WO2006133602A1

WO2006133602A1 - A kind of wireless communication base station dynamic distributed antenna selective system and the implementation method thereof

Info

Publication number: WO2006133602A1
Application number: PCT/CN2005/000865
Authority: WO
Inventors: Yutang Xie; Xiaoming Wang; Jingyi Li; Lianbin Xiao
Original assignee: Zte Corporation
Priority date: 2005-06-16
Filing date: 2005-06-16
Publication date: 2006-12-21
Also published as: CN101147333A

Abstract

A kind of wireless communication base station dynamic distributed antenna selective system and the implementation method thereof , it includes: N pathway transmitter, N pathway receiver and one aerial array which is made up of K independent antenna elements, therein K is greater than N. The implementation method of the present invention is that elects and carries out transmitting N aerials from said K antenna elements, so as according to the user's distribution and the service demand condition, completes the suitable or needed transmission in one specific cell; When receiving, elects N aerials thereof to complete the required reception. The rule of the aerial selection method is realized synthetically according to the user's service matching degree and system capacity and quality factor etc.

Description

Dynamic distributed base station selection system for wireless communication base station and implementation method thereof

The present invention relates to a wireless distributed base station dynamic distributed antenna selection system and a method for realizing the same. Background technique

In a mobile communication system, a system is generally composed of a base station and a terminal. With the informatization of society, people are increasingly relying on networks and various multimedia data services. Moreover, they want to communicate with anyone and any organization at any time and any place. This requires the use of advanced technologies in broadband wireless communication systems. To meet the needs of humanity. For example, Multi Antenna (MAE) will be used in next-generation wireless communication systems (the next three generations / fourth generation B3G / 4G, wireless LAN WLAN, broadband wireless access BWA, mobile broadband wireless access MBWA, etc.) The widely used technology, but in this way, the implementation complexity and cost of the system increases linearly with the number of antennas used. Because in general, each transmitting antenna requires one transmitting channel, and each receiving antenna requires a receiving channel to cooperate with it. Compared to the antenna, the complexity and cost of the channel are much higher, especially for the transmission channel, which requires an expensive broadband high-power amplifier. In the case of high-speed wideband channels, the radio frequency (hereinafter referred to as RF) part of the cost is quite expensive.

In addition, since the new broadband wireless communication system requires a wider frequency band, it is necessary to implement wireless transmission in a frequency band higher than the current frequency, and it is generally considered to be 5 GHz or more according to the current situation. In these bands, the attenuation of radio wave propagation will be better than now. Wireless communication systems (eg 2 GHz and below) are much higher. Correspondingly, to achieve the same coverage, the former needs a much larger transmission power than the latter, which is uneconomical and unrealistic.

The current distributed antenna selection system can adopt the method of remote radio frequency. By deploying the antenna according to the specific natural environment of the cell, each antenna covers a relatively small range, so as to better solve the wireless transmission in the high frequency band. Big attenuation problem. However, the one-to-one correspondence between the antenna and the transceiver channel still cannot reduce the cost of the system, and the device resources cannot be optimally utilized, and the dynamically adjusted cell coverage cannot be obtained.

A method and apparatus for antenna selective transmit diversity is given in Chinese Patent Publication No. CN1499867A. The antenna selection method can reduce the system cost to a certain extent, but cannot meet the requirement of efficiently designing the cell coverage shape as needed, and can not solve the serious attenuation problem of wireless transmission in the high frequency band. Moreover, current antenna selection techniques do not adequately consider the type of service of each user and the degree of matching with the surrounding antenna groups in the case of multiple users, and therefore are not optimal for device resource allocation. Therefore, it is necessary to find a new antenna deployment solution. Summary of the invention

In view of the above circumstances, an object of the present invention is to provide a wireless communication base station dynamic distributed antenna selection system and an implementation method thereof.

