Wireless transmit receive unit (WTRU) for implementing transmission power control for a transmitting WTRU as a function of data block allocation

A wireless transmission and reception unit that transmits WTRUs and implements transmission power control based on data block allocation history and time interval as a function

[Creative collar

This creative department is about wireless communication systems. In particular, this author is concerned with the power control of this type of wireless communication system.

[Creation Back

The wireless telecommunication system is a known technology in the creative field. In order to provide global connectivity for wireless systems, wireless telecommunication systems develop or implement various industry standards. In broadband applications, an existing industry standard is called the Global System for Mobile Telecommunications (GSM). This industry standard is the so-called second-generation mobile wireless system standard (2G), and its revised industry standard is the so-called 2.5G mobile wireless system standard. In the second and fifth generation mobile wireless system standards (2.5G), the overall packet radio service (GPRS) and the enhanced data overall packet radio service environment (EDGE) are two representative technologies, which are compared with the second-generation mobile radio The system standard (2G) Global Mobile Telecommunications System (GSM) network can provide higher-speed data services. Among these industry standards, various industry standards will provide additional features and improvements to improve the shortcomings or deficiencies of the conventional industry standards. In January 1998, the European Telecommunications Standards Institute-Special Operations Group (ETSI-SMG) has reached a consensus on the wireless access method of the third-generation wireless system, which is the so-called Universal Mobile Telecommunications System (UMTS). In order to further implement this Universal Mobile Telecommunications System (UMTS) standard, the Third Generation Partnership Project (3GPP) was established in December 1998, and the Third Generation Partnership Project (3GPP) continued to promote the Three generations of mobile wireless standards.

Figure 1 shows a typical Universal Mobile Telecommunications System (UMTS) system architecture, which complies with the current Third Generation Partnership Project (3GPP) specifications. This Universal Mobile Phone Service (UMTS) network architecture has a core network (CN) through an interface called Iu, through which The network architecture has a core network (CN), which is connected to a universal mobile phone service (UMTS) surface radio access network (UTRAN) via an interface called Iu. The interface is defined in detail in the currently publicly available 3rd Generation Partnership Project (3GPP) specification documents. This Universal Mobile Phone Service (UMTS) Surface Radio Access Network (UTRAN) is through a wireless interface called Uu, through a wireless transmission and reception unit (WTRU), which is in the current 3rd Generation Partnership Project (3GPP) specifications The Chinese system is called User Equipment (UE), which provides wireless telecommunication services to users. This Universal Mobile Phone Service (UMTS) Surface Radio Access Network (UTRAN) has a single or several radio network controllers (RNC) and base stations. It is in the current Third Generation Partnership Project (3GPP) specifications. Known as Node B, it collectively provides geographic coverage for wireless communication with user equipment (UE). Single or multiple B Nodes are respectively connected to each radio network controller (RNC) through an interface called Iub in the current 3rd Generation Partnership Project (3GPP) specifications. This Universal Mobile Phone Service (UMTS) Surface Radio Access Network (UTRAN) can have several groups of Node Bs, which are connected to different radio network controllers (RNC), as shown in Figure 1. The example of is a node B with two groups. When a universal mobile phone service (UMTS) surface radio access network (UTRAN) provides more than one radio network controller (RNC), the communication between the radio network controllers (inter-RNC) is through a method called Iur's interface execution.

The external communication of these network components is performed through this Uu interface, based on a user level using these B-nodes, and via various core network connections of external systems, based on a network level using this core network. .

Generally speaking, the main function of a base station (such as Node B) is to provide these base stations (BS) A wireless connection between the network and these wireless transmitting and receiving units (WTRU). Typically, a Node B transmits a shared channel signal so that the unconnected wireless transmission and reception unit (WTRU) can synchronize with the timing of the base station (BS). In the current 3rd Generation Partnership Project (3GPP), a Node B system performs physical wireless connections with these user equipment (UE). The node B receives the signal on the Iub interface through the radio network controller (RNC), so as to control the wireless signal transmitted by the node B on the Uu interface.

A core network (CN) is responsible for routing information to its correct destination. For example, this core network (CN) can route a user equipment (UE) voice communication, which uses this universal mobile telecommunications service (UMTS) to receive via a certain B node and route it to a public switched telephone Packet data scheduled for the network (PSTN) or the Internet (the Internet). In the current Third Generation Partnership Project (3GPP), this core network (CN) system has six main components, including: (1) a service general packet radio service (GPRS) support node; (2) a Gateway General Packet Radio Service (GPRS) support node; (3) a border gateway; (4) a visitor location register; (5) a mobile service switching center; and (6) a gateway mobile service switching center . This service General Packet Radio Service (GPRS) support node provides access to packet-switched network domains, such as the Internet. The Gateway General Packet Radio Service (GPRS) support node is a gateway node connected to other networks. Go to other operators networks or the Internet (the All data communications on the Internet will pass through this gateway General Packet Radio Service (GPRS) support node. This border gateway acts as a firewall to prevent intruders from outside the network from attacking internal users in this network area. This visitor location register is an existing service network "copy" of the user data needed to provide the service. This information It is taken from a database in charge of mobile users. This mobile service switching center is responsible for the "circuit switched" connection of Universal Mobile Telecommunications Service (UMTS) terminals to this network. This gateway mobile service switching center implements the required routing functions based on the user's existing location. In addition, this gateway mobile service switching center can also receive and supervise connection requests from external network users.

Generally speaking, these radio network controllers (RNC) control the internal functions of the Universal Mobile Telecommunications Service (UMTS) Surface Radio Access Network (UTRAN). In addition, these radio network controllers (RNC) can also provide relay communication services, which have: a regional element connected via a Uu interface with a B node, and via the core network (CN) and a An external service component of a connection between external systems, for example, an international call made by a mobile phone of a domestic universal mobile telecommunications service (UMTS) surface radio access network (UTRAN).

Typically, a radio network controller (RNC) monitors a plurality of base stations (BS), manages the wireless service coverage of these base stations (BS) and covers the geographic area, and controls the physical wireless resources of the Uu interface. In the current 3rd Generation Partnership Project (3GPP), the Iu interface of a radio network controller (RNC) provides two connections to the core network (CN), one of which is connected to a packet exchange Network domain, and another connection leads to a circuit-switched network domain. Other important functions of these radio network controllers (RNC) include: confidentiality and integrity protection.

In this creative field, many wireless communication systems use adaptive power control algorithms. In this type of wireless communication system, many communication systems can share the same wireless spectrum. When receiving a particular communication, all other communications using the same frequency spectrum will interfere with this particular communication. Disturb. Therefore, increasing the transmission power level of a certain communication may cause the signal quality of all other communications within this spectrum to decrease. However, excessive reduction of this transmission power level may also result in extremely undesirable signal quality at the receiver, such as the quality measured by the signal-to-interference ratio (SIR).

In addition, in this creative field, wireless communication systems have various power control methods. For example, Figures 2 and 3 respectively show an open loop power control transmitter system and a closed loop power control transmitter system of a wireless communication system. The purpose of this type of wireless communication system is to rapidly change the transmitter power when the diminishing transmission channel and time-varying interference occurs, thereby minimizing the transmitter power and ensuring that considerable quality data can be received at the remote end.

In communication systems such as the Third Generation Partnership Project (3GPP) Time Division Duplex (TDD) system and the Third Generation Partnership Project (3GPP) Frequency Division Duplex (FDD) system, the sharing of several variable data rates Channels and dedicated channels are combined for the purpose of data transmission. The background specifications of this type of wireless communication system can be found in 3GPP TS 25.223 v3.3.0, 3GPP TS 25.222 v.3.2.0, 3GPP TS 25.224 v3.6, and Volume 3 specification of Air-Interface for 3G Multiple System Version 1.0, The first revised version provided by the Association of Wireless Industries (ARIB). In response to changes in the data rate, a fast power control adaptation method and system that can achieve better performance is found in the international publication number WO 02/09311 A2. Its announcement date is January 31, 2002, and corresponds to The US Patent Application No. 09/904001, whose filing date is July 12, 2001, is also owned by the grantee of this creation.

