HK1151650B

HK1151650B - Transport format combination selecting method, wireless communication system, and mobile station

Info

Publication number: HK1151650B
Application number: HK11105583.9A
Authority: HK
Inventors: 奈穗子黑田; 孝二郎滨边; 李璡硕
Original assignee: 日本电气株式会社
Priority date: 2004-06-11
Filing date: 2011-06-03
Publication date: 2017-04-13

Description

Transport format combination selection method, wireless communication system and mobile station

The present application is a divisional application of chinese patent application having an application date of 9/5/2005 and an application number of 200580018774.6 entitled "transport format combination selection method, wireless communication system, and mobile station".

Technical Field

The present invention relates to a technique for selecting, for each uplink physical channel in a mobile station of a wireless communication system, a transport format combination representing a combination of transport formats to be set in a transport channel of such an uplink physical channel.

Background

WCDMA (wideband code division multiple access) wireless communication systems employ a direct code spreading multiplexing process. According to the direct code spreading multiplexing process, a transmitting side spreads transmission data using a spreading code, and a receiving side despreads reception data using the same spreading code. The received data thus processed has a higher ratio of desired wave power to interference and noise power (SNIR: signal to noise interference ratio).

At the receiving side, if the SNIR based on the despreading process is equal to or higher than a predetermined value, that is, if the received data has a predetermined or higher quality, it is expected that the received data can be correctly decoded. Therefore, the above-described data spreading and despreading process enables the receiving side to decode the received data of the respective links even when the plurality of links use the same frequency band.

In general, since the spreading ratio of the transmitting side is lower, the number of information bits that can be transmitted simultaneously is larger, and the transmission ratio is higher. On the other hand, since the increase of SNIR based on the despreading process is reduced, the transmission power must be increased to satisfy the predetermined quality.

According to the direct code spread multiplexing procedure, the transmit power of one link acts as the interference power of another link. Therefore, it is important to set a transmission rate capable of making transmission power as small as possible in each link while satisfying transmission rate requirements to reduce interference to other links, and such a transmission rate results in a reduction in the bandwidth of the wireless communication system.

Therefore, the WCDMA wireless communication system controls the transmission power of the mobile station and the base station under high-speed closed-loop transmission power control to achieve transmission data having a predetermined quality.

According to 3GPP (third generation partnership project), it has been studied to give a function of selecting a transport format combination (hereinafter, referred to as "TFC") to a WCDMA mobile station (see 3GPPTS25.321V5.8.0(2004-03) "media access control (mac) protocol specification").

A WCDMA mobile station is able to transmit data for a number of different transport channels over a single physical channel. The mobile station generally uses a DPCH (dedicated physical channel) as a physical channel. The DPCH includes a DPCCH (dedicated physical control channel) for transmitting pilot data and control data and a DPDCH (dedicated physical data channel) for transmitting user data. A transmission type called a transport format (hereinafter referred to as "TF") is set in each transport channel. The setting items of the TF include a transport block size, a CRC (cyclic redundancy check) bit size, a coding process, a Transmission Time Interval (TTI), and the like. The above-described TFC represents a combination of TFCs set in different transport channels.

According to the WCDMA wireless communication system, the base station control device indicates a set of TFCs including one or more TFCs to be granted to a physical channel of each mobile station, and the mobile station selects a TFC to be used for transmitting a DPCH from the set of TFCs indicated by the base station control device.

A procedure for determining a state of a mobile station when using a TFC will be described below with reference to fig. 1.

First, the transmission power of the DPCH when the TFC is used is calculated for each TFC.

Then, the states of the mobile stations when the respective TFCs are used are all classified into the support states.

If, among the TFCs belonging to the supported state, there is a TFC in which the transmission power of the DPCH in the past predetermined time X is greater than the maximum transmission power of the mobile station for the time Y or longer, the state of the mobile station using the TFC is regarded as an excess power state.

If, among the TFCs belonging to the excess power state, there is a TFC which belongs to the excess power state for a predetermined time T or more, the state of the mobile station using the TFC is regarded as the blocked state.

If, among the TFCs belonging to the excess power state or the blocked state, there is a TFC in which the transmission power of the DPCH continues to be equal to or less than the maximum transmission power of the mobile station for a predetermined time Z, the state of the mobile station using the TFC is returned to the support state.

The mobile station determines the state of the mobile station when using the TFC according to the above-described procedure. The mobile station selects a TFC for setting a TF having a high transmission rate in a transport channel having a high priority from TFCs in other states than the blocked state. Since the state of the mobile station when using the TFC is determined based on the long-term propagation path change, a TFC that satisfies the quality requirement on average over a long period of time can be selected even if the propagation path instantaneously changes due to fading or the like.

Currently, according to 3GPP, it is studied to use EUDCH (enhanced uplink data channel) as a physical channel for transmitting a packet at high speed through an uplink. For EUDCH, it is studied that a base station and a base station control device will control a packet transmission format (mainly a transmission rate) of an uplink of a mobile station using a TFC selection function of the mobile station (see 3GPPTR25.896V6.0.0(2004-03) "feasilitystudyfiendehanceduprafdd").

Studies have shown that, in a WCDMA wireless communication system, a base station measures the proportion of noise power (noise rise) in a desired wave of data received from a mobile station, and a base station control apparatus controls the number of mobile stations connected to the base station and the TFC set in the mobile station so that the above-mentioned value measured by the base station does not exceed a predetermined threshold.

However, generally, data transmission between the base station and the base station control apparatus may experience a certain delay, and data transmission from the base station control apparatus to the base station may also experience a large delay. Therefore, it is difficult for the base station control apparatus to control the number of mobile stations and the TFC set according to the instantaneous noise rise variation.

Therefore, the conventional WCDMA wireless communication system has been required to set the number of mobile stations and the TFC set to keep the average noise rise value sufficiently smaller than a predetermined threshold value, thereby preventing a sharp noise rise variation.

For EUDCH, it is studied that a base station indicates a TFC (maximum TFC) whose transmission power is the largest among TFCs allowed to be used to a mobile station at a high speed, and the mobile station selects a TFC in which the transmission power of the EUDCH is equal to or smaller than that of the EUDCH in the case where the maximum TFC indicated by the base station is used.

Since the above-described research makes it possible to reduce the variable noise rise range, the average noise rise value can be set to a higher level. In other words, since the number of mobile stations connected to the base station and the maximum transmission power of the maximum TFC can be set to higher values than before, the coverage and capacity of the uplink can be increased.

However, since the mobile station uses not only EUDCH but also DPCH as described above, the mobile station also needs to select TFC for DPCH. Therefore, the mobile station must select two TFCs, that is, a TFC for EUDCH and a TFC for DPCH.

As described above, the mobile station determines the state of the mobile station to select a TFC based on whether the transmission power consumed when each TFC is used is greater than the maximum transmission power of the mobile station.

