WO2015018348A1 - 上行功率控制方法以及基站和用户设备 - Google Patents

上行功率控制方法以及基站和用户设备 Download PDF

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Publication number
WO2015018348A1
WO2015018348A1 PCT/CN2014/083844 CN2014083844W WO2015018348A1 WO 2015018348 A1 WO2015018348 A1 WO 2015018348A1 CN 2014083844 W CN2014083844 W CN 2014083844W WO 2015018348 A1 WO2015018348 A1 WO 2015018348A1
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Prior art keywords
user equipment
power
base station
aphr
senb
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PCT/CN2014/083844
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English (en)
French (fr)
Inventor
沈兴亚
刘仁茂
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Sharp Corp
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Sharp Corp
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Priority to JP2016532229A priority Critical patent/JP2016531505A/ja
Priority to US14/910,227 priority patent/US10264532B2/en
Publication of WO2015018348A1 publication Critical patent/WO2015018348A1/zh
Anticipated expiration legal-status Critical
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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04Transmission power control [TPC]
    • H04W52/06TPC algorithms
    • H04W52/14Separate analysis of uplink or downlink
    • H04W52/146Uplink power control
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04Transmission power control [TPC]
    • H04W52/18TPC being performed according to specific parameters
    • H04W52/22TPC being performed according to specific parameters taking into account previous information or commands
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04Transmission power control [TPC]
    • H04W52/30Transmission power control [TPC] using constraints in the total amount of available transmission power
    • H04W52/34TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04Transmission power control [TPC]
    • H04W52/30Transmission power control [TPC] using constraints in the total amount of available transmission power
    • H04W52/34TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/346TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04Transmission power control [TPC]
    • H04W52/30Transmission power control [TPC] using constraints in the total amount of available transmission power
    • H04W52/36Transmission power control [TPC] using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/365Power headroom reporting
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04Transmission power control [TPC]
    • H04W52/30Transmission power control [TPC] using constraints in the total amount of available transmission power
    • H04W52/36Transmission power control [TPC] using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/367Power values between minimum and maximum limits, e.g. dynamic range
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W68/00User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/04Wireless resource allocation
    • H04W72/044Wireless resource allocation based on the type of the allocated resource
    • H04W72/0473Wireless resource allocation based on the type of the allocated resource the resource being transmission power

Definitions

  • the present invention relates to the field of wireless communication technologies. More specifically, the present invention relates to an uplink power control method and a base station and user equipment. Background technique
  • the transmit power of the primary base station and the secondary base station are different, and the path loss between the two base stations is different. Therefore, the user's optimal access cell is different from the perspective of user uplink or downlink throughput performance.
  • the user performs cell selection or cell reselection according to RSRP, so the user accesses the cell with the strongest received signal. This means that users cannot access the best uplink and downlink cells at the same time. The best solution at this time should be that the user accesses its optimal cell separately from uplink and downlink.
  • the handover performance of a user is worse in a heterogeneous network than in a pure macro cell network, especially when the microcell and the macrocell are deployed in the same frequency.
  • the micro cell and the macro cell simultaneously provide handover related RRC signaling.
  • the frequency of handover in the microcell scenario is much higher than that in the macrocell scenario, and the high frequency cell handover will increase the signaling overhead of the access network and the core network.
  • the user's control plane bearer and the user plane bearer end at the same base station. When a user switches from one micro cell to another micro cell, the user's control plane bearer and user plane bearer need to be changed. In order to solve this problem, users can access multiple users at the same time.
  • the base station for example, the user's control plane bearer is always connected to the primary base station, and the user plane bearer can be connected to the micro cell.
  • carrier aggregation can greatly increase the user's peak rate.
  • carrier aggregation can only be done in the same base station. Therefore, in a heterogeneous network, carrier aggregation across base stations cannot currently be used, which means that the peak rate is lower in the heterogeneous network than in the carrier aggregation scenario.
  • the user can access multiple base stations at the same time, a higher peak rate can be obtained and the cell load can be optimized.
  • Simultaneous access to macro cells and micro cells is a potential solution.
  • the user accesses the macro cell and the micro cell at the same time as a technical solution.
  • the dual access in the Release-12 is called dual connectivity.
  • the dual access can be defined as multiple simultaneous access to the same or different frequency.
  • Base station In 3GPP TR 36.932, whether or not an ideal backhaul link between base stations is a possible work scenario. Among them, the base station is an ideal backhaul link, and the related technologies such as carrier aggregation (CA) and coordinated multipoint transmission (CoMP) in Release-10/11 can be used. Therefore, in Release-12, the main focus is on the working scenario of non-ideal backhaul links.
  • CA carrier aggregation
  • CoMP coordinated multipoint transmission
  • Uplink transmitter power control in mobile communication systems plays an important role in balancing the following two requirements: on the one hand, sufficient energy per bit required to achieve quality of service (QoS), and on the other hand It is to minimize the interference to other users of the system and to maximize the battery life of the mobile terminal. To achieve this, the uplink power control must adapt to the characteristics of the radio channel, including path loss, shadowing and fast fading, as well as overcoming interference from other users in the same cell and neighboring cells.
  • QoS quality of service
  • the main processes of LTE uplink power control are:
  • the User Equipment receives a TPC (Power Control Command).
  • TPC Power Control Command
  • the UE performs measurement of the received power of the downlink radio channel pilot and calculates the path loss.
  • the UE calculates the transmit power P based on parameters such as path loss, uplink shared channel bandwidth, transmission format, and TPC. If the user equipment triggers the PHR (Power Headroom Report) and satisfies the transmission condition, the user equipment also needs to send the PHR on the uplink shared channel.
  • PHR Power Headroom Report
  • the base station After receiving the PHR from the physical uplink shared channel, the base station passes the physical downlink control channel in the format DCI Format 0/1/1A/1B/1D/2/2A/2B/2C/2D/3/3A/4.
  • PDCCH transmits a TPC to the UE.
  • step (1) that is, the UE receives the power control command.
  • the PHR sent by the UE to the base station is used as the resource budget information of the PUSCH physical uplink shared channel:), and provides the basis for the uplink resource allocation for the base station. If the PHR reflects that the UE has a large power headroom, the base station can allocate more radio resources to the UE; if the PHR reflects that the UE has no or only a small power headroom, then the base station can only allocate less wireless. A resource block or a low order modulation command is given to the UE.
  • the sending of the PHR requires two steps: first, triggering, then reporting.
  • the UE triggers the PHR report when the related timer expires or the path loss change is large, or the PHR configuration/reconfiguration or the cell is activated or deactivated, and the PHR is reported to the base station after the UE obtains sufficient PUSCH resources.
  • the PHR is multiplexed as a Medium Access Control Control Unit (MAC CE) in a MAC PDU (Protocol Data Unit) and transmitted via the PUSCH.
  • MAC CE Medium Access Control Control Unit
  • PCMAX is the configured maximum transmit power of the UE.
  • SEM spectrum emission shielding
  • ACLR adjacent band leakage ratio
  • the UE is required to reduce the maximum transmit power (also known as power backoff:).
  • the UE can simultaneously access the macro cell and the micro cell.
  • the macro cell and the micro cell discussed above should be understood as a macro base station and a micro base station, so the cell here is to be understood as a base station. Since the base stations are not ideal backhaul links, the UE needs to transmit uplink signals (ACK/NACK, CSI information, UL-SCH, etc.) to the macro cell/base station and the micro cell/base station, respectively.
  • uplink signals ACK/NACK, CSI information, UL-SCH, etc.
  • the cell/base station to which the user equipment access is divided into a primary cell/base station and a secondary cell/base station.
  • each base station includes multiple cells for the user, so the primary base station and the secondary base station may be referred to as a primary cell group and a secondary cell group.
  • the main object of the present invention is to provide a solution for user uplink power control in a dual access scenario.
  • the configured maximum transmit power of the UE may be configured according to different cells/base stations that are accessed, and the minimum guaranteed transmit power P MeNB and the secondary cell may be configured as the primary cell.
  • the minimum guaranteed transmit power P-SeNB and the remaining power (if any) are configured.
  • the so-called primary cell configuration minimum guaranteed transmit power and the secondary cell minimum guaranteed transmit power refer to the minimum uplink transmit power allocated by the user equipment on the cell.
  • These minimum guaranteed transmit powers can be configured by the network side or by the UE side. If configured by the network side, the primary base station can inform the secondary base station of these parameters through the backhaul link or through the UE.
  • the UE can inform the primary base station and the secondary base station through the newly designed PHR including these parameters.
  • an uplink power control method including: a primary base station determines a minimum guaranteed transmit power of a user equipment in a primary cell, a P-MeNB, and a minimum guaranteed transmit power in a secondary cell, P-SeNB; The base station notifies the P-SeNB and/or the P-MeNB to the secondary base station corresponding to the secondary cell; and notifies the user equipment of the P-MeNB and/or the P-SeNB.
  • the primary base station notifies the P-SeNB and/or the P-MeNB to the secondary base station corresponding to the secondary cell by using the reserved power indication message.
  • the primary base station informs the user equipment of the P-MeNB and/or the P-SeNB through radio resource control RRC signaling.
  • the primary base station notifies the user equipment of the P-MeNB through RRC signaling
  • the secondary base station notifies the user equipment of the P-SeNB through RRC signaling
  • the method further includes: the primary base station and the secondary base station respectively receive a power headroom report PHR sent by the user equipment, and calculate an actual transmit power of the user equipment based on the PHR.
  • an uplink power control method including: a primary base station determining a minimum guaranteed transmit power P-MeNB of a user equipment in a primary cell and/or a minimum guaranteed transmit power P-in a secondary cell configuration And the primary base station notifies the user equipment of the P-MeNB and/or the P-SeNB by using radio resource control RRC signaling.
  • the user equipment reports the P-SeNB to the secondary base station corresponding to the secondary cell by the enhanced power margin report.
  • the user equipment notifying the P-SeNB to the secondary base station corresponding to the secondary cell by using the enhanced power headroom report aPHR includes: determining whether the trigger condition of the aPHR is met; if the trigger condition of the aPHR is met, transmitting the aPHR.
  • the triggering condition includes at least one of the following: the user equipment activates the dual access state; the power headroom report of the data channel of the carrier is triggered; receives the RRC signaling sent by the base station; and default configuration of the user equipment To report the enhanced power headroom report; the configured periodic timer timeout for triggering the reporting of the power headroom report; the configured forbidden reporting timer for disabling the transmission of the power headroom report Timeout, and the measured path loss changes beyond the threshold.
  • the method further includes: receiving, by the primary base station, a power headroom report PHR sent by the user equipment, and calculating an actual transmit power of the user equipment in the primary cell based on the PHR; and receiving, by the secondary base station, the enhanced power margin sent by the user equipment
  • the aPHR is reported, and the actual transmit power of the user equipment in the secondary cell is calculated based on the aPHR.
  • an uplink power control method including: determining, by a user equipment, a minimum guaranteed transmit power P-MeNB in a primary cell and a configured minimum guaranteed transmit power P-SeNB of a secondary cell; and a user
  • the device notifies the primary base station and the secondary base station of the P-MeNB and the P-SeNB by the enhanced power headroom report aPHR.
