CN109936432B - Method and device for LAA transmission in UE and base station - Google Patents
Method and device for LAA transmission in UE and base station Download PDFInfo
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- CN109936432B CN109936432B CN201910270609.3A CN201910270609A CN109936432B CN 109936432 B CN109936432 B CN 109936432B CN 201910270609 A CN201910270609 A CN 201910270609A CN 109936432 B CN109936432 B CN 109936432B
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Abstract
The invention provides a method and a device for LAA transmission in UE and a base station. The UE receives a first signaling in a first subframe in the first step, and the first signaling triggers the transmission of an uplink RS on a first carrier; and in the second step, a sensing operation is carried out on the first time slot of the first carrier to determine whether to transmit the uplink RS, if the uplink RS is determined to be transmitted, the first RS is transmitted on the second time slot of the first carrier, otherwise, zero transmission power is kept on the second time slot of the first carrier. Wherein the first signaling is physical layer signaling, and the first carrier is deployed in an unlicensed spectrum. The scheme of the invention enables the base station to dynamically configure the time domain resource for uplink RS transmission so as to ensure that the base station obtains the CSI of the LAA carrier as soon as possible. In addition, the invention reuses the prior SRS proposal as much as possible, and has good compatibility.
Description
The present application is a divisional application of the following original applications:
application date of the original application: 12 months 03 days 2014
- -application number of the original application: 201410727605.0
The invention of the original application is named: LAA transmission method and device
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 (3rd 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 3GPP RAN discussed a new research topic, namely the study of unlicensed spectrum synthesis (RP-132085), and the main objective was to study Non-standalone (Non-persistent) deployments with LTE over unlicensed spectrum, where communication over unlicensed spectrum is to be associated with serving cells over licensed spectrum. An intuitive approach is to reuse the concept of CA (Carrier Aggregation) in the existing system as much as possible, i.e., a serving Cell deployed on a licensed spectrum as a Pcell (Primary Cell) and a serving Cell deployed on an unlicensed spectrum as a Scell (Secondary Cell). For unlicensed spectrum, LTE may employ LBT (Listen Before Talk) on unlicensed spectrum to avoid interference, taking into account its uncontrollable/predictable interference level. An LBT, i.e. a base station or a UE (User Equipment), first listens to the received power on an unlicensed spectrum before transmitting a signal, and transmits a signal on the unlicensed spectrum if it is determined from the received power that there are no interferers on the unlicensed spectrum, otherwise does not transmit a signal. In RAN #64 congress (seminar), communication over unlicensed spectrum is uniformly named LAA (licensed Assisted Access).
The unlicensed spectrum may operate in a TDD (Time Division Duplex) mode, i.e., the unlicensed spectrum is used for transmitting downlink and uplink wireless signals. In the uplink wireless Signal, SRS (Sounding Reference Signal) plays an important role — SRS can indicate csi (channel Status indicator) of the LAA carrier.
In conventional LTA, the position of the SRS in a subframe is fixed, i.e., located in the last SC-FDMA (Single Carrier Frequency Division Multiplexing Access) symbol of the subframe (or the last two SC-FDMA symbols of a special subframe). Further, the SRS (possibly occupied) subframe is configured by higher layer signaling.
If the UE side also performs LBT operation in LAA transmission, the conventional SRS scheme may suffer from problems:
target UE is likely to detect uplink signals of other UEs when performing LBT before scheduled SRS symbol, i.e. the result of listening operation in LBT is interfered with
The SRS subframe indicated semi-statically is likely to be unusable (the base station cannot receive or the UE cannot transmit), so that the UE cannot report the CSI in time.
In view of the above problems, the present application discloses a method and an apparatus for LAA transmission.
Disclosure of Invention
The application discloses a method for UE in unlicensed spectrum communication, which comprises the following steps:
-step a. receiving a first signaling in a first subframe, the first signaling triggering transmission of an uplink RS on a first carrier
-step b. performing a listening operation on a first time slot of the first carrier to determine whether to send an uplink RS (Reference Signal). And if the uplink RS is determined to be transmitted, transmitting the first RS in the second time slot on the first carrier, otherwise, keeping the zero transmission power in the second time slot on the first carrier.
Wherein the first signaling is physical layer signaling, and the first carrier is deployed in an unlicensed spectrum. The first RS occupies K1 wideband symbols in the time domain, where K1 is a positive integer. The subframe to which the second time slot belongs is an nth subframe after the first subframe, and n is a predetermined positive integer; or the second time slot is indicated by the first signaling display. And the subframe to which the second time slot belongs is not reserved for the uplink RS by high-layer signaling.
The uplink RS refers to a radio signal which is transmitted to the base station by the UE and whose RS sequence and radio Resource Mapping (Resource Mapping) are predetermined (i.e., known in advance by both the UE and the base station). As an embodiment, the uplink RS is a PRACH (Physical Random Access Channel) pilot (Preamble).
As an embodiment, a bit indicating the second slot is not included in the first signaling. As an embodiment, the position of the second slot in the subframe is predetermined or configured by higher layer signaling.
The explicit (explicit) indication means that a bit for indicating the second slot is included in the first signaling. As an embodiment of displaying the indication, the subframe to which the second slot belongs is indicated by the first signaling, and the position of the second slot in the subframe is predetermined or configured by higher layer signaling. As an embodiment of the display indication, the subframe to which the second slot belongs is an nth subframe after the first subframe, where n is a predetermined positive integer, and the position of the second slot in the subframe is indicated by the first signaling.
