CN101026468A - Business data transmitting method and device - Google Patents
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Abstract
The transmission method includes steps: first, carrying out statistics for up going, down going service data quantity; then, based on result of statistics, and code modulation modes utilized by up going, down going channels to determine proportion of sub frames between up going and down going service data quantities in wireless frames; finally, transmitting traffic data in up going, down going wireless sub frames according to the said proportion. The disclosed service data transmission device includes following units: traffic statistical unit in use for carrying out statistics for up going, down going traffic; determination unit is in use for determining proportion of sub frames for transmitting up going, down going traffic data in wireless frame based on the statistical result, and code modulation modes utilized by up going, down going channels; transmission data in use for transmitting traffic data according to the proportion.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of transmission method and device of business datum.
Background technology
In communication system, two kinds of dual-modes of FDD and TDD are arranged.Wherein, FDD refers to that uplink and downlink use different frequency resources, and communication node is received and dispatched simultaneously on different frequencies; TDD refers to that uplink and downlink use identical frequency resource, and communication node is received and dispatched on same frequency, but transmitting-receiving is not simultaneously.For FDD,, therefore on time domain, there is not uplink and downlink mutual restriction problem because different frequent points is used in the communication node transmitting-receiving; But for TDD,, so just can not use simultaneously on the time domain because a frequency is being used in the communication node transmitting-receiving.In a complete TDD radio frames, comprise sub-frame of uplink and descending sub frame, descending sub frame refers to by the base station and sends to this direction of terminal, and sub-frame of uplink refers to from terminal and sends to this direction of base station, and business datum is transmitted on the uplink and downlink subframe.
The uplink and downlink subframe adopts the fixed allocation ratio in the radio frames under the tdd mode at present.1: 1 ratio for example comparatively commonly used, the time that the subframe that promptly is used to transmit the subframe of uplink business data and transmit downlink service data takies is identical, and the general resource of the frequency that system distributes under tdd mode also is identical, so the uplink and downlink business throughput about equally.This is suitable for traditional symmetrical service such as IP phone or voice conferencing, because these professional uplink and downlink data quantity transmitted are basic identical.
But along with the development based on the wireless access wide band technology on the IEEE 802.16 air protocol bases, network provides increasing non-symmetrical service.For example, downlink business can require more bandwidth sometimes, and as business, streaming media service etc. such as interactive entertainment business, network browsings, promptly the data volume of downlink transfer is usually greater than the traffic carrying capacity of uplink.At this moment, for transmitting uplink business data and being to transmit the time of downlink service data distribution with general resource is still identical frequently, but need the uplink business data amount of transmission but to be less than the downlink service data amount far away, and then the frequency spectrum resource that has caused sub-frame of uplink to provide is not fully used, and limited frequency spectrum resources is by serious waste.
Summary of the invention
The object of the present invention is to provide a kind of transmission method and device of business datum, to solve the existing subframe that adopts fixed proportion to distribute transmission uplink and downlink business datum in the radio frames, the uplink and downlink data business volume that causes network to provide causes the technical problem of frequency spectrum resource waste when changing.
For solving the problems of the technologies described above, the objective of the invention is to be achieved through the following technical solutions: a kind of service data transmission method: uplink and downlink business datum amount is added up; According to the code modulation mode of described statistics and the use of uplink and downlink channel, determine to be used in the radio frames transmit the ratio of uplink and downlink business datum subframe; According to described ratio, service data transmission in the uplink and downlink wireless sub-frame.
Preferably, according to the code modulation mode that the uplink and downlink channel uses, calculate the intrinsic unit throughput ratio of uplink and downlink subframe; According to the intrinsic unit throughput ratio and the described uplink and downlink business datum amount statistics of described uplink and downlink subframe, determine to be used in the radio frames transmit the ratio of uplink and downlink business datum subframe.
Preferably, the coded system of using when described up channel is QAM16-3/4, the code modulation mode that down channel uses is during as QAM64-3/4, if uplink and downlink business datum amount statistics is roughly 1: 1, the ratio of then described uplink and downlink subframe is 2: 3; If uplink and downlink business datum amount statistics is roughly 3: 2, the ratio of then described uplink and downlink subframe is 1: 1; If uplink and downlink business datum amount statistics is roughly 2: 1, then the ratio of uplink and downlink subframe is 4: 3; If uplink and downlink business datum amount statistics is roughly 9: 4, the ratio of then described uplink and downlink subframe is 3: 2; If uplink and downlink business datum amount statistics is roughly 3: 1, the ratio of then described uplink and downlink subframe is 2: 1.；
A kind of business data transmission device comprises the traffic volume measurement unit, is used for uplink and downlink business datum amount is added up; Determining unit is used for the code modulation mode according to described statistics and the use of uplink and downlink channel, determines to be used in the radio frames transmit the ratio of uplink and downlink business datum subframe; Transmission unit is used for according to described ratio service data transmission in the uplink and downlink wireless sub-frame.
Preferably, described determining unit comprises that first determines subelement, is used for the code modulation mode according to the use of uplink and downlink channel, determines the intrinsic unit throughput ratio of uplink and downlink subframe; Second determines subelement, is used for intrinsic unit throughput ratio and described uplink and downlink business datum amount statistics according to described uplink and downlink subframe, determines to be used in the radio frames transmit the ratio of uplink and downlink business datum subframe.
A kind of service data transmission method: uplink and downlink business datum amount is added up based on orthogonal frequency division multiplexi; According to the code modulation mode of described statistics and the use of uplink and downlink channel, determine to be used in the radio frames transmit the ratio of uplink and downlink business datum subframe; According to effective frequency division multiplex OFDM total number of symbols of described uplink and downlink subframe ratio and radio frames carrying, determine the OFDM number of symbols in the uplink and downlink subframe; According to OFDM number of symbols in the described uplink and downlink subframe, service data transmission in the uplink and downlink OFDM symbol of wireless sub-frame carrying.
