CN102014516B - Random access method in (LTE)-A system - Google Patents
Random access method in (LTE)-A system Download PDFInfo
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Abstract
The invention relates to the technical field of the random access of wireless communication, in particular to a random access method in a long term evolution (LTE)-A system. The random access method comprises the following steps of: sending random access lead codes to a resident cell base station and a candidate service cell base station by edge user equipment; when random access response is received in a specified time window, sending a MSG 3 message to the corresponding base station; after the edge user equipment sends the MSG 3 message, judging whether a competitive solution message is received within preset time or not by the edge user equipment, if the competitive solution message is received, judging whether an identifier in the competitive solution message is matched with an identifier in the correspondingly-sent MSG 3 or not, and if the competitive solution message is not received, executing the withdrawal process according to the priority level, and issuing an access request to the corresponding base station again; and if the identifier in the competitive solution message is matched with the identifier in the correspondingly-sent MSG 3, sending a hybrid automatic repeat request (HARQ) confirming message to complete the random access. By the method, the success rate of the random access of edge users is improved, and the time delay of the random access is reduced.
Description
Technical field
The present invention relates to a kind of field of access technology at random of radio communication, particularly the accidental access method in a kind of LTE-A system.
Background technology
IMT-2000 (International Mobile Telecommunications-2000) is the global standards of the third generation radio communication of International Telecommunications Union's definition.IMT-Advanced (being abbreviated as IMT-A) system is the mobile system that has above the new ability of IMT-2000 ability.This system can provide telecommunication service widely: by the mobile service based on the advanced person who wraps transmission that increases day by day mobile and that fixed network is supported.
Inserting at random is the access procedure of terminal before beginning and network service, is the decisive link that guarantees that communication is set up.In LTE (Long Term Evolution, Long Term Evolution) system, insert the application of the initial registration, uplink synchronous and the user resources demand that are mainly used in the user etc. at random.Random access procedure directly has influence on the performance of system.The implementation of random access procedure is simple, is applicable to that the multiple access when system load is light inserts.When system loading increased, the user terminal number of connecting system was more, and the capacity of system can be badly damaged because of the frequent impact between the user.The LTE-A system requirements is realized the professional and wireless access freely of gapless, in order to realize this goal, require the node access technology should guarantee higher access success rate and lower access delay, satisfy QoS (Quality of Service, the network service quality) demand of different business again.Simultaneously the LTE-A system pays close attention to the performance of edge customer more, and the performance that will improve edge customer is as one of system's important indicator.
At present, prior art has proposed many improved accidental access methods, for example: based on the algorithm of time slot A LOHA; Based on the algorithm of resource reservation with based on the algorithm of dynamic-configuration random access channel resource; High-priority users is adopted the method for continuous two random access lead codes of transmission etc., insert the QoS that success rate guarantees different business to a certain extent at random though can improve, can not be suitable for the transmission mode of coordinate multipoint; Some access protocols based on cooperation transmission utilize the diversity performance of coordinate multipoint to solve collision problem at physical layer, have improved the access success rate, but this class access strategy is not all considered the QoS demand of different business.Simultaneously existing access priority determines that mode only decide according to type of service, and considers the purpose of access.
In the prior LTE system, based on the access process of competing at random as shown in Figure 1,
Step 101: random access lead code
The main purpose of targeting signal transmission is that appearance and the permission base station of access attempts are estimated the time delay between base station and the portable terminal at random for indicate the base station.Described time delay is estimated will be for step 102 to regulate uplink timing.
There are 64 available lead codes in each residential quarter.Mobile terminal device UE is used for PRACH (Physical Random Access Channel from 64-Ncf, Physical Random Access Channel) chooses one in the signature based on competition in, wherein Ncf is eNodeB (evolved NodeBase, be evolved base station, be abbreviated as eNB) be left for non-competing signature number.Be used for being subdivided into two son groups again based on the signature sequence of competition.Described mobile terminal device UE is according to the size that inserts MSG3 message at random, in corresponding random access lead code group A or random access lead code group B, select a lead code at random, according to the Initial Trans of protocol definition, in corresponding Random Access Channel, send.Because UE selects lead code at random, therefore, different UE may select identical random access lead code, and is sent to the base station in identical Random Access Channel.
