CN108632969B - Power control method and terminal - Google Patents

Power control method and terminal Download PDF

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CN108632969B
CN108632969B CN201710184861.3A CN201710184861A CN108632969B CN 108632969 B CN108632969 B CN 108632969B CN 201710184861 A CN201710184861 A CN 201710184861A CN 108632969 B CN108632969 B CN 108632969B
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tti
tpc command
subframe
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CN108632969A (en
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张雯
夏树强
石靖
韩祥辉
梁春丽
张文峰
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a power control method and a terminal, wherein the method comprises the following steps: the method comprises the steps of determining a power correction amount of a designated channel on TTI # i, determining a power control adjustment state of the designated channel on TTI # i according to the power correction amount, and determining the power margin or the transmission power of a terminal on the designated channel according to the power control adjustment state by the terminal.

Description

Power control method and terminal
Technical Field
The present invention relates to the field of communications, and in particular, to a power control method and a terminal.
Background
In the related art, rapid development of mobile internet and internet of things has led to explosive growth of data traffic and wide rise of diverse and differentiated services. 5G as a new generation of mobile communication technology will support higher rates (Gbps), massive links (1M/Km2), ultra-low latency (1ms), higher reliability, hundreds of times energy efficiency increase, etc. to support new demand changes over 4G. The ultra-low time delay is used as a key index of the 5G technology, and directly influences the development of time delay limited services such as the Internet of vehicles, industrial automation, remote control, smart power grids and the like. A current series of standard studies on 5G latency reduction are advancing.
The reduction of Transmission Time Interval (TTI) is an important research direction for current delay reduction, and aims to reduce the TTI of 1ms in the related art to 0.5ms or even 1-2 OFDM symbols, so as to reduce the minimum scheduling Time by multiple times, thereby reducing the single Transmission delay by multiple times without changing the frame structure. 3GPP has also established discussions of short TTI latency reduction techniques.
In the related LTE technology, uplink transmitter power control plays a very important role, on one hand, to provide sufficient transmission energy per bit required for achieving QoS, and on the other hand, to minimize interference in the system and to maximize the battery life of the terminal. In the LTE power control method in the related art, the uplink transmit power may be regarded as the sum of two main terms, one is to obtain a basic open-loop operating point from a static or semi-static parameter sent by the eNB, and the other is to update a dynamic offset term per subframe. The dynamic offset portion, in turn, includes an MCS-based portion and a TPC command portion. The TPC command has two working modes: accumulate TPC commands and absolute TPC commands. Where the accumulated TPC commands are available for both PUSCH and PUCCH, and the absolute TPC commands are available only for PUSCH. In the accumulated TPC command, the transmission power formula comprises a power accumulated quantity, and the power accumulated quantity comprising the subframe is equal to the sum of the power accumulated quantity of the previous subframe and the power offset of the subframe.
For the problem of how to control the uplink power of short TTI in the related art, no effective solution exists at present.
Disclosure of Invention
The embodiment of the invention provides a power control method and a terminal, which are used for at least solving the problem of how to control the uplink power of short TTI in the related technology.
According to an embodiment of the present invention, there is provided a power control method including:
the communication node determines a power correction amount of a specified channel on TTI # i, and determines a power control adjustment state of the specified channel on TTI # i according to the power correction amount, wherein the TTI type corresponding to the TTI # i is one of M TTI types, M is an integer greater than 1, and i is an integer.
Optionally, the power headroom PHR and/or the transmission power of the designated channel on the TTI # i is determined according to the power control adjustment status.
Optionally, the designated channel is a physical uplink shared channel PUSCH or a physical uplink control channel PUCCH.
Optionally, the power control adjustment status of the designated channel at TTI # i is determined by the following formula:
f (i-1) + δ, where f (i) is the power control adjustment state of the specified channel in TTI # i, f (i-1) is the power control adjustment state of the specified channel in TTI # i-1, TTI # i-1 is the same TTI type as TTI # i, and δ is the power correction amount.
Optionally, the power control adjustment status of the designated channel at TTI # i is determined by the following formula:
f ' + δ, where f is a power control adjustment state of the specified channel in TTI # i, f ' is a power control adjustment state of a subframe preceding a subframe where the specified channel is located in a current TTI, or f ' is a power control adjustment state of a first specified TTI in a subframe preceding a subframe where the specified channel is located in a current TTI, the subframe where the current TTI is located is a subframe in long term evolution LTE, the first specified TTI is of the same type as a TTI corresponding to the current TTI, and δ is a power correction amount.
Optionally, one subframe is composed of a plurality of TTIs, and the plurality of TTIs have the same TTI type as the first specified TTI, where the first specified TTI is the last TTI in the plurality of TTIs, or the first specified TTI is the first TTI in the plurality of TTIs, or the first specified TTI is each TTI in the subframe.
Optionally, the power correction amount is obtained by a transmit power control TPC command that takes effect for the TTI # i; or, when there is no TPC command in effect for the TTI # i, the power correction amount is equal to 0.
Optionally, the power correction amount is equal to the sum of the power offsets corresponding to each TPC command effective for the TTI # i.
