Power control for communications systems utilizing high speed shared channels

The present invention relates to a power control method and device in a wireless communication system, and more particularly to a power control method and device in a system using a high-speed SCH.

Wireless telecommunications systems are well known in the art. Standards have been developed and implemented to provide global connectivity to wireless systems. GSM (Global System for Mobile Telecommunications) is known as one of the standards currently in widespread use. This is considered the so-called 2G (second generation) mobile wireless system standard, followed by the 2.5G (generation) mobile wireless system standard. GPRS (General Packet Radio Service) and EDGE are examples of 2.5G technologies that provide relatively high-speed data services in addition to (2G) GSM networks. Each of these standards attempts to improve the previous standard by adding features and enhancements. In January 1998, ETSI SMG (European Telecommunications Standard Institute-Special Mobile) Group) has agreed on a wireless access scheme for a 3G wireless system called UMTS (Universal Mobile Telecommunications System). In December 1998, the 3GPP (Third Generation Partnership Project) was formed to further implement the UMTS standard. 3GPP continues to work on a common 3G mobile wireless standard.

Figure 1 shows a typical UMTS system architecture that complies with the current 3GPP standard. This UMTS network architecture includes a CN (Core Network), which is connected to the UTRAN (UMTS Terrestrial Radio Access Network) via an interface known as Iu. This Iu is defined in detail in the currently generally available 3GPP standard documentation. This UTRAN is configured to provide wireless telecommunications services to users via a wireless interface known as Uu and via a WTRU (wireless transmit receive unit) known as UE (User Equipment) in 3GPP. ing. This UTRAN is one or more RNCs (Radio Network) It has a Controller) and multiple base stations, which are known as Node B in 3GPP, and when these base stations are assembled, they are geographically for wireless communication with the UE. Service area is provided. One or more nodes B are connected to each RNC via an interface known as Iub in 3GPP. In this UTRAN, several groups of node B are connected to different RNCs (only two are shown in Figure 1). When multiple RNCs are provided in this UTRAN, inter-RNC communication is performed via the Iur interface.

At the user level, communication outside these multiple network components is performed by node B via the Uu interface, and at the network level, by various CN connections with external systems.

In general, the primary function of a base station, such as Node B, is to provide a wireless connection between the base station's network and the WTRU. Typically, the base station emits a common channel signal that allows the disconnected WTRU to synchronize with the timing of the base station. In 3GPP, node B makes a physical radio connection with the UE. Node B receives a signal from the RNC via the Iub interface that controls the radio signal transmitted by node B via the Uu interface.

The CN is responsible for routing the information to the correct destination. For example, this CN can route voice traffic received by UMTS from the UE via one node B to the PSTN (public switched telephone network), or it can route packet data destined for the Internet to the PSTN. Can be routed to the (public switched telephone network). In 3GPP, this CN has the following six main components: 1) serving GPRS (general packet radio service) support node, 2) gateway GPRS support node, and 3) border gateway. 4) visitor location register and 5) mobile services switching It has a center) and 6) a gateway mobile service exchange station. Serving GPRS support nodes provide access to packet-switched domains such as the Internet. A gateway GPRS support node is a gateway node for connecting to other networks. Network of other operators or the All data traffic to the Internet goes through the gateway GPRS support node. Border Gateway acts as a firewall that prevents intrusion into the network and attacks subscribers within the network area. A visitor location register is a "copy" of subscriber data required by the network currently providing the service to provide the service. This information initially comes from the database that manages mobile subscribers. The mobile service exchange station is responsible for the "circuit-switched" connection between the UMTS terminal equipment and the network. The gateway mobile service exchange station implements the required routing functionality based on the current location of the subscriber. The gateway mobile service also receives and manages connection requests from subscribers from external networks.

These RNCs generally control the internal functions of UTRAN. These RNCs also provide intermediate services with local and external service components in communication. The local service component is due to the Uu interface connection with node B. The external service component is the connection between the CN and the external system, such as an oversea call made from a local UMTS cell phone.

Typically, RNC's overseas base stations manage radio resources within the geographic area of the wireless radio service area served by Node B and control physical radio resources for the Uu interface. To do. In 3GPP, RNC's Iu interface provides two connections. One is a connection to a packet-switched domain, and the other is a connection to a circuit-switched domain. Other important features of these RNCs include confidentiality protection and integrity protection.

Various power control methods for wireless communication systems are well known in the art. An example of an open-loop power control transmitter system for a wireless communication system and an example of a closed-loop power control transmitter system are shown in FIGS. 2 and 3, respectively. The purpose of such a system is to minimize transmitter power to the extent that data is received at the remote end with acceptable quality when the channel is propagating the fading and the interference changes over time. The purpose is to change the transmitter power quickly.

In communication systems, such as 3GPP TDD (Time Division Duplex) systems and FDD (Frequency Division Duplex) systems, multiple SCHs and DCHs of variable speed data are combined for transmission. Background standard data for such systems can be found in Non-Patent Documents 1-4. Patent Documents 1 and 2 teach high-speed power control methods and systems adapted to data rate changes that provide better performance.

When SCH is utilized, different WTRUs can use the same channel, and a particular WTRU can use the channel sporadically. We use the power control value of this particular SCH as follows, that is, because the relative position of the WTRU can be substantially changed after the WTRU uses a particular SCH. We recognize that the metrics used to adjust in this way are not readily available. Therefore, if these WTRUs allow sporadic use of such channels, it is desirable to provide methods and devices for controlling the power of the SCH.

