CN102104880A - Interference coordination method among downlink cells in relay wireless communication network - Google Patents

Interference coordination method among downlink cells in relay wireless communication network Download PDF

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CN102104880A
CN102104880A CN2010105917305A CN201010591730A CN102104880A CN 102104880 A CN102104880 A CN 102104880A CN 2010105917305 A CN2010105917305 A CN 2010105917305A CN 201010591730 A CN201010591730 A CN 201010591730A CN 102104880 A CN102104880 A CN 102104880A
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user
interference
base station
cell
relay station
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CN102104880B (en
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刘婷婷
侯雪颖
张千
杨晨阳
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Beihang University
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Abstract

The invention relates to an interference coordination method among downlink cells in a relay wireless communication network, belonging to the technical field of wireless communication. The base station of the downlink of the relay wireless communication network divides the user area of the cell into non-interference user and interference user according to amount and position of users on the adjacent cell service edge, traditional transmission mode is adopted for the non-interference user, and interference evaded transmission mode is adopted for the interference user. In the interference evaded transmission mode, a relay carries out wave beam forming on the position information of the adjacent cell-edge user and the channel information of the cell interference user so that the interference of the adjacent cell-edge user is effectively evaded. In the method, when all cells adopt the interference evading policy, the performance of all cell-edge users can be effectively protected so that the throughput of the cell-edge user can be improved.

