CN103095631A - Transmission method, allocation method and device of downlink reference signal - Google Patents

Abstract

The invention discloses a transmission method, an allocation method and a device of a downlink reference signal, wherein the transmission method includes the following steps. In a subframe of a carrier wave, a time domain position of the downlink reference signal is confirmed and transmitted by a regulated manner and frequency domain intervals of the downlink reference signal are confirmed to be the designated number of reference signals (RE). The downlink reference signal is transmitted according to the confirmed time domain position and the frequency domain intervals. With the transmission method, the allocation method and the device of the downlink reference signal, small resource expenditure is used with the confirmed time domain position of the downlink reference signal and user equipment (UE) can perform synchronization and tracking of a carrier wave according to the downlink reference signal so that the problem that a carrier wave synchronization and tracking mechanism is not complete and the utilization rate of the carrier wave is improved.

Description

The sending method of downlink reference signal, collocation method and device

Technical field

The present invention relates to the communications field, in particular to a kind of sending method, collocation method and device of downlink reference signal.

Background technology

development along with Mobile Communication Industry, and to the continuous growth of mobile data services demand, speed and service quality (the Quality of Service of people to mobile communication, QoS) requirement is more and more higher, so before 3G (Third Generation) Moblie (3G) does not also have extensive commercialization, just begun the research-and-development activity to next generation mobile communication system, wherein relatively be typically third generation partner program (3rd Generation Partnership Project, Long Term Evolution (the Long Term Evolution that 3GPP) starts, LTE) project, the available maximum spectrum bandwidth of LTE system is 20MHz (megahertz).Along with the further evolution of network, LTE-A (evolution LTE) can provide the spectral bandwidth up to 100MHz as the evolution system of LTE, supports more flexible higher-quality communication, and the while, the LTE-A system possessed good backwards compatibility.In the LTE-A system, a plurality of component carriers (CC, Component Carrier) are arranged, a LTE terminal can only be operated on the CC of some backward compatibility, and the stronger LTE-A terminal of ability can be transmitted on a plurality of CC simultaneously.The terminal that namely realizes LTE-A is transmitted and receive data in a plurality of component carriers simultaneously, thereby reaches the purpose that promotes bandwidth.This technology is called as the multi-carrier polymerizing technology.

Support the multi-carrier polymerizing technology in the LTE-A system, namely the base station uses a plurality of carrier waves to be the UE the transmission of data simultaneously, and UE is receive data in a plurality of carrier waves simultaneously.Ripe and development along with multi-transceiver technology, in order further to promote in multicarrier system, some spectrum of carrier efficient, carrier wave configuration in multicarrier in some the existing LTE-A of proposition expectation simplification systems of companies, delete the modes such as channel in some carrier waves, the channel resource of deleting is provided to transmit the data of UE.In multicarrier system, do not configure in carrier wave or reduce and configure original control channel resource, for example do not configure the PDCCH channel in some carrier waves, do not configure CRS (Cell-specific reference signals, cell special reference), do not configure PSS (main synchronizing sequence)/SSS (secondary synchronization sequences), like this, the resource that these carrier waves are used for the transmission of data can increase, thereby has promoted spectrum efficiency, and these carrier waves are called as new carrier wave.simple replenishing do not configure the PDCCH channel in new carrier wave, do not configure CRS (cell special reference), do not configure the reason of PSS/SSS, above-mentioned three channels or signal are in the HetNet scene based on multi-carrier polymerizing, if it is subordinate's separately UE service that base station and RRH adopt same carrier wave, so at base station and RRH (Remote radio head, the long distance wireless head) in the region that has a common boundary, send PDCCH in base station and RRH in same carrier wave, CRS, the interference of PSS/SSS is very serious, so after having deleted above-mentioned configuration, can effectively suppress the interference under above-mentioned scene.

Above-mentioned new carrier wave is obviously not support backward compatibility, does not namely support the UE of early stage LTE-A to work therein.For the UE of redaction, how to work in new carrier wave again so? the current scheme that a few thing is arranged, but be in-problem in some aspects, think by analysis to have some problems, see following description.

As shown in Figure 1 above-mentioned is operated in UE in new carrier wave and the schematic diagram of the method for synchronization between new carrier wave, wherein, two carrier wave pairings are used in the base station, one of them carrier wave is the configuration of backward compatibility carrier wave, another carrier wave is the configuration mode of new carrier wave, does not for example configure in new carrier wave and sends PSS/SSS and CRS.UE utilizes the PSS/SSS of backward compatibility carrier wave to complete itself and the synchronizeing of new carrier wave so, be that UE receives and detect the PSS/SSS in the backward compatibility carrier wave, complete and the synchronizeing of backward compatibility carrier wave, then UE just thinks that new carrier wave aligns with the backward compatibility carrier wave, also synchronizes with new carrier wave so just think own.UE is also similar principles for the synchronous tracking of new carrier wave, UE is by receiving the CRS in the backward compatibility carrier wave, thereby calculate the time-frequency deviation complete itself and backward compatibility carrier wave, and utilize this time-frequency deviation calibration backward compatibility carrier wave and new carrier wave, thereby complete its with the backward compatibility carrier wave and newly carrier wave synchronize tracing process.But carefully analyze above-mentioned process, exist problem under some scenes.

For convenience of description, with above-mentioned new carrier wave and backward compatibility carrier wave synchronize and synchronous the tracking is divided into following several scene:

Scene 1, base station by belonging to same band (frequency band) new carrier wave and the backward compatibility carrier wave to the UE the transmission of data, and two carrier waves are that the experience same node point sends to UE.

Scene 2, base station by belonging to different band new carrier wave and the backward compatibility carrier wave to the UE the transmission of data, and two carrier waves experience same node point send to UE.

Scene 3, base station by belonging to same band or different band new carrier wave and the backward compatibility carrier wave to the UE the transmission of data, and two different nodes of carrier waves experience send to UE.

For above-mentioned the 1st scene, can adopt aforesaid way to realize synchronizeing and following the tracks of of UE and new carrier wave.That is to say, in scene 1, can not configure PSS/SSS and CRS in new carrier wave, the UE that is operated in new carrier wave also can complete the synchronous of new carrier wave and follow the tracks of by the PSS/SSS in the backward compatibility carrier wave and CRS.So scene 1 is used for the resource of the transmission of data maximum in new carrier wave.

In the 2nd above-mentioned scene, new carrier wave and backward compatibility carrier wave do not belong to same band, even experience same node point, the Doppler effect that the carrier transmission performance (obstacle ability, penetration capacity) that also may bring due to the frequency range of carrier wave different (for example is 2GHz, and another is 900MHz) and the translational speed of UE are brought and cause to synchronize and to follow the tracks of between new carrier wave and backward compatibility carrier wave.And because two carrier waves are that the identical node of experience arrives UE's, so substantially may can guarantee (referring to that the synchronous requirement that PSS/SSS provides should guarantee) in two carrier synchronization of time orientation, but synchronous tracking may not be satisfied (referring to the time-frequency deviation calibration of CRS), the particularly tracking of frequency direction, or frequency deviation is estimated.

In the 3rd above-mentioned scene, new carrier wave and backward compatibility carrier wave, no matter whether in same band, be transferred to UE mainly due to the different node of experience, because different transmission node, time delay is different, is easy to cause the UE can not be in a manner mentioned above, utilizes PSS/SSS and CRS in the backward compatibility carrier wave to keep itself and the synchronizeing and follow the tracks of of new carrier wave.

