Method and apparatus for uplink transmit power allocation and power headroom reporting

Abstract

Techniques for wireless communications are described, and may include: establishing, by a user equipment (UE), connections with first and second evolved Node Bs (eNBs), wherein each of the eNBs provides radio resources for respective uplink communications to the UE; receiving, at the UE from the first eNB, an indication including an allocation of uplink transmit power between the first eNB and at least the second eNB; and sending, from the UE to the first and second eNBs, the uplink communications based on the indication. The techniques may further include: coordinating, by the first eNB, multi-connection communications of the UE with at least the first and second eNBs; determining, at the eNB, for the UE, an allocation of uplink transmit power between the first eNB and at least the second eNB; and sending, from the first eNB to the UE, an indication including the allocation of the uplink transmit power allocation.

Description

[0001] This application is a divisional application of an application with a filing date of January 29, 2015, application number 201580006186.4, and name “Method and apparatus for uplink transmit power allocation and power headroom reporting”.

[0002] Cross-references

[0003] This patent application claims priority to U.S. Patent Application No. 14 / 607,348, filed by Vajapeyam et al. on January 28, 2015, entitled “Uplink Transmit Power Allocation And Power Headroom Reporting By A User Equipment In A Multi-Connectivity Environment,” and U.S. Provisional Patent Application No. 61 / 933,829, filed by Vajapeyam et al. on January 30, 2014, entitled “Uplink Transmit Power Allocation And Power Headroom Reporting By A User Equipment In A Multi-Connectivity Environment,” each of which is assigned to the assignee of this application. Technical Field

[0004] The following relates generally to wireless communications, and more particularly to selecting coverage enhancement techniques. Background Art

[0005] Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, etc. These systems may be multiple-access systems capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, and orthogonal frequency division multiple access (OFDMA) systems.

[0006] In general, a wireless multiple access communication system may include a number of evolved Node Bs (eNBs), each of which supports communication for multiple user equipments (UEs) simultaneously. The eNBs may communicate with the UEs on both downstream communication links (where data or control signals are sent from the eNB to the UEs) and upstream communication links (where data or control signals are sent from the UEs to the eNBs).

[0007] In a multi-connectivity environment (e.g., multi-flow), a UE may be connected to two or more eNBs simultaneously. Additionally, the UE may be subject to a maximum transmit power constraint. The eNB may attempt to control the uplink transmit power of the UE individually, which may sometimes result in a request for the UE to exceed the appropriate maximum transmit power. Summary of the invention

[0008] The described methods, systems, apparatus and devices generally enable a UE in a multi-connectivity environment to allocate uplink transmit power between a first eNB and a second eNB, or enable the UE to report power headroom to the first eNB or the second eNB, or enable the UE to modify the allocation of uplink transmit power between the first eNB and the second eNB (e.g., borrow power from an eNB or cell and allocate the power to another eNB or cell).

[0009] According to a first aspect of the present disclosure, a method of wireless communication performed by a user equipment (UE) is described. In one embodiment, the method may include: establishing a connection with a first evolved Node B (eNB) and a second eNB, wherein each of the first eNB and the second eNB provides the UE with radio resources for respective uplink communications; receiving at the UE from the first eNB an indication including an allocation of uplink transmit power between the first eNB and at least the second eNB; and sending the uplink communication from the UE to the first eNB and the second eNB based on the indication.

[0010] According to another aspect of the present disclosure, an apparatus for wireless communication by a UE is described. In one configuration, the apparatus may include: means for establishing a connection with a first evolved Node B (eNB) and a second eNB, wherein each of the first eNB and the second eNB provides the UE with radio resources for respective uplink communications; means for receiving, at the UE, from the first eNB an indication including an allocation of uplink transmit power between the first eNB and at least the second eNB; and means for sending the uplink communications from the UE to the first eNB and the second eNB based on the indication.

[0011] According to another aspect of the present disclosure, an apparatus for wireless communication by a UE may include a processor and a memory in electronic communication with the processor. Instructions may be stored in the memory, the instructions being executable by the processor to perform the following: establishing a connection with a first evolved Node B (eNB) and a second eNB, wherein each of the first eNB and the second eNB provides the UE with radio resources for respective uplink communications; receiving at the UE from the first eNB an indication including an allocation of uplink transmit power between the first eNB and at least the second eNB; and sending the uplink communications from the UE to the first eNB and the second eNB based on the indication.

[0012] According to another aspect of the present disclosure, a non-transitory computer-readable medium storing code for wireless communication by a UE is described. The code may include instructions executable to: establish a connection with a first evolved Node B (eNB) and a second eNB, wherein each of the first eNB and the second eNB provides the UE with radio resources for respective uplink communications; receive, at the UE, from the first eNB an indication including an allocation of uplink transmit power between the first eNB and at least the second eNB; and send, from the UE to the first eNB and the second eNB, the uplink communications based on the indication.

[0013] In a specific example of the method, apparatus, device, or non-transitory computer-readable medium described above, when the first eNB or the second eNB operates in time division duplex (TDD) mode, the indication may be based at least in part on an uplink / downlink (UL / DL) configuration of the first eNB or the second eNB. The indication may, for example, include a time index.

[0014] In a specific example of the method, apparatus, device, or non-transitory computer-readable medium described above, the indication may include an indication of a subframe on which substantially all uplink transmit power may be allocated to the first eNB or the second eNB. Additionally or alternatively, the indication includes an allocation of the total uplink transmit power between communications with the first eNB and the second eNB.

[0015] Some examples of the methods, apparatuses, devices, or non-transitory computer-readable media described above may also include: a process, feature, unit, or instruction for generating a power headroom report at the UE, the power headroom report including power headroom information of both the first eNB and the second eNB; and a process, feature, unit, or instruction for sending the power headroom report to the first eNB. The power headroom report may be based at least in part on scheduling information from both the first eNB and the second eNB; and the first eNB and the second eNB may schedule communications with the UE on different sets of resources.

[0016] Some examples of the methods, apparatuses, devices, or non-transitory computer-readable media described above may also include: a process, feature, unit, or instruction for receiving a second indication including an allocation of uplink transmit power from the first eNB in ​​response to the power headroom report, wherein the second indication changes the allocation of uplink transmit power allocated to the first eNB or the second eNB. A power headroom may be determined for the first eNB and the second eNB regarding the uplink transmit power allocated to the first eNB or the second eNB after receiving the second indication.

[0017] Some examples of the methods, apparatuses, devices, or non-transitory computer-readable media described above may also include: a process, feature, unit, or instruction for sending the power headroom report to the first eNB or the second eNB in ​​response to a trigger message received from the first eNB or the second eNB. The trigger message may include an indication that the first eNB or the second eNB has activated an uplink cell.

[0018] Certain examples of the methods, apparatuses, devices, or non-transitory computer-readable media described above may also include a process, feature, unit, or instruction for sending the power headroom report to the second eNB. Sending the power headroom report to the second eNB may be based on a determination that uplink resources are allocated to the UE for uplink transmission to the second eNB.

[0019] In a specific example of the method, apparatus, device, or non-transitory computer-readable medium described above, triggering the power headroom report at the UE may be based on a determination that an allocation of uplink transmit power of the UE to the first eNB or the second eNB has crossed a threshold. The threshold may include a maximum uplink transmit power of the first eNB or the second eNB.

[0020] Certain examples of the methods, apparatuses, devices, or non-transitory computer-readable media described above may further include: a process, feature, unit, or instruction for triggering the power headroom report at the UE based on the measured path loss of the second eNB.

[0021] Some examples of the methods, apparatuses, devices, or non-transitory computer-readable media described above may include: a process, feature, unit, or instruction for generating a power headroom report at the UE, the power headroom report including power headroom information of the second eNB. The methods, apparatuses, or non-transitory computer-readable media described above may further include: a process, feature, unit, or instruction for sending the power headroom report to the second eNB.

[0022] Some examples of the methods, apparatuses, devices, or non-transitory computer-readable media described above may further include: a process, feature, unit, or instruction for modifying, by the UE, the allocation of uplink transmit power between the first eNB and the second eNB. The modification of the allocation of uplink transmit power may be based on the priority of uplink data or control information of one of the eNBs regarding other eNBs in the eNBs. A power headroom report may be triggered at the UE based on the modification of the allocation of uplink transmit power between the first eNB and the second eNB by the UE. The power headroom report may include an indication that the uplink transmit power of one of the first eNB or the second eNB has exceeded the maximum transmit power allocated to the eNB. A second indication may be received from the first eNB, the second indication including an indication of the allocation of uplink transmit power between the first eNB and the second eNB. The second indication may be in response to the modification of the allocation of uplink transmit power between the first eNB and the second eNB by the UE.

[0023] Certain examples of the methods, apparatuses, devices, or non-transitory computer-readable media described above may further include a process, feature, unit, or instruction for determining, based on the indication, allocation of uplink transmit power among multiple cells controlled by the first eNB or the second eNB.

[0024] Certain examples of the methods, apparatuses, devices, or non-transitory computer-readable media described above may also include: a process, feature, unit, or instruction for determining, at the UE, the uplink transmit power of each of a plurality of cells controlled by the first eNB or the second eNB based on the indication.

[0025] In specific examples of the methods, apparatuses, devices, or non-transitory computer-readable media described above, the first eNB may be a master eNB, and the second eNB may be a secondary eNB.

[0026] According to another aspect of the present disclosure, a method of wireless communication is described. In one configuration, the method may include: coordinating, by a first eNB, multi-connection communication of a UE with at least the first eNB and a second eNB; determining, at the eNB, an allocation of uplink transmit power for the UE between the first eNB and at least the second eNB; and sending, from the first eNB to the UE, an indication of the allocation including the uplink transmit power allocation.

[0027] According to another aspect of the present disclosure, an apparatus for wireless communication may include: a unit for coordinating, by a first evolved Node B (eNB), multi-connection communication of a user equipment (UE) with at least the first eNB and a second eNB; a unit for determining, at the eNB, an allocation of uplink transmit power between the first eNB and at least the second eNB for the UE; and a unit for sending an indication of the allocation including the uplink transmit power allocation from the first eNB to the UE.

[0028] According to another aspect of the present disclosure, an apparatus for wireless communication may include: a processor; a memory in electronic communication with the processor; and instructions stored in the memory. The instructions may be executable by the processor to perform the following: coordinating, by a first evolved Node B (eNB), multi-connection communication of a user equipment (UE) with at least the first eNB and a second eNB; determining, at the eNB, for the UE, an allocation of uplink transmit power between the first eNB and at least the second eNB; and sending, from the first eNB to the UE, an indication of the allocation including the uplink transmit power allocation.

[0029] According to another aspect of the present disclosure, a non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable to: coordinate, by a first evolved Node B (eNB), multi-connection communication of a user equipment (UE) with at least the first eNB and a second eNB; determine, at the eNB, for the UE, an allocation of uplink transmit power between the first eNB and at least the second eNB; and, send, from the first eNB to the UE, an indication of the allocation including the uplink transmit power allocation.

[0030] Certain examples of the methods, apparatuses, devices, or non-transitory computer-readable media described above may also include processes, features, units, or instructions for performing the following operations: receiving a power headroom report from the UE, the power headroom report including power headroom information of at least the first eNB and the second eNB; and adjusting the allocation of uplink transmit power between the first eNB and the second eNB for the UE based on the power headroom report.

[0031] Certain examples of the methods, apparatuses, devices, or non-transitory computer-readable media described above may further include: a process, feature, unit, or instruction for adjusting the allocation of uplink transmit power between the first eNB and the second eNB may be determined based on the power headroom report. The methods, apparatuses, devices, or non-transitory computer-readable media described above may include: a process, feature, unit, or instruction for sending the adjusted allocation of uplink transmit power to at least one of the UE or the second eNB. The power headroom report may be received in response to at least one of: an uplink transmit power of the UE for the second eNB; a measured change in the path loss of the second eNB; or an activation of an uplink cell by the second eNB.

[0032] Certain examples of the methods, apparatuses, devices, or non-transitory computer-readable media described above may also include: a process, feature, unit, or instruction for determining that the UE has modified the allocation of uplink transmit power between the first eNB and the second eNB based on the power headroom report. The adjusted allocation of uplink transmit power between the first eNB and the second eNB for the UE may be based on the modification made by the UE to the allocation of uplink transmit power between the first eNB and the second eNB.

[0033] Certain examples of the methods, apparatuses, devices, or non-transitory computer-readable media described above may also include: a process, feature, unit, or instruction for sending the power headroom report from the first eNB to the second eNB.

[0034] Certain examples of the methods, apparatuses, devices, or non-transitory computer-readable media described above may also include processes, features, units, or instructions for adjusting the allocation of uplink transmit power between the first eNB and the second eNB based on a message received at the first eNB from the second eNB.

[0035] In a specific example of the method, apparatus, device, or non-transitory computer-readable medium described above, the allocation of uplink transmit power between the first eNB and the second eNB can be based at least in part on an uplink / downlink (UL / DL) configuration of the first eNB or the second eNB.

[0036] In specific examples of the methods, apparatuses, devices, or non-transitory computer-readable media described above, the indication may include a time index.

[0037] In a specific example of the method, apparatus, device, or non-transitory computer-readable medium described above, the allocation of uplink transmit power between the first eNB and the second eNB may include allocation of uplink transmit power between multiple cells of the first eNB or the second eNB.

[0038] Some examples of the methods, apparatuses, devices, or non-transitory computer-readable media described above may also include: a process, feature, unit, or instruction for sending the allocation of uplink transmit power from the first eNB to the second eNB. Sending the allocation of uplink transmit power from the first eNB to the second eNB may include: sending a message including the allocation of uplink transmit power over an X2 interface between the first eNB and the second eNB.

[0039] Certain examples of the methods, apparatuses, devices, or non-transitory computer-readable media described above may further include a process, feature, unit, or instruction for scheduling communication between the UE and the first eNB independently of communication between the UE and the second eNB.

[0040] In specific examples of the methods, apparatuses, devices, or non-transitory computer-readable media described above, the first eNB may be a master eNB and the second eNB may be a secondary eNB.

[0041] Further scope of applicability of the described methods, devices, apparatuses, and non-transitory computer-readable media will become apparent from the following detailed description, claims, and drawings. Detailed descriptions and specific examples are given by way of illustration only, as various changes and modifications within the spirit and scope of the description will become apparent to those skilled in the art. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] A further understanding of the nature and advantages of the present invention may be achieved by reference to the following drawings. In the drawings, similar components or features may have the same reference numerals. Further, various components of the same type may be distinguished by following the reference numeral with a dash and a second reference numeral that distinguishes between the similar components. If only the first reference numeral is used in the specification, the description applies to any one of the similar components having the same first reference numeral, without regard to the second reference numeral.

[0043] Figure 1 A block diagram of a wireless communication system according to various aspects of the present disclosure is shown;

[0044] Figure 2 A block diagram of a wireless communication system according to various aspects of the present disclosure is shown;

[0045] Figure 3 illustrates a message flow between a UE, a first eNB, and at least a second eNB according to various aspects of the present disclosure;

[0046] Figure 4 illustrates a message flow between a UE, a first eNB, and at least a second eNB according to various aspects of the present disclosure;

[0047] Figure 5 illustrates a message flow between a UE, a first eNB, and at least a second eNB according to various aspects of the present disclosure;

[0048] Figure 6 A block diagram illustrating an example of a device that may be used for wireless communications according to various aspects of the present disclosure;

[0049] Figure 7 A block diagram illustrating an example of a device that may be used for wireless communications according to various aspects of the present disclosure;

[0050] Figure 8 A block diagram illustrating an example of a device that may be used for wireless communications according to various aspects of the present disclosure;

[0051] Fig. 9 A block diagram illustrating an example of a device that may be used for wireless communications according to various aspects of the present disclosure;

[0052] Fig.10 A block diagram illustrating an example of a device that may be used for wireless communications according to various aspects of the present disclosure;

[0053] Fig.11 A block diagram of a UE configured for wireless communication according to various aspects of the present disclosure is shown;

[0054] Fig.12A block diagram illustrating an eNB configured for wireless communications according to various aspects of the present disclosure is shown;

[0055] Fig.13 is a flow chart illustrating a method of wireless communication by a UE according to various aspects of the present disclosure;

[0056] Fig.14 is a flow chart illustrating a method of wireless communication by a UE according to various aspects of the present disclosure;

[0057] Fig.15 is a flow chart illustrating a method of wireless communication by a UE according to various aspects of the present disclosure;

[0058] Fig.16 is a flow chart illustrating a method of wireless communication according to various aspects of the present disclosure; and

[0059] Fig.17 is a flow chart illustrating a method of wireless communication by a UE according to various aspects of the present disclosure. DETAILED DESCRIPTION

[0060] In a multi-connection environment, such as a multi-flow environment, a UE may be connected to two or more eNBs simultaneously. In such an environment, a UE may concurrently provide a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH) for each eNB to which the UE is connected. Additionally, the UE may be subject to a maximum transmit power constraint that collectively affects all uplink communications. Therefore, as described herein, to prevent the UE from exceeding its maximum transmit power, the eNBs to which the UE is connected may coordinate with each other to determine the allocation of uplink transmit power between the eNBs. To assist in making this determination, a power headroom report from a UE to one of the eNBs may include power headroom information for each of the eNBs to which the UE is currently connected.

