CN103905141B - A kind of channel estimation methods of Physical Downlink Shared Channel, system and equipment - Google Patents
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Abstract
The invention discloses a kind of channel estimation methods of Physical Downlink Shared Channel, precoding granularity of the base station to user equipment (UE) notice Physical Downlink Shared Channel PDSCH；And precoding processing is carried out to the PDSCH of the UE according to the precoding granularity；The UE, according to the precoding granularity of the PDSCH of base station notice, carries out channel estimation when receiving the data of PDSCH carryings；The present invention also discloses a kind of channel estimation system of Physical Downlink Shared Channel and equipment, scheme through the invention, it can solve the problems, such as that precoding granularity is indefinite between UE and base station in communication system, precoding granularities of the UE based on specific PDSCH is set to carry out channel estimation, overhead is reduced, system performance is improved.
Description
Technical Field
The present invention relates to channel estimation techniques for wireless communications, and in particular, to a method, a system, and a device for channel estimation of a physical downlink shared channel.
Background
The Beamforming (BF) technology is a key Multiple Input Multiple Output (MIMO) technology supported by a time division duplex Long Term Evolution (TDD-LTE) system. In the TDD-LTE system, a base station obtains a Downlink Channel matrix based on T Channel reciprocity, calculates to obtain a Downlink precoding matrix, and performs precoding processing on a Physical Downlink Shared Channel (PDSCH). A Demodulation Reference signal (DMRS) and a PDSCH are precoded together, and when a User Equipment (UE) receives the PDSCH, it is necessary to perform channel estimation on the DMRS first and then perform coherent Demodulation on the PDSCH. The accuracy of DMRS channel estimation is an important factor that restricts PDSCH reception performance.
It is specified in LTE R10 release that if a base station configures a UE to feed back a Precoding Matrix Indicator (PMI)/Rank Indicator (RI), the UE may assume a Precoding granularity of the base station as a Precoding Resource Block Group (PRG). However, for the TDD system, it is generally configured to obtain a precoding matrix based on channel reciprocity, and it is not necessary to adopt PMI/RI fed back by the UE, and if the feedback PMI/RI is not configured in the TDD mode, the UE can only assume that the precoding granularity of the base station is RB, DMRS channel estimation cannot perform RB interpolation processing, and channel estimation performance is degraded; if the UE is configured without constraint to feed back PMI/RI, unnecessary feedback overhead will be incurred, and system performance will also be degraded.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method, a system, and a device for channel estimation of a physical downlink shared channel, so that a UE can perform channel estimation based on a clear precoding granularity of a PDSCH.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a channel estimation method of a physical downlink shared channel, which comprises the following steps:
the base station informs the UE of the precoding granularity of the PDSCH; precoding the PDSCH of the UE according to the precoding granularity; and when receiving the data carried by the PDSCH, the UE carries out channel estimation according to the precoding granularity of the PDSCH notified by the base station.
In the above scheme, the base station notifies the UE that the precoding granularity of the PDSCH is: and the base station informs the UE of the precoding granularity of the PDSCH in an explicit informing mode or an implicit informing mode.
In the above scheme, the notifying the UE of the precoding granularity of the PDSCH in the explicit notification manner is: the base station informs the UE of the precoding granularity of the PDSCH through a downlink control signaling;
the method for informing the UE of the precoding granularity of the PDSCH by adopting the implicit informing mode comprises the following steps: and the base station configures the UE to feed back a precoding matrix indicator PMI/rank indicator RI for representing the precoding granularity of the PDSCH.
In the above scheme, the method further comprises: when the base station does not notify the UE of the precoding granularity of the PDSCH, the precoding granularity adopted by the base station and the UE is the default precoding granularity of the base station and the UE.
In the above scheme, the method further comprises: the base station informs the UE of adopting a new precoding granularity again based on the channel change; or,
and the base station informs the UE of adopting the new precoding granularity again based on the operation complexity.
In the above scheme, the re-notifying the UE to adopt the new precoding granularity is: and informing the UE of the new precoding granularity by adopting an explicit informing mode or an implicit informing mode.