  • the user equipment notifies the primary base station and the secondary base station of the P-MeNB and the P-SeNB by the enhanced power headroom report aPHR, respectively, including: determining whether the trigger condition of the aPHR and/or the PHR is met; if the aPHR and/or are met Or the triggering condition of the PHR, transmitting the aPHR and/or in one embodiment, the triggering condition comprises at least one of the following: the user equipment activates the dual access state; the power headroom report of the data channel of the carrier is triggered; The RRC signaling sent by the base station; the default configuration of the user equipment is to report the enhanced power headroom report; the configured periodic timer for triggering the reporting of the power headroom report is timed out; The prohibition reporting timer of the transmission of the power headroom report times out, and the measured path loss changes exceed the threshold.
  • the method further includes: the primary base station and the secondary base station receiving the enhanced power headroom report aPHR sent by the user equipment, and calculating the actual transmit power of the user equipment based on the aPHR.
  • an uplink power control method including: a user equipment obtains a configured minimum guaranteed transmit power P-MeNB in a primary cell and a configured minimum guaranteed transmit power P SeNB of a secondary cell; and if satisfied For power reduction conditions, power reduction is performed.
  • the power reduction condition comprises: the power of any one of the base stations to schedule the user equipment is greater than the configured minimum guaranteed transmission power of the base station, and the total transmit power of the user equipment is greater than the total configured maximum transmit power.
  • the user equipment preferentially reduces the transmit power on the camped cell group by more than the configured minimum guaranteed transmit power plus the remaining power (P_MeNB+P_ remaining)
  • the power reduction condition comprises: the power of all base station scheduling user equipments is greater than the configured minimum guaranteed transmission power of the base station, and the total transmission power of the user equipment is greater than the total configured maximum transmission power. If the power reduction condition is met, the user equipment reduces the transmit power on each of the cell groups. The way power is reduced on each resident cell group, such as
  • an uplink power allocation method for allocating uplink power of a user equipment on each accessed base station, the method comprising:: accessing a primary base station or a secondary At the base station, the allocated power reaches the P-MeNB or the P-SeNB. Specifically, when the user is scheduled, each base station corresponding to the access first allocates power to the P-SeNB or the P-MeNB, respectively, without obeying the power allocation priority principle, and the transmitting power of the user equipment is the user equipment. The smaller of the transmit power required for scheduling and the minimum guaranteed transmit power configured by the user equipment, the transmit power required by the user equipment for the secondary scheduling is determined by the uplink grant and the TPC command; and the remaining power is allocated.
  • a base station including: a determining unit configured to determine a minimum guaranteed transmit power P-MeNB of a user equipment in a primary cell and a minimum guaranteed transmit power P-SeNB in a secondary cell And a sending unit configured to transmit the determined P-MeNB and the P-SeNB.
  • the sending unit is configured to: notify the P SeNB to the secondary base station corresponding to the secondary cell, and notify the user equipment of the P MeNB and the P SeNB. In an embodiment, the sending unit is configured to: notify the P-SeNB to the secondary base station corresponding to the secondary cell by using the reserved power indication message, and notify the user equipment of the P through the radio resource control RRC signaling. MeNB and P-SeNB.
  • the base station further includes: a receiving unit configured to receive a power headroom report PHR sent by the user equipment, and calculate an actual transmit power of the user equipment based on the PHR.
  • a receiving unit configured to receive a power headroom report PHR sent by the user equipment, and calculate an actual transmit power of the user equipment based on the PHR.
  • a user equipment including: a determining unit, configured to determine a configuration minimum guaranteed transmit power P_MeNB of the user equipment in a primary cell and a minimum guaranteed transmit power P of a secondary cell - a SeNB; and a transmitting unit configured to notify the primary base station and the secondary base station of the P-MeNB and the P-SeNB by the enhanced power headroom report a PHR, respectively.
  • the transmitting unit is configured to: determine whether a trigger condition of aPHR is satisfied; and if a trigger condition of aPHR is satisfied, send aPHR.
  • the triggering condition includes at least one of the following: the user equipment activates the dual access state; the power headroom report of the data channel of the carrier is triggered; receives the RRC signaling sent by the base station; and default configuration of the user equipment To report the enhanced power headroom report; the configured periodic timer timeout for triggering the reporting of the power headroom report; the configured forbidden reporting timer for disabling the transmission of the power headroom report Timeout, and the measured path loss changes beyond the threshold.
  • a user equipment including: an obtaining unit, configured to acquire a configuration minimum guaranteed transmit power P_MeNB of the user equipment in the primary cell and a minimum guaranteed transmit power P of the secondary cell - a SeNB; and a power reduction unit configured to perform power reduction if the power reduction condition is met.
  • the power reduction condition comprises: the power of any one of the base stations to schedule the user equipment is greater than the configured minimum guaranteed transmission power of the base station, and the total transmission power of the user equipment is greater than the total configured maximum transmission power.
  • the power reduction condition comprises: the power of all base station scheduling user equipments is greater than the configured minimum guaranteed transmission power of the base station, and the total transmission power of the user equipment is greater than the total configured maximum transmission power.
  • FIG. 1 is a flowchart of an uplink power control method according to an embodiment of the present invention
  • FIG. 2 is a flowchart of an uplink power control method according to another embodiment of the present invention
  • FIG. 3 is an enhanced power headroom according to an embodiment of the present invention.
  • FIG. 4 is a flowchart of an X2-AP process according to an embodiment of the present invention
  • FIG. 5a is a structural diagram of a MAC CE for enhancing power headroom reporting according to an embodiment of the present invention
  • FIG. 5b is a structural diagram of another MAC CE for enhancing power headroom reporting according to an embodiment of the present invention.
  • FIG. 5c is a structural diagram of another MAC CE for enhancing power headroom reporting according to an embodiment of the present invention.
  • FIG. 6 is a flowchart of an uplink power control method according to another embodiment of the present invention.
  • FIG. 7 is a flowchart of an uplink power control method according to another embodiment of the present invention.
  • FIG. 8 is a base station according to another embodiment of the present invention.
  • FIG. 9 is a block diagram of a user equipment according to another embodiment of the present invention.
  • FIG. 10 is a block diagram of a user equipment in accordance with another embodiment of the present invention. detailed description
  • the user equipment when the user equipment resides on more than one cell/base station (for example, two cells/base stations), the user equipment is configured with a configured maximum transmit power PCMAX on each component carrier ; C and the user equipment is in Each cell/base station on which it resides is configured with RRC signaling to configure a maximum transmit power, denoted here as P C MAX, M and P C MAX, S .
  • the user equipment divides the total configured maximum transmit power PCMAX into the total cell of the primary base station according to the maximum configured transmit power P M , CMAX and/or the total configured transmit power P S , CMAX of the secondary base station cell.
  • each base station accessed by the dual access user mentioned above is configured with an uplink maximum transmit power on the cell group to which the base station belongs, according to the power reduction example mentioned later. (See [1]) and Example 2 (see [2]) It can be inferred that the user can use the remaining transmit power in addition to the configured maximum transmit power, ie the actual transmit power can be greater than the configured maximum transmit power.
  • the value of the P-MeNB and the P-SeNB may range from -40 dBm to 23 dBm, and the sum of the two should be less than the total configured maximum transmit power of the user equipment.
  • S is a proportional coefficient whose value is a number greater than 0 and less than 1.
  • the uplink power allocation method at each of the accessed base stations can be determined by the following method:
  • the user power allocation can reach P-MeNB or P-SeNB. Specifically, when the user is scheduled, each base station user corresponding to the access first allocates power to the P-SeNB or the P-MeNB, respectively, and does not need to comply with the power allocation priority principle. Therefore, the transmission power of the user at this time is the transmission power required by the user for the current scheduling (this power The smaller of the minimum guaranteed transmit powers that are determined by the upstream grant and the TPC command) and the user is configured.
  • the user For the allocation of remaining power, the user is scheduled first on any base station that is accessed, and the remaining power can be used preferentially.
  • FIG. 1 is a flow chart of an uplink power control method in accordance with one embodiment of the present invention.
  • the primary base station in the LTE network configures the minimum guaranteed transmit power of the user equipment in each cell configuration, and informs the secondary base station through the backhaul link.
  • method 10 begins at step S100.
  • step S110 the primary base station determines the minimum guaranteed transmit power P_MeNB of the user equipment in the primary cell and the minimum guaranteed transmit power P_SeNB in the secondary cell.
  • the primary base station notifies the P-SeNB to the secondary base station corresponding to the secondary cell.
  • the primary base station may notify the secondary base station of the value of the P-SeNB through the X2 interface.
  • the X2-AP process is initiated.
  • the base station accessed by the user equipment such as Release-10/11, normally schedules the user equipment.
  • this X2-AP can be called a reserved power indication message.
  • the process of reserving the power indication message is initiated by the primary base station, and the information contained in the X2-AP is used to inform the secondary base station related user equipment of the configured maximum transmit power at the base station. This process can use user equipment related signaling.
  • the primary base station informs the secondary base station user equipment of the reserved power value by transmitting a reserved power message. After receiving the reserved power message, the secondary base station uses the corresponding reserved power value to schedule the relevant user equipment.
  • the secondary base station ignores this message.
  • the structure of the reserved power indication message included in the process and the reserved power information element included in the message may be designed as follows: Table 1 Reserved power indication message
  • the reserved power value is the reserved power value of the user equipment provided by the corresponding cell, that is, the minimum guaranteed UE's configuration on the secondary base station is the minimum guaranteed transmit power P_SeNB value, which is used for scheduling.
  • P_SeNB value the minimum guaranteed transmit power
  • step S130 the primary base station notifies the user equipment of the P MeNB and the P SeNB.
  • the pass The knowledge process can be implemented in several ways. Below, a few examples are given to illustrate.
  • Example 1 The primary base station minimizes the transmission power of the user equipment on different camping cells.
  • the P-MeNB and the P-SeNB inform the user equipment through RRC signaling. These two parameters are used for uplink power control, for example, can be placed in IE UplinkPowerDedicated:
  • the P-MeNB and the P-SeNB correspond to the P-MeNB and the P-SeNB, and the value ranges from -40 dBm to 23 dBm.
  • Example 2 The primary base station and the secondary base station respectively configure the minimum guaranteed transmission power of the user equipment on different camping cells.
  • the P-MeNB and the P-SeNB inform the user equipment through RRC signaling. These two parameters are used for uplink power control and can be placed in IE UplinkPowerDedicated:
  • the P-XeNB corresponds to the P-MeNB or the P-SeNB, and the value ranges from -40 dBm to 23 dBm.
  • method 10 can include step S140.
  • the primary base station receives the power headroom report PHR sent by the user equipment, and calculates the actual transmit power of the user equipment based on the PHR.
  • the primary base station and the secondary base station receive a power headroom report (PHR:) sent by the user equipment.
  • PHR power headroom report
  • the primary base station can calculate the actual transmit power of the user equipment on each camped cell.
  • the primary base station or the secondary base station uses P-MeNB or P-SeNB instead of P CMAX as the maximum transmit power configured on each camped cell. In this way, the base station can accurately schedule the user equipment by the actual transmit power on the camped cell and the configured minimum guaranteed transmit power.
  • method 10 ends at step S150.
  • 2 is a flow chart of an uplink power control method according to another embodiment of the present invention.
  • the primary base station configures the user equipment to configure minimum guaranteed transmit power in each camped cell, and informs the secondary base station through the user equipment.
  • method 20 begins at step S200.
  • step S210 the primary base station determines the minimum guaranteed transmit power P-MeNB of the user equipment in the primary cell and the minimum guaranteed transmit power P-SeNB in the secondary cell.
  • the primary base station communicates with the user equipment by using radio resource control RRC signaling.
  • RRC signaling may inform the user equipment of the minimum guaranteed transmit power P_MeNB and the P-SeNB of the user equipment on different camping cells through RRC signaling.
