CN110890909B - Beam searching method for 5G NR initial access process - Google Patents
Beam searching method for 5G NR initial access process Download PDFInfo
- Publication number
- CN110890909B CN110890909B CN201811044509.0A CN201811044509A CN110890909B CN 110890909 B CN110890909 B CN 110890909B CN 201811044509 A CN201811044509 A CN 201811044509A CN 110890909 B CN110890909 B CN 110890909B
- Authority
- CN
- China
- Prior art keywords
- user
- base station
- synchronous signal
- initial
- beam direction
- 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
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a method for preparing 5G NRA beam search method of an initial access procedure. The method comprises the following steps: in a cell searching stage, a base station scans M wave beam directions and sends a synchronous signal block in a period T, and a user scans wider N wave beam directions in N wave beams and detects the synchronous signal block to determine an initial wave beam direction; if N is equal to N, taking the initial beam direction as a data transmission beam direction; if N < N, then divide the initial beam into
Scanning each beam, detecting a synchronous signal block, and determining the beam direction of data transmission; in the random access phase, the base station detects random access preambles sent by the user at all possible physical random channel positions, and if the detection is successful, the channel is used as a beam direction for data transmission between the base station and the user. The invention can reduce the delay of the initial access process of the 5G NR system under the limited synchronous signal block overhead.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a beam searching method for a 5G NR initial access process.
Background
In order to support the emerging characteristics of ultra-wide bandwidth, ultra-low delay and the like, a fifth generation mobile communication (5G) New Radio (NR) network introduces a millimeter wave band as one of frequency bands and a beam forming technology. The initial access process is a process of establishing initial link connection between a user and a base station, and comprises a cell search stage and a random access stage, and is a key problem for designing a beamforming cellular system. In the existing cellular mobile communication system, a multi-antenna system mostly adopts a digital beam forming technology, and after an initial access process is successful, a user and a base station realize beam forming according to the calculation of channel state information. In 5G NR, an analog beamforming technology realized by a codebook is introduced at the same time, so that in an initial access stage, a user and a base station must determine a beam direction for data transmission by beam search, and the design of a beam search method needs to consider two performance indexes of initial access delay and system overhead.
The existing wave beam searching methods include an exhaustive searching method, an iterative searching method, a unilateral searching method and a searching method based on background information. In the 5G NR, a synchronization signal block has a mapping relationship with a physical random access channel, and the maximum delay of a base station detecting its own beam direction is fixed. The exhaustive search method is that a user traverses all the beam directions of the user to perform detection search to find the beam direction for data transmission, and the base station performs search on all possible physical random access channel positions to find the beam direction for data transmission with the user. The iterative search method is that the base station firstly scans the wide beam to carry out the first initial access with the user, and after the connection is established, the determined wide beam is subdivided into finer beams to carry out the second initial access, so that if the iterative search method is applied to the 5G NR, the initial access delay is larger than the exhaustive search, and the method only considers the situation of a single user and is not suitable for the situation of multiple users. The single-sided search method is that the base station first transmits an omnidirectional beam, the user traverses all the beam directions of the user to detect the beam direction for data transmission, then the user transmits a random access preamble in the detected beam direction, and the base station traverses all the directions to detect, so that the method cannot be applied to the 5G NR. The method comprises the steps that a user obtains the geographical position of the nearest NR base station by utilizing a macro base station and a GPS and performs an initial access process in the direction of a beam aligned with the geographical position, extra delay is introduced when the information of the macro base station and the GPS information are obtained, and the method can only be applied to a line-of-sight scene and is limited in application scene.
Disclosure of Invention
The invention aims to provide a beam searching method for a 5G NR initial access process, which can reduce the delay of the initial access process of a 5G NR system under the limited overhead of a synchronous signal block.
The technical solution for realizing the purpose of the invention is as follows: a beam searching method for a 5G NR initial access process is specifically as follows:
(1) the transmission period of a synchronous signal block set is T, and the number of the synchronous signal blocks which are contained in the synchronous signal block set at most is N SSB The number of wave beams of the base station is M, wherein M is less than or equal to N SSB The number of beams of the user is N;
(2) in a cell searching stage, in each transmission period T, a base station scans M wave beam directions and sends a synchronous signal block, a user scans N wave beam directions and detects the synchronous signal block, N is less than or equal to N, the size of a searching window is T, and after detection is successful, the wave beam direction with the largest detection energy is selected as an initial wave beam direction;
if N is equal to N, the initial beam direction is taken as a data transmission beam direction;
if N is less than N, the initial beam is divided into
Scanning the sub-beams, detecting a synchronous signal block, wherein the size of a search window is T, and after the detection is successful, selecting the sub-beam direction with the maximum detection energy as a data transmission beam direction by a user;
(3) in the random access stage, a user sends a random access preamble on a physical random access channel mapped with a detected synchronous signal block, a base station detects on all possible physical random access channels, and after the detection is successful, the channel is used as a beam direction for data transmission between the base station and the user.
