WO2016119470A1 - Procédé et appareil de transmission de signal - Google Patents

Procédé et appareil de transmission de signal Download PDF

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Publication number
WO2016119470A1
WO2016119470A1 PCT/CN2015/089872 CN2015089872W WO2016119470A1 WO 2016119470 A1 WO2016119470 A1 WO 2016119470A1 CN 2015089872 W CN2015089872 W CN 2015089872W WO 2016119470 A1 WO2016119470 A1 WO 2016119470A1
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Prior art keywords
scs
signal
laa
send
configuration information
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PCT/CN2015/089872
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English (en)
Chinese (zh)
Inventor
徐汉青
赵亚军
莫林梅
苟伟
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中兴通讯股份有限公司
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Priority claimed from CN201510040772.2A external-priority patent/CN105991254A/zh
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2016119470A1 publication Critical patent/WO2016119470A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • 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

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a signal transmitting method and apparatus.
  • LTE uses UnLTE-U (Long Term Evolution–Unlicensed) to deploy LTE in unlicensed carriers to meet the increasing capacity requirements of LTE systems and improve the efficiency of unlicensed spectrum. It is LTE and the future. An important evolutionary direction of wireless communication is possible.
  • LTE-U it is necessary to consider how to conduct data transmission with a fair and friendly competitive unlicensed carrier between the wireless system (Wireless Fidelity), radar and other different systems and the LTE-U system. Does not affect and retain LTE technology features.
  • the LTE-U system may also be referred to as an LTE Licensed Assisted Access (LAA) system.
  • LAA LTE Licensed Assisted Access
  • the LAA access point or the base station After the LAA access point or the base station preempts the resources, it needs to perform a series of processes such as cell discovery, synchronization, uplink/downlink reception and measurement, channel state information (CSI, Channel State Information) feedback, and scheduling, which takes a lot of time. (several ms, even 10ms), that is to say, a considerable part of the time resources occupied by the LAA access point or base station are used to handle operations other than data transmission, which will greatly reduce the spectrum usage of the LAA system. Efficiency and performance.
  • CSI Channel State Information
  • the embodiments of the present invention provide:
  • a signal transmission method is applied to an LTE authorized carrier assisted access LAA access point or a LAA base station, including:
  • the signal is transmitted using the SCS based on the determined configuration information.
  • the method further includes: transmitting, to the other LAA access point or the LAA base station, the configuration information that uses the SCS to send a signal,
  • the method further includes: before the non-authorized carrier non-occupation period uses configuration information of the SCS transmission signal, the method further includes:
  • the configuration information of the other LAA access point or the LAA base station received by the SCA in the first preset time period whether to use the SCS to send a signal, determine whether to use the SCS to send a signal, and then perform a subsequent process to determine to use the short control signal.
  • the configuration information that causes the SCS to send a signal is not limited to the configuration information of the other LAA access point or the LAA base station received by the SCA in the first preset time period.
  • the method further includes: before the non-authorized carrier non-occupation period uses configuration information of the SCS transmission signal, the method further includes:
  • the determining, by using the SCS, the configuration information that is sent by the SCS during the non-authorized carrier non-occupation period includes:
  • the preset usage of the resource for the SCS transmission is monitored, and when the preset resource for the SCS transmission is capable of signaling, the preset resource for the SCS transmission is used to send a signal.
  • the method further includes: performing a clear channel assessment CCA on the resources other than the preset or the determined resources for SCS transmission, and determining, for the SCS transmission, Resources.
  • the determining, by using the SCS, the configuration information of the signal includes:
  • one or more carriers are selected for SCS signal transmission.
  • the method further includes: before the non-authorized carrier non-occupation period uses configuration information of the SCS transmission signal, the method further includes:
  • a coordination request is sent to one or more other LAA access points or LAA base stations.
  • the method further includes:
  • the use of the SCS to transmit the signal is stopped, or the configuration information of the signal transmitted using the SCS is adjusted.
  • the method further includes: when the configuration information of the signal sent by the SCS is changed, the LAA access point or the LAA base station sends a notification message to the other LAA access point or the LAA base station, and carries the changed configuration information.
  • the signal includes one or more of the following: a primary synchronization signal PSS/secondary synchronization signal SSS, a cell-specific reference signal CRS, a positioning reference signal PRS, a channel sounding reference signal SRS, a discovery signal DRS, and a channel state.
  • the reference signal CSI-RS and the physical downlink control channel PDCCH bearer signal are indicated.
  • the configuration information includes one or more of the following: period, offset, duration, port, power, time-frequency resources.
  • the method further includes:
  • the reference signal is periodically transmitted according to a preset period.
  • the reference signal is sent on a preset resource before the unlicensed carrier is occupied.
  • the method further includes:
  • the configuration information is continuously used to transmit signals.
  • the method further includes:
  • the signal is stopped when the unlicensed carrier is occupied, or the signal is continuously transmitted on the preset resource.
  • the embodiment of the present invention further provides a signal sending apparatus, which is disposed at a LAA access point or a LAA base station, where the apparatus includes: a first processing module and a first sending module;
  • the first processing module is configured to determine configuration information that uses an SCS to send a signal during an unlicensed carrier non-occupation period;
  • the first sending module is configured to send the signal by using an SCS according to the determined configuration information.
  • the apparatus further includes a second sending module, a receiving module, and a second processing module;
  • the second sending module is configured to send the configuration information that uses the SCS to send a signal to another LAA access point or a LAA base station;
  • the receiving module is configured to receive configuration information that is sent by using a SCS from another LAA access point or a LAA base station;
  • the second processing module is configured to determine, according to configuration information of the other LAA access point or the LAA base station that the receiving module receives in the first preset time period, whether to use the SCS to send a signal, and determine to use the SCS to send a signal. Then, the first processing module is notified to perform processing.
  • the apparatus further includes a third processing module and a fourth processing module,
  • the third processing module is configured to listen to or detect information that other LAA access points or LAA base stations use the SCS to send signals in the second preset time period;
  • the fourth processing module is configured to determine, according to the intercepted or detected information, whether to use the SCS to send a signal, and determine to use the SCS to send a signal, and then notify the first processing module to perform processing.
  • the first processing module is specifically configured to obtain a preset for SCS The resource information sent; and the occupancy of the preset resource for SCS transmission, where the preset resource for SCS transmission can be used for signaling, and the preset is used for SCS transmission.
  • the resource sends a signal.
  • the first processing module is specifically configured to perform a clear channel assessment CCA on resources other than the preset or the determined resources for SCS transmission, and determine the SCS for sending Resources.
  • the first processing module is specifically configured to select one or more carriers for SCS signal transmission according to a preset selection algorithm.
  • the apparatus further includes a third transmitting module,
  • the third sending module is configured to send a coordination request to another one or more LAA access points or LAA base stations.
  • the apparatus further includes an adjustment module,
  • the adjusting module is configured to stop using the SCS to send a signal when the current LAA access point or the LAA base station does not send the service data in the third preset time period, or adjust configuration information using the SC sending signal to avoid resources. waste.
  • the apparatus further includes a fourth sending module,
  • the fourth sending module is configured to send a notification message to the other LAA access point or the LAA base station to carry the changed configuration information when the current LAA access point or the configuration information of the LAA base station using the SC transmission signal changes.
  • the device periodically transmits a reference signal according to a preset period in an unlicensed carrier non-occupancy period, and/or transmits a reference signal on a preset resource before occupying the unlicensed carrier.
  • the device continues to use the configuration information to transmit signals during an unlicensed carrier occupancy period.
