CN103797883A

CN103797883A - Uplink channel for wireless communication

Info

Publication number: CN103797883A
Application number: CN201180073406.7A
Authority: CN
Inventors: T·莫斯利; M·特萨诺维奇; M·韦勃; 李兆俊
Original assignee: Fujitsu Ltd
Current assignee: Fujitsu Ltd
Priority date: 2011-09-29
Filing date: 2011-09-29
Publication date: 2014-05-14
Also published as: WO2013044970A1

Abstract

A scheme to allow the random access process (for example) in an LTE UE to transmit more useful information earlier in the procedure is provided. The scheme may be achieved by transmitting two linked signals which could be two simultaneously transmitted PRACH signatures. The additional information (such as UE identity or buffer status) is indicated by the choice of the second signal/signature, and/or by some combination of transmission characteristics of the linked signals, thus allowing an LTE network to reach a state of transmitting and/or receiving higher data rates more quickly than the current RACH procedure, reducing latency and improving the user experience. The scheme is achieved without requiring significant additional complexity in the network.

Description

For the up channel of radio communication

Technical field

The present invention relates to send to base station the transmission method of transmission data in the wireless communication system that comprises base station and subscriber station.The invention still further relates to the subscriber station, base station and the computer program that in described method, use.

Especially, but and not exclusively, the present invention relates to the LTE(Long Term Evolution of describing according in version 9,10 in for example 3GPP TS36 series of canonical, 3GPP line of specifications and later release) and the uplink communication process of LTE-advanced wireless technical standard.But, the present invention can also be applied to UMTS, WiMAX and wherein radio resource allocation request be sent to other communication system of base station from subscriber station (also referred to as " user terminal ", " subscriber equipment " or UE, " mobile terminal " etc.).

Background technology

Wireless communication system is widely known by the people, wherein, base station (BS) form " community " and with BS within the scope of subscriber station communications.For example, in LTE, base station is commonly called eNodeB or eNB, and subscriber station is called as subscriber equipment or UE.

In such system, each BS subscriber equipment that the usable frequency in given community and time resource are served for it by it is divided into independent resource and distributes.Subscriber equipment normally moves, and therefore can move in minizone, makes between the base station of neighbor cell, to carry out the switching of wireless communication link.Subscriber equipment is (that is, can detect the signal from multiple communities) in the scope in multiple communities simultaneously, but in the simplest situation, subscriber equipment and " service " community or " master " cell communication.Wireless communication system and wireless communication system Zhong community can be in FDD(Frequency Division Duplexing (FDD)) or TDD(time division duplex) operate under pattern.

As shown in Figure 1, resource in system have frequency dimension and time dimension the two, wherein frequency dimension is that unit divides according to subcarrier, and time dimension has the unit of symbol time or " time slot " (wherein " time slot " generally has the duration of seven symbol times).Distribute the subcarrier of the specific quantity of scheduled time amount to UE by the scheduling feature at eNodeB place.Although uplink is the most relevant to the present invention that will describe, resource be assigned to UE with not only for downlink transfer but also for uplink.

As shown in the figure, by the resource grid of subcarrier and available OFDM symbol, the signal sending has been described in each time slot.Each element in resource grid is called as resource element (RE), and each resource element is corresponding to a symbol.Comprise and set the subcarrier of quantity and the stock number of OFDM symbol is called as Resource Block (RB) in LTE, as shown in the thick outline line in Fig. 1.

Up link in LTE wireless communication system has adopted the variant of the OFDMA that is called as Single Carrier Frequency Division Multiple Access (SC-FDMA).Substantially, SC-FDMA is the OFDMA scheme that comprises a kind of linear predictive coding of extra DFT step before OFDMA processes.By distributing one group of unique not overlapping subcarrier to each UE, make multiple UE can be linked into up link.Here, also mode is by reference incorporated herein 3GPP TS36.300, and 3GPP TS36.300 particularly provides the entirety of the Radio interface protocols framework to using in the system based on LTE to describe in relate to uplink scheme Section 5.2 of 3GPP TS36.300.

In LTE, in system, define the multiple channels for data and control signal according to different abstract level.

Fig. 2 shows in LTE some channel in multiple up channels of each restriction in logic level, transmission level and physical layer level and the mapping between them.User data, also have some signaling datas be carried on Physical Uplink Shared Channel (PUSCH).Utilize the frequency hopping on PUSCH, frequency diversity effect can be utilized and be made to disturb finally to reach balance.Control channel comprises Physical Uplink Control Channel PUCCH, and PUCCH for example, for carrying the signaling that comprises channel condition information (CSI, by channel quality indication (CQI) report expression) and dispatch request from UE.Attract people's attention most for current purposes, also have Physical Random Access Channel PRACH, PRACH has corresponding Random Access Channel RACH in transmission level.Except above-mentioned channel, ascending resource is also assigned to reference signal (especially, surveying reference signal SRS).SRS is used in the frequency of wide region, the quality of the up link to UE to be estimated by network, rather than only those frequencies of distributing to UE is estimated.Therefore, SRS needn't send together with any physical channel.

