CN102378364B - Random access method and system realizing same - Google Patents
Random access method and system realizing same Download PDFInfo
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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
- H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
- H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance
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Abstract
The invention relates to a random access method and a system realizing the same. The random access method comprises the following steps that: a reference backspace time is previously configured in a machine-type-communication equipment (ME) or the reference backspace time is transmitted to the ME by a network side, and the network side transmits an adjustment factor to the ME; and the ME adopts the adjustment factor to adjust the reference backspace time to obtain a special backspace time, and a random access request is transmitted according to the special backspace time when the random access is restarted. A pre-configuration way or a network-side transmission way is adopted in the ME, so the ME acquires the reference backspace time, the adjustment factor is transmitted to the ME through a network-side transmission way, the ME adopts the adjustment factor to adjust the reference backspace time to obtain the special backspace time, so the ME and human-to-human (H2H) equipment can adopt different backspace times to restart the random access process, and the network congestion problem caused by identical backspace time adopted by the H2H equipment and the ME can be solved.
Description
Technical field
The present invention relates to communication technique field, relate in particular to a kind of accidental access method and realize the random system accessing.
Background technology
M2M (Machine to Machine, machine is to machine) is the concept proposing nineteen nineties, is the important driving force of development communication technologies.Briefly, M2M is exactly the Internet of machine, and the means of realization comprise various networking technologies.The target of M2M technology makes all machinery equipments all possess networking and communication capacity exactly, and its core concept is exactly network all (Network Everything).The communication object of M2M is that machine is to machine or Human-to-Machine.Data communication between one or more machines is defined as MTC (Machine Type Communication, machine type communication), lessly in this case needs human-computer interaction.The machine that participates in MTC, is defined as MTC terminal (MTC UE, ME).MTC terminal is MTC user's terminal, can communicate with other MTC terminals and MTC server by PLMN (public land mobile network).Fig. 1 is the MTC network configuration under LTE (Long Term Evolution) framework, as shown in Figure 1, MTC UE is by the terminal equipment of carrier network and the communication of MTC server, MTC contractor be one for MTC terminal provides the entity of business, comprise multiple MTC users.MTC user is connected with PLMN network by MTC server, and MTC server provides service for MTC user.
In Fig. 1, on LTE-Uu interface, chain of command agreement adopts RRC (Radio Resource control) layer protocol, and rrc layer is the core of EUTRAN (universal land radio access web) RRM, comprises the function such as system message and paging.System information (SI) is the RRC message that carrying has the system information block (SIB) of identical dispatching cycle, that is to say that SI is the transmission container of SIB.Each SIB comprises the system parameters that a set of content is relevant.SIB has polytype, mainly comprises MIB (host system message block), SIB1 and SIBn (n=1...11), and the information of carrying in these message blocks is different.
The process that UE (subscriber equipment) obtains system information as shown in Figure 2, if the content of system information changes, base station sends beep-page message to UE, and comprise that at beep-page message system information changes instruction (system Info Modification), so UE executive system acquisition of information flow process.The signaling procedure of base station calling UE as shown in Figure 3, when base station sends beep-page message to UE, sends P-RNTI (paging-Radio Network Temporary Identifier) at PDCCH (Physical Downlink Control Channel).UE reads after P-RNTI on PDCCH channel, the particular content of reading gating message on PDSCH.For MTC terminal, can increase a paging mark MTC_P_RNTI newly, in the time that common UE reads this mark, content that can reading gating message.
Random access is a most basic function of terminals in wireless communication systems, and it connects terminal and network becomes possibility.Just as its name, the initiation of this access and the resource of employing have randomness, access and successfully also have randomness.Have access at random two kinds of patterns: based on competitive mode with based on noncompetitive pattern.The flow process difference of the random access procedure of these two kinds of patterns, is applicable to different scenes.
Random access based on competitive mode is applicable to: the initial access under RRC_IDLE (radio link layer _ free time) state; The initial access that wireless losses is later; Under RRC_CONNECTED (radio link layer _ connection) state, transmitting uplink data.
Random access based on noncompetitive pattern is applicable to: under RRC_CONNECTED state, and downlink data transmission; The random access procedure of terminal in handoff procedure.
