WO2013120442A1

WO2013120442A1 - Method and device for reporting power headroom

Info

Publication number: WO2013120442A1
Application number: PCT/CN2013/071533
Authority: WO
Inventors: 许芳丽; 赵亚利
Original assignee: 电信科学技术研究院
Priority date: 2012-02-16
Filing date: 2013-02-07
Publication date: 2013-08-22
Also published as: CN102573032A; CN102573032B

Abstract

The embodiments of the present invention relate to the technical field of wireless communications, and in particular, to a method, system and device for reporting power headroom, which are used to achieve the reporting of power headroom at the moment when the PRACH is concurrent with the PUSCH and/or PUCCH. The method provided in the embodiments of the present invention comprises: user equipment determining a power headroom value corresponding to each cell which transmits the physical uplink channel after determining that there is a need to concurrently transmit preamble and the physical uplink channel at the moment of reporting power headroom; and the user equipment reporting the determined power headroom value. Since power headroom can be reported at the moment when the PRACH is concurrent with the PUSCH and/or PUCCH, the power distribution conditions of the user equipment at the concurrent moment can be indicated to the network side to provide a basic assurance for the uplink power distribution on the network side, improving system performance.

Description

Method and device for reporting power headroom This application claims to be submitted to the Chinese Patent Office on February 16, 2012, with the application number 201210035412.X, and the invention name is

The priority of the Chinese Patent Application, which is incorporated herein by reference. The present invention relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for reporting power headroom. BACKGROUND OF THE INVENTION In the current Long Term Evolution (LTE) system, there can be only one carrier in a cell and the maximum bandwidth is 20 MHz. For the LTE-Advanced (LTE-A) system, the peak rate of the LTE-A system is greatly improved compared with the LTE system. The LTE-A system requires downlink lGbps and uplink 500 Mbps. Obviously, the bandwidth of 20Mhz can no longer meet this demand. In order to enable the LTE-A system to meet the requirements, Carrier Aggregation (CA) technology is introduced.

The carrier aggregation technology is that the terminal can work simultaneously on multiple cells. The cells may be continuous or discontinuous in the frequency domain, and the bandwidth of each cell may be the same or different. To maintain compatibility with LTE systems, the maximum bandwidth limit per cell is 20 MHz. At present, it is generally considered that a terminal aggregates a maximum of five cell formats. In addition, based on different cells may support different functions, the LTE-A system also classifies the cells aggregated by the terminal, and is divided into:

Primary Cell (PCell): The terminal aggregates only one cell of the multiple cells is defined as a PCell. The PCell is selected by the base station and configured to the terminal by Radio Resource Control (RRC) signaling. Only the Physical Uplink Control Channel (PUCCH) is configured on the PCell.

Secondary Cell (SCell): All cells except PCell in all cells aggregated by the terminal are SCelL

LTE-A version 10 (R10) supports only a single TA scenario, that is, the TAs of all cells aggregated by the terminal (UE) are the same. LTE-AR11 introduces a multi-TA scenario, that is, all cells TA aggregated by the UE may be different.

The power headroom report (PHR) defined in the LTE-A R10 needs to report the Power Headroom (PH) information on the configured and activated cell, that is, once the PHR is triggered, all configured and activated cells The PH information on the package is reported together.

The process of non-contention random access in LTE system is mainly divided into three steps:

The Msgl and the base station allocate a dedicated random access preamble (R-Preamblelndex) for non-contention random access and a physical random access channel (Physical Random) used for random access to the UE. Access Channel, PRACH) The PRACH Mask Index (Ra-PRACH-Masklndex), which carries the information on the Physical Downlink Control Channel (PDCCH) for non-contention random access caused by the arrival of downlink data. The non-contention random access caused by the handover carries the information through Radio Resource Control (RRC) signaling.

Msg2, UE is based on the ra-Preamblelndex and ra-PRACH-Masklndex indicated by Msgl, in the specified

A designated dedicated preamble (preamble) is transmitted to the base station on the PRACH resource. After receiving the Msg2, the base station calculates the uplink timing advance TA according to Msg2.

The base station sends a random access response to the UE. The random access response includes timing advance information and a subsequent uplink resource allocation uplink grant (UL grant), and the timing advance is used for the timing relationship of the UE subsequent uplink transmission. The PDCCH carrying the Msg3 scheduling message is scrambled by the Random Access-Radio Network Temporary Identifier (RA-RNTI), and the RA-RNTI uniquely corresponds to the time-frequency resource of the Msg2 in the 10ms window; The Msg3 also carries a preamble ID, and the UE determines, by the RA-RNTI and the preamble ID, that the Msg3 corresponds to the Msg2 sent by the Msg3.