  • the device stops transmitting the signal during an unlicensed carrier occupation period.
  • the signal is continuously transmitted on a preset resource.
  • the third sending module, the adjusting module, and the fourth sending module may use a central processing unit (CPU), a digital signal processor (DSP), or a programmable logic array when performing processing.
  • CPU central processing unit
  • DSP digital signal processor
  • FPGA Field-Programmable Gate Array
  • the method and device for transmitting a signal according to the embodiment of the present invention are applied to a LAA access point or a LAA base station, and specifically, determining configuration information for transmitting a signal by using a short control signaling SCS during an unlicensed carrier non-occupation period;
  • the configuration information is sent using the SCS.
  • the embodiment of the present invention implements signal transmission before occupying an unlicensed carrier, and can improve spectrum utilization efficiency and performance of the LAA system.
  • FIG. 1 is a schematic flowchart of a signal sending method according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a signal sending apparatus according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of still another signal sending apparatus according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of still another signal sending apparatus according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of still another signal sending apparatus according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of still another signal sending apparatus according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of still another signal sending apparatus according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a carrier occupancy situation in Embodiment 5 of the present invention.
  • FIG. 9 is a schematic diagram of a carrier occupancy situation in Embodiment 6 of the present invention.
  • the unlicensed spectrum of the general control has a maximum occupation time of about 10 ms (generally geographical difference), so the reference signals for cell discovery, synchronization, and measurement, such as the primary synchronization signal (PSS, Primary), are transmitted after occupying the unlicensed carrier.
  • Synchronous Signal /Secondary Synchronous Signal (SSS), Cell-specific Reference Signal (CRS), Positioning Reference Signal (PRS), Channel Sounding Reference Signal (SRS, Sounding Reference Signal)
  • the discovery signal DRS, Discovery Reference Signal
  • the channel state indication reference signal CSI-RS, Channel State Indication RS
  • PDCCH Physical Downlink Control Channel
  • Physical Downlink Control Channel Physical Downlink Control Channel
  • the unlicensed carrier is required to support the LBT (Listen before Talk) function.
  • LBT Listen before Talk
  • a clear channel assessment (CCA) function needs to be performed. If the device is found to be using the unlicensed carrier, or the detected signal energy exceeds the CCA threshold, the access is delayed. If the channel is found to be idle, or the detected signal energy is lower than the CCA threshold, the unlicensed carrier is occupied.
  • the LBT/CCA will restrict the LAA reference signal from being sent before occupying the unlicensed carrier.
  • ETSI European Telecommunications Standards Institute
  • SCS Short Control Signalling
  • management and control frames such as ACK/NACK signals
  • SCS transmission has strict limits: if SCS is used, the short signaling transmission duty of the adaptive device does not exceed 5%, which is 2.5 ms, during the observation period of 50 ms. This limitation has little effect on WLAN/WiFi, but for multiple LAA sites, how to coordinate the transmission of various reference signals in such a short limited time is an urgent problem to be solved.
  • the technical problem to be solved by the present invention is to provide a transmission message before the unlicensed carrier is occupied.
  • FIG. 1 is a schematic flowchart of a signal sending method according to an embodiment of the present invention. The method is applied to a LAA access point or a LAA base station. As shown in FIG. 1 , the method includes:
  • Step 11 Determine configuration information for transmitting a signal using the short control signaling SCS during the non-authorized carrier non-occupation period.
  • the short control signaling SCS mentioned in the present invention refers not only to the SCS in the ETSI specification, but also to the specified non-occupation period special duration for transmitting short-term signals and channels.
  • the signal and channel are transmitted within the SCS duration, and the LAA access point does not need to perform the Clear Channel Assessment (CCA) and Listen-Before-Talk (LBT) functions.
  • CCA Clear Channel Assessment
  • LBT Listen-Before-Talk
  • the SCS transmission duration needs to meet certain regulatory requirements, otherwise it violates the principle of friendly coexistence of different systems and devices in the unlicensed frequency band.
  • Some regions and countries may have additional names and definitions for SCS, collectively referred to herein as SCS. In some regions and countries, SCS may not be defined. For these regions and countries, SCS and similar rules may be defined (for example, the requirements for the length of transmission, and the duration of the fixed period of observation shall not be greater than the set ratio) for the non-occupied period.
  • the signal is sent.
  • Step 12 Send the signal using the SCS according to the determined configuration information.
  • the system can coordinate transmission, that is, whether the interaction between the LAA access point or the LAA base station sends DRS and DRS configuration information.
  • the LAA access point or the LAA base station transmits its own configuration information for transmitting signals using the SCS to other LAA access points or LAA base stations.
  • the method further includes: before the non-authorized carrier non-occupation period uses the configuration information of the SCS transmission signal, the method further includes:
  • the method further includes: before the non-authorized carrier non-occupation period uses configuration information of the SCS transmission signal, the method further includes:
  • the determining, by using the SCS, the configuration information that is sent by the SCS during the non-authorized carrier non-occupation period includes:
  • the preset usage of the resource for the SCS transmission is monitored, and when the preset resource for the SCS transmission is capable of signaling, the preset resource for the SCS transmission is used to send a signal.
  • the method further includes: performing a clear channel assessment (CCA) on the resources other than the preset or the determined resources for SCS transmission, and determining resources used for SCS transmission.
  • CCA clear channel assessment
  • the signals may be continuously transmitted on these resources by means of frequency domain multiplexing.
  • the resources described in this embodiment include, but are not limited to, a radio frame, a subframe, a slot, an OFDM symbol, and a resource unit (RE).
  • a radio frame a subframe
  • a slot a slot
  • OFDM symbol a resource unit
  • each LAA access point or LAA base station can be preset (limited, coordinated) to ensure that it is sent at least once in 160 ms (that is, the transmission pattern of the DRS is solidified to ensure compliance with the regulatory requirements of the SCS), if it is desired to shorten If the DRS period is sent, then CCA needs to be performed. If it is idle, of course, DRS can be sent.
  • the CCA does not send data after listening, but sends a DRS for cell detection, T/F tracking, and RRM measurement.
  • the determining, by using the short control signaling, the configuration information of the signal sent by the SCS includes:
  • one or more carriers are selected for SCS signal transmission.
  • one or more low-load carriers may be selected for SCS signal transmission according to carrier load.
  • the determining, by using the SCS, the configuration information that is sent by the SCS during the non-authorized carrier non-occupation period includes:
  • the SCS resource that uses the SCS to send the signal is determined randomly or according to the preset minimum occupancy information
  • the idle and/or occupied SCS resources are selected to transmit signals.
  • the method further includes: before the non-authorized carrier non-occupation period uses configuration information of the SCS transmission signal, the method further includes:
  • a coordination request is sent to one or more other LAA access points or LAA base stations.
  • the method further includes:
  • the LAA access point or the LAA base station does not send the service data within the third preset time period, stop using the SCS to send a signal, or adjust the configuration information of the signal sent using the SCS to avoid waste of resources.
  • the DRS can be adjusted. Send configuration to reduce the occupation of SCS. Or, stop sending DRS. Each time the preemption is completed, a certain time is reserved to send the DRS to maintain synchronization.
  • the method further includes: when the configuration information of the signal sent by the SCS is changed, the LAA access point or the LAA base station sends a notification message to the other LAA access point or the LAA base station, and carries the changed configuration information.
  • the signal includes one or more of the following: a primary synchronization signal PSS/secondary synchronization signal SSS, a cell-specific reference signal CRS, a positioning reference signal PRS, a channel sounding reference signal SRS, a downlink dedicated reference signal DRS,
  • the physical downlink control channel PDCCH carries a signal.