Step 102: accidental access response (Random Access Response, RAR)
ENodeB sends accidental access response message at Physical Downlink Shared Channel, comprise the interim Cell Radio Network Temporary Identifier/Identity, Cell-RNTI that random access lead code sign, time shifts to an earlier date information, initial uplink mandate and distribute (T-C-RNTI, Temporary-Cell-RNTI).
If a plurality of UE are owing to selecting identical lead code to lead to a conflict in identical running time-frequency resource, they can receive RAR (accidental access response) separately.If UE does not receive a RAR in the time window that arranges, execution is kept out of the way, initiate random access procedure again.
Step 103:MSG3 message
UE receiving random access response message, if the random access lead code that comprises in accidental access response message sign is complementary with the random access lead code that sends, UE selects subframe according to the running time-frequency resource of access at random that distributes in the accidental access response message, and in the subframe transmission MSG3 message of selecting, carry competition and solve sign.Described MSG3 message is the definite request message of access at random, as RRC (Radio Resource control) linking request, tracking area update or dispatch request etc.This message has comprised the interim C-RNTI on the RAR in the step 102 (Cell Radio Network Temporary Identifier, Cell Radio Network Temporary Identifier/Identity, Cell-RNTI) and UE sign.If users different in the step 101 send identical lead code at identical running time-frequency resource, then clash.The UE of conflict can receive identical RAR, thereby obtains identical MSG3 message uplink time, causes MSG3 message phase mutual interference in this uplink time of conflict user, makes eNodeB not to be correctly decoded.
Step 104: competition solves message
The base station receives MSG3 message, and the judgement that is at war with is returned competition to UE and solved message.
Competition solves the sign that comprises the UE that successfully inserts in the message.If UE sign and the sign of self that UE detects in the competition solution message are complementary, then know successfully and insert; Otherwise UE thinks and bumps, and carries out backoff procedure, initiates new random access procedure again.
By said process as seen, existing random access procedure based on competition, if different UE has selected different random access lead codes respectively, initiate to insert at random at the identical running time-frequency resource of access at random, because the orthogonality between the lead code, the base station can reach the correct differentiation to UE at different lead codes, and distributes different access running time-frequency resources for different UE in the accidental access response message that returns to UE.It inserts MSG3 message to UE at random in the access running time-frequency resource transmission that distributes separately respectively then.Owing to insert the difference of running time-frequency resource, the MSG3 message that different UE sends each other can collision conflict, the base station can correctly receive the also MSG3 message of demodulation different UEs, thereby the UE that is respectively different distributes the required transfer of data running time-frequency resource of transfer of data separately, thereby completes successfully the process that inserts at random.If but different UE has selected identical random access lead code, initiate to insert at random at identical running time-frequency resource, like this, the base station only can detect UE and send this random access lead code, and can not distinguish the different UEs that sends this random access lead code correspondence, and at this random access lead code, for different UE distributes the identical running time-frequency resource of access at random, return identical accidental access response message; After UE receives accidental access response message, different UE will be on the identical running time-frequency resource of access at random, transmit MSG3 message separately simultaneously, the result causes the transmission collision between the MSG3 message, make the base station to carry out correct acceptance and demodulation to the MSG3 message of different UEs, thereby cause this failure that inserts at random, cause the access success rate at random of UE lower, for some important UE, lower insert success rate at random and will influence the transmission of its data service greatly.
