CN107708208B - Signal sending method, receiving method, base station and terminal - Google Patents

Signal sending method, receiving method, base station and terminal Download PDF

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Publication number
CN107708208B
CN107708208B CN201610643165.XA CN201610643165A CN107708208B CN 107708208 B CN107708208 B CN 107708208B CN 201610643165 A CN201610643165 A CN 201610643165A CN 107708208 B CN107708208 B CN 107708208B
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signal
system message
time
frequency
information
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CN107708208A (en
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侯雪颖
徐晓东
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China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
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China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
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Priority to PCT/CN2017/096361 priority patent/WO2018028554A1/en
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    • 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
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies
    • 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

Abstract

The invention provides a signal sending method, a signal receiving method, a base station and a terminal. The time-frequency positions of the synchronous signals and the system messages in the invention can be adjusted, but not fixed, so that the invention can flexibly adjust the time-frequency positions of the messages according to the frequency resource bandwidth distributed by different services or the interference condition of the network, thereby meeting the requirements of the 5G system on different service transmission and the requirements of more dense networking and improving the transmission efficiency of the system.

Description

Signal sending method, receiving method, base station and terminal
Technical Field
The present invention relates to the field of mobile communication technologies, and in particular, to a signal sending method, a signal receiving method, a base station, and a terminal.
Background
For a Long Term Evolution (LTE) system, due to limited service types and concentrated spectrum resources, different services, scenes, frequency bands, frame parameters/frame structures, resource allocation methods, and various system flow designs are fixed.
In the 5G era, the development of mobile internet and internet of things will bring more diversified business demands. Currently, the services that the 5G needs to satisfy at least include: enhanced Mobile internet (eMBB) service, Ultra-high reliability and Ultra-Low delay Communication (uRLLC) service, and Massive Machine Type Communication (mMTC) service.
Different services have different requirements, for example, for the eMBB service, a higher transmission data rate is required; for mtc traffic, low power, low data rate but large connection transmission is required; for URLLC, low latency and high reliability transmission is required. The 5G diversified service needs to configure more frequency band resources, and more flexible design needs to be performed on system carrier design and corresponding resource allocation.
For different service transmissions, the subcarrier characteristics may be different in consideration of the characteristics of different services, including subcarrier spacing, Transmission Timing Interval (TTI) length, guard interval (GP) length, and the like. For example, mtc traffic tends to use smaller subcarrier spacing, longer symbol length, e.g., 3.75kHz, in order to improve its coverage; the eMBB service has low requirements on deep coverage, but has a high data transmission rate, and when a large transmission bandwidth is allocated to the eMBB service, a large subcarrier interval may be used to reduce the FFT processing complexity, for example, 15kHz is used; for URLLC traffic, since it is sensitive to delay, the subcarrier spacing can be further increased to reduce the time domain symbol length and thus the TTI length, for example, by using 30kHz or 60 kHz.
For one carrier, it should be possible to serve multiple services. When the subcarrier characteristics of different services are different, it is necessary to design a multiplexing manner of different services, so that services with different subcarrier characteristics can be efficiently multiplexed on the same carrier resource for transmission. The specific multi-service multiplexing mode includes time division multiplexing and frequency division multiplexing. For the frequency division multiplexing mode, on the same carrier, different frequency domain resource blocks can be allocated for services adopting different subcarrier characteristics for frequency division multiplexing transmission, and more advanced filters can be adopted for the different frequency resource blocks so as to reduce the interference among the different frequency resource blocks. The multiplexing transmission is performed on one carrier wave based on a frequency division mode for different services, and if fixed bandwidth resources are allocated for different services, part of the resources may not be fully utilized due to the change of the traffic volume.
If the base station dynamically adjusts the frequency domain bandwidth resources allocated to different services according to the traffic volume change conditions of the services adopting different subcarrier characteristics, the resource utilization rate can be improved, and different bandwidth resources can be allocated according to the traffic volume change and the service type conditions of the services aiming at the requirements of different services.
For dynamic changes of the traffic volume, transmission modes of different bandwidth resources are dynamically allocated according to requirements of different services, and the sending modes of the synchronization signal and the broadcast signal need to be optimally designed.
In addition, as the traffic volume increases dramatically, the deployment of 5G base stations may be denser than that of the existing LTE system, and specifically, more base stations may be deployed in a unit area, so that if the LTE design is adopted to place the synchronization signal and the broadcast signal at the same frequency domain position of the bandwidth, and the frequency domain position is not adjustable, serious interference may be generated between the synchronization signal and the broadcast signal between the base stations. In order to reduce interference between synchronization signals and broadcast signals of different cells, the transmission modes of the synchronization signals and the broadcast signals need to be optimally designed.
Disclosure of Invention
The technical problem to be solved in the embodiments of the present invention is to provide a signal sending method, a signal receiving method, a base station, and a terminal, which are used to flexibly implement transmission of a synchronization signal and a system message.
In order to solve the above technical problem, a signal transmission method provided in an embodiment of the present invention includes:
adjusting the time-frequency position of a first signal from a first time-frequency position to a second time-frequency position, wherein the first signal comprises a synchronous signal and a system message accompanied by the synchronous signal;
and transmitting the first signal at a second time-frequency position.
Preferably, in the above method, the relative time-frequency position relationship between the synchronization signal and the system message accompanied by the synchronization signal is a preset fixed value.
Preferably, in the above-mentioned method,
the step of sending the first signal at the second time-frequency position includes:
the method comprises the steps of sending a first synchronization signal and a first system message at a first time frequency position, and sending a second synchronization signal and a second system message at a second time frequency position, wherein the first system message and the second system message carry indication information which is used for indicating that the first signal is sent at 2 time frequency positions at the same time and indicating that the system message is the first system message or the second system message.
Preferably, in the method, the step of sending the first signal at the second time-frequency position further includes:
and after a preset time window, stopping sending the first synchronization signal and the first system message at the first time frequency position, but continuing sending the second synchronization signal and the second system message at the second time frequency position, wherein the second system message carries indication information for indicating that the network only sends the first signal at 1 time frequency position.
Preferably, in the above method, the first system message or the second system message further carries the following information: the system frame number information is used for indicating the indication information of the frequency domain position information of the other first signal in the carrier when the other first signal except the first signal to which the system message belongs exists.
Preferably, in the above method, after the step of adjusting the time-frequency position of the first signal from the first time-frequency position to the second time-frequency position, the method further includes:
sending prompt information for prompting the update of the system message through physical layer downlink control information, wherein the physical layer downlink control information is positioned in a subframe before a subframe in which the first system message is positioned, or the physical layer downlink control information and the first system message are positioned in the same subframe; and the number of the first and second groups,
and the first system message sent at the first time-frequency position also carries the information of the second time-frequency domain position.
Preferably, in the above method, after the step of adjusting the time-frequency position of the first signal from the first time-frequency position to the second time-frequency position, the method further includes:
sending prompt information for prompting the update of the system message through physical layer downlink control information, wherein the physical layer downlink control information is positioned in a subframe before a subframe in which the first system message is positioned, or the physical layer downlink control information and the first system message are positioned in the same subframe; and the number of the first and second groups,
and the first system message sent at the first time-frequency position also carries the information of the second time-frequency domain position.
Preferably, in the method, the step of configuring corresponding synchronization channels and broadcast channels for the two or more subbands includes:
and allocating frequency domain bandwidth resources with variable positions and variable bandwidths for each sub-band, wherein the frequency domain position of the synchronization channel and the broadcast channel of each sub-band is positioned in the sub-band and is positioned at a fixed absolute frequency domain position in the system carrier bandwidth.
