CN102291822B - A kind of MTC device random access backoff time announcement method and system - Google Patents
A kind of MTC device random access backoff time announcement method and system Download PDFInfo
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Abstract
The invention discloses a kind of MTC device random access backoff time announcement method and system, notice ME adopts the random access backoff time being different from common UE to be linked into network.Described method comprises: divide one or more special random access preamble for machine type communication device (ME) in advance; In the random access procedure, when overloaded base stations, the special Stochastic accessing response of carrying corresponding to described special random access preamble is replied in Medium Access Layer Packet Data Unit (MAC PDU) in described base station to the Stochastic accessing that terminal sends, described special Stochastic accessing response comprises the special random access backoff temporal information of ME; ME, after receiving described special Stochastic accessing response, reads random access backoff temporal information wherein.Adopt the method for the invention, the different random access backoff time can be fed back for ordinary terminal and MTC device, avoid the network congestion that MTC device causes in the random access procedure.
Description
Technical field
The present invention relates to the communications field, relate generally to based on LTE (Long Term Evolution, Long Term Evolution) MTC (Machine Type Communication, machine type communication) rollback of MTC device when Network with Random Multiple Access System (Back Off is called for short BO) time announcement method and system in the network architecture.
Background technology
M2M (Machine to Machine (Communication), machine-to-machine communication) is the concept 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 realization rate comprises the technology of various networking.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 Machine To Machine or Human-to-Machine.Data communication between one or more machine is defined as MTC (Machine Type Communication), in this case lessly needs human-computer interaction.Participate in the machine of MTC, be defined as MTC device (MTC Equipment is called for short ME).MTC device is the terminal of MTC user, communicates with other MTC device, MTC server by PLMN (Public Land MobileNetwork, public land mobile communications network).Fig. 1 is the MTC network structure under LTE framework, and as shown in Figure 1, ME is connected with PLMN network by MTC server by the terminal equipment ME of carrier network with MTC server (Server) communication, and MTC server provides service for MTC user.E-UTRAN (Evolved-Universal Terrestrial Radio Access Network) in figure is Evolved UTRAN, MME (Mobility Management Entity) is Mobility Management Entity, SGW (Serving Gateway) is gateway, PGW (PDN Gateway) is packet data gateway, and HSS (Home Subscriber Server) is home subscriber server.
Stochastic accessing is a most basic function of terminals in wireless communication systems, and it makes terminal and network connect becomes possibility.Just as its name, the initiation of such access and the resource of employing have randomness, certainly access and successfully also have randomness.Stochastic accessing has two kinds of patterns: based on competitive mode with based on noncompetitive pattern.The flow process of the random access procedure of these two kinds of patterns is different, is applicable to different scenes.
Be suitable for based in the Stochastic accessing application process below of competitive mode: the initial access under RRC (radio resource control) idle condition; The initial access that wireless losses is later; Under RRC connection status, when there being transmitting uplink data.
Be suitable for based in the Stochastic accessing application process below of noncompetitive pattern: under RRC_CONNECTED state, when descending have a transfer of data time; The random access procedure of terminal in handoff procedure.
As shown in Figure 2, the Stochastic accessing based on competitive mode is divided into four steps:
Step one, transmission comprise RACH (Random AccessChannel, the Random Access Channel) request of random access guiding (preamble); UE (User Equipment, subscriber equipment) before initiation random access request, Stochastic choice send opportunity from available Stochastic accessing send opportunity, is sent to base station by selected lead code from Stochastic choice lead code of available lead code set equal probability.
Step 2, accidental access response (Random Access Reponse, hereinafter referred to as RAR) message; ENB (Evolved NodeB, evolved base station) sends random access feedback messages, i.e. RAR message to UE.After eNB correctly solves one or more lead code on certain Stochastic accessing send opportunity, corresponding RA-RNTI (Random Access-Radio NetworkTemporary Identifier, random access radio network temporary mark) is calculated according to send opportunity.According to these information generation 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, the sub-head in MAC head and the RAR field domain in payload are one to one.The form of MAC RAR as shown in Figure 4, comprise reserved place (1bit), time advance order, up license (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 in accidental access response MAC PDU according to the load state of current Stochastic accessing, carries Backoff time in the sub-head of rollback.Its effect makes user be do not carry out that lead code is counter to be sent immediately in the Stochastic accessing chance that the next one is available when there is random access collision, but send lead code delaying to retransmit in time keeping out of the way for one section again, thus reduce the probability collided between user.
Step 3, terminal recognition; UE is to the RRC information of eNB transmit band user ID.When multiple UE selects identical lead code to send at identical send opportunity in the first step, so in step 2 random challenge message have multiple UE and receive.These UE have identical C-RNTI.So comprise the identification information that uniquely can identify different UEs in RRC information.
Step 4, competition are eliminated; ENB sends collision and solves message.Due to the RRC information that multiple UE may be had in same uplink authorization to send oneself simultaneously, eNB therefrom correctly demodulates the RRC information of a UE, at PDCCH (Physical Downlink Control Channel, Physical Downlink Control Channel) upper transmission collision solution message, carry out scrambling to the C-RNTI that collision solves the UE comprised in PDCCH content RRC information corresponding to message, and carry the identification information accessing successful UE.According to this collision of identification information judgment, UE solves whether message is oneself, if so, then adopt one's own C-RNTI to receive PDCCH, if correctly can receive PDCCH, then thinks that Stochastic accessing is successful.
