CN113573386B - Method, terminal device, medium and chip module for searching network - Google Patents
Method, terminal device, medium and chip module for searching network Download PDFInfo
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- CN113573386B CN113573386B CN202110851061.9A CN202110851061A CN113573386B CN 113573386 B CN113573386 B CN 113573386B CN 202110851061 A CN202110851061 A CN 202110851061A CN 113573386 B CN113573386 B CN 113573386B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/20—Selecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
Abstract
The invention provides a method, a terminal, a medium and a chip module for searching a network. The method can be applied to a terminal, and the terminal comprises a physical layer entity and a control layer entity. A physical layer entity receives control signaling from a control layer entity; the physical layer entity determines N frequency points under the first communication system according to the supporting capability of the terminal frequency band, and then the physical layer entity performs network search and synchronization on N cells corresponding to the N frequency points according to the control signaling to obtain the synchronization result of the N cells; and aiming at any one cell in the N cells, when the signal-to-noise ratio in the synchronization result of the cell is greater than or equal to the demodulation threshold of the system broadcast message of the cell, the physical layer entity sends the information of the cell to the control layer entity. The method can be used for improving the network finding success rate in the same frequency interference scene and shortening the network finding time delay.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, a terminal device, a medium, and a chip module for searching a network.
Background
Currently, the third generation partnership project (3 rd generation partnership project,3 gpp) defines two schemes for the fifth generation mobile communication technology (5 th generation mobile communication technology,5 g) New Radio (NR) networking, namely a stand alone networking (SA) and a non-stand alone Networking (NSA). According to different requirements of operators, the actual network deployment of 5G may be that independent networking and non-independent networking cover different areas respectively, or that a certain area covers both independent networking and non-independent networking. And the types of the terminal can be classified into NSA only support, SA only support, and both NSA and SA support according to network access capability. Based on the network coverage mode, in the process of starting up and selecting a network, for initial cell selection, the UE needs to search the full frequency band according to the support capability of its own frequency band so as to find a suitable cell as soon as possible for camping, and then initiates a random access and Attach (Attach) flow to complete registration of a core network.
Because the frequency spectrum resources of operators are very precious, common-frequency networking can be selected in most scenes, interference can inevitably occur, signal quality possibly measured in some areas is good, but measured signal-to-noise ratio is low, and the terminal can not successfully demodulate system information, so that the problems of long time consumption, increased power consumption and the like of the terminal accessing a base station are caused.
Disclosure of Invention
The invention provides a network searching method, terminal equipment, a medium and a chip module, which are used for improving the network searching success rate in the same-frequency interference scene and shortening the network searching time delay.
In a first aspect, the present invention provides a method for searching a network, where the method may be applied to a terminal including a physical layer entity and a control layer entity, and the method includes: a physical layer entity of a terminal receives a control signaling from a control layer entity of the terminal; a physical layer entity of the terminal determines N frequency points under a first communication system according to the supporting capability of the frequency band of the terminal, wherein N is a positive integer; the physical layer entity of the terminal searches and synchronizes the network of N cells corresponding to the N frequency points according to the control signaling to obtain the synchronization result of the N cells; and aiming at any one cell in the N cells, when the signal-to-noise ratio in the synchronization result of the cell is greater than or equal to the demodulation threshold of the system broadcast message of the cell, the physical layer entity of the terminal sends the information of the cell to the control layer entity of the terminal.
The method for searching the network has the advantages that: because the cell reported to the control layer entity by the physical layer entity of the terminal satisfies that the signal-to-noise ratio is greater than or equal to the demodulation threshold of the system broadcast message of the cell, the next physical layer entity can be ensured to correctly demodulate the acquired cell system message, so that a proper cell can be found as soon as possible to reside, the network finding success rate in the same frequency interference scene is improved, and the network finding delay is shortened.
In one possible design, the method further includes: and aiming at any one cell in the N cells, when the signal-to-noise ratio in the synchronization result of the cell is smaller than the demodulation threshold of the system broadcast message of the cell, the physical layer entity of the terminal stops reporting the information of the cell. When the signal-to-noise ratio of the cell is smaller than the demodulation threshold of the system broadcast message of the cell, the physical layer entity does not report the cell to the control layer entity any more, so that the problem of network searching failure caused by incorrect demodulation due to the fact that the signal-to-noise ratio is lower than the demodulation threshold of the system broadcast message in an interference scene is effectively solved, the network searching success rate in a same-frequency interference scene is improved, and the network searching time delay is shortened.
In a possible design, the network searching and synchronizing, by the physical layer entity of the terminal, the N cells corresponding to the N frequency points according to the control signaling to obtain a synchronization result of the N cells, including:
the physical layer entity of the terminal carries out network search on N cells corresponding to the N frequency points according to the control signaling to obtain the RSSI of the N frequency points; the physical layer entity of the terminal performs detection of a primary synchronization signal, detection of a secondary synchronization signal and Physical Broadcast Channel (PBCH) decoding on N cells corresponding to the N frequency points according to the magnitude sequence of the received RSSI signals; and obtaining the synchronization results of the N cells according to the detection result of the primary synchronization signal, the detection result of the secondary synchronization signal and the PBCH decoding result. In the design scheme, in the initial cell network searching process, the terminal needs to detect the downlink synchronization signal of the cell first to obtain time synchronization, frequency synchronization and address information of the cell. For a terminal only supporting the SA networking mode, in the cell search process, the frequency band of the 5G NR is preferentially searched to find a 5G NR cell satisfying the conditions and adopting the SA networking mode for camping. Often, a frequency band configured by a terminal includes multiple frequency points, and the terminal needs to perform primary synchronization signal detection, secondary synchronization signal detection, PBCH decoding one by one, and then perform network searching by reading system broadcast messages after downlink synchronization is completed.
