Source: https://patents.google.com/patent/CN106664659A/en
Timestamp: 2020-02-17 09:37:29
Document Index: 164974542

Matched Legal Cases: ['application No.14', 'art 400', 'art 500', 'art 1300', 'art 1300', 'art 1800', 'art 1800']

CN106664659A - Medium access control in LTE-U - Google Patents
CN106664659A
CN106664659A CN201580048115.0A CN201580048115A CN106664659A CN 106664659 A CN106664659 A CN 106664659A CN 201580048115 A CN201580048115 A CN 201580048115A CN 106664659 A CN106664659 A CN 106664659A
CN201580048115.0A
埃斯沃·武图库里
2014-09-09 Priority to US14/481,808 priority
2015-09-08 Application filed by 黑莓有限公司 filed Critical 黑莓有限公司
2017-05-10 Publication of CN106664659A publication Critical patent/CN106664659A/en
In some implementations, a medium access control (MAC) method for LTE in unlicensed (LTE-U) includes transmitting at least one of a clear to send (CTS) message or a request to send (RTS) message on an LTE-U secondary cell (SCell) carrier. The at least one of the CTS message or the RTS message may include a duration field. The duration field may indicate the transmission time of a transmission on a packet data shared channel on the LTE-U SCell carrier. An evolved NodeB (eNB) transmits a scheduling grant for the transmission on the packet data shared channel on the LTE-U SCell carrier.
Media access control in LTE-U
This application claims the U.S. Patent application No.14/481 that September in 2014 is submitted on the 9th, 808 priority, its whole Content is incorporated herein by.
It relates to the data transfer in communication system, more particularly, to the matchmaker for unauthorized LTE (LTE-U) Body access control (MAC).
In the wireless communication system of such as third generation partner program (3GPP) Long Term Evolution (LTE) system, MAC associations View layer determines whether transfer resource can use.The mechanism of this determination transmission opportunity of MAC protocol is referred to as scheduling.For descending chain Road (DL) transmit, the MAC layer scheduler in evolution NodeB (eNB) can decide when to user equipment (UE) send one or Multiple DL packets.ENB can send DL scheduling grants on physical downlink control channel (PDCCH) to UE, to indicate to use In the DL channel resources of transmission.For up-link (UL) transmission, UE can ask the resource for UL transmission.The MAC layer of eNB Interior UL schedulers may decide which UE can be provided with Internet access UL channels in any given Transmission Time Interval (TTI) Source.ENB can send UL scheduling grants on PDCCH to UE, to indicate the UL channel resources for transmission.
Wireless communication system (such as LTE system) can also be come in reduction system using discontinuous (DRX) process that receives The battery power consumption of UE.For example, eNB can be configured to UE to operate in DRX configuration modes by sending DRX configurations to UE. DRX configurations can include one or more parameters, to indicate when UE can activate its receiver and monitor subframe to determine The presence of the DL or UL license on PDCCH.In some cases, UE can activate its receiver and monitor the time quilt of PDCCH Referred to as DRX activity times.In some cases, DL or UL licenses are referred to as DL or UL appointments.During other subframes, UE can be with Close its receiver to reduce power consumption.In some cases, these subframes are referred to as DRX inactive times.DRX configuration parameter can With including one or more intervalometers.The DRX mode and dutycycle of DRX activity times and DRX inactive times can be based on number Change according to activity and one or more intervalometers.For example, DRX configuration parameter can include DRX non-active timers, and it can be with It is arranged to initial value, then restarts whenever the scheduling grant for UL or DL is received.When DRX non-active timers When being currently running, such as during the DRX activity times, UE can actively monitor all DL subframes.When the DRX non-active timer phases When full (this can indicate to be assigned without any new UL or DL within the time period of definition), the monitoring mode of UE will change, and And UE can only monitor less subframe, and close for remaining downlink subframe its receiver part or all, To reduce its battery consumption.ENB can send DRX configuration parameter using wireless heterogeneous networks (RRC) message.
Fig. 1 shows the example wireless communication system 100 of the operation in LTE-U.
Fig. 2 shows the sample data flow graph using the DRX configuration switchings of MAC signalings.
Fig. 3 shows the sample data flow graph using the DRX configuration switchings of RRC signaling.
Fig. 4 shows the flow chart of the method that switching is configured for DRX.
Fig. 5 shows the example flow diagram of Listen Before Talk (LBT) scheme for LTE-U.
Fig. 6 shows the schematic diagram of the cross-carrier dispatching method of example that eNB is carried out.
Fig. 7 shows the schematic diagram of the cross-carrier dispatching method of example for UE.
Fig. 8 shows the schematic diagram for processing the exemplary method of the conflict on LTE-U secondary cells (SCell) carrier wave.
Fig. 9 shows the sample data flow graph of the channel sweep-out method for DL transmission of eNB.
Figure 10 shows the sample data flow graph for transmitting the timing relationship for removing channel with regard to DL of eNB.
Figure 11 shows the sample data flow graph of the channel sweep-out method for UL transmission of eNB.
Figure 12 shows the sample data flow graph for transmitting the timing relationship for removing channel with regard to UL of eNB.
Figure 13 shows the flow chart of the channel sweep-out method that eNB is carried out.
Figure 14 shows the sample data flow graph of the channel evaluation method for UL transmission of UE.
Figure 15 shows the sample data flow graph of the channel sweep-out method for UL transmission of UE.
Figure 16 shows the sample data flow graph of the channel sweep-out method for UL transmission of both UE and eNB.
Figure 17 shows the example data flow of the channel evaluation method transmitted for the UL based on semi-static license of UE Figure.
Figure 18 shows the flow chart of the channel evaluation method of UE.
Figure 19 shows the schematic block diagram of exemplary user equipment.
Figure 20 shows the schematic block diagram of example base station.
It relates to the media access control (MAC) in unauthorized LTE (LTE-U).Many methods are sought by operator Solve the problems, such as spectrum shortage.Effectively it is probably the solution of this problem using unlicensed spectrum.For example, can award non- The modification of LTE technologies used in frequency spectrum is weighed to coexist with other wireless devices (such as 801.11 equipment).The technology can be claimed Supplementary access (LAA-LTE) is authorized for unauthorized LTE (LTE-U) or LTE.
In LTE-U, eNB and UE can send and receive data using carrier aggregation (CA) on LTE-U carrier waves.In CA In, simultaneously the data for going into or from same UE can be sent using two or more component carriers (CC).When next with CA During configuration UE, UE can have one and be connected with the RRC of eNB.ENB can configure main plot (PCell) carrier wave and one for UE Or multiple secondary cell (SCell) carrier waves.In some cases, eNB can send scheduling grant using cross-carrier scheduling to UE. For example, eNB can send UL licenses or DL licenses on the PDCCH of PCell carrier waves, to dispatch the transmission of the UL on SCell carrier waves Or DL transmission.SCell carrier waves can be indicated with the multi-carrier indicator field (CIF) in UL licenses or DL licenses.In LTE-U In, eNB can configure PCell carrier waves in frequency spectrum is authorized for UE.For example, PCell carrier waves can be possessed using operator The LTE carrier waves of LTE frequency spectrums.ENB can configure SCell carrier waves for UE in an unlicensed spectrum.For example, SCell carrier waves can be Using the LTE-U carrier waves of unlicensed spectrum.
Fig. 1 is the example wireless communication system 100 for illustrating the operation in LTE-U.For example, in a wireless communication system, UE The first discontinuous receive (DRX) can be received from evolution NodeB (eNB) to configure.When UE is operated in DRX configurations, UE Can receive from eNB and indicate that the DRX configuration switchings for being switched to the 2nd DRX configurations are indicated.In some implementations, DRX configurations switching Indicate that the switching between two existing configurations can be indicated.Alternatively or in combination, DRX configurations switching instruction can be indicated with newly Existing configuration is replaced in configuration.Receive DRX configuration switchings after load change that can be in LTE-U SCell carrier waves to indicate. Some realize in, can be based on LTE-U SCell carrier waves on collision rate, detect on LTE-U SCell carrier waves it is average The change of at least one of energy level or the mean data rate that reaches on LTE-U SCell carrier waves is detecting LTE-U Load in SCell carrier waves changes.Indicate in response to DRX configuration switchings, UE can be switched to the 2nd DRX from DRX configurations Configuration.Other tolerance being associated with the load of unauthorized medium can also be used.For example, can obtain " medium take because Son ", it indicates that medium is confirmed as occupied current or section average time (fraction of time).In a realization In, the whether occupied determination of medium can be based on the reception signal at least a portion of unlicensed frequency band or carrier wave or interference The comparison of level and threshold value.In this case, if receipt signal level exceedes threshold value, can be by medium classification " busy ", is " not being in a hurry " otherwise by medium classification.May then based on ratio of the busy during observation period and carry out calculation medium and account for Use the factor.It should be appreciated that it is also feasible to determine that medium takes other methods of the factor, including being not entirely dependent on medium two Unit is categorized as those busy or not busy methods.In these methods, it can be estimated that the reception signal in unlicensed band or carrier wave Or distribution or the time history of interference level, and the medium occupancy factor is obtained accordingly.
