CN102325362A - Power control method, system and equipment - Google Patents
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Abstract
The embodiment of the invention discloses a power control method, system and equipment, relating to the technical field of wireless communication and being used for increasing the success rate of data transmission. In the invention, the power control method comprises the steps of: determining whether a transmission power control (TPC) command word sent by a data receiving end is not demodulated at a current subframe or whether the quality of a signal sent by the data receiving end is lower than a preset quality threshold, by a data sending end; and when the determination of the data sending end is positive, turning up the signal sending power of the data receiving end, and sending data to the data receiving end at the current subframe by using the turned-up power. According to the invention, the success rate in data transmission can be increased.
Description
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a power control method, system and device.
Background
In a time division synchronous code division multiple access (TD-SCDMA) system, the third generation mobile communication standardization organization (3GPP)25.224R4 protocol has the following specifications: the Radio Link Control (RLC) layer delivers signaling data to the Radio Resource Control (RRC) layer over a Signaling Radio Bearer (SRB) in the control plane. Signaling data is generally transmitted in an Acknowledged (AM) mode, that is, when an RLC layer of a transmitting end is configured in an AM mode, the transmitting end starts an acknowledged timed polling (AMTimerPoll) timer after transmitting a Protocol Data Unit (PDU), and if the AMTimerPoll timer does not receive feedback information of the terminal before timeout, the PDU is directly retransmitted; when the retransmission times reach the maximum retransmission times, the RLC layer of the sending end sends a restart (Reset) instruction to the RLC layer of the receiving end, and starts a Timer _ RST Timer; if a restart acknowledgement (Reset ACK) message returned by the terminal is not received before the timeout of the Timer _ RST Timer, the sending end executes the following steps:
step 1: the sending end adds 1 to the state variable VT (RST);
step 2: if VT (RST) is less than MaxRST, the sending end sets the RESET PDU according to the method of starting setting, sends the RESET PDU to the terminal, and then restarts the Timer _ RST;
if the state variable VT (RST) is MaxRST, the transmitting end terminates the RLC RESET process in progress and indicates unrecoverable errors to higher layers. If the Timer _ RST is in the start state, the Timer needs to be stopped.
For downlink, since the sending RLC entity is inside the Radio Network Controller (RNC), the RNC can directly know the unrecoverable error and trigger link release, which results in a dropped call of the terminal, where the reason for the dropped call is that the radio link control error timer expires (RLC error timer). For example, the network side issues a physical channel reconfiguration message and a measurement control message, if the terminal does not receive or cannot correctly demodulate the issued message due to interference or weak coverage or the terminal receives the message and then sends an ACK feedback but the network side does not receive the feedback, the network side retransmits the message after a certain time interval until the maximum retransmission times is reached, and then the link is torn down.
For uplink, the RLC entity is sent on the terminal side, when an unrecoverable error occurs, the terminal reports a Cell Update (Cell Update) message, wherein the Update cause carried in the Cell Update message is a 6-RLC unrecoverable error (6-RLC _ unrecoverable error), after the RNC receives the Cell Update message, the RNC sends a common control channel Cell Update confirmation (CCCH Cell Update confirm) reconfiguration message through a Forward Access Channel (FACH) to try to save the error, and if a corresponding reconfiguration Complete (Complete) message is not received within a certain time, a call drop is triggered, because of Cell Update configuration timer timeout (Cell Update configuration timeout of UE) of the terminal.
Voice of the UU interface user plane, packet data and signaling data of the control plane are all sent from the user plane as user data. The user plane adopts a Frame Protocol (FP) to encapsulate data of the UU interface control plane and the user plane into frames, and the frames are transmitted in a transparent mode at a physical layer. The data frame may include signaling data and service data, and when the physical layer power control is performed, the signaling data and the service data are not distinguished and are power controlled together. The RLC layer is configured for signaling data retransmission that occurs when in AM mode, and no additional processing is done when the physical layer power is controlled.
