WO2011156974A1

WO2011156974A1 - Method and apparatus for monitoring downlink channel quality

Info

Publication number: WO2011156974A1
Application number: PCT/CN2010/074090
Authority: WO
Inventors: 张晓博; 郑方正
Original assignee: 上海贝尔股份有限公司; 阿尔卡特朗讯
Priority date: 2010-06-18
Filing date: 2010-06-18
Publication date: 2011-12-22
Also published as: CN102792725A; CN102792725B

Abstract

The present invention provides a method and an apparatus for monitoring downlink channel quality. A first network device has a first plurality of antennas. The method includes: on a first plurality of time-frequency resources in a first radio subframe, the first network device sends a first plurality of Channel Status Information Reference Signals (CSI RSs) via the first plurality of antennas respectively, wherein the first plurality of time-frequency resources share a time period in the first radio subframe. Because the plurality of time-frequency resources for transmitting the CSI RSs share the time period, i.e. the plurality of CSI RSs share the time period, for example an Orthogonal Frequency Division Multiplexing (OFDM) symbol, the power of each OFDM symbol will not change even if a base station changes from sending the CSI RSs via a plurality of antennas to sending the CSI RSs via a single antenna; thus the transmission power at the base station side is maximized; and further the performance of receiving CSI RSs by a user terminal device is improved.

Description

Method and device for downlink channel quality monitoring

The present application relates to wireless communication systems, and more particularly to a method and apparatus for downlink channel quality monitoring in a wireless communication system. Background technique

The LTE-A (Long Term Evolution system-Advanced) considers two downlink reference signals, a DM RS (Demodulation Reference Signal) and a Channel Status Information Reference Signal (CSI RS). The DM RS is used for PDSCH (Physical Downlink Shared Channel) demodulation. The CSI RS is used for downlink channel quality monitoring (CQI/PMI/RI, Channel Quality Indicator/Precoding Matrix Indicator/Rank Indicator, channel quality indicator/precoding matrix indicator/rank indicator), and is a cell-specific pilot.

In the R8 system, each RB (Resource Block) pair, that is, corresponding to 1 subframe and 12 subcarriers, can set multiple reference signals. In the R10 system, only one channel state information reference signal is usually set for every 10 RB pairs, and the average CSI-RS transmitted by each antenna occupies one time-frequency resource particle in one RB pair containing the reference signal (RE, Resource Element ).

In addition, each RB pair has a total of 12 subcarriers multiplied by 14 OFDM (Orthogonal Frequency Division Multiplexing) symbols (ie, 168) of time-frequency resource particles, some of which have been allocated for transmission of some control. information. In R8 and R10, the allocation pattern of time-frequency resource particles is partially the same and partly different. Summary of the invention

If in R10 (ie LTE-A), the base station can transmit signals with multiple antennas, such as two antennas, four antennas and eight antennas. In some cases, such as considering the transmission efficiency or the number of antennas currently in use, the base station may use an antenna instead of Antenna launch. For example, an antenna is used instead of eight antennas. The inventors of the present invention have realized that in this case, if the resources of the CSI-RSs of the plurality of antennas are improperly allocated, the system performance may be adversely affected. If the CSI-RSs of multiple antennas are on different OFDM symbols, when using one antenna for transmission, since the upper power limit on each OFDM symbol is fixed, the transmit power on the OFDM symbol where the antenna is located may be Not enough, the power boosting requirement cannot be met, and the power of the OFDM symbol in which the other antennas that do not transmit the CSI-RS are originally located is reduced, so that the transmission power of the base station side is not fully utilized.

According to the above background art and the existing technical problems, it is very important to be able to reduce or avoid power variation on OFDM symbols when multi-antenna reception becomes single antenna reception.

In order to better address the above considerations, in accordance with an embodiment of the first aspect of the present invention, a method of performing downlink channel quality monitoring in a first network device is provided. The first network device has a first plurality of antennas. The method includes the steps of: transmitting, by the first plurality of antennas, a first plurality of channel state information reference signals, respectively, on the first plurality of time-frequency resources in a first wireless subframe, where the first multiple The time-frequency resources share a time period within the first wireless subframe.

