CN102291822A - Method and system for informing MTC (machine type communication) equipment of random access fallback time - Google Patents
Method and system for informing MTC (machine type communication) equipment of random access fallback time Download PDFInfo
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Abstract
The invention discloses a method and a system for informing MTC (machine type communication) equipment of random access fallback time, wherein the ME (machine type communication equipment) is informed of accessing a network by adopting the random access fallback time different from that of a common UE (user equipment). The method comprises the following steps: one or more special random access preambles are allocated to a machine type communication equipment (ME) in advance; when a base station is overloaded in a random accessing process, the base station sends a random access response media access control protocol data unit (MAC PDU) which carries a special random access response corresponding to the special random access preamble to the terminal and the special random access response comprises random access fallback time information which is special for the ME; and the ME reads the random access fallback time information in the special random access response after the ME receives the special random access response. With the adoption of the method disclosed by the invention, different random access fallback times can be fed back to a common terminal and the MTC equipment, the network congestion caused in the random accessing process for the MTC equipment is avoided.
Description
Technical field
The present invention relates to the communications field, relate generally to (Long Term Evolution based on LTE, Long Term Evolution) MTC (Machine Type Communication, Machine Type communication) rollback (Back Off be called for short BO) the time announcement method and system of the MTC equipment in the network architecture when access network at random.
Background technology
M2M (Machine to Machine (Communication), machine is to machine communication) is the notion that last century, the nineties proposed, and is the important driving force of development communication technologies.Briefly, M2M is exactly the Internet of machine, and the realization means comprise the technology of various networkings.The target of M2M technology makes all machinery equipments all possess networking and communication capacity exactly, and its core concept is exactly network all (NetworkEverything).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), lessly in this case needs human-computer interaction.Participate in the machine of MTC, be defined as MTC equipment (MTC Equipment is called for short ME).MTC equipment is MTC user's terminal, can pass through PLMN (Public Land MobileNetwork, public land mobile communications network) and communicate with other MTC equipment, MTC server.Fig. 1 is the MTC network structure under the LTE framework, and as shown in Figure 1, ME links to each other with the PLMN network by the MTC server by the terminal equipment ME of carrier network with MTC server (Server) communication, and the MTC server provides service for MTC user.E-UTRAN among the figure (Evolved-Universal Terrestrial Radio Access Network) is an Evolved UTRAN, MME (Mobility Management Entity) is a Mobility Management Entity, SGW (Serving Gateway) is a gateway, PGW (PDN Gateway) is a packet data gateway, and HSS (Home Subscriber Server) is a home subscriber server.
Inserting at random is a most basic function of terminal in the wireless communication system, and it connects terminal and network becomes possibility.Just as its name, the initiation of such access and the resource of employing have randomness, insert certainly successfully also to have randomness.Have access to two kinds of patterns at random: based on competitive mode with based on non-competing pattern.The flow process of the random access procedure of these two kinds of patterns is different, is applicable to different scenes.
Be suitable in the application process below of access at random based on competitive mode: the initial access under RRC (radio resource control) idle condition; The Radio Link later initial access that makes mistakes; Under the RRC connection status, when transmitting uplink data.
Be suitable for based on inserting at random in below the application process of non-competing pattern: under the RRC_CONNECTED state, when descending when transfer of data is arranged; The random access procedure of terminal in handoff procedure.
As shown in Figure 2, the access at random based on competitive mode is divided into four steps:
Step 1, transmission comprise RACH (Random AccessChannel, the Random Access Channel) request of random access guiding (preamble); UE (User Equipment, subscriber equipment) before initiating to insert request at random, from the available send opportunity of access at random, select a send opportunity at random, equiprobablely from the set of available lead code select a lead code at random and selected lead code is sent to the base station.
Step 2, accidental access response (Random Access Reponse is hereinafter to be referred as RAR) message; ENB (Evolved NodeB, evolved base station) sends random access feedback messages, i.e. RAR message to UE.ENB certain insert at random correctly solve one or more lead code on the send opportunity after, calculate corresponding RA-RNTI (Random Access-Radio NetworkTemporary Identifier, random access radio network temporary mark) according to send opportunity.According to these information generations accidental access response MAC PDU (Media Access Control Protocol Data Unit as shown in Figure 3, media access control protocol data unit), as shown in Figure 3, son head in the MAC head and the RAR field domain in the payload are one to one.The form of MAC RAR as shown in Figure 4, comprise reserved place (1bit), time order in advance, up permission (UL Grant) and interim C-RNTI (Cell Radio NetworkTemporary Identifier, Cell Radio Network Temporary Identifier/Identity, Cell-RNTI).In addition, eNB also can judge whether to add the sub-head of rollback according to the current load state that inserts at random in accidental access response MAC PDU, carried the rollback time in the rollback head.It is not carry out in the available access chance at random of the next one immediately that lead code is counter to be sent when random access collision takes place that its effect is to use the family, send lead code but delay to retransmit again when keeping out of the way through one section, thereby reduces the probability that bumps between the user.
Step 3, terminal recognition; UE sends the RRC message of band user ID to eNB.When a plurality of UE select identical lead code to send at identical send opportunity in the first step, so in step 2 random challenge message have a plurality of UE and receive.These UE have identical C-RNTI.Comprise in the RRC message so can unique identification different UEs identification information.
Step 4, competition are eliminated; ENB sends collision and solves message.In same uplink authorization, send the RRC message of oneself simultaneously owing to have a plurality of UE, eNB therefrom correctly demodulates the RRC message of a UE, at PDCCH (Physical Downlink Control Channel, Physical Downlink Control Channel) goes up the transmission collision and solve message, carry out scrambling to solving the corresponding PDCCH content of message with the C-RNTI of the UE that comprises in the RRC message, and carry the identification information of the successful UE of access with collision.This collision solves whether message is oneself to UE according to identification information judgment, if, then adopt one's own C-RNTI to receive PDCCH, if can correctly receive PDCCH, then think and insert successfully at random.
