TWI491279B - And a method and apparatus for reporting a power margin of a user terminal device - Google Patents

Description

Method and device for reporting power headroom of user terminal equipment

The present invention relates to a Power Headroom Report (PHR), and more particularly to a method and apparatus for reporting a power headroom of a user terminal device in a communication network employing carrier aggregation techniques.

The power headroom (PH) report of the uplink system may provide power related information of the user terminal equipment to the base station to assist the base station in resource scheduling. In an LTE (Long Term Evolution) system, the information included in the power headroom report is the difference between the nominal maximum transmit power of the user terminal equipment and the estimated transmit power of the uplink shared channel.

1a and 1b are schematic diagrams of a MAC PDU (Media Access Control Protocol Data Unit) subheader and a power headroom MAC control element for reporting power headroom in an LTE system, respectively. The subheader shown in Figure 1a has a length of 1 byte. R is a reserved field (field), set to "0"; E is an extension field to indicate whether there are more fields in the MAC header; LCID is the logical channel ID (Logical Channel ID) field a logical channel entity for identifying a subsequent MAC payload. The LCID of 5 bits corresponds to 32 indexes, and a part of the index (01011 to 11001) is a reserved index, that is, has not been use. The power headroom MAC control unit shown in Figure 1b has a length of 1 byte. R is the reserved field, set to "0"; PH is the 6-bit power margin field to indicate the power headroom. In LTE, when reporting the power headroom, a subheader corresponds to one The power headroom MAC control unit, i.e., the sub-header in Figure 1a, identifies the power headroom MAC control unit of Figure 1b via the LCID field.

The inventors of the present invention have realized that in an LTE-A (LTE-A) system incorporating carrier aggregation, the power headroom reporting mechanism used by LTE cannot satisfy the requirements of a plurality of component carriers. In a system of carrier aggregation LTE-A, a base station and a user terminal device can support data transmission on multiple component carriers. Since the channel conditions corresponding to the respective component carriers are different and the power consumption of each component carrier is independently controlled, the power headroom of each component carrier may be different, so a user terminal device needs to report the power headroom information of each component carrier. To the base station. The power headroom information for multiple component carriers may be transmitted on respective component carriers, on only one component carrier, or in other manners. In addition, if one component carrier is set as the primary carrier in multiple component carriers, the channel power margin of the primary carrier and the channel power of the control channel are also reported to the base station. The existing power headroom reporting mechanism cannot meet the above multiple requirements, that is, the power headroom of the multi-component carrier cannot be reported.

Based on the above understanding of the prior art and related issues, it would be very important to be able to report the power headroom of multiple component carriers to the base station. In addition, it is also very meaningful to implement power headroom reporting for multiple component carriers with minimal changes to the existing LTE power headroom reporting mechanism.

In order to better solve the above considerations, according to an embodiment of the first aspect of the present invention, there is provided a method for reporting power headroom related information to a network device in a user terminal device. The transmission channel of the user equipment is configured with a plurality of component carriers, and the power headroom related information indicates a channel power margin of the at least one component carrier of the user equipment equipment. The method comprises the steps of: - obtaining the power head related information; - determining a header and at least one power headroom control unit based on the power headroom related information, the at least one power headroom control unit comprising Deriving power head related information, the header including information indicating at least one bit of the first transmission format of the power headroom related information in the at least one power headroom control unit and/or the at least a power headroom control unit includes information indicating at least one bit of the second transmission format of the power headroom related information in the at least one power headroom control unit; and - at the plurality of component carriers A packet is sent to the network device on a component carrier, the packet including the header and the at least one power headroom control unit.

Since the partial bit information in the header and/or power headroom control unit indicates the transmission format of the power headroom related information, that is, how to correlate the power headroom information about the channel power headroom of the at least one component carrier in one Transmitting on a component carrier, when the user terminal device may transmit the channel power margin of the at least one component carrier on one component carrier in multiple manners, the network device can determine the channel power margin sent by the user terminal device. The transmission format of the related information, so that the channel power margin of at least one component carrier can be correctly received and determined. Therefore, the user terminal device can report the channel power margin of the multiple component carriers to the network device in multiple manners, thereby implementing the power headroom reporting of the user terminal device in the communication network using the carrier aggregation technology.

