US9270436B2 - Method and apparatus for configuring cell-specific reference signal - Google Patents

Method and apparatus for configuring cell-specific reference signal Download PDF

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US9270436B2
US9270436B2 US14/128,186 US201114128186A US9270436B2 US 9270436 B2 US9270436 B2 US 9270436B2 US 201114128186 A US201114128186 A US 201114128186A US 9270436 B2 US9270436 B2 US 9270436B2
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crs
cell
power
difference
epre
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US20140133426A1 (en
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Xuebin Liu
Lian Li
Hui Dong
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Xian Zhongxing New Software Co Ltd
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ZTE Corp
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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
    • H04L5/0053—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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/143—Downlink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/16—Deriving transmission power values from another channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/283—Power depending on the position of the mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/325—Power control of control or pilot channels

Definitions

  • the disclosure relates to the field of mobile communications, and in particular to a method and an apparatus for configuring a Cell-Specific Reference Signal (CRS).
  • CRS Cell-Specific Reference Signal
  • a Reference Signal In a fourth-generation mobile communication Long Term Evolution (LTE) system, a Reference Signal (RS) is a pilot signal known to a receiving end, facilitating the receiving end to implement channel estimation and relevant measurement.
  • the RS plays a very import role in demodulation of receiving signals, elimination of interference, improvement of a Signal Interference Noise Ratio (SINR), cell reselection and handover of a User Equipment (UE, also referred to as terminal) and the like.
  • SINR Signal Interference Noise Ratio
  • UE User Equipment
  • a CRS transmitted to a UE from an Evolved NodeB (eNB) of LTE is a common RS, which is continuously broadcasted in a cell to facilitate all UEs in the cell to estimate and measure quality of a downlink channel of the cell.
  • LTE Compared with in third-generation mobile communications, a single cell can obtain a higher spectrum efficiency in LTE.
  • inter-cell interference is very serious, which significantly reduces the spectrum efficiency. Therefore, LTE put forwards Inter Cell Interference Coordination (ICIC) technology, as shown in FIG. 1 .
  • a cell is divided into a cell central area and a marginal area (a white area represents a central area, and an area with a textured pattern represents a marginal area; in some ICIC schemes, a cell is also divided into three areas, i.e., an inner circle, a middle circle and an outer circle).
  • FIG. 1 A cell is divided into a cell central area and a marginal area (a white area represents a central area, and an area with a textured pattern represents a marginal area; in some ICIC schemes, a cell is also divided into three areas, i.e., an inner circle, a middle circle and an outer circle).
  • FIG. 1 A cell is divided into a cell central area and a marginal area (a white
  • cell 1 shows 7 cells (i.e., cell 1 to cell 7), in which cell 1 and each of the other 6 cells (i.e., cell 2 to cell 7) are adjacent to each other.
  • a UE in the central area of a cell can use total transmission resources, while a UE in the marginal area (i.e., a switching area connecting a neighbour cell) of the cell can only use a part of transmission resources.
  • resources used by UEs in marginal areas of adjacent cells are different, that is, the resources are orthogonal to each other.
  • Transmission resources might be frequency-domain resources, for example, frequency bands.
  • FIG. 2 shows ICIC based on frequency domain, in which the entire frequency band F can be used in the central area of a cell while only a part of the entire frequency band (for example, F1, F2, or F3) can be used in the marginal area of the cell. Moreover, frequency band used in marginal areas of adjacent cells are different.
  • Transmission resources may also be time-domain resources, for example, time segments.
  • FIG. 3 shows ICIC based on time domain, in which the entire time segment T can be used in the central area of a cell while only a part of the entire time segment (for example, T1, T2, or T3) can be used in the marginal area of the cell. Moreover, time segments used in marginal areas of adjacent cells are different.
  • a specific power is generally set for a “dedicated channel” of a UE according to an area in which the UE is located. For example, in the ICIC based on frequency domain, a specific power is set for a Physical Downlink Shared Channel (PDSCH) allocated to a UE to bear UE dedicated data in a specific frequency band; in the ICIC based on time domain, specific powers are set for a Physical Downlink Control Channel (PDCCH) and a PDSCH allocated to a UE to bear UE dedicated scheduling information and UE dedicated data in a specific time segment respectively.
  • PDSCH Physical Downlink Shared Channel
  • PDCCH Physical Downlink Control Channel
  • the specific setting is mainly to improve the power of marginal transmission resources and reduce the power of central transmission resources.