As shown in FIG. 2, for example, when the mobile station is to select a TFC for EUDCH (hereinafter referred to as "E-TFC"), the mobile station may select E-TFC4 in which the transmission power of the EUDCH is represented by P_EUDCHIs represented by the formula P_EUDCHLess than maximum transmission power P_maxAnd when the mobile station is to select a TFC for the DPCH, the mobile station may select TFC6 where the transmission power of the DPCH is represented by P_PDCHIs represented by the formula P_PDCHLess than maximum transmission power P_max。

However, when the mobile station transmits data in both the EUDCH and the DPCH, the sum (P) of the transmission power of the EUDCH and the transmission power of the DPCH_EUDCH+P_PDCH) Exceeds the maximum transmission power P of the mobile station_maxResulting in the problem that the mobile station experiences insufficient transmission power.

In this case, the transmit power of either or both of the TFC and E-TFC must be reduced to make power adjustments in order to reduce the total transmit power to be equal to or less than the maximum transmit power P_maxThe level of (c). However, there is another problem in that the quality of data transmitted through the physical channel whose transmission power is reduced is deteriorated.

Disclosure of Invention

It is, therefore, an object of the present invention to provide a transport format combination selection method, a wireless communication system, and a mobile station, which make it possible to select an E-TFC so that the total transmission power does not exceed the maximum power of the mobile station when the mobile station is simultaneously transmitting data in an EUDCH and a DPCH using the selected E-TFC and DPCH.

In a method of selecting a transport format combination according to the present invention, a mobile station selects a first TFC for data transmission in a first physical channel in an uplink between the mobile station and a base station from among a plurality of first TFCs to be set for the first physical channel, and selects a second TFC for data transmission in a second physical channel in the uplink from among a plurality of second TFCs to be set for the second physical channel.

Specifically, the mobile station calculates a transmission power of a first physical channel using a first TFC for each of a plurality of first TFCs, compares the calculated transmission power with a maximum power of the mobile station, and determines whether the mobile station is in a transmission-capable state based on the comparison result. Then, the mobile station calculates a sum of transmission powers of the first and second physical channels using the first and second TFCs for each of a plurality of combinations of the plurality of first and second TFCs, compares the calculated sum of transmission powers with a maximum power of the mobile station, and determines whether the mobile station is in a transmission capable state based on the comparison result. Then, the mobile station selects a first TFC from a plurality of first TFCs in which the mobile station is in a state capable of transmitting. Then, the mobile station selects a second TFC from among a plurality of second TFCs included in a plurality of combinations in which the mobile station is in a state capable of transmitting, from among the plurality of combinations including the selected first TFC. The mobile station then transmits data in the first and second physical channels using the selected first and second TFCs, respectively.

According to the present invention, the second TFC may be selected based on the previously selected first TFC so that the sum of the transmission powers in the first and second physical channels does not exceed the maximum power of the mobile station. Accordingly, since data can be transmitted without reducing the transmission power of the first and second physical channels, degradation of the quality of data transmitted in the first and second physical channels is prevented.

Further, since the mobile station can select the second TFC in conjunction with the first TFC used in actual transmission, a failure in allocating transmission power to the second TFC due to allocation of transmission power to the first TFC is also prevented from occurring, so that the power of the mobile station can be effectively used. Thus, the throughput of the second physical channel is increased.

Further, the function of selecting the second TFC for use in the second physical channel can be added to the mobile station having the function of selecting the first TFC for use in the first physical channel without affecting the existing function of selecting the first TFC.

Drawings

Fig. 1 is a diagram illustrating the manner in which a mobile station of a conventional wireless communication system operates to determine the state of the mobile station;

fig. 2 is a diagram illustrating a manner in which a mobile station of a conventional wireless communication system operates to select a TFC and an E-TFC;

fig. 3 is a diagram showing the arrangement of a wireless communication system according to the present invention;

fig. 4 is a flowchart of an operational sequence for a mobile station of a wireless communication system for determining a state of the mobile station in accordance with the present invention;

fig. 5 is a diagram showing the arrangement of a mobile station of a wireless communication system according to embodiment 1 of the present invention;

fig. 6A is a diagram showing a power offset table used in a mobile station of a wireless communication system according to embodiment 1 of the present invention;

fig. 6B is a diagram showing a power offset table used in a mobile station of a wireless communication system according to embodiment 1 of the present invention;

fig. 7A is a diagram showing a state management table used in a mobile station of a wireless communication system according to embodiment 1 of the present invention;

fig. 7B is a diagram showing a state management table used in a mobile station of a wireless communication system according to embodiment 1 of the present invention;

fig. 8 is a flowchart of an overall operation sequence of a mobile station of a wireless communication system according to embodiment 1 of the present invention;

fig. 9 is a diagram showing the arrangement of a base station control apparatus of a wireless communication system according to embodiment 2 of the present invention;

fig. 10 is a diagram showing the arrangement of a mobile station of a wireless communication system according to embodiment 2 of the present invention;

fig. 11 is a diagram showing a state management table used in a mobile station of a wireless communication system according to embodiment 2 of the present invention;

fig. 12 is a flowchart of an overall operation sequence of a mobile station of a wireless communication system according to embodiment 2 of the present invention;

fig. 13 is a diagram showing a manner in which a mobile station of a wireless communication system according to embodiment 3 of the present invention operates to determine the state of the mobile station;

fig. 14 is a flowchart of an overall operation sequence of a mobile station of a wireless communication system according to embodiment 3 of the present invention;

fig. 15 is a diagram showing a manner in which a mobile station of a wireless communication system according to embodiment 4 of the present invention operates to determine the state of the mobile station;

fig. 16 is a diagram showing a manner in which a mobile station of a wireless communication system according to embodiment 5 of the present invention operates to determine the state of the mobile station; and

fig. 17 is a flowchart of an overall operation sequence of a mobile station of a wireless communication system according to embodiment 5 of the present invention.

Detailed Description

As shown in fig. 3, the wireless communication system according to the present invention has a base station control apparatus 101, base stations 111, 112 connected to the base station control apparatus 101, and mobile stations 121 to 125 connected to the base stations 111 or 112.

Although two base stations are connected to the base station control apparatus 101 in fig. 3, the number of base stations connected to the base station control apparatus 101 is not limited to 2. Further, although there are five mobile stations 121 to 125 connected to the base stations 111, 112, the number of mobile stations is not limited to 5.

Base station 111 is a base station capable of receiving data in EUDCH, and base station 112 is a base station incapable of receiving data in EUDCH.

Therefore, the mobile stations 124, 125 connected to the base station 112 transmit data to and receive data from the base station 112 only in the conventional DPCH. The DPCH includes a DPDCH for transmitting data and a DPCCH for transmitting pilot data and control data.

Mobile stations 121, 123 connected to base station 111 are mobile stations capable of transmitting data in an EUDCH. Mobile stations 121, 123 transmit data to base station 111 and receive data from base station 111 in DPCH and EUDCH. Specifically, through the uplink between mobile stations 121, 123 and base station 111, mobile stations 121, 123 transmit data in DPCH and transmit data at high speed in EUDCH. Through the downlink between mobile stations 121, 123 and base station 111, base station 111 transmits in DPCH and transmits control data in EUDCH.

Mobile station 122 connected to base station 111 is a mobile station that cannot transmit data in the EUDCH. Therefore, mobile station 122 transmits data to base station 111 and receives data from base station 111 only in DPCH.

Base station control apparatus 101 indicates a set of TFCs for DPCH to mobile stations 121 to 125 through base stations 111, 112, and also indicates a set of E-TFCs for EUDCH to mobile stations 121, 123 through base station 111.

