CN101877865B - Method and system for sending measurement reference signal, base station and relay station - Google Patents
Method and system for sending measurement reference signal, base station and relay station Download PDFInfo
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- CN101877865B CN101877865B CN200910083293.3A CN200910083293A CN101877865B CN 101877865 B CN101877865 B CN 101877865B CN 200910083293 A CN200910083293 A CN 200910083293A CN 101877865 B CN101877865 B CN 101877865B
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Abstract
The invention provides a method and a system for sending a measurement reference signal. The invention adopts the technical scheme that the configuration information of a relay station for sending a measurement reference signal is set in a base station, and the relay station is used for generating the measurement reference signal and sending the generated measurement reference signal according to the received configuration information for sending the measurement reference signal, wherein the configuration information is used for the relay station for determining the sub-frame position information sent by the measurement reference signal, and the measurement reference signal of the relay station and the measurement reference signal of the base station are sent in a time division mode. Through the technical scheme, the scheme of issuing the configuration information by the base station and sending the measurement reference signal by the relay station is provided in an LTE-A (Long Term Evolution-Advanced) system of the relay station without an independent PCID (Physical Cell Identity), thereby realizing the measurement of channel conditions from the relay station to a UE (User Equipment) link of the UE. The invention also provides the base station and the relay station, which realize the method for sending the measurement reference signal.
Description
Technical field
The present invention relates to senior long term evolution (LTE-A, LTE-Advanced) systems technology, espespecially a kind of method, system and base station for sending measuring reference signals and relay station.
Background technology
The demand for development of mobile communication can support higher transmission rate, more perfect signal is covered and higher resource utilization.In order to reach high transmission rate, next generation mobile communication system will transmit signal using higher frequency bandwidth, and higher frequency bandwidth will bring bigger path loss simultaneously, influence the network coverage.Relaying (Relay) technology can increase covering and balance, increase cell throughout, and relay station is compared to base station, with relatively small deployment cost.Therefore, the evolution system that relaying technique is considered as Long Term Evolution (LTE, Long Term Evolution) is a key technology in lte-a system.
According to the repetition policy of the relay station described in current 3GPP technical reports TR 36.814, relay station can be divided into two kinds：A kind of relay station has independent Physical Cell Identifier number (PCID, Physical CellIdentity), relay station independent control one or several cells；Another relay station itself does not have independent PCID, and relay station is a part for its main plot.
In LTE system, the resource of up-downgoing is divided on time orientation in units of frame.Fig. 1 is the composition structural representation of radio frames in LTE system, as shown in figure 1, the length of each radio frames is 10ms, comprising the subframe that 10 length are 1ms, subframe number is 0~9.As LTE evolution system, lte-a system is used and LTE system identical wireless frame structure.
In LTE system, base station sends public reference signal (CRS, Cell-specificReference Signal, also known as public guide frequency) in each subframe, user equipment (UE, User Equipment) carries out channel conditions measurement and the coherent demodulation of data using CRS.In order to avoid the CRS of neighbor cell is mapped in same frequency resource and causes to interfere, CRS is associated with the PCID of cell in the absolute position of frequency domain mapping.Because CRS is associated with the PCID of cell in the absolute position of frequency domain, when relay station itself does not have independent PCID, relay station can only determine absolute positions of the CRS in frequency domain of relay station using the PCID of current area.Now, if relay station sends CRS, the CRS of relay station will collide with the CRS of main plot, so that UE can not carry out the measurement of channel conditions, the failure for causing channel conditions to measure using the CRS of relay station.
For LTE system, the transmission antenna number of base station is by from most 4 ports-Extendings of LTE system to most 8 ports in lte-a system.Therefore new channel measurement reference signal (CSI-RS is introduced in lte-a system, Channel State Information-Reference Signal), base station sends CSI-RS with defined pattern and sequential, LTE-A UE measure base station to the channel condition information (CSI, Channel State Information) of UE links based on the CSI-RS received.
At present, in lte-a system, for the relay station without independent PCID, do not provide base station and relay station sends the scheme of measuring reference signals so that UE can not complete relay station to the measurement of the channel conditions of UE links.
The content of the invention
In view of this, it is a primary object of the present invention to provide a kind of method for sending measuring reference signals, in the case where relay station does not have independent PCID there is provided the scheme that relay station sends measuring reference signals, so as to realize measurements of the UE to channel conditions.
Another object of the present invention is to provide a kind of system for sending measuring reference signals, in the case where relay station does not have independent PCID there is provided the scheme that relay station sends measuring reference signals, so as to realize measurements of the UE to channel conditions.
A further object of the present invention is to provide a kind of base station, in the case where relay station does not have independent PCID, is capable of the configuration information of reasonable disposition relay station transmission channel measurement reference signal.
It is still another object of the present invention to provide a kind of relay station, in the case where relay station does not have independent PCID there is provided the scheme that relay station sends measuring reference signals, so as to realize measurements of the UE to channel conditions.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
A kind of method for sending measuring reference signals, this method includes：
Base station sets relay station to send the configuration information of measuring reference signals and be handed down to relay station；Relay station generates measuring reference signals, and the measuring reference signals generated are sent according to the configuration information of the transmission measuring reference signals received.
The configuration information determines the subframe position information that measuring reference signals are sent for relay station, and the measuring reference signals of the relay station and the measuring reference signals of base station are sent in the way of the time-division；The time division way is：Relay station and base station send measuring reference signals in different subframes respectively.
When the relay station is for two or more and in the same cell, different relay station measuring reference signals are sent in the way of the time-division；The time division way is：Different relay stations sends the measuring reference signals in different subframes respectively.
The base station sets the method for the configuration information that relay station sends measuring reference signals to be：The base station sends the configuration information of measuring reference signals based on the relay station number in current area, actual itself CSI-RS of measurement demand and base station transmission cycle and subframe position, configuration relay station.
When the relay station periodically sends the measuring reference signals, the configuration information includes relay station and sends the starting subframe position of measuring reference signals, sends the cycle；Or, the configuration information is the specific subframe numbers that relay station sends measuring reference signals；
When the relay station aperiodicity sends the measuring reference signals, the configuration information is the specific subframe numbers that relay station sends measuring reference signals；Or, the configuration information is that the subframe position for sending measuring reference signals is obtained according to preparatory condition, and the preparatory condition is：Relay station is sent in base station postponed on CSI-RS position preset number subframe position transmission measuring reference signals；
When the measuring reference signals of different relay stations in same cell are located in same subframe and are sent using frequency division multiplexing mode, the configuration information further includes the configured information for sending band information or transmission band information of each relay station measuring reference signals, and the configured information is used for the band information that each relay station obtains transmission measuring reference signals；
Or, when the measuring reference signals of different relay stations in same cell are located in same subframe and are sent using code division multiplexing mode, code information or the configured information of code information that the configuration information is further used comprising each relay station measuring reference signals, the configured information are used for each relay station and obtain the code information that measuring reference signals are used.
