WO2012040902A1 - 微基站、微基站干扰协调方法和用户终端 - Google Patents
微基站、微基站干扰协调方法和用户终端 Download PDFInfo
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- WO2012040902A1 WO2012040902A1 PCT/CN2010/077401 CN2010077401W WO2012040902A1 WO 2012040902 A1 WO2012040902 A1 WO 2012040902A1 CN 2010077401 W CN2010077401 W CN 2010077401W WO 2012040902 A1 WO2012040902 A1 WO 2012040902A1
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- subframe
- subframe configuration
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- micro base
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/005—Interference mitigation or co-ordination of intercell interference
- H04J11/0056—Inter-base station aspects
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
-
- 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
- H04L5/0058—Allocation criteria
- H04L5/0073—Allocation arrangements that take into account other cell interferences
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
- H04W16/16—Spectrum sharing arrangements between different networks for PBS [Private Base Station] arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/27—Control channels or signalling for resource management between access points
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Definitions
- Micro base station Micro base station interference coordination method and user terminal
- the present invention relates to transmission techniques in communication systems and, more particularly, to interference coordination techniques in communication systems. Background technique
- the long term evolution of 3GPP follows the traditional homogeneous network, which consists of a hexagonal honeycomb system.
- the Next Generation Wireless Communication System Advanced Long Term Evolution (LTE-A) introduces a heterogeneous network (Heterogeneous Network).
- the LTE-A system consists of a Macro Cell, a Femto Cell, a Pico Cell, a Remote Radio Head (RRH), and a Relay. It not only increases the capacity of the system by deploying new wireless nodes, but also provides better services for users in special areas and optimizes system performance. On the other hand, newly deployed nodes may cause interference to users of the originally deployed cell, and even cause some coverage holes, so an enhanced Inter-Cell Interference Coordination (elCIC) method is needed to further optimize. System performance.
- elCIC Inter-Cell Interference Coordination
- FIG. 1 schematically shows a scenario in which a macro cell and a micro cell interfere with each other in a communication system.
- the micro cells B and C serve the subscribed user group, and the macro cell A serves all users.
- the user If the user is subordinate to a subscriber group that subscribes to the micro cell (for example, the case of the user terminal 100), it can switch to the micro cell to accept the service of the micro base station if it is not subordinate to the user group that subscribes to the micro cell (for example, the case of the user terminal 200) ), it will be strongly interfered by the channel in which the micro cell occupies the same transmission resource, such as interference from the downlink signal of the micro base station. Therefore, it is necessary to perform interference coordination on the micro cell and the macro cell.
- PDCCH Physical Downlink Control Channel
- MBSFN subframes MBSFN subframes
- symbol translation symbol translation
- uplink pseudo subframes uplink pseudo subframes.
- the core idea of the almost empty subframe method is that the downlink subframe of the vacant micro cell is used to reduce the interference of the downlink subframe to the macro cell, but in order to ensure compatibility with the Rel. 8/9 user, the CRS still needs to be sent, and it will be macro.
- the control channel of the cell generates interference.
- the method of MBSFN subframes is to use special subframes to reduce interference to macro cells, where the PDCCH channel of the special subframe is configured with fewer OFDM symbols (for example: 1 OFDM symbol), and the macro user is on the remaining OFDM symbols. Will not be disturbed.
- the core idea of the method of symbol translation is to use the symbol shift to stagger the physical downlink control channel of the macro cell and the control channel of the micro cell, and the micro cell prohibits scheduling the downlink data channel corresponding to the physical downlink control channel time-frequency resource of the macro cell.
- the core idea of the uplink pseudo-subframe method is to configure the macro cell and the micro cell to be different TDD uplink and downlink subframes.
- the uplink subframe of the vacant micro cell is used to eliminate interference to the downlink subframe of the macro cell, and there is no problem that the CRS interferes with the control channel.
- the TDD system has 7 seed frame configurations, as shown in Table 1.
- D represents a downlink subframe
- S represents a special subframe
- U represents an uplink subframe.
- the upstream and downstream switching point periods of the configurations 0, 1, 2, and 6 are 5 ms, and the switching period of the upstream and downstream rows of the configurations 3, 4, and 5 is 10 ms.
- the special subframe includes a downlink part, a protection part, and an uplink part, wherein the third OFDM symbol of the downlink part is used for transmitting the secondary synchronization channel, and the uplink part is occupied by 1 or 2 OFDM symbols, which is used for uplink detection and random access, uplink Probe symbols can only be mapped to time-frequency resources other than random access.
- the inventors of the present invention found that in the macro cell + micro cell scenario, when the user of the macro cell approaches or enters the micro cell, its broadcast channel (PBCH) and synchronization channel (PSS/SSS) ) will be strongly disturbed by tiny areas.
- PBCH broadcast channel
- PSS/SSS synchronization channel
- the currently known methods are basically directed to individual channels (especially for the PDCCH channel), and are not directed to the PDCCH and other channels at the same time, and in particular, there is no interference coordination method for the control channel, the broadcast channel, and the synchronization channel.
- Patent Document 1 BHATTAD Kapil, PALANKI Ravei. Synchronous TDM-based communica-tion in dominant interference scenarios (WO 2010006285 A2)
- WO 2010009999 Al A method for coordination of the interference in downlink or uplink between cells of radio communication network, a terminal and a radio communication network therefor
- Patent Document 6 ⁇ , an inter-cell interference coordination method and interference coordination information transmission method thereof (CN 101420746A)
- the present invention has been made in view of the above problems of the conventional art, and at least one advantageous option is provided to solve one or more problems due to the limitations and disadvantages of the conventional techniques.
