Automatic power control for mobile radio systems

 

(57) Abstract:

Elementary mobile radio system, in which the applied power control and in which measure the relative path attenuation relations between the base station and mobile are used to calculate the stability conditions. In this system, the mobile stations are adapted to transmit the total known sequence (call) at various times, and the base station are adapted in accordance with this sequence in the entire period of transmission to measure the levels of the signals from all mobile stations within a range that is a technical result. The base station stores the levels and the time of reception. Data is collected via a network connecting base stations to a common point. This common point estimates of the times of the peaks of the signal are unknown mobile stations are compared with those detected by other base stations to identify a mobile station associated with each correlation peak. 4 C.p. f-crystals, 3 ill.

The invention relates to mobile radio systems and in more detail relates to automatic power control for use in them.

The term mobile for the sake of the many portable, transportable or movable radioiodines.

It is shown that in elementary mobile radio systems, you can get better system performance through the use of automatic power control of the transmitting mobile stations (here referred to for simplicity as "power control"). It reduces the transmission power to an absolute minimum, in order to obtain an acceptable communication. The minimum power for a given mobile station has a function as characteristics of its radio lines, and interference at the base station with which a link is maintained.

Known system power control using the control connection of the power supply, which has a rated capacity the most appropriate way to signal from the base station to the mobile stations the ability of the mobile stations to set the correct power level. This system will work well, supporting a large number of users, if it does not exceed the maximum system performance at any given time. However, when this capacity is exceeded, there comes a mechanism of instability in all systems of power control.

This mechanism occurs, as will be described di at least two movable, one of which is operatively associated with each of the base stations on the same or similar frequency channel on which the base station receives signals from two or more mobile stations. Thus, the required signal from one mobile station is added to at least one signal received from another mobile station, which is perceived as noise.

The purpose of this invention to provide automatic power control, in which the above disadvantage is eliminated or at least alleviated.

According to the present invention, the automatic power control for mobile radio systems contains the control center, through which the associated set of base stations to facilitate mutual communication between the mobile stations that have access to the system via the base station, the mobile station is prepared for transfer, in addition to the identification code, unique for each mobile unit, we have a sequence of data common to each mobile station, but passed each fixed station in nominally different times within each turn, each base station including means cor is odigie station recognize with its identifying code), and, mixing the signals from the mobile station to the neighboring base stations, a data storage device used for storing the correlation results, where the details of the relevant power levels and times of the reception is recorded, if they belong to the accepted signals, the control center having a signal processor corresponding to the drive data for each base station to identify the mobile stations involved in a potential situation of mutual interference, and transmits instructions to the base stations by controlling the power transmitted to mobile stations.

While the control center is in possession of data belonging to the signals accepted by the base stations from the mobile stations associated with the base, and which may be mutual interference, as noted when comparing power levels and the corresponding times of measurement of the power control can be effective in eliminating or at least minimizing mutual interference.

The sequence data may be random in time and is associated with the base station by the mobile station, which is supported by the link.

The sequence data can be PS is movable, with which they are associated.

In this system, the scheme of collision avoidance can be enforced, because the base station instructs one or more movable, moving, if there is concern about potential mutual interference.

In the scheme of obstacle avoidance can be used in the system of updating the data, because the data is corrupted mutual interference are identified and replaced with the correct from the previous turn.

In Fig. 1 shows a schematic diagram illustrating conditions of instability; Fig. 2 is a graph showing the signal flow between the mobile stations associated with different base stations; Fig. 3 is a block diagram of a system provided by the invention.

Referring to Fig. 1 to 3, the existing control system, power can use the control connection of the power supply, in which the required power is installed in the most appropriate manner, namely: transmitting a signal from the base station to the mobile and thereby giving her the opportunity to set the correct power level. This system will work well, providing a large number of active users, not exceeding dopustivosti in all systems of power control. This can best be understood in terms of exactly two base stations and two mobile stations, where one mobile-connected to one base station and another mobile connected to another base station, as shown in Fig. 1.

The mobile station 0 is attached to the base station 0 and the mobile station 1 to the base station 1. Lej way to achieve (the opposite value of the path loss from the mobile station connected to the base station l to the base station j. It is easy to show that if both base stations require that the signal-to-interference was equal to R, then the power will increase to the maximum value, if

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Qualitatively, this condition appears when it is possible to satisfy both of the mobile stations at the same time.

Consider the case where the mobile station 0 is activated and the mobile station 1 requires access. The previous equation provides a means of checking whether to accept the requirement of the mobile station 1. If the left side of the equation is less than one, then you should make it. However, performing this check requires knowledge of all values Lej.

