WO2011025205A2 - 이동통신 시스템에서 방송 제어 채널 송수신 방법 및 장치 - Google Patents
이동통신 시스템에서 방송 제어 채널 송수신 방법 및 장치 Download PDFInfo
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- WO2011025205A2 WO2011025205A2 PCT/KR2010/005613 KR2010005613W WO2011025205A2 WO 2011025205 A2 WO2011025205 A2 WO 2011025205A2 KR 2010005613 W KR2010005613 W KR 2010005613W WO 2011025205 A2 WO2011025205 A2 WO 2011025205A2
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- control channel
- broadcast control
- log information
- reception
- information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
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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
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/32—TPC of broadcast or control channels
- H04W52/322—Power control of broadcast channels
Definitions
- a mobile station in order to optimize the reception performance of a broadcast control channel (BCCH), stores a cause of BCCH reception failure or the number of packet combining for BCCH reception, and reports it to a base station. And a method and apparatus for automatically optimizing transmission parameters.
- BCCH broadcast control channel
- a mobile communication system has been developed for the purpose of providing communication while securing user mobility.
- Such a mobile communication system has reached a stage capable of providing high-speed data communication service as well as voice communication due to the rapid development of technology.
- LTE Long Term Evolution
- SON Self-Organizing Networks
- the system automatically optimizes system resources and related parameters based on statistical data from the terminal or the network's own measurement without the network test performed by the operator.
- system parameters There are many system parameters in the mobile communication system, and these values should be set appropriately so that the reception performance of various channels can be optimized. For this task, the characteristics of various signals must be measured for each channel in the service area of the wireless network.
- the broadcast control channel reception method of the base station according to the present invention for solving the above problems, the process of transmitting a broadcast control channel according to a transmission parameter set in advance, and the process of collecting log information indicating whether the reception of the broadcast control channel successful; And resetting the transmission parameter by analyzing the log information.
- the broadcast control channel transmission apparatus of the base station for solving the above problems, a broadcast control channel generator for generating a broadcast control channel according to the transmission parameters set in advance, and transmits the broadcast control channel, And a transceiver for receiving log information indicating whether the broadcast control channel has been successfully received, and a log information analyzer for collecting the log information and analyzing the log information to reset the transmission parameters. .
- the broadcast control channel reception method of a terminal for solving the above problems, when receiving a broadcast control channel transmitted according to a transmission parameter preset by a base station, recording log information indicating whether the broadcast control channel reception success or failure; And feeding back the log information to the base station to reset the transmission parameters by analyzing the log information.
- the broadcast control channel receiving apparatus of the terminal for solving the above problems, a channel for determining whether the reception of the broadcast control channel is successful when receiving a broadcast control channel transmitted in accordance with a preset transmission parameter from the base station
- An analysis unit a log information storage unit for recording log information according to whether the broadcast control channel has been successfully received, and under the control of the channel analyzer, the broadcast control channel is received and the log information is analyzed to determine the transmission parameters.
- a transceiver for feeding back the log information to the base station to reset.
- the terminal in order to optimize the reception performance of the BCCH, stores BCCH reception failure information or packet combining number information for BCCH reception, reports the result to the base station, and automatically transmits transmission parameters. Can be optimized
- 1 is a diagram illustrating a channel mapping relationship between a BCCH and a lower layer.
- FIG. 2 is a diagram illustrating a MIB and SIB receiving process
- FIG. 3 is a view for explaining the overall process according to a first embodiment of the present invention.
- FIG. 5 is a functional block diagram of a terminal according to the first embodiment of the present invention.
- FIG. 6 is an operation flowchart of a base station according to the first embodiment of the present invention.
- FIG. 7 is a functional block diagram of a base station according to the first embodiment of the present invention.
- FIG. 9 is an operation flowchart of a terminal according to a second embodiment of the present invention.
- FIG. 10 is a functional block diagram of a terminal according to a second embodiment of the present invention.
- FIG. 11 is an operation flowchart of a base station according to the second embodiment of the present invention.
- FIG. 12 is a functional block diagram of a base station according to the second embodiment of the present invention.
- FIG. 13 is a view for explaining a scenario that requires the exchange of log information between base stations according to a third embodiment of the present invention.
- 15 is an operation flowchart of a base station according to the third embodiment of the present invention.