In the LTE-A Rell-11 system, PCell and SCell will appear in order to support carrier aggregation in different uplink frequency bands and carrier aggregation deployment schemes in which macro e B and Remote Radio Head (RRH) are mixed. When the signal paths are different and the propagation time is different, SCell needs to independently establish and maintain uplink synchronization with the base station. The uplink synchronization of the SCell is implemented by a random access (RA) process. In the SCell random access procedure, there may be a physical uplink shared channel (PUSCH) and/or physics on other serving cells. The Physical Uplink Control Channel (PUCCH) transmission, that is, the case where the random access procedure on the SCell and the PUCCH and/or PUSCH on other cells are concurrent. In the current PHR process, only the PUSCH/PUCCH parallel transmission is considered, and the case of PUCCH and/or PUSCH and PRACH concurrency is not considered.

In summary, there is currently no scheme for power headroom at the time of PRACH and PUSCH and/or PUCCH concurrency. SUMMARY OF THE INVENTION A method and device for reporting power headroom according to an embodiment of the present invention are used to implement a power headroom at a concurrent time of PRACH and PUSCH and/or PUCCH.

A method for reporting a power headroom according to an embodiment of the present invention includes:

After determining that the preamble and the physical uplink channel need to be transmitted concurrently, the user equipment determines a power headroom value corresponding to each cell that transmits the physical uplink channel;

The user equipment reports the determined power headroom value. A method for power adjustment according to an embodiment of the present invention includes:

The network side device receives the power headroom value reported by the user equipment, where the power headroom value is determined by the user equipment after the preamble and the physical uplink channel need to be concurrently transmitted on the determined power headroom;

The network side device adjusts the uplink power according to the power headroom value.

The user equipment reported by the power headroom according to the embodiment of the present invention includes:

a remaining value determining module, configured to determine a power headroom value corresponding to each cell that transmits the physical uplink channel after determining that there is a preamble at the time of reporting the power headroom and that the physical uplink channel needs to be concurrently transmitted;

The reporting module is used to determine the power headroom value.

A network side device for power adjustment according to an embodiment of the present invention includes:

a receiving module, configured to receive a power headroom value reported by the user equipment, where the power headroom value is determined by the user equipment after the preamble and the physical uplink channel need to be concurrently transmitted after determining the power headroom reporting time;

The adjusting module is configured to adjust the uplink power according to the power headroom value.

Since the power headroom can be performed at the time of the PRACH and the PUSCH and/or the PUCCH, it is possible to indicate the power allocation of the user equipment to the network side at the concurrent time, and provide the basic guarantee for allocating the uplink power to the network side, thereby improving the system. performance. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic structural diagram of a system for reporting a power headroom according to an embodiment of the present invention;

2 is a schematic structural diagram of user equipment in a system for reporting power headroom according to an embodiment of the present invention;

3 is a schematic structural diagram of a network side device in a system with power headroom according to an embodiment of the present invention;

4 is a schematic flowchart of a method for performing power headroom reporting by a user equipment according to an embodiment of the present invention;

FIG. 5 is a schematic flowchart of a method for receiving a power headroom by a network side device according to an embodiment of the present invention;

6 is a schematic diagram of a format of a first PHR MAC CE according to an embodiment of the present invention;

7 is a schematic diagram of a format of a second PHR MAC CE according to an embodiment of the present invention;

8 is a schematic diagram of a format of a third PHR MAC CE according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a format of a fourth PHR MAC CE according to an embodiment of the present invention. In the embodiment of the present invention, after determining that the preamble and the physical uplink channel need to be concurrently transmitted, the user equipment determines the power headroom value corresponding to each cell that transmits the physical uplink channel. Since the power headroom can be performed at the time of the PRACH and the PUSCH and/or the PUCCH, it is possible to indicate the power allocation of the user equipment to the network side at the concurrent time, and provide the basic guarantee for allocating the uplink power to the network side, thereby improving the system. performance. In the LTE-A system, the PH is calculated and reported based on the serving cell. If there is a PHR trigger on a serving cell, the PH information on all configured and activated cells needs to be reported, and the activated cell does not necessarily have real PUSCH and/or PUCCH transmission. Therefore, LTE-A introduces virtual (virtual). ) PUCCH format and virtual PUSCH format. When there is no real-transmitted PUCCH and/or PUSCH on an activated cell, the PH value on the cell can be calculated in the format of the virtual PUCCH and/or the virtual PUSCH. For details, refer to the 3GPP 36.213 protocol.

