WO2016029851A1 - 用于支持非授权频谱上的通信的方法以及相应的基站和用户设备 - Google Patents
用于支持非授权频谱上的通信的方法以及相应的基站和用户设备 Download PDFInfo
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- WO2016029851A1 WO2016029851A1 PCT/CN2015/088125 CN2015088125W WO2016029851A1 WO 2016029851 A1 WO2016029851 A1 WO 2016029851A1 CN 2015088125 W CN2015088125 W CN 2015088125W WO 2016029851 A1 WO2016029851 A1 WO 2016029851A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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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
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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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
- H04L5/0058—Allocation criteria
- H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
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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
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
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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
- H04L5/0057—Physical resource allocation for CQI
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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
Definitions
- the present invention relates to the field of wireless communication technologies. More specifically, the present invention relates to methods for supporting communications over unlicensed spectrum and corresponding base stations and user equipment.
- Modern wireless mobile communication systems present two distinctive features.
- One is broadband high speed.
- the fourth generation wireless mobile communication system has a bandwidth of up to 100 MHz and a downlink rate of up to 1 Gbps.
- the second is mobile internet, which promotes mobile Internet access and mobile video on demand. , emerging services such as online navigation.
- These two characteristics put forward high requirements for wireless mobile communication technology, including: ultra-high-rate wireless transmission, inter-region interference suppression, reliable transmission of signals in mobile, distributed/centralized signal processing, and so on.
- 4G fourth generation
- 5G fifth generation
- the 3GPP RAN#62 plenary session discussed a new research topic (RP-132085), the study of unlicensed bands/carriers, known as LTE-U (LTE-Unlicensed, LTE on unlicensed carriers). transmission).
- LTE-U LTE-Unlicensed, LTE on unlicensed carriers.
- the main purpose is to investigate the use of non-standalone deployment of LTE over unlicensed spectrum, where non-independent means that communication on the unlicensed spectrum is associated with the serving cell on the licensed spectrum.
- a direct method is to use the carrier aggregation (CA) in the LTE system to deploy the licensed spectrum as the primary component carrier (PCC) of the serving base station and deploy the unlicensed spectrum as the secondary of the serving base station.
- SCC Secondary component carrier
- LTE Long Term Evolution
- Wi-Fi wireless local area network
- the LTE system needs to introduce a mechanism to avoid interference, so that the unlicensed spectrum is dynamically and opportunistically shared with systems such as Wi-Fi.
- Dynamic sharing requires the LTE system to quickly use unlicensed spectrum and complete communications.
- Opportunity sharing requires the LTE system to detect the idleness of the unlicensed spectrum without causing significant interference to existing systems. Under the premise, use and release the unlicensed spectrum in time after use. However, current LTE systems are unable to use spectrum resources dynamically and opportunistically.
- the bandwidth of the unlicensed spectrum (up to 500 MHz) may be much larger than the maximum bandwidth (100 MHz) supported by the LTE system. Therefore, an enhanced cross-carrier scheduling method and corresponding configuration method are needed for user equipments using unlicensed spectrum.
- uplink communication may not be considered.
- the present invention proposes a method for supporting communication over an unlicensed spectrum and corresponding base stations and user equipment.
- a method for supporting communication over an unlicensed spectrum performed by a base station, comprising the step of the base station transmitting an unauthorised-cell discovery reference signal U-DRS on an unlicensed carrier.
- the method may further include: the base station transmitting a reference signal for measuring channel state information CSI on the unlicensed carrier.
- the method may further include: the base station transmitting the downlink data to the user equipment on the unlicensed carrier.
- the method may further include: the base station configuring, to the user equipment, an unlicensed carrier for the user equipment to monitor the U-DRS.
- the method may further include: the base station configuring, to the user equipment, an unlicensed carrier for the user equipment to measure CSI and receive downlink data.
- a part of the unlicensed carrier may be selected from the unlicensed carrier for monitoring the U-DRS by the user equipment as an unlicensed carrier for the user equipment to measure the CSI and receive the downlink data, or may be used for monitoring the U-DRS by the user equipment.
- the unlicensed carrier acts as an unlicensed carrier for the user equipment to measure CSI and receive downlink data.
- the U-DRS may include at least a part of the channel state information reference signal CSI-RS or a part of the common reference signal CRS.
- the U-DRS may be sent at a lower power than the downlink data or the transmit power of the reference signal on the licensed carrier.
- the method may further include: the base station configuring, to the user equipment, a signal energy density ratio, where the signal energy density ratio is a ratio of an energy density of the downlink data to an energy density of the CSI-RS or CRS or The ratio of the energy density of the CSI-RS or CRS on the licensed carrier to the energy density of the CSI-RS or CRS.
- the signal energy density ratio may be configured by CC-specific and/or UE-specific radio resource control RRC signaling.
- the method may further include: the base station configuring, to the user equipment, a signal energy value, where the signal energy value is an energy value of the CSI-RS or CRS.
- the signal energy value may be configured by CC-specific and/or UE-specific radio resource control RRC signaling.
- the signal energy density ratio ranges from a non-negative decibel dB value.
- the information element "SCellIndex" existing in the LTE RRC signaling may be used to indicate the short ID of the authorized carrier and the unlicensed carrier.
- the detailed configuration of the unlicensed carrier may be indicated by the information element "SCellToAddMod-r10" existing in the modified LTE RRC signaling, and the modification may include: increasing the frequency information of the unlicensed carrier.
- the newly defined information unit "U-SCellIndex” may be used to indicate the short ID of the unlicensed carrier, and each "U-SCellIndex” is linked with a virtual "SCellIndex".
- the detailed configuration of the unlicensed carrier may include at least: a short ID of the unlicensed carrier indicated by the “U-SCellIndex”, a virtual “SCellIndex”, and frequency information of the unlicensed carrier.
- the virtual SCellIndex may be in the range of [N, 8], where N is an integer greater than 0 and less than 8.
- the information element "SCellIndex" existing in the LTE RRC signaling may be used to indicate the short ID of the authorized carrier and the unlicensed carrier.
- the detailed configuration of the unlicensed carrier may be indicated by the information element "SCellToAddMod-r10" existing in the modified LTE RRC signaling, and the modification may include: adding a carrier type flag to indicate that a certain "SCellIndex" corresponds to An authorized carrier is also an unlicensed carrier; and/or when the carrier type flag indicates an unlicensed carrier, a list information is added for carrying a configuration of a set of candidate unlicensed carriers.
- the information element “SCellToAddMod-r10” existing in the LTE RRC signaling may be used to configure the corresponding authorized carrier.
- the configuration of the set of candidate unlicensed carriers may include at least: one candidate The sub-index number sequence "U-SCellSubIndex" of the unlicensed carrier and the frequency information of the corresponding unlicensed carrier are selected.
- the uplink configuration of the unlicensed carrier can be removed.
- the unlicensed carrier for the user equipment to measure CSI and receive downlink data may be indicated to adopt cross-carrier scheduling.
- the cross-carrier scheduling may be adopted for the unlicensed carrier for measuring the CSI and receiving the downlink data for the user equipment by using the “CrossCarrier SchedulingConfig” information unit existing in the LTE RRC signaling.
- the unlicensed carrier for the user equipment to measure the CSI and receive the downlink data may be indicated as having no downlink control channel.
- the method may further include the step of: the base station transmitting cross-carrier scheduling information to the user equipment on the authorized carrier.
- the downlink data may be transmitted on an unlicensed carrier indicated by the cross-carrier scheduling information.
- the "SCellIndex" of the unlicensed carrier may be carried by the CIF in the DCI of the authorized carrier, thereby indicating that the unlicensed carrier is being scheduled across carriers.
- the reserved state of the CIF in the DCI of the authorized carrier may be used to indicate that the current downlink scheduling is cross-carrier scheduling for the unlicensed carrier, and uses several bits of other domains in the DCI and/or defined in the DCI. A number of new bits carry a "U-SCellIndex" message indicating which unlicensed carrier the current downlink schedule is for.
- SCellIndex may be defined as representing an unlicensed carrier, so that the CIF in the DCI of the authorized carrier may be set to these “SCellIndex” to indicate that the current downlink scheduling is for the non-represented by “SCellIndex”.
- Cross-carrier scheduling of the licensed carrier and may use a number of bits of other domains in the DCI and/or define a number of new bits in the DCI to carry a "U-SCellSubIndex" information, indicating that the current downlink scheduling is for "SCellIndex" Which of the unlicensed carriers represented is not.
- bits of other domains in the DCI may be "HARQ process number” and/or “Downlink Assignment Index” in the DCI.
- the downlink control channel may not be configured on the unlicensed carrier.
- the method may further include: receiving, by the base station, a monitoring report of the unlicensed carrier fed back by the user equipment; receiving, by the base station, a CSI report fed back by the user equipment; and receiving, by the base station, the user Confirmation of whether the downlink data transmission fed back by the device is successful.
- a method for supporting communication over an unlicensed spectrum performed by a user equipment, comprising the step of the user equipment receiving a U-DRS transmitted by a base station on an unlicensed carrier.
- the method may further include: the user equipment receives, on the unlicensed carrier, a reference signal sent by the base station for measuring channel state information CSI.
- the method may further include: the user equipment receives the downlink data sent by the base station on the unlicensed carrier.
- the method may further include: the user equipment feeds back, to the base station, confirmation information that the downlink data transmission is successful.
- the method may further include: the user equipment receiving, on the authorized carrier, a configuration of an unlicensed carrier for monitoring the U-DRS.
- the method may further include: the user equipment receives, on the authorized carrier, a configuration of an unlicensed carrier used for measuring CSI and receiving downlink data.
- unlicensed carriers may be selected from unlicensed carriers for monitoring U-DRS as unlicensed carriers for measuring CSI and receiving downlink data, or all unlicensed carriers for monitoring U-DRS may be employed.
- unlicensed carrier for measuring CSI and receiving downlink data As an unlicensed carrier for measuring CSI and receiving downlink data.
- the method may further include: the user equipment monitors the U-DRS on the unlicensed carrier configured by the base station for monitoring the U-DRS and feeds back the monitoring report to the base station; and the user equipment is configured at the base station
- the CSI is measured and fed back on the unlicensed carrier that measures the CSI and receives the downlink data.
- the method may further include: the user equipment receives the cross-carrier scheduling information on the authorized carrier.
- the downlink data may be received on an unlicensed carrier indicated by the cross-carrier scheduling information.
- a base station comprising: a transmitting unit, configured to send a U-DRS on an unlicensed carrier.
- the sending unit may further send a reference signal for measuring CSI on the unlicensed carrier.
- the sending unit may further send the downlink to the user equipment on the unlicensed carrier. data.
- the base station may further include: a configuration unit, configured to generate a first unlicensed carrier configuration, where the first unlicensed carrier is configured to configure an unlicensed carrier for the user equipment to monitor the U-DRS.
- the sending unit may be further configured to send the first unlicensed carrier configuration on the authorized carrier.
- the base station may further include: a configuration unit, where the user generates a second unlicensed configuration, where the second unlicensed carrier is configured to configure an unlicensed carrier for the user equipment to measure CSI and receive downlink data.
- the sending unit may be further configured to send a second unlicensed carrier configuration on the authorized carrier.
- a part of the unlicensed carrier may be selected from the unlicensed carrier for monitoring the U-DRS by the user equipment as an unlicensed carrier for the user equipment to measure the CSI and receive the downlink data, or may be used for monitoring the U-DRS by the user equipment.
- the unlicensed carrier acts as an unlicensed carrier for the user equipment to measure CSI and receive downlink data.
- the base station may further include: a scheduling unit, configured to generate cross-carrier scheduling information.
- the transmitting unit may send the cross-carrier scheduling information on an authorized carrier, and the downlink data may be transmitted on an unlicensed carrier indicated by the cross-carrier scheduling information.
- the base station may further include: a receiving unit, configured to receive a monitoring report of the unlicensed carrier fed back by the user equipment, a CSI report fed back by the user equipment, and confirmation information about whether the downlink data transmission fed back by the user equipment is successful.
- a receiving unit configured to receive a monitoring report of the unlicensed carrier fed back by the user equipment, a CSI report fed back by the user equipment, and confirmation information about whether the downlink data transmission fed back by the user equipment is successful.
- a user equipment comprising: a receiving unit, configured to receive a U-DRS on an unlicensed carrier.
- the receiving unit is further configured to receive a reference signal for measuring CSI on an unlicensed carrier.
