WO2012024993A1 - 八天线下行控制信道发送方法及装置 - Google Patents
八天线下行控制信道发送方法及装置 Download PDFInfo
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- WO2012024993A1 WO2012024993A1 PCT/CN2011/077468 CN2011077468W WO2012024993A1 WO 2012024993 A1 WO2012024993 A1 WO 2012024993A1 CN 2011077468 W CN2011077468 W CN 2011077468W WO 2012024993 A1 WO2012024993 A1 WO 2012024993A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/10—Polarisation diversity; Directional diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
- H04B7/0469—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking special antenna structures, e.g. cross polarized antennas into account
Definitions
- the present invention claims the priority of the Chinese patent application filed on August 23, 2010, the Chinese Patent Application No. 201010261177.9, entitled “Eight Antenna Downlink Control Channel Transmission Method and Apparatus", The entire contents of this application are incorporated herein by reference.
- TECHNICAL FIELD The present invention relates to the field of antenna technologies, and in particular, to a method and an apparatus for transmitting an eight-antenna downlink control channel.
- TD-LTE Time Division Duplexing-Long Term Evolution
- FDD Frequency Division Duplexing
- the total power of all the antennas of the TDD base station and the FDD base station is the same, for example, the total power is 40 W, then the power of each of the eight antennas of the TDD base station is 5 W, and the power of each of the two antennas of the FDD base station is 20W.
- the transmission mode of the downlink control channel of the FDD base station is 2x2 Space Frequency Block Coding (SFBC).
- SFBC Space Frequency Block Coding
- the transmission mode of the downlink control channel of the TD-LTE base station can be divided into two categories, and the first type is based on 4-port, for example, SFBC+ Frequency Switched Transmit Diversity (FSTD).
- FSTD Frequency Switched Transmit Diversity
- a non-negligible disadvantage of the 4-port mode is that it requires 4 ports of common demodulation pilot (CRS), and the pilot overhead is too large.
- CRS common demodulation pilot
- the second type is the broadcast right mode.
- Figure 1 shows the existing TD-LTE base station. The schematic diagram of transmitting the downlink control channel by using the broadcast right mode, as shown in FIG.
- the method uses the two-port mode of the FDD base station, that is, the eight antennas are virtualized into two antenna ports by the packet, one of the ports (ie, port 0) It is virtualized by four antennas with +45 degrees, and the other port (ie, port 1) is virtualized by four antennas in the direction of 45 degrees, and then the downlink control channel is transmitted through 2x2 SFBC.
- the broadcast right mode has a certain attractiveness because it uses two ports and its pilot overhead is reduced compared to the 4-port mode. However, in the broadcast right mode, the weighting value on some of the four antennas of the same port is less than 1, so there is power loss, which causes the 2 antenna downlink control channel of the FDD base station that does not reach the same total power. Coverage. SUMMARY OF THE INVENTION
- the present invention provides an 8-antenna downlink control channel transmission method and apparatus for expanding the coverage of a downlink control channel of a base station employing eight antennas.
- a method for transmitting an eight-antenna downlink control channel comprising: For the eight antennas used by the base station for downlink transmission, the first pair and the third pair of dual-polarized antennas are virtualized as the first port, and the second pair and the fourth pair of dual-polarized antennas are virtualized as the second port;
- the broadcast weighting value of the four antennas of the first port satisfies: one of the antennas has a weighting value of +1, and the other three antennas have a weighting value of -1; or one of the antennas has a weighting value of -1.
- the other three antennas have a weighted value of + 1;
- the broadcast weighting values of the four antennas of the second port are satisfied: one of the antennas has a weighting value of + 1, and the other three antennas have a weighting value of -1, or one of the antennas has a weighting value of -1, and the other three
- the weight of the antenna is + 1; the base station sends a downlink control signal through the first port and the second port.
- the base station is a Long Term Evolution LTE time division duplex TDD base station, or an LTE A TDD base station, or an LTE frequency division duplex FDD base station, or an LTE AFDD base station.
- a method for transmitting an eight-antenna downlink control channel comprising:
- the first pair and the fourth pair of dual-polarized antennas are virtualized as the first port, and the second pair and the third pair of dual-polarized antennas are virtualized as the second port;
- the broadcast weighting values of the four antennas of the first port are: one of the antennas has a weighting value of +1, and the other three antennas have a weighting value of -1, or one of the antennas has a weighting value of -1.
- the other three antennas have a weighted value of + 1;
- the broadcast weights of the four antennas of the second port are: The weight of one of the antennas is + 1, and the weight of the three antennas is -1, or the weight of one of the antennas is - 1, and the other three The weight of the antenna is + 1; the base station sends a downlink control signal through the first port and the second port.
- the base station is a Long Term Evolution LTE Time Division Duplex TDD Base Station, or an LTE A TDD Base Station, or an LTE Frequency Division Duplex FDD Base Station, or an LTE A FDD Base Station.
