CN103944662A - Method and system for transmitting uplink demodulation reference signal - Google Patents
Method and system for transmitting uplink demodulation reference signal Download PDFInfo
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- CN103944662A CN103944662A CN201310018556.9A CN201310018556A CN103944662A CN 103944662 A CN103944662 A CN 103944662A CN 201310018556 A CN201310018556 A CN 201310018556A CN 103944662 A CN103944662 A CN 103944662A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0052—Realisations of complexity reduction techniques, e.g. pipelining or use of look-up tables
- H04L1/0053—Realisations of complexity reduction techniques, e.g. pipelining or use of look-up tables specially adapted for power saving
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Abstract
The invention provides a method and a system for transmitting an uplink demodulation reference signal (DMRS). The method comprises the steps of acquiring a transmitting position of the uplink DMRS, and determining an OCC (orthogonal covering code) relevant to the uplink DMRS according to network-side OCC indicating information; and transmitting the uplink DMRS according to the transmitting position and the OCC.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of method and system of launching uplink demodulation reference signal.
Background technology
Along with popularizing of mobile Internet and smart mobile phone, Mobile data traffic demand rapidly increases.Future Ten is in year, and mobile data services amount also will be doubled every year, within 10 years, will increase by 1,000 times.In carrier network, data service ratio increases gradually, has affected conventional telecommunications level business, and still, because data service is according to charge on traffic, its profit growth rate and flow load are not directly proportional.In addition, the data service of rapid growth has proposed severe challenge to the transmittability of mobile communications network.Most mobile data services mainly occur in small-cell (comprising indoor and focus environment), are embodied as nomadic/local wireless access scene.According to statistics, at present the overwhelming majority of mobile data services amount occurs in small-cell, and this ratio also will continue growth, and therefore, operator is in the urgent need to the data service solution of the small-cell covering of two-forty.
As shown in Figure 1, be the schematic diagram of the method for existing transmitting uplink demodulation reference signal (Demodulation ReferenceSignal, be called for short DMRS).
At Long Term Evolution (Long Term Evolution, abbreviation LTE) in system, with normal cyclic prefix (Cyclic Prefix, abbreviation CP) length is example, each sub-frame of uplink comprises two up DMRS transmitting sites, the 4th within the scope of each subframe and the 11st OFDM (Orthogonal Frequency Division Multiplexing is called for short OFDM) symbol specifically; Within the scope of subframe, the final demodulated reference signal sequence of the 4th OFDM character position is that length is the product of the 1st complex values of 2 OCC code and the initial DMRS sequence of relevant position, and within the scope of subframe, the final DMRS sequence of the 11st OFDM character position is that length is the product of the 2nd complex values of 2 OCC code and the initial DMRS sequence of relevant position.
The data service covering for current small-cell, its feature comprises: user is generally fixing user or with user that very low speed moves, user is less demanding to mobility, has wireless channel delay expansion less, and wireless channel environment changes slower feature; In addition, data service is mainly internet protocol-based (Internet Procotol is called for short IP) Internet service, relatively traditional carrier class business, and most of Internet service is less demanding to transmission delay, but having relatively high expectations to data rate.After introducing LTE technology, because LTE system is mainly used in large coverage (500 meters to 100 kms) and multiple channel, (speed can be from 3,000 ms/h to 350,000 ms/h, channel latency is from being no more than a microsecond to tens microseconds) environment, the applied environment of the data service covering with existing small-cell is incompatible, therefore, when its carrying high data rate IP data packet traffic, if still continue to use the up DMRS launching technique of existing LTE system, can bring the expense of DMRS excessive, efficiency is on the low side, the problem of high cost.
The up DMRS launching technique of existing LTE system is that each time slot or subframe need to send up DMRS signal, thereby has caused the up DMRS expense of small-cell overlay environment excessive, and efficiency is on the low side, the problem of high cost.Therefore, under the overlay environment of high data rate small-cell, manage to reduce up DMRS expense, capacity, is still the demand that needs solution.
Summary of the invention
The invention provides a kind of method and system of launching up DMRS signal, the technical problem that solve is how to reduce up DMRS signal overhead.
For solving the problems of the technologies described above, the invention provides following technical scheme:
A method of launching uplink demodulation reference signal DMRS, comprising:
Obtain up DMRS signal transmitting site, and, according to the orthogonal covering codes OCC indication information of network side, determine the OCC code relevant with up DMRS signal;
According to described transmitting site and OCC code, launch up DMRS signal.
Preferably, described method also has following features: described up DMRS signal transmitting site is at least one orthogonal frequency division multiplex OFDM symbol within the scope of window launch time; Wherein:
Launch time, window was the continuous sub-frame of uplink that network side is distributed to user's side.
Preferably, described method also has following features: described up DMRS signal transmitting site is contained at least one subframe within the scope of window launch time.
Preferably, described method also has following features: described up DMRS signal transmitting site is to determine according to the transmitting site indication information of network side.
Preferably, described method also has following features: described transmitting site indication information comprises subframe position indication information and OFDM character position indication information; Wherein:
Subframe position indication information is indicated the subframe that comprises up DMRS within the scope of window launch time;
The OFDM symbol of the up DMRS signal of actual bearer within the scope of the subframe that the indication of OFDM character position indication information comprises up DMRS signal.
Preferably, described method also has following features: described subframe position indication information bit number equals window size launch time, and whether the corresponding subframe of each bit indication within the scope of launch time window comprises up DMRS signal; Wherein:
Launch time, window size was distributed to the continuous sub-frame of uplink number of user's side for network side.
