CN101583186B - Uplink pre-synchronization method - Google Patents
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- CN101583186B CN101583186B CN2008101118715A CN200810111871A CN101583186B CN 101583186 B CN101583186 B CN 101583186B CN 2008101118715 A CN2008101118715 A CN 2008101118715A CN 200810111871 A CN200810111871 A CN 200810111871A CN 101583186 B CN101583186 B CN 101583186B
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Abstract
The invention discloses an uplink pre-synchronization method, which comprises the following steps: firstly, setting a random access timer for each user equipment (UE) in a base station (Node B), and when downlink data of the Node B needs to be sent to the UE, performing the following operations: judging whether the random access timer corresponding to the UE exceeds the time or not; if the randomaccess timer does not exceed the time, directly starting sending the downlink data, otherwise, sending an uplink synchronously established instruction to the UE, and judging whether to receive a random access signal from the UE in the expected time; and when the random access signal is received, sending the downlink data to the UE and resetting the random access timer corresponding to the UE. By applying the method, unnecessary uplink synchronous attempt at UE side can be effectively reduced, and system performances are improved.
Description
Technical field
The present invention relates to mobile communication technology, particularly a kind of uplink pre-synchronization method.
Background technology
Insert in (UMTS TDD HSPA) evolution subsystem in universal mobile telecommunications system time division multiplexing high-speed packet, subscriber equipment (UE) has two kinds of basic operational modes: idle pulley and connection mode.After the UE start powers on, enter idle pulley; UE under the idle pulley receives the paging of system or receives the upper strata request when setting up RRC and connecting, and finishes RRC and connects and set up, and transfer to connection mode from idle pulley; When RRC connected release, UE transferred to idle pulley from connection mode.
Under connection mode, UE has four kinds of states: CELL_FACH state, CELL_DCH state, CELL_PCH state and URA_PCH state.Different states has reflected that the connection rank of UE and UE can use any transmission channel, is satisfying under the situation of certain condition, and UE can change between described four kinds of states.Wherein, under the CELL_FACH state, UE does not have dedicated channel, uses common signal channel to transmit signaling message and a spot of user data between UE and base station (Node B).
The common signal channel that the application is related to carries out brief description below:
High-Speed Shared Control Channel (HS-SCCH) is a down control channel, is used for bear control information and order etc., and wherein, control information is used for following the data on the Traffic Channel to carry out demodulation to it;
High-speed physical downlink shared channel (HS-PDSCH) (HS-PDSC) is a downlink traffic channel, is used to carry data, and these data can follow the control information on the control channel to carry out demodulation according to it;
Physical access channel (FPACH) is a down control channel, and Node B uses FPACH to respond the access request of UE, and adjusts transmitting power and the simultaneous bias of UE;
High-speed shared information channel (HS-SICH) is an ascending control channel, is used to feed back relevant uplink information, mainly comprises: response message (ACK), non-response message (NACK) and channel quality indication (CQI);
Enhanced uplink random access channel (E-RUCCH) is an ascending control channel, is mainly used in the up professional access request that strengthens.
Because what transmit on the common signal channel is data between Node B and the some UE, in order to guarantee the correct reception of data, must take certain synchronization policy to carry out synchronously.At present, industry has been reached extensive common recognition: under the CELL_FACH state, there is no need to require UE to remain uplink synchronous, therefore, before the UE that is in the CELL_FACH state sends upward signal, must initiate a random access procedure earlier and obtain uplink synchronous.
Random access procedure is specially: UE goes up at uplink pilot time slot (UpPTS) and sends uplink synchronous code (SYNC-UL), after Node B detects the SYNC-UL of UE transmission, send ACK by FPACH, after UE receives the FPACH ACK of Node B, initiate the E-RUCCH random access procedure.
