CN102957471A - Method and system for enhancing demodulation reference signals - Google Patents
Method and system for enhancing demodulation reference signals Download PDFInfo
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Abstract
The invention discloses a method and a system for enhancing demodulation reference signals. By the method and the system, instruction information can be added into high-level RRC (radio resource control) signals. The method further includes jointly determining a service mode of each demodulation reference signal port by combining a LTE (long-term revolution) R10DCI (downlink control information) format with the instruction information added into the high-level RRC signals. The method and the system have the advantages that owing to the technology for enhancing the demodulation reference signals, orthogonal or quasi-orthogonal configuration among demodulation reference signal ports of different users can be realized flexibly without increasing complexity of UE (user equipment) on the basis that backward compatibility of the DCI format is guaranteed, accordingly, the spectral efficiency of a cell can be effectively improved, particularly, interference generated in an MU-MIMO (multiple user multiple-input multiple output) scene or a CoMP (coordinated multiple point transmission and reception) scene can be effectively reduced, the channel estimation precision is improved, and the spectral efficiency is enhanced.
Description
Technical field
The present invention relates to the communications field, be specifically related to a kind of Enhancement Method and system of demodulated reference signal.
Background technology
In wireless communication technology, when the base stations such as the Node B of evolution (eNB) use many antennas to send data, can take the mode of spatial reuse to improve message transmission rate, namely use identical running time-frequency resource in the different different data of aerial position emission at transmitting terminal, the receiving terminals such as subscriber equipment (UE) also use many antenna reception data.
In the situation at alone family, the resource of all antennas is all distributed to same user, this user occupies alone the physical resource that base station side is distributed in a transmission intercal, this transmission means is called alone family multiple-input, multiple-output (Single User Multiple-Input Multiple-Out-put, SU-MIMO); In multi-user's situation, the space resources of different antennae is distributed to different user, a user and other at least one user physical resource that the sharing base side is distributed in a transmission intercal, sharing mode can be space division multiple access mode or space division multiplexing mode, this transmission means is called multi-user's multiple-input, multiple-output (Multiple User Multiple-Input Multiple-Out-put, MU-MIMO), wherein the physical resource of base station side distribution refers to running time-frequency resource.
Transmission system is if support simultaneously SU-MIMO and MU-MIMO, and eNB then needs to provide data under these two kinds of patterns to UE.UE need know that all eNB is for the used order (Rank) of these UE transmission MIMO data when SU-MIMO pattern or MU-MIMO pattern.Under the SU-MIMO pattern, the resource of all antennas is all distributed to same user, and the used number of plies of transmission MIMO data just equals the used order of eNB transmission MIMO data; Under the MU-MIMO pattern, a corresponding user is transmitted total number of plies that the used number of plies is less than eNB transmission MIMO data, if carry out the switching of SU-MIMO pattern and MU-MIMO, eNB need to be in the different transmission mode different control data of UE that send a notice.
Long Term Evolution (Long-Term Evolution, LTE) version (Release, R) following three kinds of downlink physical control channels have been defined in 8 standards: physical down control format indicating channel (Physical Control Format Indicator Channel, PCFICH), physical hybrid automatic repeat request indicator channel (Physical Hybrid Automatic Retransmission Request Indicator Channel, PHICH) and Physical Downlink Control Channel (Physical Downlink Control Channel, PDCCH).Wherein PDCCH is used for bearing downlink control information (Downlink Control Information, DCI), comprising: uplink and downlink schedule information, and uplink power control information.The form of DCI (DCI format) is divided into following several: DCI format 0, DCI format 1, DCI format 1A, DCI format 1B, DCI format 1C, DCI format 1D, DCI format 2, DCI format 2A, DCI format 3 and DCI format 3A etc.; The transmission mode 5 of the support MU-MIMO that wherein defines in the version 8 has been utilized the Downlink Control Information of DCI format 1D, and the descending power territory among the DCI format 1D (Downlink power offset field) (is expressed as δ
Power-offset) be used to indicate that the power for a user reduces by half in the MU-MIMO pattern information of (namely-10log10 (2)).Because 5 of MU-MIMO transmission modes are supported two users' MU-MIMO transmission, by this descending power territory, MU-MIMO transmission mode 5 can be supported the dynamic switching of SU-MIMO pattern and MU-MIMO pattern; But no matter in SU-MIMO pattern or MU-MIMO pattern, this DCI format only supports the transmission of a stream to a UE, although LTE Release 8 supports the alone family transmission of maximum two streams in transmission mode 4, but because the switching between the transmission mode can only be semi-static, so in LTE version 8, can not accomplish the dynamic switching of the multithread transmission of alone family and multi-user transmission.
