CN101227727B - Method and apparatus for sending accidental access signal in LTE system TDD mode - Google Patents
Method and apparatus for sending accidental access signal in LTE system TDD mode Download PDFInfo
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Abstract
The invention provides a sending method and a device for stochastically accessing signal in a TDD mode of an LTE system, the method comprises the following steps: obtaining maximum permitting value Tud max of switching time from upgoing to downgoing of TDD mode of a LTE system, judging whether Tud max is bigger than a first preset value, and if Tud max is not bigger than the first setting value, and setting a fourth kind structure of RACH to send on a UpPTS ending postion to advance a second preset value, if Tud max is bigger than a first preset value, and setting a fourth kind structure to send on the UpPTS ending position to advance a third preset value. The invention effectively improves coverage scope of a random access channel and work efficiency of a TDD system.
Description
Technical field
The present invention relates to the communications field, the sending method and the device of accidental access signal in a kind of LTE (Long TermEvolution, Long Term Evolution) system TDD (Time Division Duplex, time division duplex) pattern.
Background technology
Fig. 1 shows the frame structure of LTE system TDD mode; In this frame structure; The radio frame (radio frames) of a 10ms is divided into two half frame (field); It is 0.5ms time slot (numbering from 0 to 9) that each field is divided into 10 length, and two time slots are formed the subframe that length is lms.Comprise 5 sub-frame (numbering from 0 to 4) in the field.For length is the short CP (Cyclic Prefix, Cyclic Prefix) of 5.21us and 4.69us, the symbol that it is 66.7us that time slot comprises 7 length, and wherein first symbol CP length is 5.21us, the CP length of all the other 6 symbols is 4.69us; For length is the long CP of 16.67us, and a time slot comprises 6 symbols.In this frame structure, the preparation characteristics of subframe are:
(1) subframe 0 is fixed for descending;
(2) subframe 1 (below be called special subframe) comprises 3 special time slots; Be respectively DwPTS (Downlink Pilot Time Slot, descending pilot frequency time slot), GP (GuardPeriod, protection at interval) UpPTS (Uplink Pilot Time Slot; Uplink pilot time slot), wherein:
1. DwPTS is used for descendingly, and a minimum symbol is used to transmit P-SCH (Primary-Synchronization Channel, primary synchronization channel), and when DwPTS comprised a plurality of symbol, P-SCH was placed on (as shown in Figure 1) on first symbol;
2. GP is a guard time, does not transmit any data; And
3. UpPTS is used for uply, can be used to transmit signals such as RACH (Random AccessChannel, RACH), data, sounding (detection) pilot tone; And
(3) the preceding n sub-frame of subframe 1 back is used for uplink (1≤n≤3), and back 3-n sub-frame is used for downlink transfer.
As shown in Figure 2, RACH is made up of CP and preamble (leading) two parts, and length is respectively Tcp and Tpre.Distance between the end position of preamble end position and UpPTS is Tgt (as shown in Figure 1) in addition, guarantees that preamble does not produce interference to the data of back sub-frame of uplink.Simultaneously, the preamble front adds CP, guarantees that accidental access signal and the multipath thereof of the UE (subscriber equipment) at cell boarder place also falls in the search window of receiver.
Fig. 3 shows the 4th class formation sketch map of the RACH that only is used for the LTE system TDD mode.Agreement is stipulated at present; (4 of format are used in the tdd mode of LTE the 4th class formation of RACH; Format 0,1,2,3 both can be used in FDD (FrequenceDivision Duplex; FDD) also can be used in the tdd mode) the long 448Ts of Tcp (Ts=1/30.72us), the long 4096Ts of Tpre, the long 288Ts of Tgt.And sending the position is the moment transmission that shifts to an earlier date 4832Ts at the UpPTS end position.