- the broadcast control channel is one of logical channels of a LTE mobile communication system and is used to convey system information.
- the system information is information required for the terminal to connect with the base station and is divided into a master information block (MIB) and a system information block (SIB) according to the nature of the information.
- the MIB includes the most essential physical information such as a frequency band and a system frame number (SFN).
- SIBs exist from SIB1 to SIB11 according to actual information.
- SIB1 has cell selection and scheduling information of system information, and SIB2 includes common and shared channel information.
- SIB3 to SIB8 include intra-frequency, inter-frequency, inter-RAT cell reselection information.
- the remaining SIB9 has a HeNB ID, and the SIB10 to SIB11 have Earthquake and Tsunami Warning System (ETWS) notification information.
- EWS Tsunami Warning System
- a logical channel 105 is used to exchange packets between an RLC layer and a MAC layer, and a transport channel 115 is used to exchange packets between a MAC layer and a PHY layer. Used for.
- the physical channel 130 is used for transmitting and receiving packets in a wireless medium.
- System information transmitted from the BCCH 110 of the logical channel 105 is classified according to its characteristics, and is transmitted from the base station to the terminal through the channels of the lower layer.
- the MIB is delivered to BCH (Broadcast Channel) 120, which is one of the transport channels.
- the SIB is delivered on a downlink shared channel (DL-SCH), which is a transport channel.
- DL-SCH downlink shared channel
- the BCH 120 and the DL-SCH 125 are mapped to a physical broadcast channel (PBCH) 135, which is a physical channel, and a physical downlink shared channel (PDSCH, 140), respectively.
- PBCH physical broadcast channel
- PDSCH physical downlink shared channel
- the Physical Downlink Control Channel (PDCCH) 145 informs scheduling information of the SIB delivered to the radio resource of the PDSCH 140. Therefore, the PDCCH 145 must be correctly decoded to obtain the SIB.
- PBCH physical broadcast channel
- PDSCH physical downlink shared channel
- the PBCH 205 is transmitted on 72 carriers (subcarriers) centered on the center of the frequency band and has MIB information.
- the MIB is transmitted in a 40 ms period, and the same information is repeated every 10 ms by applying time diversity within the 40 ms period.
- Resource block information in the PDSCHs 215 and 220 through which the SIB is transmitted is transmitted to the PDCCH 210.
- the PDCCH 210 which is CRC checked with SI-RNTI, informs scheduling information on the frequency axes of PDSCHs 215 and 220, that is, SIB1 to SIB11.
- the SIB1 215 is repeated every 80 ms, similar to the MIB, and is transmitted in a fifth subframe within a radio frame.
- SIB1 informs scheduling information on the time axis of SIB2 to SIB11. Accordingly, the SIB2 to SIB11 can be decoded using the scheduling information provided by the PDCCH 210 and the SIB1. That is, in order to accurately obtain the system information of the BCCH, the PBCH 205, the PDSCHs 215, 220, and the PDCCH 210, which are physical channels, must all be decoded correctly.
- the present invention is a method for optimizing the transmission parameters by the terminal stores the information on the failure of BCCH reception or the number of coupling for BCCH reception in order to optimize the reception performance of the BCCH in the LTE mobile communication system; And to an apparatus.
- the present invention develops a time point for storing specific information, information to be stored, terminal and base station operations for optimization of BCCH transmission.
- the terminal When the terminal successfully receives the synchronization information in the downlink but fails to receive the BCCH after a predetermined time, the terminal stores the log information.
- the log information includes current cell information, current location information, measurement information of neighboring cells, and the like.
- additional log information for considering characteristics of each physical channel is needed.
- the first embodiment describes log information of a new configuration
- the second embodiment proposes a new storage time and log information of the log information.
- the third embodiment proposes a method of using log information of a mobile terminal without limitation through log information forwarding between base stations.
- FIG 3 illustrates an overall process according to the first embodiment of the present invention.
- the base station eNB 305 determines, in step 315, reference information for determining whether the BCCH has been successfully received according to an embodiment of the present invention, that is, timers X, Y, It delivers Z and count threshold (THRES) information.
- the reference information is to provide an information storage time point for classifying and storing the reason for the failure of BCCH reception in the terminal 310. That is, the reference information may be time information for classifying a BCCH reception failure reason into any one of a PBCH reception failure, a PDSCH reception failure, or a PDCCH reception failure.
