CN101931992A - Method and terminal for realizing power headroom reporting - Google Patents
Method and terminal for realizing power headroom reporting Download PDFInfo
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Abstract
The invention discloses a method and a terminal for realizing power headroom reporting (PHR). In the method, user equipment (UE) which supports carrier aggregation technology determines one or more power headrooms (PH) for distributed component carriers and selects at least one component carrier in an uplink for PHR transmission. According to the scheme provided by the invention, clear description for specific implementation of PHR under a multi-carrier condition is provided, the development of the carrier aggregation technology can be promoted by combining the PHR in the carrier aggregation technology, and the broad application of multi-carrier technology can be promoted. Due to the PHR supporting the multi-carrier condition, the UE can perform PHR transmission for each component carrier, so that an evolved node base (eNB) can know more information on each component carrier on the side of the UE, the eNB or even a core network can conveniently control the UE, and the system performance can be improved. In addition, flexible various implementation modes are provided in the scheme of the invention, and a proper choice can be made according to the actual application condition, so that the adaptability of the overall scheme is enhanced.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and a terminal for reporting power headroom.
Background
An Evolved Universal Terrestrial Radio Access Network (E-UTRAN) of a third generation mobile communication Long Term Evolution (LTE) system is composed of base stations (enbs), and a Power Headroom Reporting (PHR) functional entity exists in a wireless interface Media Access Control (MAC) protocol layer.
The PHR refers to a difference between a UE nominal maximum transmit power and an estimated UpLink shared Channel (UL-SCH, UpLink Share Channel) transmit power reported by a User Equipment (UE) to an eNB in a medium access Control Element (MAC CE, MAC Control Element) manner.
PHR is triggered mainly by several conditions:
1. the PHR-prohibit Timer (prohibitPHR-Timer) is overtime, and the variation of the path loss is larger than a set value (from the last PHR);
2. a PHR period Timer (periodicPHR-Timer) times out;
3. configuration or reconfiguration of PHR functional entities;
and after triggering the PHR, the UE transmits the PHR when the uplink transmission resource supporting the PHR exists.
As shown in fig. 1, a Power Headroom (PH) bit field indicates a Power Headroom in the PHR, the length of the PH bit field is 6 bits, and in addition, there are two reserved bits of R bits, and a default value of the reserved bit is 0 in the prior art.
To meet the increasing demand for high-speed mobile access with large bandwidth, the Third Generation Partnership project (3 GPP) introduced the LTE-Advanced (Long-Term Evolution Advanced) standard. Based on LTE, LTE-Advanced adopts a series of new technologies to expand a frequency domain and a space domain so as to achieve the purposes of improving the utilization rate of frequency spectrum, increasing the system capacity and the like. Among other things, Carrier aggregation (CC) techniques may aggregate two or more Component carriers to support wider frequency bands, such as spectrum aggregation up to 100 MHz. The UE may receive or transmit data on one or more component carriers simultaneously, and may be configured to aggregate different numbers of component carriers with different bandwidths in downlink/uplink.
For the case of multiple carriers, how to schedule uplink transmission resources supporting PHR in multiple component carriers, and how to send the PH of each component carrier when PHR is triggered on a component carrier, no specific implementation is given in the prior art. Therefore, at present, an implementation scheme for how to schedule uplink transmission resources for PHR transmission under a multi-carrier condition is urgently needed.
Disclosure of Invention
In view of this, the main objective of the present invention is to provide a method and a terminal for implementing power headroom reporting, so as to implement PHR under the multi-carrier condition.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for realizing power headroom report, User Equipment (UE) supports carrier aggregation technology, the method comprises: the UE determines one or more Power Headroom (PH) for the allocated component carriers, and selects Power Headroom Reporting (PHR) transmission on at least one uplink component carrier.
The UE determines one or more PHs for the allocated component carriers, specifically: for a component carrier allocated to the UE, the UE determines one PH for one component carrier; or, the UE determines one PH for a plurality of component carriers; alternatively, the UE determines one PH for both one component carrier and a plurality of component carriers.
For the component carriers allocated to the UE, the UE determines a PH for one component carrier, specifically: the UE respectively determines a PH for each allocated component carrier; or, for the component carrier allocated to the UE, the UE determines one PH for multiple component carriers, specifically: the UE determines one PH for all the allocated component carriers; or, the plurality of component carriers of the determined PH are a plurality of component carriers allocated to the UE and consecutive in a frequency domain; or, the multiple component carriers of the determined PH are multiple component carriers within the same transmission filter bandwidth allocated to the UE and belonging to the UE.
The PH corresponds to only one component carrier, and the determined PH is: the difference between the average nominal maximum transmission power of each component carrier of the UE and the uplink shared channel (UL-SCH) transmission power estimated by the UE on the component carrier;
or, the PH corresponds to only one component carrier, and the determined PH is: the difference value between the nominal maximum transmitting power of the UE and the uplink shared channel (UL-SCH) transmitting power estimated by the UE on the component carrier wave;
or, the PH corresponds to a plurality of component carriers, and the determined PH is:
a difference between a nominal maximum transmit power of the UE and a sum of UL-SCH transmit powers estimated by the UE on respective component carriers corresponding to the PH; or,
a difference between a nominal maximum transmit power of the UE and an arithmetic average of a sum of UL-SCH transmit powers estimated by the UE on respective component carriers corresponding to the PH; or,
a difference between a nominal maximum transmit power of the UE and an UL-SCH transmit power estimated by the UE on any one of the component carriers corresponding to the PH; or,
an average value of a difference between a nominal maximum transmission power of the UE and a sum of UL-SCH transmission powers estimated by the UE on respective component carriers corresponding to the PH.
