CN101594178B - Time division duplex wireless communication equipment and receiving and transmitting method thereof - Google Patents
Time division duplex wireless communication equipment and receiving and transmitting method thereof Download PDFInfo
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Abstract
The invention belongs to the field of wireless communication and discloses time division duplex wireless communication equipment and a receiving and transmitting method thereof. At a switching point of a receiving time slot and a transmitting time slot, the robustness of TDD equipment when receiving and transmitting receiving-transmitting switching point signals can be enhanced and the interference possibility of the tail part of the receiving time slot to the head part of the subsequent transmitting time slot can be reduced through temporarily stopping receiving and transmitting the last one or a plurality of OFDM symbols of a former time slot of the switching point, thereby improving the transmission performance on the whole. A protection time interval can be determined according to the variance of a timing advance of a TDD system and the receiving-transmitting switching time of a base station in a TDD mode so as to further calculate the value of N, wherein the N can be also preset.
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 the form with the burst sequence, alternately transmit in same carrier frequency, be that receiving-transmitting sides is sent out in turn and received, or title " ping-pong ".So just can realize a duplex channel a carrier frequency, 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.Take the short frame format of LTE of TDD mode as example, the radio frames of time domain 5ms is divided into the time slot of 5 1ms, is numbered respectively 0,1,2,3,4.Wherein 0 time slot is 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 " upper on ", " up and down ", " lower " three kinds of configuration modes is a kind of.That selects 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
PRear arrival UE end, UE sends the access signal according to the frame format 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, 1That by eNodeB according to the upward signal location estimation that receives out precision is limited; In order to simplify the control signal complexity of Timing Advance, often adopt 1 bit control signal simultaneously, pass on stepping, step to move back information.Like this, timing position has the fluctuation range of a partial, can cause the eNodeB side joint to receive up transmitted signal in the situation about fluctuating partially afterwards therein overlapping on time domain with the transmission downstream signal, shown in Fig. 2 (b) bend dash area, affect eNodeB to the reception of upward signal afterbody part.
Secondly, in the situation that adopting, eNodeB receives, sends time division duplex, in Fig. 3 (b) between #3 time slot and the #4 time slot, eNodeB need to be converted to the transmission state from accepting state, reception-transmission interval change-over time (Receive/transmit Transition Gap need to be arranged, be called for short " RTG "), otherwise can affect eNodeB to the reception of upward signal afterbody part or affect eNodeB to the transmission of downstream signal head part.
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 it is the front M-N OFDM symbol at this receiving slot normally receives, 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 front 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, for the OFDM symbol that receives self terminal at receiving slot, wherein each receiving slot can receive M OFDM symbol;
Control unit is used for judging whether the next time slot of receiving slot is sending time slots, if it is indicates 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 the transmission of OFDM symbol at sending time slots, and wherein each sending time slots can send M OFDM symbol;
Control unit is used for judging whether the next time slot of sending time slots is receiving slot, if it is indicates 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 the transmitting-receiving to the last time slot of transfer point last or a plurality of OFDM symbols, can strengthen TDD equipment and receive-sending the robustness of 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 the guard time interval from the change-over time that receives transmission according to base station under the variance of TDD timing lead and the tdd mode; and then calculate the value of N; can make the value of N mate well the fluctuation situation of timing position under the current channel circumstance, thereby farthest avoid the interference between the receiving and transmitting signal.
Further, by setting in advance N, can simplify the evaluation work to N, and the interference between the receiving and transmitting signal can be alleviated effectively still.
Description of drawings
Fig. 1 is the setting principle figure of Timing Advance in the existing TDD communication system;
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 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, below in conjunction with accompanying drawing embodiments of the present invention are described in further detail.
Below the eNodeB of each execution mode in the LTE system describe as example, 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.
The 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, UE finishes cell synchronous.
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 that accesses
A, 1
After this enter step 504, eNodeB estimates guard time interval T g.ENodeB is according to position and the T of the signal that receives at receiving slot
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 determines punching symbolic number N according to Tg.In order to guarantee the negligible degree that interferes with between the eNodeB receiving and transmitting signal, need to satisfy N * T
CP+OS〉=Tg, wherein T
CP+OSThat an OFDM symbol is together with the duration of its Cyclic Prefix.In an example, use Tg divided by T
CP+OS, acquired results rounded up just can obtain N.By the calculating to N, can make the value of N mate well the fluctuation situation of timing position under the current channel circumstance, thereby farthest avoid the interference between the receiving and transmitting signal.
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 special 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 process next receiving slot.
In step 603, eNodeB normally receives at front 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, namely this receiving slot is punched.The result who punches at eNodeB side receiving slot # 3 has been shown in Fig. 4 (b).Transfer point place at receiving slot and sending time slots, by suspending the transmitting-receiving to the last time slot of transfer point last or a plurality of OFDM symbols, can strengthen TDD equipment and receive-sending the robustness of 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 special 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 process next sending time slots.
