WO2014086313A1

WO2014086313A1 - Method and device for transmitting channel state information reference signals

Info

Publication number: WO2014086313A1
Application number: PCT/CN2013/088752
Authority: WO
Inventors: 司倩倩; 林亚男; 沈祖康; 高雪娟; 潘学明
Original assignee: 电信科学技术研究院
Priority date: 2012-12-06
Filing date: 2013-12-06
Publication date: 2014-06-12
Also published as: CN103856310A; CN103856310B

Abstract

Disclosed are a method and device for transmitting channel state information reference signals (CSI-RSs), which relate to the field of wireless communications and are used for reducing the waste of time-frequency resources.In the present invention, the method comprises: a network side sending CSI-RSs in resource elements (REs) in the previous X orthogonal frequency division multiplexing (OFDM) symbols in a downlink subframe or a downlink time slot, wherein X is a positive integer which is less than or equal to 3; and a terminal receiving the CSI-RSs on the REs in the previous X OFDM symbols in the downlink subframe or the downlink time slot. It can be seen that the present method realizes the solution of transmitting the CSI-RSs in the previous X OFDM symbols in the downlink subframe or the downlink time slot. When the solution is applied to a time division duplexing (TDD) guard band and a new carrier type (NCT) carrier, the previous X OFDM symbols in the subframe are fully used, and thus the waste of time-frequency resources is reduced.

Description

Method and device for transmitting channel state information reference signal The application is submitted to the Chinese Patent Office on December 06, 2012. The application number is 201210521729.4, and the invention name is

The priority of the Chinese Patent Application, the disclosure of which is incorporated herein by reference. TECHNICAL FIELD The present invention relates to the field of wireless communications, and in particular, to a method and a device for transmitting a channel state information reference signal. BACKGROUND When there are different time division duplex (TDD) operators in adjacent frequency bands, if different operators configure different TDD uplink and downlink configurations in their respective frequency bands, cross interference between uplink and downlink transmission may be caused. As shown in Figure 1. Interference between uplink and downlink can seriously affect normal communication. To avoid this interference, it is necessary to reserve a guard band between two working bands. Currently no data transmission takes place within the guard band.

In a Long Term Evolution (LTE) system, a radio frame has a length of 10 ms, and a subframe has a length of 1 ms, that is, a radio frame contains 10 subframes. For the time division (TD) system, seven TDD uplink and downlink configurations are currently defined in units of one radio frame, as shown in Table 1, where D represents a downlink subframe, U represents an uplink subframe, and S represents a special sub-frame in the TDD system. The frame and the special subframe include three areas: a Downlink Pilot Time Slot (DwPTS), a Guard Period (GP), and an Uplink Pilot Time Slot (UpPTS), where DwPTS is used. For transmitting the downlink primary synchronization signal and the normal downlink service data, the GP is a guard interval, and is generally defined according to a downlink-to-uplink handover time, an uplink-to-downlink handover time, and a transmission delay associated with the cell radius, to avoid the same The overlapping interference between the uplink and the downlink on the carrier, and the UpPTS is used to transmit the uplink random access signal and the uplink sounding signal.

Table 1 currently defines 10 special subframe configurations for different application scenarios, as shown in Table 2, where T _s is the system sampling time interval, based on 1 subframe corresponding to 30720T _S definition. The subframe structure of different special subframe configurations is shown in Figure 2a - Figure 2b. When the normal cyclic prefix (CP) is used in the downlink, a special subframe contains 14 symbols, as shown in Figure 2a, the downlink subframe. When using an extended CP, a special subframe contains 12 symbols, as shown in Figure 2b.

Table 2 The channel state information reference signal (CSI-RS) transmitted by the network side is used for the measurement of modes 9 and 10. It is a dedicated pilot of the user equipment (User Equipment, UE, also called terminal), that is, the CSI seen by different UEs. The pilots can be different, including the pilot pattern, period, starting position and power. Therefore, one cell may be configured with multiple CSI-RSs, and one UE may also have multiple CSI-RS configurations on one cell. The CSI-RS is transmitted on 1, 2, 4, or 8 antenna ports, corresponding to antenna ports =15 =15,16 =15,...,18 ^^^=15,...,22. In addition, in order to reduce interference between CSI-RS and data between cells, the location of the CSI-RS is usually configured in the neighboring cell, and the region is configured with a zero-power CSI-RS.

The CSI-RS sequence is defined as:

η _Λ (m) = -^= {\ - 2 - c(2m)) + j -^(l -2 - c(2m 1)), m = Q,\,...,N^ ^pL - 1 Where " ^s is the slot number within a radio frame, and ¹ is orthogonal frequency division multiplexing within a slot (Orthogonal Frequency Division Multiplexing, OFDM) The serial number of the symbol. The random sequence ^c ('') is defined in clause 7. of the protocol 36.211. The random sequence is initialized at the beginning of each OFDM:

C _mlt = 2 ¹⁰ · (7 · (« _s + 1)+ / + 1)· (2 · N^ ⁿ + 1)+ 2 · N^ ¹ + No, . for regular CP

Where N<

For extended CP In the transmission subframe of the CSI-RS, the pilot sequence ⁽ called the pilot that will be mapped on the complex symbol as the antenna port p:

-0 &1"/^{15,16}, regular?

-6 for/7 e{l7,18}, 3⁄4CP

-1 forpejl9,20}, regular CP

-7 forpe{21,22}, regular CP

k = V+\2m +

-0 forpEjl5,16}, extended CP

-3 forpejl7,18}, extended CP

—6 forpejl9,20}, extended CP

—9 for {21,22}, extended CP

CSI pilot configuration 0-19, regular CP

CSI pilot configuration 20-31, regular CP

27, extended CP

, - 1

N='. ^L — N'

= m +

2 where (k,, 1,) and can be obtained by the tables 6.10.5.1-1 and 6.10.5.2-2 in the protocol 36.211, the CSI-RS only when the regular CP and the extended CP satisfy the conditions of the above two tables respectively The downlink subframe transmitted in the slot and simultaneously transmitting the CSI-RS shall satisfy the table 6.10.0.5-1 in the protocol 36.211. The terminal assumes that the CSI-RS is not transmitted on the special subframe of the TDD system, or that the CSI-RS and the synchronization signal, the Physical Broadcast Channel (PBCH), and the System Information Format Type 1 message (SystemlnformatKHiBlockTypel messages) are crying. The subframe does not transmit the CSI-RS, or the CSI-RS is not transmitted in the subframe in which the paging information is configured.

For the high-level configuration of the 16-bit zero-power CSI-RS parameter (ZeroPowerCSI-RS), if some of the bits are set to 1, it is assumed that the corresponding 4-port CSI pilot position of the UE is zero power, unless these resource elements and high-level letters The configured non-zero power CSI pilots are overlapped. Wherein, each bit corresponds to a 4-port CSI pilot configuration number, and the first bit on the left corresponds to the lowest number of the 4-port CSI pilot configuration.

In order to reduce system overhead, a new carrier type (New Carrier Type, defined in LTE Rel-11) is defined. NCT), the traditional physical downlink control channel (PDCCH) is not transmitted in the carrier, and the enhanced physical downlink control channel (EPDCCH) can be transmitted. The carrier is demodulated based on UE-specific reference signals (US). The CRS does not transmit or occupies one subframe transmission every 5 ms and transmits only on port 0.

