CN101400145A - Random access collision back-off method - Google Patents
Random access collision back-off method Download PDFInfo
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- CN101400145A CN101400145A CNA2007101615963A CN200710161596A CN101400145A CN 101400145 A CN101400145 A CN 101400145A CN A2007101615963 A CNA2007101615963 A CN A2007101615963A CN 200710161596 A CN200710161596 A CN 200710161596A CN 101400145 A CN101400145 A CN 101400145A
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Abstract
The invention provides a random access collision retreat method, comprising: the step S102, classifying service of triggering the random access operation, and distributing threshold values to the classified service, performing random access operation according to the threshold values by user terminals, wherein the step S104 comprises: the step S104a, the user terminals generates random number, and compares the random number with the threshold values, and the step S104b, the user terminals randomly select a signature code from available random access signature code aggregate and transmit to the network side to perform random access operation, when the comparing result of the random number and the threshold values satisfies the scheduled requirement; when the comparing result of the random number and the threshold values does not satisfy the scheduled requirement, returning to the step S104a.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of random access collision back-off method that is used for communication system.
Background technology
Evolution and development of Communication Technique along with network, the mobile communication system of a new generation must can support 100Mbps (Mbps: MBPS) transmission quality that Yi Shang all-IP high-speed packet data transmission, the high terminal mobility of support, support are high, high spectrum efficiency and power efficiency is provided, and can effectively be supported in the variation of great dynamic ranges such as user data rate, user capacity, service quality and translational speed.Because the increase of user density, the increasing of traffic carrying capacity and the raising of translational speed, cause the anxiety of random access resource, so when guaranteeing user's cut-in quality, must further improve the service efficiency and the using method of random access resource, wherein avoidance mechanism is exactly a kind of resource allocation means commonly used when inserting triggering at random.
Mainly contain dual mode for inserting avoidance mechanism at random in the existing communication system: a kind of is to be representative with 802.11e, according to different business different variable methods of keeping out of the way window is set and realizes the avoidance mechanism that inserts at random; Second kind is with TD-SCDMA (TimeDivision-Synchronous Code Division Multiple Access, the Time Division-Synchronous Code Division Multiple Access access) system is representative, use MAC (Medium Access Control, the medium access control) Ceng MLP (MAC Logical channel Priority, priority of logical channels) with ASC (Access Service Class, access service grade) between the method for being mutually related realize avoidance mechanism.Two kinds of methods all can only be applied in its concrete system existing system is of limited application.Prior art mainly utilizes in the concrete system a certain parameter to realize avoidance mechanism, and the scope of application is limited, and for the avoidance mechanism of Beyond 3G system and with to trigger the probability avoidance mechanism concern that access service is relevant at random less.
Summary of the invention
One or more problems in view of the above the present invention proposes a kind of random access collision back-off method, and the method is used for reducing when system load is big, are initiated to insert at random the problem of the high collision probability in back by terminal.
Random access collision back-off method according to the present invention may further comprise the steps: step S102, the business that triggers access operation is at random classified, and to sorted traffic assignments threshold value; And the pairing threshold value of each classify traffic can be identical, also can be different.And step S104, user terminal carries out access operation at random according to threshold value.
Wherein, in step S102, the business that triggers access operation is at random classified according to the real-time property of business.Described threshold value to sorted traffic assignments can be identical, also can be different.
Wherein, step S104 may further comprise the steps: step S104a, and user terminal generates random number, and random number and threshold value are compared; And step S104b, comparative result in random number and threshold value satisfies under the situation of pre-provisioning request, user terminal is concentrated the picked at random signed codevector and signed codevector is sent to network side to carry out access operation at random at the available signed codevector of access at random, comparative result in random number and threshold value does not satisfy under the predetermined situation about requiring, and returns step S104a.
In step S104b, pre-provisioning request is meant that random number is not more than threshold value.The span of random number is 0 to 1 real number.Wherein, the span of threshold value is 0 to 1 real number.
