WO2013091568A1 - Procédé et dispositif d'émission de données - Google Patents

Procédé et dispositif d'émission de données Download PDF

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Publication number
WO2013091568A1
WO2013091568A1 PCT/CN2012/087145 CN2012087145W WO2013091568A1 WO 2013091568 A1 WO2013091568 A1 WO 2013091568A1 CN 2012087145 W CN2012087145 W CN 2012087145W WO 2013091568 A1 WO2013091568 A1 WO 2013091568A1
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Prior art keywords
cqi
base station
current
sinr
transmit power
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PCT/CN2012/087145
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English (en)
Chinese (zh)
Inventor
余成文
鱼洋
黄逸
许杰
邱玲
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华为技术有限公司
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Publication of WO2013091568A1 publication Critical patent/WO2013091568A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo

Definitions

  • the present invention relates to wireless communication technologies, and in particular, to a data transmission method and apparatus.
  • BACKGROUND OF THE INVENTION With the development of wireless communication technologies, meeting both high transmission rates and low power consumption has become an important challenge for future mobile communication technologies. According to Moore's Law, the communication rate of cellular networks is increasing by nearly 10 times every five years, while at the same time, the energy consumption of cellular networks is increasing at a rate of two times every five years. Therefore, under this trend, it is very important to reduce the energy consumption of wireless communication networks.
  • Energy Efficiency is the primary measure of the efficiency of a system's energy utilization. It represents the number of bits per energy consumed per joule. Maximizing energy efficiency is equivalent to maximizing the number of bits per joule of energy transfer.
  • energy efficiency user time transmission rate / (transmission power + line power)
  • the system transfer rate enhances the user experience.
  • the HSDPA system improves the downlink peak transmission rate and the system average throughput rate by using adaptive modulation coding (AMC), hybrid automatic retransmission (HQQ), fast scheduling, multiple input multiple output (MIMO), and multi-carrier technologies.
  • AMC adaptive modulation coding
  • HQQ hybrid automatic retransmission
  • MIMO multiple input multiple output
  • multi-carrier technologies e.g., multi-carrier technologies.
  • the modulation coding level is mainly selected. This is achieved by maximizing the transmission rate while guaranteeing a certain bit error rate.
  • MCS modulation coding level
  • the transmission power increases exponentially as the transmission rate increases, that is, when the transmission rate is large, an increase in the transmission rate leads to a larger transmission power.
  • the transmission rate is small, the transmission power is also small, and the presence of line power has a large influence on energy efficiency. Therefore, the compromise between line power and transmit power will largely affect the amount of energy efficiency.
  • CQI channel quality indicator
  • link adaptation of a wireless communication system generally allocates power according to a maximum spectral efficiency criterion, resulting in a decrease in energy efficiency and a dramatic increase in power consumption.
  • link adaptation in the HSDPA system is often performed according to the criterion of maximizing spectral efficiency.
  • the base station allocates power according to the criterion
  • the user equipment feeds back CQI and ACK/NACK according to the channel measurement and decoding, and the base station adjusts the MCS according to the feedback situation. , to achieve HSDPA data transmission.
  • the transmission power of the HS-PDSCH is determined by the base station. In order to maximize spectral efficiency, the base station tends to transmit the HS-PDSCH with the largest possible transmission power. At the same time, HS-PDSCH uses AMC and HARQ technologies and does not support fast power control.
  • the measured power offset MPO is used to inform the user of the power deviation between the HS-PDSCH and the CPICH.
  • the user can measure the CPICH, estimate the CQI according to the MPO, and then pass the uplink HS-DPCCH periodic feedback.
  • the base station selects an appropriate transmission format for the user according to the CQI fed back by the user, and uses the HS-PDSCH to transmit data to the user.
  • the user performs channel estimation based on the CPICH, and estimates the power of the HS-PDSCH based on the value of the MPO, and demodulates the received data.
