Basic station, mobile station and method to control transfer capacity

FIELD: radio engineering.

SUBSTANCE: basic station comprises facilities to determine capacity of transfer of mobile station on the basis of quality of reception of pilot channel in uplink; facilities of information transfer relative to certain capacity to mobile station; and facilities to receive control channel, transmitted by mobile station in compliance with received information. Accordingly, regardless of history of transfer capacity maintenance in preceding continuous time interval, for the purpose to control capacity, mobile station every time in process of packet transfer receives instruction of capacity establishment from basic station.

EFFECT: control of transfer capacity of common control channel properly so that transfer of common control channel with permanent quality.

17 cl, 18 dwg

 

The technical field to which the invention relates.

The present invention generally relates to the field of radio communications. More specifically, the present invention relates to a base station, mobile station and method of controlling the transmit power of the common control channel used for communication with the packet.

The level of technology

In the mobile communication system such as IMT-2000, control of transmission power is performed in order to increase bandwidth, battery saving mobile station and the like, for Example, a measure of the quality of the channel is performed on the receiving side, and the code (TRS, Transmission Power Code power control of the transmission is transmitted on the reverse channel (e.g., shared physical channel, DPCCH, Dedicated Physical Control Channel), so that the channel reception is at this point in time, answered the required quality. The result is the updated value of the transmission power in increments of, for example, 1 dB, and the procedure of measuring the quality and the transmission/reception code TRS are repeated, so that the transmission power was gradually changing, placing it closer to the optimal value. That is, in case communication with the switching of channels individual channel assign specific mobile station, and transmission power of the mobile station gradually regulate on the basis of predictory the change of the transmission power at some time. This control of power transmission is described, for example, non-patent document 1.

[Non-patent document 1] Keiji Tachikawa, "W-CDMA mobile communication scheme ("mobile communications Technology, W-CDMA"), MARUZEN, pp.126-128.

In future mobile communication systems instead of the traditional technologies of communication switched adopted the technology of communications with packet switching. Radioresource in batch form shared by many subscribers, and planning for access to specified radioresource properly implemented in the base station. In such a mobile communication system does not exist the mobile station, for which only the currently selected radioresource, or mobile station, which is waiting for resource allocation, but still did not get it. In addition, this situation occurs in the channels as the ascending and descending line. To make the mobile stations that fall in different communication conditions, to operate properly, it is necessary to transmit the common control channel was constant quality. Thus, it is necessary to properly control the transmission power of the shared control channel. But the above method of controlling the transmit power used when switching channels cannot be used in the form in which it exists, and any suitable method yet with the Dan.

The present invention is the creation of a base station, mobile station and method of power control for controlling transmission power of the shared control channel - a method suitable for communication packet.

Disclosure of inventions

In accordance with the present invention offers a base station that includes means for determining the transmit power of the mobile station based on the reception quality of the pilot channel in uplink communication; means of transmitting to the mobile station information with respect to a particular transmit power; and means receiving the control channel transmitted by the mobile station in accordance with the received information.

According to the present invention, the transmission power of the common control channel can be controlled using a method suitable for communication packet.

Brief description of drawings

1 shows a block diagram of a base station corresponding to a variant implementation of the present invention.

Figure 2 shows a block diagram of a mobile station corresponding to the variant of implementation of the present invention.

Figure 3 shows a diagram illustrating the method of controlling the transmit power corresponding to the implementation of the present invention.

Figure 4 presents tables which, illustrating the example of mutual correspondence between CQI, the number of MCS and transmission power.

Figure 5 shows a table illustrating an example of mutual correspondence between CQI, the number of MCS and transmission power.

6 is a diagram showing examples of display of the pilot channel.

7 depicts a table that shows the information elements included in the control channel uplink connection.

On Fig depicts a diagram illustrating an example of resource allocation for shared data channel uplink connection.

On figa-9D shows several candidates that are considered when allocating bandwidth.

Figure 10 shows a diagram of the principle of operation of the AMS.

Figure 11 depicts a flow diagram illustrating a method of controlling the transmit power corresponding to the implementation of the present invention.

On Fig presents a table illustrating an example of mutual correspondence of the reception quality and the transmission power.

On Fig depicts a table that shows the information elements included in the control channel downlink.

On Fig depicts a table showing an example of power control corresponding to the implementation of the present invention.

On Fig depicts a chart illustrating R is diacetate resources and the coding block.

A list of reference designations

11: block modulation and coding

12: block multiplexing

13: RF block

14: unit determining transmission power

21: RF block

23: the processing unit of the pilot channel

24: block demodulation and decoding

The implementation of the invention

In accordance with one embodiment of the present invention relative or the absolute value of the power at which the mobile station is required to change the capacity of its transmission, is determined on the basis of the ratio between the reception quality of the pilot channel in the uplink communication and the reception quality, which must meet the control channel, or the value of the transmission power of the pilot channel. Thus obtained output value is transmitted to the mobile station, in order to properly control the transmission power in the uplink communication. Accordingly, without using the background changes the transmission power for the last continuous period of time, the mobile station receives from the base station an instruction transmit power whenever produces forward the packet, and thus is able to adjust the capacity of its transmission.

