CN103929826B - A kind of machine type communication terminal self-adapting random cut-in method and system - Google Patents
A kind of machine type communication terminal self-adapting random cut-in method and system Download PDFInfo
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Abstract
The invention discloses a kind of machine type communication terminal self-adapting random cut-in method and system, belong to moving communicating field, this method and system send lead code mainly through machine type communication terminal, base station sends accidental access response message and makes a decision according to the terminal of access, based on conflict the adaptive of terminal number, BO value is set, thus reduce again the collision rate of Stochastic accessing, improve access success rate.
Description
Technical field
The present invention relates to a kind of machine type communication self-adapting random cut-in method and system, belong to moving communicating field.
Background technology
Internet of Things (InternetofThings) is by information sensing equipment such as radio-frequency (RF) identification (RFID), infrared inductor, global positioning system, laser scanners, by the agreement of agreement, any object is connected with the Internet, carry out information exchange and communicate, to realize a kind of network of Weigh sensor to object, location, tracking, monitor and managment.Internet of Things correlation technique is applied to some extent in current mobile communication.The development direct result of mobile communication technology is the generation of structure communication system more complicated, with better function, except the communication of traditional person to person, the communication (M2M) of equipment and equipment also plays the part of pivotal player wherein by obtaining the RFID developed rapidly in net, traditional sensors network carrying M2M business faces increasing limitation and challenge, sensor network and mobile communications network is badly in need of to combine, play mobile communication and cover the features such as wide, reliability is high, transmission delay is little, form Hierarchical Mobile M2M network.
Several large main standard is organized and has been carried out research on standard work to M2M technology from different perspectives in the world, take mobile communication technology as core, on the basis analyzing M2M traffic demands, the optimisation technique of primary study mobile communication system, safe practice, to ensure that existing system can adapt to the feature of M2M communication.3GPP completes the work of Stage1 stage M2M communication requirement definition at R10 stage 3GPP, specific definition has been done to the system framework of M2M and associated specifications, in 3 gpp, M2M is also referred to as machine type communication (MTC, machinetypecommuncation), MTC is applied in the feature that the aspects such as mobility, traffic characteristics, access conditions, priority, group characteristics have oneself, conventional mobile communications network, towards person to person (H2H) communication service design, adapts to the business demand of H2H.And no matter MTC terminal is from transmission characteristic, qos requirement, mobility, or all there is a great difference with H2H terminal from the distribution density aspect of terminal.Continue to use conventional mobile communications system completely, the efficiency of system, cost and applicability all cannot reach optimum, and the system based on MTC needs to carry out improving and optimizing for its characteristic.
Along with the development of the communication technology, machine type communication (MTC, Machine-TypeCommunication) technology gets the attention.MTC technology combines data acquisition, remote monitoring, telecommunications and information technology, can make operation flow automation, the real-time status of integrated Company Date science and technology (IT) system and non-information technoloy equipment, and creates value-added service.In MTC communication system, terminal equipment is called MTC terminal.Along with the continuous maturation of MTC technology, adding to having a large amount of MTC terminal in MTC communication system, if be not optimized the access operation of MTC terminal, the performance of wireless network will be affected undoubtedly.Stochastic accessing is a basic function in radio communication, terminal quantity in MTC network is numerous, time a large amount of MTC terminal carries out Stochastic accessing simultaneously, will certainly produce huge impact to network, cause the resource of network not enough, a large amount of MTC terminal accesses can be failed; And base station, due to the impact of a large amount of signalings, can be caused deadlock or network load to become heavy, make network produce congested.
Summary of the invention
Problem to be solved by this invention is: in the prior art, and machine type communication terminal, when random access backoff, owing to can produce collision time a large amount of terminals accesses again, therefore causes accessing successful probability very low.Therefore, the present invention, according to the method for current backoff time, proposes a kind of self-adaptive access method, by keeping out of the way BO (BackOff) value based on the adaptive setting of conflict terminal number, reduce again the collision rate of Stochastic accessing, improve access success rate.
