CN109644432B

CN109644432B - Method and apparatus for random access

Info

Publication number: CN109644432B
Application number: CN201680088677.2A
Authority: CN
Inventors: 杨宁; 唐海
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2016-12-30
Filing date: 2016-12-30
Publication date: 2021-01-12
Anticipated expiration: 2036-12-30
Also published as: WO2018120103A1; CN109644432A; TW201824930A

Abstract

The embodiment of the application provides a method and a device for random access, wherein the method comprises the following steps: the terminal equipment determines a target random access resource from at least one candidate random access resource according to the bandwidth which can be supported by the terminal equipment; and the terminal equipment adopts the target random access resource to send a random access signal to network equipment. The method and the device for random access provided by the embodiment of the application can save signaling overhead, and meanwhile, terminal equipment is shunted in different frequency domains during random access, so that user experience is improved.

Description

Method and apparatus for random access

Technical Field

The present application relates to the field of communications, and more particularly, to a method and apparatus for random access in the field of communications.

Background

In a Long Term Evolution (Long Term Evolution, abbreviated as "LTE") system, a carrier bandwidth of a cell may be 20MHz, 15MHz, 10MHz, 5MHz, or 1.4MHz, and a common type of terminal device accesses the cell, and then a working bandwidth allocated to the cell by a network device is the carrier bandwidth of the cell, that is, a system bandwidth. In a fifth generation communication system (5th-generation, abbreviated as "5G"), the carrier bandwidth of a cell may be large, e.g., hundreds of megahertz or even gigahertz. For most terminal devices, the capability of the terminal devices cannot support the full carrier bandwidth, and the working bandwidth supported by the terminal devices may be much smaller than the carrier bandwidth.

In the existing schemes, when a terminal device performs initial access, a network device allocates an initial access bandwidth to the terminal device, and after the terminal device completes the initial access, the network device reports its own capability to the network device, and the network device reconfigures a working bandwidth to the network device according to the capability of the terminal device, system load and other conditions, and subsequent service transmission related to the terminal device can be performed on the working bandwidth until the network device notifies the terminal device to change the working bandwidth. Such a method causes the terminal device to be excessively crowded in the initial access bandwidth, which is not favorable for balancing loads on different bandwidths of the system, and the network device needs to notify the terminal device of the new operating bandwidth through additional signaling, which results in high signaling overhead.

Disclosure of Invention

The method and the device for random access provided by the embodiment of the application can save signaling overhead, and meanwhile, terminal equipment is shunted in different frequency domains during random access, so that user experience is improved.

In a first aspect, a method for random access is provided, including: the terminal equipment determines a target random access resource from at least one candidate random access resource according to the bandwidth which can be supported by the terminal equipment;

and the terminal equipment adopts the target random access resource to send a random access signal to network equipment.

It should be understood that the at least one candidate random access resource corresponds to at least one bandwidth, and a specific corresponding manner may be one-to-one, or may be many-to-one, that is, one candidate random access resource corresponds to one bandwidth, or multiple candidate random access resources (i.e., a group of candidate random access resources) correspond to one bandwidth, which is not limited in this embodiment of the present application. Under the condition that a group of candidate random access resources corresponds to a bandwidth, the terminal equipment needs to determine a group of candidate random access resources first, and then selects any candidate random access resource from the group of candidate random access resources to send a random access signal.

It should also be understood that the correspondence between the at least one candidate random access resource and the at least one bandwidth may be a protocol advance appointment, or may be notified to the terminal device by the network device through system information, which is not limited in this embodiment of the present application.

According to the method for random access in the embodiment of the application, the terminal equipment selects the target random access resource from at least one candidate random access resource to send the random access signal to the network equipment according to the bandwidth which can be supported by the terminal equipment, so that the network equipment can allocate the working bandwidth which is matched with the capability of the terminal equipment to the terminal equipment according to the bandwidth corresponding to the target random access resource, the network equipment can directly adopt the working bandwidth of the terminal equipment to send the random access response to the terminal equipment, the working bandwidth of the terminal equipment is prevented from being adjusted through extra signaling after random access between the terminal equipment and the network equipment, the signaling cost can be saved, meanwhile, the terminal equipment is shunted on different frequency domains during random access, and the user experience is improved.

In a first possible implementation manner of the first aspect, at least one of the following information of each of the at least one candidate random access resource is different from each other:

time domain resources, frequency domain resources, and preamble sequences.

It should be understood that, in a case that one candidate random access resource corresponds to one bandwidth, at least one of a time domain resource, a frequency domain resource, and a preamble sequence corresponding to each candidate random access resource is different from each other, and in a case that one group of candidate random access resources corresponds to one bandwidth, at least one of a time domain resource, a frequency domain resource, and a preamble sequence corresponding to each group of candidate random access resources is different from each other, so that the terminal device and the network device may determine the corresponding bandwidth according to the candidate random access resources, or determine the corresponding candidate random access resources or the group of candidate random access resources according to the bandwidth.

With reference to the foregoing possible implementation manners of the first aspect, in a second possible implementation manner of the first aspect, the determining, by the terminal device, a target random access resource from at least one candidate random access resource according to a bandwidth that can be supported by the terminal device includes:

the terminal equipment determines the working bandwidth of the terminal equipment from at least one bandwidth corresponding to the at least one candidate random access resource according to the bandwidth which can be supported by the terminal equipment;

and the terminal equipment determines the candidate random access resource corresponding to the working bandwidth as the target random access resource.

It should be understood that, since the bandwidth that can be supported by the terminal device is not necessarily included in the at least one bandwidth, the terminal device needs to determine a new bandwidth from the at least one bandwidth according to the bandwidth that can be supported by the terminal device, where the new bandwidth is a subsequent operating bandwidth of the terminal device.

It should also be understood that the terminal device may determine the operating bandwidth of the terminal device according to the bandwidth that the terminal device can support in various ways, which is not limited in this embodiment of the application.