In the control information that the configuration information is sent included in the base station to relay station.
The measuring reference signals of the relay station and the CSI-RS of base station in same cell where it have identical pattern and identical sequence；Or, when the antenna port number of the relay station is different from the corresponding antenna port numbers of CSI-RS of the base station, the measuring reference signals of the relay station and the CSI-RS of base station in same cell have the pattern differed；
When the corresponding antenna port numbers of the CSI-RS that the antenna port number of the relay station is different from the base station, this method also includes：The base station is sent for indicating that relay station sends the identification information of the subframe position of measuring reference signals by downlink signaling to user equipment.
It is described send measuring reference signals method be：
When the configuration information includes sending the starting subframe position of measuring reference signals, transmission cycle, since the relay station periodically send the measuring reference signals originating subframe position；
When the configuration information is the specific subframe numbers that relay station sends measuring reference signals, or the configuration information of measuring reference signals is sent to obtain the subframe position of transmission measuring reference signals according to preparatory condition, the relay station sends the measuring reference signals in specified subframe.
This method also includes：When the measuring reference signals and the CSI-RS of base station in same cell where it of the relay station have identical pattern and identical sequence, the base station indicates the transmission cycle of measuring reference signals in current area to user equipment (UE).
The relay station indicated in the configuration information is sent at the resource location of measuring reference signals, and the base station does not send any information；At the resource location that the relay station sends measuring reference signals, other relay stations in affiliated same cell do not send any information.
A kind of method that base station issues configuration information, this method includes：
Based on the relay station number in current area, actual measurement demand and itself CSI-RS transmission cycle and subframe position, configuration relay station sends the configuration information of measuring reference signals；
The configuration information that the relay station configured is sent into measuring reference signals is carried to be issued to relay station in the control information.
A kind of method that relay station sends measuring reference signals, this method includes：
Measuring reference signals are generated, the configuration information of measuring reference signals is sent according to the relay station from base station, the subframe position that measuring reference signals are sent is determined；
The measuring reference signals of generation are sent in the subframe position that the measuring reference signals determined are sent.
A kind of system for sending measuring reference signals, the system at least includes：Base station and one or more relay stations；
Wherein, base station, for setting relay station to send the configuration information of measuring reference signals, and is handed down to relay station；
Relay station, measuring reference signals are sent for the configuration information according to the transmission measuring reference signals received；
The configuration information determines the subframe position information that measuring reference signals are sent for relay station, and the measuring reference signals of the relay station and the measuring reference signals of base station are sent in the way of the time-division；The time division way is：Relay station and base station send measuring reference signals in different subframes respectively.
The base station at least includes configuration information generation unit and configuration information transmitting element, wherein,
Configuration information generation unit, for based on the relay station number in current area, actual measurement demand and itself CSI-RS transmission cycle and subframe position, configuration relay station to send the configuration information of measuring reference signals；
Configuration information transmitting element, the configuration information carrying for the relay station configured to be sent to measuring reference signals is issued to relay station in the control information.
The relay station at least includes reference signal generation unit and reference signal transmitting element, wherein,
Reference signal generation unit, for generating measuring reference signals, the configuration information of measuring reference signals is sent according to the relay station from the configuration information transmitting element, determines the subframe position that measuring reference signals are sent；
The measuring reference signals of reference signal generation unit generation are sent in reference signal transmitting element, the subframe position that the measuring reference signals for being determined in reference signal generation unit are sent.
A kind of base station, at least including configuration information generation unit and configuration information transmitting element, wherein,
Configuration information generation unit, for based on the relay station number in current area, actual measurement demand and itself CSI-RS transmission cycle and subframe position, configuration relay station to send the configuration information of measuring reference signals；
Configuration information transmitting element, the configuration information carrying for the relay station configured to be sent to measuring reference signals is issued to relay station in the control information.
A kind of relay station, at least including reference signal generation unit and reference signal transmitting element, wherein,
Reference signal generation unit, for generating measuring reference signals, the configuration information of measuring reference signals is sent according to the relay station from base station, determines the subframe position that measuring reference signals are sent；
The measuring reference signals of reference signal generation unit generation are sent in reference signal transmitting element, the subframe position that the measuring reference signals for being determined in reference signal generation unit are sent.
The technical scheme provided from the invention described above includes, base station sets the configuration information of relay station transmission measuring reference signals, relay station generates measuring reference signals, and according to the configuration information of the transmission measuring reference signals received, the measuring reference signals of generation are sent in the way of the time-division between base station.The scheme provided by the present invention, issues configuration information there is provided base station in the lte-a system comprising the relay station without independent PCID and relay station sends the scheme of measuring reference signals, it is achieved thereby that measurements of the UE to relay station to UE link channel conditions.Measuring reference signals of the present invention by being further ensured that relay station reduce for the transparent of UE and introduce the influence that relay station is designed for UE.
Brief description of the drawings
Fig. 1 is the composition structural representation of radio frames in LTE system；
Fig. 2 sends the flow chart of the method for measuring reference signals for the present invention；
Fig. 3 is the composition structural representation for the system that the present invention sends measuring reference signals；
The sub-frame configuration schematic diagram that Fig. 4 is CSI-RS in the embodiment of the present invention one；
The sub-frame configuration schematic diagram that Fig. 5 is CSI-RS in the embodiment of the present invention two；
The sub-frame configuration schematic diagram that Fig. 6 is CSI-RS in the embodiment of the present invention three；
The sub-frame configuration schematic diagram that Fig. 7 is CSI-RS in the embodiment of the present invention four；
The sub-frame configuration schematic diagram that Fig. 8 is CSI-RS in the embodiment of the present invention five.
Embodiment
Fig. 2 sends the flow chart of the method for measuring reference signals for the present invention, as shown in Fig. 2 the inventive method comprises the following steps：
Step 200：Base station sets relay station to send the configuration information of measuring reference signals, and is handed down to relay station.
In lte-a system, the CSI-RS of base station is sent in the form of dutycycle, that is to say, that base station will not all send CSI-RS in each subframe.The configuration information determines the transmission subframe position of measuring reference signals for relay station, measuring reference signals are specially sent in the way of the time-division between relay station and base station, the time-division refers to that base station and relay station send CSI-RS in different subframes respectively, and this avoid interference is produced between the CSI-RS of base station and the CSI-RS of relay station.
