CN102065465B

CN102065465B - Method, system and device for transmitting data

Info

Publication number: CN102065465B
Application number: CN 200910238153
Authority: CN
Inventors: 王启星; 刘建军; 徐晓东; 史志华; 刘光毅
Original assignee: China Mobile Communications Group Co Ltd
Current assignee: China Mobile Communications Group Co Ltd
Priority date: 2009-11-17
Filing date: 2009-11-17
Publication date: 2013-11-06
Anticipated expiration: 2029-11-17
Also published as: CN102065465A

Abstract

The embodiment of the invention discloses a method, a system and a device for transmitting data. The method comprises the following steps that: network side equipment can determine a channel information measurement set of UE (User Equipment) and obtain symbol positions corresponding to CSI-RS of cells in the channel information measurement set; the network side equipment performs slotting for data resource particles REs of symbol positions corresponding to CSI-RSs of other cooperative cells, except a serving cell of the UE, in the channel information measurement set; and the network side equipment obtains REs used by data to be received by the UE in a resource block RB according to the slotted REs, and transmits data to the UE according to the REs used by the data to be received by the UE. In the embodiment of the invention, by slotting the data REs corresponding to the CSI-RS pilot frequency symbols in the channel information measurement set, the interference of data symbols of adjacent cells in the channel information measurement set on CSI-RS pilot frequency symbols is effectively reduced or avoided, thereby improving the transmission performance of down links.

Description

Data transmission method, system and equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method, a system, and a device for transmitting data.

Background

LTE (Long Term Evolution) is the Evolution of 3G (3rd Generation, third Generation mobile communication system), and LTE improves and enhances the 3G over-the-air access technology, and adopts OFDM (Orthogonal Frequency Division Multiplexing) and MIMO (Multiple Input Multiple Output) as standards for wireless network Evolution. In an LTE-a (LTE-Advanced ) system, an OFDMA (orthogonal frequency Division Multiple Access) Access method is adopted, so that information of users in a cell is carried on different subcarriers that are orthogonal to each other, thereby avoiding Multiple Access interference between users.

However, the OFDMA access scheme itself does not have the capability of suppressing inter-cell interference, and interference affecting the performance of the LTE-a system mainly comes from interference between adjacent cells, that is, between cells. In the LTE-a system, in order to obtain a higher spectrum utilization rate, the mobile communication system performs network deployment in a way of co-frequency networking as much as possible.

In a mobile communication system (cellular system) of the same-frequency networking, users at the edge of a cell will be interfered by signals of adjacent cells, and the interference of the signals of the adjacent cells will severely limit the service quality and the throughput of the users at the edge of the cell. As shown in fig. 1, the serving base station for user 1 is base station 1, the serving base station for user 2 is base station 2, and the serving base station for user 3 is base station 3.

For downlink, user 1 will receive the useful signal of base station 1 and receive the interfering signals of

base stations

2 and 3; similarly, the user 2 will receive the useful signal of the base station 2 and receive the interference signals of the

base stations

1 and 3; the user 3 will receive the useful signal of the base station 3 and will receive the interfering signals of the

base stations

1 and 2.

It can be seen that, the signals transmitted by the base station 1, the base station 2 and the base station 3, the user 1, the user 2 and the user 3 can all receive at the same time, so that interference is caused between cells.

In order to solve the problem of interference caused among cells, the base station 1, the base station 2 and the base station 3 can jointly transmit signals to the user 1, the user 2 and the user 3 in a cooperative mode, and then the interference signals are suppressed, so that the interference among the cells can be effectively reduced, and the signal receiving signal-to-noise ratio of each user is improved.

Specifically, a CoMP (Coordinated Multi-point Transmission) system refers to that multiple base stations cooperate to transmit weighted user signals together after differently weighting the user signals, so as to improve the service quality and throughput of cell edge users and improve the spectrum utilization of the system.

As shown in fig. 2, the coordinated multi-point transmission system is a coordinated multi-point transmission system with three static base stations, wherein a base station 1, a base station 2, and a base station 3 form a coordinated base station cluster, and a user 1, a user 2, and a user 3 form a coordinated user group, that is, the base station 1, the base station 2, the base station 3, the user 1, the user 2, and the user 3 together form a virtual MIMO system.

