CN103857056A - Method for reducing random access collision in machine type communication-based communication network - Google Patents
Method for reducing random access collision in machine type communication-based communication network Download PDFInfo
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- CN103857056A CN103857056A CN201210501199.7A CN201210501199A CN103857056A CN 103857056 A CN103857056 A CN 103857056A CN 201210501199 A CN201210501199 A CN 201210501199A CN 103857056 A CN103857056 A CN 103857056A
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Abstract
The invention relates to a method for reducing a random access collision in machine type communication user equipment of machine type communication-based communication system, wherein the machine type communication user equipment has low mobility. The method comprises the following steps that: a time adjustment parameter is recorded as a first time adjustment parameter during successful communication with a base station; when a new random access needs to be initiated, a random access guiding message is sent to the base station; a random access response message from the base station is received, wherein the random access response message includes a second time adjustment parameter; the recorded first time adjustment parameter is compared with the received second time adjustment parameter; if the difference value of the first time adjustment parameter and the second time adjustment parameter is in a predetermined error range, an L2/L3 message is sent to the base station continuously; and otherwise, a new random access is initiated again after predetermined time regression is carried out. According to the scheme, on the basis of active collision detection and regression, the collision probability is substantially reduced and the access capacity is increased.
Description
Technical field
The present invention relates to the communication system based on machine type communication, particularly, relate in the communication system based on machine type communication for reducing the method for random access collision.
Background technology
Machine type communication (Machine Type Communication:MTC) is the new project of introducing in Long Term Evolution LTE (Long Term Evolution) system.A lot of MTC subscriber equipmenies have the feature of Hypomobility.For example water meter, ammeter do not move; The mobile station of selling goods is not roving; Household health detector only moves in specific region.
In prior art, MTC subscriber equipment adopts Random Access Channel (RandomAccess Channel:RACH) to send signaling and packet more.But the quantity of the MTC subscriber equipment in specific region may be very large, therefore in the communication system based on machine type communication, will face by contingent MTC business and increase sharply and bring Random Access Channel overload.
For example, in current standard, only have 64-Ncf the available Physical Random Access Channel guiding (Preamble) based on competition, wherein Ncf is the quantity of being kept for uncontested Random Access Channel by base station.Thus, in a specific region, if a large amount of MTC subscriber equipment initiates to access at random process simultaneously, may cause Random Access Channel crowded.If there is guiding collision, can cause the subscriber equipment of collision in the time transmitting their 2/ layer of 3 (L2/L3) message of layer, in identical uplink time/frequency source, also can bump.This will cause serious interference, so that in the subscriber equipment bumping, neither one can be correctly decoded, thereby causes the waste of this running time-frequency resource.
Random Access Channel overload can affect the communication of user to user (Human to Human:H2H), therefore in prior art, proposed some and reduce in the communication system based on machine type communication the method for random access collision.But these methods are all the overload that prevents the Random Access Channel in wireless access network by the random access attempts of minimizing MTC subscriber equipment or restriction MTC access capacity.And because parameters all in the method having proposed is all the statistical parameter from the peak value of the MTC activity of predicting, the definite source that is difficult to judgement overload also arranges adaptive parameter, and this will cause utilizing of ascending resource poor.
Summary of the invention
Based on above consideration, if can propose a kind of can being highly profitable without the method that reduces the random access attempts of MTC subscriber equipment or restriction MTC access capacity and just can reduce random access collision.
According to a first aspect of the invention, proposed a kind of in the machine type communication subscriber equipment of the communication system based on machine type communication for reducing the method for random access collision, wherein, described machine type communication subscriber equipment has Hypomobility, and described method comprises the steps: that it is the very first time to adjust parameter that the time of a. when successfully with base station communication is adjusted reference record; B. in the time that needs are initiated new random access, send random access guide messages to described base station; C. receive the accidental access response message from described base station, wherein, described accidental access response message comprises the second time adjustment parameter; D. recorded very first time adjustment parameter and received the second time adjustment parameter are compared; If e. the difference of described first, second time adjustment parameter, in predetermined error range, continues to send L2/L3 message to described base station; Otherwise after the slow astern scheduled time, re-execute again step b-e.
According to one embodiment of the present of invention, in the time that described base station sends L2/L3 message, adopt described the second time to adjust parameter the transmitting time of described L2/L3 message is adjusted.
According to one embodiment of the present of invention, also comprise according to method of the present invention: receive the acknowledge message to sent L2/L3 message from described base station; It is the very first time to adjust parameter that described the second time is adjusted to reference record.
