WO2020020006A1 - 下行检测、发送方法、装置及通信系统、终端、基站 - Google Patents
下行检测、发送方法、装置及通信系统、终端、基站 Download PDFInfo
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- WO2020020006A1 WO2020020006A1 PCT/CN2019/096022 CN2019096022W WO2020020006A1 WO 2020020006 A1 WO2020020006 A1 WO 2020020006A1 CN 2019096022 W CN2019096022 W CN 2019096022W WO 2020020006 A1 WO2020020006 A1 WO 2020020006A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present disclosure relates to the field of communications, and in particular, to a method and device for downlink detection and transmission, a communication system, a terminal, and a base station.
- the base station needs to perform the PDCCH (Physical Downlink Control Channel) detection of the terminal in semi-static configuration through high-level signaling.
- PDCCH Physical Downlink Control Channel
- the terminal needs to perform PDCCH detection at the specified time domain position and frequency domain position according to the configuration. For example, the base station instructs the terminal to use m timeslots as the detection period to perform PDCCH detection on the symbols whose serial number is a multiple of 3 in the detection period, and the terminal will only perform PDCCH detection in a specified manner in the subsequent process.
- the detection granularity of the configured PDCCH detection opportunity strategy is too small, the frequency of terminal detection will be relatively high, which will increase the complexity and power consumption of the PDCCH detection by the terminal; if the detection granularity of the configured PDCCH detection opportunity strategy is too large, It will reduce the opportunity for the base station to perform downlink transmission, and will cause the base station to wait for a long time to obtain a transmission opportunity when there is downlink information to be transmitted.
- the downlink detection and transmission method, device, communication system, terminal, and base station provided by the embodiments of the present disclosure mainly solve the technical problem: since the terminal can only perform blind PDCCH detection according to the unified detection opportunity policy configured by the base station, it is easy to configure the The detection granularity is too large, resulting in a large delay in the downlink transmission of the base station, or the configured detection granularity is too small, resulting in a large detection workload and high power consumption of the terminal.
- an embodiment of the present disclosure provides a downlink detection method, including:
- the downlink detection is performed according to the target detection opportunity strategy corresponding to the target time slot.
- the detection granularity of the target detection opportunity strategy is smaller than that of the ordinary detection opportunity strategy.
- the common detection opportunity strategy is the detection opportunity strategy of other time slots in the COT except the target time slot.
- An embodiment of the present disclosure further provides a downlink sending method, including:
- the starting time-frequency position of the downlink information is determined based on the target detection opportunity strategy corresponding to the target time slot.
- the target detection opportunity strategy is used to indicate the downlink detection of the terminal. Detection granularity of detection opportunity strategy;
- An embodiment of the present disclosure further provides a downlink detection device, including:
- a timeslot determining module configured to determine a current timeslot as a target timeslot in a channel occupation period COT;
- the information detection module is configured to perform downlink detection according to the target detection opportunity policy corresponding to the target time slot.
- the detection granularity of the target detection opportunity policy is smaller than that of the ordinary detection opportunity policy.
- the common detection opportunity policy is when the COT except the target time slot Gap detection opportunity strategy.
- An embodiment of the present disclosure further provides a downlink detection device, including:
- a sending determination module configured to determine that there is a need to send downlink information to the terminal in a target time slot of the COT;
- a position determination module is configured to determine a start time-frequency position of sending downlink information based on a target detection opportunity strategy corresponding to a target time slot.
- the target detection opportunity strategy is used to indicate a downlink detection of a terminal.
- the detection granularity of the target detection opportunity strategy is smaller than that of the COT. Detection granularity of common detection opportunity policies outside the target time slot;
- An information sending module is configured to send downlink information to a terminal at a transmission start time-frequency position.
- An embodiment of the present disclosure further provides a terminal including a first processor, a first memory, and a first communication bus; the first communication bus is used to implement connection and communication between the first processor and the first memory;
- the first processor is configured to execute one or more programs stored in the first memory to implement the steps of the downlink detection method as above.
- An embodiment of the present disclosure further provides a base station including a second processor, a second memory, and a second communication bus; the second communication bus is used to implement connection and communication between the second processor and the second memory;
- the second processor is configured to execute one or more programs stored in the second memory, so as to implement the steps of the downlink sending method above.
- An embodiment of the present disclosure further provides a communication system including the above-mentioned terminal and the above-mentioned base station.
- An embodiment of the present disclosure further provides a storage medium. At least one of a downlink detection program and a downlink transmission program is stored in the storage medium.
- the downlink detection program may be executed by one or more processors to implement the above-mentioned downlink detection method. Steps:
- the downlink sending program may be executed by one or more processors to implement the steps of the downlink sending method as above.
- the target detection corresponding to the target time slot can be performed.
- Opportunity strategy to determine the starting time-frequency position of sending downlink information, and then send the downlink information to the terminal at the determined time-frequency position.
- the terminal it performs downlink detection in the target time slot according to the target detection opportunity policy, so the downlink information sent by the base station can be detected by the terminal.
- the terminal since the terminal has two different detection opportunity strategies for time slots in the COT, for ordinary time slots in the COT, the terminal can use the ordinary detection opportunity strategy to detect, and target terminals in the COT. , The terminal can use the target detection opportunity strategy for detection.
- the detection granularity of the target detection opportunity strategy is smaller than the detection granularity of the ordinary detection opportunity strategy, that is, the detection density is greater, so the base station has a denser transmission opportunity in the target time slot.
- the downlink information transmission can be completed at the corresponding time-frequency position.
- the detection granularity of the terminal is large and the detection density is small. Therefore, the detection workload of the terminal is relatively small, which is conducive to reducing the power consumption caused by the downlink detection to the terminal.
- FIG. 1 is a schematic diagram of the total number of symbols and the actual number of detected symbols in a detection period shown in Embodiment 1 of the present disclosure
- FIG. 2 is a flowchart of a downlink detection method provided in Embodiment 1 of the present disclosure
- FIG. 3 is a flowchart of a downlink sending method provided in Embodiment 2 of the present disclosure.
- FIG. 4 is a schematic structural diagram of a downlink detection device provided in Embodiment 4 of the present disclosure.
- FIG. 5 is a schematic structural diagram of a downlink sending apparatus provided in Embodiment 5 of the present disclosure.
- FIG. 6 is a schematic structural diagram of a downlink detection device provided in Embodiment 6 of the present disclosure.
- FIG. 7 is a schematic structural diagram of a downlink sending apparatus provided in Embodiment 6 of the present disclosure.
- Embodiment 8 is a schematic diagram of a communication system provided in Embodiment 7 of the present disclosure.
- FIG. 9 is a schematic diagram of a hardware structure of a terminal provided in Embodiment 7 of the present disclosure.
- FIG. 10 is a schematic diagram of a hardware structure of a base station provided in Embodiment 7 of the present disclosure.
- Example 11 is a schematic diagram of a time-domain detection pattern provided in Example 2 of Embodiment 8 of the present disclosure.
- FIG. 12 is a schematic diagram of a frequency domain detection pattern provided in Example 3 of Embodiment 8 of the present disclosure.
- unlicensed spectrum resources With the explosive growth of communication demand, spectrum resources are becoming increasingly tight. In order to meet the exponentially increasing demand, additional spectrum resources need to be added. Because licensed spectrum resources are limited, communication providers need to seek out unlicensed spectrum resources, that is, unlicensed spectrum resources, to solve the problem. Compared with licensed carriers, unlicensed carriers have the advantages of free / low cost, low access requirements, shareable resources, multiple wireless access technologies, and multiple sites. At present, 3GPP (3rd Generation Partnership Project, 3rd Generation Partnership Project) The technology has conducted research on the transmission operation of unlicensed carriers.
- LBT Listen Before Talk
- CCA Clear Channel Assessment
- the base station For downlink transmission, the base station sends downlink information after LBT is successful. For the terminal, it cannot accurately determine when and on what frequency band the base station performs downlink information transmission. It can only perform detection according to the detection opportunity policy configured by the base station through high-level signaling in advance. For the base station, since the time-frequency position at which the terminal starts downlink detection, that is, the detection start position is determined, the time-frequency position at which the base station starts downlink information transmission, that is, the transmission start time-frequency position is also determined.
- the base station uses the CORESET (control resource set) parameters and the search space (search space) parameters. Entity) indicates to the terminal a detection opportunity policy.
- the search space parameter can indicate the time domain location to be detected.
- the search space parameter includes monitoring, Period, and Offset parameters, and monitoring Symbols Within slots. Parameter. Through these two parameters, the base station can indicate to the terminal how many time slots are used as the detection period, and which symbols of which time slot need to be detected in the detection period.
- the CORESET parameter can indicate the frequency domain position to be detected and the length of the downlink control information.
- the detection granularity of this detection opportunity strategy is fixed, and the transmission opportunity granularity of the corresponding base station side for downlink transmission is also fixed.
- the base station and the terminal can only perform downlink transmission and downlink detection according to the fixed granularity, respectively.
- the detection granularity of the detection opportunity policy configured by the base station in the related technology has nothing to do with whether the base station turns on a COT, and has nothing to do with each time slot in the COT.
- the base station may Sending downlink information, but for the terminal, the detection complexity, detection workload will be large, and the power consumption is also high.
- the detection granularity configured by the base station is too large, for example, the terminal is instructed to use two time slots as a cycle, and only the last symbol in the latter time slot is detected in this detection cycle. In this way, the burden of the terminal's downlink detection is really small.
- this embodiment provides a downlink detection method, which is applied to a terminal side and executed by the terminal:
- the terminal no longer performs downlink detection based on the semi-statically configured detection opportunity policy of the base station that is independent of each time slot in the COT.
- the granularity of the terminal's downlink detection is related to the time slot in the COT: Time slots can be divided into target time slots and ordinary time slots. For target time slots, the terminal can perform downlink detection according to the target detection opportunity strategy. For other time slots in the COT except the target time slot, the terminal can use ordinary detection opportunities. Strategy for downlink detection. The detection granularity in the target detection opportunity strategy is smaller than the detection granularity in the ordinary detection opportunity strategy. Therefore, when the terminal performs downlink detection according to the target detection opportunity strategy, the detection density is greater.
- the detection density is relatively high. small. It can be understood that the smaller the detection granularity, the greater the corresponding detection density, the greater the detection intensity, and the more detailed the downstream detection; otherwise, the larger the detection granularity, the smaller the corresponding detection density and the smaller the detection intensity. The rougher the downstream detection. Therefore, in this embodiment, the terminal performs more vigorous and detailed detection for the target time slot in the COT, while for the ordinary time slot, the terminal performs only a lesser detection.