In one possible design, the method further includes: after the physical layer entity of the terminal reports the information of the first cell to the control layer entity of the terminal, the physical layer entity of the terminal starts a timer.
Before the timer arrives, the physical layer entity of the terminal acquires and demodulates the system message of the first cell and reports the system message of the first cell to the control layer entity of the terminal; the control layer entity of the terminal stops the timer and selects the first cell as the resident cell of the terminal; the first cell is a cell with the maximum RSSI in cells reported by a physical layer entity of the terminal. In the design scheme, in the initial cell network searching process, because the cell reported to the control layer entity by the physical layer entity of the terminal meets the condition that the signal-to-noise ratio is greater than or equal to the demodulation threshold of the system broadcast message of the cell, the next maximum probability of the physical layer entity can be ensured to correctly demodulate the acquired system message of the cell before the timer arrives, so that a proper cell can be found as soon as possible to reside, the network searching success rate under the same frequency interference scene is improved, and the network searching time delay is shortened.
In one possible design, the method further includes: when the physical layer entity of the terminal does not acquire the system message of the first cell before the timer arrives, the physical layer entity of the terminal starts the timer after reporting the information of the second cell to the control layer entity of the terminal.
Before the timer arrives, the physical layer entity of the terminal acquires and demodulates the system message of the second cell and reports the system message of the second cell to the control layer entity of the terminal; the control layer entity of the terminal stops the timer and selects the second cell as the resident cell of the terminal; the second cell is a cell with a largest Received Signal Strength Indication (RSSI) among cells reported by a physical layer entity of the terminal, except the first cell. In the design scheme, in the initial cell network searching process, even if a physical layer entity cannot correctly demodulate the acquired system message of the first cell before the timer arrives, the synchronization of the next cell can be continuously carried out according to the RSSI signal strength sequence, so that a proper cell can be found as soon as possible to reside, the network searching success rate in the same frequency interference scene is improved, and the network searching time delay is shortened.
In one possible design, the method further includes: and the terminal sends the synchronization result of the N cells to the network equipment. In this design, in the process of searching for the neighboring cell, the terminal needs to send the synchronization result of N cells to the network device in addition to executing the above method, so that the network device can determine whether to instruct the terminal to perform cell redirection or cell handover.
In one possible design, the first communication system is a fifth generation mobile communication system. In one possible design, the system message is a system information block SIB1. When the system information is a system information block SIB1, the design scheme is suitable for an NR independent networking scene, in the terminal startup network selection process, for initial cell selection, the terminal needs to perform full-band search according to the self-frequency band support capability so as to find a 5G NR cell which meets the conditions and adopts an SA networking mode as soon as possible to reside, and then a random access and attachment (Attach) flow is initiated to complete the registration of a core network.
In a second aspect, an embodiment of the present application provides a terminal, which includes a processor and a memory. Wherein the memory is used to store one or more computer programs; the one or more computer programs stored in the memory, when executed by the processor, enable the terminal to implement the method of any one of the possible designs of the first aspect described above.
In a third aspect, an embodiment of the present application further provides a communication apparatus for searching a network, where the communication apparatus includes a module/unit that performs any one of the possible design methods of the first aspect. These modules/units may be implemented by hardware, or by hardware executing corresponding software.
In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, which includes a computer program and is configured to cause a terminal to perform any one of the possible design methods of any one of the above aspects when the computer program runs on the terminal.
In a fifth aspect, the present application further provides a method comprising a computer program product, when the computer program product runs on a terminal, causing the terminal to perform any one of the possible designs of any one of the above aspects.
In a sixth aspect, embodiments of the present application further provide a chip or a chip module, coupled to a memory, for executing a computer program stored in the memory, so that the terminal executes any one of the possible design methods of any one of the foregoing aspects.
For the beneficial effects of the second to sixth aspects, reference may be made to the description of the first aspect, and repeated descriptions will be omitted.
Drawings
Fig. 1 is a schematic diagram of a cell coverage scheme;
fig. 2 is a schematic diagram of a communication system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a protocol layer entity of a terminal according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a method for searching a network according to an embodiment of the present invention;
fig. 5 is a schematic flowchart of another method for searching a network according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a communication device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another communication device according to an embodiment of the present invention.
Detailed Description
The technical solution in the present application will be described below with reference to the accompanying drawings.
The technical scheme of the invention can be applied to various communication systems, such as: long Term Evolution (LTE) systems, worldwide Interoperability for Microwave Access (WiMAX) communication systems, fifth generation (5 g) systems, such as new radio access technology (NR), and future communication systems, such as sixth generation (6 g) systems.
The invention will present various aspects, embodiments or features around a system that may include a number of devices, components, modules, etc. It is to be understood and appreciated that the various systems may include additional devices, components, modules, etc. and/or may not include all of the devices, components, modules etc. discussed in connection with the figures. Furthermore, a combination of these schemes may also be used.
