CN110072290B - Communication method and device of LAA system - Google Patents
Communication method and device of LAA system Download PDFInfo
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Abstract
The invention provides a communication method and a communication device of an LAA system. In step one, the UE receives a higher layer signaling to determine the following information: frequency bands of the K carriers; physical resources occupied by each RS resource group in the K RS resource groups in the subframe; the antenna port of the target wireless signal and the set of K RS resources are semi-co-located. The K is a positive integer greater than 1, the K RS resource groups respectively belong to the K carriers on a frequency domain, and at least one carrier in the K carriers is deployed in an unlicensed frequency spectrum. The transmission carrier of the target wireless signal is deployed in an unlicensed spectrum. The method of the invention effectively improves the performance of channel estimation on the premise of not increasing the redundancy cost of the downlink RS, so that LAALTE after the LBT technology is introduced keeps the maximum forward compatibility.
Description
The present application is a divisional application of the following original applications:
application date of the original application: 11/month/12/2014
- -application number of the original application: 201410635223.5
The invention of the original application is named: communication method and device of LAA system
Technical Field
The present invention relates to a scheme for communication using an Unlicensed Spectrum in a wireless communication system, and in particular, to a communication method and apparatus for an Unlicensed Spectrum (Unlicensed Spectrum) based on LTE (Long Term Evolution).
Background
In a conventional 3GPP (3 rd Generation Partner Project) LTE system, data transmission can only occur on a licensed spectrum, however, with a drastic increase in traffic, especially in some urban areas, the licensed spectrum may be difficult to meet the traffic demand. The 62-time congress of the 3GPP RAN discusses a new research topic, that is, the research on unlicensed spectrum synthesis (RP-132085), and the main purpose is to research Non-standalone (dependent) deployment using LTE over unlicensed spectrum, where the Non-persistent is to associate communication over unlicensed spectrum with serving cells over licensed spectrum. An intuitive method is to reuse the concept of Carrier Aggregation (CA) in the existing system as much as possible, that is, a serving cell deployed on a licensed spectrum is used as a PCC (Primary Component Carrier) and a serving cell deployed on an unlicensed spectrum is used as an SCC (Secondary Component Carrier). For the unlicensed spectrum, considering the uncontrollable/predictable interference level, the LBT (Listen Before Talk) technology can effectively avoid interference between the LTE system and other systems and interference between different operator devices inside the LTE system. In RAN #64 congress, the communication over unlicensed spectrum is collectively named LAA (licensed Assisted Access).
For LTE LAA, one issue to consider is that the downlink RS (Reference Signal) for channel measurement scheduled in the traditional semi-static manner (due to the introduction of LBT technology) may not be transmitted on some (unpredictable) scheduled subframes. In conventional LTE, a downlink RS for Channel measurement can also assist a UE (User Equipment) to perform Channel estimation based on a DMRS (Demodulation Reference Signal), where the downlink RS for Channel measurement includes a CRS (Cell RS) and a CSI-RS (Channel state Indicator RS). In LTE LAA, the absence of the Downlink RS for Channel measurement on a part of subframes may seriously affect the receiving performance of PDSCH (Physical Downlink Shared Channel). In addition, if the downlink RS cannot be received on a given carrier for a long time, a UE (User Equipment) may lose downlink synchronization and further cause frequent downlink pre-synchronization operations on the given carrier.
In order to solve the problems, the invention discloses a communication method and a communication device of an LAA system.
Disclosure of Invention
The invention discloses a method in UE, which comprises the following steps:
-step a. Receiving higher layer signaling determines the following information:
frequency band of K carriers
Physical resources occupied by each of the K RS resource groups within the subframe
The antenna port of the target wireless signal and the set of K RS resources are semi-Co-located (Co-located).
The K is a positive integer greater than 1, the K RS resource groups respectively belong to the K carriers on a frequency domain, and at least one carrier in the K carriers is deployed in an unlicensed frequency spectrum. The transmission carrier of the target wireless signal is deployed in an unlicensed spectrum.
As an embodiment, the higher layer signaling is RRC (Radio Resource Control) signaling. For one embodiment, the physical resources include { spatial, time domain, frequency domain } resources. As an embodiment, the physical resources include { spatial domain, time domain, frequency domain, code domain (Orthogonal Covering Code) } resources.