In realizing process of the present invention; The inventor finds because the LTE tdd mode produces and is up to descending change-over time through sending sub-frame of uplink in advance; The lead of supposing sub-frame of uplink be Tud=max (Tud_nb, Tud_ue), wherein Tud_nb is the base station from the up change-over time that receives descending sender's experience; Tud_ue is that mobile phone sends to the time that descending reception is experienced from up; If then Tud is greater than Tgt (288Ts), the sub-frame of uplink that is then shifted to an earlier date will fall in the search window of RACH, will produce interference to RACH.
Summary of the invention
The present invention aims to provide the sending method and the system of accidental access signal in a kind of LTE system TDD mode, to solve the sub-frame of uplink that is shifted to an earlier date in the above-mentioned prior art the improper problem of disturbing that RACH is produced is set.
In an embodiment of the present invention, the sending method of accidental access signal in a kind of LTE system TDD mode is provided, has may further comprise the steps: the maximum of obtaining the down conversion time that is up to of LTE system TDD mode allows value Tud_max; Judge that whether Tud is greater than first predetermined value; And if Tud_max is not more than first predetermined value, the 4th class formation that RACH then is set sends at the second predetermined value place at the UpPTS end position in advance; If Tud_max, then is provided with the 4th class formation greater than first predetermined value and sends at the 3rd predetermined value place in advance at the UpPTS end position.
Preferably, first predetermined value is 288Ts, wherein, and Ts=1/30.72us.
Preferably, second predetermined value is 4832Ts.
Preferably, the 3rd predetermined value is D+4832Ts, wherein D=Tud-288Ts.
Preferably; Tud_max=max (Tud_nb_max; Tud_ue_max); Wherein to be the base station that allowed of LTE system TDD mode finish to begin the maximum duration that experienced to descending transmission from up reception Tud_nb_max, and to be the mobile phone that allowed of LTE system TDD mode finish to begin the maximum duration that experienced to descending reception from up transmission Tud_ue_max.
In an embodiment of the present invention, the dispensing device of accidental access signal in a kind of LTE system TDD mode is provided also, has comprised: acquisition module, the maximum that is used to obtain the down conversion time that is up to of LTE system TDD pattern allows value Tud_max; Judge module is used to judge that whether Tud_max is greater than first predetermined value; And module is set, and being not more than first predetermined value if be used for Tud_max, the 4th class formation that RACH then is set sends at the second predetermined value place at the UpPTS end position in advance; If Tud_max, then is provided with the 4th class formation greater than first predetermined value and sends at the 3rd predetermined value place in advance at the UpPTS end position.
Preferably, first predetermined value is 288Ts, wherein, and Ts=1/30.72us.
Preferably, second predetermined value is 4832Ts.
Preferably, the 3rd predetermined value is D+4832Ts, D=Tud_max-288Ts wherein, the value that Tud_max allows for the maximum that is up to descending change-over time of preset LTE system TDD mode.
Preferably; Tud_max=max (Tud_nb_max; Tud_ue_max); Wherein to be the base station that allowed of LTE system TDD mode finish to begin the maximum duration that experienced to descending transmission from up reception Tud_nb_max, and to be the mobile phone that allowed of LTE system TDD mode finish to begin the maximum duration that experienced to descending reception from up transmission Tud_ue_max.
The sending method of accidental access signal and system in the LTE system TDD mode that embodiments of the invention provide are because considering to reserve under the uplink and downlink timeslot conversion reservation amount; Adopt and to judge that Tud is whether greater than the method for predetermined value; Be provided with and improper RACH produced the problem of disturbing so overcome in the above-mentioned prior art sub-frame of uplink that is shifted to an earlier date, and then reached the coverage that improves RACH effectively and the effect of TDD system works efficient.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 shows the frame structure of LTE system TDD mode;
Fig. 2 shows the RACH structural representation;
Fig. 3 shows the 4th class formation sketch map of the RACH that only is used for the LTE system TDD mode;
Fig. 4 shows the flow chart according to the sending method of accidental access signal in the LTE system TDD mode of the embodiment of the invention;
Fig. 5 shows the block diagram according to the dispensing device of accidental access signal in the LTE system TDD mode of the embodiment of the invention.