- a method for transmitting an eight-antenna downlink control channel comprising:
- the +45-degree directional antennas of the first and second pairs of dual-polarized antennas and the -45-degree directional antenna of the third and fourth pairs of dual-polarized antennas are virtualized as the first port.
- the broadcast weighting values of the four antennas of the first port are: one of the antennas has a weighting value of +1, and the other three antennas have a weighting value of -1, or one of the antennas has a weighting value of -1.
- the other three antennas have a weighted value of + 1;
- the broadcast weights of the four antennas of the second port are: The weight of one of the antennas is + 1, and the weight of the three antennas is -1, or the weight of one of the antennas is - 1, and the other three The weight of the antenna is + 1; the base station sends a downlink control signal through the first port and the second port.
- the base station is a Long Term Evolution (LTE) time division duplex TDD base station, or an LTE A TDD base station, or an LTE frequency division duplex FDD base station, or an LTE A FDD base station.
- LTE Long Term Evolution
- a method for transmitting an eight-antenna downlink control channel comprising:
- the +45-degree directional antenna in the first and third pairs of dual-polarized antennas and the -45-degree directional antenna in the second and fourth pairs of dual-polarized antennas are virtualized as the first port.
- the broadcast weighting values of the four antennas of the first port are: one of the antennas has a weighting value of +1, and the other three antennas have a weighting value of -1, or one of the antennas has a weighting value of -1.
- the other three antennas have a weighted value of + 1;
- the broadcast weights of the four antennas of the second port are: The weight of one of the antennas is + 1, and the weight of the three antennas is -1, or the weight of one of the antennas is - 1, and the other three The weight of the antenna is + 1; the base station sends a downlink control signal through the first port and the second port.
- the base station is a Long Term Evolution LTE Time Division Duplex TDD Base Station, or an LTE A TDD Base Station, or an LTE Frequency Division Duplex FDD Base Station, or an LTE A FDD Base Station.
- a method for transmitting an eight-antenna downlink control channel comprising:
- the +45-degree directional antenna of the 1st, 4th pair of dual-polarized antennas and the _45-degree directional antenna of the 2nd, 3rd pair of dual-polarized antennas are virtualized as the first port.
- the broadcast weighting values of the four antennas of the first port are: one of the antennas has a weighting value of +1, and the other three antennas have a weighting value of -1, or one of the antennas has a weighting value of -1.
- the other three antennas have a weighted value of + 1;
- the broadcast weights of the four antennas of the second port are: The weight of one of the antennas is + 1, and the weight of the three antennas is -1, or the weight of one of the antennas is - 1, and the other three The weight of the antenna is + 1; the base station sends a downlink control signal through the first port and the second port.
- the base station is a Long Term Evolution LTE Time Division Duplex TDD Base Station, or an LTE A TDD Base Station, or an LTE Frequency Division Duplex FDD Base Station, or an LTE A FDD Base Station.
- a method for transmitting an eight-antenna downlink control channel comprising:
- the +45-degree directional antenna of the first, second, third, and fourth pairs of dual-polarized antennas is virtualized as the first port, and the first, second, third, and fourth pairs of bipolar
- the -45 degree directional antenna in the antenna is virtualized as the second end;
- the broadcast weighting values of the four antennas of the first port are: one of the antennas has a weighting value of +1, and the other three antennas have a weighting value of -1, or one of the antennas has a weighting value of -1.
- the other three antennas have a weighted value of + 1;
- the broadcast weights of the four antennas of the second port are: The weight of one of the antennas is + 1, and the weight of the three antennas is -1, or the weight of one of the antennas is - 1, and the other three The weight of the antenna is + 1;
- the base station sends a downlink control signal through the first port and the second port.
- the base station is a Long Term Evolution LTE Time Division Duplex TDD Base Station, or an LTE A TDD Base Station, or an LTE Frequency Division Duplex FDD Base Station, or an LTE A FDD Base Station.
- An eight-antenna downlink control channel transmitting apparatus comprising:
- Port grouping module For the 8 antennas used by the base station for downlink transmission, the first pair and the third pair of dual-polarized antennas are virtualized as the first port, and the second pair and the fourth pair of dual-polarized antennas are virtualized as the second port.
- the weighting value of the broadcast right of the 4th antenna of the first port satisfies: the weighting value of one antenna is +1, and the weighting value of the other three antennas is _1; or, the weighting value of one antenna is _ 1 .
- the weight of the other three antennas is + 1; the weight of the broadcast weight of the four antennas of the second port satisfies: the weight of one antenna is + 1 , and the weight of the other three antennas is _ 1 , or The weight of one antenna is -1, and the weight of the other three antennas is +1;
- the downlink control signal sending module the first port and the second port obtained by the port grouping module send a downlink control signal.
- the device is located on a Long Term Evolution LTE time division duplex TDD base station, or on an LTE A TDD base station, or on an LTE frequency division duplex FDD base station, or on an LTE A FDD base station.