The space domain refers to an RS antenna port. In an embodiment, the RS resource group includes a positive integer number of RS antenna ports, and each RS antenna port occupies a certain { time domain, frequency domain, code domain } resource. The two antenna ports are semi-co-located, which means that the large-scale characteristics of the channel experienced by the wireless signal transmitted by one antenna port can be deduced from the channel experienced by the wireless signal transmitted by the other antenna port, and the large-scale characteristics include one or more of { delay spread, doppler shift, average gain, average delay }. The specific description of the "semi-co-sited" refers to TS36.211.
As an embodiment, the target wireless signal is transmitted on an EPDCCH (Enhanced Physical Downlink Control Channel), and the third Information is indicated by an EPDCCH-configuration IE (Information Element). As an embodiment, the target wireless signal is transmitted on PDSCH, and the third information is indicated by PDSCH-Config IE. As an embodiment, the K carriers are all deployed in the unlicensed spectrum. As an embodiment, the K carriers are contiguous in the frequency domain.
The continuous carrier wave can ensure stronger channel correlation, and is beneficial to cross-carrier wave estimation of large-scale characteristics.
Specifically, according to one aspect of the present invention, the method further comprises the following steps:
-step B. Receiving downlink RSs on said set of K RS resources, determining large scale characteristics of a radio channel for transmitting said target radio signal
-step c. Receiving the target radio signal according to a large scale characteristic of the radio channel.
As an embodiment, the UE receives downlink RSs over the K sets of RS resources within a given time window (that is time-correlated with the radio channel) to determine large-scale characteristics of the radio channel, the given time window being self-determined by the UE. As an embodiment, the UE receives downlink RSs on S RS resource groups (frequency-dependent on the radio channel) to determine the large-scale characteristic of the radio channel, where the S RS resource groups are self-determined by the UE, and the S RS resource groups are a subset of the K RS resource groups.
Specifically, according to an aspect of the present invention, the second information includes K groups of sub information, where the K groups of sub information respectively indicate physical resources occupied by the K RS resource groups in a subframe, and each group of sub information includes one of:
CRS Port number and CRS frequency offset
Number of CSI-RS ports and CSI-RS configuration.
If the second information comprises the CRS port number and the CRS frequency information, reusing time-frequency resources of the CRS in the subframe by the corresponding RS resource group; and if the second information comprises the CSI-RS port number and the CSI-RS configuration, reusing time-frequency resources of the CSI-RS in the subframe by the corresponding RS resource group. The CRS port number is one of {1,2,4} and the CRS frequency offset is one of {0,1,2,3,4,5 }. The number of CSI-RS ports is one of {1,2,4,8}, and the CSI-RS Configuration (Configuration) is indicated by a resourceConfig IE, specifically referring to table 6.10.5.2-1 in TS36.211.
As an embodiment, the second information further comprises a generator indexThe generator index is a non-negative integer less than 504. As a sub-embodiment of the above embodiment, the mapping relationship of the generator index to the initial value of the RS sequence generator of the CRS is reused
Mapping relation to initial value of RS sequence generator of CRS (specifically described in section 6.10.1.1 of TS 36.211). As yet another sub-embodiment of the above embodiment, the mapping of the generator index to the initial value of the RS sequence generator of the CSI-RS is reused ≧ or>
Mapping relation to initial values of RS sequence generator of the CSI-RS (specifically described with reference to section 6.10.5.1 of TS 36.211).
Specifically, according to an aspect of the present invention, the K RS resource groups share the same second information, and the second information includes one of:
CRS Port number and CRS frequency offset
Number of CSI-RS ports and CSI-RS configuration.
The advantage of the above aspect is to save overhead of higher layer signaling, i.e. the K RS resource groups share the same intra-subframe configuration (except that the carrier bandwidths may be different). In addition, if a HARQ (Hybrid Automatic Repeat Request) Process (Process) to which the target radio signal belongs includes a Physical Resource Block Pair (PRBP) on different carriers, the above aspect is advantageous for the HARQ Process to share the same TM (Transmission Mode) on different carriers.
Specifically, according to an aspect of the present invention, the subframe actually occupied by each RS resource group in the time domain is configured by both the higher layer signaling and the physical layer signaling, or configured by only the physical layer signaling.
As an embodiment, for each RS resource group, the actually occupied subframes include all or part of subframes in the corresponding subframe set indicated by the higher layer signaling, where the all or part of subframes are configured by physical layer signaling or determined by the UE. As an embodiment, for each RS resource group, the actually occupied subframes include subframes that are outside the corresponding subframe set indicated by the higher layer signaling and indicated by physical layer signaling. As an embodiment of the self-determination, the UE determines according to parameters such as received power or channel statistical characteristics.
