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WO2022063277A1 - Procédé et appareil de recherche de faisceau - Google Patents

Procédé et appareil de recherche de faisceau Download PDF

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Publication number
WO2022063277A1
WO2022063277A1 PCT/CN2021/120740 CN2021120740W WO2022063277A1 WO 2022063277 A1 WO2022063277 A1 WO 2022063277A1 CN 2021120740 W CN2021120740 W CN 2021120740W WO 2022063277 A1 WO2022063277 A1 WO 2022063277A1
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WIPO (PCT)
Prior art keywords
time
indication information
antenna panel
signal
channel
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Ceased
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PCT/CN2021/120740
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English (en)
Chinese (zh)
Inventor
李铁
类春阳
李伟华
郑旭
张永平
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication date
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Publication of WO2022063277A1 publication Critical patent/WO2022063277A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present application relates to the field of communication technologies, and in particular, to a beam search method and apparatus.
  • the future communication system such as the 5th generation (5G) system
  • 5G 5th generation
  • LTE Long Term Evolution
  • the low frequency frequency band is used, and the high frequency frequency band is added.
  • LTE Long Term Evolution
  • the introduction of high frequency can achieve larger bandwidth and higher transmission rate. Due to the high frequency, the signal will be severely fading during the spatial propagation process. Therefore, the future communication system will use beamforming technology to obtain good directional gain, so as to improve the directional power in the transmitting direction, improve the signal-to-interference noise ratio at the receiving end, and then Improve system performance.
  • the beam management framework includes beam training, beam measurement and reporting, individual signal or channel beam indication, etc.
  • the time for the terminal equipment to search for the beam according to the signal or channel beam indication is at the time of signal or channel transmission. In this way, for terminals with different capabilities, since beam search, beam preparation and switching all require time, these processing times will lead to Some signals or channels are not fully received, or cannot be received, resulting in performance degradation.
  • the present application provides a beam search method and device, which is beneficial to avoid problems such as incomplete or unreceivable reception caused by N beams not being processed properly at the time of signal or channel transmission.
  • the present application provides a beam search method.
  • the beam search method can be applied to a communication device, and the communication device can be a terminal or a network device, or a chip or a chip system on the terminal or network device.
  • the method includes: the communication device determines beam or antenna panel indication information, the The beam or antenna panel indication information is used to indicate the beam of the signal or channel transmitted at the transmission time N, and the initial search time of the beam is the transmission time N of the signal or channel; the communication device starts at time M to search for the beam or antenna It can be understood that the beam indicated by the panel indication information is not the beginning of the search beam at the transmission time N.
  • the time M is the time after the determination time of the beam or antenna panel indication information and before the transmission time N.
  • the communication device may determine the beam indication information to obtain the beam of the signal or channel transmitted at the transmission time N; or, the communication device may determine the antenna panel indication information to obtain the beam of the signal or channel transmitted at the transmission time N, and the beam indication information is hereinafter referred to as Examples illustrate alternative embodiments of the present application.
  • the terminal determines beam indication information, including: beam indication information.
  • the determination time of the beam indication information is the reception time of the beam indication information or the time interval L after that, where L is greater than zero and smaller than the time interval between the reception time and the transmission time N.
  • determining the beam indication information by the terminal includes: the communication device determines the transmission according to other signals or channels having a Quasi-Co-Location (QCL) relationship with the signal or channel transmitted at the transmission time N. Beam indication information of the signal or channel transmitted at time N.
  • the determination time of the beam indication information is the reception time of the beam indication information of other signals or channels or the time interval L after that, where L is greater than zero and less than the time interval between the reception time and the transmission time N.
  • the communication apparatus determining the beam indication information includes: the communication apparatus determines the beam indication information of the signal or channel transmitted at the transmission time N from the predefined or preconfigured beam indication information.
  • the determination moment of the beam indication information may be the moment before the transmission moment N.
  • the communication device can realize beam search in advance according to its own capabilities, which is beneficial to avoid the incomplete or unreceived reception caused by the incomplete or unreceived reception caused by the N beams at the time of transmission of the signal or channel, or the transmission caused by the transmission. Incomplete or unable to send, etc.
  • the communication device can search for beams in advance during the implementation process. Compared with the cost and complexity that the communication device needs to pay for searching for the beam at the transmission time N, the present application can reduce the cost of the communication device. These costs reduce the complexity of the communication device.
  • time M is the time after the beam pool update time and before time N; the beam indicated by the beam indication information is included in the beam pool activated after the beam pool update time.
  • the update time of the beam pool is related to the signal and channel, and the update time of the beam pool may be the reception time of the Media Access Control-Control Element (MAC-CE), or after the reception time of the MAC-CE.
  • the time of the interval length L or the time of receiving the radio resource control (Radio Resource Control, RRC) signaling, or the time of the interval length L after the time of receiving the RRC signaling.
  • the MAC-CE signaling is used to activate a beam subset in the configured beam resource pool; the RRC signaling is used to activate the configured beam resource pool.
  • L is greater than zero and less than the time interval between the corresponding reception moment and the transmission moment N.
  • this embodiment is beneficial to ensure that the N beams are ready at the time of transmission, and also avoids early beam search. For example, the beam #0 searched before the update time of the beam pool is different from the beam #0 searched after the update time of the beam pool, The resulting beam misalignment problem.
  • the beam indication information is included in downlink control information (Downlink Control Information, DCI), and the DCI is used to schedule the signal or channel to be transmitted at the transmission time N.
  • DCI Downlink Control Information
  • the beam indication information is included in Medium Access Control-Control Element (MAC-CE) signaling.
  • MAC-CE Medium Access Control-Control Element
  • the beam indication information is included in RRC signaling.
  • the beam indication information may be obtained according to beams of other signals or channels having a quasi-co-located QCL relationship with the signal or channel transmitted at the transmission time N.
  • the time M is predefined or derived based on a predefined rule.
  • the present application further provides a communication device.
