CN102036301A - Method and device for transmitting downlink demodulation reference signals of relay link and relay system - Google Patents

Abstract

The invention discloses a method and device for transmitting downlink demodulation reference signals of a relay link and a relay system. The method is used for mapping the demodulation reference signals to a time-frequency two-dimensional resource, wherein the demodulation reference signals are non-precoding reference signals and used for carrying out coherent demodulation to the downlink data transmission of the relay link. The invention solves the problem on the transmission of the demodulation reference signals of the relay link, ensures the reliability of the data transmission of the relay link, has no influence on a terminal in the same cell, and simultaneously reduces the expenses of the demodulation reference signals and the complexity of design.

Description

The transmission method of the descending demodulated reference signal of repeated link, device and relay system

Technical field

The present invention relates to wireless communication field, in particular to the descending demodulated reference signal of a kind of repeated link transmission method, device and the relay system of (Demodulation Reference Signal is called for short DMRS).

Background technology

At present, the demand for development of mobile communication is to support higher transmission rate, more perfect signal to cover and higher resource utilization.In order to reach the requirement of high transfer rate, next generation mobile communication system will adopt higher frequency bandwidth for transmission signal, and higher frequency bandwidth will be brought bigger path loss simultaneously, influences the network coverage.Relaying (Relay) technology not only can increase covering and balance and increase cell throughout, and, via node (Relay Node, be called for short RN) than the base station, has the less deployment cost that compares, therefore, relaying technique is regarded as 3GPP (the 3rd Generation Partnership Project, be called for short 3GPP) Long Term Evolution (Long Term Evolution, abbreviation LTE) key technology in evolution technology-senior Long Term Evolution (LTE-Advanced is called for short LTE-A) system.

The LTE/LTE-A system is the basis with OFDM (Orthogonal FrequencyDivision Multiplexing abbreviates OFDM as) technology.In ofdm system, when the communication resource is-form of bidimensional frequently.For example, in the LTE system, the communication resource all is to be that unit divides with frame (frame) on time orientation, and each radio frames (radioframe) length is 10ms, the subframe (sub-frame) that to comprise 10 length be 1ms, as shown in Figure 1.According to the difference of Cyclic Prefix (Cyclic Prefix abbreviates CP as) length, each subframe can comprise 12 or 14 OFDM symbols.In frequency direction, resource is that unit divides with subcarrier (sub-carrier), specifically in communication, the least unit of resource allocation is Resource Block (Resource Block, abbreviate RB as), a Physical Resource Block (Physical RB abbreviates PRB as) of corresponding physical resource.A PRB comprises 12 subcarriers at frequency domain.The resource of a corresponding subcarrier is called resource element (Resource Element is called for short RE) on each OFDM symbol.

Introduce after the relay station, be equivalent to the transmission of data many a jumping, with the double bounce system is example, the communication pattern of base station-terminal has originally become the communication pattern of base station-relay station-terminal, wherein base station-relay station link is called as repeated link (backhaul link), relay station-terminal links is called as access link (access link), and base station-terminal links is called as the link that direct transfers (direct link).In multihop system, a part of terminal is linked under the relay station, finishes communication service by relay station.Introduce after the relay station; need the backwards compatibility of assurance for terminal; the terminal of version is (such as LTE Release-8 before promptly guaranteeing; be called for short Rel-8) also can be linked under the relay station; at this time just need under the prerequisite that does not influence the communication of relay station subordinate terminal, mark off a part of resource to guarantee the communication between base station and the relay station.

With the LTE-A system is example, definite base station-relay station communication and relay station-terminal communication are carried out with time division way in the LTE-A system at present, concrete, in descending sub frame, marking off a part and be used for base station-relay station communication, these subframes are called as relaying (Relay) subframe.Rel-8 terminal for the relay station subordinate, the Relay subframe is indicated as MBSFN (Multicast Broadcast Single Frequency Network, Multicast Broadcast Single Frequency Network, abbreviate MBSFN as) subframe, thereby the Rel-8 terminal can be skipped these subframes, when finishing base station-relay station communication, guaranteed backwards compatibility for the Rel-8 terminal.In the LTE-A system, the structure of Relay subframe as shown in Figure 2.

In the Relay subframe, RN sends control information to subordinate terminal in preceding 1 or 2 OFDM symbol, afterwards through the change-over time interval of transmit status of associating to the switching of accepting state, receive repeated link downlink data information from the base station, and then through the conversion interval of accepting state to the switching of transmit status of associating.To only be concerned about among the present invention that the base station is to the efficient resource of relay station transmission in the Relay subframe.In the Relay subframe, to comprise that the base station arrives the Traffic Channel of relay station (Relay-Physical Downlink Shared Channel, abbreviation R-PDSCH), control channel (Relay-Physical Downlink Control Channel, be called for short R-PDCCH) and possible broadcast channel (Relay-Physical BroadcastChannel is called for short R-PBCH) etc.The reliable transmission of above-mentioned channel all will be based on the support of corresponding demodulated reference signal.

In the LTE-A system, consider the characteristics of the channel and the resource structures of repeated link downlink transfer, the sending method of corresponding D MRS will be different from the link that direct transfers.The descending control data of repeated link, such as relaying Physical Downlink Control Channel (R-PDCCH) etc., and the data in the repeated link Physical Broadcast Channel (R-PBCH), may sub-district specific (cell-specific) for relay station, can't carry out the precoding transmission, the precoding DMRS that discusses among the LTE-A will not be suitable for the demodulation of these channels so now.

Simultaneously, because the expense of the public reference signal of LTE system (cell-specific referencesignal is called for short CRS) is bigger, and efficient is lower, therefore can support to use MBSFN subframe transmission unicast service in the LTE-A system.Because there is not CRS in the multicast domain of MBSFN subframe, if the base station uses the MBSFN subframe to transmit data to relay station, under present technology, relay station will not have operable reference signal to carry out data demodulates so.

On the other hand, in the LTE-A system, the antenna port number of base station may reach 8.When adopting the transmit diversity mode to transmit data, diversity gain can't have clear improvement along with the increase of diversity order, but because diversity order is corresponding with the corresponding reference signal port, be that the diversity order increase can cause the port number of corresponding D MRS to increase, also will cause the expense of reference signal and the complexity of design to increase.This also is the problem that needs solve at repeated link.Simultaneously, under the transmit diversity transmission mode, receiving terminal need be known the emission port number of demodulated reference signal, to determine that the corresponding reference signal pattern carries out data demodulates.

Improve reliability of data transmission than the diversity transmission, multiplexing transmission then can improve power system capacity.Under the space division multiplexing transmission mode, be the equal of the data of a plurality of layers of multiplexing transmission (layer) on identical running time-frequency resource, a plurality of layers data were carried out the processing of precoding before mapping.Concrete multiplexing number of layers is determined according to the order (rank) of multiple-input and multiple-output (Multi-InputMulti-Output abbreviates MIMO as) channel.

In the discussion of 3GPP LTE-A correlation technique, the discussion of descending DMRS of repeated link and associated problem does not also launch, and does not propose effective solution as yet at present.

Summary of the invention

Do not have in the relevant discussion at 3GPP LTE-A the descending demodulated reference signal of repeated link processing scheme problem and the present invention is proposed, for this reason, main purpose of the present invention is to provide the transmission plan of the descending demodulated reference signal of a kind of repeated link, to address the above problem.

To achieve these goals, according to an aspect of the present invention, provide the transmission method of the descending demodulated reference signal of a kind of repeated link.

Transmission method according to the descending demodulated reference signal of repeated link of the present invention comprises: when demodulated reference signal is mapped in-and frequently on the two-dimentional resource, wherein, demodulated reference signal is non-precoding reference signal, is used for the coherent demodulation of repeated link downlink data transmission.

Preferably, the repeated link downlink data comprise following one of at least: the data of the descending control data of repeated link, repeated link Physical Broadcast Channel and the data of repeated link Physical Downlink Shared Channel, wherein, the descending control data of repeated link comprise following one of at least: the data of repeated link Physical Downlink Control Channel, the descending control format indication information of repeated link, repeated link down mixing self-retransmission indication information.

Preferably, the time-two-dimentional resource comprises the Physical Resource Block that transmitting downlink data is distributed in frequency direction frequently.

Preferably, the time-two-dimentional resource is carried the OFDM symbol of repeated link downlink data in time orientation comprises a downlink relay sub-frame frequently.

Wherein, adjust the sub-carrier positions that demodulated reference signal shines upon according to Physical Cell Identifier number in Physical Resource Block.

