WO2018077042A1 - 一种eMTC的下行功率控制方法及装置、基站 - Google Patents

一种eMTC的下行功率控制方法及装置、基站 Download PDF

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Publication number
WO2018077042A1
WO2018077042A1 PCT/CN2017/106005 CN2017106005W WO2018077042A1 WO 2018077042 A1 WO2018077042 A1 WO 2018077042A1 CN 2017106005 W CN2017106005 W CN 2017106005W WO 2018077042 A1 WO2018077042 A1 WO 2018077042A1
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downlink
power
emtc
task
lte
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PCT/CN2017/106005
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French (fr)
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周建
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上海中兴软件有限责任公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0289—Congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0473—Wireless resource allocation based on the type of the allocated resource the resource being transmission power
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows

Definitions

  • the present disclosure relates to the field of communications technologies, and in particular, to a downlink power control method and apparatus, and a base station of an eMTC.
  • MTC Machine Type Communication
  • LTE Physical Layer Enhancements for MTC (eMTC) is introduced in 3GPP Rel-13.
  • eMTC LTE Physical Layer Enhancements for MTC
  • the eMTC on the base station side is deployed in the LTE system, and the frequency domain occupies six physical resource blocks (physical resource blocks) in the LTE bandwidth.
  • the downlink coverage enhancement of the eMTC mainly comes from Resend.
  • Mode A For coverage enhancement, eMTC is divided into two modes: Mode A and Mode B.
  • Mode B a large number of repetitions (PDSCH (Physical Downlink Shared Channel) up to 2048 times) are required to ensure coverage and services.
  • PDSCH Physical Downlink Shared Channel
  • the problem in downlink scheduling is that if a conservative scheduling with a large number of repetitions is adopted, the UE access time is long, and when the conservative scheduling is not used, the rough estimation is performed.
  • the mode does not guarantee the correctness of the scheduling.
  • the MSG2 (message 2) with a certain probability cannot be correctly received by the UE, which also causes the random access delay to be large.
  • the technical problem to be solved by the present disclosure is to provide a method and a device for controlling the downlink power of the eMTC, and a base station, which is used to solve the problem that the number of PDSCH repetitions in the eMTC Mode B in the related art is large, the downlink scheduling is complicated, and the congestion is easy.
  • the present disclosure provides a method for controlling a downlink power of an eMTC, including: determining, according to an enhanced device type, a downlink resource pre-allocated for a current eMTC downlink task in an eMTC downlink power to be upgraded queue, and determining an to-be-raised transmission of the eMTC downlink task.
  • the power consumption is shared by the eMTC downlink task to the eMTC downlink task, where the downlink power headroom corresponding to the LTE downlink scheduling subframe is greater than or equal to the to-be-raised transmit power.
  • the transmit power is increased, and the corresponding added value is equal to the transmit power to be boosted.
  • the present disclosure further provides a downlink power control apparatus of an eMTC, including: a determining unit, setting Determining, according to the downlink resource pre-allocated for the current eMTC downlink task in the eMTC downlink power to be upgraded queue, the to-be-raised transmit power of the eMTC downlink task; the sharing unit, configured to determine, in the determining unit, the LTE downlink scheduling subframe When the corresponding downlink power margin is greater than or equal to the to-be-raised transmit power, the downlink power headroom is shared to the eMTC downlink task, so that the transmit power of the eMTC downlink task is increased, and the corresponding increase is performed. The value is equal to the transmit power to be boosted.
  • the present disclosure also provides a base station, including a downlink power control apparatus of any one of the eMTCs provided by the present disclosure.
  • the present disclosure also provides a storage medium configured to store a program code for performing a downlink power control method of the eMTC according to any of the above.
  • the method and device for controlling the downlink power of the eMTC provided by the embodiment of the present disclosure, and the base station, can share the downlink power margin to the case where the downlink power headroom corresponding to the LTE downlink scheduling subframe is greater than or equal to the to-be-raised transmit power
  • the eMTC downlink task is used to increase the transmit power of the eMTC downlink task, so that the LTE idle power resource is effectively utilized to implement the eMTC downlink power dynamic enhancement, and the number of PDSCH repetitions of the eMTC in the Mode B is correspondingly reduced. Access delay and downlink HARQ RTT, which effectively increases the flexibility of eMTC downlink scheduling.
  • FIG. 1 is a flowchart of a method for controlling downlink power of an eMTC according to an embodiment of the present disclosure
  • FIG. 2 is another flowchart of a downlink power control method of an eMTC according to an embodiment of the present disclosure
  • FIG. 3 is an overall flowchart of a downlink power control method of an eMTC according to an embodiment of the present disclosure
  • FIG 4 is a detailed flow chart of the control process of Figure 3;
  • FIG. 5 is a detailed flow chart of the control process of Figure 3.
  • Figure 6 is a detailed flow chart of the control process of Figure 3.
  • FIG. 7 is a schematic structural diagram of a downlink power control apparatus of an eMTC according to an embodiment of the present disclosure.
  • an embodiment of the present disclosure provides a downlink power control method of an eMTC, including:
  • the downlink power headroom corresponding to the LTE downlink scheduling subframe is greater than or equal to the to-be-raised transmit power, share the downlink power margin to the eMTC downlink task, so that the eMTC downlink task is The transmit power is increased, and the corresponding added value is equal to the transmit power to be boosted.
  • the downlink power control method of the eMTC can be configured in the LTE downlink scheduling subframe.
  • the downlink power headroom is greater than or equal to the to-be-raised transmit power
  • the downlink power headroom is shared to the eMTC downlink task, so that the transmit power of the eMTC downlink task is increased, thus effectively utilizing the LTE idle power resource.
  • the eMTC downlink power dynamic enhancement is implemented, and the number of PDSCH repetitions of the eMTC in the Mode B is reduced, and the access delay and the downlink HARQ RTT are reduced, thereby effectively increasing the flexibility of the eMTC downlink scheduling.
  • the eMTC downlink task to be sent can be pre-scheduled and placed in the downlink task queue, and can find whether there are MSG2, MSG4, retransmission or new to be assigned by the DCI in the mode B. If yes, create a corresponding Mode B downlink power to be upgraded queue, and place the corresponding eMTC downlink task into the created downlink power to be upgraded queue.
  • Each downlink task in the queue has the requirement to increase the transmit power. However, whether the corresponding downlink power upgrade and the specific upgrade can be achieved need to be analyzed according to the eMTC resource situation and the LTE resource situation.
  • determining the to-be-raised transmit power of the eMTC downlink task according to the downlink resource that is pre-allocated for the current eMTC downlink task in the eMTC downlink power to be upgraded queue may include:
  • the downlink power value that needs to be upgraded corresponding to the initial downlink power is the to-be-raised transmit power of the eMTC downlink task.
  • the current eMTC downlink task in the eMTC downlink power to be upgraded queue is pre-allocated with some transmission parameters, such as the initial downlink power, the initial repetition number, and the upper threshold of the downlink repetition number, etc., if the downlink task is performed according to these parameters.
  • Send, the transmit power is not adjusted.
  • the number of repetitions is related to the downlink power. To ensure the quality of the air interface transmission, if the number of repetitions is to be reduced, the downlink power needs to be increased accordingly. Therefore, the repetition can be limited by the upper threshold of the downlink repetition number.