Embodiment
Below with reference to accompanying drawing and combine embodiment, specify the present invention.
In order to solve the problems of the technologies described above; The invention provides the sending method of accidental access signal in a kind of wireless communication system; Fig. 4 shows the flow chart according to the sending method of accidental access signal in the LTE system TDD mode of the embodiment of the invention, may further comprise the steps:
Step S10 obtains the maximum that is up to the down conversion time of LTE system TDD mode and fills value Tud_max perhaps;
Step S20 judges that whether Tud_max is greater than first predetermined value; And
Step S30, if Tud_max is not more than first predetermined value, the 4th class formation that RACH then is set sends at the second predetermined value place at the UpPTS end position in advance; If Tud_max, then is provided with the 4th class formation greater than first predetermined value and sends at the 3rd predetermined value place in advance at the UpPTS end position.
The sending method of accidental access signal and system in the LTE system TDD mode that embodiments of the invention provide because adopt judges that Tud_max is whether greater than the method for predetermined value; So overcome the sub-frame of uplink that is shifted to an earlier date in the above-mentioned prior art the improper problem that generation is disturbed to RACH is set, and then has reached jamproof effect RACH.
Preferably, the sending method of accidental access signal comprises in the LTE system TDD mode that provides of embodiments of the invention: first predetermined value is 288Ts; Second predetermined value is 4832Ts; The 3rd predetermined value is D+4832Ts, wherein D=Tud_max-288Ts.
Preferably; Tud_max=max (Tud_nb_max; Tud_ue_max); Wherein to be the base station that allowed of LTE system TDD mode finish to begin the maximum duration that experienced to descending transmission from up reception Tud_nb_max, and to be the mobile phone that allowed of LTE system TDD mode finish to begin the maximum duration that experienced to descending reception from up transmission Tud_ue_max.The span of Tud_max can be 215Ts～2560Ts.
Fig. 5 shows the block diagram according to the dispensing device of accidental access signal in the LTE system TDD mode of the embodiment of the invention, comprising:
Acquisition module, the maximum that is up to the down conversion time that is used to obtain the LTE system TDD mode is filled value Tud_max perhaps;
Judge module is used to judge that whether Tud_max is greater than first predetermined value; And
Module is set, is not more than said first predetermined value if be used for Tud_max, the 4th class formation that RACH then is set sends at the second predetermined value place at the UpPTS end position in advance; If Tud_max, then is provided with the 4th class formation greater than first predetermined value and sends at the 3rd predetermined value place in advance at the UpPTS end position.
The sending method of accidental access signal and system in the LTE system TDD mode that embodiments of the invention provide because adopt judges that Tud_max is whether greater than the method for predetermined value; So overcome the sub-frame of uplink that is shifted to an earlier date in the above-mentioned prior art the improper problem that generation is disturbed to RACH is set, and then has reached jamproof effect RACH.
Preferably, the dispensing device of accidental access signal comprises in the LTE system TDD mode that provides of embodiments of the invention: first predetermined value is 288Ts; Second predetermined value is 4832Ts; The 3rd predetermined value is D+4832Ts, and D=Tud_max-288Ts wherein, Tud_max fill the value of being permitted for the maximum that is up to descending change-over time of preset LTE system TDD mode.
Preferably; Tud_max=max (Tud_nb_max; Tud_ue_max); Wherein to be the base station that allowed of LTE system TDD mode finish to begin the maximum duration that experienced to descending transmission from up reception Tud_nb_max, and to be the mobile phone that allowed of LTE system TDD mode finish to begin the maximum duration that experienced to descending reception from up transmission Tud_ue_max.The span of Tud_max can be 215Ts～2560Ts.
Enumerate embodiment with regard to the concrete application scenarios of Tud_max below, to promote to understanding of the present invention.
Embodiment one
Suppose that it is Tud_max=250Ts that maximum that the LTE tdd mode is up to descending change-over time is filled the value of being permitted, then the 4th class formation of RACH channel sends in the position that the UpPTS end position shifts to an earlier date 4832Ts.