According to an embodiment of the second aspect of the present invention, there is provided a method of determining power headroom related information of a user terminal device in a network device. The transmission channel of the user equipment is configured with a plurality of component carriers, and the power headroom related information indicates a channel power margin of the at least one component carrier of the user equipment equipment. The method comprises the steps of: - receiving a data packet from a user terminal device, the data packet comprising a header and at least one power headroom control unit, the at least one power headroom control unit comprising the power headroom related information, The header includes information indicating at least one bit of the first transmission format of the power headroom related information in the at least one power headroom control unit and/or the at least one power headroom control unit includes Information indicating at least one bit of the second transmission format of the power headroom related information in the at least one power headroom control unit; and - controlling according to the header and the at least one power headroom a unit to determine the power head related information.

According to an embodiment of the third aspect of the present invention, there is provided a reporting apparatus for reporting power headroom related information to a network device in a user terminal device. The transmission channel of the user equipment is configured with a plurality of component carriers, and the power headroom related information indicates a channel power margin of the at least one component carrier of the user equipment equipment. The reporting device includes: a first device for acquiring the power head related information; and a second device configured to determine a header and at least one power headroom control according to the power headroom related information a unit, the at least one power headroom control unit includes the power headroom related information, the header including a first transmission format to indicate the power headroom related information in the at least one power headroom control unit Information of at least one bit and/or the at least one power headroom control unit includes at least one bit to indicate a second transmission format of the power headroom related information in the at least one power headroom control unit And a third device for transmitting a data packet to the network device on one of the plurality of component carriers, the data packet including the header and the at least one Power headroom control unit.

According to an embodiment of the fourth aspect of the present invention, there is provided an apparatus for acquiring power headroom related information of a user terminal device in a network device. The transmission channel of the user equipment is configured with a plurality of component carriers, and the power headroom related information indicates a channel power margin of the at least one component carrier of the user equipment equipment. The obtaining means comprises: a fourth device for receiving a data packet from the user terminal device, the data packet comprising a header and at least one power headroom control unit, the at least one power headroom control unit comprising the a power headroom related information, the header including information indicating at least one bit of the first transmission format of the power headroom related information in the at least one power headroom control unit and/or the at least one The power headroom control unit includes information indicating at least one bit of the second transmission format of the power headroom related information in the at least one power headroom control unit; and a fifth device for The header and the at least one power headroom control unit determine the power headroom related information.

Various aspects of the invention will be apparent from the description of the embodiments hereinbelow.

2 is a flow diagram of a method for reporting power headroom related information to a network device in a user terminal device in accordance with an embodiment of the present invention.

According to an embodiment of the first aspect of the present invention, there is provided a method for reporting power headroom related information to a network device in a user terminal device. User terminal devices can be implemented in a variety of ways, such as mobile phones or notebook computers. Network devices can be implemented in a variety of ways, such as base stations or relay stations.

The transmission channel of the user equipment is configured with a plurality of component carriers, and the power headroom related information indicates a channel power margin of the at least one component carrier of the user equipment equipment in the plurality of component carriers. The sending channel of the user terminal device is a channel used by the user terminal device to send control information and data information to the network device.

The channel power headroom may be a power headroom corresponding to a plurality of channels, such as a power headroom of a data channel (eg, a physical uplink shared channel (PUSCH)) corresponding to one component carrier of the user terminal equipment or a control corresponding to one component carrier. The power headroom of a channel (eg, Physical Uplink Control Channel (PUCCH)). Channel power headroom can be obtained in a variety of ways. For example, the channel power headroom is the difference between the nominal maximum transmit power of the user terminal equipment and the estimated transmit power of the PUSCH. As another example, the channel power headroom is the difference between the nominal maximum transmit power of the user terminal equipment and the estimated transmit power of the PUCCH. As another example, the channel power headroom is the difference between the nominal maximum transmit power of the user equipment and the total estimated transmit power of the PUSCH and PUCCH.

Referring to FIG. 2, the method includes the step 210: the user terminal device acquires power headroom related information. The power head related information can be expressed in a variety of ways, such as the 6-bit PH field in LTE. Referring to Table 1, the power headroom related information, that is, the PH field of 6 bits, is determined according to the power headroom to which the channel power head belongs. For example, if the power headroom of one component carrier belongs to the power headroom registration POWER_HEADROOM_3, the PH field is 3.