With reference to the foregoing possible implementation manners of the first aspect, in a third possible implementation manner of the first aspect, the determining, by the terminal device, an operating bandwidth of the terminal device from at least one bandwidth corresponding to the at least one candidate random access resource according to a bandwidth that the terminal device can support includes:

and the terminal equipment determines any bandwidth which is less than or equal to the bandwidth which can be supported by the terminal equipment in the at least one bandwidth as the working bandwidth.

With reference to the foregoing possible implementation manners of the first aspect, in a fourth possible implementation manner of the first aspect, the determining, by the terminal device, an operating bandwidth of the terminal device from at least one bandwidth corresponding to the at least one candidate random access resource according to a bandwidth that the terminal device can support includes:

the terminal device determines the maximum bandwidth which is less than or equal to the bandwidth which can be supported by the terminal device in the at least one bandwidth as the working bandwidth.

Specifically, the terminal device may directly determine, as the above operating bandwidth, a maximum bandwidth of the at least one bandwidth that is less than or equal to a bandwidth that the terminal device can support. The selection mode can ensure that the working bandwidth of the terminal equipment is maximized as far as possible, so that the capability of the terminal equipment is maximized, and the user experience is improved.

With reference to the foregoing possible implementation manners of the first aspect, in a fifth possible implementation manner of the first aspect, before the terminal device determines, according to a bandwidth that can be supported by the terminal device, an operating bandwidth of the terminal device from at least one bandwidth corresponding to the at least one candidate random access resource, the method further includes:

the terminal equipment receives indication information sent by the network equipment, wherein the indication information is used for indicating the determining mode of the working bandwidth;

the determining, by the terminal device, an operating bandwidth of the terminal device from at least one bandwidth corresponding to the at least one candidate random access resource according to a bandwidth that can be supported by the terminal device includes:

and the terminal equipment determines the working bandwidth from the at least one bandwidth according to the indication information and the bandwidth which can be supported by the terminal equipment.

Specifically, the two determining manners for determining the working bandwidth by the terminal device according to the bandwidth that can be supported by the terminal device may be agreed in advance through a protocol, or may be indicated by sending the indication information by the network device, which is not limited in this embodiment of the present application. For the latter, the network device may send indication information to the terminal device to indicate the terminal device to determine the determination method of the operating bandwidth, and the terminal device receives the indication information, determines which determination method to use according to the indication information, and determines the operating bandwidth according to the bandwidth that the terminal device can support.

Optionally, the indication information may be carried in system information sent by the network device to the terminal device.

With reference to the foregoing possible implementation manners of the first aspect, in a sixth possible implementation manner of the first aspect, after the terminal device sends a random access signal to a network device by using the target random access resource, the method further includes:

and the terminal equipment receives a random access response sent by the network equipment on the working bandwidth according to the random access signal.

Specifically, after determining the operating bandwidth of the terminal device according to the target random access resource, the network device may directly send a random access response to the terminal device over the operating bandwidth, and correspondingly, the terminal device may receive the random access response sent by the network device over the operating bandwidth.

With reference to the foregoing possible implementation manners of the first aspect, in a seventh possible implementation manner of the first aspect, the method further includes:

the terminal device receives downlink control information sent by the network device, where the downlink control information is used to schedule the random access response, and the downlink control information is transmitted on any one of the following frequency resources:

all or part of the frequency resources of the working bandwidth, frequency resources agreed by a protocol or frequency resources configured by the network equipment;

the receiving, by the terminal device, a random access response sent by the network device on the working bandwidth according to the random access signal includes:

and the terminal equipment receives the random access response according to the downlink control information.

It should be understood that, since the downlink control information is for scheduling the random access response, in general, the downlink control information may be sent before the random access response or may be sent simultaneously with the random access response, which is not limited in this embodiment of the present invention.

With reference to the foregoing possible implementation manner of the first aspect, in an eighth possible implementation manner of the first aspect, before the terminal device receives the downlink control information sent by the network device, the method further includes:

the terminal device receives first system information sent by the network device, wherein the first system information is used for indicating frequency resources for transmitting the downlink control information;

the receiving, by the terminal device, the downlink control information sent by the network device includes:

and the terminal equipment receives the downlink control information on the frequency resource indicated by the first system information.

Specifically, the network device may indicate, to the terminal device, a frequency resource for transmitting the downlink control information through a first system message, and the terminal device receives the first system information and receives the downlink control information on the frequency resource indicated by the first system information.

Optionally, under the condition that the network device does not indicate the frequency resource of the downlink control information through the first system information, the terminal device may obtain the downlink control information in a blind detection manner, which is not limited in this embodiment of the present application.

With reference to the foregoing possible implementation manners of the first aspect, in a ninth possible implementation manner of the first aspect, before the terminal device determines, according to a bandwidth that can be supported by the terminal device, a target random access resource from at least one candidate random access resource, the method further includes:

the terminal device receives second system information sent by the network device, wherein the second system information is used for indicating the corresponding relation between the at least one candidate random access resource and the at least one bandwidth;

the terminal equipment determines a target random access resource from at least one candidate random access resource according to the bandwidth which can be supported by the terminal equipment, and the method comprises the following steps:

and the terminal equipment determines the target random access resource from at least one candidate random access resource according to the second system information and the bandwidth which can be supported by the terminal equipment.

Specifically, the network device may indicate, to the terminal device, a corresponding relationship between the at least one candidate random access resource and the at least one bandwidth through second system information, and the terminal device receives the second system information and determines the target random access resource according to the second system information and a bandwidth that can be supported by the terminal device.

In a second aspect, another random access method is provided, including: the network equipment receives a random access signal sent by terminal equipment by adopting a target random access resource in at least one candidate random access resource, wherein the at least one candidate random access resource corresponds to at least one bandwidth;

and the network equipment determines the bandwidth corresponding to the target random access resource as the working bandwidth of the terminal equipment.

