Power control and handover using power control commands and delete indicators

FIELD: radio engineering, communication.

SUBSTANCE: in one aspect, power control (PC) is supported in several PC modes such as "up-down" PC mode and delete-based PC mode. One PC mode may be selected for use. Overhead may be sent to indicate the selected PC mode. If the "up-down" PC mode is selected, a base station assesses the quality of the received signal for the terminal and sends PC commands to instruct the terminal to adjust its transmission power. If the delete-based PC mode is selected, the base station sends delete indicators which indicate whether code words received from the terminal are deleted or not. In both PC modes, the terminal controls its transmission power based on a power control feedback (e.g. PC commands and/or delete indicators) in order to attain the desired level of efficiency (e.g. desired delete frequency for code words). Delete indicators may also be used for handover.

EFFECT: reduced noise and achieving high efficiency for all terminals.

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The technical field to which the invention relates

The present invention relates in General to communications, and more specifically to techniques for performing power control and transmission service in wireless communication system.

The level of technology

Wireless communication system with multiple access can support communication for multiple wireless terminals by sharing the available system resources, for example bandwidth and transmit power. Each terminal may communicate with one or more base stations via the transmission for forward and reverse link. Direct link (or downward communication refers to the communication line from the base stations to the terminals, and the reverse link (or upward communication refers to the communication line from terminals to base stations.

Several terminals can simultaneously receive data in a straight line and/or to transmit data on the reverse link. This can be performed by multiplexing transmission on each line so that they are orthogonal to each other in the time, frequency and/or code domain. In the return line full orthogonality, if achieved, results in the transmission from each terminal without interference to the transmissions from other terminal is in the receiving base station. However, full orthogonality for transmissions from different terminals are often not realized due to the characteristics of the channel, the shortcomings of the receiving device, etc. Loss of orthogonality leads to a certain amount of interference from each terminal to the other terminals communicating with the same base station. Moreover, the transmission from the terminals that communicate with different base stations in a typical embodiment, are not orthogonal with respect to each other. Thus, each terminal may also cause interference to other terminals communicating with neighboring base stations. The effectiveness of each terminal is reduced due to interference from all other terminals in the system.

Therefore, in the art there is a need for techniques to control the transmit power of the terminal to reduce interference and to achieve good efficiency for all terminals.

The invention

This document describes the methodology for the effective implementation of power control and transmission service. In one aspect, power control (PC) supported on multiple PC modes such as PC-mode "up-down PC mode on the basis of the Erasure. One PC mode can be selected for use, for example, on the basis of demand is th efficiency. Service signals (for example, bit PC mode) can be sent to indicate the selected PC mode. If the selected PC mode "up-down", the base station evaluates the quality of the received signal for the terminal and the PC sends commands to instruct the terminal to adjust its transmit power. If you select PC mode on the basis of erasing, the base station detects the code word received from the terminal, and sends indicators erase, which indicate whether these code words erased or sestertii. For both PC modes, the terminal adjusts its transmit power based on feedback power control (for example, PC commands and/or indicators erase)to achieve the target level of performance (for example, the target frequency erase the code word sent via the terminal).

In another aspect, the power regulation is based on PC commands, and transfer is performed on the basis of indicators erase. The terminal transmits the code word on the reverse link. The first set of at least one base station evaluates the quality of the received signal for the terminal, for example, based on the code words received from the terminal, and generates a PC-command based on the signal quality. A second set of at least one base station and generates indicators erase for code words, received from the terminal. The first set may include only the serving base station. The second set may include the serving base station and possibly other base stations. The terminal adjusts its transmit power based on PC commands received from the first set of base station(s). The terminal can determine the frequency of erasing for each base station in the second set, select the base station with the lowest frequency erase and transfer service to the selected base station.

Hereinafter described in more detail various aspects and features of the invention.

Brief description of drawings

Figure 1 illustrates a wireless communications system.

Figure 2 illustrates the mechanism of power control that supports multiple PC modes.

Figure 3 illustrates the mechanism of power control for PC-mode "up-down".

Figure 4 illustrates the mechanism of power control for PC-based mode erase.

Figure 5 illustrates the process performed by a base station for power control of the terminal.

6 illustrates the device in a base station for power control of the terminal.

7 illustrates a process performed by a terminal for power control.

Fig illustrates the device in the terminal for regulating powerfully the tee.

Fig.9 illustrates a process for performing power control and transmission service.

Figure 10 illustrates a device for performing power control and transmission service.

11 illustrates a block diagram of the terminal and two base stations.

Detailed description of the invention

Figure 1 illustrates a wireless communication system 100 with multiple base stations 110. The base station is a station that communicates with the terminals. The base station may also be called or may contain part or all of the functionality of the access point, node B, and/or any other network entity. Each base station provides coverage due to specific geographical areas. The term "cell" can refer to a base station and/or its coverage area depending on the context in which the term is used. To improve system capacity, the coverage area of a base station may be partitioned into multiple (for example, three) smaller areas. Each smaller area may be served by the respective base transceiver transmitting subsystem (BTS). The term "sector" can refer to a BTS and/or its coverage area depending on the context in which the term is used. For broken down by sectors of the cell BTS for all sectors of this cell in a typical embodiment, jointly located is received within the base station's cell.

Terminals can be distributed across the system, and each terminal may be stationary or mobile. For simplicity, only one terminal 120 shown in figure 1. The terminal also can be named and may contain part or all of the functionality of an access terminal (AT), a mobile station (MS), user equipment (UE) and/or any other object. The terminal may be a wireless device, cellular telephone, personal digital appliance (PDA), wireless modem, handheld device, etc. Terminal may communicate with zero, one, or multiple base stations on a straight line and/or return line connection at any given moment.

In a centralized architecture, a system controller 130 is connected to the base stations 110 and provides coordination and control base stations. System controller 130 may be a single network object or a set of network objects. In a distributed architecture, the base stations can communicate with each other as necessary.

