WO2016138656A1 - Procédure d'accès dans des communications sans fil - Google Patents

Procédure d'accès dans des communications sans fil Download PDF

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Publication number
WO2016138656A1
WO2016138656A1 PCT/CN2015/073681 CN2015073681W WO2016138656A1 WO 2016138656 A1 WO2016138656 A1 WO 2016138656A1 CN 2015073681 W CN2015073681 W CN 2015073681W WO 2016138656 A1 WO2016138656 A1 WO 2016138656A1
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WO
WIPO (PCT)
Prior art keywords
cell
access procedure
initiated access
network
primary cell
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PCT/CN2015/073681
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English (en)
Inventor
Peng Wu
Bao Vinh Nguyen
Haiqin LIU
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Qualcomm Incorporated
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Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2015/073681 priority Critical patent/WO2016138656A1/fr
Publication of WO2016138656A1 publication Critical patent/WO2016138656A1/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
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point

Definitions

  • the present disclosure for example, relates to wireless communication systems, and more particularly to access procedures in wireless communication systems.
  • Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be multiple-access systems capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) . Examples of such multiple-access systems include code-division multiple access (CDMA) systems, time-division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, and orthogonal frequency-division multiple access (OFDMA) systems.
  • CDMA code-division multiple access
  • TDMA time-division multiple access
  • FDMA frequency-division multiple access
  • OFDMA orthogonal frequency-division multiple access
  • a wireless multiple-access communication system may include a number of base stations, each simultaneously supporting communication for multiple communication devices, otherwise known as user equipments (UEs) .
  • a base station may communicate with UEs on downlink channels (e.g., for transmissions from a base station to a UE) and uplink channels (e.g., for transmissions from a UE to a base station) .
  • a UE may communicate with more than one base stations utilizing carrier-aggregation (CA) techniques by aggregating carrier (s) from a primary base station (or cell) with additional carrier (s) from one or more secondary base stations (or cells) .
  • CA carrier-aggregation
  • the added carriers provide for wider bandwidth, and by extension a greater throughput, communications.
  • a UE may access a base station using a random access procedure, which includes exchanging several messages to establish a resource assignment.
  • the random access procedure may be UE initiated when the UE has data to communicate or network initiated when there is data addressed to the UE.
  • a UE initiated access procedure will typically be used to access resources of the primary base station (or cell) for the UE to send its data whereas the network will typically initiate the access procedure for secondary base station (or cell) communications.
  • UE initiated access procedures with the primary base station (or cell) will generally be a contention based access procedure to avoid collisions with other UEs attempting to access the base station.
  • Network initiated access procedures to the contrary, will typically be non-contention based.
  • a UE may benefit from utilizing a network initiated access procedure, e.g., to save time, rather than a UE-initiated access procedure.
  • the UE may give preference to a network initiated access procedure over a UE initiated access procedure.
  • a UE may be CA configured and have an ongoing access procedure with a secondary cell.
  • the UE may determine that a UE initiated access procedure with its primary cell has been triggered, e.g., the UE may determine there is data in its data buffer that is to be communicated.
  • the UE may cancel or pause the UE initiated access procedure with the primary cell based on the network initiated access procedure.
  • the UE may complete the access procedure with the secondary cell and use the assigned resources to send its data.
  • the primary cell and the secondary cell may belong to the same timing advance group (TAG) where each cell is time synchronized.
  • TAG timing advance group
  • the UE may leverage its timing synchronization obtained during the access procedure with the secondary cell to synchronize with its primary cell. Accordingly, the UE may select the faster network initiated access procedure with the secondary cell to obtain timing synchronization, network resources, and the like, that can be used for UE communications with the secondary cell, the primary cell, or both.
  • a method for wireless communication may include: determining that a user equipment (UE) initiated access procedure with a first cell has been triggered; determining that a network initiated access procedure is in progress with a second cell; and canceling the UE initiated access procedure with the first cell based at least in part on the network initiated access procedure with the second cell.
  • UE user equipment
  • the first cell is a primary cell and the second cell is a secondary cell, the first cell and the second cell belonging to a same timing advance group.
  • the method may include completing the network initiated access procedure with the secondary cell.
  • the method may include synchronizing with the primary cell and the secondary cell based at least in part on the network initiated access procedure with the secondary cell.
  • the method may include: determining that a timing synchronization for an uplink resource provided by the primary cell is out of synchronization; determining that the network access procedure with the secondary cell is successful; and synchronizing the timing synchronization for the uplink resources provided by the primary cell based at least in part on the network initiated access procedure with the secondary cell.
  • the uplink resource is at least one of a physical uplink control channel, or a physical uplink shared channel, or a combination thereof.
  • the method may include: determining that a timing synchronization for an uplink resource provided by the primary cell is in synchronization; determining that the network access procedure with the secondary cell is unsuccessful; and releasing the uplink resource provided by the primary cell.
  • the method may include retriggering the UE initiated access procedure with the primary cell.
  • the method may include: determining that a preamble message of the UE initiated access procedure with the primary cell is unsuccessful; and performing the network initiated access procedure with the secondary cell.
  • the method may include: holding a scheduling request message for the primary cell to start the UE initiated access procedure; releasing the scheduling request message for the primary cell if the network initiated access procedure is unsuccessful; and canceling the scheduling request message for the primary cell if the network initiated access procedure is successful.
  • an apparatus for wireless communication may include: a processor; memory in electronic communication with the processor; and instructions stored in the memory.
  • the instructions being executable by the processor to: determine that a user equipment (UE) initiated access procedure with a first cell has been triggered; determine that a network initiated access procedure is in progress with a second cell; and cancel the UE initiated access procedure with the first cell based at least in part on the network initiated access procedure with the second cell.
  • UE user equipment
  • the first cell is a primary cell and the second cell is a secondary cell, the first cell and the second cell belonging to a same timing advance group.
  • the apparatus may include instructions executable by the processor to complete the network initiated access procedure with the secondary cell.
  • the apparatus may include instructions executable by the processor to synchronize with the primary cell and the secondary cell based at least in part on the network initiated access procedure with the secondary cell.
  • the apparatus may include instructions executable by the processor to: determine that a timing synchronization for an uplink resource provided by the primary cell is out of synchronization; determine that the network access procedure with the secondary cell is successful; and synchronize the timing synchronization for the uplink resources provided by the primary cell based at least in part on the network initiated access procedure with the secondary cell.