Wherein, the OFDM character position of demodulated reference signal mapping is fixing in Physical Resource Block.

Wherein, adjust the OFDM character position of demodulated reference signal mapping according to system bandwidth, perhaps the difference of the OFDM symbol that takies according to the repeated link downlink data is adjusted the OFDM character position of demodulated reference signal mapping.

Preferably, the layer of the port of demodulated reference signal and repeated link downlink data transmission or repeated link downlink data transmission is related corresponding.

Preferably, under the transmit diversity transmission mode, demodulated reference signal is corresponding with the port association of repeated link downlink data transmission, wherein, when relaying link downlink data when the port of a plurality of repeated link downlink data transmission transmits, related mutually orthogonal corresponding to the demodulated reference signal of different repeated link downlink data transmission ports.

Preferably, under the space division multiplexing transmission mode, the demodulated reference signal pattern is related corresponding with the number of layers of repeated link downlink data transmission, and is when carrying out the multilayer transmission, related mutually orthogonal corresponding to the demodulated reference signal of each layer.

Wherein, orthogonal manner comprise following one of at least: time division multiplexing TDM, frequency division multiplex FDM, code division multiplex CDM.

To achieve these goals, according to another aspect of the present invention, provide a kind of processing method of repeated link downlink data.

Processing method according to repeated link downlink data of the present invention comprises: the port number of setting repeated link downlink data transmission under the diversity mode, when antenna for base station port number during greater than N, the port number of repeated link downlink data transmission is set at N, and N is smaller or equal to 4.

Wherein, the mode of setting is: N transfer of data of carrying out under the diversity transmission mode in the antenna port used in the base station; Perhaps the virtual-antenna port technique is adopted in the base station, and data transmission port is mapped as N.

2,4, the port number of public reference signal CRS in the current subframe wherein, the number of the port of repeated link downlink data transmission comprises one of following:.

To achieve these goals, according to a further aspect of the invention, provide a kind of indicating means of demodulated reference signal port number.

Indicating means according to demodulated reference signal port number of the present invention comprises: the base station is to the port number of the descending demodulated reference signal of relay station indication repeated link, and indicating means is indirect indicating means and/or direct indicating means.

Wherein, indirectly indicating means comprises one of following: the port number of demodulated reference signal and first mapping relations between the antenna for base station port number are set up in the base station, and according to the port number of first mapping relations indication demodulated reference signal; The port number of demodulated reference signal is indicated in the base station to relay station by the CRC mask of repeated link Physical Broadcast Channel; Second mapping relations between the port number of the port number of demodulated reference signal and base station public reference signal are set up in the base station, and according to the port number of second mapping relations indication demodulated reference signal.

Further, first mapping relations of the port number and the antenna for base station port number of demodulated reference signal are set up in the base station, it is one of following that first mapping relations comprise: when the antenna for base station port number is 1, the port number of demodulated reference signal is 1, when the antenna for base station port number more than or equal to 2 the time, the port number of demodulated reference signal is 2; Perhaps when the antenna for base station port number was 1 or 2, the port number of demodulated reference signal was 1 or 2, when the antenna for base station port number more than or equal to 4 the time, the port number of demodulated reference signal is 4.

Preferably, the base station is set up after second mapping relations between the port number of the port number of demodulated reference signal and base station public reference signal, method also comprises: relay station obtains base station public reference signal port number by the CRC mask of base station physical broadcast channel, is obtained the port number of demodulated reference signal by second mapping relations; Mapping relations are that the port number of demodulated reference signal equals base station public reference signal port number.

Wherein, directly indicating means comprises: the port number of descending demodulated reference signal is indicated by the indicating bit in the repeated link descending control signaling.

To achieve these goals, according to a further aspect of the invention, provide a kind of base station.

Base station according to the present invention comprises: memory module, and being used to store will be from the demodulated reference signal pattern of base station transmits; Relating module is used for the demodulated reference signal pattern of storing according to the port number or the related corresponding memory module of number of layers of transfer of data; Mapping block is used for the demodulated reference signal pattern that obtains according to relating module and demodulated reference signal is mapped in when corresponding-the two-dimentional resource of frequency; Sending module is used to transmit corresponding demodulated reference signal, and wherein, demodulated reference signal is non-precoding reference signal, is used for the repeated link downlink data is carried out coherent demodulation.

Preferably, relating module comprises the adjustment submodule, is used for adjusting the demodulated reference signal pattern at time orientation and/or frequency direction.

Further, adjust submodule and also comprise, first adjusts submodule, is used for adjusting according to system bandwidth the OFDM character position of demodulated reference signal mapping; Perhaps the difference of the OFDM symbol that takies according to the repeated link downlink data is adjusted the OFDM character position of demodulated reference signal mapping; Second adjusts submodule, is used for number adjusting the sub-carrier positions that demodulated reference signal shines upon at Physical Resource Block according to Physical Cell Identifier.

Preferably, the base station also comprises processing module, is used to set the port number of repeated link downlink data transmission under the diversity mode, when antenna for base station port number during greater than N, the port number of repeated link downlink data transmission is set at N, and N is smaller or equal to 4.

Wherein, processing module is determined N the port as the repeated link downlink data transmission in the antenna port of base station; The mode that perhaps adopts virtual port is mapped as N with the port number of repeated link downlink data transmission.

Preferably, the base station also comprises the indication information generation module, be used to generate the descending indication information of repeated link, the descending indication information of repeated link is used for the base station to port number or the number of layers of relay station indication association corresponding to the repeated link downlink data transmission of demodulated reference signal.

Wherein, the indication information generation module is indicated one of in the following manner: the descending indication information of repeated link is the CRC mask of repeated link Physical Broadcast Channel, and the port number of demodulated reference signal is indicated by the CRC mask of repeated link Physical Broadcast Channel; The descending indication information of repeated link is the indication information of antenna for base station port number, the port number of demodulated reference signal and first mapping relations between the antenna for base station port number are set up in the base station, and indicate the port number of demodulated reference signal according to first mapping relations; Indication information is the indication information of base station public reference signal port number, the port number of demodulated reference signal and second mapping relations between the public reference signal port number of base station are set up in the base station, and indicate the port number of demodulated reference signal according to second mapping relations.

To achieve these goals, according to a further aspect of the invention, provide a kind of relaying to stand and accounted for.

Relay station according to the present invention comprises: receiver module, be used to receive the descending demodulated reference signal of repeated link, and the descending demodulated reference signal of repeated link is non-precoding reference signal, is used for the coherent demodulation of repeated link downlink data transmission.

Preferably, relay station also comprises the indication information receiver module, be used to receive the descending indication information of repeated link that the indication information generation module generates, the descending indication information of repeated link is used for relay station and determines port number or the number of layers of association corresponding to the repeated link downlink data transmission of demodulated reference signal.

To achieve these goals, according to a further aspect of the invention, provide a kind of relay system.

Relay system according to the present invention comprises: base station and relay station, wherein,

The base station comprises: memory module, and being used to store will be from the demodulated reference signal pattern of base station transmits; Relating module is used for the demodulated reference signal pattern of storing according to the port number or the related corresponding memory module of number of layers of transfer of data; Mapping block is used for the demodulated reference signal pattern that obtains according to relating module and demodulated reference signal is mapped in when corresponding-the two-dimentional resource of frequency; Sending module is used to transmit corresponding demodulated reference signal, and wherein, demodulated reference signal is non-precoding reference signal, is used for the repeated link downlink data is carried out coherent demodulation;

Relay station comprises: receiver module, be used to receive the descending demodulated reference signal of repeated link, and the descending demodulated reference signal of repeated link is non-precoding reference signal, is used for the coherent demodulation of repeated link downlink data transmission.

By the present invention, when DMRS is mapped in-form the DMRS pattern on the bidimensional resource frequently, comprised the indication operation of DMRS port simultaneously, solved the transmission problem of the descending demodulated reference signal of repeated link, guaranteed the reliability of repeated link downlink data transmission, and can the terminal in the same sub-district not exerted an influence.Simultaneously, when diversity is transmitted, adopt data mapping method, promptly set the port number of diversity transmission, under the prerequisite that guarantees the diversity transmission gain, reduced the expense of demodulated reference signal and the complexity of design.