Further, the base station scans M beam directions and sends a synchronization signal block, and the user scans n beam directions and detects the synchronization signal block, which is as follows:
the base station scans the M beams in any order, and the user also scans the n beams in any order.
Further, said splitting the initial beam
The sub-beams are scanned as follows:
in the second cell search stage, the user only needs to scan the direction of the initial beam
A beam, and can scan this in any order
And a beam.
Further, the physical random access channel mapped with the detected synchronization signal block in step 4 specifically refers to:
the mapping relation between the synchronous signal blocks and the physical random access channels is determined according to actual requirements, the physical random access channels have a plurality of sending moments in time domains and frequency domains, and the total M synchronous signal blocks of the base station are only associated with a specific number of physical random access channels in an association period.
Compared with the prior art, the invention has the following remarkable advantages: (1) selecting proper N according to the size of N, effectively reducing the detection delay of a cell search stage, thereby reducing the initial access delay; (2) the proper N is selected according to the size of the N, so that the total beam scanning times of the user are reduced, and the energy loss of the user in the initial access stage is reduced; (3) the system overhead is
The method is suitable for the beamforming scenes of all the base stations, and is suitable for line-of-sight scenes and non-line-of-sight scenes.
Drawings
Fig. 1 is a flowchart illustrating an initial 5G NR access procedure according to an embodiment of the present invention.
Fig. 2 is a diagram illustrating a beam direction and a synchronization information block mapping of a base station according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a beam searching method for a 5G NR initial access procedure according to the present invention, in which (a) is a schematic diagram corresponding to a line-of-sight scene, and (b) is a schematic diagram corresponding to a non-line-of-sight scene.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.
With reference to fig. 1 to 3, the beam search method for the 5G NR initial access procedure of the present invention includes the following steps:
(1) the transmission period of a synchronous signal block set is T, and the number of the synchronous signal blocks which are contained in the synchronous signal block set at most is N SSB The number of wave beams of the base station is M, wherein M is less than or equal to N SSB The number of beams of the user is N;
(2) in a cell searching stage, in each transmission period T, a base station scans M wave beam directions and sends a synchronous signal block, a user scans N wave beam directions and detects the synchronous signal block, N is less than or equal to N, the size of a search window is T, and after the detection is successful, the wave beam direction with the largest detection energy is selected as an initial wave beam direction;
if N is equal to N, taking the initial beam direction as a data transmission beam direction;
if N is less than N, the initial beam is divided into
Scanning the sub-beams, detecting a synchronous signal block, wherein the size of a search window is T, and after the detection is successful, selecting the sub-beam direction with the maximum detection energy as a data transmission beam direction by a user;
(3) in the random access stage, a user sends a random access preamble on a physical random access channel mapped with a detected synchronous signal block, a base station detects on all possible physical random access channels, and after the detection is successful, the channel is used as a beam direction for data transmission between the base station and the user.
Further, the base station scans M beam directions and sends a synchronization signal block, and the user scans n beam directions and detects the synchronization signal block, which is specifically as follows:
the base station scans the M beams in any order, and the user also scans the n beams in any order.
Further, said splitting the initial beam
The sub-beams are scanned as follows:
in the second cell search phase, the user only needs to scan in the direction of the initial beam
A beam, and can scan this in any order
And a beam.
Further, the physical random access channel mapped with the detected synchronization signal block in step 4 specifically refers to:
the mapping relation between the synchronous signal blocks and the physical random access channels is determined according to actual requirements, the physical random access channels have a plurality of sending moments in time domains and frequency domains, and the total M synchronous signal blocks of the base station are only associated with the physical random access channels with specific numbers in an association period.
Example 1
Referring to fig. 1, a flowchart of an initial access procedure of the 5G NR applied in the present embodiment is shown. During the initial access phase, the base station and the user must determine the beam direction that each other uses for data transmission. In the cell search phase, the user determines the beam direction used by the user for data transmission by detecting the synchronization signal block sent by the base station. In the random access phase, the base station determines the beam direction of the base station for data transmission with the user by detecting the random access preamble sent by the user.