  • the communication device may be a terminal or a network device, or a component in a terminal or a network device.
  • the communication apparatus may include various modules or units for performing the method in the first aspect and any possible implementation manner of the first aspect.
  • the functions of the modules or units may be implemented by hardware, or by executing corresponding software by hardware.
  • the structure of the communication device may include a processing unit, and the processing unit is configured to support the communication device to perform the corresponding functions in the above method.
  • the structure of the communication device may further include a communication unit, and the communication unit is used for supporting communication between the communication device and other devices.
  • the communication device may also include a storage unit for coupling with the processing unit and the communication unit, which stores program instructions and data necessary for the communication device.
  • the communication device includes:
  • the processing unit is used to determine the beam or antenna panel indication information, the beam or antenna panel indication information is used to indicate the beam of the signal or channel transmitted at the transmission time N, and the search start time of the beam is the transmission of the signal or the channel time N;
  • the processing unit is further configured to search for the beam or the beam indicated by the antenna panel indication information starting at time M; the time M is the time after the determination time of the beam indication information and before the transmission time N.
  • the communication device can realize beam search in advance, which is beneficial to avoid the incomplete or unreceived reception caused by the incomplete or unreceived reception caused by the N beams at the transmission time of the signal or channel, or the incomplete or unsendable transmission caused by the transmission. question.
  • the communication device further includes a communication unit, the communication unit is configured to receive a first channel or signal, the first channel or signal can be used to determine the beam or antenna panel indication information, and then the processing unit determines the beam or antenna panel indication.
  • the information may be specifically: the processing unit determines beam or antenna panel indication information according to the first channel or signal.
  • the first channel or signal includes the beam or antenna panel indication information to indicate the signal or channel transmitted at transmission time N. beam.
  • the communication unit may be a transceiver or a communication interface
  • the storage unit may be a memory
  • the processing unit may be a processor
  • the communication apparatus is a terminal or a network device.
  • the processing unit may be a processor; the communication unit may be a transceiver, or an input/output interface.
  • the communication device is a chip or a system of chips.
  • the processing unit may also be embodied as a processing circuit or a logic circuit; the communication unit may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuit, etc. on the chip or chip system.
  • the communication device includes:
  • the processor is used to determine beam or antenna panel indication information, the beam or antenna panel indication information is used to indicate the beam of the signal or channel transmitted at the transmission time N, and the search start time of the beam is the transmission of the signal or the channel time N;
  • the processor is further configured to search for the beam or the beam indicated by the antenna panel indication information starting at time M; the time M is the time after the determination time of the beam or the antenna panel indication information and before the transmission time N.
  • the communication device further includes a transceiver, and the transceiver is configured to receive a first channel or signal, and the first channel or signal can be used to determine beam or antenna panel indication information, and then the processor determines beam or antenna panel indication information. , which may be specifically: the processor determines beam or antenna panel indication information according to the first channel or signal.
  • the first channel or signal includes the beam or antenna panel indication information to indicate the signal or channel transmitted at transmission time N. beam.
  • the processor may be used to perform, for example but not limited to, baseband related processing
  • the transceiver may be used to perform, for example but not limited to, radio frequency transceiving.
  • the above-mentioned devices may be respectively arranged on chips that are independent of each other, or at least part or all of them may be arranged on the same chip.
  • processors can be further divided into analog baseband processors and digital baseband processors.
  • the analog baseband processor can be integrated with the transceiver on the same chip, and the digital baseband processor can be set on a separate chip. With the continuous development of integrated circuit technology, more and more devices can be integrated on the same chip.
  • a digital baseband processor can be integrated with a variety of application processors (such as but not limited to graphics processors, multimedia processors, etc.) on the same chip.
  • application processors such as but not limited to graphics processors, multimedia processors, etc.
  • Such a chip may be called a System on Chip. Whether each device is independently arranged on different chips or integrated on one or more chips often depends on the needs of product design. The embodiments of the present application do not limit the implementation form of the foregoing device.
  • the present application further provides a processor for executing the method described in the first aspect.
  • the process of sending the above information and receiving the above information in the above method can be understood as the process of outputting the above information by the processor, and the process of receiving the above input information by the processor .
  • the processor When outputting the above-mentioned information, the processor outputs the above-mentioned information to the transceiver for transmission by the transceiver. After the above-mentioned information is output by the processor, other processing may be required before reaching the transceiver.
  • the transceiver receives the above-mentioned information and inputs it into the processor. Furthermore, after the transceiver receives the above-mentioned information, the above-mentioned information may need to perform other processing before being input to the processor.
  • the above-mentioned processor may be a processor specially used to execute these methods, or may be a processor that executes computer instructions in a memory to execute these methods, such as a general-purpose processor.
  • the above-mentioned memory can be a non-transitory (non-transitory) memory, such as a read-only memory (Read Only Memory, ROM), which can be integrated with the processor on the same chip, or can be set on different chips respectively.
  • ROM read-only memory
  • the embodiment does not limit the type of the memory and the setting manner of the memory and the processor.
  • the present application provides a computer-readable storage medium for storing computer software instructions, and when the instructions are executed by a communication device, the method described in the first aspect above is implemented.
  • the present application further provides a computer program product comprising instructions which, when executed on a communication device, cause the communication device to perform the method described in the first aspect above.
  • the present application provides a chip system
  • the chip system includes a processor and a communication interface
  • the communication interface is used for inputting and/or outputting information
  • the information includes data, programs and/or instructions
  • the The processor is configured to invoke the program or instruction to implement or support the network device to implement the functions involved in the first aspect, for example, to determine or process at least one of the data and information involved in the above method.
  • the chip system further includes a memory for storing necessary program instructions and data of the network device.
  • the chip system may be composed of one or more chips, and may also include chips and other discrete devices.
  • FIG. 1 is a schematic diagram of a communication system provided by an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a downlink beam training process provided by an embodiment of the present application
  • FIG. 3 is a schematic diagram of an uplink beam training process provided by an embodiment of the present application.
