CN101420745B - Channel quality indication regulation method for SDMA schema conversion - Google Patents

Abstract

The invention discloses a channel quality indication adjusting method while switching space division multiple address modes. The method comprises the following steps: receiving a channel quality indication reported by a first user, and acquiring various scheduling users while the channel quality indication is transmitted in a high-speed downlink shared channel; respectively obtaining a channel estimation matrix, a shaped vector and a code channel transmission power of the first user and various scheduling users; obtaining an estimated power according to a signal-to-noise corresponding to the channel quality indication, and the channel estimation matrix, the shaped vector and the code channel transmission power of the first user and various scheduling users; computing an adjustment signal-interference-noise ratio of the first user in a target mode; and obtaining an adjusted value of the channel quality indication of the first user in the target mode. The method effectively relieves theinfluence on TRFC selection of MAC-hs while switching between two modes and keeps CQI reliability, and the TDD HSDPA system selects a proper TFRC, thus improving transmission efficiency of a MAC-hs data block.

Description

A kind of channel quality indication adjusting method of space division multiple access mode conversion

Technical field

The present invention relates to a kind of TDD (Time Division Duplexing, time division duplex) SDMA of communication system (Spatial Division Mutiple Access, space division multiple access) method, in particular, a kind of third generation mobile field HDSPA (High-Speed Downlink Packet Access, high-speed downlink packet inserts) CQI (Channel Quality Indicator, channel quality indication) method of adjustment under the outdoor environment of system when SDMA and non-SDMA mode switch.

Background technology

HSDPA adopts the down channel of sharing to carry out transfer of data, can reach higher data throughout, be suitable for the high bursts of traffic that the instantaneous rate of advancing is down had relatively high expectations, and can effectively reduce the degree and the propagation delay time of data re-transmission, be particularly suitable for as asymmetric data services of various up-downgoings such as video request program, surfing on the net.In 3GPP Release 5, TD-SCDMA has been formulated corresponding HSDPA technical specification, define high speed descending sharing channel (HS-DSCH) on the down direction and finished downlink data transmission at a high speed.As the transmission channel that a time shares, it is mapped to a redetermination physical down data channel---high-speed physical downlink shared channel (HS-PDSCH) (HS-PDSCH).

The modulation system of HSDPA adopts QPSK and 16QAM, and uses the multiple code rate of rate-matched mechanism realization more flexibly.For example, because the terminal of TD-SCDMA all has multiple different TBS (Transport Block Set, transport block set), like this, the user nearer apart from the base station can be assigned with higher modulation levels and higher code rate, as the code check of 16QAM and R=3/4; And can be assigned with lower modulation levels and code rate near the user of cell edge, as the code check of QPSK and R=1/2.

And HSDPA has adopted channel quality indication (CQI), is used to help Node B to select suitable modulation and coded system according to the residing channel condition of UE, and UE (user terminal) need give Node B with the quality information feedback that receives.This quality information is the transfer resource that the following secondary data of UE suggestion sends, and comprises TBS size, modulation system etc.Node B selects suitable transformat according to the CQI of UE.CQI is a very important feedback information, is used to indicate current channel quality.Channel estimating is finished at the UE end, can be by measuring PCCPCH (Primary Common ControlPhysical Channel, Primary Common Control Physical Channel) RSCP/ISCP (received signal codepower/interference signal code power, the interference after the power/despreading of letter of acceptance number on the received signal) carries out channel estimating.According to estimated result, UE chooses appropriate C QI according to known HS-PDSCH resource allocation status and feeds back.CQI needs very high reliability equally, because the NodeB transformat that decision sends according to CQI next time.The coding of CQI can be divided into RTBS (recommending the transmission block size) and RMF (recommendation modulation format).RTBS adopts the R-M coding of similar TFCI (transformat combination indication), and RMF can adopt simple repeated encoding to finish.

For TD-SCDMA HSDPA SDMA system, because the time-varying characteristics of user's mobile and channel, may make the user become non-SDMA user from the SDMA pattern, this is because variation has taken place the sky branch characteristic of it and other excited users, perhaps experience opposite process, simultaneously, because the empty some users that divide to the shared effect of power, make that also there is certain saltus step in CQI when switching; In addition, in general, the NodeB side is that benchmark carries out Filtering Processing to CQI with non-SDMA, so, when having above-mentioned two processes, need revise, otherwise just may have certain CQI tracking error, thereby make MAC-hs (Media Access Control-high speed CQI, deviation appears in the TRFC high speed media access control) (Transport Format Resource Combination, transmission format resource combination) when selecting.

