CN101765125B - Method for transmitting uplink detection signal in multi-input and multi-output system - Google Patents
Method for transmitting uplink detection signal in multi-input and multi-output system Download PDFInfo
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Abstract
The embodiment of the invention discloses a method for sending an uplink detection signal in a multi-input and multi-output system, which comprises the following steps: allocating a conditional parameter for a complete channel matrix H to be estimated and a signal transmission parameter for a terminal UE transmitting an uplink detection sounding signal to a base station Node B at the network side; and when the complete channel matrix H to be estimated is determined according to the conditional parameter and when the UE receives the dispatching message from the base station Node B, the uplink detection sounding signal is respectively transmitted to the Node B according the signal transmission parameter by various antennas of the UE. The invention can be used to provide the uplink detection sounding signal for estimating the complete channel matrix H.
Description
Technical field
The present invention relates to the channel estimation technique field of communication system, relate in particular to that a kind of (Multiple Input Multiple Output MIMO) sends the method for uplink detection (sounding) signal in the system at multiple-input and multiple-output.
Background technology
Insert evolution (High Speed Packet Access Plus in high-speed packet; HSPA+) system and Long Term Evolution (Long Term Evolution; LTE) in the future communications system such as system,, introduced the MIMO technology in order further to improve message transmission rate and channel capacity; That is, base station and terminal are launched a plurality of data flow simultaneously or are received a plurality of data flow.Adopted the communication system of MIMO technology to be called mimo system.
A lot of mimo systems also are time division duplex (TDD) systems simultaneously.The up-downgoing channel of TDD system can be used mutually, and promptly the up-downgoing channel has identical characteristic, can replace the characteristic of down channel with the characteristic of up channel.
Under many circumstances; Node B in the mimo system need operate according to the state of each down channel accordingly; For example; Carry out based on singular value decomposition (Singular Value Decomposition, no codebook precoding SVD), antenna mode switch, Adaptive Modulation is decoded (Adaptive Modulationand Coding, AMC) operation such as grade.If this mimo system also is the TDD system simultaneously; Then can utilize the characteristic that the up-downgoing channel can be used mutually in the TDD system; Carry out corresponding uplink channel estimation by Node B according to the signal of each root antenna transmission of UE; To carry out channel vector that uplink channel estimation obtains channel vector to every antenna, and form complete channel matrix H by the channel vector of each down channel, and then operate accordingly according to complete channel matrix H as corresponding down channel.Wherein, each element that carries out the channel vector that uplink channel estimation obtains to every antenna is the channel fading coefficient between all antennas of this every antenna and Node B.
For example; The number of antennas of supposing Node B is N_nb, and the number of antennas of UE is 2, in the no codebook precoding based on SVD; Node B end carries out uplink channel estimation; Obtain the channel matrix H of complete N_nb * 2, Node B carries out SVD to complete channel matrix H and decomposes and to obtain the certain characteristics vector then, and the characteristic vector number is the order of complete channel matrix H.When Node B need walk abreast m downstream data flow of transmission (m is not more than the order of complete channel matrix H); Node B selects the characteristic vector of a corresponding m eigenvalue of maximum from the characteristic vector that SVD decomposites, each characteristic vector of selecting is used for armed data flow of weighting.In like manner, technology such as antenna mode switching and AMC also often need utilize complete channel matrix H to combine factors such as detection algorithm, obtain the signal to noise ratio of each data flow under each antenna mode, and then carry out antenna mode switching and/or AMC operation.
It is thus clear that obtaining complete channel matrix H has great important.
At present; The hardware of considering UE is realized and problem such as cost loss; In the TDD system, the many antennas that limited UE usually can only be used for the while downlink data receiving with the acquisition receive diversity, but can not send upstream data simultaneously; Each antenna of UE only when being assigned with uplink physical channel, could send upstream data.This is for the TDD system that has adopted the MIMO technology, and Node B can only obtain the channel vector of the every antenna of UE through uplink channel estimation in each TTI, and can't obtain complete channel matrix H.
To obtaining this technical problem of complete channel matrix H at synchronization at present; Prior art has proposed two kinds of solutions; The first utilizes the occasion of complete channel matrix H to use the technology that other do not need complete channel matrix H instead at needs; It two is; Send uplink detection (sounding) signal to Node B respectively by each antenna of UE, Node B estimates the channel vector of each antenna respective channels respectively according to the up sounding signal of each antenna transmission, forms complete channel matrix H by each channel vector.