- the base station side has a relatively dense downlink transmission opportunity in the target time slot of the COT, and in the ordinary time slot, the downlink transmission opportunity is relatively sparse.
- the above-mentioned target slot detection opportunity strategy includes, but is not limited to, detecting even-numbered symbols in the target slot, or detecting odd-numbered symbols in the target slot, or 0 in the target slot. , 2, 4, 7 symbols are detected.
- the above common time slot detection opportunity strategy includes, but is not limited to, detecting the first symbol of each common time slot, or detecting the number of 0 symbols and the number of 7 symbols in each common time slot, or Detection is performed every two ordinary time slots.
- the detection granularity may include time-domain detection granularity and frequency-domain detection granularity.
- the detection granularity of the target detection opportunity strategy is smaller than that of the ordinary detection opportunity strategy. This may be because the time-domain detection granularity of the target detection opportunity strategy is less than
- the time-domain detection granularity of the common detection opportunity strategy may also be because the frequency-domain detection granularity of the target detection opportunity strategy is smaller than the frequency-domain detection granularity of the ordinary detection opportunity strategy, or it may be because of the time-domain detection granularity and frequency domain of the target detection opportunity strategy.
- the detection granularity is smaller than the granularity corresponding to the common detection opportunity strategy.
- the time-domain detection granularity refers to the ratio of the total number of symbols to the actual number of detected symbols, where the total number of symbols refers to the number of all symbols remaining in the detection period when PDCCH detection is started in one detection period.
- the detection period includes a total of 28 symbols, and the symbols to be detected include the serial number in the first time slot slot1 (assuming In this embodiment, all the symbols in the timeslot start from 0) are all odd symbols and the symbols in the second timeslot slot2 are 2, 4, 6, and 8 respectively. Therefore, there are actually 18 symbols that the terminal will perform downlink detection, and the detection granularity is 28/18, that is, 14/9.
- the time slots included in the detection period are not necessarily all complete time slots.
- the terminal determines to enter the target time slot half of the target time slot has passed. In this case, the total number of symbols in the detection period is seven.
- the frequency domain detection granularity is the ratio of the total frequency band value to the actual detected frequency band value.
- the total frequency band is the sum of the frequency bands of the candidate frequency bands used for downlink transmission.
- the downlink information is sent, so the total frequency band sum is the sum of the three BWP frequency bands, and it is assumed here that the total frequency band sum is 80 MHz. It can be understood that the terminal does not necessarily perform downlink detection on all frequency positions in the three BWPs. Assuming that the terminal performs downlink detection only on 20MHz in BWP1 and 20MHz in BWP2 during the detection period, the actual frequency band detected The value is 40MHz, so the frequency domain detection granularity is 80/40, which is 2.
- S202 The terminal determines that the current time slot is a target time slot in the COT.
- the target time slot refers to a time slot in which the base station in the COT has a high demand for downlink transmission.
- These time slots may be designated by the management in the COT according to experience, for example, the first time slot after the COT is turned on.
- One time slot for example, the last time slot before the end of the COT. Therefore, in an example of this embodiment, the target time slot may include the first time slot and / or the last time slot in the COT. In this case, the position of the target slot in the COT is fixed.
- the base station may notify the terminal whether the subsequent time slot is the target time slot according to the requirements of its own downlink transmission. In this case, the relative position of the target slot in the COT is not fixed.
- the base station and the terminal predetermined the relative position of the target time slot in the COT, and then the base station sends the COT start instruction information to the terminal after the successful execution of the LBT to notify the terminal that the COT has been turned on.
- the terminal can determine whether the current time is the target time slot. For example, the base station and the terminal determine in advance that the first time slot in the COT is a target time slot for detailed detection. After the terminal receives the COT start instruction information sent by the base station, as long as the current time is away from receiving the start of the COT The time of the indication information is less than one time slot, then the terminal may determine that it is currently in the target time slot.
- the COT start indication information mentioned herein may include one or a combination of a preamble signal, a demodulation reference signal, a measurement reference signal, a synchronization signal, and a predefined sequence signal.
- the preamble signal, the demodulation reference signal, and the synchronization signal are all relatively common signals at present, and the predefined sequence signal is information pre-agreed by the base station and the terminal and used to notify the COT to be turned on.
- the terminal determines that the resource mapping type corresponding to the PDSCH (Physical Downlink Shared Channel) in the downlink control information DCI recently detected is the second mapping type (mapping type B) .
- the time domain resource allocation indication in the DCI information sent by the base station to the terminal indicates that the resource mapping type corresponding to the PDSCH is the first mapping type (mapping type A)
- the base station may only The first three symbols of the slot send downlink information to the terminal.
- the terminal only needs to perform downlink detection for the first three symbols of each slot.
- the base station may send downlink information to the terminal at any symbol position in a time slot in the subsequent process, and the terminal needs to perform downlink detection is not limited to the first three of each time slot Symbol, so the terminal's downlink detection detection granularity is usually smaller than the detection granularity corresponding to the first mapping type. Therefore, when the terminal receives DCI information indicating that the resource mapping type is the second mapping type, the terminal can determine that the target slot is currently entered Until the terminal receives the time domain resource allocation indication that the resource mapping type corresponding to the PDSCH is the first mapping type DCI date information.
- the terminal receives a handover instruction when performing downlink detection using a common detection opportunity strategy.
- the handover instruction is used to instruct the terminal to switch the detection opportunity policy based on the downlink detection to another detection opportunity policy. For example, if the currently used detection opportunity policy is a target detection opportunity policy, the terminal needs to switch to the normal detection opportunity policy. Downlink detection is performed. On the contrary, if the terminal currently uses a common detection opportunity policy, the terminal needs to switch to the target detection opportunity policy for downlink detection according to the handover instruction. Therefore, in this embodiment, if the terminal receives a handover instruction when performing downlink detection using a common detection opportunity strategy, the terminal may determine that the target time slot of the COT is currently entered. The target time slot will be consistent until the terminal receives the handover instruction again.
- a specific RNTI Radio Network Temporary Identifier
- a 1 bit can be set in the DCI signaling to indicate whether the detection opportunity currently used is required.
- the policy switches to another detection opportunity policy for detection. For example, take “0" as the handover identifier. If the DCI signaling carries the handover identifier "0", it means that the detection opportunity strategy used for downlink detection needs to be switched: If the current detection opportunity strategy is used, the terminal needs Use the target detection opportunity strategy for downstream detection at subsequent times. If the terminal currently uses the target detection opportunity strategy, the terminal needs to use the ordinary detection opportunity strategy for downstream detection at subsequent times.
- S204 The terminal performs downlink detection according to the target detection opportunity policy corresponding to the target time slot.
- the terminal After the terminal determines that the current time slot is the target time slot in the COT, it performs downlink detection at the corresponding detection start time-frequency position according to the target detection opportunity strategy corresponding to the target time slot. Of course, if the terminal determines that the current time slot is not the target time slot, the terminal may directly perform downlink detection at the corresponding detection start time-frequency position according to a common detection opportunity strategy.
- the base station After the base station successfully executes LBT and starts a COT, it will first send DCI (Downlink Control Information) to the terminal. Therefore, the downlink detection of the terminal can be performed by PDCCH detection to detect the downlink sent by the base station. Control information.
- the base station may also send data to the terminal directly after COT is turned on, that is, the data is sent first without sending downlink control information. In this case, the downlink detection of the terminal is aimed at Blind detection of downlink data.
- the terminal performs downlink detection by determining that the current time slot is a target time slot in the COT, and then performing a target detection opportunity strategy corresponding to the target time slot.
- the base station needs more downlink transmission in some timeslots of the COT, while in other timeslots, there is less need for downlink transmissions, so the terminal and the base station can transfer the
- the base station performs timeslots with a high probability of downlink transmission (for example, the first and / or last timeslots in the COT) as the target timeslots.
- the detection granularity of the target detection opportunity strategy is smaller than that of the ordinary detection opportunity strategy.
- the feature allows the terminal to perform relatively detailed detection on these target time slots when performing downlink detection, thereby providing the base station side with more downlink transmission opportunities; for other time slots in the COT except the target time slot, the terminal can Detection is performed according to a common detection opportunity strategy, thereby reducing the burden of downlink detection on the terminal side and reducing terminal power consumption.
- This embodiment provides a downlink transmission method corresponding to the downlink detection method in Embodiment 1.
- the downlink transmission method is applied to a base station side and may be executed by the base station. Because the downlink detection of the terminal is blind detection, when the base station sends the downlink information, it cannot determine the time-frequency position of the downlink transmission at will. It needs to ensure that the time-frequency position of the downlink information transmission is the time when the terminal performs the downlink detection. Frequency position. Therefore, when the base station determines the time-frequency position of the start of sending the downlink information, it will perform it according to the detection opportunity strategy of the terminal side for downlink detection. The following describes the downlink sending method with reference to the flowchart shown in FIG. 3:
- the base station determines that there is a need to send downlink information to the terminal in a target time slot of the COT.
- each time slot in the COT is divided into a target time slot and an ordinary time slot.
- the base station determines that it currently needs to send downlink information to the terminal, the base station can determine that the current transmission requirement for sending downlink information is It belongs to the downlink transmission demand of the target time slot or the downlink transmission demand of the ordinary time slot. Therefore, when the base station determines whether there is a need to send downlink information to the terminal in the target time slot of the COT, it first needs to determine which time slot or slots are the target time slots.
- Target time slots refer to the time slots in the COT where the base station's downlink transmission requirements are more intensive. These time slots can be designated by the management personnel in the COT based on experience, such as the first time slot after the COT is turned on. For example, The last time slot before the end of the COT, so in some examples, the target time slot may include the first time slot and / or the last time slot in the COT. In this case, the position of the target slot in the COT is fixed. However, in some other examples of this embodiment, the base station may notify the terminal whether the subsequent time slot is the target time slot according to its downlink transmission requirements. Since the downlink transmission requirements of the base station are not fixed, in this case, the target time The relative position of the gap in the COT is not fixed.
- the base station can notify the terminal of the relative position of the target time slot in the COT through high-level signaling in advance, or the management personnel can configure the base station and the terminal respectively in advance, so that The base station and the terminal determine the relative position of the target time slot within the COT.
- the base station and the terminal determine in advance that the target time slot is the first time slot in the COT.
- the base station can determine whether it is currently in the target time slot according to the time of the current time and the start time of the COT.
- the base station After the base station successfully executes LBT and turns on the COT, it can send COT start instruction information to the terminal so that the terminal can also know the start time of the COT. Therefore, the position of the target time slot is determined by combining the start time of the COT and the predetermined relative position of the target time slot in the COT.
