CN108242949B - Base station and terminal, multi-user transmission system composed of base station and terminal and multi-user transmission method - Google Patents
Base station and terminal, multi-user transmission system composed of base station and terminal and multi-user transmission method Download PDFInfo
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- CN108242949B CN108242949B CN201611221752.6A CN201611221752A CN108242949B CN 108242949 B CN108242949 B CN 108242949B CN 201611221752 A CN201611221752 A CN 201611221752A CN 108242949 B CN108242949 B CN 108242949B
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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
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
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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
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0868—Hybrid systems, i.e. switching and combining
- H04B7/088—Hybrid systems, i.e. switching and combining using beam selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
Abstract
The invention discloses a base station, a terminal, a multi-user transmission system composed of the base station and the terminal and a multi-user transmission method, and relates to the technical field of wireless communication. The invention can cover all the wave beam directions by periodically and randomly generating the orthogonal wave beams, so that the base station and the terminal only need to acquire and feed back the channel information aiming at the randomly generated orthogonal wave beams each time, thereby reducing the downlink pilot frequency expense, the uplink feedback expense and the space search complexity of the system. And the downlink pilot frequency overhead, the uplink feedback overhead and the space search complexity of the system can be further reduced through two-stage matching and feedback of the wide beam and the narrow beam. The invention may be applied to multi-user transmission of, for example, millimeter-wave large-scale antenna systems.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a base station, a terminal, and a multi-user transmission system and a multi-user transmission method formed by the base station and the terminal.
Background
The system using the millimeter wave long wave band as the carrier frequency is generally called as a millimeter wave system, and the band has abundant idle spectrum resources and can effectively meet the requirements of 5G in the future on higher capacity and higher speed. And with the improvement of the carrier frequency band, the distance between the antenna elements is gradually reduced, so that the application and the deployment of a large-scale antenna of a millimeter wave system become possible.
In a millimeter wave large-scale antenna system, a channel information acquisition and feedback method of a full antenna is currently used, and the method requires a base station to send a reference signal in each antenna direction and requires a terminal to feed back channel quality corresponding to each antenna direction, so that downlink pilot frequency overhead and uplink feedback overhead of the system are high, and complexity of space search is high.
Disclosure of Invention
The invention aims to solve the technical problems of large system overhead and high space search complexity of a millimeter wave large-scale system.
The invention provides a multi-user transmission method, which comprises the following steps: the base station periodically and randomly generates orthogonal wide beams at the base station side and orthogonal narrow beams in each wide beam direction, and informs the terminal of the index of the beams at the base station side, and the terminal periodically and randomly generates orthogonal wide beams at the terminal side and orthogonal narrow beams in each wide beam direction; the base station and the terminal train the wide beams, the terminal determines the matched wide beam at the base station side and the matched wide beam at the terminal side, and the base station receives the index of the matched wide beam at the base station side fed back by the terminal; the base station and the terminal further train the matched narrow beams in the wide beam direction, the terminal determines the matched narrow beams on the base station side and the terminal side from the matched narrow beams in the wide beam direction, and the base station receives indexes of the matched narrow beams on the base station side fed back by the terminal; the base station determines a beam required to be activated according to the index of the matched wide beam at the base station side and the index of the matched narrow beam at the base station side, which are fed back by the terminal; the base station transmits information to the corresponding terminal in the direction of the active beam.
The invention also provides a multi-user transmission method, which comprises the following steps: the terminal receives the indexes of the orthogonal wide beams at the base station side and the orthogonal narrow beams in each wide beam direction, which are periodically and randomly generated and notified by the base station, and the orthogonal wide beams at the terminal side and the orthogonal narrow beams in each wide beam direction are periodically and randomly generated by the terminal; the terminal and the base station train the wide beams, the terminal determines the matched wide beam at the base station side and the wide beam at the terminal side, and feeds back the index of the matched wide beam at the base station side to the base station; the terminal and the base station further train the narrow beams in the matched wide beam direction, the terminal determines the matched narrow beam on the base station side and the narrow beam on the terminal side from the matched narrow beams in the wide beam direction, and feeds back the index of the matched narrow beam on the base station side to the base station, so that the base station determines the beam needing to be activated according to the index of the matched wide beam on the base station side and the index of the matched narrow beam on the base station side, and transmits information to the corresponding terminal in the activated beam direction; the terminal receives the information transmitted by the base station in the narrow beam direction on the terminal side that matches the active beam.
