CN112543500B

CN112543500B - Random access method, random access device, computer equipment and storage medium

Info

Publication number: CN112543500B
Application number: CN201910893398.9A
Authority: CN
Inventors: 彭岳峰; 杨小平; 周雄; 张全君
Original assignee: Guangzhou Haige Communication Group Inc Co
Current assignee: Guangzhou Haige Communication Group Inc Co
Priority date: 2019-09-20
Filing date: 2019-09-20
Publication date: 2023-10-10
Anticipated expiration: 2039-09-20
Also published as: CN112543500A

Abstract

The application relates to a random access method, a random access device, computer equipment and a storage medium. The method comprises the following steps: the base station reserves mirror image resources for the original resources by determining the original resources corresponding to the parameter information after initializing the system, respectively sends downlink synchronous signals to the terminal by the original resources and the mirror image resources, receives the downlink synchronous signals sent by the base station, demodulates the downlink synchronous signals transmitted by the original resources and/or the downlink synchronous signals transmitted by the mirror image resources, determines target transmission resources, and executes a random access process with the terminal by the target transmission resources. In the application, the base station reserves the mirror image resource for the original resource configuration according to the initialized system parameter information, and sends the downlink synchronous signal to the terminal through the synchronization of the original resource and the mirror image resource, thereby realizing the diversity gain of the base station and the two sides of the terminal, enhancing the decoding success rate of the terminal in the random access network, and obviously improving the robustness of the random access process of the terminal in the interference environment.

Description

Random access method, random access device, computer equipment and storage medium

Technical Field

The present application relates to the field of communications technologies, and in particular, to a random access method, a device, a computer device, and a storage medium.

Background

In recent years, with the development of the mobile internet and the internet of things, the development and transformation of wireless communication technology are driven. The 3GPP standards organization has completed 3GPP NR Release15 standard formulation at the end of 2018. In line with the great trend of the integration of the military and the civilian, the civil advanced technology can be introduced into the field of private network communication.

In the civil 5G NR standard, in the process of the terminal initial random access network, firstly, the downlink synchronous signal sent by the base station is received, the downlink synchronous signal is demodulated, then the random access request is sent to the base station, the random access request response returned by the base station is received, the connection establishment request response returned by the base station is received by sending the connection establishment request again, and the process of the random access network is realized. The entire random access network procedure is transmitted in the initial part of the bandwidth. Thus, during initial access of the terminal to the network, the initial partial bandwidth configuration affects the network access performance of the terminal.

However, in the private network communication field, the terminal has the capability of receiving the entire bandwidth signal, and the entire bandwidth is extremely easy to be interfered by narrowband, wideband or other maliciousness, so that the terminal fails to access the network randomly.

Disclosure of Invention

Based on this, it is necessary to provide a random access method, apparatus, computer device and storage medium in order to solve the above technical problems.

In a first aspect, a random access method is provided, the method including:

determining original resources corresponding to the parameter information after initializing the system; the parameter information comprises uplink air interface configuration information and downlink air interface configuration information;

reserving mirror image resources for original resources; the time domain positions of the original resource and the mirror image resource are the same, the frequency domain positions are different, and the frequency domain positions of the original resource and the mirror image resource are not overlapped;

respectively sending downlink synchronous signals to the terminal through the original resource and the mirror image resource; the downlink synchronous signal is used for terminal demodulation to obtain a target transmission resource;

and executing a random access process with the terminal through the target transmission resource.

In one embodiment, the reserving the mirror resource for the original resource includes:

taking the center frequency point of the current carrier of the original resource as a symmetry axis, and reserving mirror image resources for the original resource;

if the original resource is positioned at the low frequency side of the symmetry axis, the mirror image resource is positioned at the high frequency side of the symmetry axis; alternatively, if the original resource is located on the high frequency side of the symmetry axis, the mirror resource is located on the low frequency side of the symmetry axis.

In one embodiment, after reserving the mirror resource for the original resource, the method further includes:

and if the position of the mirror image resource is not in the defined position range of the global synchronization channel number GSCN, adjusting the frequency domain position of the mirror image resource according to a preset rule.

In one embodiment, the adjusting the frequency domain position of the mirror resource according to the preset rule includes:

in the direction close to the carrier central axis, determining a GSCN position closest to the carrier central axis to fill the mirror image resource according to the preset mirror image resource offset; the central axis of the carrier is symmetrically extracted by taking the central frequency point of the current carrier of the original resource.

in the direction away from the carrier central axis, determining a GSCN position closest to the carrier central axis to fill the mirror image resource according to the preset mirror image resource offset; the central axis of the carrier is symmetrically extracted by taking the central frequency point of the current carrier of the original resource.

In one embodiment, the target transmission resource is an initial configuration resource that the terminal demodulates according to the downlink synchronization signal transmitted by the original resource; or the target transmission resource is the mirror image configuration resource demodulated by the terminal according to the downlink synchronous signal transmitted by the mirror image resource.

In a second aspect, a random access method is provided, the method comprising:

receiving a downlink synchronous signal sent by a base station through an original resource and a mirror image resource; the time domain positions of the original resource and the mirror image resource are the same, the frequency domain positions are different, and the frequency domain positions of the original resource and the mirror image resource are not overlapped;

demodulating the downlink synchronous signal transmitted by the original resource and/or the downlink synchronous signal transmitted by the mirror image resource to determine a target transmission resource;

and executing a random access process with the base station through the target transmission resource.