  • a common channel or common signal of all UEs in a cell such as a Physical Broadcasting Channel (PBCH), a Physical Control Format Indicator Channel (PCFICH), a Physical Hybrid ARQ Indicator Channel (PHICH), a common PDCCH bearing scheduling information on a Broadcasting Channel (BCH) and a Paging Channel (PCH), a common PDSCH bearing data on a BCH and a PCH, and a CRS), that is, a reference power is adopted.
  • the Energy per Resource Element (EPRE) of the CRS is generally a cell-level fixed value configured by a background network manager through network planning and network optimization, that is, the transmitting power of each Resource Element (RE) of the CRS is fixed and same by default.
  • each small square represents one RE
  • square T 01 represents the RE of the CRS of cell 1
  • square T 02 represents the RE of the CRS of cell 2
  • square D represents the RE of data
  • cell 1 and cell 2 are adjacent to each other, and the RE frequency domain position of the CRS of cell 1 is staggered from that of the CRS of cell 2.
  • Embodiments of the disclosure provide a method and an apparatus for configuring a CRS, so as to solve the problem that an existing CRS produces co-channel interference on a dedicated channel and a common channel in a neighbour cell that are on the same symbol as the CRS.
  • a cell is divided into a central area and a marginal area
  • the CRS is divided into a central CRS, a marginal CRS and a common CRS, wherein the central CRS is a CRS located on the transmission resource section used by the central area of the cell and is on the same symbol as the dedicated channel of the central area; the marginal CRS is a CRS located on the transmission resource section used by the marginal area of the cell and is on the same symbol as the dedicated channel of the marginal area; and the common CRS is a CRS adjacent to and is on the same symbol as the frequency domain of the downlink common channel, other than the central CRS and the marginal CRS;
  • EPRE Energy Per Resource Element
  • a value that is obtained by subtracting a fixed second power value from the preset reference EPRE is configured as an EPRE value of the central CRS
  • the reference EPRE is configured as the EPRE value of the common CRS.
  • a cell division unit configured to divide a cell into a central area and a marginal area
  • a CRS division unit configured to divide the CRS into a central CRS, a marginal CRS and a common CRS
  • the central CRS is a CRS which is located on a transmission resource section used in the central area of the cell and is on a same symbol as a dedicated channel of the central area
  • the marginal CRS is a CRS which is located on a transmission resource section used in the marginal area of the cell and is on a same symbol as a dedicated channel of the marginal area
  • the common CRS is a CRS, except for the central CRS and the marginal CRS, which is adjacent to a downlink common channel in frequency domain and is on the same symbol as the downlink common channel
  • a configuration unit configured to: configure a value that is obtained by adding a fixed first power value to a preset reference Energy Per Resource Element (EPRE), as an EPRE value of the marginal CRS; configure a value that is obtained by subtracting a fixed second power value from the preset reference EPRE, as an EPRE value of the central CRS; and configure the reference EPRE as an EPRE value of the common CRS.
  • EPRE Energy Per Resource Element
  • the CRS is divided into a central CRS, a marginal CRS and a common CRS on the basis of dividing a cell into a central area and a marginal area in the existing ICIC technology, wherein the EPRE of the central CRS is reduced by certain power on the basis of a preset reference EPRE, and the EPRE of the marginal CRS is raised by certain power on the basis of the preset reference EPRE. Therefore, without affecting the downlink performance of a UE in the central area of a cell, an SINR of a marginal area of the cell can be improved and the downlink performance of a UE in the marginal area of the cell can be enhanced.
  • FIG. 1 shows a diagram of dividing each cell into a central area and a marginal area in existing ICIC technology
  • FIG. 2 shows a diagram of frequency domain division in the frequency-domain based ICIC in the related art
  • FIG. 3 shows a diagram of time domain division in the time-domain based ICIC in the related art
  • FIG. 4 shows a diagram of CRS-REs of adjacent cells staggered in frequency domain positions in the related art
  • FIG. 5 shows a flowchart of a method for configuring a CRS provided by an embodiment of the disclosure
  • FIG. 6 shows a diagram of a CRS provided by an embodiment of the disclosure
  • FIG. 7 shows a structure diagram of an apparatus for configuring a CRS provided by an embodiment of the disclosure
  • FIG. 8 shows a first diagram of the structure of a configuration unit provided by an embodiment of the disclosure.
  • FIG. 9 shows a second diagram of the structure of a configuration unit provided by an embodiment of the disclosure.
  • a method for configuring a CRS provided by an embodiment of the disclosure is elaborated first.