Base station 111 measures the proportion of noise power (noise rise) in a desired wave of data received from mobile stations 121, 123 through the uplink, updates the maximum TFC of DPCH and the maximum E-TFC of EUDCH of mobile stations 121, 123 at a predetermined time so that the noise rise will be equal to or less than a predetermined threshold value, and indicates the updated maximum TFC, E-TFC to mobile stations 121, 123. Base station 111 also measures the proportion of noise power (noise rise) in a desired wave of data received from mobile station 122 through the uplink, updates the maximum TFC of the DPCH of mobile station 122 at a predetermined time so that the noise rise will be equal to or less than a predetermined threshold, and indicates the updated maximum TFC to mobile station 122.

The base station 112 measures the proportion of noise power (noise rise) in a desired wave of data received from the mobile stations 124, 125 through the uplink, updates the maximum TFC of the DPCH of the mobile stations 124, 125 at a predetermined time so that the noise rise will be equal to or less than a predetermined threshold, and indicates the updated maximum TFC to the mobile stations 124, 125.

The mobile stations 121, 123 determine the state of the mobile station when using the TFC for each TFC included in the TFC set indicated from the base station control device 101, and also determine the state of the mobile station when using the TFC for each combination of the TFC included in the TFC set indicated from the base station control device 101 and the E-TFC included in the E-TFC set indicated from the base station control device 101. Alternatively, instead of determining the state of the mobile station for each combination of TFC and E-TFC, the mobile station 121, 123 determines the state of the mobile station when the mobile station uses the E-TFC for each E-TFC included in the E-TFC set. Then, the mobile stations 121, 123 select a TFC to be used for transmitting the DPCH and an E-TFC to be used for transmitting the EUDCH based on the determined mobile station state.

The mobile stations 122, 124, 125 determine the state of the mobile station when using the TFC for each TFC included in the TFC set indicated from the base station control device 101, and select a TFC to be used for transmitting the DPCH based on the determined state of the mobile station.

The procedure performed in mobile stations 121, 123 shown in fig. 3 to determine the state of the mobile station when using a TFC, the state of the mobile station when using a combination of a TFC and an E-TFC, and the state of the mobile station when using an E-TFC will be described below.

A procedure for determining a state of a mobile station when the mobile station uses a TFC will be described below with reference to a flowchart shown in fig. 4. In determining the state of the mobile station when using the TFC, information about the transmission power of the DPCCH, the reference power (the maximum power of its own mobile station), the TFC set, and the power offset will be used. The power offset refers to a ratio of transmission power of the DPCCH to transmission power of the DPCH when the corresponding TFC is used.

The mobile stations 121, 123 determine the state of the mobile station in each unit transmission time for each TFC. First, among the TFC set indicated from the base station control apparatus 101, a single TFC in which the state of the mobile station has not been determined in the current unit transmission time is selected. For the selected TFC, the transmission power of the DPCH when the TFC is used is calculated based on the information of the transmission power of the DPCCH and the power offset of the TFC, and recorded in the memory (step 101).

Then, it is determined whether the state of the mobile station when using the TFC in the previous unit transmission time is a support state (a state capable of transmitting data) (step 102). If it is the support state, it is determined whether the number of times the transmission power of the DPCH is equal to or greater than the reference power within the elapsed time X is equal to or greater than Y (step 103).

If it is less than Y in step 103, it is judged that the state of the mobile station when using the TFC in the current unit transmission time is still the support state (step 104). If it is equal to or greater than Y in step 103, it is judged that the state of the mobile station when using the TFC in the current unit transmission time is an excess power state (a state capable of transmitting data) (step 105).

If the state of the mobile station is not the support state in step 102, it is determined whether the transmission power of the DPCH is continuously equal to or less than the reference power when the mobile station uses the TFC for the past time Z (step 106).

If the transmission power of the DPCH continues to be equal to or less than the reference power in the past time Z in step 106, it is judged that the state of the mobile station when using the TFC in the current unit transmission time is the support state (step 104). If the transmission power of the DPCH continues to be not equal to or less than the reference power in the elapsed time Z in step 106, it is determined whether the state of the mobile station when using the TFC in the previous unit transmission time is an excess power state (step 107).

If the state of the mobile station is not the excess power state in step 107, i.e., if it is the blocking state (a state in which data cannot be transmitted), it is judged that the state of the mobile station when using the TFC in the current unit transmission time is also the blocking state (step 108). If the state of the mobile station is the excess power state in step 107, it is determined whether the excess power state when the mobile station uses the TFC continues for the elapsed time T or more (step 109).

If the excess power state of the mobile station continues for the elapsed time T or more in step 109, it is judged that the state of the mobile station when using the TFC in the current unit transmission time is the blocked state (step 108). If the excess power state of the mobile station does not continue for the past time T or more in step 109, it is judged that the state of the mobile station when using the TFC in the current unit transmission time is also the excess power state (step 105).

Then, it is determined whether the mobile station state determination for all TFCs has been completed in the current unit transmission time (step 110). If not, control returns to step 101 and the same procedure as described above is performed for another TFC that has not yet been determined.

The same process as described above is also performed to determine the status of the mobile stations 122, 124, 125.

Example 1:

the arrangement of mobile stations 121, 123 of the wireless communication system according to embodiment 1 of the present invention will be described below with reference to fig. 5.

As shown in fig. 5, each of the mobile stations 121, 123 has a reception processor 301, a control data splitter 302, a transmission power measurement unit 303, an EUDCH transmission controller 304, a DPCH transmission controller 305, and a transmission processor 308.

The reception processor 301 receives data transmitted from the base station 111.

The control data separator 302 separates the data received by the reception processor 301 into user data and control data. The control data separator 302 transmits information on the maximum E-TFC from the control data to the E-TFC selector 307 and transmits other user data and control data to a higher level layer.

In the control data transmitted to the higher-level layer, information of the TFC set transmitted from the base station control apparatus 101 through the base station 111 is transmitted to the TFC selector 310 and the E-TFC selector 307 through the higher-level layer. Information of the E-TFC set transmitted from the base station control apparatus 101 through the base station 111 is transmitted to the E-TFC selector 307 through a higher-level layer. The information of the TFC set and the E-TFC set includes information on the corresponding block sizes, TTIs (transmission time intervals), and coding rates of the TFCs and the E-TFCs.

The transmission power measurement unit 303 measures the transmission power of the DPCCH through the uplink in each unit transmission time and indicates the measurement result to the TFC selector 310 and the E-TFC selector 307.

TFC selector 310 calculates the transmission power of the DPCCH when the mobile station uses the TFC with respect to all TFCs included in the TFCs indicated from base station control apparatus 101, and updates the state of the mobile station when the TFC is used according to the procedure shown in fig. 4. TFC selector 310 also selects a TFC according to the update result of the mobile station state, the priority of each transport channel, and the required transmission rate, and indicates the selected TFC to E-TFC selector 307.

