CN108235441B - Method and device for allocating random access resources - Google Patents
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- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
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Abstract
The invention provides a method and a device for allocating random access resources, wherein the method for allocating the random access resources comprises the following steps: acquiring the number of terminals sending switching requests to a base station in a preset time period; distributing random access resources according to the quantity; and when time-frequency multiplexing of the random access resources is needed, transmitting the offset value for the time-frequency multiplexing of the random access resources to the corresponding terminal. According to the scheme, the quantity of the terminals sending the switching requests to the base station in a preset time period (according to the number of users who request the instantaneous switching requests) is obtained, the time-frequency domain resources of random access are dynamically and intensively distributed, and time and frequency offsets are configured, so that the random access resources can be multiplexed in a time domain or a frequency domain; the time delay of switching random access is reduced, and the switching performance is improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for allocating random access resources.
Background
The existing random access resource allocation mode during switching is allocated according to three dimensions of time domain, frequency domain and code domain. The time domain is a repeating time interval, such as 20ms, 10ms, 5 ms. The frequency domain is indicated by the prach-FreqOffset (random access frequency domain offset) in the upper SIB2 (system information block 2), which is generally 6 consecutive PRBs (physical resource blocks) of a subframe, and different frequency domain positions are calculated by different cells according to cellid (cell identity), so as to reduce inter-cell interference. The code domain is divided by 64 PRACH (physical random access channel) sequences, wherein the code domain is divided into two parts of contention resolution and sub-contention resolution.
For FDD (frequency division duplex), one subframe has only one PRACH frequency domain resource, and one frame has a maximum of 10 PRACH resources. For TDD (time division duplex), due to different configurations of uplink and downlink of a subframe, regardless of PRACH format4(PRACH format 4), there are at most 3 PRACH frequency domain resources for one subframe and at most 6 PRACH frequency domain resources for one frame.
In the current network, under the high-speed rail environment, the users are instantly switched to reach 300-600 users. Random access resources in handover in existing high-speed rail scenarios are not sufficient. In the existing test, the time delay of switching the signaling plane is between 100ms and 200ms, and the time delay of switching the signaling plane in a common scene is required to be between 30ms and 50 ms.
Therefore, in the prior art, a serious congestion delay problem exists in the switching signaling plane in the high-speed rail scene.
Disclosure of Invention
The invention aims to provide a method and a device for allocating random access resources, which solve the problem of serious congestion delay of a switching signaling surface in a high-speed rail scene in the prior art.
In order to solve the above technical problem, an embodiment of the present invention provides a method for allocating random access resources, which is applied to a base station, and includes:
acquiring the number of terminals sending switching requests to a base station in a preset time period;
distributing random access resources according to the quantity;
and when time-frequency multiplexing of the random access resources is needed, transmitting the offset value for the time-frequency multiplexing of the random access resources to the corresponding terminal.
Optionally, the step of allocating the random access resources according to the number includes:
determining the number of the required random access sequences according to the number;
acquiring the number of preambles in a code domain;
and according to the number of the required random access sequences and the number of the preambles, distributing the time domain and the frequency domain to the random access resources.
Optionally, the step of allocating the time domain and the frequency domain to the random access resource according to the required number of the random access sequences and the number of the preambles includes:
determining the number of random access sequences which can be carried by one subframe;
obtaining the number of random access sequences which can be currently borne according to the number of the preambles and the number of the random access sequences which can be borne by the subframe;
if the number of the required random access sequences is larger than the number of the random access sequences which can be currently carried, determining that time-frequency multiplexing needs to be carried out on random access resources; and obtaining an offset value for time-frequency multiplexing of the random access resources according to the subframe configuration.
Optionally, the step of determining the number of random access sequences that can be carried by one subframe includes:
determining the number of random access sequences of each random access resource;
determining the number of random access resources which can be borne by one subframe;
and determining the number of the random access sequences which can be borne by one subframe according to the number of the random access resources which can be borne by one subframe and the number of the random access sequences of each random access resource.
Optionally, the step of obtaining the number of terminals sending the handover request to the base station within the preset time period includes:
reducing a first offset value for switching currently sent to a terminal to a second offset value;
and counting the number of the switching requests received by the base station in the preset time period to obtain the number of the terminals sending the switching requests to the base station in the preset time period.
