CN109831795B - Method and device for sending random access leader sequence - Google Patents
Method and device for sending random access leader sequence Download PDFInfo
- Publication number
- CN109831795B CN109831795B CN201711184367.3A CN201711184367A CN109831795B CN 109831795 B CN109831795 B CN 109831795B CN 201711184367 A CN201711184367 A CN 201711184367A CN 109831795 B CN109831795 B CN 109831795B
- Authority
- CN
- China
- Prior art keywords
- random access
- preamble sequence
- access preamble
- candidate
- determining
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 47
- 230000005540 biological transmission Effects 0.000 claims abstract description 84
- 230000004044 response Effects 0.000 claims description 17
- 238000010586 diagram Methods 0.000 description 10
- 238000004891 communication Methods 0.000 description 8
- 230000006870 function Effects 0.000 description 5
- 238000004590 computer program Methods 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 3
- 238000010295 mobile communication Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The application shows a method and a device for sending a random access leader sequence. In the application, since the width of the transmission beam corresponding to the target reception beam is greater than any one narrow beam, and therefore, the coverage area of the transmission beam corresponding to the target reception beam is greater than the coverage area of any one narrow beam, compared with the case that the transmission beam corresponding to the target reception beam is used for transmitting the random access preamble sequence, the use of the narrow beam for transmitting the random access preamble sequence can improve signal gain, so that the transmission power of the random access preamble sequence transmitted by the current device can be indirectly improved, and further, the signal quality of the random access preamble sequence transmitted by the current device and received by the gNB can be improved.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for sending a random access preamble sequence.
Background
Currently, New Radio (NR) systems typically utilize millimeter waves to transmit information in the high frequency band greater than 6 GHz. Millimeter waves have shorter wavelengths and are easy to beam-form, so that multiple beams are generally used for transmitting and receiving information between a User Equipment (UE) and an NR base station (NR Node B, gNB). Before receiving and sending information, the UE needs to establish an uplink channel with the gNB through a random access procedure.
In the random access process, the UE transmits a random access preamble sequence by using a transmitting wave beam thereof; after receiving the random access preamble sequence, the gNB returns a random access response according to the random access preamble sequence, and then the UE receives the random access response returned by the gNB. If the sending power of the UE sending the random access preamble sequence is small, the gNB may not receive the random access preamble sequence, and the UE may not establish an uplink channel with the gNB.
Therefore, in order to ensure that an uplink channel between the UE and the gNB can be established, if the random access response returned by the gNB is not received within the preset time period after the random access preamble sequence is sent, the UE raises the transmission power and sends the random access preamble sequence again, and if the random access response returned by the gNB is not received within the preset time period, the UE continues to raise the transmission power and sends the random access preamble sequence again until the random access response returned by the gNB is received. And the difference between the sending powers of the UE sending the random access preamble sequence twice is the power lifting step length with fixed size.
In order to reduce mutual interference between UEs due to excessive power, the power ramping step size is usually limited within a certain range. When the transmission power of the UE for sending the random access preamble sequence for the first time is low and the gNB cannot receive the random access preamble sequence, if the transmission power of the random access preamble sequence that the gNB can receive is to be achieved, the transmission power needs to be raised many times, that is, the UE needs to continuously send the random access preamble sequence many times, so that the UE needs to spend a long time to receive the random access response returned by the gNB, which causes a long access delay and a low efficiency of establishing an uplink channel with the gNB.
Disclosure of Invention
The application shows a method and a device for sending a random access leader sequence, so as to reduce random access time delay.
In a first aspect, the present application shows a method for sending a random access preamble sequence, where the method includes: determining whether the current device is a beam edge device based on the signal quality of the target receive beam; if the current device is the beam edge device, splitting a transmitting beam corresponding to the target receiving beam to obtain at least one narrow beam, wherein the width of each narrow beam is smaller than that of the transmitting beam; transmitting a random access preamble sequence using the at least one narrow beam.
In the application, since the width of the transmission beam corresponding to the target reception beam is greater than any one narrow beam, and therefore, the coverage area of the transmission beam corresponding to the target reception beam is greater than the coverage area of any one narrow beam, compared with the case that the transmission beam corresponding to the target reception beam is used for transmitting the random access preamble sequence, the use of the narrow beam for transmitting the random access preamble sequence can improve signal gain, so that the transmission power of the random access preamble sequence transmitted by the current device can be indirectly improved, and further, the signal quality of the random access preamble sequence transmitted by the current device and received by the gNB can be improved.
In an optional implementation, the method further includes: receiving a plurality of signals on a plurality of candidate receive beams; determining signal qualities of the plurality of candidate receive beams based on the plurality of signals; determining the target receive beam among the plurality of candidate receive beams based on signal qualities of the plurality of candidate receive beams.
In order to reduce the collision probability and further reduce the random access delay, in an optional implementation manner, the method further includes: determining whether the current device is a multi-beam coverage device; determining the target receive beam among the plurality of candidate receive beams based on the signal qualities of the plurality of candidate receive beams if the current device is the multi-beam overlay device, comprising: acquiring the reference signal receiving quality and the signal to interference plus noise ratio (SINR) of each candidate receiving beam; determining a candidate receiving beam with the best reference signal receiving quality in a plurality of candidate receiving beams; searching for at least one candidate receiving beam with a difference value smaller than a preset threshold value with respect to the reference signal receiving quality of the candidate receiving beam with the best reference signal receiving quality in the remaining candidate receiving beams; among the at least one candidate receiving beam, the candidate receiving beam with the largest SINR is determined as the target receiving beam.
In an alternative implementation, the reference signal reception quality includes at least one of: reference signal received quality, RSRQ, and reference signal received power, RSRP.
In an alternative implementation, the at least one narrow beam is a plurality of narrow beams; the transmitting a random access preamble sequence using the at least one narrow beam includes: transmitting the random access preamble sequence using one of the plurality of narrow beams.
In order to enable the gNB to receive the random access preamble sequence as soon as possible and further reduce the access delay, in an optional implementation, the sending the random access preamble sequence using one of the narrow beams includes: determining a deviation between an exit angle of each of the plurality of narrow beams and an exit angle of a transmit beam corresponding to the target receive beam to obtain a deviation corresponding to the plurality of narrow beams; transmitting the random access preamble sequence using a narrow beam with a minimum deviation.
In order to make the signal quality of the random access preamble sequence sent by the current device received by the gNB greater than or equal to the preset quality threshold, in an optional implementation manner, the method further includes: after transmitting the random access preamble sequence using the narrow beam having the minimum deviation, if the random access response is not received within a preset time duration, retransmitting the random access preamble sequence using other narrow beams except the narrow beam having the minimum deviation.
In an alternative implementation, the transmission power used for retransmitting the random access preamble sequence exceeds the transmission power used for transmitting the random access preamble sequence using the narrow beam with the minimum deviation by one power up step. In addition to using narrow beam to transmit random access preamble sequence to increase signal gain to indirectly increase the transmission power of the current device, the transmission power of the random access preamble sequence can be directly increased on the basis of the transmission power of the random preamble sequence transmitted in the previous time.
