WO2014069599A1 - 基地局装置 - Google Patents
基地局装置 Download PDFInfo
- Publication number
- WO2014069599A1 WO2014069599A1 PCT/JP2013/079628 JP2013079628W WO2014069599A1 WO 2014069599 A1 WO2014069599 A1 WO 2014069599A1 JP 2013079628 W JP2013079628 W JP 2013079628W WO 2014069599 A1 WO2014069599 A1 WO 2014069599A1
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- WIPO (PCT)
- Prior art keywords
- station apparatus
- base station
- mobile station
- reference signal
- srs
- Prior art date
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0096—Indication of changes in allocation
- H04L5/0098—Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/34—Reselection control
- H04W36/38—Reselection control by fixed network equipment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B
Definitions
- the present invention relates to a base station apparatus.
- LTE Long Term Evolution
- IMT-A Long Term Evolution Advanced
- the base station device moves in order to grasp the propagation path information used when radio resources are allocated to the mobile station device.
- the station transmits a sounding reference signal (SRS: Sounding Reference Signal) to the base station.
- SRS Sounding Reference Signal
- the mobile station apparatus is notified of parameters (also referred to as parameter sets) used for SRS transmission by RRC (Radio Resource Control) signaling, and transmits based on the parameter sets.
- RRC Radio Resource Control
- a mobile station apparatus in the LTE system supports Periodic-SRS (P-SRS) of SRS that is transmitted at regular intervals.
- P-SRS Periodic-SRS
- the LTE-A system in addition to supporting multi-antenna transmission in the uplink, one base station is required to accommodate more users than LTE. .
- P-SRS that transmits at regular intervals in LTE, it is only necessary to transmit periodically according to a specific transmission rule specified in the RRC layer, so it is necessary to support multi-antenna and accommodate a large number of users. There is no scheduling flexibility. For this reason, the LTE-A system introduces an aperiodic-SRS (A-SRS) that can trigger a terminal device only when uplink sounding is necessary and can transmit an SRS using only necessary radio resources when necessary. Has been.
- A-SRS aperiodic-SRS
- the trigger of A-SRS is determined based on transmission instruction information added to DCI (Downlink Control Information) which is a control signal of the physical layer.
- DCI Downlink Control Information
- the A-SRS transmission instruction information includes 1 bit in DCI formats 0, 1A, 2B, and 2C, and 2 bits in DCI format 4.
- a parameter set used for A-SRS transmission is also notified by RRC signaling, and different parameter sets can be prepared depending on whether transmission is instructed in DCI format 0 or transmission in DCI formats 1A, 2B, and 2C.
- This parameter set includes information on the amount of cyclic shift rotation, IFDM comb position, number of antenna ports, SRS transmission bandwidth, and frequency position (see Non-Patent Document 1).
- a small cell configured by a pico base station apparatus is configured in a macro cell configured by a macro base station apparatus (a base station apparatus having a wide coverage), and the number of mobile station apparatuses connected to the macro base station apparatus.
- a macro base station apparatus a base station apparatus having a wide coverage
- the number of mobile station apparatuses connected to the macro base station apparatus is considered to instruct a specific mobile station apparatus to connect to the pico base station apparatus and perform data transmission.
- the macro base station apparatus can offload data transmission to the pico base station apparatus, and throughput of the entire cell can be improved.
- the pico base station apparatus When the macro base station apparatus instructs the mobile station apparatus to connect to the small cell, the pico base station apparatus receives the P-SRS or A-SRS transmitted from the mobile station apparatus, and propagation path information used for scheduling It is necessary to know the reception quality for link adaptation.
- the pico base station apparatus transmits a parameter set of P-SRS and A-SRS by RRC signaling after instructing connection to the small cell. It is necessary to receive the P-SRS and A-SRS transmitted from the mobile station apparatus based on the notified parameter set. Therefore, there is a problem in that the overhead from when the macro base station apparatus transmits an instruction to connect to the small cell to the mobile station apparatus until the pico base station apparatus schedules the mobile station apparatus increases.
- the present invention has been made in view of the above points, and provides a base station apparatus that reduces the overhead required for a pico base station apparatus to allocate radio resources to a mobile station apparatus from a connection instruction to a small cell.
- the present invention has been made to solve the above problems, and one aspect of the present invention is a first base station apparatus constituting a first cell that transmits control information to a mobile station apparatus.
- a second cell configured by a second base station apparatus exists in the first cell, and the first base station apparatus transmits a reference signal to a mobile station apparatus in the first cell.