Synchronous and the incomplete problem of follow-up mechanism for carrier wave in correlation technique not yet proposes effective solution at present.

Summary of the invention

For the synchronous and incomplete problem of follow-up mechanism of above-mentioned carrier wave, the invention provides a kind of sending method, collocation method and device of downlink reference signal, to address the above problem at least.

According to an aspect of the present invention, a kind of sending method of downlink reference signal is provided, comprise: in a subframe of carrier wave, one of in such a way determine to send the time-domain position of downlink reference signal: be one or more orthogonal frequency division multiplex OFDM symbols of the CRS position that is arranged in the PDSCH zone; For being arranged in an OFDM symbol in PDSCH zone; An OFDM symbol for the CRS position that is arranged in the PDCCH zone; For being positioned at an OFDM symbol in PDCCH zone; Determine that the frequency domain interval of downlink reference signal is for specifying a RE; Send downlink reference signal according to the time-domain position of determining and frequency domain interval.

The one or more OFDM symbols that are arranged in the CRS position in PDSCH zone comprise: one or more OFDM symbols of third from the bottom OFDM symbol of first time slot of subframe, first OFDM symbol of second time slot of subframe and third from the bottom OFDM symbol of second time slot of subframe.

Downlink reference signal sent according to cycle interval time of setting.

Be 1 millisecond, 2 milliseconds, 3 milliseconds, 4 milliseconds or 5 milliseconds the interval time of setting.

The initial subframe that sends downlink reference signal is the 2nd work song frame or the 3rd work song frame in carrier wave.

Sending downlink reference signal according to the time-domain position of determining and frequency domain interval comprises: the frequency domain that the selection downlink reference signal uses is the partial continuous bandwidth of the appointment of carrier wave; Wherein, the partial continuous bandwidth of this appointment is that one or more subbands of described carrier wave are wide.

The partial continuous bandwidth of above-mentioned appointment is fixed-bandwidth or the fixed resource piece RB that is positioned at the center frequency point of carrier wave.

The partial continuous bandwidth 1.4Mhz of above-mentioned appointment or 6 RB.

Sending downlink reference signal according to the time-domain position of determining and frequency domain interval comprises: determine according to the parameter that sets in advance the frequency domain bandwidth that downlink reference signal uses.

The time-domain position of determining is one of following: last the OFDM symbol that is arranged in first time slot of subframe;

Be arranged in first time slot penultimate of subframe OFDM symbol; Be arranged in first OFDM symbol of second time slot of subframe; Be arranged in second OFDM symbol of second time slot of subframe; Be arranged in last OFDM symbol of first time slot of subframe and second first OFDM symbol of time slot; Be arranged in third from the bottom OFDM symbol of first time slot of above-mentioned subframe and the 4th OFDM symbol of second time slot; Be arranged in third from the bottom OFDM symbol of first time slot of above-mentioned subframe and second first OFDM symbol of time slot; Be arranged in third from the bottom OFDM symbol of first time slot of above-mentioned subframe and second OFDM symbol of second time slot; Be arranged in third from the bottom OFDM symbol of first time slot of above-mentioned subframe and second time slot first and the 5th OFDM symbol; Be arranged in third from the bottom OFDM symbol of first time slot of above-mentioned subframe and second and the 6th OFDM symbol of second time slot; Be arranged in third from the bottom OFDM symbol of first time slot of above-mentioned subframe and the 3rd and the 7th OFDM symbol of second time slot; Be arranged in third from the bottom OFDM symbol of first time slot of above-mentioned subframe and second and the 7th OFDM symbol of second time slot.

Downlink reference signal uses the sequence generating mode identical with CRS in long evolving system version 10 to generate,, and intercept the corresponding sequence of subband according to the amount of bandwidth of subband from the sequence that generates.

Sending downlink reference signal according to the time-domain position of determining and frequency domain interval comprises: the subframe that will carry described downlink reference signal is divided into the n group, and wherein, n is the integer more than or equal to 1; Determine to send the subframe of described downlink reference signal and the transmitted power of downlink reference signal described in the described subframe of determining according to grouping information and power configuration information.

An above-mentioned appointment RE is 6 RE.

According to a further aspect in the invention, a kind of collocation method of downlink reference signal is provided, comprise: in a subframe of carrier wave, the time-domain position of configurating downlink reference signal one of in such a way: be one or more OFDM symbols of the CRS position that is arranged in the PDSCH zone; For being arranged in an OFDM symbol in PDSCH zone; An OFDM symbol for the CRS position that is arranged in the PDCCH zone; For being positioned at an OFDM symbol in PDCCH zone; The frequency domain interval of configurating downlink reference signal is for specifying a RE.

The time-domain position of downlink reference signal of configuration is one of following: third from the bottom OFDM symbol of first time slot in subframe, and second first OFDM symbol of time slot selected one or more OFDM symbols in third from the bottom OFDM symbol of second time slot; Last OFDM symbol of first time slot in subframe; First time slot penultimate OFDM symbol in subframe; Second first OFDM symbol of time slot in subframe; Second OFDM symbol of second time slot in subframe; Last OFDM symbol of first time slot and second first OFDM symbol of time slot in subframe; Third from the bottom OFDM symbol of first time slot and the 4th OFDM symbol of second time slot in above-mentioned subframe; Third from the bottom OFDM symbol of first time slot and second first OFDM symbol of time slot in above-mentioned subframe; Third from the bottom OFDM symbol of first time slot and second OFDM symbol of second time slot in above-mentioned subframe; First and the 5th OFDM symbol of third from the bottom OFDM symbol of first time slot and second time slot in above-mentioned subframe; Third from the bottom OFDM symbol of first time slot and second and the 6th OFDM symbol of second time slot in above-mentioned subframe; Third from the bottom OFDM symbol of first time slot and the 3rd and the 7th OFDM symbol of second time slot in above-mentioned subframe; Third from the bottom OFDM symbol of first time slot and second and the 7th OFDM symbol of second time slot in above-mentioned subframe.

An above-mentioned appointment RE is 6 RE.

In accordance with a further aspect of the present invention, a kind of dispensing device of downlink reference signal is provided, comprise: the time-domain position determination module, be used for a subframe at carrier wave, one of in such a way determine to send the time-domain position of downlink reference signal: be one or more OFDM symbols of the CRS position that is arranged in Physical Downlink Shared Channel PDSCH zone; For being arranged in an OFDM symbol in PDSCH zone; An OFDM symbol for the CRS position that is arranged in the PDCCH zone; For being positioned at an OFDM symbol in PDCCH zone; The frequency domain interval determination module is used for the frequency domain interval of the definite downlink reference signal of definite time-domain position determination module for specifying a RE; Sending module, the time-domain position and the definite frequency domain interval of frequency domain interval determination module that are used for determining according to the time-domain position determination module send downlink reference signal.

According to another aspect of the invention, a kind of inking device of downlink reference signal is provided, comprise: the time-domain position configuration module, be used for a subframe at carrier wave, one of in such a way the time-domain position of configurating downlink reference signal: be one or more OFDM symbols of the CRS position that is arranged in Physical Downlink Shared Channel PDSCH zone; For being arranged in an OFDM symbol in PDSCH zone; An OFDM symbol for the CRS position that is arranged in the PDCCH zone; For being positioned at an OFDM symbol in PDCCH zone; The frequency domain interval configuration module, the frequency domain interval that is used for the downlink reference signal of configuration time-domain position configuration module configuration is an appointment RE.

