CN101771463A - Method, device and system for sending uplink sounding reference signal - Google Patents
Method, device and system for sending uplink sounding reference signal Download PDFInfo
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Abstract
The invention discloses a method for sending an uplink sounding reference signal in a multi-carrier system, and the method is applied in the multi-carrier system and comprises the following steps: determining the time position of sending the uplink sounding reference signal (SRS) on a working carrier; determining the time position of sending the SRS signal on a non-working carrier based on the principle of time division multiple access (TDM) in the multi-carrier; and sending the SRS signal in the determined time position of the working carrier and the time position of the non-working carrier, wherein each time position comprises a sign position or a sub-frame and the like. The invention further discloses a user equipment which comprises a working carrier time position determining unit, a non-working carrier time position determining unit and an SRS signal sending unit. The scheme of the invention can achieve the purpose of sending the SRS signal at a certain bandwidth stipulated by all carriers of the multi-carrier system or the communication protocol within a certain time.
Description
Technical field
The present invention relates to the multi-carrier wireless communication technical field, particularly a kind of methods, devices and systems that send uplink detection reference signal.
Background technology
In Long Term Evolution project (LTE) system, uplink detection reference signal (Sounding ReferenceSignals, SRS) be the upward signal that subscriber equipment (UE) sends, carrying out up timing for the base station detects, power control, up frequency domain dispatching, operations such as link circuit self-adapting provide channel condition information.For time division duplex (TDD) system, when descending employing was transmitted based on pretreated many input and output (MIMO), the base station can use the SRS signal to carry out channel estimating, and then utilizes up-downgoing channel symmetry characteristic, obtained downlink channel condition information (CSI).
In the current generation LTE standard, following regulation has been carried out in the transmission of uplink detection reference signal:
For same UE, the transmission cycle of SRS comprises 2ms, 5ms, and 10ms, 20ms, 40ms, 80ms, 160ms, 320ms be totally eight kinds of cycles.SRS is on multiplexing last SC-FDMA symbol at sub-frame of uplink on the time domain, and for the TDD system, SRS can also send at uplink pilot time slot (UpPTS).UE sends duration, cycle, time-domain position, frequency domain position and the frequency hopping pattern of SRS and is indicated by high-level signaling by the base station.
For long-term evolution multi-carrier (LTE-A) system, for supporting the system bandwidth wideer than LTE system, such as 100MHz, a kind of may be the frequency spectrum that directly distributes the 100M bandwidth, a kind of may be to distribute to some spectrum aggregatings of existing system, gather into big bandwidth and supply with the use of LTE-A system, as shown in Figure 1.Base station and subscriber equipment can adopt the transmission of asymmetrical transmission mode in the LTE-A system, and promptly descending carrier is unequal with the up-link carrier bandwidth or number is different, as shown in Figure 2.But according to existing SRS scheme, the base station is to obtain downlink channel condition information according to up-downgoing channel symmetry characteristic, the base station can only obtain the state information of the down channel of up-link carrier correspondence, then can't know its downlink channel condition information for other descending carrier.
Summary of the invention
In view of this, the objective of the invention is to, propose a kind of method and apparatus that sends uplink detection reference signal, can reach the purpose that sends the SRS signal within a certain period of time in certain bandwidth of whole carrier waves of multicarrier system or communication protocol regulation.
For ease of describing, make as giving a definition:
Work carrier wave: the carrier wave of current subframe transmit ascending data;
Inoperative carrier wave: support subscriber equipment to send the SRS signal, but be not used for the carrier wave of transfer of data in current subframe.
Send the method for uplink detection reference signal in a kind of multicarrier system that the embodiment of the invention proposes, this method is applied to multicarrier system, and comprises the steps:
Determine to send on the work carrier wave time location of uplink detection with reference to the SRS signal;
Based on the principle of time division multiple access in the multicarrier, determine to send on the inoperative carrier wave time location of SRS signal;
On the time location of determined work carrier wave and inoperative carrier wave, send the SRS signal.