  • the method for configuring a CRS includes: the power of the CRS is adjusted on the basis of dividing a cell into a central area and a marginal area in the existing ICIC technology and adjusting the power of dedicated channels (a PDSCH bearing UE dedicated data and a PDCCH bearing UE dedicated scheduling information) of a marginal area and a central area of a cell.
  • the method as shown in FIG. 5 , includes:
  • S 501 A cell is divided into a central area and a marginal area.
  • a CRS is divided into a central CRS, a marginal CRS and a common CRS.
  • the central CRS is a CRS which is located on a transmission resource section used in the central area of the cell and which is on the same symbol as a dedicated channel of the central area;
  • the marginal CRS is a CRS which is located on a transmission resource section used in the marginal area of the cell and which is on the same symbol as the dedicated channel of the marginal area;
  • the common CRS is a CRS, except for the central CRS and the marginal CRS, which is adjacent to a downlink common channel in frequency domain and which is on the same symbol as the downlink common channel.
  • the dedicated channels include but are not limited to: a PDSCH bearing UE dedicated data (hereinafter referred to as “dedicated PDSCH” in brief) and a PDCCH bearing UE dedicated scheduling information (hereinafter referred to as “dedicated PDCCH” in brief).
  • the common channel includes but is not limited to: a PBCH, a PCFICH, a PHICH, a PDCCH bearing scheduling information of a BCH and a PCH (hereinafter referred to as “common PDCCH” in brief), and a PDSCH bearing data of a BCH and a PCH (hereinafter referred to as “common PDSCH” in brief).
  • the vertical axis represents a time shaft
  • the horizontal axis represents a frequency domain shaft.
  • the small squares with patterns indicates CRSs. That the CRS is on a same symbol as the dedicated channel or common channel refers to that the CRS has the same position as the dedicated channel on the time shaft.
  • a value that is obtained by adding a fixed first power value to a preset reference Energy Per Resource Element (EPRE) is configured as an EPRE value of the marginal CRS.
  • a value that is obtained by subtracting a fixed second power value from the preset reference EPRE is configured as an EPRE value of the central CRS.
  • the reference EPRE is configured as the EPRE value of the common CRS.
  • the values of the first power and the second power can be directly set to the adjusted power value of an EPRE of the dedicated channel in the existing ICIC technology, or can also be adjusted on the basis of the adjusted power value of the EPRE of the dedicated channel in the existing ICIC technology in conjunction with system simulation and network testing. Specifically, two conditions are included as follows.
  • the adjusted power values of the EPREs of the central CRS and the marginal CRS can refer to the adjusted power value of the EPRE of the dedicated PDSCH.
  • a first difference (N1) between the EPRE of the dedicated PDSCH of the marginal area of the cell and the reference EPRE that are set according to the existing ICIC technology is determined, and a second difference (N2) between the EPRE of the dedicated PDSCH of the central area of the cell and the reference EPRE that are set according to the existing ICIC technology is determined.
  • Mode 1 M1 is set directly to N1 and M2 is set directly to N2. That is, a fixed power difference is kept between the adjusted marginal CRS and the dedicated PDSCH of the marginal area of the cell.
  • the adjusted value of the dedicated channel can already achieve the purpose of reducing interference on a neighbour cell and not impacting the performance of the dedicated channel of the central area of the cell, the direct use of the adjusted value on one hand can achieve a similar technical effect and on the other hand can avoid transmitting a new power difference between the CRS and the PDSCH to a UE in the cell, thereby saving some signalling overhead.
  • Mode 2 according to a result of system simulation and network testing, adjustment is made on the basis of N1 to obtain M1, and adjustment is made on the basis of N2 to obtain M2.
  • the adjustment amount of the marginal CRS (or the central CRS) is inconsistent with that of the dedicated PDSCH of the marginal area of the cell (or the dedicated PDSCH of the central area of the cell) which is on the same symbol as the marginal CRS, the power difference between the adjusted CRS and the dedicated PDSCH would be changed. At this moment, it is also needed to inform, through a signalling reconfiguration message, the UE in the cell of the new EPRE power difference between the dedicated PDSCH of the marginal area of the cell and the marginal CRS and the new EPRE power difference between the dedicated PDSCH of the central area of the cell and the central CRS.
  • N1, M1, N2 and M2 must satisfy that: the sum of respective configured powers of the dedicated PDSCH of the central area of the cell and the central CRS, the dedicated PDSCH of the marginal area of the cell and the marginal CRS, the common CRS and the common channel of the cell is, on the same symbol, not greater than the maximum power of the cell.