In random access procedure, there is following several situation can adopt fallback mechanism.A kind of is that accidental access response is unusual, if be exactly UE does not receive the leading correspondence of its transmission in accidental access response RAP ID (random access guiding sign) specifically, does not perhaps receive accidental access response in certain time length.Another situation is exactly described in top step 2, produces collision in the UE random access procedure, and access failure at random appears in some UE.In addition, be in when system under the situation of overload, its resource that the more RRC of transmission message uses or the like of can't reallocating for example, this time, it wished that naturally some UE can postpone a period of time transmission RACH request, by rollback (Back Off in receiving random access response and inside accidental access response message (RAR message) form, be called for short BO) the parameter realization, this parameter is exactly the parameter of fallback mechanism, find to have a BO indication if monitor the UE of RAR message, it will preserve this value get up so, need subsequently to do again at random insert in, select a value as the time of postponing a targeting sequencing in 0 to the BO value at random.In the prior art, rollback time parameter unit is a millisecond, can select one from following 12 values: 0,20,30,40,60,80,120,160,240,320,480,960.It is that the base station is determined according to the load of machinery systems that the base station sends to the BO parameter of carrying in the accidental access response message of terminal, all adopts same BO parameter for the terminal that inserts in a Serving cell.
Terminal quantity in the MTC network is numerous, initiates to insert at random request simultaneously when being linked into network when great amount of terminals, and the resource in the network is not enough, and access failure can take place a large amount of MTC equipment, therefore can insert again in the time at BO.A large amount of at short notice MTC equipment initiate to insert at random request, also can cause the congestion situation in the network.Stipulated that such as the electricity meter-reading business MTC equipment sends data in certain specific time to network, needs these terminals to be linked into network simultaneously at special time.When a large amount of MTC equipment were linked into network simultaneously, the likelihood ratio that random access collision takes place was bigger, and access failure at random can appear in a large amount of MTC equipment, these at random the ME of access failure also can be linked into network again.Be linked into network in short time network is caused the basic situation of gathering around in order to alleviate a large amount of ME, need the long BO time.MTC equipment selects a time to be linked into network again at long BO in the time.But in order not influence ordinary terminal user's quality of service, if ordinary terminal generation random access collision need be linked into network usually as early as possible, the BO time of obtaining in the answering than short is just enough inserting at random.On the other hand, in some application scenarios, when MTC equipment had time sensitivity, MTC equipment had the access priority higher than common UE, and this moment, MTC equipment was linked into network fast, needed to obtain the BO time littler than common UE.When ordinary terminal and MTC equipment when a Serving cell is linked into network, the base station can the distinguishing terminal type send to insert at random to terminal replys MAC PDU.The RACH RAR that sends at different terminals inserts among the response message MAC PDU at random same, and the BO time of wherein carrying also is the same, and ordinary terminal can't get access to the different rollback time with MTC equipment.MTC equipment for realizing different business also needs the different rollback time of access at random, but prior art can't realize that also the base station is at the different BO time of different business feedback.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of MTC equipment and inserts rollback time announcement method and system at random, and notice ME adopts be linked into network the rollback time of access at random that is different from common UE.
For solving the problems of the technologies described above, the invention provides a kind of MTC equipment and insert rollback time announcement method at random, comprising:
Be that Machine Type communication equipment (ME) is divided one or more special-purpose random access guidings in advance;
In random access procedure, when overloaded base stations, the access at random that described base station sends to terminal is replied the special use of carrying in the medium Access Layer Packet Data Unit (MAC PDU) corresponding to described special-purpose random access guiding and is inserted at random and reply, and comprises the rollback of the access at random temporal information of ME special use during described special use inserts at random and replys;
ME receive described special use insert at random reply after, read the rollback of access at random temporal information wherein.
Further, described method further comprises: divide a plurality of special-purpose random access guidings in advance; In random access procedure, ME uses any initiation in the described special-purpose random access guiding to insert at random, when the base station is in overload, after the random access guiding that use according to terminal described base station judges that described terminal is as ME, reply inserting at random of sending to terminal and to carry the corresponding special use of being adopted with described ME of special-purpose random access guiding among the MAC PDU and insert at random and reply, described special use inserts at random replys the rollback of the access at random temporal information that is included as the special use that ME is provided with; Described ME reads the special use corresponding with its special-purpose random access guiding that adopts and inserts at random and reply, and obtains and inserts the rollback temporal information at random.
Further, describedly carry the corresponding special use of being adopted with described ME of special-purpose random access guiding among the MAC PDU and insert the method for replying at random and comprise inserting at random to reply: increase a corresponding special use of the special-purpose random access guiding that is adopted with described ME among the MAC PDU and insert at random and reply inserting at random to reply, insert at random in described special use and carry the described rollback temporal information that inserts at random in replying; Perhaps increase the corresponding special use of special-purpose random access guiding that a plurality of and described ME adopted among the MAC PDU and insert at random and reply inserting at random to reply, each special use inserts the rollback of the access at random temporal information of replying the special use of carrying ME category information and such ME correspondence at random, and described ME category information comprises one of following information: type of service sign, access priority, ME group id.
Further, also carry in the following content one or several during described special use inserts at random and replys, be used to make ME to discern this special use and insert at random to reply and issue oneself: Cell Radio Network Temporary Identifier/Identity, Cell-RNTI, random access guiding sign (RAP ID).
Further, comprise a specific identity information during described special use inserts at random and replys, be used to notify this special use of ME to insert at random and reply the rollback of the access at random temporal information that is used to carry the ME special use.
Further, described step of dividing a plurality of special-purpose random access guidings in advance comprises: the random access guiding scope of dividing a special use for all ME; Perhaps be that different classes of ME divides different random access guiding scopes in advance,, belong to same group the ME or the ME of same type of service or the ME of same access priority and belong to same classification as special-purpose random access guiding separately.
Further, described method further comprises: set in advance one or more special-purpose random access guidings; In random access procedure, when the base station is in overload, described base station is replied in described access at random and is carried the special-purpose sub-head corresponding with described special-purpose random access guiding among the MAC PDU, and a special use corresponding with described special-purpose son head insert at random and reply, and is included as the rollback of the access at random temporal information of the special use of ME setting during described special use inserts at random and replys; Described ME reads the corresponding special use of described special-purpose son head and inserts at random and reply, and obtains and inserts the rollback temporal information at random.