The invention also provides a device for distributing the random access resource, which is applied to the base station and comprises the following components:
the acquisition module is used for acquiring the number of terminals which send switching requests to the base station within a preset time period;
the allocation module is used for allocating the random access resources according to the quantity;
and the sending module is used for sending the offset value used for the time-frequency multiplexing of the random access resource to the corresponding terminal when the time-frequency multiplexing of the random access resource is needed.
Optionally, the allocating module includes:
a determining submodule for determining the number of random access sequences required according to the number;
an obtaining submodule for obtaining the number of preambles in the code domain;
and the distribution submodule is used for distributing time domain and frequency domain to the random access resource according to the random access sequence number and the preamble number.
Optionally, the allocation submodule includes:
a determining unit, configured to determine the number of random access sequences that can be carried by one subframe;
a first processing unit, configured to obtain the number of random access sequences that can be currently carried according to the number of preambles and the number of random access sequences that can be carried by the subframe;
a second processing unit, configured to determine that time-frequency multiplexing needs to be performed on the random access resource if the number of the required random access sequences is greater than the number of the random access sequences that can be currently carried; and obtaining an offset value for time-frequency multiplexing of the random access resources according to the subframe configuration.
Optionally, the determining unit includes:
a first determining subunit, configured to determine a number of random access sequences of each random access resource;
a second determining subunit, configured to determine the number of random access resources that can be borne by one subframe;
and the third determining subunit is used for determining the number of the random access sequences which can be borne by one subframe according to the number of the random access resources which can be borne by one subframe and the number of the random access sequences of each random access resource.
Optionally, the obtaining module includes:
the first processing submodule is used for reducing a first offset value which is currently sent to the terminal and used for switching to a second offset value;
and the second processing submodule is used for counting the number of the switching requests received by the base station in the preset time period and obtaining the number of the terminals which send the switching requests to the base station in the preset time period.
The technical scheme of the invention has the following beneficial effects:
in the above scheme, the method for allocating random access resources dynamically and collectively allocates time-frequency domain resources for random access by acquiring the number of terminals sending switching requests to the base station within a preset time period (according to the number of instantaneous switching request users), and configures time and frequency offsets, so that the random access resources can be multiplexed in time domain or frequency domain; the time delay of switching random access is reduced, and the switching performance is improved.
Drawings
Fig. 1 is a flowchart illustrating a method for allocating random access resources to high-speed rail users according to a first embodiment of the present invention;
fig. 2 is a schematic view of a specific application flow of a method for allocating random access resources to high-speed rail users according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of an apparatus for allocating random access resources to high-speed rail users according to a second embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides various schemes aiming at the problem of serious congestion time delay of a switching signaling surface under a high-speed rail scene in the prior art, and the schemes are as follows:
example one
Taking a high-speed rail user as an example, as shown in fig. 1, an embodiment of the present invention provides a method for allocating random access resources to a high-speed rail user, which is applicable to a base station, and includes:
step 11: acquiring the number of terminals sending switching requests to a base station in a preset time period;
step 12: distributing random access resources according to the quantity;
step 13: and when time-frequency multiplexing of the random access resources is needed, transmitting the offset value for the time-frequency multiplexing of the random access resources to the corresponding terminal.
In this embodiment, step 12 may be to allocate the random access resources according to the number, the code domain, the frequency domain, and the time domain;
in addition, in this embodiment, it is preferable to add an offset value for time-frequency multiplexing to the RRC connection reconfiguration message and send the offset value to the corresponding terminal.
When the resource is multiplexed, 1 to 2 PRBs are generally biased; when resource allocation is carried out, the users who request firstly are ranked towards the middle, and the users who request later are ranked towards the two sides.
According to the method for allocating the random access resources to the high-speed rail users, provided by the embodiment of the invention, the time-frequency domain resources of random access are dynamically and intensively allocated and the time and frequency offset are configured by acquiring the number of terminals sending switching requests to a base station in a preset time period (according to the number of users requesting instantaneous switching), so that the random access resources can be multiplexed in a time domain or a frequency domain; the time delay of switching random access is reduced, and the switching performance is improved.