The 3GPP 25.224R4 protocol specifies that the uplink power control procedure of the Dedicated Physical Channel (DPCH) is as follows: the closed loop power control is performed by using the Transmission Power Control (TPC) symbol on the DPCH, the dynamic range of the power adjustment is 80dB, and the power control step size can be 1, 2 or 3 dB. The initial transmit power of the uplink DPCH is indicated by the higher layer. Closed loop power control is based on signal-to-interference ratio (SIR), and the TPC process is described as follows: in the power control process, a base station (Node B) periodically performs SIR measurement on a signal received from a terminal, compares a measured value of SIR with a target value of SIR, sets an uplink TPC command sent to the terminal to up (up) if the measured value is smaller than the target value, and sets the uplink TPC command to down (down) if the measured value is larger than the target value. And on the terminal side, carrying out soft decision on the received uplink TPC bit, if the decision result is up, increasing the transmitting power by one step by the terminal, and if the decision result is down, reducing the transmitting power by one step by the terminal. The target value of SIR is adjusted by the higher layer through the outer loop. This scheme allows quality-based power control. When the terminal cannot receive the TPC bit due to loss of synchronization, the transmitting power of the terminal is kept at a fixed value; when the base station is unable to make SIR measurements due to loss of synchronization, the uplink TPC commands sent during the loss of synchronization are always set to up.
The 3GPP 25.224R4 protocol specifies that the downlink power control process of the DPCH is as follows: the initial transmit power of the downlink dedicated physical channel is set by the network until the first uplink DPCH arrives. The subsequent transmit power is closed loop controlled using the SIR. The terminal periodically measures SIR of a signal received from the base station, sets a downlink TPC command sent to the base station to down when the measured SIR value is larger than a target SIR value, and sets the downlink TPC command to up when the measured SIR value is smaller than the target SIR value. At Node B side, soft decision is made to the received down TPC bit, if the decision result is down, the base station decreases the transmitting power by a power control step length, if the decision result is up, the base station increases the transmitting power by a step length. When the base station can not receive the TPC bit due to loss of synchronization, the transmitting power of the downlink special physical channel is kept at a fixed value; when the terminal can not measure SIR due to loss of synchronization, the downlink TPC command sent during the loss of synchronization is always set to up.
In the process of implementing the invention, the inventor finds that the following technical problems exist in the prior art:
in the prior art, in the downlink power control process of the DPCH, if the base station side does not receive the downlink TPC command word, the transmission power of the base station is kept at a fixed value; similarly, in the uplink power control process of the DPCH, if the terminal side does not receive the uplink TPC command word, the transmit power of the terminal will be maintained at a fixed value. For example, when the signaling data is retransmitted, it indicates that the quality of the current UU port cannot reliably transmit the signaling data, and if the signaling data is retransmitted with fixed transmission power because the TPC command word is not received, the probability of successful retransmission of the signaling data is very small.
Disclosure of Invention
The embodiment of the invention provides a power control method, a power control system and power control equipment, which are used for improving the success rate of data transmission.
A method of power control, the method comprising:
the data sending end determines whether the transmission power control TPC command word sent by the data receiving end is not demodulated in the current subframe or whether the quality of the signal sent by the data receiving end is lower than a preset quality threshold or not;
and when the data sending end determines that the subframe is the subframe, the data sending end increases the signal sending power of the data receiving end, and sends data to the data receiving end in the current subframe by using the increased power.
A power control apparatus, the apparatus comprising:
a determining unit, configured to determine whether a transmission power control TPC command word sent by a data receiving end is not demodulated in a current subframe or whether quality of a signal sent by the data receiving end is lower than a preset quality threshold;
and the sending unit is used for increasing the signal sending power of the data receiving end when the determination result is yes, and sending data to the data receiving end in the current subframe by using the increased power.
