WO2013044754A1

WO2013044754A1 - Method for allocating csi-rs when multiple access points exist, base station, and access point

Info

Publication number: WO2013044754A1
Application number: PCT/CN2012/081720
Authority: WO
Inventors: 夏亮; 夏媛; 任晓涛
Original assignee: 华为技术有限公司
Priority date: 2011-09-29
Filing date: 2012-09-24
Publication date: 2013-04-04
Also published as: CN103037395A; CN103037395B

Abstract

The present invention provides a method for allocating a CSI-RS when multiple access points exist, a base station, and an access point. The method comprises: allocating an M-port CSI-RS pilot pattern to a cooperative UE, M being the sum of the numbers of antenna ports of K access points for cooperative transmission, and the M-port CSI-RS pilot pattern comprising K CSI-RS pilot patterns each having the number of ports being Nk; allocating the CSI-RS pilot patterns each having the number of ports being Nk to the kth access point, so that the kth access point sends a CSI-RS with non-zero power on the CSI-RS pilot pattern having the number of ports being Nk according to the cell ID of a main access point of the cooperative UE; sending allocation information of the CSI-RS with non-zero power to the cooperative UE, the allocation information at least comprising the M-port CSI-RS pilot pattern. By means of the embodiment of the present invention, the UE acquires CSI-RSs of multiple access points, so as to perform downlink CSI measurement for the multiple access points.

Description

Method, base station and access point for configuring CSI-RS when multiple access points are used

This application claims the priority of the Chinese application submitted to the China Patent Office on September 29, 2011, the application number is 201110294718.2, and the invention name is "CSI-RS method, base station and access point when multiple access points are configured". The entire contents of which are incorporated herein by reference. Technical field

The present invention relates to a wireless communication technology, and in particular, to a method, a base station, and an access point for configuring a channel state information reference signal (CSI-RS) when multiple access points are used. In a wireless communication system, in order for a user equipment (User Equipment, UE) to measure downlink channel state information (CSI), the base station needs to send a certain reference signal to the UE in the coverage area for CSI. measuring. For example, in the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) R10 protocol, a base station (eNodeB) needs to transmit a channel state information reference signal (CSI). -RS) The downlink CSI measurement is performed for the UE in the coverage area. At this time, the base station needs to notify the UE of the location information of the CSI-RS, so that the UE can acquire the CSI-RS. The base station may also perform data muting processing on the location where the strong interfering cell transmits the CSI-RS. At this time, the base station also needs to notify the UE of the data muting location information, and the UE assumes that the location has no data symbol transmission.

In the LTE R10 protocol, the location information of the CSI-RS may form different pilot patterns. For example, when the normal cyclic prefix is used, there are 8 types of 8-port CSI-RS pilot patterns, and each pilot pattern occupies 8 resource units ( Resource Element, RE); each 4-port CSI-RS pilot pattern is half of the 8-port CSI-RS pilot pattern, ie contains 16 4-port CSI-RS pilot patterns, each of which is 4 ports CSI-RS occupied 4 Similarly, each 2-port CSI-RS pilot pattern is half of the 4-port CSI-RS pilot pattern. However, the 1-port pilot pattern is the same as the 2-port pilot pattern, and the two are distinguished by a spreading code. In Coordinated Multiple Point Transmission and Reception (CoMP) technology, or in a Distributed Antenna System (DAS), multiple access points (APs) can be one or more at the same time. Users provide data services. At this time, the same UE needs to measure the CSI-RS of multiple access points. However, the existing CSI-RS configuration scheme is for a single access point, and does not provide a configuration scheme for multiple access points. The UE of the ingress service cannot identify the CSI-RS of the access point of the cooperative service, and cannot perform downlink CSI measurement of multiple access points. SUMMARY OF THE INVENTION The embodiments of the present invention provide a method, a base station, and an access point for configuring a CSI-RS when multiple access points are used. When multiple access points are served by the same UE, the UE can identify the service. The CSI-RS of each access point, in turn, measures the downlink CSI of multiple access points.

According to an aspect of the present invention, a method for configuring a CSI-RS when a plurality of access points includes: configuring an M-port CSI-RS pilot pattern for a coordinated user equipment UE, where M is K accesses for cooperative transmission The sum of the number of antenna ports of the point, the M port CSI-RS pilot pattern includes K CSI-RS pilot patterns with Nk ports respectively, Nk is the number of antenna ports of the kth access point, k=1 And ... K; respectively configuring a CSI-RS pilot pattern having a port number of Nk to the kth access point, such that the kth access point is in the CSI-RS pilot with the number of ports Nk Transmitting a non-zero power CS I-RS according to a cell ID of a primary access point of the coordinated UE;

Transmitting non-zero power CSI-RS configuration information to the cooperative UE, where the configuration information includes at least the M port CSI-RS pilot pattern.

According to another aspect of the present invention, a base station includes:

a configuration module, configured to configure, by the cooperative user equipment UE, an M port channel state information reference signal CSI-RS pilot pattern, where M is a sum of antenna port numbers of K access points that are cooperatively transmitted, and the M port CSI- The RS pilot pattern includes K CSI-RS pilot patterns with port numbers Nk, Nk is the number of antenna ports of the kth access point, k=1, ... K _;

An allocation module, configured to separately allocate a CSI-RS pilot pattern with a port number of Nk obtained by the configuration module to a kth access point, so that the kth access point is Nk at the port number Transmitting a non-zero power CSI-RS according to a cell ID of a primary access point of the coordinated UE on a CSI-RS pilot pattern; The first sending module is configured to send non-zero power CSI-RS configuration information to the coordinated UE, where the configuration information includes at least the M port CSI-RS pilot pattern obtained by the configuration module.

According to another aspect of the present invention, a method for configuring a CSI-RS when a plurality of access points includes: obtaining, by an access point having a port number of Nk, a CSI-RS pilot pattern configured by a base station and having a number of ports of Nk, The Nk is the number of the antenna ports of the access point, and the CSI-RS pilot pattern of the Nk is the one of the M-port pilot patterns configured by the base station for the cooperative user equipment UE, and the M-port pilot pattern is included. The K CSI-RS pilot patterns are respectively included, and the K CSI-RS pilot patterns are respectively allocated to K cooperative transmission access points;

The access point with the number of ports Nk sends a non-zero power CSI-RS according to the cell ID of the primary access point of the coordinated UE on the CSI-RS pilot pattern with the number of ports Nk.

According to another aspect of the present invention, an access point includes:

a first acquiring module, configured to acquire a channel state information reference signal CSI-RS pilot pattern of a port number configured by the base station, where Nk is an antenna port number of the access point, and the CSI-RS is the Nk port number The pilot pattern is one of the M-port pilot patterns configured by the base station for the coordinated user equipment UE, and the K pilot patterns included in the M-port pilot pattern are respectively configured for access to K cooperative transmissions. Point

And a sending module, configured to send, according to the cell ID of the primary access point of the coordinated UE, a non-zero power CSI-RS on the CSI-RS pilot pattern of the port number obtained by the acquiring module.

According to another aspect of the present invention, a system for configuring a CSI-RS when a plurality of access points includes the above-described base station and access point.

According to the foregoing technical solution, the embodiment of the present invention configures an M-port CSI-RS pilot pattern, where the M-port CSI-RS is configured for each cooperatively transmitted AP, and each AP is configured with a CSI-RS pilot. The CSI-RS is transmitted on the pattern by using the cell ID of the primary access point. The coordinated UE can use the cell ID of the primary access point to resolve the CSI-RS. Therefore, the coordinated UE can obtain the CSI-RS of each AP that is cooperatively transmitted. The identification of CSI-RSs of multiple APs is implemented, and the measurement of downlink CSIs of multiple APs can be completed. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the technical solutions in the embodiments of the present invention, a brief description of the drawings to be used in the description of the embodiments will be briefly described. For some embodiments of the present invention, other drawings may be obtained from those skilled in the art without any inventive labor.

1 is a schematic flow chart of a method according to a first embodiment of the present invention;

2 is a schematic flow chart of a method according to a second embodiment of the present invention;

3 is a schematic diagram of a CSI-RS pilot pattern of an access point A according to a second embodiment of the present invention; FIG. 4 is a schematic diagram of a CSI-RS pilot pattern of an access point B according to a second embodiment of the present invention; FIG. 5 is a schematic diagram of a CSI-RS pilot pattern of an access point C according to a second embodiment of the present invention; FIG. 6 is a schematic diagram of another CSI-RS pilot pattern of an access point A according to a second embodiment of the present invention; FIG. 7 is a schematic diagram of another CSI-RS pilot pattern of the access point B according to the second embodiment of the present invention; FIG. 8 is another CSI-RS pilot of the access point C according to the second embodiment of the present invention; FIG. 9 is a schematic flow chart of a method according to a third embodiment of the present invention;

FIG. 10 is a schematic diagram of a CSI-RS pilot pattern of an access point A at a time of 2ηΤ+Δ according to a third embodiment of the present invention; FIG.

FIG. 1 is a schematic diagram of a CSI-RS pilot pattern of an access point 2 at a time of 2ηΤ+Δ according to a third embodiment of the present invention; FIG.