- the terminal 310 informs the base station 305 whether the reference information is well received through ACK or NACK.
- the reference information may be previously assigned to the terminal 310 as a fixed value, and the terminal 310 may store the reference information.
- the base station 305 generates the BCCH in step 325 and delivers the BCCH to the terminal 310 in step 330.
- the MIB is transmitted on the physical channel PBCH
- the SIB is transmitted on a PDSCH resource indicated by the PDCCH.
- the base station 305 transmits the BCCH according to a preset transmission parameter.
- the transmission parameter includes at least one of a data rate such as a transmission power or a coding rate of the BCCH.
- the terminal 310 detects this in step 335 and attempts to receive a PBCH in step 340. If the PBCH is successfully received, the terminal 310 stores the number of times of successfully receiving the PDCCH while attempting to receive the SIB in step 345 as log information. If the BCCH reception does not succeed even after a certain time, the UE detects this in step 350, and in step 355, not only the existing log information, but also the reason for the failure of BCCH reception, the number of successful reception of the PDCCH, and the time when the log information is recorded. Save it. At this time, a detailed description of the reason for the failure of BCCH reception and the number of successful reception of the PDCCH will be described below. And if it does not receive the BCCH, the terminal 310 may not be connected to the base station 305.
- the base station 305 requests the terminal 310 to report log information in step 365.
- the terminal 310 transmits previously stored log information to the base station 305.
- the terminal 310 detects this in step 375 and transmits previously stored log information to the base station in step 380.
- the base station 305 adjusts and resets transmission parameters of PBCH, PDCCH, and PDSCH based on the log information received in step 385, thereby optimizing the reception performance of the next BCCH transmission. That is, when there is a problem in PBCH reception, the base station 305 may increase the transmission power of the PBCH.
- the base station 305 may lower the coding rate or increase the transmission power. Or, if there is a problem in PDSCH reception, the base station 305 may adjust a modulation and coding scheme (MCS) or increase transmission power.
- MCS modulation and coding scheme
- the error requirement of the PDCCH is lower.
- the PDCCH is managed by including the number of successful reception of the PDCCH in the log information list.
- the number of times of successfully receiving the PDCCH is measured for a predetermined time through the reception timer or during a corresponding time interval by designating a specific measurement point.
- the number of successful reception may be a measure of the reception performance of the PDCCH.
- the transmission of system information of BCCH involves three physical channels such as PBCH, PDCCH and PDSCH. Accordingly, the terminal 310 may successfully receive these physical channels to obtain system information. Error requirements in each physical channel are different and are managed separately at the base station 305. For example, in PBCH, coding rate 1/48 is applied, which is excellent in FEC (Forward Error Correction) capability, and transmits PBCH with the same information in four times within 40 ms, and can be combined between them. Do. In the PDCCH, power boost and variable coding rate may be adjusted, but a retransmission scheme such as HARQ is not applied. In SIB transmission in PDSCH, HARQ and Adaptive Modulation and Coding Scheme (AMC) are applied.
- AMC Adaptive Modulation and Coding Scheme
- the reception success probability of each channel is different.
- the base station 305 may perform a task for improving reception performance for each channel.
- the log information may include current cell information, current location information, and measurement information of neighbor cells. In addition to this, in addition to the log information list, BCCH reception failure reason is sent as below.
- 'MIB failure' refers to a case in which an error occurs in PBCH reception and thus no MIB information is obtained.
- 'PDCCH failure' indicates a case where an error occurs in PDCCH reception so that an address of a PDSCH resource including SIB information is unknown.
- 'SIB #N failure' indicates a case in which an error occurs in PDSCH reception, thereby failing to obtain N-th SIB information.
- FIG. 4 is an operation flowchart of a terminal according to the first embodiment of the present invention.
- the operation of the terminal 310 is largely divided into a process of receiving a MIB and a process of receiving a SIB.
- the terminal 310 After successfully receiving the synchronization information from the base station 305 in step 405, the terminal 310 operates timers X, Y, and Z in step 410.
- the terminal 310 may receive reference information including the timers X, Y, and Z together with the synchronization information, and may preset and store the timers X, Y, and Z.
- the timers X, Y, and Z values may be set identically or differently according to circumstances.