For example, for physical channels specified by 3GPP R5 (Release 5) of UTRA TDD (UMTS Terrestrial Radio Access Time Division Duplex), HS that operates in cooperation with HS-DSCH (High Speed Downlink Shared Channel) -Includes SICH (High Speed Shared Information Channel). HS-SICH is a high speed UL (Uplink) feedback channel used in UTRA TDD R5 for HSDPA (High Speed Downlink Packet Access). This HS-SICH sends a 1-bit Ack / Nack message and a measurement report with a length of several bits from a specific WTRU that receives DL (downlink) transmission via HS-DSCH.

This HS-DSCH is an HSDPA R5 DL channel used to send packages to scheduling users with very high throughput. This scheduling is used based on estimated instantaneous channel quality for different users and high speed L1 (Level 1) retransmission techniques including hybrid ARQ (automatic repeat requests). Only a single WTRU receives DL transmission via HS-DSCH within TTI (Transmission Time Interval). TTI is currently specified as 10 msec for HS-DSCH. DL for a particular WTRU This particular WTRU receives this DL transmission normally so that there is a one-to-one correlation between the TTI containing the HS-DSCH and the TTI containing the UL knowledge of this particular WTRU. A transmission that acknowledges whether it has been received or has been abnormally received is received within the specified TTI via HS-SICH. It is preferable that this acknowledge is transmitted in the i-th TTI after the DL transmission TTI. However, i is a number exceeding 5. Therefore, in a predetermined TTI, only one WTRU transmits with UL HS-SICH, and a plurality of different WTRUs use UL HS-SICH to acknowledge packet reception with each other TTI.

As with multiple UL channels, it is desirable to use looped power control with WTRU to determine the UL transmit power required for HS-SICH. Conventionally, the WTRU can be configured with the open-loop power control transmitter of FIG. 2, but in this configuration, is the WTRU measuring DL path loss and broadcast from UTRAN to the WTRU? The UL interference level signaled is taken into account.

So-called outer loop power control is also preferably implemented in the open loop power control of FIG. 2 so that the reception quality satisfies the target quality. Here, the Tx power adjustment value is generated according to a metric such as a target SIR (Signal to Interference Ratio). This target SIR is used to control the reception quality of the signal. The higher the target SIR, the better the demodulation, which means more interference from other users in the system. The smaller the target SIR, the less interference the other users in the system will cause, but the lower the demodulation quality. Conventionally, this target SIR is dynamically adjusted by an outer loop power control that updates the desired value as a function of interference in the system and the quality of the UL channel.

The WTRU's outer loop function relies on observing received UL transmissions by the base station, eg, observing BLER (block-error rates) or received SIRs. If, for example, BLER exceeds the permissible value, for example, in 3GPP R5, BLER> 0.1, and if there are many errors and user data cannot be used, a higher target SIR is set for the WTRU. Is signaled to, and the WTRU applies this target SIR to adjust the transmit power of the WTRU. However, since SCH such as HS-SICH is time-shared, if only a specific WTRU transmits sporadically in SCH, the WTRU-specific BLER or measured SIR is constantly applied. Observing at a frequency that allows outer loop power control becomes very difficult.

Accommodate worst-case WTRU with worst-case target SIR instead of outer-loop power control where measurements are generated from UL signals received from a particular WTRU to ensure and simplify system operation. High target SIR on HS-SICH can be selected. However, depending on the degree of interference obtained, it becomes difficult to allocate other channels to the TS (Time Slot) including HS-SICH. As a result, resources are consumed. For resource efficiency, it is desirable to operate several channels on TS, including HS-SICH, but this problem is exacerbated. If the outer loop power control is not performed, the code resources in HS-SICH are consumed. In general, if WTRU is unable to achieve reliable UL Tx power via HS-SICH in a large cell, HSDPA operation in UTRA TDD can be severely compromised. So UTRA It is desirable to provide a mechanism for TDD that can accurately update the WTRU-specific target SIR value for HS-SICH operations.

<p><patcit num="1"><text>International Publication No. 02/09 311 Pamphlet</text></patcit><patcit num="2"><text>U.S. Patent Application Publication No. 09/904001</text></patcit></p>

<p><nplcit num="1"><text>3GPP TS25.223 v.3.3.0</text></nplcit><nplcit num="2"><text>3GPP TS25.222 v.3.2.0</text></nplcit><nplcit num="3"><text>3GPP TS25.224v.3.6</text></nplcit><nplcit num="4"><text>Association of Radio Industries Businesses (ARIB), Volume 3 specifications of Air-Interface for 3G Multiple System Version 1.0, Revision 1.0</text></nplcit></p>

The present invention provides controlled transmitter power to a wireless communication system in which both DCH (dedicated channel) and SCH (shared channel) are used. In one embodiment, the outer loop transmit power control of the wireless communication system is provided. In a wireless communication system, both the SCH available for wireless telecommunications (telecommunication) and the DCH assigned to use a specific WTRU via an unspecified WTRU (wireless transmit receive unit) , User data is signaled from the network unit, WTRU sends the data signal via UL DCH (uplink dedicated channel) and sporadically sends the data signal via the associated UL SCH (uplink shared channel). .. The network unit preferably associates a receiver that receives UL user data from the WTRU via the UL DCH and at least one UL SCH with a UL SCH that can be used by the WTRU. It has a processor that calculates a target metric for UL DCH based on the signal transmitted and received by the WTRU over the DCH. A SCH target metric generator configured to output each UL SCH target metric derived from each calculated UL DCH target metric is provided. Each WTRU preferably has a processor that computes the transmit power adjustment value as a function of the target metric for the UL channel. This WTRU processor is preferably UL DCH for UL DCH associated with UL SCH as a function of the UL DCH target metric calculated by the network unit based on the signal transmitted and received by WTRU via UL DCH. UL for the associated UL SCH as a function of each UL SCH target metric that computes the power adjustment and outputs from the SCH target metric generator. Configured to compute SCH power adjustments. Each WTRU also has a transmitter associated with the WTRU's processor operably, according to which user data corresponds to the respective UL DCH power adjustment and UL SCH power adjustments compiled. At each power level, it is transmitted via UL DC H and the associated UL SCH.