Wherein the step of allocating random access resources according to the number comprises: determining the number of the required random access sequences according to the number; acquiring the number of preambles in a code domain; and according to the number of the required random access sequences and the number of the preambles, distributing the time domain and the frequency domain to the random access resources.
Preferably, the random access resource is allocated in frequency domain and then time domain.
Specifically, the step of allocating the time domain and the frequency domain to the random access resource according to the required number of the random access sequences and the number of the preambles includes: determining the number of random access sequences which can be carried by one subframe; obtaining the number of random access sequences which can be currently borne according to the number of the preambles and the number of the random access sequences which can be borne by the subframe; if the number of the required random access sequences is larger than the number of the random access sequences which can be currently carried, determining that time-frequency multiplexing needs to be carried out on random access resources; and obtaining an offset value for time-frequency multiplexing of the random access resources according to the subframe configuration.
More specifically, the step of determining the number of random access sequences that can be carried by one subframe includes: determining the number of random access sequences of each random access resource; determining the number of random access resources which can be borne by one subframe; and determining the number of the random access sequences which can be borne by one subframe according to the number of the random access resources which can be borne by one subframe and the number of the random access sequences of each random access resource.
In order to enable the terminal to send the handover request in advance, the step of acquiring the number of terminals sending handover requests to the base station within the preset time period further includes: reducing a first offset value which is currently sent to a terminal and used for switching (a signaling surface is carried out) to a second offset value; and counting the number of the switching requests received by the base station in the preset time period to obtain the number of the terminals sending the switching requests to the base station in the preset time period.
The preset time period may be embodied as a time window.
The method for allocating random access resources to high-speed rail users according to the first embodiment of the present invention is further described below.
The existing configurations of the high-speed rail random access are PRACH configuration Index 6(PRACH configuration Index 6), Preamble format 0 (Preamble format 0), and number of RA-Preamble 24 (random access Preamble number 24/contention Preamble number 24), i.e. the time domain is 5ms repeated, and the frequency domain is not multiplexed. The access switching delay of 300-600 users is about 50-100ms, that is, there is a problem that the switching delay is long due to excessive instantaneous access users.
In view of the above technical problems, considering that the time delay is defined as the time between the sending of the reconfiguration switching command and the completion of the received reconfiguration, i.e. the time of random access, and the switching is non-contention resolution, the present invention provides a scheme to reduce the time delay of switching random access and improve the switching performance by increasing the resource capacity of random access non-contention resolution.
In addition, features in a high-speed rail scenario include: the target cell for cell handover is fixed; the high-speed rail is a private network, and the interference to a nearby public network is almost zero; large-scale users in the same cell almost simultaneously initiate switching requests.
For the three characteristics of the high-speed rail scene, the uplink interference factor in the public network can be removed firstly, that is, the high-speed rail scene can reuse the frequency. Then, since the users arrive at the same time, centralized random access resource allocation can be considered, that is, the base station allocates the random access resources uniformly, thereby avoiding the terminal from retransmitting the random access request due to too few random access resources.
To sum up, an embodiment of the present invention provides a method for allocating random access resources to high-speed rail users, as shown in fig. 2, including:
step 21: determining the number of users requesting handover;
step 22: determining a non-contention random access number;
step 23: determining available frequency domain resources;
step 24: determining required time domain resources;
step 25: and distributing random access resources, and sending the RRC connection reconfiguration message added with the offset value for time-frequency multiplexing to the corresponding terminal.
