first configuration information of the set of downlink control channel resource blocks, determining the number of time domain symbols corresponding to the downlink control channel resource block set according to the first configuration information, and detecting the downlink control channel based on CRS demodulation according to the number of time domain symbols corresponding to the downlink control channel resource block set and the second configuration information. The technical scheme can also enable the sPDCCH based on CRS demodulation to schedule the sPDSCH based on DMRS demodulation, can obtain higher transmission performance than the sPDCCH based on DMRS demodulation, and improves the transmission reliability of the sPDCCH.
EXAMPLE six
In this embodiment, the terminal device detects the downlink control channel demodulated based on the cell reference signal CRS, and may be implemented by the following implementation manner:
when the terminal device detects the downlink control channel demodulated based on the CRS, it is assumed that a control channel region corresponding to the downlink control channel demodulated based on the CRS includes resource elements corresponding to a DMRS used for demodulating a physical downlink shared channel.
The transmission time interval for carrying the downlink control channel in this step may be less than 1ms, and may be referred to as a short transmission time interval sTTI, where the length of the sTTI may be 2 time domain symbols, 3 time domain symbols, or 7 time domain symbols.
In the embodiment of the application, when the downlink control channel based on CRS demodulation is detected by the terminal equipment, the control channel region corresponding to the downlink control channel based on CRS demodulation is assumed to comprise the resource unit corresponding to the DMRS used for demodulating the physical downlink shared channel, the problem that whether the DMRS exists is not clear in the process of sPDCCH demodulation is solved, the sPDCCH based on CRS demodulation is enabled to schedule the sPDSCH based on the DMRS demodulation, and the defect that the resource utilization rate is reduced due to the limitation of a transmission mechanism of the sPDSCH caused by the need of the sPDCCH and the sPDSCH for sharing the DMRS resource unit is avoided, so that the resource utilization rate is improved, the spectrum efficiency is improved, in addition, the sPDCCH based on CRS demodulation is adopted, the higher transmission performance of the DMRS compared with the sPDCCH based on CRS demodulation.
EXAMPLE seven
Fig. 7 is an interaction diagram of a seventh embodiment of a downlink control information transmission method according to an embodiment of the present application. As shown in fig. 7, a method for transmitting downlink control information provided in this embodiment of the present application includes the following steps:
step 701: the network equipment sends the downlink control information.
In this step, optionally, the network device sends the downlink control information through a first downlink control channel resource block set in a non-multicast/multicast single frequency network (MBSFN) subframe, and the network device sends the downlink control information through a second downlink control channel resource set in the MBSFN subframe.
Or
The network equipment sends downlink control information through a first downlink control channel resource block set in a non-MBSFN subframe, the network equipment sends the downlink control information through a second downlink control channel resource set in a first short transmission time interval (sTTI) of the MBSFN subframe, and the network equipment sends the downlink control information through the second downlink control channel resource set in other sTTI except the first short transmission time interval (sTTI) of the MBSFN subframe.
Step 702: and the network equipment sends the physical downlink shared channel scheduled by the downlink control information.
In this step, the network device transmits the physical downlink shared channel on the resource indicated by the downlink control information in step 701.
When the network device sends the downlink control information through the first downlink control channel resource block set in step 701, the physical downlink shared channel may be a physical downlink shared channel demodulated based on a CRS, or may also be a physical downlink shared channel demodulated based on a DMRS, depending on a configured transmission mode; when the network device sends the downlink control information through the second downlink control channel resource block set in step 701, the physical downlink shared channel may be a physical downlink shared channel based on DMRS demodulation.
Step 703: and the terminal equipment detects the downlink control channel.
Optionally, in this step, the terminal device may detect the downlink control channel in the following manner (7-1), specifically:
the terminal equipment detects a downlink control channel demodulated based on a cell reference signal CRS in a non-MBSFN subframe, and detects a downlink control channel demodulated based on a demodulation reference signal DMRS in the MBSFN subframe.
Alternatively, the first and second electrodes may be,
the terminal equipment detects a downlink control channel demodulated based on a cell reference signal CRS in a non-MBSFN subframe, detects the downlink control channel demodulated based on the CRS in a first short transmission time interval (sTTI) of the MBSFN subframe, and detects the downlink control channel demodulated based on a demodulation reference signal DMRS in other sTTI except the first short transmission time interval (sTTI) of the MBSFN subframe.
It should be noted that, in the LTE system and the LTE evolved system, CRS may exist only in the first time domain symbol and the second time domain symbol of the MBSFN subframe, and therefore, CRS does not exist in the sTTI of the MBSFN subframe except the first sTTI, and therefore, the terminal device needs to switch between the sPDCCH based on CRS demodulation and the sPDCCH based on DMRS demodulation, and by this way, the user equipment can be scheduled in each subframe, thereby reducing service delay.
Optionally, in this step, the terminal device may detect the downlink control channel in the following manner (7-2), specifically:
the terminal equipment detects a downlink control channel demodulated based on a cell reference signal CRS in both a non-MBSFN subframe and an MBSFN subframe;
alternatively, the first and second electrodes may be,
and the terminal equipment detects the downlink control channel demodulated based on the demodulation reference signal DMRS in both the non-MBSFN subframe and the MBSFN subframe.
By the method, the terminal equipment can be scheduled in each subframe, so that the service delay is reduced; meanwhile, the terminal equipment only needs to detect the sPDCCH based on CRS demodulation or the sPDCCH based on DMRS demodulation at least within a period of time, and does not need to switch between the two sPDCCHs, so that the complexity is reduced.
Optionally, the transmission time interval for carrying the downlink control channel in this step may be less than 1ms, and may be referred to as a short transmission time interval sTTI, where the length of the sTTI may be 2 time domain symbols, 3 time domain symbols, or 7 time domain symbols
Step 704: and the terminal equipment decodes the physical downlink shared channel according to the downlink control information carried on the downlink control channel.
In this step, when the terminal device detects the sPDCCH demodulated based on the CRS in step 703, the physical downlink shared channel may be a physical downlink shared channel demodulated based on the CRS, or may be a physical downlink shared channel demodulated based on the DMRS, which depends on the configured transmission mode; when the terminal device detects the sPDCCH demodulated based on the DMRS in step 703, the physical downlink shared channel may be a physical downlink shared channel demodulated based on the DMRS.
