CN101541029A - Sending method and device of measure-reference signal under state of carrier aggregation - Google Patents

Abstract

The invention discloses a sending method and a sending device of a measure-reference signal under state of carrier aggregation, being applied to an advanced long-term evolution system. The sending method comprises the steps: a base station configures a group or a plurality of groups of measure-reference signal configuration parameters for an uplink component carrier to be measured of user equipment (UE) under carrier aggregation and sends the parameters to the UE; and according to the received measure-reference signal configuration parameters, the UE sends the measure-reference signal to the base station. The invention can maintain the compatibility with the UE of the long-term evolution system and can optimize the property for sending measure signals of the UE of the advanced long-term evolution system when the carrier aggregation technology is adopted.

Description

Method and device for sending measurement reference signal in case of carrier aggregation

technical field

The present invention relates to the field of communications, in particular to a method and device for sending uplink measurement reference signals in the case of carrier aggregation.

Background technique

Measurement Reference Signal (Sounding Reference Signal, SRS) is a signal used to measure wireless channel information (channel state information, CSI) between a terminal device and a base station. In the Long Term Evolution (LTE) system, the user equipment (User Equipment, UE) regularly sends the Uplink SRS. The eNB judges the uplink CSI of the UE according to the received SRS signal, and performs operations such as frequency domain selective scheduling and closed-loop power control according to the obtained CSI.

In the LTE system, the SRS signal sent by the UE is obtained by performing a cyclic shift α on a root sequence r _u,v (n). Different SRS sequences can be obtained by performing different cyclic shifts α on the same root sequence, and these obtained SRS sequences are mutually orthogonal, so these SRS sequences can be allocated to different UEs for use. In LTE, the SRS sequence defines 8 cyclic shifts, namely: 0, 1, 2, 3, 4, 5, 6, 7, indicated by 3-bit signaling. That is to say, under the same time-frequency resource, UEs in the cell have 8 available code resources, and the eNB can configure up to 8 UEs to send SRS at the same time.

In the LTE system, the frequency domain bandwidth of the SRS signal is configured using a tree structure. Each SRS bandwidth configuration (that is, SRS bandwidth configuration) corresponds to a tree structure, and the highest-level SRS bandwidth (SRS-Bandwidth) corresponds to the maximum bandwidth (or SRS bandwidth range) of this SRS bandwidth configuration. Table 1 to Table 4 show the SRS bandwidth configuration in different uplink bandwidth ranges. Taking the SRS bandwidth configuration 1 in the table as an example, b=0 is layer 0, which is the highest layer of the tree structure, and the SRS bandwidth corresponding to this layer is the bandwidth corresponding to 32 resource blocks (Resource Block, RB), which is The maximum SRS bandwidth configured by this SRS bandwidth; b=1 is layer 1, the SRS bandwidth of this layer is the bandwidth corresponding to 16 RBs, and one SRS bandwidth of the upper layer is split into two SRS bandwidths of layer 1; b =2 is layer 2, the SRS bandwidth of this layer is the bandwidth corresponding to 8 RBs, and one SRS bandwidth of the upper layer is split into two SRS bandwidths of layer 2; b=3 is layer 3, the SRS bandwidth of this layer The bandwidth is the bandwidth corresponding to 4 RBs, and one SRS bandwidth of the upper layer is split into two SRS bandwidths of the third layer, and its structure is shown in FIG. 1 .

In addition, the subcarriers of the SRS signal are placed at intervals within the same SRS frequency band, that is, the transmission of the SRS adopts a comb structure, and the number of frequency combs (frequency comb) is 2. As shown in Figure 2, when each UE sends an SRS, it only uses one of the two frequency combs (comb=0 or comb=1), corresponding to the fact that the UE only uses subcarriers with even or odd frequency domain indexes (sub- carrier) to send SRS. This comb structure allows more users to send SRS signals within the same SRS bandwidth.