In one embodiment, the determining the target transmission resource by demodulating the downlink synchronization signal transmitted by the original resource and/or the downlink synchronization signal transmitted by the mirror resource includes:

demodulating the downlink synchronous signal transmitted by the original resource;

if the original resource is successfully demodulated, determining an initial configuration resource obtained by demodulating a downlink synchronous signal transmitted by the original resource as a target transmission resource;

if the original resource fails to demodulate, demodulating the downlink synchronous signal transmitted by the mirror resource, and determining the mirror configuration resource obtained by demodulating the downlink synchronous signal transmitted by the mirror resource as the target transmission resource.

In one embodiment, after demodulating the downlink synchronization signal transmitted by the mirror resource, the method further includes:

If the mirror image resource demodulation fails, searching the synchronous signal grid, and returning to the step of executing the demodulation of the downlink synchronous signal transmitted by the original resource and/or the downlink synchronous signal transmitted by the mirror image resource to determine the target transmission resource.

In a third aspect, there is provided a random access apparatus comprising:

the determining module is used for determining original resources corresponding to the parameter information after the system is initialized; the parameter information comprises uplink air interface configuration information and downlink air interface configuration information;

the mirror image resource reservation module is used for reserving mirror image resources for the original resources; the time domain positions of the original resource and the mirror image resource are the same, the frequency domain positions are different, and the frequency domain positions of the original resource and the mirror image resource are not overlapped;

the sending module is used for respectively sending downlink synchronous signals to the terminal through the original resource and the mirror image resource; the downlink synchronous signal is used for terminal demodulation to obtain a target transmission resource;

and the transmission module is used for executing a random access process with the terminal through the target transmission resource.

In a fourth aspect, there is provided a random access apparatus comprising:

the receiving module is used for receiving downlink synchronous signals sent by the base station through the original resources and the mirror image resources; the time domain positions of the original resource and the mirror image resource are the same, the frequency domain positions are different, and the frequency domain positions of the original resource and the mirror image resource are not overlapped;

The demodulation module is used for demodulating the downlink synchronous signal transmitted by the original resource and/or the downlink synchronous signal transmitted by the mirror image resource, and determining a target transmission resource;

and the transmission module is used for executing a random access process with the base station through the target transmission resource.

In a fifth aspect, a computer device is provided, comprising a memory storing a computer program and a processor implementing the random access method provided by any one of the embodiments of the first aspect, when the computer program is executed.

In a sixth aspect, a computer readable storage medium is provided, on which a computer program is stored, which when executed by a processor implements the random access method provided by any one of the embodiments of the first aspect.

According to the random access method, the device, the computer equipment and the storage medium, the base station reserves mirror resources for the original resources by determining the original resources corresponding to the parameter information after initializing the system, the original resources and the mirror resources are used for respectively sending downlink synchronous signals to the terminal, the terminal receives the downlink synchronous signals sent by the base station, demodulates the downlink synchronous signals transmitted by the original resources and/or the downlink synchronous signals transmitted by the mirror resources, determines target transmission resources, and the base station executes a random access process with the terminal through the target transmission resources. In the application, the base station reserves the mirror image resource for the original resource configuration according to the initialized system parameter information, and sends the downlink synchronous signal to the terminal through the synchronization of the original resource and the mirror image resource, thereby realizing the diversity gain of the base station and the two sides of the terminal, enhancing the decoding success rate of the terminal in the random access network, and obviously improving the robustness of the random access process of the terminal in the interference environment.

Drawings

FIG. 1 is an application environment diagram of a random access method in one embodiment;

fig. 2 is a message transmission schematic diagram of a random access method according to an embodiment;

FIG. 3 is a flow chart of a random access method in one embodiment;

FIG. 4 is a diagram illustrating a random access method mirror resource allocation in one embodiment;

FIG. 5 is a diagram illustrating a random access method mirror resource adjustment in one embodiment;

FIG. 6 is a diagram illustrating a random access method mirror resource adjustment in another embodiment;

fig. 7 is a flow chart of a random access method in another embodiment;

fig. 8 is a flow chart of a random access method in another embodiment;

fig. 9 is a flowchart illustrating the overall steps of a random access method according to another embodiment;

fig. 10 is a block diagram of a random access device in one embodiment;

fig. 11 is a block diagram of a random access device according to another embodiment;

fig. 12 is a block diagram of a random access device according to another embodiment;

fig. 13 is a block diagram of a random access device according to another embodiment;

fig. 14 is a block diagram of a random access device according to another embodiment;

FIG. 15 is an internal block diagram of a computer device in one embodiment;

Fig. 16 is an internal structural view of a computer device in another embodiment.

Detailed Description

The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

The random access method provided by the application can be applied to an application environment shown in figure 1. Wherein the terminal 102 communicates with the base station 101 via a wireless network. The base station 101 reserves mirror resources for the original resources by determining the original resources corresponding to the parameter information after initializing the system, respectively sends downlink synchronization signals to the terminal 102 through the original resources and the mirror resources, receives the downlink synchronization signals sent by the base station 101, demodulates the downlink synchronization signals transmitted by the original resources and/or the downlink synchronization signals transmitted by the mirror resources, determines target transmission resources, and the base station 101 performs a random access process with the terminal 102 through the target transmission resources. The terminal 102 may be, but not limited to, various personal computers, notebook computers, smartphones, tablet computers, and portable wearable devices, and the base station 101 may be implemented by a stand-alone server or a server cluster composed of a plurality of servers.

