CN101366214A - Methods and device for transmitting data from a first communication device to a second communication device - Google Patents
Methods and device for transmitting data from a first communication device to a second communication device Download PDFInfo
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Abstract
A method of transmitting data from a first communication device to a second communication device is provided. The method comprises transmitting at least one first data portion, transmitting a second data portion synchronized with the transmission of a corresponding data portion of a third communication device to the second communication device, and the transmission of the at least one first data portion being arranged such that it is received by the second communication device before the data portion of the third communication device corresponding to the second data portion.
Description
The application requires U.S. Provisional Application 60/734,114 (submitting to), 60/734 on November 7th, 2005, the priority of 080 (submitting to) and 60/796,355 (submitting to) on April 28th, 2006 on November 7th, 2005, the full content of these applications all purposes that are used for incorporated herein by reference.
The present invention relates to data are transferred to from first communication equipment method and the corresponding apparatus of second communication equipment.
The use of time-division in the communication technology is of long duration.In many application, the time-division is used for realizing two-way communication on the single communication resource.This occupation mode of time-division is called time division duplex (TDD).
In typical TDD uses, for downlink transmission and ul transmissions provide the time interval.In addition, providing the time slot between downlink transmission and the ul transmissions and between ul transmissions and downlink transmission, so that switch to receiving mode and when receiving mode switches to sending mode, allow parts to power on or power down from sending mode at communication equipment.This time slot is very little usually than the down link and the up link time interval.
In some applications, can there be other purposes the time slot.For example, in the IEEE802.22 radio area network (WRAN) [1] that proposes, the time slot between ul transmissions and downlink transmission can be used for sensing or determine whether some frequency range is being used or available.Figure 1 illustrates the diagram of the time slot relevant with transmission frame-form.Figure 2 illustrates another diagram of the time slot relevant with the ul transmissions process with down link.Follow-up this two diagrams will be described more specifically.
The new purposes of time slot is introduced and is described by the method and apparatus that limits in the application's corresponding independent claims.
In a first aspect of the present invention, a kind of method that data is transferred to second communication equipment from first communication equipment is provided, this method comprises at least one first data division of transmission, will be transferred to second communication equipment with second data division of the transmitting synchronous of the corresponding data of third communication equipment part, and the transmission that described at least one first data division is set was received it by second communication equipment before the data division of the third communication equipment corresponding with second data division.
Embodiments of the invention embody in the dependent claims.
For example, abundant when the second communication equipment when first communication equipment than third communication equipment, can arrange first communication equipment earlier to begin it and not disturb transmission to the transmission of second communication equipment from third communication equipment to second communication equipment than plan.This for example in, first communication equipment can be considered to " close " second communication equipment and third communication equipment can be considered to " away from " second communication equipment.
Said method has the following advantages: it makes otherwise can be used in transfer of data untapped free time that this for example will increase total system data throughput of transmissions.In addition, if be used for other function untapped free time as the transmission pilot frequency sequence, then this can make system can have better channel estimating, and therefore has better system performance.
In one embodiment, communication equipment can be but be not limited to wire communication facility, power line communications apparatus, radio communication equipment, terminal communication equipment or customer premises equipment, CPE.Radio communication equipment for example can be but be not limited to mobile radio communication apparatus, satellite radio or mobile radio base station.
Although TDD is generally used in the radio communication, TDD also can be used for non-wireless communication.Thereby in this embodiment, communication equipment also can be wire communication facility or power line communications apparatus.
During the time slot between the downlink transmission time interval and the uplink transmission time interval, can send at least one first data division.
In one embodiment, second data division can with uplink transmission time at interval initial synchronously.
In order preventing, to be necessary to arrange transmission to make and before second data division arrives, to receive first data division fully at second communication equipment in any conflict the between first data division and second data division.In addition, at second communication equipment, also may be between the beginning of the end of first data division and second data division life period gap.
In addition, if first communication equipment very close to second communication equipment, then might transmit one or more first data divisions.Because the very near geographic distance between first communication equipment and the second communication equipment, the transmission propagation delay is very little, therefore, has the more time to can be used to realize transmission.Thereby, can transmit one or more first data divisions.
Yet,, might only transmit one first data division if the geographic distance between first communication equipment and the second communication equipment is bigger.And,, then might can not transmit first data division if the distance between first communication equipment and second communication equipment is very big at all.Thereby in one embodiment, the transmission of at least one first data division depends on the geographic distance between first communication equipment and second communication equipment.