The embodiment of the invention also proposes a kind of subscriber equipment, comprising:
Work subcarrier time position determination unit is used for determining to send on the work carrier wave time location of SRS signal;
Inoperative subcarrier time position determination unit is used for according to based on the time division multiple access principle,, determine to send on the inoperative carrier wave time location of SRS signal;
The SRS signal transmitting unit, be used on the determined work subcarrier time of described work subcarrier time position determination unit position, sending the SRS signal, and on the determined inoperative subcarrier time of described inoperative subcarrier time position determination unit position, send the SRS signal.
As can be seen from the above technical solutions, the present invention adopts in the multicarrier time division multiple access to send the SRS signal with principle on work carrier wave and inoperative carrier wave, thereby the certain bandwidth that is implemented in inherent whole carrier waves of multicarrier system of certain hour or communication protocol regulation sends the SRS signal, reaches the purpose of effectively obtaining base station and user device channel information.Wherein according to subscriber equipment or system requirements ability, can be supported in same time location and adopt single (continuously) carrier wave, perhaps many (dispersing) carrier wave sends the SRS signal.
Description of drawings
Fig. 1 is the schematic diagram of multi-carrier polymerizing in the LTE-A system;
Fig. 2 be base station and subscriber equipment in the LTE-A system asymmetric transmission mode on/schematic diagram of descending carrier;
Fig. 3 is a kind of method flow diagram that sends the SRS signal of the present invention;
Fig. 4 is the running time-frequency resource distribution schematic diagram of the transmission SRS signal of the embodiment of the invention one;
Fig. 5 is the running time-frequency resource distribution schematic diagram of the transmission SRS signal of the embodiment of the invention two;
Fig. 6 is the running time-frequency resource distribution schematic diagram of the transmission SRS signal of the embodiment of the invention three;
Fig. 7 has provided the embodiment of the invention because the running time-frequency resource distribution schematic diagram of the transmission SRS signal under the limited case of uplink single-carrier;
Fig. 8 is a kind of subscriber equipment block diagram that the embodiment of the invention four proposes;
Fig. 9 is the another kind of subscriber equipment block diagram that the embodiment of the invention five proposes.
Embodiment
The SRS signal can send at work carrier wave and inoperative carrier wave, and the bandwidth that sends the SRS signal here is the part bandwidth (being the part carrier wave) of system bandwidth (being whole carrier waves) or communication protocol regulation (all kinds of control signalings or base station and terminal acquiescence).The present invention program is based on the principle of time division multiple access in the multicarrier, sending on the existing work carrier wave on the basis of SRS signal, on the inoperative carrier wave, send the SRS signal, thereby the certain bandwidth that is implemented in inherent whole carrier waves of multicarrier system of certain hour or communication protocol regulation sends the SRS signal, reaches the purpose of effectively obtaining base station and user device channel information.The method of the transmission SRS signal that the present invention proposes comprises the steps: as shown in Figure 3
Step 301: determine to send on the work carrier wave time location of uplink detection with reference to the SRS signal;
Step 302:, determine to send on the inoperative carrier wave time location of SRS signal according to the principle of time division multiple access in the multicarrier;
The principle of time division multiple access in the described multicarrier can be utilized the multicarrier characteristic exactly, sends the SRS signal at one time on a plurality of carrier waves of position; Also can utilize the time division multiple access principle, on the different time position, send the SRS signal.Described time location can be subframe internal symbol position or subframe position.
Step 303: on the time location of determined work carrier wave and inoperative carrier wave, send the SRS signal.
For making the purpose, technical solutions and advantages of the present invention clearer, be that subframe position is an example below with the time location, the present invention is further elaborated in conjunction with specific embodiments.