Fig. 4 is in prior art, based on the random access procedure of competitive mode, comprising:
401: subscriber equipment (UE) sends random access lead code to evolved base station (eNB);
UE is before initiating random access request, and from available random access send opportunity, a send opportunity of random selection is selected at random equiprobably a lead code and selected lead code is sent to base station from available lead code set.
402:eNB sends random access response message to UE;
ENB correctly solves after one or more lead code on certain random access send opportunity, calculates corresponding RA-RNTI (random access-Radio Network Temporary Identifier) according to send opportunity.According to above-mentioned Information generation, media Access Layer Packet Data Unit (RAR MACPDU) is replied in random access as shown in Figure 5, and as shown in Figure 5, the RAR field in son head and payload in MAC head is one to one.
In addition, eNB also can judge whether to add the sub-head of rollback (rollback, BO) in MAC PDU is replied in random access according to the load state of current random access, in rollback head, has carried the rollback time.Its effect is to make user not carry out lead code transmission in the available random access chance of the next one immediately in the time there is random access collision, but delays and resend lead code again in the time keeping out of the way through one section, thereby reduces the probability bumping between user.
The structure of rollback head as shown in Figure 6, field E is used for representing whether having after BI field the sub-head of E-T-RAPID form, field T is used for representing in the field after this field to be BI or RAPID, two field R represent two bits reserving, in the time that H2H (Human To Human's communication) type UE (R8 and R9 terminal) reads this two reserved fields, ignore the value of these two fields, BI field represents the selection range of UE random access backoff time.
403: terminal recognition, UE sends the RRC message with user ID to eNB;
If multiple UE have selected identical lead code to send at identical send opportunity in step 401, have multiple UE in step 402 so and receive identical random access response message, these UE have identical C-RNTI (Cell Radio Network Temporary Identifier/Identity, Cell-RNTI), in message 3 (RRC message), comprise can unique identification different UEs information.
404: competition is eliminated, eNB sends collision to UE and solves message.
Owing to may there be multiple UE to send the message 3 of oneself in same uplink authorization simultaneously, eNB therefrom correctly demodulates a message 3, on PDCCH, send message 4 (collision solves message), the PDCCH corresponding with message 4 (Physical Downlink Control Channel) content is carried out to scrambling with the C-RNTI of the UE comprising in message 3.UE adopts one's own C-RNTI to receive PDCCH, if can correctly receive PDCCH, thinks random access successfully.
In random access procedure, there are two kinds of situations can adopt fallback mechanism.It is abnormal that one is that random access is replied, if be exactly that UE does not receive the RAPID of its transmission in random access is replied specifically, or in certain time length, do not receive that random access replys.Another situation is as described in step 402 above, produces collision in UE random access procedure, and random access failure appears in some UE.
In addition, when in the situation of base station in overload, for example, the more resource that sends message 3 etc. of cannot reallocating, at this moment wish that some UE can postpone a period of time transmission RACH (access at random) request, can be in the time that the random access of reception be replied, realize by the rollback parameter in random access response message form, this rollback parameter is exactly the parameter of fallback mechanism, find that there is a rollback instruction if monitor the UE of random access response message, this rollback value will be saved so, in the time needing to re-start random access subsequently, can to rollback value, choose a value as postponing the time of sending out lead code from 0 randomly.In the prior art, the unit of rollback time parameter is millisecond, can be from selecting one 12 values below: 0,20,30,40,60,80,120,160,240,320,480 and 960.It is that base station is determined according to the load of machinery systems that base station sends to the rollback parameter of carrying in the random access response message of terminal, all adopts same rollback parameter for the terminal accessing in a Serving cell.
Terminal quantity in MTC network is numerous, and when great amount of terminals is initiated random access request while being linked into network simultaneously, the resource in network will be not enough, and access failure can occur a large amount of MTC equipment, therefore can access again within the rollback time.A large amount of MTC equipment is initiated random access request at short notice, also can cause the congested of network.