Promptly under the SDMA system, the user may carry out mode switch between SDMA pattern and non-SDMA mode transfer; And when conversion, user's power or the interference type of receiving all might change, especially under outdoor environment, SDMA user can share gross power, bigger variation will take place in user's solid size road power when changing mutually under SDMA pattern and two kinds of situations of non-SDMA pattern, and the CQI that UE reports can not embody this information, if directly adopt this CQI must cause deviation, NodeB is not as adjusting according to the scheduling situation, and then final body influences in the deterioration of HSDPA throughput of system now.

Therefore, there is defective in prior art, needs to improve.

Summary of the invention

The object of the present invention is to provide a kind of channel quality indication adjusting method of space division multiple access mode conversion, when being used between SDMA pattern and non-SDMA mode transfer, carrying out mode switch, report adjusted CQI information, avoid producing the CQI tracking error.

Technical scheme of the present invention is as follows:

A kind of channel quality indication adjusting method of space division multiple access mode conversion, it may further comprise the steps: the channel quality indication of A1, reception first reporting of user obtains its each dispatched users when high speed descending sharing channel transmission of correspondence; A2, obtain channel estimate matrix, figuration vector, the code channel transmitting power of described first user and each dispatched users respectively; A3, calculating estimating power; A4, calculate the adjustment Signal to Interference plus Noise Ratio of described first user at target pattern; A5, obtain described first user at the channel quality of described target pattern indication adjusted value.

Described method of adjustment, wherein, after steps A 5, execution in step A6 also: judge that the described first user's communications mode switch is described target pattern, then according to described channel quality indication adjusted value, and the code channel number that distributes when being scheduled of described first user, obtain transmitting the transport block set of use, selecting modulation mode.

Described method of adjustment, wherein, further comprising the steps of in the steps A 2: to up following special physical channel, carry out channel estimating, obtain each up dedicated physical channel symbol average energy in measuring period of following of each user, forming length is the channel characteristics vector of port number, as described channel estimate matrix.

Described method of adjustment, wherein, further comprising the steps of in the steps A 2: according to each user's described channel estimate matrix, calculate each user's normalized spatial correlation matrix, respectively each space channel correlation matrix is carried out characteristic value decomposition, select the described figuration vector of the pairing characteristic vector of each eigenvalue of maximum as each user.

Described method of adjustment, wherein, specifically may further comprise the steps in the steps A 5: adopt pure link level simulation to obtain the relation of Signal to Interference plus Noise Ratio, Block Error Rate and transport block set, transport block set during the target Block Error Rate that obtains reaching according to described adjustment Signal to Interference plus Noise Ratio, and obtain the described channel quality indication adjusted value of described first user at described target pattern.

Described method of adjustment, wherein, further comprising the steps of in the steps A 1: as to judge that described first user converts the non-SDMA pattern to from space division multiple access mode, obtain its each dispatched users when the high speed descending sharing channel transmission of correspondence; And further comprising the steps of in the steps A 2: the transmitting power that adopts each user is as described code channel transmitting power.

Described method of adjustment, wherein, specifically may further comprise the steps in the steps A 3: the Signal to Interference plus Noise Ratio of indicating corresponding code channel according to described channel quality, and the channel estimate matrix of described first user and each dispatched users, figuration vector, code channel transmitting power, adopt first to pre-set formula and calculate described estimating power; Wherein, described Signal to Interference plus Noise Ratio obtains according to the transport block set of described channel quality indication and the code channel number that takies; And, specifically may further comprise the steps in the steps A 4:, adopt second to pre-set formula and calculate the adjustment Signal to Interference plus Noise Ratio of described first user when the non-SDMA pattern according to disturbing and described estimating power between the sum of spreading factor, described first user's code channel transmitting power, described first user and each dispatched users, non-SDMA user's code channel.

Described method of adjustment wherein, according to channel estimate matrix, figuration vector, the code channel transmitting power of described first user and each dispatched users, adopts the 3rd to pre-set formula and calculate between non-SDMA user's code channel and disturb.

Described method of adjustment, wherein, further comprising the steps of in the steps A 1: as to judge that described first user becomes space division multiple access mode from the non-SDMA mode switch, then obtain each dispatched users that the target space division multiple access user with described first user dispatches simultaneously; And, further comprising the steps of in the steps A 2: as to adopt the code channel of the first empty grouping at the described first user place to share power divided by the described empty number of users that divides grouping, as described code channel transmitting power.