- the control information instructing to transmit the reference signal to either the first base station apparatus or the second base station apparatus and the base station apparatus instructed in the control information Includes information on transmission parameters used for transmitting the reference signal, and notifies the mobile station apparatus of the control information.
- the cell ID is notified as information specifying that a reference signal is transmitted to either the first base station apparatus or the second base station apparatus.
- the carrier frequency is notified as information specifying that a reference signal is transmitted to either the first base station apparatus or the second base station apparatus.
- the first base station apparatus transmits a parameter of a reference signal to be transmitted to the first base station apparatus and a second base station apparatus to the mobile station apparatus. Both parameters of the reference signal are notified in advance.
- the first base station apparatus specifies a base station apparatus that transmits a reference signal according to a type of control information that instructs transmission of the reference signal.
- the throughput of the entire cell can be improved.
- a transmitting apparatus that transmits data and reference signals is a mobile station apparatus (user apparatus; UE), and a receiving apparatus that receives data and reference signals is a base station apparatus (eNB; e-NodeB). To do.
- FIG. 1 is a schematic diagram of an uplink of a cellular system according to the first embodiment of the present invention.
- a macro base station apparatus eNB1 having a wide coverage (a cell radius is large) exists, and a small cell (a hatched area in the figure) having a small cell radius is configured in the cell of the macro base station apparatus eNB1.
- a pico base station device eNB2 to be connected, and there are mobile station devices UE1, UE2, UE3 connected to any of the base station devices.
- the macro base station apparatus eNB1 and the pico base station apparatus eNB2 have different cell IDs.
- the cell ID may be a physical cell ID (PCID: Physical Cell ID) or a virtual cell ID (VCID: Virtual Cell ID).
- PCID Physical Cell ID
- VCID Virtual Cell ID
- the mobile station apparatuses UE1, UE2, and UE3 are connected to the macro base station apparatus eNB1, but the macro base station apparatus eNB1 connects the mobile station apparatuses UE1 and UE2 to the pico base station apparatus for offloading purposes.
- a connection instruction can be issued to the eNB 2.
- the macro base station apparatus eNB1 determines the mobile station apparatus to be offloaded before the connection instruction to the pico base station apparatus eNB2, with respect to the offload candidate mobile station apparatus, eNB2 for pico base station apparatus
- An A-SRS transmission instruction can be issued by using the parameter set.
- the macro base station apparatus eNB1 can appropriately determine the mobile station apparatus that issues a connection instruction to the pico base station apparatus eNB2 based on the propagation path characteristics. Furthermore, the overhead from the connection instruction to the pico base station apparatus eNB2 to the radio resource allocation by the pico base station apparatus eNB2 can be reduced.
- a small cell configured by the pico base station apparatus eNB2 is included in a cell (macro cell) configured by the macro base station apparatus eNB1 is described, but a part of the small cell is included in the macro cell.
- the present invention may be applied to a case where a small cell is not included in a macro cell.
- Fig. 2 shows a sequence diagram of this embodiment.
- the macro base station apparatus eNB1 notifies the mobile station apparatus of five types of parameter sets by RRC signaling to the mobile station apparatus connected to the macro base station apparatus eNB1.
- the macro base station apparatus eNB1 notifies the mobile station apparatus of an A-SRS transmission instruction using the parameter set for the macro base station apparatus.
- the mobile station apparatus transmits A-SRS based on the parameter set.
- the macro base station apparatus eNB1 receives the A-SRS transmitted in steps S101 to S103 to a plurality of mobile station apparatuses, and performs radio resource allocation for data transmission by grasping the propagation path characteristics.
- the macro base station apparatus eNB1 selects candidate mobile station apparatuses to be connected to the pico base station apparatus eNB2 when some mobile station apparatuses are connected to the pico base station apparatus eNB2 for the purpose of offloading.
- the macro base station apparatus eNB1 notifies the selected mobile station apparatus of an A-SRS transmission instruction with a parameter set for the pico base station apparatus.
- the macro base station apparatus eNB1 notifies the pico base station apparatus eNB2 of information on the mobile station apparatus that transmits the A-SRS to the pico base station apparatus eNB2 and information on the parameter set instructed to transmit.
- the mobile station apparatus transmits A-SRS based on the parameter set.
- the macro base station apparatus eNB1 notifies the mobile station apparatus of a connection instruction to the pico base station apparatus eNB2.
- connection means data transmission.
- the propagation path characteristic estimated by the pico base station apparatus eNB2 by the A-SRS transmitted in S106 is not notified to the macro base station apparatus eNB1, but may be notified. Furthermore, the macro base station apparatus eNB1 is notified of the propagation path characteristics of the plurality of mobile station apparatuses from the pico base station apparatus eNB2, and issues a connection instruction to the pico base station apparatus eNB2 from the plurality of mobile station apparatuses. A device may be selected.