In the random access procedure, following several situation is had to adopt fallback mechanism.One is that accidental access response is abnormal, if be exactly the RAP ID (random access guiding mark) that UE does not receive the leading correspondence that it sends in accidental access response specifically, or does not receive accidental access response in certain time length.Another situation is exactly as described in step 2 above, and in UE random access procedure, produce collision, random access failure appears in some UE.In addition, when system is in overload, such as it cannot be reallocated and more send resource that RRC information uses etc., this time, it wished that some UE can postpone a period of time transmission RACH request naturally, by rollback (Back Off when receiving random access response and inside accidental access response message (RAR message) form, be called for short BO) parameter realization, this parameter is exactly the parameter of fallback mechanism, if the UE monitoring RAR message finds that there is a BO instruction, so it will save this value, when needing again to do Stochastic accessing subsequently, the time of targeting sequencing is sent out as postponement at random from the value of selecting 0 to BO value.In the prior art, Backoff time Parameter units is millisecond, can from below 12 value select one: 0,20,30,40,60,80,120,160,240,320,480,960.Base station sends to the BO parameter of carrying in the accidental access response message of terminal to be that base station is determined according to the load of machinery systems, all adopts same BO parameter for the terminal accessed in a Serving cell.
Terminal quantity in MTC network is numerous, when great amount of terminals initiate simultaneously random access request be linked into network time, the resource in network is not enough, and a large amount of MTC device access failure can occur, and therefore again can access within the BO time.A large amount of MTC device initiates random access request at short notice, also can cause the congestion situation in network.Such as electricity meter-reading operation regulation MTC device sends data in certain specific time to network, needs these terminals to be linked into network at special time simultaneously.When a large amount of MTC device is linked into network simultaneously, the likelihood ratio that random access collision occurs is comparatively large, and a large amount of MTC device there will be random access failure, and the ME of these random access failures also can be linked into network again.Be linked into network to alleviate in a large amount of ME short time network caused gather around base situation, need the longer BO time.MTC device selects a time to be again linked into network within the longer BO time.But in order to not affect the quality of service of Generic End-User, if ordinary terminal generation random access collision, usually needing to be linked into network as early as possible, in Stochastic accessing answering, obtaining the shorter BO time just enough.On the other hand, in some application scenarios, when MTC device has time sensitivity, MTC device has the access priority higher than common UE, and now MTC device is linked into network fast, needs to obtain the BO time less than common UE.When ordinary terminal and MTC device are linked into network a Serving cell, base station distinguishing terminal type can not send Stochastic accessing response MAC PDU to terminal.For different terminals send RACH RAR in same Stochastic accessing response message MAC PDU, the BO time of wherein carrying also is the same, and ordinary terminal and MTC device cannot get different Backoff time.For the MTC device realizing different business, also need the different random access backoff time, but prior art also cannot realize base station feeds back the different BO time for different business.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of MTC device random access backoff time announcement method and system, and notice ME adopts the random access backoff time being different from common UE to be linked into network.
For solving the problems of the technologies described above, the invention provides a kind of MTC device random access backoff time announcement method, comprising:
One or more special random access preamble is divided in advance for machine type communication device (ME);
In the random access procedure, when overloaded base stations, the special Stochastic accessing response of carrying corresponding to described special random access preamble is replied in Medium Access Layer Packet Data Unit (MAC PDU) in described base station to the Stochastic accessing that terminal sends, described special Stochastic accessing response comprises the special random access backoff temporal information of ME;
ME, after receiving described special Stochastic accessing response, reads random access backoff temporal information wherein.
Further, described method comprises further: divide multiple special random access preamble in advance; In the random access procedure, ME uses any one the initiation Stochastic accessing in described special random access preamble, when base station is in overload, according to the random access guiding that terminal uses, described base station judges that described terminal is as after ME, in the Stochastic accessing response MAC PDU sent to terminal, carry the special Stochastic accessing corresponding with the special random access preamble that described ME adopts reply, described special Stochastic accessing response comprises the special random access backoff temporal information for ME is arranged; Described ME reads the special Stochastic accessing response corresponding with the special random access preamble that it adopts, and obtains random access backoff temporal information.
Further, describedly in Stochastic accessing response MAC PDU, carry the method that the special Stochastic accessing corresponding with the special random access preamble that described ME adopts reply comprise: reply in MAC PDU at Stochastic accessing the special Stochastic accessing increasing special random access preamble adopted with described ME corresponding and reply, in described special Stochastic accessing is replied, carry described random access backoff temporal information; Or the special Stochastic accessing increasing special random access preamble that multiple and described ME adopts corresponding in Stochastic accessing response MAC PDU is replied, ME category information and special random access backoff temporal information corresponding to such ME are carried in each special Stochastic accessing response, and described ME category information comprises one of following information: type of service mark, access priority, ME group mark.
Further, also carry in following content in described special Stochastic accessing response one or several, identify that for making ME this special Stochastic accessing response issues oneself: Cell Radio Network Temporary Identifier/Identity, Cell-RNTI, random access guiding mark (RAP ID).
Further, described special Stochastic accessing response comprises a specific identity information, for notifying that this special Stochastic accessing response of ME is for carrying the special random access backoff temporal information of ME.
Further, the described step dividing multiple special random access preamble in advance comprises: for all ME divide a special random access guiding scope; Or divide different random access guiding scopes for different classes of ME in advance, as respective special random access preamble, the ME belonging to the ME of same group or the ME of same type of service or same access priority belongs to same classification.
Further, described method comprises further: pre-set one or more special random access preamble; In the random access procedure, when base station is in overload, the special sub-head corresponding with described special random access preamble is carried in described base station in described Stochastic accessing response MAC PDU, and the special Stochastic accessing corresponding with described special sub-head is replied, described special Stochastic accessing response comprises the special random access backoff temporal information for ME is arranged; Described ME reads the special Stochastic accessing response of described special sub-head correspondence, obtains random access backoff temporal information.
Further, described special Stochastic accessing response comprises: ME category information and special random access backoff temporal information corresponding to such ME, described ME category information comprises one of following information: ME group mark, type of service identify, access priority.