In some implementations, DRX configuration switchings can be received in media access control (MAC) control unit (CE) to refer to Show.In some implementations, DRX configurations switching instruction can be included in wireless heterogeneous networks (RRC) connection reconfiguration message. During some are realized, RRC connections reconfiguration message can include the parameter being associated with the 2nd DRX configurations.In some implementations, exist Pre-configured DRX configurations and the 2nd DRX configurations at UE.In some implementations, reconfiguration message is connected using RRC pre- at UE Configure DRX configurations and the 2nd DRX configurations.
In some implementations, eNB can send DRX configurations so that UE is operated in a DRX configuration modes.eNB Can determine that the load in LTE-U SCell carrier waves changes.Based on the determination, eNB can send instruction and be switched to the 2nd DRX and match somebody with somebody The DRX configuration switchings put are indicated so that UE is operated in the 2nd DRX configuration modes.
In some implementations, eNB can send clear to send (CTS) message on LTE-U SCell carrier waves or request is sent out Send at least one of (RTS) message.In CTS message or RTS message described at least one can include Duration field. Duration field can indicate the transmission time of the transmission in the grouped data shared channel on LTE-U SCell carrier waves. ENB can be sent for the transmission in the grouped data shared channel during transmission time on LTE-U SCell carrier waves Scheduling grant.In some implementations, scheduling grant can indicate that physical down link sharing channel (PDSCH) is transmitted, and eNB PDSCH subframes can be sent during transmission time.In some implementations, scheduling grant can indicate the physical uplink that UE is carried out Link shared channels (PUSCH) are transmitted, and eNB can receive up-link (UL) transmission request and in the transmission time phase from UE Between from UE receive PUSCH subframes.
In some implementations, UE can receive UL licenses from eNB, and the UL permits indicator in one or more subframes The license of PUSCH transmission of the period on LTE-U SCell carrier waves.In some implementations, UL can be received on PDCCH to be permitted Can.In some implementations, UL licenses are received on Long Term Evolution (LTE) main plot (PCell) carrier wave.In some implementations, UL License is the semi-static UL licenses for using RRC information configuration.In some implementations, UL licenses are dynamic UL licenses.In some realities In existing, UE can send at least one of CTS message or RTS message on LTE-U SCell carrier waves.CTS message or RTS disappear In breath described at least one can include Duration field.Duration field can indicate transmission time.UE can be true Whether LTE-U SCell carrier waves can be used to transmit during being scheduled on one or more subframes.In some implementations, UE is based on and measures Signal level on LTE-U SCell carrier waves is determining whether LTE-U SCell carrier waves can be used to transmit.In some implementations, UE determines whether LTE-U SCell carrier waves can be used to transmit based on the signal level less than threshold value is measured.In some realizations In, UE determines whether LTE-U SCell carrier waves are not useable for transmission based on the signal level higher than threshold value is measured.If LTE-U SCell carrier waves can be used to transmit, then UE can send PUSCH subframes on LTE-U SCell carrier waves.If LTE-U SCell carrier waves are not useable for transmission, then UE can prevent to be transmitted on LTE-U SCell carrier waves.In some implementations, when Bound using LTE transmission time interval (TTI) when continuously transmitting more than one subframe, so as to reduce take SCell carrier waves when Between.
According to method described herein and system to operate LTE-U in MAC one or more advantages can be provided.Example Such as, eNB can customize the current DRX configurations of UE based on the load level of LTE-U carrier waves.Therefore, UE can meet data Its battery consumption is reduced while the delay of service is required.In addition, by the pre-test LTE-U carrier wave for determining whether transmission Signal level, UE can be efficiently used unlicensed spectrum when frequency spectrum is idle, while avoiding the conflict sum of frequency spectrum busy According to loss.Additionally, sending CTS or RTS UE or eNB can be enable to reserve the Radio Resource in LTE-U carrier waves, so as to improve number According to the success rate of transmission.
High-level, example wireless communication system 100 includes LTE-U UE 102,802.11 equipment 106 and radio communication Network 110, cordless communication network 110 includes the eNB 104 for communicably coupling with LTE-U UE 102.In the example shown, ENB 104 is with CA configuration LTE-U UE 102.LTE-U UE 102 can send on LTE PCell carrier waves 120 to eNB 104 Or receive from eNB 104.LTE-U UE 102 can be sending or from eNB on LTE-U SCell carrier waves 130 to eNB 104 104 receive.In the example shown, LTE-U SCell carrier waves 130 are operated in an unlicensed spectrum.
In the example shown, LTE-U UE 102 receive the first discontinuous receive (DRX) and configure from eNB 104.Work as LTE-U When UE 102 is operated in DRX configurations, loads of the LTE-UUE 102 in LTE-U SCell carrier waves 130 change after from ENB 104 receives DRX configuration switchings and indicates.DRX configuration switchings indicate that instruction is switched to the 2nd DRX configurations.In response to DRX configurations Switching indicates that LTE-U UE 102 are switched to the 2nd DRX configurations from DRX configurations.Fig. 2 to Fig. 4 and associated description There is provided the more details that these are realized.In some replacement schemes, LTE-U UE can be during the initial connection establishment stage Multiple DRX configurations are received, and each DRX configuration has index.
In some instances, eNB 104 sends clear to send on LTE-U SCell carrier waves 130 to 802.11 equipment 106 (CTS) message or request sends (RTS) message 142.CTS message or RTS message 142 include Duration field.Persistent period Field indicates the transmission time of the transmission in the grouped data shared channel on LTE-U SCell carrier waves 130.ENB 104 sends For the scheduling grant of the transmission in the grouped data shared channel during transmission time on LTE-U SCell carrier waves 130. The additional detail that Fig. 5 to Figure 13 and associated description are realized there is provided these.
In some instances, LTE-U UE 102 receive UL licenses from eNB 104.UL permits indicator to one or more The license of the PUSCH transmission during subframe on LTE-U SCell carrier waves 130.In some implementations, LTE-U UE 102 exist CTS or RTS message 144 is sent on LTE-U SCell carrier waves 130 to 802.11 equipment 106.CTS or RTS message 144 includes holding Continuous time field.Duration field indicates transmission time.LTE-U UE 102 are determined during one or more subframes Whether LTE-U SCell carrier waves 130 can be used to transmit.If LTE-U SCell carrier waves 130 can be used to transmit, LTE-U UE 102 send PUSCH subframes on LTE-U SCell carrier waves 130.If LTE-U SCell carrier waves 130 are not useable for transmission, LTE-U UE 102 prevent to be transmitted on LTE-U SCell carrier waves 130.Figure 14 to Figure 18 and associated description are provided These additional details realized.
Go to the general description to element, user equipment can be referred to as mobile electronic device, user equipment, mobile station, Subscriber stations, portable electric appts, mobile communication equipment, radio modem or wireless terminal.Example (such as LTE- of UE U UE 102) the personal meter of cell phone, personal digital assistant (PDA), smart phone, laptop computer, flat board can be included Calculation machine (PC), pager, portable computer, portable game device, can wearing electronic equipment or with for via channel radio Communication network transmits other mobile communication equipments of the component of voice or data.Cordless communication network can be included in mandate frequency spectrum or Wireless link in unlicensed spectrum.
Other examples of UE include but is not limited to television set, remote control, Set Top Box, computer monitor, computer (bag Include tablet PC, desk computer, hand-held or laptop computer, netbook computer), microwave oven (microwave), ice Case, stereophonic sound system, magnetic tape recorder or player, DVD player or recorder, CD Player or recorder, VCR, MP3 broadcast Put device, radio, Video Camera, video camera, digital camera, portable storage chip, washing machine, dehydrator, laundry/drying Machine, photocopier, facsimile machine, scanner, multi-function peripheral, watch, clock and game station etc..UE can include equipment and Removable memory module, such as including subscriber identity module (SIM) application, Universal Subscriber Identity module (USIM) application or removable Unload the Universal Integrated Circuit Card (UICC) of Subscriber Identity Module (R-UIM) application.Term " UE " can also be referred to can be terminated using Any hardware or component software of the communication session at family.Additionally, term " subscriber's installation ", " UE ", " user equipment devices ", " use Family agency ", " UA ", " user equipment " and " mobile device " can be used synonymously herein.
Wireless communication system 110 can include one or more wireless access networks (RAN), core net (CN) and extranets Network.RAN can include one or more wireless access technologys.In some implementations, wireless access technology can be global movement Communication system (GSM), interim standard 95 (IS-95), Universal Mobile Telecommunications System (UMTS), CDMA2000 (CDMA), drill Enter Universal Mobile Telecommunications System (UMTS), Long Term Evolution (LTE), senior LTE.In some instances, core net can be evolution Block core (EPC).