Since the first plurality of time-frequency resources for the CSI-RS share a time period, that is, the first plurality of channel state information reference signals share the time period, for example, one OFDM symbol, even if the base station transmits the CSI-RS from multiple antennas The CSI-RS is transmitted as a single antenna, and the power of each OFDM symbol does not change, thereby maximizing the transmission power of the base station side, thereby improving the performance of the user terminal equipment receiving the CSI-RS. In addition, since the CSI-RS corresponding to one network device is transmitted within one time period instead of being transmitted in two consecutive time periods, the reception of the user terminal device can be compressed, thereby reducing the user terminal device. Power consumption.

According to an embodiment of the second aspect of the present invention, there is provided a method of monitoring a downlink channel quality corresponding to a first network device in a user terminal device. The first network device has a first plurality of antennas. The method includes the following steps:

Receiving a first plurality of channel state information reference signals, the first plurality of channel state signals The information reference signal is sent by the first network device on the first plurality of time-frequency resources in a first wireless subframe, respectively, via the first plurality of antennas, and

- monitoring a downlink channel quality corresponding to the first network device based on the first plurality of channel state information reference signals,

The first plurality of time-frequency resources share a time period in the first wireless subframe. According to an embodiment of the third aspect of the present invention, there is provided a channel quality indicating apparatus for performing downlink channel quality monitoring in a first network device. The first network device has a first plurality of antennas. The channel quality indicator device includes a transmitter, configured to send, by using the first plurality of antennas, a first plurality of channel state information reference signals on a first plurality of time-frequency resources in a first wireless subframe The first plurality of time-frequency resources share a time period in the first wireless subframe. According to an embodiment of the fourth aspect of the present invention, there is provided a channel quality monitoring apparatus for monitoring a downlink channel quality corresponding to a first network device in a user terminal device. The first network device has a first plurality of antennas. The channel quality monitoring device includes:

a receiver for receiving a first plurality of channel state information reference signals, the first plurality of channel state information reference signals being the first plurality of devices in the first wireless subframe by the first network device Time-frequency resources, respectively transmitted via the first plurality of antennas, and

a processor, configured to determine, according to the first plurality of channel state information reference signals, a downlink channel quality corresponding to the first network device,

The first plurality of time-frequency resources share a time period in the first wireless subframe. DRAWINGS

The above and other features, objects, and advantages of the present invention will become more apparent from the detailed description of the accompanying drawings.

Figure la to Figure If is a schematic diagram of a transmission mode of a CSI-RS corresponding to two antenna cases according to an embodiment of the present invention;

2a to 2f are diagrams showing transmission modes of CSI-RSs corresponding to four antenna cases, according to an embodiment of the present invention;

3a to 3f are diagrams showing transmission modes of CSI-RSs corresponding to eight antenna cases, according to an embodiment of the present invention;

4 is a flow chart of a method in accordance with an embodiment of the present invention;

Figure 5 is a schematic diagram of a channel quality monitoring apparatus in accordance with one embodiment of the present invention. The same or similar reference numerals in the drawings represent the same or similar components. detailed description

The invention is further described in detail below with reference to the accompanying drawings.

According to an embodiment of the first aspect of the present invention, there is provided a method of performing downlink channel quality monitoring in a first network device. The first network device has a first plurality of antennas.

Network devices can be implemented in a variety of ways, such as a base station or a relay station. The network device corresponds to one cell, and one cell is identified by a cell ID (Cell ID). The number of antennas of the first plurality of antennas may be any value. Taking the LTE-A system as an example, the number of antennas of the first plurality of antennas may be two, four or eight. The downlink channel refers to the channel used by the network device to transmit signals. Downlink channel quality monitoring may also be referred to as downlink channel quality estimation, downlink channel quality detection, or downlink channel quality measurement.

The method includes the steps of: transmitting, by the first plurality of antennas, a first plurality of channel state information reference signals, respectively, on the first plurality of time-frequency resources in the first wireless subframe, where the first plurality of time-frequency resource sharing A time period within the first wireless subframe.

The wireless subframes may have various lengths, for example, corresponding to the LTE-A system, and one wireless subframe has a length of 1 ms. Each of the first plurality of time-frequency resources can pass In various ways, for example, corresponding to the LTE-A system, each time-frequency resource is one time-frequency resource particle, that is, one time-frequency resource corresponding to one OFDM symbol and one sub-carrier.