In the prior art, the problem of poor spectrum resources is becoming more and more serious. However, in order to avoid possible interference, no data is currently transmitted in the reserved guard band, so when the bandwidth of the guard band is large, a considerable degree is caused. The waste of spectrum resources, in order to alleviate the current situation of frequent borrowing resources, should improve the utilization of spectrum resources as much as possible. For the above seven TDD uplink and downlink configurations, subframes 0 and 5 are always downlink subframes, subframe 2 is always uplink subframes, and subframe 1 is always a special subframe, so the guard bandwidth reserved between TDD systems In the above-mentioned subframes in which the transmission direction is fixed, data transmission in the same direction can be performed without affecting the existing data transmission. Currently, when the length of the DwPTS is 3 OFDM symbols, it can be used to transmit the PDCCH and the synchronization signal. The PDCCH transmitted at this time is mainly used for uplink scheduling signaling (UL DCI), and is not used for the physical downlink shared channel (PDSCH). If the method is still used in the guard band, the resources in the guard band cannot be fully utilized because there can be only one uplink subframe in the band, and there is no corresponding UL DCI transmission in the subframes 1, 6, and the subframe. 1, 6 can not pass PDSCH, then the first two symbols of subframes 1 and 6 are all wasted. In addition, since the legacy PDCCH is not transmitted on the NCT carrier, when the special subframe is configured to be configured with 0 and 5, the DwPTS in the downlink subframes 1 and 6 has no PDCCH transmission, and does not support PDSCH transmission, which causes waste of resources.

In addition, in LTE Rel-10/11, in some cases, the CSI reference signal may collide with the control channel, the synchronization channel, or the broadcast channel, so the UE will assume that no CSI reference signal is transmitted in a specific subframe. . For example, the protocol clearly states that in the following types of subframes, the UE will assume that no CSI reference signal is transmitted:

- a special subframe in frame structure type 2;

a subframe that may collide with a broadcast channel, a synchronization signal, or a system information block type 1 information;

• Configure a subframe for transmitting paging information.

Therefore, for TDD systems, the number of downlink subframes available for CSI reference signal transmission is much less than that of FDD systems. For example, in a FDD system, all subframes can be used for CSI reference signal transmission. In the TDD system, only a small number of subframes are available, which limits the flexibility of the CSI reference signal in the TDD system.

Further, considering the new scenarios and technologies in Rel-12, for TDD systems, the configuration of CSI reference signals is more limited in the following scenarios:

Scenario 1: TDD uplink and downlink configuration 0

In the scenario where the TDD uplink and downlink configuration can be adaptively switched based on the transmission amount, the TDD uplink and downlink configuration 0 is the most frequently used configuration. For example, for a cell with a lower load, it is more reasonable to choose to use TDD uplink and downlink configuration 0, because the number of downlink subframe transmissions is small, which can save more energy. On the other hand, for TDD uplink and downlink configuration 0, only subframes 0 and 5 can support the transmission of CSI reference signals, and the broadcast channel and the secondary synchronization signal are transmitted in subframe 0 in each radio frame, so it can be used. The CSI reference signal configuration is more limited. In addition, in TDD subframe 5, the SIB1 information is transmitted in a period of 20 milliseconds, and the secondary synchronization signal is in every radio frame. Transmission, while paging information may also be transmitted in subframes 0 and 5 in each radio frame of the TDD, which further limits the available CSI-RS configuration.

- Scene 2: small cell

In Rel-12, the issue of small cell enhancement was introduced. For densely deployed small cell scenarios, the CSI reference signal interference between cells is more serious. In Rel-10/ll, interference between cells can be reduced by configuring a zero-power CSI reference signal. However, since the configuration of the CSI reference signal is limited, it is more difficult to solve the interference problem of the CSI reference signal in this scenario.

- Scenario 3: Multipoint coordinated transmission

In the scenario of coordinated multi-point transmission, the UE may be configured with multiple CSI reference signal processes, each of which has independent non-zero power CSI reference signal configuration, zero-power CSI reference signal configuration, and interference measurement resource configuration. These are all based on the available CSI reference signal configuration, so the CSI reference signal configuration in this scenario is also very limited. SUMMARY OF THE INVENTION The embodiments of the present invention provide a method and a device for transmitting a channel state information reference signal, which are used to reduce waste of time-frequency resources and solve the problem of limited configuration of CSI reference signals.

A CSI-RS transmission method, the method comprising:

The network side determines the configuration information used by the CSI-RS to transmit; the configuration information indicates that the network side transmits the CSI-RS by using a compressed CSI-RS structure; and all CSI-RSs in the compressed CSI-RS structure are in the downlink subframe. Or transmitting in a resource unit (RE) in the first X OFDM symbols in the downlink slot, where X is a positive integer not greater than 3; the network side sends the corresponding CSI-RS to the terminal according to the determined configuration information.

In the method provided by the embodiment of the present invention, the network side sends the CS I-RS in the REs in the first X OFDM symbols in the downlink subframe or the downlink slot, where X is a positive integer not greater than 3, and the method is visible. A scheme of transmitting CS I-RS in the first X OFDM symbols in a downlink subframe or a downlink slot is implemented. This scheme realizes the enhancement of the CS I reference signal and can solve the problem that the CS I reference signal configuration is limited. In addition, when the scheme is applied to the TDD guard band and the carrier of the NCT, the first X OFDM symbols of the subframe can be fully utilized, thereby reducing the waste of time-frequency resources. It should be noted that the technical solution provided by the embodiments of the present invention is applicable not only to the TDD system but also to the FDD system.

Preferably, in the compressed CSI-RS structure, the CSI-RS resource corresponding to each CSI-RS port is composed of Y time-domain neighboring or frequency-domain adjacent REs, where Y is a positive integer greater than one; ,

For the CSI-RS resource corresponding to each CSI-RS port, the CSI-RS resource is multiplexed by the CSI-RS of the Y CSI-RS ports at most.

Based on any of the above embodiments, preferably, the CSI-RS configuration information and the zero-power CSI-RS configuration information included in the configuration information include parameters /' and mod(, 2); The value of / ' and mod( , 2) is 0, where is the number of the slot in which the CSI-RS resource is located, and /' is the number of the first OFDM symbol occupied by the CSI-RS resource in the slot.

Preferably, the number of types corresponding to the CSI-RS configuration included in the configuration information is not less than P, and P is the number of types of CSI-RS configurations corresponding to the compressed CSI-RS structure;

The number of bits occupied by the zero-power CSI-RS configuration information included in the above configuration information is not less than Κ, and K is the number of types of zero-power CSI-RS configurations corresponding to the compressed CSI-RS structure.

Preferably, the number of types corresponding to the CSI-RS configuration included in the configuration information is not less than M, and M is the number of types of CSI-RS configurations defined in the LTE-A system protocol and the corresponding compressed CSI- The sum of the number of types of CSI-RS configurations of the RS structure;

The number of bits occupied by the zero-power CSI-RS configuration information included in the foregoing configuration information is not less than N, where N is the number of types of zero-power CSI-RS configurations defined in the LTE-A system protocol and zero power of the corresponding compressed CSI-RS structure. The sum of the number of types of CSI-RS configurations.

A CSI-RS transmission method, the method comprising:

The terminal determines the configuration information used by the network side to send the CSI-RS; the configuration information indicates that the network side transmits the CSI-RS by using the compressed CSI-RS structure; and all the CSI-RSs in the compressed CSI-RS structure are in the downlink subframe or the downlink Transmitted in REs in the first X OFDM symbols in the slot, where X is a positive integer not greater than 3;

The terminal receives the CSI-RS sent by the network side according to the determined configuration information.

In the method provided by the embodiment of the present invention, the terminal receives the CSI-RS on the RE in the first X OFDM symbols in the downlink subframe or the downlink time slot, where X is a positive integer not greater than 3, and the method is implemented. The scheme of transmitting the CS I-RS in the first X OF匪 symbols in the downlink subframe or the downlink slot. This scheme implements an enhancement of the CSI reference signal and can solve the problem that the CS I reference signal configuration is limited. In addition, when the scheme is applied to the time division duplex TDD guard band and the new type NCT carrier, the first X 0FDM symbols of the subframe can be fully utilized, thereby reducing the waste of time-frequency resources. It should be noted that the technical solution provided by the embodiment of the present invention is applicable not only to the TDD system but also to the FDD system.

