CN102291845B - Accidental access method and system - Google Patents
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- CN102291845B CN102291845B CN201010211755.8A CN201010211755A CN102291845B CN 102291845 B CN102291845 B CN 102291845B CN 201010211755 A CN201010211755 A CN 201010211755A CN 102291845 B CN102291845 B CN 102291845B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
- H04W74/0838—Random access procedures, e.g. with 4-step access using contention-free random access [CFRA]
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Abstract
The invention discloses a kind of accidental access method and system.Wherein, this accidental access method comprises: wireless access network element adopts system message or beep-page message to be designated as to the terminal of intended service the random access resource that intended service distributes, wherein, to comprise in shared PRACH special leads preamble code and/or special PRACH for this random access resource, and the configuration information of this special PRACH indicates respectively from the configuration information of this shared PRACH in different system messages or beep-page message; The terminal of intended service uses this random access resource to carry out Stochastic accessing.By the present invention, avoid because the business demand of intended service causes the impact on other general service terminals.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of accidental access method and system.
Background technology
Due to the mobile terminal enormous amount of M2M (Internet of Things), therefore, the connection of initiation and network exists sudden.Such as, when recovering after certain region power failure, all M2M terminal in this region all will initiate to be connected to the request of network to register at network, thus can bring the network connecting request of magnanimity; Or in the M2M application of monitoring, the M2M end sensor of magnanimity triggers response to same event, almost synchronously initiates radio connection request simultaneously.In addition, multimedia broadcast-multicast service (MultimediaBroadcastMulticastService, referred to as MBMS) terminal feedback business receiving status information time, if there is a large amount of terminals receive MBMS in a community, then in certain specific moment, these a large amount of terminals are triggered and initiate wireless access request to report its business accepting state simultaneously.
In above-mentioned application scenarios, on the one hand when a large amount of bursts appears in business, numerous terminals can be caused to select identical random access lead code (preamble) initiating random access procedure, cause the conflict (collision) of preamble, these Stochastic accessing having influence on ordinary terminal (H2H terminal) further that conflict.Because general subscriber terminal (H2H terminal) shares identical Physical Random Access Channel (PhysicalRandomAccessChannel with the terminal of above-mentioned M2M terminal and MBMS uplink feedback business, referred to as PRACH) resource, therefore, when selecting identical preamble initiating random access procedure from the terminal of many M2M terminal or MBMS uplink feedback business, the Stochastic accessing success rate of general subscriber terminal will decline, thus cause the time delay of Stochastic accessing to increase.On the other hand, these a large amount of burst Stochastic accessing can produce interference to general subscriber terminal simultaneously, preamble due to Stochastic accessing is sent as the feature of code division multiple access, when multiple terminal uses same preamble to send random access request, noise jamming (intersymbol interference) can be produced to the preamble that no conflict occurred, reduce the performance of base station decodes preamble.
In the related, in order to solve the problem, mainly contain two kinds of solutions, the terminal of one above-mentioned M2M terminal or MBMS uplink feedback business is distribute special preamble code, and the terminal of its two above-mentioned M2M terminal or MBMS uplink feedback business is special PRACH channel.
Wherein, the basic ideas of distributing dedicated preamble code plan are: in the PRACH channel of existing community, divide special preamble code and use to above-mentioned M2M or MBMS uplink service feedback.In this case, in the identical time domain in same PRACH channel, frequency domain resource, be assigned as M2M or the special preamble code of MBMS, and the preamble code that general subscriber terminal uses.That is, the terminal of general subscriber terminal and M2M terminal or MBMS uplink feedback business shares time domain and frequency domain, is separated by code domain.In this case, the PRACH channel shared can be called shared PRACH channel.The scene that, random access request less for service traffics is few, adopts this project plan comparison to be applicable to.But (1) is reduce impact on H2H terminal use when adopting this scheme, community is unlikely the too much preamble of M2M business or MBMS uplink feedback traffic assignments; (2) if there is the burst of M2M business or MBMS uplink feedback business, the terminal of a large amount of M2M terminals or MBMS uplink feedback business ties up in several dedicated preamble of distributing, cause larger random access collision, and bring the preamble code of the terminal of M2M terminal or MBMS uplink feedback business to the intersymbol interference of the preamble code of H2H terminal thus; (3) if when needing the preamble being adjusted to M2M business or MBMS uplink feedback traffic assignments because of the change of M2M service traffics, the change of existing PRACH configuration information will be caused, cause the renewal of System information block 2 (SIB2) thus, and the renewal of SIB2 will trigger domestic consumer's renewal system message.
And the basic ideas of distributing special PRACH channel approach are: on the PRACH basis of existing cell configuration, increase new PRACH channel resource again, this PRACH channel (can be called special PRACH channel) is exclusively used in the business that M2M or MBMS etc. are different from general subscriber terminal.This special PRACH channel approach is applicable to the scene that service traffics are larger, a large amount of burst appears in random access request.In such a scenario, special PRACH channel can provide more random access resource, and due to the completely isolated Stochastic accessing of M2M, MBMS and ordinary terminal business, thus Stochastic accessing that a large amount of M2M and MBMS produce can be avoided the impact of ordinary terminal business and interference.But, adopt this scheme, due to when M2M or MBMS flow less do not need special PRACH channel, otherwise will the waste of resource be caused, such as, in existing LTE protocol, the smallest allocation number of resources of PRACH channel is that every 20 wireless sub-frames distribute a PRACHOccasion, takies 6 PRB (Physical Resource Block), if M2M service traffics are very little, for M2M business separate configurations PRACH resource will cause the wasting of resources, reduce the utilance of resource.