The present invention also provides a base station for multi-user transmission, the base station comprising: a beam generating module, configured to periodically and randomly generate an orthogonal wide beam at the base station side and an orthogonal narrow beam in each wide beam direction, notify the terminal of an index of the beam at the base station side, and synchronously, the terminal periodically and randomly generates an orthogonal wide beam at the terminal side and an orthogonal narrow beam in each wide beam direction; the wide beam training module is used for training the wide beam with the terminal, determining the matched wide beam at the base station side and the matched wide beam at the terminal side by the terminal, and receiving the index of the matched wide beam at the base station side fed back by the terminal; the beam training module is used for further training the matched narrow beam in the wide beam direction with the terminal, determining the matched narrow beam at the base station side and the matched narrow beam at the terminal side from the matched narrow beam in the wide beam direction by the terminal, and receiving the index of the matched narrow beam at the base station side fed back by the terminal; the beam activation module is used for determining a beam required to be activated according to the index of the matched wide beam at the base station side and the index of the matched narrow beam at the base station side, which are fed back by the terminal; and the information transmission module is used for transmitting information to the corresponding terminal in the direction of the activated beam.
The present invention also provides a terminal, including: a beam information receiving module for receiving the orthogonal wide beams at the base station side and the indexes of the orthogonal narrow beams in each wide beam direction, which are periodically randomly generated and notified by the base station, and a beam generating module for periodically and randomly generating the orthogonal wide beams at the terminal side and the orthogonal narrow beams in each wide beam direction; the wide beam training module is used for training the wide beam with the base station, determining the matched wide beam at the base station side and the matched wide beam at the terminal side by the terminal, and feeding back the index of the matched wide beam at the base station side to the base station; the narrow beam training module is used for further training the matched narrow beam in the wide beam direction with the base station, the terminal determines the matched narrow beam at the base station side and the narrow beam at the terminal side from the matched narrow beam in the wide beam direction, and feeds back the index of the matched narrow beam at the base station side to the base station, so that the base station determines the beam needing to be activated according to the index of the matched wide beam at the base station side and the index of the matched narrow beam at the base station side, and transmits information to the corresponding terminal in the activated beam direction; and the transmission information receiving module is used for receiving the information transmitted by the base station in the narrow beam direction of the terminal side matched with the activated beam.
The present invention also provides a system for multi-user transmission, comprising: the aforementioned base station and the aforementioned terminal.
The invention can cover all the wave beam directions by periodically and randomly generating the orthogonal wave beams, so that the base station and the terminal only need to acquire and feed back the channel information aiming at the randomly generated orthogonal wave beams each time, thereby reducing the downlink pilot frequency expense, the uplink feedback expense and the space search complexity of the system. And the downlink pilot frequency overhead, the uplink feedback overhead and the space search complexity of the system can be further reduced through two-stage matching and feedback of the wide beam and the narrow beam. The invention may be applied to multi-user transmission of, for example, millimeter-wave large-scale antenna systems.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
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, and 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 these drawings without creative efforts.
Fig. 1 is a flow chart of an embodiment of the multi-user transmission method of the present invention.
Fig. 2A shows a schematic diagram of the broad beam training and matching of the present invention.
Fig. 2B shows a schematic diagram of narrow beam training and matching of the present invention.
Fig. 3 shows a schematic diagram of one example of beam re-matching of the present invention.
Fig. 4 shows a schematic structural diagram of the system for multi-user transmission according to the present invention.
Fig. 5 shows a schematic structural diagram of a base station for multi-user transmission according to the present invention.