Methods power control and transmission of the services described in this document can be used for various wireless communication systems and various radio technologies, such as multiple access, code division multiple access (CDMA), multiple access with time division multiplexing (TDMA), the plural is the only access to the channel frequency division (FDMA), orthogonal FDMA (OFDMA), single carrier FDMA on (SC-FDMA), etc. uses OFDMA multiplexing orthogonal frequency division multiplexing (OFDM), and SC-FDMA uses multiplexing frequency division channels on a single carrier (SC-FDM). OFDM and SC-FDM partition the frequency range (for example, the system bandwidth into several orthogonal subcarriers, which are also called tones, elementary signals, etc. Each subcarriers may be modulated with data. In General, the modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDM. Methods can also be used for wireless communication systems that use multiple radio technologies (for example, CDMA and OFDMA).

The techniques described herein can also be used for systems with sectorsource honeycombs, as well as systems with sectorsource honeycombs. For simplicity, the techniques are described below for a system with sectorsource honeycombs. In the following description, the terms "base station" and "sector" are used interchangeably, and the terms "terminal" and "user" are also used interchangeably.

The terminal 120 can transmit the data service signals and/or other content on the reverse link. Passing through a return line connection can be supported in various ways, depending on the system design. In one project the active set is maintained for the terminal and includes one or more sectors that can serve the terminal on the reverse link. The sectors can be added or deleted from the active set based on the requirements to the quality of the signal that can be performed by the terminal and/or sectors. One sector in the active set can be designed as service sector return line connection (RL) for the terminal. The service sector can perform various functions (for example, dispatching, data decoding, power control, etc. to support the transmission return line connection for the terminal. The remaining sectors (if any) in the active set may be referred to as neobsluzhvane sectors in the active set. Neobsluzhvane sectors can perform various functions (for example, reporting on feedback)to assist in the selection of the service sector.

As shown in figure 1, the transmission from terminal 120 may be received by any number of sectors. These sectors may include the service sector 110x, neobsluzhvane sectors 110a-110m and other sectors (for example, the neighboring sector 110n)that are not in the active set of the terminal. Transmission from terminal 120 may cause interference to other terminals transmitting in that the e service sector 110x, and the other terminals transmitting in other sectors, for example the sectors 110a-110n. Therefore, it is desirable to adjust the transmit power of the terminal 120 so that the required efficiency is achieved for terminal 120 while reducing interference to other terminals.

1. The power regulation RL

Regulation of the power return line connection (RL) refers to the regulation of the transmission power of the terminal on the reverse link. In General, the control of power transfer RL can be performed on the basis of any RL transmission, which allows the sectors to assess the quality of the signal return line connection for the terminal. RL-transfer may be for control signals, data service signals, or combinations thereof. In order to achieve good efficiency of the power regulation, RL-transfer should be sent regularly to ensure that the transmit power could be regulated with a fairly fast speed, to track changes in the characteristics of the channel.

In one project the power regulation RL is based on the code words sent over the control channel by the terminal. In General, the code word can be for different types of information. In one project code words are used to report on indicators of channel quality (CQI)sent over a CQI channel. The terminal may measure the quality with the persecuted for the sectors in the active set, to generate a report CQI for these measurements and to transmit the CQI reports on a CQI channel, for example, in the service sector. The CQI reports can be used to select the appropriate sector to service by a terminal in a straight line. In other projects the code word can be for other types of information.

The CQI report (or message) may be a small word, containing L bits, where, in General, L≥1. This word can be mapped to one of the 2Lpossible code word in the coding table. The code word is then sent on the CQI channel. The same number of bits (for example, L bits) can be sent for each CQI report. In this case, the same coding table can be used for each CQI report. Alternatively, a different number of bits can be sent for different CQI reports, and various code tables can be used depending on the number of bits sent. Code words in this code book can be based on a block code or any other schema mappings. In one project 2Lpossible code words is generated for 2Ldifferent Walsh codes of length 2L. Specific Walsh code may be sent as a code word for L-bit CQI report.

In the aspect of regulation capacity is barb RL is supported for multiple PC modes. PC-modes can also be referred to as PC-scheme, PC-tools, PC-algorithms, etc. In the same project multiple PC modes include PC-mode "up-down PC mode on the basis of the Erasure. In PC mode the "up-down" sector (for example, service sector) evaluates the quality of the received signal for the terminal and the PC sends commands/bits to instruct the terminal to adjust its transmit power. In PC mode on the basis of the erase sector (for example, service sector) sends indicators/bits erase, which indicate the results of the detection-erase sector for code words received from the terminal. For both PC modes, the terminal adjusts its transmit power based on feedback power control (for example, PC commands and/or indicators erase)to achieve the target level of performance that can be quantified by a target frequency of washing and/or any other parameters.

Figure 2 illustrates the project mechanism 200 power control that supports the PC-mode "up-down PC mode on the basis of the Erasure. In this project, the service sector 110x sends to the terminal 120 service information, which indicates PC mode, which should be used to regulate power RL. In one project this service information is a bit RLCtrlPCMode to the th can be set to either 0 to specify a PC-based mode erase or 1 to indicate PC-mode "up-down". Service information can be sent at the beginning of the session each time there is a change in PC mode, etc. In another project sector 110x transmits in broadcast mode in PC mode, supported by sector, all terminals in its coverage area. In any case, the processor 258 service signals in the terminal 120 receives the service information from the service sector 110x and provides control mode, which indicates whether to use the PC mode "up-down" or PC-based mode erase.