The target metric is preferably a target signal to interference ratio (SIR), and the communication system preferably has either open-loop transmit power control or closed-loop transmit power control for WTRU transmission. The present invention is a UMTS (Universal Mobile Telecommunications System), for example, a 3GPP R5 system, in which the SCH that generates the SCH target SIR operates in cooperation with the HS-DSCH (High Speed Downlink Shared Channels) HS-SICH. It is particularly suitable for implementation in 3GPP R5 systems (High Speed Shared Information Channels), but is not limited to this.

In one alternative, the network unit includes a SCH target metric generator. In this case, in an open loop system, the network unit preferably includes a transmitter configured to transmit the DCH target SIR and the SCH target SIR, and the processors of these WTRUs receive the received DCH. In order to calculate the power adjustment value based on the target SIR and SCH target SIR, these WTRUs include receivers configured to receive their respective DCH target SIRs and SCH target SIRs, respectively. preferable.

In a closed-loop system where the network unit contains a SCH target metric generator, the network unit is a function of the DCH target SIR calculated by the network unit's processor and the SCH target SIR generated by the SCH target metric generator. , DCH power step commands and components configured to generate SCH power step commands, and transmitters configured to transmit DCH power step commands and SCH power step commands. In order for the WTRU processor to calculate the power adjustment value based on the received DCH power step command and SCH power step command, the WTRU is given the respective DCH power step command and SCH power step command, respectively. It preferably includes a receiver configured to receive.

In another alternative, each WTRU contains a SCH target metric generator, where the target metric is the target SIR. If the communication system has an open-loop transmit power control for WTRU transmission, the WTRU processor is based on the received DCH target SIR and the WTRU SCH target metric generator based on the received DCH target SIR. In order to calculate the power adjustment value based on the generated SCH target SIR, the network unit contains a transmitter configured to transmit the DCH target SIR, and each WTRU has its own. It is preferred that a receiver configured to receive the DCH target SIR is included.

According to the present invention, a serving WTRU that implements transmit power control for a plurality of other WTRUs is provided. User data is signaled to serving WTRUs by multiple other WTRUs, both on UL SCHs available to unspecified WTRUs and on dedicated UL channels assigned to be used by specific WTRUs. A particular WTRU transmits a data signal via UL DCH and a data signal sporadically via an associated UL SCH. Each of the other WTRUs includes a processor that calculates the UL channel power adjustment value for the UL SCH associated with the UL DCH as a function of the UL target metric calculated by the serving WTRU. The serving WTRU is a receiver that receives UL user data from a UL DCH and multiple other WTRUs via at least one UL SCH, and via a UL DCH associated with a UL SCH that can be used by one WTRU. UL based on the signal transmitted and received by this WTRU It is preferred to include a processor that calculates the target metric for the DCH and a SCH target metric generator configured to output each UL SCH target metric derived from each calculated UL DCH target metric.

The target metric is preferably the target SIR. When the serving WTRU is used in UMTS, the serving WTRU is configured as a UTRAN (UMTS Terrestrial Radio Access Network) with either open-loop transmit power control or closed-loop transmit power control for WTRU transmission. The SCH that generates the SCH target SIR is preferably HS-SICH (High Speed Shared Information) that operates in cooperation with HS-DSCH (High Speed Downlink Shared Channels). Channels) is preferred. In an open loop system, this UTRAN preferably includes a transmitter configured to transmit the DCH target SIR and the HS-SICH target SIR. In this case, the other WTRUs calculate the power adjustment value based on the DCH target SIR and HS-SICH target SIR received from the UTRAN transmitter. In a closed-loop system, this UTRAN preferably includes the following components and transmitters: This component is configured to generate DCH power step commands and HS-SICH power step commands as a function of the DCH target SIR calculated by the processor and the HS-SICH target SIR generated by the SCH target metric generator. Has been done. This transmitter is configured to transmit DCH power step commands and HS-SICH power step commands, which allows multiple other WTRUs to receive DCH power step commands from the UTRAN transmitter and HS. -Calculate the power adjustment value based on the SICH power step command.

According to the present invention, the following WTRU for controlling transmission power is provided for a wireless communication system. That is, user data is signaled on both the SCH available to multiple unspecified WTRUs and the DCH assigned for the use of one particular WTRU, and this particular WTRU signals UL DCH. The data signal is transmitted via, and the data signal is transmitted sporadically via the associated UL SCH.

As such, the WTRU preferably includes the following receiver, SCH target metric generator, and processor. This receiver receives a target metric for UL DCH calculated based on the signal transmitted and received by WTRU over UL DCH. This SCH target metric generator is configured to output UL SCH target metrics derived from received UL DCH target metrics. The processor now calculates the UL DCH power adjustment value as a function of the received UL DCH target metric and the UL SCH power adjustment value as a function of the UL SCH target metric output from the SCH target metric generator. It is configured to calculate the power adjustment value as a function of the target metric. Since these target metrics are target SIRs, the processor calculates the power adjustment value based on the received DCH target SIR and based on the SCH target SIR generated by the WTRU's SCH target metric generator. Is preferable. This processor is a calculated UL A combiner configured to combine the DCH power adjustment value with the UL DCH transmission data signal for transmission by the WTRU, and the calculated UL SCH power adjustment value with the UL SCH transmission data signal for transmission by the WTRU. It is preferred that it be operably associated with a transmitter having a combiner configured to synthesize.