RAN be mobile communication system realize wireless access technology (such as UMTS, CDMA2000,3GPP LTE and 3GPP LTE-A) part.In numerous applications, RAN includes at least one eNB 104.ENB 104 can be in system Standing part in control all or at least some wireless related function wireless base station.ENB 104 can be in its area of coverage There is provided wave point to be communicated for LTE-U UE 102 in domain or cell.ENB104 can be dispersed throughout whole cellular network with Wide overlay area is provided.ENB 104 directly communicates with one or more UE, other base stations and one or more core net nodes.
802.11 equipment can be any equipment for operating in an unlicensed spectrum.The example of 802.11 equipment is (for example, 802.11 equipment 106) can include：Cell phone, personal digital assistant (PDA), smart phone, laptop computer, flat board Personal computer (PC), pager, portable computer, portable game device, wearable electronic, access point, access Equipment or with for uploading other mobile communication equipments of the component of sending voice or data in unlicensed spectrum.Unauthorized frequency The example of spectrum can include using the frequency spectrum of the wireless local area network technologies of IEEE 802.11.
Although being described around Fig. 1, the disclosure is not limited to such environment.Generally, wireless communication system The honeycomb that cell is constituted serviced by multiple wireless areas or by base station or other fixed transceivers can be described as Network.Cell is used to cover zones of different to provide the wireless coverage on region.Example wireless communication system includes that the whole world is mobile Communication system (GSM) agreement, Universal Mobile Telecommunications System (UMTS), 3GPP Long Term Evolutions (LTE) etc..Except radio communication system System, Wireless Broadband Communication Systems are readily adaptable for use in the various embodiments described in the disclosure.Example wireless electricity broadband connections System includes the WLANs of IEEE 802.11, IEEE 802.16WiMAX networks etc..
Fig. 2 shows example data flow Figure 200 using the DRX configuration switchings of MAC signalings.In the example shown, eNB 104 communicate with adaptively switching DRX configurations with LTE-U UE 102.In the example shown, eNB 104 is in LTE-U SCell PDCCH used in carrier wave on downlink is dispatching the transmission on LTE-U SCell carrier waves.LTE-U UE 102 are for scheduling PDCCH on license monitoring LTE-U SCell carrier waves.In the example shown, LTE-U UE 102 are configured in DRX mode Operation.Therefore, LTE-U UE 102 monitor the PDCCH on LTE-U SCell carrier waves during DRX is movable.In some implementations, ENB 104 determines whether LTE-U SCell carrier waves are busy.In this case, eNB 104 can be in LTE-U SCell carrier waves Busy does not send DL packets or scheduling grant.
In step 210, eNB 104 to LTE-U UE 102 send RRC information.In the example shown, RRC information is RRC Connection reconfigures (RRCConnectionReconfiguration) message.RRC information include for high capacity DRX configuration and DRX for low-load is configured.In some alternate ways, RRC information can be configured including more than two DRX.For high negative The DRX configurations of load include UE can be made more to keep waking up the parameter of (that is, the PDCCH monitored in downlink).For example, use Can include that shorter DRX cycle, longer non-active timer, longer work (ON) continue in the DRX configurations of high capacity Time timer etc..DRX configurations for low-load include UE can be made more to keep dormancy so as to reduce the ginseng of UE power consumptions Number.For example, the DRX configurations for low-load can include longer DRX cycle, shorter non-active timer, longer work Make (ON) duration timer etc..
In step 220, LTE-U UE 102 are reconfigured to the transmission RRC connections of eNB 104 and completed (RRCConnectionReconfigurationComplete) indicating RRCConnectionReconfiguration message It is successfully received.In the example shown, LTE-U UE 102 enter DRX mode using the DRX configurations for high capacity.
In step 230, eNB 104 detects the low-load in unlicensed spectrum (i.e. LTE-U SCell carrier waves).eNB 104 can be based on the load that one or more factors are determined on LTE-U SCell carrier waves.These factors can include LTE-U Collision rate on SCell carrier waves, the averaged energy levels detected on LTE-U SCell carrier waves, in LTE-U SCell carrier waves On the mean data rate that reaches and medium take the factor.When the load on LTE-U SCell carrier waves is low, by LTE-U It is just high that SCell carrier waves obtain the probability for accessing.Therefore, it can meet data industry by using the DRX configurations for low-load The delay of business is required.Therefore, eNB104 sends DRX configuration switchings and indicates to LTE-U UE 102.In some implementations, Ke Yi Send DRX configuration switchings in MAC Control Element (CE) to indicate.LTE-U UE 102 receive DRX configuration switchings and indicate, and from being used for The DRX configurations of high capacity are switched to the DRX configurations for low-load.
In step 240, eNB 104 detects the high capacity on LTE-U SCell carrier waves.In this case, pass through It is relatively low that LTE-U SCell carrier waves obtain the probability for accessing.Therefore, in this case, due to LTE-U SCell carrier waves can not With property, the delay of downlink traffic may be higher.Therefore, eNB 104 sends DRX configuration switchings and refers to LTE-U UE 102 Show.LTE-U UE 102 receive DRX configuration switchings and indicate, and are switched to for high capacity from the DRX configurations for low-load DRX is configured.
In some implementations, eNB 104 can be the configuration more than two DRX configurations of LTE-U UE 102.Therefore, eNB 104 can configure switching using DRX indicates to indicate that LTE-U UE102 are switched to any one pre-configured DRX configuration.The following is The Examples section for switching the specifications of 3GPP TS 36.321 that DRX is configured using MAC CE can be supported.In this example, can be with Pre-configured 8 different DRX configurations, and switched between these configurations using the signaling based on MAC CE.
Index LCID values 00000 CCCH 00001-01010 The mark of logic channel 01011-11000 It is reserved 11001 DRX configuration switchings 11010 Long DRX orders 11011 Activation/deactivation 11100 UE competition resolution marks 11101 Timing advance order 11110 DRX orders 11111 Filling
Table 6.2.1-1 is used for the LCID values of DL-SCH
6.1.3.10DRX configuration switching MAC Control Element
The MAC PDU sub-headers of DRX configurations switching MAC Control Element (CE) LCID by specified in table 6.2.1-1 To identify.It has fixed size, is made up of single eight bit byte, and eight bit byte is defined as follows：
-R：Reserved bit, is set to " 0 "；
- DRX configuration switchings：The field indicates the pre-configured indexes of DRX.The length of the field is 3 bits, in mark UE 8 different DRX are pre-configured.DRX is prewired sets to 0 for the mark of value 0, and value 1 identifies DRX pre-configured 1, by that analogy.
Table 6.2.1-2DRX configuration switching MAC Control Element
Fig. 3 shows example data flow Figure 30 0 using the DRX configuration switchings of RCC signalings.In the example shown, eNB 104 communicate with adaptively switching DRX configurations with LTE-U UE 102.In the example shown, eNB 104 is in LTE-U SCell PDCCH used in carrier wave on downlink is dispatching the transmission on LTE-U SCell carrier waves.As described above, LTE-U UE 102 are configured to be operated in DRX mode, therefore the PDCCH on LTE-U SCell carrier waves is monitored during the DRX activity times.
In step 310, eNB 104 determines that the load on LTE-U SCell carrier waves is relatively low.ENB104 is to LTE-U UE 102 Send RRC information.In the example shown, RRC information is RRCConnectionReconfiguration message.RRC information bag Include the DRX configurations for low-load.In some implementations, eNB 104 can be the pre-configured more than one DRX of LTE-U UE 102 Configuration.
In step 320, LTE-U UE 102 to eNB 104 sends RRCConnectionReconfigurationComple Te is successfully received with indicating RRCConnectionReconfiguration message.LTE-U UE 102 are used for low negative The DRX configurations of load enter DRX mode.
In step 330, eNB 104 detects the high capacity on LTE-U SCell carrier waves.Therefore, eNB 104 is to LTE-U UE 102 sends DRX configuration switchings and indicates.In some implementations, DRX configuration switchings can be sent in RRC information to indicate. In example shown, RRC information is RRCConnectionReconfiguration message.In some implementations, RRC information can be with Including the parameter being associated with the DRX configurations for high capacity.LTE-U UE 102 receive DRX configuration switching indicate, and from The DRX configurations for high capacity are switched in the DRX configurations of low-load.In step 332, LTE-U UE 102 are to eNB 104 Send RRCConnectionReconfigurationComplete.
In step 340, eNB 104 detects the low-load on LTE-U SCell carrier waves.Therefore, eNB 104 is to LTE-U UE 102 sends DRX configuration switchings and indicates.In some implementations, DRX configuration switchings can be sent in RRC information.Shown In example, RRC information is RRCConnectionReconfiguration message.LTE-U UE 102 receive DRX configuration switchings Indicate, and the DRX configurations for low-load are switched to from the DRX configurations for high capacity.In step 342, LTE-U UE 102 RRCConnectionReconfigurationComplete is sent to eNB 104.It is many when being configured with some alternate ways When individual DRX is configured, DRX configuration switchings indicate the index that can include expected DRX configurations.