According to a second aspect of the invention, proposed a kind of in the base station of the communication system based on machine type communication for reducing the method for random access collision, wherein, communication system based on machine type communication comprises multiple machine type communication subscriber equipmenies with Hypomobility, and described method comprises the steps: to receive the random access guide messages from described multiple machine type communication subscriber equipmenies; Detect the guide messages of the first machine type communication subscriber equipment nearest or in nearest region, the described base station of distance from the described base station of distance; Mode with broadcast sends accidental access response message, and described accidental access response message comprises the time adjustment parameter corresponding with described the first machine type communication subscriber equipment; Receive and decode from the L2/L3 message of described the first machine type communication subscriber equipment.
According to one embodiment of the present of invention, also comprise according to method of the present invention: send the confirmation about L2/L3 message received, that sent by described the first machine type communication subscriber equipment to described the first machine type communication subscriber equipment.
According to one embodiment of the present of invention, described in there is Hypomobility machine type communication subscriber equipment be what not move/not roving/only mobile machine type communication subscriber equipment in specific region.
Adopt collision detection mechanism initiatively according to the solution of the present invention.Collision detection initiatively can reduce widely collision probability and increase access capacity with retreating.Thereby can improve the ROA to resource, and reduce the impact on H2H communication performance.
In addition, according to method of the present invention and method compatibility of the prior art, can use with additive method, simultaneously.
Various aspects of the present invention are by the explanation of the specific embodiment by hereinafter and more clear.
Accompanying drawing explanation
By reading the following detailed description to non-limiting example with reference to accompanying drawing, it is more obvious that other features, objects and advantages of the present invention will become.In accompanying drawing:
Fig. 1 shows the network topological diagram according to one embodiment of the present of invention;
Fig. 2 shows the method flow graph according to an embodiment of the invention.
In the drawings, run through different diagrams, same or similar Reference numeral represents same or analogous device (module).
Embodiment
In the specific descriptions of following preferred embodiment, with reference to the appended accompanying drawing that forms a part of the present invention.Appended accompanying drawing shows by way of example can realize specific embodiment of the present invention.The embodiment of example is not intended to limit according to all embodiment of the present invention.Be appreciated that not departing under the prerequisite of scope of the present invention, can utilize other embodiment, also can carry out the modification of structural or logicality.Therefore, following specific descriptions are also nonrestrictive, and scope of the present invention is limited by appended claim.
Before introducing according to the specific embodiment of the present invention, the method about Random Access Channel overload in the communication system reducing based on MTC that paper has once proposed in prior art.
1) scheme is blocked in access classification
For MTC subscriber equipment is introduced independent access grade, to make network can control distinctively the access from these MTC subscriber equipmenies.According to the required granularity to the control of MTC subscriber equipment, can introduce one or several access grade.
2) for MTC subscriber equipment arranges independent random access channel resource scheme
In the time of MTC subscriber equipment and the shared random access channel resource of H2H subscriber equipment, their access collision probability is identical.For arranging respectively independently random access channel resource, MTC subscriber equipment and H2H subscriber equipment can reduce the impact of MTC subscriber equipment on H2H subscriber equipment.But the resource of H2H subscriber equipment will be reduced like this, and limit the capacity of MTC subscriber equipment.
3) MTC subscriber equipment specifically retreats scheme
MTC subscriber equipment specifically retreats random access (again) trial that scheme can postpone them.For MTC subscriber equipment and H2H subscriber equipment arrange the different time that retreats, for example, for the time that retreats of MTC subscriber equipment setting is longer, for the setting of H2H subscriber equipment to retreat the time shorter.The delay of MTC subscriber equipment may be long like this, and be difficult to judge the source of overload the suitable time that retreats for MTC subscriber equipment and the setting of H2H subscriber equipment.
4) slot type access
For MTC subscriber equipment definition access period/access groove, each MTC equipment only counts in its special access groove.Each MTC equipment is associated with access groove by its ID (IMSI).So, unpredictable and consistent in the situation that in the MTC subscriber equipment activity time, may cause the Efficiency Decreasing of MTC peak value.
But these methods of the prior art are all the overload that prevents the Random Access Channel in wireless access network by the random access attempts of minimizing MTC subscriber equipment or restriction MTC access capacity on the one hand, also poor to the utilization of ascending resource on the other hand.