Specifically, the method comprises the following steps:
firstly, reducing the offset value/offset of switching, so that the terminal sends a switching request in advance and provides a time window for centralized allocation of resources;
then, counting the number of terminals of the switching request in the window, and determining the number N of random access sequences needed later;
then, according to the total number of the sequences, allocating according to the steps of code domain (which refers to the number of code channels occupied by random access), frequency domain and time domain:
firstly, determining the number of sequences of each PRACH resource which are not competitively resolved, and defaulting to the number of code channels (number of preambles) N which are not competitively resolvedconfree＝40；
Then, the number of PRACH resources which can be carried by one subframe, namely the number of transmission blocks (time frequency resource blocks) is determined according to the system bandwidth
Wherein MOD represents the quotient-taking operation,
representing the number of PRBs of the downlink bandwidth; 6 represents that the protocol stipulates 6 PRBs as a transmission block to carry out transmission;
according to the number of code channels and the number of transmission blocks, the number of random access sequences which can be borne by one time frequency of the current system can be obtained;
such as: a 20M (equal to 100 PRBs, 1M equal to 5 PRBs) bandwidth system, where a maximum of 40 × mod (100,6) can be accessed within 1ms to 640 users (carrying 640 random access sequence numbers), which can meet general user requirements in a high-speed railway scenario (how many users can be carried in one time frequency, how many uplink time slots need to be seen, the first 6 and the last 6 of the 100 PRBs generally carry default information, how many remaining intermediate time slots are required to be determined, and when in actual use, the remaining available time slots of each subframe are not necessarily the same and need to be obtained separately);
if N is more than 640, selecting time domain multiplexing according to the subframe configuration (when in resource allocation, a frequency domain is firstly followed by a time domain, and a code domain always exists);
such as: for 600 users, the frequency domain can sequentially carry 200 users, and then 3 time domains are needed for time domain multiplexing.
Regarding the code domain, currently, there are 64 code channels in total, the configuration of the Common RACH-Config Common element in the layer three message (RRC message) may be selected as the number of different code channels, such as n4, n8, n12, n16, n20, n24, n28, n32, n36, n40, n44, n48, n52, n56, n60, or n64, where n represents the number, i.e. the number of code channels.
It should be noted that, the implementation of this solution requires modification to the existing protocol:
the PRACH resources in the existing protocol include a Common random access configuration rach-Config Common and a random access configuration PRACH-Config within a Radio Resource Config Common (Common Radio Resource configuration information) in the SIB 2. Wherein, the rach-Config Common is a random access Common parameter, such as root sequence, etc. The PRACH-Config is provided with time-frequency resource parameters PRACH-Config Index (random access channel configuration Index) and PRACH-Freq Offset (random access channel frequency domain Offset) of random access.
In the scheme, for the place needing to be modified by the existing protocol, an offset value for time domain and frequency domain multiplexing needs to be added in a Dedicated random access configuration RACH-configured specified cell in an RRC Connection Reconfiguration message, and the offset value is used for indicating the position offset of random access resources selected by a user relative to time-frequency resources issued by SIB2, so that different user groups are ensured to be accessed in different time-frequency domain resources, the access time delay during switching is reduced, and the performance is improved.
The user group differentiation is determined according to the user reaching time, namely the number of a group of users is equal to or less than the number of sequences of random access non-competitive solution, and then the users are grouped according to time.
As can be seen from the above, in order to solve the problem of long handover delay caused by excessive instantaneous access users, an embodiment of the present invention provides a scheme, which mainly includes: according to the number of users requesting the instantaneous switching, dynamically and intensively distributing the randomly accessed time-frequency domain resources to configure time and frequency offset, so that the randomly accessed resources can be multiplexed in a time domain or a frequency domain; the problem of long switching time delay is solved.
In addition, the scheme provided by the embodiment of the invention can be realized by adopting a PRACH configuration Index (random access channel configuration Index) 18 of frequency multiplexing, so that the access switching time delay of 300-600 users can be controlled to be about 20-40ms, and the requirement of switching the signaling plane time delay is met.
In summary, the scheme provided in the embodiment of the present invention, on the premise of considering interference to other cells, in combination with the special scenario case of the high-speed rail and the special requirement of the high-speed rail, provides a scheme for centrally scheduling the random access resources based on the number of instantaneous access users, and simultaneously multiplexing all frequency domain resources or uplink time slots of the random access time slots to expand the number of instantaneous access users; the congestion delay of the switching signaling surface in the high-speed rail scene is greatly reduced from 100 plus 200ms to within 10-50ms, and the problem of serious congestion delay of the switching signaling surface in the high-speed rail scene in the prior art is solved.
Example two
Taking high-speed rail users as an example, as shown in fig. 3, a second embodiment of the present invention provides an apparatus for allocating random access resources to high-speed rail users, which is applicable to a base station, and includes:
an obtaining module 31, configured to obtain the number of terminals that send a handover request to a base station within a preset time period;
an allocating module 32, configured to allocate the random access resources according to the number;
the sending module 33 is configured to send the offset value for time-frequency multiplexing of the random access resource to the corresponding terminal when the time-frequency multiplexing of the random access resource is needed.
