JP2012169913A - Communication system, base station device, mobile station device, power headroom report method and integrated circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication system, a base station device, a mobile station device, a power headroom report method and an integrated circuit which enables a power headroom to be reported efficiently when a mobile station device needs to adjust transmission timing of plural uplinks in a communication system where base station and mobile station devices communicate with plural in-zone cells while simultaneously connected thereto.SOLUTION: In a communication system where a power headroom indicating a margin of the transmission power of plural in-zone connected cells is reported from a mobile station device to a base station device, the base station device activates in-zone cells whose transmission timings set in the mobile station device are not adjusted yet, and, when an activated in-zone cell has had its uplink transmission timing adjusted, the mobile station device determines that a power headroom trigger condition has been met.

Description

  The present invention relates to a communication system, a base station apparatus, a mobile station apparatus, a power headroom reporting method, and an integration that efficiently report power headroom when the mobile station apparatus needs to adjust a plurality of uplink transmission timings. Regarding the circuit.

  Evolved which realized high-speed communication by adopting OFDM (Orthogonal Frequency-Division Multiplexing) communication method and flexible scheduling of predetermined frequency and time unit called resource block in 3GPP (3rd Generation Partnership Project) which is a standardization project The standardization of Universal Terrestrial Radio Access (hereinafter referred to as EUTRA) was carried out.

  In 3GPP, advanced EUTRA that achieves higher-speed data transmission and has upward compatibility with EUTRA is being discussed. As a technique in Advanced EUTRA, carrier aggregation has been proposed. Carrier aggregation is a technique for improving a transmission rate by aggregating and using a plurality of different frequencies (also referred to as component carriers). Further, it has been proposed that a mobile station apparatus communicating with a base station apparatus using carrier aggregation has a plurality of uplink transmission timings (Timing Advance) for each frequency or component carrier (Non-patent Document 1). ).

  In EUTRA, a random access procedure is prepared in order to adjust the uplink transmission timing of the mobile station apparatus. In addition to the method in which the mobile station apparatus autonomously determines the necessity of the random access procedure and starts the random access procedure, the base station apparatus performs physical download in order for the specific mobile station apparatus to start the random access procedure. There is a method in which information indicating the start of a random access procedure is set in a link control channel and transmitted.

  In 3GPP, a power head room (PHR) that notifies the base station apparatus of the remaining power of the transmission power of the mobile station apparatus is used. The PHR represents the remaining power obtained by subtracting the transmission power necessary for the physical uplink shared channel or the physical uplink shared channel and the physical uplink control channel from the maximum transmission power of the mobile station apparatus in a certain component carrier, and the PHR is large. It shows that there is room in uplink transmission of the mobile station apparatus. The base station apparatus can execute appropriate scheduling such as allocating a modulation scheme with a high transmission rate and a large number of resources to the mobile station apparatus with reference to the reported PHR. Non-Patent Document 2 describes a conventional PHR calculation method.

  Further, the base station apparatus configures one cell by combining one downlink component carrier and one uplink component carrier. Note that the base station apparatus can configure one cell with only one downlink component carrier.

R2-101567, NTT DOCOMO, 3GPP TSG-RAN WG2 # 69, 22-26 February 2010, San Francisco, USA TS 36.213, Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures V10.0.1; http: // www. 3 gpp. org / ftp / Specs / html-info / 36213. htm

  However, the cell of the newly added component carrier is in an inactive state (details will be described later) in which data transmission / reception and physical downlink control channel monitoring are not performed. Further, as proposed in Non-Patent Document 1, it has a plurality of uplink transmission timings and adjusts each uplink transmission timing for each uplink component carrier (or for each uplink component carrier group or uplink frequency). In such a case, at the timing when the component carrier is activated, there is a component carrier that cannot be transmitted because the uplink transmission timing is not adjusted. This means that even if the mobile station apparatus reports PHR of a component carrier that cannot be transmitted, the base station apparatus cannot perform scheduling using the component carrier.

  Therefore, when the mobile station apparatus sets component carriers having a plurality of uplink transmission timings, there is no specific solution for the problem that the base station apparatus reports PHR of component carriers that cannot be scheduled. Patent Document 1 and Non-Patent Document 2 do not show anything.

  In view of the above problems, an object of the present invention is to provide a communication system, a base station apparatus, and a mobile station that can efficiently report power headroom when the mobile station apparatus needs to adjust a plurality of uplink transmission timings. An object is to provide a station apparatus, a power headroom reporting method, and an integrated circuit.

  (1) In order to achieve the above object, the present invention takes the following measures. That is, the communication system of the present application is a communication system that reports power headroom indicating the remaining transmission power of a plurality of connected serving cells from a mobile station apparatus to a base station apparatus, and The serving cell includes a first serving cell that is always activated, a second serving cell that is activated or deactivated with the same transmission timing as the first serving cell, and the first serving cell. A third serving cell that is activated or deactivated with a transmission timing different from that of the serving cell, and the base station device sets the third serving cell set in the mobile station device. The mobile station apparatus activates the third serving cell and then activates the uplink transmission timing of the third serving cell activated based on the transmission timing adjustment information from the base station apparatus. When adjusting the power head Characterized by determining that room trigger conditions are met.

  (2) Moreover, in the communication system of this application, the said transmission timing adjustment information is notified from the said base station apparatus using Contention based Random Access procedure, It is characterized by the above-mentioned.

  (3) Moreover, in the communication system of this application, the said transmission timing adjustment information is notified from the said base station apparatus using a Non-contention based Random Access procedure, It is characterized by the above-mentioned.

  (4) Further, in the communication system of the present application, the mobile station device is activated with the first visited cell, the activated second visited cell, and uplink transmission timing. The power headroom is reported including a third in-zone cell in which is adjusted.

  (5) Further, the communication system of the present application is a communication system that reports a power headroom indicating a surplus of transmission power of a plurality of connected serving cells from a mobile station device to a base station device, The plurality of serving cells include a first serving cell that is always activated, a second serving cell that is activated or deactivated having the same transmission timing as the first serving cell, and A third serving cell to be activated or deactivated having a transmission timing different from that of the first serving cell, and the base station device sets the third serving cell set in the mobile station device. Activating the serving cell, the mobile station apparatus starts a random access procedure when the third serving cell is activated, and when the random access procedure is successful, the trigger condition of the power headroom is Judgment is satisfied And wherein the door.

  (6) In the communication system of the present application, the random access procedure is a Contention based Random Access procedure, and the mobile station apparatus satisfies a power headroom trigger condition when it correctly receives contention resolution. It is characterized by judging.

  (7) In the communication system of the present application, the random access procedure is a non-contention based random access procedure, and the mobile station apparatus satisfies a power headroom trigger condition when a random access response is correctly received. It is characterized by judging.

  (8) Further, in the communication system of the present application, the mobile station device is activated with the first visited cell, the activated second visited cell, and the random access procedure is successful. The power headroom is reported including the third in-zone cell.

  (9) Moreover, the mobile station apparatus of this application is a mobile station apparatus in the communication system which reports the power headroom which shows the remaining power of the transmission power of the several connected cell to the base station apparatus from a mobile station apparatus. The plurality of serving cells include a first serving cell that is always activated, and a second serving cell that is activated or deactivated having the same transmission timing as the first serving cell. A serving cell and a third serving cell that is activated or deactivated having a transmission timing different from that of the first serving cell, and the base station device includes the third serving cell. Is activated when the uplink transmission timing of the third serving cell activated based on the transmission timing adjustment information acquired using the random access procedure is adjusted. Power Characterized by determining a trigger condition Dorumu are met.

  (10) Further, the mobile station apparatus of the present application is activated with the first serving cell, the activated second serving cell, and the uplink transmission timing is adjusted. The power headroom is reported including the third serving cell.

  (11) Further, the mobile station apparatus of the present application is a mobile station apparatus in a communication system that reports power headroom indicating the surplus of transmission power of a plurality of connected serving cells from the mobile station apparatus to the base station apparatus. The plurality of serving cells include a first serving cell that is always activated, and a second serving cell that is activated or deactivated having the same transmission timing as the first serving cell. A serving cell and a third serving cell that is activated or deactivated having a transmission timing different from that of the first serving cell, and the base station device includes the third serving cell. When a random access procedure is activated, a random access procedure is started, and when the random access procedure is successful, it is determined that the trigger condition of the power headroom is satisfied.

  (12) Further, when the random access procedure is a Contention based Random Access procedure, the mobile station apparatus of the present application determines that the power headroom trigger condition is satisfied when the contention resolution is correctly received. It is characterized by.

  (13) In addition, when the random access procedure is a Non-contention based Random Access procedure, the mobile station apparatus of the present application determines that the power headroom trigger condition is satisfied when the random access response is correctly received. It is characterized by.

  (14) Further, the mobile station device of the present application includes a first serving cell, a second serving cell that has been activated, a third serving cell that has been activated and the random access procedure has been successful. The power headroom is reported including the service cell.

