CN103037530B - A kind of accidental access method and system - Google Patents
A kind of accidental access method and system Download PDFInfo
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- CN103037530B CN103037530B CN201110293689.8A CN201110293689A CN103037530B CN 103037530 B CN103037530 B CN 103037530B CN 201110293689 A CN201110293689 A CN 201110293689A CN 103037530 B CN103037530 B CN 103037530B
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Abstract
The invention discloses a kind of accidental access method and system, the method includes：Disturbed user terminal performs Stochastic accessing using the disturbed available random access guiding resource of user terminal；General subscriber terminal performs Stochastic accessing using the available random access guiding resource of the general subscriber terminal；Wherein, it is disturbed the subset that the available random access guiding resource of user terminal is the available random access guiding resource of general subscriber terminal.It is that disturbed user terminal sets scope of resource and this scope of resource belongs to and be not equal to the scope of resource set for general subscriber terminal in this programme; can solve because the mode that the random access resource of disturbed user terminal and general subscriber terminal is reserved respectively bring collision probability increase the problem of; so that base station can send the accidental access response of disturbed user terminal in shielded subframe, so as to reduce access delay and probability of failure.
Description
Technical field
The present invention relates to wireless communication technology field, more particularly, to a kind of accidental access method and system.
Background technology
In radio honeycomb communication system, base station is to provide nothing for user equipment (User Equipment, be abbreviated as UE)
The equipment of line access, a base station potentially includes one or more serving cells.Cell can carry for the UE of certain geographic range
For communication service, different cells may have different coverages, coverage that generally can be according to cell and deployment
Purpose divide the cell into macrocell (macro cell or eNB), Microcell (pico cell), picocell (femto
Cell or HeNB) and remote radio-frequency heads (Remote Radio Head, RRH) cell, relay station cell, repeater
(repeater) cell, correspondingly can be described as macro base station, micro-base station, Home eNodeB (micro, slight base again there is provided the base station of these cells
Stand), RRH, relay station, repeater.Cell can also have different access modules (access mode)：Usual one common
Cell can provide access service for any user, and this cell is referred to as opening cell；And in the application such as family or enterprise
Need to limit the demand for the user for allowing access, closed user group (a Closed Subscriber Group, contracting under environment
Be written as CSG) cell or for enclosed type (Closed) cell can only allow defined user (i.e. member) access；Or one mixed
Mould assembly (hybrid) cell is while being preferably that Member Users provide access, or non-member user provides access clothes
Business.Generally, enclosed type cell or mixed type cell are a characteristic features of Home eNodeB, although other classes in some cases
The base station (such as macro base station) of type may also configure enclosed type or mixed type cell.
One Radio Access Network potentially includes polytype cell, i.e. macrocell, Microcell, picocell, so
Radio Access Network be properly termed as heterogeneous network (heterogeneous network, be abbreviated as hetnet).Work as different type
Cell when being disposed with frequency, the fringe region covered in other words in the juncture area of two cells there may be more dry than larger
Disturb.For two cells disturbed, interfered cell (aggressor is referred to as to the cell that neighbor cell produces interference
Cell), disturbed cell is referred to as interfered cell (victim cell).For the UE under victim cell, by dry
Disturb larger UE and be referred to as disturbed user terminal (victim UE), the less UE that is interfered is referred to as general subscriber terminal or non-
Victim UE, wherein fringe region or overlapping region of the disturbed user terminal generally in two MPS process.
In order to solve the interference problem between neighbor cell, existing scheme proposes almost blank subframe (Almost Blank
Subframe, i.e. ABS) technology.Specifically, some descending sub frames are configured to ABS by interfered cell, in ABS, interfered cell
Downlink transfer will be reduced or with relatively low power downlink transfer.So, in interfered cell corresponding with the ABS of interfered cell
Corresponding subframe (can be described as shielded subframe) on, the downlink transfer of interfered cell would not by very big interference,
That is, protect downlink transfer of the interfered cell in these subframes.
UE is to be linked into serving cell by random access procedure, in the random access procedure, and UE is to selected small
Area sends random access guiding (Random Access Preamble), and random access guiding is in specific RACH
Upper transmission, base station is received after random access guiding on a random access channel, can be sent out in accidental access response window to UE
Accidental access response is sent, the accidental access response is the public search space (common by down control channel (PDCCH)
Search space) on Downlink Control Information (DCI) scheduling.The public search space of each subframe can only at most be accommodated
4 Downlink Control Information, and each accidental access response is corresponded to and connect on a RACH in Stochastic accessing
(one or more) random access guiding received, therefore at most responded in 1 shielded subframe in 4 RACHs
On the random access guiding that receives.In fact, due to public search space also need to carrying be used for dispatch system message and
The Downlink Control Information of beep-page message, therefore, the rach that can be responded in 1 shielded subframe is probably
N (n ＜=4).And if the density of the RACH of base station configuration is excessive, it is greater than 4/10 (i.e. every 10 subframes
In have 4 RACHs), UE may be caused to send after random access guiding, and base station possibly can not send out in shielded subframe
The control message for correspondingly sending scheduling accidental access response is sent, causes UE accesses time-out and fails, or UE can not correctly connect
Receive accidental access response and cause access failure.
