CN101552687B - Method, system and device for improving channel estimation accuracy of user equipment - Google Patents
Method, system and device for improving channel estimation accuracy of user equipment Download PDFInfo
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Abstract
The invention discloses a method for improving channel estimation accuracy of user equipment, which comprises the following steps: determining a leisure time T between a unicast symbol and a multicastsymbol in a multimedia broadcast/multicast service (MBMS) subframe; adding a pilot frequency symbol between the unicast symbol and the multicast symbol by utilizing the leisure time T, wherein the nu mber of sub-carriers corresponding to the pilot frequency symbol is determined by the leisure time T; and transmitting MBMS service to the user equipment (UE), wherein the UE utilizes the added pilot frequency to carry out channel estimation. The invention also discloses a system and a corresponding device for improving the estimation accuracy of the user equipment. The invention adds the pilot frequency symbol between the unicast symbol and the multicast symbol through the leisure time T in the MBMS subframe so as to achieve the aim of improving the accuracy of the channel estimation of the UE.
Description
Technical field
The present invention relates to the mobile communication technology field, be particularly related to mixed carrier MBMS (Multimedia Broadcast and Multicast Service, when multi-media broadcasting service) business is transmitted, improve the mthods, systems and devices of channel estimation accuracy of user equipment.
Background technology
MBMS is the multimedia broadcasting and multicast function of definition among the 3GPP (3rd Generation Partnership Project, third generation partner program).The MBMS technology is mainly at existing CDMA (Code Division Multiple Access, code division multiple access) in the system, original classes of messages broadcast capability is strengthened, the technology that a little arrives the unidirectional multimedia service of multiple spot is provided, thereby realize that Internet resources are shared, improve utilization rate of network resource, especially Bao Gui air interface resource.Operator just can carry out mobile phone TV services with lower network design cost like this.MBMS supports multi-media broadcasting service and two kinds of patterns of multicast service, both can be with multimedia video information directly to all users broadcastings, the contracted user that also can send to one group of charge watches, can help operator to carry out multimedia advertising, free and multiple commercial application the such as pay-television channels, multimedia message mass-sending.MBMS can provide the following biography of the unidirectional multi-medium data from any to multiple spot in mode very efficient, economic, that share for a plurality of users.Above-mentioned advantage just because of MBMS makes it become main demand parameter in LTE (Long Term Evolution, the Long Term Evolution) project.
At present, (the Frequency Division Duplex of FDD among the LTE, Frequency Division Duplexing (FDD)) and TDD (Time Division Duplex, time division duplex) frame structure all adopts subframe (subframe) structure of 1ms, wherein, and as shown in Figure 1, frame assumption diagram for prior art TDD, half radio frames (half-frame) of each TDD radio frames (One radio frame) is made up of 5 subframes, and each subframe is 1ms, and each subframe is made of the Slot of two 0.5ms.
According to the frame structure of TDD among Fig. 1,3GPP has carried out following configuration to the Resource Block of LTE system,
Table 1 is the configuration of LTE system resource block
For mixed carrier, short CP (Normal cyclic prefix, short Cyclic Prefix) and two kinds of configuration modes of long CP (Extended cyclic prefix, long loop prefix) are arranged.Wherein, as can be seen from the above table, for sub-carrier number is that 12 short CP configuration and long CP dispose, its shared OFDM (Orthogonal Frequency Division Multiplexing, OFDM) symbolic number is different, and a subframe can comprise 7 OFDM symbols for short CP configuration; And a subframe only can comprise 6 OFDM symbols for long CP configuration.
When sending the MBMS business on mixed carrier, previous or two OFDM symbols of MBMS subframe are left unicast service (Unicast) for, and remaining OFDM symbol is left the professional use of MBMS for.Wherein, the OFDM symbol that unicast service adopted is called unicast symbols, the OFDM symbol that the MBMS business is adopted is called multicast symbol.Certainly also do not get rid of here because of reasons such as sub-frame of uplink distribution, mixed carrier MBMS subframe adopts the situation of a plurality of OFDM symbols as unicast service, as adopts the unicast symbols more than three or three.