In the LTE system, the base station first allocates an SRS bandwidth allocation index C _SRS to all UEs in the cell, and can determine which one of Table 1 to Table 4 to use according to the number of RBs (N _RB ^UL ) corresponding to the current uplink system bandwidth table, and then according to the C _SRS , the SRS bandwidth configuration used by the current cell can be determined. For a certain UE, the base station also allocates an SRS bandwidth index B _SRS (or called the index of the layer it belongs to) to it. According to the SRS bandwidth configuration in the cell and the bandwidth index B _SRS , the UE can obtain the SRS bandwidth it uses. For example, the current cell SRS bandwidth configuration index C _SRS =1, $N_{\mathrm{RB}}^{\mathrm{UL}}=50,$ Then the SRS bandwidth of the current cell is configured as the second row in Table 2. If the bandwidth index allocated by the current cell to a certain UE is 1, the SRS bandwidth of this UE occupies 16 RBs, and the position of the SRS bandwidth of this UE is within the range of the SRS bandwidth (that is, the range of the maximum SRS bandwidth is 48 RB).

After the UE obtains its own SRS bandwidth, it will determine its initial position for sending SRS according to the upper layer signaling n _RRC sent by the eNB. As shown in FIG. 3 , UEs allocated with different n _RRC signaling will send SRS in different areas of the SRS bandwidth of the cell.

When the frequency hopping of the UE is configured, the UE will send SRS in different frequency bands within the system SRS bandwidth over time. During frequency hopping, the base station will notify the UE of the frequency hopping bandwidth by signaling b _hop . The UE frequency hopping mode is to send SRS in different areas within the frequency hopping bandwidth according to different branches of the SRS bandwidth tree structure. Taking the system SRS bandwidth configuration shown in FIG. 1 as an example, assuming that the UE-specific bandwidth configuration index B _SRS =3, the bandwidth for sending the SRS by the UE is 4 RBs. It is further assumed that the starting position of sending the SRS by the UE is the frequency domain position where n _RRC =0. Then, as shown in FIG. 4 , the base station may configure different b _hops to instruct the UE to have different frequency hopping bandwidths.

Table 1 $(6\≤N_{\mathrm{RB}}^{\mathrm{UL}}\≤40)$

Table 2 $(40{<N}_{\mathrm{RB}}^{\mathrm{UL}}\&le;60)$

table 3 $(60<N_{\mathrm{RB}}^{\mathrm{UL}}\&le;80)$

Table 4 $(80<N_{\mathrm{RB}}^{\mathrm{UL}}\&le;110)$

In LTE, from the perspective of the time domain, the UE only sends the SRS on the last single carrier frequency division multiple access (Single Carrier Frequency Division Multiple Access, SC-FDMA) symbol of the subframe. The configuration of UE sending SRS in the time domain is related to four parameters: cell-specific (cell-specific) period (T _SFC ) and subframe offset (Δ _SFC ), and UE-specific (UE-specific) period (T _SRS ) and a subframe offset (T _offset ). Tables 5 and 6 respectively give the cell-specific period and subframe offset in Frequency Division Duplex (FDD) and Time Division Duplex (Time Division Duplex, TDD) systems. The cell-specific period and subframe offset give the time-domain subframe position where all UEs in the cell may transmit SRS, while on other subframes, the use of the last SC-FDMA symbol is not related to the transmission of SRS. Taking srsSubframeConfiguration=7 in Table 5 as an example, T _SFC =5, Δ _SFC ={0, 1}, as shown in Figure 5, S in the figure represents that the base station is configured with SRS resources in this subframe, and a cell-specific one in the cell The SRS transmission period is 5 subframes, and the positions of subframe 0 and subframe 1 in each period can be used by the UE to transmit SRS.

Table 5: FDD sounding reference signal subframe configuration

(FDD SRS subframe configuration)

srsSubframeConfigurationSRS subframe configuration Binary binary Configuration PeriodT _SFC (subframes) period (number of subframes) TransmissionoffsetΔ _SFC (subframes) subframe offset 0 0000 1 {0} 1 0001 2 {0} 2 0010 2 {1} 3 0011 5 {0} 4 0100 5 {1} 5 0101 5 {2} 6 0110 5 {3} 7 0111 5 {0, 1} 8 1000 5 {2, 3}

9 1001 10 {0} 10 1010 10 {1} 11 1011 10 {2} 12 1100 10 {3} 13 1101 10 {0, 1, 2, 3, 4, 6, 8} 14 1110 10 {0, 1, 2, 3, 4, 5, 6, 8} 15 1111 reserved reserved

