CN105766034B

CN105766034B - A kind of power headroom reporting (PHR) method and device of cooperative multi-point communication

Info

Publication number: CN105766034B
Application number: CN201380002597.7A
Authority: CN
Inventors: 张健; 曾清海; 黄曲芳
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2013-03-28
Filing date: 2013-03-28
Publication date: 2019-09-13
Anticipated expiration: 2033-03-28
Also published as: CN105766034A

Abstract

The embodiment of the invention discloses the power headroom reporting (PHR) methods and device of a kind of communication of cooperative multi-point；Wherein, which comprises user equipment obtains the uplink coordinated multiple spot CoMP measuring assembly of serving BS configuration, and the uplink CoMP measuring assembly includes the measurement configuration information of receiving point RP；The user equipment estimates downlink path loss according to the uplink CoMP measuring assembly；The user equipment generates power headroom reporting (PHR) PHR according to the downlink path loss and the PHR is reported to the serving BS.Using the method and apparatus of the present embodiment, family equipment can be used and more accurately estimate downlink path loss, PUSCH/PUCCH transmission power and PH, and then more accurately distribute ascending resource, reduce interference and improves uplink throughput.

Description

Power headroom reporting method and device for coordinated multi-point communication

Technical Field

The present invention relates to the field of mobile communications technologies, and in particular, to a Power Headroom Report (PHR) method and apparatus for coordinated multi-point (CoMP) communications.

Background

In the third Generation partnership Project (3 GPP), Long Term Evolution (LTE) and long term evolution advanced (LTE-a), the power headroom reporting process refers to a User Equipment (User Equipment) reporting difference information between a nominal User Equipment maximum transmit power on a serving cell and an estimated transmit power on an uplink shared channel (UL-SCH) of each active state to a serving base station (serving base station), and in the power headroom reporting process, the User Equipment also reports difference information between the nominal User Equipment maximum transmit power on a primary serving cell (PCell) and the estimated transmit powers on the uplink shared channel and a physical uplink control channel (pucch) to the serving base station.

However, with the development of mobile communication technology, cooperative multipoint communication technology is more and more widely adopted; the coordinated multi-point communication technology is used for communicating with user equipment by utilizing coordination among a plurality of geographically separated network elements, and comprises multi-point coordinated transmission and/or multi-point coordinated reception, so that the interference of cell edge user equipment is reduced, and the cell edge throughput and reliability are improved.

Therefore, for the coordinated multipoint communication technology, an effective mechanism is not available at present, so that the ue can reasonably report the power headroom report for coordinated multipoint communication.

Disclosure of Invention

The invention provides a power headroom report method and a power headroom report device for coordinated multi-point communication, which can enable user equipment to reasonably generate a power headroom report and report the power headroom report to a service base station.

In order to solve the above problems, the technical scheme provided by the invention is as follows:

the first aspect of the present invention provides a method for power headroom reporting for coordinated multipoint communication, where a first implementation manner of the method includes: the method comprises the steps that user equipment obtains an uplink coordinated multi-point (CoMP) measurement set configured by a service base station, wherein the uplink CoMP measurement set comprises measurement configuration information of a Receiving Point (RP); the user equipment estimates downlink path loss according to the uplink CoMP measurement set; and the user equipment generates a Power Headroom Report (PHR) according to the downlink path loss and reports the PHR to the service base station.

In a possible implementation manner, the measurement configuration information of the RP includes: configuring index information for a channel state information reference signal (CSI-RS) of the RP; or the CSI-RS configuration index information of the RP and the CSI-RS configuration information corresponding to the index information.

In another possible implementation manner, the measurement configuration information of the RP includes: and the CoMP cell index of the RP and the corresponding CoMP cell configuration information.

With reference to any one of the foregoing possible implementation manners, the method further includes: acquiring an uplink power control parameter configured by the serving base station; the uplink power control parameter is associated with the uplink CoMP measurement set, and is used to instruct to obtain according to the uplink power control parameter: power headroom PH and physical uplink control channel PUCCH transmitting power; or PH and PUSCH transmitting power.

In combination with the previous possible implementation manner, the method further includes: acquiring downlink path loss reference associated information configured by the service base station; the downlink path loss reference association information is associated with the uplink CoMP measurement set, and is used for indicating to acquire downlink path loss according to the CoMP measurement set and indicating to acquire the downlink path loss according to the uplink power control parameter: power headroom PH and physical uplink control channel PUCCH transmitting power; or PH and PUSCH transmitting power.

With reference to any one of the foregoing possible implementation manners, the method further includes: updating the uplink CoMP measurement set; the updating specifically includes: increasing and/or decreasing configuration information of the RP in the uplink CoMP measurement set; or reconfiguring a cell reference signal CRS in the uplink CoMP measurement set into a CSI-RS; or reconfiguring the CSI-RS in the uplink CoMP measurement set into a CRS.

In combination with the previous possible implementation manner, the updating of the uplink CoMP measurement set is based on any one of the following situations: a periodic report timer times out; or the Reference Signal Received Power (RSRP) of at least one RP in the uplink CoMP measurement set is smaller than a first preset threshold value or the downlink path loss is larger than a second preset threshold value; or the difference value of the estimated downlink path loss and the minimum downlink path loss corresponding to the RP of the uplink COMP measurement set exceeds a third preset threshold value.

In combination with the previous possible implementation manner, the measurement report includes: a CSI-RS index or a Physical Cell Identity (PCI) corresponding to the RP with the minimum downlink path loss in the uplink CoMP measurement set; or, the uplink CoMP measurement set includes CSI-RS indexes or PCIs corresponding to RPs whose RSRP is smaller than a fourth preset threshold or whose downlink path loss is larger than a fifth preset threshold.

With reference to the previous possible implementation manner, the measurement report further includes: the RSRP corresponding to the CSI-RS index; or, RSRP or downlink path loss corresponding to PCI.

In combination with any one of the above possible implementation manners, when a PH MAC CE power headroom media access control cell is used to report the PHR to the serving base station, the PH MAC CE includes the CSI-RS index or CoMP cell index indication, so as to notify the serving base station of an RP corresponding to the PH; when reporting the PHR to the serving base station by using an extended PH MAC CE, the extended MAC CE includes the CSI-RS index or CoMP cell index indication, a PH calculated according to a downlink path loss of each RP and/or a maximum output power of a user equipment configured by a corresponding serving cell, so as to notify the serving base station of an RP corresponding to the PH.

With reference to any one of the foregoing possible implementation manners, the downlink path loss is: the minimum downlink path loss corresponding to the RP in the uplink CoMP measurement set; or, a weighted average of downlink path losses corresponding to RPs in the uplink CoMP measurement set; or, an average or weighted average of downlink path losses corresponding to n RPs in the uplink CoMP measurement set, where n is a positive integer less than or equal to the number of all RPs in the uplink CoMP measurement set.

Another aspect of the present invention provides a power headroom reporting method for coordinated multipoint communication, where one possible implementation manner of the method includes: configuring an uplink coordinated multi-point (CoMP) measurement set for user equipment, wherein the uplink CoMP measurement set comprises measurement configuration information of a Receiving Point (RP); and acquiring a Power Headroom Report (PHR) which is reported by the user equipment and generated according to the downlink path loss estimated by the uplink CoMP measurement set.

In a possible implementation manner, the measurement configuration information of the RP includes: and the CoMP cell index of the RP and the corresponding CoMP cell configuration information.

With reference to any one of the foregoing possible implementation manners, the method further includes: configuring uplink power control parameters for the user equipment; the uplink power control parameter is associated with the uplink CoMP measurement set, and is used to instruct to obtain according to the uplink power control parameter: power headroom PH and physical uplink control channel PUCCH transmitting power; or PH and PUSCH transmitting power.