Consider between HS-PDSCH and the HS-SICH to have strict timing relationship, that is: Node B on the HS-PDSCH after certain UE sends downlink data, need in the time of expectation, receive the feedback that this UE sends on HS-SICH; And UE must could send feedback message on HS-SICH after obtaining uplink synchronous, as seen, if carry out uplink synchronous after the downlink data of UE on receiving HS-PDSCH again, the time that then sends the HS-SICH feedback at last will exceed the time that Node B expectation receives, for this reason, industry has proposed a kind of method of being carried out up presynchronization by Node B control UE.
Fig. 1 is the schematic diagram of existing uplink pre-synchronization method.Referring to Fig. 1, this method comprises the processing of Node B side and the processing of UE side, respectively shown in Fig. 1 the first half and the latter half.Subframe of each 5 milliseconds (ms) expression shown in the figure; comprise ascending time slot, special time slot (comprising guard time interval and uplink pilot time slot between descending pilot frequency time slot, up-downgoing) and descending time slot in each subframe; the scheduling situation of the descending time slot of each subframe is shown in the first half among Fig. 1, and the scheduling situation of the ascending time slot of each subframe is shown in the latter half among Fig. 1.When existing downlink data, Node B side need when certain UE sends, will trigger following flow process:
The 1st step: at the descending time slot of first 5ms shown in Figure 1, Node B sends the instruction of setting up uplink synchronous by HS-SCCH to this UE.
The 2nd step: UE receives after the above-mentioned instruction, sends SYNC_UL at the UpPTS of second 5ms shown in Figure 1 and carries out the uplink synchronous trial.
The 3rd step: if the SYNC_UL collision does not take place, Node B will at the descending time slot of second 5ms shown in Figure 1, send ACK message by FPACH after receiving the SYNC_UL that UE sends.
The 4th step:, then, initiate to insert at random by E-RUCCH at the ascending time slot of the 3rd 5ms shown in Figure 1 if UE receives the ACK on the FPACH; If the SYNC_UL collision has taken place, UE will can not receive the ACK on the FPACH, and in this case, UE will until the ACK that receives on the FPACH, could initiate E-RUCCH and insert at random postponing to resend SYNC_UL behind the certain hour.
The 5th step: at the descending time slot of the 4th 5ms shown in Figure 1, Node B at first sends by HS-SCCH and is used for demodulation it follows the control information etc. of HS-PDSCH, sends downlink data by HS-PDSCH then; At the 5th 5ms shown in Figure 1, Node B continues to send downlink data by HS-PDSCH, finishes until transmission.
The 6th step: correct at the 6th 5ms shown in Figure 1 if UE receives data check, then send ACK message to Node B by HS-SICH, if UE receives the data check failure, then send NACK message to Node B by HS-SICH.
So far, finish existing uplink pre-synchronization method.
Though above-mentioned existing uplink pre-synchronization method can make which UE of Node B identification finish uplink synchronous, but, the uplink synchronous that this method does not take any measure to reduce UE is attempted, (enhancement mode CELL_FACH is the scheme that the HSPA+ system introduces on the CELL_FACH basis if this uplink pre-synchronization method is applied to enhancement mode CELL_FACH, be intended to support a large amount of simultaneously online data service users), then cause the higher SYNC_UL collision probability of eating dishes without rice or wine probably, thereby cause the reduction of systematic function.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of uplink pre-synchronization method, attempts to reduce UE side unnecessary uplink synchronous.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of uplink pre-synchronization method in base station node B, is provided with one corresponding to each user terminal UE and inserts timer at random, and carries out starting the described timer that inserts at random after a uplink synchronous at UE; Insert at random after timer starts when described, when Node B existed downlink data to send to UE, this method comprised:
A, judge whether overtimely,, then continue execution in step B if not overtime corresponding to the timer of access at random of described UE, otherwise, execution in step C continued;
B, directly begin to send described downlink data, method ends;
C, send the instruction that uplink synchronous is set up, and judge whether in the time of expectation, to receive the accidental access signal that comes from UE, if receive, then send described downlink data, and reset corresponding to the timer of access at random of described UE to UE to UE.
In the such scheme, may further include among the described step C: if Node B does not receive the accidental access signal that comes from UE in the time of expectation, then send the instruction that uplink synchronous is set up to UE again, until receiving the accidental access signal that comes from UE.
