WO2010122771A1 - 無線通信端末装置、無線通信基地局装置及び無線通信方法 - Google Patents
無線通信端末装置、無線通信基地局装置及び無線通信方法 Download PDFInfo
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- WO2010122771A1 WO2010122771A1 PCT/JP2010/002823 JP2010002823W WO2010122771A1 WO 2010122771 A1 WO2010122771 A1 WO 2010122771A1 JP 2010002823 W JP2010002823 W JP 2010002823W WO 2010122771 A1 WO2010122771 A1 WO 2010122771A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a wireless communication terminal device, a wireless communication base station device, and a wireless communication method.
- UE User Equipment
- This measurement includes intra-frequency measurements, inter-frequency measurements using gaps, and inter-system measurements, and the cellular communication system measures these measurements. Need to support. Note that inter-frequency measurement and inter-system measurement using a gap may be referred to as gap utilization measurement.
- the UE In order to perform the gap utilization measurement, the UE needs to receive a signal from another cell or a different system having a different carrier frequency. Must be adjusted to the frequency or another system. In addition, in order for the UE to measure neighboring cells, a gap (hereinafter also referred to as an idle period) must be provided in the UE.
- a gap hereinafter also referred to as an idle period
- an explicit start position for starting the gap is set.
- the gaps are periodically arranged, and this periodic gap is called a gap pattern.
- This gap pattern needs to be set over a long period in order to perform measurement. Therefore, the UE can support mobility control to another carrier frequency or another system even in a communication state by performing gap utilization measurement based on gap pattern assignment. Furthermore, even when discontinuous reception (DRX) is performed, measurement can be performed only after the gap becomes active.
- DRX discontinuous reception
- the gap is also used when receiving broadcast information (also referred to as “Broadcast information” or “System information”) of a specific cell. Specifically, whether or not there is an access right to a cell that can be accessed only by a specific UE called a CSG (Closed ⁇ ⁇ Subscriber Group) cell, the CSG identifier (CSG identifier) of the cell included in the broadcast information And the accessible CSG identifier list possessed by the UE are also used for the determination. Since the UE cannot receive broadcast information from other cells during communication with the serving base station, the UE uses the gap to acquire broadcast information of other cells.
- broadcast information also referred to as “Broadcast information” or “System information”
- Non-Patent Document 1 a method of measuring using DRX without specifying a gap by explicit signaling, or a CQI value measured without specifying a gap by explicit signaling disclosed in Non-Patent Document 1 is used. Based on this, a method for starting measurement is considered. In the former method, it is not necessary to explicitly set the gap pattern, and the UE can start measurement early.
- Non-Patent Document 1 when the CQI value is smaller than a predetermined threshold or a set threshold, the UE starts a measurement procedure spontaneously by using a gap. . Since the base station receives a CQI report that implies that the UE has started the measurement, it can detect that the UE has started the measurement.
- the former method cannot guarantee a sufficient time slot for the UE to perform measurement because the DRX sleep period, which is a time slot usable for measurement, is not constant. This is because the DRX active period, which is a time slot for the UE to receive data, may be extended (while the UE can successfully decode the PDCCH). That is, the DRX sleep period must be shortened by extending the DRX active period.
- the latter method cannot guarantee sufficient time slots for the UE to perform measurement because the channel quality of the UE changes dynamically. Specifically, when the UE measures using a long gap pattern, the reported CQI value may suddenly change greatly, and the measurement may be terminated or interrupted midway. This increases the complexity of the UE configuration.
- An object of the present invention is to provide a radio communication terminal apparatus, a radio communication base station apparatus, and a radio communication method that reduce the time required for performing handover without increasing the complexity of the configuration of the radio communication terminal apparatus. It is.
- the wireless communication terminal apparatus based on the discontinuous reception active period for receiving data and the length of the offset indicating the time from the start of the discontinuous reception active period to the start of the gap pattern, A gap confirmation means for determining whether to start a gap pattern in a cycle or to start a gap pattern in the next discontinuous reception cycle; and a gap pattern setting means for generating a gap pattern in the determined discontinuous reception cycle;
- the structure which comprises is taken.
- the wireless communication method of the present invention is based on a discontinuous reception active period for receiving data and an offset length indicating a time from the start of the discontinuous reception active period to the start of a gap pattern.
- a gap confirmation step for determining whether to start a gap pattern in the next discontinuous reception cycle or a gap pattern in which the wireless communication terminal generates a gap pattern in the determined discontinuous reception cycle And a setting step.
- movement of UE shown in FIG. The block diagram which shows the structure of UE which concerns on Embodiment 2 of this invention.
- movement which UE shown in FIG. 5 determines a gap information parameter
- FIG. 8 is a flowchart illustrating a method for the UE shown in FIG. 8 to determine a UE-initiated GP information parameter.
- FIG. 8 is a flowchart illustrating a method in which the UE illustrated in FIG. 8 uses UE-driven GP.
- the block diagram which shows the structure of UE which concerns on Embodiment 4 of this invention.
- FIG. 15 is a flowchart showing the operation of the measurement and multiple gap information generation unit shown in FIG.
- FIG. 18 is a flowchart showing the operation of the UE shown in FIG.
- FIG. 1 is a block diagram showing a configuration of UE 100 according to Embodiment 1 of the present invention.
- a receiving unit 101 receives measurement setting information and gap pattern setting information from a network by dedicated control signaling. Examples of such signaling include measurement configuration information included in an RRC connection reconfiguration message defined in 3GPP TS 36.331.
- the receiving unit 101 When receiving the setting information, the receiving unit 101 outputs the measurement setting information to the measuring unit 102 and outputs the set gap pattern parameter to the gap pattern setting unit 104.
- the measurement setting information includes a measurement ID (measurement id) that is an identifier for managing the measurement setting, a measurement object (measurement object) indicating a measurement target system, a frequency, a cell, and the like, and an event for reporting the measurement ( event) etc., and reporting configuration (reporting configuration).
- a measurement ID measurement ID
- measurement object measurement object
- the gap pattern setting information in addition to gap pattern information (gap length, gap period) for measuring different systems and different carrier frequencies, UE-driven for determining the position where the gap starts There is a GP start offset and the like.