The transmission time interval for carrying the pdcch in this step may be less than 1ms, and may be referred to as a short transmission time interval sTTI, where the length of the sTTI may be 2 time domain symbols, 3 time domain symbols, or 7 time domain symbols.
Step 705: and the network equipment sends third configuration information of the downlink control channel resource block set.
The third configuration information of the downlink control channel resource block set indicates configuration information of a first downlink control channel resource block set and configuration information of a second downlink control channel resource block set, the first downlink control channel resource block set is used for bearing a downlink control channel based on CRS demodulation, and the second downlink control channel resource block set is used for bearing a downlink control channel based on DMRS demodulation.
Optionally, in this embodiment, when the mode (7-1) is adopted in step 703, this step 705 is adopted in this embodiment. At this time, the mode (7-1) in step 703 in the present embodiment may further be:
the terminal equipment receives third configuration information of a downlink control channel resource block set, wherein the third configuration information of the downlink control channel resource block set indicates configuration information of a first downlink control channel resource block set and configuration information of a second downlink control channel resource block set, the first downlink control channel resource block set is used for bearing a downlink control channel based on CRS demodulation, and the second downlink control channel resource block set is used for bearing a downlink control channel based on DMRS demodulation.
The terminal equipment detects a downlink control channel demodulated based on a Cell Reference Signal (CRS) on the basis of a first downlink control channel resource block set in a non-MBSFN subframe, and detects a downlink control channel demodulated based on a demodulation reference signal (DMRS) on the basis of a second downlink control channel resource block set in the MBSFN subframe;
alternatively, the first and second electrodes may be,
the terminal equipment detects a CRS demodulation-based downlink control channel on the basis of a first downlink control channel resource block set in a non-MBSFN subframe, and detects a CRS demodulation-based downlink control channel on the basis of the first downlink control channel resource block set in a first short transmission time interval (sTTI) of the MBSFN subframe; and detecting the downlink control channel demodulated based on the demodulation reference signal DMRS based on the second downlink control channel resource block set in other sTTI except the first short transmission time interval sTTI of the MBSFN subframe.
In the embodiments of the present application, unless otherwise specified, the sequence of the steps is not limited, and the interdependence relationship between the steps is not limited.
In the method for transmitting downlink control information provided in the embodiment of the present application, the network device sends the downlink control information and a physical downlink shared channel scheduled by the downlink control information, the terminal device detects the downlink control channel and decodes the physical downlink shared channel according to the downlink control information carried on the downlink control channel, and the network device also sends third configuration information of a downlink control channel resource block set, so that the terminal device can be scheduled in each subframe, thereby reducing service delay.
Fig. 8 is a schematic structural diagram of a terminal device according to an embodiment of the present application. As shown in fig. 8, the terminal device of this embodiment may include: a detection unit 801 and a processing unit 802.
The detecting unit 801 is configured to detect a downlink control channel demodulated based on a cell reference signal CRS.
The processing unit 802 is configured to decode a physical downlink shared channel demodulated based on a demodulation reference signal DMRS according to downlink control information carried on the downlink control channel;
and the transmission time interval for bearing the downlink control channel and the physical downlink shared channel is less than 1 millisecond.
Optionally, in an embodiment, the detecting unit 801 is configured to detect a downlink control channel demodulated based on a cell reference signal CRS, and specifically includes:
the detecting unit 801 is specifically configured to receive first configuration information of a downlink control channel resource block set, where the downlink control channel resource block set is used to carry the downlink control channel, the first configuration information is used to indicate the number of time domain symbols corresponding to the downlink control channel resource block set, determine the number of time domain symbols corresponding to the downlink control channel resource block set according to the first configuration information, and detect the downlink control channel according to the number of time domain symbols corresponding to the downlink control channel resource block set;
the detecting unit 801 is configured to detect the downlink control channel according to the number of time domain symbols corresponding to the downlink control channel resource block set, and specifically includes:
the detecting unit 801 is specifically configured to assume, when detecting the downlink control channel, that the time-frequency resource corresponding to the downlink control channel resource block set includes a resource unit corresponding to a DMRS used for demodulating a physical downlink shared channel, if the number of time-domain symbols corresponding to the downlink control channel resource block set is less than the number of time-domain symbols corresponding to the transmission time interval, and if the number of time-domain symbols corresponding to the downlink control channel resource block set is equal to the number of time-domain symbols corresponding to the transmission time interval, and the control channel unit corresponding to the downlink control channel is mapped to the resource unit group according to a time-first and frequency-second rule, assume, when detecting the downlink control channel, that the time-frequency resource corresponding to the downlink control channel resource block set does not include a resource unit corresponding to a DMRS used for demodulating a physical downlink shared channel, and if the number of time-domain symbols corresponding to the downlink control channel resource block set is equal to the number And the number of symbols is determined, and the control channel unit corresponding to the downlink control channel is mapped to the resource unit group according to the rule of first frequency and then time, so that the time-frequency resource corresponding to the downlink control channel resource block set is assumed to comprise the resource unit corresponding to the DMRS for demodulating the physical downlink shared channel when the downlink control channel is detected.
Optionally, in another embodiment, the detecting unit 801 is configured to detect a downlink control channel demodulated based on a cell reference signal CRS, and specifically includes:
the detecting unit 801 is specifically configured to determine the number of time domain symbols in a downlink control channel detection region corresponding to the downlink control channel, and detect the downlink control channel according to the number of time domain symbols in the downlink control channel detection region corresponding to the downlink control channel;
the detecting unit 801 is configured to detect the downlink control channel according to the number of time domain symbols in the downlink control channel detection region corresponding to the downlink control channel, and specifically includes:
the detecting unit 801 is specifically configured to, if the number of time domain symbols of a downlink control channel detection region corresponding to the downlink control channel is smaller than the number of time domain symbols corresponding to the transmission time interval, assume that time-frequency resources corresponding to the downlink control channel resource block set include resource units corresponding to DMRS used for demodulating a physical downlink shared channel when detecting the downlink control channel, and assume that the time-frequency resources corresponding to the downlink control channel resource block set do not include resource units corresponding to DMRS used for demodulating a physical downlink shared channel when detecting the downlink control channel if the number of time domain symbols of the downlink control channel detection region corresponding to the downlink control channel is equal to the number of time domain symbols corresponding to the transmission time interval and the control channel units corresponding to the downlink control channel are mapped to a resource unit group according to a time-frequency rule and a frequency-frequency rule, and if the number of time domain symbols of the downlink control channel detection region corresponding to the downlink control channel is equal to the number of time domain symbols corresponding to the transmission time interval, and the control channel unit corresponding to the downlink control channel is mapped to the resource unit group according to the rule of frequency first and time later, assuming that the time-frequency resource corresponding to the downlink control channel resource block set comprises the resource unit corresponding to the DMRS for demodulating the physical downlink shared channel when the downlink control channel is detected.
Optionally, in another embodiment, the detecting unit 801 is configured to detect a downlink control channel demodulated based on a cell reference signal CRS, and specifically includes:
the detecting unit 801 is specifically configured to receive a high-level signaling, where the high-level signaling is used to instruct the terminal device to detect the downlink control channel according to a first detection manner or a second detection manner, and detect the downlink control channel according to the high-level signaling;
the detecting unit 801 is configured to detect the downlink control channel according to the high-level signaling, and specifically includes:
the detecting unit 801 is specifically configured to assume that a control channel region corresponding to the downlink control channel includes a resource unit corresponding to a DMRS used for demodulating a physical downlink shared channel when the downlink control channel is detected if the high-level signaling indicates that the terminal device detects the downlink control channel according to a first detection method, and assume that the control channel region corresponding to the downlink control channel does not include the resource unit corresponding to the DMRS used for demodulating the physical downlink shared channel when the downlink control channel is detected if the high-level signaling indicates that the terminal device detects the downlink control channel according to a second detection method.
Optionally, in another embodiment, the detecting unit 801 is configured to detect a downlink control channel demodulated based on a cell reference signal CRS, and specifically includes:
the detecting unit 801 is specifically configured to receive second configuration information of a downlink control channel resource block set, where the downlink control channel is carried on a time-frequency resource corresponding to the downlink control channel resource block set, and the second configuration information is used to instruct the terminal device to detect the downlink control channel according to a first detection method or a second detection method, and detect the downlink control channel according to the second configuration information;
the detecting unit 801 is configured to detect the downlink control channel according to the second configuration information, and specifically includes:
the detecting unit 801 is specifically configured to assume that, when detecting the downlink control channel, the time-frequency resource corresponding to the downlink control channel resource block set includes a resource unit corresponding to a DMRS used for demodulating a physical downlink shared channel, if the second configuration information indicates that the terminal device detects the downlink control channel according to a first detection manner, and assume that, when detecting the downlink control channel, the time-frequency resource corresponding to the downlink control channel resource block set does not include a resource unit corresponding to a DMRS used for demodulating a physical downlink shared channel, if the second configuration information indicates that the terminal device detects the downlink control channel according to a second detection manner.
Optionally, in the foregoing embodiment, the detecting unit 801 is further specifically configured to receive first configuration information of a downlink control channel resource block set, where the first configuration information is used to indicate the number of time domain symbols corresponding to the downlink control channel resource block set, determine the number of time domain symbols corresponding to the downlink control channel resource block set according to the first configuration information, and detect the downlink control channel according to the number of time domain symbols corresponding to the downlink control channel resource block set and the second configuration information.
The detecting unit 801 is configured to detect the downlink control channel according to the number of time domain symbols corresponding to the downlink control channel resource block set and the second configuration information, and specifically includes:
the detecting unit 801 is specifically configured to, if the number of time domain symbols corresponding to the downlink control channel resource block set is smaller than the number of time domain symbols corresponding to the transmission time interval, assume that the time-frequency resource corresponding to the downlink control channel resource block set includes a resource unit corresponding to a DMRS used for demodulating a physical downlink shared channel when detecting the downlink control channel, and if the number of time domain symbols corresponding to the downlink control channel resource block set is equal to the number of time domain symbols corresponding to the transmission time interval, detect the downlink control channel according to the second configuration information.
Optionally, in another embodiment, the detecting unit 801 is configured to detect a downlink control channel demodulated based on a cell reference signal CRS, and specifically includes:
the detecting unit 801 is specifically configured to assume that, when detecting the downlink control channel, a control channel region corresponding to the downlink control channel includes a resource unit corresponding to a DMRS for demodulating a physical downlink shared channel.
Optionally, in another embodiment, the detecting unit 801 is configured to detect a downlink control channel demodulated based on a cell reference signal CRS, and specifically includes:
the detecting unit 801 is specifically configured to detect a downlink control channel demodulated based on CRS in a non-multicast/multicast single frequency network MBSFN subframe, and detect a downlink control channel demodulated based on DMRS in an MBSFN subframe.
The terminal device of this embodiment may be configured to execute the implementation schemes of the terminal device in the method embodiments shown in fig. 2 to fig. 7, and specific implementation manners and technical effects are similar and will not be described again here.
Fig. 9 is a schematic structural diagram of a network device according to an embodiment of the present application. As shown in fig. 9, the network device of this embodiment may include: a transmitting unit 901.
