Method and communication system for regulating power between a base station and a subscriber station

 

The invention relates to the field of radio communications. According to the invention in a first station take the second transfer station and determine Executive command for the transmission power of the second radio station. The Executive team at the next transmission of the first radio station transmits to the second station, after which it takes into account the Executive team in one of their next transmission to adjust the transmit power. In contrast to the prior art when changing the transmission power used is not time invariant and constant values of the step, and the Executive team, which is assigned to the variable step size settings transmit power. The variable step size is configured by the radio stations, depending on the subscriber and depending on time. The technical result consists in increasing behaviour during transmission. 3 N. and 11 C.p. f-crystals, 11 ill.

The invention relates to a method and communication system for regulating power between a base station and a subscriber station, in particular for transmission of CDMA (Code Division Multiple Access=multiple access, code-division multiplexing) in a broadband transmission channels.

In sist lectromagnetic waves through the air. The air refers to the connection between the base station and subscriber stations, and subscriber stations may be mobile or stationary radio stations. This radiation of electromagnetic waves is carrier frequency, which are provided for the respective system bandwidth. For communications systems of the future, for example, UMTS (Universal Mobile Telecommunication System=Universal mobile telecommunications system) or other systems of the third generation is provided by frequency in the frequency range of 2000 MHz.

For the third generation mobile radio provides shirokopolosnye (=5 MHz) radio interfaces that use a transfer method cdma (Code Division Multiple Access=multiple access, code-division multiplexing) to separate the different transmission channels. For CDMA transmission method is necessary to ensure constant power control of the transmission, which operates in the form of a closed loop, as a rule, for both directions of transmission. For the direction up (radio transmission from the mobile station to the base station), the base station estimates the transmission of the mobile station relative to the quality of the transmission and sends back to the mobile station Executive CZK. From the publication (ETSI=European Institute of standardization for telecommunications) ETSI STC SMG2 UMTS-L1, Tdoc SMG2 UMTS-L1 221/98 from 25.8.1998, pages 29-30 is known, set to increase or decrease the transmission power constant step size, which can only be changed from one radiosity to another. That is, the step size correction power transmission is a static parameter. Static task step value, however, ignores certain dynamic behavior properties for transmission via the radio interface, which when too high transmit power temporarily causes unnecessary high mutual interference in the communication system or, respectively, with very low power transmission too bad transmission quality.

The objective of the invention is to improve the behaviour during transmission. This task regarding fashion is solved by the characteristics of paragraph 1 of the claims and the radio system characteristics item 16 claims. A preferred form of the further development follow from the dependent claims.

According to the invention in a first station take the second transfer station and determine Executive command for the transmission power of the second radio station. ISOE is it takes into account the Executive team in one of their subsequent transmission to adjust the transmit power. In contrast to the prior art in broadband transmission CDMA when changing the transmission power used is not time invariant and constant step value, and the Executive team, which is assigned to the variable step size settings transmit power. A variable step size set by the stations based on the subscriber and depending on the time.

The larger the step size, the faster the correction of incorrect settings transmit power, of course, due to inaccurate regulation. With a small step size control is more precise, however, and the delay to the correction of strong deviations more. Due to the variable step regulation can be agreed with all terms and conditions of transmission depending on the subscriber and depending on time and thereby the regulation can be improved. Improved regulation causes less interference and guaranteed for all connections the transmission quality.

According to a preferred form of the further development of the invention on the radio with repetition over time to assess the condition of transmission for the connection and changes the state of the transmission increase or reduce the amount meenie control loop to adjust the transmission power:

break continuous transfer mode for measuring purposes (quantized mode)

- change the asymmetry of the use of radio resources of the radio interface in the TDD mode (time division duplex=duplex with split time between the up and down directions,

- the speed of movement of the subscriber station,

the amount used of the transmitting and/or receiving antennas,

temporal length of the average signal at the receiving side,

the length used for detection of the signal response of the channel impulse effect,

- the number of base stations that are in radio contact with the subscriber station in the way macronutrient transfer.

By changing these conditions, the transmission of the control loop at a certain time is interrupted or changed the break time or dramatically change the quality of the detection of the transmitted information. It can better respond due to variable step.

Method of control is particularly suitable for radio interfaces, which use the method of separation of CDMA subscribers in the broadband transmission channels, in which there are many possible States of the transmission, changing the control loop. mode split time time division duplex (TDD) mobile radio systems of the third generation. The regulation applies to the direction up and down so that the first radio station is either a base station or a subscriber station.