Optionally, the TPC command validated for the TTI # i includes at least one of:
first TPC command: receiving a downlink control information DCI format 3 or a TPC command in the DCI format 3A on a subframe # n-k, wherein the subframe # n is a subframe where the TTI # i is located, and n and k are integers;
second TPC command: scheduling UE to transmit a TPC command contained in uplink authorization of a PUSCH (physical uplink shared channel) on the TTI # i, or scheduling UE to receive the TPC command contained in downlink authorization of a PDSCH (physical downlink data channel), wherein the UE needs to transmit feedback information corresponding to the PDSCH on the PUCCH on the TTI # i;
third TPC command: TPC commands, except the first TPC command and the second TPC command, received on TTI # n1-k1, wherein TTI # n1 is the TTI where the TTI # i is located, the TTI types of the TTI # n1 and the TTI # n1-k1 are the first TTI type, the TTI type corresponding to the TPC command is the first TTI type, and the TTI length corresponding to the first TTI type is greater than the TTI length corresponding to the TTI type of the TTI # i;
fourth TPC command: a TPC command, except the first TPC command and the second TPC command, received at TTI # i-k2, wherein the TTI type corresponding to the TPC command is a second TTI type, and the TTI length corresponding to the second TTI type is smaller than or equal to the TTI length corresponding to the TTI type of TTI # i;
the first TTI type or the second TTI type is one of the M TTI types;
the UE is used for determining a power correction amount of the designated channel on the TTI # i, and determining a power control adjustment state of the designated channel on the TTI # i according to the power correction amount.
The first TTI type or the second TTI type is one of the M TTI types.
The UE is used for determining a power correction amount of the designated channel on the TTI # i, and determining a power control adjustment state of the designated channel on the TTI # i according to the power correction amount.
Optionally, the TTI type corresponding to the TPC command is preset or configured by the base station.
Optionally, the method further comprises at least one of:
when a second TPC command exists, the TPC command validated for the TTI # i only comprises the second TPC command;
when there is a first TPC command and other TPC commands, the TPC command validated for the TTI # i is only all or part of the other TPC commands, where the other TPC commands are at least one of a second TPC command, a third TPC command, and a fourth TPC command.
Optionally, when the TPC command other than the first TPC command and the second TPC command over the TTI # i-k2 is a plurality of TPC commands, the fourth TPC command is one of:
a TPC command that occurs earliest in the plurality of TPC commands;
for the latest occurring TPC command of the plurality of TPC commands;
for all of the plurality of TPC commands.
Optionally, the values of k, k1, or k2 include:
a preset value, or configured by the base station.
Optionally, the k1 or k2 is determined by a channel carrying the third TPC command or the fourth TPC command.
When the TTI # i is a second specified TTI on the TTI # n1, the TPC command that is in effect for the TTI # i includes only at least one of: the first TPC command, the second TPC command, the fourth TPC command; wherein the TTI # n1 comprises a plurality of TTIs with the same TTI type corresponding to the TTI # i, and the second specified TTI belongs to the plurality of TTIs with the same TTI type corresponding to the TTI # i. Alternatively, when the TTI # i is a second specified TTI on the TTI # n1, there is no TPC command in effect for the TTI # i. It should be added that in the above alternative embodiment, when the TTI # i is a non-second specified TTI on the TTI # n1, the TPC command validated for the TTI # i does not include the third TPC command.
Optionally, the second specified TTI is the first TTI or the last TTI or all TTIs of the plurality of TTIs.
Optionally, the M TTI types include at least one of: the TTI length is a TTI type of a subframe, wherein the subframe is a subframe in an LTE system; the TTI type is 2 symbols or 3 symbols in TTI length, wherein the symbols are single carrier frequency division multiple access SC-FDMA symbols in LTE; the TTI length is a TTI type of a time slot, wherein the time slot is a time slot in an LTE system; the TTI length is less than the TTI type of a subframe, wherein the subframe is a subframe in an LTE system.
According to an embodiment of the present invention, there is provided a terminal including: a processor for determining a power modifier for a given channel over TTI # i; the processor is further configured to determine a power control adjustment state of the specified channel in a TTI # i according to the power correction amount, where a TTI type corresponding to the TTI # i is one of M TTI types, M is an integer greater than 1, and i is an integer.
Optionally, the processor is further configured to determine a power headroom PHR and/or a transmission power of the designated channel on the TTI # i according to the power control adjustment status.
Optionally, the processor is further configured to determine a power control adjustment status of the channel at TTI # i by:
f (i-1) + δ, where f (i) is the power control adjustment state of the specified channel in TTI # i, f (i-1) is the power control adjustment state of the specified channel in TTI # i-1, TTI # i-1 is the same TTI type as TTI # i, and δ is a power correction amount.
Optionally, the processor is further configured to determine a power control adjustment status of the channel at TTI # i by:
f ' + δ, where f is a power control adjustment state of the specified channel in TTI # i, f ' is a power control adjustment state of a subframe preceding a subframe where the specified channel is located in a current TTI, or f ' is a power control adjustment state of a first specified TTI in a subframe preceding a subframe where the specified channel is located in a current TTI, the subframe where the current TTI is located is a subframe in long term evolution LTE, the first specified TTI is of the same type as a TTI corresponding to the current TTI, and δ is a power correction amount.
Optionally, one subframe is composed of a plurality of TTIs, and the plurality of TTIs have the same TTI type as the first specified TTI, where the first specified TTI is the last TTI in the plurality of TTIs, or the first specified TTI is the first TTI in the plurality of TTIs, or the first specified TTI is each TTI in the subframe.
Optionally, the power correction amount is obtained by a transmit power control TPC command that takes effect for the TTI # i; or
When there is no TPC command in effect for the TTI # i, the power correction amount is equal to 0.