  • the appropriate number of repetitions and the corresponding downlink power are selected to replace the parameters in the corresponding initial downlink task, so as to reduce the number of PDSCH repetitions to be transmitted.
  • each repetition set can be traversed in a predetermined order.
  • the upper limit of the number of downlink repetitions is 512
  • the determined repetition set includes 4, 16, 64, 128, 192, 256, 384, and 512, and traverses in order from the smallest to the largest.
  • the repetition set when the number of downlink repetitions changes from the initial repetition number to the repetition number in the repetition set, the downlink power value that the initial downlink power needs to be correspondingly raised is the to-be-raised transmission power of the eMTC downlink task.
  • the transmit power to be boosted of the eMTC downlink task can be determined according to the following formula:
  • ⁇ Psum is the transmit power to be boosted
  • ⁇ P is the transmit power to be boosted for each resource unit
  • R is the initial number of repetitions
  • ni is any repetition number in the repetition set
  • Prb is the physical resource block PRB pre-allocated by the current eMTC downlink task. number.
  • the minimum resource unit in LTE is an RE (resource element), and each PRB includes 12 REs.
  • ⁇ P corresponds to the relative power per RE, so it is necessary to add the dB value corresponding to the total number of REs allocated by the current eMTC downlink task (ie, the number of PRBs *12), which is calculated as the absolute power value.
  • the initial downlink power, the initial repetition number, and the upper threshold of the downlink repetition number are pre-allocated for the current eMTC downlink task in the eMTC downlink power to be upgraded queue. Then, before the repetition set determined by the upper limit threshold of the downlink repetition number is traversed according to the preset change order of the number of downlink repetitions, the following steps may be further included:
  • the repetition set determined by traversing the upper limit threshold of the downlink repetition number according to a preset change order of the number of downlink repetitions includes:
  • the upper limit of the downlink repeat is traversed according to a preset change order of the number of downlink repetitions. The set of repetitions determined by the threshold. If the relatively narrow-band transmit power RNTP high-power indication sent by the neighboring cell is received on the physical resource block corresponding to the initial time-frequency resource, the power boost is discarded.
  • the downlink power headroom corresponding to the LTE downlink scheduling subframe can meet the requirement of the to-be-raised transmit power. If the downlink power headroom corresponding to the LTE downlink scheduling subframe is greater than or equal to the to-be-raised transmit power, the downlink power headroom is shared to the eMTC downlink task, and the example may include the following steps:
  • LTE downlink power margin LTE downlink available power - LTE downlink GBR service reserved power - LTE downlink NGBR service reserved power - LTE cut-in reserved power;
  • the downlink power margin is shared to the eMTC downlink task.
  • the downlink power headroom corresponding to the LTE downlink scheduling subframe may be shared with the current eMTC downlink task.
  • the downlink power headroom of the LTE downlink scheduling subframe is 6 db, the number of repetitions can be increased, and the to-be-raised transmit power of the eMTC downlink task is reduced.
  • the to-be-raised transmit power of the eMTC downlink task is less than or equal to 6 db, the LTE downlink is performed.
  • the downlink power headroom corresponding to the scheduling subframe is shared with the current eMTC downlink task.
  • the downlink power headroom may be shared to the eMTC downlink task by using the following steps:
  • the resource parameters corresponding to the updated transmit power of the eMTC downlink task are synchronized to the downlink scheduling queue of the eMTC, and the corresponding downlink control information DCI is updated.
  • the transmit power of the eMTC downlink task is updated according to the following formula:
  • Pnew is the updated transmit power
  • Pinit is the initial transmit power
  • ⁇ P is the transmit power to be boosted per resource unit
  • Prb is the number of physical resource blocks PRB pre-allocated by the current eMTC downlink task.
  • the downlink power margin may be shared to the eMTC. Before the downlink task, determining whether the utilization rate of the LTE downlink physical resource block PRB is less than a preset threshold;
  • the downlink power headroom of the LTE downlink scheduling subframe is greater than or equal to the to-be-raised transmit power, the downlink power headroom may be included in the LTE downlink scheduling. If the downlink power reserve corresponding to the subframe is greater than or equal to the to-be-raised transmit power, if the LTE downlink physical resource block PRB usage is less than a preset threshold, the downlink power margin is shared to the eMTC downlink task. .
  • the utilization rate of the LTE downlink physical resource block PRB may be calculated according to the following formula:
  • LTE downlink PRB utilization (the number of PRBs occupied by all GBR services in LTE + the number of PRBs occupied by all NGBR services in LTE * the sum of PBRs of all NGBR services / the actual throughput of all NGBR services) / LTE total available PRBs number.
  • the downlink power control method of the eMTC may include the following steps:
  • step S24 determining whether there is an LTE downlink scheduling subframe power headroom, if yes, performing step S25, if not, calculating and creating an LTE downlink scheduling subframe power headroom, executing step S25;
  • step S25 Determine whether the LTE downlink PRB utilization rate is within a cell threshold. If yes, go to step S26; if no, end the process;
  • S27 Determine whether the RNTP high-power indication sent by the neighboring cell is received on the PRB resource corresponding to the instance. If not, the low-to-high traversal is performed according to the repetition set element ni, and the downlink power value that needs to be increased is calculated according to the descending repetition quantity, and then Determining whether the power value to be upgraded is greater than zero and within the downlink power boost threshold; if yes, ending the process;
  • S29 Perform a statistical update of the RNTP (relative narrowband transmit power) of the local cell according to the scheduling result, wait for the new TTI scheduling pre-allocation result, and calculate and update the LTE downlink PRB utilization rate and the LTE downlink scheduling subframe power headroom table as new The basis of a round of process.
  • RNTP relative narrowband transmit power
  • the LTE idle power resource can be effectively utilized to implement the dynamic enhancement of the eMTC downlink power, the number of PDSCH repetitions in the Mode B is reduced, the access delay and the downlink HARQ RTT are reduced, and the PDSCH time-frequency resource in the Mode B is solved. Longer time occupation can not release the problem and increase the flexibility of downlink scheduling.
  • FIG. 3 is a schematic diagram of overall signal flow of a downlink power control method for an eMTC according to an embodiment of the present disclosure.
  • the control method may include: a decision process, an implementation process, and a maintenance process. These three processes are described in detail in Figures 4 to 6 respectively.
  • the process of the decision is as follows: determining whether the cell can perform LTE and eMTC downlink power sharing and creating an eMTC Mode B downlink power to be upgraded queue; if downlink power sharing is possible, the implementation process is triggered; if downlink power sharing cannot be performed, the maintenance process is directly triggered;
  • the implementation process is: traversing the downlink power to be upgraded queue, and filtering out the UE instance in which the eMTC can perform downlink power boosting and scheduling update, triggering the maintenance process;
  • the RNTP, LTE downlink PRB utilization rate, and LTE downlink scheduling subframe power headroom are statistically updated under the trigger of the implementation process or the decision process for the decision of the new TTI in the decision process.
  • the decision process may include the following steps:
  • Step 201 Determine whether the cell LTE and eMTC power sharing switch is turned on; if not, go to step 202; if yes, go to step 203;
  • Step 202 Exit the decision process and enter the maintenance process.
  • Step 203 traverse the eMTC pre-adjusted downlink queue to find out whether there is a MSG2, MSG4, retransmission or new transmission to be assigned by the DCI in Mode B. If not, go to step 202; if yes, go to step 204;
  • Step 204 Create a corresponding Mode B downlink power to be upgraded queue.
