CN102858022B - Random accessing method, wireless communication system, wireless terminal and base station - Google Patents
Random accessing method, wireless communication system, wireless terminal and base station Download PDFInfo
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Abstract
The invention provides a random accessing method, a wireless communication system, an antenna terminal and a base station. The wireless communication system comprises the base station and the wireless terminal; the random accessing method in the wireless communication system comprises the following step: in the wireless terminal, first information for the first random access or second information for the second random access is selected.
Description
The application is the applying date is on August 10th, 2007, and application number is 200780100236.0, and denomination of invention is the divisional application of the application for a patent for invention of " accidental access method in wireless communication system, wireless communication system, wireless terminal and base station apparatus ".
Technical field
The present invention relates to the accidental access method in wireless communication system, wireless communication system, wireless terminal and base station apparatus.The present invention is highly suitable for such as next generation mobile communication system.
Background technology
About mobile communication system such as mobile phones, current, third generation mode based on CDMA mode starts service, and by 3GPP(3rd Generation Partnership Project: third generation partner program) (R) advance the research (see non-patent literature 1 described later) of the next generation mobile communication system (LTE:Long Term Evolution, Long Term Evolution) that can carry out more high-speed communication.Wherein, except the high speed of transfer rate, also discuss the reduction of transmission delay.
In mobile communication system, when base station apparatus (evolved Node B:eNB) starts to communicate with the mobile station apparatus (User Equipment:UE) as wireless terminal, preparation is needed to start the channel carrying out sending most for UE.In 3 gpp, be referred to as Random Access Channel (RACH), the communication of RACH started step and be called Stochastic accessing (see non-patent literature 2 described later).
The minimal information for being identified by eNB from the transmission of UE is comprised in RACH.In addition, RACH is used when communicating and starting, and uses individual channel (or shared channel), thus uses so long as not multiple UE simultaneously, just jointly can use each other at UE in communication after this.So in RACH, application is called as the identifier of signature, and thus, eNB can be identified by the UE that RACH sends simultaneously.
Stochastic accessing performs in following four kinds of situations, that is: (1) sends the situation of just secondary data; (2) situation of uplink synchronous is set up when producing downlink data; (3) when producing upstream data, request sends the situation of upstream data; (4) perform when switching and obtain synchronous situation with mobile destination base station.Further, be " descending " (down link: DL) from eNB to the direction of UE, its rightabout is up (up link: UL).
Here, (1) send just secondary data time and (3) send upstream data time, UE uses (Contention Based Random Access Procedure: the random access procedure based on competing) from Stochastic choice one among the signature (leading) that can use.Therefore, although probability is lower, but also likely cause multiple UE to use identical signature to send simultaneously.
On the other hand, signature is separately distributed to UE in advance by eNB when (2) downlink data sends, when (4) switch also due to once produce signature conflict, connect insantaneous break or the cut-out that communicates according to occasion, thus apply the method (Non-contention Based RandomAccess Procedure: the random access procedure based on non-competing) of in advance UE that will switch being distributed to signature separately.
A () is based on the random access procedure of competition
Figure 20 represents the example of the Stochastic accessing step of the situation for above-mentioned (1) and (3) that above-mentioned non-patent literature 2 is recorded.
When producing upstream data, UE sends to comprise the message (Random Access Preamble: random access guiding) of the signature of Stochastic choice #1-1(is up to eNB by RACH and sends request) (step S101).Now, multiple UE can use identical signature to start to send simultaneously, may compete.Even if but compete, at the ID of this stage eNB also effective UE of None-identified, the competition creating signature between which UE therefore cannot be learned.
Receive above-mentioned message #1-1(to sign) eNB by response message (Random Access Response: the accidental access response) #1-2 for the above-mentioned message #1-1 received and the synchronizing signal for uplink communication, send to permit etc. together with carry out replying (step S102).This response message #1-2 replies to the plurality of UE when multiple UE is sent by RACH simultaneously.
Next, the UE receiving above-mentioned response message #1-2 sends our station ID by message (Scheduled Transmission: scheduled transmission) #1-3, asks the scheduling (step S103) of UL communication to eNB.
ENB is by receiving this message #1-3, thus below the ID(of the effective UE of identifiable design is also referred to as Termination ID), therefore identifiable design goes out the competition creating signature between which UE, if create competition, send message (Contention Resolution: contention resolved) #1-4 to this UE, thus the solution be at war with (step S104).
B () is based on non-competing random access procedure
The example of the Stochastic accessing step (random access procedure based on non-competing) when what Figure 21 represented that above-mentioned non-patent literature 2 records be used in above-mentioned (2) and (4).
First, eNB distributes signature (step S201) separately to the UE carrying out managing in advance by message (Random Access Preamble assignment: random access guiding distributes) #2-1.
UE uses the independent signature distributed by above-mentioned message #2-1 by eNB, carries out UL synchronization request to eNB.That is, UE sends the message #2-2(step S202 comprising signature separately to eNB by RACH).
ENB after receiving this message #2-2, by for this message response message #2-3 be used for uplink communication synchronizing signal, send to permit etc. together with reply (step S203).
Non-patent literature 1:3GPP, and " Requirements for Evolved UTRA(E-UTRA) and EvolvedUTRAN(E-UTRAN) ", TR25.913 V7.3.0, Release 7, March 2006
Non-patent literature 2:3GPP, " Evolved Universal Terrestrial Radio Access(E-UTRA) andEvolved Universal Terrestrial Radio Access Network(E-UTRAN) ", TS36.300, Release8, V8.1.0, June 2007
As mentioned above, in non-patent literature 2, have studied two kinds of processes about Stochastic accessing, thus such as when above-mentioned (2) produce downlink data time set up uplink synchronous situation and above-mentioned (3) produce upstream data time carry out upstream data send request, process different from each other is carried out simultaneously.
As above, when carrying out various process respectively simultaneously, then in each process, need independent resource (above-mentioned signature etc.), thus process may be assigned with two kinds of signatures among carrying out, and causes the use of signature to waste.
Summary of the invention
One of the object of the invention is, energy selectivity performs any one in above-mentioned multiple Stochastic accessing.
In addition, one of the object of the invention is also, realizes effective utilization of the resources such as the signature used in above-mentioned Stochastic accessing.
Further, be not limited to above-mentioned purpose, obtain the action effect brought by each structure shown in embodiment described later, the action effect that namely cannot be obtained by prior art also can be used as one of other objects of the present invention.
For reaching above-mentioned purpose, the present invention uses " accidental access method in wireless communication system, wireless communication system, wireless terminal and base station apparatus " as follows.
(1) namely, accidental access method in wireless communication system of the present invention is the accidental access method of the wireless communication system with base station apparatus and wireless terminal, wherein, above-mentioned wireless terminal detect for the 1st information of the 1st Stochastic accessing and receive from above-mentioned base station apparatus the 2nd information for the 2nd Stochastic accessing time, select any one in above-mentioned 1st information and above-mentioned 2nd information.
(2) can be configured to herein, in above-mentioned wireless terminal, above-mentioned 1st information generates with the generation towards the upstream data of above-mentioned base station apparatus, and above-mentioned 2nd information is with receiving from above-mentioned base station apparatus towards the generation of the downlink data of above-mentioned wireless terminal from above-mentioned base station apparatus.