- the COT start indication information mentioned herein may include one or a combination of a preamble signal, a demodulation reference signal, a measurement reference signal, a synchronization signal, and a predefined sequence signal.
- the preamble signal, the demodulation reference signal, and the synchronization signal are all relatively common signals at present, and the predefined sequence signal is information pre-agreed by the base station and the terminal and used to notify the COT to be turned on.
- the base station can determine whether it is the current target time slot according to whether its current transmission demand is dense. For example, at a certain time, the base station judges that the time slot from the current time is a period of time. If it needs to send downlink information to the terminal more frequently, the base station can determine that the time slots in this period belong to the target time slot. In this case, the base station needs to instruct the terminal before the terminal can determine that the current time slot belongs to the target time slot:
- the base station and the terminal agree in advance that the terminal receives DCI information whose resource mapping type corresponding to the PDSCH is the second mapping type at time t1 and receives the time at time t2.
- the time domain resource allocation indicates that the resource mapping type corresponding to the PDSCH is DCI information of the first mapping type, and then all time slots between t1 and t2 belong to the target time slot. Therefore, in this case, when the base station determines that the target slot is currently entered, it may send to the terminal a DCI indicating that the resource mapping type corresponding to the PDSCH is the second mapping type.
- the base station and the terminal have agreed in advance that if the terminal originally used a common detection opportunity strategy for downlink detection and received a handover instruction sent by the terminal at a certain time, the terminal may determine from the current At this moment, it enters the target time slot until it receives the handover instruction from the base station again.
- the base station can scramble the DCI signaling through a specific RNTI as a handover instruction, and 1 bit can be set in the DCI signaling to indicate whether it is necessary to switch from the currently used detection opportunity strategy to another detection opportunity strategy for detection. . For example, take "0" as the handover identifier.
- the DCI signaling carries the handover identifier "0"
- the detection opportunity strategy used for downlink detection needs to be switched: If the current detection opportunity strategy is used, the terminal needs Use the target detection opportunity strategy for downstream detection at subsequent times. If the terminal currently uses the target detection opportunity strategy, the terminal needs to use the ordinary detection opportunity strategy for downstream detection at subsequent times.
- "1" may also be set as the switching identifier.
- the base station determines a start time and frequency position of sending downlink information based on a target detection opportunity policy corresponding to a target time slot.
- the base station can determine the starting time-frequency position of the downlink information according to the target detection opportunity strategy. Obviously, the starting time-frequency position of the transmission includes information transmission. Time domain location and frequency domain location of the message. If the base station determines that it needs to send downlink information to the terminal in the ordinary time slot, it can determine the start time and frequency position of the downlink information according to the ordinary detection opportunity policy corresponding to the ordinary time slot.
- the base station determines the starting time-frequency position of sending downlink information according to the target detection opportunity strategy or determines the sending position of downlink information according to the common detecting opportunity strategy, the starting time-frequency position determined by the base station must be the target detection.
- Opportunity strategy / general detection opportunity strategy indicates the starting time-frequency position to be detected.
- the detection granularity in the target detection opportunity strategy is smaller than the detection granularity in the ordinary detection opportunity strategy. Therefore, when the terminal performs downlink detection according to the target detection opportunity strategy, the detection density is greater. When the terminal performs detection according to the ordinary detection opportunity strategy, the detection density is relatively high. small. It can be understood that the smaller the detection granularity of the terminal, the greater the corresponding detection density, and the more opportunities for the base station to send downlink information; conversely, the larger the detection granularity of the terminal, the smaller the corresponding detection density. The sparser the opportunities available for the base station to send downlink information.
- the above detection granularity may include time-domain detection granularity and frequency-domain detection granularity.
- the detection granularity of the target detection opportunity strategy is smaller than that of the ordinary detection opportunity strategy. This may be because the time-domain detection granularity of the target detection opportunity strategy is smaller than that of the ordinary detection opportunity strategy.
- the time-domain detection granularity may also be because the frequency-domain detection granularity of the target detection opportunity strategy is smaller than the frequency-domain detection granularity of the ordinary detection opportunity strategy, or it may be because the time-domain detection granularity and frequency-domain detection granularity of the target detection opportunity strategy are smaller than ordinary The granularity corresponding to the detection opportunity strategy.
- the time-domain detection granularity refers to the ratio of the total number of symbols to the actual number of detected symbols, where the total number of symbols refers to the number of all symbols remaining in the detection period when PDCCH detection is started in one detection period. If there are two time slots in a detection period, there is no doubt that the detection period includes a total of 28 symbols, and the symbols to be detected include all symbols with odd sequence numbers in the first time slot and the second time slot.
- the internal serial numbers are symbols of 1, 3, 5, 9 respectively. Therefore, there are actually 18 symbols that the terminal will perform downlink detection, and the detection granularity is 28/18, that is, 14/9.
- the time slots included in the detection period are not necessarily all complete time slots. For example, in an example of this embodiment, when the terminal determines to enter the target time slot, half of the target time slot has passed. In this case, the total number of symbols in the detection period is seven.
- the frequency domain detection granularity is the ratio of the total frequency band value to the actual detected frequency band value.
- the total frequency band is the sum of the frequency bands of the candidate frequency bands for downlink transmission.
- the base station Take the base station as the terminal to configure three BWPs as an example. Since the base station may use at least one of BWP1, BWP2, and BWP3 to send downlink information to the terminal, the total frequency band The sum is the sum of the three BWP frequency bands, and it is assumed here that the total frequency band sum is 80 MHz. It can be understood that the terminal does not necessarily perform downlink detection on all frequency positions in the three BWPs. Assuming that the terminal performs downlink detection only on 20MHz in BWP1 and 20MHz in BWP2 during the detection period, the actual frequency band detected The value is 40MHz, so the frequency domain detection granularity is 80/40, which is 2.
- the base station sends downlink information to the terminal at the transmission start time-frequency position.
- the base station After the base station determines the transmission start time-frequency position according to the target detection opportunity strategy, it can send downlink information to the terminal at the transmission start time-frequency position. Generally, after the base station successfully executes LBT and starts a COT, it first sends DCI information to the terminal. Therefore, the downlink information sent by the base station to the terminal at the determined transmission start time-frequency position may be DCI information. Of course, in some special cases, the base station may also send data directly to the terminal after COT is turned on, that is, the data is sent first without sending downlink control information. In this case, the base station starts the corresponding transmission. The downlink information sent to the terminal at the starting time-frequency position is the downlink data.
- the base station determines the starting time-frequency position of sending the downlink information based on the target detection opportunity policy corresponding to the target time slot, and then Send downlink information to the terminal at the determined transmission start time-frequency position.
- the base station and the terminal can respectively perform downlink information transmission and downlink detection according to two detection opportunity policies with different detection granularities, so that the base station can obtain more timely and frequent timeslots for downlink transmission in a timely manner.
- the downlink sending method provided in this embodiment considers both the downlink transmission efficiency of the base station and the power consumption on the terminal side. Compared with the methods in related technologies, it can effectively improve the user experience on the terminal side.
- the terminal detects the target time slot in the COT according to the target detection opportunity policy, and In the COT, downlink detection is performed on other common time slots except the target time slot.
- the base station needs to send downlink information in the target time slot, the base station needs to determine the time and frequency position of the downlink information transmission based on the target detection opportunity policy. If the base station needs to send downlink information to the terminal in other common time slots except the target time slot in the COT, the base station needs to determine the transmission start time-frequency position of the downlink transmission based on the common detection opportunity strategy.
- the terminal needs to determine the target detection opportunity strategy.
- the terminal Before the terminal adopts the common detection opportunity strategy for downlink detection, the terminal needs to determine the common detection opportunity strategy; correspondingly, the base station based on the target Before the detection opportunity strategy performs downlink transmission, the base station needs to determine the target detection opportunity strategy. Before the base station performs downlink transmission based on the ordinary detection opportunity strategy, the base station needs to determine the ordinary detection opportunity strategy.
- the target detection opportunity strategy Before the base station performs downlink transmission based on the ordinary detection opportunity strategy, the base station needs to determine the ordinary detection opportunity strategy.
- the base station may configure the target detection opportunity strategy to the terminal in a semi-static form through high-level signaling: the base station first determines the first semi-static configuration information, which may indicate the target detection opportunity strategy. After determining the first semi-static configuration information, the base station may send the first semi-static configuration information to the terminal, and then both the base station and the terminal may determine the target detection opportunity policy according to the first semi-static configuration information. In some examples of this embodiment, the base station may send the first semi-static configuration information to the terminal at the first symbol in the first time slot in the COT.
- the first semi-static configuration information may include a symbol indication and / or a frequency band indication, where the symbol indication is used to indicate whether each symbol in the target time slot needs to be detected in the downlink, and the frequency band indication is used It is used to indicate whether candidate frequency bands are needed for downlink detection in the target time slot.
- the symbol indication may be a symbol bitmap bitmap corresponding to each symbol in the target slot. For example, if n symbols are included in the target slot, the symbol bitmap will also include n bits, each bit uniquely corresponds to a symbol .
- the frequency band indication may also be a frequency band bitmap. Each candidate frequency band corresponds to a bit in the frequency band bitmap, and is used to indicate whether downlink detection is required for the candidate frequency band in the target time slot.
- the first semi-static configuration information may include a CORESET parameter and a search space parameter.
- the meaning of the search space parameter and the base station in the related technology are sent to the base station through high-level signaling.
- the meaning of the terminal search space parameter is somewhat different: in this example, the slot offset indicated by the search space parameter is the slot offset relative to the start time of the COT.
- this embodiment also provides a solution that allows the terminal and the base station to determine the target detection opportunity policy.
- the terminal and the base station determine the target detection opportunity strategy in a predefined manner.
- the base station may receive the first and defined configuration parameters, and then determine the target detection opportunity strategy according to the first predefined configuration parameter.
- the first predefined configuration parameter may be input to the base station by a base station manager.
- the terminal can also determine the target detection opportunity strategy by acquiring the first predefined configuration parameter.
- the terminal receives and stores the first predefined configuration parameter input by the programmer during the design and production phases; of course, the terminal can also be used by the user during the use phase.
- the programmer sends the first predefined configuration parameter to the terminal in the form of a network, for example, when the system is upgraded, the first predefined configuration parameter is carried in the upgrade file and sent to the terminal.
- the two methods of determining the target detection opportunity strategy by the base station and the terminal have been introduced before.
- the base station and terminal Similar to the target detection opportunity strategy, the base station and terminal also have the following two methods when determining the common detection opportunity strategy:
- Method 1 The base station determines the second semi-static configuration information, then determines a common detection opportunity policy according to the second semi-static configuration information, and sends the second semi-static configuration information to the terminal. After receiving the second predefined configuration parameter, the terminal may determine a common detection opportunity strategy for detecting ordinary time slots in the OT according to the second semi-static configuration information.