  • FIG. 4 is a schematic flowchart of a beam search method provided by an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a current beam search method
  • FIG. 6 is a schematic diagram of a beam search method provided by an embodiment of the present application.
  • FIG. 7 is a schematic diagram of another beam search method provided by an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of another communication device provided by an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a chip provided by an embodiment of the present application.
  • the technical solutions of the present application can be applied to various communication systems.
  • global system for mobile communications LTE frequency division duplex system, LTE time division duplex system, universal mobile communication system, 4G system, and with the continuous development of communication technology
  • the technical solution of the present application can also be used for subsequent evolved communication systems , such as 5G systems, future communication systems, etc.
  • the embodiments of the present application can be applied to independent networking, that is, communication systems such as new base stations, backhaul links, and core networks deployed in future networks, and can also be applied to various communication systems such as non-independent networking.
  • the embodiments of the present application may be used in a fifth generation (5th generation, 5G) system, which may also be referred to as a new radio (new radio, NR) system, or a sixth generation (6th generation, 6G) system or other future communication systems ; or can also be used in device to device (device to device, D2D) systems, machine to machine (machine to machine, M2M) systems, long term evolution (long term evolution, LTE) systems and so on.
  • 5G fifth generation
  • NR new radio
  • 6G sixth generation
  • device to device device to device
  • M2M machine to machine
  • LTE long term evolution
  • the network device may be a device with a wireless transceiver function or a chip that can be provided in the device, and the network device includes but is not limited to: an evolved node B (evolved node B, eNB), a radio network controller ( radio network controller, RNC), node B (Node B, NB), network equipment controller (base station controller, BSC), network equipment transceiver station (base transceiver station, BTS), home network equipment (for example, home evolved Node B , or home Node B, HNB), baseband unit (BBU), access point (AP), wireless relay node, wireless backhaul node, wireless fidelity (wireless fidelity, WIFI) system Transmission point (transmission and reception point, TRP or transmission point, TP), etc.; it can also be a device used in 5G, 6G or even 7G systems, such as gNB in NR system, or transmission point (TRP or TP), in 5G system One or a group (including multiple antenna panels)
  • RNC radio network controller
  • terminal equipment may include, but is not limited to: user equipment (user equipment, UE), access terminal equipment, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal equipment, mobile equipment, User terminal equipment, user agent or user equipment, etc.
  • user equipment user equipment, UE
  • access terminal equipment subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal equipment, mobile equipment, User terminal equipment, user agent or user equipment, etc.
  • the terminal device may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, industrial control Wireless terminals in (industrial control), wireless terminals in self-driving, wireless terminals in remote medical, wireless terminals in smart grid, and transportation safety wireless terminals in smart cities, wireless terminals in smart homes, wireless terminals in the aforementioned V2X Internet of Vehicles, or RSUs of the wireless terminal type, etc.
  • a mobile phone mobile phone
  • a tablet computer Pad
  • a computer with a wireless transceiver function a virtual reality (VR) terminal device
  • AR augmented reality
  • industrial control Wireless terminals in (industrial control) wireless terminals in self-driving
  • wireless terminals in remote medical wireless terminals in smart grid
  • transportation safety wireless terminals in smart cities wireless terminals in smart homes, wireless terminals in the aforementioned V2X Internet of Vehicles, or RSUs of the wireless terminal type,
  • a gNB may include a centralized unit (CU) and a distributed unit (DU).
  • the gNB may also include an active antenna unit (AAU).
  • the CU implements some functions of the gNB, and the DU implements some functions of the gNB.
  • the CU is responsible for processing non-real-time protocols and services, and implementing functions of radio resource control (RRC) and packet data convergence protocol (PDCP) layers.
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • the DU is responsible for processing physical layer protocols and real-time services, and implementing the functions of the radio link control (RLC) layer, medium access control (MAC) layer, and physical (PHY) layer.
  • RLC radio link control
  • MAC medium access control
  • PHY physical
  • the higher-layer signaling such as the RRC layer signaling
  • the network device may be a device including one or more of a CU node, a DU node, and an AAU node.
  • the CU can be divided into network devices in an access network (radio access network, RAN), and the CU can also be divided into network devices in a core network (core network, CN), which is not limited in this application.
  • FIG. 1 is a schematic diagram of a communication system provided by an embodiment of the present application.
  • the communication system shown in FIG. 1 includes, but is not limited to, a base station and a terminal device, and may also include other communication devices, which will not be described in detail here.
  • 5G and future communication systems introduce high-frequency frequency bands (usually considered to be above 6G), such as 28GHz, 39GHz or 60GHz frequency bands, to meet the needs of larger bandwidth and higher transmission rates. Due to the high frequency, the signal will experience severe fading during space propagation. Therefore, 5G and future communication systems use beamforming (BF) technology to obtain good directional gain to improve the directional power in the transmitting direction and improve the signal-to-interference plus Noise Radio (SINR) at the receiving end. thereby improving system performance.
  • BF beamforming
  • the content of beam management includes beam training, beam measurement and reporting, and beam indication of each signal or channel.
  • beam training includes the scanning process of transmitting and receiving beams on both sides of the base station and the terminal, and the purpose is to find beam pairs, including a transmitting beam and a receiving beam. Therefore, the direction of the transmitting beam and the direction of the receiving beam are aligned, and the gain of the received signal is improved.
  • the beam training process includes a P-1 process, a P-2 process, and a P-3 process.
  • the P-1 process is coarse alignment, and the base station and the terminal obtain one or more suitable beam pairs through coarse beam scanning.
  • the P-2 process is to fine-tune the transmitting beam of the base station, and the terminal uses the initial receiving beam obtained by the P-1 process to train the fine transmitting beam of the base station.
  • the process of P-3 is to fine-tune the terminal's receiving beam, and the base station sends it fixedly based on the fine-transmission beam obtained by P-2, and trains the terminal's fine-receiving beam.
