WO2012083773A1

WO2012083773A1 - Method and device for controlling beam-forming

Info

Publication number: WO2012083773A1
Application number: PCT/CN2011/082391
Authority: WO
Inventors: 刘敏; 刘广
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-12-20
Filing date: 2011-11-18
Publication date: 2012-06-28
Also published as: CN102026387B; CN102026387A

Abstract

Provided is a method for controlling beam-forming. The method includes: acquiring a weight estimation resource of a system, acquiring the downlink traffic of a terminal and enabling or disabling beam-forming according to the weight estimation resource and the downlink traffic of the terminal. Also provided is a device for controlling beam-forming. The device includes an information acquisition unit and a judgment unit, wherein the information acquisition unit is configured to acquire a weight estimation resource of a system and the downlink traffic of a terminal; and the judgment unit is configured to enable or disable the beam-forming according to the weight estimation resource and the downlink traffic of the terminal. In the present invention, by selecting an appropriate terminal to enable BF, the BF gain is maximized, the utilization rate of the spectrum is improved, thus improving the throughput of the whole system.

Description

Beam forming control method and device

Technical field

The present invention relates to a communication system, and in particular, to a beam U-beam (BF-based) control method and apparatus.

Background technique

Beamforming is a multi-antenna transmission technology applied to small-pitch antenna arrays. Its main principle is to generate strong directional radiation patterns by using the strong correlation of spatial channels and the interference principle of waves, so that the main lobe of the radiation pattern Adaptively pointing to the user's incoming wave direction, thereby increasing the signal-to-noise ratio and increasing system capacity or coverage. As shown in Figure 1, beamforming is equivalent to forming a set of high-gain antenna arrays for each user to track it. Using the beam of the multi-antenna array to make the signal reach the strongest position at the user's location and the other position is the smallest. In order to achieve the effect of dry 4 especially inhibited.

The reason why an antenna is called a "smart antenna" is that the weight vector of the antenna array can control the pattern of the antenna array to form beams with different directions. The weighting factor can be optimally adjusted according to the adaptive algorithm to match the current transmission environment. The weighting factor is calculated as shown in Fig. 2.

Suppose there is a system with input data of weight . The output is:

y(t) = + ws ₂ H hw*5 _w = w ^H s(t) ,

Where w = , - _W „f, _S (t) = [5 ₁ , - 5„f , T represents transposition.

The carrier-to-interference-and-noise ratio (CINR), expressed in decibels (dBs), is a measure of signal quality. The carrier is a valid signal and the interference is either noise or co-channel interference or both. In order for the signal receiver to decode the signal, the signal must belong to an acceptable CINR range that is inconsistent depending on the technology used (e.g., CDMA, GSM, and wimax, etc.). The CINR is usually used to determine the current downlink modulation and coding scheme (DIUC). The higher the CINR, the higher the DIUC order that can be used, that is, the higher the coding rate, in other words, the higher the spectrum utilization.

Preamble refers to the preamble signal, and the system sends it to all terminals. The preamble obtained by all terminals is the same, so the CINR of the preamble area is not different because the function support capability of the terminal is different, only because the channel quality of the terminal is different. And different. Summary of the invention

It is an object of the present invention to provide a beamforming control method and apparatus for increasing system gain. In order to solve the above problem, the present invention provides a beamforming control method, including: acquiring a weight estimation resource of a system, and acquiring a downlink traffic of the terminal, and estimating, according to the weight, a downlink traffic of the resource and the terminal, enabling or stopping Beam shaping.

The step of estimating or stopping the beamforming according to the weight estimation resource and the terminal includes: in the terminal supporting the beamforming and not enabling the beamforming, if there is a terminal whose downlink traffic is greater than the first traffic threshold:

If there is currently no idle weight estimation resource, in the terminal that has enabled beamforming, the terminal whose downlink traffic is smaller than the second traffic threshold is selected, and the beamforming of the selected terminal is stopped, and the downlink traffic is greater than the first traffic. The terminal of the threshold enables beamforming, wherein the first traffic threshold is greater than the second traffic threshold; if there is currently an idle weight estimation resource, beamforming is enabled for the terminal whose downlink traffic is greater than the first traffic threshold.