What are the step value should be applied, it follows from alarm, coded implicitly transmitted within the Executive team or in accordance with the correlation table linking the various States of the transmission is subject to enforcement by the step size, or settlement instructions. You can also use combinations of these events. For any modifications of the transmission which tasks are best of examples.

Examples of carrying out the invention are explained in more detail using the figures, which show:

Fig.1 is a schematic diagram of a wireless system; Fig.2 - set the step value in the "quantized mode; Fig.3 - set the step value for different ratios of asymmetry; Fig.4 - define the size of the step at different speeds of the mobile station; Fig.5 - set values step using receive diversity; Fig.6 - setting value of the step in the application of the method is extremely fast switching mobile station, and Fig.7 is a control loop to adjust the transmit power.

Predstavlenno switching MSC, connected to the network or, respectively, create the access to the fixed telephone network PSTN. Furthermore, these mobile switching centers MSC are connected respectively at least one device RNM for the allocation of radio resources. Each of these devices RNM in turn allows the connection of at least one base station BS.

Such a base station BS is a radio that can be set via an air interface connection with the subscriber stations, such as mobile stations MS or other stationary and mobile terminal devices. Each base station BS is formed at least one radiata. In Fig.1 shows the connection V for the transmission of useful information between the base station BS and the mobile station MS. The regulation of the transmission power of the radio connection through the radio interface is explained later, and is shown only to adjust the transmission power of the mobile station MS. For opposite directions of transmission are applicable equivalent measures.

Operational and maintenance center OMC implements control functions and maintenance functions for the mobile riistama radio which may relate to the application of the invention, in particular for subscriber access networks with radiopollution to the subscriber.

Power control of the transmission is shown for the radio in the upward direction UL. Transmission TX mobile station MS transmits information in the upward direction UL, and to adjust transmit power to account Executive team TRS. This Executive team TRS occurs due to the fact that the base station BS means receiving RX take transfer of the mobile station MS and the control means Mrs determine Executive team TRS, which is then transmitted in a downward direction DL to the mobile station MS.

The transmit power of the mobile station MS when this change is not arbitrary, and step through. If the mobile station MS is still transmitted with transmission power Px, by controlling the transmit power the transmit power for the next transmission, or increase or decrease. If you receive an error during transmission, the transmit power save. Due to alarm the Executive team TRS from the base station BS to the mobile station MS to report which of the three cases occurs. The increase or decrease occurs, however, only led the program this value stepTRS is a dependent of the subscriber and from time to time.

To set the step size ofTRS, which together with the Executive team TRS and the previous transmit power gives an unambiguous instruction to adjust the transmit power, you can use three methods.

Method 1:

Signal also want to use a step sizeTRS. Until then, until there is a warning about changing the step size ofTRS retain the current step sizeTRS. The speed with which it can be re-configured value stepTRS, thus depends on the capabilities of the alarm.

Method 2:

Actually want to use the step valueTRS is contained implicitly in the Executive team TRS by a corresponding encoding. As shown in ETSI STC SMG2 UMTS-L1, Tdoc SMG2 UMTS-L1 221/98 from 25.8.1998, pages 29-30, according to the prior art Executive team, which requires only one bit (output+(high) or capacity (reduced)), encode two bits. Additional alarm value stepTRS can be made or due to the fact that signal 3:

Subject to application of the step sizeTRS is rigidly associated with certain events or modes of transmission, which denote in the following as a condition of transfer. The connection between the communication state and the step sizeTRS stored in the lookup table, which is required for both stations MS, BS.

In the following explains the setting value stepTRS in some States of the transmission, which caused still unsatisfactory characteristic regulation for power transmission.

"quantized mode."

The so-called "quantized mode in full duplex mode with frequency division FDD (frequency division duplex), look with regard to him ETSI STC SMG2 UMTS-L1, Tdoc SMG2 UMTS-L1 221/98 from 25.8.1998, pages 33-34, describes a break in the transmission, which otherwise is continuous, for measuring purposes, for example, to prepare the transmission of the mobile station MS to the other base station BS. A break can be made in the direction of up or down. During the time of the break loop is not effective so that when transmission resumes configured to also transmit power is often very different from the Opti is Menno increase. While preferred, the increase is greater, the longer it lasted a break.

According Fig.2A generally fair value stepTRS 0.5 dB, which at the interval of 5 MS for the three channel intervals increase to 1.5 dB, or when the interruption 10 MS increase to 2.0 dB, until again will operateTRS=0.5 dB. It is hard-coded according to method 1, and thus is known as the mobile station MS and base station BS.