  • the configuration information includes one or more of the following: period, offset, duration, port, power, time-frequency resources.
  • the method further includes:
  • the reference signal is periodically transmitted according to a preset period.
  • the reference signal is sent on a preset resource before the unlicensed carrier is occupied.
  • the method further includes:
  • the configuration information is continuously used to transmit signals.
  • the method further includes:
  • the signal is stopped when the unlicensed carrier is occupied, or the signal is continuously transmitted on the preset resource.
  • the embodiment of the present invention further provides a signal sending device, which is disposed at a LAA access point or a LAA base station. As shown in FIG. 2, the device includes: a first processing module 201 and a first a sending module 202; wherein
  • the first processing module 201 is configured to determine configuration information that uses an SCS to send a signal during an unlicensed carrier non-occupation period;
  • the first sending module 202 is configured to send the signal by using an SCS according to the determined configuration information.
  • the device further includes a second sending module 203, a receiving module 204, and a second processing module 205;
  • the second sending module 203 is configured to send the configuration information that uses the SCS to send signals to other LAA access points or LAA base stations;
  • the receiving module 204 is configured to receive configuration information that is sent by using a SCS from another LAA access point or a LAA base station;
  • the second processing module 205 is configured to determine, according to configuration information of the other LAA access point or the LAA base station that the receiving module 204 receives in the first preset time period, whether to use the SCS to send a signal, and determine to use the SCS.
  • the first processing module 201 is notified to perform processing.
  • the apparatus further includes a third processing module 206 and a fourth processing module 207.
  • the third processing module 206 is configured to listen to or detect information that other LAA access points or LAA base stations use the SCS to send signals in the second preset time period;
  • the fourth processing module 207 is configured to determine whether to use the SCS to send a signal according to the intercepted or detected information, and determine to use the SCS to send a signal, and then notify the first processing module 201 to perform processing.
  • the first processing module is configured to acquire preset resource information for SCS transmission, and listen to the preset usage of resources for SCS transmission, where the preset When the resource for SCS transmission can be signaled, the preset use is used.
  • the resource sent by the SCS sends a signal.
  • the first processing module is specifically configured to perform a clear channel assessment CCA on resources other than the preset or the determined resources for SCS transmission, and determine the SCS for sending Resources.
  • the first processing module is specifically configured to select one or more carriers for SCS signal transmission according to a preset selection algorithm.
  • the first processing module is specifically configured to determine, when the other LAA access point or the LAA base station does not use the SCS to send a signal, determine whether to use the SCS to send a signal randomly or according to preset minimum occupancy information.
  • SCS resources in the case where other LAA access points or LAA base stations use SCS to transmit signals, the idle and/or occupied SCS resources are selected to transmit signals.
  • the apparatus further includes a third sending module 208.
  • the third sending module 208 is configured to send a coordination request to another one or more LAA access points or LAA base stations.
  • the device further includes an adjustment module 209,
  • the adjusting module 209 is configured to stop using the SCS to send a signal when the current LAA access point or the LAA base station does not send the service data in the third preset time period, or adjust configuration information of the signal sent by using the SCS to avoid Waste of resources.
  • the apparatus further includes a fourth sending module 210,
  • the fourth sending module 210 is configured to send a notification message to the other LAA access point or the LAA base station to carry the changed configuration information when the configuration information of the current LAA access point or the LAA base station using the SCS transmission signal changes.
  • the device periodically transmits the reference signal according to a preset period in an unlicensed carrier non-occupancy period, and/or transmits the reference signal in a preset subframe before occupying the unlicensed carrier.
  • transmitting DRS is a solution to cell discovery, coarse synchronization, and RRM measurement problems.
  • DRS can follow a long week The period is periodically transmitted (for example, 40 ms, 80 ms, 1 ms in the 160 ms period, and the coarse synchronization is maintained). If the fine synchronization and CSI acquisition are to be solved, it is necessary to transmit CRS, CSI-RS (5ms, or 5ms-10ms) in the first few subframes occupying the unlicensed carrier, which is bursty.
  • the device continues to use the configuration information to transmit signals during an unlicensed carrier occupancy period.
  • the device stops transmitting the signal during an unlicensed carrier occupation period, or continues to transmit the signal on a preset resource.
  • the solution of the present invention is equally suitable for transmitting other signals or channels, including newly designed signals, before the unlicensed carrier is occupied.
  • This embodiment takes the ETSI regulations and regulatory requirements as an example, that is, before using an unlicensed carrier, the LBT/CCA function needs to be performed.
  • short control signaling SCS can be used to transmit management and control frames (such as ACK/NACK signals), and LBT/CCA does not need to be executed before transmission. If SCS is used, the short signaling transmission duty cycle of the adaptive device does not exceed 5%, which is 2.5 ms, during the 50 ms observation period.
  • SCS short signaling transmission duty cycle of the adaptive device does not exceed 5%, which is 2.5 ms, during the 50 ms observation period.
  • the DRS includes PSS/SSS, CRS, and CSI-RS (configurable).
  • PSS/SSS and CRS are used for cell discovery and synchronization, and CRS and CSI-RS are used for RRM measurements.
  • CRS and CSI-RS are single port configurations.
  • CRS in each subframe The symbols that appear are: symbol 0, symbol 4, symbol 7, symbol 11.
  • SS appears in symbol 0 and symbol 6 of subframe 0 and subframe 5.
  • the symbols appearing in the CSI-RS are: symbol 9, symbol 10.
  • the meanings of the symbols appearing in the following are the same as the OFDM symbols specified in the LTE protocol (1 subframe is 1 ms, and 1 subframe contains 14 or 12 OFDM symbols depending on the length of the CP. ).
  • the duration of the DRS is 1 subframe, the number of symbols actually transmitted is 8 symbols; if the duration of the DRS is 2 subframes, the number of symbols actually transmitted is 12 (SS and CSI-RS within 2 subframes)
  • the number of occupied symbols is the same as the number of occupied symbols in one subframe, and so on;
  • This embodiment describes a pre-signal coordination mechanism, including:
  • Step 1 Before the LAA access point sends the DRS, it needs to perform an inter-cell transmission coordination mechanism.
  • the DRS parameters may include one or more of the following: period, offset, duration, port, power, time-frequency resources, and the like.
  • the notification method can be transmitted through a wired connection or a wireless air interface between LAA access points.
  • the wireless mode can be transmitted on the licensed spectrum or through other unlicensed carriers that have obtained the occupied rights.
  • the LAA access point Before sending a DRS, the LAA access point needs to determine whether it can send and send parameters according to the number of received DRS LAAs and the corresponding parameter configuration.
  • LAA access point When the LAA access point is ready to initially transmit the DRS or change the DRS transmission configuration, it is necessary to determine a new DRS transmission configuration according to the information that has been exchanged between the cells. LAA access point sends normally In the process of DRS, there is no need to perform an inter-cell transmission coordination mechanism in each cycle.
  • LAA access points there are 5 LAA access points as neighboring access points (APs), which are AP1, AP2, AP3, AP4, and AP5, respectively.
  • CASE 1 The LAA access point does not receive any proximity access point notifications and will send DRS. At this time, the DRS configuration mode of the LAA access point has the greatest flexibility.
  • AP5 is ready to send DRS, and it will send DRS without receiving any neighbor AP notification before sending. Therefore, AP5 can send DRS through ETSI SCS mode, but it needs to comply with the SCS control requirements, and should consider the need to send DRS to neighboring APs in the future. Under the condition of satisfying its own requirements, it is better to send DRS according to the minimum occupancy. For example, a 50 ms period, a 1 ms duration, and a 0 subframe offset can be selected to transmit the DRS. At this time, the AP5's DRS configuration mode has maximum flexibility.