The first plurality of channel state information reference signals are the first plurality of CSI-RSs. Each of the first plurality of antennas transmits a CSI-RS signal, and the CSI-RS signals of different antennas may be the same or different. The number of antennas of the first plurality of antennas may be the same as or different from the number of time-frequency resources of the first plurality of time-frequency resources. Corresponding to the LTE-A system, each antenna occupies an average of one time-frequency resource.

The first plurality of time-frequency resources share a time period within the first wireless subframe, that is, the first plurality of channel state information reference signals share the time period. Corresponding to the LTE-A system, the first plurality of time-frequency resources are within one OFDM symbol. The respective CSI-RSs of the first plurality of antennas may be frequency division multiplexed and/or code division multiplexed. Since the first plurality of time-frequency resources used for the CSI-RS share the same time period (eg, within one OFDM symbol), even if the base station transmits the CSI-RS from the multiple antennas to the single-antenna transmission CSI-RS, each OFDM The power of the symbol does not change, thereby maximizing the transmission power of the base station side, thereby improving the performance of the user terminal equipment receiving the CSI-RS. In addition, since the CSI-RS corresponding to one network device is transmitted within one time period instead of being transmitted in two consecutive time periods, the reception of the user terminal device can be simplified, thereby reducing the user terminal device. Power consumption.

A wireless communication system has a plurality of network devices, and the first plurality of antennas of the first network device transmit CSI-RS and other network devices in the wireless communication system (such as network devices of neighboring cells) send CSI- There are many relationships between the ways of RS.

In an embodiment, the second plurality of time-frequency resources in the first wireless subframe are used to send the second plurality of channel state information reference signals, respectively, via the second plurality of antennas of the second network device, the second plurality The time-frequency resource shares a time period within the first wireless subframe with the first plurality of time-frequency resources.

Each of the second plurality of antennas transmits a CSI-RS signal, and the CSI-RS signals of different antennas may be the same or different. The number of antennas of the second plurality of antennas may be the same as or different from the number of time-frequency resources of the second plurality of time-frequency resources. Sharing, by the first plurality of time-frequency resources and the second plurality of time-frequency resources, a time period in the first wireless subframe, that is, the first plurality of channel state information reference signals and the second plurality of channel state information reference signals share a time segment. Corresponding to the LTE-A system, the first plurality of time-frequency resources and the second plurality of time-frequency resources are all within one 0 FDM symbol.

In this way, the CSI-RSs corresponding to multiple network devices in a communication system are concentrated in one OFDM symbol, so that it is easier to find an OFDM symbol that is not used by the downlink reference signal of another communication system for CSI- The RS transmission avoids collision with the downlink reference signals of other communication systems, which facilitates smooth evolution of the communication system, for example, avoids interference to the fifth antenna port in the R8 system.

In still another embodiment, a third plurality of time-frequency resources in a second wireless subframe are used to respectively transmit a third plurality of channel state information reference signals via a third plurality of antennas of a third network device, and third The number of antennas of the plurality of antennas is greater than the number of antennas of the first plurality of antennas, and the frequency resources occupied by the third plurality of time-frequency resources include frequency resources occupied by the first plurality of time-frequency resources, and the third plurality of time-frequency resources and The temporal positional relationship between the second wireless subframes and the temporal positional relationship between the first plurality of time-frequency resources and the first wireless subframe are the same.

Each of the third plurality of antennas transmits a CSI-RS signal, and the CSI-RS signals of different antennas may be the same or different. The number of antennas of the third plurality of antennas may be the same as or different from the number of time-frequency resources of the third plurality of time-frequency resources.

The temporal positional relationship between the time-frequency resource and the wireless subframe (the temporal relationship between the time domain of the instant frequency resource and the wireless subframe) can be represented in various ways. For example, in the LTE-A system, a radio subframe includes 14 OFDM symbols, and the time position relationship between the time-frequency resource and the radio subframe can be represented by the label of the OFDM symbol occupied by the time-frequency resource. When the time position relationship between the time-frequency resource and the wireless subframe is indicated by the labeling manner, the label of the OFDM symbol of the first plurality of time-frequency resources in the first wireless subframe and the third plurality of time-frequency resources are The labels of the OFDM symbols in the second radio subframe are the same.