Preferably, according to the code modulation mode that the uplink and downlink channel uses, calculate the intrinsic unit throughput ratio of uplink and downlink subframe; According to the intrinsic unit throughput ratio and the described uplink and downlink business datum amount statistics of described uplink and downlink subframe, determine to be used in the radio frames transmit the ratio of uplink and downlink business datum subframe.
Described method also comprises: according to the restriction of OFDMA physical layer, adjust uplink and downlink OFDM number of symbols.
Preferably, be under the 5ms situation in radio frames length, when channel width was the integral multiple of 1.25MHz, described descending OFDM number of symbols was 17, upgoing O FDM number of symbols is 30; Or described descending OFDM number of symbols is 23, and upgoing O FDM number of symbols is 24; Or described descending OFDM number of symbols is 29, and upgoing O FDM number of symbols is 18; Or described descending OFDM number of symbols is 35, and upgoing O FDM number of symbols is 12.
Preferably, be under the 5ms situation in radio frames length, when channel width was the integral multiple of 1.75MHz, described descending OFDM number of symbols was 15, upgoing O FDM number of symbols is 18; Or described descending OFDM number of symbols is 21, and upgoing O FDM number of symbols is 12.
Preferably, be under the 5ms situation in radio frames length, when channel width was the integral multiple of 8.75MHz, described descending OFDM number of symbols was 15, upgoing O FDM number of symbols is 27; Or described descending OFDM number of symbols is 21, and upgoing O FDM number of symbols is 21; Or described descending OFDM number of symbols is 27, and upgoing O FDM number of symbols is 15.
A kind of business data transmission device based on orthogonal frequency division multiplexi comprises the traffic volume measurement unit, is used for uplink and downlink business datum amount and adds up; The ratio determining unit is used for the code modulation mode according to described statistics and the use of uplink and downlink channel, is identified for transmitting the ratio of uplink and downlink business datum subframe in radio frames; The number determining unit is used for the effective OFDM total number of symbols according to described uplink and downlink subframe ratio and radio frames carrying, determines uplink and downlink OFDM number of symbols; Transmission unit is used for according to described uplink and downlink OFDM number of symbols, service data transmission in the uplink and downlink OFDM symbol of wireless sub-frame carrying.
Described device also comprises adjustment unit, is used for the restriction according to the OFDM physical layer, adjusts OFDM number of symbols in the uplink and downlink.
Preferably, described ratio determining unit comprises first determining unit, is used for the code modulation mode according to the use of uplink and downlink channel, determines the intrinsic unit throughput ratio of uplink and downlink subframe; Second determining unit is used for intrinsic unit throughput ratio and described uplink and downlink data business volume statistics according to described uplink and downlink subframe, is identified for transmitting the ratio of uplink and downlink business datum subframe in radio frames.
Above technical scheme as can be seen, in the present invention owing at first uplink and downlink business datum amount is added up; According to the code modulation mode of statistics and the employing of uplink and downlink channel, determine the subframe ratio of transmission uplink and downlink business datum in the radio frames then; And then according to described ratio, service data transmission in the uplink and downlink wireless sub-frame.Make uplink and downlink subframe ratio match, thereby make the uplink and downlink frequency spectrum resource to make full use of, reach the purpose of limited frequency spectrum resources reasonable distribution with the uplink and downlink business datum amount that needs transmission.
Description of drawings
Fig. 1 is a service data transmission method embodiment flow chart disclosed by the invention;
Fig. 2 is a data traffic transmission apparatus structure schematic diagram disclosed by the invention;
Fig. 3 is the service data transmission method embodiment flow chart based on orthogonal frequency division multiplexi;
Fig. 4 is the business data transmission device structural representation based on orthogonal frequency division multiplexi.
Embodiment
Core concept of the present invention is according to uplink and downlink business datum amount, determines the subframe ratio of transmission uplink and downlink business datum in the radio frames.
See also Fig. 1, it is a service data transmission method embodiment flow chart disclosed by the invention.This method is applied in the wireless communication system of TDD mode.
Step 110: uplink and downlink business datum amount is added up.
Each operator can pass through charge system or other network management systems, uplink and downlink business datum amount in statistics certain hour section or the certain limit, obtain the business datum amount of certain phase uplink and the business datum amount of downlink transfer, and then know the general proportions relation of uplink and downlink service data transmission amount.
Step 120:, in radio frames, be identified for transmitting the ratio of uplink and downlink business datum subframe according to the code modulation mode of described statistics and the use of uplink and downlink channel.
At first, according to the code modulation mode that the uplink and downlink channel uses, calculate the uplink and downlink subframe because the unit throughput ratio that channel self causes.
Uplink and downlink have defined multiple code modulation mode: BPSK-1/2, QPSK-1/2, QPSK-3/4, QAM16-2/3, QAM16-3/4, QAM64-1/2 and QAM64-3/4 etc. in the WiMAX system.More the code modulation mode of high-order mean need be higher the demodulation signal to noise ratio.Because the link budget size of uplink and downlink is inconsistent, so the high order modulation coded system that uplink and downlink can use is different, common descending can be than the up use code modulation mode of high-order more.