Usually, if for example the geographic distance between first communication equipment and the second communication equipment then might only transmit one first data division in the predetermined geographic distance range.Similarly, if for example the geographic distance between first communication equipment and the second communication equipment exceeds the predetermined geographic distance, then may can not transmit first data division at all.Thereby, in one embodiment, used a plurality of distance classifications, the different geographic distances of representative between first communication equipment and second communication equipment.
The transmission of at least one first data division is provided in the time interval before being arranged in the up link time frame in one embodiment, at least in part.
In one embodiment, receive time sequence information, and transmit at least one part in the first and second data division according to the time sequence information that receives from second communication equipment.In another embodiment, time sequence information is represented by the distance classification information of representing the distance between first communication equipment and the second communication equipment.
In one embodiment, carry out channel estimating.
In one embodiment, determine the number of the symbol in advance (pre-symbol) of allowing that can before second data division, transmit, and according to the number of determined symbol in advance of allowing at least one symbol in advance of transmission during first data division or afterwards and before second data division.
In one embodiment, can postpone second data division so that increase the size of first data division.
In one embodiment, used the multiple access transmission technology.For example, the multiple access transmission technology is selected from one group of multiple access transmission technology being made up of time division multiple access, frequency division multiple access, code division multiple access and OFDM.
In one embodiment, use the OFDM transmission technology, and adjust the length of Cyclic Prefix or the length of OFDM symbol.
Particularly, can be different from Cyclic Prefix and the symbol lengths that in second data division, uses at Cyclic Prefix that uses during first data division and symbol lengths.Can depend on the geographic distance between first communication equipment and the second communication equipment in the length of the length of the Cyclic Prefix that uses during first data division and OFDM symbol.Can depend on the geographic distance between third communication equipment and the second communication equipment in the length of the length of the Cyclic Prefix that uses during second data division and OFDM symbol.
In one embodiment, realize transmission according to data transmission frame structure, this data transmission frame structure comprises: comprise the downlink transmission subframe the first transfer of data subframe, comprise second transfer of data subframe of ul transmissions subframe and the transmission subframe of mourning in silence of representing the silence period section, wherein, mourn in silence the transmission subframe be arranged between the first transfer of data subframe and the second transfer of data subframe.
As used herein like that term " frame structure " is meant following form, and this form defines the time interval and how to be divided into a plurality of sons at interval.In this article, the time interval of predetermined amount of time is commonly referred to frame, and is commonly referred to subframe at interval according to the son that predetermined cutting procedure obtains.Thus, the gathering of a plurality of consecutive frames is commonly referred to superframe or frame group.
Usually, frame and subframe are used for transfer of data.Yet frame structure might have a plurality of frames and/or the subframe that is allocated for non-data-transformation facility such as controlled function.In this embodiment, distribute subframe to be used for sensing.
Subframe can have identical or different length (with regard to the time).Possible is that the subframe that is allocated for same function can have identical length.For example, all downlink data transmission subframe can have identical length.
Yet as previously mentioned, subframe can have different length.For example, the subframe that is allocated for sensing can have different length with downlink data transmission subframe.In another example, the uplink data transmission subframe also can have different length with downlink data transmission subframe.
Similarly, frame can have identical or different length.
As used herein such, term " sensing " is meant the available frequency range of determining in a plurality of frequency ranges.Thus, term " sensing subframe " is meant the silence period section of predetermined length.For example, the sensing subframe can be but be not limited to transmission-reception change gap (TTG) in the system of [1].Thereby in one embodiment, the method that is provided also is included in by definite available frequencies scope during the time period of the transmission subframe representative of mourning in silence.
In addition, as used herein such, the transmission on downlink transmission is meant from second communication equipment to first communications device orientations.Compare the transmission on ul transmissions is meant from first communication equipment to the second communication device orientation with downlink transmission.
In one embodiment, after definite available frequencies scope, also provide a downlink transmission time interval.
In one embodiment, after definite available frequencies scope, also provide a plurality of downlink transmission time intervals.
In one embodiment, after definite available frequencies scope, also provide a plurality of uplink transmission times at interval.
In one embodiment, wait for predetermined amount of time after the time interval, and determine the available frequencies scope in a plurality of frequency ranges after section expires at the fixed time in downlink transmission.In another embodiment, the size of setting predetermined amount of time makes via these frequency ranges communicating downlink transmission signals fully.
In one embodiment, in at least one data transmission frame structure, realize this method, wherein, the downlink subframe that provides at the downlink transmission time interval is provided data transmission frame structure, for sensing subframe that usable frequency provides and the uplink sub-frames that provides at interval at uplink transmission time are provided, wherein, the sensing subframe is arranged between downlink subframe and the uplink sub-frames.
