CN103701737A - 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, relate in particular to a kind of Communication Jamming removing method of cloud Radio Access Network.
Background technology
Along with the fast development of mobile communication, the introducing of smart mobile phone, cloud computing, mobile video business scale are applied, and have driven the rapid growth of mobile Internet and high band wide data business, cause frequency spectrum resource day by day rare.In order to meet ever-increasing mobile subscriber business demand, need to research and develop next generation wireless communication technique construction Novel movable communication network.
In 4G LTE wireless communication standard, multi-antenna technology (MIMO) has become the standard configuration of base station.Recently, people have proposed extensive MIMO or Massive MIMO technology on MIMO basis, its tool has the following advantages: first, with respect to traditional method that miniature cell sizes improves power system capacity of passing through, extensive MIMO can increase power system capacity by the antenna number of direct increase base station; Secondly, extensive aerial array has increased antenna aperature, by relevant merging, can reduce the required transmitting power of uplink downlink, meets the requirement of green communications.Extensive MIMO is considered to towards the key technology of the 5th third-generation mobile communication (5G) network of the year two thousand twenty mobile communication application demand.
There are some researches show, in many communities multi-user's extensive mimo system, guaranteeing under the prerequisite of certain user communication quality, while thering is ideal communication channel state information, user's transmitting power and the antenna number of base station are inversely proportional to, and when channel condition information is undesirable, be inversely proportional to the square root of antenna for base station number.And, utilizing channel reciprocity, the number of users of the expense Jin Yumei community of channel training is relevant, and irrelevant with antenna for base station number.Therefore,, when antenna for base station number tends to infinite, can't increase the feedback overhead of system.Compare with traditional MIMO, the main difference part of extensive MIMO is the increase along with antenna for base station number, and Noise and Interference can be by average, therefore can increase power system capacity.
At macrocell, can adopt extensive MIMO base station to support mobile subscriber.But the fringe region covering at macrocell, due to weak output signal and interference, service quality is difficult to guarantee, and the indoor covering that can not provide of traditional macrocellular network.Technology provides fast, network capacity extension scheme cheaply in Microcell (Small Cell), can put region, suburb and blind spot for Urban Thermal special-purpose covering and capacity is provided.The micro-base station of Small Cell is effectively supplementing of macrocell in capacity and covering, is the Main Means that layered heterogeneous network is disposed, and can effectively build cubic network, the traffic carrying capacity of shunting absorption macro base station.The typical case that Small Cell disposes is as the micro-base station of Light Radio of Bell Laboratory invention, and it saves every Bit data transmission cost of 50% when increasing the network capacity of equivalent compared with legacy network.
Advantage separately based on extensive MIMO and Small Cell, for the cubic network being combined with macrocellular by the micro-base station of Small Cell, use for reference cloud computing theory simultaneously and partly introduce cloud computing structure cloud base station at base station baseband, be to lead follow-on brand-new beehive net scheme, can realize sharing with dynamic assignment and promoting network efficiency of wireless network resource.
In the cubic network being built by extensive MIMO and Small Cell, exist grand in dissimilar presence of intercell interference, particularly down link, micro-base station simultaneously during transmitted signal, the interference of macro base station transmitted signal to Microcell user.While carrying out wave beam forming in order to eliminate presence of intercell interference, need know that macro base station is to the channel condition information of Microcell user link.In cloud wireless access system, have the small cell of a greater number, need large-scale cell-to-cell information interaction, this is difficult to realize in real system.
Summary of the invention
The present invention aims to provide a kind of interference elimination method of cloud Radio Access Network (CRAN) communication of low complex degree, for reducing the interference in downlink transfer link and improve power system capacity.
Cloud Radio Access Network framework provided by the invention is as Fig. 1, and it is by macrocell, Microcell, baseband processing unit, and cloud computing center forms, and wherein macro cell base station RF remote unit (RRU) configures extensive MIMO antenna, in order to support outdoor mobile subscriber; Micro-base station RRU end antenna configuration of Microcell is same as general LTE standard, for indoor and hot spot region, covers.Base Band Unit (BBU) grand, micro-base station is connected by common public radio interface bus (CPRI), form concentrated baseband processing unit, communicate by letter with cloud computing center by baseband processing unit in grand, micro-base station, grand, micro-base station in each macrocell is connected with a baseband processing unit in cloud computing center, and adopts cloud computing to realize the processing of multi-plot joint signal and resource distribution.