The transmitting physical uplink channel of the embodiment of the present invention includes some or all of the following channels:

PUSCH and PUCCH.

The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

In the following description, the implementation of the cooperation between the network side and the user equipment side will be described first. Finally, the implementations from the network side and the user equipment side will be described separately, but this does not mean that the two must be implemented together. In fact, When the network side is implemented separately from the user equipment side, the problems existing on the network side and the user equipment side are also solved, but when the two are combined, a better technical effect is obtained.

As shown in FIG. 1, the system for reporting the power headroom in the embodiment of the present invention includes: a user equipment 10 and a network side device 20. The user equipment 10 is configured to determine, according to the determined power headroom, that the preamble and the physical uplink channel need to be concurrently transmitted, determine a power headroom value corresponding to each cell that transmits the physical uplink channel, and determine the power remaining amount of the cell. The network side device 20 is configured to receive a power headroom value reported by the user equipment, and adjust the uplink power according to the power headroom value.

In an implementation, the user equipment 10 may select a power headroom value corresponding to a cell that transmits a preamble or a cell that does not report a cell that transmits a preamble, in addition to a power headroom value corresponding to a cell that transmits a physical uplink channel. The power headroom value is described below.

The power headroom value corresponding to the cell of the preamble is transmitted.

Specifically, before the determined power headroom value, the user equipment 10 determines the power headroom value corresponding to the cell transmitting the preamble, and then selects all the power headroom values determined at the time of the power headroom.

The power headroom reporting time in the reporting mode 1 is a preamble and the physical uplink channel needs to be concurrently transmitted.

In an implementation, the power headroom value corresponding to the cell transmitting the preamble may be determined according to one of the following manners. Determining Mode 1: The user equipment 10 determines the power headroom value corresponding to the cell transmitting the preamble according to the formula 1: the power headroom value corresponding to the cell transmitting the preamble=

_ [Preamble_received_target_power + PLc+(Npreamble - 1) ^x dP_rampup]...Formula 1;

Wherein, ^P CMAX, c) is the available maximum uplink transmit power of the user equipment configuration (i.e., transmission _p reamble cells) in the serving cell, Preamble_received_target_power is a configuration of the user equipment uplink preamble desired receive power, PLc that the cell ( That is, the downlink path loss of the user equipment in the cell in which the preamble is transmitted, Npreamble It is the number of times the preamble is transmitted during the random access process, and dP reampup is the power value that the preamble needs to increase each time it retransmits.

Preferably, determining the maximum power backoff value of ^P CMAX W is determined based on the transmission condition at the concurrent time.

For the method of determining ^PcMAX , ^c ( ^Z ) according to the maximum power backoff value, refer to the 3GPP 36.101 protocol, and details are not described herein again.

Preferably, the maximum power backoff value used in the actual power headroom of each serving cell is determined according to all physical uplink channel transmission conditions.

The serving cell that reports the actual power headroom refers to a cell that has actual PUCCH transmission, a cell that has actual PUSCH transmission, and/or a cell that transmits a preamble.

Preferably, when the user equipment 10 determines the maximum power backoff value according to the preamble transmission condition, the power headroom value corresponding to the preamble may also be identified when the power headroom value is determined. . Thus, when the network side device 20 knows that the maximum power backoff value calculation of the transmission includes the preamble transmission information, when the subsequent preamble and the physical uplink channel are concurrently transmitted, the MPR information at the moment is referred to for subsequent Power allocation. That is to say, the user equipment 10 can also report the information for notifying the presence of the preamble at the time of reporting the power headroom with all the determined power headroom values.

For determining mode 1, when the preamble and the physical uplink channel are simultaneously transmitted, the network side device 20 allocates, according to the maximum power backoff value of the preamble transmission and the physical uplink channel transmission, the preamble transmission corresponding to the cell of the received transmission preamble. The power headroom value is allocated for the physical uplink channel based on the remaining power. That is to say, when the subsequent preamble and the physical uplink channel may be simultaneously transmitted, the network side device 20 reuses the power of the physical uplink channel after the power of the preamble transmission is guaranteed.

Determination mode 2: The user equipment 10 determines, according to the virtual physical uplink channel, a power headroom value corresponding to the cell that transmits the preamble. The transmission power of the preamble is not considered in the second method.