Preferably, described method also has following features: described OFDM character position indication information bit number equals the OFDM symbolic number in subframe, and whether the corresponding OFDM symbol within the scope of each bit indication subframe carries up DMRS signal.
Preferably, described method also has following features: described OCC code is that sequence length equals in one group of mutually orthogonal complex values sequence of transmitting site number; Wherein:
Transmitting site number is the OFDM symbolic number of carrying DMRS signal within the scope of window launch time.
Preferably, described method also has following features: described network side OCC indication information indicator sequence length equals a complex values sequence in one group of mutually orthogonal complex values sequence of transmitting site number.
Preferably, described method also has following features: the bit number of described network side OCC indication information is Ceil (log
2(N)), complex values sequence of numeric representation of each OCC indication information; Wherein, N is that sequence length equals the complex values sequence number that one group of mutually orthogonal complex values sequence of transmitting site number comprises, Ceil represents to round up.
Preferably, described method also has following features: described according to described transmitting site and OCC code, launch up DMRS signal, and comprising:
According to described transmitting site, obtain a DMRS sequence of each transmitting site, wherein, sequence length equals the continuous sub-carrier number that network side is distributed to user's side;
By described length, be transmitting site number OCC code each complex values and each transmitting site the one DMRS sequence is corresponding multiplies each other, to obtain the 2nd DMRS sequence of each transmitting site;
The 2nd DMRS sequence mapping of each transmitting site is arrived to described transmitting site, and transmitting.
A system of launching uplink demodulation reference signal DMRS, comprising:
Acquisition device, for obtaining up DMRS signal transmitting site, and, according to the orthogonal covering codes OCC indication information of network side, determine the OCC code relevant with up DMRS signal;
Emitter, for according to described transmitting site and OCC code, launches up DMRS signal.
Preferably, described system also has following features: described up DMRS signal transmitting site is at least one orthogonal frequency division multiplex OFDM symbol within the scope of window launch time; Wherein:
Launch time, window was the continuous sub-frame of uplink that network side is distributed to user's side.
Preferably, described system also has following features: described up DMRS signal transmitting site is contained at least one subframe within the scope of window launch time.
Preferably, described system also has following features: described up DMRS signal transmitting site is to determine according to the transmitting site indication information of network side.
Preferably, described system also has following features: described transmitting site indication information comprises subframe position indication information and OFDM character position indication information; Wherein:
Subframe position indication information is indicated the subframe that comprises up DMRS within the scope of window launch time;
The OFDM symbol of the up DMRS signal of actual bearer within the scope of the subframe that the indication of OFDM character position indication information comprises up DMRS signal.
Preferably, described system also has following features: described subframe position indication information bit number equals window size launch time, and whether the corresponding subframe of each bit indication within the scope of launch time window comprises up DMRS signal; Wherein:
Launch time, window size was distributed to the continuous sub-frame of uplink number of user's side for network side.
Preferably, described system also has following features: described OFDM character position indication information bit number equals the OFDM symbolic number in subframe, and whether the corresponding OFDM symbol within the scope of each bit indication subframe carries up DMRS signal.
Preferably, described system also has following features: described OCC code is that sequence length equals in one group of mutually orthogonal complex values sequence of transmitting site number; Wherein:
Transmitting site number is the OFDM symbolic number of carrying DMRS signal within the scope of window launch time.
Preferably, described system also has following features: described network side OCC indication information indicator sequence length equals a complex values sequence in one group of mutually orthogonal complex values sequence of transmitting site number.
Preferably, described system also has following features: the bit number of described network side OCC indication information is Ceil (log
2(N)), complex values sequence of numeric representation of each OCC indication information; Wherein, N is that sequence length equals the complex values sequence number that one group of mutually orthogonal complex values sequence of transmitting site number comprises, Ceil represents to round up.
Preferably, described system also has following features: described emitter comprises:
Acquisition module, for according to described transmitting site, obtains a DMRS sequence of each transmitting site, and wherein, sequence length equals the continuous sub-carrier number that network side is distributed to user's side;
Computing module, is connected with described acquisition module, for by described length, be transmitting site number OCC code each complex values and each transmitting site the one DMRS sequence is corresponding multiplies each other, to obtain the 2nd DMRS sequence of each transmitting site;
Transmitter module, is connected with described computing module, for the 2nd DMRS sequence mapping of each transmitting site is arrived to described transmitting site, and transmitting.
Embodiment provided by the invention, under the scene of disposing in the covering of data service small-cell for prior art, up DMRS expense is excessive, efficiency is on the low side, the problem of high cost, according to transmitting site and OCC code, launch up DMRS signal, reach the expense that reduces up DMRS signal, and promoted the effect that up small-cell covers capacity.
Accompanying drawing explanation
Fig. 1 launches the schematic diagram of up DMRS method in prior art;
Fig. 2 is the flow chart of the embodiment of the method for the up DMRS of transmitting provided by the invention;
The schematic diagram of the up DMRS method of transmitting that Fig. 3 provides for the embodiment of the present invention one;
The schematic diagram of the up DMRS method of transmitting that Fig. 4 provides for the embodiment of the present invention two;
The schematic diagram of the up DMRS method of transmitting that Fig. 5 provides for the embodiment of the present invention three;
Fig. 6 is the structure chart of the system embodiment of the up DMRS of transmitting provided by the invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.It should be noted that, in the situation that not conflicting, the embodiment in the application and the feature in embodiment be combination in any mutually.
Fig. 2 is the flow chart of the embodiment of the method for the up DMRS of transmitting provided by the invention.Embodiment of the method shown in Fig. 2, comprising:
Step 201, obtain up DMRS signal transmitting site, and, according to the orthogonal covering codes OCC indication information of network side, determine the OCC code relevant with up DMRS signal;
Step 202, according to described transmitting site and OCC code, launch up DMRS signal.