(3) in addition, can also be configured to, above-mentioned wireless terminal, among the process of a kind of Stochastic accessing of the information selected by using or after terminating, implements the transmission of the 3rd information sending to above-mentioned base station apparatus in the process of non-selected another kind of Stochastic accessing.
(4) and then, can also be configured to, above-mentioned wireless terminal stops the carrying out of above-mentioned 2nd Stochastic accessing, among the process of above-mentioned 1st Stochastic accessing, send to above-mentioned base station apparatus using asking to set up the synchronous uplink synchronization request information of uplink communication in order to downlink data receiving as above-mentioned 3rd information.
(5) in addition, can also be configured to, above-mentioned wireless terminal stops the carrying out of above-mentioned 2nd Stochastic accessing, among the process of above-mentioned 2nd Stochastic accessing or after terminating, the upstream data transmission request information that request upstream data sends is sent to above-mentioned base station apparatus as above-mentioned 3rd information.
(6) and then, can also be configured to, above-mentioned uplink synchronization request information is given in the upstream message that should be sent to above-mentioned base station apparatus in the process of above-mentioned 1st Stochastic accessing.
(7) in addition, can also be configured to, above-mentioned upstream data transmission request information is given in the upstream message that should be sent to above-mentioned base station apparatus in above-mentioned 2nd random access procedure.
(8) and then, can also be configured to, above-mentioned base station apparatus detect from above-mentioned wireless terminal reception to above-mentioned 1st information and distribute to above-mentioned wireless terminal the existence of above-mentioned 2nd information after, when from above-mentioned wireless terminal reception to above-mentioned 3rd information, discharge the management of above-mentioned 1st information or above-mentioned 2nd information.
(9) in addition, accidental access method in wireless communication system of the present invention is the accidental access method of the wireless communication system with base station apparatus and wireless terminal, wherein, above-mentioned wireless terminal is before generating the 1st information for the 1st Stochastic accessing with the generation towards the upstream data of above-mentioned base station apparatus, with the generation from the downlink data of above-mentioned base station apparatus, the 2nd information being used for the 2nd Stochastic accessing is received from above-mentioned base station apparatus, among the process of above-mentioned 2nd Stochastic accessing using above-mentioned 2nd information or after terminating, implement the transmission sending to the 3rd information of above-mentioned base station apparatus in the process of above-mentioned 1st Stochastic accessing.
(10) and then, wireless communication system of the present invention is the wireless communication system with base station apparatus and wireless terminal, wherein, above-mentioned wireless terminal select to be used for the 1st Stochastic accessing the 1st information and from above-mentioned base station apparatus receive for any one the 2nd information of the 2nd Stochastic accessing, the management of above-mentioned base station apparatus release to non-selected above-mentioned information in above-mentioned 1st information and above-mentioned 2nd information.
(11) in addition, wireless terminal of the present invention has: generation unit, and it generates the 1st information being used for base station apparatus being carried out to the 1st Stochastic accessing; Receiving element, it receives the 2nd information being used for above-mentioned base station apparatus being carried out to the 2nd Stochastic accessing from above-mentioned base station apparatus; And selected cell, it selects any one in above-mentioned 1st information and above-mentioned 2nd information.
(12) here, can also be configured to, this wireless terminal also has transmitting element, this transmitting element maintains and carries out a kind of Stochastic accessing corresponding with the information selected by above-mentioned selected cell, implements the transmission of the 3rd information sending to above-mentioned base station apparatus in the process of the another kind of Stochastic accessing do not selected by above-mentioned selected cell.
(13) in addition, can also be configured to, above-mentioned selected cell selects above-mentioned 1st information, above-mentioned transmitting element, among the process of above-mentioned 1st Stochastic accessing, sends to above-mentioned base station apparatus using asking to set up the synchronous uplink synchronization request information of uplink communication in order to downlink data receiving as above-mentioned 3rd information.
(14) and then, can also be configured to, above-mentioned selected cell selects above-mentioned 2nd information, and the upstream data transmission request information that request upstream data sends, among the process of above-mentioned 2nd Stochastic accessing, is sent to above-mentioned base station apparatus as above-mentioned 3rd information by above-mentioned transmitting element.
(15) in addition, can also be configured to, above-mentioned transmitting element is given to above-mentioned uplink synchronization request information and should sends in the upstream message of above-mentioned base station apparatus in the process of above-mentioned 1st Stochastic accessing.
(16) and then, can also be configured to, above-mentioned transmitting element is given to above-mentioned upstream data transmission request information and should sends in the upstream message of above-mentioned base station apparatus in the process of above-mentioned 2nd Stochastic accessing.
(17) in addition, base station apparatus of the present invention has: administrative unit, its management from wireless terminal reception to the 1st information for the 1st Stochastic accessing and send to the 2nd information for the 2nd Stochastic accessing of above-mentioned wireless terminal; Judgement unit, its according to from above-mentioned wireless terminal reception to the 3rd information, differentiate have selected in above-mentioned 1st information and above-mentioned 2nd information which; And control unit, it maintains a kind of Stochastic accessing corresponding with being determined as a kind of information of having selected by above-mentioned judgement unit, implements the control corresponding with above-mentioned 3rd information.
(18) here, can also be configured to, when above-mentioned 3rd information is that when asking to set up the synchronous uplink synchronization request information of uplink communication in order to downlink data receiving, above-mentioned judgement unit is determined as and have selected above-mentioned 1st information in above-mentioned wireless terminal.
(19) in addition, can also be configured to, when above-mentioned 3rd information is the upstream data transmission request information of request upstream data transmission, above-mentioned judgement unit is determined as and have selected above-mentioned 2nd information in above-mentioned wireless terminal.
(20) and then, can also be configured to, above-mentioned control unit discharges above-mentioned administrative unit is determined as non-selected another kind of information management to above-mentioned judgement unit.
According to the invention described above, can select to perform any one in above-mentioned multiple Stochastic accessing.
In addition, can be implemented in effective utilization of the resources such as the signature that uses in above-mentioned Stochastic accessing.The interference of Random Access Channel (RACH) can also be suppressed.
Accompanying drawing explanation
Fig. 1 is the functional block diagram of the base station (eNB) that first embodiment of the present invention relates to.
Fig. 2 is the functional block diagram of the mobile radio station (UE) that first embodiment of the present invention relates to.
Fig. 3 is the sequence chart that the Stochastic accessing step (method) that first embodiment of the present invention relates to is described.
The flow chart of the work of eNB when Fig. 4 is the Stochastic accessing step enforcement shown in key diagram 3.
The flow chart of the work of UE when Fig. 5 is the Stochastic accessing step enforcement shown in key diagram 3.
Fig. 6 is the sequence chart that the situation that different random access step is carried out simultaneously is described.
Fig. 7 is the sequence chart that the Stochastic accessing step (method) that second embodiment of the present invention relates to is described.
The flow chart of the work of eNB when Fig. 8 is the Stochastic accessing step enforcement shown in key diagram 7.
The flow chart of the work of UE when Fig. 9 is the Stochastic accessing step enforcement shown in key diagram 7.
Figure 10 is the sequence chart of the 1st variation that the 2nd execution mode is described.
Figure 11 is the sequence chart of the 2nd variation that the 2nd execution mode is described.
Figure 12 is the sequence chart that the Stochastic accessing step (method) that third embodiment of the present invention relates to is described.
The flow chart of the work of eNB when Figure 13 is the Stochastic accessing step enforcement illustrated shown in Figure 10.