Little by little, people begin to adopt in LTE back off algorithm to solve the transmission collision problem, and back off algorithm is the important component part of random access procedure, is to improve the another effective means that the user inserts success rate.Back off algorithm is applied to the network condition of dynamic change generally according to traffic load adaptively modifying back off time, improves systematic function.In back off algorithm, back off time generally is to select at random in the zero-sum maximum delay time, is called as backoff interval.Backoff interval is dynamically controlled by back off algorithm.Back off algorithm plays an important role at aspects such as reducing bag collision, raising transmission success rate and raising channel throughput.
What the back off algorithm among the existing LTE adopted is the back off algorithm of center control, decides backoff parameter by eNB.The UE end uses window mode to retransmit lead code, and the minimum value of its window is fixed, and the maximum of retransmission window is notified by eNB as backoff parameter.ENB passes to UE with backoff parameter BI (Backoff Index) in the step 102 that competition inserts at random.Its initial value is set to 0, if namely eNB does not pass to UE with backoff parameter, lead code will not done and keep out of the way, and transmit in the effective random access resource of the next one.
Yet the existing back off algorithm that determines backoff parameter by eNB can't be made a response rapidly according to system load varies, in time adjust backoff parameter, in underload or non-competing access procedure, still use back off algorithm, bring unnecessary time delay to access procedure undoubtedly, influenced access speed.
Summary of the invention
The present invention has overcome above-mentioned shortcoming, and the accidental access method in a kind of long evolving system is provided, and improves the access success rate at random of cell edge high-priority users, and reduces its access delay.
The present invention solves the technical scheme that its technical problem takes: the accidental access method in a kind of LTE-A system comprises the steps:
Edge customer equipment sends random access lead code to persistent district base station and candidate service cell base station respectively;
When edge customer equipment is received accidental access response in the official hour window, base station to correspondence sends MSG3 message, if the accidental access response that receives is second accidental access response, judge then whether the time of the MSG3 message that current accidental access response is indicated and the time of the transmission MSG3 of accidental access response indication for the first time have overlapping, have then only to send MSG3 message to the persistent district base station, otherwise send MSG3 message in the time of two accidental access response indications to two base stations respectively;
Described edge customer equipment is after sending MSG3 message, judge whether to receive in the given time that competition solves message, if receive then judgement that whether sign among the MSG3 that solves sign and corresponding transmission in the message that is at war with mates, if do not receive, after then carrying out backoff procedure, initiate to insert request again to respective base station;
Described competition solves the judged result whether sign among the MSG3 of sign and corresponding transmission in the message mates, if coupling is then sent the HARQ acknowledge message, finish at random and insert, if do not match then after carrying out backoff procedure, initiate to insert request again to respective base station.
When described edge customer equipment is received accidental access response in the official hour window, send to the base station in the step of MSG3 message, unique accidental access response that if the accidental access response that receives is edge customer equipment to receive, then the time of directly indicating in this accidental access response sends MSG3 message to the base station of correspondence.
At described edge customer equipment respectively after persistent district base station and candidate service cell base station send the step of random access lead code, if described edge customer equipment is not received accidental access response in the official hour window, and do not reach the default number of times upper limit of keeping out of the way, after then carrying out backoff procedure, again initiate to insert request to respective base station, if keep out of the way the number of times upper limit and reached, then with the access failure of base station.
Described backoff procedure is specially:
Edge customer equipment determines to keep out of the way the size of window according to priority level;
Select one in the window at random and keep out of the way delay in described keeping out of the way, keep out of the way by the time and initiate new round random access procedure again after postponing to finish.
Keeping out of the way window size is
Wherein BPV is the back off time that obtains in accidental access response, and N is priority number, and n is the priority of current edge customer equipment, and bracket indicates and rounds downwards.
The described priority level that inserts at random is to determine according to the type of service of the access purpose of described edge customer equipment and request.
Before described edge customer equipment sends the step of random access lead code to persistent district base station and candidate service cell base station respectively, also comprise judging whether described edge customer is the subscriber equipment of the priority of setting, if send random access lead code to persistent district base station and candidate service cell base station again.