FIG. 12 is a schematic diagram of a CSI-RS pilot pattern of an access point C at a time of 2ηΤ+Δ according to a third embodiment of the present invention; FIG.

13 is a schematic diagram of a CSI-RS pilot pattern of an access point A at a time of 2ηΤ+Τ+Δ according to a third embodiment of the present invention;

14 is a schematic diagram of a CSI-RS pilot pattern of an access point B at a time of 2ηΤ+Τ+Δ according to a third embodiment of the present invention;

15 is a schematic diagram of a CSI-RS pilot pattern of an access point C at a time of 2ηΤ+Τ+Δ according to a third embodiment of the present invention;

16 is a schematic structural diagram of a base station according to a fourth embodiment of the present invention;

17 is a schematic flow chart of a method according to a fifth embodiment of the present invention;

18 is a schematic structural diagram of an access point according to a sixth embodiment of the present invention;

FIG. 19 is a schematic structural diagram of a system according to a seventh embodiment of the present invention. detailed description The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope are the scope of the present invention.

FIG. 1 is a schematic flowchart of a method according to a first embodiment of the present invention, including:

Step 1: The base station configures an M-port CSI-RS pilot pattern for the coordinated UE, where M is the sum of the number of antenna ports of the K access points that are cooperatively transmitted, and the M-port CSI-RS pilot pattern includes K The number of ports is respectively Nk CSI-RS pilot pattern, Nk is the number of antenna ports of the kth access point, k=1, ... K.

In the embodiment of the present invention, a UE that needs to measure downlink CSI of at least two cooperatively transmitted access points or a UE that is served by at least two cooperatively transmitted access points is referred to as a Cooperative UE (CoMP UE).

At this time, an access point of the at least two cooperatively transmitted access points to send a common signaling such as a Physical Broadcast Channel (PBCH) to the coordinated UE is referred to as a primary access point, and the rest Access points participating in cooperative transmission are called cooperative access points.

The UE under the primary access point that only needs to measure the downlink CSI of the primary access point or the UE that is only served by the primary access point is referred to as a non-cooperating UE (non-CoMP UE) under the primary access point.

The cooperating UE and the non-cooperating UE under the primary access point have the cell ID of the primary access point.

The cooperatively transmitted access point may be a cell (specifically, a network side device that implements a coverage area), a base station corresponding to the cell, a remote radio head (RRH), and a radio remote unit (Radio Remote Unit, RRU) or Antenna Unit (AU).

Assuming that there are two access points for cooperative transmission, and the number of antenna ports per access point is 4, the above M is 8, that is, the base station configures an 8-port CSI-RS pilot pattern. The 8-port CSI-RS contains two 4-port CSI-RS pilot patterns.

Certainly, the number of cooperatively transmitted access points may also be greater than two. For example, four access points cooperatively transmit, and the number of antenna ports of each access point is two, then the above M is 8, and K is 4. , Nk is 2.

It can be understood that the above M, K, Nk can also take different values. Of course, in general, the number of antenna ports per access point should be 1, 2, 4, or 8, and M is usually 2, 4, or 8. Step 12: The base station separately allocates a CSI-RS pilot pattern with a port number of Nk to the kth access point, so that the kth access point is in the CSI-RS pilot pattern with the port number Nk. Transmitting a non-zero power CSI-RS according to a cell ID of a primary access point of the coordinated UE.

The transmitting the non-zero power CSI-RS according to the cell ID of the primary access point of the UE means that the sequence of the transmitted non-zero power CSI-RS is generated according to the cell ID of the primary access point of the coordinated UE.

Taking the two cooperative transmission access points as an example, one access point is the primary access point, and the other access point is called the cooperative access point, and the base station uses the above two 4-port CSI-RS pilots. The patterns are configured for the primary access point and the coordinated access point.

In addition, each access point in the existing single cell configuration scheme transmits its own CSI-RS according to the respective cell ID. However, in the embodiment of the present invention, a UE that is jointly served by multiple coordinated access points can identify CSI-RSs of all access points, whether it is a primary access point or a coordinated access point, in the above-mentioned 8-port CSI- The two 4-port CSI-RS pilot patterns obtained by the RS pilot pattern are respectively sent according to the cell ID of the primary access point, so that the UE can use its own cell ID to parse the corresponding access points. CSI-RS.

Step 13: The base station sends non-zero power CSI-RS configuration information to the coordinated UE, where the configuration information includes at least the M port CSI-RS pilot pattern.

The CSI-RS configuration information already defined in the LTE R10 protocol includes:

(1) Zero or one non-zero power CSI-RS configuration information, including: number of ports, pilot pattern, period, subframe offset;

(2) Zero, one or more zero-power CSI-RS configuration information, including: RE position, period, subframe offset.

The non-zero power CSI-RS configuration information may be used to indicate that the UE acquires a corresponding CSI-RS to measure downlink CSI.

The zero-power CSI-RS configuration information may be used to indicate that the UE acquires the data muting location, that is, the UE assumes that no data is transmitted at the location obtained according to the zero-power CSI-RS configuration information.

The K CSI-RS pilot patterns included in the M-port CSI-RS pilot pattern are respectively configured to transmit CSI-RSs to multiple access points, and the K CSI-RS pilot patterns are based on the primary connection. The cell ID of the ingress point transmits the CSI-RS, and the cooperating UE has the cell ID of the primary access point. Therefore, the cooperating UE can parse the CSI-RS on the K CSI-RS pilot patterns by using its own cell ID. Cooperative UE acquisition The CSI-RS of each access point for cooperative transmission can further measure the downlink CSI of multiple access points to meet the coordinated transmission requirements.

Further, in order to reduce interference between access point non-zero power CSI-RSs, one access point may transmit non-zero power CSI-RSs at other access points and the access point does not transmit non-zero power CSI-RSs A zero-power CSI-RS is transmitted on the pilot pattern. B, this embodiment can also further include:

The base station notifies the kth access point that the number of ports corresponding to the nth access point is Nn to the kth access point, so that the kth access point is in the CSI-RS with the port number Nn A zero-power CSI-RS is transmitted on the pilot pattern, where there is interference between the n-th access point and the k-th access point, n this embodiment is configured by configuring an M-port CSI-RS pilot pattern, The M-port CSI-RS is configured for each coordinated transmission AP, and each AP transmits the CSI-RS by using the cell ID of the primary access point on the configured CSI-RS pilot pattern, due to the primary access point The coordinated UE uses the cell ID of the primary access point to parse the CSI-RS. Therefore, the coordinated UE can acquire the CSI-RS of each AP that is cooperatively transmitted, and implement the CSI-RS of multiple APs, thereby completing the ij. Measurement of downlink CSI for multiple APs.

2 is a schematic flowchart of a method according to a second embodiment of the present invention, and FIG. 3 to FIG. 5 are schematic diagrams showing a CSI-RS pilot pattern of each access point according to a second embodiment of the present invention, and FIG. Another schematic diagram of a CSI-RS pilot pattern for each access point of the second embodiment.

This embodiment takes a normal cyclic prefix as an example, that is, as shown in Figures 3-8, each subframe contains 14 symbols. Of course, the embodiment of the present invention can also refer to execution when extending the cyclic prefix.

Since one base station generally corresponds to three cells in the case of wireless communication, the present embodiment takes three access points as an example, and any two of the three access points can perform cooperative transmission. Specifically, the embodiment includes the AP A, the AP B, and the AP C. The AP A and the AP B are cooperatively transmitted, the AP B and the AP C are cooperatively transmitted, and the AP C and the AP A are cooperatively transmitted.

In this embodiment, each access point is a 4-antenna port as an example.

Referring to FIG. 2, this embodiment includes:

Step 21: The base station configures an 8-port CSI-RS pilot pattern for the primary access point and the coordinated access point, and configures two 4-port CSI-RS pilot patterns included in the 8-port CSI-RS pilot pattern respectively. The primary access point and the coordinated access point are caused to cause the primary access point and the coordinated access point to transmit a non-zero power CSI-RS according to the cell ID of the primary access point on the corresponding 4-port CSI-RS pilot pattern. For example, referring to FIG. 3 to FIG. 5, when AP A and AP B are cooperatively transmitted and AP A is the primary access point, the 8-port CSI-RS pilot pattern configured for the coordinated UEs under AP A and AP B is {AO , A1, A2, A3, A4, A5, A6, A7}, where the 4-port pilot pattern configured for AP A is {AO, A1, A2, A3}, and the 4-port pilot pattern configured for AP B is {A4, A5, A6, A7}. AP A and AP B transmit respective non-zero power CSI-RSs according to the cell ID of AP A on {AO , A1, A2, A3} and {A4, A5, A6, A7}, respectively.

When AP B and AP C are cooperatively transmitted and AP B is the primary access point, the 8-port CSI-RS pilot pattern configured for the coordinated UEs under AP B and AP C is {B0, B1, B2, B3, B4, B5, B6, B7}, where the 4-port pilot pattern configured for AP B is {B0, B1, B2, B3}, and the 4-port pilot pattern configured for AP C is {B4, B5, B6, B7 }. AP B and AP C send their respective non-zero-power CSI-RSs according to the cell ID of AP B on {B0, B1, B2, B3} and {B4, B5, B6, B7}.

