CN111988830B - Method and device for transmitting initial access terminal synchronization signal and system information - Google Patents
Method and device for transmitting initial access terminal synchronization signal and system information Download PDFInfo
- Publication number
- CN111988830B CN111988830B CN201910434950.8A CN201910434950A CN111988830B CN 111988830 B CN111988830 B CN 111988830B CN 201910434950 A CN201910434950 A CN 201910434950A CN 111988830 B CN111988830 B CN 111988830B
- Authority
- CN
- China
- Prior art keywords
- carrier
- broadcast
- signal
- synchronization signal
- synchronous
- 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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The embodiment of the application provides a method and a device for transmitting an initial access terminal synchronizing signal and system information, wherein the method comprises the following steps: receiving a synchronization signal and system broadcast information, wherein the synchronization signal is sent on a synchronization signal carrier wave, and the system broadcast information is sent on a broadcast carrier wave; analyzing the synchronous signal to obtain the position of the broadcast carrier in the frequency domain; receiving the system broadcast information on a broadcast carrier. The application also provides a device suitable for the method. Compared with the signal transmission method and device of the traditional LTE230 system, the method and device have the advantage that the signal transmission method and device are not easily interfered.
Description
Technical Field
The present application relates to the field of mobile communications technologies, and in particular, to a method and an apparatus for transmitting a synchronization signal and system information for an initial access terminal.
Background
Currently, the power distribution and utilization network mostly adopts GPRS and CDMA services provided by leased telecommunication operators as wireless communication means for information acquisition and other services. Although the public network does not need network deployment and later maintenance, and only needs to pay lease fees to operators, the network with public voice communication and data service as the highest priority cannot meet the requirements of power service information safety, instantaneity and service quality all the time. Therefore, the construction of the wireless private network becomes an inevitable trend of the development of the smart grid power communication.
The LTE230 system is a wireless private network communication system working in a 230MHz frequency band, and the characteristic of long coverage distance of a low frequency band makes the LTE230 system superior to other systems in network establishment and later maintenance costs. In addition, in terms of frequency usage policy, the national radio regulatory commission has granted 40 dedicated frequency points to the power industry for the 230MHz frequency band. Therefore, the LTE230 system has good popularization and application values in the field of power distribution and utilization by combining the 4G LTE advanced technology and the wide coverage advantage based on the natural advantages of the frequency use policy in the power industry.
The existing LTE230 system scheme continues to use the LTE technical scheme in terms of design of air interface synchronization signals and system information, and a fixed carrier is selected for a cell system to transmit synchronization signals and system broadcast information MIB. There may be systems of other industries working around the working frequency point, so as to cause random interference to the LTE230 system, and once the synchronization channel and the system broadcast information are interfered, for the initially accessed terminal, the cell synchronization channel cannot be successfully detected, so that the system broadcast information cannot be successfully obtained, and finally the initially accessed terminal cannot be successfully accessed to the network.
Disclosure of Invention
The application provides a method and a device for transmitting a synchronization signal and system information of an initial access terminal, and solves the problem that an LTE230 system in the prior art is easily interfered by other systems in adjacent frequency bands.
The embodiment of the application adopts the following technical scheme:
the embodiment of the application provides a method for transmitting an initial access terminal synchronizing signal and system information, which comprises the following steps: receiving a synchronization signal and system broadcast information, wherein the synchronization signal is sent on a synchronization signal carrier wave, and the system broadcast information is sent on a broadcast carrier wave; analyzing the synchronous signal to obtain the position of the broadcast carrier in the frequency domain; receiving the system broadcast information on a broadcast carrier.
Preferably, the synchronization signal carrier includes a first synchronization signal carrier and a second synchronization signal carrier, and the synchronization signal is transmitted on the first synchronization signal carrier and the second synchronization signal carrier; the broadcast carriers comprise a first broadcast carrier and a second broadcast carrier, and the system broadcast information is sent on the first broadcast carrier and the second broadcast carrier; analyzing a synchronous signal sent by a first synchronous signal carrier to obtain the position of the first broadcast carrier in a frequency domain; and analyzing the synchronous signal sent by the second synchronous signal carrier to obtain the position of the second broadcast carrier in the frequency domain.
Preferably, the synchronization signal carrier includes a first synchronization signal carrier and a second synchronization signal carrier, and the synchronization signal is transmitted on the first synchronization signal carrier and the second synchronization signal carrier; and analyzing the synchronous signals on the first synchronous signal carrier and the second synchronous signal carrier to obtain the same physical layer cell identification, and obtaining the position of the broadcast carrier corresponding to the physical layer cell identification in the frequency domain through a mapping table.
Preferably, the analyzing the first synchronization signal to obtain the position of the first broadcast carrier in the frequency domain, and the analyzing the second synchronization signal to obtain the position of the second broadcast carrier in the frequency domain further include: analyzing the first synchronous signal to obtain a first physical layer cell identification, and obtaining the position of a first broadcast carrier in a frequency domain through a mapping table; and analyzing the second synchronous signal to obtain a second physical layer cell identifier, and obtaining the position of the second broadcast carrier in the frequency domain through a mapping table.
Preferably, there are N broadcast carriers corresponding to the physical layer cell identifier in the mapping table, where N is an integer not less than 1.