In this embodiment, the transmission period of one set of sync signal blocks is T ═ 20 ms, and the upper limit of the sync signal blocks in the set is N SSB 64, that is, the number of beams scanned by the base station in different directions is at most 64, the number of beams of the base station is M-16, and the number of beams of the user is N-8; in each transmission period, the beams scanned by the base stationThe mapping relationship between the direction and each synchronization signal block in the synchronization signal block set is shown in fig. 2, and it can be seen that the beam scanning sequence of the base station adopts a clockwise increasing sequence, and the synchronization signal block establishes a unique mapping relationship with each beam direction according to the clockwise increasing sequence.
The beam search process of this embodiment is shown in fig. 3, and includes the following steps:
And 4, the user can acquire the index number of the synchronous signal block by demodulating the detected physical broadcast signal in the synchronous information block so as to acquire the time-frequency position of the physical random access channel mapped with the synchronous signal block. In the random access phase, a user sends a random access preamble code on the physical random access channel, the base station detects the preamble code on all possible physical random channel positions, if the detection is successful, the base station indicates that the user requests communication, and the beam direction associated with the synchronous signal block mapped with the physical random access channel is taken as the direction for carrying out data transmission with the user. As shown in fig. 3(a) - (b), in the line-of-sight scenario, the base station will determine beam direction # 5 as the beam direction for data transmission with the user; in a non-line-of-sight scenario, the base station will determine beam direction # 4 as the beam direction for data transmission with that user.
In conclusion, the beam searching method for the 5G NR initial access process can effectively reduce the detection delay in the cell searching stage, thereby reducing the initial access delay; the total beam scanning times of the user can be reduced, and the energy loss of the user in the initial access stage is reduced; the system overhead is small, and the method is suitable for the beamforming fields of all base stations, and is suitable for line-of-sight scenes and non-line-of-sight scenes.
Claims (3)
1. A beam searching method for a 5G NR initial access process is characterized by comprising the following steps:
(1) the transmission period of a synchronous signal block set is T, and the number of the synchronous signal blocks which are contained in the synchronous signal block set at most is N SSB The number of wave beams of the base station is M, wherein M is less than or equal to N SSB The number of beams of the user is N;
(2) in a cell searching stage, in each transmission period T, a base station scans M wave beam directions and sends a synchronous signal block, a user scans N wave beam directions and detects the synchronous signal block, N is less than or equal to N, the size of a search window is T, and after the detection is successful, the wave beam direction with the largest detection energy is selected as an initial wave beam direction;
if N is equal to N, taking the initial beam direction as a data transmission beam direction;
if N is less than N, the initial beam is divided into
Scanning the sub-beams, detecting a synchronous signal block, wherein the size of a search window is T, and after the detection is successful, selecting the sub-beam direction with the maximum detection energy as a data transmission beam direction by a user;
(3) in the random access stage, a user sends a random access lead code on a physical random access channel mapped with a detected synchronous signal block, a base station detects on all possible physical random access channels, and after the detection is successful, the channel is used as a beam direction for data transmission between the base station and the user;
said dividing the initial beam into
The sub-beams are scanned as follows:
in the second cell search stage, the user only needs to scan the direction of the initial beam
A beam, and can scan this in an arbitrary order
And a beam.
2. The method of claim 1, wherein the base station scans M beam directions and transmits synchronization signal blocks, and the user scans n beam directions and detects synchronization signal blocks, specifically as follows:
the base station scans the M beams in any order, and the user also scans the n beams in any order.
