CN109474993B - Downlink beam indication method, device and base station - Google Patents
Downlink beam indication method, device and base station Download PDFInfo
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- CN109474993B CN109474993B CN201710805368.9A CN201710805368A CN109474993B CN 109474993 B CN109474993 B CN 109474993B CN 201710805368 A CN201710805368 A CN 201710805368A CN 109474993 B CN109474993 B CN 109474993B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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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
Abstract
The invention provides a downlink beam indicating method, a device and a base station. The method comprises the following steps: receiving the capability report of the UE; determining whether the UE has the capacity of multiple receiving beams according to the reported capacity of the UE; when the UE is determined to have the capability of multiple receiving beams, configuring a DCI field with a preset length for indicating which downlink reference signal the DMRS of the PDSCH is positioned in the DCI sent to the UE; when it is determined that the UE does not have the capability of multiple receive beams, a DCI field for indicating which downlink reference signal the DMRS of the PDSCH is quasi co-located with is not configured in the DCI transmitted to the UE. The invention can save the signaling overhead for indicating the PDSCH DMRS and which downlink reference signal are quasi-co-located.
Description
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a downlink beam indication method, apparatus, and base station.
Background
In the recent 3 GPP-related conference, it is supported that DMRS (Demodulation Reference Signal) and other Reference signals are QCL (Quasi-co-location) indicated by DCI (Downlink Control Information). The other Reference signals here refer to Reference signals used for beam measurement, and include SS block (Synchronization Signal block), CSI-RS (Channel State Information Reference Signal), and the like. DMRS is a reference signal for actual data transmission, which means that DMRS uses the same reception beam as a reference signal for beam measurement if it is quasi co-located with other reference signals.
For a UE (User Equipment) with multiple receive beams, N bits are required to indicate which Downlink reference signal and a DMRS of a PDSCH (Physical Downlink Shared Channel) are spatially quasi co-located in DCI, that is, to indicate an optimal receive beam, so as to improve reception performance.
For a UE with a single receive beam, since only one receive beam is used, that is, the optimal receive beam is fixed, the use of N bits to indicate the optimal receive beam may cause a waste of signaling resources.
Disclosure of Invention
The downlink beam indicating method, the device and the base station provided by the invention can save signaling overhead for indicating the DMRS of the PDSCH and which downlink reference signal is quasi-co-located.
In a first aspect, the present invention provides a downlink beam indicating method, including:
receiving the capability report of the UE;
determining whether the UE has the capability of receiving multiple beams or not according to the capability reported by the UE;
when the UE is determined to have the capability of multiple receiving beams, configuring a DCI field with a preset length for indicating which downlink reference signal the DMRS of the PDSCH is positioned in the DCI sent to the UE;
when it is determined that the UE does not have the capability of multiple receive beams, a DCI field for indicating which downlink reference signal the DMRS of the PDSCH is quasi co-located with is not configured in the DCI transmitted to the UE.
Optionally, when it is determined that the UE has a capability of multiple receive beams and the predetermined length has 1 or more candidate values, configuring, in the DCI transmitted to the UE, a DCI field of a predetermined length used to indicate which downlink reference signal the DMRS of the PDSCH is co-located with, in the DCI:
when UE is expected to receive the RRC field which represents the value of the preset length in the RRC signaling, configuring a DCI field which has the length equal to the value and is used for indicating the PDSCH DMRS and which downlink reference signal are quasi-co-located in DCI sent to the UE;
when the UE does not expect to accept the RRC field which represents the value of the preset length in the RRC signaling, a default DCI field length 0 is configured in advance for the UE, if the default length is not adopted, the UE is informed of the DCI length which is not equal to the default length through the RRC, meanwhile, a DCI field which is used for indicating the DMRS of the PDSCH and which downlink reference signal is quasi-co-located is configured in the DCI sent to the UE, the DCI field length adopts the length configured by the RRC, and otherwise, the default length is adopted.