Hereinafter, some terms referred to hereinafter will be explained to facilitate understanding by those skilled in the art.
1) Signal to noise ratio
The SNR in the present invention may refer to a signal to interference plus noise ratio (SINR) or a signal to noise ratio (SNR), where the SINR may be understood as a ratio of the strength of a useful signal received by a terminal from a network side to interference plus noise. In short, normal communication between the terminal and the base station requires an SINR greater than a set threshold. The SINR reflects the link quality of the current channel, which is an important index for measuring the performance parameters of the UE, and the larger the SINR, the better the link quality of the current channel is reflected, whereas the smaller the SINR, the worse the link quality of the current channel is reflected. SNR refers to the ratio between the level of the useful signal and the level of electromagnetic noise measured under specified conditions.
2) System information block1 (System information block1, SIB 1)
SIB1 in 5G network carries scheduling allowing terminal access and other system information; SIB1 provides the terminals with common radio resource information and information required to restrict unified access control.
3) The synchronization sequence may include a preamble (known periodic sequence), a pilot (pilot), a known aperiodic pseudorandom signal sequence (sounding), and other known time domain sequences.
In NR, a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a demodulation reference signal (DMRS) in a Physical Broadcast Channel (PBCH) collectively constitute a Synchronization Signal Block (SSB).
4) Radio Resource Control (RRC) layer entity
RRC layer entity: the device is a protocol layer entity in the device, and is mainly responsible for generating RRC messages, measuring configuration and reporting, and can also be responsible for other functions: parameters that reflect the quality of service of the data packet/data stream, such as sending dedicated NAS messages, and access capability information of a transmission terminal (UE).
5) Physical (PHY) layer entity
PHY layer entity: a protocol layer entity, which may be referred to as a PHY layer entity or PHY entity, in a device may provide mechanical, electrical, functional and regulatory features for creating, maintaining, tearing down physical links needed to transmit data. In brief, the PHY layer entity ensures that the original data can be transmitted over a variety of physical media.
In the existing technical solution, operators around the world start to deploy 5G SA networks step by step, and since the frequency of the radio spectrum used by the 5G base station is high, the coverage radius of the base station is only 100 to 300 meters, which is significantly smaller than the coverage radius of the 4G base station 1 to 3 kilometers, so that the number of the 5G base stations is 3 to 10 times that of the 4G base stations under the same coverage area. At present, the same frequency networking of the existing network is realized, the rapid increase of the number of base stations means that a large amount of same frequency interference exists in a 5G network, and because the frequency spectrum resources of operators are very precious, the strategy of the same frequency networking can be selected in most scenes, and the inevitable interference occurs among cells. Fig. 1 shows a schematic diagram of co-channel interference occurring between cells, where a value of signal quality measured by a terminal in an overlapping area of each cell is high, but SINR measured by the User Equipment (UE) may be low due to interference occurring in cells 0, 1, and 2 in a scene of co-channel networking. For example, the UE2 and the UE3 in fig. 1 are located at a high probability of co-channel interference, which may result in low SINR measured by the UE2 and the UE 3. In the initial cell network searching process, after completing PBCH decoding of the cell with the maximum RSSI, the physical layer entity of the UE reports the synchronization result of the cell with the maximum RSSI to the control layer entity, and when acquiring the SIB1 message of the cell with the maximum RSSI next, the physical layer may not correctly demodulate the SIB1 message because the cell SINR is lower than the demodulation threshold of the SIB1 message, until the SIB1 protection timer is overtime, and the cell initial search fails. The network searching time is long and the power consumption of the terminal is high.
Therefore, the invention provides a method for searching a network, which can realize the optimization of the network searching process of a 5G terminal under the scene of same frequency interference, and when a physical layer entity of the terminal reports a synchronization result of network searching to a control layer entity of the terminal, a judgment mechanism is added, namely when the signal-to-noise ratio in the synchronization result of a cell is more than or equal to the demodulation threshold of a system broadcast message of the cell, the physical layer entity of the terminal sends the information of the cell to the control layer entity of the terminal; and when the signal-to-noise ratio in the synchronization result of the cell is smaller than the demodulation threshold of the system broadcast message of the cell, the physical layer entity of the terminal stops reporting the information of the cell. Therefore, network finding failure caused by the fact that the signal-to-noise ratio is lower than the demodulation threshold of the SIB1 message under the same frequency interference scene and the SIB1 message cannot be correctly demodulated can be effectively avoided.
The technical solution in the embodiment of the present invention is described below with reference to the drawings in the embodiment of the present invention. In the description of the embodiments of the present invention, the terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the description of the invention and the appended claims, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, such as "one or more", unless the context clearly indicates otherwise. It should also be understood that in the following embodiments of the present invention, "at least one", "one or more" means one or more than two (including two). The term "and/or" is used to describe an association relationship that associates objects, meaning that three relationships may exist; for example, a and/or B, may represent: a exists singly, A and B exist simultaneously, and B exists singly, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present invention. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless otherwise specifically stated. The term "coupled" includes direct coupling and indirect coupling, unless otherwise noted. "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.