As one embodiment, the wideband symbols are SC-FDMA symbols. As an embodiment, the wideband symbol is an OFDM (Orthogonal Frequency Division Multiplexing) symbol. As one example, the K1 is one of {1, 2, 4, 8 }. As an embodiment, the base station configures the first carrier as a normal CP, and the duration of the wideband symbol is 2192Ts (wideband symbol except for the first wideband symbol in the subframe) or 2208Ts (wideband symbol first in the subframe), where Ts is 1/30720ms (millisecond).
As an embodiment, the listening operation is performed by determining to transmit an uplink RS if the received signal power detected by the UE in the first time slot is less than a given threshold (fixed or configurable), and otherwise determining not to transmit the uplink RS.
The essence of the above method is that the UE can dynamically determine the time domain resource for transmitting the uplink RS (according to the indication of the base station) and trigger the transmission of the UE. Compared to the conventional a (aperiodic) -SRS, the time domain resource for transmitting the uplink RS can be present (if any) outside the candidate resource configured by the higher layer signaling. The method ensures that the UE sends the uplink SRS as timely as possible, and meets the real-time requirement of the base station side on the CSI.
Specifically, according to an aspect of the present application, the step a further includes the steps of:
step A0. receives the second signaling to determine the position of the given information bit group in the L1 information bit groups.
Wherein the first signaling comprises the L1 information bit groups, and the given information bit group triggers the transmission of the uplink RS of the UE. Each of the information bit groups includes L2 bits, the L1 is a positive integer greater than 1, the L2 is a positive integer, and the second signaling is higher layer signaling.
As an embodiment, the interval between the first time slot and the second time slot is less than 20us (microsecond), i.e. the UE transmits the first RS immediately after performing the listening operation or maintains zero transmission power (i.e. abandons the transmission of the first RS). As an embodiment, each of the information bit groups corresponds to one UE. As an embodiment, the starting time of the first slot is located at the starting time of the subframe. As an embodiment, the L2 is 1, and the L2 bits are used to indicate whether the corresponding UE transmits an uplink RS. As an embodiment, the L2 is 2, and the L2 bits are used to indicate whether the corresponding UE transmits an uplink RS and (if so), the K1.
As an embodiment, the subframe to which the second slot belongs is a subframe other than the SRS subframe configured by the base station through higher layer signaling.
Specifically, according to an aspect of the present application, the step B further includes the steps of:
step B0. is determining whether to transmit uplink physical layer data based on the sensing operation, and if it is determined to transmit uplink physical layer data, transmitting the first physical layer data in a time interval between the first time slot and the second time slot on the first carrier, otherwise maintaining zero transmit power in the time interval.
The first signaling is DCI (Downlink Control Information) for scheduling uplink physical layer data, the K1 is 1, and the second time slot is a last wideband symbol of a subframe scheduled by the first signaling.
As an embodiment, the time interval includes a positive integer number of wideband symbols, and the transmission decision criteria of the uplink RS and the uplink physical layer data are the same (e.g., the same received signal power threshold). As an embodiment, the starting time of the first slot is located at the starting time of the subframe. As an embodiment, the format of the first signaling is DCI format 0 or DCI format 4 or a newly defined DCI for scheduling the LAA carrier.
As an embodiment, the subframe to which the second slot belongs is a subframe other than the SRS subframe configured by the base station through higher layer signaling.
Specifically, according to an aspect of the present application, the step a further includes the steps of:
-a step a1. receiving third signaling to determine said K1, the third signaling being higher layer signaling.
Specifically, according to one aspect of the present application, the pattern of the first RS within the wideband symbol reuses the SRS pattern within the wideband symbol and the SRS sequence of the SRS.
As an embodiment, the parameters of the first RS are configured by higher layer signaling, and the parameters include all or part of Information in SRS-ConfigAp-r10IE (Information Element).
As an example, the K1 is greater than 1, and the first RS extends mapping within symbols onto the K1 wideband symbols in the form of an OCC (Orthogonal Covering Code).
The application discloses a method for a base station of unlicensed spectrum communication, which comprises the following steps:
-step a. sending a first signaling in a first subframe, the first signaling triggering transmission of an uplink RS on a first carrier
Detecting an uplink RS triggered by the first signaling on a second slot of the first carrier, wherein the first RS corresponds to the first UE.
Wherein the first signaling is physical layer signaling, and the first carrier is deployed in an unlicensed spectrum. The first RS occupies K1 wideband symbols in the time domain, where K1 is a positive integer. The subframe to which the second time slot belongs is an nth subframe after the first subframe, and n is a predetermined positive integer; or the second time slot is indicated by the first signaling display. And the subframe to which the second time slot belongs is not reserved for the uplink RS by high-layer signaling.
The implicit indication means that the first signaling does not include a bit for indicating the second slot. The explicit indication means that a bit for indicating the second slot is included in the first signaling.
The first RS corresponds to the first UE, that is, if the first RS is detected, the first RS is sent by the first UE. As an embodiment, the base station detects multiple (frequency division multiplexing or code division multiplexing) target RSs over a first slot, where the first RS (if present) is transmitted by the first UE.
As one embodiment, the first signaling is sent on a carrier deployed in a licensed spectrum.
As an embodiment, the first signaling triggers only the first RS. As one embodiment, the first signaling triggers a plurality of RSs including the first RS.
As an embodiment of the step B, the base station performs channel estimation according to all the target RS(s) triggered by the first signaling, and if the calculated channel capacity is higher than a certain threshold, the base station determines that the corresponding target RS is transmitted by the UE and adopts CSI of the corresponding first carrier, otherwise the base station determines that the corresponding target RS is not transmitted by the UE, i.e., discards CSI of the corresponding first carrier.