Further, before described newly-increased special Stochastic accessing response is positioned at original Stochastic accessing response MACRAR.
Further, the adjustable length of described Stochastic accessing response MAC PDU and/or described special random access preamble.
Further, described random access backoff temporal information is the random access backoff time, described ME, after the described random access backoff temporal information of reading, directly knows the random access backoff time of oneself, according to described random access backoff time re-accessing network.
Further, described random access backoff temporal information is Dynamic gene, and described ME, after the described random access backoff temporal information of reading, knows the random access backoff time of oneself, according to described random access backoff time re-accessing network by calculating.
Further, described Dynamic gene is scale parameter or side-play amount; When described Dynamic gene is scale parameter, described in be calculated as multiply operation; When described Dynamic gene is side-play amount, described in be calculated as add operation.
For solving the problems of the technologies described above, present invention also offers a kind of MTC device random access backoff time announcement system, comprising: base station and machine type communication device (ME), wherein:
Described base station comprises Special leader and divides module, Backoff time sending module, wherein:
Described Special leader divides module, for dividing one or more special random access preamble for machine type communication device (ME) in advance;
Described Backoff time sending module, for in the random access procedure, when base station is in overload, in Stochastic accessing response Medium Access Layer Packet Data Unit (MAC PDU) sent to terminal, carry the special Stochastic accessing response corresponding to described special random access preamble, described special Stochastic accessing response comprises the special random access backoff temporal information of ME;
Described ME comprises Backoff time receiver module, wherein:
Described Backoff time receiver module, for after receiving described special Stochastic accessing response, reads random access backoff temporal information wherein.
Further, the Special leader of described base station divides module, is further used in advance for ME divides multiple special random access preamble;
Described ME also comprises Stochastic accessing initiation module, and it is for using any one the initiation Stochastic accessing in described special random access preamble;
The Backoff time sending module of described base station, be further used in the random access procedure, when the random access guiding in the Stochastic accessing that judgement receives is any one in described special random access preamble, and described base station is when being in overload, in the Stochastic accessing response MAC PDU sent to terminal, carry the special Stochastic accessing corresponding with the special random access preamble that described ME adopts reply, described special Stochastic accessing response comprises the special random access backoff temporal information for ME is arranged;
The Backoff time receiver module of described ME, is further used for, after receiving described special Stochastic accessing response, reading random access backoff temporal information wherein.
Further, described Backoff time sending module, be further used for: the special Stochastic accessing that increase by is corresponding with the special random access preamble that described ME adopts in Stochastic accessing response MACPDU is replied, in described special Stochastic accessing response, carry described random access backoff temporal information; Or the special Stochastic accessing increasing special random access preamble that multiple and described ME adopts corresponding in Stochastic accessing response MAC PDU is replied, ME category information and special random access backoff temporal information corresponding to such ME are carried in each special Stochastic accessing response, and described ME category information comprises one of following information: type of service mark, access priority, ME group mark.
Further, described Special leader divides module and is further used for: for all ME divide a special random access guiding scope; Or divide different random access guiding scopes for different classes of ME in advance, as respective special random access preamble, the ME belonging to the ME of same group or the ME of same type of service or same access priority belongs to same classification.
Further, the Special leader of described base station divides module, is further used in advance for ME arranges one or more special random access preamble;
The Backoff time sending module of described base station, be further used in the random access procedure, when base station is in overload, the special sub-head corresponding with described special random access preamble is carried in described base station in described Stochastic accessing response MAC PDU, and the special Stochastic accessing corresponding with described special sub-head is replied, described special Stochastic accessing response comprises the special random access backoff temporal information for ME is arranged;
The Backoff time receiver module of described ME, reads the special Stochastic accessing response of described special sub-head correspondence further, obtains random access backoff temporal information.
Further, described special Stochastic accessing response comprises: ME category information and special random access backoff temporal information corresponding to such ME, described ME category information comprises one of following information: ME group mark, type of service identify, access priority.
Adopt the method for the invention, the different random access backoff time can be fed back for ordinary terminal and MTC device, avoid the network congestion that MTC device causes in the random access procedure.
Accompanying drawing explanation
Fig. 1 is the MTC network architecture diagram based on LTE;
Fig. 2 is random access procedure flow chart;
Fig. 3 is the structural representation of Stochastic accessing response message MAC PDU;
Fig. 4 is the structural representation of MAC RAR in Stochastic accessing response message;
Fig. 5 is schematic flow sheet corresponding to the embodiment of the present invention;
Fig. 6 is the MAC PDU structure chart of embodiment one correspondence in the present invention;
Fig. 7 is the MAC RAR structure chart of embodiment one correspondence in 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 correspondence in the present invention;
Figure 10 is MAC RAR structural representation in embodiment two in the present invention;
Figure 11 is MAC RAR structural representation in the embodiment of the present invention two;
Figure 12 is extended MAC RAR structural representation in the embodiment of the present invention two;
Figure 13 is MAC PDU structural representation in the embodiment of the present invention two.
Embodiment
Inventive concept of the present invention is: divide one or more special random access preamble for machine type communication device (ME) in advance; In the random access procedure, when overloaded base stations, the special Stochastic accessing response of carrying corresponding to described special random access preamble is replied in Medium Access Layer Packet Data Unit (MAC PDU) in described base station to the Stochastic accessing that terminal sends, described special Stochastic accessing response comprises the special random access backoff temporal information of ME; ME, after receiving described special Stochastic accessing response, reads random access backoff temporal information wherein.
The random access backoff time of oneself is directly known or known by calculating to ME, after the described random access backoff temporal information of reading, according to described random access backoff time re-accessing network.
Above-mentioned Stochastic accessing response MAC PDU can referred to as MAC PDU; Stochastic accessing response MACRAR can referred to as MAC RAR.