In one embodiment, in at least one data transmission frame structure, realize this method, wherein, data transmission frame structure comprises the frame group, this frame group comprises head part and a plurality of frame, wherein, head part comprises the down link subdivision that is used for the downlink transmission time interval, and the sensing subdivision for determining that usable frequency provides.
In one embodiment, determine the available frequencies scope in a plurality of frequency ranges, the available frequencies scope is combined at least one combinational logic frequency range, and this at least one combinational logic frequency range is assigned to first communication equipment.
In one embodiment, scan a plurality of frequency ranges, and the signal in definite corresponding frequencies scope transmission is whether below predetermined threshold.Signal in the corresponding frequencies scope is transmitted under the situation below the predetermined threshold, and this frequency range is classified as available frequency range.Signal transmission in the corresponding frequencies scope is ignored this frequency range or it is categorized as unavailable not under the situation below the predetermined threshold.
In one embodiment, the control information from second communication equipment is received by first communication equipment.In another embodiment, the control information that receives by first communication equipment from second communication equipment can be about the information that whether allows to transmit first data division, about the information of first data division transmission beginning, about when allow to transmit first data division, when allowing the transmission of transmission first data division duration of first data division transmission information or about whether transmitting the information of symbol in advance.
In one embodiment, the data transmission parameters that is used for first data division can be different from the data transmission parameters that is used for second data division.Data transmission parameters for example can be but be not limited to signal modulation parameter such as data modulator approach and coding parameter such as coding method and code rate.Data modulation method for example can be but be not limited to binary phase shift keying (BPSK), Quadrature Phase Shift Keying (QPSK) and quadrature amplitude modulation (QAM).Coding method for example can be but be not limited to convolution code, Turbo code, block code and Turbo product code (TPC).
In a second aspect of the present invention, a kind of method that data is transferred to second communication equipment from first communication equipment is provided, this method comprises at least one first data division of transmission, is transferred to second communication equipment with second data division of the transmitting synchronous of the corresponding data of third communication equipment part, and according to the transmission of first communication equipment apart from described at least one first data division of geographic distance arrangement of second communication equipment.
In a third aspect of the present invention, provide a kind of generation to be used for data are transferred to from first communication equipment method of the data transmission frame structure of second communication equipment.This method comprises: generate the first transfer of data subframe that comprises the downlink transmission subframe, the second transfer of data subframe that generation comprises the ul transmissions subframe, the transmission subframe of mourning in silence that the silence period section is represented in generation, wherein, mourn in silence the transmission subframe be arranged between the first transfer of data subframe and the second transfer of data subframe.
In a fourth aspect of the present invention, a kind of communication equipment to other communication equipment transmission is provided, comprise with at least one first data division and with second data division of the transmitting synchronous of the corresponding data of third communication equipment part being transferred to the transmitter of other communication equipment, the transmission of described at least one first data division is configured such that it was received by second communication equipment before the data division of the third communication equipment corresponding with second data division.
As previous the qualification, communication equipment can be but be not limited to wire communication facility, power line communications apparatus, radio communication equipment, terminal communication equipment or customer premises equipment, CPE.Radio communication equipment for example can be but be not limited to mobile radio communication apparatus, satellite radio or mobile radio base station.
Each embodiment of the method for the second communication equipment of describing under the method environment, provided that data are transferred to from first communication equipment is effective to described equipment similarly.
Fig. 1 shows the frame structure of time division duplex (TDD) system.
Fig. 2 shows the diagram of the transmission course of TDD system.
Fig. 3 shows the communication system according to the embodiment of the invention.
Fig. 4 shows the diagram according to the transmission course of the TDD system of the embodiment of the invention.
Fig. 5 shows the frame structure according to the TDD system of the embodiment of the invention.
Fig. 6 shows another frame structure according to the TDD system of the embodiment of the invention.
Fig. 7 shows the parameter list that uses in the transmission course according to the TDD system of the embodiment of the invention.
Fig. 8 shows the diagram that changes according to frame structure in the TDD system of the embodiment of the invention.
Fig. 9 shows the results of property according to the TDD system of the embodiment of the invention.
Figure 10 shows another diagram according to the transmission course of the TDD system of the embodiment of the invention.
Figure 11 shows the example according to the information element of the communication information of the embodiment of the invention (IE).
Figure 12 shows the example according to the communication information of the embodiment of the invention.
Fig. 1 shows the frame structure 100 of example TDD system.
As shown in fig. 1, frame 101 comprises down link (DL) subframe 103, TTG 105 and up link (UL) subframe 107.Frame 101 illustrates the major part of TDD system respectively, the time slot between downlink transmission, downlink transmission and the ul transmissions.Frame structure 100 is used for proposed IEEE 802.22 radio area networks (WRAN) [1], also is used for IEEE802.16.d and IEEE 802.16.e standard.
