Patent Application
20230040527
The present disclosure relates to the field of communications, and in particular, to a transmission acknowledgment method, a terminal device, and a transmission node.
In a future communications system, a shared spectrum, for example, in an unlicensed band, can be used as a supplement to a licensed band to help an operator expand a service. To keep consistent with the New Radio (NR) deployment and maximize unlicensed access based on NR, an unlicensed band may work in frequency bands of 5 GHz, 37 GHz, and 60 GHz. Unlicensed bands can be used for a plurality of Radio Access Technologies (RATs), for example, Wireless Fidelity (Wi-Fi), radars, and Long Term Evolution Licensed-Assisted Access (LTE-LAA). Therefore, in some countries or regions, the use of unlicensed bands has to be subject to regulations to ensure fair use of the resources among all devices, for example, regulations such as Listen Before Talk (LBT) or a Maximum Channel Occupancy Time (MCOT). When a transmission node needs to send information, LBT needs to be performed for Energy Detection (ED) on the surrounding nodes. When detected energy is lower than a threshold, it is considered that a channel is idle, and the transmission node can perform sending. Otherwise, it is considered that the channel is busy, and the transmission node cannot perform sending. The transmission node may be a base station, User Equipment (UE), a Wi-Fi Access Point (AP), or the like. After transmission of the transmission node starts, a Channel Occupancy Time (COT) that the transmission takes cannot exceed an MCOT.
LBT can help with some problems of channel interference, but since LBT is performed by a transmitter node, LBT cannot help with the hidden node problem of a receiver node. As shown in
Embodiments of the present disclosure provide a transmission acknowledgment method, a terminal device, and a transmission node.
According to a first aspect, a transmission acknowledgment method is provided and applied to a first terminal. The method includes: monitoring a first physical control channel based on monitoring configuration information of the first physical control channel; obtaining first control information transmitted by a transmission node on the first physical control channel, where the first control information includes Request To Send (RTS) information for a plurality of target terminal devices, and the plurality of target terminal devices include the first terminal; and sending Confirm To Send (CTS) information on a second physical control channel based on the RTS information.
According to a second aspect, an information transmission method is provided and applied to a transmission node. The method includes:
transmitting first control information at a monitoring location of a first physical control channel, where the first control information includes RTS information for a plurality of target terminal devices;
receiving CTS information returned by at least one of the plurality of target terminal devices on a second physical control channel; and
scheduling a third physical control channel in a search space corresponding to the at least one of the plurality of target terminal devices for data transmission to the at least one target terminal device.
According to a third aspect, a terminal device is provided and includes a monitoring module, configured to monitor a first physical control channel based on monitoring configuration information of the first physical control channel; an obtaining module, configured to obtain first control information transmitted by a transmission node on the first physical control channel, where the first control information includes Request to Send RTS information for a plurality of target terminal devices, and the plurality of target terminal devices include the terminal device; and a sending module, configured to send Clear to Send CTS information on a second physical control channel based on the RTS information.
According to a fourth aspect, a transmission node is provided and includes: a transmission module, configured to transmit first control information at a monitoring location of a first physical control channel, where the first control information includes RTS information for a plurality of target terminal devices; a receiving module, configured to receive CTS information returned by at least one of the plurality of target terminal devices on a second physical control channel; and a scheduling module, configured to schedule a third physical control channel in a search space corresponding to the at least one of the plurality of target terminal devices for data transmission to the at least one target terminal device.
According to a fifth aspect, a terminal device is provided and includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the computer program is executed by the processor, steps of the method according to the first aspect are implemented.
According to a sixth aspect, a transmission node is provided and includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the computer program is executed by the processor, steps of the method according to the second aspect are implemented.
According to a seventh aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, steps of the method according to the first aspect or the second aspect are implemented.
The accompanying drawings described herein constitute a part of the present disclosure. The illustrative embodiments of the present disclosure and descriptions thereof are intended to describe the present disclosure, and do not constitute limitations on the present disclosure. In the accompanying drawings:
The following describes the technical solutions in embodiments of the present disclosure in conjunction with the accompanying drawings. Apparently, the described embodiments are some of rather than all embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.
The technical solutions of the present disclosure may be applied to various communications systems, such as a Global System of Mobile communication (GSM), a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a General Packet Radio Service (GPRS) system, a Long Term Evolution (LTE)/Long Term Evolution-advanced (LTE-A) system, and a New Radio (NR) system.
User Equipment (UE), also referred to as a terminal device, a mobile terminal, a mobile user device, or the like, may communicate with one or more core networks through a Radio Access Network (RAN). The user equipment may be a mobile terminal, for example, a mobile phone (also referred to as a “cell” phone) and a computer with a mobile terminal, for example, a portable, pocket-sized, handheld, computer built-in, or vehicle-mounted mobile apparatus that exchanges language and/or data with the radio access network.