Preferably, the CSI-RS configuration information and the zero-power CSI-RS configuration information included in the configuration information include parameters /' and mod(n _s , 2);

The value of / ' and mod( , 2) is 0, where is the number of the slot in which the CSI-RS resource is located, and /' is the number of the first OFDM symbol occupied by the CSI-RS resource in the slot.

Preferably, the configuration information includes a CSI-RS configuration corresponding to the method according to any one of the foregoing terminal side methods. The number of types is not less than P, where P is the number of types of CSI-RS configurations corresponding to the compressed CSI-RS structure; the number of bits occupied by the zero-power CSI-RS configuration information included in the configuration information is not less than Κ, and K is the corresponding compressed CSI- The number of types of zero-power CSI-RS configurations for the RS structure.

Preferably, the number of types corresponding to the CSI-RS configuration included in the configuration information is not less than M, and M is the number of types of CSI-RS configurations defined in the LTE-A system protocol and corresponding to the foregoing method. The sum of the number of types of CSI-RS configurations of the compressed CSI-RS structure;

A base station, the base station comprising:

a determining unit, configured to determine configuration information used by the CSI-RS to transmit; the configuration information indicates that the network side transmits the CSI-RS by using a compressed CSI-RS structure; all CSI-RSs in the compressed CSI-RS structure are in a downlink subframe or Transmitted in resource elements in the first X OFDM symbols in the downlink slot, where X is a positive integer not greater than 3;

And a sending unit, configured to send the corresponding CSI-RS to the terminal according to the determined configuration information.

The base station provided by the embodiment of the present invention sends in the RE in the first X OFDM symbols in the downlink subframe or the downlink slot.

CS I-RS, where X is a positive integer not greater than 3. It can be seen that the base station provided by the embodiment of the present invention implements a scheme of transmitting CSI-RS in the first X OFDM symbols in a downlink subframe or a downlink slot. This scheme realizes the enhancement of the CS I reference signal and can solve the problem that the CSI reference signal configuration is limited. In addition, when the scheme is applied to the time division duplex TDD protection band and the new type NCT carrier, the first X OFDM symbols of the subframe can be fully utilized, thereby reducing the waste of time-frequency resources. It should be noted that the technical solution provided by the embodiment of the present invention is applicable not only to the TDD system but also to the FDD system.

Preferably, in the compressed CSI-RS structure indicated by the configuration information determined by the determining unit, the CSI-RS resources corresponding to each CSI-RS port are composed of Y time-domain neighboring or frequency-domain neighboring REs, where Y is a positive integer greater than 1; and,

Preferably, the CSI-RS configuration information and the zero-power CSI-RS configuration information included in the configuration information determined by the determining unit respectively include parameters Γ and mod(n _s , 2);

Preferably, the number of types corresponding to the CSI-RS configuration included in the configuration information determined by the determining unit is not less than P, and P is the number of types of CSI-RS configurations corresponding to the compressed CSI-RS structure; The number of bits occupied by the zero-power CSI-RS configuration information included in the configuration information determined by the determining unit is not less than K, K is the number of types of zero-power CSI-RS configurations corresponding to the compressed CSI-RS structure.

Preferably, the number of types corresponding to the CSI-RS configuration included in the configuration information determined by the determining unit is not less than M, and M is the number of types of CSI-RS configurations defined in the LTE-A system protocol. The sum of the number of types of CSI-RS configurations corresponding to the compressed CSI-RS structure;

The number of bits occupied by the zero-power CSI-RS configuration information included in the configuration information determined by the determining unit is not less than

N, N is the sum of the number of types of zero-power CSI-RS configurations defined in the LTE-A system protocol and the number of types of zero-power CSI-RS configurations corresponding to the compressed CSI-RS structure.

A base station includes a processor and a radio unit.

The processor is configured to determine configuration information used by the CSI-RS to transmit; the configuration information indicates that the network side transmits the CSI-RS by using a compressed CSI-RS structure; and all CSI-RSs in the compressed CSI-RS structure are in the downlink Transmitted in resource elements within the first X OFDM symbols in a frame or downlink time slot, where X is a positive integer not greater than 3; the radio frequency unit is configured to transmit a corresponding CSI-RS to the terminal according to the determined configuration information.

The base station provided by the embodiment of the present invention sends a CS I-RS in a RE in a first X OFDM symbol in a downlink subframe or a downlink time slot, where X is a positive integer of not more than 3, which is visible in the embodiment of the present invention. The base station implements a scheme of transmitting CSI-RSs in the first X OFDM symbols in a downlink subframe or a downlink slot. This scheme realizes the enhancement of the CS I reference signal and can solve the problem that the CSI reference signal configuration is limited. In addition, when the scheme is applied to the time division duplex TDD protection band and the new type NCT carrier, the first X OFDM symbols of the subframe can be fully utilized, thereby reducing the waste of time-frequency resources. It should be noted that the technical solution provided by the embodiment of the present invention is applicable not only to the TDD system but also to the FDD system.

A terminal, the terminal comprising:

a determining unit, configured to determine configuration information used by the network side to send the CSI-RS; the configuration information indicates that the network side transmits the CSI-RS by using a compressed CSI-RS structure; and all the CSI-RSs in the compressed CSI-RS structure are in the downlink And transmitting in the resource unit in the first X OFDM symbols in the frame or the downlink time slot, where X is a positive integer not greater than 3; and receiving unit, configured to receive the CSI-RS sent by the network side according to the determined configuration information.

The terminal provided by the embodiment of the present invention receives the RE in the first X OFDM symbols in the downlink subframe or the downlink slot.

CS I-RS, where X is a positive integer not greater than 3. It can be seen that the terminal provided by the embodiment of the present invention implements a scheme for transmitting CSI-RS in the first X OFDM symbols in a downlink subframe or a downlink slot. This scheme realizes the enhancement of the CS I reference signal and can solve the problem that the CSI reference signal configuration is limited. In addition, when the scheme is applied to the time division duplex TDD protection band and the new type NCT carrier, the first X OFDM symbols of the subframe can be fully utilized, thereby reducing the waste of time-frequency resources. It should be noted that the technical solution provided by the embodiment of the present invention is applicable not only to the TDD system but also to the FDD system.

Preferably, in any of the foregoing terminal embodiments, in the compressed CSI-RS structure indicated by the configuration information determined by the determining unit, the CSI-RS resources corresponding to each CSI-RS port are adjacent or frequency-transmitted by Y time domains. Domain adjacent RE Composition, where Y is a positive integer greater than one; and,

For a CSI-RS resource corresponding to each CSI-RS port, the CSI-RS resource is multiplexed by at most CSI-RS ports of the CSI-RS port.

Based on any of the foregoing terminal embodiments, preferably, the CSI-RS configuration information and the zero-power CSI-RS configuration information included in the configuration information determined by the determining unit respectively include parameters /' and mod(, 2);

Preferably, the number of types corresponding to the CSI-RS configuration included in the configuration information determined by the determining unit is not less than P, and P is the number of types of CSI-RS configurations corresponding to the compressed CSI-RS structure; The number of bits occupied by the zero-power CSI-RS configuration information included in the configuration information determined by the determining unit is not less than

Κ, K is the number of types of zero-power CSI-RS configurations corresponding to the compressed CSI-RS structure.

N, N is the sum of the number of types of zero-power CS I-RS configurations defined in the LTE-A system protocol and the number of types of zero-power CS I-RS configurations corresponding to the compressed CSI-RS structure.

A terminal comprising a processor and a radio unit.

The processor is configured to determine configuration information used by the network side to send the CSI-RS; the configuration information indicates that the network side transmits the CSI-RS by using a compressed CSI-RS structure; and all CSI-RSs in the compressed CSI-RS structure are in the downlink The resource elements in the first X OFDM symbols in the subframe or downlink time slot are transmitted, where X is a positive integer not greater than 3; the radio frequency unit is configured to receive the CSI-RS transmitted by the network side according to the determined configuration information.