The code modulation mode of the descending operable high-order that defines in the specifications parameter of MTG (mobile task groups) definition at present is QAM64-3/4; And up can use high-order code modulation mode be QAM16-3/4.Suppose that the code modulation mode that down channel uses is QAM64-3/4, the code modulation mode that up channel uses is QAM16-3/4, simultaneously since under the tdd mode uplink and downlink on same frequency, and use identical channel width, one skilled in the art will appreciate that the uplink and downlink subframe is owing to the intrinsic unit throughput ratio that channel self code modulation mode causes is at this moment:
Descending: up=6 * 3/4: 4 * 3/4=3/2
This paper only is to be example with high-order code modulation mode, and the uplink and downlink channel also can use other code modulation modes, and code modulation mode difference, the intrinsic unit throughput ratio of the uplink and downlink subframe that calculates are also different.Be to keep the narration consistency, below uplink and downlink channel among each embodiment all adopt the high-order code modulation mode that can use.
Secondly, according to the intrinsic unit throughput ratio and the described uplink and downlink data business volume statistics of described uplink and downlink subframe, determine the subframe ratio of transmission uplink and downlink business datum in the radio frames.The uplink business data amount size that can transmit in radio frames, on the one hand and time of taking of sub-frame of uplink be directly proportional, the intrinsic unit throughput that causes with the coded system of up channel employing is directly proportional on the other hand; In like manner, the downlink service data amount size that can transmit, on the one hand and time of taking of descending sub frame be directly proportional, the intrinsic unit throughput that causes with the coded system of down channel employing is directly proportional on the other hand.
Suppose that the time ratio that descending sub frame and sub-frame of uplink take in the radio frames is x: y, so:
1) when the business that network provides mainly be under the situation of symmetrical service, promptly need the upper and lower business datum data volume transmitted about equally, as a large amount of VoIP business, Video Phone (voice call), VideoConference (voice conferencing) etc. when professional, the time ratio x that takies of descending sub frame and sub-frame of uplink then: y should satisfy:
X * 6 * 3/4: y * 4 * 3/4=1: 1 calculating can get x: y=2: 3
2) when network carry be the non-symmetrical service data time, general downlink business requires more bandwidth, as business, streaming media service etc. such as interactive entertainment business, network browsings.
If the uplink and downlink business datum amount ratio of A actual count is roughly 3: 2, the time ratio x that takies of descending sub frame and sub-frame of uplink then: y should satisfy:
X * 6 * 3/4: y * 4 * 3/4=3: 2 calculating can get x: y=1: 1
If the uplink and downlink business datum amount ratio of B actual count is roughly 2: 1, the time ratio x that takies of descending sub frame and sub-frame of uplink then: y should satisfy:
X * 6 * 3/4: y * 4 * 3/4=2: 1 calculating can get x: y=4: 3
If the uplink and downlink business datum amount ratio of C actual count is roughly 9: 4, the time ratio x that takies of descending sub frame and sub-frame of uplink then: y should satisfy:
X * 6 * 3/4: y * 4 * 3/4=9: 4 calculating can get x: y=3: 2
If the uplink and downlink business datum amount ratio of D actual count is roughly 3: 1, the time ratio x that takies of descending sub frame and sub-frame of uplink then: y should satisfy:
X * 6 * 3/4: y * 4 * 3/4=3: 1 calculating can get x: y=2: 1
Several situations comparatively commonly used have more than been enumerated, if the time ratio x that descending sub frame that calculates under some situation and sub-frame of uplink take: y is not an integer: integer, such as x: y=2.1: 1.3, then usually the molecule and the denominator of this ratio rounded respectively, note is made x: y=2: 1.
Step 130: according to described ratio, service data transmission in the uplink and downlink wireless sub-frame.
This shows, can be by the present invention program operator according to the business datum Distribution Statistics in the practical application, the ratio of transmission uplink and downlink business datum subframe in the flexible configuration radio frames, and then can reasonably transmit the uplink and downlink business datum respectively in the uplink and downlink subframe, fully satisfy the service needed general resource of better utilization frequency simultaneously, improving the spectrum utilization efficiency of system.Though the foregoing description has only been enumerated the situation of downlink service data amount greater than the uplink business data amount, for the situation of uplink business data amount greater than the downlink service data amount, the present invention program is suitable for too.
See also Fig. 2, it is a kind of business data transmission device structural representation disclosed by the invention.
The transmitting device of described business datum comprises traffic volume measurement unit 21, determining unit 22 and transmission unit 23.Wherein, determining unit 22 comprises that again first determines subelement 221 and second definite subelement 223.Operation principle below in conjunction with this device is further understood its structure.
At first, operator adds up uplink and downlink business datum amount by traffic volume measurement unit 21, and then knows the general proportions relation of the business datum amount of the business datum amount of uplink and downlink transfer.
Then, determining unit 22 is identified for transmitting the ratio of uplink and downlink business datum subframe according to the code modulation mode of above-mentioned statistics that obtains and the use of uplink and downlink channel in radio frames.Particularly be exactly the single 221 yuan of code modulation modes that can use of first definite son, determine the intrinsic unit throughput ratio of uplink and downlink subframe according to the uplink and downlink channel; And then second determine intrinsic unit throughput ratio and the described uplink and downlink business datum amount statistics of subelement 222 according to described uplink and downlink subframe, determines the subframe ratio of transmission uplink and downlink business datum in the radio frames.
At last, transmission unit 23 is according to described ratio, service data transmission in the uplink and downlink wireless sub-frame.