Fig. 1 shows the network topological diagram according to one embodiment of the present of invention.
Can be used in the communication system based on machine type communication according to method of the present invention, this communication system comprises base station eNB 10, multiple MTC subscriber equipment 21,22, multiple H2H subscriber equipment 31,32.
As shown in Figure 1, MTC subscriber equipment 21 is distant with base station eNB 10, and the close together of MTC subscriber equipment 22 and base station eNB 10.Similarly, H2H subscriber equipment 31 is distant with base station eNB 10, and the close together of H2H subscriber equipment 32 and base station eNB 10.According to the distance apart from base station eNB 10, from closely to sequence far away, the order of illustrated 4 equipment is: MTC subscriber equipment 22, H2H subscriber equipment 32, MTC subscriber equipment 21, H2H subscriber equipment 31.
For apart from the far and near different equipment in base station 10, propagation delay T
palso different.Therefore, need to the introducing time adjust parameter TA (Timing Advance), compensate propagation delay T
pbetween gap, thereby make different user devices send signal can align at base station place.
In prior art, the time is adjusted parameter TA=2T
p, wherein, T
prepresent propagation delay, and depend on the distance between subscriber equipment and base station.
Because H2H subscriber equipment generally has stronger mobility, propagation delay T
pcan often change in time, therefore, for H2H subscriber equipment, there is no need storage and propagation delay T
pthe relevant time is adjusted parameter TA.
But a lot of MTC subscriber equipmenies all have the feature of Hypomobility.Such as water meter, ammeter etc. are installed in fixed location, do not move; The mobile station of selling goods is not roving; Household health detector only moves in the specific region of for example home-ranges.The MTC subscriber equipment of these Hypomobilities do not move or moving range little, adjust parameter and change and exceed predetermined threshold because self-position changes the time that can not cause.Therefore, can think, for the MTC subscriber equipment of Hypomobility, adjust parameter TA and remain unchanged.According in this embodiment of the present invention, MTC subscriber equipment the 21, the 22nd, has the MTC subscriber equipment of Hypomobility.
Fig. 2 shows the method flow graph according to one embodiment of the present of invention.Below take the communication process between machine type communication subscriber equipment 21 and base station eNB 10 as example, in conjunction with Fig. 1 and Fig. 2 describe according to of the present invention in the communication system based on machine type communication for reducing the method for random access collision.
First,, while supposing before MTC subscriber equipment 21 once successfully random access base station eNB10, it is TA1 that the time corresponding with it is adjusted parameter.In method step S201, TA1 is recorded as very first time adjustment parameter by MTC subscriber equipment 21.
Subsequently, in method step S202, when MTC subscriber equipment 21 is initiated new random access at needs, send random access guide messages to base station eNB 10.
And at synchronization, MTC subscriber equipment 22 is also initiated new random access, send random access guide messages to base station eNB 10, and just used same steering signal.
According to one embodiment of the present of invention, random access guiding comprises the information of the L2/L3 message size that this MTC subscriber equipment of indication will send.
In method step S203, base station eNB 10 detect from apart from base station eNB 10 nearest or guide messages in the subscriber equipment apart from the nearest region of base station eNB 10.According to the embodiment shown in Fig. 1, apart from base station eNB 10 nearest or in being MTC subscriber equipment 22 apart from the subscriber equipment in the nearest region of base station eNB 10.
Subsequently, in method step S204, base station eNB 10 sends accidental access response message (Random Access Response:RAR) in the mode of broadcast in Physical Downlink Shared Channel, comprising the time adjustment parameter corresponding with MTC subscriber equipment 22, hereinafter, this time adjustment parameter is called the second adjustment parameter.
According to one embodiment of the present of invention, in accidental access response message, also comprise the mark to detected guiding, the information of indicating the ascending resource of distributing to L2/L3 message and interim cellular radio temporary mark (Cell-Radio Network Temporary IdentifierC-RNTI).According to an alternative embodiment of the invention, in accidental access response message, can also comprise the indication to retreating the time.
Here in described embodiment, if MTC subscriber equipment 21 is in method step S205, recorded very first time adjustment parameter and received the second time adjustment parameter are compared, and the difference of determining first, second time adjustment parameter exceeds predetermined error range, after the slow astern scheduled time, re-executes step S202 to S205 again.
According to one embodiment of the present of invention, predetermined error range is corresponding to the granularity of described time adjusted value.In LTE system, predetermined error range is corresponding to 0.52 μ s.And in LTE system, TA can distinguish the propagation delay within the scope of 0-0.67ms with the granularity of 0.52 μ s, and this is corresponding to the radius of society of 100km.
