CN109392072B - Power headroom calculation method - Google Patents
Power headroom calculation method Download PDFInfo
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Abstract
The invention provides a power headroom calculation method and a terminal, wherein the method comprises the following steps: s11, in a period of a physical downlink control channel PDCCH, obtaining the theoretical transmitting power for transmitting the uplink synchronous signal and the theoretical transmitting power for transmitting the uplink data by a physical uplink shared channel PUSCH; and S12, calculating the power margin when the uplink synchronization signal and the uplink data are transmitted simultaneously according to the theoretical transmitting power of the uplink synchronization signal and the theoretical transmitting power of the uplink data. The method and the terminal for calculating the power headroom can calculate the power headroom at a multi-subband terminal. By introducing the uplink synchronous signal, the uplink synchronization with the base station side is ensured, and the influence of the theoretical transmitting power for transmitting the uplink synchronous signal on the power margin is considered, so that the calculated power margin is more accurate.
Description
Technical Field
The present invention relates to the field of data transmission technologies, and in particular, to a method for calculating a power headroom.
Background
Currently, in a broadband access system based on a TD-LTE (Time Division-Long Term Evolution) technology, a system available bandwidth is divided into a plurality of continuous or discontinuous sub-bands, and each sub-band is transmitted by an Orthogonal Frequency Division Multiplexing (OFDM) technology. The sub-band may be divided into a synchronization sub-band, a broadcast sub-band, and a traffic sub-band according to functions. The synchronous sub-band is used for transmitting downlink synchronous signals, the broadcast sub-band is used for downlink broadcast and uplink random access, and the service sub-band is used for transmitting services. In order to reduce the cost of the terminal, the system supports a single-subband operation mode, and each physical channel must be independently transmitted on each subband. The terminal can also select a multi-subband working mode according to different hardware capabilities, namely, the terminal works on all or part of subbands, and the terminal with the weakest capability only works on a single subband. A typical application scenario is a TD-LTE230 network, the frequency spectrum of which is distributed discretely in a 230MHz frequency band, namely 223.025 MHz-235.000 MHz, and the frequency spectrum width of each sub-band is 25 kHz. A schematic diagram of the frequency resource distribution of the TD-LTE230 network is shown in fig. 1.
The TD-LTE230 network requires deep coverage support, and in order to improve the transmission performance of each physical channel, a repetitive transmission mode is adopted in the time domain, and a periodic transmission mode is adopted to obtain time diversity gain. Therefore, the timing relationship of data transmission is as follows: in a Physical Downlink Control Channel (PDCCH) period, Uplink data transmitted in an Uplink Shared Channel (PUSCH) and/or Downlink data transmitted in a Downlink Shared Channel (PDSCH) are controlled by the PDCCH, the PDCCH occupies Downlink pilot time slot (DpPTS) symbols of all Downlink subframes and special subframes of a Radio frame, and a transmission time depends on a maximum repetition number of PDCCH information configured by Radio Resource Control (RRC) information and a repetition number of PDCCH information configured by the PUSCH and/or PDSCH information. After the last repeated transmission of the PDCCH is finished, the information transmission of the next radio frame is started through the PUSCH and/or the PDSCH, the PUSCH occupies all uplink subframes of one radio frame (occupies all uplink subframes of one radio frame and an uplink pilot time slot (UpPTS) symbol of a special subframe under individual conditions), and the transmission time depends on the number of the radio frames occupied by the transmission blocks configured by the uplink authorization and the repetition times. The PDSCH occupies all downlink subframes and downlink pilot time slot (DpPTS) symbols of a special subframe of a radio frame, and the transmission time depends on the number of radio frames occupied by a transmission block configured by downlink authorization and the number of repetition times. The feedback information of the Uplink transport block is indicated by New Data Indication (NDI) in the Uplink authorization information of the next PDCCH period separated by one PDCCH period, and the feedback information of the downlink transport block occupies all Uplink subframes of one radio frame, which are carried by an Uplink Control Channel (PUCCH) and used for starting transmission of the next radio frame after the last repeated transmission of the PDSCH. And when the PDSCH transmission time is more than 16 radio frames, the PUCCH occupies 2 radio frames, otherwise, the PUCCH occupies 1 radio frame.
Currently, the power headroom calculation method is only for single subband transmission, i.e. the power headroom when the PUSCH transmits data alone, and for multi-subband transmission, no corresponding power headroom calculation method is given. If the power headroom calculation method used for calculating the single subband transmission data is still used for calculation, a large error is caused. It is desirable to provide a power headroom calculation method for calculating the power headroom in multi-subband transmission.
Disclosure of Invention
To overcome the above problems or at least partially solve the above problems, the present invention provides a power headroom calculation method and a terminal.