- the terminal 310 initializes the PDCCH reception success count count value COUNT to be stored as log information to zero. After the PBCH is successfully received, the terminal 310 detects this in step 420 and proceeds to receiving a PDCCH based on MIB information in step 435.
- the terminal 310 If the PBCH is not received, the terminal 310 retries steps 420 and 425 until the timer X expires in step 425. When the timer X expires and finally fails to receive the PBCH, the terminal 310 stores existing log information, 'MIB failure', and a time at which log information is recorded in step 430.
- the terminal 310 detects this in step 440, and attempts to receive a PDCCH with scheduling information of the N-th SIB in step 445. If the PDCCH reception is successful, the terminal 310 increases the PDCCH reception success count by 1 in step 455. In step 460, the terminal 310 decodes scheduling information on the frequency of the N-th SIB transmitted from the PDCCH to the PDSCH. In step 465, the terminal 310 attempts to receive the N-th SIB from the PDSCH using the corresponding scheduling information. At this time, if the SIB #N is not obtained from the PDSCH, the terminal 310 performs steps 445 to 465 again. If the terminal 310 successfully receives the N-th SIB, the process ends.
- the terminal 310 determines the reason for the BCCH reception failure based on the PDCCH reception success count count value stored in step 480.
- the terminal 310 determines the reason for the BCCH reception failure based on the PDCCH reception success count count value stored in step 480. That is, the terminal 310 compares the PDCCH reception success count count value with a predetermined count threshold value.
- the terminal 310 determines that there is a problem in the reception of the PDCCH in step 485, the 'PDCCH failure', the PDCCH reception success count count value, and corresponding log information. Stores the saved time as log information.
- the terminal 310 determines that there is a problem with PDSCH reception in step 490, and generates 'SIB #N failure' information and PDCCH for the Nth SIB that failed to receive. Stores the number of successful reception counts and the time when the log information is stored.
- FIG. 5 is a functional block diagram of a terminal according to the first embodiment of the present invention.
- the terminal includes a transceiver 505, a channel analyzer 510, a log information storage 515, and a PUSCH generator 520.
- the transceiver 505 receives physical channels such as PBCH, PDCCH, PDSCH, and the like.
- the channel analyzer 510 decodes necessary information from each physical channel.
- the channel analyzer 510 acquires MIB information from the PBCH, obtains scheduling information of the SIB from the PDCCH, and obtains SIB information from the PDSCH.
- the channel analyzer 510 determines which physical channel failed during the reception process and stores the physical channel in the log information storage unit 515.
- the PUSCH generator 520 causes the BCCH reception failure and the number of successful PDCCH receptions.
- the log information such as the count value is included in the PUSCH and transmitted to the base station 305 through the transceiver 505.
- FIG. 6 is an operation flowchart of a base station according to the first embodiment of the present invention.
- the base station 305 collects log information from the terminals 310 in the cell service area.
- the base station 305 deletes the log information that is too old using the recording time of the log information, and then classifies the log information according to the BCCH reception failure reason.
- the base station 305 increases the transmit power of the PBCH in step 620.
- the base station 605 reduces the transmission power of the PBCH in step 630.
- the base station 305 increases the transmission power of the PDCCH or decreases the coding rate in step 640.
- the base station 305 reduces the transmission power of the PDCCH or increases the coding rate in step 650.
- the base station 305 increases the transmit power of SIB # 1 or changes to MCS for a smaller data rate in step 660.
- the base station 305 reduces the transmit power of the SIB #N in step 670 or changes to the MCS for a larger data rate. Thereafter, the base station 305 may apply reconfiguration of the PDSCH for SIB #N separately in steps 675 to 680, and may apply the same reconfiguration to all SIBs.
- FIG. 7 is a functional block diagram of a base station according to the first embodiment of the present invention.
- the base station includes a transceiver 705, a PBCH, a PDCCH, a PDSCH generator 710, and a log information analyzer 715.
- the transceiver 705 receives log information from the terminal 310.
- the log information analyzer 715 analyzes log information.
- the log information analyzer 715 may identify 'MIB failure', 'PDCCH failure', and 'SIBx failure', which are causes of BCCH reception failure stored in the log information.
- the PBCH, PDCCH, and PDSCH generators 710 adjust the physical channel related parameters, that is, the transmission parameters, according to the BCCH reception failure reasons. Since the transmission parameters that can be adjusted for each physical channel are as described above, a detailed description thereof will be omitted.