The selecting the PHR on at least one component carrier of the uplink specifically includes: selecting to send a PH on at least one component carrier with uplink transmission resources supporting PHR, wherein the sent PHR corresponding to the PH at least comprises a triggered PHR.
The component carrier transmitting the PH is: any component carrier supported by the UE; or a PHR component carrier configured by a base station eNB, wherein the PHR component carrier is a component carrier used for the UE to perform PHR transmission; further, the configuration of the PHR component carrier is implemented by the eNB sending dedicated signaling to the UE.
The selecting the at least one component carrier with the uplink transmission resource supporting the PHR for the PHR transmission comprises: when uplink transmission resources supporting the PHR exist on the component carrier triggering the PHR, selecting at least one component carrier to carry out PHR transmission; or when at least one component carrier has uplink transmission resources supporting the PHR, selecting at least one component carrier to carry out PHR transmission.
Selecting a component carrier for PHR transmission when uplink transmission resources supporting PHR exist on the component carrier, wherein the PHR transmission comprises the following steps: setting a component carrier index corresponding to the sent PH, and sending the component carrier index and the PH on a component carrier; and/or the presence of a gas in the gas,
selecting a component carrier for PHR transmission when uplink transmission resources supporting PHR exist on the component carrier, wherein the selecting the component carrier for PHR transmission comprises: transmitting a PH on a component carrier; or, a combined PH obtained by organizing a plurality of PHs according to a set rule is sent on one component carrier; or, one PH is respectively transmitted through at least one component carrier, and a combined PH obtained by organizing a plurality of PHs according to a set rule is also transmitted through at least one component carrier, where the component carrier transmitting one PH is different from the component carrier transmitting the combined PH; and/or the presence of a gas in the gas,
the selecting component carrier for PHR transmission is to select one component carrier to transmit multiple PHs, where the transmitting the PHs includes: and organizing the PHs according to a set rule to obtain a combined PH, and sending the combined PH on the component carrier.
The set rule is as follows: pre-configured by the eNB to the UE; or sending a dedicated signaling to the UE through the eNB for providing to the UE; and/or, the set rule is: setting an arrangement rule of each PH, or an arrangement rule of a component carrier index and a PH corresponding to a component carrier, or an arrangement rule of a PHR identifier and a PH corresponding to a component carrier.
The value of the logical channel identifier LCID for identifying the PHR under the multi-carrier condition is: a newly set value that is not within the range of the existing LCID value; or, a value selected from the existing LCID reserved value interval; alternatively, there is an LCID value used to identify the PHR.
When the existing LCID value for identifying the PHR is used to identify the PHR under the multi-carrier condition, the method further includes, before performing PHR transmission: the eNB informs the UE of the PHR under the condition of multi-carrier currently; or the UE determines that the PHR performed by the UE is the PHR under the condition of multiple carriers according to the capability information of the UE, and the eNB determines that the PHR performed by the UE is the PHR under the condition of multiple carriers according to the capability information of the UE.
A terminal for realizing power headroom reporting supports a carrier aggregation technology, and comprises: the device comprises a determining unit and a reporting unit, wherein the determining unit is used for determining one or more PHs for component carriers allocated to UE; the reporting unit is configured to select at least one component carrier of an uplink for PHR transmission.
The reporting unit is specifically configured to: selecting to send a PH on at least one component carrier with uplink transmission resources supporting PHR, wherein the sent PHR corresponding to the PH at least comprises a triggered PHR.
According to the scheme provided by the invention, specific description is given to the specific implementation of PHR under the condition of multiple carriers, and the PHR is combined in the carrier aggregation technology, so that the development of the carrier aggregation technology can be promoted, and the wide application of the multiple carrier technology is promoted. Due to supporting PHR under the condition of multiple carriers, the UE can transmit PHR aiming at each component carrier, so that the eNB can know more information of each component carrier at the UE side, the eNB and even a core network can conveniently control the UE, and the system performance is favorably improved.
In addition, the scheme of the invention provides flexible and various implementation modes, and the implementation modes can be properly selected according to the actual application condition, so that the adaptability of the whole scheme is enhanced.
Drawings
Fig. 1 is a diagram illustrating a MAC CE format of a conventional PHR;
FIG. 2 is a diagram illustrating a MAC CE format of a PHR according to a second embodiment of the present invention;
fig. 3 is a diagram illustrating a MAC CE format of a PHR according to a third embodiment of the present invention;
fig. 4 is a diagram illustrating a MAC CE format of a PHR according to a fourth embodiment of the present invention;
fig. 5 is a diagram illustrating a MAC CE format of a PHR according to a fifth embodiment of the present invention;
fig. 6 is a diagram illustrating a MAC CE format of a PHR according to a sixth embodiment of the present invention;
fig. 7 is a diagram illustrating a MAC CE format of a PHR according to a seventh embodiment of the present invention;
fig. 8 is a diagram illustrating a MAC CE format of a PHR in an eighth embodiment of the present invention;
fig. 9 is a schematic structural diagram of a terminal implementing the PHR in the present invention.
Detailed Description
In the invention, the UE determines one or more PHs for the allocated component carriers and selects at least one component carrier of an uplink for PHR transmission.