Preferably, in the method, when the sub-bandwidth or the frequency domain position allocated to each sub-band is adjusted, the method further includes:
the absolute frequency domain location of the synchronization signal may be different for different cells within the same system carrier bandwidth.
Preferably, in the method, when the sub-bandwidth or the frequency domain position allocated to each sub-band is adjusted, the method further includes:
and updating the system message to carry indication of the adjusted sub-bandwidth information or the adjusted frequency domain position information, and prompting a terminal currently serving to read the updated system message through physical layer downlink control information, wherein the physical layer downlink control information is located in a subframe before a subframe where the updated system message is located, or the physical layer downlink control information and the updated system message are located in the same subframe.
Preferably, in the method, the step of configuring corresponding synchronization channels and broadcast channels for the two or more subbands includes:
and allocating and adjusting a synchronization channel and a broadcast channel in each subband according to the subband width and the frequency domain resource position configured for each subband, so that the frequency domain position of the synchronization channel and the broadcast channel of each subband is positioned in the subband, and the absolute frequency domain position of the synchronization channel and the broadcast channel of each subband in the carrier bandwidth is changed according to the adjustment of the subband width and the frequency domain resource position of the subband.
Preferably, in the method, when the frequency domain positions of the synchronization channel and the broadcast channel corresponding to the sub-band change, the step of sending the first signal at both the first time-frequency position and the second time-frequency position includes:
and in a preset time window, simultaneously and respectively sending a synchronization signal and a system message at a first frequency domain position and a second frequency domain position aiming at the sub-band, wherein the first frequency domain position is the position before the frequency domain position of the synchronization channel and the broadcast channel corresponding to the sub-band is changed, and the second frequency domain position is the position after the frequency domain position of the synchronization channel and the broadcast channel corresponding to the sub-band is changed.
Preferably, in the method, the system message sent by the first frequency domain position further carries third indication information of the second frequency domain position, and the first frequency domain position does not transmit the synchronization signal and the fourth indication information of the system message after the time window.
Preferably, in the above method, the frequency domain position information of the synchronization channel and the broadcast channel is represented by offset value information between the frequency domain positions of the synchronization channel and the broadcast channel and a center frequency point of the carrier or the subband, or is represented by an index of a frequency domain resource block where the synchronization channel or the broadcast channel is located or an adjacent frequency domain resource block.
Preferably, in the method, when the frequency domain position information of the synchronization channel and the broadcast channel is represented by offset value information between the frequency domain positions of the synchronization channel and the broadcast channel and a center frequency point of a carrier or a subband, the offset value information includes:
the method comprises the steps of presetting a minimum sub-bandwidth unit, and offsetting the central frequency of a synchronization signal and the minimum sub-bandwidth unit where the synchronization signal is located, wherein the sub-bandwidth of the sub-band is an integral multiple of the minimum sub-bandwidth unit.
Preferably, in the above method, the offset value of the synchronization signal and the center frequency of the minimum sub-bandwidth unit in which the synchronization signal is located is selected from a plurality of offset values that are preset according to the cell specific identifier.
The embodiment of the invention also provides a signal receiving method, which comprises the following steps:
a terminal detects a first signal on a system carrier bandwidth, wherein the first signal comprises a synchronous signal and a system message accompanied by the synchronous signal;
the terminal analyzes the indication information carried in the detected system message and identifies that the detected first signal is the first signal sent by the first time-frequency position or the first signal sent by the second time-frequency position, wherein the base station can send the first signal at the first time-frequency position and/or the second time-frequency position, and the first time-frequency position and the second time-frequency position are the sending positions of the first signal before and after adjustment.
Preferably, in the method, the step of analyzing, by the terminal, the indication information carried in the detected system message and identifying that the detected first signal is the first signal sent by the first time-frequency location or the first signal sent by the second time-frequency location includes:
analyzing the indication information carried in the detected system message;
when the indication information indicating that the network simultaneously transmits the first signal at 2 time frequency positions and indicating that the system message is the first system message transmitted at the first time frequency position or the second system message transmitted at the second time frequency position is obtained through analysis, the detected first signal is determined to be the first signal transmitted at the first time frequency position or the first signal transmitted at the second time frequency position according to the indication information obtained through analysis.
Preferably, in the method, the step of analyzing, by the terminal, the indication information carried in the detected system message and identifying that the detected first signal is the first signal sent by the first time-frequency location or the first signal sent by the second time-frequency location further includes:
when another first signal except the first signal of the message of the system exists, the indication information of the frequency domain position information of the other first signal in the carrier wave is obtained through analysis, and the other first signal is received according to the frequency domain position information of the other first signal in the carrier wave.
Preferably, the method further comprises:
receiving prompt information for prompting the update of the system message from physical layer downlink control information, wherein the physical layer downlink control information is positioned in a subframe before a subframe in which the first system message is positioned, or the physical layer downlink control information and the first system message are positioned in the same subframe;
and reading the information of the second time-frequency domain position after the time-frequency position adjustment carried in the first system message according to the prompt information, and detecting and receiving a second synchronization signal and a second system message at the second time-frequency position according to the information of the second time-frequency domain position.
Preferably, in the method, the frequency domain position of the synchronization channel and the broadcast channel of each sub-band is located in the sub-band, and the absolute frequency domain position of the synchronization channel and the broadcast channel of each sub-band in the carrier bandwidth is variable.
Preferably, in the above method, the system message carries one or more of the following information: system timing information, bandwidth information of a carrier or a sub-band, and frequency domain location information of a synchronization channel and a broadcast channel within the carrier or the sub-band; the frequency domain position information of the synchronous channel and the broadcast channel in the carrier wave or the sub-band is represented by the offset value information between the frequency domain positions of the synchronous channel and the broadcast channel and the center frequency point of the sub-band, or represented by the index of the frequency domain resource block where the synchronous channel or the broadcast channel is located or the adjacent frequency domain resource block.
When the frequency domain position information of the synchronization channel and the broadcast channel in the sub-band is represented by the offset value information between the frequency domain positions of the synchronization channel and the broadcast channel and the center frequency point of the sub-band, the offset value information includes:
a preset minimum sub-bandwidth unit, and an offset value of a center frequency of a synchronization signal and the minimum sub-bandwidth unit where the synchronization signal is located, wherein the sub-bandwidth of the sub-band is an integral multiple of the minimum sub-bandwidth unit;
the method further comprises the following steps: and calculating a center frequency point CenterF of the sub-band according to a formula CenterF which is F _ Sync + BW _ config/2- (BW _ min/2-fk), wherein F _ Sync represents the center frequency point of the detected synchronous signal, BW _ config represents a bandwidth value of the sub-band, BW _ min represents a preset minimum sub-band width unit, and fk represents an offset value of the center frequency of the synchronous signal and the minimum sub-band width unit where the synchronous signal is located.
An embodiment of the present invention further provides a base station, including:
the position adjusting unit is used for adjusting the time frequency position of a first signal from a first time frequency position to a second time frequency position, wherein the first signal comprises a synchronous signal and a system message accompanied by the synchronous signal;
and the sending unit is used for sending the first signal at a second time frequency position.
Preferably, in the base station, a relative time-frequency position relationship between the synchronization signal and a system message associated with the synchronization signal is a preset fixed value.
Preferably, in the base station, the transmission unit includes:
the first processing unit is configured to send a first synchronization signal and a first system message at a first time-frequency position, and send a second synchronization signal and a second system message at a second time-frequency position, where the first system message and the second system message carry indication information indicating that the first signal is sent at 2 time-frequency positions at the same time and indicating that the system message is the first system message or the second system message.