- Manner 2 The base station and the terminal respectively receive a second predefined configuration parameter, and then determine a common detection opportunity policy according to the second predefined configuration parameter.
- the second semi-static configuration information may also include a symbol indication and a frequency band indication.
- the second semi-static configuration information includes a symbol bitmap corresponding to a symbol in a common time slot, and / or the second semi-static configuration information also includes a frequency band bitmap corresponding to the same candidate frequency band.
- the second semi-static configuration information may also indicate the time-frequency position to be detected in an ordinary time slot by using the CORESET parameter and the search space parameter.
- the second semi-static configuration information The time slot offset indicated by the search space parameter is the time slot offset relative to the start time of the COT.
- Case 1 The two use the first semi-static configuration information and the second semi-static configuration information to determine the target detection opportunity policy and the common detection opportunity policy; in this case, the first semi-static configuration information and the second semi-static configuration Information can be sent from the base station to the terminal at the same time.
- the target time slot is the first time slot in the COT
- the ordinary time slot is a time slot other than the first time slot in the COT.
- the base station can configure two detection opportunity policies to the terminal through high-level signaling.
- the detection granularity belongs to the target time slot, that is, the first time slot in the COT, and the other has a larger detection granularity.
- the detection opportunity strategy belongs to the ordinary time slot and is a general detection opportunity strategy.
- Case two The two use the first predefined configuration parameter and the second predefined configuration parameter to determine the target detection opportunity strategy and the ordinary detection opportunity strategy. It is understandable that when the ordinary detection opportunity strategy and the target detection opportunity strategy both pass the pre-defined When the defined manner is configured on the terminal side and the base station side, the first predefined configuration parameter and the second predefined parameter may be input to the terminal / base station together, or may be input to the terminal / base station separately. It is also assumed that the target time slot is the first time slot in the COT. Then the base station and the terminal can configure two detection opportunity policies with different detection granularities in a predefined manner. The smaller detection granularity is the target detection opportunity policy. The big one is the common detection opportunity strategy.
- Case 3 Both determine the target detection opportunity strategy through the first semi-static configuration information, and determine the common detection opportunity strategy through the second predefined configuration parameter; if the first time slot and the last time slot of the COT are target time slots, the terminal
- the target detection opportunity strategy determined by the first semi-static configuration information can be used to perform downlink detection on the first time slot and the last time slot in the COT
- the common detection opportunity strategy determined by the second predefined configuration parameter is used to remove the COT. Detection is performed on time slots other than the first time slot and the last time slot.
- Case 4 The two determine the target detection opportunity strategy through the first predefined configuration parameter, and determine the ordinary detection opportunity strategy through the second semi-static configuration information.
- the base station and the terminal can configure the target detection opportunity policy and the common detection opportunity policy by means of semi-static configuration and predefined settings of high-level signaling.
- the base station and the terminal may determine in advance A granularity threshold, and then the target detection opportunity strategy and the ordinary detection opportunity strategy are determined according to the granularity threshold. For the target time slot, the detection granularity is smaller than the granularity threshold, while for other common time slots, the detection granularity is greater than the granularity threshold.
- the terminal may need to try to detect opportunities based on multiple targets.
- the downlink information sent by the base station can be successfully detected only after the policy performs downlink detection.
- the downlink detection method and the downlink transmission method provided in this embodiment may determine a target detection opportunity policy and a common detection opportunity policy through a method of semi-static configuration and / or a predefined configuration of high-level signaling, and provide a target detection opportunity policy and a common detection opportunity.
- the configuration of policies provides a more flexible way.
- the cooperation of the downlink detection method and the downlink transmission method not only ensures that the base station side has sufficient opportunity to transmit downlink information to the terminal in time, but also ensures that the detection complexity of the terminal is not too high, which improves the user experience on the terminal side.
- Embodiment 4 is a diagrammatic representation of Embodiment 4:
- the downlink detection device 40 includes a time slot determination module 402 and an information detection module 404, where the time slot determination module 402 is used to determine that the current time slot is the target in the COT. And the information detection module 404 is configured to perform downlink detection according to the target detection opportunity policy corresponding to the target time slot.
- the information detection module 404 of the downlink detection device 40 no longer performs downlink detection based on the semi-statically configured detection opportunity policy of the base station that is independent of each time slot in the COT.
- the granularity of the downlink detection of the information detection module 404 and the COT Internal time slots are related: For each time slot in a COT, it can be divided into target time slots and ordinary time slots. For the target time slots, the information detection module 404 can perform downlink detection according to the target detection opportunity strategy. For time slots other than time slots, the information detection module 404 may perform a downlink detection using a common detection opportunity strategy. The detection granularity in the target detection opportunity strategy is smaller than the detection granularity in the ordinary detection opportunity strategy.
- the detection density is greater.
- the detection density is relatively small. It can be understood that the smaller the detection granularity, the greater the corresponding detection density, the greater the detection intensity, and the more detailed the downstream detection; otherwise, the larger the detection granularity, the smaller the corresponding detection density and the smaller the detection intensity. The rougher the downstream detection. Therefore, in this embodiment, the information detection module 404 performs a more vigorous and detailed detection on the target time slot in the COT, while for an ordinary time slot, the information detection module 404 only performs a lesser detection.
- the base station side has a relatively dense downlink transmission opportunity in the target time slot of the COT, and in the ordinary time slot, the downlink transmission opportunity is relatively sparse.
- the detection granularity may include time-domain detection granularity and frequency-domain detection granularity.
- the detection granularity of the target detection opportunity strategy is smaller than that of the ordinary detection opportunity strategy. This may be because the time-domain detection granularity of the target detection opportunity strategy is less than
- the time-domain detection granularity of the common detection opportunity strategy may also be because the frequency-domain detection granularity of the target detection opportunity strategy is smaller than the frequency-domain detection granularity of the ordinary detection opportunity strategy, or it may be because of the time-domain detection granularity and frequency domain of the target detection opportunity strategy.
- the detection granularity is smaller than the granularity corresponding to the common detection opportunity strategy.
- the time-domain detection granularity refers to the ratio of the total number of symbols to the actual number of detected symbols, where the total number of symbols refers to the number of all symbols remaining in the detection period when PDCCH detection is started in one detection period.
- the detection period includes a total of 28 symbols, and the symbols to be detected include all the serial numbers with odd numbers in the first time slot.
- the symbols and symbols with serial numbers in the second time slot are 1, 3, 5, 9 respectively. Therefore, the number of symbols that will be actually detected by the information detection module 404 is 18, and the detection granularity is 28/18, that is, 14/9.
- the time slots included in the detection cycle are not necessarily complete time slots. For example, in an example of this embodiment, when the time slot determination module 402 determines that the target time slot is entered, the target time slot has already In the past half, in this case, the total number of symbols in the detection period is seven.
- the frequency domain detection granularity is the ratio of the total frequency band value to the actual detected frequency band value.
- the total frequency band is the sum of the frequency bands of the candidate frequency bands used for downlink transmission.
- the base station is configured with three BWPs as the downlink detection device 40 as an example. Since the base station may use at least one of BWP1, BWP2, and BWP3 to perform downlink detection to the downlink detection device 40 Information is sent, so the total frequency band sum is the sum of the three BWP frequency bands, and it is assumed here that the total frequency band sum is 80 MHz. It can be understood that the information detection module 404 does not necessarily perform downlink detection on all frequency positions in the three BWPs.
- the information detection module 404 performs downlink detection only on 20MHz in BWP1 and 20MHz in BWP2 during the detection period.
- the actual value of the detected frequency band is 40MHz, so the frequency domain detection granularity is 80/40, which is 2.
- the target time slot refers to a time slot in which the base station in the COT has a high demand for downlink transmission.
- These time slots may be designated by the management in the COT according to experience, for example, the first time slot after the COT is turned on.
- One time slot for example, the last time slot before the end of the COT. Therefore, in an example of this embodiment, the target time slot may include the first time slot and / or the last time slot in the COT. In this case, the position of the target slot in the COT is fixed.
- the base station may notify the downlink detection device 40 whether the subsequent time slot is the target time slot according to the requirements of its own downlink transmission. In this case, the relative position of the target slot in the COT is not fixed.
- the base station and the downlink detection device 40 predetermine the relative position of the target time slot in the COT, and then the base station sends the COT start instruction information to the downlink detection device 40 after the successful execution of the LBT, notifying the time slot determination module 402 that the COT has been started. .
- the terminal can determine whether the current time is the target time slot.
- the base station and the downlink detection device 40 determine in advance that the first time slot in the COT is a target time slot for detailed detection, and the time slot determination module 402 receives the COT start instruction information sent by the base station as long as the current time The time slot when the COT start indication information is received is less than one time slot, the time slot determination module 402 may determine that it is currently in the target time slot.
- the COT start indication information mentioned herein may include one or a combination of a preamble signal, a demodulation reference signal, a measurement reference signal, a synchronization signal, and a predefined sequence signal.
- the preamble signal, the demodulation reference signal, and the synchronization signal are all relatively common signals at present, and the predefined sequence signal is information that is specifically agreed in advance by the base station and the downlink detection device 40 to notify the COT to be turned on.
- the time slot determination module 402 determines that the resource mapping type corresponding to the PDSCH in the recently detected downlink control information DCI indicates that the resource mapping type corresponding to the PDSCH is the second mapping type (mapping type B). It can be understood that if the time domain resource allocation indication PDSCH in the DCI information sent by the base station to the downlink detection device 40 is the first mapping type (mapping type A), then in the subsequent process, the base station may only The first three symbols of each time slot send downlink information to the downlink detection device 40.
- the information detection module 404 only needs to perform downlink detection for the first three symbols of each time slot;
- the time domain resource allocation indicates that the resource mapping type corresponding to the PDSCH is the second mapping type.
- the base station may send downlink information to the downlink detection device 40 at any symbol position in a time slot, and the information is detected.
- the downlink detection required by the module 404 must be more than the first three symbols of each time slot. Therefore, the granularity of the downlink detection of the information detection module 404 is usually smaller than the detection granularity corresponding to the first mapping type.
- the timeslot determining module 402 may determine Before it has entered the destination slot until detecting device 40 receives the downlink time-domain resource allocation type indicates a resource mapping for PDSCH corresponding to a first type of mapping until the DCI information.
- the downlink detection device 40 receives a handover instruction when the information detection module 404 performs a downlink detection using a common detection opportunity strategy.