The method further includes a step 220 of determining, by the user terminal device, a header and at least one power headroom control unit based on the power headroom related information. At least one power headroom control unit includes power headroom related information. The header includes information of at least one bit, the information of the at least one bit being used to indicate a first transmission format of the power headroom related information in the at least one power headroom control unit; and/or at least one power headroom control unit The information includes at least one bit, and the information of the at least one bit is used to indicate a second transmission format of the power headroom related information in the at least one power headroom control unit.

The first transmission format is a transmission format of the power head related information. For example, the first transmission format includes a channel type corresponding to a channel power margin of at least one component carrier, such as a power headroom of the data channel or a power headroom of the control channel. As another example, the first transmission format includes a bit length of at least one power headroom control unit, such as a power headroom control unit consuming a total of 42 bits. For another example, the first transmission format includes a carrier index of at least one component carrier: for example, after numbering channels of each component carrier, indexing component carriers by means of indicating numbers; or pre-defining channel transmission power for transmitting each component carrier The order and the corresponding indicator bit are indexed by setting the value of the corresponding indicator bit. As another example, the first transmission format includes a number of cells of at least one power headroom control unit, such as one header corresponding to two power headroom control units.

The second transmission format is a transmission format of the power head related information. For example, the second transmission format includes a carrier index of at least one component carrier: for example, after numbering the channels of each component carrier, the component carrier is indexed by means of the indicator number; or, the channel transmission power for transmitting each component carrier is defined in advance The order and the corresponding indicator bit are indexed by setting the value of the corresponding indicator bit.

The first transmission format and the second transmission format may be used to respectively indicate a transmission format of the power headroom related information or a transmission format that collectively represents the power headroom related information. That is, the transmission format of the power headroom related information may be indicated by only at least one bit included in the header; or the power headroom related information may be indicated by only at least one bit included in the power headroom control unit. The transmission format of the power headroom related information is indicated by at least one bit included in the header and at least one bit included in the power headroom control unit. There are more specific embodiments below to illustrate how to use the header and power headroom control unit to indicate the transmission format of the power headroom related information.

The method also includes the step 230, the user terminal device transmitting a data packet to the network device on one of the plurality of component carriers, the data packet including a header and at least one power headroom control unit. A component carrier may only report the power headroom of its own channel, and may also report the power headroom of the channel of the other one or more component carriers.

Since the partial bit information in the header and/or power headroom control unit indicates the transmission format of the power headroom related information, that is, how to transmit the channel power headroom related information of the at least one component carrier on one component carrier, When the user equipment may transmit the channel power margin of the at least one component carrier on one component carrier in multiple manners, the network device may determine the transmission format of the channel power headroom of the at least one component carrier, thereby correctly A channel power headroom of at least one component carrier is received and determined. Therefore, the user terminal device can report the channel power margin of the plurality of component carriers to the network device in multiple manners, thereby implementing power headroom reporting of the user terminal device in the communication network using the carrier aggregation technology.

The header and the at least one power headroom control unit can indicate the transmission format of the power headroom related information in various ways. A method for specifically reporting information about power headroom by a user terminal device will be specifically described below through various embodiments.

• If only the respective power headroom reports are transmitted on each component carrier, the data channel power headroom and the control channel power headroom of one component carrier may use different headers or share one header, respectively.

In one embodiment, the data path power headroom and the control channel power headroom share a header and the subsequent two power headroom control units. When the physical layer acquires the carrier component as the primary component carrier, the information is transmitted to the MAC layer. The MAC knows that the PDU contains two power headroom control units.

In one embodiment, the data channel power headroom and the control channel power headroom share a header, and the subheader shown in FIG. 1a can be used as a header and through a reserved field of one bit (eg, The first R field in Figure 1a) indicates the data channel power headroom and the transmission format of the control channel power headroom. For example, when the first R field is "0", the power headroom control unit is a control unit as shown in FIG. 1b, and only the data channel power headroom is transmitted; when the first R field is "1" At least one power headroom control unit includes two control units as shown in FIG. 1b, the first control unit transmits a data channel power headroom, and the second control unit transmits a control channel power headroom. Similarly, the reserved field (ie, the R field) in the control unit shown in FIG. 1b can also be used to indicate the data channel power headroom and the control channel power headroom transmission format, that is, the indication header. The number of channels corresponding to the corresponding power headroom control unit. Similarly, the reserved index in the logical channel identifier field shown in FIG. 1a can also be used to indicate that at least one power headroom control unit includes the two control units shown in FIG. 1b.