- the measurement unit 102 When the measurement unit 102 acquires the measurement setting information output from the reception unit 101, the measurement unit 102 stores the acquired measurement setting information and performs measurement based on an input physical layer reference signal (hereinafter simply referred to as a reference signal). Start.
- the measurement setting information stored in the measurement unit 102 includes both the serving carrier frequency and other carrier frequency setting information (that is, the intra-frequency and inter-frequency measurement settings defined in 3GPP TS 36.331). If so, the measurement unit 102 performs measurement based on the input reference signal.
- the measurement unit 102 can execute a cell search procedure and a serving carrier frequency measurement procedure.
- the measurement unit 102 outputs the serving carrier frequency measurement result to the measurement report generation unit 103.
- events here “the quality of the serving carrier frequency has become worse than a specific threshold”, “a CSG cell has been detected, and it is necessary to receive broadcast information of the CSG cell”, etc. It is.
- the measurement report generation unit 103 includes the measurement result output from the measurement unit 102 in the reporting message and transmits the reporting message to the base station.
- This reporting message may be referred to as a measurement report or an intra frequency measurement report.
- the measurement report generation unit 103 outputs a reporting success notification signal to the gap confirmation unit 105.
- the gap pattern setting unit 104 stores the gap pattern parameters output from the reception unit 101 and outputs the gap pattern parameters to the gap confirmation unit 105.
- the gap pattern parameters can be in different formats depending on the operation and configuration of the network.
- a gap pattern parameter a UE-initiated GP start offset (UE-initiated GP start position, UE-initiated GP) indicating the time from the start of the DRX active period to the start of the UE-initiated gap pattern (hereinafter referred to as “UE-initiated GP”).
- UE-initiated GP UE-initiated GP start position
- UE-initiated GP activation time UE-initiated GP location
- the gap confirmation unit 105 determines a position to start the UE-driven GP based on the gap pattern parameter output from the gap pattern setting unit 104 and the reporting success notification signal output from the measurement report generation unit 103.
- This start position is a position at which the UE 100 starts a gap for performing measurement.
- the gap confirmation unit 105 determines the position where the UE-initiated GP is started based on the relationship between the active period during DRX and the UE-initiated GP start offset.
- the starting point of the UE-initiated GP start offset is a DRX cycle in which a measurement report is successfully transmitted to the base station 200 (one DRX cycle includes one DRX active period and one DRX sleep period subsequent to the DRX active period).
- the UE100 calculates
- the UE 100 confirms whether the extended DRX active period ends before the UE initiated GP start offset at the time of transmitting the measurement report. Depending on whether the extended DRX active period ends before or after the UE initiated GP start offset, the UE 100 performs the following operations.
- the UE 100 When the extended DRX active period ends before the UE initiated GP start offset, the UE 100 is considered that the DRX active period does not overlap with the UE initiated GP in the current DRX cycle. Therefore, the UE 100 activates the UE-initiated GP in the current DRX cycle.
- the UE 100 When the extended DRX active period ends after the UE initiated GP start offset, the UE 100 is considered that the DRX active period overlaps with the UE initiated GP in the current DRX cycle. Therefore, the UE 100 activates the UE-initiated GP in the next DRX cycle.
- the gap confirmation unit 105 determines the timing for making the UE-driven GP active, and outputs the determined timing to the UE-driven GP setting unit 106.
- the UE-initiated GP setting unit 106 determines a position to start UE-initiated GP based on the timing output from the gap confirmation unit 105, and generates a gap pattern accordingly.
- the UE 100 can measure another carrier frequency of another neighboring cell or another system using the UE-initiated GP.
- the UE 100 transmits the measurement result to the base station 200 by the measurement report.
- FIG. 2 is a block diagram showing a configuration of base station 200 according to Embodiment 1 of the present invention.
- the measurement setting unit 201 when it is determined that measurement on another carrier frequency or another system is necessary in the UE 100, the measurement setting unit 201 performs measurement for inter frequency measurement or inter-RAT measurement (inter-RAT measurement). Determine the parameters. These measurement parameters are output to the dedicated signal generation unit 203.
- the gap pattern setting unit 202 determines the UE-initiated GP start offset based on the set idle period (that is, the DRX cycle). Since the UE initiated GP start offset is based on the currently set DRX cycle, the length of the UE initiated GP start offset must not be longer than the set DRX cycle. The UE-initiated GP start offset is intended for the UE 100 to determine the start position of the UE-initiated GP without resulting in overlapping with the DRX active period. The gap pattern setting unit 202 outputs the UE initiated GP start offset to the dedicated signal generation unit 203.
- the dedicated signal generation unit 203 determines a specific UE 100 that is a transmission destination of the set UE-initiated GP start offset and measurement information, and includes downlink dedicated signaling (measurement setting information and UE-initiated GP start offset to the UE 100) ) Is generated. This signaling is output to transmission section 204 and transmitted to UE 100.
- An example of such downlink dedicated signaling is measurement configuration information included in the RRC connection reconfiguration message defined in 3GPP TS 36.331.
- FIG. 3 is a diagram showing a signaling flow between the UE 100 shown in FIG. 1 and the base station 200 shown in FIG.
- the base station first sets gap pattern setting information and measurement setting information.
- the base station transmits the setting information to the UE 100.
- the UE 100 receives and processes the setting information transmitted from the base station 200.
- the UE 100 determines the UE-driven GP setting based on the gap pattern criterion.
- the measurement report generator 103 generates this UE-initiated GP setting information together with the measurement result, and transmits it to the base station 200 through uplink dedicated control signaling (hereinafter also referred to as “measurement report”).
- the gap confirmation unit 105 After the measurement report is normally transmitted to the base station 200, the gap confirmation unit 105 starts UE-driven GP using the set gap pattern parameter (hereinafter also referred to as “UE-driven GP start offset”). .
- the gap confirmation unit 105 determines whether the data resource allocated in the extended DRX active period does not overlap as a result of activating the UE-initiated GP. This determination is made by comparing the length of the extended DRX active period with the length of the UE initiated GP start offset.
