CN107888257B - Beam selection method, device and base station - Google Patents
Beam selection method, device and base station Download PDFInfo
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- CN107888257B CN107888257B CN201610875480.5A CN201610875480A CN107888257B CN 107888257 B CN107888257 B CN 107888257B CN 201610875480 A CN201610875480 A CN 201610875480A CN 107888257 B CN107888257 B CN 107888257B
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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
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for 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
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
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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
- H04B7/0617—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
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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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/28—Cell structures using beam steering
Abstract
The invention discloses a beam selection method, a device and a base station, wherein the method comprises the following steps: calculating the priority of alpha wave beams corresponding to each direction of a cell alpha at each transmission time interval TTI; wherein, one direction corresponds to one beam, α all beams in each direction of α cover the whole cell together, and α is a positive integer; the priority comprises a broadcast priority or comprises a broadcast priority and a data priority; the broadcast priority is used for representing the priority of the beam required to transmit the broadcast signal; the data priority is used for representing the priority of user data to be transmitted by the beam; sorting the priority of the alpha wave beams in each calculated alpha direction to generate a priority queue; generating N wave beams transmitted by the current TTI according to the priority queue; and N is the number of beams which need to be generated simultaneously by the cell.
Description
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a method, an apparatus, and a base station for beam selection in a multi-antenna system.
Background
At present, a mobile communication network faces the expansion type increase of terminal data service volume, and a future communication system can achieve indexes of ultrahigh speed, large throughput, ultrahigh reliability, ultralow time delay and the like, and can provide optimal experience for users. However, the use efficiency of the conventional frequency band below 6GHz is close to the theoretical limit, so that the millimeter wave (mmWave) of the higher frequency band is considered to be an important way for realizing future communication by both academic circles and industrial circles.
Although the high frequency band has a larger available bandwidth, the high frequency band has the disadvantage of small coverage area due to larger path loss ratio. In order to increase the coverage area of the high frequency band, a multiple antenna beamforming (beamforming) technique may be employed. However, since a cell is limited by hardware conditions, a plurality of beams (beams) covering 360 degrees cannot be generated simultaneously, and only a few beams covering a partial area can be generated.
Meanwhile, as the cell has many idle users, the users need to acquire the synchronization information and read the system information broadcast first to access the cell. However, several beams generated by a cell can only point in several directions at the same time. Then, in order to ensure the normal access of users in the cell, the beam needs to periodically scan all directions of the cell, and broadcast the synchronization information and the system information. Meanwhile, in a cell, the connected users are distributed very dispersedly, so that the Qos requirements of the service are met, and the users can be guaranteed to obtain service fairly. Then the beam needs to serve the user in time intervals. Therefore, the beam needs to provide access information for idle users and also provide data services for connected users, and an efficient and fair method is needed to implement beam scheduling.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a beam selection method, apparatus and base station, which can ensure that a user accesses a cell smoothly and can provide data service for the user in time.
In order to achieve the object of the present invention, the present invention provides a beam selection method, including:
calculating the priority of alpha wave beams corresponding to each direction of a cell alpha in each Transmission Time Interval (TTI);
wherein, one direction corresponds to one beam, α all beams in each direction of α cover the whole cell together, and α is a positive integer; the priority comprises a broadcast priority or comprises a broadcast priority and a data priority; the broadcast priority is used for representing the priority of the beam required to transmit the broadcast signal; the data priority is used for representing the priority of the user data which needs to be transmitted by the beam;
sorting the priority of the alpha wave beams in each direction of alpha obtained by calculation to generate a priority queue;
generating N wave beams transmitted by the current TTI according to the priority queue; and N is the number of beams which need to be generated simultaneously by the cell.
Optionally, the priority factor of the broadcast priority is determined by at least the following parameters:
TTI, and the period of transmitting the broadcast signal.
Optionally, the calculating the priority of α beams in each direction of the cell α includes:
calculating the broadcast priority of the beam in each direction, and adding 1 to the corresponding priority factor; alternatively, the first and second electrodes may be,
and calculating the broadcast priority of the beam in each direction, adding 1 to the corresponding priority factor, calculating the priority of each data service corresponding to each beam, and using the priority factor of the data service with the highest priority to represent the data priority factor of each beam.