According to one embodiment of the present of invention, the scheduled time of stepping back is random.According to an alternative embodiment of the invention, in accidental access response message, also comprise the indication to retreating the time.
Those skilled in the art can understand, and can also set the time of stepping back according to other rules.For example can combine with scheme of the prior art, be MTC subscriber equipment classification, and different stepping back the time is set for the MTC subscriber equipment of each classification.For example, the time that the MTC subscriber equipment that priority is low is stepped back is long, and the time that the MTC subscriber equipment that priority is high is stepped back is short.
But, in according to an alternative embodiment of the invention, initiate the MTC subscriber equipment of random access request simultaneously, it is the nearest MTC subscriber equipment 22 of the distance base station eNB 10 shown in Fig. 1, in method step S205, recorded very first time adjustment parameter and received the second time adjustment parameter are compared, and the difference of determining first, second time adjustment parameter is in predetermined error range, in method step S206, continues to send L2/L3 message to base station eNB 10.
According to one embodiment of the present of invention, MTC subscriber equipment 22 is adopting base station eNB 10 to distribute to the ascending resource of L2/L3 message in the time that base station eNB 10 sends L2/L3 message, and adopts for the second time adjusted parameter the transmitting time of L2/L3 message is adjusted.
Base station eNB 10 receives and decodes from the L2/L3 message of MTC subscriber equipment 22 in method step S206, and sends the confirmation about L2/L3 message received, that sent by MTC subscriber equipment 22 to MTC subscriber equipment 22 in method step S207.
MTC subscriber equipment 22, after receiving the confirmation information, is got back to method step S201, and it is the very first time to adjust parameter that the second time was adjusted to reference record.
In foundation other embodiment of the present invention, if H2H subscriber equipment is initiated random access recently and simultaneously apart from base station eNB 10, the time comprising in RAR is adjusted parameter by corresponding with H2H subscriber equipment, and MTC subscriber equipment 21 and 22 is initiated random access request more again after all wanting slow astern predetermined time.
Emulated data shows, according to the solution of the present invention, can reduce widely the collision probability of Random Access Channel.Even if in the situation that random access guiding bumps, according to the solution of the present invention, can at least guarantee that the subscriber equipment nearest apart from base station still can utilize current running time-frequency resource to send L2/L3 message, and the collision that produces L2/L3 message unlike other method, thereby improve the utilization of ascending resource, and improve the capacity of MTC subscriber equipment.
It should be noted that, above-described embodiment is only exemplary, but not limitation of the present invention.Within any technical scheme that does not deviate from spirit of the present invention all should fall into protection scope of the present invention.In addition, any Reference numeral in claim should be considered as limiting related claim; " comprise " that a word do not get rid of device unlisted in other claim or specification or step; " one " before device does not get rid of the existence of multiple such devices; In the equipment that comprises multiple devices, the one or more function in the plurality of device can be realized by same hardware or software module; The word such as " first ", " second ", " the 3rd " is only used for representing title, and does not represent any specific order.
Claims (15)
- In the machine type communication subscriber equipment of the communication system based on machine type communication for reducing a method for random access collision, wherein, described machine type communication subscriber equipment has Hypomobility, described method comprises the steps:A. to adjust reference record be the very first time to adjust parameter the time when successfully with base station communication;B. in the time that needs are initiated new random access, send random access guide messages to described base station;C. receive the accidental access response message from described base station, wherein, described accidental access response message comprises the second time adjustment parameter;D. recorded very first time adjustment parameter and received the second time adjustment parameter are compared;If e. the difference of described first, second time adjustment parameter, in predetermined error range, continues to send L2/L3 message to described base station; Otherwise after the slow astern scheduled time, re-execute again step b-e.
- 2. method according to claim 1, is characterized in that, in described step e, adopts described the second time to adjust parameter the transmitting time of described L2/L3 message is adjusted in the time that described base station sends L2/L3 message.
- 3. method according to claim 1, is characterized in that, after described step e, also comprises:F. receive the acknowledge message to sent L2/L3 message from described base station;G. being adjusted to reference record described the second time is the very first time to adjust parameter.
- 4. method according to claim 1, is characterized in that, the random access guiding in described step b comprises the information of indicating described L2/L3 message size.