More vivid in order to understand, please referring to a specific embodiment.For example suppose that the statistics that operator obtains by traffic volume measurement unit 21 is that network provides the non-symmetrical service data at present, and the downlink service data amount is greater than the uplink business data amount, both general proportions are 3: 2.In addition, the coded system that up channel is selected for use is QAM16-3/4, the coded system QAM64-3/4 that down channel is selected for use, and then determine that by first son obtains the uplink and downlink subframe because the intrinsic unit throughput ratio that channel coding method causes is for single 221 yuan
Descending: up=6 * 3/4: 4 * 3/4=3/2;
The size that is used to transmit the uplink business data amount in radio frames, on the one hand and time of taking of sub-frame of uplink be directly proportional, channel self throughput that causes with the coded system of up channel employing is directly proportional on the other hand; In like manner, the size of transmission downlink service data amount, on the one hand and time of taking of descending sub frame be directly proportional, channel self throughput that causes with the coded system of down channel employing is directly proportional on the other hand.
According to above-mentioned theory, second determines that subelement 222 can be according to the intrinsic throughput ratio 3: 2 of described descending and sub-frame of uplink and descending and uplink business data amount ratio that statistics draws 3: 2, and the subframe ratio of determining to be used in wireless to transmit the uplink and downlink business datum is 1: 1.At last, according to above-mentioned 1: 1 ratio, service data transmission in the uplink and downlink wireless sub-frame.Detailed process was above being done introduction in detail, thereby this place repeats no more.
Please referring to Fig. 3, its service data transmission method embodiment flow chart based on orthogonal frequency division multiplexi disclosed by the invention, this method is applied in the wireless communication system of TDD mode.
Step 310: the uplink and downlink data business volume is added up.
Step 320:, in radio frames, be identified for transmitting the ratio of uplink and downlink business datum subframe according to the code modulation mode of statistics and the use of uplink and downlink channel.
At first, according to the code modulation mode that the uplink and downlink channel uses, determine the uplink and downlink subframe because the intrinsic unit throughput ratio that channel self code modulation mode causes.Then, according to the intrinsic unit throughput ratio and the described uplink and downlink data business volume statistics of described uplink and downlink subframe, determine the ratio of transmission uplink and downlink business datum subframe in the radio frames.This step had been done in step 120 embodiment illustrated in fig. 1 in detail and had been introduced, thereby repeated no more herein.
Step 330:, determine uplink and downlink OFDM number of symbols according to effective frequency division multiplex OFDM total number of symbols of described allocation proportion and radio frames carrying;
Described effective OFDM total number of symbols can calculate according to following step: according to radio frames length and receipts/send out mutual conversion interval, calculate the valid wireless frame length; According to valid wireless frame length and OFDM symbol lengths, calculate effective OFDM total number of symbols of radio frames carrying then.
According to the definition of current WiMAX MTG, wireless frame length is 5ms, considers the descending lead code and the expense of broadcast simultaneously, is equal to substantially with the up expense of intercepting symbol and up some administrative messags.Consider SOFDMA (extendible orthogonal frequency division multiplexing multiple access) simultaneously, adopt different FFT to count at different channel width sizes, use 512 FFT such as the 5MHz bandwidth, the 10MHz bandwidth is used 1024 FFT, and the 20MHz bandwidth is used 2048 FFT, thereby guarantees that identical OFDM symbol period is arranged under different bandwidth situation.Choosing of sample frequency factor of n, different channel width has different values, mainly contains following several situation:
(1), when channel width is the multiple of 1.75MHz, n=8/7
(2), channel width is 1.25,1.5,2 or, 2.75 MHz, n=28/25
(3), other channel width granularity, n=8/7 introduces respectively in detail at above-mentioned three kinds of situations:
When (one) channel width is the multiple of 1.25MHz, use n=28/25, consider following typical bandwidth:
Table 1
| BW | 5 | MHz | 10 | MHz | 20 | MHz |
| Fs | 5.6 | MHz | 11.2 | MHz | 22.4 | MHz |
| Tb | 91.42857 | us | 91.42857 | us | 91.42857 | us |
| Tg | 11.42857 | us | 11.42857 | us | 11.42857 | us |
| Ts | 102.8571 | us | 102.8571 | us | 102.8571 | us |
Wherein, BW is a channel width, and Fs is a sample frequency, and Tb is the effective time of OFDM symbol, and Tg is the blanking time of OFDM symbol, and Ts is a complete OFDM symbol lengths.
Can know from last table, an OFDM symbol lengths is 102.8571us, accurately, the radio frames of 5ms length comprises 48.61111 OFDM symbols, the length of considering RTG (receiving/send out conversion interval) and TTG (sending out/receive conversion interval) probably is about 50us, so the OFDM symbol that comprise effective time in the radio frames of 5ms is 47 (the number round numbers of OFDM symbol usually).That is to say that this 47 OFDM symbols are only is used to be distributed by up-downgoing.The uplink and downlink wireless sub-frame ratio that obtains in the integrating step 320 is again distributed uplink and downlink OFDM number of symbols in addition, and is specific as follows:
1) when the business that network provides mainly be under the situation of symmetrical service, during as business such as a large amount of VoIP business, Video Phone (voice call), Video Conference (voice conferencing), the time ratio x that takies of descending sub frame and sub-frame of uplink then: y should satisfy x * 6 * 3/4: y * 4 * 3/4=1: 1 calculates and can get x: y=2: 3, again because effective totally 47 of OFDM symbols, and then know by inference:
The descending OFDM number of symbols of determining is 19, and upgoing O FDM number of symbols is 28.