Preferably, the analyzing the synchronization signal to obtain the physical layer cell identifier is obtained according to a cyclic shift calculation of the synchronization signal sequence.
Preferably, the system broadcast information on the broadcast carrier includes a logical cell identifier, and the logical cell identifier uniquely identifies one cell in the system.
Optimally, the synchronization signals comprise a primary synchronization signal and a secondary synchronization signal, the primary synchronization signal is used for timing and frequency synchronization, and the secondary synchronization signal is used for fine synchronization; the primary synchronization signal and the secondary synchronization signal are also used to indicate a portion of a physical cell ID.
The embodiment of the present application further provides an initial access terminal synchronization signal and system information transmission apparatus, including: synchronization signal analysis unit, broadcast signal receiving unit: the synchronous signal analysis unit is used for receiving synchronous signals, analyzing the synchronous signals, acquiring the position of a broadcast carrier in a frequency domain, and sending the position to the broadcast signal receiving unit; the broadcast signal receiving unit is used for receiving system broadcast information on a broadcast carrier wave.
The embodiment of the present application further provides an initial access terminal synchronization signal and system information transmission apparatus, including: synchronization signal generation unit, broadcast signal generation unit, signal transmission unit: the synchronous signal generating unit is used for generating a synchronous signal; the broadcast signal generating unit is used for generating system broadcast information; the signal transmitting unit is used for transmitting the synchronous signal and the system broadcast information.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects: compared with the signal transmission method and device of the traditional LTE230 system, the method and device have the advantage that the signal transmission method and device are not easily interfered.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a diagram illustrating the allocation of 230MHz spectrum in China;
FIG. 2 is a flow chart of a basic embodiment of the method of the present invention;
FIG. 3 is a flow chart of a first preferred embodiment of the method of the present invention;
fig. 4 is a schematic diagram of carrier channel division of the first preferred embodiment of the method of the present invention;
FIG. 5 is a flow chart of a second preferred embodiment of the method of the present invention;
fig. 6 is a schematic diagram of carrier channel division of a second preferred embodiment of the method of the present invention;
FIG. 7 is a flow chart of a third preferred embodiment of the method of the present invention;
fig. 8 is a schematic diagram of carrier channel division of a third preferred embodiment of the method of the present invention;
fig. 9 is a schematic diagram of the division of multiple carrier channels corresponding to cell ids in the second and third preferred embodiments of the method of the present invention;
FIG. 10 is a schematic structural diagram of an embodiment of a device terminal according to the present invention;
fig. 11 is a schematic structural diagram of an embodiment of a base station of the apparatus of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
At present, the power distribution and utilization network mostly adopts GPRS and CDMA services provided by leased telecommunication operators as wireless communication means of services such as information acquisition and the like. Although the public network does not need network deployment and later maintenance, and only needs to pay lease fees to operators, the network with public voice communication and data service as the highest priority cannot meet the requirements of power service information safety, instantaneity and service quality all the time. Therefore, the construction of a wireless private network is an inevitable trend of the development of smart grid power communication.
The LTE230 system is a wireless private network communication system working in a 230MHz frequency band, and the characteristic of long coverage distance of a low frequency band makes the LTE230 system superior to other systems in network establishment and later maintenance costs. In addition, in terms of frequency usage policy, the national radio regulatory commission has granted 40 dedicated frequency points to the power industry for the 230MHz frequency band. Therefore, the LTE230 system has good popularization and application values in the field of power distribution and utilization by combining the 4G LTE advanced technology and the wide-coverage advantage based on the natural advantages of the frequency use policy in the power industry.
In the existing LTE230 system scheme, an LTE technical scheme is adopted in the design of an air interface synchronization signal and system information, and a fixed carrier is selected for a cell system to transmit a synchronization signal and a system broadcast information MIB. There may be systems of other industries working around the working frequency point, so as to cause random interference to the LTE230 system, and once the synchronization channel and the system broadcast information are interfered, for the initially accessed terminal, the cell synchronization channel cannot be successfully detected, so that the system broadcast information cannot be successfully obtained, and finally the initially accessed terminal cannot be successfully accessed to the network.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of the allocation situation of 230MHz spectrum in our country. The existing LTE230 system scheme continues to use the LTE technical scheme in terms of design of air interface synchronization signals and system information, and a fixed carrier is selected for a cell system to transmit synchronization signals and system broadcast information MIB. There may be systems of other industries working around the frequency point where they work, causing random interference to the LTE230 system. The different shades of gray in the figure represent authorized carriers assigned to different industries and the white represents available carriers not explicitly assigned to a particular industry occupancy, each carrier being 25kHz wide. Future LTE230 systems may use either dedicated carriers that are not allocated to the power industry (the "hot" word portion of the figure) or idle carriers that are not specifically allocated for use by each particular industry (the white portion of the figure).
FIG. 2 is a flow chart of a basic embodiment of the method of the present invention. The method for transmitting the synchronization signal and the system information aiming at the initial access terminal comprises the following steps:
step 11: receiving a synchronization signal and system broadcast information, the synchronization signal being transmitted on a synchronization signal carrier and the system broadcast information being transmitted on a broadcast carrier.