  • the uplink resource may be at least one of a physical uplink control channel, or a physical uplink shared channel, or a combination thereof.
  • the apparatus may include instructions executable by the processor to: determine that a timing synchronization for an uplink resource provided by the primary cell is in synchronization; determine that the network access procedure with the secondary cell is unsuccessful; and release the uplink resource provided by the primary cell.
  • the apparatus may include instructions executable by the processor to retrigger the UE initiated access procedure with the primary cell.
  • the apparatus may include instructions executable by the processor to: determine that a preamble message of the UE initiated access procedure with the primary cell is unsuccessful; and perform the network initiated access procedure with the secondary cell.
  • the apparatus may include instructions executable by the processor to: hold a scheduling request message for the primary cell to start the UE initiated access procedure; release the scheduling request message for the primary cell if the network initiated access procedure is unsuccessful; and cancel the scheduling request message for the primary cell if the network initiated access procedure is successful.
  • an apparatus for wireless communication may include: means for determining that a user equipment (UE) initiated access procedure with a first cell has been triggered; means for determining that a network initiated access procedure is in progress with a second cell; and means for canceling the UE initiated access procedure with the first cell based at least in part on the network initiated access procedure with the second cell.
  • UE user equipment
  • the first cell is a primary cell and the second cell is a secondary cell, the first cell and the second cell belonging to a same timing advance group.
  • the apparatus may include means for completing the network initiated access procedure with the secondary cell.
  • the apparatus may include means for synchronizing with the primary cell and the secondary cell based at least in part on the network initiated access procedure with the secondary cell.
  • the apparatus may include: means for determining that a timing synchronization for an uplink resource provided by the primary cell is out of synchronization; means for determining that the network access procedure with the secondary cell is successful; and means for synchronizing the timing synchronization for the uplink resources provided by the primary cell based at least in part on the network initiated access procedure with the secondary cell.
  • the uplink resource may be at least one of a physical uplink control channel, or a physical uplink shared channel, or a combination thereof.
  • the apparatus may include: means for determining that a timing synchronization for an uplink resource provided by the primary cell is in synchronization; means for determining that the network access procedure with the secondary cell is unsuccessful; and means for releasing the uplink resource provided by the primary cell.
  • the apparatus may include means for retriggering the UE initiated access procedure with the primary cell.
  • the apparatus may include: means for determining that a preamble message of the UE initiated access procedure with the primary cell is unsuccessful; and means for performing the network initiated access procedure with the secondary cell.
  • the apparatus may include: means for holding a scheduling request message for the primary cell to start the UE initiated access procedure; means for releasing the scheduling request message for the primary cell if the network initiated access procedure is unsuccessful; and means for canceling the scheduling request message for the primary cell if the network initiated access procedure is successful.
  • a non-transitory computer-readable medium storing computer-executable code for wireless communication.
  • the code executable by a processor to: determine that a user equipment (UE) initiated access procedure with a first cell has been triggered; determine that a network initiated access procedure is in progress with a second cell; and cancel the UE initiated access procedure with the first cell based at least in part on the network initiated access procedure with the second cell.
  • UE user equipment
  • FIG. 1 shows a block diagram of a wireless communication system, in accordance with various aspects of the present disclosure
  • FIG. 2 illustrates an example of wireless communications between a user equipment, a first cell, and a second cell, in accordance with various aspects of the present disclosure
  • FIG. 3 illustrates another example of wireless communications between a user equipment, a first cell, and a second cell, in accordance with various aspects of the present disclosure
  • FIG. 4 illustrates another example of wireless communications between a user equipment, a first cell, and a second cell, in accordance with various aspects of the present disclosure
  • FIG. 5 shows a block diagram of a device configured for use in wireless communication, in accordance with various aspects of the present disclosure
  • FIG. 6 shows a block diagram of a device configured for use in wireless communication, in accordance with various aspects of the present disclosure
  • FIG. 7 shows a block diagram of a wireless communication system, in accordance with various aspects of the present disclosure.
  • FIG. 8 is a flow chart illustrating an example of a method for wireless communication, in accordance with various aspects of the present disclosure
  • FIG. 9 is a flow chart illustrating another example of a method for wireless communication, in accordance with various aspects of the present disclosure.
  • FIG. 10 is a flow chart illustrating another example of a method for wireless communication, in accordance with various aspects of the present disclosure.
  • an access procedure (also referred to as a random access procedure or RACH) provides a mechanism for a UE to access resources of a cell, e.g., timing synchronization, channel or frequency resources, etc.
  • RACH random access procedure
  • a UE When a UE is turned on or awakesfrom an idle state, it may not have assigned resources for communicating. To obtain resources, the UE will typically start a random access procedure with its serving cell (primary cell in a CA configuration) .
  • the access procedure typically involves the UE sending a preamble message that includes a randomly selected preamble sequence and identification information for the UE (e.g., radio network temporary identity (RNTI) ) .
  • the cell responds with a random access response that includes timing information for synchronization, a temporary grant of resources, etc.
  • the UE responds with a connection request message to ask for an active radio resource control (RRC) connection for communicating with the cell using various channels.
  • RRC radio resource control
  • the UE may rely on its primary cell to receive network access stratum (NAS) information, security information, etc., and therefore typically initiate an access procedure with the primary cell.
  • the network may assign one or more secondary cells to communicate with the UE where the UE accesses the secondary cell using dedicated RRC signaling.
  • the network may page the UE during a RRC idle mode directing it to connect to the secondary cell and the UE may respond by performing an access procedure with the secondary cell using the dedicated RRC signaling.
  • the dedicated RRC signaling may be part of the random access procedure corresponding to the connection request message exchange.
  • the access procedure with the secondary cell is contention free and therefore can be completed faster than a contention based access procedure with the primary cell.
  • the present description generally relates to one or more improved systems, methods, apparatuses, or computer-readable media for wireless communication by a UE.
  • the described techniques provide for the UE involved in an access procedure with a secondary cell, but receives data in its data buffer that typically triggers an access procedure with a primary cell, to give preference to the faster contention free access procedure with the secondary cell.
  • the UE may determine that a UE initiated access procedure with a first cell (e.g., the primary cell) has been triggered by receiving data in a data buffer, for example.
  • the UE may determine that a network initiated access procedure is being performed with a second cell (e.g., a secondary cell) .