Made regulation to sending the MBMS business on the mixed carrier among the 3GPP: when sending the MBMS business on mixed carrier, the CP of unicast symbols adopts short CP structure, and pilot tone adopts the pilot tone of clean culture, and the multicast symbol of MBMS business adopts long CP structure.From the afore mentioned rules of 3GPP as can be seen, if previous or two OFDM symbols are unicast symbols, it is poor that the short CP of unicast symbols will produce a period of time with the long CP of the system of LTE shown in the table 1 multicast symbol so, in order to keep the time slot alignment of multicast symbol, will after finishing, insert unicast service one corresponding period, the time that this section benefit is gone between unicast symbols and the multicast symbol can be referred to as free time T, for instance:
1, the situation of a unicast symbols of unicast service employing in the MBMS subframe:
The short CP of first unicast symbols is sampled to 160, is sampled to 512 for the long CP of 15KHz subcarrier situation, and wherein each sampling time corresponding is Ts=1/ (15000 * 2048) second.This situation T of following free time is (512-160) * Ts=11.4583us just so.
2, the situation of two unicast symbols of unicast service employing in the MBMS subframe:
For the situation that adopts a plurality of unicast symbols, the sampling of the short CP of each unicast symbols correspondence is also incomplete same.Wherein the corresponding short CP of first unicast symbols is sampled to 160, and the corresponding short CP symbol of other unicast symbols be sampled to 144, so this moment, free time T is (2 * 512-160-144) * Ts=23.4375us just.
The free time T that produces when mixed carrier sends the MBMS business as can be seen from above-mentioned two kinds of situations still is long, but at present to how using this section free time to make concrete regulation, prior art does not have following several processing method to the free time between unicast symbols and the multicast symbol to 3GPP:
1, do not use this section free time T, that is to say in this free time T not send any data.So this method is beyond doubt to having a kind of waste of interface-free resources now.
2, with the CP of this section free time T, that is to say the length that increases the long CP of MBMS first OFDM symbol of part as first multicast symbol of MBMS part.But because the long CP of MBMS part itself is long, so the gain that this method obtains is not high.
3, this section free time T is done the cyclic suffix (cyclicpostfix) of last OFDM symbol of clean culture part, that is to say when an OFDM symbol is used as unicast service, increase the cyclic suffix of 11.4583us in this OFDM symbol back.The cyclic suffix of second OFDM symbol increase 23.4375us when two OFDM symbols are used as unicast service.As shown in Figure 2, for prior art free time T is made the schematic diagram of the cyclic suffix of last OFDM symbol of clean culture part.Though this method is said the suffix of this section free time T as the clean culture part, can certain gain be arranged to system.Adopt at unicast service under the situation of an OFDM symbol, free time T (11.4583us) is still had certain gain as cyclic suffix to system.But adopt at unicast service under the situation of two OFDM symbols, this section free time T (23.4375us) is just long, if free time T is also very limited to the gain of system so as cyclic suffix, therefore waste with regard to some for the use of this section free time T like this.
The shortcoming of prior art is when unicast service adopts two or more unicast symbols, only insert reference in first unicast symbols and meet, and follow-up unicast symbols is no longer inserted reference symbol, therefore can cause the inaccurate of channel estimating.As shown in Figure 3, be the pilot tone pattern of prior art clean culture different antennae number, as can be seen from the figure only be inserted with reference symbol R0, and second unicast symbols do not inserted any reference symbol at two frequencies of first unicast symbols.This schematic diagram only shows the situation that unicast service uses two unicast symbols, if unicast service adopts a plurality of unicast symbols, so follow-up unicast symbols is not all inserted corresponding reference symbol, therefore will be more obvious to the inaccurate problem of channel estimating.
Summary of the invention
The problem to be solved in the present invention provides a kind of mthods, systems and devices that improve channel estimation accuracy of user equipment, solving prior art adopts under the situation of two unicast symbols or a plurality of unicast symbols, because only be inserted with reference symbol and cause the inaccurate technological deficiency of channel estimating in first unicast symbols at unicast service.
For achieving the above object, the invention discloses a kind of method that improves channel estimation accuracy of user equipment, may further comprise the steps: determine the free time T between the unicast symbols and multicast symbol in the multi-media broadcasting service MBMS subframe; Utilize described free time T to increase frequency pilot sign between described unicast symbols and described multicast symbol, the subcarrier number of described frequency pilot sign correspondence is determined by described free time T; To UE (UserEquipment, subscriber equipment) MBMS transmission business, described UE utilizes the pilot tone of described increase to carry out channel estimating.