In a first possible implementation manner of the second aspect, at least one of the following information of each of the at least one candidate random access resource is different from each other:

time domain resources, frequency domain resources, and preamble sequences.

With reference to the foregoing possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, before the network device receives a random access signal that is sent by a terminal device by using a target random access resource in at least one candidate random access resource, the method further includes:

and the network equipment sends indication information to the terminal equipment, wherein the indication information is used for indicating the terminal equipment to determine the working bandwidth.

With reference to the foregoing possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the network device sends a random access response to the terminal device on a working bandwidth corresponding to the target random access resource according to the random access signal.

With reference to the foregoing possible implementation manners of the second aspect, in a fourth possible implementation manner of the second aspect, the method further includes:

the network device sends downlink control information to the terminal device, the downlink control information is used for scheduling the random access response, and the downlink control information is transmitted on any one of the following frequency resources:

all or part of the frequency resources of the working bandwidth, frequency resources agreed by a protocol, or frequency resources configured by the network equipment.

With reference to the foregoing possible implementation manner of the second aspect, in a fifth possible implementation manner of the second aspect, before the network device sends downlink control information to the terminal device, the method further includes:

and the network equipment sends first system information to the terminal equipment, wherein the first system information is used for indicating the frequency resource for transmitting the downlink control information.

With reference to the foregoing possible implementation manner of the second aspect, in a sixth possible implementation manner of the second aspect, before the network device receives a random access signal that is sent by a terminal device by using a target random access resource in at least one candidate random access resource, the method further includes:

and the network equipment sends second system information to the terminal equipment, wherein the second system information is used for indicating the corresponding relation between the at least one candidate random access resource and the at least one bandwidth.

In a third aspect, an apparatus for random access is provided, configured to perform the method in the first aspect or any possible implementation manner of the first aspect. In particular, the apparatus comprises means for performing the method of the first aspect described above or any possible implementation manner of the first aspect.

In a fourth aspect, an apparatus for random access is provided, configured to perform the method of the second aspect or any possible implementation manner of the second aspect. In particular, the apparatus comprises means for performing the method of the second aspect described above or any possible implementation of the second aspect.

In a fifth aspect, an apparatus for random access is provided, including: a storage unit for storing instructions and a processor for executing the instructions stored by the memory, and when the processor executes the instructions stored by the memory, the execution causes the processor to perform the first aspect or the method of any possible implementation of the first aspect.

In a sixth aspect, an apparatus for random access is provided, comprising: a storage unit for storing instructions and a processor for executing the instructions stored by the memory, and when the processor executes the instructions stored by the memory, the execution causes the processor to perform the method of the second aspect or any possible implementation manner of the second aspect.

In a seventh aspect, a system for random access is provided, the system comprising the apparatus in any possible implementation manner of the third aspect or the third aspect and the apparatus in any possible implementation manner of the fourth aspect or the fourth aspect; or

The system comprises the apparatus of any of the possible implementations of the fifth aspect or the fifth aspect described above and the apparatus of any of the possible implementations of the sixth aspect or the sixth aspect.

In an eighth aspect, there is provided a computer readable medium for storing a computer program comprising instructions for carrying out the method of the first aspect or any possible implementation manner of the first aspect.

In a ninth aspect, there is provided a computer readable medium for storing a computer program comprising instructions for performing the method of the second aspect or any possible implementation of the second aspect.

Drawings

Fig. 1 is a schematic architecture diagram of a wireless communication system to which an embodiment of the present application is applied.

Fig. 2 is a schematic flow chart of a method for random access according to an embodiment of the present application.

Fig. 3 is a schematic flow chart of another method for random access according to an embodiment of the present application.

Fig. 4 is a schematic block diagram of an apparatus for random access according to an embodiment of the present application.

Fig. 5 is a schematic block diagram of another apparatus for random access according to an embodiment of the present application.

Fig. 6 is a schematic block diagram of another apparatus for random access according to an embodiment of the present application.

Fig. 7 is a schematic block diagram of another apparatus for random access according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a Long Term Evolution (Long Term Evolution, LTE) System, a Frequency Division Duplex (FDD) System, a Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication System, a future Public Land Mobile Network (PLMN) System, or a future Mobile Network (PLMN 5) System.

Alternatively, the 5G system or network may also be referred to as a New Radio (abbreviated as "NR") system or network.

Fig. 1 illustrates a wireless communication system 100 to which an embodiment of the present application is applied. The wireless communication system 100 may include at least one network device 110. Network device 100 may be a device that communicates with a terminal device. Each network device 100 may provide communication coverage for a particular geographic area and may communicate with terminal devices (e.g., UEs) located within that coverage area. The Network device 100 may be a Base Station (BTS) in a GSM system or a CDMA system, a Base Station (NodeB, NB) in a WCDMA system, an evolved Node B (eNB or eNodeB) in an LTE system, or a wireless controller in a Cloud Radio Access Network (CRAN), or a Network device in a relay Station, an Access point, a vehicle-mounted device, a wearable device, a Network-side device in a future 5G Network, or a Network device in a future evolved PLMN, and the like.

The wireless communication system 100 also includes a plurality of terminal devices 120 located within the coverage area of the network device 110. The terminal device 120 may be mobile or stationary. The terminal Equipment 120 may refer to an access terminal, User Equipment (UE), subscriber unit, subscriber station, mobile station, remote terminal, mobile device, User terminal, wireless communication device, User agent, or User Equipment. An access terminal may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device having Wireless communication capabilities, a computing device or other processing device connected to a Wireless modem, a vehicle mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved PLMN, etc.

Fig. 1 exemplarily shows one network device and two terminal devices, and optionally, the communication system 100 may include a plurality of network devices and may include other numbers of terminal devices within the coverage of each network device, which is not limited in this embodiment of the present application.

Optionally, the wireless communication system 100 may further include other network entities such as a network controller, a mobility management entity, and the like, which is not limited thereto.

The following describes a random access procedure according to an embodiment of the present application.