- An eight-antenna downlink control channel transmitting apparatus includes:
- Port grouping module For the 8 antennas used by the base station for downlink transmission, the first pair and the fourth pair of dual-polarized antennas are virtualized as the first port, and the second pair and the third pair of dual-polarized antennas are virtualized as the second port.
- the weighting value of the broadcast weight of the antenna of the first port is: one of the antennas has a weighting value of +1, and the other three antennas have a weighting value of -1, or one of the antennas has a weighting value of - 1 .
- the weight of the other three antennas is + 1; the weight of the broadcast weights of the four antennas of the second port is: the weight of one antenna is + 1 , and the weight of the other three antennas is _ 1 , or The weight of one antenna is -1, and the weight of the other three antennas is +1;
- the downlink control signal sending module the first port and the second port obtained by the port grouping module send a downlink control signal.
- the device is located on a Long Term Evolution LTE time division duplex TDD base station, or on an LTE A TDD base station, or on an LTE frequency division duplex FDD base station, or on an LTE A FDD base station.
- An eight-antenna downlink control channel transmitting apparatus includes:
- Port grouping module For the 8 antennas used by the base station for downlink transmission, the +45 degree directional antenna in the first and second pairs of dual-polarized antennas and the -45-degree directional antenna in the third and fourth pairs of dual-polarized antennas are virtualized.
- the first port virtualize the _45-degree directional antenna in the first and second pairs of dual-polarized antennas and the +45-degree directional antenna in the third and fourth pairs of dual-polarized antennas as the second port; wherein, the first port
- the weighting values of the broadcast weights of the four antennas are: one of the antennas has a weighting value of +1, and the other three antennas have a weighting value of -1, or one of the antennas has a weighting value of -1, and the other three antennas are weighted.
- the value of the broadcast weight of the four antennas of the second port is: the weight of one antenna is + 1 , and the weight of the other three antennas is -1, or the weight of one antenna is - 1 , the weight of the other three antennas is + 1;
- the downlink control signal sending module the first port and the second port obtained by the port grouping module send a downlink control signal.
- the device is located on a Long Term Evolution LTE time division duplex TDD base station, or on an LTE A TDD base station, or on an LTE frequency division duplex FDD base station, or on an LTE A FDD base station.
- a method for transmitting an eight-antenna downlink control channel comprising:
- Port grouping module For the 8 antennas used by the base station for downlink transmission, the +45-degree directional antenna in the first and third pairs of dual-polarized antennas and the -45-degree directional antenna in the second and fourth pairs of dual-polarized antennas are virtualized.
- the _45-degree directional antenna in the first and third pairs of dual-polarized antennas and the +45-degree directional antenna in the second and fourth pairs of dual-polarized antennas are virtualized as the second port; wherein, the first port
- the weighting values of the broadcast weights of the four antennas are: one of the antennas has a weighting value of +1, and the other three antennas have a weighting value of -1, or one of the antennas has a weighting value of -1, and the other three antennas are weighted.
- the value of the broadcast weight of the four antennas of the second port is: the weight of one antenna is + 1 , and the weight of the other three antennas is -1, or the weight of one antenna is - 1 , the weight of the other three antennas is + 1;
- the downlink control signal sending module the first port and the second port obtained by the port grouping module send a downlink control signal.
- the device is located on a Long Term Evolution LTE time division duplex TDD base station, or on an LTE A TDD base station, or on an LTE frequency division duplex FDD base station, or on an LTE A FDD base station.
- a method for transmitting an eight-antenna downlink control channel comprising:
- Port grouping module For the 8 antennas used by the base station for downlink transmission, the + and 4 pairs of dual-polarized antennas are +
- the 45-degree directional antenna and the -45-degree directional antenna in the 2nd and 3rd pairs of dual-polarized antennas are virtualized as the first port, and the _45-degree directional antenna and the second and third pairs in the first and fourth pairs of dual-polarized antennas
- the +45 degree directional antenna in the dual-polarized antenna is virtualized as the second port; wherein the broadcast weights of the four antennas of the first port are: The weighting value of one antenna is + 1 , and the weight of the other three antennas The value of -1, or one of the antennas is -1, and the weight of the other three antennas is +1; the weighting of the broadcast weights of the four antennas of the second port is: 1 , the other three antennas have a weight of -1, or one of the antennas has a weight of -1, and the other three antennas have a weight of +1;
- the downlink control signal sending module the first port and the second port obtained by the port grouping module send a downlink control signal.
- the device is located on a Long Term Evolution LTE time division duplex TDD base station, or on an LTE ATDD base station, or on an LTE frequency division duplex FDD base station, or on an LTE A FDD base station.
