CN101547022A - Method and device for sending SRS in LTE TDD system - Google Patents
Method and device for sending SRS in LTE TDD system Download PDFInfo
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Abstract
A method for sending an uplink sounding reference signal SRS comprises the following steps: acquiring a cycle parameter of an uplink channel resource which can be used for transmitting the sounding reference signal SRS and a position of an SC-FDMA symbol; and if the cycle parameter is 2 ms or 5 ms, sending an SRS signal generated in advance through an obtained actual cycle by UE. The method can guarantee the effect of sending the SRS signal periodically by LTE FDD; in addition, compared with LTE FDD, the method does not increase downlink signaling cost of a system, ensures the frequency and the quantity of the SRS transmission, and achieves the aim of monitoring an uplink wireless channel by the system.
Description
Technical field
The present invention relates to communication system, particularly relate to the method and apparatus that sends SRS (SoundingReference Signal) in the communication system.
Background technology
(The 3 for 3GPP
RdGeneration Partner Project) standardization body is carrying out the formulation of new generation of wireless communication standard, and this standard name is LTE (Long Term Evolution).On physical layer interface, new standard has adopted the technology with traditional C DMA (the Code Division Multiple Access) OFDM that technology is different (Orthogonal Frequency Division Multiplexing), adopt the OFDMA mode at down link, adopt SC-FDMA (Single CarrierFrequency Division Multiple Access) in up link.This new standard technique can adopt the complexity of the traditional time domain equalization of frequency domain equalization operation the reduction effectively to the anti-multipath transmission, is more suitable for being applied to the broadband high-speed transfer of data.
The LTE standard technique can be divided into TDD (Time Division Duplex) and FDD (Frequency Division Duplex) two classes from air interface, the LTE system supports bandwidth varying, the typical bandwidth of supporting comprises 1.4,3,5,10,15 and 20MHz, can satisfy the demand of different scenes.
The physical layer frame structure of LTE FDD system is shown in figure one: the length of radio frames (101:Radio Frame) is 10ms, (102 is subframes to each radio frames: Radio Sub-frame) form by 10 wireless sub-frames, the duration of each wireless sub-frame is 1ms, each wireless sub-frame is made up of 2 time slots (103 is time slots), and the duration of each time slot is 0.5ms.
The physical layer frame structure of LTE TDD system is with reference to shown in the figure two: the length of radio frames (201) is 10ms, each radio frames is made up of 10 wireless sub-frames (204 is wireless sub-frames), the duration of each wireless sub-frame is 1ms, 5 continuous wireless sub-frames are formed a field (202), and the duration of field is 5ms.Different with LTE FDD system is, the 1st wireless sub-frame (211) in the LTE TDD radio frames and the 6th wireless sub-frame (212) are 2 special subframes, the duration of special subframe is 1ms, constitute by 3 special time slots, these 3 special time slots are defined as DwPTS (205 or 208) respectively, GP (206 or 209) and UpPTS (207 or 210).Wherein, DwPTS time slot, GP time slot and UpPTS time slots variable-length, concrete numerical value be by system configuration, the constant 1ms that equals of total time length.8 subframes of except 2 special subframes other are made up of 2 time slots (203 is time slots) respectively, and each time slots length is 0.5ms.According to present discussion result, subframe 0, subframe 5 and DwPTS are fixed for downlink transfer, and subframe 2 is fixed for uplink.
LTE TDD system can be divided into structure and the structure of 10ms change-over period of 5ms change-over period.In the structure of 5ms change-over period, the structure of two fields is identical.In the LTE tdd frame structure that with 10ms is the change-over period, the structure (304,305) inequality of the field that two time spans that constitute a 10ms cycle whole frame (308) are 5ms.As required, the time span that subframe 6 (307) can be configured as transmitting downlink data is the subframe of 1ms, and subframe 6 (307) can be configured as also that with subframe 1 (306) time span of same structure to be arranged be the special subframe of 1ms.The LTE TDD system that has the different switching cycle (5ms cycle or 10ms cycle) can become different up-downgoing allocation proportions by network configuration.
At two kinds is respectively to be in the LTE TDD structure in cycle with 5ms and 10ms, and UpPTS is made up of 1 or 2 SC-FDMA symbols, and concrete numerical value is by system configuration.When UpPTS was made of 2 SC-FDMA symbols, UpPTS was used to transmit short Random Access Channel (Short RACH) or SRS (Sounding Reference Signal: monitor reference signal) signal or transmits Short RACH channel simultaneously and the SRS signal; When UpPTS was made of 1 SC-FDMA symbol, UpPTS was used for transmitting the uplink SRS signal.The uplink channel resources that can be used for doing uplink in the LTE TDD system comprises UpPTS channel (being made up of 1 or 2 SC-FDMA symbols) and upstream data subframe, and the user selects suitable ascending resource transmission uplink information according to system configuration and scheduling.
In the LTE system, according to network scheduling, UE (User Equipment: user terminal) send the SRS signal to eNodeB (base station in the evolved NodeB:LTE system).The main effect of SRS signal has: eNodeB is by detecting the SRS signal, estimation is the channel quality of UE in the eNodeB link on the channel of transmitting SRS, UE is done regularly follows the tracks of and finish closed power control thereby carry out frequency selectivity data dispatch, eNodeB.
(3GPP:The 3 according to present 3GPP
RdGeneration Partnership Project, third generation partnership project, be the International Standards Organization that is engaged in mobile communication standardization) the standardized progress of LTE FDD: (1) SRS is in the transmission of given subframe, and the SRS transmission will be used the some or all of temporal frequency resource in the SC-OFDM symbol that subframe begins or finish.A symbol except beginning or end in the transmission subframe may be used as the SRS transmission, and other SC-FDMA symbol is not used in the SRS transmission.(2) when the UpPTS that is made up of 2 SC-FDMA symbols is used for transmitting SRS, may 2 SC-FDMA symbols can be used for the transmitting SRS signal, also may have only a SC-FDMA symbol to be used for the transmitting SRS signal, content of the present invention does not limit specifically has among the UpPTS 1 or 2 SC-FDMA symbols be used for the transmitting SRS signal, when standard determined that UpPTS has 1 SC-FDMA symbol to be used for the transmitting SRS signal, it was that first or last SC-FDMA symbol are used for the SRS transmission that the present invention does not limit.
According to the standardized progress of present 3GPP, LTE FDD system comprises about the Main Conclusions of SRS transmission:
(1) eNodeB by D-BCH (Dynamic Broadcasting Channel: Dynamic Broadcast Channel) notice UE information, comprising:
-according to scheduling, cyclical transmission SRS in some sub-frame of uplink, then the informational needs of some subframe of transmitting SRS is broadcasted in D-BCH.
(2) eNodeB comprises by the information of RRC (control of RRC:Radio Resource Control Radio Resource) signaling UE:
The transmission cycle of-SRS: from 2,5,10,20,40,80,160, a numerical value of selecting among the 320}ms;
The cyclic shift of-SRS (CS:Cyclic Shift: cyclic shift) value;
Comb number of using of-SRS: can be comb0 or comb1.In the wireless running time-frequency resource of the SC-FDMA of transmitting SRS (consisting of a plurality of sub-carriers), the frequency resource of transmitting SRS signal will be divided into 2 groups according to the principle that is spaced apart a subcarrier, and each group is referred to as a comb, is designated as comb 0 or comb 1;
The transmission bandwidth of-SRS can be broadband SRS or arrowband SRS;
The position of the initial frequency resource of-SRS in subframe.
According to the progress of present research on standard, the SRS method for designing of LTE TDD and the problem that runs into are as follows:
Suppose that the SRS transmission principle that SRS transmits in design and the LTE FDD system in the LTE TDD system is consistent, then under the prerequisite of LTE FDD appropriate design SRS, can guarantee that the needs that system carries out the wireless channel monitoring are satisfied in the SRS transmission in the LTE TDD system.SRS transmission according to this thinking design LTE TDD system, find in the research: in LTE FDD system, uplink is used different frequency ranges with downlink transfer, guaranteed to see and to have carried out uplink in time continuously from system perspective, pass through base station scheduling, the scheduling sub-frame resources is according to SRS cycle of appointment transmitting SRS regularly in the uplink frame of 10ms, because there are maximum 10 possible subframes to do uplink in the radio frames of 10ms, can therefrom find the cycle is Radio Resource (frequency resource in the subframe on the given SC-FDMA symbol) transmitting SRS of 2ms or 5ms.But, in LTE TDD system, no matter be for 5ms transfer point periodic structure or 10ms transfer point periodic structure, all both comprised in cycle at transfer point that the uplink subframe also comprised the downlink transfer subframe, the cycle that just may can not find available 2ms or 5ms like this in the configuration of seven kinds of standard supports of all LTE TDD is done the SRS transmission.
According to the problem that runs in the last surface analysis LTE TDD SRS transmission design, the method of using at present the cycle parameter of 2ms and 5ms that the SRS transmission cycle is set in LTE FDD system needs redesign in LTE TDD system, otherwise the UE in the LTE TDD system receives the SRS week after date of system call, possibly can't find suitable uplink channel resources transmitting SRS.
