CN103701737B - Interference cancellation method for communication of cloud wireless access network - Google Patents
Interference cancellation method for communication of cloud wireless access network Download PDFInfo
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Abstract
The invention relates to an interference cancellation method for communication of a cloud wireless access network. The interference cancellation method comprises cancellation of interference of a macro-base station and interference of a micro-base station, is based on a novel frame structure and specifically comprises the following steps: sending a pilot frequency signal by the macro/micro-base station in a T1 downlink time slot and estimating channel state information of a downlink by a macro/micro-cell user by utilizing the received pilot frequency signal; feeding the channel state information of a macro/micro-cell uplink back to the macro/micro-base station by the macro/micro-cell user in a T2 uplink time slot, and designing a wave beam former by the macro/micro-base station according to the obtained channel state information; and performing wave beam shaping on a sent signal by the macro/micro-base station by utilizing the wave beam former in a macro/micro-base station-macro/micro-cell user link in a T3 uplink time slot, simultaneously sending signals to a micro/macro-base station by a micro/macro-cell user, transmitting data sent by the macro/micro-base station to the micro/macro-base station by a could computing center, cancelling interference signals from the macro/micro-base station by the micro/macro-base station and then demodulating and restoring the signals of the micro/macro-cell user.
Description
Technical field
The present invention relates to wireless communication field, more particularly, to a kind of Communication Jamming removing method of cloud Radio Access Network.
Background technology
With the fast development of mobile communication, the introducing of smart mobile phone, cloud computing, the application of mobile video business scale, band
Move mobile Internet and the rapid growth of high band wide data business, lead to frequency spectrum resource increasingly rare.In order to meet continuous increasing
Long mobile subscriber business demand, needs to research and develop next generation wireless communication technique construction Novel movable communication network.
In 4G LTE wireless communication standard, multi-antenna technology（MIMO）Become the standard configuration of base station.Recently, people
Propose extensive MIMO or Massive MIMO technology on the basis of MIMO, it has the advantage that：First, with respect to tradition
The method improving power system capacity by miniature cell sizes, extensive MIMO passes through the direct antenna number increasing base station and can increase
Adding system capacity；Secondly, large-scale antenna array increased antenna aperature, can reduce uplink downlink institute by relevant merging
The transmission power needing, meets the requirement of green communications.Extensive MIMO is considered as towards the year two thousand twenty mobile communication application demand
The 5th third-generation mobile communication（5G）The key technology of network.
There are some researches show, in the extensive mimo system of multiple cell multi-user, ensureing certain user communication quality
Under the premise of, when having imperfect channel state information, the transmission power of user is inversely proportional to the antenna number of base station, and works as channel status
When information is undesirable, then it is inversely proportional to the square root of antenna for base station number.And, using channel reciprocity, the expense of channel training
Only related to the number of users of every cell, and unrelated with antenna for base station number.Therefore, when antenna for base station number tends to infinite, can't
The feedback overhead of increase system.Compared with traditional MIMO, it is with antenna for base station number in place of the main difference of extensive MIMO
Increase, noise and interference can be averaged, therefore can increase power system capacity.
In macrocell, mobile subscriber can be supported using extensive MIMO base station.But the marginal area covering in macrocell,
Due to weak output signal and interference, service quality it is difficult to ensure that, and the in-door covering that traditional macrocellular network is not provided that.Micro-
Cell（Small Cell）Technology provides quick, inexpensive network capacity extension scheme, can for Urban Thermal point region, suburb and
Blind spot provides special covering and capacity.Small Cell micro-base station is effective supplement of macrocell in capacity with covering, and is
The Main Means of layered heterogeneous network deployment, can build cubic network effectively, and shunting absorbs the portfolio of macro base station.
The Light Radio micro-base station of the typical case of Small Cell deployment such as AT＆T Labs's invention, it holds in the network increasing equivalent
50% every bit data transmission cost during amount, is saved compared with legacy network.
Based on the respective advantage of extensive MIMO and Small Cell, for by Small Cell micro-base station and macrocellular phase
In conjunction with cubic network, simultaneously use for reference cloud computing theory base station baseband part introduce cloud computing build cloud base station, be to lead down
The brand-new beehive net scheme of a generation, the shared and dynamically distributes of achievable wireless network resource simultaneously lift network efficiency.