Embodiment one: in adjacent two work carrier wave SRS signal sending times intervals, insert the SRS signal of one or more inoperative carrier wave of transmission according to certain rule (communication protocol agreement or signaling indication configuration).Reach traversal within a certain period of time to system bandwidth or part bandwidth.Can be between the time between the subframe of work adjacent transmission SRS signal on the carrier wave arbitrary subframe, be determined to many one or N inoperative carrier wave inoperative carrier waves for transmission SRS signal on described subframe.N is the number of inoperative carrier wave.The subframe that sends the SRS signal on each inoperative carrier wave can have the identical time cycle, also can have the different time cycles.
Fig. 4 shows the running time-frequency resource distribution schematic diagram of the transmission SRS signal of the embodiment of the invention one, and wherein each grid is represented a subframe of a subcarrier, and time span is 1ms.When the work carrier wave transmission SRS signal period is 5ms, according to mode shown in Figure 4, comprise 4 idle subframes between the subframe of adjacent two transmission SRS on the work carrier wave, first idle subframe sends the SRS signal on inoperative carrier wave 1, second idle subframe sends the SRS signal on inoperative carrier wave 2 also the rest may be inferred.Do not change the work carrier wave SRS signal period thereby reach, insert the purpose of feedback inoperative carrier wave SRS signal.
Embodiment two: send the time location at the subframe place of SRS signal at fixed work carrier wave, select at the most 1 or N the inoperative carrier wave inoperative carrier wave as transmission SRS signal.N is the number of inoperative carrier wave.Wherein the SRS information number of inoperative carrier wave transmission is determined according to the rule that pre-sets by the signaling indication configuration or the subscriber equipment of communication protocol agreement, base station.
Preferably, can determine to send on each inoperative carrier wave the subframe of SRS signal respectively, the subframe that makes different inoperative carrier waves send the SRS signal differs from one another, but the subframe of transmission SRS signal is the subframe that the work carrier wave sends the SRS signal on each inoperative carrier wave.For different inoperative carrier waves, its time cycle that sends the subframe of SRS signal can be the same or different.
Fig. 5 is the running time-frequency resource distribution schematic diagram of the transmission SRS signal of the embodiment of the invention two.The carrier wave 2ms cycle is sent as example to work, when the work carrier wave sends the SRS signal, send the SRS signal at the inoperative carrier wave, the 1st subframe as shown in Figure 5, send the SRS signal on work carrier wave and inoperative carrier wave 2, the 3rd subframe sending the SRS signal on work carrier wave and inoperative carrier wave 1.The cycle that sends the SRS signal on inoperative carrier wave 1 and the inoperative carrier wave 2 is 4ms.
Embodiment three: according to the subframe that sends the SRS signal on the indication information configuration inoperative carrier wave from the base station.
Fig. 6 is the running time-frequency resource distribution schematic diagram of the transmission SRS signal of the embodiment of the invention three.Subscriber equipment receives the indication information that carries inoperative carrier identification and subframe sign from the base station, and described inoperative carrier identification and subframe are identified corresponding subframe as the subframe that sends the SRS signal on the inoperative carrier wave.
Determine the subframe of transmission SRS signal on the inoperative carrier wave according to the foregoing description method after, when the carrier wave number that sends the SRS signal in same subframe is subjected to some restriction, (for example power limited, single carrier etc.), when perhaps working carrier wave and inoperative carrier wave SRS signal transmission conflict, need send according to the walk off from one's job SRS signal of carrier wave or inoperative carrier wave of certain rule, its rule is by communication protocol agreement or signaling indication configuration.
Fig. 7 has provided because the running time-frequency resource distribution schematic diagram of the transmission SRS signal under the limited case of uplink single-carrier.Subscriber equipment can only send the SRS signal a subframe on a carrier wave, for example in subframe 1, suppose to determine that work carrier wave and inoperative carrier wave 2 send the SRS signal, but because the restriction of single carrier, must abandon the transmission of inoperative carrier wave SRS signal according to certain principle (here for example according to the principle of prioritised transmission work carrier wave SRS signal).Again for example in subframe 6, same generation work carrier wave and inoperative carrier wave SRS signal conflict, at this moment according to certain principle (here for example according to the limited transmitting SRS signal of inoperative carrier wave, perhaps the base station command carrier wave that walks off from one's job sends the principle of SRS signal), the transmission of the carrier wave SRS signal that walks off from one's job.