Such as, electricity meter-reading operation regulation MTC equipment send data in certain specific time to network, need these MTC equipment to be linked into network at special time simultaneously.In the time that a large amount of MTC equipment is linked into network simultaneously, the likelihood ratio that random access collision occurs is larger, and a large amount of MTC equipment there will be random access failure, and the MTC equipment of these random access failures also can be linked into network again.In a large amount of MTC equipment short time, to be linked into network and network to be caused to congestion condition, the rollback time that need to be longer in order to alleviate.MTC equipment selects a time to be again linked into network within the longer rollback time.But, in order not affect user's quality of service, if H2H terminal generation random access collision need to be linked into network conventionally as early as possible, need to reply the shorter rollback time of middle setting in random access.
On the other hand, in some application scenarios, when MTC equipment has time sensitivity, MTC equipment has the access priority higher than common UE, and now MTC equipment is wanted fast access into network, needs to obtain the rollback time less than H2H terminal.In the time that H2H terminal and MTC equipment are linked into network a Serving cell, can distinguishing terminal type and then sends the RAR MAC PDU of difference in base station.It is also identical that the rollback time of carrying in same RAR MAC PDU is replied in the random access sending for different terminals, and H2H terminal and MTC equipment cannot get the different rollback time.Therefore in prior art, cannot feed back the different random access backoff time for H2H terminal and MTC equipment, thereby cannot solve the network congestion that MTC equipment causes in random access procedure.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of accidental access method and realizes the system of random access, realizes MTC terminal and adopts the rollback time of again initiating random access different from H2H terminal, is linked into network.
For solving the problems of the technologies described above, a kind of accidental access method of the present invention, comprising:
Pre-configured benchmark rollback time or the benchmark rollback time is sent to ME by network side in machine type communication terminal (ME), and the adjustment factor is sent to ME by network side;
ME employing is adjusted the factor pair benchmark rollback time and is adjusted, and obtains the special rollback time, while again initiating random access, according to special rollback time transmission random access request.
Further, the rollback time that the basic rollback time adopts while again initiating to access at random for Human To Human's communication (H2H) terminal, or be a rollback time constant;
The basic rollback time, while being the rollback time of H2H terminal employing, sends to ME by network side; The basic rollback time, while being rollback time constant, being pre-configured in ME, or sending to ME by network side.
Further, network side is sent rollback time constant and adjusts the factor to ME by system message or beep-page message.
Further, the method also comprises:
Network side is for different machine type communication (MTC) grouping, service priority or access priority, configure the corresponding adjustment factor, by the adjustment factor corresponding to different groupings, service priority or access priority, send to corresponding ME by system message or beep-page message.
Further, the method also comprises:
Network side carries the identification information of grouping, service priority or access priority in system message or beep-page message, to send to corresponding ME.
Further, network side is according to service priority or access priority, for different MTC groupings, configures the corresponding adjustment factor, by the adjustment factor corresponding grouping, sends to the ME in grouping by system message or beep-page message.
Further, a kind of accidental access method, comprising:
Network side adopts the adjustment factor pair benchmark rollback time to adjust, and obtains the special rollback time, and the obtained special rollback time is sent to machine type communication terminal (ME);
When ME initiates to access at random again, according to special rollback time transmission random access request.
Further, network side is for different machine type communication (MTC) grouping, service priority or access priority, adopt the corresponding adjustment factor, the benchmark rollback time is adjusted, and by system message or beep-page message by the special rollback time obtaining, send to the ME under different groupings, service priority or access priority.
Further, a kind of system that realizes random access, comprising: base station and machine type communication terminal (ME), and base station inclusion information sending module, ME comprises access request module, wherein:
Information sending module, for sending to access request module by benchmark rollback time and the adjustment factor;
Access request module, adjusts factor pair and receives or the pre-configured benchmark rollback time is adjusted from information sending module for adopting, and obtains the special rollback time, while again initiating random access, sends random access request according to the special rollback time.
Further, the rollback time that the basic rollback time adopts while again initiating to access at random for Human To Human's communication (H2H) terminal, or be a rollback time constant;
Information sending module is sent rollback time constant and adjusts the factor to access request module by system message or beep-page message.
Further, a kind of system that realizes random access, comprising: base station and machine type communication terminal (ME), and base station inclusion information sending module, ME comprises access request module, wherein:
Information sending module, for adopting the adjustment factor pair benchmark rollback time to adjust, obtains the special rollback time, and the special rollback time obtaining is sent to access request module;
Access request module, when again initiating to access at random, sends random access request according to the special rollback time.