In the version 9 of LTE, in order to strengthen descending multi-antenna transmission, introduced the transmission mode that double-current wave beam forms (Beamforming), and Downlink Control Information has increased DCI format 2B to support this transmission mode, a scrambler sequence identity (Scrambling Identity is arranged in DCI format 2B, SCID) sign bit is to support two different scrambler sequence, eNB can distribute to different user with these two scrambler sequence, a plurality of users of same resource multiplex.In addition, when only having a transmission block to enable, the antenna port when new data indication (New Data Indication, NDI) bit that the transmission block of disable (Disabled) is corresponding also is used to refer to the individual layer transmission.
In the version 10 (Release 10) of LTE, in order further to strengthen descending multi-antenna transmission, introduced transmission mode 9, on the basis of transmission mode 9 double-current beamforming (pattern 8) in compatible LTE version 9, further be strengthened to the maximum wave beam forming of supporting 8 layer transmission, and Downlink Control Information has increased DCI format 2C to support this transmission mode, in DCI format 2C, with SCID, number of layers, and the mode of antenna port by combined coding design control signal, and reused the SCID bit that is used to indicate the scrambler sequence identity in the pattern 8.Equally, when only having a transmission block to enable, the antenna port when new data indication (NDI) bit that the transmission block of disable is corresponding also is used to refer to the individual layer transmission.In the version 10, pass through quadrature mask (Orthogonal Cover Code between each port, OCC) realize quadrature, the distribution of the OCC code of different port (port 7 is to port one 4) can be unified as shown in table 1, wherein carry demodulated reference signal (demodulation reference signal, DMRS) the upper mode of using of different orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) symbol l ' is according to formula w
p(l ') determines.
Wherein, m '=0,1,2, each physics time/frequency source block is from the relative position of low to high demodulation pilot frequency, n in the difference corresponding diagram 1
PRBCorresponding to the fast index of physics running time-frequency resource that is used for Physical Downlink Shared Channel (Physical Downlink Share Channel, PDSCH) transmission.
Table 1
Although transmission mode 9 is the maximum transfer of data that can support 8 layers under the SU-MIMO pattern, but with respect to pattern 8, MU-MIMO is not strengthened, namely maximum can only support two users and each user can only carry out 1 layer of demodulation pilot frequency quadrature in the transmission situation.The demodulated reference signal that relies on owing to transmission mode 9 simultaneously produces according to cell identity (cell identity), and pattern 8, pattern 9 times, demodulation pilot frequency pattern position between the different nodes is identical, when cell edge, different nodes take that pilot tone can't realize quadrature between the user of same asset, therefore are unfavorable for the elimination of disturbing.Especially in the heterogeneous network, there are comparatively serious interference in macrocell and low power nodes (Low power Node, LPN).In LTE version 11, proposed respectively in heterogeneous network, make macrocell and low power nodes adopt the same cells identity, and in homogenous networks, a plurality of high power nodes adopt the mode of same cells identity, reduce interference between the node by centralized dispatching.The DCI format 2C of Schema-based 9 correspondences, the maximum orthogonal transmission that can only realize 2 layers between two nodes when namely each node can only transmit with 1 layer, could realize the quadrature of demodulation pilot frequency, has greatly limited the gain that cell splitting brings.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of Enhancement Method and system of demodulated reference signal, Effective Raise spectrum efficiency.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of Enhancement Method of demodulated reference signal, it is characterized in that, increase indication information in high-rise RRC signaling, the method also comprises: in conjunction with LTE R10 DCI format and the described indication information that increases in high-rise RRC signaling, jointly determine the occupation mode of demodulated reference signal port.