Embodiment of the method provided by the invention, excessive for prior art up DMRS expense under data service small-cell covering deployment scenario, efficiency is on the low side, the problem of high cost, according to transmitting site and OCC code, launch up DMRS signal, reach the expense that reduces up DMRS signal, and promoted the effect that up small-cell covers capacity.
Below embodiment of the method provided by the invention is described further:
The present invention describes with following application scenarios, this application scenarios comprises at least 1 base station (network equipment, as eNode B) and at least 1 travelling carriage (user side equipment, as UE), wherein, base station has at least 1 travelling carriage and sends control information and user data, receive control information that at least 1 travelling carriage sends and the function of user data.
Embodiment mono-:
As shown in Figure 3, be the schematic diagram of the up DMRS method of transmitting of embodiment mono-; Wherein, twill represents up DMRS transmitting site, and non-twill represents upstream data transmitting site.
Suppose normal CP length, and launch time, window was subframe 1 and subframe 2.
Wherein, described launch time, window referred to that network side distributes to the continuous subframe of user's side.
The transmitting site of up DMRS signal can be determined by two kinds of modes, comprise:
Network side and user consult up DMRS signal transmitting site in advance, and each user, when obtaining transmitting site, can directly determine according to the result consulting; Or,
According to the transmitting site indication information of network side, determine up DMRS signal transmitting site.
Wherein, described transmitting site is at least one the OFDM symbol within the scope of window launch time; Therefore the transmitting site of determining up DMRS signal is equivalent to determines the subframe that comprises up DMRS signal within the scope of window in launch time, and within the scope of the subframe that comprises up DMRS signal the OFDM symbol of the up DMRS signal of actual bearer.
Wherein, described transmitting site indication information comprises: subframe position indication information and OFDM character position indication information.Wherein:
Subframe position indication information is indicated the subframe that comprises DMRS signal within the scope of window launch time; Its bit number equals window size launch time, and whether the corresponding subframe of each bit indication within the scope of launch time window comprises up DMRS signal; Wherein, launch time, window size was distributed to the continuous sub-frame of uplink number of user's side for network side.In the present embodiment, subframe position indication information is to carry by 2 bits, the corresponding subframe of each bit, concrete value is " 11 ", wherein, bit is set to " 1 ", represent that corresponding subframe comprises up DMRS signal, otherwise, represent that corresponding subframe does not comprise up DMRS signal, that is, subframe 1 all comprises up DMRS signal with subframe 2.
The OFDM symbol of the up DMRS signal of actual bearer within the scope of the subframe that the indication of OFDM character position indication information comprises up DMRS signal; Its bit number equals the OFDM symbolic number in subframe, and whether the corresponding OFDM symbol within the scope of the subframe that each bit indication comprises up DMRS signal carries up DMRS signal.In the present embodiment, OFDM character position indication information comprises 14 bits, the corresponding OFDM symbol of each bit, concrete value is " 00000010000000 ", and wherein, bit is set to " 1 ", represent the up DMRS signal of corresponding OFDM symbols carry, otherwise represent that corresponding OFDM symbol does not carry up DMRS signal, that is, subframe 1 is used to carry up DMRS signal with the 7th OFDM symbol in subframe 2.
Wherein, the transmitting site indication information of described network side can be carried in the proprietary downlink physical control signal of user or the proprietary downlink system message of user.
In the present embodiment, determine that transmitting site is the 7th OFDM symbol of each subframe.
According to network side OCC indication information, determine the OCC code relevant with up DMRS signal.
Wherein, described OCC code is that sequence length equals in one group of mutually orthogonal complex values sequence of transmitting site number, and wherein, transmitting site number is the OFDM symbolic number of the up DMRS signal of carrying within the scope of window launch time.
Wherein, described network side OCC indication information indicator sequence length equals a complex values sequence in one group of mutually orthogonal complex values sequence of transmitting site number; The bit number of network side OCC indication information is Ceil (log
2(N)), complex values sequence of numeric representation of each OCC indication information; Wherein, N is that sequence length equals the complex values sequence number that one group of mutually orthogonal complex values sequence of transmitting site number comprises, Ceil represents to round up.
In the present embodiment, transmitting site number is 2, so OCC length is 2; In addition, the complex values sequence number that the one group of mutually orthogonal complex values sequence that is 2 due to length comprises is usually designed to two, is specially sequence [1,1] and sequence [1 ,-1], and network side OCC indication information comprises Ceil (log
2(N)) equal 1 bit, concrete value is " 0 ", and wherein, bit is set to " 0 ", represents that sequence [1,1] is used as OCC code, is set to " 1 ", represents that sequence [1 ,-1] is used as OCC code.
Wherein, the OCC indication information of described network side can be carried in the proprietary downlink physical control signal of user or the proprietary downlink system message of user.
In the present embodiment, determine that the OCC code relevant with up DMRS signal is [1,1].
According to described DMRS transmitting site (being specially the 7th OFDM symbol of subframe 1 and subframe 2), launch up DMRS signal with OCC code (being specially [1,1]).Comprise:
First, obtain respectively a DMRS sequence of subframe 1 and 2 the 7th OFDM symbols.
Wherein, sequence length equals the continuous sub-carrier number that network side is distributed to user's side.