In still another embodiment, the data channel power headroom and the control channel power headroom of one component carrier use respective headers, and the subheader shown in FIG. 1a can be used as the header. When the second R field is "0", the power headroom control unit is a control unit as shown in FIG. 1b, and only the data channel power headroom is transmitted; when the second R field is "1", The power headroom control unit is a control unit as shown in Figure 1b and transmits only the control channel power headroom. Similarly, the reserved index in the logical channel identifier field shown in FIG. 1a can also be used to indicate the data channel power headroom and the control channel power headroom transmission format, that is, the power corresponding to the indication header. The channel type corresponding to the margin control unit.

In the above embodiment, the information included in the header to indicate at least one bit of the first transmission format is a reserved field and a logical channel identifier field, respectively. The above embodiment utilizes the existing sub-headers and control units in LTE, and the modification to the existing system is small, and the smooth transition of the system can be realized.

• If a power headroom report of at least one component carrier other than itself can be transmitted on one component carrier, the power headroom reports of different component carriers may use different headers or share one header, respectively.

3a through 3c are schematic views of a header and power headroom control unit, respectively, in accordance with one embodiment of the present invention. It is assumed that the transmission channel of the user terminal device uses five component carriers, one of which is a primary component carrier with a control channel and a data channel, and the other component carriers are secondary component carriers with only a data channel (Secondary) Component Carrier). Figure 3a shows a subheader used to identify a MAC SDU (Service Data Unit) in LTE, where the F field indicates the size of the L field and the L field indicates the size of the SDU. The first transmission format can be indicated by using the sub-header shown in FIG. 3a as a header, and the LCID field in FIG. 3a is used to indicate that the power headroom corresponding to the header can include at most six channels of power remaining. Quantity, the L field is used to indicate the length of the power headroom control unit, that is, the number of bits or the number of bytes. Figures 3b and 3c are power headroom control units reporting six channel power headrooms on one component carrier. The six B fields are used to indicate the second transmission format, which respectively correspond to six channels (that is, the data channel on five component carriers and the control channel on one primary component carrier), and "1" indicates that the corresponding channel exists. Power headroom report, “0” indicates that there is no power headroom report for the corresponding channel. The P field is a padding field for ensuring that the number of bits included in the power headroom control unit is an integer multiple of 8, so that the data unit is formed in the form of a byte. Figure 3b shows the power headroom control unit reporting six channel power headrooms, and Figure 3c shows the power headroom control unit reporting five channel power headrooms.

4a and 4b are schematic views of a header and power headroom control unit, respectively, in accordance with yet another embodiment of the present invention. In the header shown in Fig. 4a, the B field is included, and in the power headroom control unit shown in Fig. 4b, the B field is also included. The B field in the header and the B field in the power headroom control unit are used together to indicate the transmission mode of the power headroom report of the six channels, and “1” indicates that there is a power headroom report in the corresponding channel, “0” "" indicates that there is no power headroom report for the corresponding channel. The header and power headroom control unit shown in Figures 4a and 4b reports six channel power headroom.

In still another embodiment, if the power headroom report of another component carrier is transmitted on one component carrier, the subheader shown in FIG. 1a can be used as a header, and the control unit shown in FIG. 1b is used as the power headroom. control unit. If there are six component carrier channels in total, three R fields in the four R fields in FIG. 1a and FIG. 1b are used to index the power headroom report of the component carrier channel to be transmitted, such as 001 indicating the primary component carrier. The power headroom report for the control channel. The LCID field in Figure 1a is used to indicate that only the power headroom of one component carrier channel is reported.

In still another embodiment, the LCID field in Figure 1a is used to index the power headroom report for the component carrier channel to be transmitted.

FIG. 5 is a flowchart of a method for determining power headroom related information of a user terminal device in a network device according to an embodiment of the present invention.

According to an embodiment of the second aspect of the present invention, there is provided a method of determining power headroom related information of a user terminal device in a network device.

The transmission channel of the user terminal device is provided with a plurality of component carriers. The power headroom related information indicates a channel power margin of the at least one component carrier of the plurality of component carriers of the user equipment.

Referring to Figure 5, the method includes the step 510 of the network device receiving a data packet from the user terminal device, the data packet including a header and at least one power headroom control unit. At least one power headroom control unit includes the power headroom related information. The header includes information indicating at least one bit of the first transmission format of the power head related information in the at least one power headroom control unit and/or the at least one power headroom control unit includes to indicate the power The balance related information is information of at least one bit of the second transmission format in the at least one power headroom control unit.