  • Embodiments of the present invention provide a data transmission method and apparatus, which improve energy efficiency of wireless communication. Rate.
  • An aspect of the present invention provides a data transmission method, including:
  • the respective energy effabilities of the base station when using the respective CQIs and corresponding transmit powers are obtained;
  • the transmit power is configured as the transmit power corresponding to the largest EE in the EE, and the CQI corresponding to the largest EE in the EE is selected to transmit data to the user equipment.
  • a data transmission apparatus including:
  • a channel quality receiving unit configured to acquire a current channel quality indicator CQI fed back by the user equipment, and a determining unit, configured to determine a transport block size corresponding to the current CQI and a minimum signal to interference plus noise ratio SINR threshold; and a power obtaining unit, configured to: Obtaining, according to the current CQI, the lowest SINR threshold that is found by the first searching unit, and the current transmit power of the base station, the transmit power corresponding to the other CQIs supported by the base station;
  • a searching unit configured to search for a transport block size corresponding to the other CQIs
  • An energy efficiency obtaining unit configured to use a transmission block size and a transmission power corresponding to each CQI searched by the searching unit, to obtain respective energy effabilities of the base station when using the respective CQIs and corresponding transmission powers;
  • a transmission unit configured to configure the transmission power to be the transmission power corresponding to the largest EE in the EE, and select the CQI corresponding to the largest EE in the EE to send data to the user equipment.
  • the data transmission method and apparatus determine the reconfigured transmission power and the corresponding CQI by obtaining optimal energy efficiency, and send the transmission condition if the trigger condition is met.
  • the power is configured to re-determine the transmission power, and the corresponding CQI corresponding transmission format is selected, which improves the energy efficiency of the wireless communication system and reduces the energy consumption.
  • FIG. 1 is a flowchart of a data transmission method according to an embodiment of the present invention
  • FIG. 2 is a flowchart of another data transmission method according to an embodiment of the present invention.
  • Figure 3 is a graph showing the effect of user speed on energy efficiency through HSDPA link-level simulation.
  • Figure 4 is a simulation analysis of the performance of the power-efficient strategy with optimal energy efficiency at different user distances.
  • Figure 5 Guaranteed bit rate for user-supplied shares A simulation analysis diagram of the performance of the energy efficiency optimal power control strategy under the restriction;
  • FIG. 6 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present invention.
  • FIG. 1 is a flowchart of a data transmission method according to an embodiment of the present invention.
  • the wireless communication system may be an HSDPA system, an LTE system, or the like, and the configuration method is an operation on the base station side.
  • the data transmission method includes: Step 11: Acquire a current channel quality indicator CQI fed back by the user equipment.
  • Step 12 Determine a transport block size corresponding to the current CQI and a minimum signal to interference plus noise ratio SINR threshold.
  • Step 13 Obtain transmit power corresponding to other CQIs supported by the base station according to the current CQI, the minimum SINR threshold, and the current transmit power of the base station. For example, the sum of the current transmit power P and the SINR corresponding to the current CQI may be used, and the SINR corresponding to the other CQI may be subtracted to obtain the transmit power corresponding to the other CQI, which may be specifically:
  • the minimum SINR threshold, SINR, corresponding to the CQI is the lowest SINR threshold corresponding to the current CQI.
  • Step 14 Find a transport block size corresponding to the other CQIs.
  • the CQI corresponding transport block size can be determined by looking up the CQI and transport format mapping table.
  • Step 15 Using the transport block size and the transmit power corresponding to each CQI, obtain the respective energy efficiency EE of the base station when using the respective CQIs and corresponding transmit powers.
  • EEj is the energy efficiency when the base station uses the jth CQI and Pj
  • TBsize CQI . is the transport block size corresponding to the jth CQI
  • TTI is the transmission time interval
  • ⁇ " is the jth CQI Corresponding transmission power
  • P OT is line power.
