CN108260223B - Random access control method and device - Google Patents
Random access control method and device Download PDFInfo
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- CN108260223B CN108260223B CN201611236616.4A CN201611236616A CN108260223B CN 108260223 B CN108260223 B CN 108260223B CN 201611236616 A CN201611236616 A CN 201611236616A CN 108260223 B CN108260223 B CN 108260223B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/002—Transmission of channel access control information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
Abstract
The invention provides a random access control method and a device, wherein the method comprises the following steps: acquiring a broadcast message of a service cell of a terminal; if the random access period of the PRACH carried by the broadcast message is smaller than a first time threshold value, determining a target time domain position of the random access initiated by the terminal according to the random access period, a preset random access completion time length and a terminal identification code; and initiating a random access process at the target time domain position. The embodiment of the invention determines the time of initiating the random access by different terminals through the terminal identification code and at least one time threshold value, thereby ensuring that the delay time of initiating the random access by each terminal is different as much as possible, ensuring that a large number of terminals can initiate the random access discretely, lightening the signaling impact on a system and ensuring the network stability.
Description
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a random access control method and apparatus.
Background
The process of accessing a terminal into a network in LTE (long term evolution) and NB-IoT (cellular-based narrowband internet of things) systems is a random access process, and the process of initiating random access by the terminal is random for the terminal, so that the possibility that a large number of terminals initiate random access simultaneously in a unit time exists. Particularly, for the terminal of the internet of things, in order to save power, the communication module of the terminal of the internet of things is usually powered off at ordinary times, the control unit of the terminal of the internet of things notifies the communication module to activate the access network to send data at a set clock time, and a large number of activation clocks set by the terminal of the internet of things (such as a water meter in a residential building) are often the same, which may cause a large number of concurrency possibilities of the terminal of the internet of things and cause a large impact pressure on the network.
In summary, in the existing random access scheme, a large number of terminals initiate random access at the same time, so that there is a risk of causing signaling impact, and the impact of the signaling impact on the system is also very large.
Disclosure of Invention
The invention aims to provide a random access control method and a random access control device, which solve the problem that the performance of a system is influenced by signaling impact caused by simultaneously initiating random access by a large number of terminals in the prior art.
In order to achieve the above object, an embodiment of the present invention provides a random access control method, including:
acquiring a broadcast message of a service cell of a terminal;
if the random access period of the physical random access channel PRACH carried by the broadcast message is smaller than a first time threshold value, determining a target time domain position of the random access initiated by the terminal according to the random access period, a preset random access completion time length and a terminal identification code;
and initiating a random access process at the target time domain position.
Wherein the method further comprises:
and if the random access period of the PRACH carried by the broadcast message is greater than or equal to the first time threshold value, determining a target time domain position of the random access initiated by the terminal according to the cell level random access parameter carried by the broadcast message.
The step of determining the target time domain position of the random access initiated by the terminal according to the random access period, the preset random access completion time length and the terminal identification code comprises the following steps:
determining a random access reference value according to the random access period, a preset random access completion time length and a terminal identification code;
determining a system frame number of the terminal random access according to the random access reference value and the random access period;
and acquiring a target system frame number falling in a time window corresponding to the preset random access completion time length, and determining a time domain position corresponding to the target system frame number as a target time domain position of the terminal for initiating random access.
Wherein, the step of determining the random access reference value according to the random access period, the preset random access completion time length and the terminal identification code comprises:
determining a formula from the reference value
Determining a random access reference value;
wherein, B is a random access reference value; sign is a terminal identification code; mod is a modulo operation; t is2Is a preset random access completion time; n is a random access period;
is to T2The value of/N is rounded down.
The step of determining the system frame number of the terminal random access according to the random access reference value and the random access period comprises the following steps:
determining formula n according to first system frame numberfmod(N/10)＝0，
And a second system frame number determination formula (n)f(N/10)) mod (b) 0, determining a system frame number for random access by the terminal;
wherein n isfA system frame number for a terminal random access; mod is a modulo operation; n is a random access period; b is a random access reference value.