Description of drawings

Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:

Fig. 1 is according to frame structure schematic diagram in the LTE/LTE-A system of correlation technique;

Fig. 2 is the Relay subframe structure schematic diagram according to correlation technique;

Fig. 3 is the optimization flow chart according to the DMRS transmission method of the embodiment of the invention;

Fig. 4 is the DMRS pattern schematic diagram of example 1 of the present invention;

Fig. 5 is the DMRS pattern schematic diagram of example 1 of the present invention;

Fig. 6 is the DMRS pattern schematic diagram of example 1 of the present invention;

Fig. 7 is the DMRS pattern schematic diagram of example 2 of the present invention;

Fig. 8 is the DMRS pattern schematic diagram of example 2 of the present invention;

Fig. 9 is the DMRS pattern schematic diagram of example 2 of the present invention;

Figure 10 is the DMRS pattern schematic diagram of example 3 of the present invention;

Figure 11 is the DMRS pattern schematic diagram of example 3 of the present invention;

Figure 12 is the DMRS pattern schematic diagram of example 4 of the present invention;

Figure 13 is the DMRS pattern schematic diagram of example 5 of the present invention;

Figure 14 is the DMRS pattern schematic diagram of example 6 of the present invention;

Figure 15 is the DMRS pattern schematic diagram of example 7 of the present invention;

Figure 16 is the DMRS pattern schematic diagram of example 7 of the present invention;

Figure 17 is the structured flowchart according to the base station of the embodiment of the invention;

Figure 18 is the preferred structure block diagram according to the base station of the embodiment of the invention;

Figure 19 is the structured flowchart according to the relay station of the embodiment of the invention;

Figure 20 is the structured flowchart according to the relay system of the embodiment of the invention.

Embodiment

Functional overview

The embodiment of the invention provides the design of the descending DMRS of a kind of repeated link, when DMRS is mapped in-frequently on the two-dimentional resource, the DMRS port is indicated, solved the transmission problem of the descending DMRS of repeated link, guaranteed the reliability of repeated link downlink data transmission, and can the terminal in the same sub-district not exerted an influence.The transmission method of repeated link downlink data is set the port number that diversity is transmitted when providing a kind of diversity to transmit simultaneously, under the prerequisite that guarantees the diversity transmission gain, has reduced the expense of demodulated reference signal and the complexity of design.

Method embodiment

According to embodiments of the invention, the transmission method of the descending demodulated reference signal of a kind of repeated link is provided, this method comprises when DMRS is mapped in-the two-dimentional resource of frequency on, wherein, demodulated reference signal is non-precoding (non-precoded) reference signal, is used for the coherent demodulation of repeated link downlink data transmission.

The repeated link downlink data comprise following one of at least: the data of the descending control data of repeated link, repeated link Physical Broadcast Channel and the data of repeated link Physical Downlink Shared Channel.And the descending control data of repeated link comprise following one of at least: descending control format indication information of the data of repeated link Physical Downlink Control Channel or repeated link or repeated link down mixing self-retransmission indication information etc.The repeated link downlink service data is included in the data of transmitting in the repeated link downlink physical shared channel, and its transmission mode can be transmit diversity or space division multiplexing.

The mapping position of DMRS comprises the Physical Resource Block that transmitting downlink data is distributed in frequency direction; The OFDM symbol of the mapping position of DMRS bearing downlink data in time orientation comprises a downlink relay sub-frame.Be that the DMRS that describes among the present invention only is arranged in scheduled resources.For example, if this DMRS is used for the data demodulates of repeated link Physical Broadcast Channel, this DMRS only can be mapped in the shared resource of R-PBCH transmission, for example among some specific PRB so; If this DMRS is used for the demodulation of repeated link control data, such as R-PDCCH, R-PCFICH, R-PHICH etc., this DMRS only can be mapped in the descending control domain of repeated link so, such as being part of O FDM symbol among some PRB or the PRB; If this DMRS is used for the coherent demodulation of repeated link downlink service data transmission, this DMRS only can be mapped in the shared resource of respective data transfer so.

Preferably, the OFDM symbol of DMRS mapping does not comprise the OFDM symbol that is mapped with public reference signal.

Fig. 3 is the optimization flow chart according to the DMRS processing method of the embodiment of the invention; As shown in Figure 3, this method comprises that following step S302 is to step S306:

Step S302, DMRS is related corresponding with the port or the layer of repeated link downlink data transmission.

Under the transmission mode of transmit diversity, the DMRS that the present invention describes is corresponding with the antenna port of respective data transfer, and the DMRS of each port is mutually orthogonal.The antenna port here is meant the antenna port number that receiving terminal can be seen when receiving data, promptly under the situation that does not adopt the virtual-antenna technology, the antenna port number is exactly actual antenna port number, under the situation that adopts the virtual-antenna technology, the antenna port number is virtual antenna port number afterwards.Under the transmission mode of space division multiplexing, the DMRS that the present invention describes is corresponding with the layer of respective data transfer, and the DMRS of each layer is mutually orthogonal.And in this case, when transfer of data is carried out in the base station, need the index of corresponding precoding codebook of indication or precoding codebook.The orthogonal manner of the DMRS of the multiport/multilayer of the present invention statement can be one or several the combination among FDM, TDM, the CDM.

Step S304 adjusts the DMRS pattern at time orientation and/or frequency direction.

The pattern of the demodulated reference signal DMRS that the present invention describes can be fixed, and also can adjust flexibly.Adjustment comprises the adjustment of time orientation and the adjustment of frequency direction.The adjustment of time orientation refers to change the OFDM character position of DMRS mapping.For example in the LTE system, the symbolic number that takies greater than 10 RB PDCCH with smaller or equal to 10 RB the time when descending system bandwidth may be different, and this will cause the original position difference of the OFDM symbol of repeated link downlink transfer in both cases.At this moment, can design the pattern of a kind of DMRS at different situations, with the situation of compatible different system bandwidth, perhaps at the pattern of the different DMRS of different system bandwidth situation design, guaranteeing all has a good channel estimation performance under different situations.The adjustment of time orientation also can be to take OFDM symbol difference at transfer of data to adjust.For example, if DMRS is used for the data demodulates of R-PDCCH, because the OFDM symbolic number that the control channel content change causes R-PDCCH to take may also can change.At this moment, can design the pattern of a kind of DMRS, perhaps adjust DMRS mapped symbol position flexibly at different situations at the situation of all permissions.The adjustment of frequency direction refers to change the sub-carrier positions that DMRS shines upon in a RB.For example, the fixing mapping sub-carrier positions of DMRS in RB, also can utilize Physical Cell Identifier number (Physical Cell ID like that by similar LTECRS, abbreviation PCID) determines the mapping sub-carrier positions of DMRS in RB, when neighbor cell also transmits this DMRS in this RB, can avoid the phase mutual interference of DMRS like this.

Should be noted that step S304 is an optional step, when the DMRS pattern of the present invention's description is not adjusted, then do not need this step.

Step S306, when DMRS is mapped in/frequently on the two-dimentional resource.

Consider the factors such as complexity of DMRS expense and design, the invention provides a kind of processing method of repeated link downlink data.This method comprises: set the number of the port of described repeated link downlink data transmission under the diversity mode, when antenna for base station port number during greater than N, the port number of described repeated link downlink data transmission is set at N, N is smaller or equal to 4.Be that N transfer of data of carrying out under the diversity transmission mode in the antenna port used in the base station; Perhaps the virtual-antenna port technique is adopted in the base station, and emission port is mapped as N.

Particularly, when the antenna for base station port number surpasses some, the port number of restriction diversity transmission, the expense that guarantees DMRS guarantees the flexibility of DMRS design in reasonable range.The restriction here can be that a definite part is carried out transfer of data in the antenna port of base station, or uses the virtual port technology, by the mode at different antennae port mapping identical data and DMRS, reaches the purpose of restriction diversity transmit port number.

The present invention also provides a kind of indicating means of demodulated reference signal port number, is used for the port number of base station to relay station indication DMRS, has guaranteed that receiving terminal accurately obtains the transmit port number of DMRS, thereby has implemented the relevant detection algorithm.

Particularly, the port number of DMRS is indicated by the CRC mask of relaying Physical Broadcast Channel, and described CRC mask is identical with the CRC mask of LTE Physical Broadcast Channel;

Particularly, set up mapping relations between the port number of DMRS and the antenna for base station port number, by the port number of the described demodulated reference signal of the implicit indication of antenna for base station port number.And mapping relations are: when the antenna for base station port number was 1, described demodulated reference signal port number was 1, when the antenna for base station port number more than or equal to 2 the time, the port number of described demodulated reference signal is 2; Perhaps when the antenna for base station port number was 1 or 2, described demodulated reference signal port number was 1 or 2, when the antenna for base station port number more than or equal to 4 the time, the port number of described demodulated reference signal is 4;

Particularly, set up mapping relations between the port number of the port number of DMRS and base station public reference signal, concrete, relay station obtains described base station public reference signal port number by the CRC mask of base station physical broadcast channel, by the port number of the described demodulated reference signal of the implicit indication of base station public reference signal port number; Preferably, described mapping relations are that the port number of demodulated reference signal equals described base station public reference signal port number.

