CN112383961A - Random access method and system, mobile terminal and base station - Google Patents
Random access method and system, mobile terminal and base station Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 79
- 230000004044 response Effects 0.000 claims abstract description 37
- 230000036963 noncompetitive effect Effects 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 abstract description 28
- 230000002452 interceptive effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 230000003993 interaction Effects 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004590 computer program Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 238000013468 resource allocation Methods 0.000 description 2
- 238000012790 confirmation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
- H04W68/02—Arrangements for increasing efficiency of notification or paging channel
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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 discloses a random access method and a system, a mobile terminal and a base station, wherein the random access method comprises the following steps: the base station receives the paging request and selects a leader sequence from the non-competitive leader sequences for random access; the base station sends a paging request to the mobile terminal; wherein the paging request comprises: a selected leader sequence; when the base station receives a random access request sent by the mobile terminal within a preset time; wherein the random access request comprises: and when the leader sequence is selected, the base station sends a random access response to the mobile terminal according to the selected leader sequence. The random access method of the invention simplifies the interactive process of the random access process and reduces the possibility of access failure.
Description
Technical Field
The invention relates to the field of communication, in particular to a random access method and system, a mobile terminal and a base station.
Background
A typical Circuit Switched Fallback (CSFB) service flow mainly includes a joint attachment, a location update, a calling (MO) CSFB flow, a called (MT) CSFB flow, and a detach flow.
In the MT CSFB procedure, after receiving a paging request, a mobile terminal first initiates a contention-based random access procedure, and an interaction procedure of the contention-based random access procedure is complicated, and there is a possibility of access failure, thereby resulting in call failure.
Disclosure of Invention
Therefore, embodiments of the present invention provide a random access method and system, a mobile terminal, and a base station, which can simplify an interaction process in a random access process and reduce the possibility of access failure.
A first aspect of the present invention provides a random access method, including:
the base station receives the paging request and selects a leader sequence from the non-competitive leader sequences for random access;
a base station sends a paging request to a mobile terminal; wherein the paging request comprises: a selected leader sequence;
when a base station receives a random access request sent by a mobile terminal within a preset time; wherein the random access request comprises: and when the leader sequence is selected, the base station sends a random access response to the mobile terminal according to the selected leader sequence.
In some exemplary embodiments, when the base station does not receive the random access request sent by the mobile terminal within the preset time, the method further includes:
the base station withdraws the selected preamble sequence.
In some exemplary embodiments, after the base station receives the paging request, before selecting one of the non-contended preamble sequences for random access, the method further includes: starting a timer;
the base station receives the random access request sent by the mobile terminal in the preset time, and the random access request comprises the following steps: the base station receives the random access request sent by the mobile terminal before the timer is overtime.
A second aspect of the present invention provides a random access method, including:
a mobile terminal receives a paging request sent by a base station to which a resident cell belongs; wherein the paging request comprises: a leader sequence selected by the base station from among the non-competing leader sequences for random access;
the mobile terminal acquires a selected leader sequence in the paging request and sends a random access request to the base station; wherein the random access request comprises: a selected leader sequence;
and the mobile terminal receives the random access response sent by the base station.
A third aspect of the present invention provides a base station, including:
a first receiving module, configured to receive a paging request;
a selecting module, configured to select a preamble sequence from the non-contention preamble sequences for random access;
the first sending module is used for sending a paging request to the mobile terminal; wherein the paging request comprises: a selected leader sequence; when a first receiving module receives a random access request sent by a mobile terminal within a preset time; wherein the random access request comprises: and when the leader sequence is selected, sending a random access response to the mobile terminal according to the selected leader sequence.
In some exemplary embodiments, the first sending module is further configured to:
and when the first receiving module does not receive the random access request sent by the mobile terminal within the preset time, withdrawing the selected leader sequence.