- a method for coordinating a micro base station interference comprising: causing a subframe in a subframe configuration used by the micro base station to be a subframe in a subframe configuration used by the macro base station Deviating a number of subframes, wherein the number of the offset subframes is such that the subframe corresponding to the specific channel in the subframe configuration used by the macro base station in the subframe configuration used by the micro base station is not transmitted after the offset And the uplink subframe corresponding to the downlink subframe that includes the specified channel in the subframe configuration used by the macro base station in the subframe configuration used by the offset base station; and Making a subframe corresponding to a specific channel in a subframe configuration used by the macro base station in a subframe configuration used by the offset micro base station or vacating a portion corresponding to the specific channel in the subframe No signal is transmitted.
- a micro base station includes: a shifting unit, wherein a subframe in a subframe configuration used by the micro base station is configured in a subframe configuration used by the macro base station
- the subframe is offset by a number of subframes, wherein the number of the offset subframes is such that after the offset, the subframe corresponding to the specific channel in the subframe configuration used by the macro base station in the subframe configuration used by the micro base station
- the frame does not transmit the unadjusted signal of the micro base station; the uplink subframe vacant unit, and the inclusion in the subframe configuration used by the macro base station in the subframe configuration used by the offset micro base station
- the uplink subframe corresponding to the downlink subframe of the designated channel is vacant; and the scheduling restriction unit is configured to correspond to the specific channel in the subframe configuration used by the macro base station in the subframe configuration used by the offset micro base station
- the subframe is vacant or the portion of the subframe corresponding to the particular channel is not transmitted.
- a logic component readable program which, when executed by the logic component, enables the logic component to implement the aforementioned method, or to make the logic component usable The aforementioned micro base station.
- a logic component readable tangible medium is provided, the logic component readable tangible medium storing the program described above.
- a user equipment includes: a wireless communication unit, where the wireless communication unit receives a downlink subframe that includes a designated channel in a subframe configuration used by a macro base station;
- the sub-frame in the subframe configuration used by the micro-base station is offset from the subframe in the subframe configuration used by the macro base station by a number of subframes, where the number of offset subframes is biased After the shift, the subframe corresponding to the specific channel in the subframe configuration used by the macro base station in the subframe configuration used by the micro base station does not transmit the unadjusted signal of the micro base station;
- the micro base station makes the offset
- the uplink subframe corresponding to the downlink subframe including the designated channel in the subframe configuration used by the macro base station in the subframe configuration used by the latter is vacant; and the micro base station makes the offset a subframe corresponding to a specific channel in a subframe configuration used by the macro base station in a subframe configuration used by the micro base
- the present invention comprehensively considers the interference coordination problem for multiple channels, and proposes a solution for jointly using vacant uplink subframes and subframe shifting for the TDD system.
- the interference problem of the control channel (PDCCH, etc.) and the data channel (PDSCH) is solved by using an uplink null subframe (also called a pseudo subframe) scheme. Since the uplink subframe has no common reference signal (CRS), it solves the problem that the CRS still interferes with the control channel when the downlink vacant subframe is downlink.
- CRS common reference signal
- the problem of PBCH SS/SSS interference is solved by using subframe shift and limit scheduling to ensure normal operation of the interfered macro cell user.
- Fig. 1 schematically shows a scenario in which a macro cell and a micro cell interfere with each other in a communication system.
- FIG. 2 illustrates a micro base station interference coordination method in accordance with an embodiment of the present invention.
- FIG. 3 illustrates a micro base station interference coordination method in accordance with an embodiment of the present invention.
- FIG. 4 and 5 illustrate an embodiment of micro base station interference coordination in accordance with an embodiment of the present invention shown in FIG.
- FIG. 6 illustrates a micro base station interference coordination method in accordance with another embodiment of the present invention.
- FIG. 7 is a schematic diagram showing an interference coordination scheme of a micro base station interference coordination method according to an embodiment of the present invention in a case where a micro base station uses a subframe configuration 0 and a macro base station uses a subframe configuration 1.
- FIG. 8 is a schematic diagram showing an interference coordination scheme of a micro base station interference coordination method according to an embodiment of the present invention in a case where a micro base station uses a subframe configuration 0 and a macro base station uses a subframe configuration 2.
- FIG. 9 is a schematic diagram showing an interference coordination scheme of a micro base station interference coordination method according to an embodiment of the present invention in a case where a micro base station uses a subframe configuration 1 and a macro base station uses a subframe configuration 2.
- FIG. 10 is a schematic diagram showing an interference coordination scheme of the above-described micro base station interference coordination method according to the present invention in the case where the micro base station uses the subframe configuration 2 and the macro base station uses the subframe configuration 6.
- FIG. 11 is a schematic diagram showing an interference coordination scheme of the above-described micro base station interference coordination method according to the present invention in the case where the micro base station uses the subframe configuration 0 and the macro base station uses the subframe configuration 6.
- FIG. 12 is a schematic diagram showing an interference coordination scheme of the above-described micro base station interference coordination method according to the present invention in the case where the micro base station uses the subframe configuration 1 and the macro base station uses the subframe configuration 6.
- FIG. 13 is a schematic diagram showing an interference coordination scheme of the above-described micro base station interference coordination method according to the present invention in the case where the micro base station uses the subframe configuration 3 and the macro base station uses the subframe configuration 4.