Table 6: TDD sounding reference signal subframe configuration

(TDD SRS subframe configuration)

SrsSubframeConfigurationSRS subframe configuration Binary binary ConfigurationPeriod T _SFC (subframes) period (number of subframes) TransmissionoffsetΔ _SFC (subframes) subframe offset 0 0000 5 {1} 1 0001 5 {1, 2} 2 0010 5 {1, 3} 3 0011 5 {1, 4} 4 0100 5 {1, 2, 3} 5 0101 5 {1, 2, 4} 6 0110 5 {1, 3, 4} 7 0111 5 {1, 2, 3, 4} 8 1000 10 {1, 2, 6} 9 1001 10 {1, 3, 6} 10 1010 10 {1, 6, 7} 11 1011 10 {1, 2, 6, 8}

12 1100 10 {1, 3, 6, 9} 13 1101 10 {1, 4, 6, 7} 14 1110 reserved reserved 15 1111 reserved reserved

Tables 7 and 8 respectively show the UE-specific SRS transmission period and subframe offset in FDD and TDD systems. The UE-specific period and subframe offset give the time domain period and subframe position for a certain UE to send the SRS. Taking I _SRS = 17 in Table 7 as an example, as shown in Figure 6, S in the figure means to send an SRS in this subframe, then the UE sends an SRS every 20ms, and its time domain position is on the first subframe within 20ms send.

Table 7: UE Specific SRS Periodicity T _SRS and Subframe Offset Configuration T _offset , FDD

(FDD system UE-specific period and subframe offset) SRS ConfigurationIndex I _SRS SRS configuration index SRS PeriodicityT _SRS (ms) SRS period SRS Subframe OffsetT _offset SRS subframe offset 0-1 2 I _SRS 2-6 5 I _SRS -2 7-16 10 I _SRS -7 17-36 20 I _SRS -17 37-76 40 I _SRS -37 77-156 80 I _SRS -77 157-316 160 I _SRS -157 317-636 320 I _SRS -317 637-1023 reserved reserved

Table 8: UE Specific SRS Periodicity T _SRS and Subframe Offset Configuration T _offset , TDD

(TDD system UE-specific period and subframe offset)

Configuration IndexI _SRS SRS configuration index SRS PeriodicityT _SRS (ms) SRS period SRS Subframe OffsetT _offset SRS subframe offset 0 2 0, 1 1 2 0, 2 2 2 1, 2 3 2 0, 3 4 2 1, 3 5 2 0, 4 6 2 1, 4 7 2 2,3 8 2 2,4 9 2 3,4 10-14 5 I _SRS -10 15-24 10 I _SRS -15 25-44 20 I _SRS -25 45-84 40 I _SRS -45 85-164 80 I _SRS -85 165-324 160 I _SRS -165 325-644 320 I _SRS -325 645-1023 reserved reserved

Long Term Evolution Advanced (LTE-Advanced) (Further Advancements for E-UTRA) is an evolved version of LTE. In addition to meeting or exceeding 3GPPTR 25.913: "Requirements for Evolved UTRA (E-UTRA) and Evolved UTRAN (E-UTRAN) (Evolved Universal Terrestrial Radio Access and Evolved Universal Terrestrial Radio Access Network requirements)" All relevant requirements , but also to meet or exceed the advanced International Mobile Telecommunications (IMT-Advanced) requirements proposed by the International Telecommunication Union (ITU-R). Wherein, the requirement of being backward compatible with LTE means that: an LTE terminal can work in an LTE-Advanced network; an LTE-Advanced terminal can work in an LTE network.

In addition, LTE-Advanced should be able to work in spectrum configurations of different sizes, including spectrum configurations wider than LTE (such as 100MHz continuous spectrum resources), so as to achieve higher performance and target peak rate. Since the LTE-Advanced network needs to be able to access LTE users, its operating frequency band needs to cover the current LTE frequency band. There is no continuous 100MHz spectrum bandwidth that can be allocated in this frequency band. Therefore, a direct technology that LTE-Advanced needs to solve is to aggregate several continuous component carriers (Component carriers) distributed in different frequency bands to form the 100MHz bandwidth that LTE-Advanced can use. That is, the aggregated spectrum is divided into n component carriers, and the spectrum in each component carrier is continuous.

