WO2012135998A1 - Procédures d'accès aléatoire avec programmation inter porteuses - Google Patents

Procédures d'accès aléatoire avec programmation inter porteuses Download PDF

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Publication number
WO2012135998A1
WO2012135998A1 PCT/CN2011/072453 CN2011072453W WO2012135998A1 WO 2012135998 A1 WO2012135998 A1 WO 2012135998A1 CN 2011072453 W CN2011072453 W CN 2011072453W WO 2012135998 A1 WO2012135998 A1 WO 2012135998A1
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Prior art keywords
component carrier
random access
access channel
preamble
procedure
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PCT/CN2011/072453
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English (en)
Inventor
Haiming Wang
Jing HAN
Wei Bai
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Renesas Mobile Corporation
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Priority to PCT/CN2011/072453 priority Critical patent/WO2012135998A1/fr
Publication of WO2012135998A1 publication Critical patent/WO2012135998A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]

Definitions

  • the exemplary and non-limiting embodiments of this invention relate generally to wireless communication systems, methods, devices and computer programs and, more specifically, relate to cross scheduling a user equipment to a component carrier which is not yet active for that user equipment.
  • LTE E-UTRAN evolved UTRAN
  • each UE is to be assigned one PCC (alternatively termed a Pcell) which remains active and one or more SCCs (alternatively termed Scells) which may or may not be active at any given time, depending on data volume for the UE and traffic conditions in the serving cell.
  • PCC alternatively termed a Pcell
  • SCCs alternatively termed Scells
  • At least one CC is to be backward compatible with UE's which are not capable of CA operation, and the SCCs may be similar to the PCC (e.g., with their own set of control channels) or what is termed extension CCs which can be utilized only in conjunction with a full CC (e.g., only traffic channels on the extension CCs).
  • the network can send a resource allocation (a PDCCH) to a UE on its PCC which allocates resources for sending/receiving data on an extension carrier. This is known as cross-scheduling (the resource allocation or schedule is communicated on a different CC than the scheduled radio resource is located), and is not limited to only the PCC and extension CCs.
  • the LTE-A system seeks to expand this concept so that it is possible to have one or more SCCs in unlicensed spectrum such as the ISM band or TV WSs (e.g., published by the Federal Communications Commission in the US and under consideration for use in CA systems).
  • SCCs in unlicensed spectrum
  • TV WSs e.g., published by the Federal Communications Commission in the US and under consideration for use in CA systems.
  • the most straightforward way to get the TA for an SCC to a given UE appears to have the UE establish a connection via a RACH procedure on that SCC. But in this case the UE already has an established RRC connection with the network (at least on its PCC).
  • One option is for the UE to run a conventional contention-based RACH procedure in which the UE randomly selects a RACH preamble and sends the selected preamble on a PRACH.
  • the UE's preamble has the potential to interfere with another UE's preamble sent at the same time-frequency resource.
  • a higher probability of success can be achieved if instead the UE ran a contention-free RACH procedure.
  • the network would send to the UE a PDCCH which has the preamble for the UE to use for its RACH procedure.
  • Figure IB gives an overview of a contention-free RACH procedure in the LTE system, using the conventional designators 0, 1 and 2 for the illustrated messages.
  • the network/eNB assigns the random access preamble to the UE in message 0 which is sent via dedicated DL signaling (e.g., directed specifically to the UE).
  • message 0 is the PDCCH.
  • the UE sends message 1 UL on the RACH, and message 1 includes the preamble which was assigned by message 0 and is sent on a PRACH identified by a PRACH mask index.
  • Message 2 is the network's random access response to message 1, which is sent on the DL-SCH. There is a predetermined mapping from message 1 to the DL-SCH so the UE knows where to look for message 2.
  • Message 2 indicates to the UE the absolute UL timing advance and also includes a UL grant as well.
  • an apparatus comprising a processing system including at least one processor and a memory storing a set of computer instructions.
  • the processing system is arranged to: determine from a downlink message received on an activated first component carrier that a random access channel procedure for an un-activated second component carrier is triggered; and automatically in response to the determination, activate the second component carrier and execute the procedure utilizing the random access channel of the second component carrier for obtaining at least a timing indication for the second component carrier.
  • a method comprising: determining from a downlink message received on an activated first component carrier that a random access channel procedure for an un-activated second component carrier is triggered; and automatically in response to the determining, activating the second component carrier and executing the procedure utilizing the random access channel of the second component carrier to obtain at least a timing indication for the second component carrier.