- the receiving unit is further configured to receive downlink data on an unlicensed carrier.
- the receiving unit is further configured to receive, on the authorized carrier, a configuration of an unlicensed carrier used for monitoring the U-DRS.
- the receiving unit is further configured to receive, on the authorized carrier, a configuration of an unlicensed carrier used for measuring CSI and receiving downlink transmission.
- a part of the unlicensed carriers may be selected from the unlicensed carriers used for monitoring the U-DRS as an unlicensed carrier for measuring CSI and receiving downlink data, or may be used. All unlicensed carriers of the U-DRS are monitored as unlicensed carriers for measuring CSI and receiving downlink data.
- the user equipment may further include a measurement unit and a sending unit.
- the measurement unit can be used to perform measurements on the U-DRS and generate measurement reports, as well as measure CSI and generate CSI reports.
- the sending unit may be configured to send a U-DRS based measurement report and send a CSI report.
- the receiving unit is further configured to receive cross-carrier scheduling information on the authorized carrier.
- the user equipment may further include: a data decoding unit, configured to decode cross-carrier scheduling information.
- the downlink data may be received on an unlicensed carrier indicated by the cross-carrier scheduling information.
- the data decoding unit is further configured to decode the downlink data, and generate acknowledgement information about whether the downlink data reception is successful.
- the sending unit may be further configured to feed back the confirmation information to the base station.
- Figure 1 shows a flow chart in accordance with one embodiment of the present invention
- FIG. 2 is a block diagram showing the structure of a base station according to an embodiment of the present invention.
- FIG. 3 shows a structural block diagram of a user equipment according to an embodiment of the present invention.
- FIG. 1 is a diagram of possible operations of a base station and user equipment for supporting communications over an unlicensed spectrum, in accordance with one embodiment of the present invention. As shown, the example embodiment includes the following steps.
- Step S105 The base station sends U-DRSs (Unlicensed-Discovery Reference Signals) to the user equipment on the unlicensed carrier.
- U-DRSs Unlicensed-Discovery Reference Signals
- the U-DRSs are always sent in the system (ie, even if other systems already exist).
- the U-DRS is a low power U-DRS.
- low power means that the transmission power of the U-DRSs is lower than that of a normal downlink transmission signal, such as a data signal.
- the use of U-DRSs is to synchronize the user equipment of the LTE-U and/or RRM (Radio Resource Management) and/or obtain coarse (and detailed) CSI (Channel State Information).
- the purpose of low-power transmission of U-DRSs is to reduce the interference of U-DRSs to other systems such as Wi-Fi.
- the base station may detect the presence of nearby Wi-Fi access points, such as by searching for a beacon signal of the Wi-Fi access point.
- the U-DRSs may at least contain (partial) CSI-RSs (CSI reference signals) or (partial) CRSs (common reference signals) in the LTE system. Accordingly, a signal energy density ratio needs to be defined.
- the signal energy density ratio is configured by CC-specific and/or UE-specific RRC (Radio Resource Control) signaling.
- the signal energy density ratio is an energy density density of an Energy Per Resource Element (EPRE) of the LTE-U data signal (PDSCH) and a CSI-RS or CRS.
- ERE Energy Per Resource Element
- said signal energy density ratio is a ratio of an energy density of a CSI-RS or CRS on the licensed carrier to an energy density of a CSI-RS or CRS on said unlicensed carrier.
- the signal energy is dense
- the range of values is a non-negative dB value (decibel, decibel).
- a signal energy value needs to be defined.
- the signal energy value is an energy value of the CSI-RS or CRS.
- the signal energy value is configured by CC-specific and/or UE-specific radio resource control RRC signaling.
- the technical effect of the UE-specific signal energy density ratio is that the base station can perform different downlink power control on different user equipments when performing LTE-U.
- step S105 the user equipment receives the U-DRS on the unlicensed carrier, thereby being able to discover the base station on the unlicensed carrier.
- step S105 provides basic support for communication over the unlicensed spectrum.
- Step S110 Optionally, the base station configures an unlicensed carrier to the user equipment for the user equipment to monitor the U-DRSs.
- the present invention proposes the following three methods based on RRC signaling.
- Method 1 The information element "SCellIndex" (see TS 36.331) existing in the current LTE system RRC signaling is used to indicate the short ID of the authorized carrier and the unlicensed carrier.
- the detailed unlicensed carrier configuration is similar to the existing information element "SCellToAddMod-r10" (see TS 36.331) in the LTE system RRC signaling, and the required changes are as follows (not limited to the following changes): increase non-authorization Carrier frequency information (frequency, bandwidth, etc.) and/or removal of the upstream configuration of the unlicensed carrier.
- the U-DRSs on the unlicensed carrier need to be configured, which may include the CC-specific and/or UE-specific power information set forth in step S105.
- the advantage of the method 1 is that it is simple, but its disadvantage is also obvious, that is, the user equipment of the LTE-U has only a limited opportunity to use the unlicensed carrier.
- This is mainly due to the fact that the "SCellIndex" in the current LTE system takes values from 1 to 7, and these extremely limited values need to be shared by the licensed carrier and the unlicensed carrier.
- this disadvantage can be overcome by increasing the value range of "SCellIndex", such as increasing the maximum value to 15.
- the allocation of the unlicensed carrier indicated by an "SCellIndex" Set the frequency information (frequency, bandwidth, etc.) of the unlicensed carrier, which is similar to the frequency band indication corresponding to dl-CarrierFreq in TS 36.331, and the corresponding frequency information corresponding to the frequency band indication is similar to TS 36.101.
- the E-UTRA Operating Band in 1 was obtained. What we need to point out here is that all similar tables here, 5.7.3-1, are tables for the new LTE-U pre-defined bands available on 5 GHz. For example, Table 1 shows.
- E-UTRA Unlicensed Operating Band Band range 1 5170-5190 2 5190-5210 3 5210-5230 4 5230-5250 5 5250-5270 6 5270-5290 7 5290-5310 8 5310-5330 9 5490-5510 10 5510-5530 11 5530-5550 12 5550-5570 13 5570-5590 14 5590-5610 15 5610-5630 16 5630-5650 17 5650-5670 18 5670-5690 19 5690-5710 20 5710-5730 twenty one 5735-5755 twenty two 5755-5775 twenty three 5775-5795
- the configuration of the CSI-RSs is taken as part of the configuration of the U-DRS.
- a CC-specific and/or UE-specific RRC parameter (such as writing P C or P D ) is defined as the energy density of PDSCH of LTE-U and the energy energy density of CSI-RS.
- one CC-specific and/or UE-specific RRC parameter is defined as the energy value of the CSI-RS in the U-DRS.
- the configuration of the CRSs is taken as part of the configuration of the U-DRS.
- a CC-specific and/or UE-specific RRC parameter (such as writing P C or P D ) is defined as the ratio of the energy density of the PDSCH of the LTE-U to the energy energy density of the CRSs. Or the ratio of the energy density of the CSI-RS or CRS on the licensed carrier to the energy density of the CRS. If a low power U-DRS is further employed, the signal energy density ratio ranges from a non-negative dB value.
- one CC-specific and/or UE-specific RRC parameter is defined as the energy value of the CRS in the U-DRS.
- Method 2 Define a new information element in LTE-U (such as writing "U-SCellIndex”).
- the "U-SCellIndex” takes an integer value and is used to indicate the short ID of the unlicensed carrier.
- each "U-SCellIndex” is linked with a virtual "SCellIndex".
- the so-called “virtual” means that the "SCellIndex” is an unlicensed carrier that is virtually configured to be indicated by the "U-SCellIndex", and the virtual “SCellIndex” may have been used by an authorized carrier or an unlicensed carrier. use.
- the virtual “SCellIndex” ranges from [N, 8], where N is an integer greater than 0 and less than 8.
- the configuration of the detailed unlicensed carrier may include or may include, for example, a short ID "U-SCellIndex" of the unlicensed carrier, a "SCellIndex” of the virtual configuration, and frequency information (frequency, bandwidth, etc.) of the unlicensed carrier. Further, in the configuration of the unlicensed carrier, it may be necessary to remove its uplink configuration.
- U-DRSs on the unlicensed carrier can be configured, which can include CC-specific and/or UE-specific power information as set forth in step S105.
- U-SCellIndex can be significantly greater than 7, so LTE-U user equipment may have the opportunity to use many unlicensed carriers compared to the licensed carrier.
- N generally takes a larger number, such as N>4.
- the normal communication operation on the authorized carrier should be preferentially guaranteed.
- a new information element (such as "U-SCellIndex-r13") is defined in LTE-U, and the value of the information element is a positive integer (1, 2, ..., 10).
- another information element "U-SCellToAddMod-r13” can be defined to carry its detailed configuration.
- the "U-SCellToAddMod-r13” may at least or may include a short ID of the unlicensed carrier, a "SCellIndex" of the virtual configuration, and frequency information (frequency, bandwidth, etc.) of the unlicensed carrier. Further, in the configuration of the unlicensed carrier, it may be necessary to remove its uplink configuration.
- U-SCellIndex-r13 8
- another new information unit is defined to be carried (for example, "virtualSCellIndex-r13").
- the frequency information of the unlicensed carrier is similar to the frequency band indication corresponding to dl-CarrierFreq in TS 36.331, and the corresponding exact frequency point information of the frequency band indication is obtained by the E-UTRA Operating Band in the same as TS 36.101 Table 5.7.3-1. What we need to point out here is that all similar tables here in 5.7.3-1 are pre-defined for LTE-U. A table of frequency bands available at 5 GHz. For example, it is shown in Table 1, but it is not limited to the case of Table 1.
- the configuration of the CSI-RSs can be taken as part of the configuration of the U-DRS.
- a CC-specific and/or UE-specific RRC parameter (such as writing P C or P D ) is defined as the energy density of PDSCH of LTE-U and the energy energy density of CSI-RS.
- one CC-specific and/or UE-specific RRC parameter is defined as the energy value of the CSI-RS in the U-DRS.
- the configuration of the CRSs is taken as part of the configuration of the U-DRS.
- a CC-specific and/or UE-specific RRC parameter (such as writing P C or P D ) is defined as the ratio of the energy density of the PDSCH of the LTE-U to the energy energy density of the CRSs. Or the ratio of the energy density of the CSI-RS or CRS on the licensed carrier to the energy density of the CRS. If a low power U-DRS is further employed, the signal energy density ratio ranges from a non-negative dB value.
- one CC-specific and/or UE-specific RRC parameter is defined as the energy value of the CRS in the U-DRS.
- Method 3 Use the information element "SCellIndex" (see TS 36.331) existing in the current LTE system RRC signaling to indicate the short ID of the authorized carrier and the unlicensed carrier.
- the configuration of the detailed unlicensed carrier is basically similar to the information element "SCellToAddMod-r10" (see TS 36.331) existing in the current LTE system RRC signaling, but major changes are required.
- the required changes are as follows (not limited to the following changes): adding a carrier type flag to indicate whether a certain "SCellIndex" corresponds to an authorized carrier or an unlicensed carrier, and/or when the carrier type flag indicates non- When the carrier is authorized, it is necessary to add a list information for carrying the configuration of a set of candidate unlicensed carriers.
- the configuration of the set of candidate unlicensed carriers may include or may include, for example, a sub-index number sequence of a candidate unlicensed carrier (such as "U-SCellSubIndex") and frequency information (frequency, bandwidth, etc.) of the corresponding unlicensed carrier. Further, in the configuration of the unlicensed carrier, it may be necessary to remove its uplink configuration.
- the carrier type flag indicates an authorized carrier
- the LTE system is adopted.
- the existing information unit "SCellToAddMod-r10" can be configured to configure the corresponding authorized carrier.
- U-DRSs on the unlicensed carrier can be configured, which can include CC-specific and/or UE-specific power information as set forth in step S105.
- SCellIndex used to indicate the unlicensed carrier may be more than one.
- the present invention does not require any limitation on the number.
- the set of candidate unlicensed carriers may contain only one unlicensed carrier.
- the present invention does not require any limitation on the number.
- the total number of candidate unlicensed carriers can be significantly greater than 7, so that LTE-U user equipment may have the opportunity to use many unlicensed carriers compared to licensed carriers.
- each candidate unlicensed carrier is linked with an "SCellIndex", which enables the LTE-U system to completely reuse the existing mechanism to determine on which resource the user equipment feedback is successfully received. Confirmation information.