The flow chart of the work of UE when Figure 14 is the Stochastic accessing step enforcement illustrated shown in Figure 10.
Figure 15 is the sequence chart that the Stochastic accessing step (method) that fourth embodiment of the present invention relates to is described.
The flow chart of the work of eNB when Figure 16 is the Stochastic accessing step enforcement illustrated shown in Figure 13.
The flow chart of the work of UE when Figure 17 is the Stochastic accessing step enforcement illustrated shown in Figure 13.
Figure 18 is the sequence chart that the Stochastic accessing step (method) that fifth embodiment of the present invention relates to is described.
Figure 19 is the sequence chart that the Stochastic accessing step (method) that sixth embodiment of the present invention relates to is described.
Figure 20 is the sequence chart that existing Stochastic accessing step (the Stochastic accessing step based on competition) is described.
Figure 21 is the sequence chart that existing Stochastic accessing step (the Stochastic accessing step based on non-competing) is described.
Symbol description:
10 base stations (eNB); 11 antennas; 12 receiving and transmitting parts; 13 buffer part; 14 detection units; 15 signature management departments; 16 RRM portions; 20 mobile radio stations (UE); 21 antennas; 22 receiving and transmitting parts; 23 buffer part; 24 signature management departments; 25 access detection units; 26 identifier assigning unit
Embodiment
Below, with reference to accompanying drawing, embodiments of the present invention are described.Wherein, the invention is not restricted to execution mode shown below, certainly can carry out various distortion to implement without departing from the scope of the subject in the invention.
[1] the 1st execution mode
Fig. 1 is the functional block diagram of the base station apparatus (eNB) that first embodiment of the present invention relates to, and Fig. 2 is the functional block diagram of the mobile station apparatus (UE) that first embodiment of the present invention relates to, and constitutes wireless communication system by these eNB 10 and UE 20.Further, eNB 10 and UE 20 can exist multiple in above-mentioned wireless communication system.In addition, about the structure shown in these Fig. 1 and Fig. 2, unless otherwise specified, be also just same in the 2nd afterwards to the 4th execution mode.And then the base station apparatus 10 in this example is set to the eNB in the LTE of part or all function possessing radio network control apparatus (RNC), also can be compare LTE to be in last generation (function of unassembled RNC) base station.In addition, as long as define based on the Stochastic accessing step of competition and the base station based on non-competing these two kinds of methods of Stochastic accessing step, can be just the base station of any system.
(explanation of eNB)
About the eNB 10 shown in Fig. 1, be conceived to the function of its major part, such as, there is antenna 11, receiving and transmitting part, buffer part 13, detection unit 14, signature management department 15, RRM portion 16.
At this, antenna 11 receives the up-link wireless signal from UE 20, and sends downstream wireless signals towards UE 20.This antenna 11, simultaneously for transmitting-receiving, also can be arranged in transmission with in receiving respectively.
Receiving and transmitting part (transmitting element, receiving element) 12 carries out predetermined reception process to the up-link wireless signal received by antenna 11, and carries out predetermined transmission processing to the data (downlink data) from buffer part 13.
Above-mentioned reception process such as comprises: low noise amplification, to carry out to base band frequency frequency inverted (changing downwards), Gain tuning, based on the demodulation of predetermined demodulation mode, the decoding etc. based on predetermined decoding process.On the other hand, above-mentioned transmission processing comprises: the generation of the coding using predetermined coded system to carry out above-mentioned upstream data, the modulation using predetermined modulation system (QPSK and 16QAM etc.) to carry out coded data, predetermined radio frames, carry out frequency inverted (upwards changing), power amplification etc. to wireless frequency.Above-mentioned radio frames such as can the radio frames of criteria in application OFDMA and OFDMA.
Buffer part 13 temporarily keeps the downlink data mailing to UE 20 under the control of signature management department 15, detection unit (judgement unit) 14 has following function: according to having been carried out the upstream data (message) receiving process by receiving and transmitting part 12, determine whether to request UL synchronization request and UL dispatch request from UE 20, differentiate in UE 20, to have selected stochastic signature and which separately in signature.
Further, in this example, stochastic signature refers to the signature (the 1st information) of stochastic generation in UE 20, and signature refers to and distributes (transmission) to the signature of UE 20 (the 2nd information) by eNB 10 separately.In addition, detailed above-mentioned judgement (differentiation) gimmick can be described after.
Signature management department (administrative unit) 15 manages the signature (Random AccessPreamble: random access guiding) (being also referred to as leading below) for Stochastic accessing (process), and generate and send to the downstream message of the UE 20 being used in Stochastic accessing, also possess UE 20 is signed distribution, release function.Further, above-mentioned release implements according to the result of determination of detection unit 14.
RRM portion 16 manages the Radio Resource of UL and DL for communicating with UE 20 (also comprising communication during Stochastic accessing) [channel frequency and time (receiving and dispatching timing) etc.] and distributing, such as when above-mentioned OFDMA, possesses the function that the configuration (mapping) of two dimension transmitting-receiving region (being called as pulse train) specified by sub-channel frequencies and symbol time is managed.
In addition, this RRM portion 16 also plays function as the control unit implementing the control corresponding with upstream message (the 3rd information), and this upstream message should receive from UE 20 with corresponding random access procedure of signing non-selected in UE 20.
(explanation of UE)
On the other hand, about the UE 20 shown in Fig. 2, be conceived to the function of its major part, such as, there is antenna 21, receiving and transmitting part 22, buffer part 23, signature management department 24, access detection unit 25, identifier assigning unit 26.
Wherein, antenna 21 receives the downstream wireless signals from eNB 10, and sends up-link wireless signal to eNB 10.This antenna 21, also simultaneously for transmitting-receiving, also can be arranged in transmission with in receiving respectively.
Receiving and transmitting part (transmitting element, receiving element) 22 carries out predetermined reception process to the downstream wireless signals received by antenna 21, and to the data (upstream data) from buffer part 23 with carry out predetermined transmission processing through the upstream message (random access guiding and scheduled transmission message) that identifier assigning unit 26 issues eNB.
In UE 20, above-mentioned reception process such as comprises: low noise amplification, to carry out to base band frequency frequency inverted (changing downwards), Gain tuning, based on the demodulation of predetermined demodulation mode, the decoding etc. based on predetermined decoding process.On the other hand, above-mentioned transmission processing comprises: the coding using predetermined coded system to carry out above-mentioned upstream data, the modulation using predetermined modulation system (QPSK and 16QAM etc.) to carry out coded data, multiplexing (mapping) of carrying out upstream data to predetermined radio frames, to carry out frequency inverted (upwards changing), power amplification etc. to wireless frequency.
Buffer part 23 temporarily keeps the upstream data mailing to eNB 10 under the control of signature management department 24, and signature management department 24 manages the signature (random access guiding) being used for Stochastic accessing process (process).
Access detection unit 25 generates with signature management department 24 predetermined message being used in Stochastic accessing step collaboratively, wherein, access detection unit 25 has following function: monitor whether (confirmations) creates the multiplexing distribution of signature, namely whether there is the stochastic signature of stochastic generation the independent signature that distributes from eNB 10 and our station (signature management department 24), and when multiplexing distributions, which makes sign is effective in judgement.