Wherein, a described DMRS sequence is defined as the cyclic shift of DMRS basic sequence, and cyclic shift figure place is to be determined by cyclic shift indexing parameter; In addition, described DMRS basic sequence is defined as being less than or equal to the largest prime M of sequence length
zCthe cyclic extensions of the ZC sequence of length, and be less than or equal to the largest prime M of sequence length
zCthe total M of ZC sequence of length
zC-1, specifically use M
zCwhich in-1 basic sequence is to be determined by DMRS basic sequence indexing parameter.Therefore,, in order to determine a concrete DMRS sequence of particular sequence length (equaling the continuous sub-carrier number that network side is distributed to user's side), need to obtain basic sequence index and cyclic shift index.In real system, conventionally there are mapping relations with DMRS transmitting site in basic sequence index and cyclic shift index, and different DMRS transmitting sites is the different DMRS sequence of correspondence conventionally.
Then, by described length, be that DMRS sequence is corresponding multiplies each other for each complex values and each transmitting site the one of OCC code of transmitting site number, to obtain the 2nd DMRS sequence of each transmitting site, specific as follows: OCC code (is specially to [1,1] the 1st complex values ([1])) multiplies each other with a DMRS sequence of the 7th OFDM symbol of subframe 1, to obtain the 2nd DMRS sequence of the 7th OFDM symbol of subframe 1; The 2nd complex values ([1]) in OCC code (being specially [1,1]) and a DMRS sequence of the 7th OFDM symbol of subframe 2 are multiplied each other, to obtain the 2nd DMRS sequence of the 7th OFDM symbol of subframe 2.In the present embodiment, because transmitting site number is 2, and the OCC code using is ([1,1]), the 2nd DMRS sequence of the 7th OFDM symbol of subframe 1 equals a DMRS sequence of the 7th OFDM symbol of subframe 1, and the 2nd DMRS sequence of the 7th OFDM symbol of subframe 2 equals a DMRS sequence of the 7th OFDM symbol of subframe 2.
Finally, by the 2nd DMRS sequence of the 7th OFDM symbol of subframe 1, be mapped to the 7th OFDM character position of subframe 1, and transmitting; The 7th OFDM symbol the 2nd DMRS sequence mapping of subframe 2 arrived to the 7th OFDM character position of subframe 2, and transmitting.
Embodiment bis-:
As shown in Figure 4, be the schematic diagram of the up DMRS method of transmitting of embodiment bis-; Wherein, twill represents up DMRS transmitting site, and non-twill represents upstream data transmitting site.
Suppose normal CP length, and launch time, window was subframe 1, subframe 2 and subframe 3.
Wherein, described launch time, window referred to that network side distributes to the continuous subframe of user's side.
The transmitting site of up DMRS signal can be determined by two kinds of modes, comprise:
Network side and user consult up DMRS signal transmitting site in advance, and each user, when obtaining transmitting site, can directly determine according to the result consulting; Or,
According to the transmitting site indication information of network side, determine up DMRS signal transmitting site.
Wherein, described transmitting site is at least one the OFDM symbol within the scope of window launch time; Therefore the transmitting site of determining up DMRS signal is equivalent to determines the subframe that comprises up DMRS signal within the scope of window in launch time, and within the scope of the subframe that comprises up DMRS signal the OFDM symbol of the up DMRS signal of actual bearer.
Wherein, described transmitting site indication information comprises: subframe position indication information and OFDM character position indication information.Wherein:
Subframe position indication information is indicated the subframe that comprises DMRS signal within the scope of window launch time; Its bit number equals window size launch time, and whether the corresponding subframe of each bit indication within the scope of launch time window comprises up DMRS signal; Wherein, launch time, window size was distributed to the continuous sub-frame of uplink number of user's side for network side.In the present embodiment, subframe position indication information is to carry by 3 bits, the corresponding subframe of each bit, concrete value is " 101 ", wherein, bit is set to " 1 ", represent that corresponding subframe comprises up DMRS signal, otherwise, represent that corresponding subframe does not comprise up DMRS signal, that is, subframe 1 all comprises up DMRS signal with subframe 3.
The OFDM symbol of the up DMRS signal of actual bearer within the scope of the subframe that the indication of OFDM character position indication information comprises up DMRS signal; Its bit number equals the OFDM symbolic number in subframe, and whether the corresponding OFDM symbol within the scope of the subframe that each bit indication comprises up DMRS signal carries up DMRS signal.In the present embodiment, OFDM character position indication information comprises 14 bits, the corresponding OFDM symbol of each bit, concrete value is " 00000010000000 ", and wherein, bit is set to " 1 ", represent the up DMRS signal of corresponding OFDM symbols carry, otherwise represent that corresponding OFDM symbol does not carry up DMRS signal, that is, subframe 1 is used to carry up DMRS signal with the 7th OFDM symbol in subframe 3.
Wherein, the transmitting site indication information of described network side can be carried in the proprietary downlink physical control signal of user or the proprietary downlink system message of user.
In the present embodiment, determine that transmitting site is subframe 1 and 3 the 7th OFDM symbols.
According to network side OCC indication information, determine the OCC code relevant with up DMRS signal.
Wherein, described OCC code is that sequence length equals in one group of mutually orthogonal complex values sequence of transmitting site number, and wherein, transmitting site number is the OFDM symbolic number of the up DMRS signal of carrying within the scope of window launch time.
Wherein, described network side OCC indication information indicator sequence length equals a complex values sequence in one group of mutually orthogonal complex values sequence of transmitting site number; The bit number of network side OCC indication information is Ceil (log
2(N)), complex values sequence of numeric representation of each OCC indication information; Wherein, N is that sequence length equals the complex values sequence number that one group of mutually orthogonal complex values sequence of transmitting site number comprises, Ceil represents to round up.