In the cubic network being built by extensive MIMO and Small Cell, there is dissimilar presence of intercell interference, special
Be not grand in downlink, micro-base station simultaneously sending signal when, the interference to Microcell user for the macro base station sending signal.In order to disappear
When carrying out wave beam forming except presence of intercell interference, macro base station need to be known to the channel condition information of Microcell user link.Yun Wu
In line access system, there is greater number of small cell, need large-scale cell-to-cell information interaction, this is in real system
In be difficult to.
Content of the invention
The present invention is intended to provide a kind of cloud Radio Access Network of low complex degree（CRAN）The interference elimination method of communication, uses
Disturbing and improving power system capacity in reduction downlink transfer link.
Cloud Radio Access Network framework such as Fig. 1 that the present invention provides, it is by macrocell, Microcell, baseband processing unit, cloud
Calculating center forms, wherein macro cell base station RF remote unit（RRU）Configure extensive mimo antenna, in order to support outdoor shifting
Employ family；The micro-base station RRU end antenna configurations of Microcell are same as general LTE standard, cover for indoor and hot spot region.Grand,
The Base Band Unit of micro-base station（BBU）By common public radio interface bus（CPRI）It is connected, form the Base-Band Processing concentrated
Unit, grand, micro-base station is communicated with cloud computing center by baseband processing unit, the grand, micro-base station in each macrocell and cloud meter
In calculation, a baseband processing unit is connected in the heart, and realizes multi-plot joint signal processing and resource allocation using cloud computing.
In order to reduce the feedback overhead of channel condition information, the present invention adopts the working method of TDD, during TDD
Gap is divided into：Ascending time slot is designated as Tu time slot and descending time slot is designated as Td time slot, and tdd frame structure is by sub-frame of uplink and descending sub frame group
Become.During traditional TDD working method, macrocell and Microcell all send sub-frame of uplink in ascending time slot；Under descending time slot sends
Row subframe, as shown in Figure 2.Especially, disturb between grand, micro-base station to reduce in heterogeneous network, devise new tdd frame structure,
In TDD working method, macrocell sends sub-frame of uplink in descending time slot, and ascending time slot sends descending sub frame；Microcell under
Row time slot sends descending sub frame, and ascending time slot sends descending sub frame, as shown in Figure 3 so that between dissimilar base station tdd frame when
Between upper reciprocity, that is, when macro base station sub-frame of uplink communicate, micro-base station utilizes descending sub frame communication；Macro base station descending sub frame communicates
When, the sub-frame of uplink communication of micro-base station.So, in Td time slot, if macro base station receives upward signal, micro-base station sends descending
Signal；In Tu time slot, if macro base station sends downstream signal, micro-base station receives upward signal.
Cloud wireless communications method proposed by the present invention eliminates the implementation steps of macro base station interference signal as shown in figure 5, concrete
Realize step as follows：
Step（1）, in T1 descending time slot, macro base station pilot signal transmitted s, macrocell user is using the pilot tone receiving
Signal s estimates the channel condition information H of downlinkm；
Step（2）, in T2 ascending time slot, the information feedback of macrocell uplink is arrived by macrocell user
Macro base station, the channel condition information of described macrocell uplink is the reciprocity based on TDD, by step（1）Middle macrocell
The channel condition information H of downlinkmObtain, that is, macrocell uplink channel condition information is
Step（3）, macro base station is according to the channel condition information of the macrocell uplink obtainingDesign Beam-former
Wm；
Wherein, Beam-former is using conjugation Beam-former
Beam-former can eliminate interference between each community user, and choosing conjugation Beam-former can also solve further
Due to the higher high problem leading to computation complexity of the dimension of channel transfer matrices in extensive mimo system.