Specifically, according to an aspect of the present invention, wherein the target radio signal is transmitted on a PDSCH, the third information is indicated by a PDSCH-Config IE.
As one embodiment, the target wireless signal is transmitted on one of the K carriers for a given subframe, and the target wireless signal is transmittable on multiple ones of the K carriers for multiple subframes.
The invention discloses a method in a base station, which comprises the following steps:
-step a. Sending a higher layer signaling indicating the following information:
frequency band of K carriers
Physical resources occupied by each of the K RS resource groups within the subframe
The antenna port of the target wireless signal and the set of K RS resources are semi-co-located.
The K is a positive integer greater than 1, the K RS resource groups respectively belong to the K carriers on a frequency domain, and at least one carrier in the K carriers is deployed in an unlicensed frequency spectrum. The transmission carrier of the target wireless signal is deployed in an unlicensed spectrum.
Specifically, according to one aspect of the present invention, the method further comprises the following steps:
-step B. Transmitting downlink RS over the K RS resource groups
-step c.
Specifically, according to an aspect of the present invention, the second information includes K groups of sub information, where the K groups of sub information respectively indicate physical resources occupied by the K RS resource groups in a subframe, and each group of sub information includes one of:
CRS Port number and CRS frequency offset
Number of CSI-RS ports and CSI-RS configuration.
Specifically, according to an aspect of the present invention, the K RS resource groups share the same second information, and the second information includes one of:
CRS Port number and CRS frequency offset
Number of CSI-RS ports and CSI-RS configuration.
Specifically, according to an aspect of the present invention, the subframe actually occupied by each RS resource group in the time domain is configured by both the higher layer signaling and the physical layer signaling, or configured by only the physical layer signaling.
Specifically, according to one aspect of the present invention, it is characterized in that the target radio signal is transmitted on PDSCH, and the third information is indicated by PDSCH-Config IE.
The invention discloses a user equipment, which is characterized by comprising:
a first module: for receiving higher layer signaling, the following information is determined:
frequency band of K carriers
Physical resources occupied by each of the K RS resource groups within the subframe
The antenna port of the target wireless signal and the set of K RS resources are semi-co-located.
The K is a positive integer greater than 1, the K RS resource groups respectively belong to the K carriers on a frequency domain, and at least one carrier in the K carriers is deployed in an unlicensed frequency spectrum. The transmission carrier of the target wireless signal is deployed in an unlicensed spectrum.
As an embodiment, the first module is further configured to receive downlink RSs over the K sets of RS resources and determine large scale characteristics of a radio channel used for transmitting the target radio signal. The first module is further configured to receive the target wireless signal according to a large scale characteristic of the wireless channel.
The invention discloses a base station device, which is characterized by comprising:
a first module: for sending higher layer signaling indicating the following information:
frequency band of K carriers
Physical resources occupied by each of the K RS resource groups within the subframe
The antenna port of the target wireless signal and the set of K RS resources are semi-co-located.
The K is a positive integer greater than 1, the K RS resource groups respectively belong to the K carriers on a frequency domain, and at least one carrier in the K carriers is deployed in an unlicensed frequency spectrum. The transmission carrier of the target wireless signal is deployed in an unlicensed spectrum.
In an embodiment, the first module is further configured to send a downlink RS on the K RS resource groups. The first module is further configured to transmit the target wireless signal.
Aiming at the problem that the adoption of the LBT technology can cause that the downlink RS which is configured on the upper half part of the LAA carrier and is used for channel measurement cannot be sent in some subframes, the method ensures that the UE obtains the large-scale characteristic of the transmission channel aiming at the target wireless signal by utilizing the characteristic of 'semi-co-location' of the downlink RS on a plurality of carriers, utilizes the large-scale characteristic and combines with the DMRS on the target wireless signal to estimate the small-scale characteristic, and effectively improves the performance of channel estimation on the premise of not increasing the redundancy overhead of the downlink RS. The invention ensures that the LAA LTE after the LBT technology is introduced keeps the maximum forward compatibility.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments thereof, made with reference to the following drawings:
fig. 1 shows a flow diagram of downlink transmission on an LAA carrier according to one embodiment of the invention;
FIG. 2 shows a subframe distribution diagram of K RS resource groups according to an embodiment of the invention;
fig. 3 shows a block diagram of a processing device in a UE according to an embodiment of the invention;
fig. 4 shows a block diagram of a processing means in a base station according to an embodiment of the invention;
Detailed Description
The technical solutions of the present invention will be further described in detail with reference to the accompanying drawings, and it should be noted that the features of the embodiments and examples of the present application may be arbitrarily combined with each other without conflict.
