CN107659343B - Millimeter wave cooperative transmission method and device - Google Patents
Millimeter wave cooperative transmission method and device Download PDFInfo
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- CN107659343B CN107659343B CN201710894275.8A CN201710894275A CN107659343B CN 107659343 B CN107659343 B CN 107659343B CN 201710894275 A CN201710894275 A CN 201710894275A CN 107659343 B CN107659343 B CN 107659343B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0426—Power distribution
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
A millimeter wave cooperative transmission device and method, collect the real-time emission status information of one or more low frequency ranges from the baseband signal processing equipment of the low frequency range at first, then withdraw the time label of the low frequency range signal from the real-time emission status information, and obtain the non-ideal factor, calculate the guard interval synthetically; generating corresponding transmitting interval information under different modes according to the transmission mode of the guard interval and the low frequency band, adding the guard interval between the transmitting interval information and the low frequency band, generating a millimeter wave signal optimal transmitting interval, and outputting the millimeter wave signal optimal transmitting interval through baseband processing equipment of the high frequency band millimeter wave signal; the real-time transmission state information comprises: low frequency band transmission mode and time tag. According to the invention, before millimeter wave communication is transmitted, the transmission mode and the time tag of low-frequency communication are obtained in advance, and the transmitting window of millimeter wave communication is configured through the station according to the information, so that the transmitting efficiency is improved as much as possible under the condition of not violating the total power limit.
Description
Technical Field
The invention relates to a technology in the field of wireless transmission, in particular to a millimeter wave cooperative transmission device and a millimeter wave cooperative transmission method which can be used in various multi-band signal transmission sites with limited total power, including but not limited to multi-band cellular networks, wireless local area (Wi-Fi) networks, various heterogeneous networks formed by cellular networks and wireless local area networks and other scenes.
Background
For the fifth generation mobile communication system, since the site resources of the mobile communication network are very limited, low frequency band (<6GHz) communication for network coverage performance and high frequency band millimeter wave communication for increasing the transmission rate are often deployed on the same site, so as to save the site resources. However, the total power that each station can transmit radio wave signals is often limited. On the premise of lacking coordination of low-frequency-band traditional cellular communication and high-frequency-band millimeter wave communication, independent wireless signal transmission often breaks through the limit of total power, so that corresponding radio management regulations are violated. In the prior art, the time-sharing switching is adjusted and optimized through various means, but the data volume of the calculation processing of the whole system including the terminal is greatly increased, and extra calculation resources are occupied.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a millimeter wave cooperative transmission device and a millimeter wave cooperative transmission method.
The invention is realized by the following technical scheme:
the invention relates to a millimeter wave cooperative transmission method, which comprises the steps of firstly collecting real-time transmission state information of one or more low frequency bands from baseband signal processing equipment of the low frequency band, then extracting a time tag of a low frequency band signal from the real-time transmission state information, acquiring non-ideal factors, and comprehensively calculating a protection interval; and generating corresponding transmitting interval information under different modes according to the guard interval and the transmission mode of the low frequency band, adding the guard interval therebetween, generating a millimeter wave signal optimal transmitting interval, and outputting the millimeter wave signal optimal transmitting interval through baseband processing equipment of the high frequency band millimeter wave signal.
The real-time transmission state information comprises: low frequency band transmission mode and time tag.
The non-ideal factors include: high band baseband signal processing speed and radio frequency delay uncertainty.
The transmission modes include but are not limited to: in a TDD (Time division duplex) mode, the ratio of uplink and downlink transmission frames and the specific position of a downlink subframe; in an FDD (Frequency division multiplexing) mode, the service conditions of each downlink carrier include downlink discontinuous transmission, carrier aggregation and the like; and under the condition of low load of the carrier, carrying out information related to downlink signal transmission, such as the turn-off conditions of a time slot level, a subframe level and a longer period.
The guard interval is set in the following way: is ═ iacc+pro+delayWherein:accthe uncertainty that results from the lack of precision of the time tag,profor low and high frequency baseband signal processing at different speedsThe degree of uncertainty that is brought about,delayuncertainty in delay for low and high frequency radio frequency processing.