If the selected PC mode "up-down", the service sector 110x periodically evaluates the quality of the received signal for terminal 120 and the PC sends commands through a straight line (cloud 252) to the terminal 120. Each PC command can be either (1) team UP to instruct the increase in transmit power, or (2) the team DOWN to instruct a decrease in transmit power. At terminal 120, the processor 260 PC-mode up-down PC takes commands from the service sector 110x, adjusts the transmit power of the terminal 120 based on the received PC commands and provides the power level Pud(n) in the processor/modulator 280 data transmission (TX). The processor 280 transmits the code word for transmission power in Psub> ud(n) return line connection (cloud 250) in the service sector 110x and neobsluzhvane sectors 110a-110m.

Sectors 110x and 110a-110m take the code word from the terminal 120. Each sector 110 decodes each received code word and discovers erase, to determine whether the result of decoding the desired level of confidence. The received code word can be (1) "erased"if the result of decoding does not meet the required level of trust, or (2) "nistertal", if the result of decoding satisfies the required level of trust. Each sector 110 sends indicators erase the terminal 120. Indicator erase can specify whether the received code word erased or nistertal.

If you select PC mode on the basis of the erase indicators erase from the service sector 110x is used to regulate the power RL. At terminal 120, the processor 270 PC-based mode erase accepts indicators erase from the service sector 110x, adjusts the transmit power of the terminal 120 based on the received indicators erase and provides the power level Peb(n) in the processor 280 TX-data. The processor 280 then transmits a code word for power transmission in Peb(n).

In the project shown in figure 2, the power regulation RL is exclusively the part based on feedback power control from the service sector 110x. This feedback may contain PC commands in PC mode up-down and indicators erase in PC mode on the basis of the Erasure. This project can simplify the control of power RL, because the transmit power of the terminal 120 is adjusted based on feedback from the same source.

The power regulation RL can also be performed on the basis of feedback from multiple sectors. In another project PC-mode "up-down" several sectors can evaluate the quality of the received signal for terminal 120 and to send PC commands in the terminal. The terminal 120 can then adjust its transmit power based on PC commands received from all sectors. Terminal 120 may adopt a rule OR down and may reduce its transmit power whenever any sector sends a command DOWN. The terminal 120 can also combine the received PC commands in other ways. In another project PC-based mode erase terminal 120 may adjust its transmit power based on the indicators erase taken from multiple sectors. In another one of a different design can be supported hybrid PC mode, and the terminal 120 may adjust its transmit power based on the combination of PC commands and indicators erase. The power regulation RL can also be implemented in other ways.

In one project Akti is hydrated set includes serving and neobsluzhvane sectors, as explained above. In another project the active set may include multiple synchronous subsets. The service sector may be selected from one of the synchronous subsets, and each of the remaining synchronous subset (if present) can be identified, for example, based on the frequency of the erase sector. The terminal can respond to feedback (for example, PC-command and/or indicators erase) from the service sector, as well as on feedback from the optimal sector in each of the remaining synchronous subset. To avoid possible uncertainty, each sector can use PC mode "up-down" for terminals served by this sector in the return line, and can use PC-based mode erase to other terminals, with the sector in their active sets.

In another aspect of the RL transmission to the terminal based on indicators erase sent via the operating and poslujivshego sectors. Relay transmission or transfer refers to the transfer of services from one service sector to another service sector. In the return line of the various sectors in a typical observe different signal quality for the terminal due to various losses in the path and/or the level of the her noise. It is desirable that the branch, watching the best quality of the received signal, served terminal. In General, the sectors can evaluate the quality of the received signal for the terminal based on any transmission sent by the terminal. However, if the terminal has already transmits a code word for other purposes, the sectors can effectively use these code words in order to assess the quality of the received signal for the terminal. Indicators erase sent by sectors, should then provide feedback indicating the quality of the received signal measured by sector for the terminal. The terminal may use the indicators erase in order to choose the best sector to serve the terminal on the reverse link.

In the project shown in figure 2, the processor 290 transmission service RL takes indicators erase from the service sector 110x and poslujivshego sector 110a-110m. The processor 290 identifies the sector, observing the best signal quality for the terminal 120 based on the received indicators erase, as described below. The processor 290 may generate a request for transmission service, if another sector watches more optimal signal quality for the terminal 120 than the current service is the overall sector.

In one project the power regulation RL can be performed based on PC commands, and transfer of RL can be performed on the basis of indicators erase. In another project power control and transfer of RL can be executed on the basis of indicators erase. In other projects the power regulation and transfer of RL can be performed based on other feedback from the sector.

PC-mode "up-down PC mode on the basis of the erasing can be implemented in various ways. Sample projects for two PC modes are described below.

Figure 3 illustrates the design of the mechanism 300 power control for PC-mode "up-down". The mechanism 300 power control includes an internal circuit 310, an external circuit 312 and the third circuit 314. The internal circuit 310 operates between service sector 110x and the terminal 120. External circuit 312 and the third circuit 314 are supported by service sector 110x. At terminal 120, the internal circuit 310 is supported by the processor 260 PC-mode "up-down", which includes a processor 262 PC commands and module 264 regulation TX-power.

The internal circuit 310 adjusts the transmit power of the terminal 120, to maintain quality of the received signal close to the target signal quality in the tertiary sector 110x. The signal quality can be kolichestvennaia by signal-to-noise ratio (SNR), signal-to-noise-and-interference noise (SINR), the power ratio carrier to interference (C/I), the relationship of energy per symbol to noise ratio (Es/No), etc. For simplicity, SNR is used to indicate the quality of the signal in the following description. In the tertiary sector 110x module 220 estimates the SNR estimates the received SNR of the terminal 120 (for example, on the basis of a control channel carrying code words) and provides the received SNR. Module 220 estimates the SNR can average SNR estimation over multiple frames to obtain an improved estimate of the received SNR. Module 220 estimates the SNR can also drop the SNR estimation for frames in which the received code word is erased. Module 222 of the formation of PC-command accepts the received SNR and the target SNR, compares the received SNR with the target SNR and generates a PC-command as follows:

if SNRrx(n)<SNRtargetthen PC-command = UP-command, otherwise equation (1),

if SNRrx(n)≥SNRtargetthen PC-command = DOWN command,

where SNRrx(n) is the received SNR in the framenand SNRtargetis the target SNR. Service sector 110x PC transmits commands to the terminal 120.