If the mobile station has not received such instruction, the transmission of the pilot channel in uplink communications PR is performed after performing certain procedures. During this procedure the mobile station on the downlink are communicated to a pilot channel and a transmit power, and the mobile station determines the value of the capacity of its transmission on the basis of the average value of the loss distribution of the signal between the mobile station and the base station. The transmission of the pilot channel in the uplink communication is performed using a specific capacity values, and the specified channel is received by the base station. Accordingly, the base station based on the pilot channel transmitted by the mobile station can properly determine the transmit power of the mobile station in the next time.

Loss of signal propagation can be calculated from the reception quality of the pilot channel in the downlink and values of transmit power.

In accordance with another embodiment of the present invention, the base station performs reception of one or both of the two pilot channels:

the first pilot channel, in which the structure of the introduction of a character constant, and the second pilot channel, in which the structure of the introduction of the character variable. By preparing many types of pilot channels in the uplink communication can be considered as the accuracy of estimating the channel and the effectiveness of knowledge transfer.

In accordance with another one the m of the embodiment of the present invention the mobile station, which transmits useful data (hereinafter, "traffic data"), are forced to transmit the control channel using a power value, which is derived from the pilot channel in uplink communication. A mobile station which does not transmit traffic data, force transmit the control channel using power obtained based on the average loss of signal propagation. As the number of mobile stations that are transmitting data traffic is relatively small, the efficiency of power control can be increased through the application of the method of controlling the transmit power based on the CQI-only data to mobile stations.

The base station may further comprise means, which determine a frequency block that can be used by the mobile station to transmit data traffic, and determine the transmit power of the mobile station. The transmit power and frequency block can be determined so that the transmission power has exceeded a specified threshold and to use the largest possible number of frequency blocks. Accordingly easily and properly can be assigned to resources shared data channel.

In accordance with another embodiment of the present invention hundred base the information includes means for transmitting a common pilot channel (common pilot channel); means for determining the set of values of the transmission power of the common control channel (shared control channel) on the basis of the quality of reception of the common pilot channel by multiple mobile stations, the information which is transmitted via uplink communication; and means for transmitting a common control channel to multiple mobile stations using specific values of transmit power.

In the mobile station, receiving traffic data, the obtained values of the transmission power may be transmitted separately. Accordingly, it is possible to control transmission power of each mobile station. For mobile stations that are receiving traffic data, may be transferred to one of the received values of transmit power. Accordingly, multiple mobile stations may be set to the same value of the transmission power. As such values may be the transmit power corresponding to the mobile station, which showed the worst CQI value among the set of mobile stations.

The common control channel can be transmitted to the mobile station, which does not receive data traffic, using pre-determined value of the transmission power.

Accordingly, the control of transmission power for the common control channel may also be performed for the mobile stations that want is aizvesti only the transmission of data traffic on an ascending line.

The base station may include an encoder for encoding data for one or more mobile stations as a whole, these data for one or more mobile stations can transmit using the same values of power transfer. By matching the size of the encoded data block with the data range for which maintained the same transmit power, it is possible to properly combine the ability of the system to the error correction redundant transmit power or its lack. For example, the encoding (decoding) can be simplified and used this power is not too high and not too low, and on the other hand, the transmit power can be increased and to ensure a good ability to correct errors.

Option 1

In downlink, the base station transmits to all subscribers of the common pilot channel, and the mobile station that wants to exchange data in downlink, and notifies the base station data quality reception common pilot channel, so you can expect that the base station sets the transmission power of the shared control channel in the downlink. However, in uplink communication common pilot channel cannot be used. This variant implementation of izobreteny is conceived as a means of solving this problem. Next will be considered the method of controlling the transmit power for the common control channel uplink communication in a mobile communication system with packet switching.

Figure 1 shows a base station corresponding to a variant implementation of the present invention. The base station contains the block 11 modulation and coding, which performs multi-level modulation of transmitted data and channel coding, block 12 (MUX) MUX, which performs multiplexing of the modulated signal and the pilot channel, and the wireless unit 13 (RF), which converts the multiplexed signal into a signal having a format that is intended for transmission from the antenna; and the base station further comprises a block 14 to determine the transmission power, which determines the transmit power of the mobile station based on the information received from the older device, base station, or another mobile station, or on the basis of the data base station.

Figure 2 shows a mobile station, corresponding to a variant of implementation of the present invention. The mobile station includes a radio frequency unit 21 (RF), which converts the signal format which is accepted by the antenna unit 22 (DeMUX) demuxing, which performs demultiplexing pilot what about the channel and another channel in the received signal, block 23 processing of the pilot channel, which performs channel estimation using the pilot channel and measures the transmission loss and the like parameters and the block 24 demodulation and decoding, which demodulates the received data and performs decoding with error correction.