In one aspect, the present invention provides a method for calculating a power headroom, including:
s11, in a period of a physical downlink control channel PDCCH, obtaining the theoretical transmitting power for transmitting the uplink synchronous signal and the theoretical transmitting power for transmitting the uplink data by a physical uplink shared channel PUSCH;
and S12, calculating the power margin when the uplink synchronization signal and the uplink data are transmitted simultaneously according to the theoretical transmitting power of the uplink synchronization signal and the theoretical transmitting power of the uplink data.
Preferably, the acquiring the theoretical transmission power for transmitting the uplink synchronization signal in S11 specifically includes:
acquiring theoretical transmitting power of uplink control information transmitted by a Physical Uplink Control Channel (PUCCH);
and taking the theoretical transmitting power for transmitting the uplink control information as the theoretical transmitting power of the uplink synchronous signal.
Preferably, S11 is followed by:
and calculating the power margin when the uplink control information and the uplink data are transmitted simultaneously according to the theoretical transmitting power for transmitting the uplink control information and the theoretical transmitting power for transmitting the uplink data.
Preferably, the S12 specifically includes: according to the theoretical transmitting power for transmitting the uplink synchronizing signal and the theoretical transmitting power for transmitting the uplink data, calculating the power margin when the uplink synchronizing signal and the uplink data are transmitted simultaneously by using the following formula:
wherein, PMAXFor the maximum transmit power, M, of the terminal UEPUSCH(i) Is the transmission bandwidth in the authorized PUSCH, the unit is a sub-band; pO_PUSCH(0) The expected received power of the transmission uplink data when the authorized PUSCH is dynamically scheduled for transmission; pO_PUSThe expected received power for the transmission uplink synchronization signal; alpha (0) is a cell-specific parameter configured by a network side during the transmission of the dynamically scheduled and authorized PUSCH; PL is the downlink path loss evaluated by the UE; deltaTF(i) Is a transport format offset value; f (0) is a closed loop power control adjustment value during the PUSCH transmission of the dynamic scheduling authorization; PH value1(i) A power margin for simultaneous transmission of the uplink synchronization signal and the uplink data; i is the period of PDCCH;
in order to transmit the theoretical transmission power of the uplink data,
and transmitting the theoretical transmitting power of the uplink synchronous signal.
Preferably, the calculating, according to the theoretical transmission power for transmitting the uplink control information and the theoretical transmission power for transmitting the uplink data, the power headroom when the uplink control information and the uplink data are transmitted simultaneously is specifically calculated by using the following formula:
wherein, PMAXFor the maximum transmit power, M, of the terminal UEPUSCH(i) Is the transmission bandwidth in the authorized PUSCH, the unit is a sub-band; pO_PUSCH(0) Expected received power, P, for dynamically scheduling authorized PUSCH transmissionsO_PUCCHThe expected received power for transmitting the uplink control information is obtained; alpha (0) is a cell-specific parameter configured by a network side during the transmission of the dynamically scheduled and authorized PUSCH; PL is the downlink path loss evaluated by the UE; deltaTF(i) Is a transport format offset value; f (0) is a closed loop power control adjustment value during the PUSCH transmission of the dynamic scheduling authorization; PH value2(i) A power headroom for simultaneously transmitting the uplink control information and the uplink data; i is the period of PDCCH;
for the theoretical transmission power when transmitting the uplink data,
the theoretical transmission power for transmitting the uplink control information.
Preferably, the method further comprises:
and after the power headroom is obtained through calculation, reporting a power headroom report containing the power headroom through a Media Access Control (MAC) control unit.
Preferably, the power headroom report occupies 2 bytes, and the power headroom report includes: a first report type parameter, a second report type parameter, a third report type parameter, and a power headroom parameter;
the first report type parameter occupies 3 bits and is used for identifying the report type reported by the MAC control unit; the second report type parameter occupies 2 bits and is used for further indicating the report type to be reported; the third report type parameter occupies 2 bits and is used for determining the source of the power headroom; the power headroom parameter is used to indicate the power headroom level.
In another aspect, the present invention provides a terminal, including: an acquisition unit and a calculation unit.
The device comprises an acquisition unit, a transmission unit and a processing unit, wherein the acquisition unit is used for acquiring theoretical transmitting power for transmitting an uplink synchronous signal and theoretical transmitting power for transmitting uplink data of a Physical Uplink Shared Channel (PUSCH) in one period of a Physical Downlink Control Channel (PDCCH);
and the calculating unit is used for calculating the power margin when the uplink synchronization signal and the uplink data are transmitted simultaneously according to the theoretical transmitting power of the uplink synchronization signal and the theoretical transmitting power of the uplink data.
Preferably, the terminal further includes: and a reporting unit, configured to report, by using a MAC control unit, a power headroom report including the power headroom.
In another aspect, the present invention further provides a terminal, including: at least one processor; and at least one memory communicatively coupled to the processor, wherein: the memory stores program instructions executable by the processor, which calls the program instructions to perform the above-described calculation method.