There are as below methods in the prior art attempts to solve the above problems.Random access guiding set is divided into two subset A
And B, it is disturbed user terminal and uses subset A, general subscriber terminal uses wherein subset B.So base station is done with regard to that can pick out
User is disturbed, disturbed user is given the Downlink Control Information for sending scheduling accidental access response thereby using ABS.It is done so that
Cost is the reduction of the available random access guiding of general subscriber terminal, so as to increase collision probability.For example, definition collision
Probability is to have two or more terminals in access is once attempted (including time, frequency connect at random using same resource
Enter leading) probability, be not difficult to draw, this probability be Pa=1- (N-1)M/NM, wherein N is all number of resources, and M is all ends
The trial access number of times at end.
According to document TR 37.868 parameter list 1, N and M particular value can be calculated.Under 30000 user configurings, such as
Fruit uses a random access guiding set, Pa=7.4%, if subset A is configured with 5% random access resource to disturbed
User terminal is used, and when disturbed user terminal number is less than 1/100 (3~300) of all number of terminals, is come for domestic consumer
Say, Pa7.8% or so.It can be seen that reducing the probability that the available random access guiding of general subscriber terminal increases collision really.
Further, since random access guiding set is divided into two subsets A and B, it is disturbed user terminal and uses subset A, this configuration
Typically can not frequently it change, but the quantity of disturbed user terminal is actually what is be continually changing, therefore it is easy to son occur
The access-in resource and user's actual need for collecting A distribution are mismatched, if allocating subset A in advance according to greatest requirements, can be caused
The waste of access-in resource.Further, since not can know that subset A presence using the terminal of legacy version agreement, also it can not just use
Subset A resource, backward compatibility performance is just reduced.
Table 1：Fundamental simulation parameter (the Basic simulationparameters for of RACH capacity in LTE FDD
RACH capacity for LTE FDD)
Finally, when ABS density is excessively dilute, when accidental access response window is too small, it is even if base station can pick out user terminal
Disturbed user terminal, it is also possible to can not send scheduling Stochastic accessing in time because of not having ABS in accidental access response window
The control message of response.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of accidental access method and system, solve because disturbed user
The problem of collision probability increase that the mode that the random access resource of terminal and general subscriber terminal is reserved respectively is brought.
In order to solve the above-mentioned technical problem, the invention provides a kind of accidental access method, wherein, it is disturbed user terminal
Stochastic accessing is performed using the available random access guiding resource of disturbed user terminal；General subscriber terminal uses described common
The available random access guiding resource of user terminal performs Stochastic accessing；Wherein, it is disturbed the available Stochastic accessing of user terminal
Leader resource is the subset of the available random access guiding resource of general subscriber terminal.
Further, the above method can also have the characteristics that：
The available random access guiding resource information of general subscriber terminal and disturbed user terminal are available random
Access lead resource information is sent by base station by broadcast mode；Or；Before the available Stochastic accessing of general subscriber terminal
Lead resource information and configured information is sent by base station by broadcast mode, before the disturbed available Stochastic accessing of user terminal
Resource information is led to be represented by the available random access guiding resource information of the general subscriber terminal and configured information joint.
Further, the above method can also have the characteristics that：
User terminal also knows the available Physical Random Access Channel information of disturbed user terminal and common use from base station
The available Physical Random Access Channel information of family terminal；
Or, user terminal also knows the available Physical Random Access Channel information of domestic consumer from base station and indicates to believe
Breath, is disturbed the available Physical Random Access Channel information of user terminal and is believed by the available Physical Random Access Channel of domestic consumer
Breath and this configured information, which are combined, to be represented；
Wherein, it is the available physical accidental of general subscriber terminal to be disturbed the available Physical Random Access Channel of user terminal
Access the subset of channel.
Further, the above method can also have the characteristics that：
Disturbed user terminal is whole in disturbed user using the disturbed available random access guiding resource of user terminal
Hold and perform Stochastic accessing on available Physical Random Access Channel；
General subscriber terminal is available in general subscriber terminal using the available random access guiding resource of general subscriber terminal
Physical Random Access Channel on perform Stochastic accessing.
Further, the above method can also have the characteristics that：
User terminal also knows the available Physical Random Access Channel information of all user terminals from base station.
Further, the above method can also have the characteristics that：
Disturbed user terminal is using the disturbed available random access guiding resource of user terminal in all user terminals
Stochastic accessing is performed on available Physical Random Access Channel；
General subscriber terminal is available in all user terminals using the available random access guiding resource of general subscriber terminal
Physical Random Access Channel on perform Stochastic accessing.
Further, the above method can also have the characteristics that：
Disturbed user terminal uses the available random access guiding resource of disturbed user terminal that base station is indicated to base
Stand after transmission random access guiding, receive the use that the base station is sent in shielded subframe to the disturbed user terminal
In the Downlink Control Information for dispatching the corresponding accidental access response of the random access guiding.