Specifically, in the 5G NR system, a certain correspondence exists between the synchronization signal block (Synchronization signal block, SSB) and the remaining minimum system information (Remaining Minimum System Information, RMSI) on the time-frequency resource, and the multiplexing relationship is defined in the 3GPP R15 TS38.213 protocol. In the random access process of the terminal, the downlink control signaling comprises control signaling (Type 0-Physical Downlink Control Channel, type 0-PDCCH) for demodulation of RMSI, control signaling (Type 1-Physical Downlink Control Channel, type 1-PDCCH) of Message2 (Message 2, msg 2)/Message 4 (Message 4, msg 4), and time-frequency resources of the Type0-PDCCH and the Type1-PDCCH are all within an initial downlink fractional bandwidth (Initial Downlink Bandwidth Part, initialDownlinkBWP). For uplink data in the random access procedure, the uplink data mainly includes a random access channel (Random Access Channel, RACH) and a Message3 (Msg 3), and the transmissions of the uplink data are also located in an uplink initial partial bandwidth (Initial Uplink Bandwidth Part, initiallinkbwp). Terminal side random access procedure definition in NR is shown in table 1.

TABLE 1

The random access procedure, message transmission diagram is shown in fig. 2. As can be seen from fig. 2, in the downlink aspect, the resource affecting the random access of the terminal is SSB/CORESET0 (i.e., initialDownlinkBWP); in the uplink aspect, the resource affecting the random access of the terminal is InitialUPlinkBWP. For a time division duplex (Time Division Duplexing, TDD) system, there is a coincidence of IDs of uplink partial bandwidths corresponding to IDs of downlink partial bandwidths defined in 5G NR, and coincidence of center frequency points. For example, the IDs of the downlink initial part bandwidth and the uplink initial part bandwidth may be set to 0. In the private network field, when there is strong narrowband interference, especially to the initial partial bandwidth, the terminal side may not be able to successfully complete the random access procedure. Under the scene, the random access method, the device, the computer equipment and the storage medium are provided, and important resources in the random access process are transmitted in a diversity mode on a frequency domain by sacrificing part of common resources, so that the success rate of the random access of the terminal is improved.

In one embodiment, as shown in fig. 3, a random access method is provided, and the method is applied to the base station 101 in fig. 1, for illustration, and includes the following steps:

s301, determining original resources corresponding to parameter information after initializing a system; the parameter information comprises uplink air interface configuration information and downlink air interface configuration information.

The parameter information refers to system parameters set for the cell, and comprises uplink air interface configuration parameters and downlink air interface configuration parameters; for example, the parameter information may specifically include SSB, MIB, RMSI, system information block 1 (System Information Block, sib1), primary synchronization signal (Primary synchronization signal, PSS), secondary synchronization signal (Secondary synchronization signal, SSS), corresponding physical downlink shared CHannel (Physical Downlink Shared chnnel, PDSCH), initialDownlinkBWP, initalUPlinkBWP, CORSET, PDCCH, and the like.

In this embodiment, for example, in a process of the terminal randomly accessing the network, the downlink control signaling includes: downlink synchronization signaling for demodulation of SSB, control signaling Type0-PDCCH for demodulation of RMSI, control signaling Type1-PDCCH for request response Msg2 and radio resource control connection response Msg4 of random access channel. The time-frequency resources of the Type0-PDCCH and the Type1-PDCCH are within InitialDownlinkBWP. The uplink data in the random access process mainly comprises a request Msg1 of a random access channel sent by a terminal side and a radio resource control connection request Msg3, and the transmission of the request Msg1 and the transmission of the request Msg3 are both positioned in an InitialUPlinkBWP. After the initialization configuration is completed for the above parameters, all the system parameters, the parameter positions, and the corresponding uplink/downlink bandwidths, channels, and the like are determined as the original resources in this embodiment, and it should be noted that, when the system parameters are initialized, the frequency domain positions of the original resources are located at the two ends of the carrier bandwidth as much as possible. The present embodiment is not limited thereto.

S302, reserving mirror image resources for original resources; the time domain positions of the original resource and the mirror image resource are the same, the frequency domain positions are different, and the frequency domain positions of the original resource and the mirror image resource are not overlapped.

The mirror image resource refers to a resource which is identical to the original resource except for the frequency domain position, has the same time domain position and has consistent content; the setting method of the position of the mirror image resource comprises the steps that the original low-frequency resource mirrors to the high-frequency resource by taking the center frequency point of the current carrier bandwidth as a symmetry axis; or the current carrier bandwidth center frequency point can be taken as a symmetry axis, and the original high-frequency resource is mirrored to the low-frequency resource; or the mirror image resource position can be set by obtaining a position with the same time domain and different frequency domains through calculation rules.

In this embodiment, as shown in fig. 4, for example, the original resource is located in the low frequency portion of the time-frequency resource, the carrier center is taken as a symmetry axis, the time-frequency resource of the low frequency portion is mirrored to the high frequency portion, so as to implement the mirror image resource configuration from the original low frequency resource to the high frequency resource, the mirror image time-frequency resources of SSB, CORSET0, SIB1 and the like are reserved, further, in the reserved mirror image time-frequency resource, other resources are used in a staggered manner, the reserved resources are not allowed to be occupied, and when the system parameters are initialized, the frequency domain positions of the original resource are located at two ends of the carrier bandwidth as far as possible, so that the frequency domain positions of the original resource and the mirror image resource do not overlap, if the phenomenon that the frequency domain positions overlap occurs, the corresponding mirror image resource cannot be configured, alternatively, in order to reduce the occupation rate of the mirror image resource on the frequency domain as far as possible, in this embodiment, the SSB and CORSET0 multiplexing mode is the pattern1. The present embodiment is not limited thereto.

S303, respectively sending downlink synchronous signals to the terminal through the original resource and the mirror image resource; the downlink synchronous signal is used for terminal demodulation to obtain the target transmission resource.

The downlink synchronization signal refers to a downlink synchronization signal carrying SSB, MIB and SIB1 and a CORSET0 carrying RMSI, where the downlink synchronization signal is used to make the terminal use the same time-frequency position as the base station, and InitialDownlinkBWP, initalUPlinkBWP is carried in the RMSI in Coreset 0. The target transmission resource refers to a transmission resource determined by the terminal successfully demodulating MIB and SIB1 in the original resource or the mirror resource.