The advantage of the WTRU is that it is used in UMTS, which controls open-loop transmission power in transmission by WTRU, and the SCH in which the SCH target SIR is generated is HS-SICH that operates in cooperation with HS-DSCH. There is a point that can be configured to be.

In such cases, the processor bases the power adjustment value on the HS-SICH target SIR generated by the WTRU's SCH target metric generator based on the received DCH target SIR and the received DCH target SIR. It is preferable to calculate. In addition, the processor is configured to combine the calculated UL DCH power adjustment value with the UL DCH transmission data signal for transmission by WTRU, and the calculated UL HS-SICH power adjustment value is transmitted by WTRU. It is preferred that it be operably associated with a transmitter having a combiner configured to synthesize with a UL HS-SICH transmit data signal for.

An outer loop transmit power control method is provided for wireless communication systems, in which user data is allocated for SCHs available to unspecified WTRUs and for use with specific WTRUs. Signaled by both the DCH and this unspecified WTRU transmits the data signal via the UL DCH and sporadically via the associated UL SCH.

In one method, UL user data is received from multiple WTRUs via multiple UL DCHs and at least one UL SCH. Also, the target metric for the UL DCH is calculated by the network unit based on the signal transmitted and received by this WTRU via the UL DCH associated with the UL SCH available by the WTRU. Individual UL SCH target metrics are derived from each calculated UL DCH target metric. The UL DCH power adjustment value for UL DCH associated with UL SCH is calculated by each WTRU as a function of the UL DCH target metric calculated by the network unit based on the signal transmitted and received by WTRU over UL DCH. Will be done. The UL SCH power adjustment value for this associated UL SCH is calculated by each WTRU as a function of each UL SCH target metric output from the SCH target metric generator. User data on UL DCH and this associated UL User data on the SCH is transmitted by each WTRU at each UL DCH power adjustment value calculated and at each power level corresponding to the UL SCH power adjustment value. Individual UL SCH target metrics can be derived from each calculated UL DCH target metric, either by network unit or by WTRU. It is preferred that these target metrics are target SIRs. Also, for transmission by WTRU, an outer loop power control method can be implemented for either open loop transmit power control or closed loop transmit power control. The advantages of these methods can be implemented in UMTS, where the network unit is UTRAN and the SCH for which the SCH target SIR is generated is HS-SICH, which operates in collaboration with HS-DSCH. At the point.

The present invention includes a method of implementing transmission power control by a serving WTRU of a plurality of other WTRUs. That is, in this method, user data is collected by UL SCH, which is available to multiple unspecified WTRUs, and UL DCH, which is assigned to be used by one particular WTRU, by multiple other WTRUs. Signaled to serving WTRU. Also, in this method, this particular WTRU sends a data signal via UL DCH, sporadically sends a data signal through the associated UL SCH, and each of the other WTRUs. Compute the UL channel power adjustment value for UL DCH and the associated UL SCH, as a function of the UL target metric calculated by the serving WTRU. UL user data is received from multiple other WTRUs via UL DCH and at least one UL SCH. The target metrics for these multiple UL DCHs are ULs associated with UL SCHs that are available to WTRU. Calculated based on the signal transmitted and received by this WTRU via the DCH. Each UL SCH target metric generated is a calculated UL Derived from the DCH target metric. Preferably, the calculation and generation of the target metric includes the calculation and generation of the target SIR. The advantage of these methods is that the serving WTRU is configured as a UTRAN that implements open-loop transmit power control or closed-loop transmit power control for transmission by the WTRU, in which the SCH target SIR is generated. The SCH to be used is the HS-SICH that operates in cooperation with the HS-DSCH. In an open loop system, the DCH target SIR and HS-SICH target SIR are preferably transmitted, which allows multiple other WTRUs to be based on the DCH target SIR and HS-SICH target SIR received from the UTRAN. , Calculate the power adjustment value. In a closed-loop system, the DCH power step command and the HS-SICH power step command are preferably generated as a function of the DCH target SIR and the HS-SICH target SIR, with the DCH power step command and the HS-SICH power step command. Multiple other WTRUs transmitted and calculated the power adjustment value based on the DCH power step command and HS-SICH power step command received from UTRAN.

Also provided is a transmit power control method for the WTRU used in wireless communication systems. In this method, user data is signaled by the SCH available to multiple unspecified WTRUs and the DCH assigned for the use of one particular WTRU, and the WTRUs are data via UL DCH. Sends a signal and sporadically sends a data signal through the associated UL SCH. The target metric for UL DCH, which is calculated based on the signal transmitted and received via UL DCH by the WTRU, is received. A UL SCH target metric derived from the received UL DCH target metric is generated. The UL DCH power adjustment value is calculated as a function of the received UL DCH target metric, and the UL SCH power adjustment value is UL. Calculated as a function of the SCH target metric. Since the target metric is preferably the target SIR, the WTRU sets the power adjustment value based on the SCH target SIR generated by the WTRU based on the received DCH target SIR and the received DCH target SIR. Calculated, the WTRU synthesizes the calculated UL DCH power adjustment value with the UL DCH transmission data signal for transmission by the WTRU, and the calculated UL SCH power adjustment value is UL for transmission by the WTRU. Combine with SCH transmission data signal. The advantage of this method is that it can be implemented for use in UMST, which implements open-loop transmit power control for transmission by WTRU. In such cases, the SCH in which the SCH target SIR is generated is preferably the HS-SICH that operates in conjunction with the HS-DSCH, and the WTRU is the received DCH target SIR and the received. Based on the DCH target SIR and the HS-SICH target SIR generated by the WTRU, the power adjustment value is calculated and the calculated UL DCH power adjustment value is UL for transmission by the WTRU. Combine with the DCH transmission data signal and combine the calculated UL HS-SICH power adjustment value with the UL HS-SICH transmission data signal for transmission by WTRU.