In the downlink, signals for user 1, user 2 and user 3 are first pre-processed and then jointly transmitted through base station 1, base station 2 and base station 3. After the signal preprocessing operation, the interference signals of the

users

2 and 3 are suppressed in the signals received by the user 1; similarly, the interference signals of the user 1 and the user 3 are suppressed in the signal received by the user 2; the interference signals of the user 1 and the user 2 are suppressed in the signals received by the user 3.

It can be seen that base station 1, base station 2, and base station 3 transmit signals to user 1, user 2, and user 3 in a cooperative manner, thereby solving the problem of interference caused between cells.

Specifically, the CoMP system in fig. 2 is a case where three base stations cooperate statically, that is, three fixed base stations (base station 1, base station 2, and base station 3) form a cooperative base station cluster and cooperate to provide downlink data transmission for a cooperative user group.

In addition, the CoMP system can also perform dynamic cooperation, that is, the selection of the cooperative base station is determined by the performance of each user, each user can select a plurality of base stations with the best channel quality for receiving useful signals, and the cooperative base station can also dynamically select the interference signal with the strongest interference for eliminating; at this time, the cooperative base station clusters selected by each user may overlap with each other, and the corresponding performance is the same as the static cooperation of the base stations, which improves the performance, but the scheduling complexity is high.

In the prior art, the process of sending downlink data in the mobile communication system is shown in fig. 3, and includes the following steps:

step 301, a base station side notifies a User Equipment (UE) of a Radio Resource Management (RRM) measurement set; alternatively, the UE itself has a priori knowledge of the RRM measurement set.

Step 302, the UE measures an RSRP (Reference signal receiving Power) value or an RSRQ (Reference signal receiving Quality) value of the cell included in the RRM measurement set, and reports the RSRP value or the RSRQ value to the base station.

Step 303, the base station side determines the serving base station of the UE according to the reporting result of the UE. Where each UE has only one serving base station.

In step 304, the base station side notifies the UE of the determined serving base station.

In step 305, the UE measures the channel state information of the serving base station and feeds back the channel state information to the serving base station.

Step 306, the serving base station performs resource scheduling and allocation according to the channel state information fed back by the UE.

Step 307, the serving base station determines resource elements RE used when scheduling the UE, where the RE is located in a resource block RB and is used to send data to be received by the UE.

Specifically, when selecting the RE used for UE scheduling from the RB, the RE occupied by a PDCCH (physical downlink Control Channel) and the RE occupied by a pilot symbol of the serving base station need to be avoided.

And step 308, the serving base station sends downlink data to the UE by using the determined REs used by the UE scheduling.

In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:

as shown in fig. 4, a schematic diagram of pilot distribution of neighboring cells corresponding to a non-coordinated multi-point transmission system, where 14 OFDM Symbols × 12 sub-carriers corresponding to each base station are a resource block RB, and each small cell (i.e., 1 OFDM symbol × 1 sub-carrier) in the resource block RB is a resource element RE.

When data to be received by the UE is transmitted on the RE scheduled by the serving base station for the UE, the REs occupied by the PDCCH (first 2 or 3 OFDM symbols of Subframe) and the REs occupied by the serving base station pilot symbols (common pilot CRS, dedicated pilot UE-specific RS) are avoided. According to the existing LTE protocol, CRS and UE-specific RS of neighboring cells need to perform frequency shifting on frequency domain resources according to CellID of a base station, so as to avoid strong interference of pilots of neighboring base stations on the same RE resources. Frequency shifting can avoid strong interference of the pilots of the adjacent base stations on the same RE, but cannot avoid interference of the data REs of the adjacent base stations on the pilot symbol of the current base station.

As shown in fig. 4, at the RE position of the pilot symbol transmitted by base station 1, both base station 2 and base station 3 transmit Data (Data), that is, the interference of the Data RE of the neighboring base station to the pilot symbol of current base station 1 may degrade the performance of channel estimation of base station 1.

Similarly, the same problem exists with the coordinated multipoint transmission system shown in fig. 2. The LTE-a system needs to define a new pilot reference signal for implementing CSI (Channel State Information) measurement for an LTE-a user, where the pilot reference signal is a CSI-RS and is Cell-specific, and the CSI-RS between adjacent cells has shifting on one resource according to a Cell ID (the shifting of the CSI-RS may occur in a time domain or a frequency domain), so as to avoid strong interference of the CSI-RS of adjacent base stations on the same RE resource. If the existing Data transmission mode is adopted, the interference of the Data RE of the adjacent base station to the CSI-RS pilot symbol of the current base station can not be avoided, and the CSI-RS channel measurement is seriously influenced.