In this embodiment, the base station sends the downlink synchronization signaling carrying SSB, MIB and SIB1 and the CORSET0 carrying RMSI to the terminal through the original resource and the mirror resource respectively, and the terminal firstly selects to demodulate MIB and SIB1 in the original resource, and if demodulation is successful in the original resource, determines that the original resource is the target transmission resource; if demodulation in the original resource fails, the MIB and the SIB1 are selected to be demodulated in the mirror resource, if demodulation in the mirror resource is successful, the mirror resource is determined to be a target transmission resource, and then the terminal executes a random access network process on the InitialUPlinkBWP corresponding to the target transmission resource according to the determined target transmission resource. The present embodiment is not limited thereto.

S304, executing a random access process with the terminal through the target transmission resource.

The target transmission resource refers to a transmission resource determined by the terminal successfully demodulating the MIB, SIB1 and the like in the original resource or the mirror resource, and the target transmission resource is the original resource or the mirror resource. The random access procedure refers to a procedure of establishing connection with a series of radio resource control such as an Msg1 carrying RACH and an Msg3 carrying RRC initiated to a base station, and an Msg2 carrying RAR and an RRC response Msg4 returned to the terminal by the base station after the terminal demodulates MIB and SIB1 on a target transmission resource.

In the random access method provided in this embodiment, after a terminal successfully demodulates MIB and SIB1 in an original resource or a mirror resource to determine a target transmission resource, a base station receives a random access channel request Msg1 sent by the terminal on the target transmission resource, where the Msg1 carries a random access preamble, the base station returns a random access response Msg2 to the terminal according to the Msg1, where the Msg2 carries Time Advance (TA), an uplink grant response and an RAR, then the base station receives a connection establishment request Msg3 returned by the terminal according to the RAR, and finally the base station returns a connection establishment request response Msg4 according to the Msg3 sent by the terminal, thereby finally completing a random access process. The present embodiment is not limited thereto.

In this embodiment, the base station reserves a mirror resource for the original resource by determining the original resource corresponding to the parameter information after initializing the system, then sends a downlink synchronization signal to the terminal through the original resource and the mirror resource, and then determines a target transmission resource according to the downlink synchronization signal transmitted by the original resource and/or the downlink synchronization signal transmitted by the mirror resource demodulated by the terminal, and finally completes the random access process performed by the target transmission resource and the terminal. The base station reserves mirror image resources for the original resource allocation according to the initialized system parameter information, and sends downlink synchronous signals to the terminal through the synchronization of the original resources and the mirror image resources, so that diversity gain of the base station and the two sides of the terminal is realized, the decoding success rate of the terminal in a random access network is enhanced, and the robustness of the random access process of the terminal in an interference environment is remarkably improved.

In one embodiment, step 302 "reserve mirror resources for original resources" in the above embodiment includes: taking the center frequency point of the current carrier of the original resource as a symmetry axis, and reserving mirror image resources for the original resource; if the original resource is positioned at the low frequency side of the symmetry axis, the mirror image resource is positioned at the high frequency side of the symmetry axis; alternatively, if the original resource is located on the high frequency side of the symmetry axis, the mirror resource is located on the low frequency side of the symmetry axis.

In this embodiment, when setting the mirror image resource corresponding to the reserved original resource, in order to enable the original resource and the mirror image resource to send the downlink synchronization signal to the terminal at the same time, the time domain position of the mirror image resource is set to be consistent with the time domain position of the original resource, and in order to enable the resource with smaller sacrifice, the frequency domain position of the mirror image resource is set to be set by taking the center frequency point of the carrier bandwidth of the original resource as a symmetry axis, so that if in the carrier bandwidth, the frequency domain position of the original resource is relatively low frequency, the frequency domain position of the mirror image resource is relatively high frequency through symmetrical setting; if the frequency domain position of the original resource is relatively high frequency in the carrier bandwidth, the frequency domain position of the mirror resource is relatively low frequency through symmetrical arrangement, which is not limited in this embodiment.

In this embodiment, the carrier bandwidth center frequency point is used as a symmetry axis to set the position of the mirror image resource, on one hand, the mirror image resource and the original resource are in the same time domain, so that the downlink synchronization signal can be sent to the terminal synchronously; on the other hand, the mirror image resources and the frequency domain positions of the original resources are in symmetrical relation, so that the minimum resource is sacrificed, and the aim of sacrificing the minimum resource and enhancing the robustness of the terminal access network is fulfilled.

In one embodiment, after the step 302 "reserve mirror resources for original resources" in the above embodiment, the method further includes:

and if the position of the mirror image resource is not in the defined position range of the global synchronization channel number (Global Synchronization Channel Number, GSCN), adjusting the frequency domain position of the mirror image resource according to a preset rule.

The global synchronization channel numbers GSCN are used for marking the channel numbers of the SSB, each GSCN corresponds to the frequency domain position of one SSB, and the GSCNs are numbered according to the frequency domain increasing sequence. In a 5G NR system, the frequency domain position of a synchronization signal block must be filled in strictly according to the definition of GSCN. Since the base station transmits the downlink synchronization signaling carrying the SSB from the mirror resource, when the mirror resource is configured, the mirror resource position corresponding to the configuration of the SSB at the same time is configured, so that the mirror resource position must be filled according to the definition of the GSCN.