In order to address this problem, this patent proposed a kind of new in LTE TDD system the method and apparatus of transmitting SRS.Adopt this invention, the UE that can make LTE TDD system finds the appropriate wireless resources transmitting SRS according to the SRS dispatch that network base station sends, thereby the uplink wireless channel monitoring can be done according to the SRS signal in the base station of LTE TDD.The present invention is with reference to being that cycle parameter is dispatched UE and sent the SRS signal with 2ms and 5ms in the LTE FDD system, how newly proposed LTE TDD system in conjunction with the design feature of LTE TDD utilizes 2ms and 5ms cycle parameter to obtain the method and apparatus that suitable wireless time frequency resource is come transmitting SRS, make that the frequent degree of LTE TDD transmitting SRS signal and quantity and LTE FDD are approaching, thereby satisfy in the LTE TDD communication system requirement the SRS transmission performance.
Summary of the invention
The method and apparatus that the purpose of this invention is to provide a kind of LTE of being used for TDD communication system transmitting SRS signal.
According to the one side of invention, the sending method of a kind of uplink detection reference signal SRS comprises step:
A) obtain to can be used for to transmit the cycle parameter of uplink channel resources of detection reference signal SRS and the position of SC-FDMA symbol;
B) if described cycle parameter is 2ms or is 5ms that UE sends the SRS signal that generates in advance with the actual cycle that obtains.
According to invention on the other hand, a kind of LTE TDD UE sends the device (406) of SRS, is made of lower part:
Module 401 is used to produce the SRS sequence;
Module 402 is used to receive the SRS configuration information;
Module 403 is used to receive the SRS transmitting scheduling information;
Controller 404 is used to send the SRS sequence;
Module 405 is used to adjust power factor.
Description of drawings
Fig. 1 is the frame structure schematic diagram of LTE FDD;
Fig. 2 is the frame structure schematic diagram of LTE TDD;
Fig. 3 is to be the LTE TDD structural representation in transfer point cycle with 10ms;
Fig. 4 is the installation drawing of UE transmitting SRS;
Fig. 5 is the schematic diagram of embodiment 1;
Fig. 6 is the schematic diagram of embodiment 2;
Fig. 7 is the schematic diagram of embodiment 3;
Fig. 8 is the schematic diagram of embodiment 4.
Embodiment
The present invention propose a kind of in LTE TDD system the method and apparatus of transmitting SRS.Concrete method comprises following step:
1) network configuration can be used for the uplink channel resources of transmitting SRS signal;
2) UE selects appointment in the uplink channel resources that can be used for the transmitting SRS signal of network configuration uplink channel resources transmitting SRS signal is dispatched to the dispatch that UE sends transmitting SRS in the base station;
3) UE receives the uplink channel resources information that can be used for the transmitting SRS signal of network configuration and the dispatch of transmitting SRS;
4) UE sends the SRS signal that generates in advance on the uplink channel resources of network scheduling.
In the invention step 1), network can be by can be used for the uplink channel resources of transmitting SRS signal in the D-BCH configuration-system, promptly be configured in the LTE TDD system number of sub-frame of uplink that can transmitting SRS and the position of concrete subframe by the D-BCH channel, this both can use the method for bit mapping graph (Bit Map) to realize, also can be by exhaustive all resource situation, such as being n, getting then with 2 is that the logarithm at the end disposes and (promptly adopts bit number to be: ceil (log2 (n))).
When using D-BCH to dispose the physical resource of transmitting SRS, can be in two sub-sections.Part one: the situation of configuration UpPTS transmitting SRS
No matter 5ms still is the transfer point cycle of 10ms in the LTE TDD system, forms the number of SC-FDMA symbol of UpPTS or 1 or 2, and concrete numerical value can be disposed in P-BCH or D-BCH by system.Situation for the 10ms transfer point cycle, the present invention's regulation, the SC-FDMA number of forming UpPTS among subframe #1 (306) and the subframe #6 (307) is identical, promptly all equals 1 or all equal 2, can simplified system design under the prerequisite that does not influence systematic function like this.
When UpPTS is made up of a SC-FDMA symbol, directly defines it and be used for the SRS transmission; When UpPTS is made up of two SC-FDMA symbols, there is following several different methods definition wherein to be used for the physical resource of SRS transmission, comprise
Submethod 1: define first SC-FDMA symbol and be used for the SRS transmission
Submethod 2: define second SC-FDMA symbol and be used for the SRS transmission
Submethod 3: define two SC-FDMA symbols and all be used for the SRS transmission
In LTE TDD, (ratio of sub-frame of uplink and descending sub frame quantity in the radio frames of a 10ms) different according to system configuration because the proportioning of up-downgoing and different, form one has been represented LTE
All seven kinds of proportioning situations that the TDD standard is supported.
In the form one, the number of concrete sub-frame of uplink will be with configuration the determining of sequence number, and concrete configuration sequence number can be broadcasted in D-BCH.For the configuration in 5ms transfer point cycle, in each field, upstream data subframe (other upstream data subframes except UpPTS) has 3,2 or 1; For the configuration in 10ms transfer point cycle, in each frame, the upstream data subframe has 3, and 2,1 or 5.So, these subframes can all or part ofly be used for the transmitting SRS signal.At different configuration sequence numbers, specifically use signaling to indicate to be used for the number of sub-frames of transmitting SRS and concrete subframe position to be exemplified below,
Form one: LTE TDD ascending-descending subframes distributes possible configuration
First kind of UpPTS configuring condition: supposition UpPTS is made up of a SC-FDMA symbol, and supposes whether the interior SCFDMA symbol of UpPTS is used for SRS and needs the signaling indication.
For configuration sequence number 0, each 5ms has 4 upward position transmitting SRSs in the cycle, considers that having 0,1,2,3 or 4 upward position is used for transmitting SRS, and so possible position grouping just has:
Kind, can finish the indication of SRS transmission subframe so with 4 bit signallings, numerical value 0 just expression is not used in the subframe that SRS transmits, and data 15 just represent that UpPTS and subframe # 2, #3 and #4 are used for the sub-frame of uplink transmission.In the case, also can use the method for bit mapping to indicate, such as: 0000 expression is not used in the subframe of SRS transmission, and 0110 just represents that subframe # 2 and subframe # 3 are used for the sub-frame of uplink transmission.
The rest may be inferred so, can obtain supposing that UpPTS is made up of under the situation a SC-FDMA symbol, and under the situation of configuration sequence number 1 and 2, the indication bit number that needs is respectively 3 and 2 bits.
In standardized protocol specification, both can use the bit of different numbers to represent to be used for the subframe of uplink SRS at the situation that difference disposes sequence number, come indexed resource with 4,3 and 2 bits respectively such as the situation that at the configuration sequence number is 0,1 and 2; Also can be in order to simplify and the integrated system form, unified sub-frame of uplink number and position of using the longest bit number to represent to be used for the uplink SRS transmission is such as the unified indication of 4 bits concrete SRS transmission takies under the 5ms transfer point cycle physics number of subframes and the position of using.Perhaps, the bit number of fixing indication SRS position is k, and the value of k is more than or equal to 0 and less than 4.Here, can whether be used for SRS with the symbol in the bit indication UpPTS; When the sub-frame of uplink number in the field during greater than k-1, a predefine k-1 wherein subframe can transmitting SRS, for example, and a preceding k-1 sub-frame of uplink, and with remaining k-1 bit indication.
Adopt identical principle,, come indexed resource with 4,3 and 2 bits respectively the configuration sequence number 3,4 and 5 of 10ms change-over period; Also can be in order to simplify and the integrated system form, unified sub-frame of uplink number and position of using the longest bit number to represent to be used for the uplink SRS transmission is such as the indication of unified use 4 bits.Perhaps, the bit number of fixing indication SRS position is k, and the value of k is more than or equal to 0 and less than 4.Here, can whether be used for SRS with the symbol in the bit indication UpPTS; When the sub-frame of uplink number in the field during greater than k-1, a predefine k-1 wherein subframe can transmitting SRS, for example, and a preceding k-1 sub-frame of uplink, and with remaining k-1 bit indication.
To the sub-frame of uplink number difference 1 in 6, two fields of configuration sequence number, at this moment, can stipulate that the SRS number in two fields is the same with position distribution, and dispose according to the fewer field of sub-frame of uplink number, promptly adopt the indication of 3 bits; Perhaps, can stipulate that the SRS number in two fields is the same with position distribution, and the field many according to the sub-frame of uplink number disposes, promptly adopt 4 bits, at this moment, if distributed subframe 4 to be used for SRS, and the corresponding subframe in the fewer field of sub-frame of uplink number (being subframe 9) is not a sub-frame of uplink, then think few SRS position in the fewer field of sub-frame of uplink number automatically.Perhaps, the bit number of fixing indication SRS position is k, and the value of k is more than or equal to 0 and less than 3.Here, can whether be used for SRS with the symbol in the bit indication UpPTS; When the sub-frame of uplink number in the field during greater than k-1, a predefine k-1 wherein subframe can transmitting SRS, for example, and a preceding k-1 sub-frame of uplink, and with remaining k-1 bit indication.
For the form of simplified system standard further, can not consider 5ms or 10ms the transfer point cycle difference and the signaling bit of unified needs is set to 4 bits, the signaling bit of perhaps unifying needs is set to the k bit, and the value of k is more than or equal to 0 and less than 4.To the 5ms change-over period, the position of the SRS of this information indication in each field; To the configuration 3,4 and 5 of 10ms change-over period, the position of the SRS that this information indication (is comprising in the field of line time) in each radio frames in other words conj.or perhaps; To the configuration 6 of 10ms change-over period, the position of the SRS of this information indication in each field.
To disposing the sub-frame of uplink number difference 1 in 6, two fields of sequence number, another method of distributing SRS is to allow SRS to be distributed in difference in these two fields.This is to need 7 bits to indicate first field 4 bits and second field 3 bit.