The embodiment of the invention also provides a random access control method, which comprises the following steps:
determining the starting time of the terminal random access according to the current time of the terminal, the terminal identification code and the target time threshold value;
and initiating a random access process at the starting moment.
The step of determining the starting time of the terminal random access according to the current time of the terminal, the terminal identification code and the target time threshold value comprises the following steps:
when the terminal has a data transmission requirement, generating access control information;
and if the access control information contains the scattered access identification, determining the starting time of the random access of the terminal according to the current time of the terminal, the identification code of the terminal and the target time threshold value.
Wherein the method further comprises:
and if the access control information does not contain the scattered access identification, determining that the current moment is the starting moment of the random access of the terminal.
If the access control information further comprises a time threshold, the target time threshold is the time threshold contained in the access control information;
and if the access control information does not contain a time threshold value, the target time threshold value is a time threshold value preset by the terminal.
The step of determining the starting time of the terminal random access according to the current time of the terminal, the terminal identification code and the target time threshold value comprises the following steps:
determining the formula t-t according to the starting time0+ signmodT, determining the starting time of the terminal random access;
wherein t is the starting time of the random access of the terminal; t is t0The current time of the terminal; sign is a terminal identification code; t is a target time threshold value; mod is the modulo operation.
An embodiment of the present invention further provides a random access control apparatus, including:
the system comprises an acquisition module, a processing module and a processing module, wherein the acquisition module is used for acquiring the broadcast message of a service cell of a terminal;
a first position determination module, configured to determine, if a random access period of a physical random access channel PRACH carried by the broadcast message is smaller than a first time threshold, a target time domain position where the terminal initiates a random access according to the random access period, a preset random access completion time length, and a terminal identification code;
and the first access module is used for initiating a random access process on the target time domain position.
Wherein the apparatus further comprises:
and the second position determining module is used for determining a target time domain position of the terminal initiating random access according to the second cell level random access parameter carried by the broadcast message if the random access period of the PRACH carried by the broadcast message is greater than or equal to the first time threshold value.
Wherein the first position determination module comprises:
a reference determination unit, configured to determine a random access reference value according to the random access period, a preset random access completion time length, and a terminal identification code;
a frame number determining unit, configured to determine a system frame number of the terminal random access according to the random access reference value and the random access period;
and the first time domain determining unit is used for acquiring a target system frame number falling in a time window corresponding to the preset random access completion time length, and determining a time domain position corresponding to the target system frame number as a target time domain position of the terminal for initiating random access.
Wherein the reference determination unit includes:
a reference determination subunit for determining the formula based on the reference value
Determining a random access reference value;
wherein, B is a random access reference value; sign is a terminal identification code; mod is a modulo operation; t is2Is a preset random access completion time; n is a random access period;
is to T2The value of/N is rounded down.
Wherein the frame number determination unit includes:
a frame number determining submodule for determining the formula n according to the first system frame numberfmod (N/10) is 0, and the second system frame number determines the formula (N)f/(N/10) Mod (b) ═ 0, and determines the system frame number to which the terminal has random access;
wherein n isfA system frame number for a terminal random access; mod is a modulo operation; n is a random access period; b is a random access reference value.
An embodiment of the present invention further provides a random access control apparatus, including:
the starting determining module is used for determining the starting time of the terminal random access according to the current time of the terminal, the terminal identification code and the target time threshold value;
and the second access module is used for initiating a random access process at the starting time.
Wherein the start determining module comprises:
the generating submodule is used for generating access control information when the terminal has a data sending requirement;
and the first starting determining submodule is used for determining the starting moment of the terminal random access according to the current moment of the terminal, the terminal identification code and the target time threshold value if the access control information contains the scattered access identification.
Wherein the apparatus further comprises:
and the second starting determining submodule is used for determining the current moment as the starting moment of the random access of the terminal if the access control information does not contain the dispersed access identification.