In the Third Generation Partnership Project (3GPP) Wideband Code Division Multiple Access (W-CDMA) system, power control is used as a link adaptation method. Dynamic power control system applied to dedicated entities Channel (DPCH), so that the transmission power of these dedicated physical channels (DPCH) can reach the minimum transmission power level of quality of service (QoS), thereby limiting this third-generation cooperative project (3GPP) broadband code division multiple access (W-CDMA) Interference level inside the system.

A power control method is to divide the transmission power control into independent programs, which are called external loop power control (OLPC) and internal loop power control (ILPC). According to whether this internal loop is open or closed, this power control system can usually be called an open power control system or a closed power control system. In the examples shown in Figures 2 and 3, the external loops of the two types of power control systems are closed loops. In addition, in the example shown in Figure 2, the internal loop of this type of power control system is an open loop.

In the external loop power control, the power level of a particular transmitter depends on a target signal-to-interference ratio (SIR) value. When a receiver receives these transmissions, the quality of the received signal is measured. This transmission information is transmitted in units of transmission blocks (TB), and the quality of the received signal can be monitored based on the block error rate (BLER). The block error rate (BLER) is predicted by the receiver, which is usually predicted by the cyclic redundancy check (CRC) of this data. This predicted block error rate (BLER) will be compared with a certain target quality requirement, such as a certain target block error rate (BLER), which represents the quality of service (QoS) of various data service types on this channel. )Require. Based on the measured received signal quality, a target signal-to-interference ratio (SIR) adjustment control signal will be transmitted to the transmitter. Subsequently, the transmitter can request the target signal-to-interference ratio (SIR) adjustment based on these adjustments.

In the third-generation partnership project (3GPP) using Time Division Duplex (TDD) mode, there are many wide-band code divisions In the W-CDMA system, this Universal Mobile Telecommunications Service (UMTS) Surface Radio Access Network (UTRAN) (Serving Radio Network Controller-Radio Resource Controller (SRNCC-RRC)) will call/ When the dialog is established, the initial target signal-to-interference ratio (SIR) is set to the wireless transmission and reception unit (WTRU), and then, during the full life of the call, based on the uplink circuit (UL) block error rate (BLER) Observing the measurement, continuously adjust the target signal-to-interference ratio (SIR) of the wireless transmission and receiving unit (WTRU).

In the internal loop power control, the receiver compares the received signal quality (such as the signal-to-interference ratio (SIR)) with a certain threshold value (that is, the target signal-to-interference ratio (SIR)). If the signal-to-interference ratio (SIR) exceeds this critical value, a transmit power command (TPC) will be sent to reduce the power level. Conversely, if the signal-to-interference ratio (SIR) is less than the critical value, a transmit power command (TPC) will be sent to increase the power level. Typically, the transmit power command (TPC) will be multiplexed to the transmitter using data from a dedicated channel. In response to the received transmission power command, the transmitter can change its transmission power level.

Conventionally, in a third-generation cooperative project (3GPP) communication system, this external loop power control algorithm assumes certain channel conditions and uses the block error rate (BLER) and signal-to-interference ratio (SIR) relationship Set the starting target signal-to-interference ratio (SIR) of each coded composite transmission channel (CCTrCH) according to the required target block error rate (BLER). A coded composite transmission channel (CCTrCH) usually multiplexes several transmission channels (TrCH) to transmit various services on a certain physical wireless channel, and various services are transmitted on its own transmission channel (TrCH). In order to synthesize the transmission channel according to the code (CCTrCH) Based on the block error rate (BLER) level monitoring, this considers that a reference transmission channel (RTrCH) can be selected from the multiplex transmission channel (TrCH) of the coding composite transmission channel (CCTrCH). For example, the transmission channel (TrCH-1) can be selected as the reference transmission channel (RTrCH), and can be regarded as the coded composite transmission channel (CCTrCH), all channel conditions (including: additive Gaussian noise) (AGWN) channel). According to the given channel conditions, the mismatch between a target block error rate (BLER) and a target signal-to-interference ratio (SIR) may vary greatly, especially in the case of extremely low block error rate (BLER). For example, when the target block error rate (BLER) is equal to 0.01, the target signal-to-interference ratio (SIR) of the transmission channel (TrCH-1) of the channel condition in the first case (Case 1) is compared to the additive Gaussian The target signal-to-interference ratio (SIR) of another transmission channel of the noise (AWGN) channel condition may need to be increased by 4 dB (that is: the transmission channel (TrCH-1) will require a stronger signal). When the wireless transmission and receiving unit (WTRU) wants to convert the target block error rate (BLER) to a certain initial target signal-to-interference ratio (SIR), a mismatch of the channel conditions may cause an error, because a certain The target signal-to-interference ratio (SIR) required for a target block error rate (BLER) will vary with channel conditions. Therefore, the iterative procedure for determining the target signal-to-interference ratio (SIR) will have an initial difference, which must converge to the required target, and allow the execution of the cyclic redundancy check (CRC) procedure to make the target signal-to-interference ratio (SIR) (SIR) There is an undesirable delay in convergence.

Due to the effect of this delay, the performance of the entire power control algorithm will be reduced. This delay can be expressed in units of transmission rate, that is, transmission time interval (TTI). The smallest unit of transmission time interval is a data frame. In the 3rd Generation Partnership Project (3GPP) communication system, This minimum transmission time interval is usually defined as 10ms. In a third-generation cooperative project (3GPP) communication system, the length of this transmission time interval (TTI) is 10ms, 20ms, 40ms, or 80ms.

In addition, a wireless channel can also transmit various services, such as video, voice, and data. Among them, various services have different quality of service (QoS) requirements. For non-real-time (NRT) data services, data will be transmitted using many short-term bursts. For example, in a third-generation cooperative project (3GPP) communication system, these data bursts are mapped to a temporary dedicated channel (Temp-DCH) in the form of transmission blocks. This mapping action can also be referred to as Temp-DCH setting. In each transmission time interval (TTI), a single or several transmission blocks are mapped to this temporary dedicated channel (Temp-DCH). Therefore, each service will be mapped in several transmission time intervals (TTI), and during the external loop power control (OLPC) period, the target signal-to-interference ratio (SIR) adjustment system for these temporary dedicated channels (Temp-DCH) is adjusted. This is done on the basis of the transmission time interval (TTI).

When comparing voice and data type transmissions, a real-time (RT) voice transmission may require a better tolerance target block error rate (BLER) (that is, a higher block error rate (BLER) value), In contrast, a non-real-time (NRT) data transmission may require a target block error rate (BLER) with a lower error rate. Therefore, when downloading data, the expected delay for ensuring quality of service (QoS) will be longer, compared to the expected delay for voice transmission. In addition, the size of the transient step required for target signal-to-interference ratio (SIR) adjustment can be set according to the quality of service (QoS) requirements of this service. The starting target signal-to-interference ratio (SIR) of real-time (RT) data will always converge to the ideal target signal-to-interference ratio (SIR). In contrast, The initial target signal-to-interference ratio (SIR) of non-real-time (NRT) data is re-assigned when each temporary dedicated channel (Temp-DCH) is set. Due to the short period of temporary dedicated channel (Temp-DCH) setting, May not converge to the ideal target signal-to-interference ratio (SIR).

In view of this, the author uses the temporary dedicated channel (Temp-DCH) setting period as an additional parameter to enhance power control.