As an example of this method, the free time T in described definite MBMS subframe between unicast symbols and the multicast symbol is specially: the number according to unicast symbols in the described MBMS subframe is determined described free time T.
In above-mentioned example, utilizing described free time T to increase frequency pilot sign between described unicast symbols and described multicast symbol specifically may further comprise the steps: the shared time T data of data division that determines described frequency pilot sign according to subcarrier spacing F and described free time T, Tdata=1/ (N * F) wherein, and Tdata＜free time T, N are positive integer; Determine the shared time T cp of described frequency pilot sign CP part according to the shared time T data of the data division of described frequency pilot sign, wherein, preferably, determine that the shared time T cp of described CP part can adopt following formula: Tcp=free time T-Tdata.
As an example of this method, preferably, when in the described MBMS subframe two unicast symbols being arranged, it is 6.7675us that described frequency pilot sign adopts Tcp, and Tdata is the OFDM symbolic construction of 16.67us; When in the described MBMS subframe three unicast symbols being arranged, it is 13.1945us that described frequency pilot sign adopts Tcp, and Tdata is the OFDM symbolic construction of 22.222us.
An example as this method, described UE utilizes the pilot tone of described increase to carry out channel estimating and is specially: described UE utilizes the pilot tone of described increase to carry out channel estimating, or described UE uses the pilot tone of described increase and the mode of existing pilot tone interpolation to carry out channel estimating.
As an example of this method,, further comprising the steps of: as when adopting many antenna transmission, the frequency pilot sign that increases to be carried out sign indicating number branch orthogonalization process utilizing free time T increases frequency pilot sign between described unicast symbols and described multicast symbol after.
The invention also discloses a kind of system that improves channel estimation accuracy of user equipment, comprise E-NodeB and at least one UE, described E-NodeB, be used for the free time T between definite MBMS subframe unicast symbols and the multicast symbol, utilize described free time T between described unicast symbols and described multicast symbol, to increase frequency pilot sign, the subcarrier number of described frequency pilot sign correspondence is definite by described free time T, and to user equipment (UE) MBMS transmission business; Described UE is used to receive the MBMS business of described E-NodeB transmission, and utilizes the pilot tone of described increase to carry out channel estimating, or uses the pilot tone of described increase and the mode of existing pilot tone interpolation to carry out channel estimating.
As an example of this system, preferably, when in the described MBMS subframe two unicast symbols being arranged, described frequency pilot sign adopts the OFDM symbolic construction of 6.7675us+16.67us; When in the described MBMS subframe three unicast symbols being arranged, described frequency pilot sign adopts the OFDM symbolic construction of 13.1945us+22.222us.
The invention also discloses a kind of evolution base station E-NodeB, comprise that free time determination module, frequency pilot sign increase module and the professional transport module of MBMS, described free time determination module, be used for determining free time T between unicast symbols and the multicast symbol according to the number of MBMS subframe unicast symbols; Described frequency pilot sign increases module, is used to utilize described free time T to increase frequency pilot sign between described unicast symbols and described multicast symbol, and the subcarrier number of described frequency pilot sign correspondence is determined by described free time T; The professional transport module of described MBMS is used for the UE MBMS transmission business in the sub-district.
An example as this E-NodeB, described frequency pilot sign increases module and comprises frequency pilot sign preservation submodule, frequency pilot sign reading submodule and frequency pilot sign add submodule, described frequency pilot sign is preserved submodule, be used to preserve frequency pilot sign to be added, reach the corresponding relation of unicast symbols number in described frequency pilot sign and the described MBMS subframe; Described frequency pilot sign reading submodule is used for preserving module according to described MBMS subframe unicast symbols number from described frequency pilot sign and reads corresponding frequency pilot sign; Described frequency pilot sign adds submodule, is used for the frequency pilot sign that described frequency pilot sign reading submodule reads was added in free time between described unicast symbols and the described multicast symbol.
An example as this E-NodeB, the corresponding relation of unicast symbols number is specially in described frequency pilot sign and the described MBMS subframe: when in the described MBMS subframe two unicast symbols being arranged, described frequency pilot sign adopts the OFDM symbolic construction of 6.7675us+16.67us; When in the described MBMS subframe three unicast symbols being arranged, described frequency pilot sign adopts the OFDM symbolic construction of 13.1945us+22.222us.
