CN101507140A - Method and system for antenna selection in wireless networks - Google Patents

Method and system for antenna selection in wireless networks Download PDF

Info

Publication number
CN101507140A
CN101507140A CNA2007800310519A CN200780031051A CN101507140A CN 101507140 A CN101507140 A CN 101507140A CN A2007800310519 A CNA2007800310519 A CN A2007800310519A CN 200780031051 A CN200780031051 A CN 200780031051A CN 101507140 A CN101507140 A CN 101507140A
Authority
CN
China
Prior art keywords
antenna
tti
pilot tone
send
user data
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CNA2007800310519A
Other languages
Chinese (zh)
Inventor
内莱士·B·梅赫塔
埃德姆·巴拉
张锦云
安德里亚·F·莫利萨奇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of CN101507140A publication Critical patent/CN101507140A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Mobile Radio Communication Systems (AREA)

Abstract

A method and system selects a subset of antennas from a set of antennas to transmit user data in a wireless communication system. The user data is transmitted during a first transmission time intervals (TTI) using a first subset of antennas. Pilot tones are transmitted during a second TTI using a second subset of antennas. Corresponding channel qualities are estimated for the first subset of antennas and the second subset of antennas from the user data and the pilot tones. Then, based on the estimating, a best subset of antenna is selected from the first subset of antennas and the second subset of antennas to transmit the user data during a subsequent TTI.