Particularly, one of following method is comprised:
Method one:
Divide multiple special random access preamble (preamble) in advance; In the random access procedure, ME uses any one the initiation Stochastic accessing in described special random access preamble, when base station is in overload, according to the random access guiding that terminal uses, described base station judges that described terminal is as after ME, in the Stochastic accessing response MAC PDU sent to terminal, carry the special Stochastic accessing corresponding with the special random access preamble that described ME adopts reply, described special Stochastic accessing response comprises the special random access backoff temporal information for ME is arranged; Described ME reads the special Stochastic accessing response corresponding with the special random access preamble that it adopts, and obtains random access backoff temporal information.
Particularly, the step of described " carrying the special Stochastic accessing corresponding with the special random access preamble that described ME adopts to reply in Stochastic accessing response MAC PDU " comprising:
The special Stochastic accessing that increase by is corresponding with the special random access preamble that described ME adopts in Stochastic accessing response MAC PDU is replied, in described special Stochastic accessing response, carry described random access backoff temporal information; Or
The special Stochastic accessing increasing special random access preamble that multiple and described ME adopts corresponding in Stochastic accessing response MAC PDU is replied, ME category information and special random access backoff temporal information corresponding to such ME are carried in each special Stochastic accessing response, and described ME category information comprises one of following information: type of service mark (Service ID), access priority (Access Priority), ME group identify (Group ID).The special random access preamble that inhomogeneous ME is corresponding different, returns different BO temporal informations as different ME.
Certain class MTC terminal can refer to have same type of service, or same access priority, or belong to the ME (can divide into groups according to CAMEL-Subscription-Information or regional feature) of same group, corresponding ME category information can be: type of service mark or access priority or group mark.
Need to carry in following content in special Stochastic accessing response MAC RAR one or several, identify that to make ME this Stochastic accessing response MAC RAR is to oneself: C-RNTI, RAP ID.This RAPID is consistent with the RAP ID in the sub-head of this ME.
Owing to having divided special random access preamble scope for ME, that Stochastic accessing can be initiated according to the preamble judgement in random access request in base station is common UE or ME, so in response message, BO time or Dynamic gene can be returned for ME, thus avoid ME and common UE to adopt the identical BO time.Preferably, a special random access guiding scope can be divided for all ME; Or divide different random access guiding scopes for different classes of ME in advance, as respective special random access preamble, the ME belonging to the ME of same group or the ME of same type of service or same access priority belongs to same classification.
In the method, for Stochastic accessing response message, only increase in Stochastic accessing response MAC PDU payload and reply MAC RAR with the special Stochastic accessing corresponding to the sub-head (namely corresponding with the special random access preamble that ME uses sub-head) of described ME, the sub-head of this ME in Stochastic accessing response MAC PDU is not changed, just this sub-head can reply MAC RAR by corresponding multiple Stochastic accessing, comprise in prior art the Stochastic accessing response MAC RAR carrying normal content, and the special Stochastic accessing response MAC RAR that the present invention increases newly.For ME, ME replys except MAC RAR except reading the Stochastic accessing carrying normal content, also needs to read newly-increased one or more special Stochastic accessing response MAC RAR.
Method two:
Pre-set one or more special random access preamble; In the random access procedure, when base station is in overload, the special sub-head corresponding with described special random access preamble is carried in described base station in described Stochastic accessing response MAC PDU, and the special Stochastic accessing corresponding with described special sub-head is replied, described special Stochastic accessing response comprises the special random access backoff temporal information for ME is arranged; Described ME reads the special Stochastic accessing response of described special sub-head correspondence, obtains random access backoff temporal information.
Preferably, described special Stochastic accessing response comprises: ME category information and special random access backoff temporal information corresponding to such ME, described ME category information comprises one of following information: ME group mark, type of service identify, access priority.
When described special random access preamble has multiple, the corresponding respective special sub-head of each special random access preamble and the response of special Stochastic accessing.
When needs carry more contents, can expand MAC PDU and/or special random access preamble, such as, adjust the length that it takies.
Preferably, in above-mentioned two methods, before newly-increased special Stochastic accessing response MAC RAR is positioned at original Stochastic accessing response MAC RAR, namely all Stochastic accessing response MAC RAR's is last, before filling field.
Random access backoff temporal information in above-mentioned two methods comprises random access backoff time or Dynamic gene.When described random access backoff temporal information is the random access backoff time, described ME, after the described random access backoff temporal information of reading, directly knows the random access backoff time of oneself, according to described random access backoff time re-accessing network.When described random access backoff temporal information is Dynamic gene, described ME, after the described random access backoff temporal information of reading, knows the random access backoff time of oneself, according to described random access backoff time re-accessing network by calculating.
Above-mentioned Dynamic gene can be a scale parameter or side-play amount.When described Dynamic gene is scale parameter, described in be calculated as multiply operation; When described Dynamic gene is side-play amount, described in be calculated as add operation.Particularly, Dynamic gene can be a scale parameter, and now ME executable operations can be do multiply operation to the BO time according to Dynamic gene; Dynamic gene also can be a side-play amount, and now ME can do add operation to the BO time according to side-play amount.Described side-play amount is the difference between ME special BO time and the BO time of common UE, and ME knows the BO time of common UE by the sub-head of Stochastic accessing response MAC PDU rollback, then according to above-mentioned side-play amount, can know the random access backoff time of oneself.
Realize the reporting system of said method, comprising: base station and ME, wherein:
Described base station comprises Special leader and divides module, Backoff time sending module, wherein:
Described Special leader divides module, in advance for ME divides one or more special random access preamble;
Described Backoff time sending module, for in the random access procedure, when base station is in overload, in the Stochastic accessing response MAC PDU sent to terminal, carry the special Stochastic accessing response corresponding to described special random access preamble, described special Stochastic accessing response comprises the special random access backoff temporal information of ME;
Described ME comprises Backoff time receiver module, wherein:
Described Backoff time receiver module, for after receiving described special Stochastic accessing response, reads random access backoff temporal information wherein.