The E-TFC selector 307 calculates the sum of the transmission power of the DPCH and the transmission power of the EUDCH when the mobile station uses the E-TFC and the TFC with respect to all combinations of the E-TFC included in the E-TFC set indicated from the base station control device 101 and the TFC included in the TFC set indicated from the base station control device 101, and updates the state of the mobile station when using the TFC and the TFC according to the procedure shown in fig. 4. The E-TFC selector 307 also selects an E-TFC according to the update result of the mobile station state, the TFC selected by the TFC selector 310, the priority of each transport channel, and the required transmission rate.

TFC selector 310 and E-TFC selector 307 indicate the selected TFC and the selected E-TFC, respectively, to transmit processor 308.

Transmission processor 308 transmits the data stored in buffer 309 to nodeb 111 in the DPDCH and transmits control data to nodeb 111 in the DPCCH, using the TFC indicated from TFC selector 310. Transmission processor 308 also transmits the user data stored in buffer 306 to base station 111 in EUDCH by using the E-TFC indicated from E-TFC selector 307.

The operation of TFC selector 310 to select a TFC and the operation of E-TFC selector 307 to select an E-TFC will be described below with reference to fig. 6 and 7.

A power offset table indicating power offsets for respective TFCs is shown in fig. 6A, and a power offset table indicating power offsets for respective combinations of E-TFCs and TFCs is shown in fig. 6B. A state management table indicating the state of the mobile station for each TFC is shown in fig. 7A, and a state management table indicating the state of the mobile station for each combination of E-TFC and TFC is shown in fig. 7B. The tables shown in fig. 6A and 7A are held by TFC selector 310, and the tables shown in fig. 6B and 7B are held by E-TFC selector 307.

Since TFC selector 310 is informed of the information of the TFC set, TFC selector 310 generates the power offset table shown in fig. 6A from the information. Since the E-TFC selector 307 is informed of the information of the TFC set in addition to the information of the E-TFC set, the E-TFC selector 307 generates the power offset table shown in fig. 6B from the information.

TFC selector 310 calculates the transmission power of the DPCH when the mobile station uses the TFC for each TFC using the power offset table shown in fig. 6A, and determines the state of the mobile station when the TFC is used according to the procedure shown in fig. 4. TFC selector 310 updates the contents of the state management table shown in fig. 7A. In fig. 7A, "S" represents the support state, "E" represents the excess power state, and "B" represents the block state. TFC selector 310 selects a TFC from TFCs in which the mobile station is in a state other than the blocked state so that a TF having a high transmission rate is set in a transport channel having a high priority and the transmission ratio does not exceed a required transmission rate. The selected TFC is indicated from TFC selector 310 to E-TFC selector 307.

The E-TFC selector 307 calculates the sum of the transmission power of the DPCH and the transmission power of the EUDCH when the mobile station uses the TFC and the E-TFC for each combination of the TFC and the E-TFC using the power offset table shown in fig. 6B, and determines the state of the mobile station when the TFC and the E-TFC are used according to the procedure shown in fig. 4. The E-TFC selector 307 updates the contents of the state management table shown in fig. 7B.

Then, the E-TFC selector 307 selects an E-TFC from the E-TFCs included in the combination including the TFC selected by the TFC selector 310 according to a predetermined selection condition. For example, assume that TFC2 is selected (shown shaded in FIG. 7B). In this case, the E-TFC selector 307 selects the E-TFC1, from the E-TFCs 1, E-TFC2 included in the combination (shown shaded in fig. 7B) including TFC2, in which the mobile station is in the state other than the blocked state, in which the transmission rate is higher due to higher priority and as far as possible does not exceed the required transmission rate.

According to the present embodiment, since the mobile stations 121, 123 determine the states of the mobile stations for all combinations of TFCs and E-TFCs, the E-TFC can be selected in accordance with the previously selected TFC so that the total transmission power does not exceed the maximum power of the mobile stations. Therefore, since data can be transmitted without reducing the transmission power of each of the DPCH and EUDCH, the quality of data transmitted in the DPCH and EUDCH is prevented from being degraded.

Further, according to the present embodiment, since the mobile stations 121, 123 can select the E-TFC according to the combination with the TFC used in actual transmission, the occurrence of a failure in allocating transmission power to the EUDCH due to allocation of transmission power to an unused TFC is also prevented, so that the power of the mobile stations can be effectively used. Thus, the throughput of EUDCH is increased.

An operation sequence of the mobile stations 121, 123 of the wireless communication system according to embodiment 1 of the present invention will be described below with reference to a flowchart shown in fig. 8.

As shown in fig. 8, the transmission power measurement unit 303 measures the transmission power of the DPCCH in each predetermined unit transmission time (step 201).

Then, TFC selector 310 determines the state of the mobile station when using the TFC for each TFC according to the procedure shown in fig. 4 (step 202). In determining the state of the mobile station, the maximum power of the mobile station is used as a reference power.

Then, the E-TFC selector 307 determines the state of the mobile station when using the TFC and the E-TFC for each combination of the TFC and the E-TFC according to the procedure shown in fig. 4 (step 203). In determining the state of the mobile station, the maximum power of the mobile station is used as a reference power.

Then, TFC selector 310 and E-TFC selector 307 determine whether it is time immediately before data transmission, i.e., time to select a TFC (step 204). The time is determined based on a Transmission Time Interval (TTI) included in the TFC set and the E-TFC set.

If the above time is reached in step 204, TFC selector 310 calculates, for each transport channel of the DPCH, a required transmission rate for each transport channel from the amount of data stored in buffer 309. Then, TFC selector 310 selects a TFC so that the transmission rate of the transport channel with higher priority is higher and does not exceed the transmission rate required for each transport channel from TFCs included in combinations in which the mobile station is in other states than the blocked state (step 205).

Then, the E-TFC selector 307 calculates, for each transport channel of the EUDCH, a required transmission rate for each transport channel according to the amount of data stored in the buffer 306. Then, the E-TFC selector 307 selects an E-TFC so that the transmission rate of the transport channel having the higher priority is higher and does not exceed the transmission rate required for each transport channel from the E-TFCs included in the combination in which the mobile station is in the state other than the blocked state among the combinations including the TFCs selected as described above (step 206).

Then, at the data transmission time, transmission processor 308 transmits data to base station 111 in DPCH using the TFC selected by TFC selector 310 and transmits data to base station 111 in EUDCH using the E-TFC selected by E-TFC selector 307 (step 207).

The mobile stations 121, 123 repeatedly perform the above-described operation sequence every predetermined unit transmission time.

According to the present embodiment, since the mobile stations 121, 123 determine the states of the mobile stations for all combinations of TFCs and E-TFCs as described above, the E-TFC can be selected in accordance with the previously selected TFC so that the total transmission power does not exceed the maximum power of the mobile stations. Therefore, since data can be transmitted without reducing the transmission power of each of the DPCH and EUDCH, the quality of data transmitted in the DPCH and EUDCH is prevented from being degraded.

Furthermore, according to the present embodiment, the E-TFC selection function of EUDCH can be added to the mobile stations 121, 123 without affecting the existing TFC selection function of DPCH.

Example 2:

the arrangement of the base station control apparatus 101 of the wireless communication system according to embodiment 2 of the present invention will be described below with reference to fig. 9.

As shown in fig. 9, the base station control apparatus 101 according to the present embodiment has a receiving end 701, a receiving processor 702, a controller 703, a transmitting processor 705, and a transmitting end 706.