  • a computer readable memory storing a set of instructions, which when executed by an apparatus, causes the apparatus to: determine from a downlink message received on an activated first component carrier that a random access channel procedure for an un-activated second component carrier is triggered; and automatically in response to the determination, activate the second component carrier and execute the procedure utilizing the random access channel of the second component carrier to obtain at least a timing indication for the second component carrier.
  • a fourth exemplary embodiment of the invention there is an apparatus comprising a processing system comprising at least one processor and a memory storing a set of computer instructions.
  • the processing system is arranged to: send a downlink message on an activated first component carrier to trigger a random access channel procedure for an un-activated second component carrier; and during the triggered random access channel procedure, receive a preamble on the random access channel of the second component carrier and send a response to the preamble on other than the second component carrier.
  • a fifth exemplary embodiment of the invention there is a method comprising: sending a downlink message on an activated first component carrier to trigger a random access channel procedure for an un-activated second component carrier; and during the triggered random access channel procedure, receiving a preamble on the random access channel of the second component carrier and sending a response to the preamble on other than the second component carrier.
  • a computer readable memory storing a set of instructions, which, when executed by an apparatus, causes the apparatus to: send a downlink message on an activated first component carrier to trigger a random access channel procedure for an un-activated second component carrier; and during the triggered random access channel procedure, receive a preamble on the random access channel of the second component carrier and send a response to the preamble on other than the second component carrier.
  • Figure 1A is a schematic frequency diagram showing a carrier aggregation system in which some component carriers lay in a licensed band and some lay in unlicensed bands.
  • Figure 1 B is a signaling diagram illustrating a contention-free RACH procedure according to conventional LTE systems.
  • Figure 2 is an exemplary MAC control element which the network sends in message 0 of Figure IB to trigger RACH on a SCC according to a second exemplary embodiment of the invention.
  • Figure 3 is an exemplary MAC control element which the network sends in message 2 of Figure IB to provide a timing advance for a SCC according to an exemplary embodiment of the invention.
  • Figures 4-7 are exemplar flow diagrams illustrating various embodiments of the invention from the perspective of the UE ( Figures 4-6) and of the eNB ( Figure 7).
  • Figures 8-9 are logic flow diagrams from the perspective of the UE and the eNB, respectively, that each illustrates the operation of a method, and a result of execution by an apparatus of a set of computer program instructions embodied on a computer readable memory, in accordance with the exemplary embodiments of this invention.
  • Figure 10 is a simplified block diagram of a UE and an eNB which are exemplary electronic devices suitable for use in practicing the exemplary embodiments of the invention.
  • the eNB will have to go through two procedures; one activating the SCC with activation command MAC CE, and another to initiate the RACH on it afterwards.
  • the eNB may order UE-1 to do a RACH procedure on UL SCC#1 with preamble x and RA-RNTI n while it also orders UE-2 to do a RACH procedure on UL SCC#2 with preamble x and RA-RNTI n.
  • cross-carrier scheduling there would be no UE ambiguity but with cross-carrier scheduling the e-NB would transmit the RACH response/message 2 for both RACHs on DL SCC#1 and addressed to RA-RNTI n, so neither UE could know to whom it was intended.
  • the e-NB would avoid this problem by carefully managing its RACH scheduling is to impose an inflexibility to the eNB's scheduling that is likely to manifest itself as wasted radio resources.
  • the only reason an eNB would need to trigger a RACH on an SCC is if the eNB wanted to use the SCC immediately.
  • the eNB In current practice, when an e-NB wants to use some deactivated SCC for which the target UE does not have proper TA, the eNB must first activate the SCC for the UE with an activation command and then trigger the RACH on it, but as noted above this is inefficient and causes more delay than the inventors consider is necessary. So according to an exemplary embodiment of the invention, if an e-NB triggers the RACH for a deactivated SCC, the UE should implicitly activate that SCC. The UE should activate it even in the absence of the conventional activation command from the eNB.
  • the network triggers the RACH on the SCC using a PDCCH in DCI format 1A, which the eNB sends to the UE on the PCC (or other activated SCC).
  • This PDCCH is modified as compared to conventional practice in order to trigger the RACH, by example using the following fields with the annotated bit lengths and values: - Flag for format 0/1 A, one bit set to " 1 "
  • the network triggers the RACH on the SCC using a new MAC CE which is shown by non-limiting example at Figure 2.