Meanwhile, on down link (not shown), user data and higher level signaling (for example, for Radio Resource control (RRC) signaling) are carried on Physical Downlink Shared Channel (PDSCH).Other control channel signaling signaling of allocation of radio resources (for example, for) is carried by physical downlink control channel PDCCH.

If UE does not have the uplink transmission resource of any distribution, Physical Random Access Channel PRACH is used to the Random Access Channel (RACH) of carrying for access network.For example, if triggered dispatch request (, being triggered by the arrival of the data for transmitting) at UE place on PUSCH,, in the time not having PUSCH resource to be assigned to UE, sent SR for this object on private resource.If such resource is not assigned to UE, initiate RACH process.The transmission of SR is actually and is directed to transfer of data and request to the ascending wireless resource on PUSCH.

Therefore, RACH is provided so that UE can, in the case of not having any available private resource transmitted signal in up link, can send more than one terminal simultaneously in identical PRACH resource.Use term " at random access " be due to network (incidentally, in this manual, term " system " and " network " use interchangeably) in advance and do not know that meaning in office is used UE(or multiple UE of resource preset time) mark (below by the situation of the uncompetitive RACH describing except).UE adopts so-called " signature " (seeing below) to allow eNodeB to distinguish between different transmission sources.

UE can use RACH in the pattern based on competition or uncompetitive pattern.In the access based on competition, UE selects any signature randomly, and its risk is if two or more UE unexpectedly select identical signature, can occur at eNodeB place " conflict ".Uncompetitive access is by being notified each UE can use which signature to avoid conflict by eNodeB.

With reference to Fig. 3, the general following operation of Physical Random Access Channel PRACH (for the access based on competition) :-

(i) in UE(figure, represent with 10) receive for the downlink broadcast channel of paying close attention to community (Serving cell).

(ii) the network being represented by eNodeB20 in Fig. 3 represents cell-specific information, and described cell-specific information comprises following information:

● can be used for the resource of PRACH

● available signature (nearly 64)

● the signature corresponding with little message size and large message size

(iii) UE selects PRACH preamble signature according to those information of access and the message size of expection that can be used for based on competition.

(iv) UE10 sends PRACH lead code (also referred to as " message 1 ", being represented in the drawings by (1)) in the up link of Serving cell.Network (more specifically, the eNodeB of Serving cell) receipt message 1, and the transmit timing of estimation UE.

(v) UE10 monitors the down channel of appointment for carrying out the response of automatic network (in other words, from eNodeB).In response to the transmission of the message 1 of UE, UE10, from network receiving random access response or RAR(" message 2 ", is represented by (2) in Fig. 3).The UL that accidental access response or RAR have comprised for transmitting on PUSCH authorizes and orders for the timing advance (TA) that makes UE adjust its transmit timing.

(vi) in response to receive message 2 from network, UE10 utilizes the UL comprising in message 2 to authorize and TA information sends on PUSCH that (" message 3 ", is shown (3) in figure.

(vii) as located indication in (4), if of receiving identical preamble signature and these UE from more than one UE of eNodeB20 has sent message 3 above simultaneously, can send competition from network (in the case, from eNodeB20) and solve message.

If UE does not receive any response from eNodeB, UE selects new signature and in RACH subframe, sends new transmission random after keeping away the time of moving back.

For uncompetitive RACH access, except UE is configured with dedicated signatures, similar process.

Under this background, above " signature " can be regarded as and transmit the general-purpose attribute (or community set) being associated.This sequence (this sequence determines waveform) is the most important attribute of PRACH lead code.Therefore, particular sequence (may together with other characteristic of transmission) has implied specific signature.

The situation that uses RACH to process comprises:

-from the initial access of RRC_IDLE

-RRC connection re-establishes

-switch

DL data in-(when asynchronous) RRC_CONNECTED arrive

-(when asynchronous or while not having SR resource available) UL data in RRC_CONNECTED arrive

-location (based on timing advance)

RACH process can (for example, arrive or location for DL data) and be triggered in response to PDCCH order.Uncompetitive RACH is only applied to switching, DL data arrive and location.

Fig. 4 is exemplified with the form of the PRACH preamble message in LTE.The protection interval (not shown here) of the arrival that as shown in the figure, this message (here by 30 expressions) comprises cyclic prefix CP 31, preamble sequence 32 self and allows eNodeB place difference regularly.CP has duration T _cP33 and sequence 32 there is duration T _sEQ34.Note, in conventional PRACH lead code, do not have the space for the extraneous information such as UE mark.

Fig. 5 has summarized and how to carry out different cyclic shifts by the base station sequence 36 from identical and carry out the leading-out needle preamble signature 30A-30D different to the PRACH of different UEs.In each situation, CP31 and protection interval 35 are identical, and PRACH lead code is difference aspect shift amount only, as indicated in the dotted line in each in 30A-30D.In LTE, PRACH preamble sequence is derived from so-called Zadoff-Chu sequence type.This sequence type has following attribute: the version after the cyclic shift of same sequence is orthogonal.Incidentally, in the above-mentioned detection reference signal of generation (SRS), also relate to Zadoff-Chu sequence, therefore survey reference signal and also there is signature.