- FIG. 14 is a schematic diagram showing an interference coordination scheme of the above-described micro base station interference coordination method according to the present invention in the case where the micro base station uses the subframe configuration 3 and the macro base station uses the subframe configuration 5.
- FIG. 15 is a schematic diagram showing an interference coordination scheme of the above-described micro base station interference coordination method according to the present invention in the case where the micro base station uses the subframe configuration 4 and the macro base station uses the subframe configuration 5.
- 16 is a diagram showing an interference coordination scheme of the above-described micro base station interference coordination method according to the present invention in the case where the micro base station uses the subframe configuration 4 and the macro base station uses the subframe configuration 5.
- FIG. 17 shows a micro base station interference coordination method according to another embodiment of the present invention.
- Figure 18 shows a schematic block diagram of a micro base station in accordance with an embodiment of the present invention.
- the present invention is applicable to the case of a heterogeneous network, i.e., a case where one large cell contains one or more small cells.
- This large cell is referred to as a macro cell, and this small cell is referred to as a micro cell.
- the micro cell may be, for example, a femto cell, a pico cell, or the like.
- the base station used in the micro cell is called a micro base station, and the base station used in the macro cell is called a macro base station.
- a communication system to which an embodiment of the present invention can be applied is, for example, as shown in FIG.
- the diagram of FIG. 1 is also merely exemplary. For example, there may be more micro base stations and more macro base stations, and more users may be available.
- FIG. 2 illustrates a micro base station interference coordination method in accordance with an embodiment of the present invention.
- the micro base station makes the subframe in the subframe configuration used by the micro base station relative to the subframe in the subframe configuration used by the macro base station. Moving a number of subframes, wherein the number of the offset subframes is such that the subframe corresponding to the specific channel in the subframe configuration used by the macro base station in the subframe configuration used by the micro base station is not transmitted after the offset
- the micro base station does not have an adjustable signal. Specific channels such as a broadcast channel, a synchronization channel, a PDSCH channel, a PHICH channel, a PCFICH channel, and the like.
- the micro base station is always synchronized with the macro base station.
- the subframe numbered 0 in the subframe configuration used by the micro base station and the subframe configuration used by the macro base station are numbered 0. Alignment of sub-frames.
- the micro base station offsets the subframe in the subframe configuration used by the micro base station with respect to the subframe in the subframe configuration used by the macro base station, that is, the micro base station operates, so that the subframe configuration used by the micro base station is
- the subframe numbered 0 is no longer aligned with the subframe numbered 0 in the subframe configuration used by the macro base station, but the other numbered subframe in the subframe configuration used by the micro base station and the subframe used by the macro base station.
- the subframe alignment numbered 0 in the configuration For example, when the subframe in the subframe configuration used by the micro base station is shifted to the left by 2 subframes relative to the subframe in the subframe configuration used by the macro base station, the subframe numbered 2 in the subframe configuration used by the micro base station is used. Aligned with a subframe numbered 0 in the subframe configuration used by the macro base station.
- the non-adjustable signal of the micro base station refers to a signal that the micro base station cannot determine whether it can transmit in the transmission of the subframe according to the protocol used by the micro base station. For example, according to the relevant protocol, in configuration 0, the PDCCH signal is always transmitted in the subframe numbered 1, and then the PDCCH signal is a signal that the micro base station does not adjust.
- the uplink subframe corresponding to all or part of the downlink subframes in the subframe configuration used by the macro base station in the subframe configuration used by the offset microcell is vacant.
- the designated subframe in the downlink subframe in the subframe configuration used by the macro base station in the subframe configuration used by the offset micro base station may be included
- the uplink subframe corresponding to the downlink subframe of the channel is vacant.
- the uplink subframe corresponding to all the downlink subframes in the subframe configuration used by the macro base station in the subframe configuration used by the offset micro base station may be vacant.
- the designated channel is, for example, a PDCCH channel, a PDSCH channel, a PHICH channel, a PCFICH channel, or the like.
- Having the uplink subframe vacant (or the uplink vacant subframe) means that the uplink subframe does not transmit a signal or the signal transmitted is very small, for example, only the PUCCH (uplink control channel) signal of the format 1 (for example, NACK, ACK, etc.) is transmitted.
- the uplink data channel (PUSCH) data and the PUCCH signal of format 2 are not transmitted.
- step S203 the subframe corresponding to the specific channel in the subframe configuration used by the macro base station in the subframe configuration used by the offset micro base station is vacant or the subframe is The portion corresponding to the specific channel does not transmit a signal.
- the above steps may be performed when the micro base station is started and synchronized with the macro base station, or when interference coordination is performed. If interference coordination is dynamic, it is triggered by the command-triggered sub-frame; if it is semi-static interference coordination, it is triggered by the command or its own clock when interference coordination is required.
- the command may be from the macro base station.
- FIG. 3 illustrates a micro base station interference coordination method in accordance with an embodiment of the present invention.
- the method of Figure 3 is based on the method of Figure 2 and is refined.
- step S301 the micro base station makes the subframe in the subframe configuration used by the micro base station relative to the subframe in the subframe configuration used by the macro base station. Moving a number of subframes, wherein the number of the offset subframes is such that the subframe corresponding to the broadcast channel in the subframe configuration used by the macro base station in the subframe configuration used by the micro base station is not transmitted after the offset.
- the micro base station does not have an adjustable signal.