The base station transmits information including a synchronization signal and system broadcast information to the terminal. The synchronization signals are sent on a synchronization signal carrier, the synchronization signals of the LTE system comprise primary synchronization signals PSS and secondary synchronization signals SSS, the primary synchronization signals are used for timing and frequency synchronization, the secondary synchronization signals are used for fine synchronization, and the lower 6 bits of the frame number are indicated. The primary and secondary synchronization signals are also used to indicate a portion of the physical cell ID. The communication terminal equipment can perform downlink synchronization and cell search based on the information of the synchronization signal, acquire part of the physical layer cell identification PCI and part of the frame number index, and acquire the cell identity identification of the remaining part and the frame number index of the remaining part based on the physical broadcast channel. The system broadcast information MIB contains necessary configuration information required by the terminal to access the system, configuration information indicating to receive other system information, indication information indicating whether the cell is in an operating state, and the like.
For example, the base station sends information to the terminal, where the information includes a synchronization signal and system broadcast information. Each carrier channel has a frequency width of, for example, 25kHz, and the synchronization signal and the system broadcast information are transmitted on a synchronization signal carrier and a broadcast carrier, respectively, which have a certain positional relationship, for example, 1 channel apart. The synchronization signals include a primary synchronization signal PSS and a secondary synchronization signal SSS, which collectively indicate frequency information of the broadcast carrier and a physical layer cell identity PCI. By parsing the synchronization signal, the terminal can acquire frequency information of the broadcast carrier, thereby receiving system broadcast information.
Step 12: and analyzing the synchronous signal to obtain the position of the broadcast carrier in the frequency domain.
The terminal receives the signal sent by the base station, analyzes the synchronous signal in the signal, and can acquire the characteristic information of the broadcast carrier, wherein the characteristic information can be the position of the broadcast carrier channel relative to the synchronous signal carrier channel, so that the position of the broadcast carrier in the frequency domain is further determined, and the system broadcast information is prepared to be received.
For example, the base station transmits information to the terminal, the frequency width of each carrier channel is, for example, 25kHz, and the synchronization signal and the system broadcast information are transmitted on the synchronization signal carrier and the broadcast carrier, respectively. The terminal analyzes the synchronous signal to obtain the relative position relationship between the synchronous signal carrier and the broadcast carrier, for example, the analyzed result is that the synchronous signal carrier and the broadcast carrier are separated by 1 channel, thereby further determining the position of the broadcast carrier in the frequency domain and preparing to receive the system broadcast information.
Step 13: receiving the system broadcast information on a broadcast carrier.
In step 12, the terminal determines the position of the broadcast carrier in the frequency domain, and further receives the information on the frequency to obtain system broadcast information MIB.
For example, in step 12, the terminal determines the location of the broadcast carrier in the frequency domain, and may receive the system broadcast information MIB information, and then may configure itself according to the configuration information indicated in the system broadcast information MIB.
Fig. 3 is a flow chart of a first preferred embodiment of the method of the present invention. The application provides a method for transmitting a synchronization signal and system information aiming at an initial access terminal, which comprises the following steps:
step 21: receiving a synchronization signal and system broadcast information, the synchronization signal being transmitted on a synchronization signal carrier and the system broadcast information being transmitted on a broadcast carrier. The synchronous signal carrier comprises a first synchronous signal carrier and a second synchronous signal carrier, and the synchronous signal is sent on the first synchronous signal carrier and the second synchronous signal carrier; the broadcast carriers include a first broadcast carrier and a second broadcast carrier, and the system broadcast information is sent on the first broadcast carrier and the second broadcast carrier.
The base station transmits information including a synchronization signal and system broadcast information to the terminal. The synchronization signals are sent on a synchronization signal carrier, the synchronization signals of the LTE system comprise primary synchronization signals PSS and secondary synchronization signals SSS, the primary synchronization signals are used for timing and frequency synchronization, the secondary synchronization signals are used for fine synchronization, and the lower 6 bits of the frame number are indicated. Two synchronous signal carriers and two broadcast carriers are set during sending, synchronous signals are sent on the first synchronous signal carrier and the second synchronous signal carrier respectively, and the synchronous signals sent by the two carriers are completely the same; the system broadcast information MIB is respectively transmitted on a first broadcast carrier and a second broadcast carrier, and the system broadcast information MIB transmitted by the two carriers is completely the same. The positions of the synchronous signal carrier and the broadcast carrier on the frequency domain have a fixed corresponding relation. When one of the synchronization signal carrier or the broadcast carrier is interfered, the other carrier can be switched to receive.
For example, as shown in fig. 4, fig. 4 is a schematic diagram of carrier channel division of the first preferred embodiment of the method of the present invention. The base station transmits information including a synchronization signal and system broadcast information MIB to the terminal, and the frequency width of each carrier channel is, for example, 25kHz. The synchronization signals include a primary synchronization signal PSS and a secondary synchronization signal SSS, which together indicate frequency information of the broadcast carrier and a physical layer cell identity PCI, for example, transmitted on carrier 2 and carrier n +1, and the synchronization signal sequences transmitted by the two carriers are identical. The system broadcast information MIB is transmitted on, for example, carrier 4 and carrier n +3, and the system broadcast information MIB transmitted by both carriers is identical. The positional relationship between the synchronization signal carrier and the broadcast carrier is spaced by 1 channel. By parsing the synchronization signal, the terminal can acquire frequency information of the broadcast carrier, thereby receiving system broadcast information MIB.