The receiving end 701 is connected to the base stations 111, 112 and receives user data and control data from the mobile stations 121 to 125 through the base stations 111, 112.

The reception processor 702 separates data received by the reception end 701 into user data and control data, transmits the user data from a higher-level layer to the core network, and transmits the control data to the controller 703. The control data includes information on a service for transmitting data in the DPCH and EUDCH.

The controller 703 has therein a priority determiner 704 for determining a priority representing which of TFC selection and E-TFC selection is to be preferentially processed based on the above-mentioned information on services included in the control data from the reception processor 702, and sends information on the determined priority to the transmission processor 705.

The transmission processor 705 multiplexes the information on the priority from the priority determiner 704 with other user data and control data, and transmits the multiplexed data from the transmitting end 706 to the corresponding mobile stations (mobile stations 121, 123 in this embodiment) through the base stations 111, 112.

The arrangement of mobile stations 121, 123 of a wireless communication system according to embodiment 2 of the present invention will be described below with reference to fig. 10.

As shown in fig. 10, each of mobile stations 121, 123 according to the present embodiment has a reception processor 801, a control data separator 802, a TFC state manager 803, a transmission power measurement unit 804, a TFC selector 805, a transmission processor 806, and a buffer 807.

The reception processor 801 receives data transmitted from the base station 111.

The control data separator 802 separates data received by the reception processor 801 into user data and control data. The control data separator 802 transmits information on priorities for TFC selection and E-TFC selection to the TFC selector 805, and transmits other user data and control data to higher-level layers.

The TFC state manager 803 measures the transmission power of the DPCCH through the uplink in each unit transmission time and indicates the measurement result to the TFC state manager 803.

The TFC state manager 803 calculates the sum of the transmission power of EUDCH and the transmission power of DPCH when the mobile station transmits data using E-TFC and TFC for all combinations of TFC and E-TFC, using information on the transmission power of DPCCH and information on the power offset for each combination of TFC and E-TFC, and determines the state of the mobile station when using E-TFC and TFC according to the procedure shown in fig. 4.

The TFC selector 805 first selects one of the TFC and the E-TFC with a higher priority based on the information on the priority from the control data separator 802 at a predetermined TFC selection time, and then selects the other one according to the selected TFC or E-TFC. TFC selector 805 indicates the selected TFC and E-TFC to transmit processor 806.

Transmission processor 806 transmits the user data of the DPCH stored in buffer 807 to base station 111 in the DPDCH and also transmits the control data to base station 111 in the DPCCH, using the TFC indicated from TFC selector 805. Transmission processor 806 also transmits the user data of the EUDCH stored in buffer 807 in the EUDCH to base station 111 using the E-TFC indicated from TFC selector 805.

The operation of the TFC selector 805 to select the TFC and the E-TFC will be described in detail below with reference to fig. 11.

A state management table indicating the states of the mobile station for the respective combinations of E-TFC and TFC is shown in fig. 11. The table shown in fig. 11 is held by the TFC state manager 803.

The present embodiment is different from embodiment 1 in that the mobile stations 121, 123 manage only one state management table indicating the states of the mobile stations for respective combinations of TFC and E-TFC, and the sequence for performing TFC selection and E-TFC selection can be changed based on the information on priority indicated from the base station control apparatus 101.

First, the TFC selector 805 determines which one of TFC selection and E-TFC selection has higher priority. It is assumed here that E-TFC selection has a higher priority than TFC selection.

Then, the TFC selector 805 selects an E-TFC from the E-TFC0, the E-TFC1, the E-TFC2, and the E-TFC3 included in the combination in which the mobile station is in the state other than the blocked state, in accordance with the priority of each transport channel of the EUDCH and the amount of data stored in the buffer 807, based on the state management table shown in fig. 11. At this time, the TFC selector 805 selects the E-TFC so that the transmission rate of the transport channel having the higher priority among the transport channels of the EUDCH is higher and does not exceed the required transmission rate.

Then, the TFC selector 805 selects a TFC from TFCs included in a combination in which the mobile station is in a state other than the blocked state based on the state management table shown in fig. 11 in accordance with the priority of each transport channel of the DPCH and the amount of data stored in the buffer 807.

For example, assume that TFC selector 805 selects E-TFC3 in FIG. 11. In this case, the TFC selector 805 selects TFC0 included in a combination (shown shaded in fig. 11) of combinations including E-TFC3 in which the mobile station is in a state other than the blocked state.

According to the present embodiment, since the mobile stations 121, 123 determine the state of the mobile stations for all combinations of TFCs and E-TFCs, the E-TFC or TFC can be selected in accordance with the previously selected TFC or E-TFC so that the total transmission power does not exceed the maximum power of the mobile stations. Therefore, the quality of data transmitted in the DPCH and EUDCH is prevented from being degraded.

Further, according to the present embodiment, after one of the TFC and the E-TFC is selected in the mobile stations 121, 123, the E-TFC or the TFC may be selected to effectively use the power of the remaining mobile stations. Thus, throughput is increased.

Further, according to the present embodiment, the base station control apparatus 101 determines the priority regarding TFC selection and E-TFC selection, and indicates the priority to the mobile stations 121, 123. Therefore, it is possible to preferentially allocate the power of the mobile station to a channel that provides a service with strict data delay tolerance, such as a distribution service of audio data and streaming data. Thus, the quality of service is improved.

An operation sequence of the mobile stations 121, 123 of the wireless communication system according to embodiment 2 of the present invention will be described below with reference to a flowchart shown in fig. 12. The present embodiment is different from embodiment 1 in that only the state of the mobile station is determined for the combination of the TFC and the E-TFC (step 302) and the sequence for selecting the TFC and the E-TFC is determined depending on the priority of the TFC and the E-TFC (step 304).

As shown in fig. 12, the transmission power measurement unit 804 measures the transmission power of the DPCCH in each predetermined unit transmission time (step 301).

Then, the TFC state manager 803 determines the state of the mobile station when using the TFC and the E-TFC for all combinations of the TFCs and the E-TFCs (step 302).

Then, the TFC selector 805 determines whether it is time immediately before data transmission, that is, the time to select the TFC and the E-TFC (step 303). If it is time, TFC selector 805 determines which of TFC selection and E-TFC selection has higher priority (step 304).

If TFC selection has a higher priority in step 304, TFC selector 805 calculates, for each transport channel of the DPCH, a required transmission rate for each transport channel according to the amount of data stored in buffer 806. Then, the TFC selector 805 selects a TFC so that the transmission rate of the transport channel with higher priority is higher and does not exceed the transmission rate required for each transport channel from the TFCs included in the combination in which the mobile station is in the other state than the blocked state (step 305). Then, TFC selector 805 calculates a required transmission rate for each transport channel according to the amount of data stored in buffer 807 for each transport channel of EUDCH. Then, TFC selector 805 selects an E-TFC so that the transmission rate of the transport channel with higher priority is higher and does not exceed the transmission rate required for each transport channel from the E-TFCs included in the combination in which the mobile station is in the state other than the blocked state among the combinations including the TFCs selected as described above (step 306).