Yet, the time corresponding gap is also arranged between ul transmissions and downlink transmission, this time slot does not illustrate in Fig. 1.For proposed IEEE 802.22 WRAN, this time slot is called reception-transmission change gap (RTG).
Fig. 2 shows the diagram of the transmission course of example TDD system.
In this diagram, use IEEE 802.22 WRAN that propose as example, the sub-district in the WRAN network comprises 201 and 2 customer premises equipment, CPEs in base station (BS) (CPE) i.e. first customer premises equipment, CPE (CPE1) 203 and second customer premises equipment, CPE (CPE2) 205.First customer premises equipment, CPE (CPE1) 203 is geographically than second customer premises equipment, CPE (CPE2), 205 more close base stations (BS) 201.
When the transmission during downlink subframe 207 is carried out in base station 201, before arriving first customer premises equipment, CPE (CPE1) 203, need some times.This time is commonly referred to propagation delay.Because first customer premises equipment, CPE (CPE1) 203 is than second customer premises equipment, CPE (CPE2), 205 more close base stations 201, so, to the propagation delay T of first customer premises equipment, CPE (CPE1) 203
PD1209 than the propagation delay T to second customer premises equipment, CPE (CPE2) 205
PD2211 and Yan Gengxiao.
When the transmission during the downlink subframe 207 is final when arriving second customer premises equipment, CPE (CPE2) 205, before switching to sending mode from receiving mode, second customer premises equipment, CPE (CPE2) 205 is waited for section T blink
DS2213 to guarantee to finish the reception to the transmission during the downlink subframe 207.The time representation of finishing this handoff procedure and needing is T
SSRTG215.Then, carry out at the transmission during the uplink sub-frames of second customer premises equipment, CPE (CPE2) to base station BS 201, it is expressed as UL2 217.After time period transmission, that be expressed as TTG219 of downlink subframe 207, at the 217 final base station BSs 201 that arrive of the transmission UL2 during the uplink sub-frames of second customer premises equipment, CPE, wherein TTG is transmission-time of reception gap.
Thus as can be seen, at first customer premises equipment, CPE (CPE1) 203: considering corresponding stand-by period T
DS2225 and corresponding switching time T
SSRTGAfter 227, there was " freedom " time 229 of a great deal of before transmit uplink transmission UL1 223.It can also be seen that when the geographic distance between first customer premises equipment, CPE (CPE1) 203 and base station BS 201 was nearer, this " freedom " time 229 was bigger.
Fig. 3 shows the communication system 300 according to the embodiment of the invention.
For fear of causing to TV broadcasting with to the interference of the 74th equipment component, WRAN equipment such as base station (BS) and customer premises equipment, CPE (CPE) must carry out the reliability detection to the communication service of being responsible for when the availability of definite frequency range that they are worked.
Thus, communication equipment (CD1 305, CD2 307 and CD3 309) can be customer premises equipment, CPE (CPE).
Fig. 4 shows the diagram according to the transmission course of the TDD system of the embodiment of the invention.
Be similar to Fig. 2, in this diagram, use IEEE 802.22 WRAN that propose as example, the sub-district in the WRAN network comprises 401 and 2 customer premises equipment, CPEs in base station (BS) (CPE) i.e. first customer premises equipment, CPE (CPE1) 403 and second customer premises equipment, CPE (CPE2) 405.First customer premises equipment, CPE (CPE1) 403 is geographically than second customer premises equipment, CPE (CPE2), 405 more close base stations (BS) 401.As the another diagram of using Fig. 3, first customer premises equipment, CPE (CPE1) 403 can be the first communication equipment CD1 305 or second communication equipment CD2307, and second customer premises equipment, CPE (CPE2) 405 can be the 3rd communication equipment CD3 309.
When the transmission during downlink subframe 407 is carried out in base station 401, because propagation delay needed some times before arriving first customer premises equipment, CPE (CPE1) 403.Because first customer premises equipment, CPE (CPE1) 403 is than second customer premises equipment, CPE (CPE2), 405 more close base stations 401, so, to the propagation delay T of first customer premises equipment, CPE (CPE1) 403
PD1409 than the propagation delay T to second customer premises equipment, CPE (CPE2) 405
PD2411 and Yan Gengxiao.