- SCellType-r13 such as Boolean value
- SCellIndex 5
- a list of 4 candidate unlicensed carriers is configured, which contains at least one sub-index number sequence of candidate unlicensed carriers (such as "U-SCellSubIndex-r13") and corresponding non-authorization Carrier frequency information (frequency, bandwidth, etc.).
- Table 2 shows a related example.
- the frequency information of the candidate unlicensed carrier is similar to the frequency band indication corresponding to dl-CarrierFreq in TS 36.331, and the corresponding frequency point information corresponding to the frequency band indication is similar to that in TS 37.101, Table 5.7.3-1.
- E-UTRA Operating Band is available. What we need to point out here is that all similar tables here, 5.7.3-1, are tables for the new LTE-U pre-defined bands available on 5 GHz. For example, it is shown in Table 1, but it is not limited to the case of Table 1.
- Table 2 An example of a list of 4 candidate unlicensed carriers
- a list of 7 candidate unlicensed carriers is configured, which may at least or may contain a sub-index number sequence of candidate unlicensed carriers (such as "U-SCellSubIndex-r13") and Frequency information (frequency, bandwidth, etc.) of the corresponding unlicensed carrier.
- Table 3 shows a related example.
- the frequency information of the candidate unlicensed carrier is similar to the frequency band indication corresponding to dl-CarrierFreq in TS 36.331, and the corresponding frequency point information corresponding to the frequency band indication is similar to E-UTRA in Table 57.3-1 of Table 36.101. Operating Band is acquired. What we need to point out here is that all similar tables here, 5.7.3-1, are tables for the new LTE-U pre-defined bands available on 5 GHz. For example, Table 1 shows.
- Table 3 An example of a list of 7 candidate unlicensed carriers
- the configuration of the CSI-RSs can be taken as part of the configuration of the U-DRS.
- a CC-specific and/or UE-specific RRC parameter (such as writing P C or P D ) is defined as the energy density of PDSCH of LTE-U and the energy energy density of CSI-RS.
- one CC-specific and/or UE-specific RRC parameter is defined as the energy value of the CSI-RS in the U-DRS.
- the configuration of the CRSs is taken as part of the configuration of the U-DRS.
- a CC-specific and/or UE-specific RRC parameter (such as writing P C or P D ) is defined as the ratio of the energy density of the PDSCH of the LTE-U to the energy energy density of the CRSs. Or the ratio of the energy density of the CSI-RS or CRS on the licensed carrier to the energy density of the CRS. If a low power U-DRS is further employed, the signal energy density ratio ranges from a non-negative dB value.
- one CC-specific and/or UE-specific RRC parameter is defined as the energy value of the CRS in the U-DRS.
- Step S115 Optionally, the user equipment implements the measurement and feeds back the measurement report to the base station.
- the user equipment measures the U-DRSs on the unlicensed carrier configured in step S110, and feeds back the corresponding measurement report to the base station. It should be noted that measuring the reference signal and feeding back the measurement report is a standard procedure in the current LTE network, and the present invention does not impose any limiting requirements on the step.
- Step S120 the base station configures an unlicensed carrier for the user equipment to measure CSI (Channel State Information) and receive downlink transmission.
- CSI Channel State Information
- the unlicensed carrier set for the user equipment to measure the CSI and receive the downlink transmission may be a subset of the U-DRSs unlicensed carrier set (configuration of step S110) for the user equipment to monitor. That is, the base station may select a part of the unlicensed carrier from the configuration set of step S110 as the unlicensed carrier set for the user equipment to measure the CSI and receive the downlink transmission, or may directly adopt the configuration set of step S110 as the user equipment to measure the CSI and receive the downlink.
- the RRC signaling is required or can be configured for the user equipment to measure the CSI and receive the downlink transmission without authorization.
- Carrier set For selecting a part of the unlicensed carrier from the configuration set of step S110 as the unlicensed carrier set for the user equipment to measure the CSI and the downlink transmission, the RRC signaling is required or can be configured for the user equipment to measure the CSI and receive the downlink transmission without authorization. Carrier set.
- the detailed RRC signaling configuration is the same as that described in step S110, except that the number of unlicensed carriers is reduced, and details are not described herein.
- the unlicensed carrier set for the user equipment to measure the CSI and the downlink transmission is only required to be defined as the user equipment monitoring U.
- the DRSs are not the same set of unlicensed carriers, no additional operations are required.
- the configuration step may be omitted in the case where the user equipment uses the carriers in the U-DRS unlicensed carrier set configured by the base station to measure the CSI and receive the downlink transmission.
- the configuration may use the “CrossCarrierSchedulingConfig” information element existing in the current LTE system RRC signaling, in which the downlink scheduling information of the unlicensed carrier is configured to be always collected from the authorized carrier.
- step S110 It should be noted that the three methods proposed in step S110 are all applicable to step S120.
- Step S125 Optionally, the user equipment measures CSI on the configured unlicensed carrier and feeds back the corresponding CSI.
- the user equipment may receive the reference signal for measuring the channel state information CSI sent by the base station on the unlicensed carrier configured in step S120, measure the CSI, and feed back the corresponding CSI to the base station.
- the measurement and feedback CSI is a standard process in the current LTE network, and the present invention does not impose any limiting requirements on the step.
- Step S130 Optionally, the base station determines when and how to use the unlicensed carrier
- the base station In order for the LTE system to be able to share the resources of the unlicensed carrier fairly with other systems, such as Wi-Fi systems, the base station needs to intelligently decide when and how to use the unlicensed carrier. This is a step implemented internally by the base station, and the present invention does not impose any limiting requirements on this step.
- Step S135 Optionally, the base station transmits cross-carrier scheduling information on the authorized carrier, and transmits downlink data on the unlicensed carrier.
- the present invention proposes three types of DCI based (downlink control information, Line control information) method.
- the three methods are based on the three methods proposed in step S110 and step S120, respectively.
- the current DCI signaling of the LTE system can be directly used to schedule downlink transmission on the unlicensed carrier in the LTE-U system across carriers. More specifically, in the downlink cross-carrier scheduling DCI of the current LTE system, the DCI formats 1, 1A, 1B, 1D, 2, 2A, 2B, 2C all contain a 3-bit field for indicating a "SCellIndex", which The carrier corresponding to SCellIndex is the target carrier of the DCI scheduling.
- the 3-bit field may be referred to as a CIF (Carrier Indicator Field).
- the carrier corresponding to the "SCellIndex” may be an authorized carrier or an unlicensed carrier. This is because in Method 1, the value of "SCellIndex" needs to be shared between the authorized carrier and the unlicensed carrier.
- the other information in the DCI is the same as defined in the LTE system.
- the other information in the DCI is the same as defined in the LTE system.
- the advantage of adopting this method is that no new bits need to be added with respect to the existing DCI format, so that cross-carrier scheduling for unlicensed carriers can be realized without increasing overhead.
- Method 2 Based on Method 2 in Step S110 and Step S120, the base station uses the reserved state of the CIF, ie, 000 (and does not exclude any other specific value), indicating that the current downlink scheduling is for the unlicensed carrier, and uses other in the DCI.
- a number of bits of the field and/or a number of new bits are defined in the DCI to carry a "U-SCellIndex" information indicating which unlicensed carrier the current downlink scheduling is for.
- several bits of other domains in the DCI refer to "HARQ process number" (originally used for downlink retransmission) and/or "Downlink Assignment Index" (originally used for TDD system) in the DCI.
- DCI format 1, 1A, 1B, 1D, 2, 2A, 2B, 2C are all present.
- the other information in the DCI is the same as defined in the LTE system.
- the other information in the DCI is the same as defined in the LTE system.
- the advantage of adopting the method is that cross-carrier scheduling for unlicensed carriers can be implemented more succinctly, and the implementation complexity of the system is reduced. Moreover, in the case where the above preferred scheme is used, the system overhead is not increased.
- Method 3 Based on Method 3 in Step S110 and Step S120, some "SCellIndex" has been defined to represent an unlicensed carrier, and then the base station sets the CIF to these "SCellIndex" to indicate that the current downlink scheduling is for an unlicensed carrier. .
- the base station uses a number of bits of other domains in the DCI and/or defines a number of new bits in the DCI to carry a "U-SCellSubIndex" information, indicating which unlicensed carrier the current downlink scheduling is for.
- several bits of other domains in the DCI refer to "HARQ process number" (originally used for downlink retransmission) and/or "Downlink Assignment Index” (originally used for TDD system) in the DCI.
- DCI format 1, 1A, 1B, 1D, 2, 2A, 2B, 2C are all present.
- a set of 4 candidate unlicensed carriers (see Table 2).
- the other information in the DCI is the same as defined in the LTE system.
- the other information in the DCI is the same as defined in the LTE system.
- the other information in the DCI is the same as defined in the LTE system.
- the other information in the DCI is the same as defined in the LTE system.
- Step S140 Optionally, the user equipment receives cross-carrier scheduling information on the authorized carrier, and receives downlink data on the unlicensed carrier.
- the user equipment receives cross-carrier scheduling information on the authorized carrier and receives downlink data on the unlicensed carrier.
- a Physical Downlink Control Channel (PDCCH) region on an unlicensed carrier may be reduced to zero.
- the downlink control channel on the unlicensed carrier may be configured to be zero.
- the downlink control channel on the unlicensed carrier can be defined as zero in advance without additional signaling overhead.
- the domain "pdsch-Start" of the "CrossCarrierSchedulingConfig" information element may be set to 0.
- the starting OFDM symbol position of the PDSCH of the unlicensed carrier is predefined to be 0, and no signaling is required for configuration.
- Step S145 Optionally, the user equipment feeds back the confirmation information that the reception is successful.
- ACK/NAK feedback is a standard procedure in current LTE networks, and the present invention does not impose any limiting requirements on this step.
- FIG. 2 shows a block diagram of a structure of a base station 400 in accordance with one embodiment of the present invention.
- the base station 400 includes at least a transmitting unit 415 for transmitting a U-DRS on an unlicensed carrier.
- the base station 400 may further include a receiving unit 405, a configuration unit 410, and a scheduling unit 420.
- the receiving unit 405 can receive the measurement report of the unlicensed carrier from the user equipment, the CSI report, and the confirmation information of whether the downlink data reception is successful.
- the configuration unit 410 can configure an unlicensed carrier for the user equipment to monitor the U-DRSs, and configure the unlicensed carrier for the user equipment to measure the CSI and receive the downlink transmission.
- the sending unit 415 can also be configured to send a configuration of the unlicensed carrier on the authorized carrier for the user equipment to monitor the U-DRSs, and send the configuration of the unlicensed carrier on the authorized carrier for the user equipment to measure the CSI and receive the downlink transmission, and on the authorized carrier. Transmitting cross-carrier scheduling information and transmitting downlink data on unlicensed carriers.
- the scheduling unit 420 can decide when and how to use the unlicensed carrier and can generate cross-carrier scheduling information.
- FIG. 3 shows a structural block diagram of a user equipment according to an embodiment of the present invention.
- the user equipment 600 includes at least a receiving unit 605 for receiving a U-DRS on an unlicensed carrier.
- the user equipment 600 may further include: a measuring unit 610, a sending unit 615, and a data decoding unit 620.
- the receiving unit 605 can also receive the configuration of the unlicensed carrier on the authorized carrier for monitoring (low power) U-DRSs, and receiving the unlicensed carrier on the authorized carrier.
- the method is configured to measure CSI and receive downlink transmission, receive a reference signal for measuring CSI on an unlicensed carrier, receive cross-carrier scheduling information on the authorized carrier, and receive downlink data on the unlicensed carrier.
- Measurement unit 610 can perform measurements on (low power) U-DRSs and generate measurement reports, and measure CSI of unlicensed carriers and generate CSI reports.
- the transmitting unit 615 may send a measurement report based on the (low power) U-DRSs, send a CSI report of the unlicensed carrier, and send acknowledgement information indicating whether the downlink reception is successful.
- the data decoding unit 620 can decode the information of the cross-carrier scheduling, decode the downlink data, and generate confirmation information that the downlink reception is successful.
- the above-described embodiments of the present invention can be implemented by software, hardware, or a combination of both software and hardware.
- the base station and various components within the user equipment in the above embodiments may be implemented by various devices including, but not limited to, analog circuit devices, digital circuit devices, digital signal processing (DSP) circuits, and programmable processing. , Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), Programmable Logic Devices (CPLDs), and more.
- ASICs Application Specific Integrated Circuits
- FPGAs Field Programmable Gate Arrays
- CPLDs Programmable Logic Devices
- base station refers to a generalized wireless communication transmission node, such as a macro base station, a micro base station, a relay, etc., which at least includes functions of data reception and transmission.