Summary of the invention
Main purpose of the present invention is to provide a kind of accidental access method and system, at least one of to solve the problem.
According to an aspect of the present invention, provide a kind of accidental access method, comprise: wireless access network element adopts system message or beep-page message to be designated as to the terminal of intended service the random access resource that intended service distributes, wherein, to comprise in shared PRACH special leads preamble code and/or special PRACH for this random access resource, and the configuration information of this special PRACH indicates respectively from the configuration information of this shared PRACH in different system messages or beep-page message; The terminal of intended service uses this random access resource to carry out Stochastic accessing.
According to a further aspect in the invention, provide a kind of random access system, comprise: wireless access network element, be designated as to the terminal of intended service the random access resource that intended service distributes for adopting system message or beep-page message, wherein, this random access resource comprises dedicated preamble code in shared PRACH and/or special PRACH, and the configuration information of this special PRACH indicates respectively from the configuration information of this shared PRACH in different system messages or beep-page message; The terminal of intended service, carries out Stochastic accessing for using this random access resource.
Pass through the present invention, wireless access network element is that the random access resource that intended service distributes can comprise dedicated preamble code in shared PRACH channel and/or special PRACH, thus make network can according to the flow of intended service, distribute suitable random access resource, avoid intended service flow larger time random access collision and intersymbol interference, improve the utilance of resource simultaneously.Simultaneously, by above-mentioned two kinds of random access resources are indicated respectively, wireless access network element can be avoided when configure dedicated PRACH channel to have influence on the configuration of shared PRACH channel, thus avoid because the business demand of intended service causes the impact on other general service terminals.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of the random access system according to the embodiment of the present invention one;
Fig. 2 is the flow chart of the accidental access method according to the embodiment of the present invention two;
Fig. 3 is the time-domain resource configuration schematic diagram of PRACH channel in LTE system;
Fig. 4 is the frequency domain resource configuration schematic diagram of PRACH channel in LTE system;
Fig. 5 is the configuration schematic diagram of many PRACH channel in LTETDD;
Fig. 6 is a kind of different time-domain resource of PRACH channel and the configuration schematic diagram of frequency domain resource in the embodiment of the present invention two;
Fig. 7 is the another kind of different time-domain resource of PRACH channel and the configuration schematic diagram of frequency domain resource in the embodiment of the present invention two;
Fig. 8 is another the different time-domain resource of PRACH channel and configuration schematic diagram of frequency domain resource in the embodiment of the present invention two.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Embodiment one
Fig. 1 is the structural representation of the random access system according to the embodiment of the present invention one, and this system comprises: the terminal 20 of wireless access network element (such as, base station) 10 and the business of execution.Wherein, access network element 10, be designated as to the terminal 20 of intended service the random access resource that this intended service distributes for adopting system message or beep-page message, wherein, this random access resource comprises dedicated preamble code in shared PRACH and/or special PRACH, and the configuration information of described special PRACH indicates respectively from the configuration information of described shared PRACH in different system messages or beep-page message; Terminal 20, carries out Stochastic accessing for using above-mentioned random access resource.
Such as, above-mentioned intended service can be M2M business or MBMS.
In actual applications, wireless access network element 10 can be the random access resource of one of below intended service distribution according to the flow of intended service: the one or more dedicated preamble codes in one or more dedicated preamble codes, above-mentioned special PRACH and above-mentioned shared PRACH in above-mentioned special PRACH, above-mentioned shared PRACH (can be, also can be many).
In correlation technique, a kind of scheme is wireless access network element 10 is intended service distribution dedicated preamble code, another kind of scheme be wireless access network element 10 for intended service distributes special PRACH, front a kind of scheme is when the flow of this intended service is very large, to cause a large amount of random access collisions and intersymbol interference, and then cause access delay, then a kind of scheme is owing to being the special PRACH of traffic assignments, but the flow of intended service is not too large in the ordinary course of things, thus the waste of resource will be caused.And in the said system that the embodiment of the present invention provides, wireless access network element 10 can distribute for intended service the part dedicated preamble and/or special PRACH sharing PRACH, thus make wireless access network element 10 can according to the assignment of traffic random access resource of intended service, dedicated preamble code is distributed when the flow of intended service is less, special PRACH is distributed when flow is larger, or the special Preamble code resource simultaneously in the PRACH of configure dedicated and shared PRACH channel, thus can random access collision be reduced, also can avoid the waste of resource simultaneously.And, by above-mentioned two kinds of random access resources (namely sharing PRACH and special PRACH) are indicated respectively, wireless access network element 10 can be avoided when configure dedicated PRACH channel to have influence on the configuration of shared PRACH channel, thus avoid because the business demand of intended service causes the impact on other general service terminals.
Preferably, wireless access network element 10 also for according to the uninterrupted of this intended service be this intended service terminal distribution below one of random access channel resource: the one or more dedicated preamble codes in the one or more dedicated preamble codes in above-mentioned special PRACH, above-mentioned shared PRACH, above-mentioned special PRACH and above-mentioned shared PRACH.