[Creation Overview]

A transmission power control method, suitable for a wireless transmission and reception unit (WTRU), this wireless transmission and reception unit (WTRU) can use selective size block settings to transmit data signals in a forward channel, where The wireless transmission and reception unit (WTRU) is based on the architecture so that the forward channel power is adjusted as a function of the target metric. The target metric is calculated based on the data signals received on the forward channel. In addition, this transmission The power control method includes the following steps. First, on this forward channel, a series of data signal block settings are received at intervals of time via the wireless transmission and receiving unit (WTRU), wherein each data signal block setting has a predetermined size S. For the data signal set in each block, the target metric calculation of the forward channel power adjustment of the wireless transmission and receiving unit (WTRU) is based on the detection of the predetermined error conditions of the received signals on the forward channel. Including: setting an initial target metric value set by each data signal block, and storing a final target metric set by each data signal block. After the first block is set, for the data signal set in each block, the initial target metric value will be set to the last target metric set in the previous block and adjusted based on the mutual setting of the interval time set in the previous block A function. After an initial period of this starting value, this The target metric, in a time interval of a predetermined length, will change the number of upward levels or the number of downward levels, by which the target metric can increase the number of upward levels, if a predetermined error condition has been detected in the previous time interval Or, this target metric can reduce the number of downward steps if the predetermined error condition is not detected in the previous time interval. Setting the number of downward steps to a transient state level is based on the predetermined block setting size S, so that the number of starting downward steps can be set at a level, and this level is at least not less than A predetermined number of downward steps for a steady state level. When the number of starting downward steps is greater than the predetermined number of downward steps in the steady state level, the number of downward steps will be reduced by a selected value to a lower level, if a predetermined error has been detected in the previous time interval Condition, until the number of downward ranks can be reduced to the predetermined number of downward ranks at this steady-state level.

A receiving wireless transmission and reception unit (WTRU) to implement the transmission power control of a transmission wireless transmission and reception unit (WTRU), where the transmission wireless transmission and reception unit (WTRU) can be configured with blocks of selective size Each block is set to have a predetermined size S, and the data signal is transmitted in a forward channel. Among them, the transmission wireless transmission and reception unit (WTRU) is structured so that the forward channel power is adjusted as a function of the target metric , The target metric is calculated using the receiving wireless transmission and reception unit (WTRU). The receiving wireless transmission and receiving unit (WTRU) has the following elements. A receiver is on this forward channel and receives a series of data signal block settings at intervals of time via this wireless transmission and reception unit (WTRU). A processor architecture calculates the target metric, which is based on the detection of the predetermined error conditions of the received signals on the forward channel, Implement the forward channel transmission power adjustment of this transmission wireless transmission and receiving unit (WTRU). This processor can also be configured to calculate the target metric. In this way, for the data signal set in each block, each data signal block setting can set an initial target metric value, and each data signal block setting can be stored A final target metric value. In addition, this processor can also be further structured, whereby after the first block is set, for the data signals set in each block, the initial target metric value will be set to the last target metric set in the previous block and A function based on the mutual setting adjustment with the previous block setting interval time. After an initial period of time from the starting value, the target metric will change an upward class number or a downward class number at a time interval of a predetermined length, whereby the target metric can increase the upward class number. If a predetermined error condition has been detected in the previous time interval, or, the target metric can reduce the number of downward steps, if the predetermined error condition has not been detected in the previous time interval. The number of descending levels is based on the predetermined block setting size S, so as to be set at a transient state level. In this way, the number of starting descending levels can be set at a level, which is at least not less than a steady state. A predetermined downward level of the level, and when the starting downward level is greater than the predetermined downward level of the steady state level, the downward level will be reduced by a selected value to a lower level , If a predetermined error condition has been detected in the previous time interval, until the number of downward steps can be reduced to the predetermined number of downward steps at the steady state level.

[Brief description of the attached drawings]

Figure 1 is a schematic diagram showing the system architecture of a conventional Universal Mobile Telecommunications System (UMTS) network; Figure 2 is a schematic diagram showing a conventional open loop power control system for a wireless communication system, which implements external loop power control via a target signal-to-interference ratio (SIR) measurement; Figure 3 shows a conventional A schematic diagram of a closed loop power control system for a wireless communication system, which implements internal loop power control through a target signal-to-interference ratio (SIR) measurement; Figure 4 is a schematic diagram showing the target signal-to-interference ratio (SIR) adjustment, It is based on a hopping algorithm that can be applied to the downlink open loop power control (OLPC); Figure 5 shows the target signal-to-interference ratio of the wireless transmission and receiving unit (WTRU) downlink open loop power control (OLPC) according to this creative example (SIR) adjustment diagram; Figure 6 is a diagram showing the target signal-to-interference ratio (SIR) adjustment of the wireless transmission and receiving unit (WTRU) downlink open loop power control (OLPC) according to this creative example, where the wireless transmission and The receiving unit (WTRU) downlink open loop power control (OLPC) has a compressed transient state; Figures 7A to 7C are a flow chart showing the method of downlink open loop power control (OLPC) algorithm according to this creative example; and eighth The figure shows a flowchart of the method for enhancing the open loop power control (OLPC) algorithm based on the non-real-time data created by this article.

[Detailed Description of the Preferred Embodiment]

This creation is described in detail with the accompanying drawings, in which similar schematic symbols indicate similar elements. The terms base station (BS), wireless transmission and reception unit (WTRU), and mobile unit have broad meanings. In this authoring description, the term "base station" includes, but is not limited to, base stations, Node Bs, location controllers, access points, or other interface devices capable of operating in a wireless environment. This allows the wireless transmission and reception unit (WTRU) to wirelessly access the associated network of the base station.

In addition, in this authoring description, the term "wireless transmission and reception unit (WTRU)" includes, but is not limited to, user equipment (UE), mobile station, fixed or mobile subscriber unit, pager, or capable of operating in a wireless Any other type of device for the environment. The wireless transmission and reception unit (WTRU) has a personal communication device, such as a telephone, a video phone, and an Internet phone with a network connection. In addition, the wireless transmission and reception unit (WTRU) also has a portable personal computing device, such as a personal digital assistant (PDA) and a notebook computer with a wireless modem (with similar network functions). A wireless transmission and reception unit (WTRU) that can be carried or can be changed location may be referred to as a mobile unit.

Although the preferred embodiment of this creation is described in conjunction with the Third Generation Partnership Project (3GPP) Wideband Code Division Multiple Access (W-CDMA) system in time-sharing duplex (TDD) mode, the preferred embodiment of this creation It can also be applied to any hybrid code division multiple access (CDMA)/time division multiple access (TDMA) communication system. In addition, the preferred embodiment of this creation can also be applied to other code division multiple access (CDMA) systems, such as: Frequency Division Duplex (FDD) mode of the Third Generation Partnership Project (3GPP) Broadband Code Division Multiple Access ( W-CDMA) system.

The conventional power control method of wireless communication systems (such as the 3rd Generation Partnership Project (3GPP) wireless communication system) uses so-called internal loops and external loops. According to whether this internal loop is open or closed, this power control system can be called an open power control system or a closed power control system. In addition, the external circuits of these two types of systems are closed circuits.

Figure 2 shows the relevant parts of an open loop power control system, which has a " A "transmitting" communication station 10 and a "receiving" communication station 30. The two communication stations 10 and 30 are both transceivers. Typically, a communication station represents a base station, which is in the 3rd Generation Partnership Project (3GPP) system It may be called a Node B, and another communication station represents a type of wireless transmission and reception unit (WTRU), which may be called a user equipment (UE) in the 3rd Generation Partnership Project (3GPP) system. For the sake of brevity, this creation only represents selected components, and this creation is explained in conjunction with the 3rd Generation Partnership Project (3GPP) system. However, this creation can also be applied to other wireless communication systems, even for implementation of special networks. In a system that is connected to each other, wireless transmission and reception units (WTRU) can communicate with each other. Without causing additional interference, power control is an important factor in maintaining the quality of signal transmission for multiple users.