The invention also discloses a kind of user equipment (UE), comprise the professional receiver module of MBMS, frequency pilot sign parsing module and channel estimation module, the professional receiver module of described MBMS is used to receive the MBMS business that described E-NodeB transmits; Described frequency pilot sign parsing module is used for from frequency pilot sign and original frequency pilot sign of the described increase of MBMS subframe parsing of the professional receiver module reception of described MBMS; Described channel estimation module is used to utilize the pilot tone of described increase to carry out channel estimating, or uses the pilot tone of described increase and the mode of existing pilot tone interpolation to carry out channel estimating.
Technical scheme of the present invention has the following advantages, and the present invention increases frequency pilot sign by utilizing the free time T in the MBMS subframe between unicast symbols and multicast symbol, thereby makes UE can utilize the pilot tone of increase to improve the accuracy of UE channel estimating.And that utilization of the present invention is the unspecified free time T of 3GPP, need not existing frame structure is made any change, realizes simple.
Description of drawings
Fig. 1 is the frame assumption diagram of prior art TDD;
Fig. 2 is free time T for prior art the schematic diagram of the cyclic suffix of last OFDM symbol of clean culture part;
Fig. 3 is the pilot tone pattern of prior art clean culture different antennae number;
Fig. 4 improves the method flow diagram of channel estimation accuracy of user equipment for the present invention;
Mixed carrier MBMS subframe structure figure behind increase frequency pilot sign when Fig. 5 adopts two unicast symbols for unicast service of the present invention;
Mixed carrier MBMS subframe structure figure behind increase frequency pilot sign when Fig. 6 adopts three unicast symbols for unicast service of the present invention;
Fig. 7 improves the system construction drawing of channel estimation accuracy of user equipment for the present invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail:
The present invention mainly utilizes the free time T in the MBMS subframe, by increase new frequency pilot sign between unicast symbols and multicast symbol, makes UE can utilize newly-increased pilot tone to improve the accuracy of UE channel estimating.Particularly when unicast service adopts a plurality of unicast symbols, more obvious to the raising of UE channel estimation accuracy.
As shown in Figure 4, improve the method flow diagram of channel estimation accuracy of user equipment for the present invention, this method is by inserting newly-increased frequency pilot sign in the free time T between unicast symbols and multicast symbol, thereby make UE can utilize this newly-increased pilot tone to improve the accuracy of channel estimating, specifically may further comprise the steps:
Step S401, E-NodeB determine the free time T between the unicast symbols and multicast symbol in the MBMS subframe.Wherein as a specific embodiment of the present invention, the present invention can determine this free time T according to the number of unicast symbols in the described MBMS subframe.If for example unicast service adopts a unicast symbols in the MBMS subframe, should free time T be (512-160) * Ts=11.4583us just then; If unicast service adopts two unicast symbols in the MBMS subframe, should free time T be (2 * 512-160-144) * Ts=23.4375us just then.If under the TDD situation when the sub-frame of uplink allocation proportion is big, just the down control channel that needs is just many, therefore the unicast symbols that this moment, unicast service adopted may for example adopt three unicast symbols or more more than two.Just can obtain unicast service with reference to aforesaid way of the present invention this moment so, the free time T when for example adopting three unicast symbols is (3 * 512-160-144-144) * T=35.4167us.
Step S402, behind definite free time T, E-NodeB utilizes this free time T to increase one or more frequency pilot signs between unicast symbols and multicast symbol, and wherein, the subcarrier number of frequency pilot sign correspondence is determined by free time T.Preferably, increase a frequency pilot sign among the present invention between unicast symbols and multicast symbol, this frequency pilot sign is the OFDM symbol of being made up of CP and data division.Suppose the F that is spaced apart of subcarrier, the time T cp that frequency pilot sign CP part is shared, the shared time of the data division of frequency pilot sign is Tdata, because the point of pilot tone on frequency domain needs the subcarrier of the clean culture frequency domain of corresponding integral multiple, therefore (N * F), N is a positive integer to Tdata=1/.But owing to increase frequency pilot sign in the T between needing at one's leisure, so the shared time of this frequency pilot sign should be less than or equal to this section free time T.As a preferred version of the present invention, the newly-increased shared time of frequency pilot sign just in time fills up this section free time T, that is to say Tcp+Tdata=free time T.
