CN108366376B - Beam scanning method and base station - Google Patents
Beam scanning method and base station Download PDFInfo
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- CN108366376B CN108366376B CN201710057533.7A CN201710057533A CN108366376B CN 108366376 B CN108366376 B CN 108366376B CN 201710057533 A CN201710057533 A CN 201710057533A CN 108366376 B CN108366376 B CN 108366376B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/18—Network planning tools
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
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Abstract
The embodiment of the invention provides a beam scanning method and a base station, wherein the method comprises the following steps: selecting at least one analog beam pattern from a plurality of analog beam patterns; encapsulating indication information of the selected at least one analog beam pattern in beam pattern indication signaling; beamforming the selected at least one analog beam pattern according to the beam pattern indication signaling; scanning is performed using the beamformed beam. The scheme of the invention can enable the base station to simultaneously transmit a plurality of wave beams for wave beam scanning and simultaneously access a plurality of terminals.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a beam scanning method and a base station.
Background
In the current 3GPP standardization process, in order to ensure a large network coverage, beamforming by a control channel is a very potential way. Therefore, during the initial access process, an initial beam alignment operation is required between the user and the base station. One possible beam alignment approach is a beam scanning (beam surfing) operation. The base station end and the user end traverse all TX-RX beam pairs by transmitting reference signals, thereby selecting the optimal beam pair from the TX-RX beam pairs and carrying out specific data communication;
in the beam scanning mode, a large number of beam pair traversals are required. For example: for a system with 32 equal-width beams at the base station end and 4 equal-width beams at the user end, 128 times of scanning of beam pairs are required to confirm the optimal beam pair, which greatly increases the initial access time. Especially in high frequency communication systems, the frequency of initial access in the communication system is greatly increased due to the high frequency channels being subject to blocking.
Beamforming of control channels, which is essential to extend the coverage of control channels: if the control channel is transmitted in a narrower beam, the coverage area is large, but the beam searching time is long; the control channel is transmitted in a wider beam, the coverage is large, but the beam search time is short.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method and a base station for beam scanning, wherein the base station performs beam scanning by simultaneously transmitting beams with various widths, and can simultaneously access multiple terminals.
In order to solve the technical problems, the scheme of the invention is as follows:
a method of beam scanning, comprising:
selecting at least one analog beam pattern from a plurality of analog beam patterns;
encapsulating indication information of the selected at least one analog beam pattern in beam pattern indication signaling;
beamforming the selected at least one analog beam pattern according to the beam pattern indication signaling;
scanning is performed using the beamformed beam.
Wherein selecting at least one analog beam pattern from the plurality of analog beam patterns comprises:
selecting at least one analog beam pattern from the plurality of analog beam patterns according to the current network load information and/or the current terminal distribution information.
Wherein the step of encapsulating the indication information of the selected at least one analog beam pattern in beam pattern indication signaling comprises:
acquiring position information of the selected at least one analog beam pattern;
and encapsulating the position information corresponding to the at least one analog beam pattern and the at least one analog beam pattern in a beam pattern indication signaling.
Wherein the step of encapsulating the at least one analog beam pattern and the position information corresponding to the at least one analog beam pattern in the beam pattern indication signaling comprises:
if the number of the at least one analog beam pattern is N and the beam pattern indication signaling is N fields, sequentially and respectively encapsulating each analog beam pattern of the N analog beam patterns and the position information of the analog beam pattern in one field of the beam pattern indication signaling, wherein the rotation direction of the at least one analog beam pattern is a first default value and the rotation angle is a second default value; where N is a positive integer.
Wherein the first default value is clockwise or counterclockwise; the second default value is a coverage angle corresponding to a beam with the smallest beam coverage angle in each analog beam pattern.
Wherein the step of encapsulating the at least one analog beam pattern and the position information corresponding to the at least one analog beam pattern in the beam pattern indication signaling comprises:
if the number of the at least one analog beam pattern is N and the beam pattern indication signaling is N +1 fields, sequentially and respectively encapsulating each analog beam pattern of the N analog beam patterns and the position information of the analog beam pattern in one field of the beam pattern indication signaling, and encapsulating the rotation direction and the rotation angle of the scanning of the at least one analog beam pattern in the N +1 field of the beam pattern indication signaling, wherein N is a positive integer.