Optionally, the TPC command validated for the TTI # i includes at least one of:
first TPC command: receiving a downlink control information DCI format 3 or a TPC command in the DCI format 3A on a subframe # n-k, wherein the subframe # n is a subframe where the TTI # i is located, and n and k are integers;
second TPC command: scheduling UE to transmit a TPC command contained in uplink authorization of a PUSCH (physical uplink shared channel) on the TTI # i, or scheduling UE to receive the TPC command contained in downlink authorization of a PDSCH (physical downlink data channel), wherein the UE needs to transmit feedback information corresponding to the PDSCH on the PUCCH on the TTI # i;
third TPC command: TPC commands, except the first TPC command and the second TPC command, received on TTI # n1-k1, wherein TTI # n1 is the TTI where the TTI # i is located, the TTI types of the TTI # n1 and the TTI # n1-k1 are the first TTI type, the TTI type corresponding to the TPC command is the first TTI type, and the TTI length corresponding to the first TTI type is greater than the TTI length corresponding to the TTI type of the TTI # i;
fourth TPC command: a TPC command, except the first TPC command and the second TPC command, received at TTI # i-k2, wherein the TTI type corresponding to the TPC command is a second TTI type, and the TTI length corresponding to the second TTI type is smaller than or equal to the TTI length corresponding to the TTI type of TTI # i;
the first TTI type or the second TTI type is one of the M TTI types;
the UE is used for determining a power correction amount of the designated channel on the TTI # i, and determining a power control adjustment state of the designated channel on the TTI # i according to the power correction amount. The first TTI type or the second TTI type is one of the M TTI types.
The UE is used for determining a power correction amount of the designated channel on the TTI # i, and determining a power control adjustment state of the designated channel on the TTI # i according to the power correction amount.
According to another embodiment of the present invention, there is also provided a storage medium, characterized in that the storage medium includes a stored program, wherein the program executes the method described in any one of the above embodiments.
According to the invention, the power correction quantity of the designated channel on the TTI # i is determined, the power control adjustment state of the designated channel on the TTI # i is determined according to the power correction quantity, and the terminal determines the power margin or the transmission power of the terminal on the designated channel according to the power control adjustment state, so that the problem that a technical scheme for controlling the uplink power of short TTI is lacked in the related art is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flow chart of a method of power control according to an embodiment of the present invention;
fig. 2 is a diagram of SC-FDMA symbol coincidence according to a first preferred embodiment of the present invention;
FIG. 3 is a diagram of a first subframe according to a first preferred embodiment of the present invention;
fig. 4 is a diagram of a subframe according to the first preferred embodiment of the present invention.
Detailed Description
Example one
The embodiment of the application provides a mobile communication network (including but not limited to a 5G mobile communication network), and the network architecture of the network can comprise a network side device (such as a base station) and a terminal. In this embodiment, a power control method capable of operating on the network architecture is provided, and it should be noted that the operating environment of the information transmission method provided in this embodiment is not limited to the network architecture.
In the present embodiment, a power control method for a terminal operating in the network architecture is provided, and it is to be added that the method may also be applied to a communication node, where the communication node may be a terminal of the network architecture.
In the present specification, "TTI # i" is used to indicate a TTI and is a format indicating a TTI, and "subframe # i" is also used to indicate a subframe and is a format indicating a subframe.
Fig. 1 is a flowchart of a power control method according to an embodiment of the present invention, and as shown in fig. 1, the flowchart includes the following steps:
step S102, determining a power correction quantity of the specified channel on TTI # i;
and step S104, determining the power control adjustment state of the specified channel in TTI # i according to the power correction amount. The TTI type corresponding to the TTI # i is one of M TTI types, wherein M is an integer greater than 1, and i is an integer.
According to the invention, the power correction quantity of the designated channel on the TTI # i is determined, the power control adjustment state of the designated channel on the TTI # i is determined according to the power correction quantity, and the terminal determines the power margin or the transmission power of the terminal on the designated channel according to the power control adjustment state, so that the problem that a technical scheme for controlling the uplink power of short TTI is lacked in the related art is solved.
Optionally, the power headroom PHR and/or the transmission power of the designated channel on the TTI # i is determined according to the power control adjustment status.
Optionally, the designated channel is a physical uplink shared channel PUSCH or a physical uplink control channel PUCCH.
Optionally, the power control adjustment status of the designated channel at TTI # i is determined by the following formula:
f (i-1) + δ, where f (i) is the power control adjustment state of the specified channel in TTI # i, f (i-1) is the power control adjustment state of the specified channel in TTI # i-1, TTI # i-1 is the same TTI type as TTI # i, and δ is the power correction amount.
Optionally, the power control adjustment status of the designated channel at TTI # i is determined by the following formula:
f ' + δ, where f is a power control adjustment state of the specified channel in TTI # i, f ' is a power control adjustment state of a subframe preceding a subframe where the specified channel is located in a current TTI, or f ' is a power control adjustment state of a first specified TTI in a subframe preceding a subframe where the specified channel is located in a current TTI, the subframe where the current TTI is located is a subframe in long term evolution LTE, the first specified TTI is of the same type as a TTI corresponding to the current TTI, and δ is a power correction amount.
Optionally, one subframe is composed of a plurality of TTIs, and the plurality of TTIs have the same TTI type as the first specified TTI, where the first specified TTI is the last TTI in the plurality of TTIs, or the first specified TTI is the first TTI in the plurality of TTIs, or the first specified TTI is each TTI in the subframe.
Optionally, the power correction amount is obtained by a transmit power control TPC command that takes effect for the TTI # i; or, when there is no TPC command in effect for the TTI # i, the power correction amount is equal to 0.
Optionally, the power correction amount is equal to the sum of the power offsets corresponding to each TPC command effective for the TTI # i.