When relay station is for two or more and in the same cell, measuring reference signals are sent in the way of the time-division between different relay stations；The time-division refers to that different relay stations send the measuring reference signals in different subframes respectively.
The configuration information that relay station sends CSI-RS includes the information such as transmission cycle (including periodically sending or aperiodicity transmission), subframe position.Specific method to set up includes：
Base station sends the configuration informations such as CSI-RS transmission cycle, subframe position based on the relay station number in current area, actual measurement demand and itself CSI-RS transmission cycle and subframe position, configuration relay station.The CSI-RS of relay station can periodically be sent or aperiodicity transmission.When using periodically CSI-RS is sent, the configuration information includes sending CSI-RS starting subframe position, sends the cycle；Or, the configuration information is the specific subframe numbers that relay station sends CSI-RS.When sending CSI-RS using aperiodicity, the configuration information is the specific subframe numbers that relay station sends CSI-RS；Or, the configuration information sends CSI-RS subframe position to be obtained according to preparatory condition, such as preparatory condition sends in base station for relay station and postponed on CSI-RS position preset number subframe position transmission CSI-RS.
Base station issues relay station and sends the methods of configuration information of measuring reference signals：Base station issues the configuration information that relay station sends measuring reference signals by control information to relay station.
Step 201：Relay station generates measuring reference signals, and the measuring reference signals generated are sent according to the configuration information of the transmission measuring reference signals received.
Generating the method for measuring reference signals can be：Generation has the CSI-RS of identical pattern and identical sequence with the CSI-RS of base station in same cell where it；Or, when the antenna port number of relay station is different from the corresponding antenna port numbers of CSI-RS of base station, generation has the CSI-RS of the pattern differed with the CSI-RS of base station in same cell where it.
When the configuration information for sending measuring reference signals includes sending CSI-RS starting subframe position, transmission cycle, since relay station periodically send the CSI-RS originating subframe position；
When the configuration information for sending measuring reference signals is the specific subframe numbers that relay station sends CSI-RS, or when sending the configuration information of measuring reference signals to obtain the subframe position for sending CSI-RS according to preparatory condition, relay station sends the CSI-RS in specified subframe.
Further, when the measuring reference signals of different relay stations in same cell are located in same subframe and are sent using frequency division multiplexing mode, the configuration information further includes the configured information for sending band information or transmission band information of each relay station measuring reference signals, and the configured information is used for the band information that each relay station obtains transmission measuring reference signals.Or, when the measuring reference signals of different relay stations in same cell are located in same subframe and are sent using code division multiplexing mode, code information or the configured information of code information that the configuration information is further used comprising each relay station measuring reference signals, the configured information are used for each relay station and obtain the code information that measuring reference signals are used.
When sending CSI-RS, when the antenna port number of relay station antenna port number corresponding with the CSI-RS of base station is identical, the CSI-RS of relay station is preferably by the CSI-RS identicals pattern and sequence with base station；
When the corresponding antenna port numbers of the CSI-RS that the transmission antenna number of relay station is less than base station, the CSI-RS of relay station can use CSI-RS identicals pattern and sequence with base station to send, it would however also be possible to employ the pattern different from the CSI-RS of base station is sent.
The method provided by the present invention, LTE-AUE utilizes the CSI-RS from base station and each relay station, and itself is measured respectively between base station, and itself channel conditions between each relay station.
Correspondence the inventive method, a kind of system for sending measuring reference signals is also provided, Fig. 3 is the composition structural representation for the system that the present invention sends measuring reference signals, as shown in Figure 3, in the case where relay station does not have independent Physical Cell Identifier PCID, the system at least includes base station and one or more relay stations, wherein
Base station, for setting relay station to send the configuration information of measuring reference signals, and is handed down to relay station.
Relay station, measuring reference signals are sent for the configuration information according to the transmission measuring reference signals received.
As shown in Figure 3, base station at least includes configuration information generation unit and configuration information transmitting element, wherein, configuration information generation unit, for based on the relay station number in current area, actual measurement demand and itself CSI-RS transmission cycle and subframe position, configuration relay station to send the configuration information of measuring reference signals；Configuration information transmitting element, the configuration information for the relay station configured to be sent to measuring reference signals is issued by control information to relay station.
Relay station at least includes reference signal generation unit and reference signal transmitting element, wherein,
Reference signal generation unit, for generating measuring reference signals, the configuration information of measuring reference signals is sent according to the relay station received, determines the subframe position that measuring reference signals are sent.
The measuring reference signals of reference signal generation unit generation are sent in reference signal transmitting element, the subframe position that the measuring reference signals for being determined in reference signal generation unit are sent.
The inventive method is described in detail with reference to five embodiments.
Assuming that in lte-a system, comprising a base station and several relay stations in a cell, these relay stations all do not have independent PCID.Base station sends CSI-RS with certain dutycycle, and the length of this dutycycle is configurable, such as can be 2ms, or 5ms, or 10ms, or 20ms etc., namely every 2 subframes in base station, either 5 subframes or 10 subframes, or 20 subframes send CSI-RS etc..Assuming that each relay station in current area has relaying mark (ID, identity) information, relaying ID is different from PCID, and relaying ID is used to distinguish the different relay stations in same cell.
The sub-frame configuration schematic diagram that Fig. 4 is CSI-RS in the embodiment of the present invention one.In embodiment one, it is assumed that there are 8 antenna ports base station, corresponding CSI-RS also corresponds to 8 ports, and the CSI-RS of each port is that the CSI-RS of each mutually orthogonal i.e. port is not disturbed mutually.In embodiment one, it is assumed that comprising 3 relay stations in current area, each relay station is equipped with 8 antenna ports.
Assuming that the transmission cycle for the CSI-RS that base station is currently configured is 20ms, 0 work song frame of the base station in each transmission cycle sends CSI-RS, as shown in figure 4, the subframe position that base station sends CSI-RS represents that the subframe number in a transmission cycle is 0~19 with the filling of left oblique line.Relay station CSI-RS transmission is configured by base station, is implemented as follows.
Base station sends cycle and relay station to the relay station quantity in the measurement demand of UE link and current area according to itself CSI-RS's, determines that relay station sends CSI-RS configuration information and indicated to relay station.The configuration information can be carried to be issued in the control information that base station is sent to relay station.
In embodiment one, relay station is used and the base station identical transmission cycle is that 20ms sends CSI-RS.Specifically, in FDD (FDD, Frequency Division Duplex) pattern, CSI-RS is sent with identical sub-frame interval between relay station and base station, and each relay station；In time division duplex (TDD, Time Division Duplexing) pattern, relay station sends CSI-RS subframe position according to the position reasonable disposition of descending sub frame.