  (15) In addition, the base station apparatus of the present application is a base station apparatus in a communication system that reports power headroom indicating the remaining power of transmission power of a plurality of connected cells from the mobile station apparatus to the base station apparatus. The plurality of serving cells include a first serving cell that is always activated, and a second serving cell that is activated or deactivated having the same transmission timing as the first serving cell. A third serving cell that is activated or deactivated and has a transmission timing different from that of the first serving cell, and the third residing cell set in the mobile station apparatus. The mobile station device is requested to start a random access procedure by activating a serving cell, and is activated based on the transmission timing adjustment information notified to the mobile station device using the random access procedure. Area Characterized in that for reporting the power headroom after adjusting the uplink transmission timing Le.

  (16) In addition, the base station apparatus of the present application is a base station apparatus in a communication system that reports power headroom indicating the remaining power of transmission power of a plurality of connected cells from the mobile station apparatus to the base station apparatus. The plurality of serving cells include a first serving cell that is always activated, and a second serving cell that is activated or deactivated having the same transmission timing as the first serving cell. A third serving cell that is activated or deactivated and has a transmission timing different from that of the first serving cell, and the third residing cell set in the mobile station apparatus. The mobile station device is requested to start a random access procedure by activating a serving cell, and the mobile station apparatus is made to report the power headroom after the random access procedure is successful.

  (17) Moreover, the power headroom reporting method of the present application is a mobile communication system that reports power headroom indicating the remaining transmission power of a plurality of connected cells from a mobile station device to a base station device. A power headroom reporting method for a station apparatus, wherein the plurality of serving cells include a first serving cell that is always activated and an activation or non-activation that has the same transmission timing as the first serving cell. The base station apparatus includes a second serving cell to be activated and a third serving cell to be activated or deactivated having a transmission timing different from that of the first serving cell. Activates the third serving cell set in the mobile station device, and the mobile station device activates the third serving cell and then activates the third serving cell based on transmission timing adjustment information from the base station device. The activated third Characterized by determining a trigger condition of the power headroom is satisfied when adjusting the uplink transmission timing of the serving cell.

  (18) In addition, the power headroom reporting method of the present application is a mobile communication system that reports power headroom indicating the remaining transmission power of a plurality of connected cells from a mobile station apparatus to a base station apparatus. A power headroom reporting method for a station apparatus, wherein the plurality of serving cells include a first serving cell that is always activated and an activation or non-activation that has the same transmission timing as the first serving cell. The base station apparatus includes a second serving cell to be activated and a third serving cell to be activated or deactivated having a transmission timing different from that of the first serving cell. Activates the third serving cell set in the mobile station device, and the mobile station device starts a random access procedure when the third serving cell is activated, and the random access Successful procedure Characterized by determining a trigger condition of the power headroom is satisfied when the.

  (19) Further, the integrated circuit of the present application is a mobile station apparatus in a communication system that reports power headroom indicating the remaining transmission power of a plurality of connected cells to a base station apparatus from the mobile station apparatus. An integrated circuit to be mounted, wherein the plurality of serving cells are activated or deactivated with a first serving cell that is always activated and the same transmission timing as the first serving cell. A second serving cell and a third serving cell that is activated or deactivated having a transmission timing different from that of the first serving cell, and the base station device includes the first serving cell. When the third serving cell is activated, the random access procedure is started, and the uplink transmission timing of the third serving cell activated based on the transmission timing adjustment information acquired using the random access procedure Adjust Trigger conditions of the power headroom when characterized by determining that is satisfied.

  (20) Further, the integrated circuit of the present application is a mobile station apparatus in a communication system that reports power headroom indicating the remaining transmission power of a plurality of connected cells to a base station apparatus from a mobile station apparatus. An integrated circuit to be mounted, wherein the plurality of serving cells are activated or deactivated with a first serving cell that is always activated and the same transmission timing as the first serving cell. A second serving cell and a third serving cell that is activated or deactivated having a transmission timing different from that of the first serving cell, and the base station device includes the first serving cell. The random access procedure is started when the third serving cell is activated, and it is determined that the power headroom trigger condition is satisfied when the random access procedure is successful.

  In the present specification, the present invention is intended to improve a communication system, a base station apparatus, a mobile station apparatus, a power headroom reporting method, and an integrated circuit when a mobile station apparatus and a base station apparatus are connected using a plurality of frequencies simultaneously. Although the invention is disclosed, a communication system to which the present invention is applicable is not limited to a communication system that is upward compatible with EUTRA, such as EUTRA or Advanced EUTRA. For example, the present invention can be applied to UMTS (Universal Mobile Telecommunications System).

  As described above, according to the present invention, when a mobile station apparatus that can be connected to a base station apparatus using a plurality of frequencies needs to adjust a plurality of uplink transmission timings, the power headroom can be efficiently used. It is possible to provide a communication system, a base station device, a mobile station device, a power headroom reporting method, and an integrated circuit that enable reporting.

It is a block diagram which shows schematic structure of the mobile station apparatus in this invention. It is a block diagram which shows schematic structure of the base station apparatus in this invention. It is a figure for demonstrating the transmission possible timing of PHR in the 1st Embodiment of this invention. It is a sequence chart figure for demonstrating the procedure until it transmits PHR in the 1st Embodiment of this invention. It is a flowchart figure for demonstrating the procedure until it transmits PHR in the 1st Embodiment of this invention. It is a figure for demonstrating the transmission possible timing of PHR which concerns on the 2nd Embodiment of this invention. It is a sequence chart figure for demonstrating the procedure until it transmits PHR in the 2nd Embodiment of this invention. It is another sequence chart figure for demonstrating the procedure until it transmits PHR in the 2nd Embodiment of this invention. It is a sequence chart figure for demonstrating a Contention based Random Access procedure. It is a sequence chart figure for demonstrating a Non-contention based Random Access procedure. It is a figure which shows an example of the communication network structure which concerns on embodiment of this invention. It is the figure which showed an example of the setting of the component carrier with respect to the mobile station apparatus which concerns on embodiment of this invention.

  Before describing embodiments of the present invention, a brief description of carrier aggregation, physical channels, random access procedures, and power headroom reporting according to the present invention will be given.

[Career aggregation]
Carrier aggregation is a technology that aggregates (aggregates) a plurality of different frequencies (component carriers or frequency bands) and treats them as one frequency (frequency band). For example, when five component carriers having a frequency bandwidth of 20 MHz are aggregated by carrier aggregation, the mobile station apparatus can access these components as one frequency bandwidth of 100 MHz. The component carriers to be aggregated may be continuous frequencies, or may be frequencies at which all or part of them are discontinuous. For example, when the usable frequency is in the 800 MHz band, 2.4 GHz band, and 3.4 GHz band, one component carrier is transmitted in the 800 MHz band, another component carrier is transmitted in the 2 GHz band, and another component carrier is transmitted in the 3.4 GHz band. May be.

  It is also possible to aggregate a plurality of continuous or discontinuous component carriers in the same frequency band, for example, the 2.4 GHz band. The frequency bandwidth of each component carrier may be a frequency bandwidth narrower than 20 MHz, and the frequency bandwidth may be different from each other. The base station apparatus determines the number of uplink or downlink component carriers to be allocated to the mobile station apparatus based on various factors such as the amount of retained data buffer, the reception quality of the mobile station apparatus, the load in the cell, and QoS. Can be increased or decreased. It is desirable that the number of uplink component carriers assigned by the base station apparatus is the same as or less than the number of downlink component carriers.

[Physical channel]
The main physical channels (or physical signals) used in EUTRA and Advanced EUTRA will be described. A channel means a medium used for signal transmission, and a physical channel means a physical medium used for signal transmission. The physical channel may be added or changed in the future in EUTRA and Advanced EUTRA. However, even if the physical channel is changed, the description of each embodiment of the present invention is not affected.

  In EUTRA and Advanced EUTRA, scheduling of physical channels is managed using radio frames. One radio frame is 10 ms, and one radio frame is composed of 10 subframes. Further, one subframe is composed of two slots (that is, one slot is 0.5 ms). Also, resource blocks are used as a minimum scheduling unit in which physical channels are allocated. A resource block is defined by a constant frequency region composed of a set of a plurality of subcarriers (for example, 12 subcarriers) and a region composed of a constant transmission time interval (1 slot) on the frequency axis.

  Synchronization signals (Synchronization Signals) are composed of three types of primary synchronization signals and secondary synchronization signals composed of 31 types of codes arranged alternately in the frequency domain. By the combination, 504 kinds of cell identifiers (Cell ID: PCI) for identifying base station apparatuses and frame timing for radio synchronization are shown. The mobile station device specifies the cell ID of the synchronization signal received by the cell search.

  A physical broadcast information channel (PBCH; Physical Broadcast Channel) is transmitted for the purpose of notifying control parameters (broadcast information (system information): System information) commonly used by mobile station apparatuses in a cell. Broadcast information that is not notified on the physical broadcast information channel is transmitted as a layer 3 message (system information) on the physical downlink shared channel after the radio resource is notified on the physical downlink control channel. As broadcast information, a cell global identifier (CGI) indicating a cell-specific identifier, a tracking area identifier (TAI) for managing a standby area by paging, random access control information, and the like are notified.