The above determining, by the UE, one or more PHs for the allocated component carriers may be determining, by the UE, one or more PHs for the allocated at least one component carrier, and is specifically implemented as:
when only one component carrier is allocated to the UE, the UE determines a PH for the component carrier;
when multiple component carriers are allocated to the UE, for the multiple component carriers allocated to the UE, the UE determines a PH for one of the component carriers, where the PH only corresponds to one component carrier, and the UE may determine one or more PHs only corresponding to one component carrier; or, a PH is determined for a plurality of component carriers, where the PH corresponds to the plurality of component carriers, any one of the plurality of component carriers also corresponds to the PH, and the UE may determine one or more PHs corresponding to the plurality of component carriers, where the plurality of component carriers corresponding to each PH may be partially the same or all different; or, one PH may be determined for both one component carrier and multiple component carriers, and the UE may determine one or more PHs corresponding to only one component carrier and one or more PHs corresponding to multiple component carriers, where the multiple component carriers corresponding to the PHs may be partially the same or all different. The UE may determine a PH for each allocated component carrier, that is, the UE determines a PH for each allocated component carrier; one PH may also be determined for all the allocated component carriers.
Preferably, if a plurality of component carriers allocated to the UE are contiguous in the frequency domain, the UE may determine one PH for the allocated plurality of component carriers contiguous in the frequency domain; alternatively, the UE may determine one PH for multiple component carriers allocated to the UE within the same transmit filter bandwidth of the UE.
When determining PH, specifically, determining PH may include determining PH through reading of a physical layer. The number of component carriers corresponding to the PH is different, and the specific implementation thereof is also different, which will be described separately below.
When the PH corresponds to only one component carrier, the determined PH may be: a difference between an average nominal maximum transmit power of each component carrier of the UE and an UL-SCH transmit power estimated by the UE on that component carrier, wherein the average nominal maximum transmit power of each component carrier of the UE may be the nominal maximum transmit power of the UE divided by the number of component carriers allocated to the UE; or the difference between the nominal maximum transmission power of the UE and the uplink shared channel (UL-SCH) transmission power estimated by the UE on the component carrier.
When the PH corresponds to a plurality of component carriers, the determined PH may be: a difference between a nominal maximum transmit power of the UE and a sum of UL-SCH transmit powers estimated by the UE on respective component carriers corresponding to the PH; or a difference between a nominal maximum transmit power of the UE and an arithmetic average of a sum of UL-SCH transmit powers estimated by the UE on respective component carriers corresponding to the PHs; or a difference between a nominal maximum transmission power of the UE and an UL-SCH transmission power estimated by the UE on any one of the component carriers corresponding to the PH; or an average value of a difference between a nominal maximum transmission power of the UE and a sum of UL-SCH transmission powers estimated by the UE on respective component carriers corresponding to the PHs.
When the multiple component carriers corresponding to the PH are all component carriers allocated to the UE, the determined PH may be: a difference between a nominal maximum transmit power of the UE and a sum of UL-SCH transmit powers estimated by the UE on each component carrier; or, a difference between a nominal maximum transmit power of the UE and an arithmetic average of a sum of UL-SCH transmit powers estimated by the UE on each component carrier; or the difference between the nominal maximum transmission power of the UE and the UL-SCH transmission power estimated by the UE on any one component carrier; or, an average of the difference between the nominal maximum transmit power of the UE and the sum of the UL-SCH transmit powers estimated by the UE on the respective component carriers, i.e., the difference between the nominal maximum transmit power of the UE and the sum of the UL-SCH transmit powers estimated by the UE on the respective component carriers, is divided by the number of component carriers allocated to the UE.
The above selecting the PHR transmission on at least one component carrier of the uplink refers to: and selecting to transmit the PH on at least one component carrier with the uplink transmission resource supporting the PHR, wherein the PHR corresponding to the transmitted PH at least comprises a triggered PHR. Since the PHR is triggered on the component carrier, the UE may send the PH on the component carrier having the uplink transmission resource supporting the PHR, where the sent PH corresponds to one or more component carriers, and thus, the sent PH corresponds to the PHR of the component carrier corresponding to the PH. If PHR is triggered on one component carrier, the component carrier may also be referred to as a PHR-triggered component carrier.
The component carrier transmitting the PH may be any component carrier supported by the UE, i.e., any component carrier allocated to the UE; the PHR component carrier may also be a PHR component carrier configured by the eNB, that is, a component carrier configured by the eNB in a component carrier allocated to the UE for the UE to perform PHR transmission, and the configuration of the PHR component carrier may be implemented by the eNB transmitting dedicated signaling to the UE.
Selecting at least one component carrier with uplink transmission resources supporting PHR to carry out PHR transmission, and the specific implementation comprises the following steps:
the method may include selecting at least one of the component carriers to perform PHR transmission only when uplink transmission resources supporting the PHR are available on the component carrier triggering the PHR, where a PH transmitted on the component carrier may correspond to one component carrier, and at this time, the PHR corresponding to the transmitted PH is the triggered PHR; the PHs sent on the component carriers may also correspond to multiple component carriers, at this time, the PHR corresponding to the sent PHs at least includes a triggered PHR, the PHR corresponding to the sent PHs may be the triggered PHR, and the PHR corresponding to the sent PHs may also include not only the triggered PHR but also PHR of other component carriers, except for the component carrier triggering the PHR, in each component carrier corresponding to the PHs.