Identifier assigning unit 26 possesses the function of the upstream message (such as the message etc. of notification terminal ID) mailing to eNB 10 generated by access detection unit 25 being given to following message and information (identifier or mark etc.), this message asks to send the message of upstream data (UL scheduling), and this information represents the UL confirmation of synchronization also had both for arriving eNB 10 and UL synchronization request required in downlink data receives due to downlink data.Further, so-called UL confirmation of synchronization refers to that UE 20 notifies to eNB 10 situation that (confirmation response) is such: correctly have received the UL timing information from eNB 10, thus can guarantee that UL is synchronous.
(explanation of Stochastic accessing step)
Below, the work (Stochastic accessing step) of the wireless communication system of this example is as constructed as above described in detail with reference to Fig. 3 ~ Fig. 5.And, Fig. 3 is the sequence chart of the Stochastic accessing step (method) that this example is described, Fig. 4 is the flow chart of the work when Stochastic accessing step implementing this example is described in eNB 10, and Fig. 5 is the flow chart of the work when Stochastic accessing step implementing this example is described in UE 20.
And, in the same manner as the token of Figure 20 and Figure 21, in after this describing, the message of mark shown in #1-1 ~ #1-4 represents that the message of mark shown in #2-1 ~ #2-3 represents originally in the message based on use in non-competing Stochastic accessing step (the 2nd Stochastic accessing) originally in Stochastic accessing step (the 1st Stochastic accessing) the middle message used based on competition.
First, if create upstream data and this upstream data is held in the step B1 of buffer part 23(Fig. 5 in UE 20), then UE 20 generates and stores stochastic signature (random access guiding) (the step B2 of Fig. 5) by signature management department 24.That is, signature management department 24 possesses the function as generation unit, and this generation unit is created on the signature used in the Stochastic accessing based on competition producing and should perform when mailing to the upstream data of eNB 10.
Then, UE 20 generates random access preamble message (up send request) #1-1 comprising this signature by access detection unit 25, send to the step S1a of eNB 10(Fig. 3 and the step B3 of Fig. 5 via receiving and transmitting part 22 from antenna 21).
If eNB 10 receives the above-mentioned up #1-1 that sends a request message, then reply response message (accidental access response) #1-2 for the received above-mentioned up #1-1 that sends a request message, also send the synchronizing signal being used for uplink communication simultaneously and send (the step S2 of Fig. 3) such as licenses.This response message #1-2 can be responded to the plurality of UE 20 when having carried out transmission by RACH by multiple UE 20 simultaneously.
At this, before this response message of transmission #1-2, in eNB 10, the reasons such as this reception process cannot be terminated, the above-mentioned up #1-1 that sends a request message of thus None-identified UE 20 transmission because the downlink data mailing to UE 20 arrives (there is downlink data buffer part 13) (steps A 1 of Fig. 4) from epigyny device.
In this case, eNB 10 carries out by the destination UE20 that signature management department 15 generates and stores above-mentioned downlink data the signature (signing separately: the 2nd information) (steps A 2 of Fig. 4) that Stochastic accessing (UL synchronization request) should use, and this being signed separately by signature assignment messages (random access guiding distributions) #2-1 sends to the step S1b of above destination UE 20(Fig. 3 and the steps A 3 of Fig. 4 via receiving and transmitting part 12).
Terminating to send the step S1a of these up #1-1(Fig. 3 that send a request message) and the step S1b of signature assignment messages #2-1(Fig. 3) stage, eNB 10 None-identified " which UE 20 signs which in use ".That is, which UE of None-identified 20 is released two signatures (Random Preamble and Dedicated Preamble: leading and Special leader at random).This is because, in above-mentioned non-patent literature 2, in which message, do not comprise the information (Termination ID) identifying UE 20.
According to above-mentioned non-patent literature 2, Termination ID can be contained in message (scheduled transmission) #1-3, therefore in this case can identify in eNB 10 which UE 20 employ which signature should be at the step S3 receiving this message #1-3(Fig. 3 from UE 20) after.
On the other hand, in UE 20, have nothing to do in whether giving eNB 10 by the Termination ID of our station 20 notice, terminating to send the step S1a of the up #1-2(Fig. 3 that sends a request message) and the step S1b of signature assignment messages #2-1(Fig. 3) stage, can identify that (detections) goes out to exist stochastic signature (leading at random) that our station generates and the generation from both independent signatures (Dedicated Preamble: Special leader) of eNB10 distribution, i.e. above-mentioned two kinds of Stochastic accessing.
As above, when having issued multiple signature to a UE 20, UE 20 has judged to use which signature.Namely, if UE 20 exists the distribution (reception) (the step B4 of Fig. 5) from the independent signature of eNB 10 in above-mentioned steps S2, then access detection unit 25 and be confirmed whether with signature management department 24 the multiplexing distribution (the step B5 of Fig. 5) creating two sign (leading) collaboratively.
Its result, if create multiplexing distribution (step B5's is branch), then UE 20(accesses detection unit 25) ignore the independent signature (the step S1c of Fig. 3 and the step B6 of Fig. 5) distributed from eNB 10, the stochastic signature that our station generates is chosen as effective signature.That is, access detection unit 25 possesses the function as selecting the selected cell of any one in above-mentioned two signatures.Further, when not producing multiplexing distribution, the stochastic signature that our station generates is effectively (the no branch of step B5) in UE 20.
Thus, the Stochastic accessing step (the Stochastic accessing step based on competition) based on the stochastic signature generated in UE 20 is effectively, and UE 20 proceeds the Stochastic accessing step based on competition.
That is, UE 20 generating messages #1-3 and send to the step S3 of eNB 10(Fig. 3 and the step B7 of Fig. 5).Now, UE 20 recognizes by the reception of above-mentioned signature assignment messages #2-1 the downlink data mailing to our station and reaches eNB 10, thus will represent that the information (identifier or mark) of " also doubling as the UL confirmation of synchronization needed for downlink data receiving " is given to this message #1-3 and sends preferably by identifier assigning unit 26.So-called UL confirmation of synchronization refers to and to confirm following situation and respond: UE 20 proper reception of the UL timing information be contained in message (accidental access response) #1-2, thus can guarantee the situation that UL is synchronous.
That is, non-selected based on non-competing random access procedure in the UL synchronization request of eNB 10 (the 3rd information) should be sent to be for receiving UL timing information with the message making UL synchronous from eNB 10, but UE 20 by select based on competition random access procedure #1-2 in obtain this timing information.So, can obtain the synchronous situation of UL to notify to eNB 10, UL confirmation of synchronization being given to the message #1-3 that should send and sending to eNB 10 again.
Wherein, due to described above when receiving message #1-3, eNB 10 can identify by double allocation the UE 20 of signature, even if therefore clearly do not give above-mentioned identifier or mark, also can give tacit consent to and be judged as having both UL synchronization request from the message #1-3 of this UE 20.
In eNB 10, if recognize the reception steps A 4 of the Fig. 4 (be branch) of above-mentioned message (having both UL confirmation of synchronization) #1-3, then detection unit 14 is judged as the independent signature distributing to this UE 20 (stochastic signature generated in UE 20 is preferential) out in the cold in this UE 20, and thus in signature management department 15, the independent signature (the step S3-1 of Fig. 3 and the steps A 5 of Fig. 4) of this UE 20 is distributed in release.