[0061] Wireless communication systems such as 3GPP "Long Term Evolution" (LTE) or "LTE-Advanced" (LTE-A) wireless communication systems may specify various modes of communication between a UE and one or more eNBs. Some of the modes of communication enable a UE to be simultaneously connected to multiple cells of one or more eNBs.

[0062] In the carrier aggregation mode of communication, a UE in the RRC connected state (RRC_CONNECTED) can connect to multiple cells of a single eNB and consume radio resources provided by each of the cells. Because all of the cells are managed by a single eNB, communications between the UE and the multiple cells can be scheduled by a single eNB, and there can be close coordination between the cells.

[0063] In the coordinated multi-point (CoMP) mode of communication, a UE in the RRC connected state can consume radio resources provided by more than one eNB. Although the cells are managed by more than one eNB, there may be close coordination between the cells. This close coordination can be provided, for example, because the communication is performed over the same carrier or because of an ideal backhaul between multiple eNBs. An ideal backhaul can enable fast transmission of feedback between multiple eNBs. In addition, the communication between the UE and multiple eNBs can be scheduled by a single eNB.

[0064] In a multi-connection communication mode, a UE in an RRC connected state can be connected to multiple cells managed by more than one eNB and consume radio resources provided by each of the eNBs. Examples of multi-connection include, but are not limited to, multi-flow and dual connection. However, because communications with different eNBs can be performed over different carriers and independently scheduled by different eNBs, and because there may be a non-ideal backhaul for slower transmission that provides feedback between eNBs, there is as much loose coordination as possible between cells of different eNBs.

[0065] The technology described herein is not limited to LTE / LTE-A wireless communication systems, and can also be used for various wireless communication systems such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA and other systems. The terms "system" and "network" are usually used interchangeably. A CDMA system can implement wireless technologies such as CDMA2000, Universal Terrestrial Radio Access (UTRA), etc. CDMA2000 covers IS-2000, IS-95 and IS-856 standards. IS-2000 versions 0 and A are commonly referred to as CDMA20001X, 1X, etc. IS-856 (TIA-856) is commonly referred to as CDMA20001xEV-DO, High Speed ​​Packet Data (HRPD), etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. A TDMA system can implement wireless technologies such as Global System for Mobile Communications (GSM). OFDMA systems can implement wireless technologies such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash OFDM, etc. UTRA and E-UTRA are part of Universal Mobile Telecommunications System (UMTS). LTE and Advanced LTE (LTE-A) are new versions of UMTS using E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). The technology described herein can be used for the systems and wireless technologies mentioned above as well as other systems and wireless technologies. However, the following description describes an LTE / LTE-A wireless communication system for example purposes, and LTE / LTE-A terms are used in many places in the following description, although the technology is applicable beyond LTE / LTE-A applications.

[0066] The following description provides examples, rather than limitations on the scope, applicability, or configuration set forth in the claims. Changes may be made in the functions and arrangements of the elements discussed without departing from the spirit and scope of the present disclosure. Various embodiments may omit, replace, or add various processes or components as appropriate. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, the features described with respect to a particular embodiment may be combined in other embodiments.

[0067] Figure 1A block diagram of a wireless communication system 100 according to various aspects of the present disclosure is shown. The wireless communication system 100 may include multiple evolved Node Bs (eNBs) 105 and eNBs 135, some user equipments (UEs) 115, and a core network 130. Some of the eNBs 105 or 135 may transmit control information or user data to the core network 130 via a backhaul 132. In some embodiments, some of the eNBs 105 or 135 may communicate with each other directly or indirectly via a backhaul link 134, which may be a wired or wireless communication link. The wireless communication system 100 may support operations on multiple carriers (waveform signals of different frequencies). A multi-carrier transmitter may send modulated signals on multiple carriers simultaneously. For example, each communication link 125 may be a multi-carrier signal modulated according to various wireless technologies. Each modulated signal may be sent on a different carrier and may carry control information (e.g., reference signals, control channels, etc.), overhead information, data, etc.

[0068] The eNB 105 or 135 may communicate wirelessly with the UE 115 via one or more eNB antennas. Each of the eNBs 105 or 135 may provide communication coverage for a respective coverage area 110. In some embodiments, the eNB 105 or 135 may be referred to as or include a base station, a base transceiver station (BTS), a wireless base station, a wireless transceiver, a basic service set (BSS), an extended service set (ESS), an evolved Node B (eNB), a home evolved Node B, or some other suitable term. The coverage area 110 of the eNB 105 or 135 may be divided into sectors (not shown) that constitute only a portion of the coverage area. The wireless communication system 100 may include different types of eNBs 105 or 135 (e.g., macro eNBs, micro eNBs, or pico eNBs). The eNBs 105 or 135 may be associated with the same or different access networks or mobile network operators (MNO) deployments. The coverage areas of different eNBs 105 or 135 (including coverage areas of eNBs of the same or different types belonging to the same or different MNOs or access networks) may overlap.

[0069] In some embodiments, the wireless communication system 100 may include an LTE / LTE-A wireless communication system (or network). The wireless communication system 100 may be a heterogeneous LTE / LTE-A / LTE-U network in which different types of eNBs provide coverage for various geographic areas. For example, each eNB 105 or 135 may provide communication coverage for a macro cell, a pico cell, a femto cell, or other types of cells. Small cells such as pico cells, femto cells, or other types of cells may include low power nodes or LPNs. Macro cells will generally cover a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by UEs with service subscriptions to network providers. Pico cells will generally cover relatively small geographic areas and may allow unrestricted access by UEs with service subscriptions to network providers. Femto cells will also generally cover relatively small geographic areas (e.g., residential), and in addition to unrestricted access, may also provide restricted access by UEs with associations with femto cells (e.g., UEs in a closed subscriber group (CSG), UEs of users in residential areas, etc.). An eNB for a macro cell may be referred to as a macro eNB. An eNB for a pico cell may be referred to as a pico eNB. And, an eNB for a femto cell may be referred to as a femto eNB or a home eNB. One eNB may support one or more (eg, two, three, four, etc.) cells.

[0070] The core network 130 may communicate with the eNB 105 or 135 via a backhaul 132 or 134 (e.g., S1 application protocol, etc.). The eNB 105 or 135 may also communicate with each other, directly or indirectly, for example, via the backhaul link 134 (e.g., via an X2 interface, etc.) or via the backhaul 132 (e.g., through the core network 130). The wireless communication system 100 may support synchronous or asynchronous operation. For synchronous operation, the eNBs may have similar frames or gating timings, and transmissions from different eNBs may be approximately aligned in time. For asynchronous operation, the eNBs may have different frames or gating timings, and transmissions from different eNBs may not be aligned in time. The techniques described herein may be used for synchronous or asynchronous operation.

[0071] UE 115 may be dispersed throughout the wireless communication system 100, and each UE 115 may be fixed or mobile. UE 115 may also be referred to by those skilled in the art as a mobile device, mobile station, user station, mobile unit, user unit, wireless unit, remote unit, wireless device, wireless communication device, remote device, mobile user station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term. UE 115 may be a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a wearable item such as a watch or glasses, a wireless local loop (WLL) station, etc. UE 115 may be able to communicate with a macro eNB, a micro eNB, a femto eNB, a repeater, etc. UE 115 may also be able to communicate through different access networks such as a cellular or other WWAN access network or a WLAN access network.

[0072] The communication links 125 shown in the wireless communication system 100 may include an uplink for carrying uplink (UL) transmissions (e.g., from the UE 115 to the eNB 105 or 135) or a downlink for carrying downlink (DL) transmissions (e.g., from the eNB 105 or 135 to the UE 115). UL transmissions may also be referred to as reverse link transmissions, while DL transmissions may also be referred to as forward link transmissions. In some cases, UL or DL ​​transmissions may be performed using MIMO communications (e.g., spatially multiplexed communications).

[0073] As noted above, a UE 115 may be connected to multiple eNBs 105 simultaneously. In a multi-connection (e.g., multi-flow) arrangement, each of the eNBs 105 to which the UE 115 is connected may independently schedule uplink and downlink transmissions between the UE 115 and the eNB 105. In order to prevent the UE 115 from exceeding a maximum transmit power appropriate for the UE 115, the eNBs 105 may communicate with each other to determine an allocation of uplink transmit power (e.g., a power allocation, a percentage allocation such as a percentage of uplink transmit power, etc.) between the eNBs to which the UE 115 is currently connected. The allocation may be signaled to the UE 115 by one or more of the eNBs 105 and may change over time. By transmitting on the uplink according to the received allocation, the UE 115 may be prevented from exceeding the maximum transmit power set by the eNB 105.

[0074] Figure 2A block diagram of a wireless communication system 200 according to various aspects of the present disclosure is shown. The wireless communication system 200 may include a UE 115-a, a first eNB 105-a, and a second eNB 135-a. The UE 115-a, the first eNB 105-a, or the second eNB 135-a may be a reference Figure 1 Respective examples of aspects of the described UE 115, eNB 105, or eNB 135. In certain embodiments, the first eNB 105-a may include a master eNB (MeNB) and the second eNB 135-a may include a secondary eNB (SeNB).

[0075] In one mode of operation, the first eNB 105-a may coordinate multi-connection communications for the UE 115-a, wherein the UE 115-a may communicate with one or more cells of the first eNB 105-a (e.g., a primary cell group (MCG) managed by the first eNB 105-a) via a communication link (or multiple communication links) 125-a and with one or more cells of the second eNB 135-a (e.g., a secondary cell group (SCG) managed by the second eNB 135-a) via a communication link (or multiple communication links) 125-b. The first eNB 105-a and the second eNB 135-a may send feedback information via a non-ideal backhaul link 134-a (e.g., a backhaul link implementing an X2 interface).

[0076] The first eNB 105-a and the second eNB 135-a may use different medium access control (MAC) entities with no coordination or with very loose coordination.

[0077] In the wireless communication system 200, a contention situation may occur in which the total uplink transmit power requested by the first eNB 105-a and the second eNB 135-a of the UE 115-a exceeds the available uplink transmit power of the UE 115-a. Such a contention situation may adversely affect the performance of the UE. Techniques for allocating the available uplink transmit power of the UE between the first eNB 105-a and the second eNB 135-a (or between more than two eNBs) may therefore be useful. The techniques may adapt power headroom reporting to a multi-connectivity environment.

[0078] Now turn to Figure 3 , illustrates a message flow 300 between a UE 115-b, a first eNB 105-b, and at least a second eNB 135-b according to various aspects of the present disclosure. Each of the UE 115-b, the first eNB 105-b, or the second eNB 135-b may be a reference Figure 1Or an example of aspects of each of the UE 115, the first eNB 105, or the second eNB 135 described in 2. In some cases, the first eNB 105-b may include a master eNB and the second eNB 135-b may include a secondary eNB.

[0079] In the following description of message flow 300, messages between UE 115-b, first eNB 105-b, or second eNB 135-b may be sent in an order different from the exemplary order shown, or operations performed by UE 115-b, first eNB 105-b, or second eNB 135-b may be performed in a different order or at a different time. Specific messages or operations may also be placed outside of message flow 300, or other messages or operations may be added to message flow 300.

[0080] The message flow 300 may begin with the UE 115-b establishing a connection 305 with the first eNB 105-b and a connection 315 with the second eNB 135-b. Each of the first eNB 105-b and the second eNB 135-b may provide the UE 115-b with radio resources for respective uplink communications. Each of the first eNB 105-b and the second eNB 135-b may also provide the UE 115-b with radio resources for respective downlink communications. At box 310, the first eNB 105-b may be used to coordinate multi-connection communications of the UE 115-b with the first eNB 105-b and the second eNB 135-b. In order to assist the first eNB 105-b in coordinating the multi-connection communications of the UE 115-b, the first eNB 105-b may send or receive backhaul communications 320 with the second eNB 135-b. In some embodiments, the first eNB 105-b and the second eNB 135-b may communicate with the UE 115-b using different carriers and, therefore, may send or receive backhaul communications 320 via a non-ideal backhaul link (e.g., a backhaul link implementing an X2 interface).

[0081] At block 325, the first eNB 105-b may determine an allocation (e.g., a power allocation, a percentage allocation such as a percentage of the uplink transmit power, etc.) of uplink transmit power for the UE 115-b between the first eNB 105-b and at least the second eNB 135-b. The uplink transmit power may be a maximum uplink transmit power in some cases.

[0082] When the determination is made at block 325, the first eNB 105-b may send an indication 330 of an allocation of uplink transmit power between the first eNB 105-b and at least the second eNB 135-b to the UE 115-b. In some cases, an indication 335 may also be sent to the second eNB 135-b. The indication 330, 335 of the allocation of uplink transmit power may, in some cases, include an indication of a maximum uplink transmit power or a percentage of the maximum uplink transmit power allocated to each of the first eNB 105-b and at least the second eNB 135-b.

[0083] In some examples, such as when the first eNB 105-b or the second eNB 135-b operates in TDD mode, the indication 330 of the allocation of uplink transmit power between the first eNB 105-b and at least the second eNB 135-b can be based at least in part on the UL / DL configuration of the first eNB 105-b or the second eNB 135-b. For example, when the eNB operates in TDD mode, the number of active uplink carriers can change over time based on the TDD configuration of each cell within the eNB. When the number of active uplink carriers used by the eNB is less during a particular time period, more of the total uplink transmit power available to the UE 115-b during the time period can be allocated to another eNB with which the UE 115-b can communicate during the time period. Conversely, when the number of active uplink carriers used by the eNB is greater during a particular time period, more of the total uplink transmit power available to the UE 115-b during the time period can be allocated to the eNB.

[0084] In some examples, the indication 330 of the allocation of uplink transmit power between the first eNB 105-b and at least the second eNB 135-b may include an indication of a subframe on which substantially all transmit power may be allocated to the first eNB 105-b or the second eNB 135-b. For example, substantially all uplink transmit power may be allocated to one or more other eNBs during subframes or time periods in which uplink communications to the eNB are not expected.

[0085] In some cases, the indication 330 may include a time index. The time index may be used to indicate a subframe or time period in which the eNB is assigned a specific uplink transmit power, and may be used to assign different uplink transmit powers to different eNBs within a subframe or time period. Thus, in a specific example, the indication 330 may include a set of values ​​parameterized by the time index.

[0086] At block 340, and in some variations, the UE 115-b may determine an allocation of uplink transmit power among a plurality of cells of the first eNB 105-b or the second eNB 135-b based on the indication 330 of the allocation of uplink transmit power among the first eNB 105-b and at least the second eNB 135-b. The allocation of uplink transmit power among the plurality of cells may in some cases be semi-statically specified in the indication 330 (e.g., the first eNB 105-b may specify or configure an uplink transmit power value for each cell that may be used by the UE until the UE receives an adjusted indication from the first eNB 105-b of the allocation of uplink transmit power among the first eNB 105-b and at least the second eNB 135-b). The allocation of uplink transmit power among the multiple cells may in other cases be semi-statically specified in the indication according to a time index (e.g., the first eNB 105-b may specify or configure multiple uplink transmit power values ​​for each cell for each time index, which uplink transmit power values ​​may be used by UE115-b until UE 115-b receives an adjusted indication from the first eNB 105-b including the allocation of uplink transmit power between the first eNB 105-b and at least the second eNB 135-b).

