CN101500242A - Method and apparatus for configuring uplink detection reference signal - Google Patents
Method and apparatus for configuring uplink detection reference signal Download PDFInfo
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- CN101500242A CN101500242A CNA2008100574621A CN200810057462A CN101500242A CN 101500242 A CN101500242 A CN 101500242A CN A2008100574621 A CNA2008100574621 A CN A2008100574621A CN 200810057462 A CN200810057462 A CN 200810057462A CN 101500242 A CN101500242 A CN 101500242A
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Abstract
The invention discloses a method for allocating upstream searching reference signal (SRS), including the following steps: the position of SRS in the up pilot frequency time slot (UpPTS) is determined; the time-frequency positions of each UE when sending SRS on the determined SRS position are dispatched according to the determined SRS position and the different requirements of the upstream searching cycle and bandwidth by each user equipment (UE) in the local cell; the information of the time-frequency positions is informed to the UE. The invention further discloses a device used for allocating the SRS. The invention provides the specific solution for allocating the SRS to UpRTS of the radio frame in time division duplexing (TDD) mode.
Description
Technical field
The present invention relates to the mobile communication technology field, particularly a kind of method and apparatus of collocating uplink sounding reference signal.
Background technology
3-G (Generation Three mobile communication system) (3G) adopts the CDMA multi-access mode, supports multimedia service, can have higher competitiveness in several years of future.But in order to ensure keep this competitiveness in the longer time, third generation partner program (3GPP) has started Long Term Evolution (Long Term Evolution, the LTE) research project of 3G wireless interface technology.The pith of Long Term Evolution comprises: reduce time delay, improve user data rate, improve the cost of power system capacity and covering and reduction operator.The LTE system supports frequency division multiplexing (FDD) and two kinds of patterns of time division multiplexing (TDD), its upstream physical layer access technology be the multiplexing multiple access of single carrier frequency division (Single Carrier-FrequencyDivision Multiple Access, SC-FDMA).
Wherein the frame structure of tdd mode as shown in Figure 2.A complete radio frames length T f is 10ms, comprises that two length are the field of 5ms.Each field is divided into the conventional time slot that 8 length are 0.5ms, and (Time Slot, TS) with 1 special area that length is 1ms, this special area is made of descending pilot frequency time slot (DwPTS), protection time slot (GP) and uplink pilot time slot (UpPTS).Per two conventional time slots are composed of a subframe.The LTE system is based on OFDM (OFDM) technology, and its subcarrier spacing is set at 15kHz, and corresponding OFDM symbol lengths is 66.67us.When supporting that unicast service and little covering are used, use the short Cyclic Prefix (CP) of length as 4.7us, every time slot is made of 7 OFDM symbols; When supporting that many cell broadcaste services and big covering are used, use the long CP of length as 16.66us, this moment, each time slot was made of 6 OFDM symbols.
Frame structure for tdd mode, in its special area, the position of GP and length can according to other TDD systems, as time division multiplexing S-CDMA (Time Division-Synchronous-Code Division Multiple Access, TD-SCDMA) or the compatibility requirement of tdd CDMA (TD-CDMA) etc. be provided with, also proportional with the covering radius of LTE TDD system.By adjusting position and the length of GP, the also corresponding adjustment of the length of DwPTS and UpPTS is that 1ms is constant but keep three's total length.
In the LTE system, uplink detection reference signal (Sounding Reference Signal, SRS) be very important, the base station can be carried out the measurement of uplink signal-channel quality with uplink detection reference signal on the one hand, this measurement result is as the foundation of ascending resource scheduling, and this point all is suitable for for fdd mode and tdd mode; On the other hand, for tdd mode, according to the symmetry of up-downgoing channel, scheduling downlink resource and wave beam forming can carry out according to the quality condition of the up channel of being measured by SRS.
Under the tdd mode, uplink and downlink timeslot ratio is configurable, promptly exist descending sub frame more than sub-frame of uplink, even has only the situation of a sub-frame of uplink in the field of a 5ms, therefore in a sub-frame of uplink a plurality of SC-FDMA symbols of configuration to be used to send SRS also necessary, can both use the uplink SRS symbol to carry out ascending channel detecting to guarantee all users.