In embodiments of the present invention, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described as "exemplary" or "such as" in an embodiment of the present invention is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
Some scenarios in the embodiment of the present invention are described by taking a scenario of an NR network in a wireless communication network as an example, it should be noted that the scheme in the embodiment of the present invention may also be applied to other wireless communication networks, and corresponding names may also be replaced by names of corresponding functions in other wireless communication networks.
For the convenience of understanding the embodiment of the present invention, a communication system applicable to the embodiment of the present invention will be first described in detail by taking the communication system shown in fig. 2 as an example. Fig. 2 shows a schematic diagram of a communication system suitable for the communication method of the embodiment of the present invention. As shown in fig. 2, the communication system 100 includes a network device 102 and a terminal 106, where the network device 102 may be configured with one or more antennas and the terminal may also be configured with one or more antennas. Optionally, the communication system may further include the network device 104, and the network device 104 may also be configured with multiple antennas.
It should be appreciated that network device 102 or network device 104 may also include a number of components associated with signal transmission and reception (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, etc.).
The network device is a device with a wireless transceiving function or a chip that can be set in the device, and the device includes but is not limited to: an evolved Node B (eNB), a Radio Network Controller (RNC), a Node B (NB), a Base Station Controller (BSC), a base transceiver station (base transceiver station, BTS), a home base station (e.g., home evolved Node B, or home Node B, HNB), a Base Band Unit (BBU), etc., and may also be 5G, such as NR, a gbb in the system, or a group (including multiple antennas) of a transmission point (int or trptp), one or more base stations in the 5G system (including multiple antennas), or may also be a panel (including a G panel) of a transmission point (NB), or a distribution Node (distribution Node, RNC), etc.
In some deployments, the gNB may include Centralized Units (CUs) and DUs. The gNB may also include a Radio Unit (RU). The CU implements part of the function of the gNB, and the DU implements part of the function of the gNB, for example, the CU implements Radio Resource Control (RRC) and Packet Data Convergence Protocol (PDCP) layers, and the DU implements Radio Link Control (RLC), medium Access Control (MAC) and Physical (PHY) layers. Since the information of the RRC layer finally becomes or is converted from the information of the PHY layer, under this architecture, higher layer signaling, such as RRC layer signaling or PHCP layer signaling, can also be considered to be transmitted by the DU or by the DU + RU. It will be understood that the network device may be a CU node, or a DU node, or a device comprising a CU node and a DU node. In addition, the CU may be divided into network devices in the access network RAN, or may be divided into network devices in the core network CN, which is not limited herein.
A terminal 106 can also be referred to as a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The terminal in the embodiment of the present invention may be a mobile phone (mobile phone), a tablet computer (Pad), a smart printer, a train detector, a gas station detector, a computer with wireless transceiving function, a Virtual Reality (VR) terminal, an Augmented Reality (AR) terminal, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned driving (self), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety, a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and the like. The embodiment of the invention does not limit the application scenarios. The terminal 106 and the chip that can be disposed on the terminal 106 are collectively referred to as a terminal in the present invention.
It should be understood that fig. 2 is a simplified schematic diagram of an example for ease of understanding only, and that other network devices or other terminals, not shown in fig. 2, may also be included in the communication system.
Fig. 3 shows various protocol layer entities of the terminal 106, which include an application layer entity, a non-access stratum (NAS) entity, a Radio Resource Control (RRC) layer entity, a Packet Data Convergence Protocol (PDCP) layer entity, a Radio Link Control (RLC) layer entity, a Media Access Control (MAC) layer entity, a Physical (PHY) layer entity, and may further include a Service Data Adaptation Protocol (SDAP) layer entity, a vehicle radio communication technology (vehicle to X, V2X) layer entity, or other newly added protocol layer entities (not shown in fig. 3), and related functions and configurations of the respective protocol layer entities are described in the foregoing, which is not repeated. The MAC layer entity, the RLC layer entity, and the PDCP layer entity may form a data link entity, which is also called layer2 (L2), the PHY layer entity is also called layer1 (L1), and the NAS layer entity and the RRC layer entity may form a control layer, which is also called layer3 (L3). The terminal 106 may process the transmitted signaling message or data packet through the protocol layer entities shown in fig. 3.
Wherein, the radio resource control layer entity is used for establishing the connection request. And the physical layer entity is used for searching and synchronizing cell information and initiating a random access process according to the connection request of the wireless resource control layer entity. And the NAS layer is used for triggering the service request signal so that the wireless resource control layer establishes a connection request according to the service request signal.
The method for searching for a network provided by the embodiment of the present invention may be executed by a terminal, and the terminal in the following description of the embodiment of the present invention may be the terminal 106 shown in fig. 2, and the network device in the following description may be the network device 102 shown in fig. 2. It should be understood that, in the present invention, the steps performed by the terminal may also be specifically performed by a module or a component of the terminal, such as a chip in the terminal. The following embodiments are described with the terminal as the execution subject.
As shown in fig. 4, a method for searching a network according to an embodiment of the present invention is shown, where the method includes:
s401, a physical layer entity of the terminal receives a control signaling from a control layer entity of the terminal.
For example, a user powers on a terminal, triggers the terminal to power on and select a network, and in the process of power on and network selection, for initial cell selection, an RRC entity of the terminal notifies a physical layer entity of the terminal to start network searching.