Assuming that base station sends CSI-RS in subframe 0, if current system is FDD duplex modes, then its CSI-RS transmissions position is arranged respectively in subframe 5,10 and 15 by base station according to 3 relay station ID sizes in current area, such as Fig. 4, is filled respectively with right oblique line, horizontal line filling and vertical line filling are represented；If current system is TDD modes, no matter because which kind of form is the subframe uplink-downlink configuration of present frame be, subframe 5,10 and 15 is all descending sub frame, then its CSI-RS transmissions position is arranged respectively in subframe 5,10 and 15 by 3 relay station ID sizes of the base station in current area, such as Fig. 4, filled respectively with right oblique line, horizontal line filling and vertical line filling are represented.Base station has been configured after the configuration information that above-mentioned relay station sends CSI-RS, and each relay station is handed down to by Downlink Control Information.As shown in figure 4, it is all 20ms that base station in current area and each relay station CSI-RS, which send the cycle, but all these CSI-RS in current area be equivalent to be 5ms the transmission cycle.
Further, during base station can be 5ms, and subframe 0 and 5 of the CSI-RS configurations in each radio frames to the current CSI-RS of the LTE-A UE instructions transmission cycle.So, ensure that the CSI-RS of relay station is transparent for LTE-A UE, that is, LTE-A UE, which are unaware of, to be currently configured the CSI-RS received in middle subframe 0 and 5 and comes from base station, also come from relay station, identifications of the LTE-AUE for relay station is avoided, reduces and introduces the influence that relay station is designed for UE.
Each relay station in relay station receives the configuration information that the relay station from base station sends CSI-RS, current area sends CSI-RS in subframe 5,10 and 15 respectively.In the present embodiment one, in order to which the CSI-RS for ensureing relay station can use identical sequence and identical pattern for the transparent of LTE-A UE, the CSI-RS of relay station transmission and the CSI-RS of base station transmission.
So, LTE-A UE are after CSI-RS is received, and carry out the measurement of channel condition information using the pilot frequency information and are fed back and (implement and belong to those skilled in the art's conventional techniques, and not related with the present invention, repeat no more here).In embodiment one, LTE-A UE can measure different relay stations in current area to information such as CQI, PMI and RI of UE link.
Further, in subframe 5,10 and 15 at the corresponding resource locations of CSI-RS of relay station, base station does not send any information；At the resource location that a certain relay station sends CSI-RS, any information is not sent with other relay stations belonging to the relay station in same cell, avoid between base station and relay station, and the CSI-RS between each relay station produces interference, it is ensured that UE carries out the accuracy of the measurement of channel condition information.
The sub-frame configuration schematic diagram that Fig. 5 is CSI-RS in the embodiment of the present invention two.In embodiment two, it is assumed that there are 8 antenna ports base station, corresponding CSI-RS also corresponds to 8 ports, and the CSI-RS of each port is mutually orthogonal.In embodiment two, it is assumed that comprising 4 relay stations in current area, each relay station is equipped with 4 antenna ports.
Assuming that the CSI-RS of the current base station configuration transmission cycle is 10ms, 0 work song frame of the base station in each radio frames sends CSI-RS, as shown in figure 5, the subframe position that base station sends CSI-RS represents that the subframe number in a radio frames is 0~9 with the filling of left oblique line.Relay station CSI-RS transmission is configured by base station, is implemented as follows.
Base station sends cycle and relay station to the relay station quantity in the measurement demand of UE link and current area according to itself CSI-RS's, determines that relay station sends CSI-RS configuration information and indicated to relay station.The configuration information can be carried to be issued in the control information that base station is sent to relay station.
In embodiment two, relay station is used and the base station identical transmission cycle is that 10ms sends CSI-RS.Specifically, in FDD modes, CSI-RS is sent with identical sub-frame interval between relay station and base station, and each relay station；In TDD modes, relay station sends CSI-RS subframe position according to descending sub frame position reasonable disposition.
Assuming that base station sends CSI-RS in subframe 0, if current system is FDD modes, then its CSI-RS transmissions position is arranged respectively in subframe 2,4,6 and 8 by 4 relay station ID sizes of the base station in current area, such as Fig. 5 (a), filled respectively with right oblique line, horizontal line is filled, vertical line filling and positive lattice filling are represented.If current system is TDD modes, and in the present embodiment two so that the subframe uplink-downlink configuration of present frame uses collocation form 2 as an example, then 4 relay station ID sizes of the base station in current area send its CSI-RS in 4 descending sub frames that position is arranged respectively at outside subframe 0, in such as descending sub frame 3,4,5 and 8, such as Fig. 5 (b), filled respectively with right oblique line, horizontal line is filled, vertical line filling and positive lattice filling are represented.Base station has been configured after the configuration information that above-mentioned relay station sends CSI-RS, and each relay station is handed down to by Downlink Control Information.As shown in figure 5, the CSI-RS transmission cycle is the equal of 2ms (FDD mode) in current area.
Further, base station can indicate that the current CSI-RS transmission cycle is 2ms to LTE-A UE, i.e. CSI-RS is located in 0,2,4,6 and 8 (FDD modes) in descending sub frame or 0,3,4,5 and 8 (TDD modes).So, ensure that the CSI-RS of relay station is transparent for LTE-A UE, that is, LTE-A UE are unaware of the CSI-RS received in subframe 0,2,4,6 and 8 (FDD modes) or 0,3,4,5 and 8 (TDD modes) and come from base station, relay station is also come from, reduces and introduces the influence that relay station is designed for UE.
Relay station in relay station receives the configuration information that the relay station from base station sends CSI-RS, current area sends CSI-RS in subframe 2,4,6 and 8 (FDD modes) or 3,4,5 and 8 (TDD modes) respectively.
In the present embodiment two, the antenna port number of relay station configuration is less than the corresponding antenna port numbers of base station CSI-RS.But in order to reuse base station CSI-RS to ensure relay station CSI-RS for the transparent of UE, relay station can send CSI-RS with the antenna port number of anolog base station.For example it is bright：Assuming that corresponding antenna port is P0~P7 in the CSI-RS patterns of base station, the antenna port of relay station is R0~R3.4 antenna ports corresponding and relay station with P0~P3 in CSI-RS patterns are also corresponding with P4~P7 in CSI-RS patterns respectively respectively for 4 antenna ports of relay station, and send CSI-RS.Equivalent to the CSI-RS compared to base station, the density of the CSI-RS of each antenna port of relay station in each transmission subframe adds one times.In the present embodiment two, in order to ensure the CSI-RS of relay station for the transparent of LTE-A UE, relay station corresponding ports of P0~P3 and P4~P7 in CSI-RS pattern use pilot frequency sequence identical sequence corresponding with each corresponding ports of base station CSI-RS.