Optionally, when it is determined that the UE does not have the capability of multiple receive beams and the predetermined length has 1 or more candidate values, the not configuring, in the DCI transmitted to the UE, a DCI field for indicating which downlink reference signal the DMRS of the PDSCH is quasi-co-located with includes:
when UE (user equipment) is expected to accept an RRC field which represents the value of the preset length in an RRC signaling, the length of the DCI field is configured to be 0 by the RRC field, and a DCI field which is used for indicating the DMRS of the PDSCH and which downlink reference signal are quasi-co-located is not configured in the DCI sent to the UE;
when the UE does not expect to accept the RRC field indicating the value of the predetermined length in the RRC signaling, the UE is not sent the RRC field, but the default DCI length 0 is adopted, that is, a DCI field indicating the DMRS of the PDSCH and which downlink reference signal are quasi-co-located is not configured in the DCI sent to the UE.
In a second aspect, the present invention provides a downlink beam indication method apparatus, including:
a receiving unit, configured to receive a capability report of a UE;
the determining unit is used for determining whether the UE has the capacity of multiple receiving beams according to the reported capacity of the UE;
a first configuration unit, configured to configure, when the determination unit determines that the UE has a capability of multiple reception beams, a DCI field of a predetermined length, which is used to indicate which downlink reference signal the DMRS of the PDSCH is positioned in quasi-co-located, in DCI transmitted to the UE;
a second configuration unit, configured to, when the determining unit determines that the UE does not have the capability of multiple receive beams, not configure a DCI field indicating which downlink reference signal the DMRS of the PDSCH is quasi co-located with in the DCI transmitted to the UE.
Optionally, when the determining unit determines that the UE has the capability of multiple receive beams and the predetermined length has 1 or more candidate values, the first configuring unit is configured to configure, in DCI sent to the UE, a DCI field with a length equal to the value, where the DCI field is used to indicate that the DMRS of the PDSCH and which downlink reference signal are quasi-co-located, when the UE is expected to receive the RRC field indicating the value of the predetermined length in the radio resource control RRC signaling; and when the UE does not expect to accept the RRC field which represents the value of the preset length in the RRC signaling, a default DCI field length 0 is configured in advance for the UE, if the default length is not adopted, the DCI length which is not equal to the default length is notified to the UE through the RRC, meanwhile, a DCI field which is used for indicating the DMRS of the PDSCH and which downlink reference signal are quasi-co-located is configured in the DCI sent to the UE, the DCI field length adopts the length configured by the RRC, and otherwise, the default length is adopted.
Optionally, when the determining unit determines that the UE does not have a capability of multiple receive beams and the predetermined length has 1 or more candidate values, the second configuring unit is configured to, when the UE is expected to accept an RRC field indicating a value of the predetermined length in an RRC signaling, configure the length of the DCI field to 0 by the RRC field, and not configure a DCI field indicating which downlink reference signal is quasi-co-located with a DMRS of the PDSCH in DCI transmitted to the UE; when the UE does not necessarily expect to accept the RRC field indicating the value of the predetermined length in the RRC signaling, the UE is not sent the RRC field, but the DCI length 0 is used as a default, that is, a DCI field indicating which downlink reference signal is quasi-co-located with the DMRS of the PDSCH is not configured in the DCI sent to the UE.
In a third aspect, the present invention provides a base station, where the base station includes the apparatus for indicating downlink beams.
According to the downlink beam indicating method, the device and the base station provided by the embodiment of the invention, when the UE is determined to have no multi-beam receiving capability according to the capability reported by the UE, a DCI field for indicating the PDSCH DMRS and which downlink reference signal are quasi-co-located is not configured in the DCI sent to the UE. Compared with the prior art, the method and the device do not need to adopt a plurality of bits to indicate the downlink reference signal and the DMRS of the PDSCH as quasi-co-location when the UE does not have the capacity of receiving multiple beams, thereby saving signaling overhead.
Drawings
Fig. 1 is a flowchart of a downlink beam indicating method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a downlink beam indication method apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a downlink beam indication method, as shown in fig. 1, where the method includes:
and S11, the base station reports the capability of receiving the UE.
S12, the base station determines whether the UE has the capability of multiple receiving beams according to the capability reported by the UE.
And S13, when the UE is determined to have the capability of multiple receiving beams, configuring a DCI field with a preset length for indicating the downlink reference signal and the DMRS of the PDSCH as quasi-co-location in the DCI transmitted to the UE.
