CN101594178A - Time division duplex wireless communication device and receiving/transmission method thereof - Google Patents
Time division duplex wireless communication device and receiving/transmission method thereof Download PDFInfo
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Abstract
The present invention relates to wireless communication field, disclose a kind of time division duplex wireless communication device and receiving/transmission method thereof.Among the present invention, transfer point place at receiving slot and sending time slots, by suspending transmitting-receiving to the last time slot of transfer point last or a plurality of OFDM symbols, can strengthen the robustness of TDD equipment at reception-transmission transfer point signal transmitting and receiving, the possibility that the afterbody that reduces receiving slot disturbs the head of the sending time slots that follows closely, thus transmission performance improved on the whole.Can determine guard time at interval from the change-over time that receives transmission according to base station under the variance of TDD system Timing Advance and the tdd mode, and then calculate the value of N, also can set in advance N.
Description
Technical field
The present invention relates to wireless communication field, particularly the communication technology in time division duplex (Time Division Duplex is called for short " the TDD ") system.
Background technology
Time division duplex (Time Division Duplex, be called for short " TDD ") be a kind of communication mode of mobile communication system, this mode receiving and sending messages between base station and subscriber equipment, it is form with the burst sequence, on same carrier frequency, alternately transmit, be that receiving-transmitting sides is sent out in turn and received, or title " ping-pong ".So just can on a carrier frequency, realize a duplex channel, thereby improve the availability of frequency spectrum.
At Long Term Evolution (Long Term Evolution, be called for short " LTE ") adopted the TDD technology in the communication system such as system, wherein timing advance (TA) is used to remedy the loop transmission delay (Round Trip Time is called for short " RTT ") that wireless signal transmits between base station and terminal.Its principle is shown in Fig. 1 (a) to (d).
Fig. 1 (a) is the radio frames form.The short frame format of LTE in the TDD mode is an example, and the radio frames of time domain 5ms is divided into the time slot of 5 1ms, is numbered 0,1,2,3,4 respectively.Wherein 0 time slot is a descending time slot, and 2 time slots are ascending time slots, and what the configuration of 3 time slots and 4 time slots can be for " go up on ", " up and down ", " following " three kinds of configuration modes is a kind of.That selects for use among Fig. 1 (a) is configured to " up and down ", at 3 time slots and 4 time slot intersections individual up-downgoing transfer point is arranged.In addition; 1 time slot is divided into descender (Downlink Pilot Time Slot; abbreviation " DwPTS "), protection interval (Guard Period is called for short " GP "), three parts of ascender (Uplink Pilot Time Slot is called for short " UpPTS ").
In practical communication, wireless signal is sent in the subscriber equipment process of (User Equipment is called for short " UE ") from evolution base station node (evolutional Node B is called for short " eNodeB ") a propagation delay T
P, shown in Fig. 1 (c).In Fig. 1 (c), downstream signal is at time-delay T
PBack arrival UE end, UE inserts signal according to the frame format transmission shown in Fig. 1 (d) of this locality storage, and shifts to an earlier date T under the indication of eNodeB
A, 1Send upward signal.Like this, in the ideal case, the upward signal that UE sends is through T
PTransmission delay after, arrive the position shown in Fig. 1 (b), require consistent with the frame format of Fig. 1 (a).T wherein
A, 1Equal 2 * T
P, i.e. wireless signal propagation time back and forth aloft.
(robust) is relatively poor for the robustness of prior art.Reason has two:
At first, Timing Advance T
A, 1Be to be come out according to the upward signal location estimation that receives by eNodeB, precision is limited; In order to simplify the control signaling complexity of Timing Advance, often adopt 1 bit control signal simultaneously, pass on stepping, step to move back information.Like this, timing position have one partially before or partially after fluctuation range, it is overlapping on time domain with the transmission downstream signal to cause the eNodeB side joint to receive up transmission signal under the situation that fluctuate in the back partially therein, shown in Fig. 2 (b) bend dash area, influence the reception of eNodeB to upward signal afterbody part.