Step（4）, in T3 ascending time slot, in macro base station-macrocell user link, macro base station utilizes Beam-former Wm
To sending signal xmCarry out signal W after wave beam formingm·xmIt is sent to channel, cloud meter is sent to by baseband processing unit simultaneously
Calculation center；
Because macro base station is with broadcast mode sending signal, therefore each macrocell user and micro-base station all can receive, and pass through
Interference between macrocell user and micro-base station in Fig. 4 is converted into the interference between macro base station and micro-base station by this step, this
The signal that the interference macro base station that as micro-base station receives is sent with broadcast mode；
Step（5）, simultaneously in T3 ascending time slot, in Microcell user-micro-base station link, Microcell user's sending signal
To micro-base station, micro-base station uplink receiving signal ysThe useful signal sending including user in Microcell and the interference from macro base station
Signal Wm·xm；
Step（6）, cloud computing center passes through baseband processing unit transmission data W of macro base stationm·xmIt is sent to micro- base
Stand, micro-base station is by receipt signal ysIn from macro base station interference signal Wm·xmAfter elimination, re-demodulation recovers Microcell user letter
Number, wherein eliminating computing formula is ys-Wm·xm.
Cloud wireless communications method proposed by the present invention eliminates the implementation steps of micro-base station interference signal as shown in fig. 6, concrete
Realize step as follows：
Step（1）, in T1 descending time slot, micro-base station pilot signal transmitted s, Microcell user is using the pilot tone receiving
Signal s estimates the channel condition information H of downlinkm；
Step（2）, in T2 ascending time slot, the information feedback of picocell uplink is arrived by Microcell user
Micro-base station, the channel condition information of described picocell uplink is the reciprocity based on TDD, by step（1）Middle Microcell
The channel condition information H of downlinkmObtain, that is, picocell uplink channel condition information is
Step（3）, micro-base station is according to the channel condition information of the picocell uplink obtainingDesign Beam-former
Wm；
Wherein, Beam-former is using conjugation Beam-former
Beam-former can eliminate interference between each community user, and choosing conjugation Beam-former can also solve further
Due to the higher high problem leading to computation complexity of the dimension of channel transfer matrices in extensive mimo system.
Step（4）, in T3 ascending time slot, in micro-base station-Microcell user link, micro-base station utilizes Beam-former Wm
To sending signal xmCarry out W after wave beam formingm·xmIt is sent to channel, be sent in cloud computing by baseband processing unit simultaneously
The heart；
Because micro-base station is with broadcast mode sending signal, therefore each Microcell user and macro base station all can receive, and pass through
Interference between Microcell user and macro base station in Fig. 4 is converted into the interference between micro-base station and macro base station by this step, this
The signal that the interference micro-base station that as macro base station receives is sent with broadcast mode；
Step（5）, simultaneously in T3 ascending time slot, in macrocell user-macro base station link, macrocell user sending signal
To macro base station, macro base station uplink receiving signal ysThe useful signal sending including user in macrocell and the interference from micro-base station
Signal Wm·xm；
Step（6）, cloud computing center passes through baseband processing unit transmission data W of micro-base stationm·xmIt is sent to grand base
Stand, macro base station is by receipt signal ysIn from micro-base station interference signal Wm·xmAfter elimination, re-demodulation recovers Microcell user letter
Number, wherein eliminating computing formula is ys-Wm·xm.
Beneficial effect
Compared with general tdd communication system, the advantage of cloud wireless access system proposed by the present invention is：First, one
As TDD system need to estimate the channel condition information of macro base station-Microcell user link and micro-base station-macrocell user link
Channel condition information, such as Fig. 4.The present invention using the tdd frame structure proposing and CRAN communication means, then need not carry out isomery cell
Between channel estimation, that is, macro base station-Microcell user link channel condition information estimate and micro-base station-macrocell user link
Channel condition information estimate, solve a difficult problem for Practical Project realization, such as Fig. 5, Fig. 6.
Secondly, using the mixed networking of extensive MIMO and Small cell, carry while reducing whole system energy consumption
High network capacity.
Brief description
Fig. 1 cloud Radio Access Network framework；
Fig. 2 general TDD time slot schematic diagram；
Fig. 3 TDD proposed by the present invention time slot schematic diagram；
Fig. 4 general TDD CRAN signal transmitting and receiving schematic diagram：Macro base station and Microcell inter-user interference,Micro-
Disturb between base station and macrocell user；
Fig. 5 proposes to eliminate the TDD CRAN signal transmitting and receiving schematic diagram of macro base station interference：The interference to the micro-base station for → macro base station,
→ communication link；
The TDD CRAN signal transmitting and receiving schematic diagram of the elimination micro-base station interference that Fig. 6 proposes：→ micro-base station is done to macro base station
Disturb, → communication link；
The cloud Radio Access Network framework of Fig. 7 specific embodiment；
Fig. 8 the inventive method flow chart.
