CN102448181B - TDD-LTE system contention resolved accidental access method - Google Patents
TDD-LTE system contention resolved accidental access method Download PDFInfo
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Abstract
The present invention relates to wireless communication field, in particular to a kind of TDD-LTE system contention resolved accidental access method, physical layer directly judges after receiving RAR, and need not and protocol stack between carry out data transmission again, therefore interaction times between physical layer and protocol stack is also reduced, and reduces the processing delay of Stochastic accessing, and protocol stack and physical layer alternately play the part of master control and auxiliary role wherein, reduce the degree of coupling and the complexity of both sides, be beneficial to exploitation and safeguard.
Description
Technical field
The present invention relates to wireless communication field, particularly TDD-LTE system contention resolved accidental access method, i.e. the interactive processing mode of user terminal physical layer and protocol stack.
Background technology
The transmitting-receiving process of the physical layer primary responsibility baseband signal of time division multiplexing long evolving system (being called for short TDD-LTE), protocol stack is responsible for assembling and the parsing of high-level signaling.In TDD-LTE system, random access procedure is used for UE end and initiates access foundation request to network terminal, obtains network terminal access and runs the process of permitting.Because multiple different user may adopt same targeting sequencing initiating random access procedure at synchronization, therefore there will be the situation of random access request competition.According to whether there is contention resolved relation, TDD-LTE system random access procedure can be divided into contention resolved Stochastic accessing and non-competing solution Stochastic accessing, and contention resolved random access procedure as shown in Figure 1, comprises the steps:
Step 1: send targeting sequencing (PRACH).
Step 2: receiving random access response message (RAR).
Step 3: assembling sends contention resolved message (MSG3).
Step 4: receive contention resolved message (MSG4).
Non-competing solution random access procedure does not have step 4 to receive contention resolved message (MSG4) process.
The application scenario of contention resolved random access procedure be initiate after initial random access, uplink loss Stochastic accessing, switch time Stochastic accessing etc.The Stochastic accessing of initiating when the application scenario of non-competing solution random access procedure is and switches.In contention resolved random access procedure, different UE may choose same targeting sequencing ID at synchronization and send, and for the Stochastic accessing application distinguishing which UE is actually accepted, needs to add corresponding contention resolved judgment mechanism.And for non-competing solution Stochastic accessing, because different UEs can not be chosen same targeting sequencing number and send, so would not there is the situation of contention resolved by synchronization.
China Patent Publication No. CN101742682 discloses a kind of LTE system contention resolved accidental access method, leading delivery time is calculated by protocol stack, notify that when the moment arrives physical layer carries out leading transmission, physical layer directly reports protocol stack after receiving accidental access response message, judge whether it is the RAR that this UE is corresponding by protocol stack, when be judged as non-UE RAR or send window outdated protocols stack trigger next access procedure.When RAR resolves correctly, protocol stack can assemble MSG3 message, and sends in the resource entrained by RAR.Physical layer monitors contention resolved message, after detecting, reported protocol stack, and the judgement of the solution that is at war with by protocol stack, is judged as that the contention resolved timer expiry of failure or protocol stack handles then initiates a random access procedure again by protocol stack; Be judged as successfully namely showing Stochastic accessing success.Idiographic flow as shown in Figure 2,
Step 101: protocol stack issues leading configuration information and leading transmission running time-frequency resource information.Start contention resolved random access procedure.
Step 102: physical layer generating leader sequence.
Step 103: when leading delivery time arrives, send leading.
Step 104: physical layer opens the reception of RAR.
Step 105: physical layer judges whether to receive RAR, is, RAR is reported protocol stack, performs step 106; Otherwise, go to step 107.
Step 106: protocol stack judges that whether this RAR is this UE, is go to step 108; Otherwise, degree variables cumulative 1 will be accessed, go to 115.
Step 107: physical layer judges whether RAR receiver window finishes, and is, physical layer enters states such as stopping, otherwise, go to step 104.
Step 108: protocol stack judges whether RAR receiver window finishes, and is, will access number counter cumulative 1, go to step 115; Otherwise go to step 104.
Step 109: protocol stack assembling MSG3 is handed down to physical layer, opens contention resolved timer.
Step 110: physical layer sends MSG3.
Step 111: physical layer receives contention resolved message (MSG4).
Step 112: whether protocol stack detects contention resolved timer overtime then will represent to go to step 115 by the variable cumulative 1 of access number of times.
Step 113: physical layer judges whether to receive MSG4, is, reports protocol stack; Otherwise, go to step 108.
Step 114: determine whether contention resolved success, be, identifies this random access procedure success; Otherwise, will represent and go to step 115 by the variable cumulative 1 of access number of times.