- the UE 100 will change the UE-initiated GP after the timing indicated by the UE-initiated GP start offset. Even if it starts in the current DRX cycle, it is considered that the data does not overlap the measurement. Therefore, the UE 100 can start the UE-driven GP immediately before the DRX on period (On-Duration).
- the UE 100 will change the UE-initiated GP after the timing indicated by the UE-initiated GP start offset. Even if it is activated, the DRX active period may overlap with the measurement. Therefore, in order to avoid the occurrence of data and measurement overlap, the UE 100 starts UE-driven GP after the timing indicated by the UE-driven GP start offset in the next DRX cycle.
- the unit of the UE-initiated GP start offset is based on the number of subframes, and the service being executed in the UE 100 is video streaming.
- LTE Long Term Evolution
- 3GPP system 3GPP system
- the UE 100 determines that there is a need to measure another carrier frequency or radio conditions of another system based on the quality of the own frequency, that is, the reporting event criteria due to the quality degradation of the own frequency are satisfied. Then, the evaluated measurement result is included in the measurement report and transmitted to the base station 200.
- the remaining DRX cycle (10 subframes) is longer than the gap length (6 subframes). Therefore, the UE 100 can use the UE-initiated GP without overlapping the DRX active period and the measurement as a result in the current DRX cycle.
- the above method is one method indicating how necessary information (for example, UE initiated GP start offset) is exchanged between the UE 100 and the base station 200 in the present invention, and another method, for example, the base station It is also possible to use signaling by radio resource control and media access control (MAC) between the 200 and the UE 100.
- MAC media access control
- FIG. 4 is a flowchart showing the operation of the UE 100 shown in FIG.
- the measurement report generator 103 transmits the measurement report to the base station 200.
- the gap confirmation unit 105 uses the UE-initiated GP start offset in the DRX active period check procedure to check whether the DRX active period overlaps when the gap pattern starts. Check. If the DRX active period overlaps with the gap pattern (YES), the process proceeds to ST303, and if the DRX active period does not overlap with the gap pattern (NO), the process proceeds to ST304.
- step ST303 the gap confirmation unit 105 determines the position where the gap pattern starts using the length of the UE initiated GP start offset with reference to the starting point of the next DRX cycle.
- the UE 100 starts UE-initiated GP.
- the gap length required for each measurement such as inter-frequency E-UTRA, inter-RAT UTRAN, inter-RAT GERAN, inter-RAT CDMA2000, and gap repetition (gap repetition) (UE) included in the UE-driven GP information parameter
- the UE-initiated GP setting unit 106 starts UE-initiated GP based on the UE-based GP standard).
- the UE-initiated GP is started in the current DRX cycle according to the relationship between the length of the extended DRX active period and the UE-initiated GP start offset, or the next DRX cycle is started.
- the time required for performing the handover can be reduced without increasing the complexity of the configuration of the wireless communication terminal device.
- FIG. 5 is a block diagram showing a configuration of UE 400 according to Embodiment 2 of the present invention.
- FIG. 5 differs from FIG. 1 in that the measurement report generation unit 103 is changed to a measurement and gap information generation unit 401.
- the measurement and gap information generation unit 401 determines a gap information parameter that is information indicating a gap pattern when performing measurement using UE-led GP, and uses this parameter as a reporting message (for example, Measurement report message or other message). ) To the base station.
- the gap information parameter is determined based on information that can be used only in the UE 400, for example, settings that the user individually performs on the terminal, an application that is being executed on the device, or a moving speed of the user.
- the UE 400 can determine a gap pattern to be used when performing measurement using the UE-driven GP according to such a standard. Therefore, the UE 400 can freely set the gap information parameter for determining the gap pattern.
- UE 400 transmits the measurement result to base station 200 by a reporting message.
- This reporting message is also called a measurement report or an intra frequency measurement report as defined in 3GPP TS 36.331.
- this reporting message is referred to as a measurement report.
- the measurement and gap information generation unit 401 When the measurement report is normally transmitted from the UE 400 to the base station 200, the measurement and gap information generation unit 401 outputs a reporting success notification signal to the gap confirmation unit 105.
- the UE 400 can ensure the synchronization of the gap pattern with the base station 200. Therefore, the data does not overlap with the UE-initiated GP, and packet loss does not occur.
- FIG. 6 is a flowchart illustrating an operation in which the UE 400 illustrated in FIG. 5 determines a gap information parameter.
- UE 400 when it is necessary to measure another carrier frequency, UE 400 starts a procedure for determining a gap pattern for performing measurement using UE-driven GP.
- a fading signal serving as an index of the moving speed of the UE 400, an instantaneous quality value of the current serving cell, and the like can be used. Specifically, if the moving speed is high, or if the quality of the current serving cell is poor, etc., it is thought that it is necessary to perform the moving process quickly, so that another carrier frequency or another system is measured quickly. It is.
- the frequency can be changed according to the number of detected CSG cells. For example, when the number of detected CSG cells is large, a large gap for receiving broadcast information is required. Therefore, the frequency of the gap is increased, and when the number of detected CSG cells is small, the broadcast information is received. It is conceivable to reduce the frequency of the gap.
- the UE 400 determines the frequency of measurement using the UE-initiated GP based on the criteria for selecting the gap pattern. Specifically, the frequency with which the UE 400 measures using the UE-initiated GP is determined, and it is determined whether or not the measurement frequency is high. If it is determined that the measurement frequency is higher than the predetermined threshold (YES) due to the moving speed or serving cell quality as described above, the process proceeds to ST503, and if it is determined that the measurement frequency is lower than the predetermined threshold (NO), ST504 Migrate to
- the UE 400 uses the UE-driven GP with a short period so that the measurement frequency using the UE-driven GP increases. Specifically, a short gap period is set with the designated gap length as it is.
- These set gap information parameters include information such as short gap period parameters and gap identification information parameters.
- UE 400 performs measurement using UE-driven GP having a long gap period so that the measurement frequency using UE-driven GP decreases. Specifically, a long gap period is set without changing the designated gap length.