In some exemplary embodiments, further comprising:
the timing module is used for starting a timer;
the first sending module is specifically configured to:
sending a paging request to the mobile terminal; wherein the paging request comprises: a selected leader sequence; and when the first receiving module receives the random access request sent by the mobile terminal before the timer is overtime, sending a random access response to the mobile terminal.
A fourth aspect of the present invention provides a mobile terminal, comprising:
a second receiving module, configured to receive a paging request sent by a base station to which a camped cell belongs; wherein the paging request comprises: a leader sequence selected by the base station from among the non-competing leader sequences for random access;
an obtaining module, configured to obtain a selected preamble sequence in a paging request;
a second sending module, configured to send a random access request to the base station; wherein the random access request comprises: a selected leader sequence;
the second receiving module is further configured to: and receiving a random access response sent by the base station.
A fifth aspect of the present invention provides a random access system, including:
the base station is used for receiving the paging request and selecting a leader sequence from the non-competitive leader sequences for random access; sending a paging request to the mobile terminal; wherein the paging request comprises: a selected leader sequence; when a random access request sent by a mobile terminal is received within a preset time; wherein the random access request comprises: when the leader sequence is selected, sending a random access response to the mobile terminal according to the selected leader sequence;
the mobile terminal is used for receiving a paging request sent by a base station to which a resident cell belongs; wherein the paging request comprises: a leader sequence selected by the base station from among the non-competing leader sequences for random access; acquiring a selected leader sequence in the paging request, and sending a random access request to a base station; wherein the random access request comprises: a selected leader sequence; and receiving a random access response sent by the base station.
In some example embodiments, the base station is further configured to:
and when the random access request sent by the mobile terminal is not received within the preset time, withdrawing the selected preamble sequence.
The invention has the following advantages:
in the random access method of the embodiment of the invention, because the leader sequence used in the random access process is selected by the base station from the non-competitive leader sequences used for random access, when the mobile terminal receives the random access response, the mobile terminal can determine that the random access response is sent to the mobile terminal rather than to other mobile terminals, so that the random access conflict does not need to be approached by the subsequent MSG3 and MSG4, the interaction process of the random access process is simplified, and the possibility of access failure is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a flowchart of a random access method according to an embodiment of the present invention;
fig. 2 is a flowchart of a random access method according to another embodiment of the present invention;
fig. 3 is a block diagram of a base station according to another embodiment of the present invention;
fig. 4 is a block diagram of a mobile terminal according to another embodiment of the present invention;
fig. 5 is a block diagram of a random access system according to another embodiment of the present invention.
In the drawings:
301: the first receiving module 302: selection module
303: first transmitting module 304: timing module
401: the second receiving module 402: acquisition module
403: the second sending module 501: base station
502: mobile terminal
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
As used in this disclosure, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
When the term "comprises," comprising, "" includes, "and/or" made from.. are used in this disclosure, the presence of features, integers, steps, operations, elements, and/or components is specified, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Embodiments of the present disclosure may be described with reference to plan and/or cross-sectional views in light of idealized schematic illustrations of the present disclosure. Accordingly, the example illustrations can be modified in accordance with manufacturing techniques and/or tolerances.
Unless otherwise defined, all terms (including technical and scientific terms) used in this disclosure have the same meaning as commonly understood by one of ordinary skill in the art. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The current MT CSFB implementation flow roughly includes the following steps:
a Mobile Switching Center (MSC) sends a paging request to a Mobility Management Entity (MME);
the MME sends a paging request to the mobile terminal;
the mobile terminal receives a paging request sent by an MME, and sends an extended service request to the MME;
the MME sends a mobile terminal fallback cell indication to an Evolved Node B (eNB);
the eNB sends the configured fallback cell information to the mobile terminal;
the mobile terminal performs fallback cell measurement and sends a measurement result to the eNB;
the eNB determines a proper fallback cell according to the measurement result and then sends the information of the proper fallback cell to the mobile terminal;
the mobile terminal falls back to a proper cell, if the fallen cell identification is not consistent with the cell identification in the combined attachment, the mobile terminal firstly carries out location updating, and after the location updating is finished, the mobile terminal sends paging response information to the MSC to establish a call.