The method of described definite demodulated reference signal port occupation mode is:
In the RRC signaling, increase restriction demodulated reference signal DMRS port and use information, and according to limiting the port numbers of using in the described RRC signaling, get the common factor in the port numbers of uncurbed port numbers and DCI format indicating, the port that distributes as this transmission.
Described RRC indication information comprises n bit;
Wherein said n is the positive integer more than or equal to 1;
Described n bit indication information is used to indicate the port numbers that the active user limits use, described n=4 or 8.
The mode with the R10 backward compatibility is adopted in corresponding pilot frequency sequence, quadrature mask OCC, the resource unit mapping position of described each port numbers, and the expense of demodulated reference signal is determined by the port number of DCI format indication.
The method of described definite demodulated reference signal port occupation mode also comprises:
In the RRC signaling, increase the information of indication demodulated reference signal type and/or demodulated reference signal expense, and according to the information of described RRC signaling indicating demodulation overhead signal type and/or demodulated reference signal expense and the port numbers of DCI format indicating, determine port and/or DMRS expense that this transmission distributes.
Described RRC indication information comprises n bit; Described RRC indication information comprises n bit;
Wherein, described n is the positive integer more than or equal to 1;
Described n bit indication information is used to indicate type and/or the demodulated reference signal expense of the demodulated reference signal of notifying among the DCI format, described n=1 or 2.
The type of described demodulated reference signal comprises: physics demodulated reference signal port and virtual demodulated reference signal port;
It is expense corresponding to the port that distributes among the DCI format or according to maximum cost that described demodulated reference signal expense is used to indicate the demodulated reference signal expense.
When described demodulated reference signal port type was physics demodulated reference signal port type, the demodulated reference signal port of described DCIformat indication port and LTE R10 definition was for concerning one to one;
When described demodulated reference signal port type was virtual demodulated reference signal port type, the demodulated reference signal port corresponding relation of the port of described DCIfarmat indication and R10 definition was: v_port7＜--p_port9; V_port8＜--〉p_port10; V_port9＜--〉p_port7; V_port10＜--〉p_port8; V_port11＜--〉p_port12; V_port12＜--〉p_port11; V_port13＜--〉p_port14; V_port14＜--〉p_port13;
Wherein said v-port x represents the port that DCI format is indicated, and p-port x represents defined demodulated reference signal port among the R10.
The parameter of indicating described demodulated reference signal type and demodulated reference signal expense is to transmit by the mode of combined coding or absolute coding.
A kind of enhancing system of demodulated reference signal, this system comprise enhancing indication processing unit, demodulated reference signal port assignment unit; Wherein,
Described enhancing indication processing unit is used for increasing indication information in high-rise RRC signaling;
Described demodulated reference signal port assignment unit is used for the described indication information that increases in high-rise RRC signaling in conjunction with LTE R10 DCI format and described enhancing indication processing unit, jointly determines the occupation mode of demodulated reference signal port.
Described demodulated reference signal port assignment unit when determining the occupation mode of demodulated reference signal port, is used for:
In the RRC signaling, increase restriction DMRS port and use information, and according to the port numbers that restriction in the described RRC signaling is used, get the common factor in the port numbers of uncurbed port numbers and DCI format indicating, the port that distributes as this transmission.
Described RRC indication information comprises n bit;
Wherein said n is the positive integer more than or equal to 1;
Described n bit indication information is used to indicate the port numbers that the active user limits use, described n=4 or 8.
The mode with the R10 backward compatibility is adopted in corresponding pilot frequency sequence, OCC, the resource unit mapping position of described each port numbers, and the expense of demodulated reference signal is determined by the port number of DCI format indication.
Described demodulated reference signal port assignment unit when definite demodulated reference signal port occupation mode, also is used for:
In the RRC signaling, increase the information of indication demodulated reference signal type and/or demodulated reference signal expense, and according to the information of described RRC signaling indicating demodulation overhead signal type and/or demodulated reference signal expense and the port numbers of DCI format indicating, determine port and/or DMRS expense that this transmission distributes.