  The downlink reference signal is a pilot signal transmitted at a predetermined power for each cell. The downlink reference signal is a known signal that is periodically repeated at a frequency / time position based on a predetermined rule. The mobile station apparatus measures the reception quality for each cell by receiving the downlink reference signal. The mobile station apparatus also uses the downlink reference signal as a reference signal for demodulating the physical downlink control channel or the physical downlink shared channel transmitted simultaneously with the downlink reference signal. As a sequence used for the downlink reference signal, a sequence that can be identified for each cell is used. In addition, although a downlink reference signal may be described as cell-specific reference signal (RS), the use and meaning are the same.

  A physical downlink control channel (PDCCH; Physical Downlink Control Channel) is transmitted in some OFDM symbols from the beginning of each subframe, and radio resource allocation information according to the scheduling of the base station device to the mobile station device, It is used for the purpose of instructing the adjustment amount of increase / decrease of transmission power. The mobile station apparatus monitors (monitors) a physical downlink control channel addressed to itself before transmitting / receiving a layer 3 message (paging, handover command, etc.) that is downlink data or downlink control data, and By receiving the physical downlink control channel, it is necessary to acquire radio resource allocation information called an uplink grant at the time of transmission and a downlink grant (downlink assignment) at the time of reception from the physical downlink control channel.

  The physical uplink control channel (PUCCH) is a reception acknowledgment (ACK / NACK: Acknowledgement / Negative Acknowledgement) of data transmitted on the physical downlink shared channel and downlink propagation path information (CQI: Channel). It is used to perform a scheduling request (SR) that is an uplink radio resource request.

  The physical downlink shared channel (PDSCH) notifies the mobile station apparatus of broadcast information that is not included in the paging or physical broadcast information channel as a layer 3 message that is downlink control data in addition to downlink data. Also used for. The radio resource allocation information of the physical downlink shared channel is indicated by the physical downlink control channel.

  A physical uplink shared channel (PUSCH) mainly transmits uplink data and uplink control data, and can also include control data such as downlink reception quality and ACK / NACK. Similarly to the downlink, the radio resource allocation information of the physical uplink shared channel is indicated by the physical downlink control channel.

  The uplink reference signal (uplink reference signal: uplink pilot signal, also referred to as uplink pilot channel) is transmitted from the base station apparatus to the physical uplink control channel PUCCH and / or the physical uplink shared channel PUSCH. Demodulation reference signal (DRS) used for demodulation and a sounding reference signal (SRS) used mainly by the base station apparatus to estimate the uplink channel state It is.

  A physical random access channel (PRACH) is a channel used for notifying a preamble sequence and has a guard time. The preamble sequence is configured so as to express 6-bit information by preparing 64 types of sequences. The physical random access channel is used as a means for accessing the base station apparatus of the mobile station apparatus. The mobile station apparatus transmits a radio resource request when the physical uplink control channel is not set, and transmission timing adjustment information (timing advance (TA)) required to match the uplink transmission timing with the reception timing window of the base station apparatus. The physical random access channel is used to request the base station apparatus. Specifically, the mobile station apparatus transmits a preamble sequence using the radio resource for the physical random access channel set by the base station apparatus. The mobile station apparatus that has received the transmission timing adjustment information sets a transmission timing timer (TA timer) that counts the effective time of the transmission timing adjustment information. During the effective time, the transmission timing adjustment state is set. The state is managed as an adjustment state (transmission timing unadjusted state). Since other physical channels are not related to each embodiment of the present invention, detailed description thereof is omitted.

[Random access procedure]
A series of procedures relating to random access is referred to as a random access procedure. The random access procedure includes two procedures, a Contention based Random Access (contention based random access) procedure and a Non-contention based Random Access (non-contention based random access) procedure.

  The Contention based Random Access procedure is a random access procedure in which preamble sequences transmitted by different mobile station devices may collide (contention), and the mobile station device is not connected (communication) with the base station device. It is used for initial access or for a scheduling request for requesting uplink transmission resources when the mobile station apparatus is connected to the base station apparatus. The collision of preamble sequences means that a plurality of mobile station apparatuses transmit physical random access channels using the same preamble sequence using the same frequency / time resource. Note that a preamble sequence collision is also referred to as a random access collision.

  Non-contention based Random Access procedure is a random access procedure in which no collision occurs in preamble sequences transmitted by different mobile station devices, and the mobile station device is connected to the base station device, and uplink synchronization Is started in response to an instruction from the base station apparatus. The start of the Non-contention based Random Access procedure is instructed by an RRC (Radio Resource Control: Layer 3) layer message and control data of the physical downlink control channel PDCCH.

  The preamble sequence (dedicated preamble) used in the Non-contention based Random Access procedure is individually notified from the base station apparatus to the mobile station apparatus. The preamble sequence used in the Contention based Random Access procedure is selected and used by the mobile station device at random during random access from the preamble sequences that are not used as individual preambles. Among the preamble sequences that can be used by the mobile station apparatus in a certain cell, the number of preamble sequences respectively used in the Contention based Random Access procedure and the Non-contention based Random Access procedure is notified from the base station apparatus.

  The Contention based Random Access procedure will be briefly described with reference to FIG. First, the mobile station apparatus 1 sends to the base station apparatus 2 a preamble sequence (random access preamble) selected based on the downlink radio propagation path state (path loss) and the size of message 3 (message transmitted in step S3). Transmit (step S1). The base station device 2 that has received the random access preamble calculates a transmission timing shift amount between the mobile station device 1 and the base station device 2 from the random access preamble, and transmits the response to the random access preamble (random access response). It transmits to the mobile station apparatus 1 including the transmission timing adjustment information for adjusting the timing deviation (step S2).

  The mobile station apparatus 1 checks the contents of the random access response, and adjusts the uplink transmission timing from the transmission timing adjustment information when the preamble number corresponding to the transmitted random access preamble is included in the random access response. When adjusting the transmission timing, the mobile station apparatus 1 starts a transmission timing timer (TA timer) in which the adjusted transmission timing is valid. Further, the mobile station apparatus 1 transmits an upper layer message (upper layer message, RRC message) to the base station apparatus 2 based on the scheduling information included in the random access response (step S3). The base station apparatus 2 transmits a collision confirmation message (contention resolution) to the mobile station apparatus 1 that has received the upper layer message in step S3 (step S4), and completes the procedure.

  The non-contention based Random Access procedure will be briefly described with reference to FIG. First, the base station apparatus 2 notifies the mobile station apparatus 1 of the number of the dedicated preamble and the number of the physical random access channel to be used (random access channel number) (random access preamble allocation) (step S11). The random access channel number is a number indicating a physical random access channel to which an individual preamble of a number notified from the base station apparatus 2 to the mobile station apparatus 1 may be transmitted. For example, a certain random access channel number indicates that a dedicated preamble may be transmitted on all physical random access channels, and a certain random access channel number is transmitted on every two physical random access channels in the time direction. Indicates that it may be. The mobile station apparatus 1 transmits a preamble sequence (individual preamble) corresponding to the designated preamble number through a physical random access channel indicated by a random access channel number and permitted to transmit the dedicated preamble (step S12). . The base station apparatus 2 that has received the dedicated preamble calculates a transmission timing shift amount between the mobile station apparatus 1 and the base station apparatus 2 from the dedicated preamble, and a transmission timing shift in a response to the dedicated preamble (random access response). Is transmitted to the mobile station apparatus 1 including the transmission timing adjustment information for adjusting (step S13), and the procedure is completed.

  However, when the value of the preamble number notified from the base station apparatus 2 is 0, the mobile station apparatus 1 performs the Contention based Random Access procedure instead of the Non-contention based Random Access procedure. In this case, the mobile station apparatus 1 completes the procedure according to the procedure of step S1 to step S4 of FIG.

[Power Headroom Report]
The power headroom is calculated by the mobile station device for each frequency (component carrier, cell) and notified to the base station device. In the mobile station apparatus, the power headroom is calculated in the physical layer (layer 1) based on parameters set from the RRC layer, and is managed in the MAC layer. Further, the physical layer notifies the MAC layer of the calculated power headroom value of each component carrier.

  The MAC layer of the mobile station apparatus determines that it is the power headroom reporting timing when any of the following trigger conditions is satisfied, and performs PHR using the MAC control element included in the control header portion of the data. Transmit to the base station device. The trigger condition is (1) when the PHR report prohibition timer (Prohibit PHR timer) is stopped, and when the path loss value of the serving cell is deteriorated by a predetermined value or more than when the previous PHR was reported, (2) When the PHR period timer expires, (3) when the PHR setting is changed, and (4) when the secondary cell is activated.