  • the EPREs of the dedicated PDSCH and the dedicated PDCCH of the central area or marginal area of the cell are adjusted on the basis of a reference power in the existing ICIC technology, respectively. Therefore, in this condition, the adjusted power values of EPRE of the central CRS and the marginal CRS which are on the same symbol as the dedicated PDSCH can refer to the adjusted power value of EPRE of the dedicated PDSCH of the central area and the marginal area of the cell respectively. And, the adjusted power values of the EPREs of the central CRS and the marginal CRS which are on the same symbol as the dedicated PDCCH can refer to the adjusted power values of the EPREs of the dedicated PDCCHs of the central area and the marginal area of the cell respectively.
  • a first difference (N1) between the EPRE of the dedicated PDSCH of the marginal area of the cell and the reference EPRE that are set according to the existing ICIC technology is determined
  • a second difference (N2) between the EPRE of the dedicated PDSCH of the central area of the cell and the reference EPRE that are set according to the existing ICIC technology is determined
  • a third difference (N3) between the EPRE of the dedicated PDCCH of the marginal area of the cell and the reference EPRE that are set according to the existing ICIC technology is determined
  • a fourth difference (N4) between the EPRE of the dedicated PDCCH of the central area of the cell and the reference EPRE that are set according to the existing ICIC technology is determined.
  • the first power value of the EPRE of the marginal CRS which is on the same symbol as the dedicated PDSCH of the marginal area of the cell i.e., the power value needed to be adjusted relative to the reference power value, M1
  • the second power value (M2) of the EPRE of the central CRS which is on the same symbol as the dedicated PDSCH of the central area of the cell the first power value (M3) of the EPRE of the marginal CRS which is on the same symbol as the dedicated PDCCH of the marginal area of the cell
  • the second power value (M4) of the EPRE of central CRS which is on the same symbol as the dedicated PDCCH of the central area of the cell can also be configured through the following two modes.
  • Mode 1 M1 is set directly to N1, M2 is set directly to N2, M3 is set directly to N3, and M4 is set directly to N4. That is, a fixed power difference is kept between the adjusted marginal CRS and the dedicated PDSCH or dedicated PDCCH of the marginal area of the cell which is on the same symbol as the marginal CRS, and a fixed power difference is kept between the adjusted central CRS and the dedicated PDSCH or dedicated PDCCH of the central area of the cell which is on the same symbol as the central CRS. In this way, on one hand, interference of the central CRS on a neighbour cell can be reduced without impacting the performance of the central CRS of the cell; on the other hand, it is not necessary to inform the UE of the power difference, thereby saving some signal overhead.
  • Mode 2 according to a result of system simulation and network testing, adjustment is made on the basis of N1 to obtain M1, and adjustment is made on the basis of N2 to obtain M2, adjustment is made on the basis of N3 to obtain M3, and adjustment is made on the basis of N4 to obtain M4.
  • N1, M1, N2, M2, N3, M3, N4 and M4 must satisfy that: the sum of respective configured powers of the dedicated PDSCH of the central area of the cell and the central CRS which is on the same symbol as the dedicated PDSCH, the dedicated PDSCH of the marginal area of the cell and the marginal CRS which is on the same symbol as the dedicated DPSCH, the dedicated PDCCH of the central area of the cell and the central CRS which is on the same symbol as the dedicated PDCCH, the dedicated PDCCH of the marginal area of the cell and the marginal CRS which is on the same symbol as the dedicated DPCCH, the common CRS and the common channel of the cell is, on the same symbol, not greater than the maximum power of the cell.
  • Example 1 transmission resources are divided based on frequency domain.
  • the frequency bandwidth of an LTE cell is 20 MHz, in which there are 100 available Resource Blocks (RBs), i.e., 1200 REs, Cyclic Prefix (CP) adopts a normal CP, the base station has 2 antennas, and the maximum transmitting power is 40 W, i.e., 46 dBm.
  • RBs Resource Blocks
  • CP Cyclic Prefix
  • the reference power EPRE of the CRS EPRE is 12 dBm
  • Both the power of the PDSCH-RE in the 30-RB frequency band of the marginal area and the power of the CRS-RE which is on the same symbol as the PDSCH-RE are raised by 3 dB on the basis of the original reference power, i.e., becoming 15 dBm.
  • Both the power of the PDSCH-RE in the 60-RB frequency band of the central area and the power of the CRS-RE which is on the same symbol as the PDSCH-RE are reduced by 3 dB on the basis of the original reference power, i.e., becoming 9 dBm.
  • Both the power of the common PDSCH and the power of the common CRS in the rest 10-RB frequency band are not adjusted, and are still kept at 12 dBm.
  • Example 2 transmission resources are divided based on time domain.