For determining mode 2, if the maximum power backoff value information considered in the physical uplink channel transmission considers the preamble transmission situation, the network side device 20 performs uplink power allocation in the uplink scheduling at the time when the subsequent preamble and the physical uplink channel are transmitted in parallel. The power scheduling is performed according to the information reflected in the power headroom; otherwise, if the maximum power backoff value does not include the preamble transmission, when the subsequent network side device 20 performs the physical uplink channel transmission, the situation is reflected according to the transmission. Perform subsequent uplink scheduling and power allocation.

Preferably, for determining mode 2, the user equipment 10 may also report the information for notifying the presence of the preamble at the time of reporting the power headroom with all the determined power headroom values.

The information used to notify the presence of the preamble at the time of reporting the power headroom may be a bitmap. Ratio: 3⁄4 port "1" means there is a preamble; "0" does not exist preamble.

Correspondingly, if the received power headroom value includes a power headroom value corresponding to the cell transmitting the preamble, and the power headroom value corresponding to the cell transmitting the preamble is determined according to the virtual physical uplink channel, when the power headroom calculation is used The maximum power backoff value does not take into account the preamble transmission. When the network side device 20 performs physical uplink channel transmission on each subsequent serving cell, the power allocation is performed according to the virtual power margin; when the power headroom calculation uses the maximum power backoff When the preamble transmission is considered, the network side device adjusts the uplink power according to the maximum power backoff information MPR in the power headroom value reported by the user equipment when the preamble and the physical uplink channel are simultaneously transmitted.

Since the MPR situation reflects the power backoff information caused by the preamble and the physical uplink channel transmission concurrency moment, when the preamble and the physical uplink channel are simultaneously transmitted again, the MPR information is used for subsequent power allocation.

It should be noted that the maximum power backoff value used when determining the actual power headroom on the serving cell based on all physical uplink channel transmission conditions is applicable not only to the first determination method described above, but also to the second determination. In the mode, the maximum power backoff value information considered in the physical uplink channel transmission considers the preamble transmission situation. Specifically, the maximum power backoff value used when each serving cell that transmits the physical uplink channel reports the actual power headroom is based on All physical uplink channel transmission conditions are determined.

The reporting mode 2 does not report the power headroom value corresponding to the cell that transmits the preamble.

Specifically, the user equipment 10 determines the power headroom value corresponding to the cell that transmits the physical uplink channel on the next uplink subframe where the preamble does not exist, and then the user equipment 10 passes the next uplink subframe that does not have the preamble, and the upper 4所有 All power headroom values determined. In other words, push back to the next available uplink subframe (that is, the uplink subframe where there is no preamble) and then the power headroom value.

The next uplink subframe in which the next preamble does not exist is the next uplink subframe in which the preamble does not exist with respect to the preamble and the physical uplink channel concurrent transmission time.

In the implementation, the specific method (including the determining mode and the reporting mode) may be specified in the protocol, or may be notified to the user equipment side by the network side, and may also be determined by the network side and the user equipment side.

The network side device in the embodiment of the present invention may be a station (such as a macro base station, a home base station, etc.), a relay (RN) device, or other network side devices.

As shown in FIG. 2, the user equipment in the system for reporting power headroom according to the embodiment of the present invention includes: a residual value determining module 200 and an upper module 210.

The remaining value determining module 200 is configured to determine a power headroom value corresponding to each cell that transmits the physical uplink channel after determining that there is a preamble at the time of reporting the power headroom and that the physical uplink channel needs to be transmitted concurrently;

The reporting module 210 is configured to report the determined power headroom value.

Preferably, the remaining value determining module 200 is further configured to: determine a power headroom value corresponding to the cell that transmits the preamble. Preferably, the remaining value determining module 200 determines the power headroom value corresponding to the cell transmitting the preamble according to the formula 1. Preferably, the remaining value determining module 200 determines a power headroom value corresponding to the cell transmitting the preamble according to the virtual physical uplink channel.

Preferably, if it is required to determine the maximum power backoff value according to the Preamble transmission condition, the remaining value determining module 200 further For: reporting the information indicating that the preamble exists at the time of reporting the power headroom and all the determined power headroom values.

Preferably, the reporting module 210 reports all the determined power headroom values at the power headroom reporting time.

Preferably, the remaining value determining module 200 determines a power headroom value corresponding to each cell that transmits the physical uplink channel on the next uplink subframe where the preamble does not exist;

Correspondingly, the reporting module 210 reports all the determined power headroom values through the next uplink subframe in which the preamble does not exist.