- PBCHs having the same information are transmitted four times within 40 ms, and these may be combined with each other. For example, even if it fails to receive the first PBCH within a period of 40 ms, MIB information can be obtained by decoding the next transmitted PBCH alone or combining with the first PBCH.
- the PDSCH may retransmit the SIB using an HARQ technique that does not use the feedback information.
- the same SIB can be transmitted multiple times within the range of SI-Window. Even if the first packet is not decoded correctly, subsequent transmissions can be combined with previous packets to improve reception.
- Coupling techniques that improve reception performance can be a measure of channel reception performance in current wireless environments. The greater the number of combinations until successful reception, the lower the channel reception performance. Therefore, if the number of combinations is reported as log information, channel performance can be improved by increasing transmission power and adjusting AMC based on this. In the second embodiment, a new information storage time is defined.
- FIG. 8 illustrates an overall process according to a second embodiment of the present invention.
- the base station 805 informs the terminal 810 in advance of reference information for determining whether the BCCH has been successfully received according to an embodiment of the present invention, that is, reference threshold values X 1 and X 2 information. And so on.
- the reference information is for providing an information storage time point for storing the number of packet combining for receiving the BCCH in the terminal 810. That is, the reference information may be condition information for storing the number of packet combining as log information.
- the terminal 810 informs the base station 805 whether the reference information is well received through ACK or NACK.
- the reference information may be allocated to the terminal 810 with a fixed value in advance, and the terminal 310 may store the reference information.
- the base station 805 generates a BCCH in step 825 and transmits the BCCH to the terminal 810 in step 830.
- the MIB is transmitted on the physical channel PBCH
- the SIB is transmitted on a PDSCH resource indicated by the PDCCH.
- the base station 805 transmits the BCCH according to a preset transmission parameter.
- the transmission parameter includes at least one of a data rate such as a transmission power or a coding rate of the BCCH.
- the terminal 810 detects this in step 835, receives a PDSCH transmitting a PBCH or SIB #N in step 840, and successfully receives a PBCH or PDSCH.
- the number of packet combining up to is stored as log information.
- the terminal 810 since the combining scheme is applied to the PBCH and the PDSCH, the terminal 810 may store the number of packet combining associated with the corresponding channel as log information. Alternatively, the terminal 810 may store the number of packet combining of both the PBCH and the PDSCH.
- the terminal 810 detects this in step 845 and uses the log information as the log information in step 850. Save it.
- the terminal 810 transmits the log information to the base station 805 in step 860.
- the terminal 810 transmits the log information to the base station 805 in step 870.
- the base station 805 adjusts and resets transmission power to optimize reception performance of the PBCH or PDSCH based on the log information in step 875. For example, when the number of packet combining of the PBCH is larger than X 1 , the base station 805 determines that the reception performance is poor and increases the transmission power. In contrast, when the number of packet combining times is smaller than X 2 , the base station 805 determines that the reception performance is good and reduces the transmission power. In the case of PDSCH, not only the transmission power but also the MCS can be adjusted.
- FIG. 9 is an operation flowchart of a terminal according to a second embodiment of the present invention.
- the terminal 810 attempts to receive a PBCH in step 905.
- the terminal 810 determines whether the number of packet combining exceeds X 1 until the PBCH is successfully received. In addition, the terminal 810 determines whether the number of packet combining is less than X 2 until the PBCH is successfully received in step 915. In this case, if it is determined that the number of packet combining exceeds X 1 or less than X 2 , the terminal 810 stores the number of packet combining as log information in step 920. The same applies to the PDSCH. In addition, when a request from the base station 805 or a specific condition is satisfied, the terminal 810 transmits corresponding log information to the base station 805.
- FIG. 10 is a functional block diagram of a terminal according to the second embodiment of the present invention.
- the terminal includes a transceiver 1005, a channel analyzer 1010, a log information storage unit 1015, and a PUSCH generator 1020.
- the transceiver 1005 receives physical channels such as PBCH and PDSCH.
- the channel analyzer 1010 counts the number of packet combining until each physical channel is successfully received. If the number of packet combining times exceeds X 1 or less than X 2 , the channel analyzer 1010 stores the number of packet combining times in the log information storage unit 1015. If there is a request from the base station 805 or a specific condition is satisfied, the PUSCH generator 1020 includes the log information in the PUSCH and transmits the log information to the base station 805 through the transceiver 1005.