When AP C and AP A are cooperatively transmitted and AP C is the primary access point, the 8-terminal B CSI-RS pilot pattern configured for the coordinated UEs under AP C and AP A is {C0, C1, C2, C3, C4. , C5, C6, C7}, where the 4-port pilot pattern configured for AP C is {CO, C1, C2, C3}, and the 4-port pilot pattern configured for AP A is {C4, C5, C6, C7}. AP C and AP A send their respective non-zero power CSI-RSs according to the cell ID of AP C on { CO , C1 , C2 , C3 } and { C4 , C5 , C6 , C7 } respectively.

Further, in order to reduce interference between access points, a zero-power CSI-RS may be transmitted on the pilot pattern of the non-zero-power CSI-RS that does not transmit the non-zero-power CSI-RS transmitted by other access points. For example, AP A transmits zero-power CSI-RS at positions {A4, A5, A6, A7} and {CO, C1, C2, C3}; AP B is at {A0, A1, A2, A3} and {B4, A zero-power CSI-RS is transmitted at the position of B5, B6, B7}; AP C transmits a zero-power CSI-RS at the positions of {B0, B1, B2, B3} and {C4, C5, C6, C7}.

It should be noted that the pilot patterns shown in FIG. 3 to FIG. 5 are only an example, and may be allocated in other manners, for example, A0~A3 is configured to AP B, and A4~A7 is configured to AP A. Or, configure the 8-port pilot pattern configured for AP A and AP B to AP B and AP C.

The 4-port CSI-RS pilot pattern corresponding to the primary access point included in the 8-port CSI-RS pilot pattern is mainly for the coordinated UE, and the non-cooperative UE having the common primary access point with the coordinated UE , you can configure a 4-port CSI-RS. Of course, if the coordinated UE and the non-cooperative UE under the primary access point adopt the same 4-port configuration, the non-cooperative UE may not be specifically configured. Set. If the cooperative UE and the non-cooperative UE adopt different 4-port configurations, the base station may further configure another 4-port CSI-RS pilot pattern for the non-cooperative UE. For example, the 4-port CSI-RS pilot pattern of the corresponding cooperative UE included in the 8-port CSI-RS pilot pattern is referred to as a second 4-port CSI-RS pilot pattern, which will be configured for the non-cooperative UE of the primary access point. The 4-port CSI-RS pilot pattern is called the first 4-port pilot pattern. See Figure 6-8. When AP A, AP B, and AP C are the primary access points, the first 4-port CSI-RS guide. The frequency patterns are {AO, A1, A2, A3}, {BO, B1, B2, B3} and {CO, C1, C2, C3} _{; the} above 8-port CSI-RS pilot patterns are {a0, a1 respectively , a2, a3, a4, a5, a6, a7}, {b0, b1, b2, b3, b4, b5, b6, b7} and {b0, b1, b2, b3, b4, b5, b6, b7}, Gp , the second 4-port CSI-RS pilot patterns are {a0, a1, a2, a3}, {b0, b1, b2, b3} and {c0, c1, c2, c3}, respectively.

Step 22: The base station sends CSI-RS configuration information to the UE.

The non-zero-power CSI-RS configuration information sent by the base station to the non-cooperating UE of the primary access point includes at least a first 4-port CSI-RS pilot pattern.

The zero-power CSI-RS configuration information notified by the base station to the non-cooperating UE of the primary access point includes at least a primary access point for transmitting a non-zero power CSI-RS pilot pattern and a zero-power CSI-RS pilot pattern. A pilot pattern other than the first 4-port CSI-RS pilot pattern.

The non-zero power CSI-RS configuration information notified by the base station to the cooperative UE includes at least an 8-port CSI-RS pilot pattern.

For example, referring to FIG. 3 to FIG. 5, when the AP A and the AP B are cooperatively transmitted and the AP A is the primary access point, the non-zero power CSI-RS configuration information notified by the base station to the non-cooperating UE under the AP A includes at least {AO. , A1, A2, A3}; the zero-power CSI-RS configuration information notified to the non-cooperative UE under the AP A includes at least {A4, A5, A6, A7} and {C4, C5, C6, C7} _; The non-zero CSI-RS configuration information notified by the cooperative UE of A and AP B includes at least {AO, A1, A2, A3, A4, A5, A6, A7}. When AP B and AP C are the primary access points respectively, they can be notified in a similar manner.

Of course, the CSI-RS configuration information notified by the base station to the UE may include the number of ports, the period, and the subframe offset of the pilot pattern in addition to the pilot pattern described above.

In addition, the cooperative access point may acquire the cell ID of the primary access point from the primary access point in advance through an interface between the access points.

In this embodiment, by configuring an M port CSI-RS pilot pattern, the M port CSI-RS is configured for each APs that are cooperatively transmitted, and each AP sends a CSI-RS using the cell ID of the primary access point on the configured CSI-RS pilot pattern, because the coordinated UE uses the cell ID of the primary access point to resolve the CSI-RS. Therefore, the coordinated UE can obtain the CSI-RS of each AP that is cooperatively transmitted, realize the identification of the CSI-RSs of the multiple APs, and further complete the measurement of the downlink CSIs of the multiple APs.

In the previous embodiment, since the CSI-RS is transmitted according to the cell ID of the primary access point during cooperative transmission, if the UE under the coordinated access point needs to measure the CSI of the primary access point and the coordinated access point, The UE under the coordinated access point needs to be switched to the primary access point. For example, it is assumed that the AP A and the AP B are cooperatively transmitted, the AP A is the primary access point, and the AP B is the coordinated access point. At this time, the coordinated UE under the AP A can acquire the CSI-RS of the AP A and the AP B, but Since the cell ID used by the UE under the AP B is the cell ID of the AP B, it cannot resolve the CSI-RS transmitted by the cell ID of the AP A. To resolve, only the UE under the AP B can be switched to the AP A first. However, the handover may cause some overhead and delay. To this end, the next embodiment provides that the UEs under different access points can complete the acquisition of CSI-RSs of the two APs without handover.

FIG. 9 is a schematic flowchart of a method according to a third embodiment of the present invention, and FIG. 10 to FIG. 12 are schematic diagrams showing CSI-RS pilot patterns of each access point at time 2ηΤ+Δ according to a third embodiment of the present invention, and FIGS. 13-15 are A schematic diagram of a CSI-RS pilot pattern at each of the access points of the third embodiment of the present invention at 2nΤ+Τ+Δ.

Referring to Figure 9, this embodiment includes:

Step 91: The base station configures a first 4-port CSI-RS pilot pattern on the non-cooperating UE under the primary access point, where the primary access point is based on the cell of the primary access point on the first 4-port pilot pattern The ID transmits a non-zero power CSI-RS, and the period of the first 4-port CSI-RS pilot pattern is T, and the subframe offset is Δ.

For example, when the primary access point is AP ,, the first 4-port CSI-RS pilot pattern is {AO, A1, A2, A3}; when the primary access point is AP B, the first 4-port CSI is described above. The -RS pilot pattern is {B0, B1, B2, B3}; when the primary access point is AP C, the first 4-port CSI-RS pilot pattern is {CO, C1, C2, C3}.

Step 92: The base station configures a first 8-port CSI-RS pilot pattern for the first coordinated UE, and configures two 4-port CSI-RS pilot patterns included in the first 8-port CSI-RS pilot pattern to The primary access point and the first neighboring access point, such that the primary access point and the first neighboring access point are on the corresponding 4-port CSI-RS pilot pattern according to the primary access point The cell ID transmits a non-zero power CSI-RS, and the period of the first 8-port CSI-RS pilot pattern is 2T, and the subframe offset is Δ.

The first coordinated UE is required to measure the downlink of the primary access point and the first adjacent access point. The UE of the CSI or the UE that can be served by the primary access point and the first neighboring access point, the first coordinated UE and the primary access point of the non-cooperative UE are the same.

It is assumed that the 4-port CSI-RS pilot pattern configured for the primary access point is the second 4-port CSI-RS pilot pattern, and the 4-port CSI-RS pilot pattern configured for the first neighboring access point is The three 4-port, and the second 4-port CSI-RS pilot pattern are the same as the first 4-port pilot pattern. Certainly, as described in the foregoing embodiment, when the two are the same, the configuration may not be specifically configured, that is, when the second 4-port CSI-RS pilot pattern and the first 4-port pilot pattern are the same, the step may not be performed. 91.

For example, referring to FIG. 10 to FIG. 12, when the primary access point is AP A and the first neighboring access point is AP B, the 8-port CSI-RS pilot pattern configured for the coordinated UEs under AP A and AP B, That is, the first 8-port CSI-RS pilot pattern configured for the first coordinated UE is {AO, A1, A2, A3, A4, A5, A6, A7}, wherein the 4-port pilot pattern configured for AP A is {AO, A1, A2, A3}, and the 4-port pilot pattern configured for AP B is {A4, A5, A6, A7} ₀ AP A and AP B are divided into another ij at {A0, A1, A2, A3} And on {A4, A5, A6, A7}, the respective non-zero power CSI-RSs are transmitted according to the cell ID of the AP A.