Described method of adjustment wherein, specifically may further comprise the steps in the steps A 3: obtain estimating power according to thermal noise power and adjacent area interference power calculation; And, specifically may further comprise the steps in the steps A 4:, adopt the 4th to pre-set formula and calculate the adjustment Signal to Interference plus Noise Ratio of described first user when space division multiple access mode according to the sum of spreading factor, described first user's code channel transmitting power, described first empty the branchs grouping user, described first empty other users' of grouping interference, the interference and the described estimating power of other sky branch grouping user.

Adopt such scheme, the present invention adjusts CQI when SDMA and non-SDMA switch by the user; In the time of can alleviating two kinds of mode switch effectively the TRFC of MAC-hs is selected the influence of generation, thereby make CQI keep certain reliability; And make TDD HSDPA system select suitable TFRC, thereby improved the efficiency of transmission of MAC-hs data block.

Description of drawings

Fig. 1 is the CQI adjustment schematic diagram of SDMA of the present invention to non-SDMA;

Fig. 2 is the CQI adjustment schematic diagram of non-SDMA of the present invention to SDMA.

Embodiment

Below preferred embodiment of the present invention is described in detail.

As depicted in figs. 1 and 2, the invention provides a kind of channel quality indication adjusting method of space division multiple access mode conversion, be the CQI method of adjustment of user when SDMA and non-SDMA conversion, TRFC to MAC-hs when this method can be alleviated two kinds of mode switch to a certain extent selects influence, thereby make CQI keep certain reliability, it specifically may further comprise the steps.

The channel quality indication of A1, reception first reporting of user obtains its each dispatched users when high speed descending sharing channel transmission of correspondence.For example, judge that described first user adopts the indication of space division multiple access mode reporting channel quality,, obtain its each dispatched users when the high speed descending sharing channel transmission of correspondence then according to described channel quality indication; Perhaps, judge that described first user becomes space division multiple access mode from the non-SDMA mode switch, then obtain each dispatched users that the target space division multiple access user with described first user dispatches simultaneously.

A2, obtain channel estimate matrix, figuration vector, the code channel transmitting power of described first user and each dispatched users respectively.

Wherein, described channel estimate matrix can obtain in the following way: to up following special physical channel, carry out channel estimating, obtain each up dedicated physical channel symbol average energy in measuring period of following of each user, forming length is the channel characteristics vector of port number, as described channel estimate matrix.

Wherein, described figuration vector can obtain in the following way: according to each user's described channel estimate matrix, calculate each user's normalized spatial correlation matrix, respectively each space channel correlation matrix is carried out characteristic value decomposition, select the described figuration vector of the pairing characteristic vector of each eigenvalue of maximum as each user.

A3, calculating estimating power; For example, indicate the Signal to Interference plus Noise Ratio of corresponding code channel according to described channel quality, and the channel estimate matrix of described first user and each dispatched users, figuration vector, code channel transmitting power, calculate described estimating power; Perhaps, obtain described estimating power according to thermal noise power and adjacent area interference power calculation.

For example, described first user's described estimating power P _{Noise_user1}Be thermal noise power and adjacent area interference power sum.

For example, specifically can may further comprise the steps in the steps A 3: the Signal to Interference plus Noise Ratio (SINR that obtains corresponding code channel according to the transport block set and the code channel number that takies of described channel quality indication, Signal toInterference plus Noise Ratio, also claim Signal to Interference plus Noise Ratio), and the channel estimate matrix of described first user and dispatched users thereof, code channel transmitting power, calculate described estimating power.

A4, calculate the adjustment Signal to Interference plus Noise Ratio of described first user at target pattern.

For example, specifically can may further comprise the steps in the steps A 4: according to disturbing between the sum of spreading factor, described first user's code channel transmitting power, described first user and each dispatched users, non-SDMA user's code channel and described estimating power calculates the adjustment Signal to Interference plus Noise Ratio of described first user when the non-SDMA pattern.

Wherein, can adopt the channel estimate matrix, figuration vector, code channel transmitting power of described first user and each dispatched users to calculate between non-SDMA user's code channel disturbs.

A5, obtain described first user at target pattern corresponding channel quality indication adjusted value, target pattern can be space division multiple access mode or non-SDMA pattern.

For example, specifically can may further comprise the steps in the steps A 5: adopt pure link level simulation to obtain the relation of Signal to Interference plus Noise Ratio, Block Error Rate and transport block set, transport block set when adjusting the target Block Error Rate that Signal to Interference plus Noise Ratio obtains reaching, and obtain described first user corresponding channel quality indication adjusted value under target pattern.Wherein, the relation of described Signal to Interference plus Noise Ratio, Block Error Rate and transport block set adopts tables of data, database or other modes to realize.