The sending unit 901 is configured to send downlink control information through a downlink control channel, where the downlink control channel is demodulated based on a cell reference signal CRS, and sends a physical downlink shared channel scheduled by the downlink control information, and the physical downlink shared channel is demodulated based on a demodulation reference signal DMRS;
and the transmission time interval for bearing the downlink control channel and the physical downlink shared channel is less than 1 millisecond.
Optionally, in an embodiment of the present application, the sending unit 901 is further configured to send first configuration information of a downlink control channel resource block set, where the downlink control channel resource block set is used to carry the downlink control channel, and the first configuration information is used to indicate the number of time domain symbols corresponding to the downlink control channel resource block set;
optionally, in this embodiment, the network device further includes: a processing unit 902.
The processing unit 902 is configured to perform mapping from a control channel unit corresponding to the downlink control channel to a resource unit group according to a time-first and frequency-second rule when the number of time domain symbols corresponding to the downlink control channel resource block set is equal to the number of time domain symbols corresponding to the transmission time interval.
Optionally, in another embodiment of the present application, the sending unit 901 is further configured to send a higher layer signaling, where the higher layer signaling is used to instruct a terminal device to detect the downlink control channel according to a first detection manner or a second detection manner.
Optionally, in another embodiment of the present application, the sending unit 901 is further configured to send second configuration information of a downlink control channel resource block set, where the downlink control channel is carried on a time-frequency resource corresponding to the downlink control channel resource block set, and the second configuration information is used to instruct the terminal device to detect the downlink control channel according to a first detection manner or a second detection manner.
Optionally, in another embodiment of the present application, the sending unit 901 is further configured to send third configuration information of a downlink control channel resource block set, where the third configuration information is used to indicate configuration information of a first downlink control channel resource block set and configuration information of a second downlink control channel resource block set, the first downlink control channel resource block set is used to carry a downlink control channel based on CRS demodulation, and the second downlink control channel resource block set is used to carry a downlink control channel based on DMRS demodulation.
Optionally, in this embodiment, the sending unit 901 is configured to send downlink control information through a downlink control channel, and specifically includes:
the sending unit 901 is specifically configured to send the downlink control information through the first downlink control channel resource block set in a non-MBSFN subframe, and send the downlink control information through the second downlink control channel resource set in an MBSFN subframe.
The network device of this embodiment may be used to execute the implementation schemes of the network devices in the method embodiments shown in fig. 2 to fig. 7, and the specific implementation manners and technical effects are similar and will not be described again here.
It should be noted that the division of each unit of the above devices (network device and terminal device) is only a logical division, and the actual implementation may be wholly or partially integrated into one physical entity, or may be physically separated. And these units can be implemented entirely in software, invoked by a processing element; or may be implemented entirely in hardware; and part of the units can be realized in the form of calling software by the processing element, and part of the units can be realized in the form of hardware. For example, the processing unit may be a processing element that is set up separately, or may be implemented by being integrated into a chip of the apparatus, or may be stored in a memory of the apparatus in the form of program code, and a function of the processing unit may be called and executed by a processing element of the apparatus. The other units are implemented similarly. In addition, all or part of the units can be integrated together or can be independently realized. The processing element described herein may be an integrated circuit having signal processing capabilities. In implementation, the steps of the method or the units above may be implemented by hardware integrated logic circuits in a processor element or instructions in software.
For example, the above units may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), or one or more Digital Signal Processors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), etc. For another example, when some of the above units are implemented in the form of a processing element scheduler code, the processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor that can call the program code. As another example, these units may be integrated together and implemented in the form of a system-on-a-chip (SOC).
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium, (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
Fig. 10 is a schematic structural diagram of another terminal device according to an embodiment of the present application. As shown in fig. 10, the terminal device provided in this example includes: a processor 1001 and a transceiver 1002. Optionally, the terminal device may further include a memory for storing instructions executed by the processor 1001. Alternatively, the transceiver 1002 may be implemented by a transmitter and a receiver with independent functions, both of which may be implemented in the form of an antenna, etc., and the embodiment of the present application is not limited thereto. The processor 1001 is configured to execute computer executable instructions to enable the terminal device to perform the steps applied to the terminal device in the downlink control information transmission method.
Specifically, in fig. 8, the detection unit 901 and the processing unit 902 correspond to the processor 1001 and the like.
Fig. 11 is a schematic structural diagram of another network device according to an embodiment of the present application. As shown in fig. 11, the network device provided in this example includes: a processor 1101 and a transceiver 1102. Optionally, the network device may further comprise a memory for storing instructions for execution by the processor 1101. Alternatively, the transceiver 1102 may be implemented by a transmitter and a receiver with independent functions, both of which may be implemented in the form of an antenna, etc., and the embodiment of the present application is not limited thereto. The processor 1101 and the transceiver 1102 are configured to execute computer-executable instructions to cause the network device to perform the steps as applied to the network device in the downlink control information transmission method.
Specifically, in fig. 9, the transmitting unit 901 corresponds to the transceiver 1102, and the processing unit 902 corresponds to the processor 1101 or the like.
Further, fig. 12 is a schematic structural diagram of a communication system according to an embodiment of the present application. As shown in fig. 12, the communication system provided in this embodiment includes: terminal device 1201 and network device 1202.
The terminal device 1201 is the terminal device in the embodiment shown in fig. 8 or the terminal device in the embodiment shown in fig. 10, and the network device 1202 is the network device in the embodiment shown in fig. 9 or the network device in the embodiment shown in fig. 11. For specific implementation schemes and beneficial effects of the terminal device and the network device, reference is made to the descriptions in fig. 8 and 9 or fig. 10 and 11, which are not described herein again.