By the present invention, after adopting aforesaid way to determine the time-domain position of downlink reference signal, can use less resource overhead to send downlink reference signal, and can make UE carry out the synchronous of carrier wave and follow the tracks of according to this downlink reference signal, solve the synchronous and incomplete problem of follow-up mechanism of carrier wave, improved the utilance of carrier wave.

Description of drawings

Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:

Fig. 1 is UE in carrier wave new for being operated in of correlation technique and the schematic diagram of the method for synchronization between new carrier wave;

Fig. 2 is the sending method flow chart according to the downlink reference signal of the embodiment of the present invention;

Fig. 3-10th is according to the schematic diagram of the mapping pattern of downlink reference signal in RB of the embodiment of the present invention;

Figure 11-14th is according to the schematic diagram of the mapping pattern of downlink reference signal in RB of 3 OFDM symbols of use of the embodiment of the present invention;

Figure 15 is according to the subband schematic diagram in the carrier wave of the embodiment of the present invention;

Figure 16 is the collocation method flow chart according to the downlink reference signal of the embodiment of the present invention;

Figure 17 is the structured flowchart according to the dispensing device of the downlink reference signal of the embodiment of the present invention;

Figure 18 is the structured flowchart according to the inking device of the downlink reference signal of the embodiment of the present invention;

Figure 19-24th is according to the carrier wave schematic diagram of the embodiment of the present invention;

Figure 25 is to be the downlink reference signal transmission pattern schematic diagram of 2ms according to part continuous bandwidth in the employing carrier wave of the embodiment of the present invention and configuration transmission cycle.

Embodiment

Hereinafter also describe in conjunction with the embodiments the present invention in detail with reference to accompanying drawing.Need to prove, in the situation that do not conflict, embodiment and the feature in embodiment in the application can make up mutually.

in LTE, the subframe duration is 1ms (millisecond), comprise altogether 14 OFDM (Orthogonal Frequency Division Multiplex OFDM) symbol, wherein, subframe is divided into PDCCH territory (Physical Downlink Control Channel, Physical Downlink Control Channel) and PDSCH (Physical Downlink Shared Channel, Physical Downlink Shared Channel) territory, wherein the PDCCH territory takies front 1～4 the OFDM symbol of subframe, concrete symbolic number is dynamic-configuration, remove the PDCCH territory in subframe, 13～10 of remaining back OFDM symbol is the PDSCH territory.CRS in LTE is also a kind of reference signal, specifically can be with reference to describing in 36.211 agreements.In LTE, RB is defined as: 7 OFDM symbols of time domain, and 12 subcarriers of frequency domain (in LTE, subcarrier spacing is 15KHz) consist of, and a pair of RB refers to that frequency domain comprises identical subcarrier, and time domain is 1ms.In LTE, a subframe is divided into 2 time slots, and 7 of fronts OFDM symbol consists of first time slot, and 7 of back OFDM symbol consists of second time slot.

Based on the building form of subframe in the carrier wave of above-mentioned LTE and LTE-A, the embodiment of the present invention provides a kind of sending method, collocation method and device of downlink reference signal, is described below by following examples.

The present embodiment provides a kind of sending method of downlink reference signal, and the method can realize on the network equipments such as base station.The sending method flow chart of downlink reference signal as shown in Figure 2 comprises the following steps (step S202-step S206):

Step S202, in a subframe of carrier wave, mode according to the rules determine to send the time-domain position of downlink reference signal, and wherein, the mode of regulation is one of following:

1) be one or more OFDM symbols of the CRS position that is arranged in the PDSCH zone;

2) for being arranged in an OFDM symbol in PDSCH zone;

3) be an OFDM symbol of the CRS position that is arranged in the PDCCH zone;

4) for being positioned at an OFDM symbol in PDCCH zone;

Step S204 determines that the frequency domain interval of above-mentioned downlink reference signal is for specifying a RE (Resource element, Resource Unit) (for example 6 RE);

Step S206 sends above-mentioned downlink reference signal according to above-mentioned definite time-domain position and frequency domain interval.

After the present embodiment is determined the time-domain position of downlink reference signal by the way, can use less resource overhead to send downlink reference signal, and can make UE carry out the synchronous of carrier wave and follow the tracks of according to this downlink reference signal, solve the synchronous and incomplete problem of follow-up mechanism of carrier wave, improved the utilance of carrier wave.

One or more OFDM symbols of the CRS position in the above-mentioned PDSCH of being arranged in zone comprise: one or more OFDM symbols of third from the bottom OFDM symbol of first time slot of above-mentioned subframe, first OFDM symbol of second time slot of above-mentioned subframe and third from the bottom OFDM symbol of second time slot of above-mentioned subframe.

It is one of following that the time-domain position of determining in the present embodiment is preferably:

Be arranged in last OFDM symbol of above-mentioned first time slot of subframe;

Be arranged in first time slot penultimate of above-mentioned subframe OFDM symbol;

Be arranged in first OFDM symbol of second time slot of above-mentioned subframe;

Be arranged in second OFDM symbol of second time slot of above-mentioned subframe;

Be arranged in last OFDM symbol of first time slot of above-mentioned subframe and second first OFDM symbol of time slot;

Be arranged in third from the bottom OFDM symbol of first time slot of above-mentioned subframe and the 4th OFDM symbol of second time slot;

Be arranged in third from the bottom OFDM symbol of first time slot of above-mentioned subframe and second first OFDM symbol of time slot;

Be arranged in third from the bottom OFDM symbol of first time slot of above-mentioned subframe and second OFDM symbol of second time slot;

Be arranged in third from the bottom OFDM symbol of first time slot of above-mentioned subframe and second time slot first and the 5th OFDM symbol;

Be arranged in third from the bottom OFDM symbol of first time slot of above-mentioned subframe and second and the 6th OFDM symbol of second time slot;

Be arranged in third from the bottom OFDM symbol of first time slot of above-mentioned subframe and the 3rd and the 7th OFDM symbol of second time slot;

Be arranged in third from the bottom OFDM symbol of first time slot of above-mentioned subframe and second and the 7th OFDM symbol of second time slot.

Downlink reference signal in the present embodiment can send according to cycle interval time of setting, be preferably the interval time of this setting 1 millisecond (ms), 2 milliseconds, 3 milliseconds, 4 milliseconds or 5 milliseconds.This cycle can dynamic-configuration.For example, the base station can be selected to select one from a plurality of transmission cycle, and notice is to UE.Consider that downlink reference signal Main Function in the present invention is to help UE to realize the tracking of synchronizeing with carrier wave, preferably, set out in synchronous performance of following the tracks of and the angle of signal overhead balance, by emulation, provide the preferred transmission cycle can be configured to 1ms or 2ms or 3ms or 4ms or 5ms.Sending the cycle for downlink reference signal is not the situation of 1ms, and the initial subframe that the configurating downlink reference signal sends is #2 or #3.Like this can and existing PSS and SSS between consist of time domain even distribution, particularly transmission cycle be in the situation of 5ms.

The initial subframe that the present embodiment preferably sends downlink reference signal is the 2nd work song frame (being the #2 subframe) or the 3rd work song frame (being the #3 subframe) in carrier wave.

Consider that the signaling consumption of downlink reference signal and main purpose are in order to carry out the tracking of synchronizeing of UE and carrier wave, send and the configurating downlink reference signal so adopt the present invention to use below adopting in the partial continuous bandwidth of the whole bandwidth of carrier wave, also namely select frequency domain that downlink reference signal uses to be the partial continuous bandwidth of the appointment of carrier wave; Wherein, the partial continuous bandwidth of this appointment is that one or more subbands of carrier wave are wide.The embodiment of the present invention also provides a plurality of partial continuous bandwidth with the whole bandwidth of carrier wave to send, and remaining bandwidth does not send downlink reference signal.For example 2 of selections or 3 continuous bandwidth send downlink reference signal from whole bandwidth of carrier wave, and the carrier wave remaining bandwidth does not send downlink reference signal.