Fig. 4 shows the flow chart 400 of the method that switching is configured for DRX.The flow chart starts in step 402, its Middle UE receives the first discontinuous receive (DRX) and configures from evolution NodeB (eNB).In some implementations, in step 404, eNB is pre- The 2nd DRX configurations of configuration UE.
In step 406, while UE is just operated in the first DRX configurations, UE receives instruction and is switched to second from eNB The DRX configuration switchings of DRX configurations are indicated.When some conditions occur, such as load in LTE-U SCell carrier waves changes it Afterwards, receive DRX configuration switchings to indicate.In some implementations, eNB can be based on LTE-U SCell carrier waves on collision rate, The averaged energy levels that detect on LTE-U SCell carrier waves, the mean data rate reached on LTE-U SCell carrier waves or Load during medium takes at least one of factor to detect LTE-U SCell carrier waves changes.In some implementations, Ke Yi Receive DRX configuration switchings in media access control (MAC) control unit (CE) to indicate.In some implementations, DRX configurations switching refers to Showing can be included in wireless heterogeneous networks (RRC) connection reconfiguration message.In some implementations, RRC connections reconfiguration message The parameter being associated with the 2nd DRX configurations can also be included.In step 408, indicate in response to DRX configuration switchings, UE is from first DRX configurations are switched to the 2nd DRX configurations.
Fig. 5 shows the example flow diagram 500 of Listen Before Talk (LBT) scheme for LTE-U.LBT schemes can be with Realized by LBT modules in distinct device (for example, eNB 104 or LTE-U UE 102).Flow chart 500 starts from step 510, wherein whether be purged channel estimating (CCA) busy to determine medium.For example, eNB 104 can be passed in downlink Determined whether LTE-U SCell carrier waves are busy before defeated.LTE-U UE 102 can be with the determination before ul transmissions Whether LTE-U SCell carrier waves are busy.In some implementations, LBT modules can monitor LTE-U SCell carrier waves can to determine it The property used.In order to determine whether medium is busy, LBT modules can detect the biography on LTE-U SCell carrier waves using various methods It is defeated.For example, LBT modules can be with the RF energy in detected carrier, 802.11 preamble transmissions on carrier wave, the transmission on carrier wave LTE-U signals or the RADAR/ primary user's signals transmitted on carrier wave.
If medium is busy, in step 512, LBT modules prevent equipment from sending on LTE-U SCell carrier waves.One In a little realizations, if detecting the transmission on LTE-U SCell carrier waves, when LBT modules can wait interFrameGap (IFS) Section.In some implementations, multiple IFS can be defined.For example, (such as request sends (RTS) or clear to send to high priority transfer (CTS)/confirm (ACK) transmission) short IFS (SIFS) can be used.These transmission can occur in SIFS after in the past.For it He transmits, and can access carrier wave based on competition after distributed coordination function (DCF) IFS (DIFS) expires.SIFS can be with It is 10 μ s magnitudes, DIFS can be 50 μ s magnitudes.The value of IFS can change according to the technology used in unlicensed spectrum.This Outward, point coordination function interframe space (PIFS) can be defined.The value of PIFS between DIFS and SIFS, therefore with using DIFS's Equipment is compared, and for channel access slightly higher priority is provided.In some implementations, after the IFS periods (such as DIFS periods), LBT modules can send on the carrier wave before etc. rollback (Backoff) period to be appended.Can be random for backoff period definition The time delay parameter of extraction.After each interval that channel was mourned in silence the DIFS periods, backoff period can successively decrease.At some In realization, prevent the equipment for just completing former sub-frame transmission operation from accessing again too quickly using contention window (CW windows) intervalometer Carrier wave, such as before other equipment has had an opportunity to access carrier wave.
If medium is not in a hurry, in step 514, LBT modules instruction equipment sends on LTE-U SCell carrier waves.Following table Show the example of the interaction between LBT schemes and MAC scheduling decisions.
Table 1：LTE-U LBT schemes dispatch interacting between determining with MAC
Fig. 6 shows the schematic diagram 600 of the cross-carrier dispatching method of example of eNB.Schematic diagram 600 includes LTE PCell Carrier wave 610 and LTE-U SCell carrier waves 640.LTE PCell carrier waves 610 include PDCCH 612 and PDSCH 614.LTE-U SCell carrier waves 640 include PDSCH642.UE1 630, UE2632 and UE3634 are in LTE PCell carrier waves 610 and LTE-U The LTE-U UE operated in SCell carrier waves 640.In the example shown, using cross scheduling, thus UE1 630, UE2632 and UE3634 monitors the PDCCH 612 on LTE PCell carrier waves 610 for the scheduling grant of LTE-U SCell carrier waves 640.Such as Fruit UE is operated in DRX mode, then when UE is in the DRX inactive times on LTE PCell carrier waves, eNB can send tune Degree license.
Fig. 7 shows the schematic diagram 700 of the cross-carrier dispatching method of example for UE.Schematic diagram 700 includes LTE PCell carrier waves 710 and LTE-U SCell carrier waves 720.LTE PCell carrier waves 710 include PDCCH 712 and PDSCH 714. In example shown, UE monitors the PDCCH on LTE PCell carrier waves 710 for the scheduling grant of LTE-U SCell carrier waves 720 712。
Fig. 8 shows the schematic diagram 800 for processing the exemplary method of the conflict on LTE-U SCell carrier waves.Illustrate Figure 80 0 includes LTE PCell carrier waves 810 and LTE-U SCell carrier waves 820.LTE PCell carrier waves 810 are included at subframe #0 PDCCH 812 and PDSCH 814.LTE PCell carrier waves 810 also include PDCCH 822 and PDSCH 824 at subframe #n. LTE-U SCell carrier waves 820 include PDSCH 830 at subframe #n.Because LTE PCell carrier waves 810 are grasped in frequency spectrum is authorized Make, so eNB can not use LBT schemes that scheduling grant or DL data are sent on LTE PCell carrier waves 810.On the other hand, ENB can be sent using LBT schemes on LTE-U SCell carrier waves 820.
In the example shown, eNB is made in subframe #0 and is in LTE PCell carrier waves 810 and LTE-U SCell carrier waves 820 The scheduling of upper transmission is determined.Then, eNB determines that LTE-U SCell carrier waves 820 are unavailable based on LBT schemes.In such case Under, eNB can send on LTE PCell carrier waves 810, and it is included in the scheduling grant on PDCCH 812 and PDSCH 814 DL data.Therefore, the cross-carrier downlink scheduling that UE can be received for LTE-U SCell carrier waves 820 at subframe #0 is permitted Can, but do not receive the transmission of the DL on LTE-U SCell carrier waves 820.UE can be by determining in LTE-U SCell carrier waves 820 On be not received by being addressed to the transmission of the CRNTI of UE and do not have on the LTE-U SCell carrier waves 820 at subframe #0 to determine DL is transmitted.In the example shown, UE can be continuing with downlink subframe monitoring LTE-U SCell carrier waves 820, Zhi Dao Till the subframe for being addressed to UE is received on LTE-U SCell carrier waves 820.UE can with LTE PCell UL to eNB send out HARQ feedback (such as HARQ NACK) is sent, to indicate that UE receives scheduling grant in subframe #0.UE can be non-in DRX Active time continues to monitor DL transmission after expiring.For example, UE can be being received for LTE-U SCell carrier waves 820 Start or restart the intervalometer (such as non-active timer) related to DRX, and if following bar during cross-carrier scheduling grant At least one sets up in part, then continue to monitor LTE-U SCell carrier waves 820：1) DRX intervalometers indicate UE in DRX it is movable when Between, or 2) be also not received by being addressed to the descending of UE after the nearest PDCCH licenses on LTE PCell carrier waves 810 Isl frame.At subframe #n, when eNB detect LTE-U SCell carrier waves 820 it is idle when, eNB can send out on PDCCH 822 Another scheduling grant is given, with the corresponding DL data transfers on the PDSCH 830 for indicating LTE-U SCell carrier waves 820.The following is The Examples section of the specifications of 3GPP TS 36.321 of above-mentioned conflict processing method can be supported.
When DRX circulations are configured, the activity time includes the time when there is the following：
- start duration timer (onDurationTimer) or drx- non-active timers Or drx- retransmission timers (RetransmissionTimer) or mac- contention resolved intervalometers (InactivityTimer) (ContentionResolutionTimer) it is currently running (as described in sub-clause 5.1.5)；Or
- send dispatch request and dispatch request on PUCCH and be in pending (as described in sub-clause 5.4.4)；Or
- the up-link that can occur to be retransmitted for pending HARQ is permitted, and is existed in corresponding harq buffer device Data；Or
- after the accidental access response to the nonoptional lead codes of UE is successfully received, also do not receive to addressing To the PDCCH that the new transmission of the C-RNTI of UE is indicated (as described in sub-clause 5.1.4)；Or
- have been received by indicating the C- cross-carrier schedule downlink subframe, to being addressed to UE on unauthorized carrier wave The PDCCH that the PDCCH of the new transmission of RNTI is indicated, and not yet receive the corresponding biography on the PDSCH of unauthorized carrier wave It is defeated.