As shown in FIG. 3, the network side device in the system for reporting power headroom according to the embodiment of the present invention includes: a receiving module 300 and an adjusting module 310.

The receiving module 300 is configured to receive a power headroom value reported by the user equipment, where the power headroom value is determined by the user equipment after the preamble and the physical uplink channel need to be concurrently transmitted on the determined power headroom;

The adjusting module 310 is configured to adjust the uplink power according to the power headroom value.

Preferably, if the received power headroom value includes a power headroom value corresponding to the cell transmitting the preamble, and the power headroom value corresponding to the cell transmitting the preamble is determined according to the formula 1, the adjusting module 310 is in the preamble and the physical uplink channel. At the same time, according to the maximum power backoff value when the Preamble transmission and the physical uplink channel are transmitted, the preamble transmission allocates a power headroom value corresponding to the cell of the received transmission preamble, and allocates the physical uplink channel according to the remaining power. .

Preferably, if the received power headroom value includes a power headroom value corresponding to the cell transmitting the preamble, and the power headroom value corresponding to the cell transmitting the preamble is determined according to the virtual physical uplink channel, the adjustment module 310 is the power remaining. The maximum power backoff value used for the quantity calculation does not consider the Preamble transmission. When the physical uplink channel transmission is performed on each subsequent serving cell, the power allocation is performed according to the virtual power margin; when the power headroom calculation uses the maximum power backoff When the value is considered to be Preamble transmission, when the preamble and the physical uplink channel are simultaneously transmitted, the uplink power is adjusted according to the maximum power backoff information MPR in the power headroom value of the user equipment.

Based on the same inventive concept, a method for performing power headroom reporting by a user equipment is also provided in the embodiment of the present invention. The principle of solving the problem and the user equipment in the power headroom of the embodiment of the present invention are provided. Similarly, the implementation of the method can be referred to the implementation of the method, and the repeated description will not be repeated.

As shown in FIG. 4, the method for performing power headroom reporting by the user equipment in the embodiment of the present invention includes the following steps: Step 401: After the user equipment determines that the power headroom has a preamble and the physical uplink channel needs to be concurrently transmitted, determine that each a power headroom value corresponding to a cell transmitting a physical uplink channel;

Step 402: The user equipment reports the determined power headroom value.

In an implementation, the user equipment 10 may select a power headroom value corresponding to a cell that transmits a preamble or a cell that does not report a cell that transmits a preamble, in addition to a power headroom value corresponding to a cell that transmits a physical uplink channel. The power headroom value is described below. Up·ί艮 Method 1. The power margin value corresponding to the cell in which the preamble is transmitted.

Specifically, in step 401, the user equipment determines a power headroom value corresponding to the cell that transmits the preamble; and in step 402, all the power headroom values determined in the power headroom.

In an implementation, the power headroom value corresponding to the cell transmitting the preamble may be determined according to one of the following manners. Determination mode 1. The user equipment determines the power headroom value corresponding to the cell transmitting the preamble according to the formula 1. Preferably, determining the maximum power backoff value of ^P CMAX W is determined based on the transmission condition at the concurrent time.

Preferably, when the user equipment determines the maximum power backoff value according to the Preamble transmission condition, the power headroom value corresponding to the preamble may be identified when the determined power headroom value is reported. In this way, when the network side device knows that the maximum power backoff value calculation of the transmission includes the information of the Premable transmission, when the subsequent Preamble and the physical uplink channel are transmitted, the MPR information at the moment is referred to the subsequent power. distribution.

Determination mode 2: The user equipment determines, according to the virtual physical uplink channel, a power headroom value corresponding to the cell that transmits the preamble.

Preferably, for determining mode 2, the user equipment may also report the information for notifying that the preamble exists at the power headroom reporting time together with all the determined power headroom values.

Specifically, the user equipment determines, on the next uplink subframe where the preamble does not exist, the power headroom value corresponding to each cell that transmits the physical uplink channel, and then determines all the uplink subframes that are not in the preamble. Power headroom value. That is, push back to the next available uplink subframe (ie, the uplink subframe where there is no preamble) and then the power headroom value.

Based on the same inventive concept, the embodiment of the present invention further provides a method for receiving a power headroom report by a network side device, and the principle of solving the problem is similar to the network side device in the system for reporting power headroom according to the embodiment of the present invention. Therefore, the implementation of the method can be referred to the implementation of the method, and the repeated description will not be repeated.