  • Field 202 gives the index of the SCC
  • field 203 gives the identifier for the RACH preamble
  • field 204 gives the index of the PRACH mask.
  • the UE will send the preamble identified at field 203 on the PRACH identified by field 204 in the SCC identified by field 202, and the UE automatically activates that SCC of field 202 in response to reading this CE.
  • Field 203 spans both bytes of the illustrated CE.
  • "R" in the fields indicates that bit position is reserved for future use.
  • the index of the SCC e.g., a first index
  • the RACH preamble index e.g., a second index
  • the PRACH mask index e.g., a third index
  • the network triggers the RACH on the SCC by including an explicit RACH trigger in its RRC signaling that adds the de-activated SCC to the UE's active set.
  • RACH message 0 and the RACH response message 2 are sent by the network on the PCC and are addressed to a common RNTI.
  • the UE would send its preamble in RACH message 1, which was triggered by message 0, on the RACH in the SCC.
  • the RACH procedure detailed immediately above is modified in that the network's RACH response message is modified from the conventional message 2.
  • RACH message 2 will schedule some UL resource on which the UE then sends its RRC Connection Request.
  • LTE Release 8 the UE is not in a RRC Connected state with the network until the network's subsequent RRC Connection Response message grants that request.
  • the UE is already in a RRC Connected state with the network on the PCC, on which the UE received the PDCCH triggering the RACH procedure on the SCC.
  • the network's RACH response message 2 is modified to indicate to the UE the absolute UL timing advance on the SCC. Since the purpose of the RACH procedure in this case is to get the TA to the UE and not to establish an RRC connected state between the UE and the network, there is no need for the RACH response message 2 to also include an UL resource for the UE's RRC Connection Request message. Other portions of the conventional RACH response message 2 may also be dropped from the modified message 2. In this embodiment the UE receives this modified RACH response message 2 via dedicated signaling on the PCC, and the UE will interpret this modified RACH response message 2 as the RACH procedure was successful.
  • An embodiment of this modified RACH response message 2 includes a new MAC CE to depict the TA value as shown at Figure 3.
  • Field 302 gives the cell index of the SCC and field 304 gives the TA for the newly activated SCC.
  • the bits giving the TA in field 304 span across the two bytes of that CE. Since the eNB wants to utilize the SCC for that UE immediately as noted above, this option is seen to minimize the delay in getting the TA to the UE.
  • Figures 4-7 are exemplary but non-limiting flow diagrams illustrating various of the above embodiments.
  • Figure 4 illustrates one embodiment for the flow of the RACH trigger procedure for a newly configured SCC from the perspective of the UE. If the UE is configured with a SCC which needs separate TA as shown at block 402, the UE should check at block 404 if a contention free RACH trigger is also included in the configuration RRC signaling. If no then the SCC remains deactivated at block 406 and continue as is conventional for LTE Release 10. If yes then at block 408 the UE should activate the SCC upon the reception of the block 404 RRC signaling and at block 408 perform a RACH procedure on that SCC. After the RACH is determined to be successful, the UE should be able to transmit and/or receive data on the newly configured SCC.
  • FIG. 5 illustrates flow of the contention-free RACH trigger for a newly configured SCC from the perspective of the UE.
  • the SCC is already configured it is but out of uplink synchronization, and so the UE checks at block 504 if there is contention free RACH trigger transmitted on the PCC (or other activated SCC). If the SCC is deactivated at block 506 and the RACH is triggered on it, the UE should at block 510 first activate the SCC and then at block 508 perform a RACH procedure on it. If instead the SCC is already activated for the RACH trigger received at block 504, then the UE follows the order of the eNB and at block 508 performs the RACH procedure on that SCC.
  • FIG. 6 illustrates flow of the contention-free RACH procedure on a SCC from the perspective of the UE.
  • the UE When the UE receives at block 602 a contention free RACH trigger on the SCC, the UE should transmit at block 604 the preamble according to the received RACH order. Regardless of whether or not cross-carrier scheduling is configured for this SCC, the UE at block 606 then should monitor for the RACH response message 2 on the DL CC linked by the SIB-2, or alternatively the UE will receive the TA value via dedicated signaling in the response message 2 itself which the UE will interpret at a successful RACH procedure.
  • Figure 7 illustrates flow of the RACH trigger and response from the perspective of the eNB.