If the access control information further comprises a time threshold, the target time threshold is the time threshold contained in the access control information;
and if the access control information does not contain a time threshold value, the target time threshold value is a time threshold value preset by the terminal.
Wherein the start determining module comprises:
a start determining unit for determining t as t according to the start time0+ signmodT, determining the starting time of the terminal random access;
wherein t is the starting time of the random access of the terminal; t is t0Is the current time of the terminalEngraving; sign is a terminal identification code; t is a target time threshold value; mod is the modulo operation.
The technical scheme of the invention at least has the following beneficial effects:
the random access control method and the random access control device of the embodiment of the invention determine the time for initiating the random access by different terminals through the terminal identification code and at least one time threshold value, thereby ensuring that the delay time for initiating the random access by each terminal is different as much as possible, ensuring that a large number of terminals can discretely initiate the random access, reducing the signaling impact on a system and ensuring the network stability.
Drawings
Fig. 1 is a flowchart illustrating steps of a random access control method according to a first embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a random access control method according to a cell level random access parameter for determining a random access location of a terminal according to a cell level random access parameter according to a first embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a system frame number of terminal discrete random access in a random access control method according to a first embodiment of the present invention;
fig. 4 is a flowchart illustrating steps of a random access control method according to a second embodiment of the present invention;
fig. 5 is a schematic structural diagram of a random access control device according to a third embodiment of the present invention;
fig. 6 is a schematic structural diagram of a random access control device according to a fourth 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.
First embodiment
As shown in fig. 1, a second embodiment of the present invention provides a random access control method, including:
and step 13, initiating a random access process at the target time domain position.
In the above embodiment of the present invention, the terminal actively determines whether to initiate random access discretely or directly according to the broadcast message of the serving cell, and determines the time domain position where the terminal initiates random access according to the broadcast message, thereby initiating the random access process at the determined time domain position.
It should be noted that, in the above embodiment of the present invention, when the terminal initiates the random access process, the terminal further needs to determine the frequency domain position of the terminal, and specifically, the terminal further needs to determine the target frequency domain position where the terminal initiates the random access according to the cell-level random access parameter carried by the broadcast message; the frequency domain position of the random access initiated by the terminal can be directly determined by the cell level random access parameters.
Further, when the random access period is smaller than the first time threshold value, the terminal needs to perform discrete random access; that is, the terminal needs to determine the target time domain position of the random access according to the step 12. When the random access period is greater than or equal to the first time threshold, the terminal does not need to perform discrete random access, and initiates random access according to the time domain position determined by the broadcast message, that is, the random access method provided by the embodiment of the present invention further includes:
and step 14, if the random access period of the PRACH carried by the broadcast message is greater than or equal to the first time threshold, determining a target time domain position where the terminal initiates random access according to a second cell level random access parameter carried by the broadcast message.
In the embodiment of the invention, the random access period of the PRACH carried by the broadcast message is defined by a service cell, if the random access period is smaller than a first time threshold value, the terminal is determined to initiate discrete random access, and at the moment, the terminal autonomously determines the time domain position of the random access according to the terminal identification code, the random access period and the preset random access completion time length, so that the delay time for each terminal to initiate the random access is different, and the discretized random access is realized; if the random access period is greater than or equal to the first time threshold value, the terminal is determined to need to initiate random access immediately, and at the moment, the terminal can determine the time domain position of the random access initiated by the terminal according to other cell level random access parameters carried by the broadcast message, so that the random access process is initiated on the time domain position and the frequency domain position informed by the cell.
Specifically, the step of determining the frequency domain position includes:
and determining the target frequency domain position of the random access initiated by the terminal according to the subcarrier offset of the PRACH and the number of the subcarriers of the PRACH carried by the broadcast message.
Specifically, the values of the Subcarrier Offset (PRACH-Subcarrier Offset) of the PRACH and the Subcarrier number (PRACH-Num Subcarriers) of the PRACH are shown in table 1:
table 1 values of subcarrier offset and number of subcarriers of PRACH
In the above embodiments of the present invention, the frequency domain position where the terminal initiates the random access is determined by two parameters of the 3GPP protocol: the subcarrier offset of the PRACH and the number of the subcarriers of the PRACH are determined.