In order to reduce the feedback overhead of channel condition information, the present invention adopts the working method of TDD, and TDD time slot 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 comprised of sub-frame of uplink and descending sub frame.During traditional TDD working method, macrocell and Microcell all send sub-frame of uplink at ascending time slot; Descending time slot sends descending sub frame, as shown in Figure 2.Especially, in order to reduce grand in heterogeneous network, micro-inter base station interference, designed novel tdd frame structure, when TDD working method, macrocell sends sub-frame of uplink at descending time slot, and ascending time slot sends descending sub frame; Microcell sends descending sub frame at descending time slot, and ascending time slot sends descending sub frame, as shown in Figure 3, makes tdd frame reciprocity in time between dissimilar base station, and, when macro base station sub-frame of uplink is communicated by letter, micro-base station utilizes descending sub frame communication; During the communication of macro base station descending sub frame, the sub-frame of uplink communication of micro-base station.Like this, in Td time slot, if macro base station receives upward signal, micro-base station sends downstream signal; In Tu time slot, if macro base station sends downstream signal, micro-base station receives upward signal.
As shown in Figure 5, specific implementation step is as follows for the implementation step of the cloud wireless communications method elimination macro base station interference signal that the present invention proposes:
Step (1), in T1 descending time slot, macro base station pilot signal transmitted s, macrocell user utilizes the pilot signal s receiving to estimate the channel condition information H of down link
m;
Step (2), in T2 ascending time slot, macrocell user is by the information feedback of macrocell up link to macro base station, and the channel condition information of described macrocell up link is the reciprocity based on TDD, the channel condition information H of macrocell down link in step (1)
mobtain, macrocell uplink channel state information is
Step (3), macro base station is according to the channel condition information of the macrocell up link obtaining
design Beam-former W
m;
Wherein, Beam-former adopts conjugation Beam-former
Beam-former can be eliminated between each community user and disturb, and chooses conjugation Beam-former and can also further solve the higher high problem that causes computation complexity of dimension due to transmission matrix in extensive mimo system.
Step (4), in T3 ascending time slot, in macro base station-macrocell user link, macro base station utilizes Beam-former W
mto transmitted signal x
mcarry out signal W after wave beam forming
mx
msend to channel, by baseband processing unit, send to cloud computing center simultaneously;
Because macro base station is with broadcast mode transmitted signal, therefore each macrocell user and micro-base station all can receive, interference between macrocell user in Fig. 4 and micro-base station is converted into the interference between macro base station and micro-base station through this step, this interference is the signal that macro base station that micro-base station receives sends with broadcast mode;
Step (5), 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 y simultaneously
scomprise useful signal that user in Microcell sends and from the interference signal W of macro base station
mx
m;
Step (6), cloud computing center by baseband processing unit the transmission data W of macro base station
mx
mbe sent to micro-base station, micro-base station will receive signal y
sin from the interference signal W of macro base station
mx
mafter elimination, then demodulation recovery Microcell subscriber signal, wherein eliminating computing formula is y
s-W
mx
m.
As shown in Figure 6, specific implementation step is as follows for the implementation step that the cloud wireless communications method that the present invention proposes is eliminated micro-base station interference signal:
Step (1), in T1 descending time slot, micro-base station pilot signal transmitted s, Microcell user utilizes the pilot signal s receiving to estimate the channel condition information H of down link
m;
Step (2), in T2 ascending time slot, Microcell user is by the information feedback of Microcell up link to micro-base station, and the channel condition information of described Microcell up link is the reciprocity based on TDD, the channel condition information H of Microcell down link in step (1)
mobtain, uplink channel state information in Microcell is
Step (3), micro-base station is according to the channel condition information of the Microcell up link obtaining
design Beam-former W
m;
Wherein, Beam-former adopts conjugation Beam-former
Beam-former can be eliminated between each community user and disturb, and chooses conjugation Beam-former and can also further solve the higher high problem that causes computation complexity of dimension due to transmission matrix in extensive mimo system.