In an optional implementation manner, the determining whether the current device is a beam edge device based on the signal quality of the target receiving beam includes: determining the distance between the network equipment and the current equipment according to the signal quality of the target receiving beam; determining the radius of a cell covered by the network equipment according to the format parameter of the random access leader sequence; determining a position parameter threshold according to the format parameter of the random access leader sequence; and if the ratio of the distance to the cell radius is greater than or equal to the position parameter threshold, determining that the current equipment is beam edge equipment.
In an optional implementation manner, the determining a distance between a network device and the current device according to the signal quality of the target receiving beam includes: and determining the distance between the network equipment and the current equipment by utilizing the signal quality of the target receiving beam based on the preset corresponding relation between the signal quality and the distance.
In an optional implementation manner, the determining, according to the format parameter of the random access preamble sequence, a cell radius covered by the network device includes: and determining the cell radius covered by the network equipment by using the format parameter of the random access leader sequence based on the preset corresponding relation between the format parameter of the random access leader sequence and the cell radius.
In a second aspect, the present application illustrates an apparatus for transmitting a random access preamble sequence, the apparatus comprising: a first determination unit configured to determine whether the current device is a beam edge device based on a signal quality of a target reception beam; a splitting unit, configured to split a transmit beam corresponding to the target receive beam to obtain at least one narrow beam if the current device is the beam edge device, where a width of each narrow beam is smaller than a width of the transmit beam; a first transmitting unit, configured to transmit a random access preamble sequence using the at least one narrow beam.
In the application, since the width of the transmission beam corresponding to the target reception beam is greater than any one narrow beam, and therefore, the coverage area of the transmission beam corresponding to the target reception beam is greater than the coverage area of any one narrow beam, compared with the case that the transmission beam corresponding to the target reception beam is used for transmitting the random access preamble sequence, the use of the narrow beam for transmitting the random access preamble sequence can improve signal gain, so that the transmission power of the random access preamble sequence transmitted by the current device can be indirectly improved, and further, the signal quality of the random access preamble sequence transmitted by the current device and received by the gNB can be improved.
In an optional implementation, the apparatus further comprises: a receiving unit for receiving a plurality of signals on a plurality of candidate receive beams; a second determining unit for determining the signal quality of the candidate receiving beams based on the plurality of signals; a third determining unit for determining the target receive beam among the plurality of candidate receive beams based on the signal qualities of the plurality of candidate receive beams.
In order to reduce the collision probability and further reduce the random access delay, in an optional implementation manner, the apparatus further includes: a fourth determining unit, configured to determine whether the current device is a multi-beam coverage device; the third determining unit includes, if the current device is the multi-beam coverage device: the acquisition unit is used for acquiring the reference signal receiving quality and the signal to interference plus noise ratio (SINR) of each candidate receiving beam; a fifth determining unit configured to determine, among the plurality of candidate reception beams, a candidate reception beam having a best reference signal reception quality; a searching unit, configured to search, in remaining candidate receiving beams, at least one candidate receiving beam for which a difference between reference signal receiving quality of the candidate receiving beam with the best reference signal receiving quality is smaller than a preset threshold; a sixth determining unit, configured to determine, as the target receiving beam, a candidate receiving beam with a largest SINR among the at least one candidate receiving beam.
In an alternative implementation, the reference signal reception quality includes at least one of: reference signal received quality, RSRQ, and reference signal received power, RSRP.
In an alternative implementation, the at least one narrow beam is a plurality of narrow beams; the first sending unit is specifically configured to: transmitting the random access preamble sequence using one of the plurality of narrow beams.
In order to enable the gNB to receive the random access preamble sequence as soon as possible and further reduce the access delay, in an optional implementation manner, the first sending unit includes: a seventh determining unit, configured to determine a deviation between a departure angle of each of the plurality of narrow beams and a departure angle of the transmission beam corresponding to the target reception beam, so as to obtain a deviation corresponding to the plurality of narrow beams; a second transmitting unit, configured to transmit the random access preamble sequence using a narrow beam with a minimum deviation.
In order to enable the signal quality of the random access preamble sequence sent by the current device and received by the gNB to be greater than or equal to the preset quality threshold, in an optional implementation manner, the first sending unit further includes: and a third transmitting unit, configured to, after transmitting the random access preamble sequence using the narrow beam with the minimum deviation, if a random access response is not received within a preset time duration, retransmit the random access preamble sequence using another narrow beam except the narrow beam with the minimum deviation.
In order to enable the signal quality of the random access preamble sequence sent by the current device and received by the gNB to be greater than or equal to the preset quality threshold, in an optional implementation manner, the transmission power used for retransmitting the random access preamble sequence exceeds the transmission power used for transmitting the random access preamble sequence by using the narrow beam with the minimum deviation by one power ramping step. In addition to using narrow beam to transmit random access preamble sequence to increase signal gain to indirectly increase the transmission power of the current device, the transmission power of the random access preamble sequence can be directly increased on the basis of the transmission power of the random preamble sequence transmitted in the previous time.
In an optional implementation manner, the first determining unit includes: an eighth determining unit, configured to determine a distance between the network device and the current device according to the signal quality of the target receiving beam; a ninth determining unit, configured to determine, according to the format parameter of the random access preamble sequence, a cell radius covered by the network device; a tenth determining unit, configured to determine a location parameter threshold according to the format parameter of the random access preamble sequence; an eleventh determining unit, configured to determine that the current device is a beam edge device if a ratio between the distance and the cell radius is greater than or equal to the location parameter threshold.
In an optional implementation manner, the eighth determining unit is specifically configured to: and determining the distance between the network equipment and the current equipment by utilizing the signal quality of the target receiving beam based on the preset corresponding relation between the signal quality and the distance.
In an optional implementation manner, the ninth determining unit is specifically configured to: and determining the cell radius covered by the network equipment by using the format parameter of the random access leader sequence based on the preset corresponding relation between the format parameter of the random access leader sequence and the cell radius.
In a third aspect, the present application shows a computer-readable storage medium comprising instructions which, when run on a computer, cause the computer to perform the method of transmitting a random access preamble sequence according to the first aspect.
In a fourth aspect, the present application shows a computer program product which, when run on a computer, causes the computer to perform the method of transmitting a random access preamble sequence as described in the first aspect.
In a fifth aspect, the present application shows an apparatus comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the method for transmitting a random access preamble sequence according to the first aspect when executing the program.
In a sixth aspect, the present application shows an apparatus comprising a processor configured to execute a program to implement the method for transmitting a random access preamble sequence according to the first aspect. For example, the execution program is stored in the memory. Optionally, the device further comprises a transceiver for implementing signal transceiving functions. When the processor performs operations related to signal transceiving, the transceiving function is performed by driving or calling the transceiver. For example, the device may be a user equipment.