In this embodiment, the allocating module 32 may allocate the random access resources according to the number, the code domain, the frequency domain, and the time domain;
in addition, in this embodiment, it is preferable to add an offset value for time-frequency multiplexing to the RRC connection reconfiguration message and send the offset value to the corresponding terminal.
When the resource is multiplexed, 1 to 2 PRBs are generally biased; when resource allocation is carried out, the users who request firstly are ranked towards the middle, and the users who request later are ranked towards the two sides.
The device for allocating random access resources to high-speed rail users, provided by the second embodiment of the present invention, dynamically and intensively allocates time-frequency domain resources for random access by acquiring the number of terminals sending a handover request to a base station within a preset time period (according to the number of users requesting instantaneous handover), and configures time and frequency offsets, so that the random access resources can be multiplexed in a time domain or a frequency domain; the time delay of switching random access is reduced, and the switching performance is improved.
Wherein the allocation module comprises: a determining submodule for determining the number of random access sequences required according to the number; an obtaining submodule for obtaining the number of preambles in the code domain; and the distribution submodule is used for distributing time domain and frequency domain to the random access resource according to the random access sequence number and the preamble number.
Preferably, the random access resource is allocated in frequency domain and then time domain.
Specifically, the allocation submodule includes: a determining unit, configured to determine the number of random access sequences that can be carried by one subframe; a first processing unit, configured to obtain the number of random access sequences that can be currently carried according to the number of preambles and the number of random access sequences that can be carried by the subframe; a second processing unit, configured to determine that time-frequency multiplexing needs to be performed on the random access resource if the number of the required random access sequences is greater than the number of the random access sequences that can be currently carried; and obtaining an offset value for time-frequency multiplexing of the random access resources according to the subframe configuration.
More specifically, the determination unit includes: a first determining subunit, configured to determine a number of random access sequences of each random access resource; a second determining subunit, configured to determine the number of random access resources that can be borne by one subframe; and the third determining subunit is used for determining the number of the random access sequences which can be borne by one subframe according to the number of the random access resources which can be borne by one subframe and the number of the random access sequences of each random access resource.
In order to enable the terminal to send the handover request in advance, the obtaining module further includes: the first processing submodule is used for reducing a first offset value which is currently sent to the terminal and used for switching to a second offset value; and the second processing submodule is used for counting the number of the switching requests received by the base station in the preset time period and obtaining the number of the terminals which send the switching requests to the base station in the preset time period.
The preset time period may be embodied as a time window.
In summary, the embodiment of the present invention provides a scheme for centrally scheduling random access resources based on the number of instantaneous access users, and simultaneously multiplexing all frequency domain resources or uplink timeslots of a random access timeslot to expand the number of instantaneous access users; the congestion delay of the switching signaling surface in the high-speed rail scene is greatly reduced from 100 plus 200ms to within 10-50ms, and the problem of serious congestion delay of the switching signaling surface in the high-speed rail scene in the prior art is solved.
The implementation embodiments of the method for allocating random access resources to high-speed rail users are all applicable to the embodiment of the apparatus for allocating random access resources to high-speed rail users, and can achieve the same technical effect.
It should be noted that many of the functional components described in this specification are referred to as modules/sub-modules/units/sub-units in order to more particularly emphasize their implementation independence.
In embodiments of the present invention, the modules/sub-modules/units/sub-units may be implemented in software for execution by various types of processors. An identified module of executable code may, for instance, comprise one or more physical or logical blocks of computer instructions which may, for instance, be constructed as an object, procedure, or function. Nevertheless, the executables of an identified module need not be physically located together, but may comprise disparate instructions stored in different bits which, when joined logically together, comprise the module and achieve the stated purpose for the module.
Indeed, a module of executable code may be a single instruction, or many instructions, and may even be distributed over several different code segments, among different programs, and across several memory devices. Likewise, operational data may be identified within the modules and may be embodied in any suitable form and organized within any suitable type of data structure. The operational data may be collected as a single data set, or may be distributed over different locations including over different storage devices, and may exist, at least partially, merely as electronic signals on a system or network.