So, LTE-A UE are after CSI-RS is received, and carry out the measurement of channel condition information using the pilot frequency information and are fed back and (implement and belong to those skilled in the art's conventional techniques, and not related with the present invention, repeat no more here).In embodiment two, LTE-A UE can accurately measure the different relay stations in current area to the CQI information of UE links.
Further, in subframe 2,4,6 and 8 (FDD modes) or 3,4,5 and 8 (TDD modes), at the corresponding resource locations of CSI-RS of relay station, base station does not send any information；At the resource location that a certain relay station sends CSI-RS, any information is not sent with other relay stations belonging to the relay station in same cell, avoid between base station and relay station, and the CSI-RS between each relay station produces interference, it is ensured that UE carries out the accuracy of the measurement of channel condition information.
The sub-frame configuration schematic diagram that Fig. 6 is CSI-RS in the embodiment of the present invention three.In embodiment three, it is assumed that there are 8 antenna ports base station, the channel measurement of its middle port 0~3 uses CRS, the CSI-RS of 4 ports of correspondence of port 4~7.The CSI-RS of each port is mutually orthogonal.In embodiment three, it is assumed that comprising 3 relay stations in current area, each relay station is equipped with 4 antenna ports.
Assuming that the CSI-RS of the current base station configuration transmission cycle is 10ms, 0 work song frame of the base station in each radio frames sends CSI-RS, as shown in Fig. 6 (a) and Fig. 6 (b), the subframe position that base station sends CSI-RS represents that the subframe number in a radio frames is 0~9 with the filling of left oblique line.
Base station sends cycle and relay station to the relay station quantity in the measurement demand of UE link and current area according to itself CSI-RS's, determines that relay station sends CSI-RS configuration information and indicated to relay station.The configuration information can be carried to be issued in the control information that base station is sent to relay station.
In embodiment three, relay station is used and the base station identical transmission cycle is that 10ms sends CSI-RS.Assuming that it is relay station according to preparatory condition that relay station, which sends CSI-RS configuration information, is sent in base station and postponed in CSI-RS subframe position several subframes and send CSI-RS.
Assuming that base station sends CSI-RS in subframe 0, and assume that preparatory condition is in the subframe position for sending CSI-RS in base station, each relay station is according to the size of own repeater ID, and the subframe that postpones successively sends CSI-RS.If current system is FDD modes, then its CSI-RS transmissions position is arranged respectively in subframe 1,2 and 3 by 3 relay station ID sizes of the base station in current area, as shown in Fig. 6 (a), filled respectively with right oblique line, horizontal line filling and vertical line filling are represented.If current system is TDD modes, and in the present embodiment three so that the subframe uplink-downlink configuration of present frame uses collocation form 2 as an example, then its CSI-RS transmissions position is arranged respectively in subframe 3,4 and 5 by 3 relay station ID sizes of the base station in current area, as shown in Fig. 6 (b), filled respectively with right oblique line, horizontal line filling and vertical line filling are represented.Base station has been configured after the configuration information that above-mentioned relay station sends CSI-RS, and each relay station is handed down to by Downlink Control Information.
Relay station in relay station receives the configuration information that the relay station from base station sends CSI-RS, current area sends CSI-RS in subframe 1,2 and 3 (FDD modes) or 3,4 and 5 (TDD modes) respectively.
In embodiment three, the antenna port number antenna port number corresponding with the CSI-RS of base station of relay station configuration is identical.In order to reuse base station CSI-RS as far as possible, the CSI-RS that the CSI-RS that relay station is sent is sent with base station can use identical sequence and identical pattern.In the present embodiment three, the corresponding ports of CSI-RS of base station are P4~P7, and the antenna port of relay station is R0~R3.The CSI-RS of 4 antenna port R0 of relay station~R3 difference respective base stations P4~P7 sends CSI-RS.
In the present embodiment three, the CSI-RS that the CSI-RS that relay station is sent is sent with base station can use identical sequence and identical pattern.But, LTE-AUE is in the channel conditions of measurement base station to UE, it is necessary to be realized with reference to CRS and CSI-RS；And in the measurements when the channel conditions at station to UE, need to only utilize the CSI-RS of relay station.Therefore, for UE, the CSI-RS of relay station is different from the CSI-RS of base station, in the present embodiment three, and relay station is opaque for LTE-A UE, that is to say, that UE needs to identify that CSI-RS is from relay station or from base station.In this case, base station needs additionally one special identification information of increase, and the CSI-RS for telling which subframe of UE is relay station.The identification information can be handed down to UE by downlink signaling such as control information.Such as in the present embodiment, base station indicates to need to carry out relay station in subframe 1,2 and 3 (FDD modes) or subframe 3,4 and 5 (TDD modes) in each radio frames to the channel measurement of UE links by Downlink Control Information to LTE-A UE.
So, LTE-A UE are after CSI-RS is received, and carry out the measurement of channel condition information using the pilot frequency information and are fed back and (implement and belong to those skilled in the art's conventional techniques, and not related with the present invention, repeat no more here).In embodiment three, LTE-A UE can accurately measure the different relay stations in current area to CQI, PMI, RI information of UE links.
Further, in subframe 1,2 and 3 (FDD modes) or 3,4 and 5 (TDD modes), at the corresponding resource locations of CSI-RS of relay station, base station does not send any information；At the resource location that a certain relay station sends CSI-RS, other relay stations do not send any information, it is to avoid the CSI-RS between base station and relay station and relay station produces interference, it is ensured that UE carries out the accuracy of channel condition information measurement.
The sub-frame configuration schematic diagram that Fig. 7 is CSI-RS in the embodiment of the present invention four.In example IV, it is assumed that base station there are 8 antenna ports, the CSI-RS of 8 ports is corresponded to, the CSI-RS of each port is mutually orthogonal.In example IV, it is assumed that comprising 3 relay stations in current area, each relay station is equipped with 8 antenna ports.
Assuming that the CSI-RS of the current base station configuration transmission cycle is 10ms, No. 1 (FDD mode) or No. 3 (TDD modes of the base station in each radio frames, so that subframe uplink-downlink configuration is collocation form 2 as an example) subframe transmission CSI-RS, as shown in Fig. 7 (a) and Fig. 7 (b), subframe position is represented with the filling of left oblique line.Relay station CSI-RS transmission is configured by base station, is implemented as follows.