The whole call setup time is long and the user perception is not good. And after receiving the paging request, the mobile terminal first initiates a contention-based random access procedure, which roughly comprises the following steps:
the mobile terminal randomly selects a leader sequence for random access from the public resource pool and sends a random access request to the eNB; wherein, the random access request comprises a selected leader sequence;
when the eNB detects the preamble sequence transmitted by the mobile terminal, it transmits a random access response on a Downlink Shared Channel (DL-SCH), including: index number of detected preamble sequence, time adjustment information for uplink synchronization, initial uplink resource allocation information (for transmitting subsequent Message 3(MSG3, Message3)), and a Temporary Cell Radio Network Temporary Identifier (C-RNTI);
the mobile terminal receives a Random Access Response (RAR) message, and obtains time adjustment information for uplink synchronization and initial uplink resource allocation information.
However, at this time, the mobile terminal cannot determine that the RAR message is sent to itself, rather than to other mobile terminals, and because the preamble sequence of the mobile terminal is randomly selected from the common resource pool, there is a possibility that different mobile terminals send the same preamble sequence on the same time-frequency resource, so that they receive the same response through the same Random Access Radio Network Temporary Identifier (RA-RNTI). For this reason the mobile terminal needs to resolve such random access collisions by means of the following MSG3 and Message 4(MSG4, Message 4).
As can be seen from the above description, the interaction process of the current contention-based random access procedure is complicated, and there is a possibility of access failure, thereby causing call failure.
Fig. 1 is a flowchart of a random access method according to an embodiment of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a random access method, including:
In the embodiment of the invention, the mobile terminal does not generate access conflict when the non-competitive preamble sequence for random access is used for the random access process.
In some exemplary embodiments, the base station may select one of the non-contended preamble sequences for random access based on any one of selection strategies, for example, randomly select one of the non-contended preamble sequences for random access, or sequentially select one of the non-contended preamble sequences for random access, or preferentially select one of the non-contended preamble sequences for random access. The particular selection strategy is not intended to limit the scope of the embodiments of the present invention.
In the embodiment of the present invention, after the Mobile terminal is completed with the joint attachment process, when there is an incoming call to the Mobile terminal, a Mobile Switching Center (MSC) sends a paging request to a Mobility Management Entity (MME), and the MME sends a paging request to all base stations corresponding to a Tracking Area Identifier (TAI) list where the Mobile terminal is located.
For example, when the mobile terminal is a 4G multimode card and a CSFB technique is selected to implement a voice call, after the mobile terminal is powered on, a joint attach procedure of the mobile terminal is started first, where the joint attach procedure substantially includes:
the mobile terminal sends a joint attachment request message to the MME; wherein, the Attach Type (Attach Type) in the combined Attach request message indicates that the combined Attach is a combined global two-way Paging System (EPS, E-mail Paging System)/International Mobile Subscriber Identity (IMSI), and indicates that the Mobile terminal has a Circuit Switched (CS, Circuit Switched) fallback capability;
the MME sends a Location update request message to a corresponding Visitor Location Register (VLR); wherein the location update request message includes: new parameters such as LAI, IMSI, MME information, and location update type;
the VLR stores MME information, establishes SGs association with the MME, and sends a Location update flow to a Home Location Register (HLR) according to parameters such as a new LAI, an IMSI and a Location update type;
the VLR returns a location update confirm message to the MME.
And the MME sends a joint attachment confirmation message to the mobile terminal to complete joint attachment.
After the combined attachment process is completed, when the mobile terminal has an incoming call, the calling MSC sends a paging request to the MSC (namely, called MSC) to which the mobile terminal is attached; the called MSC sends a paging request to the MME; and the MME sends paging requests to all base stations corresponding to the TAI list where the mobile terminal is located.
In some exemplary embodiments, an extension parameter may be added to the paging request, and the selected preamble sequence may be used as the extension parameter.