Preferably, wireless access network element 10 shares the dedicated preamble code in PRACH channel for one of in the following manner instruction: (1) indicating predetermined business uses the numbering of the dedicated preamble code in above-mentioned shared PRACH; (2) indicating predetermined business uses the quantity of the dedicated preamble code from predetermined number in above-mentioned shared PRACH; (3) quantity of dedicated preamble code in the above-mentioned shared PRACH of indicating predetermined business use and the numbering of first dedicated preamble code.
Embodiment two
Fig. 2 is the flow chart of the accidental access method according to the embodiment of the present invention two, and the method mainly comprises the following steps (step S202-step S204):
Step S202, wireless access network element adopts system message or beep-page message to be designated as to the terminal of intended service the random access resource that this intended service distributes, wherein, this random access resource comprises dedicated preamble code in shared PRACH and/or special PRACH, and the configuration information of described special PRACH indicates respectively from the configuration information of described shared PRACH in different system messages or beep-page message;
Such as, the intended service in the embodiment of the present invention can be M2M business or MBMS uplink feedback business.
In actual applications, wireless access network element can according to the flow of intended service for this intended service distributes random access resource, preferably, before indicating above-mentioned random access resource to terminal, wireless access network element is first for this intended service distributes random access resource.Particularly, wireless access network element judges whether the flow of intended service is greater than threshold value, if, then for this intended service distributes the random access resource comprising special PRACH, otherwise, comprise for this intended service distributes the random access resource that one or more shares one or more dedicated preamble codes of PRACH;
In embodiments of the present invention, wireless access network element is this business configuration random access resource according to the flow of business.Preferably, access network element is that the random access resource that this intended service distributes can be divided into two parts: Part I is the part resource in the Random Access Channel shared with other business, Part II is the special accidental channel resource (i.e. special PRACH) of this intended service, and, Part II configures dynamically along with the demand of this intended service, and the least possible change of Part I is to avoid having influence on other business.Namely first part resource is not having the needs under service traffics emergency case for meeting this intended service, and Part II resource exists the needs under service traffics emergency case for meeting this intended service.
Preferably, under normal circumstances, wireless access network element adopts dedicated preamble mode to configure the random access resource of this intended service, namely wireless access network element is one or more dedicated preamble codes that this intended service distributes that one or more shares PRACH, to meet access demand when not happening suddenly intended service.
Wireless access network element detect or be instructed to this intended service flow exceed threshold value time (having a large amount of burst), wireless access network element is the special PRACH channel resource of this business configuration, with the access demand of the intended service of satisfied burst.In this case, the terminal performing this intended service can use dedicated preamble and/or special PRACH channel resource to carry out Stochastic accessing.
In embodiments of the present invention, wireless access network element is after above-mentioned traffic assignments random access resource, by the configuration by system message or this random access resource of beep-page message indicating terminal, preferably, for the configuration information of above-mentioned shared PRACH channel and special PRACH channel, wireless access network element adopts different System information blocks or beep-page message to be indicated to terminal respectively.Like this, when wireless access network element configure dedicated PRACH resource, do not need to change the System information block that PRACH channel is shared in configuration, thus can avoid affecting other service terminal because of the changes in flow rate of this intended service.
It should be noted that, above-mentioned shared PRACH channel configuration can not comprise the information of the dedicated preamble that concrete indicating predetermined business uses.That is, share PRACH channel configuration information and indicate the information of the special preamble code of described intended service can be carried on different System information blocks or be indicated by beep-page message.
Preferably, the configuration information of special PRACH channel can be carried on the System information block (SIB-x) of this service-specific.The configuration information of special PRACH channel comprises and is not limited to: the preamble code configuration information of the time-domain resource information of this PRACH channel, frequency domain resource information and/or this PRACH information.
Fig. 3 is PRACH time-domain resource configuration schematic diagram, and as shown in Figure 3, wireless access network element can configure one or more wireless sub-frames carrying PRACH channel in every 10 or 20 wireless sub-frames, and determines its concrete wireless sub-frame position.
Fig. 4 is PRACH frequency domain configuration schematic diagram, as shown in Figure 4, the frequency domain position of PRACH channel in a wireless sub-frame is determined by configuration PRACH frequency offset (Freq-Offset), particularly, this deviant represents the position of the physical resource fast (PRB) of carrying PRACH channel.
Further, in LTE TDD system, in same time-domain resource, multiple PRACH channel can be distributed, as shown in Figure 5, occupy different frequency domain resource blocks respectively, concrete PRACH number same by indicating in above-mentioned PRACH configuration information.Different PRACH channel f_id in same time domain carry out sign difference, and such as, in the LTETDDPRACH configuration example shown in Fig. 5, the f_id of PRACH channel 1 is the f_id of 0, PRACH channel 2 is 1.
Preferably, the configuration information of dedicated preamble code can be indicated by the system information block (SIB-y) of this service-specific.
In actual applications, the method for wireless access network element instruction dedicated preamble code includes but not limited to one of following:
(1) this intended service is indicated to use the numbering (Index) of the preamble code shared in PRACH channel;
Such as, in LTE system, what the preamble code indicating this intended service (such as, M2M business) to use in SIB-y was the shared PRACH channel that configures in SIB-2 is numbered 0,1, No. 2 preamble code.Wherein the PRACH channel of SIB-2 configuration is perform the terminal (such as, M2M terminal) of this business and the shared random access resource of other terminal (such as, H2H terminal).