Wherein, the beam scanning method further comprises: and constructing beam codebook indication information, and encapsulating the beam information of the at least one analog beam pattern in the beam codebook indication information.
Wherein the beam information of the analog beam pattern comprises: beam width and power strength.
Wherein, the step of scanning by using the beam after beam forming comprises:
and according to the rotation direction and the rotation angle of the scanning of the at least one analog beam pattern, performing periodic rotation scanning by using the beam after beam forming.
Wherein the at least one analog beam pattern comprises: an analog beam pattern of equal width or an analog beam pattern of unequal width.
An embodiment of the present invention further provides a base station, including:
a beam selection module for selecting at least one analog beam pattern from a plurality of analog beam patterns;
an encapsulating module, configured to encapsulate indication information of the selected at least one analog beam pattern in a beam pattern indication signaling;
a beam forming module, configured to perform beam forming on the selected at least one analog beam pattern according to the beam pattern indication signaling;
and the scanning module is used for scanning by using the beam after the beam forming.
The beam selection module is specifically configured to select at least one analog beam pattern from a plurality of analog beam patterns according to current network load information and/or current terminal distribution information.
The encapsulation module is specifically configured to obtain position information of the selected at least one analog beam pattern; and encapsulating the position information corresponding to the at least one analog beam pattern and the at least one analog beam pattern in a beam pattern indication signaling.
Wherein the encapsulation module includes: a first encapsulating unit, configured to, when the at least one analog beam pattern is N, and the beam pattern indication signaling is N fields, sequentially and respectively encapsulate each analog beam pattern of the N analog beam patterns and position information of the analog beam pattern in one field of the beam pattern indication signaling, where a rotation direction of the at least one analog beam pattern is a first default value, and a rotation angle is a second default value; where N is a positive integer.
The first default value is clockwise or counterclockwise, and the second default value is a coverage angle corresponding to a beam with the smallest beam coverage angle in each analog beam pattern.
Wherein the encapsulation module includes: a second encapsulating unit, configured to encapsulate, in a field of the beam pattern indication signaling, each analog beam pattern of the N analog beam patterns and position information of the analog beam pattern, in sequence and respectively, when the at least one analog beam pattern is N, where the beam pattern indication signaling is N +1 fields, encapsulate a rotation direction and a rotation angle of scanning of the at least one analog beam pattern in an N +1 th field in the beam pattern indication signaling, where N is a positive integer.
Wherein, the base station still includes: and the codebook construction module is used for constructing beam codebook indication information and encapsulating the beam information of the at least one analog beam pattern in the beam codebook indication information.
Wherein the beam information of the analog beam pattern comprises: beam width and power strength.
Wherein the scanning module is specifically configured to: and according to the rotation direction and the rotation angle of the scanning of the at least one analog beam pattern, performing periodic rotation scanning by using the beam after beam forming.
Wherein the at least one analog beam pattern comprises: an analog beam pattern of equal width or an analog beam pattern of unequal width.
The scheme of the invention at least comprises the following beneficial effects:
the above aspect of the present invention is achieved by selecting at least one analog beam pattern from a plurality of analog beam patterns; encapsulating indication information of the selected at least one analog beam pattern in beam pattern indication signaling; beamforming the selected at least one analog beam pattern according to the beam pattern indication signaling; scanning is performed using the beamformed beam. Therefore, the base station can simultaneously transmit a plurality of beams to scan the beams and can simultaneously access a plurality of terminals.
Drawings
Fig. 1 is a communication flow diagram of a terminal initially accessing a data communication phase;
FIG. 2 is a flow chart of a beam scanning method according to an embodiment of the present invention;
FIG. 3 is a first format diagram of beam pattern indication signaling in the beam scanning method of the present invention;
FIG. 4 is a second format diagram of beam pattern indication signaling in the beam scanning method of the present invention;
FIG. 5 is a schematic view of a plurality of equal width beams being scanned;
FIG. 6 is a schematic diagram of scanning with a plurality of beams of unequal widths;
fig. 7 is a schematic block diagram of a base station according to the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As shown in fig. 1, in 5G communication, the overall process of the terminal initially accessing to the data communication phase includes: step 1, simulating beam collection; step 2, semi-dynamic SRS (sounding reference signal) configuration and SRS transmission; step 3, CSI-RS (channel state information-reference signal) transmission and CSI feedback; and 4, data transmission.