When the primary access point is AP B and the first neighboring access point is AP C, the 8-port CSI-RS pilot pattern configured for the coordinated UEs under AP B and AP C is the first configured for the first coordinated UE. An 8-port CSI-RS pilot pattern is {B0, B1, B2, B3, B4, B5, B6, B7}, wherein the 4-port pilot pattern configured for AP B is {B0, B1, B2, B3} The 4-port pilot pattern configured for AP C is {B4, B5, B6, B7}. AP B and AP C are assigned ij on {B0, B1, B2, B3} and {B4, B5, B6, B7}, and send their respective non-zero power CSI-RS according to the cell ID of AP B.

When the primary access point is the AP C and the first neighboring access point is the AP A, the 8-port CSI-RS pilot pattern configured for the coordinated UEs in the AP C and the AP A is the first configured by the first coordinated UE. An 8-port CSI-RS pilot pattern is {CO, C1, C2, C3, C4, C5, C6, C7}, where the 4-port pilot pattern configured for AP C is {CO, C1, C2, C3} The 4-port pilot pattern configured for AP A is {C4, C5, C6, C7}. AP C and AP A transmit their respective non-zero-power CSI-RSs according to the cell ID of the AP C on {CO, C1, C2, C3} and {C4, C5, C6, C7}.

Further, in order to reduce interference between access points, a zero-power CSI-RS may be transmitted on the pilot pattern of the non-zero-power CSI-RS that is not transmitted by the other access point. For example, AP A transmits zero-power CSI-RS at positions {A4, A5, A6, A7} and {CO, C1, C2, C3}; AP B is at {A0, A1, A2, A3} and {B4, Location of B5, B6, B7} Zero power CSI-RS is transmitted on; AP C transmits zero power CSI-RS at positions of {B0, B1, B2, B3} and {C4, C5, C6, C7}.

It should be noted that the pilot patterns shown in FIG. 10 to FIG. 12 are only an example, and may be allocated in other manners, for example, A0~A3 is configured to AP B, and A4~A7 is configured to AP A. Or, configure the 8-port pilot pattern of the above configuration to AP A and AP B to AP B and AP C.

In addition, the second 4-port CSI-RS pilot pattern and the first 4-port CSI-RS pilot pattern allocated in this embodiment may also be different, that is, the pilot pattern sent in each sending moment in this embodiment may also adopt a map. 6 to the configuration scheme shown in Figure 8.

Step 93: The base station configures a second 8-port CSI-RS pilot pattern for the second coordinated UE, and configures two 4-port CSI-RS pilot patterns included in the second 8-port CSI-RS pilot pattern to The primary access point and the second adjacent access point, such that the primary access point and the second adjacent access point are on the corresponding 4-port CSI-RS pilot pattern according to the primary access point The cell ID transmits a non-zero power CSI-RS, and the period of the second 8-port CSI-RS pilot pattern is 2T, and the subframe offset is Τ+Δ.

The second coordinated UE is a UE that needs to measure downlink CSI of the primary access point and the second neighboring access point, or a UE that can be served by the primary access point and the second neighboring access point. The primary cooperative UE and the non-cooperative UE have the same primary access point.

The 4-port CSI-RS pilot pattern configured for the primary access point is a fourth 4-port CSI-RS pilot pattern, and the 4-port CSI-RS pilot pattern configured for the second adjacent access point is Five 4 ports.

For example, referring to FIG. 13 to FIG. 15, when the primary access point is AP A and the second adjacent access point is AP C, the 8-port CSI-RS pilot pattern configured for the coordinated UEs under AP A and AP C, That is, the second 8-port CSI-RS pilot pattern configured for the second coordinated UE is {AO, A1, A2, A3, A4, A5, A6, A7}, wherein the 4-port pilot pattern configured for AP A is {AO, A1, A2, A3}, and the 4-port pilot pattern assigned to AP C is {A4, A5, A6, A7}. AP A and AP C send their respective non-zero-power CSI-RSs according to the cell ID of AP A on {AO, A1, A2, A3} and {A4, A5, A6, A7}.

When the primary access point is ΑΡ Β and the first neighboring access point is AP A, the 8-port CSI-RS pilot pattern configured for the coordinated UEs under AP B and AP A is configured for the second coordinated UE. The two 8-port CSI-RS pilot patterns are {B0, B1, B2, B3, B4, B5, B6, B7}, wherein the 4-port pilot pattern configured for AP B is {B0, B1, B2, B3} The 4-port pilot pattern configured for AP A is {B4, B5, B6, B7}. AP B and AP AP are divided into another ij in [B0, B1, B2, B3} and B{B4, B5, On B6, B7}, the respective non-zero power CSI-RSs are transmitted according to the cell ID of the AP B.

When the primary access point is the AP C and the second neighboring access point is the AP B, the 8-port CSI-RS pilot pattern configured for the coordinated UEs under the AP C and the AP B is configured as the second coordinated UE. The two 8-port pilot patterns are {CO, C1, C2, C3, C4, C5, C6, C7}, wherein the 4-port pilot pattern configured for AP C is {CO, C1, C2, C3}, and the configuration The 4-port pilot pattern for AP B is {C4, C5, C6, C7}. 〇 and on the {〇0, C1, C2, C3} and {C4, C5, C6, C7}, respectively, send their respective non-zero power CSI-RS according to the cell ID of the AP C.

In order to ensure that the access point transmits the same pilot pattern of non-zero power CSI-RS or zero-power CSI-RS at the time of 2ηΤ+ Δ and 2ηΤ+Τ+ Δ (η=0,1,2,...), The access point transmits the pilot pattern of the non-zero power CSI-RS at the time of 2ηΤ+ Δ and 2ηΤ+Τ+Δ, and the access point is not transmitted at the moment when the access point does not transmit the non-zero power CSI at the time of 2ηΤ+Δ A zero-power CSI-RS is transmitted on the pilot pattern of the RS, and the access point transmits a zero-power CSI-RS on the pilot pattern in which the non-zero-power CSI-RS is not transmitted at the moment 2 Τ Τ + Τ + Δ.

In addition, the first 8-port CSI-RS pilot pattern and the second 8-port pilot pattern may be the same or different, and between the second _4- port pilot pattern, the fourth 4-port pilot pattern, and the first 4-port pilot pattern The third 4-port pilot pattern and the fifth 4-port pilot pattern may be the same or different, the same or different.

Further, in order to reduce interference between access points, a zero-power CSI-RS may be transmitted on the pilot pattern of the non-zero-power CSI-RS that does not transmit the non-zero-power CSI-RS transmitted by other access points. For example, in order to reduce interference with the third 4-port CSI-RS pilot pattern and the non-zero-power CSI-RS on the fifth 4-port CSI-RS pilot pattern, at 2ηΤ+Τ+Δ, the primary access point And/or the first neighboring access point transmits a zero-power CSI-RS on the fifth 4-port CSI-RS pilot pattern, and at 2ηΤ+Δ, the primary access point and/or the second adjacent access point are A zero-power CSI-RS is transmitted on the third 4-port CSI-RS pilot pattern.

It should be noted that the pilot patterns given in FIG. 10 to FIG. 15 are only an example, and may also be allocated in other manners, for example, configuring a third 4-port CSI-RS pilot pattern to the primary access point, and second. The 4-port CSI-RS pilot pattern is configured to the first neighboring access point; the fifth 4-port CSI-RS pilot pattern may also be configured to the primary access point, and the fourth 4-port CSI-RS pilot pattern is configured. Give the second adjacent access point.

The specific configuration of the pilot pattern may be as follows. Referring to FIG. 10 to FIG. 15, a schematic diagram of the pilot pattern of the embodiment is given, wherein {AO, A1, A2, A3, A4, A5, A6, A7} are based on AP A The cell IDs are sent to the corresponding CSI-RSs, {BO, B1, B2, B3, B4, B5, B6, B7}, and the corresponding CSI-RSs, {CO, C1, C2, are sent according to the cell ID of the AP B. C3, C4, C5, C6, and C7} transmit respective CSI-RSs according to the cell ID of the AP C.

Taking AP A as an example, the first 4-port CSI-RS pilot pattern is {AO, A1, A2, A3}, the period is T, the subframe offset is Δ; the first 8-port CSI of AP A and AP B- The RS pilot pattern is {AO, A1, A2, A3, A4, A5, A6, A7}, the second 4-port CSI-RS pilot pattern is {AO, A1, A2, A3}, the third 4-port CSI- The RS pilot pattern is {A4, A5, A6, A7}, the period of the first 8-port CSI-RS pilot pattern is 2T, the subframe offset is Δ; the second 8-port pilot pattern of AP Α and AP C For {AO, A1, A2, A3, A4, A5, A6, A7}, the fourth 4-port CSI-RS pilot pattern is {AO, A1, A2, A3}, the fifth 4-port CSI-RS pilot pattern For {A4, A5, A6, A7}, the period of the second 8-port CSI-RS pilot pattern is 2T, and the subframe offset is Τ+Δ.