Fig. 6 shows a schematic structure of a terminal for multi-user transmission according to the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The invention is provided aiming at the problems of large system overhead and high space search complexity of a millimeter wave large-scale system. The invention can cover all the wave beam directions by periodically and randomly generating the orthogonal wave beams, so that the base station and the terminal only need to acquire and feed back the channel information aiming at the randomly generated orthogonal wave beams each time, thereby reducing the downlink pilot frequency expense, the uplink feedback expense and the space search complexity of the system. And the downlink pilot frequency overhead, the uplink feedback overhead and the space search complexity of the system can be further reduced through two-stage matching and feedback of the wide beam and the narrow beam. The invention may be applied to multi-user transmission of, for example, millimeter-wave large-scale antenna systems.
In a large-scale antenna system, a transmitter can preprocess a transmission signal in a precoding mode and assist a receiver to eliminate the influence between channels. In the invention, the codebook used for precoding comprises a codebook corresponding to a wide beam and a codebook corresponding to a narrow beam.
On the base station side, the coverage angle of the base station is thetaBSEach wide beam angle is
Each narrow beam having a width of
Then the number of codebooks for the wide beam of the base station is
The number of codebooks containing narrow beams in each wide beam of the base station is
Wherein
Indicating rounding up.
On the terminal side, the coverage angle of the terminal is thetaUEEach wide beam angle is
Each narrow beam having a width of
The number of the wide beam codebooks of the terminal is
The number of narrow beam codebooks contained in each wide beam of the terminal is
In the present invention, descriptions of "first" and "second" and the like are used only to distinguish different objects unless particularly stated, and are not used to indicate the meaning of size, timing, or the like. For example, the first training sequence and the second training sequence are used to represent different training sequences.
Fig. 1 is a flowchart illustrating an embodiment of a multi-user transmission method according to the present invention. As shown in fig. 1, the method includes:
in step 102A, the base station periodically and randomly generates orthogonal wide beams on the base station side and orthogonal narrow beams in each wide beam direction, and notifies the terminal of the index of the base station side beam.
The base station can cover all beam directions of the base station side by periodically and randomly generating orthogonal wide beams at the base station side and orthogonal narrow beams in each wide beam direction.
For example, for a 9-port antenna system, assuming that 3 orthogonal beams are randomly generated each time, 9 ports of the antenna system may be fully covered over approximately 3 cycles.
In step 102B, the terminal periodically randomly generates orthogonal wide beams at the terminal side and orthogonal narrow beams in each wide beam direction.
The terminal can cover all beam directions of the terminal side by periodically and randomly generating orthogonal wide beams at the terminal side and orthogonal narrow beams in each wide beam direction.
It should be noted that the beam random generation timings of steps 102A and 102B need to be substantially synchronized, and there is no requirement for execution order.
In step 104, the base station and the terminal train the wide beam, the terminal determines the matched wide beam on the base station side and the matched wide beam on the terminal side, and the base station receives the index of the matched wide beam on the base station side fed back by the terminal.
Specifically, the base station transmits the first training sequence using any one of the wide beams (index i) on the base station side, and the terminal receives the first training sequence using any one of the wide beams (index j) on the terminal side, and records the reception power
And traversing all the wide beams on the base station side and the wide beams on the terminal side, and determining the wide beams on the base station side and the wide beams on the terminal side corresponding to the optimal receiving power as the matched wide beams on the base station side and the matched wide beams on the terminal side. The formula is expressed as:
wherein the content of the first and second substances,
and
indexes respectively indicating the matched base station-side wide beam and terminal-side wide beam, argmax { } indicates the largest.
Fig. 2A shows a schematic diagram of wide beam training and matching, and referring to fig. 2A, a base station side (BS) randomly generates wide beams 1,2,3, a terminal side (UE) randomly generates wide beams 1,2,3, and it is determined by the training that the wide beam 2 at the base station side and the wide beam 2 at the terminal side are matched wide beams.
In step 106, the base station and the terminal further train the matched narrow beam in the wide beam direction, the terminal determines the matched narrow beam on the base station side and the matched narrow beam on the terminal side from the matched narrow beam in the wide beam direction, and the base station receives the index of the matched narrow beam on the base station side fed back by the terminal.