The position of the frequency domain of downlink reference signal use the partial continuous bandwidth (also claiming subband) of the whole bandwidth of carrier wave to carry ripple, and the present invention also can use the whole bandwidth of carrier wave to shine upon with reference to signal.The size of described subband can be approximately to be decided to be fixed-bandwidth, and 1.4MHz (according to corresponding 6 RB of the size regulation of the RB in LTE) for example is because the minimum bandwidth that 1.4MHz is the LTE system to be supported.Certainly the size of subband can also be other fixed numbers, and the size for subband is mainly that the expense ratio carrier wave is determined from downlink reference signal here.When using the partial continuous bandwidth to send downlink reference signal in carrier wave, described partial continuous bandwidth is arranged in the resource (perhaps being described as RB corresponding to described continuous part bandwidth is the RB that is positioned at the carrier wave centre position) of carrier wave center frequency point.Preferably, if use the bandwidth (perhaps for LTE, also referred to as 6, the center RB of carrier bandwidths) of carrier wave center frequency point 1.4MHz to send downlink reference signal, do not configure the transmission downlink reference signal in carrier wave in remaining bandwidth.

The subband size also can be configured by signaling in addition, the base station can be selected suitable subband as required flexibly like this, if for example the bandwidth ratio of carrier wave is larger, considers the performance of synchronous tracking, the base station can be with the subband band width configuration larger, and notify UE with configuration parameter.Preferably, if use the bandwidth (perhaps for LTE, also referred to as 6, the center RB of carrier bandwidths) of carrier wave center frequency point 1.4MHz to send downlink reference signal, do not configure the transmission downlink reference signal in carrier wave in remaining bandwidth.

Specifically be mapped as in a pair of RB in the subframe of downlink reference signal in carrier wave: be arranged in last OFDM symbol of first time slot of subframe, as shown in Figure 3; Or first time slot penultimate OFDM symbol, as shown in Figure 4; Perhaps second first OFDM symbol of time slot, as shown in Figure 5; Perhaps second OFDM symbol of second time slot, as shown in Figure 6; Perhaps be positioned at last OFDM symbol of first time slot and second first OFDM symbol of time slot, as shown in Figure 7; Perhaps be positioned at the 4th OFDM symbol of first time slot and the 4th OFDM symbol of second time slot, as shown in Figure 8; Perhaps be positioned at the 5th OFDM symbol of first time slot and the 1st OFDM symbol of second time slot, as shown in Figure 9; Perhaps be positioned at the 4th OFDM symbol of first time slot and the 2nd OFDM symbol of second time slot, as shown in figure 10.Further during two OFDM symbols in descending reference signal is mapped to a subframe, the reference signal position between two OFDM symbols intersects.

Downlink reference signal specifically is mapped as in a pair of RB in PDSCH territory or subframe: be arranged in the 3rd OFDM symbol of inverse of first time slot of subframe and second time slot first, five OFDM symbols, perhaps the 3rd OFDM symbol of the inverse of first time slot and second time slot second, six OFDM symbols, perhaps the 3rd OFDM symbol of the inverse of first time slot and second time slot the 3rd, seven OFDM symbols, perhaps the 3rd OFDM symbol of the inverse of first time slot and second time slot second, seven OFDM symbols.

the sequence of the downlink reference signal of the present embodiment generates can adopt following manner: (bandwidth or amount of bandwidth are all to use corresponding RB number to describe usually in LTE according to the bandwidth of maximum carrier wave in system, also to use the RB number to calculate during the sequence of calculation) sequence of generation downlink reference signal (for example supports 6 kinds of bandwidth in the LTE system, respectively wherein 1.4MHz, 2.5MHz, 5MHz, 10MHz, 15MHz and 20MHz, be exactly so no matter be all to calculate with RB number corresponding to 20MHz bandwidth when calculating the sequence of that a kind of bandwidth), then come sequence corresponding to the described partial continuous bandwidth of intercepting from the sequence that maximum carrier bandwidths is calculated according to the size (also can be described as RB number corresponding to partial continuous bandwidth) of aforesaid partial continuous bandwidth, mapping sends in described partial continuous bandwidth.

When sending, downlink reference signal subframe can be divided into the n group in subframe, n is the integer more than or equal to 1, for example, the n value is 1 to 10, then the base station is put different downlink reference signal transmitted powers according to grouping information for each assembly and is sent downlink reference signal, can make the power quadrature of downlink reference signal each other like this when two nodes send downlink reference signal in same carrier wave, thereby avoid interference.For example 10 subframes are divided into 2 groups, be divided into one group as #0, #1, #2, #4 and #5, #6, #7, #8, #9 and #10 are divided into one group, each group can configure independently transmitted power, for example first group of power is A, second group of power is 0.5*A, base station 1 uses power A to send downlink reference signal in the subframe of first group like this, use power 0.5*A to send downlink reference signal in the subframe of second group, and neighbor base station uses power 0.5*A to send downlink reference signal in the subframe of first group, uses power A to send downlink reference signal in the subframe of second group.Adjacent base station uses different power to send downlink reference signal at same group like this, so for for the HetNet of CA, can to a certain degree suppress to disturb.

The mapping pattern 8 kind different patterns as above-mentioned Fig. 3-10 as shown in of downlink reference signal in the RB of whole bandwidth of carrier wave or partial continuous bandwidth.During for 3 OFDM symbols transmission downlink reference signals of use in a subframe, the 4 kind different patterns of mapping pattern as shown in Figure 11-14 in preferred RB.

A sub-bandwidth of configuration (subband) is transmitted downlink reference signal or CRS in carrier wave, does not configure CRS except subband in remaining bandwidth, and is as shown in Figure 15 in schematic diagram.For the bandwidth carrier wave that is 10MHz, wherein, the bandwidth of 10MHz can be divided into a plurality of subbands, for example respectively expand to the left and right 0.7MHz in the center frequency point of 10MHz, be exactly the 1.4MHz of centre frequency of 10MHz or 6 RB of 10MHz bandwidth center (corresponding 6 RB of 1.4MHz in LTE) so, the subband schematic diagram in carrier wave as shown in figure 15.

Above-mentioned downlink reference signal sends to include and adopts the subband mode to send in carrier wave, also has cycle of downlink reference signal to be set to the fixed cycle, and this cycle value is greater than 1ms.The below provides the pattern that dual mode is combined with, and as shown in figure 25, it is that in the employing carrier wave, the part continuous bandwidth is the downlink reference signal send mode of 2ms with the configuration transmission cycle.Both can economize on resources at frequency domain, also can economize on resources in time domain.

The downlink reference signal of the present embodiment is a brand-new reference signal, and it can use the sequence generating mode identical with CRS in LTE R10 to generate.

When sending downlink reference signal, can use a fixing transmitted power to send, also can be according to the actual environment of network, select different transmitted powers in different subframes, based on this, above-mentioned time-domain position and frequency domain interval transmission downlink reference signal according to determining comprises: the transmitted power of downlink reference signal in the subframe that sends the subframe of downlink reference signal and determine definite according to configuration information; At the time-domain position of the subframe of determining, send downlink reference signal with frequency domain interval and definite transmitted power.