Preferably, in the base station, the transmitting unit further includes:
and the second processing unit is used for stopping sending the first synchronization signal and the first system message at the first time-frequency position after a preset time window, but continuing sending the second synchronization signal and the second system message at the second time-frequency position, and the second system message carries indication information for indicating that the network only sends the first signal at 1 time-frequency position.
Preferably, in the base station, the adjusting of the time-frequency position of the first signal includes adjusting within one carrier and adjusting within two or more sub-bands of one carrier;
for more than two sub-bands within a carrier, the system carrier bandwidth is divided into more than two sub-bands, each sub-band is configured with a corresponding first signal; the position adjustment unit includes:
and the subband adjusting unit is used for adjusting the first signal configured for the kth subband to a second time-frequency position in the kth subband from a first time-frequency position in the kth subband, wherein k is more than or equal to 1 and less than or equal to N, and N is an integer more than or equal to 2 and represents the number of the subbands.
Preferably, in the base station, the first system message carries one or more of the following information: system frame number information, indication information indicating whether the second synchronization signal exists, and indication information indicating frequency domain position information of the second synchronization channel and the second broadcast channel in the carrier wave.
The second system message carries one or more of the following information: system frame number information, indication information indicating whether the first synchronization signal exists, and indication information indicating frequency domain position information of the first synchronization channel and the first broadcast channel in the carrier.
Preferably, in the base station, the sending unit is further configured to send, through physical layer downlink control information, a prompt message for prompting that the system message is updated, where the physical layer downlink control information is located in a subframe before a subframe where the first system message is located, or the physical layer downlink control information and the first system message are located in the same subframe; and the first system message sent at the first time-frequency position also carries the information of the second time-frequency domain position.
Preferably, the base station further includes:
the first configuration unit is configured to allocate frequency domain bandwidth resources with variable positions and variable bandwidths to each sub-band, where the frequency domain position of the synchronization channel and the broadcast channel of each sub-band is located in the sub-band and is located at a fixed absolute frequency domain position in the system carrier bandwidth.
Preferably, the base station further includes:
an updating unit, configured to update the system message to carry information indicating the adjusted sub-bandwidth or the adjusted frequency domain position when the sub-bandwidth or the frequency domain position allocated to each sub-band is adjusted;
and a second sending unit, configured to prompt a currently serving terminal to read an updated system message through physical layer downlink control information, where the physical layer downlink control information is located in a subframe before a subframe in which the updated system message is located, or the physical layer downlink control information and the updated system message are located in the same subframe.
Preferably, the base station further includes:
and the second configuration unit is used for allocating and adjusting the synchronization channel and the broadcast channel in each sub-band according to the sub-band width and the frequency domain resource position configured for each sub-band, so that the frequency domain position of the synchronization channel and the broadcast channel of each sub-band is located in the sub-band, and the absolute frequency domain position of the synchronization channel and the broadcast channel of each sub-band in the carrier bandwidth is changed according to the adjustment of the sub-band width and the frequency domain resource position of the sub-band.
Preferably, in the base station, the first processing unit is specifically configured to send, in a preset time window, a synchronization signal and a system message to the sub-band at a first frequency domain position and a second frequency domain position at the same time, where the first frequency domain position is a position before frequency domain positions of a synchronization channel and a broadcast channel corresponding to the sub-band are changed, and the second frequency domain position is a position after frequency domain positions of the synchronization channel and the broadcast channel corresponding to the sub-band are changed.
Preferably, in the base station, the system message sent by the first frequency domain position further carries third indication information of the second frequency domain position, and the first frequency domain position does not transmit the synchronization signal and the fourth indication information of the system message after the time window.
Preferably, in the base station, the frequency domain position information of the synchronization channel and the broadcast channel in the sub-band is represented by offset value information between the frequency domain positions of the synchronization channel and the broadcast channel and a center frequency point of the sub-band, or is represented by an index of a frequency domain resource block where the synchronization channel or the broadcast channel is located or an adjacent frequency domain resource block.
Preferably, in the base station, when the frequency domain position information of the synchronization channel and the broadcast channel in the sub-band is represented by offset value information between the frequency domain positions of the synchronization channel and the broadcast channel and a center frequency point of the sub-band, the offset value information includes:
the method comprises the steps of presetting a minimum sub-bandwidth unit, and offsetting the central frequency of a synchronization signal and the minimum sub-bandwidth unit where the synchronization signal is located, wherein the sub-bandwidth of the sub-band is an integral multiple of the minimum sub-bandwidth unit.
Preferably, in the base station, the offset value of the synchronization signal and the center frequency of the minimum sub-bandwidth unit in which the synchronization signal is located is selected from a plurality of offset values set in advance according to the cell specific identifier.
An embodiment of the present invention further provides a terminal, including:
a detecting unit, configured to detect a first signal on a system carrier bandwidth, where the first signal includes a synchronization signal and a system message accompanied by the synchronization signal;
and the analysis unit is used for analyzing the indication information carried in the detected system message and identifying that the detected first signal is the first signal sent by the first time-frequency position or the first signal sent by the second time-frequency position, wherein the base station can send the first signal at the first time-frequency position and/or the second time-frequency position, and the first time-frequency position and the second time-frequency position are the sending positions of the first signal before and after adjustment.
Preferably, the parsing unit is specifically configured to parse the indication information carried in the detected system message; when the indication information indicating that the network simultaneously transmits the first signal at 2 time frequency positions and indicating that the system message is the first system message transmitted at the first time frequency position or the second system message transmitted at the second time frequency position is obtained through analysis, the detected first signal is determined to be the first signal transmitted at the first time frequency position or the first signal transmitted at the second time frequency position according to the indication information obtained through analysis.
Preferably, the parsing unit is further configured to, when parsing obtains indication information indicating frequency domain location information of another first signal within a carrier in the presence of another first signal other than the first signal to which the present system message belongs, receive the another first signal according to the frequency domain location information of the another first signal within the carrier.
Preferably, the terminal further includes:
a receiving unit, configured to receive, from physical layer downlink control information, prompt information for prompting that a system message is updated, where the physical layer downlink control information is located in a subframe before a subframe where a first system message is located, or the physical layer downlink control information and the first system message are located in the same subframe;
the detection unit is further configured to read, according to the prompt information, information of a second time-frequency domain position, which is carried in the first system message and after the time-frequency position is adjusted, and detect and receive a second synchronization signal and a second system message at the second time-frequency position according to the information of the second time-frequency domain position.
Compared with the prior art, according to the signal sending method, the signal receiving method, the base station and the terminal provided by the embodiment of the invention, the time-frequency positions of the synchronization signal and the system message can be adjusted rather than fixed and unchangeable, so that the time-frequency positions of the messages can be flexibly adjusted according to frequency resource bandwidths distributed by different services or the interference condition of a network, the requirements for transmission of different services and the requirements for more dense networking in a 5G system are met, and the transmission efficiency of the system is improved.
Drawings
Fig. 1 is a schematic flowchart of a signal transmission method according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating center frequency point calculation according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of a signal receiving method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help the full understanding of the embodiments of the present invention. Thus, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
In addition, the terms "system" and "network" are often used interchangeably herein.
It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
In the embodiments provided herein, it should be understood that "B corresponding to a" means that B is associated with a from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.