  • the UE may cancel or pause the UE initiated access procedure with the first cell based on the network initiated access procedure with the second cell.
  • the UE may leverage the faster network initiated access procedure to obtain timing synchronization, communication resources, and the like.
  • FIG. 1 illustrates an example of a wireless communications system 100 in accordance with various aspects of the disclosure.
  • the wireless communications system 100 includes base stations 105, UEs 115, and a core network 130.
  • the core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions.
  • IP Internet Protocol
  • the base stations 105 interface with the core network 130 through backhaul links 132 (e.g., S1, etc. ) and may perform radio configuration and scheduling for communication with the UEs 115, or may operate under the control of a base station controller (not shown) .
  • backhaul links 132 e.g., S1, etc.
  • the base stations 105 may communicate, either directly or indirectly (e.g., through core network 130) , with each other over backhaul links 134 (e.g., X1, etc. ) , which may be wired or wireless communication links.
  • backhaul links 134 e.g., X1, etc.
  • the base stations 105 may wirelessly communicate with the UEs 115 via one or more base station antennas. Each of the base station 105 sites may provide communication coverage for a respective geographic coverage area 110.
  • base stations 105 may be referred to as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, eNodeB (eNB) , Home NodeB, a Home eNodeB, or some other suitable terminology.
  • the geographic coverage area 110 for a base station 105 may be divided into sectors making up only a portion of the coverage area (not shown) .
  • the wireless communications system 100 may include base stations 105 of different types (e.g., macro and/or small cell base stations) . There may be overlapping geographic coverage areas 110 for different technologies.
  • the wireless communications system 100 is an LTE/LTE-A network.
  • the term evolved Node B (eNB) may be generally used to describe the base stations 105, while the term UE may be generally used to describe the UEs 115.
  • the wireless communications system 100 may be a Heterogeneous LTE/LTE-A network in which different types of eNBs provide coverage for various geographical regions. For example, each eNB or base station 105 may provide communication coverage for a macro cell, a small cell, and/or other types of cell.
  • cell is a 3GPP term that can be used to describe a base station, a carrier or component carrier associated with a base station, or a coverage area (e.g., sector, etc. ) of a carrier or base station, depending on context.
  • a macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a small cell is a lower-powered base station, as compared with a macro cell, that may operate in the same or different (e.g., licensed, unlicensed, etc. ) frequency bands as macro cells.
  • Small cells may include pico cells, femto cells, and micro cells according to various examples.
  • a pico cell may cover a relatively smaller geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a femto cell also may cover a relatively small geographic area (e.g., a home) and may provide restricted access by UEs having an association with the femto cell (e.g., UEs in a closed subscriber group (CSG) , UEs for users in the home, and the like) .
  • An eNB for a macro cell may be referred to as a macro eNB.
  • An eNB for a small cell may be referred to as a small cell eNB, a pico eNB, a femto eNB or a home eNB.
  • An eNB may support one or multiple (e.g., two, three, four, and the like) cells (e.g., component carriers) .
  • the wireless communications system 100 may support synchronous or asynchronous operation.
  • the base stations may have similar frame timing, and transmissions from different base stations may be approximately aligned in time.
  • the base stations may have different frame timing, and transmissions from different base stations may not be aligned in time.
  • the techniques described herein may be used for either synchronous or asynchronous operations.
  • the communication networks may be packet-based networks that operate according to a layered protocol stack.
  • PDCP Packet Data Convergence Protocol
  • a Radio Link Control (RLC) layer may perform packet segmentation and reassembly to communicate over logical channels.
  • RLC Radio Link Control
  • a Medium Access Control (MAC) layer may perform priority handling and multiplexing of logical channels into transport channels.
  • the MAC layer may also use Hybrid ARQ (HARQ) to provide retransmission at the MAC layer to improve link efficiency.
  • HARQ Hybrid ARQ
  • the Radio Resource Control (RRC) protocol layer may provide establishment, configuration, and maintenance of an RRC connection between a UE 115 and the base stations 105 or core network 130 supporting radio bearers for the user plane data.
  • RRC Radio Resource Control
  • the transport channels may be mapped to Physical channels.
  • the UEs 115 are dispersed throughout the wireless communications system 100, and each UE 115 may be stationary or mobile.
  • a UE 115 may also include or be referred to by those skilled in the art as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.
  • a UE 115 may be a cellular phone, a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a wireless local loop (WLL) station, or the like.
  • PDA personal digital assistant
  • a UE may be able to communicate with various types of base stations and network equipment including macro eNBs, small cell eNBs, relay base stations, and the like.
  • the communication links 125 shown in wireless communications system 100 may include uplink (UL) transmissions from a UE 115 to a base station 105, and/or downlink (DL) transmissions, from a base station 105 to a UE 115.
  • the downlink transmissions may also be called forward link transmissions while the uplink transmissions may also be called reverse link transmissions.
  • Each communication link 125 may include one or more carriers, where each carrier may be a signal made up of multiple sub-carriers (e.g., waveform signals of different frequencies) modulated according to the various radio technologies described above.
  • Each modulated signal may be sent on a different sub-carrier and may carry control information (e.g., reference signals, control channels, etc. ) , overhead information, user data, etc.
  • the communication links 125 may transmit bidirectional communications using FDD (e.g., using paired spectrum resources) or TDD operation (e.g., using unpaired spectrum resources) .
  • FDD e.g., using paired spectrum resources
  • TDD operation e.g., using unpaired spectrum resources
  • Frame structures for FDD e.g., frame structure type 1
  • TDD e.g., frame structure type 2
  • base stations 105 and/or UEs 115 may include multiple antennas for employing antenna diversity schemes to improve communication quality and reliability between base stations 105 and UEs 115. Additionally or alternatively, base stations 105 and/or UEs 115 may employ multiple-input, multiple-output (MIMO) techniques that may take advantage of multi-path environments to transmit multiple spatial layers carrying the same or different coded data.
  • MIMO multiple-input, multiple-output
  • Wireless communications system 100 may support operation on multiple cells or carriers, a feature which may be referred to as carrier aggregation (CA) or multi-carrier operation.
  • a carrier may also be referred to as a component carrier (CC) , a layer, a channel, etc.
  • CC component carrier
  • the terms “carrier, ” “component carrier, ” “cell, ” and “channel” may be used interchangeably herein, based on the associated context.
  • a UE 115 may be configured with multiple downlink CCs and one or more uplink CCs for carrier aggregation.