Fig. 9 shows example data flow Figure 90 0 of the channel sweep-out method for downlink transmission of eNB.Institute In example, eNB 104 communicates on both LTE PCell carrier waves and LTE-U SCell carrier waves with LTE-U UE 102.In step The transmission on MAC scheduler schedules LTE-U SCell carrier waves in rapid 910, eNB 104.In step 920, eNB 104 is performed CCA, and transmission RTS message or CTS disappear on LTE-U SCell carrier waves before transmitting subframe on LTE-U SCell carrier waves Breath.RTS message or CTS message can include Duration field.Duration field can indicate that LTE-U SCell carrier waves will The occupied time period for data transfer.The other equipment operated in LTE-U SCell carrier waves can receive RTS or CTS And update network allocation vector (NAV).Then NAV fields implicitly indicate that LTE-U SCell carrier waves are continuing to other equipment May be busy during time period indicated by time field.
In step 930, send CTS or RTS message to remove the channel on LTE-U SCell carrier waves.In some implementations, Transmitter (such as eNB 104) can include destination-address (RA) and send RTS in RTS message.When RTS is received, Receiver (being identified by the RA in RTS message) can send CTS message, and CTS is sent back into transmitter.Because RTS and CTS disappear Breath the two have make the quiet same affect within the time period that Duration field is indicated of audiomonitor, so transmitter with connect Equipment near receipts machine can prevent to be transmitted during the time period.In some implementations, eNB is to RTS or CTS message Transmission carries out timing so that the subsequent scheduled transmissions on LTE-U SCell carrier waves are not disturbed.
In step 940, during the transmission time of the Duration field instruction of CTS or RTS message, eNB 104 is in LTE The scheduling grant of LTE-U SCell carrier waves is sent on the PDCCH of PCell carrier waves to LTE-UE 102.ENB 104 is also in LTE DL data are sent on SCell carrier waves to LTE-U UE 102.
Figure 10 shows the sample data flow graph for removing the timing relationship of channel with regard to downlink transmission of eNB 1000.In the example shown, eNB 104 on both LTE PCell carrier waves and LTE-U SCell carrier waves with LTE-U UE 102 Communication.ENB 104 sends RTS/CTS also on LTE-U SCell carrier waves to 802.11 equipment 106.In step 1010, eNB 104 determine the DL resources on license LTE-U SCell carrier waves.In step 1020, eNB 104 broadcasts RTS/CTS message adjusting The transmission time of degree removes LTE-U SCell carrier waves.As shown shown in example, LTE-U SCell carrier waves are made in eNB 104 After scheduling is determined, the window of opportunity for transmitting RTS or CTS message starts.In some implementations, eNB 104 can be in time RTS or CTS message is sent near actual PDSCH transmission.The method can make LTE-U SCell carrier waves keep busy, while Less value is set in Duration field.In some implementations, RTS or CTS message can be addressed to pseudo- MAC Address or seek Location is to the MAC Address being associated with eNB 104 itself.When RTS/CTS message is received, 802.11 equipment 106 can update NAV is reserved with pointing out LTE-U SCell carrier waves.Other equipment (for example, the Ren Heqi operated in LTE-U SCell carrier waves Its LTE-U eNB or Wi-Fi equipment) RTS or CTS message can also be read and NAV is updated.In order to perform in short duration Initial transmission and subsequent re-transmission, similar to TTI binding in the uplink direction, can continuously send out in continuous TTI Ground sends multiple redundancy versions of transmission block.Downlink TTI binding can be indicated by PDCCH.
In step 1030, eNB 104 can carry out sending out on LTE-U SCell carrier waves according to scheduling to LTE-U UE 102 Send.The following is the Examples section of the specifications of 3GPP TS 36.212 that can support above-mentioned channel sweep-out method.
Table 4.2-1 defines downlink transmission channel to the mapping of its corresponding physical channel.Table 4.2-2 is defined down Mapping of the row control channel information to its corresponding physical channel.
TrCH (transmission channel) Physical channel DL-SCH (downlink sharied signal channel) PDSCH BCH (broadcast channel) PBCH (Physical Broadcast Channel) PCH (paging channel) PDSCH MCH (Multicast Channel) PMCH (Physical Multicast Channel)
5 chnnel codings, multiplexing and intertexture
5.3.3.1.2 form 1
The PDSCH code word that DCI format 1 is used in one cell of scheduling.
Following information is sent by DCI format 1：
- 0 or 3 bits of-multi-carrier indicator.There is the field in the definition in [3].
- when multi-carrier indicator corresponds to the carrier wave in unlicensed spectrum, eNB should monitor the availability of carrier wave, and Transmit on carrier wave and CTS message is sent before PDSCH (referring to ieee standard 802.11TM- 2012, the 11st part), to guarantee the load Ripple can be used for the transmission of PDSCH code words.ENB realizations are left in the timing of transmission for, but should close PDSCH in time transmission Example but before PDSCH transmission transmit, and in CTS message indicate persistent period should cover PDSCH transmission when Section.
Figure 11 shows example data flow Figure 110 0 of the channel sweep-out method for UL transmission of eNB.Show shown In example, eNB 104 communicates on both LTE PCell carrier waves and LTE-U SCell carrier waves with LTE-U UE 102.eNB 104 RTS/CTS is sent also on LTE-U SCell carrier waves to 802.11 equipment 106.In step 1110, LTE-U UE 102 to ENB104 sends dispatch request (SR) to ask UL to transmit.In some implementations, SR can send on LTE PCell carrier waves. Alternatively or in combination, SR can send on LTE-U SCell carrier waves.In step 1120, eNB 104 determines license LTE-U UL resource collections on SCell carrier waves.In step 1130, eNB 104 sends the PUSCH transmission for LTE-U SCell carrier waves UL license.ENB 104 can send UL licenses on LTE PCell carrier waves.In the example shown, eNB 104 is in subframe #SN Place sends UL licenses, to permit that the UL at subframe #SN+4 is transmitted.In step 1140, eNB 104 to 802.11 equipment 106 are broadcasted CTS or RTS message.As it was previously stated, CTS or RTS message can include indicating to be used for the specific of the subframe that scheduled UL is transmitted The Duration field of quantity.In some implementations, TTI binding is not used, and the specific quantity of subframe can be 1.Alternatively Ground or in combination, using TTI binding, and the specific quantity of subframe can be 4.When RTS/CTS message is received, 802.11 Equipment 106 can update NAV to point out that LTE-U SCell carrier waves are reserved.Other operated in LTE-U SCell carrier waves set Standby (for example, any other LTE-U eNB or Wi-Fi equipment) can also read RTS or CTS and update NAV.ENB removes channel There can be one or more advantages for UL transmission.For example, the method has promoted the realization of the LBT schemes in eNB, and Reducing realize complexity at UE.In step 1150, eNB 104 connects on LTE-U SCell carrier waves from LTE-U UE 102 Receive PUSCH transmission.
Figure 12 shows example data flow Figure 120 0 for transmitting the timing relationship for removing channel with regard to UL of eNB. In the example shown, eNB 104 communicates on both LTE PCell carrier waves and LTE-U SCell carrier waves with LTE-U UE 102. ENB 104 sends RTS/CTS also on LTE-U SCell carrier waves to 802.11 equipment 106.In step 1210, LTE-U UE102 Send dispatch request (SR) to ask UL to transmit to eNB 104.In step 1220, eNB 104 determines license in LTE-U SCell UL resources on carrier wave.In step 1230, eNB 104 sends the UL of the PUSCH transmission being directed on LTE-U SCell carrier waves and is permitted Can.In the example shown, eNB 104 sends UL licenses at subframe #SN, to permit that the UL at subframe #SN+4 is transmitted.At some In realization, eNB 104 can use frequency domain dispatching (resource indicated for each UE such as on PDCCH) in identical UL subframe Dispatch the UL transmission for more than one LTE-U UE.
In step 1240, eNB 104 to 802.11 equipment 106 broadcasts CTS or RTS message.As it was previously stated, eNB can be RTS or CTS message is sent on LTE-U SCell carrier waves near actual PDSCH transmission on time.In some implementations, RTS or CTS message can be addressed to pseudo- MAC Address or be addressed to the MAC Address being associated with eNB 104 itself.In LTE-U SCell The other equipment (for example, any other LTE-U eNB or Wi-Fi equipment) operated in carrier wave can also read RTS or CTS and more New NAV.In step 1250, eNB 104 receives the PUSCH transmission on LTE-U SCell carrier waves from LTE-U UE 102.The following is The Examples section of the specifications of 3GPP TS 36.212 of above-mentioned channel sweep-out method can be supported.