Description

Descending inter-cell interference coordination method in a kind of relay wireless communications network
Technical field
The present invention relates to the descending inter-cell interference coordination method in a kind of relay wireless communications network, belong to technical field of wireless communication.
Background technology
In cellular system, user's received signal energy difference of cell edge, the presence of intercell interference energy that is subjected to are strong, so the communication link quality of Cell Edge User is lower, often can not satisfy the demand of QoS of customer (QoS).Cellular system can adopt the Inter-Cell Interference Coordination technology to manage presence of intercell interference, adopts relaying technique to improve the communication quality of Cell Edge User.
Because Cell Edge User is far away apart from the base station, when directly transmission was adopted in the base station, the signal energy that edge customer can effectively receive was lower.Will introduce more serious presence of intercell interference if improve base station transmitting power.If the base station is issued the relay station near cell edge earlier, be transmitted to Cell Edge User by relay station again, Cell Edge User just can receive stronger signal like this.Because the transmitting power of relaying is lower with respect to the base station, therefore the interference coverage that produces is little, relatively is applicable to the user at Serving cell edge.
Aspect Inter-Cell Interference Coordination, traditional analogue cellular network and GSM cellular network reduce presence of intercell interference by improving frequency duplex factor as one, thereby guarantee the reliability of Cell Edge User.But higher frequency duplex factor as one can the serious spectrum efficiency that reduces cellular system.Present LTE system adopts interference coordination technique such as power control, presence of intercell interference deletion, soft-frequency reuse technology, presence of intercell interference randomization, beam forming to improve the performance of edge customer.
Up-link adopts technology such as power control, presence of intercell interference deletion to carry out interference coordination more.Chinese patent 200810065659 (a kind of inter-cell interference coordination method of relay wireless communications network, 2009 07 month) a kind of inter-cell interference coordination method of relay wireless communications network disclosed, can select to insert relaying or base station by the user, and control in conjunction with transmitting power and to coordinate to disturb between uplink cells.Downlink system adopts technology such as soft-frequency reuse, beam forming to carry out Inter-Cell Interference Coordination more.Technology motion R1-060517 (the Further analysis of the performance of inter-cell interference mitigation with beam-forming of China Mobile in 3GPP work, in February, 2006) just point out, beam forming can be given full play to the advantage of multi-antenna technology, avoid interference by the direction of adjusting wave beam, improve the performance of Cell Edge User.In addition, the beam forming technology also combines the presence of intercell interference of disinthibiting jointly easily with other perturbation techniques.
Traditional system adopts beam forming in the base station, and is low to the user's resolution capability that is in cell edge simultaneously because the user of base station services is more, is difficult to carry out effective jam avoidance.And relay station is generally at the edge of sub-district, and the user of service is less, and distinguishes the edge customer of diverse location easily, can realize avoiding than the more effective area interference in base station.
Summary of the invention
The objective of the invention is to propose the descending inter-cell interference coordination method in a kind of relay wireless communications network, the base station adopts different mode to serve the user of this sub-district according to the situation of adjacent base station Serving cell edge customer, for meeting the neighbor cell edge customer being produced the serious user who disturbs utilizes the spatial beams moulding to avoid interference, thereby effectively reduce the interference that Cell Edge User is subjected to, and improve the throughput of all cell edges.
Descending inter-cell interference coordination method in the relay wireless communications network that the present invention proposes comprises following each step:
(1) the jam avoidance request is sent to the base station of neighbor cell in each base station in the down link of relay wireless communications network, if contain the user who is in cell edge among the user of this service, then edge customer is called " protection user ", the base station comprises the number of " protection user " in the jam avoidance request that neighbor cell base station is sent, and comprises the positional information of " protection user "; If do not contain the user who is in cell edge among the user of this service, then the number that will " protect the user " in the jam avoidance request that neighbor cell base station is sent is designated as zero;
(2) the jam avoidance request of each reception of neighboring cell base station, base station, if the number of " protection user " is zero in the neighbor cell, then all users of this sub-district are non-interference user, if the number of " protection user " is non-vanishing in the neighbor cell, then with neighbor cell in the user of adjacent this sub-district, " protection user " position be interference user, other users are non-interference user;
(3) the traditional mode transmission is adopted to the non-interference user of this sub-district in each base station, and interference user is adopted the jam avoidance mode transfer, and detailed process is as follows:
(3-1) establish and have N interference user in this sub-district, there be K protection user in neighbor cell, and relay station in the down link that user position information sends to the relay wireless communications network is simultaneously protected with the data to be transmitted of N interference user and K in the base station;
(3-2) relay station to this sub-district n (n=1 ..., the launching beam vector that adopts when N) individual interference user sends data to be transmitted is:
p n = h n H ( Σ m = 1 N h m h m H + Σ k = 1 K R k ) - 1
H wherein nBe relay station to n (n=1 ..., the N) channel response of individual interference user;
Figure BSA00000388343900022
Expression relay station and k (k=1 ..., K) the relevant battle array of individual protection user's channel;
Figure BSA00000388343900023
It is the battle array bunch vector on the relay station M transmitting antenna;
θ k , i = θ k + ( i D - 1 2 ) φ , i = 1 , . . . , D ;
α kThe expression relay station is to k protection user's path loss;
θ kThe expression relay station is to k protection user's the angle of arrival;
D represents the scattering object number around the relay station;
φ represents the angle spread of relay station antenna;
D represents the spacing of relay station antenna;
λ represents the wavelength of wireless signal.
Annotate: d and λ belong to system's preset parameter, and D and φ can determine α by the communication environment of relay station kAnd θ kCan determine h by the positional information of protection user and relay station nCan utilize the up-downgoing duality in up link, to estimate to obtain.
Descending inter-cell interference coordination method in the relay wireless communications network that the present invention proposes has the following advantages:
(1) the present invention adopts relaying to come the Serving cell edge customer to replace the direct Serving cell edge customer in base station, can reduce area interference like this when improving the Cell Edge User link-quality;