  • Carrier aggregation may be used with both FDD and TDD component carriers.
  • a UE 115 configured for CA communications may be assigned to communicate via a primary cell (e.g., a first base station 105) and one or more secondary cells (e.g., a second base station 105) .
  • the UE 115 generally uses resources of the primary cell and the secondary cell for CA communications, e.g., a physical downlink control channel (PDCCH) , a physical downlink shared channel (PDSCH) , physical uplink shared channel (PUSCH) , or combinations thereof.
  • PDCCH physical downlink control channel
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • a UE initiated access procedure with the primary cell may be triggered while the UE is involved in a network initiated access procedure with the secondary cell.
  • the secondary access procedure may be contention free and therefore faster than the contention based access procedure with the primary cell. Accordingly, the UE 115 may cancel, pause, etc., the UE initiated access procedure and complete the network initiated access procedure with the secondary cell. Through the secondary cell access procedure, the UE 115 may obtain timing synchronization, communication resource assignment, and the like.
  • FIG. 2 is a message flow diagram 200 illustrating aspects of access procedures in wireless communications, in accordance with various aspects of the present disclosure.
  • the diagram 200 may illustrate aspects of the system 100 described with reference to FIG. 1.
  • the diagram 200 includes a UE 205, a first cell 210, and a second cell 215.
  • the first cell 210 and/or the second cell 215 may be examples of a base station 105 described with respect to FIG. 1.
  • the UE 205 may be an example of a UE 115 described with respect to FIG. 1.
  • the flow diagram 200 illustrates aspects of preferences in access procedure design in wireless communication systems.
  • a system device such as one of the UEs 115 or base stations 105 may execute a set of codes to control the functional elements of the device to perform some or all of the functions described below.
  • the first cell 210 may be a primary cell for the UE 205 and the second cell 215 may be a secondary cell.
  • the UE 205 may determine that a UE initiated access procedure 225 has been triggered with the first cell 210.
  • the UE 205 may not have an active RRC connection with the first cell 210 and may initiate the access procedure to acquire uplink resources.
  • the UE 205 may have an active RRC connection with the first cell 210 but may have lost timing synchronization due to mobility, for example.
  • the UE initiated access procedure with the first cell 210 may have been triggered by the UE receiving data in its data buffer for communication. For example, a user of the UE 205 may have opened a web browser to access the internet, opened an application for exchanging data, etc.
  • the UE 205 would initiate the access procedure 225 with the first cell 210 bysending a preamble message, as discussed above.
  • the UE 205 may determine that it has a network initiated access procedure 235 already in progress (or is about to begin) with the second cell 215. For example, the network may have caused the second cell 215 to send a paging message to page the UE 205 to initiate the access procedure 235.
  • the access procedure 235 with the second cell 215 may be in progress and one or more of the preamble message (Msg1) , the random access response (Msg2) , and/or the connection request message (Msg3) may have been exchanged with the second cell 215.
  • Msg1 preamble message
  • Msg2 random access response
  • Msg3 connection request message
  • the UE 205 may cancel the UE initiated access procedure 225 with the first cell 210 based on the network initiated access procedure 235 with the second cell 215. For example, the UE 205 may determine that the network initiated access procedure 235 is a contention free access procedure, that the first cell 210 and the second cell 215 belong to a same timing advance group, that one or more aspects of the UE initiated access procedure 225 has been unsuccessful, and the like. Accordingly, the UE 205 may give preference to the access procedure 235 with the second cell 215 and cancel, pause, postpone, etc., the access procedure 225 with the first cell 210.
  • FIG. 3 is a message flow diagram 300 illustrating aspects of access procedures in wireless communications, in accordance with various aspects of the present disclosure.
  • the diagram 300 may illustrate aspects of the system 100 described with reference to FIG. 1.
  • the diagram 300 includes a UE 305, a first cell 310, and a second cell 315.
  • the first cell 310 and/or the second cell 315 may be examples of a base station 105 described with respect to FIG. 1.
  • the UE 305 may be an example of a UE 115 described with respect to FIG. 1.
  • the flow diagram 300 illustrates aspects of preferences in access procedure design in wireless communication systems.
  • a system device such as one of the UEs 115 or base stations 105 may execute a set of codes to control the functional elements of the device to perform some or all of the functions described below.
  • the first cell 310 may be a primary cell for the UE 305 and the second cell 315 may be a secondary cell for the UE 305.
  • the UE 305 may determine that a UE initiated access procedure 325 has been triggered with the first cell 310.
  • the UE 305 may not have an active RRC connection with the first cell 310 and therefore need to initiate the access procedure to acquire uplink resources.
  • the UE 305 may have an active RRC connection with the first cell 310 but may have lost timing synchronization due to mobility, for example.
  • the UE initiated access procedure with the first cell 310 may have been triggered by the UE receiving data in its data buffer for communication. For example, a user of the UE 305 may have opened a web browser to access the internet, opened an application for exchanging data, etc.
  • the UE 305 would initiate the access procedure 325 with the first cell 310 by sending a preamble message, as discussed above.
  • the UE 305 may determine that it has a network initiated access procedure 335 with the second cell 315 in progress. For example, the network may have caused the second cell 315 to send a paging message to page the UE 305 to initiate the access procedure 335.
  • the access procedure 335 with the second cell 315 may be in progress and one or more of the preamble message (Msg1) , the random access response (Msg2) , and/or the connection request message (Msg3) may have been exchanged with the second cell 315.
  • Msg1 the preamble message
  • Msg2 random access response
  • Msg3 connection request message
  • the UE 305 may cancel the UE initiated access procedure 325 with the first cell 310 based on the network initiated access procedure 335 with the second cell 315. For example, the UE 305 may determine that the network initiated access procedure 335 is a contention free access procedure, that the first cell 310 and the second cell 315 belong to a same timing advance group, that one or more aspects of the UE initiated access procedure 325 has been unsuccessful, and the like. Accordingly, the UE 305 may give preference to the access procedure 335 with the second cell 315 and cancel, pause, postpone, etc., the access procedure 325 with the first cell 310.
  • the UE 305 may complete the network initiated access procedure 350 (e.g., the completion of access procedure 335) with the second cell 315.
  • the UE 305 and the second cell 315 may exchange Msg1, Msg2, Msg3, etc., during the access procedure 350 such that one or more resources, information, and the like are obtained from the second cell 315.