- An eight-antenna downlink control channel transmitting apparatus comprising:
- Port grouping module For the 8 antennas used by the base station for downlink transmission, the 1st, 2nd, 3rd, and 4th pairs of dual-polarized antennas
- the +45 degree directional antenna is virtualized as the first port, and the -45 degree directional antenna in the pair 1, 2, 3, and 4 pairs of dual-polarized antennas is virtualized as the second port; wherein, the first antenna of the four antennas
- the weighting value of the broadcast right is: the weight of one antenna is + 1 , and the weight of the other three antennas is _ 1 , or the weight of one antenna is -1 , and the weight of the other three antennas is + 1;
- the broadcast weighting values of the four antennas of the second port are: one of the antennas has a weighted value of +1, and the other three antennas have a weighting value of _1, or one of the antennas has a weighting value of _1, and the other three The weight of the antenna is + 1;
- the downlink control signal sending module sends the downlink control signal through the first port and the second port.
- the device is located on a Long Term Evolution LTE time division duplex TDD base station, or on an LTE A TDD base station, or on an LTE frequency division duplex FDD base station, or on an LTE A FDD base station.
- FIG. 1 is a schematic diagram of a conventional TD-LTE base station transmitting a downlink control channel by using a broadcast right mode
- FIG. 2 is a flow chart showing a method for transmitting a downlink control channel of a base station using an 8-antenna according to Embodiment 1 of the present invention
- FIG. 3 is a schematic diagram of a manner of transmitting a downlink control channel of a base station with 8 antennas according to Embodiment 1 of the present invention
- FIG. 4 is a flow chart of a method for transmitting a downlink control channel of a base station using eight antennas according to Embodiment 2 of the present invention
- FIG. 5 is a schematic diagram of a manner of transmitting a downlink control channel of a base station using eight antennas according to Embodiment 2 of the present invention
- FIG. 6 is a flow chart of a method for transmitting a downlink control channel of a base station using eight antennas according to Embodiment 3 of the present invention
- FIG. 7 is a schematic diagram of a manner of transmitting a downlink control channel of a base station using eight antennas according to Embodiment 3 of the present invention.
- FIG. 8 is a flowchart of a method for transmitting a downlink control channel of a base station with 8 antennas according to Embodiment 4 of the present invention
- FIG. 9 is a schematic diagram of a manner of transmitting a downlink control channel of a base station with 8 antennas according to Embodiment 4 of the present invention
- FIG. 8 is a flowchart of a method for transmitting a downlink control channel of a base station with 8 antennas according to Embodiment 4 of the present invention
- FIG. 9 is a schematic diagram of a manner of transmitting a downlink control channel of a base station with 8 antennas according to Embodiment 4 of the present invention
- FIG. 8 is a flowchart of a method for transmitting a downlink control channel of a base station with 8 antennas according to Embodiment 4 of the present invention
- FIG. 9 is a schematic diagram of a manner of transmitting a downlink control channel of a base station with 8 antennas according to Embodiment
- FIG. 10 is a flowchart of a method for transmitting a downlink control channel of a base station using eight antennas according to Embodiment 5 of the present invention
- FIG. 11 is a schematic diagram of a manner of transmitting a downlink control channel of a base station using eight antennas according to Embodiment 5 of the present invention.
- FIG. 12 is a flowchart of a method for transmitting a downlink control channel of a base station using eight antennas according to Embodiment 6 of the present invention.
- FIG. 13 is a schematic diagram of a manner of transmitting a downlink control channel of a base station using eight antennas according to Embodiment 6 of the present invention.
- FIG. 14 is a schematic diagram of a configuration of an apparatus for transmitting an 8-antenna downlink control channel according to Embodiment 1 of the present invention
- FIG. 15 is a comparison diagram of simulation results of an existing broadcast right scheme according to Embodiments 1 to 6 of the present invention. DETAILED DESCRIPTION OF THE INVENTION The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
- FIG. 2 is a flowchart of a method for transmitting a downlink control channel of a base station with 8 antennas according to Embodiment 1 of the present invention. As shown in FIG. 2, the specific steps are as follows:
- Step 201 For the 8 antennas used by the base station for downlink transmission, the first pair and the third pair of dual-polarized antennas are virtualized as port 0, and the second pair and the fourth pair of dual-polarized antennas are virtualized as port 1.
- the broadcast weighting values of the four antennas of port 0 are: one of the antennas has a weighting value of +1, and the other three antennas have a weighting value of _1, or one of the antennas has a weighting value of -1.
- the weight of the three antennas is + 1; the weight of the broadcast weights of the four antennas of port 1 is: the weight of one antenna is + 1 , and the weight of the other three antennas is -1 , or one of the antennas
- the weighting value is _ 1 and the weight of the other three antennas is + 1.
- FIG. 3 is a schematic diagram showing a manner of transmitting a downlink control channel of a base station using eight antennas according to Embodiment 1 of the present invention.
- Step 202 The base station sends a downlink control signal through port 0 and port 1.
- FIG. 4 is a flowchart of a method for transmitting a downlink control channel of a base station with eight antennas according to Embodiment 2 of the present invention. As shown in FIG. 4, the specific steps are as follows:
- Step 401 For the 8 antennas used by the base station for downlink transmission, the first pair and the fourth pair of dual-polarized antennas are virtualized as port 0, and the second pair and the third pair of dual-polarized antennas are virtualized as port 1.