3. The beam searching method for 5G NR initial access procedure as claimed in claim 1, wherein the physical random access channel mapped with the detected synchronization signal block in step 4 specifically refers to:
the mapping relation between the synchronous signal blocks and the physical random access channels is determined according to actual requirements, the physical random access channels have a plurality of sending moments in time domains and frequency domains, and the total M synchronous signal blocks of the base station are only associated with a specific number of physical random access channels in an association period.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811044509.0A CN110890909B (en) | 2018-09-07 | 2018-09-07 | Beam searching method for 5G NR initial access process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811044509.0A CN110890909B (en) | 2018-09-07 | 2018-09-07 | Beam searching method for 5G NR initial access process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110890909A CN110890909A (en) | 2020-03-17 |
| CN110890909B true CN110890909B (en) | 2022-09-27 |
Family
ID=69744631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811044509.0A Active CN110890909B (en) | 2018-09-07 | 2018-09-07 | Beam searching method for 5G NR initial access process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110890909B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114285453A (en) * | 2020-10-01 | 2022-04-05 | 北京九天微星科技发展有限公司 | Wave beam management method in satellite communication system |
| CN116686229A (en) * | 2021-02-03 | 2023-09-01 | 华为技术有限公司 | Sensing-based device detection |
| CN115413033A (en) * | 2021-05-28 | 2022-11-29 | 华为技术有限公司 | Beam training method, communication method and terminal equipment |
| CN115913464A (en) * | 2022-11-30 | 2023-04-04 | 中国星网网络创新研究院有限公司 | SSB scanning method, device, equipment and computer storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106533557A (en) * | 2016-10-28 | 2017-03-22 | 陕西尚品信息科技有限公司 | Beam-forming-technology-based method for reducing millimeter-wave communication energy losses |
| CN106856611A (en) * | 2015-12-08 | 2017-06-16 | 中兴通讯股份有限公司 | Wave beam processing method, initial beam find method and base station and terminal |
| CN107888237A (en) * | 2016-09-30 | 2018-04-06 | 北京三星通信技术研究有限公司 | It is initially accessed the method, base station equipment and user equipment with Stochastic accessing |
| CN108075817A (en) * | 2016-11-11 | 2018-05-25 | 北京三星通信技术研究有限公司 | A kind of searching method in wave beam forming direction and base station |
| CN108282902A (en) * | 2017-01-06 | 2018-07-13 | 北京三星通信技术研究有限公司 | Accidental access method, base station and user equipment |
-
2018
- 2018-09-07 CN CN201811044509.0A patent/CN110890909B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106856611A (en) * | 2015-12-08 | 2017-06-16 | 中兴通讯股份有限公司 | Wave beam processing method, initial beam find method and base station and terminal |
| CN107888237A (en) * | 2016-09-30 | 2018-04-06 | 北京三星通信技术研究有限公司 | It is initially accessed the method, base station equipment and user equipment with Stochastic accessing |
| CN106533557A (en) * | 2016-10-28 | 2017-03-22 | 陕西尚品信息科技有限公司 | Beam-forming-technology-based method for reducing millimeter-wave communication energy losses |
| CN108075817A (en) * | 2016-11-11 | 2018-05-25 | 北京三星通信技术研究有限公司 | A kind of searching method in wave beam forming direction and base station |
| CN108282902A (en) * | 2017-01-06 | 2018-07-13 | 北京三星通信技术研究有限公司 | Accidental access method, base station and user equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110890909A (en) | 2020-03-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110890909B (en) | Beam searching method for 5G NR initial access process | |
| Giordani et al. | Initial access in 5G mmWave cellular networks | |
| CN107612602B (en) | Wave beam recovery method and device of millimeter wave communication system | |
| CN1129245C (en) | Method and appts. for providing time adjustment to wireless communication system | |
| KR102058027B1 (en) | Methods and apparatus for uplink timing alignment in system with large number of antennas | |
| US20230014511A1 (en) | Communication device and method for low-latency initial access to non-standalone 5g new radio network | |
| EP1686700B1 (en) | Multiple input and multiple output communication apparatus and channel scanning method thereof | |
| CN101064561B (en) | Method for realizing uplink synchronization during inter-cell switch process | |
| US20060286945A1 (en) | Inter-frequency handover for multiple antenna wireless transmit/receive units | |
| CN106487437B (en) | High-frequency synchronization realization method, system and device based on wide and narrow beam access | |
| CN106797362A (en) | For cell search in wireless network and the signal format of synchronization | |
| EP3552457B1 (en) | System and method for fast system acquisition and channel estimation | |
| US8224240B2 (en) | Method and apparatus for implementing beam forming in CDMA communication system | |
| RU2658187C2 (en) | Method and device for processing random access preamble | |
| RU2141176C1 (en) | Device and method for analog mobile telephone communication system | |
| US20070104176A1 (en) | System and method for pilot signal utilization in an environment using dynamic frequency assignment | |
| US20120170505A1 (en) | Method, Device and System for a Relay to Establish a Connection with a Base Station | |
| EP2180743B1 (en) | Virtual base station and method thereof | |
| CN110691413A (en) | Method and equipment for transmitting residual minimum system information control resource set | |
| CN101431781B (en) | Radio communication system and its switching method and apparatus | |
| US20200068480A1 (en) | Radio access method, apparatus, system, and computer storage medium | |
| CN112839304A (en) | Communication method and device | |
| US20230283417A1 (en) | Inter-band carrier aggregation with independent beam management | |
| US20030224829A1 (en) | Method and system for determining antenna of radio base station at moving target area during handover | |
| CN107438240A (en) | To the optimization method of network node sending method in network integration discovery procedure |
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 |