There are mainly three schemes for spectrum configuration, as shown in Figure 7. Wherein, the grid part is the system bandwidth compatible with LTE, and the oblique part is the LTE-Advanced exclusive system bandwidth. Fig. 7a shows the spectrum configuration scheme 1, which means that the LTE-Advanced spectrum configuration consists of one system bandwidth defined by LTE-Advanced, and the bandwidth is larger than the system bandwidth defined by LTE. Figure 7b shows the spectrum configuration scheme 2, which means that the LTE-Advanced spectrum configuration consists of one LTE-defined system bandwidth and multiple LTE-Advanced-defined system bandwidths through carrier aggregation (carrier aggregation). Figure 7c shows the spectrum configuration scheme 3, which means that the LTE-Advanced spectrum configuration is composed of multiple LTE-defined system bandwidths through carrier aggregation, where the above-mentioned carrier aggregation can be the aggregation of continuous spectrum or the aggregation of discontinuous spectrum. LTE UEs can access LTE-compatible frequency bands, and LTE-A UEs can access either LTE-compatible frequency bands or LTE-Advanced frequency bands.

Considering the compatibility with LTE, each component carrier of LTE-Advanced needs to meet the capability of sending SRS in uplink. The existing technology has not yet solved the problem of how UE sends SRS on multiple uplink component carriers when carrier aggregation is adopted, so it is urgent to design an SRS sending method that can maintain compatibility with LTE UE and flexibly configure LTE-Advanced UE.

Contents of the invention

The technical problem to be solved by the present invention is to propose a method for sending measurement reference signals in the case of carrier aggregation, to solve the problem of how UE sends SRS on multiple uplink component carriers when carrier aggregation is used, and to maintain compatibility with LTE UE.

In order to solve the above-mentioned technical problems, the present invention provides a method for sending a measurement reference signal in the case of carrier aggregation, which is applied to an advanced long-term evolution system, including:

The base station configures one or more sets of measurement reference signal configuration parameters for the uplink component carriers that the user equipment needs to measure under carrier aggregation, and sends them to the user equipment;

The user equipment sends the measurement reference signal to the base station according to the received configuration parameters of the measurement reference signal.

Further, the above sending method may also have the following characteristics:

The base station configures a set of measurement reference signal configuration parameters for one uplink component carrier and/or configures a set of measurement reference signal configuration parameters for multiple uplink component carriers.

Further, the above sending method may also have the following characteristics:

The base station sends a set of measurement reference signal configuration parameters to the user equipment on the downlink component carrier agreed with the user equipment.

Further, the above sending method may also have the following characteristics:

The measurement reference signal configuration parameters are used to configure the measurement reference signal sent on the uplink component carrier, including one or more of the following combinations:

A cell-specific measurement reference signal bandwidth configuration index on the uplink component carrier;

The bandwidth index of the measurement reference signal dedicated to the user equipment on the uplink component carrier;

The starting position of the measurement reference signal bandwidth dedicated to the user equipment on the uplink component carrier;

A cell-specific measurement reference signal cycle and subframe offset on the uplink component carrier;

The user equipment-specific measurement reference signal period and subframe offset on the uplink component carrier;

a frequency comb on the uplink component carrier;

frequency hopping bandwidth configuration on the uplink component carrier;

The cyclic shift on the uplink component carrier.

Further, the above sending method may also have the following characteristics:

The user equipment determines, according to the measurement reference signal configuration parameters, the frequency domain transmission position and/or the time domain transmission position and/or the measurement reference signal bandwidth and/or cyclic shift for transmitting the measurement reference signal on the uplink component carrier, and transmits the measurement reference signal Reference signal to the base station.

Further, the above sending method may also have the following characteristics:

On an uplink component carrier, the user equipment only sends the measurement reference signal on the last single carrier frequency division multiplexing symbol of the subframe.