When the transmission during the downlink subframe 407 is final when arriving second customer premises equipment, CPE (CPE2) 405, before switching to sending mode from receiving mode, second customer premises equipment, CPE (CPE2) 405 is waited for section T blink
DS2413 to guarantee to finish the reception to the transmission during the downlink subframe 407.Finishing the needed time representation of this handoff procedure is T
SSRTG415.Then, be used for the transmission during the uplink sub-frames of second customer premises equipment, CPE (CPE2) to base station BS 401, it is expressed as UL2 417.After time period transmission, that be expressed as TTG419 of downlink subframe 407, the transmission UL2 417 final base station BSs 401 that arrive during the uplink sub-frames that is used for second customer premises equipment, CPE, wherein TTG is transmission-time of reception gap.
Be different from Fig. 2, in this case, owing to arranged, a large amount of " freedom " time (comprise be expressed as time interval of 429 and 431 with) between receiving downlink transmission and beginning ul transmissions so first customer premises equipment, CPE (CPE1) 403 begins its ul transmissions in early days.As can be seen, when the geographic distance between first customer premises equipment, CPE (CPE1) 403 and base station BS 401 is nearer, this " freedom " time will be bigger.
Utilize early stage transmission, first customer premises equipment, CPE (CPE1) 403 transmits the first that is expressed as UL1-1 431 of its ul transmissions earlier.Correspondingly, the second portion of its ul transmissions is expressed as UL1-2 423.
The first receiving uplinks transmission of base station BS 401 UL1-1 431 then are ul transmissions UL1,2 421, and ul transmissions UL1 wherein, 2 421 comprise ul transmissions UL1-2 423 and ul transmissions UL2 417.Be similar to Fig. 2, ul transmissions UL1-2 423 and UL2417 arrive BS 401 simultaneously, thereby they are synchronous, but compare with ul transmissions UL2417, and ul transmissions UL1-2 423 transmits on different frequency channels.
For first customer premises equipment, CPE (CPE1) 403 earlier begins its ul transmissions, satisfy several requirements in this embodiment.At first, require base station BS 401 to know first customer premises equipment, CPE (CPE) 403 transmission more early.Otherwise base station BS 401 may this early stage transmission of unripe reception.Therefore, exchange of control information before transmitting in early days.
Secondly, make its second portion UL1-2 423 of ul transmissions synchronous, make the beginning of second portion UL1-2 423 of the beginning of normal transmission (for example ul transmissions UL2 417) and its ul transmissions almost arrive base station BS 401 simultaneously.This requirement needs, so that keep existing frame boundaries.
The 3rd, have only first customer premises equipment, CPE (CPE1) 403 fully just to transmit in early days near base station BS 401, the first customer premises equipment, CPEs (CPE1) 403.Thus, as first customer premises equipment, CPE (CPE1) 403 during very close to base station 401 BS, if it is the system requirements of pre-sizing that the first of ul transmissions is arranged, then might first customer premises equipment, CPE (CPE1) 403 can transmit first more than one ul transmissions.On the other hand, if not having the first of ul transmissions is the system requirements of pre-sizing, then when first customer premises equipment, CPE (CPE1) the 403 bigger first that first customer premises equipment, CPE (CPE1) 403 can the transmit uplink transmission during very close to base station BS 401.
For example, at proposed IEEE 802.22 WRAN[1 that use OFDM (OFDMA) as multiple access technology] in, the first that ul transmissions is arranged is the system requirements of the multiple of OFDMA symbol.Therefore, in this case, possible first customer premises equipment, CPE (CPE1), 403 transmission are more than the first of one ul transmissions, and wherein the size of the first of ul transmissions is fixed as an OFDMA symbol.
Contrast with early stage ul transmissions, also might implement " later stage (late) " ul transmissions scheme.Can be used for transmitting for example control information or in order to improve the pilot tone of channel estimating from the time that " later stage " ul transmissions obtains.
The later stage ul transmissions also can be used for increasing the size of first data division.For example, use the diagram among Fig. 4, can on CPE2 (405), apply the later stage ul transmissions so that increase the size of the early stage ul transmissions part of CPE1 (403).
Fig. 5 shows the frame structure 500 according to the TDD system of the embodiment of the invention.
Be similar to Fig. 1, in this diagram, frame 501 comprises down link (DL) subframe 503, transmission-reception change gap (TTG) 505 (being expressed as TTG2,3,4,5,6,7) and up link (UL) subframe 507.Frame 501 illustrates the major part of TDD system respectively, downlink transmission, the time slot between downlink transmission and ul transmissions.
Yet, also having the time corresponding gap between ul transmissions and downlink transmission, it is not shown in Fig. 5.For proposed IEEE 802.22 WRAN, this time slot is called reception-transmission change gap (RTG).