At ηΤ+ Δ, Haiij (n=0,1,2,...), AP A transmits a non-zero power CSI-RS according to the cell ID of AP A on {A0, A1, A2, A3}; + Δ时海ij, AP B transmits non-zero power CSI-RS according to the cell ID of AP A on {A4, A5, A6, A7}; Haij, AP C at {A4, A5 at 2ηΤ+Τ+ Δ , A6, A7} sends a non-zero power CSI-RS according to the cell ID of AP A.

At 2ηΤ+ Δ and 2ηΤ+Τ+ Δ, ij, AP A is a union of the pilot patterns transmitting non-zero power CSI-RS, ie in {AO, A1, A2, A3, B4, B5, B6, Transmitting non-zero power CSI-RS on B7, C4, C5, C6, C7}; transmitting zero-power CSI-RS on {B4, B5, B6, B7} at 2ηΤ+ Δ; at 2ηΤ+ Τ+ Δ时海ij, AP A transmits a zero-power CSI-RS on {C4, C5, C6, C7}.

Step 94: The base station notifies the UE of the CSI-RS configuration information.

The non-zero-power CSI-RS configuration information that is notified by the base station to the non-cooperating UE includes at least a first 4-port CSI-RS pilot pattern of the primary access point, and a period T of the non-zero-power CSI-RS configuration. Frame offset Δ.

The zero-power CSI-RS configuration information notified by the base station to the non-cooperating UE includes at least a first 4-port CSI in the non-zero-power CSI-RS pilot pattern and the zero-power CSI-RS pilot pattern included in the primary access point. - a pilot pattern other than the RS pilot pattern, a period T of the zero-power CSI-RS configuration, and a subframe offset of eight.

The non-zero-power CSI-RS configuration information that the base station notifies the first coordinated UE includes at least a first 8-port CSI-RS pilot pattern, a period 2T of a non-zero-power CSI-RS configuration, and a subframe offset to the second coordinated UE. The notified non-zero power CSI-RS configuration information includes at least a second 8-port CSI-RS pilot map Case, period 2T of non-zero power CSI-RS configuration, subframe offset Τ + Δ.

In this embodiment, three access points are used for coordinated transmission, and two access points adjacent to each primary access point are used as an example, or at least three access points adjacent to each primary access point may be used. In this case, it may be that: the number of the CSI-RS pilot patterns of the port is L, and each M port CSI-RS pilot pattern is respectively allocated to the primary access point and an adjacent connection. The in-point, and the subframe offsets of the two M-port CSI-RS pilot patterns are sequentially different by one cycle, where L is the number of access points adjacent to each primary access point. For example, AP A can be coordinated with AP B, AP C, and AP D respectively. AP A is the primary access point, and the number of antenna ports per access point is 4. Then, three 8-port CSI-RS guides are configured. a frequency pattern, wherein the first 8-port CSI-RS pilot pattern is configured to AP A and AP B at time t1, and the second 8-port CSI-RS pilot pattern is configured to AP A, AP C at time t1 +T, and third The 8-port CSI-RS pilot pattern is configured for AP A and AP D at time t1 + 2T.

In this embodiment, the M-port CSI-RS pilot pattern is configured, and the M-port CSI-RS is configured for each cooperatively transmitted AP, and each AP adopts a primary access on the configured CSI-RS pilot pattern. The CSI-RS is transmitted by the cell ID of the point, and the coordinated UE of the primary access point resolves the CSI-RS by using the cell ID of the primary access point. Therefore, the coordinated UE can acquire the CSI-RS of each AP that is cooperatively transmitted, and implements the pair. The CSI-RSs of the multiple APs can be used to measure the downlink CSI of multiple APs. In this embodiment, by configuring the CSI-RSs at different times, the UEs in different access points can obtain the CSI-RSs of the cooperatively transmitted APs.

The second and third embodiments are exemplified by four antenna ports. Of course, the above method can also be applied to the case where each access point is one antenna port or two antenna ports. For example, when each access point is a 2-antenna port, the 4-port CSI-RS pilot pattern in the above embodiment is replaced with a 2-port pilot pattern, and the 8-port pilot pattern is replaced with a 4-port pilot pattern. When each access point is 1 antenna port, the 4-port CSI-RS pilot pattern in the above embodiment is replaced with a 1-port pilot pattern, and the 8-port pilot pattern is replaced with a 2-port pilot pattern.

It should be noted that in the LTE R10 protocol, the 1-port CSI-RS pilot pattern and the 2-port CSI-RS pilot pattern use the same RE, but the spreading codes used are different. Specifically, the 1-port CSI-RS pilot pattern uses a spreading code [1, 1], and the first port of the 2-port CSI-RS uses a spreading code [1, 1], and the second port of the 2-port CSI-RS is used. Spreading code [1, -1]. In this case, the 2-port CSI-RS pilot pattern may include two parts, a 1-port CSI-RS pilot pattern with a spreading code of [1, 1] and a 1-port with a spreading code of [1, -1]. CSI-RS Pilot pattern. At this time, the corresponding second or fourth 1-port CSI-RS pilot pattern is a 1-port CSI-RS pilot pattern with a spreading code of [1, 1], and a third or fifth 1-port CSI-RS pilot. The frequency pattern is the spreading code

1-port CSI-RS pilot pattern for [1,-1].

FIG. 16 is a schematic structural diagram of a base station according to a fourth embodiment of the present invention. The base station may be a device that performs the foregoing method, where the base station includes a configuration module 161, an allocation module 162, and a first sending module 163. The configuration module 161 is configured to configure a coordinated UE. The M-port CSI-RS pilot pattern, where M is the sum of the number of antenna ports of the K access points cooperatively transmitted, and the M-port CSI-RS pilot pattern includes K CSI-RSs with Nk ports respectively a pilot pattern, Nk is the number of antenna ports of the kth access point, k=1, . . . K _{; the} allocation module 162 is configured to respectively obtain the CSI-RS pilot pattern of the number of ports obtained by the configuration module by Nk Configuring to the kth access point, so that the kth access point sends non-zero power according to the cell ID of the primary access point of the coordinated UE on the CSI-RS pilot pattern with the port number Nk The CSI-RS is configured to send the non-zero-power CSI-RS configuration information to the coordinated UE, where the configuration information includes at least the M-port CSI-RS pilot pattern obtained by the configuration module.

The method may further include: a notification module, configured to notify, to the kth access point, a CSI-RS pilot pattern with a number of ports corresponding to the nth access point obtained by the configuration module, so that the kth The access point sends a zero-power CSI-RS on the CSI-RS pilot pattern with the port number Nn, where there is interference between the n-th access point and the k-th access point, n≠ k.

The first port of the CSI-RS pilot pattern includes a first N1 port CSI-RS pilot pattern, and the first N1 port CSI-RS pilot pattern is a pilot configured for the primary access point. a pattern, where N1 is the number of antenna ports of the primary access point, the base station further includes a second sending module, where the second sending module is configured to: send non-zero power CSI-RS configuration information to the non-cooperating UE of the primary access point. And transmitting, by the non-zero-power CSI-RS configuration information sent by the non-cooperating UE of the primary access point, the first N1 port CSI-RS pilot pattern; and transmitting the zero-power CSI to the non-cooperating UE of the primary access point. RS configuration information, where the zero-power CSI-RS configuration information includes at least a first non-zero power CSI-RS and a zero-power CSI-RS pilot pattern except the first N1 port CSI-RS pilot pattern. CSI-RS pilot pattern

Or the second port of the CSI-RS pilot pattern includes a second N1 port CSI-RS pilot pattern, where the second N1 port CSI-RS pilot pattern is a pilot pattern configured for the primary access point. N1 is the number of antenna ports of the primary access point, the base station further includes a third sending module, and the third sending module Used for:

And configuring a first N1 port CSI-RS pilot pattern, where the first N1 port CSI-RS pilot pattern is different from the second N1 port CSI-RS pilot pattern;

Transmitting the non-zero-power CSI-RS configuration information to the non-cooperating UE of the primary access point, and the non-zero-power CSI-RS configuration information sent to the non-cooperating UE of the primary access point includes at least the first N1 port CSI-RS Pilot pattern

Transmitting zero-power CSI-RS configuration information to the non-cooperating UE of the primary access point, where the zero-power CSI-RS configuration information includes at least a non-zero power CSI-RS and a zero-power CSI-RS pilot pattern. a pilot pattern other than the first N1 port CSI-RS pilot pattern.

In one embodiment, the number of the M-port CSI-RS pilot patterns configured by the configuration module is L, where the L is the number of access points adjacent to the access point, and each The M-port CSI-RS pilot patterns are respectively allocated to the primary access point and one adjacent access point, and the subframe offsets of the two M-port CSI-RS pilot patterns are sequentially different by one cycle.