When a base station determines that a UE has the capability of multiple receiving beams and the predetermined length has 1 or more candidate values, and when the UE certainly expects a Radio Resource Control (RRC) signaling to indicate the length of the DCI field RRC field, the base station firstly informs the UE of the length of the DCI field through the RRC signaling, and configures a DCI field with the length equal to the value and used for indicating that a DMRS of a PDSCH and which downlink reference signal are quasi-co-located in the DCI sent to the UE;
when the base station determines that the UE has the capability of multiple receiving beams and the preset length has 1 or more candidate values, and when the UE does not expect to accept the DCI field, if the DCI length selected by the base station is inconsistent with the default length of 0, the base station firstly informs the UE of the length of the DCI field through RRC, and configures the DCI field with the length equal to the value and used for indicating the PDSCH and which downlink reference signal are quasi-co-located in the DCI sent to the UE, otherwise, the default length of 0 is adopted;
and S14, when the UE is determined not to have the capability of multiple receiving beams, not configuring a DCI field for indicating the PDSCH and which downlink reference signal is quasi-co-located in the DCI transmitted to the UE.
When the base station determines that the UE does not have the capability of multiple receiving beams and the preset length has 1 or more candidate values, and when the UE expects to accept the RRC field which represents the preset length value in the RRC signaling, the RRC field configures the length of the DCI field to be 0, and then the DCI field which is used for indicating that the DMRS of the PDSCH and which downlink reference signal are in quasi-co-location and has the length of 0 is not configured in the DCI sent to the UE;
when the base station determines that the UE does not have the capability of multiple receiving beams and the preset length has 1 or more candidate values, and when the UE does not necessarily expect to accept the RRC field which represents the length of the DCI field in the RRC signaling, the base station does not need to inform the UE through the RRC field in the RRC signaling, and the DCI field which is used for indicating that the DMRS of the PDSCH and the downlink reference signal are quasi-co-located is not configured in the DCI which is sent to the UE by adopting the default length 0.
Further, when the base station determines that the UE does not have the capability of multiple reception beams, the base station side needs to configure the CSI-RS resource retransmission for beam management to be turned off.
According to the downlink beam indicating method provided by the embodiment of the invention, when the UE is determined to have no multi-receiving beam capability according to the capability reported by the UE, a DCI field for indicating the PDSCH and which downlink reference signal are quasi-co-located is not configured in the DCI sent to the UE. Compared with the prior art, the method and the device do not need to adopt a plurality of bits to indicate the DMRS of the PDSCH and which downlink reference signal are quasi-co-located when the UE does not have the capacity of receiving multiple beams, thereby saving signaling overhead.
The following describes the downlink beam indication method according to the embodiment of the present invention in detail with reference to specific examples.
Example 1:
when the predetermined length N for indicating which downlink reference signal is quasi-co-located with the DMRS of the PDSCH has only one candidate value 2, and the UE must expect the RRC field in the RRC signaling for indicating the DCI length, the base station may perform downlink beam indication according to the contents shown in table 1:
TABLE 1
| UE | RRC field | Whether to configure the DCI field | Length of DCI field |
| Single beam reception | 00 | Is not configured | 0 |
| Multi-beam reception | 10 | Configuration of | 2 |
The DCI field refers to an indication field having a length of N bits for indicating that the DMRS and other reference signals are quasi-co-located in the DCI, and is the same as below.
Example 2:
when the predetermined length N for indicating which downlink reference signal the DMRS of the PDSCH is quasi-co-located has three candidate values 1, 2, and 3, and the UE certainly expects the RRC field in the RRC for indicating the DCI length, the base station may perform downlink beam indication according to the contents shown in table 2:
TABLE 2
Example 3:
when the predetermined length N used to indicate which downlink reference signal the DMRS of the PDSCH is co-located with has three candidate values 1, 2, and 3, and the UE does not necessarily expect the RRC field in the RRC for indicating the DCI length, the base station may perform downlink beam indication according to the contents shown in table 3:
TABLE 3
When the predetermined length N for indicating which downlink reference signal is quasi-co-located with the DMRS of the PDSCH has other number of candidate lengths, the embodiments are similar to the above embodiments, and details are not repeated here.