The method further includes: acquiring a downlink channel quality parameter of the terminal;

The step of estimating or stopping the beamforming according to the weight estimation resource and the terminal includes: in the terminal that supports beamforming and does not enable beamforming, if the downlink traffic is greater than the first traffic threshold, and the downlink channel quality parameter A terminal that is smaller than the threshold of the first channel quality parameter, and currently has an idle weight estimation resource, is a terminal that enables the downlink traffic to be greater than the first traffic threshold and whose downlink channel quality parameter is smaller than the threshold of the first channel quality parameter.

The step of estimating or stopping the beamforming according to the weight estimation resource and the terminal includes: in the terminal that supports beamforming and does not enable beamforming, if the downlink traffic is greater than the first traffic threshold, and the downlink channel quality parameter If the terminal is less than the first channel quality parameter threshold, if there is no idle weight estimation resource, the downlink traffic is selected to be smaller than the second traffic threshold, and the downlink channel quality parameter is greater than the second channel quality. End of parameter threshold End, stopping the beamforming of the selected terminal, enabling beamforming for the terminal whose downlink traffic is greater than the first traffic threshold and the downlink channel quality parameter is smaller than the threshold of the first channel quality parameter, where the first traffic threshold is greater than The second traffic threshold is smaller than the second channel quality parameter threshold.

The downlink channel quality parameter is a carrier to interference and noise ratio (CINR) or an RSSI.

The method further includes:

When the terminal initially accesses, if the terminal supports beamforming and the system has an idle weight estimation resource, beamforming is enabled for the terminal.

The invention also provides a beamforming control device, comprising an information acquiring unit and a determining unit, wherein:

The information obtaining unit is configured to acquire a weight estimation resource of the system and a downlink traffic of the terminal; the determining unit is configured to enable or stop the beam U mode according to the weight estimation resource and the downlink traffic of the terminal.

The decision unit is configured to enable or disable beamforming by: in a terminal that supports beamforming and does not enable beamforming, if there is a terminal with a downstream traffic greater than the first traffic threshold:

The information acquiring unit is further configured to acquire a downlink channel quality parameter of the terminal;

The determining unit is configured to enable or disable beamforming by: in a terminal that supports beamforming and does not enable beamforming, if the downlink traffic is greater than the first traffic threshold, and the downlink channel quality parameter is less than the first A terminal with a channel quality parameter threshold, and currently having an idle weight estimation resource, is a terminal enabling beamforming in which the downlink traffic is greater than the first traffic threshold and the downlink channel quality parameter is smaller than the first channel quality parameter threshold. The information acquiring unit is further configured to acquire a downlink channel quality parameter of the terminal;

The determining unit is configured to enable or disable beamforming by: in a terminal that supports beamforming and does not enable beamforming, if the downlink traffic is greater than the first traffic threshold, and the downlink channel quality parameter is less than For a terminal with a channel quality parameter threshold, and there is currently no idle weight estimation resource, in the terminal that has enabled beamforming, the downlink traffic is selected to be smaller than the second traffic threshold, and the downlink channel quality parameter is greater than the second channel quality parameter threshold. The terminal, the beam shaping of the selected terminal is stopped, the beam shaping is enabled for the terminal whose downlink traffic is greater than the first traffic threshold and the downlink channel quality parameter is smaller than the threshold of the first channel quality parameter, where the first traffic threshold is greater than The second traffic threshold, the first channel quality parameter threshold is smaller than the second channel quality parameter threshold.

The apparatus also includes an initial control unit, wherein:

The initial control unit is configured to: when the terminal initially accesses, if the terminal supports beamforming and has idle weight estimation resources, beamforming is enabled for the terminal.

Since the uplink weight estimation resource is limited, in order to save the uplink bandwidth, the system user needs to perform BF beamforming screening, and the uplink weight estimation resource is used by the user who needs the beamforming most, so as to achieve the maximum gain of the system.

According to the present invention, when only a limited number of terminals can be enabled with BF, according to the channel condition of the terminal, the downlink traffic, and the gain of the BF, an appropriate terminal is selected to enable BF, the BF gain is maximized, and spectrum utilization is improved. , thereby increasing the throughput of the entire system. BRIEF abstract

Figure 1 is a schematic diagram of beamforming;

2 is a schematic diagram of generating a beam by a uniform linear antenna element;

Figure 3 shows the BF user traffic decision flow.