Embodiment two
Suppose that it is Tud_max=350Ts that maximum that the LTE tdd mode is up to descending change-over time is filled the value of being permitted, then the 4th class formation of RACH channel sends in the position that the UpPTS end position shifts to an earlier date 4832Ts+ (350-288) Ts=4894Ts.
Embodiment three
Suppose that it is Tud_max=338Ts that maximum that the LTE tdd mode is up to descending change-over time is filled the value of being permitted, then the 4th class formation of RACH channel sends in the position that the UpPTS end position shifts to an earlier date 4832Ts+ (338-288) Ts=4882Ts.
Embodiment four
Suppose that it is Tud_max=308Ts that maximum that the LTE tdd mode is up to descending change-over time is filled the value of being permitted, then the 4th class formation of RACH channel sends in the position that the UpPTS end position shifts to an earlier date 4832Ts+ (308-288) Ts=4852Ts.
Embodiment five
Suppose that it is Tud_max=369Ts that maximum that the LTE tdd mode is up to descending change-over time is filled the value of being permitted, then the 4th class formation of RACH channel sends in the position that the UpPTS end position shifts to an earlier date 4832Ts+ (369-288) Ts=4913Ts.
Embodiment six
Suppose that it is Tud_max=400Ts that maximum that the LTE tdd mode is up to descending change-over time is filled the value of being permitted, then the 4th class formation of RACH channel sends in the position that the UpPTS end position shifts to an earlier date 4832Ts+ (400-288) Ts=4944Ts.
Embodiment seven
Suppose that it is Tud_max=431Ts that maximum that the LTE tdd mode is up to descending change-over time is filled the value of being permitted, then the 4th class formation of RACH channel sends in the position that the UpPTS end position shifts to an earlier date 4832Ts+ (431-288) Ts=4975Ts.
Embodiment eight
Suppose that it is Tud_max=461Ts that maximum that the LTE tdd mode is up to descending change-over time is filled the value of being permitted, then the 4th class formation of RACH channel sends in the position that the UpPTS end position shifts to an earlier date 4832Ts+ (461-288) Ts=5005Ts.
Embodiment nine
Suppose that it is Tud_max=492Ts that maximum that the LTE tdd mode is up to descending change-over time is filled the value of being permitted, then the 4th class formation of RACH channel sends in the position that the UpPTS end position shifts to an earlier date 4832Ts+ (492-288) Ts=5036Ts.
Embodiment ten
Suppose that it is Tud_max=523Ts that maximum that the LTE tdd mode is up to descending change-over time is filled the value of being permitted, then the 4th class formation of RACH channel sends in the position that the UpPTS end position shifts to an earlier date 4832Ts+ (523-288) Ts=5067Ts.
Embodiment 11
Suppose that it is Tud_max=553Ts that maximum that the LTE tdd mode is up to descending change-over time is filled the value of being permitted, then the 4th class formation of RACH channel sends in the position that the UpPTS end position shifts to an earlier date 4832Ts+ (553-288) Ts=5097Ts.
Embodiment 12
Suppose that it is Tud_max=584Ts that maximum that the LTE tdd mode is up to descending change-over time is filled the value of being permitted, then the 4th class formation of RACH channel sends in the position that the UpPTS end position shifts to an earlier date 4832Ts+ (584-288) Ts=5128Ts.
Embodiment 13
Suppose that it is Tud_max=615Ts that maximum that the LTE tdd mode is up to descending change-over time is filled the value of being permitted, then the 4th class formation of RACH channel sends in the position that the UpPTS end position shifts to an earlier date 4832Ts+ (615-288) Ts=5159Ts.
Can find out that by above scheme the present invention solves in the TDD system, when reserving ascending-descending subframes and dispose change-over time, the method for sending RACH in the UpPTS.Considering to improve the coverage of RACH effectively on the attainable basis of hardware system, improving TDD system works efficient, and under multi-path environment, also can guarantee higher access success rate at random.
Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the storage device and carry out, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize by calculation element.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. the sending method of accidental access signal in the LTE system TDD mode is characterized in that, may further comprise the steps:
The maximum of obtaining the down conversion time that is up to of said LTE system TDD mode allows value Tud_max;
Judge that whether Tud_max is greater than first predetermined value; And
If Tud_max is not more than said first predetermined value, the 4th class formation that RACH then is set sends at the second predetermined value place at the UpPTS end position in advance; If Tud_max, then is provided with said the 4th class formation greater than said first predetermined value and sends at the 3rd predetermined value place in advance at the UpPTS end position;
Wherein, said first predetermined value is 288Ts, and said second predetermined value is 4832Ts, and said the 3rd predetermined value is D+4832Ts, D=Tud_max-288Ts wherein, Ts=1/30.72us.
2. sending method according to claim 1; It is characterized in that; Tud_max=max (Tud_nb_max; Tud_ue_max), wherein to be the base station that allowed of said LTE system TDD mode finish to begin the maximum duration that experienced to descending transmission from up reception Tud_nb_max, and to be the subscriber equipment that allowed of said LTE system TDD mode finish to begin the maximum duration that experienced to descending reception from up transmission Tud_ue_max.
3. the dispensing device of accidental access signal in the LTE system TDD mode is characterized in that, comprising:
Acquisition module, the maximum that is used to obtain the down conversion time that is up to of said LTE system TDD mode allows value Tud_max;
Judge module is used to judge that whether Tud_max is greater than first predetermined value; And
Module is set, is not more than said first predetermined value if be used for Tud_max, the 4th class formation that RACH then is set sends at the second predetermined value place at the UpPTS end position in advance; If Tud_max, then is provided with said the 4th class formation greater than said first predetermined value and sends at the 3rd predetermined value place in advance at the UpPTS end position;
Wherein, Said first predetermined value is 288Ts; Said second predetermined value is 4832Ts, and said the 3rd predetermined value is D+4832Ts, wherein D=Tud_max-288Ts; Tud_max is the value of the maximum permission that is up to descending change-over time of preset said LTE system TDD mode, Ts=1/30.72us.
4. dispensing device according to claim 3; It is characterized in that; Tud_max=max (Tud_nb_max; Tud_ue_max), wherein to be the base station that allowed of said LTE system TDD mode finish to begin the maximum duration that experienced to descending transmission from up reception Tud_nb_max, and to be the subscriber equipment that allowed of said LTE system TDD mode finish to begin the maximum duration that experienced to descending reception from up transmission Tud_ue_max.
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| CN101267250B (en) * | 2008-04-25 | 2013-03-27 | 中兴通讯股份有限公司 | Sending method and device of random access signals in LTE system TDD mode |
| CN101801096B (en) * | 2009-02-10 | 2013-06-05 | 电信科学技术研究院 | Method, system and equipment of random access |
| CN105101473A (en) * | 2014-05-08 | 2015-11-25 | 华为技术有限公司 | Method for sending guide signal and user equipment |
| CN107205281B (en) | 2016-03-18 | 2020-11-10 | 中兴通讯股份有限公司 | Method for sending random access signal, method and device for notifying resource |
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| CN101043256A (en) * | 2006-03-23 | 2007-09-26 | 大唐移动通信设备有限公司 | User access method for TDD mode |
| CN101102525A (en) * | 2007-08-06 | 2008-01-09 | 中兴通讯股份有限公司 | An uplink and downlink conversion time generation method of LTE class II frame structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101043256A (en) * | 2006-03-23 | 2007-09-26 | 大唐移动通信设备有限公司 | User access method for TDD mode |
| CN101102525A (en) * | 2007-08-06 | 2008-01-09 | 中兴通讯股份有限公司 | An uplink and downlink conversion time generation method of LTE class II frame structure |
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| CMCC et al.Way Forward on LTE TDD Frame Structure.《TSG-RAN WG1 #51》.2007,1-2页. * |
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