CN103647626A - Method and device for sending SRS in LTE TDD system - Google Patents

Method and device for sending SRS in LTE TDD system Download PDF

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CN103647626A
CN103647626A CN201310454399.6A CN201310454399A CN103647626A CN 103647626 A CN103647626 A CN 103647626A CN 201310454399 A CN201310454399 A CN 201310454399A CN 103647626 A CN103647626 A CN 103647626A
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srs
frame
cycle
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uplink
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CN103647626B (en
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李迎阳
李小强
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Beijing Samsung Telecommunications Technology Research Co Ltd
Samsung Electronics Co Ltd
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Beijing Samsung Telecommunications Technology Research Co Ltd
Samsung Electronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver

Abstract

The invention discloses a method and a device for sending SRS in an LTE TDD system. The method comprises following steps: a period parameter of uplink channel resources which can be used to transmit a detection reference signal SRS and the position of a SC-FDMA symbol are acquired; and if the period parameter is 2ms or 5ms, a UE is used to send the SRS signal which is generated in advance with the acquired actual cycle period. According to the invention, the effect that the SRS signals are sent by a LTE FDD system periodically can be realized. Meanwhile, compared with the LTE FDD system, the downlink signaling overhead of the system does not increased, the SRS transmission frequency the number can be ensured, and the purpose of the monitoring of the system on uplink wireless channels can be realized.

Description

In LTE TDD system, send the method and apparatus of SRS
The application is in the application for a patent for invention that on May 9th, 2009 submits to " send the method and apparatus of SRS in LTE TDD system " the 200810099452.4th divide an application.
Technical field
The present invention relates to communication system, particularly relate to the method and apparatus that sends SRS (SoundingReference Signal) in communication system.
Background technology
3GPP (The3 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 from traditional C DMA (the Code Division Multiple Access) OFDM that technology is different (0rthogonal Frequency Division Multiplexing), at down link, adopt OFDMA mode, in up link, adopt SC-FDMA (Single Carrier Frequency Division Multiple Access).This new standard technique can effectively be resisted Multipath Transmission, has adopted frequency domain equalization operation to reduce the complexity of traditional time domain equalization, is more suitable for being applied to broadband high-speed transfer of data.
LTE standard technique can be divided into TDD (Time Division Duplex) and FDD (Frequency Division Duplex) two classes from air interface, LTE system is supported bandwidth varying, the typical bandwidth of supporting comprises 1.4,3,5,10,15 and 20MHz, can meet the demand of different scenes.
The physical layer frame structure of LTE FDD system is as shown in figure mono-: the length of radio frames (101:Radio Frame) is 10ms, by 10 wireless sub-frames, (102 is subframes to each radio frames: Radio Sub-frame) form, the duration of each wireless sub-frame is 1ms, each wireless sub-frame is comprised 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 figure bis-: the length of radio frames (201) is 10ms, each radio frames is comprised of 10 wireless sub-frames (204 is wireless sub-frames), the duration of each wireless sub-frame is 1ms, 5 continuous wireless sub-frames form a field (202), and the duration of field is 5ms.Different from LTE FDD system is, the 1st wireless sub-frame (211) in LTE TDD radio frames and the 6th wireless sub-frame (212) are 2 special subframes, the duration of special subframe is 1ms, by 3 special time slots, formed, these 3 special time slots are defined as respectively DwPTS (205 or 208), GP (206 or 209) and UpPTS (207 or 210).Wherein, the time span of DwPTS time slot, GP time slot and UpPTS time slot is variable, and concrete numerical value is by system configuration, the constant 1ms that equals of total time length.Other 8 subframes except 2 special subframes are comprised of 2 time slots (203 is time slots) respectively, and the time span of each time slot is 0.5ms.According to current 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.Take in the LTE tdd frame structure that 10ms is the change-over period, the structure not identical (304,305) of the field that two time spans that form a 10ms cycle whole frame (308) are 5ms.As required, subframe 6 (307) can be configured as the subframe that the time span of transmitting downlink data is 1ms, and subframe 6 (307) also can be configured as with subframe 1 (306) the special subframe that the time span of same structure is 1ms.The LTE TDD system with the different switching cycle (5ms cycle or 10ms cycle) can become different up-downgoing allocation proportions by network configuration.
At two kinds, be respectively to take in the LTE TDD structure that 5ms and 10ms be the cycle, UpPTS is comprised of 1 or 2 SC-FDMA symbols, and concrete numerical value is by system configuration.When UpPTS consists of 2 SC-FDMA symbols, UpPTS is used for transmitting short Random Access Channel (Short RACH) or SRS (Sounding Reference Signal: monitor reference signal) signal or transmits Short RACH channel and SRS signal simultaneously; When UpPTS consists of 1 SC-FDMA symbol, UpPTS is used for transmitting uplink SRS signal.The uplink channel resources that can be used for doing uplink in LTE TDD system comprises UpPTS channel (being comprised of 1 or 2 SC-FDMA symbols) and upstream data subframe, and user selects suitable ascending resource transmission uplink information according to system configuration and scheduling.
In LTE system, according to network scheduling, UE (User Equipment: user terminal) send SRS signal to eNodeB (base station in evolved NodeB:LTE system).The Main Function of SRS signal has: eNodeB is by detecting SRS signal, estimation on the channel of transmitting SRS UE to the channel quality in eNodeB link, thereby carry out frequency selectivity data dispatch, eNodeB does and regularly follows the tracks of and complete close-loop power control UE.
According to current 3GPP (3GPP:The3 rdgeneration Partnership Project, third generation partnership project, the International Standards Organization that is engaged in mobile communication standard) the standardized progress of LTE FDD: (1) SRS is in given subframe transmission, and SRS transmission is by the some or all of temporal frequency resource in the SC-OFDM symbol that uses subframe to start or finish.In transmission subframe, except the symbol starting or finish may be used as SRS transmission, other SC-FDMA symbol is not used in SRS transmission.(2) when the UpPTS being comprised of 2 SC-FDMA symbols is used for transmitting SRS, may 2 SC-FDMA symbols can be used for transmitting SRS signal, also may only have a SC-FDMA symbol for transmitting SRS signal, content of the present invention does not limit specifically has in UpPTS 1 or 2 SC-FDMA symbols for transmitting SRS signal, when standard UpPTS has 1 SC-FDMA symbol for transmitting SRS signal, it is that first or last SC-FDMA symbol transmit for SRS that the present invention does not limit.
According to the standardized progress of current 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, the informational needs of some subframe of transmitting SRS is broadcasted in D-BCH.
(2) eNodeB, by the information of RRC (control of RRC:Radio Resource Control Radio Resource) signaling UE, comprising:
The transmission cycle of-SRS: from { a numerical value of selecting in 2,5,10,20,40,80,160,320}ms;
The cyclic shift of-SRS (CS:Cyclic Shift: cyclic shift) value;
No. comb 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 is divided into 2 groups by the principle according to being spaced apart a subcarrier, each group is referred to as a comb, is designated as comb0 or comb1;
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 current research on standard, the SRS method for designing of LTE TDD and the problem running into are as follows:
Suppose that in LTE TDD system, the SRS transmission principle in SRS Transmission Design and LTE FDD system is consistent,, under the prerequisite of LTE FDD appropriate design SRS, can protect SRS transmission in positive LTE TDD system and meet the needs that system is carried out wireless channel monitoring.According to the SRS transmission of this thinking design LTETDD system, in research, find: in LTE FDD system, uplink is used different frequency ranges from downlink transfer, guaranteed to see and can carry out continuously in time uplink from system perspective, pass through base station scheduling, in the uplink frame of 10ms, dispatch sub-frame resources according to the SRS cycle of appointment transmitting SRS regularly, because there are maximum 10 possible subframes in the radio frames of 10ms, do uplink, can therefrom find the cycle is Radio Resource (frequency resource in 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, at transfer point, in the cycle, all both comprised that uplink subframe also comprised downlink transfer subframe, the cycle that just may can not find so available 2ms or 5ms in the configuration of seven kinds of standard supports of all LTE TDD is done SRS transmission.