A transmission node may be a Base Transceiver Station (BTS) in GSM or CDMA, a NodeB in WCDMA, an evolved NodeB (evolutional NodeB, eNB or e-NodeB) in LTE or a 5G gNodeB (gNB), or a terminal or Wi-Fi access point that transmits data to other terminals. This is not limited in the present disclosure. However, for ease of description, the gNB is used as an example in the following embodiments for description.
The technical solutions provided in the embodiments of the present disclosure are described in detail below in conjunction with the accompanying drawings.
S210: monitoring a first physical control channel based on monitoring configuration information of the first physical control channel.
In this embodiment of the present disclosure, the monitoring configuration information of the first physical control channel may be pre-configured, for example, may be configured by a network side through signaling, or may be agreed with the network side in advance.
S212: obtaining first control information transmitted by a transmission node on the first physical control channel, where the first control information includes RTS information for a plurality of target terminal devices, and the plurality of target terminal devices include the first terminal.
In this embodiment of the present disclosure, the first control information may include the RTS information from the transmission node for the plurality of target terminal devices, and the RTS information may indicate duration of a channel occupancy time on a shared frequency and identity information of the plurality of target terminal devices.
S214: sending CTS information on a second physical control channel based on the RTS information.
In this embodiment of the present disclosure, after obtaining the first control information, the first terminal is determined to be a target terminal device based on the RTS information in the first control information, and therefore sends the CTS information on the second physical control channel. The CTS information may indicate duration of a channel occupancy time.
According to the foregoing technical solution provided in this embodiment of the present disclosure, the first terminal monitors the first physical control channel, and obtains the first control information transmitted by the transmission node on the first physical control channel. The first control information includes the RTS information for the plurality of target terminal devices, and the terminal device sends the CTS information on the second physical control channel based on the RTS information to complete RTS/CTS handshaking, and can perform information transmission. Other devices that have not completed RTS/CTS handshaking, after receiving the CTS information, may learn, based on the duration of the channel occupancy time carried in the CTS information, that a shared spectrum is occupied within the duration of the channel occupancy time, so that the devices will not try transmitting. In this way, interference caused by hidden nodes surrounding the first terminal is avoided.
In this embodiment of the present disclosure, the first physical control channel may be in a format similar to that of a Physical Downlink Control CHannel (PDCCH) format. Therefore, in this embodiment of the present disclosure, the first physical control channel includes, but is not limited to, an RTS Group Common PDCCH (RTS-GC-PDCCH), an RTS Common PDCCH (RTS-C-PDCCH) specific for RTS transmission, and an RTS UE-Specific Physical Downlink Control CHannel (RTS-UE-Specific PDCCH). The RTS may be carried on the RTS-GC-PDCCH or the RTS-C-PDCCH specific for RTS transmission, or partially carried on the RTS-GC-PDCCH or the RTS-C-PDCCH and partially carried on the RTS-UE-specific PDCCH, and sent to a plurality of target UEs.
The second physical control channel may be in a format similar to that of a PUCCH format. The CTS may be carried on a CTS PUCCH specific for CTS transmission, an existing PUCCH, or a CTS PUCCH similar to a PUCCH format.
In some embodiments, the first control information may be in a pre-specified format, and may include at least one of the following: common indication domain and UE-specific indication domain. The UE-specific indication domain may be one or more. That is, in this embodiment, the RTS information for the plurality of target terminal devices is indicated by the common indication domain and/or the UE-specific indication domain in the first control information.
In the foregoing embodiment, for example, the common indication domain may include at least one of the following:
(1) first indication information used to indicate duration of a channel occupancy time, that is, duration of a time of occupying a channel in a shared band for current data transmission;
(2) second indication information used to indicate Quasi Co-Location (QCL), where the QCL is QCL used by the transmission node for obtaining a channel on a shared spectrum; and
(3) third indication information used to indicate a target terminal device that has a request for transmission, that is, indicate a target terminal device to which data needs to be transmitted.
In the foregoing embodiment, the third indication information may include one of the following: (1) a list of identity information of the target terminal devices, where the identity information of the target terminal devices includes Radio Network Temporary Identifier (RNTI) of the target terminal devices or identifiers of the target terminal devices configured in a terminal device group; and (2) a bitmap, where each bit in the bitmap is used to indicate whether one terminal device or one group of terminal devices is/are in the target terminal devices. For example, each bit in the bitmap is used to indicate whether one terminal device or one group of terminal devices in groups of terminal devices is/are in the target terminal devices. For example, one terminal device group includes 10 terminal devices. In this case, a bitmap of 10 bits may be used to separately indicate whether each terminal device is in the target terminal devices. Each bit corresponds to one terminal device. For example, when a value of the corresponding bit is 1, it is indicated that the terminal device is a target terminal device.