Further, described special use comprises in inserting at random and replying: the rollback of the access at random temporal information of the special use of ME category information and such ME correspondence, described ME category information comprises one of following information: ME group id, type of service sign, access priority.
Further, described newly-increased special use inserts at random to reply and is positioned at original the access at random and replys before the MACRAR.
Further, the described adjustable length of replying MAC PDU and/or described special-purpose random access guiding that inserts at random.
Further, the described rollback temporal information that inserts at random is for inserting the rollback time at random, described ME read described insert the rollback temporal information at random after, directly know oneself rollback time of access at random, according to the described rollback time re-accessing network that inserts at random.
Further, the described rollback temporal information that inserts at random is for adjusting the factor, described ME read described insert the rollback temporal information at random after, know oneself rollback time of access at random by calculating, according to the described rollback time re-accessing network that inserts at random.
Further, the described adjustment factor is scale parameter or side-play amount; When the described adjustment factor is scale parameter, describedly be calculated as multiply operation; When the described adjustment factor is side-play amount, describedly be calculated as add operation.
For solving the problems of the technologies described above, the present invention also provides a kind of MTC equipment to insert rollback time announcement system at random, comprising: base station and Machine Type communication equipment (ME), wherein:
Described base station comprises special-purpose leading division module, rollback time sending module, wherein:
The leading division module of described special use is used for dividing one or more special-purpose random access guidings for Machine Type communication equipment (ME) in advance;
Described rollback time sending module, be used at random access procedure, when the base station is in overload, reply the special use of carrying in the medium Access Layer Packet Data Unit (MAC PDU) corresponding to described special-purpose random access guiding in the access at random that sends to terminal and insert at random and reply, comprise the rollback of the access at random temporal information of ME special use during described special use inserts at random and replys;
Described ME comprises rollback time receiver module, wherein:
Described rollback time receiver module, be used for receive described special use insert at random reply after, read the rollback of access at random temporal information wherein.
Further, the special-purpose leading division module of described base station is further used for dividing a plurality of special-purpose random access guidings for ME in advance;
Described ME also comprises and inserts initiation module at random, its be used for using described special-purpose random access guiding any initiate to insert at random;
The rollback time sending module of described base station, be further used in random access procedure, random access guiding in the access at random that judgement receives is any in the described special-purpose random access guiding, and when described base station is in overload, reply inserting at random of sending to terminal and to carry the corresponding special use of being adopted with described ME of special-purpose random access guiding among the MAC PDU and insert at random and reply, described special use inserts at random replys the rollback of the access at random temporal information that is included as the special use that ME is provided with;
The rollback time receiver module of described ME, be further used for receive described special use insert at random reply after, read the rollback of access at random temporal information wherein.
Further, described rollback time sending module, be further used for: increase a corresponding special use of the special-purpose random access guiding that is adopted with described ME among the MACPDU and insert at random and reply inserting at random to reply, insert at random in described special use and carry the described rollback temporal information that inserts at random in replying; Perhaps increase the corresponding special use of special-purpose random access guiding that a plurality of and described ME adopted among the MAC PDU and insert at random and reply inserting at random to reply, each special use inserts the rollback of the access at random temporal information of replying the special use of carrying ME category information and such ME correspondence at random, and described ME category information comprises one of following information: type of service sign, access priority, ME group id.
Further, the leading division module of described special use is further used for: the random access guiding scope of dividing a special use for all ME; Perhaps be that different classes of ME divides different random access guiding scopes in advance,, belong to same group the ME or the ME of same type of service or the ME of same access priority and belong to same classification as special-purpose random access guiding separately.
Further, the special-purpose leading division module of described base station is further used for for ME one or more special-purpose random access guidings being set in advance;
The rollback time sending module of described base station, be further used in random access procedure, when the base station is in overload, described base station is replied in described access at random and is carried the special-purpose sub-head corresponding with described special-purpose random access guiding among the MAC PDU, and a special use corresponding with described special-purpose son head insert at random and reply, and is included as the rollback of the access at random temporal information of the special use of ME setting during described special use inserts at random and replys;
The rollback time receiver module of described ME, the special use of further reading described special-purpose son head correspondence inserts at random replys, and obtains and inserts the rollback temporal information at random.
Further, described special use comprises in inserting at random and replying: the rollback of the access at random temporal information of the special use of ME category information and such ME correspondence, described ME category information comprises one of following information: ME group id, type of service sign, access priority.
Adopt the method for the invention, can be at ordinary terminal and the different rollback time of access at random of MTC equipment feedback, the network congestion of avoiding MTC equipment in random access procedure, to cause.
Description of drawings
Fig. 1 is based on the MTC network architecture diagram of LTE;
Fig. 2 is the random access procedure flow chart;
Fig. 3 is the structural representation that inserts response message MAC PDU at random;
Fig. 4 is the structural representation that inserts MAC RAR in the response message at random;
Fig. 5 is the schematic flow sheet of embodiment of the invention correspondence;
Fig. 6 is the MAC PDU structure chart of embodiment one correspondence among the present invention;
Fig. 7 is the MAC RAR structure chart of embodiment one correspondence among the present invention;
Fig. 8 is random access guiding and MAC RAR corresponding relation schematic diagram;
Fig. 9 is the MAC PDU structure chart of embodiment two correspondences among the present invention;
Figure 10 is a MAC RAR structural representation among the embodiment two among the present invention;
Figure 11 is a MAC RAR structural representation in the embodiment of the invention two;
Figure 12 is an extended MAC RAR structural representation in the embodiment of the invention two;
Figure 13 is a MAC PDU structural representation in the embodiment of the invention two.
Embodiment
Inventive concept of the present invention is: divide one or more special-purpose random access guidings for Machine Type communication equipment (ME) in advance; In random access procedure, when overloaded base stations, the access at random that described base station sends to terminal is replied the special use of carrying in the medium Access Layer Packet Data Unit (MAC PDU) corresponding to described special-purpose random access guiding and is inserted at random and reply, and comprises the rollback of the access at random temporal information of ME special use during described special use inserts at random and replys; ME receive described special use insert at random reply after, read the rollback of access at random temporal information wherein.