Figure 3 presents a diagram illustrating the method of controlling the transmit power in the uplink communication, corresponding to the implementation of the present invention. In the present embodiment is to prepare a common control channel with a fixed baud rate and total data channel with a variable speed transmission of information in the channels of upward communication. The method of controlling the transmit power, which is discussed below, can be applied to the common control channel and a shared data channel. As the transmission rate information of the common control channel is constant, it is important to control the transmit power of the mobile station to monitor the reception quality of the common control channel. On the other hand, to control the reception quality of the common control channel in addition to controlling the transmit power of the mobile station has the possibility to regulate the speed of information transmission. The speed of p is passing can be adjusted by changing the number of levels of the multilevel modulation or by changing the coding rate of the data. Incidentally, although in this embodiment, for the sake of simplicity, the transmission speed shared control channel is fixed at a constant level, in another embodiment, the rate of information transmission in the General control channel can be changed.

In step 1 from the base station to the mobile station on the downlink is transmitted pilot channel, and also via the signaling path (annunciation channel or a broadcast channel (VSN, broadcast channel) data is transmitted power value Pttransmission of the pilot channel.

As shown, in stage 2 mobile station for some time takes on a downlink pilot channel and the value of the transmission power to calculate the average losses L signal propagation. The magnitude of the losses L signal propagation is mainly determined by the variation of the distance and shading, and in the General case, when averaged over an appropriate time interval, there is no strong differences between losses L distribution in ascending and descending lines. For example, by averaging the data of the reception quality for a relatively long period of time, for example, for the period of one frame or several frames, eliminating the influence of instantaneous changes in such factors as fading. Figure 10 presents an example of depending is between the instantaneous value of the SIR at reception and the average SIR at the reception. Although in the present embodiment, the reception quality measured by the value of the SINR, it can be measured in the form of SIR value or other value that indicates quality. The target value of the quality indicator, i.e. the value of SIRtthat tends to get the base station when the lead receiving channel of upward communication line can be represented by the following equation:

.

In this expression Puprepresents the power (in this case - control object) transmission of the mobile station, I0represents the capacity of the interference channel uplink communication, observed at the base station. Loss L distribution represent the difference between the power Pttransmission base station and power Prthe reception of the mobile station. Channel signaling transmitted by the base station contains data power Pttransmission base station, the power of I0interference in the uplink communication and the target value of the quality indicator SIRt.

In step 3 according to figure 3 from the mobile station to the base station transmitted pilot channel. Power transmission in a given time equal power, which compensates for the loss distribution calculated in step 2. But this power does not compensate for the instantaneous fading of the signal on the track which is hraneniya in the ascending line.

In step 4, the base station measures the difference between the index of quality (SINR at the reception) of the pilot channel received on the uplink communication, and the desired value of the quality indicator (required SINR), which is expected for the pilot channel. Power, which represents the difference (the difference of capacity)is the amount of power (relative power), to which the mobile station should change the capacity of its transmission from the current value, so that the quality of the channel, the received base station, became equal to the desired reception quality. In the process of determining the specified difference of capacity, a base station may use a table that contains the value of the SIR, the required SIR value, the number of MCS and the value of the difference in power that you should change the capacity from its current value. The number of MCS specifies a combination of the number of levels of the multilevel modulation and coding rate. Figure 4 shows an example of a table that establishes the mutual correspondence between the state information of the channel quality indicator channel CQI), which is transmitted from the base station to the mobile station, the number of MCS and transmission power of the mobile station. Usually information on the status of the channel is measured as the value of SIR. In the example in figure 4 the number of MCS and transmission power can is to be derived from the indicator CQI (SIR), which is measured by the base station, and a message which is transmitted from the base station. Figure 5 shows an example table that may be used in the case where the base station to the mobile station instead of the CQI information is the number of the MCS. Figs.4 and 5 are just examples of tables used for determining the transmission power, but the transmission power can be determined from other ratios match.

In step 5, the base station using the control channel downlink, and notifies the mobile station data difference in power that the mobile station should change the capacity of its transmission from the current value.

In step 6, the mobile station adjusts the power of its transmission based on the instructions sent by the control channel. The amount by which adjusted, in this case differs from similar actions in the management code TRS (correction is not performed in steps of 1 dB up or down) from the current value to the target value correction is made by a certain amount at one time.

Phase 7 is the transmission of the control channel using the adjusted values of power transfer. This value of transmission power is a value that compensates not only the loss distribution with the persecuted, but such a sudden change, as fading. Then, if you re-run the procedure from step 3 to step 7 or repeat procedure steps 7, 4, and 6 for each package, it is possible to properly maintain the appropriate level of transmission power of the mobile station in the uplink communication. However, in step 3 when the repeated use of activated pilot channel, which accompanies the control channel uplink connection.

Option 2

In the second embodiment of the present invention processes at stages 3, 4 and 5 differ from those shown in figure 3. Since the processes occurring at other stages identical to one already described, repeated description is not provided.