Claims (30)

  1. A method for transmitting downlink control information is characterized by comprising the following steps:
    the terminal equipment detects a downlink control channel demodulated based on a cell reference signal CRS;
    the terminal equipment decodes a physical downlink shared channel demodulated based on a demodulation reference signal (DMRS) according to downlink control information carried on the downlink control channel;
    and the transmission time interval for bearing the downlink control channel and the physical downlink shared channel is less than 1 millisecond.
  2. The method of claim 1, wherein the detecting, by the terminal device, the downlink control channel demodulated based on a Cell Reference Signal (CRS) comprises:
    the terminal equipment receives first configuration information of a downlink control channel resource block set, wherein the downlink control channel resource block set is used for bearing a downlink control channel, and the first configuration information is used for indicating the number of time domain symbols corresponding to the downlink control channel resource block set;
    the terminal equipment determines the number of time domain symbols corresponding to the downlink control channel resource block set according to the first configuration information;
    and the terminal equipment detects the downlink control channel according to the number of the time domain symbols corresponding to the downlink control channel resource block set.
  3. The method of claim 2, wherein the detecting, by the terminal device, the downlink control channel according to the number of time domain symbols corresponding to the downlink control channel resource block set comprises:
    if the number of time domain symbols corresponding to the downlink control channel resource block set is smaller than the number of time domain symbols corresponding to the transmission time interval, the terminal device assumes that the time-frequency resources corresponding to the downlink control channel resource block set include resource units corresponding to a DMRS for demodulating a physical downlink shared channel when detecting the downlink control channel;
    if the number of time domain symbols corresponding to the downlink control channel resource block set is equal to the number of time domain symbols corresponding to the transmission time interval, and the control channel units corresponding to the downlink control channel are mapped to the resource unit group according to the time-first and frequency-second rule, the terminal device assumes that the time-frequency resources corresponding to the downlink control channel resource block set do not include the resource units corresponding to the DMRS for demodulating the physical downlink shared channel when detecting the downlink control channel;
    if the number of time domain symbols corresponding to the downlink control channel resource block set is equal to the number of time domain symbols corresponding to the transmission time interval, and the control channel units corresponding to the downlink control channel are mapped to the resource unit group according to the rule of frequency first and time later, the terminal device assumes that the time-frequency resources corresponding to the downlink control channel resource block set include the resource units corresponding to the DMRS for demodulating the physical downlink shared channel when detecting the downlink control channel.
  4. The method of claim 1, wherein the detecting, by the terminal device, the downlink control channel demodulated based on a Cell Reference Signal (CRS) comprises:
    the terminal equipment determines the number of time domain symbols of a downlink control channel detection region corresponding to the downlink control channel;
    the terminal equipment detects the downlink control channel according to the time domain symbol number of a downlink control channel detection region corresponding to the downlink control channel;
    the terminal device detects the downlink control channel according to the number of time domain symbols of a downlink control channel detection region corresponding to the downlink control channel, and the method comprises the following steps:
    if the number of time domain symbols in the downlink control channel detection region corresponding to the downlink control channel is smaller than the number of time domain symbols corresponding to the transmission time interval, the terminal device assumes that the time-frequency resource corresponding to the downlink control channel resource block set includes a resource unit corresponding to a DMRS for demodulating a physical downlink shared channel when detecting the downlink control channel;
    if the number of time domain symbols in the downlink control channel detection region corresponding to the downlink control channel is equal to the number of time domain symbols corresponding to the transmission time interval, and the control channel unit corresponding to the downlink control channel is mapped to the resource unit group according to the time-first and frequency-second rule, the terminal device assumes that the time-frequency resource corresponding to the downlink control channel resource block set does not include the resource unit corresponding to the DMRS for demodulating the physical downlink shared channel when detecting the downlink control channel;
    if the number of time domain symbols in the downlink control channel detection region corresponding to the downlink control channel is equal to the number of time domain symbols corresponding to the transmission time interval, and the control channel unit corresponding to the downlink control channel is mapped to the resource unit group according to the rule of frequency first and time later, the terminal device assumes that the time-frequency resource corresponding to the downlink control channel resource block set includes the resource unit corresponding to the DMRS for demodulating the physical downlink shared channel when detecting the downlink control channel.
  5. The method of claim 1, wherein the detecting, by the terminal device, the downlink control channel demodulated based on a Cell Reference Signal (CRS) comprises:
    the terminal equipment receives a high-level signaling, wherein the high-level signaling is used for indicating the terminal equipment to detect the downlink control channel according to a first detection mode or a second detection mode;
    the terminal equipment detects the downlink control channel according to the high-level signaling;
    the detecting, by the terminal device, the downlink control channel according to the high-level signaling includes:
    if the high-level signaling indicates that the terminal equipment detects the downlink control channel according to a first detection mode, the terminal equipment assumes that a control channel region corresponding to the downlink control channel comprises a resource unit corresponding to a DMRS (demodulation reference signal) for demodulating a physical downlink shared channel when detecting the downlink control channel;
    and if the high-level signaling indicates that the terminal equipment detects the downlink control channel according to a second detection mode, the terminal equipment assumes that a control channel region corresponding to the downlink control channel does not include a resource unit corresponding to a DMRS (demodulation reference signal) for demodulating a physical downlink shared channel when detecting the downlink control channel.
  6. The method of claim 1, wherein the detecting, by the terminal device, the downlink control channel demodulated based on a Cell Reference Signal (CRS) comprises:
    the terminal equipment receives second configuration information of a downlink control channel resource block set, the downlink control channel is borne on a time-frequency resource corresponding to the downlink control channel resource block set, and the second configuration information is used for indicating the terminal equipment to detect the downlink control channel according to a first detection mode or a second detection mode;
    the terminal equipment detects the downlink control channel according to the second configuration information;
    the detecting, by the terminal device, the downlink control channel according to the second configuration information includes:
    if the second configuration information indicates that the terminal equipment detects the downlink control channel according to a first detection mode, the terminal equipment assumes that time-frequency resources corresponding to the downlink control channel resource block set comprise resource units corresponding to a DMRS (demodulation reference signal) for demodulating a physical downlink shared channel when detecting the downlink control channel;
    if the second configuration information indicates that the terminal device detects the downlink control channel according to a second detection mode, the terminal device assumes that the time-frequency resource corresponding to the downlink control channel resource block set does not include a resource unit corresponding to a DMRS for demodulating a physical downlink shared channel when detecting the downlink control channel.
  7. The method of claim 6, wherein the terminal device detects a downlink control channel demodulated based on a Cell Reference Signal (CRS), further comprising:
    the terminal equipment receives first configuration information of a downlink control channel resource block set, wherein the first configuration information is used for indicating the number of time domain symbols corresponding to the downlink control channel resource block set;
    the terminal equipment determines the number of time domain symbols corresponding to the downlink control channel resource block set according to the first configuration information;
    the terminal equipment detects the downlink control channel according to the number of time domain symbols corresponding to the downlink control channel resource block set and the second configuration information;
    the detecting, by the terminal device, the downlink control channel according to the number of time domain symbols corresponding to the downlink control channel resource block set and the second configuration information includes:
    if the number of time domain symbols corresponding to the downlink control channel resource block set is smaller than the number of time domain symbols corresponding to the transmission time interval, the terminal device assumes that the time-frequency resources corresponding to the downlink control channel resource block set include resource units corresponding to a DMRS for demodulating a physical downlink shared channel when detecting the downlink control channel;
    and if the number of the time domain symbols corresponding to the downlink control channel resource block set is equal to the number of the time domain symbols corresponding to the transmission time interval, the terminal equipment detects the downlink control channel according to the second configuration information.
  8. The method of claim 1, wherein the detecting, by the terminal device, the downlink control channel demodulated based on a Cell Reference Signal (CRS) comprises:
    and when the terminal equipment detects the downlink control channel, the control channel region corresponding to the downlink control channel is assumed to comprise resource units corresponding to the DMRS for demodulating the physical downlink shared channel.
  9. The method according to any of claims 1-8, wherein the detecting, by the terminal device, the downlink control channel demodulated based on the Cell Reference Signal (CRS) comprises:
    the terminal equipment detects a downlink control channel demodulated based on CRS in a non-multicast/multicast single frequency network MBSFN subframe;
    and the terminal equipment detects the downlink control channel based on DMRS demodulation in the MBSFN subframe.
  10. A method for transmitting downlink control information is characterized by comprising the following steps:
    the network equipment sends downlink control information through a downlink control channel, and the downlink control channel is demodulated based on a cell reference signal CRS;
    the network equipment sends a physical downlink shared channel scheduled by the downlink control information, and the physical downlink shared channel is demodulated based on a demodulation reference signal (DMRS);
    and the transmission time interval for bearing the downlink control channel and the physical downlink shared channel is less than 1 millisecond.
  11. The method of claim 10, further comprising:
    the network equipment sends first configuration information of a downlink control channel resource block set, wherein the downlink control channel resource block set is used for bearing the downlink control channel, and the first configuration information is used for indicating the number of time domain symbols corresponding to the downlink control channel resource block set;
    and when the number of the time domain symbols corresponding to the downlink control channel resource block set is equal to the number of the time domain symbols corresponding to the transmission time interval, the network equipment performs mapping from the control channel unit corresponding to the downlink control channel to the resource unit group according to a time-first and frequency-second rule.
  12. The method of claim 10, further comprising:
    and the network equipment sends a high-level signaling, wherein the high-level signaling is used for indicating the terminal equipment to detect the downlink control channel according to a first detection mode or a second detection mode.
  13. The method of claim 10 or 11, further comprising:
    the network device sends second configuration information of a downlink control channel resource block set, the downlink control channel is borne on a time-frequency resource corresponding to the downlink control channel resource block set, and the second configuration is used for indicating the terminal device to detect the downlink control channel according to a first detection mode or a second detection mode.
  14. The method of claim 10, further comprising:
    the network equipment sends third configuration information of a downlink control channel resource block set, wherein the third configuration information is used for indicating configuration information of a first downlink control channel resource block set and configuration information of a second downlink control channel resource block set, the first downlink control channel resource block set is used for bearing a downlink control channel based on CRS demodulation, and the second downlink control channel resource block set is used for bearing a downlink control channel based on DMRS demodulation.
  15. The method of claim 14, wherein the network device sends downlink control information through a downlink control channel, comprising:
    the network equipment sends the downlink control information through the first downlink control channel resource block set in a non-MBSFN subframe;
    and the network equipment sends the downlink control information through the second downlink control channel resource set in the MBSFN subframe.
  16. A terminal device, comprising:
    a detection unit, configured to detect a downlink control channel demodulated based on a cell reference signal CRS;
    a processing unit, configured to decode a physical downlink shared channel demodulated based on a demodulation reference signal DMRS according to downlink control information carried on the downlink control channel;
    and the transmission time interval for bearing the downlink control channel and the physical downlink shared channel is less than 1 millisecond.
  17. The terminal device according to claim 16, wherein the detecting unit is configured to detect a downlink control channel demodulated based on a cell reference signal CRS, and specifically is configured to:
    the detecting unit is specifically configured to receive first configuration information of a downlink control channel resource block set, where the downlink control channel resource block set is used to carry the downlink control channel, and the first configuration information is used to indicate the number of time domain symbols corresponding to the downlink control channel resource block set, determine the number of time domain symbols corresponding to the downlink control channel resource block set according to the first configuration information, and detect the downlink control channel according to the number of time domain symbols corresponding to the downlink control channel resource block set.
  18. The terminal device of claim 17, wherein the detecting unit is configured to detect the downlink control channel according to the number of time domain symbols corresponding to the downlink control channel resource block set, and specifically:
    the detecting unit is specifically configured to assume that, when detecting the downlink control channel, the time-frequency resource corresponding to the downlink control channel resource block set includes a resource unit corresponding to a DMRS used for demodulating a physical downlink shared channel, when detecting the downlink control channel, the time-frequency resource corresponding to the downlink control channel resource block set is equal to the time-frequency symbol corresponding to the transmission time interval, and the control channel unit corresponding to the downlink control channel is mapped to the resource unit group according to a time-first and frequency-second rule, when detecting the downlink control channel, the time-frequency resource corresponding to the downlink control channel resource block set is assumed not to include a resource unit corresponding to a DMRS used for demodulating a physical downlink shared channel, and when detecting the time-frequency symbol corresponding to the downlink control channel resource block set is equal to the time-frequency symbol corresponding to the transmission time interval The number of the control channel units is greater than the number of the control channel units, and the control channel units corresponding to the downlink control channel are mapped to the resource unit group according to the rule of first frequency and then time, so that the time-frequency resources corresponding to the downlink control channel resource block set are assumed to comprise resource units corresponding to a DMRS (demodulation reference signal) for demodulating a physical downlink shared channel when the downlink control channel is detected.
  19. The terminal device according to claim 16, wherein the detecting unit is configured to detect a downlink control channel demodulated based on a cell reference signal CRS, and specifically is configured to:
    the detecting unit is specifically configured to determine the number of time domain symbols in a downlink control channel detection region corresponding to the downlink control channel, and detect the downlink control channel according to the number of time domain symbols in the downlink control channel detection region corresponding to the downlink control channel;
    the detecting unit is configured to detect the downlink control channel according to the number of time domain symbols in a downlink control channel detection region corresponding to the downlink control channel, and specifically includes:
    the detecting unit is specifically configured to assume that, when detecting the downlink control channel, the time-frequency resources corresponding to the downlink control channel resource block set include resource units corresponding to DMRS used for demodulating a physical downlink shared channel, if the number of time-domain symbols of a downlink control channel detection region corresponding to the downlink control channel is smaller than the number of time-domain symbols corresponding to the transmission time interval, and if the number of time-domain symbols of the downlink control channel detection region corresponding to the downlink control channel is equal to the number of time-domain symbols corresponding to the transmission time interval and the control channel units corresponding to the downlink control channel are mapped to the resource unit group according to a rule of first time and second frequency, when detecting the downlink control channel, the time-frequency resources corresponding to the downlink control channel resource block set are assumed not include resource units corresponding to DMRS used for demodulating the physical downlink shared channel, and if the number of time domain symbols of the downlink control channel detection region corresponding to the downlink control channel is equal to the number of time domain symbols corresponding to the transmission time interval, and the control channel unit corresponding to the downlink control channel is mapped to the resource unit group according to the rule of frequency first and time later, assuming that the time-frequency resource corresponding to the downlink control channel resource block set comprises the resource unit corresponding to the DMRS for demodulating the physical downlink shared channel when the downlink control channel is detected.