As shown in FIG. 5, the method for receiving a power headroom by the network side device according to the embodiment of the present invention includes the following steps: Step 501: The network side device receives a power headroom value reported by the user equipment, where the power headroom value is determined by the user equipment. The preamble and the physical uplink channel need to be determined after concurrent transmission.

Step 502: The network side device adjusts the uplink power according to the power headroom value.

Preferably, if the received power headroom value includes a power headroom value corresponding to the cell that transmits the preamble, and the power headroom value corresponding to the cell that transmits the preamble is determined according to formula 1, the network side device is in the preamble in step 502. When transmitting simultaneously with the physical uplink channel, according to the maximum power backoff value when the Preamble transmission and the PUSCH/PUCCH transmission are performed, the preamble transmission is allocated a power headroom value corresponding to the cell of the received transmission preamble, and is based on the remaining power. The uplink channel is allocated.

Preferably, if the received power headroom value includes a power headroom value corresponding to the cell transmitting the preamble, and the power headroom value corresponding to the cell transmitting the preamble is determined according to the virtual physical uplink channel, in step 502, when the power is The maximum power backoff value used for the remainder calculation does not consider the Preamble transmission. When the network device performs physical uplink channel transmission on each subsequent serving cell, the power allocation is performed according to the virtual power margin; The maximum power backoff value is used to adjust the uplink power according to the maximum power backoff information MPR in the power headroom value reported by the user equipment when the preamble and the physical uplink channel are simultaneously transmitted. .

The scheme of the present invention will be described below by way of five examples.

Example 1: Assumption: One PCell and one SCell are configured for the UE, and the PHell is triggered on the PCell. The pre-mble transmission is also performed on the SCell.

1. At time t, there is a new PUSCH transmission on the PCell and the PH reporting condition is met, and the Preamble transmission is performed on the SCell at the same time;

2. The UE uses Equation 1 to determine the power headroom value corresponding to the SCell, and adds the power headroom value corresponding to the SCell in the extended PHR MAC CE, wherein the corresponding PHR MAC CE format is as shown in FIG. 6, wherein the PHR of FIG. 6 The new parts in the MAC CE can be found in bold type. The physical meanings of the remaining parts can be found in the 3GPP 36.321 protocol.

After receiving the extended PHR MAC CE, the e B obtains the power headroom on the SCell. When the subsequent preamble is transmitted simultaneously with the PUSCH and/or the PUCCH, the pre-preserved power of the preamble is first guaranteed, and the remaining power is used for the PUSCH and / or PUCCH for allocation.

Example 2: Assume that one PCell and one SCell are configured for the UE, and the PHell is triggered on the PCell. The pre-mble transmission is also performed on the SCell.

2. The UE determines the power headroom value corresponding to the SCell according to the virtual physical uplink channel, and adds the power headroom value corresponding to the SCell in the extended PHR MAC CE, where the corresponding PHR MAC CE format is as shown in FIG. 7, where FIG. 7 The new parts of the PHR MAC CE are shown in bold, and the physical meanings of the remaining parts can be found in the 3GPP 36.321 protocol;

3. After receiving the extended PHR MAC CE, the eNB obtains the power headroom on the SCell, and considers the maximum power backoff value information considered in the physical uplink channel transmission when the subsequent preamble is simultaneously transmitted with the PUSCH and/or the PUCCH. In the case of Preamble transmission, when uplink scheduling is performed for uplink power allocation, power scheduling needs to be performed according to the information reflected in the power headroom. If the maximum power backoff value does not include the Preamble transmission, then In the uplink scheduling of the uplink preamble concurrent time, power scheduling is performed according to the information reflected in the power headroom.

Example 3: Assumption: One PCell and one SCell are configured for the UE, and the PHell is triggered on the PCell. The pre-mble transmission is performed on the SCell.

2. The UE determines the power headroom value corresponding to the SCell according to the virtual physical uplink channel, and adds the power headroom value corresponding to the SCell and the preamble information for notifying the power headroom at the 4th time in the extended PHR MAC CE, where The corresponding PHR MAC CE format is shown in Figure 8 or Figure 9. The new parts in the PHR MAC CE in Figure 8 and Figure 9 are shown in bold. The physical meanings of the remaining parts can be found in the 3GPP 36.321 protocol.

3. After receiving the extended PHR MAC CE, the e B obtains the power headroom on the SCell, and when the subsequent preamble is simultaneously transmitted with the PUSCH and/or the PUCCH, the information indicating that the preamble exists at the time of the power headroom is notified. The power allocation corresponding to the PHR is identified as preamble transmission, and the MPR calculated according to the calculation is reserved. When the subsequent preamble is simultaneously transmitted with the PUSCH and/or the PUCCH, the MPR is used for power allocation.