Step (4), in T3 ascending time slot, in the user link of micro-base station-Microcell, micro-base station utilizes Beam-former W
mto transmitted signal x
mcarry out W after wave beam forming
mx
msend to channel, by baseband processing unit, send to cloud computing center simultaneously;
Because micro-base station is with broadcast mode transmitted signal, therefore each Microcell user and macro base station all can receive, interference between Microcell user and macro base station in Fig. 4 is converted into the interference between micro-base station and macro base station through this step, this interference is the signal that micro-base station that macro base station receives sends with broadcast mode;
Step (5), in T3 ascending time slot, in macrocell user-macro base station link, macrocell user transmits a signal to macro base station, macro base station uplink receiving signal y simultaneously
scomprise user sends in macrocell useful signal and from the interference signal W of micro-base station
mx
m;
Step (6), cloud computing center by baseband processing unit the transmission data W of micro-base station
mx
mbe sent to macro base station, macro base station will receive signal y
sin from the interference signal W of micro-base station
mx
mafter elimination, then demodulation recovery Microcell subscriber signal, wherein eliminating computing formula is y
s-W
mx
m.
Beneficial effect
Compare with general TDD communication system, the advantage of the cloud wireless access system that the present invention proposes is: first, general TDD system need to be estimated the channel condition information of macro base station-Microcell user link and the channel condition information of micro-base station-macrocell user link, as Fig. 4.The present invention adopts tdd frame structure and the CRAN communication means of proposition, without the channel estimating of carrying out isomery minizone, be that the channel condition information estimation of macro base station-Microcell user link and the channel condition information of micro-base station-macrocell user link are estimated, solved the difficult problem that Practical Project is realized, as Fig. 5, Fig. 6.
Secondly, adopt the mixed networking of extensive MIMO and Small cell, when reducing whole system energy consumption, improved network capacity.
Accompanying drawing explanation
Fig. 1 cloud Radio Access Network framework;
The general TDD time slot of Fig. 2 schematic diagram;
The TDD time slot schematic diagram that Fig. 3 the present invention proposes;
The general TDD CRAN of Fig. 4 signal transmitting and receiving schematic diagram:
macro base station and Microcell inter-user interference,
micro-base station and macrocell inter-user interference;
Fig. 5 proposes to eliminate the TDD CRAN signal transmitting and receiving schematic diagram that macro base station disturbs: the interference of → macro base station to micro-base station, → communication link;
The TDD CRAN signal transmitting and receiving schematic diagram that disturb the micro-base station of elimination that Fig. 6 proposes: the interference of → micro-base station to macro base station, → communication link;
The cloud Radio Access Network framework of Fig. 7 embodiment;
Fig. 8 the inventive method flow chart.