Description

Antenna selecting method in the wireless network and system
Technical field
Present invention relates in general in wireless communication system, select antenna, more particularly, relate in the transceiver of quantity less than antenna amount of RF chain (RF chain) and select antenna.
Background technology
OFDM
In the wireless communication system of for example third generation radio communication (3G) and Long Term Evolution (LTE) thereof, wish to support multiple service and several data rate simultaneously at the multi-user with the channel of fixed-bandwidth.A kind of scheme is based on current channel conditions and before sending symbol is carried out adaptive modulation and coding.Another operational selection is by assigning different subcarriers or sub carrier group to utilize multi-user's frequency diversity to different users in the LTE that uses OFDM access (OFDMA).
MIMO
In order further to improve the capacity of wireless communication system in the fading channel environment, can use multiple-input and multiple-output (MIMO) antenna technology under the situation that does not increase bandwidth, to increase the capacity of this system.Because the channel of different antennae is may difference very big, so MIMO has improved the robustness of decline and made it possible to side by side send a plurality of data flow.
Though mimo system is done well, it also can increase hardware and signal processing complexity, power consumption and part dimension in the transceiver.This part ground is because each reception antenna all needs to generally include received RF (RF) chain of low noise amplifier, low-converter and analog to digital converter.Similarly, each transmitting antenna element all needs to comprise the transmission RF chain of digital to analog converter, upconverter and power amplifier.
In addition, when signal that receives in to spatial multiplex scheme or the signal that trellis code (space-time trellis code) receives when utilizing sky are handled, need complexity to be the receiver of exponential increase as the function of antenna amount.
It line options
Antenna is simple relatively and cheap, and the RF chain is then complicated and much expensive.It line options has reduced some complexity defectives that are associated with mimo system.It line options has reduced the hardware complexity of reflector and receiver by using the few RF chain of ratio antenna quantity.In the sky line options, select the subclass of available antenna adaptively by switch, and the available RF chain signal of the antenna subset selected of treatment of selected only.In all cases, the subclass of herein using is meant one or more in all available antenna of antenna collection.Notice that the present invention also allows to use a plurality of subclass.For example, can be 4 antennas and 1 RF chain, perhaps 8 antennas and 2 RF chains, both of these case includes four subclass.
In order to select the antenna subset of " the best ",, still need estimation and all possible reflector and reception antenna to corresponding all channels even finally only use selected antenna subset to send.
Pilot tone (pilot tone)
It line options can be used the pilot tone of repetition.Make N tThe quantity of expression transmitting antenna, N rThe quantity of expression reception antenna, and make R t=N t/ L tAnd R r=N r/ L rBe integer.Then, available transmission (reception) antenna element can be divided into R t(R r) individual disjoint subclass.The pilot tone iterative method will be applicable to L t* L rThe training sequence of mimo system repeats R tR rInferior.During each repetition, send (reception) RF chain and be connected to different antenna subsets this training sequence.Therefore, at R tR rInferior repetition last estimated whole channel at the receiver place.
Carry out in forward link and reverse link Frequency Division Duplexing (FDD) (FDD) system inequality under the situation that transmitting antenna selects, receiver feeds back to reflector with the optimal subset of selected antenna.In time division duplex (TDD) system that exchanges (reciprocal), reflector self can be carried out this selection.
Use for indoor LAN with slow variation channel, can carry out a day line options by working medium visit (MAC) layer protocol, referring to IEEE 802.11n wireless LAN draftspecification, I.P802.11n/D1.0, " Draft amendment to Wireless LAN mediaaccess control (MAC) and physical layer (PHY) specifications:Enhancements for higher throughout ", Tech.Rep., in March, 2006.
Finish antenna selection training by sending by MAC course physical layer to utilize different antenna subsets to send and receive the order of dividing into groups, rather than physics (PHY) layer lead code is extended to the extra training field (repetition) that comprises the additional antenna element.Embedding in MAC field has as being used for L t* L rThe training information of the single standard exercise sequence of mimo system.
OFDMA structure among the LTE
At 3GPP TR 25.814, v1.2.2 has described uplink transmission scheme basically in " Physical Layer Aspects for EvolvedUTRA ".This scheme is the single carrier transmission (SC-OFDMA) with Cyclic Prefix (CP), is used to realize between uplink users orthogonality and makes it possible to realize effective frequency domain equalization at receiver-side.
Summary of the invention
A kind ofly in wireless communication system, concentrate to select antenna subset to send the method and system of user data from antenna.Use first antenna subset during first transmit time segments (TTI), to send user data.Use second antenna subset during the 2nd TTI, to send pilot tone.
According to described user data and described pilot tone, estimate corresponding channel quality at described first antenna subset and described second antenna subset.Then, from described first antenna subset and described second antenna subset, select the optimal antenna subclass during next TTI, to send described user data based on described estimation.
Description of drawings
Figure 1A is the block diagram according to the transmission RF chain of an embodiment of the invention;
Figure 1B-1E is the block diagram of transmit time segments according to the embodiment of the present invention;
