US9270430B2 - Method and apparatus for power headroom reporting - Google Patents

Method and apparatus for power headroom reporting Download PDF

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US9270430B2
US9270430B2 US12/729,263 US72926310A US9270430B2 US 9270430 B2 US9270430 B2 US 9270430B2 US 72926310 A US72926310 A US 72926310A US 9270430 B2 US9270430 B2 US 9270430B2
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phr
uplink carriers
uplink
timer
values
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US20100238863A1 (en
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Yu-Hsuan Guo
Ko-Chiang Lin
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Innovative Sonic Ltd
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Innovative Sonic Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H04L5/0046—Determination of how many bits are transmitted on different sub-channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation
    • H04L5/0082—Timing of allocation at predetermined intervals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation
    • H04L5/0085—Timing of allocation when channel conditions change
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—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
    • H04W52/365—Power headroom reporting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading

Definitions

  • the present invention relates to a method and apparatus for Power Headroom Reporting, and more particularly, to a method and apparatus for performing Power Headroom Reporting to support carrier aggregation in a user equipment (UE) of a wireless communication system.
  • UE user equipment
  • LTE system Long Term Evolution wireless communication system
  • MAC Medium Access Control
  • RLC Radio Link Control
  • a MAC Protocol Data Unit consists of a MAC header, zero or more MAC Service Data Units (SDUs), zero or more MAC control elements, and optionally padding.
  • a MAC PDU header consists of one or more MAC PDU sub-headers, each corresponding to either a MAC SDU, a MAC control element or padding.
  • the MAC PDU sub-headers have the same order as the corresponding MAC SDUs, MAC control elements and padding.
  • MAC control elements transmitted by a UE include a buffer status report (BSR) MAC control element and a power headroom report (PHR) MAC control element.
  • BSR buffer status report
  • PHR power headroom report
  • the BSR MAC control element is generated by a Buffer Status reporting procedure, and is used to provide the serving base station, or called enhanced Node B (eNB), with information about the amount of data in the uplink (UL) buffers of a UE for scheduling of uplink transmission.
  • the PHR MAC control element is generated by a Power Headroom reporting procedure, and is used to provide the serving eNB with information about the difference between the maximum UE transmission (TX) power and an estimated TX power for Uplink Share Channel (UL-SCH).
  • TX maximum UE transmission
  • UL-SCH Uplink Share Channel
  • a PHR is triggered if any of the following events occurs: (1) a timer “prohibitPHR-TIMER” for prohibiting power headroom reporting expires or has expired and a path loss of the UE has changed more than a predetermined value “DL_PathlossChange” since the last power headroom report; and (2) a periodic timer “PeriodicPHR-Timer” expires, in which case the PHR is referred below to as “Periodic PHR”.
  • the UE After the PHR is triggered, if the UE has UL resources allocated for a new transmission for this TTI, the UE obtains the value of the power headroom from the physical layer to generate a PHR MAC control element, and restarts the timer “prohibitPHR-TIMER”. Besides, if the triggered PHR is a “Periodic PHR”, the UE restarts the periodic timer “PeriodicPHR-Timer”.
  • Detailed operations of the PHR procedure can be referred to in related specifications (3GPP TS 36.321, 36.213, 36.133) and are not narrated herein.
  • LTE-A LTE Advanced
  • CA Carrier Aggregation
  • the aggregated number of component carriers in the uplink (UL) and the downlink (DL) can be different.
  • the aggregated numbers of component carriers in the UL and the DL should be the same.
  • PHR Power Headroom Reporting
  • a method for performing Power Headroom Reporting (PHR) in a user equipment (UE) of a wireless communication system is disclosed.
  • the wireless communication system supports Carrier Aggregation (CA), such that the UE is able to perform transmission through multiple carriers.
  • CA Carrier Aggregation
  • the method includes steps of configuring a plurality of uplink carriers; and generating at least one PHR values, each corresponding to one of the plurality of uplink carriers.
  • a communications device for performing Power Headroom Reporting (PHR) in a user equipment (UE) of a wireless communication system.
  • the wireless communication system supports Carrier Aggregation (CA), such that the UE is able to perform transmission through multiple carriers.
  • the communications device includes a processor for executing a program code, and a memory, coupled to the processor, for storing the program code.
  • the program code includes steps of configuring a plurality of uplink carriers; and generating at least one PHR values, each corresponding to one of the plurality of uplink carriers.
  • FIG. 1 is a schematic diagram of a wireless communications system.