Preferred embodiment of the invention

The BF beamforming technique is a multi-antenna technique for performing downlink beamforming by uplink channel estimation. Therefore, it is necessary to rely on uplink resources and channel conditions for beamforming. Upstream channel estimation It is called the uplink weight estimation. Because the resources of the uplink weight estimation are limited, if all users use the downlink beamforming, most of the upstream bandwidth will be occupied. In addition, users with BF enabled can use DIUC orders higher than users without BF, that is, high spectrum utilization. In order to maximize system gain, users of BF need to be selected to allow users with high traffic. Enable BF to increase overall system throughput.

The present invention describes the use of terminal channel conditions, downlink traffic, base station resources, and BF gains for this terminal to determine whether the terminal should enable BF, in order to increase system throughput under certain circumstances, so that the BF gain is maximized.

The present invention provides a beamforming control method, including:

Obtaining the weight estimation resource of the system, the downlink traffic of the terminal, and estimating the downlink traffic of the resource and the terminal according to the weight to enable or stop beamforming.

Wherein, in a terminal that supports beamforming and does not enable beamforming, if there is a terminal whose downlink traffic is greater than the first traffic threshold:

If there is no idle weight estimation resource, the terminal that has the downlink traffic less than the second traffic threshold is selected in the terminal that has enabled the beamforming, and the beam shaping of the selected terminal is stopped, where the downlink traffic is greater than the first traffic threshold. The terminal enables beamforming, where the first traffic threshold is greater than the second traffic threshold;

If there is currently an idle weight estimation resource, beamforming is enabled for the terminal whose downlink traffic is greater than the first traffic threshold.

The downlink quality parameter of the terminal may also be obtained.

In a terminal that supports beamforming and does not enable beamforming, if there is a terminal whose downlink traffic is greater than the first traffic threshold and the downlink channel quality parameter is smaller than the first channel quality parameter threshold:

If there is currently an idle weight estimation resource, the terminal shaping is enabled for the terminal whose downlink traffic is greater than the first traffic threshold and whose downlink channel quality parameter is smaller than the first channel quality parameter threshold.

If there is currently no idle weight estimation resource, in the terminal that has enabled beamforming, the terminal whose downlink traffic is smaller than the second traffic threshold and whose downlink channel quality parameter is greater than the second channel quality parameter threshold is selected, and the selected terminal is stopped. Beam shaping, wherein the downlink traffic is greater than the first traffic threshold And the terminal with the downlink channel quality parameter being smaller than the threshold of the first channel quality parameter, wherein the first traffic threshold is greater than the second traffic threshold, and the first channel quality parameter threshold is smaller than the second channel quality parameter threshold.

The downlink channel quality parameter is a carrier to interference and noise ratio (CINR) or a received signal strength indication (RSSI).

Wherein, when the terminal initially accesses, if the terminal supports beamforming capability and has an idle weight estimation resource, beamforming is enabled for the terminal.

The downlink function of the present invention requires that the base station have at least four transmit antennas, and the number of users is at least one, and the user supports the BF function.

Set the BF enable list to record which terminals are enabled with BF at this stage;

Set up a list of users who support BF capability, and record which users have BF capability, that is, support BF. Alternatively, you can also set up a list of users that are supported and do not have BF enabled;

Periodically count the downstream traffic of the terminal.

The decision unit makes a decision on whether the terminal enables BF based on the above information.

The beamforming control method provided by the present invention includes:

1. When the terminal accesses, if the BF enable list has an idle location, and the terminal has the BF capability, the terminal is allocated an uplink weight estimation resource to start BF;

2. Periodically traversing the terminal queue supporting the BF-capable user list, selecting a terminal whose traffic is higher than N KB/s and whose signal quality parameter is lower than the threshold of the first signal quality parameter. If the terminal does not enable beamforming, then:

If the BF enable list has an idle location, assign the uplink weight estimation resource to the terminal, and start

BF;

If the BF enable list has no idle location, traverse the BF enable list to find a terminal culling BF enable list whose traffic is lower than M KB/s and whose signal quality parameter is higher than the second signal quality parameter threshold, and stop the weight estimation of the terminal And beam shaping, and the weight estimation resource is vacated for use by the selected terminal. Here N >M; The main reason for selecting high-traffic users to enter BF is that high-traffic low-level users have high spectrum occupancy rate and low spectrum utilization. In order to improve system throughput, priority is given to high-frequency spectrum occupancy, and terminals with low utilization rate enable BF. .