In the present embodiment, transmitting site number is 2, so OCC length is 2; In addition, the complex values sequence number that the one group of mutually orthogonal complex values sequence that is 2 due to length comprises is usually designed to two, is specially sequence [1,1] and sequence [1 ,-1], and network side OCC indication information comprises Ceil (log
2(N)) equal 1 bit, concrete value is " 1 ", and wherein, bit is set to " 0 ", represents that sequence [1,1] is used as OCC code, is set to " 1 ", represents that sequence [1 ,-1] is used as OCC code.
Wherein, the OCC indication information of described network side can be carried in the proprietary downlink physical control signal of user or the proprietary downlink system message of user.
In the present embodiment, determine that the OCC code relevant with up DMRS signal is [1 ,-1].
According to described DMRS transmitting site (being specially the 7th OFDM symbol of subframe 1 and subframe 3), launch up DMRS signal with OCC code (being specially [1 ,-1]).Comprise:
First, obtain respectively a DMRS sequence of subframe 1 and 3 the 7th OFDM symbols.
Wherein, sequence length equals the continuous sub-carrier number that network side is distributed to user's side.
Wherein, a described DMRS sequence is defined as the cyclic shift of DMRS basic sequence, and cyclic shift figure place is to be determined by cyclic shift indexing parameter; In addition, described DMRS basic sequence is defined as being less than or equal to the largest prime M of sequence length
zCthe cyclic extensions of the ZC sequence of length, and be less than or equal to the largest prime M of sequence length
zCthe total M of ZC sequence of length
zC-1, specifically use M
zCwhich in-1 basic sequence is to be determined by DMRS basic sequence indexing parameter.Therefore,, in order to determine a concrete DMRS sequence of particular sequence length (equaling the continuous sub-carrier number that network side is distributed to user's side), need to obtain basic sequence index and cyclic shift index.In real system, conventionally there are mapping relations with DMRS transmitting site in basic sequence index and cyclic shift index, and different DMRS transmitting sites is the different DMRS sequence of correspondence conventionally.
Then, by described length, be that DMRS sequence is corresponding multiplies each other for each complex values and each transmitting site the one of OCC code of transmitting site number, to obtain the 2nd DMRS sequence of each transmitting site, specific as follows: OCC code (is specially to [1,-1] the 1st complex values ([1])) multiplies each other with a DMRS sequence of the 7th OFDM symbol of subframe 1, to obtain the 2nd DMRS sequence of the 7th OFDM symbol of subframe 1; The 2nd complex values ([1]) in OCC code (being specially [1 ,-1]) and the 7th OFDM symbol the one DMRS sequence of subframe 3 are multiplied each other, to obtain the 2nd DMRS sequence of the 7th OFDM symbol of subframe 3.In the present embodiment, because transmitting site number is 2, and the OCC code using is ([1,-1]), the 7th OFDM symbol the 2nd DMRS sequence of subframe 1 equals the 7th OFDM symbol the one DMRS sequence of subframe 1, and the 7th OFDM symbol the 2nd DMRS sequence of subframe 3 equals the negate of the 7th OFDM symbol the one DMRS sequence of subframe 3.
Finally, by the 2nd DMRS sequence of the 7th OFDM symbol of subframe 1, be mapped to the 7th OFDM character position of subframe 1, and transmitting; The 7th OFDM symbol the 2nd DMRS sequence mapping of subframe 3 arrived to the 7th OFDM character position of subframe 3, and transmitting.
Embodiment tri-:
As shown in Figure 5, be the schematic diagram of the up DMRS method of transmitting of embodiment tri-; Wherein, twill represents up DMRS transmitting site, and non-twill represents upstream data transmitting site.
Suppose normal CP length, and launch time, window was subframe 1, subframe 2 and subframe 3.
Wherein, described launch time, window referred to that network side distributes to the continuous subframe of user's side.
The transmitting site of up DMRS signal can be determined by two kinds of modes, comprise:
Network side and user consult up DMRS signal transmitting site in advance, and each user, when obtaining transmitting site, can directly determine according to the result consulting; Or,
According to the transmitting site indication information of network side, determine up DMRS signal transmitting site.
Wherein, described transmitting site is at least one the OFDM symbol within the scope of window launch time; Therefore the transmitting site of determining up DMRS signal is equivalent to determines the subframe that comprises up DMRS signal within the scope of window in launch time, and within the scope of the subframe that comprises up DMRS signal the OFDM symbol of the up DMRS signal of actual bearer.
Wherein, described transmitting site indication information comprises: subframe position indication information and OFDM character position indication information.Wherein:
Subframe position indication information is indicated the subframe that comprises DMRS signal within the scope of window launch time; Its bit number equals window size launch time, and whether the corresponding subframe of each bit indication within the scope of launch time window comprises up DMRS signal; Wherein, launch time, window size was distributed to the continuous sub-frame of uplink number of user's side for network side.In the present embodiment, subframe position indication information is to carry by 3 bits, the corresponding subframe of each bit, concrete value is " 111 ", wherein, bit is set to " 1 ", represent that corresponding subframe comprises up DMRS signal, otherwise, represent that corresponding subframe does not comprise up DMRS signal, that is, subframe 1 to subframe 3 all comprises up DMRS signal.
The OFDM symbol of the up DMRS signal of actual bearer within the scope of the subframe that the indication of OFDM character position indication information comprises up DMRS signal; Its bit number equals the OFDM symbolic number in subframe, and whether the corresponding OFDM symbol within the scope of the subframe that each bit indication comprises up DMRS signal carries up DMRS signal.In the present embodiment, OFDM character position indication information comprises 14 bits, the corresponding OFDM symbol of each bit, concrete value is " 00000010000000 ", and wherein, bit is set to " 1 ", represent the up DMRS signal of corresponding OFDM symbols carry, otherwise represent that corresponding OFDM symbol does not carry up DMRS signal, that is, subframe 1 to the 7th OFDM symbol in subframe 3 is used to carry up DMRS signal.
