CN108347274B - Method and device for indicating number of feedback beams - Google Patents

Method and device for indicating number of feedback beams Download PDF

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Publication number
CN108347274B
CN108347274B CN201710061377.1A CN201710061377A CN108347274B CN 108347274 B CN108347274 B CN 108347274B CN 201710061377 A CN201710061377 A CN 201710061377A CN 108347274 B CN108347274 B CN 108347274B
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beams
available
terminal equipment
network equipment
information
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CN108347274A (en
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张希
向高
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side

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

Abstract

The invention provides a method and a device for indicating the number of feedback beams, wherein the method comprises the following steps: the terminal equipment receives the maximum beam number N which is issued by the network equipment and allows the terminal equipment to feed back; measuring beams according to downlink measurement signals issued by the network equipment, and determining the number M of available beams; and feeding back beam information to the network equipment according to the maximum beam number N and the available beam number M. The method is convenient for the terminal equipment to flexibly feed back the beam information, and further, is convenient for the network equipment to realize flexible scheduling, and saves resources.

Description

Method and device for indicating number of feedback beams
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for indicating a number of feedback beams.
Background
In the 5G communication system, a carrier frequency (generally, greater than 6GHz or more) higher than that of Long Term Evolution (LTE) is adopted, such as a frequency band of 28GHz, 38GHz, or 72GHz, to implement wireless communication with a larger bandwidth and a higher transmission rate. Due to the higher carrier frequency, the transmitted wireless signal experiences more severe fading during the spatial propagation process, and even the wireless signal is difficult to detect at the receiving end. Therefore, in the 5G communication system, a Beamforming (BF) technique is used to obtain a beam with good directivity, so as to increase power in the transmission direction and improve the Signal to Interference plus Noise Ratio (SINR) at the receiving end. In order to increase coverage and control antenna array cost, Hybrid Beamforming (HBF) technology is the best choice, which includes both Analog Beamforming (ABF) and Digital Beamforming (DBF). The DBF is similar to the multiple-Input multiple-Output (MIMO) in LTE, and the ABF adjusts the pointing direction of the analog beam by changing the weights among the array elements in the antenna array.
In order to further improve the communication quality, the terminal device also uses beamforming technology to generate analog beams in different directions for receiving and transmitting data. Since network devices such as a Transmission Reception Point (TRP) and a terminal device communicate using a narrow analog beam, better communication quality is obtained only when analog beams for Transmission and reception are aligned. Therefore, in a 3GPP RAN1 conference, it has been determined that a Beam scanning (Beam scanning) procedure is used to determine a Beam pair (a transmission Beam and a reception Beam) between a TRP and a terminal in a New Radio (NR) of 5G, as shown in fig. 1, and a plurality of Beam pairs are monitored in a communication procedure to improve the robustness of a communication link. In addition, to increase Cell (Cell) coverage, one Cell of a 5G NR may contain multiple TRPs, each of which may transmit multiple different analog beams.
The terminal device measures the beam quality through a downlink measurement Signal sent by the network device, such as a BRS (beam Reference Signal), a CSI-RS (Channel State Information Reference Signal), for example, the RSRP (Reference Signal received power) of each beam, the RSRQ (Reference Signal received quality), the CSI (Channel State Information ) of each beam is measured, and then the best N pieces of beam Information are reported to the network device. The value of N is configured by the base station in V5G (Verizon 5G), and may be selected to be 1, 2 or 4.
On one hand, when a larger value of N is set and the terminal device does not detect a sufficient number of beams meeting the quality, if the terminal device still reports the beam information of the N beams, resource waste is caused; on the other hand, when a smaller N value is set, the terminal device may detect more than N number of available beams, and if N beams are still reported, it is not favorable for the base station to adopt a more flexible scheduling and a more efficient transmission mode, thereby affecting the throughput rate of the terminal device. In 5G NR, the concept of beam groups has been introduced, and the best N beams may be fed back for each beam group, which may make the above problem even more serious.
Disclosure of Invention
The invention provides a method and a device for indicating the number of feedback beams, so that terminal equipment can flexibly feed back beam information.
In one aspect, a method for indicating the number of feedback beams is provided, including:
the network equipment informs the terminal equipment of the maximum beam number N allowed to be fed back by the terminal equipment;
the network equipment issues a downlink measurement signal; so as to measure the wave beam with the terminal equipment according to the downlink measurement signal and determine the number M of the available wave beams;
and receiving beam information fed back by the terminal equipment, wherein the number of the fed-back beams is determined by the terminal equipment according to the maximum beam number N and the available beam number M.
With reference to the above aspect, before receiving the beam information fed back by the terminal device, the method further includes:
and the network equipment informs the terminal equipment of the indication information of whether the terminal equipment is allowed to select the feedback beam number.
In another aspect, a method for indicating the number of feedback beams is provided, including:
the terminal equipment receives the maximum beam number N which is issued by the network equipment and allows the terminal equipment to feed back;
measuring beams according to downlink measurement signals issued by the network equipment, and determining the number M of available beams;
and feeding back beam information to the network equipment according to the maximum beam number N and the available beam number M.
In the above scheme, the number of beams to be fed back is determined according to the maximum number of beams N and the number of available beams M, and then the number of beams information is fed back.