The technical solution used in the present invention is as follows:
The random self-adaptive access method of a kind of machine type communication terminal, is characterized in that comprising the following steps:
Step 1: machine type communication terminal sends random access lead code Preamble request, machine type communication terminal is selected a lead code from available lead code set equal probability and sends it to base station, then the accidental access response of the base station of network side is waited for, if correctly do not receive the response of network side within the given time, then in the Preamble maximum number of times of transmission of configuration, machine type communication terminal repeats to send Preamble;
Step 2: send accidental access response RAR message, it is produced by the medium access control MAC layer of base station, after base station solves one or more lead code on certain Stochastic accessing send opportunity, calculate corresponding random wireless network according to send opportunity and indicate RA-RNTI (RandomAccess-RadioNetworkTemporaryIdentifier) temporarily, then generate media access control layer protocol Data Unit MACPDU according to these information and send to physical layer, carried by DSCH Downlink Shared Channel DL-SCH, the MACPDU of an accidental access response comprises the accidental access response of multiple machine type communication terminal, for the MACPDU of the RAR of each machine type communication terminal, it comprises Timing Advance TA, up license ULGRANT, Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI, and base station judges whether to add rollback BO head in the MACPDU of accidental access response according to the load state of current Stochastic accessing, wherein carry Backoff time information inside BO, its effect is the transmission making terminal not carry out lead code immediately in the Stochastic accessing chance that the next one is available when there is random access collision, and be through one section and delay when keeping out of the way and resend lead code again, to reduce the collision probability between terminal,
Step 3: after machine type communication terminal receives the accidental access response of base station feedback, according to scheduling grant, above-mentioned shared link UL-SCH sends message, described message is the signaling MSG3 in Long Term Evolution LTE system, this message adopts hybrid automatic repeat-request HARQ protocol, number of retransmissions can be configured by radio resource control RRC, and the message content that this message carries is different according to access reason difference;
Step 4: manage conflict, the final step of Conflict solving random access procedure, employing following manner solves, if within the Conflict solving time of presetting, machine type communication terminal receives the Conflict solving message that base station returns, and the device identification of wherein carrying reports conforming to of base station with this machine type communication terminal, so this machine type communication terminal has just won this random access collision, Stochastic accessing success, and the C-RNTI obtained in RAR message is set to the C-RNTI of oneself, otherwise, this machine type communication terminal thinks this access failure, and re-start the retransmission processes of Stochastic accessing according to described step above.
Wherein, described in above-mentioned steps 2, BO value is determined in accordance with the following steps:
(1) base station receives message 1 (MSG1), and described message 1 is the signaling MSG1 in Long Term Evolution LTE system;
(2) base station obtains the number of the machine communication Terminal Type clashed;
(3) according to the BO value that selection one is suitable, the value of wherein said suitable BO is determined in the following manner, determine to need the terminal number retreated to be N, described N is for being not more than the integer of 2000 (comprising 2000), in following table, the value BO value retreating BI index i is BO (i), the i value meeting inequality is found according in table, make BO (i-1)≤N<BO (i), wherein, i is for being not more than the natural number of 15 (comprising 15), the equipment choice so conflicted keeps out of the way BO value for BO (i), the index of corresponding BO is i, corresponding machine type communication terminal can from 1 ~ BO (i) the inside Stochastic choice one value K, and calculate (K × i)/(ln (i)+m) round result, the described result that rounds is as described suitable BO value, as the BO value that subsequent step is arranged, wherein, ln (i) is the natural logrithm of i, m is for being not more than the natural number of N (comprising N),
(4) judge whether that the value of BO exceedes its maximum allowed or exceedes the maximum of base station setting; If so, then following step (5) is performed, if otherwise perform following step (6);
(5) by the grouping of the machine type communication terminal of conflict, be divided into activation group and dormancy group, wherein, the terminal of activation group is just according to the Stochastic accessing that the value of the BO of setting is carried out next time, and the terminal of dormancy group is notified by RAR message, that again should access after BO value just no longer carries out access attempts, and select dormancy, the group technology of activation group and dormancy group can determine according to the characteristic of machine type communication terminal, then respectively the machine type communication terminal of each group is filled to each field of accidental access response RAR message; Then step (7) is performed;
(6) BO value is set, fills each field of RAR message;
(7) RAR message is sent;
Wherein, the content of table 1 is as follows:
| BI index | The value (unit: millisecond) of BO (Back off) |
| 0 | 0 |
| 1 | 10 |
| 2 | 20 |
| 3 | 30 |
| 4 | 40 |
| 5 | 60 |
| 6 | 80 |
| 7 | 120 |
| 8 | 160 |
| 9 | 240 |
| 10 | 320 |
| 11 | 480 |
| 12 | 960 |
| 13 | 1080 |
| 14 | 1200 |
| 15 | 2001 |
Preferably, the parameter that the preset time in described step 1 is configured by upper-layer protocol judges and determines.