ME read described insert the rollback temporal information at random after, directly know or know oneself rollback time of access at random, according to the described rollback time re-accessing network that inserts at random by calculating.
Above-mentioned access is at random replied MAC PDU and can be abbreviated MAC PDU as; Access is replied MACRAR and can be abbreviated MAC RAR as at random.
Particularly, comprise one of following method:
Method one:
Divide a plurality of special-purpose random access guidings (preamble) in advance; In random access procedure, ME uses any initiation in the described special-purpose random access guiding to insert at random, when the base station is in overload, after the random access guiding that use according to terminal described base station judges that described terminal is as ME, reply inserting at random of sending to terminal and to carry the corresponding special use of being adopted with described ME of special-purpose random access guiding among the MAC PDU and insert at random and reply, described special use inserts at random replys the rollback of the access at random temporal information that is included as the special use that ME is provided with; Described ME reads the special use corresponding with its special-purpose random access guiding that adopts and inserts at random and reply, and obtains and inserts the rollback temporal information at random.
Particularly, described " insert at random reply carry among the MAC PDU the corresponding special use of being adopted with described ME of special-purpose random access guiding insert at random reply " step comprise:
Increase a corresponding special use of the special-purpose random access guiding that is adopted with described ME among the MAC PDU and insert at random and reply inserting at random to reply, insert at random in described special use and carry the described rollback temporal information that inserts at random in replying; Perhaps
Increase the corresponding special use of special-purpose random access guiding that a plurality of and described ME adopted among the MAC PDU and insert at random and reply inserting at random to reply, each special use inserts the rollback of the access at random temporal information of replying the special use of carrying ME category information and such ME correspondence at random, and described ME category information comprises one of following information: type of service sign (Service ID), access priority (Access Priority), ME group id (Group ID).The special-purpose random access guiding that inhomogeneous ME is corresponding different returns different BO temporal informations as different ME.
Certain class MTC terminal can be meant to have same type of service, perhaps same access priority, perhaps belong to same group ME (can divide into groups according to CAMEL-Subscription-Information or regional feature), corresponding ME category information can be: type of service sign or access priority or group id.
Special-purpose insert at random to reply need carry in the following content one or several among the MAC RAR so that ME discern this insert at random reply MAC RAR to oneself: C-RNTI, RAP ID.RAP ID in the son head of this RAPID and this ME is consistent.
Because for ME has divided special-purpose random access guiding scope, that the base station can be inserted at random according to the preamble judgement initiation during access is asked at random is common UE or ME, can in response message, return the BO time or adjust the factor so, thereby avoid ME to adopt the identical BO time with common UE at ME.Preferably, can divide the random access guiding scope of a special use for all ME; Perhaps, be that different classes of ME divides different random access guiding scopes in advance, as special-purpose random access guiding separately, belong to same group the ME or the ME of same type of service or the ME of same access priority and belong to same classification.
In the method, for inserting response message at random, only insert at random and reply MAC RAR inserting at random to reply to increase in the MAC PDU payload with the pairing special use of the son head of described ME (i.e. the son that the special-purpose random access guiding that uses with ME is corresponding), inserting the son head of this ME that replys among the MAC PDU does not at random change, just this child head can corresponding a plurality ofly insert at random and reply MAC RAR, comprise that the access at random of carrying normal content in the prior art replys MAC RAR, and the special use that increases newly of the present invention inserts at random and replys MAC RAR.For ME, ME replys the MAC RAR except reading the access at random of carrying normal content, also needs to read newly-increased one or more special uses and inserts at random and reply MAC RAR.
Method two:
Set in advance one or more special-purpose random access guidings; In random access procedure, when the base station is in overload, described base station is replied in described access at random and is carried the special-purpose sub-head corresponding with described special-purpose random access guiding among the MAC PDU, and a special use corresponding with described special-purpose son head insert at random and reply, and is included as the rollback of the access at random temporal information of the special use of ME setting during described special use inserts at random and replys; Described ME reads the corresponding special use of described special-purpose son head and inserts at random and reply, and obtains and inserts the rollback temporal information at random.
Preferably, described special use comprises in inserting at random and replying: the rollback of the access at random temporal information of the special use of ME category information and such ME correspondence, described ME category information comprises one of following information: ME group id, type of service sign, access priority.
When described special-purpose random access guiding has when a plurality of, special-purpose son head and the special use separately of each special-purpose random access guiding correspondence inserts at random and replys.
When needs carry more contents, can expand MAC PDU and/or special-purpose random access guiding, for example adjust the length that it takies.
Preferably, in above-mentioned two methods, newly-increased special use inserts at random replys MAC RAR and is positioned at original the access at random and replys before the MAC RAR, and promptly all insert at random and reply the last of MAC RAR, fill before the field.
The rollback of access at random temporal information in above-mentioned two methods comprises and inserts the rollback time at random or adjust the factor.The described rollback temporal information that inserts at random is for inserting rollback at random during the time, described ME read described insert the rollback temporal information at random after, directly know oneself rollback time of access at random, according to the described rollback time re-accessing network that inserts at random.The described rollback temporal information that inserts at random when adjusting the factor, described ME read described insert the rollback temporal information at random after, know oneself rollback time of access at random by calculating, according to the described rollback time re-accessing network that inserts at random.
The above-mentioned adjustment factor can be a scale parameter or side-play amount.When the described adjustment factor is scale parameter, describedly be calculated as multiply operation; When the described adjustment factor is side-play amount, describedly be calculated as add operation.Particularly, adjusting the factor can be a scale parameter, and this moment, the ME executable operations can be that the BO time is done multiply operation according to adjusting the factor; Adjusting the factor also can be a side-play amount, and this moment, ME can do add operation according to side-play amount to the BO time.Described side-play amount is the difference of BO between the time of special-purpose BO time of ME and common UE, and ME can reply the BO time that MAC PDU rollback head is known common UE by inserting at random, again according to above-mentioned side-play amount, can know the rollback time of access at random of oneself.