Optionally, the sorting the calculated priorities of α beams in each direction of α to generate a priority queue includes:
sequentially inquiring the broadcast priority of the wave beam in each direction, and adding the wave beam into a priority queue if the priority factor of the broadcast priority of the wave beam in one direction is equal to the period of transmitting broadcast signals;
and sequencing the data priority of the rest beams, and adding the rest beams into the priority queue according to the sequence of the data priority.
Optionally, the generating N beams transmitted by the current TTI according to the priority queue includes:
selecting N directional beams from the priority queue according to the sequence of the priority from high to low, and generating the N beams;
and clearing the factor of the broadcast priority corresponding to the beam which has transmitted the broadcast signal.
An embodiment of the present invention further provides a beam selection apparatus, including:
a calculating module, configured to calculate, at each TTI, priorities of α beams corresponding to α directions of a cell;
one direction corresponds to one beam, alpha beams corresponding to the alpha directions jointly cover the whole cell, and alpha is a positive integer; the priority comprises a broadcast priority or comprises a broadcast priority and a data priority; the broadcast priority is used for representing the priority of the beam required to transmit the broadcast signal; the data priority is used for representing the priority of the user data which needs to be transmitted by the beam;
the sorting module is used for sorting the priority of alpha wave beams corresponding to the alpha directions obtained by calculation to generate a priority queue;
a generating module, configured to generate N beams transmitted by the current TTI according to the priority queue; and N is the number of beams which need to be generated simultaneously by the cell.
Optionally, the priority factor of the broadcast priority is determined by at least the following parameters:
TTI, and the period of transmitting the broadcast signal.
Optionally, the calculation module includes:
a first calculation unit for calculating a broadcast priority of a beam in each direction and adding 1 to a corresponding priority factor; alternatively, the first and second electrodes may be,
and the second calculation unit is used for calculating the broadcast priority of the beam in each direction, adding 1 to the corresponding priority factor, calculating the priority of each data service corresponding to each beam, and expressing the factor of the data priority of each beam by using the priority factor of the data service with the highest priority.
Optionally, the sorting module includes:
a first sequencing unit, configured to query the broadcast priority of the beam in each direction in sequence, and if the priority factor of the broadcast priority of the beam in one direction is equal to the period for transmitting the broadcast signal, add the beam to a priority queue;
and the second sequencing unit is used for carrying out data priority sequencing on the rest wave beams and adding the rest wave beams into the priority queue according to the sequence of the data priorities.
Optionally, the generating module includes:
a beam generating unit, configured to select beams in N directions from the priority queue in order of priority from high to low, and generate the N beams;
and the factor zero-setting unit is used for zero-setting the factor of the broadcast priority corresponding to the beam which has transmitted the broadcast signal.
An embodiment of the present invention further provides a base station, where the base station includes: the beam selection apparatus described above.
Compared with the prior art, the method comprises the steps of calculating the priority of alpha wave beams corresponding to alpha directions of a cell at each transmission time interval TTI; one direction corresponds to one beam, alpha beams in the alpha directions jointly cover the whole cell, and alpha is a positive integer; the priority comprises a broadcast priority or comprises a broadcast priority and a data priority; the broadcast priority is used for representing the priority of the beam required to transmit the broadcast signal; the data priority is used for representing the priority of user data to be transmitted by the beam; sorting the priority of the alpha wave beams in the alpha directions obtained by calculation to generate a priority queue; generating N wave beams transmitted by the current TTI according to the priority queue; and N is the number of beams which need to be generated simultaneously by the cell. The embodiment of the invention combines the broadcast priority and the data priority to generate the corresponding wave beam for transmitting, the corresponding wave beam generated based on the broadcast priority can ensure that the user can smoothly access the cell, and the corresponding wave beam generated based on the data priority can provide data service for the user in time. Therefore, the embodiment of the invention improves the data throughput while ensuring the cell coverage rate.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic flow chart of a beam selection method according to an embodiment of the present invention;
fig. 2 is a first structural diagram of a beam selection apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a beam selection apparatus according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a beam selection apparatus according to a third embodiment of the present invention;
fig. 5 is a fourth schematic structural diagram of a beam selection apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
An embodiment of the present invention provides a beam selection method, as shown in fig. 1, the method includes:
step 101: calculating the priority of alpha wave beams corresponding to alpha directions of a cell at each transmission time interval TTI;
wherein, one direction corresponds to one beam, α beams in α directions jointly cover the whole cell, α is a positive integer, for example: assuming that the angle that a beam can cover is θ degrees, at least α are required for a cell, that is: 360/theta wave beams cover the whole cell; the priority comprises a broadcast priority or comprises a broadcast priority and a data priority; the broadcast priority is used for representing the priority of the beam required to transmit the broadcast signal; the data priority is used for representing the priority of user data to be transmitted by the beam;
step 102: sorting the priority levels of the alpha wave beams in the alpha directions, which are obtained by calculation, to generate a priority level queue;
step 103: generating N wave beams transmitted by the current TTI according to the priority queue; and N is the number of beams which need to be generated simultaneously by the cell.