An embodiment of the present invention further provides a downlink beam indication method apparatus, and as shown in fig. 2, the apparatus includes:
a receiving unit 11, configured to receive a capability report of a UE;
a determining unit 12, configured to determine whether the UE has the capability of multiple receiving beams according to the capability reported by the UE;
a first configuration unit 13, configured to configure, when the determination unit 12 determines that the UE has a capability of multiple reception beams, a DCI field of a predetermined length for indicating which downlink reference signal the DMRS of the PDSCH is positioned in, in DCI transmitted to the UE;
a second configuring unit 14, configured to, when the determining unit 12 determines that the UE does not have the capability of multiple receive beams, not configure a DCI field indicating which downlink reference signal the DMRS of the PDSCH is quasi-co-located with in the DCI transmitted to the UE.
Optionally, when the determining unit 12 determines that the UE has a capability of multiple receive beams and the predetermined length has 1 or more candidate values, the first configuring unit 13 is configured to, when the UE is expected to receive an RRC field indicating a value of the predetermined length in an RRC signaling for radio resource control, configure, in DCI transmitted to the UE, a DCI field with a length equal to the value and used for indicating which downlink reference signal is quasi-co-located with a DMRS of a PDSCH; and when the UE does not expect to accept the RRC field which represents the value of the preset length in the RRC signaling, a default DCI field length 0 is configured in advance for the UE, if the default length is not adopted, the DCI length which is not equal to the default length is notified to the UE through the RRC, meanwhile, a DCI field which is used for indicating the DMRS of the PDSCH and which downlink reference signal are quasi-co-located is configured in the DCI sent to the UE, the DCI field length adopts the length configured by the RRC, and otherwise, the default length is adopted.
Optionally, when the determining unit 12 determines that the UE does not have the capability of multiple receive beams and the predetermined length has multiple candidate values, the second configuring unit 14 is configured to, when the UE is expected to accept an RRC field indicating a value of the predetermined length in an RRC signaling, configure the DCI field length to 0 by the RRC field, and not configure a DCI field indicating which downlink reference signal is quasi co-located with the DMRS of the PDSCH in the DCI transmitted to the UE; when the UE does not expect to accept the RRC field indicating the value of the predetermined length in the RRC signaling, the UE is not sent the RRC field, but the default DCI length 0 is adopted, that is, a DCI field indicating the DMRS of the PDSCH and which downlink reference signal are quasi-co-located is not configured in the DCI sent to the UE.
When determining that the UE does not have the capability of receiving multiple beams according to the capability reported by the UE, the downlink beam indication method and apparatus provided in the embodiment of the present invention do not configure a DCI field for indicating the DMRS of the PDSCH and which downlink reference signal are quasi-co-located in the DCI transmitted to the UE. Compared with the prior art, the method and the device do not need to adopt a plurality of bits to indicate the downlink reference signal and the DMRS of the PDSCH as quasi-co-location when the UE does not have the capacity of receiving multiple beams, thereby saving signaling overhead.
The apparatus of this embodiment may be configured to implement the technical solutions of the method embodiments, and the implementation principles and technical effects are similar, which are not described herein again.
The embodiment of the invention also provides a base station, and the base station comprises the downlink beam indicating method device.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by a computer program, which may be stored in a computer readable storage medium and executed by a computer to implement the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A downlink beam indication method is characterized by comprising the following steps:
receiving the capability report of the UE;
determining whether the UE has the capacity of multiple receiving beams according to the reported capacity of the UE;
when the UE is determined to have the capacity of multiple receiving beams, configuring a DCI field with a preset length for indicating a demodulation reference signal (DMRS) of a Physical Downlink Shared Channel (PDSCH) and which downlink reference signal is quasi-co-located in Downlink Control Information (DCI) sent to the UE;
when the UE is determined not to have the capability of multiple receiving beams, a DCI field used for indicating the PDSCH and which downlink reference signal are quasi-co-located is not configured in the DCI transmitted to the UE.