As an embodiment of the step B, the base station determines an actually transmitted RS of all the target RS(s) triggered by the first signaling according to the received UE response, and performs channel estimation on the actually transmitted RS to obtain CSI of the first carrier. The UE acknowledgement is 1 bit for indicating whether to perform the first signaling scheduling.
Specifically, according to an aspect of the present application, the step a further includes the steps of:
step A0. sending a second signaling indicating the position of the uplink RS scheduling information bit group of each UE in the target UE group in the L1 information bit groups.
Wherein the second signaling indicates a position of a given information bit group in L1 information bit groups, the target UE group includes at least a first UE, the target UE group includes at most L1 UEs, the first signaling includes the L1 information bit group, and the given information bit group triggers transmission of an uplink RS of the first UE. Each of the information bit groups includes L2 bits, the L1 is a positive integer greater than 1, the L2 is a positive integer, and the second signaling is higher layer signaling.
As an embodiment, the subframe to which the second slot belongs is a subframe other than the SRS subframe configured by the base station through higher layer signaling.
Specifically, according to an aspect of the present application, the step B further includes the steps of:
step B0. detects first physical layer data in a time interval between the first time slot and the second time slot on the first carrier, the first physical layer data corresponding to the first UE.
The first signaling is DCI for scheduling uplink physical layer data, K1 is 1, and the second slot is the last wideband symbol of the subframe scheduled by the first signaling.
As an embodiment, the subframe to which the second slot belongs is a subframe other than the SRS subframe configured by the base station through higher layer signaling.
Specifically, according to an aspect of the present application, the step a further includes the steps of:
-step a1. sending a third signaling indication said K1, the third signaling being higher layer signaling.
As an embodiment, the third signaling is cell common RRC layer signaling.
Specifically, according to one aspect of the present application, the pattern of the first RS within the wideband symbol reuses the SRS pattern within the wideband symbol and the SRS sequence of the SRS.
As an embodiment, the K1 is greater than 1, and the first RS spreads the mapping within a symbol over the K1 wideband symbols in an OCC manner.
The application discloses a user equipment for communicating in an unlicensed spectrum, the equipment comprising:
a first module: for receiving a first signaling in a first subframe, the first signaling triggering transmission of an uplink RS on a first carrier
A second module: for performing a sensing operation on a first slot of a first carrier to determine whether to transmit an uplink RS. And if the uplink RS is determined to be transmitted, transmitting the first RS in the second time slot on the first carrier, otherwise, keeping the zero transmission power in the second time slot on the first carrier.
Wherein the first signaling is physical layer signaling, and the first carrier is deployed in an unlicensed spectrum. The first RS occupies K1 wideband symbols in the time domain, where K1 is a positive integer. The subframe to which the second time slot belongs is an nth subframe after the first subframe, and n is a predetermined positive integer; or the second time slot is indicated by the first signaling display. And the subframe to which the second time slot belongs is not reserved for the uplink RS by high-layer signaling.
As an embodiment, the first module is further for at least one of:
receiving the second signaling determines the position of the given information bit group in the L1 information bit groups.
Receiving third signaling to determine said K1, the third signaling being higher layer signaling.
Wherein the first signaling comprises the L1 information bit groups, and the given information bit group triggers the transmission of the uplink RS of the UE. Each of the information bit groups includes L2 bits, the L1 is a positive integer greater than 1, the L2 is a positive integer, and the second signaling is higher layer signaling.
As an embodiment, the second module is further to:
determining whether to transmit uplink physical layer data based on the sensing operation, and if it is determined to transmit uplink physical layer data, transmitting the first physical layer data in a time interval between a first time slot and a second time slot on a first carrier, otherwise maintaining zero transmit power in the time interval.
The first signaling is DCI for scheduling uplink physical layer data, K1 is 1, and the second slot is the last wideband symbol of the subframe scheduled by the first signaling.
As an embodiment, the above user equipment is characterized in that the pattern of the first RS within the wideband symbol reuses the SRS pattern within the wideband symbol and the RS sequence of the SRS.
The application discloses a base station device for communication in an unlicensed spectrum, the device comprising:
a first module: for sending a first signaling in a first subframe, the first signaling triggering transmission of an uplink RS on a first carrier
A second module: and the uplink RS is used for detecting the uplink RS triggered by the first signaling on the second time slot of the first carrier, wherein the first RS corresponds to the first UE.
Wherein the first signaling is physical layer signaling, and the first carrier is deployed in an unlicensed spectrum. The first RS occupies K1 wideband symbols in the time domain, where K1 is a positive integer. The subframe to which the second time slot belongs is an nth subframe after the first subframe, and n is a predetermined positive integer; or the second time slot is indicated by the first signaling display. And the subframe to which the second time slot belongs is not reserved for the uplink RS by high-layer signaling.
As an embodiment, the first module is further for at least one of:
sending a second signaling indicating the location of the uplink RS scheduling information bit group of each UE in the target UE group in the L1 information bit groups.
Sending a third signaling indicating said K1, the third signaling being higher layer signaling.
Wherein the second signaling indicates a position of a given information bit group in L1 information bit groups, the target UE group includes at least a first UE, the target UE group includes at most L1 UEs, the first signaling includes the L1 information bit group, and the given information bit group triggers transmission of an uplink RS of the first UE. Each of the information bit groups includes L2 bits, the L1 is a positive integer greater than 1, the L2 is a positive integer, and the second signaling is higher layer signaling.