For preceding a kind of method; Utilize the occasion of complete channel matrix H to adopt the technology that only depends on the local channel matrix at needs, can make communication performance that certain loss is arranged, for example; When Node B employing is launched a plurality of data flow based on the no codebook precoding of SVD; Can obtain near optimum in theory performance, if but the technology such as beam shaping (Beam forming) and/or antenna grouping of using instead realize multithread MIMO emission, owing to do not make full use of the full detail of space channel; Can't use optimum equivalent wave beam (beam) territory that whole aerial array provided of Node B to launch data, therefore can cause performances such as array gain and power gain to reduce.Wherein, Beam forming technology only needs the corresponding channel matrix of acquisition UE single antenna can realize multithread MIMO emission.
For a kind of method in back, also do not propose to send the concrete scheme of up sounding signal at present in the prior art, therefore, in fact prior art also can't provide its needed up sounding signal for estimating complete channel matrix H.
Summary of the invention
In view of this, the purpose of the embodiment of the invention is to provide a kind of method of in multi-input multi-output system, sending uplink detection signal, thinks to estimate complete channel matrix H and its needed up sounding signal is provided.
For achieving the above object, the technical scheme of the embodiment of the invention specifically is achieved in that
A kind of method of in multi-input multi-output system, sending uplink detection signal, this method comprises:
The network side configuration needs to estimate the conditional parameter of complete channel matrix H and terminal UE is sent signal transmission parameter from uplink detection sounding signal to base station node B;
When judging needs and estimate that complete channel matrix H and UE receive the scheduling message of base station NodeB according to said conditional parameter, each antenna of said UE sends uplink detection sounding signal to Node B respectively according to said signal transmission parameter.
Visible by technique scheme; The present invention needs to estimate the conditional parameter of complete channel matrix H and terminal UE is sent signal transmission parameter from uplink detection sounding signal to base station node B by the network side configuration; When judging needs according to said conditional parameter and estimate that complete channel matrix H and UE receive the scheduling message of base station node B; Each antenna of said UE sends uplink detection sounding signal to Node B respectively according to said signal transmission parameter, for estimating complete channel matrix H its needed up sounding signal is provided.
And, because the present invention has disposed the conditional parameter that needs to estimate complete channel matrix H by network side in advance, only when judging needs according to said conditional parameter and estimate that complete channel matrix H and UE are scheduled; Just send up sounding signal to Node B; Therefore, needn't be in the time need not estimating complete channel matrix H and UE also send up sounding signal when not being scheduled, can practice thrift the communication resource on the one hand; On the other hand, can be the UE power saving.
Description of drawings
Fig. 1 is the method flow diagram that in mimo system, sends up sounding signal provided by the invention;
Fig. 2 is the detail flowchart that sends the method for up sounding signal in the mimo system provided by the invention.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, to further explain of the present invention.
Fig. 1 is the method flow diagram that in mimo system, sends up sounding signal provided by the invention, and as shown in Figure 1, this method comprises:
In this step, can judge whether needs estimation complete channel matrix H according to said conditional parameter, also can judge whether to need to estimate said complete channel matrix H by Node B by UE.
In this step; In Node B side; Node B receives the sounding signal from each antenna of UE according to said configuration, estimates the corresponding channel vector of each antenna according to the sounding signal of each antenna, forms complete channel matrix H by the channel vector of each antenna.
The present invention proposes; Need to estimate that the conditional parameter of complete channel matrix H can be parameters such as channel quality thresholds or downlink data traffic volume; After then UE receives the scheduling message of Node B; Can trigger this UE according to the channel quality between Node B and the UE by UE and send up sounding signal to Node B, also can be when needs to be estimated complete channel matrix H by Node B, the mode of employing signaling triggers UE and sends up sounding signal to Node B.Wherein, Node B can judge whether needs estimation complete channel matrix H according to the size of channel quality between Node B and the UE or downlink data amount.Node B can define new signaling, sends up sounding signal through this new signaling UE to Node B, also can adopt the state notifying UE that is not used in the existing signaling message to send up sounding signal to Node B.
If UE is after receiving scheduling message; Trigger UE by UE or Node B according to current channel quality and send up sounding signal to Node B; The pre-configured channel quality thresholds of network side then, triggers UE and sends up sounding signal to Node B during greater than said channel quality thresholds at current channel quality; Otherwise, do not trigger UE and send up sounding signal to Node B.