  20. The terminal device according to claim 16, wherein the detecting unit is configured to detect a downlink control channel demodulated based on a cell reference signal CRS, and specifically is configured to:
    the detecting unit is specifically configured to receive a high-level signaling, where the high-level signaling is used to instruct the terminal device to detect the downlink control channel according to a first detection method or a second detection method, and detect the downlink control channel according to the high-level signaling;
    the detecting unit is configured to detect the downlink control channel according to the high-level signaling, and specifically includes:
    the detecting unit is specifically configured to assume that a control channel region corresponding to the downlink control channel includes a resource unit corresponding to a DMRS used for demodulating a physical downlink shared channel when the downlink control channel is detected if the high-level signaling indicates that the terminal device detects the downlink control channel according to a first detection method, and assume that the control channel region corresponding to the downlink control channel does not include the resource unit corresponding to the DMRS used for demodulating the physical downlink shared channel when the downlink control channel is detected if the high-level signaling indicates that the terminal device detects the downlink control channel according to a second detection method.
  21. The terminal device according to claim 16, wherein the detecting unit is configured to detect a downlink control channel demodulated based on a cell reference signal CRS, and specifically is configured to:
    the detecting unit is specifically configured to receive second configuration information of a downlink control channel resource block set, where the downlink control channel is carried on a time-frequency resource corresponding to the downlink control channel resource block set, and the second configuration information is used to instruct the terminal device to detect the downlink control channel according to a first detection method or a second detection method, and detect the downlink control channel according to the second configuration information;
    the detecting unit is configured to detect the downlink control channel according to the second configuration information, and specifically includes:
    the detecting unit is specifically configured to assume that, when detecting the downlink control channel, the time-frequency resource corresponding to the downlink control channel resource block set includes a resource unit corresponding to a DMRS used for demodulating a physical downlink shared channel, if the second configuration information indicates that the terminal device detects the downlink control channel according to a first detection method, and assume that, when detecting the downlink control channel, the time-frequency resource corresponding to the downlink control channel resource block set does not include a resource unit corresponding to a DMRS used for demodulating a physical downlink shared channel, if the second configuration information indicates that the terminal device detects the downlink control channel according to a second detection method.
  22. The terminal device of claim 21,
    the detecting unit is specifically further configured to receive first configuration information of a downlink control channel resource block set, where the first configuration information is used to indicate a number of time domain symbols corresponding to the downlink control channel resource block set, determine the number of time domain symbols corresponding to the downlink control channel resource block set according to the first configuration information, and detect the downlink control channel according to the number of time domain symbols corresponding to the downlink control channel resource block set and the second configuration information;
    the detecting unit is configured to detect the downlink control channel according to the number of time domain symbols corresponding to the downlink control channel resource block set and the second configuration information, and specifically includes:
    the detecting unit is specifically configured to, if the number of time domain symbols corresponding to the downlink control channel resource block set is smaller than the number of time domain symbols corresponding to the transmission time interval, assume that the time-frequency resource corresponding to the downlink control channel resource block set includes a resource unit corresponding to a DMRS for demodulating a physical downlink shared channel when detecting the downlink control channel, and if the number of time domain symbols corresponding to the downlink control channel resource block set is equal to the number of time domain symbols corresponding to the transmission time interval, detect the downlink control channel according to the second configuration information.
  23. The terminal device according to claim 16, wherein the detecting unit is configured to detect a downlink control channel demodulated based on a cell reference signal CRS, and specifically is configured to:
    the detecting unit is specifically configured to assume that, when detecting the downlink control channel, a control channel region corresponding to the downlink control channel includes a resource unit corresponding to a DMRS for demodulating a physical downlink shared channel.
  24. The terminal device according to any one of claims 16 to 23, wherein the detecting unit is configured to detect a downlink control channel demodulated based on a cell reference signal CRS, and specifically is configured to:
    the detection unit is specifically configured to detect a downlink control channel demodulated based on a CRS in a non-multicast/multicast single frequency network MBSFN subframe, and detect a downlink control channel demodulated based on a DMRS in an MBSFN subframe.
  25. A network device, comprising:
    a sending unit, configured to send downlink control information through a downlink control channel, where the downlink control channel is demodulated based on a cell reference signal CRS, and sends a physical downlink shared channel scheduled by the downlink control information, and the physical downlink shared channel is demodulated based on a demodulation reference signal DMRS;
    and the transmission time interval for bearing the downlink control channel and the physical downlink shared channel is less than 1 millisecond.
  26. The network device of claim 25, wherein the sending unit is further configured to send first configuration information of a downlink control channel resource block set, where the downlink control channel resource block set is used to carry the downlink control channel, and the first configuration information is used to indicate the number of time domain symbols corresponding to the downlink control channel resource block set;
    the network device further includes: a processing unit;
    and the processing unit is configured to perform mapping from the control channel unit corresponding to the downlink control channel to the resource unit group according to a time-first and frequency-second rule when the number of time domain symbols corresponding to the downlink control channel resource block set is equal to the number of time domain symbols corresponding to the transmission time interval.
  27. The network device according to claim 25, wherein the sending unit is further configured to send a higher layer signaling, where the higher layer signaling is used to instruct a terminal device to detect the downlink control channel according to a first detection method or a second detection method.
  28. The network device according to claim 25 or 26, wherein the sending unit is further configured to send second configuration information of a downlink control channel resource block set, where the downlink control channel is carried on a time-frequency resource corresponding to the downlink control channel resource block set, and the second configuration information is used to instruct the terminal device to detect the downlink control channel according to a first detection manner or a second detection manner.
  29. The network device of claim 25, wherein the sending unit is further configured to send third configuration information of a set of downlink control channel resource blocks, and wherein the third configuration information indicates configuration information of a first set of downlink control channel resource blocks used for carrying CRS demodulation and configuration information of a second set of downlink control channel resource blocks used for carrying DMRS demodulation.
  30. The network device according to claim 29, wherein the sending unit is configured to send downlink control information through a downlink control channel, and specifically is configured to:
    the transmitting unit is specifically configured to transmit the downlink control information through the first downlink control channel resource block set in a non-MBSFN subframe, and transmit the downlink control information through the second downlink control channel resource set in an MBSFN subframe.
CN201780089841.6A 2017-05-03 2017-05-03 Downlink control information transmission method, terminal equipment and network equipment Pending CN110546907A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2017/082902 WO2018201345A1 (en) 2017-05-03 2017-05-03 Method for transmitting downlink control information, terminal device and network device