Realize the reporting system of said method, comprising: base station and ME, wherein:
Described base station comprises special-purpose leading division module, rollback time sending module, wherein:
The leading division module of described special use is used for dividing one or more special-purpose random access guidings for ME in advance;
Described rollback time sending module, be used at random access procedure, when the base station is in overload, reply the special use of carrying among the MAC PDU corresponding to described special-purpose random access guiding inserting at random of sending to terminal and insert at random and reply, comprise the rollback of the access at random temporal information of ME special use during described special use inserts at random and replys;
Described ME comprises rollback time receiver module, wherein:
Described rollback time receiver module, be used for receive described special use insert at random reply after, read the rollback of access at random temporal information wherein.
At said method one, preferably:
The special-purpose leading division module of described base station is further used for dividing a plurality of special-purpose random access guidings for ME in advance;
Described ME also comprises and inserts initiation module at random, its be used for using described special-purpose random access guiding any initiate to insert at random;
The rollback time sending module of described base station, be further used in random access procedure, random access guiding in the access at random that judgement receives is any in the described special-purpose random access guiding, and when described base station is in overload, reply inserting at random of sending to terminal and to carry the corresponding special use of being adopted with described ME of special-purpose random access guiding among the MAC PDU and insert at random and reply, described special use inserts at random replys the rollback of the access at random temporal information that is included as the special use that ME is provided with;
The rollback time receiver module of described ME, be further used for receive described special use insert at random reply after, read the rollback of access at random temporal information wherein.
Preferably, described rollback time sending module is further used for:
Increase a corresponding special use of the special-purpose random access guiding that is adopted with described ME among the MAC PDU and insert at random and reply inserting at random to reply, insert at random in described special use and carry the described rollback temporal information that inserts at random in replying; Perhaps
Increase the corresponding special use of special-purpose random access guiding that a plurality of and described ME adopted among the MAC PDU and insert at random and reply inserting at random to reply, each special use inserts the rollback of the access at random temporal information of replying the special use of carrying ME category information and such ME correspondence at random, and described ME category information comprises one of following information: type of service sign, access priority, ME group id.
Preferably, the leading division module of described special use is further used for:
Divide the random access guiding scope of a special use for all ME; Perhaps
Be that different classes of ME divides different random access guiding scopes in advance,, belong to same group the ME or the ME of same type of service or the ME of same access priority and belong to same classification as special-purpose random access guiding separately.
At said method two, preferably:
The special-purpose leading division module of described base station is further used for for ME one or more special-purpose random access guidings being set in advance;
The rollback time sending module of described base station, be further used in random access procedure, when the base station is in overload, described base station is replied in described access at random and is carried the special-purpose sub-head corresponding with described special-purpose random access guiding among the MAC PDU, and a special use corresponding with described special-purpose son head insert at random and reply, and is included as the rollback of the access at random temporal information of the special use of ME setting during described special use inserts at random and replys;
The rollback time receiver module of described ME, the special use of further reading described special-purpose son head correspondence inserts at random replys, and obtains and inserts the rollback temporal information at random.
Preferably, described special use comprises in inserting at random and replying: the rollback of the access at random temporal information of the special use of ME category information and such ME correspondence, described ME category information comprises one of following information: ME group id, type of service sign, access priority.
Below in conjunction with access process at random and insert at random reply MAC PDU and at random access reply MAC RAR block diagram illustrating several specific embodiments of the present invention.
At first describe in conjunction with 5 pairs of two access process at random that embodiment was suitable for of the present invention of Figure of description, the access process at random that the present invention uses mainly may further comprise the steps:
Step 1, ME need be linked into network, adopts the accidental access method of competition, and ME sends the request that inserts at random to the base station, carries random access guiding in the message;
The trigger condition that ME initiates to insert at random has multiple, may be the triggering message of having received that network side sends, or the ME triggering that powers on.ME selects a send opportunity at random from the available send opportunity of access at random, on this send opportunity, ME sends the request that inserts at random to the base station, carries random access guiding (preamble) in the message;
Step 2, after the base station has been received and has been inserted request at random in a large number, the base station judges whether that according to the disposal ability of self enough resource processing insert request at random, if overload conditions appears in the base station, need to carry common UE in the response message and initiate the rollback time range that inserts at random again inserting at random so;
Step 3, base station are returned to insert at random and are replied MAC PDU, have wherein carried the rollback time of inserting at random;
In the present invention, except the BO time that common UE uses, also comprise the BO time of ME special use in the message or adjust factor information; The method of carrying the BO time or the adjustment factor in the message is referring to the following examples.
Step 4, ME judges whether to initiate random access procedure again, and is unusual if the MACRAR that ME receives occurs, and do not receive MAC RAR at oneself such as carrying RAP ID or terminal among the MAC RAR, and terminal can be initiated random access procedure again.If ME and other terminal have adopted same preamble, will produce collision so, the terminal situation of access failure at random can appear, and ME also can initiate to be linked at random the process of network again in this case.
Step 5, ME initiates random access procedure again.
If ME determine to need to initiate again to insert at random, according to the special-purpose BO time of the ME that carries in the random challenge message or adjust factor information and determine to initiate again rollback time of inserting at random, initiate again to insert at random in the rollback time of determining.If what ME received is to adjust the factor, ME carries out and adjusts operation can be that the BO time of access at random of common UE is done multiply operation according to adjusting the factor.If base station overload, the BO time that needs ME is greater than common UE, then the base station scale factor is set to the value greater than 1, otherwise it is higher to work as the ME access priority, need be than the quicker access of common UE, then the base station scale factor is set to the value less than 1, and the size of concrete value is determined according to local load condition by the base station; Adjusting the factor also can be a side-play amount, this moment, ME can do add operation according to side-play amount to the BO time, if base station overload, the BO time that needs ME is greater than common UE, side-play amount be set on the occasion of, otherwise when the ME access priority higher, need be than the quicker access of common UE, can be set to negative value, be equivalent to do subtraction this moment, the size of concrete value is determined according to local load condition by the base station.