The random access is a necessary process for establishing a wireless link between the terminal device and the network device, and the terminal device and the network device acquire uplink synchronization through the random access. Only after the random access procedure is completed, the network device and the terminal device may perform conventional data transmission and reception. The terminal device can implement two basic functions through a random access process:

(1) acquiring uplink synchronization with the network equipment;

(2) and applying for uplink resources.

The random access procedure may be divided into contention random access and non-contention random access. In the competitive random access process, the terminal device randomly selects the random access preamble sequence, which may cause multiple terminal devices to use the same random access preamble sequence to cause random access collision, and therefore, a subsequent random access contention resolution procedure needs to be added. In the non-competitive random access process, the network equipment allocates a unique random access leader sequence to each terminal equipment needing random access, thereby avoiding the conflict generated in the access process of different terminal equipments and rapidly completing the random access.

When the terminal equipment performs initial access, the network equipment allocates initial access bandwidth for the terminal equipment, after the terminal equipment completes the initial access, the network equipment reports the self capacity to the network equipment, the network equipment reconfigures a working bandwidth for the network equipment according to the capacity of the terminal equipment, system load and other conditions, and subsequent service transmission related to the terminal equipment can be performed on the working bandwidth until the network equipment informs the terminal equipment to change the working bandwidth. Such a method requires the network device to notify the terminal device of the new operating bandwidth through additional signaling, which results in a large signaling overhead. In addition, if a plurality of terminal devices access the network device at the same time, the terminal devices in the initial access bandwidth may be excessively congested, which is not favorable for balancing loads on different bandwidths of the system.

Fig. 2 shows a schematic flow chart of a method 200 for random access provided by an embodiment of the present application. As shown in fig. 2, the method 200 includes:

s210, the terminal equipment determines a target random access resource from at least one candidate random access resource according to the bandwidth which can be supported by the terminal equipment;

s220, the terminal equipment adopts the target random access resource to send a random access signal to network equipment.

Specifically, before the terminal device performs random access, the terminal device may determine a bandwidth that can be supported by the terminal device according to its own capability, then select a target random access resource from at least one candidate random access resource according to the bandwidth that can be supported by the terminal device, and send a random access signal to the network device using the target random access resource.

Fig. 3 shows a schematic flow chart of another method 300 for random access provided by the embodiment of the present application. As shown in fig. 3, the method 300 includes:

s310, a network device receives a random access signal sent by a terminal device by adopting a target random access resource in at least one candidate random access resource, wherein the at least one candidate random access resource corresponds to at least one bandwidth;

s320, the network device determines a bandwidth corresponding to the target random access resource as a working bandwidth of the terminal device.

Optionally, after the network device determines a bandwidth corresponding to the target random access resource as an operating bandwidth of the terminal device, the method further includes: and the network equipment sends a random access response to the terminal equipment on the working bandwidth corresponding to the target random access resource according to the random access signal.

Specifically, after the terminal device sends a random access signal to the network device by using the target random access resource, the network device receives the random access signal, determines a working bandwidth corresponding to the target random access resource as a working bandwidth of the terminal device according to the target random access resource used by the terminal device, and may also send the random access signal to the terminal device over the working bandwidth.

As an optional embodiment, at least one of the following information of each of the at least one candidate random access resource is different from each other:

time domain resources, frequency domain resources, and preamble sequences.

Specifically, each of the at least one candidate random access resource may include at least one of a time domain resource, a frequency domain resource, and a preamble sequence, and at least one of the time domain resource, the frequency domain resource, and the preamble sequence of each of the at least one candidate random access resource are different from each other.

In a possible implementation manner, a system bandwidth of a cell may be divided into a plurality of different blocks, where one Block may be one Physical Resource Block (PRB) or a plurality of PRBs. For example, the system bandwidth is divided into 6 blocks, B0, B1, B2, B3, B4, and B5, each block being 20MHz, wherein the synchronization channel is located at block 4B 3. In this case, the correspondence between the at least one candidate random access resource and the at least one bandwidth may specifically be the following six cases:

1. the first group of candidate random access resources is located at B3, and the working bandwidth supported by the terminal equipment which adopts any resource in the first group of candidate random access resources to carry out random access is B3;

2. the second group of candidate random access resources are located at B2, and the working bandwidth supported by the terminal equipment which adopts any resource in the second group of candidate random access resources for random access is B2+ B3;

3. the third group of candidate random access resources is located at B4, and the working bandwidth supported by the terminal device which performs random access by using any resource in the third group of candidate random access resources is B2+ B3+ B4;

4. the fourth group of candidate random access resources is located at B5, and the working bandwidth supported by the terminal device which performs random access by using any resource in the fourth group of candidate random access resources is B2+ B3+ B4+ B5;

5. the fifth group of candidate random access resources is located at B1, and the working bandwidth supported by the terminal device which performs random access by using any resource in the fifth group of candidate random access resources is B1+ B2+ B3+ B4+ B5;

6. the sixth group of candidate random access resources is located at B0, and the working bandwidth supported by the terminal device that performs random access by using any resource in the sixth group of candidate random access resources is B0+ B1+ B2+ B3+ B4+ B5.

It should be understood that the above implementation is only the case that the frequency domain resources of the at least one candidate random access resource are different from each other. When the frequency domain resources of at least one candidate random access resource are the same, the time domain resources and/or preamble sequences of each candidate random access resource in the at least one candidate random access resource are different from each other, as long as there is no intersection between the candidate random access resources corresponding to the six groups, which is not limited in the embodiment of the present application.

It should also be understood that, in the case that the candidate random access resources are frequency domain resources, each set of candidate random access resources must be within the working bandwidth corresponding to the set of candidate random access resources, for example, the second set of candidate random access resources must be allocated at a certain position in B2+ B3, and cannot be allocated at other positions.

As an optional embodiment, the determining, by the terminal device, a target random access resource from at least one candidate random access resource according to a bandwidth that can be supported by the terminal device includes:

Specifically, the terminal device may determine, according to a bandwidth that can be supported by the terminal device, a working bandwidth of the terminal device from at least one bandwidth, and then determine a candidate random access resource corresponding to the working bandwidth as the target random access resource.