A wireless communication system, the system comprising:
the base station is used for determining whether the transmission power control TPC command word sent by the terminal is demodulated in the current subframe or not or whether the quality of the signal sent by the terminal is lower than a preset quality threshold or not; if so, increasing the signal transmission power of the terminal, and transmitting data to the terminal in the current subframe by using the increased power;
and the terminal is used for receiving the data sent by the base station.
A wireless communication system, the system comprising:
the terminal is used for determining whether the transmission power control TPC command word sent by the base station is demodulated in the current subframe or not or whether the quality of the signal sent by the base station is lower than a preset quality threshold or not; if so, increasing the signal transmission power of the base station, and transmitting data to the base station in the current subframe by using the increased power;
and the base station is used for receiving the data sent by the terminal.
In the scheme provided by the embodiment of the invention, when the data sending end does not demodulate the TPC command word sent by the data receiving end in the current subframe or the quality of the signal sent by the data receiving end is lower than the preset quality threshold, the data sending end increases the signal sending power of the data receiving end, and sends data to the data receiving end in the current subframe by using the increased power.
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FIG. 1 is a schematic flow chart of a method provided by an embodiment of the present invention;
FIG. 2A is a schematic flow chart of a third method according to an embodiment of the present invention;
fig. 2B is a schematic diagram of an uplink outer loop power control frame structure in the embodiment of the present invention;
FIG. 3 is a schematic diagram of a system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.
Detailed Description
In order to improve the success rate of data transmission, in the method, when a data transmitting end does not demodulate a TPC command word sent by a data receiving end in a current subframe or the quality of a signal sent by the data receiving end is lower than a preset quality threshold, the data transmitting end increases the signal transmitting power of the data receiving end, and transmits data to the data receiving end in the current subframe by using the increased power.
Referring to fig. 1, a power control method provided in an embodiment of the present invention includes the following steps:
step 10: the data sending end determines whether a TPC command word sent by a data receiving end is not demodulated in a current subframe (namely an uplink time slot of the current subframe) or whether the quality of a signal sent by the data receiving end is lower than a preset quality threshold;
here, when determining whether the quality of the signal sent by the data receiving end is lower than a preset quality threshold, it may be specifically determined whether a signal-to-interference ratio (C/I) value of the signal sent by the data receiving end is lower than a preset C/I threshold, and if the C/I value of the signal sent by the data receiving end is lower than the C/I threshold, it indicates whether the quality of the signal sent by the data receiving end is lower than the preset quality threshold, otherwise, it indicates that the quality of the signal sent by the data receiving end is higher than the preset quality threshold.
Step 11: when determining that the TPC command word sent by the data receiving end is not demodulated in the current subframe or the quality of the signal sent by the data receiving end is lower than a preset quality threshold, the data sending end increases the signal sending power of the data receiving end, and sends data to the data receiving end in the current subframe (namely the downlink time slot of the current subframe) by using the increased power. Here, data may be transmitted to a data receiving end through a DPCH.
Here, the signal transmission power of the data receiving end may be increased according to a preset power adjustment step, for example, if the preset power adjustment step is 1dB, the signal transmission power of the data receiving end is increased by 1dB on the basis of an original power value, which may be a transmission power value used for transmitting data to the data receiving end at the latest time.
Preferably, before the data sending end determines whether the TPC command word sent by the data receiving end is not demodulated in the current subframe or whether the quality of the signal sent by the data receiving end is lower than a preset quality threshold, a Radio Link Control (RLC) layer of the data sending end may first determine whether data currently required to be sent is retransmission data or a Reset (Reset) instruction; if so, sending a data enhancement power control instruction to the physical layer; here, the data currently required to be transmitted may be signaling data or traffic data.
The specific implementation of step 10 and step 11 is as follows:
after receiving a data enhancement power control instruction sent by an RLC layer, a physical layer of a data sending end determines whether a TPC command word sent by a data receiving end is not demodulated in a current subframe or whether the quality of a signal sent by the data receiving end is lower than a preset quality threshold; and if so, increasing the signal transmission power of the data receiving end, and transmitting data to the data receiving end in the current subframe by using the increased power.