- step S302 the uplink subframe corresponding to the downlink subframe including the physical downlink control channel in the subframe configuration used by the macro base station in the subframe configuration used by the offset base station is vacant, or The uplink subframe corresponding to all the downlink subframes in the subframe configuration used by the macro base station in the subframe configuration used by the offset base station is vacant.
- step S303 the subframe corresponding to the broadcast channel in the subframe configuration used by the macro base station in the subframe configuration used by the offset micro base station is vacant or the broadcast in the subframe is made The portion corresponding to the channel does not transmit a signal.
- 4 and 5 illustrate an embodiment of micro base station interference coordination in accordance with the embodiment of FIG. 3 in accordance with the present invention.
- 4 is a schematic diagram of an interference coordination scheme of a micro base station interference coordination method according to an embodiment of the present invention in a case where a micro base station uses a subframe configuration 0 and a macro base station uses a subframe configuration 6.
- the subframe in the subframe configuration used by the micro cell is first shifted to the left by 5 subframes; then the subframe with the number 4 of the vacant micro cell is vacant, which is used as a pseudo subframe to reduce the micro cell to the macro cell.
- Interference of PDCCH, PDSCH, PHICH, PCFICH channel in this subframe is used to solve the problem of interference to the PBCH channel of the macro cell user.
- FIG. 5 is a schematic diagram showing an interference coordination scheme of the above-described micro base station interference coordination method according to the present invention in the case where the micro base station uses the subframe configuration 3 and the macro base station uses the subframe configuration 4.
- the subframe in the subframe configuration used by the micro cell is first shifted to the left by one subframe; then the subframe of the number 2 of the micro cell is vacant, which is used as a pseudo subframe to reduce the micro cell to the macro cell.
- the interference of the PDCCH, the PDSCH, the PHICH, and the PCFICH channel in the subframe; and the PDSCH resource of the portion of the subframe number 1 of the scheduling micro cell that coincides with the macro cell PBCH is restricted, which is used to solve the problem of PBCH channel interference of the macro cell user.
- interference to the PBCH of the macro base station can be reduced, so that the effect of interference coordination can be improved.
- the synchronization channel of the macro cell is interfered, and the technical effect thereof needs to be improved.
- FIG. 6 illustrates a micro base station interference coordination method in accordance with another embodiment of the present invention.
- the method of Figure 6 is based on the method of Figure 2 and is refined.
- step S601 the micro base station makes the subframe in the subframe configuration used by the micro base station relative to the subframe in the subframe configuration used by the macro base station. Moving a number of subframes, wherein the number of the offset subframes is such that the subframes used by the micro base station and the subframes corresponding to the broadcast channel and the synchronization channel in the subframe configuration used by the macro base station are used after the offset.
- the signal that the micro base station does not adjust can not be transmitted.
- step S602 the uplink subframe corresponding to the downlink subframe including the physical downlink control channel in the subframe configuration used by the macro base station in the subframe configuration used by the offset base station is vacant, or The uplink subframe corresponding to all the downlink subframes in the subframe configuration used by the macro base station in the subframe configuration used by the offset base station is vacant.
- step S603 the subframe corresponding to the broadcast channel or the synchronization channel in the subframe configuration used by the macro base station in the subframe configuration used by the offset micro base station is vacant and/or the sub-frame is made The portion of the frame corresponding to the broadcast channel or the synchronization channel does not transmit a signal.
- FIG. 7 is a schematic diagram of an interference coordination scheme of a micro base station interference coordination method according to the embodiment shown in FIG. 6 of the present invention in a case where a micro base station uses subframe configuration 0 and a macro base station uses subframe configuration 1.
- the subframe in the subframe configuration used by the micro cell is first shifted to the right by 4 subframes; then the subframes of the microcells numbered 2 and 7 are vacant, and they are used as pseudo subframes to reduce the microcell pair macro.
- This scheduling limitation can be implemented using silent and puncturing.
- Silent means not mapping data to the corresponding location, and puncturing refers to removing the mapped data of the corresponding location.
- the entire UpPTS area is taken as a part corresponding to the secondary synchronization channel.
- only the six micro resource blocks of the frequency center of the UpPTS region numbered 1, 1 subframe are not required to be scheduled. It can be implemented by the following methods: (1) Reserving multiple resources for the PRACH channel (each PRACH channel occupies 6 resource blocks); (2) Limiting 6 resource blocks of the scheduling frequency center. SP. In this embodiment, a portion corresponding to six resource blocks of the frequency center in the UpPTS region is a portion corresponding to the secondary synchronization channel.
- FIG. 8 is a schematic diagram showing an interference coordination scheme of the above-described micro base station interference coordination method according to the present invention in the case where the micro base station uses the subframe configuration 0 and the macro base station uses the subframe configuration 2.
- the subframe in the subframe configuration used by the micro cell is first shifted to the right by 4 subframes; then the micro cells 2, 4, 7, 9 subframes are vacant, and they are used as pseudo subframes to reduce the micro cell pair macro.
- the UpPTS area of the subframe, that is, the uplink sounding signal and the random access signal do not use the UpPTS area.
- FIG. 9 is a schematic diagram showing an interference coordination scheme of the above-described micro base station interference coordination method according to the present invention in the case where the micro base station uses the subframe configuration 1 and the macro base station uses the subframe configuration 2.
- the subframe in the subframe configuration used by the micro cell is shifted to the left by one subframe; the subframes with the micro cell number 2, 7 are vacant, and they are used as pseudo subframes to reduce the number of subframes.
