CN100512254C - Method for transmitting real-time information between indoor unit and outdoor unit - Google Patents
Method for transmitting real-time information between indoor unit and outdoor unit Download PDFInfo
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- CN100512254C CN100512254C CNB2005101305313A CN200510130531A CN100512254C CN 100512254 C CN100512254 C CN 100512254C CN B2005101305313 A CNB2005101305313 A CN B2005101305313A CN 200510130531 A CN200510130531 A CN 200510130531A CN 100512254 C CN100512254 C CN 100512254C
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Abstract
The invention relates to a method for transmitting real-time information between indoor and outdoor units, which comprises: filling real-time information into the CP (circulatory prefix) of user data mark of indoor unit of OFDM (orthogonal frequency division multiplexing) system; said indoor unit sends said user data mark to the outdoor unit of OFDM system; the outdoor unit obtains said real-time information by said user data mark. With said invention, the demodulated code information of user data can be transmitted between indoor and outdoor units.
Description
Technical field
The present invention relates to communication field, relate in particular to a kind of method of between indoor unit and outdoor unit, transmitting real time information.Usually with baseband processing unit as outdoor unit, with RF processing unit as indoor unit,
Background technology
In the design process of modern base station, usually baseband processing unit and RF processing unit are separated in physics realization, baseband processing unit and RF processing unit are independent mutually, and the interface between them defines by standard agreement or manufacturer's custom protocol.
Existing above-mentioned standard agreement mainly comprises:
1, BOSAI (Open Base Station Architecture, Open Base Station Architecture) agreement.
2, CPRI (The Common Public Radio Interface, common radio-frequency interface) agreement.
Also all there is ripe custom protocol in each manufacturer, and interface support rack inside, the radio frequency of realizing according to this custom protocol separately zooms out and the application of cabinet.
In broadband access system, be included in 3G (Third Generation, 3G (Third Generation) Moblie) in the follow-up development, with REC (the Radio Equipment Control, the radio-frequency apparatus controller) as indoor unit, with RE (the Radio Equipment, radio-frequency apparatus) as outdoor unit, and between Base-Band Processing on the REC and the radio frequency processing on the RE, increased some coupled relations, so more contact has been arranged between REC and the RE.
Such as, in the 802.16d/e broadband access system, adopted multiple modulation system, and the EVM (Error Vector Magnitude, amplitude vector error) that this multiple modulation system requires is also inequality.As shown in table 1.
The relation table of table 1, modulation system and EVM:
| Modulation | Coding?Rate | EVM(％) |
| BPSK-1/2 | 1/2 | 22.4 |
| QPSK-1/2 | 1/2 | 15.9 |
| QPSK-3/4 | 3/4 | 11.9 |
| QAM16-1/2 | 1/2 | 8.4 |
| QAM16-3/4 | 3/4 | 5.6 |
| QAM64-2/3 | 2/3 | 3.8 |
| QAM64-3/4 | 3/4 | 2.8 |
In radio frequency part,, must carry out slicing and handle the peak-to-average ratio that suppresses signal in order to improve the efficient of power amplifier.And slicing effect that slicing is handled and the deterioration of EVM are relevant.If carry out slicing according to certain slicing effect merely, will cause the deterioration of EVM, thereby can not satisfy the requirement of different modulated signals; If carry out slicing according to a conservative EVM value merely, will cause the slicing dynamics not enough, the modulation signal that has also has very big surplus, and power amplifier improves DeGrain.Therefore, preferably can dispose different slicing parameters, to reach different slicing effects according to the different modulating mode of signal.
In the broadband access system of 802.16d/e, descending debug signal is according to different user's real-time change, and minimum change interval is 1 symbol symbol.Therefore, need between REC and RE, increase extra transmission channel, transmit this modulation coding information.
Along with the message transmission rate in the communication system is more and more higher, the transmission cycle of each code element is also shorter and shorter.Owing to there is multipath effect in wireless communication system, therefore, when symbol transmission period shortened, the intersymbol interference meeting was more serious, thereby caused detecting performance decrease.If in wireless communication system, introduce parallel transmission technology, then can transmit a plurality of code elements simultaneously, under the constant situation of overall data transmission rate, the transmission cycle of each code element is leap ahead greatly like this.
OFDM (orthogonal frequency division multiplexing, OFDM) technology can utilize the orthogonal sub-carriers group to realize parallel transmission.Ofdm system adopts extensive subcarrier and frequency overlap technology, adopts IFFT (inverse Fourier transform) and FFT (Fourier transform) to realize respectively at transmitting terminal and receiving terminal, thereby causes system's implementation complexity to reduce greatly.As shown in Figure 1, ofdm system is realized the process of multicarrier stack with IFFT at transmitting terminal.