Secondly, adopt reception at eNodeB, send under the situation of time division duplex, in Fig. 3 (b) between #3 time slot and the #4 time slot, eNodeB need be converted to transmit status from accepting state, need reception-transmission interval change-over time (Receive/transmit Transition Gap, be called for short " RTG "), otherwise can influence eNodeB to the reception of upward signal afterbody part or influence eNodeB to the transmission partly of downstream signal head.
Summary of the invention
The object of the present invention is to provide a kind of time division duplex wireless communication device and receiving/transmission method thereof, the possibility that the afterbody that has reduced receiving slot in the TDD equipment disturbs the head of the sending time slots that follows closely.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of method of reseptance of time division duplex wireless communication device, may further comprise the steps:
Whether the next time slot of judging current receiving slot is sending time slots, if then normally receive at the preceding M-N OFDM symbol of this receiving slot, last N OFDM symbol suspends reception, otherwise M OFDM symbol at receiving slot all normally receives, wherein each receiving slot can receive M OFDM symbol, 1≤N＜M.
Embodiments of the present invention also provide a kind of sending method of time division duplex wireless communication device, may further comprise the steps:
Whether the next time slot of judging current sending time slots receiving slot, if, then the preceding M-N OFDM symbol at this sending time slots normally sends, last N OFDM symbol suspends transmission, otherwise M OFDM symbol at sending time slots all normally sends, wherein each sending time slots can send M OFDM symbol, 1≤N＜M.
Embodiments of the present invention also provide a kind of base station, comprising:
Receiving element is used for receiving at receiving slot the OFDM symbol of self terminal, and wherein each receiving slot can receive M OFDM symbol;
Control unit is used to judge whether the next time slot of receiving slot is sending time slots, if then indicate receiving element to suspend reception, wherein 1≤N＜M at last N OFDM symbol of this receiving slot.
Embodiments of the present invention also provide a kind of terminal, comprising:
Transmitting element is used for carrying out at sending time slots the transmission of OFDM symbol, and wherein each sending time slots can send M OFDM symbol;
Control unit is used to judge whether the next time slot of sending time slots is receiving slot, if then indicate transmitting element to suspend transmission, wherein 1≤N＜M at last N OFDM symbol of this sending time slots.
Embodiment of the present invention compared with prior art, the main distinction and effect thereof are:
Transfer point place at receiving slot and sending time slots, by suspending transmitting-receiving to the last time slot of transfer point last or a plurality of OFDM symbols, can strengthen the robustness of TDD equipment at reception-transmission transfer point signal transmitting and receiving, the possibility that the afterbody that reduces receiving slot disturbs the head of the sending time slots that follows closely, thus transmission performance improved on the whole.
Further; determine that from the change-over time that receives transmission guard time at interval according to base station under the variance of TDD system Timing Advance and the tdd mode; and then calculate the value of N; can make the value of N mate the fluctuation situation of timing position under the current channel circumstance well, thereby farthest avoid the interference between the receiving and transmitting signal.
Further, by setting in advance N, can simplify evaluation work, and the interference between the receiving and transmitting signal can be alleviated effectively still to N.
Description of drawings
Fig. 1 be in the existing TDD communication system Timing Advance schematic diagram is set;
Fig. 2 is interference principle figure between the eNodeB transmitting-receiving that causes of existing TDD communication system Timing Advance set point variance;
Fig. 3 is that existing TDD communication system eNodeB receives and dispatches interference principle figure between the transmitting-receiving that change-over time, TRTG brought.
Fig. 4 is the schematic diagram of embodiment of the present invention;
Fig. 5 is the receiving/transmission method schematic flow sheet of TDD Wireless Telecom Equipment in the first embodiment of the invention;
Fig. 6 is the detailed step schematic diagram that eNodeB receives the OFDM symbol in the first embodiment of the invention;
Fig. 7 is the detailed step schematic diagram that UE sends the OFDM symbol in the first embodiment of the invention;
Fig. 8 is the structural representation of eNodeB and UE in the third embodiment of the invention.