In sum, the present invention adopts mode pre-configured or that sent by network side in ME to make ME obtain the benchmark rollback time, and the adjustment factor is sent to ME by the mode being sent by network side, ME adopts the adjustment factor pair benchmark rollback time to adjust, obtain the special rollback time, make ME and H2H terminal can adopt differential rollback time initiating random access procedure again, solved H2H terminal and ME and adopted identical rollback time, the problem of the network congestion causing.
Brief description of the drawings
Fig. 1 is the MTC network architecture diagram based on LTE in prior art;
Fig. 2 is the flow chart that in prior art, in EUTRAN framework, system message is obtained;
Fig. 3 is the flow chart of paging in EUTRAN framework in prior art;
Fig. 4 is random access procedure flow chart in prior art;
Fig. 5 is the structural representation of random access response message MAC PDU in prior art;
Fig. 6 is the random schematic diagram that accesses backoff head in response message in prior art;
Fig. 7 is the flow chart of the example of present embodiment accidental access method;
Fig. 8 is the Organization Chart that present embodiment realizes the system of random access.
Embodiment
Consider in the time that ME is linked into network at random, there will be network congestion, in the time that ME need to access again, need to adopt the random access backoff time different from H2H terminal (ordinary terminal).In present embodiment, ME employing is adjusted the factor pair benchmark rollback time and is adjusted, and obtains the special rollback time, while again initiating random access, according to special rollback time transmission random access request.The rollback time adopting ordinary terminal can be initiated to access at random again time or default rollback time constant are as the benchmark rollback time.Network side carries the applicable rollback time of ordinary terminal in random access response message, and ME adjusts the rollback time of receiving in random access response message as the own special rollback time; Rollback time constant can be preset in ME, also can be default at network side (as base station), and adopt system message or beep-page message to notify ME by network side.And default rollback time constant can be an adjustable parameter, and network side can be adjusted this parameter according to the load of machinery systems.Adjust the factor and notify ME by network side by system message or beep-page message.
For the ME realizing in different MTC groupings adopts the different special rollback time, different service priority, different access priorities adopts the different special rollback time, can configure the corresponding adjustment factor for different MTC grouping, service priority or access priorities, by eating dishes without rice or wine for different MTC grouping, service priority or access priority, the corresponding factor of adjusting of ME corresponding to ME, access priority or service priority in system message or in beep-page message in notice packet.
For the MTC grouping that realizes different business priority or access priority adopts the different rollback time, can be according to service priority or access priority, for different MTC groupings, configure the corresponding adjustment factor, divided into groups by the MTC eating dishes without rice or wine for different business priority or access priority, in system message or in beep-page message, the notice ME adjustment factor corresponding with different business priority or access priority.
Adjusting the factor can be a scale parameter, and the operation that now ME carries out can be that the benchmark rollback time is done to multiply operation according to adjusting the factor.Adjusting the factor can be also a side-play amount, and now ME can do add operation according to side-play amount to the benchmark rollback time.
Moreover, base station also can adopt adjust the factor pair benchmark rollback time adjust, obtain the special rollback time, in system message or beep-page message by special rollback time announcement to ME.For MTC block terminal, corresponding special rollback time announcement can be divided into groups to ME by the MTC at its place in base station in system message or beep-page message.
ME in MT reconnaissance C grouping refers to: belong to the member's of certain group terminal according to signing or dynamic distribution group mark, now, this terminal has group identification (Group ID).
When network side will be adjusted the factor or special rollback time announcement to ME, can adopt existing system message (as SIB2), newly-increased system message or beep-page message.Adjust the factor or special rollback time and notify ME as a cell in message, be described as follows:
1) if network side completes transmission by existing SIB message, can adopt so as existing SIB2 system message, by system message modified flow in prior art, to adjust the factor or special rollback time announcement to ME, that is: first network side sends beep-page message notice ME system message variation has occurred, ME reads new system message, if adjusting the factor is for certain MTC grouping or service priority or access priority, need in SIB2 system message, carry so the identification information of MTC grouping or service priority or access priority, identification information is as a cell of SIB2 system message.