In the embodiment of the present invention, the Base Station may be a Macro Base Station (Macro Base Station), a micro Base Station (Pico Base Station), a Node B (3G mobile Station), an enhanced Base Station (ENB), a Home enhanced Base Station (femtobe or Home eNode B or Home ENB or HNEB), a relay Station, an access point, an RRU (Remote Radio Unit), an RRH (Remote Radio Head), and the like. The terminal may be a mobile phone (or handset), or other device capable of sending or receiving wireless signals, including a User Equipment (UE), a Personal Digital Assistant (PDA), a wireless modem, a wireless communicator, a handheld device, a laptop computer, a cordless phone, a Wireless Local Loop (WLL) station, a CPE (Customer Premise Equipment) or mobile smart hotspot capable of converting mobile signals to WiFi signals, a smart appliance, or other device capable of autonomously communicating with a mobile communication network without human operation, etc.
Here, it should be noted that broadcast signals of the mobile communication system have different definitions according to different protocol standards, and generally, should contain frame timing information such as a Main Information Block (MIB) and a System Information Block (SIB). Herein, various broadcast signals employed in various mobile communication systems will be represented in terms of a system message, which may include one or more of the following information in general: system timing information, bandwidth information of a carrier or sub-band, and frequency domain location information of a synchronization channel and a broadcast channel within the carrier or sub-band, etc.
In the existing LTE system, a synchronization signal and a broadcast signal are placed at a plurality of frequency domain resource locations in the center of a bandwidth. As the traffic volume increases, the base station deployment will become more and more dense, and then there will be large interference for the synchronization signal and the broadcast signal in the center of the bandwidth. In addition, for the transmission method of dynamically adjusting different service bandwidths, if the transmission method of LTE is used, a part of fixed resources needs to be additionally allocated in the center of the bandwidth, and the subcarrier characteristics of the resources may be the same as or different from those of specific service transmission, so that the resources cannot be flexibly adjusted. Therefore, when the network side dynamically allocates different transmission modes of bandwidth resources according to the requirements of different services, the transmission modes of the synchronization signal and the broadcast signal of the mobile communication system need to be optimally designed.
The invention provides a transmission scheme of a synchronous signal and a system message, and the time-frequency positions of the synchronous signal and the system message can be flexibly adjusted. Referring to fig. 1, a signal transmission method provided in an embodiment of the present invention can be applied to a base station on a network side, and includes the following steps:
step 11, adjusting the time-frequency position of a first signal from a first time-frequency position to a second time-frequency position, wherein the first signal comprises a synchronization signal and a system message accompanied by the synchronization signal.
Here, the adjustment of the time-frequency position of the first signal may be an adjustment within one carrier, or an adjustment within two or more sub-bands of one carrier. For more than two sub-bands within a carrier, the system carrier bandwidth is divided into more than two sub-bands, each sub-band is configured with a corresponding first signal; at this time, the first signal configured for the kth subband is adjusted to a second time-frequency position in the kth subband from a first time-frequency position in the kth subband, where k is greater than or equal to 1 and less than or equal to N, and N is an integer greater than or equal to 2, and represents the number of subbands. That is, for each sub-band, the time-frequency position of the first signal of the sub-band is configured inside the sub-band, and the adjusted second time-frequency position is also located inside the sub-band.
And step 12, sending the first signal at a second time frequency position.
Here, in step 12, a first synchronization signal and a first system message may be sent at a first time frequency position, and a second synchronization signal and a second system message may be sent at a second time frequency position, where the first system message and the second system message carry indication information indicating that the first signal is sent at 2 time frequency positions at the same time and indicating that the system message is the first system message or the second system message.
The embodiment of the invention can simultaneously send the synchronous signal and the system message at the first time frequency position and the second time frequency position in a preset time window. After the time window, stopping sending the first synchronization signal and the first system message at the first time frequency position, but continuing sending the second synchronization signal and the second system message at the second time frequency position, and carrying indication information for indicating that the network only sends the first signal at 1 time frequency position in the second system message.
As an implementation manner, the first system message or the second system message further carries the following information: the system frame number information is used for indicating the indication information of the frequency domain position information of the other first signal in the carrier when the other first signal except the first signal to which the system message belongs exists.
It can be seen from the above steps that the embodiments of the present invention can flexibly adjust the time or frequency positions of the synchronization signal and the system message in the carrier, and by adjusting the time-frequency positions of the synchronization signal and the system message, not only can the flexibility of resource usage be improved, but also the inter-cell interference of the synchronization and the system message can be effectively coordinated, and the cell search performance is improved.
In the embodiment of the present invention, the relative time-frequency position relationship between the synchronization signal in the first signal and the system message associated with the synchronization signal is a preset fixed value, that is, the synchronization signal and the system message have a relatively fixed time-frequency position relationship therebetween, and after receiving the synchronization signal, the terminal can detect and receive the system message according to the relatively fixed time-frequency position relationship. The fixed value may be predetermined, and for example, the fixed value may be configured in advance on both the network side and the terminal side. The fixed value may also be determined and notified to the terminal by the network side, for example, the base station carries the fixed value in a signaling message/broadcast message to notify the terminal.
As one implementation, the base station may transmit the synchronization signal on a synchronization channel and the system message on a broadcast channel. For example, a first synchronization channel and a first broadcast channel at a first time frequency position transmit a first synchronization signal and a first system message, respectively, and a second synchronization channel and a second broadcast channel at a second time frequency position transmit a second synchronization signal and a second system message, respectively.
After adjusting the time-frequency position of the first signal from the first time-frequency position to the second time-frequency position, in step 12, the base station may send the first signal at both the first time-frequency position and the second time-frequency position, where a first synchronization signal and a first system message in the first signal at the first time-frequency position are sent in a first synchronization channel and a first broadcast channel, respectively, and a second synchronization signal and a second system message in the first signal at the second time-frequency position are sent in a second synchronization channel and a second broadcast channel, respectively.
As an implementation manner, in the embodiment of the present invention, the system message in the first signal may further carry first indication information, where the first indication information is used to indicate that the network side simultaneously sends the first signal at 2 time-frequency positions, and indicate that a synchronization signal associated with the system message is a first synchronization signal or a second synchronization signal, the first synchronization signal is a synchronization signal sent at a time-frequency position before adjustment, and the second synchronization signal is a synchronization signal sent at a time-frequency position after adjustment. Thus, when the terminal receives the system message, the terminal can determine that the system message/synchronization signal is a signal sent by the first time-frequency position before adjustment or the second time-frequency position after adjustment according to the first indication information.
By simultaneously sending the first signal at the two time-frequency positions, the accessed terminal can acquire the position change of the synchronous signal and the system message by detecting the related system message, thereby ensuring that the transmission of the accessed terminal is not interrupted and ensuring the functions of related measurement and information reading.
The embodiment of the invention can send the first signal at two time-frequency positions in a certain preset time window; after the time window, stopping sending the first signal at the first time frequency position, but continuing to send the first signal at the second time frequency position, and the second system message sent by the second time frequency position carries indication information for indicating that the network side only sends the first signal at 1 time frequency position.
As an implementation manner, in the embodiment of the present invention, the first system message carries one or more of the following information: system frame number information, indication information indicating whether the second synchronization signal exists, and indication information indicating frequency domain position information of the second synchronization channel and the second broadcast channel in the carrier wave. The second system message carries one or more of the following information: system frame number information, indication information indicating whether the first synchronization signal exists, and indication information indicating frequency domain position information of the first synchronization channel and the first broadcast channel in the carrier.
In addition, in the above method, after the step of adjusting the time-frequency position of the first signal from the first time-frequency position to the second time-frequency position, the method further includes: sending prompt information for prompting the update of the system message through physical layer downlink control information, wherein the physical layer downlink control information is positioned in a subframe before a subframe in which the first system message is positioned, or the physical layer downlink control information and the first system message are positioned in the same subframe; and the first system message sent at the first time-frequency position also carries the information of the second time-frequency domain position.