Therefore, UE is equipped with Zadoff-Chu maker 11 as shown in Figure 6.As shown in Figure 6, the transmission of PRACH lead code not only relates to the generation of sequence, but also relate to discrete Fourier transform (DFT) level 12 and at modulating stage 13 places to the modulation on the SC-FDMA carrier wave using in up link.

The PRACH lead code being sent by UE, have particular signature (referring to Fig. 5) has caused eNodeB to receive unique waveform.As the example of Check processing, eNodeB is by making the judgement of corresponding to which (which) signing about this waveform by relevant the signature of waveform and all possible transmissions.Fig. 7 illustrates this, and its midband 300 represents the signal receiving.First be that base band and removal CP(do not illustrate by signal down conversion).FFT21 processes that to the signal obtaining SC-FDMA symbol is transformed from the time domain to frequency domain.This makes it possible to carry out subcarrier and goes being correlated with in frequency domain in map level 22, to extract RACH preamble sequence (signature).Next, carry out at 23 places the contrary FFT that gets back to time domain.Finally, energy measuring level 24 is estimated the power of the signature receiving, and by comparing and make above-mentioned judgement with predetermined threshold value.

Although as already mentioned, signature can imply by PRACH preamble sequence, but other signal including the reference signal of all SRS as already mentioned also can characterize and be processed by eNodeB according to the mode similar to the mode shown in Fig. 7 by signing.

Suppose and in LTE, stipulated as shown in Figure 4 PRACH lead code form, UE only can use RACH message 1 to indicate limited control information.If can earlier pass on more control information in RACH process, systematic function can improve.For example can reduce the initiation of this RACH process and there is maximum data rate or the beginning of the transfer of data of spectrum efficiency between delay.

In LTE, the signature that UE sends is designed to utilize at network place as the correlation technique of indicating in Fig. 7 (be correlator of each sequence) reception.The information content that directly increases signature by increasing the quantity of available signatures significantly increases the complexity that causes eNodeB.Therefore, need different solutions.

Summary of the invention

According to a first aspect of the invention, a kind of wireless communications method is provided, and wherein, website is carried out transmission, described transmission is characterized by least one signature in the up link to cordless communication network, and described website is by representing information with lower at least two to described network:

Selection to signature from predefined at least one group of signature;

The combination of the transmission characteristic of two or more signatures; And

The quantity of the signature sending.

Here, described " website " mainly means subscriber station, but term " website " also can for example represent relay station.The selection of signature refers to the specific selection to signature.The combination of transmission characteristic for example can comprise the difference between one or more characteristic.The quantity of the signature sending can be one or be greater than one any amount; This comprises that but website is configured to send the signature of two links can represents by only sending a signature rather than two signatures the situation of information.

In above method, preferably, described transmission comprises at least two signatures by linking with lower at least one item: the time interval between the timing of the transmission of described signature or the transmission of described signature; Frequency interval between the frequency of described signature or described signature; And the interval of code in Huo Ma territory, territory.Here, " code territory " expression can be used to one group of possible code (or sequence) of distinguishing between transmission; For example, one group of spreading code.

Each signature can be associated from different Numerical Indexs, described information is represented at least in part by described Numerical Index, or the in the situation that of two or more signatures, information for example, is represented at least in part by the combination of numbers (, the difference between two Numerical Indexs) of two Numerical Indexs.

When signature may be in described resource, when different aspect at least one regularly, in frequency or code territory, described information can be represented at least in part by this difference.

As mentioned above, described website can be subscriber station or relay station.Uplink above-mentioned can be carried out via any one with lower or more: Random Access Channel, its can for this website to network based on competition random access procedure; Ascending control channel; Reference signal; And Uplink Shared Channel.Hereinafter these are called to channel or the signal of concern.

In the preferred embodiment of the present invention, described transmission is via described Random Access Channel, and comprise at least two signatures, in described at least two signatures first signatures is selected for the object of described random access procedure, and the signature of second in described at least two signatures is in order to show described information and to select individually or with described the first signature combination earth's surface.But, it is noted that the present invention is not limited to the use of Random Access Channel.Described channel or signal for the purposes of the present invention, can use channel or the signal of any type, as long as can allow website to utilize signature above-mentioned to carry out the transmission of described network.

The application of the invention, can represent to described network the information of a lot of types.Described information can be used to indicate with lower at least one item: the visible antenna of the above website of at least one down link (" visible " antenna is those antennas that the signal of antenna can be received by website); The mark of described website; The ability of described website; The delay tolerance of described website; Channel conditions on the down link of at least one community; The buffer status at described website place; Described website is about the synchronous regime of described network; And about the information of previous radio jink failure.

At described website, via multiple communities and described network service in the situation that, described transmission can be included in the first signature sending on the first community and be included in alternatively the second signature sending on the second community.In the case, preferably, the transmission of described the second signature indicates channel conditions on the down link of described the second community and/or described website to the preference communicating via described the second community.

In any means being defined as above, in the situation that described transmission comprises two or more signatures, a signature in described signature can be as for example selected randomly according to the known RACH process in LTE.

The described network of using said method can be the network based on LTE.