In this embodiment, when the mirror resource allocation is performed, if the position of the mirror resource is not within the defined position range of the global synchronization channel number GSCN, in this case, fine adjustment of the position of the mirror resource is required. The fine tuning of the mirror image position may include adjusting the mirror image resource to a GSCN position closest to the symmetry axis in a direction close to the symmetry axis with the carrier bandwidth center frequency point, or adjusting the mirror image resource to a GSCN position closest to the symmetry axis in a direction away from the symmetry axis with the carrier bandwidth center frequency point, or adjusting the mirror image resource to a GSCN position with a multiple of the subcarrier spacing as an adjustment unit. The present embodiment is not limited thereto.

Optionally, in an embodiment, the "adjusting the frequency domain position of the mirror resource according to the preset rule" includes:

The preset mirror resource offset refers to a subcarrier interval defined in a 5G NR system, wherein the subcarrier interval is usually 60KHz, and can be used in Sub 6GHz and millimeter waves at the same time. The carrier central axis refers to the axis of the central frequency point of the carrier bandwidth where the original resource is located, and is also the symmetry axis of the central frequency point of the carrier bandwidth used when the mirror image resource is set.

In this embodiment, for example, as shown in fig. 5, if the location of the mirror resource is not within the defined location range of the GSCN, the nearest GSCN location is found in the direction close to the central axis, and the mirror resource is filled.

Specifically, when the mirror image is a high-frequency position, the calculation mode of adjusting the mirror image resource is as follows:

SSB _{mirror_start_index_adjust} ＝SSB _{mirror_start_index} -SSB _{mirror_offset} (1)

SSB _{mirror_start_index} ＝SSB _{start_index} +2*(CarrierCenter-SSB _{start_index} ) (2)

SSB _{mirror_offset} <GSCN_gap (3)

wherein SSB is _{mirrior_start_index_adjust} Representing the location of mirrored resources in the GSCN location range after adjustment, SSB _{mirrior_start_index} Representing the locations of mirrored resources that were not in the GSCN location range prior to adjustment, SSB _{mirrior_offset} Representing the subcarrier spacing of SSBs, the maximum of which does not exceed the spacing width of two GSCN. GSCN_gap represents the frequency domain interval of two GSCNs, SSB _{start_index} Representing the time-frequency position of the original resource.

in the direction away from the carrier central axis, determining a GSCN position closest to the carrier central axis to fill the mirror image resource according to the preset mirror image resource offset; and the carrier central axis takes the central frequency point of the current carrier of the original resource as symmetrical extraction.

In this embodiment, for example, as shown in fig. 6, if the location of the mirror resource is not within the defined location range of the GSCN, the nearest GSCN location is found in the direction away from the central axis, and the mirror resource is filled.

SSB _{mirror_start_index_adjust} ＝SSB _{mirror_start_index} +SSB _{mirror_offset} (1)

SSB _{mirror_offset} <GSCN_gap (3)

it should be noted that, in the adjustment manner far from the central axis provided in this embodiment, the position settings of all the mirror resources cannot exceed the frequency domain range of the carrier bandwidth.

In this embodiment, by adjusting the frequency domain position of the mirror resource, the SSB mirror resource meets the requirement of filling in the 5G NR system strictly according to the definition of GSCN. The adjusted mirror resource location is in a defined location range of the global synchronization channel number GSCN.

In the step 304 of the foregoing embodiment, the random access procedure is performed with the terminal through the target transmission resource, where the target transmission resource is an initial configuration resource demodulated by the terminal according to the downlink synchronization signal transmitted by the original resource; or the target transmission resource is the mirror image configuration resource demodulated by the terminal according to the downlink synchronous signal transmitted by the mirror image resource.

In this embodiment, for example, the terminal receives MIB and SIB1 carried in a downlink synchronization signal sent by the base station, demodulates the MIB and SIB1 on an original resource, and if demodulation on the original resource is successful, determines that the target transmission resource is the original resource; if the demodulation on the original resource fails, the MIB and the SIB1 are selected to be demodulated on the mirror resource, and if the demodulation on the mirror resource is successful, the target transmission resource is determined to be the mirror resource. The present embodiment is not limited thereto.

In this embodiment, the base station sends the downlink synchronization signal to the terminal through the original resource and the mirror resource, so that the terminal demodulates the MIB and SIB1 carried in the downlink synchronization signal in the original resource/mirror resource, and obtains the final target transmission resource, and transmits the final target transmission resource in two resource modes, thereby increasing the success rate of the terminal accessing the network.

In one embodiment, as shown in fig. 7, a random access method is provided, and the method is applied to the terminal 102 in fig. 1 for illustration, and includes the following steps:

s701, receiving a downlink synchronous signal sent by a base station through an original resource and a mirror image resource; the time domain positions of the original resource and the mirror image resource are the same, the frequency domain positions are different, and the frequency domain positions of the original resource and the mirror image resource are not overlapped.

The downlink synchronization signal refers to a downlink synchronization signal carrying SSB, MIB and SIB1 and a CORSET0 carrying RMSI, where the downlink synchronization signal is used to make the terminal use the same time-frequency position as the base station, and InitialDownlinkBWP, initalUPlinkBWP is carried in the RMSI in the CORSET 0.

In this embodiment, the terminal receiving base station sends, to the terminal, a downlink synchronization signal carrying SSB, MIB and SIB1 and a CORSET0 carrying RMSI through the original resource and the mirror resource, respectively, where the downlink synchronization signal is used to perform communication transmission in the same time frequency as the base station. The mirror image resource refers to a resource which has the same time domain position and consistent carrying content except for the frequency domain position of the original resource, and the frequency domain positions of the original resource and the mirror image resource are not overlapped, if the phenomenon of overlapping the frequency domain positions occurs, the corresponding mirror image resource cannot be configured, which is not limited in this embodiment.

S702, demodulating the downlink synchronous signal transmitted by the original resource and/or the downlink synchronous signal transmitted by the mirror image resource, and determining the target transmission resource.