- FIG. 11 is an operation flowchart of a base station according to the second embodiment of the present invention.
- a base station receives log information including a packet combining number of PBCHs or a packet combining number of PDSCHs having SIB #N information from a terminal.
- FIG. 11A illustrates a case where the base station receives the number of combining information of the PBCH.
- FIG. 11B illustrates a case where the base station receives the number of times of combining the PDSCHs.
- the base station 805 receives packet combining count information of the PBCH in step 1105.
- the base station 805 increases the transmit power of the PBCH in step 1115.
- the base station 805 reduces the transmission power of the PBCH in step 1125.
- the base station 805 receives the packet combining number information of the PDSCH in step 1135.
- the base station 805 increases the transmission power of the PDSCH or changes the MCS for a smaller data rate in step 1145.
- the base station 805 reduces the transmission power of the PDSCH or changes the MCS for a larger data rate in step 1155.
- the values of X 1 and X 2 for the PBCH or PDSCH may vary.
- FIG. 12 is a functional block diagram of a base station according to the second embodiment of the present invention.
- the base station includes a transceiver 1205, a PBCH / PDSCH generator 12010, and a log information analyzer 1215.
- the transceiver 1205 receives log information from the terminal 810.
- the log information analyzer 1215 analyzes log information.
- the log information analyzer 1215 determines whether the channel state is good or poor based on the packet combining number information.
- the PBCH / PDSCH generator 1210 adjusts each physical channel related parameter, that is, a transmission parameter according to the channel state. That is, the PBCH / PDSCH generator 1210 may increase or decrease the transmit power for the PBCH to reflect the channel state, and may adjust not only the transmit power but also the MCS for the PDSCH.
- the terminal After the terminal fails to receive the BCCH from one base station, it can move to another base station. At this time, the terminal stores the log information related to the base station for the first time. After moving to another base station, if a smooth communication is possible, the terminal first reports log information related to the base station to the currently communicating base station. Since the cell information is basically stored in the log information, the base station currently communicating can know whether the received log information is its own. Log information related to another base station may be discarded, but if the information can be delivered to the neighboring base station, the neighboring base station may use this information. In the third embodiment, a process of transferring log information between base stations according to such a scenario will be described.
- FIG. 13 is a diagram for explaining a scenario requiring log information exchange between base stations.
- first base stations eNB 1 and 1305 transmit BCCH.
- the terminal 1310 in the service area of the first base station fails to receive the BCCH and stores log information. After that, the terminal 1310 moves to enter the service area of the second base station eNB 2 and 1315. After the terminal 1310 can communicate with the second base station 1315, the terminal 1310 transmits the stored log information to the second base station 1315.
- the log information is related to the first base station 1305 which is a neighbor base station of the second base station 1315.
- 14 is a diagram illustrating a procedure of exchanging log information between base stations.
- the first base station 1410 transmits a BCCH to the terminal 1405 in step 1425.
- the terminal 1405 stores the log information in step 1435.
- the terminal 1405 transmits log information to the second base station 1415 in step 1445. Report to.
- the second base station 1415 determines that the log information is related to the first base station 1410 based on the cell information in step 1450. If there is an X2 interface between the first base station 1410 and the second base station 1415, the second base station 1415 transmits the corresponding log information to the first base station 1410 through the X2 interface in step 1455. do. Alternatively, if there is no X2 interface between the first base station 1410 and the second base station 1415, the second base station 1415 transmits the log information to the relay server 1420 in step 1460. In this case, the relay server 1420 may generally communicate with all base stations 1410 and 1415.
- the relay server 1420 may be a SON server, or may be implemented in a configuration in a mobile communication system such as a mobility management entity (MME). Thereafter, the relay server 1420 transfers the log information to the first base station 1410 by using the cell information in the log information transmitted in step 1465.
- MME mobility management entity
- 15 is an operation flowchart of a base station according to the third embodiment of the present invention.