  • the eNB decides to use a SCC for a UE as soon as possible, and at block 704 the eNB first checks whether or not there is already a configured SCC for this UE. If there is no SCC already configured (or if the eNB wants to configure an additional SCC for this UE) and the target SCC will need a separate TA value, then the e-NB at block 706 includes the contention free RACH trigger into the RRC message which adds the intended SCC to the UE's active set of CCs.
  • the e-NB at block 708 triggers a RACH procedure on that SCC by sending a PDCCH in DCI format 1 A on the PCC (or other activated SCC), or the eNB can trigger a contention free RACH by sending a MAC CE as noted above for Figure 2.
  • the e-NB should monitor at block 710 if there is corresponding preamble received. Once that preamble is received then at block 712 the e-NB should transmit the RACH response message 2 on the DL CC that is linked by the SIB-2, or the eNB may send the absolute TA command via dedicated signaling as in Figure 3.
  • the e-NB After sending the RACH response message 2 or the TA command, at block 714 the e-NB should then see that the SCC is activated.
  • Various of the above embodiments provide the following technical effects. Respecting the UE automatically activating a SCC for which it receives any of the above RACH triggers, the UL synchronization procedure for a deactivated SCC is simplified while reducing both signaling overhead (as compared to conventional SCC activation and RACH procedures which are separate) and also the delay in getting the UE synchronized to the SCC. Another technical effect is that the RACH can be triggered from the PCC or from any other activated SCC.
  • the technical effects include avoiding UE ambiguity in the RACH response message 2 procedure, reducing unnecessary overhead in the RACH response message 2 (as shown at Figure 3), and being particularly useful for an SCC in the unlicensed band.
  • Figures 8-9 are logic flow diagrams which summarize the above various exemplary embodiments of the invention.
  • Figure 8 describes from the perspective of a user equipment and
  • Figure 9 describes from the perspective of the network eNB.
  • Figures 8-9 as well as those at Figures 4-7 may each be considered to illustrate the operation of a method, and a result of execution of a computer program stored in a computer readable memory, and a specific manner in which components of an electronic device are configured to cause that electronic device to operate, whether such an electronic device is the UE or eNB, or one or more components thereof such as a modem, chipset, or the like.
  • the various blocks shown in any of Figures 4-9 may also be considered as a plurality of coupled logic circuit elements constructed to carry out the associated function(s), or specific result of strings of computer program code or instructions stored in a memory.
  • Such blocks and the functions they represent are non-limiting examples, and may be practiced in various components such as integrated circuit chips and modules, and that the exemplary embodiments of this invention may be realized in an apparatus that is embodied as an integrated circuit.
  • the integrated circuit, or circuits may comprise circuitry (as well as possibly firmware) for embodying at least one or more of a data processor or data processors, a digital signal processor or processors, baseband circuitry and radio frequency circuitry that are configurable so as to operate in accordance with the exemplary embodiments of this invention.
  • first CC and second CC are used to distinguish them from one another; the first CC may be a PCC or an activated SCC for example and the second CC may be the other CC for which the UE does not have the UL TA.
  • the UE determines from a DL message received on an activated first CC that a random access channel procedure for an un-activated second CC is triggered.
  • the first CC can be the PCC or any other SCC that is already activated for the UE; the second CC is of course the SCC for which the UE does not have the proper TA.
  • Block 804 stipulates that automatically in response to the determination of block 802 the UE activates the second CC and executes the procedure utilizing the RACH of the second CC for obtaining at least a timing indication for the second CC.
  • Block 806 tells that the DL message comprises a first index identifying the second CC a second index identifying a preamble, and a third index identifying a PRACH resource on which the UE is to send the preamble. Together these three indices trigger the RACH procedure. This is consistent with the first and second embodiments above.
  • Block 808 describes the first embodiment; the DL message comprises a PDCCH having a DCI format 1 A, modified as in the example above to include the three indices of block 806.
  • Block 810 describes the second embodiment; the DL message of block 802 comprises a medium access control MAC control element CE such as that shown at Figure 2, and that MAC CE includes the three indices of block 806.
  • Block 812 describes the third embodiment; the DL message of block 802 comprises RRC signaling which adds the second CC to the UE's active component carrier set and also includes an indication to trigger the RAH procedure.
  • Block 814 describes the case in which the network uses a PDCCH addressed to a common RNTI.