- User equipment refers to a user mobile terminal, for example, a terminal device including a mobile phone, a notebook, etc., which can perform wireless communication with a base station or a micro base station.
- embodiments of the invention disclosed herein may be implemented on a computer program product.
- the computer program product is a product having a computer readable medium encoded with computer program logic that, when executed on a computing device, provides related operations to implement The above technical solution of the present invention.
- the computer program logic When executed on at least one processor of a computing system, the computer program logic causes the processor to perform the operations (methods) described in the embodiments of the present invention.
- Such an arrangement of the present invention is typically provided as software, code and/or other data structures, or such as one or more, that are arranged or encoded on a computer readable medium such as an optical medium (e.g., CD-ROM), floppy disk, or hard disk.
- Software or firmware or such a configuration may be installed on the computing device such that one or more processors in the computing device perform the technical solutions described in the embodiments of the present invention.
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Abstract
本申请公开了由基站执行的用于支持非授权频谱上的通信的方法以及所述基站。所述由基站执行的方法包括:基站在非授权载波上发送非授权-小区发现参考信号U-DRS。基站可以向用户设备配置供所述用户设备监测U-DRS的非授权载波。本方法还可以包括:基站在非授权载波上发送用于测量信道状态信息CSI的参考信号。基站可以向用户设备配置供所述用户设备测量CSI和接收下行数据的非授权载波。本方法还可以包括:基站在非授权载波上向用户设备发送下行数据。本申请还公开了与上述方法和基站相对应的由用户设备执行的方法和用户设备。
Description
本发明涉及无线通信技术领域。更具体地,本发明涉及用于支持非授权频谱上的通信的方法以及相应的基站和用户设备。
现代无线移动通信系统呈现出两个显著特点,一是宽带高速率,比如第四代无线移动通信系统的带宽可达100MHz,下行速率高达1Gbps;二是移动互联,推动了移动上网、手机视频点播、在线导航等新兴业务。这两个特点对无线移动通信技术提出了较高要求,主要有:超高速率无线传输、区域间干扰抑制、移动中可靠传输信号、分布式/集中式信号处理等等。在未来的增强第四代(4G)及第五代(5G)无线移动通信系统中,为了满足上述发展需求,各种相应的关键技术开始被提出和论证,值得本领域的研究人员广泛关注。
在2007年10月,国际电信联盟(ITU)批准全球微波互联接入系统(WiMax,Worldwide Interoperability for Microwave Access)成为第四个3G系统标准。这一发生在3G时代末期的事件,实际上是4G标准争夺战的预演。事实上,为了应对以无线局域网和WiMax为代表的无线IP技术流的挑战,从2005年开始,第三代3GPP组织就着手进行全新的系统升级,即长期演进系统(LTE,Long Term Evolution)的标准化工作。这是一个基于正交频分复用技术(OFDM,Orthogonal Frequency Division Multiplexing)的准四代系统,已于2009年初推出第一版,并在2010年陆续在全球开始商用。与此同时,3GPP组织关于第四代无线移动通信系统(4G,the Fourth Generation)的标准化制定工作也已经于2008年上半年启动,该系统称为先进的长期演进系统(LTE-A,Long Term Evolution Advanced)。该系统的物理层过程的关键标准化文书已于2011年初完成。在2011年11月ITU组织在中国重庆正式宣布,LTE-A系统和WiMax系统是4G系统的两个官方标准。目前,LTE-A系统的商用过程正在全球范围逐步展开。
根据未来十年的挑战,对于增强的第四代无线移动通信系统,大致有以下几点发展需求:
-更高的无线宽带速率,且重点优化局部的小区热点区域;
-进一步提高用户体验,特别需要优化小区边界区域的通信服务;
-考虑到可用频谱不可能有1000倍的扩展,故需要继续研究能够提高频谱利用效率的新技术;
-高频段的频谱(5GHz,甚至更高)必将投入使用,以获得较大的通信带宽;
-现有网络(2G/3G/4G,WLAN,WiMax等)的协同工作,以分担数据流量;
-针对不同业务、应用和服务特定优化;
-加强系统支持大规模机器通信的能力;
-灵活、智能且廉价的网络规划与布网;
-设计方案以节省网络的用电量和用户设备的电池消耗。
传统的3GPP LTE系统中,数据传输只能在授权频谱上(licensed bands/carriers),然而随着业务量的急剧增涨,尤其在一些城市的热点区域,授权频谱可能很难满足增涨的业务量的需求。3GPP RAN#62次全会讨论了一个新的研究课题(RP-132085),即非授权频谱(unlicensed bands/carriers)的研究,被称为LTE-U(LTE-Unlicensed,LTE在非授权载波上的传输)。主要目的是研究利用在非授权频谱上的LTE的非独立部署(non-standalone deployment),所谓非独立是指在非授权频谱上的通信要和授权频谱上的服务小区相关联。一个直接的方法是尽量沿用LTE系统中的载波聚合(carrier aggregation,CA)的方式,即将授权频谱部署为服务基站的主载波(primary component carrier,PCC),将非授权频谱部署为服务基站的辅载波(secondary component carrier,SCC)。
在传统的LTE系统中,要使用非授权频谱,会遇到如下几个问题:
-非授权频谱上还会存在其他接入技术对应的网络,如Wi-Fi的网络覆盖,LTE系统需要引入避免干扰的机制,从而与Wi-Fi等系统动态地,机遇性地共享非授权频谱。动态共享要求LTE系统能够快速使用非授权频谱并完成通信。机遇性共享要求LTE系统能够探测到非授权频谱的空闲情况,在不对已有系统造成很大干扰
的前提下,使用并在使用后及时释放非授权频谱。但是,目前的LTE系统无法做到动态地和机遇性地使用频谱资源。
-非授权频谱的带宽(最大可达500MHz)可能远大于LTE系统支持的最大带宽(100MHz),因此需要为使用非授权频谱的用户设备设计增强的跨载波调度方法及相应配置方法。
-非授权频谱上的通信以下行为主,在初期的LTE-U版本中,上行通信可能是不考虑的。
发明内容
针对以上问题,本发明提出了用于支持非授权频谱上的通信的方法以及相应的基站和用户设备。
根据本发明的第一方面,提供了一种由基站执行的用于支持非授权频谱上的通信的方法,包括以下步骤:基站在非授权载波上发送非授权-小区发现参考信号U-DRS。
可选地,所述方法还可以包括:基站在非授权载波上发送用于测量信道状态信息CSI的参考信号。
可选地,所述方法还可以包括:基站在非授权载波上向用户设备发送下行数据。
可选地,所述方法还可以包括:基站向用户设备配置供所述用户设备监测U-DRS的非授权载波。
可选地,所述方法还可以包括:基站向用户设备配置供所述用户设备测量CSI和接收下行数据的非授权载波。
可选地,可以从供用户设备监测U-DRS的非授权载波中选择一部分非授权载波作为供用户设备测量CSI和接收下行数据的非授权载波,或者可以采用供用户设备监测U-DRS的全部非授权载波作为供用户设备测量CSI和接收下行数据的非授权载波。
可选地,所述U-DRS可以至少含有一部分信道状态信息参考信号CSI-RS或者一部分公共参考信号CRS。
可选地,所述U-DRS可以是以比下行数据或授权载波上的参考信号的发送功率低的功率发送的。
可选地,所述方法还可以包括:基站向所述用户设备配置一个信号能量密度比值,所述信号能量密度比值是下行数据的能量密度与所述CSI-RS或CRS的能量密度之比或授权载波上的CSI-RS或CRS的能量密度与所述CSI-RS或CRS的能量密度之比。
可选地,所述信号能量密度比值可以通过CC-specific和/或UE-specific的无线资源控制RRC信令进行配置。
可选地,所述方法还可以包括:基站向所述用户设备配置一个信号能量值,所述信号能量值是所述CSI-RS或CRS的能量值。
可选地,所述信号能量值可以通过CC-specific和/或UE-specific的无线资源控制RRC信令进行配置。
可选地,所述信号能量密度比值的取值范围是非负的分贝dB值。
可选地,可以使用LTE RRC信令中已有的信息单元“SCellIndex”来指示授权载波和非授权载波的短ID。非授权载波的详细配置可以由修改后的LTE RRC信令中已有的信息单元“SCellToAddMod-r10”指示,所述修改可以包括:增加非授权载波的频率信息。
可选地,可以使用新定义的信息单元“U-SCellIndex”来指示非授权载波的短ID,每个“U-SCellIndex”与一个虚拟“SCellIndex”构成链接。非授权载波的详细配置可以至少包含:“U-SCellIndex”所指示的非授权载波的短ID、虚拟“SCellIndex”和非授权载波的频率信息。
可选地,该虚拟“SCellIndex”取值范围可以为[N,8],其中,N为大于0并小于8的整数。
可选地,可以使用LTE RRC信令中已有的信息单元“SCellIndex”来指示授权载波和非授权载波的短ID。非授权载波的详细配置可以由修改后的LTE RRC信令中已有的信息单元“SCellToAddMod-r10”指示,所述修改可以包括:增加一个载波类型标志位来指示某个“SCellIndex”对应的是一个授权载波还是一个非授权载波;和/或当所述载波类型标志位指示非授权载波时,增加一个列表信息用于承载一个候选非授权载波的集合的配置。
可选地,当载波类型标志位指示授权载波时,可以采用LTE RRC信令中已有的信息单元“SCellToAddMod-r10”来配置对应的授权载波。
可选地,所述候选非授权载波的集合的配置可以至少包含:一个候
选非授权载波的子索引号序列“U-SCellSubIndex”和相应非授权载波的频率信息。
可选地,可以移除非授权载波的上行配置。
可选地,供用户设备测量CSI和接收下行数据的非授权载波可以被指示为采用跨载波调度。
可选地,可以以LTE RRC信令中已有的“CrossCarrierSchedulingConfig”信息单元指示针对供用户设备测量CSI和接收下行数据的非授权载波采用跨载波调度。
可选地,供用户设备测量CSI和接收下行数据的非授权载波可以被指示为无下行控制信道。
可选地,所述方法还可以包括以下步骤:基站在授权载波上向所述用户设备传输跨载波调度信息。所述下行数据可以是在所述跨载波调度信息指示的非授权载波上传输的。
可选地,所述非授权载波的“SCellIndex”可以由所述授权载波的DCI中的CIF承载,从而指出该非授权载波正在被跨载波调度。
可选地,可以使用所述授权载波的DCI中的CIF的保留状态指示当前的下行调度是针对非授权载波的跨载波调度,并使用DCI中的其他域的若干比特和/或在DCI中定义若干新比特来承载一个“U-SCellIndex”信息,从而指示出当前的下行调度是针对哪个非授权载波的。