In the foregoing embodiment, each target terminal device may correspond to one UE-specific indication domain, and related information is indicated by using one UE-specific indication domain to a corresponding target terminal device.
In some embodiments, the UE-specific indication domain may include at least one of the following:
(1) resource indication information of the second physical control channel, where the resource indication information includes, but is not limited to, one of the following: time information and a PUCCH Resource Indicator (PRI) that are of the second physical control channel;
(2) monitoring indication information of a third physical control channel, where the third physical control channel is used to schedule data from the transmission node to the terminal devices, where the monitoring indication information includes, but is not limited to, time domain information and a search space identifier that are of the third physical control channel; and
(3) sending indication information of the second physical control channel. The sending indication information includes, but is not limited to, a format and spatial info that are of the second physical control channel.
In some embodiments, the common indication domain is carried on the RTS-GC-PDCCH or the RTS-C-PDCCH, and/or the UE-specific indication domain is carried on the RTS-UE-specific PDCCH. In some embodiments, both the common indication domain and the UE-specific indication domain are carried on the RTS-GC-PDCCH or the RTS-C-PDCCH.
In some embodiments, the network side may alternatively configure a start location of at least one field of each target terminal device. In this embodiment, after S110, the method further includes: obtaining RTS information corresponding to the first terminal from the first control information based on a first start location, where the first start location is a start location that is of the RTS information corresponding to the first terminal and that is in the first control information.
In the foregoing embodiment, the first start location may be a start location of at least one of the following RTS information:
(1) the first indication information used to indicate duration of a channel occupancy time;
(2) the second indication information used to indicate QCL, where the QCL is QCL used by the transmission node for obtaining a channel on a shared spectrum;
(3) fourth indication information used to indicate whether the first terminal needs to return the CTS;
(4) resource indication information of the second physical control channel, for example, resource indication information of a CTS-PUCCH or a CTS-PDCCH, including at least one of the following: a monitoring time, a PRI, time-frequency resources, and the like;
(5) monitoring indication information of the third physical control channel, for example, PDCCH monitoring indication information, including at least one of the following: a PDCCH monitoring time, a search space ID, and the like; and
(6) sending indication information of the second physical control channel, for example, sending indication information of the CTS-PUCCH or the CTS-PDCCH, including at least one of the following: a format, spatial information (spatial info), and the like that are of the second physical control channel.
In some embodiments, in S214, the CTS information corresponding to the RTS information is sent by the first terminal on the second physical control channel when at least one of the following is confirmed to be satisfied:
(1) that there is a request for transmission is determined based on the first control information, that is, the first terminal determines that the first terminal is one of the target terminal devices indicated by the RTS; and
(2) that there is no interference is determined.
In the foregoing embodiment, that there is no interference is determined includes at least one of the following:
(1) the first control information is decoded successfully, that is, verification of CRC of the first control information is passed;
(2) after one or more times of energy-detection-based channel sensing, a channel sensing result indicates that a channel is idle, that is, in a case in which the first terminal determines that the first terminal is one of the plurality of target terminal devices, the first terminal may perform one or more times of Energy-Detection-based Clear Channel Assessment (ED based CCA), and if the channel is idle, it is determined that there is no interference; and
(3) with interference estimation based on the first control information, that signal quality satisfies a pre-specified requirement is determined, where for example, an interference power or a Signal to Interference plus Noise Ratio (SINR) satisfies a specific condition.
In some embodiments, after S214, the method may further include: monitoring data scheduled by the third physical control channel, where the third physical control channel is used to schedule data from the transmission node to the first terminal.
In some embodiments, after S214, the method may further include: stopping monitoring the first physical control channel within a first time interval, where the first time interval is predefined, configured by the transmission node, or indicated by the first control information. To be specific, after receiving the RTS and sending the CTS on the second physical control channel, the first terminal stops monitoring the first physical control channel within the first time interval, where the first time interval may be the same as or different from the duration of the channel occupancy time indicated by the first control information, and may be specifically set based on actual applications.
In some embodiments, when the third physical control channel is monitored, monitoring the third physical control channel is stopped outside the duration of the channel occupancy time indicated by the first control information. In other words, in this embodiment, the first terminal can only monitor the third physical control channel within the duration of the channel occupancy time indicated by the first control information.