It should be noted that the extended parameter refers to a parameter that is not originally added in the paging request and is newly added.
It should be noted that the extended parameter may be located in a new field in the paging request, or may be located in an original field in the multiplexed paging request.
102, when a base station receives a random access request sent by a mobile terminal within a preset time; wherein the random access request comprises: and when the leader sequence is selected, the base station sends a random access response to the mobile terminal according to the selected leader sequence.
In the embodiment of the invention, the random access response is used for indicating that the mobile terminal is granted access.
In some exemplary embodiments, when the base station does not receive the random access request sent by the mobile terminal within the preset time, the method further includes:
the base station withdraws the selected preamble sequence.
In the embodiment of the present invention, the step of the base station withdrawing the selected preamble sequence means that the selected preamble sequence is placed back into the non-contention preamble sequence for random access, and after the non-contention preamble sequence for random access is placed back, other base stations can still select the preamble sequence.
In some exemplary embodiments, after the base station receives the paging request, before selecting one of the non-contended preamble sequences for random access, the method further includes: starting a timer;
correspondingly, the step of receiving the random access request sent by the mobile terminal within the preset time by the base station comprises the following steps: the base station receives a random access request sent by the mobile terminal before the timer is overtime;
correspondingly, the step that the base station does not receive the random access request sent by the mobile terminal within the preset time includes: and the base station does not receive the random access request sent by the mobile terminal when the timer is overtime.
In the random access method of the embodiment of the invention, because the leader sequence used in the random access process is selected by the base station from the non-competitive leader sequences used for random access, when the mobile terminal receives the random access response, the mobile terminal can determine that the random access response is sent to the mobile terminal rather than to other mobile terminals, so that the random access conflict does not need to be approached by the subsequent MSG3 and MSG4, the interaction process of the random access process is simplified, and the possibility of access failure is reduced.
Fig. 2 is a flowchart of a random access method according to another embodiment of the present invention.
Referring to fig. 2, another embodiment of the present invention provides a random access method, including:
In the embodiment of the present invention, the random access response is used to indicate that the mobile terminal is granted access, that is, the mobile terminal receives the random access response sent by the base station, which indicates that the mobile terminal is successfully accessed, that is, the Radio Resource Control (RRC) connection establishment is completed.
After the RRC connection is established, the mobile terminal sends an extended service request to the MME; the MME sends a mobile terminal drop-back cell indication to the base station; the base station sends the configured information of the fallback cell to the mobile terminal; the mobile terminal performs the measurement of the fallback cell and sends the measurement result to the base station; the base station determines a proper fallback cell according to the measurement result and then sends the information of the proper fallback cell to the mobile terminal; the mobile terminal falls back to a proper cell, if the fallen cell identification is not consistent with the cell identification in the combined attachment, the mobile terminal firstly carries out location updating, and after the location updating is finished, the mobile terminal sends paging response information to the MSC to establish a call.
In the random access method of the embodiment of the invention, because the leader sequence used in the random access process is selected by the base station from the non-competitive leader sequences used for random access, when the mobile terminal receives the random access response, the mobile terminal can determine that the random access response is sent to the mobile terminal rather than to other mobile terminals, so that the random access conflict does not need to be approached by the subsequent MSG3 and MSG4, the interaction process of the random access process is simplified, and the possibility of access failure is reduced.
Fig. 3 is a block diagram of a base station according to another embodiment of the present invention.
Referring to fig. 3, another embodiment of the present invention provides a base station, including:
a first receiving module 301, configured to receive a paging request;
a selecting module 302, configured to select a preamble sequence from the non-contention preamble sequences for random access;
a first sending module 303, configured to send a paging request to the mobile terminal; wherein the paging request comprises: a selected leader sequence; when a first receiving module receives a random access request sent by a mobile terminal within a preset time; wherein the random access request comprises: and when the leader sequence is selected, sending a random access response to the mobile terminal according to the selected leader sequence.