The terminal provided by the embodiment of the present invention receives the CS I-RS on the RE in the first X OFDM symbols in the downlink subframe or the downlink time slot, where X is a positive integer of not more than 3, which is visible in the embodiment of the present invention. The terminal implements a scheme of transmitting CSI-RS in the first X OFDM symbols in the downlink subframe or the downlink slot. The scheme implements an enhancement of the CS I reference signal and can solve the problem that the CSI reference signal configuration is limited. In addition, when the scheme is applied to the time division duplex TDD protection band and the new type NCT carrier, the first X OFDM symbols of the subframe can be fully utilized, thereby reducing the waste of time-frequency resources. It should be noted that the technical solution provided by the embodiment of the present invention is applicable not only to the TDD system but also to the FDD system. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of uplink and downlink interference between TDD systems in the prior art; FIG. 2a is a schematic structural diagram of a special subframe configuration in a downlink conventional CP in the prior art;

2b is a schematic structural diagram of a special subframe configuration in a downlink CP in the prior art;

FIG. 3 is a schematic flowchart of a method according to an embodiment of the present disclosure;

4 is a schematic flowchart of another method according to an embodiment of the present invention;

5a-5u are schematic diagrams showing a CSI-RS transmission pattern in an embodiment of the present invention;

6a-6u are schematic diagrams showing a CSI-RS transmission pattern according to another embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of a terminal according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION In order to provide a CSI-RS transmission method, the waste of time-frequency resources is reduced, and the problem of limited CSI reference signal configuration is solved.

Referring to FIG. 3, the method for transmitting CSI-RS provided by the network side includes the following steps: Step 30: The network side determines configuration information used for sending the CSI-RS; the configuration information indicates that the network side adopts compressed CSI- The RS structure transmits a CSI-RS; all CSI-RSs in the compressed CSI-RS structure are in resource elements (RE) in the first X orthogonal frequency division multiplexing (OFDM) symbols in the downlink subframe or the downlink slot Transmission, where X is a positive integer not greater than 3;

Step 31: The network side sends a corresponding CSI-RS to the terminal according to the determined configuration information.

In the above compressed CSI-RS structure, a CSI-RS resource corresponding to each CSI-RS port is composed of Y time-domain neighboring or frequency-domain adjacent REs, where Y is a positive integer greater than 1; and, for each The CSI-RS resource corresponding to the CSI-RS port, and the CSI-RS resource is multiplexed by the CSI-RS of the Y CSI-RS ports at most.

The above configuration information includes CSI-RS configuration information and zero-power CSI-RS configuration information, including parameters /' and mod(n _s , 2); /, and mod( , 2) have a value of 0, where 3⁄4 is CSI - the number of the slot in which the RS resource is located, /' is the number of the first OFDM symbol occupied by the CSI-RS resource in the slot.

The number of types corresponding to the CSI-RS configuration included in the configuration information is not less than P, where P is the number of types of CSI-RS configurations corresponding to the compressed CSI-RS structure; and the bits occupied by the zero-power CSI-RS configuration information included in the configuration information. The number is not less than Κ, and K is the number of types of zero-power CSI-RS configurations corresponding to the compressed CSI-RS structure; or

The number of types corresponding to the CSI-RS configuration included in the configuration information is not less than M, where M is the number of types of CSI-RS configurations defined in the LTE-A system protocol and the number of types of CSI-RS configurations corresponding to the compressed CSI-RS structure. And the number of bits occupied by the zero-power CSI-RS configuration information included in the foregoing configuration information is not less than N, where N is the number of types of zero-power CSI-RS configurations defined in the LTE-A system protocol and the corresponding compressed CSI-RS structure. The sum of the number of types of zero-power CSI-RS configurations. Referring to FIG. 4, the method for transmitting a CSI-RS provided by a terminal side includes the following steps: Step 40: The terminal determines configuration information used by the network side to send a CSI-RS; the configuration information indicates that the network side adopts compressed CSI. -RS structure transmission CSI-RS; all CSI-RSs in the compressed CSI-RS structure are transmitted in REs in the first X OFDM symbols in the downlink subframe or the downlink slot, where X is a positive integer not greater than 3 ;

Step 41: The terminal receives the CSI-RS sent by the network side according to the determined configuration information.

The above configuration information includes CSI-RS configuration information and zero-power CSI-RS configuration information, including parameters /' and mod(n _s , 2); / ' and mod(n _s , 2) have values of 0, where The number of the slot in which the CSI-RS resource is located, /' is the number of the first OFDM symbol occupied by the CSI-RS resource in the slot.

The number of types corresponding to the CSI-RS configuration included in the configuration information is not less than P, where P is the number of types of CSI-RS configurations corresponding to the compressed CSI-RS structure; the bits occupied by the zero-power CSI-RS configuration information included in the configuration information The number is not less than K, K is the number of types of zero-power CSI-RS configurations corresponding to the compressed CSI-RS structure; or

The number of types corresponding to the CSI-RS configuration included in the configuration information is not less than M, where M is the number of types of CSI-RS configurations defined in the LTE-A system protocol and the number of types of CSI-RS configurations corresponding to the compressed CSI-RS structure. And the number of bits occupied by the zero-power CSI-RS configuration information included in the configuration information is not less than N, where N is the number of types of zero-power CSI-RS configurations defined in the LTE-A system protocol and the corresponding compressed CSI-RS structure. The sum of the number of types of zero-power CSI-RS configurations.

The invention will be specifically described below:

Base station side:

Step 1: The network side determines the port and subframe used to send the CSI-RS. Here, when the number of ports is 1, the port used to send the CSI-RS is port 15, and when the number of ports is 2, the CSI-RS is sent. The ports used are port 15 and port 16. When the number of ports is 4, the ports used to send CSI-RS are port 15, port 16, port 17, and port 18. When the number of ports is 8, the CSI-RS is sent. The ports used are port 15, port 16, port 17, port 18, port 19, port 20, port 21, port 22. The subframe used for transmitting the CSI-RS is a downlink subframe or a special subframe.

Step 2: The network side determines, for each port determined, the resource unit (RE) used to send the CSI-RS to the terminal on the port, and the CSI-RS sent on each RE, and uses the port on each RE. Transmitting a corresponding CSI-RS to the terminal; where the RE used for transmitting the CSI-RS is located in the first two OFDM symbols of the subframe determined in step 30.

Among them, the RE used by CSI-RS reflects the compressed CSI-RS structure.

As an implementation manner, in step 2, the CSI-RS may be sent to the terminal on the port according to the following formula: The RE and the CSI-RS sent on each RE: p)

Where ''is on the port numbered p, the corresponding numbered subcarrier, and the OFDM symbol r _ln (m,)

CSI-RS sent on the RE; " ^s is the slot number, the value is 0; defined for the LTE system protocol

The CSI-RS sequence; the values of k /, m' are determined according to the LTE system protocol, namely:

-6 fo p

-1 fo p

-7 forp

k = k'+\2m +

-0 ΐοτρ

-3 fo p

-6 fo p

-9 fo p

CSI pilot configuration 0-19, regular CP

1 = 1'+ CSI pilot configuration 20-31, regular CP

CSI pilot configuration 0-27, extended CP

Νξ

2 The above parameters (^, determined according to the LTE system protocol, are as follows:

When the number of ports used to send CSI-RS is 1 or 2: (:', /') = (11,0), or ( ', /') = (9,0) , or (k', ) = O,0), or = (10,0), or ( ',/') = (8,0), or = (6,0), or = (5,0), or ( ',/' ) = (4,0), or ( ',/') = (3,0), or ( ',/') = (2,0) , or = (1,0) , or ( ',/' ) = (0,0); or,

When the number of ports used to send CSI-RS is 4: (!:', /') -(11,0) , or W) = (9,0), or ( ',/') = (7, 0), or ( ', /') = (10,0), or ( ',/') = (8,0), or ( ',/') = (6,0); or,

When the number of ports used to send CSI-RS is 8: , /') = (! 1,0) , or ( ',/') = (9,0) , or ( ',/') =(7 , 0).