Embodiment
The invention provides a kind of communication means of cloud Radio Access Network, its main thought is the mode of operation that isomery minizone adopts the reciprocity of TDD subframe time slot, eliminates the interference signal from macro base station in macro base station and adjacent macro cell in its place macrocell that Zhong Wei base station, Microcell receives, eliminates micro-base station of the Microcell covering from this macro base station that macro base station receives and the interference signal of micro-base station of the Microcell that adjacent macro base station covers without channel condition information between mutual different districts.The cloud Radio Access Network framework of take is as shown in Figure 7 example, and this framework is by two macro base station community B
1and B
2form macro base station community B
1comprise a macro base station BS
1, a macrocell user U
1, a Microcell b
1, Microcell b wherein
1comprise a micro-base station bs
1with a Microcell user u
1; Macro base station community B
2comprise a macro base station BS
2, two macrocell user U
2, U
3, a Microcell b
2, Microcell b wherein
2comprise a micro-base station bs
2with two Microcell user u
2, u
3;
The concrete implementation step of interference signal from macro base station in macro base station and adjacent macro cell in its place macrocell that elimination Zhong Wei base station, Microcell receives is as follows
Step (1), in T1 descending time slot, macro base station BS
1pilot signal transmitted s
1, macrocell user U
1the pilot signal s that utilization receives
1estimate BS
1-U
1the channel condition information H of down link
m1, in like manner, macro base station BS
2pilot signal transmitted s
2, macrocell user U
2, U
3the pilot signal s that utilization receives
2estimate respectively BS
2-U
2, BS
2-U
3the channel condition information H of down link
m2, H
m3;
Step (2), in T2 ascending time slot, macrocell user U
1by U
1-BS
1the information feedback of up link is to macro base station BS
1, the channel condition information of described macrocell up link is the reciprocity based on TDD, in step (1), the channel condition information of macrocell down link obtains,
macrocell user U
2by U
2-BS
2the information feedback of up link is to macro base station BS
2,
macrocell user U
3by U
3-BS
2the information feedback of up link is to macro base station BS
2,
Step (3), macro base station BS
1according to the channel condition information of the macrocell up link obtaining
design Beam-former
macro base station BS
2according to the channel condition information of the macrocell up link obtaining
design Beam-former
Step (4), in T3 ascending time slot, at BS
1-U
1in down link, macro base station BS
1utilize Beam-former W
m1to transmitted signal x
m1carry out sending to channel after wave beam forming, the signal after wave beam forming is W
m1x
m1, the while also sends to the baseband processing unit of cloud computing center; In like manner, at BS
2-U
2down link in, macro base station BS
2utilize Beam-former W
m2to transmitted signal x
m2carry out sending to channel after wave beam forming, the signal after wave beam forming is
also send to the baseband processing unit of cloud computing center simultaneously; In like manner, at BS
2-U
3down link in, macro base station BS
2utilize Beam-former W
m2to transmitted signal x
m3carry out sending to channel after wave beam forming, the signal after wave beam forming is
also send to the baseband processing unit of cloud computing center simultaneously;
Because macro base station is with broadcast mode transmitted signal, therefore each macrocell user and micro-base station all can receive, this step of process is by macrocell B
1middle user U
1and adjacent macro cell B
2middle user U
2, U
3with micro-base station bs
1between interference be converted into macrocell B
1middle macro base station BS
1and adjacent macro cell B
2middle macro base station BS
2with micro-base station bs
1between interference; By macrocell B
2middle user U
2, U
3and adjacent macro cell B
1middle user U
1with micro-base station bs
2between interference be converted into macrocell B
2middle macro base station BS
2and adjacent macro cell B
1middle macro base station BS
1with micro-base station bs
2between interference;
Step (5), simultaneously in T3 ascending time slot, at u
1-bs
1up link in, Microcell user u
1transmit a signal to micro-base station bs
1, micro-base station bs
1uplink receiving signal is y
u1-bs1s, y wherein
u1-bs1scomprise Microcell user u
1the useful signal sending and from the interference signal W of macro base station in the macrocell of place, micro-base station
m1x
m1, and adjacent macro cell in the interference signal W of macro base station
m2x
m2; At u
2-bs
2up link in, Microcell user u
2transmit a signal to micro-base station bs
2, micro-base station bs
2uplink receiving signal is y