S402, the physical layer entity of the terminal determines N frequency points under the first communication system according to the supporting capability of the self frequency band of the terminal.
Wherein N is a positive integer. For example, the first communication system is a 5G system, and the terminal is a 5G terminal, generally, a frequency band configured by the terminal includes a plurality of frequency points, frequency bands configured by terminals supporting different communication systems are different, and a frequency band configured by the 5G terminal also includes a plurality of frequency points. The terminal needs to perform synchronous detection and Physical Broadcast Channel (PBCH) decoding one by one, and reads the system broadcast message to perform network searching after synchronization is completed.
And S403, the physical layer entity of the terminal performs network search and synchronization on the N cells corresponding to the N frequency points according to the control signaling to obtain synchronization results of the N cells.
In a possible implementation manner, the physical layer entity of the terminal may obtain the synchronization result of the N cells as follows:
the physical layer entity of the terminal firstly carries out network search on N cells corresponding to the N frequency points according to the control signaling to obtain the RSSI of the N frequency points; then, the physical layer entity of the terminal carries out detection of a main synchronization signal, detection of an auxiliary synchronization signal and PBCH decoding on a cell corresponding to each frequency point according to the magnitude sequence of the received RSSI signals; therefore, the synchronization results of the N cells can be obtained according to the detection result of the primary synchronization signal, the detection result of the secondary synchronization signal and the PBCH decoding result.
The PBCH decoding result includes Reference Signal Receiving Power (RSRP), reference Signal Receiving Quality (RSRQ), signal to interference plus noise ratio (SINR), frequency and Physical Cell Identity (PCI), master Information Block (MIB), and the like.
S404, for any cell in the N cells, when the snr of the synchronization result of the cell is greater than or equal to the demodulation threshold of the system broadcast message of the cell, the physical layer entity of the terminal sends the information of the cell to the control layer entity of the terminal.
Illustratively, the first communication system is a 5G system, and the system broadcast message is a SIB1 message. And when the signal-to-noise ratio in the synchronization result of the cell is greater than or equal to the demodulation threshold of the SIB1 message of the cell, the physical layer entity of the terminal sends the information of the cell to the control layer entity of the terminal.
The method for searching the network has the advantages that: because the cell reported to the control layer entity by the physical layer entity of the terminal satisfies that the signal-to-noise ratio is greater than or equal to the demodulation threshold of the system broadcast message of the cell, the next physical layer entity can be ensured to correctly demodulate the acquired cell system message, so that a proper cell can be found as soon as possible to reside, the network finding success rate in the same frequency interference scene is improved, and the network finding delay is shortened.
In one possible implementation, the method further comprises: and aiming at any one cell in the N cells, when the signal-to-noise ratio in the synchronization result of the cell is smaller than the demodulation threshold of the system broadcast message of the cell, the physical layer entity of the terminal stops reporting the information of the cell. When the demodulation threshold of the system broadcast message of the cell is smaller than that of the cell, the physical layer entity does not report the cell to the control layer entity any more, so that the problem of network searching failure caused by incorrect demodulation due to the fact that the signal-to-noise ratio is lower than the demodulation threshold of the system broadcast message in an interference scene is effectively solved, the network searching success rate in a same-frequency interference scene is improved, and the network searching delay is shortened.
In another possible implementation, after the physical layer entity of the terminal reports the information of the cell to the control layer entity of the terminal, the terminal may select a camped cell or a serving cell as follows:
after a physical layer entity of a terminal reports information of a first cell to a control layer entity of the terminal, wherein the first cell is a cell with the maximum RSSI in the cells reported by the physical layer entity of the terminal. Starting a timer by a physical layer entity of a terminal; when the timer reaches, if the physical layer entity of the terminal acquires and demodulates the system message of the first cell, reporting the system message of the first cell to the control layer entity of the terminal; and then the control layer entity of the terminal stops the timer and selects the first cell as the resident cell of the terminal.
In another possible implementation, if the physical layer entity of the terminal does not acquire and demodulate the system message of the first cell, the acquisition and demodulation of the system message of the next cell are performed according to the RSSI signal magnitude order to determine whether the cell can be selected as the camping cell of the terminal. Specifically, before the timer arrives, if the physical layer entity of the terminal does not acquire the system message of the first cell, after the physical layer entity of the terminal reports the information of the second cell to the control layer entity of the terminal, the physical layer entity of the terminal starts the timer; when the timer reaches, if the physical layer entity of the terminal acquires and demodulates the system message of the second cell, reporting the system message of the second cell to the control layer entity of the terminal; and the control layer entity of the terminal stops the timer and selects the second cell as a resident cell of the terminal, wherein the second cell is a cell with the maximum RSSI (received signal strength indicator) except the first cell in the cells reported by the physical layer entity of the terminal. And when the timer reaches, if the physical layer entity of the terminal does not acquire the system message of the second cell, repeating the steps, and acquiring and demodulating the system message of the next cell according to the RSSI signal size sequence until the resident cell or the service cell is selected.
To describe the above embodiments more systematically, the present invention further exemplifies the above method embodiments in conjunction with the method flowchart shown in fig. 5.
S501, when the terminal is powered on by a user, the 5G terminal is triggered to be powered on and network selection is carried out, and the RRC entity of the NR system of the 5G terminal sends a control signaling to the physical layer entity, wherein the control signaling is used for informing the physical layer entity to start the power-on network selection.