  • Step 16 Configure the transmit power to be the transmit power corresponding to the largest EE in the EE, and select the CQI corresponding to the largest EE in the EE to send data to the user equipment.
  • the reconfigured transmit power and the corresponding CQI are determined by obtaining the optimal energy efficiency, and the transmit power is configured as the re-determined transmit power, and the corresponding CQI corresponding transport format is selected.
  • the semi-static power control and CQI selection of the wireless communication system are implemented according to the energy efficiency optimal criterion, which improves the energy efficiency of the wireless communication system and reduces the energy consumption.
  • the data transmission method provided by the embodiment of the present invention may further include:
  • the method further includes: A mode used when transmitting a packet next time is determined according to the current CQI and ACK or NACK.
  • the transmit power corresponding to the other CQIs supported by the base station is obtained, including:
  • TTI - (P J + P cir ) is calculated, where TBsize is the transport block size corresponding to the jth CQI of the first stream, and TB S i Z e CQ1 ⁇ 2k+ji) is corresponding to the jth CQI of the first stream.
  • the transport block size corresponding to the k+th CQI of the second stream k is the sequence number of the CQI of the second stream corresponding to the current CQI of the first stream, and i is the sequence number of the current CQI of the first stream
  • the method further includes: using a formula
  • Configuring the transmit power to be the transmit power corresponding to the largest EE in the EE includes: when the EEDR reaches the trigger threshold, and the current time reaches the minimum trigger time threshold from the time when the last configured transmit power is reached, the transmit power is configured as The transmission power corresponding to the largest EE in the EE.
  • the transmission power is configured as the transmission power corresponding to the largest EE in the EE.
  • FIG. 2 is a flowchart of another data transmission method according to an embodiment of the present invention.
  • the wireless communication system is an HSDPA system.
  • the user equipment feeds back CQI and ACK/NACK to the base station according to the measured channel condition and the decoding situation.
  • the base station performs power configuration, and specifically includes: Step 21: The base station receives the CQI and the ACK/NACK fed back by the user equipment, and the base station selects and estimates the energy-optimized CQI and the transmit power. Specifically, the base station estimates the current energy efficiency EE mi according to the CQI and ACK/NACK fed back by the user equipment, where EE im is the energy efficiency of the base station at the current transmit power and the current CQI fed back by the user.
  • the base station estimates the transmission power and the energy efficiency value corresponding to the different CQIs according to the correspondence between the HS-PDSCH channel reception signal to noise ratio threshold and the different CQIs (ie, the MCS table) under the 10% initial error block rate limit.
  • the base station determines the transmit power P corresponding to the maximum energy efficiency by comparing the estimated energy efficiency values.
  • Pt and corresponding CQI CQI. Pt .
  • Equation (1) Calculate the relative energy efficiency difference ratio (EEDR):
  • Step 23 Determine whether the trigger condition of the power configuration is met. If yes, execute step 24. Otherwise, perform step 25, wherein the trigger condition may have three: one is the minimum relative EEDR of the trigger power control, that is, the trigger threshold ⁇ ; Minimum trigger time. Hlblt , the minimum time between two power configurations Interval; there is also a maximum non-trigger time pOT . d , the maximum interval between two power configurations.
  • Step 24 The base station configures the optimal sending power to be P fm , and sends data to the user according to the corresponding transmission format of the CQI fm , and simultaneously informs the user equipment by using the MPO signaling of the Radio Resource Control (RRC) layer. The power changes, the timer is cleared at the same time, and the cycle is performed.
  • RRC Radio Resource Control
  • Step 25 The base station does not change the transmission power, and sends data according to the CQI fed back by the user equipment.
  • the HSDPA system base station determines the reconfigured transmit power and the corresponding CQI by obtaining the optimal energy efficiency, and configures the transmit power to the re-determined transmit power and selects the corresponding CQI correspondingly when the trigger condition is met.