  • Step 205 Determine whether there is an LTE downlink scheduling subframe power headroom; if not, go to step 206; if yes, go to step 207;
  • Step 206 Create an LTE downlink scheduling subframe power headroom (calculate and fill in the downlink power headroom according to the subframe budget from the current scheduling subframe, and fill in the margin of the current scheduling subframe budget in Table 0, and fill in the form 1
  • the next scheduling subframe is forwarded to the next.
  • the LTE downlink power margin LTE downlink available power - LTE downlink GBR service reserved power - LTE downlink NGBR service reserved power - LTE cut-in reserved power), step 209 is performed;
  • Step 207 Determine whether the LTE downlink PRB utilization is smaller than the cell downlink PRB utilization threshold; if not, go to step 202; if yes, go to step 208;
  • Step 208 Enter the implementation process.
  • the implementation process may include:
  • Step 301 Determine whether there is an unprocessed instance of the Mode B downlink power to be upgraded queue; if not, execute Step 302, if yes, perform step 303;
  • Step 302 Exit the implementation process and enter the maintenance process.
  • Step 303 Acquire a PDSCH downlink power (Pinit), a time-frequency resource, a PRB number (Prb), a repetition number (R), an Rmax, and a corresponding repetition set ⁇ n1, n2, n3, n4, n5, which are pre-allocated by the eMTC instance.
  • Pinit a PDSCH downlink power
  • Prb PRB number
  • R repetition number
  • Rmax an Rmax
  • a corresponding repetition set ⁇ n1, n2, n3, n4, n5, which are pre-allocated by the eMTC instance.
  • Step 304 Determine whether the RRB high-power indication sent by the neighboring cell is received on the PRB resource corresponding to the instance; if not, go to step 301 to process the next instance; if yes, go to step 305;
  • Step 307 it is determined whether ⁇ P is greater than 0; if not, go to step 301, processing the next instance; if yes, step 308;
  • Step 308 Determine whether ⁇ P is less than or equal to the downlink power boost threshold; if not, go to step 310, if no, go to step 309;
  • Step 309 Check the LTE downlink scheduling subframe power margin table, and determine whether the margin table value corresponding to the first ni subframes of the instance time domain resource is greater than or equal to ⁇ P+10*lg (Prb*12); if not, go to Step 310; if yes, go to step 311;
  • Step 310 ni take the next repeated value in the interval (in order from small to large), go to step 306;
  • Step 311 Update the LTE downlink scheduling subframe power headroom (minus the downlink power shared by each corresponding subframe to the eMTC);
  • the maintenance process can include:
  • Step 401 Perform a RNTP statistical update of the cell according to the scheduling result.
  • Step 402 it is determined whether the new TTI scheduling pre-allocation result can be obtained, if not, continue to wait and determine; if yes, step 403;
  • Step 403 Calculate the LTE downlink PRB utilization rate: (the number of PRBs occupied by all GBR services in LTE + the number of PRBs occupied by all NGBR services of LTE * the sum of PBRs of all NGBR services and the actual throughput of all NGBR services) / LTE total Number of available PRBs;
  • Step 404 Calculate and update an LTE downlink scheduling subframe power headroom
  • step 405 the decision process is entered.
  • an embodiment of the present disclosure further provides a downlink power control apparatus of an eMTC, including:
  • the determining unit 71 is configured to determine, according to the downlink resource pre-allocated for the current eMTC downlink task in the eMTC downlink power to be upgraded queue, the to-be-raised transmit power of the eMTC downlink task;
  • the sharing unit 72 is configured to determine, in the determining unit 71, a downlink power headroom corresponding to the LTE downlink scheduling subframe. If the uplink power reserve is greater than or equal to the to-be-raised transmit power, the downlink power balance is shared to the eMTC downlink task, so that the transmit power of the eMTC downlink task is increased, and the corresponding added value is equal to the to-be-raised Transmit power.
  • the downlink power control apparatus of the eMTC can share the downlink power headroom to the eMTC downlink task if the downlink power headroom corresponding to the LTE downlink scheduling subframe is greater than or equal to the to-be-raised transmit power.
  • the LTE idle power resource is effectively utilized to implement the eMTC downlink power dynamic enhancement, and the number of PDSCH repetitions of the eMTC in Mode B is reduced, and the access delay is reduced.
  • downlink HARQ RTT which effectively increases the flexibility of eMTC downlink scheduling.
  • the determining unit 71 may include:
  • the obtaining module is configured to obtain an initial downlink power, an initial repetition quantity, and an upper limit threshold of the downlink repetition quantity pre-allocated for the current eMTC downlink task in the eMTC downlink power to be upgraded queue;
  • a determining module configured to traverse the repeated set determined by the upper limit threshold of the downlink repetition number according to a preset change order of the number of downlink repetitions, and determine that the number of downlink repetitions changes from the initial repetition number to each of the repetition sets
  • the number of times that the initial downlink power needs to be increased is the value of the downlink power to be upgraded.
  • the determining module is exemplarily configurable to determine the power to be boosted according to the following formula:
  • ⁇ Psum is the transmit power to be boosted
  • ⁇ P is the transmit power to be boosted for each resource unit
  • R is the initial number of repetitions
  • ni is any repetition number in the repetition set
  • Prb is the current eMTC downlink task pre The number of physical resource block PRBs allocated.
  • the acquiring module may be further configured to: after obtaining the initial downlink power, the initial repetition number, and the upper threshold of the downlink repetition quantity, which are pre-allocated for the current eMTC downlink task in the eMTC downlink power to be upgraded queue, according to the preset number of downlink repetition times And determining, by using a change order, the initial time-frequency resource pre-allocated for the current eMTC downlink task in the eMTC downlink power to be upgraded queue, before traversing the repetition set determined by the upper threshold of the downlink repetition quantity;
  • the determining module may be further configured to determine, according to the physical resource block corresponding to the initial time-frequency resource, whether a relatively narrow-band transmit power RNTP high-power indication sent by the neighboring cell is received; where the initial time-frequency resource corresponds to the physical resource block In the case that the RNC high power indication sent by the neighboring cell is not received, the repeated set determined by the upper limit threshold of the downlink repetition number is traversed according to a preset change order of the number of downlink repetitions.
  • the sharing unit 71 can include:
  • the remaining quantity determining module is configured to determine a downlink power headroom corresponding to the LTE downlink scheduling subframe according to the following formula:
  • LTE downlink power margin LTE downlink available power - LTE downlink GBR service reserved power - LTE downlink NGBR service reserved power - LTE cut-in reserved power;
  • a comparison module configured to compare a magnitude relationship between the downlink power margin and the to-be-raised transmit power
  • a sharing module configured to have a large downlink power margin corresponding to the LTE downlink scheduling subframe that is compared by the comparing module
  • the downlink power headroom is shared to the eMTC downlink task if the transmitter power to be boosted is equal to or equal to the transmit power to be boosted.
  • the sharing module is exemplarily set as:
  • the resource parameters corresponding to the updated transmit power of the eMTC downlink task are synchronized to the downlink scheduling queue of the eMTC, and the corresponding downlink control information DCI is updated.