The selection terminal enabling BF method described in the present invention includes,

In the initial state:

Step 101: The terminal MS1 accesses the network.

Step 102: Determine the capability of the terminal MS1. If it is a terminal with BF capability, add the terminal MS1 to the list of users supporting the BF capability.

Step 103: Determine whether the BF enable list has a free bit, if yes, enable BF, if not, do not enable BF.

Of course, in the initial state, you can also disable BF and judge whether it is enabled in the subsequent running state.

The operation status is shown in Figure 3, and the specific steps are as follows:

Step 1: The base station periodically counts the downlink traffic of the terminal;

Step 2: Arrive at the BF user traffic algorithm decision cycle, and start traversing the BF-capable user list;

Step 3: Determine whether the BF-capable user list is empty. If not, select a terminal MS2 from the BF-capable user list to enter the decision process;

Step 4: determining whether the terminal MS2 has started beamforming, if it is exiting; if not, proceeding to step 5;

Step 5: The downlink traffic measured in the judgment period, if the downlink traffic in the terminal MS2 period is greater than N KB, and the downlink CINR (DLCINR) is less than the entry threshold of the D-th order of the modulation and coding mode, proceed to step 6 if the MS2 is in the downlink of the period. The traffic is less than or equal to N KB, or the DLCINR is less than the entry threshold of the D-th order of the modulation and coding mode, and exits;

Step 6: Determine whether the BF enable list has a free bit. If the terminal MS2 is placed in the BF enable list, enable BF to start the type, if not, go to step 7; Step 7: Determine whether there is a terminal whose traffic is less than M KB in the BF enable list, and the DLCINR of the terminal is higher than the entry threshold of the H-th order of the modulation and coding mode, if yes, go to step eight, if not, exit;

Step 8: The low-flow high-order user selected in step 7 stops the weight estimation, stops the beam shaping, and vacates an uplink weight estimation resource;

Step 9: assigning the uplink weight estimation resource to the terminal MS2, performing weight estimation and beamforming; Step 10, determining whether to traverse the BF-capable user list, if not, selecting the next terminal from the BF-capable user list, and returning Step four.

The determining unit is configured to enable or disable beamforming by: in a terminal that supports beamforming and does not enable beamforming, if there is a terminal whose downlink traffic is greater than the first traffic threshold:

The information acquiring unit is further configured to acquire a downlink channel quality parameter of the terminal; the determining unit is configured to enable or stop beamforming by: in a terminal that supports beamforming and does not enable beamforming, If there is a terminal whose downlink traffic is greater than the first traffic threshold and the downlink channel quality parameter is smaller than the threshold of the first channel quality parameter, and there is currently an idle weight estimation resource, the downlink traffic is greater than the first traffic threshold and the downlink channel quality parameter is A terminal less than the first channel quality parameter threshold enables beamforming. The information acquiring unit is further configured to acquire a downlink channel quality parameter of the terminal; the determining unit is configured to enable or stop beamforming by: in a terminal that supports beamforming and does not enable beamforming If there is a terminal whose downlink traffic is greater than the first traffic threshold and the downlink channel quality parameter is smaller than the threshold of the first channel quality parameter, and there is currently no idle weight estimation resource, then the downlink traffic is selected in the terminal that has enabled beamforming. The terminal that is smaller than the second traffic threshold and whose downlink channel quality parameter is greater than the second channel quality parameter threshold stops the beamforming of the selected terminal, where the downlink traffic is greater than the first traffic threshold and the downlink channel quality parameter is smaller than the first channel quality parameter. The terminal of the threshold enables beamforming, wherein the first traffic threshold is greater than the second traffic threshold, and the first channel quality parameter threshold is smaller than the second channel quality parameter threshold.