For the form of simplified system standard, all signaling bit that dispose the frame format unification needs of sequence numbers are set to 8 bits.Thereby 8 bits are indicated the SRS distribution condition of corresponding sub-frame of uplink respectively.Here, to the 5ms change-over period, preceding 4 bits and back 4 bits are indicated the SRS position in the field respectively; To the 10ms change-over period, preceding 4 bits are used to indicate the position of the SRS in first field; To the configuration 6 of 10ms change-over period, preceding 7 positions that bit is used to indicate SRS.Perhaps, the signaling bit of unified needs is set to the 2k bit, and to the 5ms change-over period, k bit of a preceding k bit and back indicated the SRS position in the field respectively; To the 10ms change-over period, a preceding k bit is used to indicate the position of the SRS in first field; To the configuration 6 of 10ms change-over period, k bit of a preceding k bit and back indicated the SRS position in the field respectively.Consider that FDD may adopt 10 bit bits to shine upon and indicate the position that disposes SRS, possible multiplexing this form of TDD, the signaling bit of promptly unifying needs is set to 10 bits, and UpPTS corresponds to subframe 1 and/or subframe 6, thereby 10 bits are indicated the SRS distribution condition of corresponding subframe respectively.
Second kind of UpPTS configuring condition: supposition UpPTS is made up of a SC-FDMA symbol, and the SCFDMA symbol predefine in the hypothesis UpPTS is used for the SRS transmission.
For configuration sequence number 0, each 5ms is in the cycle, and except that UpPTS, other has 3 sub-frame of uplink, in these 3 sub-frame of uplink, has 0,1,2 or 3 subframe and is used for transmitting SRS, and so possible position grouping just has:
Kind, can finish the indication of SRS transmission subframe so with 3 bit signallings.In the case, also can use the method for bit mapping to indicate, such as: 000 expression is not used in the subframe of SRS transmission, and 110 just represent that subframe # 2 and subframe # 3 are used for the sub-frame of uplink transmission.
The rest may be inferred so, can obtain supposing that UpPTS is made up of under the situation a SC-FDMA symbol, and under the situation of configuration sequence number 1 and 2, the indication bit number that needs is respectively 2 and 1 bit.
In standardized protocol specification, both can use the bit of different numbers to represent to be used for the subframe of uplink SRS at the situation that difference disposes sequence number, come indexed resource with 3,2 and 1 bit respectively such as the situation that at the configuration sequence number is 0,1 and 2; Also can be in order to simplify and the integrated system form, unified sub-frame of uplink number and position of using the longest bit number to represent to be used for the uplink SRS transmission is such as the unified indication of 3 bits concrete SRS transmission takies under the 5ms transfer point cycle physics number of subframes and the position of using.Perhaps, the bit number of fixing indication SRS position is k, and the value of k is more than or equal to 0 and less than 3.Here, when the sub-frame of uplink number in the field during greater than k, a predefine k wherein subframe can transmitting SRS, for example, and a preceding k sub-frame of uplink.
Adopt identical principle,, come indexed resource with 3,2 and 1 bit respectively the configuration sequence number 3,4 and 5 of 10ms change-over period; Also can be in order to simplify and the integrated system form, unified sub-frame of uplink number and position of using the longest bit number to represent to be used for the uplink SRS transmission is such as the indication of unified use 3 bits.Perhaps, the bit number of fixing indication SRS position is k, and the value of k is more than or equal to 0 and less than 3.Here, when the sub-frame of uplink number in the field during greater than k, a predefine k wherein subframe can transmitting SRS, for example, and a preceding k sub-frame of uplink.
To the sub-frame of uplink number difference 1 in 6, two fields of configuration sequence number, at this moment, can stipulate that the SRS number in two fields is the same with position distribution, and dispose according to the fewer field of sub-frame of uplink number, promptly adopt the indication of 2 bits; Perhaps, can stipulate that the SRS number in two fields is the same with position distribution, and dispose, promptly adopt the indication of 3 bits according to the many fields of sub-frame of uplink number.At this moment, if distributed subframe 4 to be used for SRS, and the corresponding subframe in the fewer field of sub-frame of uplink number (being subframe 9) is not a sub-frame of uplink, then thinks few SRS position in the fewer field of sub-frame of uplink number automatically.Perhaps, the bit number of fixing indication SRS position is k, and the value of k is more than or equal to 0 and less than 2.Here, when the sub-frame of uplink number in the field during greater than k, a predefine k wherein subframe can transmitting SRS, for example, and a preceding k sub-frame of uplink.
For the form of simplified system standard, can not consider 5ms or 10ms the transfer point cycle difference and the signaling bit of unified needs is set to 3 bits, the signaling bit of perhaps unifying needs is set to the k bit, the value of k is more than or equal to 0 and less than 3.To the 5ms change-over period, the position of the SRS of this information indication in each field; To the configuration 3,4 and 5 of 10ms change-over period, the position of the SRS that this information indication (is comprising in the field of line time) in each radio frames in other words conj.or perhaps; To the configuration 6 of 10ms change-over period, the position of the SRS of this information indication in each field.
To disposing the sub-frame of uplink number difference 1 in 6, two fields of sequence number, another method of distributing SRS is to allow SRS to be distributed in difference in these two fields.This is to need 5 bits to indicate first field 3 bits and second field 2 bit.
For the form of simplified system standard, all signaling bit that dispose the frame format unification needs of sequence numbers are set to 6 bits.Thereby 6 bits are indicated the SRS distribution condition of corresponding sub-frame of uplink respectively.Here, to the 5ms change-over period, the SRS position in the general sub-frame of uplink in preceding 3 bits and field of back 3 bits indication; To the 10ms change-over period, preceding 3 bits are used to indicate the position of the interior SRS of the general sub-frame of uplink in first field; To the configuration 6 of 10ms change-over period, preceding 5 positions that bit is used to indicate SRS.Perhaps, the signaling bit of unified needs is set to the 2k bit, and the value of k is more than or equal to 0 and less than 3.To the 5ms change-over period, k bit of a preceding k bit and back indicated the SRS position in the field respectively; To the 10ms change-over period, a preceding k bit is used to indicate the position of the SRS in first field; To the configuration 6 of 10ms change-over period, k bit of a preceding k bit and back indicated the SRS position in the field respectively.
Constitute by 2 SC-FDMA symbols for UpPTS, and may be used to the situation of transmitting SRS.Corresponding to above-described first kind of UpPTS configuring condition, suppose promptly whether each interior SCFDMA symbol of UpPTS is used for SRS and needs the signaling indication, adopt the bit mapping method, many 1 when then indicating the bit number of SRS resource location only to comprise a SCFDMA symbol than UpPTS.Corresponding to above-described second kind of UpPTS configuring condition, be that one or two interior SCFDMA symbols of predefine UpPTS are used for SRS, thereby do not need one or more SCFDMA symbol in the signaling indication UpPTS to be used for SRS, identical when then indicating the bit number of SRS resource location only to comprise a SCFDMA symbol with UpPTS.
In last standardization agreement, both can design the bit that signaling needs according to the bit number of maximum needs, the bit number of the indication SRS position below promptly unified each configuration sequence number; Also can design the bit number that signaling needs respectively according to the difference of the SC-FDMA number (1 or 2) that disposes the different of sequence number and composition UpPTS.
In the superincumbent indicating means,, can increase some and retrain the signaling bit number of saving the needs use for the number of subframes and the position of indicating transmitting SRS.Such as, agreement has only continuous SC-FDMA symbol can be used for transmitting SRS (subframe that is meant two SC-FDMA symbol places continuously is continuous subframe in time) etc.Promptly 1 or 2 SC-FDMA that comprises except that UpPTS is used for the SRS transmission according to pre-defined mode, and it is to distribute according to ascending order from first sub-frame of uplink (subframe 2 or subframe 7) beginning that system also can arrange the SRS resource; Perhaps, the SRS resource is that last subframe (subframe 4 or subframe 9) beginning from each up transmitting time section distributes according to descending.The method of the sub-frame of uplink of another kind of configuration transmitting SRS is described below.According to the difference of the up-downgoing ratio of TDD system, the number that is used for the Resource Block of control channel in each sub-frame of uplink may be different.At this moment, can be preferentially in the fewer sub-frame of uplink of the Resource Block number that the control signaling takies transmitting SRS, thereby SRS can transmit in the bandwidth than broad, this helps utilizing the symmetry of TDD channel to carry out the scheduling of downlink resource with SRS.
With above-mentioned be example to second kind of UpPTS configuring condition, for the configuration sequence number 0, each 5ms is in the cycle, except that UpPTS, other has 3 sub-frame of uplink, in these 3 sub-frame of uplink, have 0,1,2 or 3 subframe and be used for transmitting SRS, like this, need 2 bits finish the indication of SRS transmission subframe.That is, 0 expression is not used in the subframe of SRS transmission, and 2 just represent that two continuous subframes (for example, subframe # 2 and subframe #3) are used for the SRS transmission.Similarly, under the situation of configuration sequence number 1 and 2, the indication bit number that needs is respectively 2 and 1.
