• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a mobile communication system, and more particularly, to a power control method in a multi-channel transmission. A mobile communication system in which a hybrid ARQ scheme according to the present invention is used, the method comprising: transmitting data through an auxiliary channel to a receiver by a transmitter at a constant ratio of reference signal power; Receiving, by a receiving end, a reception state from the decoded signal of the transmitted signal and transmitting the received state to the transmitting end; And adjusting the power ratio of the auxiliary channel signal with respect to the reference signal of the transmitter in accordance with the state and transmitting it to the receiver.
    公开号:KR20030000007A
    申请号:KR1020010035629
    申请日:2001-06-22
    公开日:2003-01-03
    发明作者:윤영우；이영조；김기준；권순일；윤석현
    申请人:엘지전자 주식회사；
    IPC主号:
    专利说明:

    {Method for power control of multi-channel signal in mobile communication system}
    [3] The present invention relates to a mobile communication system, and more particularly, to a signal power control method using an ACK / NAK signal in the transmission of a multi-channel signal.
    [4] In the third generation CDMA mobile communication system, the mobile station transmits multiple traffic channels simultaneously in order to provide various multimedia services such as voice, video, and data, instead of transmitting only one traffic channel as in the IS-95A. Has a channel structure.
    [5] In addition, in the reverse link, the base station performs coherent demodulation to improve performance. The mobile station transmits a pilot channel with multiple traffic channels so that the base station performs synchronous demodulation for the traffic channel.
    [6] The traffic-to-pilot power ratio of the traffic channel to the pilot channel is determined by the coding rate, the desired signal to interference ratio (hereinafter abbreviated as SIR), and the transmission rate. And so on.
    [7] 1 is a block diagram illustrating a signal generation process in a multi-channel transmission according to the prior art.
    [8] As shown in FIG. 1, the mobile station passes the pilot channel and traffic channels (dedicated control channel, auxiliary channel, base channel) through a spreading unit 110 and a baseband filter 106. Transmitted to the base station.
    [9] In this case, the gain is adjusted by the relative gain unit 102 so that each traffic channel is transmitted with the transmission power ratios G F , G C , and G S relative to the transmission power of the pilot channel before spreading.
    [10] Here, G F represents a relative transmission power ratio of a fundamental channel for transmitting information such as voice, and G C represents a relative transmission power ratio of a dedicated control channel used for transmitting dedicated control information. And, G S is a value indicating the relative transmission power ratio of the supplemental channel (supplemental channel) used for transmitting data.
    [11] The transmit power of the pilot channel is controlled by closed-loop power control over the reverse link.
    [12] The transmit power control of the traffic channels is controlled in such a manner that the relative transmit power ratio of the traffic channel to the pilot channel is kept constant.
    [13] The closed loop power control is performed in two ways.
    [14] First, there is an inner loop power control scheme that measures the SIR of the received signal from the signal power of the pilot channel, and transmits the power control bits over the forward link by comparing the SIR with the power control threshold.
    [15] Second, an outer-loop power control scheme that periodically adjusts the power control threshold to maintain a desired frame error rate (hereinafter, abbreviated as FER) in a wireless channel that changes with time. have.
    [16] The outer loop power control scheme is not a problem when the mobile station transmits only one traffic channel. However, in a multichannel structure in which a plurality of traffic channels with different target FERs are transmitted, the rising step size for raising the power control threshold for each traffic channel is the same, but the falling step size varies depending on the FER.
    [17] For example, in a system requiring a 1% target FER, if the base step size of the outer loop power control is 1 dB, the falling step size of the traffic channel is "1/99", but requires a 5% target FER. In the system, the falling step size of the traffic channel is "1 / (1 / 0.05-1) = 1/19".
    [18] In addition, when multiple channels are used in multiplexing, the code rate used in each channel may be different. Therefore, although the power of one specific traffic channel may be adjusted based on the power control threshold according to one code rate, in this case, it is not appropriate to apply the adjusted threshold to the transmit power of channels having different code rates. You may not.