- the UE-initiated GP information parameter includes information such as a long gap period parameter and a gap identification information parameter.
- the UE-driven GP information parameter and the measurement result are generated and included in the measurement report transmitted to the base station 200.
- the purpose of including the UE-initiated GP information parameter in the measurement report is that the UE 400 starts the measurement using the UE-initiated GP based on the specified gap length and the gap period determined by the UE 400. 200 is notified. Therefore, the UE-initiated GP can be synchronized between the base station 200 and the UE 400 by including the UE-initiated GP information parameter in the measurement report.
- the UE 400 When the fading signal indicates the high-speed movement of the UE 400, the UE 400 is expected to have a high possibility of handover (mobility). Therefore, it is necessary to increase the measurement frequency.
- the UE 400 sets a short-period gap pattern and performs measurement more frequently.
- the UE 400 when the fading signal indicates the low-speed movement of the UE 400, the UE 400 is expected to have a low possibility of handover. Therefore, it is possible to reduce the measurement frequency.
- the UE 400 sets a long-period gap pattern and performs measurement with less frequency.
- the UE 400 When the instantaneous quality value has deteriorated, the UE 400 is expected to have a poor reception state from the base station 200. This means that the UE 400 needs to perform a handover to ensure connectivity. Therefore, it is necessary to increase the measurement frequency, and the UE 400 sets a short period gap pattern.
- the UE 400 sets a long-period gap pattern and performs measurement with less frequency.
- FIG. 7 is a diagram showing a signaling flow between the UE 400 shown in FIG. 5 and the base station 200 shown in FIG. This figure demonstrates the case where the synchronization of a gap pattern is ensured between UE400 and the base station 200.
- FIG. 7 is a diagram showing a signaling flow between the UE 400 shown in FIG. 5 and the base station 200 shown in FIG. This figure demonstrates the case where the synchronization of a gap pattern is ensured between UE400 and the base station 200.
- the base station 200 sets gap pattern setting information and measurement setting information using RRC (Radio Resource Control).
- the base station 200 transmits the setting information from the transmission unit 204 to the UE 400.
- the UE 400 receives the message transmitted from the base station 200 and processes the setting information.
- the UE 400 determines the UE-initiated GP setting based on the gap pattern criterion.
- the measurement and gap information generation unit 401 generates the UE-initiated GP setting information and the evaluated measurement result, and transmits them to the base station 200 by uplink dedicated control signaling.
- the gap confirmation unit 105 uses the set gap pattern parameter (UE-initiated GP start offset) to set the gap of the UE-initiated GP. Perform verification.
- the gap confirmation unit 105 determines whether or not the gap overlaps with the DRX active period when the UE-driven GP is started. This determination is made by comparing the length of the extended DRX active period with the length of the UE initiated GP start offset. Since this operation is the same as that described in the first embodiment, a description thereof will be omitted.
- the UE determines the gap period according to the guidelines indicated by the base station.
- the UE it is also possible to notify the UE of gap cycle candidates from the base station side. Specifically, when three or more gap periods are prepared for standardization, it is possible to notify the UE of which gap period to select. In 3GPP LTE, which is currently standardized, two periods of 40 ms and 80 ms are defined. Therefore, the UE according to Embodiment 2 of the present invention only selects 40 ms or 80 ms. However, since a gap period of 20 ms or 160 ms may be added in the future, it is possible to cause the UE to make a selection suitable for the operation of the base station by narrowing down candidates.
- the UE initiative of a short cycle is performed.
- the measurement frequency can be increased by using GP to prepare for handover, and when the UE reception state is good, the measurement frequency is reduced by using a UE-driven GP with a long period and the power consumption of the UE is reduced. can do.
- FIG. 8 is a block diagram showing a configuration of UE 600 according to Embodiment 3 of the present invention. 8 differs from FIG. 1 in that the gap pattern setting unit 104 is deleted, the measurement report generation unit 103 is changed to a measurement and UE-driven GP information generation unit 601, and the gap confirmation unit 105 is changed to a UE-driven GP confirmation unit 602. This is a change.
- the measurement and UE-driven GP information generation unit 601 When the measurement reporting standard is satisfied, the measurement and UE-driven GP information generation unit 601 generates each setting information and includes the information in the measurement report. Further, the measurement and UE-initiated GP information generation unit 601 determines UE-initiated GP period parameters including the time required for CQI reporting from the UE 600, sets the determined UE-initiated GP period parameters, and measures the setting information. It is included in the report and transmitted to the base station 200. When a measurement report is transmitted within the extended DRX active period, a reporting notification is output to the UE-initiated GP confirmation unit 602.
- the UE-initiated GP confirmation unit 602 confirms whether the UE-initiated GP starts in the current DRX or the next DRX cycle using the UE-initiated GP period parameter. When the position for starting the UE-initiated GP is determined based on the UE-initiated GP period parameter, the UE-initiated GP confirmation unit 602 sets the UE-initiated GP.
- FIG. 9 is a diagram showing a signaling flow between UE 600 shown in FIG. 8 and base station 200 shown in FIG.
- FIG. 9 shows an example in which the UE 600 determines the UE-initiated GP period parameter and confirms whether the UE-initiated GP starts in the current DRX cycle or the next DRX cycle.
- the UE 600 stores the measurement setting information and performs measurement by processing in the measurement unit 102.
- the UE 600 determines a UE-initiated GP period parameter based on the criterion for determining the UE-initiated GP, and sets a gap information parameter.
- the criteria is based on the time required for the measurement required to report the channel quality indicator (CQI) and the gap length specified for the measurement. Specifically, when the channel quality indicator report is in the first subframe of DRX active, the time required for the channel quality indicator report and the sum of the gap length specified for the measurement become. When the channel quality indicator report is in two subframes from the beginning of DRX active, one subframe is calculated from the sum of the time required for the channel quality indicator report and the gap length specified for the measurement. Subtracted value.
- the UE-initiated GP period parameter can be determined using an operation related to the CQI report interval in the UE 600 (for example, the position of the CQI report in the DRX on period).