The millimeter wave signals are preferably transmitted in the transmission interval, that is, after the signal transmission control unit acquires the transmission mode and the time tag of the low frequency band from the transmission information acquisition unit and acquires the size of the guard interval from the guard interval control unit, the signal transmission control unit generates transmission interval information of the high frequency band millimeter wave signals according to different transmission modes and different guard interval sizes and aligns the time tags of the low frequency band millimeter wave signals and the high frequency band millimeter wave signals.
Drawings
FIG. 1 is a schematic diagram of power-limited millimeter wave cooperative transmission;
FIG. 2 is a system diagram according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating subframe matching and transmission interval information generation in the LTE TDD system mode "0" in the embodiment;
fig. 4 is a schematic diagram illustrating transmission interval information generation in an LTE FDD system according to an embodiment;
FIG. 5 is a schematic flow chart of the method;
FIG. 6 is a diagram showing the probability of site violating the total power limit versus the probability of millimeter wave random transmission in an embodiment;
FIG. 7 is a diagram showing the relationship between the millimeter wave transmission probability and the discontinuous mode and carrier aggregation in the embodiment;
fig. 8 is a schematic diagram of signal transmission in a low band TDD system, mode "0" transmission, without carrier turn-off;
fig. 9 is a schematic diagram of signal transmission of a low-frequency band FDD system, discontinuous transmission and carrier aggregation, and no carrier shutdown.
Detailed Description
As shown in fig. 2, the present embodiment includes: a transmission information acquisition unit, a guard interval control unit and a signal transmission control unit deployed at a base station side of a mobile communication network, wherein: the transmission information acquisition unit acquires real-time transmission state information of a low frequency band from baseband signal processing equipment of the low frequency band, the guard interval control unit analyzes the real-time transmission state information to obtain a time tag for low frequency band signal transmission, a guard interval is set by combining the time tag, the processing speed of a high frequency band baseband signal and radio frequency delay uncertainty, and the signal transmission control unit sets a millimeter wave signal optimal transmission interval according to the real-time transmission state information, the guard interval and the time tag and outputs the millimeter wave signal optimal transmission interval to the baseband signal processing equipment of a millimeter wave band, so that real-time cooperative transmission of the low frequency band and the high frequency band is realized.
The baseband signal processing device includes but is not limited to: a device for processing baseband signals for cellular communications (GSM/CDMA/LTE), WiFi communications, and the like, generally includes a channel coding/decoding module, a modulation/demodulation module, a frame structure mapping module, a clock synchronization module, and the like. Typical models may include high-traffic X5, X7, X8, X10, X12 series LTE baseband, Intel's XMM 7480 model LTE baseband, blong's series baseband, wary.
The real-time transmission state information comprises: a low frequency band transmission method and a time tag, wherein the transmission method includes but is not limited to: in a TDD (Time division duplex) mode, the ratio of uplink and downlink transmission frames and the specific position of a downlink subframe; in an FDD (Frequency division multiplexing) mode, the service conditions of each downlink carrier include downlink discontinuous transmission, carrier aggregation and the like; and under the condition of low load of the carrier, carrying out information related to downlink signal transmission, such as the turn-off conditions of a time slot level, a subframe level and a longer period.
The specific generation method of the preferable millimeter wave signal emission interval comprises the following steps: 1) in the TDD mode, different uplink and downlink proportions are needed; 2) in the FDD mode, information such as downlink discontinuous transmission, carrier aggregation and the like is required; 3) under the condition of carrier cut-off (including TDD and FDD modes), combining the intervals of carrier cut-off and the transmission intervals determined in 1) and 2) to obtain updated transmission interval information; 4) and inserting a guard interval, namely increasing the guard interval at the beginning and the end of the transmission interval so as to ensure that the transmission interval can work normally under the condition of insufficient time precision.