Similarly, to the configuration sequence number 3,4 and 5 of 10ms change-over period, come indexed resource with 2,2 and 1 bit respectively; Also can be in order to simplify and the integrated system form, unified sub-frame of uplink number and position of using the longest bit number to represent to be used for the uplink SRS transmission is such as the indication of unified use 2 bits.Perhaps, the bit number of fixing indication SRS position is k, and the value of k is more than or equal to 0 and less than 2.Here, when the sub-frame of uplink number in the field during greater than k, a predefine k wherein subframe can transmitting SRS; When the sub-frame of uplink number in the field during less than k, then the number of subframes of transmitting SRS is subject to the number of actual sub-frame of uplink.
To the sub-frame of uplink number difference 1 in 6, two fields of configuration sequence number, at this moment, can stipulate that the SRS number in two fields is the same with position distribution, and dispose according to the fewer field of sub-frame of uplink number, promptly adopt the indication of 2 bits; Perhaps, can stipulate that the SRS number in two fields is the same with position distribution, and dispose that the bit number that at this moment needs remains 2 bits according to the many fields of sub-frame of uplink number.At this moment, if distributed subframe 4 to be used for SRS, and the corresponding subframe in the fewer field of sub-frame of uplink number (being subframe 9) is not a sub-frame of uplink, then thinks few SRS position in the fewer field of sub-frame of uplink number automatically.Perhaps, the bit number of fixing indication SRS position is k, and the value of k is more than or equal to 0 and less than 2.Here, when the sub-frame of uplink number in the field during greater than k, a predefine k wherein subframe can transmitting SRS; When the sub-frame of uplink number in the field during less than k, then the number of subframes of transmitting SRS is subject to the number of actual sub-frame of uplink.
In standardized protocol specification, both can use the bit of different numbers to represent to be used for the subframe of uplink SRS at the situation that difference disposes sequence number.For example, be that 0,1 and 2 situation is come indexed resource with 2,2 and 1 bit respectively at the configuration sequence number; For the form of simplified system standard, can not consider 5ms or 10ms the transfer point cycle difference and the signaling bit of unified needs is set to 2 bits, the signaling bit of perhaps unifying needs is set to the k bit, the value of k is more than or equal to 0 and less than 2.To the 5ms change-over period, the position of the SRS of this information indication in each field; To the configuration 3,4 and 5 of 10ms change-over period, the position of the SRS that this information indication (is comprising in the field of line time) in each radio frames in other words conj.or perhaps; To the configuration 6 of 10ms change-over period, the position of the SRS of this information indication in each field.
To disposing the sub-frame of uplink number difference 1 in 6, two fields of sequence number, another method of distributing SRS is to allow SRS to be distributed in difference in these two fields.This is to need 4 bits to indicate its SRS configuration in the 10ms radio frames, and preceding 2 bits and back 2 bits indicate first field and second field 2 interior SRS to distribute respectively.Like this,, all signaling bit that dispose the frame format unification needs of sequence numbers are set to 4 bits for the form of simplified system standard, thus the SRS configuration in the indication 10ms radio frames.Here, to the 5ms change-over period, the SRS position in the general sub-frame of uplink in preceding 2 bits and field of back 2 bits indication; To the 10ms change-over period, preceding 2 bits are used to indicate the position of the interior SRS of the general sub-frame of uplink in first field; To the configuration 6 of 10ms change-over period, the SRS position in the general sub-frame of uplink in preceding 2 bits and field of back 2 bits indication.Perhaps, the signaling bit of unified needs is set to the 2k bit, and the value of k is more than or equal to 0 and less than 2.To the 5ms change-over period, k bit of a preceding k bit and back indicated the SRS position in the field respectively; To the 10ms change-over period, a preceding k bit is used to indicate the position of the SRS in first field; To the configuration 6 of 10ms change-over period, k bit of a preceding k bit and back indicated the SRS position in the field respectively.
Top method is the number of sub-frames of each field in the radio frames being indicated the transmitting SRS except that UpPTS respectively, also can only send the number of sub-frames that a parameter m is indicated the transmitting SRS except that UpPTS in the radio frames.To configuration sequence number 0,1,2 and 6, m is comprised in sub-frame allocation to two field of SRS, for example, in first field
Individual subframe comprises SRS; In while second field
Individual subframe comprises SRS.To configuration sequence number 3,4 and 5, m subframe that comprises SRS is positioned at first field.To LTE TDD, because comprise 6 sub-frame of uplink at most in a radio frames, promptly the maximum occurrences scope of m is 0～6, so the bit number of indication mostly is 3 bits most.Specifically, can dispose the subframe of the transmitting SRS except that UpPTS with p bit, the value of p is more than or equal to 0 and smaller or equal to 3.
Another kind method is only to send the number of sub-frames that a parameter m is indicated the transmitting SRS except that UpPTS in every n radio frames, and this m sub-frame of uplink that comprises SRS is distributed in n the radio frames.For example, m sub-frame of uplink that comprises SRS is distributed in each radio frames and the field as far as possible uniformly.Here can not indicate the number of the sub-frame of uplink of all possible SRS of comprising in n the radio frames, and an only indication part comprises the value of the sub-frame of uplink number of SRS.
The symbol of predefine UpPTS can be used for SRS, can be offset the method for s then with sub-district SRS cycle P+ sub-district SRS, indicate the subframe of the transmitting SRS in normal sub-frames, promptly there is a sub-frame of uplink to be used for transmitting SRS every time P, and first SRS subframe is with respect to being s with reference to skew regularly, with reference to regularly being first interior subframe of cycle P time period.With LTE TDD system is example, and to configuration sequence number 0,1,2 and 6, the possible value in sub-district SRS cycle is 5,10,20,40,80,160 and 320ms; To configuration sequence number 3,4 and 5, the possible value in sub-district SRS cycle is 10,20,40,80,160 and 320ms.Support other periodic quantity if desired, promptly the 5ms of 1ms, 2ms and configuration sequence number 3,4 and 5 then needs these periodic quantities are redefined.For example, the 1ms cycle can be defined as the symbol of all UpPTS and sub-frame of uplink can transmitting SRS; The 2ms cycle can be defined as and have 2 positions can transmitting SRS in each field; Configuration sequence number 3,4 and 5 5ms can be defined as has 2 positions can transmitting SRS in each frame.In order to reduce signaling consumption, can limit the maximum that can join the sub-district SRS cycle, for example can to join the maximum in sub-district SRS cycle be 40ms in restriction.To each sub-district SRS cycle P, the sum of the sub-frame of uplink in the P that clocks is F
PThen a kind of method is all F of definition sub-district SRS cycle P
PIndividual sub-district SRS skew can be disposed.In order to reduce signaling consumption, another kind of method is to a sub-district SRS cycle P, does not need to indicate all F
PIndividual possible sub-district SRS deviant, promptly to each possibility sub-district SRS periodic quantity P, the number of the sub-district SRS skew that restriction can be indicated is
For example,
Equal 3 or 1 or the like.Thereby needing the sum of the possibility of indicating in broadcast channel is the sum of the available offset values of each sub-district SRS cycle P.
When not considering that disposing the sequence number difference designs signaling, can be with under all situations, all subframes of 10ms are used for the distribution condition of SRS transmission and indicate.When considering configuration sequence number difference, having only the configuration sequence number is that the situation of #6 is the resource distribution of the uplink SRS in the whole 10ms of indication, other configuration sequence numbers #0-#5 is the resource operating position of first field of indication, and second field will according to circumstances obtain same resource distribution (situation of #1-#2) or obtain empty resource distribution (situation of #3-#5).
Still the configuration of the different up-downgoing ratios of LTE TDD in the reference table one, the problem that step 2 will solve is to tell UE that concrete this user of those resources in the resource of step 1 indication can use, and specifically comprise following main points: step 2 is finished by the RRC signaling; Step 2 will be indicated the initial frequency resource of cyclic shift, comb, SRS bandwidth, SRS, the sub-frame of use and the information of SRS transmission cycle to UE.How inventive point of the present invention is the method for life cycle transmission parameter and the concrete sub-frame that uses of indication, to the transmission of other parameters, identical with the method for designing of present LTE FDD.
At present, this parameter of SRS cycle is { 2ms, 5ms, 10ms, 20ms, 40ms, 80ms, 160ms, a numerical value among the 320ms} among the LTE FDD.In LTE FDD, system is after UE sends the signaling in cycle, and UE will find operable sub-frame to transmit according to the indication of the sub-frame parameter of cycle parameter and use.Below, at LTE TDD, according to different SRS transmission cycle parameters, the course of work that classified description is concrete:
Classification one: system transmissions SRS cycle parameter is 2ms
In LTE TDD, when this cycle parameter is 2ms, at the situation of configuration sequence number 0-2 in the form 1, when sub-frame of uplink (the comprising UpPTS) number that distributes SRS in each field of step 1 smaller or equal to 2 the time, all subframes all are used for the SRS transmission, do not need the indication of signaling explicitly; The number of subframes of distributing when up step 1 is greater than 2 the time, and the present invention specifies and select 2 SC-FDMA symbol transmission SRS from the transmitting SRS resource of step 1 configuration.
When this cycle parameter was 2ms, at the situation of configuration sequence number 3-5 in the form 1, in the present invention, a kind of method was to stipulate that all SRS transfer resources of appointment in step 1 all are used for transmitting the SRS of this UE.Such regulation considered, 10ms in the cycle SRS transfer resource in these three kinds of configurations limited, come transmitting SRS thereby maximally utilise the Radio Resource symbol.Another kind method is, consider that TDD does not need too much uplink SRS transmission sub-frame, consider consistent simultaneously with configuration sequence number 0-2, promptly, in step 1, when sub-frame of uplink (the comprising UpPTS) number that distributes SRS in each field smaller or equal to 2 the time, all subframes all are used for the SRS transmission; The number of subframes of distributing when up step 1 is greater than 2 the time, and the present invention specifies and select 2 SC-FDMA symbol transmission SRS from the transmitting SRS resource of step 1 configuration.