2. The method of claim 1, wherein when it is determined that the UE has a capability of multiple receive beams and the predetermined length has 1 or more candidate values, the configuring a DCI field of the predetermined length in the DCI transmitted to the UE to indicate which downlink reference signal the DMRS of the PDSCH is co-located with comprises:
when UE is expected to receive an RRC field which represents the value of the preset length in a radio resource control RRC signaling, a DCI field which has the length equal to the value and is used for indicating that the DMRS of the PDSCH and which downlink reference signal are quasi-co-located is configured in DCI sent to the UE;
when the UE does not expect to accept the RRC field which represents the value of the preset length in the RRC signaling, a default DCI field length 0 is configured in advance for the UE, if the default length is not adopted, the DCI field length which is not equal to the default length is notified to the UE through the RRC, meanwhile, a DCI field which is used for indicating the DMRS of the PDSCH and which downlink reference signal are quasi-co-located is configured in the DCI which is sent to the UE, the DCI field length adopts the length configured by the RRC, and otherwise, the default length is adopted.
3. The method of claim 1, wherein when it is determined that the UE does not have a multi-receive beam capability and the predetermined length has 1 or more candidate values, not configuring DCI fields in the DCI transmitted to the UE to indicate which downlink reference signal the DMRS of the PDSCH is quasi co-located with comprises:
when UE (user equipment) is expected to accept an RRC field which represents the value of the preset length in an RRC signaling, the length of the DCI field is configured to be 0 by the RRC field, and a DCI field which is used for indicating the DMRS of the PDSCH and which downlink reference signal are quasi-co-located is not configured in the DCI sent to the UE;
when the UE does not expect to accept the RRC field indicating the value of the predetermined length in the RRC signaling, the UE is not sent the RRC field, but the default DCI field length 0 is adopted, that is, a DCI field indicating the DMRS of the PDSCH and which downlink reference signal are quasi-co-located is not configured in the DCI sent to the UE.
4. A downlink beam indication method device is characterized by comprising the following steps:
a receiving unit, configured to receive a capability report of a UE;
the determining unit is used for determining whether the UE has the capability of multiple receiving beams according to the capability reported by the UE;
a first configuration unit, configured to configure, when the determination unit determines that the UE has a capability of multiple receive beams, a DCI field of a predetermined length for indicating which downlink reference signal the DMRS of the PDSCH is positioned in, in DCI transmitted to the UE;
a second configuration unit, configured to, when the determining unit determines that the UE does not have the capability of multiple receive beams, not configure a DCI field indicating which downlink reference signal the DMRS of the PDSCH is quasi co-located with in the DCI transmitted to the UE.
5. The apparatus according to claim 4, wherein when the determining unit determines that the UE has a capability of multiple receive beams and the predetermined length has 1 or more candidate values, the first configuring unit is configured to configure, in DCI transmitted to the UE, a DCI field of a length equal to a value of the predetermined length, for indicating which downlink reference signal the DMRS of the PDSCH is quasi-co-located with, when the UE is expected to accept the RRC field indicating the value of the predetermined length in the radio resource control RRC signaling; and when the UE does not need to accept the RRC field which represents the value of the preset length in the RRC signaling, configuring a default DCI field length 0 for the UE in advance, if the default length is not adopted, informing the UE of the DCI field length which is not equal to the default length through the RRC, and simultaneously configuring a DCI field which is used for indicating the DMRS of the PDSCH and which downlink reference signal is quasi-co-located in the DCI sent to the UE, wherein the DCI field length adopts the length configured by the RRC, otherwise, the default length is adopted.
6. The apparatus according to claim 4, wherein when the determining unit determines that the UE does not have a capability of multiple receive beams and the predetermined length has 1 or more candidate values, the second configuring unit is configured to configure the DCI field length to 0 when the UE is expected to accept the RRC field indicating the value of the predetermined length in the RRC signaling, and not configure a DCI field indicating which downlink reference signal the DMRS of the PDSCH is quasi-co-located with in the DCI transmitted to the UE; when the UE does not expect to accept the RRC field indicating the value of the predetermined length in the RRC signaling, the UE is not sent the RRC field, but the default DCI field length 0 is adopted, that is, a DCI field indicating the DMRS of the PDSCH and which downlink reference signal are quasi-co-located is not configured in the DCI sent to the UE.
7. A base station, characterized in that the base station comprises the downlink beam indicating method device according to any one of claims 4 to 6.
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