Here, the physical layer may increase the signal transmission power of the data receiving end according to a power adjustment step size carried in a data enhanced power control instruction stored in advance or sent by the RLC layer.
Specifically, the RLC layer of the data sending end determines whether data that needs to be sent currently is retransmission data, and the implementation is as follows:
if the RLC layer of the data sending end does not receive the feedback information of the data receiving end aiming at the Protocol Data Unit (PDU) after sending the PDU carrying the data to the data receiving end within a set time period, determining that the PDU needs to be retransmitted and the data needing to be sent currently are retransmitted data.
The RLC layer of the data sending end determines whether data to be sent currently is a Reset instruction, and the specific implementation is as follows:
and if the number of times that the RLC layer of the data sending end retransmits the PDU to the data receiving end reaches the preset maximum retransmission number or the feedback information of the data receiving end aiming at the Reset instruction is not received in the set time period after the Reset instruction is sent to the data receiving end, determining that the data needing to be sent at present is the Reset instruction.
Preferably, after receiving the data enhanced power control instruction sent by the RLC layer, the physical layer of the data sending end performs the following operations for each of the next N subframes:
determining whether the TPC command word sent by a data receiving end is not demodulated in the current subframe or whether the quality of a signal sent by the data receiving end is lower than a preset quality threshold or not; and if so, increasing the signal transmission power of the data receiving end, and transmitting data to the data receiving end in the current subframe by using the increased power. N is an integer of not less than 1.
Specifically, the RLC layer may use a Frame Protocol (FP), an IUB control protocol, or a Radio Resource Control (RRC) protocol to send a data enhanced power control indication to the physical layer.
Preferably, after the data sending end determines that the TPC command word sent by the data receiving end is not demodulated in the current subframe or the quality of the signal sent by the data receiving end is lower than a preset quality threshold, the data sending end may send the TPC command word to the data receiving end to indicate the data receiving end to increase the signal transmission power, that is, to set the TPC command word to up.
In the method, a data sending end comprises a Radio Network Controller (RNC) and a base station, and a data receiving end is a terminal; or, the data sending end is a base station, and the data receiving end is a terminal; or, the data sending end is a terminal, and the data receiving end is a base station.
The invention is illustrated below with reference to specific examples:
the first embodiment is as follows:
step 1: when the RLC layer of the network side needs to send data to the terminal, sending a data enhancement power control instruction to the physical layer;
step 2: after receiving the data enhancement power control instruction, the physical layer performs the following operations for each subframe in the next N subframes: determining whether the downlink TPC command word sent by the terminal is not demodulated in the current subframe or whether the quality of the signal sent by the terminal is lower than a preset quality threshold or not; and if so, increasing the signal transmission power of the terminal, transmitting data to the terminal in the current subframe by using the increased power, setting the uplink TPC command word to be up, and transmitting the up TPC command word to the terminal.
Example two:
step 1: when the RLC layer of the terminal needs to send data to the base station, sending a data enhancement power control instruction to the physical layer;
step 2: after receiving the data enhancement power control instruction, the physical layer performs the following operations for each subframe in the next N subframes: determining whether the uplink TPC command word sent by the base station is not demodulated in the current subframe or whether the quality of the signal sent by the base station is lower than a preset quality threshold or not; and if so, increasing the signal transmission power of the base station, transmitting data to the base station in the current subframe by using the increased power, setting the command word of the downlink TPC to be up, and transmitting the command word to the base station.