When this cycle parameter was 2ms, the situation at configuration sequence number 6 in the form 1 had three kinds of methods to work.Method one: stipulate that the SRS number in two fields is the same with position distribution, thereby it is identical with the principle of configuration sequence number 0-2, when sub-frame of uplink (the comprising UpPTS) number that distributes SRS in each field of step 1 smaller or equal to 2 the time, all subframes all are used for the SRS transmission; The number of subframes of distributing when up step 1 is greater than 2 the time, and the present invention specifies and select 2 SC-FDMA symbol transmission SRS from the transmitting SRS resource of step 1 configuration.Method two: when sub-frame of uplink number that step 1 is distributed in the 10ms radio frames was smaller or equal to 4, all subframes all were used for the SRS transmission; The number of subframes of distributing when up step 1 is greater than 4 the time, and the present invention specifies and select 4 SC-FDMA symbol transmission SRS from the transmitting SRS resource of step 1 configuration.Method three: when sub-frame of uplink number that step 1 is distributed in the 10ms radio frames was smaller or equal to 5, all subframes all were used for the SRS transmission; When number of subframes that up step 1 is distributed in the 10ms radio frames was greater than 5, the present invention specified and select 5 SC-FDMA symbol transmission SRS from the transmitting SRS resource of step 1 configuration.
The system transmissions SRS Radio Resource that distributes from step 1, some UE are carried out in the resource allocation indication, both can from all available resources (by UpPTS with forms at the SC-FDMA symbol that can be used for transmitting SRS that other upstream data subframes that do not comprise UpPTS comprise) any selection SC-FDMA symbol transmission SRS, also can add constraint.
According to system configuration, determine whether to allow two SC-FDMA symbols in the UpPTS can distribute to same UE simultaneously and make and be used for transmitting SRS.Like this, a kind of possible constraint is can only have a SC-FDMA symbol can select to distribute to some UE in the SC-FDMA symbol that comprises of regulation UpPTS at most to make and be used for transmitting SRS.That is, to the 2ms SRS cycle, the position of distributing to the SRS of subscriber equipment be one in UpPTS, simultaneously another is in general descending sub frame; Perhaps, the position of two SRS all is in general descending sub frame.Another kind of may the constraint is two SRS positions are selected in restriction from available SRS position method.The symbol numbers that is used for SRS in the note field is M, if then support all selection modes, needs the number of the selection mode of indication to be
This numerical value may be bigger, thereby indicate the overhead bit of these selection modes bigger.In order to reduce the indication expense, can stipulate to have only
Part in the individual selection mode is available.For example, a kind of possible restriction is that two interior SCFDMA symbols of UpPTS can not be distributed to same subscriber equipment simultaneously; Another kind of possible restriction is to make two SRS that distribute to subscriber equipment continuous, promptly or be two SRS symbols in the UpPTS; Or at the sub-frame of uplink of UpPTS and its back; Or at two continuous sub-frame of uplink.
Another kind of may the constraint is first field and second physical resource symmetrical distribution as far as possible that field SRS takies.Specifically, the subframe of 4 transmitting SRSs that distribute for method one guarantees in the time of distribution to distribute two in first field, distributes two in second field; The subframe of 5 transmitting SRSs that distribute for method two guarantees in the time of distribution to distribute two in first field, in second field, distribute three or distribute in guarantee in first field, to distribute three, in second field, distribute two.
Classification two: system transmissions SRS cycle parameter is 5ms
In LTE TDD, when this cycle parameter was 5ms, at the situation of configuration sequence number 0-2 in the form 1, the present invention specified and select 1 SC-FDMA symbol transmission SRS from the transmitting SRS resource of step 1 configuration.
When this cycle parameter is 5ms, situation at configuration sequence number 3-5 in the form 1, the number of subframes that is used for SRS transmission when configuration in the step 1 is smaller or equal to 2 the time, the subframe of all step 1 configurations all is used for the SRS transmission, the number of subframes that is used for SRS transmission when configuration in the step 1 is greater than 2 the time, and the present invention specifies and select 2 SC-FDMA symbol transmission SRS from the transmitting SRS resource of step 1 configuration.
When this cycle parameter is 5ms, situation at configuration sequence number 6 in the form 1, when configuration is used for SRS transmission in the 10ms radio frames in the step 1 number of subframes is smaller or equal to 2, the subframe of all step 1 configurations is all given tacit consent to can be used for the SRS transmission, when configuration is used for SRS transmission in the 10ms radio frames in the step 1 number of subframes was greater than 2, the present invention specified and select 2 SC-FDMA symbol transmission SRS from the transmitting SRS resource of step 1 configuration.From simplifying the angle of system design, can add following constraint, promptly one of these two SC-FDMA symbol that distribute transmitting SRSs is at first field (5ms), and one at second field (5ms).And the SC-FDMA position of two transmitting SRSs is symmetrically distributed as far as possible, promptly use two sub-frame transmitting SRSs on the symmetric position in the field respectively, such as, in the time of the individual sub-frame transmitting SRS of #1 in using first field or (#2) or (#3), then regulation use respectively the 2nd on the field #6 or a SC-FDMA symbol on (#7) or (#8) individual sub-frame send SRS.In the time of #4 sub-frame transmitting SRS in first field of use, then can stipulate to use a SC-FDMA symbol on the 2nd #8 the sub-frame on the field to send SRS.
Classification three: system transmissions SRS cycle parameter is other cycles except 2ms and 5ms, comprises 10,20,40,80,160 and 320ms
Can design according to the principle identical with LTE FDD.
The base station is in the control signaling of the special-purpose SRS that subscriber equipment sends, and in order to indicate the time location of the SRS symbol of distributing to subscriber equipment, a kind of method is to adopt the method for SRS cycle+subframe indication information.Subscriber equipment at first determines to distribute to first radio frames at its SRS symbol place, this can control the radio frame number at signaling place by calculating according to its special-purpose SRS, for example, first radio frame number at its SRS symbol place equals the radio frame number at its special-purpose SRS control signaling place.Perhaps, first radio frame number at its SRS symbol place is the radio frame number s to special-purpose SRS control signaling place
CtrlThe result who quantizes according to a numerical value Q, promptly
Perhaps
Q can be certain fixed numeric values; Perhaps Q depends on the SRS cycle P of subscriber equipment, for example, and Q=P; Here, Q is the factor of SFN repetition period, and promptly Q is 2 power.Perhaps, first radio frame number at its SRS symbol place is the radio frames s to special-purpose SRS control signaling place
CtrlThe time started of the radio frames after perhaps it quantizes obtains after adding a fixing time delay τ, i.e. s
Ctrl+ τ, perhaps
Perhaps
τ can be predefined or dispose in broadcast channel.Perhaps, first radio frame number by its SRS symbol place of indication of in the special-purpose SRS signaling of subscriber equipment, showing; The a part of information that perhaps in the special-purpose SRS signaling of subscriber equipment, comprises the radio frame number at its SRS symbol place, thereby control the radio frame number at signaling place and the partial information that special-purpose SRS controls the radio frame number at the SRS symbol place in the signaling according to special-purpose SRS, calculate first radio frames at the SRS symbol place of subscriber equipment.Next, the number of remembering the SRS symbol in the radio frames mostly is M most, then to the periodic quantity more than or equal to the periodic quantity of 5ms and configuration sequence number 3,4 and 5 of configuration sequence number 0,1,2 and 6 more than or equal to 10ms, subscriber equipment takies a position in M the SRS symbol, and the signaling bit number is ceil (log
2(M)).To the 2ms cycle, the subframe indication information in the RRC signaling need redefine to indicating the combined indexes of two SRS symbols, and the number by restriction available combination of 2 symbols of selection in M the symbol makes it smaller or equal to ceil (log
2(M)), then subscriber equipment takies 2 SRS symbols and also can use ceil (log
2(M)) individual bit indication.Thereby during the cycle, the bit number of subframe indication information is constant at various SRS, has guaranteed the uniform structure of RRC signaling.Similarly, to configuration sequence number 3,4 and 5ms cycle of 5, the subframe indication information in the RRC signaling need redefine to indicating the combined indexes of two SRS symbols, and restriction selects the number of the available combination of 2 SRS symbols, makes it smaller or equal to ceil (log
2(M)), then subscriber equipment takies 2 SRS symbols and also can use ceil (log
2(M)) individual bit indication.Thereby during the cycle, the bit number of subframe indication information is constant at various SRS, has guaranteed the uniform structure of RRC signaling.