In the foregoing embodiment, a time domain monitoring location of the third physical control channel may be determined by using at least one of the following:
(1) an absolute time domain monitoring location of a configured target search space, where the target search space is a search space in which the third physical control channel is located;
(2) a relative time domain monitoring location of the configured target search space relative to the first physical control channel or the second physical control channel, where the target search space is a search space in which the third physical control channel is located; and
(3) a relative time domain monitoring location of the target search space, indicated by the first physical control channel, relative to the first physical control channel or the second physical control channel, where the target search space is a search space in which the third physical control channel is located. To be specific, in this embodiment, the network side may indicate, on the first physical control channel, a location of the target search space of the third physical control channel, where the location is a relative time domain monitoring location relative to the first physical control channel or the second physical control channel. In this embodiment, other than time domain configuration of the third physical control channel, other configuration of the third physical control channel may refer to configuration of a search space of an RTS-PDCCH or search space configuration indicated by the RTS-GC-PDCCH, the RTS-C-PDCCH, or the UE-specific PDCCH.
In this embodiment of the present disclosure, the third physical control channel may be in a format similar to that of a PDCCH. Therefore, in some embodiments, the third physical control channel may include a Scheduling PDCCH (S-PDCCH).
In some embodiments, the monitoring configuration information of the first physical control channel and/or the configuration information of the second physical control channel may be dynamically configured by the network side. Therefore, in this embodiment, before S210, the method may further include at least one of the following:
(1) receiving monitoring configuration information of the first physical control channel; and
(2) receiving configuration information of the second physical control channel.
In the foregoing embodiment, the monitoring configuration information of the first physical control channel includes, but is not limited to, at least one of the following:
(1) an RTS-specific RNTI, that is, an RNTI specific for RTS (RTS-RNTI);
(2) start locations of RTS information, in the first control information, of each target terminal device;
(3) a size of the first control information, that is, a size of the first control information transmitted on the RTS-GC-PDCCH, the C-PDCCH, or the UE-specific PDCCH;
(4) a target search space, where the target search space corresponds to a format of the first control information, UE may determine the format of the first control information based on the target search space, and, in some embodiments, the target search space corresponds to the format of the first control information that is for RTS transmission, where in some embodiments, the first control information may be in a same format as that of an existing Downlink Control Information (DCI), for example, DCI 0_0, DCI 0_1, DCI 1_0, or DCI 1_1, or may be in a newly defined DCI format specific for RTS transmission, that is, RTS DCI; and in this embodiment, the network side may indicate the format of the first control information through the target search space. For example, UE may agree with the network side in advance upon a format of the first control information corresponding to each search space. The network side indicates the target search space for transmitting the first physical control information when configuring the monitoring configuration information of the first physical control channel Through the target search space, the UE can determine the format of the first control information transmitted by the network side; and
(5) fifth indication information, where the fifth indication information is used to indicate whether the target search space is only used for transmission on the first physical control channel That is, the target search space may be only used for RTS-PDCCH transmission, or may also be used for other information, which may be specifically indicated by the network side.
In the foregoing embodiment, the configuration information of the second physical control channel may include the sending indication information of the second physical control channel, which may refer to the foregoing specific related descriptions. Details are not provided herein again.
In this embodiment of the present disclosure, the transmission node includes one of the following: a base station, a second terminal (for example, a relay terminal having the relaying capability), and a Wi-Fi access point.
The technical solution provided in this embodiment of the present disclosure can solve a problem of information exchange during channel access using a shared spectrum in NR, so that a transmission node and UE can complete RTS/CTS handshaking. A device that has not completed RTS/CTS handshaking will not try transmitting. In this way, interference during transmission by using the shared spectrum is reduced.
S310: transmitting first control information at a monitoring location of a first physical control channel, where the first control information includes RTS information for a plurality of target terminal devices.
In this embodiment of the present disclosure, when scheduling data requirements of one or more target terminals, the transmission node (for example, a base station) transmits, at the monitoring location of the first physical control channel of the target terminal, the first control information including the RTS information for the plurality of target terminal devices.
In this embodiment of the present disclosure, for related information, a format, and the like included in the first control information, refer to descriptions in the method 200. Details are not provided herein again.
In some embodiments, to ensure that a current shared spectrum is idle, before S310, the method may further include: performing LBT to determine whether a channel is idle. In a case in which the channel is determined to be idle, S310 is performed.
S312: receiving CTS information returned by at least one of the plurality of target terminal devices on a second physical control channel.
In this embodiment of the present disclosure, a target terminal device that receives the RTS information may return the CTS information to the transmission node on the second physical control channel. In some embodiments, the target terminal device may obtain the first control information transmitted on the first physical control channel in a manner described in the method 200, and return the CTS information to the transmission node based on the RTS information in the first control information, which may refer to specific related descriptions in the method 200. Details are not provided herein again.
In this embodiment of the present disclosure, the second physical control channel includes a CTS PUCCH or a CTS PDCCH.
In S312, the transmission node may determine a monitoring location on the second physical control channel based on a resource of the second physical control channel, so as to monitor, at the monitoring location, the CTS sent by the target terminal device.
In some embodiments, the resource of the second physical control channel may be predefined, that is, the resource of the second physical control channel is pre-specified in a communications system.