Optionally, the TPC command validated for the TTI # i includes at least one of:
first TPC command: receiving a downlink control information DCI format 3 or a TPC command in the DCI format 3A on a subframe # n-k, wherein the subframe # n is a subframe where the TTI # i is located, and n and k are integers;
second TPC command: scheduling UE to transmit a TPC command contained in uplink authorization of a PUSCH (physical uplink shared channel) on the TTI # i, or scheduling UE to receive the TPC command contained in downlink authorization of a PDSCH (physical downlink data channel), wherein the UE needs to transmit feedback information corresponding to the PDSCH on the PUCCH on the TTI # i;
third TPC command: TPC commands, except the first TPC command and the second TPC command, received on TTI # n1-k1, wherein TTI # n1 is the TTI where the TTI # i is located, the TTI types of the TTI # n1 and the TTI # n1-k1 are the first TTI type, the TTI type corresponding to the TPC command is the first TTI type, and the TTI length corresponding to the first TTI type is greater than the TTI length corresponding to the TTI type of the TTI # i;
fourth TPC command: a TPC command, except the first TPC command and the second TPC command, received at TTI # i-k2, wherein the TTI type corresponding to the TPC command is a second TTI type, and the TTI length corresponding to the second TTI type is smaller than or equal to the TTI length corresponding to the TTI type of TTI # i;
the first TTI type or the second TTI type is one of the M TTI types;
the UE is used for determining a power correction amount of the designated channel on the TTI # i, and determining a power control adjustment state of the designated channel on the TTI # i according to the power correction amount.
It should be noted that the first TTI type or the second TTI type is one of the M TTI types, the TTI # n1 is a long TTI, which is referred to as a first TTI type in this document, and the first TTI type includes a plurality of short TTIs, i.e., TTI # i.
The UE is configured to determine a power correction amount of the designated channel in TTI # i, and determine a power control adjustment state of the designated channel in TTI # i according to the power correction amount, where the UE is the UE executing the method flow in fig. 1.
Optionally, the TTI type corresponding to the TPC command is preset or configured by the base station.
Optionally, the method further comprises at least one of:
when a second TPC command exists, the TPC command validated for the TTI # i only comprises the second TPC command;
when there is a first TPC command and other TPC commands, the TPC command validated for the TTI # i is only all or part of the other TPC commands, where the other TPC commands are at least one of a second TPC command, a third TPC command, and a fourth TPC command.
Optionally, when the TPC command other than the first TPC command and the second TPC command over the TTI # i-k2 is a plurality of TPC commands, the fourth TPC command is one of:
a TPC command that occurs earliest in the plurality of TPC commands;
for the latest occurring TPC command of the plurality of TPC commands;
for all of the plurality of TPC commands.
Optionally, the values of k, k1, or k2 include:
a preset value, or configured by the base station.
Optionally, the k1 or k2 is determined by a channel carrying the third TPC command or the fourth TPC command.
Optionally, when the TTI # i is a second specified TTI on the TTI # n1, the TPC command effective for the TTI # i includes only at least one of: the first TPC command, the second TPC command, the fourth TPC command; wherein the TTI # n1 comprises a plurality of TTIs with the same TTI type corresponding to the TTI # i, and the second specified TTI belongs to the plurality of TTIs with the same TTI type corresponding to the TTI # i. Alternatively, when the TTI # i is a second specified TTI on the TTI # n1, there is no TPC command in effect for the TTI # i. Note that TTI # n1 is a long TTI including a plurality of short TTIs, the short TTI includes a second specified TTI, and TTI # i may be a short TTI of TTI # n 1.
Optionally, the second specified TTI is the first TTI or the last TTI or all TTIs of the plurality of TTIs.
Optionally, the M TTI types include at least one of: the TTI length is a TTI type of a subframe, wherein the subframe is a subframe in an LTE system; the TTI type is 2 symbols or 3 symbols in TTI length, wherein the symbols are single carrier frequency division multiple access SC-FDMA symbols in LTE; the TTI length is a TTI type of a time slot, wherein the time slot is a time slot in an LTE system; the TTI length is less than the TTI type of a subframe, wherein the subframe is a subframe in an LTE system.
The following detailed description will be given with reference to preferred embodiments of the present invention.
Preferred embodiment 1
The method for controlling the uplink power of the LTE system supporting short TTI is provided in this embodiment, and the method for controlling the uplink power provided in this embodiment may be used for the PUSCH or the PUCCH. The PUSCH is described below as an example.
In this embodiment, a power control scheme when a PUSCH with a TTI length of 1ms and a PUSCH with a TTI length of 2 or 3 symbols are dynamically switched may occur in the system is given.
In LTE systems that support short TTIs, the TTI length may be less than one subframe. That is, in an LTE system supporting short TTIs, there are multiple TTI types. For example, one TTI type is a TTI type where the TTI is one slot in length, i.e., the normal CP next 7 SC-FDMA symbols. Alternatively, the length of the TTI may be a TTI type of 2 or 3 SC-FDMA symbols, and in the following description of the embodiment, an sTTI with a TTI length of 2 or 3 symbols is collectively referred to as an sTTI with a TTI length of 2 symbols. The existing subframe of length 1ms is also a TTI type. Here, both uplink and/or downlink may comprise a plurality of TTI types. In the invention, the TTI with the TTI length smaller than one subframe is also called as sTTI, and the PUSCH on the sTTI is also called as sUSCH. The DCI scheduling the sPUSCH is also called sdic, and the sdic may be transmitted on PDCCH or sPDCCH. When the PDCCH occupies 1-3 symbols, the sDCI occupies 1 sTTI; when PDCCH occupies 4 symbols, the dci occupies two sTTI. Fig. 2 is a diagram illustrating SC-FDMA symbol coincidence according to a first preferred embodiment of the present invention, as shown in fig. 2, each small square represents one SC-FDMA symbol, and one subframe is divided into 6 short TTIs. In general, the TTI of 2 or 3 symbols in fig. 2 is referred to as a TTI of 2 symbols.
In the LTE system supporting short TTI, PUSCH may be dynamically switched with sPUSCH, for example, PUSCH of 1ms is scheduled in subframe # n, and PUSCH of 2 symbols is scheduled in subframe # n + 1.