- the switch instruction is used to instruct the information detection module 404 to switch the detection opportunity policy on which the downlink detection is based to another detection opportunity policy. For example, if the currently used detection opportunity policy is a target detection opportunity policy, the information detection module 404 needs to switch Downstream detection is performed according to the common detection opportunity strategy. On the contrary, if the information detection module 404 is currently using the common detection opportunity strategy, the information detection module 404 needs to switch to perform downlink detection according to the target detection opportunity strategy according to the switching instruction.
- the time slot determination module 402 may determine a target time slot that has currently entered the COT. The target time slot will be consistent until the downlink detection device 40 receives the handover instruction again.
- a specific RNTI scrambled DCI signaling can be used as a handover instruction, and 1 bit can be set in the DCI signaling to indicate whether it is necessary to switch from the currently used detection opportunity strategy to another detection opportunity strategy for detection. .
- the handover identifier if “0” is used as the handover identifier, if the DCI signaling carries the handover identifier “0”, it means that the detection opportunity strategy used for downlink detection needs to be switched: if the current detection opportunity strategy is used, the information detection The module 404 needs to use the target detection opportunity strategy for downstream detection at a subsequent time. If the information detection module 404 currently uses the target detection opportunity strategy, it needs to use a common detection opportunity strategy for downstream detection at a subsequent time.
- the information detection module 404 After the time slot determination module 402 determines that the current time slot is the target time slot in the COT, the information detection module 404 starts downlink detection at the corresponding time-frequency position according to the target detection opportunity strategy corresponding to the target time slot. Of course, if the time slot determination module 402 determines that the current time slot is not the target time slot, the information detection module 404 may directly perform target detection at the corresponding time-frequency position according to a common detection opportunity strategy.
- the downlink detection of the information detection module 404 may be PDCCH detection to detect downlink control information sent by the base station.
- the base station may also directly send data to the downlink detection device 40 after COT is turned on, that is, the data is sent first without sending downlink control information.
- the information detection module 404 downlink detection is blind detection for downlink data.
- the downlink detection device 40 provided in this embodiment may be deployed on a terminal.
- the functions of the time slot determination module 402 and the information detection module 404 may be implemented by a processor of the terminal and a communication device of the terminal.
- the time slot determination module determines that the current time slot is a target time slot in the COT, and then the information detection module performs downlink detection according to the target detection opportunity policy corresponding to the target time slot.
- the base station needs more downlink transmission in some timeslots of the COT, while in other timeslots, there is less need for downlink transmissions, so the downlink detection device and the base station can convert the COT
- the base station within the base station performs timeslots with a higher probability of downlink transmission (such as the first and / or last timeslots in the COT) as the target timeslots.
- the detection granularity of the target detection opportunity strategy is smaller than that of the ordinary detection opportunity strategy.
- the granularity feature allows the information detection module to perform relatively detailed detection on these target time slots when performing downlink detection, thereby providing more downlink transmission opportunities for the base station side; for other time slots in the COT other than the target time slot
- the information detection module can perform detection according to a common detection opportunity strategy, thereby reducing the burden of downlink detection on the terminal side and reducing the power consumption of the downlink detection device.
- Embodiment 5 is a diagrammatic representation of Embodiment 5:
- the downlink sending device 50 includes a sending determining module 502, a location determining module 504, and an information sending module 506.
- the sending determining module 502 is configured to determine a target time slot in a COT. There is a need to send downlink information to the terminal; the position determination module 504 is used to determine the starting time-frequency position of the downlink information based on the target detection opportunity strategy corresponding to the target time slot; the information sending module 506 is used to The terminal sends downlink information.
- each time slot in the COT is divided into a target time slot and an ordinary time slot.
- the transmission determining module 502 may determine that it is currently transmitting
- the downlink information transmission requirement belongs to the downlink transmission requirement of the target time slot or the downlink transmission requirement of the ordinary time slot. Therefore, when the transmission determining module 502 determines whether there is a need to send downlink information to the terminal in the target time slot of the COT, it first needs to determine which time slot or slots are the target time slots.
- the target time slot refers to a time slot in which the downlink transmission device 50 in the COT has a high demand for downlink transmission.
- These time slots may be specified by the management in the COT according to experience, such as the first time slot after the COT is turned on.
- the last time slot before the end of the COT so in some examples, the target time slot may include the first time slot and / or the last time slot in the COT.
- the position of the target slot in the COT is fixed.
- the transmission determining module 502 may notify the terminal whether the subsequent time slot is the target time slot according to the downlink transmission requirement of the terminal. Since the downlink transmission requirement of the downlink transmission device 50 is not fixed, here In this case, the relative position of the target slot in the COT is not fixed.
- the downlink sending device 50 may notify the terminal of the relative position of the target time slot in the COT through high-level signaling in advance, or the management personnel may separately pre-determine the downlink sending device 50 side and The terminal side performs configuration so that the downlink transmitting device 50 and the terminal determine the relative position of the target time slot in the COT. It is assumed that, in an example of this embodiment, the downlink sending device 50 and the terminal determine in advance that the target time slot is the first time slot in the COT.
- the transmission determining module 502 may determine whether it is currently in the target time slot according to the time of the current time and the start time of the COT.
- the downlink sending device 50 after the downlink sending device 50 successfully executes LBT and turns on the COT, it can send the COT start instruction information to the terminal, so that the terminal can also know the start of the COT.
- the start time thereby determining the position of the target time slot by combining the start time of the COT and the predetermined relative position of the target time slot in the COT.
- the COT start indication information mentioned herein may include one or a combination of a preamble signal, a demodulation reference signal, a measurement reference signal, a synchronization signal, and a predefined sequence signal.
- the preamble signal, the demodulation reference signal, and the synchronization signal are all relatively common signals at present, and the predefined sequence signal is information that is specifically agreed in advance by the downlink sending device 50 and the terminal to notify the COT to be turned on.
- the transmission determination module 502 may determine whether the current time slot is the target time slot according to whether its current transmission demand is dense. For example, at a certain time, the transmission determination module 502 determines that the current time slot For a period of time from time to time, if the user needs to send downlink information to the terminal more frequently, the sending determination module 502 may determine that the time slots in this period belong to the target time slot. In this case, the determination module 502 needs to send an instruction to the terminal so that the terminal can determine that the current time slot belongs to the target time slot:
- the downlink sending device 50 agrees with the terminal in advance, assuming that the terminal receives the time domain resource allocation indication PDSCH corresponding to the second mapping type DCI information at time t1, and at t2
- the time domain resource allocation indication that the resource mapping type corresponding to the PDSCH is received at the moment is DCI information of the first mapping type
- all time slots between t1 and t2 belong to the target time slot. Therefore, in this case, when the transmission determining module 502 determines that the target slot is currently entered, it may send to the terminal a DCI indicating that the resource mapping type corresponding to the PDSCH is the second mapping type.
- the downlink sending device 50 agrees with the terminal in advance. If the terminal originally uses a common detection opportunity strategy for downlink detection and receives a handover instruction sent by the terminal at a certain time, the terminal may It is determined that the target time slot is entered from the current moment until the handover instruction sent by the downlink sending device 50 is received again.
- the downlink transmitting device 50 may scramble DCI signaling as a switching indication through a specific RNTI. A 1 bit may be set in the DCI signaling to indicate whether it is necessary to switch from the currently used detection opportunity policy to another detection opportunity.
- Strategy for detection For example, take "0" as the handover identifier.
- the DCI signaling carries the handover identifier "0"
- the detection opportunity strategy used for downlink detection needs to be switched: If the current detection opportunity strategy is used, the terminal needs Use the target detection opportunity strategy for downstream detection at subsequent times. If the terminal currently uses the target detection opportunity strategy, the terminal needs to use the ordinary detection opportunity strategy for downstream detection at subsequent times.
- "1" may also be set as the switching identifier.
- the position determination module 504 can determine the time and frequency position of the transmission start of the downlink information according to the target detection opportunity strategy. Obviously, the transmission start time The frequency location includes the time domain location where the information is sent and the frequency domain location where the information is sent. If the downlink sending device 50 determines that it needs to send downlink information to the terminal in the ordinary time slot, it may determine the start time and frequency position of the downlink information according to the common detection opportunity strategy corresponding to the ordinary time slot.
- the downlink sending device 50 determines the sending time and frequency position of the downlink information according to the target detection opportunity policy or the sending location of the downlink information according to the common detection opportunity policy, the sending start time determined by the position determination module 504
- the frequency position must be in the starting time-frequency position to be detected indicated by the target detection opportunity strategy / common detection opportunity strategy.
- the detection granularity in the target detection opportunity strategy is smaller than the detection granularity in the ordinary detection opportunity strategy. Therefore, when the terminal performs downlink detection according to the target detection opportunity strategy, the detection density is greater. When the terminal performs detection according to the ordinary detection opportunity strategy, the detection density is relatively high. small. It can be understood that the smaller the detection granularity of the terminal, the greater the corresponding detection density, and the more opportunities for the information sending module 506 side to send downlink information; conversely, the larger the detection granularity of the terminal, the greater the corresponding detection density. The smaller, the rarer the opportunity available for the information sending module 506 to send downlink information.
- the above detection granularity may include time-domain detection granularity and frequency-domain detection granularity.
- the detection granularity of the target detection opportunity strategy is smaller than that of the ordinary detection opportunity strategy. This may be because the time-domain detection granularity of the target detection opportunity strategy is smaller than that of the ordinary detection opportunity strategy.
- the time-domain detection granularity may also be because the frequency-domain detection granularity of the target detection opportunity strategy is smaller than the frequency-domain detection granularity of the ordinary detection opportunity strategy, or it may be because the time-domain detection granularity and frequency-domain detection granularity of the target detection opportunity strategy are smaller than ordinary The granularity corresponding to the detection opportunity strategy.
- the time-domain detection granularity refers to the ratio of the total number of symbols to the actual number of detected symbols, where the total number of symbols refers to the number of all symbols remaining in the detection period when PDCCH detection is started in one detection period. If there are two time slots in a detection period, there is no doubt that the detection period includes a total of 28 symbols, and the symbols to be detected include all symbols with odd sequence numbers in the first time slot and the second time slot.
- the internal serial numbers are symbols of 1, 3, 5, 9 respectively. Therefore, there are actually 18 symbols that the terminal will perform downlink detection, and the detection granularity is 28/18, that is, 14/9.
- the time slots included in the detection period are not necessarily all complete time slots. For example, in an example of this embodiment, when the terminal determines to enter the target time slot, half of the target time slot has passed. In this case, the total number of symbols in the detection period is seven.
- the frequency domain detection granularity is the ratio of the total frequency band value to the actual detected frequency band value.