Step 115: judge whether access number of times accumulator exceedes maximum access number of times, is, mark random access failure; Otherwise, go to step 101,
As mentioned above, existing processing method physical layer and protocol stack reciprocal process complexity; Physical layer receive non-distribute to the RAR of oneself after need first data to be reported protocol stack, after being judged by protocol stack, then trigger next time new access; Need protocol stack again to initiate new access after contention resolved timer expiry, these processes both increase time delay and the resource overhead of process, make the exploitation of physical layer and protocol stack and maintenance difficulties large.
Summary of the invention
Technical problem solved by the invention is to provide a kind of TDD-LTE system contention resolved accidental access method, for solving the time delay of physical layer and protocol stack reciprocal process complex process and resource overhead is large, and exploitation and the large problem of maintenance difficulties.
For overcoming the above problems, the present invention proposes a kind of TDD-LTE system contention resolved accidental access method, comprising:
The configuration parameter of leading transmission is only handed down to physical layer by protocol stack, and physical layer calculates leading delivery time voluntarily, and carries out the generation of targeting sequencing, and when the moment arrives, physical layer carries out leading transmission;
Physical layer resolves this RAR after receiving accidental access response message RAR, and judges whether it is this user's; If so, then by the RAR information reporting that parses to protocol stack; If not judging whether after then shared record Stochastic accessing being initiated the variable cumulative 1 of number of times to exceed largest random access number of times, is identify random access failure, otherwise trigger a new access process and without notification protocol stack;
Protocol stack assembling contention resolved message MSG3 is handed down to physical layer, opens contention resolved timer; Whether overtimely detect contention resolved timer;
Physical layer sends MSG3; Receive contention resolved message MSG4.
Preferably, protocol stack assembling MSG3 is handed down to physical layer; Physical layer opens contention resolved timer;
Physical layer, after reception contention resolved message (MSG4), judges that whether competition detection timer is overtime, if timer expiry, then physical layer directly initiates once new Stochastic accessing and without notification protocol stack.
Preferably, described physical layer is calculated leading delivery time voluntarily, and carry out the generation of targeting sequencing, when the moment arrives, physical layer carries out leading transmission, replace with: physical layer determines whether first time Stochastic accessing, be calculate leading transmission running time-frequency resource, and relevant information deposited and shows; Otherwise, from the table deposited, select corresponding running time-frequency resource information; Take out corresponding targeting sequencing in the targeting sequencing district that physical layer keeps in advance from sheet, when leading delivery time arrives, send leading.
Compared with prior art, physical layer of the present invention directly judges after receiving RAR, and need not and protocol stack between carry out data transmission again, therefore interaction times between physical layer and protocol stack is also reduced, reduce the processing delay of Stochastic accessing, protocol stack and physical layer alternately play the part of master control and auxiliary role wherein, reduce the degree of coupling and the complexity of both sides, are beneficial to exploitation and safeguard.
Accompanying drawing explanation
Fig. 1 is prior art TDD-LTE system contention resolved Stochastic accessing interaction figure
Fig. 2 is prior art TDD-LTE system contention resolved accidental access method flow chart
Fig. 3 is TDD-LTE system contention resolved accidental access method preferred implementation flow chart of the present invention
Fig. 4 is another preferred implementation flow chart of TDD-LTE system contention resolved accidental access method of the present invention
Embodiment
Clearly understand to make object of the present invention, technical scheme and advantage, below in conjunction with drawings and the embodiments, TDD-LTE contention resolved accidental access method of the present invention is described in further detail, known implementation no longer describes in detail, to avoid there is unnecessary obscuring with content of the present invention.
Fig. 3 is the contention resolved accidental access method execution mode one that the present invention proposes.
The configuration parameter of leading transmission is only handed down to physical layer by protocol stack, calculates leading delivery time voluntarily by physical layer, and carries out the generation of targeting sequencing, and when the moment arrives, physical layer carries out leading transmission; Physical layer resolves this RAR after receiving RAR, and judges whether it is this user's; If so, then by the RAR information reporting that parses to protocol stack; If not judging whether after then shared record Stochastic accessing being initiated the variable cumulative 1 of number of times to exceed largest random access number of times, is identify random access failure, otherwise trigger a new access process and without notification protocol stack.Specifically comprise:
Step 201: protocol stack issues leading configuration information, starts contention resolved random access procedure.
Step 202: physical layer calculates leading transmission running time-frequency resource.
Step 203: physical layer generating leader sequence, when leading delivery time arrives, sends leading.
Step 204: physical layer receives RAR.