Example 1
For base station N1, the higher layer signaling indicates the following information in step S11:
frequency band of K carriers
Physical resources occupied by each of the K RS resource groups within the subframe
The antenna port of the target wireless signal and the set of K RS resources are semi-co-located.
And transmitting the downlink RS on the K RS resource groups in step S12. The target wireless signal is transmitted in step S13.
For UE U2, receiving higher layer signaling in step S21 determines the first information, the second information and the third information. Receiving downlink RSs on the K RS resource groups in step S22, and determining a large scale characteristic of a radio channel used for transmitting the target radio signal. The target wireless signal is received according to the large scale characteristics of the wireless channel in step S23.
In embodiment 1, K is a positive integer greater than 1, the K RS resource groups respectively belong to the K carriers in a frequency domain, and at least one carrier of the K carriers is deployed in an unlicensed spectrum. The transmission carrier of the target wireless signal is deployed in an unlicensed spectrum.
As sub-embodiment 1 of embodiment 1, the second information includes K sets of sub-information, where the K sets of sub-information respectively indicate physical resources occupied by the K RS resource sets in a subframe, and each set of sub-information includes CSI-RS port number and CSI-RS configuration.
As sub-embodiment 2 of embodiment 1, in step S22, the UE U2 first performs channel estimation on positive integer RS ports in each of the K RS resource groups, determines a large-scale characteristic of a corresponding carrier, and then performs linear averaging on the large-scale characteristics on the K carriers to obtain the large-scale characteristic of the radio channel.
As a sub-embodiment 3 of embodiment 1, the K sets of RS resources share the same second information, and the second information includes one of:
CRS Port number and CRS frequency offset
Number of CSI-RS ports and CSI-RS configuration.
Example 2
The base station firstly sends the following information of the high-level signaling indication:
frequency band of K carriers (1 st to K carriers in FIG. 2)
Second information, physical resources occupied by each of the K RS resource groups (1 st RS resource group to Kth RS resource group) in the subframe
The antenna port of the target wireless signal and the set of K RS resources are semi-co-located.
And then transmitting downlink RSs on the K RS resource groups (as shown by a small square with the reference number i in figure 2), and then transmitting the target wireless signals.
In embodiment 2, K is a positive integer greater than 1, the K RS resource groups belong to the K carriers in a frequency domain, and at least one of the K carriers is deployed in an unlicensed spectrum. The transmission carrier of the target wireless signal is deployed in an unlicensed spectrum.
In embodiment 2, the higher layer signaling further indicates subframes where the K RS resource groups are periodically transmitted in the time domain (the periodically transmitted subframe of each RS resource group is shown as a small square on a corresponding carrier in fig. 2 — the small square includes a small square with an identification number and a small square with oblique lines for identification). The base station performs LBT operation to determine a part of the periodic transmission subframes to be used for actual transmission, and maintains zero transmission power (namely, does not transmit downlink RS) on other subframes. And the base station sends physical layer signaling to indicate the part of the subframes.
As sub-embodiment 1 of embodiment 2, the target radio signal is transmitted on the PDSCH, and the third information is indicated by a PDSCH-Config information element.
As sub-embodiment 2 of embodiment 2, the K carriers are contiguous in the frequency domain.
As sub-embodiment 3 of embodiment 2, when the base station maintains zero transmission power on a given subframe (belonging to an RS periodic transmission subframe) of a given carrier, the UE can compensate the large-scale characteristic of the radio channel experienced by the target radio signal by using downlink RSs transmitted on other carriers in the given subframe or in the vicinity of the given subframe, so as to avoid a significant decrease in channel estimation performance.
Example 3
Embodiment 3 illustrates a block diagram of a processing device in a UE, as shown in fig. 3. In fig. 3, the UE processing apparatus 200 is composed of a receiving module 201.
The receiving module 201 is configured to receive a higher layer signaling to determine the following information:
frequency band of K carriers
Physical resources occupied by each of the K RS resource groups within the subframe
The antenna port of the target wireless signal and the set of K RS resources are semi-co-located.
In embodiment 3, K is a positive integer greater than 1, the K RS resource groups respectively belong to the K carriers in a frequency domain, and at least one carrier of the K carriers is deployed in an unlicensed spectrum. The transmission carrier of the target wireless signal is deployed in an unlicensed spectrum.