The invention relates to a wireless communication base station dynamic distributed antenna selection system and an implementation method thereof, relating to a wireless communication base station dynamic distributed antenna selection system, and an efficient device resource configuration and cell coverage for the system by using an antenna selection method. To achieve the above object, a wireless communication base station dynamic distributed antenna selection system of the present invention is characterized in that it comprises an N-channel transmitter, an N-channel receiver and an antenna family consisting of K independent antenna units, wherein K is greater than N.

The above-mentioned antenna unit is in the form of satisfying the system requirements, and there is no corresponding limitation; the base station connected to the antenna family composed of the above K antenna elements is not limited to one, wherein the base station is composed of N transceiver channels.

To achieve the above object, a method for implementing a dynamic distributed antenna selection system for a wireless communication base station according to the present invention includes:

A base station composed of N transceiver channels uses a N-channel transmitter of the above base station and N antennas selected from K antenna units to form a distributed downlink transmission structure at the time of transmission; the base station receives K antennas at the time of reception. The unit uses N antennas and N receivers of the above base station to form a distributed receiving structure, so as to meet the severe attenuation of the high-band wireless transmission in the broadband wireless communication system, the relatively small area coverage and high data rate Business characteristics requirements;

Through proper antenna family deployment, it can be well matched with the natural environment of each specific cell, and cooperate with the corresponding antenna selection method to form a cell that best matches the service mode, achieve optimal resource allocation, and reduce transmission power requirements. And cost.

The N antennas corresponding to the transmitting channel and the N antennas corresponding to the receiving channel are overlapped under normal conditions, but may not overlap completely.

The deployment of the antenna family consisting of the above K antenna elements is determined by the natural environment of the specific cell. Where J=KN is the antenna redundancy of the distributed antenna system of the base station, and R=K/N is the redundancy; in engineering, the value of R is greater than 1, otherwise the cell specific cannot be realized efficiently. Molding and antenna selection; but generally less than 3 is enough.

In the case of multiple users, the antenna selection method includes the following steps: Step 1: The base station adopts an initial antenna deployment model to perform downlink broadcast paging on the cell, and the terminal feedbacks the matched antenna group at the location after receiving the information (Matching Antenna Group) (hereinafter referred to as MAG) and its associated Channel State Information (CSI) and/or Service Type (hereinafter referred to as ST) information to the base station;

Step 2: The base station performs cell antenna selection and antenna distribution according to the feedback information.

The MAG refers to an antenna set formed by an antenna that is closest to the user and has a good CSI and can better match the user service, where the value is 1 when the matching is good, and 0 when the matching is not, and The value is greater than 0 and less than 1 depending on the degree of matching.

The above CSI refers to information related to the characteristics of the air channel, wherein the value of the CSI is greater than 0 and less than 1, that is, when the channel quality from the antenna of the base station to the user is the best, the value is 1 and the worst is The value is 0.

The foregoing ST refers to the service type of the user, including whether it is a real-time service and a data rate, where the real-time service requires a value of 1, and the data service is from a large to a small data rate, and the value of the service type is close to 1 To 0.

The specific selection principle of the above step two is:

1) First meet users with real-time business requirements, such as voice service users;

2) Then select an antenna group with good CSI and large MAG to form a new dynamic cell. The above cell coverage refers to the following situations: Some areas have a large number of users, A large demand for communication capacity forms a so-called hot spot; in other places, the communication capacity may have been small, as long as it is covered, or some areas do not need to be covered at all. Therefore, a distributed antenna selection system is used to form cells having different communication capacity densities or shapes to meet such demands. However, in contrast to such statically shaped cells, in modern cities, hotspots often change dynamically according to people's activities. For example, during the day when people leave the house to go out, the residential area often has fewer users and communication capacity requirements; while the office area, business area, exhibition place, etc., due to crowds, there are a large number of users and antenna capacity requirements. In the evening, it may be the opposite. If both are deployed in a traditional system, designed to meet their maximum needs, of course, they can meet day and night needs, but obviously a large part of the equipment resources are wasted.