  • the beam training process includes U-1 process, U-2 process, and U-3 process. Among them, as shown in Fig. 3, the U-1 process is coarse alignment, and the base station and the terminal obtain one or more suitable beam pairs through coarse beam scanning.
  • the U-2 process is to fine-tune the receiving beam of the base station, and the terminal trains the fine receiving beam of the base station through the initial beam transmission obtained by the U-1 process.
  • the U-3 process is to fine-tune the transmitting beam of the terminal, and the base station transmits it fixedly based on the fine receiving beam obtained by U-2, and trains the fine transmitting beam of the terminal.
  • the beam pair for uplink transmission or the beam pair for downlink transmission obtained in the above beam training process may be implicitly represented by a Quasi Co-Location (QCL) relationship.
  • QCL Quasi Co-Location
  • There is a QCL relationship between two antenna ports which means that the channel large-scale parameters of one antenna port can be derived from the channel large-scale parameters obtained by the other antenna port.
  • the two antenna ports have a QCL relationship, then the large-scale characteristics of the channel that transmits a signal at one port can be inferred from the large-scale characteristics of the channel that transmits a signal at the other port, also referred to simply as having a QCL relationship between the two signals .
  • the parameters of one antenna port can be used to determine the parameters of another antenna port with a QCL relationship to that antenna port, or both antenna ports have the same parameters , or the parameter difference between the two antenna ports is less than a certain threshold.
  • the above beam training process can associate reference signals to form a TCI information table (Contains Transmission Configuration Indicator).
  • TCI information table contains Transmission Configuration Indicator.
  • the base station schedules the terminal to send data information (including: reference signal, control channel, data channel, etc.)
  • the base station will notify the terminal of the activated TCI state (TCI state) through downlink signaling, so that the terminal can infer which receiving beam to use for take over.
  • TCI state Transmission Configuration Indicator
  • the beam indication information is used to indicate the beam of the signal or the channel.
  • the indication information of the antenna panel can also be used to indicate the beam of the signal or the channel. The following embodiments and related implementation manners are described by taking beam indication information to indicate a beam of a signal or a channel as an example.
  • the uplink and downlink signals or channels can be indicated in an explicit manner or an implicit manner, and beam indication is performed through the QCL relationship.
  • Explicit mode means that signaling configures a beam to be used for a certain channel or signal
  • implicit mode is to predefine certain rules through constraints or protocols to specify the beam of a certain signal or channel.
  • the beam of the signal or channel is indicated in an explicit manner, for example, as shown in Table 1.
  • PDSCH Physical downlink share channel
  • RRC radio resource control
  • MAC-CE media access control-control element
  • DCI downlink control information
  • High-layer RRC signaling configures a beam resource pool, activates a beam subset containing multiple beams through MAC-CE signaling, and finally triggers a beam of the beam subset through DCI to indicate the PDSCH beam. For example, the PDSCH beam is notified to the terminal through the TCI state activated in the DCI.
  • PDCCH Physical downlink control channel
  • RRC+MAC-CE secondary signaling to determine beam indication information.
  • the upper layer RRC signaling configures a beam resource pool, and activates one of the beams through the MAC-CE signaling to indicate the PDCCH beam.
  • Channel state information-reference signal As shown in Table 1, for periodic CSI-RS, beams are configured through RRC; for semi-persistent CSI-RS, a beam resource pool is configured through RRC , MAC-CE signaling activates one of the beams; for aperiodic CSI-RS, configure a beam resource pool through RRC, MAC-CE can update the beam resource pool or activate one of the beam subsets, and trigger one of the beams through DCI , to indicate the beam of aperiodic CSI-RS.
  • Table 1 for periodic CSI-RS, beams are configured through RRC; for semi-persistent CSI-RS, a beam resource pool is configured through RRC , MAC-CE signaling activates one of the beams; for aperiodic CSI-RS, configure a beam resource pool through RRC, MAC-CE can update the beam resource pool or activate one of the beam subsets, and trigger one of the beams through DCI , to indicate the beam of aperiodic CSI-
  • Physical uplink control channel As shown in Table 1, a high-level RRC signaling is used to configure a beam resource pool, and one of the beams is activated through MAC-CE signaling to indicate the PUCCH beam.
  • Physical uplink shared channel As shown in Table 1, the beam of the PUSCH is indicated by the beam of the SRS indicated by the SRI associated with the PUSCH;
  • Sounding reference signal As shown in Table 1, for periodic SRS, the beam of SRS is configured through RRC; for semi-persistent SRS, a beam resource pool is configured through RRC, and MAC-CE indicates one of the beams as SRS For aperiodic SRS, configure a beam resource pool through RRC, MAC-CE can update the beam resource pool or activate one of the beam subsets, and indicate a beam as the beam of aperiodic SRS through DCI triggering.
  • SRS Sounding reference signal
  • Implicitly indicating the beam of a signal or channel for example:
  • PDSCH In a case, there is a QCL relationship between PDSCH and a synchronization signal block (Synchronization Signal block, SSB) that carries system information.
  • SSB Synchronization Signal block
  • the terminal before the terminal receives the beam resource pool initially configured by RRC, and before the MAC-CE activates one of the beam subsets, the terminal assumes that there is a QCL relationship between the PDSCH and the SSB used for initial access.
  • the types of the QCL relationship include Type A (Type-A) and Type D (Type-D).
  • the TCI field of the PDSCH in the DCI is not enabled, there is a QCL relationship between the PDSCH and the scheduled PDCCH, where the types of the QCL relationship include Type A (Type-A) and Type B (Type-B). ), Type C (Type-C), or Type D (Type-D).
  • the TCI field of the PDSCH in the DCI is not enabled, when the scheduling offset of the PDSCH is less than the scheduling threshold, the PDSCH has a QCL relationship with a PDCCH, and the PDCCH is the active part of the frequency band (band width part, BWP) of the serving cell.
  • the type of the QCL relationship is Type-A, Type-B, Type-C, or Type-D; if it is a multi-site scenario, the associated CORESET needs to be restricted to the same site.