Perhaps, the port number of DMRS is indicated by the indicating bit in the repeated link descending control signaling.

Need to prove, can in computer system, carry out in the step shown in the flow chart of accompanying drawing such as a set of computer-executable instructions, and, though there is shown logical order in flow process, but in some cases, can carry out step shown or that describe with the order that is different from herein.

Be described in detail below in conjunction with the implementation procedure of example the embodiment of the invention.

In the LTE/LTE-A system,, be divided into common CP (NormalCP) and expansion CP (Extend CP) at the difference of CP length.Under common CP length, a subframe has 14 OFDM symbols; Under expansion CP length, a subframe has 12 OFDM symbols.Because CP length difference causes the OFDM character position of DMRS mapping to change to some extent.Below describe by specific embodiment.

Example 1:

In example 1, suppose that the DMRS that the present invention describes is used for the demodulation of R-PDCCH, and suppose that the transmission of R-PDCCH takies the part of the interior base station of relay sub-frame to the OFDM symbol of relay station transmission.Concrete, suppose that the OFDM symbolic number that the R-PDCCH transmission takies is N _R-PDCCH, N wherein _R-PDCCHCan carry out dynamic or semi-static setting by the base station according to the capacity of repeated link control channel; Also can between base station and relay station, appoint promptly static the setting.Suppose the dynamic or semi-static N of setting _R-PDCCHValue the time, the agreement

Wherein Be the R-PDCCH minimum OFDM number that can take of agreement,

The R-PDCCH maximum OFDM symbolic number that can take for agreement; Work as N _R-PDCCHValue static state when being provided with, suppose N _R-PDCCHValue be decided to be approximately $N_{R-\mathrm{PDCCH}}=N_{R-\mathrm{PDCCH}}^{\mathrm{static}}.$

The design principle of the DMRS of R-PDCCH is in this example, and in a RB, the DMRS of same port is at 6 subcarriers that are spaced apart of frequency domain.In time domain, if the dynamic or semi-static N that is provided with _R-PDCCHValue, then the OFDM symbol of DMRS mapping is for to take minimum OFDM symbolic number (promptly at R-PDCCH

) hypothesis under, first of R-PDCCH territory do not comprise CRS and last and do not comprise the OFDM symbol of CRS; If static state is provided with N _R-PDCCHValue, then DMRS is that first does not comprise CRS and last does not comprise the OFDM symbol of CRS in the OFDM symbol that takies of R-PDCCH at the OFDM symbol of time domain mapping.The prerequisite here is that the hypothesis base station uses common subframe (non-MBSFN subframe) to relay station transmission data.When the base station is used MBSFN subframe (being that the backhaul link does not have CRS) to relay station transmission data, the DMRS of R-PDCCH identical pattern when adopting and transmitting with common subframe.

For example, the port number of the descending control data diversity transmission of suppose relay link is restricted to 2.As the dynamic or semi-static N that is provided with _R-PDCCHValue the time, Hypothesis under, an example of the pattern of DMRS was as shown in Figure 4 when system bandwidth was greater than 10 RB under the common CP length.Here the primary sign of supposing R-PDCCH is the 4th an OFDM symbol.Equally, pattern shown in Figure 4 is applicable to that also static state is provided with N _R-PDCCHValue the time, when

The time the DMRS pattern.

In this example, suppose that further the sub-carrier positions that DMRS shines upon determines that according to Physical Cell Identifier the CRS mapping position of concrete grammar and LTE system determines that method is identical in RB.For DMRS pattern shown in Figure 4, the particular location that in a RB, shines upon as shown in the formula.

k＝{(v+v _shift)mod6，6+(v+v _shift)mod6}

$v_{\mathrm{shift}}=N_{\mathrm{<figure-callout\; id="6"\; label="ID\; cell\; mod"\; filenames="H2009101788641E0000011.png,H2009101788641E0000061.png"\; state="\{\{state\}\}">ID</figure-callout>}}^{\mathrm{cell}}\mathrm{mod}6$

Wherein k represents the sub-carrier positions that DMRS shines upon in a RB, and l represents the OFDM character position of DMRS mapping, p ^DMRSThe port numbering of expression DMRS, Expression Physical Cell Identifier number.

When system bandwidth during smaller or equal to 10 RB, the primary sign of supposing R-PDCCH is the 5th an OFDM symbol, and at this time the DMRS pattern is adjusted into as shown in Figure 5.The concrete mapping position of DMRS as shown in the formula.

k＝{(v+v _shift)mod6，6+(v+v _shift)mod6}

$v_{\mathrm{shift}}=N_{\mathrm{<figure-callout\; id="6"\; label="ID\; cell\; mod"\; filenames="H2009101788641E0000011.png,H2009101788641E0000061.png"\; state="\{\{state\}\}">ID</figure-callout>}}^{\mathrm{cell}}\mathrm{mod}6$

Wherein the implication of each parameter is same as described above.

Under expansion CP length, when system bandwidth during greater than 10 RB, under the DMRS of this example design principle, an example of DMRS pattern as shown in Figure 6.DMRS concrete mapping position in a RB becomes

k＝{(v+v _shift)mod6，6+(v+v _shift)mod6}

$v_{\mathrm{shift}}=N_{\mathrm{<figure-callout\; id="6"\; label="ID\; cell\; mod"\; filenames="H2009101788641E0000011.png,H2009101788641E0000061.png"\; state="\{\{state\}\}">ID</figure-callout>}}^{\mathrm{cell}}\mathrm{mod}6$

Each meaning of parameters as hereinbefore in the formula.

Under expansion CP length, when system bandwidth during smaller or equal to 10 RB, under the DMRS of this example design principle, the DMRS pattern supposes at this time that just the primary sign of R-PDCCH becomes the 5th OFDM symbol still as shown in Figure 6.The DMRS pattern during greater than 10 RB is identical with system bandwidth for the particular location that DMRS shines upon in a RB.

In this example, if the size of the REG of R-PDCCH (Resource Element Group abbreviates the resource element group as) is identical with LTE REG size, so when the R-PDCCH single port is transmitted, the R-PDCCH data are 2 to shine upon according to the DMRS port still.

Should be noted that the CRS pattern that in this routine schematic diagram, just schematically describes the LTE system, and do not represent the corresponding relation between CRS port number and the DMRS port number.And when the base station is used the MBSFN subframe to relay station transmission data, will there be CRS in the 3rd the OFDM symbol OFDM symbol afterwards.

Should be appreciated that the DMRS pattern in this example just plays description and explains purpose of the present invention, and also paired inadequately restriction of the present invention.

Example 2:

Under the hypothesis and DMRS design principle of example 1, the dynamic or semi-static configuration of OFDM symbolic number that takies as R-PDCCH, perhaps R-PDCCH take OFDM symbolic number static configuration the time, the example of another DMRS pattern is shown in Fig. 7,8,9.Still hypothesis is when the dynamic or semi-static configuration of OFDM symbolic number that R-PDCCH takies

The OFDM symbolic number static state that takies as R-PDCCH is provided with N _R-PDCCHValue the time

Fig. 7 is the DMRS pattern example of system bandwidth during greater than 10 RB, in a RB concrete mapping resource location as shown in the formula.

k＝{(v+v _shift)mod6，6+(v+v _shift)mod6}

$v_{\mathrm{shift}}=N_{\mathrm{<figure-callout\; id="6"\; label="ID\; cell\; mod"\; filenames="H2009101788641E0000011.png,H2009101788641E0000061.png"\; state="\{\{state\}\}">ID</figure-callout>}}^{\mathrm{cell}}\mathrm{mod}6$

Wherein the implication of each parameter is identical with example 1.

Fig. 8 is illustrated in the DMRS pattern example of system bandwidth during smaller or equal to 10 RB, in a RB concrete mapping resource location as shown in the formula.

k＝{(v+v _shift)mod6，6+(v+v _shift)mod6}

$v_{\mathrm{shift}}=N_{\mathrm{<figure-callout\; id="6"\; label="ID\; cell\; mod"\; filenames="H2009101788641E0000011.png,H2009101788641E0000061.png"\; state="\{\{state\}\}">ID</figure-callout>}}^{\mathrm{cell}}\mathrm{mod}6$

Wherein the implication of each parameter as hereinbefore.