It should be understood that, since the bandwidth that can be supported by the terminal device is not necessarily included in the at least one bandwidth, the terminal device is required to determine the operating bandwidth of the terminal device from the at least one bandwidth according to the bandwidth that can be supported by the terminal device.

It should also be understood that the terminal device may determine the operating bandwidth according to the bandwidth that the terminal device can support in various ways, which is not limited in this embodiment of the application.

As an optional embodiment, the determining, by the terminal device, an operating bandwidth of the terminal device from at least one bandwidth corresponding to the at least one candidate random access resource according to a bandwidth that can be supported by the terminal device includes:

Specifically, the terminal device may determine any one of the at least one bandwidth that is less than or equal to a bandwidth that the terminal device can support as the operating bandwidth.

For example, in the foregoing possible implementation manner, the bandwidths corresponding to the first group to the sixth group are 20MHz, 40MHz, 60MHz, 80MHz, 100MHz, and 120MHz, and if the bandwidth that the terminal device can support is W and W is greater than or equal to 40 and less than 60, the terminal device may determine 20MHz or 40MHz as the working bandwidth, that is, the terminal device may arbitrarily select one candidate random access resource from the first group of candidate random access resources corresponding to 20MHz as the target random access resource, and may also arbitrarily select one candidate random access resource from the second group of candidate random access resources corresponding to 40MHz as the target random access resource, which is not limited in this embodiment of the present application.

Specifically, the terminal device may directly determine, as the operating bandwidth, a maximum bandwidth of the at least one bandwidth that is less than or equal to a bandwidth that the terminal device can support. The selection mode can ensure that the working bandwidth of the terminal equipment is maximized as far as possible, so that the capability of the terminal equipment is maximized, and the user experience is improved.

For example, in the foregoing possible implementation manner, if the bandwidth that can be supported by the terminal device is W, and W is greater than or equal to 40 and less than 60, the terminal device may directly determine 40MHz as the operating bandwidth, that is, the terminal device may arbitrarily select one candidate random access resource from the second set of candidate random access resources corresponding to 40MHz as the target random access resource.

As an optional embodiment, before the terminal device determines the operating bandwidth of the terminal device from at least one bandwidth corresponding to the at least one candidate random access resource according to a bandwidth that can be supported by the terminal device, the method further includes:

correspondingly, before the network device receives a random access signal transmitted by a terminal device by using a target random access resource in at least one candidate random access resource, the method further includes:

the network equipment sends the indication information to the terminal equipment;

Specifically, the two determining manners for determining the working bandwidth by the terminal device according to the bandwidth that can be supported by the terminal device may be agreed in advance through a protocol, or may be indicated by sending the indication information by the network device, which is not limited in this embodiment of the present application. For the latter, the network device may send indication information to the terminal device to indicate the terminal device to determine the working bandwidth, the terminal device receives the indication information, determines what determination method to use according to the indication information, and determines the working bandwidth according to the bandwidth that the terminal device can support. Optionally, the indication information may be carried in system information sent by the network device to the terminal device.

As an optional embodiment, after the terminal device sends a random access signal to a network device by using the target random access resource, the method further includes:

As an alternative embodiment, the method further comprises:

correspondingly, the network equipment sends the downlink control information to the terminal equipment;

Specifically, since the random access response is sent on a data channel, the network device needs to send downlink control information to the terminal device through a control channel, where the downlink control information is used to schedule the random access response. The downlink control information may be transmitted on any one of all or part of the frequency resources of the operating bandwidth, the frequency resources agreed by the protocol, or the frequency resources configured by the network device, which is not limited in this embodiment of the present application.

As an optional embodiment, before the terminal device receives the downlink control information sent by the network device, the method further includes:

correspondingly, before the network device sends downlink control information to the terminal device, the method further includes:

the network equipment sends the first system information to the terminal equipment;

As an optional embodiment, before the terminal device determines the target random access resource from at least one candidate random access resource according to a bandwidth that can be supported by the terminal device, the method further includes:

the network equipment sends the second system information to the terminal equipment;

Optionally, the correspondence between the at least one candidate random access resource and the at least one bandwidth may also be agreed by a protocol, which is not limited in this embodiment of the present application.

It should be understood that the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The method for random access according to the embodiment of the present application is described in detail above with reference to fig. 1 to 3, and the apparatus for random access according to the embodiment of the present application is described in detail below with reference to fig. 4 to 7.

Fig. 4 illustrates an apparatus 400 for random access provided by an embodiment of the present application. The apparatus 400 comprises:

a determining unit 410, configured to determine a target random access resource from at least one candidate random access resource according to a bandwidth that can be supported by the apparatus;

a sending unit 420, configured to send a random access signal to a network device by using the target random access resource.

According to the device for random access in the embodiment of the application, the terminal equipment selects the target random access resource from at least one candidate random access resource to send the random access signal to the network equipment according to the bandwidth which can be supported by the terminal equipment, so that the network equipment can allocate the working bandwidth which is matched with the capability of the terminal equipment to the terminal equipment according to the bandwidth corresponding to the target random access resource, the network equipment can directly adopt the working bandwidth of the terminal equipment to send the random access response to the terminal equipment, the working bandwidth of the terminal equipment is prevented from being adjusted through extra signaling after random access between the terminal equipment and the network equipment, the signaling cost can be saved, meanwhile, the terminal equipment is shunted on different frequency domains during random access, and the user experience is improved.

Optionally, at least one of the following information of each of the at least one candidate random access resource is different from each other: time domain resources, frequency domain resources, and preamble sequences.

Optionally, the determining unit 410 is specifically configured to: determining the working bandwidth of the terminal equipment from at least one bandwidth corresponding to the at least one candidate random access resource according to the bandwidth which can be supported by the terminal equipment; and determining the candidate random access resource corresponding to the working bandwidth as the target random access resource.