Fig. 1 F is the block diagram according to the Resource Block of an embodiment of the invention;
Fig. 2 A-2B be according to the embodiment of the present invention data and the block diagram of antenna selection signals;
Fig. 3 A-3B be according to the embodiment of the present invention data and the block diagram of antenna selection signals;
Fig. 4-the 6th, the data according to the embodiment of the present invention and the block diagram of antenna selection signals;
Fig. 7 A-7B be according to the embodiment of the present invention data and the block diagram of antenna selection signals;
Fig. 8 A-8B be according to the embodiment of the present invention data and the block diagram of antenna selection signals;
Fig. 9 A-9B be according to the embodiment of the present invention data and the block diagram of antenna selection signals;
Figure 10 A-10B be according to the embodiment of the present invention data and the block diagram of antenna selection signals;
Figure 11-the 13rd, the data according to the embodiment of the present invention and the block diagram of antenna selection signals;
Figure 14 and 15 is the block diagrams according to the sky line options grouping of an embodiment of the invention;
Figure 16 is the flow chart according to the antenna selecting method of an embodiment of the invention; And
Figure 17 is the block diagram of four antenna switching schemes according to the embodiment of the present invention.
Embodiment
Embodiments of the present invention provide a kind of method and system that is used for carrying out at wireless network the training signal of day line options that generates and send.More particularly, the present invention can be applied in the transceiver of quantity less than antenna amount of RF chain, for example has one to send the RF chain for two transmitting antennas, perhaps has two to send the RF chain for four transmitting antennas.Should be understood that these antenna can also be connected to corresponding reception RF chain still less.Should be noted in the discussion above that technology described here can be used for only having the receiver of individual antenna.The present invention is applicable to the network according to 3GPP, 4G honeycomb, WLAN, WiBro, WiMAX and IEEE802.20 standard design.
Figure 1A shows the part of the transmission RF chain 10 of the employed discrete Fourier transform of embodiments of the present invention (DFT) expansion OFDM receiver.Use 12 pairs of symbols 11 of DFT to encode, carry out subcarrier mapping 13 and IFFT 14 then, carry out Cyclic Prefix (CP) subsequently and insert 14 to generate transmission signal 15.Subcarrier mapping 13 determines which frequency is used to send.
Figure 1B shows and sends subframe or the basic structure of period (TTI) 20.This transmission is divided into the time slot that the duration is 0.5ms.A radio frames length is 10ms.Hereinafter, term TTI and subframe are used interchangeably.A TTI comprises one or more time slot.TTI 21 comprises 24 isolated long piece (LB) 22 and the short blocks (SB) by CP.In TTI length is under the situation of 1.0ms, and subframe has 12 LB and 4 SB.
Fig. 1 C shows the TTI that considers to have a time slot at 3GPP LTE.The duration of this TTI is 0.5ms.This time slot comprises Cyclic Prefix (CP) 24, long piece (LB) 22, short block (SB) 330.Symbol in the short block can be used to send pilot tone 25.Long piece is used to send information symbol (data).Therefore, this TTI comprises 6 LB and 2 SB.
Fig. 1 C shows the TTI that considers to have another 0.5ms of a time slot at 3GPP LTE.In this case, all OFDM symbols all have identical length.One or more LB in the time slot is used to send pilot tone, and other LB are used to send data.In fact, this TTI has 7 LB.
Fig. 1 E shows the TTI with a plurality of time slots 26.For example, this TTI is 1.0ms and comprises two time slots.These time slots can be shown in Fig. 1 C and 1D.
Fig. 1 F shows the basic structure of Resource Block (RB) 21 during transmit time segments (TTI) 20 according to one embodiment of the present invention.This RB is divided into long piece (shadow-free) 22 and short block (shade is arranged) 23, for example 6 or 12 long, and 2 or 4 short blocks.Long piece is used for control signal and data-signal, and short block is used for data-modulated (DM) pilot signal and day line options (AS) signal.
Another of RB may structure can only comprise long piece and not comprise short block that 7 LB are for example arranged in the time slot of 0.5ms.In this case, have at least a LB to be used to data-modulated pilot signal and antenna selection signals subsequently.Signal in the short block often is called as " reference " sound or " pilot tone " sound.The DM signal can be identical with the AS signal, and only be their purposes difference.The DM signal is used for long piece is carried out demodulation, and the AS signal is used for channel estimating and day line options.Should be noted in the discussion above that the channel estimating in the receiver is known.Should be noted in the discussion above that the present invention is not limited to the long piece and the short block of the specific quantity during the TTI.For the sake of clarity, not shown CP in Fig. 1 F.
Signal according to an embodiment of the invention can use OFDM (OFDM).This means signal frequency is expanded on the very wide channel of 5MHz for example or bigger bandwidth.Be typically, RB comprises the subband of 12 or 24 subcarriers.A plurality of subbands can be assigned to specific user.Frequency can continuously or interweave.
In order to support that from the sky line options of subscriber equipment (UE) up link of (BS) UE sends pilot tone from the available transmit antenna collection to the base station.BS estimates channel, selects optimum transmitting antenna subclass, and gives UE with the feedback information relevant with selected antenna subset.Then, US uses selected transmitting antenna further to send to BS.This selection can periodically be carried out, and perhaps carries out through request.Under one situation of back, can begin training and select before require to notify.Should be noted in the discussion above that and to select and the previous identical antenna of antenna that uses.