  • the LAA access point receives a notification that the neighboring access point sends a DRS, and the available time of the SCS is partially available. At this time, the DRS configuration mode of the LAA access point is limited.
  • AP5 is ready to send DRS. Before sending, it is known that AP1 and AP2 are sending DRS.
  • the parameter sent by AP1 to AP5DRS is: the period is 50ms, the duration is 2ms, and the offset is 0 subframe.
  • AP2 notifies AP5DRS that the parameters are: period is 50ms, duration is 2ms, offset is 2 subframes; then AP1
  • AP5 cannot occupy 2 subframes (857us) independently within 50ms, and can occupy 1 subframe (571us) independently.
  • the AP5 period is set to be greater than or equal to 50ms, the independent duration is 1 subframe, and the offset is arbitrarily configurable.
  • AP5 and AP1 or AP2 occupy all or part of the same symbol, but are distinguished by frequency division or code division. If the time domain is the same, the frequency domain is staggered. The duration may be 1 subframe, 2 subframes, or 3 subframes. At this time, the DRS configuration mode of AP5 is greatly restricted.
  • the LAA access point receives the notification that the neighboring access point sends the DRS, and the SCS can occupy The elapsed time is nearly full or has been occupied. At this time, the LAA access point can only be repeatedly occupied on the occupied SCS subframe or symbol, and cannot occupy new sub-frames or symbols. Or perform other coordination mechanisms below.
  • AP5 is ready to send DRS. Before sending, it is known that AP1, AP2 and AP3 are sending DRS.
  • the parameters sent by AP1 to AP5DRS are: the period is 50ms, the duration is 2ms, and the offset is 0.
  • the parameters sent by AP2 to AP5DRS are: period is 50ms, duration is 2ms, offset is 2 subframes; AP3 notification
  • the parameters sent by the AP5DRS are: the period is 50ms, the duration is 1ms, and the offset is 4 subframes.
  • AP5 is not enough to occupy 1 subframe independently. It can only occupy the same symbol as AP1, AP2, or AP3. At this time, AP5 can only be repeatedly occupied on the occupied subframe or symbol, and cannot occupy new subframes or symbols.
  • the inter-cell transmission coordination is performed in order not to violate the SCS control requirements. If the duration of 2.5ms available for SCS transmission is close to full or has been occupied during the observation period of 50ms, the LAA access point that prepares to send DRS before the unlicensed carrier is occupied can only be used to send DRS. The DRS of the access point is sent on the time domain resource, and the new time domain resource cannot be used to send the DRS within the 50 ms period. To satisfy such conditions, the LAA access point does not need to perform the LBT/CCA function before transmitting the DRS before the unlicensed carrier is occupied.
  • DRS can also be sent through coordination.
  • the same operator can allocate DRS transmission modes of several LAA access points in the same deployment location.
  • a DRS transmission request command can be sent to the neighboring access point.
  • the access point that has no service for a long time can stop sending the DRS signal; or the LAA access point with short DRS transmission period and long time can adjust its parameter configuration and let some time domain resources send DRS requests.
  • the instruction's access point is used.
  • the LAA access point that stops transmitting the DRS signal or the LAA access point that adjusts the DRS transmission configuration needs to resend the new configuration mode (or terminate the transmission signal) to the neighboring access point after the DRS transmission mode is updated.
  • the LAA access point can also query the neighboring LAA access point for transmission before sending the DRS. According to the response situation of the neighboring access point, it is determined whether the DRS is sent before the carrier is occupied, and the configuration parameters are sent.
  • the transmission coordination mechanism for transmitting the DRS or other necessary signals between the cells includes at least one or more of the following:
  • the interaction of whether to send the DRS information and/or the parameter configuration of the DRS can be divided into two ways: the first is to notify the neighboring access point, and the neighboring access point does not need to respond.
  • the second similar handshake mechanism notifies the neighboring access point, and the neighboring access point gives the confirmation information.
  • the access point that sends the DRS actively notifies the neighboring access point, and when the neighboring access point is ready to send the DRS, it only needs to count the received information to decide whether to send or not.
  • the DAS access point Before the DAS access point sends the DRS, it needs to determine whether it can send according to the parameter configuration of the DRS that has been sent by the neighboring access point, and specifically send the parameters;
  • a LAA access point observes that the occupied duration of the SCS has been occupied or nearly full, and may send a DRS transmission request command to the neighboring access point for coordination;
  • the LAA with no service for a long time can stop sending DRS signals; or the LAA access point with short DRS transmission period and long time can adjust its parameter configuration, and let some time domain resources be used by the access point that sends the DRS request command. ;
  • the LAA access point that stops transmitting the DRS signal, or the LAA access point that adjusts the DRS transmission configuration needs to resend the new configuration mode (or terminate the transmission) after the DRS transmission mode is updated. Signal) to neighboring access points.
  • multiple neighboring LAA access points can be coordinated with the carrier system to send DRS.
  • the LAA access point may also query the neighboring LAA access point for transmission before sending the DRS. According to the response situation of the neighboring access point, it is determined whether the DRS is sent before the carrier is occupied, and the configuration parameters are sent. h. Another method is to coordinate the power of the SCS between the LAA access points. For example, two LAA access points that are far apart from each other, and another access point already occupying 2.5 ms SCS transmission time in 50 ms, the access point may not comply with the regulatory requirements. There are also two methods: First, the neighboring LAA access point interactively transmits the power parameter configuration of the DRS to perform transmission coordination. Second, the LAA access point measures the signal in the SCS. If it is lower than the detection threshold, the LAA access point does not consider this to be an effective occupation of the SCS. Therefore, the signal occupation time below the detection threshold is not counted in the SCS.
  • Step 2 The LAA access point starts to send the DRS after determining the DRS transmission configuration according to step 1, and needs to notify the neighboring LAA access point of the DRS transmission information and/or the DRS parameter configuration.
  • the LAA access point that sends the DRS needs to notify the neighboring LAA access point to start transmitting the DRS and the parameters of the sent DRS before sending the DRS or starting to send the DRS.
  • the DRS parameters may include one or more of the following: period, offset, duration, port, power, time-frequency resources, and the like.
  • the notification method can be transmitted through a wired connection or a wireless air interface between LAA access points.
  • the wireless mode can be transmitted on the licensed spectrum or through other unlicensed carriers that have obtained the occupied rights.
  • the LAA access point does not notify the neighboring access point of its own DRS transmission information, and/or DRS parameter configuration after determining that the DRS can be transmitted through the SCS. After receiving the inquiry information sent by the neighboring LAA access point, the above information is sent to the neighboring LAA access point.
  • Step 3 There is no service transmission or competition requirement for a long time, and the transmission configuration of the DRS can be changed. You can even stop sending DRS.
  • the first possible option is that the LAA access point can stop sending DRS. For example, if there are many access points and an access point does not send data for a long time, it will be used for the last time, start the timer, and keep a certain time to send the DRS to maintain synchronization to prevent re-occupying demand in the short term. After a certain period of time, the DRS can be stopped and the SCS can be sent to other sites. The first competing access after not transmitting data for a long time may pay a synchronization cost.
  • the transmission configuration of the DRS can be changed. For example, after the last occupation is completed, the timer is started. After a certain timing, the transmission configuration of the DRS can be updated to reduce the occupation of the available SCS. For example, the transmission configuration of the original DRS is 25 ms, the duration is 2 ms, and the offset is 0 subframes. After a certain timing, there is no new service access, and the updateable DRS transmission configuration is 100 ms, and the duration is 1ms, offset to 0 subframes.