- the measurement and UE-initiated GP information generation unit 601 transmits the measurement report including the UE-initiated GP information parameter and the measurement result to the base station 200 as defined in 3GPP TS 36.331. To do.
- the UE 600 confirms the DRX cycle in which the UE-initiated GP can be started using the UE-initiated GP period parameter.
- the UE-initiated GP confirmation unit 602 activates the UE-initiated GP immediately before the beginning of the DRX on period based on the following conditions.
- Condition # 1 (see FIG. 9A): (Set DRX cycle ⁇ (DRX active period in which measurement report including UE-initiated GP information parameter is sent))> UE-initiated GP period
- Condition # 2 (see FIG. 9B): (Set DRX cycle-(DRX active period in which measurement report including UE-initiated GP information parameter is sent)) ⁇ UE-initiated GP period
- a measurement report is sent that includes a UE-initiated GP information parameter, and the length of the extended DRX active period does not overlap with the length of the UE-initiated GP period parameter relative to the origin of the DRX on period in the next DRX cycle
- the UE 600 is considered that the DRX active period does not overlap with the measurement when the UE initiated GP is started. Accordingly, UE 600 initiates UE initiated GP at a position where the remaining time in the current DRX cycle is equal to the length of the UE initiated GP period parameter, as shown as condition # 1 in FIG. 9A.
- UE600 When a measurement report including a UE-initiated GP information parameter is transmitted, and the length of the extended DRX active period overlaps with the length of the UE-initiated GP period parameter with respect to the origin of the DRX on period in the next DRX cycle , UE600 is considered that the DRX active period overlaps the measurement when UE initiated GP is started. Accordingly, UE 600 initiates UE initiated GP at a position where the remaining time in the next DRX cycle is equal to the length of the UE initiated GP period parameter, as indicated as condition # 2 in FIG. 9B.
- the measurement and UE-initiated GP information generation unit 601 determines UE-initiated GP repetition based on the measurement request level, and outputs gap repetition setting information to the UE-initiated GP confirmation unit 602.
- the UE-initiated GP confirmation unit 602 determines a UE-initiated GP period parameter based on a reference list for selecting the UE-initiated GP, and confirms a position where the UE-initiated GP is started.
- the UE-initiated GP confirmation unit 602 can determine the length of the UE-initiated GP period parameter using the CQI report interval (for example, the position of the CQI report in the DRX on period) in the UE 600.
- the UE-initiated GP confirmation unit 602 determines the UE-initiated GP period parameter
- the UE-initiated GP period parameter is measured and output to the UE-initiated GP information generation unit 601.
- the UE 600 includes these setting parameters in the measurement report and transmits them to the base station 200.
- the base station 200 can be notified of the position where the UE 600 starts the UE-initiated GP.
- FIG. 11 is a flowchart illustrating a procedure for determining a position where the UE 600 starts the UE-initiated GP in the current or next DRX cycle.
- the same reference numerals as those in FIG. 11 the same reference numerals as those in FIG.
- the UE initiated GP confirmation section 602 uses the UE initiated GP period parameter in the DRX active period check procedure to confirm whether the DRX active period overlaps with the gap and starts UE initiated GP To decide. If the DRX active period overlaps with the UE-initiated GP (YES), the process proceeds to ST802. If the DRX active period does not overlap with the UE-initiated GP (NO), the process proceeds to ST304.
- the UE-initiated GP confirmation unit 602 uses the length of the UE-initiated GP period parameter when the starting point of the DRX on period in the next DRX cycle is used as a reference as a position to start the UE-initiated GP.
- the UE-initiated GP is currently set according to the relationship between the UE-initiated GP period parameter including the time required for CQI report from the UE 600 and the length of the extended DRX active period.
- FIG. 12 is a block diagram showing a configuration of UE 900 according to Embodiment 4 of the present invention.
- FIG. 12 is different from FIG. 1 in that the measurement report generation unit 103 is changed to a measurement and gap information generation unit 901 and the gap confirmation unit 105 is changed to a gap correction confirmation unit 902.
- the measurement and gap information generation unit 901 generates setting information from the UE-driven GP information parameter and the measurement result output from the measurement unit 102, and includes the setting information in the measurement report.
- the measurement and gap information generation unit 901 does not transmit the measurement report to the base station 200 and outputs this setting information to the gap correction confirmation unit 902.
- the gap correction confirmation unit 902 starts UE-driven GP based on the reference list.
- the gap correction confirming unit 902 uses the UE initiated GP start offset stored in the gap pattern setting unit 104 to start the UE initiated GP.
- the UE 900 evaluates whether to transmit the measurement report to the base station 200 based on the transmission standard. If the transmission criteria are satisfied, the UE 900 sets the UE-initiated GP information parameter and transmits it to the base station 200 through the measurement report. When the transmission criteria are not satisfied, the UE 900 does not transmit the measurement report to the base station 200 as illustrated in FIG.
- the transmission standard is the presence / absence of other data to be transmitted / received, the length of the DRX cycle, and the like. For example, when there is other data to be transmitted / received, transmission does not increase power consumption, but when there is no other data to be transmitted / received, transmission is not performed to reduce power consumption. desirable. Also, when the DRX cycle is short, power transmission does not increase even if transmission / reception is performed, but when the DRX cycle is long, it is desirable not to perform transmission in order to reduce power consumption.
- the UE 900 can start measurement using the UE-initiated GP regardless of whether or not to send a measurement report even when using a service with a long DRX configuration. Can do.
- FIG. 13 is a diagram showing a signaling flow between UE 900 shown in FIG. 12 and base station 200 shown in FIG.
- FIG. 13 shows an example in which UE 900 has established a long DRX setting service and starts UE-driven GP regardless of whether or not to immediately send a measurement report.
- the UE 900 stores the measurement setting information, and performs measurement by processing in measurement unit 102.
- the UE 900 immediately starts measurement using the initiating UE-initiated GP.
- the criterion for starting the UE-driven GP can be based on a threshold set for the radio quality of the serving cell. For example, when the radio quality of the serving cell of UE 900 falls below a threshold, UE 900 starts UE-initiated GP in the current DRX cycle.