  • this RRC signaling is the same as the RRC signaling configuration example 1 described in the foregoing.
  • P-M-cmax and P-S-cmax correspond to P-MeNB and P-SeNB, and the value ranges from -40dBm to 23dBm.
  • the method 20 includes step S230.
  • the user equipment reports the P-SeNB to the secondary base station corresponding to the secondary cell by using the enhanced power headroom report aPHR.
  • aPHR the transmission process of aPHR will be described in detail in conjunction with FIG. 3.
  • the dual connectivity state that is, from single access to dual access
  • the primary base station configures the corresponding configured minimum guaranteed transmission power of the user equipment, and the enhanced power margin report of the user equipment is triggered (310).
  • aPHR aPHR
  • the triggering condition includes at least one of the following conditions: a power headroom report of the data channel of the carrier is triggered; receiving an infinite resource control RRC signaling sent by the base station; and a default configuration of the user equipment is reporting the enhanced power a residual amount report; a configured periodic timer for triggering reporting of the power headroom report; a configured prohibition reporting timer timeout, the prohibition report being topped for prohibiting during the prohibition reporting timer timing
  • the power headroom report is reported, and the measured path loss changes over a threshold; the user equipment has executed more than one configured TPC command; the user equipment is configured with a new Scell.
  • the user equipment transmits aPHR instead of the PHR in Release-10/ll.
  • aPHR as shown in Figure 5a.
  • the last bit of the first byte is set to "1". This bit may be referred to as indication information, indicating that the power headroom report contains the minimum guaranteed transmit power of the user equipment on the secondary base station P-SeNB or the minimum guaranteed transmission. Power ratio ⁇ or total power headroom on the cell.
  • the minimum guaranteed transmit power P-SeNB is configured to be encapsulated in n bits included in the power headroom report in a predetermined order.
  • the representation of P SeNB in aPHR can be Divided into: Example 1: Referring to the mapping method of P CMAX and e in PHR, P XeNB can be mapped to the following table: Table 4P c, CMAX mapping
  • X may be M or S, referring to a macro base station or a secondary base station.
  • the user equipment learns the value of the P SeNB through the RRC signaling of the primary base station.
  • Example 2 As shown in Figure 5b, the user equipment has a total configured maximum transmit power P C MAX because of backward compatibility. To this end, design a parameter S as a scaling factor, so that
  • P_XeNB S*P CMAX .
  • X can be M or S.
  • the parameter ⁇ consists of y bits, where y is a natural number. Specifically, in an example, the value of the parameter ⁇ may be ⁇ 0, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1 ⁇ , and the parameter ⁇ is three bits. In another example, the parameter ⁇ can also be a percentage of INTEGER l- lOO), where 1 represents the smallest percentage and 100 represents the largest percentage. At this time, the parameter ⁇ is seven bits. A detailed description of the various parameters in the figure can be found in TS 36.3216.1.3.6a.
  • Example 3 As shown in Figure 5c, the user equipment already knows its minimum guaranteed transmit power in the secondary base station cell, and the user equipment already knows its actual transmit power at the secondary base station cell. therefore, The total power headroom on each component carrier of the secondary base station cell can be calculated at the user equipment. Unlike the previous embodiment, the total power headroom is added to the power headroom report to form an enhanced power headroom report (aPHR). Obviously, the total power headroom value is mapped in the same way as the power headroom.
  • aPHR enhanced power headroom report
  • method 20 can include step S240.
  • the primary base station receives the power headroom report PHR sent by the user equipment, and calculates the actual transmit power of the user equipment in the primary cell based on the PHR; and the secondary base station receives the enhanced power headroom report aPHR sent by the user equipment, and calculates the user based on the aPHR.
  • the primary base station is replaced by P-MeNB
  • PCMAX is configured as the minimum guaranteed transmit power on the camping cell. In this way, the primary base station accurately schedules the user equipment by the actual transmit power on the camped cell and the configured minimum guaranteed transmit power.
  • the secondary base station uses P-SeNB instead of P CMAX as the minimum guaranteed transmit power configured on the camped cell. In this way, the secondary base station accurately schedules the user equipment by using the actual transmit power on the camped cell and configuring the minimum guaranteed transmit power.
  • method 20 ends at step S250.
  • 6 is a flow chart of an uplink power control method according to another embodiment of the present invention.
  • the user equipment determines to configure the maximum transmit power P_MeNB and the P-SeNB, and informs the primary base station and the secondary base station through the aPHR.
  • method 60 begins at step S600.
  • the primary base station and the secondary base station respectively configure the maximum transmit power of the user equipment on the primary cell and the secondary cell through RRC signaling, which is denoted as P CMAX , M And PCMAX, S.
  • P CMAX , M And PCMAX, S the values of these two parameters range from -29dBm to 23dBm.
  • step S610 the user equipment determines its configured minimum guaranteed transmit power P-MeNB in the primary cell and/or the configured minimum guaranteed transmit power P-SeNB of the secondary cell. At least one of the following conditions must be met:
  • step S620 the user equipment notifies the primary base station and the secondary base station of the P-MeNB and the P-SeNB by the enhanced power headroom report aPHR.
  • the transmission process of the aPHR has been elaborated above in conjunction with FIG. 3, and therefore the description will not be repeated here.
  • step S630 the primary base station and the secondary base station receive the enhanced power headroom report aPHR sent by the user equipment, and calculate the actual transmit power of the user equipment based on the aPHR.
  • Each base station uses P-MeNB or P-SeNB instead of P CMAX as the maximum transmit power configured on the camped cell. In this way, each base station can accurately schedule the user equipment by the actual transmit power on the camped cell and the configured maximum transmit power.
  • FIG. 7 is a flow chart of an uplink power control method according to another embodiment of the present invention. As shown in Figure 7, method 70 begins at step S700.
  • step S710 the user equipment obtains the configured minimum guaranteed transmit power P_MeNB in the primary cell and the configured minimum guaranteed transmit power P_SeNB of the secondary cell.
  • step S720 it is judged whether the power reduction condition is satisfied. If it is satisfied, power scaling: is performed.
  • the power reduction condition may include: the power of any one of the base stations to schedule the user equipment is greater than the minimum guaranteed transmission power of the user equipment at the base station, and the total transmission power of the user equipment is greater than the total configured maximum transmission power of the user equipment.
  • the power reduction condition may include: the power of all base station scheduling user equipments is greater than the configured minimum guaranteed transmission power of the user equipment at the base station, and the total transmission power of the user equipment is greater than the total configured maximum transmission power of the user equipment.
  • the user equipment can obtain its configured minimum guaranteed transmit power P_MeNB and P-SeNB in each camped cell through RRC signaling.
  • the user equipment itself may determine its configured minimum guaranteed transmit power P-MeNB and P-SeNB at each camped cell.
  • the user equipment can then operate in the manner described in the Release-10/ll standard specification.
  • the user equipment uses the P-MeNB and the P-SeNB instead of the P CMAX as the user equipment to configure the maximum transmit power on the camped cell, and uses this as a basis for power reduction.
  • Example 1 When the power of the user equipment scheduled by any base station is greater than the minimum guaranteed transmit power of the base station configuration, and the total transmit power of the user equipment is less than the total configured maximum transmit power,
  • Example 2 When the power of the user equipment of any base station is greater than the minimum guaranteed transmission power of the base station configuration, and the total transmission power of the user equipment is greater than the total configured maximum transmission power,
  • Example 3 When the power of all user equipments scheduled by the base station is greater than the maximum transmit power of the base station configuration, the total transmit power of the user equipment is greater than the total configured maximum transmit power. which is
  • FIG. 8 is a block diagram of a base station in accordance with another embodiment of the present invention.
  • the base station 80 includes a determining unit 810 and a transmitting unit 820.
  • base station 80 also includes receiving unit 830.
  • the base station 80 shown in Figure 8 can be used to perform the method shown in Figures 1-2.
  • the determining unit 810 is configured to determine the minimum guaranteed transmit power P-MeNB of the user equipment in the primary cell and the minimum guaranteed transmit power P-SeNB in the secondary cell.
  • the transmitting unit 820 is configured to transmit the determined P-MeNB and P-SeNB.
  • the transmitting unit 820 may notify the P-SeNB to the secondary base station corresponding to the secondary cell, and notify the user equipment of the P-MeNB and the P-SeNB.
  • the sending unit 820 notifies the P-SeNB to the secondary base station corresponding to the secondary cell by using the reserved power indication message, and notifies the user equipment of the P-MeNB and the P-SeNB by using the radio resource control RRC signaling.
  • the receiving unit 830 is configured to receive the power headroom report PHR and/or the enhanced power headroom report a PHR transmitted by the user equipment, and calculate the actual transmit power and the remaining schedulable power of the user equipment based on the PHR and/or the aPHR.
  • FIG. 9 is a block diagram of user equipment 90 in accordance with another embodiment of the present invention. As shown in FIG. 9, the user equipment 90 includes a determining unit 910 and a transmitting unit 920. The user equipment 90 shown in FIG. 9 can For performing the method shown in FIG. 6.
  • the determining unit 910 is configured to determine a configuration minimum guaranteed transmit power P-MeNB of the user equipment in the primary cell and a configured minimum guaranteed transmit power P-SeNB of the secondary cell.
  • the transmitting unit 920 is configured to notify the primary base station and the secondary base station of the P-MeNB and the P-SeNB by the enhanced power headroom report aPHR, respectively. Preferably, the transmitting unit 920 first determines whether the trigger condition of aPHR and/or PHR is satisfied. If the trigger condition of aPHR and / or PHR is met, aPHR and / or PHR are sent.
  • the triggering condition may include at least one of the following: the user equipment activates the dual access state; the power headroom report of the data channel of the carrier is triggered; receives the RRC signaling sent by the base station; and the default configuration of the user equipment is to report the enhanced power balance a periodic report that is configured to trigger reporting of the power headroom report; a configured timeout timer for prohibiting transmission of the power headroom report is timed out, and the measured path is measured The change in loss exceeds the threshold.
  • Figure 10 is a block diagram of user equipment 100 in accordance with another embodiment of the present invention. As shown in FIG. 10, the user equipment 100 includes an acquisition unit 110 and a power reduction unit 120. The user device 100 shown in Figure 10 can be used to perform the method shown in Figure 7.
  • the obtaining unit 110 is configured to acquire the configured minimum guaranteed transmit power P_MeNB of the user equipment in the primary cell and the configured minimum guaranteed transmit power P-SeNB of the secondary cell.
  • the power reduction unit 120 is configured to perform power reduction if the power reduction condition is satisfied.
  • the power reduction condition may include: the power of any one of the base stations to schedule the user equipment is greater than the configured minimum guaranteed transmission power of the base station, and the total transmission power of the user equipment is greater than the total configured maximum transmission power.
  • the power reduction condition comprises: the power of all base station scheduling user equipments is greater than the configured minimum guaranteed transmission power of the base station, and the total transmission power of the user equipment is greater than the total configured maximum transmission power.
  • the present application proposes several uplink power control methods for dual access user equipment. The technical solution proposed in the present application can improve the uplink resource utilization rate and improve the spectrum/energy efficiency of the LTE supporting dual access user equipment.
  • the above-described embodiments of the present invention can be implemented by software, hardware, or a combination of both software and hardware.
  • the base station and various components inside the user equipment in the above embodiments may be implemented by various devices including but not limited to: analog circuit devices, numbers Word circuit devices, digital signal processing (DSP) circuits, programmable processors, application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), programmable logic devices (CPLDs), and more.