Further, step 14 includes:
step 141, determining a target time domain position of the terminal initiating random access according to the random access period of the PRACH, the access period starting time of the PRACH, the cycle prefix length of the PRACH, and the number of times of repetition of the PRACH, which are carried by the broadcast message.
Specifically, the random access period (NPRACH Resource Periodicity) of PRACH takes on {40,80,160,240,320,640,1280,2560 }.
The access cycle start Time (NPRACH Resource Period Starting Time) of the PRACH is set to be {8,16,32,64,128,256,512,1024 }.
The value of the cyclic prefix length (PRACH CP length) of the PRACH is {66.7,266,7 }.
The Number of Repetitions of the PRACH (Number of NPRACH Repetitions) is set to {1,2,4,8,16,32,64,128 }.
In the above embodiment of the present invention, the time domain position where the terminal immediately initiates the random access is defined by four parameters of the 3GPP protocol: the random access period of the PRACH, the starting time of the access period of the PRACH, the length of the cyclic prefix of the PRACH and the number of times of repetition of the PRACH.
For example, when the subcarrier offset of the PRACH is 0, the number of subcarriers of the PRACH is 12, the random access period of the PRACH is 40, the access period start time of the PRACH is 8, the cycle prefix length of the PRACH is 66.7, and the number of repetitions of the PRACH is 2, the time-frequency domain position where the terminal initiates random access, that is, the random access position is as shown in fig. 2. Specifically, as shown in fig. 2, if the subcarrier offset of the PRACH is 0 and the number of subcarriers of the PRACH is 12, it is determined that the frequency domain position where the terminal initiates the random access is the line "0" in fig. 2; since the random access period of the PRACH is 40, each column represents 1ms, that is, "0-9" represents 10ms, and 4 "0-9" represents 40 ms; since the access cycle start time of the PRACH is 8, the access cycle start time starts from the first "8"; since the length of the PRACH preamble is 66.7 and the number of times the PRACH is repeated is 2, two consecutive 5.6ms time domain positions from the first "8" are time domain positions where the terminal randomly accesses as shown in fig. 2.
Further, step 12 in the above embodiment of the present invention includes:
and step 121, determining a random access reference value according to the random access period, the preset random access completion time length and the terminal identification code.
In the embodiment of the invention, the random access is carried out in a discrete way for the terminal, and the influence on the system performance caused by the concurrent impact on the cell is avoided. Meanwhile, in order to realize discrete access of the terminal of the Internet of things, two time thresholds are preset in the embodiment of the invention; specifically, the unit of the first time threshold is milliseconds, and the first time threshold is a starting threshold of the discrete random access; the second time threshold, that is, the preset time length for completing the random access, is in units of microseconds, that is, the terminal needs to complete the random access within the preset time length for completing the random access, and the preset time length for completing the random access is related to the service delay of the terminal, and a specific value thereof is not limited herein.
It should be noted that the first time threshold and the preset random access completion time duration may be implemented in various manners, for example, fixedly configured in the terminal, or notified to the terminal by the network through signaling (for example, the network transmits an RRC connection release message or an attach receive message to the terminal).
In particular, the formula is determined from the reference value
Determining a random access reference value;
wherein, B is a random access reference value; sign is a terminal identification code; mod is a modulo operation; t is2Is a preset random access completion time; n is a random access period;
is to T2The value of/N is rounded down.
And step 122, determining a system frame number of the terminal random access according to the random access reference value and the random access period.
Specifically, the formula n is determined according to the first system frame numberfmod (N/10) is 0, and the second system frame number determines the formula (N)f(N/10)) mod (b) 0, determining a system frame number for random access by the terminal;
wherein n isfA system frame number for a terminal random access; mod is a modulo operation; n is a random access period; b is a random access reference value.