1) In the TDD mode, transmission interval information needs to be generated according to different uplink and downlink ratios. Taking LTE TDD system subframe configuration mode "0" as an example, the configuration situation of uplink and downlink subframes is shown in fig. 3, and correspondingly, the transmission interval is mainly an uplink transmission interval (i.e. the case where the terminal transmits a signal and the base station does not transmit a signal to the outside).
2) In the FDD mode, transmission interval information needs to be generated according to information such as downlink discontinuous transmission, carrier aggregation and the like. As shown in fig. 4, for the case of carrier aggregation, the secondary carrier is in a non-transmission state in the period of non-carrier aggregation transmission, and thus a high-band millimeter wave signal can be allowed to be transmitted. In addition, when the main carrier/the auxiliary carrier is in a discontinuous transmission state, a certain time period is available for not transmitting signals outside, and the time period can also be used as a transmission interval of the high-frequency-band millimeter wave signals.
3) And under the condition that the carrier is switched off (including TDD and FDD modes), combining the transmission intervals determined in the intervals of switching off the carrier and 1) and 2) to obtain updated transmission interval information.
4) And inserting a guard interval, namely increasing the guard interval at the beginning and the end of the transmission interval so as to ensure that the transmission interval can work normally under the condition of insufficient time precision.
As shown in fig. 1 and 5, the present embodiment relates to a millimeter wave cooperative transmission method of the above system, including the following steps:
step 1: the transmission information acquisition unit acquires real-time transmission state information of one or more low frequency bands from the baseband signal processing equipment of the low frequency band.
In the method, the real-time transmission state information preferably includes information such as different transmission modes (corresponding to different uplink and downlink subframe ratios) in the TDD system, a non-continuous transmission state and a transmission state of carrier aggregation in the FDD system, whether a carrier turn-off mode is enabled, and a time tag of a low-frequency band signal.
Step 2: and the guard interval control unit extracts the time tag of the low-frequency-band signal from the real-time transmission state information and acquires non-ideal factors.
The non-ideal factors can be obtained by testing before the factory shipment of the base station device, and include but are not limited to: high-band baseband signal processing speed, radio frequency delay uncertainty, and the like.
And step 3: the guard interval control unit analyzes the precision of the low-frequency-band signal time tag, and calculates the guard interval by combining various non-ideal factors such as the processing speed of the high-frequency-band baseband signal and the uncertainty of the radio frequency delay, namely: is ═ iacc+pro+delay。
Preferably, the uncertainty caused by the insufficient precision of the time tag comprises an upper limit of the time uncertainty obtained by directly adding different precision and non-ideal factors.
And 4, step 4: the signal transmission control unit acquires the guard interval from the guard interval control unit and acquires the transmission mode of the low frequency band from the transmission information acquisition unit.
And 5: the signal transmission control unit generates transmission interval information of the high-frequency band signal according to the guard interval and the transmission mode of the low-frequency band, and executes any one of the steps 5.1 to 5.3 and the step 5.4 respectively.
Step 5.1: and generating transmission interval information in a TDD mode: the signal emission control unit judges whether the low-frequency band transmission mode contains an indication signal of a TDD mode. And under the condition of containing the TDD mode indication signal, extracting the indication information of the transmission mode, analyzing the proportioning condition of the uplink subframe and the downlink subframe, and configuring the subframe for uplink transmission into a high-frequency millimeter wave transmitting interval.
Step 5.2: and generating transmission interval information in an FDD mode: the signal emission control unit judges whether the transmission mode of the low frequency band contains the indication signal of the FDD mode. And under the condition of containing the FDD mode indication signal, judging whether indication information of discontinuous transmission is contained, and configuring a non-transmission area as a transmission interval of the high-frequency millimeter wave. And under the condition of containing the FDD mode indication signal and the carrier aggregation indication signal, judging whether the auxiliary carrier is in a transmitting state, and configuring a non-transmitting interval of the auxiliary carrier into a transmitting interval of high-frequency-band millimeter waves.