The base station is in the control signaling of the special-purpose SRS that subscriber equipment sends, in order to indicate the time location of the SRS symbol of distributing to subscriber equipment, another kind method is only to indicate the SRS cycle, and the radio frames at the SRS symbol place of subscriber equipment and subframe all are to determine by implicit method.The SRS cycle of the subscriber equipment of note base station configuration is P ms, then has a subframe to distribute to this subscriber equipment every P ms.Because there be P subframe in the cycle P, subscriber equipment need know that in this P subframe which distribute to oneself.Here, can be used for determining that the information of subframe position comprises: the radio frame number s at SRS cycle P, SRS dedicated control signaling place
Ctrl, the cell configuration in cycle P the position and the number N of SRS symbol
P, and customer equipment identification u etc.Equal sub-district SRS during the cycle when the SRS cycle of subscriber equipment, the SRS symbol of subscriber equipment is just on the SRS of all cell configuration symbol.When SRS cycle of subscriber equipment greater than sub-district SRS during the cycle, the method for the index in the implicit available SRS symbol of SRS symbol all in cycle P of determining subscriber equipment can be i
SRS=f (u, s
Ctrl, N
P), i for example
SRS=mod (u, N
P), perhaps i
SRS=mod (u+s
Ctrl, N
P) or the like.Like this, can be from certain reference time position, the implicit SRS symbol of determining, i.e. i
SRSIndividual SRS symbol is distributed to this subscriber equipment, and repeats this distribution according to cycle P.Here, the reference time position can be the radio frames s at SRS dedicated control signaling place
CtrlThe time started position.The reference time position also can be the radio frames s to SRS dedicated control signaling place
CtrlAccording to the result that a numerical value Q quantizes, promptly the SFN of reference time is
Perhaps
Q can be certain fixed numeric values; Perhaps Q depends on the SRS cycle P of subscriber equipment, for example, and Q=P; Here, Q is the factor of SFN repetition period, and promptly Q is 2 power.The reference time position also can be the radio frames s at SRS dedicated control signaling place
CtrlThe time started of the radio frames after perhaps it quantizes obtains after adding a fixing time delay τ, i.e. s
Ctrl+ τ, perhaps
Perhaps
τ can be predefined or dispose in broadcast channel.Perhaps other define method is adopted in the reference time position.This method both can be used for FDD, also can be used for TDD.To the 2ms cycle and the 5ms cycle of TDD system, because might be in 5ms or 10ms, distributing redefining of two SRS symbols.So to the SRS cycle of these two kinds of subscriber equipmenies, its actual cycle is P (5ms or 10ms), and be in cycle P, to distribute two SRS positions.Implicit above method of distributing stands good, and for example at first implies the position of first SRS symbol of determining subscriber equipment, obtains the position of second SRS symbol then.
For top classification one, classification two and classify three, for the situation that no matter disposes any one sequence number of sequence number, both can adopt elongated signaling also can adopt the signaling of fixed length when adopting the physical resource that signaling indication SRS transmission takies in this step.Elongated signaling length is the available physical sub-frame resources that depends in the step 1, and the design of the signaling of fixed length can suppose that all sub-frame of uplink all may distribute to SRS and transmit and use in step 1.It is elongated signaling or fixed length signaling that standard agreement can be selected at last.
Because when the configuration sequence number is different, it no matter is elongated or the design of the signaling of fixed length, the bit number that the signaling that different configuration sequence numbers is designed needs may be identical, also can be in order to pursue uniform format, need the bit number that uses under the longest situation of bit number number under the used situation and adopt as signaling bit.Perhaps, k bit of fixing employing indicated, and the value of k is more than or equal to 0 and less than max. number of bits here.
In the step 3) of invention, UE receives the uplink channel resources information that can be used for the transmitting SRS signal of network configuration and the dispatch of transmitting SRS.
In this step, UE receives the uplink channel resources that can be used for the transmitting SRS signal of network configuration by D-BCH, UE obtains the concrete physical channel resources that this UE transmitting SRS needs by the dispatch of the concrete transmitting SRS of RRC signaling transmission acquisition from dispatch.
In the step 4) of invention, UE sends the SRS signal that generates in advance on the uplink channel resources of network scheduling.In this step, UE generates basic SRS sequence according to the sequence generating method of SRS in advance, simultaneously according to the SRS transmitting scheduling information that in step 3, obtains, information such as transmission bandwidth and the comb of cyclicshift, SRS, specifically obtain the last SRS sequence that sends of UE, after using power factor that the amplitude of transmitted power is weighted change, on the physical resource of dispatch appointment, send the SRS signal.
When two SCFDMA symbols that allow subscriber equipment to take UpPTS simultaneously send SRS, and UE sends the SRS of different transmitting antennas respectively, consider that conversion needs the time between the antenna of subscriber equipment, the transmission timing advance regular hour τ of first the SCFDMA symbol of system in can predefine UpPTS; And second SCFDMA symbol in the UpPTS be according to original transmission timed sending, thereby generation time is that the interval of τ is used for the antenna conversion between two SCFDMA symbols of UpPTS.This time τ helps the rising edge of the different user devices signal on two SCFDMA symbols of UpPTS and the interference between the trailing edge equally.Here the size of τ depends on the hardware realization of subscriber equipment, needs the occurrence of this parameter of definition from standard.This value may be to derive from the requirement of RAN4 to capabilities of user devices.
Device of the present invention (406) is with reference to figure four, and this device is made up of SRS sequence generation module (401), SRS configuration information receiver module (402), SRS schedule information receiver module (403), SRS sequence transmit control device (404) and power factor adjusting module (405).UE for two transmitting antennas, finish the SRS transmission through the SRS sequence that this device produces through an antenna (407 or 408), the selection of transmitting antenna can be that network passes through the configuration of RRC signaling, also can be to be configured in 2 antennas according to system default alternately to send.For the UE of single antenna, SRS directly sends on single antenna.
Embodiment
This part has provided ten embodiment of this invention.Too tediously long for fear of the description that makes this patent, in the following description, omitted the detailed description of function that the public is known or device etc.
First embodiment:
The configuration sequence number is 0 situation in the corresponding form one of present embodiment.
At first, network by D-BCH configuration can transmitting SRS ascending resource comprise UpPTS (606), Sub-frame2 (603), Sub-frame3 (604) and Sub-frame4 (605), wherein, UpPTS forms (609,610) by 2 SC-FDMA symbols.
Secondly, network is 2ms by the cycle of RRC signaling UE transmitting SRS, and network is Sub-frame2 (603) and Sub-frame3 (604) with the sub-frame of uplink resource of RRC signaling UE transmitting SRS simultaneously also.
Then, UE obtains the physical resource information that the SRS transmission in top two steps is used, and the SC-FDMA symbol (608) on (607) and Sub-frame3 on the SC-FDMA symbol on the Sub-frame2 sends the SRS signal.
Second embodiment:
The configuration sequence number is 1 situation in the corresponding form one of present embodiment.
At first, network by D-BCH configuration can transmitting SRS ascending resource comprise UpPTS (506), Sub-frame2 (503) and Sub-frame3 (504) on the Sub-frame1 (502), wherein, UpPTS is made up of a SC-FDMA symbol.
Secondly, network is 2ms by the cycle of RRC signaling UE transmitting SRS, and network is UpPTS and Sub-frame2 on the Sub-frame1 with the sub-frame of uplink resource of RRC signaling signaling UE transmitting SRS simultaneously also.
Then, UE obtains the resource information in top two steps, goes up transmission SRS signal at a SC-FDMA symbol (506) and the SC-FDMA symbol (507) on the Sub-frame1 of UpPTS.
The 3rd embodiment:
The configuration sequence number is 3 situation in the corresponding form one of present embodiment.
At first, network by D-BCH configuration can transmitting SRS ascending resource comprise UpPTS (704), Sub-frame2 (701), Sub-frame3 (702) and Sub-frame4 (703), wherein, UpPTS is made up of a SC-FDMA symbol.
Secondly, network is 2ms by the cycle of RRC signaling UE transmitting SRS, and network is UpPTS and Sub-frame2 with the sub-frame of uplink resource of RRC signaling UE transmitting SRS simultaneously also.
Then, UE obtains the resource information in top two steps, and the SC-FDMA symbol (705) on (704) and Sub-frame2 on the SC-FDMA of the UpPTS symbol is gone up and sent the SRS signal.
The 4th embodiment:
The configuration sequence number is 6 situation in the corresponding form one of present embodiment.
At first, network by D-BCH configuration can transmitting SRS ascending resource comprise UpPTS (806,808), Sub-frame2 (801), Sub-frame3 (802), Sub-frame4 (803), Sub-frame7 (804) and Sub-frame8 (805), wherein, UpPTS respectively is made up of a SC-FDMA symbol.
Secondly, network is 5ms by the cycle of RRC signaling UE transmitting SRS, and network is Sub-frame2 and Sub-frame7 with the sub-frame of uplink resource of signaling UE transmitting SRS simultaneously also.
Then, UE obtains the resource information in top two steps, goes up transmission SRS signal at SC-FDMA symbol (807) on the Sub-frame2 and the SC-FDMA symbol (809) on the Sub-frame7.
The 5th embodiment:
SC-FDMA symbol in the supposing the system predefine UpPTS is used for the SRS transmission, and the number that limits the SRS symbol of the maximum in each field is 4.Promptly when UpPTS comprises a SC-FDMA, having three sub-frame of uplink to be used for transmitting SRS in field at most, need be 0,1,2 and 3 at the probable value of the SRS symbol numbers of broadcast channel indication promptly; When UpPTS comprises two SC-FDMA, in field, there are two sub-frame of uplink to be used for transmitting SRS at most, need be 0,1 and 2 at the probable value of the SRS symbol numbers of broadcast channel indication promptly, these two sub-frame of uplink can be interior preceding two available sub-frame of uplink of field.Like this, in broadcast channel, need indicate the number of sub-frames of transmitting SRS, thereby obtain SRS symbol numbers in each field and the radio frames in conjunction with the symbol numbers of UpPTS with 2 bits.