The present invention is directed to the LTE-A system at edge customer, according to the access priority user, strategy and multiple accidental access method are kept out of the way in employing, being applied in load height and user uses under the situation of competition random access procedure access network, improve the success rate that inserts at random, reduced the time delay that inserts at random.In addition, the access priority foundation inserts purpose and QoS of survice grade classification, the more realistic system applies of division methods at random among the present invention.
Description of drawings
Fig. 1 is based on the figure of access process at random that competes in the prior art;
Fig. 2 is the applied scene schematic diagram of the present invention;
Fig. 3 is the flow chart of the preferred embodiment of the present invention.
Embodiment
As shown in Figure 2, be applied scene of the present invention, comprise adjacent cell base station C1, C2, C3, edge customer equipment UE 1, UE2 below in conjunction with this scene, are example with the access of edge customer equipment UE 1, and content of the present invention is elaborated.
A preferred embodiment of the present invention mainly realizes by following several stages, the specific implementation process as shown in Figure 3:
Phase I, whether the subscriber terminal equipment search also resides in the residential quarter, as step 301, judges then whether oneself is in cell edge, be edge customer equipment namely, as step 302.If active user's terminal equipment is not edge customer equipment, then insert (not indicating among the figure) at random by the accidental access method in the existing long evolving system; Otherwise, change step 303 over to, carry out second stage.
The present invention adopts SINR (Signal to Interference plus Noise Ratio, SINR are called for short Signal to Interference plus Noise Ratio) thresholding criterion to judge whether active user's terminal equipment is edge customer equipment.SINR thresholding of predefine at first, subscriber terminal equipment is determined the type of self according to its SINR at persistent district: the subscriber equipment centered by this equipment if the SINR that records is higher than this thresholding, on the contrary then be edge customer equipment (cell-edge UE).Formula specific as follows: (wherein 1 represent edge customer, 0 represents central user)
Reasonably the SINR thresholding can provide by emulation or actual measurement, is edge customer in order to judge which user.
Second stage, edge customer equipment UE judge that whether oneself is the subscriber equipment of the priority of setting, namely selects the edge customer equipment of the priority level with setting from edge customer equipment.As step 303, be to judge whether to be the high-priority users of ordering within front three in the present embodiment.If not high-priority users, then insert at random by the accidental access method in the existing long evolving system, namely to inserting less demanding subscriber equipment, only insert by existing access way at random; Otherwise, if the edge high-priority users of setting then changes step 304 over to, carry out the phase III.
The priority of UE is judged and can be judged from purpose and this two aspect of class of service of inserting at random.According to the LTE agreement, the purpose of Jie Ruing can be divided into following five classes at random:
1) the initial access at random that inserts of request;
2) access at random of Radio Resource control (RRC, Radio Resource Control) link process of reconstruction;
3) access at random in the handoff procedure;
4) during up " asynchronous " state, UE is in that Radio Resource control _ when connecting (RRC_CONNECTED) state, downlink data arrives the access of initiating at random;
5) during up " asynchronous " state, UE is when the RRC_CONNECTED state, and upstream data arrives the access of initiating at random.
On the other hand, 3GPP (third generation partner program) is divided into 4 big classes according to QoS with class of service: conversation class, Streaming Media class, interactive class and background classes at the mobile network.The main foundation of classification is professional susceptibility to time delay.Conversation class is very responsive to time delay, successively decreases successively, and background classes is least responsive to time delay.Session service and Streaming Media class business are mainly used in carrying real time business stream, wherein conversation class is used for transmitting the highstrung business of time delay (as VOIP:Voice over Internet Protocol, be the networking telephone), the Streaming Media class is used for the business (as VOD:Video On Demand, i.e. video on demand techniques) weak slightly to the sensitiveness of time delay.Interaction service and background business are mainly used in professional and other business data business of traditional Internet.Because they are lower to the requirement of time delay, can improve the reliability of data by chnnel coding error correction and retransmission mechanism.Interaction service requires to keep basic request--answer-mode, browse as WWW, and background business does not have mutual requirement, can be used for receiving and dispatching E-Mail and downloads data.The essential characteristic of each class of service and applicating example can be with reference to following tables.