Said network side be generally radio network controller (Radio Network Controller, RNC).Said channel quality thresholds can be a signal to noise ratio SINR threshold value, perhaps with SINR threshold value corresponding channel quality indication information (Channel Quality Indication, CQI) threshold value.
Particularly, the pre-configured channel quality thresholds of network side, UE receives the schedule information that Node B sends on down control channel HS-SCCH; Receive downlink traffic channel HS-PDSCH message according to this schedule information; HS-PDSCH message is measured current channel quality, and whether UE judges current channel quality greater than said channel quality thresholds, if; Then explanation needs to estimate complete channel matrix H, and each antenna of UE sends up sounding signal to Node B respectively.Perhaps; Node B receives the HS-SICH message of UE feedback, whether judges the CQI information of carrying in this HS-SICH message greater than CQI information threshold value, if; Then explanation needs to estimate complete channel matrix H, and Node B notice UE sends up sounding signal to Node B.
Particularly, the problem that relates to of the method for the up sounding signal of transmission provided by the invention comprises: UE sends sounding signal that how concrete form of the concrete opportunity of up sounding signal, up sounding signal, the condition that stops to send up sounding signal, Node B side to confirm to receive sounding signal and reception when specifically by which antenna transmission in the process that is scheduled.Below, in conjunction with the detailed process that sends the method for up sounding signal in the mimo system, be example to send up sounding signal according to this UE of the triggering of the channel quality between Node B and the UE to Node B by UE, the problems referred to above are set forth.
Fig. 2 is the detail flowchart that sends the method for up sounding signal in the mimo system provided by the invention.Wherein, The network side configuration needs to estimate the conditional parameter and the required various signal transmission parameters of the up sounding signal of transmission of complete channel matrix H; In Fig. 2, be that channel quality thresholds is that example describes with said conditional parameter, in the practical application; Said conditional parameter is not limited to channel quality thresholds, and said signal transmission parameter includes but not limited to timer dispatching cycle (Timer) timing length and is used for confirming the up sounding signal of the transmission time parameter on opportunity.As shown in Figure 2, this method comprises:
In this step, among Node B each UE to the communication network that gets into this Node B and covered, the UE that possesses the MIMO ability dispatches, and sends scheduling message through the HS-SCCH channel to the UE that is scheduled.
Carry transport format information, resource allocation information and HARQ information etc. in the said scheduling message.
In this step; Node B is when initial transmission; Adopt the single-stream transmission pattern to send downstream data flow to UE, wait to estimate complete channel matrix H after, carry out the self adaptation switching of single current and multi-streaming transmission mode again; Better can adopt multi-streaming transmission mode to send downstream data flow to UE under the channel condition, said channel condition obtains through complete channel matrix H is assessed.
In this step, UE according to the sequential relationship of the middle regulation of stipulating among the 3GPP standard TS25.221, receives downlink traffic channel HS-PDSCH message according to the physical resource of indicating in the scheduling message in corresponding TTI.
UE measures HS-PDSCH message, obtains current channel quality.Wherein, this current channel quality can be SINR, also can be the CQI information corresponding with SINR.This current channel quality can be the SINR value that records of single or CQI value, also can be the mean value of each SINR that arrives that repeatedly measures or the mean value of CQI.
In step 201～202; If Node B continuous dispatching UE; Then Node B sends a HS-PDSCH message to UE, if Node B semi-continuous scheduling UE passing through the HS-SCCH channel after UE sends scheduling message; Then Node B sends a plurality of HS-PDSCH message passing through the HS-SCCH channel after UE sends scheduling message to UE.
In this step, the signal of network side configuration sends relevant parameter and comprises: be used for confirming the up sounding signal of transmission time parameter, the form of up sounding signal and the condition that stops to send up sounding signal on opportunity.
In this step, each antenna of UE sends up sounding signal to Node B according to said time parameter respectively in the corresponding moment.
Particularly, said time parameter comprises: periodically send the time parameter of up sounding signal, then UE sends the time parameter of up sounding signal according to said periodicity, periodically sends up sounding signal.That is to say that be the opportunity of sending up sounding signal: UE periodically sends up sounding signal according to the time parameter of network side configuration.
