Abstract
A technique for receiving and transmitting downlink reference signals is disclosed. When transmitting downlink data demodulation reference signals (DMRS) (or reference signals for downlink data demodulation) by using two or more layers the DMRS of each layer may be multiplexed by using a code division multiplexing method and then transmitted. The DMRS for each of the two or more layers may be used for one user equipment or for two or more user equipments. And downlink control signals for transmitting and receiving such DMRS may be configured to have the same format regardless of a single-user mode (or SU-MIMO mode) or a multi-user mode (or MU-MIMO mode) thereby being used.
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Specification Information
Specification Information
Technologies
Family Information
| All Granted Patents In Patent Family : | ---- |
| All Pending Patents In Patent Family : | ---- |
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| Publication No | Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | Status | National Phase Entries | |||||
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Technologies
Multiple-Input Multiple-Output(MIMO)/Massive MIMO
Product
Use Cases
Wireless communication
Services
Claim
1. In a method of transmitting downlink reference signals using two or more layers from a base station, the method comprising: multiplexing two or more downlink reference signals being transmitted by respectively using two or more layers for downlink data signal demodulation in a pre-determined time-frequency region using a code division multiplexing (CDM) method, and transmitting the multiplexed signals to one or more user equipments in a single-user transmission mode or a multi-user transmission mode; and transmitting downlink control signals to the at least one user equipment, the downlink control signals indicating a downlink transmission method for each of the at least one user equipment, and wherein the downlink control signals have identical formats regardless of whether or not the downlink reference signal transmission for each of the at least one user equipment is performed in the single-user transmission mode or in the multiuser transmission mode.
2. The method of claim 1, wherein, the downlink control signals include control information indicating the layer, in which the downlink reference signal transmission for the specific user equipment is performed, only when the downlink reference signal transmission for a specific user equipment is performed through a specific number of layers, and wherein, when the downlink reference signal transmission for the specific user equipment is not performed through the specific number of layers, the layer in which the downlink reference signal transmission for the specific user equipment is performed is predetermined.
3. The method of claim 1, further comprising: transmitting the downlink data signals to the at least one user equipment in the single-user transmission mode or in the multi-user transmission mode by using the two or more layers, and wherein the downlink data signals and the downlink reference signals are processed with the same precoding procedure, thereby being transmitted to the at least one user equipment .
4. The method of claim 1, wherein the downlink control signals include information on number of layers being assigned to each user equipment and information specifying layers used in each user equipment.
5. The method of claim 1, wherein, when the number N of layers being used in the downlink reference signal transmission is greater than M, wherein N corresponds to a number of downlink reference signals that can be multiplexed in the pre-determined time-frequency region by using a code division multiplexing method, each of the N number of downlink reference signals are multiplexed within the pre-determined time-frequency region and additional time-frequency region, and wherein a multiplexing procedure using time division multiplexing (TDN) or frequency division multiplexing (FDM) is performed throughout the pre-determined time-frequency region and additional time-frequency region for each of the N number of downlink reference signals being multiplexed within the predetermined time-frequency region and additional time-frequency region.
6. The method of claim 5, wherein, when two or more user equipments receive the M number of downlink reference signals, the downlink control signal being transmitted to a first user equipment, which receives downlink reference signals transmitted through the pre-determined time-frequency region, includes information indicating that the additional time-frequency region is used for transmitting downlink reference signals to a second user equipment.
7. The method of claim 1, wherein transmission power of each of the two or more downlink reference signals is different from one another, and wherein the downlink control signal further includes transmission power information for the two or more downlink reference signals .
8. In a method of receiving downlink reference signals in a user equipment by using two or more layers from a base station, the method comprising: receiving downlink reference signals multiplexed by using a code division multiplexing (CDM) method in a pre-determined time- frequency region for downlink data signal demodulation from the base station; and receiving downlink control signals indicating a downlink transmission method for the user equipment, and wherein the downlink control signals have identical formats regardless of whether or not the downlink reference signals, which are multiplexed by using a code division multiplexing (ODM) method in a pre-determined time-frequency region, include downlink reference signals that are transmitted to the user equipment as well as another user equipment.
9. The method of claim 8, wherein, the downlink control signals include control information indicating the layer, in which the downlink reference signal transmission for the user equipment is performed, only when the downlink reference signal transmission for the user equipment is performed through a specific number of layers , and wherein, when the downlink reference signal transmission for the user equipment is not performed through the specific number of layers, the layer in which the downlink reference signal transmission for the user equipment is performed is predetermined
10. The method of claim 8, further comprising: receiving the downlink data signals from the base station, and wherein the downlink data signals and the downlink reference signals are processed with the same precoding procedure, thereby being transmitted to the user equipment from the base station
11. The method of claim 8, wherein the downlink reference signals include information on number of layers being assigned to each user equipment and information specifying layers used in each user equipment
12. In a base station transmitting downlink reference signals by using two or more layers, the base station comprising: a processor providing downlink reference signals, which are multiplexed by using a code division multiplexing (CDM) method in a pre-determined time-frequency region, wherein two or more downlink reference signals are to be respectively transmitted by using the two or more layers for downlink data signal demodulation, and downlink control signals indicating a downlink transmission method for each of one or more user equipments ; and a transmitting module transmitting the two or more downlink reference signals and the downlink control signals received from the processor to one or more user equipments in a single-user transmission mode or in a multi-user transmission mode, and wherein the processor provides the downlink control signals in identical formats regardless of whether the single-user transmission mode or the multi-user transmission mode is being applied
13. The base station of claim 12 , wherein the transmitting module additionally transmits downlink data signals to the one or more user equipments in the single-user transmission mode or in the multi-user transmission mode, and wherein the downlink data signals and the downlink reference signals are processed with the same precoding procedure so as to be transmitted to the one or more user equipment
14. The base station of claim 12 , wherein the downlink control signals include information on number of layers being assigned to each user equipment and information specifying layers used in each user equipment
15. In a user equipment receiving downlink reference signals being transmitted from a base station by using two or more layers, the user equipment comprising: a receiving module receiving downlink reference signals multiplexed by using a code division multiplexing (CDM) method in a pre-determined time-frequency region for downlink data signal demodulation from the base station, and receiving downlink control signals indicating a downlink transmission method for the user equipment; and a processor processing the downlink reference signals in accordance with information on the downlink control signals, and wherein the downlink control signals have identical formats regardless of whether or not the downlink reference signals, which are multiplexed by using a code division multiplexing (CDM) method in a pre-determined time-frequency region, include downlink reference signals that are transmitted to the user equipment as well as another user equipment .16. The user equipment of claim 15, wherein the receiving module further receives the downlink data signals from the base station, and wherein the downlink data signals and the downlink reference signals are processed with the same precoding procedure so as to be transmitted to the user equipment from the base station.17. The user equipment of claim 15, wherein the downlink control signals include information on number of layers being assigned to each user equipment and information specifying layers used in each user equipment.']
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SUMMARY
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Patent number:WO2010090442A2
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.