Further, in the definition of the OFDMA of current WiMAX physical layer, descending sub frame is made up of the symbol of transmission preamble sign indicating number and the symbol of back service data transmission.Wherein, lead code takies an OFDM symbol, and owing to the needs of coding, the shared OFDM symbolic number of the business datum part in the agreement regulation descending sub frame must be 2 multiple, so the shared OFDM number of symbols of descending sub frame should be an odd number simultaneously; Same regulation, the shared OFDM symbolic number of the business datum in the sub-frame of uplink must be 3 multiple, and does not uply have the preamble symbol, so the shared OFDM symbol of sub-frame of uplink so long as 3 multiple get final product.Therefore, when considering the restriction of above-mentioned OFDM physical layer, the uplink and downlink OFDM number of symbols that equal conditions is determined is down slightly adjusted, it is satisfied: descending OFDM number of symbols is an odd number, and upgoing O FDM number of symbols is 3 multiple.
So to above-mentioned definite descending OFDM number of symbols 19, upgoing O FDM number of symbols 28 is adjusted, and obtains: the descending OFDM number of symbols of distribution is 17, and upgoing O FDM number of symbols is 30.
2) when network carry be the non-symmetrical service data time, general downlink business requires more bandwidth, as business, streaming media service etc. such as interactive entertainment business, network browsings.
If the uplink and downlink business datum amount ratio of A actual count is roughly 3: 2, the time ratio x that takies of descending sub frame and sub-frame of uplink then: y should satisfy x * 6 * 3/4: y * 4 * 3/4=3: 2 calculate and can get x: y=1: 1, again because effective totally 47 of OFDM symbols, and then know by inference:
The descending OFDM number of symbols that distributes is 24, and upgoing O FDM number of symbols is 23;
If consider the restriction of OFDM physical layer equally, omiting inching can get:
The descending OFDM number of symbols that distributes is 23, and upgoing O FDM number of symbols is 24.
If the uplink and downlink business datum amount ratio of B actual count is roughly 2: 1, the time ratio x that takies of descending sub frame and sub-frame of uplink then: y should satisfy x * 6 * 3/4: y * 4 * 3/4=2: 1 calculates and can get x: y=4: 3, again because effective totally 47 of OFDM symbols, and then know by inference:
The descending OFDM number of symbols that distributes is 27, and upgoing O FDM number of symbols is 20;
If consider the restriction of OFDM physical layer equally, omiting inching can get:
The descending OFDM number of symbols that distributes is 29, and upgoing O FDM number of symbols is 18.
If the uplink and downlink business datum amount ratio of C actual count is roughly 9: 4, the time ratio x that takies of descending sub frame and sub-frame of uplink then: y should satisfy x * 6 * 3/4: y * 4 * 3/4=9: 4 calculate and can get x: y=3: 2, again since effectively the OFDM symbol be 47, and then know by inference:
The descending OFDM number of symbols that distributes is 28, and upgoing O FDM number of symbols is 19;
If consider the restriction of OFDM physical layer equally, omiting inching can get:
The descending OFDM number of symbols that distributes is 29, and upgoing O FDM number of symbols is 18.
If the uplink and downlink business datum amount ratio of D actual count is roughly 3: 1, the time ratio x that takies of descending sub frame and sub-frame of uplink then: y should satisfy x * 6 * 3/4: y * 4 * 3/4=3: 1 calculates and can get x: y=2: 1, again since effectively the OFDM symbol be 47, and then know by inference:
The descending OFDM number of symbols that distributes is 32, and upgoing O FDM number of symbols is 15;
If consider the restriction of OFDM physical layer equally, omiting inching can get:
The descending OFDM number of symbols that distributes is 35, and upgoing O FDM number of symbols is 12.
It is noted that the OFDM number of symbols that carries in the radio frames is an integer, therefore in proportionate relationship and effective OFDM total number of symbols according to the uplink and downlink subframe, what get when calculating uplink and downlink OFDM number of symbols also is integer, is about value.
More than having introduced channel width is the multiple of 1.25MHz, and the instantiation of decimation factor n=28/25 is introduced the multiple that channel width is 1.75MHz, the instantiation of decimation factor n=8/7 below:
(2) channel width is the multiple of 1.75MHz, uses n=8/7, considers following typical bandwidth:
Table 2
| BW | 7 | MHz | 14 | MHz |
| Fs | 8 | MHz | 16 | MHz |
| Tb | 128 | us | 128 | us |
| Tg | 16 | us | 16 | us |
| Ts | 144 | us | 144 | us |
Can know from last table, an OFDM symbol lengths is 144us, therefore the radio frames of 5ms length comprises 34.7222 OFDM symbols, consider that the length of RTG and TTG probably is about 50us, so the OFDM symbol that comprise effective time in the radio frames of 5ms is 33.
1) when the business that network provides mainly be under the situation of symmetrical service, the time ratio x that descending sub frame and sub-frame of uplink take: y should satisfy x * 6 * 3/4: y * 4 * 3/4=1: 1 calculating can get x: y=2: 3, again because effective totally 33 of OFDM symbols, and then know by inference:
The descending OFDM number of symbols that distributes is 13, and upgoing O FDM number of symbols is 20;
If consider the restriction of OFDM physical layer equally, omiting inching can get:
The descending OFDM number of symbols that distributes is 15, and upgoing O FDM number of symbols is 18.
2) when network carry be the non-symmetrical service data time, general downlink business requires more bandwidth, as business, streaming media service etc. such as interactive entertainment business, network browsings.
If the uplink and downlink business datum amount ratio of A actual count is roughly 3: 2, the time ratio x that takies of descending sub frame and sub-frame of uplink then: y should satisfy x * 6 * 3/4: y * 4 * 3/4=3: 2 calculate and can get x: y=1: 1, again because effective totally 33 of OFDM symbols, and then know by inference:
The descending OFDM number of symbols that distributes is 17, and upgoing O FDM number of symbols is 16;
If consider the restriction of OFDM physical layer equally, omiting inching can get:
The descending OFDM number of symbols that distributes is 15, and upgoing O FDM number of symbols is 18.