In order to solve the above technical problems, the present invention also provides a measurement reference signal transmission device in the case of carrier aggregation, which is applied to an advanced long-term evolution system, including a base station and a user equipment,

The base station includes a connected configuration module and a sending module,

The configuration module is configured to configure one or more sets of measurement reference signal configuration parameters for uplink component carriers that need to be measured by the user equipment under carrier aggregation;

The sending module is used to send the measurement reference signal configuration parameters configured by the configuration module to the user equipment;

The user equipment is configured to send a measurement reference signal to the base station according to the received measurement reference signal configuration parameters.

Further, the above sending device may also have the following characteristics:

The configuration module is configured to configure a set of measurement reference signal configuration parameters for one uplink component carrier and/or configure a set of configuration parameters for multiple uplink component carriers.

Further, the above sending device may also have the following characteristics:

The sending module is further configured to send a set of measurement reference signal configuration parameters to the user equipment on a downlink component carrier agreed with the user equipment.

Further, the above sending device may also have the following characteristics:

The measurement reference signal configuration parameters configured by the configuration module include one or a combination of the following:

A cell-specific measurement reference signal bandwidth configuration index on the uplink component carrier;

The bandwidth index of the measurement reference signal dedicated to the user equipment on the uplink component carrier;

The starting position of the measurement reference signal bandwidth dedicated to the user equipment on the uplink component carrier;

A cell-specific measurement reference signal cycle and subframe offset on the uplink component carrier;

The user equipment-specific measurement reference signal period and subframe offset on the uplink component carrier;

a frequency comb on the uplink component carrier;

frequency hopping bandwidth configuration on the uplink component carrier;

The cyclic shift on the uplink component carrier.

Further, the above sending device may also have the following characteristics:

The user equipment is configured to determine, according to the measurement reference signal configuration parameters, a frequency-domain transmission position and/or a time-domain transmission position and/or a measurement reference signal bandwidth and/or a cyclic shift for transmitting the measurement reference signal on the uplink component carrier bit, and send a measurement reference signal to the base station.

Further, the above sending device may also have the following characteristics:

The user equipment is configured to send the measurement reference signal to the base station only on the last single carrier frequency division multiplexing symbol of the subframe.

The present invention can maintain compatibility with LTE UEs, and can flexibly and independently configure SRSs on each uplink component carrier according to requirements, thereby increasing the utilization efficiency of sent SRSs, that is, it can optimize LTE-Advanced UEs under the use of carrier aggregation technology Send the performance of the measurement signal.

Description of drawings

Fig. 1 is a schematic diagram of a tree structure of LTE system SRS bandwidth configuration;

FIG. 2 is a schematic diagram of SRS frequency comb transmission in an LTE system;

Fig. 3 is that UE of LTE system determines the initial bandwidth position of sending SRS according to the received upper layer signaling n _RRC ;

Fig. 4 is the frequency hopping bandwidth area of the SRS determined by the UE of the LTE system according to the received upper layer signaling b _hop ;

FIG. 5 is a schematic diagram of a cell-specific SRS transmission period (T _SFC ) and a subframe offset (Δ _SFC ) of an LTE system;

6 is a schematic diagram of UE-specific SRS transmission period (T _SRS ) and subframe offset (T _offset ) of the LTE system;

FIG. 7 is a schematic diagram of carrier aggregation spectrum configuration in an LTE-Advanced system;

Fig. 8 is a method flowchart of an embodiment of the present invention;

Fig. 9 is a schematic diagram of a device according to an embodiment of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 8, the method of the embodiment of the present invention includes the following steps:

Step 801, the base station configures one or more sets of SRS configuration parameters for the uplink component carriers that the UE needs to measure under carrier aggregation, and sends them to the UE;

Specifically, the base station may configure a set of SRS configuration parameters for one uplink component carrier, or configure a set of SRS configuration parameters for multiple uplink component carriers;

The SRS configuration parameters are used to configure the SRS sent on the uplink component carrier;

The SRS configuration parameters include (but are not limited to) one or more of the following:

● A cell-specific SRS bandwidth configuration index on the uplink component carrier;

● UE-specific SRS bandwidth index on the uplink component carrier;

●The start position of the UE-specific SRS bandwidth on the uplink component carrier;

● cell-specific SRS period and subframe offset on the uplink component carrier;

● UE-specific SRS period and subframe offset on the uplink component carrier;

● a frequency comb (frequency comb) on the uplink component carrier;

●Frequency hopping bandwidth configuration b _hop on the uplink component carrier;

● A cyclic shift α on the uplink component carrier.