Under expansion CP length, DMRS pattern example as shown in Figure 9.System bandwidth is identical greater than the DMRS pattern of 10 RB with less than 10 RB the time, and when just system bandwidth was greater than 10 RB, the primary sign of R-PDCCH was the 4th an OFDM symbol, and the primary sign of R-PDCCH is the 5th an OFDM symbol during smaller or equal to 10 RB.

The concrete resource location that DMRS pattern example shown in Figure 9 is shone upon in a RB as shown in the formula.

k＝{(v+v _shift)mod?6，6+(v+v _shift)mod6}

$v_{\mathrm{shift}}=N_{\mathrm{<figure-callout\; id="6"\; label="ID\; cell\; mod"\; filenames="H2009101788641E0000011.png,H2009101788641E0000061.png"\; state="\{\{state\}\}">ID</figure-callout>}}^{\mathrm{cell}}\mathrm{mod}6$

Wherein each meaning of parameters as hereinbefore.

In this example, if the size of the REG of R-PDCCH is identical with LTE REG size, so when the R-PDCCH single port is transmitted, the R-PDCCH data are 2 to shine upon according to the DMRS port still.

Should be noted that the CRS pattern that in this routine schematic diagram, just schematically describes the LTE system, and do not represent the corresponding relation between CRS port number and the DMRS port number.And when the base station is used the MBSFN subframe to relay station transmission data, will there be CRS in the 3rd the OFDM symbol OFDM symbol afterwards.

Should be appreciated that the DMRS pattern in this example just plays description and explains purpose of the present invention, and also paired inadequately restriction of the present invention.

Example 3:

Under the hypothesis and DMRS design principle of example 1, the dynamic or semi-static configuration of OFDM symbolic number that takies as R-PDCCH, perhaps R-PDCCH take OFDM symbolic number static configuration the time, the invention provides the method and the pattern example of another DMRS design.

The DMRS design principle of this example is, at the pattern of system bandwidth greater than the situation design DMRS of 10 RB.When system bandwidth during smaller or equal to 10 RB, if relay station does not receive the OFDM symbol that some is mapped with DMRS, the DMRS pattern when then system bandwidth is smaller or equal to 10 RB is for removing the DMRS in the symbol that does not receive on original DM RS pattern basis.

For example, suppose static setting of OFDM symbolic number that R-PDCCH takies, promptly between base station and relay station, appoint the OFDM symbolic number that R-PDCCH takies:

And hypothesis is under common CP length, when system bandwidth during greater than 10 RB,

When system bandwidth during smaller or equal to 10 RB,

Suppose when system bandwidth during greater than 10 RB the R-PDCCH original position be the 4th OFDM symbol, system bandwidth during smaller or equal to 10 RB the R-PDCCH original position be the 5th OFDM symbol.The diversity port number of supposing R-PDCCH simultaneously is restricted to 2.Under above hypothesis, the DMRS pattern of R-PDCCH as shown in figure 10 when system bandwidth was greater than 10 RB under the common CP length.

The particular location that DMRS pattern shown in Figure 10 shines upon in a RB is as follows.

k＝{(v+v _shift)mod6，6+(v+v _shift)mod6}

$v_{\mathrm{shift}}=N_{\mathrm{<figure-callout\; id="6"\; label="ID\; cell\; mod"\; filenames="H2009101788641E0000011.png,H2009101788641E0000061.png"\; state="\{\{state\}\}">ID</figure-callout>}}^{\mathrm{cell}}\mathrm{mod}6$

Wherein k represents the sub-carrier positions that DMRS shines upon in a RB, and l represents the OFDM character position of DMRS mapping, p ^DMRSThe port numbering of expression DMRS.

The expression Physical Cell Identifier.

When system bandwidth during smaller or equal to 10 RB, the primary sign of supposing R-PDCCH is the 5th an OFDM symbol.At this time under the design principle of present embodiment, the pattern of DMRS becomes the form of Figure 11 on the basis of Figure 10, promptly no longer shines upon DMRS in the 4th OFDM symbol.

The particular location that DMRS pattern shown in Figure 11 shines upon in a RB as shown in the formula.

k＝{(v+v _shift)mod6，6+(v+v _shift)mod6}

$v_{\mathrm{shift}}=N_{\mathrm{<figure-callout\; id="6"\; label="ID\; cell\; mod"\; filenames="H2009101788641E0000011.png,H2009101788641E0000061.png"\; state="\{\{state\}\}">ID</figure-callout>}}^{\mathrm{cell}}\mathrm{mod}6$

Wherein the implication of each parameter as hereinbefore.

Should be noted that the CRS pattern that in this routine schematic diagram, just schematically describes the LTE system, and do not represent the corresponding relation between CRS port number and the DMRS port number.And when the base station is used the MBSFN subframe to relay station transmission data, will there be CRS in the 3rd the OFDM symbol OFDM symbol afterwards.

Should be appreciated that the DMRS pattern in this example just plays description and explains purpose of the present invention, and also paired inadequately restriction of the present invention.

Example 4:

In this example, suppose that the DMRS that the present invention describes is used for the demodulation of R-PDCCH, and suppose that the transmission of R-PDCCH takies the part of the interior base station of relay sub-frame to the OFDM symbol of relay station transmission.Concrete, suppose that the OFDM symbolic number that the R-PDCCH transmission takies is N _R-PDCCH, N wherein _R-PDCCHCan carry out dynamic or semi-static setting by the base station according to the capacity of repeated link control channel; Also can between base station and relay station, appoint promptly static the setting.Suppose the dynamic or semi-static N of setting _R-PDCCHValue the time, the agreement

Wherein

Be the R-PDCCH minimum OFDM number that can take of agreement,

The R-PDCCH maximum OFDM symbolic number that can take for agreement; Work as N _R-PDCCHValue static state when being provided with, suppose N _R-PDCCHValue be decided to be approximately $N_{R-\mathrm{PDCCH}}=N_{R-\mathrm{PDCCH}}^{\mathrm{static}}.$

The design principle of the DMRS of R-PDCCH is in this example, and in a RB, the DMRS of same port is at 6 subcarriers that are spaced apart of frequency domain.In time domain, all DMRS only can be mapped on the OFDM symbol, and the symbol that shines upon this DMRS is the OFDM symbol that does not comprise CRS in R-PDCCH territory, and when CP length was determined, this OFDM symbol was fixed.The prerequisite here is that the hypothesis base station uses common subframe (non-MBSFN subframe) to relay station transmission data.When the base station is used MBSFN subframe (being that the backhaul link does not have CRS) to relay station transmission data, the DMRS of R-PDCCH identical pattern when adopting and transmitting with common subframe.

For example, the port number of the descending control data diversity transmission of suppose relay link is restricted to 2.The DMRS pattern example as shown in figure 12 under the common CP length.Figure 12 is applicable to that simultaneously the downlink system bandwidth is greater than or less than the situation that equals 10 RB, is the primary sign difference of R-PDCCH mapping under two kinds of situations.

In this example, suppose that further the sub-carrier positions that DMRS shines upon determines that according to Physical Cell Identifier the CRS mapping position of concrete grammar and LTE system determines that method is identical in RB.For DMRS pattern shown in Figure 12, the particular location that in a RB, shines upon as shown in the formula.

k＝{(v+v _shift)mod6，6+(v+v _shift)mod6}

$v_{\mathrm{shift}}=N_{\mathrm{<figure-callout\; id="6"\; label="ID\; cell\; mod"\; filenames="H2009101788641E0000011.png,H2009101788641E0000061.png"\; state="\{\{state\}\}">ID</figure-callout>}}^{\mathrm{cell}}\mathrm{mod}6$

Wherein k represents the sub-carrier positions that DMRS shines upon in a RB, and l represents the OFDM character position of DMRS mapping, p ^DMRSThe port numbering of expression DMRS, Expression Physical Cell Identifier number.

Under expansion CP length, the OFDM symbol that shines upon at the DMRS of this example is the 5th an OFDM symbol, repeats no more here.

In this example, if the size of the REG of R-PDCCH (Resource Element Group abbreviates the resource element group as) is identical with LTE REG size, so when the R-PDCCH single port is transmitted, the R-PDCCH data are 2 to shine upon according to the DMRS port still.