  • the LAA access point that stops transmitting the DRS signal or the LAA access point that adjusts the DRS transmission configuration needs to resend the new configuration mode (or the information that terminates the transmission signal) to the neighboring access point.
  • Step 4 The UE performs cell detection, time-frequency tracking, and RRM measurement according to the received DRS signal.
  • the DRS includes PSS/SSS, CRS, and CSI-RS (configurable).
  • PSS/SSS and CRS are used for cell discovery and synchronization
  • CRS and CSI-RS are used for RRM measurements.
  • the embodiment relates to a pre-signaling listening mechanism, which specifically includes:
  • Step 1 Before the LAA access point sends the DRS, the interception mechanism needs to be performed.
  • the LAA access point performs the listening statistics before sending the DRS.
  • the timer can be started to count the DRSs that occur within a certain period of time (for example, at least the maximum period of the DRS, such as 200 ms), and determine the number of LAA access points that are sending DRS. , DRS transmission pattern and other information.
  • the LAA access point Before the LAA access point sends the DRS, it needs to send the number of DRS LAAs according to the detected number. And the corresponding parameter configuration, to decide whether you can send, and send parameters.
  • the LAA access point When the LAA access point is ready to initially transmit the DRS, or change the DRS transmission configuration, it is necessary to determine a new DRS transmission configuration based on the interception and detection information. During the normal transmission of the DRS by the LAA access point, there is no need to listen every cycle.
  • LAA access points there are five LAA access points as neighboring access points, namely AP1, AP2, AP3, AP4, and AP5.
  • AP5 is ready to send DRS. Before sending, it does not hear any neighboring access point notifications and will send DRS. Therefore, AP5 can send DRS through ETSI SCS mode, but it needs to comply with the SCS control requirements, and should consider the need to send DRS to neighboring APs in the future. Under the condition of satisfying its own requirements, it is better to send DRS according to the minimum occupancy. For example, a 50 ms period, a 1 ms duration, and a 0 subframe offset can be selected to transmit the DRS. At this time, the AP5's DRS configuration mode has maximum flexibility.
  • CASE 2 During the listening time, the LAA access point detects that there is a neighboring access point to send DRS, and the available time of the SCS is partially available. At this time, the DRS configuration mode of the LAA access point is limited.
  • AP5 is ready to send DRS, and it is detected that AP1 and AP2 are sending DRS before sending.
  • the parameter sent by AP1 to AP5DRS is: the period is 50ms, the duration is 2ms, and the offset is 0 subframe.
  • AP2 notifies AP5DRS that the parameters are: period is 50ms, duration is 2ms, offset is 2 subframes; then AP1
  • AP5 cannot occupy 2 subframes (857us) independently within 50ms, and can occupy 1 subframe (571us) independently.
  • the AP5 period is set to be greater than or equal to 50ms
  • the independent duration is 1 subframe
  • the offset is arbitrarily configurable.
  • AP5 and AP1 or AP2 occupy all or part of the same symbol, but are distinguished by frequency division or code division, and the duration may be 1 subframe, 2 subframes, or 3 subframes.
  • the DRS configuration mode of AP5 is greatly restricted.
  • the LAA access point detects that there is a neighboring access point sending DRS, and the available time of the SCS is close to full or has been occupied. At this time, the LAA access point can only be in the The occupied SCS subframe or symbol is repeatedly occupied, and cannot occupy new subframes or symbols.
  • AP5 is ready to send DRS, and it has been detected that AP1, AP2 and AP3 are transmitting DRS before sending.
  • the parameters sent by AP1 to AP5DRS are: the period is 50ms, the duration is 2ms, and the offset is 0.
  • the parameters sent by AP2 to AP5DRS are: period is 50ms, duration is 2ms, offset is 2 subframes; AP3 notification
  • the parameters sent by the AP5DRS are: the period is 50ms, the duration is 1ms, and the offset is 4 subframes.
  • AP5 is not enough to occupy 1 subframe independently. It can only occupy the same symbol as AP1, AP2, or AP3. At this time, AP5 can only be repeatedly occupied on the occupied subframe or symbol, and cannot occupy new subframes or symbols.
  • the AP5 cannot clearly determine the number of LAA stations and the transmission pattern of the DRS, it can determine whether the unlicensed carrier is occupied by means of energy detection. If it is not occupied, it can determine the SCS. Time-frequency resources.
  • the LAA access point listens and detects before sending, in order not to violate the SCS control requirements. If the duration of 2.5ms available for SCS transmission is close to full or has been occupied during the observation period of 50ms, the LAA access point that prepares to send DRS before the unlicensed carrier is occupied can only be used to send DRS. The DRS of the access point is sent on the time domain resource, and the new time domain resource cannot be used to send the DRS within the 50 ms period. To satisfy such conditions, the LAA access point does not need to perform the LBT/CCA function before transmitting the DRS before the unlicensed carrier is occupied.
  • the DRS can also be transmitted through coordination with the operator or the same access system. For example with the operator The DRS transmission mode of several LAA access points under the same deployment location can be assigned. Even when a LAA access point detects that the SCS occupiable time has been occupied or nearly full, it can send a DRS transmission request command to the neighboring access point. After receiving the command, the access point that has no service for a long time can stop sending the DRS signal; or the LAA access point with short DRS transmission period and long time can adjust its parameter configuration and let some time domain resources send DRS requests. The instruction's access point is used. The LAA access point that stops transmitting the DRS signal or the LAA access point that adjusts the DRS transmission configuration needs to resend the new configuration mode (or terminate the transmission signal) to the neighboring access point after the DRS transmission mode is updated.
  • Step 2 The LAA access point starts to send the DRS after determining the DRS transmission configuration according to step 1.
  • Step 3 There is no service transmission or competition requirement for a long time, and the transmission configuration of the DRS can be changed, and even the DRS can be stopped.
  • the first possible option is that the LAA access point can stop sending DRS. For example, if there are many access points and an access point does not send data for a long time, it will be used for the last time, start the timer, and keep a certain time to send the DRS to maintain synchronization to prevent re-occupying demand in the short term. After a certain period of time, the DRS can be stopped and the SCS can be sent to other sites. The first competing access after not transmitting data for a long time must pay the synchronization cost.
  • the transmission configuration of the DRS can be changed. For example, after the last occupation is completed, the timer is started. After a certain timing, the transmission configuration of the DRS can be updated to reduce the occupation of the available SCS. For example, the transmission configuration of the original DRS is 25 ms, the duration is 2 ms, and the offset is 0 subframes. After a certain timing, there is no new service access, and the updateable DRS transmission configuration is 100 ms, and the duration is 1ms, offset to 0 subframes.
  • the LAA access point that stops transmitting the DRS signal or the LAA access point that adjusts the DRS transmission configuration may also resend the new configuration mode (or the information that terminates the transmission signal) to the neighboring access point after the DRS transmission mode is updated.
  • Step 4 The UE performs cell detection, time-frequency tracking, and RRM measurement according to the received DRS signal.
  • the DRS includes PSS/SSS, CRS, and CSI-RS (configurable).
  • PSS/SSS and CRS are used for cell discovery and synchronization
  • CRS and CSI-RS are used for RRM measurements.
  • the embodiment relates to a hybrid mechanism for transmitting DRS (short control signaling (SCS) and idle channel assessment (CCA) combining mechanism), specifically:
  • the LAA may use a short control signaling (SCS) and a clear channel assessment (CCA) combining mechanism in an unlicensed carrier to transmit DRS or other necessary signals.