Suppose that RF chain ratio antenna is few, then use frequency division multiplexing (FDM) or code division multiplexing (CDM) to send pilot tone by different antenna subsets in the Time Division Multiplexing mode, this is consistent with the basic RB structure shown in Fig. 1 C.
In the following description, we at first consider to have the UE and the FDM pilot tone of a RF chain and two transmitting antennas.These schemes are extended to the CDM pilot tone and use then.Then, we consider at the two 2 RF chains and 4 transmitting antennas of FDM pilot tone and CDM pilot tone.Can also further expand based on this description.
We consider the antenna training of two kinds of situations: antenna training and the selection carried out in a TTI, and the antenna that carries out between TTI training and selection.
At in the both of these case each, we describe periodic day line options and through the sky line options of request.We describe the various alternative pilot tones that are used for day line options, for example data-modulated (DM) pilot tone, day line options (AS) pilot tone, broad-band channel quality indicator (CQI) pilot tone or hybrid plan.
The expense that all training programs described here have all been guaranteed to select to be associated with training and antenna subset is than lower with the expense of using all available antenna to be associated.
In following example at UE with 1 transmission RF chain and 2 antennas (Tx1 and Tx2), for structure of time slot with 6 LB and 2 SB, we suppose that a piece (for example SB1) is used to send data-signal, control signal and DM pilot signal, and another piece (SB2) is used for periodically sending the AS signal.For the 1ms TTI that comprises LB (and not having SB), for example LB11 is used to send the DM pilot signal.BS determines channel status according to the signal in the pilot blocks, and correspondingly makes the antenna trade-off decision.For the purpose of description, our hypothesis postpones selecting to notify and exist between actual the switching in UE at BS.
Training when in TTI, carrying out day line options
Use the DM signal
Shown in Fig. 2 A and 2B, can carry out day line options and training by generating the AS signal periodically.Fig. 2 A shows the sky line options that per two TTI carry out, and Fig. 2 B shows the sky line options that per three TTI carry out.
Shown in Fig. 2 A, during a TTI 220, UE utilizes selected antenna (for example BS knows use antenna Tx1) to begin to send most of RB 221 in SB1, comprises all long pieces and DM 201.Yet the AS signal 202 among the RB 221 is never selectively antenna (Tx2) transmissions in SB2.
For the 1ms TTI that comprises 3 time slots (having 2 LB that are used for the DM pilot signal), UE begins to send most of RB, comprise the data that are useful on LB (1-3,5-14) and the LB4 that is used for the DM pilot tone.Yet the AS signal of RB is a never selectable antenna transmission in LB11.
As shown,, perhaps under the situation of CDM pilot tone, have more low-power, so AS signal 202 can be " low expense " signal because AS signal 202 uses reference signal carrier wave (for example being half shown in Fig. 2 A) still less under the situation of FDM pilot tone.
210, BS uses and selects antenna subset at the DM signal 201 of Tx1 with at the AS signal 202 of Tx2.Through after a while, the selection that BS will be for example " using Tx2205 " feeds back to UE after making a choice.UE switches to selected transmitting antenna Tx2 at next TTI after receiving this feedback.Shown in Fig. 2 A and 2B, periodically repeat this training process.
Fig. 2 A and 2B also illustrate, because day required estimated accuracy of line options is lower than the required precision of coherent demodulation, therefore can reduce reverse path for the FDM pilot tone and transmit that (return pathforwarding, expense RPF) can reduce the expense of power for the CDM pilot tone.The expense reduction relates to selects trading off between precision and the minimizing of pilot tone expense.
Use broadband CQI pilot tone
As at shown in Fig. 3 A and Fig. 3 B of uplink channel, can also use broadband CQI pilot tone 302 to realize antenna training and selection, channel is selected and frequency domain distributes so that can carry out at BS wherein to send broadband CQI pilot tone 302.
Shown in Fig. 3 A-3B, a piece (SB1) is used for data-signal (long piece) and the DM pilot tone 301 of most of RB, and another piece (SB2) is used for CQI pilot tone 302.Fig. 3 A shows the joint antenna selection and the Resource Block that use CQI pilot tone 302 to carry out at each TTI and assigns.Fig. 3 B shows use whenever a plurality of (for example per two or whenever more a plurality of) TTI and joint antenna that the CQI pilot tone 302 that sends is carried out is selected and the Resource Block appointment.Usually, the CQI pilot tone sends in each TTI, and perhaps every a plurality of TTI periodically send.
This makes BS can estimate the broadband frequency response of the channel of these two antennas.The attendant advantages that the CQI pilot tone is used to train and selects is to carry out that federated resource piece carrier frequency is assigned again and a day line options, and this has improved the efficient of frequency domain dispatching.UE can switch the frequency of using among antenna and the RB.
Adaptive antenna training and selection through request
As shown in Figure 4, can be only just send the AS signal when being lower than desirable threshold value, rather than periodically send the AS signal in the decreased performance of current antenna.Can keep Signal Interference and Noise Ratio (SINR) estimates, mixes the history that automatic repeat requests (HARQ) state or modulation and encoding scheme (MCS) handle and need carry out a day line options to determine when.This history can be collected by UE or BS.
When UE or BS use for example select triggering signal 401 to make the decision-making of carrying out the antenna training and selecting after, UE sends the AS pilot tone by using aforesaid AS signal 202 or CQI pilot tone during next TTI.Then, BS can estimate these two antennas channel status, select antenna and will make a strategic decision 205 to send it back UE.In this case, to notify the form of AS signal clearly to BS be helpful to UE.
Training when between TTI, carrying out day line options