- the total frequency band is the sum of the frequency bands of the candidate frequency bands used for downlink transmission.
- the following transmission device 50 configures three BWPs for the terminal as an example. Because the information transmission module 506 may use at least one of BWP1, BWP2, and BWP3 to perform downlink to the terminal. Information is sent, so the total frequency band sum is the sum of the three BWP frequency bands, and it is assumed here that the total frequency band sum is 80 MHz. It can be understood that the terminal does not necessarily perform downlink detection on all frequency positions in the three BWPs. Assuming that the terminal performs downlink detection only on 20MHz in BWP1 and 20MHz in BWP2 during the detection period, the actual frequency band detected The value is 40MHz, so the frequency domain detection granularity is 80/40, which is 2.
- the information transmission module 506 may send downlink information to the terminal at the transmission start time-frequency position.
- the downlink sending device 50 sends DCI information to the terminal first after successfully performing LBT and turning on a COT. Therefore, the downlink information sent by the information sending module 506 to the terminal at the determined transmission start time-frequency position may be DCI information.
- the information sending module 506 may also send data to the terminal directly after COT is turned on, that is, the data is sent first without sending downlink control information. In this case, the information sending module 506 The downlink information sent to the terminal at the corresponding transmission start time-frequency position is downlink data.
- the downlink sending device 50 may be deployed on the base station side, for example, on the base station.
- the functions of the transmission determination module 502 and the position determination module 504 may be implemented by the base station processor, and the functions of the information transmission module 506 may be implemented by the base station. Communication unit.
- the downlink sending device determines that there is a need to send downlink information to a terminal in a target time slot of a COT, and determines a starting time-frequency position of sending downlink information based on a target detection opportunity policy corresponding to the target time slot, and then Send downlink information to the terminal at the determined transmission start time-frequency position.
- the downlink transmitting device and the terminal can respectively perform downlink information transmission and downlink detection according to two detection opportunity policies with different detection granularities, so that the downlink transmitting device can send more and more frequent time slots in the downlink.
- the downlink sending method provided in this embodiment considers both the downlink transmission efficiency of the downlink sending device and the power consumption on the terminal side. Compared with the methods in related technologies, it can effectively improve the user experience on the terminal side.
- Embodiment 6 is a diagrammatic representation of Embodiment 6
- This embodiment will provide a downlink detection device and a downlink sending device. Please refer to a schematic structural diagram of the downlink detecting device 60 shown in FIG. 6 and a schematic structural diagram of the downlink sending device 70 shown in FIG. 7:
- the downlink detection device 60 includes, in addition to a time slot determination module 602 for determining that the current time slot is a target time slot in the COT, and an information detection module 604 for performing downlink detection according to a target detection opportunity policy corresponding to the target time slot. It includes a first configuration module 606, which is configured to determine a target detection opportunity policy.
- the downlink sending device 70 includes a sending determination module 702 for determining that there is a need to send downlink information to the terminal in a target time slot of the COT, and a method for determining the start of sending downlink information based on a target detection opportunity policy corresponding to the target time slot.
- the second configuration module 708 is also included, where the second configuration module 708 is used to determine target detection Opportunity strategy.
- the information detection module 604 in this embodiment matches the target time slot in the COT according to the target detection opportunity policy Perform detection, and perform downlink detection on other common time slots except the target time slot in the COT according to the common detection opportunity strategy.
- the transmission determination module 702 determines that the information transmission module 706 needs to send downlink information in the target time slot
- the position determination module 704 needs to determine the starting time-frequency position of the downlink information transmission based on the target detection opportunity strategy, and if the information transmission module 706 needs to send the downlink information to the downlink detection device 60 in a common time slot other than the target time slot in the COT, Then, the position determination module 704 needs to determine a transmission start time-frequency position of the downlink transmission based on a common detection opportunity strategy. Therefore, before the information detection module 604 uses the target detection opportunity strategy for downlink detection, the first configuration module 606 needs to determine the target detection opportunity strategy.
- the information detection module 604 uses a common detection opportunity strategy for downlink. Before detection, the first configuration module 606 needs to determine a common detection opportunity policy. Correspondingly, before the information sending module 706 performs downlink transmission based on the target detection opportunity policy, the second configuration module 708 needs to determine a target detection opportunity policy. Before the module 706 performs downlink transmission based on the common detection opportunity strategy, the second configuration module 708 needs to determine the common detection opportunity strategy.
- the manner in which the first configuration module 606 and the second configuration module 708 determine the target detection opportunity policy is described first:
- the second configuration module 708 may configure the target detection opportunity policy to the downlink detection device 60 in a semi-static manner through high-level signaling.
- the second configuration module 708 first determines the first semi-static configuration information, which may indicate target detection. Opportunity strategy. After determining the first semi-static configuration information, the downlink sending device 70 may send the first semi-static configuration information to the downlink detection device 60. Subsequently, the second configuration module 708 and the first configuration module 606 may both The static configuration information determines the target detection opportunity strategy. In some examples of this embodiment, the downlink sending device 70 may send the first semi-static configuration information to the downlink detection device 60 in the first symbol in the first time slot in the COT.
- the first semi-static configuration information may include a symbol indication and / or a frequency band indication, where the symbol indication is used to indicate whether each symbol in the target time slot needs to be detected in the downlink, and the frequency band indication is used It is used to indicate whether candidate frequency bands are needed for downlink detection in the target time slot.
- the symbol indication may be a symbol bitmap bitmap corresponding to each symbol in the target slot. For example, if n symbols are included in the target slot, the symbol bitmap will also include n bits, each bit uniquely corresponds to a symbol .
- the frequency band indication may also be a frequency band bitmap. Each candidate frequency band corresponds to a bit in the frequency band bitmap, and is used to indicate whether downlink detection is required for the candidate frequency band in the target time slot.
- the first semi-static configuration information may include a CORESET parameter and a search space parameter.
- the meaning of the search space parameter is related to the downlink sending device 70 in the related art through high-level information. Let the meaning of the search space parameter sent to the downlink detection device 60 be somewhat different: in this example, the time slot offset indicated by the search space parameter is the time slot offset relative to the start time of the COT.
- this embodiment also provides A scheme that allows the first configuration module 606 and the second configuration module 708 to determine a target detection opportunity strategy:
- the first configuration module 606 and the second configuration module 708 determine the target detection opportunity policy in a predefined manner.
- the second configuration module 708 may receive the first and defined configuration parameters, and then determine the target detection opportunity according to the first predefined configuration parameter.
- the first predefined configuration parameter may be input to the second configuration module 708 by a manager.
- the first configuration module 606 may also determine the target detection opportunity strategy by acquiring the first predefined configuration parameters.
- the first configuration module 606 receives the first predefined configuration parameters input by a program personnel during the design and production stages of the downlink detection device 60 and performs Storage; of course, the first predefined configuration parameters can also be sent by the programmer to the first configuration module 606 in the form of a network during the user use phase, such as carrying the first predefined configuration parameters in the upgrade file during system upgrade Middle sends to the first configuration module 606.
- the second configuration module 708 and the first configuration module 606 also have the following two methods when determining the general detection opportunity strategy:
- the second configuration module 708 determines the second semi-static configuration information, then determines a common detection opportunity policy according to the second semi-static configuration information, and sends the second semi-static configuration information to the first configuration module 606. After receiving the second predefined configuration parameter, the first configuration module 606 can determine a common detection opportunity policy for detecting a common time slot in the OT according to the second semi-static configuration information.
- Manner 2 The second configuration module 708 and the first configuration module 606 respectively receive a second predefined configuration parameter, and then determine a common detection opportunity policy according to the second predefined configuration parameter.
- the second semi-static configuration information may also include a symbol indication and a frequency band indication.
- the second semi-static configuration information includes a symbol bitmap corresponding to a symbol in a common time slot, and / or the second semi-static configuration information also includes a frequency band bitmap corresponding to the same candidate frequency band.
- the second semi-static configuration information may also indicate the time-frequency position to be detected in an ordinary time slot by using the CORESET parameter and the search space parameter.
- the second semi-static configuration information The time slot offset indicated by the search space parameter is the time slot offset relative to the start time of the COT.
- Case 1 The two use the first semi-static configuration information and the second semi-static configuration information to determine the target detection opportunity policy and the common detection opportunity policy; in this case, the first semi-static configuration information and the second semi-static configuration
- the information may be sent by the downlink sending device 70 to the downlink detecting device 60 at the same time. It is assumed that the target time slot is the first time slot in the COT, and the ordinary time slot is a time slot other than the first time slot in the COT. In this case, the downlink sending device 70 may configure two detection opportunity policies to the downlink detection device 60 through high-level signaling.
- the detection granularity belongs to the target time slot, that is, the first time slot in the COT.
- a larger detection opportunity strategy belongs to the ordinary time slot, which is an ordinary detection opportunity strategy.
- Case two The two use the first predefined configuration parameter and the second predefined configuration parameter to determine the target detection opportunity strategy and the ordinary detection opportunity strategy. It is understandable that when the ordinary detection opportunity strategy and the target detection opportunity strategy both pass the pre-defined
- the first predefined configuration parameter and the second predefined parameter may be input to the downlink detection device 60 / downlink transmission device 70 together, or may be input to the downlink separately.
- the second configuration module 708 and the first configuration module 606 can configure two detection opportunity policies with different detection granularities in a predefined manner.
- the target detection opportunity strategy, the larger detection granularity is the ordinary detection opportunity strategy.
- Case 3 Both determine the target detection opportunity strategy through the first semi-static configuration information, and determine the common detection opportunity strategy through the second predefined configuration parameter; if the first time slot and the last time slot of the COT are the target time slots, the first A configuration module 606 may perform downlink detection on the first time slot and the last time slot in the COT according to the target detection opportunity policy determined by the first semi-static configuration information, and use the common detection opportunity policy determined by the second predefined configuration parameter. Detect other time slots in the COT except the first time slot and the last time slot.
- Case 4 The two determine the target detection opportunity strategy through the first predefined configuration parameter, and determine the ordinary detection opportunity strategy through the second semi-static configuration information.
- the second configuration module 708 and the first configuration module 606 can configure the target detection opportunity policy and the general detection opportunity policy by means of semi-static configuration and predefined settings of high-level signaling, but in some examples of this embodiment Among them, the second configuration module 708 and the first configuration module 606 may determine a granularity threshold in advance, and then determine the target detection opportunity strategy and the ordinary detection opportunity strategy according to the granularity threshold. For the target time slot, the detection granularity is smaller than the granularity threshold, while for other common time slots, the detection granularity is greater than the granularity threshold.