(2) in the present invention, relay station is littler than the beam coverage of the formation of base station, and is strong to the position resolution of edge customer, thus relay station to carry out interference coordination more flexible, it is better to obtain to carry out the interference coordination performance than the base station simultaneously;
(3) in the present invention, do not need protected user's instantaneous channel information when relay station carries out interference coordination, and only need this user position information, so the information that exchanges between the base station is few, the signaling consumption in the time of can effectively saving exchange message.
Description of drawings
Fig. 1 is the FB(flow block) of the inventive method.
Fig. 2 is the signal transmission schematic diagram of base station 1 noiseless universal time coordinated.
Fig. 3 is the signal transmission schematic diagram of base station 1 when interference coordination is arranged.
Fig. 4 is base station 1 and the base station 2 signal transmission schematic diagram when interference coordination being arranged.
Embodiment
Descending inter-cell interference coordination method in the relay wireless communications network that the present invention proposes, its FB(flow block) comprises following each step as shown in Figure 1:
(1) the jam avoidance request is sent to the base station of neighbor cell in each base station in the down link of relay wireless communications network, if contain the user who is in cell edge among the user of this service, then edge customer is called " protection user ", the base station comprises the number of " protection user " in the jam avoidance request that neighbor cell base station is sent, and comprises the positional information of " protection user "; If do not contain the user who is in cell edge among the user of this service, then the number that will " protect the user " in the jam avoidance request that neighbor cell base station is sent is designated as zero;
(2) the jam avoidance request of each reception of neighboring cell base station, base station, if the number of " protection user " is zero in the neighbor cell, then all users of this sub-district are non-interference user, if the number of " protection user " is non-vanishing in the neighbor cell, then with neighbor cell in the user of adjacent this sub-district, " protection user " position be interference user, other users are non-interference user;
(3) the traditional mode transmission is adopted to the non-interference user of this sub-district in each base station, and interference user is adopted the jam avoidance mode transfer, and detailed process is as follows:
(3-1) establish and have N interference user in this sub-district, there be K protection user in neighbor cell, and relay station in the down link that user position information sends to the relay wireless communications network is simultaneously protected with the data to be transmitted of N interference user and K in the base station;
(3-2) relay station to this sub-district n (n=1 ..., the launching beam vector that adopts when N) individual interference user sends data to be transmitted is:
p h = h n H ( Σ m = 1 N h m h m H + Σ k = 1 K R k ) - 1
H wherein nBe relay station to n (n=1 ..., the N) channel response of individual interference user;
Figure BSA00000388343900042
Expression relay station and k (k=1 ..., K) the relevant battle array of individual protection user's channel;
Figure BSA00000388343900043
It is the battle array bunch vector on the relay station M transmitting antenna;
θ k , i = θ k + ( i D - 1 2 ) φ , i = 1 , . . . , D ;
α kThe expression relay station is to k protection user's path loss;
θ kThe expression relay station is to k protection user's the angle of arrival;
D represents the scattering object number around the relay station;
φ represents the angle spread of relay station antenna;
D represents the spacing of relay station antenna;
λ represents the wavelength of wireless signal.
Below in conjunction with accompanying drawing and example the inventive method is further specified.
As shown in Figure 2, in downlink communication, base station 1 service-user 1, base station 2 service-users 2.Because user 1 and user's 2 position is more close, and all near cell edge, so can produce serious disturbance to user 2 during 1 service-user 1 of base station.In this law invention, base station 1 and base station 2 send the jam avoidance request mutually.With base station 2 is example; base station 2 finds that user 2 is in the marginal position of sub-district, therefore user 2 is divided into " protection user ", therefore in the jam avoidance request that send base station 1; the number of " protection user " is 1, and the position of " protection user " is exactly user 2 position.
Base station 1 at first receives the jam avoidance request of sending base station 2; the user 2 that the user 1 of discovery base station 1 service asks for protection apart from base station 2 is very near; therefore service-user 1 can produce serious the interference to user 2; therefore base station 1 divides user 1 into interference user, and adopts the jam avoidance pattern to transmit to user 1.When 1 couple of user in base station 1 adopted the jam avoidance pattern to transmit, base station 1 at first sent to relay station 1 with user 1 data and user 2 positional information, and the launching beam that 1 couple of user of relay station 1 adopts can be expressed as:
p 1 = h 11 H ( h 11 h 11 H + R 12 ) - 1
H wherein 11Be the channel response of relay station 1 to user 1;
Figure BSA00000388343900052
Relevant gust of expression relay station 1 and user's 2 channel;
Figure BSA00000388343900053
It is the battle array bunch vector on the relay station M transmitting antenna;
θ 1 , i = θ 12 + ( 1 D 1 - 1 2 ) φ 1 , i = 1 , . . . , D 1 ;
α 12Expression relay station 1 is to user 2 path loss;
θ 12Expression relay station 1 is to user 2 the angle of arrival;
D 1Scattering object number around the expression relay station 1;
φ 1The angle spread of expression relay station 1 antenna;
D represents the spacing of relay station antenna;
λ represents the wavelength of wireless signal.
After relay station 1 adopted above-mentioned launching beam, as shown in Figure 3, relay station 1 positional information according to user 2 when service-user 1 was carried out jam avoidance, thereby has protected user 2 performance.
In like manner; base station 2 receives the jam avoidance request that send base station 1; the user 1 that the user 2 of discovery base station 2 services asks for protection apart from base station 1 is very near; therefore service-user 2 can produce serious the interference to user 1; therefore base station 2 divides user 2 into interference user, and adopts the jam avoidance pattern to transmit to user 2.Therefore, base station 2 sends to relay station 2 with user 2 data and user 1 positional information, and the launching beam that 2 couples of users of relay station 2 adopt can be expressed as:
p 2 = h 22 H ( h 22 h 22 H + R 21 ) - 1
H wherein 22Be the channel response of relay station 2 to user 2;
Figure BSA00000388343900056
Relevant gust of expression relay station 2 and user's 1 channel;
θ 2 , i = θ 21 + ( i D 2 - 1 2 ) φ 2 , i = 1 , . . . , D 2 ;
α 21Expression relay station 2 is to user 1 path loss;
θ 21Expression relay station 2 is to user 1 the angle of arrival;
D 2Scattering object number around the expression relay station 2;
φ 2The angle spread of expression relay station 2 antennas;
D represents the spacing of relay station antenna;
λ represents the wavelength of wireless signal.
After relay station 2 adopted above-mentioned launching beam, as shown in Figure 4, relay station 2 positional information according to user 1 when service-user 2 was carried out jam avoidance, thereby has protected user 1 performance.All adopt the jam avoidance mode service to be in the user 1 and the user 2 of cell edge when base station 1 and base station 2, then can effectively reduce the presence of intercell interference that user 1 and user 2 are subjected to, thereby improve the performance of edge customer.