  • the transmission format realizes semi-static power control and CQI selection of HSDPA according to the energy efficiency optimal criterion. The following describes the method for configuring the power of the base station in the HSDPA system by using the first embodiment and the second embodiment.
  • Embodiment 1 In this embodiment, a single antenna is configured at the base station.
  • the base station and the user equipment respectively have an MCS table, that is, between the HS-PDSCH channel reception signal-to-noise ratio threshold and the different CQI under the 10% initial error block rate limit.
  • the initial error block rate may also be another preset value, which is not limited by the present invention.
  • the user equipment feeds back CQI and ACK/NACK to the base station according to the measured channel conditions and the decoded condition.
  • the process of configuring power by the base station includes: In the first step, the base station calculates, according to the CQI and the ACK/NACK fed back by the user equipment, the energy efficiency when selecting different transmission powers and CQI data transmission to the user, and comparing and selecting the CQI and the transmission with the optimal energy efficiency. Power, the maximum transmit power of the base station is limited to P max .
  • the base station uses the MCS table to give HS-PDSCH under the 10% initial error block rate limit.
  • the channel receives the signal-to-noise ratio threshold and the correspondence between different CQIs, and estimates the transmission power required by the base station to transmit data to the user according to different CQIs.
  • the user equipment selects the lowest SINR of the i-th CQI CQI and the j-th CQI (CQIj).
  • the thresholds are SIN3 ⁇ 4 and SI R, respectively, and the estimated value of the transmission power Pj corresponding to the base station transmitting CQI is as shown in the formula (2), and the current transmission power P is added with the deviation between SINRj and SINR:
  • the base station cannot transmit data using the transmission format corresponding to the jth CQI.
  • the base station calculates, according to the formula (2), all of the supported CQIs, that is, the transmission powers corresponding to all CQIs in the MCS table.
  • the base station determines the transport block size corresponding to CQIj according to the CQI and the transport format mapping table.
  • TTI is the transmission time interval and P OT is the line power.
  • the energy efficiency under different CQIs and transmission powers that can be used by the base station is calculated using equation (3). Then, the energy efficiency with the largest value is selected from the calculated energy efficiency, and the CQI corresponding to the energy efficiency with the largest value is defined as CQI. Pt , the corresponding transmit power is defined as P. Pt .
  • GRR Guaranteed Bit Rate
  • CQI mm is defined as the minimum CQI corresponding to the transport block size TBSize that satisfies the following conditions:
  • TBSize ⁇ r-TTI is based on the minimum transmit power constraint corresponding to the above formula (2) is p mm . Then, satisfy The optimal CQI fm for the user to guarantee the bit rate limit can be based on the above CQI. Pt and CQI mm get:
  • TTI-(P fm +P cir ) where 18 5 ⁇ (3 ⁇ 41 ⁇ 21) is ((3 ⁇ 4 111 corresponds to the transport block size, P OT is the line power (
  • EE mi is the energy efficiency corresponding to the current CQI fed back by the user equipment.
  • the power configuration signaling is prevented from being too frequent and the overhead is too large, and the base station determines whether the condition for triggering the configured power is met.
  • the HSPDA system is configured with a trigger threshold ⁇ , which is the minimum relative EEDR of the trigger power control.
  • the HSPDA system is also configured with a minimum trigger time threshold prahlblt and a maximum non-trigger time threshold pOT . d .
  • the base station side is provided with a minimum trigger timer t prahlblt , which starts automatic timing after each configuration of the transmission power.
  • the base station side is also provided with a maximum non-trigger timer t pOT . d , also automatically counts each time after configuring the transmit power.
  • the trigger conditions are as follows:
  • Condition 1 The relative EEDR calculated in the first step above is greater than or equal to the trigger threshold ⁇ ; Condition 2. t prohibit ⁇ 011 , Condition 3: t penod ⁇ lod , ie at pOT .