Drawings
FIG. 1 is a schematic diagram of a network architecture according to an example embodiment;
fig. 2 is a flow chart illustrating a method of transmitting a random access preamble sequence according to an example embodiment;
FIG. 3 is a schematic diagram of a scenario shown in accordance with an exemplary embodiment;
FIG. 4 is a flow diagram illustrating a method of determining whether a device is a beam edge device in accordance with an example embodiment;
FIG. 5 is a schematic diagram illustrating one manner of beam splitting in accordance with an exemplary embodiment;
FIG. 6 is a schematic diagram illustrating another manner of beam splitting in accordance with an exemplary embodiment;
fig. 7 is a schematic structural diagram illustrating a transmitting apparatus of a random access preamble sequence according to an exemplary embodiment;
FIG. 8 is a schematic diagram illustrating the structure of an apparatus according to an exemplary embodiment.
Detailed Description
It should be understood that the technical solution of the present application can be applied to various communication systems, for example: wideband Code Division Multiple Access (WCDMA) System, Code Division Multiple Access (CDMA 2000) System, Time Division-Synchronous Code Division Multiple Access (Time Division-Synchronous Code Division Multiple Access, TD-SCDMA) System, Long Term Evolution (Long Term Evolution, LTE) System, LTE Frequency Division Duplex (FDD) System, LTE Time Division Duplex (TDD) System, Universal Mobile telecommunications System (Universal Mobile telecommunications System, UMTS), Worldwide Interoperability for Microwave Access (WiMAX) System, and new radio (new radio, NR) System, etc., and thus, the Wideband Code Division Multiple Access (WCDMA) System, the Code Division Multiple Access (CDMA) System, the G3G 5, the G5, and the like can be considered as suitable for various communication schemes and do not limit the application.
The following description of the embodiments is given by taking the NR communication system in 5G as an example, but the present invention is not limited to this. There are multiple cells under each gNB, and in each cell, the gNB may use multiple gNB transmit beams to complete cell coverage, and in the downlink direction, the gNB uses the gNB transmit beams to transmit downlink data. When the user equipment is located in the coverage of the gNB transmit beam, the user equipment may receive downlink data transmitted by the gNB using a receive beam, which may correspond to the transmit beam used by the gNB.
As an example, fig. 1 shows a schematic diagram of a network architecture on which the present application is based. The network architecture comprises a network device 01 and a user equipment 02; the network device 01 in fig. 1 may be a gNB or the like in the NR system; the user equipment 02 in fig. 1 may be called a wireless communication terminal, and may be in the form of various terminals such as a mobile phone, a tablet computer, or a router, and hereinafter, the user equipment is simply referred to as a device. In the following embodiments, a gbb in the 5G NR communication system is taken as an example of a network device for description, but the invention is not limited to the technical solutions.
Fig. 2 is a flowchart illustrating a method for transmitting a random access preamble sequence according to an exemplary embodiment, which is used in the device 02 shown in fig. 1, as shown in fig. 2, and includes the following steps.
In step S101, it is determined whether the current device is a beam edge device based on the signal quality of the target reception beam; in the present application, the current device 02 has multiple candidate receive beams, and the directions of the different candidate receive beams are different, and the current device 02 can receive multiple signals on the multiple candidate receive beams, as shown in fig. 1. The present device 02 may further determine signal qualities of a plurality of candidate receive beams based on the plurality of signals and determine a target receive beam among the plurality of candidate receive beams based on the signal qualities of the plurality of candidate receive beams, e.g., determine the candidate receive beam with the best signal quality as the target receive beam. The current device 02 may transmit a random access preamble sequence using a transmission beam corresponding to the target reception beam to establish an uplink channel with the gNB.
Where the signal quality of signals received by the present device 02 on different candidate receive beams differs, including RSRP, RSRQ, SINR, etc., the signal quality of a signal received on any one candidate receive beam may be determined as the signal quality of that candidate receive beam, and so on for each of the other candidate receive beams.
In this application, if the current device 02 is located in the coverage of the gNB transmit beam of the gNB but is far away from the gNB, so that the signal quality of the downlink data transmitted by the gNB and received by the current device 02 using the target receive beam is poor, for example, the signal quality is less than a preset quality threshold, the current device 02 is a beam edge device.
In the present application, the gNB has a plurality of gNB transmission beams, and the directions of different gNB transmission beams are different, and in the downlink direction, the gNB generally transmits downlink data using the plurality of gNB transmission beams, as shown in fig. 1.
In this application, the current device 02 may be located in the coverage area of multiple gNB transmit beams at the same time, so that the current device 02 can receive signals transmitted by the gNB using each of the gNB transmit beams on the target receive beam. If the signal quality of at least two signals among the plurality of signals received by the current device 02 on the target receiving beam is greater than or equal to the preset quality threshold, the current device 02 is determined to be a multi-beam coverage device.
For example, as shown in fig. 3, the current device 02 is simultaneously covered by two gNB transmit beams, which in fig. 3 are a gNB transmit beam a and a gNB transmit beam B, respectively. Assuming that the current device 02 has 3 candidate receive beams in different directions, the current device 02 can receive 2 signals on each candidate receive beam for a total of 6 signals.
Wherein, if the current device 02 is a multi-beam coverage device, determining a target receiving beam among a plurality of candidate receiving beams based on signal quality of the plurality of candidate receiving beams may be implemented by: acquiring the reference signal receiving quality and SINR of each candidate receiving beam; the reference signal reception quality includes at least one of: reference Signal Receiving Quality (RSRQ) and Reference Signal Receiving Power (RSRP). Then determining a candidate receiving beam with the best reference signal receiving quality in the plurality of candidate receiving beams; then at least one candidate receiving beam with the difference value smaller than a preset threshold value with the reference signal receiving quality of the candidate receiving beam with the best signal receiving quality is searched in the rest candidate receiving beams; and among the at least one candidate receiving beam, determining the candidate receiving beam with the largest SINR as the target receiving beam.
In general, when the current device 02 is simultaneously covered by multiple gNB transmission beams, the random access preamble sequence is usually transmitted by the transmission beam corresponding to the candidate reception beam with the best reference signal reception quality. However, if there are many devices simultaneously needing to establish an uplink channel with the gNB within the coverage of the gNB transmission beam matched with the candidate reception beam with the best reference signal reception quality, the collision probability is high, for example, if the current device 02 and other devices simultaneously contend for the same time-frequency resource to transmit a random access preamble sequence, since only one device can successfully contend for the time-frequency resource, the current device 02 may not rapidly contend for the time-frequency resource, and further the current device 02 may not timely transmit the random access preamble sequence, so that the gNB cannot timely receive the random access preamble sequence, and further the random access delay is large. Therefore, when determining the target reception beam among the plurality of candidate reception beams based on the signal qualities of the plurality of candidate reception beams, it is necessary to consider the SINR of the candidate reception beam in addition to the reference signal reception quality of the candidate reception beam. For example, whether there are many devices simultaneously initiating access in the coverage area of the gNB transmission beam matching the candidate reception beam is determined, the SINR of the candidate reception beam is lower when the number of devices simultaneously initiating access is larger, and the SINR of the candidate reception beam is higher when the number of devices simultaneously initiating access is smaller.