  • FIG. 2 is a function block diagram of a wireless communications device.
  • FIG. 3 is a diagram of a program code of FIG. 2 .
  • FIG. 4 is a flowchart of a process according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of a process according to another embodiment of the present invention.
  • FIG. 1 illustrates a schematic diagram of a wireless communications system 10 .
  • the wireless communications system 10 is preferred to be an LTE advanced (LTE-A) system, and is briefly composed of a network and a plurality of user equipments (UEs).
  • LTE-A LTE advanced
  • UEs user equipments
  • the network and the UEs are simply utilized for illustrating the structure of the wireless communications system 10 .
  • the network may comprise a plurality of base stations (Node Bs), radio network controllers and so on according to actual demands, and the UEs can be devices such as mobile phones, computer systems, etc.
  • FIG. 2 is a functional block diagram of a communications device 100 in a wireless communications system.
  • the communications device 100 can be utilized for realizing the UEs in FIG. 1 , and the wireless communications system is preferably the LTE system.
  • FIG. 2 only shows an input device 102 , an output device 104 , a control circuit 106 , a central processing unit (CPU) 108 , a memory 110 , a program code 112 , and a transceiver 114 of the communications device 100 .
  • the control circuit 106 executes the program code 112 in the memory 110 through the CPU 108 , thereby controlling an operation of the communications device 100 .
  • the communications device 100 can receive signals input by a user through the input device 102 , such as a keyboard, and can output images and sounds through the output device 104 , such as a monitor or speakers.
  • the transceiver 114 is used to receive and transmit wireless signals, delivering received signals to the control circuit 106 , and outputting signals generated by the control circuit 106 wirelessly. From a perspective of a communications protocol framework, the transceiver 114 can be seen as a portion of Layer 1, and the control circuit 106 can be utilized to realize functions of Layer 2 and Layer 3.
  • FIG. 3 is a diagram of the program code 112 shown in FIG. 2 .
  • the program code 112 includes an application layer 200 , a Layer 3 202 , and a Layer 2 206 , and is coupled to a Layer 1 218 .
  • the Layer 3 202 performs radio resource control.
  • the Layer 2 206 comprises a Radio Link Control (RLC) layer and a Medium Access Control (MAC) layer, and performs link control.
  • the Layer 1 218 performs physical connections.
  • RLC Radio Link Control
  • MAC Medium Access Control
  • the program code 112 supports Carrier Aggregation (CA), such that the UE is able to perform transmission through multiple carriers.
  • CA Carrier Aggregation
  • the MAC layer of the Layer 2 206 performs a Power Headroom. Reporting (PHR) procedure, to report power usage status of the UE to the serving base station, such that the network can allocate transmission resources and make scheduling decision efficiently.
  • PHR Power Headroom Reporting
  • the embodiment of the present invention provides power headroom reporting program code 220 for performing power headroom reporting under the carrier aggregation, so as to enhance the performance of system resource scheduling.
  • FIG. 4 illustrates a schematic diagram of a process 40 .
  • the process 40 is utilized for performing power headroom reporting in a UE of the wireless communications system 10 , and can be compiled into the power headroom reporting program code 220 .
  • the process 40 includes the following steps:
  • Step 400 Start.
  • Step 410 Configure a plurality of uplink carriers.
  • Step 420 Generate at least one PHR values, each corresponding to one of the configured uplink carriers.
  • Step 430 End.
  • the UE when the carrier aggregation functionality is activated, the UE generates PHR values, each corresponding to one of the configured uplink carriers, such that the network can be aware of the power usage status of each configured uplink carrier of the UE. As a result, the network can allocate transmission resources and make scheduling decision efficiently.
  • a MAC Protocol Data Unit consists of a MAC header, zero or more MAC Service Data Units (SDUs), zero or more MAC control elements, and optionally padding.
  • a MAC PDU header consists of one or more MAC PDU sub-headers, each corresponding to either a MAC SDU, a MAC control element or padding.
  • the MAC PDU sub-headers have the same order as the corresponding MAC SDUs, MAC control elements and padding.
  • the PHR values of the configured uplink carriers can be together transmitted in a pre-defined uplink carrier, or can be individually transmitted in its corresponding uplink carrier.
  • the UE may generate a plurality of PHR MAC Control Elements carried by a same MAC PDU according to the PHR values of each configured uplink carrier.
  • Each PHR MAC Control Element may have an identification field, for identifying which uplink carrier the carried PHR value is corresponding to. The identification field can be included either in the PHR MAC Control Element, or in a MAC sub-header corresponding to the PHR MAC Control Element.
  • the PHR values of the configured uplink carriers can be all carried by one PHR MAC Control Element through encoding.