Therefore, the decision method of the user access priority that is adopted by the above-mentioned the present invention of obtaining: (priority 1 is limit priority, successively decreases successively, and priority 6 is lowest priority) present embodiment judges namely whether UE is that priority is 1,2,3 edge customer equipment.
Phase III, the edge customer equipment UE is carried out the selection of candidate cell, as step 304.Edge customer equipment selects a residential quarter as candidate cell from neighbor cell according to the candidate cell selection algorithm.
Concrete steps are as follows:
1) with UE1 is example, measures the persistent district base station C2 signal strength signal intensity of neighbor cell base station C1, C3 etc. on every side, select the strongest cell base station C1 of signal strength signal intensity;
2) read the system broadcast message of this neighbor cell base station C1, comprising some relevant informations of the registration information in the system broadcast message, access service grade and base station physical layer, wherein register the relevant information that information and access service class information are recording the UE1 registration authority of described neighbor cell base station C1 and access service priority;
3) by registration information and access service priority and physical layer relevant information, judge according to following three Rule of judgment whether this neighbor cell meets the demands:
C1＝RXLEV-RXLEV_ACCESS_MIN-Max((MS_TXPWR_MAX_CCH-P)，0)。
In the following formula, RXLEV is the average level that UE1 receives; The minimum incoming level of RXLEV_ACCESS_MIN for allowing UE1 to insert; Spendable maximum transmit power level when MS_TXPWR_MAX_CCH is the UE1 connecting system; P is the peak power output of UE1.
If this neighbor cell C1 satisfies above three conditions, then execution in step 4); Otherwise, return step 1) and select signal strength signal intensity time strong neighbor cell C3 to restart step 2), 3);
4) determine that described neighbor cell C1 is candidate cell, UE1 safeguards and inserts the needed relevant information of this candidate cell.
Quadravalence section, edge customer equipment UE 1 are initiated two independently random access procedures to persistent district base station C2 and candidate cell base station C1 simultaneously.As long as have a random access procedure success at least, with regard to successful access network.In this stage, if the situation need keep out of the way re-transmission occurs, the back off algorithm of the priority of distinguishing according to second stage is carried out.
Detailed access process as shown in the step 305 among Fig. 3～315,
Step 305:UE1 is that persistent district base station C2 and candidate service cell base station C1 send random access lead code to main Serving cell respectively in adjacent subframe, begins two random access procedures.
Step 306: if UE1 receives the RAR response in an official hour window, then change step 307 over to; If receive RAR response, and do not reach the default number of times upper limit of keeping out of the way, then forward step 312 to, and if reached and kept out of the way the number of times upper limit, then with the access failure of base station.
Step 307:UE1 receives a RAR response that includes feeding back uplink mandate indication, and indication UE1 sends MSG3 message to the base station; First RAR response that if this RAR response is UE1 to receive, and in the RAR receive window, receive only this RAR response, then the time of directly indicating in this RAR sends MSG3 message to the base station of correspondence; Otherwise, if second RAR response that UE1 receives in the RAR receive window judges then whether the time that this RAR response indicates UE1 to send MSG3 message has overlapping with the time of receiving RAR indication UE1 transmission MSG3 for the first time, have, then forward 308 to, do not have, then forward 309 to.
Step 308:UE1 only sends MSG3 message to the base station C2 of main Serving cell, and cancellation sends the preparation of MSG3 message to the base station C1 of candidate service residential quarter.
Step 309:UE1 sends MSG3 message in the time of two RAR response indications to two base station C1, C2 respectively.
Step 310:UE1 starts competition and solves timer after sending MSG3 message at every turn, and monitoring receives whether competition solves message overtime, do not solve message if receive competition within the predetermined time, then forward step 312 to, solve message if receive competition, forward step 311 to.