In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing computer instructions that cause the computer to perform the above-described computing method.
The method and the terminal for calculating the power headroom can calculate the power headroom at a multi-subband terminal. By introducing the uplink synchronous signal, the uplink synchronization with the base station side is ensured, and the influence of the theoretical transmitting power for transmitting the uplink synchronous signal on the power margin is considered, so that the calculated power margin is more accurate.
Drawings
Fig. 1 is a schematic diagram of frequency resource distribution in a 230MHz frequency band in the LTE technology of the prior art;
fig. 2 is a flowchart of a method for calculating a power headroom according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a format of a power headroom report in the power headroom calculation method according to the embodiment of the present invention;
fig. 4 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 2, an embodiment of the present invention provides a method for calculating a power headroom, including: s11, in a period of a physical downlink control channel PDCCH, obtaining the theoretical transmitting power for transmitting the uplink synchronous signal and the theoretical transmitting power for transmitting the uplink data by a physical uplink shared channel PUSCH; and S12, calculating the power margin when the uplink synchronization signal and the uplink data are transmitted simultaneously according to the theoretical transmitting power of the uplink synchronization signal and the theoretical transmitting power of the uplink data.
Specifically, the main process of uplink power control in the LTE technology includes: the user terminal UE receives a Power Control command (TPC) issued by the base station, measures the pilot received Power of the downlink radio channel, calculates Pathloss, and calculates the theoretical uplink transmit Power P according to parameters such as Pathloss, uplink shared channel bandwidth, transport block format, TPC, and the like. If the UE triggers a Power Headroom Report (PHR) and meets the transmission condition, the PHR needs to be transmitted on the uplink shared channel. Finally, after receiving the data and/or PHR transmitted by the physical uplink shared channel, the Evolved NodeB (eNB) sends the TPC to the UE through the physical downlink control channel, and repeatedly performs the above process.
In the system, the UE adopts a dynamic resource allocation mode and an Adaptive channel Coding Modulation (AMC) mode, the uplink theoretical transmission power P is related to resource allocation and AMC, and PHR sent to the eNB by the UE is used as resource budget information of a PUSCH (physical uplink shared channel) to provide a basis for the eNB to perform uplink resource allocation. If the PHR reflects that the UE has a larger power margin, the eNB can allocate more wireless resource blocks to the UE; if the PHR reflects that the UE has no power headroom or no more power headroom, the eNB can only allocate fewer radio resource blocks or low order modulation commands to the UE.
Before specifically describing a specific technical scheme of the present invention, an uplink synchronization signal concept is first introduced into a multi-subband transmission system. In a broadband access system of a TD-LTE (Time Division-Long Term Evolution) technology, a terminal periodically transmits an uplink synchronization signal in the uplink data transmission and/or downlink data transmission process, and is used for ensuring that the uplink synchronization is kept with a base station side, the uplink synchronization signal is transmitted in a UpPTS of a special subframe of a wireless frame, and the period is configured by RRC signaling.
In a Physical Downlink Control Channel (PDCCH) period, a sub-band supports a terminal to transmit Uplink data or Downlink data, the PDCCH and a Physical Downlink Shared Channel (PDSCH) perform time division multiplexing between radio frames, and the Physical Uplink Control Channel (PUCCH) and the Physical Uplink Shared Channel (PUSCH) perform time division multiplexing between radio frames. And when the PUCCH and the PUSCH need to be transmitted in the same radio frame, the PUCCH is preferentially transmitted, and when the uplink synchronous signal and the PUSCH need to be transmitted in the same radio frame, time division multiplexing among OFDM symbols in the radio frame is carried out. It should be noted that the PDCCH carries scheduling and other control information, which specifically includes uplink transmission format, uplink resource allocation, power control and uplink retransmission information, and/or downlink transmission format, downlink resource allocation and downlink retransmission information. The PUCCH transmits uplink control information including a response of HARQ (Hybrid Automatic Repeat reQuest). The PUSCH is used to transmit uplink data, and the PDSCH is used to transmit downlink data.
The PDCCH searching space in the same multi-subband region is divided into two candidate positions, two terminals are supported to transmit uplink data and downlink data respectively, or the same terminal simultaneously transmits the uplink data and the downlink data, initial subbands occupied by the PDCCH, the PUSCH and/or the PDSCH are required to be the same, and the number of the subbands depends on the bandwidth capability of the terminal and uplink authorization or downlink authorization configuration. For example, PUCCH occupies the starting sub-band, the uplink synchronization signal of the authorized user in the first candidate position occupies the starting sub-band, and the uplink synchronization signal of the authorized user in the second candidate position occupies the second sub-band (if different from the authorized user in the first candidate position). When the PUCCH and the PUSCH need to be transmitted in the same wireless frame, the PUCCH occupies the initial sub-band, and the PUSCH occupies the rest sub-bands. When the uplink synchronization signal and the PUSCH need to be transmitted in the same wireless frame, the uplink synchronization signal occupies the UpPTS of the special subframe of the first two sub-bands, the PUSCH occupies all the uplink subframes of the first two sub-bands, and all the uplink subframes and the UpPTS of the special subframe of the other sub-bands.