Example three:
as shown in fig. 2A, the base station side (downlink) processing flow is as follows:
step 1: when the RLC layer of the network side needs to send data to the terminal, determining whether the data needing to be sent is retransmission data or a Reset command, if so, going to step 4; otherwise, go to step 2;
step 2: the RLC layer sends a data enhancement power control instruction to the physical layer;
and step 3: after receiving the data enhancement power control instruction, the physical layer performs the following enhancement power control processing:
for each of the next N (the value of N may be changed by configuration) subframes, the following operations are performed: determining whether the downlink TPC command word sent by the terminal is not demodulated in the current subframe or whether the quality of the signal sent by the terminal is lower than a preset quality threshold or not; if yes, increasing the signal transmission power of the terminal, and going to step 5;
and 4, step 4: performing power control processing according to the prior art;
and 5: and transmitting data to the terminal in the current subframe by using the power after the power control processing, setting the uplink TPC command word to be up, and transmitting the uplink TPC command word to the terminal.
In this embodiment, the network side transmits data in an AM mode, starts an amtim poll timer after the network side transmits a PDU carrying data, and directly retransmits the PDU if the timer is out of time (no terminal feedback is received). And when retransmitting data every time, the RLC layer sends a data enhancement power control instruction to the physical layer so as to instruct the physical layer to enhance the sending of the data frame containing the retransmitted data.
When the retransmission times reach the maximum, the RLC layer sends a Reset instruction to the terminal. And each time the Reset instruction is sent, the RLC layer sends a data enhanced power control instruction to the physical layer so as to instruct the physical layer to enhance the sending of the data frame containing the Reset instruction data.
Example four:
as shown in fig. 2A, the terminal side (uplink) processing flow is as follows:
step 1: when the RLC layer of the terminal needs to send data to the base station, determining whether the data needing to be sent is retransmission data or a Reset instruction, if so, going to step 4; otherwise, go to step 2;
step 2: the RLC layer sends a data enhancement power control instruction to the physical layer;
and step 3: after receiving the data enhancement power control instruction, the physical layer performs the following enhancement power control processing:
for each of the next N (the value of N may be changed by configuration) subframes, the following operations are performed: determining whether the uplink TPC command word sent by the base station is not demodulated in the current subframe or whether the quality of the signal sent by the base station is lower than a preset quality threshold or not; if yes, increasing the signal transmission power of the base station, and going to step 5;
and 4, step 4: performing power control processing according to the prior art;
and 5: and transmitting data to the base station in the current subframe by using the power after the power control processing, setting the downlink TPC command word to up, and transmitting the up-down TPC command word to the base station.
In this embodiment, the terminal transmits data in an AM mode, starts an AMTimerPoll timer after the terminal sends a PDU of the data, and directly retransmits the PDU if the timer is out of time (no network side feedback is received). And when retransmitting data every time, the RLC layer sends a data enhancement power control instruction to the physical layer so as to instruct the physical layer to enhance the sending of the data frame containing the retransmitted data.
When the retransmission times reach the maximum, the RLC layer sends a Reset command to the base station. And each time the Reset instruction is sent, the RLC layer sends a data enhanced power control instruction to the physical layer so as to instruct the physical layer to enhance the sending of the data frame containing the Reset instruction.
In the above embodiment, the method for sending the data enhanced power control instruction to the physical layer by the RLC layer may be as follows:
the RLC layer may send a data enhanced power control indication to the physical layer through the FP frame.
For the network side, the FP frame may be an uplink outer loop power control frame defined in the 3GPP 25.427R4 protocol, and the payload part structure of the frame is shown in fig. 2B. The uplink signal-to-noise ratio TARGET value (UL _ SIR _ TARGET) can be used for representing the power adjustment step size, the value range of UL _ SIR _ TARGET in the prior art is 0-255, and represents-8.2 db-17.3 db, but the power adjustment step size represented by UL _ SIR _ TARGET in the invention needs to be larger than 0 db.
Or, the existing protocol may not be modified, and only the value of UL _ SIR _ TARGET needs to be additionally specified, for example, if UL _ SIR _ TARGET is 0, the frame carries a data enhanced power control indication sent by the RLC layer to the physical layer.