The invention provides a channel estimation system of a physical downlink shared channel, which comprises: a base station and a UE; wherein,
the base station is used for informing the UE of the precoding granularity of the PDSCH; precoding the PDSCH of the UE according to the precoding granularity;
and the UE is used for carrying out channel estimation according to the precoding granularity of the PDSCH informed by the base station when receiving the data carried by the PDSCH.
In the foregoing solution, the base station includes: a notification module and a processing module; wherein,
the notification module is configured to notify the UE of the precoding granularity of the PDSCH;
the processing module is configured to perform precoding processing on the PDSCH of the UE according to the precoding granularity;
the UE includes: a receiving module and a channel estimation module; wherein,
the receiving module is configured to receive data carried by the PDSCH;
and the channel estimation module is used for carrying out channel estimation according to the precoding granularity of the PDSCH informed by the base station.
In the foregoing solution, the notifying module is specifically configured to notify the UE of the precoding granularity of the PDSCH in an explicit notification manner or an implicit notification manner;
the channel estimation module is specifically configured to determine a precoding granularity of the PDSCH according to an explicit notification manner or an implicit notification manner adopted by the base station, and perform frequency domain processing of channel estimation according to the determined precoding granularity.
The invention provides a base station, which comprises: a notification module and a processing module; wherein,
the notification module is configured to notify the UE of the precoding granularity of the PDSCH;
and the processing module is used for carrying out precoding processing on the PDSCH of the UE according to the precoding granularity.
In the foregoing scheme, the notifying module is specifically configured to notify the UE of the precoding granularity of the PDSCH in an explicit notification manner or an implicit notification manner.
The invention provides a UE, which comprises: a receiving module and a channel estimation module; wherein,
the receiving module is configured to receive data carried by the PDSCH;
and the channel estimation module is used for carrying out channel estimation according to the precoding granularity of the PDSCH informed by the base station.
In the foregoing solution, the channel estimation module is specifically configured to determine a precoding granularity of the PDSCH according to an explicit notification manner or an implicit notification manner adopted by the base station, and perform frequency domain processing of channel estimation according to the determined precoding granularity.
The invention provides a channel estimation method, a system and equipment of a physical downlink shared channel.A base station informs UE of the precoding granularity of a PDSCH; precoding the PDSCH of the UE according to the precoding granularity; when the UE receives data carried by the PDSCH, channel estimation is carried out according to the precoding granularity of the PDSCH informed by the base station; therefore, the problem that the precoding granularity between the UE and the base station is not clear in the communication system can be solved, the UE can carry out channel estimation based on the clear precoding granularity of the PDSCH, the system overhead is reduced, and the system performance is improved.
Drawings
Fig. 1 is a schematic flow chart of a channel estimation method of a physical downlink shared channel according to the present invention;
fig. 2 is a schematic structural diagram of a channel estimation system of a physical downlink shared channel provided in the present invention.
Detailed Description
The basic idea of the invention is: the base station informs the UE of the precoding granularity of the PDSCH; precoding the PDSCH of the UE according to the precoding granularity; and when receiving the data carried by the PDSCH, the UE carries out channel estimation according to the precoding granularity of the PDSCH notified by the base station.
The invention is further described in detail below with reference to the figures and the specific embodiments.
The invention realizes a channel estimation method of a physical downlink shared channel, as shown in figure 1, the method comprises the following steps:
step 101: the base station informs the UE of the precoding granularity of the PDSCH;
specifically, the base station notifies the UE of the precoding granularity of the PDSCH in an explicit notification manner or an implicit notification manner;
the method for informing the UE of the precoding granularity of the PDSCH by adopting the explicit informing mode comprises the following steps: the base station informs the UE of the precoding granularity of the PDSCH through a downlink control signaling;
the downlink control signaling can directly carry the size of the precoding granularity; or, a list of precoding granularity is set in advance on the base station and the UE, and the downlink control signaling may carry an index corresponding to the precoding granularity in the list; or, the downlink control signaling may not carry the size of the precoding granularity or the corresponding index, so that the size of the default precoding granularity set in the base station and the UE is used;
the size of the precoding granularity may be determined based on channel conditions and/or computational complexity between the UE and the base station;
the downlink control signaling is generally RRC signaling;
the method for informing the UE of the precoding granularity of the PDSCH by adopting the implicit informing mode comprises the following steps: the base station configures UE feedback PMI/RI for representing precoding granularity of PDSCH, such as: indicating that the precoding granularity of the PDSCH is PRG or integral multiple of PRG; or, the precoding granularity of the PDSCH is RB or an integer multiple of RB;
the configuring UE feedback PMI/RI may be configuring UE periodic feedback PMI/RI, where the period may be set to be long, for example: the period is a change period larger than the small scale of the channel; or, the UE may be configured to feedback the PMI/RI aperiodically, such as feeding back the PMI/RI once, feeding back the PMI/RI twice, and the like;
here, the PMI/RI fed back by the UE is not a downlink precoding matrix of the base station, but only implicitly indicates a precoding granularity.