As sub-embodiment 1 of embodiment 3, the receiving module 201 is further configured to receive downlink RSs in the K RS resource groups, and determine a large-scale characteristic of a radio channel used for transmitting the target radio signal; and for receiving the target wireless signal according to a large scale characteristic of the wireless channel.
As sub-embodiment 2 of embodiment 3, the target radio signal is transmitted on the PDSCH or on the EPDCCH.
As sub-embodiment 3 of embodiment 3, the target wireless signal is transmitted on any one of the K carriers.
Example 4
Embodiment 4 illustrates a block diagram of a processing device in a base station, as shown in fig. 4. In fig. 4, the base station processing apparatus 400 is composed of a transmitting module 401.
The sending module 401 is configured to send the following information indicated by the higher layer signaling:
frequency band of K carriers
Physical resources occupied by each of the K RS resource groups within the subframe
The antenna port of the target wireless signal and the set of K RS resources are semi-co-located.
In embodiment 4, K is a positive integer greater than 1, the K RS resource groups respectively belong to the K carriers in a frequency domain, and at least one carrier of the K carriers is deployed in an unlicensed spectrum. The transmission carrier of the target wireless signal is deployed in an unlicensed spectrum.
As sub-embodiment 1 of embodiment 4, the sending module 401 is further configured to send a downlink RS on the K RS resource groups, and to send the target radio signal.
As sub-embodiment 2 of embodiment 4, the K carriers are all deployed in an unlicensed spectrum, and the target wireless signal is transmitted on any one of the K carriers.
It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a hard disk or an optical disk. Alternatively, all or part of the steps of the above embodiments may be implemented by using one or more integrated circuits. Accordingly, the module units in the above embodiments may be implemented in a hardware form, or may be implemented in a form of software functional modules, and the present application is not limited to any specific form of combination of software and hardware.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (20)
1. A method in a UE, comprising the steps of:
-step a. Receiving radio resource control signalling determines the following information:
-first information frequency band of K carriers;
physical resources occupied by each of the K RS resource groups in the subframe;
the antenna port of the target radio signal and the set of K RS resources are semi-co-located;
receiving downlink RSs on at least part of the K RS resource groups, and determining large-scale characteristics of a radio channel for transmitting the target radio signal;
-step c. Receiving the target radio signal according to a large scale characteristic of the radio channel;
the K is a positive integer greater than 1, the K RS resource groups respectively belong to the K carriers on a frequency domain, and at least one carrier in the K carriers is deployed in an unlicensed frequency spectrum; a transmission carrier of the target wireless signal is deployed in an unlicensed spectrum; the target wireless signal is transmitted on the PDSCH.
2. The method of claim 1, wherein the second information comprises K sets of sub-information, and wherein the K sets of sub-information respectively indicate physical resources occupied by the K sets of RS resources in a subframe, and wherein each set of sub-information comprises a CSI-RS port number and a CSI-RS configuration.
3. The method of claim 1, wherein the K RS resource groups share the same second information, and wherein the second information comprises one of:
CRS port number and CRS frequency offset
Number of CSI-RS ports and CSI-RS configuration.
4. The method of claim 2, wherein subframes actually occupied by each RS resource group in a time domain are jointly configured by higher layer signaling and physical layer signaling.
5. The method according to any of claims 1-4, wherein the target wireless signal is transmitted on PDSCH and the third information is indicated by PDSCH-Config IE.
6. A method in a base station, comprising the steps of:
-step a. Sending radio resource control signalling indicating the following information:
-first information frequency band of K carriers;
physical resources occupied by each of the K RS resource groups in the subframe;
the antenna port of the target radio signal and the set of K RS resources are semi-co-located;
step B, sending downlink RS on the K RS resource groups;
-step c. Transmitting the target wireless signal;
the K is a positive integer greater than 1, the K RS resource groups respectively belong to the K carriers on a frequency domain, at least one carrier in the K carriers is deployed in an unlicensed frequency spectrum, and a transmission carrier of the target wireless signal is deployed in the unlicensed frequency spectrum.
7. The method of claim 6, wherein the second information comprises K sets of sub-information, and wherein the K sets of sub-information respectively indicate physical resources occupied by the K RS resource groups in a subframe, and wherein each set of sub-information comprises a CSI-RS port number and a CSI-RS configuration.
8. The method of claim 6, wherein the K RS resource groups share the same second information, and wherein the second information comprises one of:
CRS Port number and CRS frequency offset
Number of CSI-RS ports and CSI-RS configuration.