  • the frequency bandwidth of an LTE cell is 20 MHz, in which there are 100 available Resource Blocks (RBs), i.e., 1200 REs, Cyclic Prefix (CP) adopts a normal CP, the base station has 2 antennas, and the maximum transmitting power is 40 W, i.e., 46 dBm.
  • RBs Resource Blocks
  • CP Cyclic Prefix
  • one downlink radio frame contains 10 downlink radio Sub Frames (SFs): SF0-SF9; if in LTE of Time Division Duplex (TDD) mode, it is assumed that uplink and downlink configurations are 1, one radio frame contains 6 downlink SFs (SF0, SF1, SF4, SF5, SF6, SF9) and 4 uplink SFs (SF2, SF3, SF7, SF8).
  • SFs are fewer in the TDD mode; it is more complex to implement the ICIC based on time domain, but the principle is similar, which is not further repeated here).
  • the reference power EPRE of CRS-RE is 12 dBm
  • the difference values of the power of PDCCH-RE, PBCH-RE, PCHICH-RE, PHICH-RE and PDSCH-RE relative to the reference power of CRS-RE are set to 0 dB respectively, that is, the powers of PDCCH-RE, PBCH-RE, PCHICH-RE, PHICH-RE and PDSCH-RE are set to 12 dBm respectively.
  • a cell is divided into a central area and a marginal area, wherein the marginal area is allocated with time segment resources of 3 SFs, the central area is allocated with time segment resources of 6 SFs (if not occupied, the time segment resources of the marginal area can be temporarily turned into time segment resources of the central area to be used), and the rest 1-SF time segment resources are reserved for the common channel and the common CRS.
  • the marginal area time segment resources of the PDCCH differ by 4 SFs from that of the PDSCH, and the central area time segment resources of the PDCCH also differ by 4 SFs from that of the PDSCH.
  • PDSCH downlink time segments allocated to the marginal area are “SF1 & SF2 & SF3”, then PDSCH downlink time segments are “SF5 & SF6 & SF7”; if the PDCCH downlink time segments allocated to the central area are “SF4 & SF5 & SF6 & SF7 & SF8 & SF9”, then PDSCH downlink time segments are “SF8 & SF9 & SF0 & SF1 & SF2 &SF3”; and SF0 is allocated to the downlink common PDCCH, and SF4 is allocated to the downlink common PDSCH.
  • the power of the dedicated PDCCH in the central area SFs of PDCCH and the power of the central CRS which is on the same symbol as the dedicated PDCCH, and the power of the dedicated PDSCH in the central area SFs of PDSCH and the power of the central CRS which is on the same symbol as the dedicated PDSCH all are reduced by 3 dB or more on the basis of the reference power, while the power of the common channel (such as, the PBCH, the PCFICH, the PHICH, the common PDCCH, or the common PDSCH) and the power of the common CRS which is adjacent to the common channel in frequency domain and is on the same symbol as the common channel keep unchanged. Since power is reduced, it is impossible to appear power overload.
  • the common channel such as, the PBCH, the PCFICH, the PHICH, the common PDCCH
  • the method for configuring a CRS enables the marginal CRS to borrow the power of the central CRS, in this way, power sharing is realized, and the difference in coverage between the central area and the marginal area is reduced.
  • the coverage of the cell is more even, the fairness of cell coverage is improved and the utilization efficiency of power is improved.
  • the power of the marginal CRS of the cell is enhanced, co-channel interference on the marginal CRS of the cell from a channel, which is on the same symbol as the marginal CRS in a neighbour cell is reduced.
  • the downlink performance of the UE in the marginal area of the cell is significantly improved under the premise of not impacting the function of the CRS.
  • amplitude weighting is performed on the CRS, which is similar to construct a virtual radio transmission channel having a special amplitude-frequency response characteristic (the amplitude-frequency response of the central transmission resource section is low, and the amplitude-frequency response of the marginal transmission resource section is high) before a real radio transmission channel.
  • the adjustment can be considered as transparent. If all cells in a network adopt this method, no impact would be caused to the UE in the measurement of downlink CQI under full bandwidth, and no impact would be caused to cell reselection and handover of the UE.
  • the UE since the UE supports the measurement of sub-band CQI of part bandwidths, no problem would be caused to the demodulation of downlink signal performed by UE based on CRS channel estimation.
  • an eNB since an eNB knows the power adjustment of the CRS in the cell, impact can be eliminated through a compensation algorithm, so as to restore the real condition of a radio transmission channel.