The above two aspects belong to the same scheme, and are described from the perspective of network equipment and terminal equipment, respectively.
The maximum number of beams N may be transmitted by a CSI-RS reporting configuration (channel state-reference signal reporting settings), may be transmitted by RRC (Radio resource control) signaling, or may be transmitted by other signaling.
In another scheme, the maximum number of beams N may be preset, and the network device does not need to notify the terminal device.
With reference to the above aspects, wherein the feeding back the beam information to the network device according to the maximum beam number N and the available beam number M includes at least one of:
if the number M of available beams is less than or equal to the maximum number N of beams, feeding back beam information of the M beams to the network equipment;
and if the number M of the available beams is larger than the maximum number N of the beams, feeding back the beam information of the optimal N beams in the M beams to the network equipment.
With reference to the foregoing aspects, wherein before feeding back beam information to the network device according to the maximum beam number N and the available beam number M, the method further includes:
and receiving indication information which is sent by the network equipment and used for allowing the terminal equipment to select the number of the feedback beams.
The indication information may be notified by the network device through L1/L2/L3 signaling, for example, through DCI (downlink Control information), MAC CE (Media Access Control element), or RRC, or through other methods.
If the indication information indicates that the terminal equipment is allowed to select autonomously, the terminal equipment feeds back beam information to the network equipment according to the maximum beam number N and the available beam number M; and if the indication information indicates that the terminal equipment is not allowed to autonomously select, the terminal equipment adopts the maximum beam quantity N to feed back the beam information or adopts a system default value to feed back the beam information.
To the method of the first aspect, a network device is also disclosed, which includes:
a sending module: the terminal equipment is informed of the maximum beam number N allowed to be fed back by the terminal equipment; sending down measuring signals so as to measure beams with the terminal equipment according to the down measuring signals and determine the number M of available beams;
a receiving module: and the terminal equipment is used for receiving the beam information fed back by the terminal equipment, wherein the number of the feedback beams is determined by the terminal equipment according to the maximum beam number N and the available beam number M.
Wherein the sending module is further configured to: and informing the terminal equipment of the indication information of whether the terminal equipment is allowed to select the feedback beam number.
To the method of the first aspect, a terminal device is also disclosed, which includes:
a receiving module: the maximum beam number N is used for receiving the maximum beam number N which is issued by the network equipment and allows the terminal equipment to feed back;
a processing module: the device is used for measuring wave beams according to the downlink measuring signals sent by the network equipment and determining the number M of available wave beams;
a sending module: and the device is used for feeding back beam information to the network equipment according to the maximum beam number N and the available beam number M.
The sending module is used for realizing at least one of the following functions:
if the number M of available beams is less than or equal to the maximum number N of beams, feeding back beam information of the M beams to the network equipment;
and if the number M of the available beams is larger than the maximum number N of the beams, feeding back the beam information of the optimal N beams in the M beams to the network equipment.
The receiving module is further configured to receive indication information, which is sent by a network device, whether the terminal device is allowed to select the number of feedback beams.
In the network device and the terminal device, the sending module may be implemented by a transmitter, the receiving module is implemented by a receiver, and the processing module is implemented by at least one processor.
In the above scheme, the terminal device can autonomously select the number of the fed-back beams, so that the terminal device can flexibly feed back the beam information.
In a second aspect, a method for indicating the number of feedback beams is provided, including:
the network equipment informs the terminal equipment of the set of the number of the beams allowed to be fed back by the terminal equipment;
the network equipment sends down the measurement signal, so that the terminal equipment can measure the wave beam according to the down measurement signal and determine the number of the available wave beam;
and receiving beam information fed back by the terminal equipment, wherein the number of feedback beams is the number of beams selected from the set of the number of beams by the terminal equipment according to the available number of beams.
In another aspect, a method for indicating the number of feedback beams is provided, including:
the terminal equipment receives a set which is issued by the network equipment and allows the number of beams fed back by the terminal equipment;
measuring beams according to downlink measurement signals issued by the network equipment, and determining the number of available beams;
and selecting one beam number from the set of beam numbers according to the available beam number, and feeding back the information of the selected beam number to the network equipment.
The above two aspects belong to the same scheme, and are described from the perspective of network equipment and terminal equipment, respectively.
The above-mentioned set of the number of beams may be transmitted by CSI-RS report configuration, RRC signaling, or other signaling.
In another scheme, the set of the number of beams may be preset, and the network device is not required to notify the terminal device.
In combination with the above, wherein the selected number of beams is less than the available number of beams, or closest to the available number of beams, or less than and closest to the available number of beams.
To the method of the second aspect, a network device is also disclosed, which includes:
a sending module: the terminal equipment is informed of the set of the beam number allowed to be fed back by the terminal equipment; sending down measuring signals so that the terminal equipment can measure wave beams according to the down measuring signals and determine the number of available wave beams;
a receiving module: and the terminal equipment is used for receiving beam information fed back by the terminal equipment, wherein the number of beams is the number of beams selected from the set of the number of beams by the terminal equipment according to the available number of beams.