Disclosure of Invention

Embodiments of the present invention provide a data transmission method, system, and device, so as to avoid interference of data REs on CSI-RS and improve channel measurement quality of CSI-RS.

In order to achieve the above object, an embodiment of the present invention provides a data transmission method, including the following steps:

the method comprises the steps that network side equipment determines a channel information measurement set of User Equipment (UE) and obtains a symbol position corresponding to a pilot frequency reference signal (CSI-RS) of a cell in the channel information measurement set;

the network side equipment punches the data Resource Elements (REs) at the symbol positions corresponding to the CSI-RSs of other cooperative cells except the serving cell where the UE is located in the channel information measurement set;

and the network side equipment acquires the RE used by the data to be received by the UE in the resource block RB according to the punched RE, and sends the data to the UE according to the RE used by the data to be received by the UE.

Preferably, the puncturing, by the network side device, the data resource elements REs at symbol positions corresponding to CSI-RSs of other cooperating cells, other than the serving cell where the UE is located, in the channel information measurement set includes:

the network side equipment punches data REs at symbol positions corresponding to CSI-RSs of all cooperative cells except a serving cell where the UE is located in the channel information measurement set; or,

and the network side equipment punches the data RE at the symbol position corresponding to the CSI-RS of the partial cooperative cell except the serving cell where the UE is located in the channel information measurement set.

Preferably, the obtaining, by the network side device, REs used by the UE for data to be received in the resource block RB according to the punctured REs includes:

and the network side equipment acquires the RE used by the UE for receiving the data from the non-punched RE resource in the RB.

Preferably, the obtaining, by the network side device, REs used by the UE to receive data from non-punctured RE resources in the RB specifically includes:

and the network side equipment avoids the RE occupied by the PDCCH in the RB and the RE occupied by the pilot frequency symbol, and obtains the RE used by the UE to receive the data from the non-punched RE resource in the RB.

Preferably, the sending data to the UE according to the REs used by the UE to receive the data includes:

the network side equipment sends CSI-RS to the UE by using the symbol position corresponding to the CSI-RS of the cell where the UE is located, and sends data to the UE by using the RE corresponding to the data to be received of the UE.

A system for transmitting data, comprising:

the network side equipment is used for determining a channel information measurement set of the UE and acquiring a symbol position corresponding to a CSI-RS of a cell in the channel information measurement set; puncturing data REs at symbol positions corresponding to CSI-RSs of other cooperative cells except the serving cell where the UE is located in the channel information measurement set; acquiring RE used by the UE data to be received in an RB according to the RE after punching, and sending data to the UE by using the RE used by the UE data to be received;

and the UE is used for receiving the data from the network side equipment on the RE used by the UE to receive the data.

A transmission apparatus of data, comprising:

the determining module is used for determining a channel information measurement set of the UE and acquiring a symbol position corresponding to a CSI-RS of a cell in the channel information measurement set;

a processing module, configured to puncture data REs at symbol positions corresponding to CSI-RSs of other cooperating cells, other than the serving cell where the UE is located, in the channel information measurement set determined by the determining module;

an obtaining module, configured to obtain, in an RB according to the RE that is punctured by the processing module, an RE used by the UE for data to be received;

and the transmission module is used for sending data to the UE according to the RE used by the data to be received of the UE acquired by the acquisition module.

Preferably, the processing module is specifically configured to puncture data REs at symbol positions corresponding to CSI-RSs of all cooperating cells other than the serving cell where the UE is located in the channel information measurement set; or,

and puncturing data REs at symbol positions corresponding to CSI-RSs of partial cooperative cells except the serving cell where the UE is located in the channel information measurement set.

Preferably, the obtaining module is specifically configured to obtain REs used by the UE for receiving data from non-punctured RE resources in the RB.

Preferably, the obtaining module is further configured to avoid REs occupied by the PDCCH and REs occupied by the pilot symbols in the RB, and obtain REs used by the UE for data to be received from non-punctured RE resources in the RB.