Embodiment
In the following description, in order to make the reader understand the application better many ins and outs have been proposed.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on the many variations and the modification of following each execution mode, also can realize each claim of the application technical scheme required for protection.
For making the purpose, technical solutions and advantages of the present invention clearer, embodiments of the present invention are described in further detail below in conjunction with accompanying drawing.
Each following execution mode is that example describes with the eNodeB in the LTE system, be appreciated that, technical scheme of the present invention also can be applied in other communication system outside the LTE, also can be applied in other network equipment outside the eNodeB, can also be applied in the portable terminal, as long as these equipment are based on TDD's.
First execution mode of the present invention relates to the receiving/transmission method of TDD Wireless Telecom Equipment, and its flow process as shown in Figure 5.
In step 501, it is synchronous that UE finishes the sub-district.
After this enter step 502, UE initiates access procedure according to ICQ or local high-level signaling.
After this enter step 503, the eNodeB needed Timing Advance T that estimates to communicate by letter with the UE of access
A, 1
After this enter step 504, eNodeB estimates guard time interval T g.ENodeB is according to position and T at the signal that receiving slot received
A, 1Value can obtain the estimated value of Tg.Specifically, Tg can control T according to eNodeB by eNodeB
A, 1The reception of eNodeB under the variance of precision and the TDD duplex mode-transmission is determined change-over time.
After this enter step 505, eNodeB is according to Tg decision punching symbolic number N.In order to guarantee the negligible degree that interferes with between the eNodeB receiving and transmitting signal, need satisfy N * T
CP+OS〉=Tg, wherein T
CP+OSBe the duration of an OFDM symbol together with its Cyclic Prefix.In an example, use Tg divided by T
CP+OS, the gained result rounded up just can obtain N.By calculating, can make the value of N mate the fluctuation situation of timing position under the current channel circumstance well, thereby farthest avoid the interference between the receiving and transmitting signal N.
After this enter step 506, eNodeB is by the signaling symbolic number N notice UE that will punch.
After this enter step 507, eNodeB and UE communicate.
In the communication steps of eNodeB and UE, the processing substep of eNodeB side as shown in Figure 6:
In step 601, whether the next time slot that eNodeB judges current receiving slot transmission time slot, if, illustrate that then current receiving slot is the transfer point of a reception-transmission afterwards, need particular processing, enter step 603, carry out normal process otherwise enter step 602.
In step 602, eNodeB normally receives M OFDM symbol at this receiving slot, wherein the M OFDM symbolic number that can receive for each receiving slot.After this enter step 601 and handle next receiving slot.
In step 603, eNodeB normally receives at preceding M-N OFDM symbol of this receiving slot, wherein 1≤N＜M.
After this enter step 604, eNodeB suspends reception at last N OFDM symbol of this receiving slot, just this receiving slot is punched.The result who punches at eNodeB side joint time receiving crack # 3 has been shown in Fig. 4 (b).Transfer point place at receiving slot and sending time slots, by suspending transmitting-receiving to the last time slot of transfer point last or a plurality of OFDM symbols, can strengthen the robustness of TDD equipment at reception-transmission transfer point signal transmitting and receiving, the possibility that the afterbody that reduces receiving slot disturbs the head of the sending time slots that follows closely, thus transmission performance improved on the whole.
After this enter step 605, eNodeB normally sends the OFDM symbol at sending time slots after this.
In the communication steps of eNodeB and UE, the processing substep of UE side as shown in Figure 7:
In step 701, whether the next time slot that UE judges current sending time slots transmission time slot, if, illustrate that then current sending time slots is the transfer point of a transmission-reception afterwards, need particular processing, enter step 703, carry out normal process otherwise enter step 702.