In more realistic scenarios, containing many moving and bazovoe knowledge of all essential Lej for each mobile station. In fact you want a more General variable called Lemj, which indicates the path of achievement m /s/ mobile station connected to the base station l base station j. For mobile station m, is connected to base station j, the ratio Lemj/Leme prevents the connection between the base stations l and j that are connected to this mobile station.

The sense of this invention to provide a practical means to perform these measurements and take appropriate action depending on the results, in order to avoid instability under the action of mutual interference.

It is desirable at all times for active mobile stations to have the new values Lemj. The system may become unstable, or if a new mobile station with a large number of intersecting links activated, or one or more existing active stations will move to new locations so that unacceptably increase the number of concurrent connections.

So, obviously, requires regular measurements for the active mobile stations, and measurement quantities for new mobile stations to check whether the connection.

Each active mobile standalone assumption, that data is transferred in discrete portions, and these portions contain a sequence of known data for synchronization purposes, the estimated channel and the other the Receiver at the base station, the corresponding special mobile station will perform a correlation on the known data sequence to perform the necessary time, and channel estimation. The correlation value provides an assessment of the power received from the given mobile station. So, for power transmission Mem mobile station we can easily get the appropriate dimension Leme from the mobile station m to the base l (later we will see that there is no need to get the value of Mem. If the base stations surrounding the base station l is done in correlation to known sequence transmitted by the mobile station m, they can also estimate the strength of the received signal from the measured peak correlation. Next, the value of Mem may allow definition Lemj for j base station. However, since we only need the value Lemj/Leme, there is no need to define Mem.

While the approach described above is in principle possible, it may not be too attractive, requiring at each base starlito not only requires more equipment, but a significant vehicle in the network connecting the base station to inform those who were appointed by the correlator.

An important feature of this invention is the requirement that all mobile stations transmit the same sequence data, but at different points in time within the inclusion. Each base station needs only one fast correlator, which will produce a measurement of the peak correlation for all mobile stations with significant interference energy.

The peak corresponding to any mobile stations associated with a special base station, will be determined by the base station, their means of which the peak was detected. From this point of view, each base station is capable of receiving the measurement of the received power for many mobile stations, but to determine the identity of only those mobile stations that are connected through it. This information, however, can be obtained through a comparison of the times of the peaks of the correlation, when information is collected in the center of the switch, as shown in Fig. 1.

According Fig. 2, each base station (0 to 3) has only one active mobile station. Mobile stations pertective with these known data. For each base station, there is one mobile station with a known identifier, which enables the base station to recognize your own unique mobile. For mobile stations associated with other base stations, all that is known is the signal strength and reception. This is illustrated by the display of each station. All this information is sent through the network that connects the base station with the control center switch. This control switch may be on one of the base stations or may be a special center switch. The information sent to the control center, contains the time at which each of the signal peaks, the magnitude of the signal peaks and the identity of known signals that specifically illustrated in the image below each base station.

In the control center, or more precisely collect various data sources are aligned in time using an absolute time measurement, or by using a sample, marking the peak. It is easy to understand how knowledge in one base station identity of the peak of the mobile station can be used to determine the identity of the peaks corresponding to the same podvizhnogo identity received from the other side of the base station (vertical arrows show the flow of information). Receiving identities once allows you to calculate all relations using the measurements.

When you activate a new mobile station, its parameters must be measured. This is required because the data transfer using the mobile station is accompanied by the danger of instability. New mobile station evaluates the appropriate power required for transmission (by measuring transmission loss), and sends a portion of the known signal sequence, but without data. Thus, if a new mobile station cannot be accepted in the network, only a small impulse may occur. Ideally, any errors that are generated when receiving from an active mobile station when transmitting a known sequence of a new mobile station, can be adjusted in the future. The capacity of the new mobile station is not controlled by the transfer of the known sequence. The mobile station may use the identifier to its host base station for connection so that she could recognize, does the new mobile station attach to the base station. Since the parameters for the new station were obtained, a stability test may be Prov is based sequence may be random, pseudo-random or coordinated.

In case of accidental time the mobile station receives a random decision, at what point in the transfer of data to place a known sequence. It relies on the base station to recognize a specific identifier of the mobile station. Here, the identifier is required to have a data decryption at the exact location in the data portion, which includes a known sequence so that the data can be correctly transferred. This is a random location can be obtained as frequently or infrequently as the system will require definition. Maximum speed on one portion of the data.