The deployment of the antenna family consisting of the above κ antenna elements is deployed according to the maximum communication capacity requirement of the area to be covered, but how many antennas are selected and which antennas are connected to the base station, dynamically change according to actual capacity requirements, and the above-mentioned cells can be formed. Hotspot coverage that requires large-capacity communication, and the hotspot area is not limited to one, and is dynamically changed. Through the antenna selection method described above, the distributed antenna family is dynamically selected to form a desired cell shape and capacity coverage.

In order to ensure that the antenna family satisfies the requirements of high communication capacity and the resource allocation is reduced when the communication capacity is low, the shape of the antenna family and the number of antenna elements κ must have certain requirements. The shape of the antenna family deployment includes a planar array, a circular array, a line array, or other forms of 2D and 3D arrays; the number K of antenna elements should be greater than the number N of transceivers, so that when the transceiver antenna unit is selected There is enough freedom. The form of the antenna unit itself is not limited, so as to meet the requirements of the system. The invention adopts a distributed antenna selection system in a base station of a wireless communication system, and solves the problem of large attenuation of wireless transmission in a high frequency band, and adopts a certain antenna family deployment and an antenna selection method to achieve optimal configuration of equipment resources. In the same station, a specific antenna family is used to achieve the required cell coverage. Moreover, compared with the traditional distributed antenna selection system, the implementation cost can be greatly reduced.

The above and other objects, features and advantages of the present invention will become more <RTIgt; DRAWINGS

1 is a composition diagram of a conventional multi-antenna base station system;

2 is a schematic diagram of a reference model of the distributed antenna selection system of the present invention; and FIG. 3 is a schematic diagram of an embodiment of the distributed antenna selection system of the present invention. detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. 1 is a composition diagram of a conventional multi-antenna base station system, which generally requires as many transmission and reception antenna units as the number of channels of the receiver and the transmitter, respectively. For example, in order to implement a Multi Input Multi Output (MIMO) system, each antenna needs to be connected to one transceiver; or in a general distributed antenna system, the same requirements are met. One of the biggest drawbacks of this system is that as the number of antennas increases, the cost of implementing the device will increase linearly. As shown in Fig. 1, 104 to 1N4 are antennas shared by N transceivers, and correspondingly, N transmitters and N receivers must be connected thereto. In wide In a wireless communication system, the cost of the transceiver, especially the radio frequency (RF) portion, is quite high. In the case of high radio frequencies that require seamless coverage of complex environments, a considerable number of antenna elements are required to form a distributed base station antenna system. As a result, the complexity and cost of the technology is too high. Moreover, due to the randomness of user distribution, a distributed system that meets the maximum demand is bound to have a considerable number of devices in a dynamic idle state, thereby causing waste of resource allocation of the system. 2 is a schematic diagram of a reference model of the distributed antenna selection system of the present invention. As shown in FIG. 2, the wireless communication base station 101 of the system having N transceiver channels transmits data to be transmitted through N antennas A1-AN of the K antenna elements A1-AK. The uplink information of multiple users is received through the same N antennas. This method can be used directly in the Time Division Duplex (hereinafter referred to as TDD) communication mode because the uplink and downlink channel characteristics of TDD are reciprocal. In the Frequency Division Duplex (FDD) mode, certain corrections are needed for the feedback information.

The above N antennas are selected from the above K antennas based on the antenna selection method of the present invention. It should be noted that this selection is determined by a combination of factors such as the environmental obstacle 102, the equal positional relationship of the user Ul-Ui and the K antennas, and the service type of U1-Ui. Which of the above K antennas is connected to the N base transceiver station is dynamic. There are always at least J=K-N redundant antennas that are not working.

3 is a schematic diagram of an embodiment of a distributed antenna selection system of the present invention. It should be noted that it is only a reference example. As shown in FIG. 3, the above antenna selection method includes the following steps: Step 1. Place K=20 antenna elements A1, Α2, ..., Α20, according to the cell communication user density, capacity, building and other factors to be covered, and deploy them into a distributed array as shown in Figure 3, and consist of 3 The base station 301 is connected thereto;

Step 2: The above antenna units A1 to Α9 can be uniformly covered by the cell, which is assumed to be a rectangle 302, and the base station and any user in the rectangular cell can complete the establishment of paging, channel and basic information through the base station;

Step 3: After completing the basic information search of the multi-user through step 2, the base station 301 can obtain information such as MAG, CSI, and ST, and provide preliminary information for dynamic distributed cell formation and antenna selection.