  • This PDCCH also identifies to the UE a DL resource on which the network will send its RACH response message 2, and that identified DL resource is on some CC other than the second CC. It may be the PCC or some other configured and active SCC.
  • Block 816 specifies that the RACH procedure is contention-based, and the response which the UE receives on the DL resource identified at block 814 has an absolute TA for the second CC, and block 818 gives the specific embodiment of the SCC being in the unlicensed frequency band for which the block 816 embodiment is particularly useful.
  • Figure 8 may be performed by a UE as noted, or by one or more components thereof such as for example a modem or a system on a chip for use within a UE.
  • Figure 9 is a logic flow diagram that illustrates from the perspective of a network access node such as an eNB or frequency selective repeater or remote radio head.
  • the eNB sends a DL message on an activated first CC to trigger a RACH procedure for an un-activated second CC.
  • the first CC can be the PCC or any other SCC that is already activated for the UE for which the network in Figure 9 is triggering the RACH procedure; and the second CC is the SCC for which that same UE does not have the proper TA.
  • the eNB receives a preamble on the RACH of the second CC and sends a response to the preamble on some CC other than the second CC, which by example may be the first CC or some third CC which is configured and activated already for the UE.
  • Block 906 tells that the DL message comprises a first index identifying the second CC, a second index identifying the preamble of block 904, and a third index identifying a physical random access channel PRACH resource on which the UE is to send the preamble. Together these three indices trigger the RACH procedure.
  • Block 908 details the first embodiment above; the DL message comprises a PDCCH having a DCI format 1A which is modified such as the example above to include the three indices of block 906.
  • the second embodiment detailed above is shown at block 910, the DL message comprises a medium access control MAC control element CE such as that shown at Figure 2 which also includes the three indices of block 906.
  • the DL message comprises RRC signaling which adds the second CC to the UE's active component carrier set and which includes an indication to trigger the RACH procedure.
  • Block 914 describes the case in which the network addresses a PDCCH to a common RNTI.
  • the network also uses this PDCCH to identify to the UE a DL resource on which the network will send its RACH response message 2, which is the response noted at block 904.
  • This identified DL resource is on some CC other than the second CC as block 904 also tells, and by example it may be on the PCC or on some other configured and active SCC.
  • Block 916 specifies that the RACH procedure is contention-based, and the response which network sends to the UE on the DL resource identified at block 914 has the timing indication which is an absolute TA for the second CC.
  • Block 918 gives the specific embodiment of the SCC being in the unlicensed frequency band for which the block 916 embodiment is particularly useful
  • Figure 9 procedure may be done by an eNB, frequency selective repeater, remote radio head, or one or more components thereof such as a modem and/or a system on a chip for use within a network access node.
  • an eNB 22 is adapted for communication over a wireless link 21 with an apparatus, such as a mobile terminal or UE 20.
  • the eNB 22 may be any access node (including frequency selective repeaters) of any wireless network using licensed (and in some embodiments also unlicensed) bands, such as LTE, LTE-A, GSM, GERAN, WCDMA, and the like.
  • the operator network of which the eNB 22 is a part may also include a network control element such as a mobility management entity MME and/or serving gateway SGW 24 or radio network controller RNC which provides connectivity with further networks (e.g., a publicly switched telephone network PSTN and/or a data communications network/Internet) .
  • a network control element such as a mobility management entity MME and/or serving gateway SGW 24 or radio network controller RNC which provides connectivity with further networks (e.g., a publicly switched telephone network PSTN and/or a data communications network/Internet) .
  • the UE 20 includes processing means such as at least one data processor (DP) 20A, storing means such as at least one computer-readable memory (MEM) 20B storing at least one computer program (PROG) 20C, communicating means such as a transmitter TX 20D and a receiver RX 20E for bidirectional wireless communications with the eNB 22 via one or more antennas 20F. Also stored in the MEM 20B at reference number 20G are the rules for cross-scheduling and triggering the RACH procedure, as well as which CCs to map the various messages for the RACH procedure as variously described in the embodiments above.
  • the eNB 22 also includes processing means such as at least one data processor (DP) 22A, storing means such as at least one computer-readable memory (MEM) 22B storing at least one computer program (PROG) 22C, and communicating means such as a transmitter TX 22D and a receiver RX 22E for bidirectional wireless communications with the UE 20 via one or more antennas 22F.
  • the eNB 22 stores at block 22G similar rules for cross-scheduling and triggering the RACH procedure and for mapping the various messages for the RACH procedure onto various CCs as variously described in the embodiments above.