- connection instruction to the pico base station apparatus eNB2 in S107 is notified only to the mobile station apparatus, but may be notified to the pico base station apparatus eNB2, or the connection instruction to the pico base station apparatus eNB2 May be notified indirectly to the pico base station apparatus eNB2 by transmitting SR (Scheduling Request) to the pico base station apparatus eNB2.
- SR Service Request
- FIG. 3 is a schematic block diagram illustrating an example of the configuration of the macro base station apparatus eNB1 according to the present embodiment.
- the macro base station apparatus eNB1 has one transmission antenna and one reception antenna, but may have a plurality of antennas.
- the macro base station apparatus eNB1 may be configured to perform transmission and reception with one antenna.
- the macro base station apparatus eNB1 stores UE information connected by the UE information management unit 101, and when instructing connection to the pico base station apparatus eNB2 to some mobile station apparatuses, UE information Output to the parameter determination unit 103.
- the cell identifier management unit 102 outputs the PCID or VCID of the pico base station apparatus eNB2 that is a connection destination candidate to the parameter determination unit 103.
- Parameter determining section 103 receives the propagation path information of a plurality of mobile station apparatuses from propagation path estimating section 113, and sets the parameter set for the pico base station apparatus as a part of the A-SRS parameter set based on the propagation path information and UE information.
- the mobile station apparatus which contains is selected.
- the parameter determination unit 103 sets, as an A-SRS parameter set for each mobile station apparatus, in addition to information on the amount of cyclic shift rotation, IFDM comb position, number of antenna ports, SRS transmission bandwidth, and frequency position, ID information is determined.
- Table 1 shows an example of cell IDs included in five types of parameter sets.
- CIDm is the cell ID of the macro base station apparatus eNB1
- CIDp is the cell ID of the pico base station apparatus eNB2.
- the macro base station apparatus eNB1 issues an A-SRS transmission instruction in the pattern 1 or 2 of the DCI format 4
- the mobile station apparatus that has received the instruction performs an A-SRS based on the cell ID of the pico base station apparatus eNB2.
- Generate a signal when the macro base station apparatus eNB1 issues an A-SRS transmission instruction in the pattern 3 of the DCI format 4 or other DCI formats, the mobile station apparatus that has received the instruction performs an A ⁇ based on the cell ID of the macro base station apparatus eNB1.
- An SRS signal is generated.
- the cell ID of the macro base station apparatus eNB1 may be used in the patterns 1 to 3 of the DCI format 4, and the cell ID of the pico base station apparatus eNB2 may be used in other DCI formats.
- whether the transmission destination of the A-SRS is a macro base station apparatus or a pico base station apparatus is determined depending on the type of DCI format.
- the parameter determination unit 103 receives the determined cell ID, the amount of phase rotation between the subcarriers of cyclic shift, the IFDM comb position, the number of antenna ports, the SRS transmission bandwidth, and the frequency position information with the control information generation unit 105.
- the data is output to the transmission processing unit 107.
- connection instruction UE selection unit 104 determines a candidate mobile station apparatus that issues a connection instruction to the pico base station apparatus eNB2, and outputs the determined mobile station apparatus to the control information generation unit 105.
- the control information generation unit 105 receives and stores five parameter sets of A-SRS that are previously notified to the mobile station apparatus by RRC signaling from the parameter determination unit 103.
- the control information generation unit 105 receives information of candidate mobile station devices that instruct connection to the pico base station device eNB2 from the connection instruction UE selection unit 104, and issues an A-SRS transmission instruction of the corresponding mobile station device. In this case, a DCI format designating a parameter set for the pico base station apparatus is transmitted.
- the macro base station apparatus eNB1 When the macro base station apparatus eNB1 issues an A-SRS transmission instruction to other mobile station apparatuses, the macro base station apparatus eNB1 transmits a DCI format that specifies a parameter set for the macro base station apparatus.
- the macro base station apparatus eNB1 notifies the instruction in the DCI format 4 pattern 1 or 2 to the UE instructing to transmit A-SRS with the parameter set for the pico base station apparatus, and the macro The macro base station apparatus eNB1 notifies the instruction in the pattern 3 of the DCI format 4 to the UE instructing to transmit the A-SRS with the parameter set for the base station apparatus.
- the macro base station apparatus eNB1 may notify using a parameter set of a different DCI format.