If the E-TFC selection has a higher priority in step 304, the TFC selector 805 calculates, for each transport channel of the EUDCH, a required transmission rate for each transport channel according to the amount of data stored in the buffer 806. Then, the TFC selector 805 selects an E-TFC from the E-TFCs included in the combination in which the mobile station is in the other state than the blocked state so that the transmission rate of the transport channel with higher priority is higher and does not exceed the transmission rate required for each transport channel (step 307). Then, TFC selector 805 calculates, for each transport channel of the DPCH, a required transmission rate for each transport channel from the amount of data stored in buffer 807. Then, the TFC selector 805 selects a TFC so that the transmission rate of the transport channel having the higher priority is higher and does not exceed the transmission rate required for each transport channel from TFCs included in combinations in which the mobile station is in a state other than the blocked state among combinations including the E-TFCs selected as described above (step 308).

Then, at the data transmission time, the transmission processor 803 transmits data to the base station 111 in DPCH and EUDCH by using the TFC and E-TFC selected by the TFC selector 805 (step 309).

According to the present embodiment, as described above, in addition to the function of embodiment 1, a function for controlling the priority regarding TFC selection and E-TFC selection depending on the service class is also added to the base station control apparatus 101.

Therefore, in addition to the advantages of embodiment 1, it is also possible to preferentially allocate the power of the mobile station to a channel that provides a service having strict requirements against data delay (e.g., a distribution service of audio data and stream data). Thus, the quality of service is improved.

Example 3:

the arrangement of the mobile stations 121, 123 of the wireless communication system according to embodiment 3 of the present invention is the same as that of embodiment 1 shown in fig. 5, and therefore, a description thereof will be omitted.

The manner in which mobile stations 121, 123 of the wireless communication system according to embodiment 3 of the present invention operate to select a TFC and an E-TFC will be described below with reference to fig. 13.

TFC selector 310 determines a state of the mobile station when each TFC is used, based on the maximum power of the mobile station as a reference power. In fig. 13, the state of the mobile station is judged as the support state regardless of which of TFC0 through TFC5 is used because the transmission power is smaller than the reference power. It is assumed here that transmit processor 308 is currently transmitting data in a DPCH using TFC3 because the transmission rate required for the DPCH is less than the maximum TFC.

The E-TFC selector 307 determines the state of the mobile station when using each E-TFC based on the reference power with the remaining power, which is generated by subtracting the current transmission power of the DPCH from the maximum power of the mobile station, as shown in fig. 13. Specifically, the E-TFC selector 307 determines the state of the E-TFC based on the transmission power that can be actually allocated to the EUDCH in each unit transmission time. The transmission power of the DPCH is measured by a transmission power measurement unit 303.

Generally, the continuous data transmission time is longer than a predetermined period for selecting a TFC, and traffic variation has a certain correlation in terms of time. When data is transmitted in a DPCH at a predetermined transmission time interval, the power required to transmit the data in the DPCH is considered to be close to the power required to transmit the data in the DPCH after the next transmission time interval elapses.

Therefore, according to the present embodiment, the probability of being able to select an E-TFC in which the total transmission power does not exceed the maximum power of the mobile station after the next transmission time interval elapses is increased. By selecting such an E-TFC, the quality of data transmitted in the DPCH and EUDCH is prevented from being degraded. Furthermore, the likelihood of maintaining transmit power for unused TFCs is reduced. Thus, the throughput of EUDCH is increased.

For example, if the traffic of the DPCH is high, the current transmit power of the DPCH is high. Since the reference power for determining the state of the mobile station for each E-TFC is reduced, the mobile station is in a blocked state when the E-TFC including a transport channel having a high transmission rate is selected.

In contrast, if the traffic of the DPCH is low, the reference power for determining the state of the mobile station for each E-TFC increases. Therefore, an E-TFC including a transport channel having a high transmission rate can be selected.

According to the present embodiment, as described above, the mobile stations 121, 123 can select the E-TFC according to the traffic of the DPCH so that the total transmission power of the DPCH and EUDCH is equal to or less than the maximum power of the mobile station and the transmission rate of the EUDCH is as high as possible. At this time, the TPC used in the DPCH is selected based on the maximum power up to this time. Thus, the E-TFC selection function of EUDCH can be added to the mobile stations 121, 123 without affecting the existing TFC selection function of DPCH.

According to the present embodiment, unlike embodiment 1, the mobile stations 121, 123 can determine one state for each E-TFC, so that the amount of calculation required to determine the state can be reduced.

An operation sequence of the mobile stations 121, 123 of the wireless communication system according to embodiment 3 of the present invention will be described below with reference to a flowchart shown in fig. 14.

As shown in fig. 14, the transmission power measurement unit 303 measures the transmission power of the DPCCH in each predetermined unit transmission time (step 401).

Then, TFC selector 310 determines the state of the mobile station when using the TFC for each TFC according to the procedure shown in fig. 4 (step 402). In determining the state of the mobile station, the maximum power of the mobile station is used as a reference power.

Then, the E-TFC selector 307 determines the state of the mobile station when using the E-TFC for each TFC according to the procedure shown in fig. 4 (step 403). In determining the state of the mobile station, a remaining power, which is generated by subtracting the current transmission power of the DPCH from the maximum power of the mobile station, is used as a reference power.

Then, TFC selector 310 and E-TFC selector 307 determine whether it is time immediately before data transmission, that is, the time to select TFC and E-TFC (step 404). The time is determined based on a Transmission Time Interval (TTI) included in the TFC set and the E-TFC set.

If the above time is reached in step 404, TFC selector 310 calculates a required transmission rate for each transport channel of the DPCH from the amount of data stored in buffer 309 for each transport channel. Then, TFC selector 310 selects a TFC so that the transmission rate of the transport channel with higher priority is higher and does not exceed the transmission rate required for each transport channel from among TFCs in which the mobile station is in the state other than the blocked state (step 405).

Then, the E-TFC selector 307 calculates, for each transport channel of the EUDCH, a required transmission rate for each transport channel according to the amount of data stored in the buffer 306. Then, the E-TFC selector 307 selects an E-TFC from the E-TFCs in which the mobile station is in the other state than the blocked state so that the transmission rate of the transport channel with higher priority is higher and does not exceed the transmission rate required for each transport channel (step 406).

Then, at the data transmission time, transmission processor 308 transmits data to base station 111 in DPCH using the TFC selected by TFC selector 310 and transmits data to base station 111 in EUDCH using the E-TFC selected by E-TFC selector 307 (step 407).

According to the present embodiment, as described above, the mobile stations 121, 123 determine the state of the E-TFC using the remaining power, which is generated by subtracting the current transmission power of the DPCH, that is, the transmission power allocatable to the EUDCH, from the maximum power of the mobile station, as the reference power. Therefore, the probability that the total transmission power of the DPCH and EUDCH does not exceed the maximum power can be increased according to the traffic of the DPCH. Further, the quality of data transmitted in the DPCH and EUDCH is prevented from being degraded. If the DPCH has a low traffic, the throughput of EUDCH is increased since the E-TFC including a transport channel having a high transmission rate can be selected accordingly.

Further, according to the present embodiment, the TFC selection function of EUDCH can be added to the mobile stations 121, 123 without affecting the existing TFC selection function of DPCH.