Step 22: analyzing a synchronous signal sent by a first synchronous signal carrier to obtain the position of the first broadcast carrier in a frequency domain; and analyzing the synchronous signal sent by the second synchronous signal carrier to obtain the position of the second broadcast carrier in the frequency domain.
The terminal receives the signal sent by the base station, analyzes the synchronous signal in the signal, and can acquire the characteristic information of the broadcast carrier, wherein the characteristic information can be the position of the broadcast carrier channel relative to the synchronous signal carrier channel, so that the position of the broadcast carrier in the frequency domain is further determined, and the system broadcast information is prepared to be received. The terminal analyzes the synchronous signal sent by the first synchronous signal carrier to obtain the position of the first broadcast carrier in the frequency domain; and the terminal analyzes the synchronous signal sent by the second synchronous signal carrier to obtain the position of the second broadcast carrier in the frequency domain. The terminal successfully detects any one of the synchronization channels and can analyze the frequency information of one broadcast carrier. When one of the synchronization signal carrier or the broadcast carrier is interfered, the other carrier can be switched to receive.
As shown in fig. 4, for example, the frequency width of each carrier channel is, for example, 25kHz, and the synchronization signal and the system broadcast information are transmitted on the synchronization signal carrier and the broadcast carrier, respectively. The synchronization signal is transmitted on carrier 2 and carrier n +1, for example, and the system broadcast information MIB is transmitted on carrier 4 and carrier n +3, for example, with a positional relationship between the synchronization signal carrier and the broadcast carrier being spaced by 1 channel. The terminal successfully detects any one of the synchronization channels and can analyze the frequency information of one broadcast carrier. The terminal analyzes the synchronous signal sent by the carrier 2, and the obtained broadcast carrier frequency is the carrier 4; the terminal analyzes the synchronization signal sent by the carrier n +1, and the obtained broadcast carrier frequency is the carrier n +3.
Step 23: receiving system broadcast information on the first broadcast carrier and/or the second broadcast carrier.
In step 22, the terminal successfully detects the first synchronization signal carrier and/or the second synchronization signal carrier, and may parse frequency information of one broadcast carrier, so as to receive the system broadcast information MIB on at least one of the first broadcast carrier and the second broadcast carrier. When one of the synchronous signal carrier or the broadcast carrier is interfered, the other carrier can be switched to receive.
For example, as shown in fig. 4, the terminal analyzes the synchronization signal sent by the carrier 2, and the available broadcast carrier frequency is the carrier 4; the terminal analyzes the synchronization signal sent by the carrier n +1, and the obtained broadcast carrier frequency is the carrier n +3. When the terminal successfully detects any synchronous channel, the frequency information of a broadcast carrier can be analyzed, and the system broadcast information MIB on the analyzed broadcast carrier is received.
Fig. 5 is a flow chart of a second preferred embodiment of the method of the present invention. The application provides a method for transmitting a synchronization signal and system information aiming at an initial access terminal, which comprises the following steps:
step 31: and receiving and transmitting a synchronous signal and system broadcast information, wherein the synchronous signal is transmitted on a synchronous signal carrier, and the system broadcast information is transmitted on a broadcast carrier. The synchronization signal carriers include a first synchronization signal carrier and a second synchronization signal carrier, and the synchronization signals are transmitted on the first synchronization signal carrier and the second synchronization signal carrier.
The base station transmits information including a synchronization signal and system broadcast information to the terminal. The synchronization signals are sent on a synchronization signal carrier, the synchronization signals of the LTE system comprise primary synchronization signals PSS and secondary synchronization signals SSS, the primary synchronization signals are used for timing and frequency synchronization, the secondary synchronization signals are used for fine synchronization, and the lower 6 bits of the frame number are indicated. Two synchronous signal carriers and two broadcast carriers are set during sending, synchronous signals are sent on the first synchronous signal carrier and the second synchronous signal carrier respectively, and the synchronous signals sent by the two carriers are completely the same; only one broadcast carrier is set, and the system broadcast information MIB is transmitted on the broadcast carrier. The information indicated by the synchronization signal is a physical layer cell identity PCI, and the position of the broadcast carrier on the frequency domain can be obtained through a mapping table. When one of the synchronous signal carriers is interfered, the other carrier can be switched to receive.
For example, as shown in fig. 6, fig. 6 is a schematic diagram of carrier channel division of the second preferred embodiment of the method of the present invention. The base station transmits information including a synchronization signal and system broadcast information MIB to the terminal, and the frequency width of each carrier channel is, for example, 25kHz. The synchronization signals include a primary synchronization signal PSS and a secondary synchronization signal SSS, which together indicate a physical layer cell identity PCI, e.g. transmitted on carrier 2 and carrier n +1, the synchronization signal sequences transmitted by both carriers being identical. The system broadcast information MIB is transmitted, for example, on carrier 4. By analyzing the synchronization signal, the terminal can obtain the physical layer cell identity (PCI), thereby obtaining the position of the broadcast carrier on the frequency domain.