  • the first cell 310 and the second cell 315 may belong to the same timing advance group and therefore share a common system timing. Therefore, by completing the access procedure 350 with the second cell 315, the UE 305 may be time synchronized with the second cell 315 and the first cell 310. Accordingly and at block 355, the UE 305 may synchronize one or more of its timing sources, clocks, counters, etc., to the shared timing synchronization of the first cell 310 and the second cell 315.
  • FIG. 4 is a message flow diagram 400 illustrating aspects of access procedures in wireless communications, in accordance with various aspects of the present disclosure.
  • the diagram 400 may illustrate aspects of the system 100 described with reference to FIG. 1.
  • the diagram 400 includes a UE 405, a first cell 410, and a second cell 415.
  • the first cell 410 and/or the second cell 415 may be examples of a base station 105 described with respect to FIG. 1.
  • the UE 405 may be an example of a UE 115 described with respect to FIG. 1.
  • the flow diagram 400 illustrates aspects of preferences in access procedure design in wireless communication systems.
  • a system device such as one of the UEs 115 or base stations 105 may execute a set of codes to control the functional elements of the device to perform some or all of the functions described below.
  • the first cell 410 may be a primary cell for the UE 405 and the second cell 415 may be a secondary cell for the UE 405.
  • the UE 405 may determine that it has a network initiated access procedure 425 with the second cell 415 in progress. For example, the network may have caused the second cell 415 to send a paging message to page the UE 405 to initiate the access procedure 425.
  • the access procedure 425 with the second cell 415 may be in progress and one or more of the preamble message (Msg1) , the random access response (Msg2) , and/or the connection request message (Msg3) may have been exchanged with the second cell 415.
  • the network initiated access procedure 425 with the second cell 415 may not have been completed though.
  • the UE 405 may determine that a UE initiated access procedure has been triggered with the first cell 410.
  • the UE 405 may have active RRC connection with the first cell 410 and may be timing synchronized with the first cell 410.
  • the UE initiated access procedure with the first cell 410 may have been triggered by the UE receiving data in its data buffer for communication.
  • the UE 405 would initiate the access procedure with the first cell 410 and send a scheduling request message.
  • the scheduling request message may request the resources to communicate the data that triggered the UE initiated access procedure with the first cell 410.
  • the UE 405 may hold, pause, delay, etc., the scheduling request message for the UE initiated access procedure with the first cell 410. For instance, the UE 405 may determine that the network initiated access procedure 425 with the second cell 415 is a contention free procedure and therefore may be able to provide any needed resources faster than an access procedures with the first cell 410. In some examples, the UE 405 may start a timer, counter, etc., associated with holding the scheduling request message. The timer may provide an opportunity for the access procedure 425 with the second cell 415 to be completed. For example, the timer may have a predetermined time periods based on a time associated with completing a contention free access procedure.
  • the UE 405 may determine that the access procedure 425 with the second cell 415 has failed and therefore release the scheduling request message to initiate the access procedure 445 with the first cell 410. That is, the UE 405 may determine that it is unable to complete the access procedure 425 with the second cell 415 for any number of reasons and, therefore, turn to the access procedure 445 with the first cell 410 to acquire uplink resources, timing synchronization, etc.
  • the UE 405 may determine that the network initiated access procedure 425 with the second cell 415 has been successful and therefore cancel the scheduling request message to the first cell 410. That is, the UE 405 may determine that the uplink resources, timing synchronization, etc., needed to communicate the data that triggered the UE initiated access procedure can be or has been obtained via the network initiated access procedure 425 with the second cell 415.
  • FIG. 5 shows a block diagram 500 of a device 505 for use in wireless communication, in accordance with various aspects of the present disclosure.
  • the device 505 may be an example of one or more aspects of a UE described with reference to FIGs. 1-4.
  • the device 505 may include a receiver 510, an access procedure (random access procedure (RACH) ) 515, and/or a transmitter 520.
  • RACH random access procedure
  • the device 505 may also be or include a processor (not shown) . Each of these modules may be in communication with each other.
  • the components of the device 505 may, individually or collectively, be implemented using one or more application-specific integrated circuits (ASICs) adapted to perform some or all of the applicable functions in hardware.
  • ASICs application-specific integrated circuits
  • the functions may be performed by one or more other processing units (or cores) , on one or more integrated circuits.
  • other types of integrated circuits may be used (e.g., Structured/Platform ASICs, Field Programmable Gate Arrays (FPGAs) , and other Semi-Custom ICs) , which may be programmed in any manner known in the art.
  • the functions of each module may also be implemented, in whole or in part, with instructions embodied in a memory, formatted to be executed by one or more general or application-specific processors.
  • the receiver 510 may receive information such as packets, user data, and/or control information associated with various information channels (e.g., control channels, data channels, etc. ) .
  • the receiver 510 may be configured to receive one or more messages associated with access procedures with a first primary cell and with a second secondary cell. Information may be passed on to the access procedure manager 515, and to other components of the device 505.
  • the access procedure manager 515 may monitor, control, or otherwise manage aspects of one or more access procedures for the device 505. For example, the access procedure manager 515 may determine that aspects of the device 505 has triggered a UE initiated (or device initiated in the instant context) access procedure with a first cell (e.g., a primary cell) .
  • the access procedure with the first cell may be triggered by the device 505 determining that it has data or information to communicate or to request. For example, a user of the device 505 may open a web browser, start an application, or otherwise initiate an action on the device 505 that may require the device 505 to access one or more wireless resources.
  • the access procedure with the first cell may be a contention based access procedure.
  • the access procedure manager 515 may determine that an access procedure with a second cell (e.g., a secondary cell) is ongoing or in progress.
  • the access procedure with the second cell may be triggered by a network entity, e.g., a mobility management entity, a server entity, etc. Accordingly, the network may send a paging message to the device 505 directing it to start an access procedure with the second cell.
  • the access procedure with the second cell may be a contention free access procedure.
  • the access procedure manager 515 may cancel the UE initiated access procedure with the first cell based on the network initiated access procedure with the second cell. For example, the access procedure manager 515 may determine that the network initiated access procedure is faster than the UE initiated access procedure (contention free v. contention based) and therefore give preference to the network initiated access procedure.
  • the first and second cells may belong to the same timing advance group and the access procedure manager 515 may synchronize one or more clocks or timing signals for the device 505 for the first and second cells based on the network initiated access procedure with the second cell.