Other objectives and advantages will be apparent to those skilled in the art based on the following description of current preferred embodiments of the present invention.

<tables num="1"><img file="JP4982520B2_D0001.tif" /></tables>

<figref num="1">It is a figure which shows the outline of the system architecture of the conventional UMTS network.</figref><figref num="2">FIG. 6 illustrates a conventional open power control system for wireless communication systems that implements outer loop power control with a target SIR metric.</figref><figref num="3">FIG. 6 illustrates a conventional closed power control system for wireless communication systems that implements outer loop power control with a target SIR metric.</figref><figref num="4">It is the schematic which shows the open power control system which concerns on this invention for wireless communication which uses both DCH and high-speed SCH.</figref><figref num="5">It is a schematic diagram which shows the alternative embodiment of the power control system which concerns on this invention for wireless communication which uses both DCH and high-speed SCH.</figref><figref num="6">It is the schematic which shows the closed power control system which concerns on this invention for wireless communication which uses both DCH and high-speed SCH.</figref>

In conventional power control methods for wireless systems such as 3GPP, so-called inner loops and outer loops are used. This power control system is called an open power control system when the inner loop is an open loop, and is called a closed power control system when the inner loop is a closed loop. In an open power control system, a system in which the inner loop is open, a system in which the inner loop is closed, and a closed power control system, the outer loop is a closed loop.

FIG. 2 shows the relevant part of an open power control system having a transmitter communication station 10 and a receiver communication station 30. Both stations 10 and 30 are transceivers. Typically, one is the base station, which is called node B in 3GPP, and the other is WTRU, which is called UE (user equipment) in 3GPP. For the sake of simplicity, the components shown are only selected. The present invention describes a preferred 3GPP system. However, the present invention is applied to all wireless communication systems, and is also applied to a system for ad hoc networking in which a plurality of WTRUs communicate with each other. Power control is important because it maintains the quality of signaling multiple users without excessive interference.

The transmitting side communication station 10 includes a transmitter 11 having a data line 12 for transporting a user data signal. To adjust the transmit power level, the user data signal is supplied with a desired power level, which is the output of processor 15. The obtained user data signal is transmitted from the antenna system 14 of the transmitter 11.

The wireless radio signal 20 including the transmitted data is received by the receiving communication station 30 via the receiving antenna system 31. The interfering radio signal 21 that affects the quality of the received data will also be received by the receiving antenna system 31. The receiving side communication station 30 includes an interference power measuring device 32, which inputs a received signal and outputs the measured interference power data. The receiving side communication station 30 includes a data quality measuring device 34, which also inputs a received signal and generates a data quality signal. The data quality measuring device 34 is coupled to a processing device 36, which receives signal quality data and has a target SIR (signal to interference) based on user-defined quality standard parameters received via the input terminal 37. ) Calculate the data.

The receiving communication station 30 includes a transmitter 38, which is coupled with an interferometric power measurement device 32 and a target SIR generator 36. The transmitter 38 of the receiving station includes an input terminal 40 for user data, an input terminal 41 for reference signals, and an input terminal 42 for reference signal transmission power data. The receiving side communication station 30 transmits the user data, the data related to control, and the reference signal via the antenna system 39.

The transmitting communication station 10 includes a receiver 16 and a receiving antenna system 17. The receiver 16 is a radio signal transmitted from the receiving side communication station 30, and includes user data 44 from the receiving side communication station 30 and control signals and control data 45 generated by the receiving side communication station 30. Receive a radio signal.

To compute the transmit power adjustment value, the transmitter processor 15 at the transmit station is associated with the receiver 16 at the transmit station. The transmitter 11 includes a device 18 that measures the received reference signal power and is associated with the path loss calculation circuit 19.

To compute the transmit power adjustment, processor 15 is generated by the target SIR data input terminal 22 for the target SIR data generated by the target SIR generator 36 of the receiving station and the interference power measuring device 32 of the receiving station. Data is received from the interference power data input terminal 23 for the interference data and the path loss data input terminal 24 for the path loss signal which is the output of the path loss calculation circuit 19. This path loss signal is a reference signal for the reference signal transmission power data whose source is the receiving side communication station 30, a reference signal for transmission power data input terminal 25, and a reference signal for the output of the reference signal power measurement device 18 of the transmitter 11. It is generated by the path loss calculation circuit 19 from the data received via the power input terminal 26 and. The reference signal measuring device 18 is coupled to the receiver 16 of the transmitting station and measures the power of the reference signal received from the transmitter 38 of the receiving station. The path loss calculation circuit 19 preferably calculates the path loss based on the difference between the known reference power signal strength from the input terminal 25 and the measured received power strength from the input terminal 26. ..

Interference power data and reference signal The power data and the target SIR value are signaled to the transmitting communication station 10 at a speed significantly lower than the speed that changes with the propagation channel and the time of interference. The "inner" loop is the part of the system that relies on the measured interface. The system is considered an "open loop". This is because the feedback to the algorithm, which indicates how much the minimum required transmitter power is estimated, is not provided at a speed comparable to the speed that varies with the propagation channel and the time of interference. If the required transmit power level changes rapidly, the system cannot change the power adjustment value in a timely manner in response to the change.