Therefore, stop the Stochastic accessing step of the independent signature distributed based on eNB 10 (the Stochastic accessing step based on non-competing), the independent signature of UE 20 can be distributed in the midway of Stochastic accessing step (early) release, effective utilization of signing can be realized.And, when being identified as (situation no in steps A 4) when above-mentioned message #1-3 has both UL confirmation of synchronization, then belong to downlink data not arrive and the situation only creating common upstream data communication, thus eNB 10 carries out the transmission (steps A 7) of message #1-4.
In addition, eNB 10 starts the process (control) corresponding with above-mentioned UL confirmation of synchronization (the 3rd information), the scheduling (steps A 6 of Fig. 4) of such as downlink data by RRM portion 16.
In addition, eNB 10, by receiving above-mentioned message (UL confirmation of synchronization of holding concurrently) #1-3, can identify and can not send response (random access guiding) to signature assignment messages #2-1 from UE 20, therefore can avoid vainly again sending signature assignment messages #2-1.And then have nothing to do with the distribution carrying out signing separately, eNB 10 is received in the message #1-3 used in the Stochastic accessing step based on competition, therefore can identify the situation also creating upstream data in UE 20.
ENB 10 is by receiving above-mentioned message (having both UL confirmation of synchronization) #1-3, the ID of effective UE 20 can be learned, therefore, it is possible to identify the competition creating signature between which UE, contention resolved (Contention Resolution) message #1-4 is sent to corresponding UE 20, thus the solution be at war with (the step S4 of Fig. 3).
As mentioned above, according to the accidental access method of this example, even if there is the UE 20 creating upstream data and downlink data in the phase same time, this UE 20 also can select the signature generated by our station, proceed the Stochastic accessing based on competition, therefore, such as shown in Fig. 6, there will not be above-mentioned two kinds of Stochastic accessing steps to proceed to last situation to any one UE 20 simultaneously.Therefore, it is possible to simplify the level of control of Stochastic accessing, effective utilization of the signature for Stochastic accessing can also be realized.And then, the interference of Random Access Channel (RACH) can also be suppressed.
Wherein, above-mentioned two kinds of Stochastic accessing steps also can be carried out each other simultaneously.Therefore, such as, when #1-3 and other UE competes above-mentioned message (having both UL confirmation of synchronization), UE 20, by referring to the contention resolved message #1-4 notified from eNB 10, knownly creates competition.Now, if proceed, based on non-competing Stochastic accessing, synchronously and then comparatively to need the time in order to ensure UL, therefore also can use the independent signature distributed from eNB 10 by above-mentioned message #2-1, perform based on non-competing Stochastic accessing simultaneously.But, now need the valid expiration date of the independent signature for this UE 20 to set longer.
In addition, based among the proceeding of non-competing Stochastic accessing, owing to being sent in the non-selected information (UL confirmation of synchronization) based on eNB 10 should be sent in the process of non-competing Stochastic accessing to eNB 10, thus the transmission processing of upstream data and the reception process of downlink data reliably can be implemented in the lump.
And then, above-mentioned UL synchronization request shares with the upstream message #1-3 being sent to eNB 10 in the selected process based on the Stochastic accessing competed, thus without the need to preparing (definition) independent upstream message in UL confirmation of synchronization, effective utilization of Radio Resource can be realized.
In addition, in this example, compare the 2nd execution mode described later, the message number of receiving and dispatching between eNB 10 and UE 20 can be cut down, thus effectively utilizing further, by the shortening resending the errors repair that control (HARQ:Hybrid Automatic Repeat reQuest, mixed automatic retransfer) causes of Radio Resource can be realized.
[2] the 2nd execution modes
Fig. 7 is the sequence chart that the Stochastic accessing step that second embodiment of the present invention relates to is described, Fig. 8 is the flow chart of the work in the eNB 10 when illustrating that Stochastic accessing step of the second embodiment is implemented, and Fig. 9 is the flow chart of the work in the UE 20 when illustrating that Stochastic accessing step of the second embodiment is implemented.
In present embodiment, when creating above-mentioned leading multiplexing distribution, UE 20 ignores the signature (the 1st information) generated by our station, selects the independent signature (the 2nd information) distributed from eNB 10.Therefore, can proceed based on non-competing Stochastic accessing step.
First, if create upstream data and this upstream data is held in the step B11 of buffer part 23(Fig. 9 in UE 20), then UE 20 generates and stores stochastic signature (random access guiding) (the step B12 of Fig. 9) by signature management department 24, comprise the up of this signature by the generation of access detection unit 25 and send request (random access guiding) message #1-1, send from antenna 21 to eNB 10 (the step S1a of Fig. 7 and the step B13 of Fig. 9) via receiving and transmitting part 22.
If eNB 10 receives the above-mentioned up #1-1 that sends a request message, then by for received above-mentioned up response message (accidental access response) #1-2 sent a request message with for uplink communication synchronizing signal with send permit wait together with carry out replying (the step S2 of Fig. 7).This response message #1-2 is responded to the plurality of UE 20 when multiple UE 20 is sent by RACH simultaneously.
At this, in this example, before this response message #1-2 sends, in eNB 10, the reasons such as this reception process cannot be terminated, the above-mentioned up #1-1 that sends a request message that None-identified UE 20 sends because the downlink data mailing to UE 20 arrives (there is downlink data buffer part 13) (steps A 11 of Fig. 8) from epigyny device.
In this case, eNB 10 carries out by the destination UE20 that signature management department 15 generates and stores above-mentioned downlink data the signature (signing separately) (steps A 12 of Fig. 8) that Stochastic accessing (UL synchronization request) should use, and this being signed separately by signature assignment messages (random access guiding distributions) #2-1 sends to the step S1b of above destination UE 20(Fig. 7 and the steps A 13 of Fig. 8 via receiving and transmitting part 12).
The UE 20 receiving above-mentioned signature assignment messages #2-1 sends the step S2a comprising message (random access guiding) the #2-2(Fig. 7 of the independent signature distributed by eNB 10 to eNB 10 by RACH).
At this, in UE 20, terminating to send the step S1a of the up #1-1(Fig. 7 that sends a request message) and the step S1b of signature assignment messages #2-1(Fig. 7) stage, the situation of the stochastic signature that there is our station generation and independent both the signatures distributed by eNB 10 can be identified.
So UE 20 judges to use which signature.Namely, if the signature that the UE of this example 20 exists from eNB 10 in above-mentioned steps S2 distributes (the step B14 of Fig. 9), then access detection unit 25 and be confirmed whether with signature management department 24 the multiplexing distribution (the step B15 of Fig. 9) creating two sign (leading) collaboratively.
Its result, if create multiplexing distribution (step B15's is branch), then UE 20 ignores the stochastic signature (sending to the signature of eNB 10) (the step S1d of Fig. 7 and the step B16 of Fig. 9) that our station generates, and the independent signature distributed by eNB10 is chosen as effective signature.Further, when not producing multiplexing distribution, independent signature is also effective (the no branch of step B15).
Thus, the Stochastic accessing step (the Stochastic accessing step based on non-competing) of the independent signature distributed based on eNB 10 proceeds.
After this, UE 20 generating messages #1-3 and send to the step S3 of eNB 10(Fig. 7 and the step B17 of Fig. 9).Now, because UE 20 also produces upstream data, thus will represent that the information (identifier or mark) of " also having both for asking the message of the transmission of upstream data (scheduling) (UL dispatch request) " is given to this message #1-3 and sends preferably by identifier assigning unit 26.