According to the problem running in upper surface analysis LTE TDD SRS Transmission Design, the method of using at present the cycle parameter of 2ms and 5ms that SRS transmission cycle is set in LTEFDD system needs to redesign in LTETDD system, otherwise the UE in LTE TDD system receives the SRS week after date of system call, possibly cannot 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, can make the UE of LTE TDD system according to the SRS dispatch of network base station transmission, find suitable radio resource transfer SRS, thereby uplink wireless channel monitoring can be done according to SRS signal in the base station of LTE TDD.The present invention is with reference to take 2ms and 5ms in LTE FDD system and dispatching UE as cycle parameter and send SRS signal, how in conjunction with the design feature of LTE TDD, newly proposed LTE TDD system utilizes 2ms and 5ms cycle parameter to obtain the method and apparatus that suitable wireless time frequency resource is carried out transmitting SRS, the frequent degree of LTE TDD transmitting SRS signal and quantity and LTE FDD are approached, thereby meet the requirement to SRS transmission performance in LTE TDD communication system.
Summary of the invention
The object of this invention is to provide a kind of method and apparatus for LTE 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 the cycle parameter of uplink channel resources and the position of SC-FDMA symbol that can be used for transmitting detection reference signal SRS;
B) if described cycle parameter is 2ms or for 5ms, UE sends with the actual cycle obtaining the SRS signal generating in advance.
According to invention on the other hand, a kind of LTE TDD UE sends the device (406) of SRS, lower part, consists of:
Module 401, for generation of SRS sequence;
Module 402, for receiving SRS configuration information;
Module 403, for receiving SRS transmitting scheduling information;
Controller 404, for sending SRS sequence;
Module 405, for the Modulating Power factor.
Accompanying drawing explanation
Fig. 1 is the frame structure schematic diagram of LTE FDD;
Fig. 2 is the frame structure schematic diagram of LTE TDD;
Fig. 3 be take the LTE TDD structural representation that 10ms is the transfer point cycle;
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 step below:
1) network configuration can be used for the uplink channel resources of transmitting SRS signal;
2) base station sends the dispatch of transmitting SRS to UE, and scheduling UE selects the uplink channel resources transmitting SRS signal of appointment in the uplink channel resources that can be used for transmitting SRS signal of network configuration;
3) UE receives the uplink channel resources information that can be used for transmitting SRS signal of network configuration and the dispatch of transmitting SRS;
4) UE sends the SRS signal generating in advance on the uplink channel resources of network scheduling.
In invention step 1) in, network can be by can be used for the uplink channel resources of transmitting SRS signal in D-BCH configuration-system, by D-BCH channel be configured in LTE TDD system can transmitting SRS the number of sub-frame of uplink and the position of concrete subframe, this both can realize by the method for bit mapping figure (Bit Map), also can be by exhaustive all resource situation, such as be n, then get to take 2 logarithms that are the end configure (adopt bit number as: ceil (log2 (n))).
When configuring the physical resource of transmitting SRS with D-BCH, can be in two sub-sections.Part one: the situation of configuration UpPTS transmitting SRS
No matter 5ms or the transfer point cycle of 10ms in LTE TDD system, form the number of SC-FDMA symbol of UpPTS or 1 or 2, and concrete numerical value can be configured by system in P-BCH or D-BCH.Situation for the 10ms transfer point cycle, the present invention's regulation, the SC-FDMA number that forms the middle UpPTS of subframe #1 (306) and subframe #6 (307) is identical, all equals 1 or all equal 2, can under the prerequisite that does not affect systematic function, simplify system like this.
When UpPTS is comprised of a SC-FDMA symbol, directly defines it and transmit for SRS; When UpPTS is comprised of two SC-FDMA symbols, there is several different methods definition below wherein for the physical resource of SRS transmission, comprise
Submethod 1: define first SC-FDMA symbol and transmit for SRS
Submethod 2: define second SC-FDMA symbol for SRS transmission
Submethod 3: define two SC-FDMA symbols and all transmit for SRS
Submethod 1,2 or 3 can be selected a kind of, by static system or semi-statically configuration.
Part two: the situation of configuration UpPTS and other the upstream data subframe transmitting SRSs of employing except UpPTS
In LTE TDD, (ratio of sub-frame of uplink and descending sub frame quantity in the radio frames of a 10ms) different and different according to system configuration because the proportioning of up-downgoing, form one has represented all seven kinds of proportioning situations that LTETDD standard is supported.
In form one, the number of concrete sub-frame of uplink is by 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) may have 3,2 or 1; For the configuration in 10ms transfer point cycle, in each frame, upstream data subframe may have 3, and 2,1 or 5.So, these subframes can be used for transmitting SRS signal in whole or in part.For different configuration sequence numbers, specifically by signaling, indicate for the number of sub-frames of transmitting SRS and concrete subframe position and be exemplified below,
Form one: LTE TDD ascending-descending subframes distributes possible configuration
Figure BDA0000389805580000071
The first UpPTS configuring condition: supposition UpPTS is comprised of a SC-FDMA symbol, and suppose whether the SCFDMA symbol in UpPTS needs signaling indication for SRS.
For configuration sequence number 0, each 5ms has 4 upward position transmitting SRSs in the cycle, considers and may have 0,1,2,3 or 4 upward position to be used for transmitting SRS, and so possible position grouping just has:
Figure BDA0000389805580000072
kind, with 4 bit signallings, can complete so the indication of SRS transmission subframe, numerical value 0 just represents that data 15 just represent that UpPTS and subframe #2, #3 and #4 transmit for sub-frame of uplink not for the subframe of SRS transmission.In the case, also can indicate by the method for bit mapping, such as: 0000 represents that 0110 just represents that subframe #2 and subframe #3 transmit for sub-frame of uplink not for the subframe of SRS transmission.
The rest may be inferred so, can obtain supposing that UpPTS is comprised of in situation a SC-FDMA symbol, and the in the situation that of configuration sequence number 1 and 2, the indication bit number needing is respectively 3 and 2 bits.
In standardized protocol specification, the situation that both can configure sequence number for difference represents the subframe for uplink SRS with the bit of different numbers, such as the situation that is 0,1 and 2 for configuration sequence number is carried out indexed resource with 4,3 and 2 bits respectively; Also can be in order to simplify and integrated system form, unification represents sub-frame of uplink number and the position for uplink SRS transmission with the longest bit number, such as unified physics number of subframes and position of using 4 bits to indicate SRS transmission concrete under the 5ms transfer point cycle to take.Or the bit number of fixing indication SRS position is k, the value of k is more than or equal to 0 and be less than 4.Here, can be with the symbol in a bit indication UpPTS whether for SRS; When the sub-frame of uplink number in field is greater than k-1, a predefine k-1 wherein subframe can transmitting SRS, for example, and a front k-1 sub-frame of uplink, and with remaining k-1 bit indication.
Adopt identical principle, the configuration sequence number 3,4 and 5 to the 10ms change-over period, carrys out indexed resource with 4,3 and 2 bits respectively; Also can be in order to simplify and integrated system form, unification represents sub-frame of uplink number and the position for uplink SRS transmission with the longest bit number, such as unified 4 bits that use are indicated.Or the bit number of fixing indication SRS position is k, the value of k is more than or equal to 0 and be less than 4.Here, can be with the symbol in a bit indication UpPTS whether for SRS; When the sub-frame of uplink number in field is greater than k-1, a predefine k-1 wherein subframe can transmitting SRS, for example, and a front 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 two SRS numbers in field are the same with position distribution, and configure according to the fewer field of sub-frame of uplink number, adopt 3 bit indications; Or, can stipulate that two SRS numbers in field are the same with position distribution, and the field many according to sub-frame of uplink number configures, adopt 4 bits, at this moment, if distributed subframe 4 for SRS, and corresponding subframe (being subframe 9) in the fewer field of sub-frame of uplink number is not sub-frame of uplink, automatically thinks a few SRS position in the fewer field of sub-frame of uplink number.Or the bit number of fixing indication SRS position is k, the value of k is more than or equal to 0 and be less than 3.Here, can be with the symbol in a bit indication UpPTS whether for SRS; When the sub-frame of uplink number in field is greater than k-1, a predefine k-1 wherein subframe can transmitting SRS, for example, and a front k-1 sub-frame of uplink, and with remaining k-1 bit indication.