  • the determining unit 71 is further configured to: after determining the to-be-raised transmit power of the eMTC downlink task, before the downlink power headroom is shared to the eMTC downlink task, determine an LTE downlink physical resource block PRB. Whether the utilization rate is less than a preset threshold;
  • the sharing unit 72 is exemplarily configurable, if the determining unit 71 determines that the downlink power headroom corresponding to the LTE downlink scheduling subframe is greater than or equal to the to-be-raised transmit power, if the utilization of the LTE downlink physical resource block PRB is less than
  • the preset threshold is used to share the downlink power margin to the eMTC downlink task.
  • the determining unit 71 is exemplarily configurable to calculate the utilization rate of the LTE downlink physical resource block PRB according to the following formula:
  • LTE downlink PRB utilization (the number of PRBs occupied by all GBR services in LTE + the number of PRBs occupied by all NGBR services in LTE * the sum of PBRs of all NGBR services / the actual throughput of all NGBR services) / LTE total available PRBs number.
  • the embodiment of the present disclosure further provides a base station, including the downlink power control device of any one of the eMTCs provided in the foregoing embodiment, and thus can achieve the corresponding technical effects.
  • a base station including the downlink power control device of any one of the eMTCs provided in the foregoing embodiment, and thus can achieve the corresponding technical effects.
  • the foregoing embodiment method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is better.
  • Implementation Based on such understanding, the technical solution of the present disclosure, which is essential or contributes to the related art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, CD-ROM).
  • the instructions include a number of instructions for causing a terminal device (which may be a cell phone, computer, server, air conditioner, or network device, etc.) to perform the methods described in various embodiments of the present disclosure.
  • the method and device for controlling the downlink power of the eMTC provided by the embodiment of the present disclosure, and the base station, can share the downlink power margin to the case where the downlink power headroom corresponding to the LTE downlink scheduling subframe is greater than or equal to the to-be-raised transmit power
  • the eMTC downlink task is used to increase the transmit power of the eMTC downlink task, effectively utilizing the LTE idle power resource to implement the eMTC downlink power dynamic enhancement, and correspondingly reduce the number of PDSCH repetitions of the eMTC in Mode B, and reduce the access.
  • Delay and downlink HARQ RTT which effectively increases the flexibility of eMTC downlink scheduling.

Abstract

本公开涉及一种eMTC的下行功率控制方法及装置、基站，涉及通信技术领域，用以解决相关技术中eMTC Mode B下PDSCH重复次数多，下行调度复杂，容易拥塞的问题。所述方法包括：根据增强机器类型通讯eMTC下行功率待提升队列中为当前eMTC下行任务预分配的下行资源，确定所述eMTC下行任务的待提升发射功率；在LTE下行调度子帧对应的下行功率余量大于或等于所述待提升发射功率的情况下，将所述下行功率余量分享给所述eMTC下行任务，以使所述eMTC下行任务的发射功率增加，且对应的增加值等于所述待提升发射功率。

Description

一种eMTC的下行功率控制方法及装置、基站 技术领域
本公开涉及通信技术领域，特别是涉及一种eMTC的下行功率控制方法及装置、基站。
背景技术
随着通信技术和海量信息与信号处理技术的发展，未来的无线通信网络发展目标已经不仅仅是支持任何人在任何时间任何地点的语音和数据通信需求，而是将更多的机器设备(Machine Device)纳入到无线通信网络的覆盖范围内。在3GPP(3rd Generation Partnership Project，第三代合作伙伴计划)标准中，称为MTC(Machine Type Communication,机器类型通讯)。