Example 4:

the present embodiment is different from embodiment 3 described above in that the state of the mobile station when each E-TFC is used is adjusted when the TFC selected by TFC selector 310 is different from the previous TFC.

For example, as shown in fig. 15, assume that the transmission power of the DPDCH using the selected TFC is higher than the transmission power of the DPDCH using the previous TFC by Δ P_dpch1E-TFC selector 307 calculates the difference Δ P between E-TFC5 and E-TFC4, where Δ crr denotes the power offset of the DPCCH relative to the selected TFC, and Δ pre denotes the power offset of the DPCCH relative to the previous TFC_eudch1DPCCH transmit power × (Δ etfc5- Δ etfc4), where in E-TFC5 the transmit power of EUDCH is the smallest of the E-TFCs where the mobile station is in the blocked state, and in E-TFC4 the transmit power is the largest except for E-TFC5_dpch1Greater than Δ P_eudch1Then E-TFC selector 307 sets the state of the mobile station for E-TFC4 to the blocking state. Δ etfc4 represents the power offset of the DPCCH relative to E-TFC4, and Δ etfc5 represents the power offset of the DPCCH relative to E-TFC 5.

In contrast, assume that the transmission power of the DPDCH using the selected TFC is lower than the transmission power of the DPDCH using the previous TFC by Δ P_dpch2. The E-TFC selector 307 calculates the difference Δ P between E-TFC3 and E-TFC4_eudch2Wherein in E-TFC3, the transmission power of EUDCH is the smallest among E-TFCs in which the mobile station is in the blocked state, and in E-TFC4, the transmission power is the largest except for E-TFC 3. At this time, if Δ P_eudch2Less than Δ P_dpch2Then E-TFC selector 307 sets the state of the mobile station for E-TFC4 to the excess power state.

According to the present embodiment, as described above, even if the TFC of the DPCH is changed, the mobile stations 121, 123 can select the E-TFC by adjusting the state of the mobile stations when using the E-TFC according to an increase or decrease in the transmission power of the DPCH due to the change of the TFC. Therefore, in addition to the advantages provided by embodiment 3, the probability that the sum of the transmission power of the DPCH using the selected TFC and E-TFC and the transmission power of the EUDCH is equal to or less than the maximum power of the mobile station is further increased, thereby preventing the quality of data transmitted in the DPCH and the EUDCH from being degraded.

Furthermore, according to the present embodiment, the possibility of maintaining transmission power for unused TFCs is reduced. Thus, the throughput of EUDCH is increased.

Example 5:

the arrangement of the mobile stations 121, 123 of the wireless communication system according to embodiment 5 of the present invention is the same as that of embodiment 1 shown in fig. 5, and therefore, a description thereof will be omitted.

The manner in which mobile stations 121, 123 of the wireless communication system according to embodiment 5 of the present invention operate to select a TFC and an E-TFC will be described below with reference to fig. 16.

TFC selector 310 determines a state of the mobile station when each TFC is used, based on the maximum power of the mobile station as a reference power. In fig. 16, the state of the mobile station is judged as the support state regardless of which of TFC0 through TFC5 is used because the transmission power is smaller than the reference power. It is assumed here that TFC3 was selected by TFC selector 310.

The E-TFC selector 307 determines the state of the mobile station when using each E-TFC based on the remaining power, which is generated by subtracting the transmission power of the DPCH when the mobile station uses the TFC with the maximum transmission power (maximum TFC), from the maximum power of the mobile station, as shown in fig. 16. Therefore, even if TFC selector 310 selects the maximum TFC, E-TFC selector 307 can select the E-TFC so that the sum of the transmission power of the DPCH and the transmission power of the EUDCH is equal to or less than the maximum power of the mobile station.

If there is an E-TFC in which the mobile station is in the blocked state, E-TFC selector 307 calculates the difference Δ P between the transmission power of the DPCH using the largest TFC and the transmission power of the DPCH using the selected TFC after the TFC is selected by TFC selector 310_unusedWherein the mobile station is in a state other than the blocked state and the transmission power is maximum in the maximum TFC. Then, the E-TFC selector 307 calculates the difference Δ P between the transmission power of the E-TFC in which the mobile station is in the blocked state and the transmission power of such an E-TFC in descending order of the power offsets_eudchIn the E-TFC, the transmission power of the EUDCH is highest in the E-TFC in which the mobile station is in a state other than the blocked state. If Δ P_unusedGreater than Δ P_eudchThe E-TFC selector 307 sets the state of the mobile station when using the corresponding E-TFC to an excess power state.

For example, in FIG. 16, the mobile station is in a transmit capable state up to E-TFC 2. However, if a higher E-TFC is used, the mobile station is in the blocking state (unable to transmit state). In the DPCH, since the mobile station transmits data using TFC3, there is Δ P in the power of the mobile station_unusedThe amount of (c) is not used.

The E-TFC selector 307 compares the difference Δ P between the transmission power of E-TFC3 and the transmission power of E-TFC2_eudch1And Δ P_unusedIn contrast, where the mobile station is in the blocked state in E-TFC3, and in E-TFC2, the transmit power of the EUDCH is highest in the E-TFCs where the mobile station is in a state other than the blocked state. Since in this case Δ P_unusedGreater than Δ P_eudch1And therefore the E-TFC selector 307 changes the state of the mobile station using the E-TFC3 to the excess power state. Similarly, E-TFC selector 307 compares the difference Δ P between the transmit power of E-TFC4 and the transmit power of E-TFC2_eudch2And Δ P_unusedAnd (6) comparing. Since in this case Δ P_unusedIs also greater than Δ P_eudch1And therefore the E-TFC selector 307 changes the state of the mobile station using the E-TFC4 to the excess power state.

According to the present embodiment, as described above, the mobile stations 121, 123 can always select to include a transmission channel having a higher transmission rate, so that the power of the mobile stations can be efficiently used. Thus, the throughput of EUDCH is increased.

Further, according to the present embodiment, the mobile stations 121, 123 select a TFC to be used in the DPCH based on the maximum power up to that time. Therefore, the E-TFC selection function of EUDCH can be added to the mobile stations 121, 123 without affecting the existing TFC selection function.

An operation sequence of the mobile stations 121, 123 of the wireless communication system according to embodiment 5 of the present invention will be described below with reference to a flowchart shown in fig. 17.

As shown in fig. 17, the transmission power measurement unit 303 measures the transmission power of the DPCCH in each predetermined unit transmission time (step 501).

Then, TFC selector 310 determines the state of the mobile station when using the TFC for each TFC according to the procedure shown in fig. 4 (step 502). In determining the state of the mobile station, the maximum power of the mobile station is used as a reference power.

Then, the E-TFC selector 307 determines the state of the mobile station when using the E-TFC for each TFC according to the procedure shown in fig. 4 (step 503). In determining the state of the mobile station, a remaining power generated by subtracting the transmission power of the DPCH in which the mobile station is in a state other than the blocking state and the transmission power of the DPCH is maximum from the maximum power of the mobile station is used as a reference power.

Then, TFC selector 310 and E-TFC selector 307 determine whether it is time immediately before data transmission, that is, the time to select TFC and E-TFC (step 504). The time is determined based on a Transmission Time Interval (TTI) included in the TFC set and the E-TFC set.