- the weighting value of the broadcast weight of the 4 antennas of port 0 is: one of the antennas has a weighted value of +1, and the other three antennas have a weighting value of _1, or one of the antennas has a weighting value of -1.
- the weighting values of the other three antennas are + 1; the weighting values of the broadcast weights of the four antennas of port 1 are: the weighting value of one antenna is + 1 , and the weighting value of the other three antennas is -1 , or one of the antennas Weighting The value is _ 1 and the weight of the other three antennas is + 1.
- FIG. 5 is a schematic diagram showing a manner of transmitting a downlink control channel of a base station using eight antennas according to Embodiment 2 of the present invention.
- Step 402 The base station sends a downlink control signal through port 0 and port 1.
- FIG. 6 is a flowchart of a method for transmitting a downlink control channel of a base station using eight antennas according to Embodiment 3 of the present invention. As shown in FIG. 6, the specific steps are as follows:
- Step 601 For the eight antennas used by the base station for downlink transmission, the +45 degree directional antennas of the first and second pairs of dual polarized antennas and the _45 degree directional antennas of the third and fourth pairs of dual polarized antennas are virtualized as Port 0, virtualizes the _45-degree directional antenna in the first and second pairs of dual-polarized antennas and the +45-degree directional antenna in the third and fourth pairs of dual-polarized antennas as port 1.
- the broadcast weighting values of the four antennas of port 0 are: one of the antennas has a weighting value of +1, and the other three antennas have a weighting value of -1, or one of the antennas has a weighting value of _1.
- the weight of the three antennas is + 1; the weight of the broadcast weights of the four antennas of port 1 is: the weight of one antenna is + 1 , and the weight of the other three antennas is _ 1 , or one of the antennas
- the weighting value is -1 and the weighting of the other three antennas is +1.
- FIG. 7 is a schematic diagram showing a manner of transmitting a downlink control channel of a base station using eight antennas according to Embodiment 3 of the present invention.
- Step 602 The base station sends a downlink control signal by using the port 0 and the second port.
- FIG. 8 is a flowchart of a method for transmitting a downlink control channel of a base station with eight antennas according to Embodiment 4 of the present invention. As shown in FIG. 8, the specific steps are as follows:
- Step 801 For the eight antennas used by the base station for downlink transmission, the +45 degree directional antennas of the first and third pairs of dual polarized antennas and the _45 degree directional antennas of the second and fourth pairs of dual polarized antennas are virtualized as Port 0, virtualizes the _45-degree directional antenna in the first and third pairs of dual-polarized antennas and the +45-degree directional antenna in the second and fourth pairs of dual-polarized antennas as port 1.
- the broadcast weighting values of the four antennas of port 0 are: one of the antennas has a weighting value of +1, and the other three antennas have a weighting value of -1, or one of the antennas has a weighting value of _1.
- the weight of the three antennas is + 1; the weight of the broadcast weights of the four antennas of port 1 is: the weight of one antenna is + 1 , and the weight of the other three antennas is _ 1 , or one of the antennas
- the weighting value is -1 and the weighting of the other three antennas is +1.
- FIG. 9 is a schematic diagram showing a manner of transmitting a downlink control channel of a base station using eight antennas according to Embodiment 4 of the present invention.
- Step 802 The base station sends a downlink control signal by using port 0 and the second port.
- FIG. 10 is a flowchart of a method for transmitting a downlink control channel of a base station using eight antennas according to Embodiment 5 of the present invention. As shown in FIG. 10, the specific steps are as follows:
- Step 1001 For the eight antennas used by the base station for downlink transmission, the +45 degree directional antennas of the first and fourth pairs of dual polarized antennas and the _45 degree directional antennas of the second and third pairs of dual polarized antennas are virtualized as Port 0, virtualizes the _45-degree directional antenna in the first and fourth pairs of dual-polarized antennas and the +45-degree directional antenna in the second and third pairs of dual-polarized antennas as port 1. Its The broadcast weighting values of the four antennas of port 0 are: one of the antennas has a weighting value of +1, and the other three antennas have a weighting value of -1, or one of the antennas has a weighting value of _1.
- the weight of the three antennas is + 1; the weight of the broadcast weights of the four antennas of port 1 is: the weight of one antenna is + 1 , and the weight of the other three antennas is _ 1 , or one of the antennas
- the weighting value is -1 and the weighting of the other three antennas is +1.
- FIG. 11 is a schematic diagram showing a manner of transmitting a downlink control channel of a base station using eight antennas according to Embodiment 5 of the present invention.
- Step 1002 The base station sends a downlink control signal by using port 0 and the second port.