In the initial access phase of step 1 of the above procedure, as shown in fig. 2, a beam scanning method at the base station side includes:
preferably, the base station may select at least one analog beam pattern from the plurality of analog beam patterns according to current network load information and/or current terminal distribution information.
And step 123, performing beamforming on the selected at least one analog beam pattern according to the beam pattern indication signaling.
The above-described embodiments of the present invention are achieved by selecting at least one analog beam pattern from a plurality of analog beam patterns; encapsulating indication information of the selected at least one analog beam pattern in beam pattern indication signaling; beamforming the selected at least one analog beam pattern according to the beam pattern indication signaling; scanning is performed using the beamformed beam. Therefore, the base station can simultaneously transmit a plurality of beams to perform beam scanning and can simultaneously access a plurality of terminals.
A second embodiment of the present invention provides a beam scanning method, including:
step 211, selecting at least one analog beam pattern from a plurality of analog beam patterns;
preferably, the base station may select at least one analog beam pattern from the plurality of analog beam patterns according to current network load information and/or current terminal distribution information.
Step 221, obtaining position information of the selected at least one analog beam pattern; the position information here may be arrangement order information of at least one analog beam pattern when the beam patterns are arranged in order, such as sequence number information.
Step 222, encapsulating the at least one analog beam pattern and the position information corresponding to the at least one analog beam pattern in a beam pattern indication signaling.
Step 223, performing beamforming on the selected at least one analog beam pattern according to the beam pattern indication signaling.
Step 224, scanning is performed using the beamformed beam.
A second embodiment of the present invention, by selecting at least one analog beam pattern from a plurality of analog beam patterns; encapsulating the at least one analog beam pattern and the position information corresponding to the at least one analog beam pattern in a beam pattern indication signaling; beamforming the selected at least one analog beam pattern according to the beam pattern indication signaling; scanning is performed using the beamformed beam. Therefore, the base station can simultaneously transmit a plurality of beams to scan the beams and can simultaneously access a plurality of terminals.
A third embodiment of the present invention provides a beam scanning method, including:
step 311, selecting at least one analog beam pattern from a plurality of analog beam patterns;
preferably, the base station may select at least one analog beam pattern from the plurality of analog beam patterns according to current network load information and/or current terminal distribution information.
Step 321, obtaining position information of the selected at least one analog beam pattern; the position information here may be arrangement order information of at least one analog beam pattern when the beam patterns are arranged in order, such as sequence number information.
Step 322, if the number of the at least one analog BEAM PATTERN is N and the BEAM PATTERN indication signaling is N fields, sequentially and respectively encapsulating each analog BEAM PATTERN of the N analog BEAM PATTERNs and the position information of the analog BEAM PATTERN in one field of the BEAM PATTERN indication signaling (BEAM-PATTERN-INDEX), where the rotation direction of the at least one analog BEAM PATTERN is a first default value and the rotation angle is a second default value; where N is a positive integer.
The first default value is clockwise or counterclockwise, and the second default value is a coverage angle corresponding to a beam with the smallest beam coverage angle in each analog beam pattern.
The structure of the beam pattern indication signaling is shown in fig. 3, and if one field in the beam pattern indication signaling of N fields is empty, N-1 beams are used for scanning.
Step 323, performing beamforming on the selected at least one analog beam pattern according to the beam pattern indication signaling.
In step 324, the beamformed beam is used for scanning.
In the embodiment of the present invention, through the indication signaling of the N fields, the base station can simultaneously scan with N beams according to the default rotation direction and the default rotation angle.