For details, see Table 3 below:

New CSI-RS CSI-RS port number

Configuration 1 or 2 4 8

n _s mod2 (k',r) n _s mod2 {k',r) n _s mod2

As another implementation manner, in step 2, the RE used for transmitting the CSI-RS to the terminal on the port and the CSI-RS sent on each RE may be determined according to the following formula:

-0-/" for;?e{l5,16,19,20}

k = k'+l2m + <

-6-1" for^-e {17,18,21,22}

0 pe{l5,16,17,18}

l = V+

Pe {19,20,21,22}

p)

Wherein '' is the CSI-RS transmitted on the RE of the numbered subcarrier and the numbered OFDM symbol on the port numbered p; "' is the slot number, and the value is 0; "'', CSI-RS sequence defined for the LTE system protocol; N^ is the downstream bandwidth of the network-side device and the terminal currently working, N ^{x 3⁄4} is the maximum downlink bandwidth of the system; and the parameter W') used for determining, z is satisfied The following conditions: ^ takes values from odd numbers 1 to 11, and 'is 0 or 1.

Specifically, when the number of ports used to send the CSI-RS is 1 or 2: , /') = (11,0), or) = (9,0), or = (7,0), or = ( 11,1), or (!', /') = (9,1), or = (7,1) , or Ο', /') = (5,0), or ( ',/') = (3,0), or ( ) = (1,0), or ( ',/') = (5,1) , or ( ',/') = (3,1) , or ( ',/' ) = (1,1); Or, when the number of ports used to send CSI-RS is 4: (/t', /') = (ll,0), or ( ',/') = (9, 0) , or ( ', /') = (7,0), or (A', /') = (! 1,1), or ( ', /') = (9,1) , or ( ' , /') = (7,1); or,

When the number of ports used to send CSI-RS is 8: ( ', /') = (11,0) , or = (9,0) , or ( ) = (7,0). The details are as shown in Table 4 below:

Preferably, the network side can send the configuration information of the CSI-RS transmission to the terminal according to the method defined in the prior art, that is, the LTE system protocol, and the only difference lies in the CSI-RS configuration information and the zero power included in the configuration information. The CSI-RS configuration information includes parameters /' and mod( , 2) whose value is 0, where is the number of the slot in which the CSI-RS resource is located, and Γ is the first OFDM occupied by the CSI-RS resource in the slot. The number of the symbol.

Preferably, the network side may send at least one of the following six CSI-RS transmission configuration information to the terminal by using high layer signaling:

The number of CSI-RS ports, to inform the number of ports used by the CSI-RS to be sent;

The CSI-RS configuration information is used to notify the number of the CSI-RS configuration to be used, and each CSI-RS configuration corresponds to a value of the parameter used for determining and I (ie, the value); the CSI-RS configuration information. The number of occupied bits is not less than Ν, which is the sum of the number of CSI-RS configurations defined in the LTE system protocol and the number of newly added CSI-RS configurations, where each bit corresponds to a CSI-RS configuration, for example, If a bit is 0, it means that the CSI-RS configuration corresponding to the bit is not used, and if it is 1, it indicates that the CSI-RS configuration corresponding to the bit is adopted;

The CSI-RS subframe configuration information is used to notify the subframe in which the CSI-RS is transmitted; the CSI-RS subframe configuration information may include a CSI-RS transmission period and a subframe offset, and the CSI-RS transmission period is assumed to be T, The frame offset is 2, the terminal may determine that the second subframe in each CSI-RS transmission period T is the subframe in which the CSI-RS is transmitted by the network side; the power per RE on the physical downlink shared channel (PDSCH) The value is a ratio of the power value per RE of the transmitted CSI-RS to inform the transmission power of the CSI-RS; the terminal can determine the power value per RE of the transmitted CSI-RS = ?08 (the power value per RE on 11 / The ratio;

The zero-power CSI-RS configuration information is used to notify the CSI-RS configuration that does not transmit the CSI-RS, that is, the number of the zero-power CSI-RS configuration; the number of bits occupied by the zero-power CSI-RS configuration information is not less than M, and M is LTE. The sum of the number of zero-power CSI-RS configurations defined in the system protocol and the number of newly added zero-power CSI-RS configurations, where each bit pair A zero-power CSI-RS configuration is required. For example, if a certain bit is 0, the CSI-RS corresponding to the bit is configured as a non-zero-power CSI-RS configuration. If 1, the CSI corresponding to the bit is used. - The RS is configured to a zero-power CSI-RS configuration; when the terminal determines that the adopted CSI-RS configuration is a zero-power CSI-RS configuration, the CSI-RS is not received;

Zero-power CSI-RS subframe configuration information to inform the number of subframes that do not transmit CSI-RS; the terminal does not receive CSI-RS on zero-power CSI-RS subframes.

Preferably, the network side may also send at least one of the following six CSI-RS transmission configuration information to the terminal by using high layer signaling:

CSI-RS configuration information, to notify the number of the CSI-RS configuration used, and each CSI-RS configuration corresponds to a value of a determined, used parameter (ie, the value of ( ^k ', ^l '); The number of bits occupied by the CSI-RS configuration information is not less than P, and P is the number of newly added CSI-RS configurations; wherein each bit corresponds to a CSI-RS configuration, for example, if a certain bit is 0, The CSI-RS configuration corresponding to the bit is not used, and if it is 1, it indicates that the CSI-RS configuration corresponding to the bit is adopted;

The CSI-RS subframe configuration information is used to notify the subframe in which the CSI-RS is transmitted; the CSI-RS subframe configuration information may include a CSI-RS transmission period and a subframe offset, and the CSI-RS transmission period is assumed to be T, The frame offset is 2, the terminal may determine that the second subframe in each CSI-RS transmission period T is a subframe in which the CSI-RS is sent by the network side;

The ratio of the power value per RE on the PDSCH to the power value per RE of the transmitted CSI-RS to inform the transmission power of the CSI-RS; the terminal can determine the power value per RE of the transmission CSI-RS = ?08 «1 Power value per RE / the ratio;

Zero-power CSI-RS configuration information to inform the number of CSI-RS configurations that do not send CSI-RS;

The number of bits occupied by the CSI-RS configuration information is not less than K, which is the number of newly added zero-power CSI-RS configurations, where each bit corresponds to a zero-power CSI-RS configuration, for example, if a certain bit is 0. The CSI-RS corresponding to the bit is configured as a non-zero-power CSI-RS configuration. If 1, the CSI-RS corresponding to the bit is configured to be a zero-power CSI-RS configuration; the terminal is determining the CSI used. When the RS is configured for zero-power CSI-RS configuration, CSI-RS reception is not performed;

Zero-power CSI-RS subframe configuration information to inform the number of the subframe in which the CSI-RS is not transmitted; the terminal does not receive the CSI-RS on the zero-power CSI-RS subframe.

Terminal side:

Step 3: The terminal determines a port and a subframe used by the network side to send the CSI-RS.

Step 4: For each port that is determined, determine the network side to use to send the CSI-RS to the terminal on the port.

a RE and a CSI-RS transmitted on each RE, and receiving, by using the port, a CSI-RS sent by the network side on each RE; wherein, the RE used by the network side terminal to send the CSI-RS is located in the sub-determined in step 40. In the first two OFDM symbols of the frame. As an implementation manner, in step 4, the network side may be configured to send the CSI-used REs to the terminal and the CSI-RSs sent by the REs on the port according to the following formula:

Wherein, ^3⁄4 'is the CSI-RS sent by the network side on the port numbered p, corresponding to the numbered subcarrier and the numbered Z OFDM symbol; is the slot number, and the value of ^ is 0; The CSI-RS sequence defined by the LTE system protocol; the values of k, /, ^w r, are determined according to the LTE system protocol, namely:

16}, regular CP

18}, regular CP

20}, regular CP

22}, regular CP

16}, extended CP

18}, extended CP

20}, expansion?