When the SINR of the received beam is high, it indicates that only a small number of devices simultaneously initiate access in the coverage area of the gNB transmit beam matched with the received beam, or even no other devices simultaneously initiate access, so that the collision probability can be reduced, and the random access delay can be further reduced.
In the present application, referring to fig. 4, step S101 includes: in step S201, determining a distance between the gNB and the current device according to the signal quality of the target receiving beam; in the application, a gNB and a device may be set in advance, the location of the gNB is fixed, the location of the device is variable, the gNB continuously uses the gNB transmit beam to transmit downlink signals, a technician carries the device to move within the coverage of the gNB transmit beam, for example, the device may continuously approach the gNB or continuously leave the gNB, and the technician may measure the distance between the device and the gNB every time the technician moves to a location, and the device may receive downlink signals using the receive beam and determine the signal quality of the downlink signals, and then the technician may combine the determined signal quality and the measured distance into one record and store the record in the preset corresponding relationship between the signal quality and the distance. Of course, the corresponding relationship may be preset by a person skilled in the art according to experience, besides being measured and preset in the device. As such, in this step, the distance between the gNB and the current device 02 may be determined using the signal quality of the target reception beam based on the correspondence between the signal quality and the distance set in advance.
In step S202, determining a cell radius covered by the gNB according to a format parameter of the random access preamble sequence; the format parameter is used for indicating a corresponding format, the format corresponds to preset protection time, and different formats correspond to different protection time. This will be described later.
In the present application, the random access preamble sequence has 5 format parameters, each of which supports a different maximum cell radius. For example, the cell radius may be calculated by the following manner, where the length of each subframe is 30720Ts, and the remaining time after the time occupied by the random preamble sequence is removed is the guard time, so that the format parameter 0 of the random access preamble sequence still has the remaining guard time GT (30720-. A part of guard time interval is left, before random access, the device does not complete uplink synchronization with the gNB, and the position of the device in the cell is uncertain, so that a period of time needs to be reserved for a random access preamble sequence to avoid interference with other subframes. Considering the round-trip transmission between the gNB and the device, the maximum cell radius is (3.0 x 10^8) m/s 96.875us/2 is 14.53 km. Similarly, the maximum cell radius supported by the format parameters of other random access preamble sequences can be calculated. Alternatively, the cell radius corresponding to the format parameter may be obtained through measurement and preset in the device, or may be preset according to experience by those skilled in the art. Therefore, different cell radii, different format parameters of the random access preamble sequence can be selected.
For any format parameter of the random access leader sequence, the format parameter of the random access leader sequence and the maximum cell radius supported by the format parameter of the random access leader sequence can form a record and are stored in the corresponding relation between the format parameter of the random access leader sequence and the cell radius which are stored in advance; the same is true for the format parameter of each of the other random access preamble sequences.
In the application, the gbb knows the radius of the cell covered by the gbb in advance, before the device sends the random access preamble sequence to the gbb, the gbb may send a reference signal by using a gbb sending beam, the reference signal carries format parameters of the random access preamble sequence, after the current device 02 receives the reference signal, the format parameters of the random access preamble sequence may be extracted from the reference signal, and then the radius of the cell covered by the gbb is determined by using the format parameters of the random access preamble sequence based on a preset correspondence between the format parameters of the random access preamble sequence and the radius of the cell.
In step S203, determining a position parameter threshold according to a format parameter of a random access preamble sequence; the position parameter threshold may be preset or calculated empirically by one skilled in the art. In step S204, if the ratio between the distance and the cell radius is greater than or equal to the location parameter threshold, it is determined that the current device is a beam edge device.
In the present application, the position parameter thresholds corresponding to the format parameters of different random access preamble sequences are different. For example, for any format parameter, a gNB and a device may be set in advance, the location of the gNB is fixed, the location of the device is variable, the radius of a cell covered by the gNB corresponding to the format parameter is fixed, the gNB continuously transmits a downlink signal using a gNB transmit beam, a technician carrying the device moves within the coverage range of the gNB transmit beam, for example, the device may continuously approach the gNB or continuously move away from the gNB, and each time the technician moves to a location, the technician may measure a distance between the device and the gNB, calculate a ratio between the distance and the radius of the cell covered by the gNB, input the ratio to the device, receive the downlink signal on the receive beam, compare whether the signal quality of the downlink signal is greater than or equal to a preset quality threshold, and store the ratio and the signal quality obtained when the distance is separated from the gNB. After obtaining the ratio and the signal quality obtained when each distance is separated from the gNB, the minimum ratio which is greater than or equal to the preset quality threshold value is taken as the position parameter threshold value corresponding to the format parameter, the format parameter and the position parameter threshold value form a record, and the record is stored in the corresponding relation between the format parameter and the position parameter threshold value of the preset random access preamble sequence.
The above operation is also performed for each of the other format parameters. Thus, in the present application, in the preset correspondence between the format parameter of the random access preamble sequence and the location parameter threshold, a location parameter threshold corresponding to the format parameter of the random access preamble sequence carried in the reference signal may be determined, the ratio obtained in step S202 is compared with the location parameter threshold determined in step S203, if the ratio obtained in step S202 is greater than or equal to the location parameter threshold determined in step S203, it is determined that the current device 02 is farther from the gNB, the current device 02 is a beam edge device, if the ratio obtained in step S202 is smaller than the location parameter threshold determined in step S203, it is determined that the current device 02 is closer to the gNB, and the current device 02 is not a beam edge device.
If the current device is not a beam edge device, in step S102, a random access preamble sequence is transmitted using a transmission beam corresponding to a target reception beam; then, the signal quality of the random access preamble sequence received by the gNB is greater than or equal to the preset quality threshold, and the current device 02 may send a random access response using the transmission beam corresponding to the target reception beam.
If the current device is a beam edge device, in step S103, splitting the transmission beam corresponding to the target reception beam to obtain at least one narrow beam, where the width of each narrow beam is smaller than the width of the transmission beam; the splitting method for splitting the target receiving beam into the at least one narrow beam is not limited, and the width of each narrow beam obtained by splitting is only required to be smaller than the width of the transmitting beam corresponding to the target receiving beam.
For example, referring to fig. 5, an example of splitting the transmission beam corresponding to the target reception beam into 3 narrow beams is illustrated. In step S104, a random access preamble sequence is transmitted using at least one narrow beam. In this application, after splitting the transmission beam corresponding to the target reception beam, if at least one narrow beam is a plurality of narrow beams, any one of the plurality of narrow beams may be used to transmit the random access preamble sequence.