u2-bs2s, y wherein
u2-bs2scomprise Microcell user u
2the useful signal sending and from the interference signal W of macro base station in the macrocell of place, micro-base station
m2x
m2, and adjacent macro cell in the interference signal W of macro base station
m1x
m1; At u
3-bs
2up link in, Microcell user u3 transmits a signal to micro-base station bs
2, micro-base station bs
2uplink receiving signal is y
u3-bs2s, y wherein
u3-bs2scomprise Microcell user u
3the useful signal sending and from the interference signal W of macro base station in the macrocell of place, micro-base station
m2x
m2, and adjacent macro cell in the interference signal W of macro base station
m1x
m1;
Step (6), micro-base station bs
1by baseband processing unit, to cloud computing center, send request, request obtains macro base station BS
1, BS
2data W
m1x
m1, W
m2x
m2, cloud computing center by baseband processing unit by W
m1x
m1, W
m2x
m2be sent to micro-base station bs
1, micro-base station bs
1to receive signal y
u1-bs1sin from the interference signal W of macro base station
m1x
m1, W
m2x
m2eliminate, eliminate computing formula and obtain micro-base station bs
1useful reception signal is y
u1-bs1s-W
m1x
m1-W
m2x
m2,
demodulation recovers Microcell user u respectively again
1signal; In like manner, cloud computing center is by the data W of the macro base station receiving in baseband processing unit
m1x
m1, W
m2x
m2send to micro-base station bs
2, can be by micro-base station bs
2receive signal y
u2-bs2sin from the interference signal W of macro base station
m1x
m1, W
m2x
m2eliminate, eliminate computing formula and obtain micro-base station bs
1useful reception signal is y
u2-bs2s-W
m1x
m1-W
m2x
m2,
demodulation recovers Microcell user u again
2signal; Simultaneously can be by micro-base station bs
2receive signal y
u3-bs2sin from the interference signal W of macro base station
m1x
m1, W
m2x
m2eliminate, it is y that elimination computing formula obtains the useful reception signal of micro-base station bs1
u3-bs2s-W
m1x
m1-W
m2x
m2,
demodulation recovers Microcell user u again
3signal;
The concrete implementation step of interference signal of micro-base station of the Microcell that micro-base station of the Microcell covering from this macro base station that elimination macro base station receives and adjacent macro base station cover is as follows:
Step (1), in T1 descending time slot, micro-base station bs
1pilot signal transmitted s
1, Microcell user u
1the pilot signal s that utilization receives
1estimate bs
1-u
1the channel condition information H of down link
m1, in like manner, micro-base station bs
2pilot signal transmitted s
2, Microcell user u
2, u
3the pilot signal s that utilization receives
2estimate respectively bs
2-u
2, bs
3-u
3the channel condition information H of down link
m2, H
m3;
Step (2), in T2 ascending time slot, Microcell user u
1by u
1-bs
1the information feedback of up link is to micro-base station bs
1, the channel condition information of described Microcell up link is the reciprocity based on TDD, in step (1), the channel condition information of Microcell down link obtains,
microcell user u
2by u
2-bs
2the information feedback of up link is to micro-base station bs
2,
microcell user u
3by u
3-bs
3the information feedback of up link is to micro-base station bs
2,
Step (3), micro-base station bs
1according to the channel condition information of the Microcell up link obtaining
design Beam-former
micro-base station bs
2according to the channel condition information of the Microcell up link obtaining
design Beam-former
Step (4), in T3 ascending time slot, at bs
1-u
1in down link, micro-base station bs
1utilize Beam-former W
m1to transmitted signal x
m1carry out sending to channel after wave beam forming, the signal after wave beam forming is W
m1x
m1, the while also sends to the baseband processing unit of cloud computing center; In like manner, at bs
2-u
2down link in, micro-base station bs
2utilize Beam-former W
m2to transmitted signal x
m2carry out sending to channel after wave beam forming, the signal after wave beam forming is
also send to the baseband processing unit of cloud computing center simultaneously; In like manner, at bs
2-u
3down link in, micro-base station bs
2utilize Beam-former W
m2to transmitted signal x
m2carry out sending to channel after wave beam forming, the signal after wave beam forming is
also send to the baseband processing unit of cloud computing center simultaneously;
Because micro-base station is with broadcast mode transmitted signal, therefore each Microcell user and macro base station all can receive, this step of process is by Microcell b
1user u
1and adjacent Microcell b
2middle user u
2, u
3with macro base station BS
1between interference be converted into Microcell b
1in micro-base station bs
1and adjacent Microcell b
2in micro-base station bs
2with macro base station BS