  • the RRC configuration of the PDSCH includes at least one configuration with two TCI indications, when the scheduling offset of the current PDSCH is less than the scheduling threshold, the PDSCH uses the configuration with the smallest ID and two TCI indications. .
  • the QCL of the PDSCH is assumed to refer to the scheduled carrier, and the ID of the TCI activated by the PDSCH is the smallest. the TCI state.
  • the scheduling threshold refers to a scheduling duration, and the scheduling duration includes the DCI decoding and parsing duration and processing durations such as beam search, preparation, and handover.
  • PDCCH A case, for a normal PDCCH, there is a QCL relationship with the SSB that carries system information.
  • a CORESET other than ID#0 if no TCI-state is configured, or multiple TCI-states are configured in the initial RRC, and the MAC-CE is not activated, it has a QCL relationship with the initially accessed SSB.
  • HO cell handover
  • Scell secondary cell
  • the MAC-CE For the CORESET of ID #0, if no TCI-state is configured, or multiple TCI-states are configured in the initial RRC, and the MAC-CE is not activated, it has a QCL relationship with the initially accessed SSB.
  • CSI-RS No default beam is defined for periodic, semi-persistent CSI-RS. For aperiodic CSI-RS beams, if the scheduling offset is less than the scheduling threshold, if there are other channels or signals indicating the beam on the same symbol, the beams of other channels or signals are used, and if not, it has a QCL with a PDCCH relationship, the PDCCH is the PDCCH with the smallest CORESET ID on the slot with the nearest PDCCH monitoring where the serving cell activates the BWP.
  • the undefined default beam means that if the beam does not pass the explicit indication and the protocol does not specify the beam receiving behavior of the terminal, the terminal can determine the beam by itself.
  • PUCCH In one case, if the primary cell (pathloss reference signal, PL-RS) is not configured, the uplink beam is not configured, and the default beam is configured, the reference primary cell (PCell) activates BWP and the CORESET with the smallest ID beam.
  • the primary cell pathloss reference signal, PL-RS
  • PCell the reference primary cell
  • the beam refers to the carrier component (CC) to activate the beam of the PUCCH with the smallest CORESET ID dedicated to the BWP.
  • the beam refers to the CORESET beam with the smallest ID in the CC activated BWP.
  • the beam refers to the CC to activate the BWP with the smallest ID in the BWP. CORESET beam.
  • the beam indication information is used to indicate the beam of the signal or channel transmitted at the transmission time N, and the beam indication information can be indicated by one-level, two-level or three-level signaling as described above, or can also be indicated by an implicit method. Sure.
  • transmission time N and time M described herein may be absolute time or corresponding time units, for example, transmission time N corresponds to the start time of a time unit N, and time M corresponds to the start time of time unit M.
  • a time unit is, for example but not limited to, one or more radio frames, or one or more subframes, or one or more time slots, or one or more mini slots, or a or multiple sub slots, or one or more symbols, or a time window composed of multiple frames or subframes, such as a system information (system information, SI) window.
  • SI system information
  • the length of one symbol may be different for different subcarrier spacings.
  • the symbols include uplink symbols and downlink symbols, where the uplink symbols may be called single carrier-frequency division multiple access (SC-FDMA) symbols or orthogonal frequency division multiplexing (OFDM) symbols symbol; downlink symbols can be OFDM symbols.
  • SC-FDMA single carrier-frequency division multiple access
  • OFDM orthogonal frequency division multiplexing
  • the communication system divides each time unit in the time domain into at least one of an uplink time unit, a downlink time unit, or a special time unit based on the ratio of uplink and downlink time units.
  • the uplink time unit is the time unit in which the included time domain resources are used for uplink transmission.
  • the downlink time unit is a time unit in which the included time domain resources are used for downlink transmission.
  • the special time unit is a time unit including uplink and downlink conversion time domain resources.
  • a special time unit for example but not limited to, includes uplink and downlink conversion time domain resources and time domain resources for downlink transmission, or includes uplink and downlink conversion time domain resources and time domain resources for uplink transmission, or includes time domain resources for uplink and downlink conversion. domain resources, time domain resources for downlink transmission, time domain resources for uplink transmission, and so on.
  • Beam/antenna panel processing includes finding, preparing, and switching.
  • the beam search means that the terminal searches for the corresponding beam from the beam resource pool configured by the RRC or the beam subset activated by the MAC-CE according to the beam indication information.
  • Beam preparation means that the terminal powers on the radio frequency, performs software configuration, hardware configuration, and possible antenna panel switching according to the searched beam, also known as beam/panel activation.
  • Beam switching refers to configuring a phase locked loop (PLL) and other analog phase shift operations after beam preparation.
  • PLL phase locked loop
  • the beam processing time of the above signal or channel is the transmission time of the signal or channel. Search for the beam indicated by the beam indication information at the time N, and then perform beam preparation and beam switching, so as to receive the PDSCH at the time N.
  • the PDSCH since the PDSCH has been sent at time N, once the terminal is still ready to receive the beam, the PDSCH may be received incompletely or cannot be received, resulting in performance degradation.
  • the present application provides a beam search method, which can specify the start time of beam search, thereby avoiding the problem of incomplete or unreceived reception caused by unprocessed beams, thereby helping to ensure performance.
  • the beam search method according to the embodiment of the present application will be described below with reference to the communication system shown in FIG. 1 .
  • the beam search method can be applied to a terminal device or a chip or a chip system on the terminal device, and can also be applied to a network device or a chip or a chip system on the network device.
  • the execution body is similar and will not be repeated here.
  • FIG. 4 is a schematic flowchart of a beam search method provided by an embodiment of the present application. As shown in FIG. 4, the beam search method includes but is not limited to the following steps:
  • the terminal determines beam indication information
  • the beam indication information is used to indicate the beam of the signal or channel transmitted at the transmission time N.