  In Advanced ETURA, two types of report formats are defined as PHR. The first report format (type 1) is a report format applied when the mobile station apparatus can transmit only the physical uplink shared channel PUSCH in a certain subframe. Type 1 PHR uses different PHR calculation methods for subframes transmitting PUSCH and subframes not transmitting PUSCH, and the detailed calculation method follows the description in 3GPP TS36.213.

  The second report format (type 2) is a report format applied when the physical uplink control channel PUCCH and the physical uplink shared channel PUSCH can be transmitted simultaneously in a certain subframe of the mobile station apparatus. Type 2 PHR uses different PHR calculation methods for subframes transmitting PUCCH and PUSCH at the same time, subframes transmitting only PUSCH, and subframes transmitting only PUCCH. The detailed calculation method follows the description of 3GPP TS36.213.

  Based on the mobile station apparatus capability (UE capability) notified from the mobile station apparatus, the base station apparatus uses the layer 3 message to determine whether to use the type 1 or type 2 PHR report format. Set every time.

[Example of communication network configuration of the present invention]
FIG. 11 is a diagram showing an example of a communication network configuration according to the embodiment of the present invention. When the mobile station apparatus 1 can be wirelessly connected to the base station apparatus 2 by simultaneously using a plurality of frequencies (component carriers, Band1 to Band3) by carrier aggregation, a certain base station is used as a communication network configuration. The apparatus 2 includes transmission apparatuses 11 to 13 (and reception apparatuses 21 to 23 (not shown)) for each of a plurality of frequencies, and the configuration in which each frequency is controlled by one base station apparatus 2 is from the viewpoint of simplifying the control. Is preferred. The configuration of the base station apparatus 2 is not limited to FIG. However, the base station apparatus 2 may be configured to transmit a plurality of frequencies with a single transmission apparatus because the plurality of frequencies are continuous frequencies. Furthermore, a configuration in which transmission / reception timing differs for each frequency may be used. The number of transmitting devices and receiving devices and the frequency at which transmission and reception can be performed may be different. The communicable range of each frequency controlled by the transmission device of the base station device 2 is regarded as a cell. At this time, the areas (cells) covered by each frequency may have different widths and different shapes.

  However, in the description to be described later, each of the areas covered by the frequency of the component carrier configured by the base station apparatus 2 is referred to as a cell, and this is the definition of a cell in an actually operated communication system. Note that it can be different. For example, in some communication systems, some of the component carriers used by carrier aggregation may be defined simply as additional radio resources rather than cells. Moreover, it may be defined as an extended cell different from the conventional cell. By referring to the component carrier as a cell in the present invention, even if a case different from the definition of the cell in the actually operated communication system occurs, the gist of the present invention is not affected. Note that carrier aggregation is communication performed by a plurality of cells using a plurality of component carriers, and is also referred to as cell aggregation. The mobile station apparatus 1 may be wirelessly connected to the base station apparatus 2 via a relay station apparatus (or repeater) for each frequency. That is, the base station apparatus 2 of the present invention can be replaced with a relay station apparatus.

  Note that the third generation base station apparatus 2 defined by 3GPP is referred to as a Node B (NodeB), and the base station apparatus in EUTRA and Advanced EUTRA is referred to as an eNodeB (eNodeB). Note that the third-generation mobile station device 1 defined by 3GPP is referred to as UE (User Equipment). The base station device 2 manages a cell that is an area where the mobile station device 1 can communicate, and the cell is also referred to as a macro cell, a femto cell, a pico cell, or a nano cell according to the size of the area that can communicate with the mobile station device 1. . When the mobile station apparatus 1 can communicate with a certain base station apparatus 2, a cell used for communication with the mobile station apparatus 1 among the cells of the base station apparatus 2 is a serving cell. The other cells are referred to as neighboring cells. That is, when the mobile station apparatus 1 and the base station apparatus 2 communicate using a plurality of cells using carrier aggregation, there are a plurality of serving cells.

[Component carrier configuration setting example]
FIG. 12 shows the correspondence between the downlink component carrier and the uplink component carrier that the base station device 2 sets for the mobile station device 1 when the mobile station device 1 according to the embodiment of the present invention performs carrier aggregation. It is the figure which showed an example of the relationship. FIG. 12 shows a correspondence relationship between two downlink component carriers (downlink component carrier DL_CC1, downlink component carrier DL_CC2) and two uplink component carriers (uplink component carrier UL_CC1, uplink component carrier UL_CC2). However, the present invention is not limited to the case of two component carriers. The downlink component carrier DL_CC1 and the uplink component carrier UL_CC1 in FIG. 12, and the downlink component carrier DL_CC2 and the uplink component carrier DL_CC2 are cell-specific connected (Cell Specific Linkage).

  The cell-specific connection is, for example, a correspondence relationship (cooperation relationship) between uplink and downlink frequencies accessible to the base station device 2 when the mobile station device 1 is not carrier-aggregated. Is a part of the broadcast information (SIB2: System Information Block Type 2), and the corresponding relationship is indicated. The cell specific connection is also referred to as SIB2 linkage. The correspondence relationship between the uplink and downlink frequencies in the cell is explicitly indicated as frequency information in broadcast information, or when not explicitly indicated, the uplink and downlink frequencies are uniquely determined for each operating frequency. It is instructed implicitly by using information on the specified frequency difference. In addition to these methods, other methods may be used as long as the correspondence relationship between the uplink and downlink frequencies can be shown for each cell.

  On the other hand, the base station apparatus 2 may individually set the correspondence relationship between the downlink component carrier and the uplink component carrier for each mobile station apparatus 1 separately from the cell-specific connection (individual connection: UE Specific Linkage). Is possible. At this time, the setting of the individual connection is indicated by an RRC message (layer 3 message). The base station apparatus 2 can also assign a plurality of settings (configurations) necessary for transmission of the physical random access channel for each uplink component carrier or each uplink frequency.

  A cell including an uplink component carrier in which an uplink control channel for radio resource request is set and a downlink component carrier that is cell-specifically connected to the uplink component carrier is referred to as a primary cell (PCell). Is done. Moreover, the cell comprised from component carriers other than a primary cell is called a secondary cell (SCell: Secondary cell). Although the primary cell is not subject to activation / deactivation control (that is, it is considered to be always activated), the secondary cell has the activation / deactivation state, and the change of these states is In addition to being explicitly specified from the base station apparatus 2, the state is changed based on a timer set in the mobile station apparatus 1 for each component carrier. The primary cell and the secondary cell are also collectively referred to as a serving cell.

  Here, activation or deactivation of component carriers (ie, activation or deactivation of secondary cells) is configured to be controlled by an L2 (Layer 2) message that can be interpreted by a Layer 2 configuration task. . That is, activation or deactivation is controlled by a control command recognized by layer 2 after being decoded by the physical layer (layer 1). Note that the L2 message in EUTRA and Advanced EUTRA is notified by a control command (MAC control element: MAC Control Element) interpreted in the MAC layer.

  The mobile station apparatus 1 may stop monitoring the uplink grant and downlink grant (downlink assignment) used for scheduling of the deactivated component carrier (secondary cell). That is, monitoring of the physical downlink control channel may be stopped. Moreover, the mobile station apparatus 1 may stop the transmission of the uplink pilot channel called a sounding reference signal (SRS) regarding the uplink of the deactivated component carrier (secondary cell). Moreover, the mobile station apparatus 1 may stop transmission of a physical uplink control channel regarding the uplink of the deactivated component carrier (secondary cell). Moreover, the mobile station apparatus 1 may implement a measurement with a sampling rate lower than the activated state regarding the downlink of the deactivated component carrier (secondary cell).

  Considering the above matters, preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In the description of the present invention, detailed descriptions of known functions and configurations related to the present invention will be omitted if it is determined that the gist of the present invention will be obscured.

<First Embodiment>
A first embodiment of the present invention will be described below. The present embodiment relates to a power headroom reporting method at the time of carrier aggregation of the mobile station apparatus 1, and particularly shows a power headroom reporting method when the mobile station apparatus 1 manages a plurality of uplink transmission timings.

  FIG. 1 is a block diagram showing an example of a mobile station apparatus 1 according to the first embodiment of the present invention. The mobile station apparatus 1 includes a reception unit 101, a demodulation unit 102, a decoding unit 103, a measurement processing unit 104, a control unit 105, a random access control unit 106, a coding unit 107, a modulation unit 108, a transmission unit 109, and a timing management unit 110. The upper layer 111 and the PHR calculation unit 112 are configured. The upper layer 111 includes RRC (Radio Resource Control) that performs radio resource control. Further, the random access control unit 106 functions as a part of a MAC (Medium Access Control) layer that manages the data link layer.

  Prior to reception, mobile station apparatus control information is input from the upper layer 111 to the control unit 105, and control information related to reception is appropriately input to the reception unit 101, the demodulation unit 102, and the decoding unit 103 as reception control information. The mobile station apparatus control information is information necessary for radio communication control of the mobile station apparatus 1 configured by reception control information and transmission control information, is set by the base station apparatus 2 and system parameters, and requires an upper layer 111. In response, the data is input to the control unit 105. The reception control information includes information such as reception timing, multiplexing method, and radio resource arrangement information regarding each channel in addition to information on the reception frequency band.