The downlink channel quality parameter is a carrier to interference and noise ratio (CINR) or an RSSI. Wherein, the device further includes an initial control unit,

The initial control unit is configured to enable beamforming for the terminal if the terminal supports beamforming and has idle weight estimation resources when the terminal initially accesses.

The above is only an example of the present invention, and is not intended to be applicable to such a scenario, and various modifications and changes can be made by those skilled in the art, and the scope of the present invention should be Prevail.

Industrial applicability

Compared with the prior art, the present invention selects an appropriate terminal to enable BF according to the channel condition of the terminal, the downlink traffic, and the gain of the BF, and maximizes the BF gain, in the case that only a limited number of terminals can be enabled with BF. , improve spectrum utilization, thereby increasing the throughput of the entire system.

Claims

Claim

1. A beamforming control method, comprising:

Obtaining a weight estimation resource of the system, and acquiring downlink traffic of the terminal, and estimating, according to the weight, the downlink traffic of the resource and the terminal to enable or stop beamforming.

2. The method of claim 1 wherein

3. The method according to claim 1, further comprising: obtaining a downlink channel quality parameter of the terminal; and estimating, by the weight, the downlink traffic of the resource and the terminal, the step of enabling or stopping beamforming comprises: supporting beamforming and not enabling In the beam-formed terminal, if there is a terminal whose downlink traffic is greater than the first traffic threshold and the downlink channel quality parameter is smaller than the threshold of the first channel quality parameter, and there is currently an idle weight estimation resource, the downlink traffic is greater than the first The terminal with the traffic threshold and the downlink channel quality parameter being smaller than the threshold of the first channel quality parameter enables beamforming.

4. The method of claim 1 ,

The method further includes: obtaining a downlink channel quality parameter of the terminal;

The method according to claim 3 or 4, wherein the downlink channel quality parameter is a carrier interference to noise ratio (CINR) or a received signal strength indicator (RSSI).

6. The method of any one of claims 1 to 4, further comprising:

A beamforming control device, comprising: an information acquiring unit and a determining unit, wherein: the information acquiring unit is configured to acquire a weight estimation resource of the system and a downlink traffic of the terminal; the determining unit is configured to be according to the right The value estimates the downstream traffic of the resource and the terminal to enable or stop the beam U type.

8. The apparatus according to claim 7, wherein

The decision unit is arranged to enable or disable beamforming by:

In a terminal that supports beamforming and does not enable beamforming, if there is a terminal whose downstream traffic is greater than the first traffic threshold:

9. The apparatus according to claim 7, wherein

The decision unit is configured to enable or disable beamforming by: in a terminal that supports beamforming and does not enable beamforming, if there is downlink traffic greater than the first traffic threshold and If the channel quality parameter is smaller than the threshold of the first channel quality parameter threshold, and the current weight estimation resource is available, the terminal enabled beam is lower than the first traffic threshold and the downlink channel quality parameter is smaller than the first channel quality parameter threshold. Forming.

10. The apparatus according to claim 7, wherein

The determining unit is configured to enable or disable beamforming by: in a terminal supporting beamforming and not enabling beamforming, if there is downlink traffic greater than the first traffic threshold and the downlink channel quality parameter is less than the first channel a terminal having a quality parameter threshold, and currently no idle weight estimation resource, in the terminal that has enabled beamforming, selecting a terminal whose downlink traffic is smaller than the second traffic threshold and whose downlink channel quality parameter is greater than the second channel quality parameter threshold, Stopping the beamforming of the selected terminal, enabling beamforming for the terminal whose downlink traffic is greater than the first traffic threshold and the downlink channel quality parameter is smaller than the threshold of the first channel quality parameter, where the first traffic threshold is greater than the second traffic The threshold, the first channel quality parameter threshold is smaller than the second channel quality parameter threshold.

The apparatus according to claim 9 or 10, wherein the downlink channel quality parameter is a carrier interference to noise ratio (CINR) or a received signal strength indicator (RSSI).

12. The apparatus according to any one of claims 7 to 10, further comprising an initial control unit, the initial control unit being configured to: when the terminal initially accesses, if the terminal supports beamforming and has idle weights Estimating the resource, then enabling beamforming for the terminal.