[0087] At block 340, the indication 330 of an allocation of uplink transmit power between the first eNB 105-b and at least the second eNB 135-b may include an allocation of the total transmit power between communications with the first eNB 105-b and the second eNB 135-b. In these embodiments, the UE 115-b may determine, at the UE 115-b, an uplink transmit power for each of a plurality of cells controlled by the first eNB 105-b or the second eNB 135-b based on the indication of an allocation of uplink transmit power between the first eNB 105-b and at least the second eNB 135-b. In some cases, the uplink transmit power per cell (e.g., a maximum uplink transmit power per cell) may be dynamically adjusted at the UE 115-b.

[0088] At block 345, the first eNB 105-b may schedule communications (including uplink communications) between the UE 115-b and the first eNB 105-b. At block 350, the second eNB 135-b may independently schedule communications (including uplink communications) between the UE 115-b and the second eNB 135-b. Upon receiving the scheduling information 355 or 360, the UE 115-b may send uplink communications 365 to the first eNB 105-b and uplink communications 370 to the second eNB 135-b based on the indication 330 of the allocation of uplink transmit power for the UE 115-b between the first eNB 105-b and at least the second eNB 135-b.

[0089] Figure 4 4 shows a message flow 400 between a UE 115-c, a first eNB 105-c, and at least a second eNB 135-c according to various aspects of the present disclosure. Each of the UE 115-c, the first eNB 105-c, or the second eNB 135-c may be a reference Figure 1 , 2 3 or 3. In some cases, the first eNB 105-c may include a master eNB and the second eNB 135-c may include a secondary eNB.

[0090] In the following description of message flow 400, messages between UE 115-c, first eNB 105-c, or second eNB 135-c may be sent in an order different from the exemplary order shown, or operations performed by UE 115-c, first eNB 105-c, or second eNB 135-c may be performed in a different order or at a different time. Specific messages or operations may also be placed outside of message flow 400, or other messages or operations may be added to message flow 400.

[0091] The message flow 400 may begin with the UE 115-c having established a connection 405 with the first eNB 105-c and a connection 415 with the second eNB 135-c. Each of the first eNB 105-c and the second eNB 135-c may provide the UE 115-c with radio resources for respective uplink communications. Each of the first eNB 105-c and the second eNB 135-c may also provide the UE 115-c with radio resources for respective downlink communications. The first eNB 105-c may be used at block 410 to coordinate multi-connection communications of the UE 115-c with the first eNB 105-c and the second eNB 135-c. To assist the first eNB 105-c in coordinating multi-connection communications of the UE 115-c, the first eNB 105-c may send or receive backhaul communications 420 with the second eNB 135-c. In certain embodiments, the first eNB 105 - c and the second eNB 135 - c may communicate with the UE 115 - c using different carriers and, therefore, may send or receive backhaul communications 420 via a non-ideal backhaul link (eg, a backhaul link implementing an X2 interface).

[0092] When sending uplink communications to the first eNB 105-c and the second eNB 135-c, the UE 115-c may send the uplink communications based on an indication of an allocation of uplink transmit power for the UE 115-c between the first eNB 105-c and at least the second eNB 135-c. The indication may be provided by the first eNB 105-c to the UE 115-c.

[0093] At block 425, the first eNB 105-c may schedule communications, including uplink communications, between the UE 115-c and the first eNB 105-c. At block 430, the second eNB 135-c may independently schedule communications, including uplink communications, between the UE 115-c and the second eNB 135-c. Upon receiving the scheduling information 435 or 440, the UE 115-c may send uplink communications to the first eNB 105-c or the second eNB 135-c based on the current indication of the allocation of uplink transmit power for the UE 115-c between the first eNB 105-c and at least the second eNB 135-c.

[0094] At block 445, the UE 115-c may generate a power headroom report for an eNB (e.g., a first eNB 105-c or a second eNB 135-c). The triggering of the generation of the power headroom report for the eNB (e.g., the first eNB 105-c or the second eNB 135-c) may be based on a condition of the eNB or a neighboring eNB (e.g., an eNB other than the eNB for which the power headroom report is triggered). As an example, the condition of the eNB or the neighboring eNB may be a determination that an uplink transmit power of the UE 115-c for the eNB or the neighboring eNB has crossed a threshold. In some cases, the threshold may include a maximum uplink power of the eNB. As a further example, the condition of the eNB or the neighboring eNB may be a measured path loss of the eNB or the neighboring eNB (e.g., a path loss change that satisfies a threshold). As yet a further example, the condition of the eNB or the neighboring eNB may be a determination that the eNB or the neighboring eNB has activated an uplink cell.

[0095] The power headroom report may include power headroom information for both the first eNB 105-c and the second eNB 135-c. Alternatively, the power headroom information may be only for the eNB 135 that triggered the power headroom report. Including power headroom information for both the first eNB 105-c and the second eNB 135-c may reduce power headroom reporting overhead and enable the eNBs to estimate the total uplink transmit power used by the UE 115-c. In some examples, the power headroom information may be calculated on a cell-by-cell basis as follows:

[0096] PH(cell)=maximum power(cell)-actual transmit power(cell), (Equation 1) where PH(cell) is the power headroom of the cell, maximum power(cell) is the maximum uplink transmit power of the cell, and actual transmit power(cell) is the current actual uplink transmit power of the cell.

[0097] In some cases, the power headroom report may be automatically sent to the eNB for which the power headroom report is triggered. In other cases, the power headroom report may be sent to the eNB for which the power headroom report is triggered in response to a trigger message received from the eNB. In the latter case, and by way of example, a power headroom report 455 triggered for the first eNB 105-c may be sent to the first eNB 105-c in response to a trigger message (e.g., a power headroom request 450) received from the first eNB 105-c.

[0098] The power headroom report may be sent to the first eNB 105-c or the second eNB 135-c. In some cases, the power headroom report may be sent to the eNB for which the power headroom report is triggered (e.g., as indicated by the transmission of the power headroom report 455, the power headroom report 455 triggered for the first eNB 105-c may be sent to the first eNB 105-c). In other cases, the power headroom report may be sent to the eNB for which the power headroom report is triggered and to the neighboring eNBs (e.g., as indicated by the transmission of the power headroom report 455 and the power headroom report 455-a, the power headroom report 455 triggered for the first eNB 105-c may be sent to the first eNB 105-c and the second eNB 135-b). In the latter case, the UE 115-c may, in some cases, send the power headroom report to the neighboring eNB based on determining that uplink resources are allocated to the UE 115-c for uplink transmission to the neighboring eNB. In some cases, as indicated by the transmission of the power headroom report 455-b from the second eNB 135-c to the first eNB 105-c, the eNB for which the power headroom report is triggered may send (e.g., relay) the power headroom report to another eNB. In additional or alternative examples, the first eNB 105-c and the second eNB 135-b may exchange the power headroom report 135-b received from the UE 115-c via a backhaul between the first eNB 105-c and the second eNB 135-c.

[0099] At block 460, the first eNB 105-c may adjust an allocation of uplink transmit power for the UE 115-c between the first eNB 105-c and the second eNB 135-c. The allocation may be adjusted based on the power headroom report 455.

[0100] When the adjustment is made at block 460, the first eNB 105-c may send an indication 465 of an allocation of uplink transmit power between the first eNB 105-c and at least the second eNB 135-c to the UE 115-c. In some cases, an indication 470 may also be sent to the second eNB 135-c. The indications 465, 470 of the allocation of uplink transmit power may, in some cases, include an indication of a maximum uplink transmit power or a percentage of uplink transmit power allocated to each of the first eNB 105-c and at least the second eNB 135-c.

[0101] When the first eNB 105-c or the second eNB 135-c operates in TDD mode, the indication 465 of the allocation of uplink transmit power between the first eNB 105-c and at least the second eNB 135-c can be based at least in part on the UL / DL configuration of the first eNB 105-c or the second eNB 135-c. For example, when the eNB operates in TDD mode, the number of active uplink carriers can change over time based on the TDD configuration of each cell within the eNB. When the number of active uplink carriers used by the eNB is less during a particular time period, more of the total uplink transmit power available to the UE during the time period can be allocated to another eNB with which the UE can communicate during the time period. Conversely, when the number of active uplink carriers used by the eNB is greater during a particular time period, more of the total uplink transmit power available to the UE during the time period can be allocated to the eNB.

[0102] The indication 465 of uplink transmit power between the first eNB 105-c and at least the second eNB 135-c may include an indication of subframes over which substantially all transmit power may be allocated to the first eNB 105-c or the second eNB 135-c. For example, substantially all uplink transmit power may be allocated to one or more other eNBs during subframes or time periods in which uplink communications to the eNB are not expected.

[0103] In some cases, the indication 465 may include a time index. The time index may be used to indicate a subframe or time period in which an eNB is allocated a specific uplink transmit power, and may be used to allocate different uplink transmit powers to different eNBs within a subframe or time period.

[0104] At box 475, and after receiving the indication of uplink transmit power 465, the UE 115-c can determine the power headroom of the first eNB 105-c and the second eNB 135-c relative to the uplink transmit power allocated to the first eNB 105-c or the second eNB 135-c in the indication of uplink transmit power 465.

[0105] Figure 5 5 shows a message flow 500 between a UE 115-d, a first eNB 105-d, and at least a second eNB 135-d according to various aspects of the present disclosure. Each of the UE 115-d, the first eNB 105-d, or the second eNB 135-d may be a reference Figure 1 , 2, 3, or 4 describe examples of aspects of each of the UE 115, the first eNB 105, or the second eNB 135. In some cases, the first eNB 105-d may include a master eNB and the second eNB 135-d may include a secondary eNB.

[0106] In the following description of message flow 500, messages between UE 115-d, first eNB 105-d, or second eNB 135-d may be sent in an order different from the exemplary order shown, or operations performed by UE 115-d, first eNB 105-d, or second eNB 135-d may be performed in a different order or at a different time. Specific messages or operations may also be placed outside of message flow 500, or other messages or operations may be added to message flow 500.

[0107] The message flow 500 may begin with the UE 115-d having established a connection 505 with the first eNB 105-d and a connection 515 with the second eNB 135-d. Each of the first eNB 105-d and the second eNB 135-d may provide the UE 115-d with radio resources for respective uplink communications. Each of the first eNB 105-d and the second eNB 135-d may also provide the UE 115-d with radio resources for respective downlink communications. The first eNB 105-d may be used at block 510 to coordinate multi-connection communications of the UE 115-d with the first eNB 105-d and the second eNB 135-d. To assist the first eNB 105-d in coordinating the multi-connection communications of the UE 115-d, the first eNB 105-d may send or receive communications 520 with the second eNB 135-d. In certain embodiments, the first eNB 105 - d and the second eNB 135 - d may communicate with the UE 115 - d using different carriers and, therefore, may send or receive communications 520 via a non-ideal backhaul link (eg, a backhaul link implementing an X2 interface).

[0108] When sending uplink communications to the first eNB 105-d and the second eNB 135-d, the UE 115-d may send the uplink communications based on an indication of an allocation of uplink transmit power for the UE 115-d between the first eNB 105-d and at least the second eNB 135-d. The indication may be provided by the first eNB 105-d to the UE 115-d.

[0109] At box 525, the UE 115-d may modify the allocation of uplink transmit power between the first eNB 105-d and the second eNB 135-d (or the allocation of uplink transmit power between cells). In some cases, the UE 115-d may modify the allocation of uplink transmit power by borrowing uplink transmit power allocated to one eNB or cell and reallocating the borrowed uplink transmit power to another eNB or cell. The modification of the allocation of uplink transmit power may in some cases be based on the priority of uplink data or control information of one of the eNBs (e.g., the first eNB 105-d or the second eNB 135-d) with respect to the other eNBs in the eNBs. The modification may also or may alternatively be based on the priority of uplink data or control information of the cells. The modification may also or may alternatively be based on the uplink not being used by the eNB or cell.

[0110] At block 530, generation of a power headroom report may be triggered based on a modification of an allocation of uplink transmit power between the first eNB 105-d and the second eNB 135-d (or between cells of one or more of the first eNB 105-d and the second eNB 135-d). In some cases, the power headroom report may include an indication that an uplink transmit power of one of the first eNB 105-d or the second eNB 135-d has exceeded a maximum transmit power allocated to the eNB.

[0111] The power headroom report may include power headroom information for both the first eNB 105-d and the second eNB 135-d. Including power headroom information for both the first eNB 105-d and the second eNB 135-d may reduce power headroom reporting overhead and enable the eNBs to estimate the total uplink transmit power used by the UE 115-e. In some examples, the power headroom information may be calculated using Equation 1.

[0112] The power headroom report 535 may be sent to the first eNB 105-d or the second eNB 135-d. In some cases, the power headroom report may be sent to the eNB that received power during the modification of the allocation of uplink transmit power. Such a power headroom report may include negative power headroom information. In other cases, the power headroom report may be sent to the eNB from which power was borrowed during the modification of the allocation of uplink transmit power. The latter power headroom report may subtract the borrowed power from the allocated maximum power of the eNB or cell. In the case of power headroom information per cell, the power headroom information may be calculated as:

[0113] PH(cell) = maximum power(cell) - actual transmit power(cell) - borrowed power(cell), (Equation 2)

[0114] The borrowed power (cell) is the power borrowed from the cell.

[0115] At block 540, the first eNB 105-d may adjust an allocation of uplink transmit power for the UE 115-d between the first eNB 105-d and the second eNB 135-d. The allocation may be adjusted based on the power headroom report 535.

[0116] When the adjustment is made at block 540, the first eNB 105-d may send an indication 545 of an allocation of uplink transmit power between the first eNB 105-d and at least the second eNB 135-d to the UE 115-d. In some cases, an indication 550 may also be sent to the second eNB 135-d. The indications 545, 550 of the allocation of uplink transmit power may, in some cases, include an indication of a maximum uplink transmit power allocated to each of the first eNB 105-d and at least the second eNB 135-d.

[0117] In certain embodiments, such as when the first eNB 105-d or the second eNB 135-d operates in TDD mode, the indication 545 of the uplink transmit power between the first eNB 105-d and at least the second eNB 135-d can be based at least in part on the UL / DL configuration of the first eNB 105-d or the second eNB 135-d. For example, when the eNB operates in TDD mode, the number of active uplink carriers can change over time based on the TDD configuration of each cell within the eNB. When the number of active uplink carriers used by the eNB is low during a particular time period, more of the total uplink transmit power available to the UE 115-d during the time period can be allocated to another eNB with which the UE 115-d can communicate during the time period. Conversely, when the number of active uplink carriers used by the eNB is large during a particular time period, more of the total uplink transmit power available to the UE 115-d during the time period can be allocated to the eNB.

[0118] In some embodiments, the indication 545 of the allocation of uplink transmit power between the first eNB 105-d and at least the second eNB 135-d may include an indication of a subframe over which substantially all transmit power may be allocated to the first eNB 105-d or the second eNB 135-d. For example, substantially all uplink transmit power may be allocated to one or more other eNBs during a subframe or time period in which uplink communications to the eNB are not expected.

[0119] In some cases, the indication 545 may include a time index. The time index may be used to indicate a subframe or time period during which an eNB is assigned a specific uplink transmit power, and may be used to assign different uplink transmit powers to different eNBs within a subframe or time period.

[0120] At box 555, and after receiving the indication of uplink transmit power 545, UE115-d can determine the power headroom of the first eNB 105-d and the second eNB 135-d relative to the uplink transmit power allocated to the first eNB 105-d or the second eNB 135-d in the indication of uplink transmit power 545.

[0121] Reference now Figure 6 , block diagram 600 illustrates an example of a device 605 that can be used for wireless communication according to various aspects of the present disclosure. The device 605 can be a reference Figure 1 , 2 , 3, 4 or 5. The device 605 may also be a processor. The device 605 may include a receiver module 610, a wireless communication management module 620, and a transmitter module 630. Each of these components may communicate with each other.

