CN103037514A - Method and device for transmitting demodulation reference signal in communication network - Google Patents

Abstract

An embodiment of the invention provides a method for transmitting a demodulation reference signal (DMRS) in a base station. The method includes that information of configuration conducted by the base station on a DMRS orthogonal sequence group and indexes of the DMRS orthogonal sequence group is notified to a user terminal; the DMRS orthogonal sequence group is mapped to a source unit set in sub-frames, wherein the DMRS orthogonal sequence group is generated based on a first orthogonal sequence group and a pseudorandom sequence processed through scrambling; and the sub-frames are transmitted through a downlink channel. The pseudorandom sequence processed through the scrambling is generated by multiplying a pseudorandom sequence C and a scrambling sequence V, wherein the scrambling sequence V is a row vector of a matrix pi, and the matrix pi meets conditions of the following formulas. Pi' is conjugate transpose of pi, I is a unit matrix, and alpha is a constant. An improved DMRS orthogonal sequence group can be orthogonal with a DMRS orthogonal sequence group in the existing system and can support more orthogonal DMRS antenna ports.

Description

The method and apparatus that is used for the transmission demodulated reference signal in a kind of communication network

Technical field

The present invention relates to wireless communication field, particularly be used for the method and apparatus of transmission demodulated reference signal in a kind of communication network.

Background technology

In the frame structure of LTE, comprise demodulated reference signal (Demodulation Reference Signal, DMRS).To at down channel, DMRS reflects that certain base station (eNB) issues channel quality information about just in use to the user terminal (UE) of its jurisdiction, and DMRS can be used for estimating instant channel for UE, thereby the data in the downlink frame are carried out demodulation.

Design for DMRS, normal operation Walsh code in the prior art, the conventional sequence such as Golden sequence, PN code, perhaps also can introduce the various sequences of Requirements for Design of Mobile Communications Engineering that are specially, such as relevant (Constant Amplitude Zero Auto-Correlation, the CAZAC) sequence of constant amplitude zero, Zadoff-Chu sequence etc.Usually, the scheme of available technology adopting be orthogonal sequence with a certain particular type map on the subframe in the down channel on the position of antenna in order to the specific resource units that sends reference signal.

Summary of the invention

By some research, the inventor finds, in the frame structure of existing LTE, DMRS usually takies regular length on a period of time territory on the fixed position of frame structure with Walsh (walsh) code form, and namely DMRS of the prior art has constant density in frame structure.This so that among the LTE/LTE-A existing DMRS design have larger defective, especially have the application scenarios of the UE to be dispatched of larger amt for some.Because constant density/length that above-mentioned descending DMRS presents in the downlink frame structure so the maximum quantity of eNB scheduling UE is namely fixed, and can't increase along with the change of application scenarios the maximum quantity of its scheduling UE adaptively.

Therefore, the defective that has in view of the resulting DMRS of above-mentioned analysis, if can propose to be used in a kind of wireless network the scheme of transmission DMRS, so that between eNB and the UE when transmitting downlink frame and DMRS wherein, can utilize the UE of existing dispatch channel resource greater number, simultaneously again DMRS of the prior art is had certain compatibility, then can be to the communication scenes in R11 version standard, especially a fairly large number of scene of UE that need be scheduled such as CoMP or MU-MIMO is highly profitable.

According to one embodiment of present invention, provide a kind of method that in the base station, is used for transmission DMRS, having comprised: user terminal is informed to the configuration information of DMRS orthogonal sequence group and index thereof in described base station; Described DMRS orthogonal sequence group is mapped to resource units collection in the subframe, and wherein, described DMRS orthogonal sequence group generates based on the first orthogonal sequence group and the pseudo random sequence of carrying out after scrambler is processed; Send described subframe by down channel.

Optionally, described pseudo random sequence of carrying out after scrambler is processed generates by following steps: multiply by scramble sequence V at pseudo random sequence C, to generate described pseudo random sequence of carrying out after scrambler is processed, wherein, described scramble sequence V is the row vector of matrix ∏, and described matrix ∏ satisfies following formula:

$\left\{\begin{array}{c}C*{\mathrm{\Π}}^{\′}=0\\ \mathrm{\Π}*{\mathrm{\Π}}^{\′}=\mathrm{\α}\·I\end{array}\right.$

Wherein, ∏ ' is the conjugate transpose of ∏; I is unit matrix, and α is constant.