The method also comprises the following steps: the base station notifies the UE to adopt the new precoding granularity again based on the channel change, which may specifically be: when the base station detects that the spatial characteristics of the channel frequency domain become flatter, the base station informs the UE of adopting a larger pre-coding granularity again; when the base station detects that the spatial characteristics of the channel frequency domain become more uneven, the base station informs the UE of adopting a smaller precoding granularity again, wherein the larger and smaller are relative to the precoding granularity adopted by the current base station and the UE;
the method also comprises the following steps: the base station notifies the UE to adopt a new precoding granularity again based on the operation complexity, which may specifically be: when the base station needs to reduce the operation complexity, the base station informs the UE of adopting a larger pre-coding granularity again; when the base station needs to increase the operation complexity, the base station informs the UE of adopting a smaller precoding granularity again, wherein the larger and smaller precoding granularity are relative to the precoding granularity adopted by the current base station and the UE;
the re-informing UE of adopting the new precoding granularity is: informing the UE of the new precoding granularity by adopting an explicit informing mode or an implicit informing mode;
the method for informing the UE of the new precoding granularity by adopting the explicit informing mode comprises the following steps: carrying new pre-coding granularity through a downlink control signaling;
the method for informing the UE of the new precoding granularity by adopting the implicit informing mode comprises the following steps: when the UE is configured to periodically feed back the PMI/RI, the base station indicates the precoding granularity of the UE to be changed into a new precoding granularity different from the current precoding granularity by informing the UE to stop periodically feeding back the PMI/RI; when the UE is configured to non-periodically feed back the PMI/RI, the base station indicates the precoding granularity to be changed into a new precoding granularity different from the current one by configuring constraint conditions to the UE; the constraint condition may be that a timer is added, and when the UE does not receive the feedback indication of the new PMI/RI within the timing time, the UE indicates that the precoding granularity is changed to a new precoding granularity different from the current precoding granularity;
step 102: the base station carries out precoding processing on the PDSCH of the UE according to the precoding granularity;
step 103: when receiving data carried by the PDSCH, the UE performs channel estimation according to the precoding granularity of the PDSCH notified by the base station;
specifically, when receiving data carried by a PDSCH, a UE determines a precoding granularity of the PDSCH according to an explicit notification manner or an implicit notification manner adopted by a base station, and performs frequency domain processing of channel estimation according to the determined precoding granularity;
the method for determining the precoding granularity of the PDSCH according to the explicit notification mode adopted by the base station comprises the following steps: determining the precoding granularity of the PDSCH according to a downlink control signaling sent by a base station;
the method for determining the precoding granularity of the PDSCH according to the implicit notification mode adopted by the base station comprises the following steps: and receiving the configuration of the feedback PMI/RI by the base station, and determining the precoding granularity of the PDSCH.
The method further comprises the following steps: when the base station does not notify the UE of the precoding granularity of the PDSCH, the precoding granularity adopted by the base station and the UE is the default precoding granularity of both sides, for example: RB or integer multiples of RB.
