CN102281087A - Communication method, carrier wave dispatching method, base station and terminal - Google Patents
Communication method, carrier wave dispatching method, base station and terminal Download PDFInfo
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- CN102281087A CN102281087A CN2010101981533A CN201010198153A CN102281087A CN 102281087 A CN102281087 A CN 102281087A CN 2010101981533 A CN2010101981533 A CN 2010101981533A CN 201010198153 A CN201010198153 A CN 201010198153A CN 102281087 A CN102281087 A CN 102281087A
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Abstract
The invention provides a communication method and a carrier wave dispatching method, as well as a corresponding base station and a corresponding terminal. The communication method executed by the terminal comprises the following steps of: detecting the downlink channel quality of each sub-carrier wave; selecting a sub-carrier wave according to the detected downlink channel quality; and sending a Sounding sequence on the selected sub-carrier wave. The carrier wave dispatching method executed by the base station comprises the following steps of: receiving the Sounding sequence; identifying the terminal which sends the Sounding sequence on each sub-carrier wave; and allowing the dispatching competition between the terminal which sends the Sounding sequence on each sub-carrier wave and each sub-carrier wave.
Description
Technical field
The application relates to wireless communication technology, more specifically, relates to communication means and carrier scheduling method and relevant base station and terminal in the wireless communication system.
Background technology
In the wireless communication system of for example TDD-LTE system, in order to carry out the processing of descending wave beam forming by the base station, usually send a known array (promptly by user terminal, the Sounding sequence), the base station is by detecting this sequence and utilizing the characteristic of the up-downgoing symmetry of channel to obtain descending channel information.The transmission of Sounding sequence can divide three kinds of modes to dispose by frequency division, time-division and sign indicating number.Frequency division is meant that each terminal can send the Sounding sequence on continuous different sub carrier; Time-division is meant that terminal can send the Sounding sequence on last symbol of different descending time slots; The terminal that then is meant the sign indicating number branch can adopt mutually orthogonal codeword sequence to send the Sounding sequence.
For existing this system, the main application of Sounding sequence is to make the base station end can obtain the information of down channel, thereby uses EBB wave beam forming mode to carry out transfer of data.Because terminal does not know which subcarrier can be scheduled when sending the Sounding sequence, so need on full bandwidth, send the Sounding sequence usually, otherwise the subcarrier that does not send the Sounding sequence just can not be scheduled, and will lose the frequency selective scheduling gain like this.Yet, when system uses big bandwidth (for example, in the time of 20MHz), because therefore the transmit power limited of terminal is difficult on the full bandwidth with enough power emission Sounding sequences.
Summary of the invention
The application's purpose is that for the wireless communication system that uses big bandwidth, the user terminal in the system can either have enough power to send the Sounding sequence, can not lose again or frequency of loss selectivity scheduling gain as few as possible.
For this reason, the application has proposed a kind of communication means, comprising: the down channel quality that detects each subcarrier; According to the down channel quality chooser carrier wave that is detected; And on selected subcarrier, send the Sounding sequence.
The application has also proposed a kind of terminal, comprising: detection module, detect the down channel quality of each subcarrier; Select module, according to the down channel quality chooser carrier wave that is detected; And sending module, on selected subcarrier, send the Sounding sequence.
The application has also proposed a kind of carrier scheduling method, comprising: receive the Sounding sequence; Be identified in the terminal that has sent the Sounding sequence on each subcarrier; And, allow to be identified as the terminal that has sent the Sounding sequence thereon and participate in its scheduling competition for each subcarrier.
The application has also proposed a kind of base station, comprising: receiver module receives the Sounding sequence; Identification module is identified in the terminal that has sent the Sounding sequence on each subcarrier; And scheduler module, for each subcarrier, allow to be identified as the terminal that has sent the Sounding sequence thereon and participate in its scheduling competition.