In a communication system, the average number of time-frequency resources corresponding to each antenna is fixed. When the number of antennas of the third plurality of antennas is greater than the number of antennas of the first plurality of antennas, the time-frequency resources corresponding to the third network device The number is greater than the time corresponding to the first network device The number of frequency resources.

The frequency resource occupied by the third plurality of time-frequency resources includes a frequency resource occupied by the first plurality of time-frequency resources, and a time-position relationship between the third plurality of time-frequency resources and the second wireless subframe and the first The time position relationship between the multiple time-frequency resources and the first wireless subframe is the same. Therefore, for a network device with different antenna numbers, from the perspective of resource allocation mode, when the number of antennas is different, the CSI-RS is occupied. The time-frequency resources have overlapping parts, that is, nested structures. This nested structure facilitates the system to configure the transmission mode of the CSI-RS.

In still another embodiment, a fourth plurality of time-frequency resources in a third wireless subframe are used to respectively transmit a fourth plurality of channel state information reference signals via a fourth plurality of antennas of a fourth network device, and fourth The number of the plurality of antennas is equal to the number of the first plurality of antennas, the temporal positional relationship between the fourth plurality of time-frequency resources and the third wireless subframe, and the first plurality of time-frequency resources and the first wireless subframe The time position relationship is the same, and the frequency resources occupied by the fourth plurality of time-frequency resources are the same as the frequency resources occupied by the first plurality of time-frequency resources.

Each of the fourth plurality of antennas transmits a CSI-RS signal, different antennas

The CSI-RS signals can be the same or different. The number of antennas of the fourth plurality of antennas may be the same as or different from the number of time-frequency resources of the fourth plurality of time-frequency resources.

The fourth plurality of time-frequency resources are the same as the time position relationship between the fourth plurality of time-frequency resources and the third wireless subframe and the time position relationship between the first plurality of time-frequency resources and the first wireless subframe. The occupied frequency resource is the same as the frequency resource occupied by the first plurality of time-frequency resources. From the perspective of the resource allocation mode, the CSI-RS corresponding to the first network device and the fourth network device is time-division multiplexed ( That is, using different wireless subframes) to use the same transmission mode. In this way, when resources for transmitting CSI-RS cannot be allocated for multiple network devices in one wireless subframe, the same CSI-RS transmission mode can be used to transmit CSI-RS signals in different wireless subframes.

The following takes the LTE-A system as an example to specifically describe the transmission modes of multiple CSI-RSs. Figure la to Figure If is a schematic diagram of a transmission mode of a CSI-RS corresponding to two antenna cases, according to an embodiment of the present invention.

Figures la to lc show the case of a normal cyclic prefix (normal cyclic prefix). Transmission resources of CSI-RS allocated for six cells. The base station of each cell has two antennas. The resource particles shaded in Figure la are resource particles that have been occupied by R8 and resource particles that have been allocated in R10. Resource particles that are not shaded are empty resource particles. Figure lb shows some extra resource particles relative to Figure la because of the fact that the antenna port 5 is not used in R8. Figure lc has some extra resource particles relative to Figure la because of the fact that antenna ports 2 and 3 are not used in R8. It can be seen that the resource particles within the OFDM symbol 10 are free, in any case. The two antennas of each cell share two resource particles in the OFDM symbol 10 by means of code division multiplexing, and each antenna occupies one resource particle on average.

Figures Id to If show the transmission resources of CSI-RS allocated for six cells in the case of extended cyclic prefix. The base station of each cell has two antennas. The resource particles shaded in Figure Id are resource particles that have been occupied by R8 and resource particles that have been allocated in R10. Resource particles that are not shaded are idle resource particles. Figure le has some extra resource particles relative to Figure Id because of the fact that antenna port 5 is not used in R8. Figure If there are some more free resource particles relative to the graph le, because the antenna ports 2, 3, and 5 are not used in R8. It can be seen that in any case, the resource particles in OFDM symbol 8 are free. The two antennas of each cell share the two resource particles in the OFDM symbol 8 by means of code division multiplexing, and each antenna occupies one resource particle on average.

2a through 2f are diagrams showing transmission modes of CSI-RSs corresponding to four antenna cases, according to an embodiment of the present invention.