And step 123, acquiring a target system frame number falling in a time window corresponding to the preset random access completion time length, and determining a time domain position corresponding to the target system frame number as a target time domain position of the terminal initiating random access.
The terminal identification code is an International Mobile Subscriber Identity (IMSI) of the terminal, a chip serial code of the terminal, a unique temporary identification code distributed to the terminal by a Mobile Management Entity (MME) or a unique dynamic identification code distributed to the terminal by a base station.
For example, assuming that the first time threshold T1 is 1000ms, the preset random access completion time T2 is 5s, and the random access period of the PRACH is 320ms, since the random access period of the PRACH is smaller than the first time threshold, the terminal needs to perform discrete random access;
specifically, the value B is calculated by using the IMSI of the terminal, and assuming that the IMSI of the terminal a is 460001234567890 and the IMSI of the terminal B is 460001234567811, the formula is determined according to the reference value
Calculating a B value; for terminal A, the value of B is 10, and for terminal B, the value of B is 6; further determining formula n based on the first system frame numberfmod (N/10) is 0, and the second system frame number determines the formula (N)f(N/10)) mod (b) is 0, and if the system frame number of the terminal random access is determined, the system frame number N meeting the requirement is set for the terminal afMultiples of 320, such as 320, 480, etc.; and for terminal B, the system frame number n meeting the requirementfIs a multiple of 192, such as 192, 384, etc.
As shown in fig. 3, it is assumed that the preset random access completion time T2 is 5s, and the corresponding time window is 0-500 frames; specifically, there are 15 random access periods in T2, where terminal a is set to initiate random access on system frame number 320, and terminal b initiates random access on system frame number 192, and the difference between the durations of random access initiated by terminal a and terminal b is about 1280ms, so that discretization to a certain extent is achieved.
As shown in fig. 3, the system frame number 320 of the terminal a initiating random access falls within the 12 th random access period in T2; and the system frame number 192 of the random access initiated by terminal b falls within the 5 th random access period in T2.
In summary, the random access control method provided in the first embodiment of the present invention calculates the random access reference value B according to the random access period, the random access completion time threshold, and the terminal identification code, and then determines the system frame number that the terminal meeting the condition can perform random access according to the value B and the random access period, so as to determine the random access position and perform random access; the terminal can be discretely accessed into the network within the set completion time, so that the signaling impact generated by simultaneously accessing a large number of terminals into the network is avoided, namely, the random access can be discretely initiated by the large number of terminals, the signaling impact on the system is reduced, and the network stability is ensured.
Second embodiment
As shown in fig. 4, a first embodiment of the present invention provides a random access control method, including:
and 42, initiating a random access process at the starting time.
Specifically, step 41 includes:
step 411, when the terminal has a data transmission requirement, generating an access control message;
step 412, if the access control information includes the scattered access identifier, determining a starting time of the terminal random access according to the current time of the terminal, the terminal identifier and the target time threshold.
In the above embodiment of the present invention, when the terminal has a data transmission requirement, the control unit of the terminal generates an access control message, where the access control message is used to activate the communication unit of the terminal, and the communication unit is used to transmit the random access signaling and the data. And the communication unit can not send the random access process immediately, and the communication unit needs to determine the starting time according to the access control information and the current time, so that the discretization of the random access is realized.
Further, the random access method provided by the above embodiment of the present invention further includes:
step 413, if the access control information does not include the scattered access identifier, determining that the current time is a starting time of the terminal random access.
In the embodiment of the invention, if the access control information contains the scattered access identification, the terminal needs to discretize and initiate random access; and if the access control information does not contain the scattered access identification, the terminal does not need to discretize to initiate random access, and the terminal immediately initiates a random access process.
Preferably, if the access control information further includes a time threshold, the target time threshold is a time threshold included in the access control information; and if the access control information does not contain a time threshold value, the target time threshold value is a time threshold value preset by the terminal.