The target transmission resource refers to a transmission resource determined by the terminal successfully demodulating the MIB and SIB1 in the original resource or the mirror resource.

In this embodiment, the terminal receiving base station sends the downlink synchronization signaling carrying SSB, MIB and SIB1 and the control signal resource set CORSET0 carrying RMSI to the terminal through the original resource and the mirror resource respectively, and the SSB, MIB and SIB1 are de-mediated in the original resource and/or the mirror resource. For example, if demodulation is successful in the original resource, determining the original resource as the target transmission resource; if demodulation in the original resource fails, the MIB and the SIB1 are selected to be demodulated in the mirror resource, and if demodulation in the mirror resource is successful, the mirror resource is determined to be the target transmission resource. The present embodiment is not limited thereto.

S703, performing a random access procedure with the base station through the target transmission resource.

In this embodiment, after demodulating the target transmission resource successfully determined by the MIB and SIB1 in the original resource or the mirror resource, the terminal sends a random access channel request Msg1 to the base station on the target transmission resource, where the Msg1 carries a random access preamble, receives a random access channel request response Msg2 returned by the base station according to the Msg1, where the Msg2 carries a TA, an uplink grant response, and an RAR, then after demodulating the RAR, the terminal sends a connection establishment request Msg3 to the base station, and finally receives an Msg4 carrying RRC returned by the base station, so as to complete activation of a first initial bandwidth and implement a random access procedure. The present embodiment is not limited thereto.

In the random access method provided in this embodiment, a terminal demodulates a downlink synchronization signal transmitted by an original resource and/or a downlink synchronization signal transmitted by a mirror resource by receiving the downlink synchronization signal transmitted by the base station through the original resource and the mirror resource, determines a target transmission resource, and executes a random access process with the base station through the target transmission resource. The terminal receives the downlink synchronous signal synchronously transmitted by the base station through the original resource and the mirror image resource, demodulates the downlink synchronous signal in the original resource or the mirror image resource, and realizes diversity gain on both sides of the base station and the terminal, thereby enhancing the decoding success rate of the terminal in the random access network and remarkably improving the robustness of the random access process of the terminal in the interference environment.

In one embodiment, as shown in fig. 8, step 702 "demodulates the downlink synchronization signal of the original resource transmission and/or the downlink synchronization signal of the mirror resource transmission to determine the target transmission resource" in the above embodiment, including:

s801, demodulating a downlink synchronous signal transmitted by an original resource; if the original resource demodulation is successful, step 802 is performed; if the original resource demodulation fails, step 803 is performed.

The downlink synchronization signal comprises a downlink synchronization signal carrying SSB, MIB and SIB1 and a CORST 0 carrying RMSI, after receiving the downlink synchronization signal sent by the base station through the original resource and the mirror image resource, the terminal firstly demodulates the downlink synchronization signal on the original resource, and if the demodulation is successful, the step 802 is executed; if the original resource demodulation fails, step 803 is performed.

In this embodiment, after receiving a downlink synchronization signal sent by a base station through an original resource and a mirror image resource, a terminal first selects to demodulate SSB, MIB and SIB1 carried in the downlink synchronization signal in the original resource, and executes a corresponding operation according to a demodulation result of the terminal in the original resource, which is not limited in this embodiment.

S802, determining the initial configuration resource obtained by demodulating the downlink synchronous signal transmitted by the original resource as the target transmission resource.

In this embodiment, the terminal demodulates the SSB, MIB and SIB1 carried in the downlink synchronization signal in the original resource, where the demodulation result is used to enable the terminal and the base station to be in the same time frequency, and if demodulation in the original resource is successful, the original resource is used as the target transmission resource to perform the random access network process. The present embodiment is not limited thereto.

S803, demodulating the downlink synchronous signal transmitted by the mirror image resource, and determining the mirror image configuration resource obtained by demodulating the downlink synchronous signal transmitted by the mirror image resource as a target transmission resource.

In this embodiment, if the terminal fails to demodulate the original resource, the terminal selects to demodulate the SSB, MIB and SIB1 carried in the downlink synchronization signal in the mirror resource, where the demodulation result is used to enable the terminal and the base station to be in the same time frequency, and if demodulation in the mirror resource is successful, the random access network process is performed with the mirror resource as the target transmission resource. The present embodiment is not limited thereto.

In this embodiment, the terminal demodulates the downlink synchronization signal sent by the base station on the original resource and the mirror resource, and determines the process of randomly accessing the target transmission resource to the network according to the demodulation result.

In one embodiment, after "demodulating the downlink synchronization signal of the mirror resource transmission" in step 803 in the foregoing embodiment, the method further includes:

if the demodulation of the mirror resource fails, searching the synchronization signal grid, and returning to step 702 "demodulate the downlink synchronization signal transmitted by the original resource and/or the downlink synchronization signal transmitted by the mirror resource" in the above embodiment to determine the target transmission resource.

The synchronization signal grid is located at the same time domain position as the current resource, and the transmission resource is found at the same time domain position, that is, the original resource is returned for demodulation again.

In this embodiment, after demodulating SSB, MIB and SIB1 carried in the downlink synchronization signal in the mirror resource fails, the terminal re-searches for a transmission resource in the same time domain, that is, returns to an original resource corresponding to the current mirror resource, and demodulates the downlink synchronization signal again until the downlink synchronization signal is successfully demodulated. The present embodiment is not limited thereto.

In this embodiment, after the terminal fails to demodulate the downlink synchronization signal sent by the base station on the mirror resource, the terminal searches for the corresponding original resource again to demodulate the downlink synchronization signal, and as the terminal can continuously demodulate the downlink synchronization signal through the original resource and the mirror resource, the robustness of network access of the terminal is enhanced.