Further, the above method can also have the characteristics that：
General subscriber terminal is sent to base station using the available random access guiding resource of disturbed user terminal and connect at random
Enter it is leading after, receive the base station and dispatch described random to being used for of sending of the general subscriber terminal in shielded subframe
The Downlink Control Information of the corresponding accidental access response of access lead；
The general subscriber terminal uses connecing at random outside the available random access guiding resource of disturbed user terminal
Enter leader resource to send after random access guiding to base station, receive the base station and carrying out Stochastic accessing suitable for all terminals
To general subscriber terminal transmission for dispatching under the corresponding accidental access response of the random access guiding in subframe
Row control information.
Further, the above method can also have the characteristics that：
The available random access guiding resource information of disturbed user terminal and Physical Random Access Channel information by
The base station is sent by the one or more in system message, RRC connections reallocation message, Downlink Control Information.
Further, the above method can also have the characteristics that：
The available Physical Random Access Channel information of disturbed user terminal, which includes disturbed user terminal Stochastic accessing, to be made
Time resource information, the frequency resource information that disturbed user terminal Stochastic accessing is used.
Further, the above method can also have the characteristics that：
The base station includes micro-base station, macro base station, femto base station, remote radio-frequency heads, relay station or repeater.
In order to solve the above-mentioned technical problem, the invention provides a kind of random access system, including user terminal, wherein,
The user terminal, during for as disturbed user terminal, is provided using the available random access guiding of disturbed user terminal
Source performs Stochastic accessing；When being additionally operable to as general subscriber terminal, before the available Stochastic accessing of the general subscriber terminal
Lead resource and perform Stochastic accessing；Wherein, it is that general subscriber terminal can be disturbed the available random access guiding resource of user terminal
The subset of random access guiding resource.
Further, said system can also have the characteristics that：
The system also includes base station；The base station, for broadcasting the available random access guiding money of general subscriber terminal
Source information and the available random access guiding resource information of disturbed user terminal；Or；Broadcast general subscriber terminal available
Random access guiding resource information and configured information, the available random access guiding resource information of general subscriber terminal and this instruction
Information consolidation represents the available random access guiding resource information of disturbed user terminal.
Further, said system can also have the characteristics that：
The base station, the available Physical Random Access Channel information of user terminal is disturbed and common for also broadcasting simultaneously
The available Physical Random Access Channel information of user terminal；Or, the available physical accidental access of domestic consumer is also broadcasted simultaneously
Channel information and configured information, the available Physical Random Access Channel information of domestic consumer and this configured information joint represent to be done
Disturb the available Physical Random Access Channel information of user terminal；Wherein, it is disturbed the available physical accidental access letter of user terminal
Road is the subset of the available Physical Random Access Channel of general subscriber terminal.
It is that disturbed user terminal sets scope of resource and this scope of resource belongs to and is not equal to be common in this programme
The scope of resource that user terminal is set, can be solved because the random access resource of disturbed user terminal and general subscriber terminal
The problem of collision probability increase that reserved mode is brought respectively, so that base station can send disturbed in shielded subframe
The accidental access response of user terminal, so as to reduce access delay and probability of failure.
If disturbed user terminal distribute random access resource be set M, be general subscriber terminal distribute with
Machine access-in resource is set N, and set M is set N subset, then removing in set N can not be used by being disturbed user terminal
The resource of set M parts, collision probability is all from ordinary terminal, then collision probability is not than having used the prior art of this programme
Reduction.
Assuming that the scheme of prior art does not use any improved method, the UE numbers of unit resource are 30000, using and background
The configuration of technology equally, 5% random access resource gives disturbed user terminal to use, and it is 300 to be disturbed number of users, then background
Method is caused in technical method and this programme unit resource density contrast such as table 2 below., it is readily seen that this programme is confined
Resource and very close without the density that confined resource is caused, therefore in the case where same initiation Stochastic accessing probability is assumed, touch
Hitting probability also can be fairly close.Following numerical also illustrate that this point.
Table 2
| Background technology method | The inventive method | |
| In 5% resource | 300/5%=6000 | (300+30000*99%*5%)/5%=35700 |
| In 95% resource | 30000*99%/95%=31263 | 30000*99%*95%/95%=29700 |
Using the configuration with prior art equally, 5% random access resource gives disturbed user terminal to use, and is done
1/100 (3~300) that user terminal is less than all number of terminals are disturbed, be can be calculated similar to of the prior art, confined
In resource, PaAll 7.4% or so, and the collision probability without any limitation is very close.It can be seen that, this programme compares existing skill
Art, can effectively be avoided due to the collision probability increase that resource reservation is brought.
Further, since general subscriber terminal can also use confined resource, such access-in resource can be with equiblibrium mass distribution
Disturbed between terminal and general subscriber terminal.It can so reduce in confined access-in resource due to general subscriber terminal
The waste seldom caused.Also allow simultaneously and be normally situated between using the terminal of old protocol version using all resources
Enter, maintain good backward compatibility performance.
Finally, access channel using pre-determined random but do not use the user of specific random access guiding can not be
Protected subframe obtains the scheduling of accidental access response, so that time and modulating-coding side without being confined to protected subframe
Formula, is conducive to improving systematic function, for example, obtain the scheduling of accidental access response as early as possible or use higher modulating-coding side
Formula etc..