Base station sends cycle and relay station to the relay station quantity in the measurement demand of UE link and current area according to itself CSI-RS's, determines that relay station sends CSI-RS configuration information and indicated to relay station.The configuration information can be carried to be issued in the control information that base station is sent to relay station.
In example IV, it is assumed that relay station is used and the base station identical transmission cycle is that 10ms sends CSI-RS, and the CSI-RS that the CSI-RS that relay station is sent is sent with base station can use identical sequence and identical pattern.Specifically, the CSI-RS of different relay stations is located in same subframe, and configure using frequency division by the way of transmission, that is to say, that the CSI-RS of different relay stations is in the different frequency bands of same subframe.In FDD modes, CSI-RS is sent with equal sub-frame interval between relay station and base station；In TDD modes, relay station sends CSI-RS subframe position according to the position reasonable disposition of descending sub frame.
In LTE, the CQI information of UE feedbacks is divided into broadband CQI and subband CQI.Broadband CQI is that reference signal (pilot tone) information based on the full bandwidth received calculates a CQI value, and subband CQI is that the pilot signal being directed in each subband received calculates a CQI value and fed back.Each subband includes several continuous Resource Block (RB, Resource Block) in frequency domain, and the RB specifically included number and system bandwidth and CQI feedback mode have relation.Assuming that current system bandwidth is 100 RB, the size of each CQI feedback subband is 8 RB under current feedback mode, then a total of
This 13 subbands are divided into 3 groups, each relay station sends CSI-RS in one group of subband respectively by individual subband.
If current system is FDD modes, it is assumed that base station sends CSI-RS in subframe 1, and its CSI-RS is sent position configuration in subframe 6 by 3 relay station ID sizes of the base station in current area, such as shown in Fig. 7 (a), is represented with the filling of right oblique line.If current system is TDD modes, and so that the subframe uplink-downlink configuration of present frame uses collocation form 2 as an example, assuming that base station sends CSI-RS in subframe 3, its CSI-RS transmissions position is arranged respectively in subframe 8 by base station according to 3 relay station ID sizes in current area, as shown in Fig. 7 (b), represented with the filling of right oblique line.As shown in Fig. 7 (a) and Fig. 7 (b), the CSI-RS transmission cycle is 5ms in current area.
The CSI-RS of different relay stations concrete configuration method is, in subframe 6 (FDD modes) or 8 (TDD modes), relay station 1 sends CSI-RS in subband 1,2,3,4, relay station 2 sends CSI-RS in subband 5,6,7,8, relay station 3 sends CSI-RS in subband 9,10,11,12,13, as in Fig. 7 (c), vertical line filling, the filling of positive lattice and oblique lattice filling respectively is represented.
Further, base station can indicate the current CSI-RS transmission cycle for 5ms to LTE-A UE, and CSI-RS is located in the subframe 1 and 6 (FDD modes) in each radio frames or 3 and 8 (TDD modes).This way it is ensured that the CSI-RS of relay station is transparent for LTE-A UE, that is to say, that LTE-A UE are unaware of received CSI-RS and come from base station, also coming from relay station, reduces and introduce the influence that relay station is designed for UE.
Relay station in relay station receives the configuration information that the relay station from base station sends CSI-RS, current area sends CSI-RS in subframe 6 (FDD modes) or 8 (TDD modes) in respective transmission subband respectively.
It is preferred that, the CSI-RS that the CSI-RS that relay station is sent is sent with base station can use identical sequence and identical pattern, it is ensured that the CSI-RS of relay station is transparent for LTE-A UE's.
So, LTE-A UE carry out the measurement of channel condition information using the pilot frequency information and fed back after CSI-RS is received.In the present embodiment four, LTE-A UE can accurately measure the CQI information that different relay stations in current area arrive UE links on some subbands.It should be noted that because the CSI-RS information that UE is received in subframe 6 (FDD modes) or 8 (TDD modes) comes from multiple via nodes, therefore the broadband CQI that UE is calculated, without in all senses, base station can not be utilized to it.
It is preferred that, in subframe 6 (FDD modes) or 8 (TDD modes), at the corresponding resource locations of CSI-RS of relay station, base station does not send any information；At the resource location that a certain relay station sends CSI-RS, other relay stations do not send any information, it is to avoid the CSI-RS between relay station produces interference, it is ensured that UE carries out the accuracy of channel condition information measurement.
The sub-frame configuration schematic diagram that Fig. 8 is CSI-RS in the embodiment of the present invention five.In embodiment five, there are 8 antenna ports base station, corresponds to the CSI-RS of 4 ports, the CSI-RS of each port is mutually orthogonal.The CSI of remaining 4 port of base station is measured by CRS.In embodiment five, it is assumed that comprising 6 relay stations in current area, each relay station is equipped with 4 antenna ports.
Assuming that the CSI-RS of the current base station configuration transmission cycle is 5ms, 1 and No. 6 (FDD mode) of the base station in each radio frames, or 3 and No. 8 (TDD modes, so that subframe uplink-downlink configuration is collocation form 2 as an example) CSI-RS is sent in subframe, as shown in Fig. 8 (a) and Fig. 8 (b), subframe position is represented with the filling of left oblique line.
Base station sends cycle and relay station to the relay station quantity in the measurement demand of UE link and current area according to itself CSI-RS's, determines that relay station sends CSI-RS configuration information and indicated to relay station.The configuration information can be carried to be issued in the control information that base station is sent to relay station.
In the present embodiment five, it is assumed that relay station is used and the base station identical transmission cycle is that 5ms sends CSI-RS.The CSI-RS of different relay stations is located in same subframe and takes identical running time-frequency resource, and the CSI-RS of different relay stations is orthogonal by the way of code division multiplexing.Assuming that in current radio frames, under FDD modes, base station is sent under CSI-RS, or TDD modes in subframe 1 and 6, and base station sends CSI-RS in subframe 3 and 8.Assume that the CSI-RS of 6 relay stations in current area is sent position and configured in subframe 2 and 7 (FDD modes) by base station simultaneously, or in subframe 4 and 9 (TDD modes), as shown in Fig. 8 (a) and Fig. 8 (b), represented with the filling of right oblique line, wherein Fig. 8 (a) represents fdd mode, and chart 8 (b) shows tdd mode.Specifically collocation method is：
For each antenna port assigned code resource of each relay station, wherein, the code of the same antenna port of different relay stations is mutually orthogonal.Such as, antenna port 0 (assuming that the port numbering of 4 antenna ports of correspondence is 0-3) corresponding code of each relay station is mutually orthogonal in same cell.Mutually orthogonal code is used between different relay stations, it is ensured that receiving terminal can remove the reference signal-to-interference between different relay stations by relevant matches, and the channel condition information for obtaining each relay station to UE links is estimated.