  • the transmitter 520 may transmit the one or more signals received from other components of the device 505.
  • the transmitter 520 may transmit one or more messages to a first cell, a second cell, or both cells, associated with access procedures for the cells.
  • the transmitter 520 may be collocated with the receiver 510 in a transceiver module.
  • FIG. 6 shows a block diagram 600 of a device 505-a for use in wireless communication, in accordance with various examples.
  • the device 505-a may be an example of one or more aspects of a UE described with reference to FIGs. 1-4. It may also be an example of a device 505 described with reference to FIG. 5.
  • the device 505-a may include a receiver 510-a, an access procedure manager 515-a, and/or a transmitter 520-a, which may be examples of the corresponding modules of device 505.
  • the device 505-a may also include a processor (not shown) . Each of these components may be in communication with each other.
  • the access procedure manager 515-a may include a UE initiated access procedure manager 605, a network initiated access procedure manager, and/or an access procedure controller.
  • the receiver 510-a and the transmitter 520-a may perform the functions of the receiver 510 and the transmitter 520, of FIG. 5, respectively.
  • the UE initiated access procedure manager 605 may monitor, control, or otherwise manage aspects of a UE initiated access procedure with a first cell for the device 505-a. For example, the UE initiated access procedure manager 605 may determine that a UE initiated access procedure with the first cell has been triggered.
  • the first cell may be a primary cell.
  • the UE initiated access procedure manager 605 may determine whether a timing synchronization for an uplink resource provided by the first cell is synchronized or out of synchronization.
  • the device 505-a may have an active RRC connection with the first cell and assigned uplink resource (s) , e.g., a PUCCH resource, a PUSCH, and the like.
  • the device 505-a may be out of sync with the first cell due to mobility, for example.
  • the UE initiated access procedure manager 605 may determine a status or failure condition for the access procedure with the first cell. For example, the UE initiated access procedure manager 605 may determine whether one or more of the Msg1, the Msg2, and/or the Msg3 exchanges associated with the first cell access procedure has been successfully transmitted or received.
  • the network initiated access procedure manager 610 may monitor, control, or otherwise manage aspects of a network initiated access procedure with a second cell for the device 505-a. For example, the network initiated access procedure may determine that a network initiated access procedure with the second cell is in progress or otherwise ongoing.
  • the second cell may be a secondary cell.
  • the first cell and the second cell may belong to the same timing advance group. Accordingly, the first cell and the second cell may share a common signal timing synchronization.
  • the network initiated access procedure manager 610 may determine a status and/or failure condition of the network initiated access procedure with the second cell. For example, the network initiated access procedure manager 610 determine at which step of the access procedure the device 505-a and the second cell are currently at, whether one or more of the steps of the access procedure has been unsuccessful, and the like. Accordingly, the network initiated access procedure manager 610 may output information to one or more other modules or components of the device 505-a indicative of such status or failure condition.
  • the network initiated access procedure may be triggered based on the device 505-a receiving a paging message from the network entity, via a cell.
  • the device 505-a may perform an access procedure with the second cell to access one or more component carriers of the second cell for CA communications.
  • the access procedure controller 615 may monitor, control, or otherwise manageaspects of a UE initiated access procedure with a first cell and/or a network initiated access procedure with a second cell for the device 505-a. For example, the access procedure controller 615 may, alone or in cooperation with the UE initiated access procedure manager 605, cancel the UE initiated access procedure with the first cell based on the network access procedure with the second cell.
  • the access procedure controller 615 may, alone or in cooperation with the UE initiated access procedure manager 605 and/or the network initiated access procedure manager 610, determine to complete the access procedure with the second cell. For example, the access procedure controller 615 may cancel the UE initiated access procedure and provide for the network initiated access procedure to continue to completion.
  • the access procedure controller 615 may, alone or in cooperation with the UE initiated access procedure manager 605 and/or the network initiated access procedure manager 610, synchronize with the first cell and the second cell based on the network initiated access procedure with the second cell.
  • the first and second cells may belong to the same timing advance group. Accordingly, the device 505-a may acquire the shared timing reference synchronization for the first cell by completing the access procedure with the second cell.
  • the access procedure controller 615 may, alone or in cooperation with the UE initiated access procedure manager 605 and/or the network initiated access procedure manager 610, determine that a timing synchronization for an uplink resource provided by the first cell is out of sync, that the network initiated access procedure with the second cell has been successful, and therefore synchronize the timing synchronization for the uplink resource provided by the first cell based on the network initiated access procedure with the second cell.
  • the device 505-a may have an PUSCH resource assigned by the first cell but have become out of synchronization with the first cell.
  • the access procedure controller 615 may utilize the timing synchronization signal obtained during the access procedure with the second cell to synchronize with the timing for the first cell. This may permit the device 505-a to continue to access the assigned uplink resource.
  • the access procedure controller 615 may, alone or in cooperation with the UE initiated access procedure manager 605 and/or the network initiated access procedure manager 610, retrigger the UE initiated access procedure with the first cell based on a determination that the network initiated access procedure with the second cell has been unsuccessful.
  • the access procedure controller 615 may, alone or in cooperation with the UE initiated access procedure manager 605 and/or the network initiated access procedure manager 610, manage aspects of a scheduling request message for the device 505-a. For example, the access procedure controller 615 may hold a scheduling request message for the first cell to start the UE initiated access procedure. The access procedure controller 615 may release the scheduling request message if the network initiated access procedure is unsuccessful or cancel the scheduling request message if the network initiated access procedure is successful. Accordingly, the access procedure controller 615 may utilize the scheduling request message aspects of the UE initiated access procedure to pause or delay the UE initiated access procedure pending the outcome of the network initiated access procedure.
  • FIG. 7 shows a system 700 for use in wireless communication, in accordance with various examples.
  • System 700 may include a UE 115-a, which may be an example of the UEs of FIGs. 1-4.
  • UE 115-a may also be an example of one or more aspects of devices 505 of FIGs. 5 and 6.
  • the UE 115-a may generally include components for bi-directional voice and data communications including components for transmitting communications and components for receiving communications.
  • the UE 115-a may include antenna (s) 740, a transceiver 735, a processor 705, and memory 715 (including software (SW) 720) , which each may communicate, directly or indirectly, with each other (e.g., via one or more buses 745) .