According to the application's execution mode, terminal only sends the Sounding sequence on the parton carrier wave preferably at down channel quality, thereby having guaranteed that terminal has enough transmitting powers under the situation of big bandwidth sends the Sounding sequence.Simultaneously, because terminal sends the Sounding sequence on the subcarrier preferably at down channel quality, therefore, can frequency of loss selectivity scheduling gain yet.In addition,, therefore, also reduced the interference between the Sounding sequence, further improved the accuracy of detection of base station Sounding because all user terminals all send the Sounding sequence on corresponding parton carrier wave.
Description of drawings
Fig. 1 exemplarily shows the flow chart according to an execution mode of the application's terminal communicating method;
Fig. 2 exemplarily shows the flow chart of the detection step among Fig. 1;
Fig. 3 exemplarily shows the flow chart according to an execution mode of the application's carrier scheduling method;
Fig. 4 exemplarily shows the flow chart according to another execution mode of the application's carrier scheduling method;
Fig. 5 exemplarily shows the structure chart according to the application's terminal; And
Fig. 6 exemplarily shows the structure chart according to the application's base station.
Embodiment
Below, the illustrative embodiments to the application describes in detail with reference to the accompanying drawings.
Fig. 1 exemplarily shows the flow chart according to the terminal communicating method 100 of an execution mode of the application.This method is particularly useful for the TDD-LTE system.As shown in the figure, at step S101, terminal detects the down channel quality of each available subcarrier in the system.In one embodiment, terminal is by detecting the down channel quality that descending signal quality detects each available subcarrier.In this case, down channel quality for example can be characterized by the received signal to noise ratio of CRS (public reference signal).As shown in Figure 2, when for example representing down channel quality with the received signal to noise ratio of CRS, the step S101 that detects down channel quality can further comprise: receive the descending CRS on each subcarrier in step S1011; And,, calculate the received signal to noise ratio of the CRS on each subcarrier based on CRS that receives and known standard C RS at step S1012.
At step S102,, select to be used for sending the subcarrier of Sounding sequence based on the down channel quality of detected each subcarrier.For example, can select the subcarrier of down channel quality greater than predetermined threshold; Perhaps select subcarrier predetermined quantity, that have best down channel quality.Detecting with above-mentioned CRS is example, in step S102, can select the CRS received signal to noise ratio greater than the subcarrier of predefined threshold value as the subcarrier that sends the Sounding sequence; Perhaps, can select one or more subcarriers predetermined quantity, that have maximum CRS received signal to noise ratio as the subcarrier that sends the Sounding sequence.Particularly, the CRS signal to noise ratio that records can be sorted according to size, and therefrom select CRS noise ordering the most forward for example three or five subcarriers.Then, at step S103, on selected subcarrier, send the Sounding sequence.
By such mode, terminal only sends the Sounding sequence on the parton carrier wave preferably at down channel quality, rather than on full bandwidth, send the Sounding sequence, thereby can guarantee that terminal has enough transmitting powers under the situation of big bandwidth sends the Sounding sequence, thereby further guarantees in the correct detection of base station end to the Sounding sequence.Simultaneously because terminal sends the Sounding sequence on the subcarrier preferably at down channel quality, and down channel quality preferably subcarrier most possibly be the subcarrier of this terminal scheduling just, therefore, also can the scheduling of frequency of loss selectivity not gain.In addition,, therefore, can also reduce the interference between the Sounding sequence, further improve accuracy of detection Sounding because all user terminals all send the Sounding sequence on corresponding parton carrier wave.
The Sounding sequence of above-mentioned transmission is received by the base station.Fig. 3 shows the method for carrier dispatching is carried out in the base station based on the Sounding sequence that receives the flow chart of illustrative embodiments 300.