- the control information generation unit 105 generates control information data to be transmitted by PDCCH (Physical Downlink Control Channel) using other control information in addition to the A-SRS transmission instruction.
- PDCCH Physical Downlink Control Channel
- information included as other control information includes frequency resource allocation, MCS (Modulation and Coding Schemes), TPC (Transmit Power Control), and the like.
- Control information generating section 105 outputs the generated control information signal to transmission processing section 107 and inter-base station communication section 106.
- the inter-base station communication unit 106 notifies the pico base station apparatus eNB2 of the information and parameter set of the mobile station apparatus that has instructed A-SRS transmission in the parameter set for the pico base station apparatus.
- the transmission processing unit 107 multiplexes with other information notified by RRC signaling, downlink data, PDCCH of control information, etc., and generates a plurality of OFDM (Orthogonal Frequency Division Multiplexing) signals to form a subframe,
- the data is output to the transmission unit 108.
- the transmission unit 108 inserts a CP (Cyclic Prefix) into the input subframe signal.
- the transmitter 108 converts the signal with the CP inserted into an analog signal by D / A (Digital / Analog) conversion, and up-converts the converted signal to a radio frequency.
- the transmission unit 108 amplifies the up-converted signal by a PA (Power Amplifier) and transmits the amplified signal through the transmission antenna 109.
- PA Power Amplifier
- the macro base station apparatus eNB1 receives the signal in which the A-SRS or P-SRS reference signal and the data signal are multiplexed by the reception antenna 110 and inputs the received signal to the reception unit 111.
- the receiving unit 111 down-converts the received signal to a baseband frequency and generates a digital signal by performing A / D (Analog / Digital) conversion on the down-converted signal. Further, the reception unit 111 outputs a signal obtained by removing CP from the digital signal to the reception processing unit 112.
- the reception processing unit 112 separates the data signal sequence and the reference signal and outputs the reference signal to the propagation path estimation unit 113.
- the propagation path estimation unit 113 estimates a propagation path characteristic (frequency response) from the received reference signal and outputs it to the parameter determination unit 103.
- FIG. 4 is a schematic block diagram showing an example of the configuration of the mobile station apparatus according to this embodiment.
- the mobile station apparatus receives a signal transmitted from the macro base station apparatus eNB 1 or the pico base station apparatus eNB 2 by the reception antenna 200 and inputs the signal to the reception unit 201.
- the receiving unit 201 down-converts the received signal to a baseband frequency, and generates a digital signal by performing A / D conversion on the down-converted signal.
- the receiving unit 201 outputs a signal obtained by removing CP from the digital signal to the reception processing unit 202.
- the reception processing unit 202 outputs the A-SRS parameter set notified by RRC signaling from a plurality of subframe OFDM signals to the reference signal parameter acquisition unit 203, and outputs the DCI format to the control information format identification unit 205. Output.
- the DCI format is determined in advance according to the transmission mode, and the mobile station apparatus obtains control information by performing blind decoding with the data size of the format used for a plurality of search space candidates.
- the reference signal parameter acquisition unit 203 outputs the received A-SRS parameter set to the parameter storage unit 204.
- the control information format identification unit 205 receives the DCI format obtained by blind decoding and identifies the format based on the data length. However, some DCI formats have the same size, and the DCI format is discriminated by the format identification flag.
- the control information format identifying unit 205 outputs the received format and a bit indicating an A-SRS transmission instruction to the reference signal transmission instruction identifying unit 206.
- the reference signal transmission instruction identifying unit 206 when the input A-SRS transmission instruction bit is an A-SRS transmission request, sets the parameter set to be used from the received format information and the A-SRS transmission instruction bit. Then, the specified parameter set and the A-SRS transmission request are output to the parameter storage unit 204.
- the parameter storage unit 204 stores the notified parameter set.
- the parameter storage unit 204 stores the designated parameter set.
- Information is output to reference signal generation section 207 and transmission signal generation section 208.
- the reference signal generation unit 207 generates a reference signal sequence based on the cell ID included in the designated parameter, and outputs the reference signal sequence to the transmission signal generation unit 208.
- the transmission signal generation unit 208 receives the reference signal, and based on the information on the cyclic shift rotation amount, IFDM comb position, number of antenna ports, SRS transmission bandwidth, and frequency position specified by the parameter storage unit 204.
- a transmission reference signal is generated and output to the transmission processing unit 209.
- the transmission processing unit 209 receives the transmission reference signal and the transmission data signal, converts these signals into subframes, and outputs the transmission signal to the transmission unit 211.