  • the transceiver 735 may be configured to communicate bi-directionally, via the antenna (s) 740 and/or one or more wired or wireless links, with one or more networks, as described above.
  • the transceiver 735 may be configured to communicate bi-directionally with base stations 105 or cells with reference to FIGs. 1-4.
  • the transceiver 735 may include a modem configured to modulate the packets and provide the modulated packets to the antenna (s) 740 for transmission, and to demodulate packets received from the antenna (s) 740. While the UE 115-a may include a single antenna 740, the UE 115-a may have multiple antennas 740 capable of concurrently transmitting and/or receiving multiple wireless transmissions. The transceiver 735 may be capable of concurrently communicating with one or more base stations 105 via multiple component carriers.
  • the UE 115-a may include an access procedure manager 515-b, which may perform the functions described above for the access procedure manager 515 of device 505 of FIGs. 5 and 6.
  • the UE 115-a may also include a synchronization manager 725 that may monitor, control, or otherwise manage timing synchronization for the device 505-a.
  • the synchronization manager 725 may determine whether a timing synchronization for uplink resources from the first cell is in sync.
  • the synchronization manager 725 may also manage aspects of timing synchronization for the first cell based on the network initiated access procedure with the second cell.
  • the memory 715 may include random access memory (RAM) and read-only memory (ROM) .
  • the memory 715 may store computer-readable, computer-executable software/firmware code 720 containing instructions that are configured to, when executed, cause the processor module 905 to perform various functions described herein (e.g., perform access procedures with the first cell, the second cell, or both cells, etc. ) .
  • the computer-readable, computer-executable software/firmware code 720 may not be directly executable by the processor 705 but be configured to cause a computer (e.g., when compiled and executed) to perform functions described herein.
  • the processor 705 may include an intelligent hardware device, e.g., a central processing unit (CPU) , a microcontroller, an application-specific integrated circuit (ASIC) , etc.
  • CPU central processing unit
  • ASIC application-specific integrated circuit
  • FIG. 8 is a flow chart illustrating an example of a method 800 for wireless communication, in accordance with various aspects of the present disclosure.
  • the method 800 is described below with reference to aspects of one or more of the UEs 115 described with reference to FIGs. 1-4 and 7, and/or aspects of one or more of the devices 505 described with reference to FIGs. 5 and 6.
  • a UE may execute one or more sets of codes to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may perform one or more of the functions described below using special-purpose hardware.
  • the method 800 may include the UE determining that a UE initiated access procedure with a first cell has been triggered.
  • the UE initiated access procedure may be triggered by the UE determining that it has data to communicate.
  • the first cell may be a primary cell for the UE, where the UE is configured to communicate with one or more secondary cells for CA communications.
  • the method 800 may include the UE determining that a network initiated access procedure is in progress with a second cell.
  • the second cell may be a secondary cell for the UE.
  • the network initiated access procedure with the second cell may include one or more dedicated RRC signaling messages.
  • the first cell and the second cell may belong to the same timing advance group.
  • the method 800 may include the UE canceling the UE initiated access procedure with the first cell based on the network initiated access procedure with the second cell.
  • the network initiated access procedure may be a contention free access procedure where the UE initiated access procedure may be a contention based access procedure.
  • canceling the UE initiated access procedure with the first cell may include delaying the UE initiated access procedure with the first cell pending a successful outcome of the network initiated access procedure with the second cell. If the network initiated access procedure with the second cell is unsuccessful, the UE initiated access procedure with the first cell may be permitted to continue and/or may be retriggered. Accordingly, the UE may give preference to a network initiated contention free access procedure and yet still obtain timing synchronization with the first cell through the network initiated access procedure with the second cell.
  • the operation (s) at block 805, 810, and/or 815 may be performed using the access procedure manager 515 described with reference to FIGs. 5-7.
  • the method 800 may provide for wireless communication. It should be noted that the method 800 is just one implementation and that the operations of the method 800 may be rearranged or otherwise modified such that other implementations are possible.
  • FIG. 9 is a flow chart illustrating an example of a method 900 for wireless communication, in accordance with various aspects of the present disclosure.
  • the method 900 is described below with reference to aspects of one or more of the UEs 115 described with reference to FIGs. 1-4 and 7, and/or aspects of one or more of the devices 505 described with reference to FIGs. 5 and 6.
  • a UE may execute one or more sets of codes to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may perform one or more of the functions described below using special-purpose hardware.
  • the method 900 may include the UE determining that a UE initiated access procedure with a primary cell has been triggered.
  • the UE initiated access procedure may be triggered by the UE determining that it has data to communicate.
  • the method 900 may include the UE determining that a network initiated access procedure is in progress with a secondary cell.
  • the network initiated access procedure with the secondary cell may include one or more dedicated RRC signaling messages.
  • the primary cell and the secondary cell may belong to the same timing advance group.
  • the method 900 may include the UE canceling the UE initiated access procedure with the primary cell based on the network initiated access procedure with the secondary cell.
  • the network initiated access procedure may be a contention free access procedure where the UE initiated access procedure may be a contention based access procedure. Accordingly, the UE may give preference to a network initiated contention free access procedure and yet still obtain timing synchronization with the primary cell through the network initiated access procedure with the secondary cell.
  • the method 900 may include the UE determining that a timing synchronization for an uplink resource provided by the primary cell is out of synchronization.
  • the uplink resource may include a PUCCH resource, a PUSCH resource, and the like.
  • the timing may be out of synchronization due to mobility of the UE, for example. Accordingly, even though the UE may have the uplink resource provided by the primary cell, it would be unable to use the resource due to the timing out-of-sync condition.
  • the method 900 may include the UE determining that the network initiated access procedure with the secondary cell is successful.
  • the UE may obtain from the secondary cell through the access procedure, a common timing reference synchronization of the secondary cell, which is also in sync with the primary cell that belongs to the same timing advance group as the secondary cell.
  • the method 900 may include the UE synchronizing the timing synchronization for the uplink resource provided by the primary cell based on the network initiated access procedure with the secondary cell. For example, the UE may rely on the timing synchronization signaling exchanged during the network initiated access procedure with the secondary cell to synchronize the timing of the uplink resource provided by the primary cell. Accordingly, the UE may use the uplink resource provided by the primary cell to communicate the data that triggered the UE initiated access procedure with the primary cell.
  • the operation (s) at block 905, 910, 915, 920, 925, and/or 930 may be performed using the access procedure manager 515 described with reference to FIGs. 5-7.