More generally speaking, subscriber equipment sends after the subframe of SRS signal on determining work carrier wave and inoperative carrier wave, whether the number of the SRS signal that judgement sends on work on the current subframe carrier wave and inoperative carrier wave surpasses the threshold value that sets in advance, if, then the part SRS signal that abandons on the current subframe according to following arbitrary principle makes its restriction of satisfying described threshold value, carries out the described step that sends the SRS signal on the subframe of determined work carrier wave and inoperative carrier wave again; Otherwise directly carry out the step that on the subframe of determined work carrier wave and inoperative carrier wave, sends the SRS signal;
Described principle comprises:
Preferentially abandon work carrier wave SRS signal;
Preferentially abandon inoperative carrier wave SRS signal;
Order abandons the SRS signal of work carrier wave and/or inoperative carrier wave;
Indication abandons the SRS signal of work carrier wave and/or inoperative carrier wave according to the base station signaling.
Perhaps, subscriber equipment also can abandon work carrier wave and/or the inoperative carrier wave SRS signal on current subframe according to the signaling indication from the base station.
Fig. 8 is a kind of subscriber equipment that the embodiment of the invention four proposes, and comprising:
Work carrier wave subframe determining unit 801 is used for determining to send on the work carrier wave subframe of SRS signal;
Inoperative carrier wave subframe determining unit 802 is used for the principle according to inoperative carrier wave traversal, determines to send on the inoperative carrier wave subframe of SRS signal;
SRS signal transmitting unit 803 is used for sending the SRS signal on described work carrier wave subframe determining unit 801 determined work carrier wave subframes, and sends the SRS signal on described inoperative carrier wave subframe determining unit 802 determined inoperative carrier wave subframes.
Fig. 9 is the another kind of subscriber equipment that the embodiment of the invention five proposes, and this subscriber equipment also comprises except having work carrier wave subframe determining unit 801, inoperative carrier wave subframe determining unit 802 and SRS signal transmitting unit 803:
Discarding unit 806, be used for according to index signal from judging unit 805, the part SRS signal that notice SRS signal transmitting unit 803 abandons on the current subframe simultaneously with the number notifications count unit 804 of the SRS signal that abandons, makes the count value of counting unit 804 less than described threshold value.
Then described SRS signal transmitting unit 803 abandons the SRS signal according to the notice of discarding unit 806, and the SRS signal of remainder is sent to the base station.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. send the method for uplink detection reference signal in the multicarrier system, it is characterized in that, comprise the steps:
Determine to send on the work carrier wave time location of uplink detection with reference to the SRS signal;
Based on the principle of time division multiple access TDM in the multicarrier, determine to send on the inoperative carrier wave time location of SRS signal;
On the time location of determined work carrier wave and inoperative carrier wave, send the SRS signal.
2. method according to claim 1 is characterized in that, the step that sends the time location of SRS signal on described definite inoperative carrier wave comprises:
Send SRS signal time position at fixed work carrier wave, select at the most an inoperative carrier wave as the carrier wave that sends the SRS signal.
3. method according to claim 1 is characterized in that, the step that sends the time location of SRS signal on described definite inoperative carrier wave comprises:
At the time location of fixed work carrier wave transmission SRS signal, select N carrier wave that the inoperative carrier wave is a transmission SRS signal on described time location at the most, described N is the number of inoperative carrier wave.
4. method according to claim 1 is characterized in that, the step that sends the time location of SRS signal on described definite inoperative carrier wave comprises:
Arbitrary time location between the time location of transmission SRS signal adjacent on the fixed work carrier wave selects at the most an inoperative carrier wave as the carrier wave that sends the SRS signal.