In some exemplary embodiments, the first sending module 303 is further configured to:
when the first receiving module 301 does not receive the random access request sent by the mobile terminal within the preset time, the selected preamble sequence is received back.
In some exemplary embodiments, further comprising:
a timing module 304 for starting a timer;
the first sending module 303 is specifically configured to:
sending a paging request to the mobile terminal; wherein the paging request comprises: a selected leader sequence; when the first receiving module 301 receives a random access request sent by the mobile terminal before the timer expires, it sends a random access response to the mobile terminal.
It should be noted that the specific implementation process of the base station in the embodiment of the present invention is the same as the specific implementation process of the random access method in the foregoing embodiment, and is not described here again.
Fig. 4 is a block diagram of a mobile terminal according to another embodiment of the present invention.
Referring to fig. 4, another embodiment of the present invention provides a mobile terminal, including:
a second receiving module 401, configured to receive a paging request sent by a base station to which a camped cell belongs; wherein the paging request comprises: a leader sequence selected by the base station from among the non-competing leader sequences for random access;
an obtaining module 402, configured to obtain a selected preamble sequence in the paging request;
a second sending module 403, configured to send a random access request to a base station; wherein the random access request comprises: a selected leader sequence;
the second receiving module 401 is further configured to: and receiving a random access response sent by the base station.
It should be noted that the specific implementation process of the mobile terminal according to the embodiment of the present invention is the same as the specific implementation process of the random access method according to the foregoing embodiment, and is not described herein again.
Fig. 5 is a block diagram of a random access system according to another embodiment of the present invention.
Referring to fig. 5, another embodiment of the present invention provides a random access system, including:
a base station 501, configured to receive a paging request, and select a preamble sequence from non-contention preamble sequences for random access; sending a paging request to the mobile terminal; wherein the paging request comprises: a selected leader sequence; when a random access request sent by a mobile terminal is received within a preset time; wherein the random access request comprises: when the leader sequence is selected, sending a random access response to the mobile terminal according to the selected leader sequence;
a mobile terminal 502, configured to receive a paging request sent by a base station to which a camped cell belongs; wherein the paging request comprises: a leader sequence selected by the base station from among the non-competing leader sequences for random access; acquiring a selected leader sequence in the paging request, and sending a random access request to a base station; wherein the random access request comprises: a selected leader sequence; and receiving a random access response sent by the base station.
In some exemplary embodiments, the base station 501 is further configured to:
and when the random access request sent by the mobile terminal is not received within the preset time, withdrawing the selected preamble sequence.
In some exemplary embodiments, the base station 501 is further configured to:
starting a timer; and when a random access request sent by the mobile terminal is received before the timer is overtime, sending a random access response to the mobile terminal according to the selected leader sequence.
It should be noted that the specific implementation process of the random access system in the embodiment of the present invention is the same as the specific implementation process of the random access method in the foregoing embodiment, and is not described here again.
The steps of the above methods are divided for clarity, and the implementation may be combined into one step or split some steps, and the steps are divided into multiple steps, so long as the same logical relationship is included, which are all within the protection scope of the present patent; it is within the scope of the patent to add insignificant modifications to the algorithms or processes or to introduce insignificant design changes to the core design without changing the algorithms or processes.
Each module in the present embodiment is a logical module, and in practical applications, one logical unit may be one physical unit, may be a part of one physical unit, or may be implemented by a combination of a plurality of physical units. In addition, in order to highlight the innovative part of the present invention, elements that are not so closely related to solving the technical problems proposed by the present invention are not introduced in the present embodiment, but this does not indicate that other elements are not present in the present embodiment.
Another embodiment of the present invention also provides an electronic device, comprising one or more processors; the storage device stores one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement the random access method provided in this embodiment, and in order to avoid repeated descriptions, detailed steps of the random access method are not described herein again.