That is, eNB 10 is sent to again by the UL synchronization request of eNB 10 (the 3rd information) being sent to be given to the message #1-3 mailing to eNB 10 in the process of the non-selected Stochastic accessing based on competition.
But due to when receiving message #1-3, eNB 10 can identify by double allocation the UE 20 of signature, even if therefore clearly do not give above-mentioned identifier or mark, also can give tacit consent to and be judged as having both UL synchronization request from the message #1-3 of this UE 20.
In eNB 10, if recognize above-mentioned message #1-3(to have both UL confirmation of synchronization) the reception steps A 14 of the Fig. 8 (be branch), then can be judged as that the independent signature distributing to this UE 20 is effective in this UE 20, thus discharge in signature management department 15 and receive and the stochastic signature managed (the step S3-2 of Fig. 7 and the steps A 15 of Fig. 8) from this UE 20.
Therefore, the Stochastic accessing step (the Stochastic accessing step based on competition) based on the stochastic signature of UE 20 generation is invalid (stopping), at the midway of Stochastic accessing step (early) release stochastic signature, can realize effective utilization of signing.
Then, eNB 10 implements the allocation of radio resources of UL by RRM portion 16, as the process (control) (steps A 16 of Fig. 8) corresponding with above-mentioned UL dispatch request.Further, this example is that signature is effective example separately, is therefore only limitted to this UE 20, does not need the transmission of contention resolved message #1-4 in the Stochastic accessing step based on competition and can be stopped (the step S4 of Fig. 7 and the steps A 17 of Fig. 8).In addition, when identify above-mentioned message #1-3 have both UL dispatch request when, eNB 10 ends process (the no branch of the steps A 14 of Fig. 8).
As mentioned above, according to the accidental access method of this example, even if there is the UE 20 that the phase same time creates upstream data and downlink data, UE 20 also can select the signature distributed by eNB 10, proceed based on non-competing Stochastic accessing, therefore also there will not be above-mentioned two kinds of Stochastic accessing steps to proceed to last situation to certain UE 20 in this case simultaneously.Therefore, it is possible to simplify the level of control of Stochastic accessing, effective utilization of the signature for Stochastic accessing can also be realized.And then, the interference of RACH can also be suppressed.
In addition, when based among the proceeding of non-competing Stochastic accessing, the information (UL confirmation of synchronization) of eNB 10 should be sent to because UE 20 to be sent in eNB 10 in the process of the non-selected Stochastic accessing based on competition, thus reliably can implement the transmission processing of upstream data and the reception process of downlink data in the lump.
And then, the above-mentioned UL synchronization request of eNB 10 and upstream message #1-3 are shared, thus without the need to preparing (definition) independent upstream message in UL confirmation of synchronization, effective utilization of Radio Resource can be realized.
And, among the above-mentioned 1st and the 2nd execution mode, contemplate after have sent the up #1-1 that sends a request message from UE 20 to eNB 10, signature allocation request message #2-1 is sent from eNB 10 to UE 20, even if but when have sent these message #1-1, #2-1 in reverse order, because the multiplexing distribution this point producing signature can not become, as long as thus make any one signature effectively.
(2.1) the 1st variation
Such as shown in Figure 10, the message doubled as the UL dispatch request of above-mentioned eNB 10 also can be message (Random Access Preamble: the random access guiding) #2-2 sent in the step S2a of above-mentioned Fig. 7.
In this case, because UE 20 is without the need to sending message #1-3, the transmission (step S3) of this message #1-3 therefore can be stopped.Therefore, it is possible to avoid waste to send upstream message, effective utilization of ascending wireless resource (bandwidth) can be realized.
In addition, in eNB 10, which uses leading, therefore also without the need to discharging leading (without the need to performing the step S3-2 of Fig. 7) owing to not receiving message #1-3 and just can not identify (namely cannot manage) which UE 20.Therefore, the processing load of the leading management in eNB 10 can be alleviated.
(2.2) the 2nd variation
And then, the request of dispatching for the UL of above-mentioned eNB 10 can not proceeding to send based on during non-competing Stochastic accessing step, such as shown in Figure 11, also after this step terminates (from eNB 10 to after UE 20 sends message #2-3), can send (the step S5 of Figure 11) together with the response (ack/nack signal) to message #2-3.After transmission message #2-3, can also send as independent upstream message.
[3] the 3rd execution modes
Figure 12 is the sequence chart that the Stochastic accessing step that third embodiment of the present invention relates to is described, Figure 13 is the flow chart of the work of eNB 10 when illustrating that Stochastic accessing step of the third embodiment is implemented, and Figure 14 is the flow chart of the work of UE 20 when illustrating that Stochastic accessing step of the third embodiment is implemented.
Present embodiment is different from the 1st and the 2nd execution mode, by illustrate UE 20 is assigned with separately signature state under to create the situation of upstream data at UE 20.
Namely, be present in buffer part 13 when the downlink data mailing to UE 20 arrives eNB 10(downlink data from epigyny device) time (steps A 21 of Figure 13), then eNB 10 is generated and stored by signature management department 15 and carries out by the destination UE 20 of above-mentioned downlink data the signature (signing separately) (steps A 22 of Figure 13) that Stochastic accessing (UL synchronization request) should use, and is distributed by signature assignment messages #2-1(random access guiding) via receiving and transmitting part 12 by this separately signature send to the step S11 of above destination UE 20(Figure 12 and the steps A 23 of Figure 13).
If UE 20 receives above-mentioned signature assignment messages #2-1, then store by signature management department 24, manage the independent signature (the step B21 of Figure 14) as above distributed.
After this, if create upstream data and this upstream data is held in the step B22 of buffer part 23(Figure 14 in UE 20), then UE 20(signs management department 24) generation (the step S12 of Figure 12 and the step B23 of Figure 14) of stochastic signature can not be carried out as the 1st and the 2nd execution mode.
Replace, UE 20 generates by access detection unit 25 UL synchronization request (random access guiding) the message #2-2 comprising the independent signature distributed by eNB 10, sends to eNB 10 from antenna 21 via receiving and transmitting part 22.
Now, UE 20 can produce upstream data, and the information (identifier or mark) of therefore giving expression " also doubling as UL dispatch request " by identifier assigning unit 26 to this message #2-2 carries out sending (the step S13 of Figure 12 and the step B24 of Figure 14) again.
That is, when performing Stochastic accessing when UE 20 uses and produces downlink data for the signature obtaining (foundation) uplink synchronous, in the lump UL dispatch request is also sent to eNB 19.
If recognize above-mentioned message #2-2(to hold concurrently UL dispatch request in eNB 10) the reception steps A 24 of the Figure 13 (be branch), the allocation of radio resources then passing through the RRM portion 16 enforcement UL corresponding with this UL dispatch request controls (steps A 25 of Figure 13), generate the response message #2-3 to above-mentioned message #2-2 by signature management department 15, send to the step S14 of UE 20(Figure 12).And, when not comprising UL dispatch request in above-mentioned UL synchronization request message #2-2 (situation being no in the steps A 24 of Figure 13), belong to the situation only producing common upstream data communication, thus eNB 10 does not carry out UL Resourse Distribute and carries out the transmission (steps A 26 of Figure 13) of message #2-3.