Preferably, the parameter that the Preamble maximum number of times of transmission of the configuration in described step 1 is configured by upper-layer protocol is determined.
Preferably, by data delay, described dormancy group can require that lower machine type communication terminal forms.
Corresponding with said method, the invention allows for a kind of machine type communication terminal self-adapting random connecting system comprising at least one machine type communication terminal and at least one base station, it performs said method.
Accompanying drawing explanation
Fig. 1: the machine type communication terminal random access procedure figure that the present invention relates to.
Fig. 2: the machine type communication terminal that the present invention relates to is based on the random access procedure figure of self adaptation rollback.；
Fig. 3: the machine type communication terminal self adaptation that the present invention relates to arranges BO value setting procedure figure.
Embodiment
A basic function in Stochastic accessing radio communication, its object makes terminal and network connect exactly, and Stochastic accessing has two kinds of patterns: based on the pattern of competition with based on non-competing pattern, these two kinds of model applications are in different scenes.Pattern scene based on competition is: the initial access under RRC (radio resource control) idle condition; Initial access after wireless losses; Under RRC connection status, the access in time having transmitting uplink data.Initial access application scenarios based on non-competing: under RRC_CONNECTED state, when there is data transfer; The random access procedure of terminal in the process switched.Based on the initial random access of contention system process as shown in Figure 1, have following several steps:
Step 1:UE sends random access guiding (Preamble) request, and UE selects a lead code from available lead code set equal probability and sends it to base station.Then the accidental access response of network side is waited for, if correctly do not receive the response of network side within the given time (parameter according to high level configuration judges), then in the Preamble maximum number of times of transmission (parameter configured by high level is determined) of configuration, UE can repeat to send Preamble.
Step 2: accidental access response (RAR) message, it is produced by the medium access control MAC layer of evolved base station eNB, after eNB solves one or more lead code on certain Stochastic accessing send opportunity, corresponding RA-RNTI (RandomAccess-RadioNetworkTemporaryIdentifier is calculated according to send opportunity, random wireless network indicates temporarily), generate MACPDU according to these information and send to physical layer, carried by DSCH Downlink Shared Channel DL-SCH, an accidental access response MACPDU can comprise the accidental access response of multiple terminal UE, RARMACPDU main contents for each UE comprise Timing Advance TA, up license ULGRANT, interim C-RNTI etc.In addition, eNB can also judge whether in the MACPDU of accidental access response, add the sub-head of rollback according to the load state of current Stochastic accessing, Backoff time information is carried inside BI, its effect makes user not carry out lead code transmission in the Stochastic accessing chance that the next one is available immediately when there is random access collision, and be through one section and delay when keeping out of the way and resend lead code again, thus reduce the probability of the collision between user.
Step 3:UE according to scheduling grant, sends MSG3 after receiving the accidental access response of eNB feedback on the ul-sch.MSG3 adopts HARQ, and number of retransmissions can be configured by RRC, and the message content of the upper carrying of MSG3 is different according to access reason difference.
Step 4: Conflict solving.Conflict solving is the final step of the random access procedure based on collision, Conflict solving can adopt based on the C-RNTI of transmission on PDCCH or the scheme based on the UE Conflict solving transmitted on DL-SCH, wherein a kind of scheme is: if within the Conflict solving time of presetting, machine type communication terminal receives the Conflict solving message that base station returns, and the device identification of wherein carrying reports conforming to of base station with this machine type communication terminal, so this machine type communication terminal has just won this random access collision, Stochastic accessing success, and the C-RNTI obtained in RAR message is set to the C-RNTI of oneself, otherwise this machine type communication terminal thinks this access failure, and re-start the retransmission processes of Stochastic accessing according to described step above.