Perhaps, an embodiment is, after steps A 5, can also execution in step A6: judge that the described first user's communications mode switch is described target pattern, for example, convert the non-SDMA pattern to from space division multiple access mode, perhaps, become space division multiple access mode from the non-SDMA mode switch; Then according to described channel quality indication adjusted value, and the code channel number that distributes when being scheduled of described first user, obtain transmitting the transport block set of use, selecting modulation mode.

To above-mentioned each embodiment, can comprise the step of following execution mode.

A kind of execution mode preferably of above-mentioned each embodiment is, can also may further comprise the steps in the steps A 1: judge that described first user converts the non-SDMA pattern to from space division multiple access mode, then, obtain its each dispatched users when the high speed descending sharing channel transmission of correspondence according to the channel quality indication; At this moment, further comprising the steps of in the steps A 2: the transmitting power that adopts each user is as described code channel transmitting power.

Be more preferably, at this moment, specifically can may further comprise the steps in the steps A 3: the Signal to Interference plus Noise Ratio of indicating corresponding code channel according to described channel quality, and the channel estimate matrix of described first user and each dispatched users, figuration vector, code channel transmitting power, adopt first to pre-set formula and calculate estimating power; Wherein, described Signal to Interference plus Noise Ratio can obtain according to the transport block set of described channel quality indication and the code channel number that takies.

And, specifically may further comprise the steps in the steps A 4:, adopt second to pre-set formula and calculate the adjustment Signal to Interference plus Noise Ratio of described first usefulness product when the non-SDMA pattern according to disturbing and described estimating power between the sum of spreading factor, described first user's code channel transmitting power, described first user and each dispatched users, non-SDMA user's code channel.

On this basis, can also be according to channel estimate matrix, figuration vector, the code channel transmitting power of described first user and each dispatched users, adopt the 3rd to pre-set formula and calculate between non-SDMA user's code channel and disturb.

The another kind of above-mentioned each embodiment execution mode preferably is, can also may further comprise the steps in the steps A 1: judge that described first user becomes space division multiple access mode from the non-SDMA mode switch, then obtain each dispatched users that the target space division multiple access user with described first user dispatches simultaneously; At this moment, further comprising the steps of in the steps A 2: as to adopt the code channel of the first empty grouping at the described first user place to share power divided by the described empty number of users that divides grouping, as described code channel transmitting power.

Be more preferably, at this moment, specifically may further comprise the steps in the steps A 3: obtain estimating power according to thermal noise power and adjacent area interference power calculation; For example, estimating power is thermal noise power and adjacent area interference power sum.

And, specifically may further comprise the steps in the steps A 4:, adopt the 4th to pre-set formula and calculate the adjustment Signal to Interference plus Noise Ratio of described first user when space division multiple access mode according to the sum of spreading factor, described first user's code channel transmitting power, described first empty the branchs grouping user, described first empty other users' of grouping interference, the interference and the described estimating power of other sky branch grouping user.

So just can adjust CQI according to the change over condition of scheduling situation and SDMA communication pattern, thereby avoid producing the CQI tracking error, help Node B to select suitable modulation and coded system, in case deviation appears when selecting in the TRFC of MAC-hs according to the residing channel condition of UE.

Below in conjunction with accompanying drawing, further specify and realize how technical scheme of the present invention carries out the adjustment of CQI.As shown in Figure 1, situation (1) is: when the user was transferred to non-SDMA pattern by the SDMA pattern, when adopting SDMA to report CQI before, NodeB just calculated the adjusted value of CQI, the value when making it to embody non-SDMA; Like this, when the user is transferred to non-SDMA pattern by the SDMA pattern, as when being converted to the CDMA pattern that non-NULL divides, adopt adjusted CQI just can avoid the tracking error of CQI; As shown in Figure 2, situation (2) is: when the user changed the SDMA pattern into by non-SDMA, CQI also carried out certain adjustment, the CQI value when making it to embody SDMA.

As shown in Figure 1, for situation (1), concrete steps are described as follows, and suppose that user 1 original SDMA of employing reports CQI, will transfer non-SDMA pattern to by the SDMA pattern.

Step 1:NodeB can note the various information of each dispatched users, the CQI that obtains user user1 reports corresponding HS-DSCH (High Speed Downlink Shared Channel, high speed descending sharing channel) dispatched users in when transmission, suppose the user who therewith dispatches be respectively user2, user3 ... userj..., userN.