As mentioned above, according to the accidental access method of this example, the downlink data of UE 20 is mail to and after eNB 10 is assigned with signature to this UE 20 when producing in eNB 10, if create upstream data at this UE 20, then UE 20 can not carry out the generation of the signature for the Stochastic accessing based on competition, but the signature using eNB 10 to distribute proceeds based on non-competing Stochastic accessing, thus above-mentioned two kinds of Stochastic accessing steps can not be carried out simultaneously.
Therefore, it is possible to simplify the level of control of Stochastic accessing, effective utilization of the signature for Stochastic accessing can also be realized.In addition, in UE 20 and eNB 10 all without the need to managing above-mentioned two kinds of signatures all the time.
And then, when proceed above-mentioned based on non-competing Stochastic accessing time, owing to being sent in the information (UL dispatches confirmation) that should send to eNB 10 in the process based on the Stochastic accessing of competition to eNB 10, thus the transmission processing of upstream data and the reception process of downlink data reliably can be implemented in the lump.
In addition, because random access preamble message #2-2 also doubles as UL dispatch request, therefore compare the 4th execution mode described later (to accidental access response message #2-3 should indeed response message double as the situation of UL dispatch request), upstream data can be cut down and send the delay before starting.
[4] the 4th execution modes
Figure 15 is the sequence chart that the Stochastic accessing step that fourth embodiment of the present invention relates to is described, Figure 16 is the flow chart of the work of eNB 10 when illustrating that Stochastic accessing step of the fourth embodiment is implemented, and Figure 17 is the flow chart of the work of UE 20 when illustrating that Stochastic accessing step of the fourth embodiment is implemented.
Present embodiment is identical with the 3rd execution mode, illustrates under the state having allocated independent signature in advance to UE 20, creates the situation of upstream data in UE 20.
Namely, when mailing to the downlink data of UE 20 from (buffer part 13 exists downlink data) (steps A 31 of Figure 16) when epigyny device arrival eNB 10, then eNB 10 is generated and stored by signature management department 15 and carries out by the destination UE 20 of above-mentioned downlink data the signature (signing separately) (steps A 32 of Figure 16) that Stochastic accessing (UL synchronization request) should use, and is distributed by signature assignment messages #2-1(random access guiding) via receiving and transmitting part 12 by this separately signature send to the step S11 of above destination UE 20(Figure 15 and the steps A 33 of Figure 16).
If UE 20 receives above-mentioned signature assignment messages #2-1, then the independent signature as above distributed is stored by signature management department 24, manages (the step B31 of Figure 17).
Afterwards, if produce upstream data and this upstream data is held in (the step B32 of Figure 17) in buffer part 23 in UE 20, then UE 20(signs management department 24) generation (the step S12 of Figure 15 and the step B33 of Figure 17) of stochastic signature can not be carried out as the 1st and the 2nd execution mode.
Replace, UE 20 generates by access detection unit 25 the UL synchronization request message #2-2(random access guiding comprising the independent signature distributed by eNB 10), send to the step S13 of eNB 10(Figure 15 and the step B34 of Figure 17 from antenna 21 via receiving and transmitting part 22).
In eNB 10, if recognize the reception steps A 34 of the Figure 16 (be branch) of above-mentioned message #2-2, the distribution (steps A 35 of Figure 16) of the Radio Resource of UL is then implemented by RRM portion 16, generate the response message #2-3 to above-mentioned message #2-2 by signature management department 15, send to the step S14 of UE 20(Figure 15).Further, when the above-mentioned message #2-2(of None-identified doubles as UL dispatch request) reception when, eNB 10 ends process (the no branch of the steps A 34 of Figure 16).
On the other hand, if UE 20 receives the step S34 of above-mentioned response message #2-3(Figure 17 from eNB 10), then generate confirmation response (ACK/NACK) the message #3 to it by message detection unit 25 and send to eNB 10.Now, UE 20 will represent that the information (identifier or mark) of " also doubling as UL dispatch request " is given to this confirmation response message #3 and carries out sending (the step B35 of Figure 17) again by identifier assigning unit 16.Further, can not send with confirmation response message #3 simultaneously, but be sent by independent upstream message.
That is, when UE 20 use produce downlink data time for the signature that obtains uplink synchronous to when performing Stochastic accessing, that terminates at this Stochastic accessing sends UL dispatch request afterwards to eNB.
As mentioned above, according to the accidental access method of this example, when creating the downlink data that mails to UE 20 and after being assigned with signature by eNB 10 to this UE 20 in eNB 10, if create upstream data in this UE 20, then UE 20 does not generate the signature for the Stochastic accessing based on competition, but use the signature distributed by eNB 10 to proceed based on non-competing Stochastic accessing, the effect identical with the 3rd execution mode or advantage can be obtained.
In addition, in this example, owing to doubling as UL dispatch request to the confirmation response message #3 of accidental access response message #2-3, even if so correctly cannot be received by eNB 10 due to communication environments, identify this confirmation response message #3, the transmission of downlink data also at least normally can be started.
Further, the upstream message doubling as UL dispatch request such as can as by CQI to the upstream data of eNB 10.
[5] the 5th execution modes
Figure 18 is the sequence chart that the Stochastic accessing step that fifth embodiment of the present invention relates to is described.This example sends example when signature assignment messages (random access guiding distribution) #2-1 after being response message (accidental access response) #1-2 that have sent UE 20 by eNB10.
That is, if create upstream data at UE 20, then UE 20 generates stochastic signature by signature management department 24, sends random access preamble message (up send request) the #1-1(step S1a comprising this stochastic signature to eNB 10).
If eNB 10 receives above-mentioned message #1-1, then response message (accidental access response) #1-2 for the above-mentioned up #1-1 of sending a request message received and the synchronizing signal for uplink communication are carried out replying (step S2) together with sending and permitting to wait.This response message #1-2 is responded to the plurality of UE 20 when multiple UE 20 is sent by RACH simultaneously.
In this stage, if the downlink data mailing to UE 20 arrives eNB 10 from epigyny device, then eNB 10 generates independent signature by signature management department 15, sends to UE 20(step S2b by signature assignment messages (random access guiding distribution) #2-1).
In UE 20, if receive above-mentioned signature assignment messages (random access guiding distribution) #2-1, then can there is above-mentioned stochastic signature and sign separately, producing multiplexing distribution.If UE 20 detects this multiplexing distribution, then select any one to sign identically with the 2nd execution mode with the 1st, continue to perform a kind of Stochastic accessing (Figure 18 shown in have selected situation based on the Stochastic accessing competed) corresponding with selected signature.
In this case, as the 1st execution mode, by the upstream message #1-3 that sends in step S3 after this to double as UL confirmation of synchronization.In addition, as the 2nd execution mode, UL dispatch request can be doubled as by upstream message #1-3, also can double as UL dispatch request by upstream message (random access guiding) #2-2.And then UL dispatch request both sent by the ack/nack signal for response message #2-3, also sent by independent upstream message.
Then, if eNB 10 couples of message #1-3 carry out receiving etc. to recognize effective UE 20, then the one signature under multiplexing distribution state can be discharged.
That is, according to the 1st execution mode and this example, the transmission of issuing signature assignment messages (random access guiding distribution) #2-1 of UE 20 can be regularly any timing before eNB 10 receipt message #1-3.
[6] the 6th execution modes
Figure 19 is the sequence chart that the Stochastic accessing step that sixth embodiment of the present invention relates to is described.This example is to example when sending signature assignment messages (random access guiding distribution) #2-1 by eNB 10 to UE 20 after eNB 10 have sent message (Scheduled Transmission: scheduled transmission) #1-3 by UE 20.