In order further to simplify the form of system specifications, can not consider 5ms or 10ms the transfer point cycle difference and the signaling bit of unified needs is set to 4 bits, or the signaling bit of unified needs is set to k bit, the value of k is more than or equal to 0 and be less than 4.To the 5ms change-over period, the position of the SRS of this information indication in each field; Configuration 3,4 and 5 to the 10ms change-over period, the position of this information indication SRS of (in the field that is comprising line time in other words conj.or perhaps) in each radio frames; Configuration 6 to the 10ms change-over period, the position of the SRS of this information indication in each field.
To the sub-frame of uplink number difference 1 in 6, two fields of configuration 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.
In order to simplify the form of system specifications, the signaling bit of the frame format unification needs of all configuration sequence numbers is set to 8 bits.Thereby 8 bits are indicated respectively the SRS distribution condition of corresponding sub-frame of uplink.Here, to the 5ms change-over period, front 4 bits and rear 4 bits are indicated respectively a SRS position in field; To the 10ms change-over period, front 4 bits are used to indicate the position of the SRS in first field; Configuration 6 to the 10ms change-over period, front 7 bits are used to indicate the position of SRS.Or the signaling bit of unified needs is set to 2k bit, to the 5ms change-over period, a front k bit and a rear k bit are indicated respectively a SRS position in field; To the 10ms change-over period, a front k bit is used to indicate the position of the SRS in first field; Configuration 6 to the 10ms change-over period, a front k bit and a rear k bit are indicated respectively a SRS position in field.Consider that FDD may adopt 10 bit bit mappings to indicate the position of configuration SRS, TDD is multiplexing this form likely, the signaling bit of unifying needs is set to 10 bits, and UpPTS corresponds to subframe 1 and/or subframe 6, thereby 10 bits are indicated respectively the SRS distribution condition of corresponding subframe.
The second UpPTS configuring condition: supposition UpPTS is comprised of a SC-FDMA symbol, and supposes that the SCFDMA symbol predefine in UpPTS transmits for SRS.
For configuration sequence number 0, each 5ms, in the cycle, except UpPTS, separately has 3 sub-frame of uplink, in these 3 sub-frame of uplink, may have 0,1,2 or 3 subframe to be used for transmitting SRS, and so possible position grouping just has:
Figure BDA0000389805580000091
kind, with 3 bit signallings, can complete so the indication of SRS transmission subframe.In the case, also can indicate by the method for bit mapping, such as: 000 represents that 110 just represent that subframe #2 and subframe #3 transmit for sub-frame of uplink not for the subframe of SRS transmission.
The rest may be inferred so, can obtain supposing that UpPTS is comprised of in situation a SC-FDMA symbol, and the in the situation that of configuration sequence number 1 and 2, the indication bit number needing is respectively 2 and 1 bit.
In standardized protocol specification, the situation that both can configure sequence number for difference represents the subframe for uplink SRS with the bit of different numbers, such as the situation that is 0,1 and 2 for configuration sequence number is carried out indexed resource with 3,2 and 1 bit respectively; Also can be in order to simplify and integrated system form, unification represents sub-frame of uplink number and the position for uplink SRS transmission with the longest bit number, such as unified physics number of subframes and position of using 3 bits to indicate SRS transmission concrete under the 5ms transfer point cycle to take.Or the bit number of fixing indication SRS position is k, the value of k is more than or equal to 0 and be less than 3.Here, when the sub-frame of uplink number in field is greater than k, a predefine k wherein subframe can transmitting SRS, for example, and a front k sub-frame of uplink.
Adopt identical principle, the configuration sequence number 3,4 and 5 to the 10ms change-over period, carrys out indexed resource with 3,2 and 1 bit respectively; Also can be in order to simplify and integrated system form, unification represents sub-frame of uplink number and the position for uplink SRS transmission with the longest bit number, such as unified 3 bits that use are indicated.Or the bit number of fixing indication SRS position is k, the value of k is more than or equal to 0 and be less than 3.Here, when the sub-frame of uplink number in field is greater than k, a predefine k wherein subframe can transmitting SRS, for example, and a front 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 two SRS numbers in field are the same with position distribution, and configure according to the fewer field of sub-frame of uplink number, adopt 2 bit indications; Or, can stipulate that two SRS numbers in field are the same with position distribution, and configure according to the many fields of sub-frame of uplink number, adopt 3 bit indications.At this moment, if distributed subframe 4 for SRS, and corresponding subframe (being subframe 9) in the fewer field of sub-frame of uplink number is not sub-frame of uplink, automatically thinks a few SRS position in the fewer field of sub-frame of uplink number.Or the bit number of fixing indication SRS position is k, the value of k is more than or equal to 0 and be less than 2.Here, when the sub-frame of uplink number in field is greater than k, a predefine k wherein subframe can transmitting SRS, for example, and a front k sub-frame of uplink.
In order to simplify the form of system specifications, can not consider 5ms or 10ms the transfer point cycle difference and the signaling bit of unified needs is set to 3 bits, or the signaling bit of unified needs is set to k bit, the value of k is more than or equal to 0 and be less than 3.To the 5ms change-over period, the position of the SRS of this information indication in each field; Configuration 3,4 and 5 to the 10ms change-over period, the position of this information indication SRS of (in the field that is comprising line time in other words conj.or perhaps) in each radio frames; Configuration 6 to the 10ms change-over period, the position of the SRS of this information indication in each field.
To the sub-frame of uplink number difference 1 in 6, two fields of configuration 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.
In order to simplify the form of system specifications, the signaling bit of the frame format unification needs of all configuration sequence numbers is set to 6 bits.Thereby 6 bits are indicated respectively the SRS distribution condition of corresponding sub-frame of uplink.Here, to the 5ms change-over period, the SRS position in the general sub-frame of uplink in front 3 bits and a field of rear 3 bits indication; To the 10ms change-over period, front 3 bits are used to indicate the position of the SRS in the general sub-frame of uplink in first field; Configuration 6 to the 10ms change-over period, front 5 bits are used to indicate the position of SRS.Or the signaling bit of unified needs is set to 2k bit, the value of k is more than or equal to 0 and be less than 3.To the 5ms change-over period, a front k bit and a rear k bit are indicated respectively a SRS position in field; To the 10ms change-over period, a front k bit is used to indicate the position of the SRS in first field; Configuration 6 to the 10ms change-over period, a front k bit and a rear k bit are indicated respectively a SRS position in field.
For UpPTS, by 2 SC-FDMA symbols, formed, and may be used to the situation of transmitting SRS.Corresponding to above-described the first UpPTS configuring condition, suppose whether each the SCFDMA symbol in UpPTS needs signaling indication for SRS, adopt bit mapping method, while indicating the bit number of SRS resource location only to comprise a SCFDMA symbol than UpPTS many 1.Corresponding to above-described the second UpPTS configuring condition, be that one or two SCFDMA symbols in predefine UpPTS are for SRS, thereby do not need one or more SCFDMA symbol in signaling indication UpPTS for SRS, identical while 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, i.e. the bit number of the indication SRS position below unified each configuration sequence number; Also can design respectively the bit number that signaling needs according to the difference of the SC-FDMA number (1 or 2) of the different of configuration sequence number and composition UpPTS.