Step 32: and analyzing the synchronous signals on the first synchronous signal carrier and the second synchronous signal carrier to obtain the same physical layer cell identification, and obtaining the position of the broadcast carrier corresponding to the physical layer cell identification in the frequency domain through a mapping table.
The terminal receives a signal sent by the base station, analyzes a synchronous signal in the signal, and can acquire the characteristic information of the broadcast carrier, wherein the characteristic information can be physical layer cell identifiers (PCI), and each physical layer cell identifier (PCI) corresponds to one broadcast carrier position through a preset mapping table. The synchronous signals sent by the first synchronous signal carrier and the second synchronous signal carrier are completely the same sequence, the terminal analyzes the synchronous signals sent by the first synchronous signal carrier and the second synchronous signal carrier to obtain the same physical layer cell identification PCI, the position of the broadcast carrier corresponding to the physical layer cell identification PCI in the frequency domain can be obtained through a preset mapping table, and each physical layer cell identification PCI corresponds to the determined broadcast carrier frequency information. When one of the synchronous signal carriers is interfered, the other carrier can be switched to receive.
As shown in fig. 6, for example, the frequency width of each carrier channel is, for example, 25kHz, and the synchronization signal and the system broadcast information are transmitted on the synchronization signal carrier and the broadcast carrier, respectively. The synchronization signals are transmitted, for example, on carrier 2 and carrier n +1, and the system broadcast information MIB is transmitted, for example, on carrier 4. The terminal analyzes the synchronization signal sent by the carrier 2 or the carrier n +1, the sequences of the synchronization signals are the same, and the same physical layer cell identifier, such as PCI1, is obtained after the analysis. Through the mapping table, it can be found that the broadcast carrier position corresponding to PCI1 is carrier 4.
Step 33: receiving the system broadcast information on a broadcast carrier.
In step 32, the terminal successfully detects any one of the first synchronization signal carrier or the second synchronization signal carrier, analyzes the physical layer cell identifier PCI, and obtains the frequency information of the broadcast carrier corresponding to the physical layer cell identifier PCI through the mapping table, thereby receiving the system broadcast information MIB on the carrier.
As shown in fig. 6, for example, synchronization signals are transmitted on carrier 2 and carrier n +1, and system broadcast information MIB is transmitted on carrier 4, for example. The terminal analyzes the synchronization signal sent by any one of the carrier 2 or the carrier n +1, and after the analysis, the same physical layer cell identifier, for example, PCI1, can be obtained. Through the mapping table, it can be found that the broadcast carrier position corresponding to the PCI1 is the carrier 4, and further, the system broadcast information MIB sent by the carrier 4 is received.
Fig. 7 is a flow chart of a fourth preferred embodiment of the method of the present invention. The application provides a method for transmitting a synchronization signal and system information aiming at an initial access terminal, which comprises the following steps:
step 41: receiving a synchronization signal and system broadcast information, the synchronization signal being transmitted on a synchronization signal carrier and the system broadcast information being transmitted on a broadcast carrier. The synchronous signal carrier comprises a first synchronous signal carrier and a second synchronous signal carrier, and the synchronous signal is sent on the first synchronous signal carrier and the second synchronous signal carrier; the broadcast carriers include a first broadcast carrier and a second broadcast carrier, and the system broadcast information is sent on the first broadcast carrier and the second broadcast carrier.
The base station transmits information including a synchronization signal and system broadcast information to the terminal. The synchronization signals are sent on a synchronization signal carrier, the synchronization signals of the LTE system comprise primary synchronization signals PSS and secondary synchronization signals SSS, the primary synchronization signals are used for timing and frequency synchronization, the secondary synchronization signals are used for fine synchronization, and the lower 6 bits of the frame number are indicated. Two synchronous signal carriers and two broadcast carriers are set during transmission, synchronous signals are respectively transmitted on a first synchronous signal carrier and a second synchronous signal carrier, and the synchronous signals transmitted by the two carriers are different; the system broadcast information MIB is respectively transmitted on a first broadcast carrier and a second broadcast carrier, and the system broadcast information MIB transmitted by the two carriers is completely the same. When one of the synchronization signal carrier or the broadcast carrier is interfered, the other carrier can be switched to receive. The information indicated by the synchronization signal is a physical layer cell identity PCI, and the position of the broadcast carrier on the frequency domain can be obtained through a mapping table.
For example, as shown in fig. 8, fig. 8 is a schematic diagram of carrier channel division of the fourth preferred embodiment of the method of the present invention. The base station transmits information including a synchronization signal and system broadcast information MIB to the terminal, and the frequency width of each carrier channel is, for example, 25kHz. The synchronization signals include a primary synchronization signal PSS and a secondary synchronization signal SSS, which together indicate a physical layer cell identity PCI, and are transmitted on, for example, carrier 2 and carrier n +1, where synchronization signal sequences transmitted by the two carriers are different, carrier 2 transmits a first synchronization signal, and carrier n +1 transmits a second synchronization signal. The system broadcast information MIB is transmitted on carrier 4 and carrier n +3, for example. By analyzing the synchronization signal, the terminal can obtain the physical layer cell identity (PCI), thereby obtaining the position of the broadcast carrier on the frequency domain.