When a module can be implemented by software, considering the level of existing hardware technology, a module implemented by software may build a corresponding hardware circuit to implement a corresponding function, without considering cost, and the hardware circuit may include a conventional Very Large Scale Integration (VLSI) circuit or a gate array and an existing semiconductor such as a logic chip, a transistor, or other discrete components. A module may also be implemented in programmable hardware devices such as field programmable gate arrays, programmable array logic, programmable logic devices or the like.
While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (8)
1. A method for allocating random access resources is applied to a base station, and is characterized by comprising the following steps:
acquiring the number of terminals sending switching requests to a base station in a preset time period;
the allocation of the random access resources according to the number comprises the following steps: determining the number of the required random access sequences according to the number; acquiring the number of preambles in a code domain; according to the number of the required random access sequences and the number of the preambles, distributing the time domain and the frequency domain to the random access resources;
and when time-frequency multiplexing of the random access resources is needed, transmitting the offset value for the time-frequency multiplexing of the random access resources to the corresponding terminal.
2. The method of claim 1, wherein the step of allocating random access resources in time domain and frequency domain according to the required number of random access sequences and the number of preambles comprises:
determining the number of random access sequences which can be carried by one subframe;
obtaining the number of random access sequences which can be currently borne according to the number of the preambles and the number of the random access sequences which can be borne by the subframe;
if the number of the required random access sequences is larger than the number of the random access sequences which can be currently carried, determining that time-frequency multiplexing needs to be carried out on random access resources; and obtaining an offset value for time-frequency multiplexing of the random access resources according to the subframe configuration.
3. The method according to claim 2, wherein the step of determining the number of random access sequences that can be carried by one subframe comprises:
determining the number of random access sequences of each random access resource;
determining the number of random access resources which can be borne by one subframe;
and determining the number of the random access sequences which can be borne by one subframe according to the number of the random access resources which can be borne by one subframe and the number of the random access sequences of each random access resource.
4. The method according to claim 1, wherein the step of obtaining the number of terminals sending handover requests to the base station within a preset time period comprises:
reducing a first offset value for switching currently sent to a terminal to a second offset value;
and counting the number of the switching requests received by the base station in the preset time period to obtain the number of the terminals sending the switching requests to the base station in the preset time period.
5. An apparatus for allocating random access resources, applied to a base station, includes:
the acquisition module is used for acquiring the number of terminals which send switching requests to the base station within a preset time period;
the allocation module is used for allocating the random access resources according to the quantity;
the sending module is used for sending the offset value used for the time-frequency multiplexing of the random access resource to the corresponding terminal when the time-frequency multiplexing of the random access resource is needed;
the distribution module includes:
a determining submodule for determining the number of random access sequences required according to the number;
an obtaining submodule for obtaining the number of preambles in the code domain;
and the distribution submodule is used for distributing time domain and frequency domain to the random access resource according to the random access sequence number and the preamble number.
6. The apparatus of claim 5, wherein the assignment sub-module comprises:
a determining unit, configured to determine the number of random access sequences that can be carried by one subframe;
a first processing unit, configured to obtain the number of random access sequences that can be currently carried according to the number of preambles and the number of random access sequences that can be carried by the subframe;
a second processing unit, configured to determine that time-frequency multiplexing needs to be performed on the random access resource if the number of the required random access sequences is greater than the number of the random access sequences that can be currently carried; and obtaining an offset value for time-frequency multiplexing of the random access resources according to the subframe configuration.
7. The apparatus of claim 6, wherein the determining unit comprises:
a first determining subunit, configured to determine a number of random access sequences of each random access resource;
a second determining subunit, configured to determine the number of random access resources that can be borne by one subframe;
and the third determining subunit is used for determining the number of the random access sequences which can be borne by one subframe according to the number of the random access resources which can be borne by one subframe and the number of the random access sequences of each random access resource.
8. The apparatus of claim 5, wherein the obtaining module comprises:
the first processing submodule is used for reducing a first offset value which is currently sent to the terminal and used for switching to a second offset value;
and the second processing submodule is used for counting the number of the switching requests received by the base station in the preset time period and obtaining the number of the terminals which send the switching requests to the base station in the preset time period.
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