With reference to Fig. 3, at step S301, the Sounding sequence that the base station receiving terminal sends.As indicated above, each terminal only sends the Sounding sequence on the parton carrier wave.Then, at step S302, the base station has sent the terminal of Sounding sequence on each subcarrier according to the Sounding recognition sequence that receives.At step S303, for each subcarrier, the base station allows to be identified as the terminal that has sent the Sounding sequence on this subcarrier and participates in its scheduling competition.For example, can dispatch for these terminals, take the time slot of this carrier wave for these terminal distribution by existing dispatching algorithm.The terminal that does not send the Sounding sequence on this subcarrier does not participate in the scheduling competition of this subcarrier.
In one embodiment, if terminal sent before the Sounding sequence that is sending on this subcarrier is the long period, the length between apparent time and determine whether this user participates in the scheduling competition of this subcarrier then.This is because if it is too of a specified duration to receive the time of this Sounding sequence, the message that comprises this Sounding sequence has then lost actual effect, so this user no longer participates in the scheduling competition of this subcarrier.
Fig. 4 exemplarily shows carrier scheduling method 400 in this case.Step S401-S403 among Fig. 4 is identical with step S301-S303 in the execution mode shown in Figure 3, therefore no longer is repeated in this description at this.As described in Figure, carrier scheduling method 400 further comprises step S404 and S405.At step S404, determine whether the Sounding sequence that sends is expired on each subcarrier, for example, determine whether to have surpassed predetermined value to time of current time, if then determine expired from receiving this Sounding sequence.When determining that Sounding sequence that certain terminal sends is expired on this carrier wave,, forbid that this terminal continues to participate in the scheduling competition of this subcarrier at step S405, then, return step S403,, allow to remove this terminal counterpart terminal afterwards and participate in its scheduling competition for this carrier wave; Otherwise, directly return step S403.
More than terminal communicating method and carrier scheduling method according to the application are described.Although said method is particularly useful for the TDD-LTE system, the scheme that it should be appreciated by those skilled in the art that the application is not limited in and is used for the TDD-LTE system, and for example, it is also applicable to other OFDMA system.
Below, the terminal and the base station of carrying out said method is described respectively.
With reference to Fig. 5, can comprise detection module 501, select module 502 and sending module 503 according to the application's terminal 500.Detection module 501 detects the down channel quality of each subcarrier.Select module 502 according to down channel quality chooser carrier wave.Sending module 503 sends the Sounding sequence on selected subcarrier.
Down channel quality for example can be characterized by the received signal to noise ratio of public reference signal.In this case, detection module 501 can further comprise receiving element 5011 and computing unit 5012.The descending public reference signal that receiving element 5011 receives on each subcarrier.Computing unit 5012 calculates the received signal to noise ratio of the public reference signal on each subcarrier based on public reference signal that receives and known standard public reference signal.Select module 502 according to the down channel quality chooser carrier wave that is detected.For example, select module 502 can select the subcarrier of down channel quality greater than predetermined threshold; Or selection subcarrier predetermined quantity, that have best down channel quality.
With reference to Fig. 6, can comprise receiver module 601, identification module 602 and scheduler module 603 according to the application's base station 600.Receiver module 601 receives the Sounding sequence.Identification module 602 is identified in the terminal that has sent the Sounding sequence on each subcarrier.For each subcarrier, scheduler module 603 allows to be identified as the terminal that has sent the Sounding sequence thereon and participates in its scheduling competition.
In one embodiment, base station 600 also can comprise determination module 604, is used to determine whether the Sounding sequence that sends on each subcarrier is expired.For example, determination module 604 can determine whether surpassed predetermined value from receiving this Sounding sequence to time of current time, if then determine expired.When determination module 604 determined that Sounding sequence that certain terminal sends is expired on this carrier wave, scheduler module 603 forbade that this terminal continues to participate in the scheduling competition of this subcarrier.
The exemplary execution mode of above reference is described the application, should be appreciated that, above-mentioned execution mode should not be considered as the restriction to the application's scope.Those skilled in the art can carry out various the modification in distortion to above-mentioned execution mode under the prerequisite of the spirit and scope that do not depart from the application.The application's protection range is defined by the claims.
