CN102832983B - Signaling method and base station - Google Patents

Abstract

The present invention discloses a signal sending method and a base station, which are applied to a beamforming system, wherein the signal sending method includes: when the base station sends a signal to a user p at a certain time p', obtain the information of all users in the base station at the time p' RSSI value; according to the RSSI value, determine the user paired with user p at time p'; at time p', send a signal to user p and the user paired with user p on the same channel. Through the present invention, the problem of limited system capacity of the beamforming system is solved, thereby achieving the effects of increasing the system capacity of the beamforming system and enhancing product competitiveness.

Description

Signal transmission method and base station

technical field

The present invention relates to the communication field, in particular, to a signal sending method of a beamforming system and a base station.

Background technique

With the continuous development of mobile communication technology, smart antenna as a key technology has been widely concerned by everyone, and beamforming as a core technology of smart antenna is also one of the hot issues. In the field of array signal processing, beamforming technology is to reconstruct the source signal from the sensor array, and realize the separation of the signal by increasing the contribution of the desired source or suppressing the interference source.

With the advancement of wireless technology, the application of beamforming technology is becoming more and more extensive. Usually, beamforming technology is used to improve the coverage of the base station, or to improve the user traffic by improving the signal quality on the terminal side. These take advantage of the ability of beamforming to focus energy in one direction. But at the same time, beamforming can also weaken energy radiation in other directions. For example, for 4-antenna (circular array) beamforming, the signal energy can be reduced by more than 10 decibels (dB) within the range of plus or minus 80 degrees from the convergence direction, and the signal energy can be reduced within the range of plus or minus 160 degrees from the convergence direction More than 20dB, and the signal energy can even drop by more than 30dB within the range of plus or minus 170 degrees away from the convergence direction. The space selectivity is stronger for 8 antennas.

Because of the above characteristics of the beamforming technology, currently, in the beamforming system, when sending a signal to a user, usually only one user can be sent a signal at a time, and the system capacity of the beamforming system is limited.

Contents of the invention

The main purpose of the present invention is to provide a signal transmission method of a beamforming system and a base station, so as to at least solve the above-mentioned problem of limited system capacity of the beamforming system.

According to one aspect of the present invention, a signal transmission method is provided, which is applied to a beamforming system, including: when a base station transmits a signal to a user p at a certain time p', obtain the received signals of all users in the base station at time p' Strength RSSI value; according to the RSSI value, determine the user paired with user p at time p'; at time p', send a signal to user p and the user paired with user p on the same channel.

Preferably, according to the RSSI value, the step of determining the user paired with user p at time p' includes: finding user q with the smallest RSSI value from the RSSI values of all users at time p', and determining user q as the user p paired with user p paired users.

Preferably, after finding the user q with the smallest RSSI value and before determining that the user q is the user paired with the user p, the method further includes: the base station obtains the RSSI value of the user q at time q', and the RSSI value of user p at time q' value, where time q' is the time when the base station sends a signal to user q; judge whether the difference between the RSSI value of user p at time p' and the RSSI value of user p at time q' is greater than the entry threshold of user p, and user q The difference between the RSSI value at time q' and the RSSI value of user q at time p' is greater than the entry threshold of user q; when the judgment results are all yes, user q is determined to be the user paired with user p.

Preferably, at time p', the step of sending signals to user p and the user paired with user p on the same channel includes: shaping the data of user p and the user paired with user p respectively, obtaining user p and the user paired with user p The shaped data of the user paired with p; the shaped data of the user p and the user paired with the user p are combined; and the combined shaped data is sent on the corresponding antenna.

Preferably, before the step of determining the user paired with user p at time p' according to the RSSI value, it also includes: judging whether user p has been paired; Carrier-to-interference and noise ratio CINR value; judge whether the CINR value of user p at time p' is greater than the exit threshold of user p, and whether the CINR value of user r at time p' is greater than the exit threshold of user r; if the judgment results are all If yes, user p and user r continue to be paired; otherwise, user p and user r are unpaired, and the step of determining the user paired with user p at time p' according to the RSSI value is performed.