  • DSP digital signal processing
  • ASICs application specific integrated circuits
  • FPGAs field programmable gate arrays
  • CPLDs programmable logic devices
  • base station refers to a mobile communication data and control switching center having a large transmission power and a relatively large coverage area, including resource allocation scheduling, data reception and transmission, and the like.
  • user equipment refers to a user mobile terminal, for example, a terminal device including a mobile phone, a notebook, etc., which can perform wireless communication with a base station or a secondary base station.
  • embodiments of the invention disclosed herein may be implemented on a computer program product.
  • the computer program product is a product having a computer readable medium encoded with computer program logic that, when executed on a computing device, provides related operations to implement The above technical solution of the present invention.
  • the computer program logic When executed on at least one processor of a computing system, the computer program logic causes the processor to perform the operations (methods) described in the embodiments of the present invention.
  • Such an arrangement of the present invention is typically provided as software, code and/or other data structures, such as one or more, disposed or encoded on a computer readable medium such as an optical medium (e.g., CD-ROM), floppy disk, or hard disk.
  • Software or firmware or such a configuration may be installed on the computing device such that one or more processors in the computing device perform the technical solutions described in the embodiments of the present invention.

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Abstract

本申请提供了一种上行功率控制方法,包括:主基站确定用户设备在主小区的配置最大发射功率P_MeNB和在辅小区的配置最大发射功率P_SeNB;主基站向与辅小区相对应的辅基站通知P_SeNB;以及向所述用户设备通知P_MeNB和P_SeNB。还提供了一种相应的基站和用户设备。

Description

上行功率控制方法以及基站和用户设备 技术领域
本发明涉及无线通信技术领域。 更具体地, 本发明涉及上行功率控制 方法以及基站和用户设备。 背景技术
数十年来, 无线通信技术的大发展促进了社会的进歩, 并深刻的影响 和改变了人们的生产和生活方式。 与此同时, 人们对于更优质的移动通信 业务的需求又推动了无线通信技术的快速发展。第四代移动通信系统(4G) 正是在这一背景下诞生与发展的。 为了达到第四代移动通信系统所要求的 性能, 3GPP在其 IMT-Advanced系统技术标准之一的 LTE-Advanced系统演 进技术中引入了多种新的技术,例如中继技术 (Relay)、载波聚合技术 (CA)、 多点协作传输技术(CoMP)等等。其中微小区的引入是为了增强热点覆盖、 减少网络盲区、 改善网络边缘用户服务性能、 提高网络系统容量。
在异构网中, 主基站和辅基站的发射功率不同, 而用户到两个基站间 的路径损耗不同, 因此从用户上行或下行吞吐量性能考虑, 用户的最佳接 入小区不同。 在 LTE中, 用户会根据 RSRP进行小区选择或小区重选, 因 此用户会接入其接收信号最强的小区。 这意味着用户不能同时接入上下行 最优的小区。 此时的最佳方案应当是用户上下行分别接入其最优小区。
在 3GPP TR 36.839中, 用户的切换性能在异构网中较其在纯宏小区网 络中差, 尤其当微小区和宏小区同频部署时。 为了避免这种问题, 保障用 户移动的鲁棒性并同时增强负载均衡, 一种解决方案是微小区与宏小区同 时提供切换相关的 RRC信令。
在 3GPP TR 36.839中提到, 微小区场景下切换的发生的频率远远高于 宏小区场景, 而高频率的小区切换将会增加接入网和核心网的信令开销。 在当前的 LTE架构中, 用户的控制平面承载和用户平面承载结束在同一个 基站。 当用户从一个微小区切换到另一个微小区时, 用户的控制平面承载 和用户平面承载就需要改变。 为了解决这一问题, 用户可同时接入到多个 基站, 譬如用户的控制平面承载一直连接至主基站, 而用户平面承载可连 接至微小区。
在 Release-10和 Release-11中,载波聚合可极大的提高用户的峰值速率。 但是受限于延迟, 载波聚合只能在同一个基站内完成。 因此在异构网中, 当前还不能使用跨基站的载波聚合, 这意味着在异构网中用户相较于载波 聚合场景下, 峰值速率较低。 此时如果用户能同时接入多个基站, 则可以 获得较高的峰值速率并优化小区负载。
同时接入宏小区和微小区是一种潜在的解决方案。 用户同时接入宏小 区和微小区作为一种技术解决方案在 Release-12 被称作双接入 (Dual connectivity) 双接入可定义为用户可同时接入工作在同频或异频的多个基 站。 在 3GPP TR 36.932中, 基站间是否是理想回程链路均是可能的工作场 景。其中,基站间是理想回程链路可使用 Release-10/ll中的载波聚合(CA)、 协作多点传输(CoMP) 等相关技术。 因此, 在 Release-12中, 主要关注非 理想回程链路的工作场景。
移动通信系统中的上行发射机功率控制起到很重要的作用, 即在以下 两个需求方面取得平衡: 一方面是为达到服务质量(QoS)所需要的足够的 每比特发射能量, 另一方面是最小化对系统其他用户的干扰以及最大化移 动终端电池寿命的要求。 为了实现这一目的, 上行功率控制必须自适应无 线传播信道特性, 包括路径损耗、 阴影效应和快衰落以及克服来自同一小 区和相邻小区其他用户的干扰。
LTE的上行功率控制的主要过程为:
(1) 用户设备 (UE) 接收到 TPC (功率控制命令)。
(2) UE进行下行无线信道导频接收功率的测量并计算路径损 耗。 UE基于路径损耗、 上行共享信道带宽、 传输格式和 TPC等参 数来计算发射功率 P。 如果用户设备触发了 PHR(Power Headroom Report, 功率余量报告)并满足发送条件, 那么用户设备还需要在上 行共享信道上发送 PHR。
(3) 基站从物理上行共享信道接收到 PHR后,通过格式为 DCI Format 0/1/1A/1B/1D/2/2A/2B/2C/2D/3/3A/4 的物理下行控制信道
(PDCCH)向 UE发送 TPC。
(4) 返回到歩骤 (1), 即 UE接收到功率控制命令。 在上述歩骤 和 中, UE向基站发送的 PHR作为 PUSCH物理上行 共享信道:)的资源预算信息, 为基站提供上行链路资源分配的依据。 如果 PHR反映出 UE有较大的功率余量, 那么基站可以分配较多的无线资源给 UE; 如果 PHR反映出 UE已经没有或者只有很少的功率余量, 那么基站只 能分配较少的无线资源块或者低阶调制命令给 UE。 PHR的发送需要两个歩 骤: 首先是触发, 然后是上报。 UE在相关定时器到期或者路径损耗变换较 大或者 PHR配置 /重配置或者小区激活或取消激活时触发 PHR上报, 并且 当 UE获得了足够的 PUSCH资源后向基站上报 PHR。 PHR作为媒体接入 控制控制单元(MAC CE)被复用在 MAC PDU(协议数据单元)中,经 PUSCH 发送。
PCMAX为 UE的配置最大发射功率。 PCMAX的取值范围主要有两种受限 因素: 1) 受限于基站的控制; 2) UE的无用带外辐射, 如为了满足频谱发射 屏蔽 (SEM)和邻带泄露比 (ACLR)等要求, UE 降低最大发射功率 (也称为 功率回退:)。
综上所述, 在 Release-12中由于引入了双接入这种新的技术, UE可以 同时接入宏小区和微小区。 此处需要说明, 在上文中论述的宏小区和微小 区应理解为宏基站和微基站, 故此处的小区需理解为基站。 由于基站间不 是理想回程链路, 所以 UE需要分别向宏小区 /基站和微小区 /基站传输上行 信号 (ACK/NACK、 CSI信息、 UL-SCH等)。 同时, 因为宏小区 /基站和微 小区 /基站分别独立调度 UE,这会导致双接入 UE没有足够的上行发射功率 来支持同时上行传输给宏小区 /基站和微小区 /基站。 显然的, 目前 Release-10/ll 的上行功率控制机制不能解决当前的问题。 在本申请后文中 将用户设备接入的小区 /基站分为主小区 /基站和辅小区 /基站。显然的,在采 用载波聚合技术后, 对于用户来说各个基站包含了多个小区, 故主基站和 辅基站可称为主小区群和辅小区群。 发明内容
针对以上问题, 本发明的主要目的是提供针对双接入场景下的用户上 行功率控制的解决方案。根据本发明,可将 UE的配置最大发射功率按照接 入的不同小区 /基站配置为主小区配置最小保证发射功率 P MeNB和辅小区 配置最小保证发射功率 P— SeNB以及剩余功率 (如果存在)。 所谓主小区配 置最小保证发射功率和辅小区最小保证发射功率是指用户设备在该小区上 被分配的最小上行发射功率。 这些最小保证发射功率可由网络侧配置, 也 可由 UE侧自行决定。如果由网络侧配置,则主基站可通过回程链路或者通 过 UE来告知辅基站这些参数。 若由 UE侧配置, 则 UE可通过包含这些参 数的新设计的 PHR来告知主基站和辅基站。 这些最小保证发射功率至少需 要满足以下任一条件: P— MeNB >= 0, P SeNB >= 0或 P— MeNB + P— SeNB <= ?0^或( δ *P— MeNB + (1 δ )* P SeNB )/ PCmax <= 100%或 P— MeNB <= PCMAX,M或 P— SeNB <= PCMAX,S