S502, the physical layer entity of the 5G terminal scans the RSSI of each NR frequency point according to a protocol, and performs network search and synchronization on N cells corresponding to the N frequency points according to the received RSSI signal strength sequence to obtain the synchronization result of the N cells.
Specifically, the physical layer entity of the 5G terminal performs primary synchronization signal detection, secondary synchronization signal detection and PBCH decoding on N cells corresponding to the N frequency points according to the received RSSI signal strength sequence; and obtaining the synchronization results of the N cells according to the detection result of the primary synchronization signal, the detection result of the secondary synchronization signal and the PBCH decoding result.
For the initial cell selection, the UE needs to perform full band search according to the support capability of its own frequency band, and for a terminal only supporting the SA networking mode, in the cell search process, the UE preferentially searches for a frequency band of 5G NR to find a 5G NR cell that satisfies the conditions and uses the SA networking mode to perform camping. In one possible implementation, the procedure of synchronizing NR cells includes PSS detection, SSS detection, PBCH decoding.
And S503, the physical layer entity of the 5G terminal selects a cell with the maximum RSSI value from the N cells as a target cell, namely, whether the RSSI value of the target cell is the maximum RSSI value in the current cell set is judged, if so, S504 is executed, and otherwise, the processing is not carried out.
S504, before the physical layer entity of the 5G terminal reports the synchronization result of the target cell, it determines whether the SINR of the target cell is greater than or equal to SIB1 of the target cell, if so, S505 is executed, otherwise, S506 is executed.
And S505, when the searched SINR of the first cell is greater than or equal to the demodulation threshold of the SIB1 message of the cell, the physical layer entity of the 5G terminal reports the synchronization result of the cell to the RRC entity.
S506, when the SINR of the first cell is lower than the demodulation threshold of the SIB1 message of the cell, the physical layer entity of the 5G terminal does not report the cell to the RRC entity, filters the information of the target cell from the cell set, and returns to perform S503, i.e., enters synchronization of the target cell with the next highest RSSI value.
S507, the RRC entity of the 5G terminal obtains the cell synchronization result reported by the physical layer entity of the 5G terminal, informs the physical layer entity of the 5G terminal to continuously acquire the SIB1 message of the cell, and starts an SIB1 protection timer.
S508, the physical layer entity of the 5G terminal judges whether the SIB1 message of the cell is acquired before the SIB1 protection timer arrives. If so, executing S509, otherwise, if the SIB1 protection timer is overtime, if the physical layer entity of the 5G terminal fails to successfully acquire the SIB1 message of the cell, returning to execute S503.
S509, in the SIB1 protection timer, if the physical layer entity of the 5G terminal successfully acquires the SIB1 message of the cell and reports the SIB1 message to the RRC entity, the initial cell search is completed, and the RRC entity stops the SIB1 protection timer.
In the method, in the network searching process of the initial cell, through a newly added judgment mechanism, when the SINR of the PBCH of the searched cell is lower than the demodulation threshold of the SIB1 message of the terminal, the physical layer of the terminal does not report the cell to the control layer, and the synchronization and the report of the next cell are continued, so that the network searching success rate can be improved, and the network searching time can be saved.
In other possible embodiments, the above method for searching for a network is also applicable to the neighbor cell search procedure. The difference between the neighboring cell search process and the method embodiment shown in fig. 5 is that the 5G terminal further needs to send a cell synchronization result to the network side device, so that the network side device can confirm whether to instruct the terminal to perform cell redirection or cell handover.
In order to implement each function in the communication method provided in the embodiment of the present application, the terminal may include a hardware structure and/or a software module, and implement each function in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether any of the above functions is implemented as a hardware structure, a software module, or a combination of a hardware structure and a software module depends upon the particular application and design constraints imposed on the technical solution.
Similar to the concept of the foregoing embodiment, the embodiment of the present application further provides a communication apparatus, where the communication apparatus 600 is configured to implement the function of the terminal in the foregoing method. The communication apparatus 600 may be a terminal device, or an apparatus in a terminal device. The apparatus may be a system-on-a-chip. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices.
In one example, as shown in fig. 6, the communication apparatus 600 includes a receiving module 601, a determining module 602, a searching and synchronizing module 603, and a transmitting module 604.
A receiving module 601, configured to receive a control signaling from a control layer entity of the terminal; a determining module 602, configured to determine N frequency points in the first communication system according to a supporting capability of the terminal itself, where N is a positive integer. A searching and synchronizing module 603, configured to perform network searching and synchronizing on N cells corresponding to the N frequency points according to the control signaling, so as to obtain synchronization results of the N cells; a sending module 604, configured to send, for any one of the N cells, information of the cell to a control layer entity of the terminal when a signal-to-noise ratio in a synchronization result of the cell is greater than or equal to a demodulation threshold of a system broadcast message of the cell.
In a possible implementation, the sending module 604 is further configured to: and for any cell in the N cells, when the signal-to-noise ratio in the synchronization result of the cell is smaller than the demodulation threshold of the system broadcast message of the cell, stopping reporting the information of the cell.