Brief description of the drawings
Fig. 1 is the covering schematic diagram for the heterogeneous network that macro-femto coexists；
Fig. 2 is the covering schematic diagram for the heterogeneous network that macro-pico coexists；
Fig. 3 is the basic flow sheet of accidental access method in embodiment.
Embodiment
One Radio Access Network potentially includes polytype cell, i.e. macrocell, Microcell, picocell, so
Radio Access Network be properly termed as heterogeneous network (heterogeneous network, be abbreviated as hetnet).Work as different type
Cell when being disposed with frequency, the fringe region covered in other words in the juncture area of two cells there may be more dry than larger
Disturb.For two cells disturbed, interfered cell (aggressor is referred to as to the cell that neighbor cell produces interference
Cell), disturbed cell is referred to as interfered cell (victim cell).For the UE under victim cell, by dry
Disturb larger UE and be referred to as disturbed user terminal (fringe regions or overlapping region of these UE generally in two MPS process), by
It is referred to as general subscriber terminal to less UE is disturbed.
As shown in figure 1, be a kind of example of the applicable heterogeneous network of this programme, under the scene that macro-femto coexists,
If a UE is in CSG Femto cell coverage areas and can not access the CSG cell, the macro UE (are abbreviated as
MUE) by femto strong jamming, as it is disturbed user terminal.
As shown in Fig. 2 being a kind of example of the applicable heterogeneous network of this programme, in the case where scene coexists in macro-pico, such as
Really a UE then should in the range of pico coverage increase (coverage range extension, be abbreviated as CRE)
Pico UE (being abbreviated as PUE) are as disturbed user terminal by macro strong jamming.
UE is to be linked into serving cell by random access procedure, in the random access procedure, and UE is to selected small
Area sends random access guiding, and random access guiding is sent on specific RACH.Base station possible configuration is not
With the RACH of density, different RACHs can be distinguished by different running time-frequency resources, specifically,
The different RACH of FDD system is distinguished by different subframes (i.e. time resource), the different Stochastic accessing of TDD system
Channel is distinguished jointly by running time-frequency resource.Base station is received after random access guiding on a random access channel, can connect at random
Enter in response window to UE transmission accidental access responses.
As shown in figure 3, in accidental access method, disturbed user terminal connects at random using disturbed user terminal is available
Enter leader resource and perform Stochastic accessing；General subscriber terminal uses the available random access guiding resource of the general subscriber terminal
Perform Stochastic accessing；Wherein, be disturbed the available random access guiding resource of user terminal be general subscriber terminal it is available with
The subset of machine access lead resource.
Disturbed user terminal sends random using the disturbed available random access guiding resource of user terminal to base station
After access lead, base station is sent for dispatching before the Stochastic accessing in shielded subframe to the disturbed user terminal
The Downlink Control Information of corresponding accidental access response is led, this disturbed user terminal receives the base station in shielded subframe
On dispatch the descending of the corresponding accidental access response of the random access guiding to being used for of sending of the disturbed user terminal
Control information.
General subscriber terminal is sent to base station using the available random access guiding resource of disturbed user terminal and connect at random
Enter it is leading after, base station is sent for dispatching the random access guiding pair in shielded subframe to the general subscriber terminal
The Downlink Control Information for the accidental access response answered, this general subscriber terminal receives the base station in shielded subframe to institute
State general subscriber terminal and send Downlink Control Information for dispatching the corresponding accidental access response of the random access guiding.
Before general subscriber terminal is using the Stochastic accessing outside the available random access guiding resource of disturbed user terminal
Lead resource to send after random access guiding to base station, base station is in the subframe for carrying out Stochastic accessing suitable for all terminals to described
General subscriber terminal sends the Downlink Control Information for dispatching the corresponding accidental access response of the random access guiding, and this is general
Logical user terminal is receiving the base station in the subframe that Stochastic accessing is carried out suitable for all terminals to domestic consumer end
The Downlink Control Information for dispatching the corresponding accidental access response of the random access guiding that end is sent.
Wherein, by protect subframe in accidental access response window.
For example, the available random access guiding resource of disturbed user terminal is leading set 1, general subscriber terminal can use
Random access guiding resource for it is leading set 2, it is leading set 1 be it is leading set 2 subset.
The configuration mode of above-mentioned random access guiding resource can be that base station and terminal are not handed over by the way of system default
Mutually and both sides give tacit consent to above-mentioned resources employment methods, it would however also be possible to employ notify that to the mode of terminal (i.e. terminal is from base by base station
Know at station).
For example, advice method one：The available random access guiding resource information of base station broadcast general subscriber terminal and done
Disturb the available random access guiding resource information of user terminal；Illustrate：Indicate that domestic consumer is whole in the broadcast message of base station
Hold the corresponding leading numbering of available random access guiding resource and include leading numbering 1, it is leading numbering 2, leading numbering 3, leading
Numbering 4, leading numbering 5；The corresponding leading numbering of the available random access guiding resource of disturbed user terminal indicated includes
Lead numbering 1, leading numbering 2, leading numbering 3.