In the embodiment of the invention, the synchronization signal and the system message in the first signal can be respectively sent through the first synchronization channel and the first broadcast channel of the first time-frequency position, and the synchronization signal and the system message in the first signal can be respectively sent through the second synchronization channel and the second broadcast channel of the first time-frequency position. When the system carrier bandwidth is divided into more than two sub-bands, and each sub-band is configured with a corresponding first signal, before step 11, the embodiment of the present invention may further configure corresponding first synchronization channel and first broadcast channel for the more than two sub-bands, where the frequency domain positions of the first synchronization channel and the first broadcast channel of each sub-band are located in the sub-band; then, a carrier synchronization signal and a system message for each sub-band are transmitted through the first synchronization channel and the first broadcast channel of the sub-band.
Two ways of configuring the synchronization channel/broadcast channel that may be employed by embodiments of the present invention will be described below.
The first mode is as follows:
in this way, when the first synchronization channel and the first broadcast channel corresponding to the two or more sub-bands are configured, frequency domain bandwidth resources with variable positions and variable bandwidths may be allocated to each sub-band, and the frequency domain position of the first synchronization channel and the first broadcast channel of each sub-band is located in the sub-band and is located at a fixed absolute frequency domain position in the system carrier bandwidth.
It can be seen that in this embodiment, the absolute frequency domain positions of the first synchronization channel and the first broadcast channel are fixed positions. In addition, the absolute frequency domain positions of the synchronization signals of more than two sub-bands can be the same or different in the same system carrier bandwidth for different cells.
Thus, when the sub-bandwidth or the frequency domain position allocated to each sub-band is adjusted, the embodiment of the present invention may update the system message to carry information indicating the adjusted sub-bandwidth or the adjusted frequency domain position, and prompt the terminal of the current service to read the updated system message through the physical layer downlink control information, where the physical layer downlink control information is located in a sub-frame before the sub-frame where the updated system message is located, or the physical layer downlink control information and the updated system message are located in the same sub-frame. Through the processing, the terminal can read the system information in time, so that the adjustment condition of the sub-band can be known, and the transmission reliability can be further ensured.
The second mode is as follows:
in this manner, when the first synchronization channel and the first broadcast channel corresponding to the two or more subbands are configured, the synchronization channel and the broadcast channel in each subband may be allocated and adjusted according to the subband width and the frequency domain resource location configured for each subband, so that the frequency domain location of the synchronization channel and the broadcast channel in each subband is located in the subband, and the absolute frequency domain location of the synchronization channel and the broadcast channel in each subband in the carrier bandwidth is changed according to the adjustment of the subband width and the frequency domain resource location of the subband.
It can be seen that in this embodiment, the absolute frequency domain positions of the first synchronization channel and the first broadcast channel are not fixed positions.
In this embodiment, when the frequency domain positions of the first synchronization channel and the first broadcast channel corresponding to the sub-band change, the sending the first signal at both the first time-frequency position and the second time-frequency position specifically includes: and in a preset time window, respectively sending a carrier synchronization signal and a system message to the sub-band at a first frequency domain position and a second frequency domain position at the same time, wherein the first frequency domain position is a position before the frequency domain positions of a first synchronization channel and a first broadcast channel corresponding to the sub-band are changed, and the second frequency domain position is a position after the frequency domain positions of the first synchronization channel and the first broadcast channel corresponding to the sub-band are changed (the synchronization channel and the broadcast channel at the changed frequency domain position are the second synchronization channel and the second broadcast channel).
In addition, the base station may further carry third indication information of the second frequency domain position in the system message sent by the first frequency domain position, and the first frequency domain position will not transmit the synchronization signal and the fourth indication information of the system message after the time window, so as to prompt the terminal to perform corresponding receiving processing.
As mentioned in the foregoing, the system message may include one or more of the following information: system timing information, bandwidth information of a carrier or sub-band, and frequency domain location information of a synchronization channel and a broadcast channel within the carrier or sub-band, etc. The representation mode of the frequency domain position information of the synchronization channel and the broadcast channel in the carrier or the sub-band can be represented by offset value information between the frequency domain positions of the synchronization channel and the broadcast channel and the center frequency point of the carrier or the sub-band, or represented by an index of a frequency domain resource block where the synchronization channel or the broadcast channel is located or an adjacent frequency domain resource block.
For example, when the frequency domain position information of the synchronization channel and the broadcast channel in the sub-band is represented by offset value information between the frequency domain position of the synchronization channel and the broadcast channel and the center frequency point of the carrier or the sub-bandwidth, a limited type of bandwidth value and a limited type of synchronization signal offset value may be designed in order to reduce signaling overhead of the offset value information. An indication manner of the offset value information is set in a basic unit of a minimum bandwidth among a limited variety of bandwidth values, and a specific offset value information may include: the method comprises the steps of presetting a minimum sub-bandwidth unit, and offsetting the central frequency of a synchronization signal and the minimum sub-bandwidth unit where the synchronization signal is located, wherein the sub-bandwidth is integral multiple of the minimum sub-bandwidth unit.
Here, in order to adjust interference between different cells, the offset value of the center frequency of the synchronization signal and the minimum sub-bandwidth unit where the synchronization signal is located may be selected from a plurality of offset values set in advance according to a cell-specific identifier (such as a physical cell identifier), for example, several limited selectable values [ f1, f2, …, fk ] of the Sync signal may be designed in the minimum bandwidth, and fk represents the offset value of the center frequency of the synchronization signal and the minimum sub-bandwidth unit where the synchronization signal is located.
And the base station sends the offset value information of the offset value (fk) of the center frequency of the minimum sub-bandwidth unit (BW _ min) and the synchronization signal and the minimum sub-bandwidth unit where the synchronization signal is positioned to the terminal. The terminal may calculate a center frequency point centrf of the sub-band according to a formula centrf — F _ Sync + BW _ config/2- (BW _ min/2-fk), where F _ Sync represents a center frequency point of the detected synchronization signal, BW _ config represents a bandwidth value of the sub-band, BW _ min represents a preset minimum sub-band width unit, and fk represents an offset value of a center frequency of the synchronization signal and the minimum sub-band width unit where the synchronization signal is located. Fig. 2 further shows an exemplary diagram of the above-mentioned calculation of the center frequency point.
It can be seen from the foregoing that, the signal sending method provided in the embodiment of the present invention provides a scheme for flexibly transmitting a synchronization signal and a system message, and is applicable to changes in frequency resource bandwidths allocated to different services, so as to meet requirements for transmission of different services in a 5G system, and improve system transmission efficiency.
The embodiments of the present invention will be explained from the terminal side.
Referring to fig. 3, the signal receiving method provided in the embodiment of the present invention, when applied to a terminal, includes the following steps:
in step 31, the terminal detects a first signal on the system carrier bandwidth, where the first signal includes a synchronization signal and a system message accompanied by the synchronization signal.
Here, the time-frequency position of the synchronization signal and the system message accompanying the synchronization signal is adjustable.
Step 32, the terminal analyzes the indication information carried in the detected system message, and identifies that the detected first signal is the first signal sent by the first time frequency position or the first signal sent by the second time frequency position, wherein the base station can send the first signal at the first time frequency position and/or the second time frequency position, and the first time frequency position and the second time frequency position are the sending positions of the first signal before and after adjustment.
Here, the base station may transmit the first synchronization signal and the first system message at a first time-frequency position, and/or transmit the second synchronization signal and the second system message at a second time-frequency position, where the first time-frequency position and the second time-frequency position are transmission positions of the synchronization signal and the system message before and after the adjustment.