Optionally, the length of described scramble sequence V is 2 ^K, wherein K is integer and K＞0.

According to another embodiment of the invention, provide a kind of in user terminal the method for the treatment of DMRS, comprising: receive it from the base station to the configuration information of DMRS orthogonal sequence group and index thereof; Wherein, described DMRS orthogonal sequence group generates based on the first orthogonal sequence group and the pseudo random sequence of carrying out after scrambler is processed; According to described configuration information, obtain the DMRS that is configured in the subframe of down channel; Based on described DMRS, estimate described down channel.

Optionally, described pseudo random sequence of carrying out after scrambler is processed generates by following steps: multiply by scramble sequence V at pseudo random sequence C, to generate described pseudo random sequence of carrying out after scrambler is processed, wherein, described scramble sequence V is the row vector of matrix ∏, and described matrix ∏ satisfies following formula:

$\left\{\begin{array}{c}C*{\mathrm{\Π}}^{\′}=0\\ \mathrm{\Π}*{\mathrm{\Π}}^{\′}=\mathrm{\α}\·I\end{array}\right.$

Wherein, ∏ ' is the conjugate transpose of ∏; I is unit matrix, and α is constant.

According to still a further embodiment, provide a kind of device that is used for transmission DMRS in the base station, having comprised: notification unit is used for user terminal is informed to the configuration information of DMRS orthogonal sequence group and index thereof in described base station; Map unit is used for described DMRS orthogonal sequence group is mapped to the resource units collection of subframe, and wherein, described DMRS orthogonal sequence group generates based on the first orthogonal sequence group and the pseudo random sequence of carrying out after scrambler is processed; Transmitting element is used for sending described subframe by down channel.

According to still another embodiment of the invention, provide a kind of in user terminal the device for the treatment of DMRS, comprising: receiving element is used for receiving it to the configuration information of DMRS orthogonal sequence group and index thereof from the base station; Wherein, described DMRS orthogonal sequence group generates based on the first orthogonal sequence group and the pseudo random sequence of carrying out after scrambler is processed; Acquiring unit is used for according to described configuration information, obtains the DMRS that is configured in the subframe of down channel; Estimation unit is used for based on described DMRS, estimates described down channel.

Improved according to an embodiment of the invention DMRS orthogonal sequence group can with version 10 in DMRS orthogonal sequence group quadrature, and can support more quadrature DMRS antenna port.

Description of drawings

By shown embodiment by reference to the accompanying drawings is elaborated, above-mentioned and other features of the present invention will be more obvious, and identical label represents same or analogous parts in the accompanying drawing of the present invention.In the accompanying drawings:

Fig. 1 shows the configuration schematic diagram of DMRS according to an embodiment of the invention in subframe;

Fig. 2 shows the method flow diagram for the transmission demodulated reference signal according to an embodiment of the invention;

Fig. 3 shows the method flow diagram for the treatment of demodulated reference signal according to an embodiment of the invention;

Fig. 4 shows the configuration schematic diagram of DMRS in subframe according to another embodiment of the invention.

Embodiment

Fig. 1 shows the configuration schematic diagram of DMRS in subframe in some embodiments of the invention.The grid matrix of " 12 row * 14 row " represents the Basic Transmission Unit of the down channel between a base station and the UE, i.e. a pair of Physical Resource Block (Physical Resource Block Pair, PRB Pair) among the figure.In addition, for simplicity, among the present invention this Basic Transmission Unit is called a subframe.

Fig. 2 shows the method flow diagram for the transmission demodulated reference signal according to an embodiment of the invention.Below in conjunction with Fig. 1 Fig. 2 is described.As shown in Figure 2, the method goes for the base station (not shown), comprising: configuration information is informed step S101, DMRS orthogonal sequence group mapping step S102, subframe forwarding step S103.

In step S101, user terminal for example by certain signaling, is informed with itself configuration information to DMRS orthogonal sequence group and index thereof in the base station.

In step S102, the base station maps to resource units collection in the subframe with DMRS orthogonal sequence group, for example, maps to the zone shown in the dash area among Fig. 1.