The UE can be divided into a single sub-band terminal and a multi-sub-band terminal, and when the UE is the single sub-band terminal, the time division multiplexing of each uplink channel only needs to report the power margin when the PUSCH is transmitted independently. And when the terminal transmits uplink data and downlink data simultaneously, the PUSCH and the PUCCH are subjected to frequency division multiplexing in an uplink subframe of the radio frame in one PDCCH period. At this time, the terminal needs to report not only the power headroom during the single transmission of the PUSCH, but also the power headroom during the simultaneous transmission of the PUSCH and the PUCCH, and the power headroom during the simultaneous transmission of the PUSCH and the uplink synchronization signal.
For the power headroom when the PUSCH is transmitted alone, the following formula is used to calculate:
PH(i)＝PMAX-{10log10(MPUSCH(i))+PO_PUSCH(j)+α(j)·PL+△TF(i)+f(i)}
wherein, PMAXMaximum transmission power for the user terminal UE; mPUSCH(i) The unit is a subband, which is the transmission bandwidth of the authorized PUSCH. PO_PUSCH(j) The expected received power for transmitting the uplink data is equal to the cell-specific parameter P configured by the higher layer of the network sideO_NOMINAL_PUSCH(j) And UE specific parameters PO_UE_PUSCH(j) And (4) summing. For a dynamically scheduled granted PUSCH transmission, j is 0, and for a random access response granted PUSCH transmission, j is 1. And has PO_UE_PUSCH(1)＝0、 PO_NOMINAL_PUSCH(1)＝PO_PRE+△PREAMBLE_Msg3In which P isO_PREAnd ΔPREAMBLE_Msg3Configured by the network side high layer. α (j) is a cell-specific parameter configured by a network-side higher layer, and when j is 0, α belongs to {0.6,0.7,0.8,1 }; when j is 1, α (j) is 1. PL is the downlink path loss evaluated at the UE side in dB. DeltaTF(i) For the transport format compensation value, it depends on the UE-specific parameter Ks and the authorized MCS configured by the higher layer on the network side, and will not be described in detail here. (i) the UE closed-loop Power Control adjustment value depends on the UE specific parameter estimated-enabled and the authorized Transmit Power Control (TPC) command configured by the network side higher layer, which will not be described in detail herein; ph (i) is a power headroom when data is transmitted; i is the periodicity of the PDCCH.
When the power margin is calculated by the above formula when the PUSCH is transmitted alone, 10log in the formula10(MPUSCH(i))+PO_PUSCH(j)+α(j)·PL+△TF(i) + f (i) is a theoretical value calculated for the theoretical transmission power when transmitting uplink data, and the calculation result PH (i) of the above formula appears in the actual transmission process<0, in the case of the first embodiment. At this time, the corresponding power margin is a negative value, and the actual transmission power when transmitting the uplink data is no longer 10log of the theoretical transmission power10(MPUSCH(i))+PO_PUSCH(j)+α(j)·PL+△TF(i) + f (i), but PMAX。
And for the power margin when the PUSCH and the uplink synchronous signal are transmitted simultaneously, calculating the power margin when the uplink data and the uplink synchronous signal are transmitted simultaneously according to the obtained theoretical transmitting power for transmitting the uplink data and the theoretical transmitting power for transmitting the uplink synchronous signal. By the introduced uplink synchronization signal, uplink synchronization with the base station side can be guaranteed. However, the introduction of the uplink synchronization signal also needs to consider the theoretical transmission power when transmitting the uplink synchronization signal. When the uplink synchronization signal needs to be transmitted simultaneously with uplink data, firstly, the theoretical transmitting power for transmitting the uplink synchronization signal is obtained, and the power margin when the uplink synchronization signal and the uplink data are transmitted simultaneously is calculated according to the theoretical transmitting power for transmitting the uplink synchronization signal and the theoretical transmitting power for transmitting the uplink data.
In this embodiment, a method for calculating power headroom at a multi-subband terminal is provided, which ensures that uplink synchronization is maintained with a base station side by introducing an uplink synchronization signal, and considers the influence of theoretical transmission power for transmitting the uplink synchronization signal on the power headroom, so that the calculated power headroom is more accurate.
On the basis of the foregoing embodiment, the acquiring the theoretical transmission power for transmitting the uplink synchronization signal in S11 specifically includes: acquiring theoretical transmitting power of uplink control information transmitted by a Physical Uplink Control Channel (PUCCH); and the theoretical transmitting power for transmitting the uplink control information is used as the theoretical transmitting power of the uplink synchronous signal. The theoretical transmitting power of the uplink synchronous signal is easier to obtain, and the calculation speed can be improved.