- the interference of the PDCCH, the PDSCH, the PHICH, and the PCFICH channel of the macro cell in the subframe; the PDSCH resource of the portion of the subframe with the micro cell number 1 being overlapped with the PBCH of the macro cell is restricted, and the micro cell not used number is configured at the same time.
- the UpPTS area of the subframes of 1, 6, that is, the uplink sounding signal and the random access signal do not use the UpPTS area.
- FIG. 10 is a schematic diagram showing an interference coordination scheme of a micro base station interference coordination method according to the present invention in a case where a micro base station uses a subframe configuration 6 and a macro base station uses a subframe configuration 2.
- the micro base station performs the following operations: (1) shifting a subframe in a subframe configuration used by the micro cell to the left by one subframe; (2) a subframe having vacant micro cell numbers 2, 4, and 7, As a pseudo subframe, the interference between the micro cell and the PDCCH, PDSCH, PHICH, and PCFICH channels of the macro cell in the subframe is reduced; (3) the portion of the subframe with the micro cell number 1 being restricted and the PBCH of the macro cell is overlapped.
- the PDSCH resource is configured with the UpPTS area of the subframes numbered 1 and 6 at the same time. That is, the uplink sounding signal and the random access signal do not use the UpPTS area. Similarly, in another embodiment, it is only necessary to limit the six resource blocks of the frequency center of the UpPTS region in which the scheduling micro cell does not use the subframes numbered 1, 1, or 6. It solves the problem of SSS channel interference of macro cell users.
- the method of the present invention further includes using a subframe used by the macro base station in a downlink channel in a subframe configuration used by the micro base station.
- the step of controlling the downlink subframe corresponding to the uplink subframe in the configuration (see step S604).
- FIG. 11 is a schematic diagram showing an interference coordination scheme of the above-described micro base station interference coordination method according to the present invention in the case where the micro base station uses the subframe configuration 0 and the macro base station uses the subframe configuration 6.
- the subframe in the subframe configuration used by the micro cell is first shifted to the left by one subframe; then the uplink subframes with the micro cell number 2, 7 are vacant, and they are used as pseudo subframes to reduce the micro cell pair macro.
- the interference of the PDCCH, the PDSCH, the PHICH, and the PCFICH channel of the cell in the subframe; the PDSCH resource of the portion of the subframe with the micro cell number 1 being overlapped with the PBCH of the macro cell is restricted, and the number of the scheduling micro cell is not limited to 1,
- the UpPTS area of the subframe of 6, that is, the uplink sounding signal and the random access signal do not use the UpPTS area.
- the micro base station also vacates the PDSCH resource of the subframe (downlink subframe) of number 5, and reduces the interference between the microcell and the macrocell uplink and downlink.
- Vacating a downlink subframe means that the downlink subframe does not transmit a signal or only transmits a small number of signals (for example, only a CRS signal is transmitted).
- FIG. 12 is a schematic diagram showing an interference coordination scheme of the above-described micro base station interference coordination method according to the present invention in the case where the micro base station uses the subframe configuration 6 and the macro base station uses the subframe configuration 1.
- the following operations are performed: (1) shifting the subframe in the subframe configuration used by the micro cell to the left by one subframe; (2) the vacant micro cell number is 2, 7 Frames, which serve as pseudo-subframes, reduce the interference of the micro cell to the PDCCH, PDSCH, PHICH, and PCFICH channels of the macro cell in this subframe; (3) Limit the scheduling of the micro cell number 1 to coincide with the macro cell PBCH
- the micro-area is not configured with the UpPTS area of the subframes numbered 1, and 6, that is, the uplink sounding signal and the random access signal do not use the UpPTS area.
- the scheduling of the micro cells it is only necessary to limit the scheduling of the micro cells to 6 resource blocks of the frequency center of the UpPTS region numbered 1 and 6 subframes. (4) Restrict the scheduling of the PDSCH resources in the 8th subframe (downlink), and reduce the interference between the microcell and the macrocell uplink and downlink.
- scheduling restriction on the downlink subframe further includes: when the subframe configuration used by the macro cell and the subframe configuration used by the micro cell are both configurations with a switching point period of 10 ms, if the micro cell Under The downlink subframe corresponding to the downlink subframe including the PSS channel in the macro cell exists in the row subframe, and the micro base station limits the PDCCH of the subframe to 2 OFDM symbols or less, thereby ensuring reliable PSS channel of the macro cell. transmission.
- FIG. 13 is a schematic diagram showing an interference coordination scheme of the above-described micro base station interference coordination method according to the present invention in the case where the micro base station uses the subframe configuration 3 and the macro base station uses the subframe configuration 4.
- the micro base station performs the following operations: (1) a subframe in a subframe configuration used by the micro cell is shifted to the left by one subframe; (2) a subframe with a vacant micro cell number of 2, which is used as a pseudo subframe.
- the micro cell does not use the UpPTS region of the subframe numbered 1, that is, the uplink sounding signal and the random access signal do not use the UpPTS region.
- only six resource blocks of the frequency center of the UpPTS region of the subframe numbered 1 are not limited to be scheduled.
- the PDCCH is not more than 2 OFDM symbols, and the time-frequency resources in the subframes with the micro-cell numbers 6 and 7 are overlapped with the macro-cell SSS and PSS channels.
- FIG. 14 is a schematic diagram showing an interference coordination scheme of the above-described micro base station interference coordination method according to the present invention in the case where the micro base station uses the subframe configuration 3 and the macro base station uses the subframe configuration 5.