Step 205: physical layer judges whether to receive RAR, is, then perform step 206; Otherwise, go to step 207.
Step 206: physical layer determines whether the RAR of this UE, is, by the RAR information reporting that parses to protocol stack, goes to step 208.
Step 207: physical layer judges whether RAR receiver window finishes, and is, will access degree variables cumulative 1, go to step 215, otherwise, go to step 204.
Step 208: protocol stack assembling MSG3 is handed down to physical layer, opens contention resolved timer.
Step 209: physical layer sends MSG3.
Step 210: physical layer receives contention resolved message (MSG4).
Step 211: whether protocol stack detects contention resolved timer overtime, is then to access number of times shared variable cumulative 1, goes to step 214.
Step 212: physical layer judges whether to receive MSG4, is, reports protocol stack; Otherwise, go to step 210.
Step 213: determine whether contention resolved success, be, identifies this random access procedure success; Otherwise, will represent and perform step 214 by the shared variable cumulative 1 of access number of times.
Step 214: judge whether access number of times accumulator exceedes maximum access number of times, is, mark random access failure; Otherwise, go to step 201,
Step 215: judge whether access number of times accumulator exceedes maximum access number of times, is, mark random access failure; Otherwise, go to step 202,
Compared with prior art, this programme resolves this RAR after physical layer receives RAR, and directly judge whether it is this user's, and protocol stack need not be sent to, judged by protocol stack, its beneficial effect resides in reduced the interaction times between protocol stack and physical layer, reduces the processing delay of again initiating a Stochastic accessing when RAR resolves unsuccessfully, decrease the degree of coupling between physical layer and protocol stack, the exploitation being convenient to protocol stack and physical layer is debugged simultaneously.
Fig. 4 is the contention resolved accidental access method execution mode two that the present invention proposes, it improves execution mode one, by physical layer but not protocol stack handles contention resolved overtime timer, and then do the whether overtime judgement of contention resolved timer by physical layer, if timer expiry, then physical layer directly initiates once new Stochastic accessing and without notification protocol stack.Specifically comprise:
Step 301: protocol stack issues leading configuration information, starts contention resolved random access procedure.
Step 302: physical layer calculates leading transmission running time-frequency resource.
Step 303: physical layer generating leader sequence, when leading delivery time arrives, sends leading.
Step 304: physical layer receives RAR.
Step 305: physical layer judges whether to receive RAR, is, performs step 306; Otherwise, go to step 307.
Step 306: the RAR determining whether this UE, is, by the RAR information reporting that parses to protocol stack, goes to step 308
Step 307: physical layer judges whether RAR receiver window finishes, and is, will access degree variables cumulative 1, go to step 315, otherwise, go to step 304.
Step 308: protocol stack assembling MSG3 is handed down to physical layer.Physical layer opens contention resolved timer.
Step 309: physical layer sends MSG3.
Step 310: physical layer receives contention resolved message (MSG4).
Step 311: physical layer judges whether to receive MSG4, is, reports protocol stack, goes to step 313.
Step 312: whether physical layer detects contention resolved timer overtime, is then to access number of times shared variable cumulative 1, goes to step 315.Otherwise go to step 310.
Step 313: protocol stack determines whether contention resolved success, is, identifies this random access procedure success.Otherwise number of times shared variable cumulative 1 will be accessed, perform step 314.
Step 314: judge whether access number of times accumulator exceedes maximum access number of times, is, mark random access failure; Otherwise, go to step 301.
Step 315: judge whether access number of times accumulator exceedes maximum access number of times, is, mark random access failure; Otherwise, go to step 302.
Compare with execution mode one, the beneficial effect of present embodiment is: directly can initiate a new Stochastic accessing immediately after physical layer detects contention resolved time-out, reduce the processing delay of initiating a new Stochastic accessing, decrease the mutual expense between physical layer and protocol stack.
The present invention proposes contention resolved accidental access method execution mode three, its to the step 202 in execution mode one, 203 and execution mode two in step 302,303 improve.
Consider to optimize the memory data output expense outside sheet, the data deposited are the data before FFT, the data of each leading No. ID corresponding 4096*16bit, LTE has 64 leading ID of difference, so total amount of storage is 4096*64*16=262144*16bit, relatively and the capacity of MEM, this expense is acceptable.During owing to again initiating Stochastic accessing, leading configuration parameter can not change, and change is only needing leading No. ID again random of selection one, and the change of running time-frequency resource.Therefore when Stochastic accessing first, the relevant running time-frequency resource of Stochastic accessing is calculated fully, and deposits in the form of a table, like this when again initiating Stochastic accessing just can with inquire about this table and obtain corresponding running time-frequency resource information, and need not to recalculate again.More existing scheme, the beneficial effect of the program is: the mode adopting the targeting sequencing that prestores, and makes physical layer without the need to doing complicated targeting sequencing baseband signal generation step; Simultaneously, when first time Stochastic accessing, the running time-frequency resource used by follow-up Stochastic accessing is repeatedly precalculated out, without the need to calculating when making follow-up initiation Stochastic accessing, above-mentioned 2 processing delay decreasing physical layer, simplify the realization flow of physical layer.