Judge not overtime in steps A corresponding to the timer of access at random of described UE, continue before the execution in step B, may further include: whether the position of judging the upward signal that described UE is up-to-date is near default up detection window border, if, then continue execution in step C, otherwise, continue execution in step B.
This method may further include: if Node B has sent an instruction that uplink synchronous is adjusted to UE, then reset corresponding to the timer of access at random of described UE.
The described timing length that inserts timer at random can be by radio network controller when described Node B corresponding district be set up or increase enhancement mode CELL_FACH function, and described Node B is given in configuration.
Described instruction of setting up to UE transmission uplink synchronous can comprise: send the instruction that uplink synchronous is set up by high-speed shared control channel HS-SCCH to UE.
This method may further include: increase the instruction that is used to represent uplink synchronous foundation in advance in the order of HS-SCCH.
Described increase is used to represent that the instruction that uplink synchronous is set up can comprise: being complete 0 order with HS-SCCH channel upper signal channel sign indicating number collection information field value is used to the instruction of representing that uplink synchronous is set up as described.
Described accidental access signal can be sent by enhanced uplink random access channel E-RUCCH by UE.
As seen from the above technical solution, uplink pre-synchronization method of the present invention, by in Node B, inserting timer at random for each UE is provided with one, and when Node B exists downlink data to send to UE, whether overtimely at first judge corresponding to the timer of access at random of described UE, if it is not overtime, then can directly begin to send downlink data corresponding to this UE, so, made full use of existing joint detection receiver technology and can tolerate that locus under the certain time length moves the characteristic of time corresponding skew, reduce the trial of UE side unnecessary uplink synchronous effectively, thereby improved the performance of system.
In order when reducing the unnecessary uplink synchronous trial, to guarantee that systematic function is unaffected, the present invention has introduced the up presynchronization scheme of carrying out dual judgement, that is: after the timer of access at random of judging this UE is not overtime, whether the position of further judging the upward signal that this UE is up-to-date is near default up detection window border, if do not have, show that then the current present position of UE need not to carry out uplink synchronous and upgrades, can directly begin to send downlink data corresponding to this UE, so, guaranteeing under the impregnable prerequisite of systematic function, reaching and reduced the purpose that uplink synchronous is attempted.
Description of drawings
Fig. 1 is the schematic diagram of existing uplink pre-synchronization method;
Fig. 2 is the principle schematic of uplink pre-synchronization method of the present invention;
Fig. 3 is the schematic flow sheet of uplink pre-synchronization method in the embodiment of the invention one;
Fig. 4 is the schematic flow sheet of uplink pre-synchronization method in the embodiment of the invention two.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
Existing joint detection receiver technology can tolerate that certain time length (can reach second level) locus down moves the time corresponding skew, therefore, need not to carry out once more the uplink synchronous renewal in the time window of finishing a certain-length after the uplink synchronous.For example, even consider the situation of high-speed mobile, as 120km/h, if the letter length of putting that uplink synchronous need not to upgrade is 100ms, then corresponding maximum time skew is 1us, is about the length of 1 chip, and this skew does not have influence substantially to receiver performance.
Uplink pre-synchronization method of the present invention utilizes above-mentioned characteristic just, on the basis of existing uplink pre-synchronization method, introduce timer mechanism, that is: after carrying out uplink synchronous, certain UE starts the timer of access at random of this UE correspondence, and when existing downlink data to send to described UE, according to judging corresponding to the timer of access at random of this UE is whether overtime whether needs carry out up presynchronization, thereby realize reducing the purpose that UE side unnecessary uplink synchronous is attempted.