First embodiment
Present embodiment adopts said method one, is that specially the default random access guiding set of ME, these random access guidings can be from existing 64 parts that mark off leading, also can be that the lead code that increases newly is gathered.
In Fig. 5 step 1, ME sends and inserts the lead code of carrying the special use that is provided with into ME in the request at random; After the access at random request that ME sends has been received in the base station, according to the information of default leading set with insert the lead code of carrying in the request at random and can judge that to insert request at random be the ME transmission.
In Fig. 5 step 3, the base station is being inserted the BO time of carrying the ME special use in the response message at random or is being adjusted the factor.Because each field domain has all had concrete implication among the MAC RAR of the prior art, is inconvenient to expand.In order to carry the BO time by RAR or to adjust the factor, need increase the MAC RAR of a correspondence for RAP ID, corresponding MAC PDU structure as shown in Figure 6, corresponding two MAC RAR of MAC head in the present embodiment, one of them is the MAC RAR of shape such as Fig. 4 form in the prior art, and one is that being used for of increasing newly transmitted the BO time or adjusted the special-purpose MACRAR of the factor.The special-purpose BO time of described ME or the adjustment factor place newly-increased MAC RAR.
The data volume size of MARRAR is fixed in the prior art, and UE goes out corresponding MAC RAR position according to MAC position calculation, and the byte of the MAC RAR position of decoding corresponding position just can obtain the content of access response message at random of required correspondence.Preferably, in the present embodiment, misread newly-increased special-purpose MAC RAR, this special use MAC RAR is placed the back of all MACRAR in order to prevent terminal.As shown in Figure 6, one is inserted at random and replys MAC PDU and 4 sub-heads are arranged, 5 MAC RAR, son 3 a corresponding newly-increased special-purpose MACRAR that are used for transmitting the BO time or adjust the factor.Should place after four MAC RAR by newly-increased MAC RAR.Preferably, newly-increased MAC RAR byte number is identical with MAC RAR byte number in the prior art, the content difference.At least carry the special-purpose BO time of ME among the newly-increased MAC RAR or adjust the factor.Optionally, when newly-increased a plurality of MAC RAR, can comprise following content among each newly-increased MAC RAR: the rollback of the access at random temporal information of the special use of ME category information and such ME correspondence, the concrete structure of MAC RAR as shown in Figure 7, described ME category information comprises one of following information: type of service sign (Service ID), access priority (AccessPriority), ME group id (Group ID).Preferably, also comprise among the newly-increased MAC RAR and be used to discern the identification information (C-RNTI and/or RAPID) of this MAC RAR for the MAC RAR of this ME.
In Fig. 5 step 4, after ME has received and inserted response message at random, can have several method to go to read the BO time or the adjustment factor:
1) make an appointment ME receive insert response message at random after, need read the BO time or adjust factor information.
2) in order to distinguish the function with the corresponding different MAC RAR of same MAC head, the base station increases specific identity information in newly-increased MAC RAR, being used to identify this MAC RAR is to be used for carrying the BO time of ME special use or to adjust factor information, ME reads after this specific identity information as can be known that this MACRAR sends to oneself, then reads the BO time of carrying among this RAR or adjusts the factor.
3) in order to distinguish newly-increased MAC RAR and other MAC RAR, except BO time or adjustment factor information, the base station can also increase the RAPID field domain in newly-increased MAC RAR, ME reads RAPID information in MACRAR just be leading BO time or the adjustment factor corresponding with it as can be known.Newly-increased MAC RAR form can be but be not limited to shown in Figure 7.
What need further specify is in the step 3, behind first MAC RAR of RAPID correspondence, can obtain interim C-RNTI in ME has read with sub in Fig. 5.After ME has read second MAC RAR with above-mentioned RAPID correspondence, can learn that according to the identification information shown in Fig. 7 this RAR is used for transmitting the BO time specially or adjusts the factor, whether mate according to the C-RNTI among C-RNTI among the RAR and the RAR that receives before and can learn the BO time or the adjustment factor of whether carrying oneself among this RAR.Perhaps the RAP id information in the corresponding son head can be carried in the base station in RAR, and ME reads and learns that what carry among the RAR is oneself BO time or adjustment factor information behind the RAP id information in the MAC head.Common UE only reads and the corresponding RAR of own son head, ignores newly-increased MAC RAR.
What need further specify is, if the random access guiding at random that carries in Fig. 5 step 1 is certain ME classification special use, inserting the BO time that to carry such ME special use in the response message at random or adjusting the factor so, in above-mentioned newly-increased MAC RAR, can increase the identification information of such ME, such as Group ID, this moment, Group ID was as a field domain information among the MAC RAR.Preferably, the base station can be adopted the different B O rollback time or be adjusted the factor at the ME terminal of different service types or access priority, correspondingly, can increase service identification or access priority as the ME category information in above-mentioned newly-increased MAC RAR.
What need further specify is, can expand MAC PDU and MAC RAR according to the demand, and structure chart can be referring to Fig. 6 and Fig. 7, and newly-increased MAC RAR places after all MAC RAR that do not expand.
Second embodiment
In the present embodiment, adopt said method two, in order in MAC RAR, to carry the ME rollback time, default specially special-purpose random access guiding, this special use random access guiding can be the part that marks off from existing 64 lead codes set, also can be increase newly leading.Described default random access guiding can corresponding all ME, and perhaps certain ME group (dividing into groups according to CAMEL-Subscription-Information or region) perhaps realizes the ME that certain is professional, perhaps the ME of certain access priority.Carry the special-purpose BO time or adjust inserting at random of the factor and reply MAC RAR and described default special-purpose random access guiding correspondence, terminal is not chosen default random access guiding when access network at random.Special-purpose RAPID corresponding with described special-purpose random access guiding and corresponding special-purpose MAC head and special-purpose MAC RAR are carried in the base station in inserting response message MAC PDU at random, corresponding relation as shown in Figure 8.