1between interference; By Microcell b
2middle user u
2, u
3and adjacent Microcell b
1middle user u
1with macro base station BS
2between interference be converted into Microcell b
2in micro-base station bs
2and adjacent Microcell b
1in micro-base station bs
1with macro base station BS
2between interference;
Step (5), simultaneously in T3 ascending time slot, at U
1-BS
1up link in, macrocell user U
1transmit a signal to macro base station BS
1, macro base station BS
1uplink receiving signal is respectively y
u1-BS1s, y wherein
u1-BS1scomprise macrocell user U
1the useful signal sending and from the interference signal W of micro-base station
m1x
m1, and the interference signal W of Zhong Wei base station, adjacent Microcell
m2x
m2; At U
2-BS
2up link in, macrocell user U
2transmit a signal to macro base station BS
2, macro base station BS
2uplink receiving signal is y
u2-BS2s, y wherein
u2-BS2scomprise macrocell user U
2the useful signal sending and from the interference signal W of the Zhong Wei base station, Microcell in macro base station coverage
m2x
m2, and the interference signal W of Zhong Wei base station, adjacent Microcell
m1x
m1; At U
3-BS
2up link in, macrocell user U
3transmit a signal to macro base station BS
2, macro base station BS
2uplink receiving signal is y
u3-BS2s, y wherein
u3-BS2scomprise macrocell user U
3the useful signal sending and from the interference signal W of the Zhong Wei base station, Microcell in macro base station coverage
m2x
m2, and the interference signal W of Zhong Wei base station, adjacent Microcell
m1x
m1;
Step (6), cloud computing center by baseband processing unit by the data W of the micro-base station receiving
m1x
m1, W
m2x
m2send to macro base station BS
1, macro base station is by BS
1receive signal y
u1-BS1sin from the interference signal W of micro-base station
m1x
m1, W
m2x
m2eliminate, it is y that elimination computing formula obtains the useful reception signal of macro base station BS1
u1-BS1s-W
m1x
m1-W
m2x
m2,
demodulation recovers macrocell user U respectively again
1signal; In like manner, cloud computing center by baseband processing unit by the data W of the micro-base station receiving
m1x
m1, W
m2x
m2send to macro base station BS
2, macro base station is by BS
2receive signal y
u2-BS2sin from the interference signal W of micro-base station
m1x
m1, W
m2x
m2eliminate, eliminate computing formula and obtain macro base station BS
2useful reception signal is y
u2-BS2s-W
m1x
m1-W
m2x
m2,
demodulation recovers macrocell user U again
2signal; Simultaneously can be by macro base station BS
2receive signal y
u3-BS2sin from the interference signal W of micro-base station
m1x
m1, W
m2x
m2eliminate, eliminate computing formula and obtain macro base station BS
2useful reception signal is y
u3-BS2s-W
m1x
m1-W
m2x
m2,
demodulation recovers macrocell user U again
3signal.
Claims (4)
1. a macro base station interference elimination method for cloud Radio Access Network, based on new frame structure,, when macro base station sub-frame of uplink is communicated by letter, micro-base station utilizes descending sub frame communication; During the communication of macro base station descending sub frame, the sub-frame of uplink communication of micro-base station, is characterized in that comprising the following steps:
Step (1), in T1 descending time slot, macro base station pilot signal transmitted s, macrocell user utilizes the pilot signal s receiving to estimate the channel condition information H of down link
m;
Step (2), in T2 ascending time slot, macrocell user is by the information feedback of macrocell up link to macro base station, and the channel condition information of described macrocell up link is the reciprocity based on new frame structure, the channel condition information H of macrocell down link in step (1)
mobtain, macrocell uplink channel state information is
Step (3), macro base station is according to the channel condition information of the macrocell up link obtaining
design Beam-former W
m;
Step (4), in T3 ascending time slot, in macro base station-macrocell user link, macro base station utilizes Beam-former W
mto transmitted signal x
mcarry out signal W after wave beam forming
mx
msend to channel, by baseband processing unit, send to cloud computing center simultaneously;
Step (5), 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 y simultaneously
scomprise useful signal that user in Microcell sends and from the interference signal W of macro base station
mx
m;
Step (6), cloud computing center passes through Base-Band Processing center the transmission data W of macro base station
mx
mbe sent to micro-base station, micro-base station will receive signal y
sin from the interference signal W of macro base station
mx
mafter elimination, then demodulation recovery Microcell subscriber signal, wherein eliminating computing formula is y
s-W
mx
m.