  • the method for configuring a CRS provided by the embodiment of the disclosure has little impact on the existing network, which can be neglected basically, thus facilitating implementation of the method in the existing network.
  • an embodiment of the disclosure also provides an apparatus for configuring a CRS. Since the principle of the apparatus for configuring a CRS in solving a problem is similar to the method for configuring a CRS, the implementation of the apparatus can refer to the implementation of the above method, which is not repeated.
  • An apparatus for configuring a CRS provided by an embodiment of the disclosure, as shown in FIG. 7 includes:
  • a cell division unit 701 configured to divide a cell into a central area and a marginal area
  • a CRS division unit 702 configured to divide the CRS into a central CRS, a marginal CRS and a common CRS, wherein the central CRS is a CRS which is located on a transmission resource section used in the central area of the cell and is on a same symbol as a dedicated channel of the central area; the marginal CRS is a CRS which is located on a transmission resource section used in the marginal area of the cell and is on a same symbol as a dedicated channel of the marginal area; and the common CRS is a CRS, except for the central CRS and the marginal CRS, which is adjacent to a downlink common channel in frequency domain and is on the same symbol as the downlink common channel; and
  • a configuration unit 703 configured to: configure a value that is obtained by adding a fixed first power value to a preset EPRE, as an EPRE value of the marginal CRS; configure a value that is obtained by subtracting a fixed second power value from the preset reference EPRE, as an EPRE value of the central CRS; and configure the reference EPRE as an EPRE value of the common CRS.
  • the configuration unit 703 further includes: a determination subunit 801 and a value setting subunit 802 .
  • the determination subunit 801 is configured to determine a first difference between an EPRE of a preset dedicated PDSCH of the marginal area of the cell and the reference EPRE, and determine a second difference between an EPRE of a preset dedicated PDSCH of the central area of the cell and the reference EPRE.
  • the value setting subunit 802 is configured to set the first difference as the first power value and set the second difference as the second power value.
  • the determination subunit 801 is configured to determine a first difference between an EPRE of a preset dedicated PDSCH of the marginal area of the cell and the reference EPRE, and determine a second difference between an EPRE of a preset dedicated PDSCH of the central area of the cell and the reference EPRE.
  • the value setting subunit 802 is configured to, according to a result of system simulation and network testing, adjust the first difference to obtain the first power value and adjust the second difference to obtain the second power value.
  • the apparatus for configuring a CRS provided by the embodiment of the disclosure, as shown in FIG. 7 , further includes: a signalling reconfiguration message transmitting unit 704 , configured to inform, through a signalling reconfiguration message, a UE in the cell of a power difference between the configured EPRE of the dedicated PDSCH of the marginal area of the cell and the configured EPRE of the marginal CRS which is on the same symbol as the dedicated PDSCH and a power difference between the configured EPRE of the dedicated PDSCH of the central area of the cell and the configured EPRE of the central CRS which is on the same symbol as the dedicated PDSCH.
  • a signalling reconfiguration message transmitting unit 704 configured to inform, through a signalling reconfiguration message, a UE in the cell of a power difference between the configured EPRE of the dedicated PDSCH of the marginal area of the cell and the configured EPRE of the marginal CRS which is on the same symbol as the dedicated PDSCH and a power difference between the configured EPRE of the dedicated PDSCH of the central area of the
  • the first difference, the first power value, the second difference and the second power value must satisfy that: the sum of powers of the configured dedicated PDSCH of the central area of the cell and the configured central CRS, the configured dedicated PDSCH of the marginal area of the cell and the configured marginal CRS, the configured common CRS and the configured common channel of the cell is, on a same symbol, not greater than the maximum power of the cell.
  • the configuration unit 703 further includes: a determination subunit 901 and a value setting subunit 902 .
  • the determination sub-unit 901 is configured to: determine a first difference between an EPRE of a preset dedicated PDSCH of the marginal area of the cell and the reference EPRE; determine a second difference between an EPRE of a preset dedicated PDSCH of the central area of the cell and the reference EPRE; determine a third difference between an EPRE of a preset dedicated PDCCH of the marginal area of the cell and the reference EPRE; and determine a fourth difference between an EPRE of a preset dedicated PDCCH of the central area of the cell and the reference EPRE.
  • the value setting subunit 902 is configured to: set the first difference as a first power value of a marginal CRS which is on the same symbol as the dedicated PDSCH; set the second difference as a second power value of a central CRS which is on the same symbol as the dedicated PDSCH; set the third difference as a first power value of a marginal CRS which is on the same symbol as the dedicated PDCCH; and set the fourth difference as a second power value of a central CRS which is on the same symbol as the dedicated PDCCH.