At terminal 120, the processor 262 PC commands takes the PC command sent by the service sector 110x, and makes a decision on each received PC command. Solution for PC can be either the solution UP if the received PC command is assumed to be a team UP, or the solution DOWN, if the received PC command is assumed to be the team DOWN. Module 264 regulation can then adjust the transmit power of the terminal 120 based solutions PC from the processor 262 as follows:

Pud(n+1)={Pud(n)+ΔPfor UP solutionsPud(n)-ΔPfor DOWN solutionEquation (2)

where Pud(n)is the transmission power framenand

ΔP is the step size of power control transfer in PC mode "up-down".

The transmit power level Pud(n) and the step size ΔP are specified in units of decibels (dB). In the project shown in equation (2), the transmit power increases or decreases by the same step size (for example, 0.5 dB, 1.0 dB, or any other value), which can be selected to provide good performance for power control RL. In another project, the transmit power is controlled through other step sizes centuries the px and down. The transmit power level Pud(n)also can be maintained at the same level, if the received PC command is assumed to be too unreliable. The processor 280 generates the codeword and transmits the code word for transmission power Pud(n)in the service sector 110x and neobsluzhvane sectors 110a-110m (not shown in Fig.3).

External circuit 312 adjusts the target SNR on the basis of the received code words to reach the target frequency of the erase code words sent by terminal 120. In the tertiary sector 110x module 224 calculate metrics computes a metric for each received code word. Detector 226 erase discovers erase for each received code word based on the metric and threshold erase, as described below, and provides the status of each received word that can be erased or nistertal. Module 228 adjusting the target SNR gets the status of each received code word in one project may adjust the target SNR as follows:

SNRtarget(k+1)={SNRtarg et(k)+ΔSNRup,for the erased code word,SNRtarget(k)-ΔSNRup,for Nesterova code word,Ur.(3)

where SNRtarget(k)is the target SNR in the update intervalk, ΔSNRupis the size of the step up to the target SNR, and ΔSNRdnis the step size down to the target SNR.

The target SNR and the size of the step up and down are defined in units of dB.

The size of the steps ΔSNRupand ΔSNRdncan be specified as follows:

ΔSNRup=ΔSNRdn(1-PrerasurePrerasure),Equation (4)

where Prerasureis the target frequency erase. As an example, if the target frequency erasing equal to 10%, then the step size up is 9 times the size of the step down. If the step size up equal to 0.5 dB, the step size down approximately 0,056 dB.

In another project serving base station 110x measures the frequency of the erase window erased code words and adjusts the target SNR on the basis of a difference between the measured frequency and the Erasure target frequency erase. The target SNR can be adjusted using the same or different size step up and down.

In one project the erase threshold is fixed, and the proper threshold value can be determined based on computer simulation, empirical measurements, and/or other funds. In another project the erase threshold is adjusted using a closed loop to achieve a target conditional error rate Prerrorfor code words. Conditional error rate is the probability of error, fit for mastertech code word that means: provided that the received codeword is declared nistertal, the probability of erroneous decoded the received code word is Prerror. The low value of Prerror(for example, 1% or 0.1%) corresponds to a high degree of reliability of the result of decoding, to the GDS announced Astarte code word.

The third circuit 314 adjusts the erase threshold based on the received known codewords to achieve a target conditional error rate. The terminal 120 can transmit a known codeword periodically or when instructed. In the tertiary sector 110x module 224 of the computing performance and detector 226 erase perform detection of erasing for each received known codeword, as with other received code words. Detector 226 erase provides the status of each received known codeword. The decoder 230 decodes each received known codeword, which is assumed to be nistertal, and provides the status of the code words, which may be: (1) "erased", (2) "good", if the received known codeword is nistertal code word and the decoded correctly, or (3) "bad", if the received known codeword is nistertal code word, but the decoded with an error. In one project module 232 regulation threshold erase adjusts the erase threshold based on the status of each received known codeword as follows:

THerasure(j+1)={ THerasure(j)-ΔTHdn,for "good" code word, THerasure(j)+ΔTHup,for the "bad" code word,THerasure(j),for "erased" code word,Ur.(5)

where THerasure(j)is the threshold erase the update interval j, ΔTHupis the size of the step up threshold erase, and ΔTHdnis the size of the step down threshold Erasure.

The project in equation (5) suggests that the higher the received code word corresponds to a greater degree of confidence. In this case, the erase threshold is increased by ΔTHupfor each received known codeword, which is "bad". A higher threshold Erasure corresponds to a more accurate criterion of detection erase and leads the way making the code word is more likely is erased, which, in turn, leads to the fact that the received code word is more likely to be correctly decoded when it is considered nistertal. The erase threshold is reduced by ΔTHdnfor each received known codeword, which is "good", and saves the received known codewords that are erased.

The size of the steps ΔTHupand ΔTHdncan be specified as follows:

ΔTHup=ΔTHdn(1-PrerrorPrerror). Equation (6)

As an example, if the target conditional error rate is 1%, then the step size up is 99 times the size of the step down. The amplitude of ΔTHupand ΔTHdncan be selected based on the desired rate of convergence for the third circuit and/or other factors.

In another project serving base station 110x measures the frequency of erasing (or frequency of false pavesini is) and adjusts the erase threshold based on the difference between the measured error rate and a target error rate (or between the frequency of false alerts and the target frequency of false alerts). The erase threshold can be adjusted using the same or different size threshold step up and down.