Further explanation:

The cell-specific SRS period and subframe offset on an uplink component carrier give the time-domain subframe positions where all UEs in the cell on the uplink component carrier may send SRS;

The UE-specific SRS period and subframe offset on an uplink component carrier provide the time domain period and subframe position for a UE to send SRS on the uplink component carrier.

Each group of SRS configuration parameters is sent on a specific downlink component carrier. Specifically, the base station sends a group of SRS configuration parameters to the UE on a downlink component carrier agreed with the UE.

Step 802, the UE sends an SRS to the base station according to the received SRS configuration parameters.

Specifically, the UE determines the frequency domain transmission position and/or the time domain transmission position and/or the SRS bandwidth and/or the cyclic shift for transmitting the SRS on the uplink component carrier according to the SRS configuration parameters, and sends the SRS to the base station.

Specifically, the UE determines the SRS bandwidth configuration currently used by the uplink component carrier by looking up a table according to the number of resource blocks corresponding to the bandwidth of the uplink component carrier and the cell-specific SRS bandwidth configuration index on the uplink component carrier notified by the base station;

The UE looks up a table to obtain its SRS bandwidth on the uplink component carrier according to the SRS bandwidth configuration of the uplink component carrier and the UE-specific UE-specific SRS bandwidth index of the uplink component carrier;

Further, on an uplink component carrier, the UE only sends the SRS on the last SC-FDMA symbol of the subframe.

As shown in FIG. 9, the sending device in the embodiment of the present invention includes a base station and a UE,

Wherein, the base station includes a connected configuration module and a sending module,

The configuration module is used to configure one or more sets of SRS configuration parameters for the uplink component carriers that the UE needs to measure under carrier aggregation;

The sending module is used to send the SRS configuration parameters configured by the configuration module to the UE;

The UE is configured to send an SRS to the base station according to the received SRS configuration parameters.

The configuration module is further configured to configure a set of SRS configuration parameters for one uplink component carrier and/or configure a set of SRS configuration parameters for multiple uplink component carriers.

The SRS configuration parameters configured by the configuration module include (but are not limited to) one or more of the following:

A cell-specific SRS bandwidth configuration index on the uplink component carrier;

UE-specific SRS bandwidth index on the uplink component carrier;

The starting position of UE-specific SRS bandwidth on the uplink component carrier;

The SRS period and subframe offset of the cell-specifc on the uplink component carrier;

UE-specific SRS period and subframe offset on the uplink component carrier;

a frequency comb on the uplink component carrier;

frequency hopping bandwidth configuration on the uplink component carrier;

The cyclic shift on the uplink component carrier.

The sending module is further configured to send each set of SRS configuration parameters to the UE on a downlink component carrier agreed with the UE.

The UE determines, according to the SRS configuration parameters, the frequency domain transmission position and/or the time domain transmission position and/or the SRS bandwidth for transmitting the SRS on the uplink component carrier, and sends the SRS to the base station.

On an uplink component carrier, the UE is further configured to send the SRS to the base station only on the last SC-FDMA symbol of the subframe.

The following is a detailed description of a specific application example:

In the LTE-Advanced system, the base station configures a set of SRS configuration parameters for each uplink component carrier participating in carrier aggregation. A set of SRS configuration parameters corresponds to a downlink component carrier, and the base station uses the SRS configuration parameters in its corresponding downlink component carrier. The carrier sends to the UE; the UE sends the SRS on the corresponding uplink component carrier according to the SRS configuration parameters.

The base station sets an uplink component carrier-specific SRS bandwidth configuration for each uplink component carrier, and the SRS configuration parameters include one or more of the following:

● A cell-specific SRS bandwidth configuration index on the uplink component carrier;

● UE-specific SRS bandwidth index on the uplink component carrier;

●The starting position of the UE-specific SRS bandwidth on the uplink component carrier;

● The cell-specific SRS period and subframe offset on the uplink component carrier;

● UE-specific SRS period and subframe offset on the uplink component carrier;

●A frequency comb on the uplink component carrier;

●Frequency hopping bandwidth configuration on the uplink component carrier;

● A cyclic shift α on the uplink component carrier.