- 5. method according to claim 1, is characterized in that, also comprises the information of indicating the ascending resource of distributing to L2/L3 message in the accidental access response message in described step c;And in step e, in the time sending L2/L3 message to described base station, distribute to the ascending resource of L2/L3 message described in employing.
- 6. method according to claim 1, is characterized in that, also comprises the indication to retreating the time in the accidental access response message in described step c.
- 7. method according to claim 1, is characterized in that, described in there is Hypomobility machine type communication subscriber equipment be what not move/not roving/only mobile machine type communication subscriber equipment in specific region.
- 8. method according to claim 1, is characterized in that, described predetermined error range is corresponding to the granularity of described time adjusted value.
- 9. method according to claim 1, is characterized in that, in LTE system, described predetermined error range is corresponding to 0.52 μ s.
- 10. method according to claim 1, is characterized in that, described in scheduled time of stepping back be random.
- 11. 1 kinds in the base station of the communication system based on machine type communication for reducing the method for random access collision, wherein, communication system based on machine type communication comprises multiple machine type communication subscriber equipmenies with Hypomobility, and described method comprises the steps:A. receive the random access guide messages from described multiple machine type communication subscriber equipmenies;B. detect the guide messages of the first user equipment nearest or in nearest region, the described base station of distance from the described base station of distance;C. send accidental access response message in the mode of broadcast, described accidental access response message comprises the time adjustment parameter corresponding with described first user equipment;D. receive and decode from the L2/L3 message of described the first machine type communication subscriber equipment.
- 12. methods according to claim 11, is characterized in that, after described step D, also comprise:E. send the confirmation about L2/L3 message received, that sent by described the first machine type communication subscriber equipment to described the first machine type communication subscriber equipment.
- 13. methods according to claim 11, is characterized in that, also comprise the information of indicating the ascending resource of distributing to L2/L3 message in the accidental access response message in described step C.
- 14. methods according to claim 11, is characterized in that, also comprise the indication to retreating the time in the accidental access response message in described step C.
- 15. methods according to claim 11, is characterized in that, described in there is Hypomobility machine type communication subscriber equipment be what not move/not roving/only mobile machine type communication subscriber equipment in specific region.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105764152A (en) * | 2014-12-19 | 2016-07-13 | 联想(北京)有限公司 | Information processing method and base station |
| CN107046672A (en) * | 2016-02-05 | 2017-08-15 | 中兴通讯股份有限公司 | A kind of accidental access method and device |
| CN107094281A (en) * | 2017-03-31 | 2017-08-25 | 全球能源互联网研究院 | Cut-in method and system during a kind of M2M equipment access base station |
| CN109729599A (en) * | 2018-12-28 | 2019-05-07 | 芯翼信息科技(上海)有限公司 | Data transmission method and data transmission system |
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| CN102651908A (en) * | 2011-02-28 | 2012-08-29 | 华为技术有限公司 | Method and equipment for transmitting data |
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| CN101162957A (en) * | 2006-10-12 | 2008-04-16 | 中兴通讯股份有限公司 | Synchronous control method and system for time division multiplex communication system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105764152A (en) * | 2014-12-19 | 2016-07-13 | 联想(北京)有限公司 | Information processing method and base station |
| CN105764152B (en) * | 2014-12-19 | 2020-10-27 | 联想(北京)有限公司 | Information processing method and base station |
| CN107046672A (en) * | 2016-02-05 | 2017-08-15 | 中兴通讯股份有限公司 | A kind of accidental access method and device |
| CN107094281A (en) * | 2017-03-31 | 2017-08-25 | 全球能源互联网研究院 | Cut-in method and system during a kind of M2M equipment access base station |
| CN107094281B (en) * | 2017-03-31 | 2021-05-18 | 全球能源互联网研究院 | Access method and system for M2M equipment to access base station |
| CN109729599A (en) * | 2018-12-28 | 2019-05-07 | 芯翼信息科技(上海)有限公司 | Data transmission method and data transmission system |
| CN109729599B (en) * | 2018-12-28 | 2022-09-06 | 芯翼信息科技(上海)有限公司 | Data transmission method and data transmission system |
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Address after: 201206 Shanghai, Pudong Jinqiao Ning Bridge Road, No. 388, No. Patentee after: Shanghai NOKIA Baer Limited by Share Ltd Address before: 201206 Shanghai, Pudong Jinqiao Ning Bridge Road, No. 388, No. Patentee before: Shanghai Alcatel-Lucent Co., Ltd. |