In the present application, since the width of the transmission beam corresponding to the target reception beam is greater than any one narrow beam, and therefore, the coverage area of the transmission beam corresponding to the target reception beam is greater than the coverage area of any one narrow beam, compared with the case where the transmission beam corresponding to the target reception beam is used to transmit the random access preamble sequence, the use of the narrow beam to transmit the random access preamble sequence can improve signal gain, thereby indirectly improving the transmission power of the random access preamble sequence transmitted by the current device 02, and further improving the signal quality of the random access preamble sequence transmitted by the current device 02 and received by the gNB.
In the present application, directions of multiple narrow beams obtained by splitting a transmission beam corresponding to a target reception beam are different from each other, and although it is possible to improve signal gain by using the narrow beams to transmit a random access preamble sequence, when the direction of the narrow beams is not aligned with the gNB, it may cause that the signal quality of the random access preamble sequence transmitted by the current device 02 received by the gNB is still less than a preset quality threshold, which results in a higher random access delay. Therefore, in order to reduce the random access delay, in the present application, after splitting the transmission beam corresponding to the target reception beam, if at least one narrow beam is a plurality of narrow beams, determining a deviation between a departure angle of each of the plurality of narrow beams and a departure angle of the transmission beam corresponding to the target reception beam to obtain a deviation corresponding to the plurality of narrow beams; the random access preamble sequence is transmitted using a narrow beam with a minimum deviation.
For example, referring to fig. 6, an example of splitting the equal part of the transmission beam corresponding to the target reception beam into 5 narrow beams is illustrated. In fig. 6, the transmission beam corresponding to the target reception beam is a beam 101, and the transmission beam corresponding to the target reception beam is divided into 5 narrow beams, i.e., a narrow beam 111, a narrow beam 112, a narrow beam 113, a narrow beam 114, and a narrow beam 115. Wherein the deviation between narrow beam 113 and beam 101 is minimal, the deviation between narrow beam 112 and beam 101 is greater than the deviation between narrow beam 113 and beam 101, the deviation between narrow beam 111 and beam 101 is greater than the deviation between narrow beam 112 and beam 101, the deviation between narrow beam 114 and beam 101 is greater than the deviation between narrow beam 113 and beam 101, and the deviation between narrow beam 115 and beam 101 is greater than the deviation between narrow beam 114 and beam 101.
Specifically, the deviation between the departure angle of each narrow beam and the departure angle of the transmission beam corresponding to the target reception beam may be determined; sequencing the narrow beams according to the sequence of the deviation from small to large; the random access preamble sequence is then transmitted using the first narrow beam after the ordering. The deviation in this application includes the absolute value of the difference between the angle of departure of the narrow beam and the angle of departure of the transmit beam to which the receive beam corresponds.
For example, in fig. 6, assume a beamThe beam width of the beam 101 is θ, and the departure angle of the beam 101 is α, then after dividing the beam 101 into 5 equal parts, the beam widths of the narrow beam 111, the narrow beam 112, the narrow beam 113, the narrow beam 114, and the narrow beam 115 are all θ/5, and the departure angles are:andthe absolute value of the difference between the exit angle of the beam 101 and the exit angle of the narrow beam 111 isThe absolute value of the difference between the exit angle of the beam 101 and the exit angle of the narrow beam 112 isThe absolute value of the difference between the exit angle of the beam 101 and the exit angle of the narrow beam 113 is 0; the absolute value of the difference between the exit angle of the beam 101 and the exit angle of the narrow beam 114 isThe absolute value of the difference between the exit angle of the beam 101 and the exit angle of the narrow beam 115 is
In this application, the target receiving beam selected in step S101 is one of several candidate beams with high reference signal receiving quality, and therefore, compared with other candidate receiving beams, the target receiving beam is one of several candidate receiving beams in which the direction of the corresponding transmitting beam and the corresponding gbb pair are aligned, and therefore, the direction of the narrow beam with the smallest deviation is aligned with the gbb pair, and therefore, the narrow beam with the smallest deviation is used to transmit the random access preamble sequence, so that the signal quality of the random access preamble sequence received by the gbb can be made as large as possible to be greater than or equal to the preset quality threshold, and further, the random access response can be transmitted to the current device 02, and the current device 02 is prevented from transmitting the random access preamble sequence for multiple times, so that the random access delay can be reduced.
However, since the SINR needs to be considered in addition to the reference signal reception quality when selecting the target reception beam from the multiple candidate reception beams, it is likely that the target reception beam is not the best candidate reception beam of the pair of the corresponding transmission beam and the gNB, and thus, although transmitting the random access preamble sequence using the narrow beam with the minimum deviation may improve the signal gain, the signal quality of the random access preamble sequence transmitted by the current device 02 and received by the gNB may still be smaller than the preset quality threshold, which may result in a higher random access delay. Therefore, in order to reduce the random access delay, in the present application, after the random access preamble sequence is transmitted using the narrow beam having the smallest deviation, if the random access response is not received within a preset time period, the random access preamble sequence is retransmitted using other narrow beams except for the narrow beam having the smallest deviation.
Specifically, the ordered N +1 th narrow beam may be used to transmit the random access preamble sequence, where N is greater than or equal to 1 and less than the total number of the split narrow beams. Therefore, the current device 02 then uses the narrow beam with the direction aligned to the gNB to transmit the random access preamble sequence, so that the signal quality of the random access preamble sequence received by the gNB is greater than or equal to the preset quality threshold as much as possible, and then the random access response can be transmitted to the current device 02, thereby avoiding the current device 02 from transmitting the random access preamble sequence for many times, and reducing the random access delay.
After the random access preamble sequence is sent for the first time, if the random access response is not received, in order to enable the gNB to receive the random access preamble sequence with the signal quality greater than or equal to the preset quality threshold as soon as possible, in the present application, the sending power used for resending the random access preamble sequence exceeds the sending power used for sending the random access preamble sequence by using the narrow beam with the minimum deviation by one power-up step. For example, the N +1 th transmission power is the sum of the nth transmission power and the preset power increasing step size, and the N +1 th transmission power is the sum of the nth transmission power and the preset power increasing step size.
In this way, in addition to using a narrow beam to transmit the random access preamble sequence to increase the signal gain to indirectly increase the transmission power of the current device 02, the transmission power for transmitting the random access preamble sequence may be directly increased on the basis of the transmission power for transmitting the random access preamble sequence at the previous time. Under the dual guarantee of directly increasing the transmission power of the current device 02 and increasing the signal gain to indirectly increase the transmission power of the current device 02, the gNB can receive the random access preamble sequence with the signal quality greater than or equal to the preset quality threshold as soon as possible, and then can send the random access response to the current device 02 as early as possible, thereby reducing the random access delay.
Fig. 7 is a schematic structural diagram illustrating a transmitting apparatus of a random access preamble sequence according to an exemplary embodiment, where, as shown in fig. 7, the apparatus includes: a first determining unit 11, configured to determine whether the current device is a beam edge device based on the signal quality of the target receiving beam; a splitting unit 12, configured to split a transmit beam corresponding to the target receive beam to obtain at least one narrow beam if the current device is the beam edge device, where a width of each narrow beam is smaller than a width of the transmit beam; a first transmitting unit 13, configured to transmit a random access preamble sequence using the at least one narrow beam.