The transmission communication station 10 has a transmitter 11, wherein the transmitter 11 has a data line 12 to transmit a user data signal. The user data signal has an ideal power level, and the power level is adjusted by applying a transmission power adjustment via an output 13 of a processor 15. The user data signal is transmitted via an antenna system 14 of the transmitter 11.

A wireless signal 20 containing the transmission data passes through a receiving antenna system 31, and is received by the receiving communication station 30. The receiving antenna system 31 may also receive the interfering wireless signal 21, thereby affecting the quality of the received data. The receiving communication station 30 has an interference power measuring device 32 for inputting the received signal and outputting the measured interference power data. The receiving communication station 30 also has a data quality measuring device 34 for inputting the received signal and outputting a data quality signal. The data quality measuring device 34 is coupled to a processing device 36 to receive the signal quality data, and based on a The user defines the quality standard parameters (received via an input 37) and calculates the target signal-to-interference ratio (SIR) data.

The receiving communication station 30 also has a transmitter 38 which is coupled to the interference power measuring device 32 and the target signal to interference ratio (SIR) generating processor 36. The transmitter 38 of the receiving communication station 30 also has inputs 40, 41, 42 which receive user data, reference signals, and reference signal transmission power data, respectively. The receiving communication station 30 is connected to an antenna system 39 to transmit user data and control related data and reference signals.

The transmission communication station 10 has a receiver 16 and an associated antenna system 17. The receiver 16 of the transmitting communication station 10 receives the transmitted wireless signal by the receiving communication station 30, and it has the user data 44 of the receiving communication station 30 and the control signals and data 45 generated by the receiving communication station 30.

The transmitter processor 15 of the transmission communication station 10 is connected to the receiver 16 of the transmission communication station 10 to calculate a transmission power adjustment. The transmitter 11 also has a device 18 for measuring the power of the received reference signal, and the device 18 is connected to the path loss calculation circuit 19.

In order to calculate the transmission power adjustment, the processor 15 receives data from a signal-to-interference ratio (SIR) data input 22 that carries the target signal-to-interference ratio (SIR) generation processor 36 of the receiving communication station 30. The target signal to interference ratio (SIR) data, and the data received by an interference power data input 23, which carries the interference data generated by the interference power measuring device 32 of the receiving communication station 30, and, by a path loss data The input 24 receives data, and the input 24 carries the path loss information output by the path loss calculation circuit 19 No. The path loss signal is generated from the received data of a reference signal transmission power data input 25 using the path loss calculation circuit 19, and the input 25 carries the output of the reference signal power measurement device 18 of the transmitter 11. The reference signal measuring device 18 is coupled to the receiver 16 of the transmitting communication station 10 to measure the power of the reference signal (received by the transmitter 38 of the receiving communication station 30). The path loss calculation circuit 19 is preferably based on the difference between the known reference power signal strength (transmitted by the input 25) and the measured received power strength (transmitted by the input 26) to determine the path loss.

The interference power data, the reference signal power data, and the target signal-to-interference ratio (SIR) value will be sent to the transmission communication station 10, and the rate is significantly lower than the time variation rate of the transmission channel and the interference. This "internal" loop is a part of the system that relies on this measurement interference. Because of this algorithm, the equivalent rate of the time change rate of the transmission channel, and the prediction accuracy of the minimum required transmission power rate and interference, there is no feedback, this kind of system can be called "open loop". If the transmission power level needs to be changed quickly, the system will not be able to respond and change the power adjustment in time.

According to the external loop of the open loop power control system in FIG. 2, at the remote receiving communication station 30, the quality of the received data can be evaluated by the measuring device 34. Typical metrics for digital data quality are bit error rate (BER) and block error rate (BLER). The calculation of these metrics requires accumulated data for a certain time period, where this time period is significantly greater than the period of time change transmission and interference. For any given metric, there will be a theoretical relationship between this metric and the received signal-to-interference ratio (SIR). When the remote receiver has accumulated enough data to evaluate this metric, this metric will be calculated by the processor 36, and, in line with this ideal Metrics (representing the ideal quality of service (QoS)) are compared to output an updated target signal-to-interference ratio (SIR). This updated target interference ratio (SIR) value, when applied to the internal loop of the transmitter, theoretically makes the measurement metric converge to the ideal value. Finally, the updated target signal-to-interference ratio (SIR) is transmitted to the transmitter 11 via the transmitter 38 of the receiving communication station 30 and the receiver 16 of the transmitting communication station 10 for use in its internal loop. The update rate of the target signal-to-interference ratio (SIR) is limited by the time required for cumulative quality statistics and the upper limit of the actual transmission rate of the power control transmitter.

Please refer to FIG. 3, which shows a communication system using a closed loop power control system. The communication system has a transmission communication station 50 and a receiving communication station 70.

The transmission communication station 50 has a transmitter 51, wherein the transmitter 51 has a data line 52 for transmitting a user data signal. The user data signal has an ideal power level, and the power level is adjusted by applying a transmission power adjustment via an output 53 of a processor 55. The user data signal is transmitted via an antenna system 54 of the transmitter 51.

A wireless signal 60 containing the transmission data passes through a receiving antenna system 71, and is received by the receiving communication station 70. The receiving antenna system 71 may also receive the interfering wireless signal 61, thereby affecting the quality of the received data. The receiving communication station 70 has an interference power measuring device 72 for inputting the received signal and outputting the measured signal to interference ratio (SIR) data. The receiving communication station 70 also has a data quality measuring device 73 for inputting the received signal and outputting a data quality signal. The data quality measuring device 73 is coupled to a processor 74 to receive the signal quality data, and based Calculate the target signal-to-interference ratio (SIR) data on a user-defined quality standard parameter (received via an input 75).

A combiner 76 (preferably a subtractor) compares (preferably subtracts) the measured signal-to-interference ratio (SIR) data of the device 72 and the calculated target signal-to-interference ratio (SIR) data of the processor 74, thereby A signal to interference ratio (SIR) error signal is output. The signal-to-interference ratio (SIR) error signal of the combiner 76 is input to the processing circuit 77 to generate an up-level command/down-level command.

The receiving communication station 70 also has a transmitter 78, wherein the transmitter 78 is coupled to the processing circuit 77. The transmitter 78 of the receiving communication station 70 also has an input 80 of user data. The receiving communication station 70 will pass through a connected antenna system 79 to transmit its user data and control related data.

The transmitting communication station 50 also has a receiver 56 and an associated receiving antenna system 57. The receiver 56 of the transmitting communication station 50 will receive the transmitting wireless signal of the receiving communication station 70, which includes the user data 84 of the receiving communication station 70 and the control data 85 generated by the receiving communication station 70.

The transmitter processor 55 of the transmission communication station 50 has an input 58 which is connected to the receiver 16 of the transmission communication station 50. The processor 55 receives the up command signal/down command signal via the input 58 to calculate these transmission power adjustments.

Please refer to the internal circuit of this closed-loop power control system. The transmitter 51 of the transmitting communication station 50 will set the power based on the high-rate up-level command and down-level command (generated by the remote receiving communication station 70). At this remote receiving communication station 70, this receiving data letter The signal-to-interference ratio (SIR) is measured by the measuring device 72, and the combiner 76 is used to compare with the target signal-to-interference ratio (SIR) generated by the processor 74. This signal-to-interference ratio (SIR) value, assuming that the data is received using this value, will theoretically get an ideal quality of service (QoS). If the measured received signal-to-interference ratio (SIR) is less than the target signal-to-interference ratio (SIR), the processing circuit 77, via the transmitter 78 of the receiving communication station 70 and the receiver 56 of the transmitting communication station 50, will Issue an up-level command to this transmitter 51. Conversely, the processing circuit 77, via the transmitter 78 of the receiving communication station 70 and the receiver 56 of the transmitting communication station 50, will issue a down-level command to the transmitter 51. Due to the high-rate feedback of this upper-level command and this lower-level command, it can instantly respond to the transmission channel and interference of this time change. This kind of power control system can be called a closed loop. If the transmission power level needs to be changed due to time-varying interference and transmission, this power adjustment system can quickly respond and adjust the transmission power accordingly.