In combination with the previous possible implementation manner, the method further includes: configuring downlink path loss reference associated information for the user equipment; the downlink path loss reference association information is associated with the uplink CoMP measurement set, and is used to instruct the user equipment to acquire downlink path loss according to the CoMP measurement set and instruct to acquire according to the uplink power control parameter: power headroom PH and physical uplink control channel PUCCH transmitting power; or PH and PUSCH transmitting power.

With reference to any one of the foregoing possible implementation manners, the method further includes: receiving a measurement report reported by the user equipment; and updating the uplink CoMP measurement set according to the measurement report.

With reference to the previous possible implementation manner, the received measurement report includes: a CSI-RS index or a Physical Cell Identity (PCI) corresponding to the RP with the minimum downlink path loss in the uplink CoMP measurement set; or, the uplink CoMP measurement set includes CSI-RS indexes or PCIs corresponding to RPs whose RSRP is smaller than a first preset threshold or whose downlink path loss is larger than a second preset threshold.

With reference to the previous possible implementation manner, the updating the uplink CoMP measurement set includes: deleting the RP corresponding to the RSRP smaller than a first preset threshold value or the downlink path loss larger than a second preset threshold value from the uplink CoMP measurement set; or, adding new RP configuration information in the uplink CoMP measurement set.

Another aspect of the present invention provides a user equipment, where one possible implementation manner of the user equipment includes: the device comprises an acquisition unit, an estimation unit and a reporting unit; the acquiring unit is configured to acquire an uplink coordinated multi-point (CoMP) measurement set configured by a serving base station, where the uplink CoMP measurement set acquired by the acquiring unit includes measurement configuration information of a Receiving Point (RP); the estimating unit is used for estimating downlink path loss according to the uplink CoMP measurement set acquired by the acquiring unit; the reporting unit is configured to generate a power headroom report PHR according to the downlink path loss estimated by the estimating unit and report the PHR to the serving base station.

In a possible implementation manner, the obtaining unit is further configured to obtain an uplink power control parameter configured by the serving base station; the uplink power control parameter obtained by the obtaining unit is associated with the uplink CoMP measurement set, and is used for indicating that: the power headroom PH and the transmission power of a physical uplink control channel PUCCH or the transmission power of the PH and a physical uplink shared channel PUSCH.

In a possible implementation manner, the obtaining unit is further configured to obtain downlink path loss reference association information configured by the serving base station; the downlink path loss reference association information obtained by the obtaining unit is associated with the uplink CoMP measurement set, and is used to instruct obtaining of downlink path loss according to the CoMP measurement set and instruct obtaining according to the uplink power control parameter: power headroom PH and physical uplink control channel PUCCH transmitting power; or PH and PUSCH transmitting power.

In one possible implementation, the estimation unit includes: a calculation module and a comparison module; the calculation module is configured to calculate downlink path losses of all RPs in the uplink CoMP measurement set acquired by the acquisition unit, and notify the calculation module of the downlink path losses; the comparison module is configured to determine a minimum downlink path loss according to any one of the following manners after comparing the downlink path losses of all RPs according to the notification of the calculation module: taking the minimum downlink path loss corresponding to the RP in the uplink CoMP measurement set as the estimated downlink path loss; or, taking the weighted average of the downlink path loss corresponding to the RP in the uplink CoMP measurement set as the estimated downlink path loss; or, taking the average or weighted average of the downlink path loss of n RPs in the uplink CoMP measurement set as the downlink path calculation; and n is a positive integer less than or equal to the number of all RPs in the uplink CoMP measurement set.

In a possible implementation manner, the reporting unit further includes: the device comprises a judging module and a triggering module; the judging module is used for judging whether information contained in the uplink CoMP measurement set changes or not and informing the triggering module of a judgment result; the triggering module is configured to receive the notification of the determining module, and trigger a PHR process when configuration information of an RP is added and/or decreased in the uplink CoMP measurement set, or when information included in the uplink CoMP measurement set is reconfigured from a cell reference signal CRS to a CSI-RS, or when information included in the uplink CoMP measurement set is reconfigured from a CSI-RS to a CRS.

In one possible implementation, the apparatus further includes: a detection unit and a transmission unit; the detection unit is used for detecting any one of the following information and informing the sending unit of the detection result: whether the periodic report timer is expired; or, the reference signal received power RSRP of the RP in the uplink CoMP measurement set is equal to a first preset threshold; or, the downlink path loss and the second preset threshold value; or, the difference between the downlink path loss estimated by the estimation unit and the minimum RP downlink path loss is greater than a third preset threshold; the sending unit is configured to receive a detection result of the detecting unit, and report a measurement report to the serving base station when a periodic report timer is overtime, or when an RSRP of at least one RP in the uplink CoMP measurement set is smaller than a first preset threshold or a downlink path loss is greater than a second preset threshold, or when a difference between an estimated downlink path loss and a downlink path loss of a minimum RP exceeds a third preset threshold, so that the serving base station updates the uplink CoMP measurement set according to the measurement report.

Another aspect of the present invention provides a base station, where one possible implementation manner of the base station includes: a configuration unit and a receiving unit; the configuration unit is configured to configure an uplink coordinated multi-point (CoMP) measurement set for the user equipment, where the uplink CoMP measurement set configured by the configuration unit includes measurement configuration information of a Receiving Point (RP); the receiving unit is configured to obtain a power headroom report PHR, which is generated according to the downlink path loss estimated by the uplink CoMP measurement set and reported by the user equipment.

In a possible implementation manner, the configuration unit is further configured to configure an uplink power control parameter for the ue; the uplink power control parameter is associated with the uplink CoMP measurement set, and is used to instruct to obtain according to the uplink power control parameter: power headroom PH and physical uplink control channel PUCCH transmitting power; or PH and PUSCH transmitting power.

In a possible implementation manner, the configuration unit is further configured to configure downlink path loss reference association information for the ue; the downlink path loss reference association information is associated with the uplink CoMP measurement set, and is used to instruct the user equipment to acquire downlink path loss according to the CoMP measurement set and instruct to acquire according to the uplink power control parameter: power headroom PH and physical uplink control channel PUCCH transmitting power; or PH and PUSCH transmitting power.

In a possible implementation manner, the receiving unit is further configured to receive a measurement report reported by the ue; the base station further comprises an updating unit, configured to update the uplink CoMP measurement set according to the measurement report received by the receiving unit.

Another aspect of the present invention provides a user equipment, where one possible implementation manner of the user equipment includes: the system comprises a receiver and a base station, wherein the receiver is used for acquiring an uplink coordinated multi-point (CoMP) measurement set configured by a service base station, and the uplink CoMP measurement set comprises measurement configuration information of a Receiving Point (RP); a processor to: estimating downlink path loss according to the uplink CoMP measurement set; generating a Power Headroom Report (PHR) according to the downlink path loss; a transmitter, configured to report the PHR to the serving base station.

Another aspect of the present invention provides a base station, where one possible implementation manner of the base station includes: the processor is used for configuring an uplink coordinated multi-point (CoMP) measurement set for the user equipment, wherein the uplink CoMP measurement set configured by the configuration unit comprises measurement configuration information of a Receiving Point (RP); and the receiver is used for acquiring the PHR which is reported by the user equipment and generated according to the downlink path loss estimated by the uplink CoMP measurement set.