    [19] Therefore, in a structure in which power control for multiple channels is performed using one reverse power control bit, the base station measures the power of the pilot channel and compares the estimated SIR value with one power control threshold, thereby providing a plurality of traffics. Since the outer loop power control considering the target FER of the channel is not performed and the outer loop is performed only for one specific traffic channel, the performance of another traffic channel is degraded.
    [20] Accordingly, an object of the present invention has been made in view of the above-mentioned problems of the prior art, and uses an ACK / NAK command in a multi-channel signal transmission method in a mobile communication system for preventing performance degradation of a specific channel. It is to provide a power control method of the signal.
    [21] According to an aspect of the present invention for achieving the above object, in a mobile communication system using a hybrid ARQ scheme, the transmitting end data through the auxiliary channel to the receiving end at a constant ratio of the reference signal power Transmitting; Receiving, by a receiving end, a reception state from the decoded signal of the transmitted signal and transmitting the received state to the transmitting end; And adjusting the power ratio of the auxiliary channel signal with respect to the reference signal of the transmitter in accordance with the state and transmitting it to the receiver.
    [22] Preferably, when the reception state is reported to the transmitter, the relative signal power ratio of the auxiliary channel signal with respect to the reference signal of the transmitter is lowered, and when it is reported that it is not good, Raise the relative signal power ratio of the auxiliary channel signal.
    [23] Meanwhile, when the receiver requests retransmission of a signal to the transmitter, the transmitter transmits a signal including the same signal as the previous transmission signal or additional information for error correction to the receiver, whether the transmitted signal is a frame error. When the frame error does not occur, the acknowledgment signal is transmitted, and when the frame error occurs, the non-ACK signal is transmitted to the transmitting end. Be aware of this. In this case, the frame error is measured by a cyclic redundancy check (CRC) code. In addition, the reporting of the frame error is made at the frame rate.
    [1] 1 is a block diagram illustrating a signal generation process in a multi-channel transmission according to the prior art.
    [2] 2 is a flowchart illustrating a signal power control process for multi-channel transmission according to the present invention.
    [24] In the present invention, the reverse channel of the mobile communication system uses a primary channel and an auxiliary channel at the same time.
    [25] Hybrid type automatic repeat reQuest (hereinafter referred to as HARQ) scheme is used for signal transmission through the auxiliary channel. Since the voice signal through the basic channel is a signal sensitive to delay, it is preferable not to use the HARQ scheme.
    [26] In order to support this HARQ, an ACK / NACK signal is transmitted through a forward channel. Transmission power control for the auxiliary channel uses a closed loop power control scheme. At this time, the present invention performs the outer loop power control method using the ACK / NACK signal.
    [27] The HARQ method combines an error correction and error detection method with an Automatic Repeat Request (ARQ).
    [28] In general, the HARQ scheme is largely divided into three types.
    [29] Type I HARQ means that when an error occurs in the first transmission, the same information is transmitted even when retransmission, and the receiver uses a chase combining form.
    [30] The type II HARQ scheme and the type III HARQ scheme increase the redundancy in each transmission. The receiver combines the codes of the first transmission signal or the retransmission signal and consequently lowers the code rate. . That is, the type II HARQ scheme and the type III HARQ scheme increase coding gain compared to chase combining.
    [31] In this case, the type II HARQ scheme and the type III HARQ scheme are distinguished from each other by type II when each transmission information is not self-decodable and type when self-decodable. It is divided into III.
    [32] Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.
    [33] 2 is a flowchart illustrating a signal power control process for multi-channel transmission according to the present invention.
    [34] As shown in Fig. 2, the base station receives the reverse link pilot signal from the mobile station and measures the SIR of the pilot signal in units of a power control group of 1.25 ms units (S10, S11, S12).
    [35] This measured SIR is compared with a predetermined power control threshold. According to the comparison result, the base station generates a power control signal. Generate a power control signal to drop power if the SIR value is greater than the power control threshold. Conversely, a power control signal is generated to power up when the SIR value is less than the power control threshold. (S13)
    [36] In accordance with this power control signal, the mobile station changes the transmit power of the pilot signal by ΔdB (rising or falling). This method is called an inner loop power control method, which is one of the closed loop power control methods. (S14)
    [37] Then, each channel for each power control group unit (1.25ms) so that the transmission power of the basic channel, the dedicated control channel, and the auxiliary channel becomes a constant ratio (G F , G C , G S ) to the transmission power of the changed pilot signal. Change their transmit power.