根据本发明的一个方面, 提供了一种上行功率控制方法, 包括: 主基 站确定用户设备在主小区的配置最小保证发射功率 P— MeNB和在辅小区的 配置最小保证发射功率 P— SeNB; 主基站向与辅小区相对应的辅基站通知 P— SeNB和 /或 P— MeNB ;以及向所述用户设备通知 P— MeNB和 /或 P— SeNB。
在一个实施例中, 主基站通过预留功率指示消息向与辅小区相对应的 辅基站通知 P— SeNB和 /或 P— MeNB。
在一个实施例中, 主基站通过无线电资源控制 RRC信令向所述用户设 备通知 P— MeNB和 /或 P— SeNB。
在一个实施例中,主基站通过 RRC信令向所述用户设备通知 P— MeNB, 辅基站通过 RRC信令向所述用户设备通知 P— SeNB。
在一个实施例中, 该方法还包括: 主基站和辅基站分别接收用户设备 发送的功率余量报告 PHR, 并基于 PHR计算用户设备的实际发送功率。
根据本发明的另一个方面, 提供了一种上行功率控制方法, 包括: 主 基站确定用户设备在主小区的配置最小保证发射功率 P— MeNB和 /或在辅小 区的配置最小保证发射功率 P— SeNB;以及主基站通过无线电资源控制 RRC 信令向所述用户设备通知 P— MeNB和 /或 P— SeNB。 用户设备通过增强功率 余量报告 aPHR向与辅小区相对应的辅基站通知 P— SeNB。
在一个实施例中,用户设备通过增强功率余量报告 aPHR向与辅小区相 对应的辅基站通知 P— SeNB包括:判断是否满足 aPHR的触发条件;如果满 足 aPHR的触发条件, 则发送 aPHR。 在一个实施例中, 所述触发条件包括以下至少一项: 用户设备激活双 接入状态;载波的数据信道的功率余量报告被触发;接收到基站发送的 RRC 信令; 用户设备的默认配置为报告所述增强功率余量报告; 所配置的用于 触发所述功率余量报告的上报的周期性定时器超时; 所配置的用于禁止所 述功率余量报告的发送的禁止报告定时器超时, 并且测量得到的路径损耗 的变化超过阀值。
在一个实施例中, 该方法还包括: 主基站接收用户设备发送的功率余 量报告 PHR, 并基于 PHR计算用户设备在主小区的实际发送功率; 以及辅 基站接收用户设备发送的增强功率余量报告 aPHR, 并基于 aPHR计算用户 设备在辅小区的实际发送功率。
根据本发明的另一个方面, 提供了一种上行功率控制方法, 包括: 用 户设备确定其在主小区的配置最小保证发射功率 P— MeNB和辅小区的配置 最小保证发射功率 P— SeNB; 以及用户设备通过增强功率余量报告 aPHR分 别向主基站和辅基站通知 P— MeNB和 P— SeNB。
在一个实施例中,用户设备通过增强功率余量报告 aPHR分别向主基站 和辅基站通知 P— MeNB和 P— SeNB, 包括: 判断是否满足 aPHR和 /或 PHR 的触发条件; 如果满足 aPHR和 /或 PHR的触发条件, 则发送 aPHR和 /或 在一个实施例中, 所述触发条件包括以下至少一项: 用户设备激活双 接入状态;载波的数据信道的功率余量报告被触发;接收到基站发送的 RRC 信令; 用户设备的默认配置为报告所述增强功率余量报告; 所配置的用于 触发所述功率余量报告的上报的周期性定时器超时; 所配置的用于禁止所 述功率余量报告的发送的禁止报告定时器超时, 并且测量得到的路径损耗 的变化超过阀值。
在一个实施例中, 该方法还包括: 主基站和辅基站接收用户设备发送 的增强功率余量报告 aPHR, 并基于 aPHR计算用户设备的实际发送功率。
根据本发明的另一个方面, 提供了一种上行功率控制方法, 包括: 用 户设备获得其在主小区的配置最小保证发射功率 P— MeNB和辅小区的配置 最小保证发射功率 P SeNB;以及如果满足功率缩减条件,则执行功率缩减。 在一个实施例中, 所述功率缩减条件包括: 任一个基站调度用户设备 的功率大于该基站的配置最小保证发射功率, 并且用户设备的总发射功率 大于总的配置最大发射功率。
若满足该功率缩减条件, 则用户设备优先缩减其驻留小区群上发射功 率超过配置最小保证发射功率加上剩余功率 (P_MeNB+P— remaining
(P_SeNB+P_remaining))。 在每个驻留小区群上功率缩减的方式如
Release- 10/11标准规范中所述。
在一个实施例中, 所述功率缩减条件包括: 所有基站调度用户设备的 功率均大于该基站的配置最小保证发射功率, 并且用户设备的总发射功率 大于总的配置最大发射功率。 若满足该功率缩减条件, 则用户设备缩减各 个小区群上的发射功率。 在每一个驻留小区群上功率缩减的方式如
Release- 10/11标准规范中所述。
根据本发明的另一个方面, 提供了一种上行功率的分配方法, 用于为 用户设备在每一个接入的基站上的上行功率进行分配, 所述方法包括: 在 接入的主基站或辅基站上, 分配功率达到 P— MeNB或 P— SeNB。 具体地, 当用户被调度时, 对应于接入的每一个基站, 首先分配功率各自达到 P— SeNB或 P— MeNB而不需要遵守功率分配优先级原则, 用户设备的发射 功率为用户设备当次调度所需的发射功率和用户设备被配置的最小保证发 射功率中较小的一个, 用户设备当次调度所需的发射功率由上行允许和 TPC命令所决定; 以及分配剩余功率。
在一个实施例中, 对于剩余功率的分配, 用户设备在接入的任意基站 上先被调度, 则可优先使用剩余功率。 根据本发明的另一个方面, 提供了一种基站, 包括: 确定单元, 被配 置为确定用户设备在主小区的配置最小保证发射功率 P— MeNB和在辅小区 的配置最小保证发射功率 P— SeNB; 以及发送单元, 被配置为发送所确定的 P— MeNB禾口 P— SeNB。
在一个实施例中, 所述发送单元被配置为: 向与辅小区相对应的辅基 站通知 P SeNB, 并且向所述用户设备通知 P MeNB和 P SeNB。 在一个实施例中, 所述发送单元被配置为: 通过预留功率指示消息向 与辅小区相对应的辅基站通知 P— SeNB, 并通过无线电资源控制 RRC信令 向所述用户设备通知 P— MeNB和 P— SeNB。
在一个实施例中, 该基站还包括: 接收单元, 被配置为接收用户设备 发送的功率余量报告 PHR, 并基于 PHR计算用户设备的实际发送功率。
根据本发明的另一个方面, 提供了一种用户设备, 包括: 确定单元, 被配置为确定所述用户设备在主小区的配置最小保证发射功率 P— MeNB和 辅小区的配置最小保证发射功率 P— SeNB; 以及发送单元, 被配置为通过增 强功率余量报告 aPHR分别向主基站和辅基站通知 P— MeNB和 P— SeNB。
在一个实施例中,所述发送单元被配置为:判断是否满足 aPHR的触发 条件; 以及如果满足 aPHR的触发条件, 则发送 aPHR。
在一个实施例中, 所述触发条件包括以下至少一项: 用户设备激活双 接入状态;载波的数据信道的功率余量报告被触发;接收到基站发送的 RRC 信令; 用户设备的默认配置为报告所述增强功率余量报告; 所配置的用于 触发所述功率余量报告的上报的周期性定时器超时; 所配置的用于禁止所 述功率余量报告的发送的禁止报告定时器超时, 并且测量得到的路径损耗 的变化超过阀值。
根据本发明的另一个方面, 提供了一种用户设备, 包括: 获取单元, 被配置为获取所述用户设备在主小区的配置最小保证发射功率 P— MeNB和 辅小区的配置最小保证发射功率 P— SeNB; 以及功率缩减单元, 被配置为在 满足功率缩减条件的情况下执行功率缩减。
在一个实施例中, 所述功率缩减条件包括: 任一个基站调度用户设备 的功率大于该基站的配置最小保证发射功率, 并且用户设备的总发射功率 大于总的配置最大发射功率。
在一个实施例中, 所述功率缩减条件包括: 所有基站调度用户设备的 功率均大于该基站的配置最小保证发射功率, 并且用户设备的总发射功率 大于总的配置最大发射功率。
采用本发明, 能够提高无线通信系统(例如 LTE-Advanced系统) 中的 能源利用率, 并改善频谱效率。 附图说明
通过下文结合附图的详细描述, 本发明的上述和其它特征将会变得更 加明显, 其中:
图 1为根据本发明一个实施例的上行功率控制方法的流程图; 图 2为根据本发明另一个实施例的上行功率控制方法的流程图; 图 3为根据本发明实施例的增强功率余量报告的发送方法的流程图; 图 4为根据本发明实施例的 X2-AP过程的流程图;
图 5a为根据本发明实施例的一种增强功率余量报告的 MAC CE结构 图;
图 5b为根据本发明实施例的另一种增强功率余量报告的 MAC CE结构 图;
图 5c为根据本发明实施例的又一种增强功率余量报告的 MAC CE结构 图;
图 6为根据本发明另一个实施例的上行功率控制方法的流程图; 图 7为根据本发明另一个实施例的上行功率控制方法的流程图; 图 8为根据本发明另一个实施例的基站的框图;
图 9为根据本发明另一个实施例的用户设备的框图; 以及
图 10为根据本发明另一个实施例的用户设备的框图。 具体实施方式
以下将结合附图和具体实施例,对本发明所提出的针对双接入 UE的上 行功率控制的方法、 基站和用户设备 (UE) 进行详细阐述。 应当注意, 本 发明不应局限于下文所述的具体实施例。 另外, 为了简便起见, 省略了对 与本发明没有直接关联的公知技术的详细描述, 以防止对本发明的理解造 成混淆。
下文以 LTE移动通信系统及其后续的演进版本作为示例应用环境, 具 体描述了根据本发明的多个实施例。 然而, 需要指出的是, 本发明不限于 以下实施例, 而是可适用于更多其它的无线通信系统, 例如今后的 5G蜂窝 通信系统。 首先介绍用户设备在各小区 /基站的配置最大发射功率的定义。 在
Release-12中, 当用户设备驻留在不止一个小区 /基站上时 (例如两个小区 / 基站), 用户设备在每一个成员载波上都配置了一个配置最大发射功率 PCMAX;C而用户设备在其驻留的每一个小区 /基站上分别被 RRC信令配置了 配置最大发射功率, 此处记为 PCMAX,M和 PCMAX,S。显然, 这两个参数的取值 范围均为 -29dBm至 23dBm。需要选择 PCMAX,M和 PCMAX,S中较大的一个参数 作为总的配置最大发射功率 PCMAX, 即 PcMAx = max(PCMAx,M, PCMAX,s)。然后 用户设备将总的配置最大发射功率 PCMAX按照接入不同的小区分为主基站 小区总的配置最大发射功率 PM,CMAX和 /或辅基站小区总的配置最大发射功 率 PS,CMAX。 此处, 需说明一点, 对于上文中提到的双接入用户接入的每一 个基站会被配置一个在该基站所属小区群上的上行最大发射功率, 按照在 之后提到的功率缩减示例一 (见 [1] ) 和示例二 (见 [2] ) 可推断出用户除了 配置的最大发射功率还可以使用剩余的发射功率, 即实际发射功率可大于 配置最大发射功率。 因此配置的最大发射功率只代表了一个配置的值, 并 不表示用户的实际发射功率不能超过这个配置的最大发射功率。 因此在本 文之后的内容中将名词 "最大发射功率 PX,CMAX"改为 "最小保证发射功率 P— XeNB", 其中 X可以是 M或S。 其中, 至少需要满足以下任一条件: P MeNB >= 0, P— SeNB >= 0禾口 /或
^M.CMAX + ^S.CMAK ― ^CMAX P MeNB + P SeNB <= PCmax禾口 /或 ( δ *P— MeNB + (1- δ )* P SeNB )/ Pc 100%
PM,CMAX ^C X 禾口 /或 P MeNB <= ΡΟΜΑΧ,Μ