In the application, since the width of the transmission beam corresponding to the target reception beam is greater than any one narrow beam, and therefore, the coverage area of the transmission beam corresponding to the target reception beam is greater than the coverage area of any one narrow beam, compared with the case that the transmission beam corresponding to the target reception beam is used for transmitting the random access preamble sequence, the use of the narrow beam for transmitting the random access preamble sequence can improve signal gain, so that the transmission power of the random access preamble sequence transmitted by the current device can be indirectly improved, and further, the signal quality of the random access preamble sequence transmitted by the current device and received by the gNB can be improved.
In an optional implementation, the apparatus further comprises: a receiving unit 21 for receiving a plurality of signals on a plurality of candidate receive beams; a second determining unit 22 for determining the signal quality of the candidate receive beams based on the plurality of signals; a third determining unit 23, configured to determine the target receive beam among the plurality of candidate receive beams based on the signal qualities of the plurality of candidate receive beams.
In order to reduce the collision probability and further reduce the random access delay, in an optional implementation manner, the apparatus further includes: a fourth determining unit 31, configured to determine whether the current device is a multi-beam coverage device; if the current device is the multi-beam coverage device, the third determining unit 23 includes: an obtaining unit 231, configured to obtain a reference signal received quality and a signal to interference plus noise ratio SINR of each candidate received beam; a fifth determining unit 232, configured to determine, among the plurality of candidate reception beams, a candidate reception beam with the best reference signal reception quality; a searching unit 233, configured to search, among remaining candidate receiving beams, for at least one candidate receiving beam whose difference from the reference signal receiving quality of the candidate receiving beam with the best reference signal receiving quality is smaller than a preset threshold; a sixth determining unit 234, configured to determine, as the target receiving beam, a candidate receiving beam with a largest SINR among the at least one candidate receiving beam.
In an alternative implementation, the reference signal reception quality includes at least one of: reference signal received quality, RSRQ, and reference signal received power, RSRP.
In an alternative implementation, the at least one narrow beam is a plurality of narrow beams; the first sending unit 13 is specifically configured to: transmitting the random access preamble sequence using one of the plurality of narrow beams.
In order to enable the gNB to receive the random access preamble sequence as soon as possible and further reduce the access delay, in an optional implementation manner, the first sending unit 13 includes: a seventh determining unit 131, configured to determine a deviation between a departure angle of each of the plurality of narrow beams and a departure angle of the transmission beam corresponding to the target reception beam, so as to obtain a deviation corresponding to the plurality of narrow beams; a second transmitting unit 132, configured to transmit the random access preamble sequence using a narrow beam with a minimum deviation.
In order to enable the signal quality of the random access preamble sequence sent by the current device and received by the gNB to be greater than or equal to the preset quality threshold, in an optional implementation manner, the first sending unit 13 further includes: a third transmitting unit 133, configured to, after transmitting the random access preamble sequence using the narrow beam with the minimum deviation, if the random access response is not received within the preset time duration, retransmit the random access preamble sequence using another narrow beam except the narrow beam with the minimum deviation.
In order to enable the signal quality of the random access preamble sequence sent by the current device and received by the gNB to be greater than or equal to the preset quality threshold, in an optional implementation manner, the transmission power used for retransmitting the random access preamble sequence exceeds the transmission power used for transmitting the random access preamble sequence by using the narrow beam with the minimum deviation by one power ramping step. In addition to using narrow beam to transmit random access preamble sequence to increase signal gain to indirectly increase the transmission power of the current device, the transmission power of the random access preamble sequence can be directly increased on the basis of the transmission power of the random preamble sequence transmitted in the previous time.
In an optional implementation manner, the first determining unit 11 includes: an eighth determining unit 111, configured to determine a distance between a network device and the current device according to the signal quality of the target receiving beam; a ninth determining unit 112, configured to determine, according to the format parameter of the random access preamble sequence, a cell radius covered by the network device; a tenth determining unit 113, configured to determine a location parameter threshold according to the format parameter of the random access preamble sequence; an eleventh determining unit 114, configured to determine that the current device is a beam edge device if a ratio between the distance and the cell radius is greater than or equal to the location parameter threshold.
In an optional implementation manner, the eighth determining unit 111 is specifically configured to: and determining the distance between the network equipment and the current equipment by utilizing the signal quality of the target receiving beam based on the preset corresponding relation between the signal quality and the distance.
In an optional implementation manner, the ninth determining unit 112 is specifically configured to: and determining the cell radius covered by the network equipment by using the format parameter of the random access leader sequence based on the preset corresponding relation between the format parameter of the random access leader sequence and the cell radius.
The present application also shows a computer-readable storage medium comprising instructions which, when run on a computer, cause the computer to perform the method of the previous embodiment, such as the method of transmitting a random access preamble sequence as described in fig. 2.
The present application also shows a computer program product which, when run on a computer, causes the computer to perform the method of the previous embodiment, such as the method of transmitting a random access preamble sequence as described in fig. 2.
The present application further shows a schematic structural diagram of a device for performing a method for sending a random access preamble sequence, as shown in fig. 8, the device includes: one or more processors 610 and a memory 620, with one processor 610 being an example in fig. 8. The apparatus for performing the transmission method of the random access preamble sequence may further include: a transceiver 630.
The processor 610, memory 620, and transceiver 630 may be connected by a bus or other means, such as by bus connection 640 in fig. 8. The memory 620 is a non-volatile computer-readable storage medium, and can be used to store a non-volatile software program, a non-volatile computer-executable program, and modules, such as program instructions corresponding to the method for sending a random access preamble sequence in the embodiment of the present application (for example, the instructions may exist in the form of the first determining module 11, the splitting module 12, and the first sending module 13 shown in fig. 7). The processor 610 executes various functional applications and data processing, i.e., implements the transmission method of the random access preamble sequence in the above-described method embodiments, by executing a non-volatile software program or instructions stored in the memory 620.
The memory 620 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function, and program instructions for implementing the above-described method; the storage data area may store data created according to use of a transmitting apparatus of the random access preamble sequence, and the like. Further, the memory 620 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the memory 620 optionally includes memory remotely located from the processor 610, and such remote memory may be connected to the transmitting means of the random access preamble sequence via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof. The one or more modules are stored in the memory 620 and, when executed by the one or more processors 610, perform the method for transmitting a random access preamble sequence in any of the above-described method embodiments.
The processor 610 is used to execute the program instructions in the memory 620 to implement the methods in the previous embodiments. The transceiver 630 may be used to perform specific signal transceiving by driving or invoking the transceiver 630 when the processor 610 needs to perform the signal transceiving. The specific driving transceiver 630 transmits the random access preamble sequence, for example, when the processor needs to transmit the random access preamble sequence using the at least one narrow beam. In this case, the processor 610 corresponds to a controller and a trigger for performing transmission, and the transceiver 630 corresponds to an implementer. The transceiver 630 may include at least one of a radio frequency device, a digital device, or an analog device. For example, the transceiver 630 may include necessary components for transceiving communication signals, such as amplifiers, mixers, transformers, or filters.