In step 3, the mobile station in addition to the transmission of the pilot channel to the base station transmits data to the transmission power of the pilot channel.

In step 4, the base station measures the reception quality (SINR value at the reception) received pilot channel. The base station compares the reception quality with the required quality and calculates the power value characterizing the difference. The amount of this power value and the power value of the transmission indicate the absolute value of the power with which the mobile station should transmit channel to quality in the mA channel base station began to conform to the required quality. Similarly in the first embodiment of the invention is the capacity (the difference of capacity), which is indicated as the difference indicates the amount of power (relative value of power), to which the mobile station should change the capacity of its transmission from the current value, so that the reception quality of the channel base station began to conform to the required quality.

In step 5, the base station for downlink mobile station transmits data on one or both quantities: the relative amount of power and absolute power.

In step 6, the mobile station corrects the transmission power according to the instruction transmitted by the control channel.

Phase 7 is the transmission of the control channel using the adjusted values of power transfer. Then, if you re-run the procedure from step 3 to step 7 or repeat procedure steps 7, 4, and 6 for each package, it is possible to properly maintain the appropriate level of transmission power of the mobile station in the uplink communication.

Option 3

The pilot channel of upward communication line represents a separate pilot channel, which is different for each mobile station and which is used for estimating the channel, measuring the quality of reception, engagement Singh is anizatio and similar operations in the uplink communication. For accurate control of the state radio that changes at each point in time, it is better to perform the transmission of multiple pilot channels. However, since the pilot channel is a known signal, the greater the amount of transmission of the pilot channel, the more reduced the efficiency of transmission. Furthermore, it is not necessary to perform all operations: estimation of the channel, measuring the quality of reception, capturing synchronization in uplink communication on the same frequency.

From this point of view in the third embodiment of the present invention is the preparation of two types of pilot channels of upward communication line, one of which is a reference pilot channel (reference pilot channel), which is not necessarily accompanied by a shared control channel, and the other is a pilot channel for channel estimation, which accompanies the shared data channel.

Supporting pilot channel can be used for estimation of the channel, receiving data quality measurement and capture synchronization for uplink communication, and in terms of applications, it is similar to a standard channel. However, it differs from the traditional channel, at least, the fact that a transfer is made, even though you are controlling transmission power in accordance with the first and second variants of the embodiment of the invention, so that the reception quality is maintained. In addition, estimation of the channel should be implemented to compensate for losses on the route propagation signal for demodulation of the common control channel. With this purpose, the reference pilot channel transmit, accompanying the shared control channel. On the other hand, for measuring the reception quality in the ascending line of the reference pilot channel can be transferred independently, without attaching a shared control channel. However, the structure of the injection symbol register in advance as a distinctive sign. Figure 6(A) shows a situation in which you are passing a reference pilot channel accompanying the shared control channel, and transmission independent of the reference pilot channel.

The pilot channel used for channel estimation, accompanied by shared data channel and is used for channel estimation. Options (C) (D) figure 6 illustrate examples of implementation of the pilot channel, intended for channel estimation. Since the mobile station can move with different speeds, both high and low, a situation may arise in which a change of state of the channel in time will largely depend on the mobile station. In this case, as shown in Fig.6 (C) and (D), in contrast to 6 (C) for the purposes of estimating the channel along the time axis implementing mn is the number of pilot channels, designed for estimation of the channel so that the accuracy of estimating the channel for a subscriber, moving at high speed can be increased. For a mobile station that does not move with high speed, at the expense of possibly more rare pilot channel designed for estimation of the channel, you can increase the effectiveness of knowledge transfer. Since the pilot channel used for channel estimation, is either passed or not passed, then it can be called a pilot channel to capture the support of the pilot channel, the transmission of which is always. In accordance with this embodiment of the invention, providing many types of pilot channels and introducing their adaptive way according to the task application or situation radio, you can increase the accuracy of estimating the channel and increase the efficiency of information transfer.

Option 4

As mentioned above, in the mobile communication system has a mobile station, which is actually allocated radioresource, but also a mobile station that wishes that she were allocated radioresource, but which radioresource is not already highlighted. This situation occurs in the channels as uplink communication and downlink. Therefore, the common control channel includes inform the information in these different States.

Figure 7 presents the information elements that may be included in a common control channel uplink communication. Among the control information shown in rows (1)-(4), lines (1) and (2) contains the information data shared data channel downlink, and in rows (3) and (4) - information data shared data channel uplink connection.

In line (1) contains the information of the response transmitted by the mobile station when the mobile station for which at this time is actually passing data traffic on the downlink, takes on a downlink shared data channel. When the mobile station can normally be taken on a downlink shared data channel, it sends a base station acknowledgement (ACK), and when the mobile station shared data channel for downlink normally cannot accept it returns to the base station a negative acknowledgement (NACK).