In superincumbent indicating means, in order to indicate number of subframes and the position of transmitting SRS, can increase some and retrain to save the signaling bit number that needs use.Such as, agreement only have continuous SC-FDMA symbol can be for transmitting SRS (subframe that refers to continuously two SC-FDMA symbol places is continuous subframe in time) etc., 1 or 2 SC-FDMA comprising except UpPTS transmits for SRS according to pre-defined mode, it is to start to distribute according to ascending order from first sub-frame of uplink (subframe 2 or subframe 7) that system also can be arranged SRS resource; Or SRS resource is that last subframe (subframe 4 or subframe 9) from each up transmitting time section starts to distribute 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 of the interior Resource Block for control channel of each sub-frame of uplink may be different.At this moment, transmitting SRS in the fewer sub-frame of uplink of the Resource Block number that can preferentially take at control signal, thus SRS can transmit in wider bandwidth, and this is conducive to utilize the symmetry of TDD channel with SRS, to carry out the scheduling of downlink resource.
Take above-mentioned is example to the second UpPTS configuring condition, and for configuration sequence number 0, each 5ms is in the cycle, except UpPTS, separately there are 3 sub-frame of uplink, in these 3 sub-frame of uplink, may there is 0,1,2 or 3 subframe to be used for transmitting SRS, like this, need 2 bits complete the indication of SRS transmission subframe.That is, 0 represents not the subframe for SRS transmission, and 2 just represent that two continuous subframes (for example, subframe #2 and subframe #3) transmit for SRS.Similarly, in the situation that configuring sequence number 1 and 2, the indication bit number needing is respectively 2 and 1.
Similarly, the configuration sequence number 3,4 and 5 to the 10ms change-over period, carrys out indexed resource with 2,2 and 1 bit respectively; Also can be in order to simplify and integrated system form, unification represents sub-frame of uplink number and the position for uplink SRS transmission with the longest bit number, such as unified 2 bits that use are indicated.Or the bit number of fixing indication SRS position is k, the value of k is more than or equal to 0 and be less than 2.Here, when the sub-frame of uplink number in field is greater than k, a predefine k wherein subframe can transmitting SRS; When the sub-frame of uplink number in field is less than k, the number of subframes of transmitting SRS is limited 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 two SRS numbers in field are the same with position distribution, and configure according to the fewer field of sub-frame of uplink number, adopt 2 bit indications; Or, can stipulate that two SRS numbers in field are the same with position distribution, and configure according to the many fields of sub-frame of uplink number, the bit number at this moment needing remains 2 bits.At this moment, if distributed subframe 4 for SRS, and corresponding subframe (being subframe 9) in the fewer field of sub-frame of uplink number is not sub-frame of uplink, automatically thinks a few SRS position in the fewer field of sub-frame of uplink number.Or the bit number of fixing indication SRS position is k, the value of k is more than or equal to 0 and be less than 2.Here, when the sub-frame of uplink number in field is greater than k, a predefine k wherein subframe can transmitting SRS; When the sub-frame of uplink number in field is less than k, the number of subframes of transmitting SRS is limited to the number of actual sub-frame of uplink.
In standardized protocol specification, the situation that both can configure sequence number for difference represents the subframe for uplink SRS with the bit of different numbers.For example, the situation that is 0,1 and 2 for configuration sequence number is carried out indexed resource with 2,2 and 1 bit respectively; In order to simplify the form of system specifications, can not consider 5ms or 10ms the transfer point cycle difference and the signaling bit of unified needs is set to 2 bits, or the signaling bit of unified needs is set to k bit, the value of k is more than or equal to 0 and be less than 2.To the 5ms change-over period, the position of the SRS of this information indication in each field; Configuration 3,4 and 5 to the 10ms change-over period, the position of this information indication SRS of (in the field that is comprising line time in other words conj.or perhaps) in each radio frames; Configuration 6 to the 10ms change-over period, the position of the SRS of this information indication in each field.
To the sub-frame of uplink number difference 1 in 6, two fields of configuration 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 10ms radio frames, and front 2 bits and rear 2 bits indicate respectively the SRS in first field and second field 2 to distribute.Like this, in order to simplify the form of system specifications, the signaling bit of the frame format unification needs of all configuration sequence numbers is set to 4 bits, thus the SRS configuration in indication 10ms radio frames.Here, to the 5ms change-over period, the SRS position in the general sub-frame of uplink in front 2 bits and a field of rear 2 bits indication; To the 10ms change-over period, front 2 bits are used to indicate the position of the SRS in the general sub-frame of uplink in first field; Configuration 6 to the 10ms change-over period, the SRS position in the general sub-frame of uplink in front 2 bits and a field of rear 2 bits indication.Or the signaling bit of unified needs is set to 2k bit, the value of k is more than or equal to 0 and be less than 2.To the 5ms change-over period, a front k bit and a rear k bit are indicated respectively a SRS position in field; To the 10ms change-over period, a front k bit is used to indicate the position of the SRS in first field; Configuration 6 to the 10ms change-over period, a front k bit and a rear k bit are indicated respectively a SRS position in field.
Method is above each field in a radio frames to be indicated respectively to the number of sub-frames of the transmitting SRS except UpPTS, also can only send the number of sub-frames that a parameter m is indicated the transmitting SRS except UpPTS in a radio frames.To configuration sequence number 0,1,2 and 6, in m sub-frame allocation to two field that comprises SRS, for example, in first field
Figure BDA0000389805580000131
individual subframe comprises SRS; In while second field
Figure BDA0000389805580000132
individual subframe comprises SRS.Configuration sequence number 3,4 and 5, m subframe that comprises SRS are positioned to first field.To LTE TDD, because comprise at most 6 sub-frame of uplink in a radio frames, the maximum occurrences scope of m is 0～6, so the bit number of indication mostly is 3 bits most.Specifically, can configure with p bit the subframe of the transmitting SRS except UpPTS, the value of p is to be more than or equal to 0 and be less than 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 UpPTS in every n radio frames, and this m sub-frame of uplink that comprises SRS is distributed in n radio frames.For example, m sub-frame of uplink that comprises SRS is distributed in each radio frames and field as far as possible uniformly.Here can not indicate the number of the sub-frame of uplink of n all possible SRS of comprising in radio frames, and the value of the sub-frame of uplink number that an only indication part comprises SRS.
The symbol of predefine UpPTS can be for SRS, then can be offset with community SRS cycle P+ community SRS the method for s, indicate the subframe of the transmitting SRS in normal sub-frames, be that per interval P has a sub-frame of uplink for transmitting SRS, and first SRS subframe is with respect to being s with reference to skew regularly, with reference to timing, can be first subframe in the cycle P time period.The LTE TDD system of take is example, and to configuration sequence number 0,1,2 and 6, the possible value in community SRS cycle is 5,10,20,40,80,160 and 320ms; To configuration sequence number 3,4 and 5, the possible value in community SRS cycle is 10,20,40,80,160 and 320ms.If need to support other periodic quantity, the 5ms of 1ms, 2ms and configuration sequence number 3,4 and 5, needs these periodic quantities to redefine.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 in each field, have 2 positions can transmitting SRS; 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 Ke Pei community maximum in SRS cycle, the maximum that for example limits the Ke Pei community SRS cycle is 40ms.To each community SRS cycle P, the sum of the sub-frame of uplink in a P that clocks is F p.A kind of method is all F that define community SRS cycle P pindividual community SRS skew can configure.In order to reduce signaling consumption, another kind of method is Dui Yige community SRS cycle P, does not need to indicate all F pindividual possible community SRS deviant, to each possibility community SRS periodic quantity P, the number of the community SRS skew that restriction can be indicated is F p'.For example, F p' equal 3 or 1 etc.Thereby needing the sum of the possibility of indication in broadcast channel is the sum of the available offset values of each community SRS cycle P.
When not considering that configuring sequence number difference designs signaling, can be by under all situations, all subframes of 10ms are indicated for the distribution condition of SRS transmission.When considering configuration sequence number difference, only having 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 service condition 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).