Preferably, the transmission module is specifically configured to send the CSI-RS to the UE by using a symbol position corresponding to the CSI-RS of a cell in which the UE is located, and send data to the UE by using an RE corresponding to data to be received by the UE.

Compared with the prior art, the invention has the following advantages: by perforating data RE (data RE) at the position corresponding to the CSI-RS pilot symbols of the cells in the channel information measurement set, the interference of the data symbols of the adjacent cells in the channel information measurement set on the CSI-RS pilot symbols is effectively reduced or avoided, and the transmission performance of a downlink is improved.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings used in the description of the present invention or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some drawings of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without inventive labor.

Fig. 1 is a schematic diagram of a mobile communication system in the prior art;

fig. 2 is a schematic diagram of a coordinated multi-point transmission system during static coordination among three base stations in the prior art;

fig. 3 is a schematic diagram illustrating a process of transmitting downlink data in a mobile communication system in the prior art;

fig. 4 is a schematic diagram illustrating pilot frequency distribution of neighboring cells in a non-coordinated multi-point transmission system in the prior art;

fig. 5 is a flowchart of a data transmission method according to an embodiment of the present invention;

fig. 6 is a flowchart of a data transmission method proposed in a specific application scenario according to an embodiment of the present invention;

fig. 7 is a schematic diagram of multi-cell cooperation in a specific application scenario according to an embodiment of the present invention;

fig. 8 is a structural diagram of a data transmission device according to an embodiment of the present invention.

Detailed Description

In the embodiment of the invention, aiming at the problem of interference of data REs to CSI-RS pilot symbols in a coordinated multi-point transmission system in the prior art, a coordinated multi-point data transmission method is provided so as to avoid the interference of data REs of adjacent cells to the CSI-RS pilot symbols as much as possible.

Specifically, in the existing coordinated multi-point transmission system, the base station side needs more channel information for signal processing, that is, the base station side needs to add a signaling to notify a user of a channel information measurement set; the channel information measurement set contains cell IDs to be measured, and when a user receives the channel information measurement set, the user needs to perform channel measurement on CSI-RSs of all cells in the measurement set. If the interference of the data of the adjacent cells to the CSI-RS exists, the CSI-RS channel measurement is seriously influenced.

In the embodiment of the invention, when data to be received by a user is sent on the RB scheduled for the user, the base station side avoids REs at the CSI-RS pilot symbol positions of all cells in the channel information measurement set of the user so as to avoid interference of the data REs of adjacent cells on the CSI-RS pilot symbols as much as possible, and then the data sent by the user cannot cause interference on the CSI-RS in the channel information measurement set of the user.

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the description is only a part of the present invention, and not all of it. All other inventions obtained by those skilled in the art without any creative effort based on the present invention belong to the protection scope of the present invention.

As shown in fig. 5, the data transmission method provided in the embodiment of the present invention includes the following steps:

step 501, a network side device determines a channel information measurement set of a User Equipment (UE), and obtains a symbol position corresponding to a pilot reference signal (CSI-RS) of a cell in the channel information measurement set.

Step 502, the network side device punctures data Resource Elements (REs) at symbol positions corresponding to CSI-RSs of other coordinated cells except the serving cell where the UE is located in the channel information measurement set.

The puncturing, by the network side device, the data resource elements REs at symbol positions corresponding to CSI-RSs of other cooperating cells, other than the serving cell where the UE is located in the channel information measurement set includes: the network side equipment punches data REs at symbol positions corresponding to CSI-RSs of all cooperative cells except a serving cell where the UE is located in the channel information measurement set; or, the network side device punctures data REs at symbol positions corresponding to CSI-RSs of a part of cooperating cells other than the serving cell where the UE is located in the channel information measurement set.

Step 503, the network side device acquires, in the resource block RB, the REs used by the data to be received by the UE according to the punctured REs, and sends data to the UE according to the REs used by the data to be received by the UE.

Specifically, the obtaining, by the network side device, REs used by the UE for data to be received in the resource block RB according to the punctured REs includes: and the network side equipment acquires the RE used by the UE for receiving the data from the non-punched RE resource in the RB.