Further, step 41 in the above embodiment of the present invention includes:
step 411, determining t as t according to the starting time0+ signmodT, determining the starting time of the terminal random access;
wherein t is the starting time of the random access of the terminal; t is t0The current time of the terminal; sign is a terminal identification code; t is a target time threshold value; mod is the modulo operation.
And the terminal identification code is an International Mobile Subscriber Identity (IMSI) of the terminal, a chip serial code of the terminal, a unique temporary identification code distributed to the terminal by a Mobile Management Entity (MME) or a unique dynamic identification code distributed to the terminal by a base station.
It should be noted that, in the embodiment of the present invention, the terminal identification code needs to have uniqueness, that is, one terminal identification code corresponds to one unique terminal.
In summary, in the second embodiment of the present invention, the terminal calculates the starting time of the random access initiated by the terminal according to the current time, the terminal identification code and the target time threshold, and since the terminal identification has uniqueness, discretization of the starting time of the random access initiated by the terminal can be ensured, so that a large number of terminals can discretely initiate random access, signaling impact on the system is reduced, and network stability is ensured.
Third embodiment
As shown in fig. 5, a third embodiment of the present invention further provides a random access control apparatus, including:
an obtaining module 51, configured to obtain a broadcast message of a serving cell of a terminal;
a first position determining module 52, configured to determine, if a random access period of a physical random access channel PRACH carried by the broadcast message is smaller than a first time threshold, a target time domain position where the terminal initiates a random access according to the random access period, a preset random access completion time length, and a terminal identification code;
a first access module 53, configured to initiate a random access procedure at the target time domain position.
Specifically, the apparatus in the third embodiment of the present invention further includes:
and a second position determining module, configured to determine, according to a second cell-level random access parameter carried in the broadcast message, a target time domain position at which the terminal initiates random access, if the random access period is greater than or equal to the first time threshold value.
Specifically, in the third embodiment of the present invention, the first position determining module includes:
a reference determination unit, configured to determine a random access reference value according to the random access period, a preset random access completion time length, and a terminal identification code;
a frame number determining unit, configured to determine a system frame number of the terminal random access according to the random access reference value and the random access period;
and the first time domain determining unit is used for acquiring a target system frame number falling in a time window corresponding to the preset random access completion time length, and determining a time domain position corresponding to the target system frame number as a target time domain position of the terminal for initiating random access.
Specifically, in the third embodiment of the present invention, the reference determination unit includes:
a reference determination subunit for determining the formula based on the reference value
Determining random access referencesA value;
wherein, B is a random access reference value; sign is a terminal identification code; mod is a modulo operation; t is2Is a preset random access completion time; n is a random access period;
is to T2The value of/N is rounded down.
Specifically, in the third embodiment of the present invention, the frame number determining unit includes:
a frame number determining submodule for determining the formula n according to the first system frame numberfmod (N/10) is 0, and the second system frame number determines the formula (N)f(N/10)) mod (b) 0, determining a system frame number for random access by the terminal;
wherein n isfA system frame number for a terminal random access; mod is a modulo operation; n is a random access period; b is a random access reference value.
In summary, the random access control apparatus provided in the third embodiment of the present invention calculates the random access reference value B according to the random access period, the random access completion time threshold, and the terminal identification code, and then determines the system frame number that the terminal meeting the condition can perform random access according to the value B and the random access period, so as to determine the random access position and perform random access; the terminal can be discretely accessed into the network within the set completion time, so that the signaling impact generated by simultaneously accessing a large number of terminals into the network is avoided, namely, the random access can be discretely initiated by the large number of terminals, the signaling impact on the system is reduced, and the network stability is ensured.
It should be noted that, the random access control apparatus provided in the third embodiment of the present invention is a random access control apparatus capable of executing the random access control method, and all embodiments of the random access control method are applicable to the random access control apparatus and can achieve the same or similar beneficial effects.
Fourth embodiment
As shown in fig. 6, a fourth embodiment of the present invention further provides a random access control apparatus, including:
the starting determining module 61 is used for determining the starting time of the terminal random access according to the current time of the terminal, the terminal identification code and the target time threshold value;
and a second access module 62, configured to initiate a random access procedure at the starting time.