A fourth embodiment of the present invention provides a beam scanning method, including:
step 411, selecting at least one analog beam pattern from a plurality of analog beam patterns;
preferably, the base station may select at least one analog beam pattern from the plurality of analog beam patterns according to current network load information and/or current terminal distribution information.
Step 421, obtaining position information of the selected at least one analog beam pattern; the position information here may be arrangement order information of at least one analog beam pattern when the beam patterns are arranged in order, such as sequence number information.
Step 422, if the number of the at least one analog beam pattern is N and the beam pattern indication signaling is (N +1) fields, sequentially and respectively encapsulating each analog beam pattern of the N analog beam patterns and the position information of the analog beam pattern in one field of the beam pattern indication signaling, and encapsulating the rotation direction and the rotation angle of the scanning of the at least one analog beam pattern in the (N +1) th field of the beam pattern indication signaling, where N is a positive integer. The structure of the beam pattern indication signaling is shown in fig. 4.
Step 423, performing beamforming on the selected at least one analog beam pattern according to the beam pattern indication signaling.
Step 424, scanning is performed using the beamformed beam.
In this embodiment of the present invention, through the indication signaling of the (N +1) th field, the base station may simultaneously scan with N beams according to the rotation direction and the rotation angle set in the (N +1) th field.
In the above embodiments of the present invention, the beam scanning method further includes: and constructing beam codebook indication information, and encapsulating the beam information of the at least one analog beam pattern in the beam codebook indication information. The beam information of the analog beam pattern includes: beam width and power strength.
In the above embodiment of the present invention, the step of scanning with the beam after beam forming may specifically include: and according to the rotation direction and the rotation angle of the scanning of the at least one analog beam pattern, performing periodic rotation scanning by using the beam after beam forming.
Wherein the at least one analog beam pattern comprises: at least one analog beam pattern of equal width (as shown in fig. 5) or at least one analog beam pattern of unequal width (as shown in fig. 6). Therefore, the base station can simultaneously transmit various beams with the same width for scanning, and can also simultaneously transmit various beams with different widths for scanning.
In the above embodiments of the present invention, a BEAM-PATTERN indication (BEAM-PATTERN indication) signaling is added, and the signaling may include N +1 fields or N fields, including PATTERNs and location information corresponding to N BEAMs, where the parameter N indicates the maximum number of BEAMs in a multi-BEAM scanning, and if a field is empty, it indicates that (N-1) BEAMs are used for scanning, and so on.
Wherein, under (N +1) field, the last field represents the rotation direction and angle of beam scanning; under the N fields, the rotation direction of the beam scanning is defaulted to be clockwise or counterclockwise (preset), and the beam scanning angle is defaulted to be the coverage angle corresponding to the beam with the minimum beam coverage angle in each single beam. The single beam pattern information includes beam width, power strength, etc., and may be indicated by a pre-constructed beam codebook.
The embodiment of the invention adopts a mode of periodically scanning beams with various widths, so that the initialization access of a high-frequency communication system is more reasonably carried out; the method mainly enables the user terminal to access, but not select the optimal beam for access, and multiple terminals access simultaneously. Therefore, in the subsequent communication process, the user terminal can further update the beam on the basis of the current beam, and selects the beam with the greater signal strength for communication, thereby dynamically optimizing the beam. Since the terminal is accessed at this time, the terminal end and the base station end can carry out effective information interaction and then carry out fine beam scanning, and the efficiency of the method is greatly improved.
As shown in fig. 7, an embodiment of the present invention further provides a base station 700, including:
a beam selection module 711 for selecting at least one analog beam pattern from a plurality of analog beam patterns;
an encapsulating module 712, configured to encapsulate the indication information of the selected at least one analog beam pattern in beam pattern indication signaling;
a beamforming module 713, configured to perform beamforming on the selected at least one analog beam pattern according to the beam pattern indication signaling;
a scanning module 714, configured to scan with the beamformed beam.
The beam selection module 711 is specifically configured to select at least one analog beam pattern from a plurality of analog beam patterns according to current network load information and/or current terminal distribution information.
The encapsulating module 712 is specifically configured to obtain location information of the selected at least one analog beam pattern; and encapsulating the position information corresponding to the at least one analog beam pattern and the at least one analog beam pattern in a beam pattern indication signaling.