For said method one, preferably:
The Special leader of described base station divides module, is further used in advance for ME divides multiple special random access preamble;
Described ME also comprises Stochastic accessing initiation module, and it is for using any one the initiation Stochastic accessing in described special random access preamble;
The Backoff time sending module of described base station, be further used in the random access procedure, when the random access guiding in the Stochastic accessing that judgement receives is any one in described special random access preamble, and described base station is when being in overload, in the Stochastic accessing response MAC PDU sent to terminal, carry the special Stochastic accessing corresponding with the special random access preamble that described ME adopts reply, described special Stochastic accessing response comprises the special random access backoff temporal information for ME is arranged;
The Backoff time receiver module of described ME, is further used for, after receiving described special Stochastic accessing response, reading random access backoff temporal information wherein.
Preferably, described Backoff time sending module, is further used for:
The special Stochastic accessing that increase by is corresponding with the special random access preamble that described ME adopts in Stochastic accessing response MAC PDU is replied, in described special Stochastic accessing response, carry described random access backoff temporal information; Or
The special Stochastic accessing increasing special random access preamble that multiple and described ME adopts corresponding in Stochastic accessing response MAC PDU is replied, ME category information and special random access backoff temporal information corresponding to such ME are carried in each special Stochastic accessing response, and described ME category information comprises one of following information: type of service mark, access priority, ME group mark.
Preferably, described Special leader division module is further used for:
For all ME divide a special random access guiding scope; Or
Divide different random access guiding scopes for different classes of ME in advance, as respective special random access preamble, the ME belonging to the ME of same group or the ME of same type of service or same access priority belongs to same classification.
For said method two, preferably:
The Special leader of described base station divides module, is further used in advance for ME arranges one or more special random access preamble;
The Backoff time sending module of described base station, be further used in the random access procedure, when base station is in overload, the special sub-head corresponding with described special random access preamble is carried in described base station in described Stochastic accessing response MAC PDU, and the special Stochastic accessing corresponding with described special sub-head is replied, described special Stochastic accessing response comprises the special random access backoff temporal information for ME is arranged;
The Backoff time receiver module of described ME, reads the special Stochastic accessing response of described special sub-head correspondence further, obtains random access backoff temporal information.
Preferably, described special Stochastic accessing response comprises: ME category information and special random access backoff temporal information corresponding to such ME, described ME category information comprises one of following information: ME group mark, type of service identify, access priority.
MAC PDU and Stochastic accessing response MAC RAR block diagram illustrating several specific embodiment of the present invention is replied below in conjunction with random access procedure and Stochastic accessing.
First in conjunction with Figure of description 5 to two embodiments of the present invention the random access procedure that is suitable for be described, the random access procedure that the present invention uses mainly comprises the following steps:
Step 1, ME needs to be linked into network, and adopt the accidental access method of competition, ME sends random access request to base station, carries random access guiding in message;
ME initiates the trigger condition of Stochastic accessing to be had multiple, may be to have received the Trigger message that network side sends, or ME powers on triggering.ME is Stochastic choice send opportunity from available Stochastic accessing send opportunity, and on this send opportunity, ME sends random access request to base station, carries random access guiding (preamble) in message;
Step 2, after base station have received a large amount of random access request, base station judges whether enough resource process random access requests according to the disposal ability of self, if overload conditions appears in base station, so need to carry the Backoff time scope that common UE initiates Stochastic accessing again in Stochastic accessing response message;
Step 3, base station returns Stochastic accessing response MAC PDU, wherein carries the random access backoff time;
In the present invention, except the BO time of common UE, in message, also comprise ME special BO time or Dynamic gene information; The method of BO time or Dynamic gene of carrying in message is see the following examples.
Step 4, ME judges whether to need initiating random access procedure again, if the MACRAR that receives of ME occurs abnormal, does not carry RAP ID or terminal and do not receive MAC RAR for oneself in such as MAC RAR, and terminal can initiating random access procedure again.Have employed same preamble if there is ME and other terminal, so will produce collision, there will be the situation of terminal random access failure, ME also can initiate the process of Stochastic accessing to network again in this case.
Step 5, ME is initiating random access procedure again.
If ME determines to need again to initiate Stochastic accessing, determine the Backoff time of again initiating Stochastic accessing according to the ME carried in random challenge message special BO time or Dynamic gene information, again initiate Stochastic accessing at the Backoff time determined.If what ME received is Dynamic gene, it can be do multiply operation to the Stochastic accessing BO time of common UE according to Dynamic gene that ME performs adjustment operation.If load of base station is overweight, the BO time of ME is needed to be greater than common UE, then scale factor is set to the value being greater than 1 by base station, otherwise when ME access priority is higher, need to access more fast than common UE, then scale factor is set to the value being less than 1 by base station, and the size of concrete value is determined according to local load condition by base station; Dynamic gene also can be a side-play amount, now ME can do add operation to the BO time according to side-play amount, if load of base station is overweight, need the BO time of ME to be greater than common UE, side-play amount be set on the occasion of, otherwise when ME access priority higher, need to access more fast than common UE, can be set to negative value, now be equivalent to do subtraction, the size of concrete value is determined according to local load condition by base station.
First embodiment
The present embodiment adopts said method one, and special is the default random access guiding set of ME, these random access guidings can be from existing 64 leading the part that marks off, also can be newly-increased lead code set.
In Fig. 5 step 1, ME sends in random access request the special lead code of carrying as ME is arranged; According to presetting the lead code of carrying in the information of leading set and random access request, base station can judge that random access request is that ME sends after have received the random access request that ME sends.