Wherein, DMRS orthogonal sequence group generates based on the first orthogonal sequence group and the pseudo random sequence of carrying out after scrambler is processed.This first orthogonal sequence group can be, for example the Walsh sequence set.This pseudo random sequence can be, for example the Golden sequence.

Concrete, can multiply by scramble sequence V in the Golden sequence C, carry out pseudo random sequence D after scrambler is processed with generation.

In an example, suppose Golden sequence C=[c1c2c3], pseudo random sequence V=[v1v2v3], carry out so the pseudo random sequence D=[c1*v1c2*v2 c3*v3 after scrambler is processed].

Scramble sequence V can obtain in the following manner:

Suppose that all scramble sequence V that satisfy condition consist of matrix ∏, matrix ∏ should satisfy following formula:

$\left\{\begin{array}{c}C*{\mathrm{\Π}}^{\′}=0\\ \mathrm{\Π}*{\mathrm{\Π}}^{\′}=\mathrm{\α}\·I\end{array}\right.$

Wherein, ∏ ' is the conjugate transpose of ∏; I is unit matrix, and α is constant.

Because sequence C is one 3 * 1 vector, therefore, have 2 scramble sequence V and satisfy following formula, for example, in an example, $\mathrm{\Π}=\left[\begin{array}{ccc}1& \exp (j\·2\mathrm{\π}/3)& \exp (j\·4\mathrm{\π}/3)\\ -1& \exp (j\·\mathrm{\π}/3)& \exp (j\·5\mathrm{\π}/3)\end{array}\right].$ The first row of this ∏ matrix and the second row can be respectively as two scramble sequence that satisfy condition.

Owing to carry out the pseudo random sequence D=[c1*v1c2*v2c3*v3 after scrambler is processed] mutually orthogonal with Golden sequence C=[c1c2c3], therefore, it is mutually orthogonal to use in an embodiment of the present invention the pseudo random sequence D carry out after scrambler is processed to carry out using in the DMRS orthogonal sequence group that generates after the OCC operation on the time domain and the prior art pseudo random sequence C to carry out after the OCC operation on the time domain DMRS orthogonal sequence group of generation.Therefore, after the improvement of the present invention the DMRS sequence set can with version 10 in DMRS orthogonal sequence group mutually orthogonal, and can support more quadrature DMRS antenna port.

At last, in step S103, the base station sends above-mentioned subframe by down channel.

It should be noted that: the execution sequence of above-mentioned steps S101 and step S102 in no particular order, namely S102, then execution in step S101 also can be carried out first in the base station.The specific execution sequence of step is not construed as limiting the present invention.

Fig. 3 shows the method flow diagram for the treatment of demodulated reference signal according to an embodiment of the invention.Corresponding to the forwarding step of above-mentioned base station side, comprise configuration information obtaining step S201, DMRS obtaining step S202, down channel estimating step S203 in the method for the treatment of demodulated reference signal in user terminal shown in Fig. 3.

In step S201, UE for example by certain signaling, receives it to the configuration information of DMRS orthogonal sequence group and index thereof from the base station.Wherein, DMRS orthogonal sequence group generates based on the first orthogonal sequence group and the pseudo random sequence of carrying out after scrambler is processed.This first orthogonal sequence group can be, for example the Walsh sequence set.This pseudo random sequence can be, for example the Golden sequence.

In step S202, UE obtains the DMRS that is configured in the subframe of down channel according to configuration information.

In step S203, based on the DMRS that is configured, UE estimates down channel.

It should be noted that: the execution sequence of above-mentioned steps S201 and step S202 in no particular order, namely S202 also can be carried out first in the base station, then, again according to step S201.The specific execution sequence of step is not construed as limiting the present invention.

Because the scramble sequence V that obtains according to the abovementioned embodiments of the present invention is made of binary element, therefore, the DMRS that generates can't guarantee the QPSK modulation.

Based on above-mentioned consideration, as shown in Figure 4, can get up to Physical Resource Block (PRB pair) binding (bundling) many, then, the integral multiple with 2 carries out scrambler as one group to be processed.For example, in Fig. 4, selecting the length of scramble sequence V is 2, and so, the element among the scramble sequence V that satisfies condition can guarantee it is binary.

Certainly, Fig. 4 only is an embodiment, in actual applications, can manyly tie up Physical Resource Block appointing, and the length of scramble sequence V satisfies 2 ^KGet final product, wherein K is integer and K＞0.