- the downlink detection device 60 may need to try The downlink information sent by the downlink sending device 70 can be successfully detected only after downlink detection is performed according to multiple target detection opportunity strategies. These multiple target detection opportunity strategies are determined based on a predetermined granularity threshold.
- the downlink detection device 60 in this embodiment may be deployed on a terminal.
- the functions of the time slot determination module 602 and the information detection module 604 may be implemented by the processor of the terminal and the communication unit.
- the functions of the first configuration module 606 may be It is implemented by the processor of the terminal, and may also be implemented by the processor of the terminal and the communication unit.
- the downlink sending device 70 may be deployed on a base station.
- the functions of the transmission determining module 702 and the position determining module 704 may be implemented by a base station processor, and the functions of the information sending module 706 may be implemented by a communication unit of the base station.
- the function of the second configuration module 708 may be implemented by the processor of the base station, or may be implemented by the processor and the communication unit of the base station together.
- the downlink detection device and the downlink transmission device provided in this embodiment may determine a target detection opportunity policy and a common detection opportunity policy by means of semi-static configuration and / or a predefined configuration of high-level signaling, and provide a target detection opportunity policy and a common detection opportunity.
- the configuration of policies provides a more flexible way.
- the cooperation of the downlink detection method and the downlink transmission method not only ensures that the downlink transmitting device side has sufficient opportunities to transmit downlink information to the downlink detection device in time, but also ensures that the detection complexity of the downlink detection device is not too high, which improves User experience on the downlink detection device side.
- Embodiment 7 is a diagrammatic representation of Embodiment 7:
- the storage medium may store one or more computer programs that can be read, compiled, and executed by one or more processors.
- the storage medium may store downlink data.
- the downlink sending program may be used by one or more processors to execute the steps of implementing any one of the downlink sending methods described in the foregoing second to third embodiments.
- the communication system 8 includes a terminal 90 and a base station 10. The following briefly describes the structure of the terminal 90 and the structure of the base station 10 with reference to FIGS. 9 and 10, respectively:
- the terminal 90 includes a first processor 91, a first memory 92, and a first communication bus 93 for connecting the first processor 91 and the first memory 92.
- the first memory 92 may be the foregoing storage medium storing a downlink detection program.
- the first processor 91 may read the downlink detection program stored in the first memory 92, compile it, and execute steps for implementing any one of the downlink detection methods described in the first or third embodiment.
- the terminal 90 in the first or third embodiment For details of the method for implementing the downlink detection by the terminal 90 in the first or third embodiment, refer to the description of the foregoing embodiment, and details are not described herein again.
- the base station 10 includes a second processor 11, a second memory 12, and a second communication bus 13 for connecting the second processor 11 and the second memory 12.
- the second memory 12 may be the foregoing storage medium storing a downlink sending program.
- the second processor 11 may read the downlink transmission program stored in the second memory 12, compile it, and execute steps for implementing any one of the downlink transmission methods described in the second or third embodiment.
- This embodiment provides a communication system, a terminal, a base station, and a storage medium.
- the terminal can use the common detection opportunity strategy to detect, and for target time slots in the COT, the terminal can use the target detection opportunity strategy for detection.
- the detection granularity of the target detection opportunity strategy is smaller than the detection granularity of the ordinary detection opportunity strategy, that is, the detection density is greater, so the base station has a denser transmission opportunity in the target time slot. You can get a transmission opportunity by waiting time, and you can complete the sending of downlink information at the corresponding time-frequency position.
- the detection granularity of the terminal is large and the detection density is small. Therefore, the detection workload of the terminal is relatively small, which is conducive to reducing the power consumption caused by the downlink detection to the terminal.
- Embodiment 8 is a diagrammatic representation of Embodiment 8
- This embodiment will describe a communication system, a base station, a terminal, and a downlink transmission method and a terminal-side downlink detection method provided in the present disclosure with several specific examples:
- the downlink information sent by the base station to the terminal in this embodiment is downlink control information, that is, the downlink detection on the terminal side is actually downlink PDCCH detection.
- the base station and the terminal agree in advance that the target time slot is the first time slot in the COT.
- the detection opportunity policy mentioned here may include the detection opportunity policy of the first time slot in the COT, or it may include the first division of the COT. Detection opportunity policies for time slots other than one time slot, or both detection opportunity policies.
- the base station configures the time-frequency position of the PDCCH detection by the terminal through high-level signaling.
- the specific configuration includes the following situations:
- Case 2 This configuration includes two PDCCH detection opportunity strategies.
- the first detection opportunity strategy (target detection opportunity strategy) is used for the first time slot in the COT, and the second detection opportunity strategy (general detection opportunity strategy) is used for COT internal division. Time slots other than the first time slot.
- the base station may configure a time-frequency domain position to be detected through high-level signaling including a CORESET parameter and a search space parameter.
- the base station can perform CORESET configuration in units of 20 MHz, that is, one CORESET is configured on each 20 MHz bandwidth.
- the base station can configure the detection period to be 1 ms, and at the same time indicate that each symbol in the detection period is a symbol to be detected downstream.
- the base station may also be configured to indicate that it may only perform downlink transmission on symbols with an odd sequence number in the detection period, or indicate that the terminal itself may only have symbols with an even number in the detection period.
- the DCI information is transmitted.
- the base station may send a symbol bitmap to the terminal at the first symbol position of the first time slot after the LBT processing is successfully performed, so as to indicate to the terminal which symbols need to be subjected to PDCCH detection.
- the base station can use special high-level signaling to configure the candidate symbol positions for the base station to perform downlink transmission on the first time slot in the COT;
- the time slot can be configured by the base station through the configuration parameters of the existing PDCCH resources.
- the base station After the base station configures the detection opportunity policy to the terminal, it can successfully perform LBT and send DCI information, and then select the nearest symbol from the configured candidate symbol positions for DCI information transmission.
- the base station since the target time slot refers to the first time slot in the COT, after the first time slot of the COT ends, the base station will switch to using the second detection opportunity strategy to determine the DCI transmission start time frequency. Position, at that time, the terminal should also switch to PDCCH detection according to the second detection opportunity policy:
- the base station may send the COT start instruction information to the terminal at the moment when the COT is turned on, so that the terminal may determine when to switch to the second detection opportunity policy according to the COT start instruction information.
- the COT start indication information may include at least one of a preamble signal, a demodulation reference signal, a measurement reference signal, a synchronization signal, and a predefined sequence signal.
- the base station may also send a handover instruction to the terminal in the last symbol of the first time slot of the COT or the first symbol of the second time slot, so that the terminal can use the first detection opportunity strategy. Switch to the second detection opportunity strategy.
- the base station uses a special DCI format or a proprietary RNTI scrambled DCI to notify the terminal to switch the detection opportunity policy, or sets 1 bit in the DCI information to specifically instruct the switching between the two detection opportunity policies.
- the base station may also send DCI information indicating that the resource mapping type corresponding to the PDSCH is the first mapping type to the terminal to instruct the terminal to switch to using the second detection opportunity policy for PDCCH detection. .
- the first mapping type that is, mapping type A.
- the base station may only use the first three symbols of each time slot. The downlink information is transmitted. Therefore, in this example, the terminal needs to perform downlink detection on the first three symbols of each time slot according to the second detection opportunity policy.
- the base station can ensure that the base station can send downlink control information as soon as possible after the LBT processing is successful, thereby improving spectrum utilization; on the other hand, it can also ensure that the base station can flexibly adjust the candidate symbol positions in other time slots in the COT. .
- the detection opportunity strategy here may include the detection opportunity strategy of the first time slot in the COT, or it may include the first time division within the COT. Detection opportunity policies for time slots other than time slots, or both detection opportunity policies.
- the terminal obtains the start time-frequency position to be detected by the PDCCH through high-level signaling.
- the terminal obtains the detection opportunity policy for the first time slot in the COT through high-level signaling; for example, the base station configures the terminal with the PDCCH detection start time of the first time slot in the COT by defining a proprietary parameter. Frequency position. For example, if the high-level signaling configures the starting symbol position parameter as 10100101001010, the terminal can position the symbols in the first time slot of the symbol with the symbol positions of 0, 2, 5, 7, 10, and 12 to be detected by the PDCCH.
- the base station specifies the detection opportunity strategy for the first time slot by using the PDCCH parameters of the existing NR authorized carrier: the terminal determines the detection period to be 10 ms by receiving the monitoring space corresponding to the search space configured by the high-level signaling and the IE Peridicity And Offset parameter.
- the time slot offset is 0, and the terminal blindly detects the PDCCH in the first time slot in which the base station starts to send data.
- the terminal may obtain two detection opportunity policies through high-level signaling, where one with a small detection granularity is used for the first time slot in the COT, and the other is used for other time slots in the COT.
- the PDCCH detection with one set of parameters has a small time-frequency granularity, which is used to detect the first time slot after the base station has successfully completed LBT, and the PDCCH detection with the other set of parameters has a large granularity, which is used for the second time after the base station has successfully performed LBT.
- PDCCH detection in time slots and subsequent time slots are examples of the PDCCH detection with one set of parameters.
- a base station configures two search spaces for a terminal, one monitoring space in Internet Explorer, and the Period parameter indicates that the detection period is 10 ms, the time slot offset is 0, and the bitmap in the Monitoring Symbol Within slot parameter is 01010101010101. , Indicates that the detected symbol is a sequence number in the time slot (assuming that the sequence number of the symbol in the time slot starts from 0 in this embodiment) is an odd number of symbols.
- the Monitoring and SlotPeriodicity and Offset parameters in IE indicate that the detection period is 2ms, the slot offset is 1, and the bitmap in the MonitoringSymbolsWithin Slot parameter is 10000001000000, indicating that the detected symbols are symbol 0 and symbol 7.
- the former configuration is used for the first time slot in the COT, and the latter configuration is used for other time slots in the COT.
- the terminal may also obtain the detection opportunity policy for the other time slots in the COT except for the first time slot through high-level signaling.
- the terminal may obtain another detection opportunity policy in a predefined manner.
- the base station can configure multiple CORESETs at different frequency domain locations, and then the base station determines the number of CORESETs that are ultimately used for downlink transmission according to the results of the LBT. For other time slots in the COT, the number of configured CORESETs in the same frequency domain is less than the number of CORESETs in the first time slot.
- the base station configures four CORESETs through high-level signaling.
- the four CORESETs may belong to different BWPs, that is, the BWP IDs are different, but the frequency domain positions of the CORESETs do not overlap, that is, each CORESET is located in a different frequency domain of 20MHz.
- the base station performs LBT processing on this 80MHz bandwidth, and the granularity of each execution can be 20MHz.