- Transmitting section 211 inserts a CP into the input subframe signal, converts it to an analog signal by D / A conversion, and upconverts the converted signal to a radio frequency.
- the transmission unit 211 amplifies the up-converted signal with PA and transmits it through the transmission antennas 210-1 to 210-Nt.
- the number of antenna ports is determined based on the information of the parameter set to be used.
- FIG. 5 is a schematic block diagram illustrating an example of the configuration of the pico base station apparatus eNB2 according to the present embodiment.
- the number of receiving antennas of the pico base station apparatus eNB2 is one in the figure, a plurality of receiving antennas may be provided.
- the pico base station apparatus eNB2 information on the mobile station apparatus that instructed the macro base station apparatus eNB1 to transmit A-SRS in the parameter set for the pico base station apparatus and information on the parameter set used by the mobile station apparatus Input to the inter-station communication unit 303.
- the inter-base station communication unit 303 outputs the notified information to the reference signal receiving unit 305.
- the pico base station apparatus eNB2 receives a signal transmitted from the mobile station apparatus by the reception antenna 301 and outputs the signal to the reception unit 302.
- the reception unit 302 performs the same processing as the reception unit 111 and outputs the digital signal after CP removal to the reception processing unit 304.
- the reception processing unit 304 separates the data signal sequence and the reference signal and outputs the reference signal to the reference signal receiving unit 305.
- the reference signal receiving unit 305 extracts the A-SRS based on the parameter set information input from the inter-base station communication unit 303 and outputs the A-SRS to the propagation path estimation unit 306.
- the propagation path estimation unit 306 obtains propagation path characteristics from the input A-SRS.
- the parameter set information is notified to the pico base station apparatus eNB2.
- a parameter set for the pico base station apparatus may be notified in advance.
- the mobile station apparatus connected to the macro base station apparatus eNB1 can transmit an A-SRS to the pico base station apparatus eNB2, and the pico base station apparatus eNB2
- the propagation path characteristics can be grasped. Therefore, a connection instruction to the pico base station apparatus eNB2 can be given to a mobile station apparatus with good propagation path characteristics between the mobile station apparatus and the pico base station apparatus.
- the pico base station apparatus eNB2 can grasp the propagation path characteristics before instructing the connection to the pico base station apparatus eNB2, the pico base station apparatus eNB2 allocates a radio resource from the connection instruction to the pico base station apparatus eNB2. The overhead required for this can be reduced.
- This embodiment demonstrates the case where cell ID of macro base station apparatus eNB1 and pico base station apparatus eNB2 is the same, and the used carrier frequency differs.
- the macro base station apparatus eNB1 uses the 2 GHz band
- the pico base station apparatus eNB2 uses the 3.5 GHz band.
- FIG. 6 shows a schematic block diagram illustrating an example of the configuration of the macro base station apparatus eNB1 according to the present embodiment.
- the cell identifier management unit 102 is a carrier frequency management unit 402
- the parameter determination unit 103 is a parameter determination unit 403.
- Other configurations are the same, and the description of the same processing as in the previous embodiment is omitted.
- the carrier frequency management unit 402 holds information on the carrier frequency used by the pico base station apparatus eNB2 that is a connection destination candidate, and outputs this information to the parameter determination unit 403.
- the parameter determination unit 403 receives the propagation path information of a plurality of mobile station apparatuses from the propagation path estimation unit 113, and sets the parameter set for the pico base station apparatus as a part of the A-SRS parameter set based on the propagation path information and the UE information.
- the mobile station apparatus which contains is selected.
- the parameter determination unit 403 includes, as information about the amount of cyclic shift, IFDM comb position, number of antenna ports, SRS transmission bandwidth, and frequency position, as an A-SRS parameter set for each mobile station device. Determine frequency information.
- Table 2 shows an example of carrier frequency information included in five types of parameter sets.
- F1 is the carrier frequency of the macro base station apparatus eNB1
- F2 is the carrier frequency of the pico base station apparatus eNB2.
- the mobile station apparatus transmits an A-SRS signal at the carrier frequency of the pico base station apparatus eNB2.
- the mobile station apparatus uses the A-SRS at the carrier frequency of the macro base station apparatus eNB1. Send the signal.
- FIG. 7 is a schematic block diagram showing an example of the configuration of the mobile station apparatus according to this embodiment.
- FIG. 7 differs from FIG. 4 in a parameter storage unit 504 and a transmission unit 511. Other configurations are the same, and the description of the same processing as in the previous embodiment is omitted.
- the parameter storage unit 504 stores the notified parameter set.
- the parameter storage unit 504 stores the designated parameter set.