At least one of the component carriers may be selected to perform PHR transmission as long as at least one of the component carriers has uplink transmission resources supporting PHR, or even all the component carriers having the uplink transmission resources supporting PHR may be selected to perform PHR transmission, at this time, no matter whether the UE determines one PH for one component carrier or determines one PH for a plurality of component carriers, the component carrier performing PHR transmission may be a component carrier corresponding to the PH or a component carrier different from the component carrier corresponding to the PH, as long as the corresponding component carrier has uplink transmission resources supporting PHR. At this time, the PHR corresponding to the transmitted PH at least includes the triggered PHR.
As can be seen from the above description, only when there is uplink transmission resource supporting the PHR on the component carrier triggering the PHR, at least one of the component carriers is selected for PHR transmission, in this case, only one single PH needs to be transmitted on one component carrier, and since the PH may be a PH corresponding to multiple component carriers, the PH may be transmitted on multiple component carriers. In this case, since a certain relationship is not required between the component carrier transmitting the PH and the component carrier corresponding to the PH, only each component carrier having the uplink transmission resource supporting the PHR is fully utilized to perform the PHR transmission, and thus, the PH transmitted on one component carrier is not limited to only one single PH, but may be multiple PHs.
The PHR transmission is performed as long as there is a component carrier supporting uplink transmission resources of the PHR, and since there is no fixed correspondence between a component carrier transmitting a PH and a component carrier corresponding to the PH at this time, even if a single PH is transmitted on one component carrier, the component carrier corresponding to the PH needs to be given, and it is possible to identify by setting a component carrier index, how to set the component carrier index is determined, and both the UE and the eNB know. If the UE determines a PH for one component carrier, when sending the PH, the UE may set an index of the component carrier corresponding to the PH as a corresponding index of the component carrier, and send the index of the component carrier corresponding to the PH and the PH on the component carrier; if the UE determines a PH for multiple component carriers, when sending the PH, the UE also sets a component carrier index corresponding to the PH, and then sends the set component carrier index and the PH on the component carrier, where the component carrier index may be an index of one of the component carriers corresponding to the PH, or may be a value unrelated to an index of each component carrier corresponding to the PH.
When multiple PHs are transmitted on one component carrier, the PHs may be organized according to a set rule to obtain a combined PH, and then the combined PH is transmitted on the component carrier. The set rule is mainly used to determine an organization form of multiple PHs when the multiple PHs are transmitted on one component carrier, that is, how to organize the multiple PHs to obtain a combined PH, and may be an arrangement rule of each set PH, or an arrangement rule of a component carrier index and a PH corresponding to a component carrier, or an arrangement rule of a component carrier PHR identifier and a PH corresponding to a component carrier, and the like. The setting rule may be configured to the UE in advance by the eNB, or may be provided to the UE by sending a dedicated signaling to the UE through the eNB. The combined PH obtained by organizing each PH according to the set rule is sent on one component carrier, so that the control overhead of MAC data can be saved.
As long as at least one component carrier has uplink transmission resources supporting PHR, selecting at least one component carrier for PHR transmission, in this case, when multiple PHs need to be transmitted, one or more separate PHs may be dispersed on a part of the component carriers for transmission, and each component carrier in the part of the component carriers only transmits one separate PH; or, a combined PH obtained by organizing the multiple PHs according to a set rule is sent by at least one component carrier, that is, the combined PH obtained by organizing the multiple PHs according to the set rule is sent in a centralized manner; or, one PH is sent through at least one component carrier, or a combined PH obtained by organizing multiple PHs according to a set rule is sent through at least one component carrier, where the component carrier sending one PH is different from the component carrier sending the combined PH, that is, only one single PH is sent on each component carrier in a part of component carriers, and the combined PH obtained by organizing the multiple PHs according to the set rule is sent on each component carrier in another part of component carriers. The transmission form of the PH on the component carrier can be flexibly selected as long as all triggered PHR can be completed.
In the prior art, a MAC header includes a Logical Channel Identifier (LCID) field, where the LCID field is used to identify a Logical Channel corresponding to a MAC Service Data Unit (SDU), or a type of a MAC CE, or a padding bit, and the padding bit is used to fill a MAC Protocol Data Unit (PDU). The LCID length is 5 bits and the binary value ranges from 0 to 11111. Wherein, the reserved value-taking interval of LCID is represented as [01011-11001] by binary. Specifically, when the LCID value is 11010, the MAC CE is identified as PHR.
Thus, in the specific implementation of the scheme of the invention, in the MAC PDU, the PHR under the condition that the MAC CE is a multi-carrier can be identified by introducing a new value into the LCID, and the value can be selected from the existing LCID reserved value interval; or may be newly set, that is, set to other values that are not within the range of the existing LCID value. In addition, the existing LCID value for identifying the MAC CE as the PHR may still be used, but the MAC CE identified by the value is the PHR in the case of multi-carrier, in this case, the eNB needs to notify the UE of the PHR in the case of multi-carrier through a Radio Network Controller (RNC) message; or, the UE determines that the PHR performed by the UE is the PHR in the case of the multi-carrier according to the capability information of the UE, the eNB determines that the PHR performed by the UE is the PHR in the case of the multi-carrier according to the capability information of the UE, and the capability information of the UE may be provided to the eNB when the UE establishes a connection with the eNB.
In order to make the implementation of the present invention more clear, the following is further described by some specific examples. In the following specific examples, both the UE and the eNB support the carrier aggregation technology, and adopt a Frequency Division Duplex (FDD) mode, and the maximum uplink bandwidth supported is 100MHz, which is 5 times the maximum uplink bandwidth supported by the lte erelease 8 system.