- the micro base station performs the following operations: (1) the subframe in the subframe configuration used by the micro cell is shifted to the left by 1 subframe; (2) the subframes with the vacant micro cell number 2 and 4 are used as pseudo.
- Subframe reducing the interference of the micro cell to the PDCCH, PDSCH, PHICH, PCFICH channel of the macro cell in the subframe; (3) limiting the PDSCH resource of the part of the subframe with the micro cell number 1 being overlapped with the macro cell PBCH, At the same time, the UpPTS area of the subframe numbered 1 is not used in the micro area, that is, the uplink sounding signal and the random access signal do not use the UpPTS area. If the interference of the UpPTS part can be tolerated, the micro cell does not need to use the 6 resource blocks of the UpPTS regional frequency center, which is used to solve the problem of the SSS channel interference of the macro cell user; (4) The downlink subframe of the configuration number 7 is configured.
- the PDCCH is not more than 2 OFDM symbols, and the time-frequency resources in the subframes with the micro cell number 6 and 7 are overlapped with the macro cell SSS and the PSS channel, and it is also used to solve the problem of channel interference of the macro cell user SSS and PSS. .
- the micro base station performs the following operations: (1) shifting the subframe in the subframe configuration used by the micro cell to the left by one subframe; (2) the subframe with the vacant micro cell number 2 as the pseudo-sub-frame a frame, reducing interference of the micro cell to the PDCCH, PDSCH, PHICH, and PCFICH channels of the macro cell in the subframe; (3) limiting the PDSCH resource of the part of the subframe with the micro cell number 1 being overlapped with the macro cell PBCH, Configure the micro zone to not use the UpPTS zone of the subframe numbered 1, that is, the uplink probe signal and the random access signal do not use the UpPTS zone.
- the downlink subframe PDCCH with the number of 7 is configured to be no more than 2 OFDM symbols, and the time-frequency resources in the subframes with the micro cell numbers 6 and 7 are overlapped with the macro cell SSS and the PSS channel.
- subframe configuration used by the micro base station and the subframe configuration used by the macro base station are exemplary, and the micro base station and the macro base station can use other subframe configurations.
- FIG. 16 is a schematic diagram showing an interference coordination scheme of a micro base station interference coordination method according to an embodiment of the present invention in a case where a micro base station uses a subframe configuration 6 and a macro base station uses a subframe configuration 4.
- the micro base station performs the following operations: (1) shifting a subframe in a subframe configuration used by the micro cell to the left by one subframe; (2) a subframe in which the vacant micro cell numbers are 2, 7, and 8, As a pseudo subframe, the interference of the micro cell to the PDCCH, PDSCH, PHICH, and PCFICH channels in the corresponding subframe of the macro cell is reduced; (3) the PDSCH of the subframe corresponding to the macro cell PBCH in the subframe of the micro cell number 1 is restricted.
- the micro-zone is configured to not use the UpPTS area of the subframes numbered 1, 1, that is, the uplink sounding signal and the random access signal do not use the UpPTS area. If the interference of the UpPTS part can be tolerated, it is only necessary to configure the micro cell to not use the six resource blocks of the frequency center, which is used to solve the problem of the SSS channel interference of the macro cell user.
- a part of the subframes of the micro cell corresponding to the macro cell PBCH or the synchronization channel (the portion corresponding to the macro cell PBCH or the synchronization channel) is restricted from being scheduled, and in an alternative embodiment, The subframe of the micro cell corresponding to the macro cell PBCH or the synchronization channel is uniformly scheduled to be a downlink null subframe or a vacant special subframe.
- FIG. 17 shows a micro base station interference coordination method according to another embodiment of the present invention. As shown in Fig. 17, it is added to the subframe configuration selecting step S1701 as compared with the method shown in Fig. 6.
- the subframe configuration used by the micro base station can be selected.
- the subframe configuration selected by the micro base station includes more uplink subframes than the subframe configuration included in the subframe configuration used by the macro base station.
- the uplink subframe included in the subframe configuration used by the micro base station is one or two more than the uplink subframe included in the subframe configuration used by the macro base station.
- the subframe configuration to be used selected by the micro base station includes three or more uplink subframes.
- step S1701 is shown and described in conjunction with the embodiment shown in Fig. 6, those skilled in the art will appreciate that this step can also be used with the methods illustrated in Figs. 2 and 3.
- FIG. 18 shows a schematic block diagram of a micro base station in accordance with an embodiment of the present invention.
- a micro base station includes a shift unit 1801, an uplink subframe vacant unit 1802, and a scheduling restriction unit 1803.
- the micro base station may further include a subframe configuration selecting unit 1804.
- the shifting unit 1801 offsets the subframe in the subframe configuration used by the micro base station by a number of subframes relative to the subframe in the subframe configuration used by the macro base station, where the number of the offset subframes is such that the offset , the child used by the micro base station
- the subframe corresponding to the specific channel in the subframe configuration used by the macro base station in the frame configuration does not transmit the signal that the micro base station does not allocate.
- Specific channels such as a broadcast channel, a synchronization channel, a PDSCH channel, a PHICH channel, a PCFICH channel, and the like.
- the uplink subframe vacancy unit 1802 vacates the uplink subframe corresponding to all or part of the downlink subframes in the subframe configuration used by the macro base station in the subframe configuration used by the offset micro base station.
- the uplink subframe vacancy unit 1802 may enable the downlink of the downlink subframe in the subframe configuration used by the macro base station and the specified channel in the subframe configuration used by the micro base station after the offset.
- the uplink subframe corresponding to the subframe is vacant.