- Information on the included carrier frequency is output to the transmission unit 511, and information on other parameter sets is output to the transmission signal generation unit 208.
- Transmitting section 511 inserts a CP into the subframe signal, converts it into an analog signal by D / A conversion, and upconverts it based on the input carrier frequency information.
- the transmission unit 511 amplifies the up-converted signal with PA and transmits it through the transmission antennas 210-1 to 210-Nt.
- the number of antenna ports is determined based on the information of the parameter set to be used.
- the configuration of the pico base station apparatus eNB2 according to the present embodiment is the same as that of the previous embodiment, and a description thereof will be omitted because it becomes FIG.
- the mobile station device connected to the macro base station device eNB1 can transmit an A-SRS to the pico base station device eNB2, and the pico base station device eNB2
- the propagation path characteristics can be grasped. Therefore, the macro base station apparatus eNB1 can instruct a mobile station apparatus with good propagation path characteristics between the mobile station apparatus and the pico base station apparatus to connect to the pico base station apparatus eNB2. Further, since the propagation path characteristics can be grasped before the connection instruction to the pico base station apparatus eNB2, overhead required for radio resource allocation by the pico base station apparatus eNB2 is reduced from the connection instruction to the pico base station apparatus eNB2. Can.
- FIG. 8 shows a schematic block diagram illustrating an example of the configuration of the macro base station apparatus eNB1 according to the present embodiment.
- the carrier frequency management unit 402 is a picocell information management unit 602
- the parameter determination unit 403 is a parameter determination unit 603.
- Other configurations are the same, and the description of the same processing as in the previous embodiment is omitted.
- the pico cell information management unit 602 holds information on the carrier frequency and the PCID or VCID used by the pico base station apparatus eNB2 that is a connection destination candidate, and outputs this information to the parameter determination unit 603.
- Parameter determining section 603 receives propagation path information of a plurality of mobile station apparatuses from propagation path estimating section 113, and sets a parameter set for a pico base station apparatus as a part of the A-SRS parameter set based on the propagation path information and UE information.
- the mobile station apparatus which contains is selected.
- the parameter determination unit 603 sets, as the A-SRS parameter set for each mobile station apparatus, in addition to the information on the cyclic shift rotation amount, IFDM comb position, number of antenna ports, SRS transmission bandwidth, and frequency position, ID and carrier frequency information is determined.
- Table 3 shows an example of carrier frequency information included in five types of parameter sets.
- F1 is the carrier frequency of the macro base station apparatus eNB1
- F2 is the carrier frequency of the pico base station apparatus eNB2.
- CIDm is the cell ID of the macro base station apparatus eNB1
- CIDp is the cell ID of the pico base station apparatus eNB2.
- FIG. 9 is a schematic block diagram showing an example of the configuration of the mobile station apparatus according to this embodiment.
- FIG. 9 differs from FIG. 7 only in the parameter storage unit 704.
- Other configurations are the same, and the description of the same processing as in the previous embodiment is omitted.
- the parameter storage unit 704 stores the notified parameter set.
- the parameter storage unit 704 stores the designated parameter set.
- the included carrier frequency information is output to transmitting section 511
- the cell ID information is output to reference signal generating section 207
- the other parameter set information is output to transmitting signal generating section 208. Since other processes are the same as those in the previous embodiment, description thereof is omitted.
- the configuration of the pico base station apparatus eNB2 according to the present embodiment is the same as that of the previous embodiment, and a description thereof will be omitted because it becomes FIG.
- Embodiments 1 to 3 show a method of determining a base station apparatus that transmits an A-SRS based on information indicating a PDCCH format or an A-SRS parameter set included in the PDCCH format.
- the macro base station apparatus may specify the determination method of the base station apparatus that transmits the A-SRS by the control information notification method, and notifies the A-SRS transmission instruction using the E-PDCCH (Enhanced PDCCH).
- E-PDCCH Enhanced PDCCH
- it may be specified by notifying an A-SRS transmission instruction on the PDCCH.
- the mobile station apparatus is instructed to transmit A-SRS to the pico base station apparatus, and when A-SRS transmission is instructed by E-PDCCH.
- the mobile station apparatus is instructed to transmit A-SRS to the macro base station apparatus.
- the macro base station apparatus can instruct the mobile station apparatus supporting E-PDCCH to transmit A-SRS to the small cell, and the mobile station apparatus that does not support E-PDCCH, for example, Rel.
- a mobile station apparatus or the like can instruct A-SRS transmission to a macro base station apparatus as before, and can control in consideration of backward compatibility.