2. the macro base station interference elimination method of a kind of cloud Radio Access Network according to claim 1, is characterized in that: described Beam-former adopts conjugation Beam-former
3. micro-base station interference elimination method of cloud Radio Access Network, based on new frame structure,, when macro base station sub-frame of uplink is communicated by letter, micro-base station utilizes descending sub frame communication; During the communication of macro base station descending sub frame, the sub-frame of uplink communication of micro-base station, is characterized in that comprising the following steps:
Step (1), in T1 descending time slot, micro-base station pilot signal transmitted s, Microcell user utilizes the pilot signal s receiving to estimate the channel condition information H of down link
m;
Step (2), in T2 ascending time slot, Microcell user is by the information feedback of Microcell up link to micro-base station, and the channel condition information of described Microcell up link is the reciprocity based on new frame structure, the channel condition information H of Microcell down link in step (1)
mobtain, uplink channel state information in Microcell is
Step (3), micro-base station is according to the channel condition information of the Microcell up link obtaining
design Beam-former W
m;
Wherein, Beam-former adopts conjugation Beam-former
Step (4), in T3 ascending time slot, in the user link of micro-base station-Microcell, micro-base station utilizes Beam-former W
mto transmitted signal x
mcarry out W after wave beam forming
mx
msend to channel, by baseband processing unit, send to cloud computing center simultaneously;
Step (5), in T3 ascending time slot, in macrocell user-macro base station link, macrocell user transmits a signal to macro base station, macro base station uplink receiving signal y simultaneously
scomprise user sends in macrocell useful signal and from the interference signal W of micro-base station
mx
m;
Step (6), cloud computing center is by the transmission data W of Ba Wei base station, Base-Band Processing center
mx
mbe sent to macro base station, macro base station will receive signal y
sin from the interference signal W of micro-base station
mx
mafter elimination, then demodulation recovery Microcell subscriber signal, wherein eliminating computing formula is y
s-W
mx
m.
4. micro-base station interference elimination method of a kind of cloud Radio Access Network according to claim 3, is characterized in that: described Beam-former adopts conjugation Beam-former
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104144485A (en) * | 2014-07-17 | 2014-11-12 | 北京邮电大学 | Method for controlling uplink power of user equipment in dual-connection scene with uplink and downlink separated |
| WO2016004884A1 (en) * | 2014-07-11 | 2016-01-14 | 上海朗帛通信技术有限公司 | Base station and large-scale mimo communication method and device in ue |
| CN106160814A (en) * | 2016-06-14 | 2016-11-23 | 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 |
| CN109819523A (en) * | 2017-11-20 | 2019-05-28 | 中国电信股份有限公司 | Communication means and communication system |
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| CN102340344B (en) * | 2010-07-27 | 2015-03-25 | 电信科学技术研究院 | Method for avoiding interference between base stations in heterogeneous network, and equipment |
| CN102196580B (en) * | 2011-06-22 | 2014-09-03 | 新邮通信设备有限公司 | Method for dynamically configurating TDD (Time Division Duplex) base station uplink and downlink subframe scale |
| CN103298115B (en) * | 2012-02-27 | 2015-10-14 | 电信科学技术研究院 | A kind of base station and carry out the method for TDD base station ascending-descending subframes configuration |
| CN102820954B (en) * | 2012-08-15 | 2015-04-29 | 北京工业大学 | Method for reducing inter-cell interference of heterogeneous network |
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| CN103068050B (en) * | 2012-12-25 | 2016-12-28 | 上海无线通信研究中心 | Uplink and downlink timeslot resource allocation method based on interference perception in a kind of tdd systems |
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| 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 |
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| CN109819523B (en) * | 2017-11-20 | 2022-03-29 | 中国电信股份有限公司 | Communication method and communication system |
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