- the uplink subframe corresponding to all downlink subframes in the subframe configuration used by the macro base station in the subframe configuration used by the offset micro base station may be vacant.
- the designated channel is, for example, a PDCCH channel, a PDSCH channel, a PHICH channel, a PCFICH channel, or the like.
- the scheduling restriction unit 1803 vacates the subframe corresponding to the specific channel in the subframe configuration used by the macro base station in the subframe configuration used by the offset micro base station or makes the specific channel in the subframe The corresponding part does not transmit a signal.
- the subframe configuration selecting unit 1804 can select a subframe configuration used by the micro base station.
- the subframe configuration selected by the micro base station includes more uplink subframes than the subframe configuration included in the subframe configuration used by the macro base station.
- the subframe configuration used by the micro base station includes one or two more uplink subframes than the subframe configuration included in the subframe configuration used by the macro base station.
- the subframe configuration selected by the micro base station to use includes three or more uplink subframes.
- the above units may be operated when the micro base station is started and synchronized with the macro base station, or may be operated when interference coordination is performed. If interference coordination is dynamic, it is triggered by the command-triggered sub-frame; if it is semi-static interference coordination, it is triggered by the command or its own clock when interference coordination is required.
- the command may be from the macro base station.
- the particular channel therein refers to a broadcast channel.
- the number of the offset subframes is such that the subframe corresponding to the broadcast channel in the subframe configuration used by the macro base station in the subframe configuration used by the micro base station does not transmit the unadjusted signal of the micro base station.
- the scheduling restriction unit 1803 vacates the subframe corresponding to the broadcast channel in the subframe configuration used by the macro base station in the subframe configuration used by the offset micro base station or makes the broadcast channel in the subframe The corresponding part does not transmit a signal.
- the specific channel is a broadcast channel and a synchronization channel
- the synchronization channel includes a primary synchronization channel and a secondary synchronization channel.
- the scheduling restriction unit 1803 makes the described after the offset
- the subframe corresponding to the broadcast channel and the synchronization channel in the subframe configuration used by the macro base station in the subframe configuration used by the micro base station is vacant or the portion corresponding to the broadcast channel and the synchronization channel in the subframe is not transmitted. signal.
- the scheduling restriction unit 1803 further causes, in the subframe configuration used by the offset micro base station, to correspond to a downlink subframe that does not include the specific channel in a subframe configuration used by the macro base station.
- the uplink subframe is vacant.
- the scheduling restriction unit 1803 further vacates the downlink subframe corresponding to the uplink subframe in the subframe configuration used by the macro base station in the subframe configuration used by the offset micro base station.
- the number of offsets varies depending on the subframe configuration used by the micro base station and the subframe configuration used by the macro base station.
- the subframe configuration used by the macro base station and the subframe configuration used by the micro base station are both configurations with a switching point period of 10 ms, and the scheduling limiting unit 1803 is at the micro base station.
- the PDCCH in the downlink subframe is limited to 2 OFDM symbols or less. .
- the uplink subframe used by the micro base station and 0, 1, and 5 used by the macro base station when performing the shift.
- the subframe of 6 corresponds.
- the invention solves the mutual interference problem in the heterogeneous network of the TDD system by the method of orthogonal resource division. It solves the problem of PDCCH/PDSCH channel interference in partial subframes by configuring different uplink and downlink subframe modes, and solves the problem of mutual interference of PBCH SS/SSS channels through subframe shifting. This approach guarantees reliable communication for users who are subject to strong interference.
- the present invention is applicable to scenarios that not only apply to Macro+Femto deployment configurations, but also to Macro+Pico deployment configurations. It is also applicable to TDD wireless communication systems such as Wimax.
- the present invention proposes an enhanced interference coordination scheme for the TDD system. It adopts different configurations for the macro cell and the micro cell, and uses the uplink subframe of the vacant micro cell to reduce the interference of the downlink subframe of the macro cell user, where the downlink channel includes PDCCH, PDSCH, PHICH, and PCFICH.
- the downlink channel includes PDCCH, PDSCH, PHICH, and PCFICH.
- a method of micro cell subframe shift and limit scheduling is used.
- the microcell responds to the TDD configuration of the micro cell and the macro cell to perform corresponding subframe shifting. This time domain interference coordination method eliminates the interference of PDCCH/PBCH/PSS/SSS and ensures reliable transmission of Macro users near the micro area.
- Fig. 19 is a schematic diagram showing a mobile phone used as an example of a user equipment according to an embodiment of the present invention.
- the mobile telephone 10 can be a flip type telephone having a flip cover 15 movable between an open position and a closed position. In Fig. 19, the flip cover 15 is shown in an open position. It should be understood that the mobile telephone 10 can be of other constructions, such as a "longboard type telephone" or "sliding type telephone".
- Mobile phone 10 can include display 14.
- the display 14 displays to the user such as operating status, time, phone number, Information such as phone book information, various menus, etc., enables the user to utilize various features of the electronic device 10.
- Display 14 can also be used to visually display content that is received by electronic device 10 and/or retrieved from a memory (not shown) of mobile phone 10.
- Display 14 can be used to present images, videos, and other graphics to the user, such as photos, mobile television content, and video related to the game.
- keyboard 18 provides a variety of user input operations.
- keyboard 18 may include alphanumeric keys that allow alphanumeric information (e.g., phone number, phone list, phone book information, notepad, text, etc.) to be entered.
- keyboard 18 may include specific function keys 17, such as a "Call Send” button for initiating or answering a call, and a "Call End” button for ending or “hanging up” the call.