- the UE 900 sets the UE-initiated GP information parameter and defines it as defined in 3GPP TS 36.331 so that the base station 200 can synchronize the start of the gap pattern for measurement with the UE 900. It is also determined whether it is necessary to transmit to the base station 200 through the measurement report. That is, whether the UE 900 needs to send a measurement report is: 1) if the UE 900 is required to perform downlink data or uplink data resumption, or 2) if the UE 900 DRX active period is If it is expected to overlap with the UE-initiated GP, it can be determined based on. Furthermore, the UE 900 transmits the measurement report using the random access procedure for transmitting the measurement report only when it is determined that synchronization with the base station 200 is necessary.
- FIG. 14 is a flowchart showing the operation of the gap correction confirmation unit 902 shown in FIG. 14, in ST1001, the gap correction confirmation section 902 acquires UE-driven GP information parameters and measurement results, and based on the criteria of UE-driven GP in long DRX, the UE 900 itself uses another UE-driven GP to generate another carrier. Determine if frequency measurement needs to be started.
- the UE-driven GP in long DRX can be controlled based on a threshold set for the radio quality of the serving cell.
- the UE 900 starts UE-initiated GP based on the UE-initiated GP start offset.
- ST1002 it is determined whether there is an uplink resource that can be used to transmit the measurement report to the base station 200. If the uplink resource is available (YES), the process moves to ST1003, and if the uplink resource is not available (NO), the process moves to ST1004.
- a measurement report including UE-initiated GP information parameters is transmitted to base station 200, and in UE1004, UE-initiated GP is started.
- the UE-driven GP is started regardless of whether or not the measurement report is transmitted.
- the time required for performing the handover can be shortened without increasing the complexity of.
- FIG. 15 is a block diagram showing a configuration of UE 1100 according to Embodiment 5 of the present invention.
- FIG. 15 differs from FIG. 1 in that the measurement report generation unit 103 is changed to a measurement and gap information generation unit 1101.
- the measurement and gap information generation unit 1101 determines the period of the UE-driven GP based on the measurement frequency. Further, when different measurement types are set by the base station 200, the UE 1100 determines an appropriate gap length for the set measurement type.
- FIG. 16 is a diagram illustrating a signaling flow between the UE 1100 illustrated in FIG. 15 and the base station 200 illustrated in FIG. This figure shows a signaling flow when the UE 1100 uses a plurality of gap lengths.
- the UE 1100 determines the measurement request level and the length of each gap used for the measurement. This is because the UE 1100 uses different gap lengths for different measurements. Specifically, in the case of measurement of inter-frequency E-UTRA, inter-RAT UTRAN, inter-RAT GERAN, etc., the UE 1100 performs measurement using a common gap length. For other measurements (eg, WiMAX), the UE 1100 performs measurements using different gap lengths. That is, the UE 1100 can determine an appropriate gap length for the measurement using the UE-driven GP based on the set measurement type.
- the measurement unit 102 of the UE 1100 determines the gap length based on the set information.
- the UE 1100 sets a gap length parameter and includes this information in the UE initiated GP information parameter included in the measurement report. Accordingly, the UE 1100 activates the UE-initiated GP having an appropriate gap length and an appropriate gap repetition and transmits it to the base station 200 through the measurement report.
- the UE 1100 When the UE 1100 activates the UE-driven GP using an appropriate gap repetition and gap length as shown in FIG. 16, the UE 1100 sets those gap-related parameters in the UE-driven GP information parameter, Transmit to station 200. Thereby, the synchronization of UE initiative GP can be maintained and guaranteed between base station 200 and UE1100.
- FIG. 17 is a flowchart showing the operation of the measurement and gap information generation unit 1101 shown in FIG.
- the same reference numerals as those in FIG. 17, in ST1201 it is determined whether the gap length of the UE-initiated GP is optimal with a short gap length. If measurement types such as inter-frequency E-UTRA, inter-RAT UTRAN, inter-RAT GERAN, and inter-RAT CDMA2000 are set, and a short gap length is optimal (YES), the process proceeds to ST1202. On the other hand, when a measurement type such as WiMAX is set and a long gap length is optimal (NO), the process proceeds to ST1203.
- a short gap length is used for UE-driven GP.
- a long gap length is used for UE-driven GP.
- the fifth embodiment by determining the gap length according to the measurement type, even when the time required for measurement differs for each measurement type, measurement is performed using an appropriate length of the gap length. Therefore, it is possible to eliminate an excess or deficiency of the gap length with respect to the time required for measurement, and to shorten the time required for performing the handover.
- HARQ Hybrid Auto Repeat reQuest
- FIG. 18 is a block diagram showing a configuration of UE 1300 according to Embodiment 6 of the present invention.
- FIG. 18 differs from FIG. 1 in that the measurement report generation unit 103 is changed to a measurement report generation unit 1301 and the gap confirmation unit 105 is changed to a gap candidate selection / determination unit 1302.
- the measurement report generation unit 1301 excludes the reporting success notification signal that was an input to the measurement report generation unit 103, and the input to the gap candidate selection / determination unit 1302 is not a reporting success notification signal but a reporting It differs from the measurement report generator 103 in that it is an execution notification signal.
- the gap candidate selection / determination unit 1302 determines a position to start the UE-driven GP based on the gap pattern parameter output from the gap pattern setting unit 104 and the reporting execution notification signal output from the measurement report generation unit 1301.
- the start position is a position where the UE 1300 starts a gap for performing measurement.
- the gap candidate selection / determination unit 1302 determines the position where the UE-initiated GP is started using the UE-initiated GP creation timing set in the UE.
- the UE-driven gap creation timing set for this UE is included in the gap pattern parameter output from the gap pattern setting unit 104 in the present embodiment.
- the UE-initiated GP creation timing is explicitly indicated by a system frame number (hereinafter referred to as “SFN (System Frame ⁇ Number) ”) or a subframe.
- SFN System Frame ⁇ Number
- SFN mod 10 From the subframe 5 of the SFN that becomes 3, and so on.
- the gap length and gap repetition control are determined in the same manner as the gap confirmation unit 105.