- FIG. 12 is a flowchart of a method for transmitting a downlink control channel of a base station using eight antennas according to Embodiment 6 of the present invention. As shown in FIG. 12, the specific steps are as follows:
- Step 1201 For the 8 antennas used by the base station for downlink transmission, the first, 2, 3, and 4 pairs of dual-polarized antennas
- the +45 degree directional antenna is virtual port 0, and the -45 degree directional antenna in the pair 1, 2, 3, and 4 pairs of dual-polarized antennas is virtualized as port 1.
- the broadcast weighting values of the four antennas of port 0 are: one of the antennas has a weighting value of +1, and the other three antennas have a weighting value of -1, or one of the antennas has a weighting value of -1.
- the weight of the three antennas is + 1;
- the weight of the broadcast weights of the four antennas of port 1 is: the weight of one antenna is + 1 , and the weight of the other three antennas is -1, or one of the antennas
- the weighting value is -1 and the weighting of the other three antennas is +1.
- FIG. 13 is a schematic diagram showing a manner of transmitting a downlink control channel of a base station using eight antennas according to Embodiment 6 of the present invention.
- Step 1202 The base station sends a downlink control signal by using port 0 and the second port.
- the weighting values of the four antennas of the two ports may be the same or different.
- the weight of the four antennas of port 1 can be the same as or different from the weight of the four antennas of port 0.
- the base station in the first to sixth embodiments of the present invention may be an LTE TDD base station or an LTE ATDD base station or an LTE FDD base station or an LTE A FDD base station.
- FIG. 14 is a schematic structural diagram of an apparatus for transmitting an 8-antenna downlink control channel according to Embodiment 1 of the present invention. As shown in FIG. 14, the method mainly includes: a port grouping module and a downlink control signal sending module, where:
- Port grouping module For the 8 antennas used by the base station for downlink transmission, the first pair and the third pair of dual-polarized antennas are virtualized as the first port, and the second pair and the fourth pair of dual-polarized antennas are virtualized as the second port.
- the weighting value of the broadcast right of the 4th antenna of the first port satisfies: the weighting value of one antenna is +1, and the weighting value of the other three antennas is _1; or, the weighting value of one antenna is _ 1 .
- the weight of the other three antennas is + 1; the weight of the broadcast weight of the four antennas of the second port satisfies: the weight of one antenna is + 1 , and the weight of the other three antennas is _ 1 , or The weight of one antenna is -1, and the weight of the other three antennas is +1.
- the correspondence between each port number and the antenna identifier is recorded, and the broadcast weighting value of each antenna included in each port is recorded.
- the downlink control signal sending module according to the correspondence between each port number recorded by the port grouping module and the antenna identifier And a broadcast weighting value of each antenna included in each port, and sending a downlink control signal through the first port and the second port.
- the device shown in FIG. 14 may be located on an LTE TDD base station, or on an LTE ATDD base station, or on an LTE FDD base station, or on an LTE A FDD base station.
- composition of the eight-antenna downlink control channel sending apparatus provided by the second embodiment of the present invention, which mainly includes: a port grouping module and a downlink control signal sending module, where:
- Port grouping module For the 8 antennas used by the base station for downlink transmission, the first pair and the fourth pair of dual-polarized antennas are virtualized as the first port, and the second pair and the third pair of dual-polarized antennas are virtualized as the second port.
- the weighting value of the broadcast weight of the antenna of the first port is: one of the antennas has a weighting value of +1, and the other three antennas have a weighting value of -1, or one of the antennas has a weighting value of - 1 .
- the weight of the other three antennas is + 1; the weight of the broadcast weights of the four antennas of the second port is: the weight of one antenna is + 1 , and the weight of the other three antennas is _ 1 , or The weight of one antenna is -1, and the weight of the other three antennas is +1.
- the correspondence between each port number and the antenna identifier is recorded, and the broadcast weighting value of each antenna included in each port is recorded.
- the downlink control signal sending module sends the downlink control signal through the first port and the second port according to the correspondence between each port number recorded by the port grouping module and the antenna identifier and the broadcast weighting value of each antenna included in each port.
- the device provided in the second embodiment of the present invention may be located on an LTE TDD base station, or on an LTE ATDD base station, or on an LTE FDD base station, or on an LTE A FDD base station.
- composition of an eight-antenna downlink control channel sending apparatus which mainly includes: a port grouping module and a downlink control signal sending module, where:
- Port grouping module For the 8 antennas used by the base station for downlink transmission, the +45 degree directional antenna in the first and second pairs of dual-polarized antennas and the -45-degree directional antenna in the third and fourth pairs of dual-polarized antennas are virtualized.
- the first port virtualize the _45-degree directional antenna in the first and second pairs of dual-polarized antennas and the +45-degree directional antenna in the third and fourth pairs of dual-polarized antennas as the second port; wherein, the first port
- the weighting values of the broadcast weights of the four antennas are: one of the antennas has a weighting value of +1, and the other three antennas have a weighting value of -1, or one of the antennas has a weighting value of -1, and the other three antennas are weighted.