On the basis of the above embodiment, S11 is followed by: and calculating the power margin when the uplink control information and the uplink data are transmitted simultaneously according to the theoretical transmitting power for transmitting the uplink control information and the theoretical transmitting power for transmitting the uplink data.
Specifically, in this embodiment, in one period of the physical downlink control channel PDCCH, the theoretical transmission power of the physical uplink shared channel PUSCH for transmitting the uplink data and the theoretical transmission power of the physical uplink control channel PUCCH for transmitting the uplink control information are obtained, and the power margin when the uplink data and the uplink control information are transmitted simultaneously is calculated according to the theoretical transmission power of the uplink data and the theoretical transmission power of the uplink control channel PUCCH. The method for calculating the power headroom at the multi-subband terminal is provided, and meanwhile, the influence of the theoretical transmitting power for transmitting the uplink control information on the power headroom is considered, so that the calculated power headroom is more accurate.
On the basis of the foregoing embodiment, S12 specifically includes:
according to the theoretical transmitting power for transmitting the uplink synchronizing signal and the theoretical transmitting power for transmitting the uplink data, calculating the power margin when the uplink synchronizing signal and the uplink data are transmitted simultaneously by using the following formula:
wherein, PMAXFor the maximum transmit power, M, of the terminal UEPUSCH(i) Is the transmission bandwidth in the authorized PUSCH, the unit is a sub-band; pO_PUSCH(0) The expected received power of the transmission uplink data when the authorized PUSCH is dynamically scheduled for transmission; pO_PUSThe expected received power for the transmission uplink synchronization signal; alpha (0) is a cell-specific parameter configured by a network side during the transmission of the dynamically scheduled and authorized PUSCH; PL is the downlink path loss evaluated by the UE; deltaTF(i) Is a transport format offset value; f (0) is a closed loop power control adjustment value during the PUSCH transmission of the dynamic scheduling authorization; i is the period of PDCCH; PH value1(i) A power margin for simultaneous transmission of the uplink synchronization signal and the uplink data;
in order to transmit the theoretical transmission power of the uplink data,
and transmitting the theoretical transmitting power of the uplink synchronous signal.
When the power margin of the uplink synchronous signal and the uplink data are transmitted simultaneously is calculated by using the above formula
And
respectively transmitting the theoretical transmitting power of the uplink data and the theoretical transmitting power of the uplink synchronous signal,
the theoretical transmission power for simultaneously transmitting the uplink data and the uplink synchronous signal is the calculated theoryAnd in the actual transmission process, the transmitting power of the uplink data is preferentially ensured, namely the transmitting power of the uplink data selects the minimum value between the theoretical transmitting power and the maximum transmitting power, and the transmitting power of the uplink synchronous signal selects the difference value obtained by subtracting the transmitting power of the uplink data from the maximum transmitting power and then takes the minimum value with the theoretical transmitting power.
Specifically, the theoretical transmission power of the UE for transmitting uplink data and the theoretical transmission power of the uplink synchronization signal are introduced into the above formula at the same time, so that the remaining power, i.e. the power margin, when the UE transmits uplink data and the uplink synchronization signal at the same time can be calculated through the formula. The formula can be used for calculating the power margin of the multi-subband terminal when the multi-subband terminal simultaneously transmits uplink data and uplink synchronous signals in one period of a Physical Downlink Control Channel (PDCCH).
On the basis of the above embodiment, the calculating, according to the theoretical transmission power for transmitting the uplink control information and the theoretical transmission power for transmitting the uplink data, the power headroom when the uplink control information and the uplink data are transmitted simultaneously is specifically calculated by using the following formula:
wherein, PMAXFor the maximum transmit power, M, of the terminal UEPUSCH(i) Is the transmission bandwidth in the authorized PUSCH, the unit is a sub-band; pO_PUSCH(0) Expected received power, P, for dynamically scheduling authorized PUSCH transmissionsO_PUCCHThe expected received power for transmitting the uplink control information is obtained; alpha (0) is a cell-specific parameter configured by a network side during the transmission of the dynamically scheduled and authorized PUSCH; PL is the downlink path loss evaluated by the UE; deltaTF(i) Is a transport format offset value; f (0) is a closed loop power control adjustment value during the PUSCH transmission of the dynamic scheduling authorization; i is the period of PDCCH; PH value2(i) A power headroom for simultaneously transmitting the uplink control information and the uplink data;
for the theoretical transmission power when transmitting the uplink data,
to transmit the theoretical transmit power of the uplink control information,
the theoretical transmission power is the theoretical transmission power when the uplink control information and the uplink data are transmitted simultaneously.