Wherein, the said periodicity time parameter that sends up sounding signal comprises: subframe time migration T
Offset, cycle T s and the ascending time slot position of in TTI, sending up sounding signal.UE is according to T
OffsetJudge whether in current TTI, to send up sounding signal to Node B with Ts, that is, UE is according to (2 * SFN+S-T
Offset) mod Ts=0 judges whether in current TTI, to send up sounding signal to NodeB, if above-mentioned equality is set up, then up sounding signal is sent to Node B in the ascending time slot position of the up sounding signal of said transmission in current TTI.Wherein, mod representes modulo operation, T
OffsetWith the value of Ts all are numbers of TTI, SFN is the System Frame Number at current TTI place, S is the subframe numbers at current TTI place, the S value is 0 or 1.
Send up sounding signal opportunity can also for: UE when the Node B feedback HS-SICH message; If have other ascending time slot except the ascending time slot at HS-SICH place in the TTI at feedback HS-SICH message place; Then send up sounding signal and give Node B, and adopt different UE antenna transmission HS-SICH message and send up sounding signal at said ascending time slot.Wherein, UE sends moment of up sounding signal to Node B first after receiving scheduling message should be after UE feeds back HS-SICH message, so that Node B determines whether to receive up sounding signal in the corresponding moment according to the HS-SICH message of UE feedback.NodeB and UE can make an appointment and send the antenna that HS-SICH message adopts.
In addition, if when in TTI, having a plurality of ascending time slot that can send up sounding signal, can adopt different antennas to send up sounding signal on each ascending time slot of up sounding signal can sending.
The form of said sounding signal can be the training sequence code displacement Midamble shift of the free time of distributing for UE.Wherein, can be that UE distributes idle Midamble shift through the spreading factor that UE is set.Wherein, UE can be according to the configuration of the high-level signaling of network side, by each idle Midamble shift of the UE time division multiplexing in the same sub-district.
If in the time slot that sends up sounding signal place, there is HS-SICH message to need feedback, then said sounding signal can also be said HS-SICH message.
The condition that stops to send up sounding signal can be: dispatching cycle, Timer was overtime, and perhaps, the continuous predetermined number contents of UE is judged current channel quality and is not more than said channel quality thresholds.Satisfy stop to send the condition of up sounding signal after, UE does not send up sounding signal to Node B in the current scheduling process.
If dispatching cycle, Timer was overtime, explain that then current dispatching cycle is long, UE can stop to send up sounding signal; This is because generally, the initial data-transmission mode that adopts was single-stream mode or multithread pattern when the complete channel matrix H that in current dispatching cycle, upgrades was generally used for assessing Node B and dispatches UE next time; If current dispatching cycle is long; The complete channel matrix H that then upgrades can't reflect the channel condition when Node B dispatches UE next time, therefore, in current dispatching cycle, needn't estimate complete channel matrix H; And when dispatching UE next time, directly adopt single-stream mode to send downlink data to UE.Wherein, UE receives HS-SCCH message in the continuous dispatching process, perhaps in the semi-continuous scheduling process, receives HS-PDSCH message, and then UE starts or restarts Timer dispatching cycle.
Judge current channel quality k time and be not more than said channel quality thresholds (k is a predetermined value) if UE is continuous; Explain that then the channel quality between UE and the Node B is very poor; Be inappropriate for the employing multi-streaming transmission mode, therefore, needn't estimate complete channel matrix H; Therefore, can stop to send up sounding signal.
The concrete value of k and dispatching cycle Timer timing length can obtain through l-G simulation test or field testing.
In this step, Node B is according to the relevant parameter of network side configuration, confirms the up sounding signal that receives is by which antenna transmission of UE.
Particularly; UE carries current channel quality in the scheduling according to Node B in the HS-SICH message of said Node B feedback; Node B judges that whether the current channel quality that carries in the HS-SICH message of UE feedback is greater than the preset channel quality thresholds value of network side; If then Node B begins to receive the sounding signal from each antenna of UE.
Node B begins to receive after the sounding signal from each antenna of UE, and according to the time parameter of network side configuration, the moment of sending up sounding signal at UE receives the sounding signal that respective antenna sends.
Wherein, Can make an appointment moment of the up sounding signal of each antenna transmission of UE by Node B and UE; Perhaps, agreement UE sends the antenna of up sounding signal employing and the order of the up sounding signal of each antenna transmission first in each dispatching cycle.
For example; UE only adopts 2 antennas usually at present; Adopt at UE under the situation of 2 antennas; UE and Node B can fix on the antenna that sends up sounding signal in each dispatching cycle first approximately, and after sending up sounding signal first, 2 antennas of UE alternately send up sounding signal.