    [38] In addition to the inner loop power control method, the outer loop power control adjusts a power control threshold used in the inner loop in units of frame rates of the base channel. This is done by adjusting the power control threshold so that the FER of the base channel can be a certain value.
    [39] First, the cyclic redundancy check (hereinafter, referred to as CRC) of the basic channel is checked, and when it is "good", the power control threshold is lowered. This downward threshold is " However, if the CRC is " bad, " the power control threshold is raised. At this time, the amount of increase in the threshold is δ dB. Here, δ is a step size of the outer loop power control that adjusts the power control threshold. denotes a base unit, FER fundamental indicates the target FER of the main channel. this fundamental FER is measured by the CRC check. (S15, S16, S17)
    [40] By adjusting the threshold of the power control through this outer loop power control method, it is possible to adjust the FER of the basic channel to the desired target FER on average.
    [41] However, adjusting the power control threshold in this manner as described above may degrade the performance of the auxiliary channel. In order to solve this problem, the present invention uses an ACK / NACK signal for outer loop transmit power control on an auxiliary channel.
    [42] As described above, it is basically assumed that the reverse auxiliary channel uses the HARQ scheme. Thus, every 20 ms, the base station sends an ACK or NACK signal for the reverse auxiliary channel to the mobile station.
    [43] That is, the mobile station checks the CRC of the reverse auxiliary channel and, if "good", transmits an ACK signal to the mobile station. In contrast, when the CRC is "bad", the NACK signal is transmitted to the mobile station. In case of "bad", since the base station cannot decode the corresponding auxiliary channel signal, the mobile station retransmits the same signal as the auxiliary channel signal or transmits a signal requiring additional information for decoding the auxiliary channel signal. (S18, S19, S20)
    [44] The additional information includes redundancy bits generated from the same information bits. For example, in an encoding scheme using a turbo code, systemic bits and parity bits are generated from input information bits, which are punctured and transmitted during a transmission process. The redundancy bit represents a parity bit not transmitted in this process.
    [45] The mobile station receiving the ACK / NACK signal adjusts the G S value of the reverse auxiliary channel according to this signal. If the signal transmitted by the base station is ACK, the mobile station determines the value of G S. " Down by dB. On the contrary, if the signal transmitted by the base station is a NACK signal, the mobile station raises the value of G S by γ dB.
    [46] Here, γ represents the basic step size to be used in the outer loop power control for the auxiliary channel, and FER supplemental represents the target FER of the auxiliary channel. This FER is measured by CRC check (S21).
    [47] As described above, when the hybrid ARQ process is operated on the auxiliary channel of the reverse link, it is possible to control the outer loop transmit power for the auxiliary channel by using the ACK / NACK signal transmitted by the base station.
    [48] Through this process, when the channels of the multiple reverse links are multiplexed, it is possible to effectively prevent the degradation of the auxiliary channel that may occur when adjusting the outer loop threshold using only the target FER of the base channel.
    [49] In addition, when transmitting the packet type data which is not sensitive to delay through the reverse auxiliary channel, data throughput may be increased by using a hybrid ARQ technique of the physical layer.
    [50] Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.
    [51] Therefore, the technical scope of the present invention should not be limited to the contents described in the examples, but should be defined by the claims.
    权利要求:
    Claims (7)
    [1" claim-type="Currently amended] In a mobile communication system using a hybrid ARQ scheme,
    Transmitting, by a transmitter, data through an auxiliary channel to a receiver at a constant ratio of reference signal power;
    Receiving, by a receiving end, a reception state from the decoded signal of the transmitted signal and transmitting the received state to the transmitting end;
    And adjusting the power ratio of the auxiliary channel signal with respect to the reference signal of the transmitter according to the state and transmitting the power ratio to the receiver.