[0122] The components of device 605 may be implemented individually or collectively using one or more application specific integrated circuits (ASICs) adapted to perform some or all of the functions applicable in hardware. Alternatively, the functions may be performed by one or more other processing units (or cores) on one or more integrated circuits. In other embodiments, other types of integrated circuits (e.g., structured / platform ASICs, field programmable gate arrays (FPGAs), and other semi-custom ICs) that may be programmed in any manner known in the art may be used. The functions of each unit may also be implemented in whole or in part using instructions contained in a memory formatted to be executed by one or more general or dedicated processors.

[0123] The receiver module 610 may include any number of receivers. In some cases, the receiver module 610 may include a cellular receiver. The cellular receiver may be an LTE / LTE-A receiver in some cases. The cellular receiver may be used to receive various types of data or control signals (collectively referred to as transmissions). The cellular receiver may be transmitted via a wireless communication system (e.g., reference Figure 1 Receiver module 610 may include an alternative or additional type of receiver, such as an Ethernet or WLAN receiver. The Ethernet or WLAN receiver may also be used to receive various types of data or control signals and may also receive transmissions via one or more communication channels of a wireless communication system (e.g., wireless communication system 100 or 200).

[0124] The transmitter module 630 may include any number of transmitters. In some cases, the transmitter module 630 may include a cellular transmitter. The cellular transmitter may be an LTE / LTE-A transmitter in some cases. The cellular transmitter may be used to send various types of data or control signals (collectively referred to as transmissions). The transmission may be sent via one or more communication channels of a wireless communication system (e.g., wireless communication system 100 or 200). In some cases, the transmitter 630 may include an alternative or additional type of transmitter (e.g., an Ethernet or WLAN transmitter). The Ethernet or WLAN transmitter may also be used to send various types of data or control signals, and may also be sent via one or more communication channels of a wireless communication system (e.g., wireless communication system 100 or 200).

[0125] The wireless communication management module 620 may perform various functions. In an embodiment where the device 605 may be configured as a device 605 of a UE 115, the wireless communication management module 620 may be used to manage multi-connection communications with the first eNB 105 and at least the second eNB 135. The wireless communication management module 620 may also be used to manage allocation of uplink transmit power between the first eNB 105 and at least the second eNB 135.

[0126] In an embodiment where the device 605 may be configured as a device 605 of a first eNB 105, the wireless communication management module 620 may be used to manage multi-connection communications of the UE 115 communicating with the device 605 and at least the second eNB 135. The wireless communication management module 620 may also be used to allocate uplink transmit power between the device 605 and at least the second eNB 135.

[0127] In an embodiment where the device 605 may be configured as a device 605 of a second eNB 135, the wireless communication management module 620 may be used to manage multi-connection communications of the UE 115 communicating with the first eNB 105, the device 605, and possibly one or more other second eNBs 135. The wireless communication management module 620 may also be used to facilitate allocation of uplink transmit power between the first eNB 105, the device 605, and possibly one or more other second eNBs 135.

[0128] Reference now Figure 7 , block diagram 700 illustrates an example of a device 605-a that can be used for wireless communication according to various aspects of the present disclosure. The device 605-a can be as described in reference Figure 1 , 2 , 3, 4, 5 or 6 described UE 115 or one of the devices 605 configured as a UE. The device 605-a may also be a processor. The device 605-a may include a receiver module 610, a wireless communication management module 620-a, or a transmitter module 630. Each of these components may communicate with each other.

[0129] The components of device 605-a may be implemented individually or collectively using one or more ASICs adapted to perform some or all of the functions applicable in hardware. Alternatively, the functions may be performed by one or more other processing units (or cores) on one or more integrated circuits. In other embodiments, other types of integrated circuits (e.g., structured / platform ASICs, FPGAs, and other semi-custom ICs) that may be programmed in any manner known in the art may be used. The functions of each unit may also be implemented in whole or in part using instructions contained in a memory formatted to be executed by one or more general or special purpose processors.

[0130] The receiver module 610 may be configured similarly to the reference Figure 6 Similarly, the transmitter module 630 may be configured similarly to the receiver module 610 described in reference Figure 6 The transmitter module 630 is described.

[0131] The wireless communication management module 620-a may be a reference Figure 6 An example of the wireless communication management module 620 is described, and may include an eNB connection management module 705, an uplink transmission power management module 710, and an uplink communication management module 715.

[0132] The eNB connection management module 705 may be used to establish a connection with the first eNB and the second eNB. Each of the first eNB and the second eNB may provide the UE with radio resources for respective uplink communications. Each of the first eNB and the second eNB may also provide the UE 115-b with radio resources for respective downlink communications. In some cases, the first eNB may be a wireless UE such as the one described in the reference Figure 1 , 2 , 3, 4, 5 or 6 described in one or more aspects of the first eNB 105 or the device 605 configured as the first eNB. In some cases, the second eNB can be as described in reference Figure 1 , 2 , 3, 4, 5, or 6. In some cases, the first eNB may include a master eNB and the second eNB may include a secondary eNB.

[0133] The uplink transmit power management module 710 may be used to receive, at the device 605-a, from a first eNB an indication including an allocation of uplink transmit power between the first eNB and at least a second eNB.The uplink transmit power may be a maximum uplink transmit power in some cases.

[0134] When the first eNB or the second eNB operates in TDD mode, the indication including the allocation of uplink transmit power between the first eNB and at least the second eNB can be based at least in part on the UL / DL configuration of the first eNB or the second eNB. For example, when the eNB operates in TDD mode, the number of active uplink carriers can change over time based on the TDD configuration of each cell within the eNB. When the number of active uplink carriers used by the eNB is small during a particular time period, more of the total uplink transmit power available to the UE during the time period can be allocated to another eNB with which the UE can communicate during the time period. Conversely, when the number of active uplink carriers used by the eNB is large during a particular time period, more of the total uplink transmit power available to the UE during the time period can be allocated to the eNB.

[0135] In some examples, the indication of the allocation of uplink transmit power between the first eNB and at least the second eNB may include an indication of a subframe in which substantially all transmit power may be allocated to the first eNB or the second eNB. For example, substantially all uplink transmit power may be allocated to one or more other eNBs during a subframe or time period in which uplink communications to the eNB are not expected.

[0136] In some cases, the indication may include a time index. The time index may be used to indicate a subframe or time period during which the eNB is allocated a specific uplink transmit power, and may be used to allocate different uplink transmit powers to different eNBs within a subframe or time period.

[0137] In some examples, the uplink transmit power management module 710 may determine the allocation of uplink transmit power between multiple cells of the first eNB or the second eNB based on the indication including the allocation of uplink transmit power between the first eNB and at least the second eNB. The allocation of uplink transmit power between the multiple cells may be semi-statically specified in the indication in some cases (e.g., the first eNB may specify or configure an uplink transmit power value for each cell, which may be used by the UE until the UE receives an adjusted indication including the allocation of uplink transmit power between the first eNB and at least the second eNB from the first eNB). The allocation of uplink transmit power between the multiple cells may be semi-statically specified in the indication according to the time index in other cases (e.g., the first eNB may specify or configure multiple uplink transmit power values ​​for each cell for each time index, which may be used by the UE until the UE receives an adjusted indication including the allocation of uplink transmit power between the first eNB and at least the second eNB from the first eNB).

[0138] In some examples, the indication including the allocation of uplink transmit power between the first eNB and at least the second eNB may include an allocation of total transmit power or a percentage of transmit power between communications with the first eNB and the second eNB. In these embodiments, the uplink transmit power management module 710 may determine the uplink transmit power of each of the plurality of cells controlled by the first eNB or the second eNB based on the indication including the allocation of uplink transmit power between the first eNB and at least the second eNB. In some cases, the uplink transmit power per cell (e.g., the maximum uplink transmit power per cell) may be dynamically adjusted by the uplink transmit power management module 710.

[0139] The uplink communications management module 715 may be used to send uplink communications from the device 605 - a to the first eNB and the second eNB based on an indication including an allocation of uplink transmit power between the first eNB and at least the second eNB.

[0140] Reference now Figure 8, block diagram 800 illustrates an example of a device 605-b that can be used for wireless communication according to various aspects of the present disclosure. The device 605-b can be as described in reference Figure 1 , 2 , 3, 4, 5, 6 or 7 described UE 115 or one of the devices 605 configured as a UE. The device 605-b can also be a processor. The device 605-b may include a receiver module 610, a wireless communication management module 620-b and a transmitter module 630. Each of these components can communicate with each other.

[0141] The components of device 605-b may be implemented, individually or collectively, using one or more ASICs adapted to perform some or all of the functions applicable in hardware. Alternatively, the functions may be performed by one or more other processing units (or cores) on one or more integrated circuits. In other embodiments, other types of integrated circuits (e.g., structured / platform ASICs, FPGAs, and other semi-custom ICs) that may be programmed by any means known in the art may be used. The functions of each unit may also be implemented, in whole or in part, using instructions contained in a memory formatted to be executed by one or more general or special purpose processors.

[0142] The receiver module 610 can be configured to communicate with the reference Figure 6 The transmitter module 630 may be configured similarly to the receiver module 610 described in the reference. Figure 6 The transmitter module 630 is described similarly.

[0143] The wireless communication management module 620-b may be a reference Figure 6 Or an example of the wireless communication management module 620 described in 7, and may include an eNB connection management module 705-a, an uplink transmission power management module 710-a, an uplink communication management module 715-a, a power headroom report generation module 805, a power headroom report transmission module 810 and an uplink transmission power modification module 815.

[0144] The eNB connection management module 705-a may be used to establish a connection with the first eNB and the second eNB. Each of the first eNB and the second eNB may provide the UE with radio resources for respective uplink communications. Each of the first eNB and the second eNB may also provide the UE 115-b with radio resources for respective downlink communications. In some cases, the first eNB may be a wireless communication module such as the one described in the reference Figure 1 , 2, 3, 4, 5 or 6 described in one or more aspects of the first eNB 105 or the device 605 configured as the first eNB. In some cases, the second eNB can be as described in reference Figure 1 , 2 , 3, 4, 5, or 6. In some cases, the first eNB may include a master eNB and the second eNB may include a secondary eNB.

[0145] The uplink transmit power management module 710-a may be used to receive, at the device 605-b, from a first eNB an indication including an allocation of uplink transmit power between the first eNB and at least a second eNB.The uplink transmit power may be a maximum uplink transmit power in some cases.

[0146] In certain embodiments, for example, when the first eNB or the second eNB operates in TDD mode, the indication including the allocation of uplink transmit power between the first eNB and at least the second eNB may be based at least in part on the UL / DL configuration of the first eNB or the second eNB. For example, when the eNB operates in TDD mode, the number of active uplink carriers may change over time based on the TDD configuration of each cell within the eNB. When the number of active uplink carriers used by the eNB is less during a particular time period, more of the total uplink transmit power available to the UE during the time period may be allocated to another eNB with which the UE may communicate during the time period. Conversely, when the number of active uplink carriers used by the eNB is greater during a particular time period, more of the total uplink transmit power available to the UE during the time period may be allocated to the eNB.

[0147] In some examples, the indication of the allocation of uplink transmit power between the first eNB and at least the second eNB may include an indication of a subframe in which substantially all transmit power may be allocated to the first eNB or the second eNB. For example, substantially all uplink transmit power may be allocated to one or more other eNBs during a subframe or time period in which uplink communications to the eNB are not expected.

[0148] In some cases, the indication may include a time index. The time index may be used to indicate a subframe or time period during which the eNB is allocated a specific uplink transmit power, and may be used to allocate different uplink transmit powers to different eNBs within a subframe or time period.

[0149] In some embodiments, the uplink transmit power management module 710-a can determine the allocation of uplink transmit power between multiple cells of the first eNB or the second eNB based on an indication including the allocation of uplink transmit power between the first eNB and at least the second eNB. The allocation of uplink transmit power between multiple cells can be semi-statically specified in the indication in some cases (for example, the first eNB can specify or configure an uplink transmit power value for each cell, which can be used by the UE until the UE receives an adjusted indication including the allocation of uplink transmit power between the first eNB and at least the second eNB from the first eNB). The allocation of uplink transmit power between multiple cells can be semi-statically specified in the indication according to a time index in other cases (for example, the first eNB can specify or configure multiple uplink transmit power values ​​for each cell for each time index, which can be used by the UE until the UE receives an adjusted indication including the allocation of uplink transmit power between the first eNB and at least the second eNB from the first eNB).

[0150] In some embodiments, the indication including the allocation of uplink transmit power between the first eNB and at least the second eNB may include an allocation of total transmit power or a percentage of total transmit power between communications with the first eNB and the second eNB. In these embodiments, the uplink transmit power management module 710-a may determine the uplink transmit power of each of a plurality of cells controlled by the first eNB or the second eNB based on the indication including the allocation of uplink transmit power between the first eNB and at least the second eNB. In some cases, the uplink transmit power per cell (e.g., the maximum uplink transmit power per cell) may be dynamically adjusted by the uplink transmit power management module 710-a.

[0151] The uplink communications management module 715 - a may be used to send uplink communications from the device 605 - b to the first eNB and the second eNB based on an indication including an allocation of uplink transmit power between the first eNB and at least the second eNB.

[0152] The power headroom report generation module 805 may be used to trigger a power headroom report at the device 605-b. In some embodiments, the power headroom report generation module 805 may trigger a power headroom report for an eNB (e.g., a first eNB or a second eNB) based on a condition of the eNB or a neighboring eNB (e.g., an eNB other than the eNB for which the power headroom report is triggered). As an example, the condition of the eNB or the neighboring eNB may be a determination that an uplink transmit power of the device 605-b for the eNB or the neighboring eNB has crossed a threshold. In some cases, the threshold may include a maximum uplink power for the eNB. As a further example, the condition of the eNB or the neighboring eNB may be a measured path loss of the eNB or the neighboring eNB (e.g., a path loss change that satisfies a threshold). As yet a further example, the condition of the eNB or the neighboring eNB may be a determination that the eNB or the neighboring eNB has activated an uplink cell.

[0153] The power headroom report generation module 805 may also be used to generate a power headroom report at the device 605-b. The power headroom report may include power headroom information for both the first eNB and the second eNB. Including power headroom information for both the first eNB and the second eNB may reduce power headroom reporting overhead and enable the eNB to estimate the total uplink transmit power used by the device 605-b. In some examples, the power headroom information may be calculated using Equation 1.

[0154] The power headroom report transmission module 810 may be used to send a power headroom report to a first eNB or a second eNB. In some embodiments, the power headroom report may be automatically sent to the eNB for which the power headroom report is triggered. In other embodiments, the power headroom report may be sent to the eNB for which the power headroom report is triggered in response to a trigger message received from the eNB. In the latter embodiment, and as an example, a power headroom report triggered for a first eNB may be sent to the first eNB in ​​response to a trigger message received from the first eNB.

[0155] In some cases, the power headroom report transmission module 810 may transmit the power headroom report to the eNB for which the power headroom report is triggered (e.g., the power headroom report triggered for the first eNB may be transmitted to the first eNB). In other cases, the power headroom report transmission module 810 may transmit the power headroom report to the eNB for which the power headroom report is triggered and to the neighboring eNBs (e.g., the power headroom report triggered for the first eNB may be transmitted to the first eNB and the second eNB). In the latter case, the power headroom report transmission module 810 may, in some cases, transmit the power headroom report to the neighboring eNB based on a determination that uplink resources are allocated to the UE for uplink transmission to the neighboring eNB.

[0156] After the power headroom report transmission module 810 sends the power headroom report to the eNB, the uplink transmit power management module 710-a can be used to receive a second indication including an allocation of uplink transmit power from the first eNB. The second indication including the allocation of uplink transmit power can change the uplink transmit power allocated to the first eNB or the second eNB. After receiving the second indication including the allocation of uplink transmit power, the power headroom report generation module 805 can be used to determine the power headroom of the first eNB and the second eNB with respect to the uplink transmit power allocated to the first eNB or the second eNB in ​​the second indication.