It can be seen that, by adopting the method and the device of the present invention, the service base station configures the uplink CoMP measurement set for the user equipment, so that the user equipment estimates the downlink path loss according to the uplink CoMP measurement set, thereby avoiding the problem of uncertainty of reference of the downlink path loss in uplink CoMP, further avoiding the problems of interference enhancement, decrease of RP receiving success rate, decrease of uplink throughput and the like caused by large PUSCH/PUCCH transmission power and small PH, so that the user equipment and the service base station accurately estimate the downlink path loss and the PUSCH/PUCCH transmission power, and by sending a reasonable power headroom report to the base station, the base station can accurately allocate uplink resources, reduce interference and improve uplink throughput.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.

Fig. 1 is a flowchart illustrating a power headroom reporting method for coordinated multipoint communication according to an embodiment of the present invention;

fig. 2 is a diagram illustrating a format of a PH MAC CE message in an embodiment of the present invention;

FIG. 3 is a diagram illustrating an Extended PH MAC CE message format according to an embodiment of the present invention;

fig. 4 is a schematic flowchart of a power headroom reporting method of coordinated multipoint communication according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a user equipment according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of another ue according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of another base station according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

CoMP communication communicates with a UE by using cooperation among a plurality of geographically separated network elements, including multipoint cooperative transmission and/or multipoint cooperative reception, and converts interference between cells into an expected signal through Joint Processing (JP), or avoids collision with beams and time-frequency resources of neighboring cells through Coordinated Scheduling/beam forming (CS/CB), thereby reducing interference of cell edge UE and improving cell edge throughput (cell edge throughput) and improving reliability.

The network element may be, for example, a cell (cell), a node (e.g., a base station, a relay node) corresponding to the cell, a Remote Radio Head (RRH), a Radio Remote Unit (RRU), an antenna port (antenna port), and the like, and the network element may be collectively referred to as a Transmission Point (TP). CoMP may be applied to downlink communication and/or uplink communication, and for uplink CoMP, the network element may also be referred to as a Receiving Point (RP).

An embodiment of the present invention provides a power headroom reporting method for coordinated multipoint communication, an execution subject of which may be user equipment, as shown in fig. 1, the method including:

step 110: the method comprises the steps that user equipment obtains an uplink coordinated multi-point (CoMP) measurement set configured by a service base station, wherein the uplink CoMP measurement set comprises measurement configuration information of a Receiving Point (RP).

The uplink CoMP measurement set includes measurement configuration information of one or more RPs, and the uplink CoMP measurement set may include the following two types of parameters, but is not limited to the following two types of parameters:

A. when the uplink CoMP measurement set indicates a Reference Signal Receiving Power (Reference Signal Receiving Power) measurement based on a channel state information Reference Signal (CSI-RS), the uplink CoMP measurement set includes: one or more CSI-RS configuration indexes and corresponding CSI-RS configuration information thereof; the CSI-RS configuration information comprises one of the following contents or any combination thereof: antenna Ports (antenna Ports Count), resource configuration (resource Config), subframe configuration (subframe Config), CSI-RS reference signal power information.

It should be noted that the content of the uplink CoMP measurement set may also only include CSI-RS configuration index information, and other configuration information and measurement sets may be included in different RRC (Radio Resource Control) cells (information elements, IE); the CSI-RS reference signal power information may be transmission power information or ratio information of PDSCH (Physical Downlink Shared Channel) Energy Per Resource Element (EPRE) to CSI-RS EPRE. The CSI-RS configuration index information may be a relevant index number of the CSI-RS configuration information, so as to identify or distinguish different CSI-RS configuration information. For example, the ue may obtain the CSI-RS configuration information assigned by the ue according to the CSI-RS configuration index information issued by the serving base station, which is not limited in the present invention.

B. When the uplink CoMP measurement set indicates Cell Reference Signal (CRS) -based RSRP measurement, the uplink CoMP measurement set includes: one or more CoMP cell indexes and corresponding CoMP cell configuration information thereof; the CoMP cell configuration information includes one or any combination of the following: the carrier frequency information of the cell includes, for example, an Absolute Radio Frequency Channel Number (ARFCN), a physical cell identifier (physcellld), CRS Reference Signal Power information (RSP), and the like.

Optionally, the ue may further obtain an uplink power control parameter configured by the serving base station, where the uplink power control parameter includes at least one of the following parameters: information such as a nominal PUCCH (Physical Uplink Control Channel) reference transmission power (p 0-nominal PUCCH), a user equipment-specific PUCCH reference transmission power (p 0-user equipment-PUCCH), a nominal PUSCH (Physical Uplink shared Channel) reference transmission power (p 0-nominal PUSCH), a user equipment-specific PUSCH reference transmission power (p 0-user equipment-PUSCH), and a downlink loss compensation factor (alpha); of course, the present embodiment is not limited thereto, and will not be described herein again. It is to be noted that, in the method of this embodiment, an uplink power control parameter corresponding to each uplink CoMP measurement set may also be configured, and an uplink power control parameter corresponding to each CSI-RS configuration information or CoMP cell configuration information in the uplink CoMP measurement set may also be configured respectively; the uplink power control parameter configuration information may be included in a different RRC information element from the associated uplink CoMP measurement set configuration information.

Optionally, the ue may also obtain downlink path loss Reference association information configured by the serving base station, where the downlink path loss Reference association information indicates association information used by the ue when estimating downlink path loss, calculating Power Headroom (PH), PUCCH/PUSCH transmission Power, and Sounding Reference Signal (SRS) transmission Power; the downlink path loss reference association information may be associated with the uplink CoMP measurement set, and is used to instruct the user equipment to estimate downlink path loss according to the CoMP measurement set, and also to instruct the user equipment to calculate PH and PUCCH/PUSCH transmission power according to uplink power control parameters corresponding to the CoMP measurement set; when the system is configured with Carrier Aggregation (CA), the downlink path loss reference correlation information may be a primary serving cell (PCell), a secondary serving cell (SCell), or an uplink CoMP measurement set; when CA is not configured, the downlink path loss reference association information may be a PCell or an uplink CoMP measurement set.

It should be noted here that, in the prior art, in RRC signaling, the user equipment is directly instructed to measure the path loss according to the reference signal CRS of the designated cell, and the user equipment may calculate the downlink path loss according to the signal power of the CRS sent by the serving cell configured by the base station — the signal power of the CRS actually received; in this embodiment, the user equipment calculates the downlink path loss according to the measurement condition of the multiple CSI-RSs in the uplink CoMP measurement set, the configuration information includes the transmission power of the multiple CSI-RSs or CRSs, and the user equipment may calculate the downlink path loss according to the power of the CSI-RSs or CRSs received by the power-user equipment that transmits the CRS or CSI-RSs by the base station based on the average value or the minimum value of the multiple CSI-RSs or CRSs, thereby ensuring the stability of downlink path loss estimation.

Optionally, after the ue acquires the uplink coordinated multi-point CoMP measurement set configured by the serving base station, the ue may send a radio resource control connection reconfiguration Complete (RRC connection reconfiguration Complete) message to the serving base station.

Step 120: and the user equipment estimates the downlink path loss according to the uplink CoMP measurement set.

Specifically, regardless of whether the serving base station indicates CSI-RS-based RSRP measurement or CRS-based RSRP measurement in the uplink CoMP measurement set configured for the user equipment, the user equipment may estimate the downlink path loss by obtaining a difference between RSP and RSRP; wherein RSP is the actual reference signal transmit power, and is configured to the ue by the serving base station through RRC signaling.

In addition, the present embodiment provides another downlink path loss estimation method, but those skilled in the art understand that the present invention is not limited to this: the downlink path loss is the minimum downlink path loss in all RPs in the uplink CoMP measurement set; or, the weighted average of the downlink path loss of all RPs, that is, different RPs may take different values as different factors, and the sum of all factors is 1; or, an average or weighted average of the minimum downlink path losses of the n RPs; wherein n is less than or equal to the number of all RPs in the uplink CoMP measurement set.