- the base stations 1410 and 1415 detect this in step 1505 and check cell information of the log information in step 1510. If the log information is determined to be related to the corresponding base station 1410 or 1415 through the cell information, the base station 1410 or 1415 performs the procedure described in the first or second embodiment in step 1515 and transmits the information. Optimize the parameters. Alternatively, if it is determined that the log information is not related to the corresponding base station 1410 and 1415 through the cell information, the base station 1410 and 1415 connects to the X2 interface with other base stations 1410 and 1415 corresponding to the cell information in step 1520. Check if it is In addition, if the corresponding X2 interface exists, the base station 1410, 1415 transfers the log information directly through the X2 interface in step 1525, and otherwise, transmits the log information to the relay server 1420 in step 1530.
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Abstract
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Claims (15)
- 기지국의 방송 제어 채널 전송 방법에 있어서,미리 설정되는 송신 패러미터에 따라 방송 제어 채널을 전송하는 과정과,상기 방송 제어 채널의 수신 성공 여부를 나타내는 로그 정보를 수집하는 과정과,상기 로그 정보를 분석하여 상기 송신 패러미터를 재설정하는 과정을 포함하는 것을 특징으로 하는 방송 제어 채널 전송 방법.
- 제 1 항에 있어서,상기 로그 정보는 상기 방송 제어 채널의 수신 실패 사유, 상기 방송 제어 채널의 수신을 위한 하향링크 제어 채널의 성공적 수신 횟수, 상기 로그 정보의 기록 시간 또는 상기 방송 제어 채널의 수신을 위한 패킷 결합 횟수 중 적어도 어느 하나를 포함하는 것을 특징으로 하는 방송 제어 채널 전송 방법.
- 제 1 항에 있어서,상기 송신 패러미터는 상기 방송 제어 채널의 송신 전력 또는 데이터 비율 중 적어도 어느 하나를 포함하는 것을 특징으로 하는 방송 제어 채널 전송 방법.
- 제 2 항에 있어서,상기 방송 제어 채널의 수신 성공 여부를 결정하기 위한 기준 정보로 상기 수신 실패 사유를 분류하기 위한 시간 정보 또는 상기 패킷 결합 횟수의 기록 여부를 판단하기 위한 조건 정보 중 적어도 어느 하나를 전송하는 과정을 더 포함하는 것을 특징으로 하는 방송 제어 채널 전송 방법.
- 기지국의 방송 제어 채널 전송 장치에 있어서,미리 설정되는 송신 패러미터들에 따라 방송 제어 채널을 생성하기 위한 방송 제어 채널 생성부와,상기 방송 제어 채널을 송신하고, 상기 방송 제어 채널의 수신 성공 여부를 나타내는 로그 정보를 수신하기 위한 송수신부와,상기 로그 정보를 수집하고, 상기 로그 정보를 분석하여 상기 송신 패러미터들을 재설정하기 위한 로그 정보 분석부를 포함하는 것을 특징으로 하는 방송 제어 채널 전송 장치.
- 제 5 항에 있어서,상기 로그 정보는 상기 방송 제어 채널의 수신 실패 사유, 상기 방송 제어 채널의 수신을 위한 하향링크 제어 채널의 성공적 수신 횟수, 상기 로그 정보의 기록 시간 또는 상기 방송 제어 채널의 수신을 위한 패킷 결합 횟수 중 적어도 어느 하나를 포함하는 것을 특징으로 하는 방송 제어 채널 전송 장치.
- 제 5 항에 있어서,상기 송신 패러미터는 상기 방송 제어 채널의 송신 전력 또는 데이터 비율 중 적어도 어느 하나를 포함하는 것을 특징으로 하는 방송 제어 채널 전송 장치.
- 제 6 항에 있어서,상기 방송 제어 채널의 수신 성공 여부를 결정하기 위한 기준 정보로 상기 수신 실패 사유를 분류하기 위한 시간 정보 또는 상기 패킷 결합 횟수의 기록 여부를 판단하기 위한 조건 정보 중 적어도 어느 하나를 전송하는 과정을 더 포함하는 것을 특징으로 하는 방송 제어 채널 전송 장치.
- 단말기의 방송 제어 채널 수신 방법에 있어서,기지국에서 미리 설정된 송신 패러미터에 따라 전송되는 방송 제어 채널 수신 시, 상기 방송 제어 채널의 수신 성공 여부를 나타내는 로그 정보를 기록하는 과정과,상기 로그 정보을 분석하여 상기 송신 패러미터를 재설정하도록 상기 기지국에 상기 로그 정보를 피드백하는 과정을 포함하는 것을 특징으로 하는 방송 제어 채널 수신 방법.