5.3.3.1.1 form 0
The scheduling of the PUSCH that DCI format 0 is used in a UL cell.
Following information is sent by DCI format 0：
- multi-carrier indicator -0 or 3 bits.
- when multi-carrier indicator corresponds to the carrier wave in unlicensed spectrum, eNB will monitor the availability of carrier wave, and carry Occur sending CTS message before the PUSCH subframes dispatched on ripple, to guarantee that the carrier wave can be used to transmit PUSCH code words.CTS's The timing of transmission leaves eNB for realize, but in CTS frames indicate persistent period should be close in time scheduled in PUSCH frames, and the period of PUSCH transmission should be covered.
Figure 13 shows the flow chart 1300 of the channel sweep-out method of eNB.Flow chart 1300 starts from step 1310, its Middle eNB receives up-link (UL) transmission request from UE.In some instances, for example, when DL transmission is dispatched, it is convenient to omit step Rapid 1310.In step 1320, eNB sends clear to send (CTS) message on LTE-U SCell carrier waves or request sends (RTS) At least one of message.In CTS message or RTS message described at least one includes Duration field.Persistent period word Section indicates the transmission time of the transmission in the grouped data shared channel on LTE-U SCell carrier waves.In some implementations, from The time that CTS message or RTS message are received starts setting up the transmission time indicated by Duration field.For example, this In the case of, Duration field can be configured so that 8 subframes, and this indicates that transmission time is included in and receives CTS or RTS message Subframe after 8 subframes.Alternatively or in combination, can be from the time received relative to CTS message or RTS message Time predefined starts setting up Duration field.In some implementations, time predefined can be arranged by eNB.For example, Time predefined can be set to 4 subframes by eNB.In this case, if Duration field is arranged to 8 sons Frame, then transmission time the 5th subframe from after the subframe for receiving CTS or RTS message can be included to the 12nd subframe.ENB can Permitted with the scheduling sent for the transmission in the grouped data shared channel during transmission time on LTE-U SCell carrier waves Can.In some instances, in step 1330, eNB sends DL scheduling grants, and the scheduling grant indicates that physical down link is shared Channel (PDSCH) is transmitted.ENB sends PDSCH subframes also during transmission time.In some instances, in step 1332, eNB UL scheduling grants are sent, the UL scheduling grants indicate physical uplink link shared channels (PUSCH) transmission that UE is carried out.At this In the case of kind, in step 1334, eNB receives PUSCH subframes during transmission time from UE.
Figure 14 shows example data flow Figure 140 0 of the channel evaluation method for UL transmission of UE.In example shown In, eNB 104 communicates on both LTE PCell carrier waves and LTE-U SCell carrier waves with LTE-U UE 102.In step 1410, LTE-U UE 102 send dispatch request (SR) to ask UL to transmit to eNB104.In step 1420, eNB 104 determines UL resource of the license on LTE-U SCell carrier waves.In step 1430, eNB 104 is sent for LTE-U SCell carrier waves The UL licenses of PUSCH transmission.ENB 104 can send UL licenses on LTE PCell carrier waves.In the example shown, eNB 104 UL licenses are sent at subframe #SF, to permit that the UL at subframe #SF+4 is transmitted.In some implementations, LTE-U UE 102 can be with CCA is performed before LTE-U SCell on licensed subframe is accessed.CCA can be based on LBT schemes.In some implementations, LBT modules in LTE-U UE 102 can measure the signal level on LTE-U SCell carrier waves.If the signal level of measurement Higher than threshold value, then LTE module determines that LTE-U SCell carrier waves are busy.If the signal level of measurement is less than threshold value, LTE moulds Block determines that LTE-U SCell carrier waves are idle.In some implementations, if the signal level of measurement is equal to threshold value, LTE module can It is busy to determine LTE-U SCell carrier waves.Alternatively, if the signal level of measurement is equal to threshold value, LTE module can determine LTE-U SCell carrier waves are idle.
If LBT schemes indicate that LTE-U SCell carrier waves are busy, LTE-U UE 102 can be prevented in LTE-U Send on SCell carrier waves.In some implementations, eNB 104 can be by the ignored uplink frame for permitting to be considered as loss. In this case, eNB 104 can send new license, to provide the chance for retransmitting as the PUSCH subframes lost.Alternatively or In combination, eNB 104 can send HARQ NACK on LTE PCell carrier waves, and the HARQ NACK can be triggered can not had The non-self-adapting sent in the case of having scheduling grant is retransmitted.If LBT schemes indicate that LTE-U SCell carrier waves are idle, Step 1440, LTE-U UE 102 can be transmitted during subframe #SF+4 on the PUSCH of LTE-U SCell carrier waves. During some are realized, LTE-U UE 102 can be carried out on PUSCH using LTE TTI bindings during more than one subframe Send.
Figure 15 shows example data flow Figure 150 0 of the channel sweep-out method for UL transmission of UE.In example shown In, eNB 104 on both LTE PCell carrier waves and LTE-U SCell carrier waves with LTE-U UE1 1502 and LTE-U UE2 1508 communications.LTE-U UE1 1502 and LTE-U UE2 1508 are also on LTE-U SCell carrier waves to 802.11 equipment 106 Send RTS/CTS.In step 1510, LTE-U UE1 1502 send dispatch request (SR) to ask UL to transmit to eNB 104.In step Rapid 1520, eNB 104 determines the UL resource collections permitted to LTE-U UE1502 on LTE-U SCell carrier waves, and to LTE-U Different UL resource collections on the license LTE-U SCell carrier waves of UE2 1508.In step 1530, eNB 104 is to LTE-U UE1 1502 send UL licenses -1, and to LTE-U UE2 1504 UL licenses -2 are sent.ENB 104 can send out on LTE PCell carrier waves Give the two UL licenses.In the example shown, eNB 104 sends two UL licenses at subframe #SF, to permit subframe #SF+4 The UL resources at place.
Grasp in LTE-U SCell carrier waves in both step 1540, LTE-U UE1 1502 and LTE-U UE2 1508 The miscellaneous equipment (including 802.11 equipment 106) of work sends RTS message or CTS message.Because RTS or CTS message is used for from institute Other equipment (such as Wi-Fi equipment and/or other eNB) is removed in the subframe of scheduling, so broadcasting RTS by more than one UE Or CTS message can increase other equipment and can receive message and prevent the chance for sending.In some implementations, LTE-U UE1 1502 and/or LTE-U UE2 1508 can in time be close to actual UL transmission to send RTS or CTS message.In some realities In existing, the MAC Address that RTS or CTS message can be addressed to pseudo- MAC Address or be associated with the UE for sending RTC or CTS message. In step 1560, both LTE-U UE1 1502 and LTE-U UE2 1508 use the UL assigned in the UL of each of which licenses Resource sends UL at subframe #SF+4.
Figure 16 shows example data flow Figure 160 0 of the channel sweep-out method for UL transmission of both UE and eNB. In the example shown, eNB 104 on both LTE PCell carrier waves and LTE-U SCell carrier waves with LTE-U UEl 1502 and LTE-U UE2 1508 communicate.LTE-U UE1 1502, LTE-U UE2 1508 and eNB 104 are also in LTE-U SCell carrier waves On to 802.11 equipment 106 send RTS/CTS.In step 1610, LTE-U UE1 1502 to eNB 104 sends dispatch request (SR) asking UL to transmit.In step 1620, eNB104 is determined on the license LTE-U SCell carrier waves of LTE-U UE 1502 UL resource collections, and permit the different UL resource collections on LTE-U SCell carrier waves to LTE-U UE2 1508.In step 1630, eNB 104 to LTE-U UE1 1502 send UL licenses -1, and send UL licenses -2 to LTE-UE2 1504.eNB 104 can send the two UL licenses on LTE PCell carrier waves.In the example shown, eNB 104 sends at subframe #SF Two UL licenses, to permit the UL resources at subframe #SF+4.
In step 1640, eNB 104 is to the miscellaneous equipment operated in LTE-U SCell carrier waves (including 802.11 equipment 106) RTS or CTS message is sent.In both step 1642, LTE-U UE1 1502 and LTE-U UE2 1508 in LTE-U The miscellaneous equipment (including 802.11 equipment 106) operated in SCell carrier waves sends RTS or CTS message.Sent out by both eNB and UE CTS or RTS message is sent to enhance the covering of channel sweep-out method.For example, the method can help remove near eNB or UE Equipment channel.In step 1660, both LTE-U UEl 1502 and LTE-U UE2 1508 use the UL in each of which The UL resources assigned in license send UL data at subframe #SF+4.The following is can support above-mentioned channel sweep-out method The Examples section of the specifications of 3GPP TS 36.213.