The method also includes the step 520 of the network device determining the power headroom related information based on the header and the at least one power headroom control unit.

The method for the network device to obtain the information about the power headroom corresponds to the foregoing embodiments in which the user terminal device reports the power headroom related information, and details are not described herein again.

6 is a schematic diagram of a reporting device for reporting power headroom related information to a network device in a user terminal device in accordance with an embodiment of the present invention.

According to an embodiment of the third aspect of the present invention, there is provided a reporting apparatus for reporting power headroom related information to a network device in a user terminal device.

The transmission channel of the user terminal device is provided with a plurality of component carriers. The power headroom related information indicates a channel power margin of the at least one component carrier of the plurality of component carriers of the user equipment.

Referring to FIG. 6, the reporting device 600 includes a first device 610, a second device 620, and a third device 630.

The first device 610 is configured to obtain power head related information.

The second device 620 is configured to determine a header and at least one power headroom control unit according to the power headroom related information. At least one power headroom control unit includes power headroom related information, the header including information indicating at least one bit of the first transmission format of the power headroom related information in the at least one power headroom control unit and/or The at least one power headroom control unit includes information indicating at least one bit of the second transmission format of the power headroom related information in the at least one power headroom control unit.

The third device 630 is configured to send a data packet to the network device on one of the plurality of component carriers, the data packet including a header and at least one power headroom control unit.

The functions implemented by the first device 610, the second device 620, and the third device 630 in the reporting device 600 correspond to the foregoing embodiments in which the user terminal device reports the power headroom related information, and details are not described herein.

FIG. 7 is a schematic diagram of an apparatus for acquiring power headroom related information of a user terminal device in a network device according to an embodiment of the present invention.

According to an embodiment of the fourth aspect of the present invention, there is provided an apparatus for acquiring power headroom related information of a user terminal device in a network device.

The transmission channel of the user terminal device is provided with a plurality of component carriers. The power headroom related information indicates a channel power margin of the user terminal equipment at least one of the plurality of component carriers.

Referring to FIG. 7, the acquisition device 700 includes a fourth device 710 and a fifth device 720.

The fourth device 710 is configured to receive a data packet from the user terminal device, the data packet including a header and at least one power headroom control unit. The at least one power headroom control unit includes the power headroom related information, the header including information indicating at least one bit of the first transmission format of the power headroom related information in the at least one power headroom control unit And/or at least one power headroom control unit includes information indicating at least one bit of the second transmission format of the power headroom related information in the at least one power headroom control unit.

The fifth device 720 is configured to determine power head related information according to the header and the at least one power headroom control unit.

The method for the fourth device 710 and the fifth device 720 in the obtaining device 700 to obtain the channel power headroom information corresponds to the foregoing embodiments in which the user terminal device reports the power headroom related information, and details are not described herein again.

It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be considered as illustrative and not restrictive, and the scope of the invention is defined by the scope of the appended claims rather All changes that come within the meaning and range of equivalents of the scope of the claims are included in the invention. Any reference signs in the scope of the patent application should not be construed as limiting the scope of the claimed patent. In addition, it is to be understood that the word "comprising" does not exclude other elements or steps. Multiple devices as stated in the system request can also be implemented by a device via software or hardware. The first, second, etc. words are used to denote names and do not denote any particular order.

600. . . Reporting device

610. . . First device

620. . . Second device

630. . . Third device

700. . . Acquisition device

710. . . Fourth device

720. . . Fifth device

The above and other features, objects, and advantages of the present invention will become more apparent from the detailed description of the accompanying drawings.

1a and 1b are schematic diagrams of a MAC PDU subheader and a power headroom MAC control unit for reporting a power headroom in an LTE system, respectively;

2 is a flowchart of a method for reporting power headroom related information to a network device in a user terminal device according to an embodiment of the present invention;

3a to 3c are schematic views of a header and a power headroom control unit, respectively, according to an embodiment of the present invention;

4a and 4b are schematic views of a header and a power headroom control unit, respectively, according to still another embodiment of the present invention;

5 is a flowchart of a method for determining power headroom related information of a user terminal device in a network device according to an embodiment of the present invention;

6 is a schematic diagram of a reporting device for reporting power headroom related information to a network device in a user terminal device according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of an apparatus for acquiring power headroom related information of a user terminal device in a network device according to an embodiment of the present invention.