Step 4. Establish a preliminary connection, track user and channel dynamic changes, and form a criterion for antenna selection;

Step 5. Complete antenna selection according to the information described in steps 3 and 4 above. A dynamic elongated cell 303 is formed, and two hot spot areas 304 requiring a large capacity are formed in the cell. Antennas outside 303 are not selected. In 303, it is also possible that not all antennas are selected. For example, A3, A10, A13, and A17 are not selected, and the rest are selected. Step 6. Periodically repeat steps 3 through 5 above to implement dynamic antenna selection. The above is a detailed description of the working principle of the present invention, but this is merely a visual example for the purpose of understanding, and should not be construed as limiting the scope of the invention. Also, various possible modifications or substitutions may be made in accordance with the description of the technical solutions of the present invention and the preferred embodiments thereof, and all such changes or substitutions are intended to fall within the scope of the appended claims.

Claims

Rights request

A dynamic distributed base station selection system for a wireless communication base station, comprising: an N-way transmitter, an N-channel receiver, and an antenna family consisting of K independent antenna elements, wherein K is greater than N.

The system according to claim 1, wherein the antenna unit is in a form that satisfies the system requirements, and there is no corresponding limitation; the base station connected to the antenna family formed by the K antenna elements is not limited to one. The base station is composed of N transceiver channels.

A method for implementing a dynamic distributed antenna selection system for a wireless communication base station, comprising:

A base station composed of N transceiver channels forms a distributed downlink transmission structure by using an N-way transmitter of the base station and N antennas selected from K antenna units at the time of transmission;

The base station selects N antennas from the K antenna units and the N receivers of the base station to form a distributed receiving structure when receiving;

Through the antenna family deployment, and corresponding antenna selection methods, the cells that best match the service mode are formed.

The implementation method according to claim 3, wherein the N antennas corresponding to the transmitting channel and the N antennas corresponding to the receiving channel are overlapped or not completely overlapped.

5. The method according to claim 3, characterized in that said K days The deployment of the antenna family consisting of line units is determined by the natural environment of the specific cell, that is, it is deployed according to the maximum communication capacity requirement of the area to be covered, but how many antennas are selected and which antennas are connected to the base station according to actual capacity requirements. The dynamic change, and the hotspot coverage that requires large-capacity communication can be formed in the above-mentioned cell, and the hotspot area is not limited to one, and is dynamically changed.

The method according to claim 5, characterized in that the shape of the antenna family deployment comprises a planar array, a circular array, a line array or other forms of 2D and 3D.

The implementation method according to claim 3, characterized in that in the case of multiple users, the antenna selection method comprises the following steps:

Step 1: The base station adopts an initial antenna deployment model to perform downlink broadcast paging for the cell in which the terminal is located, and after receiving the information, the terminal feeds back the matched antenna group at the location and its associated channel state information and/or service type information to the base station;

8. The implementation method according to claim 7, wherein:

The matched antenna group refers to an antenna set which is closest to the user, has better channel state information, and can better match the user service, and the value is 1 when the matching is good, and the value when the matching is not matched. Is 0, and according to the degree of matching from small to large, its value is greater than 0 and less than 1;

The channel state information refers to information related to the characteristics of the air channel, where the value of the channel state information is greater than 0 and less than 1, that is, from an antenna of the base station to the top. When the user's channel quality is best, the value is 1 and the worst value is 0;

The service type refers to the service type of the user, including whether it is a real-time service and a data rate, where the real-time service requires a value of 1, and the data service is from a large to a small data rate, and the value of the service type is close to 1 to 0.

The implementation method according to claim 7, wherein the specific selection principle of the second step is -

1) First meet users with real-time business requirements;

2) Then select an antenna group with good channel state information and matching antenna groups to form a dynamic cell.