Step 2 in invention) in, base station sends the dispatch of transmitting SRS to UE, and scheduling UE selects the uplink channel resources transmitting SRS signal of appointment in the uplink channel resources that can be used for transmitting SRS signal of network configuration.
Still the configuration of the different up-downgoing ratios of LTE TDD in 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 comprises main points below: step 2 completes by RRC signaling; Step 2 will indicate cyclic shift, comb, SRS bandwidth, the initial frequency resource of SRS, the information of the sub-frame of use and SRS transmission cycle to UE.How inventive point of the present invention is the method for life cycle transformation parameter and the concrete sub-frame using of indication, and the transmission to other parameters is identical with the method for designing of current LTE FDD.
At present, in LTE FDD, this parameter of SRS cycle is { 2ms, 5ms, 10ms, 20ms, 40ms, 80ms, 160ms, a numerical value in 320ms}.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, for LTE TDD, according to different SRS transmission cycle parameters, the course of work that classified description is concrete:
Classification one: system transmitting SRS cycle parameter is 2ms
In LTE TDD, when this cycle parameter is 2ms, for configuring the situation of sequence number 0-2 in form 1, when distributing the sub-frame of uplink (comprising UpPTS) of SRS in each field of step 1 number be less than or equal to 2, all subframes, all for SRS transmission, do not need the indication of signaling explicitly; When the number of subframes of up step 1 distribution is greater than 2, the present invention specifies from the transmitting SRS resource of step 1 configuration and selects 2 SC-FDMA symbol transmission SRS.
When this cycle parameter is 2ms, for configuring the situation of sequence number 3-5 in form 1, in the present invention, a kind of method be regulation all in step 1 the SRS transfer resource of appointment be all 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, thereby maximally utilise Radio Resource symbol, carry out transmitting SRS.Another kind method is, consider that TDD does not need too much uplink SRS transmission sub-frame, consider consistent with configuration sequence number 0-2 simultaneously,, in step 1, when distributing the sub-frame of uplink (comprising UpPTS) of SRS in each field number is less than or equal to 2, all subframes are all transmitted for SRS; When the number of subframes of up step 1 distribution is greater than 2, the present invention specifies from the transmitting SRS resource of step 1 configuration and selects 2 SC-FDMA symbol transmission SRS.
When this cycle parameter is 2ms, for configuring the situation of sequence number 6 in form 1, there are three kinds of methods to work.Method one: stipulate that the SRS number in two fields is the same with position distribution, thereby identical with the principle of configuration sequence number 0-2, when distributing the sub-frame of uplink (comprising UpPTS) of SRS in each field of step 1 number is less than or equal to 2, all subframes are all transmitted for SRS; When the number of subframes of up step 1 distribution is greater than 2, the present invention specifies from the transmitting SRS resource of step 1 configuration and selects 2 SC-FDMA symbol transmission SRS.Method two: the sub-frame of uplink number distributing in 10ms radio frames when step 1 is less than or equal in 4, and all subframes are all transmitted for SRS; When the number of subframes of up step 1 distribution is greater than 4, the present invention specifies from the transmitting SRS resource of step 1 configuration and selects 4 SC-FDMA symbol transmission SRS.Method three: the sub-frame of uplink number distributing in 10ms radio frames when step 1 is less than or equal in 5, and all subframes are all transmitted for SRS; The number of subframes of distributing in 10ms radio frames when up step 1 is greater than in 5, and the present invention specifies from the transmitting SRS resource of step 1 configuration and selects 5 SC-FDMA symbol transmission SRS.
When some UE being carried out resource distribution indication the system transmitting SRS Radio Resource distributing from step 1, both can from all available resources (being formed with the SC-FDMA symbol that can be used for transmitting SRS comprising in other upstream data subframes that do not comprise UpPTS by UpPTS), select arbitrarily SC-FDMA symbol transmission SRS, also can add constraint.
According to system configuration, determine whether to allow two SC-FDMA symbols in UpPTS can distribute to same UE simultaneously and make for transmitting SRS.Like this, a kind of possible constraint is in the SC-FDMA symbol that comprises of regulation UpPTS, can only have at most a SC-FDMA symbol can select to distribute to some UE to make 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; Or the position of two SRS is all in general descending sub frame.Another kind of may constraint is that the method for two SRS positions is selected in restriction from available SRS position.Symbol numbers for SRS in note field is M, if support all selection modes, needs the number of the selection mode of indication to be
Figure BDA0000389805580000161
this numerical value may be larger, thereby indicate the overhead bit of these selection modes larger.In order to reduce indication expense, can stipulate to only have
Figure BDA0000389805580000162
a part in individual selection mode is available.For example, a kind of possible restriction is that two SCFDMA symbols in UpPTS can not be distributed to same subscriber equipment simultaneously; Or be two SRS symbols in UpPTS another kind of possible restriction is that to make to distribute to two SRS of subscriber equipment continuous; Or at UpPTS and the sub-frame of uplink after it; Or at two continuous sub-frame of uplink.
Another kind of may constraint is that the physical resource that takies of first field and second field SRS is as far as possible symmetrical.Specifically, the subframe of 4 transmitting SRSs that distribute for method one, guarantees in the time of distribution in first field, to distribute two, in second field, distributes two; The subframe of 5 transmitting SRSs that distribute for method two, guarantees in the time of distribution in first field, to distribute two, in second field, distribute three or distribute in guarantee in first field, to distribute three, in second field, distribute two.
Classification two: system transmitting SRS cycle parameter is 5ms
In LTE TDD, when this cycle parameter is 5ms, for configuring the situation of sequence number 0-2 in form 1, the present invention specifies from the transmitting SRS resource of step 1 configuration and selects 1 SC-FDMA symbol transmission SRS.
When this cycle parameter is 5ms, for configuring the situation of sequence number 3-5 in form 1, when the number of subframes that is configured for SRS transmission in step 1 is less than or equal to 2, the subframe of all step 1 configurations is all transmitted for SRS, when the number of subframes that is configured for SRS transmission in step 1 is greater than 2, the present invention specifies from the transmitting SRS resource of step 1 configuration and selects 2 SC-FDMA symbol transmission SRS.
When this cycle parameter is 5ms, for configuring the situation of sequence number 6 in form 1, the number of subframes that is configured for SRS transmission in step 1 in 10ms radio frames is less than or equal in 2, the subframe of all step 1 configurations is all given tacit consent to and can be transmitted for SRS, the number of subframes that is configured for SRS transmission in step 1 in 10ms radio frames is greater than in 2, and the present invention specifies from the transmitting SRS resource of step 1 configuration and selects 2 SC-FDMA symbol transmission SRS.From simplifying the angle of system, can add constraint below, 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 symmetrical as far as possible, use respectively two sub-frame transmitting SRSs in the symmetric position in field, such as, in the time of #1 in using first field or (#2) or (#3) individual sub-frame transmitting SRS, regulation is used respectively the 2nd #6 on field or a SC-FDMA symbol on (#7) or (#8) individual sub-frame to send SRS.In the time of #4 sub-frame transmitting SRS in using first field, can stipulate to use a SC-FDMA symbol transmission SRS on the 2nd #8 sub-frame on field.
Classification three: system transmitting 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.