We are described between the TTI rather than carry out antenna training as mentioned above and the corresponding situation when selecting in TTI now.The implementation complexity at the UE place has further been simplified in selection between TTI, and has brought some the extra delays when selecting the optimal antenna subclass.
Use all TTI
Fig. 5 and Fig. 6 show the transmission that how can realize day line options and training when UE only can be between TTI switches antenna.UE uses selected antenna normally to send RB221.Use unselected antenna Tx2 periodically to send RB 501.By using the channel estimating from previous TTI, BS now can be for UE selects optimal antenna (210), and its decision-making Tx2205 is fed back to UE.This mechanism shows that TTI can be used for antenna training and selection and user data and send.
Fig. 6 shows the same treatment to CQI pilot tone 602.Utilize the TTI 601 of unselected antenna transmission to comprise data and broadband CQI pilot tone 602, and DM pilot tone (if present).As mentioned above, using the TTI with CQI pilot tone can also carry out the federated resource piece assigns and a day line options.Should be noted in the discussion above that the periodicity that unselected antenna is used can be with described above different.
Yet, because may not know the channel of Tx2, so need utilize unselected antenna Tx2 to send with conservative more low rate MCS at BS or UE place.Utilize the RB of unselected antenna transmission to comprise data and pilot tone.Though utilize the initialization of unselected antenna to require conservatively to select MCS, but the channel statistical relevant with up-to-date channel estimating can be used to carry out reliable more and may select by so not conservative MCS, sends to carry out follow-up MCS from unselected antenna.
Adaptive training through request
Fig. 7 A and 7B show in response to the adaptive antenna through request of selecting trigger 410 and select.UE uses selected antenna (Tx1) to send up to recording its decreased performance as mentioned above to being lower than predetermined threshold.UE sends triggering signal 410, and only sends AS pilot tone 701 or pass through the whole RB 702 of transmission shown in Fig. 7 B by utilize untapped antenna shown in Fig. 7 A at next TTI, thereby begins to train.
In one embodiment, at next TTI and selection signal 205, UE reverts to and uses Tx1.In alternative dispensing means, UE continues to use Tx2, unless BS indication UE switches to another antenna.
Many antenna subsets are selected
In following example, how we can realize a day line options in the UE with two RF chains and four transmitting antennas if describing.As mentioned above, if having two RF chains, then send the reference signal of two antennas simultaneously with FDM or CDM mode.Utilize two kinds of different patterns that the reference signal subcarrier of different antennae is described.
Utilize the FDM pilot tone
With in the past the same, we describe the sky line options of using AS pilot tone or broadband CQI pilot tone.Fig. 8 A shows via a pair of unselected antenna (Tx3 and Tx4) and sends AS signal 701 on per two TTI period ground, and Fig. 8 B shows the AS signal that per three TTI send.
Utilize the CDM pilot tone
Fig. 9 A-9B shows the antenna training that utilizes periodicity FDM broadband CQI pilot tone 901 and RB to assign again and carry out and selects.For the situation of per two TTI and per three TTI, use a pair of unselected antenna respectively, for example Tx3 and Tx4.
Figure 10 A-10B shows the antenna subset that is undertaken by periodic CDM data-modulated pilot tone 1001 and selects.In this case, two pilot tone 1001-1002 that send simultaneously are orthogonal.There is similar scheme in situation about switching between TTI for UE and for the situation through (self adaptation) day line options of request.
Antenna training at a RF chain and four transmitting antennas
Figure 11 illustrates execution mode at a RF chain and four antennas.UE sends training information at four antennas, is movable (active) so that constantly a transmitting antenna is only arranged at any one.Though we have described three kinds of selections, also have other popularization and combination.
As shown in figure 11, UE sends packet from Tx1 in a TTI 1101, and uses the AS signal 202 of SB2 transmission at Tx2.Then, BS can determine that among antenna Tx1 and the Tx2 which is better, and its decision-making (for example using the decision-making of Tx2 1105) is fed back to UE.UE receives this feedback after the 3rd TTI.Simultaneously, UE retransmits second packet from Tx1 in the 2nd TTI 1102, and uses the AS signal of the SB2 transmission of RB at Tx3.Then, according to the indication of BS before, reflector switches to Tx2, and uses Tx2 to send the 3rd packet in TTI 1103.In same TTI, UE uses the sky line options pilot tone of SB2 transmission at last remaining antenna Tx4.Then, the definite for example Tx3 of BS is the optimal antenna in all four antennas, and indication UE uses Tx3 to send.Next, UE uses Tx3 1103 to send packet 1104.At having 14 LB and wherein having 2 LB to carry the 1ms TTI of reference signals, similar mechanism can be described.
Notice that when the channel of different antennae was estimated, BS upgraded its trade-off decision and feeds back to this decision-making.In one embodiment, BS only feeds back its final decision but not the selection renewal of increment.In this case, do not have the feedback of using Tx2, and UE uses Tx1 to send the 3rd TTI.
Figure 12 shows another possibility that accelerating selection is handled.This possibility uses the combination of selecting between interior selection of TTI and TTI.UE uses antenna Tx1 to send packet in a TTI 1201, and uses SB2 to send AS signal 1202 from antenna Tx2.Then, UE switches to antenna Tx3 sending packet in the 2nd TTI 1203, and sends the AS signal 1204 at antenna Tx4 in SB2.
Then, BS can determine the channel of all four transmitting antennas and it is compared, and its trade-off decision is fed back to UE, and for example Tx3 1205.When waiting for trade-off decision, UE continues to send packet from antenna Tx1, after this, switches to antenna Tx3.