The erase threshold can be adjusted in various ways. In one project the service sector 110x contains a separate third circuit for each terminal and adjusts the erase threshold to achieve the required efficiency for this terminal. In another project service sector 110x supports the third circuit for all terminals and adjusts the erase threshold based on the known code words taken from these terminals. In yet another another project service sector 110x maintains a separate third circuit for each group of terminals with the same efficiency and adjusts the erase threshold based on the known code words received from all terminals in the group.

The frequency of erasing, the conditional error rate, the threshold erase and received SNR in a typical embodiment, are connected. For a given threshold erase and this received SNR provided by a specific frequency erase and specific conditional error rate. By changing the threshold Erasure by the third circuit 314 may be effected a compromise between the frequency of erasing and conditional error rate.

The internal circuit 310, an external circuit 312 and the third circuit 314 can operate at different speeds. Internally the third circuit 310 may be updated each time when the received SNR is available. External circuit 312 may be updated each time when receiving the code word. The third circuit 314 may be updated each time when receiving the code word. The refresh rate of these three paths can be selected so as to achieve the required efficiency of power control RL.

Figure 4 illustrates the project mechanism 400 power control for PC-mode "up-down". The mechanism 400 power control includes the first circuit 410 and the second circuit 412. The first circuit 410 operates between service sector 110x and the terminal 120 and the second circuit 412 is supported by the servicing sector 110x. At terminal 120, the first circuit 410 is supported by the processor 270 of the PC-mode "up-down", which includes a processor 272 indicators erase and module 274 regulation TX-power.

The first circuit 410 adjusts the transmit power of the terminal 120 to achieve the desired frequency erase. In the tertiary sector 110x module 224 calculate metrics computes a metric for each received code word. Detector 226 erase discovers erase for each received code word based on the metric and threshold erase, as described below, and generates an indicator of Erasure, which indicates whether the received code word erased or nistertal. Serving the residential sector 110x transmits indicators erase terminal 120.

At terminal 120, the processor 272 indicators erase accepts indicators erase sent by the service sector 110x, and decides on Sertoma and Nasterea for each indicator erase. Module 274 regulation can then adjust the transmit power of the terminal 120 based solutions to erase from the processor 272 as follows:

Peb(n+1)={Peb(n)+ΔPupfor decisions on Sertoma, Peb(n)-ΔPdnfor decisions on Nasterea,Ur.(7)

where ΔPupis the step size increase for solutions Sertoma, and ΔPdnis the step size reduction for solutions Nasterea.

The size of the step ΔPupΔPdncan be set based on the target frequency erase as follows:

ΔPup=ΔP dn(1-PrerasurePrerasure). Equation (8)

Service sector 110x can broadcast mode step sizes Δupand/or ΔPdnin the terminals within its coverage area. In this deployment, the target frequency of the erasing may change very slowly. Thus, the service information for transmission in broadcast mode size of the step ΔPupand/or ΔPdnmay be a small percentage of the total service information.

The second circuit 412 adjusts the erase threshold based on the received known codewords to achieve a target conditional error rate. The second circuit 412 operates as described above for the third circuit 314 figure 3.

The first circuit 410 and the second circuit 412 can operate at different speeds. The first circuit 410 may be updated each time when receiving the code word. The second circuit 412 may be updated each time when receiving the code word.

In the designs shown in figure 3 and 4, the desired level of efficiency quantitatively activae is camping by the target frequency of the erasing and the target conditional error rate. Efficiency can also be measured by other indicators, such as the target probability of false alarms, which is the probability of declaring Nesterova code words when nothing was left. Mechanisms for power control can be designed in accordance with the indicator(s)used in order to quantify the efficiency.

Various factors may be considered when selecting either PC mode "up-down", or PC-based mode erase to use. For example, PC-mode can be selected based on the target frequency of the erase speed of convergence and/or other factors. PC mode on the basis of the erasing may be similar to the PC-mode "up-down", if the target frequency erasing equal to 50%. These two PC mode can have different characteristics, if the target frequency erase differs from 50%. PC-based mode erase can be used to directly reach the target frequency erase without using an external circuit. However, the use of different sizes of step ΔPupΔPdnin PC mode on the basis of erasing may cause (1) a slower convergence to the proper power level and (2) the wider distribution of the received SNR. The frequency of erasing may also be sensitive to oshi the Cam upon detection of indicators erase especially when the definition is very high or very low frequencies erase, for example, 1% or 10%. PC-mode "up-down" uses equal step sizes up and down ΔP regardless of the target frequency erase. As a result, PC-mode "up-down" may be able to achieve (1) a more rapid convergence to the proper power level and (2) a more narrow distribution of the received SNR.

In one project PC-mode can be selected for each terminal. In another project PC mode is selected for each sector and is used for all terminals served by this sector. In another project a different PC mode is selected for each group of sectors or the entire network. All projects selected PC mode can be transmitted in the service signals to the terminal(s) by setting service message, for example bits RLCtrlPCMode described above.

The terminal can confirm the PC mode to be used for power control by reading setting service message. If this parameter specifies the PC-mode "up-down", the terminal may adjust its transmit power with the same size steps up and down based on PC commands received from the serving sector. If this parameter specifies the PC mode on the basis of erasing, the terminal can handle the indicators of the tyranny from the service sector as commands power control and can adjust its transmit power with different sizes of steps up and down on the basis of the adopted indicators erase.

The above-described power control RL provides reliable operation of the control channel used to send the code word. The transmit power of the control channel can be used as a reference power level for other control channels and data channels.

2. Detection erase

Detection erase can be performed in different ways depending on how the generated code words, and the metric selected for use. Several approximate schemes detection erase described below.

In one project, the terminal establishes a compliance report CQI (or message service signal) of L bits with one of the 2Lpossible Walsh codes of length 2L. Further, the terminal transmits the mapped Walsh code as a code word for CQI report. The terminal can scramble code word before transmission. The sector receives the transmitted codeword and performs complementary diskriminirovaniya to detect the code word.