2) ME increases system message newly if, as is designated as SIB-m, is similar to the scheduling mode of SIB system message in prior art, and the schedule information (such as Transfer Window and transmission cycle) of newly-increased SIB message is configured in SIB1.In beep-page message, increasing an indication information is used to indicate SIB-m whether variation has occurred.If variation has occurred the content in SIB-m, base station sends beep-page message to ME, carries the indication information that SIB-m content changes in message.When ME has received after beep-page message, ordinary terminal is the content in receiving system message SIB-m not, only has ME to receive the content of newly-increased system message.For certain MTC grouping or Service Class or Access Class if adjust the factor, need in newly-increased SIB message, carry so MTC grouping or Service Class or Access Class identification information, these information are notified ME as a cell of SIB message.
3) if base station is directly sent the special rollback of the ME time or is adjusted the factor by beep-page message.If the rollback time is adjusted the factor for certain MTC grouping or service priority or access priority, need in beep-page message, carry so the identification information of MTC grouping or service priority or access priority, notify ME as a cell of beep-page message.
In the system message that network side (as base station) can send in the time powering on or beep-page message, carry the adjustment factor.Load in running in base station while changing, base station also needs to adjust the size of the adjustment factor adopting in MTC terminal random access backoff process, and in the time that adjustment factor size changes, base station sends beep-page message or system message to ME again.If ordinary terminal has been received system message or beep-page message, ignore and adjust factor pair and answer the value of cell.If ME has received system message or beep-page message, adjust by the rollback time in random access response message or default rollback time constant, obtain the special rollback time of ME.In the time that the load of base station changes, the also respective change of rollback time of the random access of ME is wished in base station.Base station need to be by the up-to-date adjustment factor or special rollback time announcement to ME.ME received after system message or beep-page message, preserve in message with the adjustment factor or special rollback time, when random access needs rollback, adopt the new adjustment factor or special rollback time in next time.
Adjusting the factor can be a scale parameter.According to network load degree, scale factor can be to be greater than 1 or be less than 1 positive number.When the adjustment factor is scale parameter, the rollback time during ME replys the random access of receiving or default rollback time constant are carried out product operation.In some application scenarios (such as ATM monitoring), ME need to have higher access priority than ordinary terminal, and the random access backoff time that ME needs is shorter than ordinary terminal, and now base station need to feed back to the scale parameter that ME is less than 1; Otherwise, need MTC terminal in random access procedure, to adopt the rollback time longer than ordinary terminal, the scale parameter that base station feedback is greater than 1 to ME.
Adjusting the factor can be a time offset, and according to network load degree, time offset can be a positive number or negative, if when negative, needs the rollback time meeting after adjusting to be greater than zero.If base station adjustment factor to ME feedback in system message or beep-page message is side-play amount, rollback time or the default rollback time constant of ME during the random access of receiving is replied carried out sum operation so.In some application scenarios (such as ATM monitoring), ME need to have higher access priority than common UE, and the random access backoff time that ME needs is shorter than ordinary terminal, and now base station need to feed back to the minus side-play amount of ME; Otherwise, need MTC terminal in random access procedure, to adopt the rollback time longer than ordinary terminal, the side-play amount that base station feedback is greater than zero to ME.
Fig. 7 is an example of present embodiment accidental access method, comprises step:
701:ME sends random access request message to base station;
When ME needs access network, can adopt and access as the accidental access method etc. of competition.
The trigger condition that ME initiates random access has multiple, and the triggering message that network side sends as received and ME power on and trigger etc.ME can select a send opportunity at random from available random access send opportunity, sends random access request message on selected send opportunity.
702: base station receives after random access request message, judge whether according to the disposal ability of self random access request that enough resource processing ME initiate;
703: if overload conditions appears in base station, in random access response message, carry ordinary terminal so and again initiate the random rollback time of accessing;
The rollback time of ordinary terminal is in the BI field domain carrying as in Fig. 6.
704: base station sends to ME by beep-page message or system message by the adjustment factor;
Base station can be notified rollback time constant to ME.