In order to implement the above method, the present invention further provides a channel estimation system of a physical downlink shared channel, as shown in fig. 2, the system includes: base station 21 and UE 22; wherein,
the base station 21, configured to notify UE22 of a precoding granularity of PDSCH; precoding the PDSCH of the UE22 according to the precoding granularity;
the UE22 is configured to perform channel estimation according to the precoding granularity of the PDSCH notified by the base station 21 when receiving data carried by the PDSCH;
the base station 21 includes: a notification module 211 and a processing module 212; wherein,
the notifying module 211 is configured to notify the UE22 of the precoding granularity of the PDSCH;
the processing module 212 is configured to perform precoding processing on the PDSCH of the UE22 according to the precoding granularity;
the notifying module 211 is specifically configured to notify the UE22 of the precoding granularity of the PDSCH in an explicit notification manner or an implicit notification manner;
the notifying module 211 is specifically configured to notify the UE22 of the precoding granularity of the PDSCH through a downlink control signaling;
the downlink control signaling can directly carry the size of the precoding granularity; or, a list of precoding granularity sizes is set in advance on the base station 21 and the UE22, and the downlink control signaling may carry an index corresponding to the precoding granularity size in the list; or, the downlink control signaling may not carry the size of the precoding granularity or the corresponding index, so that the size of the default precoding granularity set in the base station 21 and the UE22 is used;
the notifying module 211 is specifically configured to configure a mode of the UE22 for feeding back the PMI/RI, and is configured to indicate a precoding granularity of the PDSCH;
the notifying module 212 is further configured to notify the UE22 to adopt a new precoding granularity based on the channel change;
the notifying module 212 is further configured to notify the UE22 to adopt a new precoding granularity based on the computation complexity;
the UE22 includes: a receiving module 221 and a channel estimation module 222; wherein,
the receiving module 221 is configured to receive data carried by the PDSCH;
the channel estimation module 222 is configured to perform channel estimation according to the precoding granularity of the PDSCH notified by the base station 21;
the channel estimation module 222 is specifically configured to determine a precoding granularity of the PDSCH according to an explicit notification manner or an implicit notification manner adopted by the base station 21, and perform frequency domain processing of channel estimation according to the determined precoding granularity;
the channel estimation module 222 is specifically configured to determine a precoding granularity of the PDSCH according to a downlink control signaling sent by the base station 21;
the channel estimation module 222 is specifically configured to receive the configuration of the base station 21 for feeding back the PMI/RI, and determine the precoding granularity of the PDSCH.
Based on the above system, the present invention further provides a base station, as shown in fig. 2, where the base station 21 includes: a notification module 211 and a processing module 212; wherein,
the notifying module 211 is configured to notify the UE22 of the precoding granularity of the PDSCH;
the processing module 212 is configured to perform precoding processing on the PDSCH of the UE22 according to the precoding granularity;
the notifying module 211 is specifically configured to notify the UE22 of the precoding granularity of the PDSCH in an explicit notification manner or an implicit notification manner;
the notifying module 211 is specifically configured to notify the UE22 of the precoding granularity of the PDSCH through a downlink control signaling;
the downlink control signaling can directly carry the size of the precoding granularity; or, a list of precoding granularity sizes is set in advance on the base station 21 and the UE22, and the downlink control signaling may carry an index corresponding to the precoding granularity size in the list; or, the downlink control signaling may not carry the size of the precoding granularity or the corresponding index, so that the size of the default precoding granularity set in the base station 21 and the UE22 is used;
the notifying module 211 is specifically configured to configure a mode of the UE22 for feeding back the PMI/RI, and is configured to indicate a precoding granularity of the PDSCH;
the notifying module 212 is further configured to notify the UE22 to adopt a new precoding granularity based on the channel change;
the notifying module 212 is further configured to re-notify the UE22 to adopt a new precoding granularity based on the computation complexity.