In row (2) indicates the CQI information transmitted to the base station, mobile station, which currently does not transmit traffic data in the ascending line, but who wants to perform data transfer in the future. A mobile station that wants to perform data transfer for uplink communications, measures the reception quality of the pilot Kahn is La, included in the signaling path, and informs the base station the measurement results of reception quality in the form of CQI for scheduling request on the next time.

In line (3) contains the information accompanying the shared data channel uplink communication transmitted by the mobile station, which at this time is actually producing the transmission of data traffic on an ascending line. This accompanying information is used, for example, for demodulating the shared data channel to the base station. More specifically, the accompanying information may include modulation scheme, the size of the unit, the management information is re-transmitted, the ID of the mobile station and the like, the modulation Scheme is information for specifying a schema, for example, QPSK, 16QAM, etc. and it can be represented as the number of levels of the multilevel modulation. Information management re-transmission may include the operation number to indicate the position of the package when hybrid ARQ (HARQ), the format of redundancy re-transmitted code, the new data indicator indicating whether the package is new data or re-transmitted packet, and similar information.

In line (4) contains the information transmitted to the base station, mobile station, which currently does not transmission the data traffic, but who wants to perform data transfer in the future. Consider the information may contain data transmit power or status of a buffer of the mobile station. For example, the power transmission may include information indicating the amount of power by which the mobile station transmits a common control channel, information on the maximum transmit power that indicates how large the maximum power with which the mobile station can transmit, etc. the state of the buffer can be represented by the amount of data stored in the transmission buffer of the mobile station (coefficient buffer). For example, more than this amount of data, the above can be given priority when scheduling.

In this embodiment of the invention, the base station determines which of the items (1)to(4) corresponds to the content, transmitted through the common control channel. As a result, with regard to the mobile station((1), (3)), which actually performs data transmission traffic control transmit power of the common control channel uplink communication is performed by the method described in the first or second versions of the implementation. That is, the base station measures the reception quality of the pilot channel received from the mobile station, and in accordance with the laws the AI with this quality determines and transmits to the mobile station, the data transmission power for the mobile station, so that the mobile station has made the transmission of the common control channel uplink communications respectively received information (for convenience, this method of controlling the transmit power can be called "power control, transmission CQI").

On the other hand, as for the mobile station((2), (4)), which at the moment does not transmit traffic data in the ascending line, but wants to perform data transfer in the future, control the transmit power of the common control channel in the uplink communication is performed by the method described for stages 2 and 3 of figure 3. That is, a mobile station for some time performs the reception of the pilot channel and the channel signal to calculate the mean of the loss distribution of the signal and then to transmit the common control channel in uplink communication to compensate for the loss distribution and to compensate for the interference power at the location of the base station (for convenience, this method of controlling the transmit power can be called "slow power control, transmission").

Since when controlling transmit power for CQI in each moment of time is an adaptive change in power, computational load associated with the definition of power, great. Therefore, if the total transmit power is the first control channel in the uplink communication for all mobile stations is based on the CQI, there is a fear that the computational load and the delay in the base station will be very big. On the other hand, with regard to the common control channel in the uplink communication to the mobile station corresponding to the rows (2) and (4), i.e. the station does not perform data transmission traffic, the importance of the above factors are lower than for the mobile station, corresponding to the rows (1) and (3). For example, if an erroneous definition of the acknowledgement (ACK) to control the re-transmission amount of useless traffic increases, adversely affecting the system. But, even if it is mistakenly determined the status of the buffer of the mobile station, a strong negative impacts will not occur. In addition, there is a possibility that the number of mobile stations belonging to the rows (2) and (4)will be significantly greater than the number of mobile stations corresponding to rows (1) and (3). Accordingly, in this embodiment of the invention, power control, transmission CQI is performed for the mobile stations corresponding to rows (1) and (3)to produce a precise control of the transmit power at which to respond to an instantaneous change of fading. Then, for mobile stations corresponding to the rows (2) and (4), is the slow power control, transmission with no com is Ansatie instant changes of fading, and slow power control of the transmission is effected so that the signal quality to support on average. Accordingly, the power control transmission CQI described in the first and second embodiments of the invention, can be used effectively.

Option 5

On Fig shows an example of allocation radioresource for the shared data channel uplink communication in accordance with the fifth embodiment of the present invention. Each procedure shown in Fig, is performed in the base station. According to the present invention includes a mobile station, which currently translates data traffic using a common data channel uplink communication. This mobile station performs the transmission of the common control channel uplink communication or pilot channel or the same channel, including the element (3) information, which is shown in Fig.7. in the fourth embodiment variant. The base station receives a pilot channel transmitted by the mobile station, and the sequence of actions shown in Fig, comes to the stage 10.

On stage 10 is the measurement of the reception quality information CQI.