  • the base station After no energy efficiency re-matching is performed in d time, the base station will perform power reconfiguration when the next transmission format is selected. The base station makes a judgment on Condition 1, Condition 2, and Condition 3. If both Condition 1 and Condition 2 are satisfied, Or only condition 3 is satisfied, then the third step is executed to trigger the power reconfiguration and CQI redistribution mechanism; otherwise, the fourth step is executed, and the mechanism is not triggered.
  • the base station triggers the power reconfiguration and the CQI redistribution mechanism, reconfigures the transmit power to P fm , and selects the CQI with the best energy efficiency, that is, CQI fm, to send data to the user, and at the same time, the timer in the second step. Cleared to zero, restart timing.
  • the base station informs the user equipment of the change of the transmission power through the MPO of the Radio Resource Control (RRC) signaling.
  • RRC Radio Resource Control
  • the base station does not trigger the power reconfiguration and the CQI redistribution mechanism, does not change the transmission power, and transmits data according to the CQI fed back by the user in the first step under the current transmission power.
  • Embodiment 2 In this embodiment, two antennas are respectively configured on the base station end and the user end.
  • the base station and the user equipment respectively have MCS tables, that is, the correspondence between the HS-PDSCH channel reception signal-to-noise ratio threshold and different CQIs under the 10% initial error block rate limit.
  • MCS tables that is, the correspondence between the HS-PDSCH channel reception signal-to-noise ratio threshold and different CQIs under the 10% initial error block rate limit.
  • CQI S is the CQI that should be fed back when using the single-stream mode
  • C (3 ⁇ 4 is the CQI of the first stream when the dual-stream mode is used
  • CQI of the second stream when the dual-stream mode is used is used.
  • the user equipment After selecting the corresponding mode, the user equipment feeds back the corresponding CQI and the ACK/NACK indicating whether the previous packet was successfully sent or not.
  • the base station side performs the energy-efficient semi-static power configuration, which specifically includes:
  • the base station calculates, according to the CQI and the ACK/NACK fed back by the user equipment, whether to use the single stream mode or the dual stream mode when sending the next packet, and obtain the corresponding CQI.
  • the base station calculates the energy efficiency when selecting different transmission powers and CQIs to perform data transmission to the user according to the CQI and ACK/NACK fed back by the user equipment, and compares the CQI and the transmission power that are optimal in energy efficiency, and the maximum transmission power of the base station. Limited to P max .
  • the optimal power and CQI that satisfy the user guaranteed bit rate limit are denoted as P fm and CQI sfm , and the corresponding optimal Energy efficiency EE fm :
  • the method includes: the base station uses the correspondence between the received signal-to-noise ratio threshold of the HS-PDSCH channel and the different CQI under the 10% initial error block rate limit represented by the MCS table, and estimates the same time.
  • the two streams of the base station transmit power required for transmitting data to the user according to a transmission format corresponding to different CQIs, and it is known that the transmission powers of the two streams are equal.
  • the base station changes the transmission format of the first stream to the jth C (3 ⁇ 4, denoted as CQI U.
  • the corresponding transmit power also needs to be adjusted; since the two streams transmit the same power, therefore, the second stream
  • the transmission power and transmission format also need to be adjusted accordingly, and the adjusted transmission format of the second stream is adjusted to the first CQI, denoted as CQI 2 , and should satisfy the difference of the SINR threshold corresponding to the CQI changes of the two streams.
  • the values are the same:
  • SINR, - S earn t SINR - SINR
  • the CQI value corresponding to the second stream can be obtained by checking the MCS table. And, according to the MCS table, the lowest SINR thresholds that the user equipment selects to feed back the i-th CQI and the j-th CQI are SINR, and SINRj, respectively. Then, the base station calculates CQI, and CQI 2 , and the corresponding transmission power when transmitting data in the corresponding transmission format as follows:
  • the base station cannot use CQIu and CQI 2 to transmit data.