According to the external loop of the closed loop power control system in FIG. 3, at the receiving communication station 70, the quality of the received data can be evaluated by the measuring device 73. Typical metrics for digital data quality are bit error rate (BER) and block error rate (BLER). The calculation of these metrics requires accumulated data for a certain time period, where this time period is significantly greater than the period of time change transmission and interference. For any given metric, there will be a theoretical relationship between this metric and the received signal-to-interference ratio (SIR). When the remote receiver has accumulated enough data to evaluate this metric, this metric will be calculated by the processor 74 and compared with the ideal metric (representing the ideal quality of service (QoS)) to output a The updated target signal-to-interference ratio (SIR). This updated target interference ratio (SIR) value, when applied to this In the case of a receiver algorithm, theoretically, this measurement metric will converge to an ideal value. Subsequently, the updated target signal-to-interference ratio (SIR) will be applied in the internal loop to determine the direction of the up-level command/down-level command, which can be transmitted to the power scale generation processor of the transmission communication station 50 55. In order to control the power of the transmitter 51.

Regarding external loop power control, whether the implementation is the open loop system shown in Figure 2 or the closed loop system shown in Figure 3, an initial target metric, such as the target signal-to-interference ratio (SIR), will be After setting, this initial target metric will be recalculated based on feedback from an external loop during wireless communication. As we know, the adjustment of this target metric is achieved by using a fixed class method, in which the upper class and the lower class system set incremental amounts to converge to an ideal goal.

This authoring department changes this conventional method to determine the starting target signal to interference ratio (SIR) of non-real-time (NRT) data. For example, a wireless transmission and reception unit (WTRU) of the 3rd Generation Partnership Project (3GPP) system will use the following conditional steps when the wireless connection is installed or transferred: (1) If the first temporary dedicated When the channel (Temp-DCH) setting period (or the transmission time interval (TTI) size S) is less than a certain critical value (for example, a predetermined convergence time target), a starting target signal-to-interference ratio (SIR) will be changed by An initial mapping is obtained from the look-up table, and offset by a value (for example, 2*log₁₀(1/BLER)). The determination of this offset value is based on decreasing the variance of channel conditions. For example, if the decreasing channel condition is highly flexible, the offset value will be adjusted upwards. The downlink external loop power control does not adjust the initial target signal-to-interference ratio (SIR) (ie: this temporary dedicated channel (Temp-DCH)) The target signal-to-interference ratio (SIR) will be fixed at the starting target signal-to-interference ratio (SIR)). This downstream internal loop power control (ILPC) will be executed normally to compensate for the rapidly decreasing and systematic measurement offset error. Generally speaking, this downlink internal loop power control (ILPC) does not include the adjustment of the target signal to interference ratio (SIR).

(2) If the period set for the first temporary dedicated channel (Temp-DCH) is greater than a certain critical value (for example, the predetermined convergence time target), a starting target signal-to-interference ratio (SIR) will start from one Obtained from the mapping look-up table, and this downlink power control system operates normally.

(3) When the target signal-to-interference ratio (SIR) that can provide the previous service changes (that is, the actual measured target signal-to-interference ratio (SIR) minus the initial target signal-to-interference ratio of the radio network controller (RNC) ( SIR)), a starting target signal-to-interference ratio (SIR) of the new service will be adjusted using the average change of the target signal-to-interference ratio (SIR) (instead of the above steps (1) and (2)). In this way, the high accuracy of the external loop power control of the previous service can be utilized.

After the initial target signal-to-interference ratio (SIR) is set, the downlink external loop power control program can apply a "jumping" algorithm, which is based on the cyclic redundancy results of this data to adjust a target signal-to-interference ratio ( SIR). Figure 4 shows an example of the use of a common hopping algorithm. In the target signal-to-interference ratio (SIR), when each transmission time interval (TTI) starts, each upward and downward hierarchy is a relatively fixed Level adjustment. It is best to perform a cyclic redundancy check (CRC) for each transmission time interval (TTI), and each cyclic redundancy check (CRC) that does not have an error will perform a downward adjustment. In contrast, Each cyclic redundancy check (CRC) with errors will be adjusted upwards.

In the preferred embodiment of this creation, the basic jump algorithm can be calculated using the following equation. If the k-th block of this cyclic redundancy check (CRC) does not detect an error, then target_SIR (k)=target_SIR (kl)-SD (dB) equation (1) otherwise, if a cyclic redundancy occurs Check the (CRC) error, then target_SIR (k)=target_SIR (k-1)+SU (dB) Equation (2) where, the downward level (SD) and the upward level (SU) are calculated using the following equation. SD=SS*target_BLER equation (3) SU=SS-SD equation (4) where SS adjusts the target signal-to-interference ratio (SIR) level, which will match the level of the preferred embodiment of this creation The changes are detailed below.

Downstream external loop power control usually has three states, namely: initial internal loop stable state, transient state, and steady state. Figure 5A shows the target signal-to-interference ratio (SIR) adjustment method according to this creation during different downlink external loop power control states. A method and system for adjusting the power of the downlink external loop to control the target signal-to-interference ratio (SIR) can be found in the international patent application number PCT/US 03/28412 (application date of September 10, 2003), which corresponds to the United States Patent application number 10/659673 (application date is September 10, 2003), and is owned by the same assignee of this creation.

As shown in Figure 5, the target signal-to-interference ratio (SIR) should be kept constant in the stable state of the entire internal loop. In the stable state of the internal loop, the internal loop transmit power command (TPC) algorithm does not need to change the initial target signal-to-interference ratio (SIR) to correct the initial system error and random measurement error.

In this transient state, the external loop power control algorithm will try to correct this channel The initial target signal-to-interference ratio (SIR) error caused by condition mismatch. First of all, in this transient state, the jump algorithm should be able to use a larger downward step, in order to quickly reduce the target signal to interference ratio (SIR), that is: forcing a cyclic redundancy check (CRC) error. In this steady state, the outer loop power control algorithm uses a relatively small downward step to try to maintain a target signal-to-interference ratio (SIR). In the preferred embodiment of this creation, the characteristic of this wireless transmission and receiving unit (WTRU) downlink open loop power control (OLPC) is to transition from the relatively large class of the transient state to the relatively small class of the steady state. In addition, another feature of the preferred embodiment of the present creation is to increase the level of this stable state when there is no cyclic redundancy check (CRC) error occurring within a predetermined period.

In this transient state, for this reference transmission channel (RTrCH), the initial class SS_T_SYes, for example, based on this target block error rate (BLER) and the N of each transmission time interval (TTI)_BA transmission block, calculated using the following equation: SS_T_B=2[log₁₀(1/BLER_target)]/N_B(dB) Equation (5) For example, when BLER_target=10^-²And N_B=2, SS_T_S= 2. Subsequently, according to the previously mentioned equation (3) and equation (4), the beginning of this transient state goes down to the level SD_TAnd start the upper level value SU_TDepartment can be calculated, that is: SD_T=0.02, and, SU_T=(2-0.02)=1.98。

The occurrence of cyclic redundancy check (CRC) errors can trigger the reduction of the class size until the class size of the transient state converges to the class size SS of the steady state_S_S. In this example, the class size SS of this steady state_S_SIt is best to use the following equation for calculation: SS_S_S=0.25[log₁₀(1/BLER_target)]/N_B(dB) Equation (6) Preferably, when a cyclic redundancy check (CRC) error occurs in a certain transmission time interval (TTI) of this transient state, the size of this level can preferably be reduced by 1/2. Subsequently, this reduced class size is applied to this jumping algorithm. This process will iterate until the new class size can converge to this stable class size. In the above example, convergence will occur after three iterations, because SS_T_S=2³*SS_S_S. Therefore, during this transient state, for each transmission time interval (TTI) with cyclic redundancy check (CRC) error, the next class size is best reduced by 1/2 from the initial class sizeⁿ, Where n is the number of transmission time intervals (TTI) starting from this transient state and including at least one cyclic redundancy check (CRC) error, until the new class size can converge to the class size of this stable state. When convergence occurs, this stable state can be reached, and the reduction in class size will not be further implemented.