  • LTE/LAA can pre-establish strict criteria for transmitting signals using SCS before unlicensed carrier occupancy, including defining the period, duration, etc. of these symbols/channels, and meeting the regulatory requirements of ETSI or other countries and regions. If the LAA access point is to send a reference signal to a symbol other than the transmission pattern, the CCA function needs to be performed, and the reference signal can only be transmitted when the channel is idle, and the CCA function needs to be performed once for each transmission.
  • the LTE standard may be limited to 25 ms before the unlicensed carrier is occupied, and the SCS is sent.
  • the duration of each SCS is 1 subframe.
  • a subframe in which an SCS may occur may only be subframe 0, subframe 25, subframe 50, subframe 75, and the like.
  • a LAA access point is ready to send a DRS or other signal/channel, and if it wants to send through the SCS before listening, it can only send on those subframes. It can listen on these subframes before sending, and choose to send DRS on the idle SCS subframe. If the above SCS subframes are all signaled, it can only multiplex these time domain resources to send DRS (if the time domain is the same, the frequency domain is staggered).
  • the CCA function does not need to be performed, and only the occupancy of the SCS subframe needs to be monitored and evaluated before the initial transmission.
  • multiple LAA access points Before transmitting a signal on an SCS subframe, multiple LAA access points can coordinate in multiple aspects of time domain, frequency domain, airspace, and power. For occupied APs, some interference avoidance methods can be performed on these subframes, such as muting.
  • a certain LAA access point is ready to send a DRS, and the above-mentioned DRS subframe 0, subframe 25, subframe 50, subframe 75, etc. are all occupied, or the access point is intended to
  • a smaller period such as 5 ms to transmit DRS, can perform the CCA function, and can only transmit the reference signal when the channel is idle, and the CCA function needs to be performed once for each transmission, and the above SCS subframe does not need to perform the CCA function.
  • the embodiment relates to a mechanism for implementing DRS and other necessary signal transmission by using a channel selection algorithm, specifically:
  • a LAA access point is ready to send DRS, which can select one or several cleanest channels or carriers to send DRS through long-term energy detection and carrier sensing, as priority preemption and transmission.
  • the set of candidate carriers for the service, while the DRS is not sent on other carriers.
  • the set of carriers that transmit the DRS also serves as a set of carriers that are preferentially contending and used.
  • LAA access points there are five neighboring LAA access points, which are AP1, AP2, AP3, AP4, and AP5. These five LAA access points support multiple unlicensed carrier transmissions. There are 20 unlicensed carriers available, which are UCC1, UCC2, ..., UCC20 (in fact, there may be as many as 24 20M unlicensed carriers in the 5G spectrum).
  • AP1, AP2, AP3, AP4, and AP5 can select one or several cleanest channels or carriers to transmit DRS through long-term energy detection and carrier sensing, as a candidate carrier for preferential preemption and transmission services, and on other carriers. Do not send DRS.
  • the DRS and other necessary signals may be transmitted using CCA or in combination with methods in other embodiments.
  • This embodiment relates to a new frame format or a transmission pattern, specifically:
  • the unlicensed carrier In order to use the unlicensed carrier to transmit data and improve the spectrum utilization efficiency of the unlicensed carrier, it is necessary to further solve the problem of unlicensed carrier fine synchronization and CSI fast acquisition. question. If the problem of fine synchronization and fast CSI acquisition is to be solved, it is preferable to transmit downlink reference signals, such as CRS and CSI-RS, in a period of 5 ms to 10 ms, in the first few subframes occupying the unlicensed carrier. This is bursty, unlike DRS periodic regular transmission for effects such as coarse synchronization. DRS long-period transmission cannot maintain fine synchronization and channel condition measurement, and if DRS short-cycle intensive transmission violates the unlicensed carrier usage control requirements. Before being used for non-authorization, it can only be sent through the short control signaling SCS. Otherwise, it does not meet the LBT regulatory requirements, and it will also interfere with the competition and use of other devices, and does not conform to the principle of friendly coexistence.
  • downlink reference signals
  • a part of the SCS control duration can be divided for fine synchronization and CSI fast acquisition.
  • a reference signal of 1 ms for transmitting fine synchronization and CSI measurement such as CRS and CSI-RS, is allocated in the 2.5 ms SCS available duration in the 50 ms observation period.
  • CRS can be used for AGC and fine synchronization (time-frequency tracking), and CSI-RS is used for CSI measurement and feedback.
  • Other durations (such as 1.5ms) can be used for signals such as DRS to be transmitted using SCS before occupying an unlicensed carrier.
  • b Define a new frame format, and define one or several OFDM symbols as SCS symbols before or after the CCA for transmitting reference signals such as CRS and CSI-RS.
  • the purpose of transmitting these reference signals is to perform AGC, time-frequency synchronization and CSI measurements. Sending these reference signals with SCS symbols does not require performing CCA functions.
  • FBE Frame-based Equipment
  • LBE Load-based Equipment
  • FBE has strict frame format requirements, including carrier occupancy period and idle period. At the end of the idle period, it is divided into CCA durations.
  • the carrier idle period cannot exceed or exceed the regulatory requirements (for example, the European limit is 1ms to 10ms).
  • the carrier idle period is further divided into: SCS symbols Duration, CCA duration, and remaining idle period.
  • the carrier idle period also needs to meet regulatory requirements (for example, Europe is not less than 5% of the carrier occupancy duration).
  • the symbol occupied by the carrier idle period can be designed at the front end of the subframe or frame; it can also be designed at the end of the subframe or frame; or the partial idle period symbol can be designed at the front end of the subframe or frame, and another part of the idle period symbol is designed at The end of a subframe or frame.
  • the SCS symbol can be placed before the CCA or after the CCA, preferably before the CCA. Regardless of the location of the SCS symbol, there is no need to perform a CCA function to transmit a reference signal using the SCS symbol.
  • the entire unlicensed carrier can be set to use a fixed frame period of 10 LTE subframes, that is, 10 ms.
  • the carrier idle period shall not be less than 5% of the carrier occupation duration. Therefore, it may be assumed that the carrier occupation duration is X OFDM symbols, and the carrier idle duration is Y OFDM symbols. There is the following formula:
  • the carrier idle period is set at the front end of the fixed frame, occupying symbols 0 to 6.
  • Symbol 0 and symbol 1 are SCS symbols and occupy a duration of about 140 us. It should be noted that the SCS occupation time needs to meet the SCS control requirement, that is, the short signaling transmission duty of the adaptive device does not exceed 5%, that is, 2.5 ms, within the observation period of 50 ms.
  • Symbols 2 through 5 are other idle periods.
  • Symbol 6 is the CCA duration, used for idle channel estimation, for interception and contention of unlicensed carriers. If the listening result is idle, the remainder of the fixed frame as shown can be occupied by the device.
  • the SCS symbol is used to transmit reference signals such as CRS and CSI-RS, and is used for performing AGC, time-frequency synchronization, and CSI measurement.
  • each LAA access point can do so without the need to perform the LBT/CCA mechanism.
  • the LAA access point competing for the resource can quickly send the service without spending a lot of time on relevant steps such as AGC, coarse synchronization, fine synchronization, and CSI measurement, which improves the LAA utilization.
  • the spectrum efficiency of the weight carrier transmission service is used to transmit reference signals such as CRS and CSI-RS, and is used for performing AGC, time-frequency synchronization, and CSI measurement.
  • the SCS symbol, the CCA symbol, the carrier occupation period, the carrier idle period, the fixed frame, and the like in the frame format have a large occupation time and a specific position.