In ofdm system, can eliminate multipath fully by CP (Cyclic Prefix) and disturb.As shown in Figure 2, CP be positioned at each useful user data symbol (symbol) foremost and rearmost end, constitute an OFDM symbol.The data that comprise among these two sections CP are the same, all are the last part data that comprise each useful user data symbol.Therefore, these two sections CP data repetition that is partial datas among the symbol.In the prior art CP normal handling flow process as shown in Figure 3, what comprise among the CP is information among the useful symbol, the real time information that needs to transmit between REC and RE is by other approach transmission.
A kind of method of transmitting above-mentioned modulation coding information is in the prior art: according to CPRI (common public radio interface, be a kind of interface standard between REC and the RE) transmission frame format of agreement, in the CPRI frame format, newer field is set, in the control of this newer field word (control word) part or IQData block (quadrature two paths of data district) part, carries the modulation coding information of the user data that needs transmission.The principle schematic of this method as shown in Figure 4.
The shortcoming of this method is: because the above-mentioned modulation coding information that need to transmit is real-time, bandwidth requirement is wide, and with IQ (quadrature two paths of signals) data of different rates difference.Therefore, this method is opened up one section space separately and is transmitted this modulation coding information in the CPRI frame, will bring very big difficulty to the design of CPRI frame structure.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the purpose of this invention is to provide a kind of method of between indoor unit and outdoor unit, transmitting real time information, thereby can be on the REC-RE of ofdm system interface, in real time, with the real time information such as modulation coding information of ground, road transmitting user data.
The objective of the invention is to be achieved through the following technical solutions:
A kind of method of transmitting real time information between indoor unit and outdoor unit comprises:
A, in the cyclic prefix CP of the user data symbol of the indoor unit of orthogonal frequency division multiplex OFDM system, fill real time information;
B, described indoor unit send to the outdoor unit of ofdm system with described user data symbol of having filled real time information, and outdoor unit obtains described real time information according to the user data symbol that receives.
Described real time information comprises the modulation coding information of user data symbol.
Described steps A specifically comprises:
In the CP of the user data symbol of the indoor unit of ofdm system, fill the modulation coding information of next user data symbol.
Described indoor unit comprises the radio-frequency apparatus controller.
Described step B specifically comprises:
Described outdoor unit has received filling that indoor unit sends after the user data symbol of real time information, in this user data symbol of normal process, obtains described real time information according to the CP of this user data symbol.
Described step B also comprises:
Described outdoor unit is according to the CP of the user data symbol that receives, obtain and preserve the modulation coding information of next user data symbol, after the next user data symbol that receives the indoor unit transmission, according to the described modulation coding information of preserving, this next one user data symbol is handled accordingly.
Described step B also comprises:
Described outdoor unit is given the different different slicing parameters of user data signal configuration according to the modulation coding information of the different user data symbol of preserving.
Described outdoor unit comprises radio-frequency apparatus.
As seen from the above technical solution provided by the invention, the present invention is filled among the CP by the real time information that will need to transmit, and is delivered to outdoor unit with CP.Can between the REC of ofdm system and RE, transmit real time information effectively, and the present invention do not lose the useful data of transmission, do not take system's extra bandwidth, do not bring and handle time-delay and treatment loss to ofdm system.
Description of drawings
Fig. 1 realizes the process schematic diagram of multicarrier stack with IFFT at transmitting terminal for ofdm system;
Fig. 2 is for being provided with the structural representation of the OFDM symbol of CP in the ofdm system;
Fig. 3 is a CP normal handling schematic flow sheet in the ofdm system of prior art;
Fig. 4 is a kind of schematic diagram that transmits the method for user data modulation coding information in the prior art;
Fig. 5 is the process chart of the specific implementation of the method for the invention;
Fig. 6 is the schematic diagram of filling the relevant information of next symbol in the method for the invention in CP;
After Fig. 7 receives the symbol that has filled the real time information of describing next symbol for the RE receiving terminal, the principle schematic of its processing procedure.
Embodiment
The invention provides a kind of method of between indoor unit and outdoor unit, transmitting real time information, core of the present invention is: the real time information that will need to transmit at the REC transmitting terminal is filled among the CP of symbol, the RE receiving terminal obtains real time information according to the CP of the symbol that receives, and handles accordingly.
Describe the method for the invention in detail below in conjunction with accompanying drawing, the handling process of the specific implementation of the method for the invention comprises the steps: as shown in Figure 5
Step 5-1, the real time information that will need to transmit at the REC transmitting terminal are filled among the CP of symbol, and this symbol is sent to the RE receiving terminal.
Can know that from the description of the symbol structure of the OFDM of front CP information is redundant in the symbol structure, and in each symbol, carry.So the present invention utilizes the shared bandwidth of this CP redundant information, between REC and RE, transmit some real-time information.
At first, the real time information that will need to transmit at the REC transmitting terminal is filled among the CP of symbol, and this real time information comprises regularly synchronizing information, describes the information such as information of symbol, and the information of describing symbol comprises the modulation coding informations such as modulation type of symbol.