More than be the description of technical scheme of the present invention being carried out from the angle of method, below will technical scheme of the present invention be described further from the angle of apparatus module.

According to one embodiment of present invention, provide a kind of device that is used for transmission DMRS in the base station, having comprised: notification unit is used for user terminal is informed to the configuration information of DMRS orthogonal sequence group and index thereof in described base station; Map unit is used for described DMRS orthogonal sequence group is mapped to the resource units collection of subframe, and wherein, described DMRS orthogonal sequence group generates based on the first orthogonal sequence group and the pseudo random sequence of carrying out after scrambler is processed; Transmitting element is used for sending described subframe by down channel.

Optionally, described map unit also comprises: generation unit is used for multiply by scramble sequence V at pseudo random sequence C, to generate described pseudo random sequence of carrying out after scrambler is processed, wherein, described scramble sequence V is the row vector of matrix ∏, and described matrix ∏ satisfies following formula:

$\left\{\begin{array}{c}C*{\mathrm{\Π}}^{\′}=0\\ \mathrm{\Π}*{\mathrm{\Π}}^{\′}=\mathrm{\α}\·I\end{array}\right.$

Wherein, ∏ ' is the conjugate transpose of ∏; I is unit matrix, and α is constant.

Optionally, the length of described scramble sequence V is 2 ^K, wherein K is integer and K＞0.

Optionally, described the first orthogonal sequence group is the Walsh sequence set, and described pseudo random sequence is the Golden sequence.

According to another embodiment of the invention, provide a kind of in user terminal the device for the treatment of DMRS, comprising: receiving element is used for receiving it to the configuration information of DMRS orthogonal sequence group and index thereof from the base station; Wherein, described DMRS orthogonal sequence group generates based on the first orthogonal sequence group and the pseudo random sequence of carrying out after scrambler is processed; Acquiring unit is used for according to described configuration information, obtains the DMRS that is configured in the subframe of down channel; Estimation unit is used for based on described DMRS, estimates described down channel.

In addition, embodiments of the invention can be realized with the combination of software, hardware or software and hardware.Hardware components can utilize special logic to realize; Software section can be stored in the memory, and by suitable instruction execution system, for example microprocessor or special designs hardware are carried out.Those having ordinary skill in the art will appreciate that above-mentioned method and system can and/or be included in the processor control routine with computer executable instructions realizes, for example such as the mounting medium of disk, CD or DVD-ROM, provide such code such as the programmable memory of read-only memory (firmware) or such as the data medium of optics or electronic signal carrier.The system of present embodiment and assembly thereof can be by such as very lagre scale integrated circuit (VLSIC) or gate array, realize such as the semiconductor of logic chip, transistor etc. or such as the hardware circuit of the programmable hardware device of field programmable gate array, programmable logic device etc., also can use the software of being carried out by various types of processors to realize, also can by the combination of above-mentioned hardware circuit and software for example firmware realize.

Although described the present invention with reference to the embodiment that considers at present, should be appreciated that to the invention is not restricted to the disclosed embodiments.On the contrary, the present invention is intended to contain interior included various modifications and the equivalent arrangements of spirit and scope of claims.The scope of following claim meets broad interpretation, in order to comprise all such modifications and equivalent structure and function.

Claims (15)

1. method that is used for transmission DMRS in the base station comprises:

-user terminal is informed to the configuration information of DMRS orthogonal sequence group and index thereof in described base station;

-described DMRS orthogonal sequence group is mapped to resource units collection in the subframe, wherein, described DMRS orthogonal sequence group generates based on the first orthogonal sequence group and the pseudo random sequence of carrying out after scrambler is processed;

-send described subframe by down channel.

2. method according to claim 1 is characterized in that, described pseudo random sequence of carrying out after scrambler is processed generates by following steps:

-multiply by scramble sequence V at pseudo random sequence C, generating described pseudo random sequence of carrying out after scrambler is processed,

Wherein, described scramble sequence V is the row vector of matrix ∏, and described matrix ∏ satisfies following formula:

$\left\{\begin{array}{c}C*{\mathrm{\Π}}^{\′}=0\\ \mathrm{\Π}*{\mathrm{\Π}}^{\′}=\mathrm{\α}\·I\end{array}\right.$

Wherein, ∏ ' is the conjugate transpose of ∏; I is unit matrix, and α is constant.