可选地,一些“SCellIndex”可以被定义为代表非授权载波,从而可以将所述授权载波的DCI中的CIF置为这些“SCellIndex”以指示当前的下行调度是针对“SCellIndex”所代表的非授权载波的跨载波调度,并可以使用DCI中的其他域的若干比特和/或在DCI中定义若干新比特来承载一个“U-SCellSubIndex”信息,从而指示出当前的下行调度是针对“SCellIndex”所代表的非授权载波中的哪个非授权载波的。
可选地,所述DCI中的其他域的若干比特可以是DCI中的“HARQ process number”和/或“Downlink Assignment Index”。
可选地,可以不在非授权载波上配置下行控制信道。
可选地,所述方法还可以包括:基站接收用户设备反馈的非授权载波的监测报告;基站接收用户设备反馈的CSI报告;以及基站接收用户
设备反馈的下行数据传输是否成功的确认信息。
根据本发明的第二方面,提供了一种由用户设备执行的用于支持非授权频谱上的通信的方法,包括以下步骤:用户设备在非授权载波上接收基站发送的U-DRS。
可选地,所述方法还可以包括:用户设备在非授权载波上接收基站发送的用于测量信道状态信息CSI的参考信号。
可选地,所述方法还可以包括:用户设备在非授权载波上接收基站发送的下行数据。
可选地,所述方法还可以包括:用户设备向基站反馈下行数据传输是否成功的确认信息。
可选地,所述方法还可以包括:用户设备在授权载波上接收对用于监测U-DRS的非授权载波的配置。
可选地,所述方法还可以包括:用户设备在授权载波上接收对用于测量CSI和接收下行数据的非授权载波的配置。
可选地,可以从用于监测U-DRS的非授权载波中选择一部分非授权载波作为用于测量CSI和接收下行数据的非授权载波,或者可以采用用于监测U-DRS的全部非授权载波作为用于测量CSI和接收下行数据的非授权载波。
可选地,所述方法还可以包括:用户设备在基站所配置的用于监测U-DRS的非授权载波上监测U-DRS并向基站反馈监测报告;以及用户设备在基站所配置的用于测量CSI和接收下行数据的非授权载波上测量并反馈CSI。
可选地,所述方法还可以包括:用户设备在授权载波上接收跨载波调度信息。所述下行数据可以是在所述跨载波调度信息所指示的非授权载波上接收的。
根据本发明的第三方面,提供了一种基站,包括:发送单元,用于在非授权载波上发送U-DRS。
可选地,所述发送单元还可以在非授权载波上发送用于测量CSI的参考信号。
可选地,所述发送单元还可以在非授权载波上向用户设备发送下行
数据。
可选地,所述基站还可以包括:配置单元,用于产生第一非授权载波配置,所述第一非授权载波配置用于配置供用户设备监测U-DRS的非授权载波。所述发送单元还可以用于在授权载波上发送第一非授权载波配置。
可选地,所述基站还可以包括:配置单元,用户产生第二非授权配置,所述第二非授权载波配置用于配置供用户设备测量CSI和接收下行数据的非授权载波。所述发送单元还可以用于在授权载波上发送第二非授权载波配置。
可选地,可以从供用户设备监测U-DRS的非授权载波中选择一部分非授权载波作为供用户设备测量CSI和接收下行数据的非授权载波,或者可以采用供用户设备监测U-DRS的全部非授权载波作为供用户设备测量CSI和接收下行数据的非授权载波。
可选地,所述基站还可以包括:调度单元,用于生成跨载波调度信息。所述发送单元可以在授权载波上发送所述跨载波调度信息,并且所述下行数据可以是在所述跨载波调度信息指示的非授权载波上传输的。
可选地,所述基站还可以包括:接收单元,用于接收用户设备反馈的非授权载波的监测报告、用户设备反馈的CSI报告、以及用户设备反馈的下行数据传输是否成功的确认信息。
根据本发明的第四方面,提供了一种用户设备,包括:接收单元,用于在非授权载波上接收U-DRS。
可选地,所述接收单元还可以用于在非授权载波上接收用于测量CSI的参考信号。
可选地,所述接收单元还可以用于在非授权载波上接收下行数据。
可选地,所述接收单元还可以用于在授权载波上接收对用于监测U-DRS的非授权载波的配置。
可选地,所述接收单元还可以用于在授权载波上接收对用于测量CSI和接收下行传输的非授权载波的配置。
可选地,可以从用于监测U-DRS的非授权载波中选择一部分非授权载波作为用于测量CSI和接收下行数据的非授权载波,或者可以采用用
于监测U-DRS的全部非授权载波作为用于测量CSI和接收下行数据的非授权载波。
可选地,所述用户设备还可以还包括测量单元和发送单元。所述测量单元可以用于对U-DRS实施测量并生成测量报告,以及测量CSI并生成CSI报告。所述发送单元可以用于发送基于U-DRS的测量报告,以及发送CSI报告。
可选地,所述接收单元还可以用于在授权载波上接收跨载波调度信息。所述用户设备还可以包括:数据解码单元,用于解码跨载波调度信息。所述下行数据可以是在所述跨载波调度信息指示的非授权载波上接收的。
可选地,所述数据解码单元还可以用于解码下行数据,并生成下行数据接收是否成功的确认信息。所述发送单元还可以用于向基站反馈所述确认信息。
通过下文结合附图的详细描述,本发明的上述和其它特征将会变得更加明显,其中:
图1示出了根据本发明的一个实施例的流程图;
图2示出了根据本发明的一个实施例的基站的结构框图;以及
图3示出了根据本发明的一个实施例的用户设备的结构框图。
以下将结合附图和具体实施例,对本发明所提出的用于支持非授权频谱上的通信的方法以及相应的基站和用户设备进行阐述。
应当注意的是,在以下的描述中,仅以示例的方式,示出了本发明的技术方案,但并不意味着本发明局限于下述步骤和单元结构。在可能的情形下,可以根据需要对步骤和单元结构进行调整和取舍。因此,某些步骤和单元并非实施本发明的总体发明思想所必需的元素。因此,本发明所必需的技术特征仅受限于能够实现本发明的总体发明思想的最低要求,而不受以下具体实例的限制。另外,为了简便起见,省略了对与
本发明没有直接关联的公知技术的详细描述,以防止对本发明的理解造成混淆。
下文以LTE移动通信系统及其后续的演进版本作为示例应用环境,具体描述了根据本发明的多个实施例。然而,需要指出的是,本发明不限于以下实施例,而是可适用于更多其它的无线通信系统,例如今后的5G蜂窝通信系统。
图1为根据本发明的一个实施例的用于支持非授权频谱上的通信的基站和用户设备的可能操作的图。如图所示,示例实施例包括以下步骤。
步骤S105:基站在非授权载波上向用户设备发送U-DRSs(Unlicensed-Discovery Reference Signals,非授权-小区发现参考信号)
在该步骤中,U-DRSs在系统中始终被发送(即,既使在有其他系统已经存在时也发送)。可选地,所述U-DRS是低功率U-DRS。这里,“低功率”是指U-DRSs的传输功率低于普通的下行传输信号,如数据信号等。U-DRSs的用处是使LTE-U的用户设备进行同步和/或RRM(Radio Resource Management,无线资源管理测量)和/或获取粗略(和细致)CSI(Channel State Information,信道状态信息)。U-DRSs的低功率传输的目的是降低U-DRSs对Wi-Fi等其他系统的干扰。
●需要指出的是,基站是有可能监测到附近Wi-Fi接入点的存在,比如通过搜索Wi-Fi接入点的广播信号(beacon signal)等。
至于U-DRSs的设计,其至少或可以含有LTE系统中的(部分)CSI-RSs(CSI reference signals,CSI参考信号)或者(部分)CRSs(common reference signals,公共参考信号)。相应地,一个信号能量密度比值需要被定义。优选地,所述信号能量密度比值通过CC-specific和/或UE-specific的RRC(Radio Resource Control,无线资源控制)信令进行配置。优选地,所述信号能量密度比值是LTE-U数据信号(Physical Downlink Shared Channel,PDSCH)的能量密度(Energy Per Resource Element,EPRE)与CSI-RS或CRS的能量能量密度。优选地,所述信号能量密度比值是授权载波上的CSI-RS或CRS的能量密度与所述非授权载波上的CSI-RS或CRS的能量密度之比。优选地,所述信号能量密
度比值的取值范围是非负的dB值(decibel,分贝)。或者,一个信号能量值需要被定义。优选地,所述信号能量值是所述CSI-RS或CRS的能量值。优选地,所述信号能量值通过CC-specific和/或UE-specific的无线资源控制RRC信令进行配置。
●需要指出的是,UE-specific的信号能量密度比值的技术效果是基站在进行LTE-U时,能够对不同的用户设备执行不同的下行功率控制。
与步骤S105相对应地,用户设备在非授权载波上接收U-DRS,从而能够发现非授权载波上的基站。由此,步骤S105提供了对非授权频谱上的通信的基本支持。
步骤S110:可选地,基站向用户设备配置非授权载波供用户设备监测U-DRSs
为实现该步骤,本发明提出如下3种基于RRC信令的方法。
方法1:使用目前LTE系统RRC信令中已有的信息单元“SCellIndex”(见TS 36.331)来指示授权载波和非授权载波的短ID。
另外,详细的非授权载波的配置与目前LTE系统RRC信令中已有的信息单元“SCellToAddMod-r10”(见TS 36.331)相似,所需改动如下(并不局限于以下改动):增加非授权载波的频率信息(频点、带宽等)和/或移除非授权载波的上行配置等。
另外,非授权载波上的U-DRSs需要被配置,其中可以包括步骤S105中阐述的CC-specific和/或UE-specific的功率信息。
●需要指出的是,方法1的优点在于简单,但其缺点也是显而易见的,即LTE-U的用户设备只有比较有限的机会能够使用非授权载波。这主要是由于目前LTE系统中“SCellIndex”取值为1至7,而且这些极为有限的数值需要被授权载波和非授权载波共享。当然,可以通过增加“SCellIndex”取值范围,如最大值增至15,从而克服这一缺点。
作为一个实施例,对于一个“SCellIndex”所指示的非授权载波的配
置包含非授权载波的频率信息(频点、带宽等),该信息为类似TS 36.331中dl-CarrierFreq对应的频带指示,而该频带指示对应的确切频点信息由类似TS 36.101表5.7.3-1中的E-UTRA Operating Band获得。这里我们需要指出的是,这里所有的类似表5.7.3-1是为了LTE-U预先定义的新的可用在5GHz上的频段的表格。例如表1所示。
表1:非授权载波的工作频谱(Unlicensed Operating Band)的例表
E-UTRA Unlicensed Operating Band | 频带范围(MHz) |
1 | 5170-5190 |
2 | 5190-5210 |
3 | 5210-5230 |
4 | 5230-5250 |
5 | 5250-5270 |
6 | 5270-5290 |
7 | 5290-5310 |
8 | 5310-5330 |
9 | 5490-5510 |
10 | 5510-5530 |
11 | 5530-5550 |
12 | 5550-5570 |
13 | 5570-5590 |
14 | 5590-5610 |
15 | 5610-5630 |
16 | 5630-5650 |
17 | 5650-5670 |
18 | 5670-5690 |
19 | 5690-5710 |
20 | 5710-5730 |
21 | 5735-5755 |
22 | 5755-5775 |
23 | 5775-5795 |
24 | 5795-5815 |
25 | 5815-5835 |
关于U-DRS的配置,作为一个实施例,CSI-RSs的配置被作为是U-DRS的配置的一部分。在CSI-RSs的配置中,一个CC-specific和/或UE-specific的RRC参数(比如写作PC或者PD)被定义为是LTE-U的PDSCH的能量密度与CSI-RS的能量能量密度的比值,或者授权载波上的CSI-RS或CRS的能量密度与所述CSI-RS的能量密度之比。如果进一步采用低功率U-DRS,所述信号能量密度比值的取值范围是非负的dB值。或者,在CSI-RSs的配置中,一个CC-specific和/或UE-specific的RRC参数被定义为是U-DRS中的CSI-RS的能量值。
作为另一个实施例,CRSs的配置被作为是U-DRS的配置的一部分。在CSI-RSs的配置中,一个CC-specific和/或UE-specific的RRC参数(比如写作PC或者PD)被定义为是LTE-U的PDSCH的能量密度与CRSs的能量能量密度的比值,或者授权载波上的CSI-RS或CRS的能量密度与所述CRS的能量密度之比。如果进一步采用低功率U-DRS,所述信号能量密度比值的取值范围是非负的dB值。或者,在CRSs的配置中,一个CC-specific和/或UE-specific的RRC参数被定义为是U-DRS中的CRS的能量值。
方法2:在LTE-U中定义一个新的信息单元(比如写作“U-SCellIndex”)。该“U-SCellIndex”取整数值,用来指示非授权载波的短ID。另外,每个“U-SCellIndex”与一个虚拟的“SCellIndex”构成链接。这里,所谓的“虚拟”是指,该“SCellIndex”是虚拟地配置给“U-SCellIndex”所指示的非授权载波,而且该虚拟“SCellIndex”可能已经被某个授权载波或者某个非授权载波使用。优选地,该虚拟“SCellIndex”取值范围为[N,8],其中,N为大于0并小于8的整数。