In the step 1, ME sends the request that inserts at random to the base station in Fig. 5.After the request of access at random of terminal transmission had been received in the base station, the special-purpose RAPID and the special-purpose sub-head of setting and the leading correspondence of above-mentioned default special use fed back to terminal by inserting response message in Fig. 5 step 2 at random in inserting the son head of replying MAC PDU at random.When terminal reads RAP id information in the MAC head, common UE ignores the special-purpose MAC head at special-purpose RAP ID place and the special-purpose MAC RAR of correspondence.After ME reads the RAP id information, learn that this RAP ID place corresponding MAC RAR of son head is used for transmitting the BO time specially or adjusts factor range, obtains the special-purpose BO time or adjusts the factor by reading corresponding MAC RAR content.
In the present embodiment, can have multiple MAC PDU and MAC RAR structure to be used to transmit the BO time or the adjustment factor:
1) corresponding with this method MAC PDU structure such as Fig. 9 illustrate, but are not limited to structure shown in Figure 9.In Fig. 9, MAC 3 is the special-purpose MAC heads with the leading correspondence of described default special use.Carry the BO time of ME special use among the corresponding MAC RAR3 or adjust the factor, MAC RAR form adopts multiple, and wherein a kind of can be as shown in figure 10, wherein only carries the BO time or adjusts the factor.
2) for the ME packet equipment, MAC PDU structure such as the Fig. 9 corresponding with this method illustrate, but are not limited to structure shown in Figure 9.In inserting the special-purpose MAC RAR of response message at random, carry the special-purpose BO time of MTC grouping or adjust the factor, can also carry corresponding Group ID (group character).Corresponding MAC PDU form and MAC RAR can be shown in Fig. 9 and 11, but are not limited to the form among Fig. 9 and Figure 11.Each special-purpose MAC RAR can carry the information of two ME groupings at least, for each ME grouping, comprises the group id and the corresponding BO temporal information of this grouping of this grouping.
Preferably, for the BO time or the adjustment factor of carrying a plurality of ME groupings in special-purpose MAC RAR, can expand size and the form of special-purpose MAC RAR, the special-purpose MACRAR form after the expansion can be as shown in figure 12.Special-purpose MAC RAR after the expansion can take the position of a plurality of MACRAR, in order to prevent that common UE from misreading this extended MAC RAR content, this extended MAC RAR need be placed after all MAC RAR positions, accordingly, the corresponding son head of this extended MAC RAR also need be placed after all sub, corresponding MAC PDU structure chart as shown in figure 13.
Wherein the ME packet equipment is meant: according to the portable terminal of contracting or the distribution group sign belongs to the member of certain group dynamically, at this moment, this portable terminal has group identification information (Group ID).
Be that example describes with the ME group only, when carrying out the branch time-like with type of service or priority, method is similar, repeats no more herein herein
3) base station can be adopted the different B O rollback time or adjust the factor at inhomogeneity (group or type of service or access priority) ME terminal.In inserting the special-purpose MAC RAR of response message at random, can carry the BO time of inhomogeneity ME special use or adjust the factor, and corresponding category information, comprise group id or type of service sign or access priority.MAC PDU form is referring to Fig. 9, and MAC RAR form can be referring to 11, at least the BO temporal information of portability two class ME.Certainly also be not limited to the form among Fig. 9 and Figure 11.For example, for the BO time or the adjustment factor that sends a plurality of ME classes in special-purpose MAC RAR, can all expand size and the form of MAC RAR, the special-purpose MAC RAR form after the expansion can be referring to Figure 12.Special-purpose MAC RAR after the expansion can take the position of a plurality of MACRAR, in order to prevent that common UE from misreading MAC RAR content, need be with after all the MAC RAR positions in the corresponding MAC PDU head of MAC RAR, accordingly, need be also after all son heads with corresponding son head, corresponding MAC PDU structure chart is as shown in figure 13.
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to finish by program, described program can be stored in the computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each module in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (19)
1. a MTC equipment inserts rollback time announcement method at random, comprising:
Be that Machine Type communication equipment (ME) is divided one or more special-purpose random access guidings in advance;
In random access procedure, when overloaded base stations, the access at random that described base station sends to terminal is replied the special use of carrying in the medium Access Layer Packet Data Unit (MAC PDU) corresponding to described special-purpose random access guiding and is inserted at random and reply, and comprises the rollback of the access at random temporal information of ME special use during described special use inserts at random and replys;
ME receive described special use insert at random reply after, read the rollback of access at random temporal information wherein.
2. the method for claim 1 is characterized in that, described method further comprises:
Divide a plurality of special-purpose random access guidings in advance;
In random access procedure, ME uses any initiation in the described special-purpose random access guiding to insert at random, when the base station is in overload, after the random access guiding that use according to terminal described base station judges that described terminal is as ME, reply inserting at random of sending to terminal and to carry the corresponding special use of being adopted with described ME of special-purpose random access guiding among the MAC PDU and insert at random and reply, described special use inserts at random replys the rollback of the access at random temporal information that is included as the special use that ME is provided with;
Described ME reads the special use corresponding with its special-purpose random access guiding that adopts and inserts at random and reply, and obtains and inserts the rollback temporal information at random.
3. method as claimed in claim 2 is characterized in that, describedly carries the corresponding special use of being adopted with described ME of special-purpose random access guiding among the MACPDU and inserts the method for replying at random and comprise inserting at random to reply:
Increase a corresponding special use of the special-purpose random access guiding that is adopted with described ME among the MAC PDU and insert at random and reply inserting at random to reply, insert at random in described special use and carry the described rollback temporal information that inserts at random in replying; Perhaps
Increase the corresponding special use of special-purpose random access guiding that a plurality of and described ME adopted among the MAC PDU and insert at random and reply inserting at random to reply, each special use inserts the rollback of the access at random temporal information of replying the special use of carrying ME category information and such ME correspondence at random, and described ME category information comprises one of following information: type of service sign, access priority, ME group id.
4. method as claimed in claim 3 is characterized in that,
Also carry in the following content one or several during described special use inserts at random and replys, be used to make ME to discern this special use and insert at random to reply and issue oneself: Cell Radio Network Temporary Identifier/Identity, Cell-RNTI, random access guiding sign (RAP ID).