5. method according to claim 1 is characterized in that, the step that sends the time location of SRS signal on described definite inoperative carrier wave comprises:
Arbitrary time location between the time location of transmission SRS signal adjacent on the fixed work carrier wave is selected N carrier wave that the inoperative carrier wave is a transmission SRS signal on described time location at the most, and described N is the number of inoperative carrier wave.
6. method according to claim 1 is characterized in that, the step that sends the time location of SRS signal on described definite inoperative carrier wave comprises:
According to communication protocol agreement between base station and the subscriber equipment and/or receive from the indication of base station indication signaling, with described agreement and/or indication time corresponding position and inoperative carrier wave as the time location that sends the SRS signal and send the carrier wave of described SRS signal.
7. according to each described method of claim 1 to 5, it is characterized in that the time location that sends the SRS signal on each inoperative carrier wave has the identical time cycle.
8. according to each described method of claim 1 to 6, it is characterized in that, described before sending the SRS signal on the time location of determined work carrier wave and inoperative carrier wave, further comprise:
Whether the number of the SRS signal that judgement sends on work on the current time position carrier wave and inoperative carrier wave surpasses the threshold value that sets in advance, if, then abandon locational part SRS signal of current time and make its restriction of satisfying described threshold value, carry out the described step that on the time location of determined work carrier wave and inoperative carrier wave, sends the SRS signal again according to following arbitrary principle; Otherwise directly carry out the step that on the time location of determined work carrier wave and inoperative carrier wave, sends the SRS signal;
Described principle comprises:
Or/and the control signaling of base station is indicated, preferentially abandon work carrier wave SRS signal according to the agreement of the communication protocol between base station and the subscriber equipment;
Or/and the control signaling of base station is indicated, preferentially abandon inoperative carrier wave SRS signal according to the agreement of the communication protocol between base station and the subscriber equipment;
Or/and the control signaling of base station is indicated, order abandons the SRS signal of work carrier wave and/or inoperative carrier wave according to the agreement of the communication protocol between base station and the subscriber equipment.
9. according to each described method of claim 1 to 6, it is characterized in that, described before sending the SRS signal on the time location of determined work carrier wave and inoperative carrier wave, further comprise:
Signaling indication according to from the base station abandons work carrier wave and/or inoperative carrier wave at locational SRS signal of current time.
10. according to each described method of claim 1 to 6, it is characterized in that described time location is the character position or the subframe position of subframe.
11. a subscriber equipment is characterized in that, comprising:
Work subcarrier time position determination unit is used for determining to send on the work carrier wave time location of SRS signal;
Inoperative subcarrier time position determination unit is used for according to based on the time division multiple access principle,, determine to send on the inoperative carrier wave time location of SRS signal;
The SRS signal transmitting unit, be used on the determined work subcarrier time of described work subcarrier time position determination unit position, sending the SRS signal, and on the determined inoperative subcarrier time of described inoperative subcarrier time position determination unit position, send the SRS signal.
12. subscriber equipment according to claim 11 is characterized in that, described subscriber equipment further comprises:
Counting unit is used for the output signal according to work subcarrier time position determination unit and inoperative subcarrier time position determination unit, and the number of the SRS signal that sends on the current time position is counted; Also be used to receive number, described count value deducted the number of the described SRS signal that abandons from the SRS signal that abandons of discarding unit;
Judging unit is used to judge whether the count value of described counting unit surpasses the threshold value that sets in advance, if then send index signal to discarding unit;
Discarding unit is used for according to from the indication signaling of judging unit, and notice SRS signal transmitting unit abandons locational part SRS signal of current time, simultaneously with the number notifications count unit of the SRS signal that abandons;
Then described SRS signal transmitting unit abandons the SRS signal according to the notice of discarding unit, and the SRS signal of remainder is sent to the base station.
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