Figure 5 shows the practical scheme of the above example. When the first cyclic redundancy check (CRC) error occurs at point A, the target signal-to-interference ratio (SIR) will increase by half the transient state to the upper level SU_T/2. This cyclic redundancy check (CRC) error will also cause the adjustment of the downward step size; subsequent transmission blocks without cyclic redundancy check (CRC) error will reduce the target signal to interference ratio (SIR) SD_T/2. When the next cyclic redundancy check (CRC) error occurs, the upper level will be adjusted to SU_T/4, the target signal-to-interference ratio (SIR) will increase by the same amount, and the downward step size will also be adjusted to SD_T/4. This algorithm will continue until the adjusted upper level SU_TCan be equal to the upper class size SU of the steady state_S, Which is equal to SU in the examples in Figures 5 and 6_T/8. At this point, the steady state can be achieved. In addition, these upper class sizes and lower class sizes will also be fixed in SU_SAnd SD_S。

When entering this transient state, when the cyclic redundancy check (CRC) error is continuously detected, The steady state convergence system is quite fast. Figure 6 is a diagram showing the above example. After entering this transient state, there are several transmission blocks with cyclic redundancy check (CRC) errors. Therefore, in this target signal-to-interference ratio (SIR), Upper class SU in transient state_TThe continuity of the department is reduced. As shown in Figure 6, the initial cyclic redundancy check (CRC) result represents the error at point A, which may increase the target signal-to-interference ratio (SIR) by SU_T/2, and set the size of the lower level to SD_T/2. Figure 6 can also show that after increasing the target signal-to-interference ratio (SIR), the first cyclic redundancy check (CRC) result indicates the possibility of an error. In the example shown at point B, the target signal-to-interference ratio (SIR) will increase again, but only the SU_T/4. Continuing this worst situation, a cyclic redundancy check (CRC) error occurs again in the third transmission time interval (TTI) of this transient state. The next upward adjustment of the target signal-to-interference ratio (SIR) will become SU_T/8. Because this upper class size is equal to the predetermined upper class size SU in this stable state_S, This transient state will end at this point, and a steady state will begin. This target signal-to-interference ratio (SIR), therefore, will increase SU_S=SU_T/8, and the down-level size will be set to SD_S=SD_T/8. Generally speaking, any cyclic redundancy check (CRC) error, whenever it occurs, will increase the target signal-to-interference ratio (SIR) by half of the previous increase.

After entering a stable state, the upper class size and the downward class size will be maintained at SU respectively._SAnd SD_S. Typically, when the communication metric changes slightly, the steady-state algorithm will generate a series of continuous upward and downward phase commands according to a regular pattern (not shown in the figure). However, when this communication is faced with rapid changes in operating conditions due to changes in interference or other factors, the steady-state algorithm will be less efficient. Therefore, this steady state will Changes over time, in order to meet the rapidly changing conditions.

During the steady state, when there is no cyclic redundancy check (CRC) error during the scheduled observation period, the size of this downward stage should preferably be automatically increased. For example, as shown in Figures 5 and 6, when there is no cyclic redundancy check (CRC) error in the eight transmission time intervals (TTI), the downward step size can be temporarily doubled, so as to make the eighth transmission time interval (TTI). One and the following successive downward class size becomes twice the SD_Squantity.

Preferably, the observation period can be relatively long, because the target signal-to-interference ratio (SIR) can be assumed to be converging fast. Preferably, this observation period can be set to 5/BLER continuous transmission block. This down-level value is 2SD_SIt will remain fixed until another cyclic redundancy check (CRC) error occurs. At this time, the descending level value will return to SD_S. When the channel conditions suddenly improve, this approach can improve the convergence time and cause an additional measured signal-to-interference ratio (SIR), compared to the ideal target signal-to-interference ratio (SIR). This stable state will last for the entire life of the CCTrCH communication, and such adjustments will be made during the incremental amount of time (equal to the observation period) when there is no cyclic redundancy check (CRC) error.

Or, when there is no cyclic redundancy check (CRC) error in a predetermined observation period, the program will return to this transient state to reduce the convergence time, and when the target signal-to-interference ratio (SIR) converges (using the above Method) Once again into a stable state. In this type of example, this down-level value will be determined by SD_SSwitch to SD_T_S(As previously defined), and then incrementally decrease to the steady state value if a cyclic redundancy check (CRC) error is detected.

For a reference transmission channel (RTrCH) of a coded composite transmission channel (CCTrCH), in an example where more than one transmission block is received in each transmission time interval (TTI) (that is: N_B>1), the target signal-to-interference ratio (SIR) is best adjusted by the following equation: target_SIR=current_target_SIR+(SU*N_E)-SD^*(N_B-N_E) Equation (7) where N_EIt is defined as the number of cyclic redundancy check (CRC) errors of this reference transmission channel (RTrCH) in each transmission time interval (TTI). However, the size of this class can preferably only be adjusted once in each transmission time interval (TTI), which is located at the beginning of each transmission time interval (TTI), and can only be adjusted when there is at least one cyclic redundancy check (CRC) error. Transmission time interval (TTI).

The aforementioned external loop algorithm can preferably be implemented in a processor that calculates the target signal-to-interference ratio (SIR), such as the processor 36 of the open-loop system shown in Figure 2 and the closed-loop system shown in Figure 3ofprocessor74. The implementation method of this algorithm is to determine whether there are any cyclic redundancy check (CRC) errors in the new transmission time interval (TTI), appropriately adjust the size of the upper and lower levels, and, based on the individual cyclic redundancy check ( CRC) as a result, these class adjustments are applied. For example, consider that there are four transmission blocks (ie: N_B=4) Transmission Time Interval (TTI), where three transmission blocks have a cyclic redundancy check (CRC) error. Before this transmission time interval (TTI), if the upper class size is SU_T/2, and the size of this downward class is SD_T/2, then this external loop algorithm first adjusts these levels to SU_T/4 and SD_T/4, and then update the target signal-to-interference ratio (SIR) appropriately. The net result is expressed as: adjusted target_SIR=current_target_SIR+3 (SU_T/8)-SD (SD_T/8)。

For a 3rd Generation Partnership Project (3GPP) system, in this transient state and this In a stable state, if this reference transmission channel (RTrCH) is reselected (for example, a service with a different bit rate), and the target block error rate (BLER) of the new reference transmission channel (RTrCH) is different from the old reference The target block error rate (BLER) of the transmission channel (RTrCH), the signal-to-interference ratio (SIR) step size will be recalculated according to the new target block error rate (BLER). In a steady state, this observation period must also be updated, and the current block count without errors must also be set to 0. In the transient state, in addition to recalculating the class size, additional adjustments can also compensate for the convergence that has occurred in this state. In other words, this initial up-level value SU or down-level value SD will not be applied. On the contrary, the adjustment for detecting cyclic redundancy check (CRC) errors will be applied. As mentioned earlier, part of the upper rank value and part of the lower rank value use a factor of 1/2ⁿPerform calculations, where n is the number of transmission time intervals (TTI) that include at least one cyclic redundancy check (CRC) error after this transient state. For example, if the previous down-level value of the reference transmission channel (RTrCH) is reselected as SD_T_o_l_d/4, then the lower level value after reselecting the reference transmission channel (RTrCH) must be set to SD_T_n_e_w/4, and the upper level value must be set to SU_T_n_e_w/4。

Figures 7A to 7C show the implementation flow chart of the downlink external loop power control algorithm of the 3rd Generation Partnership Project (3GPP) system. In Figure 7A, the first stage 300 is a preferred procedure for the stable state of the internal circuit. In step 302, the internal loop settling time, transient state level SS_T_S, Steady state class size SS_S_S, And the transmission time interval (TTI) parameters are initialized. The settling time of this internal loop is best set to 100ms. Transient state class size and steady state class size SS_T_SThe value of is initialized according to equation (6) and equation (7). The time value of this transmission time interval (TTI) count is set to zero.