Described RRC indication information comprises n bit; Described RRC indication information comprises n bit;
Wherein, described n is the positive integer more than or equal to 1;
Described n bit indication information is used to indicate type and/or the demodulated reference signal expense of the demodulated reference signal of notifying among the DCI format, described n=1 or 2.
The type of described demodulated reference signal comprises: physics demodulated reference signal port and virtual demodulated reference signal port;
It is expense corresponding to the port that distributes among the DCI format or according to maximum cost that described demodulated reference signal expense is used to indicate the demodulated reference signal expense.
When described demodulated reference signal port type was physics demodulated reference signal port type, the demodulated reference signal port of described DCIformat indication port and LTE R10 definition was for concerning one to one;
When described demodulated reference signal port type was virtual demodulated reference signal port type, the demodulated reference signal port corresponding relation of the port of described DCIfarmat indication and R10 definition was: v_port7＜--p_port9; V_port8＜--〉p_port10; V_port9＜--〉p_port7; V_port10＜--〉p_port8; V_port11＜--〉p_port12; V_port12＜--〉p_port11; V_port13＜--〉p_port14; V_port14＜--〉p_port13;
Wherein said v-port x represents the port that DCI format is indicated, and p-port x represents defined demodulated reference signal port among the R10.
Described enhancing indication processing unit is used for:
By the mode of combined coding or absolute coding, the parameter of the transmission described demodulated reference signal type of indication and demodulated reference signal expense.
The enhancing technology of demodulated reference signal of the present invention on the basis that guarantees DCI format backward compatibility, does not need additionally to increase the complexity of UE, can realize flexibly quadrature or the accurate orthogonal configuration of demodulated reference signal port between the different user; Thereby can Effective Raise cell spectrum efficient, especially can under MU-MIMO or CoMP scene, effectively reduce interference, improve precision of channel estimation, thereby improve spectrum efficiency.
Description of drawings
Fig. 1 a to Fig. 1 c is the demodulation pilot frequency schematic diagram when normal cyclic prefix among the LTE R10;
Fig. 2 is that the embodiment of the invention strengthens schematic diagram based on the demodulated reference signal under Radio Resource control (RRC) signal deployment restrictive ports mode;
Fig. 3 is that the embodiment of the invention is based on the demodulated reference signal enhancing schematic diagram of RRC signal deployment port type and expense indication;
Fig. 4 is that the demodulated reference signal of the embodiment of the invention strengthens general flow chart;
Fig. 5 is that the demodulated reference signal of the embodiment of the invention strengthens system diagram.
Embodiment
For Effective Raise cell spectrum efficient, especially under MU-MIMO or CoMP (coordinated multiple point transmission and reception, the coordinated multipoint transmission) scene, reduce and disturb, improve precision of channel estimation, thereby improve spectrum efficiency; Can be in conjunction with LTE R10 DCI format, in high-rise RRC signaling, increase the indication information of n bit, jointly determined the occupation mode of demodulated reference signal port by above-mentioned DCI format and the indication information that increases; Thereby improve the flexibility ratio of port assignment.Wherein said n can be for more than or equal to 1 positive integer.
Described n bit indication information is used to indicate the port numbers that the active user limits use, described n=4 or 8.Like this, the port numbers that terminal just can be used according to restriction in the described RRC signaling is got the common factor in the port numbers of uncurbed port numbers and DCI format indicating, the port that distributes as this transmission.
The mode with the R10 backward compatibility is adopted in corresponding pilot frequency sequence, quadrature mask (OCC), the resource unit mapping position of above-mentioned each port numbers, and the expense of demodulated reference signal can be determined by the port number of DCI format indication.
Described n bit indication information can also be used to indicate type and/or the demodulated reference signal expense of the demodulated reference signal of notifying among the DCI format, described n=1 or 2;
The type of described demodulated reference signal comprises: physics demodulated reference signal port and virtual demodulated reference signal port; It is expense corresponding to the port that distributes among the DCI format or according to maximum cost that described demodulated reference signal expense is used to indicate the demodulated reference signal expense.