In some embodiments, the resource of the second physical control channel may be configured by the transmission node. For example, a base station may first send configuration information of the second physical control channel to the target terminal device, and then indicate the resource of the second physical control channel based on the configuration information.
In still another embodiment, the resource of the second physical control channel may alternatively be indicated to the target terminal device by using the first control information, so that the target terminal device can send the CTS at time-frequency locations corresponding to the resource.
S314: Scheduling a third physical control channel in a search space corresponding to the at least one of the plurality of target terminal devices for transmitting data to the at least one target terminal device.
In this embodiment of the present disclosure, the third physical control channel may include a scheduling PDCCH (that is, S-PDCCH).
In some embodiments, before S310, the method may further include at least one of the following:
(1) sending monitoring configuration information of the first physical control channel to the target terminal device; and
(2) sending configuration information of the second physical control channel to the target terminal device.
The monitoring configuration information of the first physical control channel and the configuration information of the second physical control channel are the same as those described in the method 200, and reference may be made to the specific descriptions in the method 200. Details are not provided herein again.
In this embodiment of the present disclosure, as described in the method 200, the first physical control channel includes at least one of the following: an RTS-GC-PDCCH, an RTS-C-PDCCH, and an RTS-UE-Specific PDCCH. Reference may be made to the specific related descriptions in the method 200. Details are not provided herein again.
According to the technical solution provided in this embodiment of the present disclosure, the transmission node can transmit the first control information including the RTS information for the plurality of target terminal devices at the monitoring location of the first physical control channel, receive the CTS information returned by one or more target terminals on the second physical control channel, and then schedule the third physical control channel in a search space corresponding to the one or more target terminal devices to transmit data to the target terminal device. Therefore, by the RTS/CTS handshaking mechanism, data transmission on the shared spectrum is completed. A device that has not completed RTS/CTS handshaking will not try transmitting. In this way, interference during transmission by using the shared spectrum is reduced.
S410: The base station sends first control information including RTS information to a plurality of target UEs on the first physical control channel.
For example, gNB may send the RTS to the plurality of UEs on an RTS-GC-PDCCH, an RTS-C-PDCCH, or a UE-specific PDCCH. The RTS may be entirely carried on the RTS-GC-PDCCH or the RTS-C-PDCCH, or partially carried on the RTS-GC-PDCCH or the RTS-C-PDCCH and partially carried on the RTS-UE-specific PDCCH.
S412: The target UEs monitor the first physical control channel to obtain the first control information transmitted on the first physical control channel.
This step is the same as S212 in the method 200. Reference may be made to the specific descriptions in the method 200.
S414: The target UEs send CTS information on a second physical control channel based on the RTS information in the first control information.
For example, the target UEs may transmit the CTS in a PUCCH.
This step is the same as S214 in the method 200. Reference may be made to the specific descriptions in S214 of the method 200.
In some embodiments, a channel occupancy time may be carried in the CTS sent by the UE. The channel occupancy time is equal to a channel occupancy time sent by the gNB minus a time for signal transmission, demodulation, and the like, that is, end locations of channel occupancy times in the RTS and the CTS are the same.
In some embodiments, UE information may be further carried in the CTS, so that the gNB can learn about the UE that sends the CTS, and therefore can perform, based on the received CTS, data scheduling for the UE that has sent the CTS.
S416: After receiving the CTS information sent by the target UEs, the base station schedules, on an S-PDCCH, data transmitted to the target UEs.
This step is the same as S314 in the method 300. Reference may be made to the specific descriptions in S314 of the method 300.
In this embodiment of the present disclosure, the RTS sent by the base station may at least include a channel occupancy time, that is, NAV or COT, and a time during which a channel needs to be occupied can be notified to surrounding nodes based on the information.
When the base station sends the RTS to the plurality of UEs on an RTS-PDCCH, all UE that receives the RTS-PDCCH may send the CTS to the gNB as a response. However, not all the UE that receives the RTS-PDCCH is scheduled every time. Therefore, UE that is not scheduled does not need to send the CTS. To prevent such unnecessary CTS transmission, in some embodiments, the UE information may be carried on the RTS-PDCCH, and the UE information indicates UE that needs to return the CTS. The UE that receives the RTS-PDCCH determines, based on the UE information carried on the RTS-PDCCH, whether to send the CTS. In some embodiments, if the UE information in the RTS-PDCCH includes information about UE, for example, a UE ID, or includes a C-RNTI, a group ID of the UE, or the like, the UE transmits the CTS to the gNB. When the RTS is sent to the plurality of UEs, the UE information may be a UE ID list, including IDs of all UE that needs to send the CTS, or may be a bitmap, where each bit corresponds to each UE in a group.