  • the determination sub-unit 901 is configured to: determine a first difference between an EPRE of a preset dedicated PDSCH of the marginal area of the cell and the reference EPRE; determine a second difference between an EPRE of a preset dedicated PDSCH of the central area of the cell and the reference EPRE; determine a third difference between an EPRE of a preset dedicated PDCCH of the marginal area of the cell and the reference EPRE; and determine a fourth difference between an EPRE of a preset dedicated PDCCH of the central area of the cell and the reference EPRE.
  • the value setting subunit 902 is configured to: according to a result of system simulation and network testing, adjust the first difference, the second difference, the third difference and the fourth difference respectively to obtain the first power value of the marginal CRS which is on the same symbol as the dedicated PDSCH, the second power value of the central CRS which is on the same symbol as the dedicated PDSCH, the first power value of the marginal CRS which is on the same symbol as the dedicated PDCCH and the second power value of the central CRS which is on the same symbol as the dedicated PDCCH.
  • the configuration apparatus for configuring a CRS provided by the embodiment of the disclosure further includes: a signalling reconfiguration message transmitting unit 704 , configured to inform, through a signalling reconfiguration message, a User Equipment (UE) in the cell of a power difference between the configured EPRE of the dedicated PDSCH of the marginal area of the cell and the configured EPRE of the marginal CRS which is on the same symbol as the dedicated PDSCH and a power difference between the configured EPRE of the dedicated PDSCH of the central area of the cell and the configured EPRE of the central CRS which is on the same symbol as the dedicated PDSCH.
  • UE User Equipment
  • the first difference, the first power value of the marginal CRS which is on the same symbol as the dedicated PDSCH, the second difference, the second power value of the central CRS which is on the same symbol as the dedicated PDSCH, the third difference, the first power value of the marginal CRS which is on the same symbol as the dedicated PDCCH, the fourth difference, and the second power value of the central CRS which is on the same symbol as the dedicated PDCCH satisfy that: the sum of powers of the configured dedicated PDCCH, the configured dedicated PDSCH of the central area of the cell, the configured central CRS, the configured dedicated PDCCH, the configured dedicated PDSCH of the marginal area of the cell, the configured marginal CRS, the configured common CRS and the configured common channel of the cell is, on a same symbol, not greater than the maximum power of the cell.
  • the CRS is divided into a central CRS, a marginal CRS and a common CRS on the basis of dividing a cell into a central area and a marginal area in the existing ICIC technology, wherein the EPRE of the central CRS is reduced by certain power on the basis of a preset reference EPRE, and the EPRE of the marginal CRS is raised by certain power on the basis of the preset reference EPRE. Therefore, without affecting the downlink performance of a UE in the central area of a cell, an SINR of a marginal area of the cell can be improved and the downlink performance of a UE in the marginal area of the cell can be enhanced.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160094374A1 (en) * 2014-09-26 2016-03-31 Telefonaktiebolaget L M Ericsson (Publ) Discovery signal design
US20170311144A1 (en) * 2014-01-28 2017-10-26 Qualcomm Incorporated Discovery signals and network synchronization signals design in lte

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103281768B (zh) * 2013-06-14 2016-05-04 大唐移动通信设备有限公司 一种crs功率的确定方法和设备
WO2015077931A1 (en) * 2013-11-27 2015-06-04 Telefonaktiebolaget L M Ericsson (Publ) A method, base station and computer-readable storage media for downlink power allocation in a wireless communication system
US9854532B2 (en) * 2014-12-05 2017-12-26 Telefonaktiebolaget Lm Ericsson (Publ) Method, network nodes, and computer program products for load based adaptive CRS power adjustment