Specific embodiment
The invention provides a kind of communication means of cloud Radio Access Network, its main thought is that isomery minizone adopts
The mode of operation of TDD subframe time slot reciprocity, need not interact channel condition information between different districts and eliminate micro-base station in Microcell
In the macro base station in its place macrocell receiving and adjacent macro cell, the interference signal of macro base station, elimination macro base station receive
The micro-base station of Microcell that the micro-base station of Microcell covering from this macro base station arriving and adjacent macro base station cover dry
Disturb signal., this framework is by two macro base station cells B taking cloud Radio Access Network framework as shown in Figure 7 as a example1And B2Composition, grand
Base station cell B1Including a macro base station BS1, a macrocell user U1, a Microcell b1, wherein Microcell b1Comprise one
Micro-base station bs1With a Microcell user u1；Macro base station cell B2Including a macro base station BS2, two macrocell user U2、U3,
One Microcell b2, wherein Microcell b2Comprise micro-base station bs2With two Microcell user u2、u3；
Eliminate grand base in the macro base station in its place macrocell that in Microcell, micro-base station receives and adjacent macro cell
The interference signal specific implementation step stood is as follows
Step（1）, in T1 descending time slot, macro base station BS1Pilot signal transmitted s1, macrocell user U1Using receiving
Pilot signal s1Estimate BS1-U1The channel condition information H of downlinkm1, in the same manner, macro base station BS2Pilot signal transmitted s2,
Macrocell user U2、U3Using pilot signal s receiving2Estimate BS respectively2-U2、BS2-U3The channel status of downlink
Information Hm2、Hm3；
Step（2）, in T2 ascending time slot, macrocell user U1By U1-BS1The information feedback of up-link
To macro base station BS1, the channel condition information of described macrocell uplink is the reciprocity based on TDD, by step（1）In grand
The channel condition information of cellular downlink obtains, that is,Macrocell user U2By U2-BS2The channel status letter of up-link
Breath feeds back to macro base station BS2, that is,Macrocell user U3By U3-BS2The information feedback of up-link is to macro base station
BS2, that is,
Step（3）, macro base station BS1Channel condition information according to the macrocell uplink obtainingDesign wave beam shape
Grow up to be a useful personMacro base station BS2Channel condition information according to the macrocell uplink obtaining Design wave beam
Shaper
Step（4）, in T3 ascending time slot, in BS1-U1In downlink, macro base station BS1Using Beam-former Wm1Right
Sending signal xm1It is sent to channel, the signal after wave beam forming is W after carrying out wave beam formingm1·xm1, it is also sent to cloud meter simultaneously
The baseband processing unit at calculation center；In the same manner, in BS2-U2Downlink in, macro base station BS2Using Beam-former Wm2To transmission
Signal xm2It is sent to channel, the signal after wave beam forming is after carrying out wave beam formingIt is also sent in cloud computing simultaneously
The baseband processing unit of the heart；In the same manner, in BS2-U3Downlink in, macro base station BS2Using Beam-former Wm2To sending signal
xm3It is sent to channel, the signal after wave beam forming is after carrying out wave beam formingIt is also sent to cloud computing center simultaneously
Baseband processing unit；
Because macro base station is with broadcast mode sending signal, therefore each macrocell user and micro-base station all can receive, and pass through
This step is by macrocell B1Middle user U1And its adjacent macro cell B2Middle user U2、U3With micro-base station bs1Between interference be converted into
Macrocell B1Middle macro base station BS1And its adjacent macro cell B2Middle macro base station BS2With micro-base station bs1Between interference；By macrocell B2
Middle user U2、U3And its adjacent macro cell B1Middle user U1With micro-base station bs2Between interference be converted into macrocell B2Middle macro base station