9. The method of claim 7, wherein subframes actually occupied by each RS resource group in a time domain are configured by high layer signaling and physical layer signaling together.
10. The method according to any of claims 6 to 9, wherein the target wireless signal is transmitted on PDSCH and the third information is indicated by PDSCH-Config IE.
11. A user equipment, characterized in that the equipment comprises:
a first module: for receiving radio resource control signaling, determining the following information:
-first information frequency band of K carriers;
physical resources occupied by each of the K RS resource groups in the subframe;
the antenna port of the target radio signal and the set of K RS resources are semi-co-located;
and (c) a second step of,
receiving downlink RSs on at least part of the RS resource groups in the K RS resource groups, and determining the large-scale characteristic of a wireless channel for transmitting the target wireless signal;
receiving the target wireless signal according to the large-scale characteristic of the wireless channel;
the K is a positive integer greater than 1, the K RS resource groups respectively belong to the K carriers on a frequency domain, at least one carrier in the K carriers is deployed in an unlicensed frequency spectrum, and a transmission carrier of the target wireless signal is deployed in the unlicensed frequency spectrum; the target wireless signal is transmitted on the PDSCH.
12. The UE of claim 11, wherein the second information comprises K sets of sub-information, and wherein the K sets of sub-information respectively indicate physical resources occupied by the K RS resource groups in a subframe, and each set of sub-information comprises a CSI-RS port number and a CSI-RS configuration.
13. The UE of claim 11, wherein the K RS resource groups share the same second information, and wherein the second information comprises one of:
CRS port number and CRS frequency offset;
number of CSI-RS ports and CSI-RS configuration.
14. The UE of claim 12, wherein subframes actually occupied by each RS resource group in a time domain are configured by high layer signaling and physical layer signaling together.
15. The user equipment according to any of claims 11-13, wherein the third information is indicated by a PDSCH-Config information element.
16. A base station apparatus, characterized in that the apparatus comprises:
a first module: for transmitting radio resource control signaling indicating the following information:
-first information frequency band of K carriers;
physical resources occupied by each of the K RS resource groups in the subframe;
the antenna port of the target radio signal and the set of K RS resources are semi-co-located;
and the number of the first and second groups,
sending downlink RSs on the K RS resource groups;
transmitting the target wireless signal; the K is a positive integer greater than 1, the K RS resource groups respectively belong to the K carriers on a frequency domain, at least one carrier in the K carriers is deployed in an unlicensed frequency spectrum, and a transmission carrier of the target wireless signal is deployed in the unlicensed frequency spectrum; the target wireless signal is transmitted on the PDSCH.
17. The base station device of claim 16, wherein the second information includes K sets of sub information, and wherein the K sets of sub information respectively indicate physical resources occupied by the K sets of RS resources in a subframe, and each set of sub information includes a CSI-RS port number and a CSI-RS configuration.
18. The base station device of claim 16, wherein the K sets of RS resources share the same second information, and wherein the second information comprises one of:
CRS port number and CRS frequency offset;
number of CSI-RS ports and CSI-RS configuration.
19. The base station device of claim 17, wherein the subframe actually occupied by each RS resource group in the time domain is configured by higher layer signaling and physical layer signaling together.
20. The base station device according to any of claims 16 to 19, characterized in that the third information is indicated by a PDSCH-Config information element.
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| US10512033B2 (en) * | 2015-01-29 | 2019-12-17 | Qualcomm Incorporated | Timing information for discovery in unlicensed spectrum |
| US10805954B2 (en) | 2016-06-22 | 2020-10-13 | Telefonaktiebolaget Lm Ericsson (Publ) | Multi-grant for listen-before-talk based uplink transmission attempts |
| CN107659349B (en) * | 2016-07-25 | 2021-01-26 | 上海朗帛通信技术有限公司 | Method and device in wireless transmission |
| KR102431635B1 (en) * | 2016-11-04 | 2022-08-12 | 삼성전자 주식회사 | Adaptive retransmission method and apparatus for latency reduction in wirelss cellular communication system |
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| CN108271264B (en) * | 2017-01-03 | 2020-06-30 | 上海朗帛通信技术有限公司 | Method and device used in UE (user equipment) and base station for multi-antenna transmission |
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| CN105656607B (en) | 2019-06-28 |
| CN105656607A (en) | 2016-06-08 |
| CN110072290A (en) | 2019-07-30 |
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