3GPP Rel-13中又引入Further LTE Physical Layer Enhancements for MTC(eMTC，增强MTC)。根据eMTC技术特点，在基站侧eMTC是部署于LTE系统之中，频域上占用LTE带宽中的6个PRB(physical resource block，物理资源块)，相比LTE，eMTC的下行覆盖增强主要来源于重发。
针对覆盖增强，eMTC分为两种模式：Mode A和Mode B。其中Mode B下需要大量次数重复(PDSCH(Physical Downlink Shared Channel，物理下行共享信道)最大2048次)来保证覆盖和业务。然而，由于Mode B下在初始接入时可用的参照信息比较少，下行调度上存在的问题是如果采用重复次数大的保守调度，会引起UE接入时间长，而不采用保守调度时，粗估的方式不能保证调度的正确性，有一定概率的MSG2(message 2)不能被UE正确收到，同样会导致随机接入时延大。同时，大量重复次数引起HARQ(Hybrid Automatic Repeat reQuest，混合自动重传请求)RTT(Round Trip Time，往返时延)增加以及时频资源较长时间占用不能释放，会导致多用户时出现拥塞情况和调度复杂度加大。
发明内容
本公开要解决的技术问题是提供一种eMTC的下行功率控制方法及装置、基站，用以解决相关技术中eMTC Mode B下PDSCH重复次数多，下行调度复杂，容易拥塞的问题。
一方面，本公开提供一种eMTC的下行功率控制方法，包括：根据增强机器类型通讯eMTC下行功率待提升队列中为当前eMTC下行任务预分配的下行资源，确定所述eMTC下行任务的待提升发射功率；在LTE下行调度子帧对应的下行功率余量大于或等于所述待提升发射功率的情况下，将所述下行功率余量分享给所述eMTC下行任务，以使所述eMTC下行任务的发射功率增加，且对应的增加值等于所述待提升发射功率。
另一方面，本公开还提供一种eMTC的下行功率控制装置，包括：确定单元，设置 为根据eMTC下行功率待提升队列中为当前eMTC下行任务预分配的下行资源，确定所述eMTC下行任务的待提升发射功率；分享单元，设置为在所述确定单元确定所述LTE下行调度子帧对应的下行功率余量大于或等于所述待提升发射功率的情况下，将所述下行功率余量分享给所述eMTC下行任务，以使所述eMTC下行任务的发射功率增加，且对应的增加值等于所述待提升发射功率。
另一方面，本公开还提供一种基站，包括本公开提供的任一种eMTC的下行功率控制装置。
另一方面，本公开还提供一种存储介质，设置为存储程序代码，所述程序代码用于执行如上任一项所述的eMTC的下行功率控制方法。
本公开实施例提供的eMTC的下行功率控制方法及装置、基站，能够在LTE下行调度子帧对应的下行功率余量大于或等于所述待提升发射功率的情况下，将下行功率余量分享给eMTC下行任务，以使所述eMTC下行任务的发射功率增加，这样，有效的利用了LTE空闲功率资源来实现eMTC下行功率动态增强，也相应地减少了eMTC在Mode B下PDSCH重复次数，缩减了接入时延和下行HARQ RTT，从而有效增加了eMTC下行调度的灵活性。
附图说明
图1是本公开实施例提供的eMTC的下行功率控制方法的一种流程图；
图2是本公开实施例提供的eMTC的下行功率控制方法的另一种流程图；
图3是本公开实施例提供的eMTC的下行功率控制方法的一种整体流程图；
图4是图3中控制过程的一种详细流程图；
图5是图3中控制过程的一种详细流程图；
图6是图3中控制过程的一种详细流程图；
图7是本公开实施例提供的eMTC的下行功率控制装置的一种结构示意图。
具体实施方式
以下结合附图对本公开进行详细说明。应当理解，此处所描述的示例性实施例仅仅用以解释本公开，并不限定本公开。
如图1所示，本公开实施例提供一种eMTC的下行功率控制方法，包括：
S11，根据eMTC下行功率待提升队列中为当前eMTC下行任务预分配的下行资源，确定所述eMTC下行任务的待提升发射功率；
S12，在LTE下行调度子帧对应的下行功率余量大于或等于所述待提升发射功率的情况下，将所述下行功率余量分享给所述eMTC下行任务，以使所述eMTC下行任务的发射功率增加，且对应的增加值等于所述待提升发射功率。
本公开实施例提供的eMTC的下行功率控制方法，能够在LTE下行调度子帧对应的 下行功率余量大于或等于所述待提升发射功率的情况下，将下行功率余量分享给eMTC下行任务，以使所述eMTC下行任务的发射功率增加，这样，有效的利用了LTE空闲功率资源来实现eMTC下行功率动态增强，也相应地减少了eMTC在Mode B下PDSCH重复次数，缩减了接入时延和下行HARQ RTT，从而有效增加了eMTC下行调度的灵活性。
示例性而言，在eMTC的下行业务中，待发送的eMTC下行任务可以进行预调度后置入下行任务队列，可以查找队列中是否有Mode B下待DCI指派的MSG2、MSG4、重传或新传，如果有，创建对应的Mode B下行功率待提升队列，将相应的eMTC下行任务置入创建的下行功率待提升队列。队列中的每个下行任务都有提升发射功率的需求，但能否实现相应的下行功率提升以及具体能提升多少则需要根据eMTC资源情况以及LTE资源情况来具体分析。
可选的，在步骤S11中，根据eMTC下行功率待提升队列中为当前eMTC下行任务预分配的下行资源，确定所述eMTC下行任务的待提升发射功率可包括：
获取eMTC下行功率待提升队列中为当前eMTC下行任务预分配的初始下行功率、初始重复次数以及下行重复次数上限阈值；
按照下行重复次数的预设变化顺序，遍历所述下行重复次数上限阈值所确定的重复集，确定所述下行重复次数从所述初始重复次数变化到所述重复集中的每个重复次数时，所述初始下行功率所需要对应提升的下行功率值为所述eMTC下行任务的待提升发射功率。
示例性而言，eMTC下行功率待提升队列中的当前eMTC下行任务，都被预分配了一些发射参数，例如初始下行功率、初始重复次数以及下行重复次数上限阈值等，如果按照这些参数进行下行任务发送，则发射功率不调整。如果尝试调整上述参数，则有可能需要提升相应的下行发射功率。例如，对于一个下行任务来讲，重复次数与下行功率相关，为了保证空口传输质量，如果要使得重复次数减小，则需要相应的增加下行功率，因此可以在下行重复次数上限阈值所限定的重复集内，选择合适的重复次数和对应的下行功率来替换相应的初始下行任务中参数，以便减小待发送的PDSCH重复次数。
为了找到合适的重复次数与相应的下行功率，可选的，可以按照预先设定的顺序遍历各个重复集。例如，在本公开的一个实施例中，下行重复次数上限阈值为512，其确定的重复集包括4、16、64、128、192、256、384、512，按照重复次数从小到大的顺序遍历该重复集，当下行重复次数从所述初始重复次数变化到所述重复集中的重复次数时，所述初始下行功率所需要对应提升的下行功率值即为eMTC下行任务的待提升发射功率。
示例性而言，eMTC下行任务的待提升发射功率可以根据如下公式确定：
ΔPsum＝ΔP+10*lg(Prb*12)；
ΔP＝10*lg(R/ni)；
其中，ΔPsum为待提升发射功率，ΔP为每个资源单位的待提升发射功率，R为初始重复次数，ni为重复集中的任一重复次数，Prb为当前eMTC下行任务预分配的物理资源块PRB数目。
需要说明的是，LTE中最小资源单位是RE(resource element，资源单位)，每个PRB包括12个RE。ΔP对应每RE的相对功率，因此需要加上当前eMTC下行任务所分配的总RE数目(即PRB数目*12)对应的dB值，这样算出来是绝对功率值。
为了避免提高发射功率对附近其他小区形成干扰，在本公开的一个实施例中，获取eMTC下行功率待提升队列中为当前eMTC下行任务预分配的初始下行功率、初始重复次数以及下行重复次数上限阈值之后，所述按照下行重复次数的预设变化顺序，遍历所述下行重复次数上限阈值所确定的重复集之前，还可包括如下步骤：
获取eMTC下行功率待提升队列中为当前eMTC下行任务预分配的初始时频资源；