But should between unicast symbols and multicast symbol, only insert a frequency pilot sign as can be seen, and the shared time of this frequency pilot sign is the preferred embodiments of the present invention for this free time T.Based on those skilled in the art's general knowledge, anyly all should be protection range of the present invention and contain for inserting frequency pilot sign number and the variation of shared time of frequency pilot sign (the shared time of frequency pilot sign is less than or equal to free time T and gets final product).Two frequency pilot signs are inserted in for example variation of following mode between unicast symbols and multicast symbol, these two shared times of frequency pilot sign are less than or equal to this section free time T; Perhaps only between unicast symbols and multicast symbol, insert a frequency pilot sign, but shared time of this frequency pilot sign is less than free time T, that is to say after having increased frequency pilot sign, also leave certain free time between newly-increased frequency pilot sign and the multicast symbol.
In order better to understand the present invention, below just explain how to determine frequency pilot sign with concrete example.
1, when mixed carrier MBMS unicast service adopted two unicast symbols, free time T was 23.4375us between unicast symbols and the multicast symbol.Because subcarrier spacing F is 15KHz, therefore Tdata can select 23.24us (corresponding 2 subcarriers), 16.67us (corresponding 4 subcarriers) or 8.335us (corresponding 8 subcarriers) etc., wherein as the preferred embodiment of the invention, selection Tdata is 16.67us, and to obtain Tcp according to free time T be 23.4375us-16.67us=6.7675us.The structure of this frequency pilot sign is as follows:
This moment, each frequency pilot sign was at the subcarrier of the corresponding 60KHz of frequency domain, and such pilot tone is at the point of frequency domain four subcarriers with regard to corresponding clean culture frequency domain.As shown in Figure 5, mixed carrier MBMS subframe structure figure behind the increase frequency pilot sign when adopting two unicast symbols for unicast service of the present invention, this Figure only shows the situation of single antenna, if adopt a plurality of antennas, then also need pilot tone is carried out sign indicating number branch orthogonalization process, for example multiply by corresponding orthogonal code or scrambler, can repeat no more by concrete antenna decision herein for multiply by which kind of orthogonal code or scrambler.
2, when mixed carrier MBMS unicast service adopted three unicast symbols, free time T was 35.4167us between unicast symbols and the multicast symbol.Can select Tdata equally is 22.2222us, and Tcp is 13.1945us.Certainly should be from foregoing description the above-mentioned as can be seen preferred embodiment of the present invention that is chosen as, for example also can select Tdata is 11.1111, Tcp is 24.3056us; Perhaps selecting Tdata is 22.2222us, and Tcp also leaves certain free time less than 13.1945us between frequency pilot sign that increases and multicast symbol.As the preferred embodiments of the present invention, selection Tdata is 22.2222us, and Tcp is the frequency pilot sign of the OFDM symbol of 13.1945us as increase, and the structure of this frequency pilot sign is as follows:
This moment, each frequency pilot sign was at the subcarrier of the corresponding 45KHz of frequency domain, and such pilot tone is at the point of frequency domain three subcarriers with regard to corresponding clean culture frequency domain.Mixed carrier MBMS subframe structure figure behind the increase frequency pilot sign when as shown in Figure 6, adopting three unicast symbols for unicast service of the present invention.Also only show the situation of single antenna equally in the figure,, then also need pilot tone is carried out sign indicating number branch orthogonalization process, for example multiply by corresponding orthogonal code or scrambler if adopt a plurality of antennas.
Step S403, E-NodeB are to UE MBMS transmission business, and UE resolves corresponding frequency pilot sign and carries out channel estimating from the MBMS subframe.UE not only can be resolved to original frequency pilot sign in embodiments of the present invention, can also be resolved to the frequency pilot sign that the present invention increases between unicast symbols and multicast symbol.UE just can carry out channel estimating according to the pilot tone that increases like this, thereby improves the accuracy of UE channel estimating.Wherein, UE can use this newly-increased pilot tone to carry out channel estimating separately, also can use the pilot tone that increases newly and the mode of existing pilot tone interpolation to carry out channel estimating.The present invention is when interpolation, and estimated channel is given different weights apart from the position of pilot tone as required, or adopts different interpolation algorithms, and the present invention is for selecting which kind of interpolation algorithm and indefinite.