In step 703, UE normally sends at front 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, the second execution mode and the first execution mode are basic identical, difference mainly is, the N of the second execution mode is set in advance among the eNodeB, rather than estimates to obtain according to the actual signal location that receives.By setting in advance N, can simplify the estimation work to N, and the interference between the receiving and transmitting signal can be alleviated effectively still.
Specifically, in the 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 carry out statistical and optimization to the historical data that this eNode measured in the past and obtain.If N is too little, then may all can't eliminate interference by the up-downgoing transfer point in most of frames, thus the whole communication performance of impact.If N is too large, the up-downgoing transfer point in most of frames can not produce interference even without so large 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 affect too greatly whole communication performance.Thus, can with an index of expression overall communication performance as optimization aim, find the optimum N size of coupling emulated data or this eNode historical data through Optimizing Search.
Method execution mode of the present invention can be realized in software, hardware, firmware etc. mode.No matter the present invention realizes with software, hardware or firmware mode, instruction code can be stored in the memory of computer-accessible of any type (for example permanent or revisable, volatibility or non-volatile, solid-state or non-solid-state, medium fixing or that change etc.).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 ") etc.
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, for the OFDM symbol that receives self terminal at receiving slot, wherein each receiving slot can receive M OFDM symbol.
Control unit 802 is used for judging whether the next time slot of receiving slot is sending time slots, if it is indicates receiving element 801 to suspend reception, wherein 1≤N＜M at last N OFDM symbol of this receiving slot.
Punching number computing unit 803 is for the value of determining 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 the transmission of OFDM symbol at sending time slots, and wherein each sending time slots can send M OFDM symbol.
Control unit 813 is used for judging whether the next time slot of sending time slots is receiving slot, if it is indicates transmitting element to suspend transmission at last N OFDM symbol of this sending time slots, 1≤N＜M wherein, and N is obtained from the eNodeB reception by receiving element 811.
The related equipment of present embodiment can be used for finishing the method flow that the 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 estimates to obtain according to the actual signal location that receives.
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 the second execution mode is mentioned.Therefore all ins and outs of mentioning in the 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 logical block, physically, a logical block can be a physical location, it also can be the part of a physical location, can also realize with the combination of a plurality of physical locations, the physics realization mode of these logical blocks itself is not most important, and the combination of the function that these logical blocks realize 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 the Same Physical unit with punching number computing unit 803 in the 3rd execution mode; Etc..
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 etc.
OFDM symbol alleged in each execution mode of the present invention is 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.
Although 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 it is the front M-N OFDM symbol at this receiving slot normally receives, 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:
Described base station determines from the change-over time that receives transmission that according to base station under the variance of tdd systems Timing Advance and the TDD mode guard time interval, wherein said Timing Advance are 2 times that the terminal propagation delay is arrived in the base station;
Divided by the duration of an OFDM symbol together with its Cyclic Prefix, acquired results rounded up obtains described N with described guard time interval.
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 front 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 time division duplex base station is characterized in that, comprising:
Receiving element, for the OFDM symbol that receives self terminal at receiving slot, wherein each receiving slot can receive M OFDM symbol;
Control unit, be used for judging whether the next time slot of described receiving slot is sending time slots, if it is indicate described receiving element to suspend reception at last N OFDM symbol of this receiving slot, otherwise M OFDM symbol at receiving slot all normally receives, wherein 1≤N＜M.
8. base station according to claim 7 is characterized in that, described base station also comprises:
Punching number computing unit is for the value of determining 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 from the change-over time that receives transmission that according to base station under the variance of tdd systems Timing Advance and the TDD mode guard time interval, wherein said Timing Advance are 2 times that the terminal propagation delay is arrived in the base station;
Divided by the duration of an OFDM symbol together with its Cyclic Prefix, acquired results rounded up obtains described N with described guard time interval.
10. a time division duplex terminal is characterized in that, comprising:
Transmitting element is used for carrying out the transmission of OFDM symbol at sending time slots, and wherein each sending time slots can send M OFDM symbol;
Control unit, be used for judging whether the next time slot of described sending time slots is receiving slot, if it is indicate described transmitting element to suspend transmission at last N OFDM symbol of this sending time slots, otherwise M OFDM symbol at sending time slots all normally sends, wherein 1≤N＜M.
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| 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 |
| 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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| CN1123993A (en) * | 1994-11-17 | 1996-06-05 | 国际商业机器公司 | Method and apparatus for direct communication in a TDMA radio communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1123993A (en) * | 1994-11-17 | 1996-06-05 | 国际商业机器公司 | Method and apparatus for direct communication in a TDMA radio communication 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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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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