(2) this intended service is indicated to use the number N of the preamble code shared in PRACH channel, in this case, to be the dedicated preamble code of this traffic assignments be wireless access network element: the N number of preamble code from the preamble arranged with terminal numbers;
Such as, in LTE system, 10 preamble in the shared PRACH channel that the preamble code indicating M2M business to use in SIB-y configures for SIB-2, these 10 preamble codes arrange 10 preamble codes " dedicatedpreamble " defined from first or last SIB-2.
(3) indicate this intended service to use the numbering of number N and first premble of the preamble code shared in PRACH channel, the dedicated preamble code now distributed is: the N number of preamble code from first preamble code numbering.
Such as, in LTE system, the preamble code indicating M2M business to use in SIB-y is 10 preamble in the shared PRACH channel that configures in SIB-2, and in Sib-y, indicate these 10 peramble codes from appointment preamble is numbered the preamble of 0.
Preferably, in above-mentioned dedicated preamble indicating means, if share PRACH channel to be many, then many shared PRACH channels can have identical or different dedicated preamble to distribute.If the dedicated preamble that different shared PRACH distributes is different, then on SIB-y, indicate the dedicated preamble assignment information on each shared PRACH respectively.
Such as, in LTETDD, cell configuration N bar PRACH channel, every bar PRACH channel is M2M service terminal and H2H service terminal is shared, and the preamble of the identical M2M service-specific of every bar PRACH channel configuration.On SIB-y, then only need the common configuration indicating preamble.
Again such as, in LTETDD, cell configuration N bar PRACH channel.Every bar PRACH channel has different M2M and H2H business configuration sharings respectively, then, in SIB-2, point other M2M service-specific preamble indicating every bar to share PRACH channel configures.
Preferably, in embodiments of the present invention, wireless access network element be this traffic assignments many shared PRACH channels between or between many special PRACH channels or one or more share time-domain resource between PRACH channel and one or more special PRACH channel and frequency domain resource configuration relation and comprise one of following or its combination in any:
(1) different PRACH channel configuration is identical time-domain resource, different frequency domain resource.Now many PRACH are overlapping in time domain, but configure different frequency domain resource respectively.
Such as, as shown in Figure 6, in LTE system, the time-domain resource of PRACH-1 is first wireless sub-frame of each radio frames, and its frequency domain resource is that in the frequency range of community, frequency shift (FS) is 6 PRB of 0 beginning.The time-domain resource of PRACH-2 is similarly first wireless sub-frame of each radio frames, 6 PRB of its frequency domain resource to be frequency shift (FS) be 12 beginnings.Like this by different frequency shift (FS)s, the time-domain resource of PRACH-1 with PRACH-2 can be identical.
(2) different PRACH channel configures different time-domain resource, identical or different frequency domain resource respectively.
Such as, as shown in Figure 7, in LTE system, the time-domain resource of PRACH-1 is first wireless sub-frame of each radio frames, and its frequency domain resource is that in the frequency range of community, frequency shift (FS) is 6 PRB of 0 beginning.The time-domain resource of PRACH-2 is the 4th wireless sub-frame of each radio frames, and its frequency domain resource is frequency shift (FS) is 0 or 12 6 PRB started.Like this, because the time-domain resource of PRACH-1 with PRACH-2 is different, its frequency resource can be identical or different.
(3) time-domain resource that different PRACH channel configuration part is identical, at least in the time-domain resource that part is identical, the frequency domain resource that different PRACH channel configurations is different.
Such as, as shown in Figure 8, in LTE system, PRACH-1 is configured in first wireless sub-frame of each radio frames, PRACH-2 is configured in first and the 4th wireless sub-frame of each radio frames, then PRACH-1 and PRACH-2 is overlapping first wireless sub-frame place time-domain resource.Simultaneously, PRACH-1 and PRACH-2 is configured with different frequency domain resource respectively, such as, PRACH-1 frequency domain resource in this example is configured on 6 PRB that frequency shift (FS) in the frequency range of community is 0 beginning, and the frequency domain resource of PRACH-2 is configured on 6 PRB that frequency offset in the frequency range of community is 6 beginnings.
Preferably, in embodiments of the present invention, in order to avoid wireless access network element be this intended service distribute accidental access response receiver window (ra-ResponseWindow) corresponding to special PRACH channel and shared PRACH channel exist occur simultaneously time, occur random access radio network temporary mark (RA-RNTI) conflict, the RA-RNTI defining special PRACH channel is in embodiments of the present invention not identical with the RA-RNTI of shared PRACH channel.
Such as, to LTE, if access network element is this business configuration one or more special PRACH channel, then the RA-RNTI of special PRACH channel can obtain according to the following formula:
RA-RNTI＝N+t_id+10*f_id....(2)；
Wherein, t_id is first radio sub frame number of PRACH channel (opportunity), and f_id is the numbering of the PRACH in LTETDD in same time domain in different frequency domain resource.
Wherein, N is more than or equal to 61, the N that different PRACH channels is corresponding different.Optionally, N=61+j*60, wherein, j is the numbering of special PRACH, and j is more than or equal to 0.
Such as, in LTEFDD, configure two special PRACH channels, be numbered PRACH0 and PRACH1 respectively, then in the RA-RNTI computing formula of PRACH0, corresponding N is N corresponding to the RN-RNTI computing formula of 61, PRACH-2 is 121.By that analogy.
Such as, in LTETDD, configure one group of special PRACH channel, the time-domain resource of this group special PRACH channel is identical and frequency domain resource is different, now, the RA-RNTI that this group special PRACH channel is corresponding calculates by (2) formula, and, N is preferably chosen as 61, and in (2), f_id is the numbering of PRACH in this group PRACH.