Namely, if create upstream data in UE 20, then random access preamble message (up send request) #1-1 comprising stochastic signature can be sent to eNB 10(step S1a by UE 20), receiving the response message #1-2(step S2 to this message) after, send message #1-3(step S3).
If eNB 10 receives this message #1-3, then start the ID(Termination ID of effective UE 20) check processing.If effective Termination ID detected, then identifiable design goes out the competition creating signature between which UE 20, if competed, contention resolved message (Contention Resolution: contention resolved) #1-4 is sent to corresponding UE 20, thus the solution (step S4) that is at war with.
At this, among the process of this message #1-3, buffer part 13, downlink data is there is because the downlink data mailing to UE 20 arrives eNB 10(from epigyny device) and the reasons such as this reception process cannot be terminated, the above-mentioned message #1-3 that None-identified UE20 sends.
In this case, eNB 10 is generated and stored by signature management department 15 and carries out by the destination UE 20 of above-mentioned downlink data the signature (signing separately: the 2nd information) that Stochastic accessing (UL synchronization request) should use, by signature assignment messages (RA Preamble Assignment: random access guiding distributes) #2-1 by this separately signature send to above destination UE 20(step S3a via receiving and transmitting part 12).
When terminating the transmitting-receiving process of these message #1-3 and message #2-1, eNB 10 can identify " which UE 20 is at which signature of use ".That is, which UE 20 released two signatures (RandomPreamble and Dedicated Preamble: leading and Special leader at random) can be identified.
At this, when at UE 20 and other UE(hereinafter referred to as other UE) between do not compete, can be judged to create multiplexing distribution to UE 20, therefore eNB 10(signature management department 15) discharge the independent signature distributing to UE 20 immediately, send contention resolved message #1-4(step S4 according to normal conditions).Because this stage normally can guarantee uplink synchronous, the transmission of downlink data therefore can be started.
On the other hand, when competing between UE 20 and other UE, each message #1-3 that likely property sends from UE 20 and other UE clashes.In this case, due at this phase judgement for create multiplexing distribution to UE 20, the independent signature distributing to UE 20 therefore cannot cannot be discharged immediately.When competing, eNB 10 creates the situation of competition in contention resolved message #1-4 to UE 20 notice.Now, preferably before the UE 20 that signature is multiplexing being detected, signature is separately kept.
On the other hand, in UE 20, with whether the Termination ID of our station 20 is notified that giving eNB 10 has nothing to do, in the stage of end transmission message #1-3 and signature assignment messages #2-1, can identify that (detections) goes out to exist the generation of both stochastic signature (leading at random) and the independent signature (Dedicated Preamble) that distributed by eNB 10, the i.e. above-mentioned two kinds of Stochastic accessing that our station generates.
Now, when each message #1-3 sent from UE 20 and other UE does not produce conflict in eNB 10, UE 20, by referring to the contention resolved message #1-4 notified from eNB 10, can learn and not compete.In this case, UE 20 such as discharges leading separately, by guaranteeing that UL is synchronous based on the Stochastic accessing step of competition.Its reason is: proper reception of UL timing information by message #1-2.
On the other hand, when each message #1-3 sent from UE 20 and other UE produces conflict in eNB 10, UE 20, by referring to the contention resolved message #1-4 notified from eNB 10, can learn and create competition.In this case, UE 20 discharges leading separately, can by guaranteeing UL synchronization request and UL dispatch request based on the Stochastic accessing step of competition simultaneously as the 1st execution mode.In addition, all right as the 2nd to the 4th execution mode, by guaranteeing UL synchronization request and UL dispatch request based on non-competing Stochastic accessing step.
And then, as described in the 1st execution mode, each Stochastic accessing step can be carried out simultaneously.That is, compete if detected, then also can use the independent signature by above-mentioned message #2-1 notice, perform based on non-competing Stochastic accessing simultaneously.
And, in the present embodiment, present embodiment describes the situation that have sent above-mentioned message #2-1 in the process of above-mentioned message #1-3, even if but when sending above-mentioned message #2-1 between above-mentioned message #1-2 and above-mentioned message #1-3, can certainly realize same work.
Applicability in industry
What as above describe in detail is such, according to the present invention, energy selectivity performs any one in multiple Stochastic accessing, in addition, effective utilization of the resources such as the signature used in above-mentioned Stochastic accessing can also be realized, be thus considered to for wireless communication technology field be extremely useful.
Claims (8)
1. the accidental access method in wireless communication system, above-mentioned wireless communication system comprises base station and wireless terminal, and above-mentioned accidental access method comprises the steps:
In above-mentioned wireless terminal,
When carrying out a Stochastic accessing in the 1st Stochastic accessing and the 2nd Stochastic accessing, when the new request of another Stochastic accessing in described 1st Stochastic accessing and described 2nd Stochastic accessing is carried out in the request of receiving, select to be used for the 1st information of described 1st Stochastic accessing or the 2nd information for described 2nd Stochastic accessing, as the information for performing the Stochastic accessing employing described information.
2. accidental access method according to claim 1, wherein,
Above-mentioned 1st information is the 1st random access guiding, and above-mentioned 2nd information is the 2nd random access guiding.
3. accidental access method according to claim 1 and 2, wherein,
Above-mentioned wireless terminal sends the identifier identifying above-mentioned wireless terminal.
4. accidental access method according to claim 1, wherein,
Above-mentioned wireless terminal receives above-mentioned 1st information being used for above-mentioned 1st Stochastic accessing from above-mentioned base station.
5. accidental access method according to claim 1, wherein,
Above-mentioned wireless terminal receives above-mentioned 2nd information being used for above-mentioned 2nd Stochastic accessing from above-mentioned base station.
6. a wireless communication system, this wireless communication system comprises:
Base station; And
The wireless terminal that communicates is carried out with above-mentioned base station,
In above-mentioned wireless terminal,
When carrying out a Stochastic accessing in the 1st Stochastic accessing and the 2nd Stochastic accessing, when the new request of another Stochastic accessing in described 1st Stochastic accessing and described 2nd Stochastic accessing is carried out in the request of receiving, select to be used for the 1st information of described 1st Stochastic accessing or the 2nd information for described 2nd Stochastic accessing, as the information for performing the Stochastic accessing employing described information
In above-mentioned base station,
Data communication is carried out with above-mentioned wireless terminal.
7. a wireless terminal, this wireless terminal comprises selected cell, when carrying out a Stochastic accessing in the 1st Stochastic accessing and the 2nd Stochastic accessing, when the new request of another Stochastic accessing in described 1st Stochastic accessing and described 2nd Stochastic accessing is carried out in the request of receiving, this selected cell is selected to be used for the 1st information of described 1st Stochastic accessing or the 2nd information for described 2nd Stochastic accessing, as the information for performing the Stochastic accessing employing described information.
8. a base station, this base station comprises communication unit, this communication unit and wireless terminal carry out data communication, above-mentioned wireless terminal is when carrying out a Stochastic accessing in the 1st Stochastic accessing and the 2nd Stochastic accessing, when the new request of another Stochastic accessing in described 1st Stochastic accessing and described 2nd Stochastic accessing is carried out in the request of receiving, select to be used for the 1st information of described 1st Stochastic accessing or the 2nd information for described 2nd Stochastic accessing, as the information for performing the Stochastic accessing employing described information.
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