Step 130: and the user equipment generates a Power Headroom Report (PHR) according to the downlink path loss and reports the PHR to the service base station.

In this embodiment, a periodic trigger, a trigger based on a downlink loss change, or a trigger based on an uplink CoMP measurement set change is adopted, but not limited to this: specifically, the user equipment triggers the PHR process when configuration information of one or more RPs is added and/or deleted in the uplink CoMP measurement set, or when the content of the uplink CoMP measurement set is reconfigured from CRS-based RSRP measurement to CSI-RS-based RSRP measurement, or when the uplink CoMP measurement set is reconfigured from CSI-RS-based RSRP measurement to CRS-based RSRP measurement.

When the user equipment triggers the PHR process, the user equipment calculates PH and P_CMAX，c(maximum UE output power configured by a serving cell c), PUSCH transmission power and PUCCH transmission power, then acquiring each parameter according to a PHR message format and writing the parameters into a corresponding field, generating a PHR and reporting the PHR to a serving base station; in this embodiment, the user equipment may calculate the PH and the PUCCH/PUSCH transmission power according to the minimum downlink path loss estimated by the uplink CoMP measurement set and the uplink power control parameter of the RP corresponding to the minimum downlink path loss, or calculate the PH and the PUCCH/PUSCH transmission power according to the downlink path loss average value or the weighted average value and the uplink power control parameter corresponding to the uplink CoMP measurement set, or calculate the PH and the PUCCH/PUSCH transmission power corresponding to each RP according to the downlink path loss estimated by each RP in the uplink CoMP measurement set and the uplink power control parameter corresponding to each RP.

In addition, when the user equipment configures the PH, the user equipment reports the PHR to the serving base station in a PH MAC CE format; when the user equipment configures extended PH, the user equipment reports PHR to the serving base station by adopting extended PHMACCE; when the user equipment configures CA and extended PH, the serving base station may configure an uplink CoMP measurement set for the primary serving cell and at least 1 secondary serving cell, respectively, and include, in the extended PH, PH information calculated according to the uplink CoMP measurement set for each serving cell configured with the uplink CoMP measurement set.

It should be noted that, in this embodiment, the PHR reported by the ue may adopt multiple formats, and the following description only takes two formats, namely, a PH MAC CE and an extended MAC CE as an example, but is not limited to this;

firstly, when reporting the PHR by using the PH MAC CE or extended MAC CE, the CSI-RS index or CoMP cell index indication is included in both the PH MAC CE and the extended MAC CE, so as to notify the serving base station of an RP corresponding to the PH; specifically, each CSI-RS index or CoMP cell index occupies 1bit, a value of 0 indicates that the measurement result of the corresponding RP is not used, and a value of 1 indicates that the measurement of the corresponding RP is used; meanwhile, under the condition of configuring multiple sets of uplink power control parameters, the base station is convenient to select the corresponding uplink power control parameters to be used as reference information for allocating uplink resources in the subsequent uplink scheduling. When the ue is configured with CA, the serving base station may configure a CoMP measurement set for the PCell and at least 1 SCell, and correspondingly indicate a CSI-RS index or a CoMP cell index for each serving cell in an extendedMAC CE reported by the ue; herein, the PCell and SCell are collectively referred to as a serving cell.

As shown in fig. 2, the PH MAC CE occupies a fixed capacity of three bytes, and includes a MAC subheader of one byte and a PHR MAC CE payload of two bytes; and "R" in the MAC subheader indicates a reserved field; "E" is an extension field indicating whether there are any subsequent MAC subheaders and corresponding media access control service data units (MAC SDUs); LCID is logical channel identification, representing the type of the MAC CE; in the MAC CE dead load, "R" represents a reserved field, PH represents a power headroom level, and the value is 0-63; d0-7 in the dead load represents a reference signal index and represents a CSI-RS index or a CoMP cell index in uplink CoMP measurement.

As shown in fig. 3, the Extended PH MAC CE format is variable length, and includes a two-byte MAC subheader and a variable length Extended PHR MAC CE payload, which are related to whether PUCCH and PUSCH are configured for simultaneous transmission, the number of scells in an active state when a PHR is transmitted, whether each activated SCell is allocated with uplink resources, and other factors(ii) a Wherein, the meaning of the 'R/E/LCID' in the MAC subheader is the same as that of the MAC subheader of the PHR; "F" indicates whether the "L" field is 7bit or 15 bit; "L" represents the length of the MAC deadload; the meaning of R/PH in the MAC CE dead load is the same as that of PH MAC CE dead load; when the simultaneous transmission of the PUCCH and the PUSCH is configured, the method also comprises type 2PH, otherwise, the method only comprises type 1 PH; "C1-C7" indicates whether PH corresponding to SCell index exists, and only scells in activated state have corresponding PH; d0-7 represents a reference signal index, which represents a CSI-RS index or a CoMP cell index in uplink CoMP measurement configured by a corresponding service cell; "P" indicates whether the user equipment performs power backoff; "V" indicates whether the PH is calculated for real uplink transmission or virtual PH, the former indicates that uplink resources are allocated on the SCell when the PHR is transmitted, and the latter indicates that no uplink resources are allocated on the SCell, but a reference format is used; when "V" is 0, it is the maximum UE output power P configured by the corresponding serving cell_CMAXThe field does not appear.

Secondly, when reporting the PHR by using the extended PH MAC CE, the extended PH MAC CE may also include a PH calculated according to a downlink path loss of each RP and/or a corresponding P_CMAX(ii) a When CA is configured, the service base station respectively configures CoMP measurement sets for the PCell and at least 1 SCell, and the extended MAC CE respectively comprises the PH calculated according to the downlink path loss of each RP in the uplink CoMP measurement set and/or the corresponding P for each service cell_CMAX(ii) a The difference between the method and the system is that the PCell and each activated serving cell can contain a plurality of PHs, and when the bit value corresponding to the CSI-RS index or the CoMP cell index D0-D7 is 1, the PH is contained; p of each active serving cell_CMAXIncludes 1, and may include more than one, which are not described herein again.

In addition, the present embodiment may further include step 140: when a periodic measurement report timer is overtime, or when RSRP of one or more RPs in an uplink CoMP measurement set is smaller than a threshold X or downlink path loss is larger than a threshold Y, or when the difference value of the estimated downlink path loss and the minimum RP downlink path loss exceeds a threshold Z, the user equipment reports a measurement report to the serving base station so that the serving base station updates the uplink CoMP measurement set according to the measurement report; wherein the thresholds X, Y and Z are preset threshold values.

In this embodiment, the measurement report that the ue reports to the serving base station may further include: a CSI-RS index or PCI (Physical cell identification) corresponding to an RP with the minimum downlink path loss in the uplink CoMP measurement set; or CSI-RS indexes or PCIs corresponding to a plurality of RPs with the minimum downlink path loss in the uplink CoMP measurement set; or CSI-RS indexes or PCIs corresponding to one or more RPs with RSRP smaller than a threshold x or downlink path loss larger than the threshold x in the uplink CoMP measurement set; in addition, the measurement report may further include an RSRP or a downlink path loss value, etc., corresponding to the CSI-RS or the PCI corresponding to the RP; but is not limited thereto.

Another embodiment of the present invention also provides a power headroom reporting method for coordinated multipoint communication, which is described with respect to the previous embodiment taking a base station as an execution subject, and as shown in fig. 4, the method includes:

step 210: configuring an uplink coordinated multi-point (CoMP) measurement set for user equipment, wherein the uplink CoMP measurement set comprises measurement configuration information of a Receiving Point (RP).