When described demodulated reference signal port type was physics demodulated reference signal port type, the demodulated reference signal port of described DCIformat indication port and LTE R10 definition was for concerning one to one;
When described demodulated reference signal port type was virtual demodulated reference signal port type, the demodulated reference signal port corresponding relation of the port of described DCIfarmat indication and R10 definition was: v_port7＜--p_port9; V_port8＜--〉p_port10; V_port9＜--〉p_port7; V_port10＜--〉p_port8; V_port11＜--〉p_port12; V_port12＜--〉p_port11; V_port13＜--〉p_port14; V_port14＜--〉p_port13; Wherein said v-port x represents the port that DCI format is indicated, and p-port x represents defined demodulated reference signal port among the R10.
Need to prove that the physics demodulated reference signal port that defines in the above-mentioned demodulated reference signal port type and the concept of virtual demodulated reference signal port just for the ease of the description of this patent, are not limited to above-mentioned title in the reality.
The parameter of the type of described indication demodulated reference signal and demodulated reference signal expense can be transmitted by the mode of combined coding or absolute coding.
Describe the present invention below in conjunction with accompanying drawing and embodiment.
In actual applications, can take full advantage of the DCI format that defines among the LTE R10, and on this basis by increasing the high-rise indication information of part, realize the more flexible allocation of demodulated reference signal port, thereby the needs that more adapt to demodulated reference signal configuration under the different scenes, especially under MU-MIMO and HetNet (heterogeneous network, heterogeneous network) and CoMP scene.In an embodiment of the present invention, indicate in conjunction with the mode of high-level signaling with the DCI format 2C of LTE R10, wherein among the DCI format 2C of LTE R10 definition, the related relevant control information of demodulated reference signal port is as shown in table 2.
Control signal form corresponding to demodulated reference signal port assignment among table 2, the LTE R10DCI format 2C
Embodiment 1:
In the present embodiment, the indication information by configuration n bit in the RRC signaling is used to indicate demodulated reference signal port limit information.In conjunction with uncurbed port in the port of DCI format 2C indicating and the RRC signaling, get the common factor of port of above-mentioned two kinds of information indicatings to obtain the final actual port that uses, wherein the expense of demodulated reference signal is determined by the port of DCI format 2C indicating.
For the ease of understanding, provided a kind of specific embodiment in conjunction with Fig. 2, simultaneously with demodulated reference signal pattern shown in Figure 1 as with reference to explanation.In Fig. 2, suppose to have two identical running time-frequency resources of CU to carry out data transfer, and each user transmit the order of using be 2 (among the embodiment with the head biography as the example explanation, but be not limited to this in the actual scene).And in the RRC signaling, ' 0 ' represents not limited port among the figure, and ' 1 ' represents limited port; For the port of LTE R0 definition, the demodulated reference signal port that pi is corresponding is i+7.
Under the mode of LTE R10, the configuration mode of control signal is corresponding configuration index when being two streams of code words shown in the table 2 " 0 " or configuration index " 1 ", therefore according to the configuration mode among the existing LTE R10, the port that different users uses can't be realized the quadrature of demodulated reference signal all corresponding to port 7 and port 8.
In order to realize the orthogonal transmission of two user's demodulated reference signals.In the present embodiment, transmit leg configuration index " 3 " in the allocation list 2 all in control signal, this moment is for two users, the port of DCI format indicating be p0, p1, p2, p3}, wherein pi is corresponding to port i+7; Simultaneously, the recipient is according to this signaling, and the demodulated reference signal pattern that can identify this moment is the demodulated reference signal pattern shown in Fig. 1 b.
Simultaneously, in the demodulated reference signal port limit set in high-rise RRC signaling, be respectively user 1 and user 2 and be configured to " 00110000 " and " 11000000 " (according to concrete application mode, also can indicate with the 4bit equipotential is long in actual applications); Port information in conjunction with the demodulated reference signal port limit information in the RRC signaling and the indication among the DCI format can identify for user 1: this transmission actual effectively port-for-port 7 and port 8; Can identify for user 2: this transmission actual effectively port-for-port 9 and port one 0;
In conjunction with the demodulated reference signal pattern shown in Fig. 1 b, user 1 and user 2 can realize that the mode of quadrature between the demodulated reference signal port transmits.Thereby the raising of the estimation that is conducive to disturb and channel measurement outcome quality.