When the base station sends the SRS of a subscriber equipment of RRC signaling configuration, to the cycle of configuration sequence number 0,1,2 and 65,10,20,40,40,160 and 320ms, because 8 positions that send SRS are arranged at most in each radio frames, so the position of the SRS symbol that need take with 3 bits indication subscriber equipmenies.
To the cycle of configuration sequence number 0,1,2 and 6 2ms, its indication is 2 SRS symbols of user equipment allocation in field.Here, 2 SRS symbols that are limited in each field are continuous on the position, and then because the SRS symbol maximum number in each field is 4, the combination of two then possible SRS symbols has 3, possible combined number in a radio frames is 6, thereby still can indicate with 3 bits.If the symbol numbers of noting the SRS in each field of configuration in the broadcast channel is less than 2, then the 2ms cycle unavailable, all SRS symbols that perhaps are interpreted as in the field are all distributed to this subscriber equipment.
To configuration sequence number 3,4 and 5, to 10,20,40,40,160 and cycle of 320ms, because 4 positions that send SRS are arranged at most in each radio frames, so position of the SRS symbol that can take with 2 bits indication subscriber equipmenies, the bit number unanimity that keeps various configuration sequence numbers if desired also can be used 3 bits.
To 2ms (perhaps 5ms) cycle of configuration sequence number 3,4 and 5, its indication is 2 SRS symbols of user equipment allocation in radio frames.Here, 2 SRS symbols that are limited in the field are continuous on the position, then because the SRS symbol maximum number in each field is 4, the combination of two then possible SRS symbols has 3, so position of the SRS symbol that can take with 2 bits indication subscriber equipmenies, the bit number unanimity that keeps various configuration sequence numbers if desired also can be used 3 bits.If the symbol numbers of noting the SRS in the configuration radio frames in the broadcast channel is less than 2, then 2ms (perhaps 5ms) cycle unavailable, all SRS symbols that perhaps are interpreted as in the radio frames are all distributed to this subscriber equipment.
Then, UE obtains the resource information in top two steps, sends the SRS signal on the corresponding SRS symbol.
Note, when UpPTS comprises two SC-FDMA, in field, there are three sub-frame of uplink to be used for transmitting SRS at most if allow, need be 0,1,2 and 3 promptly, in broadcast channel, still need to indicate the number of sub-frames of transmitting SRS with 2 bits at the probable value of the SRS symbol numbers of broadcast channel indication.But because in each radio frames 10 SRS symbols are arranged at most, so in the special-purpose SRS control signaling of subscriber equipment, need to use 4 bits to indicate the position of the SRS symbol of distributing to subscriber equipment.
The 6th embodiment:
Present embodiment describe of the present invention a kind of in broadcast channel the method for indicating cell SRS character position.Here the available resources of supposing UpPTS do not need the broadcast signaling indication, if promptly the resource of UpPTS is not taken by Random Access Channel, then acquiescence is used for SRS.Do not repeating in the following description.Be the SRS configuration in other sub-frame of uplink except that UpPTS shown in the table 1, need in broadcast channel, use 4 bits to send this information here.Here, 10 numerals of subframe sequence number are represented the configuring condition of each subframe in a radio frames respectively, and 0 representative does not comprise SRS, and SRS has been disposed in 1 representative.
Table 1: the SRS configuration in other sub-frame of uplink except that UpPTS
| The configuration sequence number | System frame number SFN | The subframe sequence number | Describe |
| 0 | Any SFN | 0000000000 | There is not the |
| 1 | 0 SFN surplus the |
0010000000 | The |
| 2 | 1 SFN surplus the |
0010000000 | The |
| 3 | 2 SFN surplus the |
0010000000 | The |
| 4 | 3 SFN surplus the |
0010000000 | The |
| 5 | Even number SFN | 0010000000 | The |
| 6 | Even number SFN | 0000000100 | The |
| 7 | Odd number SFN | 0010000000 | The |
| 8 | Odd number SFN | 0000000100 | The |
| 9 | Any SFN | 0010000000 | The |
| 10 | Any SFN | 0000000100 | The 10ms cycle |
| 11 | Any SFN | 0010000100 | The 5ms cycle |
| 12 | Any SFN | 0011000100 | |
| 13 | Any SFN | 0011000110 | |
| 14 | Any SFN | 0011100110 | |
| 15 | Any SFN | 0011100111 | |
Note, mainly proposed the configuring condition of SRS in 16 here, not that corresponding concrete configuration of limitation arrangement sequence number.According to system design, can not define all 16 above-mentioned configuring conditions, and only dispose one of them subclass, this subclass is still within protection scope of the present invention.For example, a kind of method of selecting subclass is the configuration sequence number 0,5,9,11,12,13,14 and 15 in the employing table 1, thereby only needs 3 bits to indicate in broadcast channel.
Table 2 is the SRS configurations in another possible other sub-frame of uplink except that UpPTS.
Table 2: the SRS configuration in other sub-frame of uplink except that UpPTS
| The configuration sequence number | System frame number SFN | The subframe sequence number | Describe |
| 0 | Any SFN | 0000000000 | There is not the |
| 1 | 0 SFN surplus the |
0010000000 | The |
| 2 | 1 SFN surplus the |
0010000000 | The |
| 3 | 2 SFN surplus the |
0010000000 | The |
| 4 | Even number SFN | 0010000000 | The |
| 5 | Odd number SFN | 0010000000 | The |
| 6 | Even number SFN | 0000001000 or 0001000000 | The |
| 7 | Any SFN | 0010000000 | The |
| 8 | Any SFN | 0000001000 | The |
| 9 | Any SFN | 0001000000 | The |
| 10 | Any SFN | 0010000100 | The 5ms cycle |
| 11 | Any SFN | 0001000010 | The 5ms cycle |
| 12 | Any SFN | 0000100001 | The 5ms cycle |
| 13 | Any SFN | 0011000110 | Redefine the cycle for 2ms |
| 14 | Any SFN | 0001100011 | Redefine the cycle for 2ms |
| 15 | Any SFN | 0011100111 | Redefine the cycle for 1ms |
Note, mainly proposed the configuring condition of SRS in 16 here, not that corresponding concrete configuration of limitation arrangement sequence number.According to system design, can not define all 16 above-mentioned configuring conditions, and only dispose one of them subclass, this subclass is still within protection scope of the present invention.
Keep the signaling bit number of FDD and TDD system consistent if desired, promptly FDD need come indicating cell SRS resource with 16 bits equally, then can use following table 3 configuration.Here, the SRS offset index can equal the index of SRS place subframe in one-period, and perhaps the SRS offset index is by being mapped to the index of SRS place subframe in one-period someway.
The SRS configuration of table 3:FDD
| The configuration sequence number | The sub-district SRS cycle (ms) | The SRS offset index | Describe |
| 0 | Do not have | Do not have | There is not |
| 1 | 40 | 0 | The |
| 2 | 40 | 1 | The |
| 3 | 40 | 2 | The |
| 4 | 20 | 0 | The |
| 5 | 20 | 1 | The |
| 6 | 20 | 2 | The |
| 7 | 10 | 0 | The |
| 8 | 10 | 1 | The |
| 9 | 10 | 2 | The |
| 10 | 5 | 0 | The 5ms cycle |
| 11 | 5 | 1 | The 5ms cycle |
| 12 | 5 | 2 | The 5ms cycle |
| 13 | 2 | 0 | The 2ms cycle |
| 14 | 2 | 1 | The 2ms cycle |
| 15 | 1 | 0 | The 1ms cycle |
The 7th embodiment:
Present embodiment describe of the present invention a kind of in broadcast channel the method for indicating cell SRS character position.Here be example with LTE TDD system, UpPTS may comprise one or two SCFDMA symbols, and when UpPTS comprises a SCFDMA symbol, this symbol is used for SRS; When UpPTS comprises two SCFDMA symbols, these two symbols all are used for SRS, and perhaps the resource except the resource that is used for inserting at random of these two symbols is used for SRS.Like this, can in the broadcast signaling of configuration SRS, indicate the number of the SCFDMA symbol that UpPTS comprises with 1 bit information.
At this moment, still can adopt table 1 among the embodiment six or table 2 or its part to indicate SRS configuring condition in other sub-frame of uplink except that UpPTS, and increase the number of symbols that 1 bit is indicated UpPTS, one or two SCFDMA symbols that are pPTS are used for SRS, thereby indicate complete SRS configuration information.For example, all possible configurations of dial gauge 1 or table two need 4 bits, increase the indication information of the UpPTS number of symbols of a bit, thereby the bit number of the configuration SRS character position in broadcast channel are 5 bits.When only using subclass of table 1 or table 2, for example adopt the configuration sequence number 0,5,9,11,12,13,14 and 15 in the table 1, only need 4 bits in broadcast channel, to indicate the SRS configuration information.
The 8th embodiment:
Present embodiment is described a kind of method of indicating the TDD system configuration in broadcast channel of the present invention, is example with LTE TDD system here, and described method is equally applicable to have other TDD systems of similar configuration.In LTE TDD system, table 4 is the configuring condition of special subframe (DwPTS, GP and UpPTS), and is as shown in table 4, and the number of configuration sequence number is 9, so need 4 bits to indicate this information at broadcast channel.Table 5 is configuring conditions that the ascending-descending subframes of TDD system distributes, and promptly TDD supports 7 kinds of configurations altogether, like this, needs 3 bits to indicate this information at broadcast channel.In sum, when separating the configuration information of dial gauge 4 and table 5, in broadcast channel, need 7 bits altogether.