It should be noted that, in order to obtain a suitable RP from multiple RPs in the CoMP technology, in this embodiment, the serving base station needs to configure a CoMP measurement set for the user equipment through a radio resource control Connection Reconfiguration (RRC Connection Reconfiguration) message, in addition to configuring the uplink power control parameter and the downlink loss reference association information for the user equipment. Optionally, after receiving the rrc connection reconfiguration message, the ue extracts the uplink CoMP measurement set from the message.

A. when the uplink CoMP measurement set indicates a channel state information reference signal (CSI-RS) -based RSRP measurement, the uplink CoMP measurement set includes: one or more CSI-RS configuration indexes and corresponding CSI-RS configuration information thereof; the CSI-RS configuration information comprises one of the following contents or any combination thereof: antenna Ports (antenna Ports Count), resource configuration (resource Config), subframe configuration (subframe Config), CSI-RS reference signal power information, and the like;

it should be noted that the content of the uplink CoMP measurement set may also only include CSI-RS configuration index information, and other configuration information and measurement sets may be included in different RRC cells (information elements, IEs); the CSI-RS reference signal power information may be transmission power information or ratio information of PDSCH Energy Per Resource Element (EPRE) to CSI-RS EPRE.

It should also be noted that the content of the uplink CoMP measurement set may also only include the CoMP cell index and the corresponding physical cell identifier configuration information, and other configuration information and measurement sets are included in different RRC cells (information elements, IEs).

In addition, when the serving base station configures an uplink power control parameter for the ue, the uplink power control parameter includes at least one of the following: nominal PUCCH reference transmission power (p 0-NominalPUCCH), user equipment specific PUCCH reference transmission power (p 0-user equipment-PUCCH), nominal PUSCH reference transmission power (p 0-NominalPUSCH), user equipment specific PUSCH reference transmission power (p 0-user equipment-PUSCH), downlink path loss compensation factor (alpha) and the like; of course, the present embodiment is not limited thereto, and will not be described herein again. It is to be noted that, in the method of this embodiment, an uplink power control parameter corresponding to each uplink CoMP measurement set may also be configured, and an uplink power control parameter corresponding to each CSI-RS configuration information or CoMP cell configuration information in the uplink CoMP measurement set may also be configured respectively; the uplink power control parameter configuration information may be included in a different RRC information element from the associated uplink CoMP measurement set configuration information.

Similarly, after the serving base station configures downlink path loss reference association information for the user equipment, the downlink path loss reference association information indicates association information used by the user equipment in estimating downlink path loss, calculating a PH, a PUCCH/PUSCH transmission power, and a Sounding Reference Signal (SRS) transmission power; the downlink path loss reference association information may be associated with the uplink CoMP measurement set, and is used to instruct the user equipment to estimate downlink path loss according to the CoMP measurement set, and also to instruct the user equipment to calculate PH and PUCCH/PUSCH transmission power according to uplink power control parameters corresponding to the CoMP measurement set; when a system is configured with Carrier Aggregation (CA), the downlink path loss reference association information may be a primary serving cell (PCell), a secondary serving cell (SCell), or an uplink CoMP measurement set; when CA is not configured, the downlink path loss reference association information may be a PCell or an uplink CoMP measurement set.

It should be noted here that, in the prior art, in RRC signaling, the user equipment is directly instructed to measure the path loss according to the reference signal CRS of the designated cell, and the user equipment may calculate the downlink path loss according to the signal power of the CRS sent by the serving cell configured by the base station — the signal power of the CRS actually received; in this embodiment, the user equipment is instructed to calculate the downlink path loss according to the measurement condition of the multiple CSI-RSs in the uplink CoMP measurement set, the configuration information includes the transmission power of the multiple CSI-RSs or CRSs, and the user equipment may calculate the downlink path loss according to the average value or the minimum value of the multiple CSI-RSs or CRSs and the power of the CSI-RSs or CRSs received by the user equipment, where the power of the CRS or CSI-RSs is sent by the base station, so as to ensure the stability of downlink path loss estimation.

It should be noted that, in this embodiment, the serving base station reconfiguring the uplink CoMP measurement set for the ue also belongs to one of the operations of the serving base station configuring parameters for the ue; for example, configuration information of one or more RPs is added and/or deleted from the current uplink CoMP measurement set; for another example, the content of the current uplink CoMP measurement set is reconfigured from the CRS-based RSRP measurement to the CSI-RS-based RSRP measurement, or from the CSI-RS-based RSRP measurement to the CRS-based RSRP measurement, etc.; and will not be described in detail herein.

Step 220: and acquiring a Power Headroom Report (PHR) which is reported by the user equipment and generated according to the downlink path loss estimated by the uplink CoMP measurement set.

Specifically, no matter the serving base station indicates CSI-RS-based RSRP measurement or CRS-based RSRP measurement in the uplink CoMP measurement set configured for the user equipment, the user equipment estimates the downlink path loss by obtaining a difference between RSP and RSRP; wherein RSP is the actual reference signal transmit power, and is configured to the ue by the serving base station through RRC signaling.

In addition, when the user equipment configures the PH, the user equipment reports the PHR to the serving base station in a PH MAC CE format; when the user equipment configures extended PH, the user equipment reports PHR to the serving base station by adopting extended PH MACCE; when the user equipment configures CA and extended PH, the serving base station may configure an uplink CoMP measurement set for the primary serving cell and at least 1 secondary serving cell, respectively, and include, in the extended PH, PH information calculated according to the uplink CoMP measurement set for each serving cell configured with the uplink CoMP measurement set.

In addition, the present embodiment may further include step 230: when a periodic measurement report timer is overtime, or when RSRP of one or more RPs in an uplink CoMP measurement set is smaller than a threshold X or downlink path loss is larger than a threshold Y, or when the difference value of the estimated downlink path loss and the minimum RP downlink path loss exceeds a threshold Z, the service base station receives a measurement report reported by the user equipment and updates the uplink CoMP measurement set according to the measurement report; wherein the thresholds X, Y and Z are preset threshold values.

In this embodiment, the measurement report reported by the ue received by the serving base station may further include: a CSI-RS index or PCI (Physical cell identification) corresponding to an RP with the minimum downlink path loss in the uplink CoMP measurement set; or CSI-RS indexes or PCIs corresponding to a plurality of RPs with the minimum downlink path loss in the uplink CoMP measurement set; or CSI-RS indexes or PCIs corresponding to one or more RPs with RSRP smaller than a threshold x or downlink path loss larger than the threshold x in the uplink CoMP measurement set; in addition, the measurement report may further include an RSRP or a downlink path loss value, etc., corresponding to the CSI-RS or the PCI corresponding to the RP; but is not limited thereto.

Correspondingly, after receiving the measurement report reported by the user equipment, the serving base station may also update the uplink CoMP measurement set according to the measurement report, and configure the updated uplink CoMP measurement set for the user equipment; and the user equipment sends a radio resource control connection reconfiguration completion message to a service base station after receiving the updated uplink CoMP measurement set. The operation of the serving base station updating the uplink CoMP measurement set may be specifically implemented by the following means, but is not limited to the following: and deleting the RP corresponding to the RSRP smaller than a first preset threshold value or the downlink path loss larger than a second preset threshold value from the uplink CoMP measurement set, or adding new RP configuration information in the uplink CoMP measurement set.

Specifically, when the measurement report shows that the radio condition of the ue changes due to a change in location or the like, individual RPs in the uplink CoMP measurement set configured by the serving base station may no longer be suitable for participating in uplink cooperative communication of the ue, and at this time, the serving base station is required to delete the RPs or add a new RP; for example, the serving base station deletes an RP corresponding to an RSRP smaller than a threshold x or a downlink path loss larger than the threshold x from the uplink CoMP measurement set, or the serving base station adds new RP configuration information to the uplink CoMP measurement set according to other measurement results, such as SRS or Radio Resource Management (RRM) measurement; of course, other methods are possible, and the present embodiment is not described herein again.