In fact, step 204 among Fig. 2 and step 205 are carried out synchronously, that is to say, UE is in the process of sending up sounding signal, and Node B receives the sounding signal in real time.
In this step, the up sounding signal that Node B sends according to the every antenna of UE estimates the corresponding channel vector of this root antenna of UE, forms complete channel quality matrix H by the channel vector that each antenna of UE is corresponding.Each element of said channel vector is respectively that this root antenna of UE is to the channel fading coefficient between each antenna of Node B.
Node B is in the process of scheduling UE; Before estimating complete channel matrix H; Adopt the single-stream transmission pattern to send data, after estimating complete channel matrix H, assess current channel condition according to complete channel matrix H to UE; Current channel condition according to assessing out switches between single-stream transmission pattern and multi-streaming transmission mode, adopts the transmission mode after switching to send data to UE.Can adopt existing techniques in realizing to assess current channel condition according to complete channel matrix H.
The invention provides the complete scheme that UE sends up sounding signal to Node B, thereby for estimating that complete channel matrix H provides its needed up sounding signal.
And, because the present invention has disposed the conditional parameter that needs to estimate complete channel matrix H by network side in advance, only when judging needs according to said conditional parameter and estimate that complete channel matrix H and UE are scheduled; Just send up sounding signal to Node B; Therefore, needn't be in the time need not estimating complete channel matrix H and UE also send up sounding signal when not being scheduled, can practice thrift the communication resource on the one hand; On the other hand, can be the UE power saving.
Again further; When the up sounding signal of UE transmission is Midamble shift, owing to do not need uplink physical channel can send Midamble shift, therefore; When UE is up sounding signal with Midamble shift; As long as there is ascending time slot, then UE can send up sounding signal, and just sends up sounding signal needn't be assigned with uplink physical channel by the time the time; It is shorter that each antenna of UE all sends the cycle of once up sounding signal; Correspondingly, Node B is also shorter according to the cycle that up sounding signal estimates complete channel matrix H, thereby makes the complete channel matrix H estimate real-time tracking channel space condition well.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention, all any modifications of within spirit of the present invention and principle, being made, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (22)
1. method of in multi-input multi-output system, sending uplink detection signal is characterized in that this method comprises:
The network side configuration needs to estimate the conditional parameter of complete channel matrix H and terminal UE is sent signal transmission parameter from uplink detection sounding signal to base station node B;
When judging needs and estimate that complete channel matrix H and UE receive the scheduling message of base station node B according to said conditional parameter, each antenna of said UE sends uplink detection sounding signal to Node B respectively according to said signal transmission parameter.
2. the method for claim 1 is characterized in that, being judged by UE needs to estimate complete channel matrix H; Said conditional parameter comprises channel quality thresholds;
Judge needs according to said conditional parameter and estimate that complete channel matrix H comprises: UE receives the schedule information that Node B sends at down control channel HS-SCCH; Receive downlink traffic channel HS-PDSCH message according to this schedule information, HS-PDSCH message is measured current channel quality;
Whether UE judges current channel quality greater than said channel quality thresholds, if UE judges needs to estimate complete channel matrix H.
3. the method for claim 1 is characterized in that, judges needs by Node B according to said conditional parameter and estimates complete channel matrix H.
4. method as claimed in claim 3 is characterized in that, said conditional parameter comprises channel quality thresholds or downlink data traffic volume.
5. like claim 2 or 3 described methods, it is characterized in that,
Said signal transmission parameter comprises: the time parameter that sends up sounding signal;
Saidly send up sounding signal to Node B respectively and comprise:
Each antenna of UE sends up sounding signal to Node B according to said time parameter respectively in the corresponding moment.
6. method as claimed in claim 5 is characterized in that,
Said time parameter comprises: the time parameter that periodically sends up sounding signal;
Saidly send up sounding signal to Node B respectively in the corresponding moment and comprise:
UE sends the time parameter of up sounding signal according to said periodicity, periodically sends up sounding signal.
7. method as claimed in claim 6 is characterized in that,
The time parameter that said periodicity is sent up sounding signal comprises: subframe time migration T
Offset, cycle T s and the ascending time slot position of in TTI, sending up sounding signal;
Saidly periodically send up sounding signal and comprise:
UE is according to T
OffsetJudge whether in current TTI, to send up sounding signal with Ts, if then up sounding signal is sent to Node B in the ascending time slot position of the up sounding signal of said transmission in current TTI to Node B.