Prior art has only proposed the base station can dispose one or more SC-FDMA symbols transmission SRS in UpPTS, but does not propose concrete allocation plan.
Summary of the invention
In view of this, the embodiment of the invention proposes a kind of method and apparatus of collocating uplink sounding reference signal, has provided the concrete solution of base station configuration uplink detection reference signal.
The method of the configuration SRS that the embodiment of the invention proposes comprises:
Determine the position of SRS among the uplink pilot time slot UpPTS;
According to the position of determined SRS, and, dispatch each UE sends SRS in the position of determined SRS time-frequency position according to the different demands of each UE in this sub-district to uplink detection cycle and bandwidth;
With described time-frequency location information notification UE.
The device of the collocating uplink sounding reference signal SRS that the embodiment of the invention proposes comprises:
Position determination unit is used for determining the original position of the SRS of UpPTS;
Scheduling unit is used for the original position according to the determined SRS of described position determination unit, and according to the different demands of each UE in this sub-district to uplink detection cycle and bandwidth, dispatches each UE sends SRS in the position of determined SRS time-frequency position;
Notification unit is used for described time-frequency location information notification UE.
The present invention program can realize the SRS signal configures in the UpPTS of the radio frames of tdd mode.
Description of drawings
Fig. 1 is the wireless frame structure schematic diagram of the LTE system of tdd mode;
Fig. 2 is the SRS configuration state schematic diagram of the embodiment of the invention one;
Fig. 3 is the SRS configuration state schematic diagram of the embodiment of the invention two;
Fig. 4 is the SRS configuration state schematic diagram of the embodiment of the invention three;
Fig. 5 is the block diagram of the device of the configuration SRS that proposes of the embodiment of the invention four.
Embodiment
The SRS allocation plan that the embodiment of the invention proposes is applicable to tdd mode.By the base station SRS is configured in the UpPTS time slot, can has one or more SC-FDMA symbols to be used to send SRS among the UpPTS, the base station determines to carry the particular location of SRS according to actual conditions; The base station is with the configuration notification UE of the concrete transmission position of SRS.
Base station in the embodiment of the invention comprises the SRS inking device, and the SRS inking device can dispose each sub-district SRS shared character position in UpPTS according to three kinds of diverse ways, below sets forth respectively by three specific embodiments.
Embodiment one: each neighbor cell SRS is become identical in the position configuration of the shared character position of UpPTS.
The specific implementation flow process of present embodiment comprises the steps:
Steps A 1: determine the position of the SRS among the UpPTS, with the original position of the same SD-FDMA symbol among all neighbor cell radio frames UpPTS as SRS;
Step B1: according to the position of determined SRS, and according to the different demands of each UE in this sub-district to uplink detection cycle and bandwidth, send the time-frequency domain position that is fit to of SRS by the different UE of dispatch scheduling, so-called time-domain position is meant each character position among the UpPTS, and so-called frequency domain position is meant on which frequency resource block on these character positions;
Step C1: with described time-frequency location information notification UE.
After finishing above-mentioned layoutprocedure, UE can send SRS in the time-frequency position of appointment.
When SRS is configured in when sending in one or more symbols among the UpPTS, the same position that all sub-districts all are configured in SRS among the UpPTS sends, and the benefit of doing like this is that complexity is low, is easy to realize.As shown in Figure 2, the Serving cell of UE1, UE2 and UE3 is respectively A, B and C (UE1, UE2 and UE3 are positioned at the intersection of A, B and C), and A, B, C are neighbor cell, and adopts identical special time slot configuration SRS.With UpPTS length is that 2 SC-FDMA symbols are example, base station A, base station B are configured in SRS character position identical among the UpPTS with base station C, the SRS signal that so a certain this community user of cell detection sends also carries out the interference that can receive the SRS signal that other neighbor cell edge customers send when uplink signal-channel quality is measured, and certainty of measurement reduces.