In an embodiment, the second sending module is specifically configured to send non-zero power CSI-RS configuration information to the non-cooperating UE of the primary access point, and send the non-zero power CSI-RS to the non-cooperating UE of the primary access point. The configuration information includes at least an N1 port CSI-RS pilot pattern, a period T, and a subframe offset Δ; and transmits zero-power CSI-RS configuration information to the non-cooperating UE of the primary access point, where the zero-power CSI-RS configuration information is at least Included in the CSI-RS pilot pattern except the N1 port CSI-RS pilot pattern in the non-zero power CSI-RS and zero-power CSI-RS pilot pattern, the period T, the subframe offset Δ ;

At this time, the first sending module is specifically configured to send non-zero power CSI-RS configuration information to the first coordinated UE of the primary access point, and send the non-zero power CSI-RS to the first coordinated UE of the primary access point. The configuration information includes at least a first M-port CSI-RS pilot pattern, a period 2T, and a subframe offset Δ, where the first coordinated UE is a UE that needs to measure downlink CSI of the primary access point and the first neighboring access point. Or a UE served by the primary access point and the first neighboring access point; transmitting non-zero power CSI-RS configuration information to the second coordinated UE of the primary access point, and transmitting the information to the first coordinated UE of the primary access point The non-zero-power CSI-RS configuration information includes at least a second M-port CSI-RS pilot pattern, a period 2T, and a subframe offset Τ+Δ, where the second coordinated UE needs to measure the primary access point and the second neighbor. The UE of the downlink CSI of the access point or the UE served by the primary access point and the second neighboring access point.

In this embodiment, by configuring an M port CSI-RS pilot pattern, the M port CSI-RS is configured for each APs that are cooperatively transmitted, and each AP sends a CSI-RS using the cell ID of the primary access point on the configured CSI-RS pilot pattern, because the coordinated UE of the primary access point uses the cell of the primary access point. The ID resolves the CSI-RS. Therefore, the coordinated UE can obtain the CSI-RS of each AP that is cooperatively transmitted, implements the CSI-RS of the multiple APs, and can complete the measurement of the downlink CSI of multiple APs. .

FIG. 17 is a schematic flowchart of a method according to a fifth embodiment of the present invention, including:

Step 171: The access point with the number of ports Nk acquires a CSI-RS pilot pattern with the number of ports configured by the base station, where Nk is the number of antenna ports of the access point, and the number of ports is Nk CSI-RS The pilot pattern is one of the M-port pilot patterns configured by the base station for the coordinated UE, where the M-port pilot pattern includes K CSI-RS pilot patterns, and the K CSI-RS pilot patterns Access points that are separately configured for K cooperative transmissions;

Step 172: The access point with the port number Nk sends a non-zero power CSI-RS according to the cell ID of the primary access point of the coordinated UE on the CSI-RS pilot pattern with the port number Nk.

The M-port CSI-RS pilot pattern includes a second N1 port CSI-RS pilot pattern, and the second N1 port, if the access point with the port number Nk is the primary access point. The CSI-RS pilot pattern is a pilot pattern corresponding to the primary access point, and N1 is the number of antenna ports of the primary access point, and the method further includes:

Acquiring a first N1 port CSI-RS pilot pattern configured by the base station, and transmitting a non-zero power CSI-RS by using a cell ID of the primary access point on the first N1 port CSI-RS pilot pattern, where An N1 port CSI-RS pilot pattern is different from the second N1 port CSI-RS pilot pattern.

In an embodiment, the M-port CSI-RS pilot pattern includes a first M-port CSI-RS pilot pattern and a second M-port CSI-RS pilot pattern, and the first M-port CSI-RS pilot pattern And configured to the primary access point and the first neighboring access point, where the second M-port CSI-RS pilot pattern is configured to the primary access point and the second adjacent access point, the first M port The period of the CSI-RS pilot pattern is 2T, the subframe offset is Δ, the period of the second port CSI-RS pilot pattern is 2Τ, and the subframe offset is Τ+Δ, the first port is The CSI-RS pilot pattern and the second port CSI-RS pilot pattern include the same N1 port CSI-RS pilot pattern of the corresponding primary access point, where N1 is the number of antenna ports of the primary access point, The period of the N1 port CSI-RS pilot pattern is T, and the subframe offset is Δ.

At this time, the sending, according to the cell ID of the primary access point, the non-zero-power CSI-RS on the CSI-RS pilot pattern with the port number of Nk includes: If the access point with the number of ports is Nk is the primary access point, send a non-zero power CSI-RS according to the cell ID of the primary access point on the Ν1 port CSI-RS pilot pattern at the time of ηΤ+Δ;

Or,

If the access point with the number of ports Nk is the first neighboring access point, the non-zero power CSI is sent according to the cell ID of the primary access point on the Ν2 port CSI-RS pilot pattern at the time of 2ηΤ+Δ. -RS, where N2 is the number of antenna ports of the first neighboring access point;

Or,

If the access point with the number of ports Nk is the second neighboring access point, the Bay ij is at 2ηΤ+Τ+Δ, and the cell ID of the primary access point is on the N3 port CSI-RS pilot pattern. A non-zero power CSI-RS is transmitted, where N3 is the number of antenna ports of the second neighboring access point.

Further, if the access point with the number of ports is Nk is the primary access point, the method further includes: sending the non-zero power in the parallel time at the corresponding time at the time of 2ηΤ+Δ or 2ηΤ+Τ+Δ On the CSI-RS pilot pattern of the CSI-RS, a zero-power CSI-RS is transmitted, where the union is the time at which the primary access point is at 2ηΤ+Δ and 2ηΤ+Τ+Δ, for transmitting non-zero power CSI-RS The union of CSI-RS pilot patterns.

Of course, if the current access point is not the primary access point, the cell ID of the primary access point may be obtained from the primary access point through the inter-access point interface.

In this embodiment, the M-port CSI-RS pilot pattern is configured, and the M-port CSI-RS is configured for each cooperatively transmitted AP, and each AP adopts a primary access on the configured CSI-RS pilot pattern. The CSI-RS is transmitted by the cell ID of the point, and the coordinated UE of the primary access point resolves the CSI-RS by using the cell ID of the primary access point. Therefore, the coordinated UE can acquire the CSI-RS of each AP that is cooperatively transmitted, and implements the pair. The CSI-RSs of the multiple APs can be used to measure the downlink CSI of multiple APs.

FIG. 18 is a schematic structural diagram of an access point according to a sixth embodiment of the present invention, including a first obtaining module 181 and a sending module 182. The first acquiring module 181 is configured to acquire a CSI-RS pilot pattern with a port number of Nk configured by a base station. The Nk is the number of antenna ports of the access point, and the CSI-RS pilot pattern of the port number of Nk is one of the M port pilot patterns configured by the base station for the coordinated UE, and the M port guide The frequency pattern includes K CSI-RS pilot patterns, which are respectively configured for K cooperative transmission access points; and the sending module 182 is configured to acquire the The CSI-RS pilot pattern with the number of ports is Nk, and is sent according to the cell ID of the primary access point of the coordinated UE. Send a non-zero power CSI-RS.

In an embodiment, if the access point is a primary access point, the M-port CSI-RS pilot pattern includes a second N1 port CSI-RS pilot pattern, and the second N1 port CSI-RS guide The frequency pattern is a pilot pattern corresponding to the primary access point, and N1 is the number of antenna ports of the primary access point, and the access point further includes:

a second acquiring module, configured to acquire a first N1 port CSI-RS pilot pattern configured by the base station, and send a CSI-RS by using a cell ID of the primary access point on the first N1 port CSI-RS pilot pattern The first N1 port CSI-RS pilot pattern is different from the second N1 port CSI-RS pilot pattern.

In an embodiment, the M-port CSI-RS pilot pattern includes a first M-port CSI-RS pilot pattern and a second M-port CSI-RS pilot pattern, and the first M-port CSI-RS pilot pattern And configured to the primary access point and the first neighboring access point, where the second M-port CSI-RS pilot pattern is configured to the primary access point and the second adjacent access point, the first M port The period of the CSI-RS pilot pattern is 2T, the subframe offset is Δ, the period of the second port CSI-RS pilot pattern is 2Τ, and the subframe offset is Τ+Δ, the first port is The CSI-RS pilot pattern and the second port CSI-RS pilot pattern include the same N1 port CSI-RS pilot pattern of the corresponding primary access point, where N1 is the number of antenna ports of the primary access point, The period of the N1 port CSI-RS pilot pattern is T, and the subframe offset is Δ, and the sending module is specifically configured to:

If the access point is the primary access point, send a non-zero power CSI-RS according to the cell ID of the primary access point on the Ν1 port CSI-RS pilot pattern at the time of ηΤ+Δ;

Or,

If the access point is the first neighboring access point, transmitting a non-zero power CSI-RS according to the cell ID of the primary access point on the N2 port CSI-RS pilot pattern when 2ηΤ+Δ, N2 is the number of antenna ports of the first neighboring access point;

Or,

Further, if the access point is a primary access point, the sending module is further configured to: at a time of 2ηΤ+Δ or 2ηΤ+Τ+Δ, send non-zero power in the combined set at the corresponding time On the CSI-RS pilot pattern of the CSI-RS, a zero-power CSI-RS is transmitted, where the union is the time at which the primary access point is at 2ηΤ+Δ and 2ηΤ+Τ+Δ, for transmitting non-zero power CSI-RS The union of CSI-RS pilot patterns.