This random access collision back-off method is applicable to that all trigger the business that inserts at random.By random access collision back-off method of the present invention, use this kind collision back-off method, on the macroscopic view, can realize collision accident is expanded on time domain at hot zones or the bigger place of sub-district internal burden, collision probability problem of higher when initiating to insert at random to reduce the high capacity community user, and then reduced the repeating transmission number of times of signed codevector, improved the throughput of system.On the microcosmic, for different business different threshold values can be set, high-priority service is provided with high pass and crosses thresholding, and low priority traffice is provided with low pass and crosses thresholding, can guarantee that like this high-priority service is inserted faster, also realize for the difference control that inserts at random between the different business.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to random access collision back-off method of the present invention; And
Fig. 2 is the flow chart according to the random access collision back-off method of the embodiment of the invention.
Embodiment
Below with reference to accompanying drawing, describe the specific embodiment of the present invention in detail.
In the method for the invention, random access procedure in the sub-district is classified according to different triggering classs of service, and make the method for different classes of corresponding certain numerical value finish the realization of avoidance mechanism in the random access procedure.
Fig. 1 is the flow chart according to random access collision back-off method of the present invention.As shown in Figure 1, this method may further comprise the steps:
S102 classifies to triggering the business that inserts at random, and to sorted type of service portion gate limit value; And
S104, user terminal inserts at random according to dependent threshold.
Wherein, the pairing threshold value of each classify traffic can be identical, also can be different.
In step S102, classify to triggering the business that inserts at random according to professional real-time property.
Wherein, step S104 may further comprise the steps:
Step S104a, user terminal generates random number, and random number and threshold value are compared; And
Step S104b, comparative result in random number and threshold value satisfies under the situation of pre-provisioning request, user terminal is concentrated the picked at random signed codevector and signed codevector is sent to network side to carry out access operation at random at the available signed codevector of access at random, comparative result in random number and threshold value does not satisfy under the predetermined situation about requiring, and returns step S104a.
In step S104b, pre-provisioning request is meant that random number is not more than threshold value.
Preferably, real-time property generally can be divided into two grades: real time business and non-real-time service with professional relevant to the requirement of time delay.
Preferably, insert high priority or use the dedicated signatures sign indicating number, insert low priority or use the common signature sign indicating number for non-real-time service for real time business.
Preferably, random access collision back-off method according to the present invention is used for the business that all use dedicated signatures sign indicating number and common signature sign indicating number.
To every kind of related numerical value Pi of the classification of access service at random of having divided.Pi is a probability numbers, and span is 0 to 1 real number.The size of Pi value has embodied UE (UserEquipment, subscriber equipment) and has judged whether to use current PRACH (PhysicalRandom Access Channel, Physical Random Access Channel) resource to carry out the probability size of random access procedure.High-priority service is provided with high Pi value, and low priority traffice is provided with low Pi value.Make high-priority service to be inserted faster like this, and also realized for the control of the difference between the access service at random.
User terminal existing insert at random trigger after, according to triggering the corresponding corresponding Pi value of classification, and this Pi value as this professional judgement threshold.UE uses this threshold value Pi, utilizes the permission that judges whether of numerical value comparative approach to use current PRACH channel to carry out random access procedure.
The numerical value comparative approach has multiple mode to realize; Preferably, the numerical value comparative approach is to produce numerical value Ri at random by UE.In the differentiation cycle, in a single day random number Ri produces and just can not change.Compare the foundation whether result relatively inserts at current access period at random as UE with a Ri side and Pi value as a comparison.The span of the random number Ri that produces is 0 to 1 real number.
When the comparative result of Ri and Pi allows UE after current access period at random carries out random access procedure, UE concentrates at the available signed codevector of access at random and selects signed codevector, the selection mode of signed codevector can be a various ways, preferably, concentrate at random a certain signed codevector of choosing at available signed codevector, wait in up link, sending to network side.
UE refreshes the physical layer wireless channel parameter that sends signed codevector according to the result who selects signed codevector, then sends selected signed codevector in recently available random access time slot.