In the accumulative power control mode, the transmission power of the PUSCH is obtained from power parameters configured by several RRC signaling and a power control adjustment state, for example, for the existing LTE system, the transmission power of the PUSCH is:
Figure BDA0001254550180000131
wherein f isc(i) Adjusting state for power control of subframe i, fc(i)＝fc(i-1)+δPUSCH,c(i-KPUSCH)，fc(i-1) Power control adjustment State on subframe i-1, δPUSCH,c(i-KPUSCH) For sub-frames i-KPUSCHThe amount of power correction indicated in the TPC command sent above.
In this embodiment, the TTI type corresponding to the TPC command is preset or configured. For example, it is assumed that the eNB configures downlink and uplink pairing to adopt a 2-2 structure through RRC signaling, that is, the downlink adopts an sTTI with a TTI length of 2 symbols, and the corresponding uplink also adopts an sTTI with a TTI length of 2 symbols. For example, the dci with 2 symbols schedules the sPUSCH with 2 symbols, and the TTI type corresponding to the TPC command in the uplink grant scheduling for the sPUSCH is the TTI type with TTI length of 2 symbols. For the existing scheduling, for example, the PDCCH schedules the PUSCH of 1ms, the TTI type corresponding to the TPC command in the uplink grant on the PDCCH is an existing subframe, which is referred to as a subframe type, for example.
In the following description of the present embodiment, it is assumed that there are two TTI types for both uplink and downlink: TTI type and subframe type of length 2 symbols.
For the PUSCH, the TTI length is 1ms, and the power control adjustment state in TTI # i or subframe # i is:
f(i)＝f(i-1)+δ
wherein f (i) is the power control adjustment state of the PUSCH in the sub-frame # i, f (i-1) is the power adjustment state of the PUSCH in the sub-frame # i-1, and delta is the power correction amount. When there is no TPC command in effect for the TTI # i, the power correction amount is equal to 0.
Optionally, the power correction δ is obtained by a TPC command in an uplink grant for scheduling the UE to transmit the PUSCH in the subframe # i, for example, the eNB transmits the uplink grant in the subframe i-4, the uplink grant schedules the UE to transmit the PUSCH in the subframe i, and then the power correction δ is obtained according to the TPC command in the uplink grant.
Optionally, the power correction δ is obtained from a TPC command included in DCI format 3 or DCIformat 3A in subframe # i-k, where k is a preset value. For example, in FDD, k is 4.DCI format 3 or DCI format 3A is a DCI format in the conventional LTE technology.
Optionally, the power correction δ is derived from a TPC command of TTI type having TTI length of 2 symbols on sub-frames # i-k2, where k2 is an integer. For example, for subframe # i, if an uplink grant for scheduling the sPUSCH sent by the eNB is received in subframe # i-k and the uplink grant includes a TPC command, the power correction δ is obtained from the TPC command. Optionally, when there are uplink grants for scheduling the sPUSCH sent by multiple enbs on the subframe # i-k2 and each uplink grant includes a TPC command, the power correction δ is obtained from the uplink grant for the first scheduling sPUSCH sent by the eNB on the subframe # i-k; or the power correction quantity delta is obtained by uplink authorization of the last scheduling sUSCH sent by the eNB on the subframe # i-k; or, the power correction δ is obtained from the uplink grants of all scheduling sPUSCH sent by the eNB in the subframe # i-k, for example, the sum of the power offsets corresponding to the TPC commands of the uplink grants of all scheduling sPUSCH. Optionally, the power correction δ is derived from one or more of the above TPC commands. Optionally, when the TPC command includes a TPC command in an uplink grant for scheduling the UE to transmit the PUSCH in the subframe # i, the power correction amount δ is obtained only by the TPC command. Optionally, when the TPC command includes the DCI format 3 or the TPC command and other TPC commands included in the DCI format 3A, in this case, the power correction amount δ is obtained by some or all of the other TPC commands without considering the TPC commands included in the DCI format 3 or the DCI format 3A.
Fig. 3 is a first subframe diagram according to a first preferred embodiment of the present invention, and as shown in fig. 3, assuming that there is an uplink grant for scheduling the UE to transmit the sPUSCH over the sTTI #3 on the subframe #1 on the subframe #0, the power control adjustment status on the subframe #4 is equal to the sum of the power control adjustment status on the subframe #3 and the power offset corresponding to the TPC command.
For the sUSCH, the TTI length is 2 or 3 symbols, and the power control adjustment state in TTI # i is as follows:
f(i)＝f(i-1)+δ
wherein f (i) is the power control adjustment state of PUSCH in sTTI # i, f (i-1) is the power adjustment state of PUSCH in sTTI # i-1, and delta is the power correction amount. Here, i and i-1 are indices of sTTI, and each subframe is composed of 6 sTTI. Here, it should be noted that, regardless of whether there is PUSCH or sPUSCH on a subframe or no data transmission, each subframe is divided into a plurality of sttis, for example, 6 sttis, each sTTI has a corresponding index, and the indexes of the sttis sequentially increased according to a time sequence.
Optionally, the power correction δ is obtained by scheduling the UE to send the TPC command in the uplink grant of the sPUSCH over sTTI # i, for example, if the eNB sends the uplink grant over sTTI # i-4, and the uplink grant schedules the UE to send the sPUSCH over sTTI # i, then the power correction δ is obtained according to the TPC command in the uplink grant.
Optionally, the power correction δ is obtained from a TPC command included in DCI format 3 or DCIformat 3A in subframe # n-k, where k is a preset value. The subframe # n is a subframe where the sTTI # i is located. For example, in FDD, k is 4.DCI format 3 or DCIformat 3A is a DCI format in the existing LTE technology.