The present embodiment also provides a kind of collocation method of downlink reference signal, the collocation method flow chart of downlink reference signal as shown in figure 16, and the method comprises the following steps (step S162-step S164):

Step S162, in a subframe of carrier wave, the time-domain position of mode configurating downlink reference signal (for example CRS) according to the rules, wherein the mode of regulation comprises one of following:

1) be one or more orthogonal frequency division multiplex OFDM symbols of the CRS position that is arranged in the PDSCH zone;

2) for being arranged in an OFDM symbol in PDSCH zone;

3) be an OFDM symbol of the CRS position that is arranged in the PDCCH zone;

4) for being positioned at an OFDM symbol in PDCCH zone;

Step S164, the frequency domain interval of the above-mentioned downlink reference signal of configuration is for specifying a RE (being for example 6 RE).

By above-mentioned four kinds of modes, the time-domain position of the downlink reference signal of above-mentioned configuration can be for one of following:

Third from the bottom OFDM symbol of first time slot in above-mentioned subframe, second first OFDM symbol of time slot selected one or more OFDM symbols in third from the bottom OFDM symbol of second time slot;

Last OFDM symbol of first time slot in above-mentioned subframe;

First time slot penultimate OFDM symbol in above-mentioned subframe;

Second first OFDM symbol of time slot in above-mentioned subframe;

Second OFDM symbol of second time slot in above-mentioned subframe;

Last OFDM symbol of first time slot and second first OFDM symbol of time slot in above-mentioned subframe;

Third from the bottom OFDM symbol of first time slot and the 4th OFDM symbol of second time slot in above-mentioned subframe;

Third from the bottom OFDM symbol of first time slot and second first OFDM symbol of time slot in above-mentioned subframe;

Third from the bottom OFDM symbol of first time slot and second OFDM symbol of second time slot in above-mentioned subframe;

First and the 5th OFDM symbol of third from the bottom OFDM symbol of first time slot and second time slot in above-mentioned subframe;

Third from the bottom OFDM symbol of first time slot and second and the 6th OFDM symbol of second time slot in above-mentioned subframe;

Third from the bottom OFDM symbol of first time slot and the 3rd and the 7th OFDM symbol of second time slot in above-mentioned subframe;

Third from the bottom OFDM symbol of first time slot and second and the 7th OFDM symbol of second time slot in above-mentioned subframe.

The time-domain position of the downlink reference signal that configures in the collocation method by above-mentioned downlink reference signal, can make downlink reference signal take less resource overhead, the configuration mode of this reference signal can make UE carry out the synchronous of carrier wave and follow the tracks of according to this downlink reference signal, solve the synchronous and incomplete problem of follow-up mechanism of carrier wave, improved the utilance of carrier wave.

Based on the sending method of above-mentioned downlink reference signal, the present embodiment also provides a kind of dispensing device of downlink reference signal, and this device can be arranged in the network equipments such as base station.The structured flowchart of the dispensing device of downlink reference signal as shown in figure 17, this device comprises: time-domain position determination module 172, frequency domain interval determination module 174 and sending module 176.The functional description of modules is as follows.

Time-domain position determination module 172 is used for a subframe at carrier wave, one of in such a way determines to send the time-domain position of downlink reference signal:

1, be one or more OFDM symbols of the CRS position that is arranged in Physical Downlink Shared Channel PDSCH zone; For example: one or more OFDM symbols in third from the bottom OFDM symbol of second time slot in second first OFDM symbol of time slot and above-mentioned subframe in third from the bottom OFDM symbol of first time slot, above-mentioned subframe in above-mentioned subframe.

2, for being arranged in an OFDM symbol in PDSCH zone;

3, be an OFDM symbol of the CRS position that is arranged in the PDCCH zone;

4, for being positioned at an OFDM symbol in PDCCH zone;

Frequency domain interval determination module 174 is connected to time-domain position determination module 172, is used for the frequency domain interval of the definite downlink reference signal of definite time-domain position determination module 172 for specifying a RE;

Sending module 176 is connected to frequency domain interval determination module 174, and the time-domain position and the definite frequency domain interval of frequency domain interval determination module 174 that are used for determining according to time-domain position determination module 172 send downlink reference signal.

The dispensing device of the downlink reference signal in the present embodiment sends in the process of downlink reference signal, can adopt aforesaid way to realize, for example: 1) downlink reference signal can send according to cycle interval time of setting, and was preferably 2 milliseconds, 3 milliseconds, 4 milliseconds or 5 milliseconds the interval time of this setting; 2) the initial subframe of transmission downlink reference signal is the 2nd work song frame (being the #2 subframe) or the 3rd work song frame (being the #3 subframe) in carrier wave.3) select frequency domain that downlink reference signal uses to be the partial continuous bandwidth of the appointment of carrier wave, as, be positioned at the fixed-bandwidth (1.4Mhz) of the center frequency point of carrier wave or fixing RB (6 RB).

The time-domain position that above-mentioned four kinds of modes are determined is one of following: last the OFDM symbol that is arranged in first time slot of subframe; Or, be arranged in first time slot penultimate of subframe OFDM symbol; Or, be arranged in first OFDM symbol of second time slot of subframe; Or, be arranged in second OFDM symbol of second time slot of subframe; Or, be arranged in last OFDM symbol of first time slot of subframe and second first OFDM symbol of time slot; Or, be arranged in third from the bottom OFDM symbol of first time slot of subframe and the 4th OFDM symbol of second time slot; Or, be arranged in third from the bottom OFDM symbol of first time slot of subframe and second first OFDM symbol of time slot; Or, be arranged in third from the bottom OFDM symbol of first time slot of subframe and second OFDM symbol of second time slot; Or, be arranged in third from the bottom OFDM symbol of first time slot of subframe and second time slot first and the 5th OFDM symbol; Or, be arranged in third from the bottom OFDM symbol of first time slot of subframe and second and the 6th OFDM symbol of second time slot; Or, be arranged in third from the bottom OFDM symbol of first time slot of subframe and the 3rd and the 7th OFDM symbol of second time slot; Or, be arranged in third from the bottom OFDM symbol of first time slot of subframe and second and the 7th OFDM symbol of second time slot.

When sending downlink reference signal, can use a fixing transmitted power to send, also can be according to the actual environment of network, select different transmitted powers in different subframes, based on this, above-mentioned sending module 176 comprises: determining unit is used for determining to send the subframe of downlink reference signal and the transmitted power of the subframe downlink reference signal of determining according to configuration information; Transmitting element is used for the time-domain position in the subframe of determining, sends downlink reference signal with frequency domain interval and definite transmitted power.

Based on the collocation method of above-mentioned downlink reference signal, the present embodiment also provides a kind of inking device of downlink reference signal, and this device can be arranged in the network equipments such as base station.The structured flowchart of the inking device of downlink reference signal as shown in figure 18, this device comprises: time-domain position configuration module 182 and frequency domain interval configuration module 184.The functional description of modules is as follows.

Time-domain position configuration module 182 is used for a subframe at carrier wave, one of in such a way the time-domain position of configurating downlink reference signal: 1, be one or more orthogonal frequency division multiplex OFDM symbols of the CRS position that is arranged in the PDSCH zone; 2, for being arranged in an OFDM symbol in PDSCH zone; 3, be an OFDM symbol of the CRS position that is arranged in the PDCCH zone; 4, for being positioned at an OFDM symbol in PDCCH zone;

Frequency domain interval configuration module 184 is connected to time-domain position configuration module 182, is used for configuring the frequency domain interval of downlink reference signal of above-mentioned time-domain position configuration module 182 configurations for specifying a RE (for example 6 RE).