In the LTE-Advanced system, the base station first allocates a carrier-specific SRS bandwidth configuration index C _{SRS,m for accessing each uplink component carrier for all UEs in the cell,} where m represents the component carrier index. For component carrier m, select a table from Table 1 to Table 4 according to the number of RBs (N _RB ^UL ) corresponding to the current component carrier bandwidth, and then determine the SRS bandwidth of the uplink component carrier according to C _SRS,m preparation.

For a certain UE, the base station allocates a carrier-specific SRS bandwidth index B _{SRS, m} (or called the index of the layer where it resides) for each uplink component carrier on which it resides, where m represents the component carrier index. According to the carrier-specific SRS bandwidth configuration index C _SRS,m of the component carrier and the carrier-specific SRS bandwidth index B _SRS,m of the UE on the component carrier, the UE obtains the SRS bandwidth it uses on the camping carrier. For example, the current UE camps on the No. 1 uplink component carrier, and the carrier-specific SRS bandwidth configuration index C _{SRS of the component carrier, 1} = 1, and the number of RBs of the No. 1 uplink component carrier is 50, then the SRS bandwidth of the uplink component carrier Formulated as the second row in Table 2. If the carrier-specific SRS bandwidth index assigned by the current base station to a UE on the uplink component carrier No. 1 is 1, the UE occupies 16 RBs in the SRS frequency band of the uplink component carrier, and the SRS bandwidth of the UE is located in Within the range of the SRS bandwidth of the uplink component carrier (that is, the range of the maximum SRS bandwidth, which is 48 RBs).

From the perspective of the frequency domain, the UE knows the SRS bandwidth transmitted on a certain uplink component carrier, and the n _RRC knows the initial position in the frequency domain for sending the SRS on the uplink component carrier according to the SRS configuration parameters sent by the base station, and according to the SRS configuration sent by the base station In the parameter b _hop , the frequency hopping bandwidth area for sending the SRS is known, and the UE sends the SRS in a frequency hopping manner within the frequency hopping bandwidth area according to the tree structure.

From the perspective of the time domain, the UE only sends SRS on the last SC-FDMA symbol of the subframe;

The configuration of UE sending SRS in the time domain of an uplink component carrier is related to four parameters: the cell-specific SRS period (T _{SFC, m} ) and SRS subframe offset (Δ _{SFC, m} ) on the uplink component carrier, and the uplink UE-specific carrier SRS transmission period (T _{SRS, m} ) and SRS subframe offset (T _{offset, m} ) on the component carrier. The cell-specific SRS period and SRS subframe offset on each carrier give the time-domain subframe positions where all UEs residing on the uplink component carrier may send SRS. Taking srsSubframeConfiguration=7 in Table 5 as an example, the cell-specific SRS transmission period of the uplink component carrier is 5 subframes, and the positions of subframe 0 and subframe 1 in each period can be used by the UE to transmit SRS. In each uplink component carrier, the UE-specific SRS transmission period T _SRS,m and the SRS subframe offset parameter T _offset,m give the time domain period and subframe position for a specific UE to transmit SRS. Taking I _SRS =17 in Table 7 as an example, the UE sends an SRS reference signal every 20ms on this component carrier, and its time domain position is sent on the first subframe within 20ms.

The present invention can ensure the compatibility between the LTE-Advanced system and the LTE system, enable the LTE UE to access the LTE-Advanced network, and maintain the flexibility of designing the LTE-Advanced UE.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (12)

1, a kind of sending method of measure-reference signal under state of carrier aggregation is applied to comprise in the advanced long-term evolution system:

The base station is that the upstream components carrier wave that subscriber equipment need be measured under the carrier aggregation disposes one or more groups measuring reference signals configuration parameter, sends to subscriber equipment;

Subscriber equipment sends measuring reference signals to described base station according to the described measuring reference signals configuration parameter that receives.