  The reception signal is received by the reception unit 101. The receiving unit 101 receives a signal in the frequency band specified by the reception control information. The received signal is input to the demodulation unit 102. Demodulation section 102 demodulates the received signal, inputs the signal to decoding section 103 to correctly decode downlink data and downlink control data, and inputs each decoded data to higher layer 111. The measurement processing unit 104 measures the reception quality (SIR, SINR, RSRP, RSRQ, RSSI, path loss, etc.) of the downlink reference signal for each cell (component carrier), the physical downlink control channel or the physical downlink shared channel. Based on the measurement result of the reception error rate, downlink measurement information is generated, and the downlink measurement information is output to the upper layer 111. The downlink measurement information is used in the upper layer 111 to detect a radio link failure (Radio link failure) accompanied by radio link re-establishment and to perform radio link monitoring (Radio link monitoring) accompanied by stop of uplink transmission. It is done.

  Similarly, the downlink measurement information of the measurement processing unit 104 is output to the PHR calculation unit 112. In the PHR calculation unit 112, PHR control information including parameters necessary for PHR reporting is set by the upper layer 111. The PHR control information includes a plurality of timers related to PHR reporting (PHR reporting prohibition timer, PHR period timer), a PHR reporting format (type 1 or type 2), a difference value of path loss change used for a trigger condition, and a calculation of PHR. Including at least offset values and coefficients.

  The PHR calculation unit 112 calculates a power headroom value for each activated component carrier (secondary cell) based on the set PHR control information, downlink measurement information, and uplink transmission state. Also, the PHR calculation unit 112 determines, for each subframe, whether or not the PHR trigger condition is satisfied based on the states of a plurality of timers included in the input downlink measurement information and PHR control information. When the PHR calculation unit 112 determines that any of the trigger conditions of the PHR is satisfied, the transmission state of the uplink physical channel in the subframe at the time of the trigger, the set report format, and the downlink measurement The PHR value calculated based on the information is output to the upper layer 111.

  Prior to transmission, mobile station apparatus control information is input from the upper layer 111 to the control unit 105, and control information related to transmission is transmitted as control information, a random access control unit 106, an encoding unit 107, a modulation unit 108, and a transmission unit 109. Is entered appropriately. The transmission control information includes information such as encoding information, modulation information, transmission frequency band information, transmission timing for each channel, multiplexing method, and radio resource arrangement information as uplink scheduling information of the transmission signal. The random access control information is input from the upper layer 111 to the random access control unit 106. The random access control information includes preamble information, radio resource information for physical random access channel transmission, and the like. The upper layer 111 sets transmission timing adjustment information and a transmission timing timer used for adjusting the uplink transmission timing to the timing management unit 110 as necessary. The timing management unit 110 manages the uplink transmission timing state (transmission timing adjustment state or transmission timing non-adjustment state) based on the set information.

  The encoding unit 107 receives uplink data and uplink control data from the upper layer 111, and also receives random access data information related to transmission of the physical random access channel from the random access control unit 106. The encoding unit 107 generates a preamble sequence transmitted through the physical random access channel based on the random access data information. The encoding unit 107 appropriately encodes each data according to the transmission control information and outputs the data to the modulation unit 108.

  Modulating section 108 modulates the output from encoding section 107. The transmission unit 109 maps the output of the modulation unit 108 to the frequency domain, converts the frequency domain signal into a time domain signal, and performs power amplification on a carrier wave of a predetermined frequency. Further, the uplink transmission timing is adjusted according to the transmission timing adjustment information input from the timing management unit 110 and transmitted. A physical uplink shared channel in which uplink control data is arranged typically constitutes a layer 3 message (radio resource control message; RRC message). In FIG. 1, the other components of the mobile station apparatus 1 are omitted because they are not related to the present embodiment.

  FIG. 2 is a block diagram showing an example of the base station apparatus 2 according to the first embodiment of the present invention. The base station apparatus includes a reception unit 201, a demodulation unit 202, a decoding unit 203, a control unit 204, a coding unit 205, a modulation unit 206, a transmission unit 207, an upper layer 208, and a network signal transmission / reception unit 209.

  Upper layer 208 inputs downlink data and downlink control data to encoding section 205. The encoding unit 205 encodes the input data and inputs it to the modulation unit 206. Modulation section 206 modulates the encoded signal. The signal output from the modulation unit 206 is input to the transmission unit 207. Transmitter 207 maps the input signal to the frequency domain, then converts the frequency domain signal to a time domain signal, transmits the amplified signal on a carrier having a predetermined frequency, and transmits the signal. The physical downlink shared channel in which downlink control data is arranged typically constitutes a layer 3 message (RRC message).

  In addition, the reception unit 201 converts a signal received from the mobile station device 1 into a baseband digital signal. The digital signal is input to the demodulation unit 202 and demodulated. The signal demodulated by the demodulation unit 202 is then input to the decoding unit 203 and decoded, and the correctly decoded uplink control data and uplink data are output to the upper layer 208. Base station apparatus control information necessary for control of each block is information necessary for radio communication control of the base station apparatus 2 configured by reception control information and transmission control information, and a higher-level network apparatus (MME or gateway apparatus). ) And system parameters, and the upper layer 208 inputs to the control unit 204 as necessary. The control unit 204 transmits base station apparatus control information related to transmission to each block of the encoding unit 205, modulation unit 206, and transmission unit 207 as transmission control information, and base station apparatus control information related to reception to the reception control information. Are appropriately input to each block of the receiving unit 201, the demodulating unit 202, and the decoding unit 203. The RRC of the base station device 2 exists as part of the upper layer 208.

  On the other hand, the network signal transmission / reception unit 209 transmits or receives a control message between the base station apparatuses 2 or between the upper network apparatus and the base station apparatus 2. In FIG. 2, the other components of the base station apparatus 2 are omitted because they are not related to the present embodiment.

  The network configuration of the communication system in which the mobile station device 1 and the base station device 2 are arranged can be the same as that shown in FIG.

  The timing at which the mobile station apparatus 1 managing a plurality of transmission timings can report PHR will be described with reference to FIG. The horizontal axis of FIG. 3 shows the history of time. The mobile station device 1 is started from a state in which at least one inactivated secondary cell is set from the base station device 2. Such a state can typically be regarded as a state after a new secondary cell is added or after a handover is performed. Further, the secondary cell requires uplink transmission timing different from that of the primary cell.

  Time T01 indicates that the mobile station apparatus 1 has received the activation command for the deactivated secondary cell. The activation command may be notified by a MAC control element as usual, or may be notified by an RRC message or a physical downlink control channel.

  At this time, the mobile station apparatus 1 applies necessary settings accompanying activation of the secondary cell such as downlink measurement processing of the activated secondary cell and transmission of an uplink reference signal in the uplink if necessary. Processing time is required. The mobile station device 1 considers that the secondary cell is actually activated at time T02 when a delay time n1 (for example, 8 subframes) used for this processing time has elapsed. The time T02 coincides with the timing at which the random access procedure for the secondary cell can be started.

  The mobile station apparatus 1 starts a random access procedure in the secondary cell at any timing after time T02 and transmits a physical random access channel to the base station apparatus 2. Typically, the random access procedure is started in the latest subframe in which there is a random access resource that can be used by the mobile station apparatus 1 after time T02. Then, a random access response is received from the base station device 2 at time T03. The random access procedure is performed in the secondary cell.

  The timing when the mobile station apparatus 1 starts the random access procedure in the secondary cell between time T02 and time T03 is, for example, the same as (1) the timing when the secondary cell is activated, and (2) the activation of the secondary cell. It is conceivable that the start of random access is instructed by the MAC control element after activation, or (3) the start of random access is instructed by the physical downlink control channel PDCCH after the activation of the secondary cell. In the form, any of the timings described above may be used.

  Then, at time T03, the mobile station apparatus 1 receives the random access response, thereby acquiring the uplink transmission timing (secondary cell uplink transmission timing) of the secondary cell cell. The mobile station device 1 needs a delay time n2 as a processing time for adjusting the uplink transmission timing of the secondary cell. The mobile station apparatus 1 determines that the power headroom report of the secondary cell is possible (PHR transmission is possible) after time T04 when the delay time n2 (for example, 4 subframes) has elapsed.

  Then, the mobile station apparatus 1 starts the same procedure as when the PHR trigger condition is satisfied, and includes the primary cell, the transmission timing adjustment state, and the activated secondary cell PHR in the MAC control element. Transmit to device 2.