Regarding the outer loop of the open power control system of FIG. 2, the quality of the received data is evaluated by the measuring device 34 at the remote receiving side communication station 30. Typical metrics for digital data quality are bit error rate and block error rate. Calculation of these metrics requires data accumulated over a significantly longer period of time than the time-varying propagation channels and periods of interference. For any given metric, there is a theoretical relationship between this metric and the received SIR. When only enough data to evaluate this metric is accumulated in the remote receiver, the processor 36 calculates the metric and the desired metric (desired quality of service (QoS)). It is compared with (representing service)) and the updated target SIR is output. The updated target SIR is the (theoretical) value applied in the transmitter inner loop, which allows the measured metric to converge to the desired value. Finally, the updated target SIR is passed to transmitter 11 via transmitter 38 at the receiving station and receiver 16 at the transmitting station for use in the inner loop of transmitter 11. The target SIR update rate is limited by the time it takes to accumulate quality statistics and by the practical limits of the signal rate for power controlled transmitters.

FIG. 3 shows a communication system having a transmitting station 50 and a receiving station 70, which employs a closed power control system.

The transmitting station 50 includes a transmitter 51 having a data line 52 for transporting a user data signal. In order to adjust the transmission power level, this user data signal is supplied with the transmission power adjustment value from the output 53 of the processor 55. This user data is transmitted via the antenna system 54 of the transmitter 51.

The wireless radio signal 60 including the transmitted data is received by the receiving station 70 via the receiving antenna system 71. The interfering radio signal 61, which affects the quality of the received data, will also be received by the receiving antenna system 71. The receiving station 70 includes an interference power measuring device 72, which inputs a received signal and outputs measured SIR data. The receiving station 70 also includes a data quality measuring device 73, which inputs a received signal and generates a data quality signal. A processor 74 is coupled to the data quality measurement device 73, which receives signal quality data and targets SIR (signal to interference ratio) data based on user-defined quality standard parameters from input terminal 75. To calculate.

The combiner 76 compares the measured SIR data from the device 72 with the calculated target SIR data from the processor 74 and outputs a SIR error signal. The combiner 76 is preferably a constructor, in which case the measured SIR data from device 72 and the calculated target SIR data from processor 74 are subtracted to create a SIR error. Output a signal. The SIR error signal from the combiner 76 is input to the processing circuit 77, and the processing circuit 77 generates a step-up / down command based on the signal.

The receiving station 70 also includes a transmitter 78 coupled with a processing circuit 77. The transmitter 78 of the receiving station also includes an input terminal 80 for user data. The receiving station 70 transmits the user data of the station 70 and the control-related data via the antenna system 79.

The transmitting station 50 includes a receiver 56 and a receiving antenna system 57. The receiver 56 of the transmitting station receives the radio signal transmitted from the receiving station 70 and includes the user data 84 of the receiving station and the control data 85 generated by the receiving station.

The processor 55 of the transmitter of the transmitting station 50 has an input terminal 58 associated with the receiver 56 of the transmitting station 50. The processor 55 receives an up / down command signal via the input terminal 58, and computes a transmission power adjustment value based on the up / down command signal.

In the inner loop of the closed power control system, the transmitter 51 of the transmitting station 50 is based on the high rate "step up" and "step down" commands generated by the receiving station 70. Set the power. At the receiving station 70, the SIR of the received data is measured by the measuring device 72 and compared with the target SIR value generated by the processor 74 by the combiner 76. The target SIR is a (theoretical) value, but when data of that value is received, it provides the desired QoS. If the measured received SIR is less than the target SIR, a "step down" command is issued by processing circuit 77 via transmitter 78 at the receiving station and receiver 56 at the transmitting station. Is issued to, otherwise a "step up" command is issued. The power control system is considered a "closed loop". This is because the "step-up" command and the "step-down" command, which can respond in real time to the propagation channel and interference that change with time, are fed back at a high rate. If the required transmit power level changes due to time-varying interference and propagation, the power control system responds quickly and adjusts the transmit power in response to this change.

In the outer loop of the closed power control system, the quality of the received data is evaluated by the measuring device 73 at the receiving station 70. Typical metrics for digital data quality are the bit error rate and the block error rate. Computing these metrics requires data accumulated over a period of time significantly longer than the time-varying propagation channels and periods of interference. For any given metric, there is a theoretical relationship between the metric and the received SIR. When only data that can evaluate the metric is accumulated in the remote receiver, the processor 74 computes the metric, compares it with the desired metric (representing the desired QoS), and outputs an updated target SIR. The updated target SIR is a (theoretical) value that, when applied to the receiver algorithm, converges the measured metric to the desired value. To determine an indication of the step-up / down commands sent to the power scale generating processor 55 of the transmission station to control the power of the transmitter 51 because, the updated target SIR is used in the inner loop.

In both the open power control system and the closed power control system, the outer loop function of the transmitting side communication stations 10 and 50 observes the received transmission by the receiving side communication stations 30 and 70, for example, BLER ( It depends on observing the block-error rate) or observing the received SIR. If, for example, BLER becomes higher than the permissible value, for example, in 3GPP R5, BLER&gt; 0.1, and the user data becomes unusable due to too many errors, the transmitting side communication station 10, A larger target SIR is calculated for which 50 adjusts the transmit power. However, since the SCH (shared channel) is time-division, for example, in HS-SICH in 3GPP R5, if only a specific WTRU transmits sporadically in SCH, the WTRU-specific BLER or It becomes very difficult to observe the measured SIR at a frequency that ensures stable outer loop power control.