Wherein the encapsulation module 712 includes: a first encapsulating unit, configured to, when the at least one analog beam pattern is N, and the beam pattern indication signaling is N fields, sequentially and respectively encapsulate each analog beam pattern of the N analog beam patterns and position information of the analog beam pattern in one field of the beam pattern indication signaling, where a rotation direction of the at least one analog beam pattern is a first default value, and a rotation angle is a second default value; where N is a positive integer.
Wherein the first default value is clockwise or counterclockwise; the second default value is a coverage angle corresponding to a beam with the smallest beam coverage angle in each analog beam pattern.
Wherein the encapsulation module 712 includes: a second encapsulating unit, configured to encapsulate, in a field of the beam pattern indication signaling, each analog beam pattern of the N analog beam patterns and position information of the analog beam pattern, in sequence and respectively, when the at least one analog beam pattern is N, where the beam pattern indication signaling is N +1 fields, encapsulate a rotation direction and a rotation angle of scanning of the at least one analog beam pattern in an N +1 th field in the beam pattern indication signaling, where N is a positive integer.
Wherein, the base station still includes: and the codebook construction module is used for constructing beam codebook indication information and encapsulating the beam information of the at least one analog beam pattern in the beam codebook indication information.
Wherein the beam information of the analog beam pattern comprises: beam width and power strength.
Wherein the scanning module is specifically configured to: and according to the rotation direction and the rotation angle of the scanning of the at least one analog beam pattern, performing periodic rotation scanning by using the beam after beam forming.
Wherein the at least one analog beam pattern comprises: an analog beam pattern of equal width or an analog beam pattern of unequal width.
In the above embodiment of the present invention, the beam selection module of the base station selects an appropriate analog beam pattern according to the current network load information, the known current user distribution information, and other basic information;
the packaging module packages the indication information corresponding to the selected BEAM PATTERN into BEAM PATTERN indication signaling (BEAM-PATTERN-INDEX signaling);
the beam selection module passes the beam pattern indication signaling to the beamforming module;
the beam forming module carries out beam forming according to the beam pattern indication signaling, and carries out periodic rotation according to a certain rotation angle, and the scanning module carries out beam scanning;
the base station of the invention is a base station corresponding to the method embodiment, all the implementation manners in the method embodiment are applicable to the embodiment of the base station, and the base station also adopts a mode of periodically scanning beams with various widths, so that the initialization access of a high-frequency communication system is more reasonably carried out; the method mainly enables the terminal to be accessed, and the terminal does not select the optimal beam to be accessed, and multiple terminals are accessed simultaneously.
Therefore, in the subsequent communication process, the terminal can further update the beam on the basis of the current beam, and selects the beam with higher signal strength for communication, thereby dynamically optimizing the beam. Because the access is already carried out at this moment, the terminal end and the base station end can carry out effective information interaction and then carry out fine beam scanning, and the efficiency of the method is greatly improved.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (16)
1. A method of beam scanning, comprising:
selecting at least one analog beam pattern from a plurality of analog beam patterns;
encapsulating the indication information of the selected at least one analog beam pattern in beam pattern indication signaling, comprising: acquiring position information of the selected at least one analog beam pattern; encapsulating the position information corresponding to the at least one analog beam pattern and the at least one analog beam pattern in a beam pattern indication signaling, wherein if the at least one analog beam pattern is N, and the beam pattern indication signaling is N fields, each analog beam pattern of the N analog beam patterns and the position information of the analog beam pattern are sequentially and respectively encapsulated in one field of the beam pattern indication signaling, the rotation direction of the at least one analog beam pattern is a first default value, and the rotation angle is a second default value; wherein N is a positive integer;
beamforming the selected at least one analog beam pattern according to the beam pattern indication signaling;
scanning by using the beam formed by the beam forming;
the at least one analog beam pattern comprises: an analog beam pattern of equal width or an analog beam pattern of unequal width.
2. The beam scanning method of claim 1, wherein the step of selecting at least one analog beam pattern from a plurality of analog beam patterns comprises:
selecting at least one analog beam pattern from the plurality of analog beam patterns according to the current network load information and/or the current terminal distribution information.