  • the signal or channel transmitted at the transmission time N may be the above-mentioned PDSCH, PDCCH, PUCCH, PUSCH, CSI-RS, or SRS, or the like.
  • the beam can be a receive beam or a transmit beam.
  • the beam indication information may be indicated in an explicit manner.
  • the beam indication information is included in the DCI, and the DCI is used to schedule the signal or channel to be transmitted at the transmission time N. That is, the terminal receives the first signal or channel, and the first signal or channel may carry beam indication information, and further, the terminal may determine the beam indication information from the information carried by the first signal or channel.
  • the terminal can receive the PDCCH that schedules the PDSCH; further, the terminal can determine beam indication information from the information carried by the PDCCH, and the beam indication information is used to indicate the data of the PDSCH transmitted at transmission time N. beam.
  • the beam indication information is included in the medium access control-control element MAC-CE signaling.
  • the terminal can receive the MAC-CE signaling, and then the terminal can determine the beam indication information from the MAC-CE signaling.
  • the terminal can determine beam indication information from RRC configuration or DCI.
  • the beam indication information may be the TCI state of the TCI domain in the DCI, or may be an uplink spatial relationship.
  • the above-mentioned implicit mode indication may also be used.
  • the beam indication information is determined based on beams of other signals or channels. That is, the terminal can receive the first signal or channel; further, the terminal determines the beam indication information according to the beam of the first signal or channel. Wherein, there is a QCL relationship between the first signal or channel and the signal or channel transmitted at the transmission time N.
  • the terminal searches for the beam indicated by the beam indication information starting at time M; the time M is the time after the determination time of the beam indication information and before the transmission time N.
  • the beam indication information of various signals or channels transmitted at the transmission time N and the determination time of the beam indication information will be described below from Embodiment 1 and Embodiment 2.
  • Embodiment 1 the condition of the beam is indicated in an explicit manner.
  • the beam indication information is included in the DCI, and the DCI is used to schedule the signal or channel transmitted at the transmission time N; the determination time of the beam indication information is the successful decoding of the DCI The time when the beam indication information is obtained, or the receiving time of the DCI, or the time interval L after the receiving time of the DCI.
  • the beam indication information is included in the MAC-CE; the determination time of the beam indication information is the time when the beam indication information is successfully decoded from the MAC-CE, or The reception time of the MAC-CE or the time interval L after the reception time, L is greater than zero and less than the time interval between the reception time of the MAC-CE and the transmission time N.
  • the beam indication information is included in the RRC configuration, and the determination time of the beam indication information is the time when the beam indication information is successfully decoded from the RRC, or the reception time of the RRC or the interval after the reception time.
  • L is greater than zero and less than the time interval between the reception time of the RRC and the transmission time N.
  • the beam indication information is the beam of the SRS indicated by the SRI associated with the PUSCH, so the determination time of the beam indication information is the reception time of the SRI corresponding to the SRS associated with the PUSCH or the time interval L after that, L is greater than zero and Less than the time interval between the reception time and the transmission time N of the SRI.
  • the beam indication information is determined by the terminal based on a signal or channel having the above-mentioned QCL relationship with PDSCH; optionally, the determination moment of the beam indication information may be the moment when the terminal actually determines the beam indication information. Alternatively, the determination time of the beam indication information is the reception time of the signal or channel having the above-mentioned QCL relationship with the PDSCH.
  • the beam indication information is determined by the terminal based on a signal or channel having the above-mentioned QCL relationship with the PDCCH; optionally, the determination moment of the beam indication information may be the moment when the terminal actually determines the beam indication information. Alternatively, the determination time of the beam indication information is the reception time of the signal or channel having the above-mentioned QCL relationship with the PDCCH.
  • the beam indication information is determined by the terminal based on the PUCCH having the above-mentioned QCL relationship with the PUSCH.
  • the determination moment of the beam indication information may be the moment when the terminal actually determines the beam indication information.
  • the determination time of the beam indication information is the reception time of the scheduling information of the PUCCH.
  • the beam indicated by the beam indication information is the beam of the control resource set with the BWP activated by the primary cell and the smallest ID, and the determination moment of the beam indicator information is the determination moment of the beam.
  • FIG. 5 is a schematic diagram of a current beam search method.
  • the terminal receives DCI, which is used to schedule the terminal to receive the PDSCH at the transmission time N, and the beam indication information in it indicates that the terminal uses beam #2 to receive the PDSCH, and the PDSCH occupies 7
  • the symbol, protocol or standard stipulates that the start time of beam search is the transmission time N. Therefore, the terminal starts searching for the beam, preparing the beam and switching the beam at the transmission time N.
  • the beam processing time is 3 symbols, so that the data on the three symbols cannot be received, which in turn leads to the failure of PDSCH reception.
  • the demodulation reference signal in the PDSCH is in the three symbols, it may cause that channel estimation cannot be performed, and thus the PDSCH cannot be received.
  • FIG. 6 is a schematic diagram of a beam search method provided by an embodiment of the present application.
  • the terminal receives DCI, which is used to schedule the terminal to receive the PDSCH at the transmission time N, and the beam indication information in it indicates that the terminal uses beam #2 to receive the PDSCH, and the PDSCH occupies 7 symbol
  • the starting time M of the beam search can be a certain time between the receiving time of the DCI and the transmission time N, assuming that the starting time M of the beam search is shown in Figure 6, which is the time when the transmission time N is advanced by the length K . It can be seen that the terminal can search for the beam in advance at the time M, which is beneficial to prepare the receiving beam of the PDSCH at the transmission time N, thereby avoiding the problem that the PDSCH reception is incomplete or cannot be received.
  • time M is the time after the determination time of the beam indication information and before the transmission time N, and it can also be expressed as: the time M is the time corresponding to the advance time K of the transmission time N.
  • the duration K is greater than zero and not greater than the time interval between the determination moment of the beam indication information and the transmission moment N.
  • the units of time, time interval, and duration described herein are time units, seconds, or microseconds, and the like.