It can be seen that, by adopting the method of the embodiment of the present invention, the serving base station configures the uplink CoMP measurement set for the user equipment, so that the user equipment estimates the downlink path loss according to the uplink CoMP measurement set, thereby avoiding the problem of uncertainty of reference of the downlink path loss in uplink CoMP, further avoiding the problems of interference enhancement, decrease in RP reception success rate, decrease in uplink throughput, and the like caused by large PUSCH/PUCCH transmission power and small PH, so that the user equipment and the serving base station more accurately estimate the downlink path loss and PUSCH/PUCCH transmission power, more accurately allocate uplink resources, decrease interference, and increase in uplink throughput.

Another embodiment of the present invention also provides a ue, as shown in fig. 5, the ue 500 includes: an obtaining unit 510, an estimating unit 520 and a reporting unit 530; the obtaining unit 510 is configured to obtain an uplink coordinated multi-point CoMP measurement set configured by a serving base station; the uplink CoMP measurement set acquired by the acquiring unit 510 includes measurement configuration information of at least one receiving point RP; the estimating unit 520 is configured to estimate a downlink path loss according to the uplink CoMP measurement set acquired by the acquiring unit 510; the reporting unit 530 is configured to trigger a PHR process, generate a PHR according to the downlink path loss estimated by the estimating unit 520, and report the PHR to the serving base station.

In addition, in this embodiment, the obtaining unit 510 is further configured to obtain an uplink power control parameter configured by the serving base station; the uplink power control parameter acquired by the acquisition unit is associated with the uplink CoMP measurement set, or is associated with CSI-RS configuration information in the uplink CoMP measurement set, or is associated with CoMP cell configuration information in the uplink CoMP measurement set.

In addition, in this embodiment, the obtaining unit 510 is further configured to obtain downlink path loss reference association information configured by the serving base station; the downlink path loss reference association information acquired by the acquisition unit is associated with the uplink CoMP measurement set, and is used for indicating that downlink path loss is estimated according to the CoMP measurement set, and calculating power headroom PH and transmission power of a physical uplink control channel PUCCH/physical uplink shared channel PUSCH according to uplink power control parameters corresponding to the CoMP measurement set.

Wherein, the estimation unit 520 may further include (not shown in the figure): a calculation module and a comparison module; the calculating module is configured to calculate downlink path losses of all RPs in the uplink CoMP measurement set acquired by the acquiring unit 510, and notify the calculating module of the downlink path losses; the comparison module is configured to compare the downlink path loss of all RPs according to the notification of the calculation module, and then use a minimum downlink path loss of all RPs in the uplink CoMP measurement set as an estimated downlink path loss, or use a weighted average of the downlink path loss of all RPs in the uplink CoMP measurement set as an estimated downlink path loss, or use an average or weighted average of the downlink path loss of n RPs in the uplink CoMP measurement set as a downlink path calculation; wherein n is less than or equal to the number of all RPs in the uplink CoMP measurement set.

Optionally, in this embodiment, the reporting unit 530 may further include (not shown in the figure): the device comprises a judging module and a triggering module; the judging module is used for judging whether the content in the uplink CoMP measurement set changes or not and informing the triggering module of the judging result; the triggering module is configured to receive the notification of the determining module, and trigger a PHR process when configuration information of at least one RP is added and/or subtracted in the uplink CoMP measurement set, or when content of the uplink CoMP measurement set is reconfigured from CRS-based filtered reference signal received power, RSRP, measurement to CSI-RS-based RSRP measurement, or when the uplink CoMP measurement set is reconfigured from CSI-RS-based RSRP measurement to CRS-based RSRP measurement.

In addition, the reporting unit 530 may further include (not shown in the figure): a processing module and a generating module; the processing module is configured to calculate PH and PUCCH/PUSCH transmit power using the downlink path loss estimated by the estimation unit, and notify the generation module of the calculation result; the generating module is used for acquiring the calculation result of the processing module, and writing each parameter in the calculation result into a corresponding field of the PHR message to generate the PHR.

Based on the above components of the ue in this embodiment, the ue may further include (not shown in the figure): a detection unit and a transmission unit; the detecting unit is configured to detect whether a periodic report timer is overtime, or detect RSRP of an RP in the uplink CoMP measurement set or a size of a downlink path loss corresponding to a preset threshold value of the RSRP or the downlink path loss, respectively, or detect a size of a difference between the downlink path loss estimated by the estimating unit and a minimum RP downlink path loss and a third preset threshold value, and notify the transmitting unit of a detection result; the sending unit is configured to receive a detection result of the detecting unit, and report a measurement report to the serving base station when a periodic report timer is overtime, or when an RSRP of at least one RP in the uplink CoMP measurement set is smaller than a first preset threshold or a downlink path loss is greater than a second preset threshold, or when a difference between an estimated downlink path loss and a downlink path loss of a minimum RP exceeds a third preset threshold, so that the serving base station updates the uplink CoMP measurement set according to the measurement report.

In this embodiment, the serving base station configures an uplink CoMP measurement set for the user equipment, so that the user equipment estimates downlink path loss according to the uplink CoMP measurement set, thereby avoiding the problem of uncertainty of downlink path loss reference in uplink CoMP, further avoiding the problems of interference enhancement, decrease in RP reception success rate, decrease in uplink throughput, and the like caused by large PUSCH/PUCCH transmission power and small PH, and enabling the user equipment and the serving base station to estimate downlink path loss and PUSCH/PUCCH transmission power more accurately, allocate uplink resources more accurately, reduce interference, and improve uplink throughput.

Another embodiment of the present invention also provides a base station, as shown in fig. 6, the base station 600 includes: a configuration unit 610 and a receiving unit 620; the configuration unit 610 is configured to configure an uplink coordinated multi-point CoMP measurement set for a user equipment; the uplink CoMP measurement set configured by the configuration unit 610 includes measurement configuration information of at least one receiving point RP; the receiving unit 620 is configured to obtain a PHR, which is reported by the user equipment and generated according to the downlink path loss estimated by the uplink CoMP measurement set.

Wherein, the configuring unit 610 is further configured to configure an uplink power control parameter for the ue; the uplink power control parameter is associated with the uplink CoMP measurement set, or is associated with CSI-RS configuration information in the uplink CoMP measurement set, or is associated with CoMP cell configuration information in the uplink CoMP measurement set.

In addition, the configuration unit 610 is further configured to configure downlink path loss reference association information for the ue; and the downlink path loss reference association information is associated with the uplink CoMP measurement set and used for instructing the user equipment to estimate downlink path loss according to the CoMP measurement set and calculate power headroom PH and transmission power of a physical uplink control channel PUCCH/physical uplink shared channel PUSCH according to uplink power control parameters corresponding to the CoMP measurement set.

In this embodiment, the receiving unit may be further configured to receive a measurement report reported by the ue.

It should be noted that the base station apparatus of the present embodiment may further include (not shown in the figure) an updating unit; wherein, the updating unit is configured to update the uplink CoMP measurement set according to the measurement report received by the receiving unit.

It is noted that another embodiment of the present invention also provides a ue, as shown in fig. 7, the ue 700 includes: a receiver 710, configured to obtain an uplink coordinated multi-point CoMP measurement set configured by a serving base station, where the uplink CoMP measurement set includes measurement configuration information of a receiving point RP; a processor 720 for: estimating downlink path loss according to the uplink CoMP measurement set and generating a Power Headroom Report (PHR) according to the downlink path loss; a transmitter 730, configured to report the PHR to the serving base station.