At step 12, based on the CQI measurement and information about the transmission power received from the mobile station of the determined frequency band shared data channel uplink communication for the mobile station. In this embodiment of the invention useful frequency band is divided into multiple frequency blocks (frequency block or frequency chunk), each of which includes one or more subcarriers. Basically, the present invention is intended for use in the communication system, which uses the technology of multiplexing orthogonal frequency division (OFDM, Orthogonal Frequency Division Multiplexing). One or more frequency blocks can make a unit (block) allocation of resources (unit of resource assignment), block retransmission unit of retransmission) or the coding block (unit of coding). In the present invention as the unit of resource allocation is set to one frequency block.

On figa-9D presents several candidates that are considered when allocating bandwidth. In each case the horizontal axis corresponds to the frequency f and the vertical axis corresponds to the power P. As shown in figa, band of 10 MHz is divided into four frequency block 2.5 MHz. On stage 12 Fig resource determination is made so that the power was greater than the threshold power Pthbased on information received from the mobile station, and the band was supported as widely as possible (band frequency is determined so that the transmit power per frequency unit, Rav is alas or was greater than the threshold power, and bandwidth when transmitting occupied the widest possible frequency range). For example, with regard to data transmission power of the mobile station received from the mobile station, then assume that the ratio between the threshold power Pthand frequency blocks such as shown in Fig.9. In this case, when the resource allocation corresponding figa and 9B, since the power is less than the threshold power, these two candidates are eliminated. Despite the fact that in each case figs and 9D power exceeds the threshold value due to the fact that figs occupied a wider band of frequencies, this method is defined as the optimal resource allocation.

At step 14 Fig selects non MCS in accordance with the power, which is defined on the stage 12.

In step 16 on the common control channel downlink to the mobile station is the number of the MCS obtained at step 14, band information to specify frequency block)mounted on the stage 12, the transmit power and similar data. Accordingly, a mobile station can properly handle the transfer of shared data channel in uplink communication. In accordance with the present invention, as shown in figure 10, to account for the instantaneous fading is some scheme of adaptive modulation and coding (the MS, Adaptive Modulation and Coding), and number of MCS adaptive image is updated for each TTI, as shown in the example of figure 10. Through the use of AMS in addition to the slow power control to bring the average SIR at the reception as close as possible to the target value can raise the quality of transmission of the shared data channel uplink connection.

Option 6

Controlling transmission power in uplink communication considered in embodiments of the invention with the first and fifth, and the method of controlling the transmit power for the downlink is considered in the sixth embodiment of the present invention. Figure 11 shows the diagram of the algorithm operations, showing the method of controlling the transmit power corresponding to the considered variant of implementation of the present invention. As shown, at step 112, the base station transmits a common pilot channel to the mobile stations that work with this base station. Specified common pilot channel differs from the pilot channel transmitted from each mobile station in the ascending line of communication, in the sense that the common pilot channel is uniformly transmitted to all mobile stations. At step 114, based on the received common pilot channel, the mobile station measures the reception quality in the form of CQI values. M the mobile station, participating in the process of data transmission on downlink, at step 116 reports the measured CQI value to the base station using a common control channel uplink communication. At step 118, the base station based on the received CQI information determines the transmission power of the shared control channel downlink. The mutual correspondence between the CQI data and power transmission shown in Fig, prepared in advance. At step 120, the base station performs the transmission of the common control channel on the downlink, using the value of power, which was determined at step 118. Accordingly, the transmission power of the shared control channel in the downlink may be determined based on the CQI values measured by the mobile station (for convenience, this method can be called "control of transmit power in the downlink on CQI").

On Fig shows the information elements that may be included in a common control channel downlink. These elements can mainly be divided into control information for downlink (left column) and control information for uplink communication (right column). In addition, as shown on the left side of the table control information in General is divided into information physical layer (top of the line) and level 2 (L2) (bottom row). Control information downlink may include information for demodulation, scheduling information and the control information retransmission (HARQ). Information for demodulation may include information on the selection of the frequency blocks, information on the modulation data and information on the size of the block. Information on the selection of the frequency blocks is information to specify frequency block allocated to the mobile station for the shared data channel downlink. Information on the modulation data is information for specifying a modulation scheme applied in the shared data channel, and it can be specified in the form of non-MCS. Information on the size specifies the number of transmitted bits; it may be associated with the encoding speed and can also be specified in the form of non-MCS. Information on planning may include identification data for recognizing the mobile station. Control information retransmission may include the operation number for the transmitted packet, information specifying the format of redundancy and a pointer to the new data. Index new data is a characteristic that indicates whether the package is a new package or a package that is transmitted again.