In some embodiments, in order to transmit the CTS on a PUCCH, the UE needs to learn about resource information of the PUCCH, and therefore, information about a format, information about a time domain location, and a PUCCH Resource Indicator (PRI) of the PUCCH may be carried in the RTS, that is, the RTS-PDCCH. Each UE corresponds to resource information of a group of PUCCHs. When the gNB sends the RTS to the plurality of UEs, resource information of a plurality of groups of PUCCHs may be carried in the RTS-PDCCH.
In some embodiments, if the UE transmits the CTS on a channel similar to the PDCCH, information about time-frequency resources allocated to the PDCCH used by the UE may further be carried in the RTS.
In some embodiments, spatial relation information (SpatialRelationinfo) about CTS transmission by the UE may further be carried in the RTS. For example, a reference resource ID (reference resource id, that may correspond to an index of a reference resource (reference resource)).
In some embodiments, information about S-PDCCH detection may further be carried on the RTS-PDCCH, and a corresponding monitoring location, a search space ID, and the like are notified to the UE.
In some embodiments, a time domain location of a PDCCH for sending the RTS may be pre-configured or predefined. The UE performs detection at a pre-configured monitoring location of the PDCCH. After detecting the RTS, the UE sends the CTS based on the information carried in the RTS. A time domain location of a PUCCH for sending the CTS may be as described in the method 200, and is carried in the RTS, or may be associated with the location of the PDCCH for sending the RTS and determined based on an offset configured through high-layer signaling. In addition, sending of the CTS may further depend on a channel status. UE may perform CCA before sending the CTS, and send the CTS when a channel is detected to be idle, otherwise the CTS is not sent.
In some embodiments, after receiving the RTS and/or sending the CTS, the UE starts detecting a PDCCH that schedules a PDSCH or a PUSCH. A detecting location of the scheduling PDCCH may be configured through high-layer signaling, or may be indicated by the RTS, or may be determined based on a offset relative to a location that is configured through high-layer signaling and that is of the PDCCH for sending the RTS or the PUCCH for sending the CTS.
The technical solution provided in this embodiment of the present disclosure can solve a problem of information exchange during channel access using a shared spectrum in NR, so that a base station and UE can complete handshaking, and transmission interference on the shared spectrum is reduced.
In some embodiments, the first control information includes at least one of the following: common indication domain and UE-specific indication domain.
In some embodiments, the common indication domain includes at least one of the following: first indication information used to indicate duration of a channel occupancy time; second indication information used to indicate Quasi-CoLocation (QCL), where the QCL is QCL used by the transmission node for obtaining a channel on a shared spectrum; and third indication information used to indicate a target terminal device that has a request for transmission.
In some embodiments, the third indication information includes one of the following: a list of identity information of the target terminal devices, where the identity information of the target terminal devices includes radio network temporary identifiers RNTI of the target terminal devices or identifiers of the target terminal devices configured in a terminal device group; and a bitmap, where each bit in the bitmap is used to indicate whether one terminal device or one group of terminal devices is/are in the target terminal devices.
In some embodiments, the UE-specific indication domain includes at least one of the following: resource indication information of the second physical control channel; monitoring indication information of a third physical control channel, where the third physical control channel is used to schedule data from the transmission node to the terminal device; and sending indication information of the second physical control channel.
In some embodiments, the first physical control channel includes at least one of the following: an RTS group common physical downlink control channel RTS-GC-PDCCH; an RTS common physical downlink control channel RTS-C-PDCCH; and an RTS UE-specific physical downlink control channel RTS-UE-Specific PDCCH.
In some embodiments, the common indication domain is carried on the RTS-GC-PDCCH or the RTS-C-PDCCH, and/or the UE-specific indication domain is carried on the RTS-UE-specific PDCCH.
In some embodiments, both the common indication domain and the UE-specific indication domain are carried on the RTS-GC-PDCCH or the RTS-C-PDCCH.
In some embodiments, the obtaining module 520 is further configured to: after the first control information transmitted on the first physical control channel is obtained, obtain RTS information corresponding to a first terminal from the first control information based on a first start location, where the first start location is a start location that is of the RTS information corresponding to the first terminal and that is in the first control information.
In some embodiments, the RTS information includes at least one of the following: first indication information used to indicate duration of a channel occupancy time; second indication information used to indicate quasi-colocation QCL, where the QCL is QCL used by the transmission node for obtaining a channel on a shared spectrum; and fourth indication information used to indicate whether the first terminal needs to return the CTS; resource indication information of the second physical control channel; monitoring indication information of a third physical control channel, where the third physical control channel is used to schedule data from the transmission node to the terminal device; and sending indication information of the second physical control channel.
In some embodiments, that the Clear To Send (CTS) information is sent on the second physical control channel based on the RTS information includes: the CTS information corresponding to the RTS information is sent on the second physical control channel when at least one of the following is confirmed to be satisfied: that there is a request for transmission is determined based on the first control information; and that there is no interference is determined.