In addition, by the demodulated reference signal port limit information in the flexible configuration RRC signaling, can also under the mode of backward compatibility, realize the transmission under the accurate quadrature of demodulated reference signal port (quasi-orthogonal) mode between the different user.For example in DCI format, for user 1 and user 2 dispose respectively state as shown in table 2 " 0 " and " 1 ", simultaneously in the RRC signaling, the bit of the information of demodulated reference signal port limit all is configured to " 0 ", then can realize the transmission under user 1 and user's 2 the accurate orthogonal manner.
During concrete the application, by the way, can also realize the original position of flexible configuration demodulated reference signal port.
Embodiment 2:
In the present embodiment, by the indication information of configuration n bit in the RRC signaling, be used to indicate type and/or the Overhead of the demodulated reference signal port of notifying among the DCIformat.Described demodulated reference signal type comprises physics demodulated reference signal port type and virtual demodulated reference signal port type.
When being configured to physics demodulated reference signal port type, the demodulated reference signal port of notifying among the DCI format is consistent with the demodulated reference signal port of LTE R10 definition, and is namely corresponding one by one; When being configured to virtual demodulated reference signal port type, have specific mapping relations between the demodulated reference signal port that defines among the demodulated reference signal port of notifying among the DCI format and the LTE R10, and these mapping relations are transparent to UE.
For example use the demodulated reference signal port (because consistent with physics demodulated reference signal port, for convenience of description, the back directly is referred to as physics demodulated reference signal port) of p-port (k) expression LTE R10 definition; The demodulated reference signal port of notifying among v-port (k) the expression DCI format, then:
When the demodulated reference signal port type in the RRC signaling was configured to physics demodulated reference signal type, v-port (k) was corresponding one by one with p-port (k);
When the demodulated reference signal port type in the RRC signaling is configured to virtual demodulated reference signal port type, v-port (k)=f (p-port (k)); Here f (x) expression is to the mapping mode of x.Can according to following mode carry out mapping between physics demodulated reference signal port and the virtual demodulated reference signal port: v_port7＜--p_port9; V_port8＜--〉p_port10; V_port9＜--〉p_port7; V_port10＜--〉p_port8; V_port11＜--〉p_port12; V_port12＜--〉p_port11; V_port13＜--〉p_port14; V_port14＜--〉p_port13;
By shown in Figure 3, in the RRC signaling, suppose low bit representation demodulated reference signal expense among the figure; High bit representation port type; For the port of LTE R0 definition, the demodulated reference signal port that pi is corresponding is i+7.
Among Fig. 3, the demodulated reference signal port that disposes among user 1 and user's 2 the DCI format equally all is port 7 and port 8, corresponding in the table 2 during two streams of code words, corresponding configuration index is " 0 " or " 1 ", but the demodulated reference signal port type that disposes in the RRC signaling is different:
What dispose in user 1 the RRC signaling is physics demodulated reference signal port type, and therefore corresponding p-port is port 7 and port 8; And what dispose in user 2 the RRC signaling is virtual demodulated reference signal port type, and therefore corresponding p-port is port 9 and port one 0;
When the expense that is configured to demodulated reference signal when the rrc message that is used to indicate the demodulated reference signal expense is maximum demodulated reference signal expense, then can realize demodulated reference signal quadrature between user 1 and the user 2; And when the RRC signal deployment that is used to indicate the demodulated reference signal expense for according to the demodulated reference signal expense of DCI format indication the time, then can realize the accurate quadrature of demodulated reference signal between user 1 and the user 2.
By the flexible configuration to the demodulated reference signal port type information in the RRC signaling, in the time of can also realizing that different user takies same asset in conjunction with DCIformat 2C, use not homotactic mode to carry out accurate orthogonal configuration.
As seen, can realize the flexible configuration of demodulated reference signal between the different user by embodiment 2 described modes, thereby realize the compromise between expense and the precision of channel estimation.