For example, for mixed carrier MBMS subframe structure figure behind the increase frequency pilot sign shown in Figure 5, UE just can use existing pilot tone to obtain channel estimating for first unicast symbols, thereby just can adopt newly-increased pilot tone to do the accuracy that channel estimating improves the UE channel estimating for second unicast symbols.The subcarrier of corresponding four unicast symbols of certain this moment of channel estimating; Perhaps, UE can also use existing pilot tone and the mode that increases the pilot tone interpolation newly to obtain the channel estimating of corresponding subcarrier, and same this moment, a channel estimating of newly-increased pilot tone was equally also wanted four subcarriers of correspondence.Again for example, for mixed carrier MBMS subframe structure figure behind the increase frequency pilot sign shown in Figure 6, thereby the 3rd unicast symbols just can select to adopt newly-increased pilot tone to do the accuracy that channel estimating improves the UE channel estimating; Same this UE also can use existing pilot tone and the mode that increases the pilot tone interpolation newly to obtain the channel estimating of corresponding subcarrier.
As shown in Figure 7, improve the system construction drawing of channel estimation accuracy of user equipment for the present invention, this system comprises E-NodeB 100 and at least one UE 200, wherein, E-NodeB100 is used for the free time T between definite MBMS subframe unicast symbols and the multicast symbol, utilize this free time T to increase frequency pilot sign between unicast symbols and multicast symbol, the subcarrier number of frequency pilot sign correspondence determined by described free time T, and by this E-NodeB 100 to UE 200 MBMS transmission business; UE 200 resolves corresponding frequency pilot sign and carries out channel estimating after the MBMS business that receives E-NodeB 100 transmission from the MBMS subframe.UE 200 not only can be resolved to original frequency pilot sign in this embodiment, can also be resolved to the frequency pilot sign that E-NodeB of the present invention increases between unicast symbols and multicast symbol.UE 200 not only can carry out channel estimating according to the frequency pilot sign that increases like this, as adopting the pilot tone that increases to carry out channel estimating to second unicast symbols among Fig. 5; UE 200 can also together carry out channel estimating according to the pilot tone and the original pilot tone that increase, for example uses the mode that increases frequency pilot sign and existing frequency pilot sign interpolation to carry out channel estimating.
Wherein, E-NodeB 100 of the present invention comprises that free time determination module 110, frequency pilot sign increase module 120 and the professional transport module 130 of MBMS, wherein, determination module 110 is used for determining free time T between unicast symbols and the multicast symbol according to the number of MBMS subframe unicast symbols free time; Frequency pilot sign increases module 120 and is used to utilize free time T to increase frequency pilot sign between unicast symbols and multicast symbol, and the subcarrier number of this frequency pilot sign correspondence is determined by described free time T; The professional transport module 130 of MBMS is used for the UE 200 MBMS transmission business in the sub-district.
As preferred version of the present invention, the frequency pilot sign that needs increase can be pre-set, and be kept among the E-NodeB 100, as for the situation that two unicast symbols are arranged in the MBMS subframe, frequency pilot sign can adopt the OFDM symbolic construction of 6.7675us+16.67us, and this structure is kept among the E-NodeB 100; For the situation that three unicast symbols are arranged in the MBMS subframe, frequency pilot sign can adopt the OFDM symbolic construction of 13.1945us+22.222us, and also does corresponding agreement in UE 200.So no matter to be the number that 200 need of E-NodeB 100 or UE are known unicast symbols in the MBMS subframe, the structure of the frequency pilot sign that can obtain increasing.Therefore frequency pilot sign increase module 120 can comprise frequency pilot sign preservation submodule 121, and frequency pilot sign reading submodule 122 and frequency pilot sign add submodule 123.Wherein, frequency pilot sign is preserved submodule 121 and is used to preserve frequency pilot sign to be added, reaches the corresponding relation of unicast symbols number in frequency pilot sign and the MBMS subframe; Frequency pilot sign reading submodule 122 is used for preserving module according to MBMS subframe unicast symbols number from frequency pilot sign and reads corresponding frequency pilot sign; Frequency pilot sign adds submodule 123 and is used for the frequency pilot sign that the frequency pilot sign reading submodule reads was added in free time between unicast symbols and the multicast symbol.