Specifically, in a fourth embodiment of the present invention, the start determining module includes:
the generating submodule is used for generating access control information when the terminal has a data sending requirement;
and the first starting determining submodule is used for determining the starting moment of the terminal random access according to the current moment of the terminal, the terminal identification code and the target time threshold value if the access control information contains the scattered access identification.
Specifically, the apparatus in the fourth embodiment of the present invention further includes:
and the second starting determining submodule is used for determining the current moment as the starting moment of the random access of the terminal if the access control information does not contain the dispersed access identification.
Specifically, in the fourth embodiment of the present invention, if the access control information further includes a time threshold, the target time threshold is a time threshold included in the access control information;
and if the access control information does not contain a time threshold value, the target time threshold value is a time threshold value preset by the terminal.
Specifically, in a fourth embodiment of the present invention, the start determining module includes:
a start determining unit for determining t as t according to the start time0+ signmodT, determining the starting time of the terminal random access;
wherein t is the starting time of the random access of the terminal; t is t0The current time of the terminal; sign is a terminal identification code; t is a target time threshold value; mod is the modulo operation.
In summary, in the fourth embodiment of the present invention, the terminal calculates the starting time of the random access initiated by the terminal according to the current time, the terminal identification code and the target time threshold, and since the terminal identification has uniqueness, discretization of the starting time of the random access initiated by the terminal can be ensured, so that a large number of terminals can discretely initiate random access, signaling impact on the system is reduced, and network stability is ensured.
It should be noted that, the random access control apparatus provided in the fourth embodiment of the present invention is a random access control apparatus capable of executing the random access control method, and all embodiments of the random access control method are applicable to the random access control apparatus and can achieve the same or similar beneficial effects.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (16)
1. A random access control method, comprising:
acquiring a broadcast message of a service cell of a terminal;
if the random access period of the physical random access channel PRACH carried by the broadcast message is smaller than a first time threshold value, determining a target time domain position of the random access initiated by the terminal according to the random access period, a preset random access completion time length and a terminal identification code, wherein the target time domain position comprises the following steps: determining a random access reference value according to the random access period, a preset random access completion time length and a terminal identification code; determining a system frame number of the terminal random access according to the random access reference value and the random access period; acquiring a target system frame number falling in a time window corresponding to the preset random access completion time length, and determining a time domain position corresponding to the target system frame number as a target time domain position of the terminal for initiating random access;
and initiating a random access process at the target time domain position.
2. The method of claim 1, further comprising:
and if the random access period of the PRACH carried by the broadcast message is greater than or equal to the first time threshold value, determining a target time domain position of the random access initiated by the terminal according to the cell level random access parameter carried by the broadcast message.
3. The method according to claim 1, wherein the step of determining a random access reference value according to the random access period, a preset random access completion time length and a terminal identification code comprises:
determining a formula from the reference value
Determining a random access reference value;
wherein, B is a random access reference value; sign is a terminal identification code; mod is a modulo operation; t is2Is a preset random access completion time; n is a random access period;
is to T2The value of/N is rounded down.
4. The method according to claim 3, wherein the step of determining the system frame number for the terminal random access according to the random access reference value and the random access period comprises:
determining formula n according to first system frame numberfmod(N/10)＝0，
And a second system frame number determination formula (n)f(N/10)) mod (b) 0, determining a system frame number for random access by the terminal;
wherein n isfA system frame number for a terminal random access; mod is a modulo operation; n is a random access period; b is a random access reference value.
5. A random access control method, comprising:
determining the starting time of the terminal random access according to the current time of the terminal, the terminal identification code and the target time threshold value, wherein the method comprises the following steps: determining the formula t-t according to the starting time0+ sign mod T, determining the starting time of the terminal random access; t is the starting time of the terminal random access; t is t0The current time of the terminal; sign is a terminal identification code; t is a target time threshold value; mod is a modulo operation;
and initiating a random access process at the starting moment.