As an embodiment, the second module is further to:
detecting first physical layer data in a time interval between a first time slot and a second time slot on a first carrier, the first physical layer data corresponding to a first UE.
The first signaling is DCI for scheduling uplink physical layer data, K1 is 1, and the second slot is the last wideband symbol of the subframe scheduled by the first signaling.
As an embodiment, the base station apparatus is characterized in that the pattern of the first RS within the wideband symbol reuses the pattern of the SRS within the wideband symbol and the RS sequence of the SRS.
For LAA communication in which a UE side executes LBT operation, aiming at the problems that the interception operation is interfered by uplink physical layer data and the UE cannot report CSI in time caused by the traditional SRS scheme, the scheme of the application enables the base station to dynamically configure time domain resources for uplink RS transmission. As an embodiment, the scheme of the present application supports multiple consecutive wideband symbols for transmitting uplink RSs, so that allocation of a time domain resource can accommodate more uplink RSs transmitted by a UE. The scheme of the application ensures that the base station can obtain the CSI of the LAA carrier as timely as possible. In addition, the existing SRS scheme is reused as much as possible, and the method has good compatibility.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 illustrates a transmission flowchart of an uplink RS according to an embodiment of the present application;
fig. 2 shows a timing diagram of uplink RS scheduling according to an embodiment of the present application;
FIG. 3 illustrates a transmission timing diagram of uplink RS and physical layer data according to an embodiment of the application;
fig. 4 illustrates a structure diagram of an uplink RS according to an embodiment of the present application;
FIG. 5 shows a block diagram of first signaling according to an embodiment of the present application;
FIG. 6 shows a block diagram of a processing device in a UE according to an embodiment of the present application;
fig. 7 shows a block diagram of a processing means in a base station according to an embodiment of the present application;
Detailed Description
The technical solutions of the present application will be further described in detail with reference to the accompanying drawings, and it should be noted that the embodiments and features of the embodiments of the present application can be arbitrarily combined with each other without conflict.
Example 1
For the base station N1, transmitting a first signaling in the first subframe in step S11, the first signaling triggering transmission of an uplink RS on the first carrier; detecting an uplink RS triggered by the first signaling on a second slot of the first carrier in step S12, wherein the first RS corresponds to the UE U2. .
For the UE U2, receiving first signaling in a first subframe in step S21, the first signaling triggering transmission of an uplink RS on a first carrier; a sensing operation is performed on a first slot on the first carrier to determine whether to transmit an uplink RS in step S221, and if it is determined to transmit the uplink RS, the first RS is transmitted in a second slot on the first carrier in step S222, otherwise zero transmission power is maintained in the second slot on the first carrier in step S223.
In embodiment 1, the first signaling is physical layer signaling, and the first carrier is deployed in an unlicensed spectrum. The first RS occupies K1 wideband symbols in the time domain, where K1 is a positive integer. The subframe to which the second time slot belongs is an nth subframe after the first subframe, and n is a predetermined positive integer; or the second time slot is indicated by the first signaling display. And the subframe to which the second time slot belongs is not reserved for the uplink RS by high-layer signaling. .
As sub-embodiment 1 of embodiment 1, the base station N1 transmits a third signaling indication K1 in step S10. The UE U2 receives the third signaling in step S20 to determine the K1. The third signaling is RRC (Radio Resource Control) signaling.
As sub-embodiment 2 of embodiment 1, the first signaling is sent on a carrier deployed in a licensed spectrum.
As sub-embodiment 3 of embodiment 1, the first signaling display indicates at least one of:
sub-frame to which the second slot belongs
The start of the second slot in the subframe (the start of the second slot is located at the start of the wideband symbol in the subframe)
The K1.
As sub-embodiment 4 of embodiment 1, the first signaling triggers a plurality of UEs to transmit uplink RSs.
As sub-embodiment 5 of embodiment 1, the pattern of the SRS in the wideband symbol and the RS sequence of the SRS are reused in the pattern of the uplink RS in the wideband symbol triggered by the first signaling.
Example 2
The base station firstly sends a first signaling to a first subframe on a second carrier, and the first signaling triggers the transmission of an uplink RS on the first carrier; and then detecting an uplink RS triggered by the first signaling on a second time slot of the first carrier, wherein the first RS corresponds to the first UE.
The first UE firstly receives a first signaling at a first subframe on a second carrier, and the first signaling triggers the transmission of an uplink RS on the first carrier; and then performs a sensing operation on a first slot of the first carrier to determine whether to transmit an uplink RS. And if the uplink RS is determined to be transmitted, transmitting the first RS in the second time slot on the first carrier, otherwise, keeping the zero transmission power in the second time slot on the first carrier.
In embodiment 2, the first signaling is physical layer signaling, the first carrier is deployed in an unlicensed spectrum, and the second carrier is deployed in a licensed spectrum. The first RS occupies K1 wideband symbols in the time domain, where K1 is a positive integer. The subframe to which the second time slot belongs is an nth subframe after the first subframe, and n is a predetermined positive integer; or the second time slot is indicated by the first signaling display. And the subframe to which the second time slot belongs is not reserved for the uplink RS by high-layer signaling. The time interval between the first and second time slots is less than 20us (Rx/Tx state switching for the first UE).
As sub-embodiment 1 of embodiment 2, the base station sends a second signaling to indicate the position of the uplink RS scheduling information bit group of each UE in the target UE group in L1 information bit groups. The first UE receives the second signaling to determine the location of the given information bit group in the L1 information bit groups.