To the method of the second aspect, a terminal device is also disclosed, which includes:
a receiving module: the device comprises a receiving unit, a feedback unit and a feedback unit, wherein the receiving unit is used for receiving a set of beam numbers which are issued by network equipment and allow the terminal equipment to feed back;
a processing module: the device is used for measuring wave beams according to the downlink measuring signals sent by the network equipment and determining the number of available wave beams; and selecting a number of beams from said set of number of beams in dependence on said number of available beams;
a sending module: for feeding back the selected number of beam information to the network device.
In the network device and the terminal device, the sending module may be implemented by a transmitter, the receiving module is implemented by a receiver, and the processing module is implemented by at least one processor.
In the above scheme, the terminal device can autonomously select the number of the fed-back beams from the beam number set, so that the terminal device can flexibly feed back beam information.
In a third aspect, a method for indicating the number of feedback beams is provided, including:
the network equipment informs the terminal equipment of the number of the beams required to be fed back by the terminal equipment;
receiving a request message sent to network equipment by terminal equipment according to a beam measurement result of a period of time, wherein the request message is used for requesting to change the number of feedback beams;
and sending a response message to the terminal equipment, wherein the response message indicates whether the request of the terminal equipment is allowed or not.
The network device may determine whether to allow the request of the terminal device according to its own capability.
In another aspect, a method for indicating the number of feedback beams is provided, including:
the terminal equipment receives the beam quantity which is sent by the network equipment and requires the feedback of the terminal equipment;
the terminal equipment sends a request message to the network equipment according to a beam measurement result of a period of time so as to request to change the number of the fed-back beams;
and the terminal equipment feeds back beam information to the network equipment according to the response message of the network equipment.
For example, the request message may be transmitted through a Physical Uplink Control Channel (PUCCH).
If the network equipment agrees with the request of the terminal equipment, the terminal equipment adopts the changed beam quantity to feed back beam information; that is, the beam information is fed back using the increased or decreased number of beams.
If the base station rejects the request of the terminal equipment, the terminal equipment still adopts the beam quantity notified by the base station or defined in advance to feed back the beam information;
the above two aspects belong to the same scheme, and are described from the perspective of network equipment and terminal equipment, respectively.
In addition, the number of beams required to be fed back by the terminal device may be sent through CSI-RS report configuration, RRC signaling, or other signaling.
In another scheme, the number of beams required to be fed back by the terminal device may be preset, and the network device is not required to notify the terminal device.
With reference to the above two aspects, the request message carries the number of beams suggested for feedback; or carry a suggested number of beams to increase or decrease.
With reference to the above two aspects, the network device may notify the terminal device of the maximum number N of beams allowed to be fed back by the terminal device, or; the network device and the terminal device preset the maximum number N of beams allowing feedback, and specifically refer to the description in the first aspect.
In combination with the above aspect, it is proposed that the number of beams fed back cannot exceed the maximum number of beams N, or that the number of beams fed back cannot exceed the maximum number of beams N after increasing the number of beams.
To the method of the third aspect, a network device is further disclosed, including:
a sending module: the terminal equipment is used for informing the number of the beams required to be fed back by the terminal equipment;
a receiving module: the terminal equipment is used for receiving a request message sent to the network equipment by the terminal equipment according to a beam measurement result of a period of time, wherein the request message is used for requesting to change the number of feedback beams;
the sending module is further configured to send a response message to the terminal device, indicating whether to allow the request of the terminal device.
The sending module is further configured to send a downlink measurement signal, so that the terminal device can perform beam measurement conveniently.
The method can further comprise the following steps: the user can determine whether to allow the request of the terminal device according to the capability of the network device.
To the method of the third aspect, a terminal device is further disclosed, including:
a receiving module: the device comprises a receiving module, a processing module and a feedback module, wherein the receiving module is used for receiving the beam quantity which is sent by the network equipment and requires the feedback of the terminal equipment;
a processing module: the system is used for measuring wave beams according to downlink measurement signals issued by network equipment;
a sending module: the network equipment is used for sending a request message to the network equipment according to the beam measurement result of a period of time so as to request to change the number of the fed back beams;
the sending module is further configured to feed back beam information to the network device according to the response message of the network device.
In the network device and the terminal device, the sending module may be implemented by a transmitter, the receiving module is implemented by a receiver, and the processing module is implemented by at least one processor.
In the above scheme, the terminal device can request to change the number of the feedback beams, so that the terminal device can flexibly feed back beam information.
In the schemes of the above aspects, M and N are both positive integers.
Yet another aspect of the present invention provides a computer program product containing instructions which, when run on a computer, cause the computer to perform the method of the above aspects.
Yet another aspect of the present invention provides a computer-readable storage medium having stored therein instructions, which, when executed on a computer, cause the computer to perform the method of the above-described aspects.
In the methods and apparatuses of the above aspects of the present invention, the terminal device can flexibly feed back the beam information, and further, the network device can realize flexible scheduling conveniently, and resources are saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a beam scanning process;
fig. 2 is a schematic diagram of an application scenario network architecture according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for indicating the number of feedback beams according to an embodiment of the present invention;
fig. 4 is a flowchart of a method for indicating the number of feedback beams according to another embodiment of the present invention;
FIG. 5 is a flow chart of a method for indicating the number of feedback beams according to another embodiment of the present invention;
FIG. 6 is a schematic diagram of a network device provided by an embodiment of the invention;
fig. 7 is a schematic diagram of a terminal device provided in an embodiment of the present invention;
fig. 8 is a schematic diagram of a network device/terminal device according to another embodiment of the present invention.