  • time M or transmission time N may correspond to the start time of symbol 0 in time slot 0 in frame n; duration K may correspond to one or more symbols, time slots, or mini-slots.
  • time M is the time after the beam pool update time and before time N.
  • the beam indicated by the beam indication information is included in the beam pool activated (or valid or updated) after the beam pool update time.
  • the beam pool may be a beam resource pool configured by RRC, or may be a subset of beams activated by MAC-CE. Specifically, it is related to the signal or channel transmitted at the transmission time N.
  • the beam pool update time is the time when the terminal receives the MAC-CE or the time interval L after that, where L is greater than zero and less than the time interval between the reception time of the MAC-CE and the transmission time N,
  • the MAC-CE is used to activate a beam subset in the beam resource pool configured by the RRC.
  • the beam pool update time is the time when the terminal receives the MAC-CE signaling or the time interval L after that, where L is greater than zero and less than the time between the reception time of the MAC-CE and the transmission time N
  • the MAC-CE signaling is used to activate a beam subset in the beam resource pool configured by the RRC.
  • the beam pool update time is the time when the terminal receives the RRC signaling or the time interval L after that. L is greater than zero and less than the time interval between the reception time of the RRC and the transmission time N.
  • the RRC signaling The beam resource pool used to activate the configuration.
  • the beam pool update time is the time when the terminal receives the MAC-CE signaling or the time interval L after that, where L is greater than zero and less than the time between the reception time of the MAC-CE and the transmission time N interval, the MAC-CE signaling is used to activate a beam subset in the beam resource pool configured by the RRC.
  • the beam pool update time of these signals or channels can be determined according to the beam pool update time of other signals or channels having a QCL relationship with these signals or channels.
  • the update time of the beam pool of PDSCH is the update time of the beam pool of PDCCH having a QCL relationship with PDSCH.
  • the beam pool update time of the PDCCH is the reception time of the RRC signaling configuring the beam resource pool or the time interval L after that, where L is greater than zero and less than the time interval between the reception time of the RRC and the transmission time N.
  • time M or the duration K described herein may be predefined, or derived based on a predetermined rule.
  • the terminal can The beam is processed in advance at time M or time K in advance, such as searching, preparation and/or switching, etc., so as to use the processed beam to receive signals or channels in time at transmission time N, and ensure transmission performance.
  • this application can also provide a partial frequency band (BWP) handover or CC handover, etc.
  • BWP partial frequency band
  • the terminal can prepare part of the frequency band or CC in advance, so as to avoid transmission caused by untimely handover. performance-impaired issues.
  • the methods provided by the embodiments of the present application are introduced from the terminal device, and the network device refers to the terminal device for the application of the methods provided by the embodiments of the present application.
  • the network device or the terminal device may include a hardware structure and/or a software module, and implement the above functions in the form of a hardware structure, a software module, or a hardware structure plus a software module . Whether one of the above functions is performed in the form of a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraints of the technical solution.
  • FIG. 8 is a schematic block diagram of a communication apparatus 800 provided by an embodiment of the present application.
  • the communication apparatus 800 corresponds to the network device or terminal in the above beam search method.
  • the communication apparatus 800 may include but is not limited to:
  • the processing unit 802 is configured to determine beam indication information, where the beam indication information is used to indicate the beam of the signal or channel transmitted at the transmission time N, and the search start time of the beam is the transmission time of the signal or the channel N;
  • the processing unit 802 is further configured to search for the beam indicated by the beam indication information starting from time M; the time M is the time after the determination time of the beam indication information and before the transmission time N.
  • the first channel or signal includes the beam or antenna panel indication information to indicate the signal or channel transmitted at transmission time N. beam.
  • the processing unit 802 may determine the beam or antenna panel indication information according to the QCL relationship between the first signal or channel and the channel or signal transmitted at the transmission time N; or, the processing unit 802 may obtain information carried by the first signal or channel from the information carried by the first signal or channel. , determine the beam or antenna panel indication.
  • the communication device 800 can start to search for the beam before the transmission time N, which is beneficial to ensure that the beam processing is completed at the transmission time N, and the signal or channel is received or sent in time to avoid incomplete reception or transmission, and Unable to receive, unable to send, etc.
  • time M is the time after the beam pool update time and before the transmission time N; the beam indicated by the beam indication information is included in the beam pool activated after the beam pool update time. In this way, it is beneficial to process the beams in time and at the same time ensure that the searched beams are aligned with the beams in the newly activated beam subset of the network device.
  • FIG. 9 is a schematic structural diagram of a communication device.
  • the communication apparatus 900 may be a network device, a terminal device, a chip, a chip system, or a processor that supports the network device to implement the above method, or a chip or a chip system that supports the terminal device to implement the above method. , or processor, etc.
  • the device can be used to implement the methods described in the above method embodiments, and for details, refer to the descriptions in the above method embodiments.
  • the communication apparatus 900 may include one or more processors 901 .
  • the processor 901 may be a general-purpose processor or a special-purpose processor, or the like.
  • it may be a baseband processor or a central processing unit.
  • the baseband processor can be used to process communication protocols and communication data
  • the central processing unit can be used to control communication devices (such as base stations, baseband chips, terminals, terminal chips, DU or CU, etc.), execute software programs, process software program data.
  • the communication apparatus 900 may include one or more memories 902, and instructions 904 may be stored thereon, and the instructions may be executed on the processor 901, so that the communication apparatus 900 executes the above method methods described in the examples.
  • the memory 902 may also store data.
  • the processor 901 and the memory 902 can be provided separately or integrated together.
  • the communication apparatus 900 may further include a transceiver 905 and an antenna 906 .
  • the transceiver 905 may be referred to as a transceiver unit, a transceiver, or a transceiver circuit, etc., for implementing a transceiver function.
  • the transceiver 905 may include a receiver and a transmitter, the receiver may be called a receiver or a receiving circuit, etc., for implementing a receiving function; the transmitter may be called a transmitter or a transmitting circuit, etc., for implementing a transmitting function.