If the uplink and downlink business datum amount ratio of B actual count is roughly 2: 1, the time ratio x that takies of descending sub frame and sub-frame of uplink then: y should satisfy x * 6 * 3/4: y * 4 * 3/4=2: 1 calculates and can get x: y=4: 3, again because effective totally 33 of OFDM symbols, and then know by inference:
The descending OFDM number of symbols that distributes is 19, and upgoing O FDM number of symbols is 14;
If consider the restriction of OFDM physical layer equally, omiting inching can get:
The descending OFDM number of symbols that distributes is 21, and upgoing O FDM number of symbols is 12.
If the uplink and downlink business datum amount ratio of C actual count is roughly 9: 4, the time ratio x that takies of descending sub frame and sub-frame of uplink then: y should satisfy x * 6 * 3/4: y * 4 * 3/4=9: 4 calculate and can get x: y=3: 2, again since effectively the OFDM symbol be 33, and then know by inference:
The descending OFDM number of symbols that distributes is 20, and upgoing O FDM number of symbols is 13;
If consider the restriction of OFDM physical layer equally, omiting inching can get:
The descending OFDM number of symbols that distributes is 21, and upgoing O FDM number of symbols is 12.
If the uplink and downlink business datum amount ratio of D actual count is roughly 3: 1, the time ratio x that takies of descending sub frame and sub-frame of uplink then: y should satisfy x * 6 * 3/4: y * 4 * 3/4=3: 1 calculates and can get x: y=2: 1, again since effectively the OFDM symbol be 33, and then know by inference:
The descending OFDM number of symbols that distributes is 22, and upgoing O FDM number of symbols is 11;
If consider the restriction of OFDM physical layer equally, omiting inching can get:
The descending OFDM number of symbols that distributes is 21, and upgoing O FDM number of symbols is 12.
More than having introduced channel width is the multiple of 1.25MHz, and channel width is the instantiation of the multiple of 1.75MHz, introduces the operable another one typical bandwidth of the WiMAX 8.75MHz of MTG regulation below.
(3) channel width is to be 8.75MHz, uses n=8/7:
Table 3
| BW | 8.75 | MHz |
| Fs | 10 | MHz |
| Tb | 102.4 | us |
| Tg | 12.8 | us |
| Ts | 115.2 | us |
Can know that from last table an OFDM symbol lengths is 115.2us, so the 5ms frame comprises 43.40278 OFDM symbols, consider that the length of RTG and TTG probably is about 50us, so the OFDM symbol that comprise effective time in the radio frames of 5ms is 42.That is to say that this 42 OFDM symbols are only is used to be distributed by up-downgoing.
1) when the business that network provides mainly be under the situation of symmetrical service, the time ratio x that descending sub frame and sub-frame of uplink take: y should satisfy x * 6 * 3/4: y * 4 * 3/4=1: 1 calculating can get x: y=2: 3, again because effective totally 42 of OFDM symbols, and then know by inference:
The descending OFDM number of symbols that distributes is 17, and upgoing O FDM number of symbols is 25;
If consider the restriction of OFDM physical layer equally, omiting inching can get:
The descending OFDM number of symbols that distributes is 15, and upgoing O FDM number of symbols is 27.
2) when network carry be the non-symmetrical service data time, general downlink business requires more bandwidth, as business, streaming media service etc. such as interactive entertainment business, network browsings.
If the uplink and downlink business datum amount ratio of A actual count is roughly 3: 2, the time ratio x that takies of descending sub frame and sub-frame of uplink then: y should satisfy x * 6 * 3/4: y * 4 * 3/4=3: 2 calculate and can get x: y=1: 1, again because effective totally 42 of OFDM symbols, and then know by inference:
The descending OFDM number of symbols that distributes is 21, and upgoing O FDM number of symbols is 21;
If consider the restriction of OFDM physical layer equally, above-mentioned concrete number also meets the demands just:
The descending OFDM number of symbols that distributes is 21, and upgoing O FDM number of symbols is 21.
If the uplink and downlink business datum amount ratio of B actual count is roughly 2: 1, the time ratio x that takies of descending sub frame and sub-frame of uplink then: y should satisfy x * 6 * 3/4: y * 4 * 3/4=2: 1 calculates and can get x: y=4: 3, again because effective totally 42 of OFDM symbols, and then know by inference:
The descending OFDM number of symbols that distributes is 24, and upgoing O FDM number of symbols is 18;
If consider the restriction of OFDM physical layer equally, omiting inching can get:
The descending OFDM number of symbols that distributes is 27, and upgoing O FDM number of symbols is 15.
If the uplink and downlink business datum amount ratio of C actual count is roughly 9: 4, the time ratio x that takies of descending sub frame and sub-frame of uplink then: y should satisfy x * 6 * 3/4: y * 4 * 3/4=9: 4 calculate and can get x: y=3: 2, again since effectively the OFDM symbol be 42, and then know by inference:
The descending OFDM number of symbols that distributes is 25, and upgoing O FDM number of symbols is 17;
If consider the restriction of OFDM physical layer equally, omiting inching can get:
The descending OFDM number of symbols that distributes is 27, and upgoing O FDM number of symbols is 15.
If the uplink and downlink business datum amount ratio of D actual count is roughly 3: 1, the time ratio x that takies of descending sub frame and sub-frame of uplink then: y should satisfy x * 6 * 3/4: y * 4 * 3/4=3: 1 calculates and can get x: y=2: 1, again since effectively the OFDM symbol be 42, and then know by inference:
The descending OFDM number of symbols that distributes is 28, and upgoing O FDM number of symbols is 14;
If consider the restriction of OFDM physical layer equally, omiting inching can get:
The descending OFDM number of symbols that distributes is 27, and upgoing O FDM number of symbols is 15.