Alternatively, the power correction δ is derived from the subframe type TPC command. For sTTI # i, the power correction δ is obtained from the TPC command included in the uplink grant scheduling PUSCH on subframe # n-k. Here, the subframe # n is a subframe in which the sTTI # i is located, and k is an integer, for example, 1. Fig. 4 is a diagram of a subframe according to the first preferred embodiment of the present invention, as shown in fig. 4, a subframe #0 transmits an uplink grant for scheduling PUSCH on the subframe #4, where the uplink grant includes a TPC command, and then the power control adjustment state of sTTI #0 on the subframe #1 is equal to the sum of the power control adjustment state on the subframe #0 and the power offset corresponding to the TPC command. Alternatively, the power correction δ is derived from the TPC command included in the PDCCH scheduling PUSCH on sub-frame # n-k 1. Optionally, the power correction δ is obtained from a TPC command included in an EPDCCH of the scheduled PUSCH on the subframe # n-k2, where k1 and k2 may be the same or different, for example, k1 ═ 1, and k2 ═ 2.
Alternatively, when the sTTI # i is a specified sTTI in one subframe, the power correction amount δ is obtained from a TPC command corresponding to a PUSCH of 1 ms. Here, the designated sTTI may be the first sTTI, or the last sTTI, or each sTTI of one subframe. Preferably, when the sTTI is the first sTTI of a subframe, the power correction amount δ is obtained from the TPC command included in the PDCCH scheduling PUSCH on the subframe # n-k 1. Preferably, when the sTTI is the last sTTI of a subframe, the power correction amount δ is obtained from the TPC command included in the EPDCCH of the scheduled PUSCH on the subframe # n-k 2.
Optionally, the power correction δ is derived from one or more of the above TPC commands. Optionally, when the TPC command includes a TPC command in an uplink grant for scheduling the UE to transmit the PUSCH in the subframe # i, the power correction amount δ is obtained only by the TPC command. Optionally, when the TPC command includes the TPC command and other TPC commands included in the DCI format 3 or DCIformat 3A, in this case, the power correction amount δ is obtained from some or all of the other TPC commands without considering the TPC commands included in the DCI format 3 or DCIformat 3A.
The method in this embodiment may also be used for PUCCH. For the PUCCH, the eNB sends a downlink grant to schedule the UE to receive the PDSCH, and the UE sends ACK/NACK fed back to the PDSCH on the PUCCH in TTI # i, wherein the downlink grant comprises a TPC command aiming at the PUCCH. The whole process is similar to the above and is not described in detail.
The method in this embodiment may also be used in a case where the TTI type for sending the uplink grant and the PUSCH type scheduled by the uplink grant are different in the system, for example, it is assumed that the eNB configures, through RRC signaling, the sps sch with the dci scheduling 7 symbols of 2 or 3 symbols, and the downlink and uplink pairings adopt a 2-7 structure.
The method in this embodiment may also be used for dynamic switching of PUSCHs of multiple TTI types, which is similar to the above processing method and is not described again.
Preferred embodiment 2
The scenario in this embodiment is similar to that in embodiment 1, except that in this embodiment, the power of the sPUSCH in one subframe is not changed. The power control adjustment state over one TTI can be written as:
f＝f′+δ
wherein f is the power control adjustment state of the channel in the current TTI, f 'is the power adjustment state of the channel in the previous subframe of the subframe where the current TTI is located, or f' is the power adjustment state of the specified TTI in the previous subframe of the subframe where the current TTI is located, the subframe is a subframe in LTE, the specified TTI is the same as the TTI type corresponding to the current TTI, and δ is the power correction amount. Here, the specified TTI is the last TTI in the subframe preceding the subframe where the current TTI is located, or is the first TTI, or is every TTI.
The power correction amount δ is determined in a similar manner to the preferred embodiment 1. The difference is that the power correction δ is obtained from the TPC command corresponding to the sTTI, where the TPC command corresponding to the sTTI may be sent by a dedicated DCI and may not include the scheduling information of the UE, for example, there are two levels of DCI in a subframe, the first level of DCI may include the TPC command, and the second level may include the scheduling information of the UE, where the TPC command is used to adjust the power control adjustment state of the sTTI in the next subframe.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
Example two
According to an embodiment of the present invention, there is provided a terminal including: a processor for determining a power modifier for a given channel over TTI # i; the processor is further configured to determine a power control adjustment state of the specified channel in a TTI # i according to the power correction amount, where a TTI type corresponding to the TTI # i is one of M TTI types, M is an integer greater than 1, and i is an integer.
Optionally, the processor is further configured to determine a power headroom PHR and/or a transmission power of the designated channel on the TTI # i according to the power control adjustment status.
Optionally, the processor is further configured to determine a power control adjustment status of the channel at TTI # i by:
f (i-1) + δ, where f (i) is the power control adjustment state of the specified channel in TTI # i, f (i-1) is the power control adjustment state of the specified channel in TTI # i-1, TTI # i-1 is the same TTI type as TTI # i, and δ is a power correction amount.
Optionally, the processor is further configured to determine a power control adjustment status of the channel at TTI # i by:
f ' + δ, where f is a power control adjustment state of the specified channel in TTI # i, f ' is a power control adjustment state of a subframe preceding a subframe where the specified channel is located in a current TTI, or f ' is a power control adjustment state of a first specified TTI in a subframe preceding a subframe where the specified channel is located in a current TTI, the subframe where the current TTI is located is a subframe in long term evolution LTE, the first specified TTI is of the same type as a TTI corresponding to the current TTI, and δ is a power correction amount.
Optionally, one subframe is composed of a plurality of TTIs, and the plurality of TTIs have the same TTI type as the first specified TTI, where the first specified TTI is the last TTI in the plurality of TTIs, or the first specified TTI is the first TTI in the plurality of TTIs, or the first specified TTI is each TTI in the subframe.