  • those devices are also assumed to include as part of their wireless communicating means a modem and/or a chipset which may or may not be inbuilt onto an RF front end chip within those devices 20, 22 and which also operates utilizing the cross-scheduling and RACH triggering and CC mapping rules.
  • At least one of the PROGs 20C in the UE 20 is assumed to include a set of program instructions that, when executed by the associated DP 20A, enable the device to operate in accordance with the exemplary embodiments of this invention, as detailed above.
  • the eNB 22 also has software stored in its MEM 22B to implement certain aspects of these teachings.
  • the exemplary embodiments of this invention may be implemented at least in part by computer software stored on the MEM 20B, 22B which is executable by the DP 20A of the UE 20 and/or by the DP 22A of the eNB 22, or by hardware, or by a combination of tangibly stored software and hardware (and tangibly stored firmware).
  • Electronic devices implementing these aspects of the invention need not be the entire devices as depicted at Figure 10 or may be one or more components of same such as the above described tangibly stored software, hardware, firmware and DP, or a system on a chip SOC or an application specific integrated circuit ASIC.
  • the various embodiments of the UE 20 can include, but are not limited to personal portable digital devices having wireless communication capabilities, including but not limited to cellular telephones, navigation devices, laptop/palmtop/tablet computers, digital cameras and music devices, and Internet appliances.
  • Various embodiments of the computer readable MEMs 20B, 22B include any data storage technology type which is suitable to the local technical environment, including but not limited to semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory, removable memory, disc memory, flash memory, DRAM, SRAM, EEPROM and the like.
  • Various embodiments of the DPs 20A, 22A include but are not limited to general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and multi-core processors.

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Abstract

Dans ses divers modes de réalisation, la présente invention se rapporte à des procédés adaptés pour déclencher une procédure RACH via une programmation croisée de telle sorte qu'un UE puisse obtenir une indication de synchronisation pour une composante porteuse (CC) secondaire. Selon la présente invention, un réseau peut envoyer, sur une CC primaire, un signal de PDCCH ou un signal MAC contenant des indices pour un préambule, un PRACH et le SCC ; l'UE envoie le préambule sur le PRACH de la CC secondaire et obtient la valeur TA à partir de la procédure RACH. Autrement, le réseau peut envoyer un signal RRC qui ajoute le SCC à l'ensemble d'UE configuré et qui contient également une indication de déclencher la procédure RACH sur le SCC. Au cours d'une procédure RACH basée sur la résolution de conflits, le réseau peut envoyer un signal de PDCCH identifiant une ressource DL sur la CC primaire, et répondre au préambule de l'UE sur cette ressource sur la liaison descendante avec une valeur TA absolue pour la CC secondaire.
PCT/CN2011/072453 2011-04-04 2011-04-04 Procédures d'accès aléatoire avec programmation inter porteuses WO2012135998A1 (fr)

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WO2015146638A1 (fr) * 2014-03-28 2015-10-01 株式会社Ｎｔｔドコモ Terminal de radiocommunication, station de base radio et procédé de radiocommunication
CN105264968A (zh) * 2014-04-29 2016-01-20 华为技术有限公司 一种随机接入的装置及方法
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CN105450376A (zh) * 2014-08-28 2016-03-30 成都鼎桥通信技术有限公司 非对称上行载波聚合中辅载波的控制方法及装置
WO2016068644A1 (fr) * 2014-10-30 2016-05-06 Lg Electronics Inc. Procédé et appareil pour effectuer une initiation d'accès et une réponse pour une cellule sur porteuse sans licence dans un système de communication sans fil
WO2016085287A1 (fr) * 2014-11-27 2016-06-02 엘지전자 주식회사 Procédé d'accès aléatoire et appareil pour celui-ci
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JPWO2016133181A1 (ja) * 2015-02-19 2018-01-11 株式会社Ｎｔｔドコモ ユーザ端末、無線基地局及び無線通信方法
CN106341899A (zh) * 2015-07-14 2017-01-18 中兴通讯股份有限公司 基于非授权载波执行随机接入的方法及装置
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CN106714295A (zh) * 2015-07-15 2017-05-24 中兴通讯股份有限公司 一种数据传输方法和装置
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WO2017024468A1 (fr) * 2015-08-10 2017-02-16 华为技术有限公司 Procédé et appareil d'accès aléatoire
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