Preferably, when the base station sends a signal to a user p at a certain time p', before the step of obtaining the RSSI values of all users in the base station at time p', it also includes: all users in the base station report their respective RSSI at each time value and CINR value.

Preferably, the signal sending method further includes: if there is no user paired with user p, the base station sends the signal to user p in a normal beamforming manner at time p'.

According to another aspect of the present invention, a base station is provided, which is applied to a beamforming system, including: a first acquisition module, configured to acquire all users in the base station at a time when p' sends a signal to a user p The received signal strength RSSI value of p'; the pairing module is used to determine the user paired with user p at time p' according to the RSSI value; the sending module is used to send messages to user p and user p on the same channel at time p' p The paired user sends a signal.

Preferably, the pairing module includes: a first pairing module, configured to find the user q with the smallest RSSI value from the RSSI values of all users at time p', and determine that user q is the user paired with user p.

Preferably, the first pairing module includes: a minimum value module, used to find the user q with the smallest RSSI value from the RSSI values of all users at the time p'; a second acquisition module, used to obtain user q at the time p' The RSSI value of q', and the RSSI value of user p at time q', wherein, time q' is the time when the base station sends a signal to user q; the first judgment module is used to judge whether user p has the RSSI value at time p' The difference between the RSSI value of user p at time q' is greater than the entry threshold of user p, and the difference between the RSSI value of user q at time q' and the RSSI value of user q at time p' is greater than the entry threshold of user q; the determination module , used to determine that user q is the user paired with user p when the judgment results of the first judgment module are all yes.

Preferably, the base station further includes: a second judging module, used to judge whether user p has been paired before the pairing module determines the user paired with user p at time p' according to the RSSI value; a third obtaining module, used if If the judgment result of the second judging module is yes, then obtain the carrier-to-interference and noise ratio CINR value of the user p and the user r that has been paired with it at the time p'; the third judging module is used to judge the user p at the time p' Whether the CINR value is greater than the exit threshold of user p, and whether the CINR value of user r at time p' is greater than the exit threshold of user r; if the judgment results are both yes, user p and user r continue to pair; otherwise, user p and user r Unpair and enter the pairing module.

Through the present invention, signals are simultaneously sent to a certain user and users paired with the user on the same channel at the same time, so that one signal transmission in the beamforming system is no longer only for a single user, but is sent to multiple users at the same time, In this way, the problem of limited system capacity of the beamforming system is solved, and the effect of improving the system capacity of the beamforming system and enhancing product competitiveness is achieved.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

FIG. 1 is a flow chart of the steps of a signal sending method according to Embodiment 1 of the present invention;

FIG. 2 is a flow chart of steps of a signal sending method according to Embodiment 2 of the present invention;

FIG. 3 is a flow chart of steps of a signal sending method according to Embodiment 3 of the present invention;

Fig. 4 is a flow chart of steps for user pairing in the embodiment shown in Fig. 3;

Fig. 5 is a schematic diagram of performing spatial multiplexing on paired users in the embodiment shown in Fig. 3;

Fig. 6 is a structural block diagram of a base station according to Embodiment 4 of the present invention.

detailed description

Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

Embodiment one

Referring to FIG. 1 , it shows a flowchart of steps of a signal sending method according to Embodiment 1 of the present invention.

The signal sending method of this embodiment is applied to a beamforming system, and includes the following steps:

Step S102: When the base station sends a signal to a user p at a certain time p', obtain the RSSI (Received Signal Strength Indication, received signal strength) values of all users in the base station at the time p'.

Wherein, the time p' may be a time pre-allocated by the base station for user p, or an unspecified time used when the base station sends a signal to user p. The RSSI value is the signal strength received by the user. In this step, when the base station sends a signal to user p at time p', it is necessary to obtain the RSSI values of all users in the base station at this time p' as a pairing parameter for user p.

Step S104: The base station determines the user paired with user p at time p' according to the RSSI value.

Based on the obtained RSSI values of all users at time p', the base station searches for a user paired with user p from multiple users. Among them, being able to pair means that if signals are sent to multiple users on the same channel at the same time, and the signal quality of the multiple users still meets the requirement greater than the minimum demodulation threshold, then the multiple users can be paired, that is, pairing is required After that, the signal quality of each user still meets the requirement of being greater than the minimum demodulation threshold. Under this principle, generally speaking, there may be one user who can be paired with a user, of course, there may be more than one, or there may be none.