Step 2: the figuration vector W that obtains each user ₁, W ₂... W _NThe figuration vector can obtain by the normalized spatial correlation matrix that calculates each user.For example, steps A 2 specifically may further comprise the steps: calculate each user's channel impulse response matrix and amassing of its associate matrix, as each user's normalized spatial correlation matrix, promptly obtain normalized channel space correlation matrix.

For example, if R (i) is the normalized spatial correlation matrix of user i, can adopt following method to obtain, R (i)=channel_correlation (H (i)), wherein, channel_correlation is user's normalization spatial correlation matrix computing function, and correlation matrix normalization is exactly the coefficient correlation normalizing with the channel impulse response of each user between different array antennas, for example adopts formula: R _i=H (i) * H (i) ^H, wherein, H (i) ^HAssociate matrix for H (i).

Be more preferably, step 2 is further comprising the steps of: adopt forgetting factor that each spatial correlation matrix is carried out smoothing processing, be used to prevent that instantaneous channel shake from causing matrix to change violent and make system's instability; When estimating correlation matrix, introduce forgetting factor and can reduce the sensitiveness of algorithm greatly, promptly reduce sensitivity instantaneous correlation matrix to the cycle frequency error.

For example, normalization spatial correlation matrix R (i) is carried out smoothing processing according to following formula, $R\left(i\right)=p*{\stackrel{\‾}{R}}_i+(1-p)R_i;$ Wherein the current channel space correlation matrix of each user is designated as R _i, history value is designated as

Wherein, history value can be initialized as a certain matrix that presets: ${\stackrel{\‾}{R}}_i=R_0,$ The forgetting factor of correlation matrix is designated as p, and the span of forgetting factor is decided according to actual conditions between 0 to 1; In general the high more forgetting factor of user's translational speed is big more, and translational speed is low more more little, can optimize forgetting factor by engineering test or emulation.

Respectively each space channel correlation matrix is carried out characteristic value decomposition then, select the figuration vector of the pairing characteristic vector of each eigenvalue of maximum, i.e. each user's wave beam forming vector as each user.

If when having adopted forgetting factor that each spatial correlation matrix is carried out smoothing processing, then each the space channel correlation matrix after level and smooth is carried out characteristic value decomposition.

Concerning user i, the correlation matrix after level and smooth is carried out characteristic value decomposition, select the shape-endowing weight value W of the characteristic vector of corresponding eigenvalue of maximum as user i _iFor example, the correlation matrix after utilizing smoothly calculates user's Beamforming shape-endowing weight value vector W _i: W _i=beamforming_gen (R _i), generally can decompose acquisition W with eigenvalue of maximum _i, just find eigenvalue of maximum characteristic of correspondence vector as shape-endowing weight value.For example, adopt power method to calculate eigenvalue of maximum, thereby select the characteristic of correspondence vector.

Step 3: because real-time renewal and the preservation of channel estimate matrix also is directly to read here; Obtain the up-to-date channel estimate matrix of each user, H ₁, H ₂..., H _NFor example,, carry out channel estimating, obtain each up dedicated physical channel symbol average energy in measuring period of following of each user up following special physical channel.In the specific implementation, can be by up DPCH (the Dedicated Physical Channel that follows, DPCH) channel estimating draws the symbol average energy of each passage of user in measuring period, and composition length is that the channel characteristics vector of port number reports MAC-hs.With the channel estimate matrix of this channel characteristics vector as this user.

General, each HSDPA follows channel with the up-downgoing of being furnished with a special use per family, and according to this channel, NodeB can obtain the power level information of subscriber channel in real time; And, according to certain user's who receives at each passage up channel impulse response, can estimate this user's symbol energy, just the energy of the impulse response tap of certain passage is strong more represents that then the user is strong more in the signal power of this passage.Wherein, this user's symbol average energy is meant the mean value of this user's symbol energy in a period of time, need average in measuring period.

Step 4: the code channel transmitting power P that obtains each user _User1, P _User2... P _UserNDescribed code channel transmitting power is in the high speed descending sharing channel of described first user's correspondence, each user's code channel transmitting power.