Optionally, the determining unit 410 is specifically configured to: and determining any bandwidth which is less than or equal to the bandwidth which can be supported by the terminal equipment in the at least one bandwidth as the working bandwidth.

Optionally, the determining unit 410 is specifically configured to: the terminal device determines the maximum bandwidth which is less than or equal to the bandwidth which can be supported by the terminal device in the at least one bandwidth as the working bandwidth.

Optionally, the apparatus further comprises: a first receiving unit, configured to receive indication information sent by the network device before the operating bandwidth of the terminal device is determined from at least one bandwidth corresponding to the at least one candidate random access resource according to a bandwidth that can be supported by the terminal device, where the indication information is used to indicate a determination manner of the operating bandwidth; the determining unit 410 is specifically configured to: and determining the working bandwidth from the at least one bandwidth according to the indication information and the bandwidth which can be supported by the terminal equipment.

Optionally, the apparatus further comprises: a second receiving unit, configured to receive a random access response sent by the network device on the working bandwidth according to the random access signal after the random access signal is sent to the network device by using the target random access resource.

Optionally, the second receiving unit is further configured to: receiving downlink control information sent by the network device, where the downlink control information is used to schedule the random access response, and the downlink control information is transmitted on any one of the following frequency resources: all or part of the frequency resources of the working bandwidth, frequency resources agreed by a protocol or frequency resources configured by the network equipment; the second receiving unit is specifically configured to: and receiving the random access response according to the downlink control information.

Optionally, the second receiving unit is further configured to: before receiving downlink control information sent by the network device, receiving first system information sent by the network device, where the first system information is used to indicate a frequency resource for transmitting the downlink control information; the second receiving unit is specifically configured to: and receiving the downlink control information on the frequency resource indicated by the first system information.

Optionally, the apparatus further comprises: a third receiving unit, configured to receive second system information sent by the network device before the target random access resource is determined from at least one candidate random access resource according to a bandwidth that can be supported by the terminal device, where the second system information is used to indicate a correspondence between the at least one candidate random access resource and at least one bandwidth; the determining unit 410 is specifically configured to: and determining the target random access resource from at least one candidate random access resource according to the second system information and the bandwidth which can be supported by the terminal equipment.

In an optional example, it may be understood by those skilled in the art that the apparatus 400 may be specifically a terminal device in the foregoing embodiment 200, and the apparatus 400 may be configured to execute each procedure and/or step corresponding to the terminal device in the foregoing method embodiment 200, and details are not described herein again to avoid repetition.

Fig. 5 illustrates another apparatus 500 for random access provided by an embodiment of the present application. The apparatus 500 comprises:

a receiving unit 510, configured to receive a random access signal sent by a terminal device using a target random access resource in at least one candidate random access resource, where the at least one candidate random access resource corresponds to at least one bandwidth;

a determining unit 520, configured to determine a bandwidth corresponding to the target random access resource as an operating bandwidth.

Optionally, the apparatus further comprises: a first sending unit, configured to send, to the terminal device, indication information before the terminal device receives a random access signal sent by using a target random access resource in at least one candidate random access resource, where the indication information is used to indicate a determination manner of the working bandwidth.

Optionally, the apparatus further comprises: and a second sending unit, configured to send a random access response to the terminal device over a working bandwidth corresponding to the target random access resource according to the random access signal.

Optionally, the second sending unit is further configured to: sending downlink control information to the terminal device, where the downlink control information is used to schedule the random access response, and the downlink control information is transmitted on any one of the following frequency resources: all or part of the frequency resources of the operating bandwidth, frequency resources agreed by a protocol, or frequency resources configured by the device.

Optionally, the second sending unit is further configured to: and before sending the downlink control information to the terminal equipment, sending first system information to the terminal equipment, wherein the first system information is used for indicating frequency resources for transmitting the downlink control information.

Optionally, the apparatus further comprises: a third sending unit, configured to send second system information to the terminal device before the terminal device receives a random access signal sent by using a target random access resource in at least one candidate random access resource, where the second system information is used to indicate a correspondence between the at least one candidate random access resource and the at least one bandwidth.

In an optional example, it may be understood by those skilled in the art that the apparatus 500 may be embodied as the network device in the foregoing embodiment 300, and the apparatus 500 may be configured to execute each procedure and/or step corresponding to the network device in the foregoing method embodiment 300, which is not described herein again to avoid repetition.

It should be appreciated that the apparatus 400 and the apparatus 500 herein may be embodied in the form of functional units. The term "unit" herein may refer to an Application Specific Integrated Circuit (ASIC), an electronic Circuit, a processor (e.g., a shared, dedicated, or group processor) and memory that execute one or more software or firmware programs, a combinational logic Circuit, and/or other suitable components that support the described functionality.

Fig. 6 is a schematic block diagram of an apparatus 600 according to an embodiment of the present application. As shown in fig. 6, the apparatus 600 includes a processor 610 and a transceiver 620.

Wherein the processor 610 is configured to determine a target random access resource from at least one candidate random access resource according to a bandwidth that can be supported by the apparatus; the transceiver 620 is configured to transmit a random access signal to a network device using the target random access resource.

Optionally, the processor 610 is specifically configured to: determining the working bandwidth of the terminal equipment from at least one bandwidth corresponding to the at least one candidate random access resource according to the bandwidth which can be supported by the terminal equipment; and determining the candidate random access resource corresponding to the working bandwidth as the target random access resource.

Optionally, the processor 610 is specifically configured to: and determining any bandwidth which is less than or equal to the bandwidth which can be supported by the terminal equipment in the at least one bandwidth as the working bandwidth.

Optionally, the processor 610 is specifically configured to: the terminal device determines the maximum bandwidth which is less than or equal to the bandwidth which can be supported by the terminal device in the at least one bandwidth as the working bandwidth.