Ps. cMAii≤ PCMHS禾口 /或 P SeNB <= PCMAX,S
所以, P— MeNB和 P— SeNB的取值范围可以为 -40dBm到 23dBm, 且两 者之和应小于用户设备总的配置最大发射功率。 S为一比例系数, 其值为 大于 0小于 1的数字。
对于一个用户设备, 其在每一个接入的基站上的上行功率分配方法可 由以下方法决定:
( 1 ) 在接入的主基站或辅基站上, 用户功率分配可达到 P— MeNB 或 P— SeNB。 具体地, 当用户被调度时, 对应于接入的每一个基站用户首先分 配功率各自达到 P— SeNB或 P— MeNB, 此时不需要遵守功率分配优先级原 则。 因此, 此时用户的发射功率为用户当次调度所需的发射功率 (此功率 由上行允许和 TPC命令所决定) 和用户被配置的最小保证发射功率中较小 的那个值。
(2) 分配剩余的功率。
对于剩余功率的分配, 用户在接入的任意基站上先被调度, 则可优先 使用剩余功率。
图 1 为根据本发明一个实施例的上行功率控制方法的流程图。 在本实 施例中, LTE网络中的主基站配置用户设备在各个小区的配置最小保证发 射功率, 并通过回程链路告知辅基站。 如图 1所示, 方法 10在歩骤 S100 处开始。
在歩骤 S110, 主基站确定用户设备在主小区的配置最小保证发射功率 P_MeNB和在辅小区的配置最小保证发射功率 P— SeNB。
在歩骤 S120 , 主基站向与辅小区相对应的辅基站通知 P— SeNB。 例如, 主基站可以通过 X2接口向辅基站通知 P— SeNB的取值。
当用户设备处于双接入状态时, 发起 X2-AP过程。 当用户设备不处于 双接入状态时, 用户设备所接入的基站如 Release-10/ll—样正常调度此用 户设备。 下面, 详细描述 X2-AP过程如下:
1.综述 (General)
首先, 这个 X2-AP的功能可称之为预留功率指示消息。 如图 4所示, 预留功率指示消息过程由主基站发起, 通过 X2-AP所包含的信息告知辅基 站相关的用户设备在该基站上的配置最大发射功率。 这个过程可以使用用 户设备相关的信令。
2.成功的操作 (Successful Operation)
这个过程由主基站发起。 主基站通过发送预留功率消息告知辅基站用 户设备的预留功率值。 辅基站收到预留功率消息后, 会使用相应的预留功 率值来调度相关的用户设备。
3.不成功的操作 (Unsuccessful Operation)
本申请中不适用。
4.异常情况 (Abnormal Conditions)
若出现异常情况, 则辅基站忽略此消息。
其中, 此过程中所包含的预留功率指示消息的结构和此消息中所包含 的预留功率信息元素的可以设计如下: 表 1 预留功率指示消息
Figure imgf000013_0001
表中的标识 (如 Presence, Range, Criticality禾口 Assigned Criticality) 的 定义可参见 TS 36.413。
预留功率值为相应小区提供了用户设备的预留功率值, 即 dual connectivity UE在辅基站上的配置最小保证发射功率 P— SeNB的值,用于调 度。 该信息的具体设计例如下表所示。 表 2 预留功率值
信息元素名称 存在状态 范围 信息元素类 语意描述 应用临界 实际应用临界
(IE/Group (Presence) (Range) 型及参考 (Semantic (Criticality) (Assign Name) (IE type and description) criticality) reference)
预留功率值 强制 (M) 整数取值 取值范围是
(Power Reserve (善"23) -40dBm到
Value) (INTEGER 23dBm,步进单
(-40·· -23)) 位 ldB。 由于预留功率指示消息是一个新的 X2-AP, 为此本发明中增加了一种 新的消息类型。 下表是对 TS 36.423 9.2.13中消息类型的一种修改。 其中, 增加了一种新的消息类型, 定义为 " 16 " 预留功率指示。 表 3 消息类型
Figure imgf000014_0001
在歩骤 S130, 主基站向所述用户设备通知 P MeNB和 P SeNB。 该通 知过程可以以若干方式实现。 以下, 列出若干示例加以说明。
示例一: 主基站将用户设备在不同驻留小区上的配置最小保证发射功 率 P— MeNB和 P— SeNB通过 RRC信令告知用户设备。这两个参数用于上行 功率控制, 例如可放置在 IE UplinkPowerDedicated中:
--ASN1START
P-MeNB INTEGER ( -4 0 . . P_MeNB ) OPTIONAL , ― Need OR
P-SeNB INTEGER ( -4 0 . . P_SeNB ) OPTIONAL , ― Need OR
― ASN1 STOP
其中, P-MeNB和 P-SeNB对应于 P— MeNB和 P— SeNB ,取值范围为 -40dBm 至 23dBm。
示例二: 主基站和辅基站分别将用户设备在不同驻留小区上的配置最 小保证发射功率 P— MeNB和 P— SeNB通过 RRC信令告知用户设备。这两个 参数用于上行功率控制, 可放置在 IE UplinkPowerDedicated中:
― ASN1 START
P-XeNB INTEGER ( -40. . P_XeNB ) OPTIONAL, ― Need OR
--ASN1STOP
其中, P-XeNB对应于 P— MeNB或 P— SeNB,其取值范围为 -40dBm至 23dBm。
可选地, 方法 10可以包括歩骤 S140。 在 S140 , 主基站接收用户设备 发送的功率余量报告 PHR, 并基于 PHR计算用户设备的实际发送功率。 例 如, 主基站和辅基站收到用户设备发送的功率余量报告 (PHR:)。 这样, 主基 站可以计算出用户设备在各个驻留小区上的实际发射功率。 而主基站或辅 基站以 P— MeNB或 P— SeNB代替 PCMAX作为各个驻留小区上配置最大发射 功率。 这样, 基站可以通过驻留小区上的实际发射功率和配置最小保证发 射功率准确地调度用户设备。
最后, 方法 10在歩骤 S150结束。 图 2为根据本发明另一个实施例的上行功率控制方法的流程图。 在本 实施例中, 主基站配置用户设备在各驻留小区配置最小保证发射功率, 并 通过用户设备告知辅基站。 如图 2所示, 方法 20在歩骤 S200处开始。
在歩骤 S210 , 主基站确定用户设备在主小区的配置最小保证发射功率 P— MeNB和在辅小区的配置最小保证发射功率 P— SeNB。
在歩骤 S220 ,主基站通过无线电资源控制 RRC信令向所述用户设备通 知 P— MeNB和 P— SeNB。 例如, 主基站可以将用户设备在不同驻留小区上 的配置最小保证发射功率 P— MeNB和 P— SeNB通过 RRC信令告知用户设 备。 此时, 此 RRC信令与前文中所述的 RRC信令配置示例一相同。 这两 个参数用于上行功率控制, 可放置在 IE UplinkPowerDedicated中:
--ASN1 START
P-MeNB INTEGER ( -4 0 . . P_MeNB ) OPTIONAL , ― Need OR
P-SeNB INTEGER ( -4 0 . . P_SeNB ) OPTIONAL , ― Need OR
― ASN1 STOP
其中, P-M-cmax和 P-S-cmax对应于 P— MeNB和 P— SeNB , 取值范围 为 -40dBm至 23dBm。
方法 20包括歩骤 S230。在 S230 ,用户设备通过增强功率余量报告 aPHR 向与辅小区相对应的辅基站通知 P— SeNB。 下面, 结合图 3详细阐述 aPHR 的发送过程。
触发条件:
当 Release-12用户开始进入双接入 (dual connectivity)状态, 即从单接入 变为双接入, 这里我们称之为激活双接入 (dual connectivity)状态。 显然的, 此时主基站配置了该用户设备相应的配置最小保证传输功率, 用户设备的 增强功率余量报告触发(310)。当用户处于双接入 (dual connectivity)状态时, 确定满足 Release-10/l l中的 PHR触发条件, 则触发并发送 aPHR ( 320)。 所述触发条件包括下述条件中的至少一个: 所述载波的数据信道的功率余 量报告被触发; 接收到基站发送的无限资源控制 RRC信令; 用户设备的默 认配置为报告所述增强功率余量报告; 配置的用于触发所述功率余量报告 的上报的周期性定时器超时; 配置的禁止报告定时器超时, 所述禁止报告 顶上去用于在所述禁止报告定时器计时期间禁止所述功率余量报告的上 报, 并且测量得到的路径损耗上变化超过阀值; 用户设备已执行了不止一 个所配置的 TPC命令; 用户设备被配置了新的 Scell。
在 330, 在当前工作方式下, 用户设备发射 aPHR取代 Release-10/l l 中的 PHR。 所谓 aPHR, 如图 5a所示。 第一个字节的最后一比特置 " 1 ", 此比特可称为指示信息, 表示此功率余量报告包含了用户设备在辅基站上 的配置最小保证发射功率 P— SeNB 或配置最小保证发射功率比率 δ或在该 小区上总的功率余量。 配置最小保证发射功率 P— SeNB 按预定顺序封装于 功率余量报告中所包含的 n个比特中。 P SeNB的在 aPHR中的表示方式可 分为: 示例一: 参照 PHR中 PCMAX,e的映射方式, P XeNB可映射为下表: 表 4P c,CMAX的映射
Figure imgf000017_0001
其中 X可以是 M或 S, 指代宏基站或辅基站。 用户设备通过主基站的 RRC信令获知 P SeNB的值。 示例二: 如图 5b所示, 因为兼顾后向兼容性, 用户设备存在一个总的 配置最大发射功率 PCMAX。 为此, 设计一个参数 S作为比例系数, 使得
P_XeNB = S*PCMAX。 其中, 其中 X可以是 M或S。 参数 δ由 y个比特组 成, 其中 y为一自然数。 具体的,在一个例子中, 参数 δ的取值可以采用 {0, 0.4,0.5,0.6,0.7,0.8,0.9, 1}, 此时参数 δ为三比特。 在另一个例子中, 参数 δ也可以采用百分比 INTEGER l— lOO), 其中 1代表了最小的百分比, 100 代表最大的百分比。 此时参数 δ为七比特。 图中各个参数的详细说明可参 见 TS 36.3216.1.3.6a。 示例三: 如图 5c所示, 用户设备已知道其在辅基站小区的配置最小保 证发射功率, 同时用户设备已知道其在辅基站小区的实际发射功率。 因此, 在用户设备处可计算出辅基站小区的各成员载波上总的功率余量。 不同于 前面的实施例, 此处在功率余量报告中加入总的功率余量构成增强型功率 余量报告 (aPHR)。 显然, 总的功率余量值的映射方式与功率余量是一样的。
可选地, 方法 20可以包括歩骤 S240。 在 S240 , 主基站接收用户设备 发送的功率余量报告 PHR,并基于 PHR计算用户设备在主小区的实际发送 功率; 以及辅基站接收用户设备发送的增强功率余量报告 aPHR, 并基于 aPHR计算用户设备在辅小区的实际发送功率。 主基站以 P— MeNB 代替
PCMAX作为驻留小区上配置最小保证发射功率。这样, 主基站通过驻留小区 上的实际发射功率和配置最小保证发射功率准确地调度用户设备。 同样地, 辅基站以 P— SeNB代替 PCMAX作为驻留小区上配置最小保证发射功率。这样, 辅基站通过驻留小区上的实际发射功率和配置最小保证发射功率准确地调 度用户设备。