Step 42: analyzing the first synchronous signal to obtain a first physical layer cell identification, and obtaining the position of a first broadcast carrier in a frequency domain through a mapping table; and analyzing the second synchronous signal to obtain a second physical layer cell identifier, and obtaining the position of the second broadcast carrier in the frequency domain through a mapping table.
The terminal receives a signal sent by the base station, analyzes a synchronous signal in the signal, and can acquire the characteristic information of the broadcast carrier, wherein the characteristic information can be a physical layer cell identifier (PCI), and each physical layer cell identifier (PCI) corresponds to one broadcast carrier position through a preset mapping table. The synchronous signals sent by the first synchronous signal carrier and the second synchronous signal carrier are different sequences, the terminal analyzes the first synchronous signal to obtain a first physical layer cell identifier, the terminal analyzes the second synchronous signal to obtain a second physical layer cell identifier, the position of the broadcast carrier corresponding to the physical layer cell identifier PCI in the frequency domain can be obtained through a preset mapping table, and each physical layer cell identifier PCI corresponds to determined broadcast carrier frequency information.
As shown in fig. 8, for example, the frequency width of each carrier channel is, for example, 25kHz, and the synchronization signal and the system broadcast information are transmitted on the synchronization signal carrier and the broadcast carrier, respectively. The synchronization signals are transmitted, for example, on carrier 2 and carrier n +1, and the system broadcast information MIB is transmitted, for example, on carrier 4 and carrier n +3. The terminal analyzes the synchronous signal sent by the carrier 2 to obtain the physical layer cell identifier such as PCI1; the terminal analyzes the synchronization signal sent by the carrier n +1 to obtain the physical layer cell identifier, for example, PCI2. Through the mapping table, it can be found that the broadcast carrier position corresponding to PCI1 is carrier 4, and the broadcast carrier position corresponding to PCI2 is carrier n +3.
Step 43: receiving system broadcast information on the first broadcast carrier and/or the second broadcast carrier.
In step 42, the terminal successfully detects any one (or at least one) of the first synchronization signal carrier or the second synchronization signal carrier, parses out the physical layer cell identifier PCI, and obtains the frequency information of the broadcast carrier corresponding to the physical layer cell identifier PCI through the mapping table, thereby receiving the system broadcast information MIB on at least one of the first broadcast carrier and the second broadcast carrier. When one of the synchronous signal carrier or the broadcast carrier is interfered, the other carrier can be switched to receive.
For example, as shown in fig. 8, the synchronization signal is transmitted on carrier 2 and carrier n +1, for example, and the system broadcast information MIB is transmitted on carrier 4 and carrier n +3, for example. The terminal analyzes the synchronous signal sent by the carrier 2 to obtain the physical layer cell identifier such as PCI1; the terminal analyzes the synchronization signal sent by the carrier n +1 to obtain the physical layer cell identifier, for example, PCI2. Through the mapping table, it can be found that the broadcast carrier position corresponding to PCI1 is carrier 4, and the broadcast carrier position corresponding to PCI2 is carrier n +3. The terminal can receive the system broadcast information MIB on any broadcast carrier.
Preferably, there are N broadcast carriers corresponding to the physical layer cell identifier in the mapping table, where N is an integer not less than 1.
In the second and third preferred embodiments, the mapping tables are preset, each physical layer cell identifier PCI in the mapping tables may correspond to one or more broadcast carriers, the terminal analyzes the physical layer cell identifier PCI to obtain a plurality of broadcast carrier frequencies, the system broadcast information MIB sent by each broadcast carrier is the same, the system broadcast information MIB may be obtained as long as receiving on any broadcast carrier, and when one broadcast carrier is interfered, the system broadcast information MIB may be switched to another broadcast carrier to receive.
For example, as shown in fig. 9, fig. 9 is a schematic diagram of dividing a cell id of the second and fourth preferred embodiments of the method of the present invention into multiple carrier channels. The terminal analyzes the received synchronous signal to obtain a physical layer cell identifier PCI1, and broadcast carriers corresponding to the PCI1 in the mapping table are a carrier 4 and a carrier n +3, so that the terminal can receive system broadcast information MIB on any one of the two carriers.
Preferably, the analyzing the synchronization signal to obtain the physical layer cell identifier is obtained according to a cyclic shift calculation of the synchronization signal sequence.
The synchronization signals comprise primary synchronization signals PSS and secondary synchronization signals SSS, so that the communication terminal equipment can perform downlink synchronization and cell search based on the signals, acquire part of physical layer cell identification PCI and part of frame number indexes, and acquire the cell identity identification of the rest part and the frame number indexes of the rest part based on a physical broadcast channel. And the physical layer cell identification is obtained by calculation according to the cyclic shift condition of the synchronization signal sequence.
Preferably, the system broadcast information on the broadcast carrier includes a logical cell identifier, and the logical cell identifier uniquely identifies a cell in the system.