In this device, the time-domain position of time-domain position configuration module 182 configuration is one of following: last the OFDM symbol that is arranged in first time slot of subframe; Or, be arranged in first time slot penultimate of subframe OFDM symbol; Or, be arranged in first OFDM symbol of second time slot of subframe; Or, be arranged in second OFDM symbol of second time slot of subframe; Or, be arranged in last OFDM symbol of first time slot of subframe and second first OFDM symbol of time slot.

Transmission or configuration mode by above-mentioned downlink reference signal, can satisfy the scheme that solves the synchronous tracking of new carrier wave in all above-mentioned scenes on the basis of deleting the configurations such as CRS, be specially adapted in wireless communication system under multi-carrier aggregation scene the synchronous tracking of UE in carrier wave.And, comparing with existing reference signal, the downlink reference signal of the present embodiment has reduced resource overhead greatly.

Aforesaid way is applied to above-mentioned new carrier wave, is operated in like this UE in newly-increased carrier wave and just can utilizes CRS in subband to complete the tracking of synchronizeing with new carrier wave.And further the CRS in subband also can carry out mobility measurements for the UE of new carrier wave.

In prior art, CRS is that the full bandwidth configuration sends, and uses subband arrangement to send CRS in new carrier wave, has greatly reduced the transmission of CRS, is beneficial to base station energy-saving and economizes on resources.

Here can carry out certain Proportionality design between the big or small and bandwidth synchronously carrier wave of tracking of subband, so more can effectively promote the synchronous tracking accuracy of UE in carrier wave.When the carrier bandwidths that for example needs to follow the tracks of is 20MHz, if frequency range 1.4MHz centered by the subband of configuration transmission CRS, the effect of following the tracks of so, 1MHz with frequency range centered by the subband that will configure transmission CRS, perhaps with will configure frequency range 2MHz centered by the subband that sends CRS, in these 3 kinds of situations, UE is that slightly difference is arranged for the synchronous tracking effect of carrier wave.Can be by emulation, therefrom selection more reasonably configures the bandwidth of the subband of CRS.

For the LTE system, preferably use the subband of 1.4MHz to send the subband of CRS as the configuration of all bandwidth (have 6 kinds of bandwidth in LTE and be respectively 1.4MHz, 2.5MHz, 5MHz, 10MHz, 15MHz and 20MHz) carrier wave.So if the bandwidth of new carrier wave is one of above-mentioned 6 kinds of bandwidth, can configure so the subband that sends CRS is 1.4MHz, the remaining bandwidth resource does not configure CRS.Here selecting 1.4MHz is for ease of realizing, because the correlation computations of the CRS of 1.4MHz can adopt the technology of existing protocol to carry out fully.For example calculating c _InitValue the time, the formula below using, parameter is wherein all used the parameter of new carrier wave.Here replenish, if new carrier wave does not have oneself independently virtual subdistrict ID, the embodiment of the present invention is also further stipulated the physical district ID of the compatible carrier wave of use and new carrier wave pairing so.

$c_{\mathrm{init}}=2^{10}\·(7\·(n_s+1)+l+1)\·(2\·N_{\mathrm{ID}}^{\mathrm{cell}}+1)+2\·N_{\mathrm{ID}}^{\mathrm{cell}}+N_{\mathrm{CP}},$

N wherein _sThe time slot index, l is-symbol index,

Physical district ID, N _CPThe constant relevant to the CP type,

$N_{\mathrm{CP}}=\left\{\begin{array}{cc}1& \mathrm{for\; <figure-callout\; id="0"\; label="normal\; CP"\; filenames="HDA0000105303630000011.png,HDA0000105303630000021.png"\; state="\{\{state\}\}">normal\; CP</figure-callout>}\\ 0& \mathrm{for\; extended\; CP}\end{array}\right..$

Then, by above-mentioned c _InitCalculate further and calculate c (i) sequence according to the mode of LTE regulation (seeing 36.211a10 7.2 chapters and sections for details), the formula below then utilizing calculates

Reference sequences:

$r_{{l,n}_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\&CenterDot;c\left(2m\right))+\mathrm{<figure-callout\; id="1"\; label="j"\; filenames="HDA0000105303630000011.png,HDA0000105303630000021.png"\; state="\{\{state\}\}">j</figure-callout>}\frac{1}{\sqrt{2}}(1-2\&CenterDot;c(2m+1)),$ $m=\mathrm{0,1},...,{2N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1,$ Wherein here

Value is the bandwidth of subband.

After having determined sequence, shine upon in subband according to the mapping pattern of LTE regulation.

Secondly, can be according to the size of subband in the new carrier wave of proportional arrangement of agreement, preferred 20 (new carrier bandwidths) for example: the proportionality principle of 1.4 (bandwidth of configuration CRS in new carrier wave) or 10: 1.4 is determined new carrier bandwidths and is wherein configured the bandwidth of the subband of CRS.

Above-mentioned description has determined that the size of configuration CRS subband bandwidth in new carrier wave is determined mode, has further provided definite mode and the mapping of CRS sequence in the subband.

The below further sets forth, and the subband bandwidth in the embodiment of the present invention in new carrier wave can determine according to aforesaid way, and subband is also can be dispersed in the bandwidth of new carrier wave.The subband that is configuration CRS in new carrier wave is a plurality of frequency ranges that can be distributed according to certain pattern in new carrier wave.When for example sending CRS with the subband of 1.4MHz in the new carrier wave of 20MHz, the subband of 1.4MHz can be divided into 2 subbands, is distributed in respectively the two ends of the new carrier wave of 20MHz bandwidth, as schematically shown in Figure 19.Mapping and sequence are definite and above-mentioned, and 1.4MHz to be placed on new carrier wave frequency range center identical.Do like this advantage with certain frequency deviation estimation, because the mapping of CRS in new carrier wave is more even.

In addition for new carrier wave, if and the time difference of pairing between carrier wave is when larger, for example in the scene in background technology 3, when just arriving UE due to the forwarding of a plurality of RRH of carrier wave experience of new carrier wave or pairing, the time difference of such two carrier waves is very large, and at this moment, the present invention can be by configuring PSS/SSS in new carrier wave, help UE and complete and the synchronizeing of new carrier wave, then adopt above-mentioned subband mode to configure in new carrier wave to send CRS to realize the tracking of synchronizeing of UE and new carrier wave.

For UE, adopt PSS/SSS in the carrier wave with new carrier wave pairing to complete synchronize of UE and new carrier wave, then utilize the interior CRS that configures of subband in new carrier wave to realize the tracking of synchronizeing with new carrier wave.

It should be noted that the CRS in above-mentioned subband need to configure to send in the subframe of each new carrier wave.

The embodiment of the present invention also provides a kind of tracking of synchronizeing that realizes UE and new carrier wave by the variation mode to above-mentioned subband CRS.Specifically describe as follows.

Be to dispose CSI-RS in new carrier wave, still, the minimum period of the CSI-RS that stipulates in LTE at present is 5ms, and namely CSI-RS can appear one time in time direction 5 subframes of often being separated by, but the frequency direction wide mapping that is filled band.UE can not only use CSI-RS to carry out synchronous the tracking like this, and it is that every ms carries out once that present UE for connection status carries out synchronous the tracking.So because CSI-RS is too sparse at time orientation, can not realize synchronous tracking, so configure transmission CRS use in conjunction with the above-mentioned subband mode of using of the present invention in new carrier wave, just can make up the above-mentioned sparse problem of CSI-RS time orientation.