Similarly, the RLC layer and the physical layer at the terminal side may also carry the data enhanced power control indication through the downlink outer loop power control frame according to the method.
On the network side, the RLC layer may also send a data enhanced power control indication to the physical layer through an interface between the RNC and the Node B (IUB) control protocol.
On the terminal side, the RLC layer may also send a data enhanced power control indication to the physical layer via the RRC control protocol.
The invention can be applied to TD-SCDMA system, and also can be applied to other mobile communication systems.
Referring to fig. 3, an embodiment of the present invention further provides a wireless communication system, where the system includes:
the network side device 30 is configured to determine whether to demodulate a TPC command word sent by the terminal in the current subframe or whether the quality of a signal sent by the terminal is lower than a preset quality threshold; if so, increasing the signal transmission power of the terminal, and transmitting data to the terminal in the current subframe by using the increased power; here, the network side device includes an RNC and a base station, or the network side device is a base station.
And the terminal 31 is used for receiving data sent by the network side equipment.
Still referring to fig. 3, an embodiment of the present invention further provides a wireless communication system, including:
a terminal 31, configured to determine whether a transmission power control TPC command word sent by a network side device is demodulated in a current subframe or whether quality of a signal sent by the network side device is lower than a preset quality threshold; if so, increasing the signal transmission power of the network side equipment, and transmitting data to the network side equipment in the current subframe by using the increased power;
a network side device 30, configured to receive data sent by a terminal; the network side device here may be a base station.
Referring to fig. 4, an embodiment of the present invention further provides a power control apparatus, including:
a determining unit 40, configured to determine whether a transmission power control TPC command word sent by the data receiving end is not demodulated in the current subframe or whether the quality of a signal sent by the data receiving end is lower than a preset quality threshold;
and a transmitting unit 41, configured to, when the determination is yes, increase the signal transmission power for the data receiving end, and transmit data to the data receiving end in the current subframe using the increased power.
The apparatus further comprises:
a determining unit 42, located in the RLC layer, configured to determine whether data that needs to be sent currently is retransmission data or a Reset command; if so, sending a data enhancement power control instruction to the physical layer;
the determining unit 40 located at the physical layer is configured to:
after receiving the data enhancement power control instruction, determining whether a TPC command word sent by a data receiving end is not demodulated in the current subframe or whether the quality of a signal sent by the data receiving end is lower than a preset quality threshold;
the sending unit 41 located in the physical layer is configured to:
and when the determining unit determines that the subframe is the subframe, increasing the signal transmission power of the data receiving end, and transmitting data to the data receiving end at the current subframe by using the increased power.
The determination unit 42 is configured to:
if the feedback information of the data receiving end aiming at the PDU is not received in a set time period after the PDU carrying the data is sent to the data receiving end, the PDU needing to be retransmitted and the data needing to be sent currently are determined to be retransmitted data.
The determination unit 42 is configured to:
and if the number of times of retransmitting the PDU to the data receiving end reaches the preset maximum retransmission number or the feedback information of the data receiving end aiming at the Reset instruction is not received in the set time period after the Reset instruction is sent to the data receiving end, determining that the data which needs to be sent currently is the Reset instruction.
The determining unit 40 and the sending unit 41 execute corresponding operations on each subframe of N subframes after receiving the data enhanced power control instruction, where N is an integer not less than 1.
The data which needs to be sent currently is signaling data or service data.
The determination unit 42 is configured to:
and sending a data enhancement power control instruction to a physical layer by adopting a frame protocol FP or an IUB control protocol or a radio resource control RRC protocol.
The apparatus also includes;
a command word unit 43, configured to send a TPC command word to the data receiving end after sending data in the current subframe using a second transmission power that is greater than the first transmission power, to instruct the data receiving end to increase the signal transmission power.