When the power headroom in the case of simultaneous transmission of uplink control information and uplink data is calculated by using the above formula
And
and in the actual transmission process, the transmitting power of the uplink control information is preferentially ensured, namely the transmitting power of the uplink control information selects the minimum value between the theoretical transmitting power and the maximum transmitting power, and the difference value of the maximum transmitting power minus the transmitting power of the uplink control information and the theoretical transmitting power of the uplink data are selected to be the minimum value.
Specifically, the theoretical transmission power of the UE for transmitting uplink data and the theoretical transmission power of the UE for transmitting uplink control information are introduced in the above formula at the same time, so that the remaining power, i.e. the power margin, when the UE transmits uplink data and uplink control information at the same time can be calculated through the formula. The formula can be used for calculating the power margin of the multi-subband terminal when the multi-subband terminal simultaneously transmits uplink data and uplink control information in one period of a Physical Downlink Control Channel (PDCCH), so that the calculation result is more accurate.
Based on the above embodiments, the theoretical transmission power for transmitting uplink control information can be directly used as the uplink synchronization signalTheoretical transmission power, at this time, PH1(i) Is calculated by the formula (2) and PH2(i) The calculation formula of (2) is the same. In this case, the same formula can be used to calculate the power headroom when the uplink control information and the uplink data are transmitted simultaneously, and the power headroom when the uplink data and the uplink control information are transmitted simultaneously.
On the basis of the above embodiment, the method for calculating the power headroom further includes: and after the power headroom is obtained through calculation, reporting a Power Headroom Report (PHR) containing the power headroom through a Media Access Control (MAC) control unit.
Specifically, the result of S12 is to calculate the power headroom when the uplink synchronization signal and the uplink data are transmitted simultaneously, and after S12, the method further includes: the UE reports a power headroom report including the power headroom calculated by S12 to the eNB through the MAC control element.
The power margin value obtained through calculation is stepped to 1dB and is taken within the range of [ -6, 57] dB.
The UE needs to report the power headroom to the eNB, and the triggering condition needs to be satisfied. The RRC controls two timers of the PHR, namely a Periodic Timer-PHR-Timer and a Prohibit Timer-PHR-Timer. In the RRC message of MAC-MainConfig, PHR will be triggered under the following conditions: (1) uplink resources exist, and the period-PHR-Timer is overtime; (2) uplink resources exist, the Prohibit-PHR-Timer is overtime, and the change value of the path loss after the last transmission power headroom report is larger than a downlink path loss change parameter dl-pathloss change (the unit is dB); (3) a message to configure a power headroom report is received. When one or more of the three conditions (1), (2) and (3) are satisfied, the UE reports the PHR including the power headroom to the eNB.
And if the uplink resources can accommodate the transmission of the required PHR MAC control unit in the process of the priority processing of the logical channel, calculating the power margin and assembling the PHR MAC control unit. The Periodic-PHR-Timer or the Prohibit-PHR-Timer is started/restarted by manufacturing triggering conditions. Wherein, the PeriodicPHR-Timer, the ProhibitPHR-Timer and the dl-pathlength change are configured to the terminal through RRC signaling.
When reporting the power headroom report containing the power headroom through the MAC control element, the format of the power headroom report is as shown in fig. 3.
The power headroom report occupies 2 bytes, and the power headroom report includes: a first report type parameter, a second report type parameter, a third report type parameter, and a power headroom parameter;
the first report type parameter occupies 3 bits and is used for identifying the report type reported by the MAC control unit; the second report type parameter occupies 2 bits and is used for further indicating the report type to be reported; the third report type parameter occupies 2 bits and is used for determining the source of the power headroom; the power headroom parameter is used to indicate the power headroom level.
Specifically, in practical application, the first report type parameter is specifically represented as a Logical Channel ID (LCID), a field length of the LCID is 3 bits, and when the LCID is 101, the first report type parameter represents that the control unit reports PHR/CQI. The report type reported by the MAC control unit is identified through the LCID, the length is fixed to be 2 bytes which are Oct1 and Oct2 respectively, and the word length of each byte is 8 bits. The second reporting type parameter is specifically denoted as P/C parameter, where P is the first letter of PHR and C is the first letter of CQI. The P/C is used for further indicating the report type reported and determining whether the report is a PHR or a CQI, and the field length is 2 bits. When the value of the P/C is 00, the PHR is reported by the MAC control unit, and when the value of the P/C is 01, the CQI is reported by the MAC control unit. The Power Headroom parameter is specifically represented as Power Headroom (PH), and PH represents a Power Headroom level, i.e., a specific value of the Power Headroom, and the field length is 6 bits.
The third report Type parameter is specifically represented as Type, and is used for indicating the PHR Type when the value of the P/C field is 00, and the field length is 2 bits, and is used for determining the source of the power headroom. When the Type value is 00, indicating the power headroom when only PUSCH is transmitted; when the Type value is 01, indicating the power headroom of the simultaneous transmission of the PUSCH and the PUCCH; and when the Type value is 10, indicating the power headroom of the simultaneous transmission of the PUSCH and the uplink synchronization signal. In fig. 3, R is a reserved bit and is set to 00.