In this embodiment, frame structure 500 is used to have the proposed IEEE 802.22 WRAN sub-districts of base station BS and 7 customer premises equipment, CPE CPE.For example, the burst in downlink subframe 509 (brust) 1 is and the relevant transmission of first customer premises equipment, CPE (CPE1) that wherein the burst 1 in the uplink sub-frames 511 is early stage ul transmissions with burst 1 in uplink sub-frames 511.Correspondingly, the transmission-reception change gap TTG that is used for first customer premises equipment, CPE (CPE1) is that TTG1 513 is TTG2 for the transmission that is used for other customer premises equipment, CPE CPE-reception change gap TTG, 3,4,5,6, and 7505 is shorter.
Fig. 6 shows another frame structure 600 according to the TDD system of the embodiment of the invention.
In this diagram, the item that is labeled as 600-613 corresponds respectively to the item that is labeled as 500-513 among Fig. 5.Yet in this embodiment, early stage ul transmissions is shared by burst 1,2 611, that is, and and the combination of the ul transmissions of the ul transmissions of first customer premises equipment, CPE (CPE1) and second customer premises equipment, CPE (CPE2).In this case, for example, the ul transmissions of first customer premises equipment, CPE (CPE1) can be used some frequency channels and the ul transmissions of second customer premises equipment, CPE (CPE2) can be used not other frequency channels that is used by first customer premises equipment, CPE (CPE1).Correspondingly, TTG4,5,6,7 405 is the transmission-reception change gap TTG that are used for customer premises equipment, CPE CPE 4,5,6 and 7, and TTG1, the 2nd, be used for transmission-reception change gap TTG of customer premises equipment, CPE CPE 1 and CPE 2.
Fig. 7 shows the parameter list 700 that uses in the transmission course according to the TDD system of the embodiment of the invention.These parameters obtain at several distortion of proposed IEEE 802.22 WRAN that use OFDMA.As seen, free time T
IDLE701 for all parameter sets always greater than OFDMA symbol time T
OFDMA703.This means for proposed IEEE802.22 WRAN, even still always may allow early stage ul transmissions sub-district with full-size 33km radius.For free time T is described
IDLE701 can be by 229 expressions of the item among Fig. 2.
Fig. 8 shows the diagram that changes according to frame structure in the TDD system of the embodiment of the invention.Under the situation of proposed IEEE 802.22 WRAN, the amount that length that also might be by reducing Cyclic Prefix (CP) and fast Fourier transform (FFT) size be increased in the free time that is used near customer premises equipment, CPE CPE of using in the transmission.This is because therefore near the shorter delay transit of customer premises equipment, CPE CPE experience need not long loop prefix CP.Chart 801 shows normal condition, and chart 803 shows the length of Cyclic Prefix (CP) and the situation that the fast Fourier transform (FFT) size has reduced.
Fig. 9 shows the results of property 900 according to the TDD system of the embodiment of the invention.
Use IEEE 802.22 WRAN that propose in this diagram, if customer premises equipment, CPE CPE is positioned at the 5km geographic distance from BS, then this customer premises equipment, CPE CPE is defined as nearly equipment.In this case, also allow nearly customer premises equipment, CPE CPE to utilize the 64-QAM modulation, use higher message transmission rate, because nearer customer premises equipment, CPE CPE has more high s/n ratio (SNR) usually together with speed 3/4 code rate.
According to the results of property Figure 80 0 that obtains from emulation, as can be seen, be the situation of nearly customer premises equipment, CPE CPE for 10% of all customer premises equipment, CPE CPE, it is nearly 55% to improve the UL throughput, and wherein frame sign is 5ms and use 1/4CP.In addition, under all other situations, also observe improvement in performance.These results show when enforcement method and apparatus provided by the present invention on real system, can improve by estimated performance.
Figure 10 shows another diagram according to the transmission course of the TDD system of the embodiment of the invention.
In this diagram, the normal uplink Transmission Time Interval is expressed as normal time division duplex (NTDD district) 1001, and early stage uplink transmission time time interval is self adaptation TDD (ATDD) district 1003.ATDD_Start_Time 1005 and ATDD_End_Time 1007 these two parameters are represented the time started and the concluding time of early stage ul transmissions respectively.
Figure 11 shows the example according to the information element of the communication information of the embodiment of the invention (IE).
When or how information element shown in Figure 11 for example can be used for communication information will carry out with the relevant early stage ul transmissions of notifying communication equipment.For example, in Figure 10, illustrate ATDD_Start_Time parameter in the information entity shown in Figure 11.
Figure 12 shows the example according to the communication information of the embodiment of the invention.
Communication information shown in Figure 12 is to be used for the example of the communication information when or how the relevant early stage ul transmissions of notifying communication equipment will carry out.In addition, for example can use the distribution time started parameter among Figure 12 that the ATDD_End_Time parameter shown in Figure 10 is set.