Whether the sign in the competition solution message that step 311:UE1 judgement receives mates with the sign among the MSG3 of corresponding transmission, if do not match, forwards step 312 to, if coupling then forwards 313 to.
Step 312: according to the back off algorithm of distinguishing priority, after the execution backoff procedure, initiate to insert request again to respective base station.
Step 313:UE1 judges whether oneself had sent the HARQ acknowledge message, if sent, then forwards step 314 to, otherwise, forward step 315 to.
Step 314:UE1 has inserted a base station, illustrates that this access procedure finishes, and ignores the message of receiving this moment.
Step 315:UE1 sends the HARQ acknowledge message to the respective base station that receives competition solution message, and this access procedure is finished.
Wherein, if solving message, the competition that UE1 receives comes autonomous serving BS C2 in step 311, then in step 315, send the HARQ acknowledge message to main serving BS C2, if the competition that step 311 receives solves message from candidate base station C1, then in step 315, send the HARQ acknowledge message to candidate base station C1.
The back off algorithm based on the differentiation priority of LTE that relates in the step 317 of the present invention, 318 can be treated with a certain discrimination and various types ofly be inserted at random, thereby can satisfy the various dissimilar delay requirements that insert at random, make the access performance of system be further enhanced.Its specific algorithm is as follows.
The access priority at random of supposing the LTE system has 1,2 ..., N is total to N priority progression (N is 6 in the present embodiment), and wherein priority 1 is limit priority, successively decreases successively, and priority N is lowest priority.Suppose that simultaneously UE has obtained to keep out of the way index BI (Backoff Index) by eNB according to what cell load determined in accidental access response (RAR) before.Thus, UE can draw backoff parameter BPV (Backoff Parameter value) according to BI, also is back off time.
UE access network at random bumps and after failing, for example step 317,312,313 reads and keeps out of the way index BI, to judge whether to need to carry out back off algorithm.If this moment, the value of BI was 0, then the duty ratio of explanation residential quarter this moment is less, and UE need not to carry out back off algorithm, constantly directly initiates random access procedure again in the available access at random of the next one and gets final product.If the value of BI is non-zero, illustrate that then the load of residential quarter is not little, then need to carry out the following step of keeping out of the way:
At first, UE determines the priority level of access at random according to the type of service of the purpose that inserts at random and request.The UE that is about to keep out of the way carries out priority according to the type that inserts at random of failure before and judges (decision method is above set forth), thereby draws the priority level n that this inserts at random.
Then, UE determines to keep out of the way window size according to priority level n.The computing formula of keeping out of the way window size is as follows:
(bracket is represented to round downwards)
By formula as can be seen, the priority of Jie Ruing is more high at random, and it is more little that it keeps out of the way window, and it is less relatively to make that it keeps out of the way time delay, thereby can fast access into network.And the low access at random of priority, it is just relatively large that it keeps out of the way window, thereby make that its back off time just may be bigger, so just channel can be given demandingly to insert at random postponing, thereby satisfy various types of requirements that insert at random time delay.
At last, execution is kept out of the way.The same with the existing mode of keeping out of the way among the LTE, in the window that previous step is determined, select one to keep out of the way delay at random, after the wait back off time finishes, the random access procedure of initiating a new round again.
Among the present invention, at the LTE-A system at edge customer, according to the access priority user, strategy and multiple accidental access method are kept out of the way in employing, namely send the request of access to two cell base stations simultaneously, be applied in load height and user and use under the situation of competition random access procedure access network, improved the success rate that inserts at random.
And whether subscriber equipment of the present invention bump and detected by eNB, testing result inserted at random by competition pass to the UE that participates in the competition then.If UE detects the id information that conforms to own ID in the information of transmitting, then think and insert successfully, and proceed following step.If do not detect ID or detected ID and oneself do not meet.Then think and compete failure, keep out of the way.For system load is promptly made a response, in time adjust backoff parameter and adapt to load variations, thereby improve the performance of system.LTE is chosen in the accidental access response that competition inserts at random and transmits backoff parameter in the stage rather than by system information, has reduced the time delay that inserts at random.