- FIG. 19 is a flowchart showing the operation of the UE 1300 shown in FIG. In this figure, in ST1401, an event in which the measurement report generator 1301 transmits a measurement report to the base station is triggered. As a result, reporting is also triggered.
- the gap candidate selection / determination section 1302 confirms whether or not UE-driven GP creation timing is set based on a reporting execution notification signal from the measurement report generation section 1301. If the UE-initiated GP creation timing is set (YES), the process proceeds to ST1403. If the UE-initiated GP creation timing is not set (NO), the UE-initiated GP cannot be created, and the process ends.
- the gap candidate selection / determination section 1302 determines the next UE-driven GP creation timing as the location of the UE-driven GP.
- FIG. 20 is a diagram showing a signaling flow for the UE 1300 shown in FIG.
- the base station first sets gap pattern setting information and measurement setting information.
- the base station transmits the setting information to the UE 1300.
- the UE 1300 receives and processes the setting information transmitted from the base station.
- the point that the UE-driven GP creation timing is received as the gap pattern setting information is different from FIG.
- the UE 1300 determines the UE-initiated GP from the UE-initiated GP creation timing received from the base station. Also, the UE 1300 transmits a measurement report to the base station.
- the UE-initiated GP is created after the measurement report is transmitted, but the UE-initiated GP may be started first.
- transmitting a measurement report is not an essential requirement for creating a UE-driven GP. Therefore, it is possible not to send a measurement report.
- the quality of the serving carrier frequency has become lower than a specific threshold value, ”“ the CSG cell is detected and it is necessary to receive broadcast information of the CSG cell. ”
- reporting is not performed first, but the broadcast information of the CSG cell is received and the CSG cell is received.
- CGI Cell global Identifier
- CSG ID CSG identifier
- the gap of 80 ms is necessary is that the broadcast information including CGI, CSG ID, SIB1 (System Information Block Type 1) is transmitted once every 20 ms, and the UE with poor reception quality is This is because it is considered to improve the quality by receiving and synthesizing it four times.
- the above-described SIB1 reception operation is shown in more detail in FIG.
- an MIB Master Information Block
- the location of the MIB is determined to be the first subframe of all radio frames (Radio frame: 10 ms interval and 10 subframes).
- This MIB includes SFN.
- SIB1 is transmitted in the sixth subframe of even SFN. Therefore, the transmission timing of SIB1 is known after receiving the MIB.
- reception combining may be performed four times. Therefore, it is conceivable to provide an 80 ms gap as shown as case 1 in FIG. As a result, the MIB is received, the transmission timing of SIB1 is detected, and then the SIB1 reception is performed until reception is successful.
- the UE can know at what timing the CSG cell transmits SIB1. Therefore, as shown in case 2, it is also conceivable to provide a gap only in a necessary portion of the 80 ms gap. In such a case, in a place where there is no gap, the UE can transmit and receive with the base station to which it originally connected.
- FIG. 21 shows an example in which the reception is successful in the third SIB1 reception.
- movement which combined the case 2 and case 3 of FIG. 21 is also possible.
- the UE even when the UE does not implement DRX, it can be implemented. This is because the location where the UE performs UE-initiated GP is predictable for the base station regardless of the DRX operation.
- the measurement report may be a measurement report message (Measurement report message) defined as an RRC message as described above, a MAC control message, or a layer 1 message.
- a CQI report or the like can be considered as a layer 1 message.
- UE-initiated GP creation timing using an identifier assigned to each UE.
- UE User Equipment
- IMSI InternationalIMMode Subscriber Identity
- C-RNTI Cell Radio Network Temporary Identifier
- S-TMSI SAE Temporary Mobile Station Identifier
- the setting is transmitted by broadcast information or a rule is determined in advance, it may be possible to control the on / off of this operation for each UE or for each cell. Specifically, when it is performed for each UE, it is possible to notify on or off with an individual message, and when it is performed for each cell, it is notified of on or off with broadcast information. Is possible.
- the CSG cell is indicated as being detected in each of the above embodiments, a plurality of forms are conceivable. Specifically, (1) when physical identification information (Physical Cell Identifier) of a cell decided to be used for CSG is detected, (2) of a cell decided to be used for CSG When physical identification information is detected and the quality of the CSG cell is above a certain level or included within a specific number of higher ranks, (3) physical identification information of a cell that is determined to be used for CSG And the physical identification information of the cell seems to be accessible to the UE, (4) it can be assumed that there is a CSG cell from the location information of the UE, and (1) to (4) The case where it combines is considered.
- Physical Identification information Physical Cell Identifier
- GPS Global Positioning System
- information on other cells that can be received by the UE may be stored.
- the UE-driven GP creation shown in the present embodiment may be canceled or postponed due to competition of other operations.
- a scheduling method called semi-persistent scheduling for services that regularly transmit at a relatively small data rate such as voice communication.
- the timing at which the UE should transmit or receive is determined in advance, and transmission / reception is performed at that timing. If this semi-fixed allocation is set for the UE and UE-driven GP creation is performed, if both occur simultaneously, it is necessary to prioritize one of them. In that case, priority may be given to semi-fixed allocation.
- the measurement report may not be sent. However, whether or not the measurement report is sent may be determined based on the delay required to create the UE-driven GP. Specifically, if UE-driven GP creation can be created within a specific time, the measurement report is not sent, and if it takes more than a specific time, the measurement report is sent and the base station allocates a gap. It is conceivable to encourage movement. It should be noted that the specific time here may be determined to be a fixed value in the system, may be notified by broadcast information or the like, or in order to consider the service used by the UE, etc. You may make it transmit separately for every.
- each functional block used in the description of each of the above embodiments is typically realized as an LSI which is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them.
- the name used here is LSI, but it may also be called IC, system LSI, super LSI, or ultra LSI depending on the degree of integration.
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor.
- An FPGA Field Programmable Gate Array
- a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.
- the radio communication terminal apparatus, radio communication base station apparatus, and radio communication method according to the present invention can be applied to, for example, a mobile communication system.