Should be noted that the CRS pattern that in this routine schematic diagram, just schematically describes the LTE system, and do not represent the corresponding relation between CRS port number and the DMRS port number.And when the base station is used the MBSFN subframe to relay station transmission data, will there be CRS in the 3rd the OFDM symbol OFDM symbol afterwards.

Should be appreciated that the DMRS pattern in this example just plays description and explains purpose of the present invention, and also paired inadequately restriction of the present invention.

Example 5:

Under the hypothesis of example 2, this example provides a kind of DMRS method for designing when DMRS port number maximum constraints is 4.The design principle of DMRS port 0,1 is identical with example 2 in this example; Adopt the mode quadrature of CDM+FDM during 4 port transmission of DMRS, concrete, on the DMRS of 2 ports pattern basis, multiplexing 4 layers of CDM spread spectrum, wherein CDM spreads to the time domain spread spectrum.No matter the base station uses MBSFN subframe (being that the backhaul link does not have CRS) or common subframe to transmit data to relay station in this example, and the pattern of DMRS remains unchanged.

Under above hypothesis, the DMRS pattern when system bandwidth is greater than 10 RB under the common CP length as shown in figure 13.A spectrum-spreading unit when the ellipse representation CDM among the figure is multiplexing.Can use the Walsh sign indicating number as spreading code during spread spectrum, for example length is 2 Walsh sign indicating number [1,1] and [1 ,-1].Among Figure 13, DMRS port 0 is multiplexing on identical resource by the mode of CDM with 2, and port one is multiplexing on identical resource by the mode of CDM with 3.The resource mapping of DMRS in a RB is as follows.

k＝{(v+v _shift)mod6，6+(v+v _shift)mod6}

l＝{4，6}

$v_{\mathrm{shift}}=N_{\mathrm{<figure-callout\; id="6"\; label="ID\; cell\; mod"\; filenames="H2009101788641E0000011.png,H2009101788641E0000061.png"\; state="\{\{state\}\}">ID</figure-callout>}}^{\mathrm{cell}}\mathrm{mod}6$

Wherein k represents the sub-carrier positions that DMRS shines upon in a RB, and l represents the OFDM character position of DMRS mapping, p ^DMRSThe port numbering of expression DMRS,

Expression Physical Cell Identifier number.Under expansion CP length, DMRS mapping OFDM symbol is adjusted into l={6, and 7} repeats no more here.

In this example, if the size of the REG of R-PDCCH is identical with LTE REG size, so when the R-PDCCH transmit port less than 2 the time, the R-PDCCH data are 2 to shine upon according to the DMRS port still.

Should be noted that the CRS pattern that in this routine schematic diagram, just schematically describes the LTE system, and do not represent the corresponding relation between CRS port number and the DMRS port number.And when the base station is used the MBSFN subframe to relay station transmission data, will there be CRS in the 3rd the OFDM symbol OFDM symbol afterwards.

Should be appreciated that the DMRS pattern in this example just plays description and explains purpose of the present invention, and also paired inadequately restriction of the present invention.

Example 6:

In this example, suppose that the DMRS of the present invention's description is used for the coherent demodulation of repeated link downlink data transmission, described data can be the descending control datas of repeated link, the data that diversity is transmitted in the perhaps data of repeated link downlink physical broadcast channel, or the repeated link DSCH Downlink Shared Channel etc.

The DMRS design principle of this example is: port of DMRS, two ports resource overhead during with four port transmission is identical with the resource location that takies, and just the mode of employing CDM guarantees the DMRS quadrature of each port when the DMRS multiport transmit; The OFDM symbol of DMRS mapping is the OFDM symbol that does not have the CRS transmission in the common subframe (non-MBSFN subframe), and if the base station use the MBSFN subframe to transmit data to relay station, the DMRS pattern that transmits in the pattern of DMRS and the common subframe is identical.

Under above hypothesis, a pattern example of DMRS design as shown in figure 14, the frequency domain position of DMRS is subcarrier k={3,9}, time-domain position are OFDM symbol l={6,7,11,13}.Wherein the DMRS of each port is at 6 subcarriers of frequency domain interval; The resource that DMRS takies when 1,2,4 port transmission is identical, uses the mode of CDM spread spectrum to guarantee the DMRS quadrature of different port when being a plurality of port on same resource.A spectrum-spreading unit during ellipse representation CDM among the figure.Can select the Walsh sign indicating number as orthogonal code during CDM, for example [1,1] and [1 ,-1].When four port transmission of DMRS, the RE of 4 DMRS on the same subcarrier is as a spectrum-spreading unit, and when for example getting the Walsh sign indicating number as spreading code, the Walsh sign indicating number can be taken as:

$\left\{\begin{array}{c}\left[\mathrm{1,1,1,1}\right]\\ [1,-\mathrm{1,1},-1]\\ [\mathrm{1,1},-1,-1]\\ [1,-1,-\mathrm{1,1}]\end{array}\right.$

Here repeat no more.

If in order to guarantee single RB performance for estimating channel, DMRS also can be the frequency domain edge subcarrier of a RB in the mapping position of frequency domain, for example the mapping subcarrier of DMRS is k={1,12}.

If the end position of the OFDM symbol that relay station can receive in a subframe is the 14th an OFDM symbol, then the OFDM character position of DMRS mapping can be l={6,7,13, and 14}.

Should be noted that the CRS pattern that in this routine schematic diagram, just schematically describes the LTE system, and do not represent the corresponding relation between CRS port number and the DMRS port number.And when the base station is used the MBSFN subframe to relay station transmission data, will there be CRS in the 3rd the OFDM symbol OFDM symbol afterwards.

Should be appreciated that the DMRS pattern in this example just plays description and explains purpose of the present invention, and also paired inadequately restriction of the present invention.

Example 7:

In this example, suppose that the DMRS of the present invention's description is used for the coherent demodulation of repeated link downlink data transmission, described data can be the descending control datas of repeated link, the data that diversity is transmitted in the perhaps data of repeated link downlink physical broadcast channel, or the repeated link DSCH Downlink Shared Channel etc.

The DMRS design principle of this example is: the resource overhead when port of DMRS, two port transmission is identical with the resource location that takies; The mode of employing CDM guarantees the DMRS quadrature of each port during two port transmission, increases the expense of DMRS during four port transmission, adopts the mode of CDM+FDM (Frequency Division Multiplexing is called for short FDM) to guarantee each port quadrature; The OFDM symbol of DMRS mapping is the OFDM symbol that does not have the CRS transmission in the common subframe (non-MBSFN subframe), and if the base station use the MBSFN subframe to transmit data to relay station, the DMRS pattern that transmits in the pattern of DMRS and the common subframe is identical.

Under above hypothesis, a pattern example of DMRS design as shown in figure 15.One of them port resource that DMRS takies during with two port transmission is identical, just uses multiplexing two layers of mode of CDM during two ports on the same resource.A spectrum-spreading unit during ellipse representation CDM among the figure.Can select the Walsh sign indicating number as orthogonal code during CDM, for example [1,1] and [1 ,-1].When four port transmission of DMRS, port number is divided into two groups, for example { 0,1} is with { 2,3}, the DMRS of these two groups of ports use the mode of FDM to keep quadrature, and in each group, the mode of use CDM guarantees the DMRS quadrature of two ports.

The OFDM character position that DMRS pattern shown in Figure 15 takies in time domain is l={6,7,11, and 13}.If the end position of the OFDM symbol that relay station can receive in a subframe is the 14th an OFDM symbol, also the mapping symbols of DMRS can be adjusted into l={6,7,13,14}.

Under expansion CP length, two OFDM symbols of DMRS mapping become l={5, and 6,9,11}.Equally,, also the mapping symbols of DMRS can be adjusted into l={5 in a subframe if the end position of the OFDM symbol that relay station can receive is the 12nd an OFDM symbol, 6,11,12}.

Under the hypothesis of this example, also can be defined as the two ends of a RB frequency domain to DMRS in the mapping position of frequency domain, can guarantee the performance for estimating channel of single RB like this.A DMRS pattern example as shown in figure 16.Here repeat no more.

Should be noted that the DMRS pattern of describing in this example also goes for the data demodulates under the repeated link data space division multiplexing transmission mode.At this time the port number of DMRS is corresponding with the number of layers of multiplexing transmission.Here repeat no more.