In particular, when a theoretical transmission power for transmitting uplink control information is directly used as a theoretical transmission power of an uplink synchronization signal, PH is set at this time1(i) Is calculated by the formula (2) and PH2(i) The same calculation formula is used, and the same result is obtained. The value of Type can only take 00 or 01, and when the value of Type is 00, the power margin when only PUSCH is transmitted is represented; and when the Type value is 01, the power headroom for the simultaneous transmission of the PUSCH and the PUCCH or the simultaneous transmission of the PUSCH and the uplink synchronous signal is represented.
As shown in fig. 4, an embodiment of the present invention provides a terminal, including: an acquisition unit 51 and a calculation unit 52.
The obtaining unit 51 is configured to obtain, in one period of a physical downlink control channel PDCCH, a theoretical transmission power for transmitting an uplink synchronization signal and a theoretical transmission power for transmitting uplink data on a physical uplink shared channel PUSCH. The calculating unit 52 is configured to calculate a power margin when the uplink synchronization signal and the uplink data are transmitted simultaneously according to the theoretical transmitting power of the uplink synchronization signal and the theoretical transmitting power of the uplink data.
Specifically, the operation flow, the functions and the technical effects of the terminal are all in one-to-one correspondence with the embodiments of the above method, and are not described herein again.
On the basis of the above embodiment, the terminal further includes: and a reporting unit, configured to report, by using a MAC control unit, a power headroom report including the power headroom.
Specifically, the working principle of the MAC control element and the format of the power headroom report are all in one-to-one correspondence with the embodiments of the above methods, and are not described herein again.
In an embodiment of the present invention, a terminal is provided, including:
at least one processor; and at least one memory communicatively coupled to the processor, wherein:
the memory stores program instructions executable by the processor, which are called by the processor to perform the method of calculating the power headroom provided in the above-described method class embodiments, such as: s11, in a period of a physical downlink control channel PDCCH, obtaining the theoretical transmitting power for transmitting the uplink synchronous signal and the theoretical transmitting power for transmitting the uplink data by a physical uplink shared channel PUSCH; and S12, calculating the power margin when the uplink synchronization signal and the uplink data are transmitted simultaneously according to the theoretical transmitting power of the uplink synchronization signal and the theoretical transmitting power of the uplink data.
An embodiment of the present invention provides a non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the method for calculating a power headroom provided in the above method class embodiments, for example: s11, in a period of a physical downlink control channel PDCCH, obtaining the theoretical transmitting power for transmitting the uplink synchronous signal and the theoretical transmitting power for transmitting the uplink data by a physical uplink shared channel PUSCH; and S12, calculating the power margin when the uplink synchronization signal and the uplink data are transmitted simultaneously according to the theoretical transmitting power of the uplink synchronization signal and the theoretical transmitting power of the uplink data.
The invention introduces an uplink synchronous signal which can ensure that the terminal and a base station side keep uplink synchronization in a multi-sub-band terminal, and provides a method for calculating the power margin of the multi-sub-band terminal and the terminal applying the method. Considering the power headroom when the uplink synchronization signal and the uplink data are transmitted simultaneously in the terminal or the uplink control information and the uplink data are transmitted simultaneously, the calculation method provided by the invention is more accurate in calculation result compared with the calculation method of the power headroom in the single subband terminal for calculating the power headroom in the multi-subband terminal.
Finally, the method of the present invention is only a preferred embodiment and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A method for calculating a power headroom, comprising:
s11, in a period of a physical downlink control channel PDCCH, obtaining the theoretical transmitting power for transmitting the uplink synchronous signal and the theoretical transmitting power for transmitting the uplink data by a physical uplink shared channel PUSCH;
s12, calculating the power margin when transmitting the uplink synchronous signal and the uplink data simultaneously according to the theoretical transmitting power of the transmission uplink synchronous signal and the theoretical transmitting power of the transmission uplink data;
the S12 specifically includes:
according to the theoretical transmitting power for transmitting the uplink synchronizing signal and the theoretical transmitting power for transmitting the uplink data, calculating the power margin when the uplink synchronizing signal and the uplink data are transmitted simultaneously by using the following formula:
wherein, PMAXFor the maximum transmit power, M, of the terminal UEPUSCH(i) Is the transmission bandwidth in the authorized PUSCH, the unit is a sub-band; pO_PUSCH(0) The expected received power of the transmission uplink data when the authorized PUSCH is dynamically scheduled for transmission; pO_PUSThe expected received power for the transmission uplink synchronization signal; alpha (0) is a cell-specific parameter configured by a network side during the transmission of the dynamically scheduled and authorized PUSCH; PL is the downlink path loss evaluated by the UE; deltaTF(i) Is a transport format offset value; f, (i) is a closed loop power control adjustment value during the transmission of the dynamically scheduled and authorized PUSCH; PH value1(i) A power margin for simultaneous transmission of the uplink synchronization signal and the uplink data; i is the period of PDCCH;
in order to transmit the theoretical transmission power of the uplink data,
for transmitting the uplink synchronization informationTheoretical transmit power of the symbol.