Optionally, the power correction amount is obtained by a transmit power control TPC command that takes effect for the TTI # i; or
When there is no TPC command in effect for the TTI # i, the power correction amount is equal to 0.
Optionally, the TPC command validated for the TTI # i includes at least one of:
first TPC command: receiving a downlink control information DCI format 3 or a TPC command in the DCI format 3A on a subframe # n-k, wherein the subframe # n is a subframe where the TTI # i is located, and n and k are integers;
second TPC command: scheduling UE to transmit a TPC command contained in uplink authorization of a PUSCH (physical uplink shared channel) on the TTI # i, or scheduling UE to receive the TPC command contained in downlink authorization of a PDSCH (physical downlink data channel), wherein the UE needs to transmit feedback information corresponding to the PDSCH on the PUCCH on the TTI # i;
third TPC command: TPC commands, except the first TPC command and the second TPC command, received on TTI # n1-k1, wherein TTI # n1 is the TTI where the TTI # i is located, the TTI types of the TTI # n1 and the TTI # n1-k1 are the first TTI type, the TTI type corresponding to the TPC command is the first TTI type, and the TTI length corresponding to the first TTI type is greater than the TTI length corresponding to the TTI type of the TTI # i;
fourth TPC command: a TPC command, except the first TPC command and the second TPC command, received at TTI # i-k2, wherein the TTI type corresponding to the TPC command is a second TTI type, and the TTI length corresponding to the second TTI type is smaller than or equal to the TTI length corresponding to the TTI type of TTI # i;
the first TTI type or the second TTI type is one of the M TTI types;
the UE is used for determining a power correction amount of the designated channel on the TTI # i, and determining a power control adjustment state of the designated channel on the TTI # i according to the power correction amount. The first TTI type or the second TTI type is one of the M TTI types.
The UE is used for determining a power correction amount of the designated channel on the TTI # i, and determining a power control adjustment state of the designated channel on the TTI # i according to the power correction amount.
EXAMPLE III
According to another embodiment of the present invention, there is also provided a storage medium, characterized in that the storage medium includes a stored program, wherein the program executes the method described in any one of the above embodiments.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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 (21)

1. A method of power control, comprising:
the communication node determines a power correction quantity of a specified channel on TTI # i, and determines a power control adjustment state of the specified channel on TTI # i according to the power correction quantity, wherein the TTI type corresponding to the TTI # i is one of M TTI types, M is an integer greater than 1, and i is an integer;
the power correction is obtained by a Transmission Power Control (TPC) command which takes effect on the TTI # i; or when there is no TPC command in effect for the TTI # i, the power correction amount is equal to 0; the TPC command validated for the TTI # i comprises: first TPC command: and receiving a downlink control information DCI format 3 or a TPC command in the DCI format 3A on a subframe # n-k, wherein the subframe # n is a subframe where the TTI # i is located, and n and k are integers.
2. The method of claim 1, wherein a Power Headroom (PHR) and/or a transmission power of the designated channel over the TTI # i is determined according to the power control adjustment status.
3. The method according to claim 1, wherein the specified channel is a Physical Uplink Shared Channel (PUSCH) or a Physical Uplink Control Channel (PUCCH).
4. The method of claim 1, wherein the power control adjustment status of the designated channel at TTI # i is determined by one of the following formulas:
f (i-1) + δ, where f (i) is the power control adjustment state of the specified channel in TTI # i, f (i-1) is the power control adjustment state of the specified channel in TTI # i-1, TTI # i-1 is the same as the TTI type corresponding to TTI # i, and δ is the power correction amount;
f ' + δ, where f is a power control adjustment state of the specified channel in TTI # i, f ' is a power control adjustment state of a subframe preceding a subframe where the specified channel is located in a current TTI, or f ' is a power control adjustment state of a first specified TTI in a subframe preceding a subframe where the specified channel is located in a current TTI, the subframe where the current TTI is located is a subframe in long term evolution LTE, the first specified TTI is of the same type as a TTI corresponding to the current TTI, and δ is a power correction amount.
5. The method of claim 4, wherein one of the subframes is composed of a plurality of TTIs, and wherein the plurality of TTIs are of the same type as the TTI corresponding to the first specified TTI, wherein the first specified TTI is a last TTI of the plurality of TTIs, or wherein the first specified TTI is a first TTI of the plurality of TTIs, or wherein the first specified TTI is each TTI of the subframes.
6. The method of claim 1, comprising:
the power correction is equal to the sum of the power offsets corresponding to each TPC command in effect for the TTI # i.
7. The method of claim 6, wherein the TPC command that takes effect for the TTI # i further comprises at least one of:
second TPC command: scheduling UE to transmit a TPC command contained in uplink authorization of a PUSCH (physical uplink shared channel) on the TTI # i, or scheduling UE to receive the TPC command contained in downlink authorization of a PDSCH (physical downlink data channel), wherein the UE needs to transmit feedback information corresponding to the PDSCH on the PUCCH on the TTI # i;
third TPC command: TPC commands, except the first TPC command and the second TPC command, received on TTI # n1-k1, wherein TTI # n1 is the TTI where the TTI # i is located, the TTI types corresponding to the TTI # n1 and the TTI # n1-k1 are the first TTI type, the TTI type corresponding to the TPC command is the first TTI type, and the TTI length corresponding to the first TTI type is greater than the TTI length corresponding to the TTI type of the TTI # i;
fourth TPC command: a TPC command, except the first TPC command and the second TPC command, received at TTI # i-k2, wherein the TTI type corresponding to the TPC command is a second TTI type, and the TTI length corresponding to the second TTI type is smaller than or equal to the TTI length corresponding to the TTI type of TTI # i;
the first TTI type or the second TTI type is one of the M TTI types;
wherein the UE is one of the communication nodes.