  • the base station combines the required transmit power according to all available different CQIs and CQI 2 , and determines CQI, j and CQI 2 according to the CQI and transport format mapping table, corresponding transport block sizes TBsize CQIij and TBsize CQl2i , and then Calculate the energy efficiency ⁇ when the base station is used (CQI ⁇ CQI ⁇ and the transmission power Pj) as follows:
  • EEDR where EE mi is the current energy efficiency, ie the energy efficiency of the base station at the current transmit power P and the current feedback (CQI H , CQI 2k ) of the user feedback, obtained by the following formula (13):
  • the third step is similar to the second step of the first embodiment, in order to achieve the purpose of performing energy efficiency optimal power control semi-statically, preventing the power configuration signaling from being too frequent, the overhead is too large, and the base station determines whether the trigger is satisfied.
  • the condition for configuring power is similar to the second step of the first embodiment, in order to achieve the purpose of performing energy efficiency optimal power control semi-statically, preventing the power configuration signaling from being too frequent, the overhead is too large, and the base station determines whether the trigger is satisfied. The condition for configuring power.
  • the HSPDA system is configured with a trigger threshold ⁇ , which is the minimum relative EEDR of the trigger power control.
  • the HSPDA system is also configured with a minimum trigger time threshold prahlblt and a maximum non-trigger time threshold pOT . d .
  • the base station side is provided with a minimum trigger timer t prahlblt , which starts automatic timing after each configuration of the transmission power.
  • the base station side is also provided with a maximum non-trigger timer t pOT . d , also automatically counts each time after configuring the transmit power.
  • the trigger conditions are as follows: Condition 1: The relative EEDR calculated in the first step above is greater than or equal to the trigger threshold ⁇ ; Condition 2. t prohibit ⁇ 011 , Condition 3: t penod ⁇ lod , ie at pOT .
  • the base station After no energy efficiency re-matching is performed in d time, the base station will perform power reconfiguration when the next transmission format is selected.
  • the base station makes a judgment on the condition 1, the condition 2, and the condition 3. If the condition 1 and the condition 2 are satisfied at the same time, or only the condition 3 is satisfied, the fourth step is performed to trigger the power reconfiguration and the CQI redistribution mechanism; otherwise, the fifth is performed. Step, does not trigger the mechanism.
  • the base station triggers the power reconfiguration and the CQI redistribution mechanism, reconfigures the transmit power to P fm , and selects the CQI with the best energy efficiency to send data to the user, that is, in the MIMO single stream mode.
  • the base station informs the user equipment of the change of transmission power through the MPO of layer 3 signaling.
  • the base station does not trigger the power reconfiguration and the CQI re-distribution mechanism.
  • the base station does not change the transmission power, and sends data according to the CQI fed back by the user calculated according to the first step under the current transmission power P.
  • the base station uses the MIMO single stream, the data is transmitted according to the CQI S fed back by the user; if the base station uses the MIMO dual stream, the data is transmitted according to the user feedback (CQI H , CQI 2k ).
  • the UMTS HSDPA system base station estimates the energy efficiency of the base station using different CQIs for data transmission by using the MCS table, and selects the energy efficiency optimal transmission power and CQI for transmission, which not only reduces the power configuration complexity, but also is based on
  • the energy-efficient semi-static power configuration greatly increases the energy efficiency of the UMTS HSDPA system.
  • the triggering mechanism in the above embodiment not only has a small signaling overhead, but also obtains a significant energy efficiency gain.
  • the line corresponding to the PC policy represents the energy-efficient semi-static power configuration scheme in the UMTS HSDPA proposed by the present invention; as a comparison scheme, the line corresponding to the PC generally represents the energy efficiency optimal power configuration in each subframe (performance upper bound, In practice, it is impossible to implement, because this will affect the HARQ retransmission.