Perhaps, as shown in figure 13, when BS only can estimate the subclass of channel status of a plurality of available antenna, BS sent incremental update.BS compares the channel of antenna Tx1 and Tx2 after a TTI, and its trade-off decision 1301 is sent it back UE.For example, BS selects Tx2 1301.UE receives this decision-making after the 2nd TTI.In the 2nd TTI, UE sends its packet with the same antenna Tx3 that uses in the past, and uses Tx4 to send the AS signal.Yet in the 3rd TTI, after the trade-off decision that receives BS, UE switches to Tx2 and sends packet.With in the past the same, after the 2nd TTI, BS can compare four all antennas, and its trade-off decision (for example Tx3 1302) is sent it back UE.After the 3rd TTI, UE switches to Tx3.
Use the AS grouping
Independently AS grouping
Except above-mentioned execution mode, day line options is handled sky line options (AS) grouping 1400 that can also use as shown in figure 14.The AS grouping for example is embedded into sky line options control (ASC) information 1401 in the first long piece (LB1), and, perhaps be embedded into (for TTI) among the LB4 with 14 LB with among DM pilot tone (P) the signal 1402 embeddings first short block SB1 (for time slot) with 2 SB.The business that such operation is highly suitable for happening suddenly, this is because just finished selection before sending burst.ASC information can indicate UE and use which antenna.Therefore, BS can get up its channel estimating and specific antenna direct correlation.In addition, control information can also refer to illustrate the UE request and carries out a day line options, and the pilot tone that indicates among the second short block SB2 should be used for training by BS.
As shown in figure 14, BS is selecting not need to receive pilot tone before the antenna.BS can select after receiving preceding two OFDM symbols of uplink TTI immediately.This relates to following particular step and time delay.BS receives the first and second OFDM symbols of UL TTI from UE, and to postpone T 0Carry out channel estimating and day line options.For radius of society, there is insignificant round-trip propagation delay T less than 10km 1UE receives the first long piece and first short block of DL TTI, and subsequently, UE is to postpone T 2Switch to selected antenna.
Incidentally AS training
Perhaps, as shown in figure 15, UE can be used for a day line options with control grouping (grouping that for example has ACK or NACK 1501 in LB1).Even UE does not have other uplink packet will send to BS, UE still sends such grouping in up link receive grouping from BS after.In order to reduce the expense of day line options, can on unselected antenna, utilize some to divide into groups to send ACS field 1401.Therefore, this scheme does not need to send additional grouping.As mentioned above, can be periodically or be with AS information adaptively slightly.Therefore, UE or BS can start this processing.
Antenna selecting method
Figure 16 has shown the antenna selecting method that according to the embodiment of the present invention.Select first antenna to be used for sending signal from UE to BS 1610, for example selected antenna is last used antenna.Suppose that this selection is known to UE and BS.1620, UE sends packet via selected antenna (Tx1) to BS during TTI.In the long piece of packet, carry data (or control signal).
1630, as mentioned above, UE also uses unselected antenna (for example Tx2) to send the AS signal.The transmission of AS signal can be that periodically every k TTI carries out or carry out through request.Carrying AS signal in the short block of this grouping or in next packet.The AS signal can be FDM or cdm signal.As described here, AS signal even can be low overhead signal.If this signal is the FDM pilot tone signal, then low expense means the channel distortion experienced of smaller amounts.For the CDM pilot tone, low expense has lower power.
In step 1640, in response to receiving packet and AS signal, BS estimates channel and antenna is selected, and this selection is sent to UE.Under the situation of CDM pilot tone, BS can also assign the carrier frequency of the employed Resource Block of UE again.
Then, after receiving this selection, and may be after RB assigns again, UE switches to selected antenna and sends subsequent packets.
If it line options is carried out through request, then UE or BS can be historical and start this selections processing based on SINR, MCS or HARQ.
Figure 17 shows 4 kinds of modes can switching (1701) after having selected antenna to antenna.According to concrete realization, antenna is switched the required time can be measured with nanosecond, for example 10 to 100 nanoseconds.This order of magnitude will be lacked than the length (for example 10ms) of symbol.
Therefore, in an embodiment of the invention, come down between symbol, antenna to be switched (1701).That is, this switching can be the carrying out of the piece of previous symbol at last, and perhaps the section start at the CP of next symbol carries out.
These 4 kinds of modes comprise: switch in being used to send the LB/SB of pilot tone fully, and use CP 1710 and LB or SB data division to switch (1701); Use is used to send the CP of LB/SB of pilot tone and the CP of adjacent LB switches (1702); Use is used to send the CP of LB/SB of pilot tone and the CP of adjacent LB switches (1703); Use the CP of adjacent LB and do not use the CP that is used to send pilot tone LB/SB to switch (1704).In above-mentioned 4 kinds of methods, wherein will comprise the loss minimum of first method on performance that the LB/SB of the pilot tone that will send is used to switch, this is because data LB is not affected.
Effect of the present invention
Embodiments of the present invention provide a kind of in the MIMO network user's set and the base station it Between up-link in the sky line options, wherein in this MIMO network, the RF chain among the UE Quantity is less than the quantity of antenna.
Although described the present invention take preferred embodiment as example, should be understood that, at this Can make various other modifications and change in the bright spirit and scope. Therefore, claims Purpose be to contain all this modification and changes that fall in the spirit and scope of the present invention.
Industrial applicibility
Method and system of the present invention is applicable to polytype wireless network.