As the carrier wave schematic diagram of Figure 20, CSI-RS cycle according to 5ms in new carrier wave configures transmission in subframe, and CRS sends according to the subband mode in new carrier wave.Like this subframe of CSI-RS is being arranged, UE can utilize CSI-RS to do synchronous tracking, is not having the subframe of CSI-RS, UE to utilize the CRS of subband to do synchronous tracking.

Carrier wave schematic diagram as Figure 21, the CRS of configuration subband in new carrier wave, then in each subframe in agreement one or 2 s' OFDM symbol in the bandwidth of whole new carrier wave configuration send CRS, in each subframe, at least one OFDM being arranged like this is that whole bandwidth has CRS, UE uses the CRS in subband and at least one OFDM symbol to carry out the synchronous tracking of new carrier wave in each subframe like this, because the distribution of the CRS of frequency domain can be so that the tracking of frequency domain be more accurate.

By top mode, following method is also that the present invention proposes.Purport is to reduce the configuration of CRS in new carrier wave subframe, and in new carrier wave, UE gets final product with the tracer request of synchronizeing of new carrier wave but satisfy.

In each subframe of new carrier wave with one or at the most 3 OFDM symbols configure transmission CRS reference signal.For example, approximately fix on to configure with first OFDM symbol in the subframe of new carrier wave and send CRS, all the other OFDM symbols do not configure and send CRS.Perhaps, the position of the OFDM symbol that PDCCH territory in the subframe of LTE R10 regulation is corresponding configures according to the regulation of LTE R10 and sends the remaining OFDM symbol of CRS and do not configure and send CRS in new carrier wave subframe.Perhaps, the position of the OFDM symbol that PDSCH territory in the subframe of LTE R10 regulation is corresponding configures transmission CRS according to the regulation of LTE R10 in the subframe of new carrier wave, and remaining OFDM symbol does not configure and sends CRS.Above-mentioned mode is all carried out the CRS carrying take the OFDM symbol as unit.Compared with the prior art, reduced the OFDM number of symbols that in the subframe, CRS takies in said method, reduced the transmission of CRS, the resource of saving is used for carrying data, also can save the energy consumption of eating dishes without rice or wine of new carrier wave.

The below is a kind of method of synchronizeing tracking that PSS/SSS of use and CSI-RS solve UE and new carrier wave.Because the time domain period ratio of CSI-RS is larger, the minimum cycle is 5ms, can not satisfy so UE this moment and use CSI-RS to carry out the synchronous requirement of following the tracks of.A kind of method is described below, and at first the base station need to configure rational original position for CSI-RS, so that CSI-RS appears in the middle subframe of the subframe of PSS/SSS appearance.For example, the cycle of base station configuration CSI-RS is 5ms, and initial subframe is #2 or #3.Thus, PSS/SSS configuring condition and the numbering of subframe and the sub-frame configuration situation of each radio frames in conjunction with existing LTE R10 can obtain the structure as Figure 22 (initial subframe is #2).Like this, the resource of the operable synchronous tracking in base station is PSS, SSS and CSI-RS, and the cycle between these resources is 2 and 3 subframes, although be not that each subframe has, such period profile also can be done synchronous tracking for UE utilizes to a certain extent.For example UE synchronously follows the tracks of with PSS in subframe #0, uses CSI-RS synchronously to follow the tracks of in subframe #2, synchronously follows the tracks of with SSS in subframe #5, uses CSI-RS synchronously to follow the tracks of in subframe #7.It is also so to a certain degree the tracking of synchronizeing that can guarantee UE and new carrier wave.

The below is another kind of mode, in new carrier wave, the CRS transmission cycle is configured, carrier wave schematic diagram as Figure 23, be configured to 2ms, 3ms or 4ms etc. such as the CRS transmission cycle, like this CRS also can with CSI-RS between or and PSS, SSS between can adopt above-mentioned CSI-RS and PSS/SSS mode to synchronize the mechanism of tracking for the UE in new carrier wave provides.Configurable according to the cycle of CRS, can change drawing following centralized system for UE and new carrier synchronization tracking.

Cycle with CRS in new carrier wave is configured, and will strengthen in the cycle, for example is set to 2ms, and in so new carrier wave, the traffic volume of CRS can be half of the CRS traffic volume in existing LTE R10 carrier wave, and the resource of saving is used for sending data, and saves the energy consumption of eating dishes without rice or wine.

Cycle with CRS in new carrier wave is configured, to strengthen in the cycle, for example be set to 2ms, in so new carrier wave, the traffic volume of CRS can be half of the CRS traffic volume in existing LTE R10 carrier wave, on this basis, further can in conjunction with the CRS of subband or arrange 1 or at the most the mode of 3 OFDM symbols be used in conjunction with, like this with existing LTE R10 carrier wave in the CRS configuration relatively, the resource of saving is used for sending data, and saves the energy consumption of eating dishes without rice or wine.

Cycle with CRS in new carrier wave is configured, to strengthen in the cycle, for example be set to 2ms, in so new carrier wave, the traffic volume of CRS can be half of the CRS traffic volume in existing LTE R10 carrier wave, be used in conjunction with CSI-RS, CSI-RS cycle 5ms for example, initial subframe is #2, the CRS cycle is 2 so, and initial subframe is #0.Like this with existing LTE R10 carrier wave in CRS configuration relatively, the resource of saving is used for sending data, and saves the energy consumption of eating dishes without rice or wine.

The transmitted power of CRS can be configured to a plurality of grades in new carrier wave, distribute according to different grades, for example be configured to 2 grades, the transmitted power with the CRS of existing LTE R10 is identical, the transmitted power of a kind of CRS than LTE R10 is little, is for example its 0.5 times.Configure with the CRS cycle like this and be combined with, low power CRS can reduce by two nodes and send interference between CRS power in same carrier waves under the HetNet of multicarrier.For example, as the carrier wave schematic diagram of Figure 24, CRS configuration cycle is 2ms, grade is that 2 grades are respectively 0 grade and 1 grade, for example configure CRS in subframe #0, #2, #4, #6 and #8 in a certain radio frames, and 2 grades is used alternatingly, wherein the CRS in #0, #4 and #8 is 0 grade, #2.CRS in #6 is 1 grade.

The above-mentioned computational methods according to OFDM symbols carry CRS, CSI-RS still adopt the mode of stipulating in LTE R10 to calculate.

As can be seen from the above description, above-described embodiment is by the time-domain position to downlink reference signal configuration or the downlink reference signal determined, can make downlink reference signal take less resource overhead, the UE that can make of this reference signal carries out the synchronous of carrier wave and follows the tracks of according to this downlink reference signal, solve the synchronous and incomplete problem of follow-up mechanism of carrier wave, improved the utilance of carrier wave.To solve the synchronous tracking of UE in carrier wave.And, comparing with existing reference signal, the downlink reference signal of the present embodiment has reduced resource overhead greatly.

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

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

Claims (18)

1. the sending method of a downlink reference signal is characterized in that comprising:

In a subframe of carrier wave, one of in such a way determine to send the time-domain position of downlink reference signal:

One or more orthogonal frequency division multiplex OFDM symbols for the cell special reference CRS position that is arranged in Physical Downlink Shared Channel PDSCH zone;

For being arranged in an OFDM symbol in PDSCH zone;

An OFDM symbol for the CRS position that is arranged in the physical downlink control channel PDCCH zone;

For being positioned at an OFDM symbol in PDCCH zone;

Determine that the frequency domain interval of described downlink reference signal is for specifying a Resource Unit RE;

Send described downlink reference signal according to the described time-domain position of determining and described frequency domain interval.