- the base station finally determines the number and location of CORESETs to be sent according to the CORESET corresponding to the frequency domain position of the successful 20MHz bandwidth of the LBT. Assuming that the 20 MHz bandwidth base stations corresponding to the first and third CORESETs perform LBT successfully, the base station performs downlink transmission on these two CORESETs.
- the CORESET in the first three time slots of a channel occupation period that is, the set of downlink control channel search patterns is shown in Figure 12:
- the base station configures CORESET1 in the first 20MHz on a BWP through high-level signaling.
- CORESET2 is in the second 20MHz on the BWP
- CORESET3 is in the third 20MHz on the BWP; in the time domain, the base station configures search1 space1 corresponding to CORESET1, the sending cycle is 1ms, and the slot offset is 0;
- Example 3 can also increase the downlink transmission opportunity of the first time slot after the base station successfully performs LBT, reduce the complexity of PDCCH detection by the terminal in subsequent time slots, and thus reduce the power consumption of the terminal.
- the downlink detection method, downlink transmission method, device, base station, terminal, and storage medium provided in the embodiments of the present disclosure can be applied not only to 5G communication systems, but also to any future communication. System.
- Such software may be distributed on a computer-readable medium, executed by a computing device, and in some cases, the steps shown or described may be performed in a different order than described here, and the computer-readable medium may include computer storage Medium (or non-transitory medium) and communication medium (or transient medium).
- computer storage Medium includes volatile and non-volatile implemented in any method or technology used to store information such as computer-readable instructions, data structures, program modules or other data. Removable, removable and non-removable media.
- Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or may Any other medium used to store desired information and which can be accessed by a computer.
- a communication medium typically contains computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and may include any information delivery medium . Therefore, the present disclosure is not limited to any particular combination of hardware and software.
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Abstract
Description
Claims (23)
- 一种下行检测方法,包括:确定当前时隙为信道占用期COT中的目标时隙;根据所述目标时隙对应的目标检测机会策略进行下行检测,所述目标检测机会策略的检测粒度小于普通检测机会策略的检测粒度,所述普通检测机会策略为所述COT中除所述目标时隙外其他时隙的检测机会策略。
- 如权利要求1所述的下行检测方法,其特征在于,所述根据所述目标时隙对应的目标检测机会策略进行下行检测之前,还包括:接收基站发送的第一半静态配置信息,根据所述第一半静态配置信息确定所述目标检测机会策略;或,接收第一预定义配置参数,根据所述第一预定义配置参数确定所述目标检测机会策略。
- 如权利要求2所述的下行检测方法,其特征在于,所述第一半静态配置信息中包括用于指示所述目标时隙中的各符号是否需要进行下行检测的符号指示和/或用于指示在所述目标时隙中是否需要对各候选频段进行下行检测的频段指示;或,所述第一半静态配置信息中包括控制资源集CORESET参数和搜索空间search space参数,所述search space参数所指示的时隙偏移量为相对所述COT起始时刻的时隙偏移量。
- 如权利要求3所述的下行检测方法,其特征在于,所述符号指示为同所述目标时隙中各符号对应的符号位图bitmap;所述频段指示为同各候选频段对应的频段bitmap。
- 如权利要求2所述的下行检测方法,其特征在于,所述根据所述目标时隙对应的目标检测机会策略进行下行检测之前,还包括:接收所述基站发送的第二半静态配置信息,根据所述第二半静态配置信息确定所述普通检测机会策略;或,接收第二预定义配置参数,根据所述第二预定义配置参数确定所述普通检测机会策略。
- 如权利要求1所述的下行检测方法,其特征在于,所述根据所述目标时隙对应的目标检测机会策略进行下行检测包括:根据所述目标时隙对应的目标检测机会策略进行物理下行链路控制信道PDCCH检测。
- 如权利要求1所述的下行检测方法,其特征在于,检测粒度包括时域检测粒度和频域检测粒度;所述目标检测机会策略的时域检测粒度小于所述普通检测机会策略的时域检测粒度,和/或,所述目标检测机会策略的频域检测粒度小于所述普通检测机会策略的 频域检测粒度。
- 如权利要求1-7任一项所述的下行检测方法,其特征在于,所述目标时隙包括所述COT中的第一个时隙和/或所述COT中的最后一个时隙。
- 如权利要求1-7任一项所述的下行检测方法,其特征在于,所述确定当前时隙为信道占用期COT中的目标时隙的方式包括以下几种中的任意一种:第一种:根据接收COT起始指示信息的时刻以及预先确定的目标时隙在所述COT内的相对位置确定当前时刻处于所述COT中的目标时隙;第二种:确定最近检测到的下行链路控制信息中的时域资源分配指示物理下行共享信道PDSCH对应的资源映射类型为第二映射类型;第三种:在使用普通检测机会策略进行下行检测时接收到指示切换检测机会策略的切换指示。
- 如权利要求9所述的下行检测方法,其特征在于,所述COT起始指示信息包括前导信号、解调参考信号、测量参考信号、同步信号、预定义序列信号中的至少一种。
- 一种下行发送方法,包括:确定在COT的目标时隙存在向终端发送下行信息的需求;基于所述目标时隙对应的目标检测机会策略确定下行信息的发送起始时频位置,所述目标检测机会策略用于指示终端的下行检测,所述目标检测机会策略的检测粒度小于所述COT中除所述目标时隙外的普通检测机会策略的检测粒度;在所述发送起始时频位置向所述终端发送下行信息。
- 如权利要求11所述的下行发送方法,其特征在于,所述基于所述目标时隙对应的目标检测机会策略确定下行信息的发送起始时频位置之前,还包括:确定第一半静态配置信息,根据所述第一半静态配置信息确定所述目标检测机会策略,并将所述第一半静态配置信息发送给所述终端。
- 如权利要求12所述的下行发送方法,其特征在于,所述第一半静态配置信息中包括用于指示所述目标时隙中的各符号是否需要进行下行检测的符号指示和/或用于指示在所述目标时隙中是否需要对各候选频段进行下行检测的频段指示;或,所述第一半静态配置信息中包括控制资源集CORESET参数和搜索空间search space参数,所述search space参数所指示的时隙偏移量为相对所述COT起始时刻的时隙偏移量。
- 如权利要求13所述的下行发送方法,其特征在于,所述基于所述目标时隙对应的目标检测机会策略确定下行信息的发送起始时频位置之前,还包括:确定第二半静态配置信息,根据所述第二半静态配置信息确定所述普通检测机会策略,并将所述第二半静态配置信息发送给所述终端;或,接收第二预定义配置参数,根据所述第二预定义配置参数确定所述普通检测机会策略。
- 如权利要求11所述的下行发送方法,其特征在于,所述在所述发送起始时频位置向所述终端发送下行信息包括:在所述发送起始时频位置通过PDCCH向所述终端发送下行链路控制信息。
- 如权利要求11所述的下行发送方法,其特征在于,检测粒度包括时域检测粒度和频域检测粒度;所述目标检测机会策略的时域检测粒度小于所述普通检测机会策略的时域检测粒度,和/或,所述目标检测机会策略的频域检测粒度小于所述普通检测机会策略的频域检测粒度。
- 如权利要求11-16任一项所述的下行发送方法,其特征在于,所述目标时隙包括所述COT中的第一个时隙和/或所述COT中的最后一个时隙。
- 如权利要求11-16任一项所述的下行发送方法,其特征在于,所述基于所述目标时隙对应的目标检测机会策略确定下行信息的发送起始时频位置之前,还包括:在所述COT的起始时刻向所述终端发送COT起始指示信息,所述COT起始指示信息用于终端确定目标时隙;或,向所述终端发送下行链路控制信息,所述下行链路控制信息中的时域资源分配指示PDSCH对应的资源映射类型为第二映射类型;或,向所述终端发送切换指示,所述切换指示用于指示所述终端从采用普通检测机会策略进行下行检测切换到采用目标检测机会策略进行下行检测。
- 一种下行检测装置,所述下行检测装置包括:时隙确定模块,用于确定当前时隙为信道占用期COT中的目标时隙;信息检测模块,用于根据所述目标时隙对应的目标检测机会策略进行下行检测,所述目标检测机会策略的检测粒度小于普通检测机会策略的检测粒度,所述普通检测机会策略为所述COT中除所述目标时隙外其他时隙的检测机会策略。
- 一种下行发送装置,包括:发送确定模块,用于确定在COT的目标时隙存在向终端发送下行信息的需求;位置确定模块,用于基于所述目标时隙对应的目标检测机会策略确定下行信息的发送起始时频位置,所述目标检测机会策略用于指示终端的下行检测,所述目标检测机会策略的检测粒度小于所述COT中除所述目标时隙外的普通检测机会策略的检测粒度;信息发送模块,用于在所述发送起始时频位置向所述终端发送下行信息。
- 一种终端,其特征在于,包括第一处理器、第一存储器及第一通信总线;所述第一通信总线用于实现第一处理器和第一存储器之间的连接通信;所述第一处理器用于执行第一存储器中存储的一个或者多个程序,以实现如权利要求 1至10中任一项所述的下行检测方法的步骤。
- 一种基站,其特征在于,包括第二处理器、第二存储器及第二通信总线;所述第二通信总线用于实现第二处理器和第二存储器之间的连接通信;所述第二处理器用于执行第二存储器中存储的一个或者多个程序,以实现如权利要求11至18中任一项所述的下行发送方法的步骤。
- 一种通信系统,其特征在于,包括如权利要求21所述的终端以及如权利要求22所述的基站。
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| EP4122245A4 (en) * | 2020-03-20 | 2024-08-07 | Qualcomm Incorporated | LOW COMPLEXITY PHYSICAL DOWNLINK CONTROL CHANNEL |
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| JP7381588B2 (ja) * | 2018-09-14 | 2023-11-15 | オッポ広東移動通信有限公司 | リソース決定及び設定方法、装置、端末、ネットワーク装置 |
| US20220110152A1 (en) * | 2019-02-12 | 2022-04-07 | Apple Inc. | Frame-based equipment mode of operation for new radio-unlicensed systems and networks |
| CN116865927A (zh) * | 2019-08-14 | 2023-10-10 | 华为技术有限公司 | 用于灵活的控制信道监听的装置和方法 |
| WO2021088262A1 (zh) | 2019-11-08 | 2021-05-14 | Oppo广东移动通信有限公司 | 确定时隙格式的方法及装置 |
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| EP3829236A4 (en) | 2021-10-13 |
| US20210168780A1 (en) | 2021-06-03 |
| EP3829236A1 (en) | 2021-06-02 |
| EP3829236B1 (en) | 2025-10-29 |
| CN110769501B (zh) | 2023-09-29 |
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| MX2021000991A (es) | 2021-04-12 |
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