WO2011157071A1

WO2011157071A1 - Method and apparatus for processing channel state information reference signal transmission

Info

Publication number: WO2011157071A1
Application number: PCT/CN2011/071742
Authority: WO
Inventors: 姜静; 张文峰; 张峻峰
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-06-17
Filing date: 2011-03-11
Publication date: 2011-12-22
Also published as: CN102291744A

Abstract

A method and apparatus for processing Channel State Information Reference Signal (CRI-RS) transmission are provided in the present invention, and the method includes: configuring muting processing parameters for CRI-RSs; a cell in a muting set performing muting processing according to the configured parameters, wherein the muting processing is that data of a current cell is not transmitted on a corresponding position where CRI-RSs of another cell in the muting set are transmitted. With the present invention, the quality of channel measurement is improved.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a method and apparatus for transmitting a channel state information reference signal. Background Art In the Long-Term Evolution advance (referred to as Long-Term Evolution advance

LTE-Advance introduces Coordinate Multipoint Transmission and Reception (COMP). In the third generation partner, the 'K 3rd Generation Partnership Project (3GPP) LTE 56 conference, two pilots of the LTE-Advanced system, namely Channel State Information-Reference Signals, have been defined. Referred to as CSI-RS and Demodulation Reference Signals (DMRS), it is clarified that the channel state information reference signal is cell-specific, and the channel state information reference signal is relative to the demodulation guide. The frequency is more sparsely distributed on time-frequency resources.