FIG. 19 is a schematic structural diagram of a system according to a seventh embodiment of the present invention, including a base station 191 and an access point 192. The base station 191 can be as shown in FIG. 16, and the access point can be as shown in FIG. 18.

It can be understood that related features in the above methods and devices can be referred to each other. Further, "first", "second", and the like in the above embodiments are used to distinguish the embodiments, and do not represent the advantages and disadvantages of the embodiments.

A person skilled in the art can understand that some steps of implementing the foregoing method embodiments may be performed by using hardware related to program instructions, such as a chip, a processor, etc., and the foregoing program may be stored in a computer readable storage medium. When the program is executed, the steps including the foregoing method embodiments are performed; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

Claim

A method for configuring a channel state information reference signal CSI-RS when a plurality of access points are provided, comprising:

Configuring an M-port CSI-RS pilot pattern for the coordinated user equipment UE, where M is the sum of the number of antenna ports of the K access points cooperatively transmitted, and the M-port CSI-RS pilot pattern includes K ports respectively Nk CSI-RS pilot pattern, Nk is the number of antenna ports of the kth access point, k=1,... K;

Configuring a CSI-RS pilot pattern with a port number of Nk to the kth access point, respectively, such that the kth access point is on the CSI-RS pilot pattern with the port number Nk according to the collaboration. The cell ID of the primary access point of the UE sends a non-zero power CSI-RS;

2. The method according to claim 1, further comprising:

Notifying the kth access point that the number of ports corresponding to the nth access point is Nn to the kth access point, so that the kth access point is in the CSI-RS guide with the port number Nn A zero-power CSI-RS is transmitted on the frequency pattern, wherein there is interference between the n-th access point and the k-th access point, n≠k.

The method according to claim 1 or 2, wherein the M port CSI-RS pilot pattern includes a first N1 port CSI-RS pilot pattern, and the first N1 port CSI-RS guide The frequency pattern is a pilot pattern configured for the primary access point, and N1 is the number of antenna ports of the primary access point, and the method further includes: transmitting a non-zero power CSI-RS configuration to the non-cooperating UE of the primary access point. Information, the non-zero-power CSI-RS configuration information sent to the non-cooperative UE of the primary access point includes at least the first N1 port CSI-RS pilot pattern;

Transmitting zero-power CSI-RS configuration information to the non-cooperating UE of the primary access point, where the zero-power CSI-RS configuration information includes at least a non-zero power CSI-RS and a zero-power CSI-RS pilot pattern. a CSI-RS pilot pattern other than the first N1 port CSI-RS pilot pattern.

The method according to claim 1 or 2, wherein the M port CSI-RS pilot pattern includes a second N1 port CSI-RS pilot pattern, and the second N1 port CSI-RS guide The frequency pattern is a pilot pattern configured for the primary access point, and N1 is the number of antenna ports of the primary access point, the method further includes: configuring a first N1 port CSI-RS pilot pattern, the first N1 The port CSI-RS pilot pattern is different from the second N1 port CSI-RS pilot pattern; Transmitting non-zero-power CSI-RS configuration information to the non-cooperating UE of the primary access point, where the transmitting non-zero-power CSI-RS configuration information to the primary access point includes at least the first N1 port CSI- RS pilot pattern;

The method according to claim 1 or 2, the number of the M-port CSI-RS pilot patterns is L, and each M-port CSI-RS pilot pattern is respectively allocated to the primary access The subframe and one neighboring access point, and the subframe offsets of the two M-port CSI-RS pilot patterns are sequentially different by one cycle, where L is the number of neighboring access points of the primary access point.

The method according to claim 5, wherein the primary access point is cooperatively transmitted with the first neighboring access point and the second neighboring access point, respectively, the M port CSI-RS pilot The pattern includes a first M-port CSI-RS pilot pattern and a second M-port CSI-RS pilot pattern, the first M-port CSI-RS pilot pattern being configured to the primary access point and the first adjacent access Point, the second M-port CSI-RS pilot pattern is configured to the primary access point and the second neighboring access point, and the period of the first M-port CSI-RS pilot pattern is 2T, and the subframe is biased The shift to Δ, the period of the second chirp port CSI-RS pilot pattern is 2Τ, and the subframe offset is Τ+Δ.

The method according to claim 6, wherein the first port CSI-RS pilot pattern and the second M port CSI-RS pilot pattern comprise the same N1 port CSI of the corresponding primary access point. a -RS pilot pattern, where N1 is the number of antenna ports of the primary access point, the period of the C1-RS pilot pattern of the N1 port is T, and the subframe offset is Δ, the method further includes:

At ηΤ+ΔΔ, the primary access point transmits a non-zero power CSI-RS according to the cell ID of the primary access point on the N1 port CSI-RS pilot pattern;

At a time of 2ηΤ+Δ, the first neighboring access point transmits a non-zero power CSI-RS according to the cell ID of the primary access point on the Ν2 port CSI-RS pilot pattern, where N2 is the first neighboring access point. The number of antenna ports; at 2ηΤ+Τ+Δ, the second neighboring access point transmits a non-zero power CSI-RS according to the cell ID of the primary access point on the N3 port CSI-RS pilot pattern, where N3 is the number of antenna ports of the second adjacent access point.

8. The method according to claim 7, further comprising:

At the time of 2ηΤ+ Δ or 2ηΤ+Τ+ Δ, the primary access point does not transmit the non-corresponding time in the union. Zero-power CSI-RS is transmitted on the CSI-RS pilot pattern of the zero-power CSI-RS, where the union is the time at which the primary access point is at 2ηΤ+Δ and 2ηΤ+Τ+Δ, for transmitting non-zero power CSI - The union of the CSI-RS pilot patterns of the RS.

The method according to claim 7 or 8, further comprising:

Transmitting non-zero-power CSI-RS configuration information to the non-cooperating UE of the primary access point, where the non-zero-power CSI-RS configuration information includes at least an N1 port CSI-RS pilot pattern, a period T, and a subframe offset Δ;

Transmitting zero-power CSI-RS configuration information to the non-cooperating UE of the primary access point, the zero-power CSI-RS configuration information including at least the primary access point for transmitting non-zero-power CSI-RS and zero-power CSI-RS pilot a CSI-RS pilot pattern in the pattern other than the N1 port CSI-RS pilot pattern, period T, subframe offset Δ; transmitting non-zero power CSI-RS configuration information to the first coordinated UE of the primary access point, The transmitting the non-zero-power CSI-RS configuration information to the first coordinated UE of the primary access point includes at least a first M-port CSI-RS pilot pattern, a period 2T, and a subframe offset Δ, where the first coordinated UE is a UE that needs to measure downlink CSI of the primary access point and the first neighboring access point or a UE served by the primary access point and the first neighboring access point;

Transmitting non-zero power CSI-RS configuration information to the second coordinated UE of the primary access point, where the transmitting the non-zero power CSI-RS configuration information to the first coordinated UE of the primary access point includes at least the second M-port CSI-RS a pilot pattern, a period 2T, a subframe offset Τ+Δ, where the second coordinated UE is a UE that needs to measure downlink CSI of the primary access point and the second neighboring access point or is used by the primary access point and UE served by the second neighboring access point.

10. The method according to claim 6, wherein if the number of antenna ports of each access point is 1, a 1-port CSI-RS guide configured to the primary access point and the first adjacent access point The frequency pattern, or the spreading codes corresponding to the 1-port CSI-RS pilot patterns configured for the primary access point and the second adjacent access point are [1, 1] and [1, -1], respectively.

A base station, comprising:

a configuration module, configured to configure, by the cooperative user equipment UE, an M port channel state information reference signal CSI-RS pilot pattern, where M is a sum of antenna ports of K access points that are cooperatively transmitted, and the M port CSI- The RS pilot pattern includes K CSI-RS pilot patterns with port numbers Nk, Nk is the number of antenna ports of the kth access point, k=1, ... K _;

An allocation module, configured to separately allocate, to the kth access point, a CSI-RS pilot pattern with a port number of Nk obtained by the configuration module, so that the kth access point is Nk at the port number Transmitting a non-zero power CSI-RS according to a cell ID of a primary access point of the coordinated UE on a CSI-RS pilot pattern; The first sending module is configured to send non-zero power CSI-RS configuration information to the coordinated UE, where the configuration information includes at least the M port CSI-RS pilot pattern obtained by the configuration module.

The base station according to claim 11, further comprising:

a notification module, configured to notify, to the kth access point, a CSI-RS pilot pattern with a number of ports corresponding to the nth access point obtained by the configuration module, so that the kth access point is The zero-power CSI-RS is transmitted on the CSI-RS pilot pattern with the number of ports Nn, where there is interference between the n-th access point and the k-th access point, n≠k.