6. The method of claim 5, wherein the step of determining the starting time of the terminal random access according to the current time of the terminal, the terminal identification code and the target time threshold value comprises:
when the terminal has a data transmission requirement, generating access control information;
and if the access control information contains the scattered access identification, determining the starting time of the random access of the terminal according to the current time of the terminal, the identification code of the terminal and the target time threshold value.
7. The method of claim 6, further comprising:
and if the access control information does not contain the scattered access identification, determining that the current moment is the starting moment of the random access of the terminal.
8. The method of claim 6, wherein if the access control information further includes a time threshold, the target time threshold is a time threshold included in the access control information;
and if the access control information does not contain a time threshold value, the target time threshold value is a time threshold value preset by the terminal.
9. A random access control device, comprising:
the system comprises an acquisition module, a processing module and a processing module, wherein the acquisition module is used for acquiring the broadcast message of a service cell of a terminal;
a first position determination module, configured to determine, if a random access period of a physical random access channel PRACH carried by the broadcast message is smaller than a first time threshold, a target time domain position where the terminal initiates a random access according to the random access period, a preset random access completion time length, and a terminal identification code;
the first access module is used for initiating a random access process on the target time domain position;
the first position determination module includes:
a reference determination unit, configured to determine a random access reference value according to the random access period, a preset random access completion time length, and a terminal identification code;
a frame number determining unit, configured to determine a system frame number of the terminal random access according to the random access reference value and the random access period;
and the first time domain determining unit is used for acquiring a target system frame number falling in a time window corresponding to the preset random access completion time length, and determining a time domain position corresponding to the target system frame number as a target time domain position of the terminal for initiating random access.
10. The apparatus of claim 9, further comprising:
and the second position determining module is used for determining a target time domain position of the terminal initiating random access according to the second cell level random access parameter carried by the broadcast message if the random access period of the PRACH carried by the broadcast message is greater than or equal to the first time threshold value.
11. The apparatus of claim 9, wherein the reference determination unit comprises:
a reference determination subunit for determining the formula based on the reference value
Determining a random access reference value;
wherein, B is a random access reference value; sign is a terminal identification code; mod is a modulo operation; t is2Is a preset random access completion time; n is a random access period;
is to T2The value of/N is rounded down.
12. The apparatus of claim 11, wherein the frame number determination unit comprises:
a frame number determining submodule for determining the formula n according to the first system frame numberfmod (N/10) is 0, and the second system frame number determines the formula (N)f(N/10)) mod (b) 0, determining a system frame number for random access by the terminal;
wherein n isfA system frame number for a terminal random access; mod is a modulo operation; n is a random access period; b is a random access reference value.
13. A random access control device, comprising:
the starting determining module is used for determining the starting time of the terminal random access according to the current time of the terminal, the terminal identification code and the target time threshold value;
the second access module is used for initiating a random access process at the starting time;
the start determining module includes:
a start determining unit for determining t as t according to the start time0+ sign mod T, determining the starting time of the terminal random access;
wherein t is the starting time of the random access of the terminal; t is t0The current time of the terminal; sign is a terminal identification code; t is a target time threshold value; mod is the modulo operation.
14. The apparatus of claim 13, wherein the activation determination module comprises:
the generating submodule is used for generating access control information when the terminal has a data sending requirement;
and the first starting determining submodule is used for determining the starting moment of the terminal random access according to the current moment of the terminal, the terminal identification code and the target time threshold value if the access control information contains the scattered access identification.
15. The apparatus of claim 14, further comprising:
and the second starting determining submodule is used for determining the current moment as the starting moment of the random access of the terminal if the access control information does not contain the dispersed access identification.
16. The apparatus of claim 14, wherein if the access control information further comprises a time threshold, the target time threshold is a time threshold included in the access control information;
and if the access control information does not contain a time threshold value, the target time threshold value is a time threshold value preset by the terminal.
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