In sub-embodiment 1 of embodiment 2, the second signaling indicates a position of a given information bit group in L1 information bit groups, the target UE group includes at least a first UE, the target UE group includes at most L1 UEs, the first signaling includes the L1 information bit groups, and the given information bit group triggers transmission of an uplink RS of the first UE. Each of the information bit groups includes L2 bits, the L1 is a positive integer greater than 1, the L2 is a positive integer, and the second signaling is higher layer signaling. The first signaling is marked by a Radio Network Temporary Identifier (RNTI) common to the cells, that is, CRC (Cyclic Redundancy Check) bits of the first signaling are scrambled by the RNTI common to the cells. As a sub-embodiment of sub-embodiment 1 of embodiment 2, the first signaling is located in a Common Search Space (CSS) of a Physical Downlink Control Channel (PDCCH).
As sub-embodiment 2 of embodiment 2, the second slot occupies the last K1 wideband symbols within the subframe, as shown by the first subframe timing in fig. 2.
As sub-embodiment 3 of embodiment 2, the start time of the first slot is the start time of the sub-frame, as shown by the second sub-frame timing in fig. 2.
Example 3
Embodiment 3 illustrates a transmission timing diagram of uplink RS and physical layer data, as shown in fig. 3. In fig. 3, the squares marked with oblique lines are the first time slots, the squares marked with reverse oblique lines are the second time slots, and the squares marked with cross lines are the time intervals between the first time slots and the second time slots.
The base station firstly sends a first signaling in a first subframe, and the first signaling triggers the transmission of an uplink RS on a first carrier; and then detecting an uplink RS triggered by the first signaling in a second time slot of the first carrier and detecting first physical layer data in a time interval between the first time slot and the second time slot on the first carrier, wherein the first RS corresponds to the first UE.
The first UE firstly receives a first signaling in a first subframe, and the first signaling triggers the transmission of an uplink RS on a first carrier; a listening operation is then performed on a first slot of the first carrier to determine whether to transmit the uplink RS and uplink physical layer data. If it is determined to transmit the uplink RS, the first RS is transmitted at the second slot on the first carrier and the first physical layer data is transmitted in a time interval between the first slot and the second slot on the first carrier, otherwise zero transmit power is maintained in the second slot on the first carrier and the time interval between the first slot and the second slot.
In embodiment 3, the first signaling is DCI for scheduling uplink physical layer data, and the first carrier is deployed in an unlicensed spectrum. The first RS occupies K1 wideband symbols in the time domain, where K1 is 1. The subframe to which the second time slot belongs is an nth subframe after the first subframe, and n is a predetermined positive integer; or the second time slot is indicated by the first signaling display. And the subframe to which the second time slot belongs is not reserved for the uplink RS by high-layer signaling. The second carrier is deployed in a licensed spectrum. The second time slot is the last wideband symbol of the sub-frame scheduled by the first signaling
As sub-embodiment 1 of embodiment 3, the pattern of the SRS in the wideband symbol and the RS sequence of the SRS are reused in the pattern of the uplink RS in the wideband symbol triggered by the first signaling.
As sub-embodiment 2 of embodiment 3, the subframe to which the second slot belongs is a subframe other than the SRS subframe configured by the base station through the higher layer signaling. The SRS subframes comprise subframes for transmitting Type 0SRS and subframes for transmitting Type 1 SRS.
As sub-embodiment 3 of embodiment 3, a first slot and a second slot belong to the same subframe, a start time of the first slot is a start time of the subframe, and an end time of the second slot is an end time of the subframe, as shown in a third subframe timing of fig. 3.
Example 4
Embodiment 4 illustrates a structure diagram of an uplink RS, as shown in fig. 4. In fig. 4, the squares marked by the reverse oblique lines are the second time slots described in this application, the squares marked by the cross lines are the REs (Resource elements) occupied by the first RS described in this application, #1 to # K1 represent K1 wideband symbols described in this application, and K1 is greater than 1.
In embodiment 4, the pattern of the first RS within the wideband symbol reuses the SRS pattern within the wideband symbol and the SRS sequence of the SRS (i.e., the first RS is exactly equal to the SRS within the wideband symbol). The first RS expands the mapping in the symbol to the symbol in OCC mannerK1 wideband symbols, i.e. the first RS is multiplied by w by the given SRS1，…，wK1Are mapped to wideband symbols # 1- # K1, respectively, where w1，…，wK1Is an OCC sequence.
On the basis of the traditional code division multiplexing and frequency division multiplexing of the SRS, the number of supported uplink RSs can be further increased by a plurality of mutually orthogonal OCC sequences, and the requirement of uplink CSI reporting is met.
Example 5
Embodiment 5 illustrates a structure diagram of the first signaling, as shown in fig. 5. In fig. 5, the first signaling includes L1 information bit groups G (1) -G (L1), where 1 information bit group can trigger uplink RS transmission of one UE. Each of the information bit groups includes L2 bits, the L1 is a positive integer greater than 1, and the L2 is a positive integer. And the base station configures the position of the information bit group corresponding to the target UE in the first signaling through high-level signaling.
As sub-example 1 of example 5, the L2 is 1.
As sub-embodiment 2 of embodiment 5, the Payload Size (Payload Size, i.e., the number of information bits) of the first signaling is equal to the Payload Size of the DCI format 1C on the transmission carrier of the first signaling in the CSS on the PDCCH.
Example 6
Embodiment 6 is a block diagram illustrating a processing apparatus in a UE, as shown in fig. 6. In fig. 6, the processing device 200 is composed of a receiving module 201 and a transmitting module 202.