Here, the relative time-frequency location relationship between the synchronization signal and the system message may be predetermined, for example, both the network side and the terminal side are configured with the above-mentioned relative time-frequency location relationship in advance. The relative time-frequency position relationship may also be determined and notified to the terminal by the network side, for example, the base station carries the information of the relative time-frequency position relationship in a signaling message/a broadcast message to notify the terminal.
In step 32, the terminal may analyze the indication information carried in the detected system message:
for example, when the indication information indicating that the network simultaneously transmits the first signal at 2 time frequency positions and indicating that the system message is the first system message transmitted at the first time frequency position or the second system message transmitted at the second time frequency position is obtained through parsing, it is determined that the detected first signal is the first signal transmitted at the first time frequency position or the first signal transmitted at the second time frequency position according to the indication information obtained through parsing.
For another example, when another first signal other than the first signal to which the message belongs is obtained by parsing, the indication information indicating the frequency domain position information of the another first signal within the carrier is received according to the frequency domain position information of the another first signal within the carrier.
As one implementation, the base station may transmit the synchronization signal on a synchronization channel and the system message on a broadcast channel. For example, a first synchronization channel and a first broadcast channel at a first time frequency position transmit a first synchronization signal and a first system message, respectively, and a second synchronization channel and a second broadcast channel at a second time frequency position transmit a second synchronization signal and a second system message, respectively.
The terminal can also analyze the system message to obtain indication information used for indicating the frequency domain position information of the second synchronization channel and the second broadcast channel in the carrier or indication information used for indicating the frequency domain position information of the first synchronization channel and the first broadcast channel in the carrier; then, receiving signals sent by the second synchronization channel and the second broadcast channel according to the indication information for indicating the frequency domain position information of the second synchronization channel and the second broadcast channel in the carrier, or receiving signals sent by the first synchronization channel and the first broadcast channel according to the indication information for indicating the frequency domain position information of the first synchronization channel and the first broadcast channel in the carrier.
It can be seen from the above steps that the time-frequency positions of the synchronization signal and the system message in the embodiment of the present invention are adjustable, rather than fixed, so that the time-frequency positions of the messages can be flexibly adjusted according to the frequency resource bandwidths allocated to different services or the interference situation of the network, thereby meeting the requirements of the 5G system for different service transmissions and the requirements of denser networking and improving the transmission efficiency of the system.
In a period of time after the time frequency position of the synchronization signal/system message is adjusted, the network side may simultaneously send the synchronization signal/system message at both the first time frequency position and the second time frequency position before and after the adjustment, and the system message carries indication information for indicating that the sent message belongs to the first time frequency position or the second time frequency position, so in step 32, the terminal may analyze the predetermined indication information carried in the system message, where the predetermined indication information includes first indication information for indicating that the network side simultaneously sends the first signal at 2 time frequency positions, and indicates that the synchronization signal associated with the system message is the synchronization signal at the first time frequency position or the second synchronization signal at the second time frequency position, and also includes second indication information for indicating that the network side only sends the first signal at 1 time frequency position. The terminal can determine that the network side sends the first signal at 1 or 2 time frequency positions according to the predetermined indication information, receive the first signal sent at 1 or 2 time frequency positions by the network side, and further determine that the time frequency position of the system message belongs to the first time frequency position before adjustment or the second time frequency position after adjustment when the network side sends the first signal at 2 time frequency positions, wherein the first signal comprises a synchronization signal and a system message accompanied by the synchronization signal.
In addition, the network side may also carry third indication information of the second time-frequency position in the system message sent by the first time-frequency position, and the first time-frequency position will not transmit the synchronization signal and the fourth indication information of the system message after the time window, so as to prompt the terminal to perform corresponding receiving processing. Therefore, in the above step 32, the terminal may determine the second time-frequency position according to the third indication information and the fourth indication information parsed from the system message, receive the first signal at the second time-frequency position, and stop receiving the first signal at the first time-frequency position after the time window.
In the embodiment of the invention, the network side can divide the system carrier bandwidth into more than two sub-bands, and the sub-carrier intervals of different sub-bands are the same but are used for receiving and transmitting the same or different services. Since the network side may adjust the sub-band (for example, adjust the frequency domain position of the sub-band or change the bandwidth size of the sub-band), when the sub-band or the frequency domain position allocated to each sub-band is adjusted, the network side may update the first system message to carry information indicating the adjusted sub-band width or the adjusted frequency domain position, and prompt the currently serving terminal to read the updated first system message through the physical layer downlink control information, where the physical layer downlink control information is located in a sub-frame before the sub-frame where the updated first system message is located, or the physical layer downlink control information and the updated first system message are located in the same sub-frame. Correspondingly, the terminal side can receive prompt information for prompting the update of the system message from the downlink control information of the physical layer; and reading the information of the second time-frequency domain position after the time-frequency position adjustment carried in the first system message according to the prompt information, and detecting and receiving a second synchronization signal and a second system message at the second time-frequency position according to the information of the second time-frequency domain position. Through the processing, the terminal can read the system information in time, so that the adjustment condition of the sub-band can be known, and the transmission reliability can be further ensured.
As described above, the system message carries one or more of the following information: system frame number information, indication information indicating whether other synchronization signals exist, and indication information indicating frequency domain position information of other synchronization channels and other broadcast channels in the carrier. As an implementation manner, the frequency domain position of the synchronization channel and the broadcast channel of each sub-band of the embodiment of the present invention is located in the sub-band, and the absolute frequency domain position of the synchronization channel and the broadcast channel of each sub-band in the carrier bandwidth is variable. The frequency domain position information of the synchronization channel and the broadcast channel in the sub-band can be represented by offset value information between the frequency domain positions of the synchronization channel and the broadcast channel and the center frequency point of the sub-band, or represented by the index of the frequency domain resource block where the synchronization channel or the broadcast channel is located or the adjacent frequency domain resource block.
For example, when the frequency domain position information of the synchronization channel and the broadcast channel in the sub-band is represented by offset value information between the frequency domain positions of the synchronization channel and the broadcast channel and the center frequency point of the sub-band, the offset value information includes: the method comprises the steps of presetting a minimum sub-bandwidth unit, and offsetting the central frequency of a synchronization signal and the minimum sub-bandwidth unit where the synchronization signal is located, wherein the sub-bandwidth of the sub-band is an integral multiple of the minimum sub-bandwidth unit. At this time, the terminal may calculate, according to the offset value information obtained in the system message, a center frequency point centrf of the sub-band according to a formula centrf ═ F _ Sync + BW _ config/2- (BW _ min/2-fk), where F _ Sync represents a center frequency point of the detected synchronization signal, BW _ config represents a bandwidth value of the sub-band, BW _ min represents a preset minimum sub-band width unit, and fk represents an offset value of the synchronization signal and a center frequency of the minimum sub-band width unit where the synchronization signal is located.
Referring to fig. 4, an embodiment of the present invention provides a base station for implementing the foregoing method, where the base station includes:
a position adjusting unit 41, configured to adjust a time-frequency position of a first signal from a first time-frequency position to a second time-frequency position, where the first signal includes a synchronization signal and a system message accompanied by the synchronization signal;
a sending unit 42, configured to send the first signal at a second time-frequency location.
Here, it is preferable that the relative time-frequency positional relationship between the synchronization signal and the system message accompanying the synchronization signal is a preset fixed value.