More specifically, in the preferred embodiment of the present invention, described transmission comprises a PRACH signature and the 2nd PRACH signature, wherein PRACH is the Physical Random Access Channel limiting in LTE, described the first signature is used to according to the RACH process request accidental access response RAR defining in LTE, and described the second signature is used to indicate the object of described information, and described signature is corresponding with each PRACH preamble sequence defining in LTE.

According to a second aspect of the invention, provide a kind of wireless communication system, described wireless communication system is according to any operation in the above method limiting.

According to a third aspect of the invention we, provide a kind of subscriber station, this subscriber station is the website using in any in said method, and is configured to carry out signature selection to represent described information to described network.

In various wireless communication system, described subscriber station is the mobile device via base station and described network service, formation community, described base station.According to a forth aspect of the invention, provide a kind of base station equipment, this base station equipment is used in any of said method, and is configured to by recovering described signature or each signature information extraction from described transmission.

According to a fifth aspect of the invention, a kind of computer-readable instruction is provided, in the time that the processor of the transceiver devices in wireless communication system is carried out described computer-readable instruction, described computer-readable instruction makes described device that subscriber station as above or base station are provided.This instruction can be stored on one or more computer-readable medium.

Generally, unless and have contrary clear indication, the feature of describing about one aspect of the present invention can be applied to any other side equally and according to combination in any, even if such combination is not here mentioned clearly or describes.

From above, can find out, the present invention relates to for example, signal transmission between website (, subscriber station or relay station) and network (wireless communication system).Here alleged " website " can adopt any form that is suitable for sending and receiving such signal, such as subscriber station or relay station.In order to make the more vivid object of the present invention, can easily website be envisioned as to mobile handheld terminal, in any case but do not imply accordingly restriction.In the preferred embodiment of the present invention, base station generally will adopt the form for realizing proposing in 3GPP LTE and 3GPP LTE-A standard group, and therefore can in different situations, according to circumstances be described to eNodeB(eNB) (this term also comprises the eNodeB of family or HeNB).But according to functional requirement of the present invention, some or all base station can adopt any other form being suitable for from subscriber station and relay station sending and receiving signal.

Accompanying drawing explanation

Only in the mode of example with reference to accompanying drawing, in the accompanying drawings:

Fig. 1 is exemplified with the Resource Block in the up link of LTE wireless communication system (RB);

Fig. 2 shows the relation between the various up channels that limit in LTE;

Fig. 3 shows the RACH process based on competition in LTE;

Fig. 4 shows the form of PRACH lead code;

Fig. 5 is exemplified with generate PRACH preamble signature at UE place;

Fig. 6 has summarized the order of the processing that sends PRACH lead code in UE;

Fig. 7 is exemplified with detecting PRACH lead code at eNodeB;

Fig. 8 shows the RACH process based on competition of revising according to the present invention;

Fig. 9 shows the step in method of the present invention that realizes of being carried out by subscriber station; And

Figure 10 shows the step in method of the present invention that realizes of being carried out by base station.

Embodiment

Unless otherwise noted, execution mode described below is described by way of example under the background of LTE, wherein wireless communication system (also referred to as " network ") utilizes FDD to operate and comprises one or more base station (also referred to as " eNodeB " or " eNB "), one or more descending community is controlled in each base station, and each descending (DL) community has corresponding uplink cells.One or more subscriber station (also referred to as " UE ") can be served in each DL community, and described subscriber station may be received in the signal that sends in Serving cell and to signal decoding.Explanation is below particularly with reference to PRACH, because PRACH provides for realizing convenient channel of the present invention; But as already mentioned, the present invention is not limited to PRACH.

As already mentioned, may expect that PRACH carries additional control information.According to this situation, and considering and may be difficult in practice support large efficient message size, will be favourable such as following additional control information:

Zero UE ID(mark) (or reduction version of UE ID)

Zero uses the reason of RACH access

Zero UE ability (for example, can utilize MIMO sending/receiving)

The delay tolerance (or delay tolerance of the service moving on UE) of zero UE

Zero UE synchronous/connection status (expiry of the timer for example, using in connection procedure)

Zero buffer state (, being ready to the amount of the data that sent by UE)

The antenna port (for example,, the in the situation that of spaced antenna) at the visible eNodeB of zero UE place

Use (for example, the there is no TA(timing advance subsequently) message of the revision of zero RACH process, has wherein set up or has not needed time alignment)

Zero event log (or some information deriving from event log), for example, for the situation of radio jink failure

Zero is historical in the past, the interference of recently observing such as UE or the indication of other channel conditions

Now by only by way of example with reference to mainly for the senior improved random access scheme of LTE-, principle of the present invention being described.

In one form, compared with known RACH scheme for LTE, the signal of two links that utilization of the present invention is sent by UE and passed on additional information.For example, these signals can comprise two examples of PRACH signature, and wherein, the first signature sends according to current RACH process, and the second signature is passed on additional information.Here, " first " might not represent in time more early.In addition, " pass on (convey) " represented that the selection of the second message (may with the first message combinations) has the implication setting in advance that makes network can infer some information, rather than the second message clearly comprises this information.

In Fig. 8 for use RACH as the situation of example exemplified with principle.Fig. 8 can compare with the Fig. 3 that shows the conventional RACH access procedure based on competition.Utilize as carried out the initial access of UE10 to system with reference to the RACH process of Fig. 3 general introduction, wherein, UE utilize choose at random can with signature in one send PRACH lead code.This (1) is in the drawings located to illustrate.