In addition, for all communication systems of utilizing TDD, existed and to have made the scheme that is used for determining propagation delay by base station BS and customer premises equipment, CPE CPE, as initial range finding and periodic ranging.So which customer premises equipment, CPE CPE is the parameter relevant with propagation delay can be used for determining near base station BS, wherein these CPE can be allowed to begin early stage ul transmissions.
In this document, quote following publication:
[1] ＂ APHY/MAC Proposal for IEEE 802.22 WRAN System, Part2:TheCognitive MAC ＂, by ETRI, FT, HuaWei, I2R, Motorola, NextWave, Philips, Runcom, Samsung, STM, Thomson suggestion, in March, 2006.
Claims (39)
1. one kind is transferred to the method for second communication equipment with data from first communication equipment, comprising:
Transmit at least one first data division;
To be transferred to described second communication equipment with second data division of the transmitting synchronous of the corresponding data of third communication equipment part; And
The transmission that described at least one first data division is set makes it be received by described second communication equipment before the described data division of the described third communication equipment corresponding with described second data division.
2. method according to claim 1,
The transmission of described at least one first data division depends on the geographic distance between described first communication equipment and the described second communication equipment.
3. method according to claim 1,
Use a plurality of distance classifications of the different geographic distances between described first communication equipment of representative and the described second communication equipment.
4. method according to claim 1,
Provide the transmission of described at least one first data division in the time interval before the time interval at least in part being arranged on up link.
5. method according to claim 1 also comprises:
Receive time sequence information from described second communication equipment; And
Transmit in described first data division and second data division at least one according to the time sequence information that is received.
6. method according to claim 5,
Described time sequence information is represented by the distance classification information of the distance between described first communication equipment of representative and the described second communication equipment.
7. method according to claim 1 also comprises:
Carry out channel estimating.
8. method according to claim 1 also comprises:
The number of definite symbol in advance of allowing that can before described second data division, transmit;
According to the number of determined symbol in advance of allowing, at least one symbol in advance of transmission during described first data division or afterwards and before described second data division.
9. method according to claim 1 also comprises:
Use the multiple access transmission technology.
10. method according to claim 9,
Described multiple access transmission technology is selected from one group of multiple access transmission technology being made up of following:
Time division multiple access,
Frequency division multiple access,
Code division multiple access,
OFDM.
11. method according to claim 1,
Use the OFDM transmission technology; And
Adjust the length of Cyclic Prefix and/or the length of OFDM symbol.
12. method according to claim 1,
Carry out described transmission according to data transmission frame structure, described data transmission frame structure comprises:
The first transfer of data subframe that comprises the downlink transmission subframe;
The second transfer of data subframe that comprises the ul transmissions subframe;
Represent the transmission subframe of mourning in silence of silence period section, the described transmission subframe of mourning in silence is arranged between described first transfer of data subframe and the described second transfer of data subframe.
13. method according to claim 12 also comprises:
During time period, determine available frequency range by the described transmission subframe representative of mourning in silence.
14. method according to claim 13 also comprises:
After determining described available frequency range, also provide a downlink transmission time interval.
15. method according to claim 13 also comprises:
After determining described available frequency range, also provide a plurality of downlink transmission time interval.
16. the method according to claim 13 also comprises:
After determining described available frequency range, also provide a plurality of uplink transmission times at interval.
17. method according to claim 13 also comprises:
Wait for predetermined amount of time in described downlink transmission after the time interval;
After expiring, described predetermined amount of time determines the available frequency range in a plurality of frequency ranges.
18. method according to claim 17,
The size of setting described predetermined amount of time makes described downlink transmission signal transmit fully by described frequency range.
19. method according to claim 1,
Carry out described method at least one data transmission frame structure, wherein said data transmission frame structure comprises:
The downlink subframe that provides for the described downlink transmission time interval;
Be the sensing subframe of determining that usable frequency provides; And
The uplink sub-frames that provides at interval for described uplink transmission time;
Described sensing subframe is arranged between described downlink subframe and the described uplink sub-frames.
20. method according to claim 1,
Carry out described method at least one data transmission frame structure, wherein said data transmission frame structure comprises the frame group, and described frame group comprises head part and a plurality of frame,
Described head part comprises the down link subdivision that is used for the downlink transmission time interval; And
Be the sensing subdivision of determining that usable frequency provides.
21. method according to claim 1 also comprises:
Determine the available frequency range in a plurality of frequency ranges;
Described available frequency range is combined at least one combinational logic frequency range; And
Described at least one combinational logic frequency range is distributed to described first communication equipment.