Fig. 2 is the principle schematic of uplink pre-synchronization method of the present invention.Referring to Fig. 2, the expression mode of this figure and Fig. 1 is similar, comprises the processing of Node B side and the processing of UE side, respectively shown in Fig. 2 the first half and the latter half.Than Fig. 1, Fig. 2 simplifies the expression of subframe, for example: for the processing of Node B side, only show descending time slot, and not shown whole subframe similarly, for the processing of UE side, also only shows ascending time slot, not shown whole subframe.The principle of uplink pre-synchronization method of the present invention shown in Figure 2 is:
Sent after instruction, UE that uplink synchronous sets up carried out that uplink synchronous is attempted and insert at random to UE at Node B, before the timer expiry of access at random corresponding to this UE, UE need not to carry out once more uplink synchronous and upgrades, during this period of time, when there is downlink data in Node B need be when this UE sends, directly transmission gets final product.
In addition, on the basis of above-mentioned timer mechanism, the invention allows for a kind of detection window mechanism, that is: whether judge near default up detection window border whether UE needs to carry out up presynchronization by the position of judging the upward signal that described UE is up-to-date, this scheme can guarantee under the impregnable prerequisite of systematic function, reduce uplink synchronous and attempt.
The present invention is described in detail below by two embodiment.
Embodiment one:
Only judge by timer mechanism whether UE needs to carry out up presynchronization in the present embodiment.
Fig. 3 is the schematic flow sheet of uplink pre-synchronization method in the embodiment of the invention one.Referring to Fig. 3, this method comprises:
Step 301: in Node B, be provided with one corresponding to each UE and insert timer at random.
In this step, the described timing length that inserts timer at random can be by radio network controller (RNC) when described Node B corresponding district be set up or increase enhancement mode CELL_FACH function, and described Node B is given in configuration.
Step 302: judge whether to exist downlink data need send to UE, if, then continue execution in step 303, otherwise, the method ends flow process.
Step 303: judge whether overtimely,, then continue execution in step 307 if not overtime corresponding to the timer of access at random of this UE, otherwise, continue execution in step 304.
In this step,, show that then the last uplink synchronous that obtains of UE remains valid, and need not to carry out uplink synchronous and upgrades if it is not overtime to insert timer at random.
Step 304: send the instruction that uplink synchronous is set up to UE.
In this step, can send the instruction that uplink synchronous is set up to UE, particularly, can realize by the mode that in the order of HS-SCCH, increases the instruction that is used to represent that uplink synchronous is set up in advance by HS-SCCH.
The existing control information that is mapped on the HS-SCCH comprises following information bit:
1) channel code collection information (Channelisation-code-set information), 7bit is expressed as: X
Ccs, 1, X
Ccs, 2..., X
Ccs, 8
2) gap information (Time slot information), 5bit is expressed as respectively: X
Ts, 1, X
Ts, 2..., X
Ts, 5
3) modulation scheme information (Modulation scheme information), 1bit is expressed as: X
Ms, 1
4) transport block size information (Transport-block size infformation) 6bit is expressed as: X
Tbs, 1, X
Tbs, 2..., X
Tbs, 6
5) rapid mixing automatic repeat request (HARQ) information (Hybrid-ARQ process information), 3bit is expressed as: X
Hap, 1, X
Hap, 2, X
Hap, 3
6) redundant and constellation version information (Redundancy and constellation version), 3bit is expressed as: X
Rv, 1, X
Rv, 2, X
Rv, 3
7) new-data flag (New data indicator), 1bit is expressed as: X
Nd, 1
8) HS-SCCH cyclic sequence number (HS-SCCH cyclic sequence number), 3bit is expressed as: X
Hcsn, 1, X
Hcsn, 2, X
Hcsn, 3
9) UE sign (UE identify), 16bit is expressed as: X
Ue, 1, X
Ue, 2..., X
Ue, 16
The present invention advises using channel code collection information field value, and to be complete 0 order be used to the instruction of representing that uplink synchronous is set up as of the present invention.Certainly, in actual applications, other different values that can adopt other fields are used to the instruction of representing that uplink synchronous is set up as of the present invention, only otherwise get final product with existing command collision.
Step 305: judge whether in the time of expectation, to receive the accidental access signal that comes from UE,, then continue execution in step 306 if receive, otherwise, continue execution in step 304.