In step 702, UE normally sends M OFDM symbol at this sending time slots, wherein the M OFDM symbolic number that can send for each sending time slots.After this enter step 701 and handle next sending time slots.
In step 703, UE normally sends at preceding M-N OFDM symbol of this sending time slots, wherein 1≤N＜M.
After this enter step 704, UE suspends transmission at last N OFDM symbol of this sending time slots.The result who punches at UE side sending time slots # 3 has been shown in Fig. 4 (c).
After this enter step 705, UE normally receives the OFDM symbol at receiving slot after this.
Second embodiment of the invention relates to the receiving/transmission method of TDD Wireless Telecom Equipment, second execution mode and first execution mode are basic identical, difference is that mainly the N of second execution mode is set in advance among the eNodeB, rather than according to actual reception to signal location estimate to obtain.By setting in advance N, can simplify estimation work, and the interference between the receiving and transmitting signal can be alleviated effectively still to N.
Specifically, in second execution mode, step 504 and 505 is omitted.The N of notice UE sets in advance in eNodeB in the step 506.
This N that sets in advance can obtain by the method for emulation and optimization, also can add up and optimization obtains the historical data that this eNode measured in the past.If N is too little, then may all can't eliminate interference at the up-downgoing transfer point in most of frames, thus the whole communication performance of influence.If N is too big, the up-downgoing transfer point in most of frames can not produce interference even without so big N yet, and the frame that is perforated then can be owing to N have reduced the data that can transmit too greatly, so N also can influence whole communication performance too greatly.Thus, can find the optimum N size of coupling emulated data or this eNode historical data through optimization searching with an index of expression overall communication performance as optimization aim.
Method execution mode of the present invention can be realized in software, hardware, firmware or the like mode.No matter the present invention be with software, hardware, or the firmware mode realize, instruction code can be stored in the memory of computer-accessible of any kind (for example permanent or revisable, volatibility or non-volatile, solid-state or non-solid-state, medium fixing or that change or the like).Equally, memory can for example be programmable logic array (Programmable Array Logic, be called for short " PAL "), random access memory (Random Access Memory, be called for short " RAM "), programmable read only memory (Programmable Read Only Memory, be called for short " PROM "), read-only memory (Read-Only Memory, be called for short " ROM "), Electrically Erasable Read Only Memory (Electrically Erasable Programmable ROM, be called for short " EEPROM "), disk, CD, digital versatile disc (Digital Versatile Disc is called for short " DVD ") or the like.
The 3rd execution mode of the present invention relates to an eNodeB and UE, its structure as shown in Figure 8, wherein the eNodeB side comprises:
Receiving element 801 is used for receiving at receiving slot the OFDM symbol of self terminal, and wherein each receiving slot can receive M OFDM symbol.
Punching number computing unit 803 is used for determining the value of N.
Transmitting element 804 is used for sending the OFDM symbol at sending time slots, is used for especially in the present embodiment the value of control unit 802 determined N is sent to terminal.
The UE side comprises:
Receiving element 811 is used at the OFDM symbol of receiving slot reception from eNodeB.
Transmitting element 812 is used for carrying out at sending time slots the transmission of OFDM symbol, and wherein each sending time slots can send M OFDM symbol.
Control unit 813 is used to judge whether the next time slot of sending time slots is receiving slot, sends if then indicate transmitting element to suspend at last N OFDM symbol of this sending time slots, and 1≤N＜M wherein, N is received from eNodeB by receiving element 811 and obtains.
The related equipment of present embodiment can be used for finishing the method flow that first execution mode is mentioned.Therefore all ins and outs of mentioning in the first embodiment are still effective in the present embodiment, in order to reduce repetition, repeat no more here.
The 4th execution mode of the present invention relates to eNodeB and UE.The 4th execution mode and the 3rd execution mode are basic identical, difference mainly is, the N of the eNodeB side of the 4th execution mode is set in advance in the control unit 802, and by eNodeB predefined N is notified to UE, rather than according to actual reception to signal location estimate to obtain.