The base station according to claim 1 or 12, wherein the M-port CSI-RS pilot pattern includes a first N1 port CSI-RS pilot pattern, and the first N1 port CSI-RS The pilot pattern is a pilot pattern configured for the primary access point, and N1 is the number of antenna ports of the primary access point, and the base station further includes a second sending module, where the second sending module is configured to:

Transmitting non-zero-power CSI-RS configuration information to the non-cooperating UE of the primary access point, where the transmitting non-zero-power CSI-RS configuration information to the primary access point includes at least the first N1 port CSI- RS pilot pattern;

The base station according to claim 1 or 12, wherein the M-port CSI-RS pilot pattern includes a second N1 port CSI-RS pilot pattern, and the second N1 port CSI-RS The pilot pattern is a pilot pattern configured for the primary access point, and N1 is the number of antenna ports of the primary access point, and the base station further includes a third sending module, where the third sending module is configured to:

The base station according to claim 1 or 12, wherein the number of the M-port CSI-RS pilot patterns configured by the configuration module is L, and each M-port CSI-RS guide The frequency patterns are respectively allocated to the primary access point and one adjacent access point, and the subframe offsets of the two M-port CSI-RS pilot patterns are sequentially different by one cycle, where L is the primary access point The number of adjacent access points.

16. The base station according to claim 12, characterized in that

The second sending module is configured to send non-zero power CSI-RS configuration information to the non-cooperating UE of the primary access point, where the non-zero power CSI-RS configuration information includes at least an N1 port CSI-RS pilot pattern, and the period T, subframe offset Δ; transmitting zero-power CSI-RS configuration information to the non-cooperating UE of the primary access point, the zero-power CSI-RS configuration information including at least the primary access point for transmitting non-zero-power CSI-RS And a CSI-RS pilot pattern other than the N1 port CSI-RS pilot pattern in the zero-power CSI-RS pilot pattern, period T, subframe offset Δ;

The first sending module is specifically configured to send non-zero power CSI-RS configuration information to the first coordinated UE of the primary access point, where the first coordinated UE of the primary access point sends non-zero power CSI-RS configuration information. At least a first M-port CSI-RS pilot pattern, a period 2T, and a subframe offset Δ, where the first coordinated UE is a UE or a UE that needs to measure downlink CSI of the primary access point and the first neighboring access point The primary access point and the UE served by the first neighboring access point; transmitting non-zero power CSI-RS configuration information to the second coordinated UE of the primary access point, where the first coordinated UE to the primary access point The transmitting non-zero power CSI-RS configuration information includes at least a second M-port CSI-RS pilot pattern, a period 2T, and a subframe offset Τ+Δ, where the second coordinated UE needs to measure the primary access point and the second phase. a UE that is adjacent to the downlink CSI of the ingress or a UE served by the primary access point and the second neighboring access point.

The access point of the port number Nk acquires a CSI-RS pilot pattern of the number of ports configured by the base station, where Nk is the number of antenna ports of the access point, and the CSI-RS pilot pattern of the port number is Nk is The base station is configured to include one of the M-port pilot patterns configured by the coordinated user equipment UE, where the M-port pilot pattern includes K CSI-RS pilot patterns, and the K CSI-RS pilot patterns are respectively configured to K cooperative transmission access points;

The access point with the number of ports Nk transmits a non-zero power CSI-RS according to the cell ID of the primary access point of the coordinated UE on the CSI-RS pilot pattern with the number of ports Nk.

The method according to claim 17, wherein if the access point with the number of ports Nk is the primary access point, the M-port CSI-RS pilot pattern includes a second N1 port. a CSI-RS pilot pattern, where the second N1 port CSI-RS pilot pattern is a pilot pattern corresponding to the primary access point, and N1 is the number of antenna ports of the primary access point, and the method further includes:

Obtaining a first N1 port CSI-RS pilot pattern configured by the base station, and transmitting a non-zero power CSI-RS by using a cell ID of the primary access point on the first N1 port CSI-RS pilot pattern, where An N1 port CSI-RS pilot pattern is different from the second N1 port CSI-RS pilot pattern.

The method according to claim 17 or 18, wherein the M-port CSI-RS pilot pattern comprises a first M-port CSI-RS pilot pattern and a second M-port CSI-RS pilot pattern, The first M-port CSI-RS pilot pattern is configured to a primary access point and a first neighboring access point, and the second M-port CSI-RS pilot pattern is configured to a primary access point and a second a neighboring access point, a period of the first M-port CSI-RS pilot pattern is 2T, a subframe offset is Δ, and a period of the second Μ port CSI-RS pilot pattern is 2T, and the subframe is biased Moving to Τ+Δ, the first M-port CSI-RS pilot pattern and the second M-port CSI-RS pilot pattern include the same N1 port CSI-RS pilot pattern of the corresponding primary access point, where, N1 The number of antenna ports of the primary access point, the period of the C1-RS pilot pattern of the N1 port is T, and the subframe offset is Δ.

Transmitting the non-zero-power CSI-RS according to the cell ID of the primary access point on the CSI-RS pilot pattern with the port number of Nk, including:

If the access point with the number of ports is Nk is the primary access point, send a non-zero power CSI-RS according to the cell ID of the primary access point on the Ν1 port CSI-RS pilot pattern at the time of ηΤ+Δ;

Or,

If the access point with the number of ports Nk is the first neighboring access point, then at 2ηΤ+Δ, the ij is transmitted on the N2 port CSI-RS pilot pattern according to the cell ID of the primary access point. Power CSI-RS, where

N2 is the number of antenna ports of the first adjacent access point;

Or,

If the access point with the number of ports Nk is the second neighboring access point, the Bay ij is at 2ηΤ+Τ+Δ, and the cell ID of the primary access point is on the N3 port CSI-RS pilot pattern. Sending a non-zero power CSI-RS, where

N3 is the number of antenna ports of the second adjacent access point.

20. The method according to claim 19, wherein if the number of ports is Nk The inbound point is the primary access point, and the method further includes:

At the time of 2ηΤ+Δ or 2ηΤ+Τ+Δ, the zero-power CSI-RS is transmitted on the CSI-RS pilot pattern that does not transmit the non-zero-power CSI-RS at the corresponding time, where the union is the primary access. The point is 2 Τ Τ + ΔHai ij and 2 Τ Τ + Τ + Δ hai ij, the union of CSI-RS pilot patterns for transmitting non-zero power CSI-RS.

21. An access point, comprising:

And a sending module, configured to send a non-zero power CSI-RS according to the cell ID of the primary access point of the coordinated UE, on the CSI-RS pilot pattern of the port number obtained by the acquiring module.

The access point according to claim 21, wherein if the access point is a primary access point, the primary access point included in the M-port CSI-RS pilot pattern corresponds to The pilot pattern is a second N1 port CSI-RS pilot pattern, and N1 is the number of antenna ports of the primary access point, and the access point further includes: a second acquiring module, configured to acquire a first N1 port CSI configured by the base station a RS pilot pattern, and transmitting, on the first N1 port CSI-RS pilot pattern, a CSI-RS by using a cell ID of the primary access point, the first N1 port CSI-RS pilot pattern and the second The N1 port CSI-RS pilot pattern is different.

The access point according to claim 21 or 22, wherein the M-port CSI-RS pilot pattern comprises a first M-port CSI-RS pilot pattern and a second M-port CSI-RS pilot pattern, a first M-port CSI-RS pilot pattern is configured for the primary access point and the first neighboring access point, and the second M-port CSI-RS pilot pattern is configured for the primary access point and the second neighbor The access point, the period of the first M-port CSI-RS pilot pattern is 2T, the subframe offset is Δ, the period of the second port CSI-RS pilot pattern is 2Τ, and the subframe offset is Τ+ Δ, the first port CSI-RS pilot pattern and the second port CSI-RS pilot pattern include the same N1 port CSI-RS pilot pattern of the corresponding primary access point, where N1 is dominant The number of the antenna ports of the access point, the period of the CSI-RS pilot pattern of the N1 port is T, and the subframe offset is Δ, and the sending module is specifically configured to:

If the access point is the primary access point, at the time η Τ + Δ, the Ν1 port CSI-RS pilot pattern Transmitting a non-zero power CSI-RS according to the cell ID of the primary access point; or

If the access point is the first neighboring access point, transmitting a non-zero power CSI-RS according to the cell ID of the primary access point on the Ν2 port CSI-RS pilot pattern at a time of 2ηΤ+Δ, where N2 is the number of antenna ports of the first adjacent access point; or

The access point according to claim 23, wherein, if the access point is a primary access point, the sending module is further configured to: hai or 2ηΤ+Τ+ Δ when 2ηΤ+ Δ When the convergence is not in the CSI-RS pilot pattern of the non-zero power CSI-RS transmitted at the corresponding time, the zero-power CSI-RS is transmitted, wherein the union is the main access point at 2ηΤ+Δ and 2ηΤ+ Τ+ Δ moment, the union of CSI-RS pilot patterns used to transmit non-zero power CSI-RS.

25. A system for configuring a CSI-RS when a plurality of access points are configured to include:

A base station according to any one of claims 1 to 16 and

An access point as claimed in any of claims 21-24.