Further, the obtaining, by the network side device, REs used by the UE for receiving data from non-punctured RE resources in the RB specifically includes: and the network side equipment avoids the RE occupied by the PDCCH in the RB and the RE occupied by the pilot frequency symbol, and obtains the RE used by the UE to receive the data from the non-punched RE resource in the RB.

Sending data to the UE according to REs used by the UE to receive data includes: the network side equipment sends CSI-RS to the UE by using the symbol position corresponding to the CSI-RS of the cell where the UE is located, and sends data to the UE by using the RE corresponding to the data to be received of the UE.

It can be seen that the method provided by the embodiment of the present invention has the following advantages:

by perforating data RE (data RE) at the position corresponding to the CSI-RS pilot symbols of the cells in the channel information measurement set, the interference of the data symbols of the adjacent cells in the channel information measurement set on the CSI-RS pilot symbols is effectively reduced or avoided, and the transmission performance of a downlink is improved.

As shown in fig. 6, a detailed description is given to a data transmission method in conjunction with a specific application scenario in the embodiment of the present invention, where the data transmission method is for a coordinated multipoint transmission system in the existing LTE-a in the application scenario. It should be noted that, in the embodiment of the present invention, the device on the Network side includes, but is not limited to, an RNC (Radio Network Controller), an NB (Node B), an enb (evolved Node B), a base station, and the like.

Specifically, the data transmission method includes the following steps:

step 601, the base station informs the UE of an RRM measurement set; alternatively, the UE knows the RRM measurement set in advance.

Specifically, the RRM measurement set aims to provide quality of service guarantee for UEs in the network under the condition of limited bandwidth, so as to flexibly allocate and dynamically adjust the resources available to the radio transmission part and the network, improve the radio spectrum utilization to the maximum extent, prevent network congestion, and keep signaling load as small as possible; therefore, on the premise of ensuring the stability of the cell, more users can be accessed, and the capacity of the whole system is improved.

It can be seen that, by using the RRM measurement set, the UE may obtain a cell capable of providing a service for the UE, and then may acquire a serving base station of the UE (including a serving base station in the RRM measurement set and other cooperative base stations).

Step 602, the UE measures the RSRP value or RSRQ value of the cell included in the RRM measurement set, and reports the measurement result to the base station. Wherein the RSRP value is an absolute value of the serving cell reference signal received power, and the RSRQ value is a relative value between the serving cell reference signal received power and the neighboring cell reference signal received power.

Step 603, the base station determines the serving base station and the channel information measurement set of the UE. After receiving the measurement result reported by the UE, the base station may determine a serving base station of the UE and a channel information measurement set according to the measurement result, where the channel information measurement set may include multiple cells.

Specifically, in the coordinated multi-point transmission system, since a plurality of base stations need to process signals through coordination, the base station needs to determine a channel information measurement set of the UE at this time because the base station needs to process signals by using more channel information.

For example, when signals need to be processed through cooperation among the

base stations

1, 2 and 3, the

base stations

1, 2 and 3 will constitute a channel information measurement set, and the channel information measurement sets of all UEs within the cell 1 (corresponding to the base station 1), the cell 2 (corresponding to the base station 2) and the cell 3 (corresponding to the base station 3) are all the

base stations

1, 2 and 3.

In step 604, the base station notifies the determined serving base station and the channel information measurement set to the corresponding UE. For example, when the UE is located in the cell 1, the serving base station of the UE is the base station 1, and the channel information measurement sets are the

base stations

1, 2, and 3, that is, in this step, the serving base station notified to the UE is the base station 1, and the channel information measurement sets notified to the UE are the

base stations

1, 2, and 3.

Of course, according to actual needs, the serving base station and the channel information measurement set corresponding to the UE may be notified to the UE through the same signaling; in addition, in the embodiment of the present invention, a signaling may also be added to notify the UE of the corresponding channel information measurement set, and the notification mode is arbitrarily selected according to actual needs, which is not described in detail in the embodiment of the present invention.

Step 605, the UE measures the channel state information in the channel information measurement set, and feeds back the channel information of all cells in the channel information measurement set, or feeds back the channel information of a part of cells to the base station.

In this step, after the UE receives the channel information measurement set, it needs to perform channel measurement on CSI-RSs of all cells in the channel information measurement set. For example, when the UE is located in the cell 1 and the base stations in the channel information measurement set are the base station 1, the base station 2, and the base station 3, in this step, the UE needs to measure the channel state information of the cell 1, the cell 2, and the cell 3, and perform channel measurement on the CSI-RS of the cell 1, the cell 2, and the cell 3, which is the same as the existing measurement method and is not repeated in this step.