  • the SCS part has a large occupation time and a specific position.
  • CASDL Carrier Aggregation Supplemental Downlink
  • CA DL+UL Carrier Aggregation Downlink and Uplink spectrum aggregation downlink and uplink
  • Standalone Standalone deployment
  • SDL and DL+UL are the current mainstream methods. Therefore, for pure downlink transmission and similar TDD transmission, there are many possibilities for the duration of the SCS symbol, the CCA symbol, the carrier occupation period, the carrier idle period, the fixed frame, and the like in the frame format. For example, based on a similar TDD method, the SCS symbol can be combined with the structure of a special subframe (DwPTS, GP, UpPTS) to design.
  • DwPTS special subframe
  • the SCS duration has regulatory requirements, there are generally only a few symbols for SCS transmission in a fixed frame. If the CRS and CSI-RS time-frequency formats of the current LTE standard are used, it may be difficult to transmit the two reference signals within several symbols, for example, the CRS of the current time-frequency format cannot be transmitted within one or two SCS symbols. CSI-RS.
  • the first is to design the appropriate number of SCS symbols, the disadvantage is limited by regulatory requirements.
  • the second is to modify the existing format of the reference signal, or to redesign a reference signal for fine synchronization and measurement.
  • the time-frequency format of CRS and CSI-RS needs to be modified.
  • the symbols appearing in CRS are: symbol 0, symbol 4, symbol 7 , symbol 11. It can be modified to transmit the CRS in the manner of symbol 0 and symbol 3 in the manner of the previous symbols 0 and 4.
  • the RE of the CSI-RS can be designed with the symbol 1 and the symbol in the first time slot. No. 2.
  • This embodiment relates to a new frame format or a transmission pattern, specifically:
  • the unlicensed carrier In order to use the unlicensed carrier to quickly transmit data and improve the spectrum utilization efficiency of the unlicensed carrier, it is necessary to further solve the problem of unlicensed carrier fine synchronization and CSI fast acquisition. If the problem of fine synchronization and fast CSI acquisition is to be solved, it is preferable to transmit downlink reference signals, such as CRS and CSI-RS, in a period of 5 ms to 10 ms, in the first few subframes occupying the unlicensed carrier. This is bursty, unlike DRS periodic regular transmission for effects such as coarse synchronization. DRS long-period transmission cannot maintain fine synchronization and channel condition measurement, and if DRS short-cycle intensive transmission violates the unlicensed carrier usage control requirements. Before being used for non-authorization, it can only be sent through the short control signaling SCS. Otherwise, it does not meet the LBT regulatory requirements, and it will also interfere with the competition and use of other devices, and does not conform to the principle of friendly coexistence.
  • downlink reference signals such
  • a part of the SCS control duration can be divided for fine synchronization and CSI fast acquisition.
  • a reference signal of 1 ms for transmitting fine synchronization and CSI measurement such as CRS and CSI-RS, is allocated in the 2.5 ms SCS available duration in the 50 ms observation period.
  • CRS can be used for AGC and fine synchronization (time-frequency tracking), and CSI-RS is used for CSI measurement and feedback.
  • Other durations (such as 1.5ms) can be used for signals such as DRS to be transmitted using SCS before occupying an unlicensed carrier.
  • b Define a new frame format, and define one or several OFDM symbols as SCS symbols before or after the CCA for transmitting reference signals such as CRS and CSI-RS.
  • the purpose of transmitting these reference signals is to perform AGC, time-frequency synchronization and CSI measurements. Sending these reference signals with SCS symbols does not require performing CCA functions.
  • the symbol position of the SCS may be at the beginning of the frame, at the end of the frame, before the CCA, or after the CCA, and not necessarily adjacent to the CCA.
  • FBE Frame-based Equipment
  • LBE load-based equipment
  • FBE has strict frame format requirements, including carrier occupancy period and idle period. At the end of the idle period, it is divided into CCA durations.
  • the carrier occupancy period can have multiple meanings:
  • the first meaning of the carrier occupation period is that for a specific device, after a device evaluates a channel/carrier by a similar method such as LBT or CCA, it finds a period of time when the channel is idle or available and successfully occupied. If the device finds that the channel/carrier is not available or does not occupy the channel/carrier, the duration of the device is the non-occupied period of the device.
  • the SCS generally refers to a special period of time or segments that occurs during the non-occupation period of the device, that is, the short signaling is forcibly transmitted without obtaining the right to use through the LBT or CCA. However, the length or duration of the SCS itself can be counted in the carrier occupation time (or the carrier occupation period). It can also be counted in the carrier non-occupation duration, which can be understood.
  • the carrier occupation period is that, for the frame format, a segment defined by the frame format is used for a plurality of devices to compete for the duration of the occupation.
  • each device in the occupation period needs to evaluate or compete for the channel/carrier through a similar method such as LBT or CCA, and find that the channel is idle or available before it can be occupied.
  • the carrier occupation period on the frame format may be the occupation period of the device (the device competes for resources), or it may be the non-occupancy period of the device (the device does not compete for resources).
  • SCS does not need to obtain usage rights through LBT or CCA.
  • the length or duration of the SCS itself can be counted in the carrier occupation time (or the carrier occupation period). It can also be counted in the carrier non-occupancy duration (or carrier idle period).
  • the carrier idle period cannot exceed or exceed the regulatory requirements (for example, the European limit is 1ms to 10ms).
  • the carrier idle period is further divided into: CCA duration and remaining idle period.
  • the carrier idle period also needs to meet regulatory requirements (for example, Europe does not Less than 5% of the carrier occupancy time).
  • the symbol occupied by the carrier idle period can be designed at the front end of the subframe or frame; it can also be designed at the end of the subframe or frame; or the partial idle period symbol can be designed at the front end of the subframe or frame, and another part of the idle period symbol is designed at The end of a subframe or frame.
  • the SCS symbol can be placed before the CCA, or after the CCA, and not necessarily adjacent to the CCA symbol, preferably before the CCA. Regardless of the location of the SCS symbol, there is no need to perform a CCA function to transmit a reference signal using the SCS symbol.
  • the following is an example in which the SCS duration is considered to be part of the carrier occupancy period.
  • the entire unlicensed carrier can be set to use a fixed frame period of 10 LTE subframes, that is, 10 ms.
  • the carrier idle period shall not be less than 5% of the carrier occupation duration. Therefore, it may be assumed that the carrier occupation duration is X OFDM symbols, and the carrier idle duration is Y OFDM symbols. There is the following formula:
  • the SCS duration can be considered as part of the carrier idle period or carrier idle duration, and can also be considered as part of the carrier occupation period or carrier occupation duration. If the SCS duration is considered to be part of the carrier idle duration, the carrier idle period including the SCS duration is at least 7 symbols, as in Embodiment 5; if the SCS duration is considered to be part of the carrier occupation duration, the carrier without the SCS duration is not included.
  • the idle time is at least 7 symbols.
  • the SCS symbol sends short signaling and may not perform LBT or CCA.
  • the front end of the frame, symbol 0 and symbol 1 is the SCS symbol and takes up about 140 us. Need Note that the SCS occupancy time needs to meet the SCS control requirements (countries may be inconsistent). For example, within a 50ms observation period, the short signaling transmission duty cycle of the adaptive device does not exceed 5%, which is 2.5ms.
  • the carrier idle period is set at the front end of the fixed frame, occupying symbols 2 through 8. Symbols 2 through 7 are other idle periods. Symbol 8 is the CCA duration, used for idle channel estimation, for interception and contention of unlicensed carriers. If the listening result is idle, the remainder of the fixed frame as shown can be occupied by the device.