确定所述初始时频资源对应的物理资源块上是否收到邻小区发来的相对窄带发射功率RNTP高功率指示；
所述按照下行重复次数的预设变化顺序，遍历所述下行重复次数上限阈值所确定的重复集包括：
在所述初始时频资源对应的物理资源块上没有收到邻小区发来的相对窄带发射功率RNTP高功率指示的情况下，按照下行重复次数的预设变化顺序，遍历所述下行重复次数上限阈值所确定的重复集。在所述初始时频资源对应的物理资源块上接收到邻小区发来的相对窄带发射功率RNTP高功率指示的情况下，则放弃进行功率提升。
确定了待提升发射功率之后，即可判断LTE下行调度子帧对应的下行功率余量是否能满足该待提升发射功率的要求。在LTE下行调度子帧对应的下行功率余量大于或等于所述待提升发射功率的情况下，将所述下行功率余量分享给所述eMTC下行任务，示例性的可包括如下步骤：
根据如下公式确定LTE下行调度子帧对应的下行功率余量：
LTE下行功率余量＝LTE下行可用功率-LTE下行GBR业务预留功率-LTE下行NGBR业务预留功率-LTE切入预留功率；
比较所述下行功率余量与所述待提升发射功率的大小关系；
在LTE下行调度子帧对应的下行功率余量大于或等于所述待提升发射功率的情况下，将所述下行功率余量分享给所述eMTC下行任务。
例如，如果eMTC下行任务的待提升发射功率为10db，LTE下行调度子帧对应的下行功率余量为12db，则可以将LTE下行调度子帧对应的下行功率余量分享给当前eMTC下行任务。如果LTE下行调度子帧对应的下行功率余量为6db，则可以增大重复次数，降低eMTC下行任务的待提升发射功率，当eMTC下行任务的待提升发射功率小于或等于6db时，将LTE下行调度子帧对应的下行功率余量分享给当前eMTC下行任务。
可选的，可以通过如下步骤将所述下行功率余量分享给所述eMTC下行任务：
更新所述eMTC下行任务的发射功率；
将更新后的所述eMTC下行任务的发射功率所对应的资源参数同步到eMTC的下行调度队列，并更新相应的下行控制信息DCI。
按照如下公式更新所述eMTC下行任务的发射功率：
Pnew＝Pinit+ΔP+10*lg(Prb*12)
其中，Pnew为更新后的发射功率，Pinit为初始发射功率，ΔP为每个资源单位的待提升发射功率，Prb为当前eMTC下行任务预分配的物理资源块PRB数目。
在一实施例中的，为了确保LTE下行调度子帧功率分享后不影响自身的性能，可以在确定所述eMTC下行任务的待提升发射功率之后，将所述下行功率余量分享给所述eMTC下行任务之前，确定LTE下行物理资源块PRB的利用率是否小于预设阈值；
则步骤S12中在LTE下行调度子帧对应的下行功率余量大于或等于所述待提升发射功率的情况下，将所述下行功率余量分享给所述eMTC下行任务可包括：在LTE下行调度子帧对应的下行功率余量大于或等于所述待提升发射功率的情况下，如果LTE下行物理资源块PRB的利用率小于预设阈值，将所述下行功率余量分享给所述eMTC下行任务。
示例性而言，可以根据如下公式计算LTE下行物理资源块PRB的利用率：
LTE下行PRB的利用率＝(LTE所有GBR业务占用的PRB数+LTE所有NGBR业务占用的PRB数*所有NGBR业务的PBR之和/所有NGBR业务的实际吞吐量之和)/LTE总的可用PRB数。
下面通过示例性实施例详细说明本公开提供的eMTC的下行功率控制方法。
如图2所示，本实施例提供的eMTC的下行功率控制方法可包括如下步骤：
S21，判断同小区的FDD LTE和eMTC下行功率共享开关是否打开；
S22，如果使能功率共享，遍历eMTC预调度后的下行队列，查找队列中是否有Mode B下待DCI指派的MSG2、MSG4、重传或新传；如果是，执行步骤S23；如果否，结束流程；
S23，创建对应的Mode B下行功率待提升队列；
S24，判断是否存在LTE下行调度子帧功率余量表，如果是，执行步骤S25，如果否，则计算并创建LTE下行调度子帧功率余量表，执行步骤S25；
S25，判断LTE下行PRB利用率是否在小区阈值内，如果是，执行步骤S26；如果否，结束流程；
S26，遍历Mode B下行功率待提升队列，判断是否有还未进行过功率提升处理的实例，如果是，获取该eMTC实例预分配的PDSCH下行功率、时频资源、重复次数、Rmax以及对应的重复集；如果否，结束流程；
S27，判断该实例对应的PRB资源上是否收到有邻小区发来的RNTP高功率指示，如果否，按照重复集元素ni从低到高遍历，计算下降重复次数需要提升的下行功率值，然后判断待提升的功率值是否在大于零且在下行功率提升阈值内；如果是，结束流程；
S28，如果待提升的功率值满足条件，查LTE下行调度子帧功率余量表，判断该实例时域资源的前ni个子帧对应的功率余量值是否大于等于待提升的功率值；如果是，则占用并更新LTE下行调度子帧功率余量表，更新该实例下行功率和重复次数，并同步到 eMTC的下行调度队列进行DCI更新；
S29，根据调度结果进行本小区RNTP(相对窄带发射功率)统计更新，等待获取新TTI调度预分配结果，获取到后计算更新LTE下行PRB利用率和LTE下行调度子帧功率余量表，作为新一轮流程的依据。
采用上述技术方案后，能够有效的利用LTE空闲功率资源来实现eMTC下行功率动态增强，减少了Mode B下PDSCH重复次数，缩减了接入时延和下行HARQ RTT，解决Mode B下PDSCH时频资源较长时间占用不能释放问题，增加下行调度的灵活性。
图3所示为本公开实施例提供的eMTC的下行功率控制方法的整体信号流向示意图。如图3所示，该控制方法可包括：判决过程、实施过程和维护过程。图4至图6分别对这三个过程进行详细的说明。
判决过程：判断小区是否可以进行LTE和eMTC下行功率共享及创建eMTC Mode B下行功率待提升队列；如果可以进行下行功率共享，则触发实施过程；如果不能进行下行功率共享，则直接触发维护过程；
实施过程：在判决过程触发下，遍历下行功率待提升队列，筛选出eMTC可以进行下行功率提升的UE实例并进行调度更新，触发维护过程；
维护过程：在实施过程或判决过程的触发下，统计更新RNTP、LTE下行PRB利用率和LTE下行调度子帧功率余量表，以供判决过程新TTI时的判决。
示例性而言，如图4所示，判决过程可包括如下步骤：
步骤201：判断小区LTE和eMTC功率共享开关是否打开；如果否，执行步骤202；如果是，执行步骤203；
步骤202：退出判决过程，进入维护过程；
步骤203：遍历eMTC预调后的下行队列，查找是否有Mode B下待DCI指派的MSG2、MSG4、重传或新传，如果否，执行步骤202；如果是，执行步骤204；
步骤204：创建对应的Mode B下行功率待提升队列；
步骤205：判断是否存在LTE下行调度子帧功率余量表；如果否，执行步骤206；如果是，执行步骤207；
步骤206：创建LTE下行调度子帧功率余量表(从当前调度子帧开始计算并填入按子帧预算的下行功率余量，表格0填入当前调度子帧预算的余量，表格1填入下一调度子帧，依次往后。LTE下行功率余量＝LTE下行可用功率-LTE下行GBR业务预留功率-LTE下行NGBR业务预留功率-LTE切入预留功率)，执行步骤209；
步骤207：判断LTE下行PRB利用率是否小于小区下行PRB利用率阈值；如果否，执行步骤202；如果是，执行步骤208；
步骤208：进入实施过程。
示例性而言，如图5所示，实施过程可包括：
步骤301：判断Mode B下行功率待提升队列是否还有未处理的实例；如果否，执行 步骤302，如果是，执行步骤303；
步骤302：退出实施过程，进入维护过程；
步骤303：获取该eMTC实例预分配的PDSCH下行功率(Pinit)、时频资源和PRB数目(Prb)、重复次数(R)，Rmax以及对应的重复集{n1,n2,n3,n4,n5,n6,n7,n8}；
步骤304：判断该实例对应的PRB资源上是否收到邻小区发来的RNTP高功率指示；如果否，转到步骤301，处理下一个实例；如果是，执行步骤305；
步骤305：设该实例待遍历的重复值区间为重复集内在n1～R之间的元素，令ni＝n1；
步骤306，计算R下降到ni需要增加的下行功率值：ΔP＝10*lg(R/ni)；