Can know and find out from Fig. 8, this form of the present invention relates to UE10 and sends additional RACH message to eNodeB20.For convenience's sake, this can be called as message 1 ', and represents with (1 ') in the drawings.Remaining RACH process is carried out in a conventional manner, wherein as usual sends message 2, message 3 and message 4.Note, follow after message 1 although Fig. 8 shows message 1 ', this is only schematic.These two RACH lead codes can send according to random order, or send simultaneously.

Can two signals be linked according to one or more in following principle :-

● use identical resource (for example, resource in, time domain/frequency domain/code territory)

● use the resource with the fixed interval of time upper limit

● use the resource with the fixed interval of upper frequency limit

● use the resource with the interval limiting in yard territory

About second principle in above principle, suppose such as the other factors of radio channel and keep identical, from the time difference between two PRACH message of same UE should be just in time an integer subframe.Generally there is the extra little skew (the little skew for example, causing due to different propagation paths) that can detect from the time difference between the PRACH message of different UE.

The possible different wave of each signal can for example, with being considered to different signatures (,, the in the situation that of PRACH, different signatures is corresponding to different preamble sequences).The in the situation that of PRACH, there are 64 available difference signatures, in these 64 signatures, select a signature can be considered as being equal to and send the nearly information of 6 bits.

Can directly indicate described additional information by the corresponding Numerical Index of a signature in may signing with a group that sends as a signal in multiple signals.Alternatively, some combination of numbers that can be by these index (difference of for example, index between the signature, sending by each signal in two signals or and) is indicated described information.Therefore, if represent each index by n1 and n2, described difference will be arithmetic value n1-n2 simply, and this value is by the implication that has some and set in advance.In the case of the resource for two signals (or other attribute) is also different, can for example, pass at least in part described information by some combination of used resource (, poor).

Conventionally, network generally can be confirmed: because two signals will have identical transmit timing and propagation delay, and therefore in the situation that there is no obvious relative timing difference, be received, so these two signals are sent and thereby will be linked by identical UE.But although preferably avoid these situations, for example, according to environment (, error situation) or execution mode, two identical signals may be sent by different UE.In this case, these two signals may have slightly different transmit timing and propagation delay, and therefore be received in the case of having slightly different relative timing.In most of the cases, network can be identified timing difference, thereby network will not consider these signals to link.This can't hinder network to link having to sign to be identified as such as first signature and second of the specific timing difference of an integer subframe.

Fig. 9 and Figure 10 summarized with this form of the present invention respectively the each party in UE10 and eNodeB20 locate carry out process.As already mentioned, the present invention is not limited to use PRACH, and therefore Fig. 9 and Figure 10 are exemplified with processing more generally than Fig. 8.

First consider the action (Fig. 9) of UE, at step S110, process and start, UE receives the notice of for example, resource to the channel/signal that will be used for paying close attention to (, PRACH).The in the situation that of PRACH, UE monitors downlink broadcast signal to obtain transmit timing.UE is also notified for random available signature, frequency band and the time slot accessing.

Then,, at step S120, UE for example selects, by the first message sending to network (, the message 1 in the amended PRACH process of Fig. 8).This for example may relate to, from least one group of predefined message (, PRACH signature) selects at random.

Then (step S130), UE utilizes the present invention to determine whether this stage needs to pass on additional information to network.If do not need (at S130, no), UE only utilizes the resource of notifying in S110 to send the first message, as shown in S140.

On the other hand, if UE wishes (or by network requirement) indication additional information, UE selects the message (message 1 ' of for example, describing about Fig. 8) of second link.Then, UE utilizes the resource of notifying in S110 to send two message to network.As already mentioned, the message of link not requiring according to any particular order sends.The message of link can send or send simultaneously according to any specific order, but in some cases, in the case of having the time delay of restriction between two message, transmit, the amount (for example, the quantity of subframe) of time delay has been passed on a part for information.

As shown at step S170, UE is for the RAR(message 2 such as Fig. 8) some form of carrying out automatic network response and monitor the down channel of appointment.

UE for example (in the situation that of PRACH) continues described process as required by sending message 3.

Simultaneously, with reference to Figure 10, at step S210, the process of network side (can conventionally pass through all processes that some action is carried out at eNodeB place in the more high-level coordination of network or indication) starts, network notice subscriber station will be used to the resource of channel/signal (for example, PRACH) of paying close attention to.

Then (step S220), eNodeB waits for the message receiving on the channel of paying close attention to, or receives the signal of paying close attention to.If do not receive this message (S220, no), regularly (for example,, after each frame) repetition S210 of eNodeB.

Once receive the first message (S220 is), eNodeB checks whether received according to of the present invention and the second message the first message linkage at S230.If UE is configured to different timed sending the first message and the second message, eNodeB waited for through reasonable time before S230 checks.