Specifically, the number computing unit 803 that do not punch of the eNodeB in the 4th execution mode, control unit 802 is according to the reception of predefined N control transmitter unit 801.
The related equipment of present embodiment can be used for finishing the method flow that second execution mode is mentioned.Therefore all ins and outs of mentioning in second execution mode are still effective in the present embodiment, in order to reduce repetition, repeat no more here.
Need to prove, each unit of mentioning in the present device execution mode (the 3rd, the 4th execution mode) all is a logical block, physically, a logical block can be a physical location, it also can be the part of a physical location, can also realize that the physics realization mode of these logical blocks itself is not most important with the combination of a plurality of physical locations, the combination of the function that these logical blocks realized is the key that just solves technical problem proposed by the invention.For example, the control unit 802 in the 3rd execution mode can also be controlled the receiving course of receiving element except the emission that can control transmitter unit; And for example, control unit 802 can be realized in same physical location with punching number computing unit 803 in the 3rd execution mode; Or the like.
In addition, for outstanding innovation part of the present invention, the said equipment execution mode of the present invention (the 3rd, the 4th execution mode) will not introduced not too close unit with solving technical problem relation proposed by the invention, and this does not show that there is not other unit in the said equipment execution mode.For example, the eNodeB in the 3rd execution mode can also have baseband processing unit, antenna or the like.
OFDM symbol alleged in each execution mode of the present invention is a broad sense, both can be the symbol in the multicarrier system, also can be the symbol in the single-carrier system, just belongs to OFDM symbol alleged among the present invention as long as used the basic principle of OFDM.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (10)
1. the method for reseptance of a time division duplex wireless communication device is characterized in that, may further comprise the steps:
Whether the next time slot of judging current receiving slot is sending time slots, if then normally receive at the preceding M-N OFDM symbol of this receiving slot, last N OFDM symbol suspends reception, otherwise M OFDM symbol at receiving slot all normally receives, wherein each receiving slot can receive M OFDM symbol, 1≤N＜M.
2. the method for reseptance of time division duplex wireless communication device according to claim 1 is characterized in that, described equipment is the base station, and self terminal is come at the OFDM symbol that described receiving slot receives in this base station;
Described method is further comprising the steps of:
Before described determining step, the value of described N is determined in described base station, and the value of described N is sent to described terminal.
3. the method for reseptance of time division duplex wireless communication device according to claim 2 is characterized in that, described base station determines that the step of the value of described N comprises following substep:
Guard time is determined at interval according to base station under the variance of tdd systems Timing Advance and the TDD mode from the change-over time that receives transmission in described base station, and wherein said Timing Advance is 2 times that the terminal propagation delay is arrived in the base station;
At interval divided by the duration of an OFDM symbol together with its Cyclic Prefix, the gained result rounded up obtains described N with described guard time.
4. the method for reseptance of time division duplex wireless communication device according to claim 2 is characterized in that, described N is predefined value.
5. the sending method of a time division duplex wireless communication device is characterized in that, may further comprise the steps:
Whether the next time slot of judging current sending time slots receiving slot, if, then the preceding M-N OFDM symbol at this sending time slots normally sends, last N OFDM symbol suspends transmission, otherwise M OFDM symbol at sending time slots all normally sends, wherein each sending time slots can send M OFDM symbol, 1≤N＜M.
6. the sending method of time division duplex wireless communication device according to claim 5 is characterized in that, described equipment is terminal, and this terminal sends OFDM symbol at described sending time slots to the base station;
Described method is further comprising the steps of:
Before described determining step, the value of described N is determined in described base station, and the value of described N is sent to described terminal.
7. a base station is characterized in that, comprising:
Receiving element is used for receiving at receiving slot the OFDM symbol of self terminal, and wherein each receiving slot can receive M OFDM symbol;
Control unit is used to judge whether the next time slot of described receiving slot is sending time slots, if then indicate described receiving element to suspend reception, wherein 1≤N＜M at last N OFDM symbol of this receiving slot.