22}, extended CP

19, regular CP

-31, regular CP

7, extended CP

Γ:

:0,1"..,

Ν" The above parameters (^, as determined by the LTE system protocol, are used as follows:

When the number of ports used to send CSI-RS on the network side is 1 or 2: (k', = (11,0), or = (9,0), or ( ',/') = (7,0) , or = (10,0), or = (8,0), or = (6,0), or = (5,0), or = (4,0), or ( ,/') = (3 ,0), or ( ',/') = (2,0) , or = (1,0), or ( ',/') = (0,0); or,

When the number of ports used to send CSI-RS on the network side is 4: ( ', /') = (11,0), or = (9,0), or ( ',/') = (7,0) , or ( ', /') = (10,0), or ( ',/') = (8,0), or ( ',/') = (6,0); or,

When the number of ports used to send CSI-RS on the network side is 8: ( ', /') = (11,0), or = (9,0), or ( ',/') = (7,0) .

See Table 3 above for details. The three types of CSI-RS transmission patterns corresponding to the eight ports in Table 3 are shown in FIG. 5a to FIG. 5c, and the six types of CSI-RS transmission patterns corresponding to the four ports in Table 3 are as shown in FIG. 5d to FIG. 5i, and corresponding to Table 3 The 12 CSI-RS transmission patterns of the 1 or 2 ports are shown in Fig. 5j to Fig. 5u.

In step 4, the following method may also be used to determine the network side to use to send the CSI-RS to the terminal on the port. RE and CSI-RS sent on each RE:

(ρ) f- 0- /" for^e {15,16,19, 20}

k = k'+l2m + <

{-6-Γ' for/7 E {17,18,21,22}

_/ι+ [θ /7 E{15,16,17,18}

" ⁺ l {19, 20, 21, 22}

[ 1 {15,17,19,21}

{16,18,20,22}

= 0,1

= O,I"..,AC ^L _I

: m +

2, where ^β is the CSI-RS transmitted by the network side on the port numbered p on the RE consisting of the numbered subcarrier and the OFDM symbol numbered Z; the slot number is 0; The CSI-RS sequence defined for the LTE system protocol; the downstream bandwidth for the network side device and the terminal currently working, N: ^PL is the maximum downlink bandwidth of the system; the parameter used when determining Z (^', satisfies the following conditions: 'in 1 Take the value from the odd number of 11 and the value of I' is 0 or 1.

Specifically, when the number of ports used by the CSI-RS on the network side is 1 or 2: = (11,0), or ( ',/') = (9,0), or ( ',/') = (7,0) , or ', /') = (11,1) , or (!', /') = (9,1) , or ( ',/') = (7,1) , or ( k V) = (5,0) , or ( ',/') = (3,0) , or ( ) = (1,0) , or = (5,1) , or = (3,1) , Or = (1,1); or,

When the number of ports used to send CSI-RS on the network side is 4: (:', /') = (11,0), or ( ', /') = (9,0), or = (7,0 ), or 0', /') = (! 1,1), or = (9,1), or = (7,1); or,

When the number of ports used by the CSI-RS to transmit on the network side is 8: = (11,0), or ( ',/') = (9,0), or

( ) = (7,0).

Specifically as shown in Table 4 above. The three types of CSI-RS transmission patterns corresponding to the eight ports in Table 4 are shown in FIG. 6a to FIG. 6c, and the six types of CSI-RS transmission patterns corresponding to the four ports in Table 4 are as shown in FIG. 6d to FIG. 6i, and corresponding to Table 4 The 12 CSI-RS transmission patterns of the 1 or 2 ports are shown in Fig. 6j to Fig. 6u.

Preferably, before the step 4, the terminal can receive the configuration information of the CSI-RS transmission sent by the network side in the manner defined in the prior art, that is, the LTE system protocol, and the only difference lies in the CSI-RS configuration information included in the configuration information. And the zero-power CSI-RS configuration information includes parameters /' and mod(n _s , 2) whose value is 0, where is the number of the slot in which the CSI-RS resource is located, and /' is the CSI-RS resource in the slot. The number of the first OFDM symbol occupied.

Preferably, before step 4, the terminal may further receive at least one of the following six types of configuration information that is sent by the network side in advance through high layer signaling: The number of CSI-RS ports is used to determine the number of ports used by the network side to send CSI-RSs, and the terminal determines the ports used by the network side to send CSI-RSs according to the number of CSI-RS ports;

The CSI-RS configuration information is used to determine the number of the CSI-RS configuration used by the network side, and each CSI-RS configuration corresponds to a value (ie, a value) of the parameter determined/used; the CSI- The number of bits occupied by the RS configuration information is not less than Ν, which is the sum of the number of CSI-RS configurations defined in the LTE system protocol and the number of newly added CSI-RS configurations, where each bit corresponds to one CSI-RS configuration. For example, if a certain bit is 0, it means that the CSI-RS configuration corresponding to the bit is not used. If it is 1, it indicates that the CSI-RS configuration corresponding to the bit is adopted; the terminal determines the ^k according to the CSI-RS configuration information. The value of ', ¹ '), and then the value of the M-location determines the RE used by the network side to send the CSI-RS to the terminal on the corresponding port and the CSI-RS sent on each RE;

The CSI-RS subframe configuration information is used to determine a subframe used by the network side to send the CSI-RS; the CSI-RS subframe configuration information may include a CSI-RS transmission period and a subframe offset, and the CSI-RS transmission period is assumed. For T, the subframe offset is 2, the terminal may determine that the second subframe in each CSI-RS transmission period T is a subframe in which the network side transmits the CSI-RS;

The ratio of the power value per RE on the PDSCH to the power value per RE of the transmitted CSI-RS is used to determine the received power of the CSI-RS; the terminal determines the power value per RE of the transmitted CSI-RS = ?08. Power value per RE / the ratio;

The zero-power CSI-RS configuration information is used to determine the number of the CSI-RS configuration in which the network side does not send the CSI-RS; the number of bits occupied by the zero-power CSI-RS configuration information is not less than M, and M is defined in the LTE system protocol. The sum of the number of zero-power CSI-RS configurations and the number of newly added zero-power CSI-RS configurations, where each bit corresponds to a zero-power CSI-RS configuration, for example, if a bit is 0, the bit The corresponding CSI-RS is configured as a non-zero-power CSI-RS configuration. If 1, the CSI-RS configuration corresponding to the bit is configured to be a zero-power CSI-RS configuration; the terminal determines that the adopted CSI-RS configuration is zero. When the power CSI-RS is configured, the CSI-RS is not received;

The zero-power CSI-RS subframe configuration information is used to determine the number of the subframe in which the network side does not transmit the CSI-RS. The terminal does not receive the CSI-RS on the zero-power CSI-RS subframe.