Specifically, the base station transmits the second training sequence using a narrow beam (index i) on any base station side in the wide beam direction on the matched base station side, and the terminal receives the second training sequence using a narrow beam (index j) on any terminal side in the wide beam direction on the matched terminal side, and records the reception power
And traversing all the narrow beams at the base station side and the narrow beams at the terminal side, and determining the narrow beams at the base station side and the narrow beams at the terminal side corresponding to the optimal receiving power as the matched narrow beams at the base station side and the matched narrow beams at the terminal side. The formula is expressed as:
wherein the content of the first and second substances,
and
indexes respectively indicating a matched narrow beam on the base station side and a matched narrow beam on the terminal side, argmax { } indicates the maximum.
Further, the base station may pre-process the second training sequence using pre-coding information (e.g., information such as weight) corresponding to the matched wide beam on the base station side, and then transmit the second training sequence using a narrow beam on any base station side in the wide beam direction on the matched base station side.
Fig. 2B shows a schematic diagram of narrow beam training and matching, and referring to fig. 2B, a base station side (BS) randomly generates narrow beams 1,2,3, a terminal side (UE) randomly generates narrow beams 1,2,3, and it is determined through training that the narrow beam 2 on the base station side and the narrow beam 2 on the terminal side are matched narrow beams.
Further, the terminal determines codebook information based on a reference signal in the matched narrow beam at the base station side, and feeds back the codebook information while feeding back an index of the matched narrow beam at the base station side, and correspondingly, the base station receives the index of the matched narrow beam at the base station side and the codebook information reported by the terminal.
In step 108, the base station determines a beam to be activated according to the index of the matched wide beam at the base station side and the index of the matched narrow beam at the base station side, which are fed back by the terminal, and activates the beam. And the base station divides the terminals under the same active beam into one group.
For example, assume that the UE1 feeds back a broad beam index of
The narrow beam index is
The wide/narrow beam index fed back by the UE2 is
The wide/narrow beam index fed back by the UE3 is
UE4 inverseThe wide/narrow beam index of the feed is
The beams that the base station needs to activate are denoted as a { {1,1}, {1,4}, {2,7} }, and the terminal users under the same activated beam are divided into one group, i.e. the terminal users in the cell are grouped as a{1,1}＝{UE1},A{1,4}＝{UE2,UE4}，A{2,7}＝{UE3}。
In step 110, the base station transmits information to the corresponding terminal in the active beam direction. Accordingly, the terminal receives the information transmitted by the base station in the narrow beam direction of the terminal side matched with the active beam.
In one embodiment, the base station uses the matched narrow beam and codebook at the base station side to pre-process and transmit the pre-transmitted information, and the auxiliary terminal removes the influence between channels, and completes the transmission of the information to the corresponding terminal in the direction of the activated beam (i.e. the direction of the activated matched narrow beam at the base station side).
Taking the example of step 108 as an example, the base station activates beam A{1,1}In the direction of transmitting information to end user UE1, the base station is activating beam A{1,4}Transmitting information to end users UE2, UE4 in the direction that the base station is activating beam A{2,7}In the direction of information to the end user UE 3.
If there are multiple users in the user group corresponding to the same activated beam, the base station can transmit information to each terminal user in the group in the direction of the activated beam through a time division multiplexing or frequency division multiplexing mode. For example, for A{1,4}And the corresponding user group, the base station transmits information to the user UE2, UE4 through orthogonal time slot resources or orthogonal frequency resources respectively, so as to ensure that no interference exists between users in the same beam.
In addition, before transmitting information, the base station needs to configure the transmission power in the direction of the active beam according to the number of active beams. For example, the base station may configure the transmission power in the active beam direction on average according to the number of active beams. Assuming that the total transmission power of the base station is P, the transmission power of each active beam
Where | a | represents the number of active beams, i.e., the number of active narrow beams. For inactive beams, the base station may not transmit power.