Detailed Description
Fig. 2 is a schematic diagram of an application scenario provided in the embodiment of the present invention. The networking architecture shown in fig. 2 mainly includes a network device 21 and a terminal device 22. The network device 21 communicates with the terminal device 22 using a millimeter wave Band of a relatively high frequency, which is typically a Band greater than 6GHz or more, for example, 28GHz or 38GHz, or an enhanced bandwidth (E-Band) Band covering a small area data plane. The terminal device 22 under the coverage of the network device 21 may communicate with the network device 21 using the millimeter wave band with the higher frequency.
The network device may include one or more transmission/reception points TRP, where the management of TRP in each cell may be handled by a centralized controller.
Terminal device 22 in embodiments of the present invention may refer, among other things, to an access terminal, subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or user equipment. An access terminal may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device having Wireless communication capabilities, a computing device or other processing device connected to a Wireless modem, a vehicle mounted device, a wearable device, a terminal in a 5G network, etc.
The network device 21 in the implementation of the present invention is a network side device operating in a frequency band above 6GHz (including 6GHz), for example, an access point of Wireless-Fidelity (Wi-Fi), a base station of next generation communication, such as a gNB or a small station of 5G, a micro station, a TRP, and may also be a relay station, an access point, a vehicle-mounted device, a wearable device, etc. operating in a high frequency band.
The following embodiments are described by taking a network device as a base station as an example.
Example one
The network device sets the maximum number N of available beams which can allow the terminal device to feed back the measurement, informs the terminal device, and can further indicate whether the terminal device can autonomously select the number of the fed-back beams. Referring to fig. 3, the method includes:
101. the network equipment informs the terminal equipment of the maximum beam number N allowed to be fed back by the terminal equipment;
the base station predefines the maximum beam number N allowed to be fed back by the terminal equipment based on the self capacity and informs the terminal equipment; for example: the maximum number N of beams available for the terminal device to feedback may be broadcasted through a system message, such as mib (master information block)/sib (system information block), and the system message may further include a threshold for measuring beam quality, such as RSRP, RSRQ, and other thresholds; of course, the maximum number N of available beams and the threshold value that allow feedback may also be sent to the terminal device along with CSI-RS reporting configurations (CSI-RS reporting settings), which may also be notified in other manners, such as RRC signaling, or may be sent separately, for example: the maximum number N of available beams is carried by the CSI-RS report configuration, and the threshold value is carried by the RRC signaling, or vice versa, which is not limited in the embodiment of the present invention.
In addition, the network device may not adopt an active notification manner, but a preset manner, and the network device and the terminal device preset the maximum number N of beams allowed to be fed back, so that the network device is not required to actively notify the terminal device.
102. The network equipment sends down the down measuring signal;
the base station may transmit a downlink measurement signal by using a transmission Beam, so as to facilitate the terminal device to perform Beam measurement, where the downlink measurement signal may be a BRS (Beam reference signal), a CSI-RS (channel state information-reference signal), an RS (reference signal), or other types of measurement signals.
103. The network equipment sends the indication information of whether the terminal equipment is allowed to autonomously select the number of the feedback beams to the terminal equipment;
the base station may notify through L1/L2/L3 signaling, for example, through DCI (downlink control information) or 1-bit information in the MAC CE, indicate whether the terminal device is allowed to autonomously select the number of beams to be reported when feeding back the beam quality subsequently, or may also use RRC signaling for notification, which is not limited in this embodiment; the step is optional, and the system may allow the terminal device to autonomously select the number of reported beams by default.
104. The terminal equipment carries out beam measurement based on the downlink measurement signals, determines the number M of available beams and carries out beam information feedback by combining with the maximum number N of beams.
The terminal device compares the measured quality of each beam with a preset threshold value, or compares the measured quality of each beam with a threshold value issued by the network device, such as the RSRP/RSRQ threshold value; selecting beams exceeding a threshold value as available beams, and then comparing the number M of available beams with the maximum number N of beams to determine the number of beams to be reported, for example:
if the number M of the available beams selected by the terminal equipment is larger than N, the terminal equipment feeds back the beam information of the best N beams in the M available beams, or randomly selects N beams from the M beams for feeding back; if the number M of the available beams selected by the terminal equipment is less than or equal to N, the terminal equipment only feeds back the beam information of the M beams.
Optionally, if the indication information in 103 indicates that the terminal device is allowed to autonomously select the number of beams to be reported, step 104 is executed, otherwise, the terminal device is not allowed to autonomously select the number of beams to be reported, and the terminal device may report the beam information of N beams, that is, report by using the maximum value in step 101, or report by using a default value of the system.
The terminal device may report the beam information in a PUSCH (physical uplink shared channel), or may feed back in a PUCCH (physical uplink control channel), and this embodiment is not limited, and first indicates the number of beams using several bits, for example: can adopt
Figure BDA0001219516680000091
The number of feedback beams is indicated by one bit, log2(. cndot.) denotes taking the base 2 logarithm,
Figure BDA0001219516680000092
represents taking an integer not less than y; then, the beam information of each beam, such as beam identification and beam quality, is fed back in sequence.