Preferably, the terminal may further receive at least one of the following six configuration information that is sent by the network side in advance through high layer signaling:

The number of CSI-RS ports is used to determine the number of ports used by the network side to send CSI-RSs; the terminal determines the ports used by the network side to send CSI-RSs according to the number of CSI-RS ports;

The CSI-RS configuration information is used to determine the number of the CSI-RS configuration used by the network side, and each CSI-RS configuration corresponds to a value of the parameter used for determining and I (ie, ( ^k ', ^l ' The value of the CSI-RS configuration information is not less than P, and P is the number of newly added CSI-RS configurations; each bit corresponds to a CSI-RS configuration, for example, if a certain bit is 0, it means that the CSI-RS configuration corresponding to the bit is not used. If it is 1, it indicates that the CSI-RS configuration corresponding to the bit is adopted; the terminal determines the value of O according to the CSI-RS configuration information, and further determines according to the The value determines the RE used by the network side to send the CSI-RS to the terminal on the corresponding port, and the CSI-RS sent on each RE;

The ratio of the power value per RE on the PDSCH to the power value per RE of the transmitted CSI-RS is used to determine the received power of the CSI-RS; the terminal determines the power value per RE of the transmitted CSI-RS = ?08 «1 Power value per RE / the ratio;

The zero-power CSI-RS configuration information is used to determine the number of the CSI-RS configuration in which the network side does not send the CSI-RS; the number of bits occupied by the zero-power CSI-RS configuration information is not less than K, and the new zero power is added. The number of CSI-RS configurations, where each bit corresponds to a zero-power CSI-RS configuration. For example, if a certain bit is 0, the CSI-RS corresponding to the bit is configured as a non-zero-power CSI-RS configuration. 1 that indicates that the CSI-RS corresponding to the bit is configured to be a zero-power CSI-RS configuration; when the terminal determines that the adopted CSI-RS configuration is a zero-power CSI-RS configuration, the CSI-RS is not received;

Referring to FIG. 7, an embodiment of the present invention further provides a base station, where the base station includes:

The determining unit 70 is configured to determine configuration information used by the CSI-RS to transmit, where the configuration information indicates that the network side transmits the CSI-RS by using a compressed CSI-RS structure; and all CSI-RSs in the compressed CSI-RS structure are in the downlink subframe. Or transmitting in a resource unit RE in the first X orthogonal frequency division multiplexing OFDM symbols in the downlink time slot, where X is a positive integer not greater than 3;

The sending unit 71 is configured to send, according to the determined configuration information, a corresponding CSI-RS to the terminal.

Further, in the compressed CSI-RS structure indicated by the configuration information determined by the determining unit 70, the CSI-RS resource corresponding to each CSI-RS port is composed of Y time-domain neighboring or frequency-domain adjacent REs, where Y Is a positive integer greater than 1; and,

Further, the CSI-RS configuration information and the zero-power CSI-RS configuration information included in the configuration information determined by the determining unit 70 both include the parameters /' and mod(, 2);

The value of /' and mod( , 2) is 0 , where is the number of the slot in which the CSI-RS resource is located, and /' is the number of the first OFDM symbol occupied by the CSI-RS resource in the slot.

Further, the number of types corresponding to the CSI-RS configuration included in the configuration information determined by the determining unit 70 is not less than P, P is the number of types of CSI-RS configurations corresponding to the compressed CSI-RS structure;

The zero-power CSI-RS configuration information included in the configuration information determined by the determining unit 70 occupies no less than K, and K is the number of types of zero-power CSI-RS configurations corresponding to the compressed CSI-RS structure.

Further, the number of types corresponding to the CSI-RS configuration included in the configuration information determined by the determining unit 70 is not less than M, where M is the number of types of CSI-RS configurations defined in the LTE-A system protocol and the CSI corresponding to the compressed CSI-RS structure. - the sum of the number of types of RS configurations;

The number of bits occupied by the zero-power CSI-RS configuration information included in the configuration information determined by the determining unit 70 is not less than N, where N is the number of types of zero-power CSI-RS configurations defined in the LTE-A system protocol and the corresponding compressed CSI-RS. The sum of the number of types of zero-power CSI-RS configurations of the structure.

Another embodiment of the present invention provides another base station, where the base station includes a processor and a radio frequency unit.

The processor is configured to determine configuration information used by the CSI-RS to transmit; the configuration information indicates that the network side transmits the CSI-RS by using a compressed CSI-RS structure; and all CSI-RSs in the compressed CSI-RS structure are in the downlink subframe Or transmitting in a resource unit in the first X OFDM symbols in the downlink slot, where X is a positive integer not greater than 3;

The radio unit is configured to transmit a corresponding CSI-RS to the terminal according to the determined configuration information.

The base station provided by the embodiment of the present invention sends a CSI-RS in the REs in the first X OFDM symbols in the downlink subframe or the downlink time slot, where X is a positive integer of not more than 3, and it can be seen that the base station provided by the embodiment of the present invention A scheme of transmitting CSI-RSs in the first X OFDM symbols in a downlink subframe or a downlink slot is implemented. This scheme implements an enhancement of the CSI reference signal and can solve the problem of limited configuration of the CSI reference signal. In addition, when the scheme is applied to the time division duplex TDD protection band and the new type of NCT carrier, the first X OFDM symbols of the subframe can be fully utilized, thereby reducing the waste of time-frequency resources. It should be noted that the technical solution provided by the embodiments of the present invention is applicable not only to the TDD system but also to the FDD system.

Referring to FIG. 8, an embodiment of the present invention further provides a terminal, where the terminal includes:

The determining unit 80 is configured to determine configuration information used by the network side to send the CSI-RS, where the configuration information indicates that the network side uses the compressed CSI-RS structure to transmit the CSI-RS; and all the CSI-RSs in the compressed CSI-RS structure are in the downlink. Transmitted in a resource unit RE within the first X orthogonal frequency division multiplexing OFDM symbols in a subframe or a downlink slot, where X is a positive integer not greater than 3;

The receiving unit 81 is configured to receive, according to the determined configuration information, a CSI-RS sent by the network side.

Further, in the compressed CSI-RS structure indicated by the configuration information determined by the determining unit 80, the CSI-RS resource corresponding to each CSI-RS port is composed of Y time-domain neighboring or frequency-domain neighboring REs, where Y Is a positive integer greater than 1; and,

Further, the configuration information determined by the determining unit 80 includes CSI-RS configuration information and zero-power CSI-RS matching. The set information contains the parameters /' and mod(, 2);

Further, the number of types corresponding to the CSI-RS configuration included in the configuration information determined by the determining unit 80 is not less than P, where P is the number of types of CSI-RS configurations corresponding to the compressed CSI-RS structure;

The zero-power CSI-RS configuration information included in the configuration information determined by the determining unit 80 occupies no less than K, and K is the number of types of zero-power CSI-RS configurations corresponding to the compressed CSI-RS structure.

Further, the number of types corresponding to the CSI-RS configuration included in the configuration information determined by the determining unit 80 is not less than M, and M is the number of types of CSI-RS configurations defined in the LTE-A system protocol and the CSI corresponding to the compressed CSI-RS structure. - the sum of the number of types of RS configurations;

The number of bits occupied by the zero-power CSI-RS configuration information included in the configuration information determined by the determining unit 80 is not less than N, where N is the number of types of zero-power CSI-RS configurations defined in the LTE-A system protocol and the corresponding compressed CSI-RS. The sum of the number of types of zero-power CSI-RS configurations of the structure.

Another embodiment of the present invention further provides a terminal, where the terminal includes a processor and a radio frequency unit.

The terminal provided by the embodiment of the present invention receives the CSI-RS on the REs in the first X OFDM symbols in the downlink subframe or the downlink time slot, where X is a positive integer of not more than 3, and the terminal provided by the embodiment of the present invention is visible. A scheme of transmitting CSI-RSs in the first X OFDM symbols in a downlink subframe or a downlink slot is implemented. This scheme implements an enhancement of the CSI reference signal and can solve the problem of limited configuration of the CSI reference signal. In addition, when the scheme is applied to the time division duplex TDD protection band and the new type of NCT carrier, the first X OFDM symbols of the subframe can be fully utilized, thereby reducing the waste of time-frequency resources. It should be noted that the technical solution provided by the embodiments of the present invention is applicable not only to the TDD system but also to the FDD system.

In summary, the beneficial effects of the present invention include:

In the solution provided by the embodiment of the present invention, the network side sends the CSI-RS in the first two OFDM symbols of the subframe, and the terminal receives the CSI-RS on the first two OFDM symbols of the subframe, and the method is implemented. The first two OFDM symbols of the frame transmit the CSI-RS scheme. This scheme implements an enhancement of the CSI reference signal and can solve the problem of limited configuration of the CSI reference signal. In addition, when the scheme is applied to the TDD guard band and the NCT carrier, the first two OFDM symbols of the subframe are fully utilized, thereby reducing the waste of time-frequency resources. It should be noted that the technical solution provided by the embodiment of the present invention is applicable not only to the TDD system but also to the FDD system.