[0157] The uplink transmit power modification module 815 can be used to modify the allocation of total uplink transmit power between the first eNB and the second eNB (or the allocation of uplink transmit power between cells) when it is possible and useful to send uplink communications from the UE to the first eNB or the second eNB. In some cases, the uplink transmit power modification module 815 can modify the allocation of uplink transmit power by borrowing uplink transmit power allocated to one eNB or cell and reallocating the borrowed uplink transmit power to another eNB or cell. The modification of the allocation of uplink transmit power can in some cases be based on the priority of uplink data or control information of one of the eNBs (e.g., the first eNB or the second eNB) with respect to other eNBs in the eNB. The modification can also or alternatively be based on the priority of uplink data or control information of the cell. The modification can also or alternatively be based on the uplink not being used by the eNB or cell.

[0158] Following modification of the allocation of uplink transmit power between the first eNB and the second eNB, a power headroom report may be generated using a power headroom report generation module 805. The power headroom report may include power headroom information for both the first eNB and the second eNB. Including power headroom information for both the first eNB and the second eNB may reduce power headroom reporting overhead and enable the eNB to estimate the total uplink transmit power used by the device 605-b. In some examples, the power headroom information may be calculated using Equation 1.

[0159] A power headroom report triggered by a modification of the allocation of uplink transmit power between the first eNB and the second eNB may be sent to the first eNB or the second eNB. In some cases, the power headroom report transmission module 810 may send a power headroom report to an eNB that receives power during the modification of the allocation of uplink transmit power. Such a power headroom report may include negative power headroom information. In other cases, the power headroom report transmission module 810 may send a power headroom report to an eNB from which power is borrowed during the modification of the allocation of uplink transmit power. The latter power headroom report may subtract the borrowed power from the configured maximum power of the eNB or cell. In the case of power headroom information according to the cell, Equation 2 may be used to calculate the power headroom information.

[0160] Reference now Fig. 9 , block diagram 900 illustrates an example of a device 605-c that can be used for wireless communication according to various aspects of the present disclosure. The device 605-c can be as described in reference Figure 1 , 2 , 3, 4, 5 or 6, or one or more aspects of one of the first eNB 105 or the device 605 configured as the first eNB. The device 605-c may also be a processor. The device 605-c may include a receiver module 610, a wireless communication management module 620-c, and a transmitter module 630. Each of these components may communicate with each other.

[0161] The components of device 605-c may be implemented individually or collectively using one or more ASICs adapted to perform some or all of the functions applicable in hardware. Alternatively, the functions may be performed by one or more other processing units (or cores) on one or more integrated circuits. In other embodiments, other types of integrated circuits (e.g., structured / platform ASICs, FPGAs, and other semi-custom ICs) that may be programmed in any manner known in the art may be used. The functions of each unit may also be implemented in whole or in part using instructions contained in a memory formatted to be executed by one or more general or dedicated processors.

[0162] The receiver module 610 can be configured to communicate with the reference Figure 6 The transmitter module 630 may be configured similarly to the receiver module 610 described in the reference. Figure 6 The transmitter module 630 is described similarly.

[0163] The wireless communication management module 620-c may be a reference Figure 6 An example of the wireless communication management module 620 is described, and may include a UE multiple connection management module 905, an uplink transmission power determination module 910 and an uplink transmission power communication module 915.

[0164] The UE multiple connection management module 905 may be configured to coordinate multiple connection communications for the UE with at least the device 605-c and the second eNB. Figure 1 , 2 , 3, 4, 5, 6, 7 or 8 described in one or more aspects of the UE 115 or the device 605 configured as a UE. In some cases, the second eNB can be as described in reference Figure 1 , 2 , 3, 4, 5, or 6, or one or more aspects of one of the second eNBs 135 or the device 605 configured as the second eNB. In some cases, the device 605-c may include a master eNB and the second eNB may include a secondary eNB.

[0165] The uplink transmit power determination module 910 may be used to determine an allocation of uplink transmit power for the UE between the device 605-c and at least a second eNB. The uplink transmit power may be a maximum uplink transmit power in some cases.

[0166] In some examples, the uplink transmit power determination module 910 can determine the allocation of uplink transmit power among multiple cells of the device 605-c based on an indication including the allocation of uplink transmit power between the device 605-c and at least a second eNB. The allocation of uplink transmit power among multiple cells can in some cases be semi-statically specified in the indication (e.g., the device 605-c can specify or configure an uplink transmit power value for each cell, which can be used by the UE until the UE receives an adjusted indication from the device 605-c including the allocation of uplink transmit power between the device 605-c and at least a second eNB). The allocation of uplink transmit power among multiple cells may in other cases be semi-statically specified in the indication according to a time index (e.g., device 605-c may specify or configure multiple uplink transmit power values ​​for each cell for each time index, which may be used by the UE until the UE receives an adjusted indication from device 605-c including the allocation of uplink transmit power between device 605-c and at least a second eNB).

[0167] The uplink transmit power communication module 915 may be configured to send an indication of an allocation including an uplink transmit power allocation to a UE.

[0168] In some examples, such as when the device 605-c or the second eNB operates in TDD mode, the indication including the allocation of uplink transmit power between the device 605-c and at least the second eNB can be based at least in part on the UL / DL configuration of the device 605-c or the second eNB. For example, when the eNB operates in TDD mode, the number of active uplink carriers can change over time based on the TDD configuration of each cell within the eNB. When the number of active uplink carriers used by the eNB is small during a particular time period, more of the total uplink transmit power available to the UE during the time period can be allocated to another eNB with which the UE can communicate during the time period. Conversely, when the number of active uplink carriers used by the eNB is large during a particular time period, more of the total uplink transmit power available to the UE during the time period can be allocated to the eNB.

[0169] In some embodiments, the indication of the allocation of uplink transmit power between the device 605-c and at least the second eNB may include an indication of a subframe over which substantially all of the transmit power may be allocated to the device 605-c or the second eNB. For example, substantially all of the uplink transmit power may be allocated to one or more other eNBs during a subframe or time period in which uplink communications to the eNB are not expected.

[0170] In some cases, the indication may include a time index. The time index may be used to indicate a subframe or time period during which the eNB is allocated a specific uplink transmit power, and may be used to allocate different uplink transmit powers to different eNBs within a subframe or time period.

[0171] Reference now Fig.10 , block diagram 1000 illustrates an example of a device 605-d that can be used for wireless communication according to various aspects of the present disclosure. The device 605-d can be as described in reference Figure 1 , 2 , 3, 4, 5 or 6, or one or more aspects of one of the first eNB 105 or the device 605 configured as the first eNB. The device 605-d may also be a processor. The device 605-d may include a receiver module 610, a wireless communication management module 620-d, and a transmitter module 630. Each of these components may communicate with each other.

[0172] The components of device 605-d may be implemented, individually or collectively, using one or more ASICs adapted to perform some or all of the functions applicable in hardware. Alternatively, the functions may be performed by one or more other processing units (or cores) on one or more integrated circuits. In other embodiments, other types of integrated circuits (e.g., structured / platform ASICs, FPGAs, and other semi-custom ICs) that may be programmed by any means known in the art may be used. The functions of each unit may also be implemented, in whole or in part, using instructions contained in a memory formatted to be executed by one or more general or special purpose processors.

[0173] The receiver module 610 can be configured to communicate with the reference Figure 6 The transmitter module 630 may be configured similarly to the receiver module 610 described in the reference. Figure 6 The transmitter module 630 is described similarly.

[0174] The wireless communication management module 620-d may be a reference Figure 6 An example of a wireless communication management module 620 is described, and may include a UE multiple connection management module 905-a, an uplink transmission power determination module 910-a, an uplink transmission power communication module 915-a and a power headroom report processing module 1005.

[0175] The UE multiple connection management module 905-a can be used to coordinate multiple connection communications with at least device 605-d and a second eNB for the UE. In some cases, the UE can be as shown in FIG. Figure 1 ,2 , 3, 4, 5, 6, 7 or 8 described in one or more aspects of the UE 115 or the device 605 configured as a UE. In some cases, the second eNB can be as described in reference Figure 1 , 2 , 3, 4, 5, or 6, or one or more aspects of one of the second eNBs 135 or the device 605 configured as the second eNB. In some cases, the device 605-d may include a master eNB and the second eNB may include a secondary eNB.

[0176] The uplink transmit power determination module 910-a may be used to determine an allocation of uplink transmit power for the UE between the device 605-d and at least a second eNB. The uplink transmit power may be a maximum uplink transmit power in some cases.

[0177] In some examples, the uplink transmit power determination module 910-a can determine the allocation of uplink transmit power among multiple cells of the device 605-d based on an indication that includes the allocation of uplink transmit power between the device 605-d and at least a second eNB. The allocation of uplink transmit power among multiple cells can in some cases be semi-statically specified in the indication (e.g., the device 605-d can specify or configure an uplink transmit power value for each cell, which can be used by the UE until the UE receives an adjusted indication from the device 605-d that includes the allocation of uplink transmit power between the device 605-d and at least the second eNB). The allocation of uplink transmit power among multiple cells may in other cases be semi-statically specified in the indication according to a time index (e.g., device 605-d may specify or configure multiple uplink transmit power values ​​for each cell for each time index, which uplink transmit power values ​​may be used by the UE until the UE receives an adjusted indication from device 605-d including the allocation of uplink transmit power between device 605-d and at least a second eNB).

[0178] The uplink transmit power communication module 915-a may be used to send an indication of an allocation including an uplink transmit power allocation to a UE.

[0179] In some examples, such as when the device 605-d or the second eNB operates in TDD mode, the indication of the allocation of uplink transmit power between the device 605-d and at least the second eNB can be based at least in part on the UL / DL configuration of the device 605-d or the second eNB. For example, when the eNB operates in TDD mode, the number of active uplink carriers can change over time based on the TDD configuration of each cell within the eNB. When the number of active uplink carriers used by the eNB is small during a particular time period, more of the total uplink transmit power available to the UE during the time period can be allocated to another eNB with which the UE can communicate during the time period. Conversely, when the number of active uplink carriers used by the eNB is large during a particular time period, more of the total uplink transmit power available to the UE during the time period can be allocated to the eNB.

[0180] In some embodiments, the indication of the allocation of uplink transmit power between the device 605-d and at least the second eNB may include an indication of a subframe over which substantially all of the transmit power may be allocated to the device 605-d or the second eNB. For example, substantially all of the uplink transmit power may be allocated to one or more other eNBs during a subframe or time period in which uplink communications to the eNB are not expected.

[0181] In some cases, the indication may include a time index. The time index may be used to indicate a subframe or time period during which the eNB is allocated a specific uplink transmit power, and may be used to allocate different uplink transmit powers to different eNBs within a subframe or time period.

[0182] The power headroom report processing module 1005 may be configured to receive a power headroom report including power headroom information of at least the device 605-d and the second eNB. Figure 8 As described above, the power headroom report generation module 805 may receive the power headroom report in response to at least one of: an uplink transmit power of the UE to the second eNB; a measured change in the path loss of the second eNB; or an activation of an uplink cell by the second eNB. In some cases, the power headroom report may be received in response to the device 605-d sending a trigger message (e.g., a request for a power headroom report) to the UE.

[0183] The power headroom report processing module 1005 may optionally send a power headroom report to the second eNB.

[0184] In some embodiments, the power headroom report may indicate that the UE has modified the allocation of uplink transmit power between the device 605-d and the second eNB, and the power headroom report processing module 1005 may be used to determine that the UE has modified the allocation of uplink transmit power between the device 605-d and the second eNB based on the power headroom report. In other embodiments, the power headroom report may not indicate that the UE has modified the allocation of uplink transmit power between the device 605-d and the second eNB.

[0185] In some cases, the UL transmit power determination module 910-a can be used to adjust the allocation of uplink transmit power for the UE between the device 605-d and the second eNB based on the power headroom report. In some cases, the adjustment can be based on a modification made by the UE to the allocation of uplink transmit power between the first eNB and the second eNB. In some cases, the UL transmit power communication module 915-a can be used to send the adjusted allocation of uplink transmit power to at least one of the UE or the second eNB.

[0186] In certain embodiments of the device 605-d, the adjustment of the allocation of uplink transmit power for the UE between the device 605-d and the second eNB may also or alternatively be made based on a message received at the device 605-d from the second eNB. The message may include a power headroom report of the UE or information generated by the second eNB.

[0187] In certain embodiments of the device 605-d, the wireless communication management module 620-d may schedule communications (eg, downlink or uplink communications) with the UE. Communications between the UE and the device 605-d may be scheduled independently of communications between the UE and the second eNB.

[0188] Fig.11 A block diagram 1100 of a UE 115-e configured for wireless communication according to various aspects of the present disclosure is shown. The UE 115-e can have various configurations and can be included or part of a personal computer (e.g., a laptop computer, a notebook computer, a tablet computer, etc.), a cellular phone, a PDA, a digital video camera (DVR), an Internet device, a game console, an e-reader, etc. The UE 115-e can in some cases have an internal power source (not shown) such as a small battery to facilitate mobile operation. In some embodiments, the UE 115-e can be as described in reference Figure 1 , 2 , 3, 4, 5, 6, 7, or 8, or one of the UE 115 or a device 605 configured as a UE. The UE 115-e may be configured to implement the reference Figure 1 , 2 , 3, 4, 5, 6, 7 or 8. The UE 115-e may be configured to communicate with the reference Figure 1 , 2 , 3, 4, 5, 6, 9 or 10 describes a first eNB 105 or one of the devices 605 configured as a first eNB, or communicates with a second eNB 135 or one or more of the devices 605 configured as a second eNB.

[0189] UE 115-e may include a processor module 1110, a memory 1120, at least one transceiver module (represented by transceiver module 1130), at least one antenna (represented by antenna 1140), and a wireless communication management module 620-e. Each of these components may communicate with each other directly or indirectly via one or more buses 1135.

[0190] The memory 1120 may include random access memory (RAM) or read-only memory (ROM). The memory 1120 may store computer-readable, computer-executable code 1125 containing instructions that, when executed, are configured to cause the processor module 1110 to perform various functions described herein for managing wireless communications. Alternatively, the code 1125 may not be directly executable by the processor module 1110, but may be configured to cause the UE 115-e (e.g., when compiled and executed) to implement various UE features and functions described herein.

[0191] The processor module 1110 may include an intelligent hardware device such as a CPU, a microcontroller, an ASIC, etc. The processor module 1110 may process information received by the transceiver module 1130 or information to be sent to the transceiver module 1130 for transmission via the antenna 1140. The processor module 1110 may also handle various aspects of managing uplink transmit power for communication with the first eNB and the second eNB, either independently or in conjunction with the wireless communication management module 620-e.

[0192] The transceiver module 1130 may include a modem configured to modulate packets and provide the modulated packets to the antenna 1140 for transmission, and to demodulate packets received from the antenna 1140. The transceiver module 1130 may be implemented as one or more transmitter modules and one or more separate receiver modules in some cases. The transceiver module 1130 may be configured to communicate bidirectionally with one or more eNBs 105 or 135 or other UEs 115 via the antenna 1140. Although the UE 115-e may include a single antenna, there may also be embodiments in which the UE 115-e may include multiple antennas 1140.

[0193] The wireless communication management module 620-e may be a reference Figure 6 , 7 or 8 described in one or more aspects of the wireless communication management module 620, and can be configured to execute or control reference Figure 3 , 4 , some or all of the wireless communication management functions described in 5, 6, 7 or 8.

[0194] according to Fig.11 In the architecture of the UE 115-e, the UE 115-e may also include a state module 1150. The state module 1150 may reflect and control the current device state (e.g., context, authentication, base station association, or other connection issues).

[0195] As an example, each of the wireless communication management module 620-e or the state module 1150, or portions of one or both modules, may be a component of the UE 115-e that communicates with some or all of the other components of the UE 115-e via one or more buses 1135. Alternatively, a processor may be used to implement the functionality of the wireless communication management module 620-e or the state module 1150, or some or all of the functionality of the wireless communication management module 620-e or the state module 1150 may be implemented by the code 1125 or the processor module 1110 or in combination with the processor module 1110.