2. The calculating method according to claim 1, wherein the obtaining the theoretical transmission power for transmitting the uplink synchronization signal in S11 specifically includes:
acquiring theoretical transmitting power of uplink control information transmitted by a Physical Uplink Control Channel (PUCCH);
and taking the theoretical transmitting power for transmitting the uplink control information as the theoretical transmitting power of the uplink synchronous signal.
3. The computing method according to claim 2, wherein S11 is followed by further comprising:
calculating power margin when the uplink control information and the uplink data are transmitted simultaneously according to the theoretical transmitting power of the uplink control information and the theoretical transmitting power of the uplink data;
the calculating, according to the theoretical transmission power for transmitting the uplink control information and the theoretical transmission power for transmitting the uplink data, a power headroom when the uplink control information and the uplink data are transmitted simultaneously is specifically calculated by using the following formula:
wherein, PMAXFor the maximum transmit power, M, of the terminal UEPUSCH(i) Is the transmission bandwidth in the authorized PUSCH, the unit is a sub-band; pO_PUSCH(0) Expected received power, P, for dynamically scheduling authorized PUSCH transmissionsO_PUCCHThe expected received power for transmitting the uplink control information is obtained; alpha (0) is a cell-specific parameter configured by a network side during the transmission of the dynamically scheduled and authorized PUSCH; PL is the downlink path loss evaluated by the UE; deltaTF(i) Is a transport format offset value; f, (i) is a closed loop power control adjustment value during the transmission of the dynamically scheduled and authorized PUSCH;
PH2(i) for simultaneous transmission of the uplink controlInformation and power headroom in the uplink data; i is the period of PDCCH;
for the theoretical transmission power when transmitting the uplink data,
the theoretical transmission power for transmitting the uplink control information.
4. The computing method according to any one of claims 1-3, wherein the method further comprises:
and after the power headroom is obtained through calculation, reporting a power headroom report containing the power headroom through a Media Access Control (MAC) control unit.
5. The method of claim 4, wherein the power headroom report occupies 2 bytes, and wherein the power headroom report comprises: a first report type parameter, a second report type parameter, a third report type parameter, and a power headroom parameter;
the first report type parameter occupies 3 bits and is used for identifying the report type reported by the MAC control unit; the second report type parameter occupies 2 bits and is used for further indicating the report type to be reported; the third report type parameter occupies 2 bits and is used for determining the source of the power headroom; the power headroom parameter is used to indicate the power headroom level.
6. A terminal, comprising:
an obtaining unit, configured to obtain, in one period of a physical downlink control channel PDCCH, a theoretical transmission power for transmitting an uplink synchronization signal and a theoretical transmission power for transmitting uplink data on a physical uplink shared channel PUSCH;
a calculating unit, configured to calculate, according to the theoretical transmission power for transmitting the uplink synchronization signal and the theoretical transmission power for transmitting the uplink data, a power margin when the uplink synchronization signal and the uplink data are transmitted simultaneously;
the computing unit is specifically configured to:
according to the theoretical transmitting power for transmitting the uplink synchronizing signal and the theoretical transmitting power for transmitting the uplink data, calculating the power margin when the uplink synchronizing signal and the uplink data are transmitted simultaneously by using the following formula:
wherein, PMAXFor the maximum transmit power, M, of the terminal UEPUSCH(i) Is the transmission bandwidth in the authorized PUSCH, the unit is a sub-band; pO_PUSCH(0) The expected received power of the transmission uplink data when the authorized PUSCH is dynamically scheduled for transmission; pO_PUSThe expected received power for the transmission uplink synchronization signal; alpha (0) is a cell-specific parameter configured by a network side during the transmission of the dynamically scheduled and authorized PUSCH; PL is the downlink path loss evaluated by the UE; deltaTF(i) Is a transport format offset value; f, (i) is a closed loop power control adjustment value during the transmission of the dynamically scheduled and authorized PUSCH; PH value1(i) A power margin for simultaneous transmission of the uplink synchronization signal and the uplink data; i is the period of PDCCH;
in order to transmit the theoretical transmission power of the uplink data,
and transmitting the theoretical transmitting power of the uplink synchronous signal.
7. A terminal, comprising:
at least one processor; and at least one memory communicatively coupled to the processor, wherein:
the memory stores program instructions executable by the processor, the processor calling the program instructions to perform the computing method of any of claims 1 to 5.
8. A non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the computing method of any one of claims 1 to 5.
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