According to the described existing uplink pre-synchronization method of background technology, after UE receives the instruction of setting up uplink synchronous of Node B by the HS-SCCH transmission, to send SYNC_UL at the UpPTS of next subframe and carry out the uplink synchronous trial, and after receiving the ACK message that Node B sends by FPACH, initiate to insert at random by E-RUCCH, therefore, if SYNC_UL does not take place, Node B will receive the accidental access signal that comes from UE in the time of expectation, at this moment, it is the same to have uplink pre-synchronization method as stated in the Background Art now, begins to send downlink data, continues execution in step 306 that is:.But,, at this moment, should return step 304, again the instruction of setting up to uplink synchronous if NodeB, then shows the access failure at random of UE less than do not receive the accidental access signal that comes from UE in the time of expectation.
Step 306: send downlink data to UE, and reset corresponding to the timer of access at random of described UE, method ends flow process.
Because this operation makes UE carry out uplink synchronous one time, therefore, in this step, should reset corresponding to the timer of access at random of described UE.
Step 307: directly send downlink data to UE.
So far, finish uplink pre-synchronization method flow process of the present invention.
Based on the above method, if Node B has sent an instruction that uplink synchronous is adjusted to UE, then according to prior art, UE will carry out the uplink synchronous adjustment, at this moment, need the at random access timer of replacement corresponding to described UE.
As seen from the above-described embodiment, uplink pre-synchronization method of the present invention, by in Node B, inserting timer at random for each UE is provided with one, and when Node B exists downlink data to send to UE, whether overtimely at first judge corresponding to the timer of access at random of described UE, if it is not overtime, then can directly begin to send downlink data corresponding to this UE, so, made full use of existing joint detection receiver technology and can tolerate that locus under the certain time length moves the characteristic of time corresponding skew, reduce the trial of UE side unnecessary uplink synchronous effectively, thereby improved the performance of system.
Embodiment two:
In the present embodiment timer mechanism is combined with detection window mechanism, judge whether UE needs to carry out up presynchronization.
Fig. 4 is the schematic flow sheet of uplink pre-synchronization method in the embodiment of the invention two.Referring to Fig. 4, this method comprises:
Step 401: in Node B, be provided with one corresponding to each UE and insert timer at random.
Step 402: judge whether to exist downlink data need send to UE, if, then continue execution in step 403, otherwise, the method ends flow process.
Step 403: judge whether overtimely,, then continue execution in step 404 if not overtime corresponding to the timer of access at random of this UE, otherwise, continue execution in step 405.
In this step,, show that then the last uplink synchronous that obtains of UE is effective, need to carry out once new uplink synchronous, that is: need carry out uplink synchronous and upgrade if it is overtime to insert timer at random; Otherwise, need be determined further, determined whether to carry out uplink synchronous and upgraded.
Step 404: whether the position of judging the upward signal that described UE is up-to-date near default up detection window border, if, continue execution in step 405, otherwise, execution in step 408 continued.
In this step since at Node B after UE sends downstream signal, need in the time of expectation, receive the upward signal feedback of UE, it is exactly up detection window that the time of described expectation is embodied on the time slot.If the position of the upward signal that UE is up-to-date is near default up detection window border, then the next upward signal of UE will exceed up detection window border probably, it is invalid that the signal that exceeds up detection window border will be considered as, therefore, even this moment, the timer of access at random of this UE was not overtime, still need to carry out uplink synchronous and upgrade, to guarantee the correct reception of data.
Step 405: send the instruction that uplink synchronous is set up to UE.
Can send the instruction that uplink synchronous is set up by HS-SCCH to UE according to the mode identical in this step, not repeat them here with step 304.
Step 406: judge whether in the time of expectation, to receive the accidental access signal that comes from UE,, then continue execution in step 407 if receive, otherwise, continue execution in step 405.
Step 407: send downlink data to UE, and reset corresponding to the timer of access at random of described UE, method ends flow process.
Step 408: directly send downlink data to UE.
So far, finish uplink pre-synchronization method flow process of the present invention.