The invention can cover all the wave beam directions by periodically and randomly generating the orthogonal wave beams, so that the base station and the terminal only need to acquire and feed back the channel information aiming at the randomly generated orthogonal wave beams each time, thereby reducing the downlink pilot frequency expense, the uplink feedback expense and the space search complexity of the system. And through two-stage matching and feedback of the wide beam and the narrow beam, when the wide beam is matched, the matching can be performed only on the narrow beam under the matched wide beam, so that the system downlink pilot frequency overhead, the uplink feedback overhead and the space search complexity are further reduced. In addition, orthogonal transmission is carried out through time or frequency under the condition of multiple users, so that the interference of the transmission of the multiple users is reduced, and the system performance is improved.
The base station can generate a period T according to the set random beambeamAnd determining whether to generate beams randomly again, if the random beam generation period is reached, randomly generating orthogonal beams again, and performing wide beam matching and narrow beam matching, namely re-executing the steps 102-106.
The base station can reconfigure the period T according to the set wide beamwideAnd determining whether to re-match the wide beam, and if the wide beam reconfiguration period is reached, re-performing the wide beam matching and the corresponding narrow beam matching, namely re-performing the steps 104-106.
The base station can reconfigure the period T according to the set narrow beamnarrowIt is determined whether to re-match the narrow beam and if the narrow beam reconfiguration period is reached, the narrow beam matching is re-performed, i.e. step 106 is re-executed.
Fig. 3 shows a schematic diagram of one example of beam re-matching.
Fig. 4 is a schematic structural diagram of the system for multi-user transmission of the present invention. As shown in fig. 4, the system 40 includes: a base station 50 and a terminal 60.
Fig. 5 is a schematic structural diagram of a base station 50 for multi-user transmission according to the present invention. As shown in fig. 5, the base station 50 includes:
a beam generating module 502, configured to periodically and randomly generate an orthogonal wide beam at the base station side and an orthogonal narrow beam in each wide beam direction, and notify the terminal of an index of the beam at the base station side, and synchronously, the terminal periodically and randomly generates an orthogonal wide beam at the terminal side and an orthogonal narrow beam in each wide beam direction;
a wide beam training module 504, configured to train the wide beam with the terminal, determine a matched wide beam at the base station side and a matched wide beam at the terminal side by the terminal, and receive an index of the matched wide beam at the base station side, which is fed back by the terminal;
a narrow beam training module 506, configured to train the matched narrow beam in the wide beam direction with the terminal, determine, by the terminal, a matched narrow beam on the base station side and a matched narrow beam on the terminal side from the matched narrow beam in the wide beam direction, and receive an index of the matched narrow beam on the base station side, which is fed back by the terminal;
a beam activation module 508, configured to determine a beam to be activated according to the index of the matched wide beam at the base station side and the index of the matched narrow beam at the base station side, which are fed back by the terminal; and
an information transmission module 510 for transmitting information to the corresponding terminal in the active beam direction.
The beam activation module 508 is further configured to divide the terminals under the same activated beam into a group, and the information transmission module 510 is configured to transmit information to the terminals in the group in a time division multiplexing or frequency division multiplexing manner in the activated beam direction.
The information transmission module 510 is further configured to configure the transmission power in the direction of the active beam according to the number of the active beams required.
The base station 50 may further include: the judging module is used for determining whether to generate the wave beam again randomly according to the random wave beam generating period; or, determining whether to re-match the wide beam according to the wide beam reconfiguration period; or, determining whether to re-match the narrow beam according to the narrow beam reconfiguration period.