The receiving module 201 is configured to receive a first signaling in a first subframe, where the first signaling triggers transmission of an uplink RS on a first carrier. The sending module 202 is configured to perform a sensing operation on a first timeslot of a first carrier to determine whether to send an uplink RS. And if the uplink RS is determined to be transmitted, transmitting the first RS in the second time slot on the first carrier, otherwise, keeping the zero transmission power in the second time slot on the first carrier.
In embodiment 6, the first signaling is physical layer signaling, and the first carrier is deployed in an unlicensed spectrum. The first RS occupies K1 wideband symbols in the time domain, where K1 is a positive integer. The subframe to which the second time slot belongs is an nth subframe after the first subframe, and n is a predetermined positive integer; or the second time slot is indicated by the first signaling display. And the subframe to which the second time slot belongs is not reserved for the uplink RS by high-layer signaling.
As sub embodiment 1 of embodiment 6, the receiving module 201 is further configured to at least one of:
receiving the second signaling determines the position of the given information bit group in the L1 information bit groups.
Receiving third signaling to determine said K1, the third signaling being higher layer signaling.
Wherein the first signaling comprises the L1 information bit groups, and the given information bit group triggers the transmission of the uplink RS of the UE. Each of the information bit groups includes L2 bits, the L1 is a positive integer greater than 1, the L2 is a positive integer, and the second signaling is higher layer signaling.
As sub-embodiment 2 of embodiment 6, the sending module 202 is further configured to determine whether to send uplink physical layer data according to the listening operation, and if it is determined to send the uplink physical layer data, send the first physical layer data in a time interval between a first time slot and a second time slot on a first carrier, otherwise, keep zero sending power in the time interval. The first signaling is DCI for scheduling uplink physical layer data, K1 is 1, and the second slot is the last wideband symbol of the subframe scheduled by the first signaling. And the subframe to which the second time slot belongs is a subframe except the SRS subframe configured by the base station through high-layer signaling.
As sub-embodiment 4 of embodiment 6, the payload size of the first signaling is equal to the number of bits of DCI format 3 on the transmission carrier used for the first signaling.
Example 7
Embodiment 7 illustrates a block diagram of a processing apparatus in a base station, as shown in fig. 7. In fig. 7, the processing device 300 is composed of a transmitting module 301 and a receiving module 302.
The sending module 301 is configured to send a first signaling in a first subframe, where the first signaling triggers transmission of an uplink RS on a first carrier. The receiving module 302 is configured to detect an uplink RS triggered by the first signaling on a second timeslot of the first carrier, where the first RS corresponds to the first UE.
In embodiment 7, the first signaling is physical layer signaling, and the first carrier is deployed in an unlicensed spectrum. The first RS occupies K1 wideband symbols in the time domain, where K1 is a positive integer. The subframe to which the second time slot belongs is an nth subframe after the first subframe, and n is a predetermined positive integer; or the second time slot is indicated by the first signaling display. And the subframe to which the second time slot belongs is not reserved for the uplink RS by high-layer signaling.
As sub-embodiment 1 of embodiment 7, the sending module 301 is further configured to at least one of:
sending a second signaling indicating the location of the uplink RS scheduling information bit group of each UE in the target UE group in the L1 information bit groups.
Sending a third signaling indicating said K1, the third signaling being higher layer signaling.
Wherein the second signaling indicates a position of a given information bit group in L1 information bit groups, the target UE group includes at least a first UE, the target UE group includes at most L1 UEs, the first signaling includes the L1 information bit group, and the given information bit group triggers transmission of an uplink RS of the first UE. Each of the information bit groups includes L2 bits, the L1 is a positive integer greater than 1, the L2 is a positive integer, and the second signaling is higher layer signaling.
As sub-embodiment 2 of embodiment 7, the receiving module 302 is further configured to detect first physical layer data in a time interval between a first time slot and a second time slot on a first carrier, where the first physical layer data corresponds to the first UE. The first signaling is DCI for scheduling uplink physical layer data, K1 is 1, and the second slot is the last wideband symbol of the subframe scheduled by the first signaling. And the subframe to which the second time slot belongs is a subframe except the SRS subframe configured by the base station through high-layer signaling.
As sub-embodiment 4 of embodiment 7, the payload size of the first signaling is equal to the number of bits of DCI format 1C on the transmission carrier used for the first signaling.
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 application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (32)
1. A method in a UE for unlicensed spectrum communication, comprising the steps of:
-step a. receiving a first signaling in a first subframe, the first signaling triggering transmission of an uplink RS on a first carrier;
step b. performing a listening operation on a first slot of a first carrier to determine whether to transmit an uplink RS; if the uplink RS is determined to be sent, sending the first RS at a second time slot on the first carrier, otherwise, keeping zero sending power at the second time slot on the first carrier;
wherein the first signaling is physical layer signaling, and the first carrier is deployed in an unlicensed spectrum; the first RS occupies K1 wideband symbols in time domain, the K1 is a positive integer; the subframe to which the second time slot belongs is an nth subframe after the first subframe, and n is a predetermined positive integer; the subframe to which the second time slot belongs is not reserved for the uplink RS by a high-level signaling; the uplink RS is an SRS.
2. The method of claim 1, wherein step a further comprises the steps of:
-step A0. receiving the second signaling to determine the position of a given information bit group in the L1 information bit groups;
wherein the first signaling comprises the L1 information bit groups, and the given information bit group triggers the transmission of an uplink RS of the UE; each of the information bit groups comprises L2 bits, the L1 is a positive integer greater than 1, the L2 is a positive integer, and the second signaling is higher layer signaling; the first signaling is marked by a cell-common RNTI (radio network temporary identity) and is located in a common search space of a physical downlink control channel, or each of the L1 information bit groups can trigger uplink RS transmission of one UE.