Wherein, UE 200 of the present invention comprises the professional receiver module 210 of MBMS, frequency pilot sign parsing module 220 and channel estimation module 230, and the professional receiver module 210 of MBMS is used to receive the MBMS business of E-NodeB 100 transmission; Frequency pilot sign parsing module 220 is used for resolving frequency pilot sign from the MBMS subframe that the professional receiver module 210 of MBMS receives, and comprises frequency pilot sign and original frequency pilot sign of increase; Channel estimation module is used to utilize the pilot tone of increase to carry out channel estimating, and perhaps pilot tone and original pilot tone of the increase of resolving according to frequency pilot sign parsing module 220 utilize interpolation algorithm to carry out channel estimating.
The present invention increases frequency pilot sign by utilizing the free time T in the MBMS subframe between unicast symbols and multicast symbol, thereby makes UE can utilize the pilot tone of increase to carry out channel estimating, reaches the purpose of the accuracy that improves the UE channel estimating.And that utilization of the present invention is the unspecified free time T of 3GPP, need not existing MBMS subframe structure is made any change, and therefore method and apparatus provided by the invention can improve the accuracy of UE channel estimating simply, efficiently.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (13)
1. a method that improves channel estimation accuracy of user equipment is characterized in that, may further comprise the steps:
Determine the free time T between the unicast symbols and multicast symbol in the multi-media broadcasting service MBMS subframe; Wherein, the free time T between unicast symbols and the multicast symbol is specially in described definite MBMS subframe: the number according to unicast symbols in the described MBMS subframe is determined described free time T;
Utilize described free time T to increase frequency pilot sign between described unicast symbols and described multicast symbol, the subcarrier number of described frequency pilot sign correspondence is determined by described free time T;
To user equipment (UE) MBMS transmission business, described UE utilizes the pilot tone that increases to carry out channel estimating.
2. improve the method for channel estimation accuracy of user equipment according to claim 1, it is characterized in that, the described free time T that utilizes increases frequency pilot sign between described unicast symbols and described multicast symbol, further may further comprise the steps:
The shared time T data of data division that determines described frequency pilot sign according to subcarrier spacing F and described free time T, wherein Tdata=1/ (N * F), and Tdata＜free time T, N is a positive integer;
Select the shared time T cp of described frequency pilot sign CP part according to the shared time T data of the data division of described frequency pilot sign.
3. as the method for raising channel estimation accuracy of user equipment as described in the claim 2, it is characterized in that, describedly select the shared time T cp of described CP part to be specially according to the shared time T data of data division:
Tcp=free time T-Tdata.
4. as the method for raising channel estimation accuracy of user equipment as described in the claim 2, it is characterized in that,
When two unicast symbols were arranged in the MBMS subframe, it was 6.7675us that described frequency pilot sign adopts Tcp, and Tdata is the OFDM symbolic construction of 16.67us.
5. as the method for raising channel estimation accuracy of user equipment as described in the claim 2, it is characterized in that,
When three unicast symbols were arranged in the MBMS subframe, it was 13.1945us that described frequency pilot sign adopts Tcp, and Tdata is the OFDM symbolic construction of 22.222us.
6. improve the method for channel estimation accuracy of user equipment according to claim 1, it is characterized in that, described UE utilizes the pilot tone that increases to carry out channel estimating and is specially:
Described UE utilizes the pilot tone of described increase to carry out channel estimating, or described UE uses the pilot tone of described increase and the mode of existing pilot tone interpolation to carry out channel estimating.
7. improve the method for channel estimation accuracy of user equipment according to claim 1, it is characterized in that, utilizing free time T increases frequency pilot sign between described unicast symbols and described multicast symbol after, further comprising the steps of:
When adopting many antenna transmission, the frequency pilot sign that increases is carried out sign indicating number branch orthogonalization process.
8. a system that improves channel estimation accuracy of user equipment is characterized in that, comprises evolution base station E-NodeB and at least one user equipment (UE),
Described E-NodeB, be used for the free time T between definite MBMS subframe unicast symbols and the multicast symbol, utilize described free time T between described unicast symbols and described multicast symbol, to increase frequency pilot sign, the subcarrier number of described frequency pilot sign correspondence is definite by described free time T, and to UE MBMS transmission business; Wherein, described E-NodeB is used for determining described free time T according to the number of described MBMS subframe unicast symbols;
Described UE is used to receive the MBMS business of described E-NodeB transmission, and utilizes the pilot tone of described increase to carry out channel estimating, or uses the pilot tone of described increase and the mode of existing pilot tone interpolation to carry out channel estimating.