Claims (22)

1. concentrate the selection antenna subset to send the method for user data from antenna in wireless communication system for one kind, this method may further comprise the steps:
Use first antenna subset during first transmission time interval (TTI), to send user data;
Use second antenna subset during the 2nd TTI, to send pilot tone;
According to described user data and described pilot tone, estimate corresponding channel quality at described first antenna subset and described second antenna subset; And
From described first antenna subset and described second antenna subset, select the optimal antenna subclass during next TTI, to send described user data based on described estimation.
2. method according to claim 1, wherein, a described TTI is identical with described the 2nd TTI.
3. method according to claim 1, wherein, described estimation is used for frequency domain dispatching.
4. method according to claim 1, wherein, described selection cycle ground is carried out.
5. method according to claim 1, wherein, described selection is carried out through request.
6. method according to claim 2, wherein, described being chosen in the single TTI carried out.
7. method according to claim 1, wherein, described being chosen in after described the 2nd TTI carried out.
8. method according to claim 1, wherein, described user data and described pilot tone send as symbol, and each symbol comprises Cyclic Prefix and block of data signals, and this method further may further comprise the steps:
Roughly between two continuous symbols of transmission, be transformed into described second antenna subset from described first antenna subset.
9. method according to claim 1, wherein, described pilot tone is the data-modulated pilot tone.
10. method according to claim 1, wherein, described pilot tone is the CQI pilot tone.
11. method according to claim 1, wherein, described pilot tone comprises data-modulated pilot tone and CQI pilot tone.
12. method according to claim 1, wherein, described estimation is carried out in the receiver of described user data and described pilot tone.
13. method according to claim 5 wherein, depends on channel quality through the selection of request.
14. method according to claim 5, this method further may further comprise the steps:
The history of keeping the Signal Interference and Noise Ratio estimation is to determine the scheduling through request.
15. method according to claim 5, this method further may further comprise the steps:
The history of keeping the automatic repeat requests state of mixing is to determine the scheduling through request.
16. method according to claim 1, wherein, described antenna collection comprises four antennas, and described best subset comprises an antenna.
17. method according to claim 1 wherein, sends described user data and described pilot signal by a plurality of antenna subsets, and selects the optimal antenna subclass.
18. method according to claim 1, wherein, described selection is based on a day line options control grouping.
19. method according to claim 1, wherein, described selection is based on the control grouping.
20. method according to claim 19, wherein, described control grouping is the ACK grouping.
21. method according to claim 19, wherein, described control grouping is the NACK grouping.
22. concentrate the selection antenna subset to send the system of user data from antenna in wireless communication system for one kind, this system comprises:
Be used to use first antenna subset during first transmission time interval (TTI), to send the device of user data;
Be used to use second antenna subset during the 2nd TTI, to send the device of pilot tone;
Be used for estimating at described first antenna subset and described second antenna subset device of corresponding channel quality according to described user data and described pilot tone; And
Be used for selecting the optimal antenna subclass during next TTI, to send the device of described user data from described first antenna subset and described second antenna subset based on described estimation.
CNA2007800310519A 2006-08-22 2007-08-20 Method and system for antenna selection in wireless networks Pending CN101507140A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US83936606P 2006-08-22 2006-08-22
US60/839,366 2006-08-22
US11/620,105 2007-01-05