BS2And its adjacent macro cell B1Middle macro base station BS1With micro-base station bs2Between interference；
Step（5）, simultaneously in T3 ascending time slot, in u1-bs1Up-link in, Microcell user u1Transmit a signal to
Micro-base station bs1, micro-base station bs1Uplink receiving signal is yu1-bs1s, wherein yu1-bs1sIncluding Microcell user u1The useful letter sending
Number and in the macrocell of micro-base station place macro base station interference signal Wm1·xm1, and adjacent macro cell in macro base station dry
Disturb signal Wm2·xm2；In u2-bs2Up-link in, Microcell user u2Transmit a signal to micro-base station bs2, micro-base station bs2On
Row receipt signal is yu2-bs2s, wherein yu2-bs2sIncluding Microcell user u2Send useful signal and from micro-base station be located grand
Interference signal W of macro base station in cellm2·xm2, and adjacent macro cell in macro base station interference signal Wm1·xm1；In u3-bs2
Up-link in, Microcell user u3 transmits a signal to micro-base station bs2, micro-base station bs2Uplink receiving signal is yu3-bs2s, its
Middle yu3-bs2sIncluding Microcell user u3The useful signal sending and the interference signal being derived from macro base station in the macrocell of micro-base station place
Wm2·xm2, and adjacent macro cell in macro base station interference signal Wm1·xm1；
Step（6）, micro-base station bs1Request is sent to cloud computing center by baseband processing unit, request obtains macro base station
BS1、BS2Data Wm1·xm1、Wm2·xm2, cloud computing center passes through baseband processing unit by Wm1·xm1、Wm2·xm2Send to
Micro-base station bs1, micro-base station bs1By receipt signal yu1-bs1sIn from macro base station interference signal Wm1·xm1、Wm2·xm2Eliminate, disappear
Except computing formula obtains micro-base station bs1Useful receipt signal is yu1-bs1s-Wm1·xm1-Wm2·xm2, that is,Demodulation recovers Microcell user u respectively again1Signal；In the same manner, cloud computing center
Data W by the macro base station receiving in baseband processing unitm1·xm1、Wm2·xm2It is sent to micro-base station bs2, then can be by micro- base
Stand bs2Receipt signal yu2-bs2sIn from macro base station interference signal Wm1·xm1、Wm2·xm2Eliminate, eliminate computing formula and obtain
Micro-base station bs1Useful receipt signal is yu2-bs2s-Wm1·xm1-Wm2·xm2, that is,
Re-demodulation recovers Microcell user u2Signal；Simultaneously can be by micro-base station bs2Receipt signal yu3-bs2sIn from macro base station interference letter
Number Wm1·xm1、Wm2·xm2Eliminate, eliminate computing formula to obtain the useful receipt signal of micro-base station bs1 is yu3-bs2s-Wm1·xm1-
Wm2·xm2, that is,Re-demodulation recovers Microcell user u3Signal；
The micro-base station of the Microcell covering from this macro base station that elimination macro base station receives and adjacent macro base station cover
The interference signal specific implementation step of the micro-base station of Microcell of lid is as follows：
Step（1）, in T1 descending time slot, micro-base station bs1Pilot signal transmitted s1, Microcell user u1Using receiving
Pilot signal s1Estimate bs1-u1The channel condition information H of downlinkm1, in the same manner, micro-base station bs2Pilot signal transmitted s2,
Microcell user u2、u3Using pilot signal s receiving2Estimate bs respectively2-u2、bs3-u3The channel status of downlink
Information Hm2、Hm3；
Step（2）, in T2 ascending time slot, Microcell user u1By u1-bs1The information feedback of up-link
To micro-base station bs1, the channel condition information of described picocell uplink is the reciprocity based on TDD, by step（1）In micro-
The channel condition information of cellular downlink obtains, that is,Microcell user u2By u2-bs2The channel status letter of up-link
Breath feeds back to micro-base station bs2, that is,Microcell user u3By u3-bs3The information feedback of up-link is to micro- base
Stand bs2, that is,
Step（3）, micro-base station bs1Channel condition information according to the picocell uplink obtainingDesign wave beam shape
Grow up to be a useful personMicro-base station bs2Channel condition information according to the picocell uplink obtaining Design wave beam