Claims (1)

1. the descending inter-cell interference coordination method in the relay wireless communications network is characterized in that this method comprises following each step:
(1) the jam avoidance request is sent to the base station of neighbor cell in each base station in the down link of relay wireless communications network, if contain the user who is in cell edge among the user of this service, then edge customer is called " protection user ", the base station comprises the number of " protection user " in the jam avoidance request that neighbor cell base station is sent, and comprises the positional information of " protection user "; If do not contain the user who is in cell edge among the user of this service, then the number that will " protect the user " in the jam avoidance request that neighbor cell base station is sent is designated as zero;
(2) the jam avoidance request of each reception of neighboring cell base station, base station, if the number of " protection user " is zero in the neighbor cell, then all users of this sub-district are non-interference user, if the number of " protection user " is non-vanishing in the neighbor cell, then with neighbor cell in the user of adjacent this sub-district, " protection user " position be interference user, other users are non-interference user;
(3) the traditional mode transmission is adopted to the non-interference user of this sub-district in each base station, and interference user is adopted the jam avoidance mode transfer, and detailed process is as follows:
(3-1) establish and have N interference user in this sub-district, there be K protection user in neighbor cell, and relay station in the down link that user position information sends to the relay wireless communications network is simultaneously protected with the data to be transmitted of N interference user and K in the base station;
(3-2) relay station to this sub-district n (n=1 ..., the launching beam vector that adopts when N) individual interference user sends data to be transmitted is:
p n = h h H ( Σ m = 1 N h m h m H + Σ k = 1 K R k ) - 1
H wherein nBe relay station to n (n=1 ..., the N) channel response of individual interference user;
Expression relay station and k (k=1 ..., K) the relevant battle array of individual protection user's channel;
Figure FSA00000388343800013
It is the battle array bunch vector on the relay station M transmitting antenna;
θ k , i = θ k + ( i D - 1 2 ) φ , i = 1 , . . . , D ;
α kThe expression relay station is to k protection user's path loss;
θ kThe expression relay station is to k protection user's the angle of arrival;
D represents the scattering object number around the relay station;
φ represents the angle spread of relay station antenna;
D represents the spacing of relay station antenna;
λ represents the wavelength of wireless signal.
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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN105049166A (en) * 2015-08-17 2015-11-11 清华大学 Pilot frequency distribution method based on user geographical location information in large-scale antenna cell
CN108990076A (en) * 2017-05-31 2018-12-11 上海华为技术有限公司 A kind of method of wave beam adjustment and base station
WO2019218301A1 (en) * 2018-05-17 2019-11-21 Nokia Shanghai Bell Co., Ltd. Network-assisted beam scheduling mechanism for directional beamforming transmission
CN110710134A (en) * 2017-08-11 2020-01-17 捷开通讯(深圳)有限公司 Interference rejection for aircraft in wireless communications

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105049166A (en) * 2015-08-17 2015-11-11 清华大学 Pilot frequency distribution method based on user geographical location information in large-scale antenna cell
CN105049166B (en) * 2015-08-17 2017-11-28 清华大学 Pilot distribution method based on user's geographical location information in extensive antenna cells
CN108990076A (en) * 2017-05-31 2018-12-11 上海华为技术有限公司 A kind of method of wave beam adjustment and base station
CN108990076B (en) * 2017-05-31 2021-12-31 上海华为技术有限公司 Beam adjustment method and base station
CN110710134A (en) * 2017-08-11 2020-01-17 捷开通讯(深圳)有限公司 Interference rejection for aircraft in wireless communications
CN110710134B (en) * 2017-08-11 2022-07-08 捷开通讯(深圳)有限公司 Interference rejection for aircraft in wireless communications
WO2019218301A1 (en) * 2018-05-17 2019-11-21 Nokia Shanghai Bell Co., Ltd. Network-assisted beam scheduling mechanism for directional beamforming transmission

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