Preferably, every the default time cycle, the SRS inking device repeats above-mentioned steps A1 to step C1, realizes the renewal of SRS configuration.
Embodiment two: each neighbor cell SRS is configured to difference in the start-stop position of the shared character position of UpPTS, reaches the interconnected effect in minizone.
Present embodiment specific implementation flow process comprises the steps:
The base station of steps A 2:SRS inking device and a plurality of neighbor cells communicates, the UpPTS slot length of knowing each neighbor cell (is the value of M, this M value normally each sub-district is identical), with each neighbor cell need be in the UpPTS time slot the shared symbolic number (be the value of N, this each sub-district of N value can be different) of SRS.
Step B2:SRS inking device is according to the UpPTS slot length M and the shared symbolic number N of SRS of each neighbor cell that is obtained, adopt the method for Time Division Multiplexing in UpPTS, to dispose SRS, being neighbor cell is configured in different SC-FDMA character positions in the UpPTS time slot with SRS, and then the problem of inter-cell interference of SRS can be eliminated fully.As shown in Figure 3, with M=6, N=2 is an example, and the neighbor cell that is configured in of SRS staggers fully, and the presence of intercell interference of SRS has been eliminated fully.
Step C2: according to the position of determined SRS, and according to the different demands of each UE in this sub-district to uplink detection cycle and bandwidth, send the time-frequency domain position that is fit to of SRS by the different UE of dispatch scheduling, so-called time-domain position is meant each character position among the UpPTS, and so-called frequency domain position is meant on which frequency resource block on these character positions.
Step D2: with described time-frequency location information notification UE.
After finishing above-mentioned layoutprocedure, UE can send SRS in the time-frequency position of appointment.
Preferably, every the default time cycle, the SRS inking device repeats above-mentioned steps A2 to step D2, realizes the renewal of SRS configuration.
Embodiment three: select the allocation position of SRS in UpPTS at random for each neighbor cell, for example can use the cell id of each sub-district to select with certain random algorithm as random seed.
The specific implementation flow process and the embodiment two of present embodiment are similar, the specific practice that is configuration SRS position among the described step B2 is different, adopt stochastic selection algorithm, make each sub-district in an available M symbol, select N symbol configuration to send SRS at random, this selection can repeatedly repeat and dynamic or semi-static renewal with system's operation, and guarantee that the selected probability of M symbol is identical, the SRS collision probability of neighbor cell just greatly reduces like this, has effectively reduced the presence of intercell interference that SRS causes.For example, as shown in Figure 4, with M=2, N=1 is an example, and T1 at a time, base station A choose first symbol configuration SRS of UpPTS, and base station B has chosen second symbol, and base station C has chosen first symbol.Though because the restriction that the UpPTS available symbols is counted M can't accomplish that the SRS configuration of neighbor cell is staggered fully, compare situation shown in Figure 2, the probability of neighbor cell SRS collision still greatly reduces, promptly the presence of intercell interference of SRS has also obtained alleviating.
Preferably, every the default time cycle, the SRS inking device repeats the step of SRS config update.
For embodiment one and embodiment two, the allocation position update notifications cycle of the SRS of each sub-district of SRS inking device in the UpPTS time slot can be very slow, for example can be several hrs, perhaps do not upgrade and promptly notify identical content at every turn; For embodiment three, then need the update cycle faster, can with a few minutes the update cycle for example, concrete cycle selection should be the result of the compromise consideration of signaling consumption and interference randomization effect.
The embodiment of the invention four proposes a kind of device that disposes SRS, and this device is arranged in the base station, as shown in Figure 5, comprising:
Position determination unit 501 is used for determining the original position of the SRS of UpPTS;
Scheduling unit 502 is used for the original position according to described position determination unit 501 determined SRS, dispatches each UE sends SRS in the position of determined SRS time-frequency position
Notification unit 503 is used for described time-frequency location information notification UE.