  • the PHR MAC Control Element may need an indication field for indicating the number of carried PHR values.
  • the PHR MAC Control Element may have an identification field, for identifying which uplink carrier the carried PHR value is corresponding to.
  • the identification field can be included either in the PHR MAC Control Element, or in a MAC sub-header corresponding to the PHR MAC Control Element.
  • the UE may generate a plurality of PHR MAC Control Elements each carried by different MAC PDUs according to the PHR values of the configured uplink carriers.
  • each of the PHR MAC Control Elements may have an identification field, for identifying which uplink carrier the carried PHR value is corresponding to.
  • the number of PHR values generated by the UE is generally equal to the number of configured uplink carriers. However, in some cases, such as PHR functionality of some uplink carriers is not activated, the number of PHR values would be less than the number of configured uplink carriers, but equal to the number of uplink carriers with activated PHR functionality in the configured uplink carriers
  • the UE For supporting the carrier aggregation, the UE generates the PHR values, each corresponding to one of the configured uplink carriers, such that the network can be aware of the power usage status of each configured uplink carrier of the UE. As a result, the network can allocate transmission resources and make scheduling decision efficiently.
  • FIG. 5 illustrates a schematic diagram of a process 50 .
  • the process 50 is utilized for triggering power headroom reporting in a UE of the wireless communications system 10 , and can be compiled into the power headroom reporting program code 220 .
  • the process 50 includes the following steps:
  • Step 500 Start.
  • Step 510 Perform PHR for each of configured uplink carriers.
  • Step 520 Trigger the PHR corresponding to a second uplink carrier of the configured uplink carriers when the PHR corresponding to a first uplink carrier of the configured uplink carriers is triggered.
  • Step 530 End.
  • the UE when the carrier aggregation is activated, the UE performs PHR for each of the configured uplink carriers, respectively.
  • the UE when the PHR corresponding to a first uplink carrier of the configured uplink carriers is triggered, the UE triggers the PHR corresponding to a second uplink carrier of the configured uplink carriers. That is to say, in the embodiment of the present invention, the PHR triggering of each uplink carrier is linked to each other.
  • the UE shall trigger the PHR of the second uplink carrier or other configured uplink carriers, for enabling the network to be aware of the power usage status of each uplink carrier of the UE, such that the network is able to allocate radio resources to the UE.
  • the PHR corresponding to the first uplink carrier can also be triggered due to a periodic timer, which also belongs to the scope of the present invention, as long as the PHR triggering of each uplink carrier is linked to each other.
  • the UE of the LTE system utilizes a periodic timer “periodicPHR-Timer” and a timer “prohibitPHR-TIMER” for prohibiting power headroom reporting to control the PHR triggering.
  • periodic timer periodic timer
  • prohibitPHR-TIMER timer
  • the UE may have multiple sets of timers, each corresponding to one of the configured uplink carriers, for controlling the PHR triggering of the configured uplink carriers.
  • the said timers may include a periodic timer “periodicPHR-Timer” and a timer “prohibitPHR-TIMER” for prohibiting power headroom reporting, but are not restricted herein.
  • the number of each kind of timer is preferably equal to the number of configured uplink timers.
  • the embodiment of the present invention keeps all other triggered PHR pending to allow the trigger PHR able to be sent to the network continuously.
  • Such variation also belongs to the scope of the present invention.
  • the UE shall perform the PHR for each of the configured uplink carriers.
  • the process 50 provides the PHR triggering method, for allowing the PHR triggering of each configured uplink carrier being linked to each other.
  • the network is able to obtain power usage status of each configured uplink carrier, and performs resource allocation and scheduling decision more efficiently.
  • the present invention provides a method and apparatus for performing Power Headroom Reporting to support carrier aggregation in a user equipment (UE) of a wireless communication system.
  • UE user equipment

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  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
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EP (2) EP2234316B1 (fr)
JP (1) JP5033207B2 (fr)
KR (2) KR101195482B1 (fr)
CN (1) CN101848487B (fr)
TW (1) TWI413431B (fr)

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US20100238863A1 (en) 2010-09-23
CN101848487A (zh) 2010-09-29
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JP2010226720A (ja) 2010-10-07
EP2634950A3 (fr) 2015-10-28
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TWI413431B (zh) 2013-10-21
CN101848487B (zh) 2013-01-02
EP2234316B1 (fr) 2013-05-29
KR20120095827A (ko) 2012-08-29
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KR101195482B1 (ko) 2012-10-29
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