步骤307，判断ΔP是否大于0；如果否，转到步骤301，处理下一个实例；如果是，执行步骤308；
步骤308：判断ΔP是否小于等于下行功率提升阈值；如果否，转到步骤310，如果否，转到步骤309；
步骤309：查LTE下行调度子帧功率余量表，判断该实例时域资源的前ni个子帧对应的余量表格值是否大于等于ΔP+10*lg(Prb*12)；如果否，转到步骤310；如果是，转到步骤311；
步骤310：ni取区间内下一个重复值(按从小到大的顺序)，转到步骤306；
步骤311：更新LTE下行调度子帧功率余量表(减去各相应子帧共享给eMTC的下行功率)；
步骤312：更新下行功率Pnew＝Pinit+ΔP+10*lg(Prb*12)，重复次数R＝ni，同步到eMTC的下行调度队列进行DCI更新，从Mode B下行功率待提升队列中删除该实例，转到步骤301，处理下一个实例。
如图6所示，维护过程可包括：
步骤401，根据调度结果进行本小区RNTP统计更新；
步骤402，判断是否能获取到新TTI调度预分配结果，如果否，继续等待并判断；如果是，执行步骤403；
步骤403，计算LTE下行PRB利用率：(LTE所有GBR业务占用的PRB数+LTE所有NGBR业务占用的PRB数*所有NGBR业务的PBR之和/所有NGBR业务的实际吞吐量之和)/LTE总的可用PRB数；
步骤404，计算更新LTE下行调度子帧功率余量表；
步骤405，进入判决过程。
相应的，如图7所示，本公开的实施例还提供一种eMTC的下行功率控制装置，包括：
确定单元71，设置为根据eMTC下行功率待提升队列中为当前eMTC下行任务预分配的下行资源，确定所述eMTC下行任务的待提升发射功率；
分享单元72，设置为在确定单元71确定所述LTE下行调度子帧对应的下行功率余量 大于或等于所述待提升发射功率的情况下，将所述下行功率余量分享给所述eMTC下行任务，以使所述eMTC下行任务的发射功率增加，且对应的增加值等于所述待提升发射功率。
本公开实施例提供的eMTC的下行功率控制装置，能够在LTE下行调度子帧对应的下行功率余量大于或等于所述待提升发射功率的情况下，将下行功率余量分享给eMTC下行任务，以使所述eMTC下行任务的发射功率增加，这样，有效的利用了LTE空闲功率资源来实现eMTC下行功率动态增强，也相应地减少了eMTC在Mode B下PDSCH重复次数，缩减了接入时延和下行HARQ RTT，从而有效增加了eMTC下行调度的灵活性。
可选的，确定单元71可包括：
获取模块，设置为获取eMTC下行功率待提升队列中为当前eMTC下行任务预分配的初始下行功率、初始重复次数以及下行重复次数上限阈值；
确定模块，设置为按照下行重复次数的预设变化顺序，遍历所述下行重复次数上限阈值所确定的重复集，确定所述下行重复次数从所述初始重复次数变化到所述重复集中的每个重复次数时，所述初始下行功率所需要对应提升的下行功率值为所述eMTC下行任务的待提升发射功率。
可选的，确定模块示例性地可设置为根据如下公式确定所述待提升功率：
ΔPsum＝ΔP+10*lg(Prb*12)；
ΔP＝10*lg(R/ni)；
其中，ΔPsum为所述待提升发射功率，ΔP为每个资源单位的待提升发射功率，R为所述初始重复次数，ni为所述重复集中的任一重复次数，Prb为当前eMTC下行任务预分配的物理资源块PRB数目。
可选的，所述获取模块，还可用于在获取eMTC下行功率待提升队列中为当前eMTC下行任务预分配的初始下行功率、初始重复次数以及下行重复次数上限阈值之后，按照下行重复次数的预设变化顺序，遍历所述下行重复次数上限阈值所确定的重复集之前，获取eMTC下行功率待提升队列中为当前eMTC下行任务预分配的初始时频资源；
所述确定模块，还可用于确定所述初始时频资源对应的物理资源块上是否收到邻小区发来的相对窄带发射功率RNTP高功率指示；在所述初始时频资源对应的物理资源块上没有收到邻小区发来的相对窄带发射功率RNTP高功率指示的情况下，按照下行重复次数的预设变化顺序，遍历所述下行重复次数上限阈值所确定的重复集。
可选的，分享单元71可包括：
余量确定模块，设置为根据如下公式确定LTE下行调度子帧对应的下行功率余量：
LTE下行功率余量＝LTE下行可用功率-LTE下行GBR业务预留功率-LTE下行NGBR业务预留功率-LTE切入预留功率；
比较模块，设置为比较所述下行功率余量与所述待提升发射功率的大小关系；
分享模块，设置为在所述比较模块比较的LTE下行调度子帧对应的下行功率余量大 于或等于所述待提升发射功率的情况下，将所述下行功率余量分享给所述eMTC下行任务。
可选的，所述分享模块，示例性地可设置为：
更新所述eMTC下行任务的发射功率；
将更新后的所述eMTC下行任务的发射功率所对应的资源参数同步到eMTC的下行调度队列，并更新相应的下行控制信息DCI。
可选的，确定单元71，还可设置为在确定所述eMTC下行任务的待提升发射功率之后，将所述下行功率余量分享给所述eMTC下行任务之前，确定LTE下行物理资源块PRB的利用率是否小于预设阈值；
分享单元72，示例性地可设置为在确定单元71确定LTE下行调度子帧对应的下行功率余量大于或等于所述待提升发射功率的情况下，如果LTE下行物理资源块PRB的利用率小于预设阈值，将所述下行功率余量分享给所述eMTC下行任务。
可选的，确定单元71，示例性地可设置为根据如下公式计算LTE下行物理资源块PRB的利用率：
LTE下行PRB的利用率＝(LTE所有GBR业务占用的PRB数+LTE所有NGBR业务占用的PRB数*所有NGBR业务的PBR之和/所有NGBR业务的实际吞吐量之和)/LTE总的可用PRB数。
相应的，本公开的实施例还提供一种基站，包括前述实施例提供的任一种eMTC的下行功率控制装置，因此也能实现相应的技术效果，前文已经进行了详细说明，此处不再赘述。
需要说明的是，在本文中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到上述实施例方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本公开的技术方案本质上或者说对相关技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质(如ROM/RAM、磁碟、光盘)中，包括若干指令用以使得一台终端设备(可以是手机，计算机，服务器，空调器，或者网络设备等)执行本公开各个实施例所述的方法。
以上仅为本公开的优选实施例，并非因此限制本公开的专利范围，凡是利用本公开说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本公开的专利保护范围内。
工业实用性
本公开实施例提供的eMTC的下行功率控制方法及装置、基站，能够在LTE下行调度子帧对应的下行功率余量大于或等于所述待提升发射功率的情况下，将下行功率余量分享给eMTC下行任务，以使所述eMTC下行任务的发射功率增加，有效的利用了LTE空闲功率资源来实现eMTC下行功率动态增强，也相应地减少了eMTC在Mode B下PDSCH重复次数，缩减了接入时延和下行HARQ RTT，从而有效增加了eMTC下行调度的灵活性。

Claims (18)

  1. 一种eMTC的下行功率控制方法，其中，包括：
    根据增强机器类型通讯eMTC下行功率待提升队列中为当前eMTC下行任务预分配的下行资源，确定所述eMTC下行任务的待提升发射功率；
    在LTE下行调度子帧对应的下行功率余量大于或等于所述待提升发射功率的情况下，将所述下行功率余量分享给所述eMTC下行任务，以使所述eMTC下行任务的发射功率增加，且对应的增加值等于所述待提升发射功率。
  2. 根据权利要求1所述的方法，其中，根据eMTC下行功率待提升队列中为当前eMTC下行任务预分配的下行资源，确定所述eMTC下行任务的待提升发射功率包括：
    获取eMTC下行功率待提升队列中为当前eMTC下行任务预分配的初始下行功率、初始重复次数以及下行重复次数上限阈值；