- 제 9 항에 있어서,상기 로그 정보는 상기 방송 제어 채널의 수신 실패 사유, 상기 방송 제어 채널의 수신을 위한 하향링크 제어 채널의 성공적 수신 횟수, 상기 로그 정보의 기록 시간 또는 상기 방송 제어 채널의 수신을 위한 패킷 결합 횟수 중 적어도 어느 하나를 포함하는 것을 특징으로 하는 방송 제어 채널 수신 방법.
- 제 9 항에 있어서,상기 송신 패러미터는 상기 방송 제어 채널의 송신 전력 또는 데이터 비율 중 적어도 어느 하나를 포함하는 것을 특징으로 하는 방송 제어 채널 수신 방법.
- 단말기의 방송 제어 채널 수신 장치에 있어서,기지국에서 미리 설정된 송신 패러미터에 따라 전송되는 방송 제어 채널 수신 시, 상기 방송 제어 채널의 수신 성공 여부를 판단하기 위한 채널 분석부와,상기 방송 제어 채널의 수신 성공 여부에 따라 로그 정보를 기록하기 위한 로그 정보 저장부와,상기 채널 분석부의 제어 하에, 상기 방송 제어 채널을 수신하고, 상기 로그 정보을 분석하여 상기 송신 패러미터를 재설정하도록 상기 기지국에 상기 로그 정보를 피드백하기 위한 송수신부를 포함하는 것을 특징으로 하는 방송 제어 채널 수신 방법.
- 제 12 항에 있어서,상기 로그 정보는 상기 방송 제어 채널의 수신 실패 사유, 상기 방송 제어 채널의 수신을 위한 하향링크 제어 채널의 성공적 수신 횟수, 상기 로그 정보의 기록 시간 또는 상기 방송 제어 채널의 수신을 위한 패킷 결합 횟수 중 적어도 어느 하나를 포함하는 것을 특징으로 하는 방송 제어 채널 수신 방법.
- 제 12 항에 있어서,상기 송신 패러미터는 상기 방송 제어 채널의 송신 전력 또는 데이터 비율 중 적어도 어느 하나를 포함하는 것을 특징으로 하는 방송 제어 채널 수신 방법.
- 제 13 항에 있어서, 상기 채널 분석부는,상기 방송 제어 채널의 수신 성공 여부를 결정하기 위한 기준 정보로 상기 수신 실패 사유를 분류하기 위한 시간 정보 또는 상기 패킷 결합 횟수의 기록 여부를 판단하기 위한 조건 정보 중 적어도 어느 하나를 저장하고 있는 것을 특징으로 하는 방송 제어 채널 수신 방법.
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KR1020127009440A KR101715755B1 (ko) | 2009-08-24 | 2010-08-24 | 이동통신 시스템에서 방송 제어 채널 송수신 방법 및 장치 |
EP10812219.3A EP2472742B1 (en) | 2009-08-24 | 2010-08-24 | Method and device for sending and receiving a broadcast control channel in a mobile communication system |
CN201080042714.9A CN102577172B (zh) | 2009-08-24 | 2010-08-24 | 在移动通信系统中发送和接收广播控制信道的方法和装置 |
US13/391,975 US9185588B2 (en) | 2009-08-24 | 2010-08-24 | Method and device for sending and receiving a broadcast control channel in a mobile communication system |
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- 2010-08-24 CN CN201080042714.9A patent/CN102577172B/zh not_active Expired - Fee Related
- 2010-08-24 WO PCT/KR2010/005613 patent/WO2011025205A2/ko active Application Filing
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WO2014127385A1 (en) * | 2013-02-18 | 2014-08-21 | Airometric Wireless Inc. | Performance evaluation of services and applications on devices in live wireless environments |
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EP2472742B1 (en) | 2020-05-27 |
EP2472742A4 (en) | 2016-07-27 |
US20120157090A1 (en) | 2012-06-21 |
WO2011025205A3 (ko) | 2011-07-14 |
KR20120093878A (ko) | 2012-08-23 |
KR101715755B1 (ko) | 2017-03-14 |
US9185588B2 (en) | 2015-11-10 |
CN102577172B (zh) | 2015-10-14 |
EP2472742A2 (en) | 2012-07-04 |
CN102577172A (zh) | 2012-07-11 |
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