In the random access procedure, several situation is had to adopt fallback mechanism: one is that Stochastic accessing is abnormal; Another in UE access, produces collision cause some UE access failure.In addition when system is in the situation of overload, the resource that more transmission RRC information of cannot reallocating uses, at this time wish that UE postpones some time transmission RACH request, realized by rollback (BO) parameter inside access response and accidental access response message RAR form, this parameter is exactly the parameter of fallback mechanism, the UE receiving RAR sends the inside has BO to indicate, so it stores this value, when needing again Stochastic accessing subsequently, from 0 to BO value, select a value as postponing the time sending targeting sequencing at random.In current agreement, the unit of rollback is millisecond, can select one: 0,20,30,40,60,80,120,160,240,320,480,960 in the value from table 1.Base station sends to the BO parameter of carrying in the accidental access response message of UE to be that base station determines according to the load of machinery systems.
| BI index | The value (unit: millisecond) of Back off (BO) |
| 0 | 0 |
| 1 | 10 |
| 2 | 20 |
| 3 | 30 |
| 4 | 40 |
| 5 | 60 |
| 6 | 80 |
| 7 | 120 |
| 8 | 160 |
| 9 | 240 |
| 10 | 320 |
| 11 | 480 |
| 12 | 960 |
| 13 | 1080 |
| 14 | 1200 |
| 15 | 2001 |
Table 1 retreats field value list
Due to MTC terminal Numerous, time a large amount of terminals carries out Stochastic accessing simultaneously, resource in network is inadequate, collision will inevitably be produced, therefore within the BO time, Stochastic choice value accesses again, if the value of the BO arranged is much smaller than the terminal number needing again to access, the chance of so colliding increases greatly, if the value of the BO arranged is greater than the terminal number needing again to access, time interval of again accessing so also can be caused elongated, the efficiency of such system also declines accordingly, therefore except according to except load of base station, also need the value determining BO according to the terminal number of access interference dynamically.
When the MTC device as UE carries out RACH access, send Preamble, then wait until the response of eNB, eNB, when receiving multiple RACH and accessing, judges number and the kind of MTC device, then sets the value of BO.
According to timeslot-based ALOHA principle, when access number is equal with number of time slot time, access successful maximum probability.In the random access procedure, first time access unsuccessful after, the terminal of conflict retreats and again accesses, if having N number of step back values that can select, the terminal of L Stochastic accessing, if L is much larger than N, the probability collided time so next time during Stochastic accessing is just very large, when only having L close to N, and successfully access and do not send the maximum probability of collision, but select the probability of identical back off time very large, the probability again clashed is also very large.
Based on above-mentioned consideration, the present invention proposes a kind of base station arranges the value of BO scheme according to the number equipment of the MTC device of access transmission conflict, its setting procedure as shown in Figure 3, the terminal number retreated is needed to be N, N be not more than 2000 integer, according to aforementioned table 1, the value BO value retreating BO index i is BO (i), BO (i-1)≤N<BO (i) is found according in table, the equipment choice so conflicted keeps out of the way BO value for BO (i), the index of corresponding BO is i, corresponding MTC terminal can from 1 ~ BO (i) the inside Stochastic choice one value K, and calculate (K × i)/(ln (i)+m) round result, the described result that rounds is as described suitable BO value, as the BO value that subsequent step is arranged, wherein, ln (i) is the natural logrithm of i, m is the natural number being not more than N, can 1 be preferably, 2 or 3.
If the terminal number of conflict is greater than the value of the maximum BO of retrogressing that current base station can provide, so terminal is divided into 2 groups: activation group and dormancy group, the terminal of activation group is just according to the Stochastic accessing that the value of the BO of setting is carried out next time, and the terminal of dormancy group is notified by RAR message, that again should access after BO value just no longer carries out access attempts, and selects dormancy.The group technology of activation group and dormancy group can determine according to the characteristic of MTC terminal, such as, require lower can be set as dormancy group to data delay.