The embodiment of the invention combines the broadcast priority and the data priority to generate the corresponding wave beam for transmitting, the corresponding wave beam generated based on the broadcast priority can ensure that the user can smoothly access the cell, and the corresponding wave beam generated based on the data priority can provide data service for the user in time. Therefore, the embodiment of the invention can ensure the coverage rate of the cell and improve the data throughput.
Wherein the priority factor of the broadcast priority is determined by at least the following parameters: TTI, and the period of transmitting the broadcast signal. For example: the priority factor may be embodied as a period of transmitting the broadcast signal, which may be β TTIs. When the beam reaches the period of transmitting the broadcast signal, it indicates that the beam must be selected.
Here, the priority factor is: a value for characterizing the priority, a larger value indicating a higher priority. As described above, the priority factor may be: 0. 1, 2, 3(TTI, i.e. 3ms corresponds to a value: 3), etc.
In this embodiment of the present invention, the calculating the priorities of α beams in α directions of a cell includes:
calculating the broadcast priority of the beam in each direction, and adding 1 to the corresponding priority factor (for example, TTI + 1); this case corresponds to the beam only needing to transmit the broadcast signal; alternatively, the first and second electrodes may be,
the broadcast priority of the beam in each direction is calculated, and the corresponding priority factor is added with 1, and the priority of each data service corresponding to each beam is calculated (for example, by using a proportional fairness algorithm), and the priority factor of the data priority of each beam is represented by the priority factor of the data service with the highest priority. This situation corresponds to the beam needing not only to transmit the broadcast signal but also to transmit user data.
Wherein the sorting the calculated priorities of the α beams in the α directions to generate a priority queue includes:
sequentially inquiring the broadcast priority of the wave beam in each direction, and if the priority factor of the broadcast priority of the wave beam in one direction is equal to the period of transmitting the broadcast signal, adding the wave beam into a priority queue;
and sequencing the data priority of the rest beams, and adding the rest beams into the priority queue according to the sequence of the data priority.
That is, the broadcast priority of each directional beam is polled first, and if the beam reaches the period (for example, beta TTIs) for transmitting broadcast signals, the beam is added into the priority queue; and for the rest beams, adding the rest beams into the priority queue according to the sequence of the data priority.
In this embodiment of the present invention, the generating N beams transmitted by the current TTI according to the priority queue includes:
selecting N directional beams from the priority queue according to the sequence of the priority from high to low, and generating the N beams;
and clearing the factor of the broadcast priority corresponding to the beam which has transmitted the broadcast signal.
Here, due to the limitation of conditions such as hardware, the cell (base station) can generate only M beams simultaneously. In order to ensure that the broadcast signal can be sent out in time, the cell (base station) needs to generate N beams simultaneously. Then M.gtoreq.N is required. Where N may be determined by the period β of the broadcast signal and the cell total α beam directions. For example: n is beta is more than or equal to alpha.
The present invention also provides an embodiment of an apparatus for implementing the method, as shown in fig. 2, the apparatus includes:
a calculating module 201, configured to calculate, at each TTI, priorities of α beams corresponding to α directions of a cell;
wherein, one direction corresponds to one beam, α beams corresponding to α directions collectively cover the whole cell, α is a positive integer, for example: assuming that the angle that a beam can cover is θ degrees, at least α cells are required for a cell, that is: 360/theta wave beams cover the whole cell; the priority comprises a broadcast priority or comprises a broadcast priority and a data priority; the broadcast priority is used for representing the priority of the beam required to transmit the broadcast signal; the data priority is used for representing the priority of the user data which needs to be transmitted by the beam;
a sorting module 202, configured to sort the priorities of the calculated α beams in the α directions, and generate a priority queue;
a generating module 203, configured to generate N beams transmitted by the current TTI according to the priority queue; and N is the number of beams which need to be generated simultaneously by the cell.