Detailed description of the preferred embodiment
The UE operates on 4 component carriers, i.e. the UE is allocated to 4 component carriers, component carrier 0, component carrier 1, component carrier 2 and component carrier 3. The component carrier 0, the component carrier 1, the component carrier 2 and the component carrier 3 all trigger the PHR, and each component carrier has an uplink transmission resource supporting the PHR.
If the UE determines one PH for each allocated component carrier, that is, the PH corresponds to only one component carrier, the determined PHs are: PH valuei＝Pmax/4-PiWherein, i takes the values of 0, 1, 2 and 3; PH valueiA PH determined for a component carrier i; pmaxIs the nominal maximum transmit power of the UE, equally distributed over 4 component carriers, correspondingly, Pmax4 is the average nominal maximum transmitting power of the UE on each component carrier; piThe UL-SCH transmit power estimated for the UE on component carrier i. The PH values determined may be: PH valuei＝Pmax-Pi。
When the UE performs the PHR transmission, each PH may be transmitted through the component carrier corresponding to the PH, that is, the component carrier 0 is selected to transmit the PH0Component carrier 1 transmit PH1Component carrier 2 transmit PH2Component carrier 3 transmit PH3(ii) a Or selecting a component carrier, such as component carrier 3, to send a combined PH obtained by organizing each PH according to a set rule; the PH can also be sent by selecting the component carrier 31And pH2Selecting component carrier 0 to send PH according to combined PH obtained after organizing according to set rules0Component carrier 1 transmit PH3(ii) a Component carrier 0 can also be selected to transmit PH1、PH2And pH3Combinations PH obtained after organizing according to a set rule, and the like, are not illustrated herein.
If the PHR of the UE determines one PH for the 4 allocated component carriers, that is, the PH corresponds to only 4 component carriers, the determined PH is: PH is Pmax-(P0+P1+P2+P3)＝Pmax-P0-P1-P2-P3(ii) a Or PH is Pmax-(P0+P1+P2+P3) (ii)/4; or PH is Pmax-rand(P0，P1，P2，P3) (ii) a Or, pH ═ Pmax-(P0+P1+P2+P3))/4＝(Pmax-P0-P1-P2-P3)/4. Wherein, PmaxA nominal maximum transmit power for the UE; p0、P1、P2、P3Respectively estimating the UL-SCH transmitting power of the UE on a component carrier 0, a component carrier 1, a component carrier 2 and a component carrier 3; rand (P)0，P1，P2，P3) Is arbitrarily shown in P0、P1、P2、P3One of them is selected.
When the UE performs PHR transmission, it may select one component carrier, such as component carrier 1, to transmit a PH; multiple component carriers, such as component carrier 0 and component carrier 2, are also selected to transmit the PH, and so on.
Specific example II
The UE operates on 4 component carriers, i.e. the UE is allocated to 4 component carriers, component carrier 0, component carrier 1, component carrier 2 and component carrier 3. The PHR is triggered on component carrier 1 and not triggered on other component carriers.
At time t1, there are uplink transmission resources supporting PHR on component carrier 2 and component carrier 3, and since the UE only selects at least one of the component carriers to perform PHR transmission when there are uplink transmission resources supporting PHR on the component carrier corresponding to the PH, the UE does not select the component carrier to transmit the PH corresponding to component carrier 1.
Time t2，t2＞t1When there is uplink resource supporting PHR on component carrier 1, UE determines PH for component carrier 1, that is, PH1Selecting component carrier 1 to transmit PH corresponding to component carrier 1, namely PH1The format of the MAC CE in this example is shown in fig. 2. Since the UE determines the PH only for the component carrier 11And requires transmission of PH1Is component carrier 1, the PH transmitted on component carrier 1 is necessarily corresponding to component carrier 1, and therefore, no other information is needed to identify the PH transmitted on component carrier 1 at this time1The corresponding component carrier.The current PHR is a PHR on the component carrier 1, which is the same as the triggered PHR.
Specific example III
The UE operates on 8 component carriers, i.e. the UE is allocated to 8 component carriers, component carrier 0 to component carrier 7 respectively. PHR is triggered on component carrier 0 and not triggered on other component carriers.
At the present moment, only uplink transmission resources supporting the PHR are available on the component carrier 0, and since the UE selects at least one of the component carriers for PHR transmission as long as the UE has uplink transmission resources supporting the PHR on at least one of the component carriers, at this moment, the UE determines the PH, that is, the PH, for the component carrier 00Selecting component carrier 0 to transmit PH corresponding to component carrier 0, namely PH0The format of the MAC CE in this example is shown in fig. 3. Since there is no fixed correspondence between the component carrier that sends the PH and the component carrier corresponding to the PH, the component carrier corresponding to the PH that is sent needs to be identified by the auxiliary information, such as the component carrier index, to indicate the component carrier corresponding to the current PHR, where the component carrier index in this example is 3 bits, and binary 000 shown in fig. 3 is used to indicate the component carrier index 0. The current PHR is a PHR on component carrier 0, which is the same as the triggered PHR.
In this example, in the MAC PDU, the PHR of the MAC CE under the multi-carrier condition is identified by introducing a new value to the LCID, and the value is selected from the existing LCID reserved value interval.