  • the method 900 may provide for wireless communication. It should be noted that the method 900 is just one implementation and that the operations of the method 900 may be rearranged or otherwise modified such that other implementations are possible.
  • FIG. 10 is a flow chart illustrating an example of a method 1000 for wireless communication, in accordance with various aspects of the present disclosure.
  • the method 1000 is described below with reference to aspects of one or more of the UEs 115 described with reference to FIGs. 1-4 and 7, and/or aspects of one or more of the devices 505 described with reference to FIGs. 5 and 6.
  • a UE may execute one or more sets of codes to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may perform one or more of the functions described below using special-purpose hardware.
  • the method 1000 may include the UE determining that a UE initiated access procedure with a primary cell has been triggered.
  • the UE initiated access procedure may be triggered by the UE determining that it has data to communicate.
  • the method 1000 may include the UE determining that a network initiated access procedure is in progress with a secondary cell.
  • the network initiated access procedure with the secondary cell may include one or more dedicated RRC signaling messages.
  • the primary cell and the secondary cell may belong to the same timing advance group.
  • the method 1000 may include the UE canceling the UE initiated access procedure with the primary cell based on the network initiated access procedure with the secondary cell.
  • the network initiated access procedure may be a contention free access procedure where the UE initiated access procedure may be a contention based access procedure. Accordingly, the UE may give preference to a network initiated contention free access procedure and yet still obtain timing synchronization with the primary cell through the network initiated access procedure with the secondary cell.
  • the method 1000 may include the UE determining that a timing synchronization for an uplink resource provided by the primary cell is in synchronization.
  • the uplink resource may include a PUCCH resource, a PUSCH resource, and the like.
  • the timing may be in synchronization due to the UE previously performing an access procedure with the primary cell to obtain timing synchronization signaling and to request the uplink resource.
  • the method 1000 may include the UE determining that the network initiated access procedure with the secondary cell is unsuccessful. Accordingly, the UE was not able to obtain from the secondary cell a common timing reference synchronization of the secondary cell.
  • the method 1000 may include the UE releasing the uplink resource provided by the primary cell.
  • the UE may release the resource in order to retrigger the UE initiated access procedure with the primary cell to obtain another uplink resource, e.g., an uplink resource assigned for more transmissions, a semi-persistent resource assignment, etc.
  • the operation (s) at block 1005, 1010, 1015, 1020, 1025, and/or 1030 may be performed using the access procedure manager 515 described with reference to FIGs. 5-7.
  • the method 1000 may provide for wireless communication. It should be noted that the method 1000 is just one implementation and that the operations of the method 1000 may be rearranged or otherwise modified such that other implementations are possible.
  • aspects from two or more of the methods 800, 900, and/or 1000 may be combined. It should be noted that the methods 800, 900, 1000 are just example implementations, and that the operations of the methods 800-1000 may be rearranged or otherwise modified such that other implementations are possible.
  • a CDMA system may implement a radio technology such as CDMA2000, Universal Terrestrial Radio Access (UTRA) , etc.
  • CDMA2000 covers IS-2000, IS-95, and IS-856 standards.
  • IS-2000 Releases 0 and A are commonly referred to as CDMA2000 1X, 1X, etc.
  • IS-856 (TIA-856) is commonly referred to as CDMA2000 1xEV-DO, High Rate Packet Data (HRPD) , etc.
  • UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA.
  • a TDMA system may implement a radio technology such as Global System for Mobile Communications (GSM) .
  • GSM Global System for Mobile Communications
  • An OFDMA system may implement a radio technology such as Ultra Mobile Broadband (UMB) , Evolved UTRA (E-UTRA) , IEEE 802.11 (WiFi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDM TM , etc.
  • UMB Ultra Mobile Broadband
  • E-UTRA Evolved UTRA
  • WiFi WiFi
  • WiMAX IEEE 802.16
  • IEEE 802.20 Flash-OFDM TM
  • UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS) .
  • 3GPP Long Term Evolution (LTE) and LTE-Advanced (LTE-A) are new releases of UMTS that use E-UTRA.
  • UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization named “3rd Generation Partnership Project” (3GPP) .
  • CDMA2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) .
  • the techniques described herein may be used for the systems and radio technologies mentioned above as well as other systems and radio technologies, including cellular (e.g., LTE) communications over an unlicensed and/or shared bandwidth.
  • LTE Long Term Evolution
  • Information and signals may be represented using any of a variety of different technologies and techniques.
  • data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • the functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope and spirit of the disclosure and appended claims. For example, due to the nature of software, functions described above can be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
  • the term “and/or, ” when used in a list of two or more items means that any one of the listed items can be employed by itself, or any combination of two or more of the listed items can be employed.
  • the composition can contain A alone; B alone; C alone; A and B in combination; A and C in combination; B and C in combination; or A, B, and C in combination.
  • “or” as used in a list of items indicates a disjunctive list such that, for example, a list of “at least one of A, B, or C” means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) .
  • Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a non-transitory storage medium may be any available medium that can be accessed by a general purpose or special purpose computer.
  • non-transitory computer-readable media can comprise RAM, ROM, electrically erasable programmable read only memory (EEPROM) , compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor.
  • RAM random access memory
  • ROM read only memory
  • EEPROM electrically erasable programmable read only memory
  • CD compact disk
  • magnetic disk storage or other magnetic storage devices or any other non-transitory medium that can be used to carry or store desired program code means in the form of instructions or
  • any connection is properly termed a computer-readable medium.
  • the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared, radio, and microwave
  • the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium.
  • Disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD) , floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

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Abstract

L'invention concerne des procédés, des systèmes et des dispositifs associés à des procédures d'accès dans des communications sans fil. Un équipement d'utilisateur (UE) peut déterminer qu'une procédure d'accès initiée par un UE avec une première cellule a été déclenchée. La première cellule peut être une cellule primaire. L'UE peut déterminer qu'une procédure d'accès initiée par un réseau avec une seconde cellule est en cours. La seconde cellule peut être une cellule secondaire. L'UE peut annuler la procédure d'accès initiée par l'UE avec la première cellule, sur la base de la procédure d'accès initiée par le réseau avec la seconde cellule.
PCT/CN2015/073681 2015-03-05 2015-03-05 Procédure d'accès dans des communications sans fil WO2016138656A1 (fr)

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