Step S204, the terminal of above-mentioned intended service uses above-mentioned random access resource to carry out Stochastic accessing.
In actual applications, the random access resource that this terminal selects it to use from above-mentioned random access resource, then uses the random access resource of selection to carry out Stochastic accessing.
Such as, according to different resource distributions, the terminal (such as, M2M terminal) of this intended service in accordance with the following methods one or a combination set of can select random access resource:
(1) wireless access network element shares PRACH channel for this intended service is configured with one or more, and each bar shares the identical time-domain resource of PRACH channel configuration and different frequency domain resource.Selection premable code that then this terminal is random in the dedicated preamble of shared PRACH channel configuration is as the lead code of Stochastic accessing.
Such as, terminal can the dedicated preamble of one of in accordance with the following methods Stochastic choice: first Stochastic choice shared PRACH, then from the dedicated preamble code of the shared PRACH configuration selected, selects a lead code as Stochastic accessing; Using the dedicated preamble code in shared PRACH channel as an optional preamble set, terminal selects a preamble code as the lead code of Stochastic accessing from this optional preamble code set.
Such as, cell configuration has 3 time-domain resource identical, and the shared PRACH channel that frequency domain is different, every bar PRACH channel is configured with M2M dedicated preamble code that is identical or varying number.M2M terminal (ME), when Stochastic accessing initiated by needs, in the PRACH time-domain resource that it is selected, first can be selected a PRACH channel, then select in the M2M dedicated preamble code on this PRACH channel.Or ME can by Stochastic choice wherein uniform in all preamble codes that above-mentioned 3 PRACH channels configure.
(2) wireless access network element is assigned one or more special PRACH channel for this intended service, and the identical time-domain resource of each bar special PRACH channel configuration and different frequency domain resource.Selection premable code that then terminal of this intended service is random in the preamble code of the special PRACH channel configuration distributed is as the lead code of Stochastic accessing.
Such as, the method for Stochastic choice can include but not limited to: 1) the first above-mentioned special PRACH of Stochastic choice one, then from preamble code of its configuration, selects a lead code as Stochastic accessing; 2) gathered as an optional preamble by the preamble code in above-mentioned each bar special PRACH channel, terminal selects a preamble code as the lead code of Stochastic accessing from this optional preamble code set.
Such as, cell configuration has 3 time-domain resource identical, and the M2M service-specific PRACH channel that frequency domain is different.Every bar PRACH channel is configured with M2M dedicated preamble code that is identical or varying number.ME, when Stochastic accessing initiated by needs, in the PRACH time-domain resource that it is selected, first can select a PRACH channel, then select on this PRACH channel in preamble code.Or ME can by Stochastic choice wherein uniform in all preamble codes that above-mentioned 3 PRACH channels configure.
(3) wireless access network element shares PRACH channel for this intended service is configured with one or more, be configured with one or more special PRACH channel, and these PRACH channel configurations has identical time domain, different frequency domain resource simultaneously.Then perform the lead code of the terminal of this business selection preamble code random in the dedicated preamble of above-mentioned shared PRACH information configuration and the preamble code of special PRACH channel configuration as Stochastic accessing.
Such as, terminal can Stochastic choice preamble in accordance with the following methods: first select a PRACH channel (can be the shared PRACH channel of access network element distribution, the special PRACH channel that also can distribute for access network element), the number of the preamble code selecting the probability of specific PRACH channel to use to the specific transactions of its configuration is directly proportional, the dedicated preamble code of then random on the PRACH channel selected selection this business.Or, using all preamble of this service-specific of above-mentioned special PRACH channel and above-mentioned shared PRACH channel configuration as the set of an optional preamble code, terminal from this reliable preamble code Stochastic choice preamble code as the lead code of Stochastic accessing.
Such as, access network element is that terminal distribution has a shared PRACH channel, and being wherein configured with 10 preamble codes is M2M service-specific.And be separately assigned with a special PRACH channel, this special PRACH channel configuration has 64 M2M business preamble codes.ME, when initiating Stochastic accessing, in the time-domain resource of PRACH channel, first selects a PRACH channel, wherein selects the probability sharing PRACH channel to be in a ratio of 10: 64 with selecting special PRACH channel probability.Then from selection Preamble code that selected PRACH channel is random.Or 64 preamble codes in 10 preamble codes of above-mentioned shared PRACH channel and special PRACH channel are gathered as an optional preamble by ME, and random therefrom selection preamble code.
(4) wireless access network element is assigned one or more shared PRACH channel for this is predetermined, and is configured with one or more special PRACH channel.Wherein each PRACH channel configuration has different time domains, frequency domain resource.
Then terminal selects the method for accidental channel resource to comprise:
1) terminal first choice for use share PRACH resource or special PRACH resource, namely first select the type of PRACH channel.After have selected PRACH channel type, select the nearest time-domain resource being configured with the PRACH type that have selected, again according to the configuring condition of PRACH channel in this time-domain resource, carry out selection PRACH channel and preamble code according to the method for above-mentioned (1) or (2) respectively.
Such as, that selects PRACH type can as follows: the different PRACH selecting or be indicated to according to base station terminal according to the ratio that can be used for the number of resources of this business of the dissimilar PRACH channel distributed are by the probability selected or the PRACH according to the instruction of base station or the preferential selection particular type of protocol conventions.