Figures 2a to 2c show the transmission resources of CSI-RS allocated for three cells in the case of a normal cyclic prefix. Figure 2a considers the use of antenna ports 2, 3 and 5 in R8. Figure 2b considers the case where antenna port 5 is not used in R8. Figure 2c considers the case where antenna ports 2 and 3 are not used in R8. The base station of each cell has four antennas. Each of the two antennas of each cell shares the two resource particles in the OFDM symbol 10 by means of code division multiplexing, and each antenna occupies one resource particle on average.

Figure 2d to Figure 2f show the extended cyclic prefix Next, the transmission resources of the CSI-RS allocated for the three cells. Figure 2d considers the use of antenna ports 2, 3 and 5 in R8. Figure 2e considers the case where the antenna port 5 is not used in R8. Figure 2f considers the case where antenna ports 2, 3 and 5 are not used in R8. The base station of each cell has four antennas. The base station of each cell has four antennas. Each of the two antennas of each cell shares two resource particles in the OFDM symbol 8 by means of code division multiplexing, and each antenna occupies one resource particle on average.

3a through 3f are diagrams showing transmission modes of CSI-RSs corresponding to eight antenna cases, according to an embodiment of the present invention.

Figures 3a to 3c show the transmission resources of CSI-RS allocated for one cell in the case of a normal cyclic prefix. Figure 3a considers the use of antenna ports 2, 3 and 5 in R8. Figure 3b considers the case where antenna port 5 is not used in R8. Figure 3c considers the case where antenna ports 2 and 3 are not used in R8. The base station of the cell has eight antennas. Each of the two antennas shares the two resource particles within the OFDM symbol 10 in a code division multiplexing manner, averaging one resource particle per antenna.

Figures 3d to 3f show the transmission resources of CSI-RS allocated for one cell in the case of extended cyclic prefix. Figure 3d considers the use of antenna ports 2, 3 and 5 in R8. Figure 3e considers the case where the antenna port 5 is not used in the R8. Figure 3f considers the case where antenna ports 2, 3, and 5 are not used in R8. The base station of the cell has eight antennas. Each of the two antennas shares the two resource particles in the OFDM symbol 8 by means of code division multiplexing, and each antenna occupies one resource particle on average.

For a case where there are eight antennas in a cell, since one radio subframe can only transmit CSI-RS signals of one cell, the base station of the neighboring cell can use the next radio subframe to transmit CSI-RS signals, that is, time division multiplexing. The way the base stations of different cells use the same CSI-RS transmission mode. Similarly, for a case where a cell has four antennas, since one wireless subframe can only transmit CSI-RS signals of three cells, the base stations of three adjacent cells can use the next wireless subframe to transmit CSI-RS signals. That is, the time base multiplexing is used to make the base stations of different cells use the same CSI-RS transmission mode.

In addition, it can be seen that in the CSI-RS transmission mode shown in FIG. 1a, FIG. 2a, and FIG. 3a, when the number of antennas is different, the allocation pattern of resource particles Some parts are overlapping, the nested structure mentioned above. 4 is a flow chart of a method in accordance with one embodiment of the present invention.

According to an embodiment of the second aspect of the present invention, there is provided a method of monitoring a downlink channel quality corresponding to a first network device in a user terminal device. The user terminal device can be implemented in a variety of ways, such as a mobile phone or a laptop computer. The first network device has a first plurality of antennas.

Referring to FIG. 4, the method includes step 410, the user terminal device receives a first plurality of channel state information reference signals, where the first plurality of channel state information reference signals are used by the first network device in a first wireless subframe. The first plurality of time-frequency resources are respectively sent via the first plurality of antennas.

The method further includes a step 420, the user terminal device monitors, according to the first plurality of channel state information reference signals, a downlink channel quality corresponding to the first network device, where the first plurality of time-frequency resources share the first wireless subframe. A time period.

In an embodiment of the method, the second plurality of time-frequency resources in the first wireless subframe are used to respectively send the second plurality of channel state information reference signals via the second plurality of antennas of the second network device, The plurality of time-frequency resources share a time period in the first wireless subframe with the first plurality of time-frequency resources, that is, a time period shared by the first plurality of time-frequency resources.