- the value of the broadcast weight of the four antennas of the second port is: the weight of one antenna is + 1 , and the weight of the other three antennas is -1, or the weight of one antenna is - 1 , the weight of the other three antennas is + 1; record the correspondence between each port number and the antenna identifier, and record the broadcast weighting value of each antenna included in each port.
- the downlink control signal sending module sends the downlink control signal through the first port and the second port according to the correspondence between each port number recorded by the port grouping module and the antenna identifier and the broadcast weighting value of each antenna included in each port.
- the device provided in Embodiment 3 of the present invention may be located on an LTE TDD base station, or on an LTE ATDD base station, or on an LTE FDD base station, or on an LTE A FDD base station.
- Embodiment 4 of the present invention mainly includes: a port grouping module and a downlink control signal sending module, where:
- Port grouping module For the 8 antennas used by the base station for downlink transmission, the + in the 1st and 3rd pairs of dual-polarized antennas The 45-degree directional antenna and the -45-degree directional antenna in the 2nd, 4th pair of dual-polarized antennas are virtualized as the first port, and the _45-degree directional antenna and the second and fourth pairs in the first and third pairs of dual-polarized antennas The +45 degree directional antenna in the dual-polarized antenna is virtualized as the second port; wherein the broadcast weights of the four antennas of the first port are: The weighting value of one antenna is + 1 , and the weight of the other three antennas The value of -1, or one of the antennas is -1, and the weight of the other three antennas is +1; the weighting of the broadcast weights of the four antennas of the second port is: 1 .
- the weight of the other three antennas is -1, or one of the antennas has a weight of -1, and the other three antennas have a weight of +1. Record the correspondence between each port number and the antenna identifier, and record each port. The broadcast weighting value of each antenna included.
- the downlink control signal sending module sends the downlink control signal through the first port and the second port according to the correspondence between each port number recorded by the port grouping module and the antenna identifier and the broadcast weighting value of each antenna included in each port.
- the device provided in Embodiment 4 of the present invention may be located on an LTE TDD base station, or on an LTE ATDD base station, or on an LTE FDD base station, or on an LTE A FDD base station.
- composition of an eight-antenna downlink control channel sending apparatus which mainly includes: a port grouping module and a downlink control signal sending module, where:
- Port grouping module For the 8 antennas used by the base station for downlink transmission, the +45 degree directional antenna in the first and fourth pairs of dual-polarized antennas and the -45-degree directional antenna in the second and third pairs of dual-polarized antennas are virtualized.
- the _45 degree directional antenna in the first and fourth pairs of dual polarized antennas and the +45 directional antenna in the second and third pairs of dual polarized antennas are virtualized as the second port; wherein, the first port
- the weighting values of the broadcast weights of the four antennas are: one of the antennas has a weighting value of +1, and the other three antennas have a weighting value of -1, or one of the antennas has a weighting value of -1, and the other three antennas are weighted.
- the value of the broadcast weight of the four antennas of the second port is: the weight of one antenna is + 1 , and the weight of the other three antennas is -1, or the weight of one antenna is - 1 , the weight of the other three antennas is + 1; record the correspondence between each port number and the antenna identifier, and record the broadcast weighting value of each antenna included in each port.
- the downlink control signal sending module sends the downlink control signal through the first port and the second port according to the correspondence between each port number recorded by the port grouping module and the antenna identifier and the broadcast weighting value of each antenna included in each port.
- the device provided in Embodiment 5 of the present invention may be located on an LTE TDD base station, or on an LTE ATDD base station, or on an LTE FDD base station, or on an LTE A FDD base station.
- Embodiment 6 of the present invention mainly includes: a port grouping module and a downlink control signal sending module, where:
- Port grouping module For the 8 antennas used by the base station for downlink transmission, the +45 degree directional antenna of the pair 1, 2, 3, and 4 pairs of dual-polarized antennas is virtualized as the first port, and the first, second, third, The -45 degree directional antenna in the pair of dual-polarized antennas is virtualized as the second port; wherein, the broadcast weights of the four antennas of the first port are weighted: one of the antennas has a weighting value of +1, and the other three antennas The weighting value is _ 1 , or one of the antennas has a weighting value of -1 , and the other three antennas have a weighting value of + 1; the second antenna has a broadcast weighting value of four antennas: one of the antennas has a weighting value For + 1 , the other three antennas have a weight of _ 1 , or one of the antennas has a weight of _ 1 and the other three antennas The weighted value is + 1 ; the correspondence between each port number and the antenna
- the downlink control signal sending module sends the downlink control signal through the first port and the second port according to the correspondence between each port number recorded by the port grouping module and the antenna identifier and the broadcast weighting value of each antenna included in each port.
- the device provided in Embodiment 6 of the present invention may be located on an LTE TDD base station, or on an LTE ATDD base station, or on an LTE FDD base station, or on an LTE A FDD base station. It has been experimentally proved that the 8-antenna downlink control channel transmission method provided by the present invention can make the performance of the downlink control channel reach or exceed the performance of the 2-antenna downlink control channel of the LTE FDD base station.