Specifically, after the measurement is completed, the UE may feed back channel information of all cells of the channel information measurement set to the base station according to its own needs, or the UE may feed back channel information of some cells of the channel information measurement set to the base station. For example, when the UE knows that it can implement its processing only by cooperation of the base station 1 and the base station 2, it may only feed back channel information of the cell 1 and the cell 2 to the base station.

Step 606, the base station performs resource scheduling and allocation according to the channel state information fed back by the UE, that is, the base station selects a cooperative base station providing service for the UE.

Step 607, puncturing the data REs at the positions corresponding to the CSI-RS pilot symbols of the cells in the channel information measurement set, i.e. making the REs at the positions not transmit any information. The main body performing this step may be a device that controls the above cooperative base station, for example, when the base station 1, the base station 2, and the base station 3 need to cooperate and provide service to the above UE, the main body performing this step is a device that controls the base station 1, the base station 2, and the base station 3, for example, in fig. 3, it may be a signal joint processing device; in the embodiment of the present invention, the main body for executing the step is taken as an example of a cooperative base station.

Specifically, the position of the CSI-RS pilot symbol may be selected according to actual needs, and the position of the CSI-RS pilot symbol does not affect the technical solution provided in the embodiments of the present invention. For example, in the above channel information measurement set, the corresponding cells are cell 1, cell 2, and cell 3, respectively, the position of the CSI-RS pilot symbol corresponding to cell 1 is position 1, the position of the CSI-RS pilot symbol corresponding to cell 2 is position 2, and the position of the CSI-RS pilot symbol corresponding to cell 3 is position 3.

In this step, the puncturing RE at the position corresponding to the CSI-RS pilot symbol of the cell in the channel information measurement set specifically includes: and at the RE position corresponding to the CSI-RS pilot symbol of the serving cell, the cooperation cell can not transmit the CSI-RS pilot symbol, and the data RE at the position of the cooperation cell is punched. For example, in an RB transmitted to cell 1, since position 1 needs to transmit the CSI-RS pilot symbol of serving cell 1, and position 2 and position 3 of the cooperating cell cannot transmit the CSI-RS pilot symbol, at this time, the data REs at position 2 and position 3 need to be punctured; similarly, in the RB transmitted to the cell 2, the data REs at the position 1 and the position 3 of the cooperative cell need to be punctured; in the RB transmitted to the cell 3, data REs at position 1 and position 2 of the cooperative cell need to be punctured.

It should be noted that, in this step, according to actual needs, data RE resources at positions corresponding to CSI-RS pilot symbols of all cells in the channel information measurement set may be punctured; or puncturing data RE resources at positions corresponding to CSI-RS pilot symbols of cells in the channel information measurement set. Of course, in practical applications, in order to ensure that the interference influence of data on CSI-RS is minimal, data RE resources at positions corresponding to CSI-RS pilot symbols of all cells need to be punctured.

Step 608, the cooperative base station determines, according to the RE resource after the CSI-RS is punctured, a data RE in the resource block RB used when the UE is scheduled, where the RE is located in the resource block RB and is used to send data to be received by the UE. That is, when transmitting data to be received by the UE, it is necessary to avoid REs punctured by the CSI-RS.

In addition, it should be noted that, when sending data to be received by the UE, it is also necessary to avoid RE resources occupied by the control channel PDCCH and RE resources occupied by the pilot symbols, that is, in the embodiment of the present invention, for the data to be received by the UE, it is necessary to determine the RE resources used by the data to be received by the UE while avoiding the RE resources occupied by the PDCCH, the RE resources occupied by the pilot symbols, and the RE resources punctured by the CSI-RS.

Step 609, the cooperative base station sends downlink data to the UE. In this step, the RE resources determined in the above step (i.e., the RE resources occupied by the PDCCH, the RE resources occupied by the pilot symbols, and the RE resources other than the RE resources punctured by the CSI-RS are avoided) may be used to transmit the downlink data (i.e., the data to be received by the UE).