8. like claim 2 or 3 described methods, it is characterized in that, saidly send up sounding signal to Node B and comprise:
UE is at the ascending time slot in the TTI at the shared ascending time slot place of Node B feedback HS-SICH message, except that the shared ascending time slot of said HS-SICH message; Adopt the antenna the antenna that is adopted except that feedback HS-SICH message, send up sounding signal to Node B.
9. method as claimed in claim 8 is characterized in that, NodeB and UE make an appointment and send the antenna that HS-SICH message adopts.
10. like claim 2 or 3 described methods, it is characterized in that the up sounding signal of said transmission comprises:
When UE and Node B made an appointment in the same TTI a plurality of ascending time slot that can send up sounding signal, UE can send in same TTI on each ascending time slot of up sounding signal and adopt different antennas to send up sounding signal.
11. like claim 2 or 3 described methods, it is characterized in that,
Said signal transmission parameter comprises: dispatching cycle timer Timer timing length;
Said terminal UE receives after the scheduling message of base station node B, and this method further comprises: UE starts or restarts Timer dispatching cycle;
Saidly send up sounding signal to Node B and comprise: the overtime then UE of Timer dispatching cycle stops to send up sounding signal to Node B.
12. method as claimed in claim 11 is characterized in that, said startup or restart dispatching cycle Timer and comprise:
UE receives HS-SCCH message in the continuous dispatching process, perhaps in the semi-continuous scheduling process, receive HS-PDSCH message, and then UE starts or restarts Timer dispatching cycle.
13. method as claimed in claim 2 is characterized in that, saidly sends up sounding signal to Node B and comprises:
If the continuous predetermined number contents of UE is judged current channel quality and is not more than said channel quality thresholds, then UE did not send up sounding signal to Node B before receiving next time scheduling message.
14. like claim 2 or 3 described methods, it is characterized in that said signal transmission parameter comprises: the training sequence code displacement Midamble shift of the free time that will distribute for UE is as said sounding signal.
15. method as claimed in claim 14 is characterized in that, UE is according to the configuration of the high-level signaling of network side, by each idle Midamble shift of the UE time division multiplexing in the same sub-district.
16., it is characterized in that if in the ascending time slot that sends up sounding signal place, UE need send HS-SICH message to Node B like claim 2 or 3 described methods, then,
Said sounding signal is said HS-SICH message.
17. the method for claim 1 is characterized in that, this method further comprises:
Node B receives the up sounding signal from each antenna of UE according to said configuration, estimates the corresponding channel vector of each antenna according to the up sounding signal of each antenna, forms complete channel matrix H by the channel vector of each antenna.
18. method as claimed in claim 17 is characterized in that,
This method further comprises: UE carries current channel quality in the scheduling according to Node B in the HS-SICH message of said Node B feedback;
Node B comprises according to the sounding signal of said configuration reception from each antenna of UE:
Node B judges that whether the current channel quality that carries in the HS-SICH message of UE feedback is greater than the preset channel quality thresholds value of network side, if then Node B begins to receive the sounding signal from each antenna of UE.
19. method as claimed in claim 18 is characterized in that, said signal transmission parameter comprises: the time parameter that sends up sounding signal; Node B comprises according to the sounding signal of said configuration reception from each antenna of UE:
Node B begins to receive after the sounding signal from each antenna of UE, and according to said time parameter, the moment of sending up sounding signal at UE receives said sounding signal.
20. like claim 18 or 19 described methods; It is characterized in that; Node B and UE make an appointment moment of sounding signal of each antenna of UE; Perhaps, Node B and the UE UE that makes an appointment sends the antenna that up sounding signal adopts and the order of the up sounding signal of each antenna transmission first in current dispatching cycle.
21. method as claimed in claim 18 is characterized in that, this method further comprises:
Node B is in the process of scheduling UE; Before estimating complete channel matrix H; Adopt the single-stream transmission pattern to send data, after estimating complete channel matrix H, assess current channel condition according to complete channel matrix H to UE; Current channel condition according to assessing out switches between single-stream transmission pattern and multi-streaming transmission mode, adopts the transmission mode after switching to send data to UE.
22. method as claimed in claim 8 is characterized in that,
UE receive behind the scheduling message first to Node B send the sounding signal the time be engraved in UE after the moment of Node B feedback HS-SICH message.
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