In some embodiments, that there is no interference is determined includes at least one of the following: the first control information is decoded successfully; after one or more times of energy-detection-based channel sensing, a channel sensing result indicates that a channel is idle; and with interference estimation based on the first control information, that signal quality satisfies a pre-specified requirement is determined.
In some embodiments, the monitoring module 510 is further configured to: after the CTS information is sent on the second physical control channel, monitor data scheduled by the third physical control channel, where the third physical control channel is used to schedule data from the transmission node to the first terminal.
In some embodiments, the monitoring module 510 is further configured to: after the CTS information is sent on the second physical control channel, stop monitoring the first physical control channel within a first time interval, where the first time interval is predefined, configured by the transmission node, or indicated by the first control information.
In some embodiments, the monitoring module 510 is further configured to stop monitoring the third physical control channel outside the duration of the channel occupancy time indicated by the first control information.
In some embodiments, a time domain monitoring location of the third physical control channel is determined by using at least one of the following: an absolute time domain monitoring location of a configured target search space, where the target search space is a search space in which the third physical control channel is located; a relative time domain monitoring location of the configured target search space relative to the first physical control channel or the second physical control channel; and a relative time domain monitoring location of the target search space, indicated by the first physical control channel, relative to the first physical control channel or the second physical control channel.
In some embodiments, the third physical control channel includes a scheduling PDCCH.
In some embodiments, the second physical control channel includes a CTS PUCCH or a CTS PDCCH.
In some embodiments, the terminal further includes a receiving module, configured to receive, before the first physical control channel is monitored, at least one of the following: receiving monitoring configuration information of the first physical control channel; and receiving configuration information of the second physical control channel.
In some embodiments, the monitoring configuration information includes at least one of the following: an RTS-specific RNTI; start locations of RTS information, in the first control information, of each target terminal device; a size of the first control information; a target search space, where the target search space corresponds to a format of the first control information; and fifth indication information, where the fifth indication information is used to indicate whether the target search space is only used for transmission on the first physical control channel.
In some embodiments, the transmission node includes one of the following: a base station, a second terminal, and a Wi-Fi access point.
The terminal provided in this embodiment of the present disclosure can implement the processes implemented by the terminal device or the first terminal in the method embodiments in
In some embodiments, the transmission node further includes a determining module, configured to: before the first control information is transmitted, perform Listen Before Talk (LBT) to determine whether a channel is idle.
In some embodiments, a resource of the second physical control channel is predefined, or configured or indicated by the transmission node.
In some embodiments, the transmitting module 610 is further configured to: send, before the first control information is transmitted, at least one of the following: sending monitoring configuration information of the first physical control channel to the target terminal device; and sending configuration information of the second physical control channel to the target terminal device.
In some embodiments, the first physical control channel includes at least one of the following: an RTS-GC-PDCCH; an RTS-C-PDCCH; and an RTS-UE-Specific PDCCH.
In some embodiments, the second physical control channel includes at least one of the following: a CTS PUCCH or a CTS PDCCH.
The transmission node provided in this embodiment of the present disclosure can implement processes implemented by the transmission node or the base station in the method embodiments of
The user interface 703 may include a display, a keyboard, a clicking device (for example, a mouse, a trackball), a touch panel, a touchscreen, or the like.
It may be understood that the memory 702 in this embodiment of the present disclosure may be a volatile memory or a non-volatile memory, or may include both a volatile memory and a non-volatile memory. The non-volatile memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically EPROM (EEPROM), or a flash memory. The volatile memory may be a Random Access Memory (RAM), and is used as an external cache. By way of exemplary but not restrictive descriptions, there are many forms of available RAMs, such as a Static RAM (SRAM), a Dynamic RAM (DRAM), a Synchronous DRAM (SDRAM), a Double Data Rate SDRAM (DDRSDRAM), an Enhanced SDRAM (ESDRAM), a Synch Link DRAM (SLDRAM), and a Direct Rambus RAM (DRRAM). The memory 702 in the system and method described in the embodiments of the present disclosure is intended to include, but is not limited to, these and any other suitable type of memory.
In some embodiments, the memory 702 stores the following elements: an executable module or a data structure, or a subset thereof, or an extension set thereof: an operating system 7021 and an application program 7022.
The operating system 7021 includes various system programs, for example, a framework layer, a kernel library layer, and a driver layer, and is configured to implement various basic services and process a hardware-based task. The application program 7022 includes various application programs, for example, a media player and a browser, and is used to implement various application services. A program for implementing the method in this embodiment of the present disclosure may be included in the application program 7022.