In conjunction with above each embodiment as can be known, the Enhancement Method of demodulated reference signal of the present invention has operation thinking as shown in Figure 4.Referring to Fig. 4, Fig. 4 is that the demodulated reference signal of the embodiment of the invention strengthens general flow chart, and this flow process may further comprise the steps:
Step 410: in high-rise RRC signaling, increase indication information.
Step 420: in conjunction with LTE R10 DCI format and the described indication information that in high-rise RRC signaling, increases, jointly determine the occupation mode of demodulated reference signal port.
In order to guarantee that the various embodiments described above and operation thinking can realize smoothly, can carry out setting as shown in Figure 5.Referring to Fig. 5, Fig. 5 is that the demodulated reference signal of the embodiment of the invention strengthens system diagram, and this system comprises continuous enhancing indication processing unit, demodulated reference signal port assignment unit.
When practical application, strengthen the indication processing unit and can in high-rise RRC signaling, increase indication information.The described indication information that demodulated reference signal port assignment unit can increase in high-rise RRC signaling in conjunction with LTE R10DCI format and described enhancing indication processing unit is determined the occupation mode of demodulated reference signal port jointly.
In sum as seen, no matter be method or system, the enhancing technology of demodulated reference signal of the present invention is on the basis that guarantees DCI format backward compatibility, do not need additionally to increase the complexity of UE, can realize flexibly quadrature or the accurate orthogonal configuration of demodulated reference signal port between the different user; Thereby can Effective Raise cell spectrum efficient, especially can under MU-MIMO or CoMP scene, effectively reduce interference, improve precision of channel estimation, thereby improve spectrum efficiency.
The above is preferred embodiment of the present invention only, is not for limiting protection scope of the present invention.
Claims (18)
1. the Enhancement Method of a demodulated reference signal, it is characterized in that, in high-rise radio resource control RRC signaling, increase indication information, the method also comprises: in conjunction with Long Term Evolution LTE version R10 Downlink Control Information DCI form format and the described indication information that increases in high-rise RRC signaling, jointly determine the occupation mode of demodulated reference signal port.
2. method according to claim 1 is characterized in that, the method for described definite demodulated reference signal port occupation mode is:
In the RRC signaling, increase restriction demodulated reference signal DMRS port and use information, and according to limiting the port numbers of using in the described RRC signaling, get the common factor in the port numbers of uncurbed port numbers and DCI format indicating, the port that distributes as this transmission.
3. method according to claim 2 is characterized in that, described RRC indication information comprises n bit;
Wherein said n is the positive integer more than or equal to 1;
Described n bit indication information is used to indicate the port numbers that the active user limits use, described n=4 or 8.
4. according to claim 2 or 3 described methods, it is characterized in that,
The mode with the R10 backward compatibility is adopted in corresponding pilot frequency sequence, quadrature mask OCC, the resource unit mapping position of described each port numbers, and the expense of demodulated reference signal is determined by the port number of DCI format indication.
5. according to claim 1 to 3 each described methods, it is characterized in that the method for described definite demodulated reference signal port occupation mode also comprises:
In the RRC signaling, increase the information of indication demodulated reference signal type and/or demodulated reference signal expense, and according to the information of described RRC signaling indicating demodulation overhead signal type and/or demodulated reference signal expense and the port numbers of DCI format indicating, determine port and/or DMRS expense that this transmission distributes.
6. method according to claim 5 is characterized in that, described RRC indication information comprises n bit; Described RRC indication information comprises n bit;
Wherein, described n is the positive integer more than or equal to 1;
Described n bit indication information is used to indicate type and/or the demodulated reference signal expense of the demodulated reference signal of notifying among the DCI format, described n=1 or 2.
7. method according to claim 5 is characterized in that,
The type of described demodulated reference signal comprises: physics demodulated reference signal port and virtual demodulated reference signal port;
It is expense corresponding to the port that distributes among the DCI format or according to maximum cost that described demodulated reference signal expense is used to indicate the demodulated reference signal expense.