In still another embodiment of the method, a third plurality of time-frequency resources in a second wireless subframe are used to respectively transmit a third plurality of channel state information reference signals via a third plurality of antennas of a third network device The number of antennas of the third plurality of antennas is greater than the number of antennas of the first plurality of antennas, and the frequency resources occupied by the third plurality of time-frequency resources include frequency resources occupied by the first plurality of time-frequency resources, and the third plurality of times The temporal positional relationship between the frequency resource and the second wireless subframe and the temporal positional relationship between the first plurality of time-frequency resources and the first wireless subframe are the same.

In still another embodiment of the method, a fourth plurality of time-frequency resources in a third wireless subframe are used to respectively transmit a fourth plurality of channel state information reference signals via a fourth plurality of antennas of a fourth network device The number of the fourth plurality of antennas is equal to the number of the first plurality of antennas, and the time position relationship between the fourth plurality of time-frequency resources and the third wireless subframe is first The time position relationship between the plurality of time-frequency resources and the first wireless subframe is the same, and the frequency resources occupied by the fourth plurality of time-frequency resources are the same as the frequency resources occupied by the first plurality of time-frequency resources. According to an embodiment of the third aspect of the present invention, there is provided a channel quality indicating apparatus for performing downlink channel quality monitoring in a first network device. The first network device has a first plurality of antennas. The channel quality indicator device includes a transmitter, configured to send, by using the first plurality of antennas, a first plurality of channel state information reference signals, respectively, on the first plurality of time-frequency resources in a first wireless subframe, where The first plurality of time-frequency resources share a time period within the first wireless subframe.

In an embodiment of the channel quality indicator, the second plurality of time-frequency resources in the first wireless subframe are used to respectively send the second plurality of channel state information reference signals via the second plurality of antennas of the second network device The second plurality of time-frequency resources share a time period in the first wireless subframe with the first plurality of time-frequency resources, that is, a time period shared by the first plurality of time-frequency resources.

In still another embodiment of the channel quality indicator, a third plurality of time-frequency resources in a second wireless subframe are used to transmit a third plurality of channel state information via a third plurality of antennas of a third network device, respectively. a reference signal, the number of antennas of the third plurality of antennas is greater than the number of antennas of the first plurality of antennas, and the frequency resources occupied by the third plurality of time-frequency resources include frequency resources occupied by the first plurality of time-frequency resources, and the third The temporal positional relationship between the time-frequency resources and the second wireless subframe and the temporal positional relationship between the first plurality of time-frequency resources and the first wireless subframe are the same.

In still another embodiment of the channel quality indicator, the fourth plurality of time-frequency resources in a third wireless subframe are used to transmit the fourth plurality of channel state information via the fourth plurality of antennas of the fourth network device, respectively. a reference signal, the number of the fourth plurality of antennas is equal to the number of the first plurality of antennas, the time position relationship between the fourth plurality of time-frequency resources and the third wireless subframe, and the first plurality of time-frequency resources and the first wireless The time position relationship between the subframes is the same, and the frequency resources occupied by the fourth plurality of time-frequency resources are the same as the frequency resources occupied by the first plurality of time-frequency resources. Figure 5 is a schematic diagram of a channel quality monitoring apparatus in accordance with one embodiment of the present invention. According to an embodiment of the fourth aspect of the present invention, there is provided a channel quality monitoring apparatus for monitoring a downlink channel quality corresponding to a first network device in a user terminal device. The first network device has a first plurality of antennas.

The channel quality monitoring device 500 includes a receiver 510 and a processor 520. The receiver 510 is configured to receive a first plurality of channel state information reference signals, where the first plurality of channel state information reference signals are used by the first network device, on the first plurality of time-frequency resources in a first wireless subframe. , transmitted via the first plurality of antennas, respectively. The processor 520 is configured to determine, according to the first plurality of channel state information reference signals, a downlink channel quality corresponding to the first network device. The first plurality of time-frequency resources share a time period within the first wireless subframe.

In an embodiment of the channel quality monitoring apparatus, the second plurality of time-frequency resources in the first wireless subframe are used to respectively send the second plurality of channel state information reference signals via the second plurality of antennas of one second network device The second plurality of time-frequency resources share a time period in the first wireless subframe with the first plurality of time-frequency resources, that is, a time period shared by the first plurality of time-frequency resources.