Shaper
Step（4）, in T3 ascending time slot, in bs1-u1In downlink, micro-base station bs1Using Beam-former Wm1Right
Sending signal xm1It is sent to channel, the signal after wave beam forming is W after carrying out wave beam formingm1·xm1, it is also sent to cloud meter simultaneously
The baseband processing unit at calculation center；In the same manner, in bs2-u2Downlink in, micro-base station bs2Using Beam-former Wm2To transmission
Signal xm2It is sent to channel, the signal after wave beam forming is after carrying out wave beam formingIt is also sent in cloud computing simultaneously
The baseband processing unit of the heart；In the same manner, in bs2-u3Downlink in, micro-base station bs2Using Beam-former Wm2To sending signal
xm2It is sent to channel, the signal after wave beam forming is after carrying out wave beam formingIt is also sent to cloud computing center simultaneously
Baseband processing unit；
Because micro-base station is with broadcast mode sending signal, therefore each Microcell user and macro base station all can receive, and pass through
This step is by Microcell b1User u1And its adjacent Microcell b2Middle user u2、u3With macro base station BS1Between interference be converted into micro-
Cell b1Middle micro-base station bs1And its adjacent Microcell b2Middle micro-base station bs2With macro base station BS1Between interference；By Microcell b2In
User u2、u3And its adjacent Microcell b1Middle user u1With macro base station BS2Between interference be converted into Microcell b2Middle micro-base station bs2
And its adjacent Microcell b1Middle micro-base station bs1With macro base station BS2Between interference；
Step（5）, simultaneously in T3 ascending time slot, in U1-BS1Up-link in, macrocell user U1Transmit a signal to
Macro base station BS1, macro base station BS1Uplink receiving signal is respectively yU1-BS1s, wherein yU1-BS1sIncluding macrocell user U1Send has
Interference signal W with signal with from micro-base stationm1·xm1, and adjacent Microcell in micro-base station interference signal Wm2·xm2；?
U2-BS2Up-link in, macrocell user U2Transmit a signal to macro base station BS2, macro base station BS2Uplink receiving signal is
yU2-BS2s, wherein yU2-BS2sIncluding macrocell user U2The useful signal sending and the Microcell in macro base station coverage
Interference signal W of middle micro-base stationm2·xm2, and adjacent Microcell in micro-base station interference signal Wm1·xm1；In U3-BS2Upper
In line link, macrocell user U3Transmit a signal to macro base station BS2, macro base station BS2Uplink receiving signal is yU3-BS2s, wherein
yU3-BS2sIncluding macrocell user U3In the useful signal sending and the Microcell in macro base station coverage, micro-base station is dry
Disturb signal Wm2·xm2, and adjacent Microcell in micro-base station interference signal Wm1·xm1；
Step（6）, cloud computing center passes through baseband processing unit by data W of the micro-base station receivingm1·xm1、Wm2·
xm2It is sent to macro base station BS1, macro base station is by BS1Receipt signal yU1-BS1sIn from micro-base station interference signal Wm1·xm1、Wm2·
xm2Eliminate, eliminate computing formula to obtain the useful receipt signal of macro base station BS1 is yU1-BS1s-Wm1·xm1-Wm2·xm2, that is,Demodulation recovers macrocell user U respectively again1Signal；In the same manner, cloud computing center
By baseband processing unit by data W of the micro-base station receivingm1·xm1、Wm2·xm2It is sent to macro base station BS2, macro base station will
BS2Receipt signal yU2-BS2sIn from micro-base station interference signal Wm1·xm1、Wm2·xm2Eliminate, elimination computing formula obtains grand
Base station BS2Useful receipt signal is yU2-BS2s-Wm1·xm1-Wm2·xm2, that is,
Re-demodulation recovers macrocell user U2Signal；Simultaneously can be by macro base station BS2Receipt signal yU3-BS2sIn from micro-base station interference letter
Number Wm1·xm1、Wm2·xm2Eliminate, eliminate computing formula and obtain macro base station BS2Useful receipt signal is yU3-BS2s-Wm1·xm1-
Wm2·xm2, that is,Re-demodulation recovers macrocell user U3Signal.