On one hand, the scheme only needs 1bit to indicate whether the terminal equipment can independently select the number of the fed-back wave beams, so that the overhead of the system is reduced. On the other hand, the network equipment determines the maximum number of feedback beams, and the terminal equipment autonomously performs beam measurement and selects an available beam for feedback, so that the beam information reported by the terminal equipment is more effective, and the reporting mode is more flexible.
Example two
The base station predefines several beam numbers allowing the terminal device to feed back, such as 1, 2, 4 or 8, etc., and informs the terminal device as a set, the maximum beam number fed back is related to the capability of the base station, and may be greater than 8, and is set according to the actual capability. Then, the terminal device selects one of the several numbers to report according to the measurement result. Referring to fig. 4, the specific process is as follows:
201. the network equipment informs the terminal equipment of the set of the number of the beams allowed to be fed back by the terminal equipment;
the notification method is similar to that in step 101, and is not described in detail, except that the network device of this embodiment notifies a set of a plurality of beam numbers that allow the terminal device to feed back, for example: the notification can be carried out through system information, CSI-RS report configuration, RRC and other modes; in addition, the threshold values of beam measurement, such as RSRP, RSRQ, etc., may be further notified;
in another example, the set of beam numbers may be predefined, as defined in the protocol, or the network device and the terminal device are preset, and the terminal device directly selects the beam number using the predefined set of beams without being notified by the network device.
202. In the same step 102, in the prior art, the base station may transmit the downlink measurement signal by using the transmit beam, which is convenient for the terminal device to perform beam measurement and is not described in detail;
203. the terminal equipment carries out beam measurement based on the downlink measurement signals, determines the number M of available beams, and selects proper beam number from the set according to the number M of the available beams to feed back beam information;
the terminal device compares the measured quality of each beam with a preset threshold value, or compares the measured quality of each beam with a threshold value issued by the network device, such as the RSRP/RSRQ threshold value; the beams exceeding the threshold are selected as the available beams, and the process is similar to the embodiment and will not be described in detail.
The terminal device may select an appropriate number from the set, such as a number closest to the number M of available beams for beam feedback, for example: the set is {1, 2, 4 or 8}, and if the terminal device measures that the available beam is 3, 2 or 4 beams can be selected for beam feedback;
in addition, the feedback beam number may be further selected with reference to a resource overhead saving manner, such as selecting a beam number less than the available beam number M for feedback, for example: the set is {1, 2, 4 or 8}, and the terminal device measures the number of available beams to be 3, then beam information of 2 optimal beams or any 2 beams can be selected for feedback, and in addition, 1 optimal beam can also be selected.
In addition, a number closest to the number M of available beams and smaller than M may be selected, and similar to the above case, beam information of 2 optimal or any 2 beams thereof may be selected to be fed back.
The terminal device may report corresponding beam information in a PUSCH (physical uplink shared channel) or a PUCCH (physical uplink control channel), which is not limited in this embodiment. When the terminal equipment feeds back, the terminal equipment needs to be used firstly
Figure BDA0001219516680000101
Bits to represent the number of beams fed back, L being the number of elements in the set, where log2(. cndot.) denotes taking the base 2 logarithm,
Figure BDA0001219516680000102
represents taking an integer not less than y; then, thenAnd feeding back the beam information of each beam, such as beam identification and beam quality.
The scheme allows the terminal equipment to autonomously select the number of the reported beams by default, and can further reduce the signaling overhead.
EXAMPLE III
Since the wireless environment or service scenario of different terminal devices may change frequently, and the requirement for the number of beams may also change, the number of beams to be fed back needs to be changed according to the measurement result over a period of time. The process refers to fig. 5, including:
301. the network equipment informs the terminal equipment of the number of the beams required to be fed back by the terminal equipment;
the base station can preset a fixed number of wave beams, and informs the number of the wave beams to the terminal equipment, so that the terminal equipment can report the number of the wave beams conveniently; the notification method is similar to that in step 101 and will not be described in detail, except that the network device in this embodiment notifies a fixed beam number that requires the terminal device to feed back, for example, the notification can be performed in a system message, CSI-RS report configuration, RRC, and other manners; in addition, the threshold value of beam measurement, such as RSRP/RSRQ, may be further notified;
in addition, further, the base station may also notify the terminal device of the maximum number N of beams allowed to be fed back by the terminal device, or; the network device and the terminal device preset the maximum number N of beams allowing feedback, which may specifically refer to the description in step 101.
The fixed beam number may also be predefined, for example, predefined in a protocol, or predefined by a network device and a terminal device, so that the terminal device may directly adopt the predefined beam number without being notified by the network device.
302. In the same step 102, in the prior art, the base station may transmit the downlink measurement signal by using the transmit beam, which is convenient for the terminal device to perform beam measurement and is not described in detail;
303. the terminal equipment sends a request message to the network equipment according to the beam measurement result of a period of time to request to change the number of feedback beams;
such as: the terminal device measures the beams according to the downlink measurement signals sent by the network device within a period of time, finds that only 2 available beams can be detected, and the number of beams required to be fed back by the base station or the predefined number is 4, the terminal device can request the base station to reduce the number of feedback beams of the base station to reduce the overhead; or the terminal device can detect 8 available beams in a period of time, and the base station requires the number of beams fed back or the predefined number to be 4, the base station may also be requested to increase the number of beams fed back.