In one project sector performs detection by reverse coding with narrowing of the spectrum of the received code word with each of the 2Lpossible Walsh codes as follows:

Ml(n )=i=12Lr(n,i)wl(i),dlIl=1,...,2L,Ur.(9)

wherer(n,i)isiI received a sample in the framen, wl(i) isith elementary Walsh code signal l, andMl(n)is the indicator value for the Walsh code l in framen.

The sector receives 2Lvalues for 2Lpossible Walsh codes, which may be transferred. The sector can compare each value with a threshold erase as follows:

ifMl(n)>THerasure,

to declare code detected Walsh l. Ur.(10)

If the code word is transmitted with sufficient power, it is likely that only one value will exceed the threshold Erasure. In this case, the Walsh code for the value of the indicator may be provided as the decoded word, and may the be declared Astarte code word. However, if all the 2Lvalues are below the threshold erase, erased code word can be declared. If multiple values exceed the threshold erase the error event can be declared, because only one Walsh code, possibly transferred. This error event can be caused by noise and interference observed by the sector, and may be more likely with a low erase threshold.

In another project sector performs detection by calculating the Euclidean distance between the received codeword and each of the 2Lpossible valid code word in the coding table, for example, as shown in equation (9). The sector may then retrieve the index as follows:

M(n)=d1(n)d2(n),Equation (11)

whered1(n)is the Euclidean distance between the received codeword in the framenand the closest valid codeword,

whered2(n)is the Euclidean distance between the received codeword in the framenand SL is blowing the nearest valid code word.

After that, the sector may compare the metric with a threshold erase as follows:

ifM(n)<THerasurethen declare Astarte code word, otherwise equation (12),

ifM(n)≥THerasurethen declare erased code word.

Other indicators can also be used to detect deletions. In General, the indicator can be based on any suitable function reliabilityf(r, C)whereris received code word, and C is the coding table of all possible code words. The functionf(r, C)should specify the quality/reliability of the received code word and must have the appropriate characteristics, for example monotonous reliability of detection.

3. Transfer of RL

Terminal 120 may use the indicators erase from the service sector 110x and poslujivshih sectors 110a-110m for transmission service RL. Terminal 120 may determine the frequency of erasing observed by each sector for the terminal 120 based on the indicators erase taken from each sector. For each sector, the terminal 120 may determine whether the indicator erase taken for this sector, erased code word or Astarte code word. Terminal 120 may count the number of erased code words within a predefined temporarily what about the window, to determine the frequency of erasing for the sector. The terminal 120 can identify the sector with the lowest frequency of washing and can choose the sector as a serving sector RL.

Terminal 120 may send a request message for transmission service in the current serving sector and/or the new selected sector. In one project the terminal 120 sends a request for resources a return line connection each time the terminal 120 wants to transmit on the reverse link. Terminal 120 may send the request for resources either (1) the current serving sector by applying an identification code for this sector, or (2) the newly selected sector by use of the identification code for this new sector. Transmission request resources in the sector can be considered as a request for transmission service in the new sector. The transfer request service can also be sent in other ways.

Transfer of RL can also be initiated by the system. In one project the sectors in the active set of the terminal 120 sends indicators erase the specified object, for example the system controller 130 in figure 1. The specified object can determine the sector, observing the optimal feedback communication line to the terminal 120, and can choose the sector in which the number of service sector RL terminal. The current serving sector and/or the new selected sector can send a service message to the terminal 120 to transmit the transfer of RL.

4. System

Figure 5 illustrates the project process 500 performed by a base station (for example, serving base station) to control the power RL terminal. Official signals that indicate PC mode selected from multiple PC modes are sent (step 510). Multiple PC modes may include PC-mode "up-down PC mode on the basis of erasing and/or any other PC mode. Official signals also can be a bit RLCtrlPCMode or any other type of service signals. Feedback control of power for the terminal is further formed in accordance with the selected PC mode (step 520). Feedback power control is used to adjust the transmit power of the terminal, and may contain PC commands, indicators erase and/or other information. Feedback control of the power is sent to the terminal (step 540). The size of the steps up and/or down, used for power control, can also go to the terminal or transmitted in broadcast mode to all terminals.

At step 520 is performed to determine whether the selected PC mode "up-down" or PC-based mode with irania (step 522). If PC mode "up-down" is selected, the signal quality for the terminal is estimated (step 524), and PC-teams are formed based on the quality of the received signal and the target signal quality (step 526). The target signal quality can be adjusted so as to achieve a target level of performance, for example, the target frequency is erased (step 528). If you select PC mode on the basis of erasing, the code words are taken from the terminal (step 534). Determines whether each received code word erased or nistertal (step 536), and indicators erase the received code words are sent (step 538).

6 illustrates the device project 600-aware power control RL terminal. The device 600 includes a means of sending a service signals, indicating PC mode selected from multiple PC modes module (610), the means of forming the feedback control of the power terminal in accordance with the selected PC mode (module 620) and a means of sending feedback control of power in the terminal module (640). The means of creating a feedback power control includes means for determining whether to use PC mode "up-down" or PC-based mode erase (module 622). For PC-mode "up-down" means the formation feedback reg is the place of power includes means for evaluating the signal quality for the terminal (module 624), the means of creating a PC-based command quality of the received signal and the target signal quality (module 626) and the means of controlling the target signal quality, so as to achieve a target level of performance, for example, the target frequency erase (module 628). For PC-based mode erase tool forming a feedback power control includes a means of receiving the code words from the terminal (module 634), a means of determining whether each code word erased or nistertal (module 636), and the means of sending indicators erase the received code words (module 638). Modules 610-640 may contain processors, electronics devices, hardware devices, electronics components, logical circuits, storage devices, etc. or any combination of the above.