In still another embodiment of the channel quality monitoring apparatus, a third plurality of time-frequency resources in a second wireless subframe are used to respectively transmit a third plurality of channel state information via a third plurality of antennas of a third network device a reference signal, the number of antennas of the third plurality of antennas is greater than the number of antennas of the first plurality of antennas, and the frequency resources occupied by the third plurality of time-frequency resources include frequency resources occupied by the first plurality of time-frequency resources, and the third The temporal positional relationship between the time-frequency resources and the second wireless subframe and the temporal positional relationship between the first plurality of time-frequency resources and the first wireless subframe are the same.

In still another embodiment of the channel quality monitoring apparatus, a fourth plurality of time-frequency resources in a third wireless subframe are used to respectively transmit a fourth plurality of channel state information via a fourth plurality of antennas of a fourth network device a reference signal, the number of the fourth plurality of antennas is equal to the number of the first plurality of antennas, the time position relationship between the fourth plurality of time-frequency resources and the third wireless subframe, and the first plurality of time-frequency resources and the first wireless The temporal positional relationship between sub-frames is the same, The frequency resources occupied by the fourth plurality of time-frequency resources are the same as the frequency resources occupied by the first plurality of time-frequency resources. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the present embodiments are to be considered as illustrative and not restrictive. In addition, it is obvious that the term "comprising" does not exclude other elements or steps, and the word "a" or "an" The various elements recited in the claims of the product can also be implemented by one element in software or hardware. The first, second, etc. words are used to denote names, and do not denote any particular order.

Claims

Claim

A method for performing downlink channel quality monitoring in a first network device, the first network device having a first plurality of antennas, the method comprising the steps of:

Transmitting, by the first plurality of antennas, a first plurality of channel state information reference signals on a first plurality of time-frequency resources within a first wireless subframe,

The first plurality of time-frequency resources share a time period in the first wireless subframe.

2. The method according to claim 1, wherein the second plurality of time-frequency resources in the first radio subframe are used to respectively send a second plurality of channels via a second plurality of antennas of one second network device a status information reference signal, the second plurality of time-frequency resources sharing the time period in the first wireless subframe with the first plurality of time-frequency resources.

3. The method according to claim 1, wherein a third plurality of time-frequency resources in a second wireless subframe are used to respectively transmit a third plurality of channel states via a third plurality of antennas of a third network device The information reference signal, the number of antennas of the third plurality of antennas is greater than the number of antennas of the first plurality of antennas, and the frequency resources occupied by the third plurality of time-frequency resources include the first plurality of time-frequency resources The occupied frequency resource, the temporal positional relationship between the third plurality of time-frequency resources and the second wireless subframe, and between the first plurality of time-frequency resources and the first wireless subframe The time position relationship is the same.

4. The method according to claim 1, wherein a fourth plurality of time-frequency resources in a third wireless subframe are used to respectively transmit a fourth plurality of channel states via a fourth plurality of antennas of a fourth network device An information reference signal, the number of antennas of the fourth plurality of antennas is equal to the number of antennas of the first plurality of antennas, and the time position relationship between the fourth plurality of time-frequency resources and the third wireless subframes The time position relationship between the first plurality of time-frequency resources and the first wireless subframe is the same, the frequency resources occupied by the fourth plurality of time-frequency resources and the first plurality of time-frequency resources The frequency resources occupied are the same.

5. A method of monitoring a downlink channel quality corresponding to a first network device in a user equipment, the first network device having a first plurality of antennas, the method comprising the steps of:

Receiving a first plurality of channel state information reference signals, the first plurality of channel state information reference signals being, by the first network device, on a first plurality of time-frequency resources in a first wireless subframe, respectively Transmitted via the first plurality of antennas, and

The method according to claim 5, wherein the second plurality of time-frequency resources in the first wireless subframe are used to respectively send a second multiple channel via a second plurality of antennas of one second network device a status information reference signal, the second plurality of time-frequency resources sharing the time period in the first wireless subframe with the first plurality of time-frequency resources.

7. The method according to claim 5, wherein a third plurality of time-frequency resources in a second wireless subframe are used to respectively transmit a third plurality of channel states via a third plurality of antennas of a third network device The information reference signal, the number of antennas of the third plurality of antennas is greater than the number of antennas of the first plurality of antennas, and the frequency resources occupied by the third plurality of time-frequency resources include the first plurality of time-frequency resources The occupied frequency resource, the temporal positional relationship between the third plurality of time-frequency resources and the second wireless subframe, and between the first plurality of time-frequency resources and the first wireless subframe The time position relationship is the same.