    [2" claim-type="Currently amended] The method of claim 1, wherein when the reception state is reported to the transmitter, the relative signal power ratio of the auxiliary channel signal to the reference signal of the transmitter is decreased.
    [3" claim-type="Currently amended] The method of claim 1, wherein the relative signal power ratio of the auxiliary channel signal with respect to the reference signal of the transmitter is increased when it is reported to the transmitter that the reception state is not good.
    [4" claim-type="Currently amended] 2. The multi-channel of claim 1, wherein when the receiving end requests retransmission of a signal to the transmitting end, the transmitting end transmits a signal to the receiving end, the same signal as the previous transmission signal or additional information for error correction. How to control the power of the signal.
    [5" claim-type="Currently amended] The method of claim 1, wherein the transmission signal determines whether a frame error is detected, and if no frame error is transmitted, an acknowledgment (ACK) signal, and if a frame error occurs, non-acknowledgement (Non-ACK). A method of controlling power of a multi-channel signal by transmitting a signal to a transmitting end so that the transmitting end grasps a signal receiving state of the receiving end.
    [6" claim-type="Currently amended] 4. The method of claim 3, wherein the frame error is measured by a cyclic redundancy check (CRC) code.
    [7" claim-type="Currently amended] 4. The method of claim 3, wherein the reporting of frame error is at a frame rate.
    类似技术:
    公开号 | 公开日 | 专利标题
    JP5161357B2|2013-03-13|Method and apparatus for controlling reverse link data rate of a mobile station in a communication system with reverse link common rate control
    JP5080666B2|2012-11-21|Reverse link channel architecture for wireless communication systems
    JP5074573B2|2012-11-14|Apparatus, system, and method for managing reverse link communication
    JP5269930B2|2013-08-21|Control of power margin in data communication system
    JP2014027682A|2014-02-06|Method of increasing capacity of enhanced data channel on uplink in wireless communications system
    US7590181B2|2009-09-15|Adaptive modulation and coding
    KR101049633B1|2011-07-14|Power control method and apparatus for wireless communication system
    RU2371862C2|2009-10-27|Controlling power by means of delete procedures
    TWI279147B|2007-04-11|Mitigation of link imbalance in a wireless communication system
    EP1508213B1|2010-03-24|Apparatus and method for dynamically selecting an arq method
    KR100704355B1|2007-04-09|Mobile station, mobile communication system, and mobile communication method
    EP1500220B1|2008-01-02|Communication system using arq
    US7600170B2|2009-10-06|Operation of a forward link acknowledgement channel for the reverse link data
    KR101019391B1|2011-03-07|A method and apparatus of using a single channel to provide acknowledgement and assignment messages
    EP1516440B1|2007-05-09|Outer loop uplink power control during link imbalance
    US8045513B2|2011-10-25|Method and apparatus for transmitting and receiving downlink control information in a mobile communication system supporting uplink packet data
    KR100516686B1|2005-09-22|Hybrid automatic repeat request method for cdma mobile system
    US7433328B2|2008-10-07|Packet transmission method
    US7440399B2|2008-10-21|Apparatus and method for efficient transmission of acknowledgments
    RU2302694C2|2007-07-10|Method and device for controlling return communication line traffic in mobile communication system
    JP2013211856A|2013-10-10|User equipment
    JP5265502B2|2013-08-14|Method and system for data transmission in a communication system
    US6678523B1|2004-01-13|Closed loop method for reverse link soft handoff hybrid automatic repeat request
    RU2386215C2|2010-04-10|Method for transfer of information content
    AU2002319919B2|2005-02-24|Reverse transmission apparatus and method for improving transmission throughput in a data communication system
    同族专利:
    公开号 | 公开日
    KR100763373B1|2007-10-04|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2001-06-22|Application filed by 엘지전자 주식회사
    2001-06-22|Priority to KR1020010035629A
    2003-01-03|Publication of KR20030000007A
    2007-10-04|Application granted
    2007-10-04|Publication of KR100763373B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1020010035629A|KR100763373B1|2001-06-22|2001-06-22|Method for power control of transmitting signal in mobile communication system|
    [返回顶部]