另外,详细的非授权载波的配置至少或可以包含,非授权载波的短ID“U-SCellIndex”、虚拟配置的“SCellIndex”、和非授权载波的频率信息(频点、带宽等)。进一步地,非授权载波的配置中,可能需要移除其上行配置。
另外,非授权载波上的U-DRSs能够被配置,其中可以包括步骤S105中阐述的CC-specific和/或UE-specific的功率信息。
●需要指出的是,“U-SCellIndex”的最大值可以显著大于7,于是相比于授权载波,LTE-U用户设备有可能机遇性地去使用许多非授权载波。
●还需要指出的是,将每个“U-SCellIndex”与一个虚拟的“SCellIndex”构成链接,能够使LTE-U系统完全重用现有的机制来确定用户设备在哪个资源上反馈接收是否成功的确认信息。
●还需要指出的是,在实现中,N一般取较大的数,比如N>4。这样做的目的是,按照目前LTE系统的定义,“SCellIndex”越大,其对应的载波的操作优先级别越低(比如在分配CSI的反馈资源的时候),而非授权载波应该相比授权载波应该具有较低的优先级。换言之,在LTE-U系统中,应该优先保证授权载波上的正常通信操作。
●还需要指出的是,用户设备在接收数据时,一般不需要考虑某个授权载波(其短ID为“SCellIndex”=M)与另一个非授权载波(其虚拟“SCellIndex”也为M)同时有下行传输的情况。
作为一个实施例,在LTE-U中定义一个新的信息单元(比如写作“U-SCellIndex-r13”),该信息单元的取值为正整数(1,2,...,10)。对于每个非授权载波,可以定义另一个信息单元“U-SCellToAddMod-r13”用来承载其详细配置。“U-SCellToAddMod-r13”至少或可以包含,非授权载波的短ID、虚拟配置的“SCellIndex”、和非授权载波的频率信息(频点、带宽等)。进一步地,非授权载波的配置中,可能需要移除其上行配置。其中,非授权载波的短ID由“U-SCellIndex-r13”来承载,比如“U-SCellIndex-r13”=8。在虚拟配置“SCellIndex”时,定义另一个新的信息单元来承载(比如写作“virtualSCellIndex-r13”)。在确定“virtualSCellIndex-r13”时,比如,取N=4,即“virtualSCellIndex-r13”取值范围为正整数(5,6,7)。非授权载波的频率信息为类似TS 36.331中dl-CarrierFreq对应的频带指示,而该频带指示对应的确切频点信息由类似TS 36.101表5.7.3-1中的E-UTRA Operating Band获得。这里我们需要指出的是,这里所有的类似表5.7.3-1是为了LTE-U预先定义的新的
可用在5GHz上的频段的表格。例如表1所示,但并不限定于表1的情形。
关于U-DRS的配置,作为一个实施例,CSI-RSs的配置可以被作为是U-DRS的配置的一部分。在CSI-RSs的配置中,一个CC-specific和/或UE-specific的RRC参数(比如写作PC或者PD)被定义为是LTE-U的PDSCH的能量密度与CSI-RS的能量能量密度的比值,或者授权载波上的CSI-RS或CRS的能量密度与所述CSI-RS的能量密度之比。如果进一步采用低功率U-DRS,所述信号能量密度比值的取值范围是非负的dB值。或者,在CSI-RSs的配置中,一个CC-specific和/或UE-specific的RRC参数被定义为是U-DRS中的CSI-RS的能量值。
作为另一个实施例,CRSs的配置被作为是U-DRS的配置的一部分。在CSI-RSs的配置中,一个CC-specific和/或UE-specific的RRC参数(比如写作PC或者PD)被定义为是LTE-U的PDSCH的能量密度与CRSs的能量能量密度的比值,或者授权载波上的CSI-RS或CRS的能量密度与所述CRS的能量密度之比。如果进一步采用低功率U-DRS,所述信号能量密度比值的取值范围是非负的dB值。或者,在CRSs的配置中,一个CC-specific和/或UE-specific的RRC参数被定义为是U-DRS中的CRS的能量值。
方法3:使用目前LTE系统RRC信令中已有的信息单元“SCellIndex”(见TS 36.331)来指示授权载波和非授权载波的短ID。
其与方法1的区别在于,详细的非授权载波的配置与目前LTE系统RRC信令中已有的信息单元“SCellToAddMod-r10”(见TS 36.331)基本相似,但需要进行重大改动。所需改动如下(并不局限于以下改动):增加一个载波类型标志位来指示某个“SCellIndex”对应的是一个授权载波还是一个非授权载波,和/或当所述载波类型标志位指示非授权载波时,需要增加一个列表信息用于承载一个候选非授权载波的集合的配置。所述候选非授权载波的集合的配置至少或可以包含,一个候选非授权载波的子索引号序列(比如写作“U-SCellSubIndex”)和相应非授权载波的频率信息(频点、带宽等)。进一步地,非授权载波的配置中,可能需要移除其上行配置。当所述载波类型标志位指示授权载波时,采用LTE系统
已有的信息单元“SCellToAddMod-r10”来配置对应的授权载波即可。
另外,非授权载波上的U-DRSs能够被配置,其中可以包括步骤S105中阐述的CC-specific和/或UE-specific的功率信息。
●需要指出的是,用于指示非授权载波的“SCellIndex”可以不只是一个。本发明对该数目不要求作任何限定。
●还需要指出的是,所述候选非授权载波的集合内,可以只含有一个非授权载波。本发明对该数目不要求作任何限定。
●还需要指出的是,候选非授权载波的总数可以显著大于7,于是相比于授权载波,LTE-U用户设备有可能机遇性地去使用许多非授权载波。
●还需要指出的是,实际上,每个候选非授权载波都与一个“SCellIndex”构成链接,这能够使LTE-U系统完全重用现有的机制来确定用户设备在哪个资源上反馈接收是否成功的确认信息。
●还需要指出的是,用户设备在接收数据时,一般不需要考虑某个非授权载波(其对应的“SCellIndex”=M)与另一个非授权载波(其对应的“SCellIndex”也为M)同时有下行传输的情况。
作为一个实施例,设两个“SCellIndex”(5,7)指示非授权载波。对于每个“SCellIndex”(5或7),一个改进的信息单元“SCellToAddMod-r13”被定义用于承载详细的非授权载波的配置。更具体地,“SCellToAddMod-r13”至少包含一个载波类型标志位(比如写作“SCellType-r13”,比如其为布尔值)来指示“SCellIndex”对应的是一个授权载波还是一个非授权载波(比如“SCellType-r13”=1表示授权载波,“SCellType-r13”=0表示非授权载波)。对于“SCellIndex”=5和“SCellIndex”=7的情况,需要或可以分别配置一个列表信息用于承载一个候选非授权载波的集合。例如,对于“SCellIndex”=5,一个包含4个候选非授权载波的列表被配置,其至少包含一个候选非授权载波的子索引号序列(比如写作“U-SCellSubIndex-r13”)和相应非授权载波的频率信息(频点、带宽等)。表2示出了一个相关例子。在表2中,候选非授权载波的频率信息为类似TS 36.331中dl-CarrierFreq对应的频带指示,而该频带指示对应的确切频点信息由类似TS 36.101表5.7.3-1中的
E-UTRA Operating Band获得。这里我们需要指出的是,这里所有的类似表5.7.3-1是为了LTE-U预先定义的新的可用在5GHz上的频段的表格。例如表1所示,但并不限定于表1的情形。
表2:一个包含4个候选非授权载波的列表例子
U-SCellSubIndex-r13 | dl-CarrierFreq-r13 |
1 | 11 |
2 | 7 |
3 | 8 |
4 | 3 |
再例如,对于“SCellIndex”=7,一个包含7个候选非授权载波的列表被配置,其至少或可以包含一个候选非授权载波的子索引号序列(比如写作“U-SCellSubIndex-r13”)和相应非授权载波的频率信息(频点、带宽等)。表3示出了一个相关例子。在表3中,候选非授权载波的频率信息为类似TS 36.331中dl-CarrierFreq对应的频带指示,而该频带指示对应的确切频点信息由类似TS 36.101表5.7.3-1中的E-UTRA Operating Band获得。这里我们需要指出的是,这里所有的类似表5.7.3-1是为了LTE-U预先定义的新的可用在5GHz上的频段的表格。例如表1所示。
表3:一个包含7个候选非授权载波的列表例子
U-SCellSubIndex | dl-CarrierFreq-r13 |
1 | 2 |
2 | 16 |
3 | 5 |
4 | 13 |
5 | 14 |
6 | 1 |
7 | 9 |
关于U-DRS的配置,作为一个实施例,CSI-RSs的配置可以被作为是U-DRS的配置的一部分。在CSI-RSs的配置中,一个CC-specific和/或UE-specific的RRC参数(比如写作PC或者PD)被定义为是LTE-U
的PDSCH的能量密度与CSI-RS的能量能量密度的比值,或者授权载波上的CSI-RS或CRS的能量密度与所述CSI-RS的能量密度之比。如果进一步采用低功率U-DRS,所述信号能量密度比值的取值范围是非负的dB值。或者,在CSI-RSs的配置中,一个CC-specific和/或UE-specific的RRC参数被定义为是U-DRS中的CSI-RS的能量值。
作为另一个实施例,CRSs的配置被作为是U-DRS的配置的一部分。在CSI-RSs的配置中,一个CC-specific和/或UE-specific的RRC参数(比如写作PC或者PD)被定义为是LTE-U的PDSCH的能量密度与CRSs的能量能量密度的比值,或者授权载波上的CSI-RS或CRS的能量密度与所述CRS的能量密度之比。如果进一步采用低功率U-DRS,所述信号能量密度比值的取值范围是非负的dB值。或者,在CRSs的配置中,一个CC-specific和/或UE-specific的RRC参数被定义为是U-DRS中的CRS的能量值。
步骤S115:可选地,用户设备实施测量并向基站反馈测量报告
在该步骤中,用户设备在步骤S110中配置的非授权载波上对于U-DRSs进行测量,并向基站反馈相应的测量报告。需要指出的是,对于参考信号进行测量并反馈测量报告是目前LTE网络中的一项标准流程,本发明不对该步骤提出任何限定性要求。
步骤S120:可选地,基站配置非授权载波供用户设备测量CSI(Channel State Information,信道状态信息)和接收下行传输
供用户设备测量CSI和接收下行传输的非授权载波集合可以是供用户设备监测U-DRSs非授权载波集合(步骤S110的配置)的子集。即,基站可以从步骤S110的配置集合中选择部分非授权载波作为供用户设备测量CSI和接收下行传输的非授权载波集合,或者可以直接采用步骤S110的配置集合作为供用户设备测量CSI和接收下行传输的非授权载波集合。
对于从步骤S110的配置集合中选择部分非授权载波作为供用户设备测量CSI和接收下行传输的非授权载波集合,需要或可以使用RRC信令进行配置供用户设备测量CSI和接收下行传输的非授权载波集合。
详细的RRC信令配置与步骤S110描述的细节相同,不同之处只在于非授权载波的数量的减少,在此不赘述。
对于直接采用步骤S110的配置集合作为供用户设备测量CSI和接收下行传输的非授权载波集合,只需事先将供用户设备测量CSI和接收下行传输的非授权载波集合定义为与供用户设备监测U-DRSs非授权载波集合相同即可,无需额外操作。
在事先约定了用户设备采用基站所配置的U-DRS非授权载波集合中的哪些载波来测量CSI和接收下行传输的情况下,可以省略该配置步骤。
对于本步骤中的供用户设备测量CSI和接收下行传输的非授权载波,需要配置如何进行跨载波调度,例如是否需要跨载波调度,用户设备从哪个载波上接收跨载波调度等。该配置可以采用目前LTE系统RRC信令中已有的“CrossCarrierSchedulingConfig”信息单元,在该信息单元中,非授权载波的下行调度信息将被配置为始终从授权载波上收取。
●需要指出的是,步骤S110中提出的3种方法,都适用于步骤S120。
步骤S125:可选地,用户设备在已配置的非授权载波上测量CSI并反馈相应CSI
在该步骤中,用户设备可以在步骤S120中配置的非授权载波上接收基站发送的用于测量信道状态信息CSI的参考信号,测量CSI,并向基站反馈相应CSI。需要指出的是,测量和反馈CSI是目前LTE网络中的一项标准流程,本发明不对该步骤提出任何限定性要求。
步骤S130:可选地,基站决定何时以及如何使用非授权载波
为了使得LTE系统能够与其他系统(如Wi-Fi系统)公平地共享非授权载波的资源,基站需要智能地决定何时以及如何使用非授权载波。这是一项基站内部实现的步骤,本发明不对该步骤提出任何限定性要求。