8. The method of claim 7, wherein the TTI type corresponding to the TPC command is predetermined or base station configured.
9. The method of claim 7, further comprising at least one of:
when the second TPC command is present, the TPC command in effect for the TTI # i comprises only the second TPC command;
when the first TPC command and other TPC commands exist, the TPC command validated for the TTI # i is only all or part of the other TPC commands, wherein the other TPC commands are at least one of a second TPC command, a third TPC command and a fourth TPC command.
10. The method of claim 7,
when the TPC command on the TTI # i-k2 other than the first TPC command and the second TPC command is a plurality of TPC commands, the fourth TPC command is one of:
a TPC command that occurs earliest in the plurality of TPC commands;
for the latest occurring TPC command of the plurality of TPC commands;
for all of the plurality of TPC commands.
11. The method of claim 7, wherein the k, k1, or k2 values comprise:
a preset value, or configured by the base station.
12. The method of claim 11, comprising at least one of:
the k1 is determined by the channel carrying the third TPC command;
the k2 is determined by the channel carrying the fourth TPC command.
13. The method of claim 7, wherein the method comprises one of:
when the TTI # i is a second specified TTI on the TTI # n1, the TPC command that is in effect for the TTI # i includes only at least one of: the first TPC command, the second TPC command, the fourth TPC command; wherein the TTI # n1 comprises a plurality of TTIs of the same TTI type corresponding to the TTI # i, and the second specified TTI belongs to the plurality of TTIs of the same TTI type corresponding to the TTI # i;
when the TTI # i is the second specified TTI on the TTI # n1, there is no TPC command in effect for the TTI # i.
14. The method of claim 13, wherein the second specified TTI is a first TTI or a last TTI or all TTIs of the plurality of TTIs.
15. The method of claim 1, wherein the M TTI types include at least one of:
the TTI length is a TTI type of a subframe, wherein the subframe is a subframe in an LTE system;
the TTI type is 2 symbols or 3 symbols in TTI length, wherein the symbols are single carrier frequency division multiple access SC-FDMA symbols in LTE;
the TTI length is a TTI type of a time slot, wherein the time slot is a time slot in an LTE system;
the TTI length is less than the TTI type of a subframe, wherein the subframe is a subframe in an LTE system.
16. A terminal, comprising:
a processor for determining a power modifier for a given channel over TTI # i;
the processor is further configured to determine a power control adjustment state of the specified channel in a TTI # i according to the power correction amount, where a TTI type corresponding to the TTI # i is one of M TTI types, M is an integer greater than 1, and i is an integer;
the power correction is obtained by a Transmission Power Control (TPC) command which takes effect on the TTI # i; or when there is no TPC command in effect for the TTI # i, the power correction amount is equal to 0; the TPC command validated for the TTI # i comprises: first TPC command: and receiving a downlink control information DCI format 3 or a TPC command in the DCI format 3A on a subframe # n-k, wherein the subframe # n is a subframe where the TTI # i is located, and n and k are integers.
17. The terminal of claim 16, wherein the processor is further configured to determine a Power Headroom (PHR) and/or a transmission power of the designated channel at the TTI # i according to the power control adjustment status.
18. The terminal of claim 16, wherein the processor is further configured to determine the power control adjustment status of the channel at TTI # i by one of the following formulas:
f (i-1) + δ, wherein f (i) is the power control adjustment state of the designated channel in TTI # i, f (i-1) is the power control adjustment state of the designated channel in TTI # i-1, TTI # i-1 is the same TTI type as TTI # i, and δ is a power correction amount;
f ' + δ, where f is a power control adjustment state of the specified channel in TTI # i, f ' is a power control adjustment state of a subframe preceding a subframe where the specified channel is located in a current TTI, or f ' is a power control adjustment state of a first specified TTI in a subframe preceding a subframe where the specified channel is located in a current TTI, the subframe where the current TTI is located is a subframe in long term evolution LTE, the first specified TTI is of the same type as a TTI corresponding to the current TTI, and δ is a power correction amount.
19. The terminal of claim 18, wherein one of the subframes is composed of a plurality of TTIs, and wherein the plurality of TTIs are of the same TTI type as the first specified TTI, wherein the first specified TTI is a last TTI of the plurality of TTIs, wherein the first specified TTI is a first TTI of the plurality of TTIs, and wherein the first specified TTI is every TTI of the subframe.
20. The terminal of claim 16, wherein the TPC command effective for the TTI # i further comprises at least one of:
second TPC command: scheduling UE to transmit a TPC command contained in uplink authorization of a PUSCH (physical uplink shared channel) on the TTI # i, or scheduling UE to receive the TPC command contained in downlink authorization of a PDSCH (physical downlink data channel), wherein the UE needs to transmit feedback information corresponding to the PDSCH on the PUCCH on the TTI # i;
third TPC command: TPC commands, except the first TPC command and the second TPC command, received on TTI # n1-k1, wherein TTI # n1 is the TTI where the TTI # i is located, the TTI types of the TTI # n1 and the TTI # n1-k1 are the first TTI type, the TTI type corresponding to the TPC command is the first TTI type, and the TTI length corresponding to the first TTI type is greater than the TTI length corresponding to the TTI type of the TTI # i;
fourth TPC command: a TPC command, except the first TPC command and the second TPC command, received at TTI # i-k2, wherein the TTI type corresponding to the TPC command is a second TTI type, and the TTI length corresponding to the second TTI type is smaller than or equal to the TTI length corresponding to the TTI type of TTI # i;
the first TTI type or the second TTI type is one of the M TTI types;
the UE is used for power correction of the specified channel in TTI # i, and determining the power control adjustment state of the specified channel in TTI # i according to the power correction.
21. A storage medium, comprising a stored program, wherein the program when executed performs the method of any one of claims 1 to 15.
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