Should be noted that the CRS pattern that just schematically describes the LTE system at this routine schematic diagram, and do not represent the corresponding relation between CRS port number and DMRS port number or the number of layers.And when the base station is used the MBSFN subframe to relay station transmission data, will there be CRS in the 3rd the OFDM symbol OFDM symbol afterwards.

Should be appreciated that the DMRS pattern in this example just plays description and explains purpose of the present invention, and also paired inadequately restriction of the present invention.

Example 8

A kind of example of repeated link data mapping method is provided in this example.Concrete, when the relaying link data transmits under diversity mode, for flexibility and the rational expense that guarantees corresponding DMRS design, the diversity port number of restriction repeated link diversity transmission.

In the LTE-A system, the antenna port of base station can expand to 8, and the diversity of 8 ports transmission can't bring than 4 port diversity and more obviously gains, but but can cause corresponding DMRS design to become comparatively complicated, and the expense of DMRS increases.Therefore, can limit the diversity port number of repeated link transfer of data.For example, when base station configuration has 8 antenna ports, only adopt 4 port diversity transmission, perhaps even the transmission of 2 port diversity.The at this time corresponding DMRS that only needs 4 or 2 ports.

For example, the port number unification of repeated link downlink data diversity transmission is defined as the port number of CRS in the current subframe.

For example, when the antenna for base station port number greater than 2 the time, the port number of the descending control data transmission of repeated link is restricted to 2.

For example, when the antenna for base station port number greater than 4 the time, the port number of repeated link downlink data diversity transmission is restricted to 4.

When limiting the port number of diversity transmission, can in the antenna for base station port, select a part of port as the antenna port that transmits under the diversity mode, the antenna port number of selection is the port number of diversity transmission.

When limiting the port number of diversity transmission, also can adopt the method for virtual-antenna to carry out data map.For example, the antenna port of base station be 0,1,2,3,4,5,6,7}, the port number of diversity transmission is 2, antenna port can be grouped into so 0,2,4,6} and { 1,3,5,7} is as two virtual ports.On these two virtual ports, shine upon identical data and DMRS.At receiving terminal, DMRS and data only are to use 2 ports to transmit.

Example 9

Receiving terminal before carrying out channel estimating, need be known the port number or the number of layers of transfer of data after receiving data, promptly the port number of corresponding DMRS or number of layers are carried out channel estimating with coupling corresponding D MRS pattern.This example will provide the indicating means of some DMRS port numbers (or number of layers).

Under diversity transmission mode, can between the DMRS port number of diversity transmission and CRS port number, set up mapping relations, it is identical with the CRS port number for example to limit the DMRS port number that diversity transmits.When the port number of DMRS port number and CRS was identical, relay station received the data of Physical Broadcast Channel, obtains the port number of CRS transmission by the CRC mask of Physical Broadcast Channel, thereby obtains the DMRS port number of diversity transmission.The acquisition of concrete CRS port number is identical with the preparation method of terminal among the LTE, repeats no more here.

Under diversity transmission mode, can indicate the port number of diversity transmission by the CRC mask of repeated link Physical Broadcast Channel.Here the CRC mask can adopt with the LTE system in the identical design of CRC mask of Physical Broadcast Channel, repeat no more here.

Under diversity transmission mode, also can between antenna for base station port number and diversity transmit port number, set up mapping relations.For example when the antenna for base station port number greater than 2 the time, diversity transmit port number is restricted to 2; Perhaps when the antenna for base station port number greater than 4 the time, diversity transmit port number is restricted to 4.This mapping relations limit between base station and relay station.Obtain the information of antenna for base station port number when relay station after, just can imply the port number that obtains the diversity transmission.

Also can indicate the port number of diversity transmission or the number of layers of multiplexing transmission by this indicating bit to relay station by in the DCI (Downlink Control Information, Downlink Control Information are called for short DCI) of repeated link, increasing indicating bit.

Device embodiment

According to embodiments of the invention, a kind of base station is provided, this base station can be used for the transmission of the descending demodulated reference signal of repeated link.

Figure 17 is the structured flowchart according to the base station of the embodiment of the invention, and as shown in figure 17, this base station comprises memory module 1700, relating module 1710, mapping block 1720, sending module 1730.Below said structure is specifically described.

Memory module 1700, being used to store will be from the pattern of the demodulated reference signal of base station transmits;

Relating module 1710 is connected to memory module 1700, is used for the described demodulated reference signal pattern of storing according to the port number or the related corresponding memory module of number of layers of transfer of data;

Mapping block 1720 is connected to relating module 1710, is used for the related demodulated reference signal pattern that obtains according to relating module and demodulated reference signal is mapped in when corresponding-the two-dimentional physical resource of frequency;

Sending module 1730 is used to transmit corresponding demodulated reference signal.

Figure 18 is the block diagram of optimizing structure according to the base station of the embodiment of the invention.As shown in figure 18, this base station comprises processing module 1810, adjusts submodule 1820, indication information generation module 1830, below said structure is specifically described.

Processing module 1810 is used to set the port number of repeated link transfer of data under the diversity mode, when base station port number during greater than N (N＞1), port number is defined as N, N≤4.The method that limits can be to select N port transmission in the antenna for base station port, and it is individual that the mode that perhaps adopts virtual-antenna is mapped as N with the antenna port number of base station.

Relating module 1710 also comprises adjusts submodule 1820, is used to adjust the pattern of DMRS, comprises the adjustment of time orientation and/or the adjustment of frequency direction.Adjusting module 1820 comprises that further first adjusts the submodule 1821 and the second adjustment submodule 1822.First adjusts the OFDM character position that difference that submodule 1821 is responsible for the OFDM symbol that demodulated data takies at time orientation according to system bandwidth or DMRS is adjusted described demodulated reference signal mapping; Second adjusts the adjustment that submodule 1822 is sub-carrier positions of DMRS pattern mapping, such as number determine the sub-carrier positions that described demodulated reference signal shines upon in Physical Resource Block according to Physical Cell Identifier.

Indication information generation module 1830 is used to generate indication information, and described indication information is used for port number or the number of layers of base station to the transmission of relay station indication demodulated reference signal.

Should be noted that adjustment submodule described herein is optional module, only when the DMRS pattern need be adjusted, just can comprise this module.

According to embodiments of the invention, a kind of relay station is provided, this relay station is used for the processing of the descending demodulated reference signal of repeated link.

Figure 19 is the structured flowchart according to the relay station of the embodiment of the invention.As shown in figure 19, this relay station comprises receiver module 1910, below said structure is specifically described.

Receiver module 1910 is used to receive the DMRS that sending module 1730 sends, and this DMRS is non-precoding reference signal, is used for the coherent demodulation of repeated link downlink data transmission.

Further, this relay station comprises indication information receiver module 1920, is used to receive the indication information that indication information generation module 1830 generates, and this indication information is used for the port number that relay station is determined repeated link DMRS.

System embodiment

According to embodiments of the invention, a kind of relay system is provided, this relay system can be used for the transmission of the descending demodulated reference signal of repeated link.

Figure 20 is the structured flowchart according to the relay system of the embodiment of the invention, as shown in figure 20, relay system comprises base station 18 and relay station 19, wherein, the structure of describing among the structure of this base station 18 and relay station 19 and the above-mentioned device embodiment is identical, the implementation procedure of its concrete function had been carried out detailed description in device embodiment, do not repeat them here.

In sum,, solved the transmission problem of repeated link demodulated reference signal, guaranteed the repeated link reliability of data transmission, and can the terminal in the same sub-district not exerted an influence by method of the present invention and base station and relay station.Simultaneously, the port number when setting the diversity transmission under the prerequisite that guarantees the diversity transmission gain, has reduced the expense of demodulated reference signal and the complexity of design.

Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (29)

1. the transmission method of the descending demodulated reference signal of repeated link is characterized in that, described method comprises:

When demodulated reference signal is mapped in-frequently on the two-dimentional resource, wherein, described demodulated reference signal is non-precoding reference signal, is used for the coherent demodulation of repeated link downlink data transmission.

2. method according to claim 1, it is characterized in that, described repeated link downlink data comprise following one of at least: the data of the descending control data of repeated link, repeated link Physical Broadcast Channel and the data of repeated link Physical Downlink Shared Channel, wherein, the descending control data of described repeated link comprise following one of at least: the data of repeated link Physical Downlink Control Channel, the descending control format indication information of repeated link, repeated link down mixing self-retransmission indication information.

3. method according to claim 1 is characterized in that, when described-and two-dimentional resource comprises the transmission Physical Resource Block that described downlink data distributed in frequency direction frequently.