Another embodiment of the present invention further provides a computer readable medium, where a computer program is stored, and when the computer program is executed by a processor, the random access method provided in this embodiment is implemented, and in order to avoid repeated descriptions, specific steps of the random access method are not described herein again.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Those skilled in the art will appreciate that although some embodiments described herein include some features included in other embodiments instead of others, combinations of features of different embodiments are meant to be within the scope of the embodiments and form different embodiments.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A random access method, comprising:
the base station receives the paging request and selects a leader sequence from the non-competitive leader sequences for random access;
the base station sends a paging request to the mobile terminal; wherein the paging request comprises: a selected leader sequence;
when the base station receives a random access request sent by the mobile terminal within a preset time; wherein the random access request comprises: and when the leader sequence is selected, the base station sends a random access response to the mobile terminal according to the selected leader sequence.
2. The random access method according to claim 1, when the base station does not receive the random access request sent by the mobile terminal within the preset time, the method further comprising:
the base station withdraws the selected preamble sequence.
3. The random access method according to claim 1, wherein after the base station receives the paging request, before selecting one of the non-contended preamble sequences for random access, the method further comprises: starting a timer;
the base station receives the random access request sent by the mobile terminal in the preset time, and the random access request comprises the following steps: and the base station receives the random access request sent by the mobile terminal before the timer is overtime.
4. A random access method, comprising:
a mobile terminal receives a paging request sent by a base station to which a resident cell belongs; wherein the paging request comprises: a leader sequence selected by the base station from among non-competing leader sequences for random access;
the mobile terminal acquires the selected leader sequence in the paging request and sends a random access request to the base station; wherein the random access request comprises: the selected leader sequence;
and the mobile terminal receives the random access response sent by the base station.
5. A base station, comprising:
a first receiving module, configured to receive a paging request;
a selecting module, configured to select a preamble sequence from the non-contention preamble sequences for random access;
the first sending module is used for sending a paging request to the mobile terminal; wherein the paging request comprises: a selected leader sequence; when the first receiving module receives a random access request sent by the mobile terminal within a preset time; wherein the random access request comprises: and when the leader sequence is selected, sending a random access response to the mobile terminal according to the selected leader sequence.
6. The base station of claim 5, the first sending module further configured to:
and when the first receiving module does not receive the random access request sent by the mobile terminal within the preset time, withdrawing the selected preamble sequence.
7. The base station of claim 5, further comprising:
the timing module is used for starting a timer;
the first sending module is specifically configured to:
sending a paging request to the mobile terminal; wherein the paging request comprises: a selected leader sequence; and when the first receiving module receives a random access request sent by the mobile terminal before the timer is overtime, sending a random access response to the mobile terminal.
8. A mobile terminal, comprising:
a second receiving module, configured to receive a paging request sent by a base station to which a camped cell belongs; wherein the paging request comprises: a leader sequence selected by the base station from among non-competing leader sequences for random access;
an obtaining module, configured to obtain a selected preamble sequence in the paging request;
a second sending module, configured to send a random access request to the base station; wherein the random access request comprises: the selected leader sequence;
the second receiving module is further configured to: and receiving a random access response sent by the base station.
9. A random access system, comprising:
the base station is used for receiving the paging request and selecting a leader sequence from the non-competitive leader sequences for random access; sending a paging request to the mobile terminal; wherein the paging request comprises: a selected leader sequence; when a random access request sent by the mobile terminal is received within a preset time; wherein the random access request comprises: when the leader sequence is selected, sending a random access response to the mobile terminal according to the selected leader sequence;
the mobile terminal is used for receiving a paging request sent by a base station to which a resident cell belongs; wherein the paging request comprises: a leader sequence selected by the base station from among non-competing leader sequences for random access; acquiring a selected leader sequence in the paging request, and sending a random access request to the base station; wherein the random access request comprises: the selected leader sequence; and receiving a random access response sent by the base station.
10. The random access system of claim 9, the base station further to:
and when the random access request sent by the mobile terminal is not received within the preset time, withdrawing the selected preamble sequence.
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Application publication date: 20210219 |