In the control signal of the special-purpose SRS that base station sends to subscriber equipment, in order to indicate the time location of the SRS symbol of distributing to subscriber equipment, a kind of method is the method that adopts SRS cycle+subframe indication information.First subscriber equipment determines first radio frames at the SRS symbol place of distributing to it, this can be according to the radio frame number at its special-purpose SRS control signal place by calculating, for example, first radio frame number at its SRS symbol place equals the radio frame number at its special-purpose SRS control signal place.Or first radio frame number at its SRS symbol place is the radio frame number s to special-purpose SRS control signal place ctrlthe result quantizing according to a numerical value Q,
Figure BDA0000389805580000181
or
Figure BDA0000389805580000182
q can be certain fixing numerical value; Or Q depends on the SRS cycle P of subscriber equipment, for example, Q=P; Here, Q is the factor of SFN repetition period, and Q is 2 power.Or first radio frame number at its SRS symbol place is the radio frames s to special-purpose SRS control signal place ctrlor the time started of the radio frames after its quantification obtains after adding a fixing time delay τ, i.e. s ctrl+ τ, or
Figure BDA0000389805580000183
or
Figure BDA0000389805580000184
τ can be predefined or configure in broadcast channel.Or, by first radio frame number at its SRS symbol place of indication of showing in the special-purpose SRS signaling of subscriber equipment; Or a part of information of the radio frame number that comprises its SRS symbol place in the special-purpose SRS signaling of subscriber equipment, thereby according to the partial information of the radio frame number at the SRS symbol place in the radio frame number at special-purpose SRS control signal place and special-purpose SRS control signal, calculate first radio frames at the SRS symbol place of subscriber equipment.Next, the number of remembering the SRS symbol in a radio frames mostly is M most, to configuring the periodic quantity that is more than or equal to 5ms of sequence number 0,1,2 and 6 and the periodic quantity that is more than or equal to 10ms of configuration sequence number 3,4 and 5, subscriber equipment takies a position in M SRS symbol, and signaling bit number is ceil (log 2(M)).To the 2ms cycle, the subframe indication information in RRC signaling need to redefine as indicating the index of the combination of two SRS symbols, by restriction, from selecting the number of the available combination of 2 symbols in M symbol, makes it be less than or equal to ceil (log 2(M)), 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, guaranteed the uniform structure of RRC signaling.Similarly, to the 5ms cycle of configuration sequence number 3,4 and 5, the subframe indication information in RRC signaling need to redefine as indicating the index of the combination of two SRS symbols, and the number of the available combination of 2 SRS symbols of restriction selection, makes it be less than or equal to ceil (log 2(M)), 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, guaranteed the uniform structure of RRC signaling.
In the control signal of the special-purpose SRS that base station sends to subscriber equipment, 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 are all to determine by implicit method.The SRS cycle of the subscriber equipment of note base station configuration is P ms, every P ms, has a subframe to distribute to this subscriber equipment.Because there is P subframe in cycle P, subscriber equipment need to know which in this P subframe 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 position and the number N of SRS symbol p, and customer equipment identification u etc.When the SRS cycle of subscriber equipment, equal community SRS during the cycle, the SRS symbol of subscriber equipment is just on the SRS of all cell configuration symbol.When the SRS cycle of subscriber equipment, be greater than community SRS during the cycle, the method for the index in all available SRS symbol of the SRS symbol of implicit definite subscriber equipment in cycle P can be i sRS=f (u, s ctrl, N p), i for example sRS=mod (u, N p), or i sRS=mod (u+s ctrl, N p) etc.Like this, can be from certain reference time position, implicit definite SRS symbol, i.e. i sRSindividual SRS symbol, distributes to this subscriber equipment, and repeats this distribution according to cycle P.Here, reference time position can be the radio frames s at SRS dedicated control signaling place ctrltime started position.Reference time position can be also the radio frames s to SRS dedicated control signaling place ctrlthe result quantizing according to a numerical value Q, the SFN of reference time is or q can be certain fixing numerical value; Or Q depends on the SRS cycle P of subscriber equipment, for example, Q=P; Here, Q is the factor of SFN repetition period, and Q is 2 power.Reference time position can be also the radio frames s at SRS dedicated control signaling place ctrlor the time started of the radio frames after its quantification obtains after adding a fixing time delay τ, i.e. s ctrl+ τ, or
Figure BDA0000389805580000201
or
Figure BDA0000389805580000202
τ can be predefined or configure in broadcast channel.Or reference time position adopts other define method.This method both can be for FDD, also can be for TDD.To the 2ms cycle of TDD system and 5ms cycle, because be likely to distribute redefining of two SRS symbols in 5ms or 10ms.So the SRS cycle to these two kinds of subscriber equipmenies, its actual cycle is P (5ms or 10ms), and is in cycle P, to distribute two SRS positions.Implicit method of distributing stands good above, for example, first imply the position of first SRS symbol of determining subscriber equipment, then obtains the position of second SRS symbol.
For classification one, classification two and classification three above, for the situation that no matter configures any one sequence number of sequence number, when adopting in this step the physical resource that signaling indication SRS transmission takies, both can adopt elongated signaling also can adopt the signaling of fixed length.Elongated signaling length is the available physical sub-frame resources depending in step 1, and the Signalling Designing of fixed length can suppose that all sub-frame of uplink all may distribute to SRS and transmit to use in step 1.It is elongated signaling or fixed length signaling that standard agreement finally can be selected.
Because when configuration sequence number is different, it no matter is elongated or the Signalling Designing of fixed length, the bit number that the signaling of different configuration sequence number designs is needed may be identical, also can be in order to pursue uniform format, and adopt, in situation used, need the bit number that uses in the longest situation of bit number as the number of signaling bit.Or, fixing adopt k bit to indicate, the value of k is to be more than or equal to 0 and be less than max. number of bits here.
Step 3 in invention), in, UE receives the uplink channel resources information that can be used for 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 transmitting SRS signal of network configuration by D-BCH, UE obtains the dispatch of concrete transmitting SRS by RRC signalling, obtain the concrete physical channel resources that this UE transmitting SRS needs from dispatch.
Step 4 in invention), in, UE sends the SRS signal generating 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 obtaining in step 3, information such as transmission bandwidth and the comb of cyclic shift, SRS, specifically obtain the last SRS sequence sending of UE, after using power factor to be weighted change to the amplitude of transmitted power, on the physical resource of dispatch appointment, send SRS signal.
When two SCFDMA symbols that allow subscriber equipment simultaneously to take UpPTS send SRS, and UE sends respectively the SRS of different transmitting antennas, consider that between the antenna of subscriber equipment, conversion needs the time, the transmission timing advance regular hour τ of first the SCFDMA symbol of system in can predefine UpPTS; And second SCFDMA symbol in UpPTS be according to original transmission timed sending, thereby change for antenna at the interval that generation time is τ between two SCFDMA symbols of UpPTS.This time τ is conducive to the rising edge of the different user devices signal on two SCFDMA symbols of UpPTS and the interference between trailing edge equally.Here the size of τ depends on that the hardware of subscriber equipment realizes, and from standard, need to define the occurrence of this parameter.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 tetra-, and this device is comprised 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, the SRS sequence producing through this device completes SRS transmission through an antenna (407 or 408), the selection of transmitting antenna can be that network passes through RRC signal deployment, can be also according to system default, to be configured in 2 antennas 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.For fear of making, the description of this patent is too tediously long, in the following description, omitted the detailed description of function that the public is known or device etc.
The first embodiment:
In the corresponding form one of the present embodiment, configure sequence number and be 0 situation.
First, network by D-BCH configure 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 also Sub-frame2 (603) and Sub-frame3 (604) by the sub-frame of uplink resource of RRC signaling UE transmitting SRS simultaneously.
Then, UE obtains the physical resource information that the SRS transmission in two steps is above used, a SC-FDMA symbol (608) the transmission SRS signal on a SC-FDMA symbol on Sub-frame2 on (607) and Sub-frame3.
The second embodiment:
In the corresponding form one of the present embodiment, configure sequence number and be 1 situation.
First, network by D-BCH configure can transmitting SRS ascending resource comprise UpPTS (506), the Sub-frame2 (503) and Sub-frame3 (504) on Sub-framel (502), wherein, UpPTS is comprised of a SC-FDMA symbol.
Secondly, network is 2ms by the cycle of RRC signaling UE transmitting SRS, and network is also UpPTS and the Sub-frame2 on Sub-framel by the sub-frame of uplink resource of RRC signaling signaling UE transmitting SRS simultaneously.