- the mobile station device connected to the macro base station device eNB1 can transmit an A-SRS to the pico base station device eNB2, and the pico base station device eNB2
- the propagation path characteristics can be grasped. Therefore, the macro base station apparatus eNB1 can instruct a connection to the pico base station apparatus eNB2 for a mobile station apparatus with good propagation path characteristics between the mobile station apparatus and the pico base station apparatus. Further, since the propagation path characteristics can be grasped before the connection instruction to the pico base station apparatus eNB2, overhead required for radio resource allocation by the pico base station apparatus eNB2 is reduced from the connection instruction to the pico base station apparatus eNB2. Can.
- the macro base station apparatus eNB1, the pico base station apparatus eNB2, and a part of the mobile station apparatus UE may be realized by a computer.
- the program for realizing the control function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by a computer system and executed.
- the “computer system” here is a computer system built in the macro base station apparatus eNB1, the pico base station apparatus eNB2, or the mobile station apparatus UE, and includes hardware such as an OS and peripheral devices.
- the “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM or a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” is a medium that dynamically holds a program for a short time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, In such a case, a volatile memory inside a computer system serving as a server or a client may be included and a program that holds a program for a certain period of time.
- the program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.
- a part or all of the macro base station apparatus eNB1, the pico base station apparatus eNB2, or the mobile station apparatus UE according to the above-described embodiment may be realized as an integrated circuit such as an LSI (Large Scale Integration).
- LSI Large Scale Integration
- Each functional block of the macro base station apparatus eNB1, the pico base station apparatus eNB2, or the mobile station apparatus UE may be individually converted into a processor, or a part or all of them may be integrated into a processor.
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. Further, in the case where an integrated circuit technology that replaces LSI appears due to progress in semiconductor technology, an integrated circuit based on the technology may be used.
- eNB1 ... macro base station device, eNB2 ... pico base station device, UE1 to UE3 ... mobile station device, 101 ... UE information management unit, 102 ... cell identifier management unit, 103 ... parameter determination unit, 104 ... connection instruction UE selection unit, DESCRIPTION OF SYMBOLS 105 ... Control information generation part, 106 ... Inter-base station communication part, 107 ... Transmission processing part, 108 ... Transmission part, 109 ... Transmission antenna, 110 ... Reception antenna, 111 ... Reception part, 112 ... Reception processing part, 113 ... Propagation Route estimation unit, 200 ... reception antenna, 201 ... reception unit, 202 ... reception processing unit, 203 ...
- reference signal parameter acquisition unit 204 ... parameter storage unit, 205 ... control information format identification unit, 206 ... reference signal transmission instruction identification unit 207: Reference signal generation unit 208: Transmission signal generation unit 209 ... Transmission processing unit 211 ... Transmission unit 210-1 to 210-N DESCRIPTION OF SYMBOLS ... Transmission antenna, 301 ... Reception antenna, 302 ... Reception part, 303 ... Inter-base station communication part, 304 ... Reception processing part, 305 ... Reference signal reception part, 306 ... Propagation path estimation part, 402 ... Carrier frequency management part, 403 ... parameter determination unit, 504 ... parameter storage unit, 511 ... transmission unit, 602 ... picocell information management unit, 603 ... parameter determination unit, 704 ... parameter storage unit