7 illustrates a process 700 performed by the terminal to control the power RL. Initially the service signals indicating the PC mode selected from multiple PC modes (step 710). The transmit power is then regulated in accordance with the selected PC mode (step 720).

At step 720 is performed to determine whether the selected PC mode "up-down" or PC-based mode erase (step 722). If the selected PC mode "up-down", the PC commands are accepted (step 724), and the transmit power is adjusted according to the accordance with the received PC commands (step 726). The transmit power may be (1) increased by the step-up, if the receiving PC-team is a team up, or (2) reduced by the step down if the received PC command is the command down. The size of steps up and down can be the same in PC mode "up-down". If you select PC mode on the basis of the erase indicators erase accepted (step 734), and the transmit power is adjusted in accordance with the received indicators Erasure (step 736). The transmit power may be (1) increased by the step-up, if accepted indicator erase specifies erased codeword, or (2) reduced by the step down, if accepted indicator erase specifies Astarte code word. The size of the step up and down can be different in PC mode on the basis of the erase and can be selected based on the target frequency erase.

Code words are sent to the transmission power adjusted in accordance with the selected PC mode (step 740). The transmit power for other programs also can be adjusted based on the transmit power for the code words.

Fig illustrates the project device 800 for performing power control RL terminal. The device 800 includes a tool receiving service signals, indicating PC mode selected from multiple PC modes (module 810), the means of controlling transmission power in ACC is accordance with the selected PC mode (module 820) and a means of sending code words to transmit power, adjusted in accordance with the selected PC mode (module 840). The means for regulating the transmission power includes means for determining whether to use PC mode "up-down" or PC-based mode erase (module 822). In PC mode the "up-down" means to regulate power transmission includes a tool receiving PC commands (module 824) and the means of controlling transmission power in accordance with PC commands (module 826). In PC mode on the basis of the erase tool to regulate power transmission includes a tool receiving indicators erase the code words sent over the communication channel (module 834), and the means of controlling transmission power in accordance with the indicators erase (module 836). Modules 810-840 may contain processors, electronics devices, hardware devices, electronics components, logical circuits, storage devices, etc. or any combination of the above.

Fig.9 illustrates the project process 900 performed by the terminal to control the power RL. The transmit power is adjusted based on PC commands received from the first set of at least one base station (step 912). Transmission maintenance is performed on the basis of indicators erase taken from a second set of at least one base station (the tap 914). The first set may include only the serving base station. The second set may include the serving base station and possibly other base stations.

The terminal transmits the code word on the reverse link. For transmission service RL indicators erase for code words can be made from a second set of base station(s). The frequency of the erasing can be determined for each base station in the second set on the basis of indicators erase taken from this base station. The base station with the lowest frequency of the erasing can be selected as a new serving base station, and the transfer can be performed in the selected base station. When power regulation RL transmit power of the terminal can be increased a step up, if we accept PC-team is a team up, or reduced to step down if the received PC command is the command down.

Figure 10 illustrates the project device 1000 to perform power control RL terminal. The device 1000 includes means for regulating the transmission power based on PC commands received from the first set of at least one base station (module 1012), and means of performing transmission service on the basis of indicators erase taken from the second set, less the th least from one base station (module 1014). Modules 1012 and 1014 may include processors, electronics devices, hardware devices, electronics components, logical circuits, storage devices, etc. or any combination of the above.

11 illustrates a block diagram of the project terminal 120 serving base station 110x and posluzhivshij base station 110m in figure 1. In the serving base station 110x processor 1114x TX-data receiving data traffic from a source 1112x data and service signals from a controller/processor 1130x and Manager 1134x. The controller/processor 1130x can provide feedback (for example, PC-command and/or indicators erase)to adjust the transmit power of terminals communicating with the base station 110x, and Manager 1134x can provide destination data channels and/or subcarriers to terminals. The processor 1114x TX-data processing (for example, encodes, punctuates and performs character conversion) traffic data and service signals and provides the characters. The modulator (Mod) 1116x performs modulation symbols (for example, CDMA, OFDMA and/or other radio technologies) and provides the output of the elementary signals. A transmitter (TMTR) 1118x results in the required parameters (for example, converts to analog form, amplifies, filters and converts to raise is the group of frequency) output of the elementary signals and generates a signal straight line, which is transmitted through the antenna 1120x.

Posluzhivshaya base station 110m similar processes traffic data and service signals for terminals served by the base station 110m, and a terminal having a base station 110m in their active sets. Traffic data and service signals are processed by processor 1114m TX-data modulated by the modulator 1116m, are set to the appropriate settings via the transmitting device 1118m and transmitted via the antenna 1120m. Source 1112 data provides data to the processor 1144m. The receiver 1140m, the demodulator 1142m, the processor 1144m RX-data and the receiver 1146m data provide functions similar to the functions described for receiver j, demodulator h, processor h RX-data and receiver K data, respectively.

At terminal 120 antenna 1152 receives signals from a direct line of communication from the base station 110x and 110m and possibly other base stations. The receiving device 1154 results in the required parameters (for example, filters, amplifies, converts with decreasing frequency, and digitizes) the received signal from the antenna 1152 and provides a sample. A demodulator (Demod) 1156 performs demodulation of symbols (for example, CDMA, OFDMA and/or other radio technologies) and provides estimates of the symbols. The processor 1158 RX-data processing (for example, reverse symb is the emotional transformation reverse interleaving and decoding) evaluation of characters, provides the decoded data to the receiver 1160 data and provides the detected service signal (for example, bit RLCtrlPCMode, PC commands, indicators, erase, etc. in the controller/processor 1170.

In the back of the line processor 1182 TX-data processing data traffic from a source 1180 data and service signals (for example, code words, a request for transmission service and so on) from controller/processor 1170 and forms the characters. Symbols modulated by modulator 1184 and provides to the appropriate settings via the transmitting device 1186, to form the feedback signal line, which is transmitted from the antenna 1152. The controller 1170 may provide an indicator of the level of transmit power to use for the transfer.