In the case of a pseudo-random time the mobile station selects, apparently, randomly place to include known data sequences. In this case, there is no need for the mobile station to inform the base station about the location, because it is able to determine its own local version of a pseudo-random location generator. The transmission rate in this approximation has the same flexibility as in the previous case.

In the case of coordinated universal time, each base station uses iLounge, to separate the peaks.

No matter which of the presented schemes is used, the possibility of collision between the peaks should be relatively low. Especially the peaks must have a low capacity allocation is less than the differential permeability, which is delayed indefinitely. This occurs for two reasons.

First, various maps of time generated by each base station can have an indefinite time window around each correlation peak, dependent on uncertain delay patency. Peaks can appear at different times in these Windows for different base stations. If only peaks for different mobile stations are not separated and at least across the width of the window, ambiguity can result in the perception of the identity of the mobile station.

Secondly, since this invention is used in elementary systems with large velocity dispersion, or known sequence, or data, or both (direct spectrum spreading sequence), it may therefore be a significant delay spread in many ways. The measurement of signal power can the straps inadequately, the peaks from the two mobile stations can be combined as one.

Schema random or pseudo-random arrangement is preferable on the grounds of simplicity. If the random location is used, it is possible to adjust system settings so that it is very unlikely that transfer from special mobile stations contained in the overlay of two good servings transmission. The overlay can be easily detected because they will appear as only two base stations are taking their mobile stations, because the portion of the known sequence with a time separation less than the window indefinite delay. In this case, can be used parameter values obtained previously.

Let us consider Fig. 3, which illustrates the architecture for the four base stations connected to a common control center 4 (switching center of the mobile stations). Each of the stations 1, 2, 3 modifies the signal and performs normal processing applied to basic communications of the mobile stations in the label 5, which should be well known to those well versed in the technique. In addition, it performs the function of the correlator 6 known sequence identifier signal in the correlator 6. Once known sequence reaches a threshold correlation starts to work, the ID signal 7. If the identification sequence to the mobile station found the known sequence (as in this example), it is assumed that the mobile station refers to a base station and its data is processed. Note that the block 5, called "RF processing and main processing of communication", and contains memory that is capable of receiving the modified data received before the receiver of known sequence and identifier. Moreover, in order to identify the peak, other unidentifiable peaks must be detected. The amplitude and the time of reception is transmitted to the drive 8 for each base station. At the end of each transmission data stored on the drive each station are forwarded to the control center 4 from all base stations 1, 2, 3.

The control centre 4 consists of the following series-connected blocks of the data block alignment at time 9, the block cross-identification 10, block 11 to calculate the factor of Association of the intersections and the unit 12 that calculates the resistance. Unit 9 aligns the data by time, or by using AB the set of technical documents for comparison, the peak time for different data from different base stations.

Further, known inditification is made in block 10, for unknown uses temporal comparison. Finally, the factors connecting the intersection and the calculation of stability are produced in blocks 11 and 12. This information is transmitted to the corresponding base station 1, 2, 3 as required through line 13, 14 and 15, respectively.

It should be recognized that it is possible to make various modifications with a special device described above, without derogating from the field of action of the invention, as it is easy to see upon closer examination.

1. Automatic power control for mobile radio systems containing multiple base stations, mobile stations that have access to the system via the base station, the mobile stations are adapted to transmit and is equipped with an ID code that is unique for each mobile station, to recognize them with their identifying code, wherein a control center through which is connected a set of base stations to facilitate General communication between mobile stations, each mobile station is arranged to transmit a sequence of data that is common to each mobile station, but given the correlation detection signals from different mobile stations, inside the own base station by mixing signals from the mobile stations, and the storage device intended for storage of results of correlation so that the particular relative power levels and times of the reception is recorded in case they belong to the accepted signals, the control center is equipped with a signal processor corresponding to the drive data of each base station, intended to identify the mobile stations involved in a potential situation of mutual interference, and to transmit appropriate instructions to the base stations connected to it by suitable control signals to the power transmitted to these mobile stations.

2. The system under item 1, characterized in that the random sequence of data in time and transmitted to the base station by the mobile station with which it is associated.

3. The system under item 1, characterized in that the pseudo-random sequence of data in time and fixed in space and known as the base station and mobile station with which it is connected.

4. System according to any one of paragraphs. 1 to 3, characterized in that it is equipped with a circuit for preventing collisions intended dzielna the problem of mutual interference.

5. The system under item 4, characterized in that it is equipped with a system replacement data designed to detect invalid mutual interference data and replace them correctly taken from the previous packet transmission.

 

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