In step 304, the product (TTI count multiplied by the TTI length) and the internal loop settling time are compared. If the product is greater than the settling time of the internal loop, the settling state is completed, and the power control algorithm will advance to this transient state. If the product is less than the internal loop settling time, the transmission time interval (TTI) count will be incremented by 1 in step 306, and the settling state will return to step 304 for another comparison. In this way, the first stage 300 of this algorithm can ensure that a sufficient transmission time interval (TTI) has passed, whereby the internal loop control control can correct the initial system error and random measurement error.

In Figure 7B, the second stage 307 represents a better procedure for downlink external loop power control during this transient state. Step 308 is to use the affirmative decision of step 304 of the part of the flow in FIG. 7A to initiate the initialization. In step 308, these transient state parameters are initialized. The size of this level is best set to SS according to equation (5)_T_S, The descending level of this transient state is the level of this level multiplied by the block error rate (BLER) value (ie: SD_T=BLER*SS_T_S), and, this transient state is up to the level of SU_TDepartment of class size SS_T_SAnd down class size SD_TThe difference between (ie: SU_T=SS_T_S-SD_T)。

In step 310, compare this class size SS_T_SAnd the class size SS of this stable state_S_S. This class size SS_T_SThe starting value of is based on equation (6), and is determined in step 302. In step 310, determine the class size SS_T_SIs it greater than the class size SS of this stable state_S_S. If not, the transient state is complete, and the algorithm will proceed to step 320 of the partial flow in Figure 7C. If yes, the method proceeds to step 312 to check the number of transmission time interval (TTI) cyclic redundancy check (CRC) errors N_EWhether to At least one. If not, the method proceeds to step 318, whereby the target signal interference ratio (SIR) is decremented according to the following equation: target_SIR=current_target_SIR-SD_T*N_BEquation (8) In step 318, the target signal-to-interference ratio (SIR) is set to at least one minimum value MTN_DL_SIR. In other words, if the target signal-to-interference ratio (SIR) is less than the predetermined value MIN_DL_SIR, the target signal-to-interference ratio (SIR) will be equal to the minimum value. After step 318 is completed, this procedure returns the newly reduced target signal-to-interference ratio (SIR) to step 310.

Return to step 312, if at least one cyclic redundancy check (CRC) error is detected in the current transmission time interval (TTI), go to the upper level SU_TAnd down class size SD_TIt will be adjusted in step 314. This transient state class size SS_T_SWill be set to half the tier size SS_T_S. These upper class size SU_TAnd down class size SD_TThe value of will be based on equations (3) and (4), using the new class size SS of the transient state_T_Sreadjust.

In step 316, the target signal-to-interference ratio (SIR) is increased according to the following equation: target_SIR=current_target_SIR+(SU_T*N_E)-SD_T (N_B-N_E) Equation (9) This new target signal-to-interference ratio (SIR) value must be checked not to be greater than the predetermined maximum value MAX_DL_SIR. If the new target signal-to-interference ratio (SIR) is greater than the maximum value, the new target signal-to-interference ratio (SIR) will be set to the maximum value MAX_DL_SIR. This transient state will continue to return to step 310 and repeat the cycle until the magnitude of the transient state is greater than the level of the steady state.

In Figure 7C, the third stage 319 represents a better procedure for the steady state part of the downlink outer loop power control. In step 320, the parameters of the steady state include: the signal to interference ratio (SIR) level and the steady state upper level value SU_SDepartment to make adjustments. The signal to interference ratio (SIR) level is set to the steady state level SS determined in step 302_S_S. This upper class value SU_SBased on equation (3), using the steady-state level size SS_S_SCalculation. In step 322, an observation period is checked whether it is greater than or equal to 5/BLER. First of all, this observation period is less than 5/BLER. In this case, step 324 starts, where the descending level value SD_SIs equal to the product BLER*SS_S_S。

In step 328, it is checked whether this transmission time interval (TTI) has detected at least one cyclic redundancy check (CRC) error. If yes, step 330 starts, where the target signal-to-interference ratio (SIR) is increased according to the following equation: target_SIR=current target_SIR+(SU_S*N_E)-SD_S (N_B-N_E) In equation (10), due to the detection of a cyclic redundancy check (CRC) error, the observation period is reset to zero. If the new target signal-to-interference ratio (SIR) is greater than the value MAX_DL_SIR, the new target signal-to-interference ratio (SIR) will be set to the value MAX_DL_SIR. Otherwise, the target signal-to-interference ratio (SIR) will remain at the value calculated by equation (10). The procedure will return to step 322 to check the observation period. When this observation period is greater than or equal to 5/BLER, step 326 will start, in which the descending level value SD_SWill double. The procedure then proceeds to step 328 to check for cyclic redundancy check (CRC) errors. If no cyclic redundancy check (CRC) error is detected, step 332 will start, where the target signal-to-interference ratio (SIR) will be based on the following The equation is increased.

Target_SIR=current_target_SIR-(SD_S*N_B) Equation (11) If the new target signal-to-interference ratio (SIR) value is less than the minimum value MIN_DL_STR, the new target signal-to-interference ratio (SIR) will be set to the minimum value MIN_DL_SIR. Otherwise, the target signal-to-interference ratio (SIR) will remain at the value calculated by equation (11). After step 332, the algorithm stage 319 will return to step 322, and the algorithm 319 will be repeated until the CCTrCH is no longer active.

Especially in the non-real-time (NRT) data transmission of the temporary dedicated channel (Temp-DCH) setting, the following description summarizes the temporary dedicated channel (Temp-DCH) setting. After the first transmission time interval (TTI), the more Best program. The initial target signal-to-interference ratio (SIR) is calculated from the last target signal-to-interference ratio (SIR) set in the previous temporary dedicated channel (Temp-DCH). The upper limit of the starting target signal-to-interference ratio (SIR) value is the starting target signal-to-interference ratio (SIR) (obtained from the starting mapping table) plus an upper limit boundary, and the starting target signal-to-interference ratio ( The upper limit of the SIR value is the initial target signal-to-interference ratio (SIR) (obtained from the initial mapping look-up table) minus a lower limit boundary. The initial target signal-to-interference ratio (SIR) can also be adjusted based on the data rate and block error rate (BLER) required for the new temporary dedicated channel (Temp-DCH) setting. When the mutual arrival time required by the temporary dedicated channel (Temp-DCH) setting is too long (for example, 10s), the initial target signal-to-interference ratio (SIR) of a radio network controller (RNC) and the previous temporary dedicated channel (Temp-DCH) The linear combination of limiting target signal-to-interference ratio (SIR) set by (Temp-DCH) can also be used with appropriate weights (that is, to compensate for the factors of mutual arrival time). When this starts the target signal-to-interference ratio (SIR) When the final decision is made, it includes various adjustments for a given temporary dedicated channel (Temp-DCH) setting, this target signal-to-interference ratio (SIR) value, and during the external loop power control operation of this temporary dedicated channel (Temp-DCH) setting, Will not exceed or fall below this initial target signal-to-interference ratio (SIR) value, reaching a given boundary.