  That is, the mobile station apparatus 1 of the present embodiment is (1) when the PHR report prohibition timer (Prohibit PHR timer) is stopped as a PHR trigger condition instead of the conventional EUTRA PHR trigger condition. When the path loss value of the primary cell or transmission timing adjustment state and the activated secondary cell has deteriorated by a predetermined value or more than when the previous PHR was reported, (2) the PHR period timer (Periodic PHR timer) expired (3) When the setting of PHR is changed, (4) When the secondary cell is activated to enter the transmission timing adjustment state is used. The mobile station apparatus 1 transmits the PHR of the primary cell and the activated secondary cell in the transmission timing adjustment state to the base station apparatus 2 when any of the PHR trigger conditions described above is satisfied.

  FIG. 4 is a sequence chart diagram showing signaling exchange regarding power headroom reports accompanying activation of the secondary cell between the mobile station apparatus 1 and the base station apparatus 2 according to the present embodiment. The mobile station device 1 is started from a state in which at least one inactivated secondary cell is set from the base station device 2. Furthermore, the uplink transmission timing different from the primary cell is set for the secondary cell.

  Here, in step S101, an activation command for the secondary cell in the transmission timing non-adjusted state is notified from the base station apparatus 2. The activation command may be notified by a MAC control element as usual, or may be notified by an RRC message or a physical downlink control channel.

  The mobile station device 1 determines a random access trigger as to whether or not to start a random access procedure for the activated secondary cell (step S102). The timing when the mobile station device 1 starts the random access procedure in the secondary cell is, for example, (1) the same as the timing when the secondary cell is activated, or (2) the random access procedure is performed by the MAC control element after the activation of the secondary cell. When the start is instructed, (3) When the start of the random access procedure is instructed on the physical downlink control channel PDCCH after the activation of the secondary cell, (4) The layer 3 message (RRC message) after the activation of the secondary cell In this embodiment, any one of the timings described above may be used.

  In step S103, the mobile station apparatus 1 starts a random access procedure for the secondary cell in the transmission timing non-adjusted state, and transmits a physical random access channel to the base station apparatus 2. The base station apparatus 2 that has received the physical random access channel transmits a random access response to the mobile station apparatus 1 in step S104. The details of step S103 and step S104 may be the same as in FIG. 9 or FIG.

  Then, the mobile station apparatus 1 performs secondary cell uplink transmission timing acquisition (step S105), and acquires uplink transmission timing adjustment information from the random access response in step S104. The uplink transmission timing is adjusted after a predetermined time (for example, after 4 subframes) after acquiring the transmission timing adjustment information. When the uplink state of the newly activated secondary cell becomes the transmission timing adjustment state, the mobile station device 1 determines that the PHR trigger condition is satisfied, and determines the PHR notified from the physical layer. A power headroom report is made by setting the MAC control information (step S106).

  FIG. 5 is a flowchart regarding power headroom reporting accompanying activation of the secondary cell of the mobile station apparatus 1 according to the present embodiment. The flowchart is started when at least one secondary cell in the transmission timing non-adjustment state is set for the mobile station apparatus 1 and an activation command for the secondary cell is received.

  First, the mobile station apparatus 1 monitors whether or not a random access procedure is triggered for the secondary cell (step S201). The timing when the mobile station device 1 starts the random access procedure in the secondary cell is, for example, (1) the same as the timing when the secondary cell is activated, (2) the random access is started by the MAC control element after the secondary cell is activated (3) When the start of random access is instructed on the physical downlink control channel PDCCH after activation of the secondary cell, (4) Random in layer 3 message (RRC message) after activation of the secondary cell When the start of access is instructed, any of the timings described above may be used in this embodiment.

  The mobile station apparatus 1 proceeds to step 202 when the secondary cell random access procedure is started, otherwise returns to step S201 and continues to monitor the trigger.

  In step 202, the mobile station apparatus 1 starts a random access procedure. In parallel with the execution of the random access procedure, the timing at which the power headroom can be reported is monitored, and whether or not the power headroom can be reported is determined every subframe (step S203). The mobile station apparatus 1 determines that the power headroom can be reported when the uplink state of the secondary cell activated by the random access procedure becomes the transmission timing adjustment state as described above. In other words, the mobile station apparatus 1 determines that the power headroom can be reported after a predetermined time has elapsed after receiving the transmission timing adjustment information of the activated secondary cell.

  Then, the mobile station apparatus 1 reports the power headroom by including the PHR of the primary cell notified from the physical layer and the PHR of the secondary cell in the activated and transmission timing adjusted state in the MAC control information (step S204).

  The random access procedure applied to FIGS. 3 to 5 may be either a Contention based Random Access (contention based random access) procedure or a Non-contention based Random Access (non-contention based random access) procedure. That is, regardless of which random access procedure is started, transmission timing adjustment information of the newly activated secondary cell is notified from the base station device 2 by the random access response and activated. In addition, the PHR is transmitted after adjusting the uplink transmission timing of the secondary cell based on the transmission timing adjustment information.

  In addition, the mobile station apparatus 1 is the case where the activated secondary cell has the same uplink transmission timing as the primary cell, or the activated secondary cell has the uplink transmission timing adjusted (transmission timing adjusted state). In the case where the uplink is not set in the activated secondary cell, the conventional PHR report trigger condition is applied.

  Further, the PHR reporting format may be either type 1 or type 2, and any of them does not affect the spirit of the present invention.

  Thus, according to the first embodiment, in the base station device 2, a cell (secondary cell) having an uplink frequency (uplink component carrier) whose uplink transmission timing is not adjusted is set in the mobile station device 1. If the secondary cell is activated, the mobile station apparatus 1 is made to adjust the uplink transmission timing of the secondary cell and then report the power headroom of the related cell. In addition, when a secondary cell whose uplink transmission timing is not adjusted is activated, the mobile station apparatus 1 starts a random access procedure, adjusts the uplink transmission timing of the secondary cell, and then sets the power headroom as a base. Transmit to the station apparatus 2.

  As described above, by configuring as in the first embodiment, the mobile station apparatus 1 reports the PHR of the component carrier (that is, the deactivated secondary cell) that cannot be scheduled to the base station apparatus 2. It is possible to solve the problem of conventional EUTRA.

  The mobile station apparatus 1 of this embodiment reports a power headroom after starting a random access procedure and adjusting a transmission timing. The mobile station apparatus 1 can be reused without extending the L2 message used for power headroom reporting. As described above, since the mobile station apparatus 1 reports the power headroom of the cell (component carrier) activated after the transmission timing adjustment state is established by the random access procedure, it is possible to reduce useless signaling. It becomes.

  Further, since the base station apparatus 2 of the present embodiment knows that the power headroom reported by the mobile station apparatus 1 is a schedulable component carrier, the secondary cell modulation scheme and the Resource allocation can be performed efficiently. Thus, the base station apparatus 2 can perform appropriate scheduling based on the reported power headroom.

<Second Embodiment>
A second embodiment of the present invention will be described below. In the present embodiment, a power headroom reporting method for reporting power headroom after a random access procedure is successful will be described. The configurations of the mobile station device 1 and the base station device 2 used in the present embodiment may be the same as those shown in FIGS.

  The network configuration of the communication system in which the mobile station device 1 and the base station device 2 are arranged can be the same as that shown in FIG.

  The timing at which the mobile station apparatus 1 that manages a plurality of transmission timings can report PHR will be described with reference to FIG. The horizontal axis in FIG. 6 shows the time course. The mobile station device 1 is started from a state in which at least one inactivated secondary cell is set from the base station device 2. Such a state can typically be regarded as a state after a new secondary cell is added or after a handover is performed. Further, the secondary cell requires uplink transmission timing different from that of the primary cell.

  Since a series of processing from time T01 to time T04 in FIG. 6 is the same as that in FIG. 3, the same reference numerals are assigned and the details thereof are omitted, and the operation after time T04 will be mainly described.

  The mobile station apparatus 1 performs a random access procedure that is being executed if necessary after time T04 when a delay time n2 (for example, 4 subframes) has elapsed as a processing time for adjusting the uplink transmission timing of the secondary cell. continue. Then, it is determined that the power headroom report of the secondary cell is possible (PHR transmission is possible) after time T05 when the random access procedure is successful.

  Then, the mobile station apparatus 1 starts the same procedure as when the PHR trigger condition is satisfied, and includes the primary cell, the transmission timing adjustment state, and the activated secondary cell PHR in the MAC control element. Transmit to device 2.

  That is, the mobile station apparatus 1 of the present embodiment is (1) when the PHR report prohibition timer (Prohibit PHR timer) is stopped as a PHR trigger condition instead of the conventional EUTRA PHR trigger condition. When the path loss value of the primary cell or transmission timing adjustment state and the activated secondary cell has deteriorated by a predetermined value or more than when the previous PHR was reported, (2) the PHR period timer (Periodic PHR timer) expired (3) When the PHR setting is changed, (4) When the random access procedure of the secondary cell is successful. The mobile station apparatus 1 transmits the PHR of the primary cell and the activated secondary cell in the transmission timing adjustment state to the base station apparatus 2 when any of the PHR trigger conditions described above is satisfied.