Optionally, the transceiver 620 is further configured to: receiving indication information sent by the network equipment before determining the working bandwidth of the terminal equipment from at least one bandwidth corresponding to the at least one candidate random access resource according to the bandwidth which can be supported by the terminal equipment, wherein the indication information is used for indicating the determination mode of the working bandwidth; the processor 610 is specifically configured to: and determining an operating bandwidth from the at least one bandwidth according to the indication information and the bandwidth which can be supported by the terminal equipment.

Optionally, the transceiver 620 is further configured to: and after the target random access resource is adopted to send a random access signal to network equipment, receiving a random access response sent by the network equipment on the working bandwidth according to the random access signal.

Optionally, the transceiver 620 is further configured to: receiving downlink control information sent by the network device, where the downlink control information is used to schedule the random access response, and the downlink control information is transmitted on any one of the following frequency resources: all or part of the frequency resources of the working bandwidth, frequency resources agreed by a protocol or frequency resources configured by the network equipment; and receiving the random access response according to the downlink control information.

Optionally, the transceiver 620 is further configured to: before receiving downlink control information sent by the network device, receiving first system information sent by the network device, where the first system information is used to indicate a frequency resource for transmitting the downlink control information; and receiving the downlink control information on the frequency resource indicated by the first system information.

Optionally, the transceiver 620 is further configured to: before determining a target random access resource from at least one candidate random access resource according to a bandwidth which can be supported by the terminal device, receiving second system information sent by the network device, wherein the second system information is used for indicating a corresponding relation between the at least one candidate random access resource and the at least one bandwidth; the processor 610 is specifically configured to: and determining the target random access resource from at least one candidate random access resource according to the second system information and the bandwidth which can be supported by the terminal equipment.

In an optional example, a person skilled in the art may understand that the apparatus 600 may be embodied as the terminal device in the foregoing embodiment 200, and the apparatus 600 may be configured to execute each procedure and/or step corresponding to the terminal device in the foregoing method embodiment 200, and is not described herein again to avoid repetition.

Optionally, the apparatus 600 may also include a memory, which may include read-only memory and random access memory, and provide instructions and data to the processor. The portion of memory may also include non-volatile random access memory. For example, the memory may also store device type information. The processor 610 may be configured to execute the instructions stored in the memory, and when the processor executes the instructions, the processor may perform the steps corresponding to the terminal device in the foregoing method embodiments.

Fig. 7 is a schematic block diagram of an apparatus 700 according to an embodiment of the present application. As shown in fig. 7, the apparatus 700 includes a processor 710 and a transceiver 720.

The processor 710 is configured to receive a random access signal sent by a terminal device using a target random access resource in at least one candidate random access resource, where the at least one candidate random access resource corresponds to at least one bandwidth; and determining the bandwidth corresponding to the target random access resource as a working bandwidth.

Optionally, the transceiver 720 is further configured to: and before receiving a random access signal sent by a target random access resource in at least one candidate random access resource, sending indication information to the terminal equipment, wherein the indication information is used for indicating a determination mode of the working bandwidth.

Optionally, the transceiver 720 is configured to, after determining the bandwidth corresponding to the target random access resource as an operating bandwidth, send a random access response to the terminal device on the operating bandwidth corresponding to the target random access resource according to the random access signal.

Optionally, the transceiver 720 is further configured to: sending downlink control information to the terminal device, where the downlink control information is used to schedule the random access response, and the downlink control information is transmitted on any one of the following frequency resources: all or part of the frequency resources of the operating bandwidth, frequency resources agreed by a protocol, or frequency resources configured by the device.

Optionally, the transceiver 720 is further configured to: and before sending the downlink control information to the terminal equipment, sending first system information to the terminal equipment, wherein the first system information is used for indicating frequency resources for transmitting the downlink control information.

Optionally, the transceiver 720 is further configured to: and before receiving a random access signal sent by the terminal device by using a target random access resource in at least one candidate random access resource, sending second system information to the terminal device, wherein the second system information is used for indicating the corresponding relation between the at least one candidate random access resource and the at least one bandwidth.

In an alternative example, it may be understood by those skilled in the art that the apparatus 700 may be embodied as the network device in the foregoing embodiment 300, and the apparatus 700 may be configured to execute each procedure and/or step corresponding to the network device in the foregoing method embodiment 300, and is not described herein again to avoid repetition.

Optionally, the apparatus 700 may also include a memory, which may include read-only memory and random access memory, and provide instructions and data to the processor. The portion of memory may also include non-volatile random access memory. For example, the memory may also store device type information. The processor 710 may be configured to execute the instructions stored in the memory, and when the processor executes the instructions, the processor may perform the steps corresponding to the network device in the above method embodiments.

It should be understood that in the embodiments of the present application, the processor may be a Central Processing Unit (CPU), and the processor may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and so on. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. 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. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor executes instructions in the memory, in combination with hardware thereof, to perform the steps of the above-described method. To avoid repetition, it is not described in detail here.

It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for random access, comprising:

the method comprises the steps that terminal equipment receives indication information sent by network equipment, wherein the indication information is used for indicating a determining mode of the working bandwidth of the terminal equipment;

the terminal equipment determines a target random access resource from at least one candidate random access resource according to the indication information and the bandwidth which can be supported by the terminal equipment; each of the at least one candidate random access resource has at least one of the following information different from each other: time domain resources, frequency domain resources;

the terminal equipment adopts the target random access resource to send a random access signal to network equipment;

and the terminal equipment receives second system information sent by the network equipment, wherein the second system information is used for indicating the corresponding relation between the at least one candidate random access resource and at least one bandwidth.

2. The method of claim 1, wherein a preamble sequence of each of the at least one candidate random access resource is different from each other.