Preferably, described device can further include:
Acquiring unit 504, the slot length M and each neighbor cell that are used for obtaining the UpPTS of each neighbor cell need be at the shared symbolic number N of UpPTS time slot configuration SRS;
The original position that then described position determination unit 501 is determined SRS according to slot length M that acquiring unit obtained and symbolic number N.
Described position determination unit 501 can be selected the original position of SRS by three kinds of modes, specifically as described in the embodiment one to embodiment three.If adopt embodiment three described modes, then position determination unit 501 can further include chooser unit at random, is used for selecting N symbol to dispose SRS at random at an available M symbol.
This device further comprises: timing control unit 505, be used for every the preset time cycle, control the original position that described position determination unit 501 redefines SRS, described scheduling unit 502 sends the time-frequency position of SRS according to the SRS original position scheduling user's set that redefines, and by notification unit 503 with described time-frequency position informing UE.
Embodiment of the invention scheme can reach following technique effect: provided the concrete solution of SRS signal configures in the UpPTS of the radio frames of tdd mode, wherein the scheme of embodiment one proposition is relatively simple, and the problem of disturbing between neighbor cell can also further be eliminated or alleviate to the SRS allocation plan of embodiment two, three.
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 (10)
1, the method for a kind of collocating uplink sounding reference signal SRS is characterized in that, comprising:
Determine the position of SRS among the uplink pilot time slot UpPTS;
According to the position of determined SRS, and, dispatch each UE sends SRS in the position of determined SRS time-frequency position according to the different demands of each user equipment (UE) in this sub-district to uplink detection cycle and bandwidth;
With described time-frequency location information notification UE.
2, the method for configuration SRS according to claim 1, it is characterized in that the position of the SRS among described definite UpPTS is: the original position of the SRS of each neighbor cell in UpPTS is set to identical.
3, the method for configuration SRS according to claim 1 is characterized in that, the position of the SRS among the UpPTS of described definite each neighbor cell comprises:
Obtain the slot length M of UpPTS of each neighbor cell and each neighbor cell need be in the UpPTS time slot the shared symbolic number N of SRS;
The position that disposes the SRS of each neighbor cell according to described slot length M and symbolic number N.
4, the method for configuration according to claim 3 SRS is characterized in that, the described position that disposes the SRS of each neighbor cell according to described slot length M and symbolic number N is:
Be configured to the original position of the SRS of the UpPTS of each neighbor cell different.
5, the method for configuration according to claim 3 SRS is characterized in that, the described position that disposes the SRS of each neighbor cell according to described slot length M and symbolic number N is:
In an available M symbol, select N symbol to dispose SRS at random.
6, according to the method for each described configuration SRS of claim 1 to 5, it is characterized in that this method further comprises:, carry out above-mentioned steps once more every the preset time cycle.
7, the device of a kind of collocating uplink sounding reference signal SRS is characterized in that, this device comprises:
Position determination unit is used for determining the original position of the SRS of UpPTS;
Scheduling unit is used for the original position according to the determined SRS of described position determination unit, and according to the different demands of each UE in this sub-district to uplink detection cycle and bandwidth, dispatches each UE sends SRS in the position of determined SRS time-frequency position;
Notification unit is used for described time-frequency location information notification UE.
8, the device of configuration SRS according to claim 7 is characterized in that described device further comprises:
Acquiring unit, the slot length M and each neighbor cell that are used for obtaining the UpPTS of each neighbor cell need be at the shared symbolic number N of UpPTS time slot SRS;
The original position that then described position determination unit is determined SRS according to slot length M that acquiring unit obtained and symbolic number N.
9, the device of configuration SRS according to claim 8 is characterized in that described position determination unit further comprises chooser unit at random, is used for selecting N symbol to dispose SRS at random at an available M symbol.
10, according to each described device that disposes SRS of claim 7 to 9, it is characterized in that, this device further comprises: timing control unit, be used for every the preset time cycle, control the original position that described position determination unit redefines SRS, described scheduling unit sends the time-frequency position of SRS according to the SRS original position scheduling user's set that redefines, and by notification unit with described time-frequency position informing UE.
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