Example 4: PeriodicPHR-Timer timeout, the uplink PUSCH new transmission occurs in the subframe t, but the preamble transmission occurs in the subframe t, the PHR report is not triggered at present, and the PHR is performed when there is no preamble transmission at the new PUSCH transmission moment. Reported.

Example 5: The prohibit PHR-Timer expires or has timed out. When the path loss on the activated serving cell exceeds the dl-PathlossChange dB, the UE has uplink new data transmission. If there is a preamble transmission at this time, the PHR does not trigger at the moment. The PHR is triggered until the subsequent time, that is, the UE has uplink new data transmission and the path loss change still exceeds the threshold, and the current subframe has no preamble transmission.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present invention can be embodied in the form of a computer program product embodied on one or more computer-usable storage interfaces (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart. The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the preferred embodiment of the invention has been described, it will be apparent to those of ordinary skill in the art that <RTIgt; Therefore, the appended claims are intended to be construed as including the preferred embodiments and the modifications

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

Rights request

A method for power headroom, characterized in that the method comprises:

Determining, by the user equipment, that the preamble preamble and the physical uplink channel need to be concurrently transmitted after determining the power headroom, determining a power headroom value corresponding to each cell that transmits the physical uplink channel;

The user equipment reports the determined power headroom value.

2. The method according to claim 1, wherein the user equipment reports the determined power headroom value before:

The user equipment determines a power headroom value corresponding to a cell that transmits the preamble.

3. The method according to claim 2, wherein the user equipment determines a power headroom value corresponding to a cell that transmits the preamble according to the following formula:

The power balance value corresponding to the small area of the transmitted preamble = ^CMAX ) _

[Preamble_received_target_power + PLc+(Npreamble - 1) ^x dP rampup];

Wherein, ^P CMAX, c) is the maximum available transmit power of the uplink user equipment is configured to transmit the _preamble in the cell, Preamble_received_target_power configure the user equipment is expected uplink preamble receive power, PLc transmission of the preamble is the user cell The downstream path loss of the device. The Npreamble is the number of times the preamble is transmitted during the random access process. The dP reampup is the power value that the preamble needs to increase each time it retransmits.

The method according to claim 2, wherein the determining, by the user equipment, the power headroom value corresponding to the cell that transmits the preamble includes:

The user equipment determines, according to the virtual physical uplink channel, a power headroom value corresponding to the cell that transmits the preamble.

5. The method of claim 3, wherein determining the maximum power backoff value of ^PcMAX , ^c( ) is determined based on the transmission condition at the concurrent time.

The method of claim 2, wherein the maximum power backoff value used by each serving cell to report the actual power headroom is determined according to all physical uplink channel transmission conditions.

The method according to claim 2, wherein the reporting, by the user equipment, the power headroom value further comprises: if the maximum power backoff value needs to be determined according to the preamble transmission condition, the user equipment is used to notify the power balance The information of the preamble at the time of the quantity reporting is reported together with all the determined power headroom values.

The method according to any one of claims 1 to 7, wherein the determining, by the user equipment, the determined power headroom value comprises:

The user equipment reports all the determined power headroom values at the time of reporting the power headroom.

The method of claim 1, wherein the determining, by the user equipment, the power headroom value comprises: determining, by the user equipment, that each of the physical uplink channels is transmitted on an uplink subframe that does not have a preamble The power headroom value corresponding to the cell;

The determined power headroom value reported by the user equipment includes:

The user equipment passes all the power headroom values determined by the next uplink subframe in which the preamble does not exist.

10. A method of power adjustment, characterized in that the method comprises:

The method according to claim 10, wherein the adjusting, by the network side device, the uplink power comprises:

If the received power headroom value includes a power headroom value corresponding to the cell that transmits the preamble, and the power headroom value corresponding to the cell that transmits the preamble is determined according to the following formula, the network side device transmits the preamble and the physical uplink channel simultaneously. And assigning, according to the maximum power backoff value of the preamble transmission and the physical uplink channel transmission, a power headroom value corresponding to the cell of the received transmission preamble for the preamble transmission, and allocating the physical uplink channel according to the remaining power;

The power headroom value corresponding to the cell transmitting the preamble=

_ [Preamble_received_target_power + PLc+(Npreamble - 1) ^x dP rampup];

^CMAX,c) is the maximum uplink transmit power available to the user equipment configured on the serving cell,

Preamble_received_target_power is the uplink preamble expected to receive the user equipment, PLc is the downlink loss of the user equipment in the cell, Npreamble is the number of times the preamble is transmitted during the random access process, and dP reampup is the power value that the preamble needs to increase each retransmission. .