In order for a terminal to associate multiple physical layer cell identities PCI with a logical cell, the system transmits the logical cell identity via a system broadcast information MIB. A logical cell comprises a group of carriers combined as a carrier resource set of the logical cell, and transmission resources for transmitting synchronization signals and system broadcast information MIB of the logical cell are contained in the carrier resource set of the logical cell. The logical cell identity can uniquely identify one cell in the system, and the physical layer cell identity PCI can be reused in different logical cells in the system.
For example, as shown in fig. 9, fig. 9 is a schematic diagram of the division of the cell id corresponding to multiple carrier channels in the second and third preferred embodiments of the method of the present invention. In the figure, carrier 4 and carrier n +3 are broadcast carriers, and the transmitted system broadcast information MIB carries a logical cell identifier, which is, for example, logicCell _ ID =1.
Optimally, the synchronization signals comprise a primary synchronization signal and a secondary synchronization signal, the primary synchronization signal is used for timing and frequency synchronization, and the secondary synchronization signal is used for fine synchronization; the primary synchronization signal and the secondary synchronization signal are also used to indicate a portion of a physical cell ID.
For all of the above embodiments, the synchronization signals in the LTE system include primary synchronization signals PSS and secondary synchronization signals SSS. The primary synchronization signal PSS is used for timing and frequency synchronization. The secondary synchronization signal SSS is used for fine synchronization, indicating the lower 6 bits of the frame number. The primary synchronization signal PSS and the secondary synchronization signal SSS are also used to indicate a part of the physical cell ID. A total of 504 different physical cell IDs are used. A physical cell ID composed of
And &>
Unique definition: />
Fig. 10 is a schematic structural diagram of an embodiment of a device terminal according to the present invention. The apparatus for transmitting synchronization signal and system information for an initial access terminal provided by the embodiment of the application is used for a terminal device, and comprises: synchronization signal analysis section 101 and broadcast signal reception section 102: the synchronization signal analyzing unit 101 is configured to receive a synchronization signal, analyze the synchronization signal to obtain a position of a broadcast carrier in a frequency domain, and send the position to the broadcast signal receiving unit 102; the broadcast signal receiving unit 102 is configured to receive system broadcast information on a broadcast carrier.
Fig. 11 is a schematic structural diagram of an embodiment of a base station of the apparatus of the present invention. The embodiment of the present application further provides an apparatus for transmitting a synchronization signal and system information for an initial access terminal, which is used for a network device, and the apparatus includes: synchronization signal generation section 201, broadcast signal generation section 202, signal transmission section 203: the synchronization signal generating unit 201 is configured to generate a synchronization signal; the broadcast signal generating unit 202 is configured to generate system broadcast information; the signal transmitting unit 203 is configured to transmit a synchronization signal and system broadcast information.
The components described in the embodiment of fig. 10-11 operate in a specific manner as described in the embodiment of fig. 2-9. See the above description of each embodiment, specifically see steps 11-13, 21-23, 31-33, 41-43, which are not repeated here.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of other like elements in a process, method, article, or apparatus comprising the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art to which the present application pertains. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.
Claims (9)
1. A method for transmitting synchronization signal and system information of an initial access terminal is characterized by comprising the following steps:
receiving a synchronization signal and system broadcast information, wherein the synchronization signal is sent on a synchronization signal carrier wave, and the system broadcast information is sent on a broadcast carrier wave;
analyzing the synchronous signal to obtain the position of the broadcast carrier in the frequency domain;
receiving the system broadcast information on a broadcast carrier;
the synchronous signal carrier comprises a first synchronous signal carrier and a second synchronous signal carrier, and the synchronous signal is sent on the first synchronous signal carrier and the second synchronous signal carrier;
the broadcast carrier comprises a first broadcast carrier and a second broadcast carrier, and the system broadcast information is sent on the first broadcast carrier and the second broadcast carrier;
analyzing a synchronous signal sent by a first synchronous signal carrier to obtain the position of the first broadcast carrier in a frequency domain;
analyzing the synchronous signal sent by the second synchronous signal carrier to obtain the position of the second broadcast carrier in the frequency domain;
when one synchronous signal carrier is interfered, switching to another carrier for receiving;
when one of the broadcast carriers is interfered, the other broadcast carrier is switched to receive.
2. The method of claim 1,
and analyzing the synchronous signals on the first synchronous signal carrier and the second synchronous signal carrier to obtain the same physical layer cell identification, and obtaining the position of the broadcast carrier corresponding to the physical layer cell identification in the frequency domain through a mapping table.
3. The method of claim 1,
the analyzing the first synchronization signal to obtain the position of the first broadcast carrier in the frequency domain, and the analyzing the second synchronization signal to obtain the position of the second broadcast carrier in the frequency domain further include:
analyzing the first synchronous signal to obtain a first physical layer cell identification, and obtaining the position of a first broadcast carrier in a frequency domain through a mapping table;
and analyzing the second synchronous signal to obtain a second physical layer cell identifier, and obtaining the position of the second broadcast carrier in the frequency domain through a mapping table.
4. The method of any one of claims 2 or 3,
and N broadcast carriers corresponding to the physical layer cell identifier in the mapping table are provided, wherein N is an integer not less than 1.
5. The method of any one of claims 2 or 3,
and the physical layer cell identification obtained by analyzing the synchronous signal is obtained by calculating the cyclic shift of the synchronous signal sequence.