The wireless channel parameter comprises the power that transmits signed codevector, available running time-frequency resource etc.
When UE sends selected signed codevector in up link after, will in corresponding running time-frequency resource scope, wait for network side to the replying of this signed codevector, and continue to finish remaining random access procedure.
Professional classification is corresponding with the Pi collection
UE is apprised of the professional mode classification Pi value corresponding with it by system broadcasts or other modes, and is as shown in table 1.
Table 1 inserts load at random according to delineation of activities
| Sequence number | Trigger the related service of RA | Professional real-time | Probable value |
| a) | Tracking?Area?Update | NRT | P 1 |
| b) | RT?Call(MO+MT?Call) | NRT+RT | P 2 |
| c) | NRT?Call | NRT | P 3 |
| d) | RT?HO | RT | P 4 |
| e) | NRT?HO | NRT | P 5 |
Back-off keeps out of the way realization mechanism
According to the correlation of top principle of classification and Pi value, the UE side will be carried out following operation to be implemented in the back-off mechanism in the random access procedure.Fig. 2 is the flow chart according to the random access collision back-off method of the embodiment of the invention.As shown in Figure 2, this method may further comprise the steps:
UE is apprised of type of service collection and its respective value probable value collection that triggering inserts at random by system broadcasts or other modes;
S202～S206, when inserting triggering at random, it is corresponding with corresponding Pi value in the probable value set that UE will trigger a certain concrete business that inserts at random, and obtain the value of concrete Pi;
S208～S220, UE carries out the random access procedure initialization.UE will produce a random value Ri this moment, with the comparative result of this random value Ri and Pi value as whether in current random access time slot the foundation of startup physical layer PRACH transport process;
S222～S224, when comparative result made that UE allows physical layer to carry out the transmission of signed codevector in current random access time slot, the physical layer of UE was with initialization PRACH transport process and transmit signed codevector.When if comparative result does not allow the UE physical layer to send signed codevector in current random access time slot, then UE will carry out a new sending probability and detect and repeat this process in next random access time slot, till signed codevector is allowed to transmission;
S226～S230 is after UE sends signed codevector, and UE will wait in certain window from the response RA Response of network side to this signed codevector.Respond if receive this, UE will continue following random access procedure; Otherwise UE does not receive that the RA Response from network side responds, and this moment, UE will carry out the transmission permission differentiation of signed codevector again.If the number of transmissions of signed codevector does not also surpass maximum times---the Mmax that allows to attempt transmission, UE will begin a new sending probability testing process at next random access time slot so, and repeat said process; If the number of transmissions of signed codevector surpasses the maximum the number of transmissions that allows, UE will withdraw from the RACH process so, and obtain failure information.
Wherein, can use timer guarantee two continuous sending probabilities detect between at least at interval one insert the efficient of differentiating to improve at interval turn-on time at random.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a random access collision back-off method is characterized in that, may further comprise the steps:
Step S102 classifies to the business that triggers access operation at random, and to sorted traffic assignments threshold value; And
Step S104, user terminal carries out described access operation at random according to threshold value.
2. random access collision back-off method according to claim 1 is characterized in that, in step S102, according to the real-time property of described business the business that triggers described access operation is at random classified.
3. random access collision back-off method according to claim 2 is characterized in that, and is identical or different to the described threshold value that sorted different business distributes.
4. according to each described random access collision back-off method of claim 1 to 3, it is characterized in that described step S104 may further comprise the steps:
Step S104a, described user terminal generates random number, and described random number and described threshold value are compared; And
Step S104b, comparative result in described random number and described threshold value satisfies under the situation of pre-provisioning request, described user terminal is concentrated the picked at random signed codevector and described signed codevector is sent to network side to carry out described access operation at random at the available signed codevector of access at random, comparative result in described random number and described threshold value does not satisfy under the predetermined situation about requiring, and returns step S104a.
5. random access collision back-off method according to claim 4 is characterized in that, in step S104b, described pre-provisioning request is meant that described random number is not more than described threshold value.