Figure 8 is a flowchart showing the implementation of an algorithm 500, where this algorithm 500 uses historical data of the target signal-to-interference ratio (SIR) to improve the downlink external loop power control, which is particularly suitable for temporary dedicated channels (Temp- DCH) non-real time (NRT) data settings. This program system can select the initial transient state level of a jump algorithm, and is not based on the period set by the temporary dedicated channel (Temp-DCH). The algorithm stage 501 provides a better program to generate the adjustment start target signal-to-interference ratio (SIR) of each temporary dedicated channel (Temp-DCH) setting.

In step 502, at the beginning of a wireless transmission and reception unit (WTRU) establishing a wireless connection or transferring, a conventional method is used to select a starting target signal-to-interference ratio (SIR). In step 503, the temporary dedicated channel (Temp-DCH) will be checked whether it is the first setup (that is, whether it is the beginning of a wireless transmission and reception unit (WTRU) establishing a wireless connection or transferring). If so, step 504 will start the parameter α to zero. If not, the algorithm 500 will proceed directly to step 505, where the newly-started target signal-to-interference ratio (SIR) of this temporary dedicated channel (Temp-DCH) will be calculated using the following equation to compensate for the various settings Mutual arrival time. target_SIR (j)=α*target_SIR (j-1)+(1-α)*(initial_target_SIR) equation (12) Among them, j indicates the current temporary dedicated channel (Temp-DCH) setting, target_SIR (j-1) indicates the last target signal-to-interference ratio (SIR) set in the previous temporary dedicated channel (Temp-DCH), and the initial_target_SIR system Represents the initial target signal-to-interference ratio (SIR) obtained from this mapping look-up table. This parameter α is a forgotten parameter to compensate for the mutual arrival time between the beginning of the current temporary dedicated channel (Temp-DCH) setting and the end of the previous temporary dedicated channel (Temp-DCH) setting (for example, α=exp (-T/ 10), where T is the mutual arrival time).

In step 506, the upper and lower limit test for calculating the target signal-to-interference ratio (SIR) is based on the maximum and minimum values MIN_DL_SIR and MAX_DL_SIR. If the value target_SIR is greater than the predetermined maximum value MAX_DL_IR, then this value target_SIR will be set to the maximum value (not the calculated value). On the other hand, if the value target_SIR is less than the predetermined minimum value MIX_DL_SIR, the value target_SIR will be set to the minimum value (not the calculated value). In step 507, the target signal-to-interference ratio (SIR) is adjusted based on the data rate.

Next, in step 508, the initial transient state level is determined based on the period set by the temporary dedicated channel (temp-DCH). The radio network controller (RNC) will transmit the temporary dedicated channel (temp-DCH) setting period in the header of the non-real time (NRT) data burst, which is best represented by the number of transmission time intervals (TTI). The wireless transmission and reception unit (WTRU) receives and decodes the temporary dedicated channel (temp-DCH) setting period. Step 508 corresponds to step 308 in FIG. 7B, but has been modified for temp-DCH processing. The following class size selection is explained by using the preferred range of the temporary dedicated channel (temp-DCH). If the period of the temporary dedicated channel (temp-DCH) is less than 100 TTI (90~95% of the cumulative density function), the initial transient level will be equal to the steady state level (ie: SIR_step_size_TS=SIR_step_size_SS) .

If the period of the temporary dedicated channel (temp-DCH) is set between 100 and 200 TTI, the initial transient level will be equal to the double level of the steady state (ie: SIR_step_size_TS=2SIR_step_size_SS), and, The external loop power control will also move from a transient state to a stable state after a cyclic redundancy check (CRC) error occurs.

If the period of the temporary dedicated channel (temp-DCH) is set between 200 and 400 TTI, the initial transient level will be equal to four times the steady state level (ie: SIR_step_size_TS=4SIR_step_size_SS), and, The external loop power control will also move from a transient state to a stable state after two cyclic redundancy check (CRC) errors occur.

Finally, if the period of the temporary dedicated channel (temp-DCH) is greater than 400 TTI, the initial transient level will be equal to eight times the steady state level (ie: SIR_step_size_TS=4SIR_step_size_SS), and the external loop power The control will also move from a transient state to a stable state after three cyclic redundancy check (CRC) errors occur.

After step 508, the external loop power control of the current temporary dedicated channel (temp-DCH) will start. In addition, step 509 is based on the enhanced external loop power control shown in Figures 7B to 7C.

For each new temporary dedicated channel (temp-DCH) setting, the algorithm 500 is repeated.

It should be noted that although this creation description uses non-real-time (NRT) data as an example, this creation can also be applied to real-time (RT) data with a relatively short period. In addition, it should be noted that, including the temporary dedicated channel (temp-DCH) period, the target signal to interference ratio (SIR) side The parameters such as the boundary and the mutual arrival time required by the temporary dedicated channel (temp-DCH) can also be changed to obtain more ideal performance.

Preferably, the components implementing the algorithms in Figures 5 to 8 can be implemented in a single integrated circuit, such as a special application integrated circuit (ASIC). However, part of the algorithm can also be implemented on multiple independent integrated circuits.

Although this creation note discusses external loop power control under the framework of the Third Generation Partnership Project (3GPP), it is not intended to limit the scope of this creation. This creation can also be applied to other wireless communication systems, including GSM, 2G, 2.5G or any other type of wireless communication system, and implement equal external loop power control in it. In addition, if you are familiar with this technique, you can make various adjustments and changes to this creation without violating the spirit and scope of this creation.

<p>UE. . . User equipment</p><p>CN. . . Core network</p><p>RNC. . . Wireless network controller</p><p>UTRAN. . . Universal mobile telecommunication system surface wireless access network</p><p>10. . . Open loop power control transmitter</p><p>15. . . Calculate the transmission power</p><p>16. . . No receiver specified</p><p>18. . . Measure reference signal power</p><p>19. . . Calculate path loss</p><p>32. . . Measuring interference power</p><p>34. . . Measurement data quality</p><p>36. . . Calculate the target signal-to-interference ratio</p><p>38. . . No transmitter specified</p><p>50. . . Closed loop power control transmitter</p><p>55. . . Calculate the transmission power</p><p>56. . . No receiver specified</p><p>72. . . Measure the signal-to-interference ratio</p><p>73. . . Measurement data quality</p><p>75. . . Calculate the target signal-to-interference ratio</p><p>77. . . Determine the up and down level value</p><p>78. . . No transmitter specified</p>

Figure 1 is a schematic diagram showing the system architecture of a conventional Universal Mobile Telecommunications System (UMTS) network.

Figure 2 is a schematic diagram showing a conventional open loop power control system used in a wireless communication system, which implements external loop power control through a target signal-to-interference ratio (SIR) measurement.

Figure 3 is a schematic diagram showing a conventional closed loop power control system for a wireless communication system, which implements internal loop power control through a target signal-to-interference ratio (SIR) measurement.

Figure 4 is a schematic diagram showing the adjustment of the target signal-to-interference ratio (SIR), which is based on a hopping algorithm that can be applied to the downlink open loop power control (OLPC).

Figure 5 is a schematic diagram showing the target signal-to-interference ratio (SIR) adjustment of the wireless transmission and receiving unit (WTRU) downlink open loop power control (OLPC) according to this creative example.

Figure 6 is a schematic diagram showing the target signal-to-interference ratio (SIR) adjustment of the wireless transmission and reception unit (WTRU) downlink open loop power control (OLPC) according to this creative example, where the wireless transmission and reception unit (WTRU) is open for downlink Loop Power Control (OLPC) has a compressed transient state.

Figures 7A to 7C show the flow chart of the downlink open loop power control (OLPC) algorithm according to this creative example.

Figure 8 is a flowchart showing the method of enhancing the open loop power control (OLPC) algorithm based on the non-real-time data created by this invention.