    按照下行重复次数的预设变化顺序，遍历所述下行重复次数上限阈值所确定的重复集，确定所述下行重复次数从所述初始重复次数变化到所述重复集中的每个重复次数时，所述初始下行功率所需要对应提升的下行功率值为所述eMTC下行任务的待提升发射功率。
  3. 根据权利要求2所述的方法，其中，所述确定所述下行重复次数从所述初始重复次数变化到所述重复集中的每个重复次数时，所述初始下行功率所需要对应提升的下行功率值为所述eMTC下行任务的待提升发射功率包括：
    ΔPsum＝ΔP+10*lg(Prb*12)；
    ΔP＝10*lg(R/ni)；
    其中，ΔPsum为所述待提升发射功率，ΔP为每个资源单位的待提升发射功率，R为所述初始重复次数，ni为所述重复集中的任一重复次数，Prb为当前eMTC下行任务预分配的物理资源块PRB数目。
  4. 根据权利要求2所述的方法，其中，所述获取eMTC下行功率待提升队列中为当前eMTC下行任务预分配的初始下行功率、初始重复次数以及下行重复次数上限阈值之后，所述按照下行重复次数的预设变化顺序，遍历所述下行重复次数上限阈值所确定的重复集之前，还包括：
    获取eMTC下行功率待提升队列中为当前eMTC下行任务预分配的初始时频资源；
    确定所述初始时频资源对应的物理资源块上是否收到邻小区发来的相对窄带发射功率RNTP高功率指示；
    所述按照下行重复次数的预设变化顺序，遍历所述下行重复次数上限阈值所确定的重复集包括：
    在所述初始时频资源对应的物理资源块上没有收到邻小区发来的相对窄带发射功率RNTP高功率指示的情况下，按照下行重复次数的预设变化顺序，遍历所述下行重复次数上限阈值所确定的重复集。
  5. 根据权利要求1所述的方法，其中，所述在LTE下行调度子帧对应的下行功率余量大于或等于所述待提升发射功率的情况下，将所述下行功率余量分享给所述eMTC下行任务包括：
    根据如下公式确定LTE下行调度子帧对应的下行功率余量：
    LTE下行功率余量＝LTE下行可用功率-LTE下行保证比特率GBR业务预留功率-LTE下行非保证比特率NGBR业务预留功率-LTE切入预留功率；
    比较所述下行功率余量与所述待提升发射功率的大小关系；
    在LTE下行调度子帧对应的下行功率余量大于或等于所述待提升发射功率的情况下，将所述下行功率余量分享给所述eMTC下行任务。
  6. 根据权利要求5所述的方法，其中，所述将所述下行功率余量分享给所述eMTC下行任务包括：
    更新所述eMTC下行任务的发射功率；
    将更新后的所述eMTC下行任务的发射功率所对应的资源参数同步到eMTC的下行调度队列，并更新相应的下行控制信息DCI。
  7. 根据权利要求1所述的方法，其中，在所述确定所述eMTC下行任务的待提升发射功率之后，所述将所述下行功率余量分享给所述eMTC下行任务之前，所述方法还包括：
    确定LTE下行物理资源块PRB的利用率是否小于预设阈值；
    所述在LTE下行调度子帧对应的下行功率余量大于或等于所述待提升发射功率的情况下，将所述下行功率余量分享给所述eMTC下行任务包括：
    在LTE下行调度子帧对应的下行功率余量大于或等于所述待提升发射功率的情况下，如果LTE下行物理资源块PRB的利用率小于预设阈值，将所述下行功率余量分享给所述eMTC下行任务。
  8. 根据权利要求7所述的方法，其中，根据如下公式计算LTE下行物理资源块PRB的利用率：
    LTE下行PRB的利用率＝(LTE所有GBR业务占用的PRB数+LTE所有NGBR业务占用的PRB数*所有NGBR业务的PBR之和/所有NGBR业务的实际吞吐量之和)/LTE总的可用PRB数。
  9. 一种eMTC的下行功率控制装置，其中，包括：
    确定单元，设置为根据eMTC下行功率待提升队列中为当前eMTC下行任务预分配的下行资源，确定所述eMTC下行任务的待提升发射功率；
    分享单元，设置为在所述确定单元确定所述LTE下行调度子帧对应的下行功率余量大于或等于所述待提升发射功率的情况下，将所述下行功率余量分享给所述eMTC下行任务，以使所述eMTC下行任务的发射功率增加，且对应的增加值等于所述待提升发射功率。
  10. 根据权利要求9所述的装置，其中，所述确定单元包括：
    获取模块，设置为获取eMTC下行功率待提升队列中为当前eMTC下行任务预分配的初始下行功率、初始重复次数以及下行重复次数上限阈值；
    确定模块，设置为按照下行重复次数的预设变化顺序，遍历所述下行重复次数上限阈值所确定的重复集，确定所述下行重复次数从所述初始重复次数变化到所述重复集中的每个重复次数时，所述初始下行功率所需要对应提升的下行功率值为所述eMTC下行任务的待提升发射功率。
  11. 根据权利要求10所述的装置，其中，所述确定模块设置为根据如下公式确定所述待提升功率：
    ΔPsum＝ΔP+10*lg(Prb*12)；
    ΔP＝10*lg(R/ni)；
    其中，ΔPsum为所述待提升发射功率，ΔP为每个资源单位的待提升发射功率，R为所述初始重复次数，ni为所述重复集中的任一重复次数，Prb为当前eMTC下行任务预分配的物理资源块PRB数目。
  12. 根据权利要求10所述的装置，其中，
    所述获取模块，还设置为在获取eMTC下行功率待提升队列中为当前eMTC下行任务预分配的初始下行功率、初始重复次数以及下行重复次数上限阈值之后，按照下行重复次数的预设变化顺序，遍历所述下行重复次数上限阈值所确定的重复集之前，获取eMTC下行功率待提升队列中为当前eMTC下行任务预分配的初始时频资源；
    所述确定模块，还设置为确定所述初始时频资源对应的物理资源块上是否收到邻小区发来的相对窄带发射功率RNTP高功率指示；在所述初始时频资源对应的物理资源块上没有收到邻小区发来的相对窄带发射功率RNTP高功率指示的情况下，按照下行重复次数的预设变化顺序，遍历所述下行重复次数上限阈值所确定的重复集。
  13. 根据权利要求9所述的装置，其中，所述分享单元包括：
    余量确定模块，设置为根据如下公式确定LTE下行调度子帧对应的下行功率余量：
    LTE下行功率余量＝LTE下行可用功率-LTE下行GBR业务预留功率-LTE下行NGBR业务预留功率-LTE切入预留功率；
    比较模块，设置为比较所述下行功率余量与所述待提升发射功率的大小关系；
    分享模块，设置为在所述比较模块比较的LTE下行调度子帧对应的下行功率余量大于或等于所述待提升发射功率的情况下，将所述下行功率余量分享给所述eMTC下行任务。
  14. 根据权利要求13所述的装置，其中，所述分享模块，设置为：
    更新所述eMTC下行任务的发射功率；
    将更新后的所述eMTC下行任务的发射功率所对应的资源参数同步到eMTC的下行调度队列，并更新相应的下行控制信息DCI。
  15. 根据权利要求9所述的装置，其中，所述确定单元，还设置为在确定所述eMTC下行任务的待提升发射功率之后，将所述下行功率余量分享给所述eMTC下行任务之前，确定LTE下行物理资源块PRB的利用率是否小于预设阈值；
    所述分享单元，设置为在所述确定单元确定LTE下行调度子帧对应的下行功率余量大于或等于所述待提升发射功率的情况下，如果LTE下行物理资源块PRB的利用率小于预设阈值，将所述下行功率余量分享给所述eMTC下行任务。
  16. 根据权利要求15所述的装置，其中，所述确定单元，设置为根据如下公式计算LTE下行物理资源块PRB的利用率：
    LTE下行PRB的利用率＝(LTE所有GBR业务占用的PRB数+LTE所有NGBR业务占用的PRB数*所有NGBR业务的PBR之和/所有NGBR业务的实际吞吐量之和)/LTE总的可用PRB数。
  17. 一种基站，其中，包括权利要求9至16中任一项所述的eMTC的下行功率控制装置。
  18. 一种存储介质，设置为存储程序代码，所述程序代码用于执行权利要求1至8中任一项所述的eMTC的下行功率控制方法。
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