In Fig. 5 step 3, ME special BO time or Dynamic gene are carried in base station in Stochastic accessing response message.Because in MAC RAR of the prior art, each field domain has had concrete meaning, be inconvenient to expand.In order to carry BO time or Dynamic gene by RAR, need for RAP ID increases a corresponding MAC RAR, corresponding MAC PDU structure as shown in Figure 6, corresponding two the MAC RAR of MAC head in the present embodiment, one of them is that in prior art, shape is as the MAC RAR of Fig. 4 form, and one is the newly-increased special MACRAR being used for transmitting BO time or Dynamic gene.The special BO time of described ME or Dynamic gene are placed in newly-increased MAC RAR.
In prior art, the data volume size of MARRAR is fixing, and UE goes out corresponding MAC RAR position according to MAC head position calculation, and the byte of the MAC RAR position of decoding corresponding position just can obtain required corresponding Stochastic accessing response message content.Preferably, in the present embodiment, in order to prevent terminal from misreading newly-increased special MAC RAR, this special MAC RAR is placed in after all MACRAR.As shown in Figure 6, a Stochastic accessing response MAC PDU has 4 sub-heads, 5 MAC RAR, and son 3 correspondence one increases the special MACRAR being used for transmitting BO time or Dynamic gene newly.After this newly-increased MAC RAR is placed in four MAC RAR.Preferably, newly-increased MAC RAR byte number is identical with MAC RAR byte number in prior art, and content is different.ME special BO time or Dynamic gene is at least carried in newly-increased MAC RAR.Optionally, as newly-increased multiple MAC RAR, following content can be comprised: ME category information and special random access backoff temporal information corresponding to such ME in each newly-increased MAC RAR, as shown in Figure 7, described ME category information comprises one of following information to the concrete structure of MAC RAR: type of service mark (Service ID), access priority (AccessPriority), ME group mark (Group ID).Preferably, also comprise for identifying that this MAC RAR is the identification information (C-RNTI and/or RAPID) of the MAC RAR of this ME in newly-increased MAC RAR.
In Fig. 5 step 4, after ME have received Stochastic accessing response message, several method can be had to go to read BO time or Dynamic gene:
1) make an appointment ME after receiving Stochastic accessing response message, need to read BO time or Dynamic gene information.
2) in order to distinguish the function with the different MAC RAR of same MAC head correspondence, base station increases specific identity information in newly-increased MAC RAR, be used to carry ME special BO time or Dynamic gene information for identifying this MAC RAR, ME after reading this specific identity information this MACRAR known send to oneself, then read the BO time or Dynamic gene of carrying in this RAR.
3) in order to distinguish newly-increased MAC RAR and other MAC RAR, except BO time or Dynamic gene information, base station can also increase RAPID field domain in newly-increased MAC RAR, and it is the leading BO time corresponding with it or Dynamic gene that ME reads RAPID information just known in MACRAR.Newly-increased MAC RAR form can be but be not limited to shown in Fig. 7.
Need to further illustrate, in Figure 5 in step 3, after ME has read first the MAC RAR corresponding with RAPID in sub-head, interim C-RNTI can be obtained.After ME has read second the MAC RAR corresponding with above-mentioned RAPID, can learn that this RAR is used for transmitting BO time or Dynamic gene specially according to the identification information shown in Fig. 7, whether mate according to the C-RNTI in C-RNTI in RAR and the RAR that receives before and can learn in this RAR and carry whether oneself BO time or Dynamic gene.Or the RAP id information in corresponding sub-head can be carried in base station in RAR, ME learns after reading the RAP id information in MAC head that what carry in RAR is oneself BO time or Dynamic gene information.Common UE only reads the RAR of the sub-head correspondence with oneself, ignores newly-increased MAC RAR.
What needs further illustrated is, if the random random access guiding carried in Fig. 5 step 1 is that certain ME classification is special, such ME special BO time or Dynamic gene so can be carried in Stochastic accessing response message, the identification information of such ME can be increased in above-mentioned newly-increased MAC RAR, such as Group ID, now Group ID is as the field domain information of in MAC RAR.Preferably, base station can adopt different B O Backoff time or Dynamic gene for the ME terminal of different service types or access priority, correspondingly, can increase service identification or access priority as ME category information in above-mentioned newly-increased MAC RAR.
Need to further illustrate, can expand according to the demand to MAC PDU and MAC RAR, structure chart can see Fig. 6 and Fig. 7, and newly-increased MAC RAR is placed in less than after all MAC RAR expanded.
Second embodiment
In the present embodiment, adopting said method two, in order to carry ME Backoff time in MAC RAR, presetting special random access preamble specially, this special random access preamble can be the part marked off from existing 64 lead code set, also can be newly-increased leading.Described default random access guiding can corresponding all ME, or certain ME group (dividing into groups according to CAMEL-Subscription-Information or region), or realize the ME of certain business, or the ME of certain access priority.The Stochastic accessing response MAC RAR and the described default special random access preamble that carry special BO time or Dynamic gene are corresponding, and terminal does not choose default random access guiding when Network with Random Multiple Access System.Base station is in Stochastic accessing response message MAC PDU, and carry the special RAPID corresponding with described special random access preamble and corresponding special MAC head and special MAC RAR, corresponding relation as shown in Figure 8.
In Figure 5 in step 1, ME sends random access request to base station.After base station have received the random access request that terminal sends, arrange in the sub-head of Stochastic accessing response MAC PDU and special RAPID that above-mentioned default Special leader is corresponding and special sub-head, feed back to terminal by Stochastic accessing response message in Fig. 5 step 2.When terminal reads the RAP id information in MAC head, common UE ignores the special MAC head at special RAP ID place and corresponding special MAC RAR.After ME reads RAP id information, learn that the MAC RAR of this sub-head correspondence in RAP ID place is used for transmitting BO time or Dynamic gene scope, by reading corresponding MAC RAR content obtaining special BO time or Dynamic gene specially.