CN106941716A (zh) * 2016-01-04 2017-07-11 中兴通讯股份有限公司 一种小区公共参考信号的发送方法、装置及基站
CN111447688B (zh) * 2017-07-08 2023-04-07 上海琦予通信科技服务中心 一种被用于动态调度的用户设备、基站中的方法和装置
CN107484192B (zh) * 2017-09-06 2021-01-26 中兴通讯股份有限公司 功率处理方法及装置、存储介质
CN110391887B (zh) * 2018-04-20 2021-11-09 华为技术有限公司 信号处理方法及装置
CN110474698B (zh) * 2018-05-11 2022-03-01 中兴通讯股份有限公司 功率比确定方法及装置
CN110891306B (zh) * 2018-09-07 2023-02-28 成都鼎桥通信技术有限公司 下行覆盖自适应调整的方法、基站和存储介质
WO2020237612A1 (en) * 2019-05-31 2020-12-03 Qualcomm Incorporated Csi report configuration for full-duplex communications
CN113115320B (zh) * 2020-01-09 2021-11-30 大唐移动通信设备有限公司 一种频谱资源共享方法及其装置
US11632751B2 (en) 2020-01-31 2023-04-18 Qualcomm Incorporated Determining an energy per resource element for a symbol including a cell-specific reference signal

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006082637A (ja) 2004-09-15 2006-03-30 Toyota Motor Corp 車両用サスペンション装置
JP2006203274A (ja) 2005-01-17 2006-08-03 Ntt Docomo Inc 通信システム、基地局、無線制御装置及び送信電力制御方法
JP2010086905A (ja) 2008-10-02 2010-04-15 Kurimoto Kasei Kogyo Kk 碍子保護カバー
US20100097937A1 (en) * 2008-10-16 2010-04-22 Interdigital Patent Holdings, Inc. Method and apparatus for wireless transmit/receive unit specific pilot signal transmission and wireless transmit/receive unit specific pilot signal power boosting
CN101801091A (zh) 2010-01-28 2010-08-11 北京邮电大学 一种ofdm/mimo系统中资源分配的方法和装置
CN101888690A (zh) 2009-05-13 2010-11-17 大唐移动通信设备有限公司 一种下行功率控制方法及装置
CN101888692A (zh) 2009-05-13 2010-11-17 大唐移动通信设备有限公司 一种下行功率控制方法及装置
JP2011049744A (ja) 2009-08-26 2011-03-10 Fujitsu Ltd 基地局、通信システムおよび通信方法
US20140286185A1 (en) * 2011-11-29 2014-09-25 Huawei Technologies Co., Ltd. Downlink channel estimation method, system, and mobile terminal

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8260206B2 (en) * 2008-04-16 2012-09-04 Qualcomm Incorporated Methods and apparatus for uplink and downlink inter-cell interference coordination
CN101784116B (zh) * 2009-01-19 2012-07-04 华为技术有限公司 一种探测参考信号资源分配的方法、系统和设备

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006082637A (ja) 2004-09-15 2006-03-30 Toyota Motor Corp 車両用サスペンション装置
JP2006203274A (ja) 2005-01-17 2006-08-03 Ntt Docomo Inc 通信システム、基地局、無線制御装置及び送信電力制御方法
JP2010086905A (ja) 2008-10-02 2010-04-15 Kurimoto Kasei Kogyo Kk 碍子保護カバー
US20100097937A1 (en) * 2008-10-16 2010-04-22 Interdigital Patent Holdings, Inc. Method and apparatus for wireless transmit/receive unit specific pilot signal transmission and wireless transmit/receive unit specific pilot signal power boosting
CN101888690A (zh) 2009-05-13 2010-11-17 大唐移动通信设备有限公司 一种下行功率控制方法及装置
CN101888692A (zh) 2009-05-13 2010-11-17 大唐移动通信设备有限公司 一种下行功率控制方法及装置
JP2011049744A (ja) 2009-08-26 2011-03-10 Fujitsu Ltd 基地局、通信システムおよび通信方法
CN101801091A (zh) 2010-01-28 2010-08-11 北京邮电大学 一种ofdm/mimo系统中资源分配的方法和装置
US20140286185A1 (en) * 2011-11-29 2014-09-25 Huawei Technologies Co., Ltd. Downlink channel estimation method, system, and mobile terminal

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
English Translation of the Written Opinion of the International Search Authority in international application No. PCT/CN2011/081202, mailed on Mar. 15, 2012. (4 pages-see entire document).
International Search Report in international application No. PCT/CN2011/081202, mailed on Mar. 15, 2012. (3 pages-see entire document).
Supplementary European Search Report in European application No. 11868245.9, mailed on Oct. 7, 2014. (4 pages-see entire document).

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170311144A1 (en) * 2014-01-28 2017-10-26 Qualcomm Incorporated Discovery signals and network synchronization signals design in lte
US9985762B2 (en) 2014-01-28 2018-05-29 Qualcomm Incorporated Discovery signals and network synchronization signals design in LTE
US10448236B2 (en) * 2014-01-28 2019-10-15 Qualcomm Incorporated Discovery signals and network synchronization signals design in LTE
US20160094374A1 (en) * 2014-09-26 2016-03-31 Telefonaktiebolaget L M Ericsson (Publ) Discovery signal design
US9935807B2 (en) * 2014-09-26 2018-04-03 Telefonaktiebolaget L M Ericsson (Publ) Discovery signal design

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