Step 340: according to described uplink and downlink OFDM number of symbols, service data transmission in the uplink and downlink OFDM symbol of wireless sub-frame carrying.
Though the foregoing description has only been enumerated the situation of downlink service data amount greater than the uplink business data amount, for the situation of uplink business data amount greater than the downlink service data amount, the present invention program is suitable for too.
See also Fig. 4, it is a kind of business data transmission device structural representation based on orthogonal frequency division multiplexi disclosed by the invention.
Described business data transmission device comprises traffic volume measurement unit 41, ratio determining unit 42, number determining unit 43 and transmission unit 44.Preferably, also comprise adjustment unit 45.Wherein said ratio determining unit 42 comprises that first determines the subelement 421 and second determining unit 422.Operation principle below in conjunction with this device is specifically introduced its structure.
At first, operator adds up the uplink and downlink business datum amount in the practical application by traffic volume measurement unit 41, and then knows the general proportions relation of the business datum amount of the business datum amount of uplink and downlink transfer.
Then, ratio determining unit 42 according to the statistics of traffic volume measurement unit 41 outputs and the code modulation mode of uplink and downlink channel use, is identified for transmitting the ratio of uplink and downlink business datum subframe in radio frames.Particularly be exactly the code modulation mode of first definite subelement 421, determine the uplink and downlink subframe because the intrinsic unit throughput ratio that channel self code modulation mode causes according to the use of uplink and downlink channel; And then second determine intrinsic unit throughput ratio and the described uplink and downlink business datum amount statistics of subelement 422 according to described uplink and downlink subframe, determines the ratio of transmission uplink and downlink business datum subframe in the radio frames.
Again, number determining unit 43 according to effective OFDM total number of symbols of described uplink and downlink wireless sub-frame ratio and radio frames carrying, is determined uplink and downlink OFDM number of symbols.In addition, consider the restriction of OFDM physical layer if desired, then adjust according to 45 pairs of definite uplink and downlink OFDM numbers of symbols of adjustment unit again.
At last, by transmission unit according to described uplink and downlink OFDM number of symbols, service data transmission in the uplink and downlink OFDM symbol of wireless sub-frame carrying.
More vivid in order to understand, please referring to an instantiation.For example suppose that operator provides the non-symmetrical service data by the statistics that traffic volume measurement unit 41 obtains at present for network, and the downlink service data amount is greater than the uplink business data amount, both general proportions are 2: 1.In addition, the coded system that up channel is selected for use is QAM16-3/4, the coded system QAM64-3/4 that down channel is selected for use, and then by the single 421 yuan of intrinsic unit throughput ratios that obtain the uplink and downlink subframe of first definite son
Descending: up=6 * 3/4: 4 * 3/4=3/2;
The size that is used to transmit the uplink business data amount in radio frames, on the one hand and time of taking of sub-frame of uplink be directly proportional, channel self throughput that causes with the coded system of up channel employing is directly proportional on the other hand; In like manner, the size of transmission downlink service data amount, on the one hand and time of taking of descending sub frame be directly proportional, channel self throughput that causes with the coded system of down channel employing is directly proportional on the other hand.
According to above-mentioned theory, second determines that subelement 422 can be according to described descending and up intrinsic unit throughput ratio 3: 2 and descending and uplink business data amount ratio 2: 1, and the subframe ratio of determining to be used in the radio frames to transmit the uplink and downlink business datum is 4: 3.
Suppose that present channel width is 1.75MHz, decimation factor is 8/7, and then referring to table 2, effectively the OFDM total number of symbols is 33 as can be known, and concrete calculating done detailed description at preamble, repeated no more herein.Further, number determining unit 43 determines that according to the subframe ratio that is used to transmit the uplink and downlink business datum in effectively OFDM total number of symbols 33 and the described radio frames 4: 3 uplink and downlink OFDM number of symbols is respectively 14 and 19.
If consider the restriction of OFDM physical layer, be that descending OFDM number of symbols should be odd number, upgoing O FDM number of symbols should be 3 multiple, then by the restriction of adjustment unit 45 according to the OFDM physical layer, uplink and downlink OFDM number of symbols is omited inching: descending OFDM number of symbols is adjusted into 21 by 19, and upgoing O FDM number of symbols is adjusted into 12 by 14.As can be seen, descending OFDM number of symbols 21 is odd numbers, and upgoing O FDM number of symbols 12 is multiples of 3, promptly satisfies the restrictive condition of OFDM physical layer.
More than a kind of service data transmission method provided by the present invention and device are described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (14)
1, a kind of service data transmission method is characterized in that:
Uplink and downlink business datum amount is added up;
According to the code modulation mode of described statistics and the use of uplink and downlink channel, determine to be used in the radio frames transmit the ratio of uplink and downlink business datum subframe;
According to described ratio, service data transmission in the uplink and downlink wireless sub-frame.
2, service data transmission method as claimed in claim 1 is characterized in that:
According to the code modulation mode that the uplink and downlink channel uses, calculate the intrinsic unit throughput ratio of uplink and downlink subframe;
According to the intrinsic unit throughput ratio and the described uplink and downlink business datum amount statistics of described uplink and downlink subframe, determine to be used in the radio frames transmit the ratio of uplink and downlink business datum subframe.