3. method according to claim 1 is characterized in that, the length of described scramble sequence V is 2 ^K, wherein K is integer and K＞0.

4. method according to claim 1 is characterized in that, described the first orthogonal sequence group is the Walsh sequence set.

5. method according to claim 1 is characterized in that, described pseudo random sequence is the Golden sequence.

One kind in user terminal for the treatment of the method for DMRS, comprising:

-receive it from the base station to the configuration information of DMRS orthogonal sequence group and index thereof; Wherein, described DMRS orthogonal sequence group generates based on the first orthogonal sequence group and the pseudo random sequence of carrying out after scrambler is processed;

-according to described configuration information, obtain the DMRS that is configured in the subframe of down channel;

-based on described DMRS, estimate described down channel.

7. method according to claim 6 is characterized in that, described pseudo random sequence of carrying out after scrambler is processed generates by following steps:

-multiply by scramble sequence V at pseudo random sequence C, generating described pseudo random sequence of carrying out after scrambler is processed,

Wherein, described scramble sequence V is the row vector of matrix ∏, and described matrix ∏ satisfies following formula:

$\left\{\begin{array}{c}C*{\mathrm{\Π}}^{\′}=0\\ \mathrm{\Π}*{\mathrm{\Π}}^{\′}=\mathrm{\α}\·I\end{array}\right.$

Wherein, ∏ ' is the conjugate transpose of ∏; I is unit matrix, and α is constant.

8. method according to claim 6 is characterized in that, the length of described scramble sequence V is 2 ^K, wherein K is integer and K＞0.

9. method according to claim 6 is characterized in that, described the first orthogonal sequence group is the Walsh sequence set, and described pseudo random sequence is the Golden sequence.

10. device that is used for transmission DMRS in the base station comprises:

Notification unit is used for user terminal is informed to the configuration information of DMRS orthogonal sequence group and index thereof in described base station;

Map unit is used for described DMRS orthogonal sequence group is mapped to the resource units collection of subframe, and wherein, described DMRS orthogonal sequence group generates based on the first orthogonal sequence group and the pseudo random sequence of carrying out after scrambler is processed;

Transmitting element is used for sending described subframe by down channel.

11. device according to claim 10 is characterized in that, described map unit also comprises:

Generation unit is used for multiply by scramble sequence V at pseudo random sequence C, generating described pseudo random sequence of carrying out after scrambler is processed,

Wherein, described scramble sequence V is the row vector of matrix ∏, and described matrix ∏ satisfies following formula:

$\left\{\begin{array}{c}C*{\mathrm{\Π}}^{\′}=0\\ \mathrm{\Π}*{\mathrm{\Π}}^{\′}=\mathrm{\α}\·I\end{array}\right.$

Wherein, ∏ ' is the conjugate transpose of ∏; I is unit matrix, and α is constant.

12. device according to claim 10 is characterized in that, the length of described scramble sequence V is 2 ^K, wherein K is integer and K＞0.

13. one kind in user terminal for the treatment of the device of DMRS, comprising:

Receiving element is used for receiving it to the configuration information of DMRS orthogonal sequence group and index thereof from the base station; Wherein, described DMRS orthogonal sequence group generates based on the first orthogonal sequence group and the pseudo random sequence of carrying out after scrambler is processed;

Acquiring unit is used for according to described configuration information, obtains the DMRS that is configured in the subframe of down channel;

Estimation unit is used for based on described DMRS, estimates described down channel.

14. device according to claim 13 is characterized in that, described pseudo random sequence of carrying out after scrambler is processed generates by multiply by scramble sequence V at pseudo random sequence C,

Wherein, described scramble sequence V is the row vector of matrix ∏, and described matrix ∏ satisfies following formula:

$\left\{\begin{array}{c}C*{\mathrm{\Π}}^{\′}=0\\ \mathrm{\Π}*{\mathrm{\Π}}^{\′}=\mathrm{\α}\·I\end{array}\right.$

Wherein, ∏ ' is the conjugate transpose of ∏; I is unit matrix, and α is constant.

15. device according to claim 13 is characterized in that, the length of described scramble sequence V is 2 ^K, wherein K is integer and K＞0.

Images