2) first terminal selects the opportunity of initiating Stochastic accessing according to nearby principle, that is, terminal is when Stochastic accessing initiated by needs, select the nearest time-domain resource being assigned shared PRACH or special PRACH channel, again according to the configuring condition of PRACH channel in this time-domain resource, respectively according to way selection PRACH channel and the Preamble code of above-mentioned (1) or (2) or (3).
Such as, be configured with a shared PRACH-1 channel in community, wherein 10 Preamble codes are appointed as the use of M2M service terminal, are separately configured with a special PRACH-2, are configured with 64 preamble.The wireless sub-frame 2 of the time-domain resource of PRACH-1 to be the time-domain resource of the wireless sub-frame 1, PRACH-2 of odd and even number radio frames be even number radio frames.Then, PRACH-1 and PRACH-2 channel can be used for the preamble number ratio of M2M business is 20: 64 (being configured with the preamble of 20 shared PRACH in every 2 radio frames, 64 special PRACHpreamble).
ME the first-selected ratio according to 20: 64 can select PRACH channel type, and namely the probability selection of 20/84 shares PRACH, the probability selection dedicated channel of 64/84.Then ME selects the wireless sub-frame that have selected the PRACH of type from nearest being configured with of current time, this wireless sub-frame is selected again the preamble of described PRACH initiate Stochastic accessing.
In embodiments of the present invention, PRACH channel type selection percentage ME can calculate according to described PRACH channel configuration, or base station is indicated to ME by signaling.
3) terminal can according to wireless access network element instruction or in advance with the agreement of wireless access network element, the special PRACH channel of prioritizing selection.
4) terminal can, according to nearest selection, namely select the wireless sub-frame being configured with PRACH channel resource from current time is nearest to initiate Stochastic accessing.
It should be noted that, the Stochastic choice of above-mentioned PRACH channel or preamble code, need to ensure that optional PRACH or preamble code has identical by the probability selected.
And, the preamble of above-mentioned PRACH channel does not comprise the preamble code for reserving based on non-competing Stochastic accessing, wherein, refer to based on non-competing Stochastic accessing: base station be terminal distribution preamble code for Stochastic accessing, this preamble can not be terminal choice for use voluntarily.
In correlation technique, a kind of scheme is wireless access network element is that intended service distributes dedicated preamble code, another kind of scheme is wireless access network element is that intended service distributes special PRACH, front a kind of scheme is when the flow of this intended service is very large, to cause a large amount of random access collisions and intersymbol interference, and then cause access delay, then a kind of scheme is owing to being the special PRACH of traffic assignments, but the flow of intended service is not too large in the ordinary course of things, thus the waste of resource will be caused.And in the said method that the embodiment of the present invention provides, wireless access network element is that the random access resource that intended service distributes comprises the part dedicated preamble code of shared PRACH and/or special PRACH, make wireless access network element can according to the assignment of traffic random access resource of intended service, dedicated preamble code is distributed when the flow of business is less, special PRACH is distributed when flow is larger, thus can random access collision be reduced, also can avoid the waste of resource simultaneously.And, above-mentioned two kinds of random access resources are indicated respectively, wireless access network element can be avoided when configure dedicated PRACH channel to have influence on the configuration of shared PRACH channel, thus avoid because the business demand of intended service causes the impact on other general service terminals.
From above description, in embodiments of the present invention, net wireless access network element is that the random access resource that intended service distributes can comprise dedicated preamble code in shared PRACH channel and/or special PRACH, thus make network can according to the flow of intended service, distribute suitable random access resource, avoid intended service flow larger time random access collision and intersymbol interference, improve the utilance of resource simultaneously.Simultaneously, by above-mentioned two kinds of random access resources are indicated respectively, wireless access network element can be avoided when configure dedicated PRACH channel to have influence on the configuration of shared PRACH channel, thus avoid because the business demand of intended service causes the impact on other general service terminals.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an accidental access method, is characterized in that, comprising:
Wireless access network element adopts system message or beep-page message to be designated as to the terminal of intended service the random access resource that described intended service distributes, wherein, described random access resource comprises special random access preamble preamble code in shared Physical Random Access Channel PRACH and/or special PRACH, and the configuration information of described special PRACH indicates respectively from the configuration information of described shared PRACH in different system messages or beep-page message;
The terminal of described intended service uses described random access resource to carry out Stochastic accessing;
Wherein, before described wireless access network element indicates described random access resource, described method also comprises:
Described wireless access network element is the random access channel resource of one of below the terminal distribution of described intended service according to the uninterrupted of described intended service: the one or more described dedicated preamble code in the one or more described dedicated preamble code in described special PRACH, described shared PRACH, described special PRACH and described shared PRACH.
2. method according to claim 1, is characterized in that, described wireless access network element indicates described random access resource to comprise to described terminal:
The configuration information of described special PRACH is carried in the special the first system message blocks of described intended service and sends to described terminal by described wireless access network element;
The configuration information of described shared PRACH channel is carried in second system message blocks and sends to described terminal by described wireless access network element.
3. method according to claim 1, is characterized in that, the described dedicated preamble code of described wireless access network element one of in the following manner in the described shared PRACH channel of instruction:
Described intended service is indicated to use the numbering of the dedicated preamble code in described shared PRACH;
Described intended service is indicated to use the quantity of the dedicated preamble code from predetermined number in described shared PRACH;
Indicate the quantity of dedicated preamble code in the described shared PRACH of described intended service use and the numbering of first dedicated preamble code.