Then, UE obtains the resource information in two steps above, at a SC-FDMA symbol (506) and the upper SRS signal that sends of the SC-FDMA symbol (507) on Sub-framel of UpPTS.
The 3rd embodiment:
In the corresponding form one of the present embodiment, configure sequence number and be 3 situation.
First, network by D-BCH configure can transmitting SRS ascending resource comprise UpPTS (704), Sub-frame2 (701), Sub-frame3 (702) and Sub-frame4 (703), wherein, UpPTS is comprised of a SC-FDMA symbol.
Secondly, network is 2ms by the cycle of RRC signaling UE transmitting SRS, and network is also UpPTS and Sub-frame2 by the sub-frame of uplink resource of RRC signaling UE transmitting SRS simultaneously.
Then, UE obtains the resource information in two steps above, the upper SRS signal that sends of SC-FDMA symbol (705) on the SC-FDMA of UpPTS symbol on (704) and Sub-frame2.
The 4th embodiment:
In the corresponding form one of the present embodiment, configure sequence number and be 6 situation.
First, network by D-BCH configure 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, UpPT S is respectively comprised of a SC-FDMA symbol.
Secondly, network is 5ms by the cycle of RRC signaling UE transmitting SRS, and network is also Sub-frame2 and Sub-frame7 by the sub-frame of uplink resource of signaling UE transmitting SRS simultaneously.
Then, UE obtains the resource information in two steps above, the upper SRS signal that sends of the SC-FDMA symbol (807) on Sub-frame2 and the SC-FDMA symbol (809) on Sub-frame7.
The 5th embodiment:
SC-FDMA symbol in supposing the system predefine UpPTS is for SRS transmission, and the number that limits the maximum SRS symbol in each field is 4.When UpPTS comprises a SC-FDMA, have at most three sub-frame of uplink for transmitting SRS in field, the probable value of the SRS symbol numbers that need to indicate at broadcast channel is 0,1,2 and 3; When UpPTS comprises two SC-FDMA, in field, there are at most two sub-frame of uplink for transmitting SRS, the probable value of the SRS symbol numbers that need to indicate at broadcast channel is 0,1 and 2, the sub-frame of uplink that interior the first two that these two sub-frame of uplink can be fields can be used.Like this, in broadcast channel, need to indicate with 2 bits the number of sub-frames of transmitting SRS, thereby obtain the SRS symbol numbers in each field and radio frames in conjunction with the symbol numbers of UpPTS.
When base station sends the SRS of a subscriber equipment of RRC signal deployment, cycle to 5,10,20,40,40,160 and 320ms of configuration sequence number 0,1,2 and 6, because have at most 8 positions that send SRS in each radio frames, so the position of the SRS symbol that need to take with 3 bit equipment for indicating users.
In cycle to the 2ms of configuration sequence number 0,1,2 and 6, its indication is 2 SRS symbols of user equipment allocation in field.Here, 2 SRS symbols that are limited in each field are continuous in position, and, because the SRS symbol maximum number in each field is 4, the combination of two possible SRS symbols has 3, possible combined number in a radio frames is 6, thereby still can indicate with 3 bits.If notice that the symbol numbers that configures the SRS in each field in broadcast channel is less than 2, the 2ms cycle unavailable, or all SRS symbols that are interpreted as in 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 there are at most 4 positions that send SRS in each radio frames, so position of the SRS symbol that can take with 2 bit equipment for indicating users, if need to keep the bit number of various configuration sequence numbers consistent, also can use 3 bits.
In 2ms (or 5ms) cycle to 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 field are continuous in position, because the SRS symbol maximum number in each field is 4, the combination of two possible SRS symbols has 3, so position of the SRS symbol that can take with 2 bit equipment for indicating users, if need to keep the bit number of various configuration sequence numbers consistent, also can use 3 bits.If notice that the symbol numbers that configures the SRS in radio frames in broadcast channel is less than 2,2ms (or 5ms) cycle unavailable, or all SRS symbols that are interpreted as in radio frames are all distributed to this subscriber equipment.
Then, UE obtains the resource information in two steps above, on corresponding SRS symbol, sends SRS signal.
Note, when UpPTS comprises two SC-FDMA, if allowed, in field, there are at most three sub-frame of uplink for transmitting SRS, the probable value of the SRS symbol numbers that need to indicate at broadcast channel is 0,1,2 and 3, still needs to indicate with 2 bits the number of sub-frames of transmitting SRS in broadcast channel.But because have at most 10 SRS symbols in each radio frames, so in the special-purpose SRS control signal of subscriber equipment, need to indicate with 4 bits the position of the SRS symbol of distributing to subscriber equipment.
The 6th embodiment:
The 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 broadcast signaling indication, if the resource of UpPTS is not taken by Random Access Channel, acquiescence is for SRS.In description below, do not repeating.Shown in table 1, be the SRS configuration in other sub-frame of uplink except UpPTS, need in broadcast channel, with 4 bits, send this information here.Here, 10 numerals of subframe sequence number represent respectively the configuring condition of each subframe in a radio frames, and 0 representative does not comprise SRS, and 1 representative has configured SRS.
Table 1: the SRS configuration in other sub-frame of uplink except UpPTS
Configuration sequence number System frame number SFN Subframe sequence number Describe
0 Any SFN 0000000000 There is no SRS symbol
1 The SFN of mould more than 40 0010000000 The 40ms cycle
2 The SFN of mould more than 41 0010000000 The 40ms cycle
3 The SFN of mould more than 42 0010000000 The 40ms cycle
4 The SFN of mould more than 43 0010000000 The 40ms cycle
5 Even number SFN 0010000000 The 20ms cycle
6 Even number SFN 0000000100 The 20ms cycle
7 Odd number SFN 0010000000 The 20ms cycle
8 Odd number SFN 0000000100 The 20ms cycle
9 Appoint and watch SFN 0010000000 The 10ms cycle
10 Appoint and watch SFN 0000000100 The 10ms cycle
11 Any SFN 0010000100 The 5ms cycle
12 Any SFN 0011000100 In 10ms, comprise 3 SRS symbols
13 Any SFN 0011000110 In 10ms, comprise 4 SRS symbols
14 Any SFN 0011100110 In 10ms, comprise 5 SRS symbols
15 Any SFN 0011100111 In 10ms, comprise 6 SRS symbols
Note, mainly proposed the configuring condition of SRS in 16 here, not that configuration corresponding to limitation arrangement sequence number.According to system, can not define all 16 above-mentioned configuring conditions, and only configure one of them subset, this subset is still within protection scope of the present invention.For example, a kind of to select the method for subset be the configuration sequence number 0,5,9,11,12,13,14 and 15 in employing table 1, thereby only need 3 bits to indicate in broadcast channel.
Table 2 is the SRS configurations in another possible other sub-frame of uplink except UpPTS.
Table 2: the SRS configuration in other sub-frame of uplink except UpPTS
Note, mainly proposed the configuring condition of SRS in 16 here, not that configuration corresponding to limitation arrangement sequence number.According to system, can not define all 16 above-mentioned configuring conditions, and only configure one of them subset, this subset is still within protection scope of the present invention.
If need to keep the signaling bit number of FDD and TDD system consistent, FDD need to carry out indicating cell SRS resource with 16 bits equally, can use table 3 configuration below.Here, SRS offset index can equal the index of SRS place subframe in one-period, or SRS offset index is by being mapped to someway the index of SRS place subframe in one-period.