The same or similar reference numerals in the drawings represent the same or similar components.

Claims (12)

A method for reporting power headroom related information to a network device in a user terminal device, wherein a transmission channel of the user terminal device is configured with a plurality of component carriers, and the power headroom related information indicates the user terminal device a channel power headroom of at least one of the plurality of component carriers, the method comprising the steps of: - obtaining the power headroom related information; - determining a header and at least one power based on the power headroom related information a remaining amount control unit, the at least one power headroom control unit includes the power headroom related information, the header including a first transmission format for indicating the power headroom related information in the at least one power headroom control unit The information of the at least one bit and/or the at least one power headroom control unit includes information indicating at least one bit of the second transmission format of the power headroom related information in the at least one power headroom control unit; And transmitting a data packet to the network device on one of the plurality of component carriers, The data packet includes the header and the at least one power headroom control unit. The method of claim 1, wherein the channel power headroom comprises a control channel power headroom and/or a data channel power headroom. The method of claim 1, wherein the information of the at least one bit included by the header comprises any one or any combination of the following: a reserved field of at least one bit , logical channel identifier field, and bit length indication field. The method of claim 1, wherein the first transmission format comprises any one or any combination of the following: a channel type corresponding to a channel power margin of the at least one component carrier, the at least a bit length of a power headroom control unit, a carrier index of the at least one component carrier, and a number of cells of the at least one power headroom control unit. The method of claim 1, wherein the second transmission format comprises a carrier index of the at least one component carrier. A method for determining power headroom related information of a user terminal device in a network device, where a sending channel of the user terminal device is configured with a plurality of component carriers, the power headroom related information indicating that the user terminal device is at the a channel power headroom of at least one of the component carriers, the method comprising the steps of: - receiving a data packet from the user terminal device, the data packet comprising a header and at least one power headroom control unit, the at least one The power headroom control unit includes the power headroom related information, the header includes information indicating at least one bit of the first transmission format of the power headroom related information in the at least one power headroom control unit and/or Or the at least one power headroom control unit includes information indicating at least one bit of the second transmission format of the power headroom related information in the at least one power headroom control unit; and - according to the header and the At least one power headroom control unit determines the power headroom related information. The method of claim 6, wherein the channel power headroom comprises a control channel power headroom and/or a data channel power headroom. The method of claim 6, wherein the information of the at least one bit included by the header comprises any one or any combination of the following: a reserved field of at least one bit , logical channel identifier field, and bit length indication field. The method of claim 6, wherein the first transmission format comprises any one or any combination of the following: a channel type corresponding to a channel power margin of the at least one component carrier, the power The bit length of the margin control unit, the carrier index of the at least one component carrier, and the number of units of the at least one power headroom control unit. The method of claim 6, wherein the second transmission format comprises a carrier index of the at least one component carrier. A reporting device for reporting power headroom related information to a network device in a user terminal device, the transmitting channel of the user terminal device is provided with a plurality of component carriers, and the power headroom related information indicates the user terminal a channel power headroom of the at least one component carrier of the plurality of component carriers, the reporting device comprising: a first device for acquiring the power headroom related information; and a second device for The power headroom related information is used to determine a header and at least one power headroom control unit, the at least one power headroom control unit includes the power headroom related information, the header includes an information indicating that the power headroom related information is in the Information of at least one bit of the first transmission format of the at least one power headroom control unit and/or the at least one power headroom control unit includes means for indicating the power headroom related information at the at least one power headroom control unit Information of at least one bit of the second transmission format; and a third device for the plurality of components A data packet is transmitted to a network device on a component carrier of the carrier, the data packet including the header and the at least one power headroom control unit. An apparatus for acquiring power headroom related information of a user equipment in a network device, where a transmission channel of the user equipment is configured with a plurality of component carriers, and the power headroom related information indicates that the user equipment is in the a channel power margin of at least one of the plurality of component carriers, the obtaining means comprising: a fourth device for receiving a data packet from the user terminal device, the data packet including a header and at least one power remainder a quantity control unit, the at least one power headroom control unit includes the power headroom related information, the header including at least one of a first transmission format for indicating the power headroom related information in the at least one power headroom control unit Information of one bit and/or the at least one power headroom control unit includes information indicating at least one bit of the second transmission format of the power headroom related information in the at least one power headroom control unit; a fifth device for determining the unit based on the header and the at least one power headroom control unit Power head related information.