If the real time information of filling is an information of describing symbol, then must fill the relevant information of describing next symbol, as shown in Figure 6 in CP.Why filling the relevant information of next symbol in CP, is in order to guarantee that the processing on the RE receiving terminal does not increase extra time delay.
Then, the REC transmitting terminal sends to the RE receiving terminal with this symbol that has filled real time information.
Step 5-2, RE receiving terminal obtain the real time information of filling according to the CP of the symbol that receives, and handle accordingly.
After the RE receiving terminal receives the described symbol that fills real time information that the REC transmitting terminal sends over, just the CP according to this symbol obtains the real time information that REC passes over, when carrying out normal data processing, can also handle accordingly according to the real time information that obtains.
If the real time information of filling in CP is an information of describing symbol, then as shown in Figure 7 in the principle of the processing procedure of RE receiving terminal.Concrete handling process is:
When the RE receiving terminal receives n symbol that the REC transmitting terminal sends over, obtain the CP information of this symbol, in the normal process data,, the relevant information of n+1 symbol filling in this CP information of obtaining is preserved according to time sequencing.
When the RE receiving terminal receives n+1 symbol that the REC transmitting terminal sends over,, this n+1 the symbol that receives handled accordingly according to the relevant information of n+1 symbol of above-mentioned preservation.Such as, can utilize the relevant information of n+1 symbol of preservation to replace counterpart among the CP of this n+1 symbol, and be the corresponding slicing parameter of this n+1 symbol signal configures.
The real time information of filling among the CP of this n+1 symbol is the real time information of REC being used for of sending n+2 symbol being handled, and after RE receives this real time information, handles accordingly according to above-mentioned handling process.
According to the handling process of the described method of the invention described above, can between REC and RE, transmit some real-time information effectively, this conveying flow does not have time delay and loss.Do not take system's extra bandwidth, to the processing of the data flow between existing REC and the RE without any influence.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (8)
1, a kind of method of transmitting real time information between indoor unit and outdoor unit is characterized in that, comprising:
A, in the cyclic prefix CP of the user data symbol of the indoor unit of orthogonal frequency division multiplex OFDM system, fill real time information;
B, described indoor unit send to the outdoor unit of ofdm system with described user data symbol of having filled real time information, and outdoor unit obtains described real time information according to the user data symbol that receives.
2, according to the described method of between indoor unit and outdoor unit, transmitting real time information of claim 1, it is characterized in that described real time information comprises the modulation coding information of user data symbol.
3, according to the described method of between indoor unit and outdoor unit, transmitting real time information of claim 2, it is characterized in that described steps A specifically comprises:
In the CP of the user data symbol of the indoor unit of ofdm system, fill the modulation coding information of next user data symbol.
4, according to the described method of between indoor unit and outdoor unit, transmitting real time information of claim 3, it is characterized in that described indoor unit comprises the radio-frequency apparatus controller.
5, according to claim 3 or the 4 described methods of between indoor unit and outdoor unit, transmitting real time information, it is characterized in that described step B specifically comprises:
Described outdoor unit has received filling that indoor unit sends after the user data symbol of real time information, in this user data symbol of normal process, obtains described real time information according to the CP of this user data symbol.
6, according to the described method of between indoor unit and outdoor unit, transmitting real time information of claim 5, it is characterized in that described step B also comprises:
Described outdoor unit is according to the CP of the user data symbol that receives, obtain and preserve the modulation coding information of next user data symbol, after the next user data symbol that receives the indoor unit transmission, according to the described modulation coding information of preserving, this next one user data symbol is handled accordingly.
7, according to the described method of between indoor unit and outdoor unit, transmitting real time information of claim 6, it is characterized in that described step B also comprises:
Described outdoor unit is given the different different slicing parameters of user data signal configuration according to the modulation coding information of the different user data symbol of preserving.
8, according to the described method of between indoor unit and outdoor unit, transmitting real time information of claim 7, it is characterized in that described outdoor unit comprises radio-frequency apparatus.
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| CNB2005101305313A CN100512254C (en) | 2005-12-14 | 2005-12-14 | Method for transmitting real-time information between indoor unit and outdoor unit |
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| CNB2005101305313A CN100512254C (en) | 2005-12-14 | 2005-12-14 | Method for transmitting real-time information between indoor unit and outdoor unit |
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| CN100512254C true CN100512254C (en) | 2009-07-08 |
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| CN100461107C (en) * | 2007-03-30 | 2009-02-11 | 上海杰盛无线通讯设备有限公司 | Renew method for microwave remote outdoor unit software |
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Non-Patent Citations (2)
| Title |
|---|
| 循环前缀在OFDM系统中的应用. 李郜伟，曹增峰，张海林.电讯技术，第1期. 2003 |
| 循环前缀在OFDM系统中的应用. 李郜伟，曹增峰，张海林.电讯技术，第1期. 2003 * |
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