The embodiment of the invention combines the broadcast priority and the data priority to generate the corresponding wave beam for transmitting, the corresponding wave beam generated based on the broadcast priority can ensure that the user can smoothly access the cell, and the corresponding wave beam generated based on the data priority can provide data service for the user in time. Therefore, the embodiment of the invention can ensure the coverage rate of the cell and improve the data throughput.
Wherein the priority factor of the broadcast priority is determined by at least the following parameters: TTI, and the period of transmitting the broadcast signal. For example: the priority factor may be embodied as a period of transmitting the broadcast signal, which may be β TTIs. When the beam reaches the period of transmitting the broadcast signal, it indicates that the beam must be selected.
In one embodiment, as shown in fig. 3, the calculation module 201 includes:
a first calculating unit 2011, configured to calculate a broadcast priority of a beam in each direction, and add 1 to a corresponding priority factor; alternatively, the first and second electrodes may be,
the second calculating unit 2012 is configured to calculate a broadcast priority of the beam in each direction, add 1 to the corresponding priority factor, and calculate a priority of each data service corresponding to each beam, where the priority factor of the data service with the highest priority is used to represent the data priority factor of each beam.
In this embodiment of the present invention, as shown in fig. 4, the sorting module 202 includes:
a first sequencing unit 2021, configured to query the broadcast priority of the beam in each direction in sequence, and add the beam to the priority queue if the priority factor of the broadcast priority of the beam in one direction is equal to the period of transmitting the broadcast signal;
a second sorting unit 2022, configured to perform data priority sorting on the remaining beams, and add the remaining beams to the priority queue according to the order of data priorities.
In this embodiment of the present invention, as shown in fig. 5, the generating module 203 includes:
a beam generating unit 2031 configured to select beams in N directions from the priority queue in descending order of priority and generate the N beams;
a factor zeroing unit 2032 configured to zero a factor of a broadcast priority corresponding to a beam that has transmitted the broadcast signal.
Here, due to the limitation of conditions such as hardware, the cell (base station) can generate only M beams simultaneously. In order to ensure that the broadcast signal can be sent out in time, the cell (base station) needs to generate N beams simultaneously. Then M.gtoreq.N is required. Where N may be determined by the period β of the broadcast signal and the cell total α beam directions. For example: n is beta is more than or equal to alpha.
An embodiment of the present invention further provides a base station, where the base station includes: the beam selection apparatus described in fig. 2-5.
In practical applications, each unit in the beam selection apparatus according to the embodiment of the present invention may be implemented by a processor in a network element where the beam selection apparatus is located, or may be implemented by a specific logic circuit; for example, in practical applications, the beam selection apparatus may be implemented by a Central Processing Unit (CPU), a Microprocessor (MPU), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or the like located in the beam selection apparatus.
Here, it should be noted that: the descriptions of the above device embodiments are similar to the above method descriptions, and have the same beneficial effects as the method embodiments, and therefore are not repeated herein. For technical details that are not disclosed in the embodiments of the apparatus of the present invention, those skilled in the art should refer to the above-mentioned method embodiments and the following description of the specific application embodiments of the present invention to understand that, for the sake of brevity, detailed description is omitted here.
The present invention will be described in detail below with reference to specific application examples.
Example one
Within one cell, there are numerous antenna matrices, and multiple beams can be generated at the same time.
Assuming that the angle that one beam can cover is θ degrees, one cell needs at least α beams to cover the full cell, where:
if the period for transmitting the broadcast information is beta TTI, then to complete the broadcast in the whole cell, one cell at least needs to generate M beams simultaneously, so the number N of beams that can be generated simultaneously by the cell needs to be less than or equal to M, and it can be seen that the beams for transmitting the broadcast signal can be scheduled, wherein,
here, for example, the above expression is described, assuming that at least 10(α) beams are needed to cover the whole cell, the period of the broadcast information is 10(β) TTIs (1ms), that is: 10 ms. Therefore, in order to ensure that the user can access the cell smoothly, only 1(M) beams are needed in one TTI (1 ms).