In addition, in order to satisfy the little requirement of trying one's best of LTE random access procedure time delay, at underload or non-competing random access procedure, when this user's collision probability is little or collisionless, do not use back off algorithm.That is to say that in LTE, back off algorithm only is applied in the load height and the user uses under the situation of competition random access procedure access network, thereby greatly reduces the time delay of underload or non-competing random access procedure.
More than the accidental access method in the LTE-A provided by the present invention system is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (6)
1. the accidental access method in the LTE-A system is characterized in that, comprises the steps:
Edge customer equipment sends random access lead code to persistent district base station and candidate service cell base station respectively;
When edge customer equipment is received accidental access response in the official hour window, base station to correspondence sends MSG3 message, if the accidental access response that receives is second accidental access response, judge then whether the time of the MSG3 message that current accidental access response is indicated and the time of the transmission MSG3 of accidental access response indication for the first time have overlapping, have then only to send MSG3 message to the persistent district base station, otherwise send MSG3 message in the time of two accidental access response indications to two base stations respectively;
Described edge customer equipment is after sending MSG3 message, judge whether to receive in the given time that competition solves message, if receive then judgement that whether sign among the MSG3 that solves sign and corresponding transmission in the message that is at war with mates, if do not receive, after then carrying out backoff procedure, initiate to insert request again to respective base station;
Described competition solves the judged result whether sign among the MSG3 of sign and corresponding transmission in the message mates, if coupling is then sent the HARQ acknowledge message, finish at random and insert, if do not match then after carrying out backoff procedure, initiate to insert request again to respective base station.
2. the accidental access method in the LTE-A according to claim 1 system, it is characterized in that: at described edge customer equipment respectively after persistent district base station and candidate service cell base station send the step of random access lead code, if described edge customer equipment is not received accidental access response in the official hour window, and do not reach the default number of times upper limit of keeping out of the way, after then carrying out backoff procedure, again initiate to insert request to respective base station, if keep out of the way the number of times upper limit and reached, then with the access failure of base station.
3. the accidental access method in the LTE-A according to claim 1 and 2 system, it is characterized in that: described backoff procedure is specially:
The size that edge customer equipment determines to keep out of the way window according to the priority level that inserts at random;
Select one in the window at random and keep out of the way delay in described keeping out of the way, keep out of the way by the time and initiate new round random access procedure again after postponing to finish.
4. the accidental access method in the LTE-A according to claim 3 system, it is characterized in that: the described window size of keeping out of the way is
Wherein BPV is the back off time that obtains in accidental access response, and N is priority number, and n is the priority of current edge customer equipment, and bracket is represented to round downwards.
5. the accidental access method in the LTE-A according to claim 3 system, it is characterized in that: the described priority level that inserts at random is to determine according to the type of service of the access purpose of described edge customer equipment and request.
6. the accidental access method in the LTE-A according to claim 1 system, it is characterized in that: before described edge customer equipment sends the step of random access lead code to persistent district base station and candidate service cell base station respectively, also comprise judging whether described edge customer equipment is the subscriber equipment of the priority of setting, if send random access lead code to persistent district base station and candidate service cell base station again.
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| CN102573101A (en) * | 2012-02-13 | 2012-07-11 | 中国科学院计算技术研究所 | Random access method and apparatus of user equipment in LTE (Long Term Evolution) system |
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| CN101695196B (en) * | 2009-10-20 | 2011-08-31 | 普天信息技术研究院有限公司 | Method for increasing random access success rate under competition mode, system and device thereof |
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| WO2017052144A1 (en) * | 2015-09-25 | 2017-03-30 | Lg Electronics Inc. | Method for performing random access procedure in enhanced coverage mode in a wireless communication system and device therefor |
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