If do not receive the second message (S230, no), flow process proceeds to the transmission response of describing as firm, and still, if receive second message (S230 is) of link, eNodeB derives additional information by these two message in S240.For example, as already mentioned, eNodeB can be associated each signature with Numerical Index n1 and n2, and some information are derived in the combination setting in advance (such as poor n1-n2 or and the n1+n2 of index) based on these index.Alternatively (or additionally), eNodeB can detect that the integer subframe of being separated by receives signature, and in the case, this integer will represent some information.The character of this information is described about various execution modes below.

Then, in any case, eNodeB sends (S250) some response (RAR for example, sending via PDSCH in the case of the PRACH process of Fig. 8) to UE.Then, process continues (S260), for example to complete the conventional treatment joining with the channel of paying close attention to/signal correction.

It should be noted that, describe and supposed the first message and the second message that send link although upper, but this is not necessary, not existing of the second message itself just can be for to network indication information (need only UE and be configured to conventionally send the message of multiple links).

Conventionally, unless otherwise noted, execution mode described below is based on LTE, and wherein, network utilisation FDD operates and comprises that one or more eNodeB, each eNodeB control one or more descending community, and each descending community has corresponding uplink cells.One or more terminal (UE) can be served in each DL community, and one or more terminal can receive in this Serving cell the signal that sends and to described signal decoding.In order to control transfer resource in time domain, frequency domain and spatial domain for to UE transmission with from UE transmission, eNodeB is to the UE message (PDCCH) that transmits control channel.The described transfer of data of the general indication of PDCCH message is up (using PUSCH) or descending (use PDSCH), also indicates transfer resource and the out of Memory such as the quantity of quantity, the data rate of transmission mode, antenna port and the code word that enables etc.In addition, which reference signal PDCCH can indicate can be for drawing the phase reference for the demodulation of DL transmission.For different antenna ports but the reference signal that occupies identical position can be distinguished by different spreading codes.

In order to make eNodeB utilize suitable transformation parameter and resource to be dispatched to effective transmission of UE, each UE provides about for one, the feedback of the DL channel status of two or more Serving cells to controlling for the eNodeB of the Serving cell of this UE.

There is no to get rid of wherein each UE and can be configured to have in identical carrier frequency the situation of two or more Serving cells.In the case, conventionally will limit two groups of PRACH resources.May relate to some and coordinate (for example,, if community is controlled by different eNodeB, ideally they should know the PRACH resource in other community).

the indication of the first execution mode-visible antenna

In this first execution mode, in the meaning at the various diverse locations place in physical antenna is disposed in the overlay area of community, distribute and support the antenna of the community that UE accessed or used.Each antenna (or more correctly, each virtual-antenna or antenna port) be associated with a reference signal in a small group reference signal.UE can identify have the enough strong signal reference signal of those antennas of (, enough low path loss), but may not receive the reference signal from the whole antennas in community.Therefore, should be used to launch to UE in order to make network can easily identify which antenna, expectation network can determine UE can receive signal best from which antenna.

In the preferred version of this execution mode, according to LTE version 8, limit PRACH resource and send PRACH resource by aspect by network.According to the present invention, network can limit additional PRACH resource and send additional PRACH resource by aspect.In the time that RACH process is triggered, UE utilizes PRACH(in version 8 resources according to version 8) send the first signature, and utilize the PRACH in additional resource to send the second signature.This second signature indication UE is current receives reference signal (or can receive from which antenna port reference signal-this can determine by the amplitude of more different reference signals) from which antenna port.

This indication can utilize bitmap to complete, and wherein each bit is corresponding to the antenna port with sufficient received signal strength.Current 64 the different signatures (, 6 bits) of supporting of LTE, this will be enough to indicate the combination in any that reaches 6 antennas or antenna port.Alternatively, for reaching 8 antenna ports, can indicate one group of more limited combination (for example, any antenna+any two antennas+whole eight antennas+more several combinations ...).In response to this information, network will preferably only use indicated antenna to carry out at least some follow-up transmission to UE.The advantage of this scheme is by not reducing and disturb and the transmitting power of waste with the antenna that the power of transmitting cannot arrive UE.

In the modification of this execution mode, antenna (is for example divided into groups together, remote radio head (RRH:Remote Radio Head) by each position provides, and each RRH has one or more antenna), and indicated the observability of each group by UE.

the second execution mode-UE mark

As already mentioned, conventional PRACH preamble message does not comprise the mark of UE.In the second execution mode, the selection of the second signature is indicated to UE mark (or the part of the reduction version of mark or mark (such as the LSB of mark), be applied to result or the additional short mark of the hash function of mark).If the second signature is carried by LTE PRACH, owing to there being 6 powers of 64(2) individual possible signature, so this selection can be passed on the nearly id information of 6 bits.If the second signature for example,, by other means carryings (, on PUSCH), can be passed on more bit.This id information can make network can confirm more quickly UE mark, for example, avoided the needs of repeated configuration information and set up and the high data rate communication of UE with the minimum delay.Note, applicable UE mark can be only at UE, to set up while being connected ability available with network.

Routinely, in the message 3 of for example reference in the above after PRACH lead code conventionally, send ID.

As the modification of present embodiment, (indicated by performance class) UE ability can be passed on by the second signature.