Fig. 6 is a schematic structural diagram of a terminal 60 for multi-user transmission according to the present invention. As shown in fig. 6, the terminal 60 includes:
a beam information receiving module 602A for receiving the base station periodically randomly generated and notified of the orthogonal wide beams on the base station side and the indices of the orthogonal narrow beams in each wide beam direction,
a beam generating module 602B for periodically and randomly generating orthogonal wide beams at the terminal side and orthogonal narrow beams in each wide beam direction;
a wide beam training module 604, configured to train a wide beam with a base station, determine, by a terminal, a matched wide beam at the base station side and a matched wide beam at the terminal side, and feed back an index of the matched wide beam at the base station side to the base station;
a narrow beam training module 606, configured to train a narrow beam in the matched wide beam direction with the base station, where the terminal determines a matched narrow beam on the base station side and a narrow beam on the terminal side from the matched narrow beam in the wide beam direction, and feeds back an index of the matched narrow beam on the base station side to the base station, so that the base station determines a beam to be activated according to the index of the matched wide beam on the base station side and the index of the matched narrow beam on the base station side, and transmits information to the corresponding terminal in the activated beam direction;
and a transmission information receiving module 608, configured to receive information transmitted by the base station in a narrow beam direction of the terminal side matched with the active beam.
The wide beam training module 604 is configured to receive, using any one of the wide beams at the terminal side, a first training sequence transmitted by the base station using any one of the wide beams at the base station side, and record reception power, where the wide beam at the base station side and the wide beam at the terminal side corresponding to the optimal reception power are determined as a matched wide beam at the base station side and a matched wide beam at the terminal side.
The narrow beam training module 606 is configured to receive, by using a narrow beam at any terminal side in the matched wide beam direction at the terminal side, a second training sequence transmitted by the base station by using a narrow beam at any base station side in the matched wide beam direction at the base station side, and record reception power, where the narrow beam at the base station side and the narrow beam at the terminal side corresponding to the optimal reception power are determined as the narrow beam at the base station side and the narrow beam at the terminal side that are matched.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (19)
1. A method for multi-user transmission, the method comprising:
the base station periodically randomly generates orthogonal wide beams on the base station side and orthogonal narrow beams in each wide beam direction so as to cover all beam directions on the base station side after a plurality of periods, and notifies the terminal of the index of the base station side beam,
the terminal periodically and randomly generates orthogonal wide beams at the terminal side and orthogonal narrow beams in each wide beam direction so as to cover all beam directions at the terminal side after a plurality of periods;
the base station and the terminal train the wide beams, the terminal determines the matched wide beam at the base station side and the matched wide beam at the terminal side, and the base station receives the index of the matched wide beam at the base station side fed back by the terminal;
the base station and the terminal further train the matched narrow beams in the wide beam direction, the terminal determines the matched narrow beams on the base station side and the terminal side from the matched narrow beams in the wide beam direction, and the base station receives indexes of the matched narrow beams on the base station side fed back by the terminal;
the base station determines a beam required to be activated according to the index of the matched wide beam at the base station side and the index of the matched narrow beam at the base station side, which are fed back by the terminal;
the base station transmits information to the corresponding terminal in the direction of the active beam.
2. The method of claim 1, wherein the base station and the terminal train the wide beam, and wherein the determining by the terminal the matched base station-side wide beam and the terminal-side wide beam comprises:
the base station transmits a first training sequence by using any one of the wide beams on the base station side, and the terminal receives the first training sequence by using any one of the wide beams on the terminal side and records the received power, wherein the wide beam on the base station side and the wide beam on the terminal side corresponding to the optimal received power are determined as a matched wide beam on the base station side and a matched wide beam on the terminal side.
3. The method of claim 1, wherein the base station and the terminal further train for the matched narrow beam in the wide beam direction, and wherein the determining, by the terminal, the matched narrow beam at the base station side and the matched narrow beam at the terminal side from the matched narrow beam in the wide beam direction comprises:
and the base station transmits a second training sequence by using a narrow beam on any base station side in the matched wide beam direction on the base station side, and the terminal receives the second training sequence by using a narrow beam on any terminal side in the matched wide beam direction on the terminal side and records the receiving power, wherein the narrow beam on the base station side and the narrow beam on the terminal side corresponding to the optimal receiving power are determined as the matched narrow beam on the base station side and the matched narrow beam on the terminal side.
4. The method of claim 3, wherein the base station performs pre-processing on the second training sequence using pre-coding information corresponding to the matched wide beam on the base station side, and then transmits the second training sequence using a narrow beam on any base station side in the wide beam direction on the matched base station side.