By said method, the adaptive value arranging BO, when the MTC terminal of different number initiates access interference, thus can make the maximum probability accessed again of MTC terminal, effectively improve systematic function.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention, and all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a machine type communication terminal self-adapting random cut-in method, is characterized in that comprising the following steps:
Step 1: machine type communication terminal sends random access lead code (Preamble) request, machine type communication terminal is selected a lead code from available lead code set equal probability and sends it to base station, then the accidental access response of the base station of network side is waited for, if correctly do not receive the response of network side within the given time, then in the lead code maximum number of times of transmission of configuration, machine type communication terminal repeats to send lead code;
Step 2: send accidental access response (RAR) message, it is produced by medium access control (MAC) layer of base station, after base station solves one or more lead code on certain Stochastic accessing send opportunity, corresponding random Radio Network Temporary Identifier RA-RNTI (RandomAccess-RadioNetworkTemporaryIdentifier) is calculated according to send opportunity, then generate media access control layer protocol Data Unit (MACPDU) according to these information and send to physical layer, carried by DSCH Downlink Shared Channel (DL-SCH), the media access control layer protocol Data Unit of an accidental access response comprises the accidental access response of multiple machine type communication terminal, for the media access control layer protocol Data Unit of the accidental access response of each machine type communication terminal, it comprises Timing Advance (TA), up license (ULGRANT), Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI, and base station judges whether to add rollback BO head in the media access control layer protocol Data Unit of accidental access response according to the load state of current Stochastic accessing, wherein carry Backoff time information inside BO, its effect is the transmission making terminal not carry out lead code immediately in the Stochastic accessing chance that the next one is available when there is random access collision, and be through one section and delay when keeping out of the way and resend lead code again, to reduce the collision probability between terminal,
Step 3: after machine type communication terminal receives the accidental access response of base station feedback, according to scheduling grant, up shared link (UL-SCH) sends message, described message is the signaling MSG3 in Long Term Evolution LTE system, this message adopts hybrid automatic repeat-request HARQ protocol, number of retransmissions can be configured by radio resource control RRC, and the message content that this message carries is different according to access reason difference;
Step 4: manage conflict, the final step of Conflict solving random access procedure, employing following manner solves, if within the Conflict solving time of presetting, machine type communication terminal receives the Conflict solving message that base station returns, and the device identification of wherein carrying reports conforming to of base station with this machine type communication terminal, so this machine type communication terminal has just won this random access collision, Stochastic accessing success, and the C-RNTI obtained in accidental access response message is set to the C-RNTI of oneself; Otherwise this machine type communication terminal thinks this access failure, and re-start the retransmission processes of Stochastic accessing according to described step above;
Wherein, described in above-mentioned steps 2, BO value is determined in accordance with the following steps:
(1) base station receives message, and described message is the signaling MSG1 in Long Term Evolution LTE system;
(2) base station obtains the number of the machine type communication terminal clashed;
(3) according to the BO value that selection one is suitable, the value of wherein said suitable BO is determined in the following manner, determine to need the terminal number retreated to be N, described N is the integer of less than 2000, in following table, when the value of retrogressing index BI is i, corresponding BO value is BO (i), the i value meeting inequality is found according in table, make BO (i-1)≤N<BO (i), wherein, i is the natural number of less than 15, the equipment choice so conflicted keeps out of the way BO value for BO (i), the index of corresponding BO is i, corresponding machine type communication terminal can from 1 ~ BO (i) the inside Stochastic choice one value K, and calculate (K × i)/(ln (i)+m) round result, the described result that rounds is as described suitable BO value, as the BO value that subsequent step is arranged, wherein, ln (i) is the natural logrithm of i, m is the natural number of below N,
(4) judge whether the value of BO exceedes its maximum allowed or exceed the maximum of base station setting; If so, then following step (5) is performed, if otherwise perform following step (6);
(5) by the grouping of the machine type communication terminal of conflict, be divided into activation group and dormancy group, wherein, the terminal of activation group is just according to the Stochastic accessing that the value of the BO of setting is carried out next time, and the terminal of dormancy group is notified by accidental access response message, that again should access after BO value just no longer carries out access attempts, and select dormancy, the group technology of activation group and dormancy group can determine according to the characteristic of machine type communication terminal, then respectively the machine type communication terminal of each group is filled to each field of accidental access response message; Then step (7) is performed;
(6) BO value is set, fills each field of accidental access response message;
(7) accidental access response message is sent;
Wherein, the content of described table is as follows:
。
2. the method for claim 1, is characterized in that: the parameter that the preset time in described step 1 is configured by upper-layer protocol judges and determines.