Wherein, the transmitting site indication information of described network side can be carried in the proprietary downlink physical control signal of user or the proprietary downlink system message of user.
In the present embodiment, determine that transmitting site is the 7th OFDM symbol of each subframe.
According to network side OCC indication information, determine the OCC code relevant with up DMRS signal.
Wherein, described OCC code is that sequence length equals in one group of mutually orthogonal complex values sequence of transmitting site number, and wherein, transmitting site number is the OFDM symbolic number of the up DMRS signal of carrying within the scope of window launch time.
Wherein, described network side OCC indication information indicator sequence length equals a complex values sequence in one group of mutually orthogonal complex values sequence of transmitting site number; The bit number of network side OCC indication information is Ceil (log
2(N)), complex values sequence of numeric representation of each OCC indication information; Wherein, N is that sequence length equals the complex values sequence number that one group of mutually orthogonal complex values sequence of transmitting site number comprises, Ceil represents to round up.
In the present embodiment, transmitting site number is 3, so OCC length is 3; In addition, the complex values sequence number that the one group of mutually orthogonal complex values sequence that is 3 due to length comprises is usually designed to 3, is specially sequence [1,1,1], sequence [1, e
j2 π/3, e
j4 π/3] and sequence [1, e
j4 π/3, e
j2 π/3], network side OCC indication information comprises Ceil (log
2(N)) equal 2 bits, concrete value is " 00 ", and wherein, bit is set to " 00 ", represents that sequence [1,1,1] is used as OCC code, is set to " 01 ", represents sequence [1, e
j2 π/3, e
j4 π/3] be used as OCC code, be set to " 10 ", represent sequence [1, e
j4 π/3, e
j2 π/3] be used as OCC code.
Wherein, the OCC indication information of described network side can be carried in the proprietary downlink physical control signal of user or the proprietary downlink system message of user.
In the present embodiment, determine that the OCC code relevant with up DMRS signal is [1,1,1].
According to described DMRS transmitting site (being specially the 7th OFDM symbol of each subframe) and OCC code (being specially [1,1,1]), launch up DMRS signal.Comprise:
First, obtain respectively a DMRS sequence of the 7th OFDM symbol of each subframe.
Wherein, sequence length equals the continuous sub-carrier number that network side is distributed to user's side.
Wherein, a described DMRS sequence is defined as the cyclic shift of DMRS basic sequence, and cyclic shift figure place is to be determined by cyclic shift indexing parameter; In addition, described DMRS basic sequence is defined as being less than or equal to the largest prime M of sequence length
zCthe cyclic extensions of the ZC sequence of length, and be less than or equal to the largest prime M of sequence length
zCthe total M of ZC sequence of length
zC-1, specifically use M
zCwhich in-1 basic sequence is to be determined by DMRS basic sequence indexing parameter.Therefore,, in order to determine a concrete DMRS sequence of particular sequence length (equaling the continuous sub-carrier number that network side is distributed to user's side), need to obtain basic sequence index and cyclic shift index.In real system, conventionally there are mapping relations with DMRS transmitting site in basic sequence index and cyclic shift index, and different DMRS transmitting sites is the different DMRS sequence of correspondence conventionally.
Then, by described length, be that DMRS sequence is corresponding multiplies each other for each complex values and each transmitting site the one of OCC code of transmitting site number, to obtain the 2nd DMRS sequence of each transmitting site, specific as follows: OCC code (is specially to [1,1,1] the 1st complex values ([1])) multiplies each other with the 7th OFDM symbol the one DMRS sequence of subframe 1, to obtain the 7th OFDM symbol the 2nd DMRS sequence of subframe 1; The 2nd complex values ([1]) in OCC code (being specially [1,1,1]) and the 7th OFDM symbol the one DMRS sequence of subframe 2 are multiplied each other, to obtain the 7th OFDM symbol the 2nd DMRS sequence of subframe 2; The 3rd complex values ([1]) in OCC code (being specially [1,1,1]) and the 7th OFDM symbol the one DMRS sequence of subframe 3 are multiplied each other, to obtain the 7th OFDM symbol the 2nd DMRS sequence of subframe 3.
In the present embodiment, because transmitting site number is 3, and the OCC code using is ([1,1,1]), the 7th OFDM symbol the 2nd DMRS sequence of subframe 1 equals the 7th OFDM symbol the one DMRS sequence of subframe 1, and the 7th OFDM symbol the 2nd DMRS sequence of subframe 2 equals the 7th OFDM symbol the one DMRS sequence of subframe 2, and the 7th OFDM symbol the 2nd DMRS sequence of subframe 3 equals the 7th OFDM symbol the one DMRS sequence of subframe 3.
Finally, the 7th OFDM symbol the 2nd DMRS sequence mapping of subframe 1 arrived to the 7th OFDM character position of subframe 1, and transmitting; The 7th OFDM symbol the 2nd DMRS sequence mapping of subframe 2 arrived to the 7th OFDM character position of subframe 2, and transmitting; The 7th OFDM symbol the 2nd DMRS sequence mapping of subframe 3 arrived to the 7th OFDM character position of subframe 3, and transmitting.
About the present invention or above-described embodiment, also need additional description:
Due to launch time window or wireless channel conditions may change, therefore, allow up DMRS signal transmitting method semi-static or dynamically change; For example, within some time intervals, user's side is used the up DMRS signal transmitting method based on embodiment mono-, and within another time interval, user's side is used the up DMRS signal transmitting method based on embodiment bis-.