3, service data transmission method as claimed in claim 1 or 2 is characterized in that: the coded system of using when described up channel is QAM16-3/4, and the code modulation mode that down channel uses is during as QAM64-3/4,
If uplink and downlink business datum amount statistics is roughly 1: 1, the ratio of then described uplink and downlink subframe is 2: 3; If uplink and downlink business datum amount statistics is roughly 3: 2, the ratio of then described uplink and downlink subframe is 1: 1; If uplink and downlink business datum amount statistics is roughly 2: 1, then the ratio of uplink and downlink subframe is 4: 3; If uplink and downlink business datum amount statistics is roughly 9: 4, the ratio of then described uplink and downlink subframe is 3: 2; If uplink and downlink business datum amount statistics is roughly 3: 1, the ratio of then described uplink and downlink subframe is 2: 1.
4, a kind of business data transmission device is characterized in that comprising:
The traffic volume measurement unit is used for uplink and downlink business datum amount is added up;
Determining unit is used for the code modulation mode according to described statistics and the use of uplink and downlink channel, determines to be used in the radio frames transmit the ratio of uplink and downlink business datum subframe;
Transmission unit is used for according to described ratio service data transmission in the uplink and downlink wireless sub-frame.
5, business data transmission device as claimed in claim 4 is characterized in that, described determining unit comprises:
First determines subelement, is used for the code modulation mode according to the use of uplink and downlink channel, determines the intrinsic unit throughput ratio of uplink and downlink subframe;
Second determines subelement, is used for intrinsic unit throughput ratio and described uplink and downlink business datum amount statistics according to described uplink and downlink subframe, determines to be used in the radio frames transmit the ratio of uplink and downlink business datum subframe.
6, a kind of service data transmission method based on orthogonal frequency division multiplexi is characterized in that:
Uplink and downlink business datum amount is added up;
According to the code modulation mode of described statistics and the use of uplink and downlink channel, determine to be used in the radio frames transmit the ratio of uplink and downlink business datum subframe;
According to effective frequency division multiplex OFDM total number of symbols of described uplink and downlink subframe ratio and radio frames carrying, determine the OFDM number of symbols in the uplink and downlink subframe;
According to OFDM number of symbols in the described uplink and downlink subframe, service data transmission in the uplink and downlink OFDM symbol of wireless sub-frame carrying.
7, the service data transmission method based on orthogonal frequency division multiplexi as claimed in claim 6 is characterized in that:
According to the code modulation mode that the uplink and downlink channel uses, calculate the intrinsic unit throughput ratio of uplink and downlink subframe;
According to the intrinsic unit throughput ratio and the described uplink and downlink business datum amount statistics of described uplink and downlink subframe, determine to be used in the radio frames transmit the ratio of uplink and downlink business datum subframe.
8, as claim 6 or 7 described service data transmission methods, it is characterized in that also comprising:, adjust uplink and downlink OFDM number of symbols according to the restriction of OFDMA physical layer based on orthogonal frequency division multiplexi.
9, the service data transmission method based on orthogonal frequency division multiplexi as claimed in claim 8 is characterized in that: in radio frames length is under the 5ms situation, when channel width is the integral multiple of 1.25MHz,
Described descending OFDM number of symbols is 17, and upgoing O FDM number of symbols is 30; Or described descending OFDM number of symbols is 23, and upgoing O FDM number of symbols is 24; Or described descending OFDM number of symbols is 29, and upgoing O FDM number of symbols is 18; Or described descending OFDM number of symbols is 35, and upgoing O FDM number of symbols is 12.
10, the service data transmission method based on orthogonal frequency division multiplexi as claimed in claim 8 is characterized in that: in radio frames length is under the 5ms situation, when channel width is the integral multiple of 1.75MHz,
Described descending OFDM number of symbols is 15, and upgoing O FDM number of symbols is 18; Or described descending OFDM number of symbols is 21, and upgoing O FDM number of symbols is 12.
11, the service data transmission method based on orthogonal frequency division multiplexi as claimed in claim 8 is characterized in that: in radio frames length is under the 5ms situation, when channel width is the integral multiple of 8.75MHz,
Described descending OFDM number of symbols is 15, and upgoing O FDM number of symbols is 27; Or described descending OFDM number of symbols is 21, and upgoing O FDM number of symbols is 21; Or described descending OFDM number of symbols is 27, and upgoing O FDM number of symbols is 15.
12, a kind of business data transmission device based on orthogonal frequency division multiplexi is characterized in that comprising:
The traffic volume measurement unit is used for uplink and downlink business datum amount and adds up;
The ratio determining unit is used for the code modulation mode according to described statistics and the use of uplink and downlink channel, is identified for transmitting the ratio of uplink and downlink business datum subframe in radio frames;
The number determining unit is used for the effective OFDM total number of symbols according to described uplink and downlink subframe ratio and radio frames carrying, determines uplink and downlink OFDM number of symbols;
Transmission unit is used for according to described uplink and downlink OFDM number of symbols, service data transmission in the uplink and downlink OFDM symbol of wireless sub-frame carrying.
13, the business data transmission device based on orthogonal frequency division multiplexi as claimed in claim 12 is characterized in that also comprising:
Adjustment unit is used for the restriction according to the OFDM physical layer, adjusts OFDM number of symbols in the uplink and downlink.
14, as the business data transmission device based on orthogonal frequency division multiplexi under claim 12 or 13, it is characterized in that: described ratio determining unit comprises
First determining unit is used for the code modulation mode according to the use of uplink and downlink channel, determines the intrinsic unit throughput ratio of uplink and downlink subframe;
Second determining unit is used for intrinsic unit throughput ratio and described uplink and downlink data business volume statistics according to described uplink and downlink subframe, is identified for transmitting the ratio of uplink and downlink business datum subframe in radio frames.
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