4. method according to claim 1, is characterized in that, described random access resource comprises the one or more described dedicated preamble code of many described shared PRACH, and described in each bar, shared PRACH has the time-domain resource of phase and different frequency domain resource;
Described terminal uses described random access resource to carry out Stochastic accessing to comprise: described terminal Stochastic choice dedicated preamble code in one or more dedicated preamble codes of many described shared PRACH carries out Stochastic accessing as the lead code of Stochastic accessing.
5. method according to claim 1, is characterized in that, described random access resource comprises one or more special PRACH, and special PRACH described in each bar has identical time-domain resource and different frequency domain resource;
Described terminal uses described random access resource to carry out Stochastic accessing to comprise: described terminal Stochastic choice preamble code in one or more preamble codes of many described special PRACH carries out Stochastic accessing as the lead code of Stochastic accessing.
6. method according to claim 1, it is characterized in that, described random access resource comprise share PRACH described in one or more one or more described dedicated preamble code and one or more described in special PRACH, and share each bar PRACH in special PRACH described in PRACH and one or more described in one or more there is identical time-domain resource and different frequency domain resource;
Described terminal uses described random access resource to carry out Stochastic accessing to comprise: described terminal Stochastic choice preamble code in the one or more preamble codes sharing special PRACH described in the one or more described dedicated preamble code and one or more of PRACH described in one or more carries out Stochastic accessing as the lead code of Stochastic accessing.
7. method according to claim 1, it is characterized in that, described random access resource comprises the one or more described dedicated preamble code and one or more special PRACH of sharing PRACH described in one or more, and in shared PRACH and one or more special PRACH described in one or more, each bar PRACH has different time-domain resource and different frequency domain resource;
Described terminal uses the described random access resource distributed to carry out Stochastic accessing to comprise: the resource that described terminal one of in such a way selects Stochastic accessing to use from the described random access resource distributed, and uses the described resource of selection to carry out Stochastic accessing:
Described terminal selects PRACH type, then from described random access resource, selects the nearest time-domain resource with the described PRACH type matching selected, Stochastic choice preamble code from the PRACH of the described PRACH type described time-domain resource;
Described terminal is when Stochastic accessing initiated by needs, nearest time-domain resource is selected from described random access resource, then from the described shared PRACH of Stochastic choice described time-domain resource one or described special PRACH, then from select described shared PRACH or described special PRACH preamble code Stochastic choice preamble code;
Described terminal according to described wireless access network element instruction or in advance with the agreement of described wireless access network element, select a described special PRACH, then from one or more preamble codes of described special PRACH Stochastic choice preamble code;
Described terminal is selected from the nearest wireless sub-frame being configured with the described random access resource of distribution of current time.
8. method according to claim 1, is characterized in that, the random access radio network temporary mark of described special PRACH from described shared PRACH random access radio network temporary mark different.
9. a random access system, is characterized in that, comprising:
Wireless access network element, be designated as to the terminal of intended service the random access resource that described intended service distributes for adopting system message or beep-page message, wherein, described random access resource comprises dedicated preamble code in shared PRACH and/or special PRACH, and the configuration information of described special PRACH indicates respectively from the configuration information of described shared PRACH in different system messages or beep-page message;
The terminal of described intended service, carries out Stochastic accessing for using described random access resource;
Wherein, described wireless access network element also for according to the uninterrupted of described intended service be described intended service terminal distribution below one of random access channel resource: the one or more described dedicated preamble code in the one or more described dedicated preamble code in described special PRACH, described shared PRACH, described special PRACH and described shared PRACH.
10. system according to claim 9, is characterized in that, described wireless access network element is used for the described dedicated preamble code in one of the in the following manner described shared PRACH channel of instruction:
Described intended service is indicated to use the numbering of the dedicated preamble code in described shared PRACH;
Described intended service is indicated to use the quantity of the dedicated preamble code from predetermined number in described shared PRACH;
Indicate the quantity of dedicated preamble code in the described shared PRACH of described intended service use and the numbering of first dedicated preamble code.