705:ME receives after random access response message, obtains the rollback time of ordinary terminal, and the rollback time of the ordinary terminal that employing adjustment factor pair is received or rollback time constant are carried out and adjusted operation, obtain the special rollback time of ME;
Base station also can directly be notified the special rollback time of ME to ME.
Adjust the factor obtains from beep-page message or system message.If the adjustment factor that MTC divides into groups special or special rollback time need in beep-page message or system message, carry group character so.
706:ME judges whether initiating random access procedure again;
If it is abnormal that the random access response message that ME receives occurs, do not receive random access response message such as not carrying RAPID or terminal in response message, terminal is initiating random access procedure again.Adopt same random access lead code if there is ME and other terminal, will produce so collision, there will be the situation of terminal random access failure.ME also can initiate to be linked at random the process of network again in this case.
If 707:ME determines initiating random access procedure again, within the special rollback time, choose randomly a value, ME initiating random access procedure again after postponing the selected time.
Fig. 8 is the system that present embodiment realizes random access, comprising: base station and ME, and base station inclusion information sending module, ME comprises access request module, wherein:
Information sending module, for sending to access request module by system message or beep-page message by benchmark rollback time and the adjustment factor; The rollback time that the basic rollback time adopts while again initiating to access at random for Human To Human's communication (H2H) terminal, or be a rollback time constant;
Access request module, adjusts factor pair and receives or the pre-configured benchmark rollback time is adjusted from information sending module for adopting, and obtains the special rollback time, while again initiating random access, sends random access request according to the special rollback time.
Or information sending module adopts the adjustment factor pair benchmark rollback time to adjust, and obtains the special rollback time, and the special rollback time obtaining is sent to access request module;
Access request module is in the time again initiating to access at random, according to special rollback time transmission random access request.
In said system, other functions of each module please refer to the description of method content.
It should be noted that, the method that above-described embodiment one and two provides is not only applicable to LTE system, is also suitable for other and supports paging mobile communication system, such as UMTS, GSM etc.Its difference is only that different mobile communication system realizes the details difference of paging or cell public information, and these difference do not affect the enforcement of method provided by the invention.
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 of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (11)
1. an accidental access method, comprising:
Pre-configured benchmark rollback time or the described benchmark rollback time is sent to described ME by network side in machine type communication terminal ME, and the adjustment factor is sent to described ME by described network side;
Described ME adopts the benchmark rollback time described in described adjustment factor pair to adjust, and obtains the special rollback time, while again initiating random access, sends random access request according to the described special rollback time;
The described benchmark rollback time is that Human To Human communicates by letter the rollback time adopting when H2H terminal is initiated to access at random again, or is a rollback time constant.
2. the method for claim 1, is characterized in that:
The described benchmark rollback time, while being the rollback time of described H2H terminal employing, sends to described ME by described network side; The described benchmark rollback time, while being described rollback time constant, is pre-configured in described ME, or sends to described ME by described network side.
3. method as claimed in claim 2, is characterized in that:
Described network side sends described rollback time constant and the described adjustment factor by system message or beep-page message to described ME.
4. method as claimed in claim 3, is characterized in that, the method also comprises:
Described network side is for different machine type communication (MTC) grouping, service priority or access priority, configure the corresponding adjustment factor, by the adjustment factor corresponding to described different grouping, service priority or access priority, send to corresponding ME by described system message or beep-page message.
5. method as claimed in claim 4, is characterized in that, the method also comprises:
Described network side carries the identification information of described grouping, service priority or access priority in described system message or beep-page message, to send to corresponding ME.
6. method as claimed in claim 3, is characterized in that:
Described network side is according to service priority or access priority, for different MTC groupings, configures the corresponding adjustment factor, by the adjustment factor corresponding described grouping, sends to the ME in described grouping by described system message or beep-page message.
7. an accidental access method, comprising:
Network side adopts the adjustment factor pair benchmark rollback time to adjust, and obtains the special rollback time, and the obtained special rollback time is sent to machine type communication terminal ME;
When described ME initiates to access at random again, according to described special rollback time transmission random access request;
The described benchmark rollback time is that Human To Human communicates by letter the rollback time adopting when H2H terminal is initiated to access at random again, or is a rollback time constant.