3. The method of claim 1, wherein step B further comprises the steps of:
-step B0. determining whether to transmit uplink physical layer data based on the sensing operation, and if it is determined to transmit uplink physical layer data, transmitting the first physical layer data in a time interval between a first time slot and a second time slot on a first carrier, otherwise maintaining zero transmit power in the time interval;
the first signaling is DCI for scheduling uplink physical layer data, K1 is 1, and the second slot is the last wideband symbol of the subframe scheduled by the first signaling.
4. The method according to any one of claims 1 to 3, wherein the step A further comprises the steps of:
-step a1. receiving a third signaling to determine said K1, the third signaling being a higher layer signaling
Wherein the K1 wideband symbols are consecutive, and the position of the second slot in the subframe is configured by higher layer signaling.
5. The method according to any of claims 1 to 3, wherein the first carrier is configured by the base station as normal CP (cyclic prefix), the duration of the wideband symbol is 2208Ts or 2192Ts, said Ts is 1/30720 milliseconds.
6. The method of claim 4, wherein the first carrier is configured by the base station as normal CP (cyclic prefix), wherein the duration of the wideband symbol is 2208Ts or 2192Ts, and wherein the Ts is 1/30720 milliseconds.
7. The method of claim 4, wherein said K1 is one of 1, 2, 4, and 8; alternatively, the K1 is greater than 1, and the first RS spreads the intra-symbol mapping over the K1 wideband symbols in an OCC manner.
8. The method of claim 6, wherein said K1 is one of 1, 2, 4, and 8; alternatively, the K1 is greater than 1, and the first RS spreads the intra-symbol mapping over the K1 wideband symbols in an OCC manner.
9. A method in a base station for unlicensed spectrum communication, comprising the steps of:
step a. sending a first signaling in a first subframe, the first signaling triggering transmission of an uplink RS on a first carrier;
detecting an uplink RS triggered by the first signaling on a second time slot of the first carrier, wherein the first RS corresponds to the first UE;
wherein the first signaling is physical layer signaling, and the first carrier is deployed in an unlicensed spectrum; the first RS occupies K1 wideband symbols in time domain, the K1 is a positive integer; the subframe to which the second time slot belongs is an nth subframe after the first subframe, and n is a predetermined positive integer; the subframe to which the second time slot belongs is not reserved for the uplink RS by a high-level signaling; the uplink RS is an SRS.
10. The method of claim 9, wherein step a further comprises the steps of:
-step A0. transmitting second signaling indicating the position of the uplink RS scheduling information bit group of each UE in the target UE group in the L1 information bit groups;
wherein the second signaling indicates a position of a given information bit group in L1 information bit groups, the target UE group includes at least a first UE, the target UE group includes at most L1 UEs, the first signaling includes the L1 information bit groups, and the given information bit group triggers transmission of an uplink RS of the first UE; each of the information bit groups comprises L2 bits, the L1 is a positive integer greater than 1, the L2 is a positive integer, and the second signaling is higher layer signaling; the first signaling is marked by a cell-common RNTI (radio network temporary identity) and is located in a common search space of a physical downlink control channel, or each of the L1 information bit groups can trigger uplink RS transmission of one UE.
11. The method of claim 9, wherein step B further comprises the steps of:
-step B0. detecting first physical layer data in a time interval between a first time slot and a second time slot on a first carrier, the first physical layer data corresponding to a first UE;
the first signaling is DCI for scheduling uplink physical layer data, K1 is 1, and the second slot is the last wideband symbol of the subframe scheduled by the first signaling.
12. The method according to any one of claims 9 to 11, wherein said step a further comprises the steps of:
-a step a1. sending a third signaling indicating said K1, the third signaling being higher layer signaling;
wherein the K1 wideband symbols are consecutive, and the position of the second slot in the subframe is configured by higher layer signaling.
13. The method according to any of claims 9 to 11, wherein the first carrier is configured by the base station as normal CP (cyclic prefix), wherein the duration of the wideband symbol is 2208Ts or 2192Ts, wherein the Ts is 1/30720 ms.
14. The method of claim 12, wherein the first carrier is configured by the base station as normal CP (cyclic prefix), wherein the duration of the wideband symbol is 2208Ts or 2192Ts, and wherein the Ts is 1/30720 ms.
15. The method of claim 12, wherein K1 is one of 1, 2, 4, and 8; alternatively, the K1 is greater than 1, and the first RS spreads the intra-symbol mapping over the K1 wideband symbols in an OCC manner.
16. The method of claim 14, wherein K1 is one of 1, 2, 4, and 8; alternatively, the K1 is greater than 1, and the first RS spreads the intra-symbol mapping over the K1 wideband symbols in an OCC manner.
17. A user device for communicating over an unlicensed spectrum, the device comprising:
a first module: the first signaling is used for receiving first signaling in a first subframe, and the first signaling triggers the transmission of an uplink RS on a first carrier;
a second module: the device comprises a first receiver and a second receiver, wherein the first receiver is used for carrying out a sensing operation on a first time slot of a first carrier to determine whether to transmit an uplink RS or not; if the uplink RS is determined to be sent, sending the first RS at a second time slot on the first carrier, otherwise, keeping zero sending power at the second time slot on the first carrier;
wherein the first signaling is physical layer signaling, and the first carrier is deployed in an unlicensed spectrum; the first RS occupies K1 wideband symbols in time domain, the K1 is a positive integer; the subframe to which the second time slot belongs is an nth subframe after the first subframe, and n is a predetermined positive integer; the subframe to which the second time slot belongs is not reserved for the uplink RS by a high-level signaling; the uplink RS is an SRS.