  • the processor 901 is configured to execute S101 to S102 in the beam search method 100.
  • the first channel or signal includes the beam or antenna panel indication information to indicate the signal or channel transmitted at transmission time N. beam.
  • the processor 901 may determine the beam or antenna panel indication information according to the QCL relationship between the first signal or channel and the channel or signal transmitted at the transmission time N; alternatively, the processor 901 may obtain information carried by the first signal or channel from the information carried by the first signal or channel. , determine the beam or antenna panel indication.
  • the processor 901 may include a transceiver for implementing the functions of receiving and transmitting.
  • the transceiver may be a transceiver circuit, or an interface, or an interface circuit.
  • Transceiver circuits, interfaces or interface circuits used to implement receiving and transmitting functions may be separate or integrated.
  • the above-mentioned transceiver circuit, interface or interface circuit can be used for reading and writing code/data, or the above-mentioned transceiver circuit, interface or interface circuit can be used for signal transmission or transmission.
  • the processor 901 may store an instruction 903, and the instruction 903 runs on the processor 901, so that the communication apparatus 900 can execute the method described in the foregoing method embodiment.
  • the instructions 903 may be hardened in the processor 901, in which case the processor 901 may be implemented by hardware.
  • the communication apparatus 900 may include a circuit, and the circuit may implement the function of sending or receiving or communicating in the foregoing method embodiments.
  • the processors and transceivers described in the embodiments of the present application can be implemented in integrated circuits (ICs), analog ICs, radio frequency integrated circuits (RFICs), mixed-signal ICs, application specific integrated circuits (ASICs), printed circuits board (printed circuit board, PCB), electronic equipment, etc.
  • the communication device described in the above embodiments may be a network device or a terminal device, but the scope of the communication device described in the embodiments of the present application is not limited to this, and the structure of the communication device may not be limited by FIG. 9 .
  • the communication apparatus may be a stand-alone device or may be part of a larger device.
  • the communication means may be:
  • a set with one or more ICs may also include a storage component for storing data and instructions;
  • the communication device may be a chip or a chip system
  • the chip 1000 shown in FIG. 10 includes a processor 1001 and an interface 1002 .
  • the number of processors 1001 may be one or more, and the number of interfaces 1002 may be multiple.
  • the interface 1002 is configured to determine beam indication information, where the beam indication information is used to indicate a beam of a signal or a channel transmitted at a transmission time N, and the search start time of the beam is the transmission of the signal or the channel time N;
  • determining the beam indication information by the interface 1002 may include: receiving the beam indication information by the interface 1002 .
  • the interface 1002 determines the beam indication information, which may include: the interface 1002 receives other signals or channels that have a QCL relationship with the signal or channel, and then the processor 1001 determines the beam of the signal or channel transmitted at the transmission time N according to the beam of the other signal or channel Instructions.
  • the chip further includes a memory 1003, where the memory 1003 is used to store necessary program instructions and data of the terminal device or the network device.
  • the present application also provides a computer-readable medium on which a computer program is stored, and when the computer program is executed by a computer, implements the functions of any of the foregoing method embodiments.
  • the present application also provides a computer program product, which implements the functions of any of the above method embodiments when the computer program product is executed by a computer.
  • the above-mentioned embodiments it may be implemented in whole or in part by software, hardware, firmware or any combination thereof.
  • software it can be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated.
  • the computer may be a general purpose computer, special purpose computer, computer network, or other programmable device.
  • the computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server, or data center Transmission to another website site, computer, server, or data center by wire (eg, coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.).
  • the computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, a data center, or the like that includes an integration of one or more available media.
  • the available media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, high-density digital video discs (DVDs)), or semiconductor media (eg, solid state disks, SSD)) etc.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un appareil de recherche de faisceau. Dans le procédé, après avoir déterminé un faisceau ou des informations d'indication de panneau d'antenne, un terminal peut utiliser le moment M comme début de recherche d'un faisceau indiqué par des informations d'indication de faisceau, au lieu d'utiliser le moment de transmission N d'un signal ou d'un canal comme moment de recherche de départ du faisceau. Le moment M est un moment après un moment de détermination du faisceau ou des informations d'indication de panneau d'antenne et avant le moment de transmission N. Ainsi, dans la présente demande, un terminal peut mettre en œuvre une recherche de faisceau à l'avance, ce qui aide à éviter des problèmes tels qu'une réception incomplète ou une défaillance de réception, qui est provoquée par un faisceau qui n'est pas bien traité au moment de transmission N d'un signal ou d'un canal.
PCT/CN2021/120740 2020-09-27 2021-09-26 Procédé et appareil de recherche de faisceau Ceased WO2022063277A1 (fr)

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US20230156636A1 (en) * 2021-11-17 2023-05-18 Qualcomm Incorporated Pdsch rate-matching in ntn

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CN105207708A (zh) * 2015-09-06 2015-12-30 北京北方烽火科技有限公司 一种波束赋形权向量的生成方法及装置
CN109392153A (zh) * 2017-08-11 2019-02-26 北京展讯高科通信技术有限公司 用户设备及其获取波束信息的方法、计算机可读介质
CN109391337A (zh) * 2017-08-11 2019-02-26 华为技术有限公司 一种同步方法、上报方法以及对应装置

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CN105207708A (zh) * 2015-09-06 2015-12-30 北京北方烽火科技有限公司 一种波束赋形权向量的生成方法及装置
CN109392153A (zh) * 2017-08-11 2019-02-26 北京展讯高科通信技术有限公司 用户设备及其获取波束信息的方法、计算机可读介质
CN109391337A (zh) * 2017-08-11 2019-02-26 华为技术有限公司 一种同步方法、上报方法以及对应装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230156636A1 (en) * 2021-11-17 2023-05-18 Qualcomm Incorporated Pdsch rate-matching in ntn
US12069597B2 (en) * 2021-11-17 2024-08-20 Qualcomm Incorporated PDSCH rate-matching in NTN

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