Step S106: the base station sends a signal to user p and the user paired with user p on the same channel at time p'.

After determining the user paired with user p at time p', the base station simultaneously sends signals to multiple users that can be paired on the same channel. Therefore, the characteristics of the beamforming are effectively utilized, and the system capacity is improved.

In related technologies, when a base station of a beamforming system sends a signal to a user, it usually can only send a signal to one user at a certain moment, and the system capacity of the beamforming system is limited. Through this embodiment, the signal is sent to a certain user and the user paired with the user at the same time on the same channel, so that a signal transmission in the beamforming system is no longer only for a single user, but is sent to multiple users at the same time. , thereby solving the problem of limited system capacity of the beamforming system, thereby achieving the effect of improving the system capacity of the beamforming system and enhancing product competitiveness.

Embodiment two

Referring to FIG. 2 , it shows a flowchart of steps of a signal sending method according to Embodiment 2 of the present invention.

The signal sending method of this embodiment is applied to a beamforming system, and includes the following steps:

Step S202: the base station allocates a time for each user, and sends a signal to the user at this time.

For example, assign a time p' to user p, assign a time q' to user q, and so on.

Step S204: the base station asks all users to report their RSSI value and CINR (Carrier to Interference plus Noise Ratio, Carrier to Interference plus Noise Ratio) value at each moment.

The base station preferably allows all users to report their RSSI values and CINR values at each moment, but it is not limited thereto. The base station may also allow all users to report their respective RSSI value and CINR value at time p'. The RSSI value and CINR value can be reported at the same time, or only the RSSI value can be reported this time, and the CINR value can be reported when necessary, so as to determine whether a user can continue to pair with the user who has been paired with it. Alternatively, only the RSSI value may be reported, and the users are paired each time.

The base station preferably allows all users to report their RSSI value and CINR value at each moment, which can make the base station know the status of each user in time, and also enable the base station to continuously revise the RSSI table and CINR table of each user time, and according to the new RSSI Table and CINR table calculate and revise the pairing table of each user, and then determine the signal transmission mode of each user according to the pairing table, and so on.

In addition, the base station can allow all users to report their RSSI value and CINR value at each moment, or only when it needs to send a signal to a certain user such as user p at time p', let all users report their respective RSSI values at time p' In addition to the RSSI value and CINR value, rules can also be set according to actual needs, so that all users report their RSSI value and CINR value at a certain moment or certain moments, such as periodic reporting methods, etc., the present invention does not limit this.

Step S206: The base station judges which users can be paired and which users cannot be paired or need to be disconnected according to the recorded RSSI value and CINR value.

This step is an optimal solution. In actual use, the CINR value may not be reported, and no judgment is made. At each moment p', a paired user is determined for user p. However, through this step, it is possible to more quickly determine whether the paired user of user p can continue to pair with the CINR value as a parameter. In the case that the pairing can be continued, the pairing time is greatly saved, the calculation amount is reduced, and the system efficiency is improved.

In the case of reporting the RSSI value and CINR value, or in the case of reporting only the RSSI value, the base station can find the user q with the smallest RSSI value from the RSSI values of all users at time p', and determine that user q is the same as The user that user p is paired with. By determining the user with the smallest RSSI value as the user paired with the user p, the implementation is simple, the pairing can be performed quickly, and the signal transmission speed and efficiency are improved.

Step S208: at a certain user moment, the base station not only sends a signal to the user, but also sends a signal to the user paired with it on the same channel.

In this embodiment, the base station allows all users to report their RSSI value and CINR value at each moment, thereby continuously revising the RSSI table and CINR table of each user moment, and revising the RSSI table and CINR table of each user according to the new RSSI table and CINR table. The pairing table, and then determine the signal transmission mode of each user according to the pairing table, and the cycle repeats. Compared with the prior art, the capacity of the system is improved, and the competitiveness of the product is enhanced.