  • the SCS symbol is used to transmit reference signals such as CRS and CSI-RS and necessary short signaling, and is used for performing AGC, time-frequency synchronization, and CSI measurement.
  • each LAA access point can do so without the need to perform the LBT/CCA mechanism.
  • the LAA access point competing for resources can quickly send services without spending a lot of time on related steps such as AGC, coarse synchronization, fine synchronization, and CSI measurement, which improves the LAA utilization non-authorization.
  • the spectrum efficiency of the carrier transmission service is used to transmit reference signals such as CRS and CSI-RS and necessary short signaling, and is used for performing AGC, time-frequency synchronization, and CSI measurement.
  • the SCS symbol, the CCA symbol, the carrier occupation period, the carrier idle period, the fixed frame, and the like in the frame format have a large occupation time and a specific position.
  • the SCS part has a large occupation time and a specific position.
  • CASDL Carrier Aggregation Supplemental Downlink
  • CA DL+UL Carrier Aggregation Downlink and Uplink spectrum aggregation downlink and uplink
  • Standalone Standalone deployment
  • SDL and DL+UL are the current mainstream methods. Therefore, for pure downlink transmission and similar TDD transmission, there are many possibilities for the duration of the SCS symbol, the CCA symbol, the carrier occupation period, the carrier idle period, the fixed frame, and the like in the frame format. For example, based on a similar TDD method, the SCS symbol can be combined with the structure of a special subframe (DwPTS, GP, UpPTS) to design.
  • DwPTS special subframe
  • the SCS duration has regulatory requirements, there are generally only a few symbols for SCS transmission in a fixed frame. If the CRS and CSI-RS time-frequency formats of the current LTE standard are used, it may be difficult to transmit the two reference signals within several symbols, for example, the CRS of the current time-frequency format cannot be transmitted within one or two SCS symbols. CSI-RS.
  • the first is to design the appropriate number of SCS symbols, the disadvantage is limited by regulatory requirements.
  • the second is to modify the existing format of the reference signal, or to redesign a reference signal for fine synchronization and measurement.
  • the time-frequency format of CRS and CSI-RS needs to be modified.
  • the symbols appearing in CRS are: symbol 0, symbol 4, symbol 7 , symbol 11. It can be modified to transmit the CRS in the manner of symbol 0 and symbol 3 in the manner of the previous symbols 0 and 4.
  • the RE of the CSI-RS can be designed with symbols 1 and 2 in the first time slot.
  • the unlicensed carrier usage is the SDL (Carrier Aggregation Supplemental Downlink) or the DL+UL (Downlink and Uplink spectrum aggregation downlink and uplink) mode
  • the access point competes for the unlicensed carrier
  • the measurement signal CSI-RS or CRS By transmitting the measurement signal CSI-RS or CRS and then based on the 4ms delay of the UE measurement feedback, it will make it difficult for the eNB to obtain and use CSI within the current occupied time, for example, Japan has a maximum occupancy time of 4ms. Therefore, the uplink SRS or the like can be sent by the UE, and it is a feasible method for the access point to obtain the downlink CSI through channel reciprocity.
  • the CSI measurement feedback delay problem may be reduced by sending the SRS in advance.
  • the UE may periodically send the SRS through the SCS, similar to the periodic DRS transmission, as in Embodiment 1 to Embodiment 4,
  • the SRS may be transmitted on a preset resource before occupying the unlicensed carrier, as in Embodiments 5 and 6, for example, sending SRS (single or multiple transmissions) by using SCS in one subframe or several subframes before occupying the unlicensed carrier. This is different from the periodic law of DRS used for the maintenance of coarse synchronization. send.
  • the access point After receiving the SRS sent by the UE, the access point obtains the downlink CSI based on the channel dissimilarity, so that the data is quickly scheduled after occupying the unlicensed carrier, and the 4 ms delay of the UE measurement feedback is avoided.
  • Each of the above units may be implemented by a central processing unit (CPU), a digital signal processor (DSP), or a field-programmable gate array (FPGA) in an electronic device.
  • CPU central processing unit
  • DSP digital signal processor
  • FPGA field-programmable gate array
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. Instructions are provided for implementation The steps of a function specified in a block or blocks of a flow or a flow and/or a block diagram of a flow chart.
  • the method and device for transmitting a signal according to the embodiment of the present invention are applied to a LAA access point or a LAA base station, and specifically, determining configuration information for transmitting a signal by using a short control signaling SCS during an unlicensed carrier non-occupation period;
  • the configuration information is sent using the SCS.
  • the embodiment of the present invention implements signal transmission before occupying an unlicensed carrier, and can improve spectrum utilization efficiency and performance of the LAA system.

Abstract

L'invention concerne un procédé et appareil de transmission de signal qui peuvent être utilisés au niveau d'un point d'accès LAA ou d'une station de base LAA. Le procédé consiste à : déterminer des informations de configuration afin de transmettre un signal à l'aide d'une signalisation de commande courte (SCS) dans une période d'inoccupation de porteuses non autorisées ; et transmettre le signal à l'aide de la SCS selon les informations de configuration déterminées. Les modes de réalisation de la présente invention permettent de réaliser une transmission de signal avant l'occupation d'une porteuse non autorisée et d'améliorer l'efficacité et les performances d'utilisation de spectre de fréquence d'un système LAA.
PCT/CN2015/089872 2015-01-27 2015-09-17 Procédé et appareil de transmission de signal WO2016119470A1 (fr)

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CN201510040772.2A CN105991254A (zh) 2014-11-07 2015-01-27 一种信号发送方法和装置

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115038127A (zh) * 2022-06-02 2022-09-09 中国电信股份有限公司 资源调度方法及装置、存储介质和电子设备
WO2022213942A1 (fr) * 2021-04-06 2022-10-13 展讯通信（上海）有限公司 Procédé de réception de bloc de signaux de synchronisation et dispositif électronique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102202028A (zh) * 2010-03-26 2011-09-28 北京邮电大学 离散频谱条件的认知高速无线通信系统设计方法
CN102917456A (zh) * 2011-08-02 2013-02-06 华为技术有限公司 一种通信方法、多模终端和基站及系统
CN103580840A (zh) * 2012-08-10 2014-02-12 捷讯研究有限公司 未授权频带中的td lte辅分量载波
CN104301273A (zh) * 2014-08-25 2015-01-21 中兴通讯股份有限公司 使用非授权载波发送及接收信号的方法、基站及用户设备

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102202028A (zh) * 2010-03-26 2011-09-28 北京邮电大学 离散频谱条件的认知高速无线通信系统设计方法
CN102917456A (zh) * 2011-08-02 2013-02-06 华为技术有限公司 一种通信方法、多模终端和基站及系统
CN103580840A (zh) * 2012-08-10 2014-02-12 捷讯研究有限公司 未授权频带中的td lte辅分量载波
CN104301273A (zh) * 2014-08-25 2015-01-21 中兴通讯股份有限公司 使用非授权载波发送及接收信号的方法、基站及用户设备

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022213942A1 (fr) * 2021-04-06 2022-10-13 展讯通信（上海）有限公司 Procédé de réception de bloc de signaux de synchronisation et dispositif électronique
CN115038127A (zh) * 2022-06-02 2022-09-09 中国电信股份有限公司 资源调度方法及装置、存储介质和电子设备
CN115038127B (zh) * 2022-06-02 2023-09-26 中国电信股份有限公司 资源调度方法及装置、存储介质和电子设备

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