12. The method of claim 11 wherein determining a maximum power backoff value for ^PcMAX , ^c( ) is determined based on a transmission condition at a concurrent time.

If the received power headroom value includes a power headroom value corresponding to the cell that transmits the preamble, and the power headroom value corresponding to the cell that transmits the preamble is determined according to the virtual physical uplink channel, when the power headroom calculates the maximum power used The rollback value does not consider the preamble transmission. When the network device performs physical uplink channel transmission on each subsequent serving cell, the power allocation is performed according to the virtual power margin; when the power headroom calculation uses the maximum power backoff value, the Preamble is considered. During transmission, the network side device adjusts the uplink power according to the maximum power backoff information MPR in the power headroom value reported by the user equipment when the preamble and the physical uplink channel are simultaneously transmitted.

14. A user equipment reported by a power headroom, wherein the user equipment comprises:

a residual value determining module, configured to: present a preamble and a physical uplink channel at a time when determining a power headroom After transmitting the transmission, determining a power headroom value corresponding to each cell that transmits the physical uplink channel;

The reporting module is used to determine the power headroom value.

The user equipment according to claim 14, wherein the remaining value determining module is further configured to: determine a power headroom value corresponding to the cell that transmits the preamble.

The user equipment according to claim 15, wherein the remaining value determining module determines a power headroom value corresponding to a cell transmitting the preamble according to the following formula:

Power headroom value corresponding to the cell transmitting the preamble=

_ [Preamble_received_target_power + PLc+(Npreamble - 1) ^x dP rampup];

The CMAX, _C ) is the maximum uplink transmit power that is configured by the user equipment on the serving cell, the Preamble_received_target_power is the uplink preamble expected receiving power of the user equipment, and the PLc is the downlink path loss of the user equipment in the cell, and the Npreamble is The number of times the preamble is transmitted during the random access process. dP reampup is the power value that the preamble needs to increase each time it retransmits.

The user equipment according to claim 15, wherein the remaining value determining module is specifically configured to: determine, according to the virtual physical uplink channel, a power headroom value corresponding to the cell that transmits the preamble.

The user equipment according to claim 15, wherein the remaining value determining module is further configured to: if the maximum power backoff value needs to be determined according to the Preamble transmission condition, it is used to notify the power headroom of 4艮The information of the preamble at the moment is reported together with all the determined power headroom values.

The user equipment according to any one of claims 14 to 18, wherein the reporting module is configured to: report all the power headroom values determined at the time of reporting the power headroom.

The user equipment according to claim 14, wherein the remaining value determining module is specifically configured to: determine, according to an uplink subframe where the preamble does not exist, a power corresponding to each cell that transmits the physical uplink channel. Balance value

The upper block is specifically used for:

All the determined power headroom values are reported by the next uplink subframe in which the preamble does not exist.

A network-side device for power adjustment, characterized in that the method comprises:

The network side device according to claim 21, wherein the adjusting module is specifically configured to: if the received power headroom value includes a power headroom value corresponding to a cell that transmits a preamble, and transmit a preamble cell The corresponding power headroom value is determined according to the following formula. When the preamble and the physical uplink channel are simultaneously transmitted, according to the maximum power backoff value when the Preamble transmission and the physical uplink channel are transmitted, the preamble transmission is allocated not less than the received transmission preamble. The power headroom value corresponding to the cell, and divides the physical uplink channel according to the remaining power. Match

The power headroom value corresponding to the cell transmitting the preamble = ^CMAX ) _ [Preamble_received_target_power + PLc+(Npreamble - 1) ^x dP rampup];

The network side device according to claim 21, wherein the adjusting module is specifically configured to: if the received power headroom value includes a power headroom value corresponding to a cell that transmits a preamble, and transmit a preamble cell The corresponding power headroom value is determined according to the virtual physical uplink channel. When the power headroom calculation uses the maximum power backoff value, the Preamble transmission is not considered, and when the physical uplink channel transmission is performed on each subsequent serving cell, according to the virtual power. The remaining power is used for the power allocation; when the maximum power backoff value used for the power headroom calculation considers the Preamble transmission, when the preamble and the physical uplink channel are simultaneously transmitted, according to the maximum power back in the power headroom value reported by the user equipment The back information MPR adjusts the uplink power.