8. base station according to claim 7 is characterized in that, described base station also comprises:
Punching number computing unit is used for determining the value of described N;
Transmitting element is used for the value of the determined N of described control unit is sent to described terminal.
9. base station according to claim 8 is characterized in that, the value that computing unit is determined described N is in the following manner counted in described punching:
Determine guard time at interval according to base station under the variance of tdd systems Timing Advance and the TDD mode from the change-over time that receives transmission, wherein said Timing Advance is 2 times that the terminal propagation delay is arrived in the base station;
At interval divided by the duration of an OFDM symbol together with its Cyclic Prefix, the gained result rounded up obtains described N with described guard time.
10. a terminal is characterized in that, comprising:
Transmitting element is used for carrying out at sending time slots the transmission of OFDM symbol, and wherein each sending time slots can send M OFDM symbol;
Control unit is used to judge whether the next time slot of described sending time slots is receiving slot, if then indicate described transmitting element to suspend transmission, wherein 1≤N＜M at last N OFDM symbol of this sending time slots.
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| CN 200810043433 CN101594178B (en) | 2008-05-30 | 2008-05-30 | Time division duplex wireless communication equipment and receiving and transmitting method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485998A (en) * | 2014-12-15 | 2015-04-01 | 北京理工大学 | Calibration device and method for response time of optical communication transmitting-receiving component |
| CN107124384A (en) * | 2016-02-25 | 2017-09-01 | 中国移动通信集团公司 | Method, device and base station that a kind of protection interval is set |
| CN107294670A (en) * | 2016-03-30 | 2017-10-24 | 联芯科技有限公司 | point-to-point communication method and system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5515366A (en) * | 1994-11-17 | 1996-05-07 | International Business Machines Corporation | Method and apparatus for direct communication in a TDMA radio communication system |
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2008
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485998A (en) * | 2014-12-15 | 2015-04-01 | 北京理工大学 | Calibration device and method for response time of optical communication transmitting-receiving component |
| CN107124384A (en) * | 2016-02-25 | 2017-09-01 | 中国移动通信集团公司 | Method, device and base station that a kind of protection interval is set |
| CN107124384B (en) * | 2016-02-25 | 2019-10-01 | 中国移动通信集团公司 | A kind of method, apparatus of protection interval setting and base station |
| CN107294670A (en) * | 2016-03-30 | 2017-10-24 | 联芯科技有限公司 | point-to-point communication method and system |
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Application publication date: 20091202 Assignee: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Assignor: Xin Xin finance leasing (Beijing) Co.,Ltd. Contract record no.: 2018990000163 Denomination of invention: Time division duplex wireless communication equipment and receiving and transmitting method thereof Granted publication date: 20130327 License type: Exclusive License Record date: 20180626 |
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Assignee: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Assignor: Xin Xin finance leasing (Beijing) Co.,Ltd. Contract record no.: 2018990000163 Date of cancellation: 20210301 |
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Application publication date: 20091202 Assignee: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Assignor: Xinxin Finance Leasing (Xiamen) Co.,Ltd. Contract record no.: X2021110000010 Denomination of invention: Time division duplex wireless communication equipment and its transmitting and receiving method Granted publication date: 20130327 License type: Exclusive License Record date: 20210317 |
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Effective date of registration: 20230713 Address after: 201203 Shanghai city Zuchongzhi road Pudong New Area Zhangjiang hi tech park, Spreadtrum Center Building 1, Lane 2288 Patentee after: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Address before: 361012 unit 05, 8 / F, building D, Xiamen international shipping center, 97 Xiangyu Road, Xiamen area, China (Fujian) pilot Free Trade Zone, Xiamen City, Fujian Province Patentee before: Xinxin Finance Leasing (Xiamen) Co.,Ltd. |