In the present embodiment, multiple MAC PDU and MAC RAR structure can be had for transmitting BO time or Dynamic gene:
1) corresponding with this method MAC PDU structure such as Fig. 9 illustrates, but is not limited to structure shown in Fig. 9.In fig .9, MAC 3 is special MAC heads corresponding with described default Special leader.Carry ME special BO time or Dynamic gene in corresponding MAC RAR3, MAC RAR form adopts multiple, and wherein one can be as shown in Figure 10, wherein only carries BO time or Dynamic gene.
2) for ME packet equipment, MAC PDU structure such as Fig. 9 corresponding with this method illustrates, but is not limited to structure shown in Fig. 9.In the special MAC RAR of Stochastic accessing response message, carry BO time or Dynamic gene that MTC divides into groups special, corresponding Group ID (group character) can also be carried.Corresponding MAC PDU form and MAC RAR as shown in figs. 9 and 11, but can be not limited to the form in Fig. 9 and Figure 11.Each special MAC RAR at least can carry the information of two ME groupings, divides into groups for each ME, comprises the group mark of this grouping and the BO temporal information of this grouping correspondence.
Preferably, in order to carry BO time or the Dynamic gene of multiple ME grouping in special MAC RAR, can expand the size of special MAC RAR and form, the special MACRAR form after expansion can be as shown in figure 12.Special MAC RAR after expansion can take the position of multiple MACRAR, this extended MAC RAR content is misread in order to prevent common UE, after needing that this extended MAC RAR is placed in all MAC RAR positions, accordingly, after needing that corresponding for this extended MAC RAR head is also placed in all sub-heads, corresponding MAC PDU structure chart as shown in figure 13.
Wherein ME packet equipment refers to: the mobile terminal belonging to the member of certain group according to signing or dynamic distribution group mark, now, this mobile terminal has group identification information (Group ID).
Only be described for ME group, when classifying with type of service or priority, method is similar, repeats no more herein herein
3) base station can adopt different B O Backoff time or Dynamic gene for inhomogeneity (group or type of service or access priority) ME terminal.Inhomogeneity ME special BO time or Dynamic gene can be carried in the special MAC RAR of Stochastic accessing response message, and the category information of correspondence, comprise group mark or type of service mark or access priority.MAC PDU form see 11, at least can carry the BO temporal information of two class ME see Fig. 9, MAC RAR form.Certainly the form in Fig. 9 and Figure 11 is also not limited to.Such as, in order to send BO time or the Dynamic gene of multiple ME class in special MAC RAR, all can expand the size of MAC RAR and form, the special MAC RAR form after expansion can see Figure 12.Special MAC RAR after expansion can take the position of multiple MACRAR, MAC RAR content is misread in order to prevent common UE, need after all MAC RAR positions in MAC RAR corresponding MAC PDU head, accordingly, need by sub-for correspondence head also after all sub-heads, corresponding MAC PDU structure chart as shown in figure 13.
The all or part of step that one of ordinary skill in the art will appreciate that in said method is carried out instruction related hardware by program and is completed, and described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can use one or more integrated circuit to realize.Correspondingly, each module in above-described embodiment can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (19)
1. a MTC device random access backoff time announcement method, comprising:
In advance for machine type communication device ME divides one or more special random access preamble, enable base station according in random access request random access guiding judge initiate Stochastic accessing be normal user equipments UE or ME;
In the random access procedure, when overloaded base stations, the special Stochastic accessing response of carrying corresponding to described special random access preamble is replied in Medium Access Layer Packet Data Unit MAC PDU in described base station to the Stochastic accessing that terminal sends, described special Stochastic accessing response comprises the special random access backoff temporal information of ME, and described ME special random access backoff time is different from the Backoff time of common UE;
ME, after receiving described special Stochastic accessing response, reads random access backoff temporal information wherein.
2. the method for claim 1, is characterized in that, described method comprises further:
Divide multiple special random access preamble in advance;
In the random access procedure, ME uses any one the initiation Stochastic accessing in described special random access preamble, when base station is in overload, according to the random access guiding that terminal uses, described base station judges that described terminal is as after ME, in the Stochastic accessing response MAC PDU sent to terminal, carry the special Stochastic accessing corresponding with the special random access preamble that described ME adopts reply, described special Stochastic accessing response comprises the special random access backoff temporal information for ME is arranged;
Described ME reads the special Stochastic accessing response corresponding with the special random access preamble that it adopts, and obtains random access backoff temporal information.
3. method as claimed in claim 2, is characterized in that, describedly in Stochastic accessing response MACPDU, carries the method that the special Stochastic accessing corresponding with the special random access preamble that described ME adopts reply comprise:
The special Stochastic accessing that increase by is corresponding with the special random access preamble that described ME adopts in Stochastic accessing response MAC PDU is replied, in described special Stochastic accessing response, carry described random access backoff temporal information; Or
The special Stochastic accessing increasing special random access preamble that multiple and described ME adopts corresponding in Stochastic accessing response MAC PDU is replied, ME category information and special random access backoff temporal information corresponding to this ME are carried in each special Stochastic accessing response, and described ME category information comprises one of following information: type of service mark, access priority, ME group mark.
4. method as claimed in claim 3, is characterized in that,
Also carry in following content in described special Stochastic accessing response one or several, identify that for making ME this special Stochastic accessing response issues oneself: Cell Radio Network Temporary Identifier/Identity, Cell-RNTI, random access guiding mark RAP ID.