Concrete improvement step is:
Step 402: physical layer determines whether first time Stochastic accessing, is calculate leading transmission running time-frequency resource, and relevant information is deposited and shows; Otherwise, from the table deposited, select corresponding running time-frequency resource information.
Step 403: take out corresponding targeting sequencing in the targeting sequencing district that physical layer keeps in advance from sheet, when leading delivery time arrives, sends leading.
The present invention has carried out further detailed description for execution mode or embodiment to the object, technical solutions and advantages of the present invention; be understood that; above lifted execution mode or embodiment are only the preferred embodiment of the present invention; not in order to limit the present invention; all any amendments made for the present invention within the spirit and principles in the present invention, equivalent replacement, improvement etc., all should be included within scope.
Claims (4)
1. a TDD-LTE system contention resolved accidental access method, is characterized in that, comprising:
The configuration parameter of leading transmission is only handed down to physical layer by protocol stack, and physical layer calculates leading delivery time voluntarily, and carries out the generation of targeting sequencing, and when the moment arrives, physical layer carries out leading transmission;
Physical layer resolves this RAR after receiving accidental access response message RAR, and judges whether it is this user's; If so, then by the RAR information reporting that parses to protocol stack; If not judging whether after then shared record Stochastic accessing being initiated the variable cumulative 1 of number of times to exceed largest random access number of times, is identify random access failure, otherwise trigger a new access process and without notification protocol stack;
Protocol stack assembling contention resolved message MSG3 is handed down to physical layer, opens contention resolved timer; Whether overtimely detect contention resolved timer;
Physical layer sends MSG3; Receive contention resolved message MSG4.
2. contention resolved accidental access method as claimed in claim 1, is characterized in that, after protocol stack assembling MSG3 is handed down to physical layer, opens contention resolved timer by physical layer.
3. contention resolved accidental access method as claimed in claim 2, it is characterized in that, physical layer, after reception contention resolved message MSG4, judges that whether contention resolved timer is overtime, if timer expiry, then physical layer directly initiates once new Stochastic accessing and without notification protocol stack.
4. contention resolved accidental access method as claimed in claim 1, it is characterized in that, described physical layer is calculated leading delivery time voluntarily, and carry out the generation of targeting sequencing, when the moment arrives, physical layer carries out leading transmission, replaces with: physical layer determines whether first time Stochastic accessing, is, calculate leading transmission running time-frequency resource, and relevant information is deposited in table; Otherwise, from the table deposited, select corresponding running time-frequency resource information; Take out corresponding targeting sequencing in the targeting sequencing district that physical layer keeps in advance from sheet, when leading delivery time arrives, send leading.
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| WO2022141277A1 (en) * | 2020-12-30 | 2022-07-07 | Oppo广东移动通信有限公司 | Random access method, and electronic device and storage medium |
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| CN101102605A (en) * | 2007-08-15 | 2008-01-09 | 中兴通讯股份有限公司 | Random access method of cellular wireless communication system |
| CN101370270A (en) * | 2007-08-13 | 2009-02-18 | 中兴通讯股份有限公司 | Accidental access method for honeycomb wireless communication system |
| CN101742682A (en) * | 2008-11-12 | 2010-06-16 | 中兴通讯股份有限公司 | Random access method between terminal and base station in LTE system |
| EP2205037A1 (en) * | 2009-01-02 | 2010-07-07 | LG Electronics Inc. | Random access scheme for user equipment |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101370270A (en) * | 2007-08-13 | 2009-02-18 | 中兴通讯股份有限公司 | Accidental access method for honeycomb wireless communication system |
| CN101102605A (en) * | 2007-08-15 | 2008-01-09 | 中兴通讯股份有限公司 | Random access method of cellular wireless communication system |
| CN101742682A (en) * | 2008-11-12 | 2010-06-16 | 中兴通讯股份有限公司 | Random access method between terminal and base station in LTE system |
| EP2205037A1 (en) * | 2009-01-02 | 2010-07-07 | LG Electronics Inc. | Random access scheme for user equipment |
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