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Abstract
Description
図1は、本発明の実施の形態1に係るUE100の構成を示すブロック図である。この図において、受信部101は、測定設定情報及びギャップパターン設定情報を専用の制御シグナリングによってネットワークから受信する。このようなシグナリングの例としては、3GPP TS 36.331に定義されているRRC接続再設定(RRC Connection Reconfiguration)メッセージに含まれる測定設定(Measurement Configuration)情報がある。受信部101は、これらの設定情報を受信すると、測定設定情報を測定部102に出力し、設定されたギャップパターンパラメータをギャップパターン設定部104に出力する。
UE主導GP開始オフセット=25サブフレーム
DRXサイクル=40サブフレーム
DRXオン期間=10サブフレーム
DRX非アクティブタイマー=5サブフレーム
DRX開始タイミング=5番目のサブフレーム
UE主導GPの開始タイミング=DRX開始タイミング+UE主導GP開始オフセット=5+25=30番目のサブフレーム
UE主導GP開始オフセットによって示されるタイミングより前に、延長されたDRXアクティブ期間が先に終了するため、UE100は、図示したように現在のDRXサイクル内においてUE主導GPをアクティブにする。
このように、残りのDRXサイクル(10サブフレーム)は、ギャップ長(6サブフレーム)より長い。したがって、UE100は、現在のDRXサイクルにおいて、結果としてDRXアクティブ期間と測定とが重なることなく、UE主導GPを使用することができる。
図5は、本発明の実施の形態2に係るUE400の構成を示すブロック図である。図5が図1と異なる点は、測定レポート生成部103を測定及びギャップ情報生成部401に変更した点である。
図8は、本発明の実施の形態3に係るUE600の構成を示すブロック図である。図8が図1と異なる点は、ギャップパターン設定部104を削除し、測定レポート生成部103を測定及びUE主導GP情報生成部601に変更し、ギャップ確認部105をUE主導GP確認部602に変更した点である。
条件#2(図9B参照):(設定されているDRXサイクル-(UE主導GP情報パラメータを含む測定レポートが送られたDRXアクティブ期間))≦UE主導GP期間
図12は、本発明の実施の形態4に係るUE900の構成を示すブロック図である。ただし、図12が図1と異なる点は、測定レポート生成部103を測定及びギャップ情報生成部901に変更し、ギャップ確認部105をギャップ修正確認部902に変更した点である。
図15は、本発明の実施の形態5に係るUE1100の構成を示すブロック図である。図15が図1と異なる点は、測定レポート生成部103を測定及びギャップ情報生成部1101に変更した点である。
本発明の実施の形態6では、UEが上記実施の形態と異なる方法でギャップを生成する方法を示す。図18は、本発明の実施の形態6に係るUE1300の構成を示すブロック図である。図18が図1と異なる点は、測定レポート生成部103を測定レポート生成部1301に変更した点と、ギャップ確認部105をギャップ候補選択・決定部1302に変更した点である。
102 測定部
103、1301 測定レポート生成部
104、202 ギャップパターン設定部
105 ギャップ確認部
106 UE主導GP設定部
201 測定設定部
203 専用信号生成部
204 送信部
401、901 測定及びギャップ情報生成部
601 測定及びUE主導GP情報生成部
602 UE主導GP確認部
902 ギャップ修正確認部
1101 測定及びギャップ情報生成部
1302 ギャップ候補選択・決定部
Claims (8)
- データを受信する不連続受信アクティブ期間と、前記不連続受信アクティブ期間の開始からギャップパターンの開始までの時間を示すオフセットの長さとに基づいて、現不連続受信サイクルにおいてギャップパターンを開始するか、または次の不連続受信サイクルにおいてギャップパターンを開始するかを決定するギャップ確認手段と、
決定された不連続受信サイクルにおいてギャップパターンを生成するギャップパターン設定手段と、
を具備する無線通信端末装置。 - 自装置における受信状態に応じて、ギャップパターンの周期を制御することにより、サービングセル以外の隣接セルにおける周波数を測定する頻度を制御すると共に、制御した前記ギャップパターンの周期をサービングセルにおける無線通信基地局装置に通知するギャップ情報生成手段を具備する請求項1に記載の無線通信端末装置。
- 前記ギャップ確認手段は、自装置からのCQI報告に要する時間を含めたギャップパターン期間パラメータと、前記不連続受信アクティブ期間とに基づいて、ギャップパターンを開始する不連続受信サイクルを決定する請求項1に記載の無線通信端末装置。
- 前記ギャップ確認手段は、サービングセルの無線品質が所定の閾値を下回った場合、ギャップパターンを開始することを決定する請求項1に記載の無線通信端末装置。
- 前記ギャップ情報生成手段は、測定対象を示す測定タイプに応じて、前記ギャップパターンのギャップ長を決定する請求項1に記載の無線通信端末装置。
- 設定されている不連続受信サイクルに基づいて、不連続受信アクティブ期間の開始からギャップパターンの開始までの時間を示すオフセットを設定するギャップパターン設定手段と、
設定された前記オフセットを送信先である無線通信端末装置を特定して送信する送信手段と、
を具備する無線通信基地局装置。 - 前記ギャップパターン設定手段は、前記無線通信端末装置から送信されたギャップパターンのパラメータを受信し、前記ギャップパターンを前記無線通信端末装置との間で同期する請求項6に記載の無線通信基地局装置。
- データを受信する不連続受信アクティブ期間と、前記不連続受信アクティブ期間の開始からギャップパターンの開始までの時間を示すオフセットの長さとに基づいて、現不連続受信サイクルにおいてギャップパターンを開始するか、または次の不連続受信サイクルにおいてギャップパターンを開始するかを決定するギャップ確認ステップと、
決定された不連続受信サイクルにおいて無線通信端末装置がギャップパターンを生成するギャップパターン設定ステップと、
を具備する無線通信方法。
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Also Published As
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US20120033595A1 (en) | 2012-02-09 |
JPWO2010122771A1 (ja) | 2012-10-25 |
US8817681B2 (en) | 2014-08-26 |
JP5490105B2 (ja) | 2014-05-14 |
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