For better random access methods provided by the present application, the present embodiment will be explained from the whole step flow of the random access method. As shown in fig. 9, includes:

s901, a base station determines original resources corresponding to parameter information after initializing a system;

s902, reserving mirror image resources for original resources by a base station;

s903, the base station simultaneously transmits a downlink synchronous signal to the terminal through the original resource and the mirror image resource;

s904, the terminal demodulates the downlink synchronous signal transmitted by the original resource; if demodulation is successful in the original resource, S705 is executed; if demodulation fails in the original resource, S906 is performed;

s905, the terminal side selects the original resource transmission as downlink decoding (Msg 2/Msg 4) and uplink transmission (Msg 1/Msg 3) in the subsequent random access process;

s906, a terminal demodulates a downlink synchronous signal transmitted by the mirror image resource; if demodulation in the mirror resource is successful, S707 is executed; if demodulation fails in the mirror resource, returning to execute S903;

S907, the terminal side selects mirror image resource transmission as downlink decoding (Msg 2/Msg 4) and uplink transmission (Msg 1/Msg 3) in the subsequent random access process.

In this embodiment, the base station side reserves the original resource and uses the center frequency point of the carrier bandwidth as the mirror resource of the symmetric extraction, and sends the downlink synchronization signal to the terminal side through the original resource and the mirror resource at the same time, thereby realizing the diversity gain of the base station side and the terminal side in the random access network and enhancing the decoding success rate of the random access network of the terminal side.

The random access method in the aspect of communication interaction between the base station and the terminal in the random access process provided in this embodiment is similar to the process of the random access method provided in any one of the foregoing embodiments in terms of implementation principle and technical effect, and will not be described herein again.

It should be understood that, although the steps in the flowcharts of fig. 1-9 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 1-9 may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor do the order in which the sub-steps or stages are performed necessarily occur sequentially, but may be performed alternately or alternately with at least a portion of the sub-steps or stages of other steps or steps.

In one embodiment, as shown in fig. 10, there is provided a random access apparatus 500, comprising: an initialization module 501, a configuration module 502, a sending module 503, and a transmission module 504, wherein:

an initialization module 501, configured to determine an original resource corresponding to parameter information after initializing a system; the parameter information comprises uplink air interface configuration information and downlink air interface configuration information;

a configuration module 502, configured to reserve mirror resources for original resources; the time domain positions of the original resource and the mirror image resource are the same, the frequency domain positions are different, and the frequency domain positions of the original resource and the mirror image resource are not overlapped;

a sending module 503, configured to send downlink synchronization signals to the terminal through the original resource and the mirror resource respectively; the downlink synchronous signal is used for terminal demodulation to obtain a target transmission resource;

a transmission module 504, configured to perform a random access procedure with the terminal through the target transmission resource.

In one embodiment, the configuration module 502 is configured to reserve a mirror resource for the original resource with a center frequency point of a current carrier of the original resource as a symmetry axis;

In one embodiment, as shown in fig. 11, the configuration module 502 includes an adjusting unit 5021:

the adjusting unit 5021 is configured to adjust the frequency domain position of the mirror resource according to a preset rule if the position of the mirror resource is not within the defined position range of the global synchronization channel number GSCN.

Optionally, in an embodiment, the adjusting unit 5021 is further configured to determine, in a direction approaching to the carrier central axis, a GSCN location closest to the carrier central axis according to a preset mirror resource offset to fill the mirror resource; the central axis of the carrier is symmetrically extracted by taking the central frequency point of the current carrier of the original resource.

Optionally, in an embodiment, the adjusting unit 5021 is further configured to determine, in a direction away from the carrier central axis, a GSCN location closest to the carrier central axis to fill the mirror resource according to a preset mirror resource offset; the central axis of the carrier is symmetrically extracted by taking the central frequency point of the current carrier of the original resource.

In one embodiment, the target transmission resource is an initial configuration resource which is demodulated by the terminal according to the downlink synchronization signal transmitted by the original resource; or the target transmission resource is the mirror image configuration resource demodulated by the terminal according to the downlink synchronous signal transmitted by the mirror image resource.

In one embodiment, as shown in fig. 12, there is provided a random access apparatus 600 comprising: a receiving module 601, a demodulating module 602, and a transmitting module 603, wherein:

a receiving module 601, configured to receive a downlink synchronization signal sent by a base station through an original resource and a mirror resource; the time domain positions of the original resource and the mirror image resource are the same, the frequency domain positions are different, and the frequency domain positions of the original resource and the mirror image resource are not overlapped;

the demodulation module 602 is configured to demodulate a downlink synchronization signal transmitted by an original resource and/or a downlink synchronization signal transmitted by a mirror resource, and determine a target transmission resource;

a transmission module 603, configured to perform a random access procedure with the base station through the target transmission resource.

In one embodiment, as shown in fig. 13, the demodulation module 602 includes a determination unit 6021:

a determining unit 6021 for demodulating the downlink synchronization signal of the original resource transmission; if the original resource is successfully demodulated, determining an initial configuration resource obtained by demodulating a downlink synchronous signal transmitted by the original resource as a target transmission resource; if the original resource fails to demodulate, demodulating the downlink synchronous signal transmitted by the mirror resource, and determining the mirror configuration resource obtained by demodulating the downlink synchronous signal transmitted by the mirror resource as the target transmission resource.

In one embodiment, as shown in fig. 14, on the basis of fig. 13, the demodulation module 602 further includes a search unit 6022:

and a searching unit 6022, configured to search the synchronization signal grid if the image resource demodulation fails, and return to perform the step of demodulating the downlink synchronization signal of the original resource transmission and/or the downlink synchronization signal of the image resource transmission to determine the target transmission resource.