最后, 方法 20在歩骤 S250处结束。 图 6 为根据本发明另一个实施例的上行功率控制方法的流程图。 在本 实施例中, 用户设备确定配置最大发射功率 P_MeNB和 P— SeNB , 并通过 aPHR告知主基站和辅基站。 如图 6所示, 方法 60在歩骤 S600处开始。
为了兼顾后向兼容性, 此处主基站和辅基站如 Release-10/l l 样通过 RRC信令分别配置用户设备在主小区和辅小区上的配置最大发射功率, 此 处记为 PCMAX,M和 PCMAX,S。 显然, 这两个参数的取值范围均为 -29dBm至 23dBm。 选择 PCMAX,M和 PCMAX,S中较大的一个参数作为总的配置最大发射 功率 PcMAX' §卩 PcMAX = max (ΡθΜΑΧ,Μ, PcMAX,S)。
在歩骤 S610 , 用户设备确定其在主小区的配置最小保证发射功率 P— MeNB和 /或辅小区的配置最小保证发射功率 P— SeNB。 至少需要满足以 下任一条件:
P— MeNB >= 0, P— SeNB >= 0
P— MeNB + P— SeNB <= Pc丽或( δ *P— MeNB + (1 δ )* P SeNB )/ Pc丽 <= 100%
P— MeNB <= PCMAX,M
P_SeNB <= PCMAX;S 在歩骤 S620, 用户设备通过增强功率余量报告 aPHR分别向主基站和 辅基站通知 P— MeNB和 P— SeNB。该 aPHR的发送过程已经在上文结合图 3 进行了详细阐述, 因此这里不再重复说明。
在歩骤 S630, 主基站和辅基站接收用户设备发送的增强功率余量报告 aPHR, 并基于 aPHR计算用户设备的实际发送功率。 各基站以 P— MeNB或 P— SeNB代替 PCMAX作为驻留小区上配置最大发射功率。 这样, 各基站可以 通过驻留小区上的实际发射功率和配置最大发射功率准确地调度用户设 备。
最后, 方法 60在歩骤 S640处结束。 图 7为根据本发明另一个实施例的上行功率控制方法的流程图。如图 7 所示, 方法 70在歩骤 S700处开始。
在歩骤 S710 , 用户设备获得其在主小区的配置最小保证发射功率 P— MeNB和辅小区的配置最小保证发射功率 P_SeNB。
在歩骤 S720, 判断是否满足功率缩减条件。 如果满足, 则执行功率缩 减 (power scaling:)。 例如, 功率缩减条件可以包括: 任一个基站调度用户设 备的功率大于该用户设备在该基站的配置最小保证发射功率, 并且用户设 备的总发射功率大于该用户设备总的配置最大发射功率。 备选地, 功率缩 减条件可以包括: 所有基站调度用户设备的功率均大于该用户设备在该基 站的配置最小保证发射功率, 并且用户设备的总发射功率大于该用户设备 总的配置最大发射功率。
例如, 用户设备可以通过 RRC信令获得其在各个驻留小区的配置最小 保证发射功率 P— MeNB和 P— SeNB。 备选地, 用户设备自身可以确定其在 各个驻留小区的配置最小保证发射功率 P— MeNB和 P— SeNB。 然后, 用户 设备可以按照 Release-10/ll标准规范中的方式工作。 此时, 用户设备使用 P— MeNB和 P— SeNB代替 PCMAX作为该用户设备在该驻留小区上配置最大发 射功率, 并以此作为功率缩减的基础。 例如:
示例一: 当任一基站调度用户设备的功率大于该基站配置最小保证发 射功率, 而用户设备总的发射功率小于总的配置最大发射功率, 即
^M.PUCCH + '^M, PUSCH ^M.CMAX ^^^PUCCH + ^S,PUSCH ^SXMAX , 而同时 Pp CCH + PpUSCH ≤ PcMAX 0 此时不需要做功率缩减。 示例二: 当任一基站调度用户设备的功率大于该基站配置最小保证发 射功率, 同时用户设备总的发射功率大于总的配置最大发射功率, 即
^M,PUCCH + ^M. PUSCH 》 ^M,CMAK ^^^S.PUCCH + ^S.PUSCH > ^S.CMAX , 而同时
PPUCCH + Pp cH > · Ρ Απ。 此时需要做功率缩减, 用户设备优先缩减其驻 留小区上发射功率超过配置最小保证发射功率加上剩余功率
(P MeNB+P remaining (P SeNB+P remaining))。 功率缩减的方式如 Release- 10/11标准规范中所述。
示例三: 当所有基站调度用户设备的功率均大于该基站配置最大发射 功率, 同时用户设备总的发射功率大于总的配置最大发射功率。 即
^M.PUCCH + PM'PUSCH > ^M.CMAX ^-^S.PUCCH + ^S.PUSCH > ^S.CMA , 同 时 PpUCCH + PpUSCH > PcMAX。 此时需要做功率缩减, 用户设备同时缩减各个 驻留小区上发射功率。 功率缩减例如可按照 Release-10/l l标准规范中所述 来进行。
最后, 方法 70在歩骤 S730结束。 图 8为根据本发明另一个实施例的基站的框图。 如图 8所示, 基站 80 包括确定单元 810和发送单元 820。 备选地, 基站 80还包括接收单元 830。 图 8所示的基站 80可以用于执行图 1-2中所示的方法。
确定单元 810被配置为确定用户设备在主小区的配置最小保证发射功 率 P— MeNB和在辅小区的配置最小保证发射功率 P— SeNB。
发送单元 820被配置为发送所确定的 P— MeNB和 P— SeNB。 例如, 发 送单元 820可以向与辅小区相对应的辅基站通知 P— SeNB ,并且向所述用户 设备通知 P— MeNB和 P— SeNB。 优选地, 发送单元 820通过预留功率指示 消息向与辅小区相对应的辅基站通知 P— SeNB,并通过无线电资源控制 RRC 信令向所述用户设备通知 P— MeNB和 P— SeNB。
接收单元 830被配置为接收用户设备发送的功率余量报告 PHR和 /或增 强功率余量报告 aPHR, 并基于 PHR和 /或 aPHR计算用户设备的实际发送 功率和剩余可调度功率。 图 9为根据本发明另一个实施例的用户设备 90的框图。 如图 9所示, 用户设备 90包括确定单元 910和发送单元 920。图 9所示的用户设备 90可 以用于执行图 6中所示的方法。
确定单元 910被配置为确定所述用户设备在主小区的配置最小保证发 射功率 P— MeNB和辅小区的配置最小保证发射功率 P— SeNB。
发送单元 920被配置为通过增强功率余量报告 aPHR分别向主基站和辅 基站通知 P— MeNB和 P— SeNB。 优选地, 发送单元 920首先判断是否满足 aPHR和 /或 PHR的触发条件。 如果满足 aPHR和 /或 PHR的触发条件, 则 发送 aPHR和 /或 PHR。 触发条件可以包括以下至少一项: 用户设备激活双 接入状态;载波的数据信道的功率余量报告被触发;接收到基站发送的 RRC 信令; 用户设备的默认配置为报告所述增强功率余量报告; 所配置的用于 触发所述功率余量报告的上报的周期性定时器超时; 所配置的用于禁止所 述功率余量报告的发送的禁止报告定时器超时, 并且测量得到的路径损耗 的变化超过阀值。 图 10为根据本发明另一个实施例的用户设备 100的框图。 如图 10所 示, 用户设备 100包括获取单元 110和功率缩减单元 120。 图 10所示的用 户设备 100可以用于执行图 7中所示的方法。
获取单元 110被配置为获取所述用户设备在主小区的配置最小保证发 射功率 P— MeNB和辅小区的配置最小保证发射功率 P— SeNB。
功率缩减单元 120被配置为在满足功率缩减条件的情况下执行功率缩 减。 例如, 功率缩减条件可以包括: 任一个基站调度用户设备的功率大于 该基站的配置最小保证发射功率, 并且用户设备的总发射功率大于总的配 置最大发射功率。 备选地, 功率缩减条件包括: 所有基站调度用户设备的 功率均大于该基站的配置最小保证发射功率, 并且用户设备的总发射功率 大于总的配置最大发射功率。 本申请提出了几种针对双接入用户设备的上行功率控制方法。 采用本 申请提出的技术方案, 能够提高 LTE支持双接入用户设备的上行资源利用 率并改善频谱 /能量效率。
应该理解, 本发明的上述实施例可以通过软件、 硬件或者软件和硬件 两者的结合来实现。 例如, 上述实施例中的基站和用户设备内部的各种组 件可以通过多种器件来实现, 这些器件包括但不限于: 模拟电路器件、 数 字电路器件、 数字信号处理 (DSP) 电路、 可编程处理器、 专用集成电路 (ASIC), 现场可编程门阵列 (FPGA)、 可编程逻辑器件 (CPLD), 等等。
在本申请中, "基站"是指具有较大发射功率和较广覆盖面积的移动通 信数据和控制交换中心, 包括资源分配调度、 数据接收发送等功能。 "用户 设备"是指用户移动终端, 例如包括移动电话、 笔记本等可以与基站或者 辅基站进行无线通信的终端设备。
此外, 这里所公开的本发明的实施例可以在计算机程序产品上实现。 更具体地, 该计算机程序产品是如下的一种产品: 具有计算机可读介质, 计算机可读介质上编码有计算机程序逻辑, 当在计算设备上执行时, 该计 算机程序逻辑提供相关的操作以实现本发明的上述技术方案。 当在计算系 统的至少一个处理器上执行时, 计算机程序逻辑使得处理器执行本发明实 施例所述的操作(方法)。 本发明的这种设置典型地提供为设置或编码在例 如光介质(例如 CD-ROM)、 软盘或硬盘等的计算机可读介质上的软件、代 码和 /或其他数据结构、 或者诸如一个或多个 ROM或 RAM或 PROM芯片 上的固件或微代码的其他介质、 或一个或多个模块中的可下载的软件图像、 共享数据库等。 软件或固件或这种配置可安装在计算设备上, 以使得计算 设备中的一个或多个处理器执行本发明实施例所描述的技术方案。
尽管以上已经结合本发明的优选实施例示出了本发明, 但是本领域的 技术人员将会理解, 在不脱离本发明的精神和范围的情况下, 可以对本发 明进行各种修改、 替换和改变。 因此, 本发明不应由上述实施例来限定, 而应由所附权利要求及其等价物来限定。

Claims

权 利 要 求
1. 一种上行功率控制方法, 包括:
主基站确定用户设备在主小区和 /或主小区群的配置最小保证发射功率
P— MeNB和在辅小区和 /或辅小区群的配置最小保证发射功率 P— SeNB; 主基站向与辅小区和 /或辅小区群相对应的辅基站通知 P— SeNB; 以及 向所述用户设备通知 P— MeNB和 /或 P— Se B。
2. 根据权利要求 1所述的方法, 其中, 主基站通过回程信令预留功率 指示消息向与辅小区和 /或辅小区群相对应的辅基站通知 P—SeNB。
3. 根据权利要求 2所述的方法, 其中, 预留功率指示消息包括 X2-AP 消息。
4. 根据权利要求 1所述的方法,其中,主基站通过无线电资源控制 RRC 信令向所述用户设备通知 P— MeNB和 /或 P— SeNB。
5. 根据权利要求 4所述的方法, 其中, RRC信令包括两个参数, 所述 两个参数分别作为用户设备在主小区和 /或主小区群和辅小区和 /或辅小区 群上的配置最小保证发射功率。
6. 根据权利要求 1所述的方法, 其中, 主基站通过 RRC信令向所述用 户设备通知 P— MeNB,辅基站通过 RRC信令向所述用户设备通知 P— SeNB。
7. 根据权利要求 6所述的方法, 其中, RRC信令包括参数, 所述参数 作为用户设备在相应小区上的配置最小保证发射功率。
8. 根据权利要求 1所述的方法, 还包括:
主基站接收用户设备发送的功率余量报告 PHR,并基于 PHR计算用户 设备的实际发送功率。
9. 一种上行功率控制方法, 包括:
主基站确定用户设备在主小区和 /或主小区群的配置最小保证发射功率 P— MeNB和 /或在辅小区和 /或辅小区群的配置最小保证发射功率 P— SeNB; 主基站通过无线电资源控制 RRC信令向所述用户设备通知 P— MeNB和 /或 P— SeNB; 以及