2, sending method as claimed in claim 1 is characterized in that,

The base station is that a upstream components carrier wave disposes one group of measuring reference signals configuration parameter and/or disposes one group of measuring reference signals configuration parameter for a plurality of upstream components carrier waves.

3, sending method as claimed in claim 1 is characterized in that,

The base station sends to described subscriber equipment with one group of measuring reference signals configuration parameter on a descending component carrier of appointing with subscriber equipment.

4, sending method as claimed in claim 1 is characterized in that,

Described measuring reference signals configuration parameter is used for the measuring reference signals that sends on the collocating uplink component carrier, comprises following one or more combination:

The measuring reference signals band width configuration index of cell-specific on the described upstream components carrier wave;

The measuring reference signals bandwidth index of user equipment specific on the described upstream components carrier wave;

The measuring reference signals bandwidth original position of user equipment specific on the described upstream components carrier wave;

The measuring reference signals cycle and the sub-frame offset of cell-specific on the described upstream components carrier wave;

The measuring reference signals cycle and the sub-frame offset of user equipment specific on the described upstream components carrier wave;

Frequency comb on the described upstream components carrier wave;

Frequency hopping band width configuration on the described upstream components carrier wave;

Cyclic shift on the described upstream components carrier wave.

5, as any described sending method in the claim 1～4, it is characterized in that,

Subscriber equipment determines that according to described measuring reference signals configuration parameter the frequency domain that sends measuring reference signals on described upstream components carrier wave sends position and/or time domain transmission position and/or measuring reference signals bandwidth and/or cyclic shift, sends measuring reference signals to described base station.

6, the sending method described in claim 5 is characterized in that,

On a upstream components carrier wave, subscriber equipment only sends measuring reference signals on last single carrier frequency division multiplexed symbols of subframe.

7, a kind of dispensing device of measure-reference signal under state of carrier aggregation is applied to advanced long-term evolution system, comprises base station and subscriber equipment, it is characterized in that,

Described base station comprises continuous configuration module and sending module,

Described configuration module is used to the upstream components carrier wave that subscriber equipment need be measured under the carrier aggregation to dispose one or more groups measuring reference signals configuration parameter;

Described sending module is used for the measuring reference signals configuration parameter of configuration module configuration is sent to subscriber equipment;

Described subscriber equipment is used for according to the described measuring reference signals configuration parameter that receives, and sends measuring reference signals to described base station.

8, dispensing device as claimed in claim 7 is characterized in that,

Described configuration module is used to a upstream components carrier wave to dispose one group of measuring reference signals configuration parameter and/or disposes a set of configuration parameters for a plurality of upstream components carrier waves.

9, dispensing device as claimed in claim 7 is characterized in that,

Described sending module also is used for one group of measuring reference signals configuration parameter is sent to described subscriber equipment on a downlink component carrier of appointing with subscriber equipment.

10, dispensing device as claimed in claim 7 is characterized in that,

The measuring reference signals configuration parameter of described configuration module configuration comprises following one or more combination:

The measuring reference signals band width configuration index of cell-specific on the described upstream components carrier wave;

The measuring reference signals bandwidth index of user equipment specific on the described upstream components carrier wave;

The measuring reference signals bandwidth original position of user equipment specific on the described upstream components carrier wave;

The measuring reference signals cycle and the sub-frame offset of cell-specific on the described upstream components carrier wave;

The measuring reference signals cycle and the sub-frame offset of user equipment specific on the described upstream components carrier wave;

Frequency comb on the described upstream components carrier wave;

Frequency hopping band width configuration on the described upstream components carrier wave;

Cyclic shift on the described upstream components carrier wave.

11, as any described dispensing device in the claim 7～10, it is characterized in that,

Described subscriber equipment is used for determining that according to described measuring reference signals configuration parameter the frequency domain that sends measuring reference signals on described upstream components carrier wave sends position and/or time domain transmission position and/or measuring reference signals bandwidth and/or cyclic shift, sends measuring reference signals to described base station.

12, the dispensing device described in claim 11 is characterized in that,

Described subscriber equipment is used for only sending measuring reference signals to the base station on last single carrier frequency division multiplexed symbols of subframe.

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