4, 5, and 6 show modified examples of conventional power control systems. In these modifications, an outer loop power control operation is provided for the SCH such as UL HS-SICH and the associated DCH (dedicated channel). These modifications have the advantage that the associated DCH can be observed more regularly. The target SIR of the associated DCH is used as the basis for the derivation to set the SCH metric, eg the target SIR. For example, the HS-SICH target SIR for a particular WTRU was associated. Derived according to the present invention from the target SIR calculated for DCH. This derivation is preferably based on a predetermined mathematical relationship. This pre-determined mathematical relationship can be simple and equal in the right circumstances. In this case, the same SIR calculated for DCH is used for HS-SICH power control. Alternatively, the mapping table can be used environment-based to derive the target SIR on HS-SICH from the target SIR applied via DCH. Therefore, if the target SIR of the DCH of a specific WTRU is changed, the target SIR of the HS-SICH of the WTRU is also updated accordingly in order to guarantee reliable operation.

During HSDPA operation of the 3GPP R5 system, the WTRU is in the CELL_DCH state, where the WTRU is a relatively slow duplex DCH because the RRC (radio resource control) signals control and user plane data. To use. All WTRUs associate such a slow DCH with the HS-SICH, where the outer loop power control is used to dynamically adjust the target SIR on the DCH to make this DCH. Use continuously (every 1 frame or every 2 frames) to ensure that UL's BLER and measured SIR are meaningful.

Even if the UL portion of HS-SICH and DCH may be allocated to different UL TS (uplink time slots), the associated target SIR on DCH correlates with the target SIR on HS-SICH. Is big. This is because the target SIR on the associated DCH depends primarily on the WTRU channel environment and WTRU rate, which are the same for both types of channels. Also, UL interference levels can be different in different TSs, but are already taken into account by other power control parameters that provide compensation for interference levels. Therefore, the present invention sets the required target SIR on UL HS-SICH for a particular WTRU using the target SIR on UL DCH that is accurately updated based on reliable outer loop power control capabilities. Or derive.

According to the present invention, an accurate target SIR can be obtained from the outer loop power control function that supervises the DCH operation. The HS-SICH processing gain and payload, required BLER, and DCH processing gain, payload, and required BLER are compared so that the recommended transmit power offset between the two channels. The basic principle is applied to derive. This derived offset can be performed at either the transmitting station or the receiving station, and in the preferred 3GPP R5 embodiment of HS-SICH, the transmitting station and the receiving station are on UE and UTRAN, respectively. Applicable.

4 and 5 are modified open power control systems for wireless communication systems, according to the teachings of the present invention. Components similar to the conventional system in Figure 2 are indicated by similar symbols. In ULSCH examples such as HS-SICH, transceiver 10 is a WTRU and component 30 represents a serving network such as 3GPP R5 UTRAN.

In the embodiments of FIGS. 4 and 5, the user data path of FIG. 2 carries the data of the DCH associated with the SCH. Data line 12 in FIG. 2 is for transporting user data from the WTRU and is shown as data line 12d in FIGS. 4 and 5 to represent the line for UL data on the DCH. In order to adjust the transmission power level, the UL DCH data signal is supplied with a desired power level from the output terminal 13d of the processor 15. The data line 40 in FIG. 2 is for transporting user data to the WTRU and is shown as line 40d in FIGS. 4 and 5 to represent the line for DL data on the DCH.

Data lines 12s are available to transport HS-SICH UL data on the WTRU10. To adjust the transmit power level, the UL-SICH data signal is supplied with the desired power level from the output 13s of processor 15. In the receiving side communication station 30, a receiver 46 is prepared to output separate DCH channels and HS-SICH channels.

The power adjustment value in the WTRU10 is performed by the processor 15 of the transmitter, but is performed in a manner customary for DCH and HS-SICH, respectively. The processor 15 receives data from the target SIR data input terminals 22d, 22s for the DCH target SIR data and the HS-SICH target SIR data to compute the individual transmit power adjustment values, and is operated by the interference power measuring device 32 of the receiving station. Data is received from the interference power data input terminal 23 for the generated interference data, and data is received from the path loss data input terminal 24 for the path loss signal which is the output of the path loss calculation circuit 19.

The target SIR DCH is preferably generated by a conventional method of assessing the quality of received DCH UL data via the measuring device 34. Typical metrics for digital data quality are bit error rate and block error rate. Computing these metrics requires data accumulated over a period of time significantly longer than the time-varying propagation channels and periods of interference. For any given metric, there is a theoretical relationship between the metric and the received SIR. When only data that can evaluate the metric is accumulated in the remote receiver, the metric is computed in processor 36, compared to the desired metric from input terminal 37 (representing the desired QoS), and the updated target SIR. DCH is output.

The updated target SIR is a (theoretical) value that, when applied to the transmitter inner loop, converges the measured metric to the desired value. Finally, the updated target SIR DCH is passed to transmitter 11 via transmitter 38 at the receiving station and receiver 16 at the transmitting station for use in the inner loop of the DCH. The update rate of the target SIR DCH is limited by the time required to accumulate quality statistics and by the practical limit of the signal rate for power controlled transmitters.

Due to the nature of HS-SICH being used sporadically and shared, it is impractical to attempt to calculate the target SIR for HS-SICH in a conventional manner. Therefore, the HS-SICH outer loop power control includes the HS-SICH target SIR derivation device 27, and the target SIR DCH is input to this HS-SICH target SIR derivation device 27 from the HS-SICH target SIR derivation device 27. The target SIR HS-SICH is output. The HS-SICH target SIR derivation device 27 extracts the relationship between the target SIR on the DCH and the target SIR on the HS-SICH from a 1: 1 or other predetermined mathematical relationship or a mapping table. It is preferable to set it as one of the above relationships.