9. as the system of raising channel estimation accuracy of user equipment as described in the claim 8, it is characterized in that,
When two unicast symbols were arranged in the MBMS subframe, the frequency pilot sign of described increase adopted the OFDM symbolic construction of 6.7675us+16.67us;
When three unicast symbols were arranged in the MBMS subframe, the frequency pilot sign of described increase adopted the OFDM symbolic construction of 13.1945us+22.222us.
10. an evolution base station E-NodeB is characterized in that, comprises that free time determination module, frequency pilot sign increase module and the professional transport module of MBMS,
Described free time determination module, be used for determining free time T between unicast symbols and the multicast symbol according to the number of MBMS subframe unicast symbols;
Described frequency pilot sign increases module, is used to utilize described free time T to increase frequency pilot sign between described unicast symbols and described multicast symbol, and the subcarrier number of described frequency pilot sign correspondence is determined by described free time T;
The professional transport module of described MBMS is used for the UE MBMS transmission business in the sub-district.
11., it is characterized in that described frequency pilot sign increases module and comprises that frequency pilot sign preserves submodule as evolution base station E-NodeB as described in the claim 10, frequency pilot sign reading submodule and frequency pilot sign add submodule,
Described frequency pilot sign is preserved submodule, is used to preserve frequency pilot sign to be added, reaches the corresponding relation of the number of unicast symbols in described frequency pilot sign to be added and the described MBMS subframe;
Described frequency pilot sign reading submodule is used for preserving module according to described MBMS subframe unicast symbols number from described frequency pilot sign and reads corresponding frequency pilot sign;
Described frequency pilot sign adds submodule, is used for the frequency pilot sign that described frequency pilot sign reading submodule reads was added in free time between described unicast symbols and the described multicast symbol.
12., it is characterized in that the corresponding relation of unicast symbols number is specially in described frequency pilot sign and the described MBMS subframe as evolution base station E-NodeB as described in the claim 11:
When two unicast symbols were arranged in the MBMS subframe, the frequency pilot sign of described increase adopted the OFDM symbolic construction of 6.7675us+16.67us;
When three unicast symbols were arranged in the MBMS subframe, the frequency pilot sign of described increase adopted the OFDM symbolic construction of 13.1945us+22.222us.
13. a user equipment (UE) is characterized in that, comprises the professional receiver module of MBMS, frequency pilot sign parsing module and channel estimation module,
The professional receiver module of described MBMS is used to receive the MBMS business that E-NodeB transmits;
Described frequency pilot sign parsing module is used for resolving pilot tone and the original pilot tone that increases from the MBMS subframe that the professional receiver module of described MBMS receives; Wherein, the pilot tone that increases is to add between unicast symbols and multicast symbol according to the free time T between unicast symbols and the multicast symbol, the subcarrier number of frequency pilot sign correspondence is determined that by described free time T described free time T is determined by the number of unicast symbols in the described MBMS subframe;
Described channel estimation module is used to utilize the pilot tone of the described increase that described frequency pilot sign parsing module resolves to carry out channel estimating, or uses the pilot tone of described increase and the mode of original pilot tone interpolation to carry out channel estimating.
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| CN101027882A (en) * | 2004-09-24 | 2007-08-29 | 高通股份有限公司 | Method and apparatus for communication in a system employing differing transmission protocols |
| CN101035106A (en) * | 2007-04-02 | 2007-09-12 | 重庆邮电大学 | Method for using the pilot symbol and asymmetric pilot frequency to carry out the combined channel estimation |
| EP1892892A1 (en) * | 2006-08-24 | 2008-02-27 | Nokia Siemens Networks Gmbh & Co. Kg | Method and network entities for supporting MBMS service in a LTE radio communication network |
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| CN101027882A (en) * | 2004-09-24 | 2007-08-29 | 高通股份有限公司 | Method and apparatus for communication in a system employing differing transmission protocols |
| EP1892892A1 (en) * | 2006-08-24 | 2008-02-27 | Nokia Siemens Networks Gmbh & Co. Kg | Method and network entities for supporting MBMS service in a LTE radio communication network |
| CN101035106A (en) * | 2007-04-02 | 2007-09-12 | 重庆邮电大学 | Method for using the pilot symbol and asymmetric pilot frequency to carry out the combined channel estimation |
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