- the particular function keys can also include menu navigation keys and selection keys that are conveniently navigated through menus displayed on display 14.
- a pointing device and/or navigation keys can be provided to receive directional inputs from the user.
- the display 14 and the keyboard 18 can be used in combination with each other to realize the function of the soft keys.
- the mobile phone 10 also includes components such as an antenna, a microcontroller, a speaker 50, and a microphone 52 to perform its functions.
- Fig. 20 shows a schematic functional block diagram of the user equipment 10.
- the user equipment 10 includes a wireless communication unit 2001 that receives a downlink subframe including a designated channel in a subframe configuration used by the macro base station.
- the user equipment 10 further includes a decoding unit 2002 that decodes, for example, a subframe received by the wireless communication unit 2001 from the macro base station.
- the user equipment 10 also includes a user interface unit 2003, for example for providing data decoded by the decoding unit 2002 to the user. For example, images and videos, text are provided to the user through the display, and sounds and the like are provided to the user through the speaker 50.
- the user interface unit 2003 receives various operational inputs from the user.
- Fig. 20 indicates the schematic, user equipment 10 also includes other functional modules, which can be implemented in various modules known to those skilled in the art or known in the future.
- the above apparatus and method of the present invention may be implemented by hardware, or may be implemented by hardware in combination with software.
- the present invention relates to a logic component readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to implement the various components described above Method or step.
- Logic components such as field programmable logic components, microprocessors, processors used in computers, and the like.
- the present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash, a magneto-optical disk, a memory card, a memory stick, and the like.
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- Engineering & Computer Science (AREA)
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- Computer Networks & Wireless Communication (AREA)
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Description
Claims
Priority Applications (6)
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CN2010800692036A CN103141129A (zh) | 2010-09-28 | 2010-09-28 | 微基站、微基站干扰协调方法和用户终端 |
JP2013530515A JP2013539304A (ja) | 2010-09-28 | 2010-09-28 | マイクロ基地局、マイクロ基地局の干渉協調方法及びユーザ端末 |
KR1020137010188A KR20130096736A (ko) | 2010-09-28 | 2010-09-28 | 마이크로 기지국, 마이크로 기지국 간섭 조정 방법, 및 사용자 단말 |
PCT/CN2010/077401 WO2012040902A1 (zh) | 2010-09-28 | 2010-09-28 | 微基站、微基站干扰协调方法和用户终端 |
EP10857665.3A EP2624615A4 (en) | 2010-09-28 | 2010-09-28 | MICROBASE STATION, INTERFERENCE COORDINATION PROCESS FOR A MICROBASE STATION AND USER DEVICE |
US13/847,640 US20130208686A1 (en) | 2010-09-28 | 2013-03-20 | Micro base station, micro base station interference coordination method, and user terminal |
Applications Claiming Priority (1)
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PCT/CN2010/077401 WO2012040902A1 (zh) | 2010-09-28 | 2010-09-28 | 微基站、微基站干扰协调方法和用户终端 |
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EP (1) | EP2624615A4 (zh) |
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CN (1) | CN103141129A (zh) |
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US8873477B2 (en) * | 2010-10-29 | 2014-10-28 | Futurewei Technologies, Inc. | System and method for cooperative heterogeneous communications systems |
GB2485387B (en) * | 2010-11-12 | 2013-10-02 | Intellectual Ventures Holding 81 Llc | Wireless communication system, communication unit, and method for scheduling |
US9144069B2 (en) * | 2010-11-12 | 2015-09-22 | Lg Electronics Inc. | Method and device for transmitting and receiving downlink control channel for controlling inter-cell interference in wireless communication system |
US8964684B2 (en) * | 2010-11-16 | 2015-02-24 | Lg Electronics Inc. | Method and apparatus for providing control information |
CN103380579B (zh) | 2011-03-03 | 2016-06-01 | Lg电子株式会社 | 在应用了载波聚合方案的无线通信系统中配置回程链路子帧的方法及其设备 |
US9019928B2 (en) * | 2011-04-06 | 2015-04-28 | Lg Electronics Inc. | Method and apparatus for controlling inter-cell collision in wireless communication system |
WO2013025236A1 (en) * | 2011-08-12 | 2013-02-21 | Intel Corporation | System and method of uplink power control in a wireless communication system |
US8743785B2 (en) * | 2011-08-15 | 2014-06-03 | Futurewei Technologies, Inc. | System and method for reducing interference |
KR20140084103A (ko) * | 2011-10-10 | 2014-07-04 | 엘지전자 주식회사 | 무선통신시스템에서 제어정보 송수신 방법 및 장치 |
CN103096333B (zh) * | 2011-11-08 | 2015-09-09 | 华为技术有限公司 | 物理下行控制信道干扰的协调方法及基站 |
WO2013089344A1 (en) * | 2011-12-15 | 2013-06-20 | Lg Electronics Inc. | Method for reducing interference of user equipment in wireless access system, and the user equipment for the same |
CN109644366B (zh) * | 2016-09-07 | 2020-12-01 | 华为技术有限公司 | 一种通信方法及基站 |
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Also Published As
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US20130208686A1 (en) | 2013-08-15 |
EP2624615A4 (en) | 2014-01-29 |
KR20130096736A (ko) | 2013-08-30 |
EP2624615A1 (en) | 2013-08-07 |
JP2013539304A (ja) | 2013-10-17 |
CN103141129A (zh) | 2013-06-05 |
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