An alternative to that according to Fig.2b in alarm, warning about the "quantized" mode, the signal can be also subject then use the step sizeTRS. The step size can then be configured depending on the duration of the interruption. The duration of the modified step size ofTRS is either pre-determined, for example, three channel interval, or contained in alarm. Another possibility is shown in Fig.2C, and for the time in three channel interval or for the rest of the cycle time used the extended TRS-encoding, then there is an implicit transfer step size ofTRS together with the Executive is p>

Duplex mode time-shared time division duplex (TDD) may assign timeslots cycle in the frequency band on the choice of the direction up or down. Thus, in accordance with the need, you can allocate bandwidth transmission direction up or down to well to support asymmetric services with the optimal use of resources. Asymmetry of exchange but has influence on the control loop for power transmission. In contrast to the FDD mode, due to the overall bandwidth for the directions up and down, there is no way to plan for anticipated delays in signaling the Executive team TRS. The greater the asymmetry, the less is the ability of the control loop to track the rapid changes of the transmission conditions.

The step sizeTRS hence, depending on the asymmetry. When a large asymmetry according to Fig.3 specify a greater value stepTRS, with less than asymmetry, in order to accelerate the adjustment of transmission power. With less asymmetry value stepTRS less, to improve the control accuracy. According Fig.3 should be before the t to occur only through the large time intervals and in each case is related to that alarm.

The speed of the mobile station.

The so-called "fast fading" describes changes to the transmission conditions of the radio interface and increasing performance with increasing speed of the mobile station MS. Since fast power control of the transmission also operates with temporarily constant step sizeTRS, the efficiency of the large step size ofTRS again decreases with increasing speed of the mobile station MS. Therefore, according to Fig.4 both at small and at large velocities ask a small step sizeTRS, for example, 0.5 dB, and at medium speeds, prefer a large step sizeTRS, for example, 1 dB. At low speeds, the accuracy of controlling the transmit power is good, and at an average speed in the foreground is fast tracking the transmit power to compensate for the attenuation. To set the step size ofTRS preferably use method 1, i.e. the alarm value stepTRS base station BS to the mobile station MS, as the speed of the mobile station MS is estimated at the base station BS.

Winning explode/change attenuation

power. Therefore, each winning explode reduces the variability of the received power. Therefore, it is possible to reduce the step sizeTRS is greater, the greater you receive the winnings explode. Winning explode increases with

- increasing the amount of echo in the reaction channel impulse effect,

- increasing the number of independent transmitting and receiving antennas,

- increasing the time length of the averaging, due to the extension or alternation (interleaving).

These measures compared to the shipment of the Executive team TRS produce more rarely so, what should I prefer method 1 (alarm). Fig.5 gives an example of using different number of receiving antennas. If you use more than one receiving antenna, that is the antenna receive diversity. If the reception side uses more than one antenna, you can work on the side of the transmission with a smaller step sizeTRS. The step sizeTRS reduce by signaling, for example, of 0.25 dB.

"Extremely fast switching".

The so-called extremely fast switching describes the condition of the transmission, when cataromance with at least another base station BS. During the extremely fast switching, as in the upward direction and the downward direction information of the mobile station MS will be accepted more than one base station BS or, respectively, the information is transmitted more than one base station BS. Responsible for the mobile station MS base station BS included in the active set (active set). Thus in the direction of up and down every time the base station was included in the active set or has been seized from him, the result is an abrupt change of winning macronutrient transmission and total transmission power in a downward direction. Adjusting the transmit power should follow it possible quickly.

When extending the active set should be possible to quickly reduce the transmit power in order not to overload the system without mutual interference. When reducing the active set would quickly increase the transmission power, in order to ensure sufficient signal quality. In both cases, the step sizeTRS temporarily increase. Preferred is when the extension of the active set to increase the step sizeTRS only in the direction hr/916.gif">TRS only in the direction of increasing transmit power (+TRS). Changing the step size ofTRS in the downward direction may be greater as this along with winning explode it also changes the total transmit power.

According Fig.6A, 6b and 6C can use all three methods, with increasing step size ofTRS is effective only for a limited time period, for example, for a two channel intervals or rest cycle. After that, there should again be applied possible fine adjustment of the transmission power with a small step sizeTRS.

Because the extension or reduction of the active set is signaled by the base station BS, thereby it is possible at the expense of jobs to choose a step sizeTRS for the mobile station MS according to the lookup table, see Fig.6A. The alternative according to Fig.6b is possible to make the alarm changes or according to Fig.6C to improve the setting of the transmission power by changing the encoding of the Executive team TRS.

According Fig.7 regulation of the transmission power for transmission in the upward direction can simplistically be described as follows.