User's side transmission number of plies of individual layer is conceived to, and wherein, the transmission number of plies is called again the order (RANK) of wireless channel between network side and user's side, shows the individual transmission channel number of current support.Attention: if actual user's side transmission number of plies is X (> 1) layer, an above-mentioned X transport layer can be regarded as to X different user can sharing identical up DMRS signal transmitting site.Allow the different subframes that comprise up DMRS signal to there is different up DMRS signal transmitting site numbers, now, the described OFDM character position indication information that surpasses one is required, wherein, within the scope of the subframe that each OFDM character position indication information indication comprises up DMRS signal, or, within the scope of each subframe of a subframe subset that comprises up DMRS signal, the OFDM symbol of the up DMRS signal of actual bearer.
Fig. 6 is the structure chart of the system embodiment of the up DMRS of transmitting provided by the invention.System shown in Figure 6 embodiment, comprising:
Acquisition device 601, for obtaining up DMRS signal transmitting site, and, according to network side orthogonal covering codes OCC indication information, determine the OCC code relevant with up DMRS signal;
Emitter 602, for launching up DMRS signal according to transmitting site and OCC code.
Wherein:
Described up DMRS signal transmitting site is at least one the OFDM symbol within the scope of window launch time; Wherein:
Launch time, window was the continuous sub-frame of uplink that network side is distributed to user's side.
Described DMRS signal transmitting site is contained at least one subframe within the scope of window launch time.
Described DMRS signal transmitting site is determined according to network side transmitting site indication information.
Described transmitting site indication information comprises subframe position indication information and OFDM character position indication information; Wherein:
Subframe position indication information is indicated the subframe that comprises up DMRS within the scope of window launch time;
The OFDM symbol of the up DMRS signal of actual bearer within the scope of the subframe that the indication of OFDM character position indication information comprises up DMRS signal.
Described subframe position indication information bit number equals window size launch time, and whether the corresponding subframe of each bit indication within the scope of launch time window comprises up DMRS signal; Wherein:
Launch time, window size was distributed to the continuous sub-frame of uplink number of user's side for network side.
Described OFDM character position indication information bit number equals OFDM symbolic number in subframe, and whether the corresponding OFDM symbol within the scope of each bit indication subframe carries up DMRS signal.
Described OCC code is that sequence length equals in one group of mutually orthogonal complex values sequence of transmitting site number; Wherein:
Transmitting site number is the OFDM symbolic number of carrying DMRS signal within the scope of window launch time.
Described network side OCC indication information indicator sequence length equals a complex values sequence in one group of mutually orthogonal complex values sequence of transmitting site number.
Described network side OCC indication information bit number is Ceil (log
2(N)), complex values sequence of numeric representation of each OCC indication information; Wherein, N is that sequence length equals the complex values sequence number that one group of mutually orthogonal complex values sequence of transmitting site number comprises, Ceil represents to round up.
Described emitter comprises:
Acquisition module, for according to described transmitting site, obtains a DMRS sequence of each transmitting site; Wherein:
Sequence length equals the continuous sub-carrier number that network side is distributed to user's side;
Computing module, is connected with described acquisition module, for by described length, be transmitting site number OCC code each complex values and each transmitting site the one DMRS sequence is corresponding multiplies each other, to obtain the 2nd DMRS sequence of each transmitting site;
Transmitter module, is connected with described computing module, for the 2nd DMRS sequence mapping of each transmitting site is arrived to described transmitting site, and transmitting.
System embodiment provided by the invention, excessive for prior art up DMRS expense under data service small-cell covering deployment scenario, efficiency is on the low side, the problem of high cost, according to transmitting site and OCC code, launch up DMRS signal, reach the expense that reduces up DMRS signal, and promoted the effect that up small-cell covers capacity.
The all or part of step that one of ordinary skill in the art will appreciate that above-described embodiment can realize by computer program flow process, described computer program can be stored in a computer-readable recording medium, described computer program (as system, unit, device etc.) on corresponding hardware platform is carried out, when carrying out, comprise step of embodiment of the method one or a combination set of.
Alternatively, all or part of step of above-described embodiment also can realize with integrated circuit, and these steps can be made into respectively integrated circuit modules one by one, or a plurality of modules in them or step are made into single integrated circuit module realize.Like this, the present invention is not restricted to any specific hardware and software combination.
Each device/functional module/functional unit in above-described embodiment can adopt general calculation element to realize, and they can concentrate on single calculation element, also can be distributed on the network that a plurality of calculation elements form.
The form of software function module of usining each device/functional module/functional unit in above-described embodiment realizes and during as production marketing independently or use, can be stored in a computer read/write memory medium.The above-mentioned computer read/write memory medium of mentioning can be read-only memory, disk or CD etc.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range described in claim.
Claims (22)
1. a method of launching uplink demodulation reference signal DMRS, is characterized in that, comprising:
Obtain up DMRS signal transmitting site, and, according to the orthogonal covering codes OCC indication information of network side, determine the OCC code relevant with up DMRS signal;
According to described transmitting site and OCC code, launch up DMRS signal.
2. method according to claim 1, is characterized in that, described up DMRS signal transmitting site is at least one orthogonal frequency division multiplex OFDM symbol within the scope of window launch time; Wherein:
Launch time, window was the continuous sub-frame of uplink that network side is distributed to user's side.
3. method according to claim 1 and 2, is characterized in that, described up DMRS signal transmitting site is contained at least one subframe within the scope of window launch time.