In addition, the request message for changing the number of feedback beams may only require to increase or decrease the number of beams, or may include the number of beams for which feedback is suggested, for example, 2 or 8; or may comprise increasing or decreasing the number of beams, for example by 2 or by 4.
In addition, optionally, when the number of beams is increased, it is recommended that the number of beams fed back cannot exceed the maximum number of beams N, or after the number of beams is increased, the number of beams fed back cannot exceed the maximum number of beams N; for example, when N is 8, it is recommended that the number of feedback beams is 8 at the maximum, or if the number of existing feedback beams is 4, the number of feedback beams to be added is 4 at the maximum, so that 8 is not exceeded.
The request message may be transmitted through PUCCH or PUSCH, but the present embodiment is not limited thereto.
304. The network equipment sends a response message to the terminal equipment, and the response message is used for informing the terminal equipment whether to allow the request of the terminal equipment.
For example; the base station may send a response message to the terminal device through L1/L2 signaling according to its own capability, for example, the request for increasing or decreasing the number of beams may be indicated by 1bit of information in DCI or MAC CE, or the request for rejecting the terminal device may be also indicated.
305. The terminal equipment feeds back the wave beam to the network equipment according to the response message of the network equipment;
if the base station agrees with the request of the terminal equipment, the new beam number is adopted to feed back beam information; that is, the beam information is fed back using the increased or decreased number of beams.
If the base station rejects the request of the terminal equipment, the beam information is still fed back by adopting the beam quantity notified or predefined by the base station;
based on the network device in the first embodiment of the method, a network device is also disclosed, with reference to fig. 6, including:
the sending module 601: the terminal equipment is informed of the maximum beam number N allowed to be fed back by the terminal equipment; sending down measuring signals so as to measure beams with the terminal equipment according to the down measuring signals and determine the number M of available beams;
the receiving module 602: and the terminal equipment is used for receiving the beam information fed back by the terminal equipment, wherein the number of the feedback beams is determined by the terminal equipment according to the maximum beam number N and the available beam number M.
The sending module 601 is further configured to: and informing the terminal equipment of the indication information of whether the terminal equipment is allowed to select the feedback beam number.
Based on the terminal device in the first embodiment of the method, a terminal device is also disclosed, with reference to fig. 7, including:
the receiving module 701: the maximum beam number N is used for receiving the maximum beam number N which is issued by the network equipment and allows the terminal equipment to feed back;
the processing module 702: the device is used for measuring wave beams according to the downlink measuring signals sent by the network equipment and determining the number M of available wave beams;
the sending module 703: and the device is used for feeding back beam information to the network equipment according to the maximum beam number N and the available beam number M.
The sending module 703 is configured to implement at least one of the following functions:
if the number M of available beams is less than or equal to the maximum number N of beams, feeding back beam information of the M beams to the network equipment;
and if the number M of the available beams is larger than the maximum number N of the beams, feeding back the beam information of the optimal N beams in the M beams to the network equipment.
The receiving module 701 is further configured to receive indication information, which is sent by a network device, whether to allow the terminal device to select the number of feedback beams.
The network device and the terminal device completely correspond to the network device and the terminal device in the first embodiment of the method, and corresponding modules execute corresponding steps, for example, a sending module executes a step of sending a class in the embodiment of the method, a receiving module executes a step of receiving the class in the embodiment of the method, and other steps are implemented by a processing module.
Based on the network device in the second embodiment of the method, a network device is also disclosed, with reference to fig. 6, including:
the sending module 601: the terminal equipment is informed of the set of the beam number allowed to be fed back by the terminal equipment; sending down measuring signals so that the terminal equipment can measure wave beams according to the down measuring signals and determine the number of available wave beams;
the receiving module 602: and the terminal equipment is used for receiving beam information fed back by the terminal equipment, wherein the number of beams is the number of beams selected from the set of the number of beams by the terminal equipment according to the available number of beams.
Based on the terminal device in the second embodiment of the method, a terminal device is also disclosed, with reference to fig. 7, including:
the receiving module 701: the device comprises a receiving unit, a feedback unit and a feedback unit, wherein the receiving unit is used for receiving a set of beam numbers which are issued by network equipment and allow the terminal equipment to feed back;
the processing module 702: the device is used for measuring wave beams according to the downlink measuring signals sent by the network equipment and determining the number of available wave beams; and selecting a number of beams from said set of number of beams in dependence on said number of available beams;
the sending module 703: for feeding back the selected number of beam information to the network device.
Wherein the selected number of beams is less than the available number of beams, or is closest to the available number of beams, or is less than and closest to the available number of beams.
The network device and the terminal device completely correspond to the network device and the terminal device in the second embodiment of the method, and corresponding modules execute corresponding steps, for example, a sending module executes a step of sending a class in the embodiment of the method, a receiving module executes a step of receiving the class in the embodiment of the method, and other steps are implemented by a processing module.