8. method according to claim 5 is characterized in that,
When described demodulated reference signal port type was physics demodulated reference signal port type, the demodulated reference signal port of described DCIformat indication port and LTE R10 definition was for concerning one to one;
When described demodulated reference signal port type was virtual demodulated reference signal port type, the demodulated reference signal port corresponding relation of the port of described DCIfarmat indication and R10 definition was: v_port7＜--p_port9; V_port8＜--〉p_port10; V_port9＜--〉p_port7; V_port10＜--〉p_port8; V_port11＜--〉p_port12; V_port12＜--〉p_port11; V_port13＜--〉p_port14; V_port14＜--〉p_port13;
Wherein said v-port x represents the port that DCI format is indicated, and p-port x represents defined demodulated reference signal port among the R10.
9. method according to claim 5 is characterized in that,
The parameter of indicating described demodulated reference signal type and demodulated reference signal expense is to transmit by the mode of combined coding or absolute coding.
10. the enhancing system of a demodulated reference signal is characterized in that, this system comprises enhancing indication processing unit, demodulated reference signal port assignment unit; Wherein,
Described enhancing indication processing unit is used for increasing indication information in high-rise RRC signaling;
Described demodulated reference signal port assignment unit is used for the described indication information that increases in high-rise RRC signaling in conjunction with LTE R10 DCI format and described enhancing indication processing unit, jointly determines the occupation mode of demodulated reference signal port.
11. system according to claim 10 is characterized in that, described demodulated reference signal port assignment unit when determining the occupation mode of demodulated reference signal port, is used for:
In the RRC signaling, increase restriction DMRS port and use information, and according to the port numbers that restriction in the described RRC signaling is used, get the common factor in the port numbers of uncurbed port numbers and DCI format indicating, the port that distributes as this transmission.
12. system according to claim 11 is characterized in that, described RRC indication information comprises n bit;
Wherein said n is the positive integer more than or equal to 1;
Described n bit indication information is used to indicate the port numbers that the active user limits use, described n=4 or 8.
13. according to claim 10 or 11 described systems, it is characterized in that,
The mode with the R10 backward compatibility is adopted in corresponding pilot frequency sequence, OCC, the resource unit mapping position of described each port numbers, and the expense of demodulated reference signal is determined by the port number of DCI format indication.
14. to 12 each described systems, it is characterized in that according to claim 10 described demodulated reference signal port assignment unit when definite demodulated reference signal port occupation mode, also is used for:
In the RRC signaling, increase the information of indication demodulated reference signal type and/or demodulated reference signal expense, and according to the information of described RRC signaling indicating demodulation overhead signal type and/or demodulated reference signal expense and the port numbers of DCI format indicating, determine port and/or DMRS expense that this transmission distributes.
15. method according to claim 14 is characterized in that, described RRC indication information comprises n bit; Described RRC indication information comprises n bit;
Wherein, described n is the positive integer more than or equal to 1;
Described n bit indication information is used to indicate type and/or the demodulated reference signal expense of the demodulated reference signal of notifying among the DCI format, described n=1 or 2.
16. method according to claim 14 is characterized in that,
The type of described demodulated reference signal comprises: physics demodulated reference signal port and virtual demodulated reference signal port;
It is expense corresponding to the port that distributes among the DCI format or according to maximum cost that described demodulated reference signal expense is used to indicate the demodulated reference signal expense.
17. system according to claim 14 is characterized in that,
When described demodulated reference signal port type was physics demodulated reference signal port type, the demodulated reference signal port of described DCIformat indication port and LTE R10 definition was for concerning one to one;
When described demodulated reference signal port type was virtual demodulated reference signal port type, the demodulated reference signal port corresponding relation of the port of described DCIfarmat indication and R10 definition was: v_port7＜--p_port9; V_port8＜--〉p_port10; V_port9＜--〉p_port7; V_port10＜--〉p_port8; V_port11＜--〉p_port12; V_port12＜--〉p_port11; V_port13＜--〉p_port14; V_port14＜--〉p_port13;
Wherein said v-port x represents the port that DCI format is indicated, and p-port x represents defined demodulated reference signal port among the R10.
18. system according to claim 14 is characterized in that, described enhancing indication processing unit is used for:
By the mode of combined coding or absolute coding, the parameter of the transmission described demodulated reference signal type of indication and demodulated reference signal expense.
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