Preferably, the sending unit includes:
the first processing unit is configured to send a first synchronization signal and a first system message at a first time-frequency position, and send a second synchronization signal and a second system message at a second time-frequency position, where the first system message and the second system message carry indication information indicating that the first signal is sent at 2 time-frequency positions at the same time and indicating that the system message is the first system message or the second system message.
Preferably, the sending unit further includes:
and the second processing unit is used for stopping sending the first synchronization signal and the first system message at the first time-frequency position after a preset time window, but continuing sending the second synchronization signal and the second system message at the second time-frequency position, and the second system message carries indication information for indicating that the network only sends the first signal at 1 time-frequency position.
Here, the first system message or the second system message further carries the following information: the system frame number information is used for indicating the indication information of the frequency domain position information of the other first signal in the carrier when the other first signal except the first signal to which the system message belongs exists.
In the embodiment of the present invention, the adjustment of the time-frequency position of the first signal includes adjustment within one carrier and adjustment within two or more sub-bands of one carrier; for more than two sub-bands within a carrier, the system carrier bandwidth is divided into more than two sub-bands, each sub-band is configured with a corresponding first signal; the position adjusting unit may specifically include:
and the subband adjusting unit is used for adjusting the first signal configured for the kth subband to a second time-frequency position in the kth subband from a first time-frequency position in the kth subband, wherein k is more than or equal to 1 and less than or equal to N, and N is an integer more than or equal to 2 and represents the number of the subbands.
Here, the first system message carries one or more of the following information: system frame number information, indication information indicating whether the second synchronization signal exists, and indication information indicating frequency domain position information of the second synchronization channel and the second broadcast channel in the carrier wave.
The second system message carries one or more of the following information: system frame number information, indication information indicating whether the first synchronization signal exists, and indication information indicating frequency domain position information of the first synchronization channel and the first broadcast channel in the carrier.
Here, the sending unit is further configured to send, through physical layer downlink control information, a prompt message for prompting that a system message is updated, where the physical layer downlink control information is located in a subframe before a subframe where a first system message is located, or the physical layer downlink control information and the first system message are located in the same subframe; and the first system message sent at the first time-frequency position also carries the information of the second time-frequency domain position.
As an implementation manner, the base station according to the embodiment of the present invention may further include:
the first configuration unit is configured to allocate frequency domain bandwidth resources with variable positions and variable bandwidths to each sub-band, where the frequency domain position of the synchronization channel and the broadcast channel of each sub-band is located in the sub-band and is located at a fixed absolute frequency domain position in the system carrier bandwidth.
An updating unit, configured to update the system message to carry information indicating the adjusted sub-bandwidth or the adjusted frequency domain position when the sub-bandwidth or the frequency domain position allocated to each sub-band is adjusted;
and a second sending unit, configured to prompt a currently serving terminal to read an updated system message through physical layer downlink control information, where the physical layer downlink control information is located in a subframe before a subframe in which the updated system message is located, or the physical layer downlink control information and the updated system message are located in the same subframe.
As another implementation manner, the base station according to the embodiment of the present invention may further include:
and the second configuration unit is used for allocating and adjusting the synchronization channel and the broadcast channel in each sub-band according to the sub-band width and the frequency domain resource position configured for each sub-band, so that the frequency domain position of the synchronization channel and the broadcast channel of each sub-band is located in the sub-band, and the absolute frequency domain position of the synchronization channel and the broadcast channel of each sub-band in the carrier bandwidth is changed according to the adjustment of the sub-band width and the frequency domain resource position of the sub-band.
Here, the first processing unit is specifically configured to transmit, within a preset time window, a synchronization signal and a system message to the sub-band at a first frequency domain position and a second frequency domain position, respectively, where the first frequency domain position is a position before frequency domain position changes of a synchronization channel and a broadcast channel corresponding to the sub-band, and the second frequency domain position is a position after frequency domain position changes of the synchronization channel and the broadcast channel corresponding to the sub-band.
In the embodiment of the present invention, the system message sent by the first frequency domain position further carries third indication information of the second frequency domain position, and the first frequency domain position does not transmit the synchronization signal and the fourth indication information of the system message after the time window.
The frequency domain position information of the synchronous channel and the broadcast channel in the sub-band is represented by the offset value information between the frequency domain positions of the synchronous channel and the broadcast channel and the center frequency point of the sub-band, or represented by the index of the frequency domain resource block where the synchronous channel or the broadcast channel is located or the adjacent frequency domain resource block. When the frequency domain position information of the synchronization channel and the broadcast channel in the sub-band is represented by the offset value information between the frequency domain positions of the synchronization channel and the broadcast channel and the center frequency point of the sub-band, the offset value information includes: the method comprises the steps of presetting a minimum sub-bandwidth unit, and offsetting the central frequency of a synchronization signal and the minimum sub-bandwidth unit where the synchronization signal is located, wherein the sub-bandwidth of the sub-band is an integral multiple of the minimum sub-bandwidth unit. Specifically, the offset value of the synchronization signal and the center frequency of the minimum sub-bandwidth unit in which the synchronization signal is located is selected from a plurality of offset values that are preset according to the cell specific identifier.
Referring to fig. 5, a terminal according to an embodiment of the present invention includes:
a detecting unit 51, configured to detect a first signal on a system carrier bandwidth, where the first signal includes a synchronization signal and a system message accompanied by the synchronization signal;
an analyzing unit 52, configured to analyze indication information carried in the detected system message, and identify that the detected first signal is a first signal sent by a first time-frequency location or a first signal sent by a second time-frequency location, where the base station may send the first signal at the first time-frequency location and/or the second time-frequency location, and the first time-frequency location and the second time-frequency location are sending locations of the first signal before and after adjustment.
Preferably, the parsing unit is specifically configured to parse the indication information carried in the detected system message; when the indication information indicating that the network simultaneously transmits the first signal at 2 time frequency positions and indicating that the system message is the first system message transmitted at the first time frequency position or the second system message transmitted at the second time frequency position is obtained through analysis, the detected first signal is determined to be the first signal transmitted at the first time frequency position or the first signal transmitted at the second time frequency position according to the indication information obtained through analysis.
Here, the parsing unit is further configured to, when parsing obtains indication information indicating frequency domain position information of another first signal within a carrier in the presence of the another first signal other than the first signal to which the present system message belongs, receive the another first signal according to the frequency domain position information of the another first signal within the carrier.
Preferably, the terminal may further include: a receiving unit, configured to receive, from physical layer downlink control information, prompt information for prompting that a system message is updated, where the physical layer downlink control information is located in a subframe before a subframe where a first system message is located, or the physical layer downlink control information and the first system message are located in the same subframe;
the detection unit is further configured to read, according to the prompt information, information of a second time-frequency domain position, which is carried in the first system message and after the time-frequency position is adjusted, and detect and receive a second synchronization signal and a second system message at the second time-frequency position according to the information of the second time-frequency domain position.
In the embodiment of the invention, the system carrier bandwidth comprises more than two sub-bands, and the sub-carrier intervals of different sub-bands are the same but are used for receiving and transmitting the same or different services; the terminal further comprises:
a second receiving unit, configured to receive, from physical layer downlink control information, prompt information for prompting that a system message is updated, where the physical layer downlink control information is located in a subframe before a subframe in which the updated system message is located, or the physical layer downlink control information and the updated system message are located in the same subframe;
and the determining unit is used for reading the sub-band width information or the frequency domain position information of the sub-band after adjustment carried in the system information according to the prompt information and determining the sub-band after adjustment.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (16)

1. A signal transmission method, comprising:
adjusting the time-frequency position of a first signal from a first time-frequency position to a second time-frequency position, wherein the first signal comprises a synchronous signal and a system message accompanied by the synchronous signal;
transmitting the first signal at a second time-frequency location, comprising: the method comprises the steps of sending a first synchronization signal and a first system message at a first time frequency position, and sending a second synchronization signal and a second system message at a second time frequency position, wherein the first system message and the second system message carry indication information which is used for indicating that the first signal is sent at 2 time frequency positions at the same time and indicating that the system message is the first system message or the second system message.