- the comparison between the method provided by the six embodiments of the present invention and the existing broadcast right method in the same simulation scenario is given below:
- the simulation conditions are as follows:
- the simulation scenario is a third-generation partner organization 2D Antenna Scene 1 (3GPP Case 1-2D).
- the base station is a TD-LTE base station, and the downlink transmission uses 8 (4 pairs) dual-polarized antennas, and the distance between two adjacent pairs of antennas is 0.5 times wavelength; setting user equipment (UE, User Equipment) Two co-polarized antennas with a spacing of 0.5 times the wavelength of the two antennas.
- UE User Equipment
- the simulation process is as follows:
- the solution includes: six solutions provided in Embodiments 1 to 6 of the present invention and an existing broadcast right scheme, recording that each antenna of each UE is received from each port of the TD-LTE base station, that is, port 0 and port 1, The power level of the downlink control signal. For each scheme, the power of the downlink control signals received by each of the two antennas of each UE in the predetermined time period from the TD-LTE base station, that is, port 0 and port 1, is linearly averaged.
- Figure 15 shows a comparison of simulation results, where the unit of the abscissa is 10 degrees. Since the main lobe of the sector antenna of the TD-LTE base station corresponds to one UE every 10 degrees on both sides, in Figure 15, on the abscissa Each integer point represents a UE, a total of 25 UEs, the closer to the central integer point is closer to the main lobe of the antenna; the ordinate indicates that the two antennas of the UE are received from port 0 of the TD-LTE base station within a predetermined time period.
- Option 0 The existing broadcast rights scheme, that is, port 0 is virtualized by four antennas in the direction of +45 degrees, port 1 is virtualized by four antennas in the direction of 45 degrees, and the broadcasting rights of four antennas of port 0
- the weighted value is [-0.6230-0.0025j, 1.0, 1.0 0.2986-0.0020j ]
- the broadcast weight of the 4 ⁇ antenna of port 1 is also [-0.6230-0.0025j 1.0, 1.0, 0.2986-0.0020j]
- the first embodiment of the present invention wherein the weight of the four antennas of the port 0 is [1 -1, 1,1].
- the second embodiment of the present invention wherein the antennas of the port 0 1 are The weighting value is [1 1 1 - 1].
- the weighting value of the four antennas of the port 0 1 is [1 -1, 1 1].
- the weighting value of the four antennas of the port 0 1 is [1 ⁇ , ⁇ , -1].
- the third embodiment of the present invention wherein the weight of the four antennas of the port 0 1 is [1 -1, 1 1
- the fourth embodiment of the present invention wherein the weighting values of the four antennas of the port 0 1 are [1 1 1 - 1].
- the fourth embodiment of the present invention wherein the weighting of the four antennas of the port 0 1 The value is [1 -1 1 1].
- Scenario 51 Embodiment 5 of the present invention, wherein the weight of the four antennas of port 0 1 is [1 1 1 - 1].
- Scheme 52 Embodiment 5 of the present invention, wherein the port The weighting value of the four antennas of 0 1 is [1 -1, 1 1].
- Scheme 61 Embodiment 6 of the present invention, wherein the weighting values of the four antennas of port 0 1 are [1 ⁇ , ⁇ , - 1] 62: The invention In the sixth embodiment, the weighting value of the four antennas of the port 0 1 is [1 -1, 1 1].
- the existing broadcast right scheme is in the vicinity of the main lobe of the sector antenna of the TD-LTE base station.
- the downlink control performance of the present invention is superior to the existing broadcast rights scheme.
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Abstract
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Priority Applications (3)
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EP11819368.9A EP2611055B1 (en) | 2010-08-23 | 2011-07-22 | Sending method and device for 8-antenna downlink control channel |
US13/814,505 US20130136092A1 (en) | 2010-08-23 | 2011-07-22 | Sending method and device for 8-antenna downlink control channel |
JP2013525121A JP5735647B2 (ja) | 2010-08-23 | 2011-07-22 | 8本のアンテナを使用するダウンリンク制御チャネルの伝送方法と装置 |
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CN201010261177.9A CN102377467B (zh) | 2010-08-23 | 2010-08-23 | 八天线下行控制信道发送方法及装置 |
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EP (1) | EP2611055B1 (zh) |
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CN110380767B (zh) * | 2018-04-13 | 2022-03-25 | 华为技术有限公司 | 一种预编码矩阵确定方法及装置 |
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EP2611055A1 (en) | 2013-07-03 |
EP2611055A4 (en) | 2017-04-19 |
JP5735647B2 (ja) | 2015-06-17 |
CN102377467A (zh) | 2012-03-14 |
CN102377467B (zh) | 2015-02-04 |
EP2611055B1 (en) | 2020-03-18 |
US20130136092A1 (en) | 2013-05-30 |
JP2013541256A (ja) | 2013-11-07 |
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