In another possible implementation, the searching and synchronizing module 603 is specifically configured to: according to the control signaling, network searching is carried out on N cells corresponding to the N frequency points, and the RSSI of the N frequency points is obtained; according to the magnitude sequence of the received RSSI signals, carrying out detection of a main synchronizing signal, detection of an auxiliary synchronizing signal and decoding of a physical broadcast channel PBCH on N cells corresponding to the N frequency points; acquiring system broadcast messages of the N cells; and obtaining the synchronization result of the N cells according to the detection result of the primary synchronization signal, the detection result of the secondary synchronization signal, the PBCH decoding result and the system broadcast message of the N cells.
In other possible embodiments, the apparatus further comprises a demodulation module 605:
the demodulation module 605 is configured to start a timer after reporting the information of the first cell to the control layer entity of the terminal; acquiring and demodulating system information of a first cell before the timer arrives;
the sending module 604 is further configured to report the system message of the first cell to a control layer entity of the terminal;
the apparatus also includes a cell selection module 606; the cell selection module 606 is configured to stop the timer, and select the first cell as a cell where the terminal resides; the first cell is a cell with the maximum RSSI in cells reported by a physical layer entity of the terminal.
In a possible implementation, the demodulation module 605 is further configured to:
when the physical layer entity of the terminal does not acquire the system message of the first cell before the timer reaches, after the physical layer entity of the terminal reports the information of the second cell to the control layer entity of the terminal, the physical layer entity of the terminal starts the timer; before the timer arrives, the physical layer entity of the terminal acquires and demodulates the system message of the second cell;
the sending module 604 is further configured to report the system message of the second cell to the control layer entity of the terminal;
the cell selection module 606 is configured to stop the timer, and select the second cell as a cell where the terminal resides;
the second cell is a cell with the maximum RSSI except the first cell in cells reported by a physical layer entity of the terminal.
In yet another possible implementation, the sending module 604 is further configured to: and sending the synchronization result of the N cells.
For the specific implementation and beneficial effects of the above units, see the description in the method related to fig. 4 above.
The division of the modules in the embodiments of the present application is schematic, and only one logical function division is provided, and in actual implementation, there may be another division manner, and in addition, each functional module in each embodiment of the present application may be integrated in one processor, may also exist alone physically, or may also be integrated in one module by two or more modules. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.
In yet another example, as shown in fig. 7, the communications apparatus 700 includes at least one processor 710 and memory 720. The memory 720 stores therein a computer program. A memory 720 is coupled to the processor 710. The communication device 700 may refer to the above terminal, and the coupling in the embodiment of the present invention is a spaced coupling or communication connection between devices, units or modules, and may be in an electrical, mechanical or other form, which is used for information interaction between the devices, units or modules. As another implementation, the memory 720 may also be located outside of the communication device 1100. Processor 710 may operate in conjunction with memory 720. Processor 710 may invoke computer programs stored in memory 720. At least one of the at least one memory may be included in the processor.
In some embodiments, communications apparatus 1100 may also include a communications interface 730 for communicating with other devices over a transmission medium, such that the apparatus used in communications apparatus 1100 may communicate with other devices. Illustratively, the communication interface 730 may be a transceiver, circuit, bus, module, or other type of communication interface, which may be other terminals. The processor 710 utilizes the communication interface 730 to send and receive information and is used to implement the methods in the embodiments described above. Illustratively, communication interface 730 is configured to receive resource indicator information. Also exemplary, communication interface 730 is for transmitting data.
In the embodiments of the present application, the processor may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the methods, steps, and logic blocks disclosed in the embodiments of the present application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor.
In the embodiment of the present application, the memory may be a nonvolatile memory, such as a Hard Disk Drive (HDD) or a solid-state drive (SSD), and may also be a volatile memory (RAM), for example. The memory is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory in the embodiments of the present application may also be a circuit or any other device capable of implementing a storage function for storing a computer program and/or data.
The invention also provides a computer-readable medium, on which a computer program is stored, which, when executed by a computer, implements the method of the above-described method embodiments.
The invention also provides a computer program product which, when executed by a computer, implements the method of the above method embodiments.
The invention also provides a chip or a chip module, which is coupled with the memory and is used for executing the computer program stored in the memory, so that the terminal executes the method of the method embodiment.
The method provided by the embodiment of the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions according to the embodiments of the present invention are wholly or partially generated when the computer program is loaded and executed on a computer. The computer may be a general purpose computer, special purpose computer, computer network, network appliance, user equipment, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any medium that can be accessed by a computer or a data storage device, including one or more media integrated servers, data centers, and the like. The media may be magnetic media (e.g., floppy disks, hard disks, tapes), optical media (e.g., digital Video Disks (DVDs)), or semiconductor media (e.g., SSDs), among others.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (15)
1. A method of searching a network, the method comprising:
a physical layer entity of a terminal receives a control signaling from a control layer entity of the terminal;
the physical layer entity of the terminal determines N frequency points under a first communication system according to the supporting capability of the self frequency band of the terminal, wherein N is a positive integer, and the first communication system is a wireless communication system with the same frequency networking;
a physical layer entity of the terminal carries out network search on N cells corresponding to the N frequency points according to the control signaling to obtain Received Signal Strength Indication (RSSI) of the N frequency points;
the physical layer entity of the terminal detects the main synchronous signals, detects the auxiliary synchronous signals and decodes the physical broadcast channel PBCH for the N cells corresponding to the N frequency points according to the size sequence of the received RSSI signals;
obtaining the synchronization results of the N cells according to the detection result of the primary synchronization signal, the detection result of the secondary synchronization signal and the PBCH decoding result;
and aiming at any one cell in the N cells, when the signal-to-noise ratio in the synchronization result of the cell is greater than or equal to the demodulation threshold of the system broadcast message of the cell, the physical layer entity of the terminal sends the information of the cell to the control layer entity of the terminal.