[0196] The components of UE 115-e may be implemented individually or collectively using one or more ASICs adapted to perform some or all of the functions applicable in hardware. Alternatively, the functions may be performed by one or more other processing units (or cores) on one or more integrated circuits. In other embodiments, other types of integrated circuits (e.g., structured / platform ASICs, FPGAs, and other semi-custom ICs) that can be programmed in any manner known in the art may be used. The functions of each unit may also be implemented in whole or in part using instructions contained in a memory formatted to be executed by one or more general or dedicated processors. Each of the modules indicated may be a unit for performing one or more functions related to the operation of UE 115-e.

[0197] Fig.12 A block diagram 1200 illustrating an eNB 105-e configured for wireless communication according to various aspects of the present disclosure is shown. In some embodiments, the eNB 105-e may be as described in reference Figure 1 , 2 , 3, 4, 5, 6, 9, or 10, or one or more aspects of one of the first eNB 105 or the device 605 configured as the first eNB, or an example of aspects of a second eNB in ​​the second eNB 135. The eNB 105-e may be configured to implement reference Figure 1 , 2 , 3, 4, 5, 6, 9 or 10. The eNB 105-e may be configured to be compatible with the first eNB or the second eNB as described in reference Figure 1 , 2 , 3, 4, 5, 6, 7 or 8 described in the UE 115 or a device 605 configured as a UE. The eNB 105-e can also be configured to communicate with the reference Figure 2 , 3 , 4, 5, 6, 7, 8, 9, 10 or 11 described first eNB or second eNB 135 communication.

[0198] The eNB 105-e may include a processor module 1210, a memory 1220, at least one transceiver module (represented by transceiver module 1230), at least one antenna (represented by antenna 1240), and a wireless communication management module 620-f. The eNB 105-e may also include one or more of an eNB communication module 1250 and a network communication module 1260. Each of these components may communicate with each other directly or indirectly via one or more buses 1235.

[0199] The memory 1220 may include RAM or ROM. The memory 1220 may store computer-readable, computer-executable code 1225 containing instructions that, when executed, are configured to cause the processor module 1210 to perform various functions described herein for managing wireless communications. Alternatively, the code 1225 may not be directly executable by the processor module 1210, but may be configured to cause the eNB 105-e (e.g., when compiled and executed) to perform various eNB features and functions described herein.

[0200] The processor module 1210 may include an intelligent hardware device such as a CPU, a microcontroller, an ASIC, etc. The processor module 1210 may process information received through the transceiver module 1230, the eNB communication module 1250, or the network communication module 1260. The processor module 1210 may also process information to be sent to the transceiver module 1230 for transmission through the antenna 1240, to be sent to the eNB communication module 1250 for transmission to one or more other eNBs 105-f and 105-g, or to be sent to the network communication module 1260 for transmission to the core network 130-a, which may be a reference Figure 1 The processor module 1210 may independently or in conjunction with the wireless communication management module 620-f handle various aspects of managing uplink transmit power of one or more UEs communicating with the eNB 105-e and at least one other eNB.

[0201] The transceiver module 1230 may include a modem configured to modulate packets and provide the modulated packets to the antenna 1240 for transmission, and to demodulate packets received from the antenna 1240. The transceiver module 1230 may be implemented as one or more transmitter modules and one or more separate receiver modules in some cases. The transceiver module 1240 may be configured to communicate bidirectionally with one or more UEs 115 via the antenna 1240. The eNB 105-e may typically include multiple antennas 1240 (e.g., an antenna array). The eNB 105-e may communicate with the core network 130-a via a network communication module 1260. The eNB 105-e may also communicate with other eNBs (e.g., eNBs 105-f and 105-g) using an eNB communication module 1250.

[0202] The wireless communication management module 620-f may be a reference Figure 6 , 9 or 10 described in one or more aspects of the wireless communication management module 620, and can be configured to execute or control reference Figure 3 , 4 , 5, 6, 9 or 10. As an example, the wireless communication management module 620-f or a portion thereof may be a component of the eNB 105-e that communicates with some or all of the other components of the eNB 105-e via one or more buses 1235. Alternatively, the functions of the wireless communication management module 620-f may be implemented using a processor, or some or all of the functions of the wireless communication management module 620-f may be implemented by the code 1225 or the processor module 1210 or in combination with the processor module 1210.

[0203] The components of the eNB 105-e may be implemented individually or collectively using one or more ASICs adapted to perform some or all of the functions applicable in hardware. Alternatively, the functions may be performed by one or more other processing units (or cores) on one or more integrated circuits. In other embodiments, other types of integrated circuits (e.g., structured / platform ASICs, FPGAs, and other semi-custom ICs) that can be programmed in any manner known in the art may be used. The functions of each unit may also be implemented in whole or in part using instructions contained in a memory formatted to be executed by one or more general or dedicated processors. Each of the modules indicated may be a unit for performing one or more functions related to the operation of the eNB 105-e. In some cases, components of the ENB 105-e may be replicated or distributed between more than one base station.

[0204] Fig.13 1 is a flow chart illustrating a method 1300 for wireless communication by a UE according to various aspects of the present disclosure. Figure 1 , 2 , 3, 4, 5, 6, 7, 8 or 1 described in the UE 115 or the device 605 configured as a UE, as shown in reference Figure 1 , 2 , 3, 4, 5, 6, 9, 10 or 12 described in the first eNB 105 or the device 605 configured as the first eNB, or as described in reference Figure 1 , 2 , 3, 4, 5, 6, or 12, or one of the second eNBs 135 or the device 605 configured as the second eNB. In one implementation, reference is made to Figure 6 , 7, 8 or 11 described in the wireless communication management module 620 can execute one or more code sets for controlling the functional units of the UE 115 or the device 605 configured as a UE to perform the functions described below.

[0205] At block 1305, connections may be established with a first eNB and a second eNB, wherein each of the first eNB and the second eNB may provide radio resources for respective uplink communications to the UE. Each of the first eNB and the second eNB may also provide radio resources for respective downlink communications to the UE 115-b. In some cases, the first eNB may include a master eNB and the second eNB may include a secondary eNB. Reference may be used Figure 6 , 7 , 8 or 11 described wireless communication management module 620 or reference Figure 7 The operation at block 1305 may be performed or managed by the eNB connection management module 705 described in or 8 .

[0206] At block 1310, an indication of an allocation of uplink transmit power between the first eNB and at least a second eNB may be received from a first eNB. The indication of the allocation of uplink transmit power may, in some cases, include an indication of a maximum uplink transmit power allocated to each of the first eNB and at least the second eNB. Reference may be used Figure 6 , 7 , 8 or 11 described wireless communication management module 620 or reference Figure 7 The uplink transmission power management module 710 described in or 8 performs or manages the operations at box 1310.

[0207] In certain embodiments, such as when the first eNB or the second eNB operates in TDD mode, the indication including the allocation of uplink transmit power between the first eNB and at least the second eNB can be based at least in part on the UL / DL configuration of the first eNB or the second eNB. For example, when the eNB operates in TDD mode, the number of active uplink carriers can change over time based on the TDD configuration of each cell within the eNB. When the number of active uplink carriers used by the eNB is less during a particular time period, more of the total uplink transmit power available to the UE during the time period can be allocated to another eNB with which the UE can communicate during the time period. Conversely, when the number of active uplink carriers used by the eNB is greater during a particular time period, more of the total uplink transmit power available to the UE during the time period can be allocated to the eNB.

[0208] In some embodiments, the indication including the allocation of uplink transmit power between the first eNB and at least the second eNB may include an indication of a subframe over which substantially all transmit power may be allocated to the first eNB or the second eNB. For example, substantially all uplink transmit power may be allocated to one or more other eNBs during a subframe or time period in which uplink communications to the eNB are not expected.

[0209] In some cases, the indication may include a time index. The time index may be used to indicate a subframe or time period during which the eNB is allocated a specific uplink transmit power, and may be used to allocate different uplink transmit powers to different eNBs within a subframe or time period.

[0210] In some embodiments, the UE may determine the allocation of uplink transmit power between multiple cells of the first eNB or the second eNB based on an indication including the allocation of uplink transmit power between the first eNB and at least the second eNB. The allocation of uplink transmit power between the multiple cells may be semi-statically specified in the indication in some cases (e.g., the first eNB may specify or configure an uplink transmit power value for each cell, which may be used by the UE until the UE receives an adjusted indication from the first eNB including the allocation of uplink transmit power between the first eNB and at least the second eNB). The allocation of uplink transmit power between the multiple cells may be semi-statically specified in the indication according to a time index in other cases (e.g., the first eNB may specify or configure multiple uplink transmit power values ​​for each cell for each time index, which may be used by the UE until the UE receives an adjusted indication from the first eNB including the allocation of uplink transmit power between the first eNB and at least the second eNB).

[0211] In some embodiments, the indication including the allocation of uplink transmit power between the first eNB and at least the second eNB may include an allocation of the total transmit power between communications with the first eNB and the second eNB. In these embodiments, the UE may determine, at the UE, an uplink transmit power for each of a plurality of cells controlled by the first eNB or the second eNB based on the indication including the allocation of uplink transmit power between the first eNB and at least the second eNB. In some cases, the uplink transmit power per cell (e.g., the maximum uplink transmit power per cell) may be dynamically adjusted at the UE.

[0212] At block 1315, uplink communications may be sent from the UE to the first eNB and the second eNB based on an indication including an allocation of uplink transmit power between the first eNB and at least the second eNB. Figure 6 , 7 , 8 or 11 described wireless communication management module 620 or reference Figure 7 The uplink communication management module 715 described in or 8 performs or manages the operations at box 1315.

[0213] Thus, method 1300 may be used for wireless communications.It should be noted that method 1300 is only one implementation, and the operations of method 1300 may be rearranged or otherwise modified such that other implementations are possible.

[0214] Fig.14 1 is a flow chart illustrating a method 1400 for wireless communication by a UE according to various aspects of the present disclosure. Figure 1 , 2 , 3, 4, 5, 6, 7, 8 or 1 described in the UE 115 or the device 605 configured as a UE, as shown in reference Figure 1 , 2 , 3, 4, 5, 6, 9, 10 or 12 described in the first eNB 105 or the device 605 configured as the first eNB, or as described in reference Figure 1 , 2 , 3, 4, 5, 6, or 12, or one of the second eNBs 135 or the device 605 configured as the second eNB. In one implementation, the method 1400 is described with reference to Figure 6 , 7 , 8 or 11 described in the wireless communication management module 620 can execute one or more code sets for controlling the functional units of the UE 115 or the device 605 configured as a UE to perform the functions described below.

[0215] At block 1405, connections may be established with a first eNB and a second eNB, wherein each of the first eNB and the second eNB may provide radio resources for respective uplink communications to the UE. Each of the first eNB and the second eNB may also provide radio resources for respective downlink communications to the UE 115-b. In some cases, the first eNB may include a master eNB and the second eNB may include a secondary eNB. Reference may be used Figure 6 , 7 , 8 or 11 described wireless communication management module 620 or reference Figure 7The eNB connection management module 705 described in or 8 performs or manages the operations at box 1405.

[0216] At block 1410, an indication of an allocation of uplink transmit power between the first eNB and at least a second eNB may be received from the first eNB. The indication of the allocation of uplink transmit power may include, in some cases, an indication of a maximum uplink transmit power or a percentage of uplink transmit power allocated to each of the first eNB and at least the second eNB. Reference may be used Figure 6 , 7 , 8 or 11 described wireless communication management module 620 or reference Figure 7 The uplink transmission power management module 710 described in or 8 performs or manages the operations at box 1410.

[0217] In certain embodiments, such as when the first eNB or the second eNB operates in TDD mode, the indication including the allocation of uplink transmit power between the first eNB and at least the second eNB can be based at least in part on the UL / DL configuration of the first eNB or the second eNB. For example, when the eNB operates in TDD mode, the number of active uplink carriers can change over time based on the TDD configuration of each cell within the eNB. When the number of active uplink carriers used by the eNB is less during a particular time period, more of the total uplink transmit power available to the UE during the time period can be allocated to another eNB with which the UE can communicate during the time period. Conversely, when the number of active uplink carriers used by the eNB is greater during a particular time period, more of the total uplink transmit power available to the UE during the time period can be allocated to the eNB.

[0218] In some embodiments, the indication including the allocation of uplink transmit power between the first eNB and at least the second eNB may include an indication of a subframe over which substantially all transmit power may be allocated to the first eNB or the second eNB. For example, substantially all uplink transmit power may be allocated to one or more other eNBs during a subframe or time period in which uplink communications to the eNB are not expected.

[0219] In some cases, the indication may include a time index. The time index may be used to indicate a subframe or time period during which the eNB is allocated a specific uplink transmit power, and may be used to allocate different uplink transmit powers to different eNBs within a subframe or time period.

[0220] In some embodiments, the UE may determine the allocation of uplink transmit power between multiple cells of the first eNB or the second eNB based on an indication including the allocation of uplink transmit power between the first eNB and at least the second eNB. The allocation of uplink transmit power between the multiple cells may be semi-statically specified in the indication in some cases (e.g., the first eNB may specify or configure an uplink transmit power value for each cell, which may be used by the UE until the UE receives an adjusted indication from the first eNB including the allocation of uplink transmit power between the first eNB and at least the second eNB). The allocation of uplink transmit power between the multiple cells may be semi-statically specified in the indication according to a time index in other cases (e.g., the first eNB may specify or configure multiple uplink transmit power values ​​for each cell for each time index, which may be used by the UE until the UE receives an adjusted indication from the first eNB including the allocation of uplink transmit power between the first eNB and at least the second eNB).

[0221] In some embodiments, the indication including the allocation of uplink transmit power between the first eNB and at least the second eNB may include the allocation of total transmit power between communications with the first eNB and the second eNB. In these embodiments, the UE may determine, at the UE, the uplink transmit power of each of the plurality of cells controlled by the first eNB or the second eNB based on the indication including the allocation of uplink transmit power between the first eNB and at least the second eNB. In some cases, the uplink transmit power per cell (e.g., the maximum uplink transmit power per cell) may be dynamically adjusted at the UE.

[0222] At block 1415, uplink communications may be sent from the UE to the first eNB and the second eNB based on an indication including an allocation of uplink transmit power between the first eNB and at least the second eNB. Figure 6 , 7 , 8 or 11 described wireless communication management module 620 or reference Figure 7 The operations at box 1415 may be performed or managed by the uplink communication management module 715 described in or 8.

[0223] At block 1420, a power headroom report at the UE may be triggered. In certain embodiments, a power headroom report for an eNB (e.g., a first eNB or a second eNB) may be triggered based on a condition of the eNB or a neighboring eNB (e.g., an eNB other than the eNB for which the power headroom report is triggered). As an example, the condition of the eNB or the neighboring eNB may be a determination that an uplink transmit power of a UE for the eNB or the neighboring eNB has crossed a threshold. In some cases, the threshold may include a maximum uplink power of the eNB. As a further example, the condition of the eNB or the neighboring eNB may be a measured path loss of the eNB or the neighboring eNB (e.g., a change in path loss that satisfies a threshold). As yet a further example, the condition of the eNB or the neighboring eNB may be a determination that the eNB or the neighboring eNB has activated an uplink cell.

[0224] At block 1425, a power headroom report may be generated at the UE. The power headroom report may include power headroom information for both the first eNB and the second eNB. Including power headroom information for both the first eNB and the second eNB may reduce power headroom reporting overhead and enable the eNB to estimate the total uplink transmit power used by the UE. In some examples, the power headroom information may be calculated using Equation 1.

[0225] You can use reference Figure 6 , 7 , 8 or 11 described wireless communication management module 620 or reference Figure 8 The operations at blocks 1420 or 1425 may be performed or managed by the power headroom report generation module 805 described herein.

[0226] In some embodiments, the power headroom report may be automatically sent to the eNB for which the power headroom report is triggered. In other embodiments, the power headroom report may be sent to the eNB for which the power headroom report is triggered in response to a trigger message received from the eNB at block 1430. In the latter embodiment, and by way of example, a power headroom report triggered for a first eNB may be sent to the first eNB in ​​response to a trigger message received from the first eNB.