步骤S135:可选地,基站在授权载波上传输跨载波调度的信息,并在非授权载波上传输下行数据
为此,本发明提出3种基于DCI(downlink control information,下
行控制信息)的方法。该3种方法分别基于步骤S110和步骤S120中提出的3种方法。
方法1:基于步骤S110和步骤S120中的方法1,目前LTE系统的DCI信令可以直接被用来跨载波调度LTE-U系统中非授权载波上的下行传输。更具体地,在目前LTE系统的下行跨载波调度DCI中,DCI格式1,1A,1B,1D,2,2A,2B,2C都含有一个3比特的域用于指示一个“SCellIndex”,该“SCellIndex”对应的载波就是DCI调度的目标载波。该3比特的域可以被称为CIF(Carrier Indicator Field)。
●需要指出的是,此处,“SCellIndex”对应的载波可以是授权载波,也可以是非授权载波。这是因为在方法1中,“SCellIndex”的取值需要被授权载波和非授权载波共享。
作为一个实施例,设“SCellIndex=0”对应的载波是一个授权载波(“SCellIndex=0”对应的载波在LTE系统中又被称为主载波),“SCellIndex=6”对应的载波是一个非授权载波。另外,设在步骤S120中,“SCellIndex=6”对应的载波被配置为从“SCellIndex=0”对应的载波上接收跨载波调度信息。于是,在“SCellIndex=0”对应的载波上跨载波调度“SCellIndex=6”对应的载波的DCI中,CIF应该被置为110(表示“SCellIndex=6”对应的载波正在被调度)。DCI中的其他信息与LTE系统中的定义相同。
作为另一个实施例,设“SCellIndex=2”对应的载波是一个授权载波(“SCellIndex=2”对应的载波在LTE系统中又被称为副载波),“SCellIndex=6”对应的载波是一个非授权载波。另外,设在步骤S120中,“SCellIndex=6”对应的载波被配置为从“SCellIndex=2”对应的载波上接收跨载波调度信息。于是,在“SCellIndex=2”对应的载波上跨载波调度“SCellIndex=6”对应的载波的DCI中,CIF应该被置为110(表示“SCellIndex=6”对应的载波正在被调度)。DCI中的其他信息与LTE系统中的定义相同。
采用该方法的优点在于,相对于现有的DCI格式无需增加新的比特位,从而能够在不增加开销的情况下实现对非授权载波的跨载波调度。
方法2:基于步骤S110和步骤S120中的方法2,基站使用CIF的保留状态,即000(亦不排除其他任意特定的值),指示当前的下行调度是针对非授权载波,并用DCI中的其他域的若干比特和/或在DCI中定义若干新比特来承载一个“U-SCellIndex”信息,从而指示出目前的下行调度是针对哪个非授权载波。优选地,所述DCI中的其他域的若干比特,是指DCI中的“HARQ process number”(原用于下行重传)和/或“Downlink Assignment Index”(原用于TDD系统)。
●需要指出的是,DCI中的“HARQ process number”和“Downlink Assignment Index”(只针对TDD系统)这两个域在下行跨载波调度DCI中(DCI格式1,1A,1B,1D,2,2A,2B,2C)都存在。
作为一个实施例,设“SCellIndex=0”对应的载波是一个授权载波(“SCellIndex=0”对应的载波在LTE系统中又被称为主载波),“U-SCellIndex=3”对应的载波是一个非授权载波。另外,设在步骤S120中,“U-SCellIndex=3”对应的载波被配置为从“SCellIndex=0”对应的载波上接收跨载波调度信息。于是,在“SCellIndex=0”对应的载波上跨载波调度“U-SCellIndex=3”对应的载波的DCI中,CIF应该被置为000(保留状态)。另外,DCI中的“HARQ process number”域中的2个比特被置为11,从而指示出“U-SCellIndex=3”对应的非授权载波正在被调度。DCI中的其他信息与LTE系统中的定义相同。
作为另一个实施例,设“SCellIndex=0”对应的载波是一个授权载波(“SCellIndex=0”对应的载波在LTE系统中又被称为主载波),“U-SCellIndex=5”对应的载波是一个非授权载波。另外,设在步骤S120中,“U-SCellIndex=5”对应的载波被配置为从“SCellIndex=0”对应的载波上接收跨载波调度信息。于是,在“SCellIndex=0”对应的载波上跨载波调度“U-SCellIndex=5”对应的载波的DCI中,CIF应该被置为000(保留状态)。另外,在DCI中新定义3个比特位,并置其为101,从而指示出“U-SCellIndex=5”对应的非授权载波正在被调度。DCI中的其他信息与LTE系统中的定义相同。
作为另一个实施例,设“SCellIndex=2”对应的载波是一个授权载波(“SCellIndex=2”对应的载波在LTE系统中又被称为副载波),
“U-SCellIndex=3”对应的载波是一个非授权载波。另外,设在步骤S120中,“U-SCellIndex=3”对应的载波被配置为从“SCellIndex=2”对应的载波上接收跨载波调度信息。于是,在“SCellIndex=2”对应的载波上跨载波调度“U-SCellIndex=3”对应的载波的DCI中,CIF应该被置为000(保留状态)。另外,DCI中的“HARQ process number”域中的2个比特被置为11,从而指示出“U-SCellIndex=3”对应的非授权载波正在被调度。DCI中的其他信息与LTE系统中的定义相同。
作为另一个实施例,设“SCellIndex=2”对应的载波是一个授权载波(“SCellIndex=2”对应的载波在LTE系统中又被称为副载波),“U-SCellIndex=5”对应的载波是一个非授权载波。另外,设在步骤S120中,“U-SCellIndex=5”对应的载波被配置为从“SCellIndex=2”对应的载波上接收跨载波调度信息。于是,在“SCellIndex=2”对应的载波上跨载波调度“U-SCellIndex=5”对应的载波的DCI中,CIF应该被置为000(保留状态)。另外,在DCI中新定义3个比特位,并置其为101,从而指示出“U-SCellIndex=5”对应的非授权载波正在被调度。DCI中的其他信息与LTE系统中的定义相同。
采用该方法的优点在于,能够更简洁地实现对非授权载波的跨载波调度,减少系统的实现复杂度。并且,在使用了上述优选方案的情况下,亦不会增加系统开销。
方法3:基于步骤S110和步骤S120中的方法3,某些“SCellIndex”已经被定义为代表非授权载波,于是基站将CIF置为这些“SCellIndex”就可以指示当前的下行调度是针对非授权载波。另外,基站用DCI中的其他域的若干比特和/或在DCI中定义若干新比特来承载一个“U-SCellSubIndex”信息,从而指示出目前的下行调度是针对哪个非授权载波。优选地,所述DCI中的其他域的若干比特,是指DCI中的“HARQ process number”(原用于下行重传)和/或“Downlink Assignment Index”(原用于TDD系统)。
●需要指出的是,DCI中的“HARQ process number”和“Downlink Assignment Index”(只针对TDD系统)这两个域在下行跨载波调度DCI中(DCI格式1,1A,1B,1D,2,2A,2B,2C)都存在。
作为一个实施例,设“SCellIndex=0”对应的载波是一个授权载波(“SCellIndex=0”对应的载波在LTE系统中又被称为主载波),另一个“SCellIndex=5”对应的载波代表一个含有4个候选非授权载波的集合(见表2)。设在步骤S120中,“SCellIndex=5”对应的载波被配置为从“SCellIndex=0”对应的载波上接收跨载波调度信息。进一步地,表2中“U-SCellSubIndex=2”对应的非授权载波被基站选择为下行传输的载波。于是,在“SCellIndex=0”对应的载波上跨载波调度“SCellIndex=5”对应的载波的DCI中,CIF应该被置为101(表示“SCellIndex=5”对应的载波正在被调度)。另外,DCI中的“HARQ process number”域中的2个比特被置为10,从而指示出“U-SCellSubIndex=2”对应的非授权载波正在被调度。DCI中的其他信息与LTE系统中的定义相同。
作为另一个实施例,设“SCellIndex=0”对应的载波是一个授权载波(“SCellIndex=0”对应的载波在LTE系统中又被称为主载波),另一个“SCellIndex=5”对应的载波代表一个含有7个候选非授权载波的集合(见表3)。设在步骤S120中,“SCellIndex=5”对应的载波被配置为从“SCellIndex=0”对应的载波上接收跨载波调度信息。进一步地,表3中“U-SCellSubIndex=6”对应的非授权载波被基站选择为下行传输的载波。于是,在“SCellIndex=0”对应的载波上跨载波调度“SCellIndex=5”对应的载波的DCI中,CIF应该被置为101(表示“SCellIndex=5”对应的载波正在被调度)。另外,在DCI中新定义3个比特位,并置其为110,从而指示出“U-SCellSubIndex=6”对应的非授权载波正在被调度。DCI中的其他信息与LTE系统中的定义相同。
作为另一个实施例,设“SCellIndex=2”对应的载波是一个授权载波(“SCellIndex=2”对应的载波在LTE系统中又被称为副载波),另一个“SCellIndex=5”对应的载波代表一个含有4个候选非授权载波的集合(见表2)。设在步骤S120中,“SCellIndex=5”对应的载波被配置为从“SCellIndex=2”对应的载波上接收跨载波调度信息。进一步地,表2中“U-SCellSubIndex=2”对应的非授权载波被基站选择为下行传输的载波。于是,在“SCellIndex=2”对应的载波上跨载波调度“SCellIndex=5”对应的载波的DCI中,CIF应该被置为101(表示“SCellIndex=5”对应的载波正
在被调度)。另外,DCI中的“HARQ process number”域中的2个比特被置为10,从而指示出“U-SCellSubIndex=2”对应的非授权载波正在被调度。DCI中的其他信息与LTE系统中的定义相同。
作为另一个实施例,设“SCellIndex=2”对应的载波是一个授权载波(“SCellIndex=2”对应的载波在LTE系统中又被称为副载波),另一个“SCellIndex=5”对应的载波代表一个含有7个候选非授权载波的集合(见表3)。设在步骤S120中,“SCellIndex=5”对应的载波被配置为从“SCellIndex=2”对应的载波上接收跨载波调度信息。进一步地,表3中“U-SCellSubIndex=6”对应的非授权载波被基站选择为下行传输的载波。于是,在“SCellIndex=2”对应的载波上跨载波调度“SCellIndex=5”对应的载波的DCI中,CIF应该被置为101(表示“SCellIndex=5”对应的载波正在被调度)。另外,在DCI中新定义3个比特位,并置其为110,从而指示出“U-SCellSubIndex=6”对应的非授权载波正在被调度。DCI中的其他信息与LTE系统中的定义相同。
采用该方法的优点在于,能够在更大范围内自由地实现对非授权载波的跨载波调度。
并且,在使用了上述优选方案的情况下,即不另外新定义比特位,而是用DCI中的其他域的若干比特(例如“HARQ process number”(原用于下行重传)和/或“Downlink Assignment Index”(原用于TDD系统))来承载一个“U-SCellSubIndex”信息的情况下,除了有上述优点之外亦不会增加系统开销。
步骤S140:可选地,用户设备在授权载波上接收跨载波调度的信息,并在非授权载波上接收下行数据
在本步骤中,用户设备在授权载波上接收跨载波调度的信息,并在非授权载波上接收下行数据。
优选地,为了节省系统开销,非授权载波上的下行控制信道(Physical Downlink Control Channel,PDCCH)区域可以减小为零。为了实现这一技术,在步骤S120配置中跨载波调度的信息时,可以将非授权载波上的下行控制信道配置为零。或者,非授权载波上的下行控制信道可以预先被定义为零,无需额外信令开销。
作为一个实施例,在步骤S120配置非授权载波的跨载波调度的信息时,可以将“CrossCarrierSchedulingConfig”信息单元的域“pdsch-Start”设置为0。
作为另一个实施例,非授权载波的PDSCH的起始OFDM符号位置被预先定义为0,无需信令进行配置。
如此,将非授权载波上的下行控制信道区域减小为零,可以节省系统开销,提高频谱资源的利用效率。
步骤S145:可选地,用户设备反馈接收是否成功的确认信息