  • the line corresponding to the PC does not represent the traditional spectrum efficiency optimal link adaptation process, that is, no power reconfiguration is performed, and the transmission is performed at the maximum power. It can be seen from FIG. 3 that the energy-efficient semi-static power configuration scheme of the UMTS HSDPA proposed by the present invention can obtain significant energy efficiency gain with less power reconfiguration times and signaling overhead (by trigger threshold and trigger). As the user's moving speed energy efficiency gain decreases, the channel change becomes faster, and the energy-efficient optimal power configuration cannot fully match the channel change. Obvious performance gain can still be seen at 60 km/h.
  • Figure 4 analyzes the performance of the energy-efficient strategy with the best energy efficiency under different user distances.
  • the horizontal axis represents the distance between the user and the base station, and the user speed is 3km/h.
  • Figure 5 shows the user-guaranteed bit rate limit, that is, the performance of the energy-efficient optimal power control strategy under the minimum CQI limit is simulated.
  • the horizontal axis represents the user-guaranteed bit rate limit, and the user speed is 3 km/h.
  • the power configuration scheme proposed by the present invention can obtain a larger energy efficiency gain while ensuring the user minimum transmission rate limit (corresponding to the lowest CQI constraint).
  • the energy efficiency gain will decrease. This is because as the path loss increases, the optimal energy efficiency transmission power also increases.
  • the optimal energy efficiency transmission power When the user distance is large, the optimal energy efficiency transmission power will be the largest. The transmission power is limited, so the energy efficiency curve with the best energy efficiency will coincide with the reference curve (no power control). When the minimum CQI limit is very strict, the energy efficiency gain will decrease, and finally coincide with the spectrum efficiency optimal curve, where the optimal refers to the power control, and when there is no power control, the base station uses the maximum power. Send, the spectrum efficiency is optimal at this time.
  • the spectral efficiency optimal curve is the one-dot chain line in Figure 4. Compared to the traditional link adaptation scheme, the smaller the CQI constraint, the greater the energy efficiency gain.
  • FIG. 6 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present invention.
  • the data transmission apparatus in this embodiment is used to implement the method in the embodiment shown in FIG. 1, and may be a base station, a base station controller, and an eNodeB of LTE in 2G and 3G technologies.
  • the data transmission apparatus includes: a channel quality receiving unit 61, a determining unit 62, a power obtaining unit 63, a searching unit 64, an energy efficiency obtaining unit 65, and a transmitting unit 66.
  • the channel quality receiving unit 61 is configured to receive a current channel quality indicator fed back by the user equipment.
  • the determining unit 62 is configured to determine a transport block size and a minimum signal to interference plus noise ratio SINR threshold corresponding to the current CQI.
  • the power obtaining unit 63 is configured to obtain, according to the current CQI, the minimum SINR threshold, and the current transmit power of the base station, the transmit power corresponding to the other CQIs supported by the base station.
  • the power obtaining unit 63 can be specifically used to utilize the formula:
  • Pj P + SINRj - SINR, calculating the transmission power corresponding to other CQIs supported by the base station, where Pj is The transmit power corresponding to the jth CQI supported by the base station, P is the current transmit power, SINRj is the lowest SINR threshold corresponding to the jth CQI supported by the base station, and the SINR is the lowest SINR threshold corresponding to the current CQI.
  • the searching unit 64 is configured to find a transport block size corresponding to the other CQIs.
  • the energy efficiency obtaining unit 65 is configured to use the transport block size and the transmit power corresponding to each CQI to obtain respective energy efficiencies when the base station uses the respective CQIs and corresponding transmit powers.
  • the transmitting unit 66 is configured to configure the transmit power as the transmit power corresponding to the largest EE in the EE, and select the CQI corresponding to the largest EE in the EE to send data to the user equipment.
  • the data transmission apparatus provided by the embodiment of the present invention may further include: a response receiving unit and a mode determining unit.