It can be seen that, in the embodiment of the present invention, downlink data is transmitted by using RE resources other than RE resources that are not punctured by CSI-RS (CSI-RS in the channel information measurement set) so that the downlink data does not interfere with the CSI-RS in the channel information measurement set, and when each UE transmits data according to the data transmission method, interference of data symbols of adjacent cells in the channel information measurement set on CSI-RS pilot symbols can be effectively reduced or avoided, thereby significantly improving the transmission performance of downlink.

In the method provided by the embodiment of the present invention, each step may also be adjusted according to actual needs.

As shown in fig. 7, the data transmission method described above will be further described below with reference to two specific application scenarios.

(1) The channel information measurement sets do not coincide.

The application scenario is static cooperation among a plurality of base stations (a typical scenario is static cooperation among 3 base stations), as shown in fig. 7, a base station 1, a base station 2, and a base station 3 constitute a channel information measurement set, and correspondingly, the channel information measurement sets of all UEs (UE1, UE2, and UE3) in a cell 1, a cell 2, and a cell 3 are all the

base stations

1, 2, and 3.

Similarly, base station 4, base station 5, and base station 6 form another channel information measurement set, and correspondingly, the channel information measurement sets of all UEs (UE4, UE5, and UE6) within cell 4, cell 5, and cell 6 are base station 4, base station 5, and base station 6.

In the embodiment of the present invention, on the scheduled RB, all UEs in cell 1, cell 2 and cell 3 need to avoid the RE resource position corresponding to the PDCCH, the RE resource position corresponding to the pilot symbol, and Data REs other than the CSI-RS1 (CSI-RS of cell 1), the CSI-RS2 (CSI-RS of cell 2), and the CSI-RS3 (CSI-RS of cell 3) corresponding to the RE resource position; for example, when transmitting Data to a UE in cell 1, CSI-RS1 corresponding to serving cell 1 is used to transmit CSI-RS of serving cell 1, while CSI-RS2 of cooperating cell 2 and CSI-RS3 of cooperating cell 3 have punctured corresponding RE positions on RBs of serving cell 1, and on the basis of avoiding the PDCCH corresponding RE resource positions and pilot symbol corresponding RE resource positions, a Data RE used by the UE to receive Data may be selected from the RBs, and then the Data RE is transmitted to the UE in serving cell 1. Similarly, the processing procedures of the UE in the cell 2 and the UE in the cell 3 are similar, and are not described herein again.

All UEs in cell 4, cell 5 and cell 6 need to transmit Data on Data REs except for the RE resource position corresponding to PDCCH, the RE resource position corresponding to pilot symbols, CSI-RS4 (CSI-RS of cell 4), CSI-RS5 (CSI-RS of cell 5), and CSI-RS6 (CSI-RS of cell 6) corresponding to RE resource position on the scheduled RB. The processing procedures of the UE in the cell 4, the UE in the cell 5, and the UE in the cell 6 are similar to the processing procedures of the UE in the cell 1, and are not described herein again.

At this time, the data of the adjacent cells in the channel information measurement set does not interfere with the CSI-RS of the current cell.

(2) The channel information measurement sets are partially overlapping.

The application scenario is dynamic cooperation among base stations, and as shown in fig. 7, it is assumed that a channel information measurement set of the UE3 is composed of base station 1, base station 2, and base station 3, and a channel information measurement set of the UE7 is composed of base station 3, base station 4, and base station 5.

On the scheduled RB, the UE3 needs to transmit Data on Data REs except the position avoiding the position of RE resources corresponding to the PDCCH, the position avoiding the position of RE resources corresponding to pilot symbols, the position avoiding the positions of RE resources corresponding to the pilot symbols, the positions of CSI-RS1, CSI-RS2 and CSI-RS 3;

on the scheduled RB, the UE7 needs to avoid the RE resource location corresponding to the PDCCH, the RE resource location corresponding to the pilot symbol, and the RE resource locations corresponding to CSI-RS3, CSI-RS4, and CSI-RS5, and other Data REs to upload Data.

At this time, although the CSI-RS may be interfered by the data of the neighboring cell on part of the RBs, the data of the neighboring cell within the channel information measurement set causes less interference to the CSI-RS of the current cell.