As another modification of present embodiment, the second signature can indicate UE whether to tolerate delay (for example, requiring for current application).This will make network can according to priority process the RACH request from different UEs, or according to priority distributes UL/DL resource.

the 3rd enforcement Fang Shi – channel conditions

In the 3rd execution mode, the second signature indication is about the information of radio channel state.This can be according to some or all the form in the channel condition information (CSI) having limited for LTE down link, and wherein, CSI report can comprise order designator (RI), preferred precoder (PMI) and channel quality (CQI).This can make network to select suitable transmission mode and data rate for downlink data transmission.Can in the time determining the mandate how sending the resource for UE message transfer 3, use this information.Up to the present, do not need UE ID.

On the other hand, the 3rd execution mode can be with the second execution mode combination also to provide ID beyond the information about radio channel condition.

In the modification of present embodiment, the second signature can be indicated the disturbance regime (for example, the history of average interference level or interference) measuring at UE place.

In another modification of present embodiment, in the situation that system utilizes carrier aggregation to operate, the second signature can be indicated the channel quality of the DL carrier wave different from the carrier wave of carrier wave pairing with PRACH resource.Here, pairing is to suppose the pairing between UL carrier wave and DL carrier wave in the situation of FDD.In a lot of FDD situations, carrier wave occurs in pairs, but can have exception: for example, in CA, can have UL carrier wave and the DL carrier wave of varying number.Present embodiment makes network can determine rapidly whether additional carrier should be activated.

the 4th enforcement Fang Shi – buffer state

Buffer state reports process is used to provide to service eNodeB the information that can be used for the amount of the data of transmission in the upper line buffer about UE.

In the 4th execution mode, the buffer state (, waiting the amount of the information of uplink) at the second signature indication UE place.LTE defines for the buffer state reports of the transmission of media access control layer MAC (BSR).The subset of this information can utilize the present invention to provide.This makes the network can be rapidly for UL transfer of data is distributed applicable resource.

In the modification of present embodiment, the second signature indication UE whether with Network Synchronization (for example, except via PRACH, UE whether for UL transmission set up applicable timing).

In another modification of present embodiment, the second signature indication information (statistical measures of the error rate for example, PDSCH and/or PUSCH on observed) relevant with previous radio bearer setup complete.

the 5th enforcement Fang Shi – carrier aggregation

In the 5th execution mode, the communication between UE and network can be used the more than one community (, carrier aggregation) in different carrier frequencies simultaneously.In the case, the first signature is first or main plot (Pcell) is upper sends, and the second signature in the second Huo Fu community (Scell) upper transmission.

As the modification of present embodiment, the second transmission of signature on Scell indicated UE to using the preference (for example,, because the channel conditions in DL and/or UL is judged as better) of this community.

Within the scope of the invention, various modifications are possible.

Above-mentioned multiple execution mode can be adapted so that the first signature or the second signature (or the signal being equal to) can use any transmission in following up channel:

● PRACH(is as has been described): wherein, different signatures is corresponding to the different PRACH resources in different preamble sequences and/or time domain and/or frequency domain.As previously indicated, " signature " can be regarded as and transmit the general-purpose attribute (or one group of attribute) being associated.This sequence (this sequence determines waveform) is the most important attribute of PRACH lead code.Also can consider other attribute such as the time/frequency of transmission.

● PUCCH: wherein, different signatures is corresponding to different PUCCH resources.Every PUCCH RB(Resource Block) 12 cyclic shifts and 3 spreading codes nearly 36 combinations are available.

● SRS: wherein, different signatures is surveyed reference signal corresponding to different SRS() transmission.Survey the basis that reference signal provides uplink signal-channel quality information to determine as the scheduling in base station.UE sends and surveys reference signal in the different piece (wherein there is no available transmitting uplink data) of bandwidth.Survey reference signal sends in the last symbol of subframe.2 RPF(duplication factors) and nearly 16 combinations of 8 cyclic shifts available.In addition, can configure different bandwidth and frequency domain position.

● PUSCH: wherein, different signatures can be corresponding to different data contents.For to having access at random use, this modification is preferably restricted to little PUSCH resource size (for example, 1 or 2 RB).Preferably, be preconfigured such as the details of grouping dimension and modulation and encoding scheme.

The whole additional informations of multiple execution mode supposition the second signature carrying above.But, also can use and select the first signature to be used to indicate additional information (this carries out minimizing the quantity of the random signature of selecting).In the case, the first signature is signed as " common " by eNodeB, but UE can select modestly.

In the modification of above-mentioned multiple execution modes, the two can for example configure any or they in the first signature and the second signature according to the requirement of application or selection at random.

In the modification of above-mentioned multiple execution modes, whether the transmission of the second signature is optional, this means and can be sent out to convey a message according to the second signature.

In other modification of above-mentioned multiple execution modes, in order to send more information, can increase other signature.

Above behavior will configure by the behavior limiting in UE special RRC signaling, broadcast signaling (to enable this feature) or system specifications.Be not that whole UE need to be configured to move in the manner described above.For example, only pre-configured UE will send the indication of contemplated type.For other UE, eNodeB will conclude without any transmission.Alternatively, because competent UE can find self leaving in (legacy) network, for example, so can being included in broadcast (, SIB), information uses for applicable UE.Like this, above supposition will be suitable for.