In this embodiment, the receiver 710 is further configured to obtain an uplink power control parameter configured by the serving base station; the uplink power control parameter obtained by the receiver 710 is associated with the uplink CoMP measurement set, or is associated with CSI-RS configuration information in the uplink CoMP measurement set, or is associated with CoMP cell configuration information in the uplink CoMP measurement set.

In addition, in this embodiment, the receiver 710 is further configured to obtain downlink path loss reference association information configured by the serving base station; the downlink path loss reference association information obtained by the receiver 710 is associated with the uplink CoMP measurement set, and is used to instruct to estimate downlink path loss according to the CoMP measurement set, and calculate power headroom PH and transmission power of a physical uplink control channel PUCCH/physical uplink shared channel PUSCH according to uplink power control parameters corresponding to the CoMP measurement set.

The processor 720 may be further configured to calculate downlink path losses of all RPs in the uplink CoMP measurement set acquired by the receiver, and after comparing the downlink path losses of all RPs, use a minimum downlink path loss of all RPs in the uplink CoMP measurement set as an estimated downlink path loss, or use a weighted average of the downlink path losses of all RPs in the uplink CoMP measurement set as the estimated downlink path loss, or use an average or weighted average of the downlink path losses of n RPs in the uplink CoMP measurement set as the downlink path calculation; wherein n is less than or equal to the number of all RPs in the uplink CoMP measurement set.

Optionally, in this embodiment, the processor 720 may be further configured to determine whether content in the uplink CoMP measurement set changes, and trigger a PHR process when configuration information of at least one RP is added and/or decreased in the uplink CoMP measurement set, or when the content of the uplink CoMP measurement set is reconfigured from a filtering reference signal received power RSRP measurement based on a CRS to an RSRP measurement based on a CSI-RS, or when the uplink CoMP measurement set is reconfigured from an RSRP measurement based on a CSI-RS to an RSRP measurement based on a CRS.

In addition, the processor 720 may be further configured to calculate a PH and a PUCCH/PUSCH transmission power by using the downlink path loss, and write each parameter in the calculation result into a corresponding field of the PHR message to generate the PHR.

It should be noted that another embodiment of the present invention also provides a base station, as shown in fig. 8, the base station 800 includes: a processor 810, configured to configure an uplink coordinated multi-point CoMP measurement set for a user equipment, where the uplink CoMP measurement set configured by the configuration unit includes measurement configuration information of a receiving point RP; a receiver 820, configured to obtain a PHR generated according to the downlink path loss estimated by the uplink CoMP measurement set and reported by the user equipment.

Wherein the processor 810 is further configured to configure an uplink power control parameter for the ue; the uplink power control parameter is associated with the uplink CoMP measurement set, or is associated with CSI-RS configuration information in the uplink CoMP measurement set, or is associated with CoMP cell configuration information in the uplink CoMP measurement set.

In addition, the processor 810 is further configured to configure downlink path loss reference association information for the ue; and the downlink path loss reference association information is associated with the uplink CoMP measurement set and used for instructing the user equipment to estimate downlink path loss according to the CoMP measurement set and calculate power headroom PH and transmission power of a physical uplink control channel PUCCH/physical uplink shared channel PUSCH according to uplink power control parameters corresponding to the CoMP measurement set.

It should be noted that the receiver 820 of this embodiment may also be configured to receive a measurement report reported by the ue, and update the uplink CoMP measurement set according to the measurement report.

It should be noted that, as is readily apparent to those skilled in the art, various ue or base stations implementing power headroom reporting for coordinated multipoint communication described in the foregoing embodiments may also exist as part of various network devices or mobile terminals, and are consistent with the description in the foregoing embodiments in terms of implementing power headroom reporting for coordinated multipoint communication in various network devices or mobile terminals, so that a network device or a terminal including a ue or base station implementing power headroom reporting for coordinated multipoint communication in the foregoing embodiments is also included in the protection scope of the present application, and is not described herein again.

Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present embodiments.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present embodiments. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the embodiments. Thus, the present embodiments are not intended to be limited to the embodiments shown herein but are to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention shall be included in the scope of the present invention.

Claims

1. A method for power headroom reporting for coordinated multipoint communication, comprising:

the method comprises the steps that user equipment obtains an uplink coordinated multi-point (CoMP) measurement set configured by a service base station, wherein the uplink CoMP measurement set comprises measurement configuration information of a plurality of Receiving Points (RP);

the user equipment estimates downlink path loss according to the minimum value or the average value of cell reference signals CRSs or channel state information reference signals CSI-RSs of the multiple RPs in the uplink CoMP measurement set;

and the user equipment generates a Power Headroom Report (PHR) according to the downlink path loss and reports the PHR to the service base station.

2. The method of claim 1, wherein the measurement configuration information of the RP comprises:

configuring index information for a channel state information reference signal (CSI-RS) of the RP; or,

and the CSI-RS configuration index information of the RP and the CSI-RS configuration information corresponding to the index information.

3. The method of claim 1, wherein the measurement configuration information of the RP comprises:

and the CoMP cell index of the RP and the corresponding CoMP cell configuration information.

4. The method of claim 1, further comprising:

acquiring an uplink power control parameter configured by the serving base station;

the uplink power control parameter is associated with the uplink CoMP measurement set, and is used to instruct to obtain according to the uplink power control parameter:

power headroom PH and physical uplink control channel PUCCH transmitting power; or,

PH and PUSCH transmission power.

5. The method of claim 4, further comprising:

acquiring downlink path loss reference associated information configured by the service base station;

the downlink path loss reference association information is associated with the uplink CoMP measurement set, and is used for indicating to acquire downlink path loss according to the CoMP measurement set and indicating to acquire the downlink path loss according to the uplink power control parameter:

PH and PUSCH transmission power.

6. The method of any of claims 1 to 5, further comprising:

updating the uplink CoMP measurement set;

the updating specifically includes:

increasing and/or decreasing configuration information of the RP in the uplink CoMP measurement set; or

Reconfiguring a cell reference signal CRS in the uplink CoMP measurement set into a CSI-RS; or

And reconfiguring the CSI-RS in the uplink CoMP measurement set into a CRS.

7. The method of claim 6, wherein:

the updating of the uplink CoMP measurement set is based on any one of the following conditions:

a periodic report timer times out; or

The Reference Signal Received Power (RSRP) of at least one RP in the uplink CoMP measurement set is smaller than a first preset threshold value or the downlink path loss is larger than a second preset threshold value; or

And the difference value of the estimated downlink path loss and the minimum downlink path loss corresponding to the RP of the uplink COMP measurement set exceeds a third preset threshold value.

8. The method of claim 7, wherein the measurement report comprises:

a CSI-RS index or a Physical Cell Identity (PCI) corresponding to the RP with the minimum downlink path loss in the uplink CoMP measurement set; or,

and CSI-RS indexes or PCIs corresponding to RPs with RSRP smaller than a fourth preset threshold value or downlink path loss larger than a fifth preset threshold value in the uplink CoMP measurement set.

9. The method of claim 8, wherein the measurement report further comprises:

the RSRP corresponding to the CSI-RS index; or,

and the RSRP or the downlink path loss corresponding to the PCI.

10. The method of claim 9, wherein:

when reporting the PHR to the serving base station by adopting a PH MAC CE power headroom media access control cell, the PH MAC CE comprises the CSI-RS index or CoMP cell index indication, and the RP corresponding to the PH is notified to the serving base station;

when reporting the PHR to the serving base station by using an extended PH MAC CE, the extended MAC CE includes the CSI-RS index or CoMP cell index indication, a PH calculated according to a downlink path loss of each RP and/or a maximum output power of a user equipment configured by a corresponding serving cell, so as to notify the serving base station of an RP corresponding to the PH.