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| PCT/CN2011/075489 WO2011160547A1 (en) | 2010-06-21 | 2011-06-08 | Random access method and system |
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| CN201010211755.8A CN102291845B (en) | 2010-06-21 | 2010-06-21 | Accidental access method and system |
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Families Citing this family (32)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102647801A (en) * | 2011-02-18 | 2012-08-22 | 华为技术有限公司 | Communication method and equipment on common control channel (CCCH) |
| CN103220811B (en) * | 2012-01-19 | 2018-04-27 | 中兴通讯股份有限公司 | The method of information processing method, MTC UE random access LTE systems |
| CN103220812B (en) * | 2012-01-20 | 2015-11-25 | 华为技术有限公司 | Determine the method for paging subframe, base station and subscriber equipment |
| CN104770029B (en) * | 2012-11-16 | 2019-03-05 | 华为技术有限公司 | Resource allocation methods, base station and D2D equipment |
| WO2014113925A1 (en) * | 2013-01-22 | 2014-07-31 | 华为技术有限公司 | Competitive random access method and apparatus |
| JP2015065603A (en) * | 2013-09-26 | 2015-04-09 | 株式会社Ｎｔｔドコモ | Radio communication terminal, radio base station and radio communication method |
| CN105530706B (en) * | 2014-10-23 | 2019-07-26 | 电信科学技术研究院 | A kind of method and apparatus transmitting downlink data |
| JP6644810B2 (en) * | 2015-04-24 | 2020-02-12 | ノキア テクノロジーズ オーユー | Cooperative random access based on common random access channel resources |
| EP3328149B1 (en) | 2015-08-28 | 2019-11-27 | Huawei Technologies Co., Ltd. | Method and device for uplink transmission in random access process |
| CN106487573B (en) | 2015-09-02 | 2020-01-10 | 华为技术有限公司 | Internet of things communication method, network side equipment and Internet of things terminal |
| CN106559885B (en) * | 2015-09-28 | 2021-12-03 | 中兴通讯股份有限公司 | Method for distributing cell wireless network temporary identifier, access network node and UE |
| CN108886811B (en) * | 2016-03-31 | 2020-10-09 | 华为技术有限公司 | Method, equipment and system for sending Physical Random Access Channel (PRACH) |
| EP3965486A1 (en) * | 2016-08-10 | 2022-03-09 | ZTE Corporation | Paging method, apparatus and system, and user equipment |
| WO2018053752A1 (en) * | 2016-09-22 | 2018-03-29 | 广东欧珀移动通信有限公司 | Method for transmitting system information, network device, and terminal device |
| CN107872884A (en) * | 2016-09-26 | 2018-04-03 | 电信科学技术研究院 | A kind of random access resource distribution and accidental access method, equipment |
| CN110381602B (en) * | 2016-11-04 | 2021-10-15 | 华为技术有限公司 | Communication method, network device, communication system, and computer-readable storage medium |
| CN109937586B (en) * | 2017-03-10 | 2022-08-26 | 上海朗帛通信技术有限公司 | Method and device used in user equipment and base station for wireless communication |
| US11153846B2 (en) * | 2017-04-04 | 2021-10-19 | Qualcomm Incorporated | Resource sharing between paging response and random access channel message |
| CN108882259B (en) | 2017-05-16 | 2020-10-27 | 维沃移动通信有限公司 | Random access method, terminal, source base station and target base station |
| BR112019025347A2 (en) * | 2017-08-28 | 2020-06-23 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | DATA TRANSMISSION METHOD, NETWORK DEVICE, AND TERMINAL DEVICE |
| AU2017441775A1 (en) * | 2017-12-01 | 2020-07-16 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Random access method and device and computer storage medium |
| WO2019178729A1 (en) * | 2018-03-19 | 2019-09-26 | 华为技术有限公司 | Random access method and apparatus |
| CN110557978B (en) * | 2018-04-04 | 2024-02-06 | 北京小米移动软件有限公司 | Uplink transmission method, device and storage medium |
| CN108901078B (en) * | 2018-07-05 | 2020-05-22 | 南方电网科学研究院有限责任公司 | Random access optimization method and device for power Internet of things service |
| CN110876162B (en) * | 2018-08-29 | 2023-05-19 | 中兴通讯股份有限公司 | Random access method and device for MTC (machine type communication) equipment |
| CN109314948A (en) * | 2018-09-04 | 2019-02-05 | 北京小米移动软件有限公司 | Transmit the method and device of lead code |
| CN111082906B (en) * | 2018-10-22 | 2022-04-26 | 成都鼎桥通信技术有限公司 | PRACH configuration method and equipment for special cell |
| CN111372241B (en) * | 2018-12-25 | 2021-08-03 | 华为技术有限公司 | Communication network access method and device |
| CN110495195B (en) * | 2019-07-02 | 2022-02-15 | 北京小米移动软件有限公司 | Random access method, device and storage medium |
| CN110800361B (en) * | 2019-09-26 | 2023-07-11 | 北京小米移动软件有限公司 | Random access opportunity configuration method, device and storage medium |
| CN111372288B (en) * | 2020-03-10 | 2023-04-18 | 北京意锐新创科技有限公司 | Preamble sequence transmission optimization method and device suitable for payment equipment |
| EP4387368A4 (en) * | 2021-08-12 | 2024-08-28 | Beijing Xiaomi Mobile Software Co Ltd | Resource allocation method and apparatus, and storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101282575A (en) * | 2007-04-02 | 2008-10-08 | 中兴通讯股份有限公司 | Random access method and system |
| CN101686544A (en) * | 2008-09-22 | 2010-03-31 | 中兴通讯股份有限公司 | Method for distributing special random access resource and base station |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101483919A (en) * | 2008-01-08 | 2009-07-15 | 华为技术有限公司 | Wireless resource allocation method used for stochastic access and base band equipment |
| WO2010060749A1 (en) * | 2008-11-03 | 2010-06-03 | Nokia Siemens Networks Oy | Random access preamble transmission design with multiple available random access channel resources |
| CN102056312A (en) * | 2009-10-29 | 2011-05-11 | 华为技术有限公司 | Resource management method and device for M2M communication |
-
2010
- 2010-06-21 CN CN201010211755.8A patent/CN102291845B/en not_active Expired - Fee Related
-
2011
- 2011-06-08 WO PCT/CN2011/075489 patent/WO2011160547A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101282575A (en) * | 2007-04-02 | 2008-10-08 | 中兴通讯股份有限公司 | Random access method and system |
| CN101686544A (en) * | 2008-09-22 | 2010-03-31 | 中兴通讯股份有限公司 | Method for distributing special random access resource and base station |
Non-Patent Citations (1)
| Title |
|---|
| 加入M2M业务的LTE系统的随机接入性能研究;刘茜;《中国科技论文在线》;20100525;第2-5页 * |
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