Base station sends cycle and relay station to the relay station quantity in the measurement demand of UE link and current area according to itself CSI-RS's, determines that relay station sends CSI-RS configuration information and indicated to relay station.The configuration information can be carried to be issued in the control information that base station is sent to relay station.
The code resource that each relay station measuring reference signals can be used, can be obtained by way of base station is limited well in advance with relay station, can also be carried allocation result in the configuration information that relay station sends CSI-RS from base station to each relay station dynamically distributes.
Relay station in relay station receives the configuration information that the relay station from base station sends CSI-RS, current area sends CSI-RS in subframe 2 and 7 (FDD modes) or 4 and 9 (TDD modes) using respective code resource respectively.
In the present embodiment, base station needs additionally one special identification information of increase, and the CSI-RS for telling which subframe of UE is that relay station is sent.The identification information can be handed down to UE by control information.Such as in the present embodiment, base station indicates to need to carry out relay station in subframe 2 and 7 (FDD modes) or 4 and 9 (TDD modes) in each radio frames to the channel measurement of UE links by Downlink Control Information to LTE-A UE.
In the present embodiment five, the CSI-RS that the CSI-RS that relay station is sent is sent with base station can use identical pattern, can also be different.The CSI-RS of relay station 4 ports of pattern correspondence, the CSI-RS of same relay station different antennae port is mutually orthogonal with reference to time-multiplexed mode by frequency division multiplexing or time division multiplexing or frequency division multiplexing；The CSI-RS of different relay stations is mutually orthogonal by way of code division multiplexing.
It is preferred that, in subframe 2 and 7 (FDD modes), or subframe 4 and 9 (TDD modes), at the corresponding resource locations of CSI-RS of relay station, base station does not send any information, it is to avoid the interference to the CSI-RS of relay station, it is ensured that the accuracy of UE channel measurements.
The scheme provided by the present invention, there is provided the scheme that relay station sends measuring reference signals in the lte-a system comprising the relay station without independent PCID, it is achieved thereby that measurements of the UE to the relay station without independent PCID to UE link channel conditions.Measuring reference signals of the present invention by being further ensured that relay station reduce for the transparent of UE and introduce the influence that relay station is designed for UE.From the various embodiments described above it can be seen that, in the lte-a system comprising the relay station without independent PCID, using the solution of the present invention, the collision problem of measuring reference signals between the relay station without independent PCID in base station and same cell is avoided, the measurement of channel condition information between relay station and UE without independent PCID is realized.
The above, only presently preferred embodiments of the present invention is not intended to limit the scope of the present invention, any modification, equivalent and improvement for being made within the spirit and principles of the invention etc. should be included within the scope of the present invention.
Claims (18)
1. a kind of method for sending measuring reference signals, it is characterised in that this method includes：
Base station sets relay station to send the configuration information of measuring reference signals and be handed down to relay station；Relay station generates measuring reference signals, and the measuring reference signals generated are sent according to the configuration information of the transmission measuring reference signals received；
Base station of the base station in current area and each relay station send the transmission cycle of measuring reference signals, and the transmission cycle of the measuring reference signals in current area is indicated to user equipment；Wherein,
Base station sends the transmission cycle of measuring reference signals and each relay station send measuring reference signals the transmission cycle be measuring reference signals in the current area indicated to user equipment the transmission cycle integral multiple.
2. according to the method described in claim 1, it is characterised in that the configuration information determines the subframe position information that measuring reference signals are sent for relay station, and the measuring reference signals of the relay station and the measuring reference signals of base station are sent in the way of the time-division；The time division way is：Relay station and base station send measuring reference signals in different subframes respectively.
3. method according to claim 2, it is characterised in that when the relay station is for two or more and in same cell, different relay station measuring reference signals are sent in the way of the time-division；The time division way is：Different relay stations sends the measuring reference signals in different subframes respectively.
4. method according to claim 2, it is characterised in that the base station sets the method for the configuration information that relay station sends measuring reference signals to be：The base station sends the configuration information of measuring reference signals based on the relay station number in current area, actual itself CSI-RS of measurement demand and base station transmission cycle and subframe position, configuration relay station.
5. method according to claim 2, it is characterised in that when the relay station periodically sends the measuring reference signals, the configuration information includes relay station and sends the starting subframe position of measuring reference signals, sends the cycle；Or, the configuration information is the specific subframe numbers that relay station sends measuring reference signals；
When the relay station aperiodicity sends the measuring reference signals, the configuration information is the specific subframe numbers that relay station sends measuring reference signals；Or, the configuration information is that the subframe position for sending measuring reference signals is obtained according to preparatory condition, and the preparatory condition is：Relay station is sent in base station postponed on CSI-RS position preset number subframe position transmission measuring reference signals.
6. method according to claim 5, it is characterised in that
When the measuring reference signals of different relay stations in same cell are located in same subframe and are sent using frequency division multiplexing mode, the configuration information further includes the configured information for sending band information or transmission band information of each relay station measuring reference signals, and the configured information is used for the band information that each relay station obtains transmission measuring reference signals；
Or, when the measuring reference signals of different relay stations in same cell are located in same subframe and are sent using code division multiplexing mode, code information or the configured information of code information that the configuration information is further used comprising each relay station measuring reference signals, the configured information are used for each relay station and obtain the code information that measuring reference signals are used.
7. the method according to claim 2 or 5 or 6, it is characterised in that in the control information that the configuration information is sent included in the base station to relay station.
8. according to the method in claim 2 or 3, it is characterised in that the measuring reference signals of the relay station and the CSI-RS of base station in same cell where it have identical pattern and identical sequence；Or, when the antenna port number of the relay station is different from the corresponding antenna port numbers of CSI-RS of the base station, the measuring reference signals of the relay station and the CSI-RS of base station in same cell have the pattern differed；
When the corresponding antenna port numbers of the CSI-RS that the antenna port number of the relay station is different from the base station, this method also includes：The base station is sent for indicating that relay station sends the identification information of the subframe position of measuring reference signals by downlink signaling to user equipment.
9. method according to claim 5, it is characterised in that the method for the transmission measuring reference signals is：
When the configuration information includes sending the starting subframe position of measuring reference signals, transmission cycle, since the relay station periodically send the measuring reference signals originating subframe position；
When the configuration information is the specific subframe numbers that relay station sends measuring reference signals, or the configuration information of measuring reference signals is sent to obtain the subframe position of transmission measuring reference signals according to preparatory condition, the relay station sends the measuring reference signals in specified subframe.