3. The method of claim 1, wherein the determining, by the terminal device, a target random access resource from at least one candidate random access resource according to a bandwidth that can be supported by the terminal device comprises:

4. The method of claim 3, wherein the determining, by the terminal device, an operating bandwidth of the terminal device from at least one bandwidth corresponding to the at least one candidate random access resource according to the bandwidth that can be supported by the terminal device comprises:

5. The method of claim 3, wherein the determining, by the terminal device, an operating bandwidth of the terminal device from at least one bandwidth corresponding to the at least one candidate random access resource according to the bandwidth that can be supported by the terminal device comprises:

6. The method of claim 1, wherein after the terminal device transmits a random access signal to a network device using the target random access resource, the method further comprises:

7. The method of claim 6, further comprising:

8. The method according to claim 7, wherein before the terminal device receives the downlink control information sent by the network device, the method further comprises:

9. The method according to any of claims 1 to 8, wherein before the terminal device determines the target random access resource from at least one candidate random access resource according to the bandwidth that can be supported by the terminal device, the method further comprises:

10. A method for random access, comprising:

the method comprises the steps that a network device sends indication information to a terminal device, wherein the indication information is used for indicating a determining mode of the working bandwidth of the terminal device;

the network equipment receives a random access signal sent by terminal equipment by adopting a target random access resource in at least one candidate random access resource, wherein the at least one candidate random access resource corresponds to at least one bandwidth; each of the at least one candidate random access resource has at least one of the following information different from each other: time domain resources, frequency domain resources;

the network equipment determines the bandwidth corresponding to the target random access resource as the working bandwidth of the terminal equipment;

11. The method of claim 10, wherein a preamble sequence of each of the at least one candidate random access resource is different from each other.

12. The method of claim 10, wherein after the network device determines a bandwidth corresponding to the target random access resource as an operating bandwidth of the terminal device, the method further comprises:

and the network equipment sends a random access response to the terminal equipment on the working bandwidth according to the random access signal.

13. The method of claim 12, further comprising:

14. The method of claim 13, wherein before the network device sends downlink control information to the terminal device, the method further comprises:

15. An apparatus for random access, comprising:

a receiving unit, configured to receive indication information sent by a network device, where the indication information is used to indicate a determination manner of a working bandwidth of the apparatus;

a determining unit, configured to determine a target random access resource from at least one candidate random access resource according to the indication information and a bandwidth that can be supported by the apparatus;

a sending unit, configured to send a random access signal to a network device by using the target random access resource;

a third receiving unit, configured to receive second system information sent by the network device, where the second system information is used to indicate a correspondence between the at least one candidate random access resource and at least one bandwidth.

16. The apparatus of claim 15, wherein at least one of the following information for each of the at least one candidate random access resource is different from each other:

time domain resources, frequency domain resources, and preamble sequences.

17. The apparatus according to claim 15, wherein the determining unit is specifically configured to:

determining an operating bandwidth of the apparatus from at least one bandwidth corresponding to the at least one candidate random access resource according to a bandwidth that the apparatus can support;

and determining the candidate random access resource corresponding to the working bandwidth as the target random access resource.

18. The apparatus according to claim 17, wherein the determining unit is specifically configured to:

determining any bandwidth of the at least one bandwidth that is less than or equal to a bandwidth that the apparatus is capable of supporting as the operating bandwidth.

19. The apparatus according to claim 17, wherein the determining unit is specifically configured to:

the apparatus determines a maximum bandwidth of the at least one bandwidth that is less than or equal to a bandwidth that the apparatus is capable of supporting as the operating bandwidth.

20. The apparatus of claim 15, further comprising:

a second receiving unit, configured to receive a random access response sent by the network device on the working bandwidth according to the random access signal after the random access signal is sent to the network device by using the target random access resource.

21. The apparatus of claim 20, wherein the second receiving unit is further configured to:

receiving downlink control information sent by the network device, where the downlink control information is used to schedule the random access response, and the downlink control information is transmitted on any one of the following frequency resources:

the second receiving unit is specifically configured to:

and receiving the random access response according to the downlink control information.

22. The apparatus of claim 21, wherein the second receiving unit is further configured to:

before receiving downlink control information sent by the network device, receiving first system information sent by the network device, where the first system information is used to indicate a frequency resource for transmitting the downlink control information;

the second receiving unit is specifically configured to:

and receiving the downlink control information on the frequency resource indicated by the first system information.

23. The apparatus according to any of claims 15 to 22, wherein the third receiving unit is further configured to:

and determining the target random access resource from at least one candidate random access resource according to the second system information and the bandwidth which can be supported by the device.

24. An apparatus for random access, comprising:

the device comprises a first sending unit, a second sending unit and a control unit, wherein the first sending unit is used for sending indication information to terminal equipment, and the indication information is used for indicating a determination mode of the working bandwidth of the terminal equipment;

a receiving unit, configured to receive a random access signal sent by a terminal device using a target random access resource in at least one candidate random access resource, where the at least one candidate random access resource corresponds to at least one bandwidth;

a determining unit, configured to determine a bandwidth corresponding to the target random access resource as a working bandwidth of the terminal device;

a third sending unit, configured to send second system information to the terminal device, where the second system information is used to indicate a correspondence between the at least one candidate random access resource and the at least one bandwidth.

25. The apparatus of claim 24, wherein at least one of the following information for each of the at least one candidate random access resource is different from each other:

time domain resources, frequency domain resources, and preamble sequences.

26. The apparatus of claim 24, further comprising:

a second sending unit, configured to send a random access response to the terminal device over the working bandwidth according to the random access signal after determining the bandwidth corresponding to the target random access resource as the working bandwidth of the terminal device.

27. The apparatus of claim 26, wherein the second sending unit is further configured to:

sending downlink control information to the terminal device, where the downlink control information is used to schedule the random access response, and the downlink control information is transmitted on any one of the following frequency resources:

all or part of the frequency resources of the operating bandwidth, frequency resources agreed by a protocol, or frequency resources configured by the device.

28. The apparatus of claim 27, wherein the second sending unit is further configured to:

and before sending the downlink control information to the terminal equipment, sending first system information to the terminal equipment, wherein the first system information is used for indicating frequency resources for transmitting the downlink control information.