The product can execute the method provided by the embodiment of the application, and has the corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the methods provided in the embodiments of the present application. The devices of embodiments of the present invention exist in a variety of forms including, but not limited to, (1) mobile communication devices that are characterized by mobile communication capabilities and that are primarily targeted at providing voice, data communications. Such terminals include smart phones (e.g., iphones), multimedia phones, functional phones, and low-end phones, among others. (2) The ultra-mobile personal computer equipment belongs to the category of personal computers, has calculation and processing functions and generally has the characteristic of mobile internet access. Such terminals include PDA, MID, and UMPC devices, such as ipads. (3) Portable entertainment devices such devices may display and play multimedia content. Such devices include audio and video players (e.g., ipods), handheld game consoles, electronic books, as well as smart toys and portable car navigation devices. (4) The server is similar to a general computer architecture, but has higher requirements on processing capability, stability, reliability, safety, expandability, manageability and the like because of the need of providing highly reliable services. (5) And other electronic devices with data interaction functions.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a general hardware platform, and certainly can also be implemented by hardware. Based on such understanding, the above technical solutions substantially or contributing to the related art may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (18)
1. A method for transmitting a random access preamble sequence, the method comprising:
determining whether the current device is a beam edge device based on the signal quality of the target receive beam;
if the current device is the beam edge device, splitting a transmitting beam corresponding to the target receiving beam to obtain a plurality of narrow beams, wherein the width of each narrow beam is smaller than that of the transmitting beam;
transmitting a random access preamble sequence using one of the plurality of narrow beams;
wherein the transmitting a random access preamble sequence using one of the plurality of narrow beams comprises:
determining a deviation between an exit angle of each of the plurality of narrow beams and an exit angle of a transmit beam corresponding to the target receive beam to obtain a deviation corresponding to the plurality of narrow beams;
transmitting the random access preamble sequence using a narrow beam with a minimum deviation.
2. The method of claim 1, further comprising:
receiving a plurality of signals on a plurality of candidate receive beams;
determining signal qualities of the plurality of candidate receive beams based on the plurality of signals;
determining the target receive beam among the plurality of candidate receive beams based on signal qualities of the plurality of candidate receive beams.
3. The method of claim 2, further comprising:
determining whether the current device is a multi-beam coverage device;
determining the target receive beam among the plurality of candidate receive beams based on the signal qualities of the plurality of candidate receive beams if the current device is the multi-beam overlay device, comprising:
acquiring the reference signal receiving quality and the signal to interference plus noise ratio (SINR) of each candidate receiving beam;
determining a candidate receiving beam with the best reference signal receiving quality in a plurality of candidate receiving beams;
searching for at least one candidate receiving beam with a difference value smaller than a preset threshold value with respect to the reference signal receiving quality of the candidate receiving beam with the best reference signal receiving quality in the remaining candidate receiving beams;
among the at least one candidate receiving beam, the candidate receiving beam with the largest SINR is determined as the target receiving beam.
4. The method of claim 3, wherein the reference signal received quality comprises at least one of: reference signal received quality, RSRQ, and reference signal received power, RSRP.
5. The method of claim 1, further comprising:
after transmitting the random access preamble sequence using the narrow beam having the minimum deviation, if the random access response is not received within a preset time duration, retransmitting the random access preamble sequence using other narrow beams except the narrow beam having the minimum deviation.
6. The method of claim 5, wherein the transmission power used for the retransmission of the random access preamble sequence exceeds the transmission power used for the transmission of the random access preamble sequence using the narrow beam with the smallest deviation by one power ramping step.
7. The method of any of claims 1-6, wherein determining whether the current device is a beam edge device based on the signal quality of the target receive beam comprises:
determining the distance between the network equipment and the current equipment according to the signal quality of the target receiving beam;
determining the radius of a cell covered by the network equipment according to the format parameter of the random access leader sequence;
determining a position parameter threshold according to the format parameter of the random access leader sequence;
and if the ratio of the distance to the cell radius is greater than or equal to the position parameter threshold, determining that the current equipment is beam edge equipment.
8. The method of claim 7, wherein determining the distance between the network device and the current device according to the signal quality of the target receive beam comprises:
and determining the distance between the network equipment and the current equipment by utilizing the signal quality of the target receiving beam based on the preset corresponding relation between the signal quality and the distance.
9. The method of claim 8, wherein the determining a cell radius covered by the network device according to the format parameter of the random access preamble sequence comprises:
and determining the cell radius covered by the network equipment by using the format parameter of the random access leader sequence based on the preset corresponding relation between the format parameter of the random access leader sequence and the cell radius.
10. An apparatus for transmitting a random access preamble sequence, the apparatus comprising:
a first determination unit configured to determine whether the current device is a beam edge device based on a signal quality of a target reception beam;
a splitting unit, configured to split a transmit beam corresponding to the target receive beam to obtain multiple narrow beams if the current device is the beam edge device, where a width of each narrow beam is smaller than a width of the transmit beam;
a first transmitting unit, configured to transmit a random access preamble sequence using one of the plurality of narrow beams;
wherein the first sending unit comprises a seventh determining unit and a second sending unit;
the seventh determining unit is configured to determine a deviation between a departure angle of each of the plurality of narrow beams and a departure angle of a transmission beam corresponding to the target reception beam, so as to obtain a deviation corresponding to the plurality of narrow beams;
the second transmitting unit is configured to transmit the random access preamble sequence using a narrow beam with a minimum deviation.
11. The apparatus of claim 10, further comprising:
a receiving unit for receiving a plurality of signals on a plurality of candidate receive beams;
a second determining unit for determining the signal quality of the candidate receiving beams based on the plurality of signals;
a third determining unit for determining the target receive beam among the plurality of candidate receive beams based on the signal qualities of the plurality of candidate receive beams.
12. The apparatus of claim 11, further comprising:
a fourth determining unit, configured to determine whether the current device is a multi-beam coverage device;
the third determining unit includes, if the current device is the multi-beam coverage device:
the acquisition unit is used for acquiring the reference signal receiving quality and the signal to interference plus noise ratio (SINR) of each candidate receiving beam;
a fifth determining unit configured to determine, among the plurality of candidate reception beams, a candidate reception beam having a best reference signal reception quality;
a searching unit, configured to search, in remaining candidate receiving beams, at least one candidate receiving beam for which a difference between reference signal receiving quality of the candidate receiving beam with the best reference signal receiving quality is smaller than a preset threshold;
a sixth determining unit, configured to determine, as the target receiving beam, a candidate receiving beam with a largest SINR among the at least one candidate receiving beam.
13. The apparatus of claim 12, wherein the reference signal received quality comprises at least one of: reference signal received quality, RSRQ, and reference signal received power, RSRP.