Then, for each direction of beam, two priorities are calculated separately:
broadcast priority: indicating the priority of the beam required to transmit the broadcast signal, the broadcast priority factor may be 1 added to each TTI, and when the broadcast priority factor is equal to β, it indicates that the beam must be scheduled (selected), and the beam transmits the broadcast signal. After scheduling, broadcast priority factor 0.
Data priority: the priority of the user data required to be transmitted by the beam is represented, the data priority factor can be calculated according to a proportional fairness algorithm, and the data priority factor can be replaced by the priority factor of the service with the highest priority when the beam has multiple users and multiple services.
The concrete steps of selecting beam for each TTI are as follows:
the first step is as follows: calculate the priority of each beam:
calculating the broadcast priority of each beam, and adding 1 to the broadcast priority factor of each beam;
if the beam has user access and the user has data transmission, calculating the priority of each service according to a proportional fair algorithm, and replacing the data priority factor of the beam with the priority factor of the service with the highest priority;
the second step is that: carrying out priority sequencing to generate a priority queue:
polling the broadcast priority of the beam, and adding the beam to the priority queue when the broadcast priority factor of the beam is equal to beta;
and sequencing the data priority of the rest beams and adding the data priority into a priority queue.
The third step: and selecting a priority queue, selecting N beam directions with the highest priority according to the priority queue, generating beams, and clearing the broadcast priority factor of the selected beams.
Example two
Within one cell, there are numerous antenna matrices, and multiple beams can be generated.
Assuming that one beam can cover an angle θ degrees, then a cell needs at least α beams to cover the full cell, where:
it is assumed that there are two kinds of signals, broadcast signal 1 and broadcast signal 2.
If the period for transmitting the broadcast information 1 is β 1 TTIs, the period for transmitting the broadcast information 2 is β 2 TTIs, and β 1< β 2, then to complete the broadcast in the whole cell, one cell at least needs to generate M beams simultaneously, so the number N of beams that can be generated by the cell simultaneously needs to be less than or equal to M, and it is visible that the beams for transmitting the broadcast signal must be scheduled, where:
then, for each direction of beam, two types of priorities are calculated, respectively:
broadcast priority: the broadcast priorities of the two broadcast signals need to be calculated separately. The broadcast priority factor 1 corresponding to the broadcast signal 1 is 1 added to each TTI, and when the broadcast priority factor 1 is equal to β 1, it indicates that the beam must be scheduled (selected), and the broadcast signal 1 is transmitted; broadcast priority factor 2 for broadcast signal 2 is 1 added to each TTI, and when broadcast priority factor 2 equals β 2, it means that the beam must be scheduled to transmit broadcast signal 2. After the broadcast signal is transmitted, the corresponding broadcast priority factor is cleared to 0.
Data priority: the data priority factor can be calculated according to a proportional fairness algorithm, and for the condition that multiple users and multiple services exist on the beam, the data priority factor is replaced by the priority factor of the service with the highest priority.
The concrete steps of selecting beam for each TTI are as follows:
the first step is as follows: calculate the priority of each beam:
calculating the broadcast priority of each beam, and adding 1 to the two broadcast priority factors of each beam;
if the beam has user access and the user has data transmission, calculating the priority of each service according to a proportional fairness algorithm, and replacing the data priority factor of the beam with the priority factor of the service with the highest priority;
the second step is that: carrying out priority sequencing to generate a priority queue:
polling the broadcast priority of the beam, and adding the beam to the priority queue when the broadcast priority factor 1 is equal to beta 1 or the broadcast priority factor 2 is equal to beta 2;
and sequencing the data priority of the rest beams and adding the data priority into a priority queue.