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Abstract
Description
図1は、本発明の第1の実施形態に係るセルラシステムの上り回線の概略図である。図1のセルラシステムでは、広いカバレッジ(セル半径が大きい)のマクロ基地局装置eNB1が存在し、マクロ基地局装置eNB1のセル内にセル半径が小さいスモールセル(図中の斜線の領域)を構成するピコ基地局装置eNB2が存在し、いずれかの基地局装置へ接続する移動局装置UE1、UE2、UE3が存在する。ここで、マクロ基地局装置eNB1とピコ基地局装置eNB2はセルIDが異なる。セルIDは、物理セルID(PCID:Physical Cell ID)であっても仮想セルID(VCID:Virtual Cell ID)であっても良い。同図では、移動局装置UE1、UE2、UE3がマクロ基地局装置eNB1に接続している場合であるが、マクロ基地局装置eNB1はオフロードの目的で移動局装置UE1、UE2をピコ基地局装置eNB2へ接続指示を行うことができる。マクロ基地局装置eNB1は、オフロードする移動局装置を決定するために、ピコ基地局装置eNB2への接続指示の前に、オフロードの候補の移動局装置に対して、ピコ基地局装置用eNB2のパラメータセットによるA-SRS送信指示をすることができる。そのため、マクロ基地局装置eNB1は、ピコ基地局装置eNB2に接続指示を行う移動局装置を伝搬路特性に基づき適切に決定することできる。さらに、ピコ基地局装置eNB2に接続指示からピコ基地局装置eNB2が無線リソース割当までのオーバヘッドが削減されることができる。本明細書中では、ピコ基地局装置eNB2が構成するスモールセルがマクロ基地局装置eNB1の構成するセル(マクロセル)に含まれる場合のみについて記載しているが、スモールセルの一部がマクロセルに含まれる場合やスモールセルがマクロセルに含まれない場合に本発明を適用しても良い。
本実施形態では、マクロ基地局装置eNB1とピコ基地局装置eNB2のセルIDは同じであり、使用する搬送波周波数が違う場合について説明する。例えば、マクロ基地局装置eNB1が2GHz帯を使用し、ピコ基地局装置eNB2が3.5GHz帯を使用する場合などである。
本実施形態では、マクロ基地局装置eNB1とピコ基地局装置eNB2のセルIDと、使用する搬送波周波数の両方が違う場合について説明する。
Claims (5)
- 移動局装置に制御情報を送信する第1のセルを構成する第1の基地局装置であって、前記第1のセル内に第2の基地局装置が構成する第2のセルが存在し、前記第1の基地局装置が前記第1のセル内の移動局装置に参照信号の送信の指示をする制御情報内に、前記第1の基地局装置と第2の基地局装置のいずれかに参照信号を送信することを指定する情報と、前記制御情報内で指示された基地局装置に参照信号の送信で用いる送信パラメータの情報を含み、前記移動局装置へ前記制御情報を通知することを特徴とする第1の基地局装置。
- 前記第1の基地局装置と第2の基地局装置のいずれかに参照信号を送信することを指定する情報は、セルIDであることを特徴とする請求項1の第1の基地局装置。
- 前記第1の基地局装置と第2の基地局装置のいずれかに参照信号を送信することを指定する情報は、搬送波周波数であることを特徴とする請求項1の第1の基地局装置。
- 前記第1の基地局装置は、移動局装置に前記第1の基地局装置へ送信する参照信号のパラメータと第2の基地局装置へ送信する参照信号のパラメータの両方を予め通知することを特徴とする請求項1の第1の基地局装置。
- 前記第1の基地局装置は、参照信号の送信指示する制御情報の種類により参照信号を送信する基地局装置を指定することを特徴とする請求項4の第1の基地局装置。
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EP2942888B1 (en) * | 2013-01-07 | 2018-08-01 | LG Electronics Inc. | Method for receiving a downlink signal from a plurality of transmission points by a user equipment and corresponding user equipment |
CN104038967A (zh) * | 2013-03-06 | 2014-09-10 | 电信科学技术研究院 | 一种数据流传输方法及装置 |
US11102748B2 (en) * | 2016-08-30 | 2021-08-24 | Telefonaktiebolaget Lm Ericsson (Publ) | Inter network cell relationship mapping |
US10630377B2 (en) * | 2016-11-10 | 2020-04-21 | Cable Laboratories, Inc | Systems and methods for beacon detection infrastructures |
US10656281B2 (en) | 2016-11-10 | 2020-05-19 | Cable Television Laboratories, Inc. | Systems and methods for interference detection in shared spectrum channels |
US10882288B2 (en) * | 2020-02-05 | 2021-01-05 | Chin-San Hsieh | Multifunction mat |
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WO2012046682A1 (ja) * | 2010-10-04 | 2012-04-12 | 株式会社エヌ・ティ・ティ・ドコモ | 無線基地局装置、移動端末装置及び無線通信方法 |
WO2012059064A1 (en) * | 2010-11-03 | 2012-05-10 | Mediatek Inc. | Sounding mechanism and configuration under carrier aggregation |
JP2013197783A (ja) * | 2012-03-19 | 2013-09-30 | Sharp Corp | 基地局、端末、通信方法および集積回路 |
WO2013168793A1 (ja) * | 2012-05-10 | 2013-11-14 | シャープ株式会社 | 端末、基地局、通信方法および集積回路 |
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WO2012046682A1 (ja) * | 2010-10-04 | 2012-04-12 | 株式会社エヌ・ティ・ティ・ドコモ | 無線基地局装置、移動端末装置及び無線通信方法 |
WO2012059064A1 (en) * | 2010-11-03 | 2012-05-10 | Mediatek Inc. | Sounding mechanism and configuration under carrier aggregation |
JP2013197783A (ja) * | 2012-03-19 | 2013-09-30 | Sharp Corp | 基地局、端末、通信方法および集積回路 |
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