3. the method for claim 1, is characterized in that: the parameter that the lead code maximum number of times of transmission of the configuration in described step 1 is configured by upper-layer protocol is determined.
4. the method for claim 1, is characterized in that: by data delay, described dormancy group can require that lower machine type communication terminal forms.
5. the method for claim 1, is characterized in that: described m can be 1,2 or 3.
6. a machine type communication terminal self-adapting random connecting system, is characterized in that comprising:
At least one machine type communication terminal and at least one base station, wherein,
Described at least one machine type communication terminal, it sends random access lead code (Preamble) request, machine type communication terminal is selected a lead code from available lead code set equal probability and sends it to base station, then the accidental access response of the base station of network side is waited for, if correctly do not receive the response of network side within the given time, then in the lead code maximum number of times of transmission of configuration, machine type communication terminal repeats to send lead code;
Described at least one base station, send accidental access response (RAR) message, it is produced by medium access control (MAC) layer of base station, after base station solves one or more lead code on certain Stochastic accessing send opportunity, corresponding random Radio Network Temporary Identifier RA-RNTI (RandomAccess-RadioNetworkTemporaryIdentifier) is calculated according to send opportunity, then generate media access control layer protocol Data Unit (MACPDU) according to these information and send to physical layer, carried by DSCH Downlink Shared Channel (DL-SCH), the media access control layer protocol Data Unit of an accidental access response comprises the accidental access response of multiple machine type communication terminal, for the media access control layer protocol Data Unit of the accidental access response of each machine type communication terminal, it comprises Timing Advance (TA), up license (ULGRANT), Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI, and base station judges whether to add rollback BO head in the media access control layer protocol Data Unit of accidental access response according to the load state of current Stochastic accessing, wherein carry Backoff time information inside BO, its effect is the transmission making terminal not carry out lead code immediately in the Stochastic accessing chance that the next one is available when there is random access collision, and be through one section and delay when keeping out of the way and resend lead code again, to reduce the collision probability between terminal,
After described at least one machine type communication terminal receives the accidental access response of described at least one base station feedback, according to scheduling grant, up shared link (UL-SCH) sends message, described message is the signaling MSG3 in Long Term Evolution LTE system, this message adopts hybrid automatic repeat-request HARQ protocol, number of retransmissions can be configured by radio resource control RRC, and the message content that this message carries is different according to access reason difference;
Described at least one machine type communication terminal and at least one base station adopt following manner to manage conflict: if within the Conflict solving time of presetting, machine type communication terminal receives the Conflict solving message that base station returns, and the device identification of wherein carrying reports conforming to of base station with this machine type communication terminal, so this machine type communication terminal has just won this random access collision, Stochastic accessing success, and the C-RNTI obtained in accidental access response message is set to the C-RNTI of oneself, otherwise, this machine type communication terminal thinks this access failure, and re-start the retransmission processes of Stochastic accessing,
Wherein, described BO value is determined in accordance with the following steps:
(1) base station receives message 1, and described message 1 is the signaling MSG1 in Long Term Evolution LTE system
(2) base station obtains the number of the machine type communication terminal clashed;