6. random access collision back-off method according to claim 5 is characterized in that, the span of described random number is 0 to 1 real number.
7. random access collision back-off method according to claim 6 is characterized in that, the span of described threshold value is 0 to 1 real number.
8. random access collision back-off method according to claim 5 is characterized in that, described method is applicable to that all trigger the business that inserts at random.
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| CNA2007101615963A CN101400145A (en) | 2007-09-29 | 2007-09-29 | Random access collision back-off method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102014516A (en) * | 2010-11-18 | 2011-04-13 | 北京邮电大学 | Random access method in (LTE)-A system |
| WO2011066795A1 (en) * | 2009-12-02 | 2011-06-09 | 华为技术有限公司 | Method and apparatus for network access |
| CN102118859A (en) * | 2009-12-31 | 2011-07-06 | 华为技术有限公司 | Methods, devices and systems for accessing to wireless network and sending page message |
| CN102958189A (en) * | 2011-08-26 | 2013-03-06 | 华为技术有限公司 | Random access method and user equipment |
| CN102972083A (en) * | 2010-06-23 | 2013-03-13 | 索尼公司 | Wireless communication device, wireless communication system, wireless communication method, and base station |
| CN104796942A (en) * | 2015-04-20 | 2015-07-22 | 天津大学 | LTE (long term evolution)-Advanced system based random access overload control method |
| WO2017036258A1 (en) * | 2015-09-02 | 2017-03-09 | 华为技术有限公司 | Contention access method, contention access device, base station and contention access system |
| CN108702680A (en) * | 2017-08-29 | 2018-10-23 | 北京小米移动软件有限公司 | Execute the methods, devices and systems of access control |
| CN109699089A (en) * | 2017-10-20 | 2019-04-30 | 中移(苏州)软件技术有限公司 | A kind of channel access method and device |
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2007
- 2007-09-29 CN CNA2007101615963A patent/CN101400145A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011066795A1 (en) * | 2009-12-02 | 2011-06-09 | 华为技术有限公司 | Method and apparatus for network access |
| CN102118859A (en) * | 2009-12-31 | 2011-07-06 | 华为技术有限公司 | Methods, devices and systems for accessing to wireless network and sending page message |
| US9591672B2 (en) | 2010-06-23 | 2017-03-07 | Sony Corporation | Wireless communication device, wireless communication system, wireless communication method, and base station |
| CN102972083A (en) * | 2010-06-23 | 2013-03-13 | 索尼公司 | Wireless communication device, wireless communication system, wireless communication method, and base station |
| CN102014516A (en) * | 2010-11-18 | 2011-04-13 | 北京邮电大学 | Random access method in (LTE)-A system |
| CN102958189A (en) * | 2011-08-26 | 2013-03-06 | 华为技术有限公司 | Random access method and user equipment |
| CN104796942A (en) * | 2015-04-20 | 2015-07-22 | 天津大学 | LTE (long term evolution)-Advanced system based random access overload control method |
| WO2017036258A1 (en) * | 2015-09-02 | 2017-03-09 | 华为技术有限公司 | Contention access method, contention access device, base station and contention access system |
| CN108702680A (en) * | 2017-08-29 | 2018-10-23 | 北京小米移动软件有限公司 | Execute the methods, devices and systems of access control |
| WO2019041125A1 (en) * | 2017-08-29 | 2019-03-07 | 北京小米移动软件有限公司 | Access control execution method, device and system |
| US11153805B2 (en) | 2017-08-29 | 2021-10-19 | Beijing Xiaomi Mobile Software Co., Ltd. | Access control execution method, device, and system |
| CN109699089A (en) * | 2017-10-20 | 2019-04-30 | 中移(苏州)软件技术有限公司 | A kind of channel access method and device |
| CN109699089B (en) * | 2017-10-20 | 2020-11-20 | 中移(苏州)软件技术有限公司 | Channel access method and device |
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Open date: 20090401 |