Managing the information uplink communication may include code to control the transmit power, code synchronization control transmission response code channel free access (contention-based channel), information planning, information management re-transmission (HARQ) and similar information. Code control transmit power and code synchronization control transfer point transmit power and transmission time when performing transmission on uplink common channel data, and these values are determined by the base station in the planning process and transmitted to the mobile station. Channel free access is a channel that can be transmitted from the mobile station to the base station without planning, and this channel, which may cause competition between the mobile station and another mobile station. Channel free access can be a fast channel access or similar channel, which includes service reservation request scheduling shared data channel, the data traffic of small volume or data management. The control information includes response information (ACK/NACK), the content of which indicates whether the base station duly adopted channel free access transmitted from the mobile station. Information planning may include information identifying the mobile station, and the information on allocation of frequency blocks, information on the modulation data, the size and similar information. These information elements are similar to those that were considered for the downlink, but differ in that they are intended for uplink communication. Information management re-transmission (HARQ) includes information (ACK/NACK), which indicates whether the base station duly adopted by the information transmitted to it by the mobile station.

A mobile station that receives control information on downlink (left column)actually receives traffic data using a common data channel downlink. Therefore, as the number of mobile stations such as the maximum number of subscribers that can be allocated resources, the number of such mobile stations may not be very large. Therefore, the power control common control channel downlink can be based on CQI for each mobile station. As an alternative, to other mobile stations can be applied a method of power control in downlink for CQI for the mobile station, corresponding to the worst indicator CQI among the many mobile stations. On the other hand, the number of mobile stations that are receiving control information down the line tie is, includes mobile stations that wish to pass data traffic on the shared data channel uplink communication in a given time or in the future (right column). In respect of such mobile stations, i.e. stations receiving control information on a downlink, the method of controlling the transmit power in the downlink on the CQI can be performed for each mobile station, or to other mobile stations can likewise use the method of "control power on CQI for the mobile station corresponding to low indicator CQI. However, there may be multiple mobile stations (including mobile stations that want to transmit data on the uplink communication), which currently do not receive data traffic on the downlink and will not keep this technique in the future. In addition, since such mobile stations are not required to transmit to the base station data reception quality of the pilot channel quality information CQI, the implementation of power control in downlink for CQI difficult. With regard to such a mobile station, in this embodiment of the invention the transmission of the common control channel is power, which is fixed at a constant level.

On Fig shows an example of control power is s, corresponding to the present invention. In this example, among the five subscribers subscribers #1 - #3 are receiving data traffic on the downlink. Therefore, control of the common control channel downlink to the subscriber #1 can be realized by controlling the transmit power in the downlink on the basis of the CQI data; it itself is the transmit power indicated P1. For subscribers #2 and #3, in the same way, monitoring can be done separately, by controlling the transmission power in the downlink on the basis of the CQI data; transmit power indicated, respectively, P2. and R3. Alternatively, control of the transmission power of the mobile station that indicates the worst CQI among the three subscribers, can be applied to other mobile stations. Power α transmission (where α=1, 2, or 3) in this case, set the total for subscribers #1 - #3. In addition, in the example shown in Fig remaining five subscribers subscribers #4 and #5 do not receive data traffic on the downlink, so that the transmission of the common control channel downlink for these mobile stations is carried out using a fixed power level Pfix.

The data transmitted from the transmitter is subjected to encoding, modulation, displayed on the radio resources that are pre is bratvany in the transmitted symbol (for example, in the OFDM symbol) and sent into the ether. The encoding is done to enable error correction. Can run convolutional coding, turbomotive or similar operations. As a single element for the implementation of the encoding can be one frequency block, or can be encoded as one data set of frequency blocks. As for this version of the invention, it is desirable to encode data such blocks, within each of which specifies the same transmit power. For example, when control power transmission is performed for each subscriber, it is desirable that the encoding was performed for each subscriber. When control power transmission is performed for three subscribers in General, it is desirable that the encoding was performed for three subscribers as a whole.

For example, for the situation described in relation to Fig, assume that the resources of three subscribers #1, #2, #3 is selected, as shown in Fig (1). One frequency block allocated to the subscriber #1, three frequency block allocated to the subscriber #2 and four frequency block allocated to the subscriber #3. The coding is performed for each subscriber, and each of the three data ranges, circled thickened line is encoded separately. As for these fragments is s data you control three subscribers separately, a method of power control of the transmission CQI", and the value of the transmit power, respectively denoted as P1P2and R3. On Fig(2) also presents a situation in which the coding and power control is performed separately for each subscriber, but the allocation of frequencies more. In the example shown in Fig(3), these three parties are coded as one unit, and the control mode (the control of transmit power in the downlink on CQI), accepted for one subscriber, applied to the remaining subscribers. The transmit power indicated α (where α=1, 2, or 3) and is the amount of power transmission for the subscriber, which indicates the worst value of the CQI. By the way, numbers and blocks a single encoding is given merely as examples and can be taken a variety of rooms and size. In General, the larger the block for encoding, the greater the ability to correct errors, but the more computational load. So in the example Fig(1) the computational load for encoding and decoding small, and management of power transmission is carried out in an optimal way without its excessive excess or shortage. On the other hand, in the example shown in Fig(3), although the computational load during encoding and Dec is giovanii becomes large, you can expect enhanced ability to fix errors, and also because two subscribers of the three power becomes greater than necessary, can be expected to improve data transmission. From the viewpoint of simplifying processes and improving quality, it is desirable for the data included in one coding block, when you manage to have the same power as is customary in the present embodiment of the invention.