用户设备通过功率余量报告 aPHR向与辅小区和 /或辅小区群相对应的 辅基站通知 P MeNB。
10. 根据权利要求 9所述的方法,其中,增强功率余量报告 aPHR包括: 用户设备将需要上报的用户设备在辅小区上的配置最小保证发射功率
P— SeNB和 /或上行成员载波特定的 PH及上行成员载波上的配置最大发射功 率 PCMAx,e按照预定顺序封装在同一个 aPHR中, 同时还在所述 aPHR中封 装指示用户上报的是否是 aPHR的指示信息; 以及
所述辅基站在接收到所述 PHR后进行解析,得到所述 PHR中包含的指 示信息以判断该 aPHR中含有的配置最小保证发射功率 P— SeNB。
11. 根据权利要求 9所述的方法,其中,增强功率余量报告 aPHR包括: 用户设备将需要上报的用户设备在辅小区上的总的功率余量值和 /或上 行成员载波特定的 PH及上行成员载波上的配置最大发射功率 PCMAX,e按照 预定顺序封装在同一个 aPHR中,同时还在所述 aPHR中封装指示用户上报 的是否是 aPHR的指示信息; 以及
所述辅基站在接收到所述 PHR后进行解析,得到所述 PHR中包含的指 示信息以判断该 aPHR中含有的总的功率余量值。
12. 根据权利要求 9所述的方法, 其中, 用户设备通过增强功率余量报 告 aPHR向与辅小区相对应的辅基站通知 P— SeNB包括:
判断是否满足 aPHR和 /或 PHR的触发条件;
如果满足 aPHR和 /或 PHR的触发条件, 则发送 aPHR和 /或 PHR。
13. 根据权利要求 12所述的方法, 其中, 所述触发条件包括以下至少 一项: 用户设备激活双接入状态; 载波的数据信道的功率余量报告被触发; 接收到基站发送的 RRC信令; 用户设备的默认配置为报告所述增强功率余 量报告; 所配置的用于触发所述功率余量报告的上报的周期性定时器超时; 所配置的用于禁止所述功率余量报告的发送的禁止报告定时器超时, 并且 测量得到的路径损耗的变化超过阀值; 用户设备已执行了多于一个所配置 的 TPC命令; 用户设备被配置了新的 Scell。
14. 根据权利要求 9所述的方法, 还包括:
主基站接收用户设备发送的功率余量报告 PHR,并基于 PHR计算用户 设备在主小区和 /或主小区群的实际发送功率; 以及
辅基站接收用户设备发送的增强功率余量报告 aPHR, 并基于 aPHR计 算用户设备在辅小区和 /或辅小区群的实际发送功率。
15. 一种上行功率控制方法, 包括: 用户设备确定其在主小区和 /或主小区群的配置最小保证发射功率
P— MeNB和辅小区和 /或辅小区群的配置最小保证发射功率 P— SeNB; 以及 用户设备通过增强功率余量报告 aPHR 分别向主基站和辅基站通知 P— MeNB禾口 P— SeNB。
16. 根据权利要求 15所述的方法, 其中, 增强功率余量报告 aPHR包 括:
用户设备将需要上报的用户设备在主小区和 /或主小区群和 /或辅小区 和 /或辅小区群上的配置最小保证发射功率 P— MeNB和 /或 P— SeNB和 /或上 行成员载波特定的 PH及上行成员载波上配置最大发射功率 PCMAX,e按照预 定顺序封装在同一个 aPHR中,同时还在所述 aPHR中封装指示用户上报的 是否是 aPHR的指示信息; 以及
所述辅基站在接收到所述 PHR后进行解析,得到所述 PHR中包含的指 示信息以判断该 aPHR 中含有的配置最小保证发射功率 P— MeNB 和 /或 P— SeNB。
17. 根据权利要求 15所述的方法, 其中, 增强功率余量报告 aPHR包 括:
用户设备将需要上报的用户设备在该小区和 /或小区群上的配置最小保 证发射功率的比率 δ和 /或上行成员载波特定的 ΡΗ及上行成员载波上配置 最大发射功率 PCMAX,e按照预定顺序封装在同一个 aPHR中, 同时还在所述 aPHR中封装指示用户上报的是否是 aPHR的指示信息; 以及
所述基站在接收到所述 PHR后进行解析,得到所述 PHR中包含的指示 信息以判断该 aPHR中含有的配置最小保证发射功率的比率 δ 。
18. 根据权利要求 15所述的方法, 其中, 增强功率余量报告 aPHR包 括:
用户设备将需要上报的用户设备在该小区和 /或小区群上的总的功率余 量和 /或上行成员载波特定的 PH 及上行成员载波上配置最大发射功率 PCMAX,e按照预定顺序封装在同一 aPHR中,同时还在所述 aPHR中封装指示 用户上报的是否是 aPHR的指示信息; 以及
所述基站在接收到所述 PHR后进行解析,得到所述 PHR中包含的指示 信息以判断该 aPHR中含有的总的功率余量。
19. 根据权利要求 15所述的方法, 其中, 用户设备通过增强功率余量 报告 aPHR分别向主基站和辅基站通知 P— MeNB和 P— SeNB包括: 判断是否满足 aPHR和 /或 PHR的触发条件;
如果满足 aPHR和 /或 PHR的触发条件, 则发送 aPHR和 /或 PHR。
20. 根据权利要求 19所述的方法, 其中, 所述触发条件包括以下至少 一项: 用户设备激活双接入状态; 载波的数据信道的功率余量报告被触发; 接收到基站发送的 RRC信令; 用户设备的默认配置为报告所述增强功率余 量报告; 所配置的用于触发所述功率余量报告的上报的周期性定时器超时; 所配置的用于禁止所述功率余量报告的发送的禁止报告定时器超时, 并且 测量得到的路径损耗的变化超过阀值; 用户设备已执行了多于一个所配置 的 TPC命令; 用户设备被配置了新的 Scell。
21. 根据权利要求 15所述的方法, 还包括:
主基站和辅基站接收用户设备发送的增强功率余量报告 aPHR,并基于 aPHR计算用户设备的实际发送功率。
22. 一种上行功率控制方法, 包括:
用户设备获得其在主小区和 /或主小区群的配置最小保证发射功率 P— MeNB和辅小区和 /或辅小区群的配置最小保证发射功率 P— SeNB; 以及 如果满足功率缩减条件, 则执行功率缩减。
23. 根据权利要求 22所述的方法, 其中, 所述功率缩减条件包括: 任 一个基站调度用户设备的功率大于该基站的配置最小保证发射功率, 并且 用户设备的总发射功率大于总的配置最大发射功率。
24. 根据权利要求 23所述的方法, 其中, 用户设备优先针对被调度功 率超过配置最小保证发射功率加上剩余功率的小区和 /或小区群执行功率缩 减。
25. 根据权利要求 22所述的方法, 其中, 所述功率缩减条件包括: 所 有基站调度用户设备的功率均大于该基站的配置最小保证发射功率, 并且 用户设备的总发射功率大于总的配置最大发射功率。
26. 根据权利要求 25所述的方法, 其中, 用户设备针对被调度功率超 过配置最小保证发射功率的小区和 /或小区群执行功率缩减。
27. 一种基站, 包括:
确定单元, 被配置为确定用户设备在主小区和 /或主小区群的配置最小 保证发射功率 P MeNB 和 /或在辅小区和 /或辅小区群的配置最小保证发射 功率 P— SeNB; 以及
发送单元, 被配置为发送所确定的 P— Me B和 /或 P— SeNB。
28. 根据权利要求 27所述的基站, 其中, 所述发送单元被配置为: 向 与辅小区和 /或辅小区群相对应的辅基站通知 P— SeNB, 并且向所述用户设 备通知 P— MeNB和 /或 P— SeNB。
29. 根据权利要求 28所述的基站, 其中, 所述发送单元被配置为: 通 过回程信令预留功率指示消息向与辅小区和 /或辅小区群相对应的辅基站通 知 P— SeNB,并通过无线电资源控制 RRC信令向所述用户设备通知 P— MeNB 和 /或 P— SeNB。
30. 根据权利要求 27所述的基站, 还包括:
接收单元, 被配置为接收用户设备发送的增强功率余量报告 aPHR和 / 或功率余量报告 PHR, 并基于 aPHR/PHR计算用户设备的实际发送功率。
31. 一种用户设备, 包括:
确定单元, 被配置为确定所述用户设备在主小区和 /或主小区群的配置 最小保证发射功率 P— MeNB 和 /或辅小区和 /或辅小区群的配置最小保证发 射功率 P— SeNB; 以及
发送单元,被配置为通过增强功率余量报告 aPHR分别向主基站和辅基 站通知 P— MeNB和 P— SeNB。
32. 根据权利要求 31所述的用户设备, 其中, 所述发送单元被配置为: 判断是否满足 aPHR和 /或 PHR的触发条件; 以及
如果满足 aPHR和 /或 PHR的触发条件, 则发送 aPHR和 /或 PHR。
33. 根据权利要求 32所述的用户设备, 其中, 所述触发条件包括以下 至少一项: 用户设备激活双接入状态; 载波的数据信道的功率余量报告被 触发; 接收到基站发送的 RRC信令; 用户设备的默认配置为报告所述增强 功率余量报告; 所配置的用于触发所述功率余量报告的上报的周期性定时 器超时; 所配置的用于禁止所述功率余量报告的发送的禁止报告定时器超 时, 并且测量得到的路径损耗的变化超过阀值; 用户设备已执行了多于一 个所配置的 TPC命令; 用户设备被配置了新的 Scell。
34. —种用户设备, 包括:
获取单元, 被配置为获取所述用户设备在主小区和 /或主小区群的配置 最小保证发射功率 P MeNB 和 /或辅小区和 /或辅小区群的配置最小保证发 射功率 P— SeNB ; 以及
功率缩减单元, 被配置为在满足功率缩减条件的情况下执行功率缩减。
35. 根据权利要求 34所述的用户设备, 其中, 所述功率缩减条件包括: 任一个基站调度用户设备的功率大于该基站的配置最小保证发射功率, 并 且用户设备的总发射功率大于总的配置最大发射功率。
36. 根据权利要求 35所述的用户设备, 其中, 用户设备优先针对被调 度功率超过配置最小保证发射功率加上剩余发射功率的小区和 /或小区群执 行功率缩减。
37. 根据权利要求 34所述的用户设备, 其中, 所述功率缩减条件包括: 所有基站调度用户设备的功率均大于该基站的配置最小保证发射功率, 并 且用户设备的总发射功率大于总的配置最大发射功率。
38. 根据权利要求 37所述的用户设备, 其中, 用户设备针对被调度功 率超过配置最小保证发射功率的小区和 /或小区群执行功率缩减。
39. 根据权利要求 34所述的用户设备, 其中, 对于任一接入的基站, 配置最小保证发射功率 P— MeNB和 /或 P— SeNB
40. 根据权利要求 39 所述的用户设备, 其中, 最小保证发射功率 P MeNB 和 /或 P— SeNB 至少需满足以下任一条件: P— MeNB >= 0, P— SeNB >= 0或 P MeNB + P SeNB <= Pc 或( δ *P— MeNB + (1- δ )* Ρ— SeNB )/ PCmax <= 100%或 P— MeNB <= PCMAX,m或 P— SeNB <= PCMAX,S
41. 一种用户设备的上行功率分配方法,用于为用户设备在每一个接入 的基站上的上行功率进行分配, 所述方法包括:
在接入的主基站或辅基站上, 分配用户功率以达到 P— MeNB 或 P_SeNB;
当用户设备被调度时, 对应于接入的每一个基站, 首先分配功率各自 达到 P— SeNB或 P— MeNB而无需遵守功率分配优先级原则; 其中, 用户设 备的发射功率为用户设备当次调度所需的发射功率和用户设备被配置的最 小保证发射功率中较小的一个, 用户设备当次调度所需的发射功率由上行 允许和 TPC命令来决定; 以及
分配剩余功率。
42. 根据权利要求 41所述的上行功率分配方法, 其中, 分配剩余功率 包括: 将剩余功率优先分配给先调度到的基站。
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