Step 5.3: generating transmission interval information in a carrier off mode: the signal transmission control unit judges whether the signal of the low frequency band is in a carrier off mode. For the case of being in the carrier-off mode, the interval in which the carrier is off is configured as the transmission interval of the high-band millimeter waves.
Step 5.4: and analyzing the transmission interval information, adding a guard interval according to the size of the guard interval control unit at the starting time point and the ending time point of each section of continuous transmission interval, and finally generating the transmission interval information of the high-frequency-band millimeter waves.
Step 6: and the baseband processing unit of the high-frequency-band millimeter wave signals transmits the high-frequency-band millimeter wave signals according to the high-frequency-band millimeter wave transmitting interval information generated by the signal transmitting control unit.
The method has the technical effects that:
1) the total power limit of the station transmitted signals is strictly adhered to. Because the millimeter wave is transmitted only in the time interval allowing transmission, the power of the whole base station transmission signal is controlled within the specified limit range, thereby strictly complying with the relevant radio power management regulation. For convenience of illustration, taking LTE TDD system subframe configuration mode "0" as an example, it is assumed that the transmission power of the LTE signal is 20W, the transmission power of the millimeter wave is 20W, and the transmission power of the base station is limited to 20W. If the millimeter wave signal transmits no signal with random probability P in 50% of the time of the uplink sub-frame and the special sub-frame, the probability of violating the total power limit of the station is shown in fig. 7. It can be seen from the figure that if the millimeter waves are transmitted with random probability, the probability exceeds the power limit, and the invention successfully solves the problem.
2) The transmission probability of the millimeter wave communication signal is increased. Under the condition of ensuring that the limitation of the total transmission power is obeyed, the invention can effectively increase the transmission probability of millimeter wave signals. For convenience of explanation, the LTE FDD system will be described. The high-frequency millimeter wave signal can be transmitted in both cases of discontinuous transmission and non-carrier aggregation, and assuming that the probability of discontinuous transmission in the FDD system is P1 and the probability of non-carrier aggregation is P2, and let P1 be P2 be α, then the transmission probability of the high-frequency millimeter wave is as shown in fig. 7. According to images, the millimeter wave emission probability can be improved by changing the probability of discontinuous mode and carrier aggregation in the LTE FDD mode.
3) The system complexity is low. The method is characterized by comprising the following three aspects: i) the method only needs to perform hardware deployment and software upgrading on the base station side, does not need to perform updating and upgrading on the user equipment side, and has low deployment cost and good user equipment compatibility. ii) the invention does not need to make improvement on the baseband design, and saves the extra expense of upgrading the base station. And iii) when the base station side sends the millimeter wave signal, only the transmission information of the low-frequency LTE signal needs to be acquired, and the real-time calculation is not involved.
4) The application range is wide. The technology of the invention is a supplement to the prior art, can be applied to the existing numerous LTETDD or LTE FDD base stations, and has larger market promotion potential.
The foregoing embodiments may be modified in many different ways by those skilled in the art without departing from the spirit and scope of the invention, which is defined by the appended claims and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (8)
1. A millimeter wave cooperative transmission method is characterized in that real-time transmission state information of one or more low frequency bands is collected from a baseband signal processing device of the low frequency band, then a time tag of a low frequency band signal is extracted from the real-time transmission state information, non-ideal factors are obtained, and a guard interval is comprehensively calculated; generating corresponding transmitting interval information under different modes according to the transmission mode of the guard interval and the low frequency band, adding the guard interval between the transmitting interval information and the low frequency band, generating a millimeter wave signal optimal transmitting interval, and outputting the millimeter wave signal optimal transmitting interval through baseband processing equipment of the high frequency band millimeter wave signal; the real-time transmission state information comprises: a low frequency band transmission mode and a time tag;
the guard interval ═acc+pro+delayWherein:accthe uncertainty that results from the lack of precision of the time tag,prouncertainty due to difference in processing speed between low-frequency and high-frequency baseband signals，delayUncertainty in delay for low and high frequency radio frequency processing.