The channel state information reference signal of the LTE-Advanced system can not only support the mobile terminal to measure the channel on the daily line port of the local cell, but also can measure the CSI-RS of each cell in the measurement set in order to support the COMP technology. In order to make the measurement results more accurate to be as close as possible to the real channel, the CSI-RS resources of each cell should be orthogonally arranged. Meanwhile, in order to improve the measurement quality of the channel measurement, in the prior art, a solution indicates that when a target cell transmits a channel state information reference signal, the time-frequency of the channel state information reference signal is transmitted by the other cells of the measurement set in the target cell. No signal is sent on the resource. This method is called muting processing for short. However, since the interference conditions of each cell are different, the network topology is different. The current muting processing does not reflect these differences, and therefore affects the measurement quality of channel measurement. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a transmission processing scheme of a channel state information reference signal to at least solve the above problems. According to an aspect of the present invention, a method for transmitting a channel state information reference signal is provided, including: configuring a parameter of a muting muting process of a channel state reference signal; and performing, in the muting set, a muting processing according to the configured parameter, The muting process does not transmit data of the local cell in a corresponding location sent by the other cell channel state reference CSI-RS in the muting set. Preferably, the parameter includes at least one of: opening or closing of the muting processing, the muting set, a period of the muting processing, a number of antenna ports processed by the muting, and a location of the muting processing. Preferably, configuring the opening and closing of the muting process includes: when the muting processing is configured to be on, the serving cell does not send data when another cell in the muting set sends a channel state reference signal; When the muting process is configured to be off, the serving cell can transmit data when the other 'j, the zone in the muting set transmits the channel state reference signal. Preferably, configuring the muting set includes: the muting set is adjusted according to an actual interference situation. Preferably, the number of cells included in the muting set is less than or equal to a maximum channel state reference signal inter-cell multiplexing factor. Preferably, configuring the number of the antenna ports of the muting process includes: configuring a predetermined number of antenna ports in the serving cell to perform the muting processing, where the predetermined number is smaller than other ones in the muting set, and j, the area sending channel status reference The number of antenna ports for the signal. Preferably, in the case that the number of antenna ports in which the other cell sends the channel state reference signal in the muting set is 8, the four antenna ports of the serving cell are configured to perform the muting processing, and the other four antenna ports are not implemented. Said muting processing. Preferably, configuring the period of the muting process includes: configuring a longest transmission period of a state reference signal of all cells in the muting set as a period of the muting processing; or: setting a status reference signal of the serving cell The transmission period is configured as the period of the muting processing. Preferably, the location of the muting process is: the target cell sends a channel state information reference signal, and the other cells in the muting set are configured to occupy the resource block RB occupied by the target cell sending the channel state reference signal. Part of the RB sends data. Preferably, the location of the muting process is: the target cell sends a channel state information reference signal, and the other cells in the muting set are configured to occupy a portion of resources occupied by the target cell to transmit a channel state reference signal. RE sends data. Preferably, the location of the muting process is: the target cell sends a channel state information reference signal, and the other cells in the muting set are configured to occupy a portion of resources occupied by the target cell to transmit a channel state reference signal. The subband sends data. According to another aspect of the present invention, a transmission processing apparatus for a channel state information reference signal includes: a configuration module configured to configure a parameter of a silent muting process of a channel state reference signal; and a processing module configured to make a muting set The cell in the cell performs muting processing according to the configured parameter, and the muting process does not transmit data of the local cell in the corresponding location sent by the other cell channel state reference CSI-RS in the muting set. Preferably, the parameter configured by the configuration module includes at least one of: the opening or closing of the muting processing, the muting set, the period of the muting processing, the number of antenna ports processed by the muting, the The location of the muting process. Preferably, the configuration module is configured to adjust the muting set according to an actual interference condition. Preferably, the configuration module is configured to configure a predetermined number of antenna ports in the serving cell to perform the muting process, where the predetermined number is smaller than the number of antenna ports in which the other cells in the muting set transmit channel state reference signals. Preferably, the configuration module is configured to configure a longest transmission period of a state reference signal of all cells in the muting set as a period of the muting processing; or, a transmission period of a status reference signal of the serving cell Configured as the period of the muting process. According to the present invention, the parameters of the muting muting processing of the channel state reference signal are configured; the cells in the muting set perform muting processing according to the configured parameters. The problem that the muting processing in the related art affects the measurement quality of the channel measurement is solved, thereby improving the measurement quality of the channel measurement. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart showing a transmission processing method of a CSI-RS according to an embodiment of the present invention; FIG. 2 is a block diagram showing a configuration of a transmission processing apparatus for a CSI-RS according to an embodiment of the present invention; 3 is a schematic diagram of a muting set configuration according to an embodiment of the present invention; FIG. 4 is a schematic diagram of an RB interval configuration muting according to an embodiment of the present invention; FIG. 5 is a schematic diagram of an RE location configuration muting according to an embodiment of the present invention; 6 is a schematic diagram of a subband configuration muting according to an embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. Embodiment 1 In this embodiment, a CSI-RS transmission processing method is provided. FIG. 1 is a flowchart of a CSI-RS transmission processing method according to an embodiment of the present invention. The flow includes the following steps: Step S102 Configuring a parameter of the muting muting processing of the channel state reference signal; Step S104: The cell in the muting set performs muting processing according to the configured parameter, where the muting processing is a correspondence of channel state reference signal transmissions of other cells in the muting set The location does not send data for this cell. Through the above steps, muting can be configured according to the actual situation. For example, muting can be configured according to the interference situation, the network topology, and the like. Thereby the CoMP measurement accuracy can be improved. For example, the parameters mentioned above may include at least one of the following: opening or closing of muting processing, muting collection, period of muting processing, number of antenna ports for muting processing, and location of muting processing. In this embodiment, a CSI-RS transmission processing apparatus is also provided, and FIG. 2 is a structural block diagram of a CSI-RS transmission processing apparatus according to an embodiment of the present invention. The apparatus includes: a configuration module 22 and a processing module 24 , which is explained below. The configuration module 22 is configured to configure parameters of the muting muting processing of the channel state reference signal; the processing module 24 is coupled to the configuration module 22, configured to enable the cells in the muting set to perform muting processing according to the configured parameters, and the muting processing is in the muting set. The corresponding location transmitted by the other cell channel state reference CSI-RS does not transmit the data of the local cell. Preferably, the parameter configured by the configuration module 22 includes at least one of the following: opening or closing of the muting process, muting set, period of muting processing, number of antenna ports processed by muting, and location of muting processing. For example, the configuration module 22 is configured to adjust the muting set according to the actual interference condition; the configuration module 22 is configured to configure a predetermined number of antenna ports in the serving cell for muting processing, wherein the predetermined number is smaller than other cell transmission channel status reference signals in the muting set The number of antenna ports; the configuration module 22 is configured to configure the longest transmission period of the state reference signals of all cells in the muting set as the period of the muting processing; or, configure the transmission period of the status reference signal of the serving cell as the muting processing cycle. It should be noted that the configurations in all embodiments of the present invention may be completed by the configuration module 22. Embodiment 2 In this embodiment, the opening and closing of the configuration muting processing will be described. When the muting processing is configured to be enabled, the monthly serving cell does not transmit data when the other cells in the muting set transmit the channel state reference signal; if the muting processing is configured to be off, the serving cell can be in the muting set. The cell transmits data when transmitting a channel state reference signal. Embodiment 3 In this embodiment, a configuration muting collection will be described. In a first mode, configuring the muting set includes: collecting statistics on the interference of the cell; configuring a predetermined number of cells with the largest interference as the muting set. In a preferred mode 2, statistics on the interference of the cell are performed; and the predetermined number of cells are configured as a muting set according to the interference of the interference, the cost of the muting processing, and the performance gain of the cooperative transmission technology user equipment. As shown in Figure 3, in the neighboring cell 2, 3, the interference is large, and when the other cells have less interference, the muting set is set to {cell 1 , 2 , 3 } ; in the neighboring cell 2 , 3 , 17 , 18 thousand 4 Large, the other community is 4 when the muting collection is set to {cell 1, 2, 3, 17, 18}. Preferably, the number of cells included in the muting set is less than or equal to the maximum channel state reference signal inter-cell multiplexing factor. Embodiment 4 In this embodiment, the number of antenna ports configured for muting processing will be described. A predetermined number of antenna ports in the monthly cell are configured to perform muting processing, wherein the predetermined number is smaller than the number of antenna ports in which other cells in the muting set transmit channel state reference signals. For example, in the case where the number of antenna ports in which the other cell transmits the channel state reference signal in the muting set is 8, the four antenna ports of the serving cell are configured to perform muting processing. Fifth Embodiment In this embodiment, a cycle in which a muting process is configured will be described. In the first mode, the longest transmission period of the state reference signal of all cells in the muting set is configured as the period of the muting processing. In the second mode, the sending period of the state reference signal of the serving cell is configured as a period of the muting processing. Sixth Embodiment In the present embodiment, a position where the muting processing is configured will be described. In a first mode, the target cell sends a CSI-RS, and the other cells in the muting set are configured to occupy part of the RB transmission data in the resource block RB occupied by the target cell to send the channel state reference signal. Manner 2: The target cell sends a CSI-RS, and the other cells in the muting set are configured to be able to occupy part of the RE transmission data of the resources occupied by the target cell to transmit the channel state reference signal. Manner 3: The target cell sends a CSI-RS, and the other cells in the muting set are configured to occupy part of the subband transmission data of the resource occupied by the target cell to send the channel state reference signal. Through the above embodiments, the throughput loss of the muting processing is minimized, and the necessary CoMP measurement performance is provided by the muting configuration. Embodiment 7 This embodiment combines the technical solutions in the foregoing embodiments. In this embodiment, muting can configure its operating parameters. In this embodiment, a CSI-RS muting configuration method is provided, including:

Muting can be configured for on/off. When muting is configured to be on, the cell does not send data when other cells in the muting set send CSI-RS. When muting is configured to be off, the serving cell is sent in other cells in the muting set. Send data when CSI-RS.

The Muting set is also configurable. FIG. 3 is a schematic diagram of a muting set configuration according to an embodiment of the present invention, as shown in FIG. 3. For the monthly service cell 1, the muting set can be configured as [Cell 1, Cell 2, Cell 3]. When Cell 17 and Cell 18 are also strong interfering cells for Cell 1, the muting set can be configured as [Cell 1 , Cell 2 , cell 3, cell 17, cell 18].

The configuration of the Muting set size is determined according to the long-term statistics of the community, and the N cells are the largest. N can also comprehensively consider muting overhead according to the size of the interference, and configure the CoMP UE performance gain. Preferably, N is less than or equal to a maximum CSI-RS inter-cell multiplexing factor.

The period of the Muting is configurable, and the period of the muting is configured to be the longest period of the CSI-RS transmission of all cells in the muting set, or the period of the muting is configured as the transmission period of the CSI-RS of the serving cell.

Muting's number of antenna ports. Although the CSI-RSs of other cells in the muting set send 8 antenna ports, the serving cell can still configure 4 antenna ports for muting to reduce the cost of muting. 4 is a schematic diagram of an RB interval configuration muting according to an embodiment of the present invention. As shown in FIG. 4, a Muting RB interval may mutuize data at CSI-RS locations of other cells in a muting set on some RBs, and Some RBs do not perform muting. FIG. 5 is a schematic diagram of a RE location configuration muting according to an embodiment of the present invention. As shown in FIG. 5, a Muting RE location may mut data at a CSI-RS location of other cells in a muting set on some REs. Other REs do not perform muting. 6 is a schematic diagram of a subband configuration muting according to an embodiment of the present invention. As shown in FIG. 6, a Muting subband can mut off data at a CSI-RS location of other cells in a muting set on a part of a subband, and Other subbands are not muting. In this embodiment, the processing of the muting is guaranteed to meet the requirements of the cell, and the location of the muting can be flexibly configured, and the parameters such as the period can greatly reduce the cost of the muting and improve the CoMP measurement accuracy. In the following two embodiments, the muting set size, the muting period, and the muting position can be flexibly configured according to the long-term statistics of the interference condition, on the one hand, the muting overhead is reduced, and on the other hand, the CoMP measurement accuracy is improved. The various configuration parameters in the above embodiments can be flexibly selected according to actual conditions, which are described in Embodiment 8 and Embodiment 9. The muting set of the eighth embodiment can be configured, the muting RB position can be configured, and the muting period is configured as the longest sending period of the CSI-RS in the muting set. Embodiment 9 The muting set can be configured, the muting subband can be configured, and the muting period is configured as a CSI-RS sending period of the serving cell in the muting set. If the CSI-RS period of other cells in the muting set is greater than the period, only the cell that sends the CSI-RS in the muting set on the serving cell CSI-RS subframe is considered in the muting process. In summary, with the above embodiments of the present invention, the orthogonal design of the CSI-RSs of different cells is maintained, and the mobile can be improved by not transmitting data on the resource elements of the muting and other channel information reference signals. The terminal estimates the estimated quality of the cooperation 'j, the channel channel state information reference signal, and may pass the resource element bits of the channel state information reference signal of other cells in the muting set. By setting the transmission data and reasonably estimating the interference, the system throughput can be improved by not transmitting data on the resource elements of the channel state information reference signal transmitted by the neighboring cell. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A method for transmitting a channel state information reference signal, comprising:

Configuring parameters of the muting processing of the channel state reference signal;

The cell in the muting set performs muting processing according to the configured parameter, and the muting process does not transmit data of the local cell in the corresponding location sent by the other cell channel state reference CSI-RS in the muting set.

The method according to claim 1, wherein the parameter comprises at least one of: opening or closing of the muting processing, the muting set, a period of the muting processing, and an antenna port of the muting processing. Number, the location of the muting process.

3. The method according to claim 2, wherein configuring the opening and closing of the muting process comprises:

When the muting processing is configured to be on, the serving cell does not send data when other cells in the muting set send channel state reference signals;

When the muting processing is configured to be off, the monthly serving cell can transmit data when other cells in the muting set transmit channel state reference signals.

4. The method according to claim 2, wherein configuring the muting set comprises: the muting set is adjusted according to an actual interference condition.

The method according to claim 1, 2 or 4, wherein the number of cells included in the muting set is less than or equal to a maximum channel state reference signal inter-cell multiplexing factor.

The method of claim 2, wherein configuring the number of antenna ports of the muting process comprises: configuring a predetermined number of antenna ports in a serving cell to perform the muting process, wherein the predetermined number is smaller than the muting set The number of antenna ports in which other cells transmit channel state reference signals.

The method according to claim 6, wherein, in the case that the number of antenna ports of the other cell transmitting the channel state reference signal is 8 in the muting set, configuring four antenna ports of the service 'J, zone In the muting process, the other four antenna ports do not perform the muting process.

The method according to claim 2, wherein configuring the period of the muting processing comprises: configuring a longest transmission period of a state reference signal of all cells in the muting set as a period of the muting processing; or The transmission period of the state reference signal of the service cell is configured as the period of the muting process.

9. The method of claim 2, wherein configuring the location of the muting process comprises: transmitting, by a target cell, a channel state information reference signal, configuring other 'J's in the muting set to be capable of occupying the target The cell transmits part of the RBs in the resource block RB occupied by the channel state reference signal to transmit data.

10. The method of claim 2, wherein configuring the location of the muting process comprises: transmitting, by a target cell, a channel state information reference signal, configuring other 'J's within the muting set to be capable of occupying the target The cell transmits a part of the REs in the resources occupied by the channel state reference signal to transmit data.

11. The method of claim 2, wherein configuring the location of the muting process comprises: transmitting, by a target cell, a channel state information reference signal, configuring other 'J's within the muting set to be capable of occupying the target The cell transmits part of the subbands of the resources occupied by the channel state reference signal to transmit data.

12. A transmission processing apparatus for a channel state information reference signal, comprising:

a configuration module, configured to configure a parameter of a silent muting process of the channel state reference signal;

a processing module, configured to enable a cell in the muting set to perform muting processing according to the configured parameter, where the muting processing is not to send data of the local cell in a corresponding location sent by another cell channel state reference CSI-RS in the muting set .

The device according to claim 12, wherein the parameter configured by the configuration module comprises at least one of: opening or closing of the muting processing, the muting collection, a period of the muting processing, and a The number of antenna ports processed by muting and the position of the muting processing.

14. The apparatus of claim 13, wherein the configuration module is configured to adjust the muting set according to an actual interference condition.

The device according to claim 13, wherein the configuration module is configured to configure a predetermined number of antenna ports in a serving cell to perform the muting process, wherein the predetermined number is smaller than other cell sending channels in the muting set The number of antenna ports for the status reference signal.

The device according to claim 13, wherein the configuration module is configured to configure a longest transmission period of a state reference signal of all cells in the muting set as a period of the muting processing; or The transmission period of the status reference signal of the serving cell is configured as the period of the muting processing.