  FIG. 7 and FIG. 8 are sequence chart diagrams showing signaling exchanges regarding power headroom reports accompanying activation of secondary cells between the mobile station apparatus 1 and the base station apparatus 2 according to the present embodiment. FIG. 7 shows an example when the Contention based Random Access procedure is performed, and FIG. 8 shows an example when the Non-contention based Random Access procedure is performed.

  In FIG. 7, the mobile station apparatus 1 starts from a state in which at least one inactivated secondary cell is set from the base station apparatus 2. Furthermore, the uplink transmission timing different from the primary cell is set for the secondary cell. Here, in step S301, an activation command for the secondary cell in the transmission timing non-adjusted state is notified from the base station apparatus 2. The activation command may be notified by a MAC control element as usual, or may be notified by an RRC message or a physical downlink control channel.

  The mobile station apparatus 1 determines a random access trigger as to whether or not to start a random access procedure for the activated secondary cell (step S302). The timing at which the mobile station apparatus 1 starts the random access procedure in the secondary cell may be the same as that described in step S102 in FIG. However, the base station apparatus 2 does not notify the mobile station apparatus 1 of the individual preamble, and the mobile station apparatus 1 starts a Contention based Random Access procedure as a random access procedure.

  In step S303, the mobile station device 1 starts the Contention based Random Access procedure for the secondary cell in the transmission timing non-adjusted state, and transmits a physical random access channel to the base station device 2. The base station apparatus 2 that has received the physical random access channel transmits a random access response to the mobile station apparatus 1 in step S304. The details of step S303 and step S304 may be the same as in FIG.

  Then, the mobile station apparatus 1 performs secondary cell uplink transmission timing acquisition (step S305), and acquires uplink transmission timing adjustment information from the random access response in step S304. The uplink transmission timing is adjusted after a predetermined time (for example, after 4 subframes) after acquiring the transmission timing adjustment information. The mobile station apparatus 1 regards the uplink state of the newly activated secondary cell as the transmission timing adjustment state, and transmits an upper layer message to the base station apparatus 2 (step S306). Then, the base station apparatus 2 transmits a collision confirmation message (contention resolution) to the mobile station apparatus 1 (step S307). The details of step S306 and step S307 may be the same as in FIG.

  The mobile station apparatus 1 analyzes the contention resolution received in step S307 and confirms whether it is a response to the higher layer message transmitted in step S306. If it is confirmed that the response is to the higher layer message, it is determined that the Contention based Random Access procedure is successful (step S308). When the Contention based Random Access procedure is successful, the mobile station apparatus 1 determines that the PHR trigger condition is satisfied, sets the PHR notified from the physical layer in the MAC control information, and performs power headroom reporting (step) S309).

  On the other hand, in FIG. 8, the mobile station apparatus 1 starts from a state in which at least one inactivated secondary cell is set from the base station apparatus 2. Further, the secondary cell requires uplink transmission timing different from that of the primary cell. Here, in step S401, the activation command for the secondary cell in the transmission timing non-adjusted state is notified from the base station apparatus 2. The activation command may be notified by a MAC control element as usual, or may be notified by an RRC message or a physical downlink control channel.

  The mobile station apparatus 1 determines a random access trigger as to whether or not to start a random access procedure for the activated secondary cell (step S402). The timing at which the mobile station apparatus 1 starts the random access procedure in the secondary cell may be the same as that described in step S102 in FIG. However, the base station apparatus 2 notifies the mobile station apparatus 1 of an individual preamble, and the mobile station apparatus 1 starts a Non-contention based Random Access procedure as a random access procedure. The base station apparatus 2 notifies the mobile station apparatus 1 of the dedicated preamble by any one or more of the methods including notification in the PDCCH, notification by the MAC control element, and notification by the RRC message. Can be used.

  The mobile station apparatus 1 starts a Non-contention based Random Access procedure for the secondary cell in the transmission timing non-adjusted state in Step S <b> 403 and transmits a physical random access channel to the base station apparatus 2. The base station apparatus 2 that has received the physical random access channel transmits a random access response to the mobile station apparatus 1 in step S404. The details of step S403 and step S404 may be the same as in FIG.

  Then, the mobile station apparatus 1 performs secondary cell uplink transmission timing acquisition (step S405), and acquires uplink transmission timing adjustment information from the random access response in step S404. The uplink transmission timing is adjusted after a predetermined time (for example, after 4 subframes) after acquiring the transmission timing adjustment information. The mobile station apparatus 1 regards the uplink state of the newly activated secondary cell as the transmission timing adjustment state.

  The mobile station apparatus 1 determines that the Non-contention based Random Access procedure is successful by receiving the random access response in Step S404 in parallel with the processing in Step 405 (Step S406). When the non-contention based Random Access procedure is successful, the mobile station device 1 determines that the PHR trigger condition is satisfied, sets the PHR notified from the physical layer in the MAC control information, and performs power headroom reporting. (Step S407).

  The flowchart regarding the power headroom report accompanying the activation of the secondary cell of the mobile station apparatus 1 according to the present embodiment can be described using the same flowchart as FIG. However, in step S203 of FIG. 5, when the mobile station apparatus 1 succeeds in the random access procedure executed in the activated secondary cell to determine whether or not the power headroom can be reported, Judge that reporting is possible. In other words, when the mobile station apparatus 1 receives the contention resolution addressed to itself if it is a Contention based Random Access procedure, the mobile station apparatus 1 has successfully received a random access response if it is a Non-contention based Random Access procedure. It is sometimes determined that the power headroom of the secondary cell that has performed the random access can be reported.

  In addition, the mobile station apparatus 1 is the case where the activated secondary cell has the same uplink transmission timing as the primary cell, or the activated secondary cell has the uplink transmission timing adjusted (transmission timing adjusted state). In the case where the uplink is not set in the activated secondary cell, the conventional PHR report trigger condition is applied.

  Further, the PHR reporting format may be either type 1 or type 2, and any of them does not affect the spirit of the present invention.

  Thus, according to the second embodiment, in the base station device 2, a cell (secondary cell) having an uplink frequency (uplink component carrier) whose uplink transmission timing is not adjusted is set in the mobile station device 1. If the secondary cell is activated, the mobile station apparatus 1 is made to report the power headroom of the related cell after the random access procedure in the secondary cell is successful. Moreover, when the secondary cell whose uplink transmission timing is not adjusted is activated, the mobile station apparatus 1 starts a random access procedure, and after the random access procedure is successful, the mobile station apparatus 1 transfers the power headroom to the base station apparatus 2. And send.

  As described above, by configuring as in the second embodiment, the mobile station apparatus 1 reports the PHR of the component carrier (that is, the deactivated secondary cell) that cannot be scheduled to the base station apparatus 2. It is possible to solve the problem of conventional EUTRA.

  In particular, in the second embodiment, since the power headroom is reported after confirming that the random access procedure is successful, when the random access procedure fails after adjusting the transmission timing (particularly in the Contention based Random Access procedure). It is possible to report the power headroom efficiently considering the possibility of occurrence). In other words, since the mobile station apparatus 1 reports the power headroom after the secondary cell can be scheduled by the base station apparatus 2, it is possible to reduce useless signaling.

  The mobile station apparatus 1 of this embodiment reports a power headroom after a random access procedure is successful. The mobile station apparatus 1 can be reused without extending the L2 message used for power headroom reporting. Thus, since the mobile station apparatus 1 reports the power headroom of the cell (component carrier) activated after the random access procedure is successful, it is possible to reduce useless signaling.

  Further, since the base station apparatus 2 of the present embodiment knows that the power headroom reported by the mobile station apparatus 1 is a schedulable component carrier, the secondary cell modulation scheme and the Resource allocation can be performed efficiently. Thus, the base station apparatus 2 can perform appropriate scheduling based on the reported power headroom.

  The embodiment described above is merely an example, and can be realized using various modifications and replacement examples. For example, this uplink transmission scheme can be applied to both communication systems of the FDD (frequency division duplex) scheme and the TDD (time division duplex) scheme. In each embodiment, an example using a path loss as a measurement value of a downlink component carrier has been described. However, other measurement values (SIR, SINR, RSRP, RSRQ, RSSI, BLER) may be used instead. It is also possible to use a combination of a plurality of these measured values.

  Further, for convenience of explanation, the mobile station device 1 and the base station device 2 of the embodiment have been described using functional block diagrams. However, the functions of each part of the mobile station device 1 and the base station device 2 or one of these functions The mobile station device 1 and the base station device 2 are controlled by recording a program for realizing the unit on a computer-readable recording medium, causing the computer system to read and execute the program recorded on the recording medium. You can do it. Here, the “computer system” includes an OS and hardware such as peripheral devices.

  The “computer-readable recording medium” refers to a semiconductor medium (eg, RAM, nonvolatile memory card, etc.), an optical recording medium (eg, DVD, MO, MD, CD, BD, etc.), a magnetic recording medium (eg, , A magnetic tape, a flexible disk, etc.) and a storage device such as a disk unit built in a computer system. Furthermore, the “computer-readable recording medium” means that a program is dynamically held for a short time, like a communication line when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In this case, it is intended to include those that hold a program for a certain period of time, such as a volatile memory inside a computer system serving as a server or a client in that case. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system. .