Advice method two：The available random access guiding resource information of base station broadcast general subscriber terminal and configured information,
The available random access guiding resource information of general subscriber terminal and this configured information joint represent that disturbed user terminal can use
Random access guiding resource information.Illustrate：Indicate that general subscriber terminal is available in the broadcast message of base station to connect at random
Entering the corresponding leading numbering of leader resource includes leading numbering 1, leading numbering 2, leading numbering 3, leading numbering 4, leading numbering
5；Configured information is 3, then being disturbed the corresponding leading numbering of the available random access guiding resource of user terminal includes leading compile
Number 1, leading numbering 2, leading numbering 3.
Under the configuration mode of above-mentioned random access guiding resource, base station can also carry out Physical Random Access Channel simultaneously
Configuration.
Configuration mode one, is that disturbed user terminal is available for disturbed user terminal configuration Physical Random Access Channel
Physical Random Access Channel is set 3, is that general subscriber terminal configuration Physical Random Access Channel i.e. general subscriber terminal can use
Physical Random Access Channel for set 4, set 3 be gather 4 subsets.
The configuration mode of Physical Random Access Channel can be that base station and terminal are not interacted simultaneously by the way of system default
And both sides give tacit consent to above-mentioned resources employment methods, it would however also be possible to employ notified by base station to the mode of terminal.
For example, advice method one：The available Physical Random Access Channel letter of disturbed user terminal is also broadcasted simultaneously in base station
Breath and the available Physical Random Access Channel information of general subscriber terminal；The terminal knows above-mentioned letter by the broadcast of base station
Breath.
Advice method two：The available Physical Random Access Channel information of domestic consumer is also broadcasted simultaneously and indicates to believe in base station
Breath, the available Physical Random Access Channel information of domestic consumer and this configured information joint represent that disturbed user terminal is available
Physical Random Access Channel information, the terminal knows above- mentioned information by the broadcast of base station.
In configuration mode once, it is disturbed user terminal and uses the available random access guiding resource of disturbed user terminal
Stochastic accessing is performed on the disturbed available Physical Random Access Channel of user terminal；General subscriber terminal uses domestic consumer
The available random access guiding resource of terminal performs Stochastic accessing on the available Physical Random Access Channel of general subscriber terminal.
Configuration mode two is that disturbed user terminal and general subscriber terminal distribute identical Physical Random Access Channel,
I.e. all available Physical Random Access Channels of user terminal user.
Under configuration mode two, it is disturbed user terminal and uses the available random access guiding resource of disturbed user terminal
Stochastic accessing is performed on the available Physical Random Access Channel of all user terminals；General subscriber terminal is whole using domestic consumer
Available random access guiding resource is held to perform Stochastic accessing on the available Physical Random Access Channel of all user terminals.
In this method, be disturbed user terminal available Physical Random Access Channel information include disturbed user terminal with
The time resource information that machine access is used, the frequency resource information that disturbed user terminal Stochastic accessing is used.
Base station sends the quilt by the one or more in system message, RRC connections reallocation message, Downlink Control Information
Disturb the available random access guiding resource information of user terminal and Physical Random Access Channel information.
The base station includes micro-base station, macro base station, femto base station, remote radio-frequency heads, relay station or repeater.
Random access system corresponding with the above method, including user terminal, wherein, the user terminal, for conduct
During disturbed user terminal, Stochastic accessing is performed using the available random access guiding resource of disturbed user terminal；It is additionally operable to
During as general subscriber terminal, Stochastic accessing is performed using the available random access guiding resource of the general subscriber terminal；Its
In, it is the available random access guiding resource of general subscriber terminal to be disturbed the available random access guiding resource of user terminal
Subset.
The system also includes base station, and the function of the base station is corresponding to described in the above method identical, no longer goes to live in the household of one's in-laws on getting married herein
State.
Illustrate this programme with reference to different application scenarios.
Embodiment one (the Stochastic accessing embodiments of the invention based on competition).
UE in idle or connected state is potentially based on the measurement of itself and the broadcast message from base station judges oneself
It is a disturbed user terminal.Disturbed user terminal is by system broadcast message reception base station transmission to being disturbed user
The available random access guiding information of terminal.The available random access guiding information of disturbed user terminal can be in SIB2
(SystemInformationBlock2) carried in.
Broadcast message can be carried only to the available one or more random access guidings of disturbed user terminal, be disturbed
User terminal completes random access procedure using the random access guiding limited in broadcast message.
In broadcast message in addition to carrying to the disturbed available one or more random access guidings of user terminal, may be used also
To carry the available RACH information of disturbed user terminal.
When indicating to carry access channel information in broadcast message, this information can indicate the available Stochastic accessings of all UE
The a subset (limiting the set of random access channels that disturbed user terminal is used) of channel, or indicate whether to be disturbed
Whether user terminal can be used (is disturbed user terminal and can use and appoint in other words to the available RACHs of all UE
The RACH of meaning, is disturbed whether user terminal is restricted using RACH in other words), or refer to indirectly
Show to whether the special protection mechanism for being disturbed user terminal opens.