In conclusion, the beneficial effects of the invention include:
in the scheme provided by the embodiment of the invention, when the data sending end does not demodulate the TPC command word sent by the data receiving end in the current subframe or the quality of the signal sent by the data receiving end is lower than the preset quality threshold, the data sending end increases the signal sending power of the data receiving end, and sends data to the data receiving end in the current subframe by using the increased power.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (19)
1. A method of power control, the method comprising:
the data sending end determines whether the transmission power control TPC command word sent by the data receiving end is not demodulated in the current subframe or whether the quality of the signal sent by the data receiving end is lower than a preset quality threshold or not;
and when the data sending end determines that the subframe is the subframe, the data sending end increases the signal sending power of the data receiving end, and sends data to the data receiving end in the current subframe by using the increased power.
2. The method of claim 1, wherein before the data transmitting end determines whether the TPC command word transmitted by the data receiving end is not demodulated in the current subframe or whether the quality of the signal transmitted by the data receiving end is lower than a predetermined quality threshold, the method further comprises:
a Radio Link Control (RLC) layer of a data sending end determines whether data needing to be sent currently is retransmission data or a Reset command; if so, sending a data enhancement power control instruction to the physical layer;
the data sending end determines whether a TPC command word sent by a data receiving end is not demodulated in the current subframe or whether the quality of a signal sent by the data receiving end is lower than a preset quality threshold, and if so, determines the first sending power used for sending data in the current subframe at the latest time; transmitting data in the current subframe using a second transmission power greater than the first transmission power includes:
after receiving a data enhancement power control instruction sent by an RLC layer, a physical layer of a data sending end determines whether a TPC command word sent by a data receiving end is not demodulated in a current subframe or whether the quality of a signal sent by the data receiving end is lower than a preset quality threshold; and if so, increasing the signal transmission power of the data receiving end, and transmitting data to the data receiving end in the current subframe by using the increased power.
3. The method of claim 2, wherein the RLC layer of the data transmitting end determining whether the data currently required to be transmitted is retransmission data comprises:
if the RLC layer of the data sending end does not receive the feedback information of the data receiving end aiming at the PDU within a set time period after the RLC layer sends the protocol data unit PDU carrying the data to the data receiving end, the PDU needing to be retransmitted and the data needing to be sent currently are determined to be retransmitted data.
4. The method of claim 2, wherein the RLC layer of the data transmitting end determining whether the data currently required to be transmitted is a Reset command comprises:
and if the number of times that the RLC layer of the data sending end retransmits the PDU to the data receiving end reaches the preset maximum retransmission number or the feedback information of the data receiving end aiming at the Reset instruction is not received in the set time period after the Reset instruction is sent to the data receiving end, determining that the data needing to be sent at present is the Reset instruction.
5. The method of claim 2, wherein after receiving the data enhanced power control indication sent by the RLC layer, the physical layer at the data sending end performs the following operations for each of the next N subframes:
determining whether the TPC command word sent by a data receiving end is not demodulated in the current subframe or whether the quality of a signal sent by the data receiving end is lower than a preset quality threshold or not; and if so, increasing the signal transmission power of the data receiving end, and transmitting data to the data receiving end in the current subframe by using the increased power, wherein N is an integer not less than 1.
6. The method of claim 2, wherein the data currently required to be transmitted is signaling data or traffic data.
7. The method according to any of claims 2-6, wherein the RLC layer uses frame protocol FP or IUB control protocol or RRC protocol between radio network controller and base station to send data enhancement power control indication to the physical layer.
8. The method of any one of claims 1 to 6, wherein after the data transmitting end determines whether the TPC command word transmitted by the data receiving end is not demodulated in the current subframe or whether the quality of the signal transmitted by the data receiving end is lower than a preset quality threshold, the method further comprises:
the data transmitting end transmits TPC command words to the data receiving end to indicate the data receiving end to improve signal transmitting power.