Step 5: the various information according to SINR that reported the CQI correspondence in the past and dispatched users estimate, promptly adopt first to pre-set formula and calculate, and obtain P _{Noise_user1}Estimated value, its was according to reporting the SINR of CQI correspondence and the various information of dispatched users to estimate that this value comprises the influence of thermal noise power and adjacent area interference power in the past; For example, the thermal noise of TD-SCDMA system descending is-104dBm to calculate (K=1.38*10e-23J/K, T are noise temperature 290K, and W is the equivalent noise width, apread spectrum bandwidth 1.28MHz) by KTW.

For P _{Noise_user1}The method of estimated value as follows: the user whenever reports TBS one time, and NodeB then needs to estimate a P according to the TBS (Transport Block Set, transport block set) that reports and channel estimating and scheduling situation _{Noise_user1}, such as obtaining in the following ways.Need to prove P _{Noise_user1}Method of estimation can have multiplely, below only be one of them example.

Suppose that at n TTI (time interval) user 1, user 2 dispatch simultaneously, user 1 and user's 2 channel estimate matrix is respectively H ₁, H ₂, code channel power is respectively: P ₁, P ₂, report TBS and the code channel number that takies to table look-up to obtain corresponding code channel SINR according to user 1 ₁, then described first pre-sets formula can be:

P _{noise_user1}＝f _{noise_estimation}(H ₁，P ₁，H ₂，P ₂，SINR ₁)；

Wherein, function f _{Noise_estimation}Be used for by subscriber channel and SINR information estimating noise power.

For example: ${\mathrm{SINR}}_1=\frac{S1}{I2+P_{\mathrm{noise}\_\mathrm{user}1}}=\frac{g(H_1,P_1)}{g^{\′}(H_2,P_2)+P_{\mathrm{noise}\_\mathrm{user}1}};$

Wherein, g and g ' are calculated signals function and inter-user interference computing function;

Then $P_{\mathrm{noise}\_\mathrm{user}1}=\frac{g(H_1,P_1)}{{\mathrm{SINR}}_1}-g^{\′}(H_2,P_2).$

Step 6: suppose that the number of users that divides with user userl sky is K, other K-1 user is respectively: user2, user3, ... userK, then when user 1 adopts non-SDMA pattern, adopt second to pre-set formula and carry out SINR and estimate, pre-set formula such as described second and be:

${\mathrm{SINR}}_{\mathrm{esti}\_\mathrm{nonsdma}\_\mathrm{user}1}=\frac{\mathrm{SF}*K*P_{\mathrm{user}1}}{I_{\mathrm{non}\_\mathrm{sdma}\_\mathrm{user}1}+P_{\mathrm{noise}\_\mathrm{user}1}}$

Wherein: SF is a spreading factor; P _User1For the user in the solid size road of this HS-DSCH transmitting power, and solid size road power of each empty user of branch equates, just emptyly divides the user to divide available code channel power, i.e. P equally _UserNAll identical, N=1,2,3......K; I _{Non_sdma}Disturb between code channel for non-SDMA user, can be according to channel estimate matrix, figuration vector, the code channel transmitting power of described first user and each dispatched users, adopt the 3rd to pre-set formula and calculate between non-SDMA user's code channel and disturb.Such as, the described the 3rd pre-set formula can for:

I _{non_sdma}＝f _{non_sdma}(W _K+1，...W _N，P _K+1，...P _N，H ₁)；

The concrete computational methods of disturbing between non-SDMA user's code channel can adopt multiple mode to realize that the present invention does not impose any restrictions this.

Step 7: according to SINR _{Esti_nonsdma_user1}Estimation is tabled look-up, and this table is generally obtained by pure link level simulation, by this table, can find the TBS size in the time of can reaching target BLER under certain SINR, the code channel number of distributing according to CQI=TBS/ then, the CQI adjusted value in the time of can drawing corresponding non-SDMA.

Like this, after having obtained the CQI adjusted value, NodeB just can be according to appropriate C QI adjusted value when being scheduled as this user (i.e. first user), for it distributes rational code channel number, be assumed to be RU_number code channel, then CQI*RU number is found out immediate block size, TBS as last transmission, and adopt the QPSK modulation system during less than certain thresholding as TBS/ (RU*88), otherwise then be the 16QAM modulation system, so just finished the mapping of from CQI to TFRC (Transport Formatand Resource Combination, transformat combines with resource).

As shown in Figure 2,, suppose that user 1 converts the SDMA mode to by non-SDMA mode and launches, specify as follows for situation (2).