If the above time is reached in step 504, TFC selector 310 calculates, for each transport channel of the DPCH, a required transmission rate for each transport channel from the amount of data stored in buffer 309. Then, TFC selector 310 selects a TFC so that the transmission rate of the transport channel with higher priority is higher and does not exceed the transmission rate required for each transport channel from among TFCs in which the mobile station is in the state other than the blocked state (step 505).

E-TFC selector 307 calculates difference Δ P between transmission power of a TFC in which transmission power of DPCH is maximum and transmission power of DPCH of the selected TFC_unused. Then, the E-TFC selector 307 calculates the difference Δ P between the transmission power of the E-TFC in which the mobile station is in the blocked state and the EUDCH transmission power of such an E-TFC in descending order of the power offset_eudchIn the E-TFC, the transmission power of the EUDCH is highest in the E-TFC in which the mobile station is in a state other than the blocked state. If Δ P_eudchLess than Δ P_unusedThe E-TFC selector 307 sets the state of the mobile station when the corresponding E-TFC is used to an excess power state (step 506).

Then, the E-TFC selector 307 calculates, for each transport channel of the EUDCH, a required transmission rate for each transport channel according to the amount of data stored in the buffer 306. Then, the E-TFC selector 307 selects an E-TFC from the E-TFCs in which the mobile station is in the other state than the blocked state so that the transmission rate of the transport channel with higher priority is higher and does not exceed the transmission rate required for each transport channel (step 507).

Then, at the data transmission time, transmission processor 308 transmits data to base station 111 in DPCH using the TFC selected by TFC selector 310 and transmits data to base station 111 in EUDCH using the E-TFC selected by E-TFC selector 307 (step 508).

According to the present embodiment, as described above, the mobile stations 121, 123 determine the state of the E-TFC based on the remaining power as the transmission power, which is generated by subtracting the transmission power of the DPCH using the maximum TFC in which the mobile station is in the other state than the blocked state and the transmission power of the DPCH is maximum, from the maximum power of the mobile station. Then, the state of the mobile station for the corresponding E-TFC is changed from the blocked state to the excess power state depending on a difference between the transmission power of the DPCH using the largest TFC and the transmission power of the DPCH using the selected TFC.

Therefore, even if the traffic of the DPCH varies, it is possible to increase the probability of selecting the E-TFC so that the total transmission power of the DPCH and EUDCH does not exceed the maximum power, and to prevent the quality of data transmitted in the DPCH and EUDCH from being degraded. If the DPCH has a low traffic, the throughput of EUDCH is increased since the E-TFC including a transport channel having a high transmission rate can be selected accordingly.

Example 6:

according to embodiment 6 of the present invention, priorities of TFC selection and E-TFC selection are determined in accordance with contents of a service provided in a DPCH and a service provided in an EUDCH, and processing of the DPCH and processing of the EUDCH according to embodiment 3 are exchanged in accordance with the determined priorities.

Specifically, if the priority of TFC selection is higher, TFC selection and E-TFC selection are performed in the manner described in embodiment 3 above. If the priority of E-TFC selection is higher, the state of the mobile station when using each TFC is determined based on the remaining power, which is generated by subtracting the current transmission power of EUDCH from the maximum power of the mobile station, as a reference power.

Therefore, according to the present embodiment, it is therefore possible to preferentially allocate the power of the mobile station to a channel that provides a service (e.g., distribution service of audio data and streaming data) having strict data delay tolerance requirements. Thus, the quality of service is improved.

The priority of the DPCH and EUDCH may be determined by the base station control apparatus 101 and indicated to the mobile stations 121, 123, or may be determined by the mobile stations 121, 123.

Example 7:

according to embodiment 7 of the present invention, priorities of TFC selection and E-TFC selection are determined in accordance with contents of a service provided in a DPCH and a service provided in an EUDCH, and processing of the DPCH and processing of the EUDCH according to embodiment 5 are exchanged in accordance with the determined priorities.

Specifically, if the priority of TFC selection is higher, TFC selection and E-TFC selection are performed in the manner described in embodiment 5 above. If the priority of E-TFC selection is higher, the state of the mobile station when each TFC is used is determined based on the reference power, which is the residual power generated by subtracting the current transmission power of the EUDCH using the E-TFC in which the transmission power of the EUDCH is the maximum, from the maximum power of the mobile station.

Claims

1. A method of selecting a transport format combination by a mobile station, the mobile station selecting a first transport format combination for data transmission in a first physical channel between the mobile station and a base station and selecting a second transport format combination for data transmission in a second physical channel between the mobile station and the base station, the method comprising:

selecting a first transport format combination from a plurality of first transport format combinations set for a first physical channel, wherein the first transport format combination is selected from first transport format combinations for which the mobile station is in a transmission-capable state when the selected first transport format combination is used for transmitting data in the first physical channel;

calculating a remaining power by subtracting the transmission power of the first physical channel used with the second physical channel from a maximum transmission power of the mobile station;

selecting a second transport format combination from a plurality of second transport format combinations set for the second physical channel,

wherein the second transport format combination is selected from among the second transport formats in which the mobile station is in a transmission-capable state while using each combination of the second transport format combinations and the selected first transport format combination, and

wherein the state of the mobile station for each second transport format combination is determined based on whether the selected second transport format combination does not exceed the remaining power so that the mobile station is in a transmittable state when the selected second transport format combination is used to transmit data in the second physical channel while the selected first transport format combination is used to transmit data in the first physical channel.

2. A wireless communication system comprising a base station and at least one mobile station, wherein the mobile station selects a first transport format combination for data transmission in a first physical channel in the uplink between the mobile station and the base station and a second transport format combination for data transmission in a second physical channel in the uplink between the mobile station and the base station; and is

The mobile station includes:

a first tfc selector that selects a first tfc from among a plurality of first tfcs set for a first physical channel, wherein the first tfc is selected by the first tfc selector from among first tfcs in which the mobile station is in a state capable of transmitting when the first tfc is used to transmit data in the first physical channel;

a second transport format combination selector that selects a second transport format combination from among a plurality of second transport format combinations set for a second physical channel,

wherein the second transport format combination is selected by the second transport format combination selector from among the second transport formats in which the mobile station is in a transmission-capable state while using each combination of the second transport format combination and the selected first transport format combination, and

wherein the state of the mobile station for each second transport format combination is determined by the second transport format combination selector based on whether the selected second transport format combination does not exceed a remaining power so that the mobile station is in a transmittable state when the selected second transport format combination is used to transmit data in the second physical channel while the selected first transport format combination is used to transmit data in the first physical channel,

wherein the remaining power is calculated by subtracting the transmission power of the first physical channel used with the second physical channel from a maximum transmission power of the mobile station.

3. A mobile station that selects a first transport format combination for data transmission in a first physical channel in an uplink between the mobile station and a base station and a second transport format combination for data transmission in a second physical channel in the uplink between the mobile station and the base station, comprising:

a first tfc selector that selects a first tfc from among a plurality of first tfcs set for a first physical channel, wherein the first tfc is selected by the first tfc selector from among the first tfcs in which the mobile station is in a transmission-capable state when the selected first tfc is used in the first physical channel to transmit data;