Specific example No. four
The UE operates on 5 component carriers, i.e. the UE is allocated to 5 component carriers, component carrier 0 to component carrier 4, respectively, where component carrier 1 is adjacent to component carrier 4 in the frequency domain.
In view of the adjacent component carriers 1 and 4 in the frequency domain, in this example, the UE determines a PH for the component carriers 1 and 4, where the PH has only one corresponding component carrier index, and may be 1, or 4, or another natural number unrelated to 0 to 4, and is 1 in this example.
The component carriers 0 and 3 are PHR component carriers configured by the eNB, and allow the component carriers 0 and/or 3 to transmit PHs corresponding to other component carriers. The configuration of the PHR component carrier may be achieved by the eNB sending dedicated signaling to the UE.
The PHR is triggered on component carrier 1, the PHR is also triggered on component carrier 2, and the PHR is not triggered on other component carriers. At the present time, there are uplink transmission resources supporting PHR on component carrier 0 and component carrier 3, and since the component carrier 0 and/or component carrier 3 is allowed to send PHs corresponding to other component carriers, at this time, the UE determines PHs, that is, PHs, for component carrier 1 and component carrier 41Selecting component carrier 0 to transmit PH corresponding to component carrier 1, i.e. PH1The UE determines PH, PH for component carrier 22Selecting component carrier 3 to transmit PH corresponding to component carrier 2, i.e. PH2The format of the MAC CE in this example is shown in fig. 4, where the two-bit binary component carrier index 1 indicates PH1Corresponding to component carrier 1 and component carrier 4, component carrier index 2 indicates PH2Only corresponding to component carrier 2, the current PHR corresponds to the PHR on component carrier 1, component carrier 4 and component carrier 2, and different from the triggered PHR, the PHR corresponding to the transmitted PH includes the triggered PHR.
In this example, in the MAC PDU, the existing LCID value for identifying the MAC CE as the PHR is still used, and the MAC CE identified by the value is the PHR in the case of multiple carriers. And the UE determines that the PHR is the PHR under the condition of multi-carrier according to the self capability information or the RNC message of the eNB.
Detailed description of the invention
The UE operates on 4 component carriers, i.e. the UE is allocated to 4 component carriers, component carrier 0, component carrier 1, component carrier 2 and component carrier 3, respectively, which 4 component carriers are also supported by the UE. The component carrier 1 and the component carrier 2 trigger the PHR respectively, and the other component carriers do not trigger the PHR.
At the current moment, uplink transmission resources supporting the PHR are available on the component carrier 0 and the component carrier 3. Since the UE selects at least one component carrier for PHR transmission as long as the UE has uplink transmission resources supporting the PHR on the at least one component carrier, at this time, the UE determines a PH, that is, a PH, for the component carrier 11Determining a PH, i.e., PH, for component carrier 22Will pH is adjusted1And pH2Organizing according to a set rule to obtain a combined PH, selecting a component carrier 0 or a component carrier 3 to transmit a PH corresponding to a component carrier 1 and a PH corresponding to a component carrier 2, that is, transmitting the combined PH on the component carrier 0 or the component carrier 3, where the format of the MAC CE in this example is shown in fig. 5, and the set rule in this example is to use the PH to transmit the combined PH on the component carrier 0 or the component carrier 31And pH2And (4) arranging in sequence. The current PHR corresponds to the PHR on component carrier 1 and component carrier 2, and is the same as the triggered PHR.
Since there is no fixed correspondence between the component carrier that sends the PH and the component carrier corresponding to the PH, the component carrier corresponding to the PH that is sent needs to be identified by setting a rule to include auxiliary information, such as a component carrier PHR identifier, to indicate the component carrier corresponding to the current PHR, where the component carrier PHR identifier in this example is 4 bits, and the component carrier corresponding to the current PH that is sent is represented by sequentially taking values of 0 and 1 of each bit, so that the control overhead of MAC data can be saved. In this example, 0 is used to indicate that the PH of the corresponding component carrier is not currently transmitted, 1 is used to indicate that the currently transmitted PH is the PH of the corresponding component carrier, and an opposite value-taking representation is also possible. The setting rule further comprises that the bits sequentially correspond to the component carriers from low to high from front to back, and the PH is arranged according to the sequence of the component carriers.
Alternatively, the component carrier 0 and the component carrier 3 may be selected to transmit the PH corresponding to the component carrier 1 and the PH corresponding to the component carrier 2 at the same time, and the format of the MAC CE corresponding to each component carrier is still as shown in fig. 5.
Specific example six
The UE operates on 8 component carriers, i.e. the UE is allocated to 8 component carriers, component carrier 0 to component carrier 7 respectively. The PHR is triggered on component carrier 4 and not triggered on other component carriers.
At the present moment, only uplink transmission resources supporting the PHR are available on the component carrier 0, and as long as the UE has uplink transmission resources supporting the PHR on at least one component carrier, at least one of the component carriers is selected for PHR transmission, at this moment, the UE selects to report all PHs, determines one PH for each allocated component carrier, that is, determines one PH for the component carrier 00Determining a PH, i.e., PH, for component carrier 11..7In this example, the determined multiple PHs are organized according to a set rule to obtain a combined PH, and then the combined PH is transmitted on the component carrier 0, where the set rule is to organize the PHs in a fixed order, for example, the PHs are arranged in the order of the component carriers, and the format of the MAC CE is as shown in fig. 6. The current PHR corresponds to a PHR on each component carrier, and different from the triggered PHR, the PHR corresponding to the sent PH comprises the triggered PHR.