2. The method of claim 1, further comprising:
and aiming at any one cell in the N cells, when the signal-to-noise ratio in the synchronization result of the cell is smaller than the demodulation threshold of the system broadcast message of the cell, the physical layer entity of the terminal stops reporting the information of the cell.
3. The method of claim 1, further comprising:
after the physical layer entity of the terminal reports the information of the first cell to the control layer entity of the terminal, the physical layer entity of the terminal starts a timer;
before the timer reaches, the physical layer entity of the terminal acquires and demodulates the system message of the first cell, and reports the system message of the first cell to the control layer entity of the terminal;
the control layer entity of the terminal stops the timer and selects the first cell as the resident cell of the terminal;
the first cell is a cell with the maximum RSSI in cells reported by a physical layer entity of the terminal.
4. The method of claim 3, further comprising:
when the physical layer entity of the terminal does not acquire the system message of the first cell before the timer arrives, the physical layer entity of the terminal starts the timer after reporting the information of the second cell to the control layer entity of the terminal;
before the timer reaches, the physical layer entity of the terminal acquires and demodulates the system message of the second cell, and reports the system message of the second cell to the control layer entity of the terminal;
the control layer entity of the terminal stops the timer and selects the second cell as the resident cell of the terminal;
the second cell is a cell with the maximum RSSI except the first cell in cells reported by a physical layer entity of the terminal.
5. The method according to claim 1 or 2, characterized in that the method further comprises:
and the terminal sends the synchronization result of the N cells to network equipment.
6. The method according to claim 1 or 2, wherein the first communication system is a fifth generation mobile communication system.
7. The method according to claim 3 or 4, wherein the system message is a system information block SIB1.
8. An apparatus for searching a network, the apparatus comprising:
a receiving module, configured to receive a control signaling from a control layer entity of a terminal;
the determining module is used for determining N frequency points under a first communication system according to the supporting capability of the frequency band of the terminal, wherein N is a positive integer;
the searching and synchronizing module is used for carrying out network searching on N cells corresponding to the N frequency points according to the control signaling to obtain Received Signal Strength Indication (RSSI) of the N frequency points;
according to the magnitude sequence of the received RSSI signals, carrying out detection of a main synchronizing signal, detection of an auxiliary synchronizing signal and decoding of a physical broadcast channel PBCH on N cells corresponding to the N frequency points;
obtaining the synchronization results of N cells according to the detection result of the primary synchronization signal, the detection result of the secondary synchronization signal and the PBCH decoding result;
a sending module, configured to send, for any one of the N cells, information of the cell to a control layer entity of the terminal when a signal-to-noise ratio in a synchronization result of the cell is greater than or equal to a demodulation threshold of a system broadcast message of the cell.
9. The apparatus of claim 8, wherein the sending module is further configured to:
and for any cell in the N cells, when the signal-to-noise ratio in the synchronization result of the cell is smaller than the demodulation threshold of the system broadcast message of the cell, stopping reporting the information of the cell.
10. The apparatus of claim 8, further comprising a demodulation module:
the demodulation module is used for starting a timer after reporting the information of the first cell to a control layer entity of the terminal; acquiring and demodulating system information of a first cell before the timer arrives;
the sending module is further configured to report the system message of the first cell to a control layer entity of the terminal;
the apparatus also includes a cell selection module;
the cell selection module is configured to stop the timer, and select the first cell as a cell where the terminal resides;
the first cell is a cell with the maximum RSSI in cells reported by a physical layer entity of the terminal.
11. The apparatus of claim 10, wherein the demodulation module is further configured to:
when the physical layer entity of the terminal does not acquire the system message of the first cell before the timer reaches, after the physical layer entity of the terminal reports the information of the second cell to the control layer entity of the terminal, the physical layer entity of the terminal starts the timer; before the timer arrives, the physical layer entity of the terminal acquires and demodulates the system message of the second cell;
the sending module is further configured to report the system message of the second cell to a control layer entity of the terminal;
the cell selection module is configured to stop the timer, and select the second cell as a cell where the terminal resides;
the second cell is a cell with the maximum RSSI except the first cell in cells reported by a physical layer entity of the terminal.
12. The apparatus of claim 8 or 9, wherein the sending module is further configured to:
and sending the synchronization result of the N cells.
13. A terminal, characterized in that it comprises a memory and a processor, the memory having stored thereon a computer program being executable on the processor, the computer program, when being executed by the processor, causing the terminal to carry out the method of any of claims 1 to 7.
14. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1 to 7.
15. A chip module, wherein the chip module is coupled to a memory for reading and executing program instructions stored in the memory to implement the method according to any one of claims 1 to 7.
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| CN103546940A (en) * | 2012-07-17 | 2014-01-29 | 电信科学技术研究院 | Method and device for searching cells in sensing system |
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