After ustme transmission TX mobile station MS produce the transmission in the upward direction UL. These transmission means take admission RX base station BS. Then the control means IFAS ask, have you changed the time of the transfer. If Yes, then re-define the step sizeTRS, otherwise keep the step sizeTRS configured to the beginning of the connection. Next, the control means Mrs determine Executive team TRS so that the Executive team in a downward direction DL can be transmitted by means of transmission TX base station BS to the mobile station MS.

The mobile station MS receives the Executive team TRS and insists respectively for subsequent transmissions to transmit power, and simultaneously take into account the step sizeTRS. The step sizeTRS or contained by method 2 in the Executive team TRS, or was signaled by the method 1 or method 3 could be reconstructed by the mobile station MS from the previous transfer status.

Claims

1. The method of power control in the system of radio communication with the radio interface between the first and second radio station, wherein the first radio stations accept per the Executive team at any subsequent transmission of the first radio station transmits to the second radio station, the second radio station account Executive team in one of their subsequent transmission to adjust the transmission power, the Executive team refers to the variable step size tuning transmit power, which set up radio stations depending on the communication status and depending on the time and radio stations with a repetition time control of the transmission status between the stations, wherein the transmission status is the interruption of transmission for measuring purposes and after the break temporarily increase a variable step size settings transmit power.

2. The method according to p. 1, characterized in that a means of increasing variable step of setting the transmission power is dependent on the length of the break.

3. The method of power control in the system of radio communication with the radio interface between the first and second radio station, wherein the first radio station take the second transfer station and determine Executive command for the transmission power of the second radio station, the Executive team at any subsequent transmission of the first radio station transmits to the second radio, the second radio station account Executive team in odnoy the step size tuning transmit power, which regulate radio stations depending on the communication status and depending on time, at the stations with a repetition time control of the transmission status between radio stations and the transmission status is the speed of the first or second radio station, wherein the variable step size adjust the transmission power in the middle speed range is greater than in the high speed range.

4. The method according to p. 3, wherein the variable step size adjust the transmission power in the middle speed range is also greater than in the lower speed range.

5. The method of power control in the system of radio communication with the radio interface between the first and second stations, wherein the first radio station take the second transfer station and determine Executive command for the transmission power of the second radio station, the Executive team at any subsequent transmission of the first radio station transmits to the second radio, the second radio station account Executive team in one of their subsequent transmission to adjust the transmission power, the Executive team refers to the variable step size settings modest radio with repetition time control of the transmission status between radio stations, characterized in that the transmission status is the amount used for one connection of the transmitting and/or receiving antennas, and when you change the number used for the connection of the transmitting and/or receiving antennas change a variable step size settings transmit power.

6. The method according to p. 5, characterized in that the change in the number used for the connection of the transmitting and/or receiving antennas are produced by changing the number of base stations that are in radio contact with the subscriber station in the way macronutrient transfer.

7. The method according to p. 6, characterized in that increasing the number of base stations that are in radio contact with the subscriber station, a variable step size adjust the transmission power increase only for lowering the transmission power.

8. The method according to p. 6, characterized in that reducing the number of base stations that are in radio contact with the subscriber station, a variable step size adjust the transmission power increase only increases the transmission power.

9. The method according to any of the preceding paragraphs, characterized in that for use of the radio interface transmission method in CDMA broadband channels front of the station, and the second radio station is a subscriber station.

11. The method according to any of paragraphs.1-9, characterized in that the first station is a subscriber station and the second station is a base station.

12. The method according to any of the preceding paragraphs, characterized in that you want to use a variable step size settings transmit power signal.

13. The method according to any of paragraphs.1-11, characterized in that you want to use a variable step size settings transmit power set transmitted through the Executive team.

14. The method according to any of paragraphs.1-11, characterized in that you want to use a variable step size settings transmit power set according linking various transmission condition to be applied with variable step size settings transmit power table of compliance or settlement instructions.

 

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SUBSTANCE: proposed method intended for single-ended radio communications between mobile objects whose routes have common initial center involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from mobile object, these intermediate transceiving drop stations being produced in advance on mentioned mobile objects and destroyed upon completion of radio communications. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in joint functioning of several radio communication systems.

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FIELD: radio communications.

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EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 6 dwg, 1 tbl

FIELD: radio communications.

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EFFECT: reduced mass and size, enhanced noise immunity and electromagnetic safety for attending personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications.

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2 cl, 7 dwg, 1 tbl

FIELD: radio communications.

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EFFECT: reduced mass and size, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 7 dwg, 1 tbl

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EFFECT: enhanced quality of voice information.

12 cl, 11 dwg

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