The setting rule may be pre-configured by the eNB. The setting rule may also arrange the corresponding PHs according to the frequency band height of each component carrier, for example, arrange the corresponding PHs according to the sequence from the lower to the higher of the frequency domain of each component carrier.
In this example, in the MAC PDU, a new value is introduced for the LCID to identify that the MAC CE is the PHR in the case of multiple carriers, and the value is newly set, that is, set to another value that is not within the range of the existing LCID value.
Detailed description of the preferred embodiment
The UE operates on 8 component carriers, i.e. the UE is allocated to 8 component carriers, component carrier 0 to component carrier 7 respectively. The component carrier 1 and the component carrier 2 trigger the PHR respectively, and the other component carriers do not trigger the PHR.
At the current time, uplink transmission resources supporting the PHR are available on component carrier 0 and component carrier 7.Since the UE selects at least one component carrier for PHR transmission as long as the UE has uplink transmission resources supporting the PHR on the at least one component carrier, the UE determines a PH, that is, the PH, for the component carrier 1 at this time1Determining a PH, i.e., PH, for component carrier 22Selecting component carrier 0 or component carrier 7 for PHR transmission, in this example, the PH value1And pH2The combined PH is obtained after organizing according to a set rule, where the set rule is to identify a component carrier corresponding to the transmitted PH by using auxiliary information, such as a component carrier PHR identifier, to indicate a component carrier corresponding to a current PHR, arrange corresponding PHs according to an order of the component carriers, and then transmit the combined PH on a component carrier 0 or a component carrier 7, where a format of the MAC CE is shown in fig. 7. The current PHR corresponds to the PHR on component carrier 1 and component carrier 2, and is the same as the triggered PHR.
Since there is no fixed correspondence between the component carrier transmitting the PH and the component carrier corresponding to the PH, it is necessary to identify the component carrier corresponding to the transmitted PH by including the auxiliary information in the setting rule. The PHR identifier in this example is 8 bits, each bit corresponds to each component carrier from low to high sequentially from front to back, and the component carrier corresponding to the currently transmitted PH is represented by the value of 0 or 1 of each bit sequentially, so that the control overhead of the MAC data can be saved. In this example, 0 is used to indicate that the PH of the corresponding component carrier is not currently transmitted, 1 is used to indicate that the currently transmitted PH is the PH of the corresponding component carrier, and an opposite value-taking representation is also possible.
In this example, in the MAC PDU, the PHR of the MAC CE under the multi-carrier condition is identified by introducing a new value to the LCID, and the value is selected from the existing LCID reserved value interval.
Detailed description of the invention
The UE operates on 4 component carriers, that is, the UE is allocated to 4 component carriers, which are respectively a component carrier 0, a component carrier 1, a component carrier 2, and a component carrier 3, and are 4 component carriers within the same transmit filter bandwidth belonging to the UE. The PHR is triggered on component carrier 1 and not triggered on other component carriers.
As long as the UE has uplink transmission resources supporting the PHR on at least one component carrier, the UE selects at least one component carrier for PHR transmission, so that when any carrier on which the UE operates has uplink transmission resources supporting the PHR, for example, when there is uplink transmission resource supporting the PHR on component carrier 2, the UE determines a PH for all allocated component carriers, which is specifically as follows: PH is Pmax-P0-P1-P2-P3Wherein P ismaxA nominal maximum transmit power for the UE; p0、P1、P2、P3The UL-SCH transmit powers estimated by the UE on component carrier 0, component carrier 1, component carrier 2, and component carrier 3, respectively. The UE selects component carrier 2 to transmit PH, and the format of the MAC CE in this example is shown in fig. 8.
Since the UE determines one PH for all allocated component carriers, the PHs sent on the component carriers necessarily correspond to all the component carriers, and therefore, no other information is needed to identify the component carrier corresponding to the PH sent on the component carrier 2. The current PHR corresponds to a PHR on each component carrier, and different from the triggered PHR, the PHR corresponding to the sent PH comprises the triggered PHR.
Fig. 9 is a schematic structural diagram of a terminal implementing PHR in the present invention, and as shown in fig. 9, the terminal supports a carrier aggregation technology, and at least includes: the device comprises a determining unit and a reporting unit, wherein the determining unit is used for determining one or more PHs for component carriers allocated to UE; the reporting unit is used for selecting at least one component carrier of an uplink to carry out PHR transmission.
The reporting unit is specifically configured to select to send a PH on at least one component carrier having an uplink transmission resource supporting a PHR, where the sent PHR corresponding to the PH at least includes a triggered PHR.
The specific implementation inside each unit is completely the same as the previous description, and is not described again here.
The triggering of the PHR may be triggering the PHR according to a currently set PHR triggering event, as mentioned in the background art; the PHR may also be triggered according to a newly set PHR trigger event, and the newly set PHR trigger event may be pre-configured by the eNB.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (13)
1. A method for realizing power headroom report, a user equipment UE supports a carrier aggregation technology, the method is characterized in that:
the UE determines one or more Power Headroom (PH) for the allocated component carriers, and selects Power Headroom Reporting (PHR) transmission on at least one uplink component carrier.
2. The method according to claim 1, wherein the UE determines one or more PHs for the allocated component carriers, specifically: for the component carriers allocated to the UE,
the UE determines one PH for one component carrier; or,
the UE determines one PH for a plurality of component carriers; or,
the UE determines one PH for both one component carrier and a plurality of component carriers.