2. The method of claim 1,
the relative time-frequency position relation between the synchronous signal and the system information accompanied by the synchronous signal is a preset fixed value.
3. The method of claim 1,
the step of sending the first signal at the second time-frequency position further includes:
and after a preset time window, stopping sending the first synchronization signal and the first system message at the first time frequency position, but continuing sending the second synchronization signal and the second system message at the second time frequency position, wherein the second system message carries indication information for indicating that the network only sends the first signal at 1 time frequency position.
4. The method according to claim 1 or 3,
the first system message or the second system message also carries the following information: the system frame number information is used for indicating the indication information of the frequency domain position information of the other first signal in the carrier when the other first signal except the first signal to which the system message belongs exists.
5. The method of claim 1, wherein after the step of adjusting the time-frequency position of the first signal from the first time-frequency position to the second time-frequency position, the method further comprises:
sending prompt information for prompting the update of the system message through physical layer downlink control information, wherein the physical layer downlink control information is positioned in a subframe before a subframe in which the first system message is positioned, or the physical layer downlink control information and the first system message are positioned in the same subframe; and the number of the first and second groups,
and the first system message sent at the first time-frequency position also carries the information of the second time-frequency domain position.
6. A signal receiving method, comprising:
a terminal detects a first signal on a system carrier bandwidth, wherein the first signal comprises a synchronous signal and a system message accompanied by the synchronous signal;
the terminal analyzes the indication information carried in the detected system message, identifies that the detected first signal is the first signal sent by the first time frequency position or the first signal sent by the second time frequency position, and comprises the following steps:
analyzing the indication information carried in the detected system message; when the indication information indicating that the network simultaneously transmits the first signal at 2 time frequency positions and indicating that the system message is the first system message transmitted at the first time frequency position or the second system message transmitted at the second time frequency position is obtained through analysis, the detected first signal is determined to be the first signal transmitted at the first time frequency position or the first signal transmitted at the second time frequency position according to the indication information obtained through analysis.
7. The method according to claim 6, wherein the step of the terminal analyzing the indication information carried in the detected system message and identifying that the detected first signal is the first signal sent by the first time-frequency location or the first signal sent by the second time-frequency location further comprises:
when another first signal except the first signal of the message of the system exists, the indication information of the frequency domain position information of the other first signal in the carrier wave is obtained through analysis, and the other first signal is received according to the frequency domain position information of the other first signal in the carrier wave.
8. The method of claim 6, further comprising:
receiving prompt information for prompting the update of the system message from physical layer downlink control information, wherein the physical layer downlink control information is positioned in a subframe before a subframe in which the first system message is positioned, or the physical layer downlink control information and the first system message are positioned in the same subframe;
and reading the information of the second time-frequency domain position after the time-frequency position adjustment carried in the first system message according to the prompt information, and detecting and receiving a second synchronization signal and a second system message at the second time-frequency position according to the information of the second time-frequency domain position.
9. A base station, comprising:
the position adjusting unit is used for adjusting the time frequency position of a first signal from a first time frequency position to a second time frequency position, wherein the first signal comprises a synchronous signal and a system message accompanied by the synchronous signal;
a sending unit, configured to send the first signal at a second time-frequency position, where the sending unit includes:
the first processing unit is configured to send a first synchronization signal and a first system message at a first time-frequency position, and send a second synchronization signal and a second system message at a second time-frequency position, where the first system message and the second system message carry indication information indicating that the first signal is sent at 2 time-frequency positions at the same time and indicating that the system message is the first system message or the second system message.
10. The base station of claim 9,
the relative time-frequency position relation between the synchronous signal and the system information accompanied by the synchronous signal is a preset fixed value.
11. The base station of claim 9,
the transmitting unit further includes:
and the second processing unit is used for stopping sending the first synchronization signal and the first system message at the first time-frequency position after a preset time window, but continuing sending the second synchronization signal and the second system message at the second time-frequency position, and the second system message carries indication information for indicating that the network only sends the first signal at 1 time-frequency position.
12. The base station according to claim 9 or 11,
the first system message or the second system message also carries the following information: the system frame number information is used for indicating the indication information of the frequency domain position information of the other first signal in the carrier when the other first signal except the first signal to which the system message belongs exists.
13. The base station of claim 9,
the sending unit is further configured to send, through physical layer downlink control information, prompt information for prompting that a system message is updated, where the physical layer downlink control information is located in a subframe before a subframe where a first system message is located, or the physical layer downlink control information and the first system message are located in the same subframe; and the first system message sent at the first time-frequency position also carries the information of the second time-frequency domain position.
14. A terminal, comprising:
a detecting unit, configured to detect a first signal on a system carrier bandwidth, where the first signal includes a synchronization signal and a system message accompanied by the synchronization signal;
the analysis unit is used for analyzing the indication information carried in the detected system message and identifying that the detected first signal is a first signal sent by a first time frequency position or a first signal sent by a second time frequency position;
the analysis unit is specifically configured to analyze the indication information carried in the detected system message; when the indication information indicating that the network simultaneously transmits the first signal at 2 time frequency positions and indicating that the system message is the first system message transmitted at the first time frequency position or the second system message transmitted at the second time frequency position is obtained through analysis, the detected first signal is determined to be the first signal transmitted at the first time frequency position or the first signal transmitted at the second time frequency position according to the indication information obtained through analysis.
15. The terminal of claim 14,
the parsing unit is further configured to, when another first signal other than the first signal to which the present system message belongs is obtained by parsing, obtain indication information indicating frequency domain location information of the another first signal within the carrier, and receive the another first signal according to the frequency domain location information of the another first signal within the carrier.
16. The terminal of claim 14, wherein the terminal further comprises:
a receiving unit, configured to receive, from physical layer downlink control information, prompt information for prompting that a system message is updated, where the physical layer downlink control information is located in a subframe before a subframe where a first system message is located, or the physical layer downlink control information and the first system message are located in the same subframe;
the detection unit is further configured to read, according to the prompt information, information of a second time-frequency domain position, which is carried in the first system message and after the time-frequency position is adjusted, and detect and receive a second synchronization signal and a second system message at the second time-frequency position according to the information of the second time-frequency domain position.
CN201610643165.XA 2016-08-08 2016-08-08 Signal sending method, receiving method, base station and terminal Active CN107708208B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
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CN102132613A (en) * 2008-08-22 2011-07-20 高通股份有限公司 Base station synchronization
CN105474716A (en) * 2013-07-08 2016-04-06 英特尔Ip公司 Synchronizing peer-to-peer operation for outside network coverage and partial network coverage using LTE air interface
WO2016073927A1 (en) * 2014-11-07 2016-05-12 Sharp Laboratories Of America, Inc. Systems and methods for synchronization signal

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102132613A (en) * 2008-08-22 2011-07-20 高通股份有限公司 Base station synchronization
CN105474716A (en) * 2013-07-08 2016-04-06 英特尔Ip公司 Synchronizing peer-to-peer operation for outside network coverage and partial network coverage using LTE air interface
WO2016073927A1 (en) * 2014-11-07 2016-05-12 Sharp Laboratories Of America, Inc. Systems and methods for synchronization signal

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