9. The method according to any of claims 1-6, characterized in that the data sending end comprises a radio network controller, RNC, and a base station, and the data receiving end is a terminal; or,
the data sending end is a base station, and the data receiving end is a terminal; or,
the data transmitting end is a terminal, and the data receiving end is a base station.
10. A power control apparatus, characterized in that the apparatus comprises:
a determining unit, configured to determine whether a transmission power control TPC command word sent by a data receiving end is not demodulated in a current subframe or whether quality of a signal sent by the data receiving end is lower than a preset quality threshold;
and the sending unit is used for increasing the signal sending power of the data receiving end when the determination result is yes, and sending data to the data receiving end in the current subframe by using the increased power.
11. The apparatus of claim 10, further comprising:
the judging unit is positioned on an RLC layer and used for determining whether the data needing to be sent currently is retransmission data or a Reset command; if so, sending a data enhancement power control instruction to the physical layer;
the determining unit at the physical layer is configured to:
after receiving the data enhancement power control instruction, determining whether a TPC command word sent by a data receiving end is not demodulated in the current subframe or whether the quality of a signal sent by the data receiving end is lower than a preset quality threshold;
the transmitting unit at the physical layer is configured to:
and when the determining unit determines that the subframe is the subframe, increasing the signal transmission power of the data receiving end, and transmitting data to the data receiving end at the current subframe by using the increased power.
12. The device of claim 11, wherein the determination unit is to:
if the feedback information of the data receiving end aiming at the PDU is not received in a set time period after the PDU carrying the data is sent to the data receiving end, the PDU needing to be retransmitted and the data needing to be sent currently are determined to be retransmitted data.
13. The device of claim 11, wherein the determination unit is to:
and if the number of times of retransmitting the PDU to the data receiving end reaches the preset maximum retransmission number or the feedback information of the data receiving end aiming at the Reset instruction is not received in the set time period after the Reset instruction is sent to the data receiving end, determining that the data which needs to be sent currently is the Reset instruction.
14. The apparatus of claim 11, wherein the determining unit and the sending unit perform corresponding operations for each of N subframes after receiving the data enhanced power control indication, where N is an integer not less than 1.
15. The apparatus of claim 11, wherein the data currently required to be transmitted is signaling data or traffic data.
16. The apparatus of any of claims 11-15, the decision unit to:
and sending a data enhancement power control instruction to a physical layer by adopting a frame protocol FP or an IUB control protocol or a radio resource control RRC protocol.
17. The apparatus of any one of claims 10-15, further comprising;
and the command word unit is used for sending the TPC command word to the data receiving end after determining whether the TPC command word sent by the data receiving end is not demodulated in the current subframe or whether the quality of the signal sent by the data receiving end is lower than a preset quality threshold or not so as to indicate the data receiving end to improve the signal transmitting power.
18. A wireless communication system, comprising:
the network side equipment is used for determining whether the transmission power control TPC command word sent by the terminal is demodulated in the current subframe or whether the quality of the signal sent by the terminal is lower than a preset quality threshold or not; if so, increasing the signal transmission power of the terminal, and transmitting data to the terminal in the current subframe by using the increased power;
and the terminal is used for receiving the data sent by the network side equipment.
19. A wireless communication system, comprising:
the terminal is used for determining whether the transmission power control TPC command word sent by the network side equipment is demodulated in the current subframe or not or whether the quality of the signal sent by the network side equipment is lower than a preset quality threshold or not; if so, increasing the signal transmission power of the network side equipment, and transmitting data to the network side equipment in the current subframe by using the increased power;
and the network side equipment is used for receiving the data sent by the terminal.
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| CN201110134897A CN102325362A (en) | 2011-05-23 | 2011-05-23 | Power control method, system and equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110134897A CN102325362A (en) | 2011-05-23 | 2011-05-23 | Power control method, system and equipment |
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| CN102325362A true CN102325362A (en) | 2012-01-18 |
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