4. method according to claim 1 and 2, is characterized in that, described up DMRS signal transmitting site is to determine according to the transmitting site indication information of network side.
5. method according to claim 4, is characterized in that, described transmitting site indication information comprises subframe position indication information and OFDM character position indication information; Wherein:
Subframe position indication information is indicated the subframe that comprises up DMRS within the scope of window launch time;
The OFDM symbol of the up DMRS signal of actual bearer within the scope of the subframe that the indication of OFDM character position indication information comprises up DMRS signal.
6. method according to claim 5, is characterized in that, described subframe position indication information bit number equals window size launch time, and whether the corresponding subframe of each bit indication within the scope of launch time window comprises up DMRS signal; Wherein:
Launch time, window size was distributed to the continuous sub-frame of uplink number of user's side for network side.
7. method according to claim 5, is characterized in that, described OFDM character position indication information bit number equals the OFDM symbolic number in subframe, and whether the corresponding OFDM symbol within the scope of each bit indication subframe carries up DMRS signal.
8. method according to claim 1, is characterized in that, described OCC code is that sequence length equals in one group of mutually orthogonal complex values sequence of transmitting site number; Wherein:
Transmitting site number is the OFDM symbolic number of carrying DMRS signal within the scope of window launch time.
9. method according to claim 8, is characterized in that, described network side OCC indication information indicator sequence length equals a complex values sequence in one group of mutually orthogonal complex values sequence of transmitting site number.
10. method according to claim 9, is characterized in that, the bit number of described network side OCC indication information is Ceil (log
2(N)), complex values sequence of numeric representation of each OCC indication information; Wherein, N is that sequence length equals the complex values sequence number that one group of mutually orthogonal complex values sequence of transmitting site number comprises, Ceil represents to round up.
11. methods according to claim 1, is characterized in that, described according to described transmitting site and OCC code, launch up DMRS signal, comprising:
According to described transmitting site, obtain a DMRS sequence of each transmitting site, wherein, sequence length equals the continuous sub-carrier number that network side is distributed to user's side;
By described length, be transmitting site number OCC code each complex values and each transmitting site the one DMRS sequence is corresponding multiplies each other, to obtain the 2nd DMRS sequence of each transmitting site;
The 2nd DMRS sequence mapping of each transmitting site is arrived to described transmitting site, and transmitting.
12. 1 kinds of systems of launching uplink demodulation reference signal DMRS, is characterized in that, comprising:
Acquisition device, for obtaining up DMRS signal transmitting site, and, according to the orthogonal covering codes OCC indication information of network side, determine the OCC code relevant with up DMRS signal;
Emitter, for according to described transmitting site and OCC code, launches up DMRS signal.
13. systems according to claim 12, is characterized in that, described up DMRS signal transmitting site is at least one orthogonal frequency division multiplex OFDM symbol within the scope of window launch time; Wherein:
Launch time, window was the continuous sub-frame of uplink that network side is distributed to user's side.
14. according to the system described in claim 12 or 13, it is characterized in that, described up DMRS signal transmitting site is contained at least one subframe within the scope of window launch time.
15. according to the system described in claim 12 or 13, it is characterized in that, described up DMRS signal transmitting site is to determine according to the transmitting site indication information of network side.
16. systems according to claim 15, is characterized in that, described transmitting site indication information comprises subframe position indication information and OFDM character position indication information; Wherein:
Subframe position indication information is indicated the subframe that comprises up DMRS within the scope of window launch time;
The OFDM symbol of the up DMRS signal of actual bearer within the scope of the subframe that the indication of OFDM character position indication information comprises up DMRS signal.
17. systems according to claim 16, is characterized in that, described subframe position indication information bit number equals window size launch time, and whether the corresponding subframe of each bit indication within the scope of launch time window comprises up DMRS signal; Wherein:
Launch time, window size was distributed to the continuous sub-frame of uplink number of user's side for network side.
18. systems according to claim 16, is characterized in that, described OFDM character position indication information bit number equals the OFDM symbolic number in subframe, and whether the corresponding OFDM symbol within the scope of each bit indication subframe carries up DMRS signal.
19. systems according to claim 12, is characterized in that, described OCC code is that sequence length equals in one group of mutually orthogonal complex values sequence of transmitting site number; Wherein:
Transmitting site number is the OFDM symbolic number of carrying DMRS signal within the scope of window launch time.
20. systems according to claim 19, is characterized in that, described network side OCC indication information indicator sequence length equals a complex values sequence in one group of mutually orthogonal complex values sequence of transmitting site number.
21. systems according to claim 20, is characterized in that, the bit number of described network side OCC indication information is Ceil (log
2(N)), complex values sequence of numeric representation of each OCC indication information; Wherein, N is that sequence length equals the complex values sequence number that one group of mutually orthogonal complex values sequence of transmitting site number comprises, Ceil represents to round up.
22. systems according to claim 12, is characterized in that, described emitter comprises:
Acquisition module, for according to described transmitting site, obtains a DMRS sequence of each transmitting site, and wherein, sequence length equals the continuous sub-carrier number that network side is distributed to user's side;
Computing module, is connected with described acquisition module, for by described length, be transmitting site number OCC code each complex values and each transmitting site the one DMRS sequence is corresponding multiplies each other, to obtain the 2nd DMRS sequence of each transmitting site;
Transmitter module, is connected with described computing module, for the 2nd DMRS sequence mapping of each transmitting site is arrived to described transmitting site, and transmitting.
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| PCT/CN2013/085570 WO2014110924A1 (en) | 2013-01-18 | 2013-10-21 | Method and system for transmitting uplink demodulation reference signal |
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