Publications (1)

Publication Number Publication Date
CN101507140A true CN101507140A (en) 2009-08-12

Family

ID=40977824

Family Applications (1)

Application Number Title Priority Date Filing Date
CNA2007800310519A Pending CN101507140A (en) 2006-08-22 2007-08-20 Method and system for antenna selection in wireless networks

Country Status (1)

Country Link
CN (1) CN101507140A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102714567A (en) * 2010-01-11 2012-10-03 Lg电子株式会社 Method and apparatus for transmitting and receiving PDCCH using DCI having adjusted size
CN103346826A (en) * 2013-06-27 2013-10-09 福建星网锐捷网络有限公司 Method for selecting intelligent antenna and access point
CN105656509A (en) * 2014-11-14 2016-06-08 联想(北京)有限公司 Control method and electronic device
CN105991169A (en) * 2015-02-02 2016-10-05 启碁科技股份有限公司 Wireless communication device and antenna search method
WO2017088687A1 (en) * 2015-11-27 2017-06-01 中兴通讯股份有限公司 Method and device for indicating antenna selection information
WO2019041146A1 (en) * 2017-08-29 2019-03-07 南通朗恒通信技术有限公司 User equipment used for wireless communications, and method and apparatus in base station
CN113839700A (en) * 2016-02-12 2021-12-24 上海朗帛通信技术有限公司 Method and device in user equipment and base station for wireless communication

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102714567A (en) * 2010-01-11 2012-10-03 Lg电子株式会社 Method and apparatus for transmitting and receiving PDCCH using DCI having adjusted size
CN102714567B (en) * 2010-01-11 2015-04-22 Lg电子株式会社 Method and apparatus for transmitting and receiving PDCCH using DCI having adjusted size
US9031016B2 (en) 2010-01-11 2015-05-12 Lg Electronics Inc. Method and apparatus for transmitting and receiving PDCCH using DCI having adjusted size
CN103346826A (en) * 2013-06-27 2013-10-09 福建星网锐捷网络有限公司 Method for selecting intelligent antenna and access point
CN103346826B (en) * 2013-06-27 2016-06-29 福建星网锐捷网络有限公司 The system of selection of smart antenna and access point
CN105656509A (en) * 2014-11-14 2016-06-08 联想(北京)有限公司 Control method and electronic device
CN105991169A (en) * 2015-02-02 2016-10-05 启碁科技股份有限公司 Wireless communication device and antenna search method
CN105991169B (en) * 2015-02-02 2019-06-25 启碁科技股份有限公司 Wireless communication device and day line search method
WO2017088687A1 (en) * 2015-11-27 2017-06-01 中兴通讯股份有限公司 Method and device for indicating antenna selection information
CN113839700A (en) * 2016-02-12 2021-12-24 上海朗帛通信技术有限公司 Method and device in user equipment and base station for wireless communication
WO2019041146A1 (en) * 2017-08-29 2019-03-07 南通朗恒通信技术有限公司 User equipment used for wireless communications, and method and apparatus in base station
CN110945797A (en) * 2017-08-29 2020-03-31 上海朗帛通信技术有限公司 Method and device in user equipment and base station for wireless communication
US11224041B2 (en) 2017-08-29 2022-01-11 Shanghai Langbo Communication Technology Company Limited Method and device in UE and base station used for wireless communication

Similar Documents

Publication Publication Date Title
US7583939B2 (en) Method and system for antenna selection in wireless networks
US8228858B2 (en) Method and system for generating antenna selection signals in wireless networks
US8331297B2 (en) Method and system for generating antenna selection signals in wireless networks
US8483186B2 (en) Method and system for generating antenna selection signals in wireless networks
JP5113239B2 (en) Methods and configurations for communication networks
KR100962971B1 (en) On-demand reverse-link pilot transmission
KR100991798B1 (en) A method of transmitting data by utilizing resources in hybrid automatic request operations
CN102017453B (en) Antenna selection with frequency-hopped sounding reference signals
CN102017455B (en) Antenna selection with frequency-hopped sounding reference signals
CN101529738B (en) Downlink mimo transmission control method and base station device
CN101848531A (en) Uplink pilot in the wireless communication system and signaling transmission
CN101436892A (en) Method for selecting antennas in a wireless network
KR20100068362A (en) Reporting channel quality information
CN101507140A (en) Method and system for antenna selection in wireless networks
JP2010503246A (en) Antenna switching method and system for transmission time interval in OFDMA system
EP2016693B1 (en) Method and apparatus for improved single cell adaption due to change in environment
JP5199387B2 (en) Transceiver antenna selection method and transceiver
Li et al. Uplink phy design with shortened tti for latency reduction
CN1708999B (en) Uplink pilot and signaling transmission in wireless communication systems
KR101119275B1 (en) Configuration method of channel in a communication system using orthogonal frequency division multiple access scheme and transmitting/receiving apparatus and method thereof
Nie et al. Antenna selection for next generation IEEE 802.16 mobile stations
GB2478735A (en) Antenna selection procedure which involves receiving data on a first antenna at the same time as receiving sounding signals on a range of other antennae

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20090812