  • the response receiving unit is configured to receive a response ACK or a command error response NACK that is sent by the user equipment to indicate whether the last packet was successfully sent.
  • the mode determining unit is configured to determine, at the determining unit 62, the lowest signal and interference corresponding to the current CQI. Before adding the noise ratio SINR threshold and the transport block size, it is used to determine the mode used when the packet is transmitted next according to the current CQI and ACK or NACK.
  • the power obtaining unit 63 may be specifically configured to use a formula when the determined mode is a dual stream mode:
  • Pj P + 2x(SINR J - SINR,) Calculating the transmission power corresponding to other CQIs supported by the base station, where Pj is when the CQI of the first stream is the jth CQI supported by the base station
  • the transmit power P is the current transmit power
  • SINRj is the lowest SINR threshold corresponding to the jth CQI supported by the base station
  • the SINR is the lowest SINR threshold corresponding to the current CQI.
  • the energy efficiency obtaining unit 65 when the determined mode is the dual stream mode, the EE passes the formula:
  • TTI-(P J + P cir ) is calculated, where TBsize is the transport block size corresponding to the jth CQI of the first stream, and TB S i zea is the second stream corresponding to the jth CQI of the first stream.
  • the transport block size corresponding to the first CQI k is the sequence number of the CQI of the second stream corresponding to the current CQI of the first stream, i is the sequence number of the current CQI of the first stream, and TTI is the transmission time interval, ⁇
  • the data transmission apparatus may further include: an energy efficiency difference ratio obtaining unit, configured to obtain, by the energy efficiency obtaining unit 65, respective energy efficiencies when the base station uses the respective CQIs and corresponding transmission powers After EE, used to use formula
  • the transmitting unit 66 is configured to when the EEDR reaches the trigger threshold, and currently When the time from the last configuration of the transmission power reaches the minimum trigger time threshold, the transmission power is configured as the transmission power corresponding to the largest EE in the EE.
  • the transmitting unit 66 is further configured to configure the transmit power to be the transmit power corresponding to the largest EE in the EE when the current time reaches the maximum trigger time threshold from the time when the last configured transmit power is reached.
  • the data transmission device determines the reconfigured transmission power and the corresponding CQI by using the energy efficiency obtaining unit to obtain the optimal energy efficiency, and configures the transmission power to be re-determined by the transmission unit under the trigger condition.
  • Power select the corresponding CQI corresponding transmission format to transmit data, realize semi-static power control and CQI selection of the wireless communication system according to the energy efficiency optimal criterion, improve the energy efficiency of the wireless communication system, and reduce the energy consumption.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un dispositif d'émission de données, le procédé comportant les étapes consistant à : acquérir une indication de qualité de canal (CQI) actuelle renvoyée par un équipement d'utilisateur (UE) ; déterminer la taille d'un bloc d'émission correspondant à la CQI actuelle et le seuil du plus faible rapport signal/brouillage plus bruit (SINR) ; en fonction de la CQI actuelle, du seuil du plus faible SINR et de la puissance actuelle d'émission d'une station de base, obtenir la puissance d'émission correspondant à d'autres CQI prises en charge par la station de base ; explorer les tailles des blocs d'émission correspondant à d'autres CQI ; utiliser la taille du bloc d'émission correspondant à chaque CQI et la puissance d'émission pour obtenir un rendement énergétique respectif (EE) lorsque la station de base emploie chaque CQI et la puissance d'émission correspondante ; configurer la puissance d'émission comme étant la puissance d'émission correspondant à l'EE le plus élevé et sélectionner la CQI correspondant à l'EE le plus élevé pour envoyer des données à l'UE. La présente invention détermine la puissance d'émission reconfigurée en obtenant l'EE optimal, améliorant ainsi l'EE d'un système de communications sans fil.
PCT/CN2012/087145 2011-12-21 2012-12-21 Procédé et dispositif d'émission de données WO2013091568A1 (fr)

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