2. method according to claim 1, is characterized in that, one or more OFDM symbols of the CRS position in the described PDSCH of being arranged in zone comprise:

One or more OFDM symbols in third from the bottom OFDM symbol of second time slot in second first OFDM symbol of time slot and described subframe in third from the bottom OFDM symbol of first time slot, described subframe in described subframe.

3. method according to claim 1, is characterized in that, described downlink reference signal sent according to cycle interval time of setting.

4. method according to claim 3, is characterized in that, be 1 millisecond, 2 milliseconds, 3 milliseconds, 4 milliseconds or 5 milliseconds the interval time of described setting.

5. method according to claim 1, is characterized in that, the initial subframe that sends described downlink reference signal is the 2nd work song frame or the 3rd work song frame in described carrier wave.

6. method according to claim 1, is characterized in that, sends described downlink reference signal according to the described time-domain position of determining and described frequency domain interval and comprise:

The frequency domain of selecting described downlink reference signal to use is the partial continuous bandwidth of the appointment of described carrier wave; Wherein, the partial continuous bandwidth of described appointment is that one or more subbands of described carrier wave are wide.

7. method according to claim 6, is characterized in that, the partial continuous bandwidth of the partial continuous bandwidth appointment of described appointment is fixed-bandwidth or the fixed resource piece RB that is positioned at the center frequency point of described carrier wave.

8. method according to claim 6, is characterized in that, the partial continuous bandwidth 1.4Mhz of described appointment or 6 RB.

9. method according to claim 1, is characterized in that, sends described downlink reference signal according to the described time-domain position of determining and described frequency domain interval and comprise:

Determine according to the parameter that sets in advance the frequency domain bandwidth that described downlink reference signal uses.

10. method according to claim 1, is characterized in that, described definite described time-domain position is one of following:

Be arranged in last OFDM symbol of described first time slot of subframe;

Be arranged in first time slot penultimate of described subframe OFDM symbol;

Be arranged in first OFDM symbol of second time slot of described subframe;

Be arranged in second OFDM symbol of second time slot of described subframe;

Be arranged in last OFDM symbol of first time slot of described subframe and second first OFDM symbol of time slot;

Be arranged in third from the bottom OFDM symbol of first time slot of described subframe and the 4th OFDM symbol of second time slot;

Be arranged in third from the bottom OFDM symbol of first time slot of described subframe and second first OFDM symbol of time slot;

Be arranged in third from the bottom OFDM symbol of first time slot of described subframe and second OFDM symbol of second time slot;

Be arranged in third from the bottom OFDM symbol of first time slot of described subframe and second time slot first and the 5th OFDM symbol;

Be arranged in third from the bottom OFDM symbol of first time slot of described subframe and second and the 6th OFDM symbol of second time slot;

Be arranged in third from the bottom OFDM symbol of first time slot of described subframe and the 3rd and the 7th OFDM symbol of second time slot;

Be arranged in third from the bottom OFDM symbol of first time slot of described subframe and second and the 7th OFDM symbol of second time slot.

11. method according to claim 1 is characterized in that, described downlink reference signal uses the sequence generating mode identical with CRS in long evolving system version 10 to generate, and intercepts the corresponding sequence of subband according to the amount of bandwidth of subband from the sequence that generates.

12. method according to claim 1 is characterized in that, sends described downlink reference signal according to the described time-domain position of determining and described frequency domain interval and comprises:

The subframe of the described downlink reference signal of carrying is divided into the n group, and wherein, n is the integer more than or equal to 1; Determine to send the subframe of described downlink reference signal and the transmitted power of downlink reference signal described in the described subframe of determining according to grouping information and power configuration information.

13. according to claim 1-12 described methods of any one is characterized in that, a described appointment RE is 6 RE.

14. the collocation method of a downlink reference signal is characterized in that comprising:

In a subframe of carrier wave, the time-domain position of configurating downlink reference signal one of in such a way:

One or more orthogonal frequency division multiplex OFDM symbols for the cell special reference CRS position that is arranged in Physical Downlink Shared Channel PDSCH zone;

For being arranged in an OFDM symbol in PDSCH zone;

An OFDM symbol for the CRS position that is arranged in the physical downlink control channel PDCCH zone;

For being positioned at an OFDM symbol in PDCCH zone;

Configure the frequency domain interval of described downlink reference signal for specifying a Resource Unit RE.

15. method according to claim 14 is characterized in that, the time-domain position of the described downlink reference signal of configuration is one of following:

Third from the bottom OFDM symbol of first time slot in described subframe, second first OFDM symbol of time slot selected one or more OFDM symbols in third from the bottom OFDM symbol of second time slot;

Last OFDM symbol of first time slot in described subframe;

First time slot penultimate OFDM symbol in described subframe;

Second first OFDM symbol of time slot in described subframe;

Second OFDM symbol of second time slot in described subframe;

Last OFDM symbol of first time slot and second first OFDM symbol of time slot in described subframe;

Third from the bottom OFDM symbol of first time slot and the 4th OFDM symbol of second time slot in described subframe;

Third from the bottom OFDM symbol of first time slot and second first OFDM symbol of time slot in described subframe;

Third from the bottom OFDM symbol of first time slot and second OFDM symbol of second time slot in described subframe;

First and the 5th OFDM symbol of third from the bottom OFDM symbol of first time slot and second time slot in described subframe;

Third from the bottom OFDM symbol of first time slot and second and the 6th OFDM symbol of second time slot in described subframe;

Third from the bottom OFDM symbol of first time slot and the 3rd and the 7th OFDM symbol of second time slot in described subframe;

Third from the bottom OFDM symbol of first time slot and second and the 7th OFDM symbol of second time slot in described subframe.

16. according to claim 14 or 15 described methods is characterized in that, a described appointment RE is 6 RE.

17. the dispensing device of a downlink reference signal is characterized in that comprising:

The time-domain position determination module is used for a subframe at carrier wave, one of in such a way determines to send the time-domain position of downlink reference signal:

One or more orthogonal frequency division multiplex OFDM symbols for the cell special reference CRS position that is arranged in Physical Downlink Shared Channel PDSCH zone;

For being arranged in an OFDM symbol in PDSCH zone;

An OFDM symbol for the CRS position that is arranged in the physical downlink control channel PDCCH zone;

For being positioned at an OFDM symbol in PDCCH zone;

The frequency domain interval determination module is used for the frequency domain interval of the definite described downlink reference signal of definite described time-domain position determination module for specifying a Resource Unit RE;

Sending module, the described time-domain position and the definite described frequency domain interval of described frequency domain interval determination module that are used for determining according to described time-domain position determination module send described downlink reference signal.

18. the inking device of a downlink reference signal is characterized in that comprising:

The time-domain position configuration module is used for a subframe at carrier wave, one of in such a way the time-domain position of configurating downlink reference signal:

One or more orthogonal frequency division multiplex OFDM symbols for the cell special reference CRS position that is arranged in Physical Downlink Shared Channel PDSCH zone;

For being arranged in an OFDM symbol in PDSCH zone;

An OFDM symbol for the CRS position that is arranged in the physical downlink control channel PDCCH zone;

For being positioned at an OFDM symbol in PDCCH zone;

The frequency domain interval configuration module is used for configuring the frequency domain interval of described downlink reference signal of described time-domain position configuration module configuration for specifying a Resource Unit RE.

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