5. The method of claim 1, further comprising:
the terminal determines codebook information of the terminal based on a reference signal in the narrow beam at the matched base station side, and feeds back the codebook information of the terminal while feeding back the index of the narrow beam at the matched base station side;
and the base station receives the matched narrow beam index and codebook information of the base station side reported by the terminal, uses the matched narrow beam and codebook of the base station side to preprocess and transmit the pre-transmitted information, and finishes transmitting the information to the corresponding terminal in the activated direction of the matched narrow beam of the base station side.
6. The method of claim 1, wherein the base station divides the terminals under the same active beam into a group, and wherein the base station transmits information to the terminals in the group in the direction of the active beam by time division multiplexing or frequency division multiplexing.
7. The method of claim 1, wherein the base station configures the transmit power in the direction of the active beam according to the number of active beams needed.
8. The method of claim 1,
the base station determines whether to generate the wave beam again randomly according to the random wave beam generation period; or the like, or, alternatively,
the base station determines whether to re-match the wide beam according to the wide beam reconfiguration period; or the like, or, alternatively,
the base station determines whether to re-match the narrow beam according to the narrow beam reconfiguration period.
9. A method for multi-user transmission, the method comprising:
the terminal receives the orthogonal wide beams at the base station side and the indexes of the orthogonal narrow beams in each wide beam direction, which are periodically and randomly generated and notified by the base station, so as to cover all beam directions at the base station side after a plurality of periods;
the terminal periodically and randomly generates orthogonal wide beams at the terminal side and orthogonal narrow beams in each wide beam direction so as to cover all beam directions at the terminal side after a plurality of periods;
the terminal and the base station train the wide beams, the terminal determines the matched wide beam at the base station side and the wide beam at the terminal side, and feeds back the index of the matched wide beam at the base station side to the base station;
the terminal and the base station further train the narrow beams in the matched wide beam direction, the terminal determines the matched narrow beam on the base station side and the narrow beam on the terminal side from the matched narrow beams in the wide beam direction, and feeds back the index of the matched narrow beam on the base station side to the base station, so that the base station determines the beam needing to be activated according to the index of the matched wide beam on the base station side and the index of the matched narrow beam on the base station side, and transmits information to the corresponding terminal in the activated beam direction;
the terminal receives the information transmitted by the base station in the narrow beam direction on the terminal side that matches the active beam.
10. The method of claim 9, wherein the terminal trains the wide beam with the base station, and wherein determining, by the terminal, the matched base station-side wide beam and terminal-side wide beam comprises:
the terminal receives a first training sequence transmitted by the base station using any one of the wide beams on the base station side using any one of the wide beams on the terminal side, and records reception power, wherein the wide beam on the base station side and the wide beam on the terminal side corresponding to the optimal reception power are determined as a matched wide beam on the base station side and a matched wide beam on the terminal side.
11. The method of claim 9, wherein the terminal and the base station further train the matched narrow beam in the wide beam direction, and wherein the determining, by the terminal, the matched narrow beam at the base station side and the matched narrow beam at the terminal side from the matched narrow beam in the wide beam direction comprises:
and the terminal receives a second training sequence transmitted by the base station by using the narrow beam of any base station side in the wide beam direction of the matched base station side by using the narrow beam of any terminal side in the wide beam direction of the matched terminal side, and records the receiving power, wherein the narrow beam of the base station side and the narrow beam of the terminal side corresponding to the optimal receiving power are determined as the narrow beam of the matched base station side and the narrow beam of the terminal side.