In this embodiment of the present disclosure, the terminal device 700 further includes a computer program stored in the memory 702 and executable on the processor 701. When the computer program is executed by the processor 701, the following steps are implemented:
monitoring a first physical control channel based on monitoring configuration information of the first physical control channel;
obtaining first control information transmitted by a transmission node on the first physical control channel, where the first control information includes Request To Send (RTS) information for a plurality of target terminal devices, and the plurality of target terminal devices include the first terminal; and
sending Clear To Send (CTS) information on a second physical control channel based on the RTS information.
The methods disclosed in the foregoing embodiments of the present disclosure may be applied to the processor 701 or implemented by the processor 701. The processor 701 may be an integrated circuit chip having a signal processing capability. During implementation, each step of the foregoing methods may be completed by using an integrated logic circuit of hardware in the processor 701 or an instruction in a form of software. The processor 701 may be a general-purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or another programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. The methods, steps, and logical block diagrams disclosed in the embodiments of the present disclosure may be implemented or executed. The general-purpose processor may be a microprocessor, or the processor may be any conventional processor or the like. The steps of the methods disclosed with reference to the embodiments of the present disclosure may be directly performed by a hardware decoding processor, or may be performed by using a combination of hardware and software modules in a decoding processor. The software module may be located in a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable memory, a register, or another computer-readable storage medium that is mature in the art. The computer-readable storage medium is located in the memory 702, and the processor 701 reads information in the memory 702 and completes the steps in the foregoing methods in combination with hardware of the processor. In some embodiments, the computer-readable storage medium stores a computer program, and when the computer program is executed by the processor 701, steps of the method 300 are implemented.
It may be understood that the embodiments described in the embodiments of the present disclosure may be implemented by hardware, software, firmware, middleware, microcode, or a combination thereof. For implementation with hardware, a processing unit may be implemented in one or more Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a DSP Device (DSPD), a Programmable Logic Device (PLD), a Field-Programmable Gate Array (FPGA), a general-purpose processor, a controller, a microcontroller, a microprocessor, another electronic unit for implementing the functions in the present disclosure, or a combination thereof.
For software implementations, the techniques described in embodiments of the present disclosure may be implemented by modules (for example, processes or functions) that perform the functions described in the embodiments of the present disclosure. A software code may be stored in the memory and executed by the processor. The memory may be implemented in the processor or outside the processor.
The terminal device 700 can implement processes implemented by the terminal device or the first terminal in
Refer to
In this embodiment of the present disclosure, the transmission node 800 further includes a computer program stored in the memory 803 and executable on the processor 801. When the computer program is executed by the processor 801, the following steps are performed:
transmitting first control information at a monitoring location of a first physical control channel, where the first control information includes RTS information for a plurality of target terminal devices;
receiving CTS information returned by at least one of the plurality of target terminal devices on a second physical control channel; and
scheduling a third physical control channel in a search space corresponding to the at least one of the plurality of target terminal devices for transmitting data to the at least one target terminal device.
In
The processor 801 is responsible for managing the bus architecture and common processing, and the memory 803 may store data used when the processor 801 performs an operation.
The transmission node 800 can implement the processes implemented by the transmission node or the base station in
The embodiments of the present disclosure further provide a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, processes performed by the base station or the terminal device in the embodiments shown in
It should be noted that, in this specification, the terms “include”, “include”, or any other variant is intended to cover a non-exclusive inclusion, so that a process, a method, an article, or an apparatus that includes a list of elements not only includes those elements but also includes other elements which are not expressly listed, or further includes elements inherent to such process, method, article, or apparatus. An element limited by “include/include a . . . ” does not, without more constraints, preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.
Based on the descriptions of the foregoing implementations, those skilled in the art may clearly understand that the method in the foregoing embodiment may be implemented by software in addition to a necessary universal hardware platform or by hardware only. Based on such an understanding, the technical solutions of the present disclosure essentially or the part contributing to the prior art may be implemented in a form of a software product. The computer software product is stored in a storage medium (for example, a ROM/RAM, a hard disk, or an optical disc), and includes several instructions for instructing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, a network device, or the like) to perform the methods described in the embodiments of the present disclosure.
The embodiments of the present disclosure are described with reference to the accompanying drawings. However, the present disclosure is not limited to the foregoing specific implementations. The foregoing specific implementations are merely examples, but are not limiting. Those of ordinary skill in the art may make many forms without departing from the objective and the scope of the claims of the present disclosure, and these forms all fall within the protection scope of the present disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202010318706.8 | Apr 2020 | CN | national |
The application is a continuation of International Application No. PCT/CN2021/088170, filed on Apr. 19, 2021, which claims priority to Chinese Patent Application No. 202010318706.8, filed on Apr. 21, 2020. The entire contents of each of the above-identified applications are expressly incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/CN2021/088170 | Apr 2021 | US |
| Child | 17970550 | US |