In the serving base station 110x signals a return line connection from terminal 120 and other terminals are received by the antenna 1120x, are set to the appropriate settings via the receiving device 1140x, demodulated by demodulator 1142x and processed by processor 1144x RX-data. The processor 1144x provides the decoded data to the receiver 1146x data and the detected service signal (for example, code word) to the controller/processor 1130x. The receiving device 1140x can evaluate p is animemanga signal for each terminal and may provide this information to the controller/processor 1130x. The controller/processor 1130x can eject PC command and/or indicators of erasing for each terminal, as described above. Posluzhivshaya base station 110m can similarly detect utility signals (for example, code words and a request for transmission service), sent by terminal 120, and can send indicators erase in the terminal.

Controllers/processors 1130x, 1130m and 1170 controls the operations of various processing modules in the base stations 110x and 110m and the terminal 120, respectively. These controllers/processors can also perform various functions for the regulation of power and transmission services. For example, the controller/processor 1130x may implement some or all of the modules 220-232, shown in figure 3 and 4 for the base station 110x. The controller 1170 may implement some or all of the modules 258-290, shown in figure 2-4 for terminal 120. The controller 1130x can implement process 500 figure 5. The controller 1170 may also implement the processes 700 and/or 900 7 and 9. Storage device 1132x, 1132m and 1172 store data and program codes for base station 110x and 110m and terminal 120, respectively. Managers 1134x and 1134m perform dispatching terminal that communicates with a base station 110x and 110m, respectively, and assign data channels and/or the subcarriers dispatchers the own terminal.

Described in this document, the techniques may be implemented by various means. For example, these techniques may be implemented in hardware, firmware, software or combinations thereof. When implemented in hardware, the processing modules used to perform power control and transmission service can be implemented in one or several specific integrated circuits (ASIC), digital signal processors (DSPS), digital signal processing (DSPD), programmable logic devices (PLD), programmable by the user matrix BIS (FPGAs), processors, controllers, microcontrollers, microprocessors, electronic devices, other electronic units designed to perform the operations described in this document, function, or in their combinations.

When implemented in firmware and/or software techniques may be implemented with modules (for example, procedures, functions, and so on)that perform the operations described in this document functions. Firmware and/or software codes may be stored in a storage device (for example, in a storage device 1132x, 1132m or 1172 figure 11) and executed by a processor (for example, the processor 1130x, mi 1170). The storage device can be implemented within the processor or external to the processor.

Titles included in this document for reference and also to help in the search for specific topics. These headings are not intended to limit the scope of the concepts described here, and these concepts may have applicability in other sections throughout the detailed description.

The preceding description of the invention provided to enable any person skilled in the art to make or use the invention. Various modifications in the invention should be obvious to a person skilled in the art, as described in this document, the General principles can be applied to other variations without departure from the essence and scope of the invention. Thus, the invention is not intended to be limited described in this document are examples and must satisfy the widest extent consistent with the principles and new features, disclosed in this document.

1. Device for performing power control and transmission of the service, contains:
at least one processor is configured to adjust the transmit power based on the command transmission power (PC), take the x from the first set, consisting of at least one base station, to transmit code words to transmit power is adjusted based on the received PC commands, and receive indicators erase for code words of the second set, consisting of at least one base station, and transfer services on the basis of indicators erase taken from the second set, consisting of at least one base station; and
a storage device that is connected to at least one processor.

2. The device according to claim 1, the first set includes one base station specified by the serving base station, and the second set includes a serving base station.

3. The device according to claim 1, in which the at least one processor is configured to determine the frequency of erasing for each base station in the second set, consisting of at least one base station on the basis of indicators erase taken from this each base station to identify the selected base station with the lowest frequency erase and transfer service to the selected base station.

4. The device according to claim 1, in which the at least one processor is configured to increase the transmit power step up, if we accept PC-team is the team up, and the mind is nishat transmit power step down if we accept PC-team is the team down.

5. The method performed by a terminal for power control and transmission of the service, contains the steps are:
adjust transmit power based on the command transmission power (PC), taken from the first set, consisting of at least one base station;
transmit code words to transmit power is adjusted based on the received PC commands;
take indicators erase for code words of the second set, consisting of at least one base station; and
perform the transmission service on the basis of indicators erase taken from the second set, consisting of at least one base station.

6. The method according to claim 5, in which the execution of the transfer service includes the steps are:
determine the frequency of erasing for each base station in the second set, consisting of at least one base station on the basis of indicators erase taken from this each base station;
identify the selected base station with the lowest frequency of erasing; and
perform the transfer of the selected base station.

7. Device for performing power control and transmission of the service, contains:
means for controlling the transmission power based on the power transmission is (PC), taken from the first set, consisting of at least one base station;
means for transmitting the code words in the transmit power is adjusted based on the received PC commands;
means for receiving indicators erase for code words of the second set, consisting of at least one base station; and
means for performing transmission service on the basis of indicators erase taken from the second set, consisting of at least one base station.

8. The device according to claim 9, in which the means for performing transmission service includes:
the means for determining the frequency of erasing for each base station in the second set, consisting of at least one base station on the basis of indicators erase taken from this each base station;
means for identifying the selected base station with the lowest frequency of erasing; and
means for performing transmission service in the selected base station.

9. Read by the processor, the storage medium for storing commands for performing power control and transmission service, while the commands are used for:
regulation of the transmission power on the basis of the command transmission power (PC), taken from the first set, consisting of at least one base station;
front and code words to transmit power, adjusted based on the received PC commands;
receiving indicators erase for code words of the second set, consisting of at least one base station; and
complete transmission service on the basis of indicators erase taken from the second set, consisting of at least one base station.



 

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