Described the present invention with reference to LTE FDD, but the present invention also can be applied to LTE TDD and other communication system such as UMTS and WiMAX.

Any in execution mode above-mentioned and modification can be combined in same system.Although more than describe and make for LTE and LTE-A, the present invention also can be applied to the wireless communication system of other type.Therefore, in claim, quoting of " website " is intended to cover subscriber station, the relay station etc. of any type, and no matter that fix or mobile, and is not limited to the UE of LTE.

In any aspect of the present invention or execution mode of describing in the above, the software module that various features can be implemented as hardware or move on one or more processor.The feature of an execution mode can be applied to any other execution mode.

The present invention also provides computer program or the computer program for carrying out any method described herein and has stored the computer-readable medium of the program for carrying out any method described herein.

Realizing computer program of the present invention can be stored on computer-readable medium, or can be for example the form such as the signal of the Downloadable data-signal providing from internet website, or can be any other form.

It being understood that without departing from the scope of the claims, can make various changes and/or modification to described specific implementations.

industrial applicibility

Therefore, embodiments of the present invention allow the random access in LTE UE to process earlier to send more useful information in this process.This is generally that signal by sending two links (for example, two PRACH signatures that simultaneously send) is realized.By selecting secondary signal/signature, indicate (in other words, being inferred by network) additional information (for example, UE mark or buffer state).This makes LTE network to reach more rapidly and send and/or receive the more state of high data rate than current RACH process, thereby has reduced the stand-by period and improved user's experience.This is that (quantity that for example, can need to sign by increase is simply indicated more information) realizes in the case of the obvious extra complexity that does not need network.

Claims

1. a wireless communications method, wherein, website is carried out transmission, and described transmission is characterized by least one signature in the up link to cordless communication network, and described website is by representing information with lower at least two to described network:

Selection to signature from predefined at least one group of signature;

The quantity of the signature sending.

2. wireless communications method according to claim 1, wherein, described transmission comprises at least two signatures, and described at least two signatures are by getting up with at least one lower link: the time interval between the timing of the transmission of described signature or the transmission of described signature; Frequency interval between the frequency of described signature or described signature; And the interval of code in Huo Ma territory, territory.

3. wireless communications method according to claim 1 and 2, wherein, each signature is associated from different Numerical Indexs, described information represented at least in part by described Numerical Index, or the in the situation that of two or more signatures being incorporated into small part and representing by two or more Numerical Indexs.

4. according to claim 2 or quote the wireless communications method claimed in claim 3 of claim 2, wherein, described signature in described resource, regularly, difference aspect frequency or at least one in territory of code, and described information is represented at least in part by described difference.

5. according to wireless communications method in any one of the preceding claims wherein, wherein, described transmission is via with lower one or more: Random Access Channel, the random access procedure based on competition of its subscriber station for described network; Ascending control channel; Reference signal; And Uplink Shared Channel.

6. wireless communications method according to claim 5, wherein, described transmission is via described Random Access Channel and comprise at least two signatures, in described at least two signatures first signatures is selected for the object of described random access procedure, and the signature of second in described at least two signatures is in order to represent described information and to select individually or with described the first signature combination.

7. according to wireless communications method in any one of the preceding claims wherein, wherein, described information is used to indication with lower at least one: at least one down link to the visible antenna of described website; The mark of described website; The ability of described website; The delay tolerance of described website; Channel conditions on the down link of at least one community; The buffer state at described website place; Described website is about the synchronous regime of described network; And about the information of previous radio bearer setup complete.

8. according to wireless communications method in any one of the preceding claims wherein, wherein, described website is via multiple communities and described network service, and described transmission is included on the first community, to send the first signature and be included in alternatively and on the second community, sends the second signature.

9. wireless communications method according to claim 8, wherein, channel conditions on the down link of described the second community and/or the described website preference for the communication via described the second community is indicated in the transmission of described the second signature.

10. according to wireless communications method in any one of the preceding claims wherein, wherein, described transmission comprises two or more signatures, and a quilt in described signature is selected at random.

11. according to wireless communications method in any one of the preceding claims wherein, and wherein, described network is the network based on LTE.

12. according to wireless communications method in any one of the preceding claims wherein, wherein, described transmission comprises a PRACH signature and the 2nd PRACH signature, wherein, PRACH is the Physical Random Access Channel limiting in LTE, described the first signature is used to ask accidental access response RAR according to the RACH process limiting in LTE, and described the second signature is used to indicate the object of described information, and described signature is corresponding to each PRACH preamble sequence limiting in LTE.

13. 1 kinds of wireless communication systems, this wireless communication system is according to operating according to method in any one of the preceding claims wherein.

14. 1 kinds of subscriber stations, this subscriber station is according to the website using in the method described in any one in claim 1 to 12, and is configured to sign and selects to represent described information to described network.

15. 1 kinds of base station equipments, this base station equipment is according to using in the wireless communications method described in any one in claim 1 to 12, and is configured to from described transmission, extract described information by recovering described signature or each signature.

16. computer-readable instructions, described computer-readable instruction makes described device that subscriber station according to claim 14 or base station according to claim 15 are provided in the time being carried out by the processor of the transceiver devices in wireless communication system.