This patent application claims priority on application Japan 2005-174395, filed in the Japan patent office on June 14, 2005, and at the request of Japan 2005-241902, filed in the Japan patent office on August 23, 2005, the contents of which are entirely included in the present description by reference.

1. The base station containing
means for determining the transmit power of the mobile station based on the reception quality of the pilot channel in uplink communication;
means of transmitting to the mobile station information with respect to a particular transmit power; and
means of reception of the control channel transmitted by the mobile station according to the information received,
the information with respect to a particular transmit power, transmitted from the base station to the mobile station, is a correction value in excess of 1 dB, n is which correction current value of the transmit power of the mobile station to the target value.

2. The base station according to claim 1, characterized in that it is arranged to determine the relative power values at which the mobile station should change the capacity of its transmission, on the basis of the ratio between the reception quality of the pilot channel in the uplink communication and the reception quality, which must satisfy the control channel.

3. The base station according to claim 1, characterized in that it is arranged to determine the absolute power values to which the mobile station should change the capacity of its transmission, on the basis of the ratio between the reception quality of the pilot channel in the uplink communication and the value of the transmission power of the pilot channel.

4. The base station according to claim 1, characterized in that the uplink pilot channel information and the transmission power for downlink and with the possibility of reception of the pilot channel in uplink communication, which is transmitted from the power, the value of which is determined by the mobile station on the basis of the average value of the loss distribution of the signal between the mobile station and the base station.

5. The base station according to claim 4, characterized in that the determination of the magnitude of the loss distribution of the signal is performed based on the reception quality and value of the transmission power of the pilot channel downstream of St. the zi.

6. The base station according to claim 1, characterized in that it is configured to receive one or both of the following pilot channels: the first pilot channel, in which the structure of the introduction of a character constant, and the second pilot channel, in which the structure of the introduction of the character variable.

7. The base station according to claim 4, characterized in that it has a capability to force a mobile station that broadcasts traffic data, to transmit the control channel using the capacity specified on the basis of the pilot channel in uplink communication; and the ability to force a mobile station which does not transmit traffic data, to transmit the control channel using the power determined based on the average loss of signal propagation.

8. The base station according to claim 1, characterized in that it further comprises means for determining the frequency block that can be used by the mobile station to transmit traffic data, and means for determining the transmit power of the mobile station.

9. The base station of claim 8, characterized in that the said means is arranged to determine the transmission power and frequency of the unit so that the transmission power has exceeded a specified threshold, and to use as possible cyclicality blocks.

10. The base station containing
means of transmitting the common pilot channel;
means for determining the set of values of the transmission power of the common control channel based on the quality of reception of the common pilot channel by multiple mobile stations, the information which is transmitted via uplink communication; and
means of transmitting the common control channel to multiple mobile stations using specific values of transmit power,
while the base station is configured to transmit the common control channel using the specified values of the transmission power of the mobile station which does not receive data traffic.

11. The base station of claim 10, characterized in that it is made with the possibility of transferring certain power values of the individual mobile stations, leading receive data traffic.

12. The base station of claim 10, characterized in that made with the possibility of sending one of the defined values of the power of mobile stations, a leading receive data traffic.

13. The base station of claim 10, characterized in that it contains an encoder for encoding data for one or more mobile stations, as a whole, and the transfer of said data to one or more mobile stations is performed using the same power value.

14. Mobile is the first station, contains
means of receiving information about transmission power for downlink, when the base station determines the amount of power that the mobile station should change the capacity of its transmission, based on the reception quality of the pilot channel in uplink communication; and
means changes the capacity of its transmission based on the received data for transmission on the control channel,
the information with respect to a particular transmit power, transmitted from the base station to the mobile station, is a correction value greater than 1 dB, which is the correction of the current value of the transmit power of the mobile station to the target value.

15. Mobile station 14, characterized in that made with the possibility of reception of the pilot channel and the value of the transmission power in downlink, with the ability to determine the value of the transmission power on the basis of the average value of the loss distribution of the signal between the mobile station and the base station and the uplink pilot channel for uplink communication using a specific power value.

16. Mobile station 14, characterized in that it is arranged to transmit one or both of the following pilot channels: the first pilot channel, to the torus structure of the introduction of a character constant, and the second pilot channel, in which the structure of the introduction of the character variable.

17. The method of controlling the transmit power at which
determine on the base station the value of the transmission power at which the mobile station should change the capacity of its transmission, based on the reception quality of the pilot channel in uplink communication,
transmit information regarding a certain value of the transmission power to the mobile station, and
change the transmit power of the mobile station according to the information received, to transmit the control channel,
the information with respect to a particular transmit power, transmitted from the base station to the mobile station, is a correction value that is greater than 1 dB, which is the correction of the current value of the transmit power of the mobile station to the target value.



 

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30 cl, 15 dwg

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1 cl, 3 dwg

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