8.0 are used to send the UE processes of physical uplink link shared channels
Unless otherwise defined, the term " UL/DL configurations " in this sub-clause refers to higher-layer parameter subframeAssignment。
For FDD and normal HARQ operation, when detecting the PDCCH/ with DCI format 0/4 on given Serving cell EPDCCH and/or in subframe n of UE PHICH transmit when, UE should be adjusted according to PDCCH/EPDCCH and PHICH information Corresponding PUSCH transmission in whole subframe n+4.If PDCCH/EPDCCH is related to the cross-carrier scheduling subframe on unauthorized carrier wave, Then UE will monitor transmission CTS message before the availability of carrier wave, and the PUSCH subframes for occurring dispatching on carrier wave, to guarantee this Carrier wave can be used for the transmission of PUSCH code words.UE realizations are left in the timing of the transmission of CTS for, but it should be close in time The persistent period indicated in PUSCH transmission, and CTS frames should cover the tune by indicated by PDCCH/EPDCCH DCI formats 0/4 The period of the PUSCH transmission of degree.
Figure 17 shows the example data flow of the channel evaluation method transmitted for the UL based on semi-static license of UE Figure 170 0.In the example shown, eNB 104 on both LTE PCell carrier waves and LTE-U SCell carrier waves with LTE-U UE 102 communications.In step 1710, eNB 104 sends semi-static UL licenses.Semi-static UL licenses can permit pre- at one or more The allowance being transmitted on the UL of LTE-U SCell carrier waves during stator frame.ENB 104 can with predetermined subframe as not The same pre-configured semi-static frequency domain resources (Resource Block) of UE, conflict is minimized.In step 1720, UE can determine first UL packets are sent at predetermined subframe.Before transmitting, LTE-U UE 102 can perform CCA based on LBT schemes, to determine LTE- Whether U SCell carrier waves are busy.In step 1730, if LTE-U SCell carrier waves are idle, LTE-U UE 102 are in LTE-U It is transmitted on the PUSCH of SCell carrier waves.In some implementations, LTE-U UE 102 can include in the subframe for being sent UE identifier (for example, its CRNTI).For example, PUSCH Frames can include CRNTI MAC CE.If LTE-U SCell are carried Ripple is busy, then LTE-U UE 102 can prevent to be sent at the first predetermined subframe.Alternatively or in combination, LTE-U UE 102 CTS or RTS message can be sent before the transmission in the first predetermined subframe to remove channel.
In step 1740, LTE-U UE 102 can determine and another UL packet is sent at the second predetermined subframe.Sending out Before sending, whether LTE-U UE 102 can perform CCA based on LBT schemes, busy to determine LTE-U SCell carrier waves.In step Rapid 1750, if LTE-U SCell carrier waves are idle, LTE-U UE 102 carry out sending out on the PUSCH of LTE-U SCell carrier waves Send.If LTE-U SCell carrier waves are busy, LTE-U UE 102 can prevent to be sent at the second predetermined subframe.Alternatively Or in combination, before sending in the second predetermined subframe, LTE-U UE 102 can send CTS or RTS message to remove channel. There can be one or more advantages using above-mentioned semi-static license scheduled transmission on LTE-U SCell carrier waves.For example, the party Method can reduce the expense of resource request and license.The method can also reduce the performance for postponing and improving latency sensitive service, The latency sensitive service can be indicated by the QCI of associated data service.
In some implementations, rrc message element (IE) can be used for the above-mentioned semi-static transmission of configuration.RRC IE can include In the RRCConnectionReconfiguration message of LTE-U UE 102 is sent to from eNB 104.The following is IE's LteuSCellUlConfig is defined, it can provide the example of the structure of IE and content.
Figure 18 shows the flow chart 1800 of the channel evaluation method that UE is carried out.Flow chart 1800 starts from step 1810, wherein UE receive UL licenses from eNB, UL license indicator to during one or more subframes in LTE-U The license of the PUSCH transmission on SCell carrier waves.In some implementations, can be on physical downlink control channel (PDCCH) Receive UL licenses.In some implementations, UL licenses are received on Long Term Evolution (LTE) main plot (PCell) carrier wave.In some realities In existing, UL licenses are the semi-static UL licenses for using RRC information configuration.In some implementations, in step 1820, UE is in LTE-U At least one of CTS message or RTS message are sent on SCell carrier waves, wherein, at least one of CTS message or RTS message Including Duration field, the Duration field indicates transmission time.
Signal level in step 1830, UE measurement LTE-U SCell carrier waves.In step 1840, UE is determined at one Or whether LTE-U Scell carrier waves can be used to transmit during multiple subframes.In some implementations, signal levels of the UE based on measurement Determine whether LTE-U SCell carrier waves can be used to transmit.If the signal level of measurement is higher than threshold value, in step 1850, UE Determine that LTE-U SCell carrier waves are not useable for transmission, and prevent to be transmitted on LTE-U SCell carrier waves.If measurement Signal level be less than threshold value, then in step 1852, UE determines that LTE-U SCell carrier waves can be used to transmit, and in LTE-U PUSCH subframes are sent on SCell carrier waves.In some implementations, if the signal level of measurement is equal to threshold value, LTE module can It is busy to determine LTE-U SCell carrier waves.Alternatively, if the signal level of measurement is equal to threshold value, LTE module can determine LTE-U SCell carrier waves are idle.In some implementations, when continuously more than one subframe is sent according to the configuration of eNB, UE makes Bound with LTE transmission time interval (TTI).
Figure 19 shows the schematic block diagram 1900 of exemplary user equipment.The equipment 1900 for illustrating includes processing unit 1902nd, computer-readable recording medium 1904 (such as ROM or flash memory), radio communication subsystem 1906, user interface 1908 and I/O interfaces 1910.
Processing unit 1902 can include that one or more process assemblies (are alternatively properly termed as " processor " or " central authorities Processing unit " is (CPU)), it is configured to perform and above in association with one or more implementation descriptions disclosed herein Instruction individual or that more are processed, step or action are related.In some implementations, processing module 1902 can be configurable to generate Control information (such as measurement report) or the information (for example, from the control information of network node) to receiving are responded. Processing module 1902 can be additionally configured to make RRM decisions (such as cell selection/reselection information) or triggering measurement report.Place Reason unit 1902 can also include other accessory parts, such as random access memory (RAM) and read only memory (ROM).Meter Calculation machine readable storage medium storing program for executing 1904 can be with the operating system (OS) of storage device 1900 and for performing above-mentioned process, step or dynamic The executable software program of various other computers of one or more in work.
Radio communication subsystem 1906 can be configured to supply the data and/or control provided for processing unit 1902 The radio communication of information.Radio communication subsystem 1906 can be included for example：One or more antennas, receiver, transmitter, sheet Ground agitator, frequency mixer and Digital Signal Processing (DSP) unit.In some implementations, subsystem 1906 can support multi input Multi output (MIMO) is transmitted.In some implementations, the receiver in radio communication subsystem 1906 can be senior receiver or Reference receiver.Two receivers can realize identical, similar or different receiver Processing Algorithm.
User interface 48 can include, such as one or more screens or touch screen (such as liquid crystal display (LCD), are sent out Optical display unit (LED), OLED (OLED), MEMS (MEMS) display), keyboard or keypad, track Ball, speaker and mike.I/O interfaces 1910 can include such as USB (universal serial bus) (USB) interface.Also may be used in equipment 1900 With including various other components.
Figure 20 shows the block diagram 2000 of example base station.Shown equipment 2000 includes processing module 2002, wire communication Subsystem 2004 and radio communication subsystem 2006.Radio communication subsystem 2006 can be from UE receiving datas business and control industry Business.In some implementations, radio communication subsystem 2006 can include Receiver And Transmitter.Wire communication subsystem 2004 can Control information is sent and received to be configured to be connected between other access node apparatus via backhaul.Processing module 2002 can So that including one or more process assemblies (being alternatively referred to as " processor " or " CPU (CPU) "), it can hold Row is related to above in association with one or more one or more process for realizing description disclosed herein, step or action Instruction.Processing module 2002 can also include other accessory parts, such as random access memory (RAM), read only memory (ROM), additional storage (for example, hard drive or flash memory).Processing module 2002 can be formed described by the relevant Fig. 2 of the above At least a portion of layer.In some implementations, processing module 2002 can be configurable to generate control information or to receiving Information (measurement report for for example, sending from UE) is responded.Processing module 2002 can be additionally configured at least part of ground RRM is made in the information (such as cell selection/reselection information or measurement report) sent from UE to determine.Processing module 2002 can be with Some instructions are performed using wire communication subsystem 2004 or radio communication subsystem 2006 and is ordered, to provide wireless or have Line communicates.Various other components can also be included in equipment 2000.
Have been described with multiple embodiments of the present invention.However, it should be understood that can be in the spirit and model without departing from the present invention Various modification can be adapted in the case of enclosing.Therefore, other embodiment falls within the scope of the appended claims.