As seen from the above-described embodiment, the present invention is in order to guarantee that systematic function is unaffected when reducing the unnecessary uplink synchronous trial, the present invention has introduced the up presynchronization scheme of carrying out dual judgement, that is: after the timer of access at random of judging this UE is not overtime, whether the position of further judging the upward signal that this UE is up-to-date is near default up detection window border, if do not have, show that then the current present position of UE need not to carry out uplink synchronous and upgrades, can directly begin to send downlink data corresponding to this UE, so, guaranteeing under the impregnable prerequisite of systematic function, reaching and reduced the purpose that uplink synchronous is attempted.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. uplink pre-synchronization method is characterized in that:
In base station node B, be provided with one corresponding to each user terminal UE and insert timer at random, and carried out starting the described timer that inserts at random after a uplink synchronous at UE; Insert at random after timer starts when described, when Node B existed downlink data to send to UE, this method comprised:
A, judge whether overtimely,, then continue execution in step B if not overtime corresponding to the timer of access at random of described UE, otherwise, execution in step C continued;
B, directly begin to send described downlink data, method ends;
C, send the instruction that uplink synchronous is set up, and judge whether in the time of expectation, to receive the accidental access signal that comes from UE, if receive, then send described downlink data, and reset corresponding to the timer of access at random of described UE to UE to UE.
2. method according to claim 1 is characterized in that, further comprises among the described step C:
If Node B does not receive the accidental access signal that comes from UE in the time of expectation, then send the instruction that uplink synchronous is set up to UE again, until receiving the accidental access signal that comes from UE.
3. method according to claim 2 is characterized in that, and is not overtime corresponding to the timer of access at random of described UE in the steps A judgement, continues further to comprise before the execution in step B:
Whether the position of judging the upward signal that described UE is up-to-date near default up detection window border, if, then continue execution in step C, otherwise, execution in step B continued.
4. method according to claim 2 is characterized in that, this method further comprises:
If Node B has sent an instruction that uplink synchronous is adjusted to UE, then reset corresponding to the timer of access at random of described UE.
5. according to each described method of claim 1 to 4, it is characterized in that:
When described Node B corresponding district was set up or increase enhancement mode CELL_FACH function, described Node B was given in configuration to the described timing length that inserts timer at random by radio network controller.
6. according to each described method of claim 1 to 4, it is characterized in that described instruction of setting up to UE transmission uplink synchronous comprises:
Send the instruction that uplink synchronous is set up by high-speed shared control channel HS-SCCH to UE.
7. method according to claim 6 is characterized in that, this method further comprises:
In the order of HS-SCCH, increase the instruction that is used to represent uplink synchronous foundation in advance.
8. method according to claim 7 is characterized in that, described increase is used to represent that the instruction that uplink synchronous is set up comprises:
Being complete 0 order with HS-SCCH channel upper signal channel sign indicating number collection information field value is used to the instruction of representing that uplink synchronous is set up as described.
9. according to each described method of claim 1 to 4, it is characterized in that:
Described accidental access signal is sent by enhanced uplink random access channel E-RUCCH by UE.
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| EP1379033A1 (en) * | 2002-07-01 | 2004-01-07 | Siemens Mobile Communications S.p.A. | Method for releasing single downlink TBFs in a mobile radio system |
| CN101132350A (en) * | 2006-08-22 | 2008-02-27 | 中兴通讯股份有限公司 | Control method for reinforcing uplink random access in time division synchronization code division multiple access system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1379033A1 (en) * | 2002-07-01 | 2004-01-07 | Siemens Mobile Communications S.p.A. | Method for releasing single downlink TBFs in a mobile radio system |
| CN101132350A (en) * | 2006-08-22 | 2008-02-27 | 中兴通讯股份有限公司 | Control method for reinforcing uplink random access in time division synchronization code division multiple access system |
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| 3rd Generation Partnership Project.Technical Specification Group Radio Access Network.《3GPP TS 25.224》.2008,(第8.0.0版), * |
| 3rdGenerationPartnershipProject.TechnicalSpecificationGroupRadioAccessNetwork.《3GPPTS25.224》.2008 (第8.0.0版) |
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