Based on the network device in the third embodiment of the method, a network device is also disclosed, with reference to fig. 6, including:
the sending module 601: the terminal equipment is used for informing the number of the beams required to be fed back by the terminal equipment;
the receiving module 602: the terminal equipment is used for receiving a request message sent to the network equipment by the terminal equipment according to a beam measurement result of a period of time, wherein the request message is used for requesting to change the number of feedback beams;
the sending module 601 is further configured to send a response message to the terminal device, indicating whether to allow the request of the terminal device.
The sending module 601 is further configured to send a downlink measurement signal, which is convenient for the terminal device to perform beam measurement.
Wherein, further comprising, a processing module (not shown in the figure): the user can determine whether to allow the request of the terminal device according to the capability of the network device.
Based on the terminal device in the third method embodiment, a terminal device is also disclosed, with reference to fig. 7, including:
the receiving module 701: the device comprises a receiving module, a processing module and a feedback module, wherein the receiving module is used for receiving the beam quantity which is sent by the network equipment and requires the feedback of the terminal equipment;
the processing module 702: the system is used for measuring wave beams according to downlink measurement signals issued by network equipment;
the sending module 703: the network equipment is used for sending a request message to the network equipment according to the beam measurement result of a period of time so as to request to change the number of the fed back beams;
the sending module 703 is further configured to feed back beam information to the network device according to the response message of the network device.
The network device and the terminal device completely correspond to the network device and the terminal device in the third embodiment of the method, and corresponding modules execute corresponding steps, for example, a sending module executes a step of sending a class in the embodiment of the method, a receiving module executes a step of receiving the class in the embodiment of the method, and other steps are implemented by a processing module.
In addition, the network device and the terminal device in each of the above apparatus embodiments have another form of embodiment, that is, the function of the sending module is implemented by a transmitter, the function of the receiving module is implemented by a receiver, and corresponding steps of other method embodiments are implemented by a processor, for example, the function of the processing module is implemented by a processor, and the functions of the transmitter, the receiver and the processor can refer to corresponding steps of the method embodiments, and are not described in detail.
The network device or terminal device may be specifically configured as shown in fig. 8, wherein the processor 810 may be a general processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array, or other programmable logic device.
Transmitter 832 and receiver 834 may comprise a transceiver 830. The antenna 840 can be further included, and the number of the antenna 840 can be one or more. The network device or terminal device may also include a user interface 860, such as a keypad, microphone, speaker and/or touch screen. The user interface 860 is used to transfer content and control operational instructions.
The various components described above may be coupled together by a bus 850, where bus 850 includes a power bus, a control bus, and a status signal bus in addition to a data bus. But for clarity of illustration the various busses are labeled in the figures as bus 850.
Additionally, Memory 820 may be further included, and may include Read Only Memory (ROM) and/or Random Access Memory (RAM), or other types of dynamic storage devices that may store information and instructions, or may be a disk Memory. Memory 820 may be used to hold instructions for implementing the associated methods provided by embodiments of the present invention.
FIG. 8 is a schematic diagram, and may include other elements or only some of the elements, including for example a transmitter and a receiver; or may comprise only a transmitter, receiver, and processor.
In a particular embodiment, the memory is configured to store computer-executable program code, wherein the program code comprises instructions that, when executed by the processor, cause the network device or terminal device to perform the corresponding steps in the method embodiments.
In the method and the apparatus of each embodiment of the present invention, the terminal device can flexibly feed back the beam information, which further facilitates the base station to realize flexible scheduling and save resources.
The terms "first," "second," "third," and "fourth," etc. in the description, claims, and drawings of the present invention are used for distinguishing between different objects and not necessarily for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, system, article, or apparatus.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.

Claims (11)

1. A method of indicating a number of feedback beams, comprising: the network equipment informs the terminal equipment of the maximum beam number N allowed to be fed back by the terminal equipment; the network equipment issues downlink measurement signals so that terminal equipment can measure beams according to the downlink measurement signals and determine the number M of available beams, wherein the downlink measurement signals comprise beam reference signals BRS, channel state information reference signals CSI-RS or reference signals RS;
receiving beam information fed back by the terminal equipment, wherein the number of feedback beams is determined by the terminal equipment according to the maximum beam number N and the available beam number M;
wherein, according to the maximum number of beams N and the number of available beams M, feeding back information to the network device includes at least one of: if the number M of available beams is less than or equal to the maximum number N of beams, feeding back beam information of the M beams to the network equipment; and if the number M of the available beams is larger than the maximum number N of the beams, feeding back the beam information of the optimal N beams in the M beams to the network equipment.
2. The method of claim 1, wherein receiving the beam information fed back by the terminal device further comprises:
and the network equipment informs the terminal equipment of the indication information of whether the terminal equipment is allowed to select the feedback beam number.