The SRS configuration of table 3:FDD
Configuration sequence number The community SRS cycle (ms) SRS offset index Describe
0 Nothing Nothing There is no SRS
1 40 0 The 40ms cycle
2 40 1 The 40ms cycle
3 40 2 The 40ms cycle
4 20 0 The 20ms cycle
5 20 1 The 20ms cycle
6 20 2 The 20ms cycle
7 10 0 The 10ms cycle
8 10 1 The 10ms cycle
9 10 2 The 10ms cycle
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:
The present embodiment describe of the present invention a kind of in broadcast channel the method for indicating cell SRS character position.Here the LTE TDD system of take is example, and UpPTS may comprise one or two SCFDMA symbols, and when UpPTS comprises a SCFDMA symbol, this symbol is for SRS; When UpPTS comprises two SCFDMA symbols, these two symbols are all for SRS, or the resource except the resource for random access of these two symbols is for SRS.Like this, can, in the broadcast signaling of configuration SRS, with 1 bit information, indicate the number of the SCFDMA symbol that UpPTS comprises.
At this moment, still can adopt table 1 in embodiment six or table 2 or its part to indicate the SRS configuring condition in other sub-frame of uplink except UpPTS, and increase the number of symbols that 1 bit is indicated UpPTS, be one or two SCFDMA symbols of pPTS 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 a subset of table 1 or table 2, for example adopt the configuration sequence number 0,5,9,11,12,13,14 and 15 in table 1, only need 4 bits in broadcast channel, to indicate SRS configuration information.
The 8th embodiment:
The present embodiment is described a kind of method of indicating TDD system configuration in broadcast channel of the present invention, and the LTE TDD system of take is here example, 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), 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 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 altogether 7 bits.
Table 4: the configuration of special subframe
Figure BDA0000389805580000281
Table 5: ascending-descending subframes distributes
Figure BDA0000389805580000291
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 when combined coding, needing the configuration sum of indication is 9 * 7=63 like this, like this as long as 6 bits have just completed 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
Figure BDA0000389805580000292
the configuration sequence number that ascending-descending subframes in corresponding table 5 distributes; And the configuration sequence number of special subframe in definition mod (k, 9) corresponding table 4.Or the method for another kind of possible combined coding is definition
Figure BDA0000389805580000293
the configuration sequence number of the special subframe in corresponding table 4; And the configuration sequence number that ascending-descending subframes in definition mod (k, 7) corresponding table 5 distributes.The present invention does not limit the method for use two kinds of combined codings above, thereby but can other coding methods reach the object with the configuration information of 6 bit transfer tables 4 and table 5.
The 9th embodiment:
The present embodiment is described two examples of the present invention when SRS cycle maximum in community is 10ms.If the resource of hypothesis UpPTS is not taken by Random Access Channel here, acquiescence is for SRS.In table 6, T sFCthe community SRS cycle, Δ sFCit is community SRS symbol offset.Here, row Δ sFCeach numerical value be subframe sequence number, i.e. corresponding subframe 0～subframe 9.Subframe numbers corresponding to UpPTS in first field is that 1, the second subframe numbers corresponding to the UpPTS in 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 and does not configure SRS.In TDD system, it not necessarily.For example, because as long as base station configures only transmitting SRS in UpPTS, configured SRS configuration sequence number 0, base station can not send special-purpose SRS configuration signal to any user, thereby does not have any SRS transmission.Can there is not any harmful effect to the uplink of system like this, because base station does not configure SRS symbol in general sub-frame of uplink.So configuration sequence number 14 can retain, and also can remove.In addition, the present invention does not limit the whole or a part of configurations that adopt in configuration sequence number 0～13.
The SRS configuration of table 6:TDD
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 configure SRS N/A
Table 7 is another kind of possible collocation methods, here configure sequence number 11～16th, corresponding asymmetrical SRS configuration in 10ms, the number that configures at present sequence number in table 7 is greater than 16, thus need to from table 7, select maximum 16, thus guarantee that the bit number needing is 4 bits.For example, can retain configuration sequence number 0～10, and select 5 at most from configuration sequence number 11～16 and configuration sequence number 17, thereby total number is less than or equal to 16.For example, can option and installment sequence number 11～13 and configuration sequence number 17, thereby and configuration sequence number 0～10 form the form of 15, total bit number is 4 bits.
The SRS configuration of table 7:TDD
Figure BDA0000389805580000311
The tenth embodiment:
The present embodiment is described the other example of the present invention when SRS cycle maximum in community is 10ms.Here, mainly to the 10ms cycle, only increased in the UpPTS of field of each frame and configured SRS, in a normal sub-frames of each frame and the UpPTS of a field, configure SRS with only having increased, thereby neighbor cell can be in the UpPTS of different timing transmitting SRS, avoid the SRS phase mutual interference in UpPTS.Here, for the general subframe of SRS with for the UpPTS of SRS, can be positioned at identical field or different fields.In fact, to configuring the situation of SRS in the UpPTS of a normal sub-frames at each frame and a field, and the situation that configures SRS in a normal sub-frames of each frame and the UpPTS of two fields, the present embodiment is only listed several available collocation methods, in fact, when having remaining use configuration sequence number, can indicate more configuring condition.
In the option one of table 8, retained the configuration sequence number 0～13 of table 6, increased by two configuration sequence numbers, wherein, configuration sequence number 14 is only in the UpPTS of first field of each frame, to configure SRS; Configuration sequence number 15 is only in the UpPTS of second field of each frame, to configure SRS.
In the option 2 of table 8, retained 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, retained 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 the UpPTS transmitting SRS of a field at a frame.For the general subframe of SRS with for the UpPTS of SRS, can be positioned at identical field or different fields.Table 8 option 3 is to suppose that they are positioned at identical field.
In the option 4 of table 8, it is the configuration sequence number 14 and 15 that has increased table 8 option one on the basis of table 8 option 3.
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
Figure BDA0000389805580000331
Although below show the present invention in conjunction with the preferred embodiments of the present invention, one skilled in the art will appreciate that without departing 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 above-described embodiment, and should be limited by claims and equivalent thereof.

Claims (13)

1. a sending method of uplink detection reference signal SRS, comprises step:
A) obtain the cycle parameter of uplink channel resources and the position of SC-FDMA symbol that can be used for transmitting detection reference signal SRS;
B) if described cycle parameter is 2ms or for 5ms, UE sends with the actual cycle obtaining the SRS signal generating in advance.
2. method according to claim 1, is characterized in that, step a) in, UpPTS acquiescence is for transmitting SRS, and in broadcast channel, indicates the situation that configures SRS in general sub-frame of uplink.
3. method according to claim 2, is characterized in that, in the Dui5ms community SRS cycle, in each frame, only has UpPTS for SRS.
4. method according to claim 2, is characterized in that, in the Dui5ms community SRS cycle, indicates in the general subframe of each field and comprises SRS symbol.
5. method according to claim 2, is characterized in that, in the Dui5ms community SRS cycle, indicates two general subframes of each field to comprise SRS symbol.
6. method according to claim 2, is characterized in that, in the Dui5ms community SRS cycle, indicates 3 general subframes of each field to comprise SRS symbol.
7. method according to claim 2, is characterized in that, to the 10ms community SRS cycle, indicates a general subframe of each frame to comprise SRS symbol.
8. method according to claim 2, is characterized in that, to the 10ms community SRS cycle, indicate two general subframes of each frame to comprise SRS symbol, and this two general subframes position in field is different.
9. method according to claim 1, is characterized in that, step a) in, in broadcast channel, indicate the situation that configures SRS in UpPTS and general sub-frame of uplink.
10. method according to claim 9, is characterized in that, to the 10ms community SRS cycle, indicates a UpPTS of each frame for transmitting SRS.
11. methods according to claim 9, is characterized in that, to the 10ms community SRS cycle, and configuration SRS in the UpPTS of a field of each frame.
12. methods according to claim 9, is characterized in that, to the 10ms community SRS cycle, indicate configuration SRS in a normal sub-frames of each frame and the UpPTS of a field.
13. 1 kinds of LTE TDD UE send the device (406) of SRS, lower part, consist of:
Module (401), for generation of SRS sequence;
Module (402), for receiving SRS configuration information;
Module (403), for receiving SRS transmitting scheduling information;
Controller (404), for sending SRS sequence;
Module (405), for the Modulating Power factor.
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