The present invention is directed to a flowchart of a method, apparatus (system), and computer program product according to an embodiment of the present invention. And / or block diagram to describe. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the preferred embodiment of the invention has been described, it will be apparent to those of ordinary skill in the art that <RTIgt; Therefore, the appended claims are intended to be construed as including the preferred embodiments and the modifications

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

Rights request

A method for transmitting a channel state information reference signal CSI-RS, the method comprising: determining, by the network side, configuration information used for transmitting a CSI-RS; the configuration information indicating that the network side adopts a compressed CSI-RS structure Transmitting a CSI-RS; all CSI-RSs in the compressed CSI-RS structure are transmitted in resource elements RE in the first X orthogonal frequency division multiplexing OFDM symbols in a downlink subframe or a downlink slot, where X is a positive integer not greater than 3;

The network side sends a corresponding CSI-RS to the terminal according to the determined configuration information.

2. The method according to claim 1, wherein in the compressed CSI-RS structure, a CSI-RS resource corresponding to each CSI-RS port is composed of Y time-domain neighboring or frequency-domain adjacent REs. Composition, where Y is a positive integer greater than one; and,

The method according to claim 1, wherein the CSI-RS configuration information and the zero-power CSI-RS configuration information included in the configuration information both include a parameter /, and mod(n _s , 2);

The method according to claim 1, wherein the number of types corresponding to the CSI-RS configuration included in the configuration information is not less than P, and P is the number of types of CSI-RS configurations corresponding to the compressed CSI-RS structure;

The number of bits occupied by the zero-power CSI-RS configuration information included in the configuration information is not less than Κ, and K is the number of types of zero-power CSI-RS configurations corresponding to the compressed CSI-RS structure.

The method according to claim 1, wherein the number of types corresponding to the CSI-RS configuration included in the configuration information is not less than M, and M is the number of types of CSI-RS configurations defined in the LTE-A system protocol. The sum of the number of types of CSI-RS configurations corresponding to the compressed CSI-RS structure;

The number of bits occupied by the zero-power CSI-RS configuration information included in the configuration information is not less than N, where N is the number of types of zero-power CSI-RS configurations defined in the LTE-A system protocol and zeros corresponding to the compressed CSI-RS structure. The sum of the number of types of power CSI-RS configurations.

A method for transmitting a channel state information reference signal CSI-RS, the method comprising: determining, by the terminal, configuration information used by a network side to send a CSI-RS; the configuration information indicating that the network side adopts a compressed CSI-RS Structure transmission CSI-RS; all CSI-RSs in the compressed CSI-RS structure are transmitted in resource elements RE in the first X orthogonal frequency division multiplexing OFDM symbols in a downlink subframe or a downlink slot, where X a positive integer not greater than 3; The terminal receives the CSI-RS sent by the network side according to the determined configuration information.

The method according to claim 6, wherein in the compressed CSI-RS structure, a CSI-RS resource corresponding to each CSI-RS port is composed of Y time-domain neighboring or frequency-domain adjacent REs. Composition, where Y is a positive integer greater than one; and,

The method according to claim 6, wherein the configuration information includes CSI-RS configuration information and zero-power CSI-RS configuration information, respectively, including parameters /' and mod(, 2);

The method according to claim 6, wherein the number of types corresponding to the CSI-RS configuration included in the configuration information is not less than P, and P is the number of types of CSI-RS configurations corresponding to the compressed CSI-RS structure;

The method according to claim 6, wherein the number of types corresponding to the CSI-RS configuration included in the configuration information is not less than M, and M is the number of types of CSI-RS configurations defined in the LTE-A system protocol. The sum of the number of types of CSI-RS configurations corresponding to the compressed CSI-RS structure;

A base station, the base station comprising:

a determining unit, configured to determine configuration information used to send the CSI-RS; the configuration information indicates that the network side transmits the CSI-RS by using a compressed CSI-RS structure; and all CSI-RSs in the compressed CSI-RS structure are in the downlink Transmission in a resource unit RE within the first X orthogonal frequency division multiplexing OFDM symbols in a subframe or a downlink slot, where X is a positive integer not greater than 3;

The base station according to claim 11, wherein, in the compressed CSI-RS structure indicated by the configuration information determined by the determining unit, the CSI-RS resources corresponding to each CSI-RS port are represented by Y time domains. Adjacent or adjacent to the frequency domain, wherein Y is a positive integer greater than 1;

The base station according to claim 11, wherein the CSI-RS configuration information and the zero-power CSI-RS configuration information included in the configuration information determined by the determining unit both include a parameter /' and mod(n _s , 2 ); The value of / ' and mod( , 2) is 0, where is the number of the slot in which the CSI-RS resource is located, and /' is the number of the first OFDM symbol occupied by the CSI-RS resource in the slot.

The base station according to claim 11, wherein the number of types corresponding to the CSI-RS configuration included in the configuration information determined by the determining unit is not less than P, and P is a CSI-RS configuration corresponding to the compressed CSI-RS structure. Number of species;

The number of bits occupied by the zero-power CSI-RS configuration information included in the configuration information determined by the determining unit is not less than Κ, where K is the number of types of zero-power CSI-RS configurations corresponding to the compressed CSI-RS structure.

The base station according to claim 11, wherein the number of types corresponding to the CSI-RS configuration included in the configuration information determined by the determining unit is not less than M, and M is a CSI-RS defined in the LTE-A system protocol. The sum of the number of types of configurations and the number of types of CSI-RS configurations corresponding to the compressed CSI-RS structure;

The number of bits occupied by the zero-power CSI-RS configuration information included in the configuration information determined by the determining unit is not less than N, where N is the number of types of zero-power CSI-RS configurations defined in the LTE-A system protocol and the corresponding compressed CSI- The sum of the number of types of zero-power CSI-RS configurations of the RS structure.

16. A terminal, the terminal comprising:

a determining unit, configured to determine configuration information used by the network side to send the CSI-RS; the configuration information indicates that the network side transmits the CSI-RS by using a compressed CSI-RS structure; and all CSI-RSs in the compressed CSI-RS structure are Transmitted in a resource unit RE in a first X orthogonal frequency division multiplexing OFDM symbols in a downlink subframe or a downlink slot, where X is a positive integer not greater than 3;

The receiving unit is configured to receive the CSI-RS sent by the network side according to the determined configuration information.

The terminal according to claim 16, wherein, in the compressed CSI-RS structure indicated by the configuration information determined by the determining unit, the CSI-RS resources corresponding to each CSI-RS port are represented by Y time domains. Adjacent or adjacent to the frequency domain, wherein Y is a positive integer greater than 1;

The terminal according to claim 16, wherein the configuration information determined by the determining unit includes

CSI-RS configuration information and zero-power CSI-RS configuration information include parameters /' and mod(, 2);

The value of / ' and mod(3⁄4, 2) is 0, where is the number of the slot in which the CSI-RS resource is located, and /' is the number of the first OFDM symbol occupied by the CSI-RS resource in the slot.

The terminal according to claim 16, wherein the number of types corresponding to the CSI-RS configuration included in the configuration information determined by the determining unit is not less than P, and P is a CSI-RS configuration corresponding to the compressed CSI-RS structure. Number of species;

The number of bits occupied by the zero-power CSI-RS configuration information included in the configuration information determined by the determining unit is not less than Κ, and K is the number of types of zero-power CSI-RS configurations corresponding to the compressed CSI-RS structure.

The terminal according to claim 16, wherein the number of types corresponding to the CSI-RS configuration included in the configuration information determined by the determining unit is not less than M, and M is a CSI-RS defined in the LTE-A system protocol. The sum of the number of types of configurations and the number of types of CSI-RS configurations corresponding to the compressed CSI-RS structure;