Claims (3)
1. a kind of macro base station interference elimination method of cloud Radio Access Network, based on new frame structure, that is, when the up son of macro base station
During frame traffic, micro-base station utilizes descending sub frame to communicate；During the communication of macro base station descending sub frame, the sub-frame of uplink communication of micro-base station, its
It is characterised by comprising the following steps：
Step (1), in T1 descending time slot, macro base station pilot signal transmitted s, macrocell user is using the pilot signal receiving
S estimates the channel condition information H of downlinkm；
Step (2), in T2 ascending time slot, macrocell user is by the information feedback of macrocell uplink to grand base
Stand, the channel condition information of described macrocell uplink is the reciprocity based on new frame structure, by grand little in step (1)
The channel condition information H of area's downlinkmObtain, that is, macrocell uplink channel condition information is
Step (3), macro base station is according to the channel condition information of the macrocell uplink obtainingDesign Beam-former Wm；
Step (4), in T3 ascending time slot, in macro base station-macrocell user link, macro base station utilizes Beam-former WmTo send out
The number of delivering letters xmCarry out signal W after wave beam formingm·xmIt is sent to channel, be sent in cloud computing by baseband processing unit simultaneously
The heart；
Step (5), simultaneously in T3 ascending time slot, in Microcell user-micro-base station link, Microcell user transmits a signal to micro-
Base station, micro-base station uplink receiving signal ysThe useful signal sending including user in Microcell and the interference signal from macro base station
Wm·xm；
Step (6), cloud computing center passes through transmission data W macro base station for the Base-Band Processing centerm·xmIt is sent to micro-base station, micro-
Base station is by receipt signal ysIn from macro base station interference signal Wm·xmAfter elimination, re-demodulation recovers Microcell subscriber signal, its
Middle elimination computing formula is ys-Wm·xm.
2. a kind of cloud Radio Access Network according to claim 1 macro base station interference elimination method it is characterised in that：Institute
The Beam-former stated is using conjugation Beam-former
3. a kind of micro-base station interference elimination method of cloud Radio Access Network, based on new frame structure, that is, when the up son of macro base station
During frame traffic, micro-base station utilizes descending sub frame to communicate；During the communication of macro base station descending sub frame, the sub-frame of uplink communication of micro-base station, its
It is characterised by comprising the following steps：
Step (1), in T1 descending time slot, micro-base station pilot signal transmitted s, Microcell user is using the pilot signal receiving
S estimates the channel condition information H of downlinkm；
Step (2), in T2 ascending time slot, Microcell user is by the information feedback of picocell uplink to micro- base
Stand, the channel condition information of described picocell uplink is the reciprocity based on new frame structure, by small in step (1)
The channel condition information H of area's downlinkmObtain, that is, picocell uplink channel condition information is
Step (3), micro-base station is according to the channel condition information of the picocell uplink obtainingDesign Beam-former Wm；
Wherein, Beam-former is using conjugation Beam-former
Step (4), in T3 ascending time slot, in micro-base station-Microcell user link, micro-base station utilizes Beam-former WmTo send out
The number of delivering letters xmCarry out W after wave beam formingm·xmIt is sent to channel, cloud computing center is sent to by baseband processing unit simultaneously；
Step (5), simultaneously in T3 ascending time slot, in macrocell user-macro base station link, macrocell user transmits a signal to grand
Base station, macro base station uplink receiving signal ysThe useful signal sending including user in macrocell and the interference signal from micro-base station
Wm·xm；
Step (6), cloud computing center passes through transmission data W micro-base station for the Base-Band Processing centerm·xmIt is sent to macro base station, grand
Base station is by receipt signal ysIn from micro-base station interference signal Wm·xmAfter elimination, re-demodulation recovers Microcell subscriber signal, its
Middle elimination computing formula is ys-Wm·xm.
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| CN105323034B (en) * | 2014-07-11 | 2019-09-06 | 上海朗帛通信技术有限公司 | A kind of base station, multi-antenna communication method and equipment in UE |
| CN104144485B (en) * | 2014-07-17 | 2017-12-26 | 北京邮电大学 | User equipment ascending power control method in the dual link scene of up-downgoing separation |
| CN106160814B (en) * | 2016-06-14 | 2019-04-19 | 中国电子科技集团公司第五十四研究所 | A kind of multi-base station cooperative downlink transmission method based on interference alignment techniques |
| CN109819523B (en) * | 2017-11-20 | 2022-03-29 | 中国电信股份有限公司 | Communication method and communication system |
| CN110445577B (en) * | 2019-06-27 | 2021-09-03 | 福建师范大学 | System and method for edge resource reuse and interference elimination of heterogeneous network base station |
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