5. method as claimed in claim 3, is characterized in that,
Described special Stochastic accessing response comprises a specific identity information, for notifying that this special Stochastic accessing response of ME is for carrying the special random access backoff temporal information of ME.
6. method as claimed in claim 2, it is characterized in that, the described step dividing multiple special random access preamble in advance comprises:
For all ME divide a special random access guiding scope; Or
Divide different random access guiding scopes for different classes of ME in advance, as respective special random access preamble, the ME belonging to the ME of same group or the ME of same type of service or same access priority belongs to same classification.
7. the method for claim 1, is characterized in that, described method comprises further:
Pre-set one or more special random access preamble;
In the random access procedure, when base station is in overload, the special sub-head corresponding with described special random access preamble is carried in described base station in described Stochastic accessing response MAC PDU, and the special Stochastic accessing corresponding with described special sub-head is replied, described special Stochastic accessing response comprises the special random access backoff temporal information for ME is arranged;
Described ME reads the special Stochastic accessing response of described special sub-head correspondence, obtains random access backoff temporal information.
8. method as claimed in claim 7, is characterized in that,
Described special Stochastic accessing response comprises: ME category information and special random access backoff temporal information corresponding to this ME, described ME category information comprises one of following information: ME group mark, type of service identify, access priority.
9. the method as described in claim 1 or 2 or 7, is characterized in that,
Before described special Stochastic accessing response is positioned at original Stochastic accessing response MAC RAR.
10. the method as described in claim 1 or 2 or 7, is characterized in that,
The adjustable length of described Stochastic accessing response MAC PDU and/or described special random access preamble.
11. methods as described in claim 1 or 2 or 7, is characterized in that,
Described random access backoff temporal information is the random access backoff time, and described ME, after the described random access backoff temporal information of reading, directly knows the random access backoff time of oneself, according to described random access backoff time re-accessing network.
12. methods as described in claim 1 or 2 or 7, is characterized in that,
Described random access backoff temporal information is Dynamic gene, and described ME, after the described random access backoff temporal information of reading, knows the random access backoff time of oneself, according to described random access backoff time re-accessing network by calculating.
13. methods as claimed in claim 12, is characterized in that,
Described Dynamic gene is scale parameter or side-play amount; When described Dynamic gene is scale parameter, described in be calculated as multiply operation; When described Dynamic gene is side-play amount, described in be calculated as add operation.
14. 1 kinds of MTC device random access backoff time announcement systems, comprising: base station and machine type communication device ME, wherein:
Described base station comprises Special leader and divides module, Backoff time sending module, wherein:
Described Special leader divides module, for in advance for machine type communication device ME divides one or more special random access preamble, that enable base station judge to initiate Stochastic accessing according to the random access guiding in random access request is normal user equipments UE or ME;
Described Backoff time sending module, for in the random access procedure, when base station is in overload, the special Stochastic accessing response corresponding to described special random access preamble is carried in the Stochastic accessing response Medium Access Layer Packet Data Unit MAC PDU sent to terminal, described special Stochastic accessing response comprises the special random access backoff temporal information of ME, and described ME special random access backoff time is different from the Backoff time of common UE;
Described ME comprises Backoff time receiver module, wherein:
Described Backoff time receiver module, for after receiving described special Stochastic accessing response, reads random access backoff temporal information wherein.
15. systems as claimed in claim 14, is characterized in that,
The Special leader of described base station divides module, is further used in advance for ME divides multiple special random access preamble;
Described ME also comprises Stochastic accessing initiation module, and it is for using any one the initiation Stochastic accessing in described special random access preamble;
The Backoff time sending module of described base station, be further used in the random access procedure, when the random access guiding in the Stochastic accessing that judgement receives is any one in described special random access preamble, and described base station is when being in overload, in the Stochastic accessing response MAC PDU sent to terminal, carry the special Stochastic accessing corresponding with the special random access preamble that described ME adopts reply, described special Stochastic accessing response comprises the special random access backoff temporal information for ME is arranged;
The Backoff time receiver module of described ME, is further used for, after receiving described special Stochastic accessing response, reading random access backoff temporal information wherein.
16. systems as claimed in claim 15, it is characterized in that, described Backoff time sending module, is further used for:
The special Stochastic accessing that increase by is corresponding with the special random access preamble that described ME adopts in Stochastic accessing response MAC PDU is replied, in described special Stochastic accessing response, carry described random access backoff temporal information; Or
The special Stochastic accessing increasing special random access preamble that multiple and described ME adopts corresponding in Stochastic accessing response MAC PDU is replied, ME category information and special random access backoff temporal information corresponding to this ME are carried in each special Stochastic accessing response, and described ME category information comprises one of following information: type of service mark, access priority, ME group mark.
17. systems as claimed in claim 15, is characterized in that, described Special leader divides module and is further used for:
For all ME divide a special random access guiding scope; Or
Divide different random access guiding scopes for different classes of ME in advance, as respective special random access preamble, the ME belonging to the ME of same group or the ME of same type of service or same access priority belongs to same classification.
18. systems as claimed in claim 14, is characterized in that,
The Special leader of described base station divides module, is further used in advance for ME arranges one or more special random access preamble;
The Backoff time sending module of described base station, be further used in the random access procedure, when base station is in overload, the special sub-head corresponding with described special random access preamble is carried in described base station in described Stochastic accessing response MAC PDU, and the special Stochastic accessing corresponding with described special sub-head is replied, described special Stochastic accessing response comprises the special random access backoff temporal information for ME is arranged;
The Backoff time receiver module of described ME, reads the special Stochastic accessing response of described special sub-head correspondence further, obtains random access backoff temporal information.
19. systems as claimed in claim 18, is characterized in that,
Described special Stochastic accessing response comprises: ME category information and special random access backoff temporal information corresponding to this ME, described ME category information comprises one of following information: ME group mark, type of service identify, access priority.
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