Embodiment three

Referring to FIG. 3 , it shows a flowchart of steps of a signal sending method according to Embodiment 3 of the present invention.

The signal sending method of this embodiment is applied to a beamforming system, and includes the following steps:

Step S302: the base station allocates a time for each user, and sends a signal to the user at this time.

Step S304: the base station asks all users to report their RSSI value and CINR value at each moment.

For the convenience of expression, assuming that there are n users in total, for user time p', the RSSI value of each user is recorded as: RSSI _p'1 , RSSI _p'2 , ..., RSSI _p'p , ..., RSSI _p'n ; The CINR values of the user at time p' are denoted as CINR _p'1 , CINR _p'2 , . . . , CINR _p'p , . . . , CINR _p'n . These values are updated every user time.

Step S306: The base station judges which users can be paired and which users cannot be paired or need to be disconnected according to the recorded RSSI value and CINR value.

This step is specifically shown in Figure 4, taking the pairing judgment of user p as an example, including the following steps:

Step S3062: first confirm whether the user p has been paired, if yes, execute step S3064; if not, execute step S3066.

Step S3064: If already paired (assumed to be user r), determine whether CINR _p'p is greater than user p's exit threshold SNR _op , and whether CINR _p'r is greater than user r's exit threshold SNR _or . If both meet the requirements, user p and user r can continue pairing, and step S308 is performed. Otherwise, user p and user r are paired off, and step S3066 is performed.

For a certain modulation and coding method, to make the bit error rate after demodulation less than a certain value, the signal-to-noise ratio of the signal must meet a certain condition, which is usually called the demodulation threshold. In practical applications, two kinds of demodulation thresholds are usually used to avoid the ping-pong effect, one is the entry threshold and the other is the exit threshold. If the signal-to-noise ratio of the signal is greater than the entry threshold of a certain modulation and coding method, the transmitter can transmit the signal in the modulation and coding method. If the signal-to-noise ratio of the signal is lower than the exit threshold of a certain modulation and coding method, the transmitter needs to exit the modulation and coding method and send signals in a lower-order modulation and coding method.

Step S3066: If there is no pairing, find the minimum value among the RSSI values of each user at time p'. Assume that the minimum value found is the RSSI _p'q of user q at time p'. Then find out the RSSI _q'q and RSSI _q'p values at time q' from the records. Then calculate whether (RSSI _p'p -RSSI _q'p ) is greater than the entry threshold SNR _ip of user p, and whether (RSSI _q'q -RSSI _p'q ) is greater than the entry threshold SNR _iq of user q, if yes, user p and user q can be paired. Otherwise, it cannot be paired.

In addition, a pairing table can also be made to record the pairing situation of each user, so as to facilitate subsequent pairing processing.

Step S308: The base station judges whether user p has a paired user, and determines the signal transmission method according to the pairing table. If there is no paired user, execute step S310; if there is a paired user, execute step S312.

Step S310: Taking user time p' as an example, if user p is not paired, send the data of user p according to the ordinary beamforming method (that is, the data of user p is multiplied by the shaping value of each antenna and sent to the corresponding antenna) , the signal sending process ends.

Step S312: If user p is paired with user q, at user time p', in addition to sending the signal of user p, the signal of user q should also be sent at the same time.

In this step, spatial multiplexing of paired users is shown in Figure 5, including:

Step 1: Shape the data of user p (that is, multiply the shape values of user p for each antenna respectively).

Step 2: Shape the data of user q (that is, multiply the shape values of user q for each antenna respectively).

Step 3: Merge (add) the shaped data of the corresponding antennas of user p and user q.

Step 4: Send the combined shaped data to the corresponding antenna and send it out.

Since the signals sent by each antenna have been shaped, after the signal reaches the user, the corresponding user's signal will be strengthened, while the user's signal in other directions will be weakened. As long as the interference signals of other users do not reduce the signal quality of this user below its demodulation threshold (SNR) (this situation is avoided by calculation during pairing), the data demodulation of this user will not be affected. In this way, the multiplexing of frequency and time is realized through space shaping, and the capacity of the system is improved.

Embodiment four

Referring to FIG. 6 , it shows a structural block diagram of a base station according to Embodiment 4 of the present invention.