在该步骤中,如果下行接收是成功的,用户设备会生成表示ACK的信息。反之,用户设备会生成表示NAK的信息。然后,用户设备将ACK/NAK信息反馈给基站。需要指出的是,ACK/NAK反馈是目前LTE网络中的一项标准流程,本发明不对该步骤提出任何限定性要求。
图2示出了根据本发明的一个实施例的基站400的结构框图。如图2所示,基站400至少包括发送单元415,用于在非授权载波上发送U-DRS。所述基站400还可以包括接收单元405、配置单元410和调度单元420组成。其中,接收单元405可以接收来自用户设备的非授权载波的测量报告、CSI报告、以及下行数据接收是否成功的确认信息。配置单元410可以配置非授权载波供用户设备监测U-DRSs,和配置非授权载波供用户设备测量CSI和接收下行传输。发送单元415还可以用于在授权载波上发送非授权载波的配置供用户设备监测U-DRSs,在授权载波上发送非授权载波的配置供用户设备测量CSI和接收下行传输,以及在授权载波上发送跨载波调度的信息,并在非授权载波上发送下行数据。调度单元420可以决定何时以及如何使用非授权载波,并可以生成跨载波调度的信息。
图3示出了根据本发明的一个实施例的用户设备的结构框图。如图3所示,用户设备600至少包括接收单元605,用于在非授权载波上接收U-DRS。所述用户设备600还可以包括:测量单元610、发送单元615和数据解码单元620。接收单元605还可以在授权载波上接收非授权载波的配置用于监测(低功率)U-DRSs,在授权载波上接收非授权载波的
配置用于测量CSI和接收下行传输,在非授权载波上接收用于测量CSI的参考信号,在授权载波上接收跨载波调度的信息,以及在非授权载波上接收下行数据。测量单元610可以对(低功率)U-DRSs实施测量并生成测量报告,和测量非授权载波的CSI并生成CSI报告。发送单元615可以发送基于(低功率)U-DRSs的测量报告,发送非授权载波的CSI报告,发送下行接收是否成功的确认信息。数据解码单元620可以解码跨载波调度的信息,解码下行数据,并生成下行接收是否成功的确认信息。
应该理解,本发明的上述实施例可以通过软件、硬件或者软件和硬件两者的结合来实现。例如,上述实施例中的基站和用户设备内部的各种组件可以通过多种器件来实现,这些器件包括但不限于:模拟电路器件、数字电路器件、数字信号处理(DSP)电路、可编程处理器、专用集成电路(ASIC)、现场可编程门阵列(FPGA)、可编程逻辑器件(CPLD),等等。
在本申请中,“基站”是指一种广义的无线通信传输节点,比如宏基站、微基站、中继等,其至少包括数据接收和发送的功能。“用户设备”是指用户移动终端,例如包括移动电话、笔记本等可以与基站或者微基站进行无线通信的终端设备。
此外,这里所公开的本发明的实施例可以在计算机程序产品上实现。更具体地,该计算机程序产品是如下的一种产品:具有计算机可读介质,计算机可读介质上编码有计算机程序逻辑,当在计算设备上执行时,该计算机程序逻辑提供相关的操作以实现本发明的上述技术方案。当在计算系统的至少一个处理器上执行时,计算机程序逻辑使得处理器执行本发明实施例所述的操作(方法)。本发明的这种设置典型地提供为设置或编码在例如光介质(例如CD-ROM)、软盘或硬盘等的计算机可读介质上的软件、代码和/或其他数据结构、或者诸如一个或多个ROM或RAM或PROM芯片上的固件或微代码的其他介质、或一个或多个模块中的可下载的软件图像、共享数据库等。软件或固件或这种配置可安装在计算设备上,以使得计算设备中的一个或多个处理器执行本发明实施例所描述的技术方案。
尽管以上已经结合本发明的优选实施例示出了本发明,但是本领域
的技术人员将会理解,在不脱离本发明的精神和范围的情况下,可以对本发明进行各种修改、替换和改变。因此,本发明不应由上述实施例来限定,而应由所附权利要求及其等价物来限定。
Claims (45)
- 一种由基站执行的用于支持非授权频谱上的通信的方法,包括以下步骤:基站在非授权载波上发送非授权-小区发现参考信号U-DRS。
- 根据权利要求1所述的方法,还包括:基站在非授权载波上发送用于测量信道状态信息CSI的参考信号。
- 根据权利要求1或2所述的方法,还包括:基站在非授权载波上向用户设备发送下行数据。
- 根据权利要求1所述的方法,还包括:基站向用户设备配置供所述用户设备监测U-DRS的非授权载波。
- 根据权利要求2所述的方法,还包括:基站向用户设备配置供所述用户设备测量CSI和接收下行数据的非授权载波。
- 根据权利要求4或5所述的方法,其中,从供用户设备监测U-DRS的非授权载波中选择一部分非授权载波作为供用户设备测量CSI和接收下行数据的非授权载波,或者采用供用户设备监测U-DRS的全部非授权载波作为供用户设备测量CSI和接收下行数据的非授权载波。
- 根据权利要求1所述的方法,其中,所述U-DRS至少含有一部分信道状态信息参考信号CSI-RS或者一部分公共参考信号CRS。
- 根据权利要求1或7所述的方法,其中,所述U-DRS是以比下行数据或授权载波上的参考信号的发送功率低的功率发送的。
- 根据权利要求5或6所述的方法,其中,使用LTE RRC信令中已有的信息单元“SCellIndex”来指示授权载波和非授权载波的短ID,非授权载波的详细配置由修改后的LTE RRC信令中已有的信息单元“SCellToAddMod-r10”指示,所述修改包括:增加非授权载波的频率信息。
- 根据权利要求5或6所述的方法,其中,使用新定义的信息单元“U-SCellIndex”来指示非授权载波的短ID,每个“U-SCellIndex”与一个虚拟“SCellIndex”构成链接,非授权载波的详细配置至少包含:“U-SCellIndex”所指示的非授权载波的短ID、虚拟“SCellIndex”和非授权载波的频率信息。
- 根据权利要求10所述的方法,其中,该虚拟“SCellIndex”取值范围为[N,8],其中,N为大于0并小于8的整数。
- 根据权利要求5或6所述的方法,其中,使用LTE RRC信令中已有的信息单元“SCellIndex”来指示授权载波和非授权载波的短ID,非授权载波的详细配置由修改后的LTE RRC信令中已有的信息单元“SCellToAddMod-r10”指示,所述修改包括:增加一个载波类型标志位来指示某个“SCellIndex”对应的是一个授权载波还是一个非授权载波;和/或当所述载波类型标志位指示非授权载波时,增加一个列表信息用于承载一个候选非授权载波的集合的配置。
- 根据权利要求12所述的方法,其中,所述候选非授权载波的集合的配置至少包含:一个候选非授权载波的子索引号序列“U-SCellSubIndex”和相应非授权载波的频率信息。
- 根据权利要求5所述的方法,其中,供用户设备测量CSI和接收下行数据的非授权载波被指示为采用跨载波调度。
- 根据权利要求14所述的方法,其中,以LTE RRC信令中已有的“CrossCarrierSchedulingConfig”信息单元指示针对供用户设备测量CSI和接收下行数据的非授权载波采用跨载波调度。
- 根据权利要求3所述的方法,还包括以下步骤:基站在授权载波上向所述用户设备传输跨载波调度信息,其中,所述下行数据是在所述跨载波调度信息指示的非授权载波上传输的。
- 根据权利要求16所述的方法,其中,所述非授权载波的“SCellIndex”由所述授权载波的DCI中的CIF承载,从而指出该非授权载波正在被跨载波调度。
- 根据权利要求16所述的方法,其中,使用所述授权载波的DCI中的CIF的保留状态指示当前的下行调度是针对非授权载波的跨载波调 度,并使用DCI中的其他域的若干比特和/或在DCI中定义若干新比特来承载一个“U-SCellIndex”信息,从而指示出当前的下行调度是针对哪个非授权载波的。
- 根据权利要求16所述的方法,其中,一些“SCellIndex”已经被定义为代表非授权载波,将所述授权载波的DCI中的CIF置为这些“SCellIndex”以指示当前的下行调度是针对“SCellIndex”所代表的非授权载波的跨载波调度,并使用DCI中的其他域的若干比特和/或在DCI中定义若干新比特来承载一个“U-SCellSubIndex”信息,从而指示出当前的下行调度是针对“SCellIndex”所代表的非授权载波中的哪个非授权载波的。
- 根据权利要求18或19所述的方法,其中,所述DCI中的其他域的若干比特是指DCI中的“HARQ process number”和/或“Downlink Assignment Index”。
- 一种由用户设备执行的用于支持非授权频谱上的通信的方法,包括以下步骤:用户设备在非授权载波上接收基站发送的U-DRS。
- 根据权利要求21所述的方法,还包括:用户设备在非授权载波上接收基站发送的用于测量信道状态信息CSI的参考信号。
- 根据权利要求21或22所述的方法,还包括:用户设备在非授权载波上接收基站发送的下行数据。
- 根据权利要求21所述的方法,还包括:用户设备在授权载波上从所述基站接收对用于监测U-DRS的非授权载波的配置。
- 根据权利要求22所述的方法,还包括:用户设备在授权载波上从所述基站接收对用于测量CSI和接收下行数据的非授权载波的配置。
- 根据权利要求24或25所述的方法,其中,从用于监测U-DRS的非授权载波中选择一部分非授权载波作为用于测量CSI和接收下行数据的非授权载波,或者采用用于监测U-DRS的全部非授权载波作为用于测量CSI和接收下行数据的非授权载波。
- 根据权利要求22所述的方法,还包括:用户设备在非授权载波上监测U-DRS并向基站反馈监测报告;以及用户设备在非授权载波上测量并反馈CSI。
- 根据权利要求23所述的方法,还包括:用户设备在授权载波上接收跨载波调度信息,其中,所述下行数据是在所述跨载波调度信息所指示的非授权载波上接收的。
- 一种基站,包括:发送单元,用于在非授权载波上发送U-DRS。
- 根据权利要求29所述的基站,其中,所述发送单元还在非授权载波上发送用于测量CSI的参考信号。
- 根据权利要求29或30所述的基站,其中,所述发送单元还在非授权载波上向用户设备发送下行数据。
- 根据权利要求29所述的基站,还包括:配置单元,用于产生第一非授权载波配置,所述第一非授权载波配置用于配置供用户设备监测U-DRS的非授权载波,并且其中所述发送单元用于在授权载波上发送第一非授权载波配置。
- 根据权利要求30所述的基站,还包括:配置单元,用户产生第二非授权配置,所述第二非授权载波配置用于配置供用户设备测量CSI和接收下行数据的非授权载波,并且其中所述发送单元用于在授权载波上发送第二非授权载波配置。
- 根据权利要求32或33所述的基站,其中,从供用户设备监测U-DRS的非授权载波中选择一部分非授权载波作为供用户设备测量CSI和接收下行数据的非授权载波,或者采用供用户设备监测U-DRS的全部非授权载波作为供用户设备测量CSI和接收下行数据的非授权载波。
- 根据权利要求31所述的基站,还包括:调度单元,用于生成跨载波调度信息,并且其中,所述发送单元在授权载波上发送所述跨载波调度信息,并且所述下行数据是在所述跨载波调度信息指示的非授权载波上传输的。
- 根据权利要求31所述的基站,还包括:接收单元,用于接收用户设备反馈的非授权载波的监测报告、用户设备反馈的CSI报告、以及用户设备反馈的下行数据传输是否成功的确认信息。
- 一种用户设备,包括:接收单元,用于在非授权载波上接收U-DRS。
- 根据权利要求37所述的用户设备,其中,所述接收单元还用于在非授权载波上接收用于测量CSI的参考信号。
- 根据权利要求37或38所述的用户设备,其中,所述接收单元还用于在非授权载波上接收下行数据。
- 根据权利要求37所述的用户设备,其中,所述接收单元还用于在授权载波上接收对用于监测U-DRS的非授权载波的配置。
- 根据权利要求38所述的用户设备,其中,所述接收单元还用于在授权载波上接收对用于测量CSI和接收下行传输的非授权载波的配置。
- 根据权利要求40或41所述的用户设备,其中,从用于监测U-DRS的非授权载波中选择一部分非授权载波作为用于测量CSI和接收下行数据的非授权载波,或者采用用于监测U-DRS的全部非授权载波作为用于测量CSI和接收下行数据的非授权载波。
- 根据权利要求38所述的用户设备,还包括:测量单元,用于对U-DRS实施测量并生成测量报告,以及测量CSI并生成CSI报告;以及发送单元,用于发送基于U-DRS的测量报告,以及发送CSI报告。
- 根据权利要求39所述的用户设备,其中,所述接收单元还用于在授权载波上接收跨载波调度信息,所述用户设备还包括:数据解码单元,用于解码跨载波调度信息,并且其中,所述下行数据是在所述跨载波调度信息指示的非授权载波上接收的。
- 根据权利要求44所述的用户设备,其中,所述数据解码单元还用于解码下行数据,并生成下行数据接收是否成功的确认信息,所述发送单元还用于向基站反馈所述确认信息。
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CN107889221B (zh) * | 2016-09-29 | 2022-02-08 | 华为技术有限公司 | 信息的调度方法、接收方法及相关装置 |
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