18. The user equipment of claim 17, wherein the first module is further configured to:
receiving second signaling to determine the location of a given group of information bits in the L1 groups of information bits;
wherein the first signaling comprises the L1 information bit groups, and the given information bit group triggers the transmission of an uplink RS of the user equipment; each of the information bit groups comprises L2 bits, the L1 is a positive integer greater than 1, the L2 is a positive integer, and the second signaling is higher layer signaling; the first signaling is marked by a cell-common RNTI (radio network temporary identity) and is located in a common search space of a physical downlink control channel, or each of the L1 information bit groups can trigger uplink RS transmission of one UE.
19. The user equipment of claim 17, wherein the second module is further configured to: determining whether to send uplink physical layer data according to the interception operation, if the uplink physical layer data is determined to be sent, sending the first physical layer data in a time interval between a first time slot and a second time slot on a first carrier, otherwise, keeping zero sending power in the time interval;
the first signaling is DCI for scheduling uplink physical layer data, K1 is 1, and the second slot is the last wideband symbol of the subframe scheduled by the first signaling.
20. The user equipment according to any of claims 17 to 19, wherein the first module is further configured to:
-determining said K1 by receiving third signaling, the third signaling being higher layer signaling;
wherein the K1 wideband symbols are consecutive, and the position of the second slot in the subframe is configured by higher layer signaling.
21. The user equipment according to any of claims 17-19, wherein the first carrier is configured by the base station as normal CP (cyclic prefix), wherein the duration of the wideband symbol is 2208Ts or 2192Ts, and wherein the Ts is 1/30720 ms.
22. The UE of claim 20, wherein the first carrier is configured by the base station as a normal CP (cyclic prefix), wherein the duration of the wideband symbol is 2208Ts or 2192Ts, and wherein the Ts is 1/30720 ms.
23. The user equipment as recited in claim 20 wherein K1 is one of 1, 2, 4, and 8; alternatively, the K1 is greater than 1, and the first RS spreads the intra-symbol mapping over the K1 wideband symbols in an OCC manner.
24. The user equipment as recited in claim 22 wherein K1 is one of 1, 2, 4, and 8; alternatively, the K1 is greater than 1, and the first RS spreads the intra-symbol mapping over the K1 wideband symbols in an OCC manner.
25. A base station device for communicating in unlicensed spectrum, the device comprising:
a first module: the first signaling is used for sending a first signaling in a first subframe, and the first signaling triggers the transmission of an uplink RS on a first carrier;
a second module: the uplink RS triggered by the first signaling is detected on a second time slot of the first carrier, wherein the first RS corresponds to the first UE;
wherein the first signaling is physical layer signaling, and the first carrier is deployed in an unlicensed spectrum; the first RS occupies K1 wideband symbols in time domain, the K1 is a positive integer; the subframe to which the second time slot belongs is an nth subframe after the first subframe, and n is a predetermined positive integer; the subframe to which the second time slot belongs is not reserved for the uplink RS by a high-level signaling; the uplink RS is an SRS.
26. The base station device of claim 25, wherein the first module is further configured to:
sending a second signaling indicating the position of the uplink RS scheduling information bit group of each UE in the target UE group in L1 information bit groups;
wherein the second signaling indicates a position of a given information bit group in L1 information bit groups, the target UE group includes at least a first UE, the target UE group includes at most L1 UEs, the first signaling includes the L1 information bit groups, and the given information bit group triggers transmission of an uplink RS of the first UE; each of the information bit groups comprises L2 bits, the L1 is a positive integer greater than 1, the L2 is a positive integer, and the second signaling is higher layer signaling; the first signaling is marked by a cell-common RNTI (radio network temporary identity) and is located in a common search space of a physical downlink control channel, or each of the L1 information bit groups can trigger uplink RS transmission of one UE.
27. The base station device of claim 25, wherein the second module is further configured to: detecting first physical layer data in a time interval between a first time slot and a second time slot on a first carrier, the first physical layer data corresponding to a first UE;
the first signaling is DCI for scheduling uplink physical layer data, K1 is 1, and the second slot is the last wideband symbol of the subframe scheduled by the first signaling.
28. The base station device according to any of claims 25 to 27, wherein said first module is further configured to:
-sending a third signaling indication said K1, the third signaling being higher layer signaling;
wherein the K1 wideband symbols are consecutive, and the position of the second slot in the subframe is configured by higher layer signaling.
29. The base station device according to any of claims 25 to 27, wherein the first carrier is configured by the base station as normal CP (cyclic prefix), wherein the duration of the wideband symbol is 2208Ts or 2192Ts, wherein said Ts is 1/30720 ms.
30. The base station apparatus of claim 28, wherein the first carrier is configured by the base station as a normal CP (cyclic prefix), wherein the duration of the wideband symbol is 2208Ts or 2192Ts, and wherein the Ts is 1/30720 ms.
31. The base station apparatus of claim 28, wherein the K1 is one of 1, 2, 4, and 8; alternatively, the K1 is greater than 1, and the first RS spreads the intra-symbol mapping over the K1 wideband symbols in an OCC manner.
32. The base station apparatus of claim 30, wherein the K1 is one of 1, 2, 4, and 8; alternatively, the K1 is greater than 1, and the first RS spreads the intra-symbol mapping over the K1 wideband symbols in an OCC manner.
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