The base station of this embodiment is applied to a beamforming system, including: a first acquisition module 602, configured to acquire the RSSI values of all users in the base station at time p' when a signal is sent to a user p at a certain time p'; a pairing module 604, configured to determine the user paired with user p at time p' according to the RSSI value; the sending module 606, configured to send signals to user p and the user paired with user p on the same channel at time p'.

Preferably, the pairing module 604 includes: a first pairing module, configured to find the user q with the smallest RSSI value from the RSSI values of all users at time p', and determine that user q is the user paired with user p.

Preferably, the first pairing module includes: a minimum value module, which is used to find the user q with the smallest RSSI value from the RSSI values of all users at time p'; the second acquisition module is used to obtain user q at time q' and the RSSI value of user p at time q', where time q' is the time when the base station sends a signal to user q; the first judging module is used to judge the RSSI value of user p at time p' and user p Whether the difference between the RSSI value at time q' is greater than the entry threshold of user p, and whether the difference between the RSSI value of user q at time q' and the RSSI value of user q at time p' is greater than the entry threshold of user q; the determination module , used to determine that user q is the user paired with user p when the judgment results of the first judgment module are all yes.

Preferably, the base station in this embodiment further includes: a second judging module, used to judge whether user p has been paired before the pairing module 604 determines the user paired with user p at time p' according to the RSSI value; the third acquiring module , used to obtain the CINR value of user p and the user r that has been paired with it at time p' if the judgment result of the second judgment module is yes; the third judgment module is used to judge the CINR value of user p at time p' Whether it is greater than the exit threshold of user p, and whether the CINR value of user r at time p' is greater than the exit threshold of user r; if the judgment results are both yes, user p and user r continue to pair; otherwise, user p and user r are separated , enter the pairing module 604 .

Preferably, the sending module 606 includes: a shaping module, configured to shape the data of user p and the user paired with user p respectively, and obtain the shaped data of user p and the user paired with user p; a merging module for Combining the shaped data of the user p and the user paired with the user p; the combined sending module is used to send the combined shaped data on the corresponding antenna.

Preferably, the sending module 606 further includes: a normal sending module, configured to send a signal to user p by the base station in a normal beamforming manner at time p' if there is no user paired with user p.

Preferably, the base station in this embodiment further includes: a reporting module, configured to allow all users in the base station to report their respective RSSI values and CINR values at each moment.

Through the base station of this embodiment, the signal sending methods of the above-mentioned multiple embodiments can be implemented, and have corresponding effects and functions in the method embodiments, so details are not repeated here.

From the above description, it can be seen that the present invention makes full use of the space selection capability of the beamforming technology, and provides a signal sending method applied to the multi-antenna beamforming technology. Sending signals effectively increases the system capacity.

Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Alternatively, they may be implemented in program code executable by a computing device so that they may be stored in a storage device to be executed by a computing device, and in some cases in an order different from that shown here The steps shown or described are carried out, or they are separately fabricated into individual integrated circuit modules, or multiple modules or steps among them are fabricated into a single integrated circuit module for implementation. As such, the present invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (11)

1. A kind of 1. signaling method, applied to beamforming system, it is characterised in that including：

   Base station at a time p ' to user p send signal when, obtain in the base station all users in the moment p ' Received signal strength RSSI value；

   According to the RSSI value, it is determined that in the user of the moment p ' and user p pairings；

   In the moment p ', the signal is sent to the user p and with the user of user p pairings on the same channel；

   Wherein, the user with user p pairings meets following condition：Signal quality is more than lowest demodulation thresholding.
2. 2. according to the method for claim 1, it is characterised in that according to the RSSI value, it is determined that in the moment p ' and institute The step of user for stating user p pairings, includes：

   From RSSI value of all users in the moment p ', the minimum user q of RSSI value is found out, determines the user q For the user matched with the user p.
3. 3. according to the method for claim 2, it is characterised in that after the minimum user q of RSSI value is found out, it is determined that described Before user q is the user matched with the user p, in addition to：