The disturbed available RACH of user terminal can be general subscriber terminal and disturbed user terminal without
The RACH that the RACH used of difference or the disturbed user terminal of limitation are used is (common to use
Family terminal can equally be used with indiscriminate).If the disturbed available RACH of user terminal is that all users can
During RACH, user terminal is disturbed using the random access guiding limited in broadcast message from all users
Stochastic accessing is performed on the RACH selected in available RACH.If disturbed user terminal can use
RACH when being part RACH in the available RACH of all users, be disturbed user terminal
Believed using the random access guiding limited in broadcast message in the Stochastic accessing selected out of described part RACH
Stochastic accessing is performed on road.
Base station receive after the available random access guiding of disturbed user terminal shielded subframe (subframe with
In machine access response window) on send Downlink Control Information (DCI) for dispatching accidental access response, the DCI uses basis
The running time-frequency resource of RACH calculates obtained RA-RNTI and carries out CRC scramblings.Base station can be in the lump in shielded subframe
Upper transmission accidental access response.Accidental access response is included in MAC PDU, and base station is directed on same RACH
The accidental access response of the multiple random access guidings received can be included in a MAC PDU.
Disturbed user terminal uses the RACH selected according to its own in accidental access response window
Running time-frequency resource calculates the public search space that obtained RA-RNTI attempts solution descending sub frame, if understood successfully, and UE is read
Schedule information in DCI, and include the MAC PDU of 0 to n accidental access response according to schedule information reception.If base station
It is the Downlink Control Information transmitted in shielded subframe, then is disturbed user terminal and is received in shielded subframe
Downlink Control Information corresponding with the RA-RNTI that it is calculated；If base station transmits Stochastic accessing sound in shielded subframe
Should, then being disturbed user terminal and also being received in shielded subframe includes the MAC of 0 to n accidental access response accordingly
PDU.The index for the random access guiding (i.e. random access sequence) that UE uses the RAPID in the PDU with it is compared, such as
Fruit has RAPID identical with the index for the random access guiding that it is used, then the corresponding accidental access response of UE readings, and according to
Accidental access response continues executing with the subsequent operation of Stochastic accessing, for example, sent and disappeared to base station according to uplink authorization (UL-GRANT)
Cease 3 (message3).
For general subscriber terminal (including the non-disturbed terminal of legacy UE, such as R8/R9/10UE, or R11),
These general subscriber terminals send arbitrary available random using the general available RACHs of UE all in other words
Access lead.If the random access guiding of general subscriber terminal selection is exactly the available Stochastic accessing of disturbed user terminal
Leading, base station is that disturbed user terminal or general subscriber terminal are sent out without the random access guiding for distinguishing competition, therefore
Also used with the transmission method disturbed user terminal for the accidental access response of these general subscriber terminals.It is actual
On, the accidental access response of general subscriber terminal and disturbed user terminal can be included in a MAC PDU, and by
One DCI scheduling.So, base station also sends corresponding with the RA-RNTI of these general subscriber terminals in shielded subframe
DCI, can also send the RAR of general subscriber terminal in shielded subframe.If general subscriber terminal and domestic consumer are whole
The RACH for holding selection is not the available RACH of disturbed user terminal, then base station need not use and be protected
The subframe of shield sends DCI and/or RAR.
Embodiment two (based on non-competing Stochastic accessing embodiments of the invention).
UE in connected state can receive the DCI, the DCI that are produced by PDCCH order (order) of base station transmission
It is required that UE performs random access procedure and indicates that UE is initiated before the RACH that should use of Stochastic accessing and Stochastic accessing
Lead.
Base station is indicated to being disturbed the available random access guiding of user terminal by Downlink Control Information.It is noted that
The random access guiding is that limitation is used to disturbed user terminal, does not have any limitation to general subscriber terminal.
Base station can be the random access guiding according to oneself judgement (such as when not being disturbed user terminal)
General subscriber terminal is distributed to use.User terminal is either disturbed to send before the still general subscriber terminal transmission access
Lead, base station is received after the random access guiding then in shielded subframe (subframe is in accidental access response window)
The Downlink Control Information (DCI) for dispatching accidental access response is sent, the DCI uses the time-frequency according to RACH
The RA-RNTI that Resource Calculation is obtained carries out CRC scramblings.Base station can send Stochastic accessing in the lump in shielded subframe and ring
Should.Accidental access response is included in MAC PDU, and base station is directed to multiple connecing at random of being received on same RACH
Entering leading accidental access response can be included in a MAC PDU.
Disturbed user terminal is used in accidental access response window to be calculated according to the running time-frequency resource of RACH
Obtained RA-RNTI attempts the public search space of solution descending sub frame, if understood successfully, and UE reads the scheduling letter in DCI
Breath, and include the MAC PDU of 0 to n accidental access response according to schedule information reception.If base station is in shielded son
The Downlink Control Information transmitted on frame, then it is that the RA- calculated with it is received in shielded subframe to be disturbed user terminal
The corresponding Downlink Control Information of RNTI；If base station transmits accidental access response in shielded subframe, it is disturbed and uses
Family terminal is also received in shielded subframe includes the MACPDU of 0 to n accidental access response accordingly.UE is by the PDU heads
In the indexes of random access guiding (i.e. random access sequence) that are used with it of RAPID compared, if RAPID is used with it
Random access guiding index it is identical, then UE reads corresponding accidental access response, and is continued according to accidental access response
Perform subsequent operation.