Table 4: the configuration of special subframe
Table 5: ascending-descending subframes distributes
In order to reduce signaling consumption, can his-and-hers watches 4 and the configuration of table 5 carry out combined coding.Like this, because table 4 comprises 9 configurations, and table 5 comprises 7 configurations, and like this when combined coding, needing the configuration sum of indication is 9 * 7=63, like this as long as 6 bits have just been finished the indication to the configuration information of this table 4 and table 5.The configuration sequence number of note combined coding is k, k=0, and 1,2 ..., 62, the method for two kinds of possible combined codings is described below.A kind of method of possible combined coding is definition
The configuration sequence number that ascending-descending subframes in the correspondence table 5 distributes; And the configuration sequence number of the special subframe in definition mod (k, the 9) correspondence table 4.Perhaps, the method for another kind of possible combined coding is definition
The configuration sequence number of the special subframe in the correspondence table 4; And the configuration sequence number that the ascending-descending subframes in definition mod (k, the 7) correspondence table 5 distributes.The method of two kinds of combined codings above the present invention does not limit and uses, thus but can other coding methods reach purpose with the configuration information of 6 bit transfer tables 4 and table 5.
The 9th embodiment:
Present embodiment is described two examples of the present invention when SRS cycle maximum in sub-district is 10ms.If the resource of hypothesis UpPTS is not taken by Random Access Channel here, then acquiescence is used for SRS.In table 6, T
SFCBe the sub-district SRS cycle, Δ
SFCIt is sub-district SRS symbol offset.Here, row Δ
SFCEach numerical value be the subframe sequence number, promptly corresponding subframe 0～subframe 9.The subframe numbers of the UpPTS correspondence in first field is that the subframe numbers of the UpPTS correspondence in 1, the second field is 6.As shown in table 6, to configuration sequence number 0～13, UpPTS is defaulted as SRS.Configuration sequence number 14 is used to indicate current area not dispose SRS.In the TDD system, it not necessarily.Because need only only transmitting SRS in UpPTS of base station configuration, for example disposed SRS configuration sequence number 0, then the base station can not send special-purpose SRS configuration signal to Any user, thereby does not have any SRS transmission.Any harmful effect can not arranged to the uplink of system like this, because the base station does not dispose the SRS symbol in general sub-frame of uplink.So configuration sequence number 14 can keep, and also can remove.In addition, the present invention does not limit whole or a part of configurations of adopting in the configuration sequence number 0～13.
The SRS configuration of table 6:TDD
| The configuration sequence number | T SFC | Δ SFC |
| 0 | 5 | {1} |
| 1 | 5 | {1，2} |
| 2 | 5 | {1，3} |
| 3 | 5 | {1，4} |
| 4 | 5 | {1，2，3} |
| 5 | 5 | {1，2，4} |
| 6 | 5 | {1，3，4} |
| 7 | 5 | {1，2，3，4} |
| 8 | 10 | {1，2，6} |
| 9 | 10 | {1，3，6} |
| 10 | 10 | {1，4，6} |
| 11 | 10 | {1，6，7} |
| 12 | 10 | {1，6，8} |
| 13 | 10 | {1，6，9} |
| 14 | Do not dispose SRS | N/A |
Table 7 is another kind of possible collocation methods, here dispose sequence number 11～16th, corresponding asymmetrical SRS configuration in 10ms, at present in the table 7 number of configuration sequence number greater than 16, so need from table 7, select maximum 16, thereby the bit number that guarantees needs is 4 bits.For example, can keep configuration sequence number 0～10, and from configuration sequence number 11～16 and configuration sequence number 17, select 5 at most, thereby total number is smaller or equal to 16.For example, can select to dispose sequence number 11～13 and configuration sequence number 17, thereby constitute one 15 form with configuration sequence number 0～10, total bit number is 4 bits.
The SRS configuration of table 7:TDD
| The configuration sequence number | T SFC | Δ SFC |
| 0 | 5 | {1} |
| 1 | 5 | {1，2} |
| 2 | 5 | {1，3} |
| 3 | 5 | {1，4} |
| 4 | 5 | {1，2，3} |
| 5 | 5 | {1，2，4} |
| 6 | 5 | {1，3，4} |
| 7 | 5 | {1，2，3，4} |
| 8 | 10 | {1，2，6} |
| 9 | 10 | {1，3，6} |
| 10 | 10 | {1，4，6} |
| 11 | 10 | {1，2，6，8} |
| 12 | 10 | {1，3，6，9} |
| 13 | 10 | {1，4，6，7} |
| 14 | 10 | {1，2，6，9} |
| 15 | 10 | {1，3，6，7} |
| 16 17 | 10 do not dispose SRS | {1，4，6，8} N/A |
The tenth embodiment:
Present embodiment is described the other example of the present invention when SRS cycle maximum in sub-district is 10ms.Here, mainly be to the 10ms cycle, only increased in the UpPTS of field of each frame and disposed SRS, dispose SRS with only having increased in the UpPTS of a normal sub-frames of each frame and a field, thereby neighbor cell can be in the UpPTS of different timing transmitting SRS, avoid the SRS phase mutual interference in the UpPTS.Here, the general subframe that is used for SRS can be positioned at identical field or different fields with the UpPTS that is used for SRS.In fact, situation to configuration SRS in the UpPTS of a normal sub-frames of each frame and a field, and in the UpPTS of a normal sub-frames of each frame and two fields the situation of configuration SRS, present embodiment is only listed several available collocation methods, in fact, during sequence number, can indicate more configuring condition as remaining with configuration.
In the option one of table 8, kept the configuration sequence number 0～13 of table 6, increased by two configuration sequence numbers, wherein, configuration sequence number 14 is only to dispose SRS in the UpPTS of first field of each frame; Configuration sequence number 15 is only to dispose SRS in the UpPTS of second field of each frame.
In the option 2 of table 8, kept the configuration sequence number 0～10 of table 6, and increased the configuration sequence number 14 and 15 of table 8 option one.
In the option 3 of table 8, kept the configuration sequence number 0～7 of table 6, and revised configuration sequence number 8～10.Configuration sequence number 8～10th has a general subframe transmitting SRS in a frame, simultaneously only at the UpPTS transmitting SRS of a field of a frame.The general subframe that is used for SRS can be positioned at identical field or different fields with the UpPTS that is used for SRS.Table 8 option 3 is to suppose that they are positioned at identical field.
In the option 4 of table 8, be the configuration sequence number 14 and 15 that on the basis of table 8 option 3, has increased table 8 option one.
The option 5 of table 8 is the results that combine table 8 option 2 and table 8 option 4.
The SRS configuration of table 8:TDD
Although below show the present invention in conjunction with the preferred embodiments of the present invention, one skilled in the art will appreciate that under the situation that does not break away from the spirit and scope of the present invention, can carry out various modifications, replacement and change to the present invention.Therefore, the present invention should not limited by the foregoing description, and should be limited by claims and equivalent thereof.
Claims (13)
1. the sending method of a uplink detection reference signal SRS comprises step:
A) obtain to can be used for to transmit the cycle parameter of uplink channel resources of detection reference signal SRS and the position of SC-FDMA symbol;
B) if described cycle parameter is 2ms or is 5ms that UE sends the SRS signal that generates in advance with the actual cycle that obtains.
2. method according to claim 1 is characterized in that in step a), and the UpPTS acquiescence is used for transmitting SRS, and disposes the situation of SRS in broadcast channel in the general sub-frame of uplink of indication.
3. method according to claim 2 is characterized in that, to the 5ms sub-district SRS cycle, has only UpPTS to be used for SRS in each frame.
4. method according to claim 2 is characterized in that, to the 5ms sub-district SRS cycle, indicates in the general subframe of each field to comprise the SRS symbol.
5. method according to claim 2 is characterized in that, to the 5ms sub-district SRS cycle, indicates two general subframes of each field to comprise the SRS symbol.
6. method according to claim 2 is characterized in that, to the 5ms sub-district SRS cycle, indicates 3 general subframes of each field to comprise the SRS symbol.
7. method according to claim 2 is characterized in that, to the 10ms sub-district SRS cycle, indicates a general subframe of each frame to comprise the SRS symbol.
8. method according to claim 2 is characterized in that, to the 10ms sub-district SRS cycle, indicate two general subframes of each frame to comprise the SRS symbol, and these two general subframe positions in field is different.
9. method according to claim 1 is characterized in that in step a), the situation of configuration SRS in indication UpPTS and the general sub-frame of uplink in broadcast channel.
10. method according to claim 9 is characterized in that, to the 10ms sub-district SRS cycle, indicates a UpPTS of each frame to be used for transmitting SRS.
11. method according to claim 9 is characterized in that, to the 10ms sub-district SRS cycle, and configuration SRS in the UpPTS of a field of each frame.
12. method according to claim 9 is characterized in that, to the 10ms sub-district SRS cycle, indicates a normal sub-frames of each frame and the interior configuration of the UpPTS SRS of a field.
13. a LTE TDD UE sends the device (406) of SRS, comprising:
Module (401) is used to produce the SRS sequence;
Module (402) is used to receive the SRS configuration information;
Module (403) is used to receive the SRS transmitting scheduling information;
Controller (404) is used to send the SRS sequence;
Module (405) is used to adjust power factor.
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Also Published As
| Publication number | Publication date |
|---|---|
| CN103647626A (en) | 2014-03-19 |
| CN101547022B (en) | 2014-03-19 |
| CN101677458A (en) | 2010-03-24 |
| CN103647626B (en) | 2017-01-18 |
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