The embodiment of the present invention further provides a data transmission system, including:

the network side equipment is used for determining a channel information measurement set of the UE and acquiring a symbol position corresponding to a CSI-RS of a cell in the channel information measurement set; puncturing data REs at symbol positions corresponding to CSI-RSs of other cooperative cells except the serving cell where the UE is located in the channel information measurement set; and obtaining the RE used by the UE to receive the data in the RB according to the punched RE, and sending the data to the UE by using the RE used by the UE to receive the data.

As shown in fig. 8, a data transmission device provided in an embodiment of the present invention includes:

the determining module 81 is configured to determine a channel information measurement set of the UE, and obtain a symbol position corresponding to a CSI-RS of a cell in the channel information measurement set.

A processing module 82, configured to puncture data REs at symbol positions corresponding to CSI-RSs of other cooperating cells in the channel information measurement set determined by the determining module 81, except for the serving cell where the UE is located.

The processing module 81 is specifically configured to puncture data resource elements REs at symbol positions corresponding to CSI-RSs of all cooperating cells other than the serving cell where the UE is located in the channel information measurement set; or,

and puncturing the data Resource Elements (REs) at the symbol positions corresponding to the CSI-RSs of the partial cooperative cells except the serving cell where the UE is located in the channel information measurement set.

An obtaining module 83, configured to obtain, in an RB according to the RE punctured by the processing module 82, an RE used by the UE for receiving data.

In this embodiment of the present invention, the obtaining module 83 is specifically configured to obtain REs used by the UE for data to be received from non-punctured RE resources in the RB.

Further, the obtaining module 83 is further configured to avoid REs occupied by a PDCCH and REs occupied by pilot symbols in the RB, and obtain REs used by the UE for receiving data from non-punctured RE resources in the RB.

A transmission module 84, configured to send data to the UE according to the RE used by the data to be received by the UE acquired by the acquisition module 83.

In this embodiment of the present invention, the transmission module 84 is specifically configured to send the CSI-RS to the UE by using a symbol position corresponding to the CSI-RS of a cell in which the UE is located, and send data to the UE by using an RE corresponding to data to be received by the UE.

The modules of the device can be integrated into a whole or can be separately deployed. The modules can be combined into one module, and can also be further split into a plurality of sub-modules.

It can be seen that by using the system and apparatus provided by the present invention, the following advantages are obtained:

Through the above description of the embodiments, it is clear to those skilled in the art that the present invention can be implemented by hardware, or by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.), and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the method of the present invention.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered to be within the scope of the present invention.

Those skilled in the art will appreciate that the modules in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, and may be correspondingly changed in one or more devices different from the embodiments. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.

The above-mentioned serial numbers of the present invention are for description only and do not represent the merits of the embodiments.

The above disclosure is only for a few specific embodiments of the present invention, but the present invention is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.

Claims

1. A method for transmitting data, comprising the steps of:

2. The method of claim 1, wherein the puncturing, by the network side device, the data Resource Elements (REs) at symbol positions corresponding to CSI-RSs of cooperating cells other than the serving cell in which the UE is located in the channel information measurement set comprises:

3. The method of claim 1, wherein the network side device acquiring, in a resource block RB, REs used by the UE for data to be received according to the punctured REs comprises:

4. The method of claim 3, wherein the acquiring, by the network side device, the REs used by the UE for receiving data from the non-punctured RE resources in the RB specifically comprises:

5. The method of any of claims 1-4, wherein sending data to the UE based on REs used by the UE for data to be received comprises:

6. A system for transmitting data, comprising:

7. A device for transmitting data, comprising:

8. The apparatus of claim 7,

the processing module is specifically configured to puncture data REs at symbol positions corresponding to CSI-RSs of all cooperating cells other than the serving cell where the UE is located in the channel information measurement set; or,

9. The apparatus of claim 7,

the obtaining module is specifically configured to obtain REs used by the UE for data reception from non-punctured RE resources in the RB.

10. The apparatus of claim 9,

the obtaining module is further configured to avoid REs occupied by the PDCCH and REs occupied by the pilot symbols in the RB, and obtain REs used by the UE for data to be received from non-punctured RE resources in the RB.

11. The apparatus according to any one of claims 7 to 10,

the transmission module is specifically configured to send the CSI-RS to the UE by using a symbol position corresponding to the CSI-RS of a cell in which the UE is located, and send data to the UE by using an RE corresponding to data to be received by the UE.