22. method according to claim 1 also comprises:
Scan a plurality of frequency ranges;
Determine that signal transmission in frequency range separately is whether below predetermined threshold;
Signal in described frequency range separately is transmitted under the situation below the described predetermined threshold, and frequency range is categorized as available frequency range;
Signal transmission in described frequency range is separately ignored frequency range or frequency range is categorized as unavailable not under the situation below the described predetermined threshold.
23. one kind is used for data are transferred to the method for second communication equipment from first communication equipment, comprises:
Transmit at least one first data division;
To be transferred to described second communication equipment with second data division of the transmitting synchronous of the corresponding data of third communication equipment part; And
The transmission of described at least one first data division is set according to the geographic distance of described first communication equipment and described second communication equipment.
24. a generation is used for data are transferred to the method for the data transmission frame structure of second communication equipment from first communication equipment, described method comprises:
Generation comprises the first transfer of data subframe of downlink transmission subframe;
Generation comprises the second transfer of data subframe of ul transmissions subframe;
Generate the transmission subframe of mourning in silence of representing the silence period section, the described transmission subframe of mourning in silence is arranged between described first transfer of data subframe and the described second transfer of data subframe.
25. the communication equipment to other communication equipment transmission comprises:
Transmitter is transferred to described other communication equipment with at least one first data division and with second data division of the transmitting synchronous of the corresponding data of third communication equipment part; And the transmission that described at least one first data division is set makes it be received by second communication equipment before the described data division of the described third communication equipment corresponding with described second data division.
26. communication equipment according to claim 25,
It is wire communication facility.
27. communication equipment according to claim 25,
It is power line communications apparatus.
28. communication equipment according to claim 25,
It is radio communication equipment.
29. communication equipment according to claim 28,
It is mobile radio communication apparatus.
30. communication equipment according to claim 28,
It is satellite radio.
31. communication equipment according to claim 28,
It is mobile radio base station.
32. communication equipment according to claim 25,
Be terminal communication equipment.
33. communication equipment according to claim 25,
It is customer premises equipment, CPE.
34. method according to claim 1 also comprises:
By described first communication equipment from described second communication equipment receiving control information.
35. method according to claim 34, wherein said control information comprise following at least one:
Whether allow the transmission of first data division;
The beginning of the transmission of first data division;
When allow the transmission of first data division; And
When allowing the transmission of first data division, the duration of the transmission of first data division.
36. method according to claim 35, wherein said control information also comprise whether transmitting symbol in advance.
37. method according to claim 11 also comprises:
The length of definite Cyclic Prefix that can during described first data division, use and/or the length of OFDM symbol; And
The length of definite Cyclic Prefix that can during described second data division, use and/or the length of OFDM symbol.
38. method according to claim 11, wherein:
Can depend on the geographic distance between described first communication equipment and the described second communication equipment in the length of the length of the Cyclic Prefix that uses during described first data division and OFDM symbol; And
Can depend on the geographic distance between described third communication equipment and the described second communication equipment in the length of the length of the Cyclic Prefix that uses during described second data division and OFDM symbol.
39. method according to claim 11, the data transmission parameters that wherein is used for described first data division is different from the data transmission parameters that is used for described second data division.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US73411405P | 2005-11-07 | 2005-11-07 | |
| US60/734,114 | 2005-11-07 | ||
| US60/734,080 | 2005-11-07 | ||
| US60/796,355 | 2006-04-28 |
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| Publication Number | Publication Date |
|---|---|
| CN101366214A true CN101366214A (en) | 2009-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006800475964A Pending CN101366214A (en) | 2005-11-07 | 2006-11-06 | Methods and device for transmitting data from a first communication device to a second communication device |
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| CN (1) | CN101366214A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104604195A (en) * | 2012-08-05 | 2015-05-06 | Lg电子株式会社 | Method of configuring cyclic prefix for small cell in wireless communication system and apparatus therefor |
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- 2006-11-06 CN CNA2006800475964A patent/CN101366214A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104604195A (en) * | 2012-08-05 | 2015-05-06 | Lg电子株式会社 | Method of configuring cyclic prefix for small cell in wireless communication system and apparatus therefor |
| US9843434B2 (en) | 2012-08-05 | 2017-12-12 | Lg Electronics Inc. | Method of configuring cyclic prefix for small cell in wireless communication system and apparatus therefor |
| CN104604195B (en) * | 2012-08-05 | 2018-06-15 | Lg 电子株式会社 | The method and its equipment of the cyclic prefix of cell are configured in a wireless communication system |
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Application publication date: 20090211 |