Publications (1)

Publication Number Publication Date
CN110546907A true CN110546907A (en) 2019-12-06

Family

ID=64015809

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201780089841.6A Pending CN110546907A (en) 2017-05-03 2017-05-03 Downlink control information transmission method, terminal equipment and network equipment

Country Status (2)

Country Link
CN (1) CN110546907A (en)
WO (1) WO2018201345A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102883368A (en) * 2011-07-13 2013-01-16 夏普株式会社 Distribution method and equipment of physical downlink control channel
WO2016148789A1 (en) * 2015-03-13 2016-09-22 Qualcomm Incorporated Dmrs based dl for low latency
US20160338046A1 (en) * 2015-05-12 2016-11-17 Qualcomm Incorporated Transmission time interval operation for low latency

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102883368A (en) * 2011-07-13 2013-01-16 夏普株式会社 Distribution method and equipment of physical downlink control channel
WO2016148789A1 (en) * 2015-03-13 2016-09-22 Qualcomm Incorporated Dmrs based dl for low latency
US20160338046A1 (en) * 2015-05-12 2016-11-17 Qualcomm Incorporated Transmission time interval operation for low latency

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
HUAWEI等: "Discussion on DL RS for short TTI", 《3GPP TSG RAN WG1 MEETING #84》 *

Also Published As

Publication number Publication date
WO2018201345A1 (en) 2018-11-08

Similar Documents

Publication Publication Date Title
CN107078884B (en) Method, apparatus, and computer readable medium for narrowband control channel decoding
CN110521163B (en) Physical downlink control channel structure in low latency systems
CN104604314A (en) Systems and methods for semi-persistent scheduling of wireless communications
CN109150463B (en) Information sending and receiving method and device
US20220190954A1 (en) Control Channel Design for Category-A Devices
CN108347324B (en) Communication method and network device
US11088804B2 (en) Reference signal transmission method, apparatus, and system
WO2013134891A1 (en) Methods and devices of interference channel measurement in radio network
CN108604950B (en) Data transmission method and device
CN113872905B (en) Resource allocation method, device and system
CN111867038A (en) Communication method and device
CN113286367B (en) Information receiving method, information sending method and equipment
CN110547007A (en) Wireless communication method, terminal equipment and transmitting and receiving node
US9480059B2 (en) Method of indicating downlink control channel and related communication device
WO2013138989A1 (en) Method and apparatus for determining the physical downlink shared channel fallback mode
US20230328705A1 (en) Demodulation Reference Signal Allocation for Uplink Shared Channel for Wireless Communication
WO2018082500A1 (en) Pilot mapping method and device
US20220303081A1 (en) Handling Multi-TRP Transmissions
CN110546907A (en) Downlink control information transmission method, terminal equipment and network equipment
WO2020194264A1 (en) Methods and nodes for downlink intra-ue pre-emption
CN116615941A (en) Dedicated resource configuration for transmission of demodulation reference signals
US20140204921A1 (en) Wireless communication system, base station, and mobile station
WO2023226046A1 (en) Method and apparatus for indicating tci state, and device and medium
US20240015740A1 (en) Method and apparatus for downlink transmission in physical downlink control channel
WO2023193233A1 (en) Method and apparatus for subband utilization in full duplex system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20191206

WD01 Invention patent application deemed withdrawn after publication