6. The method of claim 3,
the system broadcast information on the broadcast carrier includes a logical cell identifier that uniquely identifies a cell within the system.
7. The method according to any one of claims 1 to 3,
the synchronization signals comprise a primary synchronization signal and a secondary synchronization signal;
the primary synchronization signal is used for timing and frequency synchronization, and the secondary synchronization signal is used for fine synchronization.
8. An initial access terminal synchronization signal and system information transmission apparatus, which is used for a terminal device to implement the method of any one of claims 1 to 7, and is characterized by comprising: synchronization signal analysis unit, broadcast signal receiving unit:
the synchronous signal analysis unit is used for receiving synchronous signals, analyzing the synchronous signals, acquiring the position of a broadcast carrier in a frequency domain, and sending the position to the broadcast signal receiving unit;
the broadcast signal receiving unit is used for receiving system broadcast information on a broadcast carrier wave.
9. An initial access terminal synchronization signal and system information transmission apparatus, configured to enable a network device to implement the method of any one of claims 1 to 7, the method comprising: synchronization signal generation unit, broadcast signal generation unit, signal transmission unit:
the synchronous signal generating unit is used for generating a synchronous signal;
the broadcast signal generating unit is used for generating system broadcast information;
the signal transmitting unit is used for transmitting the synchronous signal and the system broadcast information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910434950.8A CN111988830B (en) | 2019-05-23 | 2019-05-23 | Method and device for transmitting initial access terminal synchronization signal and system information |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910434950.8A CN111988830B (en) | 2019-05-23 | 2019-05-23 | Method and device for transmitting initial access terminal synchronization signal and system information |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111988830A CN111988830A (en) | 2020-11-24 |
| CN111988830B true CN111988830B (en) | 2023-04-07 |
Family
ID=73436560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910434950.8A Active CN111988830B (en) | 2019-05-23 | 2019-05-23 | Method and device for transmitting initial access terminal synchronization signal and system information |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111988830B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106792564A (en) * | 2015-11-20 | 2017-05-31 | 中兴通讯股份有限公司 | The transmission method and device of a kind of system broadcast message |
| CN107689854A (en) * | 2016-08-05 | 2018-02-13 | 电信科学技术研究院 | Acquisition methods, sending method, terminal and the network transmitting-receiving node of system information |
| CN107734684A (en) * | 2016-08-12 | 2018-02-23 | 华为技术有限公司 | A kind of system information sending method and device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106507439B (en) * | 2016-10-28 | 2019-12-10 | 宇龙计算机通信科技(深圳)有限公司 | information transmission method, base station and terminal |
-
2019
- 2019-05-23 CN CN201910434950.8A patent/CN111988830B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106792564A (en) * | 2015-11-20 | 2017-05-31 | 中兴通讯股份有限公司 | The transmission method and device of a kind of system broadcast message |
| CN107689854A (en) * | 2016-08-05 | 2018-02-13 | 电信科学技术研究院 | Acquisition methods, sending method, terminal and the network transmitting-receiving node of system information |
| CN107734684A (en) * | 2016-08-12 | 2018-02-23 | 华为技术有限公司 | A kind of system information sending method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111988830A (en) | 2020-11-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102457856B (en) | A kind ofly realize based on CR method, the Apparatus and system that frequency moves | |
| AU2012319821B2 (en) | Wireless communication apparatus, wireless communication method, and wireless communication system | |
| US20100298031A1 (en) | Method for transmitting and receiving signals using multi-band radio frequencies | |
| CN108632984B (en) | Configuration and receiving method and device of common control channel | |
| CN109618413B (en) | Multi-service isolation method for electric power wireless private network system | |
| CN103298121B (en) | A kind of terminal frequency point maps and collocation method | |
| CN101489285B (en) | User equipment access method and system | |
| CN103220703A (en) | Measuring method, measuring equipment and measuring system of radio resource management | |
| US9204308B2 (en) | Radio System Configuration | |
| CN102461269A (en) | Apparatus and method for transmitting system information block in a broadband wireless communication system | |
| CN108243508A (en) | A kind of resource allocation method, method for sending information, base station and terminal | |
| CN105472651A (en) | Base station, user equipment and related method | |
| US11672022B2 (en) | Channel access method, access point and station | |
| CN107820263B (en) | Information configuration method and device | |
| CN103002587B (en) | Power determining method and device | |
| EP2502446B1 (en) | Method and apparatus for allocating femto cell information for handover in a wireless communication system | |
| JP5530507B2 (en) | Communications system | |
| CN109392047A (en) | The indicating means that subband switches in ofdm system | |
| US20110170510A1 (en) | Method, apparatus and system for mapping access point to cell | |
| CN102781030A (en) | Method and system for measuring carrier frequency information in wireless communication system | |
| CN111988830B (en) | Method and device for transmitting initial access terminal synchronization signal and system information | |
| CN113242608B (en) | NR signal shielding method and system based on random access | |
| US8514784B2 (en) | Method for processing downlink signal in sector portion and base station thereof | |
| CN105992260A (en) | Downlink common channel transmitting, receiving method and device | |
| CN106954263B (en) | Method and apparatus for configuring multi-band communication in narrowband internet of things |
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 |