Step 1: the CQI that obtains user 1 reports corresponding HS-DSCH (high speed descending sharing channel, High Speed Downlink Shared Channel) dispatched users in when transmission, suppose the user who therewith dispatches be respectively user2, user3 ... userj..., userN;

Step 2: the figuration vector W that obtains each user _i, W ₂... W _N

Step 3: obtain the up-to-date channel estimate matrix of each user, H ₁, H ₂... H _N

Step 4: obtain number of users of each empty branch grouping, suppose to have two empty groupings, each grouping has G user, is total to N=2G user, and it is P that the code channel of each grouping is shared power _G1, P _G2

Step 5: obtain P _{Noise_user1}Estimated value, it is according to reporting the SINR of CQI correspondence and the various information of dispatched users to estimate in the past;

Step 6: adopt the 4th to pre-set formula and calculate the adjustment Signal to Interference plus Noise Ratio of described first user when the non-SDMA pattern, for example, it is as follows that the 4th of the SINR estimated value when converting non-SDMA to pre-sets formula:

${\mathrm{SINR}}_{\mathrm{esti}\_\mathrm{sdma}\_\mathrm{user}1}=\frac{\mathrm{SF}*P_{G1}/G}{\mathrm{SF}*I_{\mathrm{sdma}}+I_{\mathrm{non}\_\mathrm{sdma}}+P_{\mathrm{noise}}}$

Wherein: I _SdmaFor estimating with user 1 other SDMA users' on the same group interference power,

I _sdma＝f _sdma(P _G1，W ₁，W ₂，...W _G，H ₁，G)

I _{Non_sdma}For with user 1 not on the same group other all SDMA users' interference power estimate,

I _{non_sdma}＝f _{non_sdma}(P _G2，W _G+1，W _G+2，...W _N，H ₁)

Step 6: according to SINR _{Esti_nonsdma_user1}Estimate to table look-up CQI adjusted value when obtaining corresponding non-SDMA.

Below in conjunction with TD-SCDMA HSDPA system, the concrete enforcement of the technical program is described in further detail: suppose 1: embodiment only provides the processing procedure of non-SDMA to the CQI adjusted value of SDMA, and there have SDMA to arrive non-SDMA to be similar with it, omits here;

Suppose 2: two groups of empty users of branch are arranged, and every group has two users, be designated as respectively ue1, ue2}, ue3ue4}, and the total transmitting power of code channel of each empty grouping is P, some users share power P in the grouping;

Suppose 3: suppose that array antenna has 8 array elements, the channel estimating tap number on each array element is 16, and then the channel estimate matrix of user i is $H\left(i\right)={\left[\begin{array}{c}{h}_{i,\mathrm{1,1}},h_{i,\mathrm{1,2}},...h_{i,\mathrm{1,16}}\\ h_{i,\mathrm{2,1}},h_{i,\mathrm{2,2}},...h_{i,\mathrm{2,16}}\\ ...\\ h_{i,\mathrm{8,1}},h_{i,\mathrm{8,2}},...h_{i,\mathrm{8,16}}\end{array}\right]}_{8*16};$

Suppose 4: each user's shape-endowing weight value is W _i

Suppose 5: heat is made an uproar and the estimated value of adjacent area interference power sum is designated as P _Noise

Be the CQI valuation of example when calculating its SDMA mode with user 1 below:

Step 1: obtain the user list in this dispatching cycle, ue1, ue2, ue3, and acquisition and ue1 user ue2 on the same group share power P, and power P is monopolized in ue3 emission separately on other code channel;

Step 2: obtain each user's shape-endowing weight value vector, W ₁, W ₂, W ₃

Step 3: the up-to-date channel estimate matrix H (1) that obtains user 1;

Step 4: obtain the number of users 2 in the ue1 affiliated space grouping and share transmitting power P on the same group;

Step 5: the SDMA SINR valuation of calculating ue1:

${\mathrm{SINR}}_{\mathrm{sdma}\_\mathrm{ue}1}=\frac{16/2*\mathrm{norm}{(W_1*H\left(1\right))}^{2}P}{16/2*\mathrm{norm}{(W_2*H\left(1\right))}^{2}P+\mathrm{norm}{(W_2*H\left(1\right))}^{2}P+P_{\mathrm{noise}}}$

Norm in the following formula represents the vector norm, and 16 is the spreading factor of HS-PDSCH code channel;

Step 6: obtain SINR according to the SINR-BLER-CQI table _{Sdma_ue1}Corresponding CQI value;

Step 7: jump to step 3, ue2 is carried out identical process obtain its CQI adjusted value.

Can effectively adjust the saltus step of user CQI when SDMA and non-SDMA adjust by the inventive method, make TDD HSDPA system select suitable TFRC, thereby improved the efficiency of transmission of MAC-hs data block.

Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection range of claims of the present invention.

Claims (10)

1. the channel quality indication adjusting method of space division multiple access mode conversion, it may further comprise the steps:

The channel quality indication of A1, reception first reporting of user obtains first user each dispatched users information when the high speed descending sharing channel transmission of correspondence;

A2, obtain channel estimate matrix, figuration vector, the code channel transmitting power of described first user and each dispatched users respectively;

A3, described first user's of calculating estimating power;

A4, calculate the adjustment Signal to Interference plus Noise Ratio of described first user at target pattern;

A5, obtain described first user at the channel quality of described target pattern indication adjusted value.

2. method of adjustment according to claim 1, it is characterized in that, after steps A 5, execution in step A6 also: judge that the described first user's communications mode switch is described target pattern, then according to described channel quality indication adjusted value, and the code channel number that distributes when being scheduled of described first user, obtain transmitting the transport block set of use, selecting modulation mode.

3. method of adjustment according to claim 1, it is characterized in that, further comprising the steps of in the steps A 2: to up following special physical channel, carry out channel estimating, obtain each up dedicated physical channel symbol average energy in measuring period of following of each user, forming length is the channel characteristics vector of port number, as described channel estimate matrix.

4. method of adjustment according to claim 1, it is characterized in that, further comprising the steps of in the steps A 2: according to each user's described channel estimate matrix, calculate each user's normalized spatial correlation matrix, respectively each spatial correlation matrix is carried out characteristic value decomposition, select the described figuration vector of the pairing characteristic vector of each eigenvalue of maximum as each user.

5. method of adjustment according to claim 1, it is characterized in that, specifically may further comprise the steps in the steps A 5: adopt pure link level simulation to obtain the relation of Signal to Interference plus Noise Ratio, Block Error Rate and transport block set, transport block set during the target Block Error Rate that obtains reaching according to described adjustment Signal to Interference plus Noise Ratio, and obtain the described channel quality indication adjusted value of described first user at described target pattern.

6. according to the arbitrary described method of adjustment of claim 1 to 5, it is characterized in that, further comprising the steps of in the steps A 1: as to judge that described first user converts the non-SDMA pattern to from space division multiple access mode, obtain its each dispatched users information when the high speed descending sharing channel transmission of correspondence;

And further comprising the steps of in the steps A 2: the transmitting power that adopts each user is as described code channel transmitting power.

7. method of adjustment according to claim 6, it is characterized in that, specifically may further comprise the steps in the steps A 3: the Signal to Interference plus Noise Ratio of indicating corresponding code channel according to described channel quality, and the channel estimate matrix of described first user and each dispatched users, figuration vector, code channel transmitting power, adopt first to pre-set formula and calculate described estimating power; Wherein, described Signal to Interference plus Noise Ratio obtains according to the transport block set of described channel quality indication and the code channel number that takies;

And, specifically may further comprise the steps in the steps A 4:, adopt second to pre-set formula and calculate the adjustment Signal to Interference plus Noise Ratio of described first user when the non-SDMA pattern according to disturbing and described estimating power between the summation of spreading factor, described first user's code channel transmitting power, described first user and each dispatched users number, non-SDMA user's code channel.

8. method of adjustment according to claim 7 is characterized in that, according to channel estimate matrix, figuration vector, the code channel transmitting power of described first user and each dispatched users, adopts the 3rd to pre-set formula and calculate between non-SDMA user's code channel and disturb.

9. according to the arbitrary described method of adjustment of claim 1 to 5, it is characterized in that, further comprising the steps of in the steps A 1: as to judge that described first user becomes space division multiple access mode from the non-SDMA mode switch, then obtain each dispatched users information that the target space division multiple access user with described first user dispatches simultaneously;

And, further comprising the steps of in the steps A 2: as to adopt the code channel of the first empty grouping at the described first user place to share power divided by the described first empty number of users that divides grouping, as described code channel transmitting power.

10. method of adjustment according to claim 9 is characterized in that, specifically may further comprise the steps in the steps A 3: obtain estimating power according to thermal noise power and adjacent area interference power calculation;

And, specifically may further comprise the steps in the steps A 4:, adopt the 4th to pre-set formula and calculate the adjustment Signal to Interference plus Noise Ratio of described first user when space division multiple access mode according to the sum of spreading factor, described first user's code channel transmitting power, described first empty the branchs grouping user, described first empty other users' of grouping interference, the interference and the described estimating power of other sky branch grouping user.

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