Embodiment three (Stochastic accessing embodiments of the invention in handoff procedure).
In handoff procedure, source base station and target BS may switch over preparation flow by X2 or S1 interfaces, if
Prepare successfully, then target BS sends switching command message to source base station, what the message may be transparent is carried on X2 or S1 message
In (S1 message is also forwarded by MME).
Switching command message includes a complete DL-DCCH message (the DL-DCCH message issues UE by source base station),
Including RRC connection reallocation messages, the message includes the available random access guiding information of disturbed user terminal.UE makes
With the random access guiding of instruction Stochastic accessing is initiated to target BS.It is noted that the random access guiding be limitation to
Disturbed user terminal is used, and does not have any limitation to general subscriber terminal.
Base station can be the random access guiding according to oneself judgement (such as when not being disturbed user terminal)
General subscriber terminal is distributed to use.User terminal is either disturbed to send before the still general subscriber terminal transmission access
Lead, target BS receives after described random access guiding that then (subframe is in accidental access response window in shielded subframe
It is interior) on send Downlink Control Information (DCI) for dispatching accidental access response, the DCI is used according to RACH
Running time-frequency resource calculates obtained RA-RNTI and carries out CRC scramblings.Target BS can send random in shielded subframe in the lump
Access response.Accidental access response is included in MAC PDU, and target BS is directed to what is received on same RACH
The accidental access response of multiple random access guidings can be included in a MAC PDU.
Disturbed user terminal is used in accidental access response window to be calculated according to the running time-frequency resource of RACH
Obtained RA-RNTI attempts the public search space of solution descending sub frame, if understood successfully, and UE reads the scheduling letter in DCI
Breath, and include the MAC PDU of 0 to n accidental access response according to schedule information reception.If target BS is protected
Subframe on the Downlink Control Information that transmits, then it is to receive to calculate with it in shielded subframe to be disturbed user terminal
The corresponding Downlink Control Information of RA-RNTI；If target BS transmits accidental access response in shielded subframe, by
Disturb user terminal also to be received in shielded subframe includes the MAC PDU of 0 to n accidental access response accordingly.UE will
The index for the random access guiding (i.e. random access sequence) that RAPID in the PDU is used with it is compared, if RAPID
Identical with the index for the random access guiding that it is used, then UE reads corresponding accidental access response, and according to Stochastic accessing
Response continues executing with subsequent operation, including sends RRC connections again with completion message to target BS.
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually it is combined.
Certainly, the present invention can also have other various embodiments, ripe in the case of without departing substantially from spirit of the invention and its essence
Various corresponding changes and deformation, but these corresponding changes and deformation can be made according to the present invention by knowing those skilled in the art
The protection domain of appended claims of the invention should all be belonged to.
One of ordinary skill in the art will appreciate that all or part of step in the above method can be instructed by program
Related hardware is completed, and described program can be stored in computer-readable recording medium, such as read-only storage, disk or CD
Deng.Alternatively, all or part of step of above-described embodiment can also use one or more integrated circuits to realize.Accordingly
Each module/unit in ground, above-described embodiment can be realized in the form of hardware, it would however also be possible to employ the shape of software function module
Formula is realized.The present invention is not restricted to the combination of the hardware and software of any particular form.
Claims (14)
1. a kind of accidental access method, wherein,
Disturbed user terminal performs Stochastic accessing using the disturbed available random access guiding resource of user terminal；
General subscriber terminal performs Stochastic accessing using the available random access guiding resource of the general subscriber terminal；
Wherein, it is the available random access guiding of general subscriber terminal to be disturbed the available random access guiding resource of user terminal
The subset of resource, so that base station can send the accidental access response of disturbed user terminal in shielded subframe.
2. the method as described in claim 1, it is characterised in that
The available random access guiding resource information of general subscriber terminal and the available Stochastic accessing of disturbed user terminal
Leader resource information is sent by base station by broadcast mode；Or；
The available random access guiding resource information of general subscriber terminal and configured information are sent out by base station by broadcast mode
Send, the disturbed available random access guiding resource information of user terminal is connect at random by the general subscriber terminal is available
Enter leader resource information and configured information joint is represented.
3. method as claimed in claim 2, it is characterised in that
User terminal also knows that the available Physical Random Access Channel information of disturbed user terminal and domestic consumer are whole from base station
Hold available Physical Random Access Channel information；
Or, user terminal also knows the available Physical Random Access Channel information of domestic consumer and configured information, quilt from base station
Disturb the available Physical Random Access Channel information of user terminal by the available Physical Random Access Channel information of domestic consumer and
This configured information joint is represented；
Wherein, it is the available physical accidental access of general subscriber terminal to be disturbed the available Physical Random Access Channel of user terminal
The subset of channel.
4. method as claimed in claim 3, it is characterised in that
Disturbed user terminal can in disturbed user terminal using the available random access guiding resource of disturbed user terminal
Stochastic accessing is performed on Physical Random Access Channel；
General subscriber terminal is using the available random access guiding resource of general subscriber terminal in the available thing of general subscriber terminal
Stochastic accessing is performed on reason RACH.