  In addition, each functional block or various features of the mobile station device 1 and the base station device 2 used in the above embodiments may be configured in a circuit including an LSI that is typically an IC (integrated circuit). . In that case, the integration density of the LSI may be realized at any density. Each functional block and various features may be individually chipped, or a part or all of them may be integrated into a chip. Further, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. In addition, when an integrated circuit technology that replaces LSI appears due to progress in semiconductor technology, an integrated circuit based on the technology can also be used.

  As mentioned above, although embodiment of this invention has been explained in full detail based on the specific example, it is clear that the meaning of this invention and a claim are not limited to these specific examples. In other words, the description in the present specification is for illustrative purposes and does not limit the present invention.

DESCRIPTION OF SYMBOLS 1 ... Mobile station apparatus 2 ... Base station apparatus 11-13 ... Transmission apparatus 101, 201 ... Reception part 102, 202 ... Demodulation part 103, 203 ... Decoding part 104 ... Measurement processing part 105, 204 ... Control part 106 ... Random access control Reference numerals 107, 205 ... coding parts 108, 206 ... modulation parts 109, 207 ... transmission part 110 ... timing management parts 111, 208 ... upper layer 112 ... PHR calculation part 209 ... network signal transmission / reception part

Claims (20)

A communication system that reports power headroom indicating the remaining transmission power of a plurality of connected cells connected from a mobile station device to a base station device,
The plurality of serving cells include a first serving cell that is always activated, and a second serving cell that is activated or deactivated having the same transmission timing as the first serving cell, The first serving cell and the third serving cell to be activated or deactivated with different transmission timing,
The base station device activates the third serving cell set in the mobile station device,
The mobile station apparatus adjusts the uplink transmission timing of the third serving cell activated based on the transmission timing adjustment information from the base station apparatus after activating the third serving cell And determining that the power headroom trigger condition is satisfied.   The communication system according to claim 1, wherein the transmission timing adjustment information is notified from the base station apparatus using a Contention based Random Access procedure.   The communication system according to claim 1, wherein the transmission timing adjustment information is notified from the base station apparatus using a Non-contention based Random Access procedure.   The mobile station apparatus includes a first serving cell, an activated second serving cell, and a third serving cell that is activated and whose uplink transmission timing is adjusted. The communication system according to claim 1, wherein the power headroom is reported. A communication system that reports power headroom indicating the remaining transmission power of a plurality of connected cells connected from a mobile station device to a base station device,
The plurality of serving cells include a first serving cell that is always activated, and a second serving cell that is activated or deactivated having the same transmission timing as the first serving cell, The first serving cell and the third serving cell to be activated or deactivated with different transmission timing,
The base station device activates the third serving cell set in the mobile station device,
The mobile station apparatus starts a random access procedure when the third serving cell is activated, and determines that a power headroom trigger condition is satisfied when the random access procedure is successful. A featured communication system.   6. The random access procedure is a Contention based Random Access procedure, and the mobile station apparatus determines that a power headroom trigger condition is satisfied when contention resolution is correctly received. The communication system according to 1.   6. The random access procedure is a Non-contention based Random Access procedure, and the mobile station apparatus determines that a power headroom trigger condition is satisfied when a random access response is correctly received. The communication system according to 1.   The mobile station apparatus includes the first serving cell, the activated second serving cell, and the third serving cell that has been activated and the random access procedure has been successful. The communication system according to claim 1, wherein the power headroom is reported. A mobile station apparatus in a communication system that reports power headroom indicating the remaining transmission power of a plurality of connected cells connected from a mobile station apparatus to a base station apparatus,
The plurality of serving cells include a first serving cell that is always activated, and a second serving cell that is activated or deactivated having the same transmission timing as the first serving cell, The first serving cell and the third serving cell to be activated or deactivated with different transmission timing,
The third serving area activated when the base station apparatus activates the third serving cell and starts the random access procedure and is activated based on the transmission timing adjustment information acquired using the random access procedure. A mobile station apparatus, characterized in that a power headroom trigger condition is determined to be satisfied when a cell uplink transmission timing is adjusted.   The power head includes a first serving cell, a second serving cell that is activated, and a third serving cell that is activated and whose uplink transmission timing is adjusted. The mobile station apparatus according to claim 9, wherein a room is reported. A mobile station apparatus in a communication system that reports power headroom indicating the remaining transmission power of a plurality of connected cells connected from a mobile station apparatus to a base station apparatus,
The plurality of serving cells include a first serving cell that is always activated, and a second serving cell that is activated or deactivated having the same transmission timing as the first serving cell, The first serving cell and the third serving cell to be activated or deactivated with different transmission timing,
The base station apparatus starts a random access procedure when the third serving cell is activated, and determines that a power headroom trigger condition is satisfied when the random access procedure is successful. A mobile station device to perform.   The mobile station according to claim 11, wherein when the random access procedure is a Contention based Random Access procedure, it is determined that a power headroom trigger condition is satisfied when contention resolution is correctly received. apparatus.   The mobile station according to claim 11, wherein when the random access procedure is a Non-contention based Random Access procedure, it is determined that a power headroom trigger condition is satisfied when a random access response is correctly received. apparatus.   Report the power headroom including the first serving cell, the activated second serving cell, and the third serving cell that has been activated and the random access procedure was successful. The mobile station apparatus according to claim 11. A base station device in a communication system that reports power headroom indicating the remaining transmission power of a plurality of connected cells connected from a mobile station device to a base station device,
The plurality of serving cells include a first serving cell that is always activated, and a second serving cell that is activated or deactivated having the same transmission timing as the first serving cell, The first serving cell and the third serving cell to be activated or deactivated with different transmission timing,
Requesting the start of a random access procedure by activating the third serving cell set in the mobile station device, and adjusting the transmission timing notified to the mobile station device using the random access procedure The base station apparatus, wherein the power headroom is reported after adjusting the uplink transmission timing of the third serving cell activated based on the information. A base station device in a communication system that reports power headroom indicating the remaining transmission power of a plurality of connected cells connected from a mobile station device to a base station device,
The plurality of serving cells include a first serving cell that is always activated, and a second serving cell that is activated or deactivated having the same transmission timing as the first serving cell, The first serving cell and the third serving cell to be activated or deactivated with different transmission timing,
Requesting the mobile station apparatus to start a random access procedure by activating the third serving cell set in the mobile station apparatus, and after the random access procedure is successful to the mobile station apparatus, the power headroom Base station apparatus characterized in that A power headroom reporting method for a mobile station device in a communication system that reports power headroom indicating the remaining power of transmission power of a plurality of connected cells from a mobile station device to a base station device,
The plurality of serving cells include a first serving cell that is always activated, and a second serving cell that is activated or deactivated having the same transmission timing as the first serving cell, The first serving cell and the third serving cell to be activated or deactivated with different transmission timing,
The base station device activates the third serving cell set in the mobile station device,
The mobile station apparatus adjusts the uplink transmission timing of the third serving cell activated based on the transmission timing adjustment information from the base station apparatus after activating the third serving cell And determining that the power headroom trigger condition is satisfied. A power headroom reporting method for a mobile station device in a communication system that reports power headroom indicating the remaining power of transmission power of a plurality of connected cells from a mobile station device to a base station device,
The plurality of serving cells include a first serving cell that is always activated, and a second serving cell that is activated or deactivated having the same transmission timing as the first serving cell, The first serving cell and the third serving cell to be activated or deactivated with different transmission timing,
The base station device activates the third serving cell set in the mobile station device,
The mobile station apparatus starts a random access procedure when the third serving cell is activated, and determines that a power headroom trigger condition is satisfied when the random access procedure is successful. A featured power headroom reporting method. An integrated circuit mounted on a mobile station device in a communication system that reports power headroom indicating the remaining transmission power of a plurality of connected cells to the base station device from the mobile station device,
The plurality of serving cells include a first serving cell that is always activated, and a second serving cell that is activated or deactivated having the same transmission timing as the first serving cell, The first serving cell and the third serving cell to be activated or deactivated with different transmission timing,
The third serving area activated when the base station apparatus activates the third serving cell and starts the random access procedure and is activated based on the transmission timing adjustment information acquired using the random access procedure. An integrated circuit, characterized by determining that a power headroom trigger condition is satisfied when a cell uplink transmission timing is adjusted. An integrated circuit mounted on a mobile station device in a communication system that reports power headroom indicating the remaining transmission power of a plurality of connected cells to the base station device from the mobile station device,
The plurality of serving cells include a first serving cell that is always activated, and a second serving cell that is activated or deactivated having the same transmission timing as the first serving cell, The first serving cell and the third serving cell to be activated or deactivated with different transmission timing,
The base station apparatus starts a random access procedure when the third serving cell is activated, and determines that a power headroom trigger condition is satisfied when the random access procedure is successful. Integrated circuit.