11. The method of claim 10, wherein the downlink path loss is:

the minimum downlink path loss corresponding to the RP in the uplink CoMP measurement set; or,

a weighted average value of downlink path loss corresponding to the RP in the uplink CoMP measurement set; or,

and the average value or the weighted average value of the downlink path loss corresponding to n RPs in the uplink CoMP measurement set, wherein n is a positive integer less than or equal to the number of all RPs in the uplink CoMP measurement set.

12. A method for power headroom reporting for coordinated multipoint communication, comprising:

configuring an uplink coordinated multi-point (CoMP) measurement set for user equipment, wherein the uplink CoMP measurement set comprises measurement configuration information of a plurality of Receiving Points (RP);

and acquiring a Power Headroom Report (PHR) which is reported by the user equipment and is generated according to the downlink path loss estimated by the minimum value or the average value of the Cell Reference Signals (CRSs) or the channel state information reference signals (CSI-RSs) of the multiple RPs in the uplink CoMP measurement set.

13. The method of claim 12, wherein the measurement configuration information of the RP comprises:

14. The method of claim 12, wherein the measurement configuration information of the RP comprises:

15. The method of claim 12, further comprising:

configuring uplink power control parameters for the user equipment;

PH and PUSCH transmission power.

16. The method of claim 15, further comprising:

configuring downlink path loss reference associated information for the user equipment;

the downlink path loss reference association information is associated with the uplink CoMP measurement set, and is used to instruct the user equipment to acquire downlink path loss according to the CoMP measurement set and instruct to acquire according to the uplink power control parameter:

PH and PUSCH transmission power.

17. The method of any one of claims 12 to 16, further comprising:

receiving a measurement report reported by the user equipment;

and updating the uplink CoMP measurement set according to the measurement report.

18. The method of claim 17, wherein the received measurement report comprises:

and CSI-RS indexes or PCIs corresponding to RPs with RSRP smaller than a first preset threshold value or downlink path loss larger than a second preset threshold value in the uplink CoMP measurement set.

19. The method of claim 17, wherein updating the uplink CoMP measurement set comprises:

deleting the RP corresponding to the RSRP smaller than a first preset threshold value or the downlink path loss larger than a second preset threshold value from the uplink CoMP measurement set; or,

and adding new RP configuration information in the uplink CoMP measurement set.

20. A user device, comprising: the device comprises an acquisition unit, an estimation unit and a reporting unit; wherein,

the acquisition unit is used for acquiring an uplink coordinated multi-point (CoMP) measurement set configured by a service base station, and the uplink CoMP measurement set acquired by the acquisition unit comprises measurement configuration information of a plurality of Receiving Points (RP);

the estimating unit is configured to estimate a downlink path loss according to a minimum value or an average value of cell reference signals CRS or channel state information reference signals CSI-RS of the multiple RPs in the uplink CoMP measurement set acquired by the acquiring unit;

the reporting unit is configured to generate a power headroom report PHR according to the downlink path loss estimated by the estimating unit and report the PHR to the serving base station.

21. The user equipment of claim 20, wherein:

the obtaining unit is further configured to obtain an uplink power control parameter configured by the serving base station; the uplink power control parameter obtained by the obtaining unit is associated with the uplink CoMP measurement set, and is used for indicating that: the power headroom PH and the transmission power of a physical uplink control channel PUCCH or the transmission power of the PH and a physical uplink shared channel PUSCH.

22. The user equipment of claim 20, wherein:

the obtaining unit is further configured to obtain downlink path loss reference association information configured by the serving base station; the downlink path loss reference association information obtained by the obtaining unit is associated with the uplink CoMP measurement set, and is used to instruct obtaining of downlink path loss according to the CoMP measurement set and instruct obtaining according to the uplink power control parameter:

PH and PUSCH transmission power.

23. The user equipment according to any of claims 20 to 22, wherein the estimating unit comprises: a calculation module and a comparison module; wherein,

the calculation module is configured to calculate downlink path losses of all RPs in the uplink CoMP measurement set acquired by the acquisition unit, and notify the calculation module of the downlink path losses;

the comparison module is configured to determine a minimum downlink path loss according to any one of the following manners after comparing the downlink path losses of all RPs according to the notification of the calculation module:

taking the minimum downlink path loss corresponding to the RP in the uplink CoMP measurement set as the estimated downlink path loss; or,

taking the weighted average of the downlink path loss corresponding to the RP in the uplink CoMP measurement set as the estimated downlink path loss; or,

taking the average value or weighted average value of the downlink path loss of n RPs in the uplink CoMP measurement set as a downlink path calculation; and n is a positive integer less than or equal to the number of all RPs in the uplink CoMP measurement set.

24. The ue of claim 23, wherein the reporting unit further comprises: the device comprises a judging module and a triggering module; wherein,

the judging module is used for judging whether the information contained in the uplink CoMP measuring set changes or not and informing the triggering module of the judging result;

the triggering module is configured to receive the notification of the determining module, and trigger a PHR process when configuration information of an RP is added and/or decreased in the uplink CoMP measurement set, or when information included in the uplink CoMP measurement set is reconfigured from a cell reference signal CRS to a CSI-RS, or when information included in the uplink CoMP measurement set is reconfigured from a CSI-RS to a CRS.

25. The user equipment of claim 24, wherein the user equipment further comprises: a detection unit and a transmission unit; wherein,

the detection unit is used for detecting any one of the following information and informing the sending unit of the detection result:

whether the periodic report timer is expired; or,

the Reference Signal Received Power (RSRP) of the RP in the uplink CoMP measurement set and a first preset threshold value; or,

the downlink path loss and a second preset threshold value; or,

the difference value between the downlink path loss estimated by the estimation unit and the minimum RP downlink path loss and a third preset threshold value;

the sending unit is configured to receive a detection result of the detecting unit, and report a measurement report to the serving base station when a periodic report timer is overtime, or when an RSRP of at least one RP in the uplink CoMP measurement set is smaller than a first preset threshold or a downlink path loss is greater than a second preset threshold, or when a difference between an estimated downlink path loss and a downlink path loss of a minimum RP exceeds a third preset threshold, so that the serving base station updates the uplink CoMP measurement set according to the measurement report.

26. A base station, comprising: a configuration unit and a receiving unit; wherein,

the configuration unit is configured to configure an uplink coordinated multi-point (CoMP) measurement set for the user equipment, where the uplink CoMP measurement set configured by the configuration unit includes measurement configuration information of multiple Receiving Points (RPs);

the receiving unit is configured to obtain a power headroom report PHR, which is reported by the user equipment and generated according to a downlink path loss estimated from a minimum value or an average value of cell reference signals CRS or channel state information reference signals CSI-RS of the multiple RPs in the uplink CoMP measurement set.

27. The base station of claim 26, wherein:

the configuration unit is further configured to configure an uplink power control parameter for the ue; the uplink power control parameter is associated with the uplink CoMP measurement set, and is used to instruct to obtain according to the uplink power control parameter:

PH and PUSCH transmission power.

28. The base station of claim 26, wherein:

the configuration unit is further configured to configure downlink path loss reference association information for the user equipment; the downlink path loss reference association information is associated with the uplink CoMP measurement set, and is used to instruct the user equipment to acquire downlink path loss according to the CoMP measurement set and instruct to acquire according to the uplink power control parameter:

PH and PUSCH transmission power.

29. The base station according to any of claims 26 to 28, characterized by:

the receiving unit is further configured to receive a measurement report reported by the user equipment;

the base station further comprises an updating unit, configured to update the uplink CoMP measurement set according to the measurement report received by the receiving unit.