8. method as claimed in claim 7, is characterized in that:
Described network side is for different machine type communication (MTC) grouping, service priority or access priority, adopt the corresponding adjustment factor, the benchmark rollback time is adjusted, and by system message or beep-page message by the special rollback time obtaining, send to the ME under described different grouping, service priority or access priority.
9. a system that realizes random access, comprising: base station and machine type communication terminal ME, and described base station inclusion information sending module, described ME comprises access request module, wherein:
Described information sending module, for sending to described access request module by benchmark rollback time and the adjustment factor;
Described access request module, for adopting described adjustment factor pair to receive or the pre-configured described benchmark rollback time is adjusted from described information sending module, obtain the special rollback time, while again initiating random access, according to described special rollback time transmission random access request;
The described benchmark rollback time is that Human To Human communicates by letter the rollback time adopting when H2H terminal is initiated to access at random again, or is a rollback time constant.
10. system as claimed in claim 9, is characterized in that:
Described information sending module sends described rollback time constant and the described adjustment factor by system message or beep-page message to described access request module.
Realize the system of random access, comprising for 11. 1 kinds: base station and machine type communication terminal ME, described base station inclusion information sending module, described ME comprises access request module, wherein:
Described information sending module, for adopting the adjustment factor pair benchmark rollback time to adjust, obtains the special rollback time, and the described special rollback time obtaining is sent to described access request module;
Described access request module, when again initiating to access at random, sends random access request according to the described special rollback time;
The described benchmark rollback time is that Human To Human communicates by letter the rollback time adopting when H2H terminal is initiated to access at random again, or is a rollback time constant.
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| CN201010262540.9A CN102378364B (en) | 2010-08-24 | 2010-08-24 | Random access method and system realizing same |
| PCT/CN2011/077493 WO2012024996A1 (en) | 2010-08-24 | 2011-07-22 | Random access method and system thereof |
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| CN201010262540.9A CN102378364B (en) | 2010-08-24 | 2010-08-24 | Random access method and system realizing same |
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| CN103369553A (en) * | 2012-03-30 | 2013-10-23 | 中兴通讯股份有限公司 | A method for setting a back-off timer |
| CN102917433B (en) * | 2012-10-11 | 2016-05-11 | 北京创毅讯联科技股份有限公司 | A kind of cut-in method of machine type communication terminal and base station, terminal |
| CN104640230B (en) * | 2013-11-06 | 2019-06-14 | 株式会社Ntt都科摩 | A kind of user equipment access method and user equipment |
| CN103929826B (en) * | 2014-05-05 | 2015-11-18 | 盐城工学院 | A kind of machine type communication terminal self-adapting random cut-in method and system |
| US10397958B2 (en) * | 2017-03-17 | 2019-08-27 | Asustek Computer Inc. | Method and apparatus for backoff mechanism applied for random access procedure in a wireless communication system |
| US20190029064A1 (en) * | 2017-07-19 | 2019-01-24 | Mediatek Inc. | Method And Apparatus For Handling Re-Attempt Indicator In Mobile Communications |
| CN107969015A (en) * | 2017-11-06 | 2018-04-27 | 江苏省邮电规划设计院有限责任公司 | A kind of 5G Internet of Things electric power data acquisition terminal access controlling method |
| CN109769299B (en) * | 2017-11-09 | 2021-01-15 | 中国移动通信有限公司研究院 | Paging message sending method, base station, network equipment and communication equipment |
| CN112672434A (en) | 2018-01-25 | 2021-04-16 | Oppo广东移动通信有限公司 | Random access method, wireless device, and storage medium |
| AU2018414649A1 (en) * | 2018-03-22 | 2020-10-15 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Random access method and terminal device |
| CN110536349B (en) * | 2018-05-25 | 2023-05-09 | 中国移动通信有限公司研究院 | Method, device, equipment and storage medium for determining back-off time |
| CN111757531A (en) * | 2019-03-27 | 2020-10-09 | 普天信息技术有限公司 | Random access backspacing method and device |
| CN117044324A (en) * | 2021-03-31 | 2023-11-10 | Oppo广东移动通信有限公司 | Random access method, electronic equipment and storage medium |
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