3. The method of claim 2,
for the component carriers allocated to the UE, the UE determines a PH for one component carrier, specifically: the UE respectively determines a PH for each allocated component carrier; or,
for the component carriers allocated to the UE, the UE determines one PH for a plurality of component carriers, specifically: the UE determines one PH for all the allocated component carriers; or,
the plurality of component carriers of the determined one PH are a plurality of component carriers which are allocated to the UE and are contiguous in a frequency domain; or,
the plurality of component carriers of the determined PH are a plurality of component carriers within the same transmission filter bandwidth allocated to the UE and belonging to the UE.
4. The method of claim 2,
the PH corresponds to only one component carrier, and the determined PH is: the difference between the average nominal maximum transmission power of each component carrier of the UE and the uplink shared channel (UL-SCH) transmission power estimated by the UE on the component carrier;
or, the PH corresponds to only one component carrier, and the determined PH is: the difference value between the nominal maximum transmitting power of the UE and the uplink shared channel (UL-SCH) transmitting power estimated by the UE on the component carrier wave;
or, the PH corresponds to a plurality of component carriers, and the determined PH is:
a difference between a nominal maximum transmit power of the UE and a sum of UL-SCH transmit powers estimated by the UE on respective component carriers corresponding to the PH; or,
a difference between a nominal maximum transmit power of the UE and an arithmetic average of a sum of UL-SCH transmit powers estimated by the UE on respective component carriers corresponding to the PH; or,
a difference between a nominal maximum transmit power of the UE and an UL-SCH transmit power estimated by the UE on any one of the component carriers corresponding to the PH; or,
an average value of a difference between a nominal maximum transmission power of the UE and a sum of UL-SCH transmission powers estimated by the UE on respective component carriers corresponding to the PH.
5. The method according to claim 1, wherein the selecting for PHR transmission on at least one component carrier of an uplink specifically includes: selecting to send a PH on at least one component carrier with uplink transmission resources supporting PHR, wherein the sent PHR corresponding to the PH at least comprises a triggered PHR.
6. The method of claim 5,
the component carrier transmitting the PH is: any component carrier supported by the UE; or a PHR component carrier configured by a base station eNB, wherein the PHR component carrier is a component carrier used for the UE to perform PHR transmission;
further, the configuration of the PHR component carrier is implemented by the eNB sending dedicated signaling to the UE.
7. The method of claim 5, wherein the selecting PHR transmission on at least one component carrier with PHR-capable uplink transmission resources comprises:
when uplink transmission resources supporting the PHR exist on the component carrier triggering the PHR, selecting at least one component carrier to carry out PHR transmission; or,
when at least one component carrier has uplink transmission resources supporting PHR, at least one component carrier is selected for PHR transmission.
8. The method of claim 7,
selecting a component carrier for PHR transmission when uplink transmission resources supporting PHR exist on the component carrier, wherein the PHR transmission comprises the following steps: setting a component carrier index corresponding to the sent PH, and sending the component carrier index and the PH on a component carrier; and/or the presence of a gas in the gas,
selecting a component carrier for PHR transmission when uplink transmission resources supporting PHR exist on the component carrier, wherein the selecting the component carrier for PHR transmission comprises: transmitting a PH on a component carrier; or, a combined PH obtained by organizing a plurality of PHs according to a set rule is sent on one component carrier; or, one PH is respectively transmitted through at least one component carrier, and a combined PH obtained by organizing a plurality of PHs according to a set rule is also transmitted through at least one component carrier, where the component carrier transmitting one PH is different from the component carrier transmitting the combined PH; and/or the presence of a gas in the gas,
the selecting component carrier for PHR transmission is to select one component carrier to transmit multiple PHs, where the transmitting the PHs includes: and organizing the PHs according to a set rule to obtain a combined PH, and sending the combined PH on the component carrier.
9. The method of claim 8,
the set rule is as follows: pre-configured by the eNB to the UE; or sending a dedicated signaling to the UE through the eNB for providing to the UE; and/or the presence of a gas in the gas,
the set rule is as follows: setting an arrangement rule of each PH, or an arrangement rule of a component carrier index and a PH corresponding to a component carrier, or an arrangement rule of a PHR identifier and a PH corresponding to a component carrier.
10. The method according to any of claims 1 to 9, wherein the logical channel identity LCID used for identifying the PHR in the multi-carrier case takes values as:
a newly set value that is not within the range of the existing LCID value; or,
a value selected from the existing LCID reserved value interval; or,
there are LCID values that are used to identify the PHR.
11. The method of claim 10, wherein when the existing LCID value for identifying the PHR is used to identify the PHR in the multi-carrier case, the performing PHR transmission further includes:
the eNB informs the UE of the PHR under the condition of multi-carrier currently; or,
the UE determines that the PHR is carried out under the condition of multiple carriers according to the self capability information, and the eNB determines that the PHR carried out by the UE is under the condition of multiple carriers according to the capability information of the UE.
12. A terminal for realizing power headroom report, the terminal supports carrier aggregation technology, characterized in that the terminal comprises: a determining unit and a reporting unit, wherein,
the determining unit is configured to determine one or more PHs for component carriers allocated to a UE;
the reporting unit is configured to select at least one component carrier of an uplink for PHR transmission.
13. The terminal of claim 12, wherein the reporting unit is specifically configured to: selecting to send a PH on at least one component carrier with uplink transmission resources supporting PHR, wherein the sent PHR corresponding to the PH at least comprises a triggered PHR.
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