3. The beam scanning method of claim 1, wherein the at least one analog beam pattern comprises: an analog beam pattern of equal width or an analog beam pattern of unequal width.
4. The beam scanning method of claim 1, wherein the first default value is clockwise or counterclockwise; the second default value is a coverage angle corresponding to a beam with the smallest beam coverage angle in each analog beam pattern.
5. The method of claim 1, wherein the step of encapsulating the position information corresponding to the at least one analog beam pattern and the at least one analog beam pattern in beam pattern indication signaling comprises:
if the number of the at least one analog beam pattern is N and the beam pattern indication signaling is N +1 fields, sequentially and respectively encapsulating each analog beam pattern of the N analog beam patterns and the position information of the analog beam pattern in one field of the beam pattern indication signaling, and encapsulating the rotation direction and the rotation angle of the scanning of the at least one analog beam pattern in the N +1 field of the beam pattern indication signaling, wherein N is a positive integer.
6. The beam scanning method of claim 1, further comprising:
and constructing beam codebook indication information, and encapsulating the beam information of the at least one analog beam pattern in the beam codebook indication information.
7. The beam scanning method of claim 6, wherein the beam information of the analog beam pattern comprises: beam width and power strength.
8. The beam scanning method of claim 1 or claim 5, wherein the step of scanning with the beamformed beam comprises:
and according to the rotation direction and the rotation angle of the scanning of the at least one analog beam pattern, performing periodic rotation scanning by using the beam after beam forming.
9. A base station, comprising:
a beam selection module for selecting at least one analog beam pattern from a plurality of analog beam patterns;
an encapsulating module, configured to encapsulate indication information of the selected at least one analog beam pattern in a beam pattern indication signaling;
a beam forming module, configured to perform beam forming on the selected at least one analog beam pattern according to the beam pattern indication signaling;
the scanning module is used for scanning by utilizing the beam after beam forming;
the encapsulation module is specifically configured to obtain position information of the selected at least one analog beam pattern; encapsulating the at least one analog beam pattern and the position information corresponding to the at least one analog beam pattern in a beam pattern indication signaling;
the package module includes: a first encapsulating unit, configured to, when the at least one analog beam pattern is N, and the beam pattern indication signaling is N fields, sequentially and respectively encapsulate each analog beam pattern of the N analog beam patterns and position information of the analog beam pattern in one field of the beam pattern indication signaling, where a rotation direction of the at least one analog beam pattern is a first default value, and a rotation angle is a second default value; wherein N is a positive integer.
10. The base station according to claim 9, wherein the beam selection module is specifically configured to select at least one analog beam pattern from a plurality of analog beam patterns according to current network load information and/or current terminal distribution information.
11. The base station of claim 9, wherein the at least one analog beam pattern comprises: an analog beam pattern of equal width or an analog beam pattern of unequal width.
12. The base station of claim 9, wherein the first default value is clockwise or counterclockwise; the second default value is a coverage angle corresponding to a beam with the smallest beam coverage angle in each analog beam pattern.
13. The base station of claim 9, wherein the encapsulation module comprises:
a second encapsulating unit, configured to encapsulate, in a field of the beam pattern indication signaling, each analog beam pattern of the N analog beam patterns and position information of the analog beam pattern, in sequence and respectively, when the at least one analog beam pattern is N, where the beam pattern indication signaling is N +1 fields, encapsulate a rotation direction and a rotation angle of scanning of the at least one analog beam pattern in an N +1 th field in the beam pattern indication signaling, where N is a positive integer.
14. The base station of claim 9, further comprising:
and the codebook construction module is used for constructing beam codebook indication information and encapsulating the beam information of the at least one analog beam pattern in the beam codebook indication information.
15. The base station of claim 14, wherein the beam information of the analog beam pattern comprises: beam width and power strength.
16. The base station of claim 9 or claim 13, wherein the scanning module is specifically configured to: and according to the rotation direction and the rotation angle of the scanning of the at least one analog beam pattern, performing periodic rotation scanning by using the beam after beam forming.
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