3. A method of indicating a number of feedback beams, comprising:
the terminal equipment receives the maximum beam number N which is issued by the network equipment and allows the terminal equipment to feed back;
performing beam measurement according to a downlink measurement signal issued by the network equipment, and determining the number M of available beams, wherein the downlink measurement signal comprises a beam reference signal BRS, a channel state information reference signal CSI-RS or a reference signal RS;
feeding back beam information to the network equipment according to the maximum beam number N and the available beam number M;
wherein, according to the maximum number of beams N and the number of available beams M, feeding back information to the network device includes at least one of: if the number M of available beams is less than or equal to the maximum number N of beams, feeding back beam information of the M beams to the network equipment; and if the number M of the available beams is larger than the maximum number N of the beams, feeding back the beam information of the optimal N beams in the M beams to the network equipment.
4. A method of indicating a number of feedback beams, comprising:
the network equipment informs the terminal equipment of the set of the number of the beams allowed to be fed back by the terminal equipment;
the network equipment sends down measurement signals to facilitate the terminal equipment to measure beams according to the down measurement signals and determine the number of available beams, wherein the down measurement signals comprise beam reference signals BRS, channel state information reference signals CSI-RS or reference signals RS;
receiving beam information fed back by the terminal device, wherein the number of feedback beams is the number of beams selected by the terminal device from the set of the number of beams according to the number of available beams, and the selected number of beams is smaller than the number of available beams, or is closest to the number of available beams, or is smaller than and closest to the number of available beams.
5. A method of indicating a number of feedback beams, comprising:
the terminal equipment receives a set which is issued by the network equipment and allows the number of beams fed back by the terminal equipment;
performing beam measurement according to a downlink measurement signal issued by the network equipment, and determining the number of available beams, wherein the downlink measurement signal comprises a beam reference signal BRS, a channel state information reference signal CSI-RS or a reference signal RS;
selecting a beam number from the set of beam numbers according to the available beam number, and feeding back the selected beam information to the network equipment;
wherein the selected number of beams is less than the available number of beams, or is closest to the available number of beams, or is less than and closest to the available number of beams.
6. A network device, comprising:
a sending module: the terminal equipment is informed of the maximum beam number N allowed to be fed back by the terminal equipment; sending downlink measurement signals to facilitate terminal equipment to measure beams according to the downlink measurement signals and determine the number M of available beams, wherein the downlink measurement signals comprise beam reference signals BRS, channel state information reference signals CSI-RS or reference signals RS;
a receiving module: the terminal equipment is used for receiving beam information fed back by the terminal equipment, wherein the number of feedback beams is determined by the terminal equipment according to the maximum beam number N and the available beam number M;
wherein, according to the maximum number of beams N and the number of available beams M, feeding back information to the network device includes at least one of: if the number M of available beams is less than or equal to the maximum number N of beams, feeding back beam information of the M beams to the network equipment; and if the number M of the available beams is larger than the maximum number N of the beams, feeding back the beam information of the optimal N beams in the M beams to the network equipment.
7. The device of claim 6, wherein the transmitting module is further to:
and informing the terminal equipment of the indication information of whether the terminal equipment is allowed to select the feedback beam number.
8. A terminal device, comprising:
a receiving module: the maximum beam number N is used for receiving the maximum beam number N which is issued by the network equipment and allows the terminal equipment to feed back;
a processing module: the network equipment is used for measuring beams according to downlink measurement signals sent by the network equipment and determining the number M of available beams, wherein the downlink measurement signals comprise beam reference signals BRS, channel state information reference signals CSI-RS or reference signals RS;
a sending module: the device is used for feeding back beam information to the network equipment according to the maximum beam number N and the available beam number M;
the sending module is used for realizing at least one of the following functions:
if the number M of available beams is less than or equal to the maximum number N of beams, feeding back beam information of the M beams to the network equipment; and if the number M of the available beams is larger than the maximum number N of the beams, feeding back the beam information of the optimal N beams in the M beams to the network equipment.
9. The device of claim 8, wherein the receiving module is further configured to receive indication information sent by a network device whether to allow the terminal device to select the number of feedback beams.
10. A network device, comprising:
a sending module: the terminal equipment is informed of the set of the beam number allowed to be fed back by the terminal equipment; sending downlink measurement signals to facilitate terminal equipment to measure beams according to the downlink measurement signals and determine the number of available beams, wherein the downlink measurement signals comprise beam reference signals BRS, channel state information reference signals CSI-RS or reference signals RS;
a receiving module: and the terminal equipment is used for receiving the beam information fed back by the terminal equipment, wherein the number of the beams is the number of the beams selected from the set of the number of the beams by the terminal equipment according to the available number of the beams, and the selected number of the beams is smaller than the available number of the beams, or is closest to the available number of the beams, or is smaller than and closest to the available number of the beams.
11. A terminal device, comprising:
a receiving module: the device comprises a receiving unit, a feedback unit and a feedback unit, wherein the receiving unit is used for receiving a set of beam numbers which are issued by network equipment and allow the terminal equipment to feed back;
a processing module: the device is used for measuring wave beams according to the downlink measuring signals sent by the network equipment and determining the number of available wave beams; and selecting a beam number from the set of beam numbers according to the available beam number, wherein the selected beam number is smaller than the available beam number, or is closest to the available beam number, or is smaller than and closest to the available beam number, and the downlink measurement signal comprises a Beam Reference Signal (BRS), a channel state information reference signal (CSI-RS) or a Reference Signal (RS);
a sending module: for feeding back the selected number of beam information to the network device.
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