Similarly, although in the accompanying drawings operation is depicted with particular order, but this is understood not to require these behaviour Make with the particular order that illustrates or perform in sequential order, or need to perform all operations for illustrating to realize desired knot Really.In specific environment, multitasking and parallel processing is probably favourable.Additionally, the multiple system groups in above-mentioned realization The separation of part is understood not to be required for this separation in all realizations, and it should be appreciated that described program Component and system are generally desirably integrated in single software product or are encapsulated in multiple software product.
Additionally, without departing from the scope of the present disclosure, described in various realizations and it is illustrated as discrete or separates Technology, system, subsystem and method can merge or integrated with other systems, module, techniques or methods.It is illustrated or discusses Sundry item to be coupled to each other or directly coupling or communicate can indirectly be coupled by certain interface, equipment or intermediate module Or communication, regardless of whether being electrically, mechanically or otherwise.Those skilled in the art can determine that and change Become, replace and change other examples, it is possible on the premise of without departing from spirit and scope disclosed herein, make change, Other examples replaced and change.
Although discussed in detail above have shown that, be described and pointed out being applied to the basic novel special of the disclosure of various realizations Levy, it is to be understood that those skilled in the art can be on the premise of the intention without departing from the disclosure, in the system Various omissions, substitutions and changes are made in form and details.Additionally, the order of method and step is not occurred in right by them wanting The hint of the order in asking.
Clear to send " CTS " message is sent on unauthorized LTE " LTE-U " secondary cell " SCell " carrier wave or request sends " RTS " At least one of message, wherein, described at least one in the CTS message or the RTS message includes persistent period word Section, the Duration field indicates the biography of the transmission in the grouped data shared channel on the LTE-U SCell carrier waves The defeated time；And
The scheduling for sending the transmission in the grouped data shared channel being directed on the LTE-U SCell carrier waves is permitted Can.
2. method according to claim 1, wherein, the scheduling grant indicates physical down link sharing channel " PDSCH " is transmitted, and methods described sends PDSCH subframes during being additionally included in the transmission time.
3. method according to claim 1, wherein, the scheduling grant indicates the physical uplink link sharing letter that UE is carried out Road " PUSCH " is transmitted, and methods described also includes：
Before in the CTS or described RTS message is sent described at least one, receive up-link " UL " from the UE and pass Defeated request；And
PUSCH subframes are received during the transmission time from the UE.
4. a kind of method, including：
Receive UL licenses from eNB, UL license indicator to during one or more subframes on LTE-U SCell carrier waves PUSCH transmission license；
It is determined that whether the LTE-U SCell carrier waves can be used in transmission during one or more of subframes；
If the LTE-U SCell carrier waves can be used in transmission, PUSCH is sent on the LTE-U SCell carrier waves Frame；And
If the LTE-U SCell carrier waves cannot be used for transmission, prevent to be passed on the LTE-U SCell carrier waves It is defeated.
5. method according to claim 4, wherein, the UL licenses are at physical downlink control channel " PDCCH " Upper reception.
6. method according to claim 4, wherein, the UL licenses are the semi-static UL licenses received in RRC information.
7. method according to claim 4, wherein, the UL licenses are carried in Long Term Evolution " LTE " main plot " PCell " Receive on ripple.
8. method according to claim 5, also includes：
At least one of CTS message or RTS message are sent on the LTE-U SCell carrier waves, wherein, the CTS message Or described at least one in the RTS message includes Duration field, the Duration field indicates transmission time；With And
PUSCH subframes are sent during the transmission time.
9. method according to claim 4, wherein it is determined that whether the LTE-U SCell carrier waves can be used in transmission bag Include：Measure the signal level on the LTE-U SCell carrier waves.
10. method according to claim 9, also includes：When the signal level less than threshold value is measured, it is determined that described LTE-U SCell carrier waves can be used in transmission.
11. methods according to claim 9, also include：When the signal level higher than threshold value is measured, it is determined that described LTE-U SCell carrier waves cannot be used for transmission.
12. methods according to claim 4, wherein, LTE transmission time interval is used when more than one subframe is sent " TTI " binds.
A kind of 13. methods, including：
The first discontinuous receive " DRX " is received from evolution NodeB " eNB " to configure；
When operating in DRX configurations, receive from the eNB and indicate that the DRX configurations for being switched to the 2nd DRX configurations are cut Instruction is changed, wherein, the DRX configurations switching instruction is the load in unauthorized LTE " LTE-U " secondary cell " SCell " carrier wave Receive after change；And
Indicate in response to DRX configuration switchings, from DRX configurations the 2nd DRX configurations are switched to.
14. methods according to claim 13, wherein, the DRX configurations switching instruction is at media access control " MAC " Receive in control unit " CE ".
15. methods according to claim 13, wherein, load in the LTE-U SCell carrier waves change be based on The lower change detection of at least one：Collision rate on the LTE-U SCell carrier waves, on the LTE-U SCell carrier waves The averaged energy levels that detect, the mean data rate reached on the LTE-U SCell carrier waves or medium take the factor.
16. methods according to claim 13, wherein, the DRX configurations switching instruction is at wireless heterogeneous networks " RRC " Receive in connection reconfiguration message.
17. methods according to claim 16, wherein, the RRC connections reconfiguration message includes matching somebody with somebody with the 2nd DRX Put associated parameter.
18. methods according to claim 13, wherein, the DRX configurations and the 2nd DRX configure preconfigured At user equipment " UE " place.
19. methods according to claim 18, wherein, the DRX configurations and the 2nd DRX configurations are to use RRC connections reconfiguration message is pre-configured to be at the UE.
DRX configurations are sent from eNB so that UE is operated in a DRX configuration modes；
Determine that the load in LTE-U SCell carrier waves changes；And
Based on the determination, send from the eNB and indicate that the DRX configuration switchings for being switched to the 2nd DRX configurations are indicated so that be described UE is operated in the 2nd DRX configuration modes.
A kind of 21. base stations, including：
One or more processors, are configured to：
Clear to send " CTS " message is sent on LTE-U SCell carrier waves or request sends at least one of " RTS " message, Wherein, described at least one in the CTS message or the RTS message includes Duration field, the persistent period word Section indicates the transmission time of the transmission in the grouped data shared channel on the LTE-U SCell carrier waves；And
22. base stations according to claim 21, wherein, the scheduling grant indicates physical down link sharing channel " PDSCH " transmit, and one or more of processors be additionally configured to during the transmission time send PDSCH it is sub Frame.
23. base stations according to claim 21, wherein, the scheduling grant indicates the physical uplink link sharing that UE is carried out Channel " PUSCH " is transmitted, and one or more of processors are additionally configured to：
A kind of 24. user equipmenies " UE ", including：
25. UE according to claim 24, wherein, the UL licenses are at physical downlink control channel " PDCCH " Upper reception.
26. UE according to claim 24, wherein, the UL licenses are the semi-static UL licenses received in RRC information.
27. UE according to claim 24, wherein, the UL licenses are carried in Long Term Evolution " LTE " main plot " PCell " Receive on ripple.
28. UE according to claim 25, wherein, one or more of processors are additionally configured to：
29. UE according to claim 24, wherein it is determined that whether the LTE-U SCell carrier waves can be used in transmission bag Include：Measure the signal level on the LTE-U SCell carrier waves.
30. UE according to claim 29, wherein, one or more of processors are additionally configured to：It is low when measuring When the signal level of threshold value, determine that the LTE-U SCell carrier waves can be used in transmission.
31. UE according to claim 29, wherein, one or more of processors are additionally configured to：When measuring height When the signal level of threshold value, determine that the LTE-U SCell carrier waves cannot be used for transmission.
32. UE according to claim 24, wherein, LTE transmission time interval is used when more than one subframe is sent " TTI " binds.
A kind of 33. user equipmenies " UE ", including：
One or more processors, are arranged to：
34. UE according to claim 33, wherein, the DRX configurations switching instruction is in media access control " MAC " control Receive in unit " CE " processed.
35. UE according to claim 33, wherein, it is based on following that the load in the LTE-U SCell carrier waves changes The change of at least one is detecting：Collision rate on the LTE-U SCell carrier waves, on the LTE-U SCell carrier waves The averaged energy levels that detect, the mean data rate reached on the LTE-U SCell carrier waves or medium take the factor.
36. UE according to claim 33, wherein, the DRX configurations switching instruction is connected in wireless heterogeneous networks " RRC " Connect what is received in reconfiguration message.
37. UE according to claim 36, wherein, the RRC connections reconfiguration message includes being configured with the 2nd DRX Associated parameter.
38. UE according to claim 33, wherein, the DRX configurations and the 2nd DRX configurations are pre-configured to be in At UE.
39. UE according to claim 38, wherein, the DRX configurations and the 2nd DRX configurations are to use RRC Connection reconfiguration message is pre-configured to be at the UE.
A kind of 40. base stations, including：
DRX configurations are sent from the base station so that UE is operated in a DRX configuration modes；
Based on the determination, send from the base station and indicate that the DRX configuration switchings for being switched to the 2nd DRX configurations are indicated so that institute State UE to operate in the 2nd DRX configuration modes.
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