[0227] At block 1435, the power headroom report may be sent to the first eNB or the second eNB. In some cases, the power headroom report may be sent to the eNB for which the power headroom report is triggered (e.g., the power headroom report triggered for the first eNB may be sent to the first eNB). In other cases, the power headroom report may be sent to the eNB for which the power headroom report is triggered and to neighboring eNBs (e.g., the power headroom report triggered for the first eNB may be sent to the first eNB and the second eNB). In the latter case, the UE may, in some cases, transmit the power headroom report to the neighboring eNB based on a determination that uplink resources are allocated to the UE for uplink transmission to the neighboring eNB. Reference may be used to determine whether the UE has received a power headroom report from the neighboring eNB. Figure 6 , 7 , 8 or 11 described wireless communication management module 620 or reference Figure 8 The operations at block 1435 may be performed or managed by the power headroom report transmission module 810 as described herein.

[0228] At block 1440, a second indication including an allocation of uplink transmit power may be received from the first eNB. The second indication may be received in response to the power headroom report sent at block 1435. The second indication including an allocation of uplink transmit power may change the uplink transmit power allocated to the first eNB or the second eNB. The reference may be used Figure 6 , 7 , 8 or 11 described wireless communication management module 620 or reference Figure 7 The operations at block 1440 may be performed or managed by the uplink transmission power management module 710 described in or 8.

[0229] At block 1445, and after receiving the second indication including the allocation of uplink transmit power, the UE may determine the power headroom of the first eNB and the second eNB with respect to the uplink transmit power allocated to the first eNB or the second eNB included in the second indication of the allocation of uplink transmit power. Figure 6 , 7 , 8 or 11 described wireless communication management module 620 or reference Figure 8 The operations at block 1445 may be performed or managed by the power headroom report generation module 805 as described herein.

[0230] Therefore, the method 1400 can be used for wireless communication.It should be noted that the method 1400 is only one implementation, and the operations of the method 1400 can be rearranged or otherwise modified so that other implementations are possible.

[0231] Fig.151 is a flow chart illustrating a method 1500 for wireless communication by a UE according to various aspects of the present disclosure. Figure 1 , 2 , 3, 4, 5, 6, 7, 8 or 1 described in the UE 115 or the device 605 configured as a UE, as shown in reference Figure 1 , 2 , 3, 4, 5, 6, 9, 10 or 12 described in the first eNB 105 or the device 605 configured as the first eNB, or as described in reference Figure 1 , 2 , 3, 4, 5, 6 or 12 described in the second eNB 135 or the device 605 configured as the second eNB to describe the method 1500. In one implementation, reference Figure 6 , 7 , 8 or 11 described in the wireless communication management module 620 can execute one or more code sets for controlling the functional units of the UE 115 or the device 605 configured as a UE to perform the functions described below.

[0232] At block 1505, connections may be established with a first eNB and a second eNB, wherein each of the first eNB and the second eNB may provide radio resources for respective uplink communications to the UE. Each of the first eNB and the second eNB may also provide radio resources for respective downlink communications to the UE 115-b. In some cases, the first eNB may include a master eNB and the second eNB may include a secondary eNB. Reference may be used Figure 6 , 7 , 8 or 11 described wireless communication management module 620 or reference Figure 7 or 8 described eNB connection management module 705 to perform or manage the operation at box 1505.

[0233] At block 1510, an indication of an allocation of uplink transmit power between the first eNB and at least a second eNB may be received from a first eNB. The indication of the allocation of uplink transmit power may, in some cases, include an indication of a maximum uplink transmit power allocated to each of the first eNB and at least the second eNB. Reference may be used Figure 6 , 7 , 8 or 11 described wireless communication management module 620 or reference Figure 7 The operations at box 1510 may be performed or managed by the uplink transmission power management module 710 described in or 8.

[0234] In certain embodiments, such as when the first eNB or the second eNB operates in TDD mode, the indication including the allocation of uplink transmit power between the first eNB and at least the second eNB can be based at least in part on the UL / DL configuration of the first eNB or the second eNB. For example, when the eNB operates in TDD mode, the number of active uplink carriers can change over time based on the TDD configuration of each cell within the eNB. When the number of active uplink carriers used by the eNB is less during a particular time period, more of the total uplink transmit power available to the UE during the time period can be allocated to another eNB with which the UE can communicate during the time period. Conversely, when the number of active uplink carriers used by the eNB is greater during a particular time period, more of the total uplink transmit power available to the UE during the time period can be allocated to the eNB.

[0235] In some embodiments, the indication including the allocation of uplink transmit power between the first eNB and at least the second eNB may include an indication of a subframe over which substantially all transmit power may be allocated to the first eNB or the second eNB. For example, substantially all uplink transmit power may be allocated to one or more other eNBs during a subframe or time period in which uplink communications to the eNB are not expected.

[0236] In some cases, the indication may include a time index. The time index may be used to indicate a subframe or time period during which the eNB is allocated a specific uplink transmit power, and may be used to allocate different uplink transmit powers to different eNBs within a subframe or time period.

[0237] In some embodiments, the UE may determine the allocation of uplink transmit power between multiple cells of the first eNB or the second eNB based on an indication including the allocation of uplink transmit power between the first eNB and at least the second eNB. The allocation of uplink transmit power between the multiple cells may be semi-statically specified in the indication in some cases (e.g., the first eNB may specify or configure an uplink transmit power value for each cell, which may be used by the UE until the UE receives an adjusted indication from the first eNB including the allocation of uplink transmit power between the first eNB and at least the second eNB). The allocation of uplink transmit power between the multiple cells may be semi-statically specified in the indication according to a time index in other cases (e.g., the first eNB may specify or configure multiple uplink transmit power values ​​for each cell for each time index, which may be used by the UE until the UE receives an adjusted indication from the first eNB including the allocation of uplink transmit power between the first eNB and at least the second eNB).

[0238] In some embodiments, the indication including the allocation of uplink transmit power between the first eNB and at least the second eNB may include an allocation of the total transmit power between communications with the first eNB and the second eNB. In these embodiments, the UE may determine, at the UE, an uplink transmit power for each of a plurality of cells controlled by the first eNB or the second eNB based on the indication including the allocation of uplink transmit power between the first eNB and at least the second eNB. In some cases, the uplink transmit power per cell (e.g., the maximum uplink transmit power per cell) may be dynamically adjusted at the UE.

[0239] At block 1515, uplink communications may be sent from the UE to the first eNB and the second eNB based on an indication including an allocation of uplink transmit power between the first eNB and at least the second eNB. Figure 6 , 7 , 8 or 11 described wireless communication management module 620 or reference Figure 7 The operations at box 1515 may be performed or managed by the uplink communication management module 715 described in or 8.

[0240] At block 1520, the allocation of total uplink transmit power between the first eNB and the second eNB (or the allocation of uplink transmit power between cells) may be modified by the UE. In some cases, the UE may modify the allocation of total uplink transmit power by borrowing uplink transmit power allocated to one eNB or cell and reallocating the borrowed uplink transmit power to another eNB or cell. The modification of the allocation of total uplink transmit power may in some cases be based on the priority of uplink data or control information of one of the eNBs (e.g., the first eNB or the second eNB) with respect to other eNBs in the eNBs. The modification may also or alternatively be based on the priority of uplink data or control information of the cell. The modification may also or alternatively be based on the uplink not being used by the eNB or cell.

[0241] At block 1525, a power headroom report at the UE may be triggered based on a modification by the UE of an allocation of uplink transmit power between the first eNB and the second eNB (or between cells of one or more of the first eNB and the second eNB). In some cases, the power headroom report may include an indication that the uplink transmit power of one of the first eNB or the second eNB has exceeded a maximum transmit power allocated to the eNB.

[0242] At block 1530, a power headroom report may be generated at the UE. The power headroom report may include power headroom information for both the first eNB and the second eNB. Including power headroom information for both the first eNB and the second eNB may reduce power headroom reporting overhead and enable the eNB to estimate the total uplink transmit power used by the UE. In some examples, the power headroom information may be calculated using Equation 1.

[0243] At block 1535, a power headroom report may be sent to the first eNB or the second eNB. In some cases, the power headroom report may be sent to the eNB that received power during the modification of the allocation of uplink transmit power. Such a power headroom report may include negative power headroom information. In other cases, the power headroom report may be sent to the eNB from which power was borrowed during the modification of the allocation of uplink transmit power. The latter power headroom report may subtract the borrowed power from the configured maximum power of the eNB or cell. In the case of power headroom information per cell, Equation 2 may be used to calculate the power headroom information.

[0244] At block 1540, a second indication including an allocation of uplink transmit power may be received from the first eNB in ​​response to a modification of the allocation of uplink transmit power by the UE.

[0245] Thus, method 1500 may be used for wireless communications.It should be noted that method 1500 is only one implementation, and the operations of method 1500 may be rearranged or otherwise modified such that other implementations are possible.

[0246] Fig.16 1 is a flow chart illustrating a method 1600 of wireless communication according to various aspects of the present disclosure. Figure 1 , 2 , 3, 4, 5, 6, 9, 10 or 12 described in the first eNB 105 or the device 605 configured as the first eNB, as described in reference Figure 1 , 2 , 3, 4, 5, 6, 7, 8 or 1 described in the UE 115 or the device 605 configured as a UE, or as described in reference Figure 1 , 2 , 3, 4, 5, 6 or 12 described in the second eNB 135 or the device 605 configured as the second eNB to describe the method 1600. In one implementation, reference Figure 6 , 9 , 10 or 12 described in the wireless communication management module 620 can execute one or more code sets for controlling the functional units of the first eNB 105 or the device 605 configured as the first eNB to perform the functions described below.

[0247] At block 1605, the first eNB may coordinate multi-connection communications with at least the first eNB and the second eNB for the UE. In some cases, the first eNB may include a master eNB and the second eNB may include a secondary eNB. Figure 6 , 9 , 10 or 12 described wireless communication management module 620 or reference Fig. 9 Or the UE multi-connection management module 905 described in 10 is used to perform or manage the operations at box 1605.

[0248] At block 1610, an allocation of uplink transmit power between the first eNB and at least a second eNB may be determined for the UE. The allocation of uplink transmit power may in some cases include an allocation of a maximum uplink transmit power or a percentage of uplink transmit power to each of the first eNB and at least the second eNB. Reference may be used Figure 6 , 9 , 10 or 12 described wireless communication management module 620 or reference Fig. 9 The operations at box 1610 may be performed or managed by the uplink transmit power determination module 910 described in or 10.

[0249] In some embodiments, the first eNB may determine an allocation of uplink transmit power among a plurality of cells of the first eNB based on an indication including an allocation of uplink transmit power among the first eNB and at least a second eNB. The allocation of uplink transmit power among the plurality of cells may be semi-statically specified in the indication in some cases (e.g., the first eNB may specify or configure an uplink transmit power value for each cell, which may be used by the UE until the UE receives an adjusted indication from the first eNB including an allocation of uplink transmit power among the first eNB and at least the second eNB). The allocation of uplink transmit power among the plurality of cells may be semi-statically specified in the indication in other cases according to a time index (e.g., the first eNB may specify or configure a plurality of uplink transmit power values ​​for each cell for each time index, which may be used by the UE until the UE receives an adjusted indication from the first eNB including an allocation of uplink transmit power among the first eNB and at least the second eNB).

[0250] At block 1615, an indication of an allocation including an uplink transmit power allocation may be sent from the first eNB to the UE. Figure 6 , 9 , 10 or 12 described wireless communication management module 620 or reference Fig. 9 The operations at box 1615 may be performed or managed by the uplink transmit power communication module 915 described in or 10.

[0251] In certain embodiments, such as when the first eNB or the second eNB operates in TDD mode, the indication including the allocation of uplink transmit power between the first eNB and at least the second eNB can be based at least in part on the UL / DL configuration of the first eNB or the second eNB. For example, when the eNB operates in TDD mode, the number of active uplink carriers can change over time based on the TDD configuration of each cell within the eNB. When the number of active uplink carriers used by the eNB is less during a particular time period, more of the total uplink transmit power available to the UE during the time period can be allocated to another eNB with which the UE can communicate during the time period. Conversely, when the number of active uplink carriers used by the eNB is greater during a particular time period, more of the total uplink transmit power available to the UE during the time period can be allocated to the eNB.

[0252] In some embodiments, the indication including the allocation of uplink transmit power between the first eNB and at least the second eNB may include an indication of a subframe over which substantially all transmit power may be allocated to the first eNB or the second eNB. For example, substantially all uplink transmit power may be allocated to one or more other eNBs during a subframe or time period in which uplink communications to the eNB are not expected.

[0253] In some cases, the indication may include a time index. The time index may be used to indicate a subframe or time period during which the eNB is allocated a specific uplink transmit power, and may be used to allocate different uplink transmit powers to different eNBs within a subframe or time period.

[0254] Thus, method 1600 may be used for wireless communications.It should be noted that method 1600 is only one implementation, and the operations of method 1600 may be rearranged or otherwise modified such that other implementations are possible.

[0255] Fig.17 1 is a flow chart illustrating a method 1700 of wireless communication according to various aspects of the present disclosure. Figure 1 , 2 , 3, 4, 5, 6, 9, 10 or 12 described in the first eNB 105 or the device 605 configured as the first eNB, as described in reference Figure 1 , 2 , 3, 4, 5, 6, 7, 8 or 1 described in the UE 115 or the device 605 configured as a UE, or as described in reference Figure 1 , 2 , 3, 4, 5, 6, or 12, or one of the second eNBs 135 or the device 605 configured as the second eNB. In one implementation, reference is made to Figure 6 , 9 , 10 or 12 described in the wireless communication management module 620 can execute one or more code sets for controlling the functional units of the first eNB 105 or the device 605 configured as the first eNB to perform the functions described below.

[0256] At block 1705, the first eNB may coordinate multi-connection communications with at least the first eNB and the second eNB for the UE. In some cases, the first eNB may include a master eNB and the second eNB may include a secondary eNB. Figure 6 , 9 , 10 or 12 described wireless communication management module 620 or reference Fig. 9Or the UE multi-connection management module 905 described in 10 is used to perform or manage the operations at box 1705.

[0257] At block 1710, an allocation of uplink transmit power between a first eNB and at least a second eNB may be determined for the UE. The allocation of uplink transmit power may in some cases include an allocation of a maximum uplink transmit power or a percentage of uplink transmit power to each of the first eNB and at least the second eNB. Reference may be used Figure 6 , 9 , 10 or 12 described wireless communication management module 620 or reference Fig. 9 The operations at box 1710 may be performed or managed by the uplink transmit power determination module 910 described in or 10.

[0258] In some embodiments, the first eNB may determine an allocation of uplink transmit power among a plurality of cells of the first eNB based on an indication including an allocation of uplink transmit power among the first eNB and at least a second eNB. The allocation of uplink transmit power among the plurality of cells may be semi-statically specified in the indication in some cases (e.g., the first eNB may specify or configure an uplink transmit power value for each cell, which may be used by the UE until the UE receives an adjusted indication from the first eNB including an allocation of uplink transmit power among the first eNB and at least the second eNB). The allocation of uplink transmit power among the plurality of cells may be semi-statically specified in the indication in other cases according to a time index (e.g., the first eNB may specify or configure a plurality of uplink transmit power values ​​for each cell for each time index, which may be used by the UE until the UE receives an adjusted indication from the first eNB including an allocation of uplink transmit power among the first eNB and at least the second eNB).

[0259] At block 1715, an indication of an allocation including an uplink transmit power allocation may be sent from the first eNB to the UE. Figure 6 , 9 , 10 or 12 described wireless communication management module 620 or reference Fig. 9 The operations at box 1715 may be performed or managed by the uplink transmit power communication module 915 described in or 10.

[0260] In certain embodiments, such as when the first eNB or the second eNB operates in TDD mode, the indication including the allocation of uplink transmit power between the first eNB and at least the second eNB can be based at least in part on the UL / DL configuration of the first eNB or the second eNB. For example, when the eNB operates in TDD mode, the number of active uplink carriers can change over time based on the TDD configuration of each cell within the eNB. When the number of active uplink carriers used by the eNB is less during a particular time period, more of the total uplink transmit power available to the UE during the time period can be allocated to another eNB with which the UE can communicate during the time period. Conversely, when the number of active uplink carriers used by the eNB is greater during a particular time period, more of the total uplink transmit power available to the UE during the time period can be allocated to the eNB.