8. The method according to claim 5, wherein a fourth plurality of time-frequency resources in a third wireless subframe are used to respectively transmit a fourth plurality of channel states via a fourth plurality of antennas of a fourth network device Information reference signal, the number of antennas of the fourth plurality of antennas is equal to the number of antennas of the first plurality of antennas, and the fourth plurality of time-frequency resources and the The time position relationship between the three radio subframes and the time position relationship between the first plurality of time-frequency resources and the first radio subframe, and the frequency resources occupied by the fourth plurality of time-frequency resources The frequency resource occupied by the first plurality of time-frequency resources is the same.

A channel quality indicating device for performing downlink channel quality monitoring in a first network device, the first network device having a first plurality of antennas, the channel quality indicating device comprising:

a transmitter, configured to send, by using the first plurality of antennas, a first plurality of channel state information reference signals on a first plurality of time-frequency resources in a first wireless subframe,

The channel quality indicator device according to claim 9, wherein the second plurality of time-frequency resources in the first wireless subframe are used to respectively send a second through a second plurality of antennas of a second network device a plurality of channel state information reference signals, the second plurality of time-frequency resources sharing the time period in the first wireless subframe with the first plurality of time-frequency resources.

The channel quality indicator device according to claim 9, wherein a third plurality of time-frequency resources in a second radio subframe are used to respectively transmit a third antenna via a third plurality of antennas of a third network device a plurality of channel state information reference signals, where the number of antennas of the third plurality of antennas is greater than the number of antennas of the first plurality of antennas, and the frequency resources occupied by the third plurality of time-frequency resources include the first plurality of a frequency resource occupied by the time-frequency resources, a temporal positional relationship between the third plurality of time-frequency resources and the second wireless subframe, and the first plurality of time-frequency resources and the first wireless sub- The temporal positional relationship between frames is the same.

The channel quality indicating device according to claim 9, wherein: a third The fourth plurality of time-frequency resources in the wireless subframe are used to respectively transmit a fourth plurality of channel state information reference signals via a fourth plurality of antennas of a fourth network device, where the number of antennas of the fourth plurality of antennas is equal to a number of antennas of the first plurality of antennas, a temporal positional relationship between the fourth plurality of time-frequency resources and the third wireless subframe, and the first plurality of time-frequency resources and the first wireless sub- The time position relationship between the frames is the same, and the frequency resources occupied by the fourth plurality of time-frequency resources are the same as the frequency resources occupied by the first plurality of time-frequency resources.

A channel quality monitoring apparatus for monitoring a downlink channel quality corresponding to a first network device in a user equipment, the first network device having a first plurality of antennas, the channel quality monitoring apparatus comprising:

The channel quality monitoring apparatus according to claim 13, wherein the second plurality of time-frequency resources in the first wireless subframe are used to respectively send a second through a second plurality of antennas of one second network device. a plurality of channel state information reference signals, the second plurality of time-frequency resources sharing the time period in the first wireless subframe with the first plurality of time-frequency resources.

The channel quality monitoring apparatus according to claim 13, wherein a third plurality of time-frequency resources in a second wireless subframe are used to respectively transmit a third multiple via a third plurality of antennas of a third network device Channel state information reference signal, the third plurality of days The number of antennas of the line is greater than the number of antennas of the first plurality of antennas, and the frequency resources occupied by the third plurality of time-frequency resources include frequency resources occupied by the first plurality of time-frequency resources, and the third a time position relationship between the plurality of time-frequency resources and the second wireless subframe and a time position relationship between the first plurality of time-frequency resources and the first wireless subframe.

The channel quality monitoring apparatus according to claim 13, wherein a fourth plurality of time-frequency resources in a third wireless subframe are used to respectively transmit a fourth multiple via a fourth plurality of antennas of a fourth network device Channel number information reference signals, the number of antennas of the fourth plurality of antennas is equal to the number of antennas of the first plurality of antennas, and the time between the fourth plurality of time-frequency resources and the third wireless subframes a positional relationship and a time position relationship between the first plurality of time-frequency resources and the first wireless subframe, and a frequency resource occupied by the fourth plurality of time-frequency resources and the first plurality of times The frequency resources occupied by the frequency resources are the same.