10. method according to claim 2, it is characterised in that this method also includes：When the measuring reference signals and the CSI-RS of base station in same cell where it of the relay station have identical pattern and identical sequence, the base station indicates the transmission cycle of measuring reference signals in current area to user equipment (UE).
11. according to the method in claim 2 or 3, it is characterised in that the relay station indicated in the configuration information is sent at the resource location of measuring reference signals, and the base station does not send any information；At the resource location that the relay station sends measuring reference signals, other relay stations in affiliated same cell do not send any information.
12. a kind of method that base station issues configuration information, it is characterised in that this method includes：
Based on the relay station number in current area, actual measurement demand and itself CSI-RS transmission cycle and subframe position, configuration relay station sends the configuration information of measuring reference signals；
The configuration information that the relay station configured is sent into measuring reference signals is carried to be issued to relay station in the control information；
Base station and each relay station in current area send the transmission cycle of measuring reference signals, and the transmission cycle of the measuring reference signals in current area is indicated to user equipment；Wherein, base station send the transmission cycle of measuring reference signals and each relay station send measuring reference signals the transmission cycle be measuring reference signals in the current area indicated to user equipment the transmission cycle integral multiple.
13. a kind of method that relay station sends measuring reference signals, it is characterised in that this method includes：
Measuring reference signals are generated, the configuration information of measuring reference signals is sent according to the relay station from base station, the subframe position that measuring reference signals are sent is determined；
The measuring reference signals of generation are sent in the subframe position that the measuring reference signals determined are sent, the transmission cycle of measuring reference signals of the user equipment in current area is carried out the measurement of channel condition information using the measuring reference signals and is fed back；
The transmission cycle of measuring reference signals in the current area is the transmission cycle instruction user equipment for sending measuring reference signals with each relay station by base station of the base station in current area；Wherein, base station send the transmission cycle of measuring reference signals and each relay station send measuring reference signals the transmission cycle be measuring reference signals in the current area indicated to user equipment the transmission cycle integral multiple.
14. a kind of system for sending measuring reference signals, it is characterised in that the system at least includes：Base station and one or more relay stations；
Wherein, base station, for setting relay station to send the configuration information of measuring reference signals, and is handed down to relay station；The base station being additionally operable in current area and each relay station send the transmission cycle of measuring reference signals, and the transmission cycle of the measuring reference signals in current area is indicated to user equipment；
Relay station, measuring reference signals are sent for the configuration information according to the transmission measuring reference signals received；
The configuration information determines the subframe position information that measuring reference signals are sent for relay station, and the measuring reference signals of the relay station and the measuring reference signals of base station are sent in the way of the time-division；The time division way is：Relay station and base station send measuring reference signals in different subframes respectively；Wherein,
Base station sends the transmission cycle of measuring reference signals and each relay station send measuring reference signals the transmission cycle be measuring reference signals in the current area indicated to user equipment the transmission cycle integral multiple.
15. system according to claim 14, it is characterised in that the base station at least includes configuration information generation unit and configuration information transmitting element, wherein,
Configuration information generation unit, for based on the relay station number in current area, actual measurement demand and itself CSI-RS transmission cycle and subframe position, configuration relay station to send the configuration information of measuring reference signals；
Configuration information transmitting element, the configuration information carrying for the relay station configured to be sent to measuring reference signals is issued to relay station in the control information.
16. system according to claim 14, it is characterised in that the relay station at least includes reference signal generation unit and reference signal transmitting element, wherein,
Reference signal generation unit, for generating measuring reference signals, the configuration information of measuring reference signals is sent according to the relay station from the configuration information transmitting element, determines the subframe position that measuring reference signals are sent；
The measuring reference signals of reference signal generation unit generation are sent in reference signal transmitting element, the subframe position that the measuring reference signals for being determined in reference signal generation unit are sent.
17. a kind of base station, it is characterised in that at least including configuration information generation unit and configuration information transmitting element, wherein,
Configuration information generation unit, for based on the relay station number in current area, actual measurement demand and itself CSI-RS transmission cycle and subframe position, configuration relay station to send the configuration information of measuring reference signals；
Configuration information transmitting element, the configuration information carrying for the relay station configured to be sent to measuring reference signals is issued to relay station in the control information；The base station being additionally operable in current area and each relay station send the transmission cycle of measuring reference signals, and the transmission cycle of the measuring reference signals in current area is indicated to user equipment；Wherein,
Base station sends the transmission cycle of measuring reference signals and each relay station send measuring reference signals the transmission cycle be measuring reference signals in the current area indicated to user equipment the transmission cycle integral multiple.
18. a kind of relay station, it is characterised in that at least including reference signal generation unit and reference signal transmitting element, wherein,
Reference signal generation unit, for generating measuring reference signals, the configuration information of measuring reference signals is sent according to the relay station from base station, determines the subframe position that measuring reference signals are sent；
Reference signal transmitting element, the measuring reference signals of reference signal generation unit generation are sent in the subframe position sent for the measuring reference signals determined in reference signal generation unit, the transmission cycle of measuring reference signals of the user equipment in current area is carried out the measurement of channel condition information using the measuring reference signals and is fed back；
The transmission cycle of measuring reference signals in the current area is the transmission cycle instruction user equipment for sending measuring reference signals with each relay station by base station of the base station in current area；Wherein,
Base station sends the transmission cycle of measuring reference signals and each relay station send measuring reference signals the transmission cycle be measuring reference signals in the current area indicated to user equipment the transmission cycle integral multiple.
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| CN200910083293.3A CN101877865B (en) | 2009-04-30 | 2009-04-30 | Method and system for sending measurement reference signal, base station and relay station |
| PCT/CN2010/071317 WO2010124544A1 (en) | 2009-04-30 | 2010-03-25 | Method, syestem, base station and relay station for transmitting a measurement reference signal |
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| WO2019157737A1 (en) | 2018-02-14 | 2019-08-22 | 华为技术有限公司 | Method and device for transmitting reference signal |
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| KR100961745B1 (en) * | 2006-11-27 | 2010-06-07 | 삼성전자주식회사 | Apparatus and method for communicating channel information in relay wireless communication system |
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| CN101124751A (en) * | 2005-02-18 | 2008-02-13 | 松下电器产业株式会社 | Wireless communication method, relay station apparatus, and wireless transmitting apparatus |
| CN101174873A (en) * | 2006-10-30 | 2008-05-07 | 华为技术有限公司 | Relay station equipment and communication forwarding method |
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