2. The method of claim 1, wherein the transmission mode comprises: TDD mode, FDD mode and carrier at low load.
3. The method of claim 1, wherein the real-time transmission status information includes different uplink and downlink subframe ratios in a TDD system, a discontinuous transmission status and a carrier aggregation transmission status in an FDD system, whether a carrier off mode is enabled, and a time stamp of a low frequency band signal.
4. The method as claimed in claim 1, wherein the millimeter wave signal is preferably transmitted in a transmission interval, that is, the signal transmission control unit obtains the transmission mode and time stamp of the low frequency band from the transmission information obtaining unit, obtains the guard interval size from the guard interval control unit, generates the transmission interval information of the high frequency band millimeter wave signal according to different transmission modes and guard interval sizes, and aligns the time stamps of the low frequency band millimeter wave signal and the high frequency band millimeter wave signal.
5. The method as claimed in claim 1 or 4, wherein the specific generation method of the preferable transmission interval of the millimeter wave signal comprises:
1) in a TDD mode, generating transmission interval information according to different uplink and downlink proportions, wherein the transmission interval is uplink transmission, namely an interval under the condition that a terminal transmits signals and a base station does not transmit signals outwards;
2) in the FDD mode, generating transmission interval information according to downlink discontinuous transmission and carrier aggregation: for the case of carrier aggregation, the secondary carrier is in a non-transmitting state in a non-carrier aggregation transmitting time period, so that a high-frequency-band millimeter wave signal is allowed to be transmitted;
3) under the condition of carrier cut-off, combining the interval of carrier cut-off and the transmitting interval determined in 1) and 2) to obtain updated transmitting interval information;
4) and inserting a guard interval, namely increasing the guard interval at the beginning and the end of the transmission interval so as to ensure that the transmission interval can work normally under the condition of insufficient time precision.
6. The method as claimed in claim 5, wherein in the FDD mode, the non-external signal transmission period when the primary carrier/secondary carrier is in the discontinuous transmission state is used as the transmission interval of the high frequency band millimeter wave signal.
7. The method of claim 1, wherein the one or more low frequency bands comprise acquiring a plurality of contiguous frequency bands or acquiring transmission modes and time stamps over a plurality of discrete frequency bands.
8. A millimeter wave cooperative transmission system, comprising: a transmission information acquisition unit, a guard interval control unit and a signal transmission control unit deployed at a base station side of a mobile communication network, wherein: the transmission information acquisition unit acquires real-time transmission state information of a low frequency band from baseband signal processing equipment of the low frequency band, the guard interval control unit analyzes the real-time transmission state information to obtain a time tag for low frequency band signal transmission, a guard interval is set by combining the time tag, the processing speed of a high frequency band baseband signal and radio frequency delay uncertainty, and the signal transmission control unit sets a millimeter wave signal optimal transmission interval according to the real-time transmission state information, the guard interval and the time tag and outputs the millimeter wave signal optimal transmission interval to the baseband signal processing equipment of a millimeter wave band, so that real-time cooperative transmission of the low frequency band and the high frequency band is realized.
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| CN108768592B (en) * | 2018-05-30 | 2021-07-06 | 南方科技大学 | Millimeter wave and lower frequency wireless communication joint transmission method and device |
| CN111480374B (en) * | 2018-10-17 | 2022-01-11 | Oppo广东移动通信有限公司 | Data packet transmission method and device |
| CN113890597B (en) * | 2021-11-08 | 2022-05-31 | 西南交通大学 | High-low frequency assisted unmanned aerial vehicle network coverage enhancement method |
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| JP3989439B2 (en) * | 2001-11-28 | 2007-10-10 | 富士通株式会社 | Orthogonal frequency division multiplexing transmission method |
| CN101631316B (en) * | 2008-07-16 | 2011-07-06 | ***通信集团公司 | Method and equipment for improving frequency spectrum utilization rate in TDD system |
| EP2834935A1 (en) * | 2012-04-03 | 2015-02-11 | Nokia Solutions and Networks Oy | Frame format in communications |
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