The implementation principle and technical effects of the random access device provided in the above embodiment are similar to those of the above method embodiment, and are not described herein again.

For specific limitations of the random access apparatus, reference may be made to the above limitations of the random access method, and no further description is given here. The respective modules in the random access device described above may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.

In one embodiment, a computer device is provided, which may be a base station or a server, and the internal structure of which may be as shown in fig. 15. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer device is for storing random access data. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a random access method. \

In one embodiment, a computer device is provided, which may be a terminal, and the internal structure thereof may be as shown in fig. 16. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a random access method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.

It will be appreciated by those skilled in the art that the structures shown in fig. 15 and 16 are merely block diagrams of portions of structures associated with aspects of the present application and are not intended to limit the computer device to which aspects of the present application may be applied, and that a particular computer device may include more or less components than those shown, or may combine some of the components, or have a different arrangement of components.

In one embodiment, a computer device is provided comprising a memory and a processor, the memory having stored therein a computer program, the processor when executing the computer program performing the steps of:

The implementation principle and technical effects of the computer device provided by the embodiment of the present application are similar to those of the above method embodiment, and are not described herein.

In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:

The computer readable storage medium provided in this embodiment has similar principles and technical effects to those of the above method embodiment, and will not be described herein.

Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims

1. A random access method, the method comprising:

reserving mirror image resources for the original resources, and if the positions of the mirror image resources are not in the defined position range of the global synchronization channel number GSCN, adjusting the frequency domain positions of the mirror image resources according to a preset rule; the time domain positions of the original resource and the mirror image resource are the same, the frequency domain positions are different, and the frequency domain positions of the original resource and the mirror image resource are not overlapped;

Respectively sending downlink synchronous signals to a terminal through the original resource and the mirror image resource; the downlink synchronous signal is used for terminal demodulation to obtain a target transmission resource;

2. The method of claim 1, wherein the reserving mirrored resources for the original resources comprises:

if the original resource is located at the low frequency side of the symmetry axis, the mirror resource is located at the high frequency side of the symmetry axis; alternatively, if the original resource is located on the high frequency side of the symmetry axis, the mirrored resource is located on the low frequency side of the symmetry axis.

3. The method of claim 1, wherein said adjusting the frequency domain location of the mirrored resource according to a preset rule comprises:

in the direction close to the carrier central axis, determining a GSCN position closest to the carrier central axis according to a preset mirror image resource offset to fill the mirror image resource; and the carrier central axis takes the central frequency point of the current carrier of the original resource as symmetrical extraction.

4. The method of claim 1, wherein said adjusting the frequency domain location of the mirrored resource according to a preset rule comprises:

in the direction away from the carrier central axis, determining one GSCN position closest to the carrier central axis according to a preset mirror image resource offset to fill the mirror image resource; and the carrier central axis takes the central frequency point of the current carrier of the original resource as symmetrical extraction.

5. The method according to claim 1 or 2, wherein the target transmission resource is an initial configuration resource that the terminal demodulates according to the downlink synchronization signal transmitted by the original resource; or the target transmission resource is an image configuration resource which is demodulated by the terminal according to the downlink synchronous signal transmitted by the image resource.

6. A random access method, the method comprising:

receiving a downlink synchronous signal sent by a base station through an original resource and a mirror image resource; the time domain positions of the original resource and the mirror image resource are the same, the frequency domain positions are different, the frequency domain positions of the original resource and the mirror image resource are not overlapped, and when the position of the mirror image resource is not in the defined position range of the global synchronization channel number GSCN, the frequency domain position of the mirror image resource is obtained by adjusting according to a preset rule;

Demodulating the downlink synchronous signal transmitted by the original resource and/or the downlink synchronous signal transmitted by the mirror resource to determine a target transmission resource;

7. The method of claim 6, wherein the demodulating the downlink synchronization signal of the original resource transmission and/or the downlink synchronization signal of the mirror resource transmission to determine the target transmission resource comprises:

if the original resource is successfully demodulated, determining an initial configuration resource obtained by demodulating a downlink synchronous signal transmitted by the original resource as the target transmission resource;

8. The method of claim 7, wherein after demodulating the downlink synchronization signal of the mirror resource transmission, further comprising:

if the mirror image resource demodulation fails, searching a synchronous signal grid, and returning to the step of executing the demodulation of the downlink synchronous signal transmitted by the original resource and/or the downlink synchronous signal transmitted by the mirror image resource to determine the target transmission resource.

9. A random access device, the device comprising:

the initialization module is used for determining original resources corresponding to the parameter information after the system is initialized; the parameter information comprises uplink air interface configuration information and downlink air interface configuration information;

the configuration module is used for reserving mirror image resources for the original resources, and if the positions of the mirror image resources are not in the defined position range of the global synchronization channel number GSCN, the frequency domain positions of the mirror image resources are adjusted according to a preset rule; the time domain positions of the original resource and the mirror image resource are the same, the frequency domain positions are different, and the frequency domain positions of the original resource and the mirror image resource are not overlapped;

10. A network access device, the device comprising:

the receiving module is used for receiving downlink synchronous signals sent by the base station through the original resources and the mirror image resources; the time domain positions of the original resource and the mirror image resource are the same, the frequency domain positions are different, the frequency domain positions of the original resource and the mirror image resource are not overlapped, and when the position of the mirror image resource is not in the defined position range of the global synchronization channel number GSCN, the frequency domain position of the mirror image resource is obtained by adjusting according to a preset rule;

The demodulation module is used for demodulating the downlink synchronous signal transmitted by the original resource and/or the downlink synchronous signal transmitted by the mirror image resource to determine a target transmission resource;

11. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 8 when the computer program is executed.

12. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 8.