Based on the above system, the present invention further provides a UE, as shown in fig. 2, where the UE22 includes: a receiving module 221 and a channel estimation module 222; wherein,
the receiving module 221 is configured to receive data carried by the PDSCH;
the channel estimation module 222 is configured to perform channel estimation according to the precoding granularity of the PDSCH notified by the base station 21;
the channel estimation module 222 is specifically configured to determine a precoding granularity of the PDSCH according to an explicit notification manner or an implicit notification manner adopted by the base station 21, and perform frequency domain processing of channel estimation according to the determined precoding granularity;
the channel estimation module 222 is specifically configured to determine a precoding granularity of the PDSCH according to a downlink control signaling sent by the base station 21;
the channel estimation module 222 is specifically configured to receive the configuration of the base station 21 for feeding back the PMI/RI, and determine the precoding granularity of the PDSCH.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (7)
1. A channel estimation method of a physical downlink shared channel is characterized by comprising the following steps:
a base station informs User Equipment (UE) of the precoding granularity of a Physical Downlink Shared Channel (PDSCH); precoding the PDSCH of the UE according to the precoding granularity; when the UE receives data carried by the PDSCH, channel estimation is carried out according to the precoding granularity of the PDSCH informed by the base station;
the base station notifies the user equipment UE of the precoding granularity of the PDSCH, and the method comprises the following steps: the base station configures UE (user equipment) to feed back precoding matrix indication PMI/RI, which is used for representing the precoding granularity of the PDSCH (physical downlink shared channel);
after the base station configures the UE to feed back the precoding matrix indicator PMI/RI, the method further includes: when the UE is configured to non-periodically feed back the PMI/RI, the base station configures a timer for the UE, and when the UE does not receive the feedback indication of the new PMI/RI within the timing time, the UE indicates that the precoding granularity is changed into a new precoding granularity different from the current precoding granularity.
2. The channel estimation method of claim 1, further comprising: when the base station does not notify the UE of the precoding granularity of the PDSCH, the precoding granularity adopted by the base station and the UE is the default precoding granularity of the base station and the UE.
3. The channel estimation method of claim 1, further comprising: the base station informs the UE of adopting a new precoding granularity again based on the channel change; or,
and the base station informs the UE of adopting the new precoding granularity again based on the operation complexity.
4. A channel estimation system for a physical downlink shared channel, the system comprising: a base station and a UE; wherein,
the base station is used for informing the UE of the precoding granularity of the PDSCH; precoding the PDSCH of the UE according to the precoding granularity;
the UE is used for carrying out channel estimation according to the precoding granularity of the PDSCH informed by the base station when receiving the data carried by the PDSCH;
the base station is specifically configured to configure UE feedback PMI/RI, and is configured to indicate precoding granularity of a PDSCH;
the base station is further used for configuring a timer to the UE when the UE is configured to feed back the PMI/RI in an aperiodic way;
the UE is further configured to indicate that the precoding granularity is changed to a new precoding granularity different from the current precoding granularity when the UE does not receive the feedback indication of the new PMI/RI within the timing time.
5. The channel estimation system of claim 4, wherein the base station comprises: a notification module and a processing module; wherein,
the notification module is configured to notify the UE of the precoding granularity of the PDSCH;
the processing module is configured to perform precoding processing on the PDSCH of the UE according to the precoding granularity;
the UE includes: a receiving module and a channel estimation module; wherein,
the receiving module is configured to receive data carried by the PDSCH;
and the channel estimation module is used for carrying out channel estimation according to the precoding granularity of the PDSCH informed by the base station.
6. A base station, comprising: a notification module and a processing module; wherein,
the notification module is configured to notify the UE of the precoding granularity of the PDSCH;
the processing module is configured to perform precoding processing on the PDSCH of the UE according to the precoding granularity;
the notification module is specifically configured to configure a mode in which the UE feeds back the PMI/RI, and is configured to indicate a precoding granularity of the PDSCH;
wherein the informing the UE of the precoding granularity of the PDSCH comprises:
when the UE is configured to non-periodically feed back the PMI/RI, the base station configures a timer to the UE.
7. A UE, comprising: a receiving module and a channel estimation module; wherein,
the receiving module is configured to receive data carried by the PDSCH;
the channel estimation module is used for carrying out channel estimation according to the precoding granularity of the PDSCH informed by the base station;
the channel estimation module is used for receiving the configuration of the feedback PMI/RI by the base station and determining the precoding granularity of the PDSCH;
wherein the determining the precoding granularity of the PDSCH comprises:
and when the UE does not receive the feedback indication of the new PMI/RI within the timing time, the UE indicates that the precoding granularity is changed into a new precoding granularity different from the current precoding granularity.
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