Claims (12)
1. communication means comprises:
The down channel quality of each available subcarrier in the detection system;
According to the down channel quality chooser carrier wave that is detected; And
On selected subcarrier, send the Sounding sequence.
2. the method for claim 1, wherein comprise according to the step of the down channel quality chooser carrier wave that is detected:
Select the subcarrier of down channel quality greater than predetermined threshold; Perhaps
Select subcarrier predetermined quantity, that have best down channel quality.
3. method as claimed in claim 1 or 2, wherein, described down channel quality is characterized by the received signal to noise ratio of public reference signal.
4. method as claimed in claim 3, wherein, the step that detects the down channel quality of each available in described system subcarrier comprises:
Receive the descending public reference signal on each subcarrier; And
Based on public reference signal that receives and known standard public reference signal, calculate the received signal to noise ratio of the public reference signal on each subcarrier.
5. terminal comprises:
Detection module detects the down channel quality of each subcarrier;
Select module, according to the down channel quality chooser carrier wave that is detected; And
Sending module sends the Sounding sequence on selected subcarrier.
6. terminal as claimed in claim 5, wherein, described selection module is selected the subcarrier of down channel quality greater than predetermined threshold; Or selection subcarrier predetermined quantity, that have best down channel quality.
7. as claim 5 or 6 described terminals, wherein, described down channel quality is characterized by the received signal to noise ratio of public reference signal.
8. terminal as claimed in claim 7, wherein, described detection module comprises:
Receiving element receives the descending public reference signal on each subcarrier; And
Computing unit based on public reference signal that receives and known standard public reference signal, calculates the received signal to noise ratio of the public reference signal on each subcarrier.
9. carrier scheduling method comprises:
Receive the Sounding sequence;
Be identified in the terminal that has sent the Sounding sequence on each subcarrier; And
For each subcarrier, allow to be identified as the terminal that has sent the Sounding sequence thereon and participate in its scheduling competition.
10. method as claimed in claim 9 also comprises:
Determine whether the Sounding sequence that sends is expired on each subcarrier; And
When determining that Sounding sequence that certain terminal sends is expired on this subcarrier, forbid that this terminal continues to participate in the scheduling competition of this subcarrier.
11. a base station comprises:
Receiver module receives the Sounding sequence;
Identification module is identified in the terminal that has sent the Sounding sequence on each subcarrier; And
Scheduler module for each subcarrier, allows to be identified as the terminal that has sent the Sounding sequence thereon and participates in its scheduling competition.
12. base station as claimed in claim 11 also comprises:
Determination module determines whether the Sounding sequence that sends is expired on each subcarrier; And
When described determination module determined that Sounding sequence that certain terminal sends is expired on this subcarrier, described scheduler module forbade that this terminal continues to participate in the scheduling competition of this subcarrier.
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| WO2014012406A1 (en) * | 2012-07-19 | 2014-01-23 | 华为技术有限公司 | Method and device for allocating channel resources of wlan and wireless local area network communication system |
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| CN101299871A (en) * | 2007-04-30 | 2008-11-05 | 大唐移动通信设备有限公司 | Method, system, base station and terminal for transmitting upstream detection pilot frequency |
| CN101729457A (en) * | 2008-10-17 | 2010-06-09 | 上海交通大学 | Dynamic subcarrier associated limit bit feedback and dispatching method |
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| CN102448078A (en) * | 2010-10-09 | 2012-05-09 | 电信科学技术研究院 | Monitoring processing method for radio link on auxiliary carrier and user equipment |
| WO2014012406A1 (en) * | 2012-07-19 | 2014-01-23 | 华为技术有限公司 | Method and device for allocating channel resources of wlan and wireless local area network communication system |
| CN103582137A (en) * | 2012-07-19 | 2014-02-12 | 华为技术有限公司 | WLAN channel resource distributing method and device and wireless local area network communication system |
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