14. The apparatus of claim 10, wherein the first sending unit further comprises:
and a third transmitting unit, configured to, after transmitting the random access preamble sequence using the narrow beam with the minimum deviation, if a random access response is not received within a preset time duration, retransmit the random access preamble sequence using another narrow beam except the narrow beam with the minimum deviation.
15. The apparatus of claim 14, wherein the transmission power used for the retransmission of the random access preamble sequence exceeds the transmission power used for the transmission of the random access preamble sequence using the narrow beam with the smallest deviation by one power ramping step.
16. The apparatus according to any one of claims 10-15, wherein the first determining unit comprises:
an eighth determining unit, configured to determine a distance between the network device and the current device according to the signal quality of the target receiving beam;
a ninth determining unit, configured to determine, according to the format parameter of the random access preamble sequence, a cell radius covered by the network device;
a tenth determining unit, configured to determine a location parameter threshold according to the format parameter of the random access preamble sequence;
an eleventh determining unit, configured to determine that the current device is a beam edge device if a ratio between the distance and the cell radius is greater than or equal to the location parameter threshold.
17. The apparatus according to claim 16, wherein the eighth determining unit is specifically configured to: and determining the distance between the network equipment and the current equipment by utilizing the signal quality of the target receiving beam based on the preset corresponding relation between the signal quality and the distance.
18. The apparatus according to claim 17, wherein the ninth determining unit is specifically configured to: and determining the cell radius covered by the network equipment by using the format parameter of the random access leader sequence based on the preset corresponding relation between the format parameter of the random access leader sequence and the cell radius.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201711184367.3A CN109831795B (en) | 2017-11-23 | 2017-11-23 | Method and device for sending random access leader sequence |
PCT/CN2018/116959 WO2019101137A1 (en) | 2017-11-23 | 2018-11-22 | Method and apparatus for sending random access preamble sequence |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201711184367.3A CN109831795B (en) | 2017-11-23 | 2017-11-23 | Method and device for sending random access leader sequence |
Publications (2)
Publication Number | Publication Date |
---|---|
CN109831795A CN109831795A (en) | 2019-05-31 |
CN109831795B true CN109831795B (en) | 2022-04-12 |
Family
ID=66630483
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201711184367.3A Active CN109831795B (en) | 2017-11-23 | 2017-11-23 | Method and device for sending random access leader sequence |
Country Status (2)
Country | Link |
---|---|
CN (1) | CN109831795B (en) |
WO (1) | WO2019101137A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112929968B (en) * | 2019-12-06 | 2023-01-06 | 华为技术有限公司 | Transmission method, device and storage medium of random access preamble |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016124218A1 (en) * | 2015-02-02 | 2016-08-11 | Telefonaktiebolaget Lm Ericsson (Publ) | Utilization of antenna beam information |
CN106358216A (en) * | 2015-07-17 | 2017-01-25 | 北京信威通信技术股份有限公司 | Multi-beam random access method |
WO2017123079A1 (en) * | 2016-01-14 | 2017-07-20 | Samsung Electronics Co., Ltd. | Method and apparatus for generating beam measurement information in a wireless communication system |
CN107041012A (en) * | 2016-02-03 | 2017-08-11 | 北京三星通信技术研究有限公司 | Accidental access method, base station equipment and user equipment based on Difference Beam |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20140056561A (en) * | 2012-10-29 | 2014-05-12 | 한국전자통신연구원 | Method for operation of terminal and base-statin in cellular telecommunication system operating multiple beams |
EP3123802B1 (en) * | 2014-03-25 | 2018-10-03 | Telefonaktiebolaget LM Ericsson (publ) | System and method for beam-based physical random-access |
KR102109918B1 (en) * | 2015-06-15 | 2020-05-12 | 삼성전자주식회사 | Apparatus and method for beamforming using antenna array in wireless communication system |
US20170026962A1 (en) * | 2015-07-23 | 2017-01-26 | Futurewei Technologies, Inc. | Beam detection and tracking in wireless networks |
CN106255037B (en) * | 2016-08-01 | 2020-04-24 | 上海无线通信研究中心 | Random access method and system for Internet of things equipment based on large-scale MIMO technology |
-
2017
- 2017-11-23 CN CN201711184367.3A patent/CN109831795B/en active Active
-
2018
- 2018-11-22 WO PCT/CN2018/116959 patent/WO2019101137A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016124218A1 (en) * | 2015-02-02 | 2016-08-11 | Telefonaktiebolaget Lm Ericsson (Publ) | Utilization of antenna beam information |
CN106358216A (en) * | 2015-07-17 | 2017-01-25 | 北京信威通信技术股份有限公司 | Multi-beam random access method |
WO2017123079A1 (en) * | 2016-01-14 | 2017-07-20 | Samsung Electronics Co., Ltd. | Method and apparatus for generating beam measurement information in a wireless communication system |
CN107041012A (en) * | 2016-02-03 | 2017-08-11 | 北京三星通信技术研究有限公司 | Accidental access method, base station equipment and user equipment based on Difference Beam |
Also Published As
Publication number | Publication date |
---|---|
WO2019101137A1 (en) | 2019-05-31 |
CN109831795A (en) | 2019-05-31 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN110062398B (en) | Beam recovery method and device | |
CN114080047B (en) | Signal transmission method, terminal and network side equipment for random access | |
RU2750572C1 (en) | Signal processing method and equipment | |
WO2022117021A1 (en) | Random access method and apparatus, terminal and network side device | |
CN114287164B (en) | Method and device for TA (timing advance) processing of terminal | |
US12010730B2 (en) | Retransmission of MsgB in two-step random access procedure | |
EP3579446B1 (en) | Method for use in transmitting signal, terminal device, and network device | |
CN115941014A (en) | Transmission processing method, device and equipment | |
CN109831795B (en) | Method and device for sending random access leader sequence | |
US20200178186A1 (en) | Access Method And Access Device | |
CN114071552A (en) | Method for transmitting auxiliary information, terminal equipment and network equipment | |
CN110312322B (en) | Random access method and equipment for executing random access | |
WO2022117023A1 (en) | Random access method and apparatus, terminal, and network side device | |
US11212839B2 (en) | Method for random access and terminal device | |
CN113973270B (en) | Message sending and receiving methods, devices and communication equipment | |
CN114501664B (en) | Random access method, terminal equipment and network equipment | |
EP3557937A1 (en) | Signal transmission method, terminal device and network device | |
EP4301068A1 (en) | Method and device for indicating scs of initial downlink bwp | |
WO2022117022A1 (en) | Random access method, apparatus and device | |
CN114501669A (en) | Random access method, terminal equipment and network equipment | |
CN114071501A (en) | Downlink transmission method, downlink transmission device, terminal and network side equipment | |
CN115967993A (en) | Data receiving method, data transmitting method and terminal |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
GR01 | Patent grant | ||
GR01 | Patent grant |