5. method as claimed in claim 3 is characterized in that,
Comprise a specific identity information during described special use inserts at random and replys, be used to notify this special use of ME to insert at random and reply the rollback of the access at random temporal information that is used to carry the ME special use.
6. method as claimed in claim 2 is characterized in that, described step of dividing a plurality of special-purpose random access guidings in advance comprises:
Divide the random access guiding scope of a special use for all ME; Perhaps
Be that different classes of ME divides different random access guiding scopes in advance,, belong to same group the ME or the ME of same type of service or the ME of same access priority and belong to same classification as special-purpose random access guiding separately.
7. the method for claim 1 is characterized in that, described method further comprises:
Set in advance one or more special-purpose random access guidings;
In random access procedure, when the base station is in overload, described base station is replied in described access at random and is carried the special-purpose sub-head corresponding with described special-purpose random access guiding among the MAC PDU, and a special use corresponding with described special-purpose son head insert at random and reply, and is included as the rollback of the access at random temporal information of the special use of ME setting during described special use inserts at random and replys;
Described ME reads the corresponding special use of described special-purpose son head and inserts at random and reply, and obtains and inserts the rollback temporal information at random.
8. method as claimed in claim 7 is characterized in that,
Described special use comprises in inserting at random and replying: the rollback of the access at random temporal information of the special use of ME category information and such ME correspondence, described ME category information comprises one of following information: ME group id, type of service sign, access priority.
9. as claim 1 or 2 or 7 described methods, it is characterized in that,
Described newly-increased special use inserts at random to reply and is positioned at original the access at random and replys before the MAC RAR.
10. as claim 1 or 2 or 7 described methods, it is characterized in that,
The described adjustable length of replying MAC PDU and/or described special-purpose random access guiding that inserts at random.
11. as claim 1 or 2 or 7 described methods, it is characterized in that,
The described rollback temporal information that inserts at random is for inserting the rollback time at random, described ME read described insert the rollback temporal information at random after, directly know oneself rollback time of access at random, according to the described rollback time re-accessing network that inserts at random.
12. as claim 1 or 2 or 7 described methods, it is characterized in that,
The described rollback temporal information that inserts at random is for adjusting the factor, described ME read described insert the rollback temporal information at random after, know oneself rollback time of access at random by calculating, according to the described rollback time re-accessing network that inserts at random.
13. method as claimed in claim 12 is characterized in that,
The described adjustment factor is scale parameter or side-play amount; When the described adjustment factor is scale parameter, describedly be calculated as multiply operation; When the described adjustment factor is side-play amount, describedly be calculated as add operation.
14. a MTC equipment inserts rollback time announcement system at random, comprising: base station and Machine Type communication equipment (ME), wherein:
Described base station comprises special-purpose leading division module, rollback time sending module, wherein:
The leading division module of described special use is used for dividing one or more special-purpose random access guidings for Machine Type communication equipment (ME) in advance;
Described rollback time sending module, be used at random access procedure, when the base station is in overload, reply the special use of carrying in the medium Access Layer Packet Data Unit (MAC PDU) corresponding to described special-purpose random access guiding in the access at random that sends to terminal and insert at random and reply, comprise the rollback of the access at random temporal information of ME special use during described special use inserts at random and replys;
Described ME comprises rollback time receiver module, wherein:
Described rollback time receiver module, be used for receive described special use insert at random reply after, read the rollback of access at random temporal information wherein.
15. system as claimed in claim 14 is characterized in that,
The special-purpose leading division module of described base station is further used for dividing a plurality of special-purpose random access guidings for ME in advance;
Described ME also comprises and inserts initiation module at random, its be used for using described special-purpose random access guiding any initiate to insert at random;
The rollback time sending module of described base station, be further used in random access procedure, random access guiding in the access at random that judgement receives is any in the described special-purpose random access guiding, and when described base station is in overload, reply inserting at random of sending to terminal and to carry the corresponding special use of being adopted with described ME of special-purpose random access guiding among the MAC PDU and insert at random and reply, described special use inserts at random replys the rollback of the access at random temporal information that is included as the special use that ME is provided with;
The rollback time receiver module of described ME, be further used for receive described special use insert at random reply after, read the rollback of access at random temporal information wherein.
16. system as claimed in claim 15 is characterized in that, described rollback time sending module is further used for:
Increase a corresponding special use of the special-purpose random access guiding that is adopted with described ME among the MAC PDU and insert at random and reply inserting at random to reply, insert at random in described special use and carry the described rollback temporal information that inserts at random in replying; Perhaps
Increase the corresponding special use of special-purpose random access guiding that a plurality of and described ME adopted among the MAC PDU and insert at random and reply inserting at random to reply, each special use inserts the rollback of the access at random temporal information of replying the special use of carrying ME category information and such ME correspondence at random, and described ME category information comprises one of following information: type of service sign, access priority, ME group id.
17. system as claimed in claim 15 is characterized in that, the leading division module of described special use is further used for:
Divide the random access guiding scope of a special use for all ME; Perhaps
Be that different classes of ME divides different random access guiding scopes in advance,, belong to same group the ME or the ME of same type of service or the ME of same access priority and belong to same classification as special-purpose random access guiding separately.
18. system as claimed in claim 14 is characterized in that,
The special-purpose leading division module of described base station is further used for for ME one or more special-purpose random access guidings being set in advance;
The rollback time sending module of described base station, be further used in random access procedure, when the base station is in overload, described base station is replied in described access at random and is carried the special-purpose sub-head corresponding with described special-purpose random access guiding among the MAC PDU, and a special use corresponding with described special-purpose son head insert at random and reply, and is included as the rollback of the access at random temporal information of the special use of ME setting during described special use inserts at random and replys;
The rollback time receiver module of described ME, the special use of further reading described special-purpose son head correspondence inserts at random replys, and obtains and inserts the rollback temporal information at random.
19. system as claimed in claim 18 is characterized in that,
Described special use comprises in inserting at random and replying: the rollback of the access at random temporal information of the special use of ME category information and such ME correspondence, described ME category information comprises one of following information: ME group id, type of service sign, access priority.
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