[0261] In some embodiments, the indication including the allocation of uplink transmit power between the first eNB and at least the second eNB may include an indication of a subframe over which substantially all transmit power may be allocated to the first eNB or the second eNB. For example, substantially all uplink transmit power may be allocated to one or more other eNBs during a subframe or time period in which uplink communications to the eNB are not expected.

[0262] In some cases, the indication may include a time index. The time index may be used to indicate a subframe or time period during which the eNB is allocated a specific uplink transmit power, and may be used to allocate different uplink transmit powers to different eNBs within a subframe or time period.

[0263] At block 1720, a power headroom report including power headroom information for at least a first eNB and a second eNB may be received from a UE. Fig.14 As described in block 1420 of , the power headroom report may be received in response to at least one of: an uplink transmit power of the UE to the second eNB; a measured change in the path loss of the second eNB; or an activation of an uplink cell by the second eNB. In some cases, the power headroom report may be received in response to the first eNB sending a trigger message (e.g., a request for a power headroom report) to the UE.

[0264] At block 1725, a power headroom report may optionally be sent from the first eNB to the second eNB.

[0265] In some embodiments, the power headroom report may indicate that the UE has modified the allocation of uplink transmit power between the first eNB and the second eNB, and the first eNB may determine, based on the power headroom report, that the UE has modified the allocation of uplink transmit power between the first eNB and the second eNB at block 1730. In other embodiments, the power headroom report may not indicate that the UE has modified the allocation of uplink transmit power between the first eNB and the second eNB.

[0266] At block 1735, the allocation of uplink transmit power for the UE between the first eNB and the second eNB may be adjusted based on the power headroom report. In some cases, the adjustment may be based on a modification of the allocation of uplink transmit power between the first eNB and the second eNB by the UE as determined at block 1730.

[0267] At block 1740, an allocation of the adjusted uplink transmit power may be sent to at least one of the UE or the second eNB.

[0268] In certain embodiments of the method 1700, the adjustment of the allocation of uplink transmit power for the UE between the first eNB and the second eNB at block 1735 may also or alternatively be made based on a message received at the first eNB from the second eNB. The message may include a power headroom report of the UE or information generated by the second eNB.

[0269] In certain embodiments of method 1700, the first eNB may schedule communications (eg, downlink or uplink communications) with the UE. Communications between the UE and the first eNB may be scheduled independently of communications between the UE and the second eNB.

[0270] Thus, method 1700 may be used for wireless communications.It should be noted that method 1700 is only one implementation, and the operations of method 1700 may be rearranged or otherwise modified such that other implementations are possible.

[0271] Information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0272] The various illustrative blocks and modules described in conjunction with the disclosure herein may be implemented or executed, individually or collectively, using one or more application-specific integrated circuits (ASICs) adapted to perform some or all of the functions applicable in hardware. Alternatively, the functions may be implemented or executed by one or more other processing units (or cores) such as general-purpose processors or digital signal processors (DSPs), or on one or more integrated circuits. A general-purpose processor may be a microprocessor, any conventional processor, a controller, a microcontroller, a state machine, or a combination thereof. The processor may also be implemented as a combination of computing devices, such as a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in combination with a DSP core, or any other such configuration. In other embodiments, other types of integrated circuits (e.g., structured / platform ASICs, field programmable gate arrays (FPGAs), and other semi-custom ICs) that can be programmed in any manner known in the art may be used. The functions of each block and module may also be implemented in whole or in part using instructions contained in a memory formatted to be executed by one or more general-purpose or dedicated processors.

[0273] The functions described herein can be implemented with hardware, software executed by a processor, firmware, or any combination thereof. If implemented with software executed by a processor, the function can be stored or sent as one or more instructions or codes on a computer-readable medium. Other examples and implementations are within the scope and spirit of the present disclosure and the appended claims. For example, due to the nature of software, the functions described above can be implemented using software, hardware, firmware, hard wiring, or any combination of these items executed by a processor. The features that implement the functions can also be physically placed in various locations, including being distributed so that the parts of the functions are implemented in different physical locations. In addition, as used herein (including in the claims), "or" such as when used in a list of items beginning with "at least one of ..." indicates a list of separation, so that, for example, a list "at least one of A, B, or C" represents A or B or C or AB or AC or BC or ABC (i.e., A and B and C).

[0274] Computer readable media include computer storage media and communication media, and communication media include any medium that promotes the transmission of computer programs from one place to another. Storage media can be any available medium that can be accessed by a general or special computer. As an example and not limitation, computer readable media may include: RAM, ROM, EEPROM, CD-ROM or other optical disk storage; disk storage or other magnetic storage device; or any other medium that can be used to carry or store desired program code units in the form of instructions or data structures and can be accessed by general or special computers, or general or special processors. In addition, any connection is properly referred to as computer readable media. For example, if software is sent from a website, server or other remote source using a coaxial cable, fiber optic cable, twisted pair or digital subscriber line (DSL), coaxial cable, fiber optic cable, twisted pair or DSL are included in the definition of the medium. Disks and optical disks as used herein include compact disks (CDs), laser disks, optical disks, digital versatile disks (DVDs), floppy disks and blue optical disks, wherein disks usually copy data magnetically, and optical disks copy data optically using lasers. The combination of the above items is also included in the scope of computer readable media.

[0275] The specific embodiments described above in conjunction with the accompanying drawings are provided to enable those skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the spirit or scope of the present disclosure. Throughout the present disclosure, the term "example" or "exemplary" indicates an example or instance, and does not imply or require any preference for the indicated example. For the purpose of providing an understanding of the described technology, the specific embodiments include specific details. However, these technologies can be practiced without these specific details. In some instances, well-known structures or devices are shown in block diagram form to avoid making the concept of the described embodiments difficult to understand. Therefore, the present disclosure is not intended to be limited to the examples and designs described herein, but to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of wireless communication performed by a user equipment (UE), comprising: Establishing a connection with a first base station and a second base station, wherein each of the first base station and the second base station provides the UE with radio resources for respective uplink communications; receiving, by the UE, from the first base station, an indication of allocation of uplink transmit power between the first base station and the second base station; The UE modifies the allocation of uplink transmit power in the following manner: allocating more uplink transmit power for uplink communications to the first base station than provided by the received indicated allocation by reallocating at least a portion of the uplink transmit power originally allocated to the second base station to the first base station without exceeding the maximum transmit power for the UE; or allocating more uplink transmit power for uplink communications to the second base station than provided by the received indicated allocation by reallocating at least a portion of the uplink transmit power originally allocated to the first base station to the second base station without exceeding a maximum transmit power for the UE; and Respective uplink communications are sent from the UE to the first base station and the second base station based on the modified allocation of uplink transmit power.

2. The method according to claim 1, further comprising: generating, at the UE, a power headroom report including power headroom information for both the first base station and the second base station; as well as Sending the power headroom report to the first base station.

3. The method according to claim 2, wherein: The power headroom information is calculated after receiving scheduling information from both the first base station and the second base station; and wherein the first base station and the second base station schedule communication with the UE on different sets of resources.

4. The method according to claim 2, wherein: The power headroom report is sent to the first base station or the second base station in response to a trigger message received from the first base station or the second base station.

5. The method according to claim 4, wherein: The generation of the power headroom information is based at least in part on an indication that the first base station or the second base station has activated an uplink cell.

6. The method according to claim 2, further comprising: Sending the power headroom report to the second base station.

7. The method according to claim 2, further comprising: The power headroom report is triggered at the UE based on the measured path loss of the second base station.

8. The method according to claim 1, wherein: The modified allocation of uplink transmit power is based on a priority of uplink data or control information for one of the first base station and the second base station relative to uplink data or control information for the other of the first base station and the second base station.

9. The method according to claim 1, further comprising: An uplink transmit power of each cell among a plurality of cells controlled by the first base station or the second base station is determined at the UE based on the indication.

10. The method according to claim 1, further comprising: The first base station includes a primary base station, and the second base station includes a secondary base station.

11. The method according to claim 1, wherein: The allocation includes a first maximum uplink transmit power for the first base station and a second maximum uplink transmit power for the second base station.

12. The method according to claim 11, wherein: The UE allocates more uplink transmit power for uplink communication to the second base station than the uplink transmit power provided by the second maximum uplink transmit power by reallocating at least a portion of the uplink transmit power originally allocated to the first base station to the second base station without exceeding the maximum transmit power for the UE.

13. The method according to claim 12, wherein: Allocating more uplink transmit power for uplink communications to the second base station than provided by the second maximum uplink transmit power includes: The UE borrows the uplink transmission power allocated to the first base station, and reallocates the borrowed uplink transmission power to the second base station.

14. The method according to claim 1, wherein When the first base station or the second base station operates in a TDD mode, the UE modifies the allocation of uplink transmit power based at least in part on a UL / DL configuration of the first base station or the second base station operating in the TDD mode.

15. The method according to claim 14, wherein When the first base station or the second base station operates in the TDD mode, and when the number of active uplink carriers used by the first base station is less during a specific time period, more uplink transmit power of the total uplink transmit power available to the UE during the time period is allocated to the second base station.

16. An apparatus for wireless communication at a user equipment (UE), comprising: means for establishing a connection with a first base station and a second base station, wherein each of the first base station and the second base station provides radio resources for respective uplink communications to the UE; means for receiving, at the UE, from the first base station, an indication of allocation of uplink transmit power between the first base station and the second base station; means for modifying, by the UE, allocation of uplink transmit power by: allocating more uplink transmit power for uplink communications to the first base station than provided by the received indicated allocation by reallocating at least a portion of the uplink transmit power originally allocated to the second base station to the first base station without exceeding the maximum transmit power for the UE; or allocating more uplink transmit power for uplink communications to the second base station than provided by the received indicated allocation by reallocating at least a portion of the uplink transmit power originally allocated to the first base station to the second base station without exceeding a maximum transmit power for the UE; and Means for sending respective uplink communications from the UE to the first base station and the second base station based on the modified allocation of uplink transmit power.

17. The apparatus according to claim 16, further comprising: means for generating, at the UE, a power headroom report comprising power headroom information for both the first base station and the second base station; as well as Means for sending the power headroom report to the first base station.

18. The device according to claim 17, wherein: The power headroom information is calculated after receiving scheduling information from both the first base station and the second base station; and wherein the first base station and the second base station schedule communication with the UE on different sets of resources.

19. The device according to claim 17, wherein: The power headroom report is sent to the first base station or the second base station in response to a trigger message received from the first base station or the second base station.

20. The device according to claim 19, wherein The generation of the power headroom information is based at least in part on an indication that the first base station or the second base station has activated an uplink cell.

21. The apparatus of claim 17, further comprising: Means for sending the power headroom report to the second base station.

22. The apparatus of claim 17, further comprising: means for triggering, at the UE, the power headroom report based on a measured path loss of the second base station.

23. The device according to claim 16, wherein: The modified allocation of uplink transmit power is based on a priority of uplink data or control information for one of the first base station and the second base station relative to uplink data or control information for the other of the first base station and the second base station.

24. The apparatus of claim 16, further comprising: means for determining, at the UE, uplink transmit power for each of a plurality of cells controlled by the first base station or the second base station based on the indication.

25. The apparatus of claim 16, further comprising: The first base station includes a primary base station, and the second base station includes a secondary base station.

26. The device according to claim 16, wherein: The allocation includes a first maximum uplink transmit power for the first base station and a second maximum uplink transmit power for the second base station.

27. The apparatus of claim 26, wherein: The UE allocates more uplink transmit power for uplink communication to the second base station than the uplink transmit power provided by the second maximum uplink transmit power by reallocating at least a portion of the uplink transmit power originally allocated to the first base station to the second base station without exceeding the maximum transmit power for the UE.

28. The device according to claim 27, wherein Allocating more uplink transmit power for uplink communications to the second base station than provided by the second maximum uplink transmit power includes: The UE borrows the uplink transmission power allocated to the first base station, and reallocates the borrowed uplink transmission power to the second base station.

29. The device according to claim 16, wherein When the first base station or the second base station operates in a TDD mode, the UE modifies the allocation of uplink transmit power based at least in part on a UL / DL configuration of the first base station or the second base station operating in the TDD mode.

30. The device according to claim 29, wherein When the first base station or the second base station operates in the TDD mode, and when the number of active uplink carriers used by the first base station is less during a specific time period, more uplink transmit power of the total uplink transmit power available to the UE during the time period is allocated to the second base station.

31. A method for wireless communication, comprising: Coordinating, by a first base station, multi-connection communications between a UE and at least the first base station and a second base station; determining, at the first base station, allocation of uplink transmit power between the first base station and the second base station for the UE; as well as sending, from the first base station to the UE, an indication including the allocation of uplink transmit power, wherein the allocation of uplink transmit power is modifiable at the UE by: allocating more uplink transmit power for uplink communications to the first base station than provided by the received indicated allocation by reallocating at least a portion of the uplink transmit power originally allocated to the second base station to the first base station without exceeding a maximum transmit power for the UE; or Allocate more uplink transmit power for uplink communications to the second base station than provided by the received indicated allocation by reallocating at least a portion of the uplink transmit power originally allocated to the first base station to the second base station without exceeding the maximum transmit power for the UE.

32. The method of claim 31 further comprising: Based on the message received from the second base station, an allocation of uplink transmit power between the first base station and the second base station is adjusted at the first base station.

33. The method of claim 31 , further comprising: The allocation of uplink transmit power is sent from the first base station to the second base station.

34. The method of claim 33, wherein: Sending the allocation of uplink transmit power from the first base station to the second base station includes: A message including the allocation of uplink transmit power is sent via an X2 interface between the first base station and the second base station.

35. An apparatus for wireless communication, comprising: A unit for coordinating, by a first base station, multiple connection communications for a UE with at least the first base station and a second base station; means for determining, at the first base station, allocation of uplink transmit power for the UE between the first base station and the second base station; as well as Means for sending, from the first base station to the UE, an indication including the allocation of uplink transmit power, wherein the allocation of uplink transmit power is modifiable at the UE by: allocating more uplink transmit power for uplink communications to the first base station than provided by the received indicated allocation by reallocating at least a portion of the uplink transmit power originally allocated to the second base station to the first base station without exceeding a maximum transmit power for the UE; or Allocate more uplink transmit power for uplink communications to the second base station than provided by the received indicated allocation by reallocating at least a portion of the uplink transmit power originally allocated to the first base station to the second base station without exceeding the maximum transmit power for the UE.

36. The apparatus of claim 35, further comprising: Means for adjusting, at the first base station, an allocation of uplink transmit power between the first base station and a second base station based on the message received from the second base station.

37. The apparatus of claim 35, further comprising: Means for transmitting the allocation of uplink transmit power from the first base station to the second base station.

38. The device according to claim 37, wherein Sending the allocation of uplink transmit power from the first base station to the second base station includes: Means for sending a message including the allocation of uplink transmit power via an X2 interface between the first base station to the second base station.

39. A non-transitory computer-readable medium storing code for wireless communication by a user equipment (UE), the code comprising instructions executable by a processor to: Establishing a connection with a first base station and a second base station, wherein: Each of the first base station and the second base station provides the UE with radio resources for respective uplink communications; receiving, by the UE, from the first base station, an indication of allocation of uplink transmit power between the first base station and the second base station; The UE modifies the allocation of uplink transmit power in the following manner: allocating more uplink transmit power for uplink communications to the first base station than provided by the received indicated allocation by reallocating at least a portion of the uplink transmit power originally allocated to the second base station to the first base station without exceeding a maximum transmit power for the UE; or allocating more uplink transmit power for uplink communications to the second base station than provided by the received indicated allocation by reallocating at least a portion of the uplink transmit power originally allocated to the first base station to the second base station without exceeding a maximum transmit power for the UE; as well as Respective uplink communications are sent from the UE to the first base station and the second base station based on the modified allocation of uplink transmit power.

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