(3) according to the BO value that selection one is suitable, the value of wherein said suitable BO is determined in the following manner, determine to need the terminal number retreated to be N, described N is the integer of less than 2000, in following table, when the value of retrogressing index BI is i, corresponding BO value is BO (i), the i value meeting inequality is found according in table, make BO (i-1)≤N<BO (i), wherein, i is the natural number of less than 15, the equipment choice so conflicted keeps out of the way BO value for BO (i), the index of corresponding BO is i, corresponding machine type communication terminal can from 1 ~ BO (i) the inside Stochastic choice one value K, and calculate (K × i)/(ln (i)+m) round result, the described result that rounds is as described suitable BO value, as the BO value that subsequent step is arranged, wherein, ln (i) is the natural logrithm of i, m is the natural number of below N,
(4) judge whether the value of BO exceedes its maximum allowed or exceed the maximum of base station setting; If so, then following step (5) is performed, if otherwise perform following step (6);
(5) by the grouping of the machine type communication terminal of conflict, be divided into activation group and dormancy group, wherein, the terminal of activation group is just according to the Stochastic accessing that the value of the BO of setting is carried out next time, and the terminal of dormancy group is notified by accidental access response message, that again should access after BO value just no longer carries out access attempts, and select dormancy, the group technology of activation group and dormancy group can determine according to the characteristic of machine type communication terminal, then respectively the machine type communication terminal of each group is filled to each field of accidental access response message; Then step (7) is performed;
(6) BO value is set, fills each field of accidental access response message;
(7) accidental access response message is sent;
Wherein, the content of described table is as follows:
。
7. system as claimed in claim 6, is characterized in that: the parameter that the preset time of described at least one machine type communication terminal and/or the lead code maximum number of times of transmission of transmission are configured by upper-layer protocol is determined.
8. system as claimed in claim 6, is characterized in that: the parameter that the lead code maximum number of times of transmission of the transmission of described at least one machine type communication terminal is configured by upper-layer protocol is determined.
9. system as claimed in claim 6, is characterized in that: by data delay, described dormancy group can require that lower machine type communication terminal forms.
10. system as claimed in claim 6, is characterized in that: described m can be 1,2 or 3.
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| CN201410186773.3A CN103929826B (en) | 2014-05-05 | 2014-05-05 | A kind of machine type communication terminal self-adapting random cut-in method and system |
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| CN105992383B (en) * | 2015-01-29 | 2021-06-22 | 中兴通讯股份有限公司 | Random access response message sending method and node |
| KR20220164064A (en) | 2015-07-27 | 2022-12-12 | 애플 인크. | Enhanced rach (random access channel) design for 5g ciot (cellular internet of things) |
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| US10200874B2 (en) * | 2016-09-29 | 2019-02-05 | Qualcomm Incorporated | Signature sequence for system identification in a shared spectrum |
| CN117460078A (en) * | 2017-03-24 | 2024-01-26 | 华为技术有限公司 | Method and apparatus for random access response and method and apparatus for random access |
| CN108696883B (en) * | 2017-04-11 | 2021-01-22 | 电信科学技术研究院 | Method and device for adjusting data transmission repetition times |
| CN109548077A (en) * | 2017-08-11 | 2019-03-29 | 华为技术有限公司 | Communication means, terminal device and the network equipment |
| CN109561442A (en) * | 2017-09-25 | 2019-04-02 | 维沃移动通信有限公司 | Communication means and device, user equipment and storage medium |
| US10568147B2 (en) * | 2017-11-16 | 2020-02-18 | Qualcomm Incorporated | Uplink specific backoff indicator |
| CN109803445B (en) * | 2017-11-17 | 2021-01-29 | 华为技术有限公司 | Communication method and device |
| CN108289128B (en) * | 2018-01-31 | 2019-04-30 | 成都物梦工场信息技术有限公司 | Manage the method, apparatus and computer readable storage medium of internet-of-things terminal |
| CN114222374A (en) * | 2018-04-04 | 2022-03-22 | 华为技术有限公司 | Communication method and device |
| CN109343469B (en) * | 2018-10-25 | 2021-08-17 | 中电望辰科技有限公司 | Intelligent milling machine control method and system based on Internet of things |
| WO2020223878A1 (en) * | 2019-05-06 | 2020-11-12 | Oppo广东移动通信有限公司 | Random access method, terminal device and network device |
| CN110620609B (en) | 2019-08-28 | 2021-05-14 | 无锡睿思凯科技股份有限公司 | Data communication method, main equipment and system |
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