12. A base station for multi-user transmission, the base station comprising:
a beam generating module for periodically and randomly generating an orthogonal wide beam at the base station side and an orthogonal narrow beam in each wide beam direction so as to cover all beam directions at the base station side after a plurality of periods, and notifying the terminal of an index of the beam at the base station side, and synchronously, periodically and randomly generating an orthogonal wide beam at the terminal side and an orthogonal narrow beam in each wide beam direction at the terminal so as to cover all beam directions at the terminal side after a plurality of periods;
the wide beam training module is used for training the wide beam with the terminal, determining the matched wide beam at the base station side and the matched wide beam at the terminal side by the terminal, and receiving the index of the matched wide beam at the base station side fed back by the terminal;
the narrow beam training module is used for further training the matched narrow beam in the wide beam direction with the terminal, determining the matched narrow beam at the base station side and the matched narrow beam at the terminal side from the matched narrow beam in the wide beam direction by the terminal, and receiving the index of the matched narrow beam at the base station side fed back by the terminal;
the beam activation module is used for determining a beam required to be activated according to the index of the matched wide beam at the base station side and the index of the matched narrow beam at the base station side, which are fed back by the terminal;
and the information transmission module is used for transmitting information to the corresponding terminal in the direction of the activated beam.
13. The base station of claim 12, wherein the beam activation module is further configured to group terminals under the same activated beam into one group,
and the information transmission module is used for transmitting information to each terminal in the group in a time division multiplexing or frequency division multiplexing mode in the direction of the activated beam.
14. The base station of claim 12, wherein the information transmission module is further configured to configure the transmit power in the active beam direction according to the number of active beams needed.
15. The base station of claim 12, further comprising:
the judging module is used for determining whether to generate the wave beam again randomly according to the random wave beam generating period; or, determining whether to re-match the wide beam according to the wide beam reconfiguration period; or, determining whether to re-match the narrow beam according to the narrow beam reconfiguration period.
16. A terminal, characterized in that the terminal comprises:
a beam information receiving module for receiving the orthogonal wide beams at the base station side periodically randomly generated and notified by the base station and the index of the orthogonal narrow beam in each wide beam direction so as to cover all beam directions at the base station side after a plurality of periods;
a beam generating module for periodically and randomly generating orthogonal wide beams at the terminal side and orthogonal narrow beams in each wide beam direction so as to cover all beam directions at the terminal side after a plurality of periods;
the wide beam training module is used for training the wide beam with the base station, determining the matched wide beam at the base station side and the matched wide beam at the terminal side by the terminal, and feeding back the index of the matched wide beam at the base station side to the base station;
the narrow beam training module is used for further training the matched narrow beam in the wide beam direction with the base station, the terminal determines the matched narrow beam at the base station side and the narrow beam at the terminal side from the matched narrow beam in the wide beam direction, and feeds back the index of the matched narrow beam at the base station side to the base station, so that the base station determines the beam needing to be activated according to the index of the matched wide beam at the base station side and the index of the matched narrow beam at the base station side, and transmits information to the corresponding terminal in the activated beam direction;
and the transmission information receiving module is used for receiving the information transmitted by the base station in the narrow beam direction of the terminal side matched with the activated beam.
17. The terminal according to claim 16, wherein the wide beam training module is configured to receive a first training sequence transmitted by the base station using any of the wide beams on the base station side using any of the wide beams on the terminal side, and record reception power, wherein the wide beam on the base station side and the wide beam on the terminal side corresponding to the optimal reception power are determined as the matched wide beam on the base station side and the wide beam on the terminal side.
18. The terminal according to claim 16, wherein the narrow beam training module is configured to receive, using a narrow beam on any terminal side in the matched wide beam direction on the terminal side, a second training sequence transmitted by the base station using a narrow beam on any base station side in the matched wide beam direction on the base station side, and record reception power, wherein the narrow beam on the base station side and the narrow beam on the terminal side corresponding to the optimal reception power are determined as the matched narrow beam on the base station side and the narrow beam on the terminal side.
19. A system for multi-user transmission, comprising: the base station of any of claims 12-15 and the terminal of any of claims 16-18.
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| CN112203214A (en) * | 2019-06-20 | 2021-01-08 | 中兴通讯股份有限公司 | Terminal device positioning method and device, storage medium and electronic device |
| CN114731181A (en) * | 2019-12-31 | 2022-07-08 | 华为技术有限公司 | Beam training method and device |
| CN115001550B (en) * | 2022-05-26 | 2023-11-14 | 西安电子科技大学 | Multi-user wave beam quick alignment method for millimeter wave system |
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