FIG. 4 shows a preferred embodiment in which the HS-SICH target SIR derivation device 27 is included in the receiving communication station 30. When the present invention is implemented in a UMTS system, the transmitting side communication station 10 is preferably a WTRU and the receiving side communication station 30 is preferably a UTRAN network component. The target SIR HS-SICH is derived in UTRAN for use in the inner loop of HS-SICH and is derived from UTRAN transmitter 38 and WTRU receiver 16 to WTRU transmitter processor 15 via input terminal 22s. Passed.

FIG. 5 shows an alternative embodiment in which the HS-SICH target SIR derivation device 27 is included in the transmitting communication station 10. In this case, the target SIR DCH is passed through the receiver station transmitter 38 and the receiver 16 of the WTRU and supplied to the out-licensing device 27 in the transmitter 11 of the WTRU, where the out-licensing device 27 is of the HS-SICH. For use in the inner loop, the HS-SICH target SIR is derived and supplied to the processor 15 via the input terminal 22s.

FIG. 6 shows a modified closed power control system for a wireless communication system implemented in accordance with the teachings of the present invention, and similar components of the conventional system of FIG. 3 are similarly labeled. In ULSCH examples such as HS-SICH, transceiver 50 represents a WTRU and component 70 represents a service delivery network such as 3GPP R5 UTRAN.

In the embodiment of FIG. 6, the user data path of FIG. 3 transmits the data of the DCH associated with the SCH. The data line 52 in FIG. 3 transports user data from the WTRU, but is shown as line 52d in FIG. 6 to represent the line for UL data on the DCH. To adjust the transmit power level, the UL DCH data signal is supplied with the desired power level from the output 53d of processor 55. The data line 80 in FIG. 3 transports the user data to the WTRU, but is shown as the line 80d in FIG. 6 to represent the line for the DL data of the DCH.

In the embodiment of FIG. 6, data lines 52s are prepared to transport the UL data of HS-SICH in WTRU10. To adjust the transmit power level, the UL HS-SICH data signal is supplied with the desired power level from the output 53s of processor 55. At the receiving station 70, a receiver 86 is prepared to output DCH and HS-SICH. When the present invention is implemented in a UMTS system, the transmitting station 50 is preferably a WTRU and the receiving station 70 is preferably a network component of UTRAN.

The power adjustment value in the WTRU50 performed by the processor 55 of the transmitter is preferably performed by the conventional method of DCH and HS-SICH. The processor 55 receives each up / down command signal via the input terminals 58d and 58s, and computes each transmission power adjustment value based on the signal.

In the inner loop of the closed power control system, the transmitter 51 of the transmitting station is based on the high rate "step up" and "step down" commands generated by the receiving station 70. Set the power. At the receiving station 70, the SIR of the received DCH data is measured by the measuring device 72 and compared with the target SIR DCH value generated by the processor 74 by the combiner 76d. Temporarily measured received SIR DCH is the target SIR If it is less than DCH, a DCH "step down" command is issued by processing circuit 77, via transmitter 78 at the receiving station and receiver 56 at the transmitting station, and transmitter via input terminal 58d. Passed to 51, otherwise a DCH "step up" command is issued. Power control systems are considered "closed loops". This is because it provides high-rate feedback of "step-up" and "step-down" commands that can respond in real time to time-varying propagation channels and interference. If the required transmit power level changes due to time-varying interference and propagation, the power control system responds quickly and adjusts the transmit power accordingly.

In the outer loop of the closed power control system of FIG. 6, the quality of the received DCH is evaluated by the measuring device 73 at the receiving station 70. Typical metrics for digital data quality are bit error rate and BLER. Calculation of these metrics requires data accumulated over a period significantly longer than the time-varying propagation channels and periods of interference. For any given metric, there is a theoretical relationship between the metric and the received SIR DCH. When only data that can evaluate the metric is accumulated in the remote receiver, the processor 74 calculates the metric, compares it with the desired metric (representing the desired QoS), and outputs an updated target SIR DCH. .. An updated target SIR DCH is used in the inner loop to control the power of the transmitter 51 to determine the DCH step-up / down command instructions sent to the power adjustment value generator 55 of the transmitting station.

Due to the nature of HS-SICH being used sporadically in common, it is impractical to attempt to calculate the target SIR for HS-SICH in a conventional manner. Therefore, FIG. 6 shows a preferred embodiment, in which the outer loop power control for HS-SICH includes the HS-SICH target SIR derivation device 87 and the HS-SICH target SIR derivation device 87. The target SIR DCH is input to, and the target SIR HS-SICH is output. The HS-SICH target SIR derivation device 27 preferably sets the relationship between the target SIR on the DCH and the target SIR on the HS-SICH to a 1: 1 or other predetermined mathematical relationship. It is preferable to set the relationship taken from the mapping table. The target SIR HS-SICH generated by device 87 and compared to the SIR of the received DCH via the combiner 76s is measured by measuring device 72 or a derivative of measuring device 72. Alternatively, the SIR of the received HS-SICH is measured and the target SIR Compared to HS-SICH. If the compared values are less than the target SIR HS-SICH, the HS-SICH "step down" command is issued by processing circuit 77 and by transmitter 78 at the receiving station and receiver 56 at the transmitting station. It is sent to the transmitter 51 via the input terminal 58s, otherwise the HS-SICH "step up" command is issued.

Therefore, as mentioned above, the reliable outer loop power control function on HS-SICH is implemented to improve the radio resource utilization efficiency of HSDPA of UTRA TDD. Thus, the present invention provides a new relationship between a particular WTRU and, for all uses of these WTRUs, a target SIR setting on the DCH and a target SIR setting on the HS-SICH.

In the above description, HSDPA in UTRA TDD has been described, but this is only an example and is not limited to this. The present invention is also applicable to other wireless communication systems including DCH and SCH. Other modified forms and modified forms suitable for the present invention are of course to those skilled in the art.