5. method as claimed in claim 2, it is characterised in that
User terminal also knows the available Physical Random Access Channel information of all user terminals from base station.
6. method as claimed in claim 5, it is characterised in that
Disturbed user terminal is available in all user terminals using the disturbed available random access guiding resource of user terminal
Physical Random Access Channel on perform Stochastic accessing；
General subscriber terminal is using the available random access guiding resource of general subscriber terminal in the available thing of all user terminals
Stochastic accessing is performed on reason RACH.
7. the method as described in claim 3,4,5 or 6, it is characterised in that
The available random access guiding resource of disturbed user terminal that disturbed user terminal is indicated using base station is sent out to base station
Send after random access guiding, the reception base station is in shielded subframe to the disturbed user terminal transmission for adjusting
Spend the Downlink Control Information of the corresponding accidental access response of the random access guiding.
8. the method as described in claim 3,4,5 or 6, it is characterised in that
General subscriber terminal is sent before Stochastic accessing using the disturbed available random access guiding resource of user terminal to base station
After leading, the reception base station is in shielded subframe to general subscriber terminal transmission for dispatching the Stochastic accessing
The Downlink Control Information of leading corresponding accidental access response；
Before the general subscriber terminal is using the Stochastic accessing outside the available random access guiding resource of disturbed user terminal
Lead resource to send after random access guiding to base station, receive the base station and the subframe of Stochastic accessing is being carried out suitable for all terminals
On dispatch the descending control of the corresponding accidental access response of the random access guiding to being used for of sending of the general subscriber terminal
Information processed.
9. the method as described in claim 3,4,5 or 6, it is characterised in that
The available random access guiding resource information of disturbed user terminal and Physical Random Access Channel information are by described
Base station is sent by the one or more in system message, RRC connections reallocation message, Downlink Control Information.
10. the method as described in claim 3,4,5 or 6, it is characterised in that
The available Physical Random Access Channel information of disturbed user terminal includes what disturbed user terminal Stochastic accessing was used
Time resource information, the frequency resource information that disturbed user terminal Stochastic accessing is used.
11. method as claimed in claim 2, it is characterised in that
The base station includes micro-base station, macro base station, femto base station, remote radio-frequency heads, relay station or repeater.
12. a kind of random access system, including user terminal, wherein,
The user terminal, during for as disturbed user terminal, before the available Stochastic accessing of disturbed user terminal
Lead resource and perform Stochastic accessing；When being additionally operable to as general subscriber terminal, connect at random using the general subscriber terminal is available
Enter leader resource and perform Stochastic accessing；
Wherein, it is the available random access guiding of general subscriber terminal to be disturbed the available random access guiding resource of user terminal
The subset of resource, so that base station can send the accidental access response of disturbed user terminal in shielded subframe.
13. system as claimed in claim 12, it is characterised in that
The system also includes base station；
The base station, can for broadcasting the available random access guiding resource information of general subscriber terminal and disturbed user terminal
Random access guiding resource information；Or；Broadcast the available random access guiding resource information of general subscriber terminal and refer to
Show information, the available random access guiding resource information of general subscriber terminal and this configured information joint represent that disturbed user is whole
Hold available random access guiding resource information.
14. system as claimed in claim 13, it is characterised in that
The base station, for also broadcasting the disturbed available Physical Random Access Channel information of user terminal and domestic consumer simultaneously
The available Physical Random Access Channel information of terminal；Or, the available Physical Random Access Channel of domestic consumer is also broadcasted simultaneously
Information and configured information, the available Physical Random Access Channel information of domestic consumer and this configured information joint represent disturbed and used
The available Physical Random Access Channel information of family terminal；Wherein, being disturbed the available Physical Random Access Channel of user terminal is
The subset of the available Physical Random Access Channel of general subscriber terminal.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP3018962B1 (en) * | 2013-08-14 | 2022-01-26 | Huawei Technologies Co., Ltd. | Method for randomly accessing a network, and terminal |
| WO2016119111A1 (en) * | 2015-01-26 | 2016-08-04 | 华为技术有限公司 | Random access method, terminal and base station |
| CN105307284B (en) * | 2015-11-30 | 2019-01-11 | 东莞酷派软件技术有限公司 | A kind of accidental access method and user equipment |
| WO2019056173A1 (en) * | 2017-09-19 | 2019-03-28 | 北京小米移动软件有限公司 | Random access method and apparatus, and electronic device and computer-readable storage medium |
| CN109587769B (en) * | 2017-09-28 | 2022-02-22 | 中兴通讯股份有限公司 | Data transmission method and device and search space optimization method and device |
| CN110099459B (en) * | 2018-01-31 | 2021-07-20 | 华为技术有限公司 | Method and device for random access |
| CN112564782B (en) * | 2019-09-26 | 2022-03-11 | 中国电信股份有限公司 | Repeater detection method, device, network management system and storage medium |
| CN113498213A (en) * | 2020-04-03 | 2021-10-12 | 华为技术有限公司 | Method, device and system for random access |
| CN115150874A (en) * | 2022-07-25 | 2022-10-04 | 承德石油高等专科学校 | A method and device for evaluating a communication base station |
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