   The base station obtains RSSI values of the user q in moment q ', and the user p is in the RSSI value of the moment q ', its In, the moment q ' be the base station to the user q send signal at the time of；

   Judge whether the user p the moment p ' RSSI value and the user p the RSSI value of the moment q ' difference The thresholding that enters more than the user p, and, the user q is in the RSSI value of the moment q ' and the user q at the moment The difference of p ' RSSI value enters thresholding more than the user q's；

   When judged result is to be, it is the user with user p pairings to determine the user q.
4. 4. according to the method described in any one of claims 1 to 3, it is characterised in that in the moment p ', on the same channel to The step of user p and the user matched with the user p send the signal includes：

   Respectively by the user p and with the user p pairing user data figuration, obtain the user p and with the use The figuration data of the user of family p pairings；

   Merged by the user p and with the figuration data of the user of user p pairings；

   Figuration data after merging are sent in respective antenna.
5. 5. according to the method for claim 1, it is characterised in that according to the RSSI value, it is determined that the moment p ' with Before the step of user of the user p pairings, in addition to：

   Judge whether the user p has matched；

   If so, then obtaining the user p and with the user r that it is matched in the carrier wave of the moment p ' and interference and noise ratio CINR values；

   Judge whether CINR values of the user p in the moment p ' more than the user p exits thresholding, and the user Whether CINR values of the r in the moment p ' more than the user r exits thresholding；

   If judged result is to be, the user p and user r continue to match；Otherwise, user p and user the r separation of copulating moths, perform It is described according to the RSSI value, it is determined that the moment p ' and the user p pairing user the step of.
6. 6. according to the method for claim 5, it is characterised in that in the base station, at a time p ' is sent out to a user p During the number of delivering letters, all users are obtained in the base station before the step of RSSI value of the moment p ', in addition to：

   All users report respective RSSI value and CINR values at each moment in the base station.
7. 7. according to the method for claim 3, it is characterised in that also include：

   If not with the user p pairing user, the base station the moment p ' with common beamforming patterns to The user p sends the signal.
8. A kind of 8. base station, applied to beamforming system, it is characterised in that including：

   First acquisition module, at a time p ' to user p send signal when, obtain all users in the base station In the received signal strength RSSI value of the moment p '；

   Matching module, for according to the RSSI value, it is determined that in the user of the moment p ' and user p pairings；

   Sending module, in the moment p ', the user matched on the same channel to the user p and with the user p Send the signal；

   Wherein, the user with user p pairings meets following condition：Signal quality is more than lowest demodulation thresholding.
9. 9. base station according to claim 8, it is characterised in that the matching module includes：

   First matching module, the use minimum for from RSSI value of all users in the moment p ', finding out RSSI value Family q, it is the user with user p pairings to determine the user q.
10. 10. base station according to claim 9, it is characterised in that first matching module includes：

    Minimum value module, the user minimum for from RSSI value of all users in the moment p ', finding out RSSI value q；

    Second acquisition module, for obtaining RSSI values of the user q in moment q ', and the user p the moment q's ' RSSI value, wherein, the moment q ' be the base station to the user q send signal at the time of；

    First judge module, for judging whether RSSI value and the user ps of the user p in the moment p ' when described Enter thresholding of the difference more than the user p of q ' RSSI value is carved, and, RSSI values and institute of the user q in the moment q ' The difference that user q is stated in the RSSI value of the moment p ' enters thresholding more than the user q；

    Determining module, for when the judged result of first judge module is to be, determine the user q be and the use The user of family p pairings.
11. 11. base station according to claim 8, it is characterised in that also include：

    Second judge module, in the matching module according to the RSSI value, it is determined that in the moment p ' and the user p Before the user of pairing, judge whether the user p has matched；

    3rd acquisition module, if the judged result for second judge module is yes, obtain the user p and with its Carrier waves and interference and noise ratio CINR value of the user r of pairing in the moment p '；

    3rd judge module, for judging whether CINR values of the user p in the moment p ' is more than exiting for the user p Whether thresholding, and CINR values of the user r in the moment p ' more than the user r exit thresholding；If judged result It is to be, the user p and user r continue to match；Otherwise, user p and user the r separation of copulating moths, into the matching module.