4. method according to claim 1 is characterized in that, when described-and two-dimentional resource is carried the orthogonal frequency division multiplex OFDM symbol of described repeated link downlink data in time orientation comprises a downlink relay sub-frame frequently.

5. method according to claim 3 is characterized in that, number adjusts the sub-carrier positions that described demodulated reference signal shines upon according to Physical Cell Identifier in Physical Resource Block.

6. method according to claim 4 is characterized in that, the OFDM character position of described demodulated reference signal mapping is fixing in Physical Resource Block.

7. method according to claim 4 is characterized in that, adjusts the OFDM character position of described demodulated reference signal mapping according to system bandwidth; Perhaps

The difference of the OFDM symbol that takies according to described repeated link downlink data is adjusted the OFDM character position of described demodulated reference signal mapping.

8. method according to claim 1 is characterized in that, described method also comprises:

The layer of the port of described demodulated reference signal and described repeated link downlink data transmission or described repeated link downlink data transmission is related corresponding.

9. method according to claim 8, it is characterized in that, under the transmit diversity transmission mode, described demodulated reference signal is corresponding with the port association of described repeated link downlink data transmission, wherein, when described repeated link downlink data when the port of a plurality of described repeated link downlink data transmission transmits, related mutually orthogonal corresponding to the demodulated reference signal of the described repeated link downlink data transmission of difference port.

10. method according to claim 8, it is characterized in that under the space division multiplexing transmission mode, described demodulated reference signal pattern is related corresponding with the number of layers of described repeated link downlink data transmission, when carrying out the multilayer transmission, related mutually orthogonal corresponding to the demodulated reference signal of each layer.

11. according to claim 9 or 10 described methods, it is characterized in that, described orthogonal manner comprise following one of at least: time division multiplexing TDM, frequency division multiplex FDM, code division multiplex CDM.

12. the processing method of a repeated link downlink data is characterized in that, described method comprises:

Set the port number of described repeated link downlink data transmission under the diversity mode, when antenna for base station port number during greater than N, the port number of described repeated link downlink data transmission is set at N, N is smaller or equal to 4.

13. method according to claim 12 is characterized in that, the mode of setting is:

N transfer of data of carrying out under the diversity transmission mode in the antenna port used in the base station; Perhaps

The virtual-antenna port technique is adopted in the base station, and data transmission port is mapped as N.

14. method according to claim 12 is characterized in that, it is one of following that the number of the port of described repeated link downlink data transmission comprises:

2,4, the port number of public reference signal CRS in the current subframe.

15. the indicating means of a demodulated reference signal port number is characterized in that, described indicating means comprises:

The base station is to the port number of the descending demodulated reference signal of relay station indication repeated link, and described indicating means is indirect indicating means and/or direct indicating means.

16. method according to claim 15 is characterized in that, it is one of following that described indirect indicating means comprises:

The port number of described demodulated reference signal and first mapping relations between the antenna for base station port number are set up in described base station, and indicate the port number of described demodulated reference signal according to described first mapping relations;

The port number of described demodulated reference signal is indicated in described base station to described relay station by the CRC mask of repeated link Physical Broadcast Channel;

Second mapping relations between the port number of the port number of described demodulated reference signal and base station public reference signal are set up in described base station, and indicate the port number of described demodulated reference signal according to described second mapping relations.

17. indicating means according to claim 16, described base station are set up first mapping relations of the port number and the antenna for base station port number of described demodulated reference signal, it is one of following that described first mapping relations comprise:

When the antenna for base station port number was 1, the port number of described demodulated reference signal was 1, when the antenna for base station port number more than or equal to 2 the time, the port number of described demodulated reference signal is 2; Perhaps

When the antenna for base station port number was 1 or 2, the port number of described demodulated reference signal was 1 or 2, when the antenna for base station port number more than or equal to 4 the time, the port number of described demodulated reference signal is 4.

18. indicating means according to claim 16, described base station are set up after second mapping relations between the port number of the port number of described demodulated reference signal and base station public reference signal, described method also comprises:

Described relay station obtains described base station public reference signal port number by the CRC mask of base station physical broadcast channel, is obtained the port number of described demodulated reference signal by described second mapping relations;

Described mapping relations are that the port number of described demodulated reference signal equals described base station public reference signal port number.

19. method according to claim 15 is characterized in that, described direct indicating means comprises:

The port number of described descending demodulated reference signal is indicated by the indicating bit in the repeated link descending control signaling.

20. a base station is characterized in that, described base station comprises:

Memory module, being used to store will be from the demodulated reference signal pattern of described base station transmits;

Relating module is used for the described demodulated reference signal pattern of storing according to the port number or the related corresponding memory module of number of layers of transfer of data;

Mapping block is used for the demodulated reference signal pattern that obtains according to relating module and demodulated reference signal is mapped in when corresponding-the two-dimentional resource of frequency;

Sending module is used to transmit corresponding demodulated reference signal, and wherein, described demodulated reference signal is non-precoding reference signal, is used for the repeated link downlink data is carried out coherent demodulation.

21. base station according to claim 20, described relating module comprises the adjustment submodule, is used for adjusting described demodulated reference signal pattern at time orientation and/or frequency direction.

22. base station according to claim 21 is adjusted submodule and is also comprised,

First adjusts submodule, is used for adjusting according to system bandwidth the orthogonal frequency division multiplex OFDM character position of described demodulated reference signal mapping; Perhaps the difference of the OFDM symbol that takies according to described repeated link downlink data is adjusted the OFDM character position of described demodulated reference signal mapping;

Second adjusts submodule, is used for number adjusting the sub-carrier positions that described demodulated reference signal shines upon at Physical Resource Block according to Physical Cell Identifier.

23. base station according to claim 20, described base station also comprises processing module, be used to set the port number of described repeated link downlink data transmission under the diversity mode, when antenna for base station port number during greater than N, the port number of described repeated link downlink data transmission is set at N, and N is smaller or equal to 4.

24. N the port as described repeated link downlink data transmission determined in base station according to claim 23, described processing module in the antenna port of base station; Perhaps

The mode of employing virtual port is mapped as N with the port number of described repeated link downlink data transmission.

25. base station according to claim 20, described base station also comprises the indication information generation module, be used to generate the descending indication information of repeated link, the descending indication information of described repeated link is used for the base station to port number or the number of layers of relay station indication association corresponding to the described repeated link downlink data transmission of described demodulated reference signal.

26. indicate one of in the following manner base station according to claim 25, described indication information generation module:

The descending indication information of described repeated link is the CRC mask of repeated link Physical Broadcast Channel, and the port number of described demodulated reference signal is indicated by the CRC mask of repeated link Physical Broadcast Channel;

The descending indication information of described repeated link is the indication information of antenna for base station port number, the port number of described demodulated reference signal and first mapping relations between the antenna for base station port number are set up in described base station, and indicate the port number of described demodulated reference signal according to described first mapping relations;

Described indication information is the indication information of base station public reference signal port number, the port number of described demodulated reference signal and second mapping relations between the public reference signal port number of base station are set up in described base station, and indicate the port number of described demodulated reference signal according to described second mapping relations.

27. a relay station is characterized in that, comprising:

Receiver module is used to receive the descending demodulated reference signal of repeated link, and the descending demodulated reference signal of described repeated link is non-precoding reference signal, is used for the coherent demodulation of repeated link downlink data transmission.

28. relay station according to claim 27, described relay station also comprises the indication information receiver module, be used to receive the descending indication information of described repeated link that described indication information generation module generates, the descending indication information of described repeated link is used for relay station and determines port number or the number of layers of association corresponding to the described repeated link downlink data transmission of described demodulated reference signal.

29. a relay system is characterized in that, comprising: base station and relay station, wherein, described base station comprises:

Memory module, being used to store will be from the demodulated reference signal pattern of described base station transmits;

Relating module is used for the described demodulated reference signal pattern of storing according to the port number or the related corresponding described memory module of number of layers of transfer of data;

Mapping block is used for the demodulated reference signal pattern that obtains according to described relating module and demodulated reference signal is mapped in when corresponding-the two-dimentional resource of frequency;

Sending module is used to transmit corresponding demodulated reference signal, and wherein, described demodulated reference signal is non-precoding reference signal, is used for the repeated link downlink data is carried out coherent demodulation;

Described relay station comprises:

Receiver module is used to receive the descending demodulated reference signal of repeated link, and the descending demodulated reference signal of described repeated link is non-precoding reference signal, is used for the coherent demodulation of repeated link downlink data transmission.

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