The third step: and selecting the priority queue, and selecting N beam directions with the highest priority according to the priority queue to generate beams. And clears the corresponding broadcast priority factor of the selected broadcast signal.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (11)
1. A method for beam selection, the method comprising:
calculating the priority of alpha wave beams corresponding to alpha directions of a cell at each transmission time interval TTI;
wherein, one direction corresponds to one beam, all beams in the α directions cover the whole cell together, and α is a positive integer; the priority comprises a broadcast priority or comprises a broadcast priority and a data priority; the broadcast priority is used for representing the priority of the beam required to transmit the broadcast signal; the data priority is used for representing the priority of user data to be transmitted by the beam;
sorting the priority levels of the alpha wave beams in the alpha directions, which are obtained by calculation, to generate a priority level queue;
generating N wave beams transmitted by the current TTI according to the priority queue; and N is the number of beams which need to be generated simultaneously by the cell.
2. The beam selection method of claim 1 wherein the priority factor of the broadcast priority is determined by at least the following parameters:
TTI, and the period of transmitting the broadcast signal.
3. The method of claim 1 or 2, wherein the calculating the priority of the α beams in the α directions of the cell comprises:
calculating the broadcast priority of the beam in each direction, and adding 1 to the corresponding priority factor; alternatively, the first and second electrodes may be,
and calculating the broadcast priority of the beam in each direction, adding 1 to the corresponding priority factor, calculating the priority of each data service corresponding to each beam, and expressing the data priority factor of each beam by using the priority factor of the data service with the highest priority.
4. The method according to claim 1 or 2, wherein the sorting the priorities of the calculated α beams in α directions to generate a priority queue comprises:
sequentially inquiring the broadcast priority of the wave beam in each direction, and if the priority factor of the broadcast priority of the wave beam in one direction is equal to the period of transmitting the broadcast signal, adding the wave beam into a priority queue;
and sequencing the data priority of the rest beams, and adding the rest beams into the priority queue according to the sequence of the data priority.
5. The method of claim 1 or 2, wherein the generating N beams for the current TTI transmission according to the priority queue comprises:
selecting N directional beams from the priority queue according to the sequence of the priority from high to low, and generating the N beams;
and clearing the factor of the broadcast priority corresponding to the beam which has transmitted the broadcast signal.
6. A beam selection apparatus, comprising:
a calculating module, configured to calculate, at each TTI, priorities of α beams corresponding to α directions of a cell;
one direction corresponds to one beam, alpha beams corresponding to the alpha directions jointly cover the whole cell, and alpha is a positive integer; the priority comprises a broadcast priority or comprises a broadcast priority and a data priority; the broadcast priority is used for representing the priority of the beam required to transmit the broadcast signal; the data priority is used for representing the priority of user data to be transmitted by the beam;
the sorting module is used for sorting the priority of alpha wave beams corresponding to the alpha directions obtained by calculation to generate a priority queue;
a generating module, configured to generate N beams transmitted by the current TTI according to the priority queue; and N is the number of beams which need to be generated simultaneously by the cell.
7. The beam selection apparatus of claim 6 wherein the priority factor of the broadcast priority is determined by at least the following parameters:
TTI, and the period of transmitting the broadcast signal.
8. The beam selection apparatus of claim 6 or 7, wherein the calculation module comprises:
a first calculation unit for calculating a broadcast priority of a beam in each direction and adding 1 to a corresponding priority factor; alternatively, the first and second electrodes may be,
a second calculating unit, configured to calculate a broadcast priority of a beam in each direction, add 1 to a corresponding priority factor, and calculate a priority of each data service corresponding to each beam, where a priority factor of the data priority of each beam is represented by a priority factor of a data service with a highest priority.
9. The beam selection apparatus of claim 6 or 7, wherein the sorting module comprises:
a first sequencing unit, configured to query the broadcast priority of the beam in each direction in sequence, and if the priority factor of the broadcast priority of the beam in one direction is equal to the period for transmitting the broadcast signal, add the beam to a priority queue;
and the second sequencing unit is used for carrying out data priority sequencing on the rest wave beams and adding the rest wave beams into the priority queue according to the sequence of the data priorities.
10. The beam selection apparatus of claim 6 or 7, wherein the generating module comprises:
a beam generating unit, configured to select beams in N directions from the priority queue in order of priority from high to low, and generate the